ref: 43316bbc84903bb97857748cad3125e20cdf0955
dir: /src/cmd/cc/cc1/cpp.c/
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <scc/cstd.h>
#include <scc/scc.h>
#include "cc1.h"
static char *argp, *macroname;
static unsigned arglen;
static unsigned ncmdlines;
static Symbol *symline, *symfile;
static unsigned char ifstatus[NR_COND];
static int cppoff;
static struct items dirinclude;
unsigned cppctx;
int disexpand;
void
defdefine(char *macro, char *val, char *source)
{
char *def, *fmt = "#define %s %s\n";
Symbol dummy = {.flags = SDECLARED};
if (!val)
val = "";
def = xmalloc(strlen(fmt) + strlen(macro) + strlen(val));
sprintf(def, fmt, macro, val);
lineno = ++ncmdlines;
addinput(source, &dummy, def);
cpp();
delinput();
}
void
undefmacro(char *s)
{
killsym(lookup(NS_CPP, s, NOALLOC));
}
void
icpp(void)
{
static char sdate[14], stime[11];
struct tm *tm;
time_t t;
static char **bp, *list[] = {
"__STDC__",
"__STDC_HOSTED__",
"__SCC__",
NULL
};
static struct keyword keys[] = {
{"define", DEFINE, DEFINE},
{"include", INCLUDE, INCLUDE},
{"line", LINE, LINE},
{"ifdef", IFDEF, IFDEF},
{"if", IF, IF},
{"elif", ELIF, ELIF},
{"else", ELSE, ELSE},
{"ifndef", IFNDEF, IFNDEF},
{"endif", ENDIF, ENDIF},
{"undef", UNDEF, UNDEF},
{"pragma", PRAGMA, PRAGMA},
{"error", ERROR, ERROR},
{NULL, 0, 0}
};
keywords(keys, NS_CPPCLAUSES);
t = time(NULL);
tm = localtime(&t);
strftime(sdate, sizeof(sdate), "\"%b %d %Y\"", tm);
strftime(stime, sizeof(stime), "\"%H:%M:%S\"", tm);
defdefine("__DATE__", sdate, "built-in");
defdefine("__TIME__", stime, "built-in");
defdefine("__STDC_VERSION__", STDC_VERSION, "built-in");
defdefine("__LINE__", NULL, "built-in");
defdefine("__FILE__", NULL, "built-in");
symline = lookup(NS_CPP, "__LINE__", ALLOC);
symfile = lookup(NS_CPP, "__FILE__", ALLOC);
for (bp = list; *bp; ++bp)
defdefine(*bp, "1", "built-in");
ncmdlines = 0;
}
static void
nextcpp(void)
{
next();
if (yytoken == EOFTOK)
error("unterminated argument list invoking macro \"%s\"",
macroname);
if (yylen + 1 > arglen)
error("argument overflow invoking macro \"%s\"",
macroname);
if (yytoken == IDEN)
yylval.sym->flags |= SUSED;
memcpy(argp, yytext, yylen);
argp += yylen;
*argp++ = ' ';
arglen -= yylen + 1;
}
static void
paren(void)
{
for (;;) {
nextcpp();
switch (yytoken) {
case ')':
return;
case '(':
paren();
break;
}
}
}
static void
parameter(void)
{
for (;;) {
nextcpp();
switch (yytoken) {
case ')':
case ',':
argp -= 3; /* remove " , " or " ) "*/
*argp++ = '\0';
return;
case '(':
paren();
break;
}
}
}
static int
parsepars(char *buffer, char **listp, int nargs)
{
int n;
if (nargs == -1)
return -1;
if (ahead() != '(' && nargs > 0)
return 0;
disexpand = 1;
next();
n = 0;
argp = buffer;
arglen = INPUTSIZ;
if (ahead() == ')') {
next();
} else {
do {
*listp++ = argp;
parameter();
} while (++n < NR_MACROARG && yytoken == ',');
}
if (yytoken != ')')
error("incorrect macro function-alike invocation");
disexpand = 0;
if (n == NR_MACROARG)
error("too many parameters in macro \"%s\"", macroname);
if (n != nargs) {
error("macro \"%s\" received %d arguments, but it takes %d",
macroname, n, nargs);
}
return 1;
}
static size_t
copymacro(char *buffer, char *s, size_t bufsiz, char *arglist[])
{
int delim, prevc, c;
char *p, *arg, *bp = buffer;
size_t size;
for (prevc = '\0'; c = *s; prevc = c, ++s) {
switch (c) {
case '$':
while (bp[-1] == ' ')
--bp, ++bufsiz;
while (s[1] == ' ')
++s;
case '#':
break;
case '\'':
delim = '\'';
goto search_delim;
case '\"':
delim = '"';
search_delim:
for (p = s; *++s != delim; )
;
size = s - p + 1;
if (size > bufsiz)
goto expansion_too_long;
memcpy(bp, p, size);
bufsiz -= size;
bp += size;
break;
case '@':
if (prevc == '#')
bufsiz -= 2;
arg = arglist[atoi(++s)];
size = strlen(arg);
if (size > bufsiz)
goto expansion_too_long;
if (prevc == '#')
*bp++ = '"';
memcpy(bp, arg, size);
bp += size;
if (prevc == '#')
*bp++ = '"';
bufsiz -= size;
s += 2;
break;
default:
if (bufsiz-- == 0)
goto expansion_too_long;
*bp++ = c;
break;
}
}
*bp = '\0';
return bp - buffer;
expansion_too_long:
error("macro expansion of \"%s\" too long", macroname);
}
int
expand(char *begin, Symbol *sym)
{
size_t elen;
int n, i;
char *s = sym->u.s;
char *arglist[NR_MACROARG], arguments[INPUTSIZ], buffer[INPUTSIZ];
macroname = sym->name;
if (sym == symfile) {
elen = sprintf(buffer, "\"%s\" ", filenam);
goto substitute;
}
if (sym == symline) {
elen = sprintf(buffer, "%d ", lineno);
goto substitute;
}
if (!s)
return 1;
n = atoi(s);
if (!parsepars(arguments, arglist, n))
return 0;
for (i = 0; i < n; ++i)
DBG("MACRO par%d:%s", i, arglist[i]);
elen = copymacro(buffer, s+3, INPUTSIZ-1, arglist);
substitute:
DBG("MACRO '%s' expanded to :'%s'", macroname, buffer);
buffer[elen] = '\0';
addinput(filenam, sym, xstrdup(buffer));
return 1;
}
static int
getpars(Symbol *args[NR_MACROARG])
{
int n, c;
Symbol *sym;
c = *input->p;
next();
if (c != '(')
return -1;
next(); /* skip the '(' */
if (accept(')'))
return 0;
n = 0;
do {
if (n == NR_MACROARG) {
cpperror("too many parameters in macro");
return NR_MACROARG;
}
if (accept(ELLIPSIS)) {
args[n++] = NULL;
break;
}
if (yytoken != IDEN) {
cpperror("macro arguments must be identifiers");
return NR_MACROARG;
}
sym = install(NS_IDEN, yylval.sym);
sym->flags |= SUSED;
args[n++] = sym;
next();
} while (accept(','));
expect(')');
return n;
}
static int
getdefs(Symbol *args[NR_MACROARG], int nargs, char *bp, size_t bufsiz)
{
Symbol **argp;
size_t len;
int prevc = 0, ispar;
if (yytoken == '$') {
cpperror("'##' cannot appear at either ends of a macro expansion");
return 0;
}
for (;;) {
ispar = 0;
if (yytoken == IDEN && nargs >= 0) {
for (argp = args; argp < &args[nargs]; ++argp) {
if (*argp == yylval.sym)
break;
}
if (argp != &args[nargs]) {
sprintf(yytext, "@%02d@", (int) (argp - args));
ispar = 1;
}
}
if (prevc == '#' && !ispar) {
cpperror("'#' is not followed by a macro parameter");
return 0;
}
if (yytoken == '\n')
break;
if ((len = strlen(yytext)) >= bufsiz) {
cpperror("macro too long");
return 0;
}
if (yytoken == '$') {
*bp++ = '$';
--bufsiz;
} else {
memcpy(bp, yytext, len);
bp += len;
bufsiz -= len;
}
if ((prevc = yytoken) != '#') {
*bp++ = ' ';
--bufsiz;
}
next();
}
*bp = '\0';
return 1;
}
static void
define(void)
{
Symbol *sym,*args[NR_MACROARG];
char buff[LINESIZ+1];
int n;
if (cppoff)
return;
namespace = NS_CPP;
next();
if (yytoken != IDEN) {
cpperror("macro names must be identifiers");
return;
}
sym = yylval.sym;
if (sym->flags & SDECLARED) {
warn("'%s' redefined", yytext);
free(sym->u.s);
} else {
sym = install(NS_CPP, sym);
sym->flags |= SDECLARED|SSTRING;
}
namespace = NS_IDEN; /* Avoid polution in NS_CPP */
if ((n = getpars(args)) == NR_MACROARG)
goto delete;
if (n > 0 && !args[n-1]) /* it is a variadic function */
--n;
sprintf(buff, "%02d#", n);
if (!getdefs(args, n, buff+3, LINESIZ-3))
goto delete;
sym->u.s = xstrdup(buff);
DBG("MACRO '%s' defined as '%s'", sym->name, buff);
return;
delete:
killsym(sym);
}
void
incdir(char *dir)
{
if (!dir || *dir == '\0')
die("cc1: incorrect -I flag");
newitem(&dirinclude, dir);
}
static int
includefile(char *dir, char *file, size_t filelen)
{
size_t dirlen;
char path[FILENAME_MAX];
if (!dir) {
dirlen = 0;
if (filelen > FILENAME_MAX-1)
return 0;
} else {
dirlen = strlen(dir);
if (dirlen + filelen > FILENAME_MAX-2)
return 0;
memcpy(path, dir, dirlen);
if (dir[dirlen-1] != '/')
path[dirlen++] = '/';
}
memcpy(path+dirlen, file, filelen);
path[dirlen + filelen] = '\0';
addinput(path, NULL, NULL);
return 1;
}
static char *
cwd(char *buf)
{
char *p, *s = filenam;
size_t len;
if ((p = strrchr(s, '/')) == NULL)
return NULL;
if ((len = p - s) >= FILENAME_MAX)
die("cc1: current work directory too long");
memcpy(buf, s, len);
buf[len] = '\0';
return buf;
}
static void
include(void)
{
char dir[FILENAME_MAX], file[FILENAME_MAX], *p, **bp;
size_t filelen;
int n;
if (cppoff)
return;
namespace = NS_IDEN;
next();
switch (*yytext) {
case '<':
if ((p = strchr(input->begin, '>')) == NULL || p[-1] == '<')
goto bad_include;
filelen = p - input->begin;
if (filelen >= FILENAME_MAX)
goto too_long;
memcpy(file, input->begin, filelen);
file[filelen] = '\0';
input->begin = input->p = p+1;
if (next() != '\n')
goto trailing_characters;
break;
case '"':
if (yylen < 3)
goto bad_include;
filelen = yylen-2;
if (filelen >= FILENAME_MAX)
goto too_long;
memcpy(file, yytext+1, filelen);
file[filelen] = '\0';
if (next() != '\n')
goto trailing_characters;
if (includefile(cwd(dir), file, filelen))
goto its_done;
break;
default:
goto bad_include;
}
n = dirinclude.n;
for (bp = dirinclude.s; n--; ++bp) {
if (includefile(*bp, file, filelen))
goto its_done;
}
cpperror("included file '%s' not found", file);
its_done:
return;
trailing_characters:
cpperror("trailing characters after preprocessor directive");
return;
too_long:
cpperror("too long file name in #include");
return;
bad_include:
cpperror("#include expects \"FILENAME\" or <FILENAME>");
return;
}
static void
line(void)
{
long n;
char *endp, *fname;
if (cppoff)
return;
disexpand = 0;
next();
n = strtol(yytext, &endp, 10);
if (n <= 0 || n > USHRT_MAX || *endp != '\0') {
cpperror("first parameter of #line is not a positive integer");
return;
}
next();
if (yytoken == '\n') {
fname = NULL;
} else {
if (*yytext != '\"' || yylen == 1) {
cpperror("second parameter of #line is not a valid filename");
return;
}
fname = yylval.sym->u.s;
}
setloc(fname, n - 1);
if (yytoken != '\n')
next();
}
static void
pragma(void)
{
if (cppoff)
return;
next();
warn("ignoring pragma '%s'", yytext);
*input->p = '\0';
next();
}
static void
usererr(void)
{
if (cppoff)
return;
cpperror("#error %s", input->p);
*input->p = '\0';
next();
}
static void
ifclause(int negate, int isifdef)
{
Symbol *sym;
unsigned n;
int status;
Node *expr;
if (cppctx == NR_COND-1)
error("too many nesting levels of conditional inclusion");
n = cppctx++;
namespace = NS_CPP;
next();
if (isifdef) {
if (yytoken != IDEN) {
cpperror("no macro name given in #%s directive",
(negate) ? "ifndef" : "ifdef");
return;
}
sym = yylval.sym;
next();
status = (sym->flags & SDECLARED) != 0;
if (!status)
killsym(sym);
} else {
/* TODO: catch recovery here */
if ((expr = constexpr()) == NULL) {
cpperror("parameter of #if is not an integer constant expression");
return;
}
status = expr->sym->u.i != 0;
freetree(expr);
}
if (negate)
status = !status;
if ((ifstatus[n] = status) == 0)
++cppoff;
}
static void
cppif(void)
{
disexpand = 0;
ifclause(0, 0);
}
static void
ifdef(void)
{
ifclause(0, 1);
}
static void
ifndef(void)
{
ifclause(1, 1);
}
static void
elseclause(void)
{
int status;
if (cppctx == 0) {
cpperror("#else without #ifdef/ifndef");
return;
}
status = ifstatus[cppctx-1];
ifstatus[cppctx-1] = !status;
cppoff += (status) ? 1 : -1;
}
static void
cppelse(void)
{
elseclause();
next();
}
static void
elif(void)
{
elseclause();
if (ifstatus[cppctx-1]) {
--cppctx;
cppif();
}
}
static void
endif(void)
{
if (cppctx == 0)
error("#endif without #if");
if (!ifstatus[--cppctx])
--cppoff;
next();
}
static void
undef(void)
{
if (cppoff)
return;
namespace = NS_CPP;
next();
if (yytoken != IDEN) {
error("no macro name given in #undef directive");
return;
}
killsym(yylval.sym);
next();
}
int
cpp(void)
{
static struct {
unsigned char token;
void (*fun)(void);
} *bp, clauses [] = {
{DEFINE, define},
{INCLUDE, include},
{LINE, line},
{IFDEF, ifdef},
{IF, cppif},
{ELIF, elif},
{IFNDEF, ifndef},
{ELSE, cppelse},
{ENDIF, endif},
{UNDEF, undef},
{PRAGMA, pragma},
{ERROR, usererr},
{0, NULL}
};
int ns;
char *p;
for (p = input->p; isspace(*p); ++p)
;
if (*p != '#')
return cppoff;
input->p = p+1;
disexpand = 1;
lexmode = CPPMODE;
ns = namespace;
namespace = NS_CPPCLAUSES;
next();
namespace = NS_IDEN;
for (bp = clauses; bp->token && bp->token != yytoken; ++bp)
;
if (!bp->token) {
errorp("incorrect preprocessor directive '%s'", yytext);
goto error;
}
DBG("CPP %s", yytext);
pushctx(); /* create a new context to avoid polish */
(*bp->fun)(); /* the current context, and to get all */
popctx(); /* the symbols freed at the end */
/*
* #include changes the content of input->line, so the correctness
* of the line must be checked in the own include(), and we have
* to skip this tests. For the same reason include() is the only
* function which does not prepare the next token
*/
if (yytoken != '\n' && !cppoff && bp->token != INCLUDE)
errorp("trailing characters after preprocessor directive");
error:
disexpand = 0;
lexmode = CCMODE;
namespace = ns;
return 1;
}
void
ppragmaln(void)
{
static char file[FILENAME_MAX];
static unsigned nline;
char *s;
putchar('\n');
if (strcmp(file, filenam)) {
strcpy(file, filenam);
s = "#line %u \"%s\"\n";
} else if (nline+1 != lineno) {
s = "#line %u\n";
} else {
s = "";
}
nline = lineno;
printf(s, nline, file);
}
void
outcpp(void)
{
int c;
char *s, *t;
for (next(); yytoken != EOFTOK; next()) {
if (onlyheader)
continue;
if (yytoken != STRING) {
printf("%s ", yytext);
continue;
}
for (s = yytext; c = *s; ++s) {
switch (c) {
case '\n':
t = "\\n";
goto print_str;
case '\v':
t = "\\v";
goto print_str;
case '\b':
t = "\\b";
goto print_str;
case '\t':
t = "\\t";
goto print_str;
case '\a':
t = "\\a";
print_str:
fputs(t, stdout);
break;
case '\\':
putchar('\\');
default:
if (!isprint(c))
printf("\\x%x", c);
else
putchar(c);
break;
}
}
putchar(' ');
}
putchar('\n');
}