shithub: lu9-lua

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import 5.4.2 release

--- /dev/null

+++ b/Makefile

@@ -1,0 +1,220 @@

+# Makefile for building Lua

+# See ../doc/readme.html for installation and customization instructions.

+

+# == CHANGE THE SETTINGS BELOW TO SUIT YOUR ENVIRONMENT =======================

+

+# Your platform. See PLATS for possible values.

+PLAT= guess

+

+CC= gcc -std=gnu99

+CFLAGS= -O2 -Wall -Wextra -DLUA_COMPAT_5_3 $(SYSCFLAGS) $(MYCFLAGS)

+LDFLAGS= $(SYSLDFLAGS) $(MYLDFLAGS)

+LIBS= -lm $(SYSLIBS) $(MYLIBS)

+

+AR= ar rcu

+RANLIB= ranlib

+RM= rm -f

+UNAME= uname

+

+SYSCFLAGS=

+SYSLDFLAGS=

+SYSLIBS=

+

+MYCFLAGS=

+MYLDFLAGS=

+MYLIBS=

+MYOBJS=

+

+# Special flags for compiler modules; -Os reduces code size.

+CMCFLAGS= 

+

+# == END OF USER SETTINGS -- NO NEED TO CHANGE ANYTHING BELOW THIS LINE =======

+

+PLATS= guess aix bsd c89 freebsd generic linux linux-readline macosx mingw posix solaris

+

+LUA_A=	liblua.a

+CORE_O=	lapi.o lcode.o lctype.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o lmem.o lobject.o lopcodes.o lparser.o lstate.o lstring.o ltable.o ltm.o lundump.o lvm.o lzio.o

+LIB_O=	lauxlib.o lbaselib.o lcorolib.o ldblib.o liolib.o lmathlib.o loadlib.o loslib.o lstrlib.o ltablib.o lutf8lib.o linit.o

+BASE_O= $(CORE_O) $(LIB_O) $(MYOBJS)

+

+LUA_T=	lua

+LUA_O=	lua.o

+

+LUAC_T=	luac

+LUAC_O=	luac.o

+

+ALL_O= $(BASE_O) $(LUA_O) $(LUAC_O)

+ALL_T= $(LUA_A) $(LUA_T) $(LUAC_T)

+ALL_A= $(LUA_A)

+

+# Targets start here.

+default: $(PLAT)

+

+all:	$(ALL_T)

+

+o:	$(ALL_O)

+

+a:	$(ALL_A)

+

+$(LUA_A): $(BASE_O)

+	$(AR) $@ $(BASE_O)

+	$(RANLIB) $@

+

+$(LUA_T): $(LUA_O) $(LUA_A)

+	$(CC) -o $@ $(LDFLAGS) $(LUA_O) $(LUA_A) $(LIBS)

+

+$(LUAC_T): $(LUAC_O) $(LUA_A)

+	$(CC) -o $@ $(LDFLAGS) $(LUAC_O) $(LUA_A) $(LIBS)

+

+test:

+	./lua -v

+

+clean:

+	$(RM) $(ALL_T) $(ALL_O)

+

+depend:

+	@$(CC) $(CFLAGS) -MM l*.c

+

+echo:

+	@echo "PLAT= $(PLAT)"

+	@echo "CC= $(CC)"

+	@echo "CFLAGS= $(CFLAGS)"

+	@echo "LDFLAGS= $(SYSLDFLAGS)"

+	@echo "LIBS= $(LIBS)"

+	@echo "AR= $(AR)"

+	@echo "RANLIB= $(RANLIB)"

+	@echo "RM= $(RM)"

+	@echo "UNAME= $(UNAME)"

+

+# Convenience targets for popular platforms.

+ALL= all

+

+help:

+	@echo "Do 'make PLATFORM' where PLATFORM is one of these:"

+	@echo "   $(PLATS)"

+	@echo "See doc/readme.html for complete instructions."

+

+guess:

+	@echo Guessing `$(UNAME)`

+	@$(MAKE) `$(UNAME)`

+

+AIX aix:

+	$(MAKE) $(ALL) CC="xlc" CFLAGS="-O2 -DLUA_USE_POSIX -DLUA_USE_DLOPEN" SYSLIBS="-ldl" SYSLDFLAGS="-brtl -bexpall"

+

+bsd:

+	$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_POSIX -DLUA_USE_DLOPEN" SYSLIBS="-Wl,-E"

+

+c89:

+	$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_C89" CC="gcc -std=c89"

+	@echo ''

+	@echo '*** C89 does not guarantee 64-bit integers for Lua.'

+	@echo ''

+

+FreeBSD NetBSD OpenBSD freebsd:

+	$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_LINUX -DLUA_USE_READLINE -I/usr/include/edit" SYSLIBS="-Wl,-E -ledit" CC="cc"

+

+generic: $(ALL)

+

+Linux linux:	linux-noreadline

+

+linux-noreadline:

+	$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_LINUX" SYSLIBS="-Wl,-E -ldl"

+

+linux-readline:

+	$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_LINUX -DLUA_USE_READLINE" SYSLIBS="-Wl,-E -ldl -lreadline"

+

+Darwin macos macosx:

+	$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_MACOSX -DLUA_USE_READLINE" SYSLIBS="-lreadline"

+

+mingw:

+	$(MAKE) "LUA_A=lua54.dll" "LUA_T=lua.exe" \

+	"AR=$(CC) -shared -o" "RANLIB=strip --strip-unneeded" \

+	"SYSCFLAGS=-DLUA_BUILD_AS_DLL" "SYSLIBS=" "SYSLDFLAGS=-s" lua.exe

+	$(MAKE) "LUAC_T=luac.exe" luac.exe

+

+posix:

+	$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_POSIX"

+

+SunOS solaris:

+	$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_POSIX -DLUA_USE_DLOPEN -D_REENTRANT" SYSLIBS="-ldl"

+

+# Targets that do not create files (not all makes understand .PHONY).

+.PHONY: all $(PLATS) help test clean default o a depend echo

+

+# Compiler modules may use special flags.

+llex.o:

+	$(CC) $(CFLAGS) $(CMCFLAGS) -c llex.c

+

+lparser.o:

+	$(CC) $(CFLAGS) $(CMCFLAGS) -c lparser.c

+

+lcode.o:

+	$(CC) $(CFLAGS) $(CMCFLAGS) -c lcode.c

+

+# DO NOT DELETE

+

+lapi.o: lapi.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \

+ lobject.h ltm.h lzio.h lmem.h ldebug.h ldo.h lfunc.h lgc.h lstring.h \

+ ltable.h lundump.h lvm.h

+lauxlib.o: lauxlib.c lprefix.h lua.h luaconf.h lauxlib.h

+lbaselib.o: lbaselib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h

+lcode.o: lcode.c lprefix.h lua.h luaconf.h lcode.h llex.h lobject.h \

+ llimits.h lzio.h lmem.h lopcodes.h lparser.h ldebug.h lstate.h ltm.h \

+ ldo.h lgc.h lstring.h ltable.h lvm.h

+lcorolib.o: lcorolib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h

+lctype.o: lctype.c lprefix.h lctype.h lua.h luaconf.h llimits.h

+ldblib.o: ldblib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h

+ldebug.o: ldebug.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \

+ lobject.h ltm.h lzio.h lmem.h lcode.h llex.h lopcodes.h lparser.h \

+ ldebug.h ldo.h lfunc.h lstring.h lgc.h ltable.h lvm.h

+ldo.o: ldo.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \

+ lobject.h ltm.h lzio.h lmem.h ldebug.h ldo.h lfunc.h lgc.h lopcodes.h \

+ lparser.h lstring.h ltable.h lundump.h lvm.h

+ldump.o: ldump.c lprefix.h lua.h luaconf.h lobject.h llimits.h lstate.h \

+ ltm.h lzio.h lmem.h lundump.h

+lfunc.o: lfunc.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \

+ llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h

+lgc.o: lgc.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \

+ llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h lstring.h ltable.h

+linit.o: linit.c lprefix.h lua.h luaconf.h lualib.h lauxlib.h

+liolib.o: liolib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h

+llex.o: llex.c lprefix.h lua.h luaconf.h lctype.h llimits.h ldebug.h \

+ lstate.h lobject.h ltm.h lzio.h lmem.h ldo.h lgc.h llex.h lparser.h \

+ lstring.h ltable.h

+lmathlib.o: lmathlib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h

+lmem.o: lmem.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \

+ llimits.h ltm.h lzio.h lmem.h ldo.h lgc.h

+loadlib.o: loadlib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h

+lobject.o: lobject.c lprefix.h lua.h luaconf.h lctype.h llimits.h \

+ ldebug.h lstate.h lobject.h ltm.h lzio.h lmem.h ldo.h lstring.h lgc.h \

+ lvm.h

+lopcodes.o: lopcodes.c lprefix.h lopcodes.h llimits.h lua.h luaconf.h

+loslib.o: loslib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h

+lparser.o: lparser.c lprefix.h lua.h luaconf.h lcode.h llex.h lobject.h \

+ llimits.h lzio.h lmem.h lopcodes.h lparser.h ldebug.h lstate.h ltm.h \

+ ldo.h lfunc.h lstring.h lgc.h ltable.h

+lstate.o: lstate.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \

+ lobject.h ltm.h lzio.h lmem.h ldebug.h ldo.h lfunc.h lgc.h llex.h \

+ lstring.h ltable.h

+lstring.o: lstring.c lprefix.h lua.h luaconf.h ldebug.h lstate.h \

+ lobject.h llimits.h ltm.h lzio.h lmem.h ldo.h lstring.h lgc.h

+lstrlib.o: lstrlib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h

+ltable.o: ltable.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \

+ llimits.h ltm.h lzio.h lmem.h ldo.h lgc.h lstring.h ltable.h lvm.h

+ltablib.o: ltablib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h

+ltm.o: ltm.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \

+ llimits.h ltm.h lzio.h lmem.h ldo.h lgc.h lstring.h ltable.h lvm.h

+lua.o: lua.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h

+luac.o: luac.c lprefix.h lua.h luaconf.h lauxlib.h ldebug.h lstate.h \

+ lobject.h llimits.h ltm.h lzio.h lmem.h lopcodes.h lopnames.h lundump.h

+lundump.o: lundump.c lprefix.h lua.h luaconf.h ldebug.h lstate.h \

+ lobject.h llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lstring.h lgc.h \

+ lundump.h

+lutf8lib.o: lutf8lib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h

+lvm.o: lvm.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \

+ llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h lopcodes.h lstring.h \

+ ltable.h lvm.h ljumptab.h

+lzio.o: lzio.c lprefix.h lua.h luaconf.h llimits.h lmem.h lstate.h \

+ lobject.h ltm.h lzio.h

+

+# (end of Makefile)

--- /dev/null

+++ b/lapi.c

@@ -1,0 +1,1431 @@

+/*

+** $Id: lapi.c $

+** Lua API

+** See Copyright Notice in lua.h

+*/

+

+#define lapi_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <limits.h>

+#include <stdarg.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "lapi.h"

+#include "ldebug.h"

+#include "ldo.h"

+#include "lfunc.h"

+#include "lgc.h"

+#include "lmem.h"

+#include "lobject.h"

+#include "lstate.h"

+#include "lstring.h"

+#include "ltable.h"

+#include "ltm.h"

+#include "lundump.h"

+#include "lvm.h"

+

+

+

+const char lua_ident[] =

+  "$LuaVersion: " LUA_COPYRIGHT " $"

+  "$LuaAuthors: " LUA_AUTHORS " $";

+

+

+

+/*

+** Test for a valid index.

+** '!ttisnil(o)' implies 'o != &G(L)->nilvalue', so it is not needed.

+** However, it covers the most common cases in a faster way.

+*/

+#define isvalid(L, o)	(!ttisnil(o) || o != &G(L)->nilvalue)

+

+

+/* test for pseudo index */

+#define ispseudo(i)		((i) <= LUA_REGISTRYINDEX)

+

+/* test for upvalue */

+#define isupvalue(i)		((i) < LUA_REGISTRYINDEX)

+

+

+static TValue *index2value (lua_State *L, int idx) {

+  CallInfo *ci = L->ci;

+  if (idx > 0) {

+    StkId o = ci->func + idx;

+    api_check(L, idx <= L->ci->top - (ci->func + 1), "unacceptable index");

+    if (o >= L->top) return &G(L)->nilvalue;

+    else return s2v(o);

+  }

+  else if (!ispseudo(idx)) {  /* negative index */

+    api_check(L, idx != 0 && -idx <= L->top - (ci->func + 1), "invalid index");

+    return s2v(L->top + idx);

+  }

+  else if (idx == LUA_REGISTRYINDEX)

+    return &G(L)->l_registry;

+  else {  /* upvalues */

+    idx = LUA_REGISTRYINDEX - idx;

+    api_check(L, idx <= MAXUPVAL + 1, "upvalue index too large");

+    if (ttislcf(s2v(ci->func)))  /* light C function? */

+      return &G(L)->nilvalue;  /* it has no upvalues */

+    else {

+      CClosure *func = clCvalue(s2v(ci->func));

+      return (idx <= func->nupvalues) ? &func->upvalue[idx-1] : &G(L)->nilvalue;

+    }

+  }

+}

+

+

+static StkId index2stack (lua_State *L, int idx) {

+  CallInfo *ci = L->ci;

+  if (idx > 0) {

+    StkId o = ci->func + idx;

+    api_check(L, o < L->top, "unacceptable index");

+    return o;

+  }

+  else {    /* non-positive index */

+    api_check(L, idx != 0 && -idx <= L->top - (ci->func + 1), "invalid index");

+    api_check(L, !ispseudo(idx), "invalid index");

+    return L->top + idx;

+  }

+}

+

+

+LUA_API int lua_checkstack (lua_State *L, int n) {

+  int res;

+  CallInfo *ci;

+  lua_lock(L);

+  ci = L->ci;

+  api_check(L, n >= 0, "negative 'n'");

+  if (L->stack_last - L->top > n)  /* stack large enough? */

+    res = 1;  /* yes; check is OK */

+  else {  /* no; need to grow stack */

+    int inuse = cast_int(L->top - L->stack) + EXTRA_STACK;

+    if (inuse > LUAI_MAXSTACK - n)  /* can grow without overflow? */

+      res = 0;  /* no */

+    else  /* try to grow stack */

+      res = luaD_growstack(L, n, 0);

+  }

+  if (res && ci->top < L->top + n)

+    ci->top = L->top + n;  /* adjust frame top */

+  lua_unlock(L);

+  return res;

+}

+

+

+LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {

+  int i;

+  if (from == to) return;

+  lua_lock(to);

+  api_checknelems(from, n);

+  api_check(from, G(from) == G(to), "moving among independent states");

+  api_check(from, to->ci->top - to->top >= n, "stack overflow");

+  from->top -= n;

+  for (i = 0; i < n; i++) {

+    setobjs2s(to, to->top, from->top + i);

+    to->top++;  /* stack already checked by previous 'api_check' */

+  }

+  lua_unlock(to);

+}

+

+

+LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {

+  lua_CFunction old;

+  lua_lock(L);

+  old = G(L)->panic;

+  G(L)->panic = panicf;

+  lua_unlock(L);

+  return old;

+}

+

+

+LUA_API lua_Number lua_version (lua_State *L) {

+  UNUSED(L);

+  return LUA_VERSION_NUM;

+}

+

+

+

+/*

+** basic stack manipulation

+*/

+

+

+/*

+** convert an acceptable stack index into an absolute index

+*/

+LUA_API int lua_absindex (lua_State *L, int idx) {

+  return (idx > 0 || ispseudo(idx))

+         ? idx

+         : cast_int(L->top - L->ci->func) + idx;

+}

+

+

+LUA_API int lua_gettop (lua_State *L) {

+  return cast_int(L->top - (L->ci->func + 1));

+}

+

+

+LUA_API void lua_settop (lua_State *L, int idx) {

+  CallInfo *ci;

+  StkId func;

+  ptrdiff_t diff;  /* difference for new top */

+  lua_lock(L);

+  ci = L->ci;

+  func = ci->func;

+  if (idx >= 0) {

+    api_check(L, idx <= ci->top - (func + 1), "new top too large");

+    diff = ((func + 1) + idx) - L->top;

+    for (; diff > 0; diff--)

+      setnilvalue(s2v(L->top++));  /* clear new slots */

+  }

+  else {

+    api_check(L, -(idx+1) <= (L->top - (func + 1)), "invalid new top");

+    diff = idx + 1;  /* will "subtract" index (as it is negative) */

+  }

+  if (diff < 0 && hastocloseCfunc(ci->nresults))

+    luaF_close(L, L->top + diff, LUA_OK);

+  L->top += diff;  /* correct top only after closing any upvalue */

+  lua_unlock(L);

+}

+

+

+/*

+** Reverse the stack segment from 'from' to 'to'

+** (auxiliary to 'lua_rotate')

+** Note that we move(copy) only the value inside the stack.

+** (We do not move additional fields that may exist.)

+*/

+static void reverse (lua_State *L, StkId from, StkId to) {

+  for (; from < to; from++, to--) {

+    TValue temp;

+    setobj(L, &temp, s2v(from));

+    setobjs2s(L, from, to);

+    setobj2s(L, to, &temp);

+  }

+}

+

+

+/*

+** Let x = AB, where A is a prefix of length 'n'. Then,

+** rotate x n == BA. But BA == (A^r . B^r)^r.

+*/

+LUA_API void lua_rotate (lua_State *L, int idx, int n) {

+  StkId p, t, m;

+  lua_lock(L);

+  t = L->top - 1;  /* end of stack segment being rotated */

+  p = index2stack(L, idx);  /* start of segment */

+  api_check(L, (n >= 0 ? n : -n) <= (t - p + 1), "invalid 'n'");

+  m = (n >= 0 ? t - n : p - n - 1);  /* end of prefix */

+  reverse(L, p, m);  /* reverse the prefix with length 'n' */

+  reverse(L, m + 1, t);  /* reverse the suffix */

+  reverse(L, p, t);  /* reverse the entire segment */

+  lua_unlock(L);

+}

+

+

+LUA_API void lua_copy (lua_State *L, int fromidx, int toidx) {

+  TValue *fr, *to;

+  lua_lock(L);

+  fr = index2value(L, fromidx);

+  to = index2value(L, toidx);

+  api_check(L, isvalid(L, to), "invalid index");

+  setobj(L, to, fr);

+  if (isupvalue(toidx))  /* function upvalue? */

+    luaC_barrier(L, clCvalue(s2v(L->ci->func)), fr);

+  /* LUA_REGISTRYINDEX does not need gc barrier

+     (collector revisits it before finishing collection) */

+  lua_unlock(L);

+}

+

+

+LUA_API void lua_pushvalue (lua_State *L, int idx) {

+  lua_lock(L);

+  setobj2s(L, L->top, index2value(L, idx));

+  api_incr_top(L);

+  lua_unlock(L);

+}

+

+

+

+/*

+** access functions (stack -> C)

+*/

+

+

+LUA_API int lua_type (lua_State *L, int idx) {

+  const TValue *o = index2value(L, idx);

+  return (isvalid(L, o) ? ttype(o) : LUA_TNONE);

+}

+

+

+LUA_API const char *lua_typename (lua_State *L, int t) {

+  UNUSED(L);

+  api_check(L, LUA_TNONE <= t && t < LUA_NUMTYPES, "invalid type");

+  return ttypename(t);

+}

+

+

+LUA_API int lua_iscfunction (lua_State *L, int idx) {

+  const TValue *o = index2value(L, idx);

+  return (ttislcf(o) || (ttisCclosure(o)));

+}

+

+

+LUA_API int lua_isinteger (lua_State *L, int idx) {

+  const TValue *o = index2value(L, idx);

+  return ttisinteger(o);

+}

+

+

+LUA_API int lua_isnumber (lua_State *L, int idx) {

+  lua_Number n;

+  const TValue *o = index2value(L, idx);

+  return tonumber(o, &n);

+}

+

+

+LUA_API int lua_isstring (lua_State *L, int idx) {

+  const TValue *o = index2value(L, idx);

+  return (ttisstring(o) || cvt2str(o));

+}

+

+

+LUA_API int lua_isuserdata (lua_State *L, int idx) {

+  const TValue *o = index2value(L, idx);

+  return (ttisfulluserdata(o) || ttislightuserdata(o));

+}

+

+

+LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {

+  const TValue *o1 = index2value(L, index1);

+  const TValue *o2 = index2value(L, index2);

+  return (isvalid(L, o1) && isvalid(L, o2)) ? luaV_rawequalobj(o1, o2) : 0;

+}

+

+

+LUA_API void lua_arith (lua_State *L, int op) {

+  lua_lock(L);

+  if (op != LUA_OPUNM && op != LUA_OPBNOT)

+    api_checknelems(L, 2);  /* all other operations expect two operands */

+  else {  /* for unary operations, add fake 2nd operand */

+    api_checknelems(L, 1);

+    setobjs2s(L, L->top, L->top - 1);

+    api_incr_top(L);

+  }

+  /* first operand at top - 2, second at top - 1; result go to top - 2 */

+  luaO_arith(L, op, s2v(L->top - 2), s2v(L->top - 1), L->top - 2);

+  L->top--;  /* remove second operand */

+  lua_unlock(L);

+}

+

+

+LUA_API int lua_compare (lua_State *L, int index1, int index2, int op) {

+  const TValue *o1;

+  const TValue *o2;

+  int i = 0;

+  lua_lock(L);  /* may call tag method */

+  o1 = index2value(L, index1);

+  o2 = index2value(L, index2);

+  if (isvalid(L, o1) && isvalid(L, o2)) {

+    switch (op) {

+      case LUA_OPEQ: i = luaV_equalobj(L, o1, o2); break;

+      case LUA_OPLT: i = luaV_lessthan(L, o1, o2); break;

+      case LUA_OPLE: i = luaV_lessequal(L, o1, o2); break;

+      default: api_check(L, 0, "invalid option");

+    }

+  }

+  lua_unlock(L);

+  return i;

+}

+

+

+LUA_API size_t lua_stringtonumber (lua_State *L, const char *s) {

+  size_t sz = luaO_str2num(s, s2v(L->top));

+  if (sz != 0)

+    api_incr_top(L);

+  return sz;

+}

+

+

+LUA_API lua_Number lua_tonumberx (lua_State *L, int idx, int *pisnum) {

+  lua_Number n = 0;

+  const TValue *o = index2value(L, idx);

+  int isnum = tonumber(o, &n);

+  if (pisnum)

+    *pisnum = isnum;

+  return n;

+}

+

+

+LUA_API lua_Integer lua_tointegerx (lua_State *L, int idx, int *pisnum) {

+  lua_Integer res = 0;

+  const TValue *o = index2value(L, idx);

+  int isnum = tointeger(o, &res);

+  if (pisnum)

+    *pisnum = isnum;

+  return res;

+}

+

+

+LUA_API int lua_toboolean (lua_State *L, int idx) {

+  const TValue *o = index2value(L, idx);

+  return !l_isfalse(o);

+}

+

+

+LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {

+  TValue *o;

+  lua_lock(L);

+  o = index2value(L, idx);

+  if (!ttisstring(o)) {

+    if (!cvt2str(o)) {  /* not convertible? */

+      if (len != NULL) *len = 0;

+      lua_unlock(L);

+      return NULL;

+    }

+    luaO_tostring(L, o);

+    luaC_checkGC(L);

+    o = index2value(L, idx);  /* previous call may reallocate the stack */

+  }

+  if (len != NULL)

+    *len = vslen(o);

+  lua_unlock(L);

+  return svalue(o);

+}

+

+

+LUA_API lua_Unsigned lua_rawlen (lua_State *L, int idx) {

+  const TValue *o = index2value(L, idx);

+  switch (ttypetag(o)) {

+    case LUA_VSHRSTR: return tsvalue(o)->shrlen;

+    case LUA_VLNGSTR: return tsvalue(o)->u.lnglen;

+    case LUA_VUSERDATA: return uvalue(o)->len;

+    case LUA_VTABLE: return luaH_getn(hvalue(o));

+    default: return 0;

+  }

+}

+

+

+LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {

+  const TValue *o = index2value(L, idx);

+  if (ttislcf(o)) return fvalue(o);

+  else if (ttisCclosure(o))

+    return clCvalue(o)->f;

+  else return NULL;  /* not a C function */

+}

+

+

+static void *touserdata (const TValue *o) {

+  switch (ttype(o)) {

+    case LUA_TUSERDATA: return getudatamem(uvalue(o));

+    case LUA_TLIGHTUSERDATA: return pvalue(o);

+    default: return NULL;

+  }

+}

+

+

+LUA_API void *lua_touserdata (lua_State *L, int idx) {

+  const TValue *o = index2value(L, idx);

+  return touserdata(o);

+}

+

+

+LUA_API lua_State *lua_tothread (lua_State *L, int idx) {

+  const TValue *o = index2value(L, idx);

+  return (!ttisthread(o)) ? NULL : thvalue(o);

+}

+

+

+/*

+** Returns a pointer to the internal representation of an object.

+** Note that ANSI C does not allow the conversion of a pointer to

+** function to a 'void*', so the conversion here goes through

+** a 'size_t'. (As the returned pointer is only informative, this

+** conversion should not be a problem.)

+*/

+LUA_API const void *lua_topointer (lua_State *L, int idx) {

+  const TValue *o = index2value(L, idx);

+  switch (ttypetag(o)) {

+    case LUA_VLCF: return cast_voidp(cast_sizet(fvalue(o)));

+    case LUA_VUSERDATA: case LUA_VLIGHTUSERDATA:

+      return touserdata(o);

+    default: {

+      if (iscollectable(o))

+        return gcvalue(o);

+      else

+        return NULL;

+    }

+  }

+}

+

+

+

+/*

+** push functions (C -> stack)

+*/

+

+

+LUA_API void lua_pushnil (lua_State *L) {

+  lua_lock(L);

+  setnilvalue(s2v(L->top));

+  api_incr_top(L);

+  lua_unlock(L);

+}

+

+

+LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {

+  lua_lock(L);

+  setfltvalue(s2v(L->top), n);

+  api_incr_top(L);

+  lua_unlock(L);

+}

+

+

+LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {

+  lua_lock(L);

+  setivalue(s2v(L->top), n);

+  api_incr_top(L);

+  lua_unlock(L);

+}

+

+

+/*

+** Pushes on the stack a string with given length. Avoid using 's' when

+** 'len' == 0 (as 's' can be NULL in that case), due to later use of

+** 'memcmp' and 'memcpy'.

+*/

+LUA_API const char *lua_pushlstring (lua_State *L, const char *s, size_t len) {

+  TString *ts;

+  lua_lock(L);

+  ts = (len == 0) ? luaS_new(L, "") : luaS_newlstr(L, s, len);

+  setsvalue2s(L, L->top, ts);

+  api_incr_top(L);

+  luaC_checkGC(L);

+  lua_unlock(L);

+  return getstr(ts);

+}

+

+

+LUA_API const char *lua_pushstring (lua_State *L, const char *s) {

+  lua_lock(L);

+  if (s == NULL)

+    setnilvalue(s2v(L->top));

+  else {

+    TString *ts;

+    ts = luaS_new(L, s);

+    setsvalue2s(L, L->top, ts);

+    s = getstr(ts);  /* internal copy's address */

+  }

+  api_incr_top(L);

+  luaC_checkGC(L);

+  lua_unlock(L);

+  return s;

+}

+

+

+LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,

+                                      va_list argp) {

+  const char *ret;

+  lua_lock(L);

+  ret = luaO_pushvfstring(L, fmt, argp);

+  luaC_checkGC(L);

+  lua_unlock(L);

+  return ret;

+}

+

+

+LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {

+  const char *ret;

+  va_list argp;

+  lua_lock(L);

+  va_start(argp, fmt);

+  ret = luaO_pushvfstring(L, fmt, argp);

+  va_end(argp);

+  luaC_checkGC(L);

+  lua_unlock(L);

+  return ret;

+}

+

+

+LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {

+  lua_lock(L);

+  if (n == 0) {

+    setfvalue(s2v(L->top), fn);

+    api_incr_top(L);

+  }

+  else {

+    CClosure *cl;

+    api_checknelems(L, n);

+    api_check(L, n <= MAXUPVAL, "upvalue index too large");

+    cl = luaF_newCclosure(L, n);

+    cl->f = fn;

+    L->top -= n;

+    while (n--) {

+      setobj2n(L, &cl->upvalue[n], s2v(L->top + n));

+      /* does not need barrier because closure is white */

+      lua_assert(iswhite(cl));

+    }

+    setclCvalue(L, s2v(L->top), cl);

+    api_incr_top(L);

+    luaC_checkGC(L);

+  }

+  lua_unlock(L);

+}

+

+

+LUA_API void lua_pushboolean (lua_State *L, int b) {

+  lua_lock(L);

+  if (b)

+    setbtvalue(s2v(L->top));

+  else

+    setbfvalue(s2v(L->top));

+  api_incr_top(L);

+  lua_unlock(L);

+}

+

+

+LUA_API void lua_pushlightuserdata (lua_State *L, void *p) {

+  lua_lock(L);

+  setpvalue(s2v(L->top), p);

+  api_incr_top(L);

+  lua_unlock(L);

+}

+

+

+LUA_API int lua_pushthread (lua_State *L) {

+  lua_lock(L);

+  setthvalue(L, s2v(L->top), L);

+  api_incr_top(L);

+  lua_unlock(L);

+  return (G(L)->mainthread == L);

+}

+

+

+

+/*

+** get functions (Lua -> stack)

+*/

+

+

+static int auxgetstr (lua_State *L, const TValue *t, const char *k) {

+  const TValue *slot;

+  TString *str = luaS_new(L, k);

+  if (luaV_fastget(L, t, str, slot, luaH_getstr)) {

+    setobj2s(L, L->top, slot);

+    api_incr_top(L);

+  }

+  else {

+    setsvalue2s(L, L->top, str);

+    api_incr_top(L);

+    luaV_finishget(L, t, s2v(L->top - 1), L->top - 1, slot);

+  }

+  lua_unlock(L);

+  return ttype(s2v(L->top - 1));

+}

+

+

+LUA_API int lua_getglobal (lua_State *L, const char *name) {

+  Table *reg;

+  lua_lock(L);

+  reg = hvalue(&G(L)->l_registry);

+  return auxgetstr(L, luaH_getint(reg, LUA_RIDX_GLOBALS), name);

+}

+

+

+LUA_API int lua_gettable (lua_State *L, int idx) {

+  const TValue *slot;

+  TValue *t;

+  lua_lock(L);

+  t = index2value(L, idx);

+  if (luaV_fastget(L, t, s2v(L->top - 1), slot, luaH_get)) {

+    setobj2s(L, L->top - 1, slot);

+  }

+  else

+    luaV_finishget(L, t, s2v(L->top - 1), L->top - 1, slot);

+  lua_unlock(L);

+  return ttype(s2v(L->top - 1));

+}

+

+

+LUA_API int lua_getfield (lua_State *L, int idx, const char *k) {

+  lua_lock(L);

+  return auxgetstr(L, index2value(L, idx), k);

+}

+

+

+LUA_API int lua_geti (lua_State *L, int idx, lua_Integer n) {

+  TValue *t;

+  const TValue *slot;

+  lua_lock(L);

+  t = index2value(L, idx);

+  if (luaV_fastgeti(L, t, n, slot)) {

+    setobj2s(L, L->top, slot);

+  }

+  else {

+    TValue aux;

+    setivalue(&aux, n);

+    luaV_finishget(L, t, &aux, L->top, slot);

+  }

+  api_incr_top(L);

+  lua_unlock(L);

+  return ttype(s2v(L->top - 1));

+}

+

+

+static int finishrawget (lua_State *L, const TValue *val) {

+  if (isempty(val))  /* avoid copying empty items to the stack */

+    setnilvalue(s2v(L->top));

+  else

+    setobj2s(L, L->top, val);

+  api_incr_top(L);

+  lua_unlock(L);

+  return ttype(s2v(L->top - 1));

+}

+

+

+static Table *gettable (lua_State *L, int idx) {

+  TValue *t = index2value(L, idx);

+  api_check(L, ttistable(t), "table expected");

+  return hvalue(t);

+}

+

+

+LUA_API int lua_rawget (lua_State *L, int idx) {

+  Table *t;

+  const TValue *val;

+  lua_lock(L);

+  api_checknelems(L, 1);

+  t = gettable(L, idx);

+  val = luaH_get(t, s2v(L->top - 1));

+  L->top--;  /* remove key */

+  return finishrawget(L, val);

+}

+

+

+LUA_API int lua_rawgeti (lua_State *L, int idx, lua_Integer n) {

+  Table *t;

+  lua_lock(L);

+  t = gettable(L, idx);

+  return finishrawget(L, luaH_getint(t, n));

+}

+

+

+LUA_API int lua_rawgetp (lua_State *L, int idx, const void *p) {

+  Table *t;

+  TValue k;

+  lua_lock(L);

+  t = gettable(L, idx);

+  setpvalue(&k, cast_voidp(p));

+  return finishrawget(L, luaH_get(t, &k));

+}

+

+

+LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {

+  Table *t;

+  lua_lock(L);

+  t = luaH_new(L);

+  sethvalue2s(L, L->top, t);

+  api_incr_top(L);

+  if (narray > 0 || nrec > 0)

+    luaH_resize(L, t, narray, nrec);

+  luaC_checkGC(L);

+  lua_unlock(L);

+}

+

+

+LUA_API int lua_getmetatable (lua_State *L, int objindex) {

+  const TValue *obj;

+  Table *mt;

+  int res = 0;

+  lua_lock(L);

+  obj = index2value(L, objindex);

+  switch (ttype(obj)) {

+    case LUA_TTABLE:

+      mt = hvalue(obj)->metatable;

+      break;

+    case LUA_TUSERDATA:

+      mt = uvalue(obj)->metatable;

+      break;

+    default:

+      mt = G(L)->mt[ttype(obj)];

+      break;

+  }

+  if (mt != NULL) {

+    sethvalue2s(L, L->top, mt);

+    api_incr_top(L);

+    res = 1;

+  }

+  lua_unlock(L);

+  return res;

+}

+

+

+LUA_API int lua_getiuservalue (lua_State *L, int idx, int n) {

+  TValue *o;

+  int t;

+  lua_lock(L);

+  o = index2value(L, idx);

+  api_check(L, ttisfulluserdata(o), "full userdata expected");

+  if (n <= 0 || n > uvalue(o)->nuvalue) {

+    setnilvalue(s2v(L->top));

+    t = LUA_TNONE;

+  }

+  else {

+    setobj2s(L, L->top, &uvalue(o)->uv[n - 1].uv);

+    t = ttype(s2v(L->top));

+  }

+  api_incr_top(L);

+  lua_unlock(L);

+  return t;

+}

+

+

+/*

+** set functions (stack -> Lua)

+*/

+

+/*

+** t[k] = value at the top of the stack (where 'k' is a string)

+*/

+static void auxsetstr (lua_State *L, const TValue *t, const char *k) {

+  const TValue *slot;

+  TString *str = luaS_new(L, k);

+  api_checknelems(L, 1);

+  if (luaV_fastget(L, t, str, slot, luaH_getstr)) {

+    luaV_finishfastset(L, t, slot, s2v(L->top - 1));

+    L->top--;  /* pop value */

+  }

+  else {

+    setsvalue2s(L, L->top, str);  /* push 'str' (to make it a TValue) */

+    api_incr_top(L);

+    luaV_finishset(L, t, s2v(L->top - 1), s2v(L->top - 2), slot);

+    L->top -= 2;  /* pop value and key */

+  }

+  lua_unlock(L);  /* lock done by caller */

+}

+

+

+LUA_API void lua_setglobal (lua_State *L, const char *name) {

+  Table *reg;

+  lua_lock(L);  /* unlock done in 'auxsetstr' */

+  reg = hvalue(&G(L)->l_registry);

+  auxsetstr(L, luaH_getint(reg, LUA_RIDX_GLOBALS), name);

+}

+

+

+LUA_API void lua_settable (lua_State *L, int idx) {

+  TValue *t;

+  const TValue *slot;

+  lua_lock(L);

+  api_checknelems(L, 2);

+  t = index2value(L, idx);

+  if (luaV_fastget(L, t, s2v(L->top - 2), slot, luaH_get)) {

+    luaV_finishfastset(L, t, slot, s2v(L->top - 1));

+  }

+  else

+    luaV_finishset(L, t, s2v(L->top - 2), s2v(L->top - 1), slot);

+  L->top -= 2;  /* pop index and value */

+  lua_unlock(L);

+}

+

+

+LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {

+  lua_lock(L);  /* unlock done in 'auxsetstr' */

+  auxsetstr(L, index2value(L, idx), k);

+}

+

+

+LUA_API void lua_seti (lua_State *L, int idx, lua_Integer n) {

+  TValue *t;

+  const TValue *slot;

+  lua_lock(L);

+  api_checknelems(L, 1);

+  t = index2value(L, idx);

+  if (luaV_fastgeti(L, t, n, slot)) {

+    luaV_finishfastset(L, t, slot, s2v(L->top - 1));

+  }

+  else {

+    TValue aux;

+    setivalue(&aux, n);

+    luaV_finishset(L, t, &aux, s2v(L->top - 1), slot);

+  }

+  L->top--;  /* pop value */

+  lua_unlock(L);

+}

+

+

+static void aux_rawset (lua_State *L, int idx, TValue *key, int n) {

+  Table *t;

+  TValue *slot;

+  lua_lock(L);

+  api_checknelems(L, n);

+  t = gettable(L, idx);

+  slot = luaH_set(L, t, key);

+  setobj2t(L, slot, s2v(L->top - 1));

+  invalidateTMcache(t);

+  luaC_barrierback(L, obj2gco(t), s2v(L->top - 1));

+  L->top -= n;

+  lua_unlock(L);

+}

+

+

+LUA_API void lua_rawset (lua_State *L, int idx) {

+  aux_rawset(L, idx, s2v(L->top - 2), 2);

+}

+

+

+LUA_API void lua_rawsetp (lua_State *L, int idx, const void *p) {

+  TValue k;

+  setpvalue(&k, cast_voidp(p));

+  aux_rawset(L, idx, &k, 1);

+}

+

+

+LUA_API void lua_rawseti (lua_State *L, int idx, lua_Integer n) {

+  Table *t;

+  lua_lock(L);

+  api_checknelems(L, 1);

+  t = gettable(L, idx);

+  luaH_setint(L, t, n, s2v(L->top - 1));

+  luaC_barrierback(L, obj2gco(t), s2v(L->top - 1));

+  L->top--;

+  lua_unlock(L);

+}

+

+

+LUA_API int lua_setmetatable (lua_State *L, int objindex) {

+  TValue *obj;

+  Table *mt;

+  lua_lock(L);

+  api_checknelems(L, 1);

+  obj = index2value(L, objindex);

+  if (ttisnil(s2v(L->top - 1)))

+    mt = NULL;

+  else {

+    api_check(L, ttistable(s2v(L->top - 1)), "table expected");

+    mt = hvalue(s2v(L->top - 1));

+  }

+  switch (ttype(obj)) {

+    case LUA_TTABLE: {

+      hvalue(obj)->metatable = mt;

+      if (mt) {

+        luaC_objbarrier(L, gcvalue(obj), mt);

+        luaC_checkfinalizer(L, gcvalue(obj), mt);

+      }

+      break;

+    }

+    case LUA_TUSERDATA: {

+      uvalue(obj)->metatable = mt;

+      if (mt) {

+        luaC_objbarrier(L, uvalue(obj), mt);

+        luaC_checkfinalizer(L, gcvalue(obj), mt);

+      }

+      break;

+    }

+    default: {

+      G(L)->mt[ttype(obj)] = mt;

+      break;

+    }

+  }

+  L->top--;

+  lua_unlock(L);

+  return 1;

+}

+

+

+LUA_API int lua_setiuservalue (lua_State *L, int idx, int n) {

+  TValue *o;

+  int res;

+  lua_lock(L);

+  api_checknelems(L, 1);

+  o = index2value(L, idx);

+  api_check(L, ttisfulluserdata(o), "full userdata expected");

+  if (!(cast_uint(n) - 1u < cast_uint(uvalue(o)->nuvalue)))

+    res = 0;  /* 'n' not in [1, uvalue(o)->nuvalue] */

+  else {

+    setobj(L, &uvalue(o)->uv[n - 1].uv, s2v(L->top - 1));

+    luaC_barrierback(L, gcvalue(o), s2v(L->top - 1));

+    res = 1;

+  }

+  L->top--;

+  lua_unlock(L);

+  return res;

+}

+

+

+/*

+** 'load' and 'call' functions (run Lua code)

+*/

+

+

+#define checkresults(L,na,nr) \

+     api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)), \

+	"results from function overflow current stack size")

+

+

+LUA_API void lua_callk (lua_State *L, int nargs, int nresults,

+                        lua_KContext ctx, lua_KFunction k) {

+  StkId func;

+  lua_lock(L);

+  api_check(L, k == NULL || !isLua(L->ci),

+    "cannot use continuations inside hooks");

+  api_checknelems(L, nargs+1);

+  api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread");

+  checkresults(L, nargs, nresults);

+  func = L->top - (nargs+1);

+  if (k != NULL && yieldable(L)) {  /* need to prepare continuation? */

+    L->ci->u.c.k = k;  /* save continuation */

+    L->ci->u.c.ctx = ctx;  /* save context */

+    luaD_call(L, func, nresults);  /* do the call */

+  }

+  else  /* no continuation or no yieldable */

+    luaD_callnoyield(L, func, nresults);  /* just do the call */

+  adjustresults(L, nresults);

+  lua_unlock(L);

+}

+

+

+

+/*

+** Execute a protected call.

+*/

+struct CallS {  /* data to 'f_call' */

+  StkId func;

+  int nresults;

+};

+

+

+static void f_call (lua_State *L, void *ud) {

+  struct CallS *c = cast(struct CallS *, ud);

+  luaD_callnoyield(L, c->func, c->nresults);

+}

+

+

+

+LUA_API int lua_pcallk (lua_State *L, int nargs, int nresults, int errfunc,

+                        lua_KContext ctx, lua_KFunction k) {

+  struct CallS c;

+  int status;

+  ptrdiff_t func;

+  lua_lock(L);

+  api_check(L, k == NULL || !isLua(L->ci),

+    "cannot use continuations inside hooks");

+  api_checknelems(L, nargs+1);

+  api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread");

+  checkresults(L, nargs, nresults);

+  if (errfunc == 0)

+    func = 0;

+  else {

+    StkId o = index2stack(L, errfunc);

+    api_check(L, ttisfunction(s2v(o)), "error handler must be a function");

+    func = savestack(L, o);

+  }

+  c.func = L->top - (nargs+1);  /* function to be called */

+  if (k == NULL || !yieldable(L)) {  /* no continuation or no yieldable? */

+    c.nresults = nresults;  /* do a 'conventional' protected call */

+    status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);

+  }

+  else {  /* prepare continuation (call is already protected by 'resume') */

+    CallInfo *ci = L->ci;

+    ci->u.c.k = k;  /* save continuation */

+    ci->u.c.ctx = ctx;  /* save context */

+    /* save information for error recovery */

+    ci->u2.funcidx = cast_int(savestack(L, c.func));

+    ci->u.c.old_errfunc = L->errfunc;

+    L->errfunc = func;

+    setoah(ci->callstatus, L->allowhook);  /* save value of 'allowhook' */

+    ci->callstatus |= CIST_YPCALL;  /* function can do error recovery */

+    luaD_call(L, c.func, nresults);  /* do the call */

+    ci->callstatus &= ~CIST_YPCALL;

+    L->errfunc = ci->u.c.old_errfunc;

+    status = LUA_OK;  /* if it is here, there were no errors */

+  }

+  adjustresults(L, nresults);

+  lua_unlock(L);

+  return status;

+}

+

+

+LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,

+                      const char *chunkname, const char *mode) {

+  ZIO z;

+  int status;

+  lua_lock(L);

+  if (!chunkname) chunkname = "?";

+  luaZ_init(L, &z, reader, data);

+  status = luaD_protectedparser(L, &z, chunkname, mode);

+  if (status == LUA_OK) {  /* no errors? */

+    LClosure *f = clLvalue(s2v(L->top - 1));  /* get newly created function */

+    if (f->nupvalues >= 1) {  /* does it have an upvalue? */

+      /* get global table from registry */

+      Table *reg = hvalue(&G(L)->l_registry);

+      const TValue *gt = luaH_getint(reg, LUA_RIDX_GLOBALS);

+      /* set global table as 1st upvalue of 'f' (may be LUA_ENV) */

+      setobj(L, f->upvals[0]->v, gt);

+      luaC_barrier(L, f->upvals[0], gt);

+    }

+  }

+  lua_unlock(L);

+  return status;

+}

+

+

+LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data, int strip) {

+  int status;

+  TValue *o;

+  lua_lock(L);

+  api_checknelems(L, 1);

+  o = s2v(L->top - 1);

+  if (isLfunction(o))

+    status = luaU_dump(L, getproto(o), writer, data, strip);

+  else

+    status = 1;

+  lua_unlock(L);

+  return status;

+}

+

+

+LUA_API int lua_status (lua_State *L) {

+  return L->status;

+}

+

+

+/*

+** Garbage-collection function

+*/

+LUA_API int lua_gc (lua_State *L, int what, ...) {

+  va_list argp;

+  int res = 0;

+  global_State *g;

+  lua_lock(L);

+  g = G(L);

+  va_start(argp, what);

+  switch (what) {

+    case LUA_GCSTOP: {

+      g->gcrunning = 0;

+      break;

+    }

+    case LUA_GCRESTART: {

+      luaE_setdebt(g, 0);

+      g->gcrunning = 1;

+      break;

+    }

+    case LUA_GCCOLLECT: {

+      luaC_fullgc(L, 0);

+      break;

+    }

+    case LUA_GCCOUNT: {

+      /* GC values are expressed in Kbytes: #bytes/2^10 */

+      res = cast_int(gettotalbytes(g) >> 10);

+      break;

+    }

+    case LUA_GCCOUNTB: {

+      res = cast_int(gettotalbytes(g) & 0x3ff);

+      break;

+    }

+    case LUA_GCSTEP: {

+      int data = va_arg(argp, int);

+      l_mem debt = 1;  /* =1 to signal that it did an actual step */

+      lu_byte oldrunning = g->gcrunning;

+      g->gcrunning = 1;  /* allow GC to run */

+      if (data == 0) {

+        luaE_setdebt(g, 0);  /* do a basic step */

+        luaC_step(L);

+      }

+      else {  /* add 'data' to total debt */

+        debt = cast(l_mem, data) * 1024 + g->GCdebt;

+        luaE_setdebt(g, debt);

+        luaC_checkGC(L);

+      }

+      g->gcrunning = oldrunning;  /* restore previous state */

+      if (debt > 0 && g->gcstate == GCSpause)  /* end of cycle? */

+        res = 1;  /* signal it */

+      break;

+    }

+    case LUA_GCSETPAUSE: {

+      int data = va_arg(argp, int);

+      res = getgcparam(g->gcpause);

+      setgcparam(g->gcpause, data);

+      break;

+    }

+    case LUA_GCSETSTEPMUL: {

+      int data = va_arg(argp, int);

+      res = getgcparam(g->gcstepmul);

+      setgcparam(g->gcstepmul, data);

+      break;

+    }

+    case LUA_GCISRUNNING: {

+      res = g->gcrunning;

+      break;

+    }

+    case LUA_GCGEN: {

+      int minormul = va_arg(argp, int);

+      int majormul = va_arg(argp, int);

+      res = isdecGCmodegen(g) ? LUA_GCGEN : LUA_GCINC;

+      if (minormul != 0)

+        g->genminormul = minormul;

+      if (majormul != 0)

+        setgcparam(g->genmajormul, majormul);

+      luaC_changemode(L, KGC_GEN);

+      break;

+    }

+    case LUA_GCINC: {

+      int pause = va_arg(argp, int);

+      int stepmul = va_arg(argp, int);

+      int stepsize = va_arg(argp, int);

+      res = isdecGCmodegen(g) ? LUA_GCGEN : LUA_GCINC;

+      if (pause != 0)

+        setgcparam(g->gcpause, pause);

+      if (stepmul != 0)

+        setgcparam(g->gcstepmul, stepmul);

+      if (stepsize != 0)

+        g->gcstepsize = stepsize;

+      luaC_changemode(L, KGC_INC);

+      break;

+    }

+    default: res = -1;  /* invalid option */

+  }

+  va_end(argp);

+  lua_unlock(L);

+  return res;

+}

+

+

+

+/*

+** miscellaneous functions

+*/

+

+

+LUA_API int lua_error (lua_State *L) {

+  TValue *errobj;

+  lua_lock(L);

+  errobj = s2v(L->top - 1);

+  api_checknelems(L, 1);

+  /* error object is the memory error message? */

+  if (ttisshrstring(errobj) && eqshrstr(tsvalue(errobj), G(L)->memerrmsg))

+    luaM_error(L);  /* raise a memory error */

+  else

+    luaG_errormsg(L);  /* raise a regular error */

+  /* code unreachable; will unlock when control actually leaves the kernel */

+  return 0;  /* to avoid warnings */

+}

+

+

+LUA_API int lua_next (lua_State *L, int idx) {

+  Table *t;

+  int more;

+  lua_lock(L);

+  api_checknelems(L, 1);

+  t = gettable(L, idx);

+  more = luaH_next(L, t, L->top - 1);

+  if (more) {

+    api_incr_top(L);

+  }

+  else  /* no more elements */

+    L->top -= 1;  /* remove key */

+  lua_unlock(L);

+  return more;

+}

+

+

+LUA_API void lua_toclose (lua_State *L, int idx) {

+  int nresults;

+  StkId o;

+  lua_lock(L);

+  o = index2stack(L, idx);

+  nresults = L->ci->nresults;

+  api_check(L, L->openupval == NULL || uplevel(L->openupval) <= o,

+               "marked index below or equal new one");

+  luaF_newtbcupval(L, o);  /* create new to-be-closed upvalue */

+  if (!hastocloseCfunc(nresults))  /* function not marked yet? */

+    L->ci->nresults = codeNresults(nresults);  /* mark it */

+  lua_assert(hastocloseCfunc(L->ci->nresults));

+  lua_unlock(L);

+}

+

+

+LUA_API void lua_concat (lua_State *L, int n) {

+  lua_lock(L);

+  api_checknelems(L, n);

+  if (n > 0)

+    luaV_concat(L, n);

+  else {  /* nothing to concatenate */

+    setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));  /* push empty string */

+    api_incr_top(L);

+  }

+  luaC_checkGC(L);

+  lua_unlock(L);

+}

+

+

+LUA_API void lua_len (lua_State *L, int idx) {

+  TValue *t;

+  lua_lock(L);

+  t = index2value(L, idx);

+  luaV_objlen(L, L->top, t);

+  api_incr_top(L);

+  lua_unlock(L);

+}

+

+

+LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) {

+  lua_Alloc f;

+  lua_lock(L);

+  if (ud) *ud = G(L)->ud;

+  f = G(L)->frealloc;

+  lua_unlock(L);

+  return f;

+}

+

+

+LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud) {

+  lua_lock(L);

+  G(L)->ud = ud;

+  G(L)->frealloc = f;

+  lua_unlock(L);

+}

+

+

+void lua_setwarnf (lua_State *L, lua_WarnFunction f, void *ud) {

+  lua_lock(L);

+  G(L)->ud_warn = ud;

+  G(L)->warnf = f;

+  lua_unlock(L);

+}

+

+

+void lua_warning (lua_State *L, const char *msg, int tocont) {

+  lua_lock(L);

+  luaE_warning(L, msg, tocont);

+  lua_unlock(L);

+}

+

+

+

+LUA_API void *lua_newuserdatauv (lua_State *L, size_t size, int nuvalue) {

+  Udata *u;

+  lua_lock(L);

+  api_check(L, 0 <= nuvalue && nuvalue < USHRT_MAX, "invalid value");

+  u = luaS_newudata(L, size, nuvalue);

+  setuvalue(L, s2v(L->top), u);

+  api_incr_top(L);

+  luaC_checkGC(L);

+  lua_unlock(L);

+  return getudatamem(u);

+}

+

+

+

+static const char *aux_upvalue (TValue *fi, int n, TValue **val,

+                                GCObject **owner) {

+  switch (ttypetag(fi)) {

+    case LUA_VCCL: {  /* C closure */

+      CClosure *f = clCvalue(fi);

+      if (!(cast_uint(n) - 1u < cast_uint(f->nupvalues)))

+        return NULL;  /* 'n' not in [1, f->nupvalues] */

+      *val = &f->upvalue[n-1];

+      if (owner) *owner = obj2gco(f);

+      return "";

+    }

+    case LUA_VLCL: {  /* Lua closure */

+      LClosure *f = clLvalue(fi);

+      TString *name;

+      Proto *p = f->p;

+      if (!(cast_uint(n) - 1u  < cast_uint(p->sizeupvalues)))

+        return NULL;  /* 'n' not in [1, p->sizeupvalues] */

+      *val = f->upvals[n-1]->v;

+      if (owner) *owner = obj2gco(f->upvals[n - 1]);

+      name = p->upvalues[n-1].name;

+      return (name == NULL) ? "(no name)" : getstr(name);

+    }

+    default: return NULL;  /* not a closure */

+  }

+}

+

+

+LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {

+  const char *name;

+  TValue *val = NULL;  /* to avoid warnings */

+  lua_lock(L);

+  name = aux_upvalue(index2value(L, funcindex), n, &val, NULL);

+  if (name) {

+    setobj2s(L, L->top, val);

+    api_incr_top(L);

+  }

+  lua_unlock(L);

+  return name;

+}

+

+

+LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {

+  const char *name;

+  TValue *val = NULL;  /* to avoid warnings */

+  GCObject *owner = NULL;  /* to avoid warnings */

+  TValue *fi;

+  lua_lock(L);

+  fi = index2value(L, funcindex);

+  api_checknelems(L, 1);

+  name = aux_upvalue(fi, n, &val, &owner);

+  if (name) {

+    L->top--;

+    setobj(L, val, s2v(L->top));

+    luaC_barrier(L, owner, val);

+  }

+  lua_unlock(L);

+  return name;

+}

+

+

+static UpVal **getupvalref (lua_State *L, int fidx, int n, LClosure **pf) {

+  static const UpVal *const nullup = NULL;

+  LClosure *f;

+  TValue *fi = index2value(L, fidx);

+  api_check(L, ttisLclosure(fi), "Lua function expected");

+  f = clLvalue(fi);

+  if (pf) *pf = f;

+  if (1 <= n && n <= f->p->sizeupvalues)

+    return &f->upvals[n - 1];  /* get its upvalue pointer */

+  else

+    return (UpVal**)&nullup;

+}

+

+

+LUA_API void *lua_upvalueid (lua_State *L, int fidx, int n) {

+  TValue *fi = index2value(L, fidx);

+  switch (ttypetag(fi)) {

+    case LUA_VLCL: {  /* lua closure */

+      return *getupvalref(L, fidx, n, NULL);

+    }

+    case LUA_VCCL: {  /* C closure */

+      CClosure *f = clCvalue(fi);

+      if (1 <= n && n <= f->nupvalues)

+        return &f->upvalue[n - 1];

+      /* else */

+    }  /* FALLTHROUGH */

+    case LUA_VLCF:

+      return NULL;  /* light C functions have no upvalues */

+    default: {

+      api_check(L, 0, "function expected");

+      return NULL;

+    }

+  }

+}

+

+

+LUA_API void lua_upvaluejoin (lua_State *L, int fidx1, int n1,

+                                            int fidx2, int n2) {

+  LClosure *f1;

+  UpVal **up1 = getupvalref(L, fidx1, n1, &f1);

+  UpVal **up2 = getupvalref(L, fidx2, n2, NULL);

+  api_check(L, *up1 != NULL && *up2 != NULL, "invalid upvalue index");

+  *up1 = *up2;

+  luaC_objbarrier(L, f1, *up1);

+}

+

+

--- /dev/null

+++ b/lapi.h

@@ -1,0 +1,47 @@

+/*

+** $Id: lapi.h $

+** Auxiliary functions from Lua API

+** See Copyright Notice in lua.h

+*/

+

+#ifndef lapi_h

+#define lapi_h

+

+

+#include "llimits.h"

+#include "lstate.h"

+

+

+/* Increments 'L->top', checking for stack overflows */

+#define api_incr_top(L)   {L->top++; api_check(L, L->top <= L->ci->top, \

+				"stack overflow");}

+

+

+/*

+** If a call returns too many multiple returns, the callee may not have

+** stack space to accommodate all results. In this case, this macro

+** increases its stack space ('L->ci->top').

+*/

+#define adjustresults(L,nres) \

+    { if ((nres) <= LUA_MULTRET && L->ci->top < L->top) L->ci->top = L->top; }

+

+

+/* Ensure the stack has at least 'n' elements */

+#define api_checknelems(L,n)	api_check(L, (n) < (L->top - L->ci->func), \

+				  "not enough elements in the stack")

+

+

+/*

+** To reduce the overhead of returning from C functions, the presence of

+** to-be-closed variables in these functions is coded in the CallInfo's

+** field 'nresults', in a way that functions with no to-be-closed variables

+** with zero, one, or "all" wanted results have no overhead. Functions

+** with other number of wanted results, as well as functions with

+** variables to be closed, have an extra check.

+*/

+

+#define hastocloseCfunc(n)	((n) < LUA_MULTRET)

+

+#define codeNresults(n)		(-(n) - 3)

+

+#endif

--- /dev/null

+++ b/lauxlib.c

@@ -1,0 +1,1083 @@

+/*

+** $Id: lauxlib.c $

+** Auxiliary functions for building Lua libraries

+** See Copyright Notice in lua.h

+*/

+

+#define lauxlib_c

+#define LUA_LIB

+

+#include "lprefix.h"

+

+

+#include <errno.h>

+#include <stdarg.h>

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+

+

+/*

+** This file uses only the official API of Lua.

+** Any function declared here could be written as an application function.

+*/

+

+#include "lua.h"

+

+#include "lauxlib.h"

+

+

+#if !defined(MAX_SIZET)

+/* maximum value for size_t */

+#define MAX_SIZET	((size_t)(~(size_t)0))

+#endif

+

+

+/*

+** {======================================================

+** Traceback

+** =======================================================

+*/

+

+

+#define LEVELS1	10	/* size of the first part of the stack */

+#define LEVELS2	11	/* size of the second part of the stack */

+

+

+

+/*

+** Search for 'objidx' in table at index -1. ('objidx' must be an

+** absolute index.) Return 1 + string at top if it found a good name.

+*/

+static int findfield (lua_State *L, int objidx, int level) {

+  if (level == 0 || !lua_istable(L, -1))

+    return 0;  /* not found */

+  lua_pushnil(L);  /* start 'next' loop */

+  while (lua_next(L, -2)) {  /* for each pair in table */

+    if (lua_type(L, -2) == LUA_TSTRING) {  /* ignore non-string keys */

+      if (lua_rawequal(L, objidx, -1)) {  /* found object? */

+        lua_pop(L, 1);  /* remove value (but keep name) */

+        return 1;

+      }

+      else if (findfield(L, objidx, level - 1)) {  /* try recursively */

+        /* stack: lib_name, lib_table, field_name (top) */

+        lua_pushliteral(L, ".");  /* place '.' between the two names */

+        lua_replace(L, -3);  /* (in the slot occupied by table) */

+        lua_concat(L, 3);  /* lib_name.field_name */

+        return 1;

+      }

+    }

+    lua_pop(L, 1);  /* remove value */

+  }

+  return 0;  /* not found */

+}

+

+

+/*

+** Search for a name for a function in all loaded modules

+*/

+static int pushglobalfuncname (lua_State *L, lua_Debug *ar) {

+  int top = lua_gettop(L);

+  lua_getinfo(L, "f", ar);  /* push function */

+  lua_getfield(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE);

+  if (findfield(L, top + 1, 2)) {

+    const char *name = lua_tostring(L, -1);

+    if (strncmp(name, LUA_GNAME ".", 3) == 0) {  /* name start with '_G.'? */

+      lua_pushstring(L, name + 3);  /* push name without prefix */

+      lua_remove(L, -2);  /* remove original name */

+    }

+    lua_copy(L, -1, top + 1);  /* copy name to proper place */

+    lua_settop(L, top + 1);  /* remove table "loaded" and name copy */

+    return 1;

+  }

+  else {

+    lua_settop(L, top);  /* remove function and global table */

+    return 0;

+  }

+}

+

+

+static void pushfuncname (lua_State *L, lua_Debug *ar) {

+  if (pushglobalfuncname(L, ar)) {  /* try first a global name */

+    lua_pushfstring(L, "function '%s'", lua_tostring(L, -1));

+    lua_remove(L, -2);  /* remove name */

+  }

+  else if (*ar->namewhat != '\0')  /* is there a name from code? */

+    lua_pushfstring(L, "%s '%s'", ar->namewhat, ar->name);  /* use it */

+  else if (*ar->what == 'm')  /* main? */

+      lua_pushliteral(L, "main chunk");

+  else if (*ar->what != 'C')  /* for Lua functions, use <file:line> */

+    lua_pushfstring(L, "function <%s:%d>", ar->short_src, ar->linedefined);

+  else  /* nothing left... */

+    lua_pushliteral(L, "?");

+}

+

+

+static int lastlevel (lua_State *L) {

+  lua_Debug ar;

+  int li = 1, le = 1;

+  /* find an upper bound */

+  while (lua_getstack(L, le, &ar)) { li = le; le *= 2; }

+  /* do a binary search */

+  while (li < le) {

+    int m = (li + le)/2;

+    if (lua_getstack(L, m, &ar)) li = m + 1;

+    else le = m;

+  }

+  return le - 1;

+}

+

+

+LUALIB_API void luaL_traceback (lua_State *L, lua_State *L1,

+                                const char *msg, int level) {

+  luaL_Buffer b;

+  lua_Debug ar;

+  int last = lastlevel(L1);

+  int limit2show = (last - level > LEVELS1 + LEVELS2) ? LEVELS1 : -1;

+  luaL_buffinit(L, &b);

+  if (msg) {

+    luaL_addstring(&b, msg);

+    luaL_addchar(&b, '\n');

+  }

+  luaL_addstring(&b, "stack traceback:");

+  while (lua_getstack(L1, level++, &ar)) {

+    if (limit2show-- == 0) {  /* too many levels? */

+      int n = last - level - LEVELS2 + 1;  /* number of levels to skip */

+      lua_pushfstring(L, "\n\t...\t(skipping %d levels)", n);

+      luaL_addvalue(&b);  /* add warning about skip */

+      level += n;  /* and skip to last levels */

+    }

+    else {

+      lua_getinfo(L1, "Slnt", &ar);

+      if (ar.currentline <= 0)

+        lua_pushfstring(L, "\n\t%s: in ", ar.short_src);

+      else

+        lua_pushfstring(L, "\n\t%s:%d: in ", ar.short_src, ar.currentline);

+      luaL_addvalue(&b);

+      pushfuncname(L, &ar);

+      luaL_addvalue(&b);

+      if (ar.istailcall)

+        luaL_addstring(&b, "\n\t(...tail calls...)");

+    }

+  }

+  luaL_pushresult(&b);

+}

+

+/* }====================================================== */

+

+

+/*

+** {======================================================

+** Error-report functions

+** =======================================================

+*/

+

+LUALIB_API int luaL_argerror (lua_State *L, int arg, const char *extramsg) {

+  lua_Debug ar;

+  if (!lua_getstack(L, 0, &ar))  /* no stack frame? */

+    return luaL_error(L, "bad argument #%d (%s)", arg, extramsg);

+  lua_getinfo(L, "n", &ar);

+  if (strcmp(ar.namewhat, "method") == 0) {

+    arg--;  /* do not count 'self' */

+    if (arg == 0)  /* error is in the self argument itself? */

+      return luaL_error(L, "calling '%s' on bad self (%s)",

+                           ar.name, extramsg);

+  }

+  if (ar.name == NULL)

+    ar.name = (pushglobalfuncname(L, &ar)) ? lua_tostring(L, -1) : "?";

+  return luaL_error(L, "bad argument #%d to '%s' (%s)",

+                        arg, ar.name, extramsg);

+}

+

+

+int luaL_typeerror (lua_State *L, int arg, const char *tname) {

+  const char *msg;

+  const char *typearg;  /* name for the type of the actual argument */

+  if (luaL_getmetafield(L, arg, "__name") == LUA_TSTRING)

+    typearg = lua_tostring(L, -1);  /* use the given type name */

+  else if (lua_type(L, arg) == LUA_TLIGHTUSERDATA)

+    typearg = "light userdata";  /* special name for messages */

+  else

+    typearg = luaL_typename(L, arg);  /* standard name */

+  msg = lua_pushfstring(L, "%s expected, got %s", tname, typearg);

+  return luaL_argerror(L, arg, msg);

+}

+

+

+static void tag_error (lua_State *L, int arg, int tag) {

+  luaL_typeerror(L, arg, lua_typename(L, tag));

+}

+

+

+/*

+** The use of 'lua_pushfstring' ensures this function does not

+** need reserved stack space when called.

+*/

+LUALIB_API void luaL_where (lua_State *L, int level) {

+  lua_Debug ar;

+  if (lua_getstack(L, level, &ar)) {  /* check function at level */

+    lua_getinfo(L, "Sl", &ar);  /* get info about it */

+    if (ar.currentline > 0) {  /* is there info? */

+      lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline);

+      return;

+    }

+  }

+  lua_pushfstring(L, "");  /* else, no information available... */

+}

+

+

+/*

+** Again, the use of 'lua_pushvfstring' ensures this function does

+** not need reserved stack space when called. (At worst, it generates

+** an error with "stack overflow" instead of the given message.)

+*/

+LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) {

+  va_list argp;

+  va_start(argp, fmt);

+  luaL_where(L, 1);

+  lua_pushvfstring(L, fmt, argp);

+  va_end(argp);

+  lua_concat(L, 2);

+  return lua_error(L);

+}

+

+

+LUALIB_API int luaL_fileresult (lua_State *L, int stat, const char *fname) {

+  int en = errno;  /* calls to Lua API may change this value */

+  if (stat) {

+    lua_pushboolean(L, 1);

+    return 1;

+  }

+  else {

+    luaL_pushfail(L);

+    if (fname)

+      lua_pushfstring(L, "%s: %s", fname, strerror(en));

+    else

+      lua_pushstring(L, strerror(en));

+    lua_pushinteger(L, en);

+    return 3;

+  }

+}

+

+

+#if !defined(l_inspectstat)	/* { */

+

+#if defined(LUA_USE_POSIX)

+

+#include <sys/wait.h>

+

+/*

+** use appropriate macros to interpret 'pclose' return status

+*/

+#define l_inspectstat(stat,what)  \

+   if (WIFEXITED(stat)) { stat = WEXITSTATUS(stat); } \

+   else if (WIFSIGNALED(stat)) { stat = WTERMSIG(stat); what = "signal"; }

+

+#else

+

+#define l_inspectstat(stat,what)  /* no op */

+

+#endif

+

+#endif				/* } */

+

+

+LUALIB_API int luaL_execresult (lua_State *L, int stat) {

+  if (stat != 0 && errno != 0)  /* error with an 'errno'? */

+    return luaL_fileresult(L, 0, NULL);

+  else {

+    const char *what = "exit";  /* type of termination */

+    l_inspectstat(stat, what);  /* interpret result */

+    if (*what == 'e' && stat == 0)  /* successful termination? */

+      lua_pushboolean(L, 1);

+    else

+      luaL_pushfail(L);

+    lua_pushstring(L, what);

+    lua_pushinteger(L, stat);

+    return 3;  /* return true/fail,what,code */

+  }

+}

+

+/* }====================================================== */

+

+

+

+/*

+** {======================================================

+** Userdata's metatable manipulation

+** =======================================================

+*/

+

+LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {

+  if (luaL_getmetatable(L, tname) != LUA_TNIL)  /* name already in use? */

+    return 0;  /* leave previous value on top, but return 0 */

+  lua_pop(L, 1);

+  lua_createtable(L, 0, 2);  /* create metatable */

+  lua_pushstring(L, tname);

+  lua_setfield(L, -2, "__name");  /* metatable.__name = tname */

+  lua_pushvalue(L, -1);

+  lua_setfield(L, LUA_REGISTRYINDEX, tname);  /* registry.name = metatable */

+  return 1;

+}

+

+

+LUALIB_API void luaL_setmetatable (lua_State *L, const char *tname) {

+  luaL_getmetatable(L, tname);

+  lua_setmetatable(L, -2);

+}

+

+

+LUALIB_API void *luaL_testudata (lua_State *L, int ud, const char *tname) {

+  void *p = lua_touserdata(L, ud);

+  if (p != NULL) {  /* value is a userdata? */

+    if (lua_getmetatable(L, ud)) {  /* does it have a metatable? */

+      luaL_getmetatable(L, tname);  /* get correct metatable */

+      if (!lua_rawequal(L, -1, -2))  /* not the same? */

+        p = NULL;  /* value is a userdata with wrong metatable */

+      lua_pop(L, 2);  /* remove both metatables */

+      return p;

+    }

+  }

+  return NULL;  /* value is not a userdata with a metatable */

+}

+

+

+LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {

+  void *p = luaL_testudata(L, ud, tname);

+  luaL_argexpected(L, p != NULL, ud, tname);

+  return p;

+}

+

+/* }====================================================== */

+

+

+/*

+** {======================================================

+** Argument check functions

+** =======================================================

+*/

+

+LUALIB_API int luaL_checkoption (lua_State *L, int arg, const char *def,

+                                 const char *const lst[]) {

+  const char *name = (def) ? luaL_optstring(L, arg, def) :

+                             luaL_checkstring(L, arg);

+  int i;

+  for (i=0; lst[i]; i++)

+    if (strcmp(lst[i], name) == 0)

+      return i;

+  return luaL_argerror(L, arg,

+                       lua_pushfstring(L, "invalid option '%s'", name));

+}

+

+

+/*

+** Ensures the stack has at least 'space' extra slots, raising an error

+** if it cannot fulfill the request. (The error handling needs a few

+** extra slots to format the error message. In case of an error without

+** this extra space, Lua will generate the same 'stack overflow' error,

+** but without 'msg'.)

+*/

+LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *msg) {

+  if (!lua_checkstack(L, space)) {

+    if (msg)

+      luaL_error(L, "stack overflow (%s)", msg);

+    else

+      luaL_error(L, "stack overflow");

+  }

+}

+

+

+LUALIB_API void luaL_checktype (lua_State *L, int arg, int t) {

+  if (lua_type(L, arg) != t)

+    tag_error(L, arg, t);

+}

+

+

+LUALIB_API void luaL_checkany (lua_State *L, int arg) {

+  if (lua_type(L, arg) == LUA_TNONE)

+    luaL_argerror(L, arg, "value expected");

+}

+

+

+LUALIB_API const char *luaL_checklstring (lua_State *L, int arg, size_t *len) {

+  const char *s = lua_tolstring(L, arg, len);

+  if (!s) tag_error(L, arg, LUA_TSTRING);

+  return s;

+}

+

+

+LUALIB_API const char *luaL_optlstring (lua_State *L, int arg,

+                                        const char *def, size_t *len) {

+  if (lua_isnoneornil(L, arg)) {

+    if (len)

+      *len = (def ? strlen(def) : 0);

+    return def;

+  }

+  else return luaL_checklstring(L, arg, len);

+}

+

+

+LUALIB_API lua_Number luaL_checknumber (lua_State *L, int arg) {

+  int isnum;

+  lua_Number d = lua_tonumberx(L, arg, &isnum);

+  if (!isnum)

+    tag_error(L, arg, LUA_TNUMBER);

+  return d;

+}

+

+

+LUALIB_API lua_Number luaL_optnumber (lua_State *L, int arg, lua_Number def) {

+  return luaL_opt(L, luaL_checknumber, arg, def);

+}

+

+

+static void interror (lua_State *L, int arg) {

+  if (lua_isnumber(L, arg))

+    luaL_argerror(L, arg, "number has no integer representation");

+  else

+    tag_error(L, arg, LUA_TNUMBER);

+}

+

+

+LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int arg) {

+  int isnum;

+  lua_Integer d = lua_tointegerx(L, arg, &isnum);

+  if (!isnum) {

+    interror(L, arg);

+  }

+  return d;

+}

+

+

+LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int arg,

+                                                      lua_Integer def) {

+  return luaL_opt(L, luaL_checkinteger, arg, def);

+}

+

+/* }====================================================== */

+

+

+/*

+** {======================================================

+** Generic Buffer manipulation

+** =======================================================

+*/

+

+/* userdata to box arbitrary data */

+typedef struct UBox {

+  void *box;

+  size_t bsize;

+} UBox;

+

+

+static void *resizebox (lua_State *L, int idx, size_t newsize) {

+  void *ud;

+  lua_Alloc allocf = lua_getallocf(L, &ud);

+  UBox *box = (UBox *)lua_touserdata(L, idx);

+  void *temp = allocf(ud, box->box, box->bsize, newsize);

+  if (temp == NULL && newsize > 0) {  /* allocation error? */

+    lua_pushliteral(L, "not enough memory");

+    lua_error(L);  /* raise a memory error */

+  }

+  box->box = temp;

+  box->bsize = newsize;

+  return temp;

+}

+

+

+static int boxgc (lua_State *L) {

+  resizebox(L, 1, 0);

+  return 0;

+}

+

+

+static const luaL_Reg boxmt[] = {  /* box metamethods */

+  {"__gc", boxgc},

+  {"__close", boxgc},

+  {NULL, NULL}

+};

+

+

+static void newbox (lua_State *L) {

+  UBox *box = (UBox *)lua_newuserdatauv(L, sizeof(UBox), 0);

+  box->box = NULL;

+  box->bsize = 0;

+  if (luaL_newmetatable(L, "_UBOX*"))  /* creating metatable? */

+    luaL_setfuncs(L, boxmt, 0);  /* set its metamethods */

+  lua_setmetatable(L, -2);

+}

+

+

+/*

+** check whether buffer is using a userdata on the stack as a temporary

+** buffer

+*/

+#define buffonstack(B)	((B)->b != (B)->init.b)

+

+

+/*

+** Compute new size for buffer 'B', enough to accommodate extra 'sz'

+** bytes.

+*/

+static size_t newbuffsize (luaL_Buffer *B, size_t sz) {

+  size_t newsize = B->size * 2;  /* double buffer size */

+  if (MAX_SIZET - sz < B->n)  /* overflow in (B->n + sz)? */

+    return luaL_error(B->L, "buffer too large");

+  if (newsize < B->n + sz)  /* double is not big enough? */

+    newsize = B->n + sz;

+  return newsize;

+}

+

+

+/*

+** Returns a pointer to a free area with at least 'sz' bytes in buffer

+** 'B'. 'boxidx' is the relative position in the stack where the

+** buffer's box is or should be.

+*/

+static char *prepbuffsize (luaL_Buffer *B, size_t sz, int boxidx) {

+  if (B->size - B->n >= sz)  /* enough space? */

+    return B->b + B->n;

+  else {

+    lua_State *L = B->L;

+    char *newbuff;

+    size_t newsize = newbuffsize(B, sz);

+    /* create larger buffer */

+    if (buffonstack(B))  /* buffer already has a box? */

+      newbuff = (char *)resizebox(L, boxidx, newsize);  /* resize it */

+    else {  /* no box yet */

+      lua_pushnil(L);  /* reserve slot for final result */

+      newbox(L);  /* create a new box */

+      /* move box (and slot) to its intended position */

+      lua_rotate(L, boxidx - 1, 2);

+      lua_toclose(L, boxidx);

+      newbuff = (char *)resizebox(L, boxidx, newsize);

+      memcpy(newbuff, B->b, B->n * sizeof(char));  /* copy original content */

+    }

+    B->b = newbuff;

+    B->size = newsize;

+    return newbuff + B->n;

+  }

+}

+

+/*

+** returns a pointer to a free area with at least 'sz' bytes

+*/

+LUALIB_API char *luaL_prepbuffsize (luaL_Buffer *B, size_t sz) {

+  return prepbuffsize(B, sz, -1);

+}

+

+

+LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {

+  if (l > 0) {  /* avoid 'memcpy' when 's' can be NULL */

+    char *b = prepbuffsize(B, l, -1);

+    memcpy(b, s, l * sizeof(char));

+    luaL_addsize(B, l);

+  }

+}

+

+

+LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {

+  luaL_addlstring(B, s, strlen(s));

+}

+

+

+LUALIB_API void luaL_pushresult (luaL_Buffer *B) {

+  lua_State *L = B->L;

+  lua_pushlstring(L, B->b, B->n);

+  if (buffonstack(B)) {

+    lua_copy(L, -1, -3);  /* move string to reserved slot */

+    lua_pop(L, 2);  /* pop string and box (closing the box) */

+  }

+}

+

+

+LUALIB_API void luaL_pushresultsize (luaL_Buffer *B, size_t sz) {

+  luaL_addsize(B, sz);

+  luaL_pushresult(B);

+}

+

+

+/*

+** 'luaL_addvalue' is the only function in the Buffer system where the

+** box (if existent) is not on the top of the stack. So, instead of

+** calling 'luaL_addlstring', it replicates the code using -2 as the

+** last argument to 'prepbuffsize', signaling that the box is (or will

+** be) bellow the string being added to the buffer. (Box creation can

+** trigger an emergency GC, so we should not remove the string from the

+** stack before we have the space guaranteed.)

+*/

+LUALIB_API void luaL_addvalue (luaL_Buffer *B) {

+  lua_State *L = B->L;

+  size_t len;

+  const char *s = lua_tolstring(L, -1, &len);

+  char *b = prepbuffsize(B, len, -2);

+  memcpy(b, s, len * sizeof(char));

+  luaL_addsize(B, len);

+  lua_pop(L, 1);  /* pop string */

+}

+

+

+LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {

+  B->L = L;

+  B->b = B->init.b;

+  B->n = 0;

+  B->size = LUAL_BUFFERSIZE;

+}

+

+

+LUALIB_API char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz) {

+  luaL_buffinit(L, B);

+  return prepbuffsize(B, sz, -1);

+}

+

+/* }====================================================== */

+

+

+/*

+** {======================================================

+** Reference system

+** =======================================================

+*/

+

+/* index of free-list header */

+#define freelist	0

+

+

+LUALIB_API int luaL_ref (lua_State *L, int t) {

+  int ref;

+  if (lua_isnil(L, -1)) {

+    lua_pop(L, 1);  /* remove from stack */

+    return LUA_REFNIL;  /* 'nil' has a unique fixed reference */

+  }

+  t = lua_absindex(L, t);

+  lua_rawgeti(L, t, freelist);  /* get first free element */

+  ref = (int)lua_tointeger(L, -1);  /* ref = t[freelist] */

+  lua_pop(L, 1);  /* remove it from stack */

+  if (ref != 0) {  /* any free element? */

+    lua_rawgeti(L, t, ref);  /* remove it from list */

+    lua_rawseti(L, t, freelist);  /* (t[freelist] = t[ref]) */

+  }

+  else  /* no free elements */

+    ref = (int)lua_rawlen(L, t) + 1;  /* get a new reference */

+  lua_rawseti(L, t, ref);

+  return ref;

+}

+

+

+LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {

+  if (ref >= 0) {

+    t = lua_absindex(L, t);

+    lua_rawgeti(L, t, freelist);

+    lua_rawseti(L, t, ref);  /* t[ref] = t[freelist] */

+    lua_pushinteger(L, ref);

+    lua_rawseti(L, t, freelist);  /* t[freelist] = ref */

+  }

+}

+

+/* }====================================================== */

+

+

+/*

+** {======================================================

+** Load functions

+** =======================================================

+*/

+

+typedef struct LoadF {

+  int n;  /* number of pre-read characters */

+  FILE *f;  /* file being read */

+  char buff[BUFSIZ];  /* area for reading file */

+} LoadF;

+

+

+static const char *getF (lua_State *L, void *ud, size_t *size) {

+  LoadF *lf = (LoadF *)ud;

+  (void)L;  /* not used */

+  if (lf->n > 0) {  /* are there pre-read characters to be read? */

+    *size = lf->n;  /* return them (chars already in buffer) */

+    lf->n = 0;  /* no more pre-read characters */

+  }

+  else {  /* read a block from file */

+    /* 'fread' can return > 0 *and* set the EOF flag. If next call to

+       'getF' called 'fread', it might still wait for user input.

+       The next check avoids this problem. */

+    if (feof(lf->f)) return NULL;

+    *size = fread(lf->buff, 1, sizeof(lf->buff), lf->f);  /* read block */

+  }

+  return lf->buff;

+}

+

+

+static int errfile (lua_State *L, const char *what, int fnameindex) {

+  const char *serr = strerror(errno);

+  const char *filename = lua_tostring(L, fnameindex) + 1;

+  lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr);

+  lua_remove(L, fnameindex);

+  return LUA_ERRFILE;

+}

+

+

+static int skipBOM (LoadF *lf) {

+  const char *p = "\xEF\xBB\xBF";  /* UTF-8 BOM mark */

+  int c;

+  lf->n = 0;

+  do {

+    c = getc(lf->f);

+    if (c == EOF || c != *(const unsigned char *)p++) return c;

+    lf->buff[lf->n++] = c;  /* to be read by the parser */

+  } while (*p != '\0');

+  lf->n = 0;  /* prefix matched; discard it */

+  return getc(lf->f);  /* return next character */

+}

+

+

+/*

+** reads the first character of file 'f' and skips an optional BOM mark

+** in its beginning plus its first line if it starts with '#'. Returns

+** true if it skipped the first line.  In any case, '*cp' has the

+** first "valid" character of the file (after the optional BOM and

+** a first-line comment).

+*/

+static int skipcomment (LoadF *lf, int *cp) {

+  int c = *cp = skipBOM(lf);

+  if (c == '#') {  /* first line is a comment (Unix exec. file)? */

+    do {  /* skip first line */

+      c = getc(lf->f);

+    } while (c != EOF && c != '\n');

+    *cp = getc(lf->f);  /* skip end-of-line, if present */

+    return 1;  /* there was a comment */

+  }

+  else return 0;  /* no comment */

+}

+

+

+LUALIB_API int luaL_loadfilex (lua_State *L, const char *filename,

+                                             const char *mode) {

+  LoadF lf;

+  int status, readstatus;

+  int c;

+  int fnameindex = lua_gettop(L) + 1;  /* index of filename on the stack */

+  if (filename == NULL) {

+    lua_pushliteral(L, "=stdin");

+    lf.f = stdin;

+  }

+  else {

+    lua_pushfstring(L, "@%s", filename);

+    lf.f = fopen(filename, "r");

+    if (lf.f == NULL) return errfile(L, "open", fnameindex);

+  }

+  if (skipcomment(&lf, &c))  /* read initial portion */

+    lf.buff[lf.n++] = '\n';  /* add line to correct line numbers */

+  if (c == LUA_SIGNATURE[0] && filename) {  /* binary file? */

+    lf.f = freopen(filename, "rb", lf.f);  /* reopen in binary mode */

+    if (lf.f == NULL) return errfile(L, "reopen", fnameindex);

+    skipcomment(&lf, &c);  /* re-read initial portion */

+  }

+  if (c != EOF)

+    lf.buff[lf.n++] = c;  /* 'c' is the first character of the stream */

+  status = lua_load(L, getF, &lf, lua_tostring(L, -1), mode);

+  readstatus = ferror(lf.f);

+  if (filename) fclose(lf.f);  /* close file (even in case of errors) */

+  if (readstatus) {

+    lua_settop(L, fnameindex);  /* ignore results from 'lua_load' */

+    return errfile(L, "read", fnameindex);

+  }

+  lua_remove(L, fnameindex);

+  return status;

+}

+

+

+typedef struct LoadS {

+  const char *s;

+  size_t size;

+} LoadS;

+

+

+static const char *getS (lua_State *L, void *ud, size_t *size) {

+  LoadS *ls = (LoadS *)ud;

+  (void)L;  /* not used */

+  if (ls->size == 0) return NULL;

+  *size = ls->size;

+  ls->size = 0;

+  return ls->s;

+}

+

+

+LUALIB_API int luaL_loadbufferx (lua_State *L, const char *buff, size_t size,

+                                 const char *name, const char *mode) {

+  LoadS ls;

+  ls.s = buff;

+  ls.size = size;

+  return lua_load(L, getS, &ls, name, mode);

+}

+

+

+LUALIB_API int luaL_loadstring (lua_State *L, const char *s) {

+  return luaL_loadbuffer(L, s, strlen(s), s);

+}

+

+/* }====================================================== */

+

+

+

+LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {

+  if (!lua_getmetatable(L, obj))  /* no metatable? */

+    return LUA_TNIL;

+  else {

+    int tt;

+    lua_pushstring(L, event);

+    tt = lua_rawget(L, -2);

+    if (tt == LUA_TNIL)  /* is metafield nil? */

+      lua_pop(L, 2);  /* remove metatable and metafield */

+    else

+      lua_remove(L, -2);  /* remove only metatable */

+    return tt;  /* return metafield type */

+  }

+}

+

+

+LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {

+  obj = lua_absindex(L, obj);

+  if (luaL_getmetafield(L, obj, event) == LUA_TNIL)  /* no metafield? */

+    return 0;

+  lua_pushvalue(L, obj);

+  lua_call(L, 1, 1);

+  return 1;

+}

+

+

+LUALIB_API lua_Integer luaL_len (lua_State *L, int idx) {

+  lua_Integer l;

+  int isnum;

+  lua_len(L, idx);

+  l = lua_tointegerx(L, -1, &isnum);

+  if (!isnum)

+    luaL_error(L, "object length is not an integer");

+  lua_pop(L, 1);  /* remove object */

+  return l;

+}

+

+

+LUALIB_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len) {

+  if (luaL_callmeta(L, idx, "__tostring")) {  /* metafield? */

+    if (!lua_isstring(L, -1))

+      luaL_error(L, "'__tostring' must return a string");

+  }

+  else {

+    switch (lua_type(L, idx)) {

+      case LUA_TNUMBER: {

+        if (lua_isinteger(L, idx))

+          lua_pushfstring(L, "%I", (LUAI_UACINT)lua_tointeger(L, idx));

+        else

+          lua_pushfstring(L, "%f", (LUAI_UACNUMBER)lua_tonumber(L, idx));

+        break;

+      }

+      case LUA_TSTRING:

+        lua_pushvalue(L, idx);

+        break;

+      case LUA_TBOOLEAN:

+        lua_pushstring(L, (lua_toboolean(L, idx) ? "true" : "false"));

+        break;

+      case LUA_TNIL:

+        lua_pushliteral(L, "nil");

+        break;

+      default: {

+        int tt = luaL_getmetafield(L, idx, "__name");  /* try name */

+        const char *kind = (tt == LUA_TSTRING) ? lua_tostring(L, -1) :

+                                                 luaL_typename(L, idx);

+        lua_pushfstring(L, "%s: %p", kind, lua_topointer(L, idx));

+        if (tt != LUA_TNIL)

+          lua_remove(L, -2);  /* remove '__name' */

+        break;

+      }

+    }

+  }

+  return lua_tolstring(L, -1, len);

+}

+

+

+/*

+** set functions from list 'l' into table at top - 'nup'; each

+** function gets the 'nup' elements at the top as upvalues.

+** Returns with only the table at the stack.

+*/

+LUALIB_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {

+  luaL_checkstack(L, nup, "too many upvalues");

+  for (; l->name != NULL; l++) {  /* fill the table with given functions */

+    if (l->func == NULL)  /* place holder? */

+      lua_pushboolean(L, 0);

+    else {

+      int i;

+      for (i = 0; i < nup; i++)  /* copy upvalues to the top */

+        lua_pushvalue(L, -nup);

+      lua_pushcclosure(L, l->func, nup);  /* closure with those upvalues */

+    }

+    lua_setfield(L, -(nup + 2), l->name);

+  }

+  lua_pop(L, nup);  /* remove upvalues */

+}

+

+

+/*

+** ensure that stack[idx][fname] has a table and push that table

+** into the stack

+*/

+LUALIB_API int luaL_getsubtable (lua_State *L, int idx, const char *fname) {

+  if (lua_getfield(L, idx, fname) == LUA_TTABLE)

+    return 1;  /* table already there */

+  else {

+    lua_pop(L, 1);  /* remove previous result */

+    idx = lua_absindex(L, idx);

+    lua_newtable(L);

+    lua_pushvalue(L, -1);  /* copy to be left at top */

+    lua_setfield(L, idx, fname);  /* assign new table to field */

+    return 0;  /* false, because did not find table there */

+  }

+}

+

+

+/*

+** Stripped-down 'require': After checking "loaded" table, calls 'openf'

+** to open a module, registers the result in 'package.loaded' table and,

+** if 'glb' is true, also registers the result in the global table.

+** Leaves resulting module on the top.

+*/

+LUALIB_API void luaL_requiref (lua_State *L, const char *modname,

+                               lua_CFunction openf, int glb) {

+  luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE);

+  lua_getfield(L, -1, modname);  /* LOADED[modname] */

+  if (!lua_toboolean(L, -1)) {  /* package not already loaded? */

+    lua_pop(L, 1);  /* remove field */

+    lua_pushcfunction(L, openf);

+    lua_pushstring(L, modname);  /* argument to open function */

+    lua_call(L, 1, 1);  /* call 'openf' to open module */

+    lua_pushvalue(L, -1);  /* make copy of module (call result) */

+    lua_setfield(L, -3, modname);  /* LOADED[modname] = module */

+  }

+  lua_remove(L, -2);  /* remove LOADED table */

+  if (glb) {

+    lua_pushvalue(L, -1);  /* copy of module */

+    lua_setglobal(L, modname);  /* _G[modname] = module */

+  }

+}

+

+

+LUALIB_API void luaL_addgsub (luaL_Buffer *b, const char *s,

+                                     const char *p, const char *r) {

+  const char *wild;

+  size_t l = strlen(p);

+  while ((wild = strstr(s, p)) != NULL) {

+    luaL_addlstring(b, s, wild - s);  /* push prefix */

+    luaL_addstring(b, r);  /* push replacement in place of pattern */

+    s = wild + l;  /* continue after 'p' */

+  }

+  luaL_addstring(b, s);  /* push last suffix */

+}

+

+

+LUALIB_API const char *luaL_gsub (lua_State *L, const char *s,

+                                  const char *p, const char *r) {

+  luaL_Buffer b;

+  luaL_buffinit(L, &b);

+  luaL_addgsub(&b, s, p, r);

+  luaL_pushresult(&b);

+  return lua_tostring(L, -1);

+}

+

+

+static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {

+  (void)ud; (void)osize;  /* not used */

+  if (nsize == 0) {

+    free(ptr);

+    return NULL;

+  }

+  else

+    return realloc(ptr, nsize);

+}

+

+

+static int panic (lua_State *L) {

+  const char *msg = lua_tostring(L, -1);

+  if (msg == NULL) msg = "error object is not a string";

+  lua_writestringerror("PANIC: unprotected error in call to Lua API (%s)\n",

+                        msg);

+  return 0;  /* return to Lua to abort */

+}

+

+

+/*

+** Warning functions:

+** warnfoff: warning system is off

+** warnfon: ready to start a new message

+** warnfcont: previous message is to be continued

+*/

+static void warnfoff (void *ud, const char *message, int tocont);

+static void warnfon (void *ud, const char *message, int tocont);

+static void warnfcont (void *ud, const char *message, int tocont);

+

+

+/*

+** Check whether message is a control message. If so, execute the

+** control or ignore it if unknown.

+*/

+static int checkcontrol (lua_State *L, const char *message, int tocont) {

+  if (tocont || *(message++) != '@')  /* not a control message? */

+    return 0;

+  else {

+    if (strcmp(message, "off") == 0)

+      lua_setwarnf(L, warnfoff, L);  /* turn warnings off */

+    else if (strcmp(message, "on") == 0)

+      lua_setwarnf(L, warnfon, L);   /* turn warnings on */

+    return 1;  /* it was a control message */

+  }

+}

+

+

+static void warnfoff (void *ud, const char *message, int tocont) {

+  checkcontrol((lua_State *)ud, message, tocont);

+}

+

+

+/*

+** Writes the message and handle 'tocont', finishing the message

+** if needed and setting the next warn function.

+*/

+static void warnfcont (void *ud, const char *message, int tocont) {

+  lua_State *L = (lua_State *)ud;

+  lua_writestringerror("%s", message);  /* write message */

+  if (tocont)  /* not the last part? */

+    lua_setwarnf(L, warnfcont, L);  /* to be continued */

+  else {  /* last part */

+    lua_writestringerror("%s", "\n");  /* finish message with end-of-line */

+    lua_setwarnf(L, warnfon, L);  /* next call is a new message */

+  }

+}

+

+

+static void warnfon (void *ud, const char *message, int tocont) {

+  if (checkcontrol((lua_State *)ud, message, tocont))  /* control message? */

+    return;  /* nothing else to be done */

+  lua_writestringerror("%s", "Lua warning: ");  /* start a new warning */

+  warnfcont(ud, message, tocont);  /* finish processing */

+}

+

+

+LUALIB_API lua_State *luaL_newstate (void) {

+  lua_State *L = lua_newstate(l_alloc, NULL);

+  if (L) {

+    lua_atpanic(L, &panic);

+    lua_setwarnf(L, warnfoff, L);  /* default is warnings off */

+  }

+  return L;

+}

+

+

+LUALIB_API void luaL_checkversion_ (lua_State *L, lua_Number ver, size_t sz) {

+  lua_Number v = lua_version(L);

+  if (sz != LUAL_NUMSIZES)  /* check numeric types */

+    luaL_error(L, "core and library have incompatible numeric types");

+  else if (v != ver)

+    luaL_error(L, "version mismatch: app. needs %f, Lua core provides %f",

+                  (LUAI_UACNUMBER)ver, (LUAI_UACNUMBER)v);

+}

+

--- /dev/null

+++ b/lauxlib.h

@@ -1,0 +1,276 @@

+/*

+** $Id: lauxlib.h $

+** Auxiliary functions for building Lua libraries

+** See Copyright Notice in lua.h

+*/

+

+

+#ifndef lauxlib_h

+#define lauxlib_h

+

+

+#include <stddef.h>

+#include <stdio.h>

+

+#include "lua.h"

+

+

+/* global table */

+#define LUA_GNAME	"_G"

+

+

+typedef struct luaL_Buffer luaL_Buffer;

+

+

+/* extra error code for 'luaL_loadfilex' */

+#define LUA_ERRFILE     (LUA_ERRERR+1)

+

+

+/* key, in the registry, for table of loaded modules */

+#define LUA_LOADED_TABLE	"_LOADED"

+

+

+/* key, in the registry, for table of preloaded loaders */

+#define LUA_PRELOAD_TABLE	"_PRELOAD"

+

+

+typedef struct luaL_Reg {

+  const char *name;

+  lua_CFunction func;

+} luaL_Reg;

+

+

+#define LUAL_NUMSIZES	(sizeof(lua_Integer)*16 + sizeof(lua_Number))

+

+LUALIB_API void (luaL_checkversion_) (lua_State *L, lua_Number ver, size_t sz);

+#define luaL_checkversion(L)  \

+	  luaL_checkversion_(L, LUA_VERSION_NUM, LUAL_NUMSIZES)

+

+LUALIB_API int (luaL_getmetafield) (lua_State *L, int obj, const char *e);

+LUALIB_API int (luaL_callmeta) (lua_State *L, int obj, const char *e);

+LUALIB_API const char *(luaL_tolstring) (lua_State *L, int idx, size_t *len);

+LUALIB_API int (luaL_argerror) (lua_State *L, int arg, const char *extramsg);

+LUALIB_API int (luaL_typeerror) (lua_State *L, int arg, const char *tname);

+LUALIB_API const char *(luaL_checklstring) (lua_State *L, int arg,

+                                                          size_t *l);

+LUALIB_API const char *(luaL_optlstring) (lua_State *L, int arg,

+                                          const char *def, size_t *l);

+LUALIB_API lua_Number (luaL_checknumber) (lua_State *L, int arg);

+LUALIB_API lua_Number (luaL_optnumber) (lua_State *L, int arg, lua_Number def);

+

+LUALIB_API lua_Integer (luaL_checkinteger) (lua_State *L, int arg);

+LUALIB_API lua_Integer (luaL_optinteger) (lua_State *L, int arg,

+                                          lua_Integer def);

+

+LUALIB_API void (luaL_checkstack) (lua_State *L, int sz, const char *msg);

+LUALIB_API void (luaL_checktype) (lua_State *L, int arg, int t);

+LUALIB_API void (luaL_checkany) (lua_State *L, int arg);

+

+LUALIB_API int   (luaL_newmetatable) (lua_State *L, const char *tname);

+LUALIB_API void  (luaL_setmetatable) (lua_State *L, const char *tname);

+LUALIB_API void *(luaL_testudata) (lua_State *L, int ud, const char *tname);

+LUALIB_API void *(luaL_checkudata) (lua_State *L, int ud, const char *tname);

+

+LUALIB_API void (luaL_where) (lua_State *L, int lvl);

+LUALIB_API int (luaL_error) (lua_State *L, const char *fmt, ...);

+

+LUALIB_API int (luaL_checkoption) (lua_State *L, int arg, const char *def,

+                                   const char *const lst[]);

+

+LUALIB_API int (luaL_fileresult) (lua_State *L, int stat, const char *fname);

+LUALIB_API int (luaL_execresult) (lua_State *L, int stat);

+

+

+/* predefined references */

+#define LUA_NOREF       (-2)

+#define LUA_REFNIL      (-1)

+

+LUALIB_API int (luaL_ref) (lua_State *L, int t);

+LUALIB_API void (luaL_unref) (lua_State *L, int t, int ref);

+

+LUALIB_API int (luaL_loadfilex) (lua_State *L, const char *filename,

+                                               const char *mode);

+

+#define luaL_loadfile(L,f)	luaL_loadfilex(L,f,NULL)

+

+LUALIB_API int (luaL_loadbufferx) (lua_State *L, const char *buff, size_t sz,

+                                   const char *name, const char *mode);

+LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s);

+

+LUALIB_API lua_State *(luaL_newstate) (void);

+

+LUALIB_API lua_Integer (luaL_len) (lua_State *L, int idx);

+

+LUALIB_API void luaL_addgsub (luaL_Buffer *b, const char *s,

+                                     const char *p, const char *r);

+LUALIB_API const char *(luaL_gsub) (lua_State *L, const char *s,

+                                    const char *p, const char *r);

+

+LUALIB_API void (luaL_setfuncs) (lua_State *L, const luaL_Reg *l, int nup);

+

+LUALIB_API int (luaL_getsubtable) (lua_State *L, int idx, const char *fname);

+

+LUALIB_API void (luaL_traceback) (lua_State *L, lua_State *L1,

+                                  const char *msg, int level);

+

+LUALIB_API void (luaL_requiref) (lua_State *L, const char *modname,

+                                 lua_CFunction openf, int glb);

+

+/*

+** ===============================================================

+** some useful macros

+** ===============================================================

+*/

+

+

+#define luaL_newlibtable(L,l)	\

+  lua_createtable(L, 0, sizeof(l)/sizeof((l)[0]) - 1)

+

+#define luaL_newlib(L,l)  \

+  (luaL_checkversion(L), luaL_newlibtable(L,l), luaL_setfuncs(L,l,0))

+

+#define luaL_argcheck(L, cond,arg,extramsg)	\

+		((void)((cond) || luaL_argerror(L, (arg), (extramsg))))

+

+#define luaL_argexpected(L,cond,arg,tname)	\

+		((void)((cond) || luaL_typeerror(L, (arg), (tname))))

+

+#define luaL_checkstring(L,n)	(luaL_checklstring(L, (n), NULL))

+#define luaL_optstring(L,n,d)	(luaL_optlstring(L, (n), (d), NULL))

+

+#define luaL_typename(L,i)	lua_typename(L, lua_type(L,(i)))

+

+#define luaL_dofile(L, fn) \

+	(luaL_loadfile(L, fn) || lua_pcall(L, 0, LUA_MULTRET, 0))

+

+#define luaL_dostring(L, s) \

+	(luaL_loadstring(L, s) || lua_pcall(L, 0, LUA_MULTRET, 0))

+

+#define luaL_getmetatable(L,n)	(lua_getfield(L, LUA_REGISTRYINDEX, (n)))

+

+#define luaL_opt(L,f,n,d)	(lua_isnoneornil(L,(n)) ? (d) : f(L,(n)))

+

+#define luaL_loadbuffer(L,s,sz,n)	luaL_loadbufferx(L,s,sz,n,NULL)

+

+

+/* push the value used to represent failure/error */

+#define luaL_pushfail(L)	lua_pushnil(L)

+

+

+/*

+** {======================================================

+** Generic Buffer manipulation

+** =======================================================

+*/

+

+struct luaL_Buffer {

+  char *b;  /* buffer address */

+  size_t size;  /* buffer size */

+  size_t n;  /* number of characters in buffer */

+  lua_State *L;

+  union {

+    LUAI_MAXALIGN;  /* ensure maximum alignment for buffer */

+    char b[LUAL_BUFFERSIZE];  /* initial buffer */

+  } init;

+};

+

+

+#define luaL_bufflen(bf)	((bf)->n)

+#define luaL_buffaddr(bf)	((bf)->b)

+

+

+#define luaL_addchar(B,c) \

+  ((void)((B)->n < (B)->size || luaL_prepbuffsize((B), 1)), \

+   ((B)->b[(B)->n++] = (c)))

+

+#define luaL_addsize(B,s)	((B)->n += (s))

+

+#define luaL_buffsub(B,s)	((B)->n -= (s))

+

+LUALIB_API void (luaL_buffinit) (lua_State *L, luaL_Buffer *B);

+LUALIB_API char *(luaL_prepbuffsize) (luaL_Buffer *B, size_t sz);

+LUALIB_API void (luaL_addlstring) (luaL_Buffer *B, const char *s, size_t l);

+LUALIB_API void (luaL_addstring) (luaL_Buffer *B, const char *s);

+LUALIB_API void (luaL_addvalue) (luaL_Buffer *B);

+LUALIB_API void (luaL_pushresult) (luaL_Buffer *B);

+LUALIB_API void (luaL_pushresultsize) (luaL_Buffer *B, size_t sz);

+LUALIB_API char *(luaL_buffinitsize) (lua_State *L, luaL_Buffer *B, size_t sz);

+

+#define luaL_prepbuffer(B)	luaL_prepbuffsize(B, LUAL_BUFFERSIZE)

+

+/* }====================================================== */

+

+

+

+/*

+** {======================================================

+** File handles for IO library

+** =======================================================

+*/

+

+/*

+** A file handle is a userdata with metatable 'LUA_FILEHANDLE' and

+** initial structure 'luaL_Stream' (it may contain other fields

+** after that initial structure).

+*/

+

+#define LUA_FILEHANDLE          "FILE*"

+

+

+typedef struct luaL_Stream {

+  FILE *f;  /* stream (NULL for incompletely created streams) */

+  lua_CFunction closef;  /* to close stream (NULL for closed streams) */

+} luaL_Stream;

+

+/* }====================================================== */

+

+/*

+** {==================================================================

+** "Abstraction Layer" for basic report of messages and errors

+** ===================================================================

+*/

+

+/* print a string */

+#if !defined(lua_writestring)

+#define lua_writestring(s,l)   fwrite((s), sizeof(char), (l), stdout)

+#endif

+

+/* print a newline and flush the output */

+#if !defined(lua_writeline)

+#define lua_writeline()        (lua_writestring("\n", 1), fflush(stdout))

+#endif

+

+/* print an error message */

+#if !defined(lua_writestringerror)

+#define lua_writestringerror(s,p) \

+        (fprintf(stderr, (s), (p)), fflush(stderr))

+#endif

+

+/* }================================================================== */

+

+

+/*

+** {============================================================

+** Compatibility with deprecated conversions

+** =============================================================

+*/

+#if defined(LUA_COMPAT_APIINTCASTS)

+

+#define luaL_checkunsigned(L,a)	((lua_Unsigned)luaL_checkinteger(L,a))

+#define luaL_optunsigned(L,a,d)	\

+	((lua_Unsigned)luaL_optinteger(L,a,(lua_Integer)(d)))

+

+#define luaL_checkint(L,n)	((int)luaL_checkinteger(L, (n)))

+#define luaL_optint(L,n,d)	((int)luaL_optinteger(L, (n), (d)))

+

+#define luaL_checklong(L,n)	((long)luaL_checkinteger(L, (n)))

+#define luaL_optlong(L,n,d)	((long)luaL_optinteger(L, (n), (d)))

+

+#endif

+/* }============================================================ */

+

+

+

+#endif

+

+

--- /dev/null

+++ b/lbaselib.c

@@ -1,0 +1,527 @@

+/*

+** $Id: lbaselib.c $

+** Basic library

+** See Copyright Notice in lua.h

+*/

+

+#define lbaselib_c

+#define LUA_LIB

+

+#include "lprefix.h"

+

+

+#include <ctype.h>

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "lauxlib.h"

+#include "lualib.h"

+

+

+static int luaB_print (lua_State *L) {

+  int n = lua_gettop(L);  /* number of arguments */

+  int i;

+  for (i = 1; i <= n; i++) {  /* for each argument */

+    size_t l;

+    const char *s = luaL_tolstring(L, i, &l);  /* convert it to string */

+    if (i > 1)  /* not the first element? */

+      lua_writestring("\t", 1);  /* add a tab before it */

+    lua_writestring(s, l);  /* print it */

+    lua_pop(L, 1);  /* pop result */

+  }

+  lua_writeline();

+  return 0;

+}

+

+

+/*

+** Creates a warning with all given arguments.

+** Check first for errors; otherwise an error may interrupt

+** the composition of a warning, leaving it unfinished.

+*/

+static int luaB_warn (lua_State *L) {

+  int n = lua_gettop(L);  /* number of arguments */

+  int i;

+  luaL_checkstring(L, 1);  /* at least one argument */

+  for (i = 2; i <= n; i++)

+    luaL_checkstring(L, i);  /* make sure all arguments are strings */

+  for (i = 1; i < n; i++)  /* compose warning */

+    lua_warning(L, lua_tostring(L, i), 1);

+  lua_warning(L, lua_tostring(L, n), 0);  /* close warning */

+  return 0;

+}

+

+

+#define SPACECHARS	" \f\n\r\t\v"

+

+static const char *b_str2int (const char *s, int base, lua_Integer *pn) {

+  lua_Unsigned n = 0;

+  int neg = 0;

+  s += strspn(s, SPACECHARS);  /* skip initial spaces */

+  if (*s == '-') { s++; neg = 1; }  /* handle sign */

+  else if (*s == '+') s++;

+  if (!isalnum((unsigned char)*s))  /* no digit? */

+    return NULL;

+  do {

+    int digit = (isdigit((unsigned char)*s)) ? *s - '0'

+                   : (toupper((unsigned char)*s) - 'A') + 10;

+    if (digit >= base) return NULL;  /* invalid numeral */

+    n = n * base + digit;

+    s++;

+  } while (isalnum((unsigned char)*s));

+  s += strspn(s, SPACECHARS);  /* skip trailing spaces */

+  *pn = (lua_Integer)((neg) ? (0u - n) : n);

+  return s;

+}

+

+

+static int luaB_tonumber (lua_State *L) {

+  if (lua_isnoneornil(L, 2)) {  /* standard conversion? */

+    if (lua_type(L, 1) == LUA_TNUMBER) {  /* already a number? */

+      lua_settop(L, 1);  /* yes; return it */

+      return 1;

+    }

+    else {

+      size_t l;

+      const char *s = lua_tolstring(L, 1, &l);

+      if (s != NULL && lua_stringtonumber(L, s) == l + 1)

+        return 1;  /* successful conversion to number */

+      /* else not a number */

+      luaL_checkany(L, 1);  /* (but there must be some parameter) */

+    }

+  }

+  else {

+    size_t l;

+    const char *s;

+    lua_Integer n = 0;  /* to avoid warnings */

+    lua_Integer base = luaL_checkinteger(L, 2);

+    luaL_checktype(L, 1, LUA_TSTRING);  /* no numbers as strings */

+    s = lua_tolstring(L, 1, &l);

+    luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");

+    if (b_str2int(s, (int)base, &n) == s + l) {

+      lua_pushinteger(L, n);

+      return 1;

+    }  /* else not a number */

+  }  /* else not a number */

+  luaL_pushfail(L);  /* not a number */

+  return 1;

+}

+

+

+static int luaB_error (lua_State *L) {

+  int level = (int)luaL_optinteger(L, 2, 1);

+  lua_settop(L, 1);

+  if (lua_type(L, 1) == LUA_TSTRING && level > 0) {

+    luaL_where(L, level);   /* add extra information */

+    lua_pushvalue(L, 1);

+    lua_concat(L, 2);

+  }

+  return lua_error(L);

+}

+

+

+static int luaB_getmetatable (lua_State *L) {

+  luaL_checkany(L, 1);

+  if (!lua_getmetatable(L, 1)) {

+    lua_pushnil(L);

+    return 1;  /* no metatable */

+  }

+  luaL_getmetafield(L, 1, "__metatable");

+  return 1;  /* returns either __metatable field (if present) or metatable */

+}

+

+

+static int luaB_setmetatable (lua_State *L) {

+  int t = lua_type(L, 2);

+  luaL_checktype(L, 1, LUA_TTABLE);

+  luaL_argexpected(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table");

+  if (luaL_getmetafield(L, 1, "__metatable") != LUA_TNIL)

+    return luaL_error(L, "cannot change a protected metatable");

+  lua_settop(L, 2);

+  lua_setmetatable(L, 1);

+  return 1;

+}

+

+

+static int luaB_rawequal (lua_State *L) {

+  luaL_checkany(L, 1);

+  luaL_checkany(L, 2);

+  lua_pushboolean(L, lua_rawequal(L, 1, 2));

+  return 1;

+}

+

+

+static int luaB_rawlen (lua_State *L) {

+  int t = lua_type(L, 1);

+  luaL_argexpected(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,

+                      "table or string");

+  lua_pushinteger(L, lua_rawlen(L, 1));

+  return 1;

+}

+

+

+static int luaB_rawget (lua_State *L) {

+  luaL_checktype(L, 1, LUA_TTABLE);

+  luaL_checkany(L, 2);

+  lua_settop(L, 2);

+  lua_rawget(L, 1);

+  return 1;

+}

+

+static int luaB_rawset (lua_State *L) {

+  luaL_checktype(L, 1, LUA_TTABLE);

+  luaL_checkany(L, 2);

+  luaL_checkany(L, 3);

+  lua_settop(L, 3);

+  lua_rawset(L, 1);

+  return 1;

+}

+

+

+static int pushmode (lua_State *L, int oldmode) {

+  lua_pushstring(L, (oldmode == LUA_GCINC) ? "incremental" : "generational");

+  return 1;

+}

+

+

+static int luaB_collectgarbage (lua_State *L) {

+  static const char *const opts[] = {"stop", "restart", "collect",

+    "count", "step", "setpause", "setstepmul",

+    "isrunning", "generational", "incremental", NULL};

+  static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,

+    LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,

+    LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC};

+  int o = optsnum[luaL_checkoption(L, 1, "collect", opts)];

+  switch (o) {

+    case LUA_GCCOUNT: {

+      int k = lua_gc(L, o);

+      int b = lua_gc(L, LUA_GCCOUNTB);

+      lua_pushnumber(L, (lua_Number)k + ((lua_Number)b/1024));

+      return 1;

+    }

+    case LUA_GCSTEP: {

+      int step = (int)luaL_optinteger(L, 2, 0);

+      int res = lua_gc(L, o, step);

+      lua_pushboolean(L, res);

+      return 1;

+    }

+    case LUA_GCSETPAUSE:

+    case LUA_GCSETSTEPMUL: {

+      int p = (int)luaL_optinteger(L, 2, 0);

+      int previous = lua_gc(L, o, p);

+      lua_pushinteger(L, previous);

+      return 1;

+    }

+    case LUA_GCISRUNNING: {

+      int res = lua_gc(L, o);

+      lua_pushboolean(L, res);

+      return 1;

+    }

+    case LUA_GCGEN: {

+      int minormul = (int)luaL_optinteger(L, 2, 0);

+      int majormul = (int)luaL_optinteger(L, 3, 0);

+      return pushmode(L, lua_gc(L, o, minormul, majormul));

+    }

+    case LUA_GCINC: {

+      int pause = (int)luaL_optinteger(L, 2, 0);

+      int stepmul = (int)luaL_optinteger(L, 3, 0);

+      int stepsize = (int)luaL_optinteger(L, 4, 0);

+      return pushmode(L, lua_gc(L, o, pause, stepmul, stepsize));

+    }

+    default: {

+      int res = lua_gc(L, o);

+      lua_pushinteger(L, res);

+      return 1;

+    }

+  }

+}

+

+

+static int luaB_type (lua_State *L) {

+  int t = lua_type(L, 1);

+  luaL_argcheck(L, t != LUA_TNONE, 1, "value expected");

+  lua_pushstring(L, lua_typename(L, t));

+  return 1;

+}

+

+

+static int luaB_next (lua_State *L) {

+  luaL_checktype(L, 1, LUA_TTABLE);

+  lua_settop(L, 2);  /* create a 2nd argument if there isn't one */

+  if (lua_next(L, 1))

+    return 2;

+  else {

+    lua_pushnil(L);

+    return 1;

+  }

+}

+

+

+static int luaB_pairs (lua_State *L) {

+  luaL_checkany(L, 1);

+  if (luaL_getmetafield(L, 1, "__pairs") == LUA_TNIL) {  /* no metamethod? */

+    lua_pushcfunction(L, luaB_next);  /* will return generator, */

+    lua_pushvalue(L, 1);  /* state, */

+    lua_pushnil(L);  /* and initial value */

+  }

+  else {

+    lua_pushvalue(L, 1);  /* argument 'self' to metamethod */

+    lua_call(L, 1, 3);  /* get 3 values from metamethod */

+  }

+  return 3;

+}

+

+

+/*

+** Traversal function for 'ipairs'

+*/

+static int ipairsaux (lua_State *L) {

+  lua_Integer i = luaL_checkinteger(L, 2) + 1;

+  lua_pushinteger(L, i);

+  return (lua_geti(L, 1, i) == LUA_TNIL) ? 1 : 2;

+}

+

+

+/*

+** 'ipairs' function. Returns 'ipairsaux', given "table", 0.

+** (The given "table" may not be a table.)

+*/

+static int luaB_ipairs (lua_State *L) {

+  luaL_checkany(L, 1);

+  lua_pushcfunction(L, ipairsaux);  /* iteration function */

+  lua_pushvalue(L, 1);  /* state */

+  lua_pushinteger(L, 0);  /* initial value */

+  return 3;

+}

+

+

+static int load_aux (lua_State *L, int status, int envidx) {

+  if (status == LUA_OK) {

+    if (envidx != 0) {  /* 'env' parameter? */

+      lua_pushvalue(L, envidx);  /* environment for loaded function */

+      if (!lua_setupvalue(L, -2, 1))  /* set it as 1st upvalue */

+        lua_pop(L, 1);  /* remove 'env' if not used by previous call */

+    }

+    return 1;

+  }

+  else {  /* error (message is on top of the stack) */

+    luaL_pushfail(L);

+    lua_insert(L, -2);  /* put before error message */

+    return 2;  /* return fail plus error message */

+  }

+}

+

+

+static int luaB_loadfile (lua_State *L) {

+  const char *fname = luaL_optstring(L, 1, NULL);

+  const char *mode = luaL_optstring(L, 2, NULL);

+  int env = (!lua_isnone(L, 3) ? 3 : 0);  /* 'env' index or 0 if no 'env' */

+  int status = luaL_loadfilex(L, fname, mode);

+  return load_aux(L, status, env);

+}

+

+

+/*

+** {======================================================

+** Generic Read function

+** =======================================================

+*/

+

+

+/*

+** reserved slot, above all arguments, to hold a copy of the returned

+** string to avoid it being collected while parsed. 'load' has four

+** optional arguments (chunk, source name, mode, and environment).

+*/

+#define RESERVEDSLOT	5

+

+

+/*

+** Reader for generic 'load' function: 'lua_load' uses the

+** stack for internal stuff, so the reader cannot change the

+** stack top. Instead, it keeps its resulting string in a

+** reserved slot inside the stack.

+*/

+static const char *generic_reader (lua_State *L, void *ud, size_t *size) {

+  (void)(ud);  /* not used */

+  luaL_checkstack(L, 2, "too many nested functions");

+  lua_pushvalue(L, 1);  /* get function */

+  lua_call(L, 0, 1);  /* call it */

+  if (lua_isnil(L, -1)) {

+    lua_pop(L, 1);  /* pop result */

+    *size = 0;

+    return NULL;

+  }

+  else if (!lua_isstring(L, -1))

+    luaL_error(L, "reader function must return a string");

+  lua_replace(L, RESERVEDSLOT);  /* save string in reserved slot */

+  return lua_tolstring(L, RESERVEDSLOT, size);

+}

+

+

+static int luaB_load (lua_State *L) {

+  int status;

+  size_t l;

+  const char *s = lua_tolstring(L, 1, &l);

+  const char *mode = luaL_optstring(L, 3, "bt");

+  int env = (!lua_isnone(L, 4) ? 4 : 0);  /* 'env' index or 0 if no 'env' */

+  if (s != NULL) {  /* loading a string? */

+    const char *chunkname = luaL_optstring(L, 2, s);

+    status = luaL_loadbufferx(L, s, l, chunkname, mode);

+  }

+  else {  /* loading from a reader function */

+    const char *chunkname = luaL_optstring(L, 2, "=(load)");

+    luaL_checktype(L, 1, LUA_TFUNCTION);

+    lua_settop(L, RESERVEDSLOT);  /* create reserved slot */

+    status = lua_load(L, generic_reader, NULL, chunkname, mode);

+  }

+  return load_aux(L, status, env);

+}

+

+/* }====================================================== */

+

+

+static int dofilecont (lua_State *L, int d1, lua_KContext d2) {

+  (void)d1;  (void)d2;  /* only to match 'lua_Kfunction' prototype */

+  return lua_gettop(L) - 1;

+}

+

+

+static int luaB_dofile (lua_State *L) {

+  const char *fname = luaL_optstring(L, 1, NULL);

+  lua_settop(L, 1);

+  if (luaL_loadfile(L, fname) != LUA_OK)

+    return lua_error(L);

+  lua_callk(L, 0, LUA_MULTRET, 0, dofilecont);

+  return dofilecont(L, 0, 0);

+}

+

+

+static int luaB_assert (lua_State *L) {

+  if (lua_toboolean(L, 1))  /* condition is true? */

+    return lua_gettop(L);  /* return all arguments */

+  else {  /* error */

+    luaL_checkany(L, 1);  /* there must be a condition */

+    lua_remove(L, 1);  /* remove it */

+    lua_pushliteral(L, "assertion failed!");  /* default message */

+    lua_settop(L, 1);  /* leave only message (default if no other one) */

+    return luaB_error(L);  /* call 'error' */

+  }

+}

+

+

+static int luaB_select (lua_State *L) {

+  int n = lua_gettop(L);

+  if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {

+    lua_pushinteger(L, n-1);

+    return 1;

+  }

+  else {

+    lua_Integer i = luaL_checkinteger(L, 1);

+    if (i < 0) i = n + i;

+    else if (i > n) i = n;

+    luaL_argcheck(L, 1 <= i, 1, "index out of range");

+    return n - (int)i;

+  }

+}

+

+

+/*

+** Continuation function for 'pcall' and 'xpcall'. Both functions

+** already pushed a 'true' before doing the call, so in case of success

+** 'finishpcall' only has to return everything in the stack minus

+** 'extra' values (where 'extra' is exactly the number of items to be

+** ignored).

+*/

+static int finishpcall (lua_State *L, int status, lua_KContext extra) {

+  if (status != LUA_OK && status != LUA_YIELD) {  /* error? */

+    lua_pushboolean(L, 0);  /* first result (false) */

+    lua_pushvalue(L, -2);  /* error message */

+    return 2;  /* return false, msg */

+  }

+  else

+    return lua_gettop(L) - (int)extra;  /* return all results */

+}

+

+

+static int luaB_pcall (lua_State *L) {

+  int status;

+  luaL_checkany(L, 1);

+  lua_pushboolean(L, 1);  /* first result if no errors */

+  lua_insert(L, 1);  /* put it in place */

+  status = lua_pcallk(L, lua_gettop(L) - 2, LUA_MULTRET, 0, 0, finishpcall);

+  return finishpcall(L, status, 0);

+}

+

+

+/*

+** Do a protected call with error handling. After 'lua_rotate', the

+** stack will have <f, err, true, f, [args...]>; so, the function passes

+** 2 to 'finishpcall' to skip the 2 first values when returning results.

+*/

+static int luaB_xpcall (lua_State *L) {

+  int status;

+  int n = lua_gettop(L);

+  luaL_checktype(L, 2, LUA_TFUNCTION);  /* check error function */

+  lua_pushboolean(L, 1);  /* first result */

+  lua_pushvalue(L, 1);  /* function */

+  lua_rotate(L, 3, 2);  /* move them below function's arguments */

+  status = lua_pcallk(L, n - 2, LUA_MULTRET, 2, 2, finishpcall);

+  return finishpcall(L, status, 2);

+}

+

+

+static int luaB_tostring (lua_State *L) {

+  luaL_checkany(L, 1);

+  luaL_tolstring(L, 1, NULL);

+  return 1;

+}

+

+

+static const luaL_Reg base_funcs[] = {

+  {"assert", luaB_assert},

+  {"collectgarbage", luaB_collectgarbage},

+  {"dofile", luaB_dofile},

+  {"error", luaB_error},

+  {"getmetatable", luaB_getmetatable},

+  {"ipairs", luaB_ipairs},

+  {"loadfile", luaB_loadfile},

+  {"load", luaB_load},

+  {"next", luaB_next},

+  {"pairs", luaB_pairs},

+  {"pcall", luaB_pcall},

+  {"print", luaB_print},

+  {"warn", luaB_warn},

+  {"rawequal", luaB_rawequal},

+  {"rawlen", luaB_rawlen},

+  {"rawget", luaB_rawget},

+  {"rawset", luaB_rawset},

+  {"select", luaB_select},

+  {"setmetatable", luaB_setmetatable},

+  {"tonumber", luaB_tonumber},

+  {"tostring", luaB_tostring},

+  {"type", luaB_type},

+  {"xpcall", luaB_xpcall},

+  /* placeholders */

+  {LUA_GNAME, NULL},

+  {"_VERSION", NULL},

+  {NULL, NULL}

+};

+

+

+LUAMOD_API int luaopen_base (lua_State *L) {

+  /* open lib into global table */

+  lua_pushglobaltable(L);

+  luaL_setfuncs(L, base_funcs, 0);

+  /* set global _G */

+  lua_pushvalue(L, -1);

+  lua_setfield(L, -2, LUA_GNAME);

+  /* set global _VERSION */

+  lua_pushliteral(L, LUA_VERSION);

+  lua_setfield(L, -2, "_VERSION");

+  return 1;

+}

+

--- /dev/null

+++ b/lcode.c

@@ -1,0 +1,1818 @@

+/*

+** $Id: lcode.c $

+** Code generator for Lua

+** See Copyright Notice in lua.h

+*/

+

+#define lcode_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <limits.h>

+#include <math.h>

+#include <stdlib.h>

+

+#include "lua.h"

+

+#include "lcode.h"

+#include "ldebug.h"

+#include "ldo.h"

+#include "lgc.h"

+#include "llex.h"

+#include "lmem.h"

+#include "lobject.h"

+#include "lopcodes.h"

+#include "lparser.h"

+#include "lstring.h"

+#include "ltable.h"

+#include "lvm.h"

+

+

+/* Maximum number of registers in a Lua function (must fit in 8 bits) */

+#define MAXREGS		255

+

+

+#define hasjumps(e)	((e)->t != (e)->f)

+

+

+static int codesJ (FuncState *fs, OpCode o, int sj, int k);

+

+

+

+/* semantic error */

+l_noret luaK_semerror (LexState *ls, const char *msg) {

+  ls->t.token = 0;  /* remove "near <token>" from final message */

+  luaX_syntaxerror(ls, msg);

+}

+

+

+/*

+** If expression is a numeric constant, fills 'v' with its value

+** and returns 1. Otherwise, returns 0.

+*/

+static int tonumeral (const expdesc *e, TValue *v) {

+  if (hasjumps(e))

+    return 0;  /* not a numeral */

+  switch (e->k) {

+    case VKINT:

+      if (v) setivalue(v, e->u.ival);

+      return 1;

+    case VKFLT:

+      if (v) setfltvalue(v, e->u.nval);

+      return 1;

+    default: return 0;

+  }

+}

+

+

+/*

+** Get the constant value from a constant expression

+*/

+static TValue *const2val (FuncState *fs, const expdesc *e) {

+  lua_assert(e->k == VCONST);

+  return &fs->ls->dyd->actvar.arr[e->u.info].k;

+}

+

+

+/*

+** If expression is a constant, fills 'v' with its value

+** and returns 1. Otherwise, returns 0.

+*/

+int luaK_exp2const (FuncState *fs, const expdesc *e, TValue *v) {

+  if (hasjumps(e))

+    return 0;  /* not a constant */

+  switch (e->k) {

+    case VFALSE:

+      setbfvalue(v);

+      return 1;

+    case VTRUE:

+      setbtvalue(v);

+      return 1;

+    case VNIL:

+      setnilvalue(v);

+      return 1;

+    case VKSTR: {

+      setsvalue(fs->ls->L, v, e->u.strval);

+      return 1;

+    }

+    case VCONST: {

+      setobj(fs->ls->L, v, const2val(fs, e));

+      return 1;

+    }

+    default: return tonumeral(e, v);

+  }

+}

+

+

+/*

+** Return the previous instruction of the current code. If there

+** may be a jump target between the current instruction and the

+** previous one, return an invalid instruction (to avoid wrong

+** optimizations).

+*/

+static Instruction *previousinstruction (FuncState *fs) {

+  static const Instruction invalidinstruction = ~(Instruction)0;

+  if (fs->pc > fs->lasttarget)

+    return &fs->f->code[fs->pc - 1];  /* previous instruction */

+  else

+    return cast(Instruction*, &invalidinstruction);

+}

+

+

+/*

+** Create a OP_LOADNIL instruction, but try to optimize: if the previous

+** instruction is also OP_LOADNIL and ranges are compatible, adjust

+** range of previous instruction instead of emitting a new one. (For

+** instance, 'local a; local b' will generate a single opcode.)

+*/

+void luaK_nil (FuncState *fs, int from, int n) {

+  int l = from + n - 1;  /* last register to set nil */

+  Instruction *previous = previousinstruction(fs);

+  if (GET_OPCODE(*previous) == OP_LOADNIL) {  /* previous is LOADNIL? */

+    int pfrom = GETARG_A(*previous);  /* get previous range */

+    int pl = pfrom + GETARG_B(*previous);

+    if ((pfrom <= from && from <= pl + 1) ||

+        (from <= pfrom && pfrom <= l + 1)) {  /* can connect both? */

+      if (pfrom < from) from = pfrom;  /* from = min(from, pfrom) */

+      if (pl > l) l = pl;  /* l = max(l, pl) */

+      SETARG_A(*previous, from);

+      SETARG_B(*previous, l - from);

+      return;

+    }  /* else go through */

+  }

+  luaK_codeABC(fs, OP_LOADNIL, from, n - 1, 0);  /* else no optimization */

+}

+

+

+/*

+** Gets the destination address of a jump instruction. Used to traverse

+** a list of jumps.

+*/

+static int getjump (FuncState *fs, int pc) {

+  int offset = GETARG_sJ(fs->f->code[pc]);

+  if (offset == NO_JUMP)  /* point to itself represents end of list */

+    return NO_JUMP;  /* end of list */

+  else

+    return (pc+1)+offset;  /* turn offset into absolute position */

+}

+

+

+/*

+** Fix jump instruction at position 'pc' to jump to 'dest'.

+** (Jump addresses are relative in Lua)

+*/

+static void fixjump (FuncState *fs, int pc, int dest) {

+  Instruction *jmp = &fs->f->code[pc];

+  int offset = dest - (pc + 1);

+  lua_assert(dest != NO_JUMP);

+  if (!(-OFFSET_sJ <= offset && offset <= MAXARG_sJ - OFFSET_sJ))

+    luaX_syntaxerror(fs->ls, "control structure too long");

+  lua_assert(GET_OPCODE(*jmp) == OP_JMP);

+  SETARG_sJ(*jmp, offset);

+}

+

+

+/*

+** Concatenate jump-list 'l2' into jump-list 'l1'

+*/

+void luaK_concat (FuncState *fs, int *l1, int l2) {

+  if (l2 == NO_JUMP) return;  /* nothing to concatenate? */

+  else if (*l1 == NO_JUMP)  /* no original list? */

+    *l1 = l2;  /* 'l1' points to 'l2' */

+  else {

+    int list = *l1;

+    int next;

+    while ((next = getjump(fs, list)) != NO_JUMP)  /* find last element */

+      list = next;

+    fixjump(fs, list, l2);  /* last element links to 'l2' */

+  }

+}

+

+

+/*

+** Create a jump instruction and return its position, so its destination

+** can be fixed later (with 'fixjump').

+*/

+int luaK_jump (FuncState *fs) {

+  return codesJ(fs, OP_JMP, NO_JUMP, 0);

+}

+

+

+/*

+** Code a 'return' instruction

+*/

+void luaK_ret (FuncState *fs, int first, int nret) {

+  OpCode op;

+  switch (nret) {

+    case 0: op = OP_RETURN0; break;

+    case 1: op = OP_RETURN1; break;

+    default: op = OP_RETURN; break;

+  }

+  luaK_codeABC(fs, op, first, nret + 1, 0);

+}

+

+

+/*

+** Code a "conditional jump", that is, a test or comparison opcode

+** followed by a jump. Return jump position.

+*/

+static int condjump (FuncState *fs, OpCode op, int A, int B, int C, int k) {

+  luaK_codeABCk(fs, op, A, B, C, k);

+  return luaK_jump(fs);

+}

+

+

+/*

+** returns current 'pc' and marks it as a jump target (to avoid wrong

+** optimizations with consecutive instructions not in the same basic block).

+*/

+int luaK_getlabel (FuncState *fs) {

+  fs->lasttarget = fs->pc;

+  return fs->pc;

+}

+

+

+/*

+** Returns the position of the instruction "controlling" a given

+** jump (that is, its condition), or the jump itself if it is

+** unconditional.

+*/

+static Instruction *getjumpcontrol (FuncState *fs, int pc) {

+  Instruction *pi = &fs->f->code[pc];

+  if (pc >= 1 && testTMode(GET_OPCODE(*(pi-1))))

+    return pi-1;

+  else

+    return pi;

+}

+

+

+/*

+** Patch destination register for a TESTSET instruction.

+** If instruction in position 'node' is not a TESTSET, return 0 ("fails").

+** Otherwise, if 'reg' is not 'NO_REG', set it as the destination

+** register. Otherwise, change instruction to a simple 'TEST' (produces

+** no register value)

+*/

+static int patchtestreg (FuncState *fs, int node, int reg) {

+  Instruction *i = getjumpcontrol(fs, node);

+  if (GET_OPCODE(*i) != OP_TESTSET)

+    return 0;  /* cannot patch other instructions */

+  if (reg != NO_REG && reg != GETARG_B(*i))

+    SETARG_A(*i, reg);

+  else {

+     /* no register to put value or register already has the value;

+        change instruction to simple test */

+    *i = CREATE_ABCk(OP_TEST, GETARG_B(*i), 0, 0, GETARG_k(*i));

+  }

+  return 1;

+}

+

+

+/*

+** Traverse a list of tests ensuring no one produces a value

+*/

+static void removevalues (FuncState *fs, int list) {

+  for (; list != NO_JUMP; list = getjump(fs, list))

+      patchtestreg(fs, list, NO_REG);

+}

+

+

+/*

+** Traverse a list of tests, patching their destination address and

+** registers: tests producing values jump to 'vtarget' (and put their

+** values in 'reg'), other tests jump to 'dtarget'.

+*/

+static void patchlistaux (FuncState *fs, int list, int vtarget, int reg,

+                          int dtarget) {

+  while (list != NO_JUMP) {

+    int next = getjump(fs, list);

+    if (patchtestreg(fs, list, reg))

+      fixjump(fs, list, vtarget);

+    else

+      fixjump(fs, list, dtarget);  /* jump to default target */

+    list = next;

+  }

+}

+

+

+/*

+** Path all jumps in 'list' to jump to 'target'.

+** (The assert means that we cannot fix a jump to a forward address

+** because we only know addresses once code is generated.)

+*/

+void luaK_patchlist (FuncState *fs, int list, int target) {

+  lua_assert(target <= fs->pc);

+  patchlistaux(fs, list, target, NO_REG, target);

+}

+

+

+void luaK_patchtohere (FuncState *fs, int list) {

+  int hr = luaK_getlabel(fs);  /* mark "here" as a jump target */

+  luaK_patchlist(fs, list, hr);

+}

+

+

+/*

+** MAXimum number of successive Instructions WiTHout ABSolute line

+** information.

+*/

+#if !defined(MAXIWTHABS)

+#define MAXIWTHABS	120

+#endif

+

+

+/* limit for difference between lines in relative line info. */

+#define LIMLINEDIFF	0x80

+

+

+/*

+** Save line info for a new instruction. If difference from last line

+** does not fit in a byte, of after that many instructions, save a new

+** absolute line info; (in that case, the special value 'ABSLINEINFO'

+** in 'lineinfo' signals the existence of this absolute information.)

+** Otherwise, store the difference from last line in 'lineinfo'.

+*/

+static void savelineinfo (FuncState *fs, Proto *f, int line) {

+  int linedif = line - fs->previousline;

+  int pc = fs->pc - 1;  /* last instruction coded */

+  if (abs(linedif) >= LIMLINEDIFF || fs->iwthabs++ > MAXIWTHABS) {

+    luaM_growvector(fs->ls->L, f->abslineinfo, fs->nabslineinfo,

+                    f->sizeabslineinfo, AbsLineInfo, MAX_INT, "lines");

+    f->abslineinfo[fs->nabslineinfo].pc = pc;

+    f->abslineinfo[fs->nabslineinfo++].line = line;

+    linedif = ABSLINEINFO;  /* signal that there is absolute information */

+    fs->iwthabs = 0;  /* restart counter */

+  }

+  luaM_growvector(fs->ls->L, f->lineinfo, pc, f->sizelineinfo, ls_byte,

+                  MAX_INT, "opcodes");

+  f->lineinfo[pc] = linedif;

+  fs->previousline = line;  /* last line saved */

+}

+

+

+/*

+** Remove line information from the last instruction.

+** If line information for that instruction is absolute, set 'iwthabs'

+** above its max to force the new (replacing) instruction to have

+** absolute line info, too.

+*/

+static void removelastlineinfo (FuncState *fs) {

+  Proto *f = fs->f;

+  int pc = fs->pc - 1;  /* last instruction coded */

+  if (f->lineinfo[pc] != ABSLINEINFO) {  /* relative line info? */

+    fs->previousline -= f->lineinfo[pc];  /* correct last line saved */

+    fs->iwthabs--;  /* undo previous increment */

+  }

+  else {  /* absolute line information */

+    lua_assert(f->abslineinfo[fs->nabslineinfo - 1].pc == pc);

+    fs->nabslineinfo--;  /* remove it */

+    fs->iwthabs = MAXIWTHABS + 1;  /* force next line info to be absolute */

+  }

+}

+

+

+/*

+** Remove the last instruction created, correcting line information

+** accordingly.

+*/

+static void removelastinstruction (FuncState *fs) {

+  removelastlineinfo(fs);

+  fs->pc--;

+}

+

+

+/*

+** Emit instruction 'i', checking for array sizes and saving also its

+** line information. Return 'i' position.

+*/

+int luaK_code (FuncState *fs, Instruction i) {

+  Proto *f = fs->f;

+  /* put new instruction in code array */

+  luaM_growvector(fs->ls->L, f->code, fs->pc, f->sizecode, Instruction,

+                  MAX_INT, "opcodes");

+  f->code[fs->pc++] = i;

+  savelineinfo(fs, f, fs->ls->lastline);

+  return fs->pc - 1;  /* index of new instruction */

+}

+

+

+/*

+** Format and emit an 'iABC' instruction. (Assertions check consistency

+** of parameters versus opcode.)

+*/

+int luaK_codeABCk (FuncState *fs, OpCode o, int a, int b, int c, int k) {

+  lua_assert(getOpMode(o) == iABC);

+  lua_assert(a <= MAXARG_A && b <= MAXARG_B &&

+             c <= MAXARG_C && (k & ~1) == 0);

+  return luaK_code(fs, CREATE_ABCk(o, a, b, c, k));

+}

+

+

+/*

+** Format and emit an 'iABx' instruction.

+*/

+int luaK_codeABx (FuncState *fs, OpCode o, int a, unsigned int bc) {

+  lua_assert(getOpMode(o) == iABx);

+  lua_assert(a <= MAXARG_A && bc <= MAXARG_Bx);

+  return luaK_code(fs, CREATE_ABx(o, a, bc));

+}

+

+

+/*

+** Format and emit an 'iAsBx' instruction.

+*/

+int luaK_codeAsBx (FuncState *fs, OpCode o, int a, int bc) {

+  unsigned int b = bc + OFFSET_sBx;

+  lua_assert(getOpMode(o) == iAsBx);

+  lua_assert(a <= MAXARG_A && b <= MAXARG_Bx);

+  return luaK_code(fs, CREATE_ABx(o, a, b));

+}

+

+

+/*

+** Format and emit an 'isJ' instruction.

+*/

+static int codesJ (FuncState *fs, OpCode o, int sj, int k) {

+  unsigned int j = sj + OFFSET_sJ;

+  lua_assert(getOpMode(o) == isJ);

+  lua_assert(j <= MAXARG_sJ && (k & ~1) == 0);

+  return luaK_code(fs, CREATE_sJ(o, j, k));

+}

+

+

+/*

+** Emit an "extra argument" instruction (format 'iAx')

+*/

+static int codeextraarg (FuncState *fs, int a) {

+  lua_assert(a <= MAXARG_Ax);

+  return luaK_code(fs, CREATE_Ax(OP_EXTRAARG, a));

+}

+

+

+/*

+** Emit a "load constant" instruction, using either 'OP_LOADK'

+** (if constant index 'k' fits in 18 bits) or an 'OP_LOADKX'

+** instruction with "extra argument".

+*/

+static int luaK_codek (FuncState *fs, int reg, int k) {

+  if (k <= MAXARG_Bx)

+    return luaK_codeABx(fs, OP_LOADK, reg, k);

+  else {

+    int p = luaK_codeABx(fs, OP_LOADKX, reg, 0);

+    codeextraarg(fs, k);

+    return p;

+  }

+}

+

+

+/*

+** Check register-stack level, keeping track of its maximum size

+** in field 'maxstacksize'

+*/

+void luaK_checkstack (FuncState *fs, int n) {

+  int newstack = fs->freereg + n;

+  if (newstack > fs->f->maxstacksize) {

+    if (newstack >= MAXREGS)

+      luaX_syntaxerror(fs->ls,

+        "function or expression needs too many registers");

+    fs->f->maxstacksize = cast_byte(newstack);

+  }

+}

+

+

+/*

+** Reserve 'n' registers in register stack

+*/

+void luaK_reserveregs (FuncState *fs, int n) {

+  luaK_checkstack(fs, n);

+  fs->freereg += n;

+}

+

+

+/*

+** Free register 'reg', if it is neither a constant index nor

+** a local variable.

+)

+*/

+static void freereg (FuncState *fs, int reg) {

+  if (reg >= luaY_nvarstack(fs)) {

+    fs->freereg--;

+    lua_assert(reg == fs->freereg);

+  }

+}

+

+

+/*

+** Free two registers in proper order

+*/

+static void freeregs (FuncState *fs, int r1, int r2) {

+  if (r1 > r2) {

+    freereg(fs, r1);

+    freereg(fs, r2);

+  }

+  else {

+    freereg(fs, r2);

+    freereg(fs, r1);

+  }

+}

+

+

+/*

+** Free register used by expression 'e' (if any)

+*/

+static void freeexp (FuncState *fs, expdesc *e) {

+  if (e->k == VNONRELOC)

+    freereg(fs, e->u.info);

+}

+

+

+/*

+** Free registers used by expressions 'e1' and 'e2' (if any) in proper

+** order.

+*/

+static void freeexps (FuncState *fs, expdesc *e1, expdesc *e2) {

+  int r1 = (e1->k == VNONRELOC) ? e1->u.info : -1;

+  int r2 = (e2->k == VNONRELOC) ? e2->u.info : -1;

+  freeregs(fs, r1, r2);

+}

+

+

+/*

+** Add constant 'v' to prototype's list of constants (field 'k').

+** Use scanner's table to cache position of constants in constant list

+** and try to reuse constants. Because some values should not be used

+** as keys (nil cannot be a key, integer keys can collapse with float

+** keys), the caller must provide a useful 'key' for indexing the cache.

+*/

+static int addk (FuncState *fs, TValue *key, TValue *v) {

+  lua_State *L = fs->ls->L;

+  Proto *f = fs->f;

+  TValue *idx = luaH_set(L, fs->ls->h, key);  /* index scanner table */

+  int k, oldsize;

+  if (ttisinteger(idx)) {  /* is there an index there? */

+    k = cast_int(ivalue(idx));

+    /* correct value? (warning: must distinguish floats from integers!) */

+    if (k < fs->nk && ttypetag(&f->k[k]) == ttypetag(v) &&

+                      luaV_rawequalobj(&f->k[k], v))

+      return k;  /* reuse index */

+  }

+  /* constant not found; create a new entry */

+  oldsize = f->sizek;

+  k = fs->nk;

+  /* numerical value does not need GC barrier;

+     table has no metatable, so it does not need to invalidate cache */

+  setivalue(idx, k);

+  luaM_growvector(L, f->k, k, f->sizek, TValue, MAXARG_Ax, "constants");

+  while (oldsize < f->sizek) setnilvalue(&f->k[oldsize++]);

+  setobj(L, &f->k[k], v);

+  fs->nk++;

+  luaC_barrier(L, f, v);

+  return k;

+}

+

+

+/*

+** Add a string to list of constants and return its index.

+*/

+static int stringK (FuncState *fs, TString *s) {

+  TValue o;

+  setsvalue(fs->ls->L, &o, s);

+  return addk(fs, &o, &o);  /* use string itself as key */

+}

+

+

+/*

+** Add an integer to list of constants and return its index.

+** Integers use userdata as keys to avoid collision with floats with

+** same value; conversion to 'void*' is used only for hashing, so there

+** are no "precision" problems.

+*/

+static int luaK_intK (FuncState *fs, lua_Integer n) {

+  TValue k, o;

+  setpvalue(&k, cast_voidp(cast_sizet(n)));

+  setivalue(&o, n);

+  return addk(fs, &k, &o);

+}

+

+/*

+** Add a float to list of constants and return its index.

+*/

+static int luaK_numberK (FuncState *fs, lua_Number r) {

+  TValue o;

+  setfltvalue(&o, r);

+  return addk(fs, &o, &o);  /* use number itself as key */

+}

+

+

+/*

+** Add a false to list of constants and return its index.

+*/

+static int boolF (FuncState *fs) {

+  TValue o;

+  setbfvalue(&o);

+  return addk(fs, &o, &o);  /* use boolean itself as key */

+}

+

+

+/*

+** Add a true to list of constants and return its index.

+*/

+static int boolT (FuncState *fs) {

+  TValue o;

+  setbtvalue(&o);

+  return addk(fs, &o, &o);  /* use boolean itself as key */

+}

+

+

+/*

+** Add nil to list of constants and return its index.

+*/

+static int nilK (FuncState *fs) {

+  TValue k, v;

+  setnilvalue(&v);

+  /* cannot use nil as key; instead use table itself to represent nil */

+  sethvalue(fs->ls->L, &k, fs->ls->h);

+  return addk(fs, &k, &v);

+}

+

+

+/*

+** Check whether 'i' can be stored in an 'sC' operand. Equivalent to

+** (0 <= int2sC(i) && int2sC(i) <= MAXARG_C) but without risk of

+** overflows in the hidden addition inside 'int2sC'.

+*/

+static int fitsC (lua_Integer i) {

+  return (l_castS2U(i) + OFFSET_sC <= cast_uint(MAXARG_C));

+}

+

+

+/*

+** Check whether 'i' can be stored in an 'sBx' operand.

+*/

+static int fitsBx (lua_Integer i) {

+  return (-OFFSET_sBx <= i && i <= MAXARG_Bx - OFFSET_sBx);

+}

+

+

+void luaK_int (FuncState *fs, int reg, lua_Integer i) {

+  if (fitsBx(i))

+    luaK_codeAsBx(fs, OP_LOADI, reg, cast_int(i));

+  else

+    luaK_codek(fs, reg, luaK_intK(fs, i));

+}

+

+

+static void luaK_float (FuncState *fs, int reg, lua_Number f) {

+  lua_Integer fi;

+  if (luaV_flttointeger(f, &fi, F2Ieq) && fitsBx(fi))

+    luaK_codeAsBx(fs, OP_LOADF, reg, cast_int(fi));

+  else

+    luaK_codek(fs, reg, luaK_numberK(fs, f));

+}

+

+

+/*

+** Convert a constant in 'v' into an expression description 'e'

+*/

+static void const2exp (TValue *v, expdesc *e) {

+  switch (ttypetag(v)) {

+    case LUA_VNUMINT:

+      e->k = VKINT; e->u.ival = ivalue(v);

+      break;

+    case LUA_VNUMFLT:

+      e->k = VKFLT; e->u.nval = fltvalue(v);

+      break;

+    case LUA_VFALSE:

+      e->k = VFALSE;

+      break;

+    case LUA_VTRUE:

+      e->k = VTRUE;

+      break;

+    case LUA_VNIL:

+      e->k = VNIL;

+      break;

+    case LUA_VSHRSTR:  case LUA_VLNGSTR:

+      e->k = VKSTR; e->u.strval = tsvalue(v);

+      break;

+    default: lua_assert(0);

+  }

+}

+

+

+/*

+** Fix an expression to return the number of results 'nresults'.

+** 'e' must be a multi-ret expression (function call or vararg).

+*/

+void luaK_setreturns (FuncState *fs, expdesc *e, int nresults) {

+  Instruction *pc = &getinstruction(fs, e);

+  if (e->k == VCALL)  /* expression is an open function call? */

+    SETARG_C(*pc, nresults + 1);

+  else {

+    lua_assert(e->k == VVARARG);

+    SETARG_C(*pc, nresults + 1);

+    SETARG_A(*pc, fs->freereg);

+    luaK_reserveregs(fs, 1);

+  }

+}

+

+

+/*

+** Convert a VKSTR to a VK

+*/

+static void str2K (FuncState *fs, expdesc *e) {

+  lua_assert(e->k == VKSTR);

+  e->u.info = stringK(fs, e->u.strval);

+  e->k = VK;

+}

+

+

+/*

+** Fix an expression to return one result.

+** If expression is not a multi-ret expression (function call or

+** vararg), it already returns one result, so nothing needs to be done.

+** Function calls become VNONRELOC expressions (as its result comes

+** fixed in the base register of the call), while vararg expressions

+** become VRELOC (as OP_VARARG puts its results where it wants).

+** (Calls are created returning one result, so that does not need

+** to be fixed.)

+*/

+void luaK_setoneret (FuncState *fs, expdesc *e) {

+  if (e->k == VCALL) {  /* expression is an open function call? */

+    /* already returns 1 value */

+    lua_assert(GETARG_C(getinstruction(fs, e)) == 2);

+    e->k = VNONRELOC;  /* result has fixed position */

+    e->u.info = GETARG_A(getinstruction(fs, e));

+  }

+  else if (e->k == VVARARG) {

+    SETARG_C(getinstruction(fs, e), 2);

+    e->k = VRELOC;  /* can relocate its simple result */

+  }

+}

+

+

+/*

+** Ensure that expression 'e' is not a variable (nor a <const>).

+** (Expression still may have jump lists.)

+*/

+void luaK_dischargevars (FuncState *fs, expdesc *e) {

+  switch (e->k) {

+    case VCONST: {

+      const2exp(const2val(fs, e), e);

+      break;

+    }

+    case VLOCAL: {  /* already in a register */

+      e->u.info = e->u.var.sidx;

+      e->k = VNONRELOC;  /* becomes a non-relocatable value */

+      break;

+    }

+    case VUPVAL: {  /* move value to some (pending) register */

+      e->u.info = luaK_codeABC(fs, OP_GETUPVAL, 0, e->u.info, 0);

+      e->k = VRELOC;

+      break;

+    }

+    case VINDEXUP: {

+      e->u.info = luaK_codeABC(fs, OP_GETTABUP, 0, e->u.ind.t, e->u.ind.idx);

+      e->k = VRELOC;

+      break;

+    }

+    case VINDEXI: {

+      freereg(fs, e->u.ind.t);

+      e->u.info = luaK_codeABC(fs, OP_GETI, 0, e->u.ind.t, e->u.ind.idx);

+      e->k = VRELOC;

+      break;

+    }

+    case VINDEXSTR: {

+      freereg(fs, e->u.ind.t);

+      e->u.info = luaK_codeABC(fs, OP_GETFIELD, 0, e->u.ind.t, e->u.ind.idx);

+      e->k = VRELOC;

+      break;

+    }

+    case VINDEXED: {

+      freeregs(fs, e->u.ind.t, e->u.ind.idx);

+      e->u.info = luaK_codeABC(fs, OP_GETTABLE, 0, e->u.ind.t, e->u.ind.idx);

+      e->k = VRELOC;

+      break;

+    }

+    case VVARARG: case VCALL: {

+      luaK_setoneret(fs, e);

+      break;

+    }

+    default: break;  /* there is one value available (somewhere) */

+  }

+}

+

+

+/*

+** Ensure expression value is in register 'reg', making 'e' a

+** non-relocatable expression.

+** (Expression still may have jump lists.)

+*/

+static void discharge2reg (FuncState *fs, expdesc *e, int reg) {

+  luaK_dischargevars(fs, e);

+  switch (e->k) {

+    case VNIL: {

+      luaK_nil(fs, reg, 1);

+      break;

+    }

+    case VFALSE: {

+      luaK_codeABC(fs, OP_LOADFALSE, reg, 0, 0);

+      break;

+    }

+    case VTRUE: {

+      luaK_codeABC(fs, OP_LOADTRUE, reg, 0, 0);

+      break;

+    }

+    case VKSTR: {

+      str2K(fs, e);

+    }  /* FALLTHROUGH */

+    case VK: {

+      luaK_codek(fs, reg, e->u.info);

+      break;

+    }

+    case VKFLT: {

+      luaK_float(fs, reg, e->u.nval);

+      break;

+    }

+    case VKINT: {

+      luaK_int(fs, reg, e->u.ival);

+      break;

+    }

+    case VRELOC: {

+      Instruction *pc = &getinstruction(fs, e);

+      SETARG_A(*pc, reg);  /* instruction will put result in 'reg' */

+      break;

+    }

+    case VNONRELOC: {

+      if (reg != e->u.info)

+        luaK_codeABC(fs, OP_MOVE, reg, e->u.info, 0);

+      break;

+    }

+    default: {

+      lua_assert(e->k == VJMP);

+      return;  /* nothing to do... */

+    }

+  }

+  e->u.info = reg;

+  e->k = VNONRELOC;

+}

+

+

+/*

+** Ensure expression value is in a register, making 'e' a

+** non-relocatable expression.

+** (Expression still may have jump lists.)

+*/

+static void discharge2anyreg (FuncState *fs, expdesc *e) {

+  if (e->k != VNONRELOC) {  /* no fixed register yet? */

+    luaK_reserveregs(fs, 1);  /* get a register */

+    discharge2reg(fs, e, fs->freereg-1);  /* put value there */

+  }

+}

+

+

+static int code_loadbool (FuncState *fs, int A, OpCode op) {

+  luaK_getlabel(fs);  /* those instructions may be jump targets */

+  return luaK_codeABC(fs, op, A, 0, 0);

+}

+

+

+/*

+** check whether list has any jump that do not produce a value

+** or produce an inverted value

+*/

+static int need_value (FuncState *fs, int list) {

+  for (; list != NO_JUMP; list = getjump(fs, list)) {

+    Instruction i = *getjumpcontrol(fs, list);

+    if (GET_OPCODE(i) != OP_TESTSET) return 1;

+  }

+  return 0;  /* not found */

+}

+

+

+/*

+** Ensures final expression result (which includes results from its

+** jump lists) is in register 'reg'.

+** If expression has jumps, need to patch these jumps either to

+** its final position or to "load" instructions (for those tests

+** that do not produce values).

+*/

+static void exp2reg (FuncState *fs, expdesc *e, int reg) {

+  discharge2reg(fs, e, reg);

+  if (e->k == VJMP)  /* expression itself is a test? */

+    luaK_concat(fs, &e->t, e->u.info);  /* put this jump in 't' list */

+  if (hasjumps(e)) {

+    int final;  /* position after whole expression */

+    int p_f = NO_JUMP;  /* position of an eventual LOAD false */

+    int p_t = NO_JUMP;  /* position of an eventual LOAD true */

+    if (need_value(fs, e->t) || need_value(fs, e->f)) {

+      int fj = (e->k == VJMP) ? NO_JUMP : luaK_jump(fs);

+      p_f = code_loadbool(fs, reg, OP_LFALSESKIP);  /* skip next inst. */

+      p_t = code_loadbool(fs, reg, OP_LOADTRUE);

+      /* jump around these booleans if 'e' is not a test */

+      luaK_patchtohere(fs, fj);

+    }

+    final = luaK_getlabel(fs);

+    patchlistaux(fs, e->f, final, reg, p_f);

+    patchlistaux(fs, e->t, final, reg, p_t);

+  }

+  e->f = e->t = NO_JUMP;

+  e->u.info = reg;

+  e->k = VNONRELOC;

+}

+

+

+/*

+** Ensures final expression result is in next available register.

+*/

+void luaK_exp2nextreg (FuncState *fs, expdesc *e) {

+  luaK_dischargevars(fs, e);

+  freeexp(fs, e);

+  luaK_reserveregs(fs, 1);

+  exp2reg(fs, e, fs->freereg - 1);

+}

+

+

+/*

+** Ensures final expression result is in some (any) register

+** and return that register.

+*/

+int luaK_exp2anyreg (FuncState *fs, expdesc *e) {

+  luaK_dischargevars(fs, e);

+  if (e->k == VNONRELOC) {  /* expression already has a register? */

+    if (!hasjumps(e))  /* no jumps? */

+      return e->u.info;  /* result is already in a register */

+    if (e->u.info >= luaY_nvarstack(fs)) {  /* reg. is not a local? */

+      exp2reg(fs, e, e->u.info);  /* put final result in it */

+      return e->u.info;

+    }

+    /* else expression has jumps and cannot change its register

+       to hold the jump values, because it is a local variable.

+       Go through to the default case. */

+  }

+  luaK_exp2nextreg(fs, e);  /* default: use next available register */

+  return e->u.info;

+}

+

+

+/*

+** Ensures final expression result is either in a register

+** or in an upvalue.

+*/

+void luaK_exp2anyregup (FuncState *fs, expdesc *e) {

+  if (e->k != VUPVAL || hasjumps(e))

+    luaK_exp2anyreg(fs, e);

+}

+

+

+/*

+** Ensures final expression result is either in a register

+** or it is a constant.

+*/

+void luaK_exp2val (FuncState *fs, expdesc *e) {

+  if (hasjumps(e))

+    luaK_exp2anyreg(fs, e);

+  else

+    luaK_dischargevars(fs, e);

+}

+

+

+/*

+** Try to make 'e' a K expression with an index in the range of R/K

+** indices. Return true iff succeeded.

+*/

+static int luaK_exp2K (FuncState *fs, expdesc *e) {

+  if (!hasjumps(e)) {

+    int info;

+    switch (e->k) {  /* move constants to 'k' */

+      case VTRUE: info = boolT(fs); break;

+      case VFALSE: info = boolF(fs); break;

+      case VNIL: info = nilK(fs); break;

+      case VKINT: info = luaK_intK(fs, e->u.ival); break;

+      case VKFLT: info = luaK_numberK(fs, e->u.nval); break;

+      case VKSTR: info = stringK(fs, e->u.strval); break;

+      case VK: info = e->u.info; break;

+      default: return 0;  /* not a constant */

+    }

+    if (info <= MAXINDEXRK) {  /* does constant fit in 'argC'? */

+      e->k = VK;  /* make expression a 'K' expression */

+      e->u.info = info;

+      return 1;

+    }

+  }

+  /* else, expression doesn't fit; leave it unchanged */

+  return 0;

+}

+

+

+/*

+** Ensures final expression result is in a valid R/K index

+** (that is, it is either in a register or in 'k' with an index

+** in the range of R/K indices).

+** Returns 1 iff expression is K.

+*/

+int luaK_exp2RK (FuncState *fs, expdesc *e) {

+  if (luaK_exp2K(fs, e))

+    return 1;

+  else {  /* not a constant in the right range: put it in a register */

+    luaK_exp2anyreg(fs, e);

+    return 0;

+  }

+}

+

+

+static void codeABRK (FuncState *fs, OpCode o, int a, int b,

+                      expdesc *ec) {

+  int k = luaK_exp2RK(fs, ec);

+  luaK_codeABCk(fs, o, a, b, ec->u.info, k);

+}

+

+

+/*

+** Generate code to store result of expression 'ex' into variable 'var'.

+*/

+void luaK_storevar (FuncState *fs, expdesc *var, expdesc *ex) {

+  switch (var->k) {

+    case VLOCAL: {

+      freeexp(fs, ex);

+      exp2reg(fs, ex, var->u.var.sidx);  /* compute 'ex' into proper place */

+      return;

+    }

+    case VUPVAL: {

+      int e = luaK_exp2anyreg(fs, ex);

+      luaK_codeABC(fs, OP_SETUPVAL, e, var->u.info, 0);

+      break;

+    }

+    case VINDEXUP: {

+      codeABRK(fs, OP_SETTABUP, var->u.ind.t, var->u.ind.idx, ex);

+      break;

+    }

+    case VINDEXI: {

+      codeABRK(fs, OP_SETI, var->u.ind.t, var->u.ind.idx, ex);

+      break;

+    }

+    case VINDEXSTR: {

+      codeABRK(fs, OP_SETFIELD, var->u.ind.t, var->u.ind.idx, ex);

+      break;

+    }

+    case VINDEXED: {

+      codeABRK(fs, OP_SETTABLE, var->u.ind.t, var->u.ind.idx, ex);

+      break;

+    }

+    default: lua_assert(0);  /* invalid var kind to store */

+  }

+  freeexp(fs, ex);

+}

+

+

+/*

+** Emit SELF instruction (convert expression 'e' into 'e:key(e,').

+*/

+void luaK_self (FuncState *fs, expdesc *e, expdesc *key) {

+  int ereg;

+  luaK_exp2anyreg(fs, e);

+  ereg = e->u.info;  /* register where 'e' was placed */

+  freeexp(fs, e);

+  e->u.info = fs->freereg;  /* base register for op_self */

+  e->k = VNONRELOC;  /* self expression has a fixed register */

+  luaK_reserveregs(fs, 2);  /* function and 'self' produced by op_self */

+  codeABRK(fs, OP_SELF, e->u.info, ereg, key);

+  freeexp(fs, key);

+}

+

+

+/*

+** Negate condition 'e' (where 'e' is a comparison).

+*/

+static void negatecondition (FuncState *fs, expdesc *e) {

+  Instruction *pc = getjumpcontrol(fs, e->u.info);

+  lua_assert(testTMode(GET_OPCODE(*pc)) && GET_OPCODE(*pc) != OP_TESTSET &&

+                                           GET_OPCODE(*pc) != OP_TEST);

+  SETARG_k(*pc, (GETARG_k(*pc) ^ 1));

+}

+

+

+/*

+** Emit instruction to jump if 'e' is 'cond' (that is, if 'cond'

+** is true, code will jump if 'e' is true.) Return jump position.

+** Optimize when 'e' is 'not' something, inverting the condition

+** and removing the 'not'.

+*/

+static int jumponcond (FuncState *fs, expdesc *e, int cond) {

+  if (e->k == VRELOC) {

+    Instruction ie = getinstruction(fs, e);

+    if (GET_OPCODE(ie) == OP_NOT) {

+      removelastinstruction(fs);  /* remove previous OP_NOT */

+      return condjump(fs, OP_TEST, GETARG_B(ie), 0, 0, !cond);

+    }

+    /* else go through */

+  }

+  discharge2anyreg(fs, e);

+  freeexp(fs, e);

+  return condjump(fs, OP_TESTSET, NO_REG, e->u.info, 0, cond);

+}

+

+

+/*

+** Emit code to go through if 'e' is true, jump otherwise.

+*/

+void luaK_goiftrue (FuncState *fs, expdesc *e) {

+  int pc;  /* pc of new jump */

+  luaK_dischargevars(fs, e);

+  switch (e->k) {

+    case VJMP: {  /* condition? */

+      negatecondition(fs, e);  /* jump when it is false */

+      pc = e->u.info;  /* save jump position */

+      break;

+    }

+    case VK: case VKFLT: case VKINT: case VKSTR: case VTRUE: {

+      pc = NO_JUMP;  /* always true; do nothing */

+      break;

+    }

+    default: {

+      pc = jumponcond(fs, e, 0);  /* jump when false */

+      break;

+    }

+  }

+  luaK_concat(fs, &e->f, pc);  /* insert new jump in false list */

+  luaK_patchtohere(fs, e->t);  /* true list jumps to here (to go through) */

+  e->t = NO_JUMP;

+}

+

+

+/*

+** Emit code to go through if 'e' is false, jump otherwise.

+*/

+void luaK_goiffalse (FuncState *fs, expdesc *e) {

+  int pc;  /* pc of new jump */

+  luaK_dischargevars(fs, e);

+  switch (e->k) {

+    case VJMP: {

+      pc = e->u.info;  /* already jump if true */

+      break;

+    }

+    case VNIL: case VFALSE: {

+      pc = NO_JUMP;  /* always false; do nothing */

+      break;

+    }

+    default: {

+      pc = jumponcond(fs, e, 1);  /* jump if true */

+      break;

+    }

+  }

+  luaK_concat(fs, &e->t, pc);  /* insert new jump in 't' list */

+  luaK_patchtohere(fs, e->f);  /* false list jumps to here (to go through) */

+  e->f = NO_JUMP;

+}

+

+

+/*

+** Code 'not e', doing constant folding.

+*/

+static void codenot (FuncState *fs, expdesc *e) {

+  switch (e->k) {

+    case VNIL: case VFALSE: {

+      e->k = VTRUE;  /* true == not nil == not false */

+      break;

+    }

+    case VK: case VKFLT: case VKINT: case VKSTR: case VTRUE: {

+      e->k = VFALSE;  /* false == not "x" == not 0.5 == not 1 == not true */

+      break;

+    }

+    case VJMP: {

+      negatecondition(fs, e);

+      break;

+    }

+    case VRELOC:

+    case VNONRELOC: {

+      discharge2anyreg(fs, e);

+      freeexp(fs, e);

+      e->u.info = luaK_codeABC(fs, OP_NOT, 0, e->u.info, 0);

+      e->k = VRELOC;

+      break;

+    }

+    default: lua_assert(0);  /* cannot happen */

+  }

+  /* interchange true and false lists */

+  { int temp = e->f; e->f = e->t; e->t = temp; }

+  removevalues(fs, e->f);  /* values are useless when negated */

+  removevalues(fs, e->t);

+}

+

+

+/*

+** Check whether expression 'e' is a small literal string

+*/

+static int isKstr (FuncState *fs, expdesc *e) {

+  return (e->k == VK && !hasjumps(e) && e->u.info <= MAXARG_B &&

+          ttisshrstring(&fs->f->k[e->u.info]));

+}

+

+/*

+** Check whether expression 'e' is a literal integer.

+*/

+int luaK_isKint (expdesc *e) {

+  return (e->k == VKINT && !hasjumps(e));

+}

+

+

+/*

+** Check whether expression 'e' is a literal integer in

+** proper range to fit in register C

+*/

+static int isCint (expdesc *e) {

+  return luaK_isKint(e) && (l_castS2U(e->u.ival) <= l_castS2U(MAXARG_C));

+}

+

+

+/*

+** Check whether expression 'e' is a literal integer in

+** proper range to fit in register sC

+*/

+static int isSCint (expdesc *e) {

+  return luaK_isKint(e) && fitsC(e->u.ival);

+}

+

+

+/*

+** Check whether expression 'e' is a literal integer or float in

+** proper range to fit in a register (sB or sC).

+*/

+static int isSCnumber (expdesc *e, int *pi, int *isfloat) {

+  lua_Integer i;

+  if (e->k == VKINT)

+    i = e->u.ival;

+  else if (e->k == VKFLT && luaV_flttointeger(e->u.nval, &i, F2Ieq))

+    *isfloat = 1;

+  else

+    return 0;  /* not a number */

+  if (!hasjumps(e) && fitsC(i)) {

+    *pi = int2sC(cast_int(i));

+    return 1;

+  }

+  else

+    return 0;

+}

+

+

+/*

+** Create expression 't[k]'. 't' must have its final result already in a

+** register or upvalue. Upvalues can only be indexed by literal strings.

+** Keys can be literal strings in the constant table or arbitrary

+** values in registers.

+*/

+void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k) {

+  if (k->k == VKSTR)

+    str2K(fs, k);

+  lua_assert(!hasjumps(t) &&

+             (t->k == VLOCAL || t->k == VNONRELOC || t->k == VUPVAL));

+  if (t->k == VUPVAL && !isKstr(fs, k))  /* upvalue indexed by non 'Kstr'? */

+    luaK_exp2anyreg(fs, t);  /* put it in a register */

+  if (t->k == VUPVAL) {

+    t->u.ind.t = t->u.info;  /* upvalue index */

+    t->u.ind.idx = k->u.info;  /* literal string */

+    t->k = VINDEXUP;

+  }

+  else {

+    /* register index of the table */

+    t->u.ind.t = (t->k == VLOCAL) ? t->u.var.sidx: t->u.info;

+    if (isKstr(fs, k)) {

+      t->u.ind.idx = k->u.info;  /* literal string */

+      t->k = VINDEXSTR;

+    }

+    else if (isCint(k)) {

+      t->u.ind.idx = cast_int(k->u.ival);  /* int. constant in proper range */

+      t->k = VINDEXI;

+    }

+    else {

+      t->u.ind.idx = luaK_exp2anyreg(fs, k);  /* register */

+      t->k = VINDEXED;

+    }

+  }

+}

+

+

+/*

+** Return false if folding can raise an error.

+** Bitwise operations need operands convertible to integers; division

+** operations cannot have 0 as divisor.

+*/

+static int validop (int op, TValue *v1, TValue *v2) {

+  switch (op) {

+    case LUA_OPBAND: case LUA_OPBOR: case LUA_OPBXOR:

+    case LUA_OPSHL: case LUA_OPSHR: case LUA_OPBNOT: {  /* conversion errors */

+      lua_Integer i;

+      return (tointegerns(v1, &i) && tointegerns(v2, &i));

+    }

+    case LUA_OPDIV: case LUA_OPIDIV: case LUA_OPMOD:  /* division by 0 */

+      return (nvalue(v2) != 0);

+    default: return 1;  /* everything else is valid */

+  }

+}

+

+

+/*

+** Try to "constant-fold" an operation; return 1 iff successful.

+** (In this case, 'e1' has the final result.)

+*/

+static int constfolding (FuncState *fs, int op, expdesc *e1,

+                                        const expdesc *e2) {

+  TValue v1, v2, res;

+  if (!tonumeral(e1, &v1) || !tonumeral(e2, &v2) || !validop(op, &v1, &v2))

+    return 0;  /* non-numeric operands or not safe to fold */

+  luaO_rawarith(fs->ls->L, op, &v1, &v2, &res);  /* does operation */

+  if (ttisinteger(&res)) {

+    e1->k = VKINT;

+    e1->u.ival = ivalue(&res);

+  }

+  else {  /* folds neither NaN nor 0.0 (to avoid problems with -0.0) */

+    lua_Number n = fltvalue(&res);

+    if (luai_numisnan(n) || n == 0)

+      return 0;

+    e1->k = VKFLT;

+    e1->u.nval = n;

+  }

+  return 1;

+}

+

+

+/*

+** Emit code for unary expressions that "produce values"

+** (everything but 'not').

+** Expression to produce final result will be encoded in 'e'.

+*/

+static void codeunexpval (FuncState *fs, OpCode op, expdesc *e, int line) {

+  int r = luaK_exp2anyreg(fs, e);  /* opcodes operate only on registers */

+  freeexp(fs, e);

+  e->u.info = luaK_codeABC(fs, op, 0, r, 0);  /* generate opcode */

+  e->k = VRELOC;  /* all those operations are relocatable */

+  luaK_fixline(fs, line);

+}

+

+

+/*

+** Emit code for binary expressions that "produce values"

+** (everything but logical operators 'and'/'or' and comparison

+** operators).

+** Expression to produce final result will be encoded in 'e1'.

+*/

+static void finishbinexpval (FuncState *fs, expdesc *e1, expdesc *e2,

+                             OpCode op, int v2, int flip, int line,

+                             OpCode mmop, TMS event) {

+  int v1 = luaK_exp2anyreg(fs, e1);

+  int pc = luaK_codeABCk(fs, op, 0, v1, v2, 0);

+  freeexps(fs, e1, e2);

+  e1->u.info = pc;

+  e1->k = VRELOC;  /* all those operations are relocatable */

+  luaK_fixline(fs, line);

+  luaK_codeABCk(fs, mmop, v1, v2, event, flip);  /* to call metamethod */

+  luaK_fixline(fs, line);

+}

+

+

+/*

+** Emit code for binary expressions that "produce values" over

+** two registers.

+*/

+static void codebinexpval (FuncState *fs, OpCode op,

+                           expdesc *e1, expdesc *e2, int line) {

+  int v2 = luaK_exp2anyreg(fs, e2);  /* both operands are in registers */

+  lua_assert(OP_ADD <= op && op <= OP_SHR);

+  finishbinexpval(fs, e1, e2, op, v2, 0, line, OP_MMBIN,

+                  cast(TMS, (op - OP_ADD) + TM_ADD));

+}

+

+

+/*

+** Code binary operators with immediate operands.

+*/

+static void codebini (FuncState *fs, OpCode op,

+                       expdesc *e1, expdesc *e2, int flip, int line,

+                       TMS event) {

+  int v2 = int2sC(cast_int(e2->u.ival));  /* immediate operand */

+  lua_assert(e2->k == VKINT);

+  finishbinexpval(fs, e1, e2, op, v2, flip, line, OP_MMBINI, event);

+}

+

+

+/* Try to code a binary operator negating its second operand.

+** For the metamethod, 2nd operand must keep its original value.

+*/

+static int finishbinexpneg (FuncState *fs, expdesc *e1, expdesc *e2,

+                             OpCode op, int line, TMS event) {

+  if (!luaK_isKint(e2))

+    return 0;  /* not an integer constant */

+  else {

+    lua_Integer i2 = e2->u.ival;

+    if (!(fitsC(i2) && fitsC(-i2)))

+      return 0;  /* not in the proper range */

+    else {  /* operating a small integer constant */

+      int v2 = cast_int(i2);

+      finishbinexpval(fs, e1, e2, op, int2sC(-v2), 0, line, OP_MMBINI, event);

+      /* correct metamethod argument */

+      SETARG_B(fs->f->code[fs->pc - 1], int2sC(v2));

+      return 1;  /* successfully coded */

+    }

+  }

+}

+

+

+static void swapexps (expdesc *e1, expdesc *e2) {

+  expdesc temp = *e1; *e1 = *e2; *e2 = temp;  /* swap 'e1' and 'e2' */

+}

+

+

+/*

+** Code arithmetic operators ('+', '-', ...). If second operand is a

+** constant in the proper range, use variant opcodes with K operands.

+*/

+static void codearith (FuncState *fs, BinOpr opr,

+                       expdesc *e1, expdesc *e2, int flip, int line) {

+  TMS event = cast(TMS, opr + TM_ADD);

+  if (tonumeral(e2, NULL) && luaK_exp2K(fs, e2)) {  /* K operand? */

+    int v2 = e2->u.info;  /* K index */

+    OpCode op = cast(OpCode, opr + OP_ADDK);

+    finishbinexpval(fs, e1, e2, op, v2, flip, line, OP_MMBINK, event);

+  }

+  else {  /* 'e2' is neither an immediate nor a K operand */

+    OpCode op = cast(OpCode, opr + OP_ADD);

+    if (flip)

+      swapexps(e1, e2);  /* back to original order */

+    codebinexpval(fs, op, e1, e2, line);  /* use standard operators */

+  }

+}

+

+

+/*

+** Code commutative operators ('+', '*'). If first operand is a

+** numeric constant, change order of operands to try to use an

+** immediate or K operator.

+*/

+static void codecommutative (FuncState *fs, BinOpr op,

+                             expdesc *e1, expdesc *e2, int line) {

+  int flip = 0;

+  if (tonumeral(e1, NULL)) {  /* is first operand a numeric constant? */

+    swapexps(e1, e2);  /* change order */

+    flip = 1;

+  }

+  if (op == OPR_ADD && isSCint(e2))  /* immediate operand? */

+    codebini(fs, cast(OpCode, OP_ADDI), e1, e2, flip, line, TM_ADD);

+  else

+    codearith(fs, op, e1, e2, flip, line);

+}

+

+

+/*

+** Code bitwise operations; they are all associative, so the function

+** tries to put an integer constant as the 2nd operand (a K operand).

+*/

+static void codebitwise (FuncState *fs, BinOpr opr,

+                         expdesc *e1, expdesc *e2, int line) {

+  int flip = 0;

+  int v2;

+  OpCode op;

+  if (e1->k == VKINT && luaK_exp2RK(fs, e1)) {

+    swapexps(e1, e2);  /* 'e2' will be the constant operand */

+    flip = 1;

+  }

+  else if (!(e2->k == VKINT && luaK_exp2RK(fs, e2))) {  /* no constants? */

+    op = cast(OpCode, opr + OP_ADD);

+    codebinexpval(fs, op, e1, e2, line);  /* all-register opcodes */

+    return;

+  }

+  v2 = e2->u.info;  /* index in K array */

+  op = cast(OpCode, opr + OP_ADDK);

+  lua_assert(ttisinteger(&fs->f->k[v2]));

+  finishbinexpval(fs, e1, e2, op, v2, flip, line, OP_MMBINK,

+                  cast(TMS, opr + TM_ADD));

+}

+

+

+/*

+** Emit code for order comparisons. When using an immediate operand,

+** 'isfloat' tells whether the original value was a float.

+*/

+static void codeorder (FuncState *fs, OpCode op, expdesc *e1, expdesc *e2) {

+  int r1, r2;

+  int im;

+  int isfloat = 0;

+  if (isSCnumber(e2, &im, &isfloat)) {

+    /* use immediate operand */

+    r1 = luaK_exp2anyreg(fs, e1);

+    r2 = im;

+    op = cast(OpCode, (op - OP_LT) + OP_LTI);

+  }

+  else if (isSCnumber(e1, &im, &isfloat)) {

+    /* transform (A < B) to (B > A) and (A <= B) to (B >= A) */

+    r1 = luaK_exp2anyreg(fs, e2);

+    r2 = im;

+    op = (op == OP_LT) ? OP_GTI : OP_GEI;

+  }

+  else {  /* regular case, compare two registers */

+    r1 = luaK_exp2anyreg(fs, e1);

+    r2 = luaK_exp2anyreg(fs, e2);

+  }

+  freeexps(fs, e1, e2);

+  e1->u.info = condjump(fs, op, r1, r2, isfloat, 1);

+  e1->k = VJMP;

+}

+

+

+/*

+** Emit code for equality comparisons ('==', '~=').

+** 'e1' was already put as RK by 'luaK_infix'.

+*/

+static void codeeq (FuncState *fs, BinOpr opr, expdesc *e1, expdesc *e2) {

+  int r1, r2;

+  int im;

+  int isfloat = 0;  /* not needed here, but kept for symmetry */

+  OpCode op;

+  if (e1->k != VNONRELOC) {

+    lua_assert(e1->k == VK || e1->k == VKINT || e1->k == VKFLT);

+    swapexps(e1, e2);

+  }

+  r1 = luaK_exp2anyreg(fs, e1);  /* 1st expression must be in register */

+  if (isSCnumber(e2, &im, &isfloat)) {

+    op = OP_EQI;

+    r2 = im;  /* immediate operand */

+  }

+  else if (luaK_exp2RK(fs, e2)) {  /* 1st expression is constant? */

+    op = OP_EQK;

+    r2 = e2->u.info;  /* constant index */

+  }

+  else {

+    op = OP_EQ;  /* will compare two registers */

+    r2 = luaK_exp2anyreg(fs, e2);

+  }

+  freeexps(fs, e1, e2);

+  e1->u.info = condjump(fs, op, r1, r2, isfloat, (opr == OPR_EQ));

+  e1->k = VJMP;

+}

+

+

+/*

+** Apply prefix operation 'op' to expression 'e'.

+*/

+void luaK_prefix (FuncState *fs, UnOpr op, expdesc *e, int line) {

+  static const expdesc ef = {VKINT, {0}, NO_JUMP, NO_JUMP};

+  luaK_dischargevars(fs, e);

+  switch (op) {

+    case OPR_MINUS: case OPR_BNOT:  /* use 'ef' as fake 2nd operand */

+      if (constfolding(fs, op + LUA_OPUNM, e, &ef))

+        break;

+      /* else */ /* FALLTHROUGH */

+    case OPR_LEN:

+      codeunexpval(fs, cast(OpCode, op + OP_UNM), e, line);

+      break;

+    case OPR_NOT: codenot(fs, e); break;

+    default: lua_assert(0);

+  }

+}

+

+

+/*

+** Process 1st operand 'v' of binary operation 'op' before reading

+** 2nd operand.

+*/

+void luaK_infix (FuncState *fs, BinOpr op, expdesc *v) {

+  luaK_dischargevars(fs, v);

+  switch (op) {

+    case OPR_AND: {

+      luaK_goiftrue(fs, v);  /* go ahead only if 'v' is true */

+      break;

+    }

+    case OPR_OR: {

+      luaK_goiffalse(fs, v);  /* go ahead only if 'v' is false */

+      break;

+    }

+    case OPR_CONCAT: {

+      luaK_exp2nextreg(fs, v);  /* operand must be on the stack */

+      break;

+    }

+    case OPR_ADD: case OPR_SUB:

+    case OPR_MUL: case OPR_DIV: case OPR_IDIV:

+    case OPR_MOD: case OPR_POW:

+    case OPR_BAND: case OPR_BOR: case OPR_BXOR:

+    case OPR_SHL: case OPR_SHR: {

+      if (!tonumeral(v, NULL))

+        luaK_exp2anyreg(fs, v);

+      /* else keep numeral, which may be folded with 2nd operand */

+      break;

+    }

+    case OPR_EQ: case OPR_NE: {

+      if (!tonumeral(v, NULL))

+        luaK_exp2RK(fs, v);

+      /* else keep numeral, which may be an immediate operand */

+      break;

+    }

+    case OPR_LT: case OPR_LE:

+    case OPR_GT: case OPR_GE: {

+      int dummy, dummy2;

+      if (!isSCnumber(v, &dummy, &dummy2))

+        luaK_exp2anyreg(fs, v);

+      /* else keep numeral, which may be an immediate operand */

+      break;

+    }

+    default: lua_assert(0);

+  }

+}

+

+/*

+** Create code for '(e1 .. e2)'.

+** For '(e1 .. e2.1 .. e2.2)' (which is '(e1 .. (e2.1 .. e2.2))',

+** because concatenation is right associative), merge both CONCATs.

+*/

+static void codeconcat (FuncState *fs, expdesc *e1, expdesc *e2, int line) {

+  Instruction *ie2 = previousinstruction(fs);

+  if (GET_OPCODE(*ie2) == OP_CONCAT) {  /* is 'e2' a concatenation? */

+    int n = GETARG_B(*ie2);  /* # of elements concatenated in 'e2' */

+    lua_assert(e1->u.info + 1 == GETARG_A(*ie2));

+    freeexp(fs, e2);

+    SETARG_A(*ie2, e1->u.info);  /* correct first element ('e1') */

+    SETARG_B(*ie2, n + 1);  /* will concatenate one more element */

+  }

+  else {  /* 'e2' is not a concatenation */

+    luaK_codeABC(fs, OP_CONCAT, e1->u.info, 2, 0);  /* new concat opcode */

+    freeexp(fs, e2);

+    luaK_fixline(fs, line);

+  }

+}

+

+

+/*

+** Finalize code for binary operation, after reading 2nd operand.

+*/

+void luaK_posfix (FuncState *fs, BinOpr opr,

+                  expdesc *e1, expdesc *e2, int line) {

+  luaK_dischargevars(fs, e2);

+  if (foldbinop(opr) && constfolding(fs, opr + LUA_OPADD, e1, e2))

+    return;  /* done by folding */

+  switch (opr) {

+    case OPR_AND: {

+      lua_assert(e1->t == NO_JUMP);  /* list closed by 'luaK_infix' */

+      luaK_concat(fs, &e2->f, e1->f);

+      *e1 = *e2;

+      break;

+    }

+    case OPR_OR: {

+      lua_assert(e1->f == NO_JUMP);  /* list closed by 'luaK_infix' */

+      luaK_concat(fs, &e2->t, e1->t);

+      *e1 = *e2;

+      break;

+    }

+    case OPR_CONCAT: {  /* e1 .. e2 */

+      luaK_exp2nextreg(fs, e2);

+      codeconcat(fs, e1, e2, line);

+      break;

+    }

+    case OPR_ADD: case OPR_MUL: {

+      codecommutative(fs, opr, e1, e2, line);

+      break;

+    }

+    case OPR_SUB: {

+      if (finishbinexpneg(fs, e1, e2, OP_ADDI, line, TM_SUB))

+        break; /* coded as (r1 + -I) */

+      /* ELSE */

+    }  /* FALLTHROUGH */

+    case OPR_DIV: case OPR_IDIV: case OPR_MOD: case OPR_POW: {

+      codearith(fs, opr, e1, e2, 0, line);

+      break;

+    }

+    case OPR_BAND: case OPR_BOR: case OPR_BXOR: {

+      codebitwise(fs, opr, e1, e2, line);

+      break;

+    }

+    case OPR_SHL: {

+      if (isSCint(e1)) {

+        swapexps(e1, e2);

+        codebini(fs, OP_SHLI, e1, e2, 1, line, TM_SHL);  /* I << r2 */

+      }

+      else if (finishbinexpneg(fs, e1, e2, OP_SHRI, line, TM_SHL)) {

+        /* coded as (r1 >> -I) */;

+      }

+      else  /* regular case (two registers) */

+       codebinexpval(fs, OP_SHL, e1, e2, line);

+      break;

+    }

+    case OPR_SHR: {

+      if (isSCint(e2))

+        codebini(fs, OP_SHRI, e1, e2, 0, line, TM_SHR);  /* r1 >> I */

+      else  /* regular case (two registers) */

+        codebinexpval(fs, OP_SHR, e1, e2, line);

+      break;

+    }

+    case OPR_EQ: case OPR_NE: {

+      codeeq(fs, opr, e1, e2);

+      break;

+    }

+    case OPR_LT: case OPR_LE: {

+      OpCode op = cast(OpCode, (opr - OPR_EQ) + OP_EQ);

+      codeorder(fs, op, e1, e2);

+      break;

+    }

+    case OPR_GT: case OPR_GE: {

+      /* '(a > b)' <=> '(b < a)';  '(a >= b)' <=> '(b <= a)' */

+      OpCode op = cast(OpCode, (opr - OPR_NE) + OP_EQ);

+      swapexps(e1, e2);

+      codeorder(fs, op, e1, e2);

+      break;

+    }

+    default: lua_assert(0);

+  }

+}

+

+

+/*

+** Change line information associated with current position, by removing

+** previous info and adding it again with new line.

+*/

+void luaK_fixline (FuncState *fs, int line) {

+  removelastlineinfo(fs);

+  savelineinfo(fs, fs->f, line);

+}

+

+

+void luaK_settablesize (FuncState *fs, int pc, int ra, int asize, int hsize) {

+  Instruction *inst = &fs->f->code[pc];

+  int rb = (hsize != 0) ? luaO_ceillog2(hsize) + 1 : 0;  /* hash size */

+  int extra = asize / (MAXARG_C + 1);  /* higher bits of array size */

+  int rc = asize % (MAXARG_C + 1);  /* lower bits of array size */

+  int k = (extra > 0);  /* true iff needs extra argument */

+  *inst = CREATE_ABCk(OP_NEWTABLE, ra, rb, rc, k);

+  *(inst + 1) = CREATE_Ax(OP_EXTRAARG, extra);

+}

+

+

+/*

+** Emit a SETLIST instruction.

+** 'base' is register that keeps table;

+** 'nelems' is #table plus those to be stored now;

+** 'tostore' is number of values (in registers 'base + 1',...) to add to

+** table (or LUA_MULTRET to add up to stack top).

+*/

+void luaK_setlist (FuncState *fs, int base, int nelems, int tostore) {

+  lua_assert(tostore != 0 && tostore <= LFIELDS_PER_FLUSH);

+  if (tostore == LUA_MULTRET)

+    tostore = 0;

+  if (nelems <= MAXARG_C)

+    luaK_codeABC(fs, OP_SETLIST, base, tostore, nelems);

+  else {

+    int extra = nelems / (MAXARG_C + 1);

+    nelems %= (MAXARG_C + 1);

+    luaK_codeABCk(fs, OP_SETLIST, base, tostore, nelems, 1);

+    codeextraarg(fs, extra);

+  }

+  fs->freereg = base + 1;  /* free registers with list values */

+}

+

+

+/*

+** return the final target of a jump (skipping jumps to jumps)

+*/

+static int finaltarget (Instruction *code, int i) {

+  int count;

+  for (count = 0; count < 100; count++) {  /* avoid infinite loops */

+    Instruction pc = code[i];

+    if (GET_OPCODE(pc) != OP_JMP)

+      break;

+     else

+       i += GETARG_sJ(pc) + 1;

+  }

+  return i;

+}

+

+

+/*

+** Do a final pass over the code of a function, doing small peephole

+** optimizations and adjustments.

+*/

+void luaK_finish (FuncState *fs) {

+  int i;

+  Proto *p = fs->f;

+  for (i = 0; i < fs->pc; i++) {

+    Instruction *pc = &p->code[i];

+    lua_assert(i == 0 || isOT(*(pc - 1)) == isIT(*pc));

+    switch (GET_OPCODE(*pc)) {

+      case OP_RETURN0: case OP_RETURN1: {

+        if (!(fs->needclose || p->is_vararg))

+          break;  /* no extra work */

+        /* else use OP_RETURN to do the extra work */

+        SET_OPCODE(*pc, OP_RETURN);

+      }  /* FALLTHROUGH */

+      case OP_RETURN: case OP_TAILCALL: {

+        if (fs->needclose)

+          SETARG_k(*pc, 1);  /* signal that it needs to close */

+        if (p->is_vararg)

+          SETARG_C(*pc, p->numparams + 1);  /* signal that it is vararg */

+        break;

+      }

+      case OP_JMP: {

+        int target = finaltarget(p->code, i);

+        fixjump(fs, i, target);

+        break;

+      }

+      default: break;

+    }

+  }

+}

--- /dev/null

+++ b/lcode.h

@@ -1,0 +1,104 @@

+/*

+** $Id: lcode.h $

+** Code generator for Lua

+** See Copyright Notice in lua.h

+*/

+

+#ifndef lcode_h

+#define lcode_h

+

+#include "llex.h"

+#include "lobject.h"

+#include "lopcodes.h"

+#include "lparser.h"

+

+

+/*

+** Marks the end of a patch list. It is an invalid value both as an absolute

+** address, and as a list link (would link an element to itself).

+*/

+#define NO_JUMP (-1)

+

+

+/*

+** grep "ORDER OPR" if you change these enums  (ORDER OP)

+*/

+typedef enum BinOpr {

+  /* arithmetic operators */

+  OPR_ADD, OPR_SUB, OPR_MUL, OPR_MOD, OPR_POW,

+  OPR_DIV, OPR_IDIV,

+  /* bitwise operators */

+  OPR_BAND, OPR_BOR, OPR_BXOR,

+  OPR_SHL, OPR_SHR,

+  /* string operator */

+  OPR_CONCAT,

+  /* comparison operators */

+  OPR_EQ, OPR_LT, OPR_LE,

+  OPR_NE, OPR_GT, OPR_GE,

+  /* logical operators */

+  OPR_AND, OPR_OR,

+  OPR_NOBINOPR

+} BinOpr;

+

+

+/* true if operation is foldable (that is, it is arithmetic or bitwise) */

+#define foldbinop(op)	((op) <= OPR_SHR)

+

+

+#define luaK_codeABC(fs,o,a,b,c)	luaK_codeABCk(fs,o,a,b,c,0)

+

+

+typedef enum UnOpr { OPR_MINUS, OPR_BNOT, OPR_NOT, OPR_LEN, OPR_NOUNOPR } UnOpr;

+

+

+/* get (pointer to) instruction of given 'expdesc' */

+#define getinstruction(fs,e)	((fs)->f->code[(e)->u.info])

+

+

+#define luaK_setmultret(fs,e)	luaK_setreturns(fs, e, LUA_MULTRET)

+

+#define luaK_jumpto(fs,t)	luaK_patchlist(fs, luaK_jump(fs), t)

+

+LUAI_FUNC int luaK_code (FuncState *fs, Instruction i);

+LUAI_FUNC int luaK_codeABx (FuncState *fs, OpCode o, int A, unsigned int Bx);

+LUAI_FUNC int luaK_codeAsBx (FuncState *fs, OpCode o, int A, int Bx);

+LUAI_FUNC int luaK_codeABCk (FuncState *fs, OpCode o, int A,

+                                            int B, int C, int k);

+LUAI_FUNC int luaK_isKint (expdesc *e);

+LUAI_FUNC int luaK_exp2const (FuncState *fs, const expdesc *e, TValue *v);

+LUAI_FUNC void luaK_fixline (FuncState *fs, int line);

+LUAI_FUNC void luaK_nil (FuncState *fs, int from, int n);

+LUAI_FUNC void luaK_reserveregs (FuncState *fs, int n);

+LUAI_FUNC void luaK_checkstack (FuncState *fs, int n);

+LUAI_FUNC void luaK_int (FuncState *fs, int reg, lua_Integer n);

+LUAI_FUNC void luaK_dischargevars (FuncState *fs, expdesc *e);

+LUAI_FUNC int luaK_exp2anyreg (FuncState *fs, expdesc *e);

+LUAI_FUNC void luaK_exp2anyregup (FuncState *fs, expdesc *e);

+LUAI_FUNC void luaK_exp2nextreg (FuncState *fs, expdesc *e);

+LUAI_FUNC void luaK_exp2val (FuncState *fs, expdesc *e);

+LUAI_FUNC int luaK_exp2RK (FuncState *fs, expdesc *e);

+LUAI_FUNC void luaK_self (FuncState *fs, expdesc *e, expdesc *key);

+LUAI_FUNC void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k);

+LUAI_FUNC void luaK_goiftrue (FuncState *fs, expdesc *e);

+LUAI_FUNC void luaK_goiffalse (FuncState *fs, expdesc *e);

+LUAI_FUNC void luaK_storevar (FuncState *fs, expdesc *var, expdesc *e);

+LUAI_FUNC void luaK_setreturns (FuncState *fs, expdesc *e, int nresults);

+LUAI_FUNC void luaK_setoneret (FuncState *fs, expdesc *e);

+LUAI_FUNC int luaK_jump (FuncState *fs);

+LUAI_FUNC void luaK_ret (FuncState *fs, int first, int nret);

+LUAI_FUNC void luaK_patchlist (FuncState *fs, int list, int target);

+LUAI_FUNC void luaK_patchtohere (FuncState *fs, int list);

+LUAI_FUNC void luaK_concat (FuncState *fs, int *l1, int l2);

+LUAI_FUNC int luaK_getlabel (FuncState *fs);

+LUAI_FUNC void luaK_prefix (FuncState *fs, UnOpr op, expdesc *v, int line);

+LUAI_FUNC void luaK_infix (FuncState *fs, BinOpr op, expdesc *v);

+LUAI_FUNC void luaK_posfix (FuncState *fs, BinOpr op, expdesc *v1,

+                            expdesc *v2, int line);

+LUAI_FUNC void luaK_settablesize (FuncState *fs, int pc,

+                                  int ra, int asize, int hsize);

+LUAI_FUNC void luaK_setlist (FuncState *fs, int base, int nelems, int tostore);

+LUAI_FUNC void luaK_finish (FuncState *fs);

+LUAI_FUNC l_noret luaK_semerror (LexState *ls, const char *msg);

+

+

+#endif

--- /dev/null

+++ b/lcorolib.c

@@ -1,0 +1,207 @@

+/*

+** $Id: lcorolib.c $

+** Coroutine Library

+** See Copyright Notice in lua.h

+*/

+

+#define lcorolib_c

+#define LUA_LIB

+

+#include "lprefix.h"

+

+

+#include <stdlib.h>

+

+#include "lua.h"

+

+#include "lauxlib.h"

+#include "lualib.h"

+

+

+static lua_State *getco (lua_State *L) {

+  lua_State *co = lua_tothread(L, 1);

+  luaL_argexpected(L, co, 1, "thread");

+  return co;

+}

+

+

+/*

+** Resumes a coroutine. Returns the number of results for non-error

+** cases or -1 for errors.

+*/

+static int auxresume (lua_State *L, lua_State *co, int narg) {

+  int status, nres;

+  if (!lua_checkstack(co, narg)) {

+    lua_pushliteral(L, "too many arguments to resume");

+    return -1;  /* error flag */

+  }

+  lua_xmove(L, co, narg);

+  status = lua_resume(co, L, narg, &nres);

+  if (status == LUA_OK || status == LUA_YIELD) {

+    if (!lua_checkstack(L, nres + 1)) {

+      lua_pop(co, nres);  /* remove results anyway */

+      lua_pushliteral(L, "too many results to resume");

+      return -1;  /* error flag */

+    }

+    lua_xmove(co, L, nres);  /* move yielded values */

+    return nres;

+  }

+  else {

+    lua_xmove(co, L, 1);  /* move error message */

+    return -1;  /* error flag */

+  }

+}

+

+

+static int luaB_coresume (lua_State *L) {

+  lua_State *co = getco(L);

+  int r;

+  r = auxresume(L, co, lua_gettop(L) - 1);

+  if (r < 0) {

+    lua_pushboolean(L, 0);

+    lua_insert(L, -2);

+    return 2;  /* return false + error message */

+  }

+  else {

+    lua_pushboolean(L, 1);

+    lua_insert(L, -(r + 1));

+    return r + 1;  /* return true + 'resume' returns */

+  }

+}

+

+

+static int luaB_auxwrap (lua_State *L) {

+  lua_State *co = lua_tothread(L, lua_upvalueindex(1));

+  int r = auxresume(L, co, lua_gettop(L));

+  if (r < 0) {  /* error? */

+    int stat = lua_status(co);

+    if (stat != LUA_OK && stat != LUA_YIELD)  /* error in the coroutine? */

+      lua_resetthread(co);  /* close its tbc variables */

+    if (stat != LUA_ERRMEM &&  /* not a memory error and ... */

+        lua_type(L, -1) == LUA_TSTRING) {  /* ... error object is a string? */

+      luaL_where(L, 1);  /* add extra info, if available */

+      lua_insert(L, -2);

+      lua_concat(L, 2);

+    }

+    return lua_error(L);  /* propagate error */

+  }

+  return r;

+}

+

+

+static int luaB_cocreate (lua_State *L) {

+  lua_State *NL;

+  luaL_checktype(L, 1, LUA_TFUNCTION);

+  NL = lua_newthread(L);

+  lua_pushvalue(L, 1);  /* move function to top */

+  lua_xmove(L, NL, 1);  /* move function from L to NL */

+  return 1;

+}

+

+

+static int luaB_cowrap (lua_State *L) {

+  luaB_cocreate(L);

+  lua_pushcclosure(L, luaB_auxwrap, 1);

+  return 1;

+}

+

+

+static int luaB_yield (lua_State *L) {

+  return lua_yield(L, lua_gettop(L));

+}

+

+

+#define COS_RUN		0

+#define COS_DEAD	1

+#define COS_YIELD	2

+#define COS_NORM	3

+

+

+static const char *const statname[] =

+  {"running", "dead", "suspended", "normal"};

+

+

+static int auxstatus (lua_State *L, lua_State *co) {

+  if (L == co) return COS_RUN;

+  else {

+    switch (lua_status(co)) {

+      case LUA_YIELD:

+        return COS_YIELD;

+      case LUA_OK: {

+        lua_Debug ar;

+        if (lua_getstack(co, 0, &ar))  /* does it have frames? */

+          return COS_NORM;  /* it is running */

+        else if (lua_gettop(co) == 0)

+            return COS_DEAD;

+        else

+          return COS_YIELD;  /* initial state */

+      }

+      default:  /* some error occurred */

+        return COS_DEAD;

+    }

+  }

+}

+

+

+static int luaB_costatus (lua_State *L) {

+  lua_State *co = getco(L);

+  lua_pushstring(L, statname[auxstatus(L, co)]);

+  return 1;

+}

+

+

+static int luaB_yieldable (lua_State *L) {

+  lua_State *co = lua_isnone(L, 1) ? L : getco(L);

+  lua_pushboolean(L, lua_isyieldable(co));

+  return 1;

+}

+

+

+static int luaB_corunning (lua_State *L) {

+  int ismain = lua_pushthread(L);

+  lua_pushboolean(L, ismain);

+  return 2;

+}

+

+

+static int luaB_close (lua_State *L) {

+  lua_State *co = getco(L);

+  int status = auxstatus(L, co);

+  switch (status) {

+    case COS_DEAD: case COS_YIELD: {

+      status = lua_resetthread(co);

+      if (status == LUA_OK) {

+        lua_pushboolean(L, 1);

+        return 1;

+      }

+      else {

+        lua_pushboolean(L, 0);

+        lua_xmove(co, L, 1);  /* copy error message */

+        return 2;

+      }

+    }

+    default:  /* normal or running coroutine */

+      return luaL_error(L, "cannot close a %s coroutine", statname[status]);

+  }

+}

+

+

+static const luaL_Reg co_funcs[] = {

+  {"create", luaB_cocreate},

+  {"resume", luaB_coresume},

+  {"running", luaB_corunning},

+  {"status", luaB_costatus},

+  {"wrap", luaB_cowrap},

+  {"yield", luaB_yield},

+  {"isyieldable", luaB_yieldable},

+  {"close", luaB_close},

+  {NULL, NULL}

+};

+

+

+

+LUAMOD_API int luaopen_coroutine (lua_State *L) {

+  luaL_newlib(L, co_funcs);

+  return 1;

+}

+

--- /dev/null

+++ b/lctype.c

@@ -1,0 +1,64 @@

+/*

+** $Id: lctype.c $

+** 'ctype' functions for Lua

+** See Copyright Notice in lua.h

+*/

+

+#define lctype_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include "lctype.h"

+

+#if !LUA_USE_CTYPE	/* { */

+

+#include <limits.h>

+

+

+#if defined (LUA_UCID)		/* accept UniCode IDentifiers? */

+/* consider all non-ascii codepoints to be alphabetic */

+#define NONA		0x01

+#else

+#define NONA		0x00	/* default */

+#endif

+

+

+LUAI_DDEF const lu_byte luai_ctype_[UCHAR_MAX + 2] = {

+  0x00,  /* EOZ */

+  0x00,  0x00,  0x00,  0x00,  0x00,  0x00,  0x00,  0x00,	/* 0. */

+  0x00,  0x08,  0x08,  0x08,  0x08,  0x08,  0x00,  0x00,

+  0x00,  0x00,  0x00,  0x00,  0x00,  0x00,  0x00,  0x00,	/* 1. */

+  0x00,  0x00,  0x00,  0x00,  0x00,  0x00,  0x00,  0x00,

+  0x0c,  0x04,  0x04,  0x04,  0x04,  0x04,  0x04,  0x04,	/* 2. */

+  0x04,  0x04,  0x04,  0x04,  0x04,  0x04,  0x04,  0x04,

+  0x16,  0x16,  0x16,  0x16,  0x16,  0x16,  0x16,  0x16,	/* 3. */

+  0x16,  0x16,  0x04,  0x04,  0x04,  0x04,  0x04,  0x04,

+  0x04,  0x15,  0x15,  0x15,  0x15,  0x15,  0x15,  0x05,	/* 4. */

+  0x05,  0x05,  0x05,  0x05,  0x05,  0x05,  0x05,  0x05,

+  0x05,  0x05,  0x05,  0x05,  0x05,  0x05,  0x05,  0x05,	/* 5. */

+  0x05,  0x05,  0x05,  0x04,  0x04,  0x04,  0x04,  0x05,

+  0x04,  0x15,  0x15,  0x15,  0x15,  0x15,  0x15,  0x05,	/* 6. */

+  0x05,  0x05,  0x05,  0x05,  0x05,  0x05,  0x05,  0x05,

+  0x05,  0x05,  0x05,  0x05,  0x05,  0x05,  0x05,  0x05,	/* 7. */

+  0x05,  0x05,  0x05,  0x04,  0x04,  0x04,  0x04,  0x00,

+  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,	/* 8. */

+  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,

+  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,	/* 9. */

+  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,

+  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,	/* a. */

+  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,

+  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,	/* b. */

+  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,

+  0x00,  0x00,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,	/* c. */

+  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,

+  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,	/* d. */

+  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,

+  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,	/* e. */

+  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,  NONA,

+  NONA,  NONA,  NONA,  NONA,  NONA,  0x00,  0x00,  0x00,	/* f. */

+  0x00,  0x00,  0x00,  0x00,  0x00,  0x00,  0x00,  0x00

+};

+

+#endif			/* } */

--- /dev/null

+++ b/lctype.h

@@ -1,0 +1,101 @@

+/*

+** $Id: lctype.h $

+** 'ctype' functions for Lua

+** See Copyright Notice in lua.h

+*/

+

+#ifndef lctype_h

+#define lctype_h

+

+#include "lua.h"

+

+

+/*

+** WARNING: the functions defined here do not necessarily correspond

+** to the similar functions in the standard C ctype.h. They are

+** optimized for the specific needs of Lua.

+*/

+

+#if !defined(LUA_USE_CTYPE)

+

+#if 'A' == 65 && '0' == 48

+/* ASCII case: can use its own tables; faster and fixed */

+#define LUA_USE_CTYPE	0

+#else

+/* must use standard C ctype */

+#define LUA_USE_CTYPE	1

+#endif

+

+#endif

+

+

+#if !LUA_USE_CTYPE	/* { */

+

+#include <limits.h>

+

+#include "llimits.h"

+

+

+#define ALPHABIT	0

+#define DIGITBIT	1

+#define PRINTBIT	2

+#define SPACEBIT	3

+#define XDIGITBIT	4

+

+

+#define MASK(B)		(1 << (B))

+

+

+/*

+** add 1 to char to allow index -1 (EOZ)

+*/

+#define testprop(c,p)	(luai_ctype_[(c)+1] & (p))

+

+/*

+** 'lalpha' (Lua alphabetic) and 'lalnum' (Lua alphanumeric) both include '_'

+*/

+#define lislalpha(c)	testprop(c, MASK(ALPHABIT))

+#define lislalnum(c)	testprop(c, (MASK(ALPHABIT) | MASK(DIGITBIT)))

+#define lisdigit(c)	testprop(c, MASK(DIGITBIT))

+#define lisspace(c)	testprop(c, MASK(SPACEBIT))

+#define lisprint(c)	testprop(c, MASK(PRINTBIT))

+#define lisxdigit(c)	testprop(c, MASK(XDIGITBIT))

+

+

+/*

+** In ASCII, this 'ltolower' is correct for alphabetic characters and

+** for '.'. That is enough for Lua needs. ('check_exp' ensures that

+** the character either is an upper-case letter or is unchanged by

+** the transformation, which holds for lower-case letters and '.'.)

+*/

+#define ltolower(c)  \

+  check_exp(('A' <= (c) && (c) <= 'Z') || (c) == ((c) | ('A' ^ 'a')),  \

+            (c) | ('A' ^ 'a'))

+

+

+/* one entry for each character and for -1 (EOZ) */

+LUAI_DDEC(const lu_byte luai_ctype_[UCHAR_MAX + 2];)

+

+

+#else			/* }{ */

+

+/*

+** use standard C ctypes

+*/

+

+#include <ctype.h>

+

+

+#define lislalpha(c)	(isalpha(c) || (c) == '_')

+#define lislalnum(c)	(isalnum(c) || (c) == '_')

+#define lisdigit(c)	(isdigit(c))

+#define lisspace(c)	(isspace(c))

+#define lisprint(c)	(isprint(c))

+#define lisxdigit(c)	(isxdigit(c))

+

+#define ltolower(c)	(tolower(c))

+

+#endif			/* } */

+

+#endif

+

--- /dev/null

+++ b/ldblib.c

@@ -1,0 +1,482 @@

+/*

+** $Id: ldblib.c $

+** Interface from Lua to its debug API

+** See Copyright Notice in lua.h

+*/

+

+#define ldblib_c

+#define LUA_LIB

+

+#include "lprefix.h"

+

+

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "lauxlib.h"

+#include "lualib.h"

+

+

+/*

+** The hook table at registry[HOOKKEY] maps threads to their current

+** hook function.

+*/

+static const char *const HOOKKEY = "_HOOKKEY";

+

+

+/*

+** If L1 != L, L1 can be in any state, and therefore there are no

+** guarantees about its stack space; any push in L1 must be

+** checked.

+*/

+static void checkstack (lua_State *L, lua_State *L1, int n) {

+  if (L != L1 && !lua_checkstack(L1, n))

+    luaL_error(L, "stack overflow");

+}

+

+

+static int db_getregistry (lua_State *L) {

+  lua_pushvalue(L, LUA_REGISTRYINDEX);

+  return 1;

+}

+

+

+static int db_getmetatable (lua_State *L) {

+  luaL_checkany(L, 1);

+  if (!lua_getmetatable(L, 1)) {

+    lua_pushnil(L);  /* no metatable */

+  }

+  return 1;

+}

+

+

+static int db_setmetatable (lua_State *L) {

+  int t = lua_type(L, 2);

+  luaL_argexpected(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table");

+  lua_settop(L, 2);

+  lua_setmetatable(L, 1);

+  return 1;  /* return 1st argument */

+}

+

+

+static int db_getuservalue (lua_State *L) {

+  int n = (int)luaL_optinteger(L, 2, 1);

+  if (lua_type(L, 1) != LUA_TUSERDATA)

+    luaL_pushfail(L);

+  else if (lua_getiuservalue(L, 1, n) != LUA_TNONE) {

+    lua_pushboolean(L, 1);

+    return 2;

+  }

+  return 1;

+}

+

+

+static int db_setuservalue (lua_State *L) {

+  int n = (int)luaL_optinteger(L, 3, 1);

+  luaL_checktype(L, 1, LUA_TUSERDATA);

+  luaL_checkany(L, 2);

+  lua_settop(L, 2);

+  if (!lua_setiuservalue(L, 1, n))

+    luaL_pushfail(L);

+  return 1;

+}

+

+

+/*

+** Auxiliary function used by several library functions: check for

+** an optional thread as function's first argument and set 'arg' with

+** 1 if this argument is present (so that functions can skip it to

+** access their other arguments)

+*/

+static lua_State *getthread (lua_State *L, int *arg) {

+  if (lua_isthread(L, 1)) {

+    *arg = 1;

+    return lua_tothread(L, 1);

+  }

+  else {

+    *arg = 0;

+    return L;  /* function will operate over current thread */

+  }

+}

+

+

+/*

+** Variations of 'lua_settable', used by 'db_getinfo' to put results

+** from 'lua_getinfo' into result table. Key is always a string;

+** value can be a string, an int, or a boolean.

+*/

+static void settabss (lua_State *L, const char *k, const char *v) {

+  lua_pushstring(L, v);

+  lua_setfield(L, -2, k);

+}

+

+static void settabsi (lua_State *L, const char *k, int v) {

+  lua_pushinteger(L, v);

+  lua_setfield(L, -2, k);

+}

+

+static void settabsb (lua_State *L, const char *k, int v) {

+  lua_pushboolean(L, v);

+  lua_setfield(L, -2, k);

+}

+

+

+/*

+** In function 'db_getinfo', the call to 'lua_getinfo' may push

+** results on the stack; later it creates the result table to put

+** these objects. Function 'treatstackoption' puts the result from

+** 'lua_getinfo' on top of the result table so that it can call

+** 'lua_setfield'.

+*/

+static void treatstackoption (lua_State *L, lua_State *L1, const char *fname) {

+  if (L == L1)

+    lua_rotate(L, -2, 1);  /* exchange object and table */

+  else

+    lua_xmove(L1, L, 1);  /* move object to the "main" stack */

+  lua_setfield(L, -2, fname);  /* put object into table */

+}

+

+

+/*

+** Calls 'lua_getinfo' and collects all results in a new table.

+** L1 needs stack space for an optional input (function) plus

+** two optional outputs (function and line table) from function

+** 'lua_getinfo'.

+*/

+static int db_getinfo (lua_State *L) {

+  lua_Debug ar;

+  int arg;

+  lua_State *L1 = getthread(L, &arg);

+  const char *options = luaL_optstring(L, arg+2, "flnSrtu");

+  checkstack(L, L1, 3);

+  if (lua_isfunction(L, arg + 1)) {  /* info about a function? */

+    options = lua_pushfstring(L, ">%s", options);  /* add '>' to 'options' */

+    lua_pushvalue(L, arg + 1);  /* move function to 'L1' stack */

+    lua_xmove(L, L1, 1);

+  }

+  else {  /* stack level */

+    if (!lua_getstack(L1, (int)luaL_checkinteger(L, arg + 1), &ar)) {

+      luaL_pushfail(L);  /* level out of range */

+      return 1;

+    }

+  }

+  if (!lua_getinfo(L1, options, &ar))

+    return luaL_argerror(L, arg+2, "invalid option");

+  lua_newtable(L);  /* table to collect results */

+  if (strchr(options, 'S')) {

+    lua_pushlstring(L, ar.source, ar.srclen);

+    lua_setfield(L, -2, "source");

+    settabss(L, "short_src", ar.short_src);

+    settabsi(L, "linedefined", ar.linedefined);

+    settabsi(L, "lastlinedefined", ar.lastlinedefined);

+    settabss(L, "what", ar.what);

+  }

+  if (strchr(options, 'l'))

+    settabsi(L, "currentline", ar.currentline);

+  if (strchr(options, 'u')) {

+    settabsi(L, "nups", ar.nups);

+    settabsi(L, "nparams", ar.nparams);

+    settabsb(L, "isvararg", ar.isvararg);

+  }

+  if (strchr(options, 'n')) {

+    settabss(L, "name", ar.name);

+    settabss(L, "namewhat", ar.namewhat);

+  }

+  if (strchr(options, 'r')) {

+    settabsi(L, "ftransfer", ar.ftransfer);

+    settabsi(L, "ntransfer", ar.ntransfer);

+  }

+  if (strchr(options, 't'))

+    settabsb(L, "istailcall", ar.istailcall);

+  if (strchr(options, 'L'))

+    treatstackoption(L, L1, "activelines");

+  if (strchr(options, 'f'))

+    treatstackoption(L, L1, "func");

+  return 1;  /* return table */

+}

+

+

+static int db_getlocal (lua_State *L) {

+  int arg;

+  lua_State *L1 = getthread(L, &arg);

+  int nvar = (int)luaL_checkinteger(L, arg + 2);  /* local-variable index */

+  if (lua_isfunction(L, arg + 1)) {  /* function argument? */

+    lua_pushvalue(L, arg + 1);  /* push function */

+    lua_pushstring(L, lua_getlocal(L, NULL, nvar));  /* push local name */

+    return 1;  /* return only name (there is no value) */

+  }

+  else {  /* stack-level argument */

+    lua_Debug ar;

+    const char *name;

+    int level = (int)luaL_checkinteger(L, arg + 1);

+    if (!lua_getstack(L1, level, &ar))  /* out of range? */

+      return luaL_argerror(L, arg+1, "level out of range");

+    checkstack(L, L1, 1);

+    name = lua_getlocal(L1, &ar, nvar);

+    if (name) {

+      lua_xmove(L1, L, 1);  /* move local value */

+      lua_pushstring(L, name);  /* push name */

+      lua_rotate(L, -2, 1);  /* re-order */

+      return 2;

+    }

+    else {

+      luaL_pushfail(L);  /* no name (nor value) */

+      return 1;

+    }

+  }

+}

+

+

+static int db_setlocal (lua_State *L) {

+  int arg;

+  const char *name;

+  lua_State *L1 = getthread(L, &arg);

+  lua_Debug ar;

+  int level = (int)luaL_checkinteger(L, arg + 1);

+  int nvar = (int)luaL_checkinteger(L, arg + 2);

+  if (!lua_getstack(L1, level, &ar))  /* out of range? */

+    return luaL_argerror(L, arg+1, "level out of range");

+  luaL_checkany(L, arg+3);

+  lua_settop(L, arg+3);

+  checkstack(L, L1, 1);

+  lua_xmove(L, L1, 1);

+  name = lua_setlocal(L1, &ar, nvar);

+  if (name == NULL)

+    lua_pop(L1, 1);  /* pop value (if not popped by 'lua_setlocal') */

+  lua_pushstring(L, name);

+  return 1;

+}

+

+

+/*

+** get (if 'get' is true) or set an upvalue from a closure

+*/

+static int auxupvalue (lua_State *L, int get) {

+  const char *name;

+  int n = (int)luaL_checkinteger(L, 2);  /* upvalue index */

+  luaL_checktype(L, 1, LUA_TFUNCTION);  /* closure */

+  name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n);

+  if (name == NULL) return 0;

+  lua_pushstring(L, name);

+  lua_insert(L, -(get+1));  /* no-op if get is false */

+  return get + 1;

+}

+

+

+static int db_getupvalue (lua_State *L) {

+  return auxupvalue(L, 1);

+}

+

+

+static int db_setupvalue (lua_State *L) {

+  luaL_checkany(L, 3);

+  return auxupvalue(L, 0);

+}

+

+

+/*

+** Check whether a given upvalue from a given closure exists and

+** returns its index

+*/

+static void *checkupval (lua_State *L, int argf, int argnup, int *pnup) {

+  void *id;

+  int nup = (int)luaL_checkinteger(L, argnup);  /* upvalue index */

+  luaL_checktype(L, argf, LUA_TFUNCTION);  /* closure */

+  id = lua_upvalueid(L, argf, nup);

+  if (pnup) {

+    luaL_argcheck(L, id != NULL, argnup, "invalid upvalue index");

+    *pnup = nup;

+  }

+  return id;

+}

+

+

+static int db_upvalueid (lua_State *L) {

+  void *id = checkupval(L, 1, 2, NULL);

+  if (id != NULL)

+    lua_pushlightuserdata(L, id);

+  else

+    luaL_pushfail(L);

+  return 1;

+}

+

+

+static int db_upvaluejoin (lua_State *L) {

+  int n1, n2;

+  checkupval(L, 1, 2, &n1);

+  checkupval(L, 3, 4, &n2);

+  luaL_argcheck(L, !lua_iscfunction(L, 1), 1, "Lua function expected");

+  luaL_argcheck(L, !lua_iscfunction(L, 3), 3, "Lua function expected");

+  lua_upvaluejoin(L, 1, n1, 3, n2);

+  return 0;

+}

+

+

+/*

+** Call hook function registered at hook table for the current

+** thread (if there is one)

+*/

+static void hookf (lua_State *L, lua_Debug *ar) {

+  static const char *const hooknames[] =

+    {"call", "return", "line", "count", "tail call"};

+  lua_getfield(L, LUA_REGISTRYINDEX, HOOKKEY);

+  lua_pushthread(L);

+  if (lua_rawget(L, -2) == LUA_TFUNCTION) {  /* is there a hook function? */

+    lua_pushstring(L, hooknames[(int)ar->event]);  /* push event name */

+    if (ar->currentline >= 0)

+      lua_pushinteger(L, ar->currentline);  /* push current line */

+    else lua_pushnil(L);

+    lua_assert(lua_getinfo(L, "lS", ar));

+    lua_call(L, 2, 0);  /* call hook function */

+  }

+}

+

+

+/*

+** Convert a string mask (for 'sethook') into a bit mask

+*/

+static int makemask (const char *smask, int count) {

+  int mask = 0;

+  if (strchr(smask, 'c')) mask |= LUA_MASKCALL;

+  if (strchr(smask, 'r')) mask |= LUA_MASKRET;

+  if (strchr(smask, 'l')) mask |= LUA_MASKLINE;

+  if (count > 0) mask |= LUA_MASKCOUNT;

+  return mask;

+}

+

+

+/*

+** Convert a bit mask (for 'gethook') into a string mask

+*/

+static char *unmakemask (int mask, char *smask) {

+  int i = 0;

+  if (mask & LUA_MASKCALL) smask[i++] = 'c';

+  if (mask & LUA_MASKRET) smask[i++] = 'r';

+  if (mask & LUA_MASKLINE) smask[i++] = 'l';

+  smask[i] = '\0';

+  return smask;

+}

+

+

+static int db_sethook (lua_State *L) {

+  int arg, mask, count;

+  lua_Hook func;

+  lua_State *L1 = getthread(L, &arg);

+  if (lua_isnoneornil(L, arg+1)) {  /* no hook? */

+    lua_settop(L, arg+1);

+    func = NULL; mask = 0; count = 0;  /* turn off hooks */

+  }

+  else {

+    const char *smask = luaL_checkstring(L, arg+2);

+    luaL_checktype(L, arg+1, LUA_TFUNCTION);

+    count = (int)luaL_optinteger(L, arg + 3, 0);

+    func = hookf; mask = makemask(smask, count);

+  }

+  if (!luaL_getsubtable(L, LUA_REGISTRYINDEX, HOOKKEY)) {

+    /* table just created; initialize it */

+    lua_pushstring(L, "k");

+    lua_setfield(L, -2, "__mode");  /** hooktable.__mode = "k" */

+    lua_pushvalue(L, -1);

+    lua_setmetatable(L, -2);  /* metatable(hooktable) = hooktable */

+  }

+  checkstack(L, L1, 1);

+  lua_pushthread(L1); lua_xmove(L1, L, 1);  /* key (thread) */

+  lua_pushvalue(L, arg + 1);  /* value (hook function) */

+  lua_rawset(L, -3);  /* hooktable[L1] = new Lua hook */

+  lua_sethook(L1, func, mask, count);

+  return 0;

+}

+

+

+static int db_gethook (lua_State *L) {

+  int arg;

+  lua_State *L1 = getthread(L, &arg);

+  char buff[5];

+  int mask = lua_gethookmask(L1);

+  lua_Hook hook = lua_gethook(L1);

+  if (hook == NULL) {  /* no hook? */

+    luaL_pushfail(L);

+    return 1;

+  }

+  else if (hook != hookf)  /* external hook? */

+    lua_pushliteral(L, "external hook");

+  else {  /* hook table must exist */

+    lua_getfield(L, LUA_REGISTRYINDEX, HOOKKEY);

+    checkstack(L, L1, 1);

+    lua_pushthread(L1); lua_xmove(L1, L, 1);

+    lua_rawget(L, -2);   /* 1st result = hooktable[L1] */

+    lua_remove(L, -2);  /* remove hook table */

+  }

+  lua_pushstring(L, unmakemask(mask, buff));  /* 2nd result = mask */

+  lua_pushinteger(L, lua_gethookcount(L1));  /* 3rd result = count */

+  return 3;

+}

+

+

+static int db_debug (lua_State *L) {

+  for (;;) {

+    char buffer[250];

+    lua_writestringerror("%s", "lua_debug> ");

+    if (fgets(buffer, sizeof(buffer), stdin) == 0 ||

+        strcmp(buffer, "cont\n") == 0)

+      return 0;

+    if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") ||

+        lua_pcall(L, 0, 0, 0))

+      lua_writestringerror("%s\n", luaL_tolstring(L, -1, NULL));

+    lua_settop(L, 0);  /* remove eventual returns */

+  }

+}

+

+

+static int db_traceback (lua_State *L) {

+  int arg;

+  lua_State *L1 = getthread(L, &arg);

+  const char *msg = lua_tostring(L, arg + 1);

+  if (msg == NULL && !lua_isnoneornil(L, arg + 1))  /* non-string 'msg'? */

+    lua_pushvalue(L, arg + 1);  /* return it untouched */

+  else {

+    int level = (int)luaL_optinteger(L, arg + 2, (L == L1) ? 1 : 0);

+    luaL_traceback(L, L1, msg, level);

+  }

+  return 1;

+}

+

+

+static int db_setcstacklimit (lua_State *L) {

+  int limit = (int)luaL_checkinteger(L, 1);

+  int res = lua_setcstacklimit(L, limit);

+  lua_pushinteger(L, res);

+  return 1;

+}

+

+

+static const luaL_Reg dblib[] = {

+  {"debug", db_debug},

+  {"getuservalue", db_getuservalue},

+  {"gethook", db_gethook},

+  {"getinfo", db_getinfo},

+  {"getlocal", db_getlocal},

+  {"getregistry", db_getregistry},

+  {"getmetatable", db_getmetatable},

+  {"getupvalue", db_getupvalue},

+  {"upvaluejoin", db_upvaluejoin},

+  {"upvalueid", db_upvalueid},

+  {"setuservalue", db_setuservalue},

+  {"sethook", db_sethook},

+  {"setlocal", db_setlocal},

+  {"setmetatable", db_setmetatable},

+  {"setupvalue", db_setupvalue},

+  {"traceback", db_traceback},

+  {"setcstacklimit", db_setcstacklimit},

+  {NULL, NULL}

+};

+

+

+LUAMOD_API int luaopen_debug (lua_State *L) {

+  luaL_newlib(L, dblib);

+  return 1;

+}

+

--- /dev/null

+++ b/ldebug.c

@@ -1,0 +1,852 @@

+/*

+** $Id: ldebug.c $

+** Debug Interface

+** See Copyright Notice in lua.h

+*/

+

+#define ldebug_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <stdarg.h>

+#include <stddef.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "lapi.h"

+#include "lcode.h"

+#include "ldebug.h"

+#include "ldo.h"

+#include "lfunc.h"

+#include "lobject.h"

+#include "lopcodes.h"

+#include "lstate.h"

+#include "lstring.h"

+#include "ltable.h"

+#include "ltm.h"

+#include "lvm.h"

+

+

+

+#define noLuaClosure(f)		((f) == NULL || (f)->c.tt == LUA_VCCL)

+

+/* inverse of 'pcRel' */

+#define invpcRel(pc, p)		((p)->code + (pc) + 1)

+

+static const char *funcnamefromcode (lua_State *L, CallInfo *ci,

+                                    const char **name);

+

+

+static int currentpc (CallInfo *ci) {

+  lua_assert(isLua(ci));

+  return pcRel(ci->u.l.savedpc, ci_func(ci)->p);

+}

+

+

+/*

+** Get a "base line" to find the line corresponding to an instruction.

+** For that, search the array of absolute line info for the largest saved

+** instruction smaller or equal to the wanted instruction. A special

+** case is when there is no absolute info or the instruction is before

+** the first absolute one.

+*/

+static int getbaseline (const Proto *f, int pc, int *basepc) {

+  if (f->sizeabslineinfo == 0 || pc < f->abslineinfo[0].pc) {

+    *basepc = -1;  /* start from the beginning */

+    return f->linedefined;

+  }

+  else {

+    unsigned int i;

+    if (pc >= f->abslineinfo[f->sizeabslineinfo - 1].pc)

+      i = f->sizeabslineinfo - 1;  /* instruction is after last saved one */

+    else {  /* binary search */

+      unsigned int j = f->sizeabslineinfo - 1;  /* pc < anchorlines[j] */

+      i = 0;  /* abslineinfo[i] <= pc */

+      while (i < j - 1) {

+        unsigned int m = (j + i) / 2;

+        if (pc >= f->abslineinfo[m].pc)

+          i = m;

+        else

+          j = m;

+      }

+    }

+    *basepc = f->abslineinfo[i].pc;

+    return f->abslineinfo[i].line;

+  }

+}

+

+

+/*

+** Get the line corresponding to instruction 'pc' in function 'f';

+** first gets a base line and from there does the increments until

+** the desired instruction.

+*/

+int luaG_getfuncline (const Proto *f, int pc) {

+  if (f->lineinfo == NULL)  /* no debug information? */

+    return -1;

+  else {

+    int basepc;

+    int baseline = getbaseline(f, pc, &basepc);

+    while (basepc++ < pc) {  /* walk until given instruction */

+      lua_assert(f->lineinfo[basepc] != ABSLINEINFO);

+      baseline += f->lineinfo[basepc];  /* correct line */

+    }

+    return baseline;

+  }

+}

+

+

+static int getcurrentline (CallInfo *ci) {

+  return luaG_getfuncline(ci_func(ci)->p, currentpc(ci));

+}

+

+

+/*

+** Set 'trap' for all active Lua frames.

+** This function can be called during a signal, under "reasonable"

+** assumptions. A new 'ci' is completely linked in the list before it

+** becomes part of the "active" list, and we assume that pointers are

+** atomic; see comment in next function.

+** (A compiler doing interprocedural optimizations could, theoretically,

+** reorder memory writes in such a way that the list could be

+** temporarily broken while inserting a new element. We simply assume it

+** has no good reasons to do that.)

+*/

+static void settraps (CallInfo *ci) {

+  for (; ci != NULL; ci = ci->previous)

+    if (isLua(ci))

+      ci->u.l.trap = 1;

+}

+

+

+/*

+** This function can be called during a signal, under "reasonable"

+** assumptions.

+** Fields 'basehookcount' and 'hookcount' (set by 'resethookcount')

+** are for debug only, and it is no problem if they get arbitrary

+** values (causes at most one wrong hook call). 'hookmask' is an atomic

+** value. We assume that pointers are atomic too (e.g., gcc ensures that

+** for all platforms where it runs). Moreover, 'hook' is always checked

+** before being called (see 'luaD_hook').

+*/

+LUA_API void lua_sethook (lua_State *L, lua_Hook func, int mask, int count) {

+  if (func == NULL || mask == 0) {  /* turn off hooks? */

+    mask = 0;

+    func = NULL;

+  }

+  L->hook = func;

+  L->basehookcount = count;

+  resethookcount(L);

+  L->hookmask = cast_byte(mask);

+  if (mask)

+    settraps(L->ci);  /* to trace inside 'luaV_execute' */

+}

+

+

+LUA_API lua_Hook lua_gethook (lua_State *L) {

+  return L->hook;

+}

+

+

+LUA_API int lua_gethookmask (lua_State *L) {

+  return L->hookmask;

+}

+

+

+LUA_API int lua_gethookcount (lua_State *L) {

+  return L->basehookcount;

+}

+

+

+LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {

+  int status;

+  CallInfo *ci;

+  if (level < 0) return 0;  /* invalid (negative) level */

+  lua_lock(L);

+  for (ci = L->ci; level > 0 && ci != &L->base_ci; ci = ci->previous)

+    level--;

+  if (level == 0 && ci != &L->base_ci) {  /* level found? */

+    status = 1;

+    ar->i_ci = ci;

+  }

+  else status = 0;  /* no such level */

+  lua_unlock(L);

+  return status;

+}

+

+

+static const char *upvalname (const Proto *p, int uv) {

+  TString *s = check_exp(uv < p->sizeupvalues, p->upvalues[uv].name);

+  if (s == NULL) return "?";

+  else return getstr(s);

+}

+

+

+static const char *findvararg (CallInfo *ci, int n, StkId *pos) {

+  if (clLvalue(s2v(ci->func))->p->is_vararg) {

+    int nextra = ci->u.l.nextraargs;

+    if (n >= -nextra) {  /* 'n' is negative */

+      *pos = ci->func - nextra - (n + 1);

+      return "(vararg)";  /* generic name for any vararg */

+    }

+  }

+  return NULL;  /* no such vararg */

+}

+

+

+const char *luaG_findlocal (lua_State *L, CallInfo *ci, int n, StkId *pos) {

+  StkId base = ci->func + 1;

+  const char *name = NULL;

+  if (isLua(ci)) {

+    if (n < 0)  /* access to vararg values? */

+      return findvararg(ci, n, pos);

+    else

+      name = luaF_getlocalname(ci_func(ci)->p, n, currentpc(ci));

+  }

+  if (name == NULL) {  /* no 'standard' name? */

+    StkId limit = (ci == L->ci) ? L->top : ci->next->func;

+    if (limit - base >= n && n > 0) {  /* is 'n' inside 'ci' stack? */

+      /* generic name for any valid slot */

+      name = isLua(ci) ? "(temporary)" : "(C temporary)";

+    }

+    else

+      return NULL;  /* no name */

+  }

+  if (pos)

+    *pos = base + (n - 1);

+  return name;

+}

+

+

+LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {

+  const char *name;

+  lua_lock(L);

+  if (ar == NULL) {  /* information about non-active function? */

+    if (!isLfunction(s2v(L->top - 1)))  /* not a Lua function? */

+      name = NULL;

+    else  /* consider live variables at function start (parameters) */

+      name = luaF_getlocalname(clLvalue(s2v(L->top - 1))->p, n, 0);

+  }

+  else {  /* active function; get information through 'ar' */

+    StkId pos = NULL;  /* to avoid warnings */

+    name = luaG_findlocal(L, ar->i_ci, n, &pos);

+    if (name) {

+      setobjs2s(L, L->top, pos);

+      api_incr_top(L);

+    }

+  }

+  lua_unlock(L);

+  return name;

+}

+

+

+LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {

+  StkId pos = NULL;  /* to avoid warnings */

+  const char *name;

+  lua_lock(L);

+  name = luaG_findlocal(L, ar->i_ci, n, &pos);

+  if (name) {

+    setobjs2s(L, pos, L->top - 1);

+    L->top--;  /* pop value */

+  }

+  lua_unlock(L);

+  return name;

+}

+

+

+static void funcinfo (lua_Debug *ar, Closure *cl) {

+  if (noLuaClosure(cl)) {

+    ar->source = "=[C]";

+    ar->srclen = LL("=[C]");

+    ar->linedefined = -1;

+    ar->lastlinedefined = -1;

+    ar->what = "C";

+  }

+  else {

+    const Proto *p = cl->l.p;

+    if (p->source) {

+      ar->source = getstr(p->source);

+      ar->srclen = tsslen(p->source);

+    }

+    else {

+      ar->source = "=?";

+      ar->srclen = LL("=?");

+    }

+    ar->linedefined = p->linedefined;

+    ar->lastlinedefined = p->lastlinedefined;

+    ar->what = (ar->linedefined == 0) ? "main" : "Lua";

+  }

+  luaO_chunkid(ar->short_src, ar->source, ar->srclen);

+}

+

+

+static int nextline (const Proto *p, int currentline, int pc) {

+  if (p->lineinfo[pc] != ABSLINEINFO)

+    return currentline + p->lineinfo[pc];

+  else

+    return luaG_getfuncline(p, pc);

+}

+

+

+static void collectvalidlines (lua_State *L, Closure *f) {

+  if (noLuaClosure(f)) {

+    setnilvalue(s2v(L->top));

+    api_incr_top(L);

+  }

+  else {

+    int i;

+    TValue v;

+    const Proto *p = f->l.p;

+    int currentline = p->linedefined;

+    Table *t = luaH_new(L);  /* new table to store active lines */

+    sethvalue2s(L, L->top, t);  /* push it on stack */

+    api_incr_top(L);

+    setbtvalue(&v);  /* boolean 'true' to be the value of all indices */

+    for (i = 0; i < p->sizelineinfo; i++) {  /* for all lines with code */

+      currentline = nextline(p, currentline, i);

+      luaH_setint(L, t, currentline, &v);  /* table[line] = true */

+    }

+  }

+}

+

+

+static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) {

+  if (ci == NULL)  /* no 'ci'? */

+    return NULL;  /* no info */

+  else if (ci->callstatus & CIST_FIN) {  /* is this a finalizer? */

+    *name = "__gc";

+    return "metamethod";  /* report it as such */

+  }

+  /* calling function is a known Lua function? */

+  else if (!(ci->callstatus & CIST_TAIL) && isLua(ci->previous))

+    return funcnamefromcode(L, ci->previous, name);

+  else return NULL;  /* no way to find a name */

+}

+

+

+static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,

+                       Closure *f, CallInfo *ci) {

+  int status = 1;

+  for (; *what; what++) {

+    switch (*what) {

+      case 'S': {

+        funcinfo(ar, f);

+        break;

+      }

+      case 'l': {

+        ar->currentline = (ci && isLua(ci)) ? getcurrentline(ci) : -1;

+        break;

+      }

+      case 'u': {

+        ar->nups = (f == NULL) ? 0 : f->c.nupvalues;

+        if (noLuaClosure(f)) {

+          ar->isvararg = 1;

+          ar->nparams = 0;

+        }

+        else {

+          ar->isvararg = f->l.p->is_vararg;

+          ar->nparams = f->l.p->numparams;

+        }

+        break;

+      }

+      case 't': {

+        ar->istailcall = (ci) ? ci->callstatus & CIST_TAIL : 0;

+        break;

+      }

+      case 'n': {

+        ar->namewhat = getfuncname(L, ci, &ar->name);

+        if (ar->namewhat == NULL) {

+          ar->namewhat = "";  /* not found */

+          ar->name = NULL;

+        }

+        break;

+      }

+      case 'r': {

+        if (ci == NULL || !(ci->callstatus & CIST_TRAN))

+          ar->ftransfer = ar->ntransfer = 0;

+        else {

+          ar->ftransfer = ci->u2.transferinfo.ftransfer;

+          ar->ntransfer = ci->u2.transferinfo.ntransfer;

+        }

+        break;

+      }

+      case 'L':

+      case 'f':  /* handled by lua_getinfo */

+        break;

+      default: status = 0;  /* invalid option */

+    }

+  }

+  return status;

+}

+

+

+LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {

+  int status;

+  Closure *cl;

+  CallInfo *ci;

+  TValue *func;

+  lua_lock(L);

+  if (*what == '>') {

+    ci = NULL;

+    func = s2v(L->top - 1);

+    api_check(L, ttisfunction(func), "function expected");

+    what++;  /* skip the '>' */

+    L->top--;  /* pop function */

+  }

+  else {

+    ci = ar->i_ci;

+    func = s2v(ci->func);

+    lua_assert(ttisfunction(func));

+  }

+  cl = ttisclosure(func) ? clvalue(func) : NULL;

+  status = auxgetinfo(L, what, ar, cl, ci);

+  if (strchr(what, 'f')) {

+    setobj2s(L, L->top, func);

+    api_incr_top(L);

+  }

+  if (strchr(what, 'L'))

+    collectvalidlines(L, cl);

+  lua_unlock(L);

+  return status;

+}

+

+

+/*

+** {======================================================

+** Symbolic Execution

+** =======================================================

+*/

+

+static const char *getobjname (const Proto *p, int lastpc, int reg,

+                               const char **name);

+

+

+/*

+** Find a "name" for the constant 'c'.

+*/

+static void kname (const Proto *p, int c, const char **name) {

+  TValue *kvalue = &p->k[c];

+  *name = (ttisstring(kvalue)) ? svalue(kvalue) : "?";

+}

+

+

+/*

+** Find a "name" for the register 'c'.

+*/

+static void rname (const Proto *p, int pc, int c, const char **name) {

+  const char *what = getobjname(p, pc, c, name); /* search for 'c' */

+  if (!(what && *what == 'c'))  /* did not find a constant name? */

+    *name = "?";

+}

+

+

+/*

+** Find a "name" for a 'C' value in an RK instruction.

+*/

+static void rkname (const Proto *p, int pc, Instruction i, const char **name) {

+  int c = GETARG_C(i);  /* key index */

+  if (GETARG_k(i))  /* is 'c' a constant? */

+    kname(p, c, name);

+  else  /* 'c' is a register */

+    rname(p, pc, c, name);

+}

+

+

+static int filterpc (int pc, int jmptarget) {

+  if (pc < jmptarget)  /* is code conditional (inside a jump)? */

+    return -1;  /* cannot know who sets that register */

+  else return pc;  /* current position sets that register */

+}

+

+

+/*

+** Try to find last instruction before 'lastpc' that modified register 'reg'.

+*/

+static int findsetreg (const Proto *p, int lastpc, int reg) {

+  int pc;

+  int setreg = -1;  /* keep last instruction that changed 'reg' */

+  int jmptarget = 0;  /* any code before this address is conditional */

+  if (testMMMode(GET_OPCODE(p->code[lastpc])))

+    lastpc--;  /* previous instruction was not actually executed */

+  for (pc = 0; pc < lastpc; pc++) {

+    Instruction i = p->code[pc];

+    OpCode op = GET_OPCODE(i);

+    int a = GETARG_A(i);

+    int change;  /* true if current instruction changed 'reg' */

+    switch (op) {

+      case OP_LOADNIL: {  /* set registers from 'a' to 'a+b' */

+        int b = GETARG_B(i);

+        change = (a <= reg && reg <= a + b);

+        break;

+      }

+      case OP_TFORCALL: {  /* affect all regs above its base */

+        change = (reg >= a + 2);

+        break;

+      }

+      case OP_CALL:

+      case OP_TAILCALL: {  /* affect all registers above base */

+        change = (reg >= a);

+        break;

+      }

+      case OP_JMP: {  /* doesn't change registers, but changes 'jmptarget' */

+        int b = GETARG_sJ(i);

+        int dest = pc + 1 + b;

+        /* jump does not skip 'lastpc' and is larger than current one? */

+        if (dest <= lastpc && dest > jmptarget)

+          jmptarget = dest;  /* update 'jmptarget' */

+        change = 0;

+        break;

+      }

+      default:  /* any instruction that sets A */

+        change = (testAMode(op) && reg == a);

+        break;

+    }

+    if (change)

+      setreg = filterpc(pc, jmptarget);

+  }

+  return setreg;

+}

+

+

+/*

+** Check whether table being indexed by instruction 'i' is the

+** environment '_ENV'

+*/

+static const char *gxf (const Proto *p, int pc, Instruction i, int isup) {

+  int t = GETARG_B(i);  /* table index */

+  const char *name;  /* name of indexed variable */

+  if (isup)  /* is an upvalue? */

+    name = upvalname(p, t);

+  else

+    getobjname(p, pc, t, &name);

+  return (name && strcmp(name, LUA_ENV) == 0) ? "global" : "field";

+}

+

+

+static const char *getobjname (const Proto *p, int lastpc, int reg,

+                               const char **name) {

+  int pc;

+  *name = luaF_getlocalname(p, reg + 1, lastpc);

+  if (*name)  /* is a local? */

+    return "local";

+  /* else try symbolic execution */

+  pc = findsetreg(p, lastpc, reg);

+  if (pc != -1) {  /* could find instruction? */

+    Instruction i = p->code[pc];

+    OpCode op = GET_OPCODE(i);

+    switch (op) {

+      case OP_MOVE: {

+        int b = GETARG_B(i);  /* move from 'b' to 'a' */

+        if (b < GETARG_A(i))

+          return getobjname(p, pc, b, name);  /* get name for 'b' */

+        break;

+      }

+      case OP_GETTABUP: {

+        int k = GETARG_C(i);  /* key index */

+        kname(p, k, name);

+        return gxf(p, pc, i, 1);

+      }

+      case OP_GETTABLE: {

+        int k = GETARG_C(i);  /* key index */

+        rname(p, pc, k, name);

+        return gxf(p, pc, i, 0);

+      }

+      case OP_GETI: {

+        *name = "integer index";

+        return "field";

+      }

+      case OP_GETFIELD: {

+        int k = GETARG_C(i);  /* key index */

+        kname(p, k, name);

+        return gxf(p, pc, i, 0);

+      }

+      case OP_GETUPVAL: {

+        *name = upvalname(p, GETARG_B(i));

+        return "upvalue";

+      }

+      case OP_LOADK:

+      case OP_LOADKX: {

+        int b = (op == OP_LOADK) ? GETARG_Bx(i)

+                                 : GETARG_Ax(p->code[pc + 1]);

+        if (ttisstring(&p->k[b])) {

+          *name = svalue(&p->k[b]);

+          return "constant";

+        }

+        break;

+      }

+      case OP_SELF: {

+        rkname(p, pc, i, name);

+        return "method";

+      }

+      default: break;  /* go through to return NULL */

+    }

+  }

+  return NULL;  /* could not find reasonable name */

+}

+

+

+/*

+** Try to find a name for a function based on the code that called it.

+** (Only works when function was called by a Lua function.)

+** Returns what the name is (e.g., "for iterator", "method",

+** "metamethod") and sets '*name' to point to the name.

+*/

+static const char *funcnamefromcode (lua_State *L, CallInfo *ci,

+                                     const char **name) {

+  TMS tm = (TMS)0;  /* (initial value avoids warnings) */

+  const Proto *p = ci_func(ci)->p;  /* calling function */

+  int pc = currentpc(ci);  /* calling instruction index */

+  Instruction i = p->code[pc];  /* calling instruction */

+  if (ci->callstatus & CIST_HOOKED) {  /* was it called inside a hook? */

+    *name = "?";

+    return "hook";

+  }

+  switch (GET_OPCODE(i)) {

+    case OP_CALL:

+    case OP_TAILCALL:

+      return getobjname(p, pc, GETARG_A(i), name);  /* get function name */

+    case OP_TFORCALL: {  /* for iterator */

+      *name = "for iterator";

+       return "for iterator";

+    }

+    /* other instructions can do calls through metamethods */

+    case OP_SELF: case OP_GETTABUP: case OP_GETTABLE:

+    case OP_GETI: case OP_GETFIELD:

+      tm = TM_INDEX;

+      break;

+    case OP_SETTABUP: case OP_SETTABLE: case OP_SETI: case OP_SETFIELD:

+      tm = TM_NEWINDEX;

+      break;

+    case OP_MMBIN: case OP_MMBINI: case OP_MMBINK: {

+      tm = cast(TMS, GETARG_C(i));

+      break;

+    }

+    case OP_UNM: tm = TM_UNM; break;

+    case OP_BNOT: tm = TM_BNOT; break;

+    case OP_LEN: tm = TM_LEN; break;

+    case OP_CONCAT: tm = TM_CONCAT; break;

+    case OP_EQ: tm = TM_EQ; break;

+    case OP_LT: case OP_LE: case OP_LTI: case OP_LEI:

+      *name = "order";  /* '<=' can call '__lt', etc. */

+      return "metamethod";

+    case OP_CLOSE: case OP_RETURN:

+      *name = "close";

+      return "metamethod";

+    default:

+      return NULL;  /* cannot find a reasonable name */

+  }

+  *name = getstr(G(L)->tmname[tm]) + 2;

+  return "metamethod";

+}

+

+/* }====================================================== */

+

+

+

+/*

+** The subtraction of two potentially unrelated pointers is

+** not ISO C, but it should not crash a program; the subsequent

+** checks are ISO C and ensure a correct result.

+*/

+static int isinstack (CallInfo *ci, const TValue *o) {

+  StkId base = ci->func + 1;

+  ptrdiff_t i = cast(StkId, o) - base;

+  return (0 <= i && i < (ci->top - base) && s2v(base + i) == o);

+}

+

+

+/*

+** Checks whether value 'o' came from an upvalue. (That can only happen

+** with instructions OP_GETTABUP/OP_SETTABUP, which operate directly on

+** upvalues.)

+*/

+static const char *getupvalname (CallInfo *ci, const TValue *o,

+                                 const char **name) {

+  LClosure *c = ci_func(ci);

+  int i;

+  for (i = 0; i < c->nupvalues; i++) {

+    if (c->upvals[i]->v == o) {

+      *name = upvalname(c->p, i);

+      return "upvalue";

+    }

+  }

+  return NULL;

+}

+

+

+static const char *varinfo (lua_State *L, const TValue *o) {

+  const char *name = NULL;  /* to avoid warnings */

+  CallInfo *ci = L->ci;

+  const char *kind = NULL;

+  if (isLua(ci)) {

+    kind = getupvalname(ci, o, &name);  /* check whether 'o' is an upvalue */

+    if (!kind && isinstack(ci, o))  /* no? try a register */

+      kind = getobjname(ci_func(ci)->p, currentpc(ci),

+                        cast_int(cast(StkId, o) - (ci->func + 1)), &name);

+  }

+  return (kind) ? luaO_pushfstring(L, " (%s '%s')", kind, name) : "";

+}

+

+

+l_noret luaG_typeerror (lua_State *L, const TValue *o, const char *op) {

+  const char *t = luaT_objtypename(L, o);

+  luaG_runerror(L, "attempt to %s a %s value%s", op, t, varinfo(L, o));

+}

+

+

+l_noret luaG_forerror (lua_State *L, const TValue *o, const char *what) {

+  luaG_runerror(L, "bad 'for' %s (number expected, got %s)",

+                   what, luaT_objtypename(L, o));

+}

+

+

+l_noret luaG_concaterror (lua_State *L, const TValue *p1, const TValue *p2) {

+  if (ttisstring(p1) || cvt2str(p1)) p1 = p2;

+  luaG_typeerror(L, p1, "concatenate");

+}

+

+

+l_noret luaG_opinterror (lua_State *L, const TValue *p1,

+                         const TValue *p2, const char *msg) {

+  if (!ttisnumber(p1))  /* first operand is wrong? */

+    p2 = p1;  /* now second is wrong */

+  luaG_typeerror(L, p2, msg);

+}

+

+

+/*

+** Error when both values are convertible to numbers, but not to integers

+*/

+l_noret luaG_tointerror (lua_State *L, const TValue *p1, const TValue *p2) {

+  lua_Integer temp;

+  if (!tointegerns(p1, &temp))

+    p2 = p1;

+  luaG_runerror(L, "number%s has no integer representation", varinfo(L, p2));

+}

+

+

+l_noret luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) {

+  const char *t1 = luaT_objtypename(L, p1);

+  const char *t2 = luaT_objtypename(L, p2);

+  if (strcmp(t1, t2) == 0)

+    luaG_runerror(L, "attempt to compare two %s values", t1);

+  else

+    luaG_runerror(L, "attempt to compare %s with %s", t1, t2);

+}

+

+

+/* add src:line information to 'msg' */

+const char *luaG_addinfo (lua_State *L, const char *msg, TString *src,

+                                        int line) {

+  char buff[LUA_IDSIZE];

+  if (src)

+    luaO_chunkid(buff, getstr(src), tsslen(src));

+  else {  /* no source available; use "?" instead */

+    buff[0] = '?'; buff[1] = '\0';

+  }

+  return luaO_pushfstring(L, "%s:%d: %s", buff, line, msg);

+}

+

+

+l_noret luaG_errormsg (lua_State *L) {

+  if (L->errfunc != 0) {  /* is there an error handling function? */

+    StkId errfunc = restorestack(L, L->errfunc);

+    lua_assert(ttisfunction(s2v(errfunc)));

+    setobjs2s(L, L->top, L->top - 1);  /* move argument */

+    setobjs2s(L, L->top - 1, errfunc);  /* push function */

+    L->top++;  /* assume EXTRA_STACK */

+    luaD_callnoyield(L, L->top - 2, 1);  /* call it */

+  }

+  luaD_throw(L, LUA_ERRRUN);

+}

+

+

+l_noret luaG_runerror (lua_State *L, const char *fmt, ...) {

+  CallInfo *ci = L->ci;

+  const char *msg;

+  va_list argp;

+  luaC_checkGC(L);  /* error message uses memory */

+  va_start(argp, fmt);

+  msg = luaO_pushvfstring(L, fmt, argp);  /* format message */

+  va_end(argp);

+  if (isLua(ci))  /* if Lua function, add source:line information */

+    luaG_addinfo(L, msg, ci_func(ci)->p->source, getcurrentline(ci));

+  luaG_errormsg(L);

+}

+

+

+/*

+** Check whether new instruction 'newpc' is in a different line from

+** previous instruction 'oldpc'.

+*/

+static int changedline (const Proto *p, int oldpc, int newpc) {

+  if (p->lineinfo == NULL)  /* no debug information? */

+    return 0;

+  while (oldpc++ < newpc) {

+    if (p->lineinfo[oldpc] != 0)

+      return (luaG_getfuncline(p, oldpc - 1) != luaG_getfuncline(p, newpc));

+  }

+  return 0;  /* no line changes between positions */

+}

+

+

+/*

+** Traces the execution of a Lua function. Called before the execution

+** of each opcode, when debug is on. 'L->oldpc' stores the last

+** instruction traced, to detect line changes. When entering a new

+** function, 'npci' will be zero and will test as a new line without

+** the need for 'oldpc'; so, 'oldpc' does not need to be initialized

+** before. Some exceptional conditions may return to a function without

+** updating 'oldpc'. In that case, 'oldpc' may be invalid; if so, it is

+** reset to zero.  (A wrong but valid 'oldpc' at most causes an extra

+** call to a line hook.)

+*/

+int luaG_traceexec (lua_State *L, const Instruction *pc) {

+  CallInfo *ci = L->ci;

+  lu_byte mask = L->hookmask;

+  const Proto *p = ci_func(ci)->p;

+  int counthook;

+  /* 'L->oldpc' may be invalid; reset it in this case */

+  int oldpc = (L->oldpc < p->sizecode) ? L->oldpc : 0;

+  if (!(mask & (LUA_MASKLINE | LUA_MASKCOUNT))) {  /* no hooks? */

+    ci->u.l.trap = 0;  /* don't need to stop again */

+    return 0;  /* turn off 'trap' */

+  }

+  pc++;  /* reference is always next instruction */

+  ci->u.l.savedpc = pc;  /* save 'pc' */

+  counthook = (--L->hookcount == 0 && (mask & LUA_MASKCOUNT));

+  if (counthook)

+    resethookcount(L);  /* reset count */

+  else if (!(mask & LUA_MASKLINE))

+    return 1;  /* no line hook and count != 0; nothing to be done now */

+  if (ci->callstatus & CIST_HOOKYIELD) {  /* called hook last time? */

+    ci->callstatus &= ~CIST_HOOKYIELD;  /* erase mark */

+    return 1;  /* do not call hook again (VM yielded, so it did not move) */

+  }

+  if (!isIT(*(ci->u.l.savedpc - 1)))

+    L->top = ci->top;  /* prepare top */

+  if (counthook)

+    luaD_hook(L, LUA_HOOKCOUNT, -1, 0, 0);  /* call count hook */

+  if (mask & LUA_MASKLINE) {

+    int npci = pcRel(pc, p);

+    if (npci == 0 ||  /* call linehook when enter a new function, */

+        pc <= invpcRel(oldpc, p) ||  /* when jump back (loop), or when */

+        changedline(p, oldpc, npci)) {  /* enter new line */

+      int newline = luaG_getfuncline(p, npci);

+      luaD_hook(L, LUA_HOOKLINE, newline, 0, 0);  /* call line hook */

+    }

+    L->oldpc = npci;  /* 'pc' of last call to line hook */

+  }

+  if (L->status == LUA_YIELD) {  /* did hook yield? */

+    if (counthook)

+      L->hookcount = 1;  /* undo decrement to zero */

+    ci->u.l.savedpc--;  /* undo increment (resume will increment it again) */

+    ci->callstatus |= CIST_HOOKYIELD;  /* mark that it yielded */

+    luaD_throw(L, LUA_YIELD);

+  }

+  return 1;  /* keep 'trap' on */

+}

+

--- /dev/null

+++ b/ldebug.h

@@ -1,0 +1,52 @@

+/*

+** $Id: ldebug.h $

+** Auxiliary functions from Debug Interface module

+** See Copyright Notice in lua.h

+*/

+

+#ifndef ldebug_h

+#define ldebug_h

+

+

+#include "lstate.h"

+

+

+#define pcRel(pc, p)	(cast_int((pc) - (p)->code) - 1)

+

+

+/* Active Lua function (given call info) */

+#define ci_func(ci)		(clLvalue(s2v((ci)->func)))

+

+

+#define resethookcount(L)	(L->hookcount = L->basehookcount)

+

+/*

+** mark for entries in 'lineinfo' array that has absolute information in

+** 'abslineinfo' array

+*/

+#define ABSLINEINFO	(-0x80)

+

+LUAI_FUNC int luaG_getfuncline (const Proto *f, int pc);

+LUAI_FUNC const char *luaG_findlocal (lua_State *L, CallInfo *ci, int n,

+                                                    StkId *pos);

+LUAI_FUNC l_noret luaG_typeerror (lua_State *L, const TValue *o,

+                                                const char *opname);

+LUAI_FUNC l_noret luaG_forerror (lua_State *L, const TValue *o,

+                                               const char *what);

+LUAI_FUNC l_noret luaG_concaterror (lua_State *L, const TValue *p1,

+                                                  const TValue *p2);

+LUAI_FUNC l_noret luaG_opinterror (lua_State *L, const TValue *p1,

+                                                 const TValue *p2,

+                                                 const char *msg);

+LUAI_FUNC l_noret luaG_tointerror (lua_State *L, const TValue *p1,

+                                                 const TValue *p2);

+LUAI_FUNC l_noret luaG_ordererror (lua_State *L, const TValue *p1,

+                                                 const TValue *p2);

+LUAI_FUNC l_noret luaG_runerror (lua_State *L, const char *fmt, ...);

+LUAI_FUNC const char *luaG_addinfo (lua_State *L, const char *msg,

+                                                  TString *src, int line);

+LUAI_FUNC l_noret luaG_errormsg (lua_State *L);

+LUAI_FUNC int luaG_traceexec (lua_State *L, const Instruction *pc);

+

+

+#endif

--- /dev/null

+++ b/ldo.c

@@ -1,0 +1,857 @@

+/*

+** $Id: ldo.c $

+** Stack and Call structure of Lua

+** See Copyright Notice in lua.h

+*/

+

+#define ldo_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <setjmp.h>

+#include <stdlib.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "lapi.h"

+#include "ldebug.h"

+#include "ldo.h"

+#include "lfunc.h"

+#include "lgc.h"

+#include "lmem.h"

+#include "lobject.h"

+#include "lopcodes.h"

+#include "lparser.h"

+#include "lstate.h"

+#include "lstring.h"

+#include "ltable.h"

+#include "ltm.h"

+#include "lundump.h"

+#include "lvm.h"

+#include "lzio.h"

+

+

+

+#define errorstatus(s)	((s) > LUA_YIELD)

+

+

+/*

+** {======================================================

+** Error-recovery functions

+** =======================================================

+*/

+

+/*

+** LUAI_THROW/LUAI_TRY define how Lua does exception handling. By

+** default, Lua handles errors with exceptions when compiling as

+** C++ code, with _longjmp/_setjmp when asked to use them, and with

+** longjmp/setjmp otherwise.

+*/

+#if !defined(LUAI_THROW)				/* { */

+

+#if defined(__cplusplus) && !defined(LUA_USE_LONGJMP)	/* { */

+

+/* C++ exceptions */

+#define LUAI_THROW(L,c)		throw(c)

+#define LUAI_TRY(L,c,a) \

+	try { a } catch(...) { if ((c)->status == 0) (c)->status = -1; }

+#define luai_jmpbuf		int  /* dummy variable */

+

+#elif defined(LUA_USE_POSIX)				/* }{ */

+

+/* in POSIX, try _longjmp/_setjmp (more efficient) */

+#define LUAI_THROW(L,c)		_longjmp((c)->b, 1)

+#define LUAI_TRY(L,c,a)		if (_setjmp((c)->b) == 0) { a }

+#define luai_jmpbuf		jmp_buf

+

+#else							/* }{ */

+

+/* ISO C handling with long jumps */

+#define LUAI_THROW(L,c)		longjmp((c)->b, 1)

+#define LUAI_TRY(L,c,a)		if (setjmp((c)->b) == 0) { a }

+#define luai_jmpbuf		jmp_buf

+

+#endif							/* } */

+

+#endif							/* } */

+

+

+

+/* chain list of long jump buffers */

+struct lua_longjmp {

+  struct lua_longjmp *previous;

+  luai_jmpbuf b;

+  volatile int status;  /* error code */

+};

+

+

+void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop) {

+  switch (errcode) {

+    case LUA_ERRMEM: {  /* memory error? */

+      setsvalue2s(L, oldtop, G(L)->memerrmsg); /* reuse preregistered msg. */

+      break;

+    }

+    case LUA_ERRERR: {

+      setsvalue2s(L, oldtop, luaS_newliteral(L, "error in error handling"));

+      break;

+    }

+    case CLOSEPROTECT: {

+      setnilvalue(s2v(oldtop));  /* no error message */

+      break;

+    }

+    default: {

+      setobjs2s(L, oldtop, L->top - 1);  /* error message on current top */

+      break;

+    }

+  }

+  L->top = oldtop + 1;

+}

+

+

+l_noret luaD_throw (lua_State *L, int errcode) {

+  if (L->errorJmp) {  /* thread has an error handler? */

+    L->errorJmp->status = errcode;  /* set status */

+    LUAI_THROW(L, L->errorJmp);  /* jump to it */

+  }

+  else {  /* thread has no error handler */

+    global_State *g = G(L);

+    errcode = luaF_close(L, L->stack, errcode);  /* close all upvalues */

+    L->status = cast_byte(errcode);  /* mark it as dead */

+    if (g->mainthread->errorJmp) {  /* main thread has a handler? */

+      setobjs2s(L, g->mainthread->top++, L->top - 1);  /* copy error obj. */

+      luaD_throw(g->mainthread, errcode);  /* re-throw in main thread */

+    }

+    else {  /* no handler at all; abort */

+      if (g->panic) {  /* panic function? */

+        luaD_seterrorobj(L, errcode, L->top);  /* assume EXTRA_STACK */

+        if (L->ci->top < L->top)

+          L->ci->top = L->top;  /* pushing msg. can break this invariant */

+        lua_unlock(L);

+        g->panic(L);  /* call panic function (last chance to jump out) */

+      }

+      abort();

+    }

+  }

+}

+

+

+int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud) {

+  l_uint32 oldnCcalls = L->nCcalls;

+  struct lua_longjmp lj;

+  lj.status = LUA_OK;

+  lj.previous = L->errorJmp;  /* chain new error handler */

+  L->errorJmp = &lj;

+  LUAI_TRY(L, &lj,

+    (*f)(L, ud);

+  );

+  L->errorJmp = lj.previous;  /* restore old error handler */

+  L->nCcalls = oldnCcalls;

+  return lj.status;

+}

+

+/* }====================================================== */

+

+

+/*

+** {==================================================================

+** Stack reallocation

+** ===================================================================

+*/

+static void correctstack (lua_State *L, StkId oldstack, StkId newstack) {

+  CallInfo *ci;

+  UpVal *up;

+  if (oldstack == newstack)

+    return;  /* stack address did not change */

+  L->top = (L->top - oldstack) + newstack;

+  for (up = L->openupval; up != NULL; up = up->u.open.next)

+    up->v = s2v((uplevel(up) - oldstack) + newstack);

+  for (ci = L->ci; ci != NULL; ci = ci->previous) {

+    ci->top = (ci->top - oldstack) + newstack;

+    ci->func = (ci->func - oldstack) + newstack;

+    if (isLua(ci))

+      ci->u.l.trap = 1;  /* signal to update 'trap' in 'luaV_execute' */

+  }

+}

+

+

+/* some space for error handling */

+#define ERRORSTACKSIZE	(LUAI_MAXSTACK + 200)

+

+

+int luaD_reallocstack (lua_State *L, int newsize, int raiseerror) {

+  int lim = stacksize(L);

+  StkId newstack = luaM_reallocvector(L, L->stack,

+                      lim + EXTRA_STACK, newsize + EXTRA_STACK, StackValue);

+  lua_assert(newsize <= LUAI_MAXSTACK || newsize == ERRORSTACKSIZE);

+  if (unlikely(newstack == NULL)) {  /* reallocation failed? */

+    if (raiseerror)

+      luaM_error(L);

+    else return 0;  /* do not raise an error */

+  }

+  for (; lim < newsize; lim++)

+    setnilvalue(s2v(newstack + lim + EXTRA_STACK)); /* erase new segment */

+  correctstack(L, L->stack, newstack);

+  L->stack = newstack;

+  L->stack_last = L->stack + newsize;

+  return 1;

+}

+

+

+/*

+** Try to grow the stack by at least 'n' elements. when 'raiseerror'

+** is true, raises any error; otherwise, return 0 in case of errors.

+*/

+int luaD_growstack (lua_State *L, int n, int raiseerror) {

+  int size = stacksize(L);

+  if (unlikely(size > LUAI_MAXSTACK)) {

+    /* if stack is larger than maximum, thread is already using the

+       extra space reserved for errors, that is, thread is handling

+       a stack error; cannot grow further than that. */

+    lua_assert(stacksize(L) == ERRORSTACKSIZE);

+    if (raiseerror)

+      luaD_throw(L, LUA_ERRERR);  /* error inside message handler */

+    return 0;  /* if not 'raiseerror', just signal it */

+  }

+  else {

+    int newsize = 2 * size;  /* tentative new size */

+    int needed = cast_int(L->top - L->stack) + n;

+    if (newsize > LUAI_MAXSTACK)  /* cannot cross the limit */

+      newsize = LUAI_MAXSTACK;

+    if (newsize < needed)  /* but must respect what was asked for */

+      newsize = needed;

+    if (likely(newsize <= LUAI_MAXSTACK))

+      return luaD_reallocstack(L, newsize, raiseerror);

+    else {  /* stack overflow */

+      /* add extra size to be able to handle the error message */

+      luaD_reallocstack(L, ERRORSTACKSIZE, raiseerror);

+      if (raiseerror)

+        luaG_runerror(L, "stack overflow");

+      return 0;

+    }

+  }

+}

+

+

+static int stackinuse (lua_State *L) {

+  CallInfo *ci;

+  int res;

+  StkId lim = L->top;

+  for (ci = L->ci; ci != NULL; ci = ci->previous) {

+    if (lim < ci->top) lim = ci->top;

+  }

+  lua_assert(lim <= L->stack_last);

+  res = cast_int(lim - L->stack) + 1;  /* part of stack in use */

+  if (res < LUA_MINSTACK)

+    res = LUA_MINSTACK;  /* ensure a minimum size */

+  return res;

+}

+

+

+/*

+** If stack size is more than 3 times the current use, reduce that size

+** to twice the current use. (So, the final stack size is at most 2/3 the

+** previous size, and half of its entries are empty.)

+** As a particular case, if stack was handling a stack overflow and now

+** it is not, 'max' (limited by LUAI_MAXSTACK) will be smaller than

+** stacksize (equal to ERRORSTACKSIZE in this case), and so the stack

+** will be reduced to a "regular" size.

+*/

+void luaD_shrinkstack (lua_State *L) {

+  int inuse = stackinuse(L);

+  int nsize = inuse * 2;  /* proposed new size */

+  int max = inuse * 3;  /* maximum "reasonable" size */

+  if (max > LUAI_MAXSTACK) {

+    max = LUAI_MAXSTACK;  /* respect stack limit */

+    if (nsize > LUAI_MAXSTACK)

+      nsize = LUAI_MAXSTACK;

+  }

+  /* if thread is currently not handling a stack overflow and its

+     size is larger than maximum "reasonable" size, shrink it */

+  if (inuse <= LUAI_MAXSTACK && stacksize(L) > max)

+    luaD_reallocstack(L, nsize, 0);  /* ok if that fails */

+  else  /* don't change stack */

+    condmovestack(L,{},{});  /* (change only for debugging) */

+  luaE_shrinkCI(L);  /* shrink CI list */

+}

+

+

+void luaD_inctop (lua_State *L) {

+  luaD_checkstack(L, 1);

+  L->top++;

+}

+

+/* }================================================================== */

+

+

+/*

+** Call a hook for the given event. Make sure there is a hook to be

+** called. (Both 'L->hook' and 'L->hookmask', which trigger this

+** function, can be changed asynchronously by signals.)

+*/

+void luaD_hook (lua_State *L, int event, int line,

+                              int ftransfer, int ntransfer) {

+  lua_Hook hook = L->hook;

+  if (hook && L->allowhook) {  /* make sure there is a hook */

+    int mask = CIST_HOOKED;

+    CallInfo *ci = L->ci;

+    ptrdiff_t top = savestack(L, L->top);

+    ptrdiff_t ci_top = savestack(L, ci->top);

+    lua_Debug ar;

+    ar.event = event;

+    ar.currentline = line;

+    ar.i_ci = ci;

+    if (ntransfer != 0) {

+      mask |= CIST_TRAN;  /* 'ci' has transfer information */

+      ci->u2.transferinfo.ftransfer = ftransfer;

+      ci->u2.transferinfo.ntransfer = ntransfer;

+    }

+    luaD_checkstack(L, LUA_MINSTACK);  /* ensure minimum stack size */

+    if (L->top + LUA_MINSTACK > ci->top)

+      ci->top = L->top + LUA_MINSTACK;

+    L->allowhook = 0;  /* cannot call hooks inside a hook */

+    ci->callstatus |= mask;

+    lua_unlock(L);

+    (*hook)(L, &ar);

+    lua_lock(L);

+    lua_assert(!L->allowhook);

+    L->allowhook = 1;

+    ci->top = restorestack(L, ci_top);

+    L->top = restorestack(L, top);

+    ci->callstatus &= ~mask;

+  }

+}

+

+

+/*

+** Executes a call hook for Lua functions. This function is called

+** whenever 'hookmask' is not zero, so it checks whether call hooks are

+** active.

+*/

+void luaD_hookcall (lua_State *L, CallInfo *ci) {

+  int hook = (ci->callstatus & CIST_TAIL) ? LUA_HOOKTAILCALL : LUA_HOOKCALL;

+  Proto *p;

+  if (!(L->hookmask & LUA_MASKCALL))  /* some other hook? */

+    return;  /* don't call hook */

+  p = clLvalue(s2v(ci->func))->p;

+  L->top = ci->top;  /* prepare top */

+  ci->u.l.savedpc++;  /* hooks assume 'pc' is already incremented */

+  luaD_hook(L, hook, -1, 1, p->numparams);

+  ci->u.l.savedpc--;  /* correct 'pc' */

+}

+

+

+static StkId rethook (lua_State *L, CallInfo *ci, StkId firstres, int nres) {

+  ptrdiff_t oldtop = savestack(L, L->top);  /* hook may change top */

+  int delta = 0;

+  if (isLuacode(ci)) {

+    Proto *p = ci_func(ci)->p;

+    if (p->is_vararg)

+      delta = ci->u.l.nextraargs + p->numparams + 1;

+    if (L->top < ci->top)

+      L->top = ci->top;  /* correct top to run hook */

+  }

+  if (L->hookmask & LUA_MASKRET) {  /* is return hook on? */

+    int ftransfer;

+    ci->func += delta;  /* if vararg, back to virtual 'func' */

+    ftransfer = cast(unsigned short, firstres - ci->func);

+    luaD_hook(L, LUA_HOOKRET, -1, ftransfer, nres);  /* call it */

+    ci->func -= delta;

+  }

+  if (isLua(ci = ci->previous))

+    L->oldpc = pcRel(ci->u.l.savedpc, ci_func(ci)->p);  /* update 'oldpc' */

+  return restorestack(L, oldtop);

+}

+

+

+/*

+** Check whether 'func' has a '__call' metafield. If so, put it in the

+** stack, below original 'func', so that 'luaD_precall' can call it. Raise

+** an error if there is no '__call' metafield.

+*/

+void luaD_tryfuncTM (lua_State *L, StkId func) {

+  const TValue *tm = luaT_gettmbyobj(L, s2v(func), TM_CALL);

+  StkId p;

+  if (unlikely(ttisnil(tm)))

+    luaG_typeerror(L, s2v(func), "call");  /* nothing to call */

+  for (p = L->top; p > func; p--)  /* open space for metamethod */

+    setobjs2s(L, p, p-1);

+  L->top++;  /* stack space pre-allocated by the caller */

+  setobj2s(L, func, tm);  /* metamethod is the new function to be called */

+}

+

+

+/*

+** Given 'nres' results at 'firstResult', move 'wanted' of them to 'res'.

+** Handle most typical cases (zero results for commands, one result for

+** expressions, multiple results for tail calls/single parameters)

+** separated.

+*/

+static void moveresults (lua_State *L, StkId res, int nres, int wanted) {

+  StkId firstresult;

+  int i;

+  switch (wanted) {  /* handle typical cases separately */

+    case 0:  /* no values needed */

+      L->top = res;

+      return;

+    case 1:  /* one value needed */

+      if (nres == 0)   /* no results? */

+        setnilvalue(s2v(res));  /* adjust with nil */

+      else

+        setobjs2s(L, res, L->top - nres);  /* move it to proper place */

+      L->top = res + 1;

+      return;

+    case LUA_MULTRET:

+      wanted = nres;  /* we want all results */

+      break;

+    default:  /* multiple results (or to-be-closed variables) */

+      if (hastocloseCfunc(wanted)) {  /* to-be-closed variables? */

+        ptrdiff_t savedres = savestack(L, res);

+        luaF_close(L, res, LUA_OK);  /* may change the stack */

+        res = restorestack(L, savedres);

+        wanted = codeNresults(wanted);  /* correct value */

+        if (wanted == LUA_MULTRET)

+          wanted = nres;

+      }

+      break;

+  }

+  firstresult = L->top - nres;  /* index of first result */

+  /* move all results to correct place */

+  for (i = 0; i < nres && i < wanted; i++)

+    setobjs2s(L, res + i, firstresult + i);

+  for (; i < wanted; i++)  /* complete wanted number of results */

+    setnilvalue(s2v(res + i));

+  L->top = res + wanted;  /* top points after the last result */

+}

+

+

+/*

+** Finishes a function call: calls hook if necessary, removes CallInfo,

+** moves current number of results to proper place.

+*/

+void luaD_poscall (lua_State *L, CallInfo *ci, int nres) {

+  if (L->hookmask)

+    L->top = rethook(L, ci, L->top - nres, nres);

+  L->ci = ci->previous;  /* back to caller */

+  /* move results to proper place */

+  moveresults(L, ci->func, nres, ci->nresults);

+}

+

+

+

+#define next_ci(L)  (L->ci->next ? L->ci->next : luaE_extendCI(L))

+

+

+/*

+** Prepare a function for a tail call, building its call info on top

+** of the current call info. 'narg1' is the number of arguments plus 1

+** (so that it includes the function itself).

+*/

+void luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func, int narg1) {

+  Proto *p = clLvalue(s2v(func))->p;

+  int fsize = p->maxstacksize;  /* frame size */

+  int nfixparams = p->numparams;

+  int i;

+  for (i = 0; i < narg1; i++)  /* move down function and arguments */

+    setobjs2s(L, ci->func + i, func + i);

+  checkstackGC(L, fsize);

+  func = ci->func;  /* moved-down function */

+  for (; narg1 <= nfixparams; narg1++)

+    setnilvalue(s2v(func + narg1));  /* complete missing arguments */

+  ci->top = func + 1 + fsize;  /* top for new function */

+  lua_assert(ci->top <= L->stack_last);

+  ci->u.l.savedpc = p->code;  /* starting point */

+  ci->callstatus |= CIST_TAIL;

+  L->top = func + narg1;  /* set top */

+}

+

+

+/*

+** Prepares the call to a function (C or Lua). For C functions, also do

+** the call. The function to be called is at '*func'.  The arguments

+** are on the stack, right after the function.  Returns the CallInfo

+** to be executed, if it was a Lua function. Otherwise (a C function)

+** returns NULL, with all the results on the stack, starting at the

+** original function position.

+*/

+CallInfo *luaD_precall (lua_State *L, StkId func, int nresults) {

+  lua_CFunction f;

+ retry:

+  switch (ttypetag(s2v(func))) {

+    case LUA_VCCL:  /* C closure */

+      f = clCvalue(s2v(func))->f;

+      goto Cfunc;

+    case LUA_VLCF:  /* light C function */

+      f = fvalue(s2v(func));

+     Cfunc: {

+      int n;  /* number of returns */

+      CallInfo *ci;

+      checkstackGCp(L, LUA_MINSTACK, func);  /* ensure minimum stack size */

+      L->ci = ci = next_ci(L);

+      ci->nresults = nresults;

+      ci->callstatus = CIST_C;

+      ci->top = L->top + LUA_MINSTACK;

+      ci->func = func;

+      lua_assert(ci->top <= L->stack_last);

+      if (L->hookmask & LUA_MASKCALL) {

+        int narg = cast_int(L->top - func) - 1;

+        luaD_hook(L, LUA_HOOKCALL, -1, 1, narg);

+      }

+      lua_unlock(L);

+      n = (*f)(L);  /* do the actual call */

+      lua_lock(L);

+      api_checknelems(L, n);

+      luaD_poscall(L, ci, n);

+      return NULL;

+    }

+    case LUA_VLCL: {  /* Lua function */

+      CallInfo *ci;

+      Proto *p = clLvalue(s2v(func))->p;

+      int narg = cast_int(L->top - func) - 1;  /* number of real arguments */

+      int nfixparams = p->numparams;

+      int fsize = p->maxstacksize;  /* frame size */

+      checkstackGCp(L, fsize, func);

+      L->ci = ci = next_ci(L);

+      ci->nresults = nresults;

+      ci->u.l.savedpc = p->code;  /* starting point */

+      ci->top = func + 1 + fsize;

+      ci->func = func;

+      L->ci = ci;

+      for (; narg < nfixparams; narg++)

+        setnilvalue(s2v(L->top++));  /* complete missing arguments */

+      lua_assert(ci->top <= L->stack_last);

+      return ci;

+    }

+    default: {  /* not a function */

+      checkstackGCp(L, 1, func);  /* space for metamethod */

+      luaD_tryfuncTM(L, func);  /* try to get '__call' metamethod */

+      goto retry;  /* try again with metamethod */

+    }

+  }

+}

+

+

+/*

+** Call a function (C or Lua) through C. 'inc' can be 1 (increment

+** number of recursive invocations in the C stack) or nyci (the same

+** plus increment number of non-yieldable calls).

+*/

+static void ccall (lua_State *L, StkId func, int nResults, int inc) {

+  CallInfo *ci;

+  L->nCcalls += inc;

+  if (unlikely(getCcalls(L) >= LUAI_MAXCCALLS))

+    luaE_checkcstack(L);

+  if ((ci = luaD_precall(L, func, nResults)) != NULL) {  /* Lua function? */

+    ci->callstatus = CIST_FRESH;  /* mark that it is a "fresh" execute */

+    luaV_execute(L, ci);  /* call it */

+  }

+  L->nCcalls -= inc;

+}

+

+

+/*

+** External interface for 'ccall'

+*/

+void luaD_call (lua_State *L, StkId func, int nResults) {

+  ccall(L, func, nResults, 1);

+}

+

+

+/*

+** Similar to 'luaD_call', but does not allow yields during the call.

+*/

+void luaD_callnoyield (lua_State *L, StkId func, int nResults) {

+  ccall(L, func, nResults, nyci);

+}

+

+

+/*

+** Completes the execution of an interrupted C function, calling its

+** continuation function.

+*/

+static void finishCcall (lua_State *L, int status) {

+  CallInfo *ci = L->ci;

+  int n;

+  /* must have a continuation and must be able to call it */

+  lua_assert(ci->u.c.k != NULL && yieldable(L));

+  /* error status can only happen in a protected call */

+  lua_assert((ci->callstatus & CIST_YPCALL) || status == LUA_YIELD);

+  if (ci->callstatus & CIST_YPCALL) {  /* was inside a pcall? */

+    ci->callstatus &= ~CIST_YPCALL;  /* continuation is also inside it */

+    L->errfunc = ci->u.c.old_errfunc;  /* with the same error function */

+  }

+  /* finish 'lua_callk'/'lua_pcall'; CIST_YPCALL and 'errfunc' already

+     handled */

+  adjustresults(L, ci->nresults);

+  lua_unlock(L);

+  n = (*ci->u.c.k)(L, status, ci->u.c.ctx);  /* call continuation function */

+  lua_lock(L);

+  api_checknelems(L, n);

+  luaD_poscall(L, ci, n);  /* finish 'luaD_call' */

+}

+

+

+/*

+** Executes "full continuation" (everything in the stack) of a

+** previously interrupted coroutine until the stack is empty (or another

+** interruption long-jumps out of the loop). If the coroutine is

+** recovering from an error, 'ud' points to the error status, which must

+** be passed to the first continuation function (otherwise the default

+** status is LUA_YIELD).

+*/

+static void unroll (lua_State *L, void *ud) {

+  CallInfo *ci;

+  if (ud != NULL)  /* error status? */

+    finishCcall(L, *(int *)ud);  /* finish 'lua_pcallk' callee */

+  while ((ci = L->ci) != &L->base_ci) {  /* something in the stack */

+    if (!isLua(ci))  /* C function? */

+      finishCcall(L, LUA_YIELD);  /* complete its execution */

+    else {  /* Lua function */

+      luaV_finishOp(L);  /* finish interrupted instruction */

+      luaV_execute(L, ci);  /* execute down to higher C 'boundary' */

+    }

+  }

+}

+

+

+/*

+** Try to find a suspended protected call (a "recover point") for the

+** given thread.

+*/

+static CallInfo *findpcall (lua_State *L) {

+  CallInfo *ci;

+  for (ci = L->ci; ci != NULL; ci = ci->previous) {  /* search for a pcall */

+    if (ci->callstatus & CIST_YPCALL)

+      return ci;

+  }

+  return NULL;  /* no pending pcall */

+}

+

+

+/*

+** Recovers from an error in a coroutine. Finds a recover point (if

+** there is one) and completes the execution of the interrupted

+** 'luaD_pcall'. If there is no recover point, returns zero.

+*/

+static int recover (lua_State *L, int status) {

+  StkId oldtop;

+  CallInfo *ci = findpcall(L);

+  if (ci == NULL) return 0;  /* no recovery point */

+  /* "finish" luaD_pcall */

+  oldtop = restorestack(L, ci->u2.funcidx);

+  L->ci = ci;

+  L->allowhook = getoah(ci->callstatus);  /* restore original 'allowhook' */

+  status = luaF_close(L, oldtop, status);  /* may change the stack */

+  oldtop = restorestack(L, ci->u2.funcidx);

+  luaD_seterrorobj(L, status, oldtop);

+  luaD_shrinkstack(L);   /* restore stack size in case of overflow */

+  L->errfunc = ci->u.c.old_errfunc;

+  return 1;  /* continue running the coroutine */

+}

+

+

+/*

+** Signal an error in the call to 'lua_resume', not in the execution

+** of the coroutine itself. (Such errors should not be handled by any

+** coroutine error handler and should not kill the coroutine.)

+*/

+static int resume_error (lua_State *L, const char *msg, int narg) {

+  L->top -= narg;  /* remove args from the stack */

+  setsvalue2s(L, L->top, luaS_new(L, msg));  /* push error message */

+  api_incr_top(L);

+  lua_unlock(L);

+  return LUA_ERRRUN;

+}

+

+

+/*

+** Do the work for 'lua_resume' in protected mode. Most of the work

+** depends on the status of the coroutine: initial state, suspended

+** inside a hook, or regularly suspended (optionally with a continuation

+** function), plus erroneous cases: non-suspended coroutine or dead

+** coroutine.

+*/

+static void resume (lua_State *L, void *ud) {

+  int n = *(cast(int*, ud));  /* number of arguments */

+  StkId firstArg = L->top - n;  /* first argument */

+  CallInfo *ci = L->ci;

+  if (L->status == LUA_OK)  /* starting a coroutine? */

+    ccall(L, firstArg - 1, LUA_MULTRET, 1);  /* just call its body */

+  else {  /* resuming from previous yield */

+    lua_assert(L->status == LUA_YIELD);

+    L->status = LUA_OK;  /* mark that it is running (again) */

+    luaE_incCstack(L);  /* control the C stack */

+    if (isLua(ci))  /* yielded inside a hook? */

+      luaV_execute(L, ci);  /* just continue running Lua code */

+    else {  /* 'common' yield */

+      if (ci->u.c.k != NULL) {  /* does it have a continuation function? */

+        lua_unlock(L);

+        n = (*ci->u.c.k)(L, LUA_YIELD, ci->u.c.ctx); /* call continuation */

+        lua_lock(L);

+        api_checknelems(L, n);

+      }

+      luaD_poscall(L, ci, n);  /* finish 'luaD_call' */

+    }

+    unroll(L, NULL);  /* run continuation */

+  }

+}

+

+LUA_API int lua_resume (lua_State *L, lua_State *from, int nargs,

+                                      int *nresults) {

+  int status;

+  lua_lock(L);

+  if (L->status == LUA_OK) {  /* may be starting a coroutine */

+    if (L->ci != &L->base_ci)  /* not in base level? */

+      return resume_error(L, "cannot resume non-suspended coroutine", nargs);

+    else if (L->top - (L->ci->func + 1) == nargs)  /* no function? */

+      return resume_error(L, "cannot resume dead coroutine", nargs);

+  }

+  else if (L->status != LUA_YIELD)  /* ended with errors? */

+    return resume_error(L, "cannot resume dead coroutine", nargs);

+  L->nCcalls = (from) ? getCcalls(from) : 0;

+  luai_userstateresume(L, nargs);

+  api_checknelems(L, (L->status == LUA_OK) ? nargs + 1 : nargs);

+  status = luaD_rawrunprotected(L, resume, &nargs);

+   /* continue running after recoverable errors */

+  while (errorstatus(status) && recover(L, status)) {

+    /* unroll continuation */

+    status = luaD_rawrunprotected(L, unroll, &status);

+  }

+  if (likely(!errorstatus(status)))

+    lua_assert(status == L->status);  /* normal end or yield */

+  else {  /* unrecoverable error */

+    L->status = cast_byte(status);  /* mark thread as 'dead' */

+    luaD_seterrorobj(L, status, L->top);  /* push error message */

+    L->ci->top = L->top;

+  }

+  *nresults = (status == LUA_YIELD) ? L->ci->u2.nyield

+                                    : cast_int(L->top - (L->ci->func + 1));

+  lua_unlock(L);

+  return status;

+}

+

+

+LUA_API int lua_isyieldable (lua_State *L) {

+  return yieldable(L);

+}

+

+

+LUA_API int lua_yieldk (lua_State *L, int nresults, lua_KContext ctx,

+                        lua_KFunction k) {

+  CallInfo *ci;

+  luai_userstateyield(L, nresults);

+  lua_lock(L);

+  ci = L->ci;

+  api_checknelems(L, nresults);

+  if (unlikely(!yieldable(L))) {

+    if (L != G(L)->mainthread)

+      luaG_runerror(L, "attempt to yield across a C-call boundary");

+    else

+      luaG_runerror(L, "attempt to yield from outside a coroutine");

+  }

+  L->status = LUA_YIELD;

+  if (isLua(ci)) {  /* inside a hook? */

+    lua_assert(!isLuacode(ci));

+    api_check(L, k == NULL, "hooks cannot continue after yielding");

+    ci->u2.nyield = 0;  /* no results */

+  }

+  else {

+    if ((ci->u.c.k = k) != NULL)  /* is there a continuation? */

+      ci->u.c.ctx = ctx;  /* save context */

+    ci->u2.nyield = nresults;  /* save number of results */

+    luaD_throw(L, LUA_YIELD);

+  }

+  lua_assert(ci->callstatus & CIST_HOOKED);  /* must be inside a hook */

+  lua_unlock(L);

+  return 0;  /* return to 'luaD_hook' */

+}

+

+

+/*

+** Call the C function 'func' in protected mode, restoring basic

+** thread information ('allowhook', etc.) and in particular

+** its stack level in case of errors.

+*/

+int luaD_pcall (lua_State *L, Pfunc func, void *u,

+                ptrdiff_t old_top, ptrdiff_t ef) {

+  int status;

+  CallInfo *old_ci = L->ci;

+  lu_byte old_allowhooks = L->allowhook;

+  ptrdiff_t old_errfunc = L->errfunc;

+  L->errfunc = ef;

+  status = luaD_rawrunprotected(L, func, u);

+  if (unlikely(status != LUA_OK)) {  /* an error occurred? */

+    StkId oldtop = restorestack(L, old_top);

+    L->ci = old_ci;

+    L->allowhook = old_allowhooks;

+    status = luaF_close(L, oldtop, status);

+    oldtop = restorestack(L, old_top);  /* previous call may change stack */

+    luaD_seterrorobj(L, status, oldtop);

+    luaD_shrinkstack(L);   /* restore stack size in case of overflow */

+  }

+  L->errfunc = old_errfunc;

+  return status;

+}

+

+

+

+/*

+** Execute a protected parser.

+*/

+struct SParser {  /* data to 'f_parser' */

+  ZIO *z;

+  Mbuffer buff;  /* dynamic structure used by the scanner */

+  Dyndata dyd;  /* dynamic structures used by the parser */

+  const char *mode;

+  const char *name;

+};

+

+

+static void checkmode (lua_State *L, const char *mode, const char *x) {

+  if (mode && strchr(mode, x[0]) == NULL) {

+    luaO_pushfstring(L,

+       "attempt to load a %s chunk (mode is '%s')", x, mode);

+    luaD_throw(L, LUA_ERRSYNTAX);

+  }

+}

+

+

+static void f_parser (lua_State *L, void *ud) {

+  LClosure *cl;

+  struct SParser *p = cast(struct SParser *, ud);

+  int c = zgetc(p->z);  /* read first character */

+  if (c == LUA_SIGNATURE[0]) {

+    checkmode(L, p->mode, "binary");

+    cl = luaU_undump(L, p->z, p->name);

+  }

+  else {

+    checkmode(L, p->mode, "text");

+    cl = luaY_parser(L, p->z, &p->buff, &p->dyd, p->name, c);

+  }

+  lua_assert(cl->nupvalues == cl->p->sizeupvalues);

+  luaF_initupvals(L, cl);

+}

+

+

+int luaD_protectedparser (lua_State *L, ZIO *z, const char *name,

+                                        const char *mode) {

+  struct SParser p;

+  int status;

+  incnny(L);  /* cannot yield during parsing */

+  p.z = z; p.name = name; p.mode = mode;

+  p.dyd.actvar.arr = NULL; p.dyd.actvar.size = 0;

+  p.dyd.gt.arr = NULL; p.dyd.gt.size = 0;

+  p.dyd.label.arr = NULL; p.dyd.label.size = 0;

+  luaZ_initbuffer(L, &p.buff);

+  status = luaD_pcall(L, f_parser, &p, savestack(L, L->top), L->errfunc);

+  luaZ_freebuffer(L, &p.buff);

+  luaM_freearray(L, p.dyd.actvar.arr, p.dyd.actvar.size);

+  luaM_freearray(L, p.dyd.gt.arr, p.dyd.gt.size);

+  luaM_freearray(L, p.dyd.label.arr, p.dyd.label.size);

+  decnny(L);

+  return status;

+}

+

+

--- /dev/null

+++ b/ldo.h

@@ -1,0 +1,78 @@

+/*

+** $Id: ldo.h $

+** Stack and Call structure of Lua

+** See Copyright Notice in lua.h

+*/

+

+#ifndef ldo_h

+#define ldo_h

+

+

+#include "lobject.h"

+#include "lstate.h"

+#include "lzio.h"

+

+

+/*

+** Macro to check stack size and grow stack if needed.  Parameters

+** 'pre'/'pos' allow the macro to preserve a pointer into the

+** stack across reallocations, doing the work only when needed.

+** It also allows the running of one GC step when the stack is

+** reallocated.

+** 'condmovestack' is used in heavy tests to force a stack reallocation

+** at every check.

+*/

+#define luaD_checkstackaux(L,n,pre,pos)  \

+	if (L->stack_last - L->top <= (n)) \

+	  { pre; luaD_growstack(L, n, 1); pos; } \

+        else { condmovestack(L,pre,pos); }

+

+/* In general, 'pre'/'pos' are empty (nothing to save) */

+#define luaD_checkstack(L,n)	luaD_checkstackaux(L,n,(void)0,(void)0)

+

+

+

+#define savestack(L,p)		((char *)(p) - (char *)L->stack)

+#define restorestack(L,n)	((StkId)((char *)L->stack + (n)))

+

+

+/* macro to check stack size, preserving 'p' */

+#define checkstackGCp(L,n,p)  \

+  luaD_checkstackaux(L, n, \

+    ptrdiff_t t__ = savestack(L, p);  /* save 'p' */ \

+    luaC_checkGC(L),  /* stack grow uses memory */ \

+    p = restorestack(L, t__))  /* 'pos' part: restore 'p' */

+

+

+/* macro to check stack size and GC */

+#define checkstackGC(L,fsize)  \

+	luaD_checkstackaux(L, (fsize), luaC_checkGC(L), (void)0)

+

+

+/* type of protected functions, to be ran by 'runprotected' */

+typedef void (*Pfunc) (lua_State *L, void *ud);

+

+LUAI_FUNC void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop);

+LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name,

+                                                  const char *mode);

+LUAI_FUNC void luaD_hook (lua_State *L, int event, int line,

+                                        int fTransfer, int nTransfer);

+LUAI_FUNC void luaD_hookcall (lua_State *L, CallInfo *ci);

+LUAI_FUNC void luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func, int n);

+LUAI_FUNC CallInfo *luaD_precall (lua_State *L, StkId func, int nResults);

+LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults);

+LUAI_FUNC void luaD_callnoyield (lua_State *L, StkId func, int nResults);

+LUAI_FUNC void luaD_tryfuncTM (lua_State *L, StkId func);

+LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u,

+                                        ptrdiff_t oldtop, ptrdiff_t ef);

+LUAI_FUNC void luaD_poscall (lua_State *L, CallInfo *ci, int nres);

+LUAI_FUNC int luaD_reallocstack (lua_State *L, int newsize, int raiseerror);

+LUAI_FUNC int luaD_growstack (lua_State *L, int n, int raiseerror);

+LUAI_FUNC void luaD_shrinkstack (lua_State *L);

+LUAI_FUNC void luaD_inctop (lua_State *L);

+

+LUAI_FUNC l_noret luaD_throw (lua_State *L, int errcode);

+LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);

+

+#endif

+

--- /dev/null

+++ b/ldump.c

@@ -1,0 +1,226 @@

+/*

+** $Id: ldump.c $

+** save precompiled Lua chunks

+** See Copyright Notice in lua.h

+*/

+

+#define ldump_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <stddef.h>

+

+#include "lua.h"

+

+#include "lobject.h"

+#include "lstate.h"

+#include "lundump.h"

+

+

+typedef struct {

+  lua_State *L;

+  lua_Writer writer;

+  void *data;

+  int strip;

+  int status;

+} DumpState;

+

+

+/*

+** All high-level dumps go through dumpVector; you can change it to

+** change the endianness of the result

+*/

+#define dumpVector(D,v,n)	dumpBlock(D,v,(n)*sizeof((v)[0]))

+

+#define dumpLiteral(D, s)	dumpBlock(D,s,sizeof(s) - sizeof(char))

+

+

+static void dumpBlock (DumpState *D, const void *b, size_t size) {

+  if (D->status == 0 && size > 0) {

+    lua_unlock(D->L);

+    D->status = (*D->writer)(D->L, b, size, D->data);

+    lua_lock(D->L);

+  }

+}

+

+

+#define dumpVar(D,x)		dumpVector(D,&x,1)

+

+

+static void dumpByte (DumpState *D, int y) {

+  lu_byte x = (lu_byte)y;

+  dumpVar(D, x);

+}

+

+

+/* dumpInt Buff Size */

+#define DIBS    ((sizeof(size_t) * 8 / 7) + 1)

+

+static void dumpSize (DumpState *D, size_t x) {

+  lu_byte buff[DIBS];

+  int n = 0;

+  do {

+    buff[DIBS - (++n)] = x & 0x7f;  /* fill buffer in reverse order */

+    x >>= 7;

+  } while (x != 0);

+  buff[DIBS - 1] |= 0x80;  /* mark last byte */

+  dumpVector(D, buff + DIBS - n, n);

+}

+

+

+static void dumpInt (DumpState *D, int x) {

+  dumpSize(D, x);

+}

+

+

+static void dumpNumber (DumpState *D, lua_Number x) {

+  dumpVar(D, x);

+}

+

+

+static void dumpInteger (DumpState *D, lua_Integer x) {

+  dumpVar(D, x);

+}

+

+

+static void dumpString (DumpState *D, const TString *s) {

+  if (s == NULL)

+    dumpSize(D, 0);

+  else {

+    size_t size = tsslen(s);

+    const char *str = getstr(s);

+    dumpSize(D, size + 1);

+    dumpVector(D, str, size);

+  }

+}

+

+

+static void dumpCode (DumpState *D, const Proto *f) {

+  dumpInt(D, f->sizecode);

+  dumpVector(D, f->code, f->sizecode);

+}

+

+

+static void dumpFunction(DumpState *D, const Proto *f, TString *psource);

+

+static void dumpConstants (DumpState *D, const Proto *f) {

+  int i;

+  int n = f->sizek;

+  dumpInt(D, n);

+  for (i = 0; i < n; i++) {

+    const TValue *o = &f->k[i];

+    int tt = ttypetag(o);

+    dumpByte(D, tt);

+    switch (tt) {

+      case LUA_VNUMFLT:

+        dumpNumber(D, fltvalue(o));

+        break;

+      case LUA_VNUMINT:

+        dumpInteger(D, ivalue(o));

+        break;

+      case LUA_VSHRSTR:

+      case LUA_VLNGSTR:

+        dumpString(D, tsvalue(o));

+        break;

+      default:

+        lua_assert(tt == LUA_VNIL || tt == LUA_VFALSE || tt == LUA_VTRUE);

+    }

+  }

+}

+

+

+static void dumpProtos (DumpState *D, const Proto *f) {

+  int i;

+  int n = f->sizep;

+  dumpInt(D, n);

+  for (i = 0; i < n; i++)

+    dumpFunction(D, f->p[i], f->source);

+}

+

+

+static void dumpUpvalues (DumpState *D, const Proto *f) {

+  int i, n = f->sizeupvalues;

+  dumpInt(D, n);

+  for (i = 0; i < n; i++) {

+    dumpByte(D, f->upvalues[i].instack);

+    dumpByte(D, f->upvalues[i].idx);

+    dumpByte(D, f->upvalues[i].kind);

+  }

+}

+

+

+static void dumpDebug (DumpState *D, const Proto *f) {

+  int i, n;

+  n = (D->strip) ? 0 : f->sizelineinfo;

+  dumpInt(D, n);

+  dumpVector(D, f->lineinfo, n);

+  n = (D->strip) ? 0 : f->sizeabslineinfo;

+  dumpInt(D, n);

+  for (i = 0; i < n; i++) {

+    dumpInt(D, f->abslineinfo[i].pc);

+    dumpInt(D, f->abslineinfo[i].line);

+  }

+  n = (D->strip) ? 0 : f->sizelocvars;

+  dumpInt(D, n);

+  for (i = 0; i < n; i++) {

+    dumpString(D, f->locvars[i].varname);

+    dumpInt(D, f->locvars[i].startpc);

+    dumpInt(D, f->locvars[i].endpc);

+  }

+  n = (D->strip) ? 0 : f->sizeupvalues;

+  dumpInt(D, n);

+  for (i = 0; i < n; i++)

+    dumpString(D, f->upvalues[i].name);

+}

+

+

+static void dumpFunction (DumpState *D, const Proto *f, TString *psource) {

+  if (D->strip || f->source == psource)

+    dumpString(D, NULL);  /* no debug info or same source as its parent */

+  else

+    dumpString(D, f->source);

+  dumpInt(D, f->linedefined);

+  dumpInt(D, f->lastlinedefined);

+  dumpByte(D, f->numparams);

+  dumpByte(D, f->is_vararg);

+  dumpByte(D, f->maxstacksize);

+  dumpCode(D, f);

+  dumpConstants(D, f);

+  dumpUpvalues(D, f);

+  dumpProtos(D, f);

+  dumpDebug(D, f);

+}

+

+

+static void dumpHeader (DumpState *D) {

+  dumpLiteral(D, LUA_SIGNATURE);

+  dumpByte(D, LUAC_VERSION);

+  dumpByte(D, LUAC_FORMAT);

+  dumpLiteral(D, LUAC_DATA);

+  dumpByte(D, sizeof(Instruction));

+  dumpByte(D, sizeof(lua_Integer));

+  dumpByte(D, sizeof(lua_Number));

+  dumpInteger(D, LUAC_INT);

+  dumpNumber(D, LUAC_NUM);

+}

+

+

+/*

+** dump Lua function as precompiled chunk

+*/

+int luaU_dump(lua_State *L, const Proto *f, lua_Writer w, void *data,

+              int strip) {

+  DumpState D;

+  D.L = L;

+  D.writer = w;

+  D.data = data;

+  D.strip = strip;

+  D.status = 0;

+  dumpHeader(&D);

+  dumpByte(&D, f->sizeupvalues);

+  dumpFunction(&D, f, NULL);

+  return D.status;

+}

+

--- /dev/null

+++ b/lfunc.c

@@ -1,0 +1,300 @@

+/*

+** $Id: lfunc.c $

+** Auxiliary functions to manipulate prototypes and closures

+** See Copyright Notice in lua.h

+*/

+

+#define lfunc_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <stddef.h>

+

+#include "lua.h"

+

+#include "ldebug.h"

+#include "ldo.h"

+#include "lfunc.h"

+#include "lgc.h"

+#include "lmem.h"

+#include "lobject.h"

+#include "lstate.h"

+

+

+

+CClosure *luaF_newCclosure (lua_State *L, int nupvals) {

+  GCObject *o = luaC_newobj(L, LUA_VCCL, sizeCclosure(nupvals));

+  CClosure *c = gco2ccl(o);

+  c->nupvalues = cast_byte(nupvals);

+  return c;

+}

+

+

+LClosure *luaF_newLclosure (lua_State *L, int nupvals) {

+  GCObject *o = luaC_newobj(L, LUA_VLCL, sizeLclosure(nupvals));

+  LClosure *c = gco2lcl(o);

+  c->p = NULL;

+  c->nupvalues = cast_byte(nupvals);

+  while (nupvals--) c->upvals[nupvals] = NULL;

+  return c;

+}

+

+

+/*

+** fill a closure with new closed upvalues

+*/

+void luaF_initupvals (lua_State *L, LClosure *cl) {

+  int i;

+  for (i = 0; i < cl->nupvalues; i++) {

+    GCObject *o = luaC_newobj(L, LUA_VUPVAL, sizeof(UpVal));

+    UpVal *uv = gco2upv(o);

+    uv->v = &uv->u.value;  /* make it closed */

+    setnilvalue(uv->v);

+    cl->upvals[i] = uv;

+    luaC_objbarrier(L, cl, uv);

+  }

+}

+

+

+/*

+** Create a new upvalue at the given level, and link it to the list of

+** open upvalues of 'L' after entry 'prev'.

+**/

+static UpVal *newupval (lua_State *L, int tbc, StkId level, UpVal **prev) {

+  GCObject *o = luaC_newobj(L, LUA_VUPVAL, sizeof(UpVal));

+  UpVal *uv = gco2upv(o);

+  UpVal *next = *prev;

+  uv->v = s2v(level);  /* current value lives in the stack */

+  uv->tbc = tbc;

+  uv->u.open.next = next;  /* link it to list of open upvalues */

+  uv->u.open.previous = prev;

+  if (next)

+    next->u.open.previous = &uv->u.open.next;

+  *prev = uv;

+  if (!isintwups(L)) {  /* thread not in list of threads with upvalues? */

+    L->twups = G(L)->twups;  /* link it to the list */

+    G(L)->twups = L;

+  }

+  return uv;

+}

+

+

+/*

+** Find and reuse, or create if it does not exist, an upvalue

+** at the given level.

+*/

+UpVal *luaF_findupval (lua_State *L, StkId level) {

+  UpVal **pp = &L->openupval;

+  UpVal *p;

+  lua_assert(isintwups(L) || L->openupval == NULL);

+  while ((p = *pp) != NULL && uplevel(p) >= level) {  /* search for it */

+    lua_assert(!isdead(G(L), p));

+    if (uplevel(p) == level)  /* corresponding upvalue? */

+      return p;  /* return it */

+    pp = &p->u.open.next;

+  }

+  /* not found: create a new upvalue after 'pp' */

+  return newupval(L, 0, level, pp);

+}

+

+

+static void callclose (lua_State *L, void *ud) {

+  UNUSED(ud);

+  luaD_callnoyield(L, L->top - 3, 0);

+}

+

+

+/*

+** Prepare closing method plus its arguments for object 'obj' with

+** error message 'err'. (This function assumes EXTRA_STACK.)

+*/

+static int prepclosingmethod (lua_State *L, TValue *obj, TValue *err) {

+  StkId top = L->top;

+  const TValue *tm = luaT_gettmbyobj(L, obj, TM_CLOSE);

+  if (ttisnil(tm))  /* no metamethod? */

+    return 0;  /* nothing to call */

+  setobj2s(L, top, tm);  /* will call metamethod... */

+  setobj2s(L, top + 1, obj);  /* with 'self' as the 1st argument */

+  setobj2s(L, top + 2, err);  /* and error msg. as 2nd argument */

+  L->top = top + 3;  /* add function and arguments */

+  return 1;

+}

+

+

+/*

+** Raise an error with message 'msg', inserting the name of the

+** local variable at position 'level' in the stack.

+*/

+static void varerror (lua_State *L, StkId level, const char *msg) {

+  int idx = cast_int(level - L->ci->func);

+  const char *vname = luaG_findlocal(L, L->ci, idx, NULL);

+  if (vname == NULL) vname = "?";

+  luaG_runerror(L, msg, vname);

+}

+

+

+/*

+** Prepare and call a closing method. If status is OK, code is still

+** inside the original protected call, and so any error will be handled

+** there. Otherwise, a previous error already activated the original

+** protected call, and so the call to the closing method must be

+** protected here. (A status == CLOSEPROTECT behaves like a previous

+** error, to also run the closing method in protected mode).

+** If status is OK, the call to the closing method will be pushed

+** at the top of the stack. Otherwise, values are pushed after

+** the 'level' of the upvalue being closed, as everything after

+** that won't be used again.

+*/

+static int callclosemth (lua_State *L, StkId level, int status) {

+  TValue *uv = s2v(level);  /* value being closed */

+  if (likely(status == LUA_OK)) {

+    if (prepclosingmethod(L, uv, &G(L)->nilvalue))  /* something to call? */

+      callclose(L, NULL);  /* call closing method */

+    else if (!l_isfalse(uv))  /* non-closable non-false value? */

+      varerror(L, level, "attempt to close non-closable variable '%s'");

+  }

+  else {  /* must close the object in protected mode */

+    ptrdiff_t oldtop;

+    level++;  /* space for error message */

+    oldtop = savestack(L, level + 1);  /* top will be after that */

+    luaD_seterrorobj(L, status, level);  /* set error message */

+    if (prepclosingmethod(L, uv, s2v(level))) {  /* something to call? */

+      int newstatus = luaD_pcall(L, callclose, NULL, oldtop, 0);

+      if (newstatus != LUA_OK && status == CLOSEPROTECT)  /* first error? */

+        status = newstatus;  /* this will be the new error */

+      else {

+        if (newstatus != LUA_OK)  /* suppressed error? */

+          luaE_warnerror(L, "__close metamethod");

+        /* leave original error (or nil) on top */

+        L->top = restorestack(L, oldtop);

+      }

+    }

+    /* else no metamethod; ignore this case and keep original error */

+  }

+  return status;

+}

+

+

+/*

+** Try to create a to-be-closed upvalue

+** (can raise a memory-allocation error)

+*/

+static void trynewtbcupval (lua_State *L, void *ud) {

+  newupval(L, 1, cast(StkId, ud), &L->openupval);

+}

+

+

+/*

+** Create a to-be-closed upvalue. If there is a memory error

+** when creating the upvalue, the closing method must be called here,

+** as there is no upvalue to call it later.

+*/

+void luaF_newtbcupval (lua_State *L, StkId level) {

+  TValue *obj = s2v(level);

+  lua_assert(L->openupval == NULL || uplevel(L->openupval) < level);

+  if (!l_isfalse(obj)) {  /* false doesn't need to be closed */

+    int status;

+    const TValue *tm = luaT_gettmbyobj(L, obj, TM_CLOSE);

+    if (ttisnil(tm))  /* no metamethod? */

+      varerror(L, level, "variable '%s' got a non-closable value");

+    status = luaD_rawrunprotected(L, trynewtbcupval, level);

+    if (unlikely(status != LUA_OK)) {  /* memory error creating upvalue? */

+      lua_assert(status == LUA_ERRMEM);

+      luaD_seterrorobj(L, LUA_ERRMEM, level + 1);  /* save error message */

+      /* next call must succeed, as object is closable */

+      prepclosingmethod(L, s2v(level), s2v(level + 1));

+      callclose(L, NULL);  /* call closing method */

+      luaD_throw(L, LUA_ERRMEM);  /* throw memory error */

+    }

+  }

+}

+

+

+void luaF_unlinkupval (UpVal *uv) {

+  lua_assert(upisopen(uv));

+  *uv->u.open.previous = uv->u.open.next;

+  if (uv->u.open.next)

+    uv->u.open.next->u.open.previous = uv->u.open.previous;

+}

+

+

+int luaF_close (lua_State *L, StkId level, int status) {

+  UpVal *uv;

+  while ((uv = L->openupval) != NULL && uplevel(uv) >= level) {

+    TValue *slot = &uv->u.value;  /* new position for value */

+    lua_assert(uplevel(uv) < L->top);

+    if (uv->tbc && status != NOCLOSINGMETH) {

+      /* must run closing method, which may change the stack */

+      ptrdiff_t levelrel = savestack(L, level);

+      status = callclosemth(L, uplevel(uv), status);

+      level = restorestack(L, levelrel);

+    }

+    luaF_unlinkupval(uv);

+    setobj(L, slot, uv->v);  /* move value to upvalue slot */

+    uv->v = slot;  /* now current value lives here */

+    if (!iswhite(uv)) {  /* neither white nor dead? */

+      nw2black(uv);  /* closed upvalues cannot be gray */

+      luaC_barrier(L, uv, slot);

+    }

+  }

+  return status;

+}

+

+

+Proto *luaF_newproto (lua_State *L) {

+  GCObject *o = luaC_newobj(L, LUA_VPROTO, sizeof(Proto));

+  Proto *f = gco2p(o);

+  f->k = NULL;

+  f->sizek = 0;

+  f->p = NULL;

+  f->sizep = 0;

+  f->code = NULL;

+  f->sizecode = 0;

+  f->lineinfo = NULL;

+  f->sizelineinfo = 0;

+  f->abslineinfo = NULL;

+  f->sizeabslineinfo = 0;

+  f->upvalues = NULL;

+  f->sizeupvalues = 0;

+  f->numparams = 0;

+  f->is_vararg = 0;

+  f->maxstacksize = 0;

+  f->locvars = NULL;

+  f->sizelocvars = 0;

+  f->linedefined = 0;

+  f->lastlinedefined = 0;

+  f->source = NULL;

+  return f;

+}

+

+

+void luaF_freeproto (lua_State *L, Proto *f) {

+  luaM_freearray(L, f->code, f->sizecode);

+  luaM_freearray(L, f->p, f->sizep);

+  luaM_freearray(L, f->k, f->sizek);

+  luaM_freearray(L, f->lineinfo, f->sizelineinfo);

+  luaM_freearray(L, f->abslineinfo, f->sizeabslineinfo);

+  luaM_freearray(L, f->locvars, f->sizelocvars);

+  luaM_freearray(L, f->upvalues, f->sizeupvalues);

+  luaM_free(L, f);

+}

+

+

+/*

+** Look for n-th local variable at line 'line' in function 'func'.

+** Returns NULL if not found.

+*/

+const char *luaF_getlocalname (const Proto *f, int local_number, int pc) {

+  int i;

+  for (i = 0; i<f->sizelocvars && f->locvars[i].startpc <= pc; i++) {

+    if (pc < f->locvars[i].endpc) {  /* is variable active? */

+      local_number--;

+      if (local_number == 0)

+        return getstr(f->locvars[i].varname);

+    }

+  }

+  return NULL;  /* not found */

+}

+

--- /dev/null

+++ b/lfunc.h

@@ -1,0 +1,69 @@

+/*

+** $Id: lfunc.h $

+** Auxiliary functions to manipulate prototypes and closures

+** See Copyright Notice in lua.h

+*/

+

+#ifndef lfunc_h

+#define lfunc_h

+

+

+#include "lobject.h"

+

+

+#define sizeCclosure(n)	(cast_int(offsetof(CClosure, upvalue)) + \

+                         cast_int(sizeof(TValue)) * (n))

+

+#define sizeLclosure(n)	(cast_int(offsetof(LClosure, upvals)) + \

+                         cast_int(sizeof(TValue *)) * (n))

+

+

+/* test whether thread is in 'twups' list */

+#define isintwups(L)	(L->twups != L)

+

+

+/*

+** maximum number of upvalues in a closure (both C and Lua). (Value

+** must fit in a VM register.)

+*/

+#define MAXUPVAL	255

+

+

+#define upisopen(up)	((up)->v != &(up)->u.value)

+

+

+#define uplevel(up)	check_exp(upisopen(up), cast(StkId, (up)->v))

+

+

+/*

+** maximum number of misses before giving up the cache of closures

+** in prototypes

+*/

+#define MAXMISS		10

+

+

+/*

+** Special "status" for 'luaF_close'

+*/

+

+/* close upvalues without running their closing methods */

+#define NOCLOSINGMETH	(-1)

+

+/* close upvalues running all closing methods in protected mode */

+#define CLOSEPROTECT	(-2)

+

+

+LUAI_FUNC Proto *luaF_newproto (lua_State *L);

+LUAI_FUNC CClosure *luaF_newCclosure (lua_State *L, int nupvals);

+LUAI_FUNC LClosure *luaF_newLclosure (lua_State *L, int nupvals);

+LUAI_FUNC void luaF_initupvals (lua_State *L, LClosure *cl);

+LUAI_FUNC UpVal *luaF_findupval (lua_State *L, StkId level);

+LUAI_FUNC void luaF_newtbcupval (lua_State *L, StkId level);

+LUAI_FUNC int luaF_close (lua_State *L, StkId level, int status);

+LUAI_FUNC void luaF_unlinkupval (UpVal *uv);

+LUAI_FUNC void luaF_freeproto (lua_State *L, Proto *f);

+LUAI_FUNC const char *luaF_getlocalname (const Proto *func, int local_number,

+                                         int pc);

+

+

+#endif

--- /dev/null

+++ b/lgc.c

@@ -1,0 +1,1716 @@

+/*

+** $Id: lgc.c $

+** Garbage Collector

+** See Copyright Notice in lua.h

+*/

+

+#define lgc_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+#include <stdio.h>

+#include <string.h>

+

+

+#include "lua.h"

+

+#include "ldebug.h"

+#include "ldo.h"

+#include "lfunc.h"

+#include "lgc.h"

+#include "lmem.h"

+#include "lobject.h"

+#include "lstate.h"

+#include "lstring.h"

+#include "ltable.h"

+#include "ltm.h"

+

+

+/*

+** Maximum number of elements to sweep in each single step.

+** (Large enough to dissipate fixed overheads but small enough

+** to allow small steps for the collector.)

+*/

+#define GCSWEEPMAX	100

+

+/*

+** Maximum number of finalizers to call in each single step.

+*/

+#define GCFINMAX	10

+

+

+/*

+** Cost of calling one finalizer.

+*/

+#define GCFINALIZECOST	50

+

+

+/*

+** The equivalent, in bytes, of one unit of "work" (visiting a slot,

+** sweeping an object, etc.)

+*/

+#define WORK2MEM	sizeof(TValue)

+

+

+/*

+** macro to adjust 'pause': 'pause' is actually used like

+** 'pause / PAUSEADJ' (value chosen by tests)

+*/

+#define PAUSEADJ		100

+

+

+/* mask with all color bits */

+#define maskcolors	(bitmask(BLACKBIT) | WHITEBITS)

+

+/* mask with all GC bits */

+#define maskgcbits      (maskcolors | AGEBITS)

+

+

+/* macro to erase all color bits then set only the current white bit */

+#define makewhite(g,x)	\

+  (x->marked = cast_byte((x->marked & ~maskcolors) | luaC_white(g)))

+

+/* make an object gray (neither white nor black) */

+#define set2gray(x)	resetbits(x->marked, maskcolors)

+

+

+/* make an object black (coming from any color) */

+#define set2black(x)  \

+  (x->marked = cast_byte((x->marked & ~WHITEBITS) | bitmask(BLACKBIT)))

+

+

+#define valiswhite(x)   (iscollectable(x) && iswhite(gcvalue(x)))

+

+#define keyiswhite(n)   (keyiscollectable(n) && iswhite(gckey(n)))

+

+

+/*

+** Protected access to objects in values

+*/

+#define gcvalueN(o)     (iscollectable(o) ? gcvalue(o) : NULL)

+

+

+#define markvalue(g,o) { checkliveness(g->mainthread,o); \

+  if (valiswhite(o)) reallymarkobject(g,gcvalue(o)); }

+

+#define markkey(g, n)	{ if keyiswhite(n) reallymarkobject(g,gckey(n)); }

+

+#define markobject(g,t)	{ if (iswhite(t)) reallymarkobject(g, obj2gco(t)); }

+

+/*

+** mark an object that can be NULL (either because it is really optional,

+** or it was stripped as debug info, or inside an uncompleted structure)

+*/

+#define markobjectN(g,t)	{ if (t) markobject(g,t); }

+

+static void reallymarkobject (global_State *g, GCObject *o);

+static lu_mem atomic (lua_State *L);

+static void entersweep (lua_State *L);

+

+

+/*

+** {======================================================

+** Generic functions

+** =======================================================

+*/

+

+

+/*

+** one after last element in a hash array

+*/

+#define gnodelast(h)	gnode(h, cast_sizet(sizenode(h)))

+

+

+static GCObject **getgclist (GCObject *o) {

+  switch (o->tt) {

+    case LUA_VTABLE: return &gco2t(o)->gclist;

+    case LUA_VLCL: return &gco2lcl(o)->gclist;

+    case LUA_VCCL: return &gco2ccl(o)->gclist;

+    case LUA_VTHREAD: return &gco2th(o)->gclist;

+    case LUA_VPROTO: return &gco2p(o)->gclist;

+    case LUA_VUSERDATA: {

+      Udata *u = gco2u(o);

+      lua_assert(u->nuvalue > 0);

+      return &u->gclist;

+    }

+    default: lua_assert(0); return 0;

+  }

+}

+

+

+/*

+** Link a collectable object 'o' with a known type into the list 'p'.

+** (Must be a macro to access the 'gclist' field in different types.)

+*/

+#define linkgclist(o,p)	linkgclist_(obj2gco(o), &(o)->gclist, &(p))

+

+static void linkgclist_ (GCObject *o, GCObject **pnext, GCObject **list) {

+  lua_assert(!isgray(o));  /* cannot be in a gray list */

+  *pnext = *list;

+  *list = o;

+  set2gray(o);  /* now it is */

+}

+

+

+/*

+** Link a generic collectable object 'o' into the list 'p'.

+*/

+#define linkobjgclist(o,p) linkgclist_(obj2gco(o), getgclist(o), &(p))

+

+

+

+/*

+** Clear keys for empty entries in tables. If entry is empty, mark its

+** entry as dead. This allows the collection of the key, but keeps its

+** entry in the table: its removal could break a chain and could break

+** a table traversal.  Other places never manipulate dead keys, because

+** its associated empty value is enough to signal that the entry is

+** logically empty.

+*/

+static void clearkey (Node *n) {

+  lua_assert(isempty(gval(n)));

+  if (keyiscollectable(n))

+    setdeadkey(n);  /* unused key; remove it */

+}

+

+

+/*

+** tells whether a key or value can be cleared from a weak

+** table. Non-collectable objects are never removed from weak

+** tables. Strings behave as 'values', so are never removed too. for

+** other objects: if really collected, cannot keep them; for objects

+** being finalized, keep them in keys, but not in values

+*/

+static int iscleared (global_State *g, const GCObject *o) {

+  if (o == NULL) return 0;  /* non-collectable value */

+  else if (novariant(o->tt) == LUA_TSTRING) {

+    markobject(g, o);  /* strings are 'values', so are never weak */

+    return 0;

+  }

+  else return iswhite(o);

+}

+

+

+/*

+** Barrier that moves collector forward, that is, marks the white object

+** 'v' being pointed by the black object 'o'.  In the generational

+** mode, 'v' must also become old, if 'o' is old; however, it cannot

+** be changed directly to OLD, because it may still point to non-old

+** objects. So, it is marked as OLD0. In the next cycle it will become

+** OLD1, and in the next it will finally become OLD (regular old). By

+** then, any object it points to will also be old.  If called in the

+** incremental sweep phase, it clears the black object to white (sweep

+** it) to avoid other barrier calls for this same object. (That cannot

+** be done is generational mode, as its sweep does not distinguish

+** whites from deads.)

+*/

+void luaC_barrier_ (lua_State *L, GCObject *o, GCObject *v) {

+  global_State *g = G(L);

+  lua_assert(isblack(o) && iswhite(v) && !isdead(g, v) && !isdead(g, o));

+  if (keepinvariant(g)) {  /* must keep invariant? */

+    reallymarkobject(g, v);  /* restore invariant */

+    if (isold(o)) {

+      lua_assert(!isold(v));  /* white object could not be old */

+      setage(v, G_OLD0);  /* restore generational invariant */

+    }

+  }

+  else {  /* sweep phase */

+    lua_assert(issweepphase(g));

+    if (g->gckind == KGC_INC)  /* incremental mode? */

+      makewhite(g, o);  /* mark 'o' as white to avoid other barriers */

+  }

+}

+

+

+/*

+** barrier that moves collector backward, that is, mark the black object

+** pointing to a white object as gray again.

+*/

+void luaC_barrierback_ (lua_State *L, GCObject *o) {

+  global_State *g = G(L);

+  lua_assert(isblack(o) && !isdead(g, o));

+  lua_assert((g->gckind == KGC_GEN) == (isold(o) && getage(o) != G_TOUCHED1));

+  if (getage(o) == G_TOUCHED2)  /* already in gray list? */

+    set2gray(o);  /* make it gray to become touched1 */

+  else  /* link it in 'grayagain' and paint it gray */

+    linkobjgclist(o, g->grayagain);

+  if (isold(o))  /* generational mode? */

+    setage(o, G_TOUCHED1);  /* touched in current cycle */

+}

+

+

+void luaC_fix (lua_State *L, GCObject *o) {

+  global_State *g = G(L);

+  lua_assert(g->allgc == o);  /* object must be 1st in 'allgc' list! */

+  set2gray(o);  /* they will be gray forever */

+  setage(o, G_OLD);  /* and old forever */

+  g->allgc = o->next;  /* remove object from 'allgc' list */

+  o->next = g->fixedgc;  /* link it to 'fixedgc' list */

+  g->fixedgc = o;

+}

+

+

+/*

+** create a new collectable object (with given type and size) and link

+** it to 'allgc' list.

+*/

+GCObject *luaC_newobj (lua_State *L, int tt, size_t sz) {

+  global_State *g = G(L);

+  GCObject *o = cast(GCObject *, luaM_newobject(L, novariant(tt), sz));

+  o->marked = luaC_white(g);

+  o->tt = tt;

+  o->next = g->allgc;

+  g->allgc = o;

+  return o;

+}

+

+/* }====================================================== */

+

+

+

+/*

+** {======================================================

+** Mark functions

+** =======================================================

+*/

+

+

+/*

+** Mark an object.  Userdata with no user values, strings, and closed

+** upvalues are visited and turned black here.  Open upvalues are

+** already indirectly linked through their respective threads in the

+** 'twups' list, so they don't go to the gray list; nevertheless, they

+** are kept gray to avoid barriers, as their values will be revisited

+** by the thread or by 'remarkupvals'.  Other objects are added to the

+** gray list to be visited (and turned black) later.  Both userdata and

+** upvalues can call this function recursively, but this recursion goes

+** for at most two levels: An upvalue cannot refer to another upvalue

+** (only closures can), and a userdata's metatable must be a table.

+*/

+static void reallymarkobject (global_State *g, GCObject *o) {

+  switch (o->tt) {

+    case LUA_VSHRSTR:

+    case LUA_VLNGSTR: {

+      set2black(o);  /* nothing to visit */

+      break;

+    }

+    case LUA_VUPVAL: {

+      UpVal *uv = gco2upv(o);

+      if (upisopen(uv))

+        set2gray(uv);  /* open upvalues are kept gray */

+      else

+        set2black(uv);  /* closed upvalues are visited here */

+      markvalue(g, uv->v);  /* mark its content */

+      break;

+    }

+    case LUA_VUSERDATA: {

+      Udata *u = gco2u(o);

+      if (u->nuvalue == 0) {  /* no user values? */

+        markobjectN(g, u->metatable);  /* mark its metatable */

+        set2black(u);  /* nothing else to mark */

+        break;

+      }

+      /* else... */

+    }  /* FALLTHROUGH */

+    case LUA_VLCL: case LUA_VCCL: case LUA_VTABLE:

+    case LUA_VTHREAD: case LUA_VPROTO: {

+      linkobjgclist(o, g->gray);  /* to be visited later */

+      break;

+    }

+    default: lua_assert(0); break;

+  }

+}

+

+

+/*

+** mark metamethods for basic types

+*/

+static void markmt (global_State *g) {

+  int i;

+  for (i=0; i < LUA_NUMTAGS; i++)

+    markobjectN(g, g->mt[i]);

+}

+

+

+/*

+** mark all objects in list of being-finalized

+*/

+static lu_mem markbeingfnz (global_State *g) {

+  GCObject *o;

+  lu_mem count = 0;

+  for (o = g->tobefnz; o != NULL; o = o->next) {

+    count++;

+    markobject(g, o);

+  }

+  return count;

+}

+

+

+/*

+** For each non-marked thread, simulates a barrier between each open

+** upvalue and its value. (If the thread is collected, the value will be

+** assigned to the upvalue, but then it can be too late for the barrier

+** to act. The "barrier" does not need to check colors: A non-marked

+** thread must be young; upvalues cannot be older than their threads; so

+** any visited upvalue must be young too.) Also removes the thread from

+** the list, as it was already visited. Removes also threads with no

+** upvalues, as they have nothing to be checked. (If the thread gets an

+** upvalue later, it will be linked in the list again.)

+*/

+static int remarkupvals (global_State *g) {

+  lua_State *thread;

+  lua_State **p = &g->twups;

+  int work = 0;  /* estimate of how much work was done here */

+  while ((thread = *p) != NULL) {

+    work++;

+    if (!iswhite(thread) && thread->openupval != NULL)

+      p = &thread->twups;  /* keep marked thread with upvalues in the list */

+    else {  /* thread is not marked or without upvalues */

+      UpVal *uv;

+      lua_assert(!isold(thread) || thread->openupval == NULL);

+      *p = thread->twups;  /* remove thread from the list */

+      thread->twups = thread;  /* mark that it is out of list */

+      for (uv = thread->openupval; uv != NULL; uv = uv->u.open.next) {

+        lua_assert(getage(uv) <= getage(thread));

+        work++;

+        if (!iswhite(uv)) {  /* upvalue already visited? */

+          lua_assert(upisopen(uv) && isgray(uv));

+          markvalue(g, uv->v);  /* mark its value */

+        }

+      }

+    }

+  }

+  return work;

+}

+

+

+static void cleargraylists (global_State *g) {

+  g->gray = g->grayagain = NULL;

+  g->weak = g->allweak = g->ephemeron = NULL;

+}

+

+

+/*

+** mark root set and reset all gray lists, to start a new collection

+*/

+static void restartcollection (global_State *g) {

+  cleargraylists(g);

+  markobject(g, g->mainthread);

+  markvalue(g, &g->l_registry);

+  markmt(g);

+  markbeingfnz(g);  /* mark any finalizing object left from previous cycle */

+}

+

+/* }====================================================== */

+

+

+/*

+** {======================================================

+** Traverse functions

+** =======================================================

+*/

+

+

+/*

+** Check whether object 'o' should be kept in the 'grayagain' list for

+** post-processing by 'correctgraylist'. (It could put all old objects

+** in the list and leave all the work to 'correctgraylist', but it is

+** more efficient to avoid adding elements that will be removed.) Only

+** TOUCHED1 objects need to be in the list. TOUCHED2 doesn't need to go

+** back to a gray list, but then it must become OLD. (That is what

+** 'correctgraylist' does when it finds a TOUCHED2 object.)

+*/

+static void genlink (global_State *g, GCObject *o) {

+  lua_assert(isblack(o));

+  if (getage(o) == G_TOUCHED1) {  /* touched in this cycle? */

+    linkobjgclist(o, g->grayagain);  /* link it back in 'grayagain' */

+  }  /* everything else do not need to be linked back */

+  else if (getage(o) == G_TOUCHED2)

+    changeage(o, G_TOUCHED2, G_OLD);  /* advance age */

+}

+

+

+/*

+** Traverse a table with weak values and link it to proper list. During

+** propagate phase, keep it in 'grayagain' list, to be revisited in the

+** atomic phase. In the atomic phase, if table has any white value,

+** put it in 'weak' list, to be cleared.

+*/

+static void traverseweakvalue (global_State *g, Table *h) {

+  Node *n, *limit = gnodelast(h);

+  /* if there is array part, assume it may have white values (it is not

+     worth traversing it now just to check) */

+  int hasclears = (h->alimit > 0);

+  for (n = gnode(h, 0); n < limit; n++) {  /* traverse hash part */

+    if (isempty(gval(n)))  /* entry is empty? */

+      clearkey(n);  /* clear its key */

+    else {

+      lua_assert(!keyisnil(n));

+      markkey(g, n);

+      if (!hasclears && iscleared(g, gcvalueN(gval(n))))  /* a white value? */

+        hasclears = 1;  /* table will have to be cleared */

+    }

+  }

+  if (g->gcstate == GCSatomic && hasclears)

+    linkgclist(h, g->weak);  /* has to be cleared later */

+  else

+    linkgclist(h, g->grayagain);  /* must retraverse it in atomic phase */

+}

+

+

+/*

+** Traverse an ephemeron table and link it to proper list. Returns true

+** iff any object was marked during this traversal (which implies that

+** convergence has to continue). During propagation phase, keep table

+** in 'grayagain' list, to be visited again in the atomic phase. In

+** the atomic phase, if table has any white->white entry, it has to

+** be revisited during ephemeron convergence (as that key may turn

+** black). Otherwise, if it has any white key, table has to be cleared

+** (in the atomic phase). In generational mode, some tables

+** must be kept in some gray list for post-processing; this is done

+** by 'genlink'.

+*/

+static int traverseephemeron (global_State *g, Table *h, int inv) {

+  int marked = 0;  /* true if an object is marked in this traversal */

+  int hasclears = 0;  /* true if table has white keys */

+  int hasww = 0;  /* true if table has entry "white-key -> white-value" */

+  unsigned int i;

+  unsigned int asize = luaH_realasize(h);

+  unsigned int nsize = sizenode(h);

+  /* traverse array part */

+  for (i = 0; i < asize; i++) {

+    if (valiswhite(&h->array[i])) {

+      marked = 1;

+      reallymarkobject(g, gcvalue(&h->array[i]));

+    }

+  }

+  /* traverse hash part; if 'inv', traverse descending

+     (see 'convergeephemerons') */

+  for (i = 0; i < nsize; i++) {

+    Node *n = inv ? gnode(h, nsize - 1 - i) : gnode(h, i);

+    if (isempty(gval(n)))  /* entry is empty? */

+      clearkey(n);  /* clear its key */

+    else if (iscleared(g, gckeyN(n))) {  /* key is not marked (yet)? */

+      hasclears = 1;  /* table must be cleared */

+      if (valiswhite(gval(n)))  /* value not marked yet? */

+        hasww = 1;  /* white-white entry */

+    }

+    else if (valiswhite(gval(n))) {  /* value not marked yet? */

+      marked = 1;

+      reallymarkobject(g, gcvalue(gval(n)));  /* mark it now */

+    }

+  }

+  /* link table into proper list */

+  if (g->gcstate == GCSpropagate)

+    linkgclist(h, g->grayagain);  /* must retraverse it in atomic phase */

+  else if (hasww)  /* table has white->white entries? */

+    linkgclist(h, g->ephemeron);  /* have to propagate again */

+  else if (hasclears)  /* table has white keys? */

+    linkgclist(h, g->allweak);  /* may have to clean white keys */

+  else

+    genlink(g, obj2gco(h));  /* check whether collector still needs to see it */

+  return marked;

+}

+

+

+static void traversestrongtable (global_State *g, Table *h) {

+  Node *n, *limit = gnodelast(h);

+  unsigned int i;

+  unsigned int asize = luaH_realasize(h);

+  for (i = 0; i < asize; i++)  /* traverse array part */

+    markvalue(g, &h->array[i]);

+  for (n = gnode(h, 0); n < limit; n++) {  /* traverse hash part */

+    if (isempty(gval(n)))  /* entry is empty? */

+      clearkey(n);  /* clear its key */

+    else {

+      lua_assert(!keyisnil(n));

+      markkey(g, n);

+      markvalue(g, gval(n));

+    }

+  }

+  genlink(g, obj2gco(h));

+}

+

+

+static lu_mem traversetable (global_State *g, Table *h) {

+  const char *weakkey, *weakvalue;

+  const TValue *mode = gfasttm(g, h->metatable, TM_MODE);

+  markobjectN(g, h->metatable);

+  if (mode && ttisstring(mode) &&  /* is there a weak mode? */

+      (cast_void(weakkey = strchr(svalue(mode), 'k')),

+       cast_void(weakvalue = strchr(svalue(mode), 'v')),

+       (weakkey || weakvalue))) {  /* is really weak? */

+    if (!weakkey)  /* strong keys? */

+      traverseweakvalue(g, h);

+    else if (!weakvalue)  /* strong values? */

+      traverseephemeron(g, h, 0);

+    else  /* all weak */

+      linkgclist(h, g->allweak);  /* nothing to traverse now */

+  }

+  else  /* not weak */

+    traversestrongtable(g, h);

+  return 1 + h->alimit + 2 * allocsizenode(h);

+}

+

+

+static int traverseudata (global_State *g, Udata *u) {

+  int i;

+  markobjectN(g, u->metatable);  /* mark its metatable */

+  for (i = 0; i < u->nuvalue; i++)

+    markvalue(g, &u->uv[i].uv);

+  genlink(g, obj2gco(u));

+  return 1 + u->nuvalue;

+}

+

+

+/*

+** Traverse a prototype. (While a prototype is being build, its

+** arrays can be larger than needed; the extra slots are filled with

+** NULL, so the use of 'markobjectN')

+*/

+static int traverseproto (global_State *g, Proto *f) {

+  int i;

+  markobjectN(g, f->source);

+  for (i = 0; i < f->sizek; i++)  /* mark literals */

+    markvalue(g, &f->k[i]);

+  for (i = 0; i < f->sizeupvalues; i++)  /* mark upvalue names */

+    markobjectN(g, f->upvalues[i].name);

+  for (i = 0; i < f->sizep; i++)  /* mark nested protos */

+    markobjectN(g, f->p[i]);

+  for (i = 0; i < f->sizelocvars; i++)  /* mark local-variable names */

+    markobjectN(g, f->locvars[i].varname);

+  return 1 + f->sizek + f->sizeupvalues + f->sizep + f->sizelocvars;

+}

+

+

+static int traverseCclosure (global_State *g, CClosure *cl) {

+  int i;

+  for (i = 0; i < cl->nupvalues; i++)  /* mark its upvalues */

+    markvalue(g, &cl->upvalue[i]);

+  return 1 + cl->nupvalues;

+}

+

+/*

+** Traverse a Lua closure, marking its prototype and its upvalues.

+** (Both can be NULL while closure is being created.)

+*/

+static int traverseLclosure (global_State *g, LClosure *cl) {

+  int i;

+  markobjectN(g, cl->p);  /* mark its prototype */

+  for (i = 0; i < cl->nupvalues; i++) {  /* visit its upvalues */

+    UpVal *uv = cl->upvals[i];

+    markobjectN(g, uv);  /* mark upvalue */

+  }

+  return 1 + cl->nupvalues;

+}

+

+

+/*

+** Traverse a thread, marking the elements in the stack up to its top

+** and cleaning the rest of the stack in the final traversal. That

+** ensures that the entire stack have valid (non-dead) objects.

+** Threads have no barriers. In gen. mode, old threads must be visited

+** at every cycle, because they might point to young objects.  In inc.

+** mode, the thread can still be modified before the end of the cycle,

+** and therefore it must be visited again in the atomic phase. To ensure

+** these visits, threads must return to a gray list if they are not new

+** (which can only happen in generational mode) or if the traverse is in

+** the propagate phase (which can only happen in incremental mode).

+*/

+static int traversethread (global_State *g, lua_State *th) {

+  UpVal *uv;

+  StkId o = th->stack;

+  if (isold(th) || g->gcstate == GCSpropagate)

+    linkgclist(th, g->grayagain);  /* insert into 'grayagain' list */

+  if (o == NULL)

+    return 1;  /* stack not completely built yet */

+  lua_assert(g->gcstate == GCSatomic ||

+             th->openupval == NULL || isintwups(th));

+  for (; o < th->top; o++)  /* mark live elements in the stack */

+    markvalue(g, s2v(o));

+  for (uv = th->openupval; uv != NULL; uv = uv->u.open.next)

+    markobject(g, uv);  /* open upvalues cannot be collected */

+  if (g->gcstate == GCSatomic) {  /* final traversal? */

+    for (; o < th->stack_last + EXTRA_STACK; o++)

+      setnilvalue(s2v(o));  /* clear dead stack slice */

+    /* 'remarkupvals' may have removed thread from 'twups' list */

+    if (!isintwups(th) && th->openupval != NULL) {

+      th->twups = g->twups;  /* link it back to the list */

+      g->twups = th;

+    }

+  }

+  else if (!g->gcemergency)

+    luaD_shrinkstack(th); /* do not change stack in emergency cycle */

+  return 1 + stacksize(th);

+}

+

+

+/*

+** traverse one gray object, turning it to black.

+*/

+static lu_mem propagatemark (global_State *g) {

+  GCObject *o = g->gray;

+  nw2black(o);

+  g->gray = *getgclist(o);  /* remove from 'gray' list */

+  switch (o->tt) {

+    case LUA_VTABLE: return traversetable(g, gco2t(o));

+    case LUA_VUSERDATA: return traverseudata(g, gco2u(o));

+    case LUA_VLCL: return traverseLclosure(g, gco2lcl(o));

+    case LUA_VCCL: return traverseCclosure(g, gco2ccl(o));

+    case LUA_VPROTO: return traverseproto(g, gco2p(o));

+    case LUA_VTHREAD: return traversethread(g, gco2th(o));

+    default: lua_assert(0); return 0;

+  }

+}

+

+

+static lu_mem propagateall (global_State *g) {

+  lu_mem tot = 0;

+  while (g->gray)

+    tot += propagatemark(g);

+  return tot;

+}

+

+

+/*

+** Traverse all ephemeron tables propagating marks from keys to values.

+** Repeat until it converges, that is, nothing new is marked. 'dir'

+** inverts the direction of the traversals, trying to speed up

+** convergence on chains in the same table.

+**

+*/

+static void convergeephemerons (global_State *g) {

+  int changed;

+  int dir = 0;

+  do {

+    GCObject *w;

+    GCObject *next = g->ephemeron;  /* get ephemeron list */

+    g->ephemeron = NULL;  /* tables may return to this list when traversed */

+    changed = 0;

+    while ((w = next) != NULL) {  /* for each ephemeron table */

+      Table *h = gco2t(w);

+      next = h->gclist;  /* list is rebuilt during loop */

+      nw2black(h);  /* out of the list (for now) */

+      if (traverseephemeron(g, h, dir)) {  /* marked some value? */

+        propagateall(g);  /* propagate changes */

+        changed = 1;  /* will have to revisit all ephemeron tables */

+      }

+    }

+    dir = !dir;  /* invert direction next time */

+  } while (changed);  /* repeat until no more changes */

+}

+

+/* }====================================================== */

+

+

+/*

+** {======================================================

+** Sweep Functions

+** =======================================================

+*/

+

+

+/*

+** clear entries with unmarked keys from all weaktables in list 'l'

+*/

+static void clearbykeys (global_State *g, GCObject *l) {

+  for (; l; l = gco2t(l)->gclist) {

+    Table *h = gco2t(l);

+    Node *limit = gnodelast(h);

+    Node *n;

+    for (n = gnode(h, 0); n < limit; n++) {

+      if (iscleared(g, gckeyN(n)))  /* unmarked key? */

+        setempty(gval(n));  /* remove entry */

+      if (isempty(gval(n)))  /* is entry empty? */

+        clearkey(n);  /* clear its key */

+    }

+  }

+}

+

+

+/*

+** clear entries with unmarked values from all weaktables in list 'l' up

+** to element 'f'

+*/

+static void clearbyvalues (global_State *g, GCObject *l, GCObject *f) {

+  for (; l != f; l = gco2t(l)->gclist) {

+    Table *h = gco2t(l);

+    Node *n, *limit = gnodelast(h);

+    unsigned int i;

+    unsigned int asize = luaH_realasize(h);

+    for (i = 0; i < asize; i++) {

+      TValue *o = &h->array[i];

+      if (iscleared(g, gcvalueN(o)))  /* value was collected? */

+        setempty(o);  /* remove entry */

+    }

+    for (n = gnode(h, 0); n < limit; n++) {

+      if (iscleared(g, gcvalueN(gval(n))))  /* unmarked value? */

+        setempty(gval(n));  /* remove entry */

+      if (isempty(gval(n)))  /* is entry empty? */

+        clearkey(n);  /* clear its key */

+    }

+  }

+}

+

+

+static void freeupval (lua_State *L, UpVal *uv) {

+  if (upisopen(uv))

+    luaF_unlinkupval(uv);

+  luaM_free(L, uv);

+}

+

+

+static void freeobj (lua_State *L, GCObject *o) {

+  switch (o->tt) {

+    case LUA_VPROTO:

+      luaF_freeproto(L, gco2p(o));

+      break;

+    case LUA_VUPVAL:

+      freeupval(L, gco2upv(o));

+      break;

+    case LUA_VLCL: {

+      LClosure *cl = gco2lcl(o);

+      luaM_freemem(L, cl, sizeLclosure(cl->nupvalues));

+      break;

+    }

+    case LUA_VCCL: {

+      CClosure *cl = gco2ccl(o);

+      luaM_freemem(L, cl, sizeCclosure(cl->nupvalues));

+      break;

+    }

+    case LUA_VTABLE:

+      luaH_free(L, gco2t(o));

+      break;

+    case LUA_VTHREAD:

+      luaE_freethread(L, gco2th(o));

+      break;

+    case LUA_VUSERDATA: {

+      Udata *u = gco2u(o);

+      luaM_freemem(L, o, sizeudata(u->nuvalue, u->len));

+      break;

+    }

+    case LUA_VSHRSTR: {

+      TString *ts = gco2ts(o);

+      luaS_remove(L, ts);  /* remove it from hash table */

+      luaM_freemem(L, ts, sizelstring(ts->shrlen));

+      break;

+    }

+    case LUA_VLNGSTR: {

+      TString *ts = gco2ts(o);

+      luaM_freemem(L, ts, sizelstring(ts->u.lnglen));

+      break;

+    }

+    default: lua_assert(0);

+  }

+}

+

+

+/*

+** sweep at most 'countin' elements from a list of GCObjects erasing dead

+** objects, where a dead object is one marked with the old (non current)

+** white; change all non-dead objects back to white, preparing for next

+** collection cycle. Return where to continue the traversal or NULL if

+** list is finished. ('*countout' gets the number of elements traversed.)

+*/

+static GCObject **sweeplist (lua_State *L, GCObject **p, int countin,

+                             int *countout) {

+  global_State *g = G(L);

+  int ow = otherwhite(g);

+  int i;

+  int white = luaC_white(g);  /* current white */

+  for (i = 0; *p != NULL && i < countin; i++) {

+    GCObject *curr = *p;

+    int marked = curr->marked;

+    if (isdeadm(ow, marked)) {  /* is 'curr' dead? */

+      *p = curr->next;  /* remove 'curr' from list */

+      freeobj(L, curr);  /* erase 'curr' */

+    }

+    else {  /* change mark to 'white' */

+      curr->marked = cast_byte((marked & ~maskgcbits) | white);

+      p = &curr->next;  /* go to next element */

+    }

+  }

+  if (countout)

+    *countout = i;  /* number of elements traversed */

+  return (*p == NULL) ? NULL : p;

+}

+

+

+/*

+** sweep a list until a live object (or end of list)

+*/

+static GCObject **sweeptolive (lua_State *L, GCObject **p) {

+  GCObject **old = p;

+  do {

+    p = sweeplist(L, p, 1, NULL);

+  } while (p == old);

+  return p;

+}

+

+/* }====================================================== */

+

+

+/*

+** {======================================================

+** Finalization

+** =======================================================

+*/

+

+/*

+** If possible, shrink string table.

+*/

+static void checkSizes (lua_State *L, global_State *g) {

+  if (!g->gcemergency) {

+    if (g->strt.nuse < g->strt.size / 4) {  /* string table too big? */

+      l_mem olddebt = g->GCdebt;

+      luaS_resize(L, g->strt.size / 2);

+      g->GCestimate += g->GCdebt - olddebt;  /* correct estimate */

+    }

+  }

+}

+

+

+/*

+** Get the next udata to be finalized from the 'tobefnz' list, and

+** link it back into the 'allgc' list.

+*/

+static GCObject *udata2finalize (global_State *g) {

+  GCObject *o = g->tobefnz;  /* get first element */

+  lua_assert(tofinalize(o));

+  g->tobefnz = o->next;  /* remove it from 'tobefnz' list */

+  o->next = g->allgc;  /* return it to 'allgc' list */

+  g->allgc = o;

+  resetbit(o->marked, FINALIZEDBIT);  /* object is "normal" again */

+  if (issweepphase(g))

+    makewhite(g, o);  /* "sweep" object */

+  else if (getage(o) == G_OLD1)

+    g->firstold1 = o;  /* it is the first OLD1 object in the list */

+  return o;

+}

+

+

+static void dothecall (lua_State *L, void *ud) {

+  UNUSED(ud);

+  luaD_callnoyield(L, L->top - 2, 0);

+}

+

+

+static void GCTM (lua_State *L) {

+  global_State *g = G(L);

+  const TValue *tm;

+  TValue v;

+  lua_assert(!g->gcemergency);

+  setgcovalue(L, &v, udata2finalize(g));

+  tm = luaT_gettmbyobj(L, &v, TM_GC);

+  if (!notm(tm)) {  /* is there a finalizer? */

+    int status;

+    lu_byte oldah = L->allowhook;

+    int running  = g->gcrunning;

+    L->allowhook = 0;  /* stop debug hooks during GC metamethod */

+    g->gcrunning = 0;  /* avoid GC steps */

+    setobj2s(L, L->top++, tm);  /* push finalizer... */

+    setobj2s(L, L->top++, &v);  /* ... and its argument */

+    L->ci->callstatus |= CIST_FIN;  /* will run a finalizer */

+    status = luaD_pcall(L, dothecall, NULL, savestack(L, L->top - 2), 0);

+    L->ci->callstatus &= ~CIST_FIN;  /* not running a finalizer anymore */

+    L->allowhook = oldah;  /* restore hooks */

+    g->gcrunning = running;  /* restore state */

+    if (unlikely(status != LUA_OK)) {  /* error while running __gc? */

+      luaE_warnerror(L, "__gc metamethod");

+      L->top--;  /* pops error object */

+    }

+  }

+}

+

+

+/*

+** Call a few finalizers

+*/

+static int runafewfinalizers (lua_State *L, int n) {

+  global_State *g = G(L);

+  int i;

+  for (i = 0; i < n && g->tobefnz; i++)

+    GCTM(L);  /* call one finalizer */

+  return i;

+}

+

+

+/*

+** call all pending finalizers

+*/

+static void callallpendingfinalizers (lua_State *L) {

+  global_State *g = G(L);

+  while (g->tobefnz)

+    GCTM(L);

+}

+

+

+/*

+** find last 'next' field in list 'p' list (to add elements in its end)

+*/

+static GCObject **findlast (GCObject **p) {

+  while (*p != NULL)

+    p = &(*p)->next;

+  return p;

+}

+

+

+/*

+** Move all unreachable objects (or 'all' objects) that need

+** finalization from list 'finobj' to list 'tobefnz' (to be finalized).

+** (Note that objects after 'finobjold1' cannot be white, so they

+** don't need to be traversed. In incremental mode, 'finobjold1' is NULL,

+** so the whole list is traversed.)

+*/

+static void separatetobefnz (global_State *g, int all) {

+  GCObject *curr;

+  GCObject **p = &g->finobj;

+  GCObject **lastnext = findlast(&g->tobefnz);

+  while ((curr = *p) != g->finobjold1) {  /* traverse all finalizable objects */

+    lua_assert(tofinalize(curr));

+    if (!(iswhite(curr) || all))  /* not being collected? */

+      p = &curr->next;  /* don't bother with it */

+    else {

+      if (curr == g->finobjsur)  /* removing 'finobjsur'? */

+        g->finobjsur = curr->next;  /* correct it */

+      *p = curr->next;  /* remove 'curr' from 'finobj' list */

+      curr->next = *lastnext;  /* link at the end of 'tobefnz' list */

+      *lastnext = curr;

+      lastnext = &curr->next;

+    }

+  }

+}

+

+

+/*

+** If pointer 'p' points to 'o', move it to the next element.

+*/

+static void checkpointer (GCObject **p, GCObject *o) {

+  if (o == *p)

+    *p = o->next;

+}

+

+

+/*

+** Correct pointers to objects inside 'allgc' list when

+** object 'o' is being removed from the list.

+*/

+static void correctpointers (global_State *g, GCObject *o) {

+  checkpointer(&g->survival, o);

+  checkpointer(&g->old1, o);

+  checkpointer(&g->reallyold, o);

+  checkpointer(&g->firstold1, o);

+}

+

+

+/*

+** if object 'o' has a finalizer, remove it from 'allgc' list (must

+** search the list to find it) and link it in 'finobj' list.

+*/

+void luaC_checkfinalizer (lua_State *L, GCObject *o, Table *mt) {

+  global_State *g = G(L);

+  if (tofinalize(o) ||                 /* obj. is already marked... */

+      gfasttm(g, mt, TM_GC) == NULL)   /* or has no finalizer? */

+    return;  /* nothing to be done */

+  else {  /* move 'o' to 'finobj' list */

+    GCObject **p;

+    if (issweepphase(g)) {

+      makewhite(g, o);  /* "sweep" object 'o' */

+      if (g->sweepgc == &o->next)  /* should not remove 'sweepgc' object */

+        g->sweepgc = sweeptolive(L, g->sweepgc);  /* change 'sweepgc' */

+    }

+    else

+      correctpointers(g, o);

+    /* search for pointer pointing to 'o' */

+    for (p = &g->allgc; *p != o; p = &(*p)->next) { /* empty */ }

+    *p = o->next;  /* remove 'o' from 'allgc' list */

+    o->next = g->finobj;  /* link it in 'finobj' list */

+    g->finobj = o;

+    l_setbit(o->marked, FINALIZEDBIT);  /* mark it as such */

+  }

+}

+

+/* }====================================================== */

+

+

+/*

+** {======================================================

+** Generational Collector

+** =======================================================

+*/

+

+static void setpause (global_State *g);

+

+

+/*

+** Sweep a list of objects to enter generational mode.  Deletes dead

+** objects and turns the non dead to old. All non-dead threads---which

+** are now old---must be in a gray list. Everything else is not in a

+** gray list. Open upvalues are also kept gray.

+*/

+static void sweep2old (lua_State *L, GCObject **p) {

+  GCObject *curr;

+  global_State *g = G(L);

+  while ((curr = *p) != NULL) {

+    if (iswhite(curr)) {  /* is 'curr' dead? */

+      lua_assert(isdead(g, curr));

+      *p = curr->next;  /* remove 'curr' from list */

+      freeobj(L, curr);  /* erase 'curr' */

+    }

+    else {  /* all surviving objects become old */

+      setage(curr, G_OLD);

+      if (curr->tt == LUA_VTHREAD) {  /* threads must be watched */

+        lua_State *th = gco2th(curr);

+        linkgclist(th, g->grayagain);  /* insert into 'grayagain' list */

+      }

+      else if (curr->tt == LUA_VUPVAL && upisopen(gco2upv(curr)))

+        set2gray(curr);  /* open upvalues are always gray */

+      else  /* everything else is black */

+        nw2black(curr);

+      p = &curr->next;  /* go to next element */

+    }

+  }

+}

+

+

+/*

+** Sweep for generational mode. Delete dead objects. (Because the

+** collection is not incremental, there are no "new white" objects

+** during the sweep. So, any white object must be dead.) For

+** non-dead objects, advance their ages and clear the color of

+** new objects. (Old objects keep their colors.)

+** The ages of G_TOUCHED1 and G_TOUCHED2 objects cannot be advanced

+** here, because these old-generation objects are usually not swept

+** here.  They will all be advanced in 'correctgraylist'. That function

+** will also remove objects turned white here from any gray list.

+*/

+static GCObject **sweepgen (lua_State *L, global_State *g, GCObject **p,

+                            GCObject *limit, GCObject **pfirstold1) {

+  static const lu_byte nextage[] = {

+    G_SURVIVAL,  /* from G_NEW */

+    G_OLD1,      /* from G_SURVIVAL */

+    G_OLD1,      /* from G_OLD0 */

+    G_OLD,       /* from G_OLD1 */

+    G_OLD,       /* from G_OLD (do not change) */

+    G_TOUCHED1,  /* from G_TOUCHED1 (do not change) */

+    G_TOUCHED2   /* from G_TOUCHED2 (do not change) */

+  };

+  int white = luaC_white(g);

+  GCObject *curr;

+  while ((curr = *p) != limit) {

+    if (iswhite(curr)) {  /* is 'curr' dead? */

+      lua_assert(!isold(curr) && isdead(g, curr));

+      *p = curr->next;  /* remove 'curr' from list */

+      freeobj(L, curr);  /* erase 'curr' */

+    }

+    else {  /* correct mark and age */

+      if (getage(curr) == G_NEW) {  /* new objects go back to white */

+        int marked = curr->marked & ~maskgcbits;  /* erase GC bits */

+        curr->marked = cast_byte(marked | G_SURVIVAL | white);

+      }

+      else {  /* all other objects will be old, and so keep their color */

+        setage(curr, nextage[getage(curr)]);

+        if (getage(curr) == G_OLD1 && *pfirstold1 == NULL)

+          *pfirstold1 = curr;  /* first OLD1 object in the list */

+      }

+      p = &curr->next;  /* go to next element */

+    }

+  }

+  return p;

+}

+

+

+/*

+** Traverse a list making all its elements white and clearing their

+** age. In incremental mode, all objects are 'new' all the time,

+** except for fixed strings (which are always old).

+*/

+static void whitelist (global_State *g, GCObject *p) {

+  int white = luaC_white(g);

+  for (; p != NULL; p = p->next)

+    p->marked = cast_byte((p->marked & ~maskgcbits) | white);

+}

+

+

+/*

+** Correct a list of gray objects. Return pointer to where rest of the

+** list should be linked.

+** Because this correction is done after sweeping, young objects might

+** be turned white and still be in the list. They are only removed.

+** 'TOUCHED1' objects are advanced to 'TOUCHED2' and remain on the list;

+** Non-white threads also remain on the list; 'TOUCHED2' objects become

+** regular old; they and anything else are removed from the list.

+*/

+static GCObject **correctgraylist (GCObject **p) {

+  GCObject *curr;

+  while ((curr = *p) != NULL) {

+    GCObject **next = getgclist(curr);

+    if (iswhite(curr))

+      goto remove;  /* remove all white objects */

+    else if (getage(curr) == G_TOUCHED1) {  /* touched in this cycle? */

+      lua_assert(isgray(curr));

+      nw2black(curr);  /* make it black, for next barrier */

+      changeage(curr, G_TOUCHED1, G_TOUCHED2);

+      goto remain;  /* keep it in the list and go to next element */

+    }

+    else if (curr->tt == LUA_VTHREAD) {

+      lua_assert(isgray(curr));

+      goto remain;  /* keep non-white threads on the list */

+    }

+    else {  /* everything else is removed */

+      lua_assert(isold(curr));  /* young objects should be white here */

+      if (getage(curr) == G_TOUCHED2)  /* advance from TOUCHED2... */

+        changeage(curr, G_TOUCHED2, G_OLD);  /* ... to OLD */

+      nw2black(curr);  /* make object black (to be removed) */

+      goto remove;

+    }

+    remove: *p = *next; continue;

+    remain: p = next; continue;

+  }

+  return p;

+}

+

+

+/*

+** Correct all gray lists, coalescing them into 'grayagain'.

+*/

+static void correctgraylists (global_State *g) {

+  GCObject **list = correctgraylist(&g->grayagain);

+  *list = g->weak; g->weak = NULL;

+  list = correctgraylist(list);

+  *list = g->allweak; g->allweak = NULL;

+  list = correctgraylist(list);

+  *list = g->ephemeron; g->ephemeron = NULL;

+  correctgraylist(list);

+}

+

+

+/*

+** Mark black 'OLD1' objects when starting a new young collection.

+** Gray objects are already in some gray list, and so will be visited

+** in the atomic step.

+*/

+static void markold (global_State *g, GCObject *from, GCObject *to) {

+  GCObject *p;

+  for (p = from; p != to; p = p->next) {

+    if (getage(p) == G_OLD1) {

+      lua_assert(!iswhite(p));

+      changeage(p, G_OLD1, G_OLD);  /* now they are old */

+      if (isblack(p))

+        reallymarkobject(g, p);

+    }

+  }

+}

+

+

+/*

+** Finish a young-generation collection.

+*/

+static void finishgencycle (lua_State *L, global_State *g) {

+  correctgraylists(g);

+  checkSizes(L, g);

+  g->gcstate = GCSpropagate;  /* skip restart */

+  if (!g->gcemergency)

+    callallpendingfinalizers(L);

+}

+

+

+/*

+** Does a young collection. First, mark 'OLD1' objects. Then does the

+** atomic step. Then, sweep all lists and advance pointers. Finally,

+** finish the collection.

+*/

+static void youngcollection (lua_State *L, global_State *g) {

+  GCObject **psurvival;  /* to point to first non-dead survival object */

+  GCObject *dummy;  /* dummy out parameter to 'sweepgen' */

+  lua_assert(g->gcstate == GCSpropagate);

+  if (g->firstold1) {  /* are there regular OLD1 objects? */

+    markold(g, g->firstold1, g->reallyold);  /* mark them */

+    g->firstold1 = NULL;  /* no more OLD1 objects (for now) */

+  }

+  markold(g, g->finobj, g->finobjrold);

+  markold(g, g->tobefnz, NULL);

+  atomic(L);

+

+  /* sweep nursery and get a pointer to its last live element */

+  g->gcstate = GCSswpallgc;

+  psurvival = sweepgen(L, g, &g->allgc, g->survival, &g->firstold1);

+  /* sweep 'survival' */

+  sweepgen(L, g, psurvival, g->old1, &g->firstold1);

+  g->reallyold = g->old1;

+  g->old1 = *psurvival;  /* 'survival' survivals are old now */

+  g->survival = g->allgc;  /* all news are survivals */

+

+  /* repeat for 'finobj' lists */

+  dummy = NULL;  /* no 'firstold1' optimization for 'finobj' lists */

+  psurvival = sweepgen(L, g, &g->finobj, g->finobjsur, &dummy);

+  /* sweep 'survival' */

+  sweepgen(L, g, psurvival, g->finobjold1, &dummy);

+  g->finobjrold = g->finobjold1;

+  g->finobjold1 = *psurvival;  /* 'survival' survivals are old now */

+  g->finobjsur = g->finobj;  /* all news are survivals */

+

+  sweepgen(L, g, &g->tobefnz, NULL, &dummy);

+  finishgencycle(L, g);

+}

+

+

+/*

+** Clears all gray lists, sweeps objects, and prepare sublists to enter

+** generational mode. The sweeps remove dead objects and turn all

+** surviving objects to old. Threads go back to 'grayagain'; everything

+** else is turned black (not in any gray list).

+*/

+static void atomic2gen (lua_State *L, global_State *g) {

+  cleargraylists(g);

+  /* sweep all elements making them old */

+  g->gcstate = GCSswpallgc;

+  sweep2old(L, &g->allgc);

+  /* everything alive now is old */

+  g->reallyold = g->old1 = g->survival = g->allgc;

+  g->firstold1 = NULL;  /* there are no OLD1 objects anywhere */

+

+  /* repeat for 'finobj' lists */

+  sweep2old(L, &g->finobj);

+  g->finobjrold = g->finobjold1 = g->finobjsur = g->finobj;

+

+  sweep2old(L, &g->tobefnz);

+

+  g->gckind = KGC_GEN;

+  g->lastatomic = 0;

+  g->GCestimate = gettotalbytes(g);  /* base for memory control */

+  finishgencycle(L, g);

+}

+

+

+/*

+** Enter generational mode. Must go until the end of an atomic cycle

+** to ensure that all objects are correctly marked and weak tables

+** are cleared. Then, turn all objects into old and finishes the

+** collection.

+*/

+static lu_mem entergen (lua_State *L, global_State *g) {

+  lu_mem numobjs;

+  luaC_runtilstate(L, bitmask(GCSpause));  /* prepare to start a new cycle */

+  luaC_runtilstate(L, bitmask(GCSpropagate));  /* start new cycle */

+  numobjs = atomic(L);  /* propagates all and then do the atomic stuff */

+  atomic2gen(L, g);

+  return numobjs;

+}

+

+

+/*

+** Enter incremental mode. Turn all objects white, make all

+** intermediate lists point to NULL (to avoid invalid pointers),

+** and go to the pause state.

+*/

+static void enterinc (global_State *g) {

+  whitelist(g, g->allgc);

+  g->reallyold = g->old1 = g->survival = NULL;

+  whitelist(g, g->finobj);

+  whitelist(g, g->tobefnz);

+  g->finobjrold = g->finobjold1 = g->finobjsur = NULL;

+  g->gcstate = GCSpause;

+  g->gckind = KGC_INC;

+  g->lastatomic = 0;

+}

+

+

+/*

+** Change collector mode to 'newmode'.

+*/

+void luaC_changemode (lua_State *L, int newmode) {

+  global_State *g = G(L);

+  if (newmode != g->gckind) {

+    if (newmode == KGC_GEN)  /* entering generational mode? */

+      entergen(L, g);

+    else

+      enterinc(g);  /* entering incremental mode */

+  }

+  g->lastatomic = 0;

+}

+

+

+/*

+** Does a full collection in generational mode.

+*/

+static lu_mem fullgen (lua_State *L, global_State *g) {

+  enterinc(g);

+  return entergen(L, g);

+}

+

+

+/*

+** Set debt for the next minor collection, which will happen when

+** memory grows 'genminormul'%.

+*/

+static void setminordebt (global_State *g) {

+  luaE_setdebt(g, -(cast(l_mem, (gettotalbytes(g) / 100)) * g->genminormul));

+}

+

+

+/*

+** Does a major collection after last collection was a "bad collection".

+**

+** When the program is building a big structure, it allocates lots of

+** memory but generates very little garbage. In those scenarios,

+** the generational mode just wastes time doing small collections, and

+** major collections are frequently what we call a "bad collection", a

+** collection that frees too few objects. To avoid the cost of switching

+** between generational mode and the incremental mode needed for full

+** (major) collections, the collector tries to stay in incremental mode

+** after a bad collection, and to switch back to generational mode only

+** after a "good" collection (one that traverses less than 9/8 objects

+** of the previous one).

+** The collector must choose whether to stay in incremental mode or to

+** switch back to generational mode before sweeping. At this point, it

+** does not know the real memory in use, so it cannot use memory to

+** decide whether to return to generational mode. Instead, it uses the

+** number of objects traversed (returned by 'atomic') as a proxy. The

+** field 'g->lastatomic' keeps this count from the last collection.

+** ('g->lastatomic != 0' also means that the last collection was bad.)

+*/

+static void stepgenfull (lua_State *L, global_State *g) {

+  lu_mem newatomic;  /* count of traversed objects */

+  lu_mem lastatomic = g->lastatomic;  /* count from last collection */

+  if (g->gckind == KGC_GEN)  /* still in generational mode? */

+    enterinc(g);  /* enter incremental mode */

+  luaC_runtilstate(L, bitmask(GCSpropagate));  /* start new cycle */

+  newatomic = atomic(L);  /* mark everybody */

+  if (newatomic < lastatomic + (lastatomic >> 3)) {  /* good collection? */

+    atomic2gen(L, g);  /* return to generational mode */

+    setminordebt(g);

+  }

+  else {  /* another bad collection; stay in incremental mode */

+    g->GCestimate = gettotalbytes(g);  /* first estimate */;

+    entersweep(L);

+    luaC_runtilstate(L, bitmask(GCSpause));  /* finish collection */

+    setpause(g);

+    g->lastatomic = newatomic;

+  }

+}

+

+

+/*

+** Does a generational "step".

+** Usually, this means doing a minor collection and setting the debt to

+** make another collection when memory grows 'genminormul'% larger.

+**

+** However, there are exceptions.  If memory grows 'genmajormul'%

+** larger than it was at the end of the last major collection (kept

+** in 'g->GCestimate'), the function does a major collection. At the

+** end, it checks whether the major collection was able to free a

+** decent amount of memory (at least half the growth in memory since

+** previous major collection). If so, the collector keeps its state,

+** and the next collection will probably be minor again. Otherwise,

+** we have what we call a "bad collection". In that case, set the field

+** 'g->lastatomic' to signal that fact, so that the next collection will

+** go to 'stepgenfull'.

+**

+** 'GCdebt <= 0' means an explicit call to GC step with "size" zero;

+** in that case, do a minor collection.

+*/

+static void genstep (lua_State *L, global_State *g) {

+  if (g->lastatomic != 0)  /* last collection was a bad one? */

+    stepgenfull(L, g);  /* do a full step */

+  else {

+    lu_mem majorbase = g->GCestimate;  /* memory after last major collection */

+    lu_mem majorinc = (majorbase / 100) * getgcparam(g->genmajormul);

+    if (g->GCdebt > 0 && gettotalbytes(g) > majorbase + majorinc) {

+      lu_mem numobjs = fullgen(L, g);  /* do a major collection */

+      if (gettotalbytes(g) < majorbase + (majorinc / 2)) {

+        /* collected at least half of memory growth since last major

+           collection; keep doing minor collections */

+        setminordebt(g);

+      }

+      else {  /* bad collection */

+        g->lastatomic = numobjs;  /* signal that last collection was bad */

+        setpause(g);  /* do a long wait for next (major) collection */

+      }

+    }

+    else {  /* regular case; do a minor collection */

+      youngcollection(L, g);

+      setminordebt(g);

+      g->GCestimate = majorbase;  /* preserve base value */

+    }

+  }

+  lua_assert(isdecGCmodegen(g));

+}

+

+/* }====================================================== */

+

+

+/*

+** {======================================================

+** GC control

+** =======================================================

+*/

+

+

+/*

+** Set the "time" to wait before starting a new GC cycle; cycle will

+** start when memory use hits the threshold of ('estimate' * pause /

+** PAUSEADJ). (Division by 'estimate' should be OK: it cannot be zero,

+** because Lua cannot even start with less than PAUSEADJ bytes).

+*/

+static void setpause (global_State *g) {

+  l_mem threshold, debt;

+  int pause = getgcparam(g->gcpause);

+  l_mem estimate = g->GCestimate / PAUSEADJ;  /* adjust 'estimate' */

+  lua_assert(estimate > 0);

+  threshold = (pause < MAX_LMEM / estimate)  /* overflow? */

+            ? estimate * pause  /* no overflow */

+            : MAX_LMEM;  /* overflow; truncate to maximum */

+  debt = gettotalbytes(g) - threshold;

+  if (debt > 0) debt = 0;

+  luaE_setdebt(g, debt);

+}

+

+

+/*

+** Enter first sweep phase.

+** The call to 'sweeptolive' makes the pointer point to an object

+** inside the list (instead of to the header), so that the real sweep do

+** not need to skip objects created between "now" and the start of the

+** real sweep.

+*/

+static void entersweep (lua_State *L) {

+  global_State *g = G(L);

+  g->gcstate = GCSswpallgc;

+  lua_assert(g->sweepgc == NULL);

+  g->sweepgc = sweeptolive(L, &g->allgc);

+}

+

+

+/*

+** Delete all objects in list 'p' until (but not including) object

+** 'limit'.

+*/

+static void deletelist (lua_State *L, GCObject *p, GCObject *limit) {

+  while (p != limit) {

+    GCObject *next = p->next;

+    freeobj(L, p);

+    p = next;

+  }

+}

+

+

+/*

+** Call all finalizers of the objects in the given Lua state, and

+** then free all objects, except for the main thread.

+*/

+void luaC_freeallobjects (lua_State *L) {

+  global_State *g = G(L);

+  luaC_changemode(L, KGC_INC);

+  separatetobefnz(g, 1);  /* separate all objects with finalizers */

+  lua_assert(g->finobj == NULL);

+  callallpendingfinalizers(L);

+  deletelist(L, g->allgc, obj2gco(g->mainthread));

+  deletelist(L, g->finobj, NULL);

+  deletelist(L, g->fixedgc, NULL);  /* collect fixed objects */

+  lua_assert(g->strt.nuse == 0);

+}

+

+

+static lu_mem atomic (lua_State *L) {

+  global_State *g = G(L);

+  lu_mem work = 0;

+  GCObject *origweak, *origall;

+  GCObject *grayagain = g->grayagain;  /* save original list */

+  g->grayagain = NULL;

+  lua_assert(g->ephemeron == NULL && g->weak == NULL);

+  lua_assert(!iswhite(g->mainthread));

+  g->gcstate = GCSatomic;

+  markobject(g, L);  /* mark running thread */

+  /* registry and global metatables may be changed by API */

+  markvalue(g, &g->l_registry);

+  markmt(g);  /* mark global metatables */

+  work += propagateall(g);  /* empties 'gray' list */

+  /* remark occasional upvalues of (maybe) dead threads */

+  work += remarkupvals(g);

+  work += propagateall(g);  /* propagate changes */

+  g->gray = grayagain;

+  work += propagateall(g);  /* traverse 'grayagain' list */

+  convergeephemerons(g);

+  /* at this point, all strongly accessible objects are marked. */

+  /* Clear values from weak tables, before checking finalizers */

+  clearbyvalues(g, g->weak, NULL);

+  clearbyvalues(g, g->allweak, NULL);

+  origweak = g->weak; origall = g->allweak;

+  separatetobefnz(g, 0);  /* separate objects to be finalized */

+  work += markbeingfnz(g);  /* mark objects that will be finalized */

+  work += propagateall(g);  /* remark, to propagate 'resurrection' */

+  convergeephemerons(g);

+  /* at this point, all resurrected objects are marked. */

+  /* remove dead objects from weak tables */

+  clearbykeys(g, g->ephemeron);  /* clear keys from all ephemeron tables */

+  clearbykeys(g, g->allweak);  /* clear keys from all 'allweak' tables */

+  /* clear values from resurrected weak tables */

+  clearbyvalues(g, g->weak, origweak);

+  clearbyvalues(g, g->allweak, origall);

+  luaS_clearcache(g);

+  g->currentwhite = cast_byte(otherwhite(g));  /* flip current white */

+  lua_assert(g->gray == NULL);

+  return work;  /* estimate of slots marked by 'atomic' */

+}

+

+

+static int sweepstep (lua_State *L, global_State *g,

+                      int nextstate, GCObject **nextlist) {

+  if (g->sweepgc) {

+    l_mem olddebt = g->GCdebt;

+    int count;

+    g->sweepgc = sweeplist(L, g->sweepgc, GCSWEEPMAX, &count);

+    g->GCestimate += g->GCdebt - olddebt;  /* update estimate */

+    return count;

+  }

+  else {  /* enter next state */

+    g->gcstate = nextstate;

+    g->sweepgc = nextlist;

+    return 0;  /* no work done */

+  }

+}

+

+

+static lu_mem singlestep (lua_State *L) {

+  global_State *g = G(L);

+  switch (g->gcstate) {

+    case GCSpause: {

+      restartcollection(g);

+      g->gcstate = GCSpropagate;

+      return 1;

+    }

+    case GCSpropagate: {

+      if (g->gray == NULL) {  /* no more gray objects? */

+        g->gcstate = GCSenteratomic;  /* finish propagate phase */

+        return 0;

+      }

+      else

+        return propagatemark(g);  /* traverse one gray object */

+    }

+    case GCSenteratomic: {

+      lu_mem work = atomic(L);  /* work is what was traversed by 'atomic' */

+      entersweep(L);

+      g->GCestimate = gettotalbytes(g);  /* first estimate */;

+      return work;

+    }

+    case GCSswpallgc: {  /* sweep "regular" objects */

+      return sweepstep(L, g, GCSswpfinobj, &g->finobj);

+    }

+    case GCSswpfinobj: {  /* sweep objects with finalizers */

+      return sweepstep(L, g, GCSswptobefnz, &g->tobefnz);

+    }

+    case GCSswptobefnz: {  /* sweep objects to be finalized */

+      return sweepstep(L, g, GCSswpend, NULL);

+    }

+    case GCSswpend: {  /* finish sweeps */

+      checkSizes(L, g);

+      g->gcstate = GCScallfin;

+      return 0;

+    }

+    case GCScallfin: {  /* call remaining finalizers */

+      if (g->tobefnz && !g->gcemergency) {

+        int n = runafewfinalizers(L, GCFINMAX);

+        return n * GCFINALIZECOST;

+      }

+      else {  /* emergency mode or no more finalizers */

+        g->gcstate = GCSpause;  /* finish collection */

+        return 0;

+      }

+    }

+    default: lua_assert(0); return 0;

+  }

+}

+

+

+/*

+** advances the garbage collector until it reaches a state allowed

+** by 'statemask'

+*/

+void luaC_runtilstate (lua_State *L, int statesmask) {

+  global_State *g = G(L);

+  while (!testbit(statesmask, g->gcstate))

+    singlestep(L);

+}

+

+

+/*

+** Performs a basic incremental step. The debt and step size are

+** converted from bytes to "units of work"; then the function loops

+** running single steps until adding that many units of work or

+** finishing a cycle (pause state). Finally, it sets the debt that

+** controls when next step will be performed.

+*/

+static void incstep (lua_State *L, global_State *g) {

+  int stepmul = (getgcparam(g->gcstepmul) | 1);  /* avoid division by 0 */

+  l_mem debt = (g->GCdebt / WORK2MEM) * stepmul;

+  l_mem stepsize = (g->gcstepsize <= log2maxs(l_mem))

+                 ? ((cast(l_mem, 1) << g->gcstepsize) / WORK2MEM) * stepmul

+                 : MAX_LMEM;  /* overflow; keep maximum value */

+  do {  /* repeat until pause or enough "credit" (negative debt) */

+    lu_mem work = singlestep(L);  /* perform one single step */

+    debt -= work;

+  } while (debt > -stepsize && g->gcstate != GCSpause);

+  if (g->gcstate == GCSpause)

+    setpause(g);  /* pause until next cycle */

+  else {

+    debt = (debt / stepmul) * WORK2MEM;  /* convert 'work units' to bytes */

+    luaE_setdebt(g, debt);

+  }

+}

+

+/*

+** performs a basic GC step if collector is running

+*/

+void luaC_step (lua_State *L) {

+  global_State *g = G(L);

+  lua_assert(!g->gcemergency);

+  if (g->gcrunning) {  /* running? */

+    if(isdecGCmodegen(g))

+      genstep(L, g);

+    else

+      incstep(L, g);

+  }

+}

+

+

+/*

+** Perform a full collection in incremental mode.

+** Before running the collection, check 'keepinvariant'; if it is true,

+** there may be some objects marked as black, so the collector has

+** to sweep all objects to turn them back to white (as white has not

+** changed, nothing will be collected).

+*/

+static void fullinc (lua_State *L, global_State *g) {

+  if (keepinvariant(g))  /* black objects? */

+    entersweep(L); /* sweep everything to turn them back to white */

+  /* finish any pending sweep phase to start a new cycle */

+  luaC_runtilstate(L, bitmask(GCSpause));

+  luaC_runtilstate(L, bitmask(GCScallfin));  /* run up to finalizers */

+  /* estimate must be correct after a full GC cycle */

+  lua_assert(g->GCestimate == gettotalbytes(g));

+  luaC_runtilstate(L, bitmask(GCSpause));  /* finish collection */

+  setpause(g);

+}

+

+

+/*

+** Performs a full GC cycle; if 'isemergency', set a flag to avoid

+** some operations which could change the interpreter state in some

+** unexpected ways (running finalizers and shrinking some structures).

+*/

+void luaC_fullgc (lua_State *L, int isemergency) {

+  global_State *g = G(L);

+  lua_assert(!g->gcemergency);

+  g->gcemergency = isemergency;  /* set flag */

+  if (g->gckind == KGC_INC)

+    fullinc(L, g);

+  else

+    fullgen(L, g);

+  g->gcemergency = 0;

+}

+

+/* }====================================================== */

+

+

--- /dev/null

+++ b/lgc.h

@@ -1,0 +1,189 @@

+/*

+** $Id: lgc.h $

+** Garbage Collector

+** See Copyright Notice in lua.h

+*/

+

+#ifndef lgc_h

+#define lgc_h

+

+

+#include "lobject.h"

+#include "lstate.h"

+

+/*

+** Collectable objects may have one of three colors: white, which means

+** the object is not marked; gray, which means the object is marked, but

+** its references may be not marked; and black, which means that the

+** object and all its references are marked.  The main invariant of the

+** garbage collector, while marking objects, is that a black object can

+** never point to a white one. Moreover, any gray object must be in a

+** "gray list" (gray, grayagain, weak, allweak, ephemeron) so that it

+** can be visited again before finishing the collection cycle. (Open

+** upvalues are an exception to this rule.)  These lists have no meaning

+** when the invariant is not being enforced (e.g., sweep phase).

+*/

+

+

+/*

+** Possible states of the Garbage Collector

+*/

+#define GCSpropagate	0

+#define GCSenteratomic	1

+#define GCSatomic	2

+#define GCSswpallgc	3

+#define GCSswpfinobj	4

+#define GCSswptobefnz	5

+#define GCSswpend	6

+#define GCScallfin	7

+#define GCSpause	8

+

+

+#define issweepphase(g)  \

+	(GCSswpallgc <= (g)->gcstate && (g)->gcstate <= GCSswpend)

+

+

+/*

+** macro to tell when main invariant (white objects cannot point to black

+** ones) must be kept. During a collection, the sweep

+** phase may break the invariant, as objects turned white may point to

+** still-black objects. The invariant is restored when sweep ends and

+** all objects are white again.

+*/

+

+#define keepinvariant(g)	((g)->gcstate <= GCSatomic)

+

+

+/*

+** some useful bit tricks

+*/

+#define resetbits(x,m)		((x) &= cast_byte(~(m)))

+#define setbits(x,m)		((x) |= (m))

+#define testbits(x,m)		((x) & (m))

+#define bitmask(b)		(1<<(b))

+#define bit2mask(b1,b2)		(bitmask(b1) | bitmask(b2))

+#define l_setbit(x,b)		setbits(x, bitmask(b))

+#define resetbit(x,b)		resetbits(x, bitmask(b))

+#define testbit(x,b)		testbits(x, bitmask(b))

+

+

+/*

+** Layout for bit use in 'marked' field. First three bits are

+** used for object "age" in generational mode. Last bit is used

+** by tests.

+*/

+#define WHITE0BIT	3  /* object is white (type 0) */

+#define WHITE1BIT	4  /* object is white (type 1) */

+#define BLACKBIT	5  /* object is black */

+#define FINALIZEDBIT	6  /* object has been marked for finalization */

+

+#define TESTBIT		7

+

+

+

+#define WHITEBITS	bit2mask(WHITE0BIT, WHITE1BIT)

+

+

+#define iswhite(x)      testbits((x)->marked, WHITEBITS)

+#define isblack(x)      testbit((x)->marked, BLACKBIT)

+#define isgray(x)  /* neither white nor black */  \

+	(!testbits((x)->marked, WHITEBITS | bitmask(BLACKBIT)))

+

+#define tofinalize(x)	testbit((x)->marked, FINALIZEDBIT)

+

+#define otherwhite(g)	((g)->currentwhite ^ WHITEBITS)

+#define isdeadm(ow,m)	((m) & (ow))

+#define isdead(g,v)	isdeadm(otherwhite(g), (v)->marked)

+

+#define changewhite(x)	((x)->marked ^= WHITEBITS)

+#define nw2black(x)  \

+	check_exp(!iswhite(x), l_setbit((x)->marked, BLACKBIT))

+

+#define luaC_white(g)	cast_byte((g)->currentwhite & WHITEBITS)

+

+

+/* object age in generational mode */

+#define G_NEW		0	/* created in current cycle */

+#define G_SURVIVAL	1	/* created in previous cycle */

+#define G_OLD0		2	/* marked old by frw. barrier in this cycle */

+#define G_OLD1		3	/* first full cycle as old */

+#define G_OLD		4	/* really old object (not to be visited) */

+#define G_TOUCHED1	5	/* old object touched this cycle */

+#define G_TOUCHED2	6	/* old object touched in previous cycle */

+

+#define AGEBITS		7  /* all age bits (111) */

+

+#define getage(o)	((o)->marked & AGEBITS)

+#define setage(o,a)  ((o)->marked = cast_byte(((o)->marked & (~AGEBITS)) | a))

+#define isold(o)	(getage(o) > G_SURVIVAL)

+

+#define changeage(o,f,t)  \

+	check_exp(getage(o) == (f), (o)->marked ^= ((f)^(t)))

+

+

+/* Default Values for GC parameters */

+#define LUAI_GENMAJORMUL         100

+#define LUAI_GENMINORMUL         20

+

+/* wait memory to double before starting new cycle */

+#define LUAI_GCPAUSE    200

+

+/*

+** some gc parameters are stored divided by 4 to allow a maximum value

+** up to 1023 in a 'lu_byte'.

+*/

+#define getgcparam(p)	((p) * 4)

+#define setgcparam(p,v)	((p) = (v) / 4)

+

+#define LUAI_GCMUL      100

+

+/* how much to allocate before next GC step (log2) */

+#define LUAI_GCSTEPSIZE 13      /* 8 KB */

+

+

+/*

+** Check whether the declared GC mode is generational. While in

+** generational mode, the collector can go temporarily to incremental

+** mode to improve performance. This is signaled by 'g->lastatomic != 0'.

+*/

+#define isdecGCmodegen(g)	(g->gckind == KGC_GEN || g->lastatomic != 0)

+

+/*

+** Does one step of collection when debt becomes positive. 'pre'/'pos'

+** allows some adjustments to be done only when needed. macro

+** 'condchangemem' is used only for heavy tests (forcing a full

+** GC cycle on every opportunity)

+*/

+#define luaC_condGC(L,pre,pos) \

+	{ if (G(L)->GCdebt > 0) { pre; luaC_step(L); pos;}; \

+	  condchangemem(L,pre,pos); }

+

+/* more often than not, 'pre'/'pos' are empty */

+#define luaC_checkGC(L)		luaC_condGC(L,(void)0,(void)0)

+

+

+#define luaC_barrier(L,p,v) (  \

+	(iscollectable(v) && isblack(p) && iswhite(gcvalue(v))) ?  \

+	luaC_barrier_(L,obj2gco(p),gcvalue(v)) : cast_void(0))

+

+#define luaC_barrierback(L,p,v) (  \

+	(iscollectable(v) && isblack(p) && iswhite(gcvalue(v))) ? \

+	luaC_barrierback_(L,p) : cast_void(0))

+

+#define luaC_objbarrier(L,p,o) (  \

+	(isblack(p) && iswhite(o)) ? \

+	luaC_barrier_(L,obj2gco(p),obj2gco(o)) : cast_void(0))

+

+LUAI_FUNC void luaC_fix (lua_State *L, GCObject *o);

+LUAI_FUNC void luaC_freeallobjects (lua_State *L);

+LUAI_FUNC void luaC_step (lua_State *L);

+LUAI_FUNC void luaC_runtilstate (lua_State *L, int statesmask);

+LUAI_FUNC void luaC_fullgc (lua_State *L, int isemergency);

+LUAI_FUNC GCObject *luaC_newobj (lua_State *L, int tt, size_t sz);

+LUAI_FUNC void luaC_barrier_ (lua_State *L, GCObject *o, GCObject *v);

+LUAI_FUNC void luaC_barrierback_ (lua_State *L, GCObject *o);

+LUAI_FUNC void luaC_checkfinalizer (lua_State *L, GCObject *o, Table *mt);

+LUAI_FUNC void luaC_changemode (lua_State *L, int newmode);

+

+

+#endif

--- /dev/null

+++ b/linit.c

@@ -1,0 +1,65 @@

+/*

+** $Id: linit.c $

+** Initialization of libraries for lua.c and other clients

+** See Copyright Notice in lua.h

+*/

+

+

+#define linit_c

+#define LUA_LIB

+

+/*

+** If you embed Lua in your program and need to open the standard

+** libraries, call luaL_openlibs in your program. If you need a

+** different set of libraries, copy this file to your project and edit

+** it to suit your needs.

+**

+** You can also *preload* libraries, so that a later 'require' can

+** open the library, which is already linked to the application.

+** For that, do the following code:

+**

+**  luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE);

+**  lua_pushcfunction(L, luaopen_modname);

+**  lua_setfield(L, -2, modname);

+**  lua_pop(L, 1);  // remove PRELOAD table

+*/

+

+#include "lprefix.h"

+

+

+#include <stddef.h>

+

+#include "lua.h"

+

+#include "lualib.h"

+#include "lauxlib.h"

+

+

+/*

+** these libs are loaded by lua.c and are readily available to any Lua

+** program

+*/

+static const luaL_Reg loadedlibs[] = {

+  {LUA_GNAME, luaopen_base},

+  {LUA_LOADLIBNAME, luaopen_package},

+  {LUA_COLIBNAME, luaopen_coroutine},

+  {LUA_TABLIBNAME, luaopen_table},

+  {LUA_IOLIBNAME, luaopen_io},

+  {LUA_OSLIBNAME, luaopen_os},

+  {LUA_STRLIBNAME, luaopen_string},

+  {LUA_MATHLIBNAME, luaopen_math},

+  {LUA_UTF8LIBNAME, luaopen_utf8},

+  {LUA_DBLIBNAME, luaopen_debug},

+  {NULL, NULL}

+};

+

+

+LUALIB_API void luaL_openlibs (lua_State *L) {

+  const luaL_Reg *lib;

+  /* "require" functions from 'loadedlibs' and set results to global table */

+  for (lib = loadedlibs; lib->func; lib++) {

+    luaL_requiref(L, lib->name, lib->func, 1);

+    lua_pop(L, 1);  /* remove lib */

+  }

+}

+

--- /dev/null

+++ b/liolib.c

@@ -1,0 +1,821 @@

+/*

+** $Id: liolib.c $

+** Standard I/O (and system) library

+** See Copyright Notice in lua.h

+*/

+

+#define liolib_c

+#define LUA_LIB

+

+#include "lprefix.h"

+

+

+#include <ctype.h>

+#include <errno.h>

+#include <locale.h>

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "lauxlib.h"

+#include "lualib.h"

+

+

+

+

+/*

+** Change this macro to accept other modes for 'fopen' besides

+** the standard ones.

+*/

+#if !defined(l_checkmode)

+

+/* accepted extensions to 'mode' in 'fopen' */

+#if !defined(L_MODEEXT)

+#define L_MODEEXT	"b"

+#endif

+

+/* Check whether 'mode' matches '[rwa]%+?[L_MODEEXT]*' */

+static int l_checkmode (const char *mode) {

+  return (*mode != '\0' && strchr("rwa", *(mode++)) != NULL &&

+         (*mode != '+' || ((void)(++mode), 1)) &&  /* skip if char is '+' */

+         (strspn(mode, L_MODEEXT) == strlen(mode)));  /* check extensions */

+}

+

+#endif

+

+/*

+** {======================================================

+** l_popen spawns a new process connected to the current

+** one through the file streams.

+** =======================================================

+*/

+

+#if !defined(l_checkmodep)

+/* By default, Lua accepts only "r" or "w" as mode */

+#define l_checkmodep(m)	((m[0] == 'r' || m[0] == 'w') && m[1] == '\0')

+#endif

+

+

+#if !defined(l_popen)		/* { */

+

+#if defined(LUA_USE_POSIX)	/* { */

+

+#define l_popen(L,c,m)		(fflush(NULL), popen(c,m))

+#define l_pclose(L,file)	(pclose(file))

+

+#elif defined(LUA_USE_WINDOWS)	/* }{ */

+

+#define l_popen(L,c,m)		(_popen(c,m))

+#define l_pclose(L,file)	(_pclose(file))

+

+#else				/* }{ */

+

+/* ISO C definitions */

+#define l_popen(L,c,m)  \

+	  ((void)c, (void)m, \

+	  luaL_error(L, "'popen' not supported"), \

+	  (FILE*)0)

+#define l_pclose(L,file)		((void)L, (void)file, -1)

+

+#endif				/* } */

+

+#endif				/* } */

+

+/* }====================================================== */

+

+

+#if !defined(l_getc)		/* { */

+

+#if defined(LUA_USE_POSIX)

+#define l_getc(f)		getc_unlocked(f)

+#define l_lockfile(f)		flockfile(f)

+#define l_unlockfile(f)		funlockfile(f)

+#else

+#define l_getc(f)		getc(f)

+#define l_lockfile(f)		((void)0)

+#define l_unlockfile(f)		((void)0)

+#endif

+

+#endif				/* } */

+

+

+/*

+** {======================================================

+** l_fseek: configuration for longer offsets

+** =======================================================

+*/

+

+#if !defined(l_fseek)		/* { */

+

+#if defined(LUA_USE_POSIX)	/* { */

+

+#include <sys/types.h>

+

+#define l_fseek(f,o,w)		fseeko(f,o,w)

+#define l_ftell(f)		ftello(f)

+#define l_seeknum		off_t

+

+#elif defined(LUA_USE_WINDOWS) && !defined(_CRTIMP_TYPEINFO) \

+   && defined(_MSC_VER) && (_MSC_VER >= 1400)	/* }{ */

+

+/* Windows (but not DDK) and Visual C++ 2005 or higher */

+#define l_fseek(f,o,w)		_fseeki64(f,o,w)

+#define l_ftell(f)		_ftelli64(f)

+#define l_seeknum		__int64

+

+#else				/* }{ */

+

+/* ISO C definitions */

+#define l_fseek(f,o,w)		fseek(f,o,w)

+#define l_ftell(f)		ftell(f)

+#define l_seeknum		long

+

+#endif				/* } */

+

+#endif				/* } */

+

+/* }====================================================== */

+

+

+

+#define IO_PREFIX	"_IO_"

+#define IOPREF_LEN	(sizeof(IO_PREFIX)/sizeof(char) - 1)

+#define IO_INPUT	(IO_PREFIX "input")

+#define IO_OUTPUT	(IO_PREFIX "output")

+

+

+typedef luaL_Stream LStream;

+

+

+#define tolstream(L)	((LStream *)luaL_checkudata(L, 1, LUA_FILEHANDLE))

+

+#define isclosed(p)	((p)->closef == NULL)

+

+

+static int io_type (lua_State *L) {

+  LStream *p;

+  luaL_checkany(L, 1);

+  p = (LStream *)luaL_testudata(L, 1, LUA_FILEHANDLE);

+  if (p == NULL)

+    luaL_pushfail(L);  /* not a file */

+  else if (isclosed(p))

+    lua_pushliteral(L, "closed file");

+  else

+    lua_pushliteral(L, "file");

+  return 1;

+}

+

+

+static int f_tostring (lua_State *L) {

+  LStream *p = tolstream(L);

+  if (isclosed(p))

+    lua_pushliteral(L, "file (closed)");

+  else

+    lua_pushfstring(L, "file (%p)", p->f);

+  return 1;

+}

+

+

+static FILE *tofile (lua_State *L) {

+  LStream *p = tolstream(L);

+  if (isclosed(p))

+    luaL_error(L, "attempt to use a closed file");

+  lua_assert(p->f);

+  return p->f;

+}

+

+

+/*

+** When creating file handles, always creates a 'closed' file handle

+** before opening the actual file; so, if there is a memory error, the

+** handle is in a consistent state.

+*/

+static LStream *newprefile (lua_State *L) {

+  LStream *p = (LStream *)lua_newuserdatauv(L, sizeof(LStream), 0);

+  p->closef = NULL;  /* mark file handle as 'closed' */

+  luaL_setmetatable(L, LUA_FILEHANDLE);

+  return p;

+}

+

+

+/*

+** Calls the 'close' function from a file handle. The 'volatile' avoids

+** a bug in some versions of the Clang compiler (e.g., clang 3.0 for

+** 32 bits).

+*/

+static int aux_close (lua_State *L) {

+  LStream *p = tolstream(L);

+  volatile lua_CFunction cf = p->closef;

+  p->closef = NULL;  /* mark stream as closed */

+  return (*cf)(L);  /* close it */

+}

+

+

+static int f_close (lua_State *L) {

+  tofile(L);  /* make sure argument is an open stream */

+  return aux_close(L);

+}

+

+

+static int io_close (lua_State *L) {

+  if (lua_isnone(L, 1))  /* no argument? */

+    lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT);  /* use default output */

+  return f_close(L);

+}

+

+

+static int f_gc (lua_State *L) {

+  LStream *p = tolstream(L);

+  if (!isclosed(p) && p->f != NULL)

+    aux_close(L);  /* ignore closed and incompletely open files */

+  return 0;

+}

+

+

+/*

+** function to close regular files

+*/

+static int io_fclose (lua_State *L) {

+  LStream *p = tolstream(L);

+  int res = fclose(p->f);

+  return luaL_fileresult(L, (res == 0), NULL);

+}

+

+

+static LStream *newfile (lua_State *L) {

+  LStream *p = newprefile(L);

+  p->f = NULL;

+  p->closef = &io_fclose;

+  return p;

+}

+

+

+static void opencheck (lua_State *L, const char *fname, const char *mode) {

+  LStream *p = newfile(L);

+  p->f = fopen(fname, mode);

+  if (p->f == NULL)

+    luaL_error(L, "cannot open file '%s' (%s)", fname, strerror(errno));

+}

+

+

+static int io_open (lua_State *L) {

+  const char *filename = luaL_checkstring(L, 1);

+  const char *mode = luaL_optstring(L, 2, "r");

+  LStream *p = newfile(L);

+  const char *md = mode;  /* to traverse/check mode */

+  luaL_argcheck(L, l_checkmode(md), 2, "invalid mode");

+  p->f = fopen(filename, mode);

+  return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;

+}

+

+

+/*

+** function to close 'popen' files

+*/

+static int io_pclose (lua_State *L) {

+  LStream *p = tolstream(L);

+  errno = 0;

+  return luaL_execresult(L, l_pclose(L, p->f));

+}

+

+

+static int io_popen (lua_State *L) {

+  const char *filename = luaL_checkstring(L, 1);

+  const char *mode = luaL_optstring(L, 2, "r");

+  LStream *p = newprefile(L);

+  luaL_argcheck(L, l_checkmodep(mode), 2, "invalid mode");

+  p->f = l_popen(L, filename, mode);

+  p->closef = &io_pclose;

+  return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;

+}

+

+

+static int io_tmpfile (lua_State *L) {

+  LStream *p = newfile(L);

+  p->f = tmpfile();

+  return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1;

+}

+

+

+static FILE *getiofile (lua_State *L, const char *findex) {

+  LStream *p;

+  lua_getfield(L, LUA_REGISTRYINDEX, findex);

+  p = (LStream *)lua_touserdata(L, -1);

+  if (isclosed(p))

+    luaL_error(L, "default %s file is closed", findex + IOPREF_LEN);

+  return p->f;

+}

+

+

+static int g_iofile (lua_State *L, const char *f, const char *mode) {

+  if (!lua_isnoneornil(L, 1)) {

+    const char *filename = lua_tostring(L, 1);

+    if (filename)

+      opencheck(L, filename, mode);

+    else {

+      tofile(L);  /* check that it's a valid file handle */

+      lua_pushvalue(L, 1);

+    }

+    lua_setfield(L, LUA_REGISTRYINDEX, f);

+  }

+  /* return current value */

+  lua_getfield(L, LUA_REGISTRYINDEX, f);

+  return 1;

+}

+

+

+static int io_input (lua_State *L) {

+  return g_iofile(L, IO_INPUT, "r");

+}

+

+

+static int io_output (lua_State *L) {

+  return g_iofile(L, IO_OUTPUT, "w");

+}

+

+

+static int io_readline (lua_State *L);

+

+

+/*

+** maximum number of arguments to 'f:lines'/'io.lines' (it + 3 must fit

+** in the limit for upvalues of a closure)

+*/

+#define MAXARGLINE	250

+

+/*

+** Auxiliary function to create the iteration function for 'lines'.

+** The iteration function is a closure over 'io_readline', with

+** the following upvalues:

+** 1) The file being read (first value in the stack)

+** 2) the number of arguments to read

+** 3) a boolean, true iff file has to be closed when finished ('toclose')

+** *) a variable number of format arguments (rest of the stack)

+*/

+static void aux_lines (lua_State *L, int toclose) {

+  int n = lua_gettop(L) - 1;  /* number of arguments to read */

+  luaL_argcheck(L, n <= MAXARGLINE, MAXARGLINE + 2, "too many arguments");

+  lua_pushvalue(L, 1);  /* file */

+  lua_pushinteger(L, n);  /* number of arguments to read */

+  lua_pushboolean(L, toclose);  /* close/not close file when finished */

+  lua_rotate(L, 2, 3);  /* move the three values to their positions */

+  lua_pushcclosure(L, io_readline, 3 + n);

+}

+

+

+static int f_lines (lua_State *L) {

+  tofile(L);  /* check that it's a valid file handle */

+  aux_lines(L, 0);

+  return 1;

+}

+

+

+/*

+** Return an iteration function for 'io.lines'. If file has to be

+** closed, also returns the file itself as a second result (to be

+** closed as the state at the exit of a generic for).

+*/

+static int io_lines (lua_State *L) {

+  int toclose;

+  if (lua_isnone(L, 1)) lua_pushnil(L);  /* at least one argument */

+  if (lua_isnil(L, 1)) {  /* no file name? */

+    lua_getfield(L, LUA_REGISTRYINDEX, IO_INPUT);  /* get default input */

+    lua_replace(L, 1);  /* put it at index 1 */

+    tofile(L);  /* check that it's a valid file handle */

+    toclose = 0;  /* do not close it after iteration */

+  }

+  else {  /* open a new file */

+    const char *filename = luaL_checkstring(L, 1);

+    opencheck(L, filename, "r");

+    lua_replace(L, 1);  /* put file at index 1 */

+    toclose = 1;  /* close it after iteration */

+  }

+  aux_lines(L, toclose);  /* push iteration function */

+  if (toclose) {

+    lua_pushnil(L);  /* state */

+    lua_pushnil(L);  /* control */

+    lua_pushvalue(L, 1);  /* file is the to-be-closed variable (4th result) */

+    return 4;

+  }

+  else

+    return 1;

+}

+

+

+/*

+** {======================================================

+** READ

+** =======================================================

+*/

+

+

+/* maximum length of a numeral */

+#if !defined (L_MAXLENNUM)

+#define L_MAXLENNUM     200

+#endif

+

+

+/* auxiliary structure used by 'read_number' */

+typedef struct {

+  FILE *f;  /* file being read */

+  int c;  /* current character (look ahead) */

+  int n;  /* number of elements in buffer 'buff' */

+  char buff[L_MAXLENNUM + 1];  /* +1 for ending '\0' */

+} RN;

+

+

+/*

+** Add current char to buffer (if not out of space) and read next one

+*/

+static int nextc (RN *rn) {

+  if (rn->n >= L_MAXLENNUM) {  /* buffer overflow? */

+    rn->buff[0] = '\0';  /* invalidate result */

+    return 0;  /* fail */

+  }

+  else {

+    rn->buff[rn->n++] = rn->c;  /* save current char */

+    rn->c = l_getc(rn->f);  /* read next one */

+    return 1;

+  }

+}

+

+

+/*

+** Accept current char if it is in 'set' (of size 2)

+*/

+static int test2 (RN *rn, const char *set) {

+  if (rn->c == set[0] || rn->c == set[1])

+    return nextc(rn);

+  else return 0;

+}

+

+

+/*

+** Read a sequence of (hex)digits

+*/

+static int readdigits (RN *rn, int hex) {

+  int count = 0;

+  while ((hex ? isxdigit(rn->c) : isdigit(rn->c)) && nextc(rn))

+    count++;

+  return count;

+}

+

+

+/*

+** Read a number: first reads a valid prefix of a numeral into a buffer.

+** Then it calls 'lua_stringtonumber' to check whether the format is

+** correct and to convert it to a Lua number.

+*/

+static int read_number (lua_State *L, FILE *f) {

+  RN rn;

+  int count = 0;

+  int hex = 0;

+  char decp[2];

+  rn.f = f; rn.n = 0;

+  decp[0] = lua_getlocaledecpoint();  /* get decimal point from locale */

+  decp[1] = '.';  /* always accept a dot */

+  l_lockfile(rn.f);

+  do { rn.c = l_getc(rn.f); } while (isspace(rn.c));  /* skip spaces */

+  test2(&rn, "-+");  /* optional sign */

+  if (test2(&rn, "00")) {

+    if (test2(&rn, "xX")) hex = 1;  /* numeral is hexadecimal */

+    else count = 1;  /* count initial '0' as a valid digit */

+  }

+  count += readdigits(&rn, hex);  /* integral part */

+  if (test2(&rn, decp))  /* decimal point? */

+    count += readdigits(&rn, hex);  /* fractional part */

+  if (count > 0 && test2(&rn, (hex ? "pP" : "eE"))) {  /* exponent mark? */

+    test2(&rn, "-+");  /* exponent sign */

+    readdigits(&rn, 0);  /* exponent digits */

+  }

+  ungetc(rn.c, rn.f);  /* unread look-ahead char */

+  l_unlockfile(rn.f);

+  rn.buff[rn.n] = '\0';  /* finish string */

+  if (lua_stringtonumber(L, rn.buff))  /* is this a valid number? */

+    return 1;  /* ok */

+  else {  /* invalid format */

+   lua_pushnil(L);  /* "result" to be removed */

+   return 0;  /* read fails */

+  }

+}

+

+

+static int test_eof (lua_State *L, FILE *f) {

+  int c = getc(f);

+  ungetc(c, f);  /* no-op when c == EOF */

+  lua_pushliteral(L, "");

+  return (c != EOF);

+}

+

+

+static int read_line (lua_State *L, FILE *f, int chop) {

+  luaL_Buffer b;

+  int c;

+  luaL_buffinit(L, &b);

+  do {  /* may need to read several chunks to get whole line */

+    char *buff = luaL_prepbuffer(&b);  /* preallocate buffer space */

+    int i = 0;

+    l_lockfile(f);  /* no memory errors can happen inside the lock */

+    while (i < LUAL_BUFFERSIZE && (c = l_getc(f)) != EOF && c != '\n')

+      buff[i++] = c;  /* read up to end of line or buffer limit */

+    l_unlockfile(f);

+    luaL_addsize(&b, i);

+  } while (c != EOF && c != '\n');  /* repeat until end of line */

+  if (!chop && c == '\n')  /* want a newline and have one? */

+    luaL_addchar(&b, c);  /* add ending newline to result */

+  luaL_pushresult(&b);  /* close buffer */

+  /* return ok if read something (either a newline or something else) */

+  return (c == '\n' || lua_rawlen(L, -1) > 0);

+}

+

+

+static void read_all (lua_State *L, FILE *f) {

+  size_t nr;

+  luaL_Buffer b;

+  luaL_buffinit(L, &b);

+  do {  /* read file in chunks of LUAL_BUFFERSIZE bytes */

+    char *p = luaL_prepbuffer(&b);

+    nr = fread(p, sizeof(char), LUAL_BUFFERSIZE, f);

+    luaL_addsize(&b, nr);

+  } while (nr == LUAL_BUFFERSIZE);

+  luaL_pushresult(&b);  /* close buffer */

+}

+

+

+static int read_chars (lua_State *L, FILE *f, size_t n) {

+  size_t nr;  /* number of chars actually read */

+  char *p;

+  luaL_Buffer b;

+  luaL_buffinit(L, &b);

+  p = luaL_prepbuffsize(&b, n);  /* prepare buffer to read whole block */

+  nr = fread(p, sizeof(char), n, f);  /* try to read 'n' chars */

+  luaL_addsize(&b, nr);

+  luaL_pushresult(&b);  /* close buffer */

+  return (nr > 0);  /* true iff read something */

+}

+

+

+static int g_read (lua_State *L, FILE *f, int first) {

+  int nargs = lua_gettop(L) - 1;

+  int n, success;

+  clearerr(f);

+  if (nargs == 0) {  /* no arguments? */

+    success = read_line(L, f, 1);

+    n = first + 1;  /* to return 1 result */

+  }

+  else {

+    /* ensure stack space for all results and for auxlib's buffer */

+    luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");

+    success = 1;

+    for (n = first; nargs-- && success; n++) {

+      if (lua_type(L, n) == LUA_TNUMBER) {

+        size_t l = (size_t)luaL_checkinteger(L, n);

+        success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);

+      }

+      else {

+        const char *p = luaL_checkstring(L, n);

+        if (*p == '*') p++;  /* skip optional '*' (for compatibility) */

+        switch (*p) {

+          case 'n':  /* number */

+            success = read_number(L, f);

+            break;

+          case 'l':  /* line */

+            success = read_line(L, f, 1);

+            break;

+          case 'L':  /* line with end-of-line */

+            success = read_line(L, f, 0);

+            break;

+          case 'a':  /* file */

+            read_all(L, f);  /* read entire file */

+            success = 1; /* always success */

+            break;

+          default:

+            return luaL_argerror(L, n, "invalid format");

+        }

+      }

+    }

+  }

+  if (ferror(f))

+    return luaL_fileresult(L, 0, NULL);

+  if (!success) {

+    lua_pop(L, 1);  /* remove last result */

+    luaL_pushfail(L);  /* push nil instead */

+  }

+  return n - first;

+}

+

+

+static int io_read (lua_State *L) {

+  return g_read(L, getiofile(L, IO_INPUT), 1);

+}

+

+

+static int f_read (lua_State *L) {

+  return g_read(L, tofile(L), 2);

+}

+

+

+/*

+** Iteration function for 'lines'.

+*/

+static int io_readline (lua_State *L) {

+  LStream *p = (LStream *)lua_touserdata(L, lua_upvalueindex(1));

+  int i;

+  int n = (int)lua_tointeger(L, lua_upvalueindex(2));

+  if (isclosed(p))  /* file is already closed? */

+    return luaL_error(L, "file is already closed");

+  lua_settop(L , 1);

+  luaL_checkstack(L, n, "too many arguments");

+  for (i = 1; i <= n; i++)  /* push arguments to 'g_read' */

+    lua_pushvalue(L, lua_upvalueindex(3 + i));

+  n = g_read(L, p->f, 2);  /* 'n' is number of results */

+  lua_assert(n > 0);  /* should return at least a nil */

+  if (lua_toboolean(L, -n))  /* read at least one value? */

+    return n;  /* return them */

+  else {  /* first result is false: EOF or error */

+    if (n > 1) {  /* is there error information? */

+      /* 2nd result is error message */

+      return luaL_error(L, "%s", lua_tostring(L, -n + 1));

+    }

+    if (lua_toboolean(L, lua_upvalueindex(3))) {  /* generator created file? */

+      lua_settop(L, 0);  /* clear stack */

+      lua_pushvalue(L, lua_upvalueindex(1));  /* push file at index 1 */

+      aux_close(L);  /* close it */

+    }

+    return 0;

+  }

+}

+

+/* }====================================================== */

+

+

+static int g_write (lua_State *L, FILE *f, int arg) {

+  int nargs = lua_gettop(L) - arg;

+  int status = 1;

+  for (; nargs--; arg++) {

+    if (lua_type(L, arg) == LUA_TNUMBER) {

+      /* optimization: could be done exactly as for strings */

+      int len = lua_isinteger(L, arg)

+                ? fprintf(f, LUA_INTEGER_FMT,

+                             (LUAI_UACINT)lua_tointeger(L, arg))

+                : fprintf(f, LUA_NUMBER_FMT,

+                             (LUAI_UACNUMBER)lua_tonumber(L, arg));

+      status = status && (len > 0);

+    }

+    else {

+      size_t l;

+      const char *s = luaL_checklstring(L, arg, &l);

+      status = status && (fwrite(s, sizeof(char), l, f) == l);

+    }

+  }

+  if (status) return 1;  /* file handle already on stack top */

+  else return luaL_fileresult(L, status, NULL);

+}

+

+

+static int io_write (lua_State *L) {

+  return g_write(L, getiofile(L, IO_OUTPUT), 1);

+}

+

+

+static int f_write (lua_State *L) {

+  FILE *f = tofile(L);

+  lua_pushvalue(L, 1);  /* push file at the stack top (to be returned) */

+  return g_write(L, f, 2);

+}

+

+

+static int f_seek (lua_State *L) {

+  static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};

+  static const char *const modenames[] = {"set", "cur", "end", NULL};

+  FILE *f = tofile(L);

+  int op = luaL_checkoption(L, 2, "cur", modenames);

+  lua_Integer p3 = luaL_optinteger(L, 3, 0);

+  l_seeknum offset = (l_seeknum)p3;

+  luaL_argcheck(L, (lua_Integer)offset == p3, 3,

+                  "not an integer in proper range");

+  op = l_fseek(f, offset, mode[op]);

+  if (op)

+    return luaL_fileresult(L, 0, NULL);  /* error */

+  else {

+    lua_pushinteger(L, (lua_Integer)l_ftell(f));

+    return 1;

+  }

+}

+

+

+static int f_setvbuf (lua_State *L) {

+  static const int mode[] = {_IONBF, _IOFBF, _IOLBF};

+  static const char *const modenames[] = {"no", "full", "line", NULL};

+  FILE *f = tofile(L);

+  int op = luaL_checkoption(L, 2, NULL, modenames);

+  lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE);

+  int res = setvbuf(f, NULL, mode[op], (size_t)sz);

+  return luaL_fileresult(L, res == 0, NULL);

+}

+

+

+

+static int io_flush (lua_State *L) {

+  return luaL_fileresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);

+}

+

+

+static int f_flush (lua_State *L) {

+  return luaL_fileresult(L, fflush(tofile(L)) == 0, NULL);

+}

+

+

+/*

+** functions for 'io' library

+*/

+static const luaL_Reg iolib[] = {

+  {"close", io_close},

+  {"flush", io_flush},

+  {"input", io_input},

+  {"lines", io_lines},

+  {"open", io_open},

+  {"output", io_output},

+  {"popen", io_popen},

+  {"read", io_read},

+  {"tmpfile", io_tmpfile},

+  {"type", io_type},

+  {"write", io_write},

+  {NULL, NULL}

+};

+

+

+/*

+** methods for file handles

+*/

+static const luaL_Reg meth[] = {

+  {"read", f_read},

+  {"write", f_write},

+  {"lines", f_lines},

+  {"flush", f_flush},

+  {"seek", f_seek},

+  {"close", f_close},

+  {"setvbuf", f_setvbuf},

+  {NULL, NULL}

+};

+

+

+/*

+** metamethods for file handles

+*/

+static const luaL_Reg metameth[] = {

+  {"__index", NULL},  /* place holder */

+  {"__gc", f_gc},

+  {"__close", f_gc},

+  {"__tostring", f_tostring},

+  {NULL, NULL}

+};

+

+

+static void createmeta (lua_State *L) {

+  luaL_newmetatable(L, LUA_FILEHANDLE);  /* metatable for file handles */

+  luaL_setfuncs(L, metameth, 0);  /* add metamethods to new metatable */

+  luaL_newlibtable(L, meth);  /* create method table */

+  luaL_setfuncs(L, meth, 0);  /* add file methods to method table */

+  lua_setfield(L, -2, "__index");  /* metatable.__index = method table */

+  lua_pop(L, 1);  /* pop metatable */

+}

+

+

+/*

+** function to (not) close the standard files stdin, stdout, and stderr

+*/

+static int io_noclose (lua_State *L) {

+  LStream *p = tolstream(L);

+  p->closef = &io_noclose;  /* keep file opened */

+  luaL_pushfail(L);

+  lua_pushliteral(L, "cannot close standard file");

+  return 2;

+}

+

+

+static void createstdfile (lua_State *L, FILE *f, const char *k,

+                           const char *fname) {

+  LStream *p = newprefile(L);

+  p->f = f;

+  p->closef = &io_noclose;

+  if (k != NULL) {

+    lua_pushvalue(L, -1);

+    lua_setfield(L, LUA_REGISTRYINDEX, k);  /* add file to registry */

+  }

+  lua_setfield(L, -2, fname);  /* add file to module */

+}

+

+

+LUAMOD_API int luaopen_io (lua_State *L) {

+  luaL_newlib(L, iolib);  /* new module */

+  createmeta(L);

+  /* create (and set) default files */

+  createstdfile(L, stdin, IO_INPUT, "stdin");

+  createstdfile(L, stdout, IO_OUTPUT, "stdout");

+  createstdfile(L, stderr, NULL, "stderr");

+  return 1;

+}

+

--- /dev/null

+++ b/ljumptab.h

@@ -1,0 +1,112 @@

+/*

+** $Id: ljumptab.h $

+** Jump Table for the Lua interpreter

+** See Copyright Notice in lua.h

+*/

+

+

+#undef vmdispatch

+#undef vmcase

+#undef vmbreak

+

+#define vmdispatch(x)     goto *disptab[x];

+

+#define vmcase(l)     L_##l:

+

+#define vmbreak		vmfetch(); vmdispatch(GET_OPCODE(i));

+

+

+static const void *const disptab[NUM_OPCODES] = {

+

+#if 0

+** you can update the following list with this command:

+**

+**  sed -n '/^OP_/\!d; s/OP_/\&\&L_OP_/ ; s/,.*/,/ ; s/\/.*// ; p'  lopcodes.h

+**

+#endif

+

+&&L_OP_MOVE,

+&&L_OP_LOADI,

+&&L_OP_LOADF,

+&&L_OP_LOADK,

+&&L_OP_LOADKX,

+&&L_OP_LOADFALSE,

+&&L_OP_LFALSESKIP,

+&&L_OP_LOADTRUE,

+&&L_OP_LOADNIL,

+&&L_OP_GETUPVAL,

+&&L_OP_SETUPVAL,

+&&L_OP_GETTABUP,

+&&L_OP_GETTABLE,

+&&L_OP_GETI,

+&&L_OP_GETFIELD,

+&&L_OP_SETTABUP,

+&&L_OP_SETTABLE,

+&&L_OP_SETI,

+&&L_OP_SETFIELD,

+&&L_OP_NEWTABLE,

+&&L_OP_SELF,

+&&L_OP_ADDI,

+&&L_OP_ADDK,

+&&L_OP_SUBK,

+&&L_OP_MULK,

+&&L_OP_MODK,

+&&L_OP_POWK,

+&&L_OP_DIVK,

+&&L_OP_IDIVK,

+&&L_OP_BANDK,

+&&L_OP_BORK,

+&&L_OP_BXORK,

+&&L_OP_SHRI,

+&&L_OP_SHLI,

+&&L_OP_ADD,

+&&L_OP_SUB,

+&&L_OP_MUL,

+&&L_OP_MOD,

+&&L_OP_POW,

+&&L_OP_DIV,

+&&L_OP_IDIV,

+&&L_OP_BAND,

+&&L_OP_BOR,

+&&L_OP_BXOR,

+&&L_OP_SHL,

+&&L_OP_SHR,

+&&L_OP_MMBIN,

+&&L_OP_MMBINI,

+&&L_OP_MMBINK,

+&&L_OP_UNM,

+&&L_OP_BNOT,

+&&L_OP_NOT,

+&&L_OP_LEN,

+&&L_OP_CONCAT,

+&&L_OP_CLOSE,

+&&L_OP_TBC,

+&&L_OP_JMP,

+&&L_OP_EQ,

+&&L_OP_LT,

+&&L_OP_LE,

+&&L_OP_EQK,

+&&L_OP_EQI,

+&&L_OP_LTI,

+&&L_OP_LEI,

+&&L_OP_GTI,

+&&L_OP_GEI,

+&&L_OP_TEST,

+&&L_OP_TESTSET,

+&&L_OP_CALL,

+&&L_OP_TAILCALL,

+&&L_OP_RETURN,

+&&L_OP_RETURN0,

+&&L_OP_RETURN1,

+&&L_OP_FORLOOP,

+&&L_OP_FORPREP,

+&&L_OP_TFORPREP,

+&&L_OP_TFORCALL,

+&&L_OP_TFORLOOP,

+&&L_OP_SETLIST,

+&&L_OP_CLOSURE,

+&&L_OP_VARARG,

+&&L_OP_VARARGPREP,

+&&L_OP_EXTRAARG

+

+};

--- /dev/null

+++ b/llex.c

@@ -1,0 +1,578 @@

+/*

+** $Id: llex.c $

+** Lexical Analyzer

+** See Copyright Notice in lua.h

+*/

+

+#define llex_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <locale.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "lctype.h"

+#include "ldebug.h"

+#include "ldo.h"

+#include "lgc.h"

+#include "llex.h"

+#include "lobject.h"

+#include "lparser.h"

+#include "lstate.h"

+#include "lstring.h"

+#include "ltable.h"

+#include "lzio.h"

+

+

+

+#define next(ls)	(ls->current = zgetc(ls->z))

+

+

+

+#define currIsNewline(ls)	(ls->current == '\n' || ls->current == '\r')

+

+

+/* ORDER RESERVED */

+static const char *const luaX_tokens [] = {

+    "and", "break", "do", "else", "elseif",

+    "end", "false", "for", "function", "goto", "if",

+    "in", "local", "nil", "not", "or", "repeat",

+    "return", "then", "true", "until", "while",

+    "//", "..", "...", "==", ">=", "<=", "~=",

+    "<<", ">>", "::", "<eof>",

+    "<number>", "<integer>", "<name>", "<string>"

+};

+

+

+#define save_and_next(ls) (save(ls, ls->current), next(ls))

+

+

+static l_noret lexerror (LexState *ls, const char *msg, int token);

+

+

+static void save (LexState *ls, int c) {

+  Mbuffer *b = ls->buff;

+  if (luaZ_bufflen(b) + 1 > luaZ_sizebuffer(b)) {

+    size_t newsize;

+    if (luaZ_sizebuffer(b) >= MAX_SIZE/2)

+      lexerror(ls, "lexical element too long", 0);

+    newsize = luaZ_sizebuffer(b) * 2;

+    luaZ_resizebuffer(ls->L, b, newsize);

+  }

+  b->buffer[luaZ_bufflen(b)++] = cast_char(c);

+}

+

+

+void luaX_init (lua_State *L) {

+  int i;

+  TString *e = luaS_newliteral(L, LUA_ENV);  /* create env name */

+  luaC_fix(L, obj2gco(e));  /* never collect this name */

+  for (i=0; i<NUM_RESERVED; i++) {

+    TString *ts = luaS_new(L, luaX_tokens[i]);

+    luaC_fix(L, obj2gco(ts));  /* reserved words are never collected */

+    ts->extra = cast_byte(i+1);  /* reserved word */

+  }

+}

+

+

+const char *luaX_token2str (LexState *ls, int token) {

+  if (token < FIRST_RESERVED) {  /* single-byte symbols? */

+    if (lisprint(token))

+      return luaO_pushfstring(ls->L, "'%c'", token);

+    else  /* control character */

+      return luaO_pushfstring(ls->L, "'<\\%d>'", token);

+  }

+  else {

+    const char *s = luaX_tokens[token - FIRST_RESERVED];

+    if (token < TK_EOS)  /* fixed format (symbols and reserved words)? */

+      return luaO_pushfstring(ls->L, "'%s'", s);

+    else  /* names, strings, and numerals */

+      return s;

+  }

+}

+

+

+static const char *txtToken (LexState *ls, int token) {

+  switch (token) {

+    case TK_NAME: case TK_STRING:

+    case TK_FLT: case TK_INT:

+      save(ls, '\0');

+      return luaO_pushfstring(ls->L, "'%s'", luaZ_buffer(ls->buff));

+    default:

+      return luaX_token2str(ls, token);

+  }

+}

+

+

+static l_noret lexerror (LexState *ls, const char *msg, int token) {

+  msg = luaG_addinfo(ls->L, msg, ls->source, ls->linenumber);

+  if (token)

+    luaO_pushfstring(ls->L, "%s near %s", msg, txtToken(ls, token));

+  luaD_throw(ls->L, LUA_ERRSYNTAX);

+}

+

+

+l_noret luaX_syntaxerror (LexState *ls, const char *msg) {

+  lexerror(ls, msg, ls->t.token);

+}

+

+

+/*

+** creates a new string and anchors it in scanner's table so that

+** it will not be collected until the end of the compilation

+** (by that time it should be anchored somewhere)

+*/

+TString *luaX_newstring (LexState *ls, const char *str, size_t l) {

+  lua_State *L = ls->L;

+  TValue *o;  /* entry for 'str' */

+  TString *ts = luaS_newlstr(L, str, l);  /* create new string */

+  setsvalue2s(L, L->top++, ts);  /* temporarily anchor it in stack */

+  o = luaH_set(L, ls->h, s2v(L->top - 1));

+  if (isempty(o)) {  /* not in use yet? */

+    /* boolean value does not need GC barrier;

+       table is not a metatable, so it does not need to invalidate cache */

+    setbtvalue(o);  /* t[string] = true */

+    luaC_checkGC(L);

+  }

+  else {  /* string already present */

+    ts = keystrval(nodefromval(o));  /* re-use value previously stored */

+  }

+  L->top--;  /* remove string from stack */

+  return ts;

+}

+

+

+/*

+** increment line number and skips newline sequence (any of

+** \n, \r, \n\r, or \r\n)

+*/

+static void inclinenumber (LexState *ls) {

+  int old = ls->current;

+  lua_assert(currIsNewline(ls));

+  next(ls);  /* skip '\n' or '\r' */

+  if (currIsNewline(ls) && ls->current != old)

+    next(ls);  /* skip '\n\r' or '\r\n' */

+  if (++ls->linenumber >= MAX_INT)

+    lexerror(ls, "chunk has too many lines", 0);

+}

+

+

+void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source,

+                    int firstchar) {

+  ls->t.token = 0;

+  ls->L = L;

+  ls->current = firstchar;

+  ls->lookahead.token = TK_EOS;  /* no look-ahead token */

+  ls->z = z;

+  ls->fs = NULL;

+  ls->linenumber = 1;

+  ls->lastline = 1;

+  ls->source = source;

+  ls->envn = luaS_newliteral(L, LUA_ENV);  /* get env name */

+  luaZ_resizebuffer(ls->L, ls->buff, LUA_MINBUFFER);  /* initialize buffer */

+}

+

+

+

+/*

+** =======================================================

+** LEXICAL ANALYZER

+** =======================================================

+*/

+

+

+static int check_next1 (LexState *ls, int c) {

+  if (ls->current == c) {

+    next(ls);

+    return 1;

+  }

+  else return 0;

+}

+

+

+/*

+** Check whether current char is in set 'set' (with two chars) and

+** saves it

+*/

+static int check_next2 (LexState *ls, const char *set) {

+  lua_assert(set[2] == '\0');

+  if (ls->current == set[0] || ls->current == set[1]) {

+    save_and_next(ls);

+    return 1;

+  }

+  else return 0;

+}

+

+

+/* LUA_NUMBER */

+/*

+** This function is quite liberal in what it accepts, as 'luaO_str2num'

+** will reject ill-formed numerals. Roughly, it accepts the following

+** pattern:

+**

+**   %d(%x|%.|([Ee][+-]?))* | 0[Xx](%x|%.|([Pp][+-]?))*

+**

+** The only tricky part is to accept [+-] only after a valid exponent

+** mark, to avoid reading '3-4' or '0xe+1' as a single number.

+**

+** The caller might have already read an initial dot.

+*/

+static int read_numeral (LexState *ls, SemInfo *seminfo) {

+  TValue obj;

+  const char *expo = "Ee";

+  int first = ls->current;

+  lua_assert(lisdigit(ls->current));

+  save_and_next(ls);

+  if (first == '0' && check_next2(ls, "xX"))  /* hexadecimal? */

+    expo = "Pp";

+  for (;;) {

+    if (check_next2(ls, expo))  /* exponent mark? */

+      check_next2(ls, "-+");  /* optional exponent sign */

+    else if (lisxdigit(ls->current) || ls->current == '.')  /* '%x|%.' */

+      save_and_next(ls);

+    else break;

+  }

+  if (lislalpha(ls->current))  /* is numeral touching a letter? */

+    save_and_next(ls);  /* force an error */

+  save(ls, '\0');

+  if (luaO_str2num(luaZ_buffer(ls->buff), &obj) == 0)  /* format error? */

+    lexerror(ls, "malformed number", TK_FLT);

+  if (ttisinteger(&obj)) {

+    seminfo->i = ivalue(&obj);

+    return TK_INT;

+  }

+  else {

+    lua_assert(ttisfloat(&obj));

+    seminfo->r = fltvalue(&obj);

+    return TK_FLT;

+  }

+}

+

+

+/*

+** read a sequence '[=*[' or ']=*]', leaving the last bracket. If

+** sequence is well formed, return its number of '='s + 2; otherwise,

+** return 1 if it is a single bracket (no '='s and no 2nd bracket);

+** otherwise (an unfinished '[==...') return 0.

+*/

+static size_t skip_sep (LexState *ls) {

+  size_t count = 0;

+  int s = ls->current;

+  lua_assert(s == '[' || s == ']');

+  save_and_next(ls);

+  while (ls->current == '=') {

+    save_and_next(ls);

+    count++;

+  }

+  return (ls->current == s) ? count + 2

+         : (count == 0) ? 1

+         : 0;

+}

+

+

+static void read_long_string (LexState *ls, SemInfo *seminfo, size_t sep) {

+  int line = ls->linenumber;  /* initial line (for error message) */

+  save_and_next(ls);  /* skip 2nd '[' */

+  if (currIsNewline(ls))  /* string starts with a newline? */

+    inclinenumber(ls);  /* skip it */

+  for (;;) {

+    switch (ls->current) {

+      case EOZ: {  /* error */

+        const char *what = (seminfo ? "string" : "comment");

+        const char *msg = luaO_pushfstring(ls->L,

+                     "unfinished long %s (starting at line %d)", what, line);

+        lexerror(ls, msg, TK_EOS);

+        break;  /* to avoid warnings */

+      }

+      case ']': {

+        if (skip_sep(ls) == sep) {

+          save_and_next(ls);  /* skip 2nd ']' */

+          goto endloop;

+        }

+        break;

+      }

+      case '\n': case '\r': {

+        save(ls, '\n');

+        inclinenumber(ls);

+        if (!seminfo) luaZ_resetbuffer(ls->buff);  /* avoid wasting space */

+        break;

+      }

+      default: {

+        if (seminfo) save_and_next(ls);

+        else next(ls);

+      }

+    }

+  } endloop:

+  if (seminfo)

+    seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + sep,

+                                     luaZ_bufflen(ls->buff) - 2 * sep);

+}

+

+

+static void esccheck (LexState *ls, int c, const char *msg) {

+  if (!c) {

+    if (ls->current != EOZ)

+      save_and_next(ls);  /* add current to buffer for error message */

+    lexerror(ls, msg, TK_STRING);

+  }

+}

+

+

+static int gethexa (LexState *ls) {

+  save_and_next(ls);

+  esccheck (ls, lisxdigit(ls->current), "hexadecimal digit expected");

+  return luaO_hexavalue(ls->current);

+}

+

+

+static int readhexaesc (LexState *ls) {

+  int r = gethexa(ls);

+  r = (r << 4) + gethexa(ls);

+  luaZ_buffremove(ls->buff, 2);  /* remove saved chars from buffer */

+  return r;

+}

+

+

+static unsigned long readutf8esc (LexState *ls) {

+  unsigned long r;

+  int i = 4;  /* chars to be removed: '\', 'u', '{', and first digit */

+  save_and_next(ls);  /* skip 'u' */

+  esccheck(ls, ls->current == '{', "missing '{'");

+  r = gethexa(ls);  /* must have at least one digit */

+  while (cast_void(save_and_next(ls)), lisxdigit(ls->current)) {

+    i++;

+    esccheck(ls, r <= (0x7FFFFFFFu >> 4), "UTF-8 value too large");

+    r = (r << 4) + luaO_hexavalue(ls->current);

+  }

+  esccheck(ls, ls->current == '}', "missing '}'");

+  next(ls);  /* skip '}' */

+  luaZ_buffremove(ls->buff, i);  /* remove saved chars from buffer */

+  return r;

+}

+

+

+static void utf8esc (LexState *ls) {

+  char buff[UTF8BUFFSZ];

+  int n = luaO_utf8esc(buff, readutf8esc(ls));

+  for (; n > 0; n--)  /* add 'buff' to string */

+    save(ls, buff[UTF8BUFFSZ - n]);

+}

+

+

+static int readdecesc (LexState *ls) {

+  int i;

+  int r = 0;  /* result accumulator */

+  for (i = 0; i < 3 && lisdigit(ls->current); i++) {  /* read up to 3 digits */

+    r = 10*r + ls->current - '0';

+    save_and_next(ls);

+  }

+  esccheck(ls, r <= UCHAR_MAX, "decimal escape too large");

+  luaZ_buffremove(ls->buff, i);  /* remove read digits from buffer */

+  return r;

+}

+

+

+static void read_string (LexState *ls, int del, SemInfo *seminfo) {

+  save_and_next(ls);  /* keep delimiter (for error messages) */

+  while (ls->current != del) {

+    switch (ls->current) {

+      case EOZ:

+        lexerror(ls, "unfinished string", TK_EOS);

+        break;  /* to avoid warnings */

+      case '\n':

+      case '\r':

+        lexerror(ls, "unfinished string", TK_STRING);

+        break;  /* to avoid warnings */

+      case '\\': {  /* escape sequences */

+        int c;  /* final character to be saved */

+        save_and_next(ls);  /* keep '\\' for error messages */

+        switch (ls->current) {

+          case 'a': c = '\a'; goto read_save;

+          case 'b': c = '\b'; goto read_save;

+          case 'f': c = '\f'; goto read_save;

+          case 'n': c = '\n'; goto read_save;

+          case 'r': c = '\r'; goto read_save;

+          case 't': c = '\t'; goto read_save;

+          case 'v': c = '\v'; goto read_save;

+          case 'x': c = readhexaesc(ls); goto read_save;

+          case 'u': utf8esc(ls);  goto no_save;

+          case '\n': case '\r':

+            inclinenumber(ls); c = '\n'; goto only_save;

+          case '\\': case '\"': case '\'':

+            c = ls->current; goto read_save;

+          case EOZ: goto no_save;  /* will raise an error next loop */

+          case 'z': {  /* zap following span of spaces */

+            luaZ_buffremove(ls->buff, 1);  /* remove '\\' */

+            next(ls);  /* skip the 'z' */

+            while (lisspace(ls->current)) {

+              if (currIsNewline(ls)) inclinenumber(ls);

+              else next(ls);

+            }

+            goto no_save;

+          }

+          default: {

+            esccheck(ls, lisdigit(ls->current), "invalid escape sequence");

+            c = readdecesc(ls);  /* digital escape '\ddd' */

+            goto only_save;

+          }

+        }

+       read_save:

+         next(ls);

+         /* go through */

+       only_save:

+         luaZ_buffremove(ls->buff, 1);  /* remove '\\' */

+         save(ls, c);

+         /* go through */

+       no_save: break;

+      }

+      default:

+        save_and_next(ls);

+    }

+  }

+  save_and_next(ls);  /* skip delimiter */

+  seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + 1,

+                                   luaZ_bufflen(ls->buff) - 2);

+}

+

+

+static int llex (LexState *ls, SemInfo *seminfo) {

+  luaZ_resetbuffer(ls->buff);

+  for (;;) {

+    switch (ls->current) {

+      case '\n': case '\r': {  /* line breaks */

+        inclinenumber(ls);

+        break;

+      }

+      case ' ': case '\f': case '\t': case '\v': {  /* spaces */

+        next(ls);

+        break;

+      }

+      case '-': {  /* '-' or '--' (comment) */

+        next(ls);

+        if (ls->current != '-') return '-';

+        /* else is a comment */

+        next(ls);

+        if (ls->current == '[') {  /* long comment? */

+          size_t sep = skip_sep(ls);

+          luaZ_resetbuffer(ls->buff);  /* 'skip_sep' may dirty the buffer */

+          if (sep >= 2) {

+            read_long_string(ls, NULL, sep);  /* skip long comment */

+            luaZ_resetbuffer(ls->buff);  /* previous call may dirty the buff. */

+            break;

+          }

+        }

+        /* else short comment */

+        while (!currIsNewline(ls) && ls->current != EOZ)

+          next(ls);  /* skip until end of line (or end of file) */

+        break;

+      }

+      case '[': {  /* long string or simply '[' */

+        size_t sep = skip_sep(ls);

+        if (sep >= 2) {

+          read_long_string(ls, seminfo, sep);

+          return TK_STRING;

+        }

+        else if (sep == 0)  /* '[=...' missing second bracket? */

+          lexerror(ls, "invalid long string delimiter", TK_STRING);

+        return '[';

+      }

+      case '=': {

+        next(ls);

+        if (check_next1(ls, '=')) return TK_EQ;  /* '==' */

+        else return '=';

+      }

+      case '<': {

+        next(ls);

+        if (check_next1(ls, '=')) return TK_LE;  /* '<=' */

+        else if (check_next1(ls, '<')) return TK_SHL;  /* '<<' */

+        else return '<';

+      }

+      case '>': {

+        next(ls);

+        if (check_next1(ls, '=')) return TK_GE;  /* '>=' */

+        else if (check_next1(ls, '>')) return TK_SHR;  /* '>>' */

+        else return '>';

+      }

+      case '/': {

+        next(ls);

+        if (check_next1(ls, '/')) return TK_IDIV;  /* '//' */

+        else return '/';

+      }

+      case '~': {

+        next(ls);

+        if (check_next1(ls, '=')) return TK_NE;  /* '~=' */

+        else return '~';

+      }

+      case ':': {

+        next(ls);

+        if (check_next1(ls, ':')) return TK_DBCOLON;  /* '::' */

+        else return ':';

+      }

+      case '"': case '\'': {  /* short literal strings */

+        read_string(ls, ls->current, seminfo);

+        return TK_STRING;

+      }

+      case '.': {  /* '.', '..', '...', or number */

+        save_and_next(ls);

+        if (check_next1(ls, '.')) {

+          if (check_next1(ls, '.'))

+            return TK_DOTS;   /* '...' */

+          else return TK_CONCAT;   /* '..' */

+        }

+        else if (!lisdigit(ls->current)) return '.';

+        else return read_numeral(ls, seminfo);

+      }

+      case '0': case '1': case '2': case '3': case '4':

+      case '5': case '6': case '7': case '8': case '9': {

+        return read_numeral(ls, seminfo);

+      }

+      case EOZ: {

+        return TK_EOS;

+      }

+      default: {

+        if (lislalpha(ls->current)) {  /* identifier or reserved word? */

+          TString *ts;

+          do {

+            save_and_next(ls);

+          } while (lislalnum(ls->current));

+          ts = luaX_newstring(ls, luaZ_buffer(ls->buff),

+                                  luaZ_bufflen(ls->buff));

+          seminfo->ts = ts;

+          if (isreserved(ts))  /* reserved word? */

+            return ts->extra - 1 + FIRST_RESERVED;

+          else {

+            return TK_NAME;

+          }

+        }

+        else {  /* single-char tokens ('+', '*', '%', '{', '}', ...) */

+          int c = ls->current;

+          next(ls);

+          return c;

+        }

+      }

+    }

+  }

+}

+

+

+void luaX_next (LexState *ls) {

+  ls->lastline = ls->linenumber;

+  if (ls->lookahead.token != TK_EOS) {  /* is there a look-ahead token? */

+    ls->t = ls->lookahead;  /* use this one */

+    ls->lookahead.token = TK_EOS;  /* and discharge it */

+  }

+  else

+    ls->t.token = llex(ls, &ls->t.seminfo);  /* read next token */

+}

+

+

+int luaX_lookahead (LexState *ls) {

+  lua_assert(ls->lookahead.token == TK_EOS);

+  ls->lookahead.token = llex(ls, &ls->lookahead.seminfo);

+  return ls->lookahead.token;

+}

+

--- /dev/null

+++ b/llex.h

@@ -1,0 +1,91 @@

+/*

+** $Id: llex.h $

+** Lexical Analyzer

+** See Copyright Notice in lua.h

+*/

+

+#ifndef llex_h

+#define llex_h

+

+#include <limits.h>

+

+#include "lobject.h"

+#include "lzio.h"

+

+

+/*

+** Single-char tokens (terminal symbols) are represented by their own

+** numeric code. Other tokens start at the following value.

+*/

+#define FIRST_RESERVED	(UCHAR_MAX + 1)

+

+

+#if !defined(LUA_ENV)

+#define LUA_ENV		"_ENV"

+#endif

+

+

+/*

+* WARNING: if you change the order of this enumeration,

+* grep "ORDER RESERVED"

+*/

+enum RESERVED {

+  /* terminal symbols denoted by reserved words */

+  TK_AND = FIRST_RESERVED, TK_BREAK,

+  TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,

+  TK_GOTO, TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,

+  TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,

+  /* other terminal symbols */

+  TK_IDIV, TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE,

+  TK_SHL, TK_SHR,

+  TK_DBCOLON, TK_EOS,

+  TK_FLT, TK_INT, TK_NAME, TK_STRING

+};

+

+/* number of reserved words */

+#define NUM_RESERVED	(cast_int(TK_WHILE-FIRST_RESERVED + 1))

+

+

+typedef union {

+  lua_Number r;

+  lua_Integer i;

+  TString *ts;

+} SemInfo;  /* semantics information */

+

+

+typedef struct Token {

+  int token;

+  SemInfo seminfo;

+} Token;

+

+

+/* state of the lexer plus state of the parser when shared by all

+   functions */

+typedef struct LexState {

+  int current;  /* current character (charint) */

+  int linenumber;  /* input line counter */

+  int lastline;  /* line of last token 'consumed' */

+  Token t;  /* current token */

+  Token lookahead;  /* look ahead token */

+  struct FuncState *fs;  /* current function (parser) */

+  struct lua_State *L;

+  ZIO *z;  /* input stream */

+  Mbuffer *buff;  /* buffer for tokens */

+  Table *h;  /* to avoid collection/reuse strings */

+  struct Dyndata *dyd;  /* dynamic structures used by the parser */

+  TString *source;  /* current source name */

+  TString *envn;  /* environment variable name */

+} LexState;

+

+

+LUAI_FUNC void luaX_init (lua_State *L);

+LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,

+                              TString *source, int firstchar);

+LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);

+LUAI_FUNC void luaX_next (LexState *ls);

+LUAI_FUNC int luaX_lookahead (LexState *ls);

+LUAI_FUNC l_noret luaX_syntaxerror (LexState *ls, const char *s);

+LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);

+

+

+#endif

--- /dev/null

+++ b/llimits.h

@@ -1,0 +1,369 @@

+/*

+** $Id: llimits.h $

+** Limits, basic types, and some other 'installation-dependent' definitions

+** See Copyright Notice in lua.h

+*/

+

+#ifndef llimits_h

+#define llimits_h

+

+

+#include <limits.h>

+#include <stddef.h>

+

+

+#include "lua.h"

+

+

+/*

+** 'lu_mem' and 'l_mem' are unsigned/signed integers big enough to count

+** the total memory used by Lua (in bytes). Usually, 'size_t' and

+** 'ptrdiff_t' should work, but we use 'long' for 16-bit machines.

+*/

+#if defined(LUAI_MEM)		/* { external definitions? */

+typedef LUAI_UMEM lu_mem;

+typedef LUAI_MEM l_mem;

+#elif LUAI_IS32INT	/* }{ */

+typedef size_t lu_mem;

+typedef ptrdiff_t l_mem;

+#else  /* 16-bit ints */	/* }{ */

+typedef unsigned long lu_mem;

+typedef long l_mem;

+#endif				/* } */

+

+

+/* chars used as small naturals (so that 'char' is reserved for characters) */

+typedef unsigned char lu_byte;

+typedef signed char ls_byte;

+

+

+/* maximum value for size_t */

+#define MAX_SIZET	((size_t)(~(size_t)0))

+

+/* maximum size visible for Lua (must be representable in a lua_Integer) */

+#define MAX_SIZE	(sizeof(size_t) < sizeof(lua_Integer) ? MAX_SIZET \

+                          : (size_t)(LUA_MAXINTEGER))

+

+

+#define MAX_LUMEM	((lu_mem)(~(lu_mem)0))

+

+#define MAX_LMEM	((l_mem)(MAX_LUMEM >> 1))

+

+

+#define MAX_INT		INT_MAX  /* maximum value of an int */

+

+

+/*

+** floor of the log2 of the maximum signed value for integral type 't'.

+** (That is, maximum 'n' such that '2^n' fits in the given signed type.)

+*/

+#define log2maxs(t)	(sizeof(t) * 8 - 2)

+

+

+/*

+** test whether an unsigned value is a power of 2 (or zero)

+*/

+#define ispow2(x)	(((x) & ((x) - 1)) == 0)

+

+

+/* number of chars of a literal string without the ending \0 */

+#define LL(x)   (sizeof(x)/sizeof(char) - 1)

+

+

+/*

+** conversion of pointer to unsigned integer:

+** this is for hashing only; there is no problem if the integer

+** cannot hold the whole pointer value

+*/

+#define point2uint(p)	((unsigned int)((size_t)(p) & UINT_MAX))

+

+

+

+/* types of 'usual argument conversions' for lua_Number and lua_Integer */

+typedef LUAI_UACNUMBER l_uacNumber;

+typedef LUAI_UACINT l_uacInt;

+

+

+/*

+** Internal assertions for in-house debugging

+*/

+#if defined LUAI_ASSERT

+#undef NDEBUG

+#include <assert.h>

+#define lua_assert(c)           assert(c)

+#endif

+

+#if defined(lua_assert)

+#define check_exp(c,e)		(lua_assert(c), (e))

+/* to avoid problems with conditions too long */

+#define lua_longassert(c)	((c) ? (void)0 : lua_assert(0))

+#else

+#define lua_assert(c)		((void)0)

+#define check_exp(c,e)		(e)

+#define lua_longassert(c)	((void)0)

+#endif

+

+/*

+** assertion for checking API calls

+*/

+#if !defined(luai_apicheck)

+#define luai_apicheck(l,e)	((void)l, lua_assert(e))

+#endif

+

+#define api_check(l,e,msg)	luai_apicheck(l,(e) && msg)

+

+

+/* macro to avoid warnings about unused variables */

+#if !defined(UNUSED)

+#define UNUSED(x)	((void)(x))

+#endif

+

+

+/* type casts (a macro highlights casts in the code) */

+#define cast(t, exp)	((t)(exp))

+

+#define cast_void(i)	cast(void, (i))

+#define cast_voidp(i)	cast(void *, (i))

+#define cast_num(i)	cast(lua_Number, (i))

+#define cast_int(i)	cast(int, (i))

+#define cast_uint(i)	cast(unsigned int, (i))

+#define cast_byte(i)	cast(lu_byte, (i))

+#define cast_uchar(i)	cast(unsigned char, (i))

+#define cast_char(i)	cast(char, (i))

+#define cast_charp(i)	cast(char *, (i))

+#define cast_sizet(i)	cast(size_t, (i))

+

+

+/* cast a signed lua_Integer to lua_Unsigned */

+#if !defined(l_castS2U)

+#define l_castS2U(i)	((lua_Unsigned)(i))

+#endif

+

+/*

+** cast a lua_Unsigned to a signed lua_Integer; this cast is

+** not strict ISO C, but two-complement architectures should

+** work fine.

+*/

+#if !defined(l_castU2S)

+#define l_castU2S(i)	((lua_Integer)(i))

+#endif

+

+

+/*

+** macros to improve jump prediction (used mainly for error handling)

+*/

+#if !defined(likely)

+

+#if defined(__GNUC__)

+#define likely(x)	(__builtin_expect(((x) != 0), 1))

+#define unlikely(x)	(__builtin_expect(((x) != 0), 0))

+#else

+#define likely(x)	(x)

+#define unlikely(x)	(x)

+#endif

+

+#endif

+

+

+/*

+** non-return type

+*/

+#if !defined(l_noret)

+

+#if defined(__GNUC__)

+#define l_noret		void __attribute__((noreturn))

+#elif defined(_MSC_VER) && _MSC_VER >= 1200

+#define l_noret		void __declspec(noreturn)

+#else

+#define l_noret		void

+#endif

+

+#endif

+

+

+/*

+** type for virtual-machine instructions;

+** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)

+*/

+#if LUAI_IS32INT

+typedef unsigned int l_uint32;

+#else

+typedef unsigned long l_uint32;

+#endif

+

+typedef l_uint32 Instruction;

+

+

+

+/*

+** Maximum length for short strings, that is, strings that are

+** internalized. (Cannot be smaller than reserved words or tags for

+** metamethods, as these strings must be internalized;

+** #("function") = 8, #("__newindex") = 10.)

+*/

+#if !defined(LUAI_MAXSHORTLEN)

+#define LUAI_MAXSHORTLEN	40

+#endif

+

+

+/*

+** Initial size for the string table (must be power of 2).

+** The Lua core alone registers ~50 strings (reserved words +

+** metaevent keys + a few others). Libraries would typically add

+** a few dozens more.

+*/

+#if !defined(MINSTRTABSIZE)

+#define MINSTRTABSIZE	128

+#endif

+

+

+/*

+** Size of cache for strings in the API. 'N' is the number of

+** sets (better be a prime) and "M" is the size of each set (M == 1

+** makes a direct cache.)

+*/

+#if !defined(STRCACHE_N)

+#define STRCACHE_N		53

+#define STRCACHE_M		2

+#endif

+

+

+/* minimum size for string buffer */

+#if !defined(LUA_MINBUFFER)

+#define LUA_MINBUFFER	32

+#endif

+

+

+/*

+** Maximum depth for nested C calls, syntactical nested non-terminals,

+** and other features implemented through recursion in C. (Value must

+** fit in a 16-bit unsigned integer. It must also be compatible with

+** the size of the C stack.)

+*/

+#if !defined(LUAI_MAXCCALLS)

+#define LUAI_MAXCCALLS		200

+#endif

+

+

+/*

+** macros that are executed whenever program enters the Lua core

+** ('lua_lock') and leaves the core ('lua_unlock')

+*/

+#if !defined(lua_lock)

+#define lua_lock(L)	((void) 0)

+#define lua_unlock(L)	((void) 0)

+#endif

+

+/*

+** macro executed during Lua functions at points where the

+** function can yield.

+*/

+#if !defined(luai_threadyield)

+#define luai_threadyield(L)	{lua_unlock(L); lua_lock(L);}

+#endif

+

+

+/*

+** these macros allow user-specific actions when a thread is

+** created/deleted/resumed/yielded.

+*/

+#if !defined(luai_userstateopen)

+#define luai_userstateopen(L)		((void)L)

+#endif

+

+#if !defined(luai_userstateclose)

+#define luai_userstateclose(L)		((void)L)

+#endif

+

+#if !defined(luai_userstatethread)

+#define luai_userstatethread(L,L1)	((void)L)

+#endif

+

+#if !defined(luai_userstatefree)

+#define luai_userstatefree(L,L1)	((void)L)

+#endif

+

+#if !defined(luai_userstateresume)

+#define luai_userstateresume(L,n)	((void)L)

+#endif

+

+#if !defined(luai_userstateyield)

+#define luai_userstateyield(L,n)	((void)L)

+#endif

+

+

+

+/*

+** The luai_num* macros define the primitive operations over numbers.

+*/

+

+/* floor division (defined as 'floor(a/b)') */

+#if !defined(luai_numidiv)

+#define luai_numidiv(L,a,b)     ((void)L, l_floor(luai_numdiv(L,a,b)))

+#endif

+

+/* float division */

+#if !defined(luai_numdiv)

+#define luai_numdiv(L,a,b)      ((a)/(b))

+#endif

+

+/*

+** modulo: defined as 'a - floor(a/b)*b'; the direct computation

+** using this definition has several problems with rounding errors,

+** so it is better to use 'fmod'. 'fmod' gives the result of

+** 'a - trunc(a/b)*b', and therefore must be corrected when

+** 'trunc(a/b) ~= floor(a/b)'. That happens when the division has a

+** non-integer negative result: non-integer result is equivalent to

+** a non-zero remainder 'm'; negative result is equivalent to 'a' and

+** 'b' with different signs, or 'm' and 'b' with different signs

+** (as the result 'm' of 'fmod' has the same sign of 'a').

+*/

+#if !defined(luai_nummod)

+#define luai_nummod(L,a,b,m)  \

+  { (void)L; (m) = l_mathop(fmod)(a,b); \

+    if (((m) > 0) ? (b) < 0 : ((m) < 0 && (b) > 0)) (m) += (b); }

+#endif

+

+/* exponentiation */

+#if !defined(luai_numpow)

+#define luai_numpow(L,a,b)  \

+  ((void)L, (b == 2) ? (a)*(a) : l_mathop(pow)(a,b))

+#endif

+

+/* the others are quite standard operations */

+#if !defined(luai_numadd)

+#define luai_numadd(L,a,b)      ((a)+(b))

+#define luai_numsub(L,a,b)      ((a)-(b))

+#define luai_nummul(L,a,b)      ((a)*(b))

+#define luai_numunm(L,a)        (-(a))

+#define luai_numeq(a,b)         ((a)==(b))

+#define luai_numlt(a,b)         ((a)<(b))

+#define luai_numle(a,b)         ((a)<=(b))

+#define luai_numgt(a,b)         ((a)>(b))

+#define luai_numge(a,b)         ((a)>=(b))

+#define luai_numisnan(a)        (!luai_numeq((a), (a)))

+#endif

+

+

+

+

+

+/*

+** macro to control inclusion of some hard tests on stack reallocation

+*/

+#if !defined(HARDSTACKTESTS)

+#define condmovestack(L,pre,pos)	((void)0)

+#else

+/* realloc stack keeping its size */

+#define condmovestack(L,pre,pos)  \

+  { int sz_ = stacksize(L); pre; luaD_reallocstack((L), sz_, 0); pos; }

+#endif

+

+#if !defined(HARDMEMTESTS)

+#define condchangemem(L,pre,pos)	((void)0)

+#else

+#define condchangemem(L,pre,pos)  \

+	{ if (G(L)->gcrunning) { pre; luaC_fullgc(L, 0); pos; } }

+#endif

+

+#endif

--- /dev/null

+++ b/lmathlib.c

@@ -1,0 +1,763 @@

+/*

+** $Id: lmathlib.c $

+** Standard mathematical library

+** See Copyright Notice in lua.h

+*/

+

+#define lmathlib_c

+#define LUA_LIB

+

+#include "lprefix.h"

+

+

+#include <float.h>

+#include <limits.h>

+#include <math.h>

+#include <stdlib.h>

+#include <time.h>

+

+#include "lua.h"

+

+#include "lauxlib.h"

+#include "lualib.h"

+

+

+#undef PI

+#define PI	(l_mathop(3.141592653589793238462643383279502884))

+

+

+static int math_abs (lua_State *L) {

+  if (lua_isinteger(L, 1)) {

+    lua_Integer n = lua_tointeger(L, 1);

+    if (n < 0) n = (lua_Integer)(0u - (lua_Unsigned)n);

+    lua_pushinteger(L, n);

+  }

+  else

+    lua_pushnumber(L, l_mathop(fabs)(luaL_checknumber(L, 1)));

+  return 1;

+}

+

+static int math_sin (lua_State *L) {

+  lua_pushnumber(L, l_mathop(sin)(luaL_checknumber(L, 1)));

+  return 1;

+}

+

+static int math_cos (lua_State *L) {

+  lua_pushnumber(L, l_mathop(cos)(luaL_checknumber(L, 1)));

+  return 1;

+}

+

+static int math_tan (lua_State *L) {

+  lua_pushnumber(L, l_mathop(tan)(luaL_checknumber(L, 1)));

+  return 1;

+}

+

+static int math_asin (lua_State *L) {

+  lua_pushnumber(L, l_mathop(asin)(luaL_checknumber(L, 1)));

+  return 1;

+}

+

+static int math_acos (lua_State *L) {

+  lua_pushnumber(L, l_mathop(acos)(luaL_checknumber(L, 1)));

+  return 1;

+}

+

+static int math_atan (lua_State *L) {

+  lua_Number y = luaL_checknumber(L, 1);

+  lua_Number x = luaL_optnumber(L, 2, 1);

+  lua_pushnumber(L, l_mathop(atan2)(y, x));

+  return 1;

+}

+

+

+static int math_toint (lua_State *L) {

+  int valid;

+  lua_Integer n = lua_tointegerx(L, 1, &valid);

+  if (valid)

+    lua_pushinteger(L, n);

+  else {

+    luaL_checkany(L, 1);

+    luaL_pushfail(L);  /* value is not convertible to integer */

+  }

+  return 1;

+}

+

+

+static void pushnumint (lua_State *L, lua_Number d) {

+  lua_Integer n;

+  if (lua_numbertointeger(d, &n))  /* does 'd' fit in an integer? */

+    lua_pushinteger(L, n);  /* result is integer */

+  else

+    lua_pushnumber(L, d);  /* result is float */

+}

+

+

+static int math_floor (lua_State *L) {

+  if (lua_isinteger(L, 1))

+    lua_settop(L, 1);  /* integer is its own floor */

+  else {

+    lua_Number d = l_mathop(floor)(luaL_checknumber(L, 1));

+    pushnumint(L, d);

+  }

+  return 1;

+}

+

+

+static int math_ceil (lua_State *L) {

+  if (lua_isinteger(L, 1))

+    lua_settop(L, 1);  /* integer is its own ceil */

+  else {

+    lua_Number d = l_mathop(ceil)(luaL_checknumber(L, 1));

+    pushnumint(L, d);

+  }

+  return 1;

+}

+

+

+static int math_fmod (lua_State *L) {

+  if (lua_isinteger(L, 1) && lua_isinteger(L, 2)) {

+    lua_Integer d = lua_tointeger(L, 2);

+    if ((lua_Unsigned)d + 1u <= 1u) {  /* special cases: -1 or 0 */

+      luaL_argcheck(L, d != 0, 2, "zero");

+      lua_pushinteger(L, 0);  /* avoid overflow with 0x80000... / -1 */

+    }

+    else

+      lua_pushinteger(L, lua_tointeger(L, 1) % d);

+  }

+  else

+    lua_pushnumber(L, l_mathop(fmod)(luaL_checknumber(L, 1),

+                                     luaL_checknumber(L, 2)));

+  return 1;

+}

+

+

+/*

+** next function does not use 'modf', avoiding problems with 'double*'

+** (which is not compatible with 'float*') when lua_Number is not

+** 'double'.

+*/

+static int math_modf (lua_State *L) {

+  if (lua_isinteger(L ,1)) {

+    lua_settop(L, 1);  /* number is its own integer part */

+    lua_pushnumber(L, 0);  /* no fractional part */

+  }

+  else {

+    lua_Number n = luaL_checknumber(L, 1);

+    /* integer part (rounds toward zero) */

+    lua_Number ip = (n < 0) ? l_mathop(ceil)(n) : l_mathop(floor)(n);

+    pushnumint(L, ip);

+    /* fractional part (test needed for inf/-inf) */

+    lua_pushnumber(L, (n == ip) ? l_mathop(0.0) : (n - ip));

+  }

+  return 2;

+}

+

+

+static int math_sqrt (lua_State *L) {

+  lua_pushnumber(L, l_mathop(sqrt)(luaL_checknumber(L, 1)));

+  return 1;

+}

+

+

+static int math_ult (lua_State *L) {

+  lua_Integer a = luaL_checkinteger(L, 1);

+  lua_Integer b = luaL_checkinteger(L, 2);

+  lua_pushboolean(L, (lua_Unsigned)a < (lua_Unsigned)b);

+  return 1;

+}

+

+static int math_log (lua_State *L) {

+  lua_Number x = luaL_checknumber(L, 1);

+  lua_Number res;

+  if (lua_isnoneornil(L, 2))

+    res = l_mathop(log)(x);

+  else {

+    lua_Number base = luaL_checknumber(L, 2);

+#if !defined(LUA_USE_C89)

+    if (base == l_mathop(2.0))

+      res = l_mathop(log2)(x); else

+#endif

+    if (base == l_mathop(10.0))

+      res = l_mathop(log10)(x);

+    else

+      res = l_mathop(log)(x)/l_mathop(log)(base);

+  }

+  lua_pushnumber(L, res);

+  return 1;

+}

+

+static int math_exp (lua_State *L) {

+  lua_pushnumber(L, l_mathop(exp)(luaL_checknumber(L, 1)));

+  return 1;

+}

+

+static int math_deg (lua_State *L) {

+  lua_pushnumber(L, luaL_checknumber(L, 1) * (l_mathop(180.0) / PI));

+  return 1;

+}

+

+static int math_rad (lua_State *L) {

+  lua_pushnumber(L, luaL_checknumber(L, 1) * (PI / l_mathop(180.0)));

+  return 1;

+}

+

+

+static int math_min (lua_State *L) {

+  int n = lua_gettop(L);  /* number of arguments */

+  int imin = 1;  /* index of current minimum value */

+  int i;

+  luaL_argcheck(L, n >= 1, 1, "value expected");

+  for (i = 2; i <= n; i++) {

+    if (lua_compare(L, i, imin, LUA_OPLT))

+      imin = i;

+  }

+  lua_pushvalue(L, imin);

+  return 1;

+}

+

+

+static int math_max (lua_State *L) {

+  int n = lua_gettop(L);  /* number of arguments */

+  int imax = 1;  /* index of current maximum value */

+  int i;

+  luaL_argcheck(L, n >= 1, 1, "value expected");

+  for (i = 2; i <= n; i++) {

+    if (lua_compare(L, imax, i, LUA_OPLT))

+      imax = i;

+  }

+  lua_pushvalue(L, imax);

+  return 1;

+}

+

+

+static int math_type (lua_State *L) {

+  if (lua_type(L, 1) == LUA_TNUMBER)

+    lua_pushstring(L, (lua_isinteger(L, 1)) ? "integer" : "float");

+  else {

+    luaL_checkany(L, 1);

+    luaL_pushfail(L);

+  }

+  return 1;

+}

+

+

+

+/*

+** {==================================================================

+** Pseudo-Random Number Generator based on 'xoshiro256**'.

+** ===================================================================

+*/

+

+/* number of binary digits in the mantissa of a float */

+#define FIGS	l_floatatt(MANT_DIG)

+

+#if FIGS > 64

+/* there are only 64 random bits; use them all */

+#undef FIGS

+#define FIGS	64

+#endif

+

+

+/*

+** LUA_RAND32 forces the use of 32-bit integers in the implementation

+** of the PRN generator (mainly for testing).

+*/

+#if !defined(LUA_RAND32) && !defined(Rand64)

+

+/* try to find an integer type with at least 64 bits */

+

+#if (ULONG_MAX >> 31 >> 31) >= 3

+

+/* 'long' has at least 64 bits */

+#define Rand64		unsigned long

+

+#elif !defined(LUA_USE_C89) && defined(LLONG_MAX)

+

+/* there is a 'long long' type (which must have at least 64 bits) */

+#define Rand64		unsigned long long

+

+#elif (LUA_MAXUNSIGNED >> 31 >> 31) >= 3

+

+/* 'lua_Integer' has at least 64 bits */

+#define Rand64		lua_Unsigned

+

+#endif

+

+#endif

+

+

+#if defined(Rand64)  /* { */

+

+/*

+** Standard implementation, using 64-bit integers.

+** If 'Rand64' has more than 64 bits, the extra bits do not interfere

+** with the 64 initial bits, except in a right shift. Moreover, the

+** final result has to discard the extra bits.

+*/

+

+/* avoid using extra bits when needed */

+#define trim64(x)	((x) & 0xffffffffffffffffu)

+

+

+/* rotate left 'x' by 'n' bits */

+static Rand64 rotl (Rand64 x, int n) {

+  return (x << n) | (trim64(x) >> (64 - n));

+}

+

+static Rand64 nextrand (Rand64 *state) {

+  Rand64 state0 = state[0];

+  Rand64 state1 = state[1];

+  Rand64 state2 = state[2] ^ state0;

+  Rand64 state3 = state[3] ^ state1;

+  Rand64 res = rotl(state1 * 5, 7) * 9;

+  state[0] = state0 ^ state3;

+  state[1] = state1 ^ state2;

+  state[2] = state2 ^ (state1 << 17);

+  state[3] = rotl(state3, 45);

+  return res;

+}

+

+

+/* must take care to not shift stuff by more than 63 slots */

+

+

+/*

+** Convert bits from a random integer into a float in the

+** interval [0,1), getting the higher FIG bits from the

+** random unsigned integer and converting that to a float.

+*/

+

+/* must throw out the extra (64 - FIGS) bits */

+#define shift64_FIG	(64 - FIGS)

+

+/* to scale to [0, 1), multiply by scaleFIG = 2^(-FIGS) */

+#define scaleFIG	(l_mathop(0.5) / ((Rand64)1 << (FIGS - 1)))

+

+static lua_Number I2d (Rand64 x) {

+  return (lua_Number)(trim64(x) >> shift64_FIG) * scaleFIG;

+}

+

+/* convert a 'Rand64' to a 'lua_Unsigned' */

+#define I2UInt(x)	((lua_Unsigned)trim64(x))

+

+/* convert a 'lua_Unsigned' to a 'Rand64' */

+#define Int2I(x)	((Rand64)(x))

+

+

+#else	/* no 'Rand64'   }{ */

+

+/* get an integer with at least 32 bits */

+#if LUAI_IS32INT

+typedef unsigned int lu_int32;

+#else

+typedef unsigned long lu_int32;

+#endif

+

+

+/*

+** Use two 32-bit integers to represent a 64-bit quantity.

+*/

+typedef struct Rand64 {

+  lu_int32 h;  /* higher half */

+  lu_int32 l;  /* lower half */

+} Rand64;

+

+

+/*

+** If 'lu_int32' has more than 32 bits, the extra bits do not interfere

+** with the 32 initial bits, except in a right shift and comparisons.

+** Moreover, the final result has to discard the extra bits.

+*/

+

+/* avoid using extra bits when needed */

+#define trim32(x)	((x) & 0xffffffffu)

+

+

+/*

+** basic operations on 'Rand64' values

+*/

+

+/* build a new Rand64 value */

+static Rand64 packI (lu_int32 h, lu_int32 l) {

+  Rand64 result;

+  result.h = h;

+  result.l = l;

+  return result;

+}

+

+/* return i << n */

+static Rand64 Ishl (Rand64 i, int n) {

+  lua_assert(n > 0 && n < 32);

+  return packI((i.h << n) | (trim32(i.l) >> (32 - n)), i.l << n);

+}

+

+/* i1 ^= i2 */

+static void Ixor (Rand64 *i1, Rand64 i2) {

+  i1->h ^= i2.h;

+  i1->l ^= i2.l;

+}

+

+/* return i1 + i2 */

+static Rand64 Iadd (Rand64 i1, Rand64 i2) {

+  Rand64 result = packI(i1.h + i2.h, i1.l + i2.l);

+  if (trim32(result.l) < trim32(i1.l))  /* carry? */

+    result.h++;

+  return result;

+}

+

+/* return i * 5 */

+static Rand64 times5 (Rand64 i) {

+  return Iadd(Ishl(i, 2), i);  /* i * 5 == (i << 2) + i */

+}

+

+/* return i * 9 */

+static Rand64 times9 (Rand64 i) {

+  return Iadd(Ishl(i, 3), i);  /* i * 9 == (i << 3) + i */

+}

+

+/* return 'i' rotated left 'n' bits */

+static Rand64 rotl (Rand64 i, int n) {

+  lua_assert(n > 0 && n < 32);

+  return packI((i.h << n) | (trim32(i.l) >> (32 - n)),

+               (trim32(i.h) >> (32 - n)) | (i.l << n));

+}

+

+/* for offsets larger than 32, rotate right by 64 - offset */

+static Rand64 rotl1 (Rand64 i, int n) {

+  lua_assert(n > 32 && n < 64);

+  n = 64 - n;

+  return packI((trim32(i.h) >> n) | (i.l << (32 - n)),

+               (i.h << (32 - n)) | (trim32(i.l) >> n));

+}

+

+/*

+** implementation of 'xoshiro256**' algorithm on 'Rand64' values

+*/

+static Rand64 nextrand (Rand64 *state) {

+  Rand64 res = times9(rotl(times5(state[1]), 7));

+  Rand64 t = Ishl(state[1], 17);

+  Ixor(&state[2], state[0]);

+  Ixor(&state[3], state[1]);

+  Ixor(&state[1], state[2]);

+  Ixor(&state[0], state[3]);

+  Ixor(&state[2], t);

+  state[3] = rotl1(state[3], 45);

+  return res;

+}

+

+

+/*

+** Converts a 'Rand64' into a float.

+*/

+

+/* an unsigned 1 with proper type */

+#define UONE		((lu_int32)1)

+

+

+#if FIGS <= 32

+

+/* 2^(-FIGS) */

+#define scaleFIG       (l_mathop(0.5) / (UONE << (FIGS - 1)))

+

+/*

+** get up to 32 bits from higher half, shifting right to

+** throw out the extra bits.

+*/

+static lua_Number I2d (Rand64 x) {

+  lua_Number h = (lua_Number)(trim32(x.h) >> (32 - FIGS));

+  return h * scaleFIG;

+}

+

+#else	/* 32 < FIGS <= 64 */

+

+/* must take care to not shift stuff by more than 31 slots */

+

+/* 2^(-FIGS) = 1.0 / 2^30 / 2^3 / 2^(FIGS-33) */

+#define scaleFIG  \

+	((lua_Number)1.0 / (UONE << 30) / 8.0 / (UONE << (FIGS - 33)))

+

+/*

+** use FIGS - 32 bits from lower half, throwing out the other

+** (32 - (FIGS - 32)) = (64 - FIGS) bits

+*/

+#define shiftLOW	(64 - FIGS)

+

+/*

+** higher 32 bits go after those (FIGS - 32) bits: shiftHI = 2^(FIGS - 32)

+*/

+#define shiftHI		((lua_Number)(UONE << (FIGS - 33)) * 2.0)

+

+

+static lua_Number I2d (Rand64 x) {

+  lua_Number h = (lua_Number)trim32(x.h) * shiftHI;

+  lua_Number l = (lua_Number)(trim32(x.l) >> shiftLOW);

+  return (h + l) * scaleFIG;

+}

+

+#endif

+

+

+/* convert a 'Rand64' to a 'lua_Unsigned' */

+static lua_Unsigned I2UInt (Rand64 x) {

+  return ((lua_Unsigned)trim32(x.h) << 31 << 1) | (lua_Unsigned)trim32(x.l);

+}

+

+/* convert a 'lua_Unsigned' to a 'Rand64' */

+static Rand64 Int2I (lua_Unsigned n) {

+  return packI((lu_int32)(n >> 31 >> 1), (lu_int32)n);

+}

+

+#endif  /* } */

+

+

+/*

+** A state uses four 'Rand64' values.

+*/

+typedef struct {

+  Rand64 s[4];

+} RanState;

+

+

+/*

+** Project the random integer 'ran' into the interval [0, n].

+** Because 'ran' has 2^B possible values, the projection can only be

+** uniform when the size of the interval is a power of 2 (exact

+** division). Otherwise, to get a uniform projection into [0, n], we

+** first compute 'lim', the smallest Mersenne number not smaller than

+** 'n'. We then project 'ran' into the interval [0, lim].  If the result

+** is inside [0, n], we are done. Otherwise, we try with another 'ran',

+** until we have a result inside the interval.

+*/

+static lua_Unsigned project (lua_Unsigned ran, lua_Unsigned n,

+                             RanState *state) {

+  if ((n & (n + 1)) == 0)  /* is 'n + 1' a power of 2? */

+    return ran & n;  /* no bias */

+  else {

+    lua_Unsigned lim = n;

+    /* compute the smallest (2^b - 1) not smaller than 'n' */

+    lim |= (lim >> 1);

+    lim |= (lim >> 2);

+    lim |= (lim >> 4);

+    lim |= (lim >> 8);

+    lim |= (lim >> 16);

+#if (LUA_MAXUNSIGNED >> 31) >= 3

+    lim |= (lim >> 32);  /* integer type has more than 32 bits */

+#endif

+    lua_assert((lim & (lim + 1)) == 0  /* 'lim + 1' is a power of 2, */

+      && lim >= n  /* not smaller than 'n', */

+      && (lim >> 1) < n);  /* and it is the smallest one */

+    while ((ran &= lim) > n)  /* project 'ran' into [0..lim] */

+      ran = I2UInt(nextrand(state->s));  /* not inside [0..n]? try again */

+    return ran;

+  }

+}

+

+

+static int math_random (lua_State *L) {

+  lua_Integer low, up;

+  lua_Unsigned p;

+  RanState *state = (RanState *)lua_touserdata(L, lua_upvalueindex(1));

+  Rand64 rv = nextrand(state->s);  /* next pseudo-random value */

+  switch (lua_gettop(L)) {  /* check number of arguments */

+    case 0: {  /* no arguments */

+      lua_pushnumber(L, I2d(rv));  /* float between 0 and 1 */

+      return 1;

+    }

+    case 1: {  /* only upper limit */

+      low = 1;

+      up = luaL_checkinteger(L, 1);

+      if (up == 0) {  /* single 0 as argument? */

+        lua_pushinteger(L, I2UInt(rv));  /* full random integer */

+        return 1;

+      }

+      break;

+    }

+    case 2: {  /* lower and upper limits */

+      low = luaL_checkinteger(L, 1);

+      up = luaL_checkinteger(L, 2);

+      break;

+    }

+    default: return luaL_error(L, "wrong number of arguments");

+  }

+  /* random integer in the interval [low, up] */

+  luaL_argcheck(L, low <= up, 1, "interval is empty");

+  /* project random integer into the interval [0, up - low] */

+  p = project(I2UInt(rv), (lua_Unsigned)up - (lua_Unsigned)low, state);

+  lua_pushinteger(L, p + (lua_Unsigned)low);

+  return 1;

+}

+

+

+static void setseed (lua_State *L, Rand64 *state,

+                     lua_Unsigned n1, lua_Unsigned n2) {

+  int i;

+  state[0] = Int2I(n1);

+  state[1] = Int2I(0xff);  /* avoid a zero state */

+  state[2] = Int2I(n2);

+  state[3] = Int2I(0);

+  for (i = 0; i < 16; i++)

+    nextrand(state);  /* discard initial values to "spread" seed */

+  lua_pushinteger(L, n1);

+  lua_pushinteger(L, n2);

+}

+

+

+/*

+** Set a "random" seed. To get some randomness, use the current time

+** and the address of 'L' (in case the machine does address space layout

+** randomization).

+*/

+static void randseed (lua_State *L, RanState *state) {

+  lua_Unsigned seed1 = (lua_Unsigned)time(NULL);

+  lua_Unsigned seed2 = (lua_Unsigned)(size_t)L;

+  setseed(L, state->s, seed1, seed2);

+}

+

+

+static int math_randomseed (lua_State *L) {

+  RanState *state = (RanState *)lua_touserdata(L, lua_upvalueindex(1));

+  if (lua_isnone(L, 1)) {

+    randseed(L, state);

+  }

+  else {

+    lua_Integer n1 = luaL_checkinteger(L, 1);

+    lua_Integer n2 = luaL_optinteger(L, 2, 0);

+    setseed(L, state->s, n1, n2);

+  }

+  return 2;  /* return seeds */

+}

+

+

+static const luaL_Reg randfuncs[] = {

+  {"random", math_random},

+  {"randomseed", math_randomseed},

+  {NULL, NULL}

+};

+

+

+/*

+** Register the random functions and initialize their state.

+*/

+static void setrandfunc (lua_State *L) {

+  RanState *state = (RanState *)lua_newuserdatauv(L, sizeof(RanState), 0);

+  randseed(L, state);  /* initialize with a "random" seed */

+  lua_pop(L, 2);  /* remove pushed seeds */

+  luaL_setfuncs(L, randfuncs, 1);

+}

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Deprecated functions (for compatibility only)

+** ===================================================================

+*/

+#if defined(LUA_COMPAT_MATHLIB)

+

+static int math_cosh (lua_State *L) {

+  lua_pushnumber(L, l_mathop(cosh)(luaL_checknumber(L, 1)));

+  return 1;

+}

+

+static int math_sinh (lua_State *L) {

+  lua_pushnumber(L, l_mathop(sinh)(luaL_checknumber(L, 1)));

+  return 1;

+}

+

+static int math_tanh (lua_State *L) {

+  lua_pushnumber(L, l_mathop(tanh)(luaL_checknumber(L, 1)));

+  return 1;

+}

+

+static int math_pow (lua_State *L) {

+  lua_Number x = luaL_checknumber(L, 1);

+  lua_Number y = luaL_checknumber(L, 2);

+  lua_pushnumber(L, l_mathop(pow)(x, y));

+  return 1;

+}

+

+static int math_frexp (lua_State *L) {

+  int e;

+  lua_pushnumber(L, l_mathop(frexp)(luaL_checknumber(L, 1), &e));

+  lua_pushinteger(L, e);

+  return 2;

+}

+

+static int math_ldexp (lua_State *L) {

+  lua_Number x = luaL_checknumber(L, 1);

+  int ep = (int)luaL_checkinteger(L, 2);

+  lua_pushnumber(L, l_mathop(ldexp)(x, ep));

+  return 1;

+}

+

+static int math_log10 (lua_State *L) {

+  lua_pushnumber(L, l_mathop(log10)(luaL_checknumber(L, 1)));

+  return 1;

+}

+

+#endif

+/* }================================================================== */

+

+

+

+static const luaL_Reg mathlib[] = {

+  {"abs",   math_abs},

+  {"acos",  math_acos},

+  {"asin",  math_asin},

+  {"atan",  math_atan},

+  {"ceil",  math_ceil},

+  {"cos",   math_cos},

+  {"deg",   math_deg},

+  {"exp",   math_exp},

+  {"tointeger", math_toint},

+  {"floor", math_floor},

+  {"fmod",   math_fmod},

+  {"ult",   math_ult},

+  {"log",   math_log},

+  {"max",   math_max},

+  {"min",   math_min},

+  {"modf",   math_modf},

+  {"rad",   math_rad},

+  {"sin",   math_sin},

+  {"sqrt",  math_sqrt},

+  {"tan",   math_tan},

+  {"type", math_type},

+#if defined(LUA_COMPAT_MATHLIB)

+  {"atan2", math_atan},

+  {"cosh",   math_cosh},

+  {"sinh",   math_sinh},

+  {"tanh",   math_tanh},

+  {"pow",   math_pow},

+  {"frexp", math_frexp},

+  {"ldexp", math_ldexp},

+  {"log10", math_log10},

+#endif

+  /* placeholders */

+  {"random", NULL},

+  {"randomseed", NULL},

+  {"pi", NULL},

+  {"huge", NULL},

+  {"maxinteger", NULL},

+  {"mininteger", NULL},

+  {NULL, NULL}

+};

+

+

+/*

+** Open math library

+*/

+LUAMOD_API int luaopen_math (lua_State *L) {

+  luaL_newlib(L, mathlib);

+  lua_pushnumber(L, PI);

+  lua_setfield(L, -2, "pi");

+  lua_pushnumber(L, (lua_Number)HUGE_VAL);

+  lua_setfield(L, -2, "huge");

+  lua_pushinteger(L, LUA_MAXINTEGER);

+  lua_setfield(L, -2, "maxinteger");

+  lua_pushinteger(L, LUA_MININTEGER);

+  lua_setfield(L, -2, "mininteger");

+  setrandfunc(L);

+  return 1;

+}

+

--- /dev/null

+++ b/lmem.c

@@ -1,0 +1,202 @@

+/*

+** $Id: lmem.c $

+** Interface to Memory Manager

+** See Copyright Notice in lua.h

+*/

+

+#define lmem_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <stddef.h>

+

+#include "lua.h"

+

+#include "ldebug.h"

+#include "ldo.h"

+#include "lgc.h"

+#include "lmem.h"

+#include "lobject.h"

+#include "lstate.h"

+

+

+#if defined(EMERGENCYGCTESTS)

+/*

+** First allocation will fail whenever not building initial state

+** and not shrinking a block. (This fail will trigger 'tryagain' and

+** a full GC cycle at every allocation.)

+*/

+static void *firsttry (global_State *g, void *block, size_t os, size_t ns) {

+  if (ttisnil(&g->nilvalue) && ns > os)

+    return NULL;  /* fail */

+  else  /* normal allocation */

+    return (*g->frealloc)(g->ud, block, os, ns);

+}

+#else

+#define firsttry(g,block,os,ns)    ((*g->frealloc)(g->ud, block, os, ns))

+#endif

+

+

+

+

+

+/*

+** About the realloc function:

+** void *frealloc (void *ud, void *ptr, size_t osize, size_t nsize);

+** ('osize' is the old size, 'nsize' is the new size)

+**

+** - frealloc(ud, p, x, 0) frees the block 'p' and returns NULL.

+** Particularly, frealloc(ud, NULL, 0, 0) does nothing,

+** which is equivalent to free(NULL) in ISO C.

+**

+** - frealloc(ud, NULL, x, s) creates a new block of size 's'

+** (no matter 'x'). Returns NULL if it cannot create the new block.

+**

+** - otherwise, frealloc(ud, b, x, y) reallocates the block 'b' from

+** size 'x' to size 'y'. Returns NULL if it cannot reallocate the

+** block to the new size.

+*/

+

+

+

+

+/*

+** {==================================================================

+** Functions to allocate/deallocate arrays for the Parser

+** ===================================================================

+*/

+

+/*

+** Minimum size for arrays during parsing, to avoid overhead of

+** reallocating to size 1, then 2, and then 4. All these arrays

+** will be reallocated to exact sizes or erased when parsing ends.

+*/

+#define MINSIZEARRAY	4

+

+

+void *luaM_growaux_ (lua_State *L, void *block, int nelems, int *psize,

+                     int size_elems, int limit, const char *what) {

+  void *newblock;

+  int size = *psize;

+  if (nelems + 1 <= size)  /* does one extra element still fit? */

+    return block;  /* nothing to be done */

+  if (size >= limit / 2) {  /* cannot double it? */

+    if (unlikely(size >= limit))  /* cannot grow even a little? */

+      luaG_runerror(L, "too many %s (limit is %d)", what, limit);

+    size = limit;  /* still have at least one free place */

+  }

+  else {

+    size *= 2;

+    if (size < MINSIZEARRAY)

+      size = MINSIZEARRAY;  /* minimum size */

+  }

+  lua_assert(nelems + 1 <= size && size <= limit);

+  /* 'limit' ensures that multiplication will not overflow */

+  newblock = luaM_saferealloc_(L, block, cast_sizet(*psize) * size_elems,

+                                         cast_sizet(size) * size_elems);

+  *psize = size;  /* update only when everything else is OK */

+  return newblock;

+}

+

+

+/*

+** In prototypes, the size of the array is also its number of

+** elements (to save memory). So, if it cannot shrink an array

+** to its number of elements, the only option is to raise an

+** error.

+*/

+void *luaM_shrinkvector_ (lua_State *L, void *block, int *size,

+                          int final_n, int size_elem) {

+  void *newblock;

+  size_t oldsize = cast_sizet((*size) * size_elem);

+  size_t newsize = cast_sizet(final_n * size_elem);

+  lua_assert(newsize <= oldsize);

+  newblock = luaM_saferealloc_(L, block, oldsize, newsize);

+  *size = final_n;

+  return newblock;

+}

+

+/* }================================================================== */

+

+

+l_noret luaM_toobig (lua_State *L) {

+  luaG_runerror(L, "memory allocation error: block too big");

+}

+

+

+/*

+** Free memory

+*/

+void luaM_free_ (lua_State *L, void *block, size_t osize) {

+  global_State *g = G(L);

+  lua_assert((osize == 0) == (block == NULL));

+  (*g->frealloc)(g->ud, block, osize, 0);

+  g->GCdebt -= osize;

+}

+

+

+/*

+** In case of allocation fail, this function will call the GC to try

+** to free some memory and then try the allocation again.

+** (It should not be called when shrinking a block, because then the

+** interpreter may be in the middle of a collection step.)

+*/

+static void *tryagain (lua_State *L, void *block,

+                       size_t osize, size_t nsize) {

+  global_State *g = G(L);

+  if (ttisnil(&g->nilvalue)) {  /* is state fully build? */

+    luaC_fullgc(L, 1);  /* try to free some memory... */

+    return (*g->frealloc)(g->ud, block, osize, nsize);  /* try again */

+  }

+  else return NULL;  /* cannot free any memory without a full state */

+}

+

+

+/*

+** Generic allocation routine.

+** If allocation fails while shrinking a block, do not try again; the

+** GC shrinks some blocks and it is not reentrant.

+*/

+void *luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) {

+  void *newblock;

+  global_State *g = G(L);

+  lua_assert((osize == 0) == (block == NULL));

+  newblock = firsttry(g, block, osize, nsize);

+  if (unlikely(newblock == NULL && nsize > 0)) {

+    if (nsize > osize)  /* not shrinking a block? */

+      newblock = tryagain(L, block, osize, nsize);

+    if (newblock == NULL)  /* still no memory? */

+      return NULL;  /* do not update 'GCdebt' */

+  }

+  lua_assert((nsize == 0) == (newblock == NULL));

+  g->GCdebt = (g->GCdebt + nsize) - osize;

+  return newblock;

+}

+

+

+void *luaM_saferealloc_ (lua_State *L, void *block, size_t osize,

+                                                    size_t nsize) {

+  void *newblock = luaM_realloc_(L, block, osize, nsize);

+  if (unlikely(newblock == NULL && nsize > 0))  /* allocation failed? */

+    luaM_error(L);

+  return newblock;

+}

+

+

+void *luaM_malloc_ (lua_State *L, size_t size, int tag) {

+  if (size == 0)

+    return NULL;  /* that's all */

+  else {

+    global_State *g = G(L);

+    void *newblock = firsttry(g, NULL, tag, size);

+    if (unlikely(newblock == NULL)) {

+      newblock = tryagain(L, NULL, tag, size);

+      if (newblock == NULL)

+        luaM_error(L);

+    }

+    g->GCdebt += size;

+    return newblock;

+  }

+}

--- /dev/null

+++ b/lmem.h

@@ -1,0 +1,93 @@

+/*

+** $Id: lmem.h $

+** Interface to Memory Manager

+** See Copyright Notice in lua.h

+*/

+

+#ifndef lmem_h

+#define lmem_h

+

+

+#include <stddef.h>

+

+#include "llimits.h"

+#include "lua.h"

+

+

+#define luaM_error(L)	luaD_throw(L, LUA_ERRMEM)

+

+

+/*

+** This macro tests whether it is safe to multiply 'n' by the size of

+** type 't' without overflows. Because 'e' is always constant, it avoids

+** the runtime division MAX_SIZET/(e).

+** (The macro is somewhat complex to avoid warnings:  The 'sizeof'

+** comparison avoids a runtime comparison when overflow cannot occur.

+** The compiler should be able to optimize the real test by itself, but

+** when it does it, it may give a warning about "comparison is always

+** false due to limited range of data type"; the +1 tricks the compiler,

+** avoiding this warning but also this optimization.)

+*/

+#define luaM_testsize(n,e)  \

+	(sizeof(n) >= sizeof(size_t) && cast_sizet((n)) + 1 > MAX_SIZET/(e))

+

+#define luaM_checksize(L,n,e)  \

+	(luaM_testsize(n,e) ? luaM_toobig(L) : cast_void(0))

+

+

+/*

+** Computes the minimum between 'n' and 'MAX_SIZET/sizeof(t)', so that

+** the result is not larger than 'n' and cannot overflow a 'size_t'

+** when multiplied by the size of type 't'. (Assumes that 'n' is an

+** 'int' or 'unsigned int' and that 'int' is not larger than 'size_t'.)

+*/

+#define luaM_limitN(n,t)  \

+  ((cast_sizet(n) <= MAX_SIZET/sizeof(t)) ? (n) :  \

+     cast_uint((MAX_SIZET/sizeof(t))))

+

+

+/*

+** Arrays of chars do not need any test

+*/

+#define luaM_reallocvchar(L,b,on,n)  \

+  cast_charp(luaM_saferealloc_(L, (b), (on)*sizeof(char), (n)*sizeof(char)))

+

+#define luaM_freemem(L, b, s)	luaM_free_(L, (b), (s))

+#define luaM_free(L, b)		luaM_free_(L, (b), sizeof(*(b)))

+#define luaM_freearray(L, b, n)   luaM_free_(L, (b), (n)*sizeof(*(b)))

+

+#define luaM_new(L,t)		cast(t*, luaM_malloc_(L, sizeof(t), 0))

+#define luaM_newvector(L,n,t)	cast(t*, luaM_malloc_(L, (n)*sizeof(t), 0))

+#define luaM_newvectorchecked(L,n,t) \

+  (luaM_checksize(L,n,sizeof(t)), luaM_newvector(L,n,t))

+

+#define luaM_newobject(L,tag,s)	luaM_malloc_(L, (s), tag)

+

+#define luaM_growvector(L,v,nelems,size,t,limit,e) \

+	((v)=cast(t *, luaM_growaux_(L,v,nelems,&(size),sizeof(t), \

+                         luaM_limitN(limit,t),e)))

+

+#define luaM_reallocvector(L, v,oldn,n,t) \

+   (cast(t *, luaM_realloc_(L, v, cast_sizet(oldn) * sizeof(t), \

+                                  cast_sizet(n) * sizeof(t))))

+

+#define luaM_shrinkvector(L,v,size,fs,t) \

+   ((v)=cast(t *, luaM_shrinkvector_(L, v, &(size), fs, sizeof(t))))

+

+LUAI_FUNC l_noret luaM_toobig (lua_State *L);

+

+/* not to be called directly */

+LUAI_FUNC void *luaM_realloc_ (lua_State *L, void *block, size_t oldsize,

+                                                          size_t size);

+LUAI_FUNC void *luaM_saferealloc_ (lua_State *L, void *block, size_t oldsize,

+                                                              size_t size);

+LUAI_FUNC void luaM_free_ (lua_State *L, void *block, size_t osize);

+LUAI_FUNC void *luaM_growaux_ (lua_State *L, void *block, int nelems,

+                               int *size, int size_elem, int limit,

+                               const char *what);

+LUAI_FUNC void *luaM_shrinkvector_ (lua_State *L, void *block, int *nelem,

+                                    int final_n, int size_elem);

+LUAI_FUNC void *luaM_malloc_ (lua_State *L, size_t size, int tag);

+

+#endif

+

--- /dev/null

+++ b/loadlib.c

@@ -1,0 +1,759 @@

+/*

+** $Id: loadlib.c $

+** Dynamic library loader for Lua

+** See Copyright Notice in lua.h

+**

+** This module contains an implementation of loadlib for Unix systems

+** that have dlfcn, an implementation for Windows, and a stub for other

+** systems.

+*/

+

+#define loadlib_c

+#define LUA_LIB

+

+#include "lprefix.h"

+

+

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "lauxlib.h"

+#include "lualib.h"

+

+

+/*

+** LUA_IGMARK is a mark to ignore all before it when building the

+** luaopen_ function name.

+*/

+#if !defined (LUA_IGMARK)

+#define LUA_IGMARK		"-"

+#endif

+

+

+/*

+** LUA_CSUBSEP is the character that replaces dots in submodule names

+** when searching for a C loader.

+** LUA_LSUBSEP is the character that replaces dots in submodule names

+** when searching for a Lua loader.

+*/

+#if !defined(LUA_CSUBSEP)

+#define LUA_CSUBSEP		LUA_DIRSEP

+#endif

+

+#if !defined(LUA_LSUBSEP)

+#define LUA_LSUBSEP		LUA_DIRSEP

+#endif

+

+

+/* prefix for open functions in C libraries */

+#define LUA_POF		"luaopen_"

+

+/* separator for open functions in C libraries */

+#define LUA_OFSEP	"_"

+

+

+/*

+** key for table in the registry that keeps handles

+** for all loaded C libraries

+*/

+static const char *const CLIBS = "_CLIBS";

+

+#define LIB_FAIL	"open"

+

+

+#define setprogdir(L)           ((void)0)

+

+

+/*

+** Special type equivalent to '(void*)' for functions in gcc

+** (to suppress warnings when converting function pointers)

+*/

+typedef void (*voidf)(void);

+

+

+/*

+** system-dependent functions

+*/

+

+/*

+** unload library 'lib'

+*/

+static void lsys_unloadlib (void *lib);

+

+/*

+** load C library in file 'path'. If 'seeglb', load with all names in

+** the library global.

+** Returns the library; in case of error, returns NULL plus an

+** error string in the stack.

+*/

+static void *lsys_load (lua_State *L, const char *path, int seeglb);

+

+/*

+** Try to find a function named 'sym' in library 'lib'.

+** Returns the function; in case of error, returns NULL plus an

+** error string in the stack.

+*/

+static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym);

+

+

+

+

+#if defined(LUA_USE_DLOPEN)	/* { */

+/*

+** {========================================================================

+** This is an implementation of loadlib based on the dlfcn interface.

+** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD,

+** NetBSD, AIX 4.2, HPUX 11, and  probably most other Unix flavors, at least

+** as an emulation layer on top of native functions.

+** =========================================================================

+*/

+

+#include <dlfcn.h>

+

+/*

+** Macro to convert pointer-to-void* to pointer-to-function. This cast

+** is undefined according to ISO C, but POSIX assumes that it works.

+** (The '__extension__' in gnu compilers is only to avoid warnings.)

+*/

+#if defined(__GNUC__)

+#define cast_func(p) (__extension__ (lua_CFunction)(p))

+#else

+#define cast_func(p) ((lua_CFunction)(p))

+#endif

+

+

+static void lsys_unloadlib (void *lib) {

+  dlclose(lib);

+}

+

+

+static void *lsys_load (lua_State *L, const char *path, int seeglb) {

+  void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : RTLD_LOCAL));

+  if (lib == NULL) lua_pushstring(L, dlerror());

+  return lib;

+}

+

+

+static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {

+  lua_CFunction f = cast_func(dlsym(lib, sym));

+  if (f == NULL) lua_pushstring(L, dlerror());

+  return f;

+}

+

+/* }====================================================== */

+

+

+

+#elif defined(LUA_DL_DLL)	/* }{ */

+/*

+** {======================================================================

+** This is an implementation of loadlib for Windows using native functions.

+** =======================================================================

+*/

+

+#include <windows.h>

+

+

+/*

+** optional flags for LoadLibraryEx

+*/

+#if !defined(LUA_LLE_FLAGS)

+#define LUA_LLE_FLAGS	0

+#endif

+

+

+#undef setprogdir

+

+

+/*

+** Replace in the path (on the top of the stack) any occurrence

+** of LUA_EXEC_DIR with the executable's path.

+*/

+static void setprogdir (lua_State *L) {

+  char buff[MAX_PATH + 1];

+  char *lb;

+  DWORD nsize = sizeof(buff)/sizeof(char);

+  DWORD n = GetModuleFileNameA(NULL, buff, nsize);  /* get exec. name */

+  if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL)

+    luaL_error(L, "unable to get ModuleFileName");

+  else {

+    *lb = '\0';  /* cut name on the last '\\' to get the path */

+    luaL_gsub(L, lua_tostring(L, -1), LUA_EXEC_DIR, buff);

+    lua_remove(L, -2);  /* remove original string */

+  }

+}

+

+

+

+

+static void pusherror (lua_State *L) {

+  int error = GetLastError();

+  char buffer[128];

+  if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,

+      NULL, error, 0, buffer, sizeof(buffer)/sizeof(char), NULL))

+    lua_pushstring(L, buffer);

+  else

+    lua_pushfstring(L, "system error %d\n", error);

+}

+

+static void lsys_unloadlib (void *lib) {

+  FreeLibrary((HMODULE)lib);

+}

+

+

+static void *lsys_load (lua_State *L, const char *path, int seeglb) {

+  HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS);

+  (void)(seeglb);  /* not used: symbols are 'global' by default */

+  if (lib == NULL) pusherror(L);

+  return lib;

+}

+

+

+static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {

+  lua_CFunction f = (lua_CFunction)(voidf)GetProcAddress((HMODULE)lib, sym);

+  if (f == NULL) pusherror(L);

+  return f;

+}

+

+/* }====================================================== */

+

+

+#else				/* }{ */

+/*

+** {======================================================

+** Fallback for other systems

+** =======================================================

+*/

+

+#undef LIB_FAIL

+#define LIB_FAIL	"absent"

+

+

+#define DLMSG	"dynamic libraries not enabled; check your Lua installation"

+

+

+static void lsys_unloadlib (void *lib) {

+  (void)(lib);  /* not used */

+}

+

+

+static void *lsys_load (lua_State *L, const char *path, int seeglb) {

+  (void)(path); (void)(seeglb);  /* not used */

+  lua_pushliteral(L, DLMSG);

+  return NULL;

+}

+

+

+static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {

+  (void)(lib); (void)(sym);  /* not used */

+  lua_pushliteral(L, DLMSG);

+  return NULL;

+}

+

+/* }====================================================== */

+#endif				/* } */

+

+

+/*

+** {==================================================================

+** Set Paths

+** ===================================================================

+*/

+

+/*

+** LUA_PATH_VAR and LUA_CPATH_VAR are the names of the environment

+** variables that Lua check to set its paths.

+*/

+#if !defined(LUA_PATH_VAR)

+#define LUA_PATH_VAR    "LUA_PATH"

+#endif

+

+#if !defined(LUA_CPATH_VAR)

+#define LUA_CPATH_VAR   "LUA_CPATH"

+#endif

+

+

+

+/*

+** return registry.LUA_NOENV as a boolean

+*/

+static int noenv (lua_State *L) {

+  int b;

+  lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");

+  b = lua_toboolean(L, -1);

+  lua_pop(L, 1);  /* remove value */

+  return b;

+}

+

+

+/*

+** Set a path

+*/

+static void setpath (lua_State *L, const char *fieldname,

+                                   const char *envname,

+                                   const char *dft) {

+  const char *dftmark;

+  const char *nver = lua_pushfstring(L, "%s%s", envname, LUA_VERSUFFIX);

+  const char *path = getenv(nver);  /* try versioned name */

+  if (path == NULL)  /* no versioned environment variable? */

+    path = getenv(envname);  /* try unversioned name */

+  if (path == NULL || noenv(L))  /* no environment variable? */

+    lua_pushstring(L, dft);  /* use default */

+  else if ((dftmark = strstr(path, LUA_PATH_SEP LUA_PATH_SEP)) == NULL)

+    lua_pushstring(L, path);  /* nothing to change */

+  else {  /* path contains a ";;": insert default path in its place */

+    size_t len = strlen(path);

+    luaL_Buffer b;

+    luaL_buffinit(L, &b);

+    if (path < dftmark) {  /* is there a prefix before ';;'? */

+      luaL_addlstring(&b, path, dftmark - path);  /* add it */

+      luaL_addchar(&b, *LUA_PATH_SEP);

+    }

+    luaL_addstring(&b, dft);  /* add default */

+    if (dftmark < path + len - 2) {  /* is there a suffix after ';;'? */

+      luaL_addchar(&b, *LUA_PATH_SEP);

+      luaL_addlstring(&b, dftmark + 2, (path + len - 2) - dftmark);

+    }

+    luaL_pushresult(&b);

+  }

+  setprogdir(L);

+  lua_setfield(L, -3, fieldname);  /* package[fieldname] = path value */

+  lua_pop(L, 1);  /* pop versioned variable name ('nver') */

+}

+

+/* }================================================================== */

+

+

+/*

+** return registry.CLIBS[path]

+*/

+static void *checkclib (lua_State *L, const char *path) {

+  void *plib;

+  lua_getfield(L, LUA_REGISTRYINDEX, CLIBS);

+  lua_getfield(L, -1, path);

+  plib = lua_touserdata(L, -1);  /* plib = CLIBS[path] */

+  lua_pop(L, 2);  /* pop CLIBS table and 'plib' */

+  return plib;

+}

+

+

+/*

+** registry.CLIBS[path] = plib        -- for queries

+** registry.CLIBS[#CLIBS + 1] = plib  -- also keep a list of all libraries

+*/

+static void addtoclib (lua_State *L, const char *path, void *plib) {

+  lua_getfield(L, LUA_REGISTRYINDEX, CLIBS);

+  lua_pushlightuserdata(L, plib);

+  lua_pushvalue(L, -1);

+  lua_setfield(L, -3, path);  /* CLIBS[path] = plib */

+  lua_rawseti(L, -2, luaL_len(L, -2) + 1);  /* CLIBS[#CLIBS + 1] = plib */

+  lua_pop(L, 1);  /* pop CLIBS table */

+}

+

+

+/*

+** __gc tag method for CLIBS table: calls 'lsys_unloadlib' for all lib

+** handles in list CLIBS

+*/

+static int gctm (lua_State *L) {

+  lua_Integer n = luaL_len(L, 1);

+  for (; n >= 1; n--) {  /* for each handle, in reverse order */

+    lua_rawgeti(L, 1, n);  /* get handle CLIBS[n] */

+    lsys_unloadlib(lua_touserdata(L, -1));

+    lua_pop(L, 1);  /* pop handle */

+  }

+  return 0;

+}

+

+

+

+/* error codes for 'lookforfunc' */

+#define ERRLIB		1

+#define ERRFUNC		2

+

+/*

+** Look for a C function named 'sym' in a dynamically loaded library

+** 'path'.

+** First, check whether the library is already loaded; if not, try

+** to load it.

+** Then, if 'sym' is '*', return true (as library has been loaded).

+** Otherwise, look for symbol 'sym' in the library and push a

+** C function with that symbol.

+** Return 0 and 'true' or a function in the stack; in case of

+** errors, return an error code and an error message in the stack.

+*/

+static int lookforfunc (lua_State *L, const char *path, const char *sym) {

+  void *reg = checkclib(L, path);  /* check loaded C libraries */

+  if (reg == NULL) {  /* must load library? */

+    reg = lsys_load(L, path, *sym == '*');  /* global symbols if 'sym'=='*' */

+    if (reg == NULL) return ERRLIB;  /* unable to load library */

+    addtoclib(L, path, reg);

+  }

+  if (*sym == '*') {  /* loading only library (no function)? */

+    lua_pushboolean(L, 1);  /* return 'true' */

+    return 0;  /* no errors */

+  }

+  else {

+    lua_CFunction f = lsys_sym(L, reg, sym);

+    if (f == NULL)

+      return ERRFUNC;  /* unable to find function */

+    lua_pushcfunction(L, f);  /* else create new function */

+    return 0;  /* no errors */

+  }

+}

+

+

+static int ll_loadlib (lua_State *L) {

+  const char *path = luaL_checkstring(L, 1);

+  const char *init = luaL_checkstring(L, 2);

+  int stat = lookforfunc(L, path, init);

+  if (stat == 0)  /* no errors? */

+    return 1;  /* return the loaded function */

+  else {  /* error; error message is on stack top */

+    luaL_pushfail(L);

+    lua_insert(L, -2);

+    lua_pushstring(L, (stat == ERRLIB) ?  LIB_FAIL : "init");

+    return 3;  /* return fail, error message, and where */

+  }

+}

+

+

+

+/*

+** {======================================================

+** 'require' function

+** =======================================================

+*/

+

+

+static int readable (const char *filename) {

+  FILE *f = fopen(filename, "r");  /* try to open file */

+  if (f == NULL) return 0;  /* open failed */

+  fclose(f);

+  return 1;

+}

+

+

+/*

+** Get the next name in '*path' = 'name1;name2;name3;...', changing

+** the ending ';' to '\0' to create a zero-terminated string. Return

+** NULL when list ends.

+*/

+static const char *getnextfilename (char **path, char *end) {

+  char *sep;

+  char *name = *path;

+  if (name == end)

+    return NULL;  /* no more names */

+  else if (*name == '\0') {  /* from previous iteration? */

+    *name = *LUA_PATH_SEP;  /* restore separator */

+    name++;  /* skip it */

+  }

+  sep = strchr(name, *LUA_PATH_SEP);  /* find next separator */

+  if (sep == NULL)  /* separator not found? */

+    sep = end;  /* name goes until the end */

+  *sep = '\0';  /* finish file name */

+  *path = sep;  /* will start next search from here */

+  return name;

+}

+

+

+/*

+** Given a path such as ";blabla.so;blublu.so", pushes the string

+**

+** no file 'blabla.so'

+**	no file 'blublu.so'

+*/

+static void pusherrornotfound (lua_State *L, const char *path) {

+  luaL_Buffer b;

+  luaL_buffinit(L, &b);

+  luaL_addstring(&b, "no file '");

+  luaL_addgsub(&b, path, LUA_PATH_SEP, "'\n\tno file '");

+  luaL_addstring(&b, "'");

+  luaL_pushresult(&b);

+}

+

+

+static const char *searchpath (lua_State *L, const char *name,

+                                             const char *path,

+                                             const char *sep,

+                                             const char *dirsep) {

+  luaL_Buffer buff;

+  char *pathname;  /* path with name inserted */

+  char *endpathname;  /* its end */

+  const char *filename;

+  /* separator is non-empty and appears in 'name'? */

+  if (*sep != '\0' && strchr(name, *sep) != NULL)

+    name = luaL_gsub(L, name, sep, dirsep);  /* replace it by 'dirsep' */

+  luaL_buffinit(L, &buff);

+  /* add path to the buffer, replacing marks ('?') with the file name */

+  luaL_addgsub(&buff, path, LUA_PATH_MARK, name);

+  luaL_addchar(&buff, '\0');

+  pathname = luaL_buffaddr(&buff);  /* writable list of file names */

+  endpathname = pathname + luaL_bufflen(&buff) - 1;

+  while ((filename = getnextfilename(&pathname, endpathname)) != NULL) {

+    if (readable(filename))  /* does file exist and is readable? */

+      return lua_pushstring(L, filename);  /* save and return name */

+  }

+  luaL_pushresult(&buff);  /* push path to create error message */

+  pusherrornotfound(L, lua_tostring(L, -1));  /* create error message */

+  return NULL;  /* not found */

+}

+

+

+static int ll_searchpath (lua_State *L) {

+  const char *f = searchpath(L, luaL_checkstring(L, 1),

+                                luaL_checkstring(L, 2),

+                                luaL_optstring(L, 3, "."),

+                                luaL_optstring(L, 4, LUA_DIRSEP));

+  if (f != NULL) return 1;

+  else {  /* error message is on top of the stack */

+    luaL_pushfail(L);

+    lua_insert(L, -2);

+    return 2;  /* return fail + error message */

+  }

+}

+

+

+static const char *findfile (lua_State *L, const char *name,

+                                           const char *pname,

+                                           const char *dirsep) {

+  const char *path;

+  lua_getfield(L, lua_upvalueindex(1), pname);

+  path = lua_tostring(L, -1);

+  if (path == NULL)

+    luaL_error(L, "'package.%s' must be a string", pname);

+  return searchpath(L, name, path, ".", dirsep);

+}

+

+

+static int checkload (lua_State *L, int stat, const char *filename) {

+  if (stat) {  /* module loaded successfully? */

+    lua_pushstring(L, filename);  /* will be 2nd argument to module */

+    return 2;  /* return open function and file name */

+  }

+  else

+    return luaL_error(L, "error loading module '%s' from file '%s':\n\t%s",

+                          lua_tostring(L, 1), filename, lua_tostring(L, -1));

+}

+

+

+static int searcher_Lua (lua_State *L) {

+  const char *filename;

+  const char *name = luaL_checkstring(L, 1);

+  filename = findfile(L, name, "path", LUA_LSUBSEP);

+  if (filename == NULL) return 1;  /* module not found in this path */

+  return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename);

+}

+

+

+/*

+** Try to find a load function for module 'modname' at file 'filename'.

+** First, change '.' to '_' in 'modname'; then, if 'modname' has

+** the form X-Y (that is, it has an "ignore mark"), build a function

+** name "luaopen_X" and look for it. (For compatibility, if that

+** fails, it also tries "luaopen_Y".) If there is no ignore mark,

+** look for a function named "luaopen_modname".

+*/

+static int loadfunc (lua_State *L, const char *filename, const char *modname) {

+  const char *openfunc;

+  const char *mark;

+  modname = luaL_gsub(L, modname, ".", LUA_OFSEP);

+  mark = strchr(modname, *LUA_IGMARK);

+  if (mark) {

+    int stat;

+    openfunc = lua_pushlstring(L, modname, mark - modname);

+    openfunc = lua_pushfstring(L, LUA_POF"%s", openfunc);

+    stat = lookforfunc(L, filename, openfunc);

+    if (stat != ERRFUNC) return stat;

+    modname = mark + 1;  /* else go ahead and try old-style name */

+  }

+  openfunc = lua_pushfstring(L, LUA_POF"%s", modname);

+  return lookforfunc(L, filename, openfunc);

+}

+

+

+static int searcher_C (lua_State *L) {

+  const char *name = luaL_checkstring(L, 1);

+  const char *filename = findfile(L, name, "cpath", LUA_CSUBSEP);

+  if (filename == NULL) return 1;  /* module not found in this path */

+  return checkload(L, (loadfunc(L, filename, name) == 0), filename);

+}

+

+

+static int searcher_Croot (lua_State *L) {

+  const char *filename;

+  const char *name = luaL_checkstring(L, 1);

+  const char *p = strchr(name, '.');

+  int stat;

+  if (p == NULL) return 0;  /* is root */

+  lua_pushlstring(L, name, p - name);

+  filename = findfile(L, lua_tostring(L, -1), "cpath", LUA_CSUBSEP);

+  if (filename == NULL) return 1;  /* root not found */

+  if ((stat = loadfunc(L, filename, name)) != 0) {

+    if (stat != ERRFUNC)

+      return checkload(L, 0, filename);  /* real error */

+    else {  /* open function not found */

+      lua_pushfstring(L, "no module '%s' in file '%s'", name, filename);

+      return 1;

+    }

+  }

+  lua_pushstring(L, filename);  /* will be 2nd argument to module */

+  return 2;

+}

+

+

+static int searcher_preload (lua_State *L) {

+  const char *name = luaL_checkstring(L, 1);

+  lua_getfield(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE);

+  if (lua_getfield(L, -1, name) == LUA_TNIL) {  /* not found? */

+    lua_pushfstring(L, "no field package.preload['%s']", name);

+    return 1;

+  }

+  else {

+    lua_pushliteral(L, ":preload:");

+    return 2;

+  }

+}

+

+

+static void findloader (lua_State *L, const char *name) {

+  int i;

+  luaL_Buffer msg;  /* to build error message */

+  /* push 'package.searchers' to index 3 in the stack */

+  if (lua_getfield(L, lua_upvalueindex(1), "searchers") != LUA_TTABLE)

+    luaL_error(L, "'package.searchers' must be a table");

+  luaL_buffinit(L, &msg);

+  /*  iterate over available searchers to find a loader */

+  for (i = 1; ; i++) {

+    luaL_addstring(&msg, "\n\t");  /* error-message prefix */

+    if (lua_rawgeti(L, 3, i) == LUA_TNIL) {  /* no more searchers? */

+      lua_pop(L, 1);  /* remove nil */

+      luaL_buffsub(&msg, 2);  /* remove prefix */

+      luaL_pushresult(&msg);  /* create error message */

+      luaL_error(L, "module '%s' not found:%s", name, lua_tostring(L, -1));

+    }

+    lua_pushstring(L, name);

+    lua_call(L, 1, 2);  /* call it */

+    if (lua_isfunction(L, -2))  /* did it find a loader? */

+      return;  /* module loader found */

+    else if (lua_isstring(L, -2)) {  /* searcher returned error message? */

+      lua_pop(L, 1);  /* remove extra return */

+      luaL_addvalue(&msg);  /* concatenate error message */

+    }

+    else {  /* no error message */

+      lua_pop(L, 2);  /* remove both returns */

+      luaL_buffsub(&msg, 2);  /* remove prefix */

+    }

+  }

+}

+

+

+static int ll_require (lua_State *L) {

+  const char *name = luaL_checkstring(L, 1);

+  lua_settop(L, 1);  /* LOADED table will be at index 2 */

+  lua_getfield(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE);

+  lua_getfield(L, 2, name);  /* LOADED[name] */

+  if (lua_toboolean(L, -1))  /* is it there? */

+    return 1;  /* package is already loaded */

+  /* else must load package */

+  lua_pop(L, 1);  /* remove 'getfield' result */

+  findloader(L, name);

+  lua_rotate(L, -2, 1);  /* function <-> loader data */

+  lua_pushvalue(L, 1);  /* name is 1st argument to module loader */

+  lua_pushvalue(L, -3);  /* loader data is 2nd argument */

+  /* stack: ...; loader data; loader function; mod. name; loader data */

+  lua_call(L, 2, 1);  /* run loader to load module */

+  /* stack: ...; loader data; result from loader */

+  if (!lua_isnil(L, -1))  /* non-nil return? */

+    lua_setfield(L, 2, name);  /* LOADED[name] = returned value */

+  else

+    lua_pop(L, 1);  /* pop nil */

+  if (lua_getfield(L, 2, name) == LUA_TNIL) {   /* module set no value? */

+    lua_pushboolean(L, 1);  /* use true as result */

+    lua_copy(L, -1, -2);  /* replace loader result */

+    lua_setfield(L, 2, name);  /* LOADED[name] = true */

+  }

+  lua_rotate(L, -2, 1);  /* loader data <-> module result  */

+  return 2;  /* return module result and loader data */

+}

+

+/* }====================================================== */

+

+

+

+

+static const luaL_Reg pk_funcs[] = {

+  {"loadlib", ll_loadlib},

+  {"searchpath", ll_searchpath},

+  /* placeholders */

+  {"preload", NULL},

+  {"cpath", NULL},

+  {"path", NULL},

+  {"searchers", NULL},

+  {"loaded", NULL},

+  {NULL, NULL}

+};

+

+

+static const luaL_Reg ll_funcs[] = {

+  {"require", ll_require},

+  {NULL, NULL}

+};

+

+

+static void createsearcherstable (lua_State *L) {

+  static const lua_CFunction searchers[] =

+    {searcher_preload, searcher_Lua, searcher_C, searcher_Croot, NULL};

+  int i;

+  /* create 'searchers' table */

+  lua_createtable(L, sizeof(searchers)/sizeof(searchers[0]) - 1, 0);

+  /* fill it with predefined searchers */

+  for (i=0; searchers[i] != NULL; i++) {

+    lua_pushvalue(L, -2);  /* set 'package' as upvalue for all searchers */

+    lua_pushcclosure(L, searchers[i], 1);

+    lua_rawseti(L, -2, i+1);

+  }

+  lua_setfield(L, -2, "searchers");  /* put it in field 'searchers' */

+}

+

+

+/*

+** create table CLIBS to keep track of loaded C libraries,

+** setting a finalizer to close all libraries when closing state.

+*/

+static void createclibstable (lua_State *L) {

+  luaL_getsubtable(L, LUA_REGISTRYINDEX, CLIBS);  /* create CLIBS table */

+  lua_createtable(L, 0, 1);  /* create metatable for CLIBS */

+  lua_pushcfunction(L, gctm);

+  lua_setfield(L, -2, "__gc");  /* set finalizer for CLIBS table */

+  lua_setmetatable(L, -2);

+}

+

+

+LUAMOD_API int luaopen_package (lua_State *L) {

+  createclibstable(L);

+  luaL_newlib(L, pk_funcs);  /* create 'package' table */

+  createsearcherstable(L);

+  /* set paths */

+  setpath(L, "path", LUA_PATH_VAR, LUA_PATH_DEFAULT);

+  setpath(L, "cpath", LUA_CPATH_VAR, LUA_CPATH_DEFAULT);

+  /* store config information */

+  lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATH_SEP "\n" LUA_PATH_MARK "\n"

+                     LUA_EXEC_DIR "\n" LUA_IGMARK "\n");

+  lua_setfield(L, -2, "config");

+  /* set field 'loaded' */

+  luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE);

+  lua_setfield(L, -2, "loaded");

+  /* set field 'preload' */

+  luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE);

+  lua_setfield(L, -2, "preload");

+  lua_pushglobaltable(L);

+  lua_pushvalue(L, -2);  /* set 'package' as upvalue for next lib */

+  luaL_setfuncs(L, ll_funcs, 1);  /* open lib into global table */

+  lua_pop(L, 1);  /* pop global table */

+  return 1;  /* return 'package' table */

+}

+

--- /dev/null

+++ b/lobject.c

@@ -1,0 +1,592 @@

+/*

+** $Id: lobject.c $

+** Some generic functions over Lua objects

+** See Copyright Notice in lua.h

+*/

+

+#define lobject_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <locale.h>

+#include <math.h>

+#include <stdarg.h>

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "lctype.h"

+#include "ldebug.h"

+#include "ldo.h"

+#include "lmem.h"

+#include "lobject.h"

+#include "lstate.h"

+#include "lstring.h"

+#include "lvm.h"

+

+

+/*

+** Computes ceil(log2(x))

+*/

+int luaO_ceillog2 (unsigned int x) {

+  static const lu_byte log_2[256] = {  /* log_2[i] = ceil(log2(i - 1)) */

+    0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,

+    6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,

+    7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,

+    7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,

+    8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,

+    8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,

+    8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,

+    8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8

+  };

+  int l = 0;

+  x--;

+  while (x >= 256) { l += 8; x >>= 8; }

+  return l + log_2[x];

+}

+

+

+static lua_Integer intarith (lua_State *L, int op, lua_Integer v1,

+                                                   lua_Integer v2) {

+  switch (op) {

+    case LUA_OPADD: return intop(+, v1, v2);

+    case LUA_OPSUB:return intop(-, v1, v2);

+    case LUA_OPMUL:return intop(*, v1, v2);

+    case LUA_OPMOD: return luaV_mod(L, v1, v2);

+    case LUA_OPIDIV: return luaV_idiv(L, v1, v2);

+    case LUA_OPBAND: return intop(&, v1, v2);

+    case LUA_OPBOR: return intop(|, v1, v2);

+    case LUA_OPBXOR: return intop(^, v1, v2);

+    case LUA_OPSHL: return luaV_shiftl(v1, v2);

+    case LUA_OPSHR: return luaV_shiftl(v1, -v2);

+    case LUA_OPUNM: return intop(-, 0, v1);

+    case LUA_OPBNOT: return intop(^, ~l_castS2U(0), v1);

+    default: lua_assert(0); return 0;

+  }

+}

+

+

+static lua_Number numarith (lua_State *L, int op, lua_Number v1,

+                                                  lua_Number v2) {

+  switch (op) {

+    case LUA_OPADD: return luai_numadd(L, v1, v2);

+    case LUA_OPSUB: return luai_numsub(L, v1, v2);

+    case LUA_OPMUL: return luai_nummul(L, v1, v2);

+    case LUA_OPDIV: return luai_numdiv(L, v1, v2);

+    case LUA_OPPOW: return luai_numpow(L, v1, v2);

+    case LUA_OPIDIV: return luai_numidiv(L, v1, v2);

+    case LUA_OPUNM: return luai_numunm(L, v1);

+    case LUA_OPMOD: return luaV_modf(L, v1, v2);

+    default: lua_assert(0); return 0;

+  }

+}

+

+

+int luaO_rawarith (lua_State *L, int op, const TValue *p1, const TValue *p2,

+                   TValue *res) {

+  switch (op) {

+    case LUA_OPBAND: case LUA_OPBOR: case LUA_OPBXOR:

+    case LUA_OPSHL: case LUA_OPSHR:

+    case LUA_OPBNOT: {  /* operate only on integers */

+      lua_Integer i1; lua_Integer i2;

+      if (tointegerns(p1, &i1) && tointegerns(p2, &i2)) {

+        setivalue(res, intarith(L, op, i1, i2));

+        return 1;

+      }

+      else return 0;  /* fail */

+    }

+    case LUA_OPDIV: case LUA_OPPOW: {  /* operate only on floats */

+      lua_Number n1; lua_Number n2;

+      if (tonumberns(p1, n1) && tonumberns(p2, n2)) {

+        setfltvalue(res, numarith(L, op, n1, n2));

+        return 1;

+      }

+      else return 0;  /* fail */

+    }

+    default: {  /* other operations */

+      lua_Number n1; lua_Number n2;

+      if (ttisinteger(p1) && ttisinteger(p2)) {

+        setivalue(res, intarith(L, op, ivalue(p1), ivalue(p2)));

+        return 1;

+      }

+      else if (tonumberns(p1, n1) && tonumberns(p2, n2)) {

+        setfltvalue(res, numarith(L, op, n1, n2));

+        return 1;

+      }

+      else return 0;  /* fail */

+    }

+  }

+}

+

+

+void luaO_arith (lua_State *L, int op, const TValue *p1, const TValue *p2,

+                 StkId res) {

+  if (!luaO_rawarith(L, op, p1, p2, s2v(res))) {

+    /* could not perform raw operation; try metamethod */

+    luaT_trybinTM(L, p1, p2, res, cast(TMS, (op - LUA_OPADD) + TM_ADD));

+  }

+}

+

+

+int luaO_hexavalue (int c) {

+  if (lisdigit(c)) return c - '0';

+  else return (ltolower(c) - 'a') + 10;

+}

+

+

+static int isneg (const char **s) {

+  if (**s == '-') { (*s)++; return 1; }

+  else if (**s == '+') (*s)++;

+  return 0;

+}

+

+

+

+/*

+** {==================================================================

+** Lua's implementation for 'lua_strx2number'

+** ===================================================================

+*/

+

+#if !defined(lua_strx2number)

+

+/* maximum number of significant digits to read (to avoid overflows

+   even with single floats) */

+#define MAXSIGDIG	30

+

+/*

+** convert a hexadecimal numeric string to a number, following

+** C99 specification for 'strtod'

+*/

+static lua_Number lua_strx2number (const char *s, char **endptr) {

+  int dot = lua_getlocaledecpoint();

+  lua_Number r = 0.0;  /* result (accumulator) */

+  int sigdig = 0;  /* number of significant digits */

+  int nosigdig = 0;  /* number of non-significant digits */

+  int e = 0;  /* exponent correction */

+  int neg;  /* 1 if number is negative */

+  int hasdot = 0;  /* true after seen a dot */

+  *endptr = cast_charp(s);  /* nothing is valid yet */

+  while (lisspace(cast_uchar(*s))) s++;  /* skip initial spaces */

+  neg = isneg(&s);  /* check sign */

+  if (!(*s == '0' && (*(s + 1) == 'x' || *(s + 1) == 'X')))  /* check '0x' */

+    return 0.0;  /* invalid format (no '0x') */

+  for (s += 2; ; s++) {  /* skip '0x' and read numeral */

+    if (*s == dot) {

+      if (hasdot) break;  /* second dot? stop loop */

+      else hasdot = 1;

+    }

+    else if (lisxdigit(cast_uchar(*s))) {

+      if (sigdig == 0 && *s == '0')  /* non-significant digit (zero)? */

+        nosigdig++;

+      else if (++sigdig <= MAXSIGDIG)  /* can read it without overflow? */

+          r = (r * cast_num(16.0)) + luaO_hexavalue(*s);

+      else e++; /* too many digits; ignore, but still count for exponent */

+      if (hasdot) e--;  /* decimal digit? correct exponent */

+    }

+    else break;  /* neither a dot nor a digit */

+  }

+  if (nosigdig + sigdig == 0)  /* no digits? */

+    return 0.0;  /* invalid format */

+  *endptr = cast_charp(s);  /* valid up to here */

+  e *= 4;  /* each digit multiplies/divides value by 2^4 */

+  if (*s == 'p' || *s == 'P') {  /* exponent part? */

+    int exp1 = 0;  /* exponent value */

+    int neg1;  /* exponent sign */

+    s++;  /* skip 'p' */

+    neg1 = isneg(&s);  /* sign */

+    if (!lisdigit(cast_uchar(*s)))

+      return 0.0;  /* invalid; must have at least one digit */

+    while (lisdigit(cast_uchar(*s)))  /* read exponent */

+      exp1 = exp1 * 10 + *(s++) - '0';

+    if (neg1) exp1 = -exp1;

+    e += exp1;

+    *endptr = cast_charp(s);  /* valid up to here */

+  }

+  if (neg) r = -r;

+  return l_mathop(ldexp)(r, e);

+}

+

+#endif

+/* }====================================================== */

+

+

+/* maximum length of a numeral to be converted to a number */

+#if !defined (L_MAXLENNUM)

+#define L_MAXLENNUM	200

+#endif

+

+/*

+** Convert string 's' to a Lua number (put in 'result'). Return NULL on

+** fail or the address of the ending '\0' on success. ('mode' == 'x')

+** means a hexadecimal numeral.

+*/

+static const char *l_str2dloc (const char *s, lua_Number *result, int mode) {

+  char *endptr;

+  *result = (mode == 'x') ? lua_strx2number(s, &endptr)  /* try to convert */

+                          : lua_str2number(s, &endptr);

+  if (endptr == s) return NULL;  /* nothing recognized? */

+  while (lisspace(cast_uchar(*endptr))) endptr++;  /* skip trailing spaces */

+  return (*endptr == '\0') ? endptr : NULL;  /* OK iff no trailing chars */

+}

+

+

+/*

+** Convert string 's' to a Lua number (put in 'result') handling the

+** current locale.

+** This function accepts both the current locale or a dot as the radix

+** mark. If the conversion fails, it may mean number has a dot but

+** locale accepts something else. In that case, the code copies 's'

+** to a buffer (because 's' is read-only), changes the dot to the

+** current locale radix mark, and tries to convert again.

+** The variable 'mode' checks for special characters in the string:

+** - 'n' means 'inf' or 'nan' (which should be rejected)

+** - 'x' means a hexadecimal numeral

+** - '.' just optimizes the search for the common case (no special chars)

+*/

+static const char *l_str2d (const char *s, lua_Number *result) {

+  const char *endptr;

+  const char *pmode = strpbrk(s, ".xXnN");  /* look for special chars */

+  int mode = pmode ? ltolower(cast_uchar(*pmode)) : 0;

+  if (mode == 'n')  /* reject 'inf' and 'nan' */

+    return NULL;

+  endptr = l_str2dloc(s, result, mode);  /* try to convert */

+  if (endptr == NULL) {  /* failed? may be a different locale */

+    char buff[L_MAXLENNUM + 1];

+    const char *pdot = strchr(s, '.');

+    if (pdot == NULL || strlen(s) > L_MAXLENNUM)

+      return NULL;  /* string too long or no dot; fail */

+    strcpy(buff, s);  /* copy string to buffer */

+    buff[pdot - s] = lua_getlocaledecpoint();  /* correct decimal point */

+    endptr = l_str2dloc(buff, result, mode);  /* try again */

+    if (endptr != NULL)

+      endptr = s + (endptr - buff);  /* make relative to 's' */

+  }

+  return endptr;

+}

+

+

+#define MAXBY10		cast(lua_Unsigned, LUA_MAXINTEGER / 10)

+#define MAXLASTD	cast_int(LUA_MAXINTEGER % 10)

+

+static const char *l_str2int (const char *s, lua_Integer *result) {

+  lua_Unsigned a = 0;

+  int empty = 1;

+  int neg;

+  while (lisspace(cast_uchar(*s))) s++;  /* skip initial spaces */

+  neg = isneg(&s);

+  if (s[0] == '0' &&

+      (s[1] == 'x' || s[1] == 'X')) {  /* hex? */

+    s += 2;  /* skip '0x' */

+    for (; lisxdigit(cast_uchar(*s)); s++) {

+      a = a * 16 + luaO_hexavalue(*s);

+      empty = 0;

+    }

+  }

+  else {  /* decimal */

+    for (; lisdigit(cast_uchar(*s)); s++) {

+      int d = *s - '0';

+      if (a >= MAXBY10 && (a > MAXBY10 || d > MAXLASTD + neg))  /* overflow? */

+        return NULL;  /* do not accept it (as integer) */

+      a = a * 10 + d;

+      empty = 0;

+    }

+  }

+  while (lisspace(cast_uchar(*s))) s++;  /* skip trailing spaces */

+  if (empty || *s != '\0') return NULL;  /* something wrong in the numeral */

+  else {

+    *result = l_castU2S((neg) ? 0u - a : a);

+    return s;

+  }

+}

+

+

+size_t luaO_str2num (const char *s, TValue *o) {

+  lua_Integer i; lua_Number n;

+  const char *e;

+  if ((e = l_str2int(s, &i)) != NULL) {  /* try as an integer */

+    setivalue(o, i);

+  }

+  else if ((e = l_str2d(s, &n)) != NULL) {  /* else try as a float */

+    setfltvalue(o, n);

+  }

+  else

+    return 0;  /* conversion failed */

+  return (e - s) + 1;  /* success; return string size */

+}

+

+

+int luaO_utf8esc (char *buff, unsigned long x) {

+  int n = 1;  /* number of bytes put in buffer (backwards) */

+  lua_assert(x <= 0x7FFFFFFFu);

+  if (x < 0x80)  /* ascii? */

+    buff[UTF8BUFFSZ - 1] = cast_char(x);

+  else {  /* need continuation bytes */

+    unsigned int mfb = 0x3f;  /* maximum that fits in first byte */

+    do {  /* add continuation bytes */

+      buff[UTF8BUFFSZ - (n++)] = cast_char(0x80 | (x & 0x3f));

+      x >>= 6;  /* remove added bits */

+      mfb >>= 1;  /* now there is one less bit available in first byte */

+    } while (x > mfb);  /* still needs continuation byte? */

+    buff[UTF8BUFFSZ - n] = cast_char((~mfb << 1) | x);  /* add first byte */

+  }

+  return n;

+}

+

+

+/*

+** Maximum length of the conversion of a number to a string. Must be

+** enough to accommodate both LUA_INTEGER_FMT and LUA_NUMBER_FMT.

+** (For a long long int, this is 19 digits plus a sign and a final '\0',

+** adding to 21. For a long double, it can go to a sign, 33 digits,

+** the dot, an exponent letter, an exponent sign, 5 exponent digits,

+** and a final '\0', adding to 43.)

+*/

+#define MAXNUMBER2STR	44

+

+

+/*

+** Convert a number object to a string, adding it to a buffer

+*/

+static int tostringbuff (TValue *obj, char *buff) {

+  int len;

+  lua_assert(ttisnumber(obj));

+  if (ttisinteger(obj))

+    len = lua_integer2str(buff, MAXNUMBER2STR, ivalue(obj));

+  else {

+    len = lua_number2str(buff, MAXNUMBER2STR, fltvalue(obj));

+    if (buff[strspn(buff, "-0123456789")] == '\0') {  /* looks like an int? */

+      buff[len++] = lua_getlocaledecpoint();

+      buff[len++] = '0';  /* adds '.0' to result */

+    }

+  }

+  return len;

+}

+

+

+/*

+** Convert a number object to a Lua string, replacing the value at 'obj'

+*/

+void luaO_tostring (lua_State *L, TValue *obj) {

+  char buff[MAXNUMBER2STR];

+  int len = tostringbuff(obj, buff);

+  setsvalue(L, obj, luaS_newlstr(L, buff, len));

+}

+

+

+

+

+/*

+** {==================================================================

+** 'luaO_pushvfstring'

+** ===================================================================

+*/

+

+/* size for buffer space used by 'luaO_pushvfstring' */

+#define BUFVFS		200

+

+/* buffer used by 'luaO_pushvfstring' */

+typedef struct BuffFS {

+  lua_State *L;

+  int pushed;  /* number of string pieces already on the stack */

+  int blen;  /* length of partial string in 'space' */

+  char space[BUFVFS];  /* holds last part of the result */

+} BuffFS;

+

+

+/*

+** Push given string to the stack, as part of the buffer, and

+** join the partial strings in the stack into one.

+*/

+static void pushstr (BuffFS *buff, const char *str, size_t l) {

+  lua_State *L = buff->L;

+  setsvalue2s(L, L->top, luaS_newlstr(L, str, l));

+  L->top++;  /* may use one extra slot */

+  buff->pushed++;

+  luaV_concat(L, buff->pushed);  /* join partial results into one */

+  buff->pushed = 1;

+}

+

+

+/*

+** empty the buffer space into the stack

+*/

+static void clearbuff (BuffFS *buff) {

+  pushstr(buff, buff->space, buff->blen);  /* push buffer contents */

+  buff->blen = 0;  /* space now is empty */

+}

+

+

+/*

+** Get a space of size 'sz' in the buffer. If buffer has not enough

+** space, empty it. 'sz' must fit in an empty buffer.

+*/

+static char *getbuff (BuffFS *buff, int sz) {

+  lua_assert(buff->blen <= BUFVFS); lua_assert(sz <= BUFVFS);

+  if (sz > BUFVFS - buff->blen)  /* not enough space? */

+    clearbuff(buff);

+  return buff->space + buff->blen;

+}

+

+

+#define addsize(b,sz)	((b)->blen += (sz))

+

+

+/*

+** Add 'str' to the buffer. If string is larger than the buffer space,

+** push the string directly to the stack.

+*/

+static void addstr2buff (BuffFS *buff, const char *str, size_t slen) {

+  if (slen <= BUFVFS) {  /* does string fit into buffer? */

+    char *bf = getbuff(buff, cast_int(slen));

+    memcpy(bf, str, slen);  /* add string to buffer */

+    addsize(buff, cast_int(slen));

+  }

+  else {  /* string larger than buffer */

+    clearbuff(buff);  /* string comes after buffer's content */

+    pushstr(buff, str, slen);  /* push string */

+  }

+}

+

+

+/*

+** Add a number to the buffer.

+*/

+static void addnum2buff (BuffFS *buff, TValue *num) {

+  char *numbuff = getbuff(buff, MAXNUMBER2STR);

+  int len = tostringbuff(num, numbuff);  /* format number into 'numbuff' */

+  addsize(buff, len);

+}

+

+

+/*

+** this function handles only '%d', '%c', '%f', '%p', '%s', and '%%'

+   conventional formats, plus Lua-specific '%I' and '%U'

+*/

+const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {

+  BuffFS buff;  /* holds last part of the result */

+  const char *e;  /* points to next '%' */

+  buff.pushed = buff.blen = 0;

+  buff.L = L;

+  while ((e = strchr(fmt, '%')) != NULL) {

+    addstr2buff(&buff, fmt, e - fmt);  /* add 'fmt' up to '%' */

+    switch (*(e + 1)) {  /* conversion specifier */

+      case 's': {  /* zero-terminated string */

+        const char *s = va_arg(argp, char *);

+        if (s == NULL) s = "(null)";

+        addstr2buff(&buff, s, strlen(s));

+        break;

+      }

+      case 'c': {  /* an 'int' as a character */

+        char c = cast_uchar(va_arg(argp, int));

+        addstr2buff(&buff, &c, sizeof(char));

+        break;

+      }

+      case 'd': {  /* an 'int' */

+        TValue num;

+        setivalue(&num, va_arg(argp, int));

+        addnum2buff(&buff, &num);

+        break;

+      }

+      case 'I': {  /* a 'lua_Integer' */

+        TValue num;

+        setivalue(&num, cast(lua_Integer, va_arg(argp, l_uacInt)));

+        addnum2buff(&buff, &num);

+        break;

+      }

+      case 'f': {  /* a 'lua_Number' */

+        TValue num;

+        setfltvalue(&num, cast_num(va_arg(argp, l_uacNumber)));

+        addnum2buff(&buff, &num);

+        break;

+      }

+      case 'p': {  /* a pointer */

+        const int sz = 3 * sizeof(void*) + 8; /* enough space for '%p' */

+        char *bf = getbuff(&buff, sz);

+        void *p = va_arg(argp, void *);

+        int len = lua_pointer2str(bf, sz, p);

+        addsize(&buff, len);

+        break;

+      }

+      case 'U': {  /* a 'long' as a UTF-8 sequence */

+        char bf[UTF8BUFFSZ];

+        int len = luaO_utf8esc(bf, va_arg(argp, long));

+        addstr2buff(&buff, bf + UTF8BUFFSZ - len, len);

+        break;

+      }

+      case '%': {

+        addstr2buff(&buff, "%", 1);

+        break;

+      }

+      default: {

+        luaG_runerror(L, "invalid option '%%%c' to 'lua_pushfstring'",

+                         *(e + 1));

+      }

+    }

+    fmt = e + 2;  /* skip '%' and the specifier */

+  }

+  addstr2buff(&buff, fmt, strlen(fmt));  /* rest of 'fmt' */

+  clearbuff(&buff);  /* empty buffer into the stack */

+  lua_assert(buff.pushed == 1);

+  return svalue(s2v(L->top - 1));

+}

+

+

+const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {

+  const char *msg;

+  va_list argp;

+  va_start(argp, fmt);

+  msg = luaO_pushvfstring(L, fmt, argp);

+  va_end(argp);

+  return msg;

+}

+

+/* }================================================================== */

+

+

+#define RETS	"..."

+#define PRE	"[string \""

+#define POS	"\"]"

+

+#define addstr(a,b,l)	( memcpy(a,b,(l) * sizeof(char)), a += (l) )

+

+void luaO_chunkid (char *out, const char *source, size_t srclen) {

+  size_t bufflen = LUA_IDSIZE;  /* free space in buffer */

+  if (*source == '=') {  /* 'literal' source */

+    if (srclen <= bufflen)  /* small enough? */

+      memcpy(out, source + 1, srclen * sizeof(char));

+    else {  /* truncate it */

+      addstr(out, source + 1, bufflen - 1);

+      *out = '\0';

+    }

+  }

+  else if (*source == '@') {  /* file name */

+    if (srclen <= bufflen)  /* small enough? */

+      memcpy(out, source + 1, srclen * sizeof(char));

+    else {  /* add '...' before rest of name */

+      addstr(out, RETS, LL(RETS));

+      bufflen -= LL(RETS);

+      memcpy(out, source + 1 + srclen - bufflen, bufflen * sizeof(char));

+    }

+  }

+  else {  /* string; format as [string "source"] */

+    const char *nl = strchr(source, '\n');  /* find first new line (if any) */

+    addstr(out, PRE, LL(PRE));  /* add prefix */

+    bufflen -= LL(PRE RETS POS) + 1;  /* save space for prefix+suffix+'\0' */

+    if (srclen < bufflen && nl == NULL) {  /* small one-line source? */

+      addstr(out, source, srclen);  /* keep it */

+    }

+    else {

+      if (nl != NULL) srclen = nl - source;  /* stop at first newline */

+      if (srclen > bufflen) srclen = bufflen;

+      addstr(out, source, srclen);

+      addstr(out, RETS, LL(RETS));

+    }

+    memcpy(out, POS, (LL(POS) + 1) * sizeof(char));

+  }

+}

+

--- /dev/null

+++ b/lobject.h

@@ -1,0 +1,790 @@

+/*

+** $Id: lobject.h $

+** Type definitions for Lua objects

+** See Copyright Notice in lua.h

+*/

+

+

+#ifndef lobject_h

+#define lobject_h

+

+

+#include <stdarg.h>

+

+

+#include "llimits.h"

+#include "lua.h"

+

+

+/*

+** Extra types for collectable non-values

+*/

+#define LUA_TUPVAL	LUA_NUMTYPES  /* upvalues */

+#define LUA_TPROTO	(LUA_NUMTYPES+1)  /* function prototypes */

+#define LUA_TDEADKEY	(LUA_NUMTYPES+2)  /* removed keys in tables */

+

+

+

+/*

+** number of all possible types (including LUA_TNONE but excluding DEADKEY)

+*/

+#define LUA_TOTALTYPES		(LUA_TPROTO + 2)

+

+

+/*

+** tags for Tagged Values have the following use of bits:

+** bits 0-3: actual tag (a LUA_T* constant)

+** bits 4-5: variant bits

+** bit 6: whether value is collectable

+*/

+

+/* add variant bits to a type */

+#define makevariant(t,v)	((t) | ((v) << 4))

+

+

+

+/*

+** Union of all Lua values

+*/

+typedef union Value {

+  struct GCObject *gc;    /* collectable objects */

+  void *p;         /* light userdata */

+  lua_CFunction f; /* light C functions */

+  lua_Integer i;   /* integer numbers */

+  lua_Number n;    /* float numbers */

+} Value;

+

+

+/*

+** Tagged Values. This is the basic representation of values in Lua:

+** an actual value plus a tag with its type.

+*/

+

+#define TValuefields	Value value_; lu_byte tt_

+

+typedef struct TValue {

+  TValuefields;

+} TValue;

+

+

+#define val_(o)		((o)->value_)

+#define valraw(o)	(&val_(o))

+

+

+/* raw type tag of a TValue */

+#define rawtt(o)	((o)->tt_)

+

+/* tag with no variants (bits 0-3) */

+#define novariant(t)	((t) & 0x0F)

+

+/* type tag of a TValue (bits 0-3 for tags + variant bits 4-5) */

+#define withvariant(t)	((t) & 0x3F)

+#define ttypetag(o)	withvariant(rawtt(o))

+

+/* type of a TValue */

+#define ttype(o)	(novariant(rawtt(o)))

+

+

+/* Macros to test type */

+#define checktag(o,t)		(rawtt(o) == (t))

+#define checktype(o,t)		(ttype(o) == (t))

+

+

+/* Macros for internal tests */

+

+/* collectable object has the same tag as the original value */

+#define righttt(obj)		(ttypetag(obj) == gcvalue(obj)->tt)

+

+/*

+** Any value being manipulated by the program either is non

+** collectable, or the collectable object has the right tag

+** and it is not dead. The option 'L == NULL' allows other

+** macros using this one to be used where L is not available.

+*/

+#define checkliveness(L,obj) \

+	((void)L, lua_longassert(!iscollectable(obj) || \

+		(righttt(obj) && (L == NULL || !isdead(G(L),gcvalue(obj))))))

+

+

+/* Macros to set values */

+

+/* set a value's tag */

+#define settt_(o,t)	((o)->tt_=(t))

+

+

+/* main macro to copy values (from 'obj1' to 'obj2') */

+#define setobj(L,obj1,obj2) \

+	{ TValue *io1=(obj1); const TValue *io2=(obj2); \

+          io1->value_ = io2->value_; settt_(io1, io2->tt_); \

+	  checkliveness(L,io1); lua_assert(!isnonstrictnil(io1)); }

+

+/*

+** Different types of assignments, according to source and destination.

+** (They are mostly equal now, but may be different in the future.)

+*/

+

+/* from stack to stack */

+#define setobjs2s(L,o1,o2)	setobj(L,s2v(o1),s2v(o2))

+/* to stack (not from same stack) */

+#define setobj2s(L,o1,o2)	setobj(L,s2v(o1),o2)

+/* from table to same table */

+#define setobjt2t	setobj

+/* to new object */

+#define setobj2n	setobj

+/* to table */

+#define setobj2t	setobj

+

+

+/*

+** Entries in the Lua stack

+*/

+typedef union StackValue {

+  TValue val;

+} StackValue;

+

+

+/* index to stack elements */

+typedef StackValue *StkId;

+

+/* convert a 'StackValue' to a 'TValue' */

+#define s2v(o)	(&(o)->val)

+

+

+

+/*

+** {==================================================================

+** Nil

+** ===================================================================

+*/

+

+/* Standard nil */

+#define LUA_VNIL	makevariant(LUA_TNIL, 0)

+

+/* Empty slot (which might be different from a slot containing nil) */

+#define LUA_VEMPTY	makevariant(LUA_TNIL, 1)

+

+/* Value returned for a key not found in a table (absent key) */

+#define LUA_VABSTKEY	makevariant(LUA_TNIL, 2)

+

+

+/* macro to test for (any kind of) nil */

+#define ttisnil(v)		checktype((v), LUA_TNIL)

+

+

+/* macro to test for a standard nil */

+#define ttisstrictnil(o)	checktag((o), LUA_VNIL)

+

+

+#define setnilvalue(obj) settt_(obj, LUA_VNIL)

+

+

+#define isabstkey(v)		checktag((v), LUA_VABSTKEY)

+

+

+/*

+** macro to detect non-standard nils (used only in assertions)

+*/

+#define isnonstrictnil(v)	(ttisnil(v) && !ttisstrictnil(v))

+

+

+/*

+** By default, entries with any kind of nil are considered empty.

+** (In any definition, values associated with absent keys must also

+** be accepted as empty.)

+*/

+#define isempty(v)		ttisnil(v)

+

+

+/* macro defining a value corresponding to an absent key */

+#define ABSTKEYCONSTANT		{NULL}, LUA_VABSTKEY

+

+

+/* mark an entry as empty */

+#define setempty(v)		settt_(v, LUA_VEMPTY)

+

+

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Booleans

+** ===================================================================

+*/

+

+

+#define LUA_VFALSE	makevariant(LUA_TBOOLEAN, 0)

+#define LUA_VTRUE	makevariant(LUA_TBOOLEAN, 1)

+

+#define ttisboolean(o)		checktype((o), LUA_TBOOLEAN)

+#define ttisfalse(o)		checktag((o), LUA_VFALSE)

+#define ttistrue(o)		checktag((o), LUA_VTRUE)

+

+

+#define l_isfalse(o)	(ttisfalse(o) || ttisnil(o))

+

+

+#define setbfvalue(obj)		settt_(obj, LUA_VFALSE)

+#define setbtvalue(obj)		settt_(obj, LUA_VTRUE)

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Threads

+** ===================================================================

+*/

+

+#define LUA_VTHREAD		makevariant(LUA_TTHREAD, 0)

+

+#define ttisthread(o)		checktag((o), ctb(LUA_VTHREAD))

+

+#define thvalue(o)	check_exp(ttisthread(o), gco2th(val_(o).gc))

+

+#define setthvalue(L,obj,x) \

+  { TValue *io = (obj); lua_State *x_ = (x); \

+    val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VTHREAD)); \

+    checkliveness(L,io); }

+

+#define setthvalue2s(L,o,t)	setthvalue(L,s2v(o),t)

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Collectable Objects

+** ===================================================================

+*/

+

+/*

+** Common Header for all collectable objects (in macro form, to be

+** included in other objects)

+*/

+#define CommonHeader	struct GCObject *next; lu_byte tt; lu_byte marked

+

+

+/* Common type for all collectable objects */

+typedef struct GCObject {

+  CommonHeader;

+} GCObject;

+

+

+/* Bit mark for collectable types */

+#define BIT_ISCOLLECTABLE	(1 << 6)

+

+#define iscollectable(o)	(rawtt(o) & BIT_ISCOLLECTABLE)

+

+/* mark a tag as collectable */

+#define ctb(t)			((t) | BIT_ISCOLLECTABLE)

+

+#define gcvalue(o)	check_exp(iscollectable(o), val_(o).gc)

+

+#define gcvalueraw(v)	((v).gc)

+

+#define setgcovalue(L,obj,x) \

+  { TValue *io = (obj); GCObject *i_g=(x); \

+    val_(io).gc = i_g; settt_(io, ctb(i_g->tt)); }

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Numbers

+** ===================================================================

+*/

+

+/* Variant tags for numbers */

+#define LUA_VNUMINT	makevariant(LUA_TNUMBER, 0)  /* integer numbers */

+#define LUA_VNUMFLT	makevariant(LUA_TNUMBER, 1)  /* float numbers */

+

+#define ttisnumber(o)		checktype((o), LUA_TNUMBER)

+#define ttisfloat(o)		checktag((o), LUA_VNUMFLT)

+#define ttisinteger(o)		checktag((o), LUA_VNUMINT)

+

+#define nvalue(o)	check_exp(ttisnumber(o), \

+	(ttisinteger(o) ? cast_num(ivalue(o)) : fltvalue(o)))

+#define fltvalue(o)	check_exp(ttisfloat(o), val_(o).n)

+#define ivalue(o)	check_exp(ttisinteger(o), val_(o).i)

+

+#define fltvalueraw(v)	((v).n)

+#define ivalueraw(v)	((v).i)

+

+#define setfltvalue(obj,x) \

+  { TValue *io=(obj); val_(io).n=(x); settt_(io, LUA_VNUMFLT); }

+

+#define chgfltvalue(obj,x) \

+  { TValue *io=(obj); lua_assert(ttisfloat(io)); val_(io).n=(x); }

+

+#define setivalue(obj,x) \

+  { TValue *io=(obj); val_(io).i=(x); settt_(io, LUA_VNUMINT); }

+

+#define chgivalue(obj,x) \

+  { TValue *io=(obj); lua_assert(ttisinteger(io)); val_(io).i=(x); }

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Strings

+** ===================================================================

+*/

+

+/* Variant tags for strings */

+#define LUA_VSHRSTR	makevariant(LUA_TSTRING, 0)  /* short strings */

+#define LUA_VLNGSTR	makevariant(LUA_TSTRING, 1)  /* long strings */

+

+#define ttisstring(o)		checktype((o), LUA_TSTRING)

+#define ttisshrstring(o)	checktag((o), ctb(LUA_VSHRSTR))

+#define ttislngstring(o)	checktag((o), ctb(LUA_VLNGSTR))

+

+#define tsvalueraw(v)	(gco2ts((v).gc))

+

+#define tsvalue(o)	check_exp(ttisstring(o), gco2ts(val_(o).gc))

+

+#define setsvalue(L,obj,x) \

+  { TValue *io = (obj); TString *x_ = (x); \

+    val_(io).gc = obj2gco(x_); settt_(io, ctb(x_->tt)); \

+    checkliveness(L,io); }

+

+/* set a string to the stack */

+#define setsvalue2s(L,o,s)	setsvalue(L,s2v(o),s)

+

+/* set a string to a new object */

+#define setsvalue2n	setsvalue

+

+

+/*

+** Header for a string value.

+*/

+typedef struct TString {

+  CommonHeader;

+  lu_byte extra;  /* reserved words for short strings; "has hash" for longs */

+  lu_byte shrlen;  /* length for short strings */

+  unsigned int hash;

+  union {

+    size_t lnglen;  /* length for long strings */

+    struct TString *hnext;  /* linked list for hash table */

+  } u;

+  char contents[1];

+} TString;

+

+

+

+/*

+** Get the actual string (array of bytes) from a 'TString'.

+*/

+#define getstr(ts)  ((ts)->contents)

+

+

+/* get the actual string (array of bytes) from a Lua value */

+#define svalue(o)       getstr(tsvalue(o))

+

+/* get string length from 'TString *s' */

+#define tsslen(s)	((s)->tt == LUA_VSHRSTR ? (s)->shrlen : (s)->u.lnglen)

+

+/* get string length from 'TValue *o' */

+#define vslen(o)	tsslen(tsvalue(o))

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Userdata

+** ===================================================================

+*/

+

+

+/*

+** Light userdata should be a variant of userdata, but for compatibility

+** reasons they are also different types.

+*/

+#define LUA_VLIGHTUSERDATA	makevariant(LUA_TLIGHTUSERDATA, 0)

+

+#define LUA_VUSERDATA		makevariant(LUA_TUSERDATA, 0)

+

+#define ttislightuserdata(o)	checktag((o), LUA_VLIGHTUSERDATA)

+#define ttisfulluserdata(o)	checktag((o), ctb(LUA_VUSERDATA))

+

+#define pvalue(o)	check_exp(ttislightuserdata(o), val_(o).p)

+#define uvalue(o)	check_exp(ttisfulluserdata(o), gco2u(val_(o).gc))

+

+#define pvalueraw(v)	((v).p)

+

+#define setpvalue(obj,x) \

+  { TValue *io=(obj); val_(io).p=(x); settt_(io, LUA_VLIGHTUSERDATA); }

+

+#define setuvalue(L,obj,x) \

+  { TValue *io = (obj); Udata *x_ = (x); \

+    val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VUSERDATA)); \

+    checkliveness(L,io); }

+

+

+/* Ensures that addresses after this type are always fully aligned. */

+typedef union UValue {

+  TValue uv;

+  LUAI_MAXALIGN;  /* ensures maximum alignment for udata bytes */

+} UValue;

+

+

+/*

+** Header for userdata with user values;

+** memory area follows the end of this structure.

+*/

+typedef struct Udata {

+  CommonHeader;

+  unsigned short nuvalue;  /* number of user values */

+  size_t len;  /* number of bytes */

+  struct Table *metatable;

+  GCObject *gclist;

+  UValue uv[1];  /* user values */

+} Udata;

+

+

+/*

+** Header for userdata with no user values. These userdata do not need

+** to be gray during GC, and therefore do not need a 'gclist' field.

+** To simplify, the code always use 'Udata' for both kinds of userdata,

+** making sure it never accesses 'gclist' on userdata with no user values.

+** This structure here is used only to compute the correct size for

+** this representation. (The 'bindata' field in its end ensures correct

+** alignment for binary data following this header.)

+*/

+typedef struct Udata0 {

+  CommonHeader;

+  unsigned short nuvalue;  /* number of user values */

+  size_t len;  /* number of bytes */

+  struct Table *metatable;

+  union {LUAI_MAXALIGN;} bindata;

+} Udata0;

+

+

+/* compute the offset of the memory area of a userdata */

+#define udatamemoffset(nuv) \

+	((nuv) == 0 ? offsetof(Udata0, bindata)  \

+                    : offsetof(Udata, uv) + (sizeof(UValue) * (nuv)))

+

+/* get the address of the memory block inside 'Udata' */

+#define getudatamem(u)	(cast_charp(u) + udatamemoffset((u)->nuvalue))

+

+/* compute the size of a userdata */

+#define sizeudata(nuv,nb)	(udatamemoffset(nuv) + (nb))

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Prototypes

+** ===================================================================

+*/

+

+#define LUA_VPROTO	makevariant(LUA_TPROTO, 0)

+

+

+/*

+** Description of an upvalue for function prototypes

+*/

+typedef struct Upvaldesc {

+  TString *name;  /* upvalue name (for debug information) */

+  lu_byte instack;  /* whether it is in stack (register) */

+  lu_byte idx;  /* index of upvalue (in stack or in outer function's list) */

+  lu_byte kind;  /* kind of corresponding variable */

+} Upvaldesc;

+

+

+/*

+** Description of a local variable for function prototypes

+** (used for debug information)

+*/

+typedef struct LocVar {

+  TString *varname;

+  int startpc;  /* first point where variable is active */

+  int endpc;    /* first point where variable is dead */

+} LocVar;

+

+

+/*

+** Associates the absolute line source for a given instruction ('pc').

+** The array 'lineinfo' gives, for each instruction, the difference in

+** lines from the previous instruction. When that difference does not

+** fit into a byte, Lua saves the absolute line for that instruction.

+** (Lua also saves the absolute line periodically, to speed up the

+** computation of a line number: we can use binary search in the

+** absolute-line array, but we must traverse the 'lineinfo' array

+** linearly to compute a line.)

+*/

+typedef struct AbsLineInfo {

+  int pc;

+  int line;

+} AbsLineInfo;

+

+/*

+** Function Prototypes

+*/

+typedef struct Proto {

+  CommonHeader;

+  lu_byte numparams;  /* number of fixed (named) parameters */

+  lu_byte is_vararg;

+  lu_byte maxstacksize;  /* number of registers needed by this function */

+  int sizeupvalues;  /* size of 'upvalues' */

+  int sizek;  /* size of 'k' */

+  int sizecode;

+  int sizelineinfo;

+  int sizep;  /* size of 'p' */

+  int sizelocvars;

+  int sizeabslineinfo;  /* size of 'abslineinfo' */

+  int linedefined;  /* debug information  */

+  int lastlinedefined;  /* debug information  */

+  TValue *k;  /* constants used by the function */

+  Instruction *code;  /* opcodes */

+  struct Proto **p;  /* functions defined inside the function */

+  Upvaldesc *upvalues;  /* upvalue information */

+  ls_byte *lineinfo;  /* information about source lines (debug information) */

+  AbsLineInfo *abslineinfo;  /* idem */

+  LocVar *locvars;  /* information about local variables (debug information) */

+  TString  *source;  /* used for debug information */

+  GCObject *gclist;

+} Proto;

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Functions

+** ===================================================================

+*/

+

+#define LUA_VUPVAL	makevariant(LUA_TUPVAL, 0)

+

+

+/* Variant tags for functions */

+#define LUA_VLCL	makevariant(LUA_TFUNCTION, 0)  /* Lua closure */

+#define LUA_VLCF	makevariant(LUA_TFUNCTION, 1)  /* light C function */

+#define LUA_VCCL	makevariant(LUA_TFUNCTION, 2)  /* C closure */

+

+#define ttisfunction(o)		checktype(o, LUA_TFUNCTION)

+#define ttisclosure(o)		((rawtt(o) & 0x1F) == LUA_VLCL)

+#define ttisLclosure(o)		checktag((o), ctb(LUA_VLCL))

+#define ttislcf(o)		checktag((o), LUA_VLCF)

+#define ttisCclosure(o)		checktag((o), ctb(LUA_VCCL))

+

+#define isLfunction(o)	ttisLclosure(o)

+

+#define clvalue(o)	check_exp(ttisclosure(o), gco2cl(val_(o).gc))

+#define clLvalue(o)	check_exp(ttisLclosure(o), gco2lcl(val_(o).gc))

+#define fvalue(o)	check_exp(ttislcf(o), val_(o).f)

+#define clCvalue(o)	check_exp(ttisCclosure(o), gco2ccl(val_(o).gc))

+

+#define fvalueraw(v)	((v).f)

+

+#define setclLvalue(L,obj,x) \

+  { TValue *io = (obj); LClosure *x_ = (x); \

+    val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VLCL)); \

+    checkliveness(L,io); }

+

+#define setclLvalue2s(L,o,cl)	setclLvalue(L,s2v(o),cl)

+

+#define setfvalue(obj,x) \

+  { TValue *io=(obj); val_(io).f=(x); settt_(io, LUA_VLCF); }

+

+#define setclCvalue(L,obj,x) \

+  { TValue *io = (obj); CClosure *x_ = (x); \

+    val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VCCL)); \

+    checkliveness(L,io); }

+

+

+/*

+** Upvalues for Lua closures

+*/

+typedef struct UpVal {

+  CommonHeader;

+  lu_byte tbc;  /* true if it represents a to-be-closed variable */

+  TValue *v;  /* points to stack or to its own value */

+  union {

+    struct {  /* (when open) */

+      struct UpVal *next;  /* linked list */

+      struct UpVal **previous;

+    } open;

+    TValue value;  /* the value (when closed) */

+  } u;

+} UpVal;

+

+

+

+#define ClosureHeader \

+	CommonHeader; lu_byte nupvalues; GCObject *gclist

+

+typedef struct CClosure {

+  ClosureHeader;

+  lua_CFunction f;

+  TValue upvalue[1];  /* list of upvalues */

+} CClosure;

+

+

+typedef struct LClosure {

+  ClosureHeader;

+  struct Proto *p;

+  UpVal *upvals[1];  /* list of upvalues */

+} LClosure;

+

+

+typedef union Closure {

+  CClosure c;

+  LClosure l;

+} Closure;

+

+

+#define getproto(o)	(clLvalue(o)->p)

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Tables

+** ===================================================================

+*/

+

+#define LUA_VTABLE	makevariant(LUA_TTABLE, 0)

+

+#define ttistable(o)		checktag((o), ctb(LUA_VTABLE))

+

+#define hvalue(o)	check_exp(ttistable(o), gco2t(val_(o).gc))

+

+#define sethvalue(L,obj,x) \

+  { TValue *io = (obj); Table *x_ = (x); \

+    val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VTABLE)); \

+    checkliveness(L,io); }

+

+#define sethvalue2s(L,o,h)	sethvalue(L,s2v(o),h)

+

+

+/*

+** Nodes for Hash tables: A pack of two TValue's (key-value pairs)

+** plus a 'next' field to link colliding entries. The distribution

+** of the key's fields ('key_tt' and 'key_val') not forming a proper

+** 'TValue' allows for a smaller size for 'Node' both in 4-byte

+** and 8-byte alignments.

+*/

+typedef union Node {

+  struct NodeKey {

+    TValuefields;  /* fields for value */

+    lu_byte key_tt;  /* key type */

+    int next;  /* for chaining */

+    Value key_val;  /* key value */

+  } u;

+  TValue i_val;  /* direct access to node's value as a proper 'TValue' */

+} Node;

+

+

+/* copy a value into a key */

+#define setnodekey(L,node,obj) \

+	{ Node *n_=(node); const TValue *io_=(obj); \

+	  n_->u.key_val = io_->value_; n_->u.key_tt = io_->tt_; \

+	  checkliveness(L,io_); }

+

+

+/* copy a value from a key */

+#define getnodekey(L,obj,node) \

+	{ TValue *io_=(obj); const Node *n_=(node); \

+	  io_->value_ = n_->u.key_val; io_->tt_ = n_->u.key_tt; \

+	  checkliveness(L,io_); }

+

+

+/*

+** About 'alimit': if 'isrealasize(t)' is true, then 'alimit' is the

+** real size of 'array'. Otherwise, the real size of 'array' is the

+** smallest power of two not smaller than 'alimit' (or zero iff 'alimit'

+** is zero); 'alimit' is then used as a hint for #t.

+*/

+

+#define BITRAS		(1 << 7)

+#define isrealasize(t)		(!((t)->flags & BITRAS))

+#define setrealasize(t)		((t)->flags &= cast_byte(~BITRAS))

+#define setnorealasize(t)	((t)->flags |= BITRAS)

+

+

+typedef struct Table {

+  CommonHeader;

+  lu_byte flags;  /* 1<<p means tagmethod(p) is not present */

+  lu_byte lsizenode;  /* log2 of size of 'node' array */

+  unsigned int alimit;  /* "limit" of 'array' array */

+  TValue *array;  /* array part */

+  Node *node;

+  Node *lastfree;  /* any free position is before this position */

+  struct Table *metatable;

+  GCObject *gclist;

+} Table;

+

+

+/*

+** Macros to manipulate keys inserted in nodes

+*/

+#define keytt(node)		((node)->u.key_tt)

+#define keyval(node)		((node)->u.key_val)

+

+#define keyisnil(node)		(keytt(node) == LUA_TNIL)

+#define keyisinteger(node)	(keytt(node) == LUA_VNUMINT)

+#define keyival(node)		(keyval(node).i)

+#define keyisshrstr(node)	(keytt(node) == ctb(LUA_VSHRSTR))

+#define keystrval(node)		(gco2ts(keyval(node).gc))

+

+#define setnilkey(node)		(keytt(node) = LUA_TNIL)

+

+#define keyiscollectable(n)	(keytt(n) & BIT_ISCOLLECTABLE)

+

+#define gckey(n)	(keyval(n).gc)

+#define gckeyN(n)	(keyiscollectable(n) ? gckey(n) : NULL)

+

+

+/*

+** Dead keys in tables have the tag DEADKEY but keep their original

+** gcvalue. This distinguishes them from regular keys but allows them to

+** be found when searched in a special way. ('next' needs that to find

+** keys removed from a table during a traversal.)

+*/

+#define setdeadkey(node)	(keytt(node) = LUA_TDEADKEY)

+#define keyisdead(node)		(keytt(node) == LUA_TDEADKEY)

+

+/* }================================================================== */

+

+

+

+/*

+** 'module' operation for hashing (size is always a power of 2)

+*/

+#define lmod(s,size) \

+	(check_exp((size&(size-1))==0, (cast_int((s) & ((size)-1)))))

+

+

+#define twoto(x)	(1<<(x))

+#define sizenode(t)	(twoto((t)->lsizenode))

+

+

+/* size of buffer for 'luaO_utf8esc' function */

+#define UTF8BUFFSZ	8

+

+LUAI_FUNC int luaO_utf8esc (char *buff, unsigned long x);

+LUAI_FUNC int luaO_ceillog2 (unsigned int x);

+LUAI_FUNC int luaO_rawarith (lua_State *L, int op, const TValue *p1,

+                             const TValue *p2, TValue *res);

+LUAI_FUNC void luaO_arith (lua_State *L, int op, const TValue *p1,

+                           const TValue *p2, StkId res);

+LUAI_FUNC size_t luaO_str2num (const char *s, TValue *o);

+LUAI_FUNC int luaO_hexavalue (int c);

+LUAI_FUNC void luaO_tostring (lua_State *L, TValue *obj);

+LUAI_FUNC const char *luaO_pushvfstring (lua_State *L, const char *fmt,

+                                                       va_list argp);

+LUAI_FUNC const char *luaO_pushfstring (lua_State *L, const char *fmt, ...);

+LUAI_FUNC void luaO_chunkid (char *out, const char *source, size_t srclen);

+

+

+#endif

+

--- /dev/null

+++ b/lopcodes.c

@@ -1,0 +1,104 @@

+/*

+** $Id: lopcodes.c $

+** Opcodes for Lua virtual machine

+** See Copyright Notice in lua.h

+*/

+

+#define lopcodes_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include "lopcodes.h"

+

+

+/* ORDER OP */

+

+LUAI_DDEF const lu_byte luaP_opmodes[NUM_OPCODES] = {

+/*       MM OT IT T  A  mode		   opcode  */

+  opmode(0, 0, 0, 0, 1, iABC)		/* OP_MOVE */

+ ,opmode(0, 0, 0, 0, 1, iAsBx)		/* OP_LOADI */

+ ,opmode(0, 0, 0, 0, 1, iAsBx)		/* OP_LOADF */

+ ,opmode(0, 0, 0, 0, 1, iABx)		/* OP_LOADK */

+ ,opmode(0, 0, 0, 0, 1, iABx)		/* OP_LOADKX */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_LOADFALSE */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_LFALSESKIP */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_LOADTRUE */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_LOADNIL */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_GETUPVAL */

+ ,opmode(0, 0, 0, 0, 0, iABC)		/* OP_SETUPVAL */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_GETTABUP */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_GETTABLE */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_GETI */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_GETFIELD */

+ ,opmode(0, 0, 0, 0, 0, iABC)		/* OP_SETTABUP */

+ ,opmode(0, 0, 0, 0, 0, iABC)		/* OP_SETTABLE */

+ ,opmode(0, 0, 0, 0, 0, iABC)		/* OP_SETI */

+ ,opmode(0, 0, 0, 0, 0, iABC)		/* OP_SETFIELD */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_NEWTABLE */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_SELF */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_ADDI */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_ADDK */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_SUBK */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_MULK */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_MODK */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_POWK */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_DIVK */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_IDIVK */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_BANDK */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_BORK */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_BXORK */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_SHRI */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_SHLI */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_ADD */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_SUB */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_MUL */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_MOD */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_POW */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_DIV */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_IDIV */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_BAND */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_BOR */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_BXOR */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_SHL */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_SHR */

+ ,opmode(1, 0, 0, 0, 0, iABC)		/* OP_MMBIN */

+ ,opmode(1, 0, 0, 0, 0, iABC)		/* OP_MMBINI*/

+ ,opmode(1, 0, 0, 0, 0, iABC)		/* OP_MMBINK*/

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_UNM */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_BNOT */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_NOT */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_LEN */

+ ,opmode(0, 0, 0, 0, 1, iABC)		/* OP_CONCAT */

+ ,opmode(0, 0, 0, 0, 0, iABC)		/* OP_CLOSE */

+ ,opmode(0, 0, 0, 0, 0, iABC)		/* OP_TBC */

+ ,opmode(0, 0, 0, 0, 0, isJ)		/* OP_JMP */

+ ,opmode(0, 0, 0, 1, 0, iABC)		/* OP_EQ */

+ ,opmode(0, 0, 0, 1, 0, iABC)		/* OP_LT */

+ ,opmode(0, 0, 0, 1, 0, iABC)		/* OP_LE */

+ ,opmode(0, 0, 0, 1, 0, iABC)		/* OP_EQK */

+ ,opmode(0, 0, 0, 1, 0, iABC)		/* OP_EQI */

+ ,opmode(0, 0, 0, 1, 0, iABC)		/* OP_LTI */

+ ,opmode(0, 0, 0, 1, 0, iABC)		/* OP_LEI */

+ ,opmode(0, 0, 0, 1, 0, iABC)		/* OP_GTI */

+ ,opmode(0, 0, 0, 1, 0, iABC)		/* OP_GEI */

+ ,opmode(0, 0, 0, 1, 0, iABC)		/* OP_TEST */

+ ,opmode(0, 0, 0, 1, 1, iABC)		/* OP_TESTSET */

+ ,opmode(0, 1, 1, 0, 1, iABC)		/* OP_CALL */

+ ,opmode(0, 1, 1, 0, 1, iABC)		/* OP_TAILCALL */

+ ,opmode(0, 0, 1, 0, 0, iABC)		/* OP_RETURN */

+ ,opmode(0, 0, 0, 0, 0, iABC)		/* OP_RETURN0 */

+ ,opmode(0, 0, 0, 0, 0, iABC)		/* OP_RETURN1 */

+ ,opmode(0, 0, 0, 0, 1, iABx)		/* OP_FORLOOP */

+ ,opmode(0, 0, 0, 0, 1, iABx)		/* OP_FORPREP */

+ ,opmode(0, 0, 0, 0, 0, iABx)		/* OP_TFORPREP */

+ ,opmode(0, 0, 0, 0, 0, iABC)		/* OP_TFORCALL */

+ ,opmode(0, 0, 0, 0, 1, iABx)		/* OP_TFORLOOP */

+ ,opmode(0, 0, 1, 0, 0, iABC)		/* OP_SETLIST */

+ ,opmode(0, 0, 0, 0, 1, iABx)		/* OP_CLOSURE */

+ ,opmode(0, 1, 0, 0, 1, iABC)		/* OP_VARARG */

+ ,opmode(0, 0, 1, 0, 1, iABC)		/* OP_VARARGPREP */

+ ,opmode(0, 0, 0, 0, 0, iAx)		/* OP_EXTRAARG */

+};

+

--- /dev/null

+++ b/lopcodes.h

@@ -1,0 +1,392 @@

+/*

+** $Id: lopcodes.h $

+** Opcodes for Lua virtual machine

+** See Copyright Notice in lua.h

+*/

+

+#ifndef lopcodes_h

+#define lopcodes_h

+

+#include "llimits.h"

+

+

+/*===========================================================================

+  We assume that instructions are unsigned 32-bit integers.

+  All instructions have an opcode in the first 7 bits.

+  Instructions can have the following formats:

+

+        3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0

+        1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0

+iABC          C(8)     |      B(8)     |k|     A(8)      |   Op(7)     |

+iABx                Bx(17)               |     A(8)      |   Op(7)     |

+iAsBx              sBx (signed)(17)      |     A(8)      |   Op(7)     |

+iAx                           Ax(25)                     |   Op(7)     |

+isJ                           sJ(25)                     |   Op(7)     |

+

+  A signed argument is represented in excess K: the represented value is

+  the written unsigned value minus K, where K is half the maximum for the

+  corresponding unsigned argument.

+===========================================================================*/

+

+

+enum OpMode {iABC, iABx, iAsBx, iAx, isJ};  /* basic instruction formats */

+

+

+/*

+** size and position of opcode arguments.

+*/

+#define SIZE_C		8

+#define SIZE_B		8

+#define SIZE_Bx		(SIZE_C + SIZE_B + 1)

+#define SIZE_A		8

+#define SIZE_Ax		(SIZE_Bx + SIZE_A)

+#define SIZE_sJ		(SIZE_Bx + SIZE_A)

+

+#define SIZE_OP		7

+

+#define POS_OP		0

+

+#define POS_A		(POS_OP + SIZE_OP)

+#define POS_k		(POS_A + SIZE_A)

+#define POS_B		(POS_k + 1)

+#define POS_C		(POS_B + SIZE_B)

+

+#define POS_Bx		POS_k

+

+#define POS_Ax		POS_A

+

+#define POS_sJ		POS_A

+

+

+/*

+** limits for opcode arguments.

+** we use (signed) 'int' to manipulate most arguments,

+** so they must fit in ints.

+*/

+

+/* Check whether type 'int' has at least 'b' bits ('b' < 32) */

+#define L_INTHASBITS(b)		((UINT_MAX >> ((b) - 1)) >= 1)

+

+

+#if L_INTHASBITS(SIZE_Bx)

+#define MAXARG_Bx	((1<<SIZE_Bx)-1)

+#else

+#define MAXARG_Bx	MAX_INT

+#endif

+

+#define OFFSET_sBx	(MAXARG_Bx>>1)         /* 'sBx' is signed */

+

+

+#if L_INTHASBITS(SIZE_Ax)

+#define MAXARG_Ax	((1<<SIZE_Ax)-1)

+#else

+#define MAXARG_Ax	MAX_INT

+#endif

+

+#if L_INTHASBITS(SIZE_sJ)

+#define MAXARG_sJ	((1 << SIZE_sJ) - 1)

+#else

+#define MAXARG_sJ	MAX_INT

+#endif

+

+#define OFFSET_sJ	(MAXARG_sJ >> 1)

+

+

+#define MAXARG_A	((1<<SIZE_A)-1)

+#define MAXARG_B	((1<<SIZE_B)-1)

+#define MAXARG_C	((1<<SIZE_C)-1)

+#define OFFSET_sC	(MAXARG_C >> 1)

+

+#define int2sC(i)	((i) + OFFSET_sC)

+#define sC2int(i)	((i) - OFFSET_sC)

+

+

+/* creates a mask with 'n' 1 bits at position 'p' */

+#define MASK1(n,p)	((~((~(Instruction)0)<<(n)))<<(p))

+

+/* creates a mask with 'n' 0 bits at position 'p' */

+#define MASK0(n,p)	(~MASK1(n,p))

+

+/*

+** the following macros help to manipulate instructions

+*/

+

+#define GET_OPCODE(i)	(cast(OpCode, ((i)>>POS_OP) & MASK1(SIZE_OP,0)))

+#define SET_OPCODE(i,o)	((i) = (((i)&MASK0(SIZE_OP,POS_OP)) | \

+		((cast(Instruction, o)<<POS_OP)&MASK1(SIZE_OP,POS_OP))))

+

+#define checkopm(i,m)	(getOpMode(GET_OPCODE(i)) == m)

+

+

+#define getarg(i,pos,size)	(cast_int(((i)>>(pos)) & MASK1(size,0)))

+#define setarg(i,v,pos,size)	((i) = (((i)&MASK0(size,pos)) | \

+                ((cast(Instruction, v)<<pos)&MASK1(size,pos))))

+

+#define GETARG_A(i)	getarg(i, POS_A, SIZE_A)

+#define SETARG_A(i,v)	setarg(i, v, POS_A, SIZE_A)

+

+#define GETARG_B(i)	check_exp(checkopm(i, iABC), getarg(i, POS_B, SIZE_B))

+#define GETARG_sB(i)	sC2int(GETARG_B(i))

+#define SETARG_B(i,v)	setarg(i, v, POS_B, SIZE_B)

+

+#define GETARG_C(i)	check_exp(checkopm(i, iABC), getarg(i, POS_C, SIZE_C))

+#define GETARG_sC(i)	sC2int(GETARG_C(i))

+#define SETARG_C(i,v)	setarg(i, v, POS_C, SIZE_C)

+

+#define TESTARG_k(i)	check_exp(checkopm(i, iABC), (cast_int(((i) & (1u << POS_k)))))

+#define GETARG_k(i)	check_exp(checkopm(i, iABC), getarg(i, POS_k, 1))

+#define SETARG_k(i,v)	setarg(i, v, POS_k, 1)

+

+#define GETARG_Bx(i)	check_exp(checkopm(i, iABx), getarg(i, POS_Bx, SIZE_Bx))

+#define SETARG_Bx(i,v)	setarg(i, v, POS_Bx, SIZE_Bx)

+

+#define GETARG_Ax(i)	check_exp(checkopm(i, iAx), getarg(i, POS_Ax, SIZE_Ax))

+#define SETARG_Ax(i,v)	setarg(i, v, POS_Ax, SIZE_Ax)

+

+#define GETARG_sBx(i)  \

+	check_exp(checkopm(i, iAsBx), getarg(i, POS_Bx, SIZE_Bx) - OFFSET_sBx)

+#define SETARG_sBx(i,b)	SETARG_Bx((i),cast_uint((b)+OFFSET_sBx))

+

+#define GETARG_sJ(i)  \

+	check_exp(checkopm(i, isJ), getarg(i, POS_sJ, SIZE_sJ) - OFFSET_sJ)

+#define SETARG_sJ(i,j) \

+	setarg(i, cast_uint((j)+OFFSET_sJ), POS_sJ, SIZE_sJ)

+

+

+#define CREATE_ABCk(o,a,b,c,k)	((cast(Instruction, o)<<POS_OP) \

+			| (cast(Instruction, a)<<POS_A) \

+			| (cast(Instruction, b)<<POS_B) \

+			| (cast(Instruction, c)<<POS_C) \

+			| (cast(Instruction, k)<<POS_k))

+

+#define CREATE_ABx(o,a,bc)	((cast(Instruction, o)<<POS_OP) \

+			| (cast(Instruction, a)<<POS_A) \

+			| (cast(Instruction, bc)<<POS_Bx))

+

+#define CREATE_Ax(o,a)		((cast(Instruction, o)<<POS_OP) \

+			| (cast(Instruction, a)<<POS_Ax))

+

+#define CREATE_sJ(o,j,k)	((cast(Instruction, o) << POS_OP) \

+			| (cast(Instruction, j) << POS_sJ) \

+			| (cast(Instruction, k) << POS_k))

+

+

+#if !defined(MAXINDEXRK)  /* (for debugging only) */

+#define MAXINDEXRK	MAXARG_B

+#endif

+

+

+/*

+** invalid register that fits in 8 bits

+*/

+#define NO_REG		MAXARG_A

+

+

+/*

+** R[x] - register

+** K[x] - constant (in constant table)

+** RK(x) == if k(i) then K[x] else R[x]

+*/

+

+

+/*

+** grep "ORDER OP" if you change these enums

+*/

+

+typedef enum {

+/*----------------------------------------------------------------------

+  name		args	description

+------------------------------------------------------------------------*/

+OP_MOVE,/*	A B	R[A] := R[B]					*/

+OP_LOADI,/*	A sBx	R[A] := sBx					*/

+OP_LOADF,/*	A sBx	R[A] := (lua_Number)sBx				*/

+OP_LOADK,/*	A Bx	R[A] := K[Bx]					*/

+OP_LOADKX,/*	A	R[A] := K[extra arg]				*/

+OP_LOADFALSE,/*	A	R[A] := false					*/

+OP_LFALSESKIP,/*A	R[A] := false; pc++				*/

+OP_LOADTRUE,/*	A	R[A] := true					*/

+OP_LOADNIL,/*	A B	R[A], R[A+1], ..., R[A+B] := nil		*/

+OP_GETUPVAL,/*	A B	R[A] := UpValue[B]				*/

+OP_SETUPVAL,/*	A B	UpValue[B] := R[A]				*/

+

+OP_GETTABUP,/*	A B C	R[A] := UpValue[B][K[C]:string]			*/

+OP_GETTABLE,/*	A B C	R[A] := R[B][R[C]]				*/

+OP_GETI,/*	A B C	R[A] := R[B][C]					*/

+OP_GETFIELD,/*	A B C	R[A] := R[B][K[C]:string]			*/

+

+OP_SETTABUP,/*	A B C	UpValue[A][K[B]:string] := RK(C)		*/

+OP_SETTABLE,/*	A B C	R[A][R[B]] := RK(C)				*/

+OP_SETI,/*	A B C	R[A][B] := RK(C)				*/

+OP_SETFIELD,/*	A B C	R[A][K[B]:string] := RK(C)			*/

+

+OP_NEWTABLE,/*	A B C k	R[A] := {}					*/

+

+OP_SELF,/*	A B C	R[A+1] := R[B]; R[A] := R[B][RK(C):string]	*/

+

+OP_ADDI,/*	A B sC	R[A] := R[B] + sC				*/

+

+OP_ADDK,/*	A B C	R[A] := R[B] + K[C]				*/

+OP_SUBK,/*	A B C	R[A] := R[B] - K[C]				*/

+OP_MULK,/*	A B C	R[A] := R[B] * K[C]				*/

+OP_MODK,/*	A B C	R[A] := R[B] % K[C]				*/

+OP_POWK,/*	A B C	R[A] := R[B] ^ K[C]				*/

+OP_DIVK,/*	A B C	R[A] := R[B] / K[C]				*/

+OP_IDIVK,/*	A B C	R[A] := R[B] // K[C]				*/

+

+OP_BANDK,/*	A B C	R[A] := R[B] & K[C]:integer			*/

+OP_BORK,/*	A B C	R[A] := R[B] | K[C]:integer			*/

+OP_BXORK,/*	A B C	R[A] := R[B] ~ K[C]:integer			*/

+

+OP_SHRI,/*	A B sC	R[A] := R[B] >> sC				*/

+OP_SHLI,/*	A B sC	R[A] := sC << R[B]				*/

+

+OP_ADD,/*	A B C	R[A] := R[B] + R[C]				*/

+OP_SUB,/*	A B C	R[A] := R[B] - R[C]				*/

+OP_MUL,/*	A B C	R[A] := R[B] * R[C]				*/

+OP_MOD,/*	A B C	R[A] := R[B] % R[C]				*/

+OP_POW,/*	A B C	R[A] := R[B] ^ R[C]				*/

+OP_DIV,/*	A B C	R[A] := R[B] / R[C]				*/

+OP_IDIV,/*	A B C	R[A] := R[B] // R[C]				*/

+

+OP_BAND,/*	A B C	R[A] := R[B] & R[C]				*/

+OP_BOR,/*	A B C	R[A] := R[B] | R[C]				*/

+OP_BXOR,/*	A B C	R[A] := R[B] ~ R[C]				*/

+OP_SHL,/*	A B C	R[A] := R[B] << R[C]				*/

+OP_SHR,/*	A B C	R[A] := R[B] >> R[C]				*/

+

+OP_MMBIN,/*	A B C	call C metamethod over R[A] and R[B]		*/

+OP_MMBINI,/*	A sB C k	call C metamethod over R[A] and sB	*/

+OP_MMBINK,/*	A B C k		call C metamethod over R[A] and K[B]	*/

+

+OP_UNM,/*	A B	R[A] := -R[B]					*/

+OP_BNOT,/*	A B	R[A] := ~R[B]					*/

+OP_NOT,/*	A B	R[A] := not R[B]				*/

+OP_LEN,/*	A B	R[A] := #R[B] (length operator)			*/

+

+OP_CONCAT,/*	A B	R[A] := R[A].. ... ..R[A + B - 1]		*/

+

+OP_CLOSE,/*	A	close all upvalues >= R[A]			*/

+OP_TBC,/*	A	mark variable A "to be closed"			*/

+OP_JMP,/*	sJ	pc += sJ					*/

+OP_EQ,/*	A B k	if ((R[A] == R[B]) ~= k) then pc++		*/

+OP_LT,/*	A B k	if ((R[A] <  R[B]) ~= k) then pc++		*/

+OP_LE,/*	A B k	if ((R[A] <= R[B]) ~= k) then pc++		*/

+

+OP_EQK,/*	A B k	if ((R[A] == K[B]) ~= k) then pc++		*/

+OP_EQI,/*	A sB k	if ((R[A] == sB) ~= k) then pc++		*/

+OP_LTI,/*	A sB k	if ((R[A] < sB) ~= k) then pc++			*/

+OP_LEI,/*	A sB k	if ((R[A] <= sB) ~= k) then pc++		*/

+OP_GTI,/*	A sB k	if ((R[A] > sB) ~= k) then pc++			*/

+OP_GEI,/*	A sB k	if ((R[A] >= sB) ~= k) then pc++		*/

+

+OP_TEST,/*	A k	if (not R[A] == k) then pc++			*/

+OP_TESTSET,/*	A B k	if (not R[B] == k) then pc++ else R[A] := R[B]	*/

+

+OP_CALL,/*	A B C	R[A], ... ,R[A+C-2] := R[A](R[A+1], ... ,R[A+B-1]) */

+OP_TAILCALL,/*	A B C k	return R[A](R[A+1], ... ,R[A+B-1])		*/

+

+OP_RETURN,/*	A B C k	return R[A], ... ,R[A+B-2]	(see note)	*/

+OP_RETURN0,/*		return						*/

+OP_RETURN1,/*	A	return R[A]					*/

+

+OP_FORLOOP,/*	A Bx	update counters; if loop continues then pc-=Bx; */

+OP_FORPREP,/*	A Bx	<check values and prepare counters>;

+                        if not to run then pc+=Bx+1;			*/

+

+OP_TFORPREP,/*	A Bx	create upvalue for R[A + 3]; pc+=Bx		*/

+OP_TFORCALL,/*	A C	R[A+4], ... ,R[A+3+C] := R[A](R[A+1], R[A+2]);	*/

+OP_TFORLOOP,/*	A Bx	if R[A+2] ~= nil then { R[A]=R[A+2]; pc -= Bx }	*/

+

+OP_SETLIST,/*	A B C k	R[A][C+i] := R[A+i], 1 <= i <= B		*/

+

+OP_CLOSURE,/*	A Bx	R[A] := closure(KPROTO[Bx])			*/

+

+OP_VARARG,/*	A C	R[A], R[A+1], ..., R[A+C-2] = vararg		*/

+

+OP_VARARGPREP,/*A	(adjust vararg parameters)			*/

+

+OP_EXTRAARG/*	Ax	extra (larger) argument for previous opcode	*/

+} OpCode;

+

+

+#define NUM_OPCODES	((int)(OP_EXTRAARG) + 1)

+

+

+

+/*===========================================================================

+  Notes:

+  (*) In OP_CALL, if (B == 0) then B = top - A. If (C == 0), then

+  'top' is set to last_result+1, so next open instruction (OP_CALL,

+  OP_RETURN*, OP_SETLIST) may use 'top'.

+

+  (*) In OP_VARARG, if (C == 0) then use actual number of varargs and

+  set top (like in OP_CALL with C == 0).

+

+  (*) In OP_RETURN, if (B == 0) then return up to 'top'.

+

+  (*) In OP_LOADKX and OP_NEWTABLE, the next instruction is always

+  OP_EXTRAARG.

+

+  (*) In OP_SETLIST, if (B == 0) then real B = 'top'; if k, then

+  real C = EXTRAARG _ C (the bits of EXTRAARG concatenated with the

+  bits of C).

+

+  (*) In OP_NEWTABLE, B is log2 of the hash size (which is always a

+  power of 2) plus 1, or zero for size zero. If not k, the array size

+  is C. Otherwise, the array size is EXTRAARG _ C.

+

+  (*) For comparisons, k specifies what condition the test should accept

+  (true or false).

+

+  (*) In OP_MMBINI/OP_MMBINK, k means the arguments were flipped

+   (the constant is the first operand).

+

+  (*) All 'skips' (pc++) assume that next instruction is a jump.

+

+  (*) In instructions OP_RETURN/OP_TAILCALL, 'k' specifies that the

+  function builds upvalues, which may need to be closed. C > 0 means

+  the function is vararg, so that its 'func' must be corrected before

+  returning; in this case, (C - 1) is its number of fixed parameters.

+

+  (*) In comparisons with an immediate operand, C signals whether the

+  original operand was a float. (It must be corrected in case of

+  metamethods.)

+

+===========================================================================*/

+

+

+/*

+** masks for instruction properties. The format is:

+** bits 0-2: op mode

+** bit 3: instruction set register A

+** bit 4: operator is a test (next instruction must be a jump)

+** bit 5: instruction uses 'L->top' set by previous instruction (when B == 0)

+** bit 6: instruction sets 'L->top' for next instruction (when C == 0)

+** bit 7: instruction is an MM instruction (call a metamethod)

+*/

+

+LUAI_DDEC(const lu_byte luaP_opmodes[NUM_OPCODES];)

+

+#define getOpMode(m)	(cast(enum OpMode, luaP_opmodes[m] & 7))

+#define testAMode(m)	(luaP_opmodes[m] & (1 << 3))

+#define testTMode(m)	(luaP_opmodes[m] & (1 << 4))

+#define testITMode(m)	(luaP_opmodes[m] & (1 << 5))

+#define testOTMode(m)	(luaP_opmodes[m] & (1 << 6))

+#define testMMMode(m)	(luaP_opmodes[m] & (1 << 7))

+

+/* "out top" (set top for next instruction) */

+#define isOT(i)  \

+	((testOTMode(GET_OPCODE(i)) && GETARG_C(i) == 0) || \

+          GET_OPCODE(i) == OP_TAILCALL)

+

+/* "in top" (uses top from previous instruction) */

+#define isIT(i)		(testITMode(GET_OPCODE(i)) && GETARG_B(i) == 0)

+

+#define opmode(mm,ot,it,t,a,m)  \

+    (((mm) << 7) | ((ot) << 6) | ((it) << 5) | ((t) << 4) | ((a) << 3) | (m))

+

+

+/* number of list items to accumulate before a SETLIST instruction */

+#define LFIELDS_PER_FLUSH	50

+

+#endif

--- /dev/null

+++ b/lopnames.h

@@ -1,0 +1,103 @@

+/*

+** $Id: lopnames.h $

+** Opcode names

+** See Copyright Notice in lua.h

+*/

+

+#if !defined(lopnames_h)

+#define lopnames_h

+

+#include <stddef.h>

+

+

+/* ORDER OP */

+

+static const char *const opnames[] = {

+  "MOVE",

+  "LOADI",

+  "LOADF",

+  "LOADK",

+  "LOADKX",

+  "LOADFALSE",

+  "LFALSESKIP",

+  "LOADTRUE",

+  "LOADNIL",

+  "GETUPVAL",

+  "SETUPVAL",

+  "GETTABUP",

+  "GETTABLE",

+  "GETI",

+  "GETFIELD",

+  "SETTABUP",

+  "SETTABLE",

+  "SETI",

+  "SETFIELD",

+  "NEWTABLE",

+  "SELF",

+  "ADDI",

+  "ADDK",

+  "SUBK",

+  "MULK",

+  "MODK",

+  "POWK",

+  "DIVK",

+  "IDIVK",

+  "BANDK",

+  "BORK",

+  "BXORK",

+  "SHRI",

+  "SHLI",

+  "ADD",

+  "SUB",

+  "MUL",

+  "MOD",

+  "POW",

+  "DIV",

+  "IDIV",

+  "BAND",

+  "BOR",

+  "BXOR",

+  "SHL",

+  "SHR",

+  "MMBIN",

+  "MMBINI",

+  "MMBINK",

+  "UNM",

+  "BNOT",

+  "NOT",

+  "LEN",

+  "CONCAT",

+  "CLOSE",

+  "TBC",

+  "JMP",

+  "EQ",

+  "LT",

+  "LE",

+  "EQK",

+  "EQI",

+  "LTI",

+  "LEI",

+  "GTI",

+  "GEI",

+  "TEST",

+  "TESTSET",

+  "CALL",

+  "TAILCALL",

+  "RETURN",

+  "RETURN0",

+  "RETURN1",

+  "FORLOOP",

+  "FORPREP",

+  "TFORPREP",

+  "TFORCALL",

+  "TFORLOOP",

+  "SETLIST",

+  "CLOSURE",

+  "VARARG",

+  "VARARGPREP",

+  "EXTRAARG",

+  NULL

+};

+

+#endif

+

--- /dev/null

+++ b/loslib.c

@@ -1,0 +1,430 @@

+/*

+** $Id: loslib.c $

+** Standard Operating System library

+** See Copyright Notice in lua.h

+*/

+

+#define loslib_c

+#define LUA_LIB

+

+#include "lprefix.h"

+

+

+#include <errno.h>

+#include <locale.h>

+#include <stdlib.h>

+#include <string.h>

+#include <time.h>

+

+#include "lua.h"

+

+#include "lauxlib.h"

+#include "lualib.h"

+

+

+/*

+** {==================================================================

+** List of valid conversion specifiers for the 'strftime' function;

+** options are grouped by length; group of length 2 start with '||'.

+** ===================================================================

+*/

+#if !defined(LUA_STRFTIMEOPTIONS)	/* { */

+

+/* options for ANSI C 89 (only 1-char options) */

+#define L_STRFTIMEC89		"aAbBcdHIjmMpSUwWxXyYZ%"

+

+/* options for ISO C 99 and POSIX */

+#define L_STRFTIMEC99 "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%" \

+    "||" "EcECExEXEyEY" "OdOeOHOIOmOMOSOuOUOVOwOWOy"  /* two-char options */

+

+/* options for Windows */

+#define L_STRFTIMEWIN "aAbBcdHIjmMpSUwWxXyYzZ%" \

+    "||" "#c#x#d#H#I#j#m#M#S#U#w#W#y#Y"  /* two-char options */

+

+#if defined(LUA_USE_WINDOWS)

+#define LUA_STRFTIMEOPTIONS	L_STRFTIMEWIN

+#elif defined(LUA_USE_C89)

+#define LUA_STRFTIMEOPTIONS	L_STRFTIMEC89

+#else  /* C99 specification */

+#define LUA_STRFTIMEOPTIONS	L_STRFTIMEC99

+#endif

+

+#endif					/* } */

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Configuration for time-related stuff

+** ===================================================================

+*/

+

+/*

+** type to represent time_t in Lua

+*/

+#if !defined(LUA_NUMTIME)	/* { */

+

+#define l_timet			lua_Integer

+#define l_pushtime(L,t)		lua_pushinteger(L,(lua_Integer)(t))

+#define l_gettime(L,arg)	luaL_checkinteger(L, arg)

+

+#else				/* }{ */

+

+#define l_timet			lua_Number

+#define l_pushtime(L,t)		lua_pushnumber(L,(lua_Number)(t))

+#define l_gettime(L,arg)	luaL_checknumber(L, arg)

+

+#endif				/* } */

+

+

+#if !defined(l_gmtime)		/* { */

+/*

+** By default, Lua uses gmtime/localtime, except when POSIX is available,

+** where it uses gmtime_r/localtime_r

+*/

+

+#if defined(LUA_USE_POSIX)	/* { */

+

+#define l_gmtime(t,r)		gmtime_r(t,r)

+#define l_localtime(t,r)	localtime_r(t,r)

+

+#else				/* }{ */

+

+/* ISO C definitions */

+#define l_gmtime(t,r)		((void)(r)->tm_sec, gmtime(t))

+#define l_localtime(t,r)	((void)(r)->tm_sec, localtime(t))

+

+#endif				/* } */

+

+#endif				/* } */

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Configuration for 'tmpnam':

+** By default, Lua uses tmpnam except when POSIX is available, where

+** it uses mkstemp.

+** ===================================================================

+*/

+#if !defined(lua_tmpnam)	/* { */

+

+#if defined(LUA_USE_POSIX)	/* { */

+

+#include <unistd.h>

+

+#define LUA_TMPNAMBUFSIZE	32

+

+#if !defined(LUA_TMPNAMTEMPLATE)

+#define LUA_TMPNAMTEMPLATE	"/tmp/lua_XXXXXX"

+#endif

+

+#define lua_tmpnam(b,e) { \

+        strcpy(b, LUA_TMPNAMTEMPLATE); \

+        e = mkstemp(b); \

+        if (e != -1) close(e); \

+        e = (e == -1); }

+

+#else				/* }{ */

+

+/* ISO C definitions */

+#define LUA_TMPNAMBUFSIZE	L_tmpnam

+#define lua_tmpnam(b,e)		{ e = (tmpnam(b) == NULL); }

+

+#endif				/* } */

+

+#endif				/* } */

+/* }================================================================== */

+

+

+

+static int os_execute (lua_State *L) {

+  const char *cmd = luaL_optstring(L, 1, NULL);

+  int stat;

+  errno = 0;

+  stat = system(cmd);

+  if (cmd != NULL)

+    return luaL_execresult(L, stat);

+  else {

+    lua_pushboolean(L, stat);  /* true if there is a shell */

+    return 1;

+  }

+}

+

+

+static int os_remove (lua_State *L) {

+  const char *filename = luaL_checkstring(L, 1);

+  return luaL_fileresult(L, remove(filename) == 0, filename);

+}

+

+

+static int os_rename (lua_State *L) {

+  const char *fromname = luaL_checkstring(L, 1);

+  const char *toname = luaL_checkstring(L, 2);

+  return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);

+}

+

+

+static int os_tmpname (lua_State *L) {

+  char buff[LUA_TMPNAMBUFSIZE];

+  int err;

+  lua_tmpnam(buff, err);

+  if (err)

+    return luaL_error(L, "unable to generate a unique filename");

+  lua_pushstring(L, buff);

+  return 1;

+}

+

+

+static int os_getenv (lua_State *L) {

+  lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */

+  return 1;

+}

+

+

+static int os_clock (lua_State *L) {

+  lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);

+  return 1;

+}

+

+

+/*

+** {======================================================

+** Time/Date operations

+** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,

+**   wday=%w+1, yday=%j, isdst=? }

+** =======================================================

+*/

+

+/*

+** About the overflow check: an overflow cannot occur when time

+** is represented by a lua_Integer, because either lua_Integer is

+** large enough to represent all int fields or it is not large enough

+** to represent a time that cause a field to overflow.  However, if

+** times are represented as doubles and lua_Integer is int, then the

+** time 0x1.e1853b0d184f6p+55 would cause an overflow when adding 1900

+** to compute the year.

+*/

+static void setfield (lua_State *L, const char *key, int value, int delta) {

+  #if (defined(LUA_NUMTIME) && LUA_MAXINTEGER <= INT_MAX)

+    if (value > LUA_MAXINTEGER - delta)

+      luaL_error(L, "field '%s' is out-of-bound", key);

+  #endif

+  lua_pushinteger(L, (lua_Integer)value + delta);

+  lua_setfield(L, -2, key);

+}

+

+

+static void setboolfield (lua_State *L, const char *key, int value) {

+  if (value < 0)  /* undefined? */

+    return;  /* does not set field */

+  lua_pushboolean(L, value);

+  lua_setfield(L, -2, key);

+}

+

+

+/*

+** Set all fields from structure 'tm' in the table on top of the stack

+*/

+static void setallfields (lua_State *L, struct tm *stm) {

+  setfield(L, "year", stm->tm_year, 1900);

+  setfield(L, "month", stm->tm_mon, 1);

+  setfield(L, "day", stm->tm_mday, 0);

+  setfield(L, "hour", stm->tm_hour, 0);

+  setfield(L, "min", stm->tm_min, 0);

+  setfield(L, "sec", stm->tm_sec, 0);

+  setfield(L, "yday", stm->tm_yday, 1);

+  setfield(L, "wday", stm->tm_wday, 1);

+  setboolfield(L, "isdst", stm->tm_isdst);

+}

+

+

+static int getboolfield (lua_State *L, const char *key) {

+  int res;

+  res = (lua_getfield(L, -1, key) == LUA_TNIL) ? -1 : lua_toboolean(L, -1);

+  lua_pop(L, 1);

+  return res;

+}

+

+

+static int getfield (lua_State *L, const char *key, int d, int delta) {

+  int isnum;

+  int t = lua_getfield(L, -1, key);  /* get field and its type */

+  lua_Integer res = lua_tointegerx(L, -1, &isnum);

+  if (!isnum) {  /* field is not an integer? */

+    if (t != LUA_TNIL)  /* some other value? */

+      return luaL_error(L, "field '%s' is not an integer", key);

+    else if (d < 0)  /* absent field; no default? */

+      return luaL_error(L, "field '%s' missing in date table", key);

+    res = d;

+  }

+  else {

+    /* unsigned avoids overflow when lua_Integer has 32 bits */

+    if (!(res >= 0 ? (lua_Unsigned)res <= (lua_Unsigned)INT_MAX + delta

+                   : (lua_Integer)INT_MIN + delta <= res))

+      return luaL_error(L, "field '%s' is out-of-bound", key);

+    res -= delta;

+  }

+  lua_pop(L, 1);

+  return (int)res;

+}

+

+

+static const char *checkoption (lua_State *L, const char *conv,

+                                ptrdiff_t convlen, char *buff) {

+  const char *option = LUA_STRFTIMEOPTIONS;

+  int oplen = 1;  /* length of options being checked */

+  for (; *option != '\0' && oplen <= convlen; option += oplen) {

+    if (*option == '|')  /* next block? */

+      oplen++;  /* will check options with next length (+1) */

+    else if (memcmp(conv, option, oplen) == 0) {  /* match? */

+      memcpy(buff, conv, oplen);  /* copy valid option to buffer */

+      buff[oplen] = '\0';

+      return conv + oplen;  /* return next item */

+    }

+  }

+  luaL_argerror(L, 1,

+    lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));

+  return conv;  /* to avoid warnings */

+}

+

+

+static time_t l_checktime (lua_State *L, int arg) {

+  l_timet t = l_gettime(L, arg);

+  luaL_argcheck(L, (time_t)t == t, arg, "time out-of-bounds");

+  return (time_t)t;

+}

+

+

+/* maximum size for an individual 'strftime' item */

+#define SIZETIMEFMT	250

+

+

+static int os_date (lua_State *L) {

+  size_t slen;

+  const char *s = luaL_optlstring(L, 1, "%c", &slen);

+  time_t t = luaL_opt(L, l_checktime, 2, time(NULL));

+  const char *se = s + slen;  /* 's' end */

+  struct tm tmr, *stm;

+  if (*s == '!') {  /* UTC? */

+    stm = l_gmtime(&t, &tmr);

+    s++;  /* skip '!' */

+  }

+  else

+    stm = l_localtime(&t, &tmr);

+  if (stm == NULL)  /* invalid date? */

+    return luaL_error(L,

+                 "date result cannot be represented in this installation");

+  if (strcmp(s, "*t") == 0) {

+    lua_createtable(L, 0, 9);  /* 9 = number of fields */

+    setallfields(L, stm);

+  }

+  else {

+    char cc[4];  /* buffer for individual conversion specifiers */

+    luaL_Buffer b;

+    cc[0] = '%';

+    luaL_buffinit(L, &b);

+    while (s < se) {

+      if (*s != '%')  /* not a conversion specifier? */

+        luaL_addchar(&b, *s++);

+      else {

+        size_t reslen;

+        char *buff = luaL_prepbuffsize(&b, SIZETIMEFMT);

+        s++;  /* skip '%' */

+        s = checkoption(L, s, se - s, cc + 1);  /* copy specifier to 'cc' */

+        reslen = strftime(buff, SIZETIMEFMT, cc, stm);

+        luaL_addsize(&b, reslen);

+      }

+    }

+    luaL_pushresult(&b);

+  }

+  return 1;

+}

+

+

+static int os_time (lua_State *L) {

+  time_t t;

+  if (lua_isnoneornil(L, 1))  /* called without args? */

+    t = time(NULL);  /* get current time */

+  else {

+    struct tm ts;

+    luaL_checktype(L, 1, LUA_TTABLE);

+    lua_settop(L, 1);  /* make sure table is at the top */

+    ts.tm_year = getfield(L, "year", -1, 1900);

+    ts.tm_mon = getfield(L, "month", -1, 1);

+    ts.tm_mday = getfield(L, "day", -1, 0);

+    ts.tm_hour = getfield(L, "hour", 12, 0);

+    ts.tm_min = getfield(L, "min", 0, 0);

+    ts.tm_sec = getfield(L, "sec", 0, 0);

+    ts.tm_isdst = getboolfield(L, "isdst");

+    t = mktime(&ts);

+    setallfields(L, &ts);  /* update fields with normalized values */

+  }

+  if (t != (time_t)(l_timet)t || t == (time_t)(-1))

+    return luaL_error(L,

+                  "time result cannot be represented in this installation");

+  l_pushtime(L, t);

+  return 1;

+}

+

+

+static int os_difftime (lua_State *L) {

+  time_t t1 = l_checktime(L, 1);

+  time_t t2 = l_checktime(L, 2);

+  lua_pushnumber(L, (lua_Number)difftime(t1, t2));

+  return 1;

+}

+

+/* }====================================================== */

+

+

+static int os_setlocale (lua_State *L) {

+  static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,

+                      LC_NUMERIC, LC_TIME};

+  static const char *const catnames[] = {"all", "collate", "ctype", "monetary",

+     "numeric", "time", NULL};

+  const char *l = luaL_optstring(L, 1, NULL);

+  int op = luaL_checkoption(L, 2, "all", catnames);

+  lua_pushstring(L, setlocale(cat[op], l));

+  return 1;

+}

+

+

+static int os_exit (lua_State *L) {

+  int status;

+  if (lua_isboolean(L, 1))

+    status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);

+  else

+    status = (int)luaL_optinteger(L, 1, EXIT_SUCCESS);

+  if (lua_toboolean(L, 2))

+    lua_close(L);

+  if (L) exit(status);  /* 'if' to avoid warnings for unreachable 'return' */

+  return 0;

+}

+

+

+static const luaL_Reg syslib[] = {

+  {"clock",     os_clock},

+  {"date",      os_date},

+  {"difftime",  os_difftime},

+  {"execute",   os_execute},

+  {"exit",      os_exit},

+  {"getenv",    os_getenv},

+  {"remove",    os_remove},

+  {"rename",    os_rename},

+  {"setlocale", os_setlocale},

+  {"time",      os_time},

+  {"tmpname",   os_tmpname},

+  {NULL, NULL}

+};

+

+/* }====================================================== */

+

+

+

+LUAMOD_API int luaopen_os (lua_State *L) {

+  luaL_newlib(L, syslib);

+  return 1;

+}

+

--- /dev/null

+++ b/lparser.c

@@ -1,0 +1,1956 @@

+/*

+** $Id: lparser.c $

+** Lua Parser

+** See Copyright Notice in lua.h

+*/

+

+#define lparser_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <limits.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "lcode.h"

+#include "ldebug.h"

+#include "ldo.h"

+#include "lfunc.h"

+#include "llex.h"

+#include "lmem.h"

+#include "lobject.h"

+#include "lopcodes.h"

+#include "lparser.h"

+#include "lstate.h"

+#include "lstring.h"

+#include "ltable.h"

+

+

+

+/* maximum number of local variables per function (must be smaller

+   than 250, due to the bytecode format) */

+#define MAXVARS		200

+

+

+#define hasmultret(k)		((k) == VCALL || (k) == VVARARG)

+

+

+/* because all strings are unified by the scanner, the parser

+   can use pointer equality for string equality */

+#define eqstr(a,b)	((a) == (b))

+

+

+/*

+** nodes for block list (list of active blocks)

+*/

+typedef struct BlockCnt {

+  struct BlockCnt *previous;  /* chain */

+  int firstlabel;  /* index of first label in this block */

+  int firstgoto;  /* index of first pending goto in this block */

+  lu_byte nactvar;  /* # active locals outside the block */

+  lu_byte upval;  /* true if some variable in the block is an upvalue */

+  lu_byte isloop;  /* true if 'block' is a loop */

+  lu_byte insidetbc;  /* true if inside the scope of a to-be-closed var. */

+} BlockCnt;

+

+

+

+/*

+** prototypes for recursive non-terminal functions

+*/

+static void statement (LexState *ls);

+static void expr (LexState *ls, expdesc *v);

+

+

+static l_noret error_expected (LexState *ls, int token) {

+  luaX_syntaxerror(ls,

+      luaO_pushfstring(ls->L, "%s expected", luaX_token2str(ls, token)));

+}

+

+

+static l_noret errorlimit (FuncState *fs, int limit, const char *what) {

+  lua_State *L = fs->ls->L;

+  const char *msg;

+  int line = fs->f->linedefined;

+  const char *where = (line == 0)

+                      ? "main function"

+                      : luaO_pushfstring(L, "function at line %d", line);

+  msg = luaO_pushfstring(L, "too many %s (limit is %d) in %s",

+                             what, limit, where);

+  luaX_syntaxerror(fs->ls, msg);

+}

+

+

+static void checklimit (FuncState *fs, int v, int l, const char *what) {

+  if (v > l) errorlimit(fs, l, what);

+}

+

+

+/*

+** Test whether next token is 'c'; if so, skip it.

+*/

+static int testnext (LexState *ls, int c) {

+  if (ls->t.token == c) {

+    luaX_next(ls);

+    return 1;

+  }

+  else return 0;

+}

+

+

+/*

+** Check that next token is 'c'.

+*/

+static void check (LexState *ls, int c) {

+  if (ls->t.token != c)

+    error_expected(ls, c);

+}

+

+

+/*

+** Check that next token is 'c' and skip it.

+*/

+static void checknext (LexState *ls, int c) {

+  check(ls, c);

+  luaX_next(ls);

+}

+

+

+#define check_condition(ls,c,msg)	{ if (!(c)) luaX_syntaxerror(ls, msg); }

+

+

+/*

+** Check that next token is 'what' and skip it. In case of error,

+** raise an error that the expected 'what' should match a 'who'

+** in line 'where' (if that is not the current line).

+*/

+static void check_match (LexState *ls, int what, int who, int where) {

+  if (unlikely(!testnext(ls, what))) {

+    if (where == ls->linenumber)  /* all in the same line? */

+      error_expected(ls, what);  /* do not need a complex message */

+    else {

+      luaX_syntaxerror(ls, luaO_pushfstring(ls->L,

+             "%s expected (to close %s at line %d)",

+              luaX_token2str(ls, what), luaX_token2str(ls, who), where));

+    }

+  }

+}

+

+

+static TString *str_checkname (LexState *ls) {

+  TString *ts;

+  check(ls, TK_NAME);

+  ts = ls->t.seminfo.ts;

+  luaX_next(ls);

+  return ts;

+}

+

+

+static void init_exp (expdesc *e, expkind k, int i) {

+  e->f = e->t = NO_JUMP;

+  e->k = k;

+  e->u.info = i;

+}

+

+

+static void codestring (expdesc *e, TString *s) {

+  e->f = e->t = NO_JUMP;

+  e->k = VKSTR;

+  e->u.strval = s;

+}

+

+

+static void codename (LexState *ls, expdesc *e) {

+  codestring(e, str_checkname(ls));

+}

+

+

+/*

+** Register a new local variable in the active 'Proto' (for debug

+** information).

+*/

+static int registerlocalvar (LexState *ls, FuncState *fs, TString *varname) {

+  Proto *f = fs->f;

+  int oldsize = f->sizelocvars;

+  luaM_growvector(ls->L, f->locvars, fs->ndebugvars, f->sizelocvars,

+                  LocVar, SHRT_MAX, "local variables");

+  while (oldsize < f->sizelocvars)

+    f->locvars[oldsize++].varname = NULL;

+  f->locvars[fs->ndebugvars].varname = varname;

+  f->locvars[fs->ndebugvars].startpc = fs->pc;

+  luaC_objbarrier(ls->L, f, varname);

+  return fs->ndebugvars++;

+}

+

+

+/*

+** Create a new local variable with the given 'name'. Return its index

+** in the function.

+*/

+static int new_localvar (LexState *ls, TString *name) {

+  lua_State *L = ls->L;

+  FuncState *fs = ls->fs;

+  Dyndata *dyd = ls->dyd;

+  Vardesc *var;

+  checklimit(fs, dyd->actvar.n + 1 - fs->firstlocal,

+                 MAXVARS, "local variables");

+  luaM_growvector(L, dyd->actvar.arr, dyd->actvar.n + 1,

+                  dyd->actvar.size, Vardesc, USHRT_MAX, "local variables");

+  var = &dyd->actvar.arr[dyd->actvar.n++];

+  var->vd.kind = VDKREG;  /* default */

+  var->vd.name = name;

+  return dyd->actvar.n - 1 - fs->firstlocal;

+}

+

+#define new_localvarliteral(ls,v) \

+    new_localvar(ls,  \

+      luaX_newstring(ls, "" v, (sizeof(v)/sizeof(char)) - 1));

+

+

+

+/*

+** Return the "variable description" (Vardesc) of a given variable.

+** (Unless noted otherwise, all variables are referred to by their

+** compiler indices.)

+*/

+static Vardesc *getlocalvardesc (FuncState *fs, int vidx) {

+  return &fs->ls->dyd->actvar.arr[fs->firstlocal + vidx];

+}

+

+

+/*

+** Convert 'nvar', a compiler index level, to it corresponding

+** stack index level. For that, search for the highest variable

+** below that level that is in the stack and uses its stack

+** index ('sidx').

+*/

+static int stacklevel (FuncState *fs, int nvar) {

+  while (nvar-- > 0) {

+    Vardesc *vd = getlocalvardesc(fs, nvar);  /* get variable */

+    if (vd->vd.kind != RDKCTC)  /* is in the stack? */

+      return vd->vd.sidx + 1;

+  }

+  return 0;  /* no variables in the stack */

+}

+

+

+/*

+** Return the number of variables in the stack for function 'fs'

+*/

+int luaY_nvarstack (FuncState *fs) {

+  return stacklevel(fs, fs->nactvar);

+}

+

+

+/*

+** Get the debug-information entry for current variable 'vidx'.

+*/

+static LocVar *localdebuginfo (FuncState *fs, int vidx) {

+  Vardesc *vd = getlocalvardesc(fs,  vidx);

+  if (vd->vd.kind == RDKCTC)

+    return NULL;  /* no debug info. for constants */

+  else {

+    int idx = vd->vd.pidx;

+    lua_assert(idx < fs->ndebugvars);

+    return &fs->f->locvars[idx];

+  }

+}

+

+

+/*

+** Create an expression representing variable 'vidx'

+*/

+static void init_var (FuncState *fs, expdesc *e, int vidx) {

+  e->f = e->t = NO_JUMP;

+  e->k = VLOCAL;

+  e->u.var.vidx = vidx;

+  e->u.var.sidx = getlocalvardesc(fs, vidx)->vd.sidx;

+}

+

+

+/*

+** Raises an error if variable described by 'e' is read only

+*/

+static void check_readonly (LexState *ls, expdesc *e) {

+  FuncState *fs = ls->fs;

+  TString *varname = NULL;  /* to be set if variable is const */

+  switch (e->k) {

+    case VCONST: {

+      varname = ls->dyd->actvar.arr[e->u.info].vd.name;

+      break;

+    }

+    case VLOCAL: {

+      Vardesc *vardesc = getlocalvardesc(fs, e->u.var.vidx);

+      if (vardesc->vd.kind != VDKREG)  /* not a regular variable? */

+        varname = vardesc->vd.name;

+      break;

+    }

+    case VUPVAL: {

+      Upvaldesc *up = &fs->f->upvalues[e->u.info];

+      if (up->kind != VDKREG)

+        varname = up->name;

+      break;

+    }

+    default:

+      return;  /* other cases cannot be read-only */

+  }

+  if (varname) {

+    const char *msg = luaO_pushfstring(ls->L,

+       "attempt to assign to const variable '%s'", getstr(varname));

+    luaK_semerror(ls, msg);  /* error */

+  }

+}

+

+

+/*

+** Start the scope for the last 'nvars' created variables.

+*/

+static void adjustlocalvars (LexState *ls, int nvars) {

+  FuncState *fs = ls->fs;

+  int stklevel = luaY_nvarstack(fs);

+  int i;

+  for (i = 0; i < nvars; i++) {

+    int vidx = fs->nactvar++;

+    Vardesc *var = getlocalvardesc(fs, vidx);

+    var->vd.sidx = stklevel++;

+    var->vd.pidx = registerlocalvar(ls, fs, var->vd.name);

+  }

+}

+

+

+/*

+** Close the scope for all variables up to level 'tolevel'.

+** (debug info.)

+*/

+static void removevars (FuncState *fs, int tolevel) {

+  fs->ls->dyd->actvar.n -= (fs->nactvar - tolevel);

+  while (fs->nactvar > tolevel) {

+    LocVar *var = localdebuginfo(fs, --fs->nactvar);

+    if (var)  /* does it have debug information? */

+      var->endpc = fs->pc;

+  }

+}

+

+

+/*

+** Search the upvalues of the function 'fs' for one

+** with the given 'name'.

+*/

+static int searchupvalue (FuncState *fs, TString *name) {

+  int i;

+  Upvaldesc *up = fs->f->upvalues;

+  for (i = 0; i < fs->nups; i++) {

+    if (eqstr(up[i].name, name)) return i;

+  }

+  return -1;  /* not found */

+}

+

+

+static Upvaldesc *allocupvalue (FuncState *fs) {

+  Proto *f = fs->f;

+  int oldsize = f->sizeupvalues;

+  checklimit(fs, fs->nups + 1, MAXUPVAL, "upvalues");

+  luaM_growvector(fs->ls->L, f->upvalues, fs->nups, f->sizeupvalues,

+                  Upvaldesc, MAXUPVAL, "upvalues");

+  while (oldsize < f->sizeupvalues)

+    f->upvalues[oldsize++].name = NULL;

+  return &f->upvalues[fs->nups++];

+}

+

+

+static int newupvalue (FuncState *fs, TString *name, expdesc *v) {

+  Upvaldesc *up = allocupvalue(fs);

+  FuncState *prev = fs->prev;

+  if (v->k == VLOCAL) {

+    up->instack = 1;

+    up->idx = v->u.var.sidx;

+    up->kind = getlocalvardesc(prev, v->u.var.vidx)->vd.kind;

+    lua_assert(eqstr(name, getlocalvardesc(prev, v->u.var.vidx)->vd.name));

+  }

+  else {

+    up->instack = 0;

+    up->idx = cast_byte(v->u.info);

+    up->kind = prev->f->upvalues[v->u.info].kind;

+    lua_assert(eqstr(name, prev->f->upvalues[v->u.info].name));

+  }

+  up->name = name;

+  luaC_objbarrier(fs->ls->L, fs->f, name);

+  return fs->nups - 1;

+}

+

+

+/*

+** Look for an active local variable with the name 'n' in the

+** function 'fs'. If found, initialize 'var' with it and return

+** its expression kind; otherwise return -1.

+*/

+static int searchvar (FuncState *fs, TString *n, expdesc *var) {

+  int i;

+  for (i = cast_int(fs->nactvar) - 1; i >= 0; i--) {

+    Vardesc *vd = getlocalvardesc(fs, i);

+    if (eqstr(n, vd->vd.name)) {  /* found? */

+      if (vd->vd.kind == RDKCTC)  /* compile-time constant? */

+        init_exp(var, VCONST, fs->firstlocal + i);

+      else  /* real variable */

+        init_var(fs, var, i);

+      return var->k;

+    }

+  }

+  return -1;  /* not found */

+}

+

+

+/*

+** Mark block where variable at given level was defined

+** (to emit close instructions later).

+*/

+static void markupval (FuncState *fs, int level) {

+  BlockCnt *bl = fs->bl;

+  while (bl->nactvar > level)

+    bl = bl->previous;

+  bl->upval = 1;

+  fs->needclose = 1;

+}

+

+

+/*

+** Find a variable with the given name 'n'. If it is an upvalue, add

+** this upvalue into all intermediate functions. If it is a global, set

+** 'var' as 'void' as a flag.

+*/

+static void singlevaraux (FuncState *fs, TString *n, expdesc *var, int base) {

+  if (fs == NULL)  /* no more levels? */

+    init_exp(var, VVOID, 0);  /* default is global */

+  else {

+    int v = searchvar(fs, n, var);  /* look up locals at current level */

+    if (v >= 0) {  /* found? */

+      if (v == VLOCAL && !base)

+        markupval(fs, var->u.var.vidx);  /* local will be used as an upval */

+    }

+    else {  /* not found as local at current level; try upvalues */

+      int idx = searchupvalue(fs, n);  /* try existing upvalues */

+      if (idx < 0) {  /* not found? */

+        singlevaraux(fs->prev, n, var, 0);  /* try upper levels */

+        if (var->k == VLOCAL || var->k == VUPVAL)  /* local or upvalue? */

+          idx  = newupvalue(fs, n, var);  /* will be a new upvalue */

+        else  /* it is a global or a constant */

+          return;  /* don't need to do anything at this level */

+      }

+      init_exp(var, VUPVAL, idx);  /* new or old upvalue */

+    }

+  }

+}

+

+

+/*

+** Find a variable with the given name 'n', handling global variables

+** too.

+*/

+static void singlevar (LexState *ls, expdesc *var) {

+  TString *varname = str_checkname(ls);

+  FuncState *fs = ls->fs;

+  singlevaraux(fs, varname, var, 1);

+  if (var->k == VVOID) {  /* global name? */

+    expdesc key;

+    singlevaraux(fs, ls->envn, var, 1);  /* get environment variable */

+    lua_assert(var->k != VVOID);  /* this one must exist */

+    codestring(&key, varname);  /* key is variable name */

+    luaK_indexed(fs, var, &key);  /* env[varname] */

+  }

+}

+

+

+/*

+** Adjust the number of results from an expression list 'e' with 'nexps'

+** expressions to 'nvars' values.

+*/

+static void adjust_assign (LexState *ls, int nvars, int nexps, expdesc *e) {

+  FuncState *fs = ls->fs;

+  int needed = nvars - nexps;  /* extra values needed */

+  if (hasmultret(e->k)) {  /* last expression has multiple returns? */

+    int extra = needed + 1;  /* discount last expression itself */

+    if (extra < 0)

+      extra = 0;

+    luaK_setreturns(fs, e, extra);  /* last exp. provides the difference */

+  }

+  else {

+    if (e->k != VVOID)  /* at least one expression? */

+      luaK_exp2nextreg(fs, e);  /* close last expression */

+    if (needed > 0)  /* missing values? */

+      luaK_nil(fs, fs->freereg, needed);  /* complete with nils */

+  }

+  if (needed > 0)

+    luaK_reserveregs(fs, needed);  /* registers for extra values */

+  else  /* adding 'needed' is actually a subtraction */

+    fs->freereg += needed;  /* remove extra values */

+}

+

+

+#define enterlevel(ls)	luaE_incCstack(ls->L)

+

+

+#define leavelevel(ls) ((ls)->L->nCcalls--)

+

+

+/*

+** Generates an error that a goto jumps into the scope of some

+** local variable.

+*/

+static l_noret jumpscopeerror (LexState *ls, Labeldesc *gt) {

+  const char *varname = getstr(getlocalvardesc(ls->fs, gt->nactvar)->vd.name);

+  const char *msg = "<goto %s> at line %d jumps into the scope of local '%s'";

+  msg = luaO_pushfstring(ls->L, msg, getstr(gt->name), gt->line, varname);

+  luaK_semerror(ls, msg);  /* raise the error */

+}

+

+

+/*

+** Solves the goto at index 'g' to given 'label' and removes it

+** from the list of pending goto's.

+** If it jumps into the scope of some variable, raises an error.

+*/

+static void solvegoto (LexState *ls, int g, Labeldesc *label) {

+  int i;

+  Labellist *gl = &ls->dyd->gt;  /* list of goto's */

+  Labeldesc *gt = &gl->arr[g];  /* goto to be resolved */

+  lua_assert(eqstr(gt->name, label->name));

+  if (unlikely(gt->nactvar < label->nactvar))  /* enter some scope? */

+    jumpscopeerror(ls, gt);

+  luaK_patchlist(ls->fs, gt->pc, label->pc);

+  for (i = g; i < gl->n - 1; i++)  /* remove goto from pending list */

+    gl->arr[i] = gl->arr[i + 1];

+  gl->n--;

+}

+

+

+/*

+** Search for an active label with the given name.

+*/

+static Labeldesc *findlabel (LexState *ls, TString *name) {

+  int i;

+  Dyndata *dyd = ls->dyd;

+  /* check labels in current function for a match */

+  for (i = ls->fs->firstlabel; i < dyd->label.n; i++) {

+    Labeldesc *lb = &dyd->label.arr[i];

+    if (eqstr(lb->name, name))  /* correct label? */

+      return lb;

+  }

+  return NULL;  /* label not found */

+}

+

+

+/*

+** Adds a new label/goto in the corresponding list.

+*/

+static int newlabelentry (LexState *ls, Labellist *l, TString *name,

+                          int line, int pc) {

+  int n = l->n;

+  luaM_growvector(ls->L, l->arr, n, l->size,

+                  Labeldesc, SHRT_MAX, "labels/gotos");

+  l->arr[n].name = name;

+  l->arr[n].line = line;

+  l->arr[n].nactvar = ls->fs->nactvar;

+  l->arr[n].close = 0;

+  l->arr[n].pc = pc;

+  l->n = n + 1;

+  return n;

+}

+

+

+static int newgotoentry (LexState *ls, TString *name, int line, int pc) {

+  return newlabelentry(ls, &ls->dyd->gt, name, line, pc);

+}

+

+

+/*

+** Solves forward jumps. Check whether new label 'lb' matches any

+** pending gotos in current block and solves them. Return true

+** if any of the goto's need to close upvalues.

+*/

+static int solvegotos (LexState *ls, Labeldesc *lb) {

+  Labellist *gl = &ls->dyd->gt;

+  int i = ls->fs->bl->firstgoto;

+  int needsclose = 0;

+  while (i < gl->n) {

+    if (eqstr(gl->arr[i].name, lb->name)) {

+      needsclose |= gl->arr[i].close;

+      solvegoto(ls, i, lb);  /* will remove 'i' from the list */

+    }

+    else

+      i++;

+  }

+  return needsclose;

+}

+

+

+/*

+** Create a new label with the given 'name' at the given 'line'.

+** 'last' tells whether label is the last non-op statement in its

+** block. Solves all pending goto's to this new label and adds

+** a close instruction if necessary.

+** Returns true iff it added a close instruction.

+*/

+static int createlabel (LexState *ls, TString *name, int line,

+                        int last) {

+  FuncState *fs = ls->fs;

+  Labellist *ll = &ls->dyd->label;

+  int l = newlabelentry(ls, ll, name, line, luaK_getlabel(fs));

+  if (last) {  /* label is last no-op statement in the block? */

+    /* assume that locals are already out of scope */

+    ll->arr[l].nactvar = fs->bl->nactvar;

+  }

+  if (solvegotos(ls, &ll->arr[l])) {  /* need close? */

+    luaK_codeABC(fs, OP_CLOSE, luaY_nvarstack(fs), 0, 0);

+    return 1;

+  }

+  return 0;

+}

+

+

+/*

+** Adjust pending gotos to outer level of a block.

+*/

+static void movegotosout (FuncState *fs, BlockCnt *bl) {

+  int i;

+  Labellist *gl = &fs->ls->dyd->gt;

+  /* correct pending gotos to current block */

+  for (i = bl->firstgoto; i < gl->n; i++) {  /* for each pending goto */

+    Labeldesc *gt = &gl->arr[i];

+    /* leaving a variable scope? */

+    if (stacklevel(fs, gt->nactvar) > stacklevel(fs, bl->nactvar))

+      gt->close |= bl->upval;  /* jump may need a close */

+    gt->nactvar = bl->nactvar;  /* update goto level */

+  }

+}

+

+

+static void enterblock (FuncState *fs, BlockCnt *bl, lu_byte isloop) {

+  bl->isloop = isloop;

+  bl->nactvar = fs->nactvar;

+  bl->firstlabel = fs->ls->dyd->label.n;

+  bl->firstgoto = fs->ls->dyd->gt.n;

+  bl->upval = 0;

+  bl->insidetbc = (fs->bl != NULL && fs->bl->insidetbc);

+  bl->previous = fs->bl;

+  fs->bl = bl;

+  lua_assert(fs->freereg == luaY_nvarstack(fs));

+}

+

+

+/*

+** generates an error for an undefined 'goto'.

+*/

+static l_noret undefgoto (LexState *ls, Labeldesc *gt) {

+  const char *msg;

+  if (eqstr(gt->name, luaS_newliteral(ls->L, "break"))) {

+    msg = "break outside loop at line %d";

+    msg = luaO_pushfstring(ls->L, msg, gt->line);

+  }

+  else {

+    msg = "no visible label '%s' for <goto> at line %d";

+    msg = luaO_pushfstring(ls->L, msg, getstr(gt->name), gt->line);

+  }

+  luaK_semerror(ls, msg);

+}

+

+

+static void leaveblock (FuncState *fs) {

+  BlockCnt *bl = fs->bl;

+  LexState *ls = fs->ls;

+  int hasclose = 0;

+  int stklevel = stacklevel(fs, bl->nactvar);  /* level outside the block */

+  if (bl->isloop)  /* fix pending breaks? */

+    hasclose = createlabel(ls, luaS_newliteral(ls->L, "break"), 0, 0);

+  if (!hasclose && bl->previous && bl->upval)

+    luaK_codeABC(fs, OP_CLOSE, stklevel, 0, 0);

+  fs->bl = bl->previous;

+  removevars(fs, bl->nactvar);

+  lua_assert(bl->nactvar == fs->nactvar);

+  fs->freereg = stklevel;  /* free registers */

+  ls->dyd->label.n = bl->firstlabel;  /* remove local labels */

+  if (bl->previous)  /* inner block? */

+    movegotosout(fs, bl);  /* update pending gotos to outer block */

+  else {

+    if (bl->firstgoto < ls->dyd->gt.n)  /* pending gotos in outer block? */

+      undefgoto(ls, &ls->dyd->gt.arr[bl->firstgoto]);  /* error */

+  }

+}

+

+

+/*

+** adds a new prototype into list of prototypes

+*/

+static Proto *addprototype (LexState *ls) {

+  Proto *clp;

+  lua_State *L = ls->L;

+  FuncState *fs = ls->fs;

+  Proto *f = fs->f;  /* prototype of current function */

+  if (fs->np >= f->sizep) {

+    int oldsize = f->sizep;

+    luaM_growvector(L, f->p, fs->np, f->sizep, Proto *, MAXARG_Bx, "functions");

+    while (oldsize < f->sizep)

+      f->p[oldsize++] = NULL;

+  }

+  f->p[fs->np++] = clp = luaF_newproto(L);

+  luaC_objbarrier(L, f, clp);

+  return clp;

+}

+

+

+/*

+** codes instruction to create new closure in parent function.

+** The OP_CLOSURE instruction uses the last available register,

+** so that, if it invokes the GC, the GC knows which registers

+** are in use at that time.

+

+*/

+static void codeclosure (LexState *ls, expdesc *v) {

+  FuncState *fs = ls->fs->prev;

+  init_exp(v, VRELOC, luaK_codeABx(fs, OP_CLOSURE, 0, fs->np - 1));

+  luaK_exp2nextreg(fs, v);  /* fix it at the last register */

+}

+

+

+static void open_func (LexState *ls, FuncState *fs, BlockCnt *bl) {

+  Proto *f = fs->f;

+  fs->prev = ls->fs;  /* linked list of funcstates */

+  fs->ls = ls;

+  ls->fs = fs;

+  fs->pc = 0;

+  fs->previousline = f->linedefined;

+  fs->iwthabs = 0;

+  fs->lasttarget = 0;

+  fs->freereg = 0;

+  fs->nk = 0;

+  fs->nabslineinfo = 0;

+  fs->np = 0;

+  fs->nups = 0;

+  fs->ndebugvars = 0;

+  fs->nactvar = 0;

+  fs->needclose = 0;

+  fs->firstlocal = ls->dyd->actvar.n;

+  fs->firstlabel = ls->dyd->label.n;

+  fs->bl = NULL;

+  f->source = ls->source;

+  luaC_objbarrier(ls->L, f, f->source);

+  f->maxstacksize = 2;  /* registers 0/1 are always valid */

+  enterblock(fs, bl, 0);

+}

+

+

+static void close_func (LexState *ls) {

+  lua_State *L = ls->L;

+  FuncState *fs = ls->fs;

+  Proto *f = fs->f;

+  luaK_ret(fs, luaY_nvarstack(fs), 0);  /* final return */

+  leaveblock(fs);

+  lua_assert(fs->bl == NULL);

+  luaK_finish(fs);

+  luaM_shrinkvector(L, f->code, f->sizecode, fs->pc, Instruction);

+  luaM_shrinkvector(L, f->lineinfo, f->sizelineinfo, fs->pc, ls_byte);

+  luaM_shrinkvector(L, f->abslineinfo, f->sizeabslineinfo,

+                       fs->nabslineinfo, AbsLineInfo);

+  luaM_shrinkvector(L, f->k, f->sizek, fs->nk, TValue);

+  luaM_shrinkvector(L, f->p, f->sizep, fs->np, Proto *);

+  luaM_shrinkvector(L, f->locvars, f->sizelocvars, fs->ndebugvars, LocVar);

+  luaM_shrinkvector(L, f->upvalues, f->sizeupvalues, fs->nups, Upvaldesc);

+  ls->fs = fs->prev;

+  luaC_checkGC(L);

+}

+

+

+

+/*============================================================*/

+/* GRAMMAR RULES */

+/*============================================================*/

+

+

+/*

+** check whether current token is in the follow set of a block.

+** 'until' closes syntactical blocks, but do not close scope,

+** so it is handled in separate.

+*/

+static int block_follow (LexState *ls, int withuntil) {

+  switch (ls->t.token) {

+    case TK_ELSE: case TK_ELSEIF:

+    case TK_END: case TK_EOS:

+      return 1;

+    case TK_UNTIL: return withuntil;

+    default: return 0;

+  }

+}

+

+

+static void statlist (LexState *ls) {

+  /* statlist -> { stat [';'] } */

+  while (!block_follow(ls, 1)) {

+    if (ls->t.token == TK_RETURN) {

+      statement(ls);

+      return;  /* 'return' must be last statement */

+    }

+    statement(ls);

+  }

+}

+

+

+static void fieldsel (LexState *ls, expdesc *v) {

+  /* fieldsel -> ['.' | ':'] NAME */

+  FuncState *fs = ls->fs;

+  expdesc key;

+  luaK_exp2anyregup(fs, v);

+  luaX_next(ls);  /* skip the dot or colon */

+  codename(ls, &key);

+  luaK_indexed(fs, v, &key);

+}

+

+

+static void yindex (LexState *ls, expdesc *v) {

+  /* index -> '[' expr ']' */

+  luaX_next(ls);  /* skip the '[' */

+  expr(ls, v);

+  luaK_exp2val(ls->fs, v);

+  checknext(ls, ']');

+}

+

+

+/*

+** {======================================================================

+** Rules for Constructors

+** =======================================================================

+*/

+

+

+typedef struct ConsControl {

+  expdesc v;  /* last list item read */

+  expdesc *t;  /* table descriptor */

+  int nh;  /* total number of 'record' elements */

+  int na;  /* number of array elements already stored */

+  int tostore;  /* number of array elements pending to be stored */

+} ConsControl;

+

+

+static void recfield (LexState *ls, ConsControl *cc) {

+  /* recfield -> (NAME | '['exp']') = exp */

+  FuncState *fs = ls->fs;

+  int reg = ls->fs->freereg;

+  expdesc tab, key, val;

+  if (ls->t.token == TK_NAME) {

+    checklimit(fs, cc->nh, MAX_INT, "items in a constructor");

+    codename(ls, &key);

+  }

+  else  /* ls->t.token == '[' */

+    yindex(ls, &key);

+  cc->nh++;

+  checknext(ls, '=');

+  tab = *cc->t;

+  luaK_indexed(fs, &tab, &key);

+  expr(ls, &val);

+  luaK_storevar(fs, &tab, &val);

+  fs->freereg = reg;  /* free registers */

+}

+

+

+static void closelistfield (FuncState *fs, ConsControl *cc) {

+  if (cc->v.k == VVOID) return;  /* there is no list item */

+  luaK_exp2nextreg(fs, &cc->v);

+  cc->v.k = VVOID;

+  if (cc->tostore == LFIELDS_PER_FLUSH) {

+    luaK_setlist(fs, cc->t->u.info, cc->na, cc->tostore);  /* flush */

+    cc->na += cc->tostore;

+    cc->tostore = 0;  /* no more items pending */

+  }

+}

+

+

+static void lastlistfield (FuncState *fs, ConsControl *cc) {

+  if (cc->tostore == 0) return;

+  if (hasmultret(cc->v.k)) {

+    luaK_setmultret(fs, &cc->v);

+    luaK_setlist(fs, cc->t->u.info, cc->na, LUA_MULTRET);

+    cc->na--;  /* do not count last expression (unknown number of elements) */

+  }

+  else {

+    if (cc->v.k != VVOID)

+      luaK_exp2nextreg(fs, &cc->v);

+    luaK_setlist(fs, cc->t->u.info, cc->na, cc->tostore);

+  }

+  cc->na += cc->tostore;

+}

+

+

+static void listfield (LexState *ls, ConsControl *cc) {

+  /* listfield -> exp */

+  expr(ls, &cc->v);

+  cc->tostore++;

+}

+

+

+static void field (LexState *ls, ConsControl *cc) {

+  /* field -> listfield | recfield */

+  switch(ls->t.token) {

+    case TK_NAME: {  /* may be 'listfield' or 'recfield' */

+      if (luaX_lookahead(ls) != '=')  /* expression? */

+        listfield(ls, cc);

+      else

+        recfield(ls, cc);

+      break;

+    }

+    case '[': {

+      recfield(ls, cc);

+      break;

+    }

+    default: {

+      listfield(ls, cc);

+      break;

+    }

+  }

+}

+

+

+static void constructor (LexState *ls, expdesc *t) {

+  /* constructor -> '{' [ field { sep field } [sep] ] '}'

+     sep -> ',' | ';' */

+  FuncState *fs = ls->fs;

+  int line = ls->linenumber;

+  int pc = luaK_codeABC(fs, OP_NEWTABLE, 0, 0, 0);

+  ConsControl cc;

+  luaK_code(fs, 0);  /* space for extra arg. */

+  cc.na = cc.nh = cc.tostore = 0;

+  cc.t = t;

+  init_exp(t, VNONRELOC, fs->freereg);  /* table will be at stack top */

+  luaK_reserveregs(fs, 1);

+  init_exp(&cc.v, VVOID, 0);  /* no value (yet) */

+  checknext(ls, '{');

+  do {

+    lua_assert(cc.v.k == VVOID || cc.tostore > 0);

+    if (ls->t.token == '}') break;

+    closelistfield(fs, &cc);

+    field(ls, &cc);

+  } while (testnext(ls, ',') || testnext(ls, ';'));

+  check_match(ls, '}', '{', line);

+  lastlistfield(fs, &cc);

+  luaK_settablesize(fs, pc, t->u.info, cc.na, cc.nh);

+}

+

+/* }====================================================================== */

+

+

+static void setvararg (FuncState *fs, int nparams) {

+  fs->f->is_vararg = 1;

+  luaK_codeABC(fs, OP_VARARGPREP, nparams, 0, 0);

+}

+

+

+static void parlist (LexState *ls) {

+  /* parlist -> [ {NAME ','} (NAME | '...') ] */

+  FuncState *fs = ls->fs;

+  Proto *f = fs->f;

+  int nparams = 0;

+  int isvararg = 0;

+  if (ls->t.token != ')') {  /* is 'parlist' not empty? */

+    do {

+      switch (ls->t.token) {

+        case TK_NAME: {

+          new_localvar(ls, str_checkname(ls));

+          nparams++;

+          break;

+        }

+        case TK_DOTS: {

+          luaX_next(ls);

+          isvararg = 1;

+          break;

+        }

+        default: luaX_syntaxerror(ls, "<name> or '...' expected");

+      }

+    } while (!isvararg && testnext(ls, ','));

+  }

+  adjustlocalvars(ls, nparams);

+  f->numparams = cast_byte(fs->nactvar);

+  if (isvararg)

+    setvararg(fs, f->numparams);  /* declared vararg */

+  luaK_reserveregs(fs, fs->nactvar);  /* reserve registers for parameters */

+}

+

+

+static void body (LexState *ls, expdesc *e, int ismethod, int line) {

+  /* body ->  '(' parlist ')' block END */

+  FuncState new_fs;

+  BlockCnt bl;

+  new_fs.f = addprototype(ls);

+  new_fs.f->linedefined = line;

+  open_func(ls, &new_fs, &bl);

+  checknext(ls, '(');

+  if (ismethod) {

+    new_localvarliteral(ls, "self");  /* create 'self' parameter */

+    adjustlocalvars(ls, 1);

+  }

+  parlist(ls);

+  checknext(ls, ')');

+  statlist(ls);

+  new_fs.f->lastlinedefined = ls->linenumber;

+  check_match(ls, TK_END, TK_FUNCTION, line);

+  codeclosure(ls, e);

+  close_func(ls);

+}

+

+

+static int explist (LexState *ls, expdesc *v) {

+  /* explist -> expr { ',' expr } */

+  int n = 1;  /* at least one expression */

+  expr(ls, v);

+  while (testnext(ls, ',')) {

+    luaK_exp2nextreg(ls->fs, v);

+    expr(ls, v);

+    n++;

+  }

+  return n;

+}

+

+

+static void funcargs (LexState *ls, expdesc *f, int line) {

+  FuncState *fs = ls->fs;

+  expdesc args;

+  int base, nparams;

+  switch (ls->t.token) {

+    case '(': {  /* funcargs -> '(' [ explist ] ')' */

+      luaX_next(ls);

+      if (ls->t.token == ')')  /* arg list is empty? */

+        args.k = VVOID;

+      else {

+        explist(ls, &args);

+        if (hasmultret(args.k))

+          luaK_setmultret(fs, &args);

+      }

+      check_match(ls, ')', '(', line);

+      break;

+    }

+    case '{': {  /* funcargs -> constructor */

+      constructor(ls, &args);

+      break;

+    }

+    case TK_STRING: {  /* funcargs -> STRING */

+      codestring(&args, ls->t.seminfo.ts);

+      luaX_next(ls);  /* must use 'seminfo' before 'next' */

+      break;

+    }

+    default: {

+      luaX_syntaxerror(ls, "function arguments expected");

+    }

+  }

+  lua_assert(f->k == VNONRELOC);

+  base = f->u.info;  /* base register for call */

+  if (hasmultret(args.k))

+    nparams = LUA_MULTRET;  /* open call */

+  else {

+    if (args.k != VVOID)

+      luaK_exp2nextreg(fs, &args);  /* close last argument */

+    nparams = fs->freereg - (base+1);

+  }

+  init_exp(f, VCALL, luaK_codeABC(fs, OP_CALL, base, nparams+1, 2));

+  luaK_fixline(fs, line);

+  fs->freereg = base+1;  /* call remove function and arguments and leaves

+                            (unless changed) one result */

+}

+

+

+

+

+/*

+** {======================================================================

+** Expression parsing

+** =======================================================================

+*/

+

+

+static void primaryexp (LexState *ls, expdesc *v) {

+  /* primaryexp -> NAME | '(' expr ')' */

+  switch (ls->t.token) {

+    case '(': {

+      int line = ls->linenumber;

+      luaX_next(ls);

+      expr(ls, v);

+      check_match(ls, ')', '(', line);

+      luaK_dischargevars(ls->fs, v);

+      return;

+    }

+    case TK_NAME: {

+      singlevar(ls, v);

+      return;

+    }

+    default: {

+      luaX_syntaxerror(ls, "unexpected symbol");

+    }

+  }

+}

+

+

+static void suffixedexp (LexState *ls, expdesc *v) {

+  /* suffixedexp ->

+       primaryexp { '.' NAME | '[' exp ']' | ':' NAME funcargs | funcargs } */

+  FuncState *fs = ls->fs;

+  int line = ls->linenumber;

+  primaryexp(ls, v);

+  for (;;) {

+    switch (ls->t.token) {

+      case '.': {  /* fieldsel */

+        fieldsel(ls, v);

+        break;

+      }

+      case '[': {  /* '[' exp ']' */

+        expdesc key;

+        luaK_exp2anyregup(fs, v);

+        yindex(ls, &key);

+        luaK_indexed(fs, v, &key);

+        break;

+      }

+      case ':': {  /* ':' NAME funcargs */

+        expdesc key;

+        luaX_next(ls);

+        codename(ls, &key);

+        luaK_self(fs, v, &key);

+        funcargs(ls, v, line);

+        break;

+      }

+      case '(': case TK_STRING: case '{': {  /* funcargs */

+        luaK_exp2nextreg(fs, v);

+        funcargs(ls, v, line);

+        break;

+      }

+      default: return;

+    }

+  }

+}

+

+

+static void simpleexp (LexState *ls, expdesc *v) {

+  /* simpleexp -> FLT | INT | STRING | NIL | TRUE | FALSE | ... |

+                  constructor | FUNCTION body | suffixedexp */

+  switch (ls->t.token) {

+    case TK_FLT: {

+      init_exp(v, VKFLT, 0);

+      v->u.nval = ls->t.seminfo.r;

+      break;

+    }

+    case TK_INT: {

+      init_exp(v, VKINT, 0);

+      v->u.ival = ls->t.seminfo.i;

+      break;

+    }

+    case TK_STRING: {

+      codestring(v, ls->t.seminfo.ts);

+      break;

+    }

+    case TK_NIL: {

+      init_exp(v, VNIL, 0);

+      break;

+    }

+    case TK_TRUE: {

+      init_exp(v, VTRUE, 0);

+      break;

+    }

+    case TK_FALSE: {

+      init_exp(v, VFALSE, 0);

+      break;

+    }

+    case TK_DOTS: {  /* vararg */

+      FuncState *fs = ls->fs;

+      check_condition(ls, fs->f->is_vararg,

+                      "cannot use '...' outside a vararg function");

+      init_exp(v, VVARARG, luaK_codeABC(fs, OP_VARARG, 0, 0, 1));

+      break;

+    }

+    case '{': {  /* constructor */

+      constructor(ls, v);

+      return;

+    }

+    case TK_FUNCTION: {

+      luaX_next(ls);

+      body(ls, v, 0, ls->linenumber);

+      return;

+    }

+    default: {

+      suffixedexp(ls, v);

+      return;

+    }

+  }

+  luaX_next(ls);

+}

+

+

+static UnOpr getunopr (int op) {

+  switch (op) {

+    case TK_NOT: return OPR_NOT;

+    case '-': return OPR_MINUS;

+    case '~': return OPR_BNOT;

+    case '#': return OPR_LEN;

+    default: return OPR_NOUNOPR;

+  }

+}

+

+

+static BinOpr getbinopr (int op) {

+  switch (op) {

+    case '+': return OPR_ADD;

+    case '-': return OPR_SUB;

+    case '*': return OPR_MUL;

+    case '%': return OPR_MOD;

+    case '^': return OPR_POW;

+    case '/': return OPR_DIV;

+    case TK_IDIV: return OPR_IDIV;

+    case '&': return OPR_BAND;

+    case '|': return OPR_BOR;

+    case '~': return OPR_BXOR;

+    case TK_SHL: return OPR_SHL;

+    case TK_SHR: return OPR_SHR;

+    case TK_CONCAT: return OPR_CONCAT;

+    case TK_NE: return OPR_NE;

+    case TK_EQ: return OPR_EQ;

+    case '<': return OPR_LT;

+    case TK_LE: return OPR_LE;

+    case '>': return OPR_GT;

+    case TK_GE: return OPR_GE;

+    case TK_AND: return OPR_AND;

+    case TK_OR: return OPR_OR;

+    default: return OPR_NOBINOPR;

+  }

+}

+

+

+/*

+** Priority table for binary operators.

+*/

+static const struct {

+  lu_byte left;  /* left priority for each binary operator */

+  lu_byte right; /* right priority */

+} priority[] = {  /* ORDER OPR */

+   {10, 10}, {10, 10},           /* '+' '-' */

+   {11, 11}, {11, 11},           /* '*' '%' */

+   {14, 13},                  /* '^' (right associative) */

+   {11, 11}, {11, 11},           /* '/' '//' */

+   {6, 6}, {4, 4}, {5, 5},   /* '&' '|' '~' */

+   {7, 7}, {7, 7},           /* '<<' '>>' */

+   {9, 8},                   /* '..' (right associative) */

+   {3, 3}, {3, 3}, {3, 3},   /* ==, <, <= */

+   {3, 3}, {3, 3}, {3, 3},   /* ~=, >, >= */

+   {2, 2}, {1, 1}            /* and, or */

+};

+

+#define UNARY_PRIORITY	12  /* priority for unary operators */

+

+

+/*

+** subexpr -> (simpleexp | unop subexpr) { binop subexpr }

+** where 'binop' is any binary operator with a priority higher than 'limit'

+*/

+static BinOpr subexpr (LexState *ls, expdesc *v, int limit) {

+  BinOpr op;

+  UnOpr uop;

+  enterlevel(ls);

+  uop = getunopr(ls->t.token);

+  if (uop != OPR_NOUNOPR) {  /* prefix (unary) operator? */

+    int line = ls->linenumber;

+    luaX_next(ls);  /* skip operator */

+    subexpr(ls, v, UNARY_PRIORITY);

+    luaK_prefix(ls->fs, uop, v, line);

+  }

+  else simpleexp(ls, v);

+  /* expand while operators have priorities higher than 'limit' */

+  op = getbinopr(ls->t.token);

+  while (op != OPR_NOBINOPR && priority[op].left > limit) {

+    expdesc v2;

+    BinOpr nextop;

+    int line = ls->linenumber;

+    luaX_next(ls);  /* skip operator */

+    luaK_infix(ls->fs, op, v);

+    /* read sub-expression with higher priority */

+    nextop = subexpr(ls, &v2, priority[op].right);

+    luaK_posfix(ls->fs, op, v, &v2, line);

+    op = nextop;

+  }

+  leavelevel(ls);

+  return op;  /* return first untreated operator */

+}

+

+

+static void expr (LexState *ls, expdesc *v) {

+  subexpr(ls, v, 0);

+}

+

+/* }==================================================================== */

+

+

+

+/*

+** {======================================================================

+** Rules for Statements

+** =======================================================================

+*/

+

+

+static void block (LexState *ls) {

+  /* block -> statlist */

+  FuncState *fs = ls->fs;

+  BlockCnt bl;

+  enterblock(fs, &bl, 0);

+  statlist(ls);

+  leaveblock(fs);

+}

+

+

+/*

+** structure to chain all variables in the left-hand side of an

+** assignment

+*/

+struct LHS_assign {

+  struct LHS_assign *prev;

+  expdesc v;  /* variable (global, local, upvalue, or indexed) */

+};

+

+

+/*

+** check whether, in an assignment to an upvalue/local variable, the

+** upvalue/local variable is begin used in a previous assignment to a

+** table. If so, save original upvalue/local value in a safe place and

+** use this safe copy in the previous assignment.

+*/

+static void check_conflict (LexState *ls, struct LHS_assign *lh, expdesc *v) {

+  FuncState *fs = ls->fs;

+  int extra = fs->freereg;  /* eventual position to save local variable */

+  int conflict = 0;

+  for (; lh; lh = lh->prev) {  /* check all previous assignments */

+    if (vkisindexed(lh->v.k)) {  /* assignment to table field? */

+      if (lh->v.k == VINDEXUP) {  /* is table an upvalue? */

+        if (v->k == VUPVAL && lh->v.u.ind.t == v->u.info) {

+          conflict = 1;  /* table is the upvalue being assigned now */

+          lh->v.k = VINDEXSTR;

+          lh->v.u.ind.t = extra;  /* assignment will use safe copy */

+        }

+      }

+      else {  /* table is a register */

+        if (v->k == VLOCAL && lh->v.u.ind.t == v->u.var.sidx) {

+          conflict = 1;  /* table is the local being assigned now */

+          lh->v.u.ind.t = extra;  /* assignment will use safe copy */

+        }

+        /* is index the local being assigned? */

+        if (lh->v.k == VINDEXED && v->k == VLOCAL &&

+            lh->v.u.ind.idx == v->u.var.sidx) {

+          conflict = 1;

+          lh->v.u.ind.idx = extra;  /* previous assignment will use safe copy */

+        }

+      }

+    }

+  }

+  if (conflict) {

+    /* copy upvalue/local value to a temporary (in position 'extra') */

+    if (v->k == VLOCAL)

+      luaK_codeABC(fs, OP_MOVE, extra, v->u.var.sidx, 0);

+    else

+      luaK_codeABC(fs, OP_GETUPVAL, extra, v->u.info, 0);

+    luaK_reserveregs(fs, 1);

+  }

+}

+

+/*

+** Parse and compile a multiple assignment. The first "variable"

+** (a 'suffixedexp') was already read by the caller.

+**

+** assignment -> suffixedexp restassign

+** restassign -> ',' suffixedexp restassign | '=' explist

+*/

+static void restassign (LexState *ls, struct LHS_assign *lh, int nvars) {

+  expdesc e;

+  check_condition(ls, vkisvar(lh->v.k), "syntax error");

+  check_readonly(ls, &lh->v);

+  if (testnext(ls, ',')) {  /* restassign -> ',' suffixedexp restassign */

+    struct LHS_assign nv;

+    nv.prev = lh;

+    suffixedexp(ls, &nv.v);

+    if (!vkisindexed(nv.v.k))

+      check_conflict(ls, lh, &nv.v);

+    enterlevel(ls);  /* control recursion depth */

+    restassign(ls, &nv, nvars+1);

+    leavelevel(ls);

+  }

+  else {  /* restassign -> '=' explist */

+    int nexps;

+    checknext(ls, '=');

+    nexps = explist(ls, &e);

+    if (nexps != nvars)

+      adjust_assign(ls, nvars, nexps, &e);

+    else {

+      luaK_setoneret(ls->fs, &e);  /* close last expression */

+      luaK_storevar(ls->fs, &lh->v, &e);

+      return;  /* avoid default */

+    }

+  }

+  init_exp(&e, VNONRELOC, ls->fs->freereg-1);  /* default assignment */

+  luaK_storevar(ls->fs, &lh->v, &e);

+}

+

+

+static int cond (LexState *ls) {

+  /* cond -> exp */

+  expdesc v;

+  expr(ls, &v);  /* read condition */

+  if (v.k == VNIL) v.k = VFALSE;  /* 'falses' are all equal here */

+  luaK_goiftrue(ls->fs, &v);

+  return v.f;

+}

+

+

+static void gotostat (LexState *ls) {

+  FuncState *fs = ls->fs;

+  int line = ls->linenumber;

+  TString *name = str_checkname(ls);  /* label's name */

+  Labeldesc *lb = findlabel(ls, name);

+  if (lb == NULL)  /* no label? */

+    /* forward jump; will be resolved when the label is declared */

+    newgotoentry(ls, name, line, luaK_jump(fs));

+  else {  /* found a label */

+    /* backward jump; will be resolved here */

+    int lblevel = stacklevel(fs, lb->nactvar);  /* label level */

+    if (luaY_nvarstack(fs) > lblevel)  /* leaving the scope of a variable? */

+      luaK_codeABC(fs, OP_CLOSE, lblevel, 0, 0);

+    /* create jump and link it to the label */

+    luaK_patchlist(fs, luaK_jump(fs), lb->pc);

+  }

+}

+

+

+/*

+** Break statement. Semantically equivalent to "goto break".

+*/

+static void breakstat (LexState *ls) {

+  int line = ls->linenumber;

+  luaX_next(ls);  /* skip break */

+  newgotoentry(ls, luaS_newliteral(ls->L, "break"), line, luaK_jump(ls->fs));

+}

+

+

+/*

+** Check whether there is already a label with the given 'name'.

+*/

+static void checkrepeated (LexState *ls, TString *name) {

+  Labeldesc *lb = findlabel(ls, name);

+  if (unlikely(lb != NULL)) {  /* already defined? */

+    const char *msg = "label '%s' already defined on line %d";

+    msg = luaO_pushfstring(ls->L, msg, getstr(name), lb->line);

+    luaK_semerror(ls, msg);  /* error */

+  }

+}

+

+

+static void labelstat (LexState *ls, TString *name, int line) {

+  /* label -> '::' NAME '::' */

+  checknext(ls, TK_DBCOLON);  /* skip double colon */

+  while (ls->t.token == ';' || ls->t.token == TK_DBCOLON)

+    statement(ls);  /* skip other no-op statements */

+  checkrepeated(ls, name);  /* check for repeated labels */

+  createlabel(ls, name, line, block_follow(ls, 0));

+}

+

+

+static void whilestat (LexState *ls, int line) {

+  /* whilestat -> WHILE cond DO block END */

+  FuncState *fs = ls->fs;

+  int whileinit;

+  int condexit;

+  BlockCnt bl;

+  luaX_next(ls);  /* skip WHILE */

+  whileinit = luaK_getlabel(fs);

+  condexit = cond(ls);

+  enterblock(fs, &bl, 1);

+  checknext(ls, TK_DO);

+  block(ls);

+  luaK_jumpto(fs, whileinit);

+  check_match(ls, TK_END, TK_WHILE, line);

+  leaveblock(fs);

+  luaK_patchtohere(fs, condexit);  /* false conditions finish the loop */

+}

+

+

+static void repeatstat (LexState *ls, int line) {

+  /* repeatstat -> REPEAT block UNTIL cond */

+  int condexit;

+  FuncState *fs = ls->fs;

+  int repeat_init = luaK_getlabel(fs);

+  BlockCnt bl1, bl2;

+  enterblock(fs, &bl1, 1);  /* loop block */

+  enterblock(fs, &bl2, 0);  /* scope block */

+  luaX_next(ls);  /* skip REPEAT */

+  statlist(ls);

+  check_match(ls, TK_UNTIL, TK_REPEAT, line);

+  condexit = cond(ls);  /* read condition (inside scope block) */

+  leaveblock(fs);  /* finish scope */

+  if (bl2.upval) {  /* upvalues? */

+    int exit = luaK_jump(fs);  /* normal exit must jump over fix */

+    luaK_patchtohere(fs, condexit);  /* repetition must close upvalues */

+    luaK_codeABC(fs, OP_CLOSE, stacklevel(fs, bl2.nactvar), 0, 0);

+    condexit = luaK_jump(fs);  /* repeat after closing upvalues */

+    luaK_patchtohere(fs, exit);  /* normal exit comes to here */

+  }

+  luaK_patchlist(fs, condexit, repeat_init);  /* close the loop */

+  leaveblock(fs);  /* finish loop */

+}

+

+

+/*

+** Read an expression and generate code to put its results in next

+** stack slot.

+**

+*/

+static void exp1 (LexState *ls) {

+  expdesc e;

+  expr(ls, &e);

+  luaK_exp2nextreg(ls->fs, &e);

+  lua_assert(e.k == VNONRELOC);

+}

+

+

+/*

+** Fix for instruction at position 'pc' to jump to 'dest'.

+** (Jump addresses are relative in Lua). 'back' true means

+** a back jump.

+*/

+static void fixforjump (FuncState *fs, int pc, int dest, int back) {

+  Instruction *jmp = &fs->f->code[pc];

+  int offset = dest - (pc + 1);

+  if (back)

+    offset = -offset;

+  if (unlikely(offset > MAXARG_Bx))

+    luaX_syntaxerror(fs->ls, "control structure too long");

+  SETARG_Bx(*jmp, offset);

+}

+

+

+/*

+** Generate code for a 'for' loop.

+*/

+static void forbody (LexState *ls, int base, int line, int nvars, int isgen) {

+  /* forbody -> DO block */

+  static const OpCode forprep[2] = {OP_FORPREP, OP_TFORPREP};

+  static const OpCode forloop[2] = {OP_FORLOOP, OP_TFORLOOP};

+  BlockCnt bl;

+  FuncState *fs = ls->fs;

+  int prep, endfor;

+  checknext(ls, TK_DO);

+  prep = luaK_codeABx(fs, forprep[isgen], base, 0);

+  enterblock(fs, &bl, 0);  /* scope for declared variables */

+  adjustlocalvars(ls, nvars);

+  luaK_reserveregs(fs, nvars);

+  block(ls);

+  leaveblock(fs);  /* end of scope for declared variables */

+  fixforjump(fs, prep, luaK_getlabel(fs), 0);

+  if (isgen) {  /* generic for? */

+    luaK_codeABC(fs, OP_TFORCALL, base, 0, nvars);

+    luaK_fixline(fs, line);

+  }

+  endfor = luaK_codeABx(fs, forloop[isgen], base, 0);

+  fixforjump(fs, endfor, prep + 1, 1);

+  luaK_fixline(fs, line);

+}

+

+

+static void fornum (LexState *ls, TString *varname, int line) {

+  /* fornum -> NAME = exp,exp[,exp] forbody */

+  FuncState *fs = ls->fs;

+  int base = fs->freereg;

+  new_localvarliteral(ls, "(for state)");

+  new_localvarliteral(ls, "(for state)");

+  new_localvarliteral(ls, "(for state)");

+  new_localvar(ls, varname);

+  checknext(ls, '=');

+  exp1(ls);  /* initial value */

+  checknext(ls, ',');

+  exp1(ls);  /* limit */

+  if (testnext(ls, ','))

+    exp1(ls);  /* optional step */

+  else {  /* default step = 1 */

+    luaK_int(fs, fs->freereg, 1);

+    luaK_reserveregs(fs, 1);

+  }

+  adjustlocalvars(ls, 3);  /* control variables */

+  forbody(ls, base, line, 1, 0);

+}

+

+

+static void forlist (LexState *ls, TString *indexname) {

+  /* forlist -> NAME {,NAME} IN explist forbody */

+  FuncState *fs = ls->fs;

+  expdesc e;

+  int nvars = 5;  /* gen, state, control, toclose, 'indexname' */

+  int line;

+  int base = fs->freereg;

+  /* create control variables */

+  new_localvarliteral(ls, "(for state)");

+  new_localvarliteral(ls, "(for state)");

+  new_localvarliteral(ls, "(for state)");

+  new_localvarliteral(ls, "(for state)");

+  /* create declared variables */

+  new_localvar(ls, indexname);

+  while (testnext(ls, ',')) {

+    new_localvar(ls, str_checkname(ls));

+    nvars++;

+  }

+  checknext(ls, TK_IN);

+  line = ls->linenumber;

+  adjust_assign(ls, 4, explist(ls, &e), &e);

+  adjustlocalvars(ls, 4);  /* control variables */

+  markupval(fs, fs->nactvar);  /* last control var. must be closed */

+  luaK_checkstack(fs, 3);  /* extra space to call generator */

+  forbody(ls, base, line, nvars - 4, 1);

+}

+

+

+static void forstat (LexState *ls, int line) {

+  /* forstat -> FOR (fornum | forlist) END */

+  FuncState *fs = ls->fs;

+  TString *varname;

+  BlockCnt bl;

+  enterblock(fs, &bl, 1);  /* scope for loop and control variables */

+  luaX_next(ls);  /* skip 'for' */

+  varname = str_checkname(ls);  /* first variable name */

+  switch (ls->t.token) {

+    case '=': fornum(ls, varname, line); break;

+    case ',': case TK_IN: forlist(ls, varname); break;

+    default: luaX_syntaxerror(ls, "'=' or 'in' expected");

+  }

+  check_match(ls, TK_END, TK_FOR, line);

+  leaveblock(fs);  /* loop scope ('break' jumps to this point) */

+}

+

+

+static void test_then_block (LexState *ls, int *escapelist) {

+  /* test_then_block -> [IF | ELSEIF] cond THEN block */

+  BlockCnt bl;

+  FuncState *fs = ls->fs;

+  expdesc v;

+  int jf;  /* instruction to skip 'then' code (if condition is false) */

+  luaX_next(ls);  /* skip IF or ELSEIF */

+  expr(ls, &v);  /* read condition */

+  checknext(ls, TK_THEN);

+  if (ls->t.token == TK_BREAK) {  /* 'if x then break' ? */

+    int line = ls->linenumber;

+    luaK_goiffalse(ls->fs, &v);  /* will jump if condition is true */

+    luaX_next(ls);  /* skip 'break' */

+    enterblock(fs, &bl, 0);  /* must enter block before 'goto' */

+    newgotoentry(ls, luaS_newliteral(ls->L, "break"), line, v.t);

+    while (testnext(ls, ';')) {}  /* skip semicolons */

+    if (block_follow(ls, 0)) {  /* jump is the entire block? */

+      leaveblock(fs);

+      return;  /* and that is it */

+    }

+    else  /* must skip over 'then' part if condition is false */

+      jf = luaK_jump(fs);

+  }

+  else {  /* regular case (not a break) */

+    luaK_goiftrue(ls->fs, &v);  /* skip over block if condition is false */

+    enterblock(fs, &bl, 0);

+    jf = v.f;

+  }

+  statlist(ls);  /* 'then' part */

+  leaveblock(fs);

+  if (ls->t.token == TK_ELSE ||

+      ls->t.token == TK_ELSEIF)  /* followed by 'else'/'elseif'? */

+    luaK_concat(fs, escapelist, luaK_jump(fs));  /* must jump over it */

+  luaK_patchtohere(fs, jf);

+}

+

+

+static void ifstat (LexState *ls, int line) {

+  /* ifstat -> IF cond THEN block {ELSEIF cond THEN block} [ELSE block] END */

+  FuncState *fs = ls->fs;

+  int escapelist = NO_JUMP;  /* exit list for finished parts */

+  test_then_block(ls, &escapelist);  /* IF cond THEN block */

+  while (ls->t.token == TK_ELSEIF)

+    test_then_block(ls, &escapelist);  /* ELSEIF cond THEN block */

+  if (testnext(ls, TK_ELSE))

+    block(ls);  /* 'else' part */

+  check_match(ls, TK_END, TK_IF, line);

+  luaK_patchtohere(fs, escapelist);  /* patch escape list to 'if' end */

+}

+

+

+static void localfunc (LexState *ls) {

+  expdesc b;

+  FuncState *fs = ls->fs;

+  int fvar = fs->nactvar;  /* function's variable index */

+  new_localvar(ls, str_checkname(ls));  /* new local variable */

+  adjustlocalvars(ls, 1);  /* enter its scope */

+  body(ls, &b, 0, ls->linenumber);  /* function created in next register */

+  /* debug information will only see the variable after this point! */

+  localdebuginfo(fs, fvar)->startpc = fs->pc;

+}

+

+

+static int getlocalattribute (LexState *ls) {

+  /* ATTRIB -> ['<' Name '>'] */

+  if (testnext(ls, '<')) {

+    const char *attr = getstr(str_checkname(ls));

+    checknext(ls, '>');

+    if (strcmp(attr, "const") == 0)

+      return RDKCONST;  /* read-only variable */

+    else if (strcmp(attr, "close") == 0)

+      return RDKTOCLOSE;  /* to-be-closed variable */

+    else

+      luaK_semerror(ls,

+        luaO_pushfstring(ls->L, "unknown attribute '%s'", attr));

+  }

+  return VDKREG;  /* regular variable */

+}

+

+

+static void checktoclose (LexState *ls, int level) {

+  if (level != -1) {  /* is there a to-be-closed variable? */

+    FuncState *fs = ls->fs;

+    markupval(fs, level + 1);

+    fs->bl->insidetbc = 1;  /* in the scope of a to-be-closed variable */

+    luaK_codeABC(fs, OP_TBC, stacklevel(fs, level), 0, 0);

+  }

+}

+

+

+static void localstat (LexState *ls) {

+  /* stat -> LOCAL NAME ATTRIB { ',' NAME ATTRIB } ['=' explist] */

+  FuncState *fs = ls->fs;

+  int toclose = -1;  /* index of to-be-closed variable (if any) */

+  Vardesc *var;  /* last variable */

+  int vidx, kind;  /* index and kind of last variable */

+  int nvars = 0;

+  int nexps;

+  expdesc e;

+  do {

+    vidx = new_localvar(ls, str_checkname(ls));

+    kind = getlocalattribute(ls);

+    getlocalvardesc(fs, vidx)->vd.kind = kind;

+    if (kind == RDKTOCLOSE) {  /* to-be-closed? */

+      if (toclose != -1)  /* one already present? */

+        luaK_semerror(ls, "multiple to-be-closed variables in local list");

+      toclose = fs->nactvar + nvars;

+    }

+    nvars++;

+  } while (testnext(ls, ','));

+  if (testnext(ls, '='))

+    nexps = explist(ls, &e);

+  else {

+    e.k = VVOID;

+    nexps = 0;

+  }

+  var = getlocalvardesc(fs, vidx);  /* get last variable */

+  if (nvars == nexps &&  /* no adjustments? */

+      var->vd.kind == RDKCONST &&  /* last variable is const? */

+      luaK_exp2const(fs, &e, &var->k)) {  /* compile-time constant? */

+    var->vd.kind = RDKCTC;  /* variable is a compile-time constant */

+    adjustlocalvars(ls, nvars - 1);  /* exclude last variable */

+    fs->nactvar++;  /* but count it */

+  }

+  else {

+    adjust_assign(ls, nvars, nexps, &e);

+    adjustlocalvars(ls, nvars);

+  }

+  checktoclose(ls, toclose);

+}

+

+

+static int funcname (LexState *ls, expdesc *v) {

+  /* funcname -> NAME {fieldsel} [':' NAME] */

+  int ismethod = 0;

+  singlevar(ls, v);

+  while (ls->t.token == '.')

+    fieldsel(ls, v);

+  if (ls->t.token == ':') {

+    ismethod = 1;

+    fieldsel(ls, v);

+  }

+  return ismethod;

+}

+

+

+static void funcstat (LexState *ls, int line) {

+  /* funcstat -> FUNCTION funcname body */

+  int ismethod;

+  expdesc v, b;

+  luaX_next(ls);  /* skip FUNCTION */

+  ismethod = funcname(ls, &v);

+  body(ls, &b, ismethod, line);

+  luaK_storevar(ls->fs, &v, &b);

+  luaK_fixline(ls->fs, line);  /* definition "happens" in the first line */

+}

+

+

+static void exprstat (LexState *ls) {

+  /* stat -> func | assignment */

+  FuncState *fs = ls->fs;

+  struct LHS_assign v;

+  suffixedexp(ls, &v.v);

+  if (ls->t.token == '=' || ls->t.token == ',') { /* stat -> assignment ? */

+    v.prev = NULL;

+    restassign(ls, &v, 1);

+  }

+  else {  /* stat -> func */

+    Instruction *inst;

+    check_condition(ls, v.v.k == VCALL, "syntax error");

+    inst = &getinstruction(fs, &v.v);

+    SETARG_C(*inst, 1);  /* call statement uses no results */

+  }

+}

+

+

+static void retstat (LexState *ls) {

+  /* stat -> RETURN [explist] [';'] */

+  FuncState *fs = ls->fs;

+  expdesc e;

+  int nret;  /* number of values being returned */

+  int first = luaY_nvarstack(fs);  /* first slot to be returned */

+  if (block_follow(ls, 1) || ls->t.token == ';')

+    nret = 0;  /* return no values */

+  else {

+    nret = explist(ls, &e);  /* optional return values */

+    if (hasmultret(e.k)) {

+      luaK_setmultret(fs, &e);

+      if (e.k == VCALL && nret == 1 && !fs->bl->insidetbc) {  /* tail call? */

+        SET_OPCODE(getinstruction(fs,&e), OP_TAILCALL);

+        lua_assert(GETARG_A(getinstruction(fs,&e)) == luaY_nvarstack(fs));

+      }

+      nret = LUA_MULTRET;  /* return all values */

+    }

+    else {

+      if (nret == 1)  /* only one single value? */

+        first = luaK_exp2anyreg(fs, &e);  /* can use original slot */

+      else {  /* values must go to the top of the stack */

+        luaK_exp2nextreg(fs, &e);

+        lua_assert(nret == fs->freereg - first);

+      }

+    }

+  }

+  luaK_ret(fs, first, nret);

+  testnext(ls, ';');  /* skip optional semicolon */

+}

+

+

+static void statement (LexState *ls) {

+  int line = ls->linenumber;  /* may be needed for error messages */

+  enterlevel(ls);

+  switch (ls->t.token) {

+    case ';': {  /* stat -> ';' (empty statement) */

+      luaX_next(ls);  /* skip ';' */

+      break;

+    }

+    case TK_IF: {  /* stat -> ifstat */

+      ifstat(ls, line);

+      break;

+    }

+    case TK_WHILE: {  /* stat -> whilestat */

+      whilestat(ls, line);

+      break;

+    }

+    case TK_DO: {  /* stat -> DO block END */

+      luaX_next(ls);  /* skip DO */

+      block(ls);

+      check_match(ls, TK_END, TK_DO, line);

+      break;

+    }

+    case TK_FOR: {  /* stat -> forstat */

+      forstat(ls, line);

+      break;

+    }

+    case TK_REPEAT: {  /* stat -> repeatstat */

+      repeatstat(ls, line);

+      break;

+    }

+    case TK_FUNCTION: {  /* stat -> funcstat */

+      funcstat(ls, line);

+      break;

+    }

+    case TK_LOCAL: {  /* stat -> localstat */

+      luaX_next(ls);  /* skip LOCAL */

+      if (testnext(ls, TK_FUNCTION))  /* local function? */

+        localfunc(ls);

+      else

+        localstat(ls);

+      break;

+    }

+    case TK_DBCOLON: {  /* stat -> label */

+      luaX_next(ls);  /* skip double colon */

+      labelstat(ls, str_checkname(ls), line);

+      break;

+    }

+    case TK_RETURN: {  /* stat -> retstat */

+      luaX_next(ls);  /* skip RETURN */

+      retstat(ls);

+      break;

+    }

+    case TK_BREAK: {  /* stat -> breakstat */

+      breakstat(ls);

+      break;

+    }

+    case TK_GOTO: {  /* stat -> 'goto' NAME */

+      luaX_next(ls);  /* skip 'goto' */

+      gotostat(ls);

+      break;

+    }

+    default: {  /* stat -> func | assignment */

+      exprstat(ls);

+      break;

+    }

+  }

+  lua_assert(ls->fs->f->maxstacksize >= ls->fs->freereg &&

+             ls->fs->freereg >= luaY_nvarstack(ls->fs));

+  ls->fs->freereg = luaY_nvarstack(ls->fs);  /* free registers */

+  leavelevel(ls);

+}

+

+/* }====================================================================== */

+

+

+/*

+** compiles the main function, which is a regular vararg function with an

+** upvalue named LUA_ENV

+*/

+static void mainfunc (LexState *ls, FuncState *fs) {

+  BlockCnt bl;

+  Upvaldesc *env;

+  open_func(ls, fs, &bl);

+  setvararg(fs, 0);  /* main function is always declared vararg */

+  env = allocupvalue(fs);  /* ...set environment upvalue */

+  env->instack = 1;

+  env->idx = 0;

+  env->kind = VDKREG;

+  env->name = ls->envn;

+  luaC_objbarrier(ls->L, fs->f, env->name);

+  luaX_next(ls);  /* read first token */

+  statlist(ls);  /* parse main body */

+  check(ls, TK_EOS);

+  close_func(ls);

+}

+

+

+LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,

+                       Dyndata *dyd, const char *name, int firstchar) {

+  LexState lexstate;

+  FuncState funcstate;

+  LClosure *cl = luaF_newLclosure(L, 1);  /* create main closure */

+  setclLvalue2s(L, L->top, cl);  /* anchor it (to avoid being collected) */

+  luaD_inctop(L);

+  lexstate.h = luaH_new(L);  /* create table for scanner */

+  sethvalue2s(L, L->top, lexstate.h);  /* anchor it */

+  luaD_inctop(L);

+  funcstate.f = cl->p = luaF_newproto(L);

+  luaC_objbarrier(L, cl, cl->p);

+  funcstate.f->source = luaS_new(L, name);  /* create and anchor TString */

+  luaC_objbarrier(L, funcstate.f, funcstate.f->source);

+  lexstate.buff = buff;

+  lexstate.dyd = dyd;

+  dyd->actvar.n = dyd->gt.n = dyd->label.n = 0;

+  luaX_setinput(L, &lexstate, z, funcstate.f->source, firstchar);

+  mainfunc(&lexstate, &funcstate);

+  lua_assert(!funcstate.prev && funcstate.nups == 1 && !lexstate.fs);

+  /* all scopes should be correctly finished */

+  lua_assert(dyd->actvar.n == 0 && dyd->gt.n == 0 && dyd->label.n == 0);

+  L->top--;  /* remove scanner's table */

+  return cl;  /* closure is on the stack, too */

+}

+

--- /dev/null

+++ b/lparser.h

@@ -1,0 +1,171 @@

+/*

+** $Id: lparser.h $

+** Lua Parser

+** See Copyright Notice in lua.h

+*/

+

+#ifndef lparser_h

+#define lparser_h

+

+#include "llimits.h"

+#include "lobject.h"

+#include "lzio.h"

+

+

+/*

+** Expression and variable descriptor.

+** Code generation for variables and expressions can be delayed to allow

+** optimizations; An 'expdesc' structure describes a potentially-delayed

+** variable/expression. It has a description of its "main" value plus a

+** list of conditional jumps that can also produce its value (generated

+** by short-circuit operators 'and'/'or').

+*/

+

+/* kinds of variables/expressions */

+typedef enum {

+  VVOID,  /* when 'expdesc' describes the last expression of a list,

+             this kind means an empty list (so, no expression) */

+  VNIL,  /* constant nil */

+  VTRUE,  /* constant true */

+  VFALSE,  /* constant false */

+  VK,  /* constant in 'k'; info = index of constant in 'k' */

+  VKFLT,  /* floating constant; nval = numerical float value */

+  VKINT,  /* integer constant; ival = numerical integer value */

+  VKSTR,  /* string constant; strval = TString address;

+             (string is fixed by the lexer) */

+  VNONRELOC,  /* expression has its value in a fixed register;

+                 info = result register */

+  VLOCAL,  /* local variable; var.sidx = stack index (local register);

+              var.vidx = relative index in 'actvar.arr'  */

+  VUPVAL,  /* upvalue variable; info = index of upvalue in 'upvalues' */

+  VCONST,  /* compile-time <const> variable;

+              info = absolute index in 'actvar.arr'  */

+  VINDEXED,  /* indexed variable;

+                ind.t = table register;

+                ind.idx = key's R index */

+  VINDEXUP,  /* indexed upvalue;

+                ind.t = table upvalue;

+                ind.idx = key's K index */

+  VINDEXI, /* indexed variable with constant integer;

+                ind.t = table register;

+                ind.idx = key's value */

+  VINDEXSTR, /* indexed variable with literal string;

+                ind.t = table register;

+                ind.idx = key's K index */

+  VJMP,  /* expression is a test/comparison;

+            info = pc of corresponding jump instruction */

+  VRELOC,  /* expression can put result in any register;

+              info = instruction pc */

+  VCALL,  /* expression is a function call; info = instruction pc */

+  VVARARG  /* vararg expression; info = instruction pc */

+} expkind;

+

+

+#define vkisvar(k)	(VLOCAL <= (k) && (k) <= VINDEXSTR)

+#define vkisindexed(k)	(VINDEXED <= (k) && (k) <= VINDEXSTR)

+

+

+typedef struct expdesc {

+  expkind k;

+  union {

+    lua_Integer ival;    /* for VKINT */

+    lua_Number nval;  /* for VKFLT */

+    TString *strval;  /* for VKSTR */

+    int info;  /* for generic use */

+    struct {  /* for indexed variables */

+      short idx;  /* index (R or "long" K) */

+      lu_byte t;  /* table (register or upvalue) */

+    } ind;

+    struct {  /* for local variables */

+      lu_byte sidx;  /* index in the stack */

+      unsigned short vidx;  /* compiler index (in 'actvar.arr')  */

+    } var;

+  } u;

+  int t;  /* patch list of 'exit when true' */

+  int f;  /* patch list of 'exit when false' */

+} expdesc;

+

+

+/* kinds of variables */

+#define VDKREG		0   /* regular */

+#define RDKCONST	1   /* constant */

+#define RDKTOCLOSE	2   /* to-be-closed */

+#define RDKCTC		3   /* compile-time constant */

+

+/* description of an active local variable */

+typedef union Vardesc {

+  struct {

+    TValuefields;  /* constant value (if it is a compile-time constant) */

+    lu_byte kind;

+    lu_byte sidx;  /* index of the variable in the stack */

+    short pidx;  /* index of the variable in the Proto's 'locvars' array */

+    TString *name;  /* variable name */

+  } vd;

+  TValue k;  /* constant value (if any) */

+} Vardesc;

+

+

+

+/* description of pending goto statements and label statements */

+typedef struct Labeldesc {

+  TString *name;  /* label identifier */

+  int pc;  /* position in code */

+  int line;  /* line where it appeared */

+  lu_byte nactvar;  /* number of active variables in that position */

+  lu_byte close;  /* goto that escapes upvalues */

+} Labeldesc;

+

+

+/* list of labels or gotos */

+typedef struct Labellist {

+  Labeldesc *arr;  /* array */

+  int n;  /* number of entries in use */

+  int size;  /* array size */

+} Labellist;

+

+

+/* dynamic structures used by the parser */

+typedef struct Dyndata {

+  struct {  /* list of all active local variables */

+    Vardesc *arr;

+    int n;

+    int size;

+  } actvar;

+  Labellist gt;  /* list of pending gotos */

+  Labellist label;   /* list of active labels */

+} Dyndata;

+

+

+/* control of blocks */

+struct BlockCnt;  /* defined in lparser.c */

+

+

+/* state needed to generate code for a given function */

+typedef struct FuncState {

+  Proto *f;  /* current function header */

+  struct FuncState *prev;  /* enclosing function */

+  struct LexState *ls;  /* lexical state */

+  struct BlockCnt *bl;  /* chain of current blocks */

+  int pc;  /* next position to code (equivalent to 'ncode') */

+  int lasttarget;   /* 'label' of last 'jump label' */

+  int previousline;  /* last line that was saved in 'lineinfo' */

+  int nk;  /* number of elements in 'k' */

+  int np;  /* number of elements in 'p' */

+  int nabslineinfo;  /* number of elements in 'abslineinfo' */

+  int firstlocal;  /* index of first local var (in Dyndata array) */

+  int firstlabel;  /* index of first label (in 'dyd->label->arr') */

+  short ndebugvars;  /* number of elements in 'f->locvars' */

+  lu_byte nactvar;  /* number of active local variables */

+  lu_byte nups;  /* number of upvalues */

+  lu_byte freereg;  /* first free register */

+  lu_byte iwthabs;  /* instructions issued since last absolute line info */

+  lu_byte needclose;  /* function needs to close upvalues when returning */

+} FuncState;

+

+

+LUAI_FUNC int luaY_nvarstack (FuncState *fs);

+LUAI_FUNC LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,

+                                 Dyndata *dyd, const char *name, int firstchar);

+

+

+#endif

--- /dev/null

+++ b/lprefix.h

@@ -1,0 +1,45 @@

+/*

+** $Id: lprefix.h $

+** Definitions for Lua code that must come before any other header file

+** See Copyright Notice in lua.h

+*/

+

+#ifndef lprefix_h

+#define lprefix_h

+

+

+/*

+** Allows POSIX/XSI stuff

+*/

+#if !defined(LUA_USE_C89)	/* { */

+

+#if !defined(_XOPEN_SOURCE)

+#define _XOPEN_SOURCE           600

+#elif _XOPEN_SOURCE == 0

+#undef _XOPEN_SOURCE  /* use -D_XOPEN_SOURCE=0 to undefine it */

+#endif

+

+/*

+** Allows manipulation of large files in gcc and some other compilers

+*/

+#if !defined(LUA_32BITS) && !defined(_FILE_OFFSET_BITS)

+#define _LARGEFILE_SOURCE       1

+#define _FILE_OFFSET_BITS       64

+#endif

+

+#endif				/* } */

+

+

+/*

+** Windows stuff

+*/

+#if defined(_WIN32)	/* { */

+

+#if !defined(_CRT_SECURE_NO_WARNINGS)

+#define _CRT_SECURE_NO_WARNINGS  /* avoid warnings about ISO C functions */

+#endif

+

+#endif			/* } */

+

+#endif

+

--- /dev/null

+++ b/lstate.c

@@ -1,0 +1,434 @@

+/*

+** $Id: lstate.c $

+** Global State

+** See Copyright Notice in lua.h

+*/

+

+#define lstate_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <stddef.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "lapi.h"

+#include "ldebug.h"

+#include "ldo.h"

+#include "lfunc.h"

+#include "lgc.h"

+#include "llex.h"

+#include "lmem.h"

+#include "lstate.h"

+#include "lstring.h"

+#include "ltable.h"

+#include "ltm.h"

+

+

+

+/*

+** thread state + extra space

+*/

+typedef struct LX {

+  lu_byte extra_[LUA_EXTRASPACE];

+  lua_State l;

+} LX;

+

+

+/*

+** Main thread combines a thread state and the global state

+*/

+typedef struct LG {

+  LX l;

+  global_State g;

+} LG;

+

+

+

+#define fromstate(L)	(cast(LX *, cast(lu_byte *, (L)) - offsetof(LX, l)))

+

+

+/*

+** A macro to create a "random" seed when a state is created;

+** the seed is used to randomize string hashes.

+*/

+#if !defined(luai_makeseed)

+

+#include <time.h>

+

+/*

+** Compute an initial seed with some level of randomness.

+** Rely on Address Space Layout Randomization (if present) and

+** current time.

+*/

+#define addbuff(b,p,e) \

+  { size_t t = cast_sizet(e); \

+    memcpy(b + p, &t, sizeof(t)); p += sizeof(t); }

+

+static unsigned int luai_makeseed (lua_State *L) {

+  char buff[3 * sizeof(size_t)];

+  unsigned int h = cast_uint(time(NULL));

+  int p = 0;

+  addbuff(buff, p, L);  /* heap variable */

+  addbuff(buff, p, &h);  /* local variable */

+  addbuff(buff, p, &lua_newstate);  /* public function */

+  lua_assert(p == sizeof(buff));

+  return luaS_hash(buff, p, h);

+}

+

+#endif

+

+

+/*

+** set GCdebt to a new value keeping the value (totalbytes + GCdebt)

+** invariant (and avoiding underflows in 'totalbytes')

+*/

+void luaE_setdebt (global_State *g, l_mem debt) {

+  l_mem tb = gettotalbytes(g);

+  lua_assert(tb > 0);

+  if (debt < tb - MAX_LMEM)

+    debt = tb - MAX_LMEM;  /* will make 'totalbytes == MAX_LMEM' */

+  g->totalbytes = tb - debt;

+  g->GCdebt = debt;

+}

+

+

+LUA_API int lua_setcstacklimit (lua_State *L, unsigned int limit) {

+  UNUSED(L); UNUSED(limit);

+  return LUAI_MAXCCALLS;  /* warning?? */

+}

+

+

+CallInfo *luaE_extendCI (lua_State *L) {

+  CallInfo *ci;

+  lua_assert(L->ci->next == NULL);

+  ci = luaM_new(L, CallInfo);

+  lua_assert(L->ci->next == NULL);

+  L->ci->next = ci;

+  ci->previous = L->ci;

+  ci->next = NULL;

+  ci->u.l.trap = 0;

+  L->nci++;

+  return ci;

+}

+

+

+/*

+** free all CallInfo structures not in use by a thread

+*/

+void luaE_freeCI (lua_State *L) {

+  CallInfo *ci = L->ci;

+  CallInfo *next = ci->next;

+  ci->next = NULL;

+  while ((ci = next) != NULL) {

+    next = ci->next;

+    luaM_free(L, ci);

+    L->nci--;

+  }

+}

+

+

+/*

+** free half of the CallInfo structures not in use by a thread,

+** keeping the first one.

+*/

+void luaE_shrinkCI (lua_State *L) {

+  CallInfo *ci = L->ci->next;  /* first free CallInfo */

+  CallInfo *next;

+  if (ci == NULL)

+    return;  /* no extra elements */

+  while ((next = ci->next) != NULL) {  /* two extra elements? */

+    CallInfo *next2 = next->next;  /* next's next */

+    ci->next = next2;  /* remove next from the list */

+    L->nci--;

+    luaM_free(L, next);  /* free next */

+    if (next2 == NULL)

+      break;  /* no more elements */

+    else {

+      next2->previous = ci;

+      ci = next2;  /* continue */

+    }

+  }

+}

+

+

+/*

+** Called when 'getCcalls(L)' larger or equal to LUAI_MAXCCALLS.

+** If equal, raises an overflow error. If value is larger than

+** LUAI_MAXCCALLS (which means it is handling an overflow) but

+** not much larger, does not report an error (to allow overflow

+** handling to work).

+*/

+void luaE_checkcstack (lua_State *L) {

+  if (getCcalls(L) == LUAI_MAXCCALLS)

+    luaG_runerror(L, "C stack overflow");

+  else if (getCcalls(L) >= (LUAI_MAXCCALLS / 10 * 11))

+    luaD_throw(L, LUA_ERRERR);  /* error while handing stack error */

+}

+

+

+LUAI_FUNC void luaE_incCstack (lua_State *L) {

+  L->nCcalls++;

+  if (unlikely(getCcalls(L) >= LUAI_MAXCCALLS))

+    luaE_checkcstack(L);

+}

+

+

+static void stack_init (lua_State *L1, lua_State *L) {

+  int i; CallInfo *ci;

+  /* initialize stack array */

+  L1->stack = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, StackValue);

+  for (i = 0; i < BASIC_STACK_SIZE + EXTRA_STACK; i++)

+    setnilvalue(s2v(L1->stack + i));  /* erase new stack */

+  L1->top = L1->stack;

+  L1->stack_last = L1->stack + BASIC_STACK_SIZE;

+  /* initialize first ci */

+  ci = &L1->base_ci;

+  ci->next = ci->previous = NULL;

+  ci->callstatus = CIST_C;

+  ci->func = L1->top;

+  ci->u.c.k = NULL;

+  ci->nresults = 0;

+  setnilvalue(s2v(L1->top));  /* 'function' entry for this 'ci' */

+  L1->top++;

+  ci->top = L1->top + LUA_MINSTACK;

+  L1->ci = ci;

+}

+

+

+static void freestack (lua_State *L) {

+  if (L->stack == NULL)

+    return;  /* stack not completely built yet */

+  L->ci = &L->base_ci;  /* free the entire 'ci' list */

+  luaE_freeCI(L);

+  lua_assert(L->nci == 0);

+  luaM_freearray(L, L->stack, stacksize(L) + EXTRA_STACK);  /* free stack */

+}

+

+

+/*

+** Create registry table and its predefined values

+*/

+static void init_registry (lua_State *L, global_State *g) {

+  TValue temp;

+  /* create registry */

+  Table *registry = luaH_new(L);

+  sethvalue(L, &g->l_registry, registry);

+  luaH_resize(L, registry, LUA_RIDX_LAST, 0);

+  /* registry[LUA_RIDX_MAINTHREAD] = L */

+  setthvalue(L, &temp, L);  /* temp = L */

+  luaH_setint(L, registry, LUA_RIDX_MAINTHREAD, &temp);

+  /* registry[LUA_RIDX_GLOBALS] = table of globals */

+  sethvalue(L, &temp, luaH_new(L));  /* temp = new table (global table) */

+  luaH_setint(L, registry, LUA_RIDX_GLOBALS, &temp);

+}

+

+

+/*

+** open parts of the state that may cause memory-allocation errors.

+** ('g->nilvalue' being a nil value flags that the state was completely

+** build.)

+*/

+static void f_luaopen (lua_State *L, void *ud) {

+  global_State *g = G(L);

+  UNUSED(ud);

+  stack_init(L, L);  /* init stack */

+  init_registry(L, g);

+  luaS_init(L);

+  luaT_init(L);

+  luaX_init(L);

+  g->gcrunning = 1;  /* allow gc */

+  setnilvalue(&g->nilvalue);

+  luai_userstateopen(L);

+}

+

+

+/*

+** preinitialize a thread with consistent values without allocating

+** any memory (to avoid errors)

+*/

+static void preinit_thread (lua_State *L, global_State *g) {

+  G(L) = g;

+  L->stack = NULL;

+  L->ci = NULL;

+  L->nci = 0;

+  L->twups = L;  /* thread has no upvalues */

+  L->errorJmp = NULL;

+  L->hook = NULL;

+  L->hookmask = 0;

+  L->basehookcount = 0;

+  L->allowhook = 1;

+  resethookcount(L);

+  L->openupval = NULL;

+  L->status = LUA_OK;

+  L->errfunc = 0;

+  L->oldpc = 0;

+}

+

+

+static void close_state (lua_State *L) {

+  global_State *g = G(L);

+  luaF_close(L, L->stack, CLOSEPROTECT);  /* close all upvalues */

+  luaC_freeallobjects(L);  /* collect all objects */

+  if (ttisnil(&g->nilvalue))  /* closing a fully built state? */

+    luai_userstateclose(L);

+  luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size);

+  freestack(L);

+  lua_assert(gettotalbytes(g) == sizeof(LG));

+  (*g->frealloc)(g->ud, fromstate(L), sizeof(LG), 0);  /* free main block */

+}

+

+

+LUA_API lua_State *lua_newthread (lua_State *L) {

+  global_State *g;

+  lua_State *L1;

+  lua_lock(L);

+  g = G(L);

+  luaC_checkGC(L);

+  /* create new thread */

+  L1 = &cast(LX *, luaM_newobject(L, LUA_TTHREAD, sizeof(LX)))->l;

+  L1->marked = luaC_white(g);

+  L1->tt = LUA_VTHREAD;

+  /* link it on list 'allgc' */

+  L1->next = g->allgc;

+  g->allgc = obj2gco(L1);

+  /* anchor it on L stack */

+  setthvalue2s(L, L->top, L1);

+  api_incr_top(L);

+  preinit_thread(L1, g);

+  L1->nCcalls = 0;

+  L1->hookmask = L->hookmask;

+  L1->basehookcount = L->basehookcount;

+  L1->hook = L->hook;

+  resethookcount(L1);

+  /* initialize L1 extra space */

+  memcpy(lua_getextraspace(L1), lua_getextraspace(g->mainthread),

+         LUA_EXTRASPACE);

+  luai_userstatethread(L, L1);

+  stack_init(L1, L);  /* init stack */

+  lua_unlock(L);

+  return L1;

+}

+

+

+void luaE_freethread (lua_State *L, lua_State *L1) {

+  LX *l = fromstate(L1);

+  luaF_close(L1, L1->stack, NOCLOSINGMETH);  /* close all upvalues */

+  lua_assert(L1->openupval == NULL);

+  luai_userstatefree(L, L1);

+  freestack(L1);

+  luaM_free(L, l);

+}

+

+

+int lua_resetthread (lua_State *L) {

+  CallInfo *ci;

+  int status;

+  lua_lock(L);

+  L->ci = ci = &L->base_ci;  /* unwind CallInfo list */

+  setnilvalue(s2v(L->stack));  /* 'function' entry for basic 'ci' */

+  ci->func = L->stack;

+  ci->callstatus = CIST_C;

+  status = luaF_close(L, L->stack, CLOSEPROTECT);

+  if (status != CLOSEPROTECT)  /* real errors? */

+    luaD_seterrorobj(L, status, L->stack + 1);

+  else {

+    status = LUA_OK;

+    L->top = L->stack + 1;

+  }

+  ci->top = L->top + LUA_MINSTACK;

+  L->status = status;

+  lua_unlock(L);

+  return status;

+}

+

+

+LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {

+  int i;

+  lua_State *L;

+  global_State *g;

+  LG *l = cast(LG *, (*f)(ud, NULL, LUA_TTHREAD, sizeof(LG)));

+  if (l == NULL) return NULL;

+  L = &l->l.l;

+  g = &l->g;

+  L->tt = LUA_VTHREAD;

+  g->currentwhite = bitmask(WHITE0BIT);

+  L->marked = luaC_white(g);

+  preinit_thread(L, g);

+  g->allgc = obj2gco(L);  /* by now, only object is the main thread */

+  L->next = NULL;

+  L->nCcalls = 0;

+  incnny(L);  /* main thread is always non yieldable */

+  g->frealloc = f;

+  g->ud = ud;

+  g->warnf = NULL;

+  g->ud_warn = NULL;

+  g->mainthread = L;

+  g->seed = luai_makeseed(L);

+  g->gcrunning = 0;  /* no GC while building state */

+  g->strt.size = g->strt.nuse = 0;

+  g->strt.hash = NULL;

+  setnilvalue(&g->l_registry);

+  g->panic = NULL;

+  g->gcstate = GCSpause;

+  g->gckind = KGC_INC;

+  g->gcemergency = 0;

+  g->finobj = g->tobefnz = g->fixedgc = NULL;

+  g->firstold1 = g->survival = g->old1 = g->reallyold = NULL;

+  g->finobjsur = g->finobjold1 = g->finobjrold = NULL;

+  g->sweepgc = NULL;

+  g->gray = g->grayagain = NULL;

+  g->weak = g->ephemeron = g->allweak = NULL;

+  g->twups = NULL;

+  g->totalbytes = sizeof(LG);

+  g->GCdebt = 0;

+  g->lastatomic = 0;

+  setivalue(&g->nilvalue, 0);  /* to signal that state is not yet built */

+  setgcparam(g->gcpause, LUAI_GCPAUSE);

+  setgcparam(g->gcstepmul, LUAI_GCMUL);

+  g->gcstepsize = LUAI_GCSTEPSIZE;

+  setgcparam(g->genmajormul, LUAI_GENMAJORMUL);

+  g->genminormul = LUAI_GENMINORMUL;

+  for (i=0; i < LUA_NUMTAGS; i++) g->mt[i] = NULL;

+  if (luaD_rawrunprotected(L, f_luaopen, NULL) != LUA_OK) {

+    /* memory allocation error: free partial state */

+    close_state(L);

+    L = NULL;

+  }

+  return L;

+}

+

+

+LUA_API void lua_close (lua_State *L) {

+  lua_lock(L);

+  L = G(L)->mainthread;  /* only the main thread can be closed */

+  close_state(L);

+}

+

+

+void luaE_warning (lua_State *L, const char *msg, int tocont) {

+  lua_WarnFunction wf = G(L)->warnf;

+  if (wf != NULL)

+    wf(G(L)->ud_warn, msg, tocont);

+}

+

+

+/*

+** Generate a warning from an error message

+*/

+void luaE_warnerror (lua_State *L, const char *where) {

+  TValue *errobj = s2v(L->top - 1);  /* error object */

+  const char *msg = (ttisstring(errobj))

+                  ? svalue(errobj)

+                  : "error object is not a string";

+  /* produce warning "error in %s (%s)" (where, msg) */

+  luaE_warning(L, "error in ", 1);

+  luaE_warning(L, where, 1);

+  luaE_warning(L, " (", 1);

+  luaE_warning(L, msg, 1);

+  luaE_warning(L, ")", 0);

+}

+

--- /dev/null

+++ b/lstate.h

@@ -1,0 +1,365 @@

+/*

+** $Id: lstate.h $

+** Global State

+** See Copyright Notice in lua.h

+*/

+

+#ifndef lstate_h

+#define lstate_h

+

+#include "lua.h"

+

+#include "lobject.h"

+#include "ltm.h"

+#include "lzio.h"

+

+

+/*

+** Some notes about garbage-collected objects: All objects in Lua must

+** be kept somehow accessible until being freed, so all objects always

+** belong to one (and only one) of these lists, using field 'next' of

+** the 'CommonHeader' for the link:

+**

+** 'allgc': all objects not marked for finalization;

+** 'finobj': all objects marked for finalization;

+** 'tobefnz': all objects ready to be finalized;

+** 'fixedgc': all objects that are not to be collected (currently

+** only small strings, such as reserved words).

+**

+** For the generational collector, some of these lists have marks for

+** generations. Each mark points to the first element in the list for

+** that particular generation; that generation goes until the next mark.

+**

+** 'allgc' -> 'survival': new objects;

+** 'survival' -> 'old': objects that survived one collection;

+** 'old1' -> 'reallyold': objects that became old in last collection;

+** 'reallyold' -> NULL: objects old for more than one cycle.

+**

+** 'finobj' -> 'finobjsur': new objects marked for finalization;

+** 'finobjsur' -> 'finobjold1': survived   """";

+** 'finobjold1' -> 'finobjrold': just old  """";

+** 'finobjrold' -> NULL: really old       """".

+**

+** All lists can contain elements older than their main ages, due

+** to 'luaC_checkfinalizer' and 'udata2finalize', which move

+** objects between the normal lists and the "marked for finalization"

+** lists. Moreover, barriers can age young objects in young lists as

+** OLD0, which then become OLD1. However, a list never contains

+** elements younger than their main ages.

+**

+** The generational collector also uses a pointer 'firstold1', which

+** points to the first OLD1 object in the list. It is used to optimize

+** 'markold'. (Potentially OLD1 objects can be anywhere between 'allgc'

+** and 'reallyold', but often the list has no OLD1 objects or they are

+** after 'old1'.) Note the difference between it and 'old1':

+** 'firstold1': no OLD1 objects before this point; there can be all

+**   ages after it.

+** 'old1': no objects younger than OLD1 after this point.

+*/

+

+/*

+** Moreover, there is another set of lists that control gray objects.

+** These lists are linked by fields 'gclist'. (All objects that

+** can become gray have such a field. The field is not the same

+** in all objects, but it always has this name.)  Any gray object

+** must belong to one of these lists, and all objects in these lists

+** must be gray (with two exceptions explained below):

+**

+** 'gray': regular gray objects, still waiting to be visited.

+** 'grayagain': objects that must be revisited at the atomic phase.

+**   That includes

+**   - black objects got in a write barrier;

+**   - all kinds of weak tables during propagation phase;

+**   - all threads.

+** 'weak': tables with weak values to be cleared;

+** 'ephemeron': ephemeron tables with white->white entries;

+** 'allweak': tables with weak keys and/or weak values to be cleared.

+**

+** The exceptions to that "gray rule" are:

+** - TOUCHED2 objects in generational mode stay in a gray list (because

+** they must be visited again at the end of the cycle), but they are

+** marked black because assignments to them must activate barriers (to

+** move them back to TOUCHED1).

+** - Open upvales are kept gray to avoid barriers, but they stay out

+** of gray lists. (They don't even have a 'gclist' field.)

+*/

+

+

+

+/*

+** About 'nCcalls':  This count has two parts: the lower 16 bits counts

+** the number of recursive invocations in the C stack; the higher

+** 16 bits counts the number of non-yieldable calls in the stack.

+** (They are together so that we can change and save both with one

+** instruction.)

+*/

+

+

+/* true if this thread does not have non-yieldable calls in the stack */

+#define yieldable(L)		(((L)->nCcalls & 0xffff0000) == 0)

+

+/* real number of C calls */

+#define getCcalls(L)	((L)->nCcalls & 0xffff)

+

+

+/* Increment the number of non-yieldable calls */

+#define incnny(L)	((L)->nCcalls += 0x10000)

+

+/* Decrement the number of non-yieldable calls */

+#define decnny(L)	((L)->nCcalls -= 0x10000)

+

+/* Non-yieldable call increment */

+#define nyci	(0x10000 | 1)

+

+

+

+

+struct lua_longjmp;  /* defined in ldo.c */

+

+

+/*

+** Atomic type (relative to signals) to better ensure that 'lua_sethook'

+** is thread safe

+*/

+#if !defined(l_signalT)

+#include <signal.h>

+#define l_signalT	sig_atomic_t

+#endif

+

+

+/*

+** Extra stack space to handle TM calls and some other extras. This

+** space is not included in 'stack_last'. It is used only to avoid stack

+** checks, either because the element will be promptly popped or because

+** there will be a stack check soon after the push. Function frames

+** never use this extra space, so it does not need to be kept clean.

+*/

+#define EXTRA_STACK   5

+

+

+#define BASIC_STACK_SIZE        (2*LUA_MINSTACK)

+

+#define stacksize(th)	cast_int((th)->stack_last - (th)->stack)

+

+

+/* kinds of Garbage Collection */

+#define KGC_INC		0	/* incremental gc */

+#define KGC_GEN		1	/* generational gc */

+

+

+typedef struct stringtable {

+  TString **hash;

+  int nuse;  /* number of elements */

+  int size;

+} stringtable;

+

+

+/*

+** Information about a call.

+*/

+typedef struct CallInfo {

+  StkId func;  /* function index in the stack */

+  StkId	top;  /* top for this function */

+  struct CallInfo *previous, *next;  /* dynamic call link */

+  union {

+    struct {  /* only for Lua functions */

+      const Instruction *savedpc;

+      volatile l_signalT trap;

+      int nextraargs;  /* # of extra arguments in vararg functions */

+    } l;

+    struct {  /* only for C functions */

+      lua_KFunction k;  /* continuation in case of yields */

+      ptrdiff_t old_errfunc;

+      lua_KContext ctx;  /* context info. in case of yields */

+    } c;

+  } u;

+  union {

+    int funcidx;  /* called-function index */

+    int nyield;  /* number of values yielded */

+    struct {  /* info about transferred values (for call/return hooks) */

+      unsigned short ftransfer;  /* offset of first value transferred */

+      unsigned short ntransfer;  /* number of values transferred */

+    } transferinfo;

+  } u2;

+  short nresults;  /* expected number of results from this function */

+  unsigned short callstatus;

+} CallInfo;

+

+

+/*

+** Bits in CallInfo status

+*/

+#define CIST_OAH	(1<<0)	/* original value of 'allowhook' */

+#define CIST_C		(1<<1)	/* call is running a C function */

+#define CIST_FRESH	(1<<2)  /* call is on a fresh "luaV_execute" frame */

+#define CIST_HOOKED	(1<<3)	/* call is running a debug hook */

+#define CIST_YPCALL	(1<<4)	/* call is a yieldable protected call */

+#define CIST_TAIL	(1<<5)	/* call was tail called */

+#define CIST_HOOKYIELD	(1<<6)	/* last hook called yielded */

+#define CIST_FIN	(1<<7)  /* call is running a finalizer */

+#define CIST_TRAN	(1<<8)	/* 'ci' has transfer information */

+#if defined(LUA_COMPAT_LT_LE)

+#define CIST_LEQ	(1<<9)  /* using __lt for __le */

+#endif

+

+/* active function is a Lua function */

+#define isLua(ci)	(!((ci)->callstatus & CIST_C))

+

+/* call is running Lua code (not a hook) */

+#define isLuacode(ci)	(!((ci)->callstatus & (CIST_C | CIST_HOOKED)))

+

+/* assume that CIST_OAH has offset 0 and that 'v' is strictly 0/1 */

+#define setoah(st,v)	((st) = ((st) & ~CIST_OAH) | (v))

+#define getoah(st)	((st) & CIST_OAH)

+

+

+/*

+** 'global state', shared by all threads of this state

+*/

+typedef struct global_State {

+  lua_Alloc frealloc;  /* function to reallocate memory */

+  void *ud;         /* auxiliary data to 'frealloc' */

+  l_mem totalbytes;  /* number of bytes currently allocated - GCdebt */

+  l_mem GCdebt;  /* bytes allocated not yet compensated by the collector */

+  lu_mem GCestimate;  /* an estimate of the non-garbage memory in use */

+  lu_mem lastatomic;  /* see function 'genstep' in file 'lgc.c' */

+  stringtable strt;  /* hash table for strings */

+  TValue l_registry;

+  TValue nilvalue;  /* a nil value */

+  unsigned int seed;  /* randomized seed for hashes */

+  lu_byte currentwhite;

+  lu_byte gcstate;  /* state of garbage collector */

+  lu_byte gckind;  /* kind of GC running */

+  lu_byte genminormul;  /* control for minor generational collections */

+  lu_byte genmajormul;  /* control for major generational collections */

+  lu_byte gcrunning;  /* true if GC is running */

+  lu_byte gcemergency;  /* true if this is an emergency collection */

+  lu_byte gcpause;  /* size of pause between successive GCs */

+  lu_byte gcstepmul;  /* GC "speed" */

+  lu_byte gcstepsize;  /* (log2 of) GC granularity */

+  GCObject *allgc;  /* list of all collectable objects */

+  GCObject **sweepgc;  /* current position of sweep in list */

+  GCObject *finobj;  /* list of collectable objects with finalizers */

+  GCObject *gray;  /* list of gray objects */

+  GCObject *grayagain;  /* list of objects to be traversed atomically */

+  GCObject *weak;  /* list of tables with weak values */

+  GCObject *ephemeron;  /* list of ephemeron tables (weak keys) */

+  GCObject *allweak;  /* list of all-weak tables */

+  GCObject *tobefnz;  /* list of userdata to be GC */

+  GCObject *fixedgc;  /* list of objects not to be collected */

+  /* fields for generational collector */

+  GCObject *survival;  /* start of objects that survived one GC cycle */

+  GCObject *old1;  /* start of old1 objects */

+  GCObject *reallyold;  /* objects more than one cycle old ("really old") */

+  GCObject *firstold1;  /* first OLD1 object in the list (if any) */

+  GCObject *finobjsur;  /* list of survival objects with finalizers */

+  GCObject *finobjold1;  /* list of old1 objects with finalizers */

+  GCObject *finobjrold;  /* list of really old objects with finalizers */

+  struct lua_State *twups;  /* list of threads with open upvalues */

+  lua_CFunction panic;  /* to be called in unprotected errors */

+  struct lua_State *mainthread;

+  TString *memerrmsg;  /* message for memory-allocation errors */

+  TString *tmname[TM_N];  /* array with tag-method names */

+  struct Table *mt[LUA_NUMTAGS];  /* metatables for basic types */

+  TString *strcache[STRCACHE_N][STRCACHE_M];  /* cache for strings in API */

+  lua_WarnFunction warnf;  /* warning function */

+  void *ud_warn;         /* auxiliary data to 'warnf' */

+} global_State;

+

+

+/*

+** 'per thread' state

+*/

+struct lua_State {

+  CommonHeader;

+  lu_byte status;

+  lu_byte allowhook;

+  unsigned short nci;  /* number of items in 'ci' list */

+  StkId top;  /* first free slot in the stack */

+  global_State *l_G;

+  CallInfo *ci;  /* call info for current function */

+  StkId stack_last;  /* end of stack (last element + 1) */

+  StkId stack;  /* stack base */

+  UpVal *openupval;  /* list of open upvalues in this stack */

+  GCObject *gclist;

+  struct lua_State *twups;  /* list of threads with open upvalues */

+  struct lua_longjmp *errorJmp;  /* current error recover point */

+  CallInfo base_ci;  /* CallInfo for first level (C calling Lua) */

+  volatile lua_Hook hook;

+  ptrdiff_t errfunc;  /* current error handling function (stack index) */

+  l_uint32 nCcalls;  /* number of nested (non-yieldable | C)  calls */

+  int oldpc;  /* last pc traced */

+  int basehookcount;

+  int hookcount;

+  volatile l_signalT hookmask;

+};

+

+

+#define G(L)	(L->l_G)

+

+

+/*

+** Union of all collectable objects (only for conversions)

+** ISO C99, 6.5.2.3 p.5:

+** "if a union contains several structures that share a common initial

+** sequence [...], and if the union object currently contains one

+** of these structures, it is permitted to inspect the common initial

+** part of any of them anywhere that a declaration of the complete type

+** of the union is visible."

+*/

+union GCUnion {

+  GCObject gc;  /* common header */

+  struct TString ts;

+  struct Udata u;

+  union Closure cl;

+  struct Table h;

+  struct Proto p;

+  struct lua_State th;  /* thread */

+  struct UpVal upv;

+};

+

+

+/*

+** ISO C99, 6.7.2.1 p.14:

+** "A pointer to a union object, suitably converted, points to each of

+** its members [...], and vice versa."

+*/

+#define cast_u(o)	cast(union GCUnion *, (o))

+

+/* macros to convert a GCObject into a specific value */

+#define gco2ts(o)  \

+	check_exp(novariant((o)->tt) == LUA_TSTRING, &((cast_u(o))->ts))

+#define gco2u(o)  check_exp((o)->tt == LUA_VUSERDATA, &((cast_u(o))->u))

+#define gco2lcl(o)  check_exp((o)->tt == LUA_VLCL, &((cast_u(o))->cl.l))

+#define gco2ccl(o)  check_exp((o)->tt == LUA_VCCL, &((cast_u(o))->cl.c))

+#define gco2cl(o)  \

+	check_exp(novariant((o)->tt) == LUA_TFUNCTION, &((cast_u(o))->cl))

+#define gco2t(o)  check_exp((o)->tt == LUA_VTABLE, &((cast_u(o))->h))

+#define gco2p(o)  check_exp((o)->tt == LUA_VPROTO, &((cast_u(o))->p))

+#define gco2th(o)  check_exp((o)->tt == LUA_VTHREAD, &((cast_u(o))->th))

+#define gco2upv(o)	check_exp((o)->tt == LUA_VUPVAL, &((cast_u(o))->upv))

+

+

+/*

+** macro to convert a Lua object into a GCObject

+** (The access to 'tt' tries to ensure that 'v' is actually a Lua object.)

+*/

+#define obj2gco(v)	check_exp((v)->tt >= LUA_TSTRING, &(cast_u(v)->gc))

+

+

+/* actual number of total bytes allocated */

+#define gettotalbytes(g)	cast(lu_mem, (g)->totalbytes + (g)->GCdebt)

+

+LUAI_FUNC void luaE_setdebt (global_State *g, l_mem debt);

+LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);

+LUAI_FUNC CallInfo *luaE_extendCI (lua_State *L);

+LUAI_FUNC void luaE_freeCI (lua_State *L);

+LUAI_FUNC void luaE_shrinkCI (lua_State *L);

+LUAI_FUNC void luaE_checkcstack (lua_State *L);

+LUAI_FUNC void luaE_incCstack (lua_State *L);

+LUAI_FUNC void luaE_warning (lua_State *L, const char *msg, int tocont);

+LUAI_FUNC void luaE_warnerror (lua_State *L, const char *where);

+

+

+#endif

+

--- /dev/null

+++ b/lstring.c

@@ -1,0 +1,273 @@

+/*

+** $Id: lstring.c $

+** String table (keeps all strings handled by Lua)

+** See Copyright Notice in lua.h

+*/

+

+#define lstring_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <string.h>

+

+#include "lua.h"

+

+#include "ldebug.h"

+#include "ldo.h"

+#include "lmem.h"

+#include "lobject.h"

+#include "lstate.h"

+#include "lstring.h"

+

+

+/*

+** Maximum size for string table.

+*/

+#define MAXSTRTB	cast_int(luaM_limitN(MAX_INT, TString*))

+

+

+/*

+** equality for long strings

+*/

+int luaS_eqlngstr (TString *a, TString *b) {

+  size_t len = a->u.lnglen;

+  lua_assert(a->tt == LUA_VLNGSTR && b->tt == LUA_VLNGSTR);

+  return (a == b) ||  /* same instance or... */

+    ((len == b->u.lnglen) &&  /* equal length and ... */

+     (memcmp(getstr(a), getstr(b), len) == 0));  /* equal contents */

+}

+

+

+unsigned int luaS_hash (const char *str, size_t l, unsigned int seed) {

+  unsigned int h = seed ^ cast_uint(l);

+  for (; l > 0; l--)

+    h ^= ((h<<5) + (h>>2) + cast_byte(str[l - 1]));

+  return h;

+}

+

+

+unsigned int luaS_hashlongstr (TString *ts) {

+  lua_assert(ts->tt == LUA_VLNGSTR);

+  if (ts->extra == 0) {  /* no hash? */

+    size_t len = ts->u.lnglen;

+    ts->hash = luaS_hash(getstr(ts), len, ts->hash);

+    ts->extra = 1;  /* now it has its hash */

+  }

+  return ts->hash;

+}

+

+

+static void tablerehash (TString **vect, int osize, int nsize) {

+  int i;

+  for (i = osize; i < nsize; i++)  /* clear new elements */

+    vect[i] = NULL;

+  for (i = 0; i < osize; i++) {  /* rehash old part of the array */

+    TString *p = vect[i];

+    vect[i] = NULL;

+    while (p) {  /* for each string in the list */

+      TString *hnext = p->u.hnext;  /* save next */

+      unsigned int h = lmod(p->hash, nsize);  /* new position */

+      p->u.hnext = vect[h];  /* chain it into array */

+      vect[h] = p;

+      p = hnext;

+    }

+  }

+}

+

+

+/*

+** Resize the string table. If allocation fails, keep the current size.

+** (This can degrade performance, but any non-zero size should work

+** correctly.)

+*/

+void luaS_resize (lua_State *L, int nsize) {

+  stringtable *tb = &G(L)->strt;

+  int osize = tb->size;

+  TString **newvect;

+  if (nsize < osize)  /* shrinking table? */

+    tablerehash(tb->hash, osize, nsize);  /* depopulate shrinking part */

+  newvect = luaM_reallocvector(L, tb->hash, osize, nsize, TString*);

+  if (unlikely(newvect == NULL)) {  /* reallocation failed? */

+    if (nsize < osize)  /* was it shrinking table? */

+      tablerehash(tb->hash, nsize, osize);  /* restore to original size */

+    /* leave table as it was */

+  }

+  else {  /* allocation succeeded */

+    tb->hash = newvect;

+    tb->size = nsize;

+    if (nsize > osize)

+      tablerehash(newvect, osize, nsize);  /* rehash for new size */

+  }

+}

+

+

+/*

+** Clear API string cache. (Entries cannot be empty, so fill them with

+** a non-collectable string.)

+*/

+void luaS_clearcache (global_State *g) {

+  int i, j;

+  for (i = 0; i < STRCACHE_N; i++)

+    for (j = 0; j < STRCACHE_M; j++) {

+      if (iswhite(g->strcache[i][j]))  /* will entry be collected? */

+        g->strcache[i][j] = g->memerrmsg;  /* replace it with something fixed */

+    }

+}

+

+

+/*

+** Initialize the string table and the string cache

+*/

+void luaS_init (lua_State *L) {

+  global_State *g = G(L);

+  int i, j;

+  stringtable *tb = &G(L)->strt;

+  tb->hash = luaM_newvector(L, MINSTRTABSIZE, TString*);

+  tablerehash(tb->hash, 0, MINSTRTABSIZE);  /* clear array */

+  tb->size = MINSTRTABSIZE;

+  /* pre-create memory-error message */

+  g->memerrmsg = luaS_newliteral(L, MEMERRMSG);

+  luaC_fix(L, obj2gco(g->memerrmsg));  /* it should never be collected */

+  for (i = 0; i < STRCACHE_N; i++)  /* fill cache with valid strings */

+    for (j = 0; j < STRCACHE_M; j++)

+      g->strcache[i][j] = g->memerrmsg;

+}

+

+

+

+/*

+** creates a new string object

+*/

+static TString *createstrobj (lua_State *L, size_t l, int tag, unsigned int h) {

+  TString *ts;

+  GCObject *o;

+  size_t totalsize;  /* total size of TString object */

+  totalsize = sizelstring(l);

+  o = luaC_newobj(L, tag, totalsize);

+  ts = gco2ts(o);

+  ts->hash = h;

+  ts->extra = 0;

+  getstr(ts)[l] = '\0';  /* ending 0 */

+  return ts;

+}

+

+

+TString *luaS_createlngstrobj (lua_State *L, size_t l) {

+  TString *ts = createstrobj(L, l, LUA_VLNGSTR, G(L)->seed);

+  ts->u.lnglen = l;

+  return ts;

+}

+

+

+void luaS_remove (lua_State *L, TString *ts) {

+  stringtable *tb = &G(L)->strt;

+  TString **p = &tb->hash[lmod(ts->hash, tb->size)];

+  while (*p != ts)  /* find previous element */

+    p = &(*p)->u.hnext;

+  *p = (*p)->u.hnext;  /* remove element from its list */

+  tb->nuse--;

+}

+

+

+static void growstrtab (lua_State *L, stringtable *tb) {

+  if (unlikely(tb->nuse == MAX_INT)) {  /* too many strings? */

+    luaC_fullgc(L, 1);  /* try to free some... */

+    if (tb->nuse == MAX_INT)  /* still too many? */

+      luaM_error(L);  /* cannot even create a message... */

+  }

+  if (tb->size <= MAXSTRTB / 2)  /* can grow string table? */

+    luaS_resize(L, tb->size * 2);

+}

+

+

+/*

+** Checks whether short string exists and reuses it or creates a new one.

+*/

+static TString *internshrstr (lua_State *L, const char *str, size_t l) {

+  TString *ts;

+  global_State *g = G(L);

+  stringtable *tb = &g->strt;

+  unsigned int h = luaS_hash(str, l, g->seed);

+  TString **list = &tb->hash[lmod(h, tb->size)];

+  lua_assert(str != NULL);  /* otherwise 'memcmp'/'memcpy' are undefined */

+  for (ts = *list; ts != NULL; ts = ts->u.hnext) {

+    if (l == ts->shrlen && (memcmp(str, getstr(ts), l * sizeof(char)) == 0)) {

+      /* found! */

+      if (isdead(g, ts))  /* dead (but not collected yet)? */

+        changewhite(ts);  /* resurrect it */

+      return ts;

+    }

+  }

+  /* else must create a new string */

+  if (tb->nuse >= tb->size) {  /* need to grow string table? */

+    growstrtab(L, tb);

+    list = &tb->hash[lmod(h, tb->size)];  /* rehash with new size */

+  }

+  ts = createstrobj(L, l, LUA_VSHRSTR, h);

+  memcpy(getstr(ts), str, l * sizeof(char));

+  ts->shrlen = cast_byte(l);

+  ts->u.hnext = *list;

+  *list = ts;

+  tb->nuse++;

+  return ts;

+}

+

+

+/*

+** new string (with explicit length)

+*/

+TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {

+  if (l <= LUAI_MAXSHORTLEN)  /* short string? */

+    return internshrstr(L, str, l);

+  else {

+    TString *ts;

+    if (unlikely(l >= (MAX_SIZE - sizeof(TString))/sizeof(char)))

+      luaM_toobig(L);

+    ts = luaS_createlngstrobj(L, l);

+    memcpy(getstr(ts), str, l * sizeof(char));

+    return ts;

+  }

+}

+

+

+/*

+** Create or reuse a zero-terminated string, first checking in the

+** cache (using the string address as a key). The cache can contain

+** only zero-terminated strings, so it is safe to use 'strcmp' to

+** check hits.

+*/

+TString *luaS_new (lua_State *L, const char *str) {

+  unsigned int i = point2uint(str) % STRCACHE_N;  /* hash */

+  int j;

+  TString **p = G(L)->strcache[i];

+  for (j = 0; j < STRCACHE_M; j++) {

+    if (strcmp(str, getstr(p[j])) == 0)  /* hit? */

+      return p[j];  /* that is it */

+  }

+  /* normal route */

+  for (j = STRCACHE_M - 1; j > 0; j--)

+    p[j] = p[j - 1];  /* move out last element */

+  /* new element is first in the list */

+  p[0] = luaS_newlstr(L, str, strlen(str));

+  return p[0];

+}

+

+

+Udata *luaS_newudata (lua_State *L, size_t s, int nuvalue) {

+  Udata *u;

+  int i;

+  GCObject *o;

+  if (unlikely(s > MAX_SIZE - udatamemoffset(nuvalue)))

+    luaM_toobig(L);

+  o = luaC_newobj(L, LUA_VUSERDATA, sizeudata(nuvalue, s));

+  u = gco2u(o);

+  u->len = s;

+  u->nuvalue = nuvalue;

+  u->metatable = NULL;

+  for (i = 0; i < nuvalue; i++)

+    setnilvalue(&u->uv[i].uv);

+  return u;

+}

+

--- /dev/null

+++ b/lstring.h

@@ -1,0 +1,57 @@

+/*

+** $Id: lstring.h $

+** String table (keep all strings handled by Lua)

+** See Copyright Notice in lua.h

+*/

+

+#ifndef lstring_h

+#define lstring_h

+

+#include "lgc.h"

+#include "lobject.h"

+#include "lstate.h"

+

+

+/*

+** Memory-allocation error message must be preallocated (it cannot

+** be created after memory is exhausted)

+*/

+#define MEMERRMSG       "not enough memory"

+

+

+/*

+** Size of a TString: Size of the header plus space for the string

+** itself (including final '\0').

+*/

+#define sizelstring(l)  (offsetof(TString, contents) + ((l) + 1) * sizeof(char))

+

+#define luaS_newliteral(L, s)	(luaS_newlstr(L, "" s, \

+                                 (sizeof(s)/sizeof(char))-1))

+

+

+/*

+** test whether a string is a reserved word

+*/

+#define isreserved(s)	((s)->tt == LUA_VSHRSTR && (s)->extra > 0)

+

+

+/*

+** equality for short strings, which are always internalized

+*/

+#define eqshrstr(a,b)	check_exp((a)->tt == LUA_VSHRSTR, (a) == (b))

+

+

+LUAI_FUNC unsigned int luaS_hash (const char *str, size_t l, unsigned int seed);

+LUAI_FUNC unsigned int luaS_hashlongstr (TString *ts);

+LUAI_FUNC int luaS_eqlngstr (TString *a, TString *b);

+LUAI_FUNC void luaS_resize (lua_State *L, int newsize);

+LUAI_FUNC void luaS_clearcache (global_State *g);

+LUAI_FUNC void luaS_init (lua_State *L);

+LUAI_FUNC void luaS_remove (lua_State *L, TString *ts);

+LUAI_FUNC Udata *luaS_newudata (lua_State *L, size_t s, int nuvalue);

+LUAI_FUNC TString *luaS_newlstr (lua_State *L, const char *str, size_t l);

+LUAI_FUNC TString *luaS_new (lua_State *L, const char *str);

+LUAI_FUNC TString *luaS_createlngstrobj (lua_State *L, size_t l);

+

+

+#endif

--- /dev/null

+++ b/lstrlib.c

@@ -1,0 +1,1802 @@

+/*

+** $Id: lstrlib.c $

+** Standard library for string operations and pattern-matching

+** See Copyright Notice in lua.h

+*/

+

+#define lstrlib_c

+#define LUA_LIB

+

+#include "lprefix.h"

+

+

+#include <ctype.h>

+#include <float.h>

+#include <limits.h>

+#include <locale.h>

+#include <math.h>

+#include <stddef.h>

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "lauxlib.h"

+#include "lualib.h"

+

+

+/*

+** maximum number of captures that a pattern can do during

+** pattern-matching. This limit is arbitrary, but must fit in

+** an unsigned char.

+*/

+#if !defined(LUA_MAXCAPTURES)

+#define LUA_MAXCAPTURES		32

+#endif

+

+

+/* macro to 'unsign' a character */

+#define uchar(c)	((unsigned char)(c))

+

+

+/*

+** Some sizes are better limited to fit in 'int', but must also fit in

+** 'size_t'. (We assume that 'lua_Integer' cannot be smaller than 'int'.)

+*/

+#define MAX_SIZET	((size_t)(~(size_t)0))

+

+#define MAXSIZE  \

+	(sizeof(size_t) < sizeof(int) ? MAX_SIZET : (size_t)(INT_MAX))

+

+

+

+

+static int str_len (lua_State *L) {

+  size_t l;

+  luaL_checklstring(L, 1, &l);

+  lua_pushinteger(L, (lua_Integer)l);

+  return 1;

+}

+

+

+/*

+** translate a relative initial string position

+** (negative means back from end): clip result to [1, inf).

+** The length of any string in Lua must fit in a lua_Integer,

+** so there are no overflows in the casts.

+** The inverted comparison avoids a possible overflow

+** computing '-pos'.

+*/

+static size_t posrelatI (lua_Integer pos, size_t len) {

+  if (pos > 0)

+    return (size_t)pos;

+  else if (pos == 0)

+    return 1;

+  else if (pos < -(lua_Integer)len)  /* inverted comparison */

+    return 1;  /* clip to 1 */

+  else return len + (size_t)pos + 1;

+}

+

+

+/*

+** Gets an optional ending string position from argument 'arg',

+** with default value 'def'.

+** Negative means back from end: clip result to [0, len]

+*/

+static size_t getendpos (lua_State *L, int arg, lua_Integer def,

+                         size_t len) {

+  lua_Integer pos = luaL_optinteger(L, arg, def);

+  if (pos > (lua_Integer)len)

+    return len;

+  else if (pos >= 0)

+    return (size_t)pos;

+  else if (pos < -(lua_Integer)len)

+    return 0;

+  else return len + (size_t)pos + 1;

+}

+

+

+static int str_sub (lua_State *L) {

+  size_t l;

+  const char *s = luaL_checklstring(L, 1, &l);

+  size_t start = posrelatI(luaL_checkinteger(L, 2), l);

+  size_t end = getendpos(L, 3, -1, l);

+  if (start <= end)

+    lua_pushlstring(L, s + start - 1, (end - start) + 1);

+  else lua_pushliteral(L, "");

+  return 1;

+}

+

+

+static int str_reverse (lua_State *L) {

+  size_t l, i;

+  luaL_Buffer b;

+  const char *s = luaL_checklstring(L, 1, &l);

+  char *p = luaL_buffinitsize(L, &b, l);

+  for (i = 0; i < l; i++)

+    p[i] = s[l - i - 1];

+  luaL_pushresultsize(&b, l);

+  return 1;

+}

+

+

+static int str_lower (lua_State *L) {

+  size_t l;

+  size_t i;

+  luaL_Buffer b;

+  const char *s = luaL_checklstring(L, 1, &l);

+  char *p = luaL_buffinitsize(L, &b, l);

+  for (i=0; i<l; i++)

+    p[i] = tolower(uchar(s[i]));

+  luaL_pushresultsize(&b, l);

+  return 1;

+}

+

+

+static int str_upper (lua_State *L) {

+  size_t l;

+  size_t i;

+  luaL_Buffer b;

+  const char *s = luaL_checklstring(L, 1, &l);

+  char *p = luaL_buffinitsize(L, &b, l);

+  for (i=0; i<l; i++)

+    p[i] = toupper(uchar(s[i]));

+  luaL_pushresultsize(&b, l);

+  return 1;

+}

+

+

+static int str_rep (lua_State *L) {

+  size_t l, lsep;

+  const char *s = luaL_checklstring(L, 1, &l);

+  lua_Integer n = luaL_checkinteger(L, 2);

+  const char *sep = luaL_optlstring(L, 3, "", &lsep);

+  if (n <= 0) lua_pushliteral(L, "");

+  else if (l + lsep < l || l + lsep > MAXSIZE / n)  /* may overflow? */

+    return luaL_error(L, "resulting string too large");

+  else {

+    size_t totallen = (size_t)n * l + (size_t)(n - 1) * lsep;

+    luaL_Buffer b;

+    char *p = luaL_buffinitsize(L, &b, totallen);

+    while (n-- > 1) {  /* first n-1 copies (followed by separator) */

+      memcpy(p, s, l * sizeof(char)); p += l;

+      if (lsep > 0) {  /* empty 'memcpy' is not that cheap */

+        memcpy(p, sep, lsep * sizeof(char));

+        p += lsep;

+      }

+    }

+    memcpy(p, s, l * sizeof(char));  /* last copy (not followed by separator) */

+    luaL_pushresultsize(&b, totallen);

+  }

+  return 1;

+}

+

+

+static int str_byte (lua_State *L) {

+  size_t l;

+  const char *s = luaL_checklstring(L, 1, &l);

+  lua_Integer pi = luaL_optinteger(L, 2, 1);

+  size_t posi = posrelatI(pi, l);

+  size_t pose = getendpos(L, 3, pi, l);

+  int n, i;

+  if (posi > pose) return 0;  /* empty interval; return no values */

+  if (pose - posi >= (size_t)INT_MAX)  /* arithmetic overflow? */

+    return luaL_error(L, "string slice too long");

+  n = (int)(pose -  posi) + 1;

+  luaL_checkstack(L, n, "string slice too long");

+  for (i=0; i<n; i++)

+    lua_pushinteger(L, uchar(s[posi+i-1]));

+  return n;

+}

+

+

+static int str_char (lua_State *L) {

+  int n = lua_gettop(L);  /* number of arguments */

+  int i;

+  luaL_Buffer b;

+  char *p = luaL_buffinitsize(L, &b, n);

+  for (i=1; i<=n; i++) {

+    lua_Unsigned c = (lua_Unsigned)luaL_checkinteger(L, i);

+    luaL_argcheck(L, c <= (lua_Unsigned)UCHAR_MAX, i, "value out of range");

+    p[i - 1] = uchar(c);

+  }

+  luaL_pushresultsize(&b, n);

+  return 1;

+}

+

+

+/*

+** Buffer to store the result of 'string.dump'. It must be initialized

+** after the call to 'lua_dump', to ensure that the function is on the

+** top of the stack when 'lua_dump' is called. ('luaL_buffinit' might

+** push stuff.)

+*/

+struct str_Writer {

+  int init;  /* true iff buffer has been initialized */

+  luaL_Buffer B;

+};

+

+

+static int writer (lua_State *L, const void *b, size_t size, void *ud) {

+  struct str_Writer *state = (struct str_Writer *)ud;

+  if (!state->init) {

+    state->init = 1;

+    luaL_buffinit(L, &state->B);

+  }

+  luaL_addlstring(&state->B, (const char *)b, size);

+  return 0;

+}

+

+

+static int str_dump (lua_State *L) {

+  struct str_Writer state;

+  int strip = lua_toboolean(L, 2);

+  luaL_checktype(L, 1, LUA_TFUNCTION);

+  lua_settop(L, 1);  /* ensure function is on the top of the stack */

+  state.init = 0;

+  if (lua_dump(L, writer, &state, strip) != 0)

+    return luaL_error(L, "unable to dump given function");

+  luaL_pushresult(&state.B);

+  return 1;

+}

+

+

+

+/*

+** {======================================================

+** METAMETHODS

+** =======================================================

+*/

+

+#if defined(LUA_NOCVTS2N)	/* { */

+

+/* no coercion from strings to numbers */

+

+static const luaL_Reg stringmetamethods[] = {

+  {"__index", NULL},  /* placeholder */

+  {NULL, NULL}

+};

+

+#else		/* }{ */

+

+static int tonum (lua_State *L, int arg) {

+  if (lua_type(L, arg) == LUA_TNUMBER) {  /* already a number? */

+    lua_pushvalue(L, arg);

+    return 1;

+  }

+  else {  /* check whether it is a numerical string */

+    size_t len;

+    const char *s = lua_tolstring(L, arg, &len);

+    return (s != NULL && lua_stringtonumber(L, s) == len + 1);

+  }

+}

+

+

+static void trymt (lua_State *L, const char *mtname) {

+  lua_settop(L, 2);  /* back to the original arguments */

+  if (lua_type(L, 2) == LUA_TSTRING || !luaL_getmetafield(L, 2, mtname))

+    luaL_error(L, "attempt to %s a '%s' with a '%s'", mtname + 2,

+                  luaL_typename(L, -2), luaL_typename(L, -1));

+  lua_insert(L, -3);  /* put metamethod before arguments */

+  lua_call(L, 2, 1);  /* call metamethod */

+}

+

+

+static int arith (lua_State *L, int op, const char *mtname) {

+  if (tonum(L, 1) && tonum(L, 2))

+    lua_arith(L, op);  /* result will be on the top */

+  else

+    trymt(L, mtname);

+  return 1;

+}

+

+

+static int arith_add (lua_State *L) {

+  return arith(L, LUA_OPADD, "__add");

+}

+

+static int arith_sub (lua_State *L) {

+  return arith(L, LUA_OPSUB, "__sub");

+}

+

+static int arith_mul (lua_State *L) {

+  return arith(L, LUA_OPMUL, "__mul");

+}

+

+static int arith_mod (lua_State *L) {

+  return arith(L, LUA_OPMOD, "__mod");

+}

+

+static int arith_pow (lua_State *L) {

+  return arith(L, LUA_OPPOW, "__pow");

+}

+

+static int arith_div (lua_State *L) {

+  return arith(L, LUA_OPDIV, "__div");

+}

+

+static int arith_idiv (lua_State *L) {

+  return arith(L, LUA_OPIDIV, "__idiv");

+}

+

+static int arith_unm (lua_State *L) {

+  return arith(L, LUA_OPUNM, "__unm");

+}

+

+

+static const luaL_Reg stringmetamethods[] = {

+  {"__add", arith_add},

+  {"__sub", arith_sub},

+  {"__mul", arith_mul},

+  {"__mod", arith_mod},

+  {"__pow", arith_pow},

+  {"__div", arith_div},

+  {"__idiv", arith_idiv},

+  {"__unm", arith_unm},

+  {"__index", NULL},  /* placeholder */

+  {NULL, NULL}

+};

+

+#endif		/* } */

+

+/* }====================================================== */

+

+/*

+** {======================================================

+** PATTERN MATCHING

+** =======================================================

+*/

+

+

+#define CAP_UNFINISHED	(-1)

+#define CAP_POSITION	(-2)

+

+

+typedef struct MatchState {

+  const char *src_init;  /* init of source string */

+  const char *src_end;  /* end ('\0') of source string */

+  const char *p_end;  /* end ('\0') of pattern */

+  lua_State *L;

+  int matchdepth;  /* control for recursive depth (to avoid C stack overflow) */

+  unsigned char level;  /* total number of captures (finished or unfinished) */

+  struct {

+    const char *init;

+    ptrdiff_t len;

+  } capture[LUA_MAXCAPTURES];

+} MatchState;

+

+

+/* recursive function */

+static const char *match (MatchState *ms, const char *s, const char *p);

+

+

+/* maximum recursion depth for 'match' */

+#if !defined(MAXCCALLS)

+#define MAXCCALLS	200

+#endif

+

+

+#define L_ESC		'%'

+#define SPECIALS	"^$*+?.([%-"

+

+

+static int check_capture (MatchState *ms, int l) {

+  l -= '1';

+  if (l < 0 || l >= ms->level || ms->capture[l].len == CAP_UNFINISHED)

+    return luaL_error(ms->L, "invalid capture index %%%d", l + 1);

+  return l;

+}

+

+

+static int capture_to_close (MatchState *ms) {

+  int level = ms->level;

+  for (level--; level>=0; level--)

+    if (ms->capture[level].len == CAP_UNFINISHED) return level;

+  return luaL_error(ms->L, "invalid pattern capture");

+}

+

+

+static const char *classend (MatchState *ms, const char *p) {

+  switch (*p++) {

+    case L_ESC: {

+      if (p == ms->p_end)

+        luaL_error(ms->L, "malformed pattern (ends with '%%')");

+      return p+1;

+    }

+    case '[': {

+      if (*p == '^') p++;

+      do {  /* look for a ']' */

+        if (p == ms->p_end)

+          luaL_error(ms->L, "malformed pattern (missing ']')");

+        if (*(p++) == L_ESC && p < ms->p_end)

+          p++;  /* skip escapes (e.g. '%]') */

+      } while (*p != ']');

+      return p+1;

+    }

+    default: {

+      return p;

+    }

+  }

+}

+

+

+static int match_class (int c, int cl) {

+  int res;

+  switch (tolower(cl)) {

+    case 'a' : res = isalpha(c); break;

+    case 'c' : res = iscntrl(c); break;

+    case 'd' : res = isdigit(c); break;

+    case 'g' : res = isgraph(c); break;

+    case 'l' : res = islower(c); break;

+    case 'p' : res = ispunct(c); break;

+    case 's' : res = isspace(c); break;

+    case 'u' : res = isupper(c); break;

+    case 'w' : res = isalnum(c); break;

+    case 'x' : res = isxdigit(c); break;

+    case 'z' : res = (c == 0); break;  /* deprecated option */

+    default: return (cl == c);

+  }

+  return (islower(cl) ? res : !res);

+}

+

+

+static int matchbracketclass (int c, const char *p, const char *ec) {

+  int sig = 1;

+  if (*(p+1) == '^') {

+    sig = 0;

+    p++;  /* skip the '^' */

+  }

+  while (++p < ec) {

+    if (*p == L_ESC) {

+      p++;

+      if (match_class(c, uchar(*p)))

+        return sig;

+    }

+    else if ((*(p+1) == '-') && (p+2 < ec)) {

+      p+=2;

+      if (uchar(*(p-2)) <= c && c <= uchar(*p))

+        return sig;

+    }

+    else if (uchar(*p) == c) return sig;

+  }

+  return !sig;

+}

+

+

+static int singlematch (MatchState *ms, const char *s, const char *p,

+                        const char *ep) {

+  if (s >= ms->src_end)

+    return 0;

+  else {

+    int c = uchar(*s);

+    switch (*p) {

+      case '.': return 1;  /* matches any char */

+      case L_ESC: return match_class(c, uchar(*(p+1)));

+      case '[': return matchbracketclass(c, p, ep-1);

+      default:  return (uchar(*p) == c);

+    }

+  }

+}

+

+

+static const char *matchbalance (MatchState *ms, const char *s,

+                                   const char *p) {

+  if (p >= ms->p_end - 1)

+    luaL_error(ms->L, "malformed pattern (missing arguments to '%%b')");

+  if (*s != *p) return NULL;

+  else {

+    int b = *p;

+    int e = *(p+1);

+    int cont = 1;

+    while (++s < ms->src_end) {

+      if (*s == e) {

+        if (--cont == 0) return s+1;

+      }

+      else if (*s == b) cont++;

+    }

+  }

+  return NULL;  /* string ends out of balance */

+}

+

+

+static const char *max_expand (MatchState *ms, const char *s,

+                                 const char *p, const char *ep) {

+  ptrdiff_t i = 0;  /* counts maximum expand for item */

+  while (singlematch(ms, s + i, p, ep))

+    i++;

+  /* keeps trying to match with the maximum repetitions */

+  while (i>=0) {

+    const char *res = match(ms, (s+i), ep+1);

+    if (res) return res;

+    i--;  /* else didn't match; reduce 1 repetition to try again */

+  }

+  return NULL;

+}

+

+

+static const char *min_expand (MatchState *ms, const char *s,

+                                 const char *p, const char *ep) {

+  for (;;) {

+    const char *res = match(ms, s, ep+1);

+    if (res != NULL)

+      return res;

+    else if (singlematch(ms, s, p, ep))

+      s++;  /* try with one more repetition */

+    else return NULL;

+  }

+}

+

+

+static const char *start_capture (MatchState *ms, const char *s,

+                                    const char *p, int what) {

+  const char *res;

+  int level = ms->level;

+  if (level >= LUA_MAXCAPTURES) luaL_error(ms->L, "too many captures");

+  ms->capture[level].init = s;

+  ms->capture[level].len = what;

+  ms->level = level+1;

+  if ((res=match(ms, s, p)) == NULL)  /* match failed? */

+    ms->level--;  /* undo capture */

+  return res;

+}

+

+

+static const char *end_capture (MatchState *ms, const char *s,

+                                  const char *p) {

+  int l = capture_to_close(ms);

+  const char *res;

+  ms->capture[l].len = s - ms->capture[l].init;  /* close capture */

+  if ((res = match(ms, s, p)) == NULL)  /* match failed? */

+    ms->capture[l].len = CAP_UNFINISHED;  /* undo capture */

+  return res;

+}

+

+

+static const char *match_capture (MatchState *ms, const char *s, int l) {

+  size_t len;

+  l = check_capture(ms, l);

+  len = ms->capture[l].len;

+  if ((size_t)(ms->src_end-s) >= len &&

+      memcmp(ms->capture[l].init, s, len) == 0)

+    return s+len;

+  else return NULL;

+}

+

+

+static const char *match (MatchState *ms, const char *s, const char *p) {

+  if (ms->matchdepth-- == 0)

+    luaL_error(ms->L, "pattern too complex");

+  init: /* using goto's to optimize tail recursion */

+  if (p != ms->p_end) {  /* end of pattern? */

+    switch (*p) {

+      case '(': {  /* start capture */

+        if (*(p + 1) == ')')  /* position capture? */

+          s = start_capture(ms, s, p + 2, CAP_POSITION);

+        else

+          s = start_capture(ms, s, p + 1, CAP_UNFINISHED);

+        break;

+      }

+      case ')': {  /* end capture */

+        s = end_capture(ms, s, p + 1);

+        break;

+      }

+      case '$': {

+        if ((p + 1) != ms->p_end)  /* is the '$' the last char in pattern? */

+          goto dflt;  /* no; go to default */

+        s = (s == ms->src_end) ? s : NULL;  /* check end of string */

+        break;

+      }

+      case L_ESC: {  /* escaped sequences not in the format class[*+?-]? */

+        switch (*(p + 1)) {

+          case 'b': {  /* balanced string? */

+            s = matchbalance(ms, s, p + 2);

+            if (s != NULL) {

+              p += 4; goto init;  /* return match(ms, s, p + 4); */

+            }  /* else fail (s == NULL) */

+            break;

+          }

+          case 'f': {  /* frontier? */

+            const char *ep; char previous;

+            p += 2;

+            if (*p != '[')

+              luaL_error(ms->L, "missing '[' after '%%f' in pattern");

+            ep = classend(ms, p);  /* points to what is next */

+            previous = (s == ms->src_init) ? '\0' : *(s - 1);

+            if (!matchbracketclass(uchar(previous), p, ep - 1) &&

+               matchbracketclass(uchar(*s), p, ep - 1)) {

+              p = ep; goto init;  /* return match(ms, s, ep); */

+            }

+            s = NULL;  /* match failed */

+            break;

+          }

+          case '0': case '1': case '2': case '3':

+          case '4': case '5': case '6': case '7':

+          case '8': case '9': {  /* capture results (%0-%9)? */

+            s = match_capture(ms, s, uchar(*(p + 1)));

+            if (s != NULL) {

+              p += 2; goto init;  /* return match(ms, s, p + 2) */

+            }

+            break;

+          }

+          default: goto dflt;

+        }

+        break;

+      }

+      default: dflt: {  /* pattern class plus optional suffix */

+        const char *ep = classend(ms, p);  /* points to optional suffix */

+        /* does not match at least once? */

+        if (!singlematch(ms, s, p, ep)) {

+          if (*ep == '*' || *ep == '?' || *ep == '-') {  /* accept empty? */

+            p = ep + 1; goto init;  /* return match(ms, s, ep + 1); */

+          }

+          else  /* '+' or no suffix */

+            s = NULL;  /* fail */

+        }

+        else {  /* matched once */

+          switch (*ep) {  /* handle optional suffix */

+            case '?': {  /* optional */

+              const char *res;

+              if ((res = match(ms, s + 1, ep + 1)) != NULL)

+                s = res;

+              else {

+                p = ep + 1; goto init;  /* else return match(ms, s, ep + 1); */

+              }

+              break;

+            }

+            case '+':  /* 1 or more repetitions */

+              s++;  /* 1 match already done */

+              /* FALLTHROUGH */

+            case '*':  /* 0 or more repetitions */

+              s = max_expand(ms, s, p, ep);

+              break;

+            case '-':  /* 0 or more repetitions (minimum) */

+              s = min_expand(ms, s, p, ep);

+              break;

+            default:  /* no suffix */

+              s++; p = ep; goto init;  /* return match(ms, s + 1, ep); */

+          }

+        }

+        break;

+      }

+    }

+  }

+  ms->matchdepth++;

+  return s;

+}

+

+

+

+static const char *lmemfind (const char *s1, size_t l1,

+                               const char *s2, size_t l2) {

+  if (l2 == 0) return s1;  /* empty strings are everywhere */

+  else if (l2 > l1) return NULL;  /* avoids a negative 'l1' */

+  else {

+    const char *init;  /* to search for a '*s2' inside 's1' */

+    l2--;  /* 1st char will be checked by 'memchr' */

+    l1 = l1-l2;  /* 's2' cannot be found after that */

+    while (l1 > 0 && (init = (const char *)memchr(s1, *s2, l1)) != NULL) {

+      init++;   /* 1st char is already checked */

+      if (memcmp(init, s2+1, l2) == 0)

+        return init-1;

+      else {  /* correct 'l1' and 's1' to try again */

+        l1 -= init-s1;

+        s1 = init;

+      }

+    }

+    return NULL;  /* not found */

+  }

+}

+

+

+/*

+** get information about the i-th capture. If there are no captures

+** and 'i==0', return information about the whole match, which

+** is the range 's'..'e'. If the capture is a string, return

+** its length and put its address in '*cap'. If it is an integer

+** (a position), push it on the stack and return CAP_POSITION.

+*/

+static size_t get_onecapture (MatchState *ms, int i, const char *s,

+                              const char *e, const char **cap) {

+  if (i >= ms->level) {

+    if (i != 0)

+      luaL_error(ms->L, "invalid capture index %%%d", i + 1);

+    *cap = s;

+    return e - s;

+  }

+  else {

+    ptrdiff_t capl = ms->capture[i].len;

+    *cap = ms->capture[i].init;

+    if (capl == CAP_UNFINISHED)

+      luaL_error(ms->L, "unfinished capture");

+    else if (capl == CAP_POSITION)

+      lua_pushinteger(ms->L, (ms->capture[i].init - ms->src_init) + 1);

+    return capl;

+  }

+}

+

+

+/*

+** Push the i-th capture on the stack.

+*/

+static void push_onecapture (MatchState *ms, int i, const char *s,

+                                                    const char *e) {

+  const char *cap;

+  ptrdiff_t l = get_onecapture(ms, i, s, e, &cap);

+  if (l != CAP_POSITION)

+    lua_pushlstring(ms->L, cap, l);

+  /* else position was already pushed */

+}

+

+

+static int push_captures (MatchState *ms, const char *s, const char *e) {

+  int i;

+  int nlevels = (ms->level == 0 && s) ? 1 : ms->level;

+  luaL_checkstack(ms->L, nlevels, "too many captures");

+  for (i = 0; i < nlevels; i++)

+    push_onecapture(ms, i, s, e);

+  return nlevels;  /* number of strings pushed */

+}

+

+

+/* check whether pattern has no special characters */

+static int nospecials (const char *p, size_t l) {

+  size_t upto = 0;

+  do {

+    if (strpbrk(p + upto, SPECIALS))

+      return 0;  /* pattern has a special character */

+    upto += strlen(p + upto) + 1;  /* may have more after \0 */

+  } while (upto <= l);

+  return 1;  /* no special chars found */

+}

+

+

+static void prepstate (MatchState *ms, lua_State *L,

+                       const char *s, size_t ls, const char *p, size_t lp) {

+  ms->L = L;

+  ms->matchdepth = MAXCCALLS;

+  ms->src_init = s;

+  ms->src_end = s + ls;

+  ms->p_end = p + lp;

+}

+

+

+static void reprepstate (MatchState *ms) {

+  ms->level = 0;

+  lua_assert(ms->matchdepth == MAXCCALLS);

+}

+

+

+static int str_find_aux (lua_State *L, int find) {

+  size_t ls, lp;

+  const char *s = luaL_checklstring(L, 1, &ls);

+  const char *p = luaL_checklstring(L, 2, &lp);

+  size_t init = posrelatI(luaL_optinteger(L, 3, 1), ls) - 1;

+  if (init > ls) {  /* start after string's end? */

+    luaL_pushfail(L);  /* cannot find anything */

+    return 1;

+  }

+  /* explicit request or no special characters? */

+  if (find && (lua_toboolean(L, 4) || nospecials(p, lp))) {

+    /* do a plain search */

+    const char *s2 = lmemfind(s + init, ls - init, p, lp);

+    if (s2) {

+      lua_pushinteger(L, (s2 - s) + 1);

+      lua_pushinteger(L, (s2 - s) + lp);

+      return 2;

+    }

+  }

+  else {

+    MatchState ms;

+    const char *s1 = s + init;

+    int anchor = (*p == '^');

+    if (anchor) {

+      p++; lp--;  /* skip anchor character */

+    }

+    prepstate(&ms, L, s, ls, p, lp);

+    do {

+      const char *res;

+      reprepstate(&ms);

+      if ((res=match(&ms, s1, p)) != NULL) {

+        if (find) {

+          lua_pushinteger(L, (s1 - s) + 1);  /* start */

+          lua_pushinteger(L, res - s);   /* end */

+          return push_captures(&ms, NULL, 0) + 2;

+        }

+        else

+          return push_captures(&ms, s1, res);

+      }

+    } while (s1++ < ms.src_end && !anchor);

+  }

+  luaL_pushfail(L);  /* not found */

+  return 1;

+}

+

+

+static int str_find (lua_State *L) {

+  return str_find_aux(L, 1);

+}

+

+

+static int str_match (lua_State *L) {

+  return str_find_aux(L, 0);

+}

+

+

+/* state for 'gmatch' */

+typedef struct GMatchState {

+  const char *src;  /* current position */

+  const char *p;  /* pattern */

+  const char *lastmatch;  /* end of last match */

+  MatchState ms;  /* match state */

+} GMatchState;

+

+

+static int gmatch_aux (lua_State *L) {

+  GMatchState *gm = (GMatchState *)lua_touserdata(L, lua_upvalueindex(3));

+  const char *src;

+  gm->ms.L = L;

+  for (src = gm->src; src <= gm->ms.src_end; src++) {

+    const char *e;

+    reprepstate(&gm->ms);

+    if ((e = match(&gm->ms, src, gm->p)) != NULL && e != gm->lastmatch) {

+      gm->src = gm->lastmatch = e;

+      return push_captures(&gm->ms, src, e);

+    }

+  }

+  return 0;  /* not found */

+}

+

+

+static int gmatch (lua_State *L) {

+  size_t ls, lp;

+  const char *s = luaL_checklstring(L, 1, &ls);

+  const char *p = luaL_checklstring(L, 2, &lp);

+  size_t init = posrelatI(luaL_optinteger(L, 3, 1), ls) - 1;

+  GMatchState *gm;

+  lua_settop(L, 2);  /* keep strings on closure to avoid being collected */

+  gm = (GMatchState *)lua_newuserdatauv(L, sizeof(GMatchState), 0);

+  if (init > ls)  /* start after string's end? */

+    init = ls + 1;  /* avoid overflows in 's + init' */

+  prepstate(&gm->ms, L, s, ls, p, lp);

+  gm->src = s + init; gm->p = p; gm->lastmatch = NULL;

+  lua_pushcclosure(L, gmatch_aux, 3);

+  return 1;

+}

+

+

+static void add_s (MatchState *ms, luaL_Buffer *b, const char *s,

+                                                   const char *e) {

+  size_t l;

+  lua_State *L = ms->L;

+  const char *news = lua_tolstring(L, 3, &l);

+  const char *p;

+  while ((p = (char *)memchr(news, L_ESC, l)) != NULL) {

+    luaL_addlstring(b, news, p - news);

+    p++;  /* skip ESC */

+    if (*p == L_ESC)  /* '%%' */

+      luaL_addchar(b, *p);

+    else if (*p == '0')  /* '%0' */

+        luaL_addlstring(b, s, e - s);

+    else if (isdigit(uchar(*p))) {  /* '%n' */

+      const char *cap;

+      ptrdiff_t resl = get_onecapture(ms, *p - '1', s, e, &cap);

+      if (resl == CAP_POSITION)

+        luaL_addvalue(b);  /* add position to accumulated result */

+      else

+        luaL_addlstring(b, cap, resl);

+    }

+    else

+      luaL_error(L, "invalid use of '%c' in replacement string", L_ESC);

+    l -= p + 1 - news;

+    news = p + 1;

+  }

+  luaL_addlstring(b, news, l);

+}

+

+

+/*

+** Add the replacement value to the string buffer 'b'.

+** Return true if the original string was changed. (Function calls and

+** table indexing resulting in nil or false do not change the subject.)

+*/

+static int add_value (MatchState *ms, luaL_Buffer *b, const char *s,

+                                      const char *e, int tr) {

+  lua_State *L = ms->L;

+  switch (tr) {

+    case LUA_TFUNCTION: {  /* call the function */

+      int n;

+      lua_pushvalue(L, 3);  /* push the function */

+      n = push_captures(ms, s, e);  /* all captures as arguments */

+      lua_call(L, n, 1);  /* call it */

+      break;

+    }

+    case LUA_TTABLE: {  /* index the table */

+      push_onecapture(ms, 0, s, e);  /* first capture is the index */

+      lua_gettable(L, 3);

+      break;

+    }

+    default: {  /* LUA_TNUMBER or LUA_TSTRING */

+      add_s(ms, b, s, e);  /* add value to the buffer */

+      return 1;  /* something changed */

+    }

+  }

+  if (!lua_toboolean(L, -1)) {  /* nil or false? */

+    lua_pop(L, 1);  /* remove value */

+    luaL_addlstring(b, s, e - s);  /* keep original text */

+    return 0;  /* no changes */

+  }

+  else if (!lua_isstring(L, -1))

+    return luaL_error(L, "invalid replacement value (a %s)",

+                         luaL_typename(L, -1));

+  else {

+    luaL_addvalue(b);  /* add result to accumulator */

+    return 1;  /* something changed */

+  }

+}

+

+

+static int str_gsub (lua_State *L) {

+  size_t srcl, lp;

+  const char *src = luaL_checklstring(L, 1, &srcl);  /* subject */

+  const char *p = luaL_checklstring(L, 2, &lp);  /* pattern */

+  const char *lastmatch = NULL;  /* end of last match */

+  int tr = lua_type(L, 3);  /* replacement type */

+  lua_Integer max_s = luaL_optinteger(L, 4, srcl + 1);  /* max replacements */

+  int anchor = (*p == '^');

+  lua_Integer n = 0;  /* replacement count */

+  int changed = 0;  /* change flag */

+  MatchState ms;

+  luaL_Buffer b;

+  luaL_argexpected(L, tr == LUA_TNUMBER || tr == LUA_TSTRING ||

+                   tr == LUA_TFUNCTION || tr == LUA_TTABLE, 3,

+                      "string/function/table");

+  luaL_buffinit(L, &b);

+  if (anchor) {

+    p++; lp--;  /* skip anchor character */

+  }

+  prepstate(&ms, L, src, srcl, p, lp);

+  while (n < max_s) {

+    const char *e;

+    reprepstate(&ms);  /* (re)prepare state for new match */

+    if ((e = match(&ms, src, p)) != NULL && e != lastmatch) {  /* match? */

+      n++;

+      changed = add_value(&ms, &b, src, e, tr) | changed;

+      src = lastmatch = e;

+    }

+    else if (src < ms.src_end)  /* otherwise, skip one character */

+      luaL_addchar(&b, *src++);

+    else break;  /* end of subject */

+    if (anchor) break;

+  }

+  if (!changed)  /* no changes? */

+    lua_pushvalue(L, 1);  /* return original string */

+  else {  /* something changed */

+    luaL_addlstring(&b, src, ms.src_end-src);

+    luaL_pushresult(&b);  /* create and return new string */

+  }

+  lua_pushinteger(L, n);  /* number of substitutions */

+  return 2;

+}

+

+/* }====================================================== */

+

+

+

+/*

+** {======================================================

+** STRING FORMAT

+** =======================================================

+*/

+

+#if !defined(lua_number2strx)	/* { */

+

+/*

+** Hexadecimal floating-point formatter

+*/

+

+#define SIZELENMOD	(sizeof(LUA_NUMBER_FRMLEN)/sizeof(char))

+

+

+/*

+** Number of bits that goes into the first digit. It can be any value

+** between 1 and 4; the following definition tries to align the number

+** to nibble boundaries by making what is left after that first digit a

+** multiple of 4.

+*/

+#define L_NBFD		((l_floatatt(MANT_DIG) - 1)%4 + 1)

+

+

+/*

+** Add integer part of 'x' to buffer and return new 'x'

+*/

+static lua_Number adddigit (char *buff, int n, lua_Number x) {

+  lua_Number dd = l_mathop(floor)(x);  /* get integer part from 'x' */

+  int d = (int)dd;

+  buff[n] = (d < 10 ? d + '0' : d - 10 + 'a');  /* add to buffer */

+  return x - dd;  /* return what is left */

+}

+

+

+static int num2straux (char *buff, int sz, lua_Number x) {

+  /* if 'inf' or 'NaN', format it like '%g' */

+  if (x != x || x == (lua_Number)HUGE_VAL || x == -(lua_Number)HUGE_VAL)

+    return l_sprintf(buff, sz, LUA_NUMBER_FMT, (LUAI_UACNUMBER)x);

+  else if (x == 0) {  /* can be -0... */

+    /* create "0" or "-0" followed by exponent */

+    return l_sprintf(buff, sz, LUA_NUMBER_FMT "x0p+0", (LUAI_UACNUMBER)x);

+  }

+  else {

+    int e;

+    lua_Number m = l_mathop(frexp)(x, &e);  /* 'x' fraction and exponent */

+    int n = 0;  /* character count */

+    if (m < 0) {  /* is number negative? */

+      buff[n++] = '-';  /* add sign */

+      m = -m;  /* make it positive */

+    }

+    buff[n++] = '0'; buff[n++] = 'x';  /* add "0x" */

+    m = adddigit(buff, n++, m * (1 << L_NBFD));  /* add first digit */

+    e -= L_NBFD;  /* this digit goes before the radix point */

+    if (m > 0) {  /* more digits? */

+      buff[n++] = lua_getlocaledecpoint();  /* add radix point */

+      do {  /* add as many digits as needed */

+        m = adddigit(buff, n++, m * 16);

+      } while (m > 0);

+    }

+    n += l_sprintf(buff + n, sz - n, "p%+d", e);  /* add exponent */

+    lua_assert(n < sz);

+    return n;

+  }

+}

+

+

+static int lua_number2strx (lua_State *L, char *buff, int sz,

+                            const char *fmt, lua_Number x) {

+  int n = num2straux(buff, sz, x);

+  if (fmt[SIZELENMOD] == 'A') {

+    int i;

+    for (i = 0; i < n; i++)

+      buff[i] = toupper(uchar(buff[i]));

+  }

+  else if (fmt[SIZELENMOD] != 'a')

+    return luaL_error(L, "modifiers for format '%%a'/'%%A' not implemented");

+  return n;

+}

+

+#endif				/* } */

+

+

+/*

+** Maximum size for items formatted with '%f'. This size is produced

+** by format('%.99f', -maxfloat), and is equal to 99 + 3 ('-', '.',

+** and '\0') + number of decimal digits to represent maxfloat (which

+** is maximum exponent + 1). (99+3+1, adding some extra, 110)

+*/

+#define MAX_ITEMF	(110 + l_floatatt(MAX_10_EXP))

+

+

+/*

+** All formats except '%f' do not need that large limit.  The other

+** float formats use exponents, so that they fit in the 99 limit for

+** significant digits; 's' for large strings and 'q' add items directly

+** to the buffer; all integer formats also fit in the 99 limit.  The

+** worst case are floats: they may need 99 significant digits, plus

+** '0x', '-', '.', 'e+XXXX', and '\0'. Adding some extra, 120.

+*/

+#define MAX_ITEM	120

+

+

+/* valid flags in a format specification */

+#if !defined(L_FMTFLAGS)

+#define L_FMTFLAGS	"-+ #0"

+#endif

+

+

+/*

+** maximum size of each format specification (such as "%-099.99d")

+*/

+#define MAX_FORMAT	32

+

+

+static void addquoted (luaL_Buffer *b, const char *s, size_t len) {

+  luaL_addchar(b, '"');

+  while (len--) {

+    if (*s == '"' || *s == '\\' || *s == '\n') {

+      luaL_addchar(b, '\\');

+      luaL_addchar(b, *s);

+    }

+    else if (iscntrl(uchar(*s))) {

+      char buff[10];

+      if (!isdigit(uchar(*(s+1))))

+        l_sprintf(buff, sizeof(buff), "\\%d", (int)uchar(*s));

+      else

+        l_sprintf(buff, sizeof(buff), "\\%03d", (int)uchar(*s));

+      luaL_addstring(b, buff);

+    }

+    else

+      luaL_addchar(b, *s);

+    s++;

+  }

+  luaL_addchar(b, '"');

+}

+

+

+/*

+** Serialize a floating-point number in such a way that it can be

+** scanned back by Lua. Use hexadecimal format for "common" numbers

+** (to preserve precision); inf, -inf, and NaN are handled separately.

+** (NaN cannot be expressed as a numeral, so we write '(0/0)' for it.)

+*/

+static int quotefloat (lua_State *L, char *buff, lua_Number n) {

+  const char *s;  /* for the fixed representations */

+  if (n == (lua_Number)HUGE_VAL)  /* inf? */

+    s = "1e9999";

+  else if (n == -(lua_Number)HUGE_VAL)  /* -inf? */

+    s = "-1e9999";

+  else if (n != n)  /* NaN? */

+    s = "(0/0)";

+  else {  /* format number as hexadecimal */

+    int  nb = lua_number2strx(L, buff, MAX_ITEM,

+                                 "%" LUA_NUMBER_FRMLEN "a", n);

+    /* ensures that 'buff' string uses a dot as the radix character */

+    if (memchr(buff, '.', nb) == NULL) {  /* no dot? */

+      char point = lua_getlocaledecpoint();  /* try locale point */

+      char *ppoint = (char *)memchr(buff, point, nb);

+      if (ppoint) *ppoint = '.';  /* change it to a dot */

+    }

+    return nb;

+  }

+  /* for the fixed representations */

+  return l_sprintf(buff, MAX_ITEM, "%s", s);

+}

+

+

+static void addliteral (lua_State *L, luaL_Buffer *b, int arg) {

+  switch (lua_type(L, arg)) {

+    case LUA_TSTRING: {

+      size_t len;

+      const char *s = lua_tolstring(L, arg, &len);

+      addquoted(b, s, len);

+      break;

+    }

+    case LUA_TNUMBER: {

+      char *buff = luaL_prepbuffsize(b, MAX_ITEM);

+      int nb;

+      if (!lua_isinteger(L, arg))  /* float? */

+        nb = quotefloat(L, buff, lua_tonumber(L, arg));

+      else {  /* integers */

+        lua_Integer n = lua_tointeger(L, arg);

+        const char *format = (n == LUA_MININTEGER)  /* corner case? */

+                           ? "0x%" LUA_INTEGER_FRMLEN "x"  /* use hex */

+                           : LUA_INTEGER_FMT;  /* else use default format */

+        nb = l_sprintf(buff, MAX_ITEM, format, (LUAI_UACINT)n);

+      }

+      luaL_addsize(b, nb);

+      break;

+    }

+    case LUA_TNIL: case LUA_TBOOLEAN: {

+      luaL_tolstring(L, arg, NULL);

+      luaL_addvalue(b);

+      break;

+    }

+    default: {

+      luaL_argerror(L, arg, "value has no literal form");

+    }

+  }

+}

+

+

+static const char *scanformat (lua_State *L, const char *strfrmt, char *form) {

+  const char *p = strfrmt;

+  while (*p != '\0' && strchr(L_FMTFLAGS, *p) != NULL) p++;  /* skip flags */

+  if ((size_t)(p - strfrmt) >= sizeof(L_FMTFLAGS)/sizeof(char))

+    luaL_error(L, "invalid format (repeated flags)");

+  if (isdigit(uchar(*p))) p++;  /* skip width */

+  if (isdigit(uchar(*p))) p++;  /* (2 digits at most) */

+  if (*p == '.') {

+    p++;

+    if (isdigit(uchar(*p))) p++;  /* skip precision */

+    if (isdigit(uchar(*p))) p++;  /* (2 digits at most) */

+  }

+  if (isdigit(uchar(*p)))

+    luaL_error(L, "invalid format (width or precision too long)");

+  *(form++) = '%';

+  memcpy(form, strfrmt, ((p - strfrmt) + 1) * sizeof(char));

+  form += (p - strfrmt) + 1;

+  *form = '\0';

+  return p;

+}

+

+

+/*

+** add length modifier into formats

+*/

+static void addlenmod (char *form, const char *lenmod) {

+  size_t l = strlen(form);

+  size_t lm = strlen(lenmod);

+  char spec = form[l - 1];

+  strcpy(form + l - 1, lenmod);

+  form[l + lm - 1] = spec;

+  form[l + lm] = '\0';

+}

+

+

+static int str_format (lua_State *L) {

+  int top = lua_gettop(L);

+  int arg = 1;

+  size_t sfl;

+  const char *strfrmt = luaL_checklstring(L, arg, &sfl);

+  const char *strfrmt_end = strfrmt+sfl;

+  luaL_Buffer b;

+  luaL_buffinit(L, &b);

+  while (strfrmt < strfrmt_end) {

+    if (*strfrmt != L_ESC)

+      luaL_addchar(&b, *strfrmt++);

+    else if (*++strfrmt == L_ESC)

+      luaL_addchar(&b, *strfrmt++);  /* %% */

+    else { /* format item */

+      char form[MAX_FORMAT];  /* to store the format ('%...') */

+      int maxitem = MAX_ITEM;

+      char *buff = luaL_prepbuffsize(&b, maxitem);  /* to put formatted item */

+      int nb = 0;  /* number of bytes in added item */

+      if (++arg > top)

+        return luaL_argerror(L, arg, "no value");

+      strfrmt = scanformat(L, strfrmt, form);

+      switch (*strfrmt++) {

+        case 'c': {

+          nb = l_sprintf(buff, maxitem, form, (int)luaL_checkinteger(L, arg));

+          break;

+        }

+        case 'd': case 'i':

+        case 'o': case 'u': case 'x': case 'X': {

+          lua_Integer n = luaL_checkinteger(L, arg);

+          addlenmod(form, LUA_INTEGER_FRMLEN);

+          nb = l_sprintf(buff, maxitem, form, (LUAI_UACINT)n);

+          break;

+        }

+        case 'a': case 'A':

+          addlenmod(form, LUA_NUMBER_FRMLEN);

+          nb = lua_number2strx(L, buff, maxitem, form,

+                                  luaL_checknumber(L, arg));

+          break;

+        case 'f':

+          maxitem = MAX_ITEMF;  /* extra space for '%f' */

+          buff = luaL_prepbuffsize(&b, maxitem);

+          /* FALLTHROUGH */

+        case 'e': case 'E': case 'g': case 'G': {

+          lua_Number n = luaL_checknumber(L, arg);

+          addlenmod(form, LUA_NUMBER_FRMLEN);

+          nb = l_sprintf(buff, maxitem, form, (LUAI_UACNUMBER)n);

+          break;

+        }

+        case 'p': {

+          const void *p = lua_topointer(L, arg);

+          if (p == NULL) {  /* avoid calling 'printf' with argument NULL */

+            p = "(null)";  /* result */

+            form[strlen(form) - 1] = 's';  /* format it as a string */

+          }

+          nb = l_sprintf(buff, maxitem, form, p);

+          break;

+        }

+        case 'q': {

+          if (form[2] != '\0')  /* modifiers? */

+            return luaL_error(L, "specifier '%%q' cannot have modifiers");

+          addliteral(L, &b, arg);

+          break;

+        }

+        case 's': {

+          size_t l;

+          const char *s = luaL_tolstring(L, arg, &l);

+          if (form[2] == '\0')  /* no modifiers? */

+            luaL_addvalue(&b);  /* keep entire string */

+          else {

+            luaL_argcheck(L, l == strlen(s), arg, "string contains zeros");

+            if (!strchr(form, '.') && l >= 100) {

+              /* no precision and string is too long to be formatted */

+              luaL_addvalue(&b);  /* keep entire string */

+            }

+            else {  /* format the string into 'buff' */

+              nb = l_sprintf(buff, maxitem, form, s);

+              lua_pop(L, 1);  /* remove result from 'luaL_tolstring' */

+            }

+          }

+          break;

+        }

+        default: {  /* also treat cases 'pnLlh' */

+          return luaL_error(L, "invalid conversion '%s' to 'format'", form);

+        }

+      }

+      lua_assert(nb < maxitem);

+      luaL_addsize(&b, nb);

+    }

+  }

+  luaL_pushresult(&b);

+  return 1;

+}

+

+/* }====================================================== */

+

+

+/*

+** {======================================================

+** PACK/UNPACK

+** =======================================================

+*/

+

+

+/* value used for padding */

+#if !defined(LUAL_PACKPADBYTE)

+#define LUAL_PACKPADBYTE		0x00

+#endif

+

+/* maximum size for the binary representation of an integer */

+#define MAXINTSIZE	16

+

+/* number of bits in a character */

+#define NB	CHAR_BIT

+

+/* mask for one character (NB 1's) */

+#define MC	((1 << NB) - 1)

+

+/* size of a lua_Integer */

+#define SZINT	((int)sizeof(lua_Integer))

+

+

+/* dummy union to get native endianness */

+static const union {

+  int dummy;

+  char little;  /* true iff machine is little endian */

+} nativeendian = {1};

+

+

+/* dummy structure to get native alignment requirements */

+struct cD {

+  char c;

+  union { double d; void *p; lua_Integer i; lua_Number n; } u;

+};

+

+#define MAXALIGN	(offsetof(struct cD, u))

+

+

+/*

+** Union for serializing floats

+*/

+typedef union Ftypes {

+  float f;

+  double d;

+  lua_Number n;

+} Ftypes;

+

+

+/*

+** information to pack/unpack stuff

+*/

+typedef struct Header {

+  lua_State *L;

+  int islittle;

+  int maxalign;

+} Header;

+

+

+/*

+** options for pack/unpack

+*/

+typedef enum KOption {

+  Kint,		/* signed integers */

+  Kuint,	/* unsigned integers */

+  Kfloat,	/* floating-point numbers */

+  Kchar,	/* fixed-length strings */

+  Kstring,	/* strings with prefixed length */

+  Kzstr,	/* zero-terminated strings */

+  Kpadding,	/* padding */

+  Kpaddalign,	/* padding for alignment */

+  Knop		/* no-op (configuration or spaces) */

+} KOption;

+

+

+/*

+** Read an integer numeral from string 'fmt' or return 'df' if

+** there is no numeral

+*/

+static int digit (int c) { return '0' <= c && c <= '9'; }

+

+static int getnum (const char **fmt, int df) {

+  if (!digit(**fmt))  /* no number? */

+    return df;  /* return default value */

+  else {

+    int a = 0;

+    do {

+      a = a*10 + (*((*fmt)++) - '0');

+    } while (digit(**fmt) && a <= ((int)MAXSIZE - 9)/10);

+    return a;

+  }

+}

+

+

+/*

+** Read an integer numeral and raises an error if it is larger

+** than the maximum size for integers.

+*/

+static int getnumlimit (Header *h, const char **fmt, int df) {

+  int sz = getnum(fmt, df);

+  if (sz > MAXINTSIZE || sz <= 0)

+    return luaL_error(h->L, "integral size (%d) out of limits [1,%d]",

+                            sz, MAXINTSIZE);

+  return sz;

+}

+

+

+/*

+** Initialize Header

+*/

+static void initheader (lua_State *L, Header *h) {

+  h->L = L;

+  h->islittle = nativeendian.little;

+  h->maxalign = 1;

+}

+

+

+/*

+** Read and classify next option. 'size' is filled with option's size.

+*/

+static KOption getoption (Header *h, const char **fmt, int *size) {

+  int opt = *((*fmt)++);

+  *size = 0;  /* default */

+  switch (opt) {

+    case 'b': *size = sizeof(char); return Kint;

+    case 'B': *size = sizeof(char); return Kuint;

+    case 'h': *size = sizeof(short); return Kint;

+    case 'H': *size = sizeof(short); return Kuint;

+    case 'l': *size = sizeof(long); return Kint;

+    case 'L': *size = sizeof(long); return Kuint;

+    case 'j': *size = sizeof(lua_Integer); return Kint;

+    case 'J': *size = sizeof(lua_Integer); return Kuint;

+    case 'T': *size = sizeof(size_t); return Kuint;

+    case 'f': *size = sizeof(float); return Kfloat;

+    case 'd': *size = sizeof(double); return Kfloat;

+    case 'n': *size = sizeof(lua_Number); return Kfloat;

+    case 'i': *size = getnumlimit(h, fmt, sizeof(int)); return Kint;

+    case 'I': *size = getnumlimit(h, fmt, sizeof(int)); return Kuint;

+    case 's': *size = getnumlimit(h, fmt, sizeof(size_t)); return Kstring;

+    case 'c':

+      *size = getnum(fmt, -1);

+      if (*size == -1)

+        luaL_error(h->L, "missing size for format option 'c'");

+      return Kchar;

+    case 'z': return Kzstr;

+    case 'x': *size = 1; return Kpadding;

+    case 'X': return Kpaddalign;

+    case ' ': break;

+    case '<': h->islittle = 1; break;

+    case '>': h->islittle = 0; break;

+    case '=': h->islittle = nativeendian.little; break;

+    case '!': h->maxalign = getnumlimit(h, fmt, MAXALIGN); break;

+    default: luaL_error(h->L, "invalid format option '%c'", opt);

+  }

+  return Knop;

+}

+

+

+/*

+** Read, classify, and fill other details about the next option.

+** 'psize' is filled with option's size, 'notoalign' with its

+** alignment requirements.

+** Local variable 'size' gets the size to be aligned. (Kpadal option

+** always gets its full alignment, other options are limited by

+** the maximum alignment ('maxalign'). Kchar option needs no alignment

+** despite its size.

+*/

+static KOption getdetails (Header *h, size_t totalsize,

+                           const char **fmt, int *psize, int *ntoalign) {

+  KOption opt = getoption(h, fmt, psize);

+  int align = *psize;  /* usually, alignment follows size */

+  if (opt == Kpaddalign) {  /* 'X' gets alignment from following option */

+    if (**fmt == '\0' || getoption(h, fmt, &align) == Kchar || align == 0)

+      luaL_argerror(h->L, 1, "invalid next option for option 'X'");

+  }

+  if (align <= 1 || opt == Kchar)  /* need no alignment? */

+    *ntoalign = 0;

+  else {

+    if (align > h->maxalign)  /* enforce maximum alignment */

+      align = h->maxalign;

+    if ((align & (align - 1)) != 0)  /* is 'align' not a power of 2? */

+      luaL_argerror(h->L, 1, "format asks for alignment not power of 2");

+    *ntoalign = (align - (int)(totalsize & (align - 1))) & (align - 1);

+  }

+  return opt;

+}

+

+

+/*

+** Pack integer 'n' with 'size' bytes and 'islittle' endianness.

+** The final 'if' handles the case when 'size' is larger than

+** the size of a Lua integer, correcting the extra sign-extension

+** bytes if necessary (by default they would be zeros).

+*/

+static void packint (luaL_Buffer *b, lua_Unsigned n,

+                     int islittle, int size, int neg) {

+  char *buff = luaL_prepbuffsize(b, size);

+  int i;

+  buff[islittle ? 0 : size - 1] = (char)(n & MC);  /* first byte */

+  for (i = 1; i < size; i++) {

+    n >>= NB;

+    buff[islittle ? i : size - 1 - i] = (char)(n & MC);

+  }

+  if (neg && size > SZINT) {  /* negative number need sign extension? */

+    for (i = SZINT; i < size; i++)  /* correct extra bytes */

+      buff[islittle ? i : size - 1 - i] = (char)MC;

+  }

+  luaL_addsize(b, size);  /* add result to buffer */

+}

+

+

+/*

+** Copy 'size' bytes from 'src' to 'dest', correcting endianness if

+** given 'islittle' is different from native endianness.

+*/

+static void copywithendian (char *dest, const char *src,

+                            int size, int islittle) {

+  if (islittle == nativeendian.little)

+    memcpy(dest, src, size);

+  else {

+    dest += size - 1;

+    while (size-- != 0)

+      *(dest--) = *(src++);

+  }

+}

+

+

+static int str_pack (lua_State *L) {

+  luaL_Buffer b;

+  Header h;

+  const char *fmt = luaL_checkstring(L, 1);  /* format string */

+  int arg = 1;  /* current argument to pack */

+  size_t totalsize = 0;  /* accumulate total size of result */

+  initheader(L, &h);

+  lua_pushnil(L);  /* mark to separate arguments from string buffer */

+  luaL_buffinit(L, &b);

+  while (*fmt != '\0') {

+    int size, ntoalign;

+    KOption opt = getdetails(&h, totalsize, &fmt, &size, &ntoalign);

+    totalsize += ntoalign + size;

+    while (ntoalign-- > 0)

+     luaL_addchar(&b, LUAL_PACKPADBYTE);  /* fill alignment */

+    arg++;

+    switch (opt) {

+      case Kint: {  /* signed integers */

+        lua_Integer n = luaL_checkinteger(L, arg);

+        if (size < SZINT) {  /* need overflow check? */

+          lua_Integer lim = (lua_Integer)1 << ((size * NB) - 1);

+          luaL_argcheck(L, -lim <= n && n < lim, arg, "integer overflow");

+        }

+        packint(&b, (lua_Unsigned)n, h.islittle, size, (n < 0));

+        break;

+      }

+      case Kuint: {  /* unsigned integers */

+        lua_Integer n = luaL_checkinteger(L, arg);

+        if (size < SZINT)  /* need overflow check? */

+          luaL_argcheck(L, (lua_Unsigned)n < ((lua_Unsigned)1 << (size * NB)),

+                           arg, "unsigned overflow");

+        packint(&b, (lua_Unsigned)n, h.islittle, size, 0);

+        break;

+      }

+      case Kfloat: {  /* floating-point options */

+        Ftypes u;

+        char *buff = luaL_prepbuffsize(&b, size);

+        lua_Number n = luaL_checknumber(L, arg);  /* get argument */

+        if (size == sizeof(u.f)) u.f = (float)n;  /* copy it into 'u' */

+        else if (size == sizeof(u.d)) u.d = (double)n;

+        else u.n = n;

+        /* move 'u' to final result, correcting endianness if needed */

+        copywithendian(buff, (char *)&u, size, h.islittle);

+        luaL_addsize(&b, size);

+        break;

+      }

+      case Kchar: {  /* fixed-size string */

+        size_t len;

+        const char *s = luaL_checklstring(L, arg, &len);

+        luaL_argcheck(L, len <= (size_t)size, arg,

+                         "string longer than given size");

+        luaL_addlstring(&b, s, len);  /* add string */

+        while (len++ < (size_t)size)  /* pad extra space */

+          luaL_addchar(&b, LUAL_PACKPADBYTE);

+        break;

+      }

+      case Kstring: {  /* strings with length count */

+        size_t len;

+        const char *s = luaL_checklstring(L, arg, &len);

+        luaL_argcheck(L, size >= (int)sizeof(size_t) ||

+                         len < ((size_t)1 << (size * NB)),

+                         arg, "string length does not fit in given size");

+        packint(&b, (lua_Unsigned)len, h.islittle, size, 0);  /* pack length */

+        luaL_addlstring(&b, s, len);

+        totalsize += len;

+        break;

+      }

+      case Kzstr: {  /* zero-terminated string */

+        size_t len;

+        const char *s = luaL_checklstring(L, arg, &len);

+        luaL_argcheck(L, strlen(s) == len, arg, "string contains zeros");

+        luaL_addlstring(&b, s, len);

+        luaL_addchar(&b, '\0');  /* add zero at the end */

+        totalsize += len + 1;

+        break;

+      }

+      case Kpadding: luaL_addchar(&b, LUAL_PACKPADBYTE);  /* FALLTHROUGH */

+      case Kpaddalign: case Knop:

+        arg--;  /* undo increment */

+        break;

+    }

+  }

+  luaL_pushresult(&b);

+  return 1;

+}

+

+

+static int str_packsize (lua_State *L) {

+  Header h;

+  const char *fmt = luaL_checkstring(L, 1);  /* format string */

+  size_t totalsize = 0;  /* accumulate total size of result */

+  initheader(L, &h);

+  while (*fmt != '\0') {

+    int size, ntoalign;

+    KOption opt = getdetails(&h, totalsize, &fmt, &size, &ntoalign);

+    luaL_argcheck(L, opt != Kstring && opt != Kzstr, 1,

+                     "variable-length format");

+    size += ntoalign;  /* total space used by option */

+    luaL_argcheck(L, totalsize <= MAXSIZE - size, 1,

+                     "format result too large");

+    totalsize += size;

+  }

+  lua_pushinteger(L, (lua_Integer)totalsize);

+  return 1;

+}

+

+

+/*

+** Unpack an integer with 'size' bytes and 'islittle' endianness.

+** If size is smaller than the size of a Lua integer and integer

+** is signed, must do sign extension (propagating the sign to the

+** higher bits); if size is larger than the size of a Lua integer,

+** it must check the unread bytes to see whether they do not cause an

+** overflow.

+*/

+static lua_Integer unpackint (lua_State *L, const char *str,

+                              int islittle, int size, int issigned) {

+  lua_Unsigned res = 0;

+  int i;

+  int limit = (size  <= SZINT) ? size : SZINT;

+  for (i = limit - 1; i >= 0; i--) {

+    res <<= NB;

+    res |= (lua_Unsigned)(unsigned char)str[islittle ? i : size - 1 - i];

+  }

+  if (size < SZINT) {  /* real size smaller than lua_Integer? */

+    if (issigned) {  /* needs sign extension? */

+      lua_Unsigned mask = (lua_Unsigned)1 << (size*NB - 1);

+      res = ((res ^ mask) - mask);  /* do sign extension */

+    }

+  }

+  else if (size > SZINT) {  /* must check unread bytes */

+    int mask = (!issigned || (lua_Integer)res >= 0) ? 0 : MC;

+    for (i = limit; i < size; i++) {

+      if ((unsigned char)str[islittle ? i : size - 1 - i] != mask)

+        luaL_error(L, "%d-byte integer does not fit into Lua Integer", size);

+    }

+  }

+  return (lua_Integer)res;

+}

+

+

+static int str_unpack (lua_State *L) {

+  Header h;

+  const char *fmt = luaL_checkstring(L, 1);

+  size_t ld;

+  const char *data = luaL_checklstring(L, 2, &ld);

+  size_t pos = posrelatI(luaL_optinteger(L, 3, 1), ld) - 1;

+  int n = 0;  /* number of results */

+  luaL_argcheck(L, pos <= ld, 3, "initial position out of string");

+  initheader(L, &h);

+  while (*fmt != '\0') {

+    int size, ntoalign;

+    KOption opt = getdetails(&h, pos, &fmt, &size, &ntoalign);

+    luaL_argcheck(L, (size_t)ntoalign + size <= ld - pos, 2,

+                    "data string too short");

+    pos += ntoalign;  /* skip alignment */

+    /* stack space for item + next position */

+    luaL_checkstack(L, 2, "too many results");

+    n++;

+    switch (opt) {

+      case Kint:

+      case Kuint: {

+        lua_Integer res = unpackint(L, data + pos, h.islittle, size,

+                                       (opt == Kint));

+        lua_pushinteger(L, res);

+        break;

+      }

+      case Kfloat: {

+        Ftypes u;

+        lua_Number num;

+        copywithendian((char *)&u, data + pos, size, h.islittle);

+        if (size == sizeof(u.f)) num = (lua_Number)u.f;

+        else if (size == sizeof(u.d)) num = (lua_Number)u.d;

+        else num = u.n;

+        lua_pushnumber(L, num);

+        break;

+      }

+      case Kchar: {

+        lua_pushlstring(L, data + pos, size);

+        break;

+      }

+      case Kstring: {

+        size_t len = (size_t)unpackint(L, data + pos, h.islittle, size, 0);

+        luaL_argcheck(L, len <= ld - pos - size, 2, "data string too short");

+        lua_pushlstring(L, data + pos + size, len);

+        pos += len;  /* skip string */

+        break;

+      }

+      case Kzstr: {

+        size_t len = strlen(data + pos);

+        luaL_argcheck(L, pos + len < ld, 2,

+                         "unfinished string for format 'z'");

+        lua_pushlstring(L, data + pos, len);

+        pos += len + 1;  /* skip string plus final '\0' */

+        break;

+      }

+      case Kpaddalign: case Kpadding: case Knop:

+        n--;  /* undo increment */

+        break;

+    }

+    pos += size;

+  }

+  lua_pushinteger(L, pos + 1);  /* next position */

+  return n + 1;

+}

+

+/* }====================================================== */

+

+

+static const luaL_Reg strlib[] = {

+  {"byte", str_byte},

+  {"char", str_char},

+  {"dump", str_dump},

+  {"find", str_find},

+  {"format", str_format},

+  {"gmatch", gmatch},

+  {"gsub", str_gsub},

+  {"len", str_len},

+  {"lower", str_lower},

+  {"match", str_match},

+  {"rep", str_rep},

+  {"reverse", str_reverse},

+  {"sub", str_sub},

+  {"upper", str_upper},

+  {"pack", str_pack},

+  {"packsize", str_packsize},

+  {"unpack", str_unpack},

+  {NULL, NULL}

+};

+

+

+static void createmetatable (lua_State *L) {

+  /* table to be metatable for strings */

+  luaL_newlibtable(L, stringmetamethods);

+  luaL_setfuncs(L, stringmetamethods, 0);

+  lua_pushliteral(L, "");  /* dummy string */

+  lua_pushvalue(L, -2);  /* copy table */

+  lua_setmetatable(L, -2);  /* set table as metatable for strings */

+  lua_pop(L, 1);  /* pop dummy string */

+  lua_pushvalue(L, -2);  /* get string library */

+  lua_setfield(L, -2, "__index");  /* metatable.__index = string */

+  lua_pop(L, 1);  /* pop metatable */

+}

+

+

+/*

+** Open string library

+*/

+LUAMOD_API int luaopen_string (lua_State *L) {

+  luaL_newlib(L, strlib);

+  createmetatable(L);

+  return 1;

+}

+

--- /dev/null

+++ b/ltable.c

@@ -1,0 +1,938 @@

+/*

+** $Id: ltable.c $

+** Lua tables (hash)

+** See Copyright Notice in lua.h

+*/

+

+#define ltable_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+/*

+** Implementation of tables (aka arrays, objects, or hash tables).

+** Tables keep its elements in two parts: an array part and a hash part.

+** Non-negative integer keys are all candidates to be kept in the array

+** part. The actual size of the array is the largest 'n' such that

+** more than half the slots between 1 and n are in use.

+** Hash uses a mix of chained scatter table with Brent's variation.

+** A main invariant of these tables is that, if an element is not

+** in its main position (i.e. the 'original' position that its hash gives

+** to it), then the colliding element is in its own main position.

+** Hence even when the load factor reaches 100%, performance remains good.

+*/

+

+#include <math.h>

+#include <limits.h>

+

+#include "lua.h"

+

+#include "ldebug.h"

+#include "ldo.h"

+#include "lgc.h"

+#include "lmem.h"

+#include "lobject.h"

+#include "lstate.h"

+#include "lstring.h"

+#include "ltable.h"

+#include "lvm.h"

+

+

+/*

+** MAXABITS is the largest integer such that MAXASIZE fits in an

+** unsigned int.

+*/

+#define MAXABITS	cast_int(sizeof(int) * CHAR_BIT - 1)

+

+

+/*

+** MAXASIZE is the maximum size of the array part. It is the minimum

+** between 2^MAXABITS and the maximum size that, measured in bytes,

+** fits in a 'size_t'.

+*/

+#define MAXASIZE	luaM_limitN(1u << MAXABITS, TValue)

+

+/*

+** MAXHBITS is the largest integer such that 2^MAXHBITS fits in a

+** signed int.

+*/

+#define MAXHBITS	(MAXABITS - 1)

+

+

+/*

+** MAXHSIZE is the maximum size of the hash part. It is the minimum

+** between 2^MAXHBITS and the maximum size such that, measured in bytes,

+** it fits in a 'size_t'.

+*/

+#define MAXHSIZE	luaM_limitN(1u << MAXHBITS, Node)

+

+

+#define hashpow2(t,n)		(gnode(t, lmod((n), sizenode(t))))

+

+#define hashstr(t,str)		hashpow2(t, (str)->hash)

+#define hashboolean(t,p)	hashpow2(t, p)

+#define hashint(t,i)		hashpow2(t, i)

+

+

+/*

+** for some types, it is better to avoid modulus by power of 2, as

+** they tend to have many 2 factors.

+*/

+#define hashmod(t,n)	(gnode(t, ((n) % ((sizenode(t)-1)|1))))

+

+

+#define hashpointer(t,p)	hashmod(t, point2uint(p))

+

+

+#define dummynode		(&dummynode_)

+

+static const Node dummynode_ = {

+  {{NULL}, LUA_VEMPTY,  /* value's value and type */

+   LUA_VNIL, 0, {NULL}}  /* key type, next, and key value */

+};

+

+

+static const TValue absentkey = {ABSTKEYCONSTANT};

+

+

+

+/*

+** Hash for floating-point numbers.

+** The main computation should be just

+**     n = frexp(n, &i); return (n * INT_MAX) + i

+** but there are some numerical subtleties.

+** In a two-complement representation, INT_MAX does not has an exact

+** representation as a float, but INT_MIN does; because the absolute

+** value of 'frexp' is smaller than 1 (unless 'n' is inf/NaN), the

+** absolute value of the product 'frexp * -INT_MIN' is smaller or equal

+** to INT_MAX. Next, the use of 'unsigned int' avoids overflows when

+** adding 'i'; the use of '~u' (instead of '-u') avoids problems with

+** INT_MIN.

+*/

+#if !defined(l_hashfloat)

+static int l_hashfloat (lua_Number n) {

+  int i;

+  lua_Integer ni;

+  n = l_mathop(frexp)(n, &i) * -cast_num(INT_MIN);

+  if (!lua_numbertointeger(n, &ni)) {  /* is 'n' inf/-inf/NaN? */

+    lua_assert(luai_numisnan(n) || l_mathop(fabs)(n) == cast_num(HUGE_VAL));

+    return 0;

+  }

+  else {  /* normal case */

+    unsigned int u = cast_uint(i) + cast_uint(ni);

+    return cast_int(u <= cast_uint(INT_MAX) ? u : ~u);

+  }

+}

+#endif

+

+

+/*

+** returns the 'main' position of an element in a table (that is,

+** the index of its hash value). The key comes broken (tag in 'ktt'

+** and value in 'vkl') so that we can call it on keys inserted into

+** nodes.

+*/

+static Node *mainposition (const Table *t, int ktt, const Value *kvl) {

+  switch (withvariant(ktt)) {

+    case LUA_VNUMINT:

+      return hashint(t, ivalueraw(*kvl));

+    case LUA_VNUMFLT:

+      return hashmod(t, l_hashfloat(fltvalueraw(*kvl)));

+    case LUA_VSHRSTR:

+      return hashstr(t, tsvalueraw(*kvl));

+    case LUA_VLNGSTR:

+      return hashpow2(t, luaS_hashlongstr(tsvalueraw(*kvl)));

+    case LUA_VFALSE:

+      return hashboolean(t, 0);

+    case LUA_VTRUE:

+      return hashboolean(t, 1);

+    case LUA_VLIGHTUSERDATA:

+      return hashpointer(t, pvalueraw(*kvl));

+    case LUA_VLCF:

+      return hashpointer(t, fvalueraw(*kvl));

+    default:

+      return hashpointer(t, gcvalueraw(*kvl));

+  }

+}

+

+

+/*

+** Returns the main position of an element given as a 'TValue'

+*/

+static Node *mainpositionTV (const Table *t, const TValue *key) {

+  return mainposition(t, rawtt(key), valraw(key));

+}

+

+

+/*

+** Check whether key 'k1' is equal to the key in node 'n2'. This

+** equality is raw, so there are no metamethods. Floats with integer

+** values have been normalized, so integers cannot be equal to

+** floats. It is assumed that 'eqshrstr' is simply pointer equality, so

+** that short strings are handled in the default case.

+** A true 'deadok' means to accept dead keys as equal to their original

+** values. All dead keys are compared in the default case, by pointer

+** identity. (Only collectable objects can produce dead keys.) Note that

+** dead long strings are also compared by identity.

+** Once a key is dead, its corresponding value may be collected, and

+** then another value can be created with the same address. If this

+** other value is given to 'next', 'equalkey' will signal a false

+** positive. In a regular traversal, this situation should never happen,

+** as all keys given to 'next' came from the table itself, and therefore

+** could not have been collected. Outside a regular traversal, we

+** have garbage in, garbage out. What is relevant is that this false

+** positive does not break anything.  (In particular, 'next' will return

+** some other valid item on the table or nil.)

+*/

+static int equalkey (const TValue *k1, const Node *n2, int deadok) {

+  if ((rawtt(k1) != keytt(n2)) &&  /* not the same variants? */

+       !(deadok && keyisdead(n2) && iscollectable(k1)))

+   return 0;  /* cannot be same key */

+  switch (keytt(n2)) {

+    case LUA_VNIL: case LUA_VFALSE: case LUA_VTRUE:

+      return 1;

+    case LUA_VNUMINT:

+      return (ivalue(k1) == keyival(n2));

+    case LUA_VNUMFLT:

+      return luai_numeq(fltvalue(k1), fltvalueraw(keyval(n2)));

+    case LUA_VLIGHTUSERDATA:

+      return pvalue(k1) == pvalueraw(keyval(n2));

+    case LUA_VLCF:

+      return fvalue(k1) == fvalueraw(keyval(n2));

+    case ctb(LUA_VLNGSTR):

+      return luaS_eqlngstr(tsvalue(k1), keystrval(n2));

+    default:

+      return gcvalue(k1) == gcvalueraw(keyval(n2));

+  }

+}

+

+

+/*

+** True if value of 'alimit' is equal to the real size of the array

+** part of table 't'. (Otherwise, the array part must be larger than

+** 'alimit'.)

+*/

+#define limitequalsasize(t)	(isrealasize(t) || ispow2((t)->alimit))

+

+

+/*

+** Returns the real size of the 'array' array

+*/

+LUAI_FUNC unsigned int luaH_realasize (const Table *t) {

+  if (limitequalsasize(t))

+    return t->alimit;  /* this is the size */

+  else {

+    unsigned int size = t->alimit;

+    /* compute the smallest power of 2 not smaller than 'n' */

+    size |= (size >> 1);

+    size |= (size >> 2);

+    size |= (size >> 4);

+    size |= (size >> 8);

+    size |= (size >> 16);

+#if (UINT_MAX >> 30) > 3

+    size |= (size >> 32);  /* unsigned int has more than 32 bits */

+#endif

+    size++;

+    lua_assert(ispow2(size) && size/2 < t->alimit && t->alimit < size);

+    return size;

+  }

+}

+

+

+/*

+** Check whether real size of the array is a power of 2.

+** (If it is not, 'alimit' cannot be changed to any other value

+** without changing the real size.)

+*/

+static int ispow2realasize (const Table *t) {

+  return (!isrealasize(t) || ispow2(t->alimit));

+}

+

+

+static unsigned int setlimittosize (Table *t) {

+  t->alimit = luaH_realasize(t);

+  setrealasize(t);

+  return t->alimit;

+}

+

+

+#define limitasasize(t)	check_exp(isrealasize(t), t->alimit)

+

+

+

+/*

+** "Generic" get version. (Not that generic: not valid for integers,

+** which may be in array part, nor for floats with integral values.)

+** See explanation about 'deadok' in function 'equalkey'.

+*/

+static const TValue *getgeneric (Table *t, const TValue *key, int deadok) {

+  Node *n = mainpositionTV(t, key);

+  for (;;) {  /* check whether 'key' is somewhere in the chain */

+    if (equalkey(key, n, deadok))

+      return gval(n);  /* that's it */

+    else {

+      int nx = gnext(n);

+      if (nx == 0)

+        return &absentkey;  /* not found */

+      n += nx;

+    }

+  }

+}

+

+

+/*

+** returns the index for 'k' if 'k' is an appropriate key to live in

+** the array part of a table, 0 otherwise.

+*/

+static unsigned int arrayindex (lua_Integer k) {

+  if (l_castS2U(k) - 1u < MAXASIZE)  /* 'k' in [1, MAXASIZE]? */

+    return cast_uint(k);  /* 'key' is an appropriate array index */

+  else

+    return 0;

+}

+

+

+/*

+** returns the index of a 'key' for table traversals. First goes all

+** elements in the array part, then elements in the hash part. The

+** beginning of a traversal is signaled by 0.

+*/

+static unsigned int findindex (lua_State *L, Table *t, TValue *key,

+                               unsigned int asize) {

+  unsigned int i;

+  if (ttisnil(key)) return 0;  /* first iteration */

+  i = ttisinteger(key) ? arrayindex(ivalue(key)) : 0;

+  if (i - 1u < asize)  /* is 'key' inside array part? */

+    return i;  /* yes; that's the index */

+  else {

+    const TValue *n = getgeneric(t, key, 1);

+    if (unlikely(isabstkey(n)))

+      luaG_runerror(L, "invalid key to 'next'");  /* key not found */

+    i = cast_int(nodefromval(n) - gnode(t, 0));  /* key index in hash table */

+    /* hash elements are numbered after array ones */

+    return (i + 1) + asize;

+  }

+}

+

+

+int luaH_next (lua_State *L, Table *t, StkId key) {

+  unsigned int asize = luaH_realasize(t);

+  unsigned int i = findindex(L, t, s2v(key), asize);  /* find original key */

+  for (; i < asize; i++) {  /* try first array part */

+    if (!isempty(&t->array[i])) {  /* a non-empty entry? */

+      setivalue(s2v(key), i + 1);

+      setobj2s(L, key + 1, &t->array[i]);

+      return 1;

+    }

+  }

+  for (i -= asize; cast_int(i) < sizenode(t); i++) {  /* hash part */

+    if (!isempty(gval(gnode(t, i)))) {  /* a non-empty entry? */

+      Node *n = gnode(t, i);

+      getnodekey(L, s2v(key), n);

+      setobj2s(L, key + 1, gval(n));

+      return 1;

+    }

+  }

+  return 0;  /* no more elements */

+}

+

+

+static void freehash (lua_State *L, Table *t) {

+  if (!isdummy(t))

+    luaM_freearray(L, t->node, cast_sizet(sizenode(t)));

+}

+

+

+/*

+** {=============================================================

+** Rehash

+** ==============================================================

+*/

+

+/*

+** Compute the optimal size for the array part of table 't'. 'nums' is a

+** "count array" where 'nums[i]' is the number of integers in the table

+** between 2^(i - 1) + 1 and 2^i. 'pna' enters with the total number of

+** integer keys in the table and leaves with the number of keys that

+** will go to the array part; return the optimal size.  (The condition

+** 'twotoi > 0' in the for loop stops the loop if 'twotoi' overflows.)

+*/

+static unsigned int computesizes (unsigned int nums[], unsigned int *pna) {

+  int i;

+  unsigned int twotoi;  /* 2^i (candidate for optimal size) */

+  unsigned int a = 0;  /* number of elements smaller than 2^i */

+  unsigned int na = 0;  /* number of elements to go to array part */

+  unsigned int optimal = 0;  /* optimal size for array part */

+  /* loop while keys can fill more than half of total size */

+  for (i = 0, twotoi = 1;

+       twotoi > 0 && *pna > twotoi / 2;

+       i++, twotoi *= 2) {

+    a += nums[i];

+    if (a > twotoi/2) {  /* more than half elements present? */

+      optimal = twotoi;  /* optimal size (till now) */

+      na = a;  /* all elements up to 'optimal' will go to array part */

+    }

+  }

+  lua_assert((optimal == 0 || optimal / 2 < na) && na <= optimal);

+  *pna = na;

+  return optimal;

+}

+

+

+static int countint (lua_Integer key, unsigned int *nums) {

+  unsigned int k = arrayindex(key);

+  if (k != 0) {  /* is 'key' an appropriate array index? */

+    nums[luaO_ceillog2(k)]++;  /* count as such */

+    return 1;

+  }

+  else

+    return 0;

+}

+

+

+/*

+** Count keys in array part of table 't': Fill 'nums[i]' with

+** number of keys that will go into corresponding slice and return

+** total number of non-nil keys.

+*/

+static unsigned int numusearray (const Table *t, unsigned int *nums) {

+  int lg;

+  unsigned int ttlg;  /* 2^lg */

+  unsigned int ause = 0;  /* summation of 'nums' */

+  unsigned int i = 1;  /* count to traverse all array keys */

+  unsigned int asize = limitasasize(t);  /* real array size */

+  /* traverse each slice */

+  for (lg = 0, ttlg = 1; lg <= MAXABITS; lg++, ttlg *= 2) {

+    unsigned int lc = 0;  /* counter */

+    unsigned int lim = ttlg;

+    if (lim > asize) {

+      lim = asize;  /* adjust upper limit */

+      if (i > lim)

+        break;  /* no more elements to count */

+    }

+    /* count elements in range (2^(lg - 1), 2^lg] */

+    for (; i <= lim; i++) {

+      if (!isempty(&t->array[i-1]))

+        lc++;

+    }

+    nums[lg] += lc;

+    ause += lc;

+  }

+  return ause;

+}

+

+

+static int numusehash (const Table *t, unsigned int *nums, unsigned int *pna) {

+  int totaluse = 0;  /* total number of elements */

+  int ause = 0;  /* elements added to 'nums' (can go to array part) */

+  int i = sizenode(t);

+  while (i--) {

+    Node *n = &t->node[i];

+    if (!isempty(gval(n))) {

+      if (keyisinteger(n))

+        ause += countint(keyival(n), nums);

+      totaluse++;

+    }

+  }

+  *pna += ause;

+  return totaluse;

+}

+

+

+/*

+** Creates an array for the hash part of a table with the given

+** size, or reuses the dummy node if size is zero.

+** The computation for size overflow is in two steps: the first

+** comparison ensures that the shift in the second one does not

+** overflow.

+*/

+static void setnodevector (lua_State *L, Table *t, unsigned int size) {

+  if (size == 0) {  /* no elements to hash part? */

+    t->node = cast(Node *, dummynode);  /* use common 'dummynode' */

+    t->lsizenode = 0;

+    t->lastfree = NULL;  /* signal that it is using dummy node */

+  }

+  else {

+    int i;

+    int lsize = luaO_ceillog2(size);

+    if (lsize > MAXHBITS || (1u << lsize) > MAXHSIZE)

+      luaG_runerror(L, "table overflow");

+    size = twoto(lsize);

+    t->node = luaM_newvector(L, size, Node);

+    for (i = 0; i < (int)size; i++) {

+      Node *n = gnode(t, i);

+      gnext(n) = 0;

+      setnilkey(n);

+      setempty(gval(n));

+    }

+    t->lsizenode = cast_byte(lsize);

+    t->lastfree = gnode(t, size);  /* all positions are free */

+  }

+}

+

+

+/*

+** (Re)insert all elements from the hash part of 'ot' into table 't'.

+*/

+static void reinsert (lua_State *L, Table *ot, Table *t) {

+  int j;

+  int size = sizenode(ot);

+  for (j = 0; j < size; j++) {

+    Node *old = gnode(ot, j);

+    if (!isempty(gval(old))) {

+      /* doesn't need barrier/invalidate cache, as entry was

+         already present in the table */

+      TValue k;

+      getnodekey(L, &k, old);

+      setobjt2t(L, luaH_set(L, t, &k), gval(old));

+    }

+  }

+}

+

+

+/*

+** Exchange the hash part of 't1' and 't2'.

+*/

+static void exchangehashpart (Table *t1, Table *t2) {

+  lu_byte lsizenode = t1->lsizenode;

+  Node *node = t1->node;

+  Node *lastfree = t1->lastfree;

+  t1->lsizenode = t2->lsizenode;

+  t1->node = t2->node;

+  t1->lastfree = t2->lastfree;

+  t2->lsizenode = lsizenode;

+  t2->node = node;

+  t2->lastfree = lastfree;

+}

+

+

+/*

+** Resize table 't' for the new given sizes. Both allocations (for

+** the hash part and for the array part) can fail, which creates some

+** subtleties. If the first allocation, for the hash part, fails, an

+** error is raised and that is it. Otherwise, it copies the elements from

+** the shrinking part of the array (if it is shrinking) into the new

+** hash. Then it reallocates the array part.  If that fails, the table

+** is in its original state; the function frees the new hash part and then

+** raises the allocation error. Otherwise, it sets the new hash part

+** into the table, initializes the new part of the array (if any) with

+** nils and reinserts the elements of the old hash back into the new

+** parts of the table.

+*/

+void luaH_resize (lua_State *L, Table *t, unsigned int newasize,

+                                          unsigned int nhsize) {

+  unsigned int i;

+  Table newt;  /* to keep the new hash part */

+  unsigned int oldasize = setlimittosize(t);

+  TValue *newarray;

+  /* create new hash part with appropriate size into 'newt' */

+  setnodevector(L, &newt, nhsize);

+  if (newasize < oldasize) {  /* will array shrink? */

+    t->alimit = newasize;  /* pretend array has new size... */

+    exchangehashpart(t, &newt);  /* and new hash */

+    /* re-insert into the new hash the elements from vanishing slice */

+    for (i = newasize; i < oldasize; i++) {

+      if (!isempty(&t->array[i]))

+        luaH_setint(L, t, i + 1, &t->array[i]);

+    }

+    t->alimit = oldasize;  /* restore current size... */

+    exchangehashpart(t, &newt);  /* and hash (in case of errors) */

+  }

+  /* allocate new array */

+  newarray = luaM_reallocvector(L, t->array, oldasize, newasize, TValue);

+  if (unlikely(newarray == NULL && newasize > 0)) {  /* allocation failed? */

+    freehash(L, &newt);  /* release new hash part */

+    luaM_error(L);  /* raise error (with array unchanged) */

+  }

+  /* allocation ok; initialize new part of the array */

+  exchangehashpart(t, &newt);  /* 't' has the new hash ('newt' has the old) */

+  t->array = newarray;  /* set new array part */

+  t->alimit = newasize;

+  for (i = oldasize; i < newasize; i++)  /* clear new slice of the array */

+     setempty(&t->array[i]);

+  /* re-insert elements from old hash part into new parts */

+  reinsert(L, &newt, t);  /* 'newt' now has the old hash */

+  freehash(L, &newt);  /* free old hash part */

+}

+

+

+void luaH_resizearray (lua_State *L, Table *t, unsigned int nasize) {

+  int nsize = allocsizenode(t);

+  luaH_resize(L, t, nasize, nsize);

+}

+

+/*

+** nums[i] = number of keys 'k' where 2^(i - 1) < k <= 2^i

+*/

+static void rehash (lua_State *L, Table *t, const TValue *ek) {

+  unsigned int asize;  /* optimal size for array part */

+  unsigned int na;  /* number of keys in the array part */

+  unsigned int nums[MAXABITS + 1];

+  int i;

+  int totaluse;

+  for (i = 0; i <= MAXABITS; i++) nums[i] = 0;  /* reset counts */

+  setlimittosize(t);

+  na = numusearray(t, nums);  /* count keys in array part */

+  totaluse = na;  /* all those keys are integer keys */

+  totaluse += numusehash(t, nums, &na);  /* count keys in hash part */

+  /* count extra key */

+  if (ttisinteger(ek))

+    na += countint(ivalue(ek), nums);

+  totaluse++;

+  /* compute new size for array part */

+  asize = computesizes(nums, &na);

+  /* resize the table to new computed sizes */

+  luaH_resize(L, t, asize, totaluse - na);

+}

+

+

+

+/*

+** }=============================================================

+*/

+

+

+Table *luaH_new (lua_State *L) {

+  GCObject *o = luaC_newobj(L, LUA_VTABLE, sizeof(Table));

+  Table *t = gco2t(o);

+  t->metatable = NULL;

+  t->flags = cast_byte(maskflags);  /* table has no metamethod fields */

+  t->array = NULL;

+  t->alimit = 0;

+  setnodevector(L, t, 0);

+  return t;

+}

+

+

+void luaH_free (lua_State *L, Table *t) {

+  freehash(L, t);

+  luaM_freearray(L, t->array, luaH_realasize(t));

+  luaM_free(L, t);

+}

+

+

+static Node *getfreepos (Table *t) {

+  if (!isdummy(t)) {

+    while (t->lastfree > t->node) {

+      t->lastfree--;

+      if (keyisnil(t->lastfree))

+        return t->lastfree;

+    }

+  }

+  return NULL;  /* could not find a free place */

+}

+

+

+

+/*

+** inserts a new key into a hash table; first, check whether key's main

+** position is free. If not, check whether colliding node is in its main

+** position or not: if it is not, move colliding node to an empty place and

+** put new key in its main position; otherwise (colliding node is in its main

+** position), new key goes to an empty position.

+*/

+TValue *luaH_newkey (lua_State *L, Table *t, const TValue *key) {

+  Node *mp;

+  TValue aux;

+  if (unlikely(ttisnil(key)))

+    luaG_runerror(L, "table index is nil");

+  else if (ttisfloat(key)) {

+    lua_Number f = fltvalue(key);

+    lua_Integer k;

+    if (luaV_flttointeger(f, &k, F2Ieq)) {  /* does key fit in an integer? */

+      setivalue(&aux, k);

+      key = &aux;  /* insert it as an integer */

+    }

+    else if (unlikely(luai_numisnan(f)))

+      luaG_runerror(L, "table index is NaN");

+  }

+  mp = mainpositionTV(t, key);

+  if (!isempty(gval(mp)) || isdummy(t)) {  /* main position is taken? */

+    Node *othern;

+    Node *f = getfreepos(t);  /* get a free place */

+    if (f == NULL) {  /* cannot find a free place? */

+      rehash(L, t, key);  /* grow table */

+      /* whatever called 'newkey' takes care of TM cache */

+      return luaH_set(L, t, key);  /* insert key into grown table */

+    }

+    lua_assert(!isdummy(t));

+    othern = mainposition(t, keytt(mp), &keyval(mp));

+    if (othern != mp) {  /* is colliding node out of its main position? */

+      /* yes; move colliding node into free position */

+      while (othern + gnext(othern) != mp)  /* find previous */

+        othern += gnext(othern);

+      gnext(othern) = cast_int(f - othern);  /* rechain to point to 'f' */

+      *f = *mp;  /* copy colliding node into free pos. (mp->next also goes) */

+      if (gnext(mp) != 0) {

+        gnext(f) += cast_int(mp - f);  /* correct 'next' */

+        gnext(mp) = 0;  /* now 'mp' is free */

+      }

+      setempty(gval(mp));

+    }

+    else {  /* colliding node is in its own main position */

+      /* new node will go into free position */

+      if (gnext(mp) != 0)

+        gnext(f) = cast_int((mp + gnext(mp)) - f);  /* chain new position */

+      else lua_assert(gnext(f) == 0);

+      gnext(mp) = cast_int(f - mp);

+      mp = f;

+    }

+  }

+  setnodekey(L, mp, key);

+  luaC_barrierback(L, obj2gco(t), key);

+  lua_assert(isempty(gval(mp)));

+  return gval(mp);

+}

+

+

+/*

+** Search function for integers. If integer is inside 'alimit', get it

+** directly from the array part. Otherwise, if 'alimit' is not equal to

+** the real size of the array, key still can be in the array part. In

+** this case, try to avoid a call to 'luaH_realasize' when key is just

+** one more than the limit (so that it can be incremented without

+** changing the real size of the array).

+*/

+const TValue *luaH_getint (Table *t, lua_Integer key) {

+  if (l_castS2U(key) - 1u < t->alimit)  /* 'key' in [1, t->alimit]? */

+    return &t->array[key - 1];

+  else if (!limitequalsasize(t) &&  /* key still may be in the array part? */

+           (l_castS2U(key) == t->alimit + 1 ||

+            l_castS2U(key) - 1u < luaH_realasize(t))) {

+    t->alimit = cast_uint(key);  /* probably '#t' is here now */

+    return &t->array[key - 1];

+  }

+  else {

+    Node *n = hashint(t, key);

+    for (;;) {  /* check whether 'key' is somewhere in the chain */

+      if (keyisinteger(n) && keyival(n) == key)

+        return gval(n);  /* that's it */

+      else {

+        int nx = gnext(n);

+        if (nx == 0) break;

+        n += nx;

+      }

+    }

+    return &absentkey;

+  }

+}

+

+

+/*

+** search function for short strings

+*/

+const TValue *luaH_getshortstr (Table *t, TString *key) {

+  Node *n = hashstr(t, key);

+  lua_assert(key->tt == LUA_VSHRSTR);

+  for (;;) {  /* check whether 'key' is somewhere in the chain */

+    if (keyisshrstr(n) && eqshrstr(keystrval(n), key))

+      return gval(n);  /* that's it */

+    else {

+      int nx = gnext(n);

+      if (nx == 0)

+        return &absentkey;  /* not found */

+      n += nx;

+    }

+  }

+}

+

+

+const TValue *luaH_getstr (Table *t, TString *key) {

+  if (key->tt == LUA_VSHRSTR)

+    return luaH_getshortstr(t, key);

+  else {  /* for long strings, use generic case */

+    TValue ko;

+    setsvalue(cast(lua_State *, NULL), &ko, key);

+    return getgeneric(t, &ko, 0);

+  }

+}

+

+

+/*

+** main search function

+*/

+const TValue *luaH_get (Table *t, const TValue *key) {

+  switch (ttypetag(key)) {

+    case LUA_VSHRSTR: return luaH_getshortstr(t, tsvalue(key));

+    case LUA_VNUMINT: return luaH_getint(t, ivalue(key));

+    case LUA_VNIL: return &absentkey;

+    case LUA_VNUMFLT: {

+      lua_Integer k;

+      if (luaV_flttointeger(fltvalue(key), &k, F2Ieq)) /* integral index? */

+        return luaH_getint(t, k);  /* use specialized version */

+      /* else... */

+    }  /* FALLTHROUGH */

+    default:

+      return getgeneric(t, key, 0);

+  }

+}

+

+

+/*

+** beware: when using this function you probably need to check a GC

+** barrier and invalidate the TM cache.

+*/

+TValue *luaH_set (lua_State *L, Table *t, const TValue *key) {

+  const TValue *p = luaH_get(t, key);

+  if (!isabstkey(p))

+    return cast(TValue *, p);

+  else return luaH_newkey(L, t, key);

+}

+

+

+void luaH_setint (lua_State *L, Table *t, lua_Integer key, TValue *value) {

+  const TValue *p = luaH_getint(t, key);

+  TValue *cell;

+  if (!isabstkey(p))

+    cell = cast(TValue *, p);

+  else {

+    TValue k;

+    setivalue(&k, key);

+    cell = luaH_newkey(L, t, &k);

+  }

+  setobj2t(L, cell, value);

+}

+

+

+/*

+** Try to find a boundary in the hash part of table 't'. From the

+** caller, we know that 'j' is zero or present and that 'j + 1' is

+** present. We want to find a larger key that is absent from the

+** table, so that we can do a binary search between the two keys to

+** find a boundary. We keep doubling 'j' until we get an absent index.

+** If the doubling would overflow, we try LUA_MAXINTEGER. If it is

+** absent, we are ready for the binary search. ('j', being max integer,

+** is larger or equal to 'i', but it cannot be equal because it is

+** absent while 'i' is present; so 'j > i'.) Otherwise, 'j' is a

+** boundary. ('j + 1' cannot be a present integer key because it is

+** not a valid integer in Lua.)

+*/

+static lua_Unsigned hash_search (Table *t, lua_Unsigned j) {

+  lua_Unsigned i;

+  if (j == 0) j++;  /* the caller ensures 'j + 1' is present */

+  do {

+    i = j;  /* 'i' is a present index */

+    if (j <= l_castS2U(LUA_MAXINTEGER) / 2)

+      j *= 2;

+    else {

+      j = LUA_MAXINTEGER;

+      if (isempty(luaH_getint(t, j)))  /* t[j] not present? */

+        break;  /* 'j' now is an absent index */

+      else  /* weird case */

+        return j;  /* well, max integer is a boundary... */

+    }

+  } while (!isempty(luaH_getint(t, j)));  /* repeat until an absent t[j] */

+  /* i < j  &&  t[i] present  &&  t[j] absent */

+  while (j - i > 1u) {  /* do a binary search between them */

+    lua_Unsigned m = (i + j) / 2;

+    if (isempty(luaH_getint(t, m))) j = m;

+    else i = m;

+  }

+  return i;

+}

+

+

+static unsigned int binsearch (const TValue *array, unsigned int i,

+                                                    unsigned int j) {

+  while (j - i > 1u) {  /* binary search */

+    unsigned int m = (i + j) / 2;

+    if (isempty(&array[m - 1])) j = m;

+    else i = m;

+  }

+  return i;

+}

+

+

+/*

+** Try to find a boundary in table 't'. (A 'boundary' is an integer index

+** such that t[i] is present and t[i+1] is absent, or 0 if t[1] is absent

+** and 'maxinteger' if t[maxinteger] is present.)

+** (In the next explanation, we use Lua indices, that is, with base 1.

+** The code itself uses base 0 when indexing the array part of the table.)

+** The code starts with 'limit = t->alimit', a position in the array

+** part that may be a boundary.

+**

+** (1) If 't[limit]' is empty, there must be a boundary before it.

+** As a common case (e.g., after 't[#t]=nil'), check whether 'limit-1'

+** is present. If so, it is a boundary. Otherwise, do a binary search

+** between 0 and limit to find a boundary. In both cases, try to

+** use this boundary as the new 'alimit', as a hint for the next call.

+**

+** (2) If 't[limit]' is not empty and the array has more elements

+** after 'limit', try to find a boundary there. Again, try first

+** the special case (which should be quite frequent) where 'limit+1'

+** is empty, so that 'limit' is a boundary. Otherwise, check the

+** last element of the array part. If it is empty, there must be a

+** boundary between the old limit (present) and the last element

+** (absent), which is found with a binary search. (This boundary always

+** can be a new limit.)

+**

+** (3) The last case is when there are no elements in the array part

+** (limit == 0) or its last element (the new limit) is present.

+** In this case, must check the hash part. If there is no hash part

+** or 'limit+1' is absent, 'limit' is a boundary.  Otherwise, call

+** 'hash_search' to find a boundary in the hash part of the table.

+** (In those cases, the boundary is not inside the array part, and

+** therefore cannot be used as a new limit.)

+*/

+lua_Unsigned luaH_getn (Table *t) {

+  unsigned int limit = t->alimit;

+  if (limit > 0 && isempty(&t->array[limit - 1])) {  /* (1)? */

+    /* there must be a boundary before 'limit' */

+    if (limit >= 2 && !isempty(&t->array[limit - 2])) {

+      /* 'limit - 1' is a boundary; can it be a new limit? */

+      if (ispow2realasize(t) && !ispow2(limit - 1)) {

+        t->alimit = limit - 1;

+        setnorealasize(t);  /* now 'alimit' is not the real size */

+      }

+      return limit - 1;

+    }

+    else {  /* must search for a boundary in [0, limit] */

+      unsigned int boundary = binsearch(t->array, 0, limit);

+      /* can this boundary represent the real size of the array? */

+      if (ispow2realasize(t) && boundary > luaH_realasize(t) / 2) {

+        t->alimit = boundary;  /* use it as the new limit */

+        setnorealasize(t);

+      }

+      return boundary;

+    }

+  }

+  /* 'limit' is zero or present in table */

+  if (!limitequalsasize(t)) {  /* (2)? */

+    /* 'limit' > 0 and array has more elements after 'limit' */

+    if (isempty(&t->array[limit]))  /* 'limit + 1' is empty? */

+      return limit;  /* this is the boundary */

+    /* else, try last element in the array */

+    limit = luaH_realasize(t);

+    if (isempty(&t->array[limit - 1])) {  /* empty? */

+      /* there must be a boundary in the array after old limit,

+         and it must be a valid new limit */

+      unsigned int boundary = binsearch(t->array, t->alimit, limit);

+      t->alimit = boundary;

+      return boundary;

+    }

+    /* else, new limit is present in the table; check the hash part */

+  }

+  /* (3) 'limit' is the last element and either is zero or present in table */

+  lua_assert(limit == luaH_realasize(t) &&

+             (limit == 0 || !isempty(&t->array[limit - 1])));

+  if (isdummy(t) || isempty(luaH_getint(t, cast(lua_Integer, limit + 1))))

+    return limit;  /* 'limit + 1' is absent */

+  else  /* 'limit + 1' is also present */

+    return hash_search(t, limit);

+}

+

+

+

+#if defined(LUA_DEBUG)

+

+/* export these functions for the test library */

+

+Node *luaH_mainposition (const Table *t, const TValue *key) {

+  return mainpositionTV(t, key);

+}

+

+int luaH_isdummy (const Table *t) { return isdummy(t); }

+

+#endif

--- /dev/null

+++ b/ltable.h

@@ -1,0 +1,62 @@

+/*

+** $Id: ltable.h $

+** Lua tables (hash)

+** See Copyright Notice in lua.h

+*/

+

+#ifndef ltable_h

+#define ltable_h

+

+#include "lobject.h"

+

+

+#define gnode(t,i)	(&(t)->node[i])

+#define gval(n)		(&(n)->i_val)

+#define gnext(n)	((n)->u.next)

+

+

+/*

+** Clear all bits of fast-access metamethods, which means that the table

+** may have any of these metamethods. (First access that fails after the

+** clearing will set the bit again.)

+*/

+#define invalidateTMcache(t)	((t)->flags &= ~maskflags)

+

+

+/* true when 't' is using 'dummynode' as its hash part */

+#define isdummy(t)		((t)->lastfree == NULL)

+

+

+/* allocated size for hash nodes */

+#define allocsizenode(t)	(isdummy(t) ? 0 : sizenode(t))

+

+

+/* returns the Node, given the value of a table entry */

+#define nodefromval(v)	cast(Node *, (v))

+

+

+LUAI_FUNC const TValue *luaH_getint (Table *t, lua_Integer key);

+LUAI_FUNC void luaH_setint (lua_State *L, Table *t, lua_Integer key,

+                                                    TValue *value);

+LUAI_FUNC const TValue *luaH_getshortstr (Table *t, TString *key);

+LUAI_FUNC const TValue *luaH_getstr (Table *t, TString *key);

+LUAI_FUNC const TValue *luaH_get (Table *t, const TValue *key);

+LUAI_FUNC TValue *luaH_newkey (lua_State *L, Table *t, const TValue *key);

+LUAI_FUNC TValue *luaH_set (lua_State *L, Table *t, const TValue *key);

+LUAI_FUNC Table *luaH_new (lua_State *L);

+LUAI_FUNC void luaH_resize (lua_State *L, Table *t, unsigned int nasize,

+                                                    unsigned int nhsize);

+LUAI_FUNC void luaH_resizearray (lua_State *L, Table *t, unsigned int nasize);

+LUAI_FUNC void luaH_free (lua_State *L, Table *t);

+LUAI_FUNC int luaH_next (lua_State *L, Table *t, StkId key);

+LUAI_FUNC lua_Unsigned luaH_getn (Table *t);

+LUAI_FUNC unsigned int luaH_realasize (const Table *t);

+

+

+#if defined(LUA_DEBUG)

+LUAI_FUNC Node *luaH_mainposition (const Table *t, const TValue *key);

+LUAI_FUNC int luaH_isdummy (const Table *t);

+#endif

+

+

+#endif

--- /dev/null

+++ b/ltablib.c

@@ -1,0 +1,428 @@

+/*

+** $Id: ltablib.c $

+** Library for Table Manipulation

+** See Copyright Notice in lua.h

+*/

+

+#define ltablib_c

+#define LUA_LIB

+

+#include "lprefix.h"

+

+

+#include <limits.h>

+#include <stddef.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "lauxlib.h"

+#include "lualib.h"

+

+

+/*

+** Operations that an object must define to mimic a table

+** (some functions only need some of them)

+*/

+#define TAB_R	1			/* read */

+#define TAB_W	2			/* write */

+#define TAB_L	4			/* length */

+#define TAB_RW	(TAB_R | TAB_W)		/* read/write */

+

+

+#define aux_getn(L,n,w)	(checktab(L, n, (w) | TAB_L), luaL_len(L, n))

+

+

+static int checkfield (lua_State *L, const char *key, int n) {

+  lua_pushstring(L, key);

+  return (lua_rawget(L, -n) != LUA_TNIL);

+}

+

+

+/*

+** Check that 'arg' either is a table or can behave like one (that is,

+** has a metatable with the required metamethods)

+*/

+static void checktab (lua_State *L, int arg, int what) {

+  if (lua_type(L, arg) != LUA_TTABLE) {  /* is it not a table? */

+    int n = 1;  /* number of elements to pop */

+    if (lua_getmetatable(L, arg) &&  /* must have metatable */

+        (!(what & TAB_R) || checkfield(L, "__index", ++n)) &&

+        (!(what & TAB_W) || checkfield(L, "__newindex", ++n)) &&

+        (!(what & TAB_L) || checkfield(L, "__len", ++n))) {

+      lua_pop(L, n);  /* pop metatable and tested metamethods */

+    }

+    else

+      luaL_checktype(L, arg, LUA_TTABLE);  /* force an error */

+  }

+}

+

+

+static int tinsert (lua_State *L) {

+  lua_Integer e = aux_getn(L, 1, TAB_RW) + 1;  /* first empty element */

+  lua_Integer pos;  /* where to insert new element */

+  switch (lua_gettop(L)) {

+    case 2: {  /* called with only 2 arguments */

+      pos = e;  /* insert new element at the end */

+      break;

+    }

+    case 3: {

+      lua_Integer i;

+      pos = luaL_checkinteger(L, 2);  /* 2nd argument is the position */

+      /* check whether 'pos' is in [1, e] */

+      luaL_argcheck(L, (lua_Unsigned)pos - 1u < (lua_Unsigned)e, 2,

+                       "position out of bounds");

+      for (i = e; i > pos; i--) {  /* move up elements */

+        lua_geti(L, 1, i - 1);

+        lua_seti(L, 1, i);  /* t[i] = t[i - 1] */

+      }

+      break;

+    }

+    default: {

+      return luaL_error(L, "wrong number of arguments to 'insert'");

+    }

+  }

+  lua_seti(L, 1, pos);  /* t[pos] = v */

+  return 0;

+}

+

+

+static int tremove (lua_State *L) {

+  lua_Integer size = aux_getn(L, 1, TAB_RW);

+  lua_Integer pos = luaL_optinteger(L, 2, size);

+  if (pos != size)  /* validate 'pos' if given */

+    /* check whether 'pos' is in [1, size + 1] */

+    luaL_argcheck(L, (lua_Unsigned)pos - 1u <= (lua_Unsigned)size, 1,

+                     "position out of bounds");

+  lua_geti(L, 1, pos);  /* result = t[pos] */

+  for ( ; pos < size; pos++) {

+    lua_geti(L, 1, pos + 1);

+    lua_seti(L, 1, pos);  /* t[pos] = t[pos + 1] */

+  }

+  lua_pushnil(L);

+  lua_seti(L, 1, pos);  /* remove entry t[pos] */

+  return 1;

+}

+

+

+/*

+** Copy elements (1[f], ..., 1[e]) into (tt[t], tt[t+1], ...). Whenever

+** possible, copy in increasing order, which is better for rehashing.

+** "possible" means destination after original range, or smaller

+** than origin, or copying to another table.

+*/

+static int tmove (lua_State *L) {

+  lua_Integer f = luaL_checkinteger(L, 2);

+  lua_Integer e = luaL_checkinteger(L, 3);

+  lua_Integer t = luaL_checkinteger(L, 4);

+  int tt = !lua_isnoneornil(L, 5) ? 5 : 1;  /* destination table */

+  checktab(L, 1, TAB_R);

+  checktab(L, tt, TAB_W);

+  if (e >= f) {  /* otherwise, nothing to move */

+    lua_Integer n, i;

+    luaL_argcheck(L, f > 0 || e < LUA_MAXINTEGER + f, 3,

+                  "too many elements to move");

+    n = e - f + 1;  /* number of elements to move */

+    luaL_argcheck(L, t <= LUA_MAXINTEGER - n + 1, 4,

+                  "destination wrap around");

+    if (t > e || t <= f || (tt != 1 && !lua_compare(L, 1, tt, LUA_OPEQ))) {

+      for (i = 0; i < n; i++) {

+        lua_geti(L, 1, f + i);

+        lua_seti(L, tt, t + i);

+      }

+    }

+    else {

+      for (i = n - 1; i >= 0; i--) {

+        lua_geti(L, 1, f + i);

+        lua_seti(L, tt, t + i);

+      }

+    }

+  }

+  lua_pushvalue(L, tt);  /* return destination table */

+  return 1;

+}

+

+

+static void addfield (lua_State *L, luaL_Buffer *b, lua_Integer i) {

+  lua_geti(L, 1, i);

+  if (!lua_isstring(L, -1))

+    luaL_error(L, "invalid value (%s) at index %d in table for 'concat'",

+                  luaL_typename(L, -1), i);

+  luaL_addvalue(b);

+}

+

+

+static int tconcat (lua_State *L) {

+  luaL_Buffer b;

+  lua_Integer last = aux_getn(L, 1, TAB_R);

+  size_t lsep;

+  const char *sep = luaL_optlstring(L, 2, "", &lsep);

+  lua_Integer i = luaL_optinteger(L, 3, 1);

+  last = luaL_optinteger(L, 4, last);

+  luaL_buffinit(L, &b);

+  for (; i < last; i++) {

+    addfield(L, &b, i);

+    luaL_addlstring(&b, sep, lsep);

+  }

+  if (i == last)  /* add last value (if interval was not empty) */

+    addfield(L, &b, i);

+  luaL_pushresult(&b);

+  return 1;

+}

+

+

+/*

+** {======================================================

+** Pack/unpack

+** =======================================================

+*/

+

+static int tpack (lua_State *L) {

+  int i;

+  int n = lua_gettop(L);  /* number of elements to pack */

+  lua_createtable(L, n, 1);  /* create result table */

+  lua_insert(L, 1);  /* put it at index 1 */

+  for (i = n; i >= 1; i--)  /* assign elements */

+    lua_seti(L, 1, i);

+  lua_pushinteger(L, n);

+  lua_setfield(L, 1, "n");  /* t.n = number of elements */

+  return 1;  /* return table */

+}

+

+

+static int tunpack (lua_State *L) {

+  lua_Unsigned n;

+  lua_Integer i = luaL_optinteger(L, 2, 1);

+  lua_Integer e = luaL_opt(L, luaL_checkinteger, 3, luaL_len(L, 1));

+  if (i > e) return 0;  /* empty range */

+  n = (lua_Unsigned)e - i;  /* number of elements minus 1 (avoid overflows) */

+  if (n >= (unsigned int)INT_MAX  || !lua_checkstack(L, (int)(++n)))

+    return luaL_error(L, "too many results to unpack");

+  for (; i < e; i++) {  /* push arg[i..e - 1] (to avoid overflows) */

+    lua_geti(L, 1, i);

+  }

+  lua_geti(L, 1, e);  /* push last element */

+  return (int)n;

+}

+

+/* }====================================================== */

+

+

+

+/*

+** {======================================================

+** Quicksort

+** (based on 'Algorithms in MODULA-3', Robert Sedgewick;

+**  Addison-Wesley, 1993.)

+** =======================================================

+*/

+

+

+/* type for array indices */

+typedef unsigned int IdxT;

+

+

+/*

+** Produce a "random" 'unsigned int' to randomize pivot choice. This

+** macro is used only when 'sort' detects a big imbalance in the result

+** of a partition. (If you don't want/need this "randomness", ~0 is a

+** good choice.)

+*/

+#if !defined(l_randomizePivot)		/* { */

+

+#include <time.h>

+

+/* size of 'e' measured in number of 'unsigned int's */

+#define sof(e)		(sizeof(e) / sizeof(unsigned int))

+

+/*

+** Use 'time' and 'clock' as sources of "randomness". Because we don't

+** know the types 'clock_t' and 'time_t', we cannot cast them to

+** anything without risking overflows. A safe way to use their values

+** is to copy them to an array of a known type and use the array values.

+*/

+static unsigned int l_randomizePivot (void) {

+  clock_t c = clock();

+  time_t t = time(NULL);

+  unsigned int buff[sof(c) + sof(t)];

+  unsigned int i, rnd = 0;

+  memcpy(buff, &c, sof(c) * sizeof(unsigned int));

+  memcpy(buff + sof(c), &t, sof(t) * sizeof(unsigned int));

+  for (i = 0; i < sof(buff); i++)

+    rnd += buff[i];

+  return rnd;

+}

+

+#endif					/* } */

+

+

+/* arrays larger than 'RANLIMIT' may use randomized pivots */

+#define RANLIMIT	100u

+

+

+static void set2 (lua_State *L, IdxT i, IdxT j) {

+  lua_seti(L, 1, i);

+  lua_seti(L, 1, j);

+}

+

+

+/*

+** Return true iff value at stack index 'a' is less than the value at

+** index 'b' (according to the order of the sort).

+*/

+static int sort_comp (lua_State *L, int a, int b) {

+  if (lua_isnil(L, 2))  /* no function? */

+    return lua_compare(L, a, b, LUA_OPLT);  /* a < b */

+  else {  /* function */

+    int res;

+    lua_pushvalue(L, 2);    /* push function */

+    lua_pushvalue(L, a-1);  /* -1 to compensate function */

+    lua_pushvalue(L, b-2);  /* -2 to compensate function and 'a' */

+    lua_call(L, 2, 1);      /* call function */

+    res = lua_toboolean(L, -1);  /* get result */

+    lua_pop(L, 1);          /* pop result */

+    return res;

+  }

+}

+

+

+/*

+** Does the partition: Pivot P is at the top of the stack.

+** precondition: a[lo] <= P == a[up-1] <= a[up],

+** so it only needs to do the partition from lo + 1 to up - 2.

+** Pos-condition: a[lo .. i - 1] <= a[i] == P <= a[i + 1 .. up]

+** returns 'i'.

+*/

+static IdxT partition (lua_State *L, IdxT lo, IdxT up) {

+  IdxT i = lo;  /* will be incremented before first use */

+  IdxT j = up - 1;  /* will be decremented before first use */

+  /* loop invariant: a[lo .. i] <= P <= a[j .. up] */

+  for (;;) {

+    /* next loop: repeat ++i while a[i] < P */

+    while ((void)lua_geti(L, 1, ++i), sort_comp(L, -1, -2)) {

+      if (i == up - 1)  /* a[i] < P  but a[up - 1] == P  ?? */

+        luaL_error(L, "invalid order function for sorting");

+      lua_pop(L, 1);  /* remove a[i] */

+    }

+    /* after the loop, a[i] >= P and a[lo .. i - 1] < P */

+    /* next loop: repeat --j while P < a[j] */

+    while ((void)lua_geti(L, 1, --j), sort_comp(L, -3, -1)) {

+      if (j < i)  /* j < i  but  a[j] > P ?? */

+        luaL_error(L, "invalid order function for sorting");

+      lua_pop(L, 1);  /* remove a[j] */

+    }

+    /* after the loop, a[j] <= P and a[j + 1 .. up] >= P */

+    if (j < i) {  /* no elements out of place? */

+      /* a[lo .. i - 1] <= P <= a[j + 1 .. i .. up] */

+      lua_pop(L, 1);  /* pop a[j] */

+      /* swap pivot (a[up - 1]) with a[i] to satisfy pos-condition */

+      set2(L, up - 1, i);

+      return i;

+    }

+    /* otherwise, swap a[i] - a[j] to restore invariant and repeat */

+    set2(L, i, j);

+  }

+}

+

+

+/*

+** Choose an element in the middle (2nd-3th quarters) of [lo,up]

+** "randomized" by 'rnd'

+*/

+static IdxT choosePivot (IdxT lo, IdxT up, unsigned int rnd) {

+  IdxT r4 = (up - lo) / 4;  /* range/4 */

+  IdxT p = rnd % (r4 * 2) + (lo + r4);

+  lua_assert(lo + r4 <= p && p <= up - r4);

+  return p;

+}

+

+

+/*

+** Quicksort algorithm (recursive function)

+*/

+static void auxsort (lua_State *L, IdxT lo, IdxT up,

+                                   unsigned int rnd) {

+  while (lo < up) {  /* loop for tail recursion */

+    IdxT p;  /* Pivot index */

+    IdxT n;  /* to be used later */

+    /* sort elements 'lo', 'p', and 'up' */

+    lua_geti(L, 1, lo);

+    lua_geti(L, 1, up);

+    if (sort_comp(L, -1, -2))  /* a[up] < a[lo]? */

+      set2(L, lo, up);  /* swap a[lo] - a[up] */

+    else

+      lua_pop(L, 2);  /* remove both values */

+    if (up - lo == 1)  /* only 2 elements? */

+      return;  /* already sorted */

+    if (up - lo < RANLIMIT || rnd == 0)  /* small interval or no randomize? */

+      p = (lo + up)/2;  /* middle element is a good pivot */

+    else  /* for larger intervals, it is worth a random pivot */

+      p = choosePivot(lo, up, rnd);

+    lua_geti(L, 1, p);

+    lua_geti(L, 1, lo);

+    if (sort_comp(L, -2, -1))  /* a[p] < a[lo]? */

+      set2(L, p, lo);  /* swap a[p] - a[lo] */

+    else {

+      lua_pop(L, 1);  /* remove a[lo] */

+      lua_geti(L, 1, up);

+      if (sort_comp(L, -1, -2))  /* a[up] < a[p]? */

+        set2(L, p, up);  /* swap a[up] - a[p] */

+      else

+        lua_pop(L, 2);

+    }

+    if (up - lo == 2)  /* only 3 elements? */

+      return;  /* already sorted */

+    lua_geti(L, 1, p);  /* get middle element (Pivot) */

+    lua_pushvalue(L, -1);  /* push Pivot */

+    lua_geti(L, 1, up - 1);  /* push a[up - 1] */

+    set2(L, p, up - 1);  /* swap Pivot (a[p]) with a[up - 1] */

+    p = partition(L, lo, up);

+    /* a[lo .. p - 1] <= a[p] == P <= a[p + 1 .. up] */

+    if (p - lo < up - p) {  /* lower interval is smaller? */

+      auxsort(L, lo, p - 1, rnd);  /* call recursively for lower interval */

+      n = p - lo;  /* size of smaller interval */

+      lo = p + 1;  /* tail call for [p + 1 .. up] (upper interval) */

+    }

+    else {

+      auxsort(L, p + 1, up, rnd);  /* call recursively for upper interval */

+      n = up - p;  /* size of smaller interval */

+      up = p - 1;  /* tail call for [lo .. p - 1]  (lower interval) */

+    }

+    if ((up - lo) / 128 > n) /* partition too imbalanced? */

+      rnd = l_randomizePivot();  /* try a new randomization */

+  }  /* tail call auxsort(L, lo, up, rnd) */

+}

+

+

+static int sort (lua_State *L) {

+  lua_Integer n = aux_getn(L, 1, TAB_RW);

+  if (n > 1) {  /* non-trivial interval? */

+    luaL_argcheck(L, n < INT_MAX, 1, "array too big");

+    if (!lua_isnoneornil(L, 2))  /* is there a 2nd argument? */

+      luaL_checktype(L, 2, LUA_TFUNCTION);  /* must be a function */

+    lua_settop(L, 2);  /* make sure there are two arguments */

+    auxsort(L, 1, (IdxT)n, 0);

+  }

+  return 0;

+}

+

+/* }====================================================== */

+

+

+static const luaL_Reg tab_funcs[] = {

+  {"concat", tconcat},

+  {"insert", tinsert},

+  {"pack", tpack},

+  {"unpack", tunpack},

+  {"remove", tremove},

+  {"move", tmove},

+  {"sort", sort},

+  {NULL, NULL}

+};

+

+

+LUAMOD_API int luaopen_table (lua_State *L) {

+  luaL_newlib(L, tab_funcs);

+  return 1;

+}

+

--- /dev/null

+++ b/ltm.c

@@ -1,0 +1,270 @@

+/*

+** $Id: ltm.c $

+** Tag methods

+** See Copyright Notice in lua.h

+*/

+

+#define ltm_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <string.h>

+

+#include "lua.h"

+

+#include "ldebug.h"

+#include "ldo.h"

+#include "lgc.h"

+#include "lobject.h"

+#include "lstate.h"

+#include "lstring.h"

+#include "ltable.h"

+#include "ltm.h"

+#include "lvm.h"

+

+

+static const char udatatypename[] = "userdata";

+

+LUAI_DDEF const char *const luaT_typenames_[LUA_TOTALTYPES] = {

+  "no value",

+  "nil", "boolean", udatatypename, "number",

+  "string", "table", "function", udatatypename, "thread",

+  "upvalue", "proto" /* these last cases are used for tests only */

+};

+

+

+void luaT_init (lua_State *L) {

+  static const char *const luaT_eventname[] = {  /* ORDER TM */

+    "__index", "__newindex",

+    "__gc", "__mode", "__len", "__eq",

+    "__add", "__sub", "__mul", "__mod", "__pow",

+    "__div", "__idiv",

+    "__band", "__bor", "__bxor", "__shl", "__shr",

+    "__unm", "__bnot", "__lt", "__le",

+    "__concat", "__call", "__close"

+  };

+  int i;

+  for (i=0; i<TM_N; i++) {

+    G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]);

+    luaC_fix(L, obj2gco(G(L)->tmname[i]));  /* never collect these names */

+  }

+}

+

+

+/*

+** function to be used with macro "fasttm": optimized for absence of

+** tag methods

+*/

+const TValue *luaT_gettm (Table *events, TMS event, TString *ename) {

+  const TValue *tm = luaH_getshortstr(events, ename);

+  lua_assert(event <= TM_EQ);

+  if (notm(tm)) {  /* no tag method? */

+    events->flags |= cast_byte(1u<<event);  /* cache this fact */

+    return NULL;

+  }

+  else return tm;

+}

+

+

+const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o, TMS event) {

+  Table *mt;

+  switch (ttype(o)) {

+    case LUA_TTABLE:

+      mt = hvalue(o)->metatable;

+      break;

+    case LUA_TUSERDATA:

+      mt = uvalue(o)->metatable;

+      break;

+    default:

+      mt = G(L)->mt[ttype(o)];

+  }

+  return (mt ? luaH_getshortstr(mt, G(L)->tmname[event]) : &G(L)->nilvalue);

+}

+

+

+/*

+** Return the name of the type of an object. For tables and userdata

+** with metatable, use their '__name' metafield, if present.

+*/

+const char *luaT_objtypename (lua_State *L, const TValue *o) {

+  Table *mt;

+  if ((ttistable(o) && (mt = hvalue(o)->metatable) != NULL) ||

+      (ttisfulluserdata(o) && (mt = uvalue(o)->metatable) != NULL)) {

+    const TValue *name = luaH_getshortstr(mt, luaS_new(L, "__name"));

+    if (ttisstring(name))  /* is '__name' a string? */

+      return getstr(tsvalue(name));  /* use it as type name */

+  }

+  return ttypename(ttype(o));  /* else use standard type name */

+}

+

+

+void luaT_callTM (lua_State *L, const TValue *f, const TValue *p1,

+                  const TValue *p2, const TValue *p3) {

+  StkId func = L->top;

+  setobj2s(L, func, f);  /* push function (assume EXTRA_STACK) */

+  setobj2s(L, func + 1, p1);  /* 1st argument */

+  setobj2s(L, func + 2, p2);  /* 2nd argument */

+  setobj2s(L, func + 3, p3);  /* 3rd argument */

+  L->top = func + 4;

+  /* metamethod may yield only when called from Lua code */

+  if (isLuacode(L->ci))

+    luaD_call(L, func, 0);

+  else

+    luaD_callnoyield(L, func, 0);

+}

+

+

+void luaT_callTMres (lua_State *L, const TValue *f, const TValue *p1,

+                     const TValue *p2, StkId res) {

+  ptrdiff_t result = savestack(L, res);

+  StkId func = L->top;

+  setobj2s(L, func, f);  /* push function (assume EXTRA_STACK) */

+  setobj2s(L, func + 1, p1);  /* 1st argument */

+  setobj2s(L, func + 2, p2);  /* 2nd argument */

+  L->top += 3;

+  /* metamethod may yield only when called from Lua code */

+  if (isLuacode(L->ci))

+    luaD_call(L, func, 1);

+  else

+    luaD_callnoyield(L, func, 1);

+  res = restorestack(L, result);

+  setobjs2s(L, res, --L->top);  /* move result to its place */

+}

+

+

+static int callbinTM (lua_State *L, const TValue *p1, const TValue *p2,

+                      StkId res, TMS event) {

+  const TValue *tm = luaT_gettmbyobj(L, p1, event);  /* try first operand */

+  if (notm(tm))

+    tm = luaT_gettmbyobj(L, p2, event);  /* try second operand */

+  if (notm(tm)) return 0;

+  luaT_callTMres(L, tm, p1, p2, res);

+  return 1;

+}

+

+

+void luaT_trybinTM (lua_State *L, const TValue *p1, const TValue *p2,

+                    StkId res, TMS event) {

+  if (!callbinTM(L, p1, p2, res, event)) {

+    switch (event) {

+      case TM_BAND: case TM_BOR: case TM_BXOR:

+      case TM_SHL: case TM_SHR: case TM_BNOT: {

+        if (ttisnumber(p1) && ttisnumber(p2))

+          luaG_tointerror(L, p1, p2);

+        else

+          luaG_opinterror(L, p1, p2, "perform bitwise operation on");

+      }

+      /* calls never return, but to avoid warnings: *//* FALLTHROUGH */

+      default:

+        luaG_opinterror(L, p1, p2, "perform arithmetic on");

+    }

+  }

+}

+

+

+void luaT_tryconcatTM (lua_State *L) {

+  StkId top = L->top;

+  if (!callbinTM(L, s2v(top - 2), s2v(top - 1), top - 2, TM_CONCAT))

+    luaG_concaterror(L, s2v(top - 2), s2v(top - 1));

+}

+

+

+void luaT_trybinassocTM (lua_State *L, const TValue *p1, const TValue *p2,

+                                       int flip, StkId res, TMS event) {

+  if (flip)

+    luaT_trybinTM(L, p2, p1, res, event);

+  else

+    luaT_trybinTM(L, p1, p2, res, event);

+}

+

+

+void luaT_trybiniTM (lua_State *L, const TValue *p1, lua_Integer i2,

+                                   int flip, StkId res, TMS event) {

+  TValue aux;

+  setivalue(&aux, i2);

+  luaT_trybinassocTM(L, p1, &aux, flip, res, event);

+}

+

+

+/*

+** Calls an order tag method.

+** For lessequal, LUA_COMPAT_LT_LE keeps compatibility with old

+** behavior: if there is no '__le', try '__lt', based on l <= r iff

+** !(r < l) (assuming a total order). If the metamethod yields during

+** this substitution, the continuation has to know about it (to negate

+** the result of r<l); bit CIST_LEQ in the call status keeps that

+** information.

+*/

+int luaT_callorderTM (lua_State *L, const TValue *p1, const TValue *p2,

+                      TMS event) {

+  if (callbinTM(L, p1, p2, L->top, event))  /* try original event */

+    return !l_isfalse(s2v(L->top));

+#if defined(LUA_COMPAT_LT_LE)

+  else if (event == TM_LE) {

+      /* try '!(p2 < p1)' for '(p1 <= p2)' */

+      L->ci->callstatus |= CIST_LEQ;  /* mark it is doing 'lt' for 'le' */

+      if (callbinTM(L, p2, p1, L->top, TM_LT)) {

+        L->ci->callstatus ^= CIST_LEQ;  /* clear mark */

+        return l_isfalse(s2v(L->top));

+      }

+      /* else error will remove this 'ci'; no need to clear mark */

+  }

+#endif

+  luaG_ordererror(L, p1, p2);  /* no metamethod found */

+  return 0;  /* to avoid warnings */

+}

+

+

+int luaT_callorderiTM (lua_State *L, const TValue *p1, int v2,

+                       int flip, int isfloat, TMS event) {

+  TValue aux; const TValue *p2;

+  if (isfloat) {

+    setfltvalue(&aux, cast_num(v2));

+  }

+  else

+    setivalue(&aux, v2);

+  if (flip) {  /* arguments were exchanged? */

+    p2 = p1; p1 = &aux;  /* correct them */

+  }

+  else

+    p2 = &aux;

+  return luaT_callorderTM(L, p1, p2, event);

+}

+

+

+void luaT_adjustvarargs (lua_State *L, int nfixparams, CallInfo *ci,

+                         const Proto *p) {

+  int i;

+  int actual = cast_int(L->top - ci->func) - 1;  /* number of arguments */

+  int nextra = actual - nfixparams;  /* number of extra arguments */

+  ci->u.l.nextraargs = nextra;

+  luaD_checkstack(L, p->maxstacksize + 1);

+  /* copy function to the top of the stack */

+  setobjs2s(L, L->top++, ci->func);

+  /* move fixed parameters to the top of the stack */

+  for (i = 1; i <= nfixparams; i++) {

+    setobjs2s(L, L->top++, ci->func + i);

+    setnilvalue(s2v(ci->func + i));  /* erase original parameter (for GC) */

+  }

+  ci->func += actual + 1;

+  ci->top += actual + 1;

+  lua_assert(L->top <= ci->top && ci->top <= L->stack_last);

+}

+

+

+void luaT_getvarargs (lua_State *L, CallInfo *ci, StkId where, int wanted) {

+  int i;

+  int nextra = ci->u.l.nextraargs;

+  if (wanted < 0) {

+    wanted = nextra;  /* get all extra arguments available */

+    checkstackGCp(L, nextra, where);  /* ensure stack space */

+    L->top = where + nextra;  /* next instruction will need top */

+  }

+  for (i = 0; i < wanted && i < nextra; i++)

+    setobjs2s(L, where + i, ci->func - nextra + i);

+  for (; i < wanted; i++)   /* complete required results with nil */

+    setnilvalue(s2v(where + i));

+}

+

--- /dev/null

+++ b/ltm.h

@@ -1,0 +1,103 @@

+/*

+** $Id: ltm.h $

+** Tag methods

+** See Copyright Notice in lua.h

+*/

+

+#ifndef ltm_h

+#define ltm_h

+

+

+#include "lobject.h"

+

+

+/*

+* WARNING: if you change the order of this enumeration,

+* grep "ORDER TM" and "ORDER OP"

+*/

+typedef enum {

+  TM_INDEX,

+  TM_NEWINDEX,

+  TM_GC,

+  TM_MODE,

+  TM_LEN,

+  TM_EQ,  /* last tag method with fast access */

+  TM_ADD,

+  TM_SUB,

+  TM_MUL,

+  TM_MOD,

+  TM_POW,

+  TM_DIV,

+  TM_IDIV,

+  TM_BAND,

+  TM_BOR,

+  TM_BXOR,

+  TM_SHL,

+  TM_SHR,

+  TM_UNM,

+  TM_BNOT,

+  TM_LT,

+  TM_LE,

+  TM_CONCAT,

+  TM_CALL,

+  TM_CLOSE,

+  TM_N		/* number of elements in the enum */

+} TMS;

+

+

+/*

+** Mask with 1 in all fast-access methods. A 1 in any of these bits

+** in the flag of a (meta)table means the metatable does not have the

+** corresponding metamethod field. (Bit 7 of the flag is used for

+** 'isrealasize'.)

+*/

+#define maskflags	(~(~0u << (TM_EQ + 1)))

+

+

+/*

+** Test whether there is no tagmethod.

+** (Because tagmethods use raw accesses, the result may be an "empty" nil.)

+*/

+#define notm(tm)	ttisnil(tm)

+

+

+#define gfasttm(g,et,e) ((et) == NULL ? NULL : \

+  ((et)->flags & (1u<<(e))) ? NULL : luaT_gettm(et, e, (g)->tmname[e]))

+

+#define fasttm(l,et,e)	gfasttm(G(l), et, e)

+

+#define ttypename(x)	luaT_typenames_[(x) + 1]

+

+LUAI_DDEC(const char *const luaT_typenames_[LUA_TOTALTYPES];)

+

+

+LUAI_FUNC const char *luaT_objtypename (lua_State *L, const TValue *o);

+

+LUAI_FUNC const TValue *luaT_gettm (Table *events, TMS event, TString *ename);

+LUAI_FUNC const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o,

+                                                       TMS event);

+LUAI_FUNC void luaT_init (lua_State *L);

+

+LUAI_FUNC void luaT_callTM (lua_State *L, const TValue *f, const TValue *p1,

+                            const TValue *p2, const TValue *p3);

+LUAI_FUNC void luaT_callTMres (lua_State *L, const TValue *f,

+                            const TValue *p1, const TValue *p2, StkId p3);

+LUAI_FUNC void luaT_trybinTM (lua_State *L, const TValue *p1, const TValue *p2,

+                              StkId res, TMS event);

+LUAI_FUNC void luaT_tryconcatTM (lua_State *L);

+LUAI_FUNC void luaT_trybinassocTM (lua_State *L, const TValue *p1,

+       const TValue *p2, int inv, StkId res, TMS event);

+LUAI_FUNC void luaT_trybiniTM (lua_State *L, const TValue *p1, lua_Integer i2,

+                               int inv, StkId res, TMS event);

+LUAI_FUNC int luaT_callorderTM (lua_State *L, const TValue *p1,

+                                const TValue *p2, TMS event);

+LUAI_FUNC int luaT_callorderiTM (lua_State *L, const TValue *p1, int v2,

+                                 int inv, int isfloat, TMS event);

+

+LUAI_FUNC void luaT_adjustvarargs (lua_State *L, int nfixparams,

+                                   struct CallInfo *ci, const Proto *p);

+LUAI_FUNC void luaT_getvarargs (lua_State *L, struct CallInfo *ci,

+                                              StkId where, int wanted);

+

+

+#endif

--- /dev/null

+++ b/lua.c

@@ -1,0 +1,639 @@

+/*

+** $Id: lua.c $

+** Lua stand-alone interpreter

+** See Copyright Notice in lua.h

+*/

+

+#define lua_c

+

+#include "lprefix.h"

+

+

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+

+#include <signal.h>

+

+#include "lua.h"

+

+#include "lauxlib.h"

+#include "lualib.h"

+

+

+#if !defined(LUA_PROGNAME)

+#define LUA_PROGNAME		"lua"

+#endif

+

+#if !defined(LUA_INIT_VAR)

+#define LUA_INIT_VAR		"LUA_INIT"

+#endif

+

+#define LUA_INITVARVERSION	LUA_INIT_VAR LUA_VERSUFFIX

+

+

+static lua_State *globalL = NULL;

+

+static const char *progname = LUA_PROGNAME;

+

+

+/*

+** Hook set by signal function to stop the interpreter.

+*/

+static void lstop (lua_State *L, lua_Debug *ar) {

+  (void)ar;  /* unused arg. */

+  lua_sethook(L, NULL, 0, 0);  /* reset hook */

+  luaL_error(L, "interrupted!");

+}

+

+

+/*

+** Function to be called at a C signal. Because a C signal cannot

+** just change a Lua state (as there is no proper synchronization),

+** this function only sets a hook that, when called, will stop the

+** interpreter.

+*/

+static void laction (int i) {

+  int flag = LUA_MASKCALL | LUA_MASKRET | LUA_MASKLINE | LUA_MASKCOUNT;

+  signal(i, SIG_DFL); /* if another SIGINT happens, terminate process */

+  lua_sethook(globalL, lstop, flag, 1);

+}

+

+

+static void print_usage (const char *badoption) {

+  lua_writestringerror("%s: ", progname);

+  if (badoption[1] == 'e' || badoption[1] == 'l')

+    lua_writestringerror("'%s' needs argument\n", badoption);

+  else

+    lua_writestringerror("unrecognized option '%s'\n", badoption);

+  lua_writestringerror(

+  "usage: %s [options] [script [args]]\n"

+  "Available options are:\n"

+  "  -e stat  execute string 'stat'\n"

+  "  -i       enter interactive mode after executing 'script'\n"

+  "  -l name  require library 'name' into global 'name'\n"

+  "  -v       show version information\n"

+  "  -E       ignore environment variables\n"

+  "  -W       turn warnings on\n"

+  "  --       stop handling options\n"

+  "  -        stop handling options and execute stdin\n"

+  ,

+  progname);

+}

+

+

+/*

+** Prints an error message, adding the program name in front of it

+** (if present)

+*/

+static void l_message (const char *pname, const char *msg) {

+  if (pname) lua_writestringerror("%s: ", pname);

+  lua_writestringerror("%s\n", msg);

+}

+

+

+/*

+** Check whether 'status' is not OK and, if so, prints the error

+** message on the top of the stack. It assumes that the error object

+** is a string, as it was either generated by Lua or by 'msghandler'.

+*/

+static int report (lua_State *L, int status) {

+  if (status != LUA_OK) {

+    const char *msg = lua_tostring(L, -1);

+    l_message(progname, msg);

+    lua_pop(L, 1);  /* remove message */

+  }

+  return status;

+}

+

+

+/*

+** Message handler used to run all chunks

+*/

+static int msghandler (lua_State *L) {

+  const char *msg = lua_tostring(L, 1);

+  if (msg == NULL) {  /* is error object not a string? */

+    if (luaL_callmeta(L, 1, "__tostring") &&  /* does it have a metamethod */

+        lua_type(L, -1) == LUA_TSTRING)  /* that produces a string? */

+      return 1;  /* that is the message */

+    else

+      msg = lua_pushfstring(L, "(error object is a %s value)",

+                               luaL_typename(L, 1));

+  }

+  luaL_traceback(L, L, msg, 1);  /* append a standard traceback */

+  return 1;  /* return the traceback */

+}

+

+

+/*

+** Interface to 'lua_pcall', which sets appropriate message function

+** and C-signal handler. Used to run all chunks.

+*/

+static int docall (lua_State *L, int narg, int nres) {

+  int status;

+  int base = lua_gettop(L) - narg;  /* function index */

+  lua_pushcfunction(L, msghandler);  /* push message handler */

+  lua_insert(L, base);  /* put it under function and args */

+  globalL = L;  /* to be available to 'laction' */

+  signal(SIGINT, laction);  /* set C-signal handler */

+  status = lua_pcall(L, narg, nres, base);

+  signal(SIGINT, SIG_DFL); /* reset C-signal handler */

+  lua_remove(L, base);  /* remove message handler from the stack */

+  return status;

+}

+

+

+static void print_version (void) {

+  lua_writestring(LUA_COPYRIGHT, strlen(LUA_COPYRIGHT));

+  lua_writeline();

+}

+

+

+/*

+** Create the 'arg' table, which stores all arguments from the

+** command line ('argv'). It should be aligned so that, at index 0,

+** it has 'argv[script]', which is the script name. The arguments

+** to the script (everything after 'script') go to positive indices;

+** other arguments (before the script name) go to negative indices.

+** If there is no script name, assume interpreter's name as base.

+*/

+static void createargtable (lua_State *L, char **argv, int argc, int script) {

+  int i, narg;

+  if (script == argc) script = 0;  /* no script name? */

+  narg = argc - (script + 1);  /* number of positive indices */

+  lua_createtable(L, narg, script + 1);

+  for (i = 0; i < argc; i++) {

+    lua_pushstring(L, argv[i]);

+    lua_rawseti(L, -2, i - script);

+  }

+  lua_setglobal(L, "arg");

+}

+

+

+static int dochunk (lua_State *L, int status) {

+  if (status == LUA_OK) status = docall(L, 0, 0);

+  return report(L, status);

+}

+

+

+static int dofile (lua_State *L, const char *name) {

+  return dochunk(L, luaL_loadfile(L, name));

+}

+

+

+static int dostring (lua_State *L, const char *s, const char *name) {

+  return dochunk(L, luaL_loadbuffer(L, s, strlen(s), name));

+}

+

+

+/*

+** Calls 'require(name)' and stores the result in a global variable

+** with the given name.

+*/

+static int dolibrary (lua_State *L, const char *name) {

+  int status;

+  lua_getglobal(L, "require");

+  lua_pushstring(L, name);

+  status = docall(L, 1, 1);  /* call 'require(name)' */

+  if (status == LUA_OK)

+    lua_setglobal(L, name);  /* global[name] = require return */

+  return report(L, status);

+}

+

+

+/*

+** Push on the stack the contents of table 'arg' from 1 to #arg

+*/

+static int pushargs (lua_State *L) {

+  int i, n;

+  if (lua_getglobal(L, "arg") != LUA_TTABLE)

+    luaL_error(L, "'arg' is not a table");

+  n = (int)luaL_len(L, -1);

+  luaL_checkstack(L, n + 3, "too many arguments to script");

+  for (i = 1; i <= n; i++)

+    lua_rawgeti(L, -i, i);

+  lua_remove(L, -i);  /* remove table from the stack */

+  return n;

+}

+

+

+static int handle_script (lua_State *L, char **argv) {

+  int status;

+  const char *fname = argv[0];

+  if (strcmp(fname, "-") == 0 && strcmp(argv[-1], "--") != 0)

+    fname = NULL;  /* stdin */

+  status = luaL_loadfile(L, fname);

+  if (status == LUA_OK) {

+    int n = pushargs(L);  /* push arguments to script */

+    status = docall(L, n, LUA_MULTRET);

+  }

+  return report(L, status);

+}

+

+

+/* bits of various argument indicators in 'args' */

+#define has_error	1	/* bad option */

+#define has_i		2	/* -i */

+#define has_v		4	/* -v */

+#define has_e		8	/* -e */

+#define has_E		16	/* -E */

+

+

+/*

+** Traverses all arguments from 'argv', returning a mask with those

+** needed before running any Lua code (or an error code if it finds

+** any invalid argument). 'first' returns the first not-handled argument

+** (either the script name or a bad argument in case of error).

+*/

+static int collectargs (char **argv, int *first) {

+  int args = 0;

+  int i;

+  for (i = 1; argv[i] != NULL; i++) {

+    *first = i;

+    if (argv[i][0] != '-')  /* not an option? */

+        return args;  /* stop handling options */

+    switch (argv[i][1]) {  /* else check option */

+      case '-':  /* '--' */

+        if (argv[i][2] != '\0')  /* extra characters after '--'? */

+          return has_error;  /* invalid option */

+        *first = i + 1;

+        return args;

+      case '\0':  /* '-' */

+        return args;  /* script "name" is '-' */

+      case 'E':

+        if (argv[i][2] != '\0')  /* extra characters? */

+          return has_error;  /* invalid option */

+        args |= has_E;

+        break;

+      case 'W':

+        if (argv[i][2] != '\0')  /* extra characters? */

+          return has_error;  /* invalid option */

+        break;

+      case 'i':

+        args |= has_i;  /* (-i implies -v) *//* FALLTHROUGH */

+      case 'v':

+        if (argv[i][2] != '\0')  /* extra characters? */

+          return has_error;  /* invalid option */

+        args |= has_v;

+        break;

+      case 'e':

+        args |= has_e;  /* FALLTHROUGH */

+      case 'l':  /* both options need an argument */

+        if (argv[i][2] == '\0') {  /* no concatenated argument? */

+          i++;  /* try next 'argv' */

+          if (argv[i] == NULL || argv[i][0] == '-')

+            return has_error;  /* no next argument or it is another option */

+        }

+        break;

+      default:  /* invalid option */

+        return has_error;

+    }

+  }

+  *first = i;  /* no script name */

+  return args;

+}

+

+

+/*

+** Processes options 'e' and 'l', which involve running Lua code, and

+** 'W', which also affects the state.

+** Returns 0 if some code raises an error.

+*/

+static int runargs (lua_State *L, char **argv, int n) {

+  int i;

+  for (i = 1; i < n; i++) {

+    int option = argv[i][1];

+    lua_assert(argv[i][0] == '-');  /* already checked */

+    switch (option) {

+      case 'e':  case 'l': {

+        int status;

+        const char *extra = argv[i] + 2;  /* both options need an argument */

+        if (*extra == '\0') extra = argv[++i];

+        lua_assert(extra != NULL);

+        status = (option == 'e')

+                 ? dostring(L, extra, "=(command line)")

+                 : dolibrary(L, extra);

+        if (status != LUA_OK) return 0;

+        break;

+      }

+      case 'W':

+        lua_warning(L, "@on", 0);  /* warnings on */

+        break;

+    }

+  }

+  return 1;

+}

+

+

+static int handle_luainit (lua_State *L) {

+  const char *name = "=" LUA_INITVARVERSION;

+  const char *init = getenv(name + 1);

+  if (init == NULL) {

+    name = "=" LUA_INIT_VAR;

+    init = getenv(name + 1);  /* try alternative name */

+  }

+  if (init == NULL) return LUA_OK;

+  else if (init[0] == '@')

+    return dofile(L, init+1);

+  else

+    return dostring(L, init, name);

+}

+

+

+/*

+** {==================================================================

+** Read-Eval-Print Loop (REPL)

+** ===================================================================

+*/

+

+#if !defined(LUA_PROMPT)

+#define LUA_PROMPT		"> "

+#define LUA_PROMPT2		">> "

+#endif

+

+#if !defined(LUA_MAXINPUT)

+#define LUA_MAXINPUT		512

+#endif

+

+

+/*

+** lua_stdin_is_tty detects whether the standard input is a 'tty' (that

+** is, whether we're running lua interactively).

+*/

+#if !defined(lua_stdin_is_tty)	/* { */

+

+#if defined(LUA_USE_POSIX)	/* { */

+

+#include <unistd.h>

+#define lua_stdin_is_tty()	isatty(0)

+

+#elif defined(LUA_USE_WINDOWS)	/* }{ */

+

+#include <io.h>

+#include <windows.h>

+

+#define lua_stdin_is_tty()	_isatty(_fileno(stdin))

+

+#else				/* }{ */

+

+/* ISO C definition */

+#define lua_stdin_is_tty()	1  /* assume stdin is a tty */

+

+#endif				/* } */

+

+#endif				/* } */

+

+

+/*

+** lua_readline defines how to show a prompt and then read a line from

+** the standard input.

+** lua_saveline defines how to "save" a read line in a "history".

+** lua_freeline defines how to free a line read by lua_readline.

+*/

+#if !defined(lua_readline)	/* { */

+

+#if defined(LUA_USE_READLINE)	/* { */

+

+#include <readline/readline.h>

+#include <readline/history.h>

+#define lua_initreadline(L)	((void)L, rl_readline_name="lua")

+#define lua_readline(L,b,p)	((void)L, ((b)=readline(p)) != NULL)

+#define lua_saveline(L,line)	((void)L, add_history(line))

+#define lua_freeline(L,b)	((void)L, free(b))

+

+#else				/* }{ */

+

+#define lua_initreadline(L)  ((void)L)

+#define lua_readline(L,b,p) \

+        ((void)L, fputs(p, stdout), fflush(stdout),  /* show prompt */ \

+        fgets(b, LUA_MAXINPUT, stdin) != NULL)  /* get line */

+#define lua_saveline(L,line)	{ (void)L; (void)line; }

+#define lua_freeline(L,b)	{ (void)L; (void)b; }

+

+#endif				/* } */

+

+#endif				/* } */

+

+

+/*

+** Return the string to be used as a prompt by the interpreter. Leave

+** the string (or nil, if using the default value) on the stack, to keep

+** it anchored.

+*/

+static const char *get_prompt (lua_State *L, int firstline) {

+  if (lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2") == LUA_TNIL)

+    return (firstline ? LUA_PROMPT : LUA_PROMPT2);  /* use the default */

+  else {  /* apply 'tostring' over the value */

+    const char *p = luaL_tolstring(L, -1, NULL);

+    lua_remove(L, -2);  /* remove original value */

+    return p;

+  }

+}

+

+/* mark in error messages for incomplete statements */

+#define EOFMARK		"<eof>"

+#define marklen		(sizeof(EOFMARK)/sizeof(char) - 1)

+

+

+/*

+** Check whether 'status' signals a syntax error and the error

+** message at the top of the stack ends with the above mark for

+** incomplete statements.

+*/

+static int incomplete (lua_State *L, int status) {

+  if (status == LUA_ERRSYNTAX) {

+    size_t lmsg;

+    const char *msg = lua_tolstring(L, -1, &lmsg);

+    if (lmsg >= marklen && strcmp(msg + lmsg - marklen, EOFMARK) == 0) {

+      lua_pop(L, 1);

+      return 1;

+    }

+  }

+  return 0;  /* else... */

+}

+

+

+/*

+** Prompt the user, read a line, and push it into the Lua stack.

+*/

+static int pushline (lua_State *L, int firstline) {

+  char buffer[LUA_MAXINPUT];

+  char *b = buffer;

+  size_t l;

+  const char *prmt = get_prompt(L, firstline);

+  int readstatus = lua_readline(L, b, prmt);

+  if (readstatus == 0)

+    return 0;  /* no input (prompt will be popped by caller) */

+  lua_pop(L, 1);  /* remove prompt */

+  l = strlen(b);

+  if (l > 0 && b[l-1] == '\n')  /* line ends with newline? */

+    b[--l] = '\0';  /* remove it */

+  if (firstline && b[0] == '=')  /* for compatibility with 5.2, ... */

+    lua_pushfstring(L, "return %s", b + 1);  /* change '=' to 'return' */

+  else

+    lua_pushlstring(L, b, l);

+  lua_freeline(L, b);

+  return 1;

+}

+

+

+/*

+** Try to compile line on the stack as 'return <line>;'; on return, stack

+** has either compiled chunk or original line (if compilation failed).

+*/

+static int addreturn (lua_State *L) {

+  const char *line = lua_tostring(L, -1);  /* original line */

+  const char *retline = lua_pushfstring(L, "return %s;", line);

+  int status = luaL_loadbuffer(L, retline, strlen(retline), "=stdin");

+  if (status == LUA_OK) {

+    lua_remove(L, -2);  /* remove modified line */

+    if (line[0] != '\0')  /* non empty? */

+      lua_saveline(L, line);  /* keep history */

+  }

+  else

+    lua_pop(L, 2);  /* pop result from 'luaL_loadbuffer' and modified line */

+  return status;

+}

+

+

+/*

+** Read multiple lines until a complete Lua statement

+*/

+static int multiline (lua_State *L) {

+  for (;;) {  /* repeat until gets a complete statement */

+    size_t len;

+    const char *line = lua_tolstring(L, 1, &len);  /* get what it has */

+    int status = luaL_loadbuffer(L, line, len, "=stdin");  /* try it */

+    if (!incomplete(L, status) || !pushline(L, 0)) {

+      lua_saveline(L, line);  /* keep history */

+      return status;  /* cannot or should not try to add continuation line */

+    }

+    lua_pushliteral(L, "\n");  /* add newline... */

+    lua_insert(L, -2);  /* ...between the two lines */

+    lua_concat(L, 3);  /* join them */

+  }

+}

+

+

+/*

+** Read a line and try to load (compile) it first as an expression (by

+** adding "return " in front of it) and second as a statement. Return

+** the final status of load/call with the resulting function (if any)

+** in the top of the stack.

+*/

+static int loadline (lua_State *L) {

+  int status;

+  lua_settop(L, 0);

+  if (!pushline(L, 1))

+    return -1;  /* no input */

+  if ((status = addreturn(L)) != LUA_OK)  /* 'return ...' did not work? */

+    status = multiline(L);  /* try as command, maybe with continuation lines */

+  lua_remove(L, 1);  /* remove line from the stack */

+  lua_assert(lua_gettop(L) == 1);

+  return status;

+}

+

+

+/*

+** Prints (calling the Lua 'print' function) any values on the stack

+*/

+static void l_print (lua_State *L) {

+  int n = lua_gettop(L);

+  if (n > 0) {  /* any result to be printed? */

+    luaL_checkstack(L, LUA_MINSTACK, "too many results to print");

+    lua_getglobal(L, "print");

+    lua_insert(L, 1);

+    if (lua_pcall(L, n, 0, 0) != LUA_OK)

+      l_message(progname, lua_pushfstring(L, "error calling 'print' (%s)",

+                                             lua_tostring(L, -1)));

+  }

+}

+

+

+/*

+** Do the REPL: repeatedly read (load) a line, evaluate (call) it, and

+** print any results.

+*/

+static void doREPL (lua_State *L) {

+  int status;

+  const char *oldprogname = progname;

+  progname = NULL;  /* no 'progname' on errors in interactive mode */

+  lua_initreadline(L);

+  while ((status = loadline(L)) != -1) {

+    if (status == LUA_OK)

+      status = docall(L, 0, LUA_MULTRET);

+    if (status == LUA_OK) l_print(L);

+    else report(L, status);

+  }

+  lua_settop(L, 0);  /* clear stack */

+  lua_writeline();

+  progname = oldprogname;

+}

+

+/* }================================================================== */

+

+

+/*

+** Main body of stand-alone interpreter (to be called in protected mode).

+** Reads the options and handles them all.

+*/

+static int pmain (lua_State *L) {

+  int argc = (int)lua_tointeger(L, 1);

+  char **argv = (char **)lua_touserdata(L, 2);

+  int script;

+  int args = collectargs(argv, &script);

+  luaL_checkversion(L);  /* check that interpreter has correct version */

+  if (argv[0] && argv[0][0]) progname = argv[0];

+  if (args == has_error) {  /* bad arg? */

+    print_usage(argv[script]);  /* 'script' has index of bad arg. */

+    return 0;

+  }

+  if (args & has_v)  /* option '-v'? */

+    print_version();

+  if (args & has_E) {  /* option '-E'? */

+    lua_pushboolean(L, 1);  /* signal for libraries to ignore env. vars. */

+    lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");

+  }

+  luaL_openlibs(L);  /* open standard libraries */

+  createargtable(L, argv, argc, script);  /* create table 'arg' */

+  lua_gc(L, LUA_GCGEN, 0, 0);  /* GC in generational mode */

+  if (!(args & has_E)) {  /* no option '-E'? */

+    if (handle_luainit(L) != LUA_OK)  /* run LUA_INIT */

+      return 0;  /* error running LUA_INIT */

+  }

+  if (!runargs(L, argv, script))  /* execute arguments -e and -l */

+    return 0;  /* something failed */

+  if (script < argc &&  /* execute main script (if there is one) */

+      handle_script(L, argv + script) != LUA_OK)

+    return 0;

+  if (args & has_i)  /* -i option? */

+    doREPL(L);  /* do read-eval-print loop */

+  else if (script == argc && !(args & (has_e | has_v))) {  /* no arguments? */

+    if (lua_stdin_is_tty()) {  /* running in interactive mode? */

+      print_version();

+      doREPL(L);  /* do read-eval-print loop */

+    }

+    else dofile(L, NULL);  /* executes stdin as a file */

+  }

+  lua_pushboolean(L, 1);  /* signal no errors */

+  return 1;

+}

+

+

+int main (int argc, char **argv) {

+  int status, result;

+  lua_State *L = luaL_newstate();  /* create state */

+  if (L == NULL) {

+    l_message(argv[0], "cannot create state: not enough memory");

+    return EXIT_FAILURE;

+  }

+  lua_pushcfunction(L, &pmain);  /* to call 'pmain' in protected mode */

+  lua_pushinteger(L, argc);  /* 1st argument */

+  lua_pushlightuserdata(L, argv); /* 2nd argument */

+  status = lua_pcall(L, 2, 1, 0);  /* do the call */

+  result = lua_toboolean(L, -1);  /* get result */

+  report(L, status);

+  lua_close(L);

+  return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE;

+}

+

--- /dev/null

+++ b/lua.h

@@ -1,0 +1,517 @@

+/*

+** $Id: lua.h $

+** Lua - A Scripting Language

+** Lua.org, PUC-Rio, Brazil (http://www.lua.org)

+** See Copyright Notice at the end of this file

+*/

+

+

+#ifndef lua_h

+#define lua_h

+

+#include <stdarg.h>

+#include <stddef.h>

+

+

+#include "luaconf.h"

+

+

+#define LUA_VERSION_MAJOR	"5"

+#define LUA_VERSION_MINOR	"4"

+#define LUA_VERSION_RELEASE	"2"

+

+#define LUA_VERSION_NUM			504

+#define LUA_VERSION_RELEASE_NUM		(LUA_VERSION_NUM * 100 + 0)

+

+#define LUA_VERSION	"Lua " LUA_VERSION_MAJOR "." LUA_VERSION_MINOR

+#define LUA_RELEASE	LUA_VERSION "." LUA_VERSION_RELEASE

+#define LUA_COPYRIGHT	LUA_RELEASE "  Copyright (C) 1994-2020 Lua.org, PUC-Rio"

+#define LUA_AUTHORS	"R. Ierusalimschy, L. H. de Figueiredo, W. Celes"

+

+

+/* mark for precompiled code ('<esc>Lua') */

+#define LUA_SIGNATURE	"\x1bLua"

+

+/* option for multiple returns in 'lua_pcall' and 'lua_call' */

+#define LUA_MULTRET	(-1)

+

+

+/*

+** Pseudo-indices

+** (-LUAI_MAXSTACK is the minimum valid index; we keep some free empty

+** space after that to help overflow detection)

+*/

+#define LUA_REGISTRYINDEX	(-LUAI_MAXSTACK - 1000)

+#define lua_upvalueindex(i)	(LUA_REGISTRYINDEX - (i))

+

+

+/* thread status */

+#define LUA_OK		0

+#define LUA_YIELD	1

+#define LUA_ERRRUN	2

+#define LUA_ERRSYNTAX	3

+#define LUA_ERRMEM	4

+#define LUA_ERRERR	5

+

+

+typedef struct lua_State lua_State;

+

+

+/*

+** basic types

+*/

+#define LUA_TNONE		(-1)

+

+#define LUA_TNIL		0

+#define LUA_TBOOLEAN		1

+#define LUA_TLIGHTUSERDATA	2

+#define LUA_TNUMBER		3

+#define LUA_TSTRING		4

+#define LUA_TTABLE		5

+#define LUA_TFUNCTION		6

+#define LUA_TUSERDATA		7

+#define LUA_TTHREAD		8

+

+#define LUA_NUMTYPES		9

+

+

+

+/* minimum Lua stack available to a C function */

+#define LUA_MINSTACK	20

+

+

+/* predefined values in the registry */

+#define LUA_RIDX_MAINTHREAD	1

+#define LUA_RIDX_GLOBALS	2

+#define LUA_RIDX_LAST		LUA_RIDX_GLOBALS

+

+

+/* type of numbers in Lua */

+typedef LUA_NUMBER lua_Number;

+

+

+/* type for integer functions */

+typedef LUA_INTEGER lua_Integer;

+

+/* unsigned integer type */

+typedef LUA_UNSIGNED lua_Unsigned;

+

+/* type for continuation-function contexts */

+typedef LUA_KCONTEXT lua_KContext;

+

+

+/*

+** Type for C functions registered with Lua

+*/

+typedef int (*lua_CFunction) (lua_State *L);

+

+/*

+** Type for continuation functions

+*/

+typedef int (*lua_KFunction) (lua_State *L, int status, lua_KContext ctx);

+

+

+/*

+** Type for functions that read/write blocks when loading/dumping Lua chunks

+*/

+typedef const char * (*lua_Reader) (lua_State *L, void *ud, size_t *sz);

+

+typedef int (*lua_Writer) (lua_State *L, const void *p, size_t sz, void *ud);

+

+

+/*

+** Type for memory-allocation functions

+*/

+typedef void * (*lua_Alloc) (void *ud, void *ptr, size_t osize, size_t nsize);

+

+

+/*

+** Type for warning functions

+*/

+typedef void (*lua_WarnFunction) (void *ud, const char *msg, int tocont);

+

+

+

+

+/*

+** generic extra include file

+*/

+#if defined(LUA_USER_H)

+#include LUA_USER_H

+#endif

+

+

+/*

+** RCS ident string

+*/

+extern const char lua_ident[];

+

+

+/*

+** state manipulation

+*/

+LUA_API lua_State *(lua_newstate) (lua_Alloc f, void *ud);

+LUA_API void       (lua_close) (lua_State *L);

+LUA_API lua_State *(lua_newthread) (lua_State *L);

+LUA_API int        (lua_resetthread) (lua_State *L);

+

+LUA_API lua_CFunction (lua_atpanic) (lua_State *L, lua_CFunction panicf);

+

+

+LUA_API lua_Number (lua_version) (lua_State *L);

+

+

+/*

+** basic stack manipulation

+*/

+LUA_API int   (lua_absindex) (lua_State *L, int idx);

+LUA_API int   (lua_gettop) (lua_State *L);

+LUA_API void  (lua_settop) (lua_State *L, int idx);

+LUA_API void  (lua_pushvalue) (lua_State *L, int idx);

+LUA_API void  (lua_rotate) (lua_State *L, int idx, int n);

+LUA_API void  (lua_copy) (lua_State *L, int fromidx, int toidx);

+LUA_API int   (lua_checkstack) (lua_State *L, int n);

+

+LUA_API void  (lua_xmove) (lua_State *from, lua_State *to, int n);

+

+

+/*

+** access functions (stack -> C)

+*/

+

+LUA_API int             (lua_isnumber) (lua_State *L, int idx);

+LUA_API int             (lua_isstring) (lua_State *L, int idx);

+LUA_API int             (lua_iscfunction) (lua_State *L, int idx);

+LUA_API int             (lua_isinteger) (lua_State *L, int idx);

+LUA_API int             (lua_isuserdata) (lua_State *L, int idx);

+LUA_API int             (lua_type) (lua_State *L, int idx);

+LUA_API const char     *(lua_typename) (lua_State *L, int tp);

+

+LUA_API lua_Number      (lua_tonumberx) (lua_State *L, int idx, int *isnum);

+LUA_API lua_Integer     (lua_tointegerx) (lua_State *L, int idx, int *isnum);

+LUA_API int             (lua_toboolean) (lua_State *L, int idx);

+LUA_API const char     *(lua_tolstring) (lua_State *L, int idx, size_t *len);

+LUA_API lua_Unsigned    (lua_rawlen) (lua_State *L, int idx);

+LUA_API lua_CFunction   (lua_tocfunction) (lua_State *L, int idx);

+LUA_API void	       *(lua_touserdata) (lua_State *L, int idx);

+LUA_API lua_State      *(lua_tothread) (lua_State *L, int idx);

+LUA_API const void     *(lua_topointer) (lua_State *L, int idx);

+

+

+/*

+** Comparison and arithmetic functions

+*/

+

+#define LUA_OPADD	0	/* ORDER TM, ORDER OP */

+#define LUA_OPSUB	1

+#define LUA_OPMUL	2

+#define LUA_OPMOD	3

+#define LUA_OPPOW	4

+#define LUA_OPDIV	5

+#define LUA_OPIDIV	6

+#define LUA_OPBAND	7

+#define LUA_OPBOR	8

+#define LUA_OPBXOR	9

+#define LUA_OPSHL	10

+#define LUA_OPSHR	11

+#define LUA_OPUNM	12

+#define LUA_OPBNOT	13

+

+LUA_API void  (lua_arith) (lua_State *L, int op);

+

+#define LUA_OPEQ	0

+#define LUA_OPLT	1

+#define LUA_OPLE	2

+

+LUA_API int   (lua_rawequal) (lua_State *L, int idx1, int idx2);

+LUA_API int   (lua_compare) (lua_State *L, int idx1, int idx2, int op);

+

+

+/*

+** push functions (C -> stack)

+*/

+LUA_API void        (lua_pushnil) (lua_State *L);

+LUA_API void        (lua_pushnumber) (lua_State *L, lua_Number n);

+LUA_API void        (lua_pushinteger) (lua_State *L, lua_Integer n);

+LUA_API const char *(lua_pushlstring) (lua_State *L, const char *s, size_t len);

+LUA_API const char *(lua_pushstring) (lua_State *L, const char *s);

+LUA_API const char *(lua_pushvfstring) (lua_State *L, const char *fmt,

+                                                      va_list argp);

+LUA_API const char *(lua_pushfstring) (lua_State *L, const char *fmt, ...);

+LUA_API void  (lua_pushcclosure) (lua_State *L, lua_CFunction fn, int n);

+LUA_API void  (lua_pushboolean) (lua_State *L, int b);

+LUA_API void  (lua_pushlightuserdata) (lua_State *L, void *p);

+LUA_API int   (lua_pushthread) (lua_State *L);

+

+

+/*

+** get functions (Lua -> stack)

+*/

+LUA_API int (lua_getglobal) (lua_State *L, const char *name);

+LUA_API int (lua_gettable) (lua_State *L, int idx);

+LUA_API int (lua_getfield) (lua_State *L, int idx, const char *k);

+LUA_API int (lua_geti) (lua_State *L, int idx, lua_Integer n);

+LUA_API int (lua_rawget) (lua_State *L, int idx);

+LUA_API int (lua_rawgeti) (lua_State *L, int idx, lua_Integer n);

+LUA_API int (lua_rawgetp) (lua_State *L, int idx, const void *p);

+

+LUA_API void  (lua_createtable) (lua_State *L, int narr, int nrec);

+LUA_API void *(lua_newuserdatauv) (lua_State *L, size_t sz, int nuvalue);

+LUA_API int   (lua_getmetatable) (lua_State *L, int objindex);

+LUA_API int  (lua_getiuservalue) (lua_State *L, int idx, int n);

+

+

+/*

+** set functions (stack -> Lua)

+*/

+LUA_API void  (lua_setglobal) (lua_State *L, const char *name);

+LUA_API void  (lua_settable) (lua_State *L, int idx);

+LUA_API void  (lua_setfield) (lua_State *L, int idx, const char *k);

+LUA_API void  (lua_seti) (lua_State *L, int idx, lua_Integer n);

+LUA_API void  (lua_rawset) (lua_State *L, int idx);

+LUA_API void  (lua_rawseti) (lua_State *L, int idx, lua_Integer n);

+LUA_API void  (lua_rawsetp) (lua_State *L, int idx, const void *p);

+LUA_API int   (lua_setmetatable) (lua_State *L, int objindex);

+LUA_API int   (lua_setiuservalue) (lua_State *L, int idx, int n);

+

+

+/*

+** 'load' and 'call' functions (load and run Lua code)

+*/

+LUA_API void  (lua_callk) (lua_State *L, int nargs, int nresults,

+                           lua_KContext ctx, lua_KFunction k);

+#define lua_call(L,n,r)		lua_callk(L, (n), (r), 0, NULL)

+

+LUA_API int   (lua_pcallk) (lua_State *L, int nargs, int nresults, int errfunc,

+                            lua_KContext ctx, lua_KFunction k);

+#define lua_pcall(L,n,r,f)	lua_pcallk(L, (n), (r), (f), 0, NULL)

+

+LUA_API int   (lua_load) (lua_State *L, lua_Reader reader, void *dt,

+                          const char *chunkname, const char *mode);

+

+LUA_API int (lua_dump) (lua_State *L, lua_Writer writer, void *data, int strip);

+

+

+/*

+** coroutine functions

+*/

+LUA_API int  (lua_yieldk)     (lua_State *L, int nresults, lua_KContext ctx,

+                               lua_KFunction k);

+LUA_API int  (lua_resume)     (lua_State *L, lua_State *from, int narg,

+                               int *nres);

+LUA_API int  (lua_status)     (lua_State *L);

+LUA_API int (lua_isyieldable) (lua_State *L);

+

+#define lua_yield(L,n)		lua_yieldk(L, (n), 0, NULL)

+

+

+/*

+** Warning-related functions

+*/

+LUA_API void (lua_setwarnf) (lua_State *L, lua_WarnFunction f, void *ud);

+LUA_API void (lua_warning)  (lua_State *L, const char *msg, int tocont);

+

+

+/*

+** garbage-collection function and options

+*/

+

+#define LUA_GCSTOP		0

+#define LUA_GCRESTART		1

+#define LUA_GCCOLLECT		2

+#define LUA_GCCOUNT		3

+#define LUA_GCCOUNTB		4

+#define LUA_GCSTEP		5

+#define LUA_GCSETPAUSE		6

+#define LUA_GCSETSTEPMUL	7

+#define LUA_GCISRUNNING		9

+#define LUA_GCGEN		10

+#define LUA_GCINC		11

+

+LUA_API int (lua_gc) (lua_State *L, int what, ...);

+

+

+/*

+** miscellaneous functions

+*/

+

+LUA_API int   (lua_error) (lua_State *L);

+

+LUA_API int   (lua_next) (lua_State *L, int idx);

+

+LUA_API void  (lua_concat) (lua_State *L, int n);

+LUA_API void  (lua_len)    (lua_State *L, int idx);

+

+LUA_API size_t   (lua_stringtonumber) (lua_State *L, const char *s);

+

+LUA_API lua_Alloc (lua_getallocf) (lua_State *L, void **ud);

+LUA_API void      (lua_setallocf) (lua_State *L, lua_Alloc f, void *ud);

+

+LUA_API void  (lua_toclose) (lua_State *L, int idx);

+

+

+/*

+** {==============================================================

+** some useful macros

+** ===============================================================

+*/

+

+#define lua_getextraspace(L)	((void *)((char *)(L) - LUA_EXTRASPACE))

+

+#define lua_tonumber(L,i)	lua_tonumberx(L,(i),NULL)

+#define lua_tointeger(L,i)	lua_tointegerx(L,(i),NULL)

+

+#define lua_pop(L,n)		lua_settop(L, -(n)-1)

+

+#define lua_newtable(L)		lua_createtable(L, 0, 0)

+

+#define lua_register(L,n,f) (lua_pushcfunction(L, (f)), lua_setglobal(L, (n)))

+

+#define lua_pushcfunction(L,f)	lua_pushcclosure(L, (f), 0)

+

+#define lua_isfunction(L,n)	(lua_type(L, (n)) == LUA_TFUNCTION)

+#define lua_istable(L,n)	(lua_type(L, (n)) == LUA_TTABLE)

+#define lua_islightuserdata(L,n)	(lua_type(L, (n)) == LUA_TLIGHTUSERDATA)

+#define lua_isnil(L,n)		(lua_type(L, (n)) == LUA_TNIL)

+#define lua_isboolean(L,n)	(lua_type(L, (n)) == LUA_TBOOLEAN)

+#define lua_isthread(L,n)	(lua_type(L, (n)) == LUA_TTHREAD)

+#define lua_isnone(L,n)		(lua_type(L, (n)) == LUA_TNONE)

+#define lua_isnoneornil(L, n)	(lua_type(L, (n)) <= 0)

+

+#define lua_pushliteral(L, s)	lua_pushstring(L, "" s)

+

+#define lua_pushglobaltable(L)  \

+	((void)lua_rawgeti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS))

+

+#define lua_tostring(L,i)	lua_tolstring(L, (i), NULL)

+

+

+#define lua_insert(L,idx)	lua_rotate(L, (idx), 1)

+

+#define lua_remove(L,idx)	(lua_rotate(L, (idx), -1), lua_pop(L, 1))

+

+#define lua_replace(L,idx)	(lua_copy(L, -1, (idx)), lua_pop(L, 1))

+

+/* }============================================================== */

+

+

+/*

+** {==============================================================

+** compatibility macros

+** ===============================================================

+*/

+#if defined(LUA_COMPAT_APIINTCASTS)

+

+#define lua_pushunsigned(L,n)	lua_pushinteger(L, (lua_Integer)(n))

+#define lua_tounsignedx(L,i,is)	((lua_Unsigned)lua_tointegerx(L,i,is))

+#define lua_tounsigned(L,i)	lua_tounsignedx(L,(i),NULL)

+

+#endif

+

+#define lua_newuserdata(L,s)	lua_newuserdatauv(L,s,1)

+#define lua_getuservalue(L,idx)	lua_getiuservalue(L,idx,1)

+#define lua_setuservalue(L,idx)	lua_setiuservalue(L,idx,1)

+

+#define LUA_NUMTAGS		LUA_NUMTYPES

+

+/* }============================================================== */

+

+/*

+** {======================================================================

+** Debug API

+** =======================================================================

+*/

+

+

+/*

+** Event codes

+*/

+#define LUA_HOOKCALL	0

+#define LUA_HOOKRET	1

+#define LUA_HOOKLINE	2

+#define LUA_HOOKCOUNT	3

+#define LUA_HOOKTAILCALL 4

+

+

+/*

+** Event masks

+*/

+#define LUA_MASKCALL	(1 << LUA_HOOKCALL)

+#define LUA_MASKRET	(1 << LUA_HOOKRET)

+#define LUA_MASKLINE	(1 << LUA_HOOKLINE)

+#define LUA_MASKCOUNT	(1 << LUA_HOOKCOUNT)

+

+typedef struct lua_Debug lua_Debug;  /* activation record */

+

+

+/* Functions to be called by the debugger in specific events */

+typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar);

+

+

+LUA_API int (lua_getstack) (lua_State *L, int level, lua_Debug *ar);

+LUA_API int (lua_getinfo) (lua_State *L, const char *what, lua_Debug *ar);

+LUA_API const char *(lua_getlocal) (lua_State *L, const lua_Debug *ar, int n);

+LUA_API const char *(lua_setlocal) (lua_State *L, const lua_Debug *ar, int n);

+LUA_API const char *(lua_getupvalue) (lua_State *L, int funcindex, int n);

+LUA_API const char *(lua_setupvalue) (lua_State *L, int funcindex, int n);

+

+LUA_API void *(lua_upvalueid) (lua_State *L, int fidx, int n);

+LUA_API void  (lua_upvaluejoin) (lua_State *L, int fidx1, int n1,

+                                               int fidx2, int n2);

+

+LUA_API void (lua_sethook) (lua_State *L, lua_Hook func, int mask, int count);

+LUA_API lua_Hook (lua_gethook) (lua_State *L);

+LUA_API int (lua_gethookmask) (lua_State *L);

+LUA_API int (lua_gethookcount) (lua_State *L);

+

+LUA_API int (lua_setcstacklimit) (lua_State *L, unsigned int limit);

+

+struct lua_Debug {

+  int event;

+  const char *name;	/* (n) */

+  const char *namewhat;	/* (n) 'global', 'local', 'field', 'method' */

+  const char *what;	/* (S) 'Lua', 'C', 'main', 'tail' */

+  const char *source;	/* (S) */

+  size_t srclen;	/* (S) */

+  int currentline;	/* (l) */

+  int linedefined;	/* (S) */

+  int lastlinedefined;	/* (S) */

+  unsigned char nups;	/* (u) number of upvalues */

+  unsigned char nparams;/* (u) number of parameters */

+  char isvararg;        /* (u) */

+  char istailcall;	/* (t) */

+  unsigned short ftransfer;   /* (r) index of first value transferred */

+  unsigned short ntransfer;   /* (r) number of transferred values */

+  char short_src[LUA_IDSIZE]; /* (S) */

+  /* private part */

+  struct CallInfo *i_ci;  /* active function */

+};

+

+/* }====================================================================== */

+

+

+/******************************************************************************

+* Copyright (C) 1994-2020 Lua.org, PUC-Rio.

+*

+* Permission is hereby granted, free of charge, to any person obtaining

+* a copy of this software and associated documentation files (the

+* "Software"), to deal in the Software without restriction, including

+* without limitation the rights to use, copy, modify, merge, publish,

+* distribute, sublicense, and/or sell copies of the Software, and to

+* permit persons to whom the Software is furnished to do so, subject to

+* the following conditions:

+*

+* The above copyright notice and this permission notice shall be

+* included in all copies or substantial portions of the Software.

+*

+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

+******************************************************************************/

+

+

+#endif

--- /dev/null

+++ b/lua.hpp

@@ -1,0 +1,9 @@

+// lua.hpp

+// Lua header files for C++

+// <<extern "C">> not supplied automatically because Lua also compiles as C++

+

+extern "C" {

+#include "lua.h"

+#include "lualib.h"

+#include "lauxlib.h"

+}

--- /dev/null

+++ b/luac.c

@@ -1,0 +1,724 @@

+/*

+** $Id: luac.c $

+** Lua compiler (saves bytecodes to files; also lists bytecodes)

+** See Copyright Notice in lua.h

+*/

+

+#define luac_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+#include <ctype.h>

+#include <errno.h>

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+

+#include "lua.h"

+#include "lauxlib.h"

+

+#include "ldebug.h"

+#include "lobject.h"

+#include "lopcodes.h"

+#include "lopnames.h"

+#include "lstate.h"

+#include "lundump.h"

+

+static void PrintFunction(const Proto* f, int full);

+#define luaU_print	PrintFunction

+

+#define PROGNAME	"luac"		/* default program name */

+#define OUTPUT		PROGNAME ".out"	/* default output file */

+

+static int listing=0;			/* list bytecodes? */

+static int dumping=1;			/* dump bytecodes? */

+static int stripping=0;			/* strip debug information? */

+static char Output[]={ OUTPUT };	/* default output file name */

+static const char* output=Output;	/* actual output file name */

+static const char* progname=PROGNAME;	/* actual program name */

+static TString **tmname;

+

+static void fatal(const char* message)

+{

+ fprintf(stderr,"%s: %s\n",progname,message);

+ exit(EXIT_FAILURE);

+}

+

+static void cannot(const char* what)

+{

+ fprintf(stderr,"%s: cannot %s %s: %s\n",progname,what,output,strerror(errno));

+ exit(EXIT_FAILURE);

+}

+

+static void usage(const char* message)

+{

+ if (*message=='-')

+  fprintf(stderr,"%s: unrecognized option '%s'\n",progname,message);

+ else

+  fprintf(stderr,"%s: %s\n",progname,message);

+ fprintf(stderr,

+  "usage: %s [options] [filenames]\n"

+  "Available options are:\n"

+  "  -l       list (use -l -l for full listing)\n"

+  "  -o name  output to file 'name' (default is \"%s\")\n"

+  "  -p       parse only\n"

+  "  -s       strip debug information\n"

+  "  -v       show version information\n"

+  "  --       stop handling options\n"

+  "  -        stop handling options and process stdin\n"

+  ,progname,Output);

+ exit(EXIT_FAILURE);

+}

+

+#define IS(s)	(strcmp(argv[i],s)==0)

+

+static int doargs(int argc, char* argv[])

+{

+ int i;

+ int version=0;

+ if (argv[0]!=NULL && *argv[0]!=0) progname=argv[0];

+ for (i=1; i<argc; i++)

+ {

+  if (*argv[i]!='-')			/* end of options; keep it */

+   break;

+  else if (IS("--"))			/* end of options; skip it */

+  {

+   ++i;

+   if (version) ++version;

+   break;

+  }

+  else if (IS("-"))			/* end of options; use stdin */

+   break;

+  else if (IS("-l"))			/* list */

+   ++listing;

+  else if (IS("-o"))			/* output file */

+  {

+   output=argv[++i];

+   if (output==NULL || *output==0 || (*output=='-' && output[1]!=0))

+    usage("'-o' needs argument");

+   if (IS("-")) output=NULL;

+  }

+  else if (IS("-p"))			/* parse only */

+   dumping=0;

+  else if (IS("-s"))			/* strip debug information */

+   stripping=1;

+  else if (IS("-v"))			/* show version */

+   ++version;

+  else					/* unknown option */

+   usage(argv[i]);

+ }

+ if (i==argc && (listing || !dumping))

+ {

+  dumping=0;

+  argv[--i]=Output;

+ }

+ if (version)

+ {

+  printf("%s\n",LUA_COPYRIGHT);

+  if (version==argc-1) exit(EXIT_SUCCESS);

+ }

+ return i;

+}

+

+#define FUNCTION "(function()end)();"

+

+static const char* reader(lua_State* L, void* ud, size_t* size)

+{

+ UNUSED(L);

+ if ((*(int*)ud)--)

+ {

+  *size=sizeof(FUNCTION)-1;

+  return FUNCTION;

+ }

+ else

+ {

+  *size=0;

+  return NULL;

+ }

+}

+

+#define toproto(L,i) getproto(s2v(L->top+(i)))

+

+static const Proto* combine(lua_State* L, int n)

+{

+ if (n==1)

+  return toproto(L,-1);

+ else

+ {

+  Proto* f;

+  int i=n;

+  if (lua_load(L,reader,&i,"=(" PROGNAME ")",NULL)!=LUA_OK) fatal(lua_tostring(L,-1));

+  f=toproto(L,-1);

+  for (i=0; i<n; i++)

+  {

+   f->p[i]=toproto(L,i-n-1);

+   if (f->p[i]->sizeupvalues>0) f->p[i]->upvalues[0].instack=0;

+  }

+  f->sizelineinfo=0;

+  return f;

+ }

+}

+

+static int writer(lua_State* L, const void* p, size_t size, void* u)

+{

+ UNUSED(L);

+ return (fwrite(p,size,1,(FILE*)u)!=1) && (size!=0);

+}

+

+static int pmain(lua_State* L)

+{

+ int argc=(int)lua_tointeger(L,1);

+ char** argv=(char**)lua_touserdata(L,2);

+ const Proto* f;

+ int i;

+ tmname=G(L)->tmname;

+ if (!lua_checkstack(L,argc)) fatal("too many input files");

+ for (i=0; i<argc; i++)

+ {

+  const char* filename=IS("-") ? NULL : argv[i];

+  if (luaL_loadfile(L,filename)!=LUA_OK) fatal(lua_tostring(L,-1));

+ }

+ f=combine(L,argc);

+ if (listing) luaU_print(f,listing>1);

+ if (dumping)

+ {

+  FILE* D= (output==NULL) ? stdout : fopen(output,"wb");

+  if (D==NULL) cannot("open");

+  lua_lock(L);

+  luaU_dump(L,f,writer,D,stripping);

+  lua_unlock(L);

+  if (ferror(D)) cannot("write");

+  if (fclose(D)) cannot("close");

+ }

+ return 0;

+}

+

+int main(int argc, char* argv[])

+{

+ lua_State* L;

+ int i=doargs(argc,argv);

+ argc-=i; argv+=i;

+ if (argc<=0) usage("no input files given");

+ L=luaL_newstate();

+ if (L==NULL) fatal("cannot create state: not enough memory");

+ lua_pushcfunction(L,&pmain);

+ lua_pushinteger(L,argc);

+ lua_pushlightuserdata(L,argv);

+ if (lua_pcall(L,2,0,0)!=LUA_OK) fatal(lua_tostring(L,-1));

+ lua_close(L);

+ return EXIT_SUCCESS;

+}

+

+/*

+** print bytecodes

+*/

+

+#define UPVALNAME(x) ((f->upvalues[x].name) ? getstr(f->upvalues[x].name) : "-")

+#define VOID(p) ((const void*)(p))

+#define eventname(i) (getstr(tmname[i]))

+

+static void PrintString(const TString* ts)

+{

+ const char* s=getstr(ts);

+ size_t i,n=tsslen(ts);

+ printf("\"");

+ for (i=0; i<n; i++)

+ {

+  int c=(int)(unsigned char)s[i];

+  switch (c)

+  {

+   case '"':

+	printf("\\\"");

+	break;

+   case '\\':

+	printf("\\\\");

+	break;

+   case '\a':

+	printf("\\a");

+	break;

+   case '\b':

+	printf("\\b");

+	break;

+   case '\f':

+	printf("\\f");

+	break;

+   case '\n':

+	printf("\\n");

+	break;

+   case '\r':

+	printf("\\r");

+	break;

+   case '\t':

+	printf("\\t");

+	break;

+   case '\v':

+	printf("\\v");

+	break;

+   default:

+	if (isprint(c)) printf("%c",c); else printf("\\%03d",c);

+	break;

+  }

+ }

+ printf("\"");

+}

+

+static void PrintType(const Proto* f, int i)

+{

+ const TValue* o=&f->k[i];

+ switch (ttypetag(o))

+ {

+  case LUA_VNIL:

+	printf("N");

+	break;

+  case LUA_VFALSE:

+  case LUA_VTRUE:

+	printf("B");

+	break;

+  case LUA_VNUMFLT:

+	printf("F");

+	break;

+  case LUA_VNUMINT:

+	printf("I");

+	break;

+  case LUA_VSHRSTR:

+  case LUA_VLNGSTR:

+	printf("S");

+	break;

+  default:				/* cannot happen */

+	printf("?%d",ttypetag(o));

+	break;

+ }

+ printf("\t");

+}

+

+static void PrintConstant(const Proto* f, int i)

+{

+ const TValue* o=&f->k[i];

+ switch (ttypetag(o))

+ {

+  case LUA_VNIL:

+	printf("nil");

+	break;

+  case LUA_VFALSE:

+	printf("false");

+	break;

+  case LUA_VTRUE:

+	printf("true");

+	break;

+  case LUA_VNUMFLT:

+	{

+	char buff[100];

+	sprintf(buff,LUA_NUMBER_FMT,fltvalue(o));

+	printf("%s",buff);

+	if (buff[strspn(buff,"-0123456789")]=='\0') printf(".0");

+	break;

+	}

+  case LUA_VNUMINT:

+	printf(LUA_INTEGER_FMT,ivalue(o));

+	break;

+  case LUA_VSHRSTR:

+  case LUA_VLNGSTR:

+	PrintString(tsvalue(o));

+	break;

+  default:				/* cannot happen */

+	printf("?%d",ttypetag(o));

+	break;

+ }

+}

+

+#define COMMENT		"\t; "

+#define EXTRAARG	GETARG_Ax(code[pc+1])

+#define EXTRAARGC	(EXTRAARG*(MAXARG_C+1))

+#define ISK		(isk ? "k" : "")

+

+static void PrintCode(const Proto* f)

+{

+ const Instruction* code=f->code;

+ int pc,n=f->sizecode;

+ for (pc=0; pc<n; pc++)

+ {

+  Instruction i=code[pc];

+  OpCode o=GET_OPCODE(i);

+  int a=GETARG_A(i);

+  int b=GETARG_B(i);

+  int c=GETARG_C(i);

+  int ax=GETARG_Ax(i);

+  int bx=GETARG_Bx(i);

+  int sb=GETARG_sB(i);

+  int sc=GETARG_sC(i);

+  int sbx=GETARG_sBx(i);

+  int isk=GETARG_k(i);

+  int line=luaG_getfuncline(f,pc);

+  printf("\t%d\t",pc+1);

+  if (line>0) printf("[%d]\t",line); else printf("[-]\t");

+  printf("%-9s\t",opnames[o]);

+  switch (o)

+  {

+   case OP_MOVE:

+	printf("%d %d",a,b);

+	break;

+   case OP_LOADI:

+	printf("%d %d",a,sbx);

+	break;

+   case OP_LOADF:

+	printf("%d %d",a,sbx);

+	break;

+   case OP_LOADK:

+	printf("%d %d",a,bx);

+	printf(COMMENT); PrintConstant(f,bx);

+	break;

+   case OP_LOADKX:

+	printf("%d",a);

+	printf(COMMENT); PrintConstant(f,EXTRAARG);

+	break;

+   case OP_LOADFALSE:

+	printf("%d",a);

+	break;

+   case OP_LFALSESKIP:

+	printf("%d",a);

+	break;

+   case OP_LOADTRUE:

+	printf("%d",a);

+	break;

+   case OP_LOADNIL:

+	printf("%d %d",a,b);

+	printf(COMMENT "%d out",b+1);

+	break;

+   case OP_GETUPVAL:

+	printf("%d %d",a,b);

+	printf(COMMENT "%s",UPVALNAME(b));

+	break;

+   case OP_SETUPVAL:

+	printf("%d %d",a,b);

+	printf(COMMENT "%s",UPVALNAME(b));

+	break;

+   case OP_GETTABUP:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT "%s",UPVALNAME(b));

+	printf(" "); PrintConstant(f,c);

+	break;

+   case OP_GETTABLE:

+	printf("%d %d %d",a,b,c);

+	break;

+   case OP_GETI:

+	printf("%d %d %d",a,b,c);

+	break;

+   case OP_GETFIELD:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT); PrintConstant(f,c);

+	break;

+   case OP_SETTABUP:

+	printf("%d %d %d%s",a,b,c,ISK);

+	printf(COMMENT "%s",UPVALNAME(a));

+	printf(" "); PrintConstant(f,b);

+	if (isk) { printf(" "); PrintConstant(f,c); }

+	break;

+   case OP_SETTABLE:

+	printf("%d %d %d%s",a,b,c,ISK);

+	if (isk) { printf(COMMENT); PrintConstant(f,c); }

+	break;

+   case OP_SETI:

+	printf("%d %d %d%s",a,b,c,ISK);

+	if (isk) { printf(COMMENT); PrintConstant(f,c); }

+	break;

+   case OP_SETFIELD:

+	printf("%d %d %d%s",a,b,c,ISK);

+	printf(COMMENT); PrintConstant(f,b);

+	if (isk) { printf(" "); PrintConstant(f,c); }

+	break;

+   case OP_NEWTABLE:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT "%d",c+EXTRAARGC);

+	break;

+   case OP_SELF:

+	printf("%d %d %d%s",a,b,c,ISK);

+	if (isk) { printf(COMMENT); PrintConstant(f,c); }

+	break;

+   case OP_ADDI:

+	printf("%d %d %d",a,b,sc);

+	break;

+   case OP_ADDK:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT); PrintConstant(f,c);

+	break;

+   case OP_SUBK:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT); PrintConstant(f,c);

+	break;

+   case OP_MULK:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT); PrintConstant(f,c);

+	break;

+   case OP_MODK:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT); PrintConstant(f,c);

+	break;

+   case OP_POWK:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT); PrintConstant(f,c);

+	break;

+   case OP_DIVK:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT); PrintConstant(f,c);

+	break;

+   case OP_IDIVK:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT); PrintConstant(f,c);

+	break;

+   case OP_BANDK:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT); PrintConstant(f,c);

+	break;

+   case OP_BORK:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT); PrintConstant(f,c);

+	break;

+   case OP_BXORK:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT); PrintConstant(f,c);

+	break;

+   case OP_SHRI:

+	printf("%d %d %d",a,b,sc);

+	break;

+   case OP_SHLI:

+	printf("%d %d %d",a,b,sc);

+	break;

+   case OP_ADD:

+	printf("%d %d %d",a,b,c);

+	break;

+   case OP_SUB:

+	printf("%d %d %d",a,b,c);

+	break;

+   case OP_MUL:

+	printf("%d %d %d",a,b,c);

+	break;

+   case OP_MOD:

+	printf("%d %d %d",a,b,c);

+	break;

+   case OP_POW:

+	printf("%d %d %d",a,b,c);

+	break;

+   case OP_DIV:

+	printf("%d %d %d",a,b,c);

+	break;

+   case OP_IDIV:

+	printf("%d %d %d",a,b,c);

+	break;

+   case OP_BAND:

+	printf("%d %d %d",a,b,c);

+	break;

+   case OP_BOR:

+	printf("%d %d %d",a,b,c);

+	break;

+   case OP_BXOR:

+	printf("%d %d %d",a,b,c);

+	break;

+   case OP_SHL:

+	printf("%d %d %d",a,b,c);

+	break;

+   case OP_SHR:

+	printf("%d %d %d",a,b,c);

+	break;

+   case OP_MMBIN:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT "%s",eventname(c));

+	break;

+   case OP_MMBINI:

+	printf("%d %d %d %d",a,sb,c,isk);

+	printf(COMMENT "%s",eventname(c));

+	if (isk) printf(" flip");

+	break;

+   case OP_MMBINK:

+	printf("%d %d %d %d",a,b,c,isk);

+	printf(COMMENT "%s ",eventname(c)); PrintConstant(f,b);

+	if (isk) printf(" flip");

+	break;

+   case OP_UNM:

+	printf("%d %d",a,b);

+	break;

+   case OP_BNOT:

+	printf("%d %d",a,b);

+	break;

+   case OP_NOT:

+	printf("%d %d",a,b);

+	break;

+   case OP_LEN:

+	printf("%d %d",a,b);

+	break;

+   case OP_CONCAT:

+	printf("%d %d",a,b);

+	break;

+   case OP_CLOSE:

+	printf("%d",a);

+	break;

+   case OP_TBC:

+	printf("%d",a);

+	break;

+   case OP_JMP:

+	printf("%d",GETARG_sJ(i));

+	printf(COMMENT "to %d",GETARG_sJ(i)+pc+2);

+	break;

+   case OP_EQ:

+	printf("%d %d %d",a,b,isk);

+	break;

+   case OP_LT:

+	printf("%d %d %d",a,b,isk);

+	break;

+   case OP_LE:

+	printf("%d %d %d",a,b,isk);

+	break;

+   case OP_EQK:

+	printf("%d %d %d",a,b,isk);

+	printf(COMMENT); PrintConstant(f,b);

+	break;

+   case OP_EQI:

+	printf("%d %d %d",a,sb,isk);

+	break;

+   case OP_LTI:

+	printf("%d %d %d",a,sb,isk);

+	break;

+   case OP_LEI:

+	printf("%d %d %d",a,sb,isk);

+	break;

+   case OP_GTI:

+	printf("%d %d %d",a,sb,isk);

+	break;

+   case OP_GEI:

+	printf("%d %d %d",a,sb,isk);

+	break;

+   case OP_TEST:

+	printf("%d %d",a,isk);

+	break;

+   case OP_TESTSET:

+	printf("%d %d %d",a,b,isk);

+	break;

+   case OP_CALL:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT);

+	if (b==0) printf("all in "); else printf("%d in ",b-1);

+	if (c==0) printf("all out"); else printf("%d out",c-1);

+	break;

+   case OP_TAILCALL:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT "%d in",b-1);

+	break;

+   case OP_RETURN:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT);

+	if (b==0) printf("all out"); else printf("%d out",b-1);

+	break;

+   case OP_RETURN0:

+	break;

+   case OP_RETURN1:

+	printf("%d",a);

+	break;

+   case OP_FORLOOP:

+	printf("%d %d",a,bx);

+	printf(COMMENT "to %d",pc-bx+2);

+	break;

+   case OP_FORPREP:

+	printf("%d %d",a,bx);

+	printf(COMMENT "to %d",pc+bx+2);

+	break;

+   case OP_TFORPREP:

+	printf("%d %d",a,bx);

+	printf(COMMENT "to %d",pc+bx+2);

+	break;

+   case OP_TFORCALL:

+	printf("%d %d",a,c);

+	break;

+   case OP_TFORLOOP:

+	printf("%d %d",a,bx);

+	printf(COMMENT "to %d",pc-bx+2);

+	break;

+   case OP_SETLIST:

+	printf("%d %d %d",a,b,c);

+	if (isk) printf(COMMENT "%d",c+EXTRAARGC);

+	break;

+   case OP_CLOSURE:

+	printf("%d %d",a,bx);

+	printf(COMMENT "%p",VOID(f->p[bx]));

+	break;

+   case OP_VARARG:

+	printf("%d %d",a,c);

+	printf(COMMENT);

+	if (c==0) printf("all out"); else printf("%d out",c-1);

+	break;

+   case OP_VARARGPREP:

+	printf("%d",a);

+	break;

+   case OP_EXTRAARG:

+	printf("%d",ax);

+	break;

+#if 0

+   default:

+	printf("%d %d %d",a,b,c);

+	printf(COMMENT "not handled");

+	break;

+#endif

+  }

+  printf("\n");

+ }

+}

+

+

+#define SS(x)	((x==1)?"":"s")

+#define S(x)	(int)(x),SS(x)

+

+static void PrintHeader(const Proto* f)

+{

+ const char* s=f->source ? getstr(f->source) : "=?";

+ if (*s=='@' || *s=='=')

+  s++;

+ else if (*s==LUA_SIGNATURE[0])

+  s="(bstring)";

+ else

+  s="(string)";

+ printf("\n%s <%s:%d,%d> (%d instruction%s at %p)\n",

+	(f->linedefined==0)?"main":"function",s,

+	f->linedefined,f->lastlinedefined,

+	S(f->sizecode),VOID(f));

+ printf("%d%s param%s, %d slot%s, %d upvalue%s, ",

+	(int)(f->numparams),f->is_vararg?"+":"",SS(f->numparams),

+	S(f->maxstacksize),S(f->sizeupvalues));

+ printf("%d local%s, %d constant%s, %d function%s\n",

+	S(f->sizelocvars),S(f->sizek),S(f->sizep));

+}

+

+static void PrintDebug(const Proto* f)

+{

+ int i,n;

+ n=f->sizek;

+ printf("constants (%d) for %p:\n",n,VOID(f));

+ for (i=0; i<n; i++)

+ {

+  printf("\t%d\t",i);

+  PrintType(f,i);

+  PrintConstant(f,i);

+  printf("\n");

+ }

+ n=f->sizelocvars;

+ printf("locals (%d) for %p:\n",n,VOID(f));

+ for (i=0; i<n; i++)

+ {

+  printf("\t%d\t%s\t%d\t%d\n",

+  i,getstr(f->locvars[i].varname),f->locvars[i].startpc+1,f->locvars[i].endpc+1);

+ }

+ n=f->sizeupvalues;

+ printf("upvalues (%d) for %p:\n",n,VOID(f));

+ for (i=0; i<n; i++)

+ {

+  printf("\t%d\t%s\t%d\t%d\n",

+  i,UPVALNAME(i),f->upvalues[i].instack,f->upvalues[i].idx);

+ }

+}

+

+static void PrintFunction(const Proto* f, int full)

+{

+ int i,n=f->sizep;

+ PrintHeader(f);

+ PrintCode(f);

+ if (full) PrintDebug(f);

+ for (i=0; i<n; i++) PrintFunction(f->p[i],full);

+}

--- /dev/null

+++ b/luaconf.h

@@ -1,0 +1,761 @@

+/*

+** $Id: luaconf.h $

+** Configuration file for Lua

+** See Copyright Notice in lua.h

+*/

+

+

+#ifndef luaconf_h

+#define luaconf_h

+

+#include <limits.h>

+#include <stddef.h>

+

+

+/*

+** ===================================================================

+** General Configuration File for Lua

+**

+** Some definitions here can be changed externally, through the

+** compiler (e.g., with '-D' options). Those are protected by

+** '#if !defined' guards. However, several other definitions should

+** be changed directly here, either because they affect the Lua

+** ABI (by making the changes here, you ensure that all software

+** connected to Lua, such as C libraries, will be compiled with the

+** same configuration); or because they are seldom changed.

+**

+** Search for "@@" to find all configurable definitions.

+** ===================================================================

+*/

+

+

+/*

+** {====================================================================

+** System Configuration: macros to adapt (if needed) Lua to some

+** particular platform, for instance restricting it to C89.

+** =====================================================================

+*/

+

+/*

+@@ LUA_USE_C89 controls the use of non-ISO-C89 features.

+** Define it if you want Lua to avoid the use of a few C99 features

+** or Windows-specific features on Windows.

+*/

+/* #define LUA_USE_C89 */

+

+

+/*

+** By default, Lua on Windows use (some) specific Windows features

+*/

+#if !defined(LUA_USE_C89) && defined(_WIN32) && !defined(_WIN32_WCE)

+#define LUA_USE_WINDOWS  /* enable goodies for regular Windows */

+#endif

+

+

+#if defined(LUA_USE_WINDOWS)

+#define LUA_DL_DLL	/* enable support for DLL */

+#define LUA_USE_C89	/* broadly, Windows is C89 */

+#endif

+

+

+#if defined(LUA_USE_LINUX)

+#define LUA_USE_POSIX

+#define LUA_USE_DLOPEN		/* needs an extra library: -ldl */

+#endif

+

+

+#if defined(LUA_USE_MACOSX)

+#define LUA_USE_POSIX

+#define LUA_USE_DLOPEN		/* MacOS does not need -ldl */

+#endif

+

+

+/*

+@@ LUAI_IS32INT is true iff 'int' has (at least) 32 bits.

+*/

+#define LUAI_IS32INT	((UINT_MAX >> 30) >= 3)

+

+/* }================================================================== */

+

+

+

+/*

+** {==================================================================

+** Configuration for Number types.

+** ===================================================================

+*/

+

+/*

+@@ LUA_32BITS enables Lua with 32-bit integers and 32-bit floats.

+*/

+/* #define LUA_32BITS */

+

+

+/*

+@@ LUA_C89_NUMBERS ensures that Lua uses the largest types available for

+** C89 ('long' and 'double'); Windows always has '__int64', so it does

+** not need to use this case.

+*/

+#if defined(LUA_USE_C89) && !defined(LUA_USE_WINDOWS)

+#define LUA_C89_NUMBERS

+#endif

+

+

+/*

+@@ LUA_INT_TYPE defines the type for Lua integers.

+@@ LUA_FLOAT_TYPE defines the type for Lua floats.

+** Lua should work fine with any mix of these options supported

+** by your C compiler. The usual configurations are 64-bit integers

+** and 'double' (the default), 32-bit integers and 'float' (for

+** restricted platforms), and 'long'/'double' (for C compilers not

+** compliant with C99, which may not have support for 'long long').

+*/

+

+/* predefined options for LUA_INT_TYPE */

+#define LUA_INT_INT		1

+#define LUA_INT_LONG		2

+#define LUA_INT_LONGLONG	3

+

+/* predefined options for LUA_FLOAT_TYPE */

+#define LUA_FLOAT_FLOAT		1

+#define LUA_FLOAT_DOUBLE	2

+#define LUA_FLOAT_LONGDOUBLE	3

+

+#if defined(LUA_32BITS)		/* { */

+/*

+** 32-bit integers and 'float'

+*/

+#if LUAI_IS32INT  /* use 'int' if big enough */

+#define LUA_INT_TYPE	LUA_INT_INT

+#else  /* otherwise use 'long' */

+#define LUA_INT_TYPE	LUA_INT_LONG

+#endif

+#define LUA_FLOAT_TYPE	LUA_FLOAT_FLOAT

+

+#elif defined(LUA_C89_NUMBERS)	/* }{ */

+/*

+** largest types available for C89 ('long' and 'double')

+*/

+#define LUA_INT_TYPE	LUA_INT_LONG

+#define LUA_FLOAT_TYPE	LUA_FLOAT_DOUBLE

+

+#endif				/* } */

+

+

+/*

+** default configuration for 64-bit Lua ('long long' and 'double')

+*/

+#if !defined(LUA_INT_TYPE)

+#define LUA_INT_TYPE	LUA_INT_LONGLONG

+#endif

+

+#if !defined(LUA_FLOAT_TYPE)

+#define LUA_FLOAT_TYPE	LUA_FLOAT_DOUBLE

+#endif

+

+/* }================================================================== */

+

+

+

+/*

+** {==================================================================

+** Configuration for Paths.

+** ===================================================================

+*/

+

+/*

+** LUA_PATH_SEP is the character that separates templates in a path.

+** LUA_PATH_MARK is the string that marks the substitution points in a

+** template.

+** LUA_EXEC_DIR in a Windows path is replaced by the executable's

+** directory.

+*/

+#define LUA_PATH_SEP            ";"

+#define LUA_PATH_MARK           "?"

+#define LUA_EXEC_DIR            "!"

+

+

+/*

+@@ LUA_PATH_DEFAULT is the default path that Lua uses to look for

+** Lua libraries.

+@@ LUA_CPATH_DEFAULT is the default path that Lua uses to look for

+** C libraries.

+** CHANGE them if your machine has a non-conventional directory

+** hierarchy or if you want to install your libraries in

+** non-conventional directories.

+*/

+

+#define LUA_VDIR	LUA_VERSION_MAJOR "." LUA_VERSION_MINOR

+#if defined(_WIN32)	/* { */

+/*

+** In Windows, any exclamation mark ('!') in the path is replaced by the

+** path of the directory of the executable file of the current process.

+*/

+#define LUA_LDIR	"!\\lua\\"

+#define LUA_CDIR	"!\\"

+#define LUA_SHRDIR	"!\\..\\share\\lua\\" LUA_VDIR "\\"

+

+#if !defined(LUA_PATH_DEFAULT)

+#define LUA_PATH_DEFAULT  \

+		LUA_LDIR"?.lua;"  LUA_LDIR"?\\init.lua;" \

+		LUA_CDIR"?.lua;"  LUA_CDIR"?\\init.lua;" \

+		LUA_SHRDIR"?.lua;" LUA_SHRDIR"?\\init.lua;" \

+		".\\?.lua;" ".\\?\\init.lua"

+#endif

+

+#if !defined(LUA_CPATH_DEFAULT)

+#define LUA_CPATH_DEFAULT \

+		LUA_CDIR"?.dll;" \

+		LUA_CDIR"..\\lib\\lua\\" LUA_VDIR "\\?.dll;" \

+		LUA_CDIR"loadall.dll;" ".\\?.dll"

+#endif

+

+#else			/* }{ */

+

+#define LUA_ROOT	"/usr/local/"

+#define LUA_LDIR	LUA_ROOT "share/lua/" LUA_VDIR "/"

+#define LUA_CDIR	LUA_ROOT "lib/lua/" LUA_VDIR "/"

+

+#if !defined(LUA_PATH_DEFAULT)

+#define LUA_PATH_DEFAULT  \

+		LUA_LDIR"?.lua;"  LUA_LDIR"?/init.lua;" \

+		LUA_CDIR"?.lua;"  LUA_CDIR"?/init.lua;" \

+		"./?.lua;" "./?/init.lua"

+#endif

+

+#if !defined(LUA_CPATH_DEFAULT)

+#define LUA_CPATH_DEFAULT \

+		LUA_CDIR"?.so;" LUA_CDIR"loadall.so;" "./?.so"

+#endif

+

+#endif			/* } */

+

+

+/*

+@@ LUA_DIRSEP is the directory separator (for submodules).

+** CHANGE it if your machine does not use "/" as the directory separator

+** and is not Windows. (On Windows Lua automatically uses "\".)

+*/

+#if !defined(LUA_DIRSEP)

+

+#if defined(_WIN32)

+#define LUA_DIRSEP	"\\"

+#else

+#define LUA_DIRSEP	"/"

+#endif

+

+#endif

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Marks for exported symbols in the C code

+** ===================================================================

+*/

+

+/*

+@@ LUA_API is a mark for all core API functions.

+@@ LUALIB_API is a mark for all auxiliary library functions.

+@@ LUAMOD_API is a mark for all standard library opening functions.

+** CHANGE them if you need to define those functions in some special way.

+** For instance, if you want to create one Windows DLL with the core and

+** the libraries, you may want to use the following definition (define

+** LUA_BUILD_AS_DLL to get it).

+*/

+#if defined(LUA_BUILD_AS_DLL)	/* { */

+

+#if defined(LUA_CORE) || defined(LUA_LIB)	/* { */

+#define LUA_API __declspec(dllexport)

+#else						/* }{ */

+#define LUA_API __declspec(dllimport)

+#endif						/* } */

+

+#else				/* }{ */

+

+#define LUA_API		extern

+

+#endif				/* } */

+

+

+/*

+** More often than not the libs go together with the core.

+*/

+#define LUALIB_API	LUA_API

+#define LUAMOD_API	LUA_API

+

+

+/*

+@@ LUAI_FUNC is a mark for all extern functions that are not to be

+** exported to outside modules.

+@@ LUAI_DDEF and LUAI_DDEC are marks for all extern (const) variables,

+** none of which to be exported to outside modules (LUAI_DDEF for

+** definitions and LUAI_DDEC for declarations).

+** CHANGE them if you need to mark them in some special way. Elf/gcc

+** (versions 3.2 and later) mark them as "hidden" to optimize access

+** when Lua is compiled as a shared library. Not all elf targets support

+** this attribute. Unfortunately, gcc does not offer a way to check

+** whether the target offers that support, and those without support

+** give a warning about it. To avoid these warnings, change to the

+** default definition.

+*/

+#if defined(__GNUC__) && ((__GNUC__*100 + __GNUC_MINOR__) >= 302) && \

+    defined(__ELF__)		/* { */

+#define LUAI_FUNC	__attribute__((visibility("internal"))) extern

+#else				/* }{ */

+#define LUAI_FUNC	extern

+#endif				/* } */

+

+#define LUAI_DDEC(dec)	LUAI_FUNC dec

+#define LUAI_DDEF	/* empty */

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Compatibility with previous versions

+** ===================================================================

+*/

+

+/*

+@@ LUA_COMPAT_5_3 controls other macros for compatibility with Lua 5.3.

+** You can define it to get all options, or change specific options

+** to fit your specific needs.

+*/

+#if defined(LUA_COMPAT_5_3)	/* { */

+

+/*

+@@ LUA_COMPAT_MATHLIB controls the presence of several deprecated

+** functions in the mathematical library.

+** (These functions were already officially removed in 5.3;

+** nevertheless they are still available here.)

+*/

+#define LUA_COMPAT_MATHLIB

+

+/*

+@@ LUA_COMPAT_APIINTCASTS controls the presence of macros for

+** manipulating other integer types (lua_pushunsigned, lua_tounsigned,

+** luaL_checkint, luaL_checklong, etc.)

+** (These macros were also officially removed in 5.3, but they are still

+** available here.)

+*/

+#define LUA_COMPAT_APIINTCASTS

+

+

+/*

+@@ LUA_COMPAT_LT_LE controls the emulation of the '__le' metamethod

+** using '__lt'.

+*/

+#define LUA_COMPAT_LT_LE

+

+

+/*

+@@ The following macros supply trivial compatibility for some

+** changes in the API. The macros themselves document how to

+** change your code to avoid using them.

+** (Once more, these macros were officially removed in 5.3, but they are

+** still available here.)

+*/

+#define lua_strlen(L,i)		lua_rawlen(L, (i))

+

+#define lua_objlen(L,i)		lua_rawlen(L, (i))

+

+#define lua_equal(L,idx1,idx2)		lua_compare(L,(idx1),(idx2),LUA_OPEQ)

+#define lua_lessthan(L,idx1,idx2)	lua_compare(L,(idx1),(idx2),LUA_OPLT)

+

+#endif				/* } */

+

+/* }================================================================== */

+

+

+

+/*

+** {==================================================================

+** Configuration for Numbers.

+** Change these definitions if no predefined LUA_FLOAT_* / LUA_INT_*

+** satisfy your needs.

+** ===================================================================

+*/

+

+/*

+@@ LUA_NUMBER is the floating-point type used by Lua.

+@@ LUAI_UACNUMBER is the result of a 'default argument promotion'

+@@ over a floating number.

+@@ l_floatatt(x) corrects float attribute 'x' to the proper float type

+** by prefixing it with one of FLT/DBL/LDBL.

+@@ LUA_NUMBER_FRMLEN is the length modifier for writing floats.

+@@ LUA_NUMBER_FMT is the format for writing floats.

+@@ lua_number2str converts a float to a string.

+@@ l_mathop allows the addition of an 'l' or 'f' to all math operations.

+@@ l_floor takes the floor of a float.

+@@ lua_str2number converts a decimal numeral to a number.

+*/

+

+

+/* The following definitions are good for most cases here */

+

+#define l_floor(x)		(l_mathop(floor)(x))

+

+#define lua_number2str(s,sz,n)  \

+	l_sprintf((s), sz, LUA_NUMBER_FMT, (LUAI_UACNUMBER)(n))

+

+/*

+@@ lua_numbertointeger converts a float number with an integral value

+** to an integer, or returns 0 if float is not within the range of

+** a lua_Integer.  (The range comparisons are tricky because of

+** rounding. The tests here assume a two-complement representation,

+** where MININTEGER always has an exact representation as a float;

+** MAXINTEGER may not have one, and therefore its conversion to float

+** may have an ill-defined value.)

+*/

+#define lua_numbertointeger(n,p) \

+  ((n) >= (LUA_NUMBER)(LUA_MININTEGER) && \

+   (n) < -(LUA_NUMBER)(LUA_MININTEGER) && \

+      (*(p) = (LUA_INTEGER)(n), 1))

+

+

+/* now the variable definitions */

+

+#if LUA_FLOAT_TYPE == LUA_FLOAT_FLOAT		/* { single float */

+

+#define LUA_NUMBER	float

+

+#define l_floatatt(n)		(FLT_##n)

+

+#define LUAI_UACNUMBER	double

+

+#define LUA_NUMBER_FRMLEN	""

+#define LUA_NUMBER_FMT		"%.7g"

+

+#define l_mathop(op)		op##f

+

+#define lua_str2number(s,p)	strtof((s), (p))

+

+

+#elif LUA_FLOAT_TYPE == LUA_FLOAT_LONGDOUBLE	/* }{ long double */

+

+#define LUA_NUMBER	long double

+

+#define l_floatatt(n)		(LDBL_##n)

+

+#define LUAI_UACNUMBER	long double

+

+#define LUA_NUMBER_FRMLEN	"L"

+#define LUA_NUMBER_FMT		"%.19Lg"

+

+#define l_mathop(op)		op##l

+

+#define lua_str2number(s,p)	strtold((s), (p))

+

+#elif LUA_FLOAT_TYPE == LUA_FLOAT_DOUBLE	/* }{ double */

+

+#define LUA_NUMBER	double

+

+#define l_floatatt(n)		(DBL_##n)

+

+#define LUAI_UACNUMBER	double

+

+#define LUA_NUMBER_FRMLEN	""

+#define LUA_NUMBER_FMT		"%.14g"

+

+#define l_mathop(op)		op

+

+#define lua_str2number(s,p)	strtod((s), (p))

+

+#else						/* }{ */

+

+#error "numeric float type not defined"

+

+#endif					/* } */

+

+

+

+/*

+@@ LUA_INTEGER is the integer type used by Lua.

+**

+@@ LUA_UNSIGNED is the unsigned version of LUA_INTEGER.

+**

+@@ LUAI_UACINT is the result of a 'default argument promotion'

+@@ over a LUA_INTEGER.

+@@ LUA_INTEGER_FRMLEN is the length modifier for reading/writing integers.

+@@ LUA_INTEGER_FMT is the format for writing integers.

+@@ LUA_MAXINTEGER is the maximum value for a LUA_INTEGER.

+@@ LUA_MININTEGER is the minimum value for a LUA_INTEGER.

+@@ LUA_MAXUNSIGNED is the maximum value for a LUA_UNSIGNED.

+@@ LUA_UNSIGNEDBITS is the number of bits in a LUA_UNSIGNED.

+@@ lua_integer2str converts an integer to a string.

+*/

+

+

+/* The following definitions are good for most cases here */

+

+#define LUA_INTEGER_FMT		"%" LUA_INTEGER_FRMLEN "d"

+

+#define LUAI_UACINT		LUA_INTEGER

+

+#define lua_integer2str(s,sz,n)  \

+	l_sprintf((s), sz, LUA_INTEGER_FMT, (LUAI_UACINT)(n))

+

+/*

+** use LUAI_UACINT here to avoid problems with promotions (which

+** can turn a comparison between unsigneds into a signed comparison)

+*/

+#define LUA_UNSIGNED		unsigned LUAI_UACINT

+

+

+#define LUA_UNSIGNEDBITS	(sizeof(LUA_UNSIGNED) * CHAR_BIT)

+

+

+/* now the variable definitions */

+

+#if LUA_INT_TYPE == LUA_INT_INT		/* { int */

+

+#define LUA_INTEGER		int

+#define LUA_INTEGER_FRMLEN	""

+

+#define LUA_MAXINTEGER		INT_MAX

+#define LUA_MININTEGER		INT_MIN

+

+#define LUA_MAXUNSIGNED		UINT_MAX

+

+#elif LUA_INT_TYPE == LUA_INT_LONG	/* }{ long */

+

+#define LUA_INTEGER		long

+#define LUA_INTEGER_FRMLEN	"l"

+

+#define LUA_MAXINTEGER		LONG_MAX

+#define LUA_MININTEGER		LONG_MIN

+

+#define LUA_MAXUNSIGNED		ULONG_MAX

+

+#elif LUA_INT_TYPE == LUA_INT_LONGLONG	/* }{ long long */

+

+/* use presence of macro LLONG_MAX as proxy for C99 compliance */

+#if defined(LLONG_MAX)		/* { */

+/* use ISO C99 stuff */

+

+#define LUA_INTEGER		long long

+#define LUA_INTEGER_FRMLEN	"ll"

+

+#define LUA_MAXINTEGER		LLONG_MAX

+#define LUA_MININTEGER		LLONG_MIN

+

+#define LUA_MAXUNSIGNED		ULLONG_MAX

+

+#elif defined(LUA_USE_WINDOWS) /* }{ */

+/* in Windows, can use specific Windows types */

+

+#define LUA_INTEGER		__int64

+#define LUA_INTEGER_FRMLEN	"I64"

+

+#define LUA_MAXINTEGER		_I64_MAX

+#define LUA_MININTEGER		_I64_MIN

+

+#define LUA_MAXUNSIGNED		_UI64_MAX

+

+#else				/* }{ */

+

+#error "Compiler does not support 'long long'. Use option '-DLUA_32BITS' \

+  or '-DLUA_C89_NUMBERS' (see file 'luaconf.h' for details)"

+

+#endif				/* } */

+

+#else				/* }{ */

+

+#error "numeric integer type not defined"

+

+#endif				/* } */

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Dependencies with C99 and other C details

+** ===================================================================

+*/

+

+/*

+@@ l_sprintf is equivalent to 'snprintf' or 'sprintf' in C89.

+** (All uses in Lua have only one format item.)

+*/

+#if !defined(LUA_USE_C89)

+#define l_sprintf(s,sz,f,i)	snprintf(s,sz,f,i)

+#else

+#define l_sprintf(s,sz,f,i)	((void)(sz), sprintf(s,f,i))

+#endif

+

+

+/*

+@@ lua_strx2number converts a hexadecimal numeral to a number.

+** In C99, 'strtod' does that conversion. Otherwise, you can

+** leave 'lua_strx2number' undefined and Lua will provide its own

+** implementation.

+*/

+#if !defined(LUA_USE_C89)

+#define lua_strx2number(s,p)		lua_str2number(s,p)

+#endif

+

+

+/*

+@@ lua_pointer2str converts a pointer to a readable string in a

+** non-specified way.

+*/

+#define lua_pointer2str(buff,sz,p)	l_sprintf(buff,sz,"%p",p)

+

+

+/*

+@@ lua_number2strx converts a float to a hexadecimal numeral.

+** In C99, 'sprintf' (with format specifiers '%a'/'%A') does that.

+** Otherwise, you can leave 'lua_number2strx' undefined and Lua will

+** provide its own implementation.

+*/

+#if !defined(LUA_USE_C89)

+#define lua_number2strx(L,b,sz,f,n)  \

+	((void)L, l_sprintf(b,sz,f,(LUAI_UACNUMBER)(n)))

+#endif

+

+

+/*

+** 'strtof' and 'opf' variants for math functions are not valid in

+** C89. Otherwise, the macro 'HUGE_VALF' is a good proxy for testing the

+** availability of these variants. ('math.h' is already included in

+** all files that use these macros.)

+*/

+#if defined(LUA_USE_C89) || (defined(HUGE_VAL) && !defined(HUGE_VALF))

+#undef l_mathop  /* variants not available */

+#undef lua_str2number

+#define l_mathop(op)		(lua_Number)op  /* no variant */

+#define lua_str2number(s,p)	((lua_Number)strtod((s), (p)))

+#endif

+

+

+/*

+@@ LUA_KCONTEXT is the type of the context ('ctx') for continuation

+** functions.  It must be a numerical type; Lua will use 'intptr_t' if

+** available, otherwise it will use 'ptrdiff_t' (the nearest thing to

+** 'intptr_t' in C89)

+*/

+#define LUA_KCONTEXT	ptrdiff_t

+

+#if !defined(LUA_USE_C89) && defined(__STDC_VERSION__) && \

+    __STDC_VERSION__ >= 199901L

+#include <stdint.h>

+#if defined(INTPTR_MAX)  /* even in C99 this type is optional */

+#undef LUA_KCONTEXT

+#define LUA_KCONTEXT	intptr_t

+#endif

+#endif

+

+

+/*

+@@ lua_getlocaledecpoint gets the locale "radix character" (decimal point).

+** Change that if you do not want to use C locales. (Code using this

+** macro must include the header 'locale.h'.)

+*/

+#if !defined(lua_getlocaledecpoint)

+#define lua_getlocaledecpoint()		(localeconv()->decimal_point[0])

+#endif

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Language Variations

+** =====================================================================

+*/

+

+/*

+@@ LUA_NOCVTN2S/LUA_NOCVTS2N control how Lua performs some

+** coercions. Define LUA_NOCVTN2S to turn off automatic coercion from

+** numbers to strings. Define LUA_NOCVTS2N to turn off automatic

+** coercion from strings to numbers.

+*/

+/* #define LUA_NOCVTN2S */

+/* #define LUA_NOCVTS2N */

+

+

+/*

+@@ LUA_USE_APICHECK turns on several consistency checks on the C API.

+** Define it as a help when debugging C code.

+*/

+#if defined(LUA_USE_APICHECK)

+#include <assert.h>

+#define luai_apicheck(l,e)	assert(e)

+#endif

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Macros that affect the API and must be stable (that is, must be the

+** same when you compile Lua and when you compile code that links to

+** Lua).

+** =====================================================================

+*/

+

+/*

+@@ LUAI_MAXSTACK limits the size of the Lua stack.

+** CHANGE it if you need a different limit. This limit is arbitrary;

+** its only purpose is to stop Lua from consuming unlimited stack

+** space (and to reserve some numbers for pseudo-indices).

+** (It must fit into max(size_t)/32.)

+*/

+#if LUAI_IS32INT

+#define LUAI_MAXSTACK		1000000

+#else

+#define LUAI_MAXSTACK		15000

+#endif

+

+

+/*

+@@ LUA_EXTRASPACE defines the size of a raw memory area associated with

+** a Lua state with very fast access.

+** CHANGE it if you need a different size.

+*/

+#define LUA_EXTRASPACE		(sizeof(void *))

+

+

+/*

+@@ LUA_IDSIZE gives the maximum size for the description of the source

+@@ of a function in debug information.

+** CHANGE it if you want a different size.

+*/

+#define LUA_IDSIZE	60

+

+

+/*

+@@ LUAL_BUFFERSIZE is the buffer size used by the lauxlib buffer system.

+*/

+#define LUAL_BUFFERSIZE   ((int)(16 * sizeof(void*) * sizeof(lua_Number)))

+

+

+/*

+@@ LUAI_MAXALIGN defines fields that, when used in a union, ensure

+** maximum alignment for the other items in that union.

+*/

+#define LUAI_MAXALIGN  lua_Number n; double u; void *s; lua_Integer i; long l

+

+/* }================================================================== */

+

+

+

+

+

+/* =================================================================== */

+

+/*

+** Local configuration. You can use this space to add your redefinitions

+** without modifying the main part of the file.

+*/

+

+

+

+

+

+#endif

+

--- /dev/null

+++ b/lualib.h

@@ -1,0 +1,58 @@

+/*

+** $Id: lualib.h $

+** Lua standard libraries

+** See Copyright Notice in lua.h

+*/

+

+

+#ifndef lualib_h

+#define lualib_h

+

+#include "lua.h"

+

+

+/* version suffix for environment variable names */

+#define LUA_VERSUFFIX          "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR

+

+

+LUAMOD_API int (luaopen_base) (lua_State *L);

+

+#define LUA_COLIBNAME	"coroutine"

+LUAMOD_API int (luaopen_coroutine) (lua_State *L);

+

+#define LUA_TABLIBNAME	"table"

+LUAMOD_API int (luaopen_table) (lua_State *L);

+

+#define LUA_IOLIBNAME	"io"

+LUAMOD_API int (luaopen_io) (lua_State *L);

+

+#define LUA_OSLIBNAME	"os"

+LUAMOD_API int (luaopen_os) (lua_State *L);

+

+#define LUA_STRLIBNAME	"string"

+LUAMOD_API int (luaopen_string) (lua_State *L);

+

+#define LUA_UTF8LIBNAME	"utf8"

+LUAMOD_API int (luaopen_utf8) (lua_State *L);

+

+#define LUA_MATHLIBNAME	"math"

+LUAMOD_API int (luaopen_math) (lua_State *L);

+

+#define LUA_DBLIBNAME	"debug"

+LUAMOD_API int (luaopen_debug) (lua_State *L);

+

+#define LUA_LOADLIBNAME	"package"

+LUAMOD_API int (luaopen_package) (lua_State *L);

+

+

+/* open all previous libraries */

+LUALIB_API void (luaL_openlibs) (lua_State *L);

+

+

+

+#if !defined(lua_assert)

+#define lua_assert(x)	((void)0)

+#endif

+

+

+#endif

--- /dev/null

+++ b/lundump.c

@@ -1,0 +1,333 @@

+/*

+** $Id: lundump.c $

+** load precompiled Lua chunks

+** See Copyright Notice in lua.h

+*/

+

+#define lundump_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <limits.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "ldebug.h"

+#include "ldo.h"

+#include "lfunc.h"

+#include "lmem.h"

+#include "lobject.h"

+#include "lstring.h"

+#include "lundump.h"

+#include "lzio.h"

+

+

+#if !defined(luai_verifycode)

+#define luai_verifycode(L,f)  /* empty */

+#endif

+

+

+typedef struct {

+  lua_State *L;

+  ZIO *Z;

+  const char *name;

+} LoadState;

+

+

+static l_noret error (LoadState *S, const char *why) {

+  luaO_pushfstring(S->L, "%s: bad binary format (%s)", S->name, why);

+  luaD_throw(S->L, LUA_ERRSYNTAX);

+}

+

+

+/*

+** All high-level loads go through loadVector; you can change it to

+** adapt to the endianness of the input

+*/

+#define loadVector(S,b,n)	loadBlock(S,b,(n)*sizeof((b)[0]))

+

+static void loadBlock (LoadState *S, void *b, size_t size) {

+  if (luaZ_read(S->Z, b, size) != 0)

+    error(S, "truncated chunk");

+}

+

+

+#define loadVar(S,x)		loadVector(S,&x,1)

+

+

+static lu_byte loadByte (LoadState *S) {

+  int b = zgetc(S->Z);

+  if (b == EOZ)

+    error(S, "truncated chunk");

+  return cast_byte(b);

+}

+

+

+static size_t loadUnsigned (LoadState *S, size_t limit) {

+  size_t x = 0;

+  int b;

+  limit >>= 7;

+  do {

+    b = loadByte(S);

+    if (x >= limit)

+      error(S, "integer overflow");

+    x = (x << 7) | (b & 0x7f);

+  } while ((b & 0x80) == 0);

+  return x;

+}

+

+

+static size_t loadSize (LoadState *S) {

+  return loadUnsigned(S, ~(size_t)0);

+}

+

+

+static int loadInt (LoadState *S) {

+  return cast_int(loadUnsigned(S, INT_MAX));

+}

+

+

+static lua_Number loadNumber (LoadState *S) {

+  lua_Number x;

+  loadVar(S, x);

+  return x;

+}

+

+

+static lua_Integer loadInteger (LoadState *S) {

+  lua_Integer x;

+  loadVar(S, x);

+  return x;

+}

+

+

+/*

+** Load a nullable string into prototype 'p'.

+*/

+static TString *loadStringN (LoadState *S, Proto *p) {

+  lua_State *L = S->L;

+  TString *ts;

+  size_t size = loadSize(S);

+  if (size == 0)  /* no string? */

+    return NULL;

+  else if (--size <= LUAI_MAXSHORTLEN) {  /* short string? */

+    char buff[LUAI_MAXSHORTLEN];

+    loadVector(S, buff, size);  /* load string into buffer */

+    ts = luaS_newlstr(L, buff, size);  /* create string */

+  }

+  else {  /* long string */

+    ts = luaS_createlngstrobj(L, size);  /* create string */

+    setsvalue2s(L, L->top, ts);  /* anchor it ('loadVector' can GC) */

+    luaD_inctop(L);

+    loadVector(S, getstr(ts), size);  /* load directly in final place */

+    L->top--;  /* pop string */

+  }

+  luaC_objbarrier(L, p, ts);

+  return ts;

+}

+

+

+/*

+** Load a non-nullable string into prototype 'p'.

+*/

+static TString *loadString (LoadState *S, Proto *p) {

+  TString *st = loadStringN(S, p);

+  if (st == NULL)

+    error(S, "bad format for constant string");

+  return st;

+}

+

+

+static void loadCode (LoadState *S, Proto *f) {

+  int n = loadInt(S);

+  f->code = luaM_newvectorchecked(S->L, n, Instruction);

+  f->sizecode = n;

+  loadVector(S, f->code, n);

+}

+

+

+static void loadFunction(LoadState *S, Proto *f, TString *psource);

+

+

+static void loadConstants (LoadState *S, Proto *f) {

+  int i;

+  int n = loadInt(S);

+  f->k = luaM_newvectorchecked(S->L, n, TValue);

+  f->sizek = n;

+  for (i = 0; i < n; i++)

+    setnilvalue(&f->k[i]);

+  for (i = 0; i < n; i++) {

+    TValue *o = &f->k[i];

+    int t = loadByte(S);

+    switch (t) {

+      case LUA_VNIL:

+        setnilvalue(o);

+        break;

+      case LUA_VFALSE:

+        setbfvalue(o);

+        break;

+      case LUA_VTRUE:

+        setbtvalue(o);

+        break;

+      case LUA_VNUMFLT:

+        setfltvalue(o, loadNumber(S));

+        break;

+      case LUA_VNUMINT:

+        setivalue(o, loadInteger(S));

+        break;

+      case LUA_VSHRSTR:

+      case LUA_VLNGSTR:

+        setsvalue2n(S->L, o, loadString(S, f));

+        break;

+      default: lua_assert(0);

+    }

+  }

+}

+

+

+static void loadProtos (LoadState *S, Proto *f) {

+  int i;

+  int n = loadInt(S);

+  f->p = luaM_newvectorchecked(S->L, n, Proto *);

+  f->sizep = n;

+  for (i = 0; i < n; i++)

+    f->p[i] = NULL;

+  for (i = 0; i < n; i++) {

+    f->p[i] = luaF_newproto(S->L);

+    luaC_objbarrier(S->L, f, f->p[i]);

+    loadFunction(S, f->p[i], f->source);

+  }

+}

+

+

+/*

+** Load the upvalues for a function. The names must be filled first,

+** because the filling of the other fields can raise read errors and

+** the creation of the error message can call an emergency collection;

+** in that case all prototypes must be consistent for the GC.

+*/

+static void loadUpvalues (LoadState *S, Proto *f) {

+  int i, n;

+  n = loadInt(S);

+  f->upvalues = luaM_newvectorchecked(S->L, n, Upvaldesc);

+  f->sizeupvalues = n;

+  for (i = 0; i < n; i++)  /* make array valid for GC */

+    f->upvalues[i].name = NULL;

+  for (i = 0; i < n; i++) {  /* following calls can raise errors */

+    f->upvalues[i].instack = loadByte(S);

+    f->upvalues[i].idx = loadByte(S);

+    f->upvalues[i].kind = loadByte(S);

+  }

+}

+

+

+static void loadDebug (LoadState *S, Proto *f) {

+  int i, n;

+  n = loadInt(S);

+  f->lineinfo = luaM_newvectorchecked(S->L, n, ls_byte);

+  f->sizelineinfo = n;

+  loadVector(S, f->lineinfo, n);

+  n = loadInt(S);

+  f->abslineinfo = luaM_newvectorchecked(S->L, n, AbsLineInfo);

+  f->sizeabslineinfo = n;

+  for (i = 0; i < n; i++) {

+    f->abslineinfo[i].pc = loadInt(S);

+    f->abslineinfo[i].line = loadInt(S);

+  }

+  n = loadInt(S);

+  f->locvars = luaM_newvectorchecked(S->L, n, LocVar);

+  f->sizelocvars = n;

+  for (i = 0; i < n; i++)

+    f->locvars[i].varname = NULL;

+  for (i = 0; i < n; i++) {

+    f->locvars[i].varname = loadStringN(S, f);

+    f->locvars[i].startpc = loadInt(S);

+    f->locvars[i].endpc = loadInt(S);

+  }

+  n = loadInt(S);

+  for (i = 0; i < n; i++)

+    f->upvalues[i].name = loadStringN(S, f);

+}

+

+

+static void loadFunction (LoadState *S, Proto *f, TString *psource) {

+  f->source = loadStringN(S, f);

+  if (f->source == NULL)  /* no source in dump? */

+    f->source = psource;  /* reuse parent's source */

+  f->linedefined = loadInt(S);

+  f->lastlinedefined = loadInt(S);

+  f->numparams = loadByte(S);

+  f->is_vararg = loadByte(S);

+  f->maxstacksize = loadByte(S);

+  loadCode(S, f);

+  loadConstants(S, f);

+  loadUpvalues(S, f);

+  loadProtos(S, f);

+  loadDebug(S, f);

+}

+

+

+static void checkliteral (LoadState *S, const char *s, const char *msg) {

+  char buff[sizeof(LUA_SIGNATURE) + sizeof(LUAC_DATA)]; /* larger than both */

+  size_t len = strlen(s);

+  loadVector(S, buff, len);

+  if (memcmp(s, buff, len) != 0)

+    error(S, msg);

+}

+

+

+static void fchecksize (LoadState *S, size_t size, const char *tname) {

+  if (loadByte(S) != size)

+    error(S, luaO_pushfstring(S->L, "%s size mismatch", tname));

+}

+

+

+#define checksize(S,t)	fchecksize(S,sizeof(t),#t)

+

+static void checkHeader (LoadState *S) {

+  /* skip 1st char (already read and checked) */

+  checkliteral(S, &LUA_SIGNATURE[1], "not a binary chunk");

+  if (loadByte(S) != LUAC_VERSION)

+    error(S, "version mismatch");

+  if (loadByte(S) != LUAC_FORMAT)

+    error(S, "format mismatch");

+  checkliteral(S, LUAC_DATA, "corrupted chunk");

+  checksize(S, Instruction);

+  checksize(S, lua_Integer);

+  checksize(S, lua_Number);

+  if (loadInteger(S) != LUAC_INT)

+    error(S, "integer format mismatch");

+  if (loadNumber(S) != LUAC_NUM)

+    error(S, "float format mismatch");

+}

+

+

+/*

+** Load precompiled chunk.

+*/

+LClosure *luaU_undump(lua_State *L, ZIO *Z, const char *name) {

+  LoadState S;

+  LClosure *cl;

+  if (*name == '@' || *name == '=')

+    S.name = name + 1;

+  else if (*name == LUA_SIGNATURE[0])

+    S.name = "binary string";

+  else

+    S.name = name;

+  S.L = L;

+  S.Z = Z;

+  checkHeader(&S);

+  cl = luaF_newLclosure(L, loadByte(&S));

+  setclLvalue2s(L, L->top, cl);

+  luaD_inctop(L);

+  cl->p = luaF_newproto(L);

+  luaC_objbarrier(L, cl, cl->p);

+  loadFunction(&S, cl->p, NULL);

+  lua_assert(cl->nupvalues == cl->p->sizeupvalues);

+  luai_verifycode(L, cl->p);

+  return cl;

+}

+

--- /dev/null

+++ b/lundump.h

@@ -1,0 +1,36 @@

+/*

+** $Id: lundump.h $

+** load precompiled Lua chunks

+** See Copyright Notice in lua.h

+*/

+

+#ifndef lundump_h

+#define lundump_h

+

+#include "llimits.h"

+#include "lobject.h"

+#include "lzio.h"

+

+

+/* data to catch conversion errors */

+#define LUAC_DATA	"\x19\x93\r\n\x1a\n"

+

+#define LUAC_INT	0x5678

+#define LUAC_NUM	cast_num(370.5)

+

+/*

+** Encode major-minor version in one byte, one nibble for each

+*/

+#define MYINT(s)	(s[0]-'0')  /* assume one-digit numerals */

+#define LUAC_VERSION	(MYINT(LUA_VERSION_MAJOR)*16+MYINT(LUA_VERSION_MINOR))

+

+#define LUAC_FORMAT	0	/* this is the official format */

+

+/* load one chunk; from lundump.c */

+LUAI_FUNC LClosure* luaU_undump (lua_State* L, ZIO* Z, const char* name);

+

+/* dump one chunk; from ldump.c */

+LUAI_FUNC int luaU_dump (lua_State* L, const Proto* f, lua_Writer w,

+                         void* data, int strip);

+

+#endif

--- /dev/null

+++ b/lutf8lib.c

@@ -1,0 +1,289 @@

+/*

+** $Id: lutf8lib.c $

+** Standard library for UTF-8 manipulation

+** See Copyright Notice in lua.h

+*/

+

+#define lutf8lib_c

+#define LUA_LIB

+

+#include "lprefix.h"

+

+

+#include <assert.h>

+#include <limits.h>

+#include <stdlib.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "lauxlib.h"

+#include "lualib.h"

+

+

+#define MAXUNICODE	0x10FFFFu

+

+#define MAXUTF		0x7FFFFFFFu

+

+/*

+** Integer type for decoded UTF-8 values; MAXUTF needs 31 bits.

+*/

+#if (UINT_MAX >> 30) >= 1

+typedef unsigned int utfint;

+#else

+typedef unsigned long utfint;

+#endif

+

+

+#define iscont(p)	((*(p) & 0xC0) == 0x80)

+

+

+/* from strlib */

+/* translate a relative string position: negative means back from end */

+static lua_Integer u_posrelat (lua_Integer pos, size_t len) {

+  if (pos >= 0) return pos;

+  else if (0u - (size_t)pos > len) return 0;

+  else return (lua_Integer)len + pos + 1;

+}

+

+

+/*

+** Decode one UTF-8 sequence, returning NULL if byte sequence is

+** invalid.  The array 'limits' stores the minimum value for each

+** sequence length, to check for overlong representations. Its first

+** entry forces an error for non-ascii bytes with no continuation

+** bytes (count == 0).

+*/

+static const char *utf8_decode (const char *s, utfint *val, int strict) {

+  static const utfint limits[] =

+        {~(utfint)0, 0x80, 0x800, 0x10000u, 0x200000u, 0x4000000u};

+  unsigned int c = (unsigned char)s[0];

+  utfint res = 0;  /* final result */

+  if (c < 0x80)  /* ascii? */

+    res = c;

+  else {

+    int count = 0;  /* to count number of continuation bytes */

+    for (; c & 0x40; c <<= 1) {  /* while it needs continuation bytes... */

+      unsigned int cc = (unsigned char)s[++count];  /* read next byte */

+      if ((cc & 0xC0) != 0x80)  /* not a continuation byte? */

+        return NULL;  /* invalid byte sequence */

+      res = (res << 6) | (cc & 0x3F);  /* add lower 6 bits from cont. byte */

+    }

+    res |= ((utfint)(c & 0x7F) << (count * 5));  /* add first byte */

+    if (count > 5 || res > MAXUTF || res < limits[count])

+      return NULL;  /* invalid byte sequence */

+    s += count;  /* skip continuation bytes read */

+  }

+  if (strict) {

+    /* check for invalid code points; too large or surrogates */

+    if (res > MAXUNICODE || (0xD800u <= res && res <= 0xDFFFu))

+      return NULL;

+  }

+  if (val) *val = res;

+  return s + 1;  /* +1 to include first byte */

+}

+

+

+/*

+** utf8len(s [, i [, j [, lax]]]) --> number of characters that

+** start in the range [i,j], or nil + current position if 's' is not

+** well formed in that interval

+*/

+static int utflen (lua_State *L) {

+  lua_Integer n = 0;  /* counter for the number of characters */

+  size_t len;  /* string length in bytes */

+  const char *s = luaL_checklstring(L, 1, &len);

+  lua_Integer posi = u_posrelat(luaL_optinteger(L, 2, 1), len);

+  lua_Integer posj = u_posrelat(luaL_optinteger(L, 3, -1), len);

+  int lax = lua_toboolean(L, 4);

+  luaL_argcheck(L, 1 <= posi && --posi <= (lua_Integer)len, 2,

+                   "initial position out of bounds");

+  luaL_argcheck(L, --posj < (lua_Integer)len, 3,

+                   "final position out of bounds");

+  while (posi <= posj) {

+    const char *s1 = utf8_decode(s + posi, NULL, !lax);

+    if (s1 == NULL) {  /* conversion error? */

+      luaL_pushfail(L);  /* return fail ... */

+      lua_pushinteger(L, posi + 1);  /* ... and current position */

+      return 2;

+    }

+    posi = s1 - s;

+    n++;

+  }

+  lua_pushinteger(L, n);

+  return 1;

+}

+

+

+/*

+** codepoint(s, [i, [j [, lax]]]) -> returns codepoints for all

+** characters that start in the range [i,j]

+*/

+static int codepoint (lua_State *L) {

+  size_t len;

+  const char *s = luaL_checklstring(L, 1, &len);

+  lua_Integer posi = u_posrelat(luaL_optinteger(L, 2, 1), len);

+  lua_Integer pose = u_posrelat(luaL_optinteger(L, 3, posi), len);

+  int lax = lua_toboolean(L, 4);

+  int n;

+  const char *se;

+  luaL_argcheck(L, posi >= 1, 2, "out of bounds");

+  luaL_argcheck(L, pose <= (lua_Integer)len, 3, "out of bounds");

+  if (posi > pose) return 0;  /* empty interval; return no values */

+  if (pose - posi >= INT_MAX)  /* (lua_Integer -> int) overflow? */

+    return luaL_error(L, "string slice too long");

+  n = (int)(pose -  posi) + 1;  /* upper bound for number of returns */

+  luaL_checkstack(L, n, "string slice too long");

+  n = 0;  /* count the number of returns */

+  se = s + pose;  /* string end */

+  for (s += posi - 1; s < se;) {

+    utfint code;

+    s = utf8_decode(s, &code, !lax);

+    if (s == NULL)

+      return luaL_error(L, "invalid UTF-8 code");

+    lua_pushinteger(L, code);

+    n++;

+  }

+  return n;

+}

+

+

+static void pushutfchar (lua_State *L, int arg) {

+  lua_Unsigned code = (lua_Unsigned)luaL_checkinteger(L, arg);

+  luaL_argcheck(L, code <= MAXUTF, arg, "value out of range");

+  lua_pushfstring(L, "%U", (long)code);

+}

+

+

+/*

+** utfchar(n1, n2, ...)  -> char(n1)..char(n2)...

+*/

+static int utfchar (lua_State *L) {

+  int n = lua_gettop(L);  /* number of arguments */

+  if (n == 1)  /* optimize common case of single char */

+    pushutfchar(L, 1);

+  else {

+    int i;

+    luaL_Buffer b;

+    luaL_buffinit(L, &b);

+    for (i = 1; i <= n; i++) {

+      pushutfchar(L, i);

+      luaL_addvalue(&b);

+    }

+    luaL_pushresult(&b);

+  }

+  return 1;

+}

+

+

+/*

+** offset(s, n, [i])  -> index where n-th character counting from

+**   position 'i' starts; 0 means character at 'i'.

+*/

+static int byteoffset (lua_State *L) {

+  size_t len;

+  const char *s = luaL_checklstring(L, 1, &len);

+  lua_Integer n  = luaL_checkinteger(L, 2);

+  lua_Integer posi = (n >= 0) ? 1 : len + 1;

+  posi = u_posrelat(luaL_optinteger(L, 3, posi), len);

+  luaL_argcheck(L, 1 <= posi && --posi <= (lua_Integer)len, 3,

+                   "position out of bounds");

+  if (n == 0) {

+    /* find beginning of current byte sequence */

+    while (posi > 0 && iscont(s + posi)) posi--;

+  }

+  else {

+    if (iscont(s + posi))

+      return luaL_error(L, "initial position is a continuation byte");

+    if (n < 0) {

+       while (n < 0 && posi > 0) {  /* move back */

+         do {  /* find beginning of previous character */

+           posi--;

+         } while (posi > 0 && iscont(s + posi));

+         n++;

+       }

+     }

+     else {

+       n--;  /* do not move for 1st character */

+       while (n > 0 && posi < (lua_Integer)len) {

+         do {  /* find beginning of next character */

+           posi++;

+         } while (iscont(s + posi));  /* (cannot pass final '\0') */

+         n--;

+       }

+     }

+  }

+  if (n == 0)  /* did it find given character? */

+    lua_pushinteger(L, posi + 1);

+  else  /* no such character */

+    luaL_pushfail(L);

+  return 1;

+}

+

+

+static int iter_aux (lua_State *L, int strict) {

+  size_t len;

+  const char *s = luaL_checklstring(L, 1, &len);

+  lua_Integer n = lua_tointeger(L, 2) - 1;

+  if (n < 0)  /* first iteration? */

+    n = 0;  /* start from here */

+  else if (n < (lua_Integer)len) {

+    n++;  /* skip current byte */

+    while (iscont(s + n)) n++;  /* and its continuations */

+  }

+  if (n >= (lua_Integer)len)

+    return 0;  /* no more codepoints */

+  else {

+    utfint code;

+    const char *next = utf8_decode(s + n, &code, strict);

+    if (next == NULL)

+      return luaL_error(L, "invalid UTF-8 code");

+    lua_pushinteger(L, n + 1);

+    lua_pushinteger(L, code);

+    return 2;

+  }

+}

+

+

+static int iter_auxstrict (lua_State *L) {

+  return iter_aux(L, 1);

+}

+

+static int iter_auxlax (lua_State *L) {

+  return iter_aux(L, 0);

+}

+

+

+static int iter_codes (lua_State *L) {

+  int lax = lua_toboolean(L, 2);

+  luaL_checkstring(L, 1);

+  lua_pushcfunction(L, lax ? iter_auxlax : iter_auxstrict);

+  lua_pushvalue(L, 1);

+  lua_pushinteger(L, 0);

+  return 3;

+}

+

+

+/* pattern to match a single UTF-8 character */

+#define UTF8PATT	"[\0-\x7F\xC2-\xFD][\x80-\xBF]*"

+

+

+static const luaL_Reg funcs[] = {

+  {"offset", byteoffset},

+  {"codepoint", codepoint},

+  {"char", utfchar},

+  {"len", utflen},

+  {"codes", iter_codes},

+  /* placeholders */

+  {"charpattern", NULL},

+  {NULL, NULL}

+};

+

+

+LUAMOD_API int luaopen_utf8 (lua_State *L) {

+  luaL_newlib(L, funcs);

+  lua_pushlstring(L, UTF8PATT, sizeof(UTF8PATT)/sizeof(char) - 1);

+  lua_setfield(L, -2, "charpattern");

+  return 1;

+}

+

--- /dev/null

+++ b/lvm.c

@@ -1,0 +1,1829 @@

+/*

+** $Id: lvm.c $

+** Lua virtual machine

+** See Copyright Notice in lua.h

+*/

+

+#define lvm_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+#include <float.h>

+#include <limits.h>

+#include <math.h>

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+

+#include "lua.h"

+

+#include "ldebug.h"

+#include "ldo.h"

+#include "lfunc.h"

+#include "lgc.h"

+#include "lobject.h"

+#include "lopcodes.h"

+#include "lstate.h"

+#include "lstring.h"

+#include "ltable.h"

+#include "ltm.h"

+#include "lvm.h"

+

+

+/*

+** By default, use jump tables in the main interpreter loop on gcc

+** and compatible compilers.

+*/

+#if !defined(LUA_USE_JUMPTABLE)

+#if defined(__GNUC__)

+#define LUA_USE_JUMPTABLE	1

+#else

+#define LUA_USE_JUMPTABLE	0

+#endif

+#endif

+

+

+

+/* limit for table tag-method chains (to avoid infinite loops) */

+#define MAXTAGLOOP	2000

+

+

+/*

+** 'l_intfitsf' checks whether a given integer is in the range that

+** can be converted to a float without rounding. Used in comparisons.

+*/

+

+/* number of bits in the mantissa of a float */

+#define NBM		(l_floatatt(MANT_DIG))

+

+/*

+** Check whether some integers may not fit in a float, testing whether

+** (maxinteger >> NBM) > 0. (That implies (1 << NBM) <= maxinteger.)

+** (The shifts are done in parts, to avoid shifting by more than the size

+** of an integer. In a worst case, NBM == 113 for long double and

+** sizeof(long) == 32.)

+*/

+#if ((((LUA_MAXINTEGER >> (NBM / 4)) >> (NBM / 4)) >> (NBM / 4)) \

+	>> (NBM - (3 * (NBM / 4))))  >  0

+

+/* limit for integers that fit in a float */

+#define MAXINTFITSF	((lua_Unsigned)1 << NBM)

+

+/* check whether 'i' is in the interval [-MAXINTFITSF, MAXINTFITSF] */

+#define l_intfitsf(i)	((MAXINTFITSF + l_castS2U(i)) <= (2 * MAXINTFITSF))

+

+#else  /* all integers fit in a float precisely */

+

+#define l_intfitsf(i)	1

+

+#endif

+

+

+/*

+** Try to convert a value from string to a number value.

+** If the value is not a string or is a string not representing

+** a valid numeral (or if coercions from strings to numbers

+** are disabled via macro 'cvt2num'), do not modify 'result'

+** and return 0.

+*/

+static int l_strton (const TValue *obj, TValue *result) {

+  lua_assert(obj != result);

+  if (!cvt2num(obj))  /* is object not a string? */

+    return 0;

+  else

+    return (luaO_str2num(svalue(obj), result) == vslen(obj) + 1);

+}

+

+

+/*

+** Try to convert a value to a float. The float case is already handled

+** by the macro 'tonumber'.

+*/

+int luaV_tonumber_ (const TValue *obj, lua_Number *n) {

+  TValue v;

+  if (ttisinteger(obj)) {

+    *n = cast_num(ivalue(obj));

+    return 1;

+  }

+  else if (l_strton(obj, &v)) {  /* string coercible to number? */

+    *n = nvalue(&v);  /* convert result of 'luaO_str2num' to a float */

+    return 1;

+  }

+  else

+    return 0;  /* conversion failed */

+}

+

+

+/*

+** try to convert a float to an integer, rounding according to 'mode'.

+*/

+int luaV_flttointeger (lua_Number n, lua_Integer *p, F2Imod mode) {

+  lua_Number f = l_floor(n);

+  if (n != f) {  /* not an integral value? */

+    if (mode == F2Ieq) return 0;  /* fails if mode demands integral value */

+    else if (mode == F2Iceil)  /* needs ceil? */

+      f += 1;  /* convert floor to ceil (remember: n != f) */

+  }

+  return lua_numbertointeger(f, p);

+}

+

+

+/*

+** try to convert a value to an integer, rounding according to 'mode',

+** without string coercion.

+** ("Fast track" handled by macro 'tointegerns'.)

+*/

+int luaV_tointegerns (const TValue *obj, lua_Integer *p, F2Imod mode) {

+  if (ttisfloat(obj))

+    return luaV_flttointeger(fltvalue(obj), p, mode);

+  else if (ttisinteger(obj)) {

+    *p = ivalue(obj);

+    return 1;

+  }

+  else

+    return 0;

+}

+

+

+/*

+** try to convert a value to an integer.

+*/

+int luaV_tointeger (const TValue *obj, lua_Integer *p, F2Imod mode) {

+  TValue v;

+  if (l_strton(obj, &v))  /* does 'obj' point to a numerical string? */

+    obj = &v;  /* change it to point to its corresponding number */

+  return luaV_tointegerns(obj, p, mode);

+}

+

+

+/*

+** Try to convert a 'for' limit to an integer, preserving the semantics

+** of the loop. Return true if the loop must not run; otherwise, '*p'

+** gets the integer limit.

+** (The following explanation assumes a positive step; it is valid for

+** negative steps mutatis mutandis.)

+** If the limit is an integer or can be converted to an integer,

+** rounding down, that is the limit.

+** Otherwise, check whether the limit can be converted to a float. If

+** the float is too large, clip it to LUA_MAXINTEGER.  If the float

+** is too negative, the loop should not run, because any initial

+** integer value is greater than such limit; so, the function returns

+** true to signal that. (For this latter case, no integer limit would be

+** correct; even a limit of LUA_MININTEGER would run the loop once for

+** an initial value equal to LUA_MININTEGER.)

+*/

+static int forlimit (lua_State *L, lua_Integer init, const TValue *lim,

+                                   lua_Integer *p, lua_Integer step) {

+  if (!luaV_tointeger(lim, p, (step < 0 ? F2Iceil : F2Ifloor))) {

+    /* not coercible to in integer */

+    lua_Number flim;  /* try to convert to float */

+    if (!tonumber(lim, &flim)) /* cannot convert to float? */

+      luaG_forerror(L, lim, "limit");

+    /* else 'flim' is a float out of integer bounds */

+    if (luai_numlt(0, flim)) {  /* if it is positive, it is too large */

+      if (step < 0) return 1;  /* initial value must be less than it */

+      *p = LUA_MAXINTEGER;  /* truncate */

+    }

+    else {  /* it is less than min integer */

+      if (step > 0) return 1;  /* initial value must be greater than it */

+      *p = LUA_MININTEGER;  /* truncate */

+    }

+  }

+  return (step > 0 ? init > *p : init < *p);  /* not to run? */

+}

+

+

+/*

+** Prepare a numerical for loop (opcode OP_FORPREP).

+** Return true to skip the loop. Otherwise,

+** after preparation, stack will be as follows:

+**   ra : internal index (safe copy of the control variable)

+**   ra + 1 : loop counter (integer loops) or limit (float loops)

+**   ra + 2 : step

+**   ra + 3 : control variable

+*/

+static int forprep (lua_State *L, StkId ra) {

+  TValue *pinit = s2v(ra);

+  TValue *plimit = s2v(ra + 1);

+  TValue *pstep = s2v(ra + 2);

+  if (ttisinteger(pinit) && ttisinteger(pstep)) { /* integer loop? */

+    lua_Integer init = ivalue(pinit);

+    lua_Integer step = ivalue(pstep);

+    lua_Integer limit;

+    if (step == 0)

+      luaG_runerror(L, "'for' step is zero");

+    setivalue(s2v(ra + 3), init);  /* control variable */

+    if (forlimit(L, init, plimit, &limit, step))

+      return 1;  /* skip the loop */

+    else {  /* prepare loop counter */

+      lua_Unsigned count;

+      if (step > 0) {  /* ascending loop? */

+        count = l_castS2U(limit) - l_castS2U(init);

+        if (step != 1)  /* avoid division in the too common case */

+          count /= l_castS2U(step);

+      }

+      else {  /* step < 0; descending loop */

+        count = l_castS2U(init) - l_castS2U(limit);

+        /* 'step+1' avoids negating 'mininteger' */

+        count /= l_castS2U(-(step + 1)) + 1u;

+      }

+      /* store the counter in place of the limit (which won't be

+         needed anymore) */

+      setivalue(plimit, l_castU2S(count));

+    }

+  }

+  else {  /* try making all values floats */

+    lua_Number init; lua_Number limit; lua_Number step;

+    if (unlikely(!tonumber(plimit, &limit)))

+      luaG_forerror(L, plimit, "limit");

+    if (unlikely(!tonumber(pstep, &step)))

+      luaG_forerror(L, pstep, "step");

+    if (unlikely(!tonumber(pinit, &init)))

+      luaG_forerror(L, pinit, "initial value");

+    if (step == 0)

+      luaG_runerror(L, "'for' step is zero");

+    if (luai_numlt(0, step) ? luai_numlt(limit, init)

+                            : luai_numlt(init, limit))

+      return 1;  /* skip the loop */

+    else {

+      /* make sure internal values are all floats */

+      setfltvalue(plimit, limit);

+      setfltvalue(pstep, step);

+      setfltvalue(s2v(ra), init);  /* internal index */

+      setfltvalue(s2v(ra + 3), init);  /* control variable */

+    }

+  }

+  return 0;

+}

+

+

+/*

+** Execute a step of a float numerical for loop, returning

+** true iff the loop must continue. (The integer case is

+** written online with opcode OP_FORLOOP, for performance.)

+*/

+static int floatforloop (StkId ra) {

+  lua_Number step = fltvalue(s2v(ra + 2));

+  lua_Number limit = fltvalue(s2v(ra + 1));

+  lua_Number idx = fltvalue(s2v(ra));  /* internal index */

+  idx = luai_numadd(L, idx, step);  /* increment index */

+  if (luai_numlt(0, step) ? luai_numle(idx, limit)

+                          : luai_numle(limit, idx)) {

+    chgfltvalue(s2v(ra), idx);  /* update internal index */

+    setfltvalue(s2v(ra + 3), idx);  /* and control variable */

+    return 1;  /* jump back */

+  }

+  else

+    return 0;  /* finish the loop */

+}

+

+

+/*

+** Finish the table access 'val = t[key]'.

+** if 'slot' is NULL, 't' is not a table; otherwise, 'slot' points to

+** t[k] entry (which must be empty).

+*/

+void luaV_finishget (lua_State *L, const TValue *t, TValue *key, StkId val,

+                      const TValue *slot) {

+  int loop;  /* counter to avoid infinite loops */

+  const TValue *tm;  /* metamethod */

+  for (loop = 0; loop < MAXTAGLOOP; loop++) {

+    if (slot == NULL) {  /* 't' is not a table? */

+      lua_assert(!ttistable(t));

+      tm = luaT_gettmbyobj(L, t, TM_INDEX);

+      if (unlikely(notm(tm)))

+        luaG_typeerror(L, t, "index");  /* no metamethod */

+      /* else will try the metamethod */

+    }

+    else {  /* 't' is a table */

+      lua_assert(isempty(slot));

+      tm = fasttm(L, hvalue(t)->metatable, TM_INDEX);  /* table's metamethod */

+      if (tm == NULL) {  /* no metamethod? */

+        setnilvalue(s2v(val));  /* result is nil */

+        return;

+      }

+      /* else will try the metamethod */

+    }

+    if (ttisfunction(tm)) {  /* is metamethod a function? */

+      luaT_callTMres(L, tm, t, key, val);  /* call it */

+      return;

+    }

+    t = tm;  /* else try to access 'tm[key]' */

+    if (luaV_fastget(L, t, key, slot, luaH_get)) {  /* fast track? */

+      setobj2s(L, val, slot);  /* done */

+      return;

+    }

+    /* else repeat (tail call 'luaV_finishget') */

+  }

+  luaG_runerror(L, "'__index' chain too long; possible loop");

+}

+

+

+/*

+** Finish a table assignment 't[key] = val'.

+** If 'slot' is NULL, 't' is not a table.  Otherwise, 'slot' points

+** to the entry 't[key]', or to a value with an absent key if there

+** is no such entry.  (The value at 'slot' must be empty, otherwise

+** 'luaV_fastget' would have done the job.)

+*/

+void luaV_finishset (lua_State *L, const TValue *t, TValue *key,

+                     TValue *val, const TValue *slot) {

+  int loop;  /* counter to avoid infinite loops */

+  for (loop = 0; loop < MAXTAGLOOP; loop++) {

+    const TValue *tm;  /* '__newindex' metamethod */

+    if (slot != NULL) {  /* is 't' a table? */

+      Table *h = hvalue(t);  /* save 't' table */

+      lua_assert(isempty(slot));  /* slot must be empty */

+      tm = fasttm(L, h->metatable, TM_NEWINDEX);  /* get metamethod */

+      if (tm == NULL) {  /* no metamethod? */

+        if (isabstkey(slot))  /* no previous entry? */

+          slot = luaH_newkey(L, h, key);  /* create one */

+        /* no metamethod and (now) there is an entry with given key */

+        setobj2t(L, cast(TValue *, slot), val);  /* set its new value */

+        invalidateTMcache(h);

+        luaC_barrierback(L, obj2gco(h), val);

+        return;

+      }

+      /* else will try the metamethod */

+    }

+    else {  /* not a table; check metamethod */

+      tm = luaT_gettmbyobj(L, t, TM_NEWINDEX);

+      if (unlikely(notm(tm)))

+        luaG_typeerror(L, t, "index");

+    }

+    /* try the metamethod */

+    if (ttisfunction(tm)) {

+      luaT_callTM(L, tm, t, key, val);

+      return;

+    }

+    t = tm;  /* else repeat assignment over 'tm' */

+    if (luaV_fastget(L, t, key, slot, luaH_get)) {

+      luaV_finishfastset(L, t, slot, val);

+      return;  /* done */

+    }

+    /* else 'return luaV_finishset(L, t, key, val, slot)' (loop) */

+  }

+  luaG_runerror(L, "'__newindex' chain too long; possible loop");

+}

+

+

+/*

+** Compare two strings 'ls' x 'rs', returning an integer less-equal-

+** -greater than zero if 'ls' is less-equal-greater than 'rs'.

+** The code is a little tricky because it allows '\0' in the strings

+** and it uses 'strcoll' (to respect locales) for each segments

+** of the strings.

+*/

+static int l_strcmp (const TString *ls, const TString *rs) {

+  const char *l = getstr(ls);

+  size_t ll = tsslen(ls);

+  const char *r = getstr(rs);

+  size_t lr = tsslen(rs);

+  for (;;) {  /* for each segment */

+    int temp = strcoll(l, r);

+    if (temp != 0)  /* not equal? */

+      return temp;  /* done */

+    else {  /* strings are equal up to a '\0' */

+      size_t len = strlen(l);  /* index of first '\0' in both strings */

+      if (len == lr)  /* 'rs' is finished? */

+        return (len == ll) ? 0 : 1;  /* check 'ls' */

+      else if (len == ll)  /* 'ls' is finished? */

+        return -1;  /* 'ls' is less than 'rs' ('rs' is not finished) */

+      /* both strings longer than 'len'; go on comparing after the '\0' */

+      len++;

+      l += len; ll -= len; r += len; lr -= len;

+    }

+  }

+}

+

+

+/*

+** Check whether integer 'i' is less than float 'f'. If 'i' has an

+** exact representation as a float ('l_intfitsf'), compare numbers as

+** floats. Otherwise, use the equivalence 'i < f <=> i < ceil(f)'.

+** If 'ceil(f)' is out of integer range, either 'f' is greater than

+** all integers or less than all integers.

+** (The test with 'l_intfitsf' is only for performance; the else

+** case is correct for all values, but it is slow due to the conversion

+** from float to int.)

+** When 'f' is NaN, comparisons must result in false.

+*/

+static int LTintfloat (lua_Integer i, lua_Number f) {

+  if (l_intfitsf(i))

+    return luai_numlt(cast_num(i), f);  /* compare them as floats */

+  else {  /* i < f <=> i < ceil(f) */

+    lua_Integer fi;

+    if (luaV_flttointeger(f, &fi, F2Iceil))  /* fi = ceil(f) */

+      return i < fi;   /* compare them as integers */

+    else  /* 'f' is either greater or less than all integers */

+      return f > 0;  /* greater? */

+  }

+}

+

+

+/*

+** Check whether integer 'i' is less than or equal to float 'f'.

+** See comments on previous function.

+*/

+static int LEintfloat (lua_Integer i, lua_Number f) {

+  if (l_intfitsf(i))

+    return luai_numle(cast_num(i), f);  /* compare them as floats */

+  else {  /* i <= f <=> i <= floor(f) */

+    lua_Integer fi;

+    if (luaV_flttointeger(f, &fi, F2Ifloor))  /* fi = floor(f) */

+      return i <= fi;   /* compare them as integers */

+    else  /* 'f' is either greater or less than all integers */

+      return f > 0;  /* greater? */

+  }

+}

+

+

+/*

+** Check whether float 'f' is less than integer 'i'.

+** See comments on previous function.

+*/

+static int LTfloatint (lua_Number f, lua_Integer i) {

+  if (l_intfitsf(i))

+    return luai_numlt(f, cast_num(i));  /* compare them as floats */

+  else {  /* f < i <=> floor(f) < i */

+    lua_Integer fi;

+    if (luaV_flttointeger(f, &fi, F2Ifloor))  /* fi = floor(f) */

+      return fi < i;   /* compare them as integers */

+    else  /* 'f' is either greater or less than all integers */

+      return f < 0;  /* less? */

+  }

+}

+

+

+/*

+** Check whether float 'f' is less than or equal to integer 'i'.

+** See comments on previous function.

+*/

+static int LEfloatint (lua_Number f, lua_Integer i) {

+  if (l_intfitsf(i))

+    return luai_numle(f, cast_num(i));  /* compare them as floats */

+  else {  /* f <= i <=> ceil(f) <= i */

+    lua_Integer fi;

+    if (luaV_flttointeger(f, &fi, F2Iceil))  /* fi = ceil(f) */

+      return fi <= i;   /* compare them as integers */

+    else  /* 'f' is either greater or less than all integers */

+      return f < 0;  /* less? */

+  }

+}

+

+

+/*

+** Return 'l < r', for numbers.

+*/

+static int LTnum (const TValue *l, const TValue *r) {

+  lua_assert(ttisnumber(l) && ttisnumber(r));

+  if (ttisinteger(l)) {

+    lua_Integer li = ivalue(l);

+    if (ttisinteger(r))

+      return li < ivalue(r);  /* both are integers */

+    else  /* 'l' is int and 'r' is float */

+      return LTintfloat(li, fltvalue(r));  /* l < r ? */

+  }

+  else {

+    lua_Number lf = fltvalue(l);  /* 'l' must be float */

+    if (ttisfloat(r))

+      return luai_numlt(lf, fltvalue(r));  /* both are float */

+    else  /* 'l' is float and 'r' is int */

+      return LTfloatint(lf, ivalue(r));

+  }

+}

+

+

+/*

+** Return 'l <= r', for numbers.

+*/

+static int LEnum (const TValue *l, const TValue *r) {

+  lua_assert(ttisnumber(l) && ttisnumber(r));

+  if (ttisinteger(l)) {

+    lua_Integer li = ivalue(l);

+    if (ttisinteger(r))

+      return li <= ivalue(r);  /* both are integers */

+    else  /* 'l' is int and 'r' is float */

+      return LEintfloat(li, fltvalue(r));  /* l <= r ? */

+  }

+  else {

+    lua_Number lf = fltvalue(l);  /* 'l' must be float */

+    if (ttisfloat(r))

+      return luai_numle(lf, fltvalue(r));  /* both are float */

+    else  /* 'l' is float and 'r' is int */

+      return LEfloatint(lf, ivalue(r));

+  }

+}

+

+

+/*

+** return 'l < r' for non-numbers.

+*/

+static int lessthanothers (lua_State *L, const TValue *l, const TValue *r) {

+  lua_assert(!ttisnumber(l) || !ttisnumber(r));

+  if (ttisstring(l) && ttisstring(r))  /* both are strings? */

+    return l_strcmp(tsvalue(l), tsvalue(r)) < 0;

+  else

+    return luaT_callorderTM(L, l, r, TM_LT);

+}

+

+

+/*

+** Main operation less than; return 'l < r'.

+*/

+int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) {

+  if (ttisnumber(l) && ttisnumber(r))  /* both operands are numbers? */

+    return LTnum(l, r);

+  else return lessthanothers(L, l, r);

+}

+

+

+/*

+** return 'l <= r' for non-numbers.

+*/

+static int lessequalothers (lua_State *L, const TValue *l, const TValue *r) {

+  lua_assert(!ttisnumber(l) || !ttisnumber(r));

+  if (ttisstring(l) && ttisstring(r))  /* both are strings? */

+    return l_strcmp(tsvalue(l), tsvalue(r)) <= 0;

+  else

+    return luaT_callorderTM(L, l, r, TM_LE);

+}

+

+

+/*

+** Main operation less than or equal to; return 'l <= r'.

+*/

+int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r) {

+  if (ttisnumber(l) && ttisnumber(r))  /* both operands are numbers? */

+    return LEnum(l, r);

+  else return lessequalothers(L, l, r);

+}

+

+

+/*

+** Main operation for equality of Lua values; return 't1 == t2'.

+** L == NULL means raw equality (no metamethods)

+*/

+int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2) {

+  const TValue *tm;

+  if (ttypetag(t1) != ttypetag(t2)) {  /* not the same variant? */

+    if (ttype(t1) != ttype(t2) || ttype(t1) != LUA_TNUMBER)

+      return 0;  /* only numbers can be equal with different variants */

+    else {  /* two numbers with different variants */

+      lua_Integer i1, i2;  /* compare them as integers */

+      return (tointegerns(t1, &i1) && tointegerns(t2, &i2) && i1 == i2);

+    }

+  }

+  /* values have same type and same variant */

+  switch (ttypetag(t1)) {

+    case LUA_VNIL: case LUA_VFALSE: case LUA_VTRUE: return 1;

+    case LUA_VNUMINT: return (ivalue(t1) == ivalue(t2));

+    case LUA_VNUMFLT: return luai_numeq(fltvalue(t1), fltvalue(t2));

+    case LUA_VLIGHTUSERDATA: return pvalue(t1) == pvalue(t2);

+    case LUA_VLCF: return fvalue(t1) == fvalue(t2);

+    case LUA_VSHRSTR: return eqshrstr(tsvalue(t1), tsvalue(t2));

+    case LUA_VLNGSTR: return luaS_eqlngstr(tsvalue(t1), tsvalue(t2));

+    case LUA_VUSERDATA: {

+      if (uvalue(t1) == uvalue(t2)) return 1;

+      else if (L == NULL) return 0;

+      tm = fasttm(L, uvalue(t1)->metatable, TM_EQ);

+      if (tm == NULL)

+        tm = fasttm(L, uvalue(t2)->metatable, TM_EQ);

+      break;  /* will try TM */

+    }

+    case LUA_VTABLE: {

+      if (hvalue(t1) == hvalue(t2)) return 1;

+      else if (L == NULL) return 0;

+      tm = fasttm(L, hvalue(t1)->metatable, TM_EQ);

+      if (tm == NULL)

+        tm = fasttm(L, hvalue(t2)->metatable, TM_EQ);

+      break;  /* will try TM */

+    }

+    default:

+      return gcvalue(t1) == gcvalue(t2);

+  }

+  if (tm == NULL)  /* no TM? */

+    return 0;  /* objects are different */

+  else {

+    luaT_callTMres(L, tm, t1, t2, L->top);  /* call TM */

+    return !l_isfalse(s2v(L->top));

+  }

+}

+

+

+/* macro used by 'luaV_concat' to ensure that element at 'o' is a string */

+#define tostring(L,o)  \

+	(ttisstring(o) || (cvt2str(o) && (luaO_tostring(L, o), 1)))

+

+#define isemptystr(o)	(ttisshrstring(o) && tsvalue(o)->shrlen == 0)

+

+/* copy strings in stack from top - n up to top - 1 to buffer */

+static void copy2buff (StkId top, int n, char *buff) {

+  size_t tl = 0;  /* size already copied */

+  do {

+    size_t l = vslen(s2v(top - n));  /* length of string being copied */

+    memcpy(buff + tl, svalue(s2v(top - n)), l * sizeof(char));

+    tl += l;

+  } while (--n > 0);

+}

+

+

+/*

+** Main operation for concatenation: concat 'total' values in the stack,

+** from 'L->top - total' up to 'L->top - 1'.

+*/

+void luaV_concat (lua_State *L, int total) {

+  if (total == 1)

+    return;  /* "all" values already concatenated */

+  do {

+    StkId top = L->top;

+    int n = 2;  /* number of elements handled in this pass (at least 2) */

+    if (!(ttisstring(s2v(top - 2)) || cvt2str(s2v(top - 2))) ||

+        !tostring(L, s2v(top - 1)))

+      luaT_tryconcatTM(L);

+    else if (isemptystr(s2v(top - 1)))  /* second operand is empty? */

+      cast_void(tostring(L, s2v(top - 2)));  /* result is first operand */

+    else if (isemptystr(s2v(top - 2))) {  /* first operand is empty string? */

+      setobjs2s(L, top - 2, top - 1);  /* result is second op. */

+    }

+    else {

+      /* at least two non-empty string values; get as many as possible */

+      size_t tl = vslen(s2v(top - 1));

+      TString *ts;

+      /* collect total length and number of strings */

+      for (n = 1; n < total && tostring(L, s2v(top - n - 1)); n++) {

+        size_t l = vslen(s2v(top - n - 1));

+        if (unlikely(l >= (MAX_SIZE/sizeof(char)) - tl))

+          luaG_runerror(L, "string length overflow");

+        tl += l;

+      }

+      if (tl <= LUAI_MAXSHORTLEN) {  /* is result a short string? */

+        char buff[LUAI_MAXSHORTLEN];

+        copy2buff(top, n, buff);  /* copy strings to buffer */

+        ts = luaS_newlstr(L, buff, tl);

+      }

+      else {  /* long string; copy strings directly to final result */

+        ts = luaS_createlngstrobj(L, tl);

+        copy2buff(top, n, getstr(ts));

+      }

+      setsvalue2s(L, top - n, ts);  /* create result */

+    }

+    total -= n-1;  /* got 'n' strings to create 1 new */

+    L->top -= n-1;  /* popped 'n' strings and pushed one */

+  } while (total > 1);  /* repeat until only 1 result left */

+}

+

+

+/*

+** Main operation 'ra = #rb'.

+*/

+void luaV_objlen (lua_State *L, StkId ra, const TValue *rb) {

+  const TValue *tm;

+  switch (ttypetag(rb)) {

+    case LUA_VTABLE: {

+      Table *h = hvalue(rb);

+      tm = fasttm(L, h->metatable, TM_LEN);

+      if (tm) break;  /* metamethod? break switch to call it */

+      setivalue(s2v(ra), luaH_getn(h));  /* else primitive len */

+      return;

+    }

+    case LUA_VSHRSTR: {

+      setivalue(s2v(ra), tsvalue(rb)->shrlen);

+      return;

+    }

+    case LUA_VLNGSTR: {

+      setivalue(s2v(ra), tsvalue(rb)->u.lnglen);

+      return;

+    }

+    default: {  /* try metamethod */

+      tm = luaT_gettmbyobj(L, rb, TM_LEN);

+      if (unlikely(notm(tm)))  /* no metamethod? */

+        luaG_typeerror(L, rb, "get length of");

+      break;

+    }

+  }

+  luaT_callTMres(L, tm, rb, rb, ra);

+}

+

+

+/*

+** Integer division; return 'm // n', that is, floor(m/n).

+** C division truncates its result (rounds towards zero).

+** 'floor(q) == trunc(q)' when 'q >= 0' or when 'q' is integer,

+** otherwise 'floor(q) == trunc(q) - 1'.

+*/

+lua_Integer luaV_idiv (lua_State *L, lua_Integer m, lua_Integer n) {

+  if (unlikely(l_castS2U(n) + 1u <= 1u)) {  /* special cases: -1 or 0 */

+    if (n == 0)

+      luaG_runerror(L, "attempt to divide by zero");

+    return intop(-, 0, m);   /* n==-1; avoid overflow with 0x80000...//-1 */

+  }

+  else {

+    lua_Integer q = m / n;  /* perform C division */

+    if ((m ^ n) < 0 && m % n != 0)  /* 'm/n' would be negative non-integer? */

+      q -= 1;  /* correct result for different rounding */

+    return q;

+  }

+}

+

+

+/*

+** Integer modulus; return 'm % n'. (Assume that C '%' with

+** negative operands follows C99 behavior. See previous comment

+** about luaV_idiv.)

+*/

+lua_Integer luaV_mod (lua_State *L, lua_Integer m, lua_Integer n) {

+  if (unlikely(l_castS2U(n) + 1u <= 1u)) {  /* special cases: -1 or 0 */

+    if (n == 0)

+      luaG_runerror(L, "attempt to perform 'n%%0'");

+    return 0;   /* m % -1 == 0; avoid overflow with 0x80000...%-1 */

+  }

+  else {

+    lua_Integer r = m % n;

+    if (r != 0 && (r ^ n) < 0)  /* 'm/n' would be non-integer negative? */

+      r += n;  /* correct result for different rounding */

+    return r;

+  }

+}

+

+

+/*

+** Float modulus

+*/

+lua_Number luaV_modf (lua_State *L, lua_Number m, lua_Number n) {

+  lua_Number r;

+  luai_nummod(L, m, n, r);

+  return r;

+}

+

+

+/* number of bits in an integer */

+#define NBITS	cast_int(sizeof(lua_Integer) * CHAR_BIT)

+

+/*

+** Shift left operation. (Shift right just negates 'y'.)

+*/

+#define luaV_shiftr(x,y)	luaV_shiftl(x,-(y))

+

+lua_Integer luaV_shiftl (lua_Integer x, lua_Integer y) {

+  if (y < 0) {  /* shift right? */

+    if (y <= -NBITS) return 0;

+    else return intop(>>, x, -y);

+  }

+  else {  /* shift left */

+    if (y >= NBITS) return 0;

+    else return intop(<<, x, y);

+  }

+}

+

+

+/*

+** create a new Lua closure, push it in the stack, and initialize

+** its upvalues.

+*/

+static void pushclosure (lua_State *L, Proto *p, UpVal **encup, StkId base,

+                         StkId ra) {

+  int nup = p->sizeupvalues;

+  Upvaldesc *uv = p->upvalues;

+  int i;

+  LClosure *ncl = luaF_newLclosure(L, nup);

+  ncl->p = p;

+  setclLvalue2s(L, ra, ncl);  /* anchor new closure in stack */

+  for (i = 0; i < nup; i++) {  /* fill in its upvalues */

+    if (uv[i].instack)  /* upvalue refers to local variable? */

+      ncl->upvals[i] = luaF_findupval(L, base + uv[i].idx);

+    else  /* get upvalue from enclosing function */

+      ncl->upvals[i] = encup[uv[i].idx];

+    luaC_objbarrier(L, ncl, ncl->upvals[i]);

+  }

+}

+

+

+/*

+** finish execution of an opcode interrupted by a yield

+*/

+void luaV_finishOp (lua_State *L) {

+  CallInfo *ci = L->ci;

+  StkId base = ci->func + 1;

+  Instruction inst = *(ci->u.l.savedpc - 1);  /* interrupted instruction */

+  OpCode op = GET_OPCODE(inst);

+  switch (op) {  /* finish its execution */

+    case OP_MMBIN: case OP_MMBINI: case OP_MMBINK: {

+      setobjs2s(L, base + GETARG_A(*(ci->u.l.savedpc - 2)), --L->top);

+      break;

+    }

+    case OP_UNM: case OP_BNOT: case OP_LEN:

+    case OP_GETTABUP: case OP_GETTABLE: case OP_GETI:

+    case OP_GETFIELD: case OP_SELF: {

+      setobjs2s(L, base + GETARG_A(inst), --L->top);

+      break;

+    }

+    case OP_LT: case OP_LE:

+    case OP_LTI: case OP_LEI:

+    case OP_GTI: case OP_GEI:

+    case OP_EQ: {  /* note that 'OP_EQI'/'OP_EQK' cannot yield */

+      int res = !l_isfalse(s2v(L->top - 1));

+      L->top--;

+#if defined(LUA_COMPAT_LT_LE)

+      if (ci->callstatus & CIST_LEQ) {  /* "<=" using "<" instead? */

+        ci->callstatus ^= CIST_LEQ;  /* clear mark */

+        res = !res;  /* negate result */

+      }

+#endif

+      lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_JMP);

+      if (res != GETARG_k(inst))  /* condition failed? */

+        ci->u.l.savedpc++;  /* skip jump instruction */

+      break;

+    }

+    case OP_CONCAT: {

+      StkId top = L->top - 1;  /* top when 'luaT_tryconcatTM' was called */

+      int a = GETARG_A(inst);      /* first element to concatenate */

+      int total = cast_int(top - 1 - (base + a));  /* yet to concatenate */

+      setobjs2s(L, top - 2, top);  /* put TM result in proper position */

+      L->top = top - 1;  /* top is one after last element (at top-2) */

+      luaV_concat(L, total);  /* concat them (may yield again) */

+      break;

+    }

+    default: {

+      /* only these other opcodes can yield */

+      lua_assert(op == OP_TFORCALL || op == OP_CALL ||

+           op == OP_TAILCALL || op == OP_SETTABUP || op == OP_SETTABLE ||

+           op == OP_SETI || op == OP_SETFIELD);

+      break;

+    }

+  }

+}

+

+

+

+

+/*

+** {==================================================================

+** Macros for arithmetic/bitwise/comparison opcodes in 'luaV_execute'

+** ===================================================================

+*/

+

+#define l_addi(L,a,b)	intop(+, a, b)

+#define l_subi(L,a,b)	intop(-, a, b)

+#define l_muli(L,a,b)	intop(*, a, b)

+#define l_band(a,b)	intop(&, a, b)

+#define l_bor(a,b)	intop(|, a, b)

+#define l_bxor(a,b)	intop(^, a, b)

+

+#define l_lti(a,b)	(a < b)

+#define l_lei(a,b)	(a <= b)

+#define l_gti(a,b)	(a > b)

+#define l_gei(a,b)	(a >= b)

+

+

+/*

+** Arithmetic operations with immediate operands. 'iop' is the integer

+** operation, 'fop' is the float operation.

+*/

+#define op_arithI(L,iop,fop) {  \

+  TValue *v1 = vRB(i);  \

+  int imm = GETARG_sC(i);  \

+  if (ttisinteger(v1)) {  \

+    lua_Integer iv1 = ivalue(v1);  \

+    pc++; setivalue(s2v(ra), iop(L, iv1, imm));  \

+  }  \

+  else if (ttisfloat(v1)) {  \

+    lua_Number nb = fltvalue(v1);  \

+    lua_Number fimm = cast_num(imm);  \

+    pc++; setfltvalue(s2v(ra), fop(L, nb, fimm)); \

+  }}

+

+

+/*

+** Auxiliary function for arithmetic operations over floats and others

+** with two register operands.

+*/

+#define op_arithf_aux(L,v1,v2,fop) {  \

+  lua_Number n1; lua_Number n2;  \

+  if (tonumberns(v1, n1) && tonumberns(v2, n2)) {  \

+    pc++; setfltvalue(s2v(ra), fop(L, n1, n2));  \

+  }}

+

+

+/*

+** Arithmetic operations over floats and others with register operands.

+*/

+#define op_arithf(L,fop) {  \

+  TValue *v1 = vRB(i);  \

+  TValue *v2 = vRC(i);  \

+  op_arithf_aux(L, v1, v2, fop); }

+

+

+/*

+** Arithmetic operations with K operands for floats.

+*/

+#define op_arithfK(L,fop) {  \

+  TValue *v1 = vRB(i);  \

+  TValue *v2 = KC(i);  \

+  op_arithf_aux(L, v1, v2, fop); }

+

+

+/*

+** Arithmetic operations over integers and floats.

+*/

+#define op_arith_aux(L,v1,v2,iop,fop) {  \

+  if (ttisinteger(v1) && ttisinteger(v2)) {  \

+    lua_Integer i1 = ivalue(v1); lua_Integer i2 = ivalue(v2);  \

+    pc++; setivalue(s2v(ra), iop(L, i1, i2));  \

+  }  \

+  else op_arithf_aux(L, v1, v2, fop); }

+

+

+/*

+** Arithmetic operations with register operands.

+*/

+#define op_arith(L,iop,fop) {  \

+  TValue *v1 = vRB(i);  \

+  TValue *v2 = vRC(i);  \

+  op_arith_aux(L, v1, v2, iop, fop); }

+

+

+/*

+** Arithmetic operations with K operands.

+*/

+#define op_arithK(L,iop,fop) {  \

+  TValue *v1 = vRB(i);  \

+  TValue *v2 = KC(i);  \

+  op_arith_aux(L, v1, v2, iop, fop); }

+

+

+/*

+** Bitwise operations with constant operand.

+*/

+#define op_bitwiseK(L,op) {  \

+  TValue *v1 = vRB(i);  \

+  TValue *v2 = KC(i);  \

+  lua_Integer i1;  \

+  lua_Integer i2 = ivalue(v2);  \

+  if (tointegerns(v1, &i1)) {  \

+    pc++; setivalue(s2v(ra), op(i1, i2));  \

+  }}

+

+

+/*

+** Bitwise operations with register operands.

+*/

+#define op_bitwise(L,op) {  \

+  TValue *v1 = vRB(i);  \

+  TValue *v2 = vRC(i);  \

+  lua_Integer i1; lua_Integer i2;  \

+  if (tointegerns(v1, &i1) && tointegerns(v2, &i2)) {  \

+    pc++; setivalue(s2v(ra), op(i1, i2));  \

+  }}

+

+

+/*

+** Order operations with register operands. 'opn' actually works

+** for all numbers, but the fast track improves performance for

+** integers.

+*/

+#define op_order(L,opi,opn,other) {  \

+        int cond;  \

+        TValue *rb = vRB(i);  \

+        if (ttisinteger(s2v(ra)) && ttisinteger(rb)) {  \

+          lua_Integer ia = ivalue(s2v(ra));  \

+          lua_Integer ib = ivalue(rb);  \

+          cond = opi(ia, ib);  \

+        }  \

+        else if (ttisnumber(s2v(ra)) && ttisnumber(rb))  \

+          cond = opn(s2v(ra), rb);  \

+        else  \

+          Protect(cond = other(L, s2v(ra), rb));  \

+        docondjump(); }

+

+

+/*

+** Order operations with immediate operand. (Immediate operand is

+** always small enough to have an exact representation as a float.)

+*/

+#define op_orderI(L,opi,opf,inv,tm) {  \

+        int cond;  \

+        int im = GETARG_sB(i);  \

+        if (ttisinteger(s2v(ra)))  \

+          cond = opi(ivalue(s2v(ra)), im);  \

+        else if (ttisfloat(s2v(ra))) {  \

+          lua_Number fa = fltvalue(s2v(ra));  \

+          lua_Number fim = cast_num(im);  \

+          cond = opf(fa, fim);  \

+        }  \

+        else {  \

+          int isf = GETARG_C(i);  \

+          Protect(cond = luaT_callorderiTM(L, s2v(ra), im, inv, isf, tm));  \

+        }  \

+        docondjump(); }

+

+/* }================================================================== */

+

+

+/*

+** {==================================================================

+** Function 'luaV_execute': main interpreter loop

+** ===================================================================

+*/

+

+/*

+** some macros for common tasks in 'luaV_execute'

+*/

+

+

+#define RA(i)	(base+GETARG_A(i))

+#define RB(i)	(base+GETARG_B(i))

+#define vRB(i)	s2v(RB(i))

+#define KB(i)	(k+GETARG_B(i))

+#define RC(i)	(base+GETARG_C(i))

+#define vRC(i)	s2v(RC(i))

+#define KC(i)	(k+GETARG_C(i))

+#define RKC(i)	((TESTARG_k(i)) ? k + GETARG_C(i) : s2v(base + GETARG_C(i)))

+

+

+

+#define updatetrap(ci)  (trap = ci->u.l.trap)

+

+#define updatebase(ci)	(base = ci->func + 1)

+

+

+#define updatestack(ci) { if (trap) { updatebase(ci); ra = RA(i); } }

+

+

+/*

+** Execute a jump instruction. The 'updatetrap' allows signals to stop

+** tight loops. (Without it, the local copy of 'trap' could never change.)

+*/

+#define dojump(ci,i,e)	{ pc += GETARG_sJ(i) + e; updatetrap(ci); }

+

+

+/* for test instructions, execute the jump instruction that follows it */

+#define donextjump(ci)	{ Instruction ni = *pc; dojump(ci, ni, 1); }

+

+/*

+** do a conditional jump: skip next instruction if 'cond' is not what

+** was expected (parameter 'k'), else do next instruction, which must

+** be a jump.

+*/

+#define docondjump()	if (cond != GETARG_k(i)) pc++; else donextjump(ci);

+

+

+/*

+** Correct global 'pc'.

+*/

+#define savepc(L)	(ci->u.l.savedpc = pc)

+

+

+/*

+** Whenever code can raise errors, the global 'pc' and the global

+** 'top' must be correct to report occasional errors.

+*/

+#define savestate(L,ci)		(savepc(L), L->top = ci->top)

+

+

+/*

+** Protect code that, in general, can raise errors, reallocate the

+** stack, and change the hooks.

+*/

+#define Protect(exp)  (savestate(L,ci), (exp), updatetrap(ci))

+

+/* special version that does not change the top */

+#define ProtectNT(exp)  (savepc(L), (exp), updatetrap(ci))

+

+/*

+** Protect code that can only raise errors. (That is, it cannnot change

+** the stack or hooks.)

+*/

+#define halfProtect(exp)  (savestate(L,ci), (exp))

+

+/* 'c' is the limit of live values in the stack */

+#define checkGC(L,c)  \

+	{ luaC_condGC(L, (savepc(L), L->top = (c)), \

+                         updatetrap(ci)); \

+           luai_threadyield(L); }

+

+

+/* fetch an instruction and prepare its execution */

+#define vmfetch()	{ \

+  if (trap) {  /* stack reallocation or hooks? */ \

+    trap = luaG_traceexec(L, pc);  /* handle hooks */ \

+    updatebase(ci);  /* correct stack */ \

+  } \

+  i = *(pc++); \

+  ra = RA(i); /* WARNING: any stack reallocation invalidates 'ra' */ \

+}

+

+#define vmdispatch(o)	switch(o)

+#define vmcase(l)	case l:

+#define vmbreak		break

+

+

+void luaV_execute (lua_State *L, CallInfo *ci) {

+  LClosure *cl;

+  TValue *k;

+  StkId base;

+  const Instruction *pc;

+  int trap;

+#if LUA_USE_JUMPTABLE

+#include "ljumptab.h"

+#endif

+ startfunc:

+  trap = L->hookmask;

+ returning:  /* trap already set */

+  cl = clLvalue(s2v(ci->func));

+  k = cl->p->k;

+  pc = ci->u.l.savedpc;

+  if (trap) {

+    if (pc == cl->p->code) {  /* first instruction (not resuming)? */

+      if (cl->p->is_vararg)

+        trap = 0;  /* hooks will start after VARARGPREP instruction */

+      else  /* check 'call' hook */

+        luaD_hookcall(L, ci);

+    }

+    ci->u.l.trap = 1;  /* assume trap is on, for now */

+  }

+  base = ci->func + 1;

+  /* main loop of interpreter */

+  for (;;) {

+    Instruction i;  /* instruction being executed */

+    StkId ra;  /* instruction's A register */

+    vmfetch();

+    lua_assert(base == ci->func + 1);

+    lua_assert(base <= L->top && L->top < L->stack_last);

+    /* invalidate top for instructions not expecting it */

+    lua_assert(isIT(i) || (cast_void(L->top = base), 1));

+    vmdispatch (GET_OPCODE(i)) {

+      vmcase(OP_MOVE) {

+        setobjs2s(L, ra, RB(i));

+        vmbreak;

+      }

+      vmcase(OP_LOADI) {

+        lua_Integer b = GETARG_sBx(i);

+        setivalue(s2v(ra), b);

+        vmbreak;

+      }

+      vmcase(OP_LOADF) {

+        int b = GETARG_sBx(i);

+        setfltvalue(s2v(ra), cast_num(b));

+        vmbreak;

+      }

+      vmcase(OP_LOADK) {

+        TValue *rb = k + GETARG_Bx(i);

+        setobj2s(L, ra, rb);

+        vmbreak;

+      }

+      vmcase(OP_LOADKX) {

+        TValue *rb;

+        rb = k + GETARG_Ax(*pc); pc++;

+        setobj2s(L, ra, rb);

+        vmbreak;

+      }

+      vmcase(OP_LOADFALSE) {

+        setbfvalue(s2v(ra));

+        vmbreak;

+      }

+      vmcase(OP_LFALSESKIP) {

+        setbfvalue(s2v(ra));

+        pc++;  /* skip next instruction */

+        vmbreak;

+      }

+      vmcase(OP_LOADTRUE) {

+        setbtvalue(s2v(ra));

+        vmbreak;

+      }

+      vmcase(OP_LOADNIL) {

+        int b = GETARG_B(i);

+        do {

+          setnilvalue(s2v(ra++));

+        } while (b--);

+        vmbreak;

+      }

+      vmcase(OP_GETUPVAL) {

+        int b = GETARG_B(i);

+        setobj2s(L, ra, cl->upvals[b]->v);

+        vmbreak;

+      }

+      vmcase(OP_SETUPVAL) {

+        UpVal *uv = cl->upvals[GETARG_B(i)];

+        setobj(L, uv->v, s2v(ra));

+        luaC_barrier(L, uv, s2v(ra));

+        vmbreak;

+      }

+      vmcase(OP_GETTABUP) {

+        const TValue *slot;

+        TValue *upval = cl->upvals[GETARG_B(i)]->v;

+        TValue *rc = KC(i);

+        TString *key = tsvalue(rc);  /* key must be a string */

+        if (luaV_fastget(L, upval, key, slot, luaH_getshortstr)) {

+          setobj2s(L, ra, slot);

+        }

+        else

+          Protect(luaV_finishget(L, upval, rc, ra, slot));

+        vmbreak;

+      }

+      vmcase(OP_GETTABLE) {

+        const TValue *slot;

+        TValue *rb = vRB(i);

+        TValue *rc = vRC(i);

+        lua_Unsigned n;

+        if (ttisinteger(rc)  /* fast track for integers? */

+            ? (cast_void(n = ivalue(rc)), luaV_fastgeti(L, rb, n, slot))

+            : luaV_fastget(L, rb, rc, slot, luaH_get)) {

+          setobj2s(L, ra, slot);

+        }

+        else

+          Protect(luaV_finishget(L, rb, rc, ra, slot));

+        vmbreak;

+      }

+      vmcase(OP_GETI) {

+        const TValue *slot;

+        TValue *rb = vRB(i);

+        int c = GETARG_C(i);

+        if (luaV_fastgeti(L, rb, c, slot)) {

+          setobj2s(L, ra, slot);

+        }

+        else {

+          TValue key;

+          setivalue(&key, c);

+          Protect(luaV_finishget(L, rb, &key, ra, slot));

+        }

+        vmbreak;

+      }

+      vmcase(OP_GETFIELD) {

+        const TValue *slot;

+        TValue *rb = vRB(i);

+        TValue *rc = KC(i);

+        TString *key = tsvalue(rc);  /* key must be a string */

+        if (luaV_fastget(L, rb, key, slot, luaH_getshortstr)) {

+          setobj2s(L, ra, slot);

+        }

+        else

+          Protect(luaV_finishget(L, rb, rc, ra, slot));

+        vmbreak;

+      }

+      vmcase(OP_SETTABUP) {

+        const TValue *slot;

+        TValue *upval = cl->upvals[GETARG_A(i)]->v;

+        TValue *rb = KB(i);

+        TValue *rc = RKC(i);

+        TString *key = tsvalue(rb);  /* key must be a string */

+        if (luaV_fastget(L, upval, key, slot, luaH_getshortstr)) {

+          luaV_finishfastset(L, upval, slot, rc);

+        }

+        else

+          Protect(luaV_finishset(L, upval, rb, rc, slot));

+        vmbreak;

+      }

+      vmcase(OP_SETTABLE) {

+        const TValue *slot;

+        TValue *rb = vRB(i);  /* key (table is in 'ra') */

+        TValue *rc = RKC(i);  /* value */

+        lua_Unsigned n;

+        if (ttisinteger(rb)  /* fast track for integers? */

+            ? (cast_void(n = ivalue(rb)), luaV_fastgeti(L, s2v(ra), n, slot))

+            : luaV_fastget(L, s2v(ra), rb, slot, luaH_get)) {

+          luaV_finishfastset(L, s2v(ra), slot, rc);

+        }

+        else

+          Protect(luaV_finishset(L, s2v(ra), rb, rc, slot));

+        vmbreak;

+      }

+      vmcase(OP_SETI) {

+        const TValue *slot;

+        int c = GETARG_B(i);

+        TValue *rc = RKC(i);

+        if (luaV_fastgeti(L, s2v(ra), c, slot)) {

+          luaV_finishfastset(L, s2v(ra), slot, rc);

+        }

+        else {

+          TValue key;

+          setivalue(&key, c);

+          Protect(luaV_finishset(L, s2v(ra), &key, rc, slot));

+        }

+        vmbreak;

+      }

+      vmcase(OP_SETFIELD) {

+        const TValue *slot;

+        TValue *rb = KB(i);

+        TValue *rc = RKC(i);

+        TString *key = tsvalue(rb);  /* key must be a string */

+        if (luaV_fastget(L, s2v(ra), key, slot, luaH_getshortstr)) {

+          luaV_finishfastset(L, s2v(ra), slot, rc);

+        }

+        else

+          Protect(luaV_finishset(L, s2v(ra), rb, rc, slot));

+        vmbreak;

+      }

+      vmcase(OP_NEWTABLE) {

+        int b = GETARG_B(i);  /* log2(hash size) + 1 */

+        int c = GETARG_C(i);  /* array size */

+        Table *t;

+        if (b > 0)

+          b = 1 << (b - 1);  /* size is 2^(b - 1) */

+        lua_assert((!TESTARG_k(i)) == (GETARG_Ax(*pc) == 0));

+        if (TESTARG_k(i))  /* non-zero extra argument? */

+          c += GETARG_Ax(*pc) * (MAXARG_C + 1);  /* add it to size */

+        pc++;  /* skip extra argument */

+        L->top = ra + 1;  /* correct top in case of emergency GC */

+        t = luaH_new(L);  /* memory allocation */

+        sethvalue2s(L, ra, t);

+        if (b != 0 || c != 0)

+          luaH_resize(L, t, c, b);  /* idem */

+        checkGC(L, ra + 1);

+        vmbreak;

+      }

+      vmcase(OP_SELF) {

+        const TValue *slot;

+        TValue *rb = vRB(i);

+        TValue *rc = RKC(i);

+        TString *key = tsvalue(rc);  /* key must be a string */

+        setobj2s(L, ra + 1, rb);

+        if (luaV_fastget(L, rb, key, slot, luaH_getstr)) {

+          setobj2s(L, ra, slot);

+        }

+        else

+          Protect(luaV_finishget(L, rb, rc, ra, slot));

+        vmbreak;

+      }

+      vmcase(OP_ADDI) {

+        op_arithI(L, l_addi, luai_numadd);

+        vmbreak;

+      }

+      vmcase(OP_ADDK) {

+        op_arithK(L, l_addi, luai_numadd);

+        vmbreak;

+      }

+      vmcase(OP_SUBK) {

+        op_arithK(L, l_subi, luai_numsub);

+        vmbreak;

+      }

+      vmcase(OP_MULK) {

+        op_arithK(L, l_muli, luai_nummul);

+        vmbreak;

+      }

+      vmcase(OP_MODK) {

+        op_arithK(L, luaV_mod, luaV_modf);

+        vmbreak;

+      }

+      vmcase(OP_POWK) {

+        op_arithfK(L, luai_numpow);

+        vmbreak;

+      }

+      vmcase(OP_DIVK) {

+        op_arithfK(L, luai_numdiv);

+        vmbreak;

+      }

+      vmcase(OP_IDIVK) {

+        op_arithK(L, luaV_idiv, luai_numidiv);

+        vmbreak;

+      }

+      vmcase(OP_BANDK) {

+        op_bitwiseK(L, l_band);

+        vmbreak;

+      }

+      vmcase(OP_BORK) {

+        op_bitwiseK(L, l_bor);

+        vmbreak;

+      }

+      vmcase(OP_BXORK) {

+        op_bitwiseK(L, l_bxor);

+        vmbreak;

+      }

+      vmcase(OP_SHRI) {

+        TValue *rb = vRB(i);

+        int ic = GETARG_sC(i);

+        lua_Integer ib;

+        if (tointegerns(rb, &ib)) {

+          pc++; setivalue(s2v(ra), luaV_shiftl(ib, -ic));

+        }

+        vmbreak;

+      }

+      vmcase(OP_SHLI) {

+        TValue *rb = vRB(i);

+        int ic = GETARG_sC(i);

+        lua_Integer ib;

+        if (tointegerns(rb, &ib)) {

+          pc++; setivalue(s2v(ra), luaV_shiftl(ic, ib));

+        }

+        vmbreak;

+      }

+      vmcase(OP_ADD) {

+        op_arith(L, l_addi, luai_numadd);

+        vmbreak;

+      }

+      vmcase(OP_SUB) {

+        op_arith(L, l_subi, luai_numsub);

+        vmbreak;

+      }

+      vmcase(OP_MUL) {

+        op_arith(L, l_muli, luai_nummul);

+        vmbreak;

+      }

+      vmcase(OP_MOD) {

+        op_arith(L, luaV_mod, luaV_modf);

+        vmbreak;

+      }

+      vmcase(OP_POW) {

+        op_arithf(L, luai_numpow);

+        vmbreak;

+      }

+      vmcase(OP_DIV) {  /* float division (always with floats) */

+        op_arithf(L, luai_numdiv);

+        vmbreak;

+      }

+      vmcase(OP_IDIV) {  /* floor division */

+        op_arith(L, luaV_idiv, luai_numidiv);

+        vmbreak;

+      }

+      vmcase(OP_BAND) {

+        op_bitwise(L, l_band);

+        vmbreak;

+      }

+      vmcase(OP_BOR) {

+        op_bitwise(L, l_bor);

+        vmbreak;

+      }

+      vmcase(OP_BXOR) {

+        op_bitwise(L, l_bxor);

+        vmbreak;

+      }

+      vmcase(OP_SHR) {

+        op_bitwise(L, luaV_shiftr);

+        vmbreak;

+      }

+      vmcase(OP_SHL) {

+        op_bitwise(L, luaV_shiftl);

+        vmbreak;

+      }

+      vmcase(OP_MMBIN) {

+        Instruction pi = *(pc - 2);  /* original arith. expression */

+        TValue *rb = vRB(i);

+        TMS tm = (TMS)GETARG_C(i);

+        StkId result = RA(pi);

+        lua_assert(OP_ADD <= GET_OPCODE(pi) && GET_OPCODE(pi) <= OP_SHR);

+        Protect(luaT_trybinTM(L, s2v(ra), rb, result, tm));

+        vmbreak;

+      }

+      vmcase(OP_MMBINI) {

+        Instruction pi = *(pc - 2);  /* original arith. expression */

+        int imm = GETARG_sB(i);

+        TMS tm = (TMS)GETARG_C(i);

+        int flip = GETARG_k(i);

+        StkId result = RA(pi);

+        Protect(luaT_trybiniTM(L, s2v(ra), imm, flip, result, tm));

+        vmbreak;

+      }

+      vmcase(OP_MMBINK) {

+        Instruction pi = *(pc - 2);  /* original arith. expression */

+        TValue *imm = KB(i);

+        TMS tm = (TMS)GETARG_C(i);

+        int flip = GETARG_k(i);

+        StkId result = RA(pi);

+        Protect(luaT_trybinassocTM(L, s2v(ra), imm, flip, result, tm));

+        vmbreak;

+      }

+      vmcase(OP_UNM) {

+        TValue *rb = vRB(i);

+        lua_Number nb;

+        if (ttisinteger(rb)) {

+          lua_Integer ib = ivalue(rb);

+          setivalue(s2v(ra), intop(-, 0, ib));

+        }

+        else if (tonumberns(rb, nb)) {

+          setfltvalue(s2v(ra), luai_numunm(L, nb));

+        }

+        else

+          Protect(luaT_trybinTM(L, rb, rb, ra, TM_UNM));

+        vmbreak;

+      }

+      vmcase(OP_BNOT) {

+        TValue *rb = vRB(i);

+        lua_Integer ib;

+        if (tointegerns(rb, &ib)) {

+          setivalue(s2v(ra), intop(^, ~l_castS2U(0), ib));

+        }

+        else

+          Protect(luaT_trybinTM(L, rb, rb, ra, TM_BNOT));

+        vmbreak;

+      }

+      vmcase(OP_NOT) {

+        TValue *rb = vRB(i);

+        if (l_isfalse(rb))

+          setbtvalue(s2v(ra));

+        else

+          setbfvalue(s2v(ra));

+        vmbreak;

+      }

+      vmcase(OP_LEN) {

+        Protect(luaV_objlen(L, ra, vRB(i)));

+        vmbreak;

+      }

+      vmcase(OP_CONCAT) {

+        int n = GETARG_B(i);  /* number of elements to concatenate */

+        L->top = ra + n;  /* mark the end of concat operands */

+        ProtectNT(luaV_concat(L, n));

+        checkGC(L, L->top); /* 'luaV_concat' ensures correct top */

+        vmbreak;

+      }

+      vmcase(OP_CLOSE) {

+        Protect(luaF_close(L, ra, LUA_OK));

+        vmbreak;

+      }

+      vmcase(OP_TBC) {

+        /* create new to-be-closed upvalue */

+        halfProtect(luaF_newtbcupval(L, ra));

+        vmbreak;

+      }

+      vmcase(OP_JMP) {

+        dojump(ci, i, 0);

+        vmbreak;

+      }

+      vmcase(OP_EQ) {

+        int cond;

+        TValue *rb = vRB(i);

+        Protect(cond = luaV_equalobj(L, s2v(ra), rb));

+        docondjump();

+        vmbreak;

+      }

+      vmcase(OP_LT) {

+        op_order(L, l_lti, LTnum, lessthanothers);

+        vmbreak;

+      }

+      vmcase(OP_LE) {

+        op_order(L, l_lei, LEnum, lessequalothers);

+        vmbreak;

+      }

+      vmcase(OP_EQK) {

+        TValue *rb = KB(i);

+        /* basic types do not use '__eq'; we can use raw equality */

+        int cond = luaV_rawequalobj(s2v(ra), rb);

+        docondjump();

+        vmbreak;

+      }

+      vmcase(OP_EQI) {

+        int cond;

+        int im = GETARG_sB(i);

+        if (ttisinteger(s2v(ra)))

+          cond = (ivalue(s2v(ra)) == im);

+        else if (ttisfloat(s2v(ra)))

+          cond = luai_numeq(fltvalue(s2v(ra)), cast_num(im));

+        else

+          cond = 0;  /* other types cannot be equal to a number */

+        docondjump();

+        vmbreak;

+      }

+      vmcase(OP_LTI) {

+        op_orderI(L, l_lti, luai_numlt, 0, TM_LT);

+        vmbreak;

+      }

+      vmcase(OP_LEI) {

+        op_orderI(L, l_lei, luai_numle, 0, TM_LE);

+        vmbreak;

+      }

+      vmcase(OP_GTI) {

+        op_orderI(L, l_gti, luai_numgt, 1, TM_LT);

+        vmbreak;

+      }

+      vmcase(OP_GEI) {

+        op_orderI(L, l_gei, luai_numge, 1, TM_LE);

+        vmbreak;

+      }

+      vmcase(OP_TEST) {

+        int cond = !l_isfalse(s2v(ra));

+        docondjump();

+        vmbreak;

+      }

+      vmcase(OP_TESTSET) {

+        TValue *rb = vRB(i);

+        if (l_isfalse(rb) == GETARG_k(i))

+          pc++;

+        else {

+          setobj2s(L, ra, rb);

+          donextjump(ci);

+        }

+        vmbreak;

+      }

+      vmcase(OP_CALL) {

+        CallInfo *newci;

+        int b = GETARG_B(i);

+        int nresults = GETARG_C(i) - 1;

+        if (b != 0)  /* fixed number of arguments? */

+          L->top = ra + b;  /* top signals number of arguments */

+        /* else previous instruction set top */

+        savepc(L);  /* in case of errors */

+        if ((newci = luaD_precall(L, ra, nresults)) == NULL)

+          updatetrap(ci);  /* C call; nothing else to be done */

+        else {  /* Lua call: run function in this same C frame */

+          ci = newci;

+          ci->callstatus = 0;  /* call re-uses 'luaV_execute' */

+          goto startfunc;

+        }

+        vmbreak;

+      }

+      vmcase(OP_TAILCALL) {

+        int b = GETARG_B(i);  /* number of arguments + 1 (function) */

+        int nparams1 = GETARG_C(i);

+        /* delta is virtual 'func' - real 'func' (vararg functions) */

+        int delta = (nparams1) ? ci->u.l.nextraargs + nparams1 : 0;

+        if (b != 0)

+          L->top = ra + b;

+        else  /* previous instruction set top */

+          b = cast_int(L->top - ra);

+        savepc(ci);  /* several calls here can raise errors */

+        if (TESTARG_k(i)) {

+          /* close upvalues from current call; the compiler ensures

+             that there are no to-be-closed variables here, so this

+             call cannot change the stack */

+          luaF_close(L, base, NOCLOSINGMETH);

+          lua_assert(base == ci->func + 1);

+        }

+        while (!ttisfunction(s2v(ra))) {  /* not a function? */

+          luaD_tryfuncTM(L, ra);  /* try '__call' metamethod */

+          b++;  /* there is now one extra argument */

+          checkstackGCp(L, 1, ra);

+        }

+        if (!ttisLclosure(s2v(ra))) {  /* C function? */

+          luaD_precall(L, ra, LUA_MULTRET);  /* call it */

+          updatetrap(ci);

+          updatestack(ci);  /* stack may have been relocated */

+          ci->func -= delta;  /* restore 'func' (if vararg) */

+          luaD_poscall(L, ci, cast_int(L->top - ra));  /* finish caller */

+          updatetrap(ci);  /* 'luaD_poscall' can change hooks */

+          goto ret;  /* caller returns after the tail call */

+        }

+        ci->func -= delta;  /* restore 'func' (if vararg) */

+        luaD_pretailcall(L, ci, ra, b);  /* prepare call frame */

+        goto startfunc;  /* execute the callee */

+      }

+      vmcase(OP_RETURN) {

+        int n = GETARG_B(i) - 1;  /* number of results */

+        int nparams1 = GETARG_C(i);

+        if (n < 0)  /* not fixed? */

+          n = cast_int(L->top - ra);  /* get what is available */

+        savepc(ci);

+        if (TESTARG_k(i)) {  /* may there be open upvalues? */

+          if (L->top < ci->top)

+            L->top = ci->top;

+          luaF_close(L, base, LUA_OK);

+          updatetrap(ci);

+          updatestack(ci);

+        }

+        if (nparams1)  /* vararg function? */

+          ci->func -= ci->u.l.nextraargs + nparams1;

+        L->top = ra + n;  /* set call for 'luaD_poscall' */

+        luaD_poscall(L, ci, n);

+        updatetrap(ci);  /* 'luaD_poscall' can change hooks */

+        goto ret;

+      }

+      vmcase(OP_RETURN0) {

+        if (L->hookmask) {

+          L->top = ra;

+          savepc(ci);

+          luaD_poscall(L, ci, 0);  /* no hurry... */

+          trap = 1;

+        }

+        else {  /* do the 'poscall' here */

+          int nres = ci->nresults;

+          L->ci = ci->previous;  /* back to caller */

+          L->top = base - 1;

+          while (nres-- > 0)

+            setnilvalue(s2v(L->top++));  /* all results are nil */

+        }

+        goto ret;

+      }

+      vmcase(OP_RETURN1) {

+        if (L->hookmask) {

+          L->top = ra + 1;

+          savepc(ci);

+          luaD_poscall(L, ci, 1);  /* no hurry... */

+          trap = 1;

+        }

+        else {  /* do the 'poscall' here */

+          int nres = ci->nresults;

+          L->ci = ci->previous;  /* back to caller */

+          if (nres == 0)

+            L->top = base - 1;  /* asked for no results */

+          else {

+            setobjs2s(L, base - 1, ra);  /* at least this result */

+            L->top = base;

+            while (--nres > 0)  /* complete missing results */

+              setnilvalue(s2v(L->top++));

+          }

+        }

+       ret:  /* return from a Lua function */

+        if (ci->callstatus & CIST_FRESH)

+          return;  /* end this frame */

+        else {

+          ci = ci->previous;

+          goto returning;  /* continue running caller in this frame */

+        }

+      }

+      vmcase(OP_FORLOOP) {

+        if (ttisinteger(s2v(ra + 2))) {  /* integer loop? */

+          lua_Unsigned count = l_castS2U(ivalue(s2v(ra + 1)));

+          if (count > 0) {  /* still more iterations? */

+            lua_Integer step = ivalue(s2v(ra + 2));

+            lua_Integer idx = ivalue(s2v(ra));  /* internal index */

+            chgivalue(s2v(ra + 1), count - 1);  /* update counter */

+            idx = intop(+, idx, step);  /* add step to index */

+            chgivalue(s2v(ra), idx);  /* update internal index */

+            setivalue(s2v(ra + 3), idx);  /* and control variable */

+            pc -= GETARG_Bx(i);  /* jump back */

+          }

+        }

+        else if (floatforloop(ra))  /* float loop */

+          pc -= GETARG_Bx(i);  /* jump back */

+        updatetrap(ci);  /* allows a signal to break the loop */

+        vmbreak;

+      }

+      vmcase(OP_FORPREP) {

+        savestate(L, ci);  /* in case of errors */

+        if (forprep(L, ra))

+          pc += GETARG_Bx(i) + 1;  /* skip the loop */

+        vmbreak;

+      }

+      vmcase(OP_TFORPREP) {

+        /* create to-be-closed upvalue (if needed) */

+        halfProtect(luaF_newtbcupval(L, ra + 3));

+        pc += GETARG_Bx(i);

+        i = *(pc++);  /* go to next instruction */

+        lua_assert(GET_OPCODE(i) == OP_TFORCALL && ra == RA(i));

+        goto l_tforcall;

+      }

+      vmcase(OP_TFORCALL) {

+       l_tforcall:

+        /* 'ra' has the iterator function, 'ra + 1' has the state,

+           'ra + 2' has the control variable, and 'ra + 3' has the

+           to-be-closed variable. The call will use the stack after

+           these values (starting at 'ra + 4')

+        */

+        /* push function, state, and control variable */

+        memcpy(ra + 4, ra, 3 * sizeof(*ra));

+        L->top = ra + 4 + 3;

+        ProtectNT(luaD_call(L, ra + 4, GETARG_C(i)));  /* do the call */

+        updatestack(ci);  /* stack may have changed */

+        i = *(pc++);  /* go to next instruction */

+        lua_assert(GET_OPCODE(i) == OP_TFORLOOP && ra == RA(i));

+        goto l_tforloop;

+      }

+      vmcase(OP_TFORLOOP) {

+        l_tforloop:

+        if (!ttisnil(s2v(ra + 4))) {  /* continue loop? */

+          setobjs2s(L, ra + 2, ra + 4);  /* save control variable */

+          pc -= GETARG_Bx(i);  /* jump back */

+        }

+        vmbreak;

+      }

+      vmcase(OP_SETLIST) {

+        int n = GETARG_B(i);

+        unsigned int last = GETARG_C(i);

+        Table *h = hvalue(s2v(ra));

+        if (n == 0)

+          n = cast_int(L->top - ra) - 1;  /* get up to the top */

+        else

+          L->top = ci->top;  /* correct top in case of emergency GC */

+        last += n;

+        if (TESTARG_k(i)) {

+          last += GETARG_Ax(*pc) * (MAXARG_C + 1);

+          pc++;

+        }

+        if (last > luaH_realasize(h))  /* needs more space? */

+          luaH_resizearray(L, h, last);  /* preallocate it at once */

+        for (; n > 0; n--) {

+          TValue *val = s2v(ra + n);

+          setobj2t(L, &h->array[last - 1], val);

+          last--;

+          luaC_barrierback(L, obj2gco(h), val);

+        }

+        vmbreak;

+      }

+      vmcase(OP_CLOSURE) {

+        Proto *p = cl->p->p[GETARG_Bx(i)];

+        halfProtect(pushclosure(L, p, cl->upvals, base, ra));

+        checkGC(L, ra + 1);

+        vmbreak;

+      }

+      vmcase(OP_VARARG) {

+        int n = GETARG_C(i) - 1;  /* required results */

+        Protect(luaT_getvarargs(L, ci, ra, n));

+        vmbreak;

+      }

+      vmcase(OP_VARARGPREP) {

+        ProtectNT(luaT_adjustvarargs(L, GETARG_A(i), ci, cl->p));

+        if (trap) {

+          luaD_hookcall(L, ci);

+          L->oldpc = 1;  /* next opcode will be seen as a "new" line */

+        }

+        updatebase(ci);  /* function has new base after adjustment */

+        vmbreak;

+      }

+      vmcase(OP_EXTRAARG) {

+        lua_assert(0);

+        vmbreak;

+      }

+    }

+  }

+}

+

+/* }================================================================== */

--- /dev/null

+++ b/lvm.h

@@ -1,0 +1,134 @@

+/*

+** $Id: lvm.h $

+** Lua virtual machine

+** See Copyright Notice in lua.h

+*/

+

+#ifndef lvm_h

+#define lvm_h

+

+

+#include "ldo.h"

+#include "lobject.h"

+#include "ltm.h"

+

+

+#if !defined(LUA_NOCVTN2S)

+#define cvt2str(o)	ttisnumber(o)

+#else

+#define cvt2str(o)	0	/* no conversion from numbers to strings */

+#endif

+

+

+#if !defined(LUA_NOCVTS2N)

+#define cvt2num(o)	ttisstring(o)

+#else

+#define cvt2num(o)	0	/* no conversion from strings to numbers */

+#endif

+

+

+/*

+** You can define LUA_FLOORN2I if you want to convert floats to integers

+** by flooring them (instead of raising an error if they are not

+** integral values)

+*/

+#if !defined(LUA_FLOORN2I)

+#define LUA_FLOORN2I		F2Ieq

+#endif

+

+

+/*

+** Rounding modes for float->integer coercion

+ */

+typedef enum {

+  F2Ieq,     /* no rounding; accepts only integral values */

+  F2Ifloor,  /* takes the floor of the number */

+  F2Iceil    /* takes the ceil of the number */

+} F2Imod;

+

+

+/* convert an object to a float (including string coercion) */

+#define tonumber(o,n) \

+	(ttisfloat(o) ? (*(n) = fltvalue(o), 1) : luaV_tonumber_(o,n))

+

+

+/* convert an object to a float (without string coercion) */

+#define tonumberns(o,n) \

+	(ttisfloat(o) ? ((n) = fltvalue(o), 1) : \

+	(ttisinteger(o) ? ((n) = cast_num(ivalue(o)), 1) : 0))

+

+

+/* convert an object to an integer (including string coercion) */

+#define tointeger(o,i) \

+  (ttisinteger(o) ? (*(i) = ivalue(o), 1) : luaV_tointeger(o,i,LUA_FLOORN2I))

+

+

+/* convert an object to an integer (without string coercion) */

+#define tointegerns(o,i) \

+  (ttisinteger(o) ? (*(i) = ivalue(o), 1) : luaV_tointegerns(o,i,LUA_FLOORN2I))

+

+

+#define intop(op,v1,v2) l_castU2S(l_castS2U(v1) op l_castS2U(v2))

+

+#define luaV_rawequalobj(t1,t2)		luaV_equalobj(NULL,t1,t2)

+

+

+/*

+** fast track for 'gettable': if 't' is a table and 't[k]' is present,

+** return 1 with 'slot' pointing to 't[k]' (position of final result).

+** Otherwise, return 0 (meaning it will have to check metamethod)

+** with 'slot' pointing to an empty 't[k]' (if 't' is a table) or NULL

+** (otherwise). 'f' is the raw get function to use.

+*/

+#define luaV_fastget(L,t,k,slot,f) \

+  (!ttistable(t)  \

+   ? (slot = NULL, 0)  /* not a table; 'slot' is NULL and result is 0 */  \

+   : (slot = f(hvalue(t), k),  /* else, do raw access */  \

+      !isempty(slot)))  /* result not empty? */

+

+

+/*

+** Special case of 'luaV_fastget' for integers, inlining the fast case

+** of 'luaH_getint'.

+*/

+#define luaV_fastgeti(L,t,k,slot) \

+  (!ttistable(t)  \

+   ? (slot = NULL, 0)  /* not a table; 'slot' is NULL and result is 0 */  \

+   : (slot = (l_castS2U(k) - 1u < hvalue(t)->alimit) \

+              ? &hvalue(t)->array[k - 1] : luaH_getint(hvalue(t), k), \

+      !isempty(slot)))  /* result not empty? */

+

+

+/*

+** Finish a fast set operation (when fast get succeeds). In that case,

+** 'slot' points to the place to put the value.

+*/

+#define luaV_finishfastset(L,t,slot,v) \

+    { setobj2t(L, cast(TValue *,slot), v); \

+      luaC_barrierback(L, gcvalue(t), v); }

+

+

+

+

+LUAI_FUNC int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2);

+LUAI_FUNC int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r);

+LUAI_FUNC int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r);

+LUAI_FUNC int luaV_tonumber_ (const TValue *obj, lua_Number *n);

+LUAI_FUNC int luaV_tointeger (const TValue *obj, lua_Integer *p, F2Imod mode);

+LUAI_FUNC int luaV_tointegerns (const TValue *obj, lua_Integer *p,

+                                F2Imod mode);

+LUAI_FUNC int luaV_flttointeger (lua_Number n, lua_Integer *p, F2Imod mode);

+LUAI_FUNC void luaV_finishget (lua_State *L, const TValue *t, TValue *key,

+                               StkId val, const TValue *slot);

+LUAI_FUNC void luaV_finishset (lua_State *L, const TValue *t, TValue *key,

+                               TValue *val, const TValue *slot);

+LUAI_FUNC void luaV_finishOp (lua_State *L);

+LUAI_FUNC void luaV_execute (lua_State *L, CallInfo *ci);

+LUAI_FUNC void luaV_concat (lua_State *L, int total);

+LUAI_FUNC lua_Integer luaV_idiv (lua_State *L, lua_Integer x, lua_Integer y);

+LUAI_FUNC lua_Integer luaV_mod (lua_State *L, lua_Integer x, lua_Integer y);

+LUAI_FUNC lua_Number luaV_modf (lua_State *L, lua_Number x, lua_Number y);

+LUAI_FUNC lua_Integer luaV_shiftl (lua_Integer x, lua_Integer y);

+LUAI_FUNC void luaV_objlen (lua_State *L, StkId ra, const TValue *rb);

+

+#endif

--- /dev/null

+++ b/lzio.c

@@ -1,0 +1,68 @@

+/*

+** $Id: lzio.c $

+** Buffered streams

+** See Copyright Notice in lua.h

+*/

+

+#define lzio_c

+#define LUA_CORE

+

+#include "lprefix.h"

+

+

+#include <string.h>

+

+#include "lua.h"

+

+#include "llimits.h"

+#include "lmem.h"

+#include "lstate.h"

+#include "lzio.h"

+

+

+int luaZ_fill (ZIO *z) {

+  size_t size;

+  lua_State *L = z->L;

+  const char *buff;

+  lua_unlock(L);

+  buff = z->reader(L, z->data, &size);

+  lua_lock(L);

+  if (buff == NULL || size == 0)

+    return EOZ;

+  z->n = size - 1;  /* discount char being returned */

+  z->p = buff;

+  return cast_uchar(*(z->p++));

+}

+

+

+void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data) {

+  z->L = L;

+  z->reader = reader;

+  z->data = data;

+  z->n = 0;

+  z->p = NULL;

+}

+

+

+/* --------------------------------------------------------------- read --- */

+size_t luaZ_read (ZIO *z, void *b, size_t n) {

+  while (n) {

+    size_t m;

+    if (z->n == 0) {  /* no bytes in buffer? */

+      if (luaZ_fill(z) == EOZ)  /* try to read more */

+        return n;  /* no more input; return number of missing bytes */

+      else {

+        z->n++;  /* luaZ_fill consumed first byte; put it back */

+        z->p--;

+      }

+    }

+    m = (n <= z->n) ? n : z->n;  /* min. between n and z->n */

+    memcpy(b, z->p, m);

+    z->n -= m;

+    z->p += m;

+    b = (char *)b + m;

+    n -= m;

+  }

+  return 0;

+}

+

--- /dev/null

+++ b/lzio.h

@@ -1,0 +1,66 @@

+/*

+** $Id: lzio.h $

+** Buffered streams

+** See Copyright Notice in lua.h

+*/

+

+

+#ifndef lzio_h

+#define lzio_h

+

+#include "lua.h"

+

+#include "lmem.h"

+

+

+#define EOZ	(-1)			/* end of stream */

+

+typedef struct Zio ZIO;

+

+#define zgetc(z)  (((z)->n--)>0 ?  cast_uchar(*(z)->p++) : luaZ_fill(z))

+

+

+typedef struct Mbuffer {

+  char *buffer;

+  size_t n;

+  size_t buffsize;

+} Mbuffer;

+

+#define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)

+

+#define luaZ_buffer(buff)	((buff)->buffer)

+#define luaZ_sizebuffer(buff)	((buff)->buffsize)

+#define luaZ_bufflen(buff)	((buff)->n)

+

+#define luaZ_buffremove(buff,i)	((buff)->n -= (i))

+#define luaZ_resetbuffer(buff) ((buff)->n = 0)

+

+

+#define luaZ_resizebuffer(L, buff, size) \

+	((buff)->buffer = luaM_reallocvchar(L, (buff)->buffer, \

+				(buff)->buffsize, size), \

+	(buff)->buffsize = size)

+

+#define luaZ_freebuffer(L, buff)	luaZ_resizebuffer(L, buff, 0)

+

+

+LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,

+                                        void *data);

+LUAI_FUNC size_t luaZ_read (ZIO* z, void *b, size_t n);	/* read next n bytes */

+

+

+

+/* --------- Private Part ------------------ */

+

+struct Zio {

+  size_t n;			/* bytes still unread */

+  const char *p;		/* current position in buffer */

+  lua_Reader reader;		/* reader function */

+  void *data;			/* additional data */

+  lua_State *L;			/* Lua state (for reader) */

+};

+

+

+LUAI_FUNC int luaZ_fill (ZIO *z);

+

+#endif