elfStringTable.cpp revision 3465:d2a62e0f25eb
11553Srgrimes/* 21553Srgrimes * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. 31553Srgrimes * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 41553Srgrimes * 51553Srgrimes * This code is free software; you can redistribute it and/or modify it 61553Srgrimes * under the terms of the GNU General Public License version 2 only, as 71553Srgrimes * published by the Free Software Foundation. 81553Srgrimes * 91553Srgrimes * This code is distributed in the hope that it will be useful, but WITHOUT 101553Srgrimes * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 111553Srgrimes * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 121553Srgrimes * version 2 for more details (a copy is included in the LICENSE file that 131553Srgrimes * accompanied this code). 141553Srgrimes * 151553Srgrimes * You should have received a copy of the GNU General Public License version 161553Srgrimes * 2 along with this work; if not, write to the Free Software Foundation, 171553Srgrimes * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 181553Srgrimes * 191553Srgrimes * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 201553Srgrimes * or visit www.oracle.com if you need additional information or have any 211553Srgrimes * questions. 221553Srgrimes * 231553Srgrimes */ 241553Srgrimes 251553Srgrimes#include "precompiled.hpp" 261553Srgrimes 271553Srgrimes#if !defined(_WINDOWS) && !defined(__APPLE__) 281553Srgrimes 291553Srgrimes#include "memory/allocation.inline.hpp" 301553Srgrimes#include "runtime/os.hpp" 311553Srgrimes#include "utilities/elfStringTable.hpp" 321553Srgrimes 331553Srgrimes// We will try to load whole string table into memory if we can. 341553Srgrimes// Otherwise, fallback to more expensive file operation. 351553SrgrimesElfStringTable::ElfStringTable(FILE* file, Elf_Shdr shdr, int index) { 361553Srgrimes assert(file, "null file handle"); 371553Srgrimes m_table = NULL; 3813977Sphk m_index = index; 391553Srgrimes m_next = NULL; 401553Srgrimes m_file = file; 411553Srgrimes m_status = NullDecoder::no_error; 421553Srgrimes 431553Srgrimes // try to load the string table 4429060Scharnier long cur_offset = ftell(file); 4513977Sphk m_table = (char*)os::malloc(sizeof(char) * shdr.sh_size, mtInternal); 4629060Scharnier if (m_table != NULL) { 4729060Scharnier // if there is an error, mark the error 4850479Speter if (fseek(file, shdr.sh_offset, SEEK_SET) || 491553Srgrimes fread((void*)m_table, shdr.sh_size, 1, file) != 1 || 501553Srgrimes fseek(file, cur_offset, SEEK_SET)) { 511553Srgrimes m_status = NullDecoder::file_invalid; 521553Srgrimes os::free((void*)m_table); 531553Srgrimes m_table = NULL; 541553Srgrimes } 551553Srgrimes } else { 561553Srgrimes memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr)); 571553Srgrimes } 581553Srgrimes} 5913977Sphk 601553SrgrimesElfStringTable::~ElfStringTable() { 6113977Sphk if (m_table != NULL) { 6220287Swollman os::free((void*)m_table); 631553Srgrimes } 641553Srgrimes 651553Srgrimes if (m_next != NULL) { 661553Srgrimes delete m_next; 6796235Swpaul } 6896202Skbyanc} 691553Srgrimes 701553Srgrimesbool ElfStringTable::string_at(int pos, char* buf, int buflen) { 711553Srgrimes if (NullDecoder::is_error(m_status)) { 721553Srgrimes return false; 731553Srgrimes } 741553Srgrimes if (m_table != NULL) { 75108314Sru jio_snprintf(buf, buflen, "%s", (const char*)(m_table + pos)); 7629060Scharnier return true; 7729060Scharnier } else { 781553Srgrimes long cur_pos = ftell(m_file); 791553Srgrimes if (cur_pos == -1 || 8029060Scharnier fseek(m_file, m_shdr.sh_offset + pos, SEEK_SET) || 811553Srgrimes fread(buf, 1, buflen, m_file) <= 0 || 8213977Sphk fseek(m_file, cur_pos, SEEK_SET)) { 8393590Smike m_status = NullDecoder::file_invalid; 8429060Scharnier return false; 8513977Sphk } 861553Srgrimes return true; 8731145Sjulian } 8831145Sjulian} 8931145Sjulian 9087598Smikeh#endif // _WINDOWS 9131145Sjulian