diff options
Diffstat (limited to 'libdw/dwarf_formref_die.c')
| -rw-r--r-- | libdw/dwarf_formref_die.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/libdw/dwarf_formref_die.c b/libdw/dwarf_formref_die.c new file mode 100644 index 00000000..90a4b2d3 --- /dev/null +++ b/libdw/dwarf_formref_die.c @@ -0,0 +1,90 @@ +/* Look up the DIE in a reference-form attribute. + Copyright (C) 2005, 2007 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 + 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 "libdwP.h" +#include <dwarf.h> + + +Dwarf_Die * +dwarf_formref_die (attr, die_mem) + Dwarf_Attribute *attr; + Dwarf_Die *die_mem; +{ + if (attr == NULL) + return NULL; + + Dwarf_Off offset; + if (attr->form == DW_FORM_ref_addr) + { + /* This has an absolute offset. */ + + uint8_t ref_size = (attr->cu->version == 2 + ? attr->cu->address_size + : attr->cu->offset_size); + + if (ref_size == 8) + offset = read_8ubyte_unaligned (attr->cu->dbg, attr->valp); + else + offset = read_4ubyte_unaligned (attr->cu->dbg, attr->valp); + } + else + { + /* Other forms produce an offset from the CU. */ + if (unlikely (__libdw_formref (attr, &offset) != 0)) + return NULL; + offset += attr->cu->start; + } + + return INTUSE(dwarf_offdie) (attr->cu->dbg, offset, die_mem); +} +INTDEF (dwarf_formref_die) |