1 /* Test backtrace and backtrace_symbols.
2 Copyright (C) 2009-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library 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 GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <execinfo.h>
20 #include <search.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24
25 #include "tst-backtrace.h"
26
27 /* The backtrace should include at least f1, f2, f3, and do_test. */
28 #define NUM_FUNCTIONS 4
29
30 NO_INLINE void
fn1(void)31 fn1 (void)
32 {
33 void *addresses[NUM_FUNCTIONS];
34 char **symbols;
35 int n;
36 int i;
37
38 /* Get the backtrace addresses. */
39 n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0]));
40 printf ("Obtained backtrace with %d functions\n", n);
41 /* Check that there are at least four functions. */
42 if (n < NUM_FUNCTIONS)
43 {
44 FAIL ();
45 return;
46 }
47 /* Convert them to symbols. */
48 symbols = backtrace_symbols (addresses, n);
49 /* Check that symbols were obtained. */
50 if (symbols == NULL)
51 {
52 FAIL ();
53 return;
54 }
55 for (i = 0; i < n; ++i)
56 printf ("Function %d: %s\n", i, symbols[i]);
57 /* Check that the function names obtained are accurate. */
58 if (!match (symbols[0], "fn1"))
59 {
60 FAIL ();
61 return;
62 }
63 /* Symbol names are not available for static functions, so we do not
64 check f2. */
65 if (!match (symbols[2], "fn3"))
66 {
67 FAIL ();
68 return;
69 }
70 /* Symbol names are not available for static functions, so we do not
71 check do_test. */
72 }
73
74 NO_INLINE int
fn2(void)75 fn2 (void)
76 {
77 fn1 ();
78 /* Prevent tail calls. */
79 return x;
80 }
81
82 NO_INLINE int
fn3(void)83 fn3 (void)
84 {
85 fn2();
86 /* Prevent tail calls. */
87 return x;
88 }
89
90 NO_INLINE int
do_test(void)91 do_test (void)
92 {
93 /* Test BZ #18084. */
94 void *buffer[1];
95
96 if (backtrace (buffer, 0) != 0)
97 FAIL ();
98
99 fn3 ();
100 return ret;
101 }
102
103 #include <support/test-driver.c>
104