gcc/testsuite/gcc.dg/pr85388-1.c

   1 /* This test needs to use setrlimit to set the stack size, so it can
   2    only run on Unix.  */
   3 /* { dg-do run { target { i?86-*-linux* i?86-*-gnu* x86_64-*-linux* } } } */
   4 /* { dg-require-effective-target cet } */
   5 /* { dg-require-effective-target split_stack } */
   6 /* { dg-options "-fsplit-stack -fcf-protection" } */
   7
   8 #include <stdlib.h>
   9 #include <sys/types.h>
  10 #include <sys/resource.h>
  11
  12 /* Use a noinline function to ensure that the buffer is not removed
  13    from the stack.  */
  14 static void use_buffer (char *buf) __attribute__ ((noinline));
  15 static void
  16 use_buffer (char *buf)
  17 {
  18   buf[0] = '\0';
  19 }
  20
  21 /* Each recursive call uses 10,000 bytes.  We call it 1000 times,
  22    using a total of 10,000,000 bytes.  If -fsplit-stack is not
  23    working, that will overflow our stack limit.  */
  24
  25 static void
  26 down (int i)
  27 {
  28   char buf[10000];
  29
  30   if (i > 0)
  31     {
  32       use_buffer (buf);
  33       down (i - 1);
  34     }
  35 }
  36
  37 int
  38 main (void)
  39 {
  40   struct rlimit r;
  41
  42   /* We set a stack limit because we are usually invoked via make, and
  43      make sets the stack limit to be as large as possible.  */
  44   r.rlim_cur = 8192 * 1024;
  45   r.rlim_max = 8192 * 1024;
  46   if (setrlimit (RLIMIT_STACK, &r) != 0)
  47     abort ();
  48   down (1000);
  49   return 0;
  50 }