gcc/testsuite/gcc.dg/builtin-object-size-7.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2" } */
   3
   4 typedef __SIZE_TYPE__ size_t;
   5 extern void *malloc (size_t);
   6 extern void abort (void);
   7
   8 struct A
   9 {
  10   int i, j, k;
  11   char buf[255];
  12   int l, m, n, o;
  13 };
  14
  15 int
  16 main (void)
  17 {
  18   const size_t s = sizeof (struct A);
  19   const size_t o = __builtin_offsetof (struct A, buf);
  20   struct A *a = malloc (s);
  21   struct A *b = malloc (o + 212);
  22   if (__builtin_object_size (a->buf, 0) != s - o)
  23     abort ();
  24   if (__builtin_object_size (a->buf, 1) != sizeof (a->buf))
  25     abort ();
  26   if (__builtin_object_size (a->buf, 2) != s - o)
  27     abort ();
  28   if (__builtin_object_size (a->buf, 3) != sizeof (a->buf))
  29     abort ();
  30   if (__builtin_object_size (&a->buf[0], 0) != s - o)
  31     abort ();
  32   if (__builtin_object_size (&a->buf[0], 1) != sizeof (a->buf))
  33     abort ();
  34   if (__builtin_object_size (&a->buf[0], 2) != s - o)
  35     abort ();
  36   if (__builtin_object_size (&a->buf[0], 3) != sizeof (a->buf))
  37     abort ();
  38   if (__builtin_object_size (&a->buf[6], 0) != s - o - 6)
  39     abort ();
  40   if (__builtin_object_size (&a->buf[6], 1) != sizeof (a->buf) - 6)
  41     abort ();
  42   if (__builtin_object_size (&a->buf[6], 2) != s - o - 6)
  43     abort ();
  44   if (__builtin_object_size (&a->buf[6], 3) != sizeof (a->buf) - 6)
  45     abort ();
  46   if (__builtin_object_size (b->buf, 0) != 212)
  47     abort ();
  48   if (__builtin_object_size (b->buf, 1) != 212)
  49     abort ();
  50   if (__builtin_object_size (b->buf, 2) != 212)
  51     abort ();
  52   if (__builtin_object_size (b->buf, 3) != 212)
  53     abort ();
  54   if (__builtin_object_size (&b->buf[0], 0) != 212)
  55     abort ();
  56   if (__builtin_object_size (&b->buf[0], 1) != 212)
  57     abort ();
  58   if (__builtin_object_size (&b->buf[0], 2) != 212)
  59     abort ();
  60   if (__builtin_object_size (&b->buf[0], 3) != 212)
  61     abort ();
  62   if (__builtin_object_size (&b->buf[28], 0) != 212 - 28)
  63     abort ();
  64   if (__builtin_object_size (&b->buf[28], 1) != 212 - 28)
  65     abort ();
  66   if (__builtin_object_size (&b->buf[28], 2) != 212 - 28)
  67     abort ();
  68   if (__builtin_object_size (&b->buf[28], 3) != 212 - 28)
  69     abort ();
  70   return 0;
  71 }