From: Richard Biener <rguenther@suse.de>
Date: Tue, 22 Oct 2024 09:46:47 +0000 (+0200)
Subject: tree-optimization/117254 - ICE with access diangostics
X-Git-Tag: basepoints/gcc-16~5012
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d464a52d0678dfea523a60efe8b792ba1b8d40db;p=thirdparty%2Fgcc.git

tree-optimization/117254 - ICE with access diangostics

The diagnostics code fails to handle non-constant domain max.

	PR tree-optimization/117254
	* gimple-ssa-warn-access.cc (maybe_warn_nonstring_arg):
	Check the array domain max is constant before using it.

	* gcc.dg/pr117254.c: New testcase.
---

diff --git a/gcc/gimple-ssa-warn-access.cc b/gcc/gimple-ssa-warn-access.cc
index 950d96bf9d62..5061af389c23 100644
--- a/gcc/gimple-ssa-warn-access.cc
+++ b/gcc/gimple-ssa-warn-access.cc
@@ -607,7 +607,8 @@ maybe_warn_nonstring_arg (tree fndecl, GimpleOrTree exp)
 	{
 	  if (tree arrbnd = TYPE_DOMAIN (type))
 	    {
-	      if ((arrbnd = TYPE_MAX_VALUE (arrbnd)))
+	      if ((arrbnd = TYPE_MAX_VALUE (arrbnd))
+		  && TREE_CODE (arrbnd) == INTEGER_CST)
 		{
 		  asize = wi::to_offset (arrbnd) + 1;
 		  known_size = true;
diff --git a/gcc/testsuite/gcc.dg/pr117254.c b/gcc/testsuite/gcc.dg/pr117254.c
new file mode 100644
index 000000000000..c7a510677f13
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr117254.c
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+int g;
+void e(int s) {
+  struct {
+    __attribute__((nonstring)) char bn[g];
+  } f;
+  __builtin_strncpy (f.bn, f.bn, s);
+}