481 lines
11 KiB
C
481 lines
11 KiB
C
/*-
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* Copyright (c) 2007 John Birrell (jb@freebsd.org)
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* Copyright (c) 2009,2010 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_form.c 2073 2011-10-27 03:30:47Z jkoshy $");
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int
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dwarf_hasform(Dwarf_Attribute at, Dwarf_Half form, Dwarf_Bool *return_hasform,
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Dwarf_Error *error)
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{
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Dwarf_Debug dbg;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || return_hasform == 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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*return_hasform = (at->at_form == form);
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return (DW_DLV_OK);
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}
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int
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dwarf_whatform(Dwarf_Attribute at, Dwarf_Half *return_form, Dwarf_Error *error)
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{
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Dwarf_Debug dbg;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || return_form == 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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*return_form = at->at_form;
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return (DW_DLV_OK);
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}
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int
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dwarf_whatform_direct(Dwarf_Attribute at, Dwarf_Half *return_form,
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Dwarf_Error *error)
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{
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Dwarf_Debug dbg;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || return_form == 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 (at->at_indirect)
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*return_form = DW_FORM_indirect;
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else
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*return_form = (Dwarf_Half) at->at_form;
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return (DW_DLV_OK);
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}
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int
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dwarf_whatattr(Dwarf_Attribute at, Dwarf_Half *return_attr, Dwarf_Error *error)
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{
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Dwarf_Debug dbg;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || return_attr == 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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*return_attr = (Dwarf_Half) at->at_attrib;
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return (DW_DLV_OK);
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}
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int
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dwarf_formref(Dwarf_Attribute at, Dwarf_Off *return_offset, Dwarf_Error *error)
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{
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int ret;
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Dwarf_Debug dbg;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || return_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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switch (at->at_form) {
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case DW_FORM_ref1:
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case DW_FORM_ref2:
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case DW_FORM_ref4:
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case DW_FORM_ref8:
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case DW_FORM_ref_udata:
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*return_offset = (Dwarf_Off) at->u[0].u64;
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ret = DW_DLV_OK;
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break;
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default:
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DWARF_SET_ERROR(dbg, error, DW_DLE_ATTR_FORM_BAD);
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ret = DW_DLV_ERROR;
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}
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return (ret);
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}
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int
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dwarf_global_formref(Dwarf_Attribute at, Dwarf_Off *return_offset,
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Dwarf_Error *error)
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{
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int ret;
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Dwarf_Debug dbg;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || return_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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switch (at->at_form) {
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case DW_FORM_ref_addr:
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case DW_FORM_sec_offset:
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*return_offset = (Dwarf_Off) at->u[0].u64;
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ret = DW_DLV_OK;
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break;
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case DW_FORM_ref1:
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case DW_FORM_ref2:
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case DW_FORM_ref4:
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case DW_FORM_ref8:
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case DW_FORM_ref_udata:
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*return_offset = (Dwarf_Off) at->u[0].u64 +
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at->at_die->die_cu->cu_offset;
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ret = DW_DLV_OK;
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break;
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default:
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DWARF_SET_ERROR(dbg, error, DW_DLE_ATTR_FORM_BAD);
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ret = DW_DLV_ERROR;
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}
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return (ret);
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}
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int
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dwarf_formaddr(Dwarf_Attribute at, Dwarf_Addr *return_addr, Dwarf_Error *error)
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{
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int ret;
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Dwarf_Debug dbg;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || return_addr == 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 (at->at_form == DW_FORM_addr) {
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*return_addr = at->u[0].u64;
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ret = DW_DLV_OK;
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} else {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ATTR_FORM_BAD);
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ret = DW_DLV_ERROR;
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}
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return (ret);
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}
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int
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dwarf_formflag(Dwarf_Attribute at, Dwarf_Bool *return_bool, Dwarf_Error *error)
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{
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int ret;
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Dwarf_Debug dbg;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || return_bool == 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 (at->at_form == DW_FORM_flag ||
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at->at_form == DW_FORM_flag_present) {
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*return_bool = (Dwarf_Bool) (!!at->u[0].u64);
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ret = DW_DLV_OK;
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} else {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ATTR_FORM_BAD);
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ret = DW_DLV_ERROR;
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}
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return (ret);
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}
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int
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dwarf_formudata(Dwarf_Attribute at, Dwarf_Unsigned *return_uvalue,
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Dwarf_Error *error)
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{
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int ret;
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Dwarf_Debug dbg;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || return_uvalue == 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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switch (at->at_form) {
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case DW_FORM_data1:
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case DW_FORM_data2:
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case DW_FORM_data4:
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case DW_FORM_data8:
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case DW_FORM_udata:
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*return_uvalue = at->u[0].u64;
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ret = DW_DLV_OK;
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break;
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default:
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DWARF_SET_ERROR(dbg, error, DW_DLE_ATTR_FORM_BAD);
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ret = DW_DLV_ERROR;
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}
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return (ret);
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}
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int
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dwarf_formsdata(Dwarf_Attribute at, Dwarf_Signed *return_svalue,
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Dwarf_Error *error)
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{
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int ret;
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Dwarf_Debug dbg;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || return_svalue == 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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switch (at->at_form) {
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case DW_FORM_data1:
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*return_svalue = (int8_t) at->u[0].s64;
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ret = DW_DLV_OK;
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break;
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case DW_FORM_data2:
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*return_svalue = (int16_t) at->u[0].s64;
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ret = DW_DLV_OK;
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break;
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case DW_FORM_data4:
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*return_svalue = (int32_t) at->u[0].s64;
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ret = DW_DLV_OK;
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break;
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case DW_FORM_data8:
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case DW_FORM_sdata:
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*return_svalue = at->u[0].s64;
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ret = DW_DLV_OK;
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break;
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default:
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DWARF_SET_ERROR(dbg, error, DW_DLE_ATTR_FORM_BAD);
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ret = DW_DLV_ERROR;
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}
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return (ret);
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}
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int
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dwarf_formblock(Dwarf_Attribute at, Dwarf_Block **return_block,
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Dwarf_Error *error)
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{
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int ret;
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Dwarf_Debug dbg;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || return_block == 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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switch (at->at_form) {
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case DW_FORM_block:
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case DW_FORM_block1:
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case DW_FORM_block2:
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case DW_FORM_block4:
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*return_block = &at->at_block;
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ret = DW_DLV_OK;
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break;
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default:
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DWARF_SET_ERROR(dbg, error, DW_DLE_ATTR_FORM_BAD);
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ret = DW_DLV_ERROR;
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}
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return (ret);
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}
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int
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dwarf_formsig8(Dwarf_Attribute at, Dwarf_Sig8 *return_sig8, Dwarf_Error *error)
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{
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Dwarf_Debug dbg;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || return_sig8 == 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 (at->at_form != DW_FORM_ref_sig8) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ATTR_FORM_BAD);
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return (DW_DLV_ERROR);
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}
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assert(at->u[0].u64 == 8);
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memcpy(return_sig8->signature, at->u[1].u8p, at->u[0].u64);
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return (DW_DLV_OK);
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}
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int
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dwarf_formexprloc(Dwarf_Attribute at, Dwarf_Unsigned *return_exprlen,
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Dwarf_Ptr *return_expr, Dwarf_Error *error)
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{
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Dwarf_Debug dbg;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || return_exprlen == NULL || return_expr == 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 (at->at_form != DW_FORM_exprloc) {
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DWARF_SET_ERROR(dbg, error, DW_DLE_ATTR_FORM_BAD);
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return (DW_DLV_ERROR);
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}
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*return_exprlen = at->u[0].u64;
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*return_expr = (void *) at->u[1].u8p;
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return (DW_DLV_OK);
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}
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int
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dwarf_formstring(Dwarf_Attribute at, char **return_string,
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Dwarf_Error *error)
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{
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int ret;
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Dwarf_Debug dbg;
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dbg = at != NULL ? at->at_die->die_dbg : NULL;
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if (at == NULL || return_string == 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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switch (at->at_form) {
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case DW_FORM_string:
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*return_string = (char *) at->u[0].s;
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ret = DW_DLV_OK;
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break;
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case DW_FORM_strp:
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*return_string = (char *) at->u[1].s;
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ret = DW_DLV_OK;
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break;
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default:
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DWARF_SET_ERROR(dbg, error, DW_DLE_ATTR_FORM_BAD);
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ret = DW_DLV_ERROR;
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}
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return (ret);
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}
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enum Dwarf_Form_Class
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dwarf_get_form_class(Dwarf_Half dwversion, Dwarf_Half attr,
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Dwarf_Half offset_size, Dwarf_Half form)
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{
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switch (form) {
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case DW_FORM_addr:
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return (DW_FORM_CLASS_ADDRESS);
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case DW_FORM_block:
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case DW_FORM_block1:
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case DW_FORM_block2:
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case DW_FORM_block4:
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return (DW_FORM_CLASS_BLOCK);
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case DW_FORM_string:
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case DW_FORM_strp:
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return (DW_FORM_CLASS_STRING);
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case DW_FORM_flag:
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case DW_FORM_flag_present:
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return (DW_FORM_CLASS_FLAG);
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case DW_FORM_ref_addr:
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case DW_FORM_ref_sig8:
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case DW_FORM_ref_udata:
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case DW_FORM_ref1:
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case DW_FORM_ref2:
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case DW_FORM_ref4:
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case DW_FORM_ref8:
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return (DW_FORM_CLASS_REFERENCE);
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case DW_FORM_exprloc:
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return (DW_FORM_CLASS_EXPRLOC);
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case DW_FORM_data1:
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case DW_FORM_data2:
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case DW_FORM_sdata:
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case DW_FORM_udata:
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return (DW_FORM_CLASS_CONSTANT);
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case DW_FORM_data4:
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case DW_FORM_data8:
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if (dwversion > 3)
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return (DW_FORM_CLASS_CONSTANT);
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if (form == DW_FORM_data4 && offset_size != 4)
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return (DW_FORM_CLASS_CONSTANT);
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if (form == DW_FORM_data8 && offset_size != 8)
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return (DW_FORM_CLASS_CONSTANT);
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/* FALLTHROUGH */
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case DW_FORM_sec_offset:
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/*
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* DW_FORM_data4 and DW_FORM_data8 can be used as
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* offset/pointer before DWARF4. Newly added
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* DWARF4 form DW_FORM_sec_offset intents to replace
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* DW_FORM_data{4,8} for this purpose. Anyway, to
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* determine the actual class for these forms, we need
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* to also look at the attribute number.
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*/
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switch (attr) {
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case DW_AT_location:
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case DW_AT_string_length:
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case DW_AT_return_addr:
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case DW_AT_data_member_location:
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case DW_AT_frame_base:
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case DW_AT_segment:
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case DW_AT_static_link:
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case DW_AT_use_location:
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case DW_AT_vtable_elem_location:
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return (DW_FORM_CLASS_LOCLISTPTR);
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case DW_AT_stmt_list:
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return (DW_FORM_CLASS_LINEPTR);
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case DW_AT_start_scope:
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case DW_AT_ranges:
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return (DW_FORM_CLASS_RANGELISTPTR);
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case DW_AT_macro_info:
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return (DW_FORM_CLASS_MACPTR);
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default:
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if (form == DW_FORM_data4 || form == DW_FORM_data8)
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return (DW_FORM_CLASS_CONSTANT);
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else
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return (DW_FORM_CLASS_UNKNOWN);
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}
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default:
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return (DW_FORM_CLASS_UNKNOWN);
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}
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}
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