demangle.c revision 98ff309cdc98857eb30992f108439cb7d7673598 
1/*
2 * This file is part of ltrace.
3 * Copyright (C) 2012,2013 Petr Machata, Red Hat Inc.
4 * Copyright (C) 1998,1999,2003,2004,2008,2009 Juan Cespedes
5 * Copyright (C) 2006 Ian Wienand
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 */
22
23#include "config.h"
24
25#include <string.h>
26#include <stdlib.h>
27#include <stdio.h>
28
29#include "common.h"
30
31#ifdef USE_DEMANGLE
32
33/*****************************************************************************/
34
35static struct dict *name_cache = NULL;
36
37const char *
38my_demangle(const char *function_name) {
39#ifdef USE_CXA_DEMANGLE
40	extern char *__cxa_demangle(const char *, char *, size_t *, int *);
41#endif
42
43	debug(DEBUG_FUNCTION, "my_demangle(name=%s)", function_name);
44
45	if (name_cache == NULL) {
46		name_cache = malloc(sizeof(*name_cache));
47		if (name_cache != NULL)
48			DICT_INIT(name_cache, const char *, const char *,
49				  dict_hash_string, dict_eq_string, NULL);
50	}
51
52	const char *tmp = NULL;
53	if (name_cache != NULL
54	    && DICT_FIND_VAL(name_cache, &function_name, &tmp) == 0)
55		return tmp;
56
57#ifdef HAVE_LIBIBERTY
58	tmp = cplus_demangle(function_name,
59					 DMGL_ANSI | DMGL_PARAMS);
60#elif defined USE_CXA_DEMANGLE
61	int status = 0;
62	tmp = __cxa_demangle(function_name, NULL, NULL, &status);
63#endif
64	if (name_cache == NULL || tmp == NULL) {
65	fail:
66		if (tmp == NULL)
67			return function_name;
68		return tmp;
69	}
70
71	const char *fn_copy = strdup(function_name);
72	if (fn_copy == NULL)
73		goto fail;
74
75	if (DICT_INSERT(name_cache, &fn_copy, &tmp) < 0) {
76		free((char *)fn_copy);
77		goto fail;
78	}
79
80	return tmp;
81}
82
83#endif
84