access_ref pref, qref;
if (!qry.get_ref (p, stmt, &pref, 0)
|| !qry.get_ref (q, stmt, &qref, 0))
- return true;
+ /* GET_REF() only rarely fails. When it does, it's likely because
+ it involves a self-referential PHI. Return a conservative result. */
+ return false;
return pref.ref == qref.ref;
}
--- /dev/null
+/* PR middle-end/104069 - -Werror=use-after-free false positive on
+ elfutils-0.186
+ { dg-do compile }
+ { dg-options "-Wall" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+extern void* realloc (void *, size_t);
+
+void* __libdw_unzstd (size_t todo)
+{
+ void *sb = 0;
+
+ for ( ; ; )
+ {
+ // Ran only once.
+ if (!sb)
+ {
+ char *b = realloc (sb, todo);
+ if (!b)
+ break;
+
+ sb = b;
+ }
+
+ todo -= 1;
+ if (todo == 0)
+ break;
+ }
+
+ // Shrink buffer: leave only one byte for simplicity.
+ char *b = realloc (sb, 1);
+ if (b)
+ sb = b;
+ else
+ {
+ // Realloc failed mysteriously, leave 'sb' untouched.
+ }
+
+ return sb; // { dg-bogus "-Wuse-after-free" }
+}