Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 1 | /* Return tag of given DIE. |
| 2 | Copyright (C) 2003-2011 Red Hat, Inc. |
| 3 | This file is part of Red Hat elfutils. |
| 4 | Written by Ulrich Drepper <drepper@redhat.com>, 2003. |
| 5 | |
| 6 | Red Hat elfutils is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by the |
| 8 | Free Software Foundation; version 2 of the License. |
| 9 | |
| 10 | Red Hat elfutils is distributed in the hope that it will be useful, but |
| 11 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License along |
| 16 | with Red Hat elfutils; if not, write to the Free Software Foundation, |
| 17 | Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. |
| 18 | |
| 19 | In addition, as a special exception, Red Hat, Inc. gives You the |
| 20 | additional right to link the code of Red Hat elfutils with code licensed |
| 21 | under any Open Source Initiative certified open source license |
| 22 | (http://www.opensource.org/licenses/index.php) which requires the |
| 23 | distribution of source code with any binary distribution and to |
| 24 | distribute linked combinations of the two. Non-GPL Code permitted under |
| 25 | this exception must only link to the code of Red Hat elfutils through |
| 26 | those well defined interfaces identified in the file named EXCEPTION |
| 27 | found in the source code files (the "Approved Interfaces"). The files |
| 28 | of Non-GPL Code may instantiate templates or use macros or inline |
| 29 | functions from the Approved Interfaces without causing the resulting |
| 30 | work to be covered by the GNU General Public License. Only Red Hat, |
| 31 | Inc. may make changes or additions to the list of Approved Interfaces. |
| 32 | Red Hat's grant of this exception is conditioned upon your not adding |
| 33 | any new exceptions. If you wish to add a new Approved Interface or |
| 34 | exception, please contact Red Hat. You must obey the GNU General Public |
| 35 | License in all respects for all of the Red Hat elfutils code and other |
| 36 | code used in conjunction with Red Hat elfutils except the Non-GPL Code |
| 37 | covered by this exception. If you modify this file, you may extend this |
| 38 | exception to your version of the file, but you are not obligated to do |
| 39 | so. If you do not wish to provide this exception without modification, |
| 40 | you must delete this exception statement from your version and license |
| 41 | this file solely under the GPL without exception. |
| 42 | |
| 43 | Red Hat elfutils is an included package of the Open Invention Network. |
| 44 | An included package of the Open Invention Network is a package for which |
| 45 | Open Invention Network licensees cross-license their patents. No patent |
| 46 | license is granted, either expressly or impliedly, by designation as an |
| 47 | included package. Should you wish to participate in the Open Invention |
| 48 | Network licensing program, please visit www.openinventionnetwork.com |
| 49 | <http://www.openinventionnetwork.com>. */ |
| 50 | |
| 51 | #ifdef HAVE_CONFIG_H |
| 52 | # include <config.h> |
| 53 | #endif |
| 54 | |
| 55 | #include "libdwP.h" |
| 56 | |
| 57 | |
| 58 | Dwarf_Abbrev * |
| 59 | internal_function |
| 60 | __libdw_findabbrev (struct Dwarf_CU *cu, unsigned int code) |
| 61 | { |
| 62 | Dwarf_Abbrev *abb; |
| 63 | |
| 64 | /* Abbreviation code can never have a value of 0. */ |
| 65 | if (unlikely (code == 0)) |
| 66 | return DWARF_END_ABBREV; |
| 67 | |
| 68 | /* See whether the entry is already in the hash table. */ |
| 69 | abb = Dwarf_Abbrev_Hash_find (&cu->abbrev_hash, code, NULL); |
| 70 | if (abb == NULL) |
| 71 | while (cu->last_abbrev_offset != (size_t) -1l) |
| 72 | { |
| 73 | size_t length; |
| 74 | |
| 75 | /* Find the next entry. It gets automatically added to the |
| 76 | hash table. */ |
| 77 | abb = __libdw_getabbrev (cu->dbg, cu, cu->last_abbrev_offset, &length, |
| 78 | NULL); |
| 79 | if (abb == NULL || abb == DWARF_END_ABBREV) |
| 80 | { |
| 81 | /* Make sure we do not try to search for it again. */ |
| 82 | cu->last_abbrev_offset = (size_t) -1l; |
| 83 | return DWARF_END_ABBREV; |
| 84 | } |
| 85 | |
| 86 | cu->last_abbrev_offset += length; |
| 87 | |
| 88 | /* Is this the code we are looking for? */ |
| 89 | if (abb->code == code) |
| 90 | break; |
| 91 | } |
| 92 | |
| 93 | /* This is our second (or third, etc.) call to __libdw_findabbrev |
| 94 | and the code is invalid. */ |
| 95 | if (unlikely (abb == NULL)) |
| 96 | abb = DWARF_END_ABBREV; |
| 97 | |
| 98 | return abb; |
| 99 | } |
| 100 | |
| 101 | |
| 102 | int |
| 103 | dwarf_tag (die) |
| 104 | Dwarf_Die *die; |
| 105 | { |
| 106 | /* Do we already know the abbreviation? */ |
| 107 | if (die->abbrev == NULL) |
| 108 | { |
| 109 | /* Get the abbreviation code. */ |
| 110 | unsigned int u128; |
| 111 | const unsigned char *addr = die->addr; |
| 112 | get_uleb128 (u128, addr); |
| 113 | |
| 114 | /* Find the abbreviation. */ |
| 115 | die->abbrev = __libdw_findabbrev (die->cu, u128); |
| 116 | } |
| 117 | |
| 118 | if (unlikely (die->abbrev == DWARF_END_ABBREV)) |
| 119 | { |
| 120 | __libdw_seterrno (DWARF_E_INVALID_DWARF); |
| 121 | return DW_TAG_invalid; |
| 122 | } |
| 123 | |
| 124 | return die->abbrev->tag; |
| 125 | } |
| 126 | INTDEF(dwarf_tag) |