1 /* Get attributes of the DIE. 2 Copyright (C) 2004, 2005, 2008, 2009 Red Hat, Inc. 3 This file is part of Red Hat elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 2004. 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 ptrdiff_t 59 dwarf_getattrs (Dwarf_Die *die, int (*callback) (Dwarf_Attribute *, void *), 60 void *arg, ptrdiff_t offset) 61 { 62 if (die == NULL) 63 return -1l; 64 65 if (unlikely (offset == 1)) 66 return 1; 67 68 const unsigned char *die_addr = die->addr; 69 70 /* Get the abbreviation code. */ 71 unsigned int u128; 72 get_uleb128 (u128, die_addr); 73 74 if (die->abbrev == NULL) 75 /* Find the abbreviation. */ 76 die->abbrev = __libdw_findabbrev (die->cu, u128); 77 78 if (unlikely (die->abbrev == DWARF_END_ABBREV)) 79 { 80 invalid_dwarf: 81 __libdw_seterrno (DWARF_E_INVALID_DWARF); 82 return -1l; 83 } 84 85 /* This is where the attributes start. */ 86 const unsigned char *attrp = die->abbrev->attrp; 87 const unsigned char *const offset_attrp = die->abbrev->attrp + offset; 88 89 /* Go over the list of attributes. */ 90 Dwarf *dbg = die->cu->dbg; 91 while (1) 92 { 93 /* Are we still in bounds? */ 94 if (unlikely (attrp 95 >= ((unsigned char *) dbg->sectiondata[IDX_debug_abbrev]->d_buf 96 + dbg->sectiondata[IDX_debug_abbrev]->d_size))) 97 goto invalid_dwarf; 98 99 /* Get attribute name and form. */ 100 Dwarf_Attribute attr; 101 const unsigned char *remembered_attrp = attrp; 102 103 // XXX Fix bound checks 104 get_uleb128 (attr.code, attrp); 105 get_uleb128 (attr.form, attrp); 106 107 /* We can stop if we found the attribute with value zero. */ 108 if (attr.code == 0 && attr.form == 0) 109 /* Do not return 0 here - there would be no way to 110 distinguish this value from the attribute at offset 0. 111 Instead we return +1 which would never be a valid 112 offset of an attribute. */ 113 return 1l; 114 115 /* If we are not to OFFSET_ATTRP yet, we just have to skip 116 the values of the intervening attributes. */ 117 if (remembered_attrp >= offset_attrp) 118 { 119 /* Fill in the rest. */ 120 attr.valp = (unsigned char *) die_addr; 121 attr.cu = die->cu; 122 123 /* Now call the callback function. */ 124 if (callback (&attr, arg) != DWARF_CB_OK) 125 /* Return the offset of the start of the attribute, so that 126 dwarf_getattrs() can be restarted from this point if the 127 caller so desires. */ 128 return remembered_attrp - die->abbrev->attrp; 129 } 130 131 /* Skip over the rest of this attribute (if there is any). */ 132 if (attr.form != 0) 133 { 134 size_t len = __libdw_form_val_len (dbg, die->cu, attr.form, 135 die_addr); 136 137 if (unlikely (len == (size_t) -1l)) 138 /* Something wrong with the file. */ 139 return -1l; 140 141 // XXX We need better boundary checks. 142 die_addr += len; 143 } 144 } 145 /* NOTREACHED */ 146 } 147
