105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2011-2016 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Based on the gcc testcase `gcc/testsuite/gcc.dg/split-1.c'. This test
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needs to use setrlimit to set the stack size, so it can only run on Unix.
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*/
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/resource.h>
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#include <stdio.h>
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#include <sys/mman.h>
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/* Use a noinline function to ensure that the buffer is not removed
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from the stack. */
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static void use_buffer (char *buf) __attribute__ ((noinline));
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static void
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use_buffer (char *buf)
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{
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buf[0] = '\0';
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}
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static volatile int marker_var;
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static void
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marker_miss (void)
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{
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marker_var = 0;
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}
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static void
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marker_hit (void)
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{
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marker_var = 0;
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}
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void *reserved;
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#define RESERVED_SIZE 0x1000000
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/* Each recursive call uses 10,000 bytes. We call it 1000 times,
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using a total of 10,000,000 bytes. If -fsplit-stack is not
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working, that will overflow our stack limit. */
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static void
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down (int i)
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{
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char buf[10000];
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static void *last;
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if (last && last < (void *) buf)
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{
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printf ("%d: %p < %p\n", i, last, buf);
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marker_hit ();
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}
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last = buf;
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if (i == 500)
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{
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if (munmap (reserved, RESERVED_SIZE) != 0)
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abort ();
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reserved = NULL;
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}
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if (i > 0)
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{
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use_buffer (buf);
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down (i - 1);
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}
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else
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marker_miss ();
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}
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int
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main (void)
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{
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struct rlimit r;
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reserved = mmap (NULL, RESERVED_SIZE, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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if (reserved == MAP_FAILED)
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abort ();
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/* We set a stack limit because we are usually invoked via make, and
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make sets the stack limit to be as large as possible. */
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r.rlim_cur = 8192 * 1024;
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r.rlim_max = 8192 * 1024;
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if (setrlimit (RLIMIT_STACK, &r) != 0)
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abort ();
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down (1000);
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return 0;
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}
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