gcc/testsuite/gcc.c-torture/execute/frame-address.c

   1 int check_fa_work (const char *, const char *) __attribute__((noinline));
   2 int check_fa_mid (const char *) __attribute__((noinline));
   3 int check_fa (char *) __attribute__((noinline));
   4 int how_much (void) __attribute__((noinline));
   5
   6 int check_fa_work (const char *c, const char *f)
   7 {
   8   const char d = 0;
   9
  10   if (c >= &d)
  11     return c >= f && f >= &d;
  12   else
  13     return c <= f && f <= &d;
  14 }
  15
  16 int check_fa_mid (const char *c)
  17 {
  18   const char *f = __builtin_frame_address (0);
  19
  20   /* Prevent a tail call to check_fa_work, eliding the current stack frame.  */
  21   return check_fa_work (c, f) != 0;
  22 }
  23
  24 int check_fa (char *unused)
  25 {
  26   const char c = 0;
  27
  28   /* Prevent a tail call to check_fa_mid, eliding the current stack frame.  */
  29   return check_fa_mid (&c) != 0;
  30 }
  31
  32 int how_much (void)
  33 {
  34         return 8;
  35 }
  36
  37 int main (void)
  38 {
  39   char *unused = __builtin_alloca (how_much ());
  40
  41   if (!check_fa(unused))
  42     abort();
  43   return 0;
  44 }