1 /* Get macro information. 2 Copyright (C) 2002-2009 Red Hat, Inc. 3 This file is part of Red Hat elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 2002. 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 ptrdiff_t 62 dwarf_getmacros (die, callback, arg, offset) 63 Dwarf_Die *die; 64 int (*callback) (Dwarf_Macro *, void *); 65 void *arg; 66 ptrdiff_t offset; 67 { 68 if (die == NULL) 69 return -1; 70 71 Elf_Data *d = die->cu->dbg->sectiondata[IDX_debug_macinfo]; 72 if (unlikely (d == NULL) || unlikely (d->d_buf == NULL)) 73 { 74 __libdw_seterrno (DWARF_E_NO_ENTRY); 75 return -1; 76 } 77 78 if (offset == 0) 79 { 80 /* Get the appropriate attribute. */ 81 Dwarf_Attribute attr; 82 if (INTUSE(dwarf_attr) (die, DW_AT_macro_info, &attr) == NULL) 83 return -1; 84 85 /* Offset into the .debug_macinfo section. */ 86 Dwarf_Word macoff; 87 if (INTUSE(dwarf_formudata) (&attr, &macoff) != 0) 88 return -1; 89 90 offset = macoff; 91 } 92 if (unlikely (offset > (ptrdiff_t) d->d_size)) 93 goto invalid; 94 95 const unsigned char *readp = d->d_buf + offset; 96 const unsigned char *readendp = d->d_buf + d->d_size; 97 98 if (readp == readendp) 99 return 0; 100 101 while (readp < readendp) 102 { 103 unsigned int opcode = *readp++; 104 unsigned int u128; 105 unsigned int u128_2 = 0; 106 const char *str = NULL; 107 const unsigned char *endp; 108 109 switch (opcode) 110 { 111 case DW_MACINFO_define: 112 case DW_MACINFO_undef: 113 case DW_MACINFO_vendor_ext: 114 /* For the first two opcodes the parameters are 115 line, string 116 For the latter 117 number, string. 118 We can treat these cases together. */ 119 get_uleb128 (u128, readp); 120 121 endp = memchr (readp, '\0', readendp - readp); 122 if (endp == NULL) 123 goto invalid; 124 125 str = (char *) readp; 126 readp = endp + 1; 127 break; 128 129 case DW_MACINFO_start_file: 130 /* The two parameters are line and file index. */ 131 get_uleb128 (u128, readp); 132 get_uleb128 (u128_2, readp); 133 break; 134 135 case DW_MACINFO_end_file: 136 /* No parameters for this one. */ 137 u128 = 0; 138 break; 139 140 case 0: 141 /* Nothing more to do. */ 142 return 0; 143 144 default: 145 goto invalid; 146 } 147 148 Dwarf_Macro mac; 149 mac.opcode = opcode; 150 mac.param1 = u128; 151 if (str == NULL) 152 mac.param2.u = u128_2; 153 else 154 mac.param2.s = str; 155 156 if (callback (&mac, arg) != DWARF_CB_OK) 157 return readp - (const unsigned char *) d->d_buf; 158 } 159 160 /* If we come here the termination of the data for the CU is not 161 present. */ 162 invalid: 163 __libdw_seterrno (DWARF_E_INVALID_DWARF); 164 return -1; 165 } 166
