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/* Get abbreviation at given offset.
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Copyright (C) 2003, 2004, 2005, 2006, 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>, 2003.
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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 <dwarf.h>
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#include "libdwP.h"
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Dwarf_Abbrev *
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internal_function
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__libdw_getabbrev (Dwarf *dbg, struct Dwarf_CU *cu, Dwarf_Off offset,
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size_t *lengthp, Dwarf_Abbrev *result)
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{
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/* Don't fail if there is not .debug_abbrev section. */
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if (dbg->sectiondata[IDX_debug_abbrev] == NULL)
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return NULL;
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if (offset >= dbg->sectiondata[IDX_debug_abbrev]->d_size)
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{
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__libdw_seterrno (DWARF_E_INVALID_OFFSET);
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return NULL;
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}
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const unsigned char *abbrevp
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= (unsigned char *) dbg->sectiondata[IDX_debug_abbrev]->d_buf + offset;
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if (*abbrevp == '\0')
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/* We are past the last entry. */
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return DWARF_END_ABBREV;
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/* 7.5.3 Abbreviations Tables
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[...] Each declaration begins with an unsigned LEB128 number
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representing the abbreviation code itself. [...] The
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abbreviation code is followed by another unsigned LEB128
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number that encodes the entry's tag. [...]
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[...] Following the tag encoding is a 1-byte value that
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determines whether a debugging information entry using this
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abbreviation has child entries or not. [...]
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[...] Finally, the child encoding is followed by a series of
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attribute specifications. Each attribute specification
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consists of two parts. The first part is an unsigned LEB128
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number representing the attribute's name. The second part is
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an unsigned LEB128 number representing the attribute's form. */
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const unsigned char *end = (dbg->sectiondata[IDX_debug_abbrev]->d_buf
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+ dbg->sectiondata[IDX_debug_abbrev]->d_size);
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const unsigned char *start_abbrevp = abbrevp;
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unsigned int code;
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get_uleb128 (code, abbrevp, end);
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/* Check whether this code is already in the hash table. */
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bool foundit = false;
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Dwarf_Abbrev *abb = NULL;
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if (cu == NULL
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|| (abb = Dwarf_Abbrev_Hash_find (&cu->abbrev_hash, code)) == NULL)
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{
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if (result == NULL)
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abb = libdw_typed_alloc (dbg, Dwarf_Abbrev);
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else
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abb = result;
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}
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else
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{
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foundit = true;
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if (unlikely (abb->offset != offset))
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{
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/* A duplicate abbrev code at a different offset,
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that should never happen. */
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invalid:
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if (! foundit)
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libdw_typed_unalloc (dbg, Dwarf_Abbrev);
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__libdw_seterrno (DWARF_E_INVALID_DWARF);
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return NULL;
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}
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/* If the caller doesn't need the length we are done. */
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if (lengthp == NULL)
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goto out;
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}
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/* If there is already a value in the hash table we are going to
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overwrite its content. This must not be a problem, since the
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content better be the same. */
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abb->code = code;
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if (abbrevp >= end)
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goto invalid;
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get_uleb128 (abb->tag, abbrevp, end);
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if (abbrevp + 1 >= end)
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goto invalid;
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abb->has_children = *abbrevp++ == DW_CHILDREN_yes;
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abb->attrp = (unsigned char *) abbrevp;
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abb->offset = offset;
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/* Skip over all the attributes and check rest of the abbrev is valid. */
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unsigned int attrname;
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unsigned int attrform;
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do
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{
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if (abbrevp >= end)
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goto invalid;
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get_uleb128 (attrname, abbrevp, end);
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if (abbrevp >= end)
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goto invalid;
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get_uleb128 (attrform, abbrevp, end);
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if (attrform == DW_FORM_implicit_const)
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{
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int64_t formval __attribute__((__unused__));
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if (abbrevp >= end)
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goto invalid;
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get_sleb128 (formval, abbrevp, end);
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}
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}
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while (attrname != 0 || attrform != 0);
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/* Return the length to the caller if she asked for it. */
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if (lengthp != NULL)
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*lengthp = abbrevp - start_abbrevp;
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/* Add the entry to the hash table. */
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if (cu != NULL && ! foundit)
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if (Dwarf_Abbrev_Hash_insert (&cu->abbrev_hash, abb->code, abb) == -1)
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{
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/* The entry was already in the table, remove the one we just
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created and get the one already inserted. */
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libdw_typed_unalloc (dbg, Dwarf_Abbrev);
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abb = Dwarf_Abbrev_Hash_find (&cu->abbrev_hash, code);
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}
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out:
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return abb;
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}
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Dwarf_Abbrev *
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dwarf_getabbrev (Dwarf_Die *die, Dwarf_Off offset, size_t *lengthp)
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{
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if (die == NULL || die->cu == NULL)
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return NULL;
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Dwarf_CU *cu = die->cu;
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Dwarf *dbg = cu->dbg;
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Dwarf_Off abbrev_offset = cu->orig_abbrev_offset;
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Elf_Data *data = dbg->sectiondata[IDX_debug_abbrev];
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if (data == NULL)
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return NULL;
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if (offset >= data->d_size - abbrev_offset)
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{
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__libdw_seterrno (DWARF_E_INVALID_OFFSET);
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return NULL;
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}
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return __libdw_getabbrev (dbg, cu, abbrev_offset + offset, lengthp, NULL);
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}
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