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 <string.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, size_t) __attribute__ ((noinline));
15 static void
use_buffer(char * buf,size_t c)16 use_buffer (char *buf, size_t c)
17 {
18 size_t i;
19
20 for (i = 0; i < c; ++i)
21 buf[i] = (char) i;
22 }
23
24 /* Each recursive call uses 10 * i bytes. We call it 1000 times,
25 using a total of 5,000,000 bytes. If -fsplit-stack is not working,
26 that will overflow our stack limit. */
27
28 static void
down1(int i)29 down1 (int i)
30 {
31 char buf[10 * i];
32
33 if (i > 0)
34 {
35 use_buffer (buf, 10 * i);
36 down1 (i - 1);
37 }
38 }
39
40 /* Same thing, using alloca. */
41
42 static void
down2(int i)43 down2 (int i)
44 {
45 char *buf = alloca (10 * i);
46
47 if (i > 0)
48 {
49 use_buffer (buf, 10 * i);
50 down2 (i - 1);
51 }
52 }
53
54 int
main(void)55 main (void)
56 {
57 struct rlimit r;
58
59 /* We set a stack limit because we are usually invoked via make, and
60 make sets the stack limit to be as large as possible. */
61 r.rlim_cur = 8192 * 1024;
62 r.rlim_max = 8192 * 1024;
63 if (setrlimit (RLIMIT_STACK, &r) != 0)
64 abort ();
65 down1 (1000);
66 down2 (1000);
67 return 0;
68 }
69