124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
/* Return die at given offset.
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Copyright (C) 2000, 2002 Red Hat, Inc.
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Written by Ulrich Drepper <drepper@redhat.com>, 2000.
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This program is Open Source software; you can redistribute it and/or
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modify it under the terms of the Open Software License version 1.0 as
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published by the Open Source Initiative.
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You should have received a copy of the Open Software License along
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with this program; if not, you may obtain a copy of the Open Software
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License version 1.0 from http://www.opensource.org/licenses/osl.php or
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by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
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3001 King Ranch Road, Ukiah, CA 95482. */
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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 <dwarf.h>
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#include <stdlib.h>
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#include <libdwarfP.h>
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/* XXX This function will have to be optimized. The search is too linear
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to be performed too often -> O(n²). */
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static Dwarf_CU_Info
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find_cu (Dwarf_Debug dbg, Dwarf_Off offset, Dwarf_Error *error)
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{
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Dwarf_CU_Info cu;
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Dwarf_Word cu_offset;
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/* Search in the CUs already known. */
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for (cu = dbg->cu_list; cu != NULL; cu = cu->next)
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if (cu->offset <= offset
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&& cu->offset + 2 * cu->offset_size - 4 + cu->length > offset)
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return cu;
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/* The CU is not yet loaded. Do this now. */
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if (dbg->cu_list_tail == NULL)
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cu_offset = 0;
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else
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cu_offset = (dbg->cu_list_tail->offset
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+ 2 * dbg->cu_list_tail->offset_size - 4
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+ dbg->cu_list_tail->length);
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while (1)
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{
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/* Get next CU and add it to the end of the list. */
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if (__libdwarf_get_cu_at_offset (dbg, cu_offset, &cu, error)
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!= DW_DLV_OK)
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return NULL;
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/* Offset of next CU. */
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cu_offset += 2 * cu->offset_size - 4 + cu->length;
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/* If this the CU we are looking for? */
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if (offset < cu_offset)
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return cu;
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}
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}
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int
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dwarf_offdie (dbg, offset, return_die, error)
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Dwarf_Debug dbg;
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Dwarf_Off offset;
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Dwarf_Die *return_die;
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Dwarf_Error *error;
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{
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Dwarf_CU_Info cu;
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Dwarf_Die new_die;
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Dwarf_Small *die_addr;
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Dwarf_Word u128;
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if (offset >= dbg->sections[IDX_debug_info].size)
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{
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/* Completely out of bounds. */
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__libdwarf_error (dbg, error, DW_E_INVALID_OFFSET);
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return DW_DLV_ERROR;
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}
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/* Find the compile unit this address belongs to. */
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cu = find_cu (dbg, offset, error);
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if (cu == NULL)
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return DW_DLV_ERROR;
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/* Creata a new die. */
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new_die = (Dwarf_Die) malloc (sizeof (struct Dwarf_Die_s));
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if (new_die == NULL)
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{
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__libdwarf_error (dbg, error, DW_E_NOMEM);
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return DW_DLV_ERROR;
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}
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#ifdef DWARF_DEBUG
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new_die->memtag = DW_DLA_DIE;
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#endif
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/* Remember the address. */
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die_addr = (Dwarf_Small *) dbg->sections[IDX_debug_info].addr + offset;
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new_die->addr = die_addr;
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/* And the compile unit. */
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new_die->cu = cu;
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/* 7.5.2 Debugging Information Entry
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Each debugging information entry begins with an unsigned LEB128
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number containing the abbreviation code for the entry. */
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get_uleb128 (u128, die_addr);
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/* Find the abbreviation. */
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new_die->abbrev = __libdwarf_get_abbrev (dbg, cu, u128, error);
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if (new_die->abbrev == NULL)
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{
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free (new_die);
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return DW_DLV_ERROR;
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}
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*return_die = new_die;
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return DW_DLV_OK;
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}
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