diff options
Diffstat (limited to 'src/libdw/dwarf_formudata.c')
| -rw-r--r-- | src/libdw/dwarf_formudata.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/src/libdw/dwarf_formudata.c b/src/libdw/dwarf_formudata.c new file mode 100644 index 00000000..07efbe0b --- /dev/null +++ b/src/libdw/dwarf_formudata.c @@ -0,0 +1,233 @@ +/* Return unsigned constant represented by attribute. + Copyright (C) 2003-2012 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 "libdwP.h" + +internal_function unsigned char * +__libdw_formptr (Dwarf_Attribute *attr, int sec_index, + int err_nodata, unsigned char **endpp, + Dwarf_Off *offsetp) +{ + if (attr == NULL) + return NULL; + + const Elf_Data *d = attr->cu->dbg->sectiondata[sec_index]; + if (unlikely (d == NULL)) + { + __libdw_seterrno (err_nodata); + return NULL; + } + + Dwarf_Word offset; + if (attr->form == DW_FORM_sec_offset) + { + if (__libdw_read_offset (attr->cu->dbg, cu_sec_idx (attr->cu), attr->valp, + attr->cu->offset_size, &offset, sec_index, 0)) + return NULL; + } + else if (attr->cu->version > 3) + goto invalid; + else + switch (attr->form) + { + case DW_FORM_data4: + case DW_FORM_data8: + if (__libdw_read_offset (attr->cu->dbg, cu_sec_idx (attr->cu), + attr->valp, + attr->form == DW_FORM_data4 ? 4 : 8, + &offset, sec_index, 0)) + return NULL; + break; + + default: + if (INTUSE(dwarf_formudata) (attr, &offset)) + return NULL; + }; + + unsigned char *readp = d->d_buf + offset; + unsigned char *endp = d->d_buf + d->d_size; + if (unlikely (readp >= endp)) + { + invalid: + __libdw_seterrno (DWARF_E_INVALID_DWARF); + return NULL; + } + + if (endpp != NULL) + *endpp = endp; + if (offsetp != NULL) + *offsetp = offset; + return readp; +} + +int +dwarf_formudata (attr, return_uval) + Dwarf_Attribute *attr; + Dwarf_Word *return_uval; +{ + if (attr == NULL) + return -1; + + const unsigned char *datap; + + switch (attr->form) + { + case DW_FORM_data1: + *return_uval = *attr->valp; + break; + + case DW_FORM_data2: + *return_uval = read_2ubyte_unaligned (attr->cu->dbg, attr->valp); + break; + + case DW_FORM_data4: + case DW_FORM_data8: + case DW_FORM_sec_offset: + /* Before DWARF4 data4 and data8 are pure constants unless the + attribute also allows offsets (*ptr classes), since DWARF4 + they are always just constants (start_scope is special though, + since it only could express a rangelist since DWARF4). */ + if (attr->form == DW_FORM_sec_offset + || (attr->cu->version < 4 && attr->code != DW_AT_start_scope)) + { + switch (attr->code) + { + case DW_AT_data_member_location: + case DW_AT_frame_base: + case DW_AT_location: + case DW_AT_return_addr: + case DW_AT_segment: + case DW_AT_static_link: + case DW_AT_string_length: + case DW_AT_use_location: + case DW_AT_vtable_elem_location: + /* loclistptr */ + if (__libdw_formptr (attr, IDX_debug_loc, + DWARF_E_NO_LOCLIST, NULL, + return_uval) == NULL) + return -1; + break; + + case DW_AT_macro_info: + /* macptr */ + if (__libdw_formptr (attr, IDX_debug_macinfo, + DWARF_E_NO_ENTRY, NULL, + return_uval) == NULL) + return -1; + break; + + case DW_AT_ranges: + case DW_AT_start_scope: + /* rangelistptr */ + if (__libdw_formptr (attr, IDX_debug_ranges, + DWARF_E_NO_DEBUG_RANGES, NULL, + return_uval) == NULL) + return -1; + break; + + case DW_AT_stmt_list: + /* lineptr */ + if (__libdw_formptr (attr, IDX_debug_line, + DWARF_E_NO_DEBUG_LINE, NULL, + return_uval) == NULL) + return -1; + break; + + default: + /* sec_offset can only be used by one of the above attrs. */ + if (attr->form == DW_FORM_sec_offset) + { + __libdw_seterrno (DWARF_E_INVALID_DWARF); + return -1; + } + + /* Not one of the special attributes, just a constant. */ + if (__libdw_read_address (attr->cu->dbg, cu_sec_idx (attr->cu), + attr->valp, + attr->form == DW_FORM_data4 ? 4 : 8, + return_uval)) + return -1; + break; + } + } + else + { + /* We are dealing with a constant data4 or data8. */ + if (__libdw_read_address (attr->cu->dbg, cu_sec_idx (attr->cu), + attr->valp, + attr->form == DW_FORM_data4 ? 4 : 8, + return_uval)) + return -1; + } + break; + + case DW_FORM_sdata: + datap = attr->valp; + get_sleb128 (*return_uval, datap); + break; + + case DW_FORM_udata: + datap = attr->valp; + get_uleb128 (*return_uval, datap); + break; + + default: + __libdw_seterrno (DWARF_E_NO_CONSTANT); + return -1; + } + + return 0; +} +INTDEF(dwarf_formudata) |