shithub: mc

--- a/6/isel.c

+++ b/6/isel.c

@@ -719,6 +719,7 @@

         case Oslice: case Oidx: case Osize: case Numops:

         case Oucon: case Ouget: case Otup: case Oarr: case Ostruct:

         case Oslbase: case Osllen: case Ocast:

+        case Obreak: case Ocontinue:

             dump(n, stdout);

             die("Should not see %s in isel", opstr(exprop(n)));

             break;

--- a/6/simp.c

+++ b/6/simp.c

@@ -37,6 +37,12 @@

     /* pre/postinc handling */

     Node **incqueue;

     size_t nqueue;

+    /* break/continue handling */

+    Node **loopstep;

+    size_t nloopstep;

+    Node **loopexit;

+    size_t nloopexit;

     /* location handling */

     Node **blobs;

@@ -469,19 +475,28 @@

     Node *lbody;

     Node *lend;

     Node *lcond;

+    Node *lstep;

     lbody = genlbl();

     lcond = genlbl();

+    lstep = genlbl();

     lend = genlbl();

+    lappend(&s->loopstep, &s->nloopstep, lstep);

+    lappend(&s->loopexit, &s->nloopexit, lend);

     simp(s, n->loopstmt.init);  /* init */

     jmp(s, lcond);              /* goto test */

     simp(s, lbody);             /* body lbl */

     simp(s, n->loopstmt.body);  /* body */

+    simp(s, lstep);             /* test lbl */

     simp(s, n->loopstmt.step);  /* step */

     simp(s, lcond);             /* test lbl */

     simpcond(s, n->loopstmt.cond, lbody, lend);    /* repeat? */

     simp(s, lend);              /* exit */

+    s->nloopstep--;

+    s->nloopexit--;

 /* pat; seq;

@@ -514,6 +529,9 @@

     lmatch = genlbl();

     lend = genlbl();

+    lappend(&s->loopstep, &s->nloopstep, lstep);

+    lappend(&s->loopexit, &s->nloopexit, lend);

     zero = mkintlit(n->line, 0);

     zero->expr.type = tyintptr;

@@ -539,6 +557,9 @@

     val = load(idxaddr(s, seq, idx));

     umatch(s, n->iterstmt.elt, val, val->expr.type, lbody, lstep);

     simp(s, lend);

+    s->nloopstep--;

+    s->nloopexit--;

 static Ucon *finducon(Node *n)

@@ -1230,7 +1251,6 @@

     r = NULL;

     args = n->expr.args;

     switch (exprop(n)) {

-        case Obad:

         case Olor: case Oland:

             r = simplazy(s, n);

             break;

@@ -1402,6 +1422,17 @@

                 r = visit(s, n);

             break;

+        case Obreak:

+            if (s->nloopexit == 0)

+                fatal(n->line, "trying to break when not in loop");

+            jmp(s, s->loopexit[s->nloopexit - 1]);

+            break;

+        case Ocontinue:

+            if (s->nloopstep == 0)

+                fatal(n->line, "trying to continue when not in loop");

+            jmp(s, s->loopstep[s->nloopstep - 1]);

+            break;

+            break;

         default:

             if (istyfloat(exprtype(n))) {

                 switch (exprop(n)) {

@@ -1413,6 +1444,10 @@

             r = visit(s, n);

+            break;

+        case Obad:

+            die("Bad operator");

+            break;

     return r;

--- a/libstd/sys-linux.myr

+++ b/libstd/sys-linux.myr

@@ -2,6 +2,7 @@

 use "sleq.use"

 pkg std =

+	type pid	= int64

 	type scno	= int64	/* syscall */

 	type fdopt	= int64	/* fd options */

 	type fd		= int64	/* fd */

--- a/parse/gram.y

+++ b/parse/gram.y

@@ -85,6 +85,8 @@

 %token<tok> Tmatch   /* match */

 %token<tok> Tdefault /* default */

 %token<tok> Tgoto    /* goto */

+%token<tok> Tbreak   /* break */

+%token<tok> Tcontinue   /* continue */

 %token<tok> Tintlit

 %token<tok> Tstrlit

@@ -134,7 +136,8 @@

 %type <tydef> tydef typeid

 %type <node> traitdef

-%type <node> exprln retexpr goto expr atomicexpr littok literal asnexpr lorexpr landexpr borexpr

+%type <node> exprln retexpr goto continue break expr atomicexpr

+%type <node> littok literal asnexpr lorexpr landexpr borexpr

 %type <node> bandexpr cmpexpr unionexpr addexpr mulexpr shiftexpr prefixexpr postfixexpr

 %type <node> funclit seqlit tuplit name block stmt label use

 %type <node> declbody declcore structent arrayelt structelt tuphead

@@ -699,6 +702,8 @@

 stmt    : goto

+        | break

+        | continue

         | retexpr

         | label

         | ifstmt

@@ -706,6 +711,14 @@

         | whilestmt

         | matchstmt

         | /* empty */ {$$ = NULL;}

+        ;

+break   : Tbreak

+     	    {$$ = mkexpr($1->line, Obreak, NULL);}

+        ;

+continue   : Tcontinue

+     	    {$$ = mkexpr($1->line, Ocontinue, NULL);}

 forstmt : Tfor optexprln optexprln optexprln block

--- a/parse/infer.c

+++ b/parse/infer.c

@@ -1190,6 +1190,11 @@

                 t =  unify(st, n, mktype(-1, Tyvoid), ret);

             settype(st, n, t);

             break;

+        case Obreak:

+        case Ocontinue:

+            /* nullary: nothing to infer. */

+            settype(st, n, mktype(-1, Tyvoid));

+            break;

         case Ojmp:     /* goto void* -> void */

             infersub(st, n, ret, sawret, &isconst);

             settype(st, n, mktype(-1, Tyvoid));

--- a/parse/ops.def

+++ b/parse/ops.def

@@ -45,7 +45,9 @@

 O(Ocall, 0)

 O(Ocast, 1)

 O(Oret, 1)

-O(Ojmp, 1)

+O(Ojmp, 0)

+O(Obreak, 0)

+O(Ocontinue, 0)

 O(Ovar, 1)

 O(Olit, 1)

 O(Olbl, 1)

--- a/parse/tok.c

+++ b/parse/tok.c

@@ -159,8 +159,10 @@

 static int kwd(char *s)

     static const struct {char* kw; int tt;} kwmap[] = {

+        {"break",       Tbreak},

         {"castto",      Tcast},

         {"const",       Tconst},

+        {"continue",    Tcontinue},

         {"default",     Tdefault},

         {"elif",        Telif},

         {"else",        Telse},

--- a/test/loop.myr

+++ b/test/loop.myr

@@ -5,8 +5,20 @@

 	var n

 	n = 0

+	for i = 0; i < 5; ++i

+		std.put("%i", i)

+	;;

+	for i = 0; i < 5; ++i

+		if i > 3

+			break

+		;;

+		std.put("%i", i)

+	;;

 	for i = 0; i < 10; ++i

-		n += i

+		if i < 6

+			continue

+		;;

+		std.put("%i", i)

;;

-	std.exit(n)

+	std.put("\n")

--- a/test/tests

+++ b/test/tests

@@ -56,7 +56,7 @@

 B callbig	E	42

 B nestfn	E	42

 # B closure	E	55      ## BUGGERED

-B loop		E	45

+B loop		P	0123401236789

 B subrangefor	P       12

 B patiter	P	23512

 B condiftrue	E	7

--

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