| /* Look up the DIE in a reference-form attribute. |
| Copyright (C) 2005-2010 Red Hat, Inc. |
| This file is part of Red Hat elfutils. |
| |
| 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 |
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| Network licensing program, please visit www.openinventionnetwork.com |
| <http://www.openinventionnetwork.com>. */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include <config.h> |
| #endif |
| |
| #include <string.h> |
| #include "libdwP.h" |
| #include <dwarf.h> |
| |
| |
| Dwarf_Die * |
| dwarf_formref_die (attr, result) |
| Dwarf_Attribute *attr; |
| Dwarf_Die *result; |
| { |
| if (attr == NULL) |
| return NULL; |
| |
| struct Dwarf_CU *cu = attr->cu; |
| |
| Dwarf_Off offset; |
| if (attr->form == DW_FORM_ref_addr) |
| { |
| /* This has an absolute offset. */ |
| |
| uint8_t ref_size = (cu->version == 2 |
| ? cu->address_size |
| : cu->offset_size); |
| |
| if (__libdw_read_offset (cu->dbg, IDX_debug_info, attr->valp, |
| ref_size, &offset, IDX_debug_info, 0)) |
| return NULL; |
| |
| return INTUSE(dwarf_offdie) (cu->dbg, offset, result); |
| } |
| |
| Elf_Data *data; |
| if (attr->form == DW_FORM_ref_sig8) |
| { |
| /* This doesn't have an offset, but instead a value we |
| have to match in the .debug_types type unit headers. */ |
| |
| uint64_t sig = read_8ubyte_unaligned (cu->dbg, attr->valp); |
| cu = Dwarf_Sig8_Hash_find (&cu->dbg->sig8_hash, sig, NULL); |
| if (cu == NULL) |
| /* Not seen before. We have to scan through the type units. */ |
| do |
| { |
| cu = __libdw_intern_next_unit (attr->cu->dbg, true); |
| if (cu == NULL) |
| { |
| __libdw_seterrno (INTUSE(dwarf_errno) () |
| ?: DWARF_E_INVALID_REFERENCE); |
| return NULL; |
| } |
| Dwarf_Sig8_Hash_insert (&cu->dbg->sig8_hash, cu->type_sig8, cu); |
| } |
| while (cu->type_sig8 != sig); |
| |
| data = cu->dbg->sectiondata[IDX_debug_types]; |
| offset = cu->type_offset; |
| } |
| else |
| { |
| /* Other forms produce an offset from the CU. */ |
| if (unlikely (__libdw_formref (attr, &offset) != 0)) |
| return NULL; |
| |
| data = cu_data (cu); |
| } |
| |
| if (unlikely (data->d_size - cu->start <= offset)) |
| { |
| __libdw_seterrno (DWARF_E_INVALID_DWARF); |
| return NULL; |
| } |
| |
| memset (result, '\0', sizeof (Dwarf_Die)); |
| result->addr = (char *) data->d_buf + cu->start + offset; |
| result->cu = cu; |
| return result; |
| } |
| INTDEF (dwarf_formref_die) |