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glibc/debug/backtracesyms.c
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/* Return list with names for address in backtrace. | |
Copyright (C) 1998-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <assert.h> | |
#include <execinfo.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <ldsodefs.h> | |
#if __ELF_NATIVE_CLASS == 32 | |
# define WORD_WIDTH 8 | |
#else | |
/* We assume 64bits. */ | |
# define WORD_WIDTH 16 | |
#endif | |
char ** | |
__backtrace_symbols (void *const *array, int size) | |
{ | |
Dl_info info[size]; | |
int status[size]; | |
int cnt; | |
size_t total = 0; | |
char **result; | |
/* Fill in the information we can get from `dladdr'. */ | |
for (cnt = 0; cnt < size; ++cnt) | |
{ | |
struct link_map *map; | |
status[cnt] = _dl_addr (array[cnt], &info[cnt], &map, NULL); | |
if (status[cnt] && info[cnt].dli_fname && info[cnt].dli_fname[0] != '\0') | |
{ | |
/* We have some info, compute the length of the string which will be | |
"<file-name>(<sym-name>+offset) [address]. */ | |
total += (strlen (info[cnt].dli_fname ?: "") | |
+ strlen (info[cnt].dli_sname ?: "") | |
+ 3 + WORD_WIDTH + 3 + WORD_WIDTH + 5); | |
/* The load bias is more useful to the user than the load | |
address. The use of these addresses is to calculate an | |
address in the ELF file, so its prelinked bias is not | |
something we want to subtract out. */ | |
info[cnt].dli_fbase = (void *) map->l_addr; | |
} | |
else | |
total += 5 + WORD_WIDTH; | |
} | |
/* Allocate memory for the result. */ | |
result = (char **) malloc (size * sizeof (char *) + total); | |
if (result != NULL) | |
{ | |
char *last = (char *) (result + size); | |
for (cnt = 0; cnt < size; ++cnt) | |
{ | |
result[cnt] = last; | |
if (status[cnt] | |
&& info[cnt].dli_fname != NULL && info[cnt].dli_fname[0] != '\0') | |
{ | |
if (info[cnt].dli_sname == NULL) | |
/* We found no symbol name to use, so describe it as | |
relative to the file. */ | |
info[cnt].dli_saddr = info[cnt].dli_fbase; | |
if (info[cnt].dli_sname == NULL && info[cnt].dli_saddr == 0) | |
last += 1 + sprintf (last, "%s(%s) [%p]", | |
info[cnt].dli_fname ?: "", | |
info[cnt].dli_sname ?: "", | |
array[cnt]); | |
else | |
{ | |
char sign; | |
ptrdiff_t offset; | |
if (array[cnt] >= (void *) info[cnt].dli_saddr) | |
{ | |
sign = '+'; | |
offset = array[cnt] - info[cnt].dli_saddr; | |
} | |
else | |
{ | |
sign = '-'; | |
offset = info[cnt].dli_saddr - array[cnt]; | |
} | |
last += 1 + sprintf (last, "%s(%s%c%#tx) [%p]", | |
info[cnt].dli_fname ?: "", | |
info[cnt].dli_sname ?: "", | |
sign, offset, array[cnt]); | |
} | |
} | |
else | |
last += 1 + sprintf (last, "[%p]", array[cnt]); | |
} | |
assert (last <= (char *) result + size * sizeof (char *) + total); | |
} | |
return result; | |
} | |
weak_alias (__backtrace_symbols, backtrace_symbols) |