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ebedcab5 JK |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
3 | Copyright 2011 Free Software Foundation, Inc. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | /* Based on the gcc testcase `gcc/testsuite/gcc.dg/split-1.c'. This test | |
19 | needs to use setrlimit to set the stack size, so it can only run on Unix. | |
20 | */ | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/resource.h> | |
25 | #include <stdio.h> | |
26 | #include <sys/mman.h> | |
27 | ||
28 | /* Use a noinline function to ensure that the buffer is not removed | |
29 | from the stack. */ | |
30 | static void use_buffer (char *buf) __attribute__ ((noinline)); | |
31 | static void | |
32 | use_buffer (char *buf) | |
33 | { | |
34 | buf[0] = '\0'; | |
35 | } | |
36 | ||
37 | static volatile int marker_var; | |
38 | ||
39 | static void | |
40 | marker_miss (void) | |
41 | { | |
42 | marker_var = 0; | |
43 | } | |
44 | ||
45 | static void | |
46 | marker_hit (void) | |
47 | { | |
48 | marker_var = 0; | |
49 | } | |
50 | ||
51 | void *reserved; | |
52 | #define RESERVED_SIZE 0x1000000 | |
53 | ||
54 | /* Each recursive call uses 10,000 bytes. We call it 1000 times, | |
55 | using a total of 10,000,000 bytes. If -fsplit-stack is not | |
56 | working, that will overflow our stack limit. */ | |
57 | ||
58 | static void | |
59 | down (int i) | |
60 | { | |
61 | char buf[10000]; | |
62 | static void *last; | |
63 | ||
64 | if (last && last < (void *) buf) | |
65 | { | |
66 | printf ("%d: %p < %p\n", i, last, buf); | |
67 | marker_hit (); | |
68 | } | |
69 | last = buf; | |
70 | ||
71 | if (i == 500) | |
72 | { | |
73 | if (munmap (reserved, RESERVED_SIZE) != 0) | |
74 | abort (); | |
75 | reserved = NULL; | |
76 | } | |
77 | ||
78 | if (i > 0) | |
79 | { | |
80 | use_buffer (buf); | |
81 | down (i - 1); | |
82 | } | |
83 | else | |
84 | marker_miss (); | |
85 | } | |
86 | ||
87 | int | |
88 | main (void) | |
89 | { | |
90 | struct rlimit r; | |
91 | ||
92 | reserved = mmap (NULL, RESERVED_SIZE, PROT_READ | PROT_WRITE, | |
93 | MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); | |
94 | if (reserved == MAP_FAILED) | |
95 | abort (); | |
96 | ||
97 | /* We set a stack limit because we are usually invoked via make, and | |
98 | make sets the stack limit to be as large as possible. */ | |
99 | r.rlim_cur = 8192 * 1024; | |
100 | r.rlim_max = 8192 * 1024; | |
101 | if (setrlimit (RLIMIT_STACK, &r) != 0) | |
102 | abort (); | |
103 | down (1000); | |
104 | return 0; | |
105 | } |