diff options
Diffstat (limited to 'src/libdw/libdw_form.c')
| -rw-r--r-- | src/libdw/libdw_form.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/src/libdw/libdw_form.c b/src/libdw/libdw_form.c new file mode 100644 index 00000000..219dd793 --- /dev/null +++ b/src/libdw/libdw_form.c @@ -0,0 +1,158 @@ +/* Helper functions for form handling. + Copyright (C) 2003-2009 Red Hat, Inc. + This file is part of Red Hat elfutils. + Written by Ulrich Drepper <drepper@redhat.com>, 2003. + + 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" + + +size_t +internal_function +__libdw_form_val_len (Dwarf *dbg, struct Dwarf_CU *cu, unsigned int form, + const unsigned char *valp) +{ + const unsigned char *saved; + Dwarf_Word u128; + size_t result; + + switch (form) + { + case DW_FORM_addr: + result = cu->address_size; + break; + + case DW_FORM_ref_addr: + result = cu->version == 2 ? cu->address_size : cu->offset_size; + break; + + case DW_FORM_strp: + case DW_FORM_sec_offset: + result = cu->offset_size; + break; + + case DW_FORM_block1: + result = *valp + 1; + break; + + case DW_FORM_block2: + result = read_2ubyte_unaligned (dbg, valp) + 2; + break; + + case DW_FORM_block4: + result = read_4ubyte_unaligned (dbg, valp) + 4; + break; + + case DW_FORM_block: + case DW_FORM_exprloc: + saved = valp; + get_uleb128 (u128, valp); + result = u128 + (valp - saved); + break; + + case DW_FORM_flag_present: + result = 0; + break; + + case DW_FORM_ref1: + case DW_FORM_data1: + case DW_FORM_flag: + result = 1; + break; + + case DW_FORM_data2: + case DW_FORM_ref2: + result = 2; + break; + + case DW_FORM_data4: + case DW_FORM_ref4: + result = 4; + break; + + case DW_FORM_data8: + case DW_FORM_ref8: + case DW_FORM_ref_sig8: + result = 8; + break; + + case DW_FORM_string: + result = strlen ((char *) valp) + 1; + break; + + case DW_FORM_sdata: + case DW_FORM_udata: + case DW_FORM_ref_udata: + saved = valp; + get_uleb128 (u128, valp); + result = valp - saved; + break; + + case DW_FORM_indirect: + saved = valp; + get_uleb128 (u128, valp); + // XXX Is this really correct? + result = __libdw_form_val_len (dbg, cu, u128, valp); + if (result != (size_t) -1) + result += valp - saved; + break; + + default: + __libdw_seterrno (DWARF_E_INVALID_DWARF); + result = (size_t) -1l; + break; + } + + return result; +} |