PR tree-optimization/92349 - ICE in -Warray-bounds of a VLA member
gcc/testsuite/ChangeLog:
PR tree-optimization/92349
* gcc.dg/Warray-bounds-50.c: New test.
gcc/ChangeLog:
PR tree-optimization/92349
* tree-vrp.c (vrp_prop::check_array_ref): Avoid assuming struct
memebers have constant sizes.
===================================================================
@@ -4164,7 +4164,8 @@ vrp_prop::check_array_ref (location_t location, tr
/* Try to determine the size of the trailing array from
its initializer (if it has one). */
if (tree refsize = component_ref_size (arg, &interior_zero_len))
- maxbound = refsize;
+ if (TREE_CODE (refsize) == INTEGER_CST)
+ maxbound = refsize;
}
if (maxbound == ptrdiff_max
===================================================================
@@ -0,0 +1,114 @@
+/* PR middle-end/92349 - ICE in -Warray-bounds on a VLA member
+ { dg-do compile }
+ { dg-options "-O2 -Wall" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+void sink (void*, ...);
+
+void mem_vla_cst_store_idx (void)
+{
+ int n = 3;
+
+ struct {
+ char a[n], b;
+ } s;
+
+ char *p = s.a;
+
+ s.a[0] = 0;
+ s.b = 0;
+
+ *++p = 1;
+ *++p = 2;
+
+ sink (&s, p);
+}
+
+void mem_vla_range_store_idx (int n)
+{
+ if (n < 3 || 4 < n)
+ n = 3;
+
+ struct {
+ char a[n], b;
+ } s;
+
+ char *p = s.a;
+
+ s.a[0] = 0;
+ s.b = 0;
+
+ *++p = 1;
+ *++p = 2;
+
+ sink (&s, p);
+}
+
+void mem_vla_var_store_idx (size_t n)
+{
+ struct {
+ char a[n], b;
+ } s;
+
+ char *p = s.a;
+
+ s.a[0] = 0;
+ s.b = 0;
+
+ *++p = 1;
+ *++p = 2;
+
+ sink (&s, p);
+}
+
+
+void mem_vla_cst_store_ptr (void)
+{
+ int n = 3;
+
+ struct {
+ char a[n], b;
+ } s;
+
+ char *p = s.a;
+
+ *p++ = __LINE__;
+ *p++ = __LINE__;
+ *p++ = __LINE__;
+
+ sink (&s, p);
+}
+
+void mem_vla_range_store_ptr (int n)
+{
+ if (n < 3 || 4 < n)
+ n = 3;
+
+ struct {
+ char a[n], b;
+ } s;
+
+ char *p = s.a;
+
+ *p++ = __LINE__;
+ *p++ = __LINE__;
+ *p++ = __LINE__;
+
+ sink (&s, p);
+}
+
+void mem_vla_var_store_ptr (size_t n)
+{
+ struct {
+ char a[n], b;
+ } s;
+
+ char *p = s.a;
+
+ *p++ = __LINE__;
+ *p++ = __LINE__;
+ *p++ = __LINE__;
+
+ sink (&s, p);
+}