1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/utilities/elfStringTable.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,90 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +
1.30 +#if !defined(_WINDOWS) && !defined(__APPLE__)
1.31 +
1.32 +#include "memory/allocation.inline.hpp"
1.33 +#include "runtime/os.hpp"
1.34 +#include "utilities/elfStringTable.hpp"
1.35 +
1.36 +// We will try to load whole string table into memory if we can.
1.37 +// Otherwise, fallback to more expensive file operation.
1.38 +ElfStringTable::ElfStringTable(FILE* file, Elf_Shdr shdr, int index) {
1.39 + assert(file, "null file handle");
1.40 + m_table = NULL;
1.41 + m_index = index;
1.42 + m_next = NULL;
1.43 + m_file = file;
1.44 + m_status = NullDecoder::no_error;
1.45 +
1.46 + // try to load the string table
1.47 + long cur_offset = ftell(file);
1.48 + m_table = (char*)os::malloc(sizeof(char) * shdr.sh_size, mtInternal);
1.49 + if (m_table != NULL) {
1.50 + // if there is an error, mark the error
1.51 + if (fseek(file, shdr.sh_offset, SEEK_SET) ||
1.52 + fread((void*)m_table, shdr.sh_size, 1, file) != 1 ||
1.53 + fseek(file, cur_offset, SEEK_SET)) {
1.54 + m_status = NullDecoder::file_invalid;
1.55 + os::free((void*)m_table);
1.56 + m_table = NULL;
1.57 + }
1.58 + } else {
1.59 + memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
1.60 + }
1.61 +}
1.62 +
1.63 +ElfStringTable::~ElfStringTable() {
1.64 + if (m_table != NULL) {
1.65 + os::free((void*)m_table);
1.66 + }
1.67 +
1.68 + if (m_next != NULL) {
1.69 + delete m_next;
1.70 + }
1.71 +}
1.72 +
1.73 +bool ElfStringTable::string_at(int pos, char* buf, int buflen) {
1.74 + if (NullDecoder::is_error(m_status)) {
1.75 + return false;
1.76 + }
1.77 + if (m_table != NULL) {
1.78 + jio_snprintf(buf, buflen, "%s", (const char*)(m_table + pos));
1.79 + return true;
1.80 + } else {
1.81 + long cur_pos = ftell(m_file);
1.82 + if (cur_pos == -1 ||
1.83 + fseek(m_file, m_shdr.sh_offset + pos, SEEK_SET) ||
1.84 + fread(buf, 1, buflen, m_file) <= 0 ||
1.85 + fseek(m_file, cur_pos, SEEK_SET)) {
1.86 + m_status = NullDecoder::file_invalid;
1.87 + return false;
1.88 + }
1.89 + return true;
1.90 + }
1.91 +}
1.92 +
1.93 +#endif // !_WINDOWS && !__APPLE__
