124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
/* Return child of die.
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Copyright (C) 2000, 2001, 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 <stdlib.h>
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#include <libdwarfP.h>
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int
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dwarf_child (die, return_kid, error)
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Dwarf_Die die;
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Dwarf_Die *return_kid;
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Dwarf_Error *error;
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{
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Dwarf_Debug dbg = die->cu->dbg;
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Dwarf_Abbrev abbrev;
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Dwarf_Small *attrp;
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Dwarf_Small *die_addr;
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Dwarf_Word u128;
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Dwarf_Die new_die;
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if (! die->abbrev->has_children)
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return DW_DLV_NO_ENTRY;
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/* Address of the given die. */
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die_addr = die->addr;
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/* Get abbrev code. */
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get_uleb128 (u128, die_addr);
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/* And get the abbreviation itself. */
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abbrev = __libdwarf_get_abbrev (dbg, die->cu, u128, error);
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if (abbrev == NULL)
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return DW_DLV_ERROR;
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/* This is where the attributes start. */
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attrp = abbrev->attrp;
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/* Skip over the attributes of the given die. */
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while (1)
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{
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Dwarf_Word attr_name;
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Dwarf_Word attr_form;
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/* Are we still in bounds? */
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if (unlikely (attrp
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>= ((Dwarf_Small *)dbg->sections[IDX_debug_abbrev].addr
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+ dbg->sections[IDX_debug_abbrev].size)))
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{
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__libdwarf_error (dbg, error, DW_E_INVALID_DWARF);
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return DW_DLV_ERROR;
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}
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/* Get attribute name and form.
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XXX We don't check whether this reads beyond the end of the
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section. */
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get_uleb128 (attr_name, attrp);
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get_uleb128 (attr_form, attrp);
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/* We can stop if we found the attribute with value zero. */
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if (attr_name == 0 && attr_form == 0)
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break;
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/* Skip over the rest of this attribute (if there is any). */
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if (attr_form != 0)
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{
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size_t len;
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if (unlikely (__libdwarf_form_val_len (dbg, die->cu, attr_form,
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die_addr, &len, error)
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!= DW_DLV_OK))
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return DW_DLV_ERROR;
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die_addr += len;
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}
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}
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/* Allocate the die structure for the result. */
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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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new_die->addr = die_addr;
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/* And the compile unit. */
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new_die->cu = die->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, die->cu, u128, error);
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if (new_die->abbrev == NULL)
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return DW_DLV_ERROR;
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*return_kid = new_die;
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return DW_DLV_OK;
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}
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