1 /* Helper functions for form handling. 2 Copyright (C) 2003-2009 Red Hat, Inc. 3 This file is part of Red Hat elfutils. 4 Written by Ulrich Drepper <drepper (at) 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 <dwarf.h> 56 #include <string.h> 57 58 #include "libdwP.h" 59 60 61 size_t 62 internal_function 63 __libdw_form_val_len (Dwarf *dbg, struct Dwarf_CU *cu, unsigned int form, 64 const unsigned char *valp) 65 { 66 const unsigned char *saved; 67 Dwarf_Word u128; 68 size_t result; 69 70 switch (form) 71 { 72 case DW_FORM_addr: 73 result = cu->address_size; 74 break; 75 76 case DW_FORM_ref_addr: 77 result = cu->version == 2 ? cu->address_size : cu->offset_size; 78 break; 79 80 case DW_FORM_strp: 81 case DW_FORM_sec_offset: 82 result = cu->offset_size; 83 break; 84 85 case DW_FORM_block1: 86 result = *valp + 1; 87 break; 88 89 case DW_FORM_block2: 90 result = read_2ubyte_unaligned (dbg, valp) + 2; 91 break; 92 93 case DW_FORM_block4: 94 result = read_4ubyte_unaligned (dbg, valp) + 4; 95 break; 96 97 case DW_FORM_block: 98 case DW_FORM_exprloc: 99 saved = valp; 100 get_uleb128 (u128, valp); 101 result = u128 + (valp - saved); 102 break; 103 104 case DW_FORM_flag_present: 105 result = 0; 106 break; 107 108 case DW_FORM_ref1: 109 case DW_FORM_data1: 110 case DW_FORM_flag: 111 result = 1; 112 break; 113 114 case DW_FORM_data2: 115 case DW_FORM_ref2: 116 result = 2; 117 break; 118 119 case DW_FORM_data4: 120 case DW_FORM_ref4: 121 result = 4; 122 break; 123 124 case DW_FORM_data8: 125 case DW_FORM_ref8: 126 case DW_FORM_ref_sig8: 127 result = 8; 128 break; 129 130 case DW_FORM_string: 131 result = strlen ((char *) valp) + 1; 132 break; 133 134 case DW_FORM_sdata: 135 case DW_FORM_udata: 136 case DW_FORM_ref_udata: 137 saved = valp; 138 get_uleb128 (u128, valp); 139 result = valp - saved; 140 break; 141 142 case DW_FORM_indirect: 143 saved = valp; 144 get_uleb128 (u128, valp); 145 // XXX Is this really correct? 146 result = __libdw_form_val_len (dbg, cu, u128, valp); 147 if (result != (size_t) -1) 148 result += valp - saved; 149 break; 150 151 default: 152 __libdw_seterrno (DWARF_E_INVALID_DWARF); 153 result = (size_t) -1l; 154 break; 155 } 156 157 return result; 158 } 159
