1 /* Return tag of given DIE. 2 Copyright (C) 2003-2011, 2014 Red Hat, Inc. 3 This file is part of elfutils. 4 Written by Ulrich Drepper <drepper (at) 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 "libdwP.h" 35 36 37 Dwarf_Abbrev * 38 internal_function 39 __libdw_findabbrev (struct Dwarf_CU *cu, unsigned int code) 40 { 41 Dwarf_Abbrev *abb; 42 43 /* Abbreviation code can never have a value of 0. */ 44 if (unlikely (code == 0)) 45 return DWARF_END_ABBREV; 46 47 /* See whether the entry is already in the hash table. */ 48 abb = Dwarf_Abbrev_Hash_find (&cu->abbrev_hash, code, NULL); 49 if (abb == NULL) 50 while (cu->last_abbrev_offset != (size_t) -1l) 51 { 52 size_t length; 53 54 /* Find the next entry. It gets automatically added to the 55 hash table. */ 56 abb = __libdw_getabbrev (cu->dbg, cu, cu->last_abbrev_offset, &length, 57 NULL); 58 if (abb == NULL || abb == DWARF_END_ABBREV) 59 { 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; 63 } 64 65 cu->last_abbrev_offset += length; 66 67 /* Is this the code we are looking for? */ 68 if (abb->code == code) 69 break; 70 } 71 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; 76 77 return abb; 78 } 79 80 81 int 82 dwarf_tag (Dwarf_Die *die) 83 { 84 /* Find the abbreviation entry. */ 85 Dwarf_Abbrev *abbrevp = __libdw_dieabbrev (die, NULL); 86 if (unlikely (abbrevp == DWARF_END_ABBREV)) 87 { 88 __libdw_seterrno (DWARF_E_INVALID_DWARF); 89 return DW_TAG_invalid; 90 } 91 92 return abbrevp->tag; 93 } 94 INTDEF(dwarf_tag) 95
