| /* Get macro information. |
| Copyright (C) 2002-2009 Red Hat, Inc. |
| This file is part of Red Hat elfutils. |
| Written by Ulrich Drepper <drepper@redhat.com>, 2002. |
| |
| Red Hat elfutils is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by the |
| Free Software Foundation; version 2 of the License. |
| |
| Red Hat elfutils is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License along |
| with Red Hat elfutils; if not, write to the Free Software Foundation, |
| Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. |
| |
| In addition, as a special exception, Red Hat, Inc. gives You the |
| additional right to link the code of Red Hat elfutils with code licensed |
| under any Open Source Initiative certified open source license |
| (http://www.opensource.org/licenses/index.php) which requires the |
| distribution of source code with any binary distribution and to |
| distribute linked combinations of the two. Non-GPL Code permitted under |
| this exception must only link to the code of Red Hat elfutils through |
| those well defined interfaces identified in the file named EXCEPTION |
| found in the source code files (the "Approved Interfaces"). The files |
| of Non-GPL Code may instantiate templates or use macros or inline |
| functions from the Approved Interfaces without causing the resulting |
| work to be covered by the GNU General Public License. Only Red Hat, |
| Inc. may make changes or additions to the list of Approved Interfaces. |
| Red Hat's grant of this exception is conditioned upon your not adding |
| any new exceptions. If you wish to add a new Approved Interface or |
| exception, please contact Red Hat. You must obey the GNU General Public |
| License in all respects for all of the Red Hat elfutils code and other |
| code used in conjunction with Red Hat elfutils except the Non-GPL Code |
| covered by this exception. If you modify this file, you may extend this |
| exception to your version of the file, but you are not obligated to do |
| so. If you do not wish to provide this exception without modification, |
| you must delete this exception statement from your version and license |
| this file solely under the GPL without exception. |
| |
| Red Hat elfutils is an included package of the Open Invention Network. |
| An included package of the Open Invention Network is a package for which |
| Open Invention Network licensees cross-license their patents. No patent |
| license is granted, either expressly or impliedly, by designation as an |
| included package. Should you wish to participate in the Open Invention |
| Network licensing program, please visit www.openinventionnetwork.com |
| <http://www.openinventionnetwork.com>. */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include <config.h> |
| #endif |
| |
| #include <dwarf.h> |
| #include <string.h> |
| |
| #include <libdwP.h> |
| |
| |
| ptrdiff_t |
| dwarf_getmacros (die, callback, arg, offset) |
| Dwarf_Die *die; |
| int (*callback) (Dwarf_Macro *, void *); |
| void *arg; |
| ptrdiff_t offset; |
| { |
| if (d == NULL) |
| return -1; |
| |
| Elf_Data *d = die->cu->dbg->sectiondata[IDX_debug_macinfo]; |
| if (unlikely (d == NULL) || unlikely (d->d_buf == NULL)) |
| { |
| __libdw_seterrno (DWARF_E_NO_ENTRY); |
| return -1; |
| } |
| |
| if (offset == 0) |
| { |
| /* Get the appropriate attribute. */ |
| Dwarf_Attribute attr; |
| if (INTUSE(dwarf_attr) (die, DW_AT_macro_info, &attr) == NULL) |
| return -1; |
| |
| /* Offset into the .debug_macinfo section. */ |
| Dwarf_Word macoff; |
| if (INTUSE(dwarf_formudata) (&attr, &macoff) != 0) |
| return -1; |
| |
| offset = macoff; |
| } |
| if (unlikely (offset > (ptrdiff_t) d->d_size)) |
| goto invalid; |
| |
| const unsigned char *readp = d->d_buf + offset; |
| const unsigned char *readendp = d->d_buf + d->d_size; |
| |
| if (readp == readendp) |
| return 0; |
| |
| while (readp < readendp) |
| { |
| unsigned int opcode = *readp++; |
| unsigned int u128; |
| unsigned int u128_2 = 0; |
| const char *str = NULL; |
| const unsigned char *endp; |
| |
| switch (opcode) |
| { |
| case DW_MACINFO_define: |
| case DW_MACINFO_undef: |
| case DW_MACINFO_vendor_ext: |
| /* For the first two opcodes the parameters are |
| line, string |
| For the latter |
| number, string. |
| We can treat these cases together. */ |
| get_uleb128 (u128, readp); |
| |
| endp = memchr (readp, '\0', readendp - readp); |
| if (endp == NULL) |
| goto invalid; |
| |
| str = (char *) readp; |
| readp = endp + 1; |
| break; |
| |
| case DW_MACINFO_start_file: |
| /* The two parameters are line and file index. */ |
| get_uleb128 (u128, readp); |
| get_uleb128 (u128_2, readp); |
| break; |
| |
| case DW_MACINFO_end_file: |
| /* No parameters for this one. */ |
| u128 = 0; |
| break; |
| |
| case 0: |
| /* Nothing more to do. */ |
| return 0; |
| |
| default: |
| goto invalid; |
| } |
| |
| Dwarf_Macro mac; |
| mac.opcode = opcode; |
| mac.param1 = u128; |
| if (str == NULL) |
| mac.param2.u = u128_2; |
| else |
| mac.param2.s = str; |
| |
| if (callback (&mac, arg) != DWARF_CB_OK) |
| return readp - (const unsigned char *) d->d_buf; |
| } |
| |
| /* If we come here the termination of the data for the CU is not |
| present. */ |
| invalid: |
| __libdw_seterrno (DWARF_E_INVALID_DWARF); |
| return -1; |
| } |