gcc/testsuite/c-c++-common/asan/pointer-subtract-2.c

   1 /* { dg-do run } */
   2 /* { dg-set-target-env-var ASAN_OPTIONS "detect_invalid_pointer_pairs=2 halt_on_error=1" } */
   3 /* { dg-options "-fsanitize=address,pointer-subtract" } */
   4
   5 volatile __PTRDIFF_TYPE__ v;
   6
   7 void
   8 bar (char *p, char *q)
   9 {
  10   v = q - p;
  11   v = p - q;
  12 }
  13
  14 char global[10000] = {};
  15
  16 int
  17 main ()
  18 {
  19   /* Heap allocated memory.  */
  20   char *p = (char *)__builtin_malloc (42);
  21   bar (p, p + 20);
  22   __builtin_free (p);
  23
  24   /* Global variable.  */
  25   bar (&global[0], &global[100]);
  26   bar (&global[1000], &global[9000]);
  27   bar (&global[500], &global[10]);
  28   bar (&global[0], &global[10000]);
  29
  30   /* Stack variable.  */
  31   char stack[10000];
  32   bar (&stack[0], &stack[100]);
  33   bar (&stack[1000], &stack[9000]);
  34   bar (&stack[500], &stack[10]);
  35
  36   return 0;
  37 }