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/* Return child of die.
Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
Written by Ulrich Drepper <drepper@redhat.com>, 2000.
This program is Open Source software; you can redistribute it and/or
modify it under the terms of the Open Software License version 1.0 as
published by the Open Source Initiative.
You should have received a copy of the Open Software License along
with this program; if not, you may obtain a copy of the Open Software
License version 1.0 from http://www.opensource.org/licenses/osl.php or
by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
3001 King Ranch Road, Ukiah, CA 95482. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <libdwarfP.h>
int
dwarf_child (die, return_kid, error)
Dwarf_Die die;
Dwarf_Die *return_kid;
Dwarf_Error *error;
{
Dwarf_Debug dbg = die->cu->dbg;
Dwarf_Abbrev abbrev;
Dwarf_Small *attrp;
Dwarf_Small *die_addr;
Dwarf_Word u128;
Dwarf_Die new_die;
if (! die->abbrev->has_children)
return DW_DLV_NO_ENTRY;
/* Address of the given die. */
die_addr = die->addr;
/* Get abbrev code. */
get_uleb128 (u128, die_addr);
/* And get the abbreviation itself. */
abbrev = __libdwarf_get_abbrev (dbg, die->cu, u128, error);
if (abbrev == NULL)
return DW_DLV_ERROR;
/* This is where the attributes start. */
attrp = abbrev->attrp;
/* Skip over the attributes of the given die. */
while (1)
{
Dwarf_Word attr_name;
Dwarf_Word attr_form;
/* Are we still in bounds? */
if (unlikely (attrp
>= ((Dwarf_Small *)dbg->sections[IDX_debug_abbrev].addr
+ dbg->sections[IDX_debug_abbrev].size)))
{
__libdwarf_error (dbg, error, DW_E_INVALID_DWARF);
return DW_DLV_ERROR;
}
/* Get attribute name and form.
XXX We don't check whether this reads beyond the end of the
section. */
get_uleb128 (attr_name, attrp);
get_uleb128 (attr_form, attrp);
/* We can stop if we found the attribute with value zero. */
if (attr_name == 0 && attr_form == 0)
break;
/* Skip over the rest of this attribute (if there is any). */
if (attr_form != 0)
{
size_t len;
if (unlikely (__libdwarf_form_val_len (dbg, die->cu, attr_form,
die_addr, &len, error)
!= DW_DLV_OK))
return DW_DLV_ERROR;
die_addr += len;
}
}
/* Allocate the die structure for the result. */
new_die = (Dwarf_Die) malloc (sizeof (struct Dwarf_Die_s));
if (new_die == NULL)
{
__libdwarf_error (dbg, error, DW_E_NOMEM);
return DW_DLV_ERROR;
}
#ifdef DWARF_DEBUG
new_die->memtag = DW_DLA_DIE;
#endif
/* Remember the address. */
new_die->addr = die_addr;
/* And the compile unit. */
new_die->cu = die->cu;
/* 7.5.2 Debugging Information Entry
Each debugging information entry begins with an unsigned LEB128
number containing the abbreviation code for the entry. */
get_uleb128 (u128, die_addr);
/* Find the abbreviation. */
new_die->abbrev = __libdwarf_get_abbrev (dbg, die->cu, u128, error);
if (new_die->abbrev == NULL)
return DW_DLV_ERROR;
*return_kid = new_die;
return DW_DLV_OK;
}
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