336 lines
8.0 KiB
C
336 lines
8.0 KiB
C
/*-
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* Copyright (c) 2007 John Birrell (jb@freebsd.org)
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* Copyright (c) 2009,2011 Kai Wang
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "_libdwarf.h"
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ELFTC_VCSID("$Id: dwarf_die.c 2073 2011-10-27 03:30:47Z jkoshy $");
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int
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dwarf_child(Dwarf_Die die, Dwarf_Die *ret_die, Dwarf_Error *error)
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{
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Dwarf_Debug dbg;
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Dwarf_CU cu;
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int ret;
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dbg = die != NULL ? die->die_dbg : NULL;
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if (die == NULL || ret_die == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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if (die->die_ab->ab_children == DW_CHILDREN_no)
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return (DW_DLV_NO_ENTRY);
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dbg = die->die_dbg;
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cu = die->die_cu;
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ret = _dwarf_die_parse(die->die_dbg, dbg->dbg_info_sec, cu,
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cu->cu_dwarf_size, die->die_next_off, cu->cu_next_offset,
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ret_die, 0, error);
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if (ret == DW_DLE_NO_ENTRY) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
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return (DW_DLV_NO_ENTRY);
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} else if (ret != DW_DLE_NONE)
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return (DW_DLV_ERROR);
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return (DW_DLV_OK);
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}
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int
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dwarf_siblingof(Dwarf_Debug dbg, Dwarf_Die die, Dwarf_Die *ret_die,
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Dwarf_Error *error)
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{
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Dwarf_CU cu;
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Dwarf_Attribute at;
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uint64_t offset;
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int ret, search_sibling;
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if (dbg == NULL || ret_die == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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if ((cu = dbg->dbg_cu_current) == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_DIE_NO_CU_CONTEXT);
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return (DW_DLV_ERROR);
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}
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/* Application requests the first DIE in this CU. */
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if (die == NULL)
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return (dwarf_offdie(dbg, cu->cu_1st_offset, ret_die,
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error));
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/*
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* If the DIE doesn't have any children, its sibling sits next
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* right to it.
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*/
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search_sibling = 0;
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if (die->die_ab->ab_children == DW_CHILDREN_no)
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offset = die->die_next_off;
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else {
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/*
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* Look for DW_AT_sibling attribute for the offset of
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* its sibling.
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*/
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if ((at = _dwarf_attr_find(die, DW_AT_sibling)) != NULL) {
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if (at->at_form != DW_FORM_ref_addr)
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offset = at->u[0].u64 + cu->cu_offset;
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else
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offset = at->u[0].u64;
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} else {
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offset = die->die_next_off;
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search_sibling = 1;
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}
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}
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ret = _dwarf_die_parse(die->die_dbg, dbg->dbg_info_sec, cu,
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cu->cu_dwarf_size, offset, cu->cu_next_offset, ret_die,
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search_sibling, error);
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if (ret == DW_DLE_NO_ENTRY) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
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return (DW_DLV_NO_ENTRY);
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} else if (ret != DW_DLE_NONE)
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return (DW_DLV_ERROR);
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return (DW_DLV_OK);
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}
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static int
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_dwarf_search_die_within_cu(Dwarf_Debug dbg, Dwarf_CU cu, Dwarf_Off offset,
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Dwarf_Die *ret_die, Dwarf_Error *error)
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{
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assert(dbg != NULL && cu != NULL && ret_die != NULL);
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return (_dwarf_die_parse(dbg, dbg->dbg_info_sec, cu, cu->cu_dwarf_size,
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offset, cu->cu_next_offset, ret_die, 0, error));
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}
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int
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dwarf_offdie(Dwarf_Debug dbg, Dwarf_Off offset, Dwarf_Die *ret_die,
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Dwarf_Error *error)
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{
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Dwarf_CU cu;
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int ret;
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if (dbg == NULL || ret_die == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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/* First search the current CU. */
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if (dbg->dbg_cu_current != NULL) {
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cu = dbg->dbg_cu_current;
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if (offset > cu->cu_offset && offset < cu->cu_next_offset) {
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ret = _dwarf_search_die_within_cu(dbg, cu, offset,
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ret_die, error);
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if (ret == DW_DLE_NO_ENTRY) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
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return (DW_DLV_NO_ENTRY);
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} else if (ret != DW_DLE_NONE)
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return (DW_DLV_ERROR);
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return (DW_DLV_OK);
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}
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}
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/* Search other CUs. */
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ret = _dwarf_info_load(dbg, 1, error);
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if (ret != DW_DLE_NONE)
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return (DW_DLV_ERROR);
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STAILQ_FOREACH(cu, &dbg->dbg_cu, cu_next) {
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if (offset < cu->cu_offset || offset > cu->cu_next_offset)
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continue;
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ret = _dwarf_search_die_within_cu(dbg, cu, offset,
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ret_die, error);
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if (ret == DW_DLE_NO_ENTRY) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
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return (DW_DLV_NO_ENTRY);
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} else if (ret != DW_DLE_NONE)
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return (DW_DLV_ERROR);
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return (DW_DLV_OK);
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}
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DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
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return (DW_DLV_NO_ENTRY);
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}
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int
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dwarf_tag(Dwarf_Die die, Dwarf_Half *tag, Dwarf_Error *error)
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{
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Dwarf_Debug dbg;
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dbg = die != NULL ? die->die_dbg : NULL;
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if (die == NULL || tag == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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assert(die->die_ab != NULL);
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*tag = (Dwarf_Half) die->die_ab->ab_tag;
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return (DW_DLV_OK);
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}
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int
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dwarf_dieoffset(Dwarf_Die die, Dwarf_Off *ret_offset, Dwarf_Error *error)
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{
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Dwarf_Debug dbg;
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dbg = die != NULL ? die->die_dbg : NULL;
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if (die == NULL || ret_offset == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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*ret_offset = die->die_offset;
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return (DW_DLV_OK);
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}
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int
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dwarf_die_CU_offset(Dwarf_Die die, Dwarf_Off *ret_offset, Dwarf_Error *error)
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{
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Dwarf_Debug dbg;
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Dwarf_CU cu;
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dbg = die != NULL ? die->die_dbg : NULL;
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if (die == NULL || ret_offset == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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cu = die->die_cu;
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assert(cu != NULL);
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*ret_offset = die->die_offset - cu->cu_offset;
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return (DW_DLV_OK);
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}
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int
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dwarf_die_CU_offset_range(Dwarf_Die die, Dwarf_Off *cu_offset,
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Dwarf_Off *cu_length, Dwarf_Error *error)
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{
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Dwarf_Debug dbg;
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Dwarf_CU cu;
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dbg = die != NULL ? die->die_dbg : NULL;
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if (die == NULL || cu_offset == NULL || cu_length == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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cu = die->die_cu;
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assert(cu != NULL);
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*cu_offset = cu->cu_offset;
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*cu_length = cu->cu_length + cu->cu_length_size;
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return (DW_DLV_OK);
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}
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int
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dwarf_diename(Dwarf_Die die, char **ret_name, Dwarf_Error *error)
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{
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Dwarf_Debug dbg;
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dbg = die != NULL ? die->die_dbg : NULL;
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if (die == NULL || ret_name == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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if (die->die_name == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
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return (DW_DLV_NO_ENTRY);
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}
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*ret_name = die->die_name;
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return (DW_DLV_OK);
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}
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int
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dwarf_die_abbrev_code(Dwarf_Die die)
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{
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assert(die != NULL);
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return (die->die_abnum);
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}
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int
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dwarf_get_cu_die_offset_given_cu_header_offset(Dwarf_Debug dbg,
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Dwarf_Off in_cu_header_offset, Dwarf_Off *out_cu_die_offset,
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Dwarf_Error *error)
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{
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Dwarf_CU cu;
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if (dbg == NULL || out_cu_die_offset == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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STAILQ_FOREACH(cu, &dbg->dbg_cu, cu_next) {
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if (cu->cu_offset == in_cu_header_offset) {
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*out_cu_die_offset = cu->cu_1st_offset;
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break;
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}
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}
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if (cu == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
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return (DW_DLV_NO_ENTRY);
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}
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return (DW_DLV_OK);
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}
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int
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dwarf_get_address_size(Dwarf_Debug dbg, Dwarf_Half *addr_size,
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Dwarf_Error *error)
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{
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if (dbg == NULL || addr_size == NULL) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
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return (DW_DLV_ERROR);
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}
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*addr_size = dbg->dbg_pointer_size;
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return (DW_DLV_OK);
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}
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