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author | Elliott Hughes <enh@google.com> | 2015-02-17 20:56:04 +0000 |
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committer | Gerrit Code Review <noreply-gerritcodereview@google.com> | 2015-02-17 20:56:04 +0000 |
commit | b48bfdc826ebdd316d5d8a4ff8f213391f1c710b (patch) | |
tree | 961dfef28571e02a7d969fbba9bb51991086476b /src/libdw/dwarf_formref_die.c | |
parent | 5cb12756f3876faa52b0d4491745fc4c7adbab00 (diff) | |
parent | 41f677100e15f315f638774fbd055e497fc90069 (diff) | |
download | android_external_elfutils-b48bfdc826ebdd316d5d8a4ff8f213391f1c710b.tar.gz android_external_elfutils-b48bfdc826ebdd316d5d8a4ff8f213391f1c710b.tar.bz2 android_external_elfutils-b48bfdc826ebdd316d5d8a4ff8f213391f1c710b.zip |
Merge "Export elfutils headers and lose the version number from the path."
Diffstat (limited to 'src/libdw/dwarf_formref_die.c')
-rw-r--r-- | src/libdw/dwarf_formref_die.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/libdw/dwarf_formref_die.c b/src/libdw/dwarf_formref_die.c new file mode 100644 index 00000000..3ec770d2 --- /dev/null +++ b/src/libdw/dwarf_formref_die.c @@ -0,0 +1,131 @@ +/* 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 + 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 <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) |