[PATCH] tree-optimization/117254 - ICE with access diangostics

[Richard Biener]

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

Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.

        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.
---
 gcc/gimple-ssa-warn-access.cc   |  3 ++-
 gcc/testsuite/gcc.dg/pr117254.c | 10 ++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.dg/pr117254.c

diff --git a/gcc/gimple-ssa-warn-access.cc b/gcc/gimple-ssa-warn-access.cc
index 950d96bf9d6..5061af389c2 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 00000000000..c7a510677f1
--- /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);
+}
-- 
2.43.0