mirror of
https://github.com/autc04/Retro68.git
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120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/* Look up the DIE in a reference-form attribute.
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Copyright (C) 2005-2010 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <string.h>
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#include "libdwP.h"
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#include <dwarf.h>
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Dwarf_Die *
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dwarf_formref_die (Dwarf_Attribute *attr, Dwarf_Die *result)
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{
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if (attr == NULL)
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return NULL;
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struct Dwarf_CU *cu = attr->cu;
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Dwarf_Off offset;
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if (attr->form == DW_FORM_ref_addr || attr->form == DW_FORM_GNU_ref_alt)
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{
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/* This has an absolute offset. */
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uint8_t ref_size = (cu->version == 2 && attr->form == DW_FORM_ref_addr
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? cu->address_size
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: cu->offset_size);
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Dwarf *dbg_ret = (attr->form == DW_FORM_GNU_ref_alt
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? cu->dbg->alt_dwarf : cu->dbg);
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if (dbg_ret == NULL)
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{
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__libdw_seterrno (DWARF_E_NO_ALT_DEBUGLINK);
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return NULL;
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}
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if (__libdw_read_offset (cu->dbg, dbg_ret, IDX_debug_info, attr->valp,
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ref_size, &offset, IDX_debug_info, 0))
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return NULL;
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return INTUSE(dwarf_offdie) (dbg_ret, offset, result);
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}
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const unsigned char *datap;
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size_t size;
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if (attr->form == DW_FORM_ref_sig8)
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{
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/* This doesn't have an offset, but instead a value we
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have to match in the .debug_types type unit headers. */
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uint64_t sig = read_8ubyte_unaligned (cu->dbg, attr->valp);
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cu = Dwarf_Sig8_Hash_find (&cu->dbg->sig8_hash, sig, NULL);
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if (cu == NULL)
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/* Not seen before. We have to scan through the type units. */
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do
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{
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cu = __libdw_intern_next_unit (attr->cu->dbg, true);
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if (cu == NULL)
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{
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__libdw_seterrno (INTUSE(dwarf_errno) ()
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?: DWARF_E_INVALID_REFERENCE);
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return NULL;
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}
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}
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while (cu->type_sig8 != sig);
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datap = cu->dbg->sectiondata[IDX_debug_types]->d_buf;
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size = cu->dbg->sectiondata[IDX_debug_types]->d_size;
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offset = cu->start + cu->type_offset;
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}
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else
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{
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/* Other forms produce an offset from the CU. */
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if (unlikely (__libdw_formref (attr, &offset) != 0))
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return NULL;
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datap = cu->startp;
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size = cu->endp - cu->startp;
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}
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if (unlikely (offset >= size))
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{
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__libdw_seterrno (DWARF_E_INVALID_DWARF);
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return NULL;
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}
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memset (result, '\0', sizeof (Dwarf_Die));
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result->addr = (char *) datap + offset;
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result->cu = cu;
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return result;
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}
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INTDEF (dwarf_formref_die)
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