120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/* Return list with names for address in backtrace.
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Copyright (C) 1998-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <execinfo.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ldsodefs.h>
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#if __ELF_NATIVE_CLASS == 32
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# define WORD_WIDTH 8
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#else
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/* We assume 64bits. */
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# define WORD_WIDTH 16
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#endif
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char **
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__backtrace_symbols (void *const *array, int size)
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{
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Dl_info info[size];
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int status[size];
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int cnt;
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size_t total = 0;
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char **result;
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/* Fill in the information we can get from `dladdr'. */
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for (cnt = 0; cnt < size; ++cnt)
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{
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struct link_map *map;
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status[cnt] = _dl_addr (array[cnt], &info[cnt], &map, NULL);
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if (status[cnt] && info[cnt].dli_fname && info[cnt].dli_fname[0] != '\0')
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{
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/* We have some info, compute the length of the string which will be
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"<file-name>(<sym-name>+offset) [address]. */
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total += (strlen (info[cnt].dli_fname ?: "")
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+ strlen (info[cnt].dli_sname ?: "")
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+ 3 + WORD_WIDTH + 3 + WORD_WIDTH + 5);
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/* The load bias is more useful to the user than the load
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address. The use of these addresses is to calculate an
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address in the ELF file, so its prelinked bias is not
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something we want to subtract out. */
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info[cnt].dli_fbase = (void *) map->l_addr;
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}
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else
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total += 5 + WORD_WIDTH;
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}
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/* Allocate memory for the result. */
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result = (char **) malloc (size * sizeof (char *) + total);
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if (result != NULL)
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{
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char *last = (char *) (result + size);
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for (cnt = 0; cnt < size; ++cnt)
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{
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result[cnt] = last;
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if (status[cnt]
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&& info[cnt].dli_fname != NULL && info[cnt].dli_fname[0] != '\0')
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{
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if (info[cnt].dli_sname == NULL)
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/* We found no symbol name to use, so describe it as
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relative to the file. */
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info[cnt].dli_saddr = info[cnt].dli_fbase;
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if (info[cnt].dli_sname == NULL && info[cnt].dli_saddr == 0)
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last += 1 + sprintf (last, "%s(%s) [%p]",
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info[cnt].dli_fname ?: "",
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info[cnt].dli_sname ?: "",
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array[cnt]);
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else
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{
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char sign;
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ptrdiff_t offset;
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if (array[cnt] >= (void *) info[cnt].dli_saddr)
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{
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sign = '+';
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offset = array[cnt] - info[cnt].dli_saddr;
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}
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else
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{
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sign = '-';
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offset = info[cnt].dli_saddr - array[cnt];
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}
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last += 1 + sprintf (last, "%s(%s%c%#tx) [%p]",
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info[cnt].dli_fname ?: "",
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info[cnt].dli_sname ?: "",
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sign, offset, array[cnt]);
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}
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}
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else
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last += 1 + sprintf (last, "[%p]", array[cnt]);
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}
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assert (last <= (char *) result + size * sizeof (char *) + total);
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}
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return result;
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}
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weak_alias (__backtrace_symbols, backtrace_symbols)
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