tree-object-size.c (addr_object_size): Always use object_size_type 0 or 2 when…

tree-object-size.c (addr_object_size): Always use object_size_type 0 or 2 when determining the pointer pointed object size.

	* tree-object-size.c (addr_object_size): Always use object_size_type
	0 or 2 when determining the pointer pointed object size.

	* gcc.dg/builtin-object-size-9.c: New test.

From-SVN: r151323

gcc/ChangeLog

+2009-09-02  Jakub Jelinek  <jakub@redhat.com>
+
+	* tree-object-size.c (addr_object_size): Always use object_size_type
+	0 or 2 when determining the pointer pointed object size.
+
 2009-09-02  Richard Guenther  <rguenther@suse.de>
 
 	Revert

gcc/testsuite/ChangeLog

+2009-09-02  Jakub Jelinek  <jakub@redhat.com>
+
+	* gcc.dg/builtin-object-size-9.c: New test.
+
 2009-09-02  Olivier Hainque  <hainque@adacore.com>
 
 	* gnat.dg/array7.ad[bs]: Add check for Signed_Integer_Type_Definition.

gcc/testsuite/gcc.dg/builtin-object-size-9.c

+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+typedef __SIZE_TYPE__ size_t;
+extern void *malloc (size_t);
+extern void free (void *);
+extern void abort (void);
+
+union U
+{
+  struct S { int a; int b; } s;
+  int t;
+};
+
+struct T
+{
+  int c;
+  char d[1];
+};
+
+int
+main (void)
+{
+  union U *u = malloc (sizeof (struct S) + sizeof (struct T) + 6);
+  struct T *t = (struct T *) (&u->s + 1);
+  if (__builtin_object_size (t->d, 1)
+      != sizeof (struct T) + 6 - __builtin_offsetof (struct T, d))
+    abort ();
+  free (u);
+  return 0;
+}

gcc/tree-object-size.c

@@ -171,9 +171,9 @@ addr_object_size (struct object_size_info *osi, const_tree ptr,
     {
       unsigned HOST_WIDE_INT sz;
 
-      if (!osi)
+      if (!osi || (object_size_type & 1) != 0)
 	sz = compute_builtin_object_size (TREE_OPERAND (pt_var, 0),
-					  object_size_type);
+					  object_size_type & ~1);
       else
 	{
 	  tree var = TREE_OPERAND (pt_var, 0);