1 /* Return tag of given DIE.
2 Copyright (C) 2003-2011 Red Hat, Inc.
3 This file is part of elfutils.
4 Written by Ulrich Drepper <drepper@redhat.com>, 2003.
6 This file is free software; you can redistribute it and/or modify
7 it under the terms of either
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
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
19 or both in parallel, as here.
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.
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/>. */
39 __libdw_findabbrev (struct Dwarf_CU *cu, unsigned int code)
43 /* Abbreviation code can never have a value of 0. */
44 if (unlikely (code == 0))
45 return DWARF_END_ABBREV;
47 /* See whether the entry is already in the hash table. */
48 abb = Dwarf_Abbrev_Hash_find (&cu->abbrev_hash, code, NULL);
50 while (cu->last_abbrev_offset != (size_t) -1l)
54 /* Find the next entry. It gets automatically added to the
56 abb = __libdw_getabbrev (cu->dbg, cu, cu->last_abbrev_offset, &length,
58 if (abb == NULL || abb == DWARF_END_ABBREV)
60 /* Make sure we do not try to search for it again. */
61 cu->last_abbrev_offset = (size_t) -1l;
62 return DWARF_END_ABBREV;
65 cu->last_abbrev_offset += length;
67 /* Is this the code we are looking for? */
68 if (abb->code == code)
72 /* This is our second (or third, etc.) call to __libdw_findabbrev
73 and the code is invalid. */
74 if (unlikely (abb == NULL))
75 abb = DWARF_END_ABBREV;
85 /* Do we already know the abbreviation? */
86 if (die->abbrev == NULL)
88 /* Get the abbreviation code. */
90 const unsigned char *addr = die->addr;
91 get_uleb128 (u128, addr);
93 /* Find the abbreviation. */
94 die->abbrev = __libdw_findabbrev (die->cu, u128);
97 if (unlikely (die->abbrev == DWARF_END_ABBREV))
99 __libdw_seterrno (DWARF_E_INVALID_DWARF);
100 return DW_TAG_invalid;
103 return die->abbrev->tag;