1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
#if defined(__linux__)
# define HAVE_LINE_INFO
#endif
void
libtest_print_backtrace(FILE *fp, const char *prefix, const char *indent, size_t first,
const struct backtrace *backtrace, ucontext_t *ucontext)
{
static _Thread_local int recursion_guard = 0;
int saved_errno;
unw_word_t rip;
unw_cursor_t cursor;
unw_context_t context;
Dwarf_Addr ip;
size_t i;
#if defined(HAVE_LINE_INFO)
Dwfl_Callbacks callbacks;
char *debuginfo_path = NULL;
Dwfl *dwfl = NULL;
Dwfl_Line *line = NULL;
Dwfl_Module *module = NULL;
int lineno = 0; /* initialised for compiler happiness */
const char *filename = NULL;
const char *funcname = NULL;
#endif
if (recursion_guard)
return;
saved_errno = errno;
recursion_guard = 1;
libtest_malloc_internal_usage++;
if (!prefix)
prefix = indent;
if (!indent)
indent = prefix;
if (!prefix || !indent)
abort();
if (backtrace) {
if (ucontext) {
abort();
}
} else if (ucontext) {
if (unw_init_local2(&cursor, (unw_context_t *)ucontext, UNW_INIT_SIGNAL_FRAME))
goto out;
} else {
if (unw_getcontext(&context))
goto out;
if (unw_init_local(&cursor, &context))
goto out;
}
#if defined(__linux__)
memset(&callbacks, 0, sizeof(callbacks));
callbacks.find_elf = &dwfl_linux_proc_find_elf;
callbacks.find_debuginfo = &dwfl_standard_find_debuginfo;
callbacks.section_address = NULL;
callbacks.debuginfo_path = &debuginfo_path;
dwfl = dwfl_begin(&callbacks);
if (dwfl) {
if (dwfl_linux_proc_report(dwfl, getpid()) ||
dwfl_report_end(dwfl, NULL, NULL)) {
dwfl_end(dwfl);
dwfl = NULL;
}
}
#endif
for (i = 0u; backtrace ? i < backtrace->n : unw_step(&cursor) > 0; i++) {
if (backtrace) {
ip = backtrace->trace[i];
} else {
if (unw_get_reg(&cursor, UNW_REG_IP, &rip))
break;
ip = (Dwarf_Addr)rip;
}
if (i < first)
continue;
#if defined(HAVE_LINE_INFO)
if (dwfl) {
module = dwfl_addrmodule(dwfl, ip);
funcname = module ? dwfl_module_addrname(module, ip) : NULL;
line = dwfl_getsrc(dwfl, ip);
if (line) {
filename = dwfl_lineinfo(line, &(Dwarf_Addr){0}, &lineno, NULL, NULL, NULL);
# ifdef USE_BASENAMES_IN_BACKTRACES
if (strrchr(filename, '/'))
filename = &strrchr(filename, '/')[1];
# endif
}
}
#endif
#if defined(HAVE_LINE_INFO)
fprintf(fp, "%s0x%016"PRIxPTR": %s", prefix, (uintptr_t)ip, funcname ? funcname : "???");
if (line)
fprintf(fp, " (%s:%i)\n", filename, lineno);
else
fprintf(fp, "\n");
#else
fprintf(fp, "%s0x%016"PRIxPTR"\n", prefix, (uintptr_t)ip);
#endif
prefix = indent;
}
#if defined(HAVE_LINE_INFO)
if (dwfl)
dwfl_end(dwfl);
#endif
out:
libtest_malloc_internal_usage--;
recursion_guard = 0;
errno = saved_errno;
}
#else
CONST int
main(void)
{
/* How would one even test this, and what would be the point? */
return 0;
}
#endif
|
