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/* Get attributes of the DIE.
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Copyright (C) 2004, 2005, 2008, 2009, 2014, 2017 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2004.
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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 "libdwP.h"
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ptrdiff_t
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dwarf_getattrs (Dwarf_Die *die, int (*callback) (Dwarf_Attribute *, void *),
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void *arg, ptrdiff_t offset)
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{
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if (die == NULL)
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return -1l;
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if (unlikely (offset == 1))
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return 1;
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const unsigned char *die_addr = NULL;
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/* Find the abbreviation entry. */
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Dwarf_Abbrev *abbrevp = __libdw_dieabbrev (die, &die_addr);
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if (unlikely (abbrevp == DWARF_END_ABBREV))
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{
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__libdw_seterrno (DWARF_E_INVALID_DWARF);
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return -1l;
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}
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/* This is where the attributes start. */
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const unsigned char *attrp = abbrevp->attrp;
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const unsigned char *const offset_attrp = abbrevp->attrp + offset;
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/* Go over the list of attributes. */
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while (1)
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{
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/* Get attribute name and form. Dwarf_Abbrev was checked when
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created, so we can read unchecked. */
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Dwarf_Attribute attr;
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const unsigned char *remembered_attrp = attrp;
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get_uleb128_unchecked (attr.code, attrp);
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get_uleb128_unchecked (attr.form, attrp);
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/* We can stop if we found the attribute with value zero. */
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if (attr.code == 0 && attr.form == 0)
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/* Do not return 0 here - there would be no way to
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distinguish this value from the attribute at offset 0.
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Instead we return +1 which would never be a valid
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offset of an attribute. */
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return 1l;
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/* If we are not to OFFSET_ATTRP yet, we just have to skip
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the values of the intervening attributes. */
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if (remembered_attrp >= offset_attrp)
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{
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/* Fill in the rest. */
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if (attr.form == DW_FORM_implicit_const)
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attr.valp = (unsigned char *) attrp;
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else
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attr.valp = (unsigned char *) die_addr;
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attr.cu = die->cu;
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/* Now call the callback function. */
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if (callback (&attr, arg) != DWARF_CB_OK)
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/* Return the offset of the start of the attribute, so that
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dwarf_getattrs() can be restarted from this point if the
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caller so desires. */
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return remembered_attrp - abbrevp->attrp;
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}
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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 = __libdw_form_val_len (die->cu, attr.form, die_addr);
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if (unlikely (len == (size_t) -1l))
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/* Something wrong with the file. */
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return -1l;
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// __libdw_form_val_len will have done a bounds check.
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die_addr += len;
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if (attr.form == DW_FORM_implicit_const)
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{
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int64_t attr_value __attribute__((__unused__));
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get_sleb128_unchecked (attr_value, attrp);
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}
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}
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}
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/* NOTREACHED */
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}
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