1 /* Return DIE at given offset.
2 Copyright (C) 2002-2010 Red Hat, Inc.
3 This file is part of elfutils.
4 Written by Ulrich Drepper <drepper@redhat.com>, 2002.
5
6 This file is free software; you can redistribute it and/or modify
7 it under the terms of either
8
9 * the GNU Lesser General Public License as published by the Free
10 Software Foundation; either version 3 of the License, or (at
11 your option) any later version
12
13 or
14
15 * the GNU General Public License as published by the Free
16 Software Foundation; either version 2 of the License, or (at
17 your option) any later version
18
19 or both in parallel, as here.
20
21 elfutils is distributed in the hope that it will be useful, but
22 WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 General Public License for more details.
25
26 You should have received copies of the GNU General Public License and
27 the GNU Lesser General Public License along with this program. If
28 not, see <http://www.gnu.org/licenses/>. */
29
30 #ifdef HAVE_CONFIG_H
31 # include <config.h>
32 #endif
33
34 #include <string.h>
35 #include "libdwP.h"
36
37
38 Dwarf_Die *
39 internal_function
__libdw_offdie(Dwarf * dbg,Dwarf_Off offset,Dwarf_Die * result,bool debug_types)40 __libdw_offdie (Dwarf *dbg, Dwarf_Off offset, Dwarf_Die *result,
41 bool debug_types)
42 {
43 if (dbg == NULL)
44 return NULL;
45
46 Elf_Data *const data = dbg->sectiondata[debug_types ? IDX_debug_types
47 : IDX_debug_info];
48 if (offset >= data->d_size)
49 {
50 __libdw_seterrno (DWARF_E_INVALID_DWARF);
51 return NULL;
52 }
53
54 /* Clear the entire DIE structure. This signals we have not yet
55 determined any of the information. */
56 memset (result, '\0', sizeof (Dwarf_Die));
57
58 result->addr = (char *) data->d_buf + offset;
59
60 /* Get the CU. */
61 result->cu = __libdw_findcu (dbg, offset, debug_types);
62 if (result->cu == NULL)
63 {
64 /* This should never happen. The input file is malformed. */
65 __libdw_seterrno (DWARF_E_INVALID_DWARF);
66 result = NULL;
67 }
68
69 return result;
70 }
71
72
73 Dwarf_Die *
dwarf_offdie(Dwarf * dbg,Dwarf_Off offset,Dwarf_Die * result)74 dwarf_offdie (Dwarf *dbg, Dwarf_Off offset, Dwarf_Die *result)
75 {
76 return __libdw_offdie (dbg, offset, result, false);
77 }
INTDEF(dwarf_offdie)78 INTDEF(dwarf_offdie)
79
80 Dwarf_Die *
81 dwarf_offdie_types (Dwarf *dbg, Dwarf_Off offset, Dwarf_Die *result)
82 {
83 return __libdw_offdie (dbg, offset, result, true);
84 }
85