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/* This testcase is part of GDB, the GNU debugger.
Copyright 2011-2017 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Based on the gcc testcase `gcc/testsuite/gcc.dg/split-1.c'. This test
needs to use setrlimit to set the stack size, so it can only run on Unix.
*/
#include <stdlib.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <stdio.h>
#include <sys/mman.h>
/* Use a noinline function to ensure that the buffer is not removed
from the stack. */
static void use_buffer (char *buf) __attribute__ ((noinline));
static void
use_buffer (char *buf)
{
buf[0] = '\0';
}
static volatile int marker_var;
static void
marker_miss (void)
{
marker_var = 0;
}
static void
marker_hit (void)
{
marker_var = 0;
}
void *reserved;
#define RESERVED_SIZE 0x1000000
/* Each recursive call uses 10,000 bytes. We call it 1000 times,
using a total of 10,000,000 bytes. If -fsplit-stack is not
working, that will overflow our stack limit. */
static void
down (int i)
{
char buf[10000];
static void *last;
if (last && last < (void *) buf)
{
printf ("%d: %p < %p\n", i, last, buf);
marker_hit ();
}
last = buf;
if (i == 500)
{
if (munmap (reserved, RESERVED_SIZE) != 0)
abort ();
reserved = NULL;
}
if (i > 0)
{
use_buffer (buf);
down (i - 1);
}
else
marker_miss ();
}
int
main (void)
{
struct rlimit r;
reserved = mmap (NULL, RESERVED_SIZE, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (reserved == MAP_FAILED)
abort ();
/* We set a stack limit because we are usually invoked via make, and
make sets the stack limit to be as large as possible. */
r.rlim_cur = 8192 * 1024;
r.rlim_max = 8192 * 1024;
if (setrlimit (RLIMIT_STACK, &r) != 0)
abort ();
down (1000);
return 0;
}
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