1/* Check whether given DIE has specific attribute.
2   Copyright (C) 2003, 2005, 2014 Red Hat, Inc.
3   This file is part of elfutils.
4   Written by Ulrich Drepper <drepper@redhat.com>, 2003.
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 <dwarf.h>
35#include "libdwP.h"
36
37
38int
39dwarf_hasattr (Dwarf_Die *die, unsigned int search_name)
40{
41  if (die == NULL)
42    return 0;
43
44  /* Find the abbreviation entry.  */
45  Dwarf_Abbrev *abbrevp = __libdw_dieabbrev (die, NULL);
46  if (unlikely (abbrevp == DWARF_END_ABBREV))
47    {
48    invalid_dwarf:
49      __libdw_seterrno (DWARF_E_INVALID_DWARF);
50      return 0;
51    }
52
53  Dwarf *dbg = die->cu->dbg;
54
55  /* Search the name attribute.  */
56  unsigned char *const endp
57    = ((unsigned char *) dbg->sectiondata[IDX_debug_abbrev]->d_buf
58       + dbg->sectiondata[IDX_debug_abbrev]->d_size);
59
60  const unsigned char *attrp = abbrevp->attrp;
61  while (1)
62    {
63      /* Are we still in bounds?  This test needs to be refined.  */
64      if (unlikely (attrp >= endp))
65	goto invalid_dwarf;
66
67      /* Get attribute name and form.  */
68      unsigned int attr_name;
69      get_uleb128 (attr_name, attrp, endp);
70      unsigned int attr_form;
71      if (unlikely (attrp >= endp))
72	goto invalid_dwarf;
73      get_uleb128 (attr_form, attrp, endp);
74
75      /* We can stop if we found the attribute with value zero.  */
76      if (attr_name == 0 || attr_form == 0)
77	return 0;
78
79      if (attr_name == search_name)
80	return 1;
81    }
82}
83INTDEF (dwarf_hasattr)
84