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cc: fix void cast crash

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the following code reproduces the crash:

void
foo(void)
{
}

void
main(int argc, char **argv)
{
	(void)(1 ? (void)0 : foo());
}

the problem is that side() gives a false positive on the OCOND
with later constant folding eleminating the acutal side effect
and OCAST ending up with two nested OCATS with the nested one
being zapped (type == T).
This commit is contained in:
cinap_lenrek 2019-09-07 02:11:18 +02:00
parent d1204d9b80
commit 766a641d25
1 changed files with 5 additions and 0 deletions
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5
sys/src/cmd/cc/com.c
View file

@ -1081,6 +1081,11 @@ loop:
if(castucom(n)) if(castucom(n))
warn(n, "32-bit unsigned complement zero-extended to 64 bits"); warn(n, "32-bit unsigned complement zero-extended to 64 bits");
ccom(l); ccom(l);
if(l->type == T){
n->left = Z;
n->type = T;
break;
}
if(l->op == OCONST) { if(l->op == OCONST) {
evconst(n); evconst(n);
if(n->op == OCONST) if(n->op == OCONST)