gcc/testsuite/gcc.dg/split-3.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 <stdarg.h>
   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   va_list ap;
  30
  31   va_start (ap, i);
  32   if (va_arg (ap, int) != 1
  33       || va_arg (ap, int) != 2
  34       || va_arg (ap, int) != 3
  35       || va_arg (ap, int) != 4
  36       || va_arg (ap, int) != 5
  37       || va_arg (ap, int) != 6
  38       || va_arg (ap, int) != 7
  39       || va_arg (ap, int) != 8
  40       || va_arg (ap, int) != 9
  41       || va_arg (ap, int) != 10)
  42     abort ();
  43
  44   if (i > 0)
  45     {
  46       use_buffer (buf);
  47       down (i - 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
  48     }
  49 }
  50
  51 int
  52 main (void)
  53 {
  54   struct rlimit r;
  55
  56   /* We set a stack limit because we are usually invoked via make, and
  57      make sets the stack limit to be as large as possible.  */
  58   r.rlim_cur = 8192 * 1024;
  59   r.rlim_max = 8192 * 1024;
  60   if (setrlimit (RLIMIT_STACK, &r) != 0)
  61     abort ();
  62   down (1000, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
  63   return 0;
  64 }