Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 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@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 | } |