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