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

   1 /* { dg-require-effective-target return_address } */
   2 int check_fa_work (const char *, const char *) __attribute__((noinline));
   3 int check_fa_mid (const char *) __attribute__((noinline));
   4 int check_fa (char *) __attribute__((noinline));
   5 int how_much (void) __attribute__((noinline));
   6
   7 int check_fa_work (const char *c, const char *f)
   8 {
   9   const char d = 0;
  10
  11   if (c >= &d)
  12     return c >= f && f >= &d;
  13   else
  14     return c <= f && f <= &d;
  15 }
  16
  17 int check_fa_mid (const char *c)
  18 {
  19   const char *f = __builtin_frame_address (0);
  20
  21   /* Prevent a tail call to check_fa_work, eliding the current stack frame.  */
  22   return check_fa_work (c, f) != 0;
  23 }
  24
  25 int check_fa (char *unused)
  26 {
  27   const char c = 0;
  28
  29   /* Prevent a tail call to check_fa_mid, eliding the current stack frame.  */
  30   return check_fa_mid (&c) != 0;
  31 }
  32
  33 int how_much (void)
  34 {
  35         return 8;
  36 }
  37
  38 int main (void)
  39 {
  40   char *unused = __builtin_alloca (how_much ());
  41
  42   if (!check_fa(unused))
  43     abort();
  44   return 0;
  45 }