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c/99224 - avoid ICEing on invalid __builtin_next_arg

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This avoids crashes with __builtin_next_arg on non-parameters.  For
the specific testcase we arrive with an anonymous SSA_NAME so that
SSA_NAME_VAR becomes NULL and we crash.

2021-02-24  Richard Biener  <rguenther@suse.de>

	PR c/99224
	* builtins.c (fold_builtin_next_arg): Avoid NULL arg.

	* gcc.dg/pr99224.c: New testcase.
This commit is contained in:
Richard Biener 2021-02-24 09:18:05 +01:00
parent 71e24b0601
commit 084963dcac
2 changed files with 8 additions and 1 deletions
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3
gcc/builtins.c
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@ -12597,7 +12597,8 @@ fold_builtin_next_arg (tree exp, bool va_start_p)
arg = CALL_EXPR_ARG (exp, 0);
}
if (TREE_CODE (arg) == SSA_NAME)
if (TREE_CODE (arg) == SSA_NAME
&& SSA_NAME_VAR (arg))
arg = SSA_NAME_VAR (arg);
/* We destructively modify the call to be __builtin_va_start (ap, 0)

6
gcc/testsuite/gcc.dg/pr99224.c Normal file
View File

@ -0,0 +1,6 @@
/* { dg-do compile } */
void f (char *c, ...)
{
__builtin_next_arg (*c); /* { dg-warning "not last named argument" } */
}