1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/utilities/elfSymbolTable.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,140 @@
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 "utilities/elfFuncDescTable.hpp"
1.34 +#include "utilities/elfSymbolTable.hpp"
1.35 +
1.36 +ElfSymbolTable::ElfSymbolTable(FILE* file, Elf_Shdr shdr) {
1.37 + assert(file, "null file handle");
1.38 + m_symbols = NULL;
1.39 + m_next = NULL;
1.40 + m_file = file;
1.41 + m_status = NullDecoder::no_error;
1.42 +
1.43 + // try to load the string table
1.44 + long cur_offset = ftell(file);
1.45 + if (cur_offset != -1) {
1.46 + // call malloc so we can back up if memory allocation fails.
1.47 + m_symbols = (Elf_Sym*)os::malloc(shdr.sh_size, mtInternal);
1.48 + if (m_symbols) {
1.49 + if (fseek(file, shdr.sh_offset, SEEK_SET) ||
1.50 + fread((void*)m_symbols, shdr.sh_size, 1, file) != 1 ||
1.51 + fseek(file, cur_offset, SEEK_SET)) {
1.52 + m_status = NullDecoder::file_invalid;
1.53 + os::free(m_symbols);
1.54 + m_symbols = NULL;
1.55 + }
1.56 + }
1.57 + if (!NullDecoder::is_error(m_status)) {
1.58 + memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
1.59 + }
1.60 + } else {
1.61 + m_status = NullDecoder::file_invalid;
1.62 + }
1.63 +}
1.64 +
1.65 +ElfSymbolTable::~ElfSymbolTable() {
1.66 + if (m_symbols != NULL) {
1.67 + os::free(m_symbols);
1.68 + }
1.69 +
1.70 + if (m_next != NULL) {
1.71 + delete m_next;
1.72 + }
1.73 +}
1.74 +
1.75 +bool ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset, ElfFuncDescTable* funcDescTable) {
1.76 + assert(stringtableIndex, "null string table index pointer");
1.77 + assert(posIndex, "null string table offset pointer");
1.78 + assert(offset, "null offset pointer");
1.79 +
1.80 + if (NullDecoder::is_error(m_status)) {
1.81 + return false;
1.82 + }
1.83 +
1.84 + size_t sym_size = sizeof(Elf_Sym);
1.85 + assert((m_shdr.sh_size % sym_size) == 0, "check size");
1.86 + int count = m_shdr.sh_size / sym_size;
1.87 + if (m_symbols != NULL) {
1.88 + for (int index = 0; index < count; index ++) {
1.89 + if (STT_FUNC == ELF_ST_TYPE(m_symbols[index].st_info)) {
1.90 + Elf_Word st_size = m_symbols[index].st_size;
1.91 + address sym_addr;
1.92 + if (funcDescTable != NULL && funcDescTable->get_index() == m_symbols[index].st_shndx) {
1.93 + // We need to go another step trough the function descriptor table (currently PPC64 only)
1.94 + sym_addr = funcDescTable->lookup(m_symbols[index].st_value);
1.95 + } else {
1.96 + sym_addr = (address)m_symbols[index].st_value;
1.97 + }
1.98 + if (sym_addr <= addr && (Elf_Word)(addr - sym_addr) < st_size) {
1.99 + *offset = (int)(addr - sym_addr);
1.100 + *posIndex = m_symbols[index].st_name;
1.101 + *stringtableIndex = m_shdr.sh_link;
1.102 + return true;
1.103 + }
1.104 + }
1.105 + }
1.106 + } else {
1.107 + long cur_pos;
1.108 + if ((cur_pos = ftell(m_file)) == -1 ||
1.109 + fseek(m_file, m_shdr.sh_offset, SEEK_SET)) {
1.110 + m_status = NullDecoder::file_invalid;
1.111 + return false;
1.112 + }
1.113 +
1.114 + Elf_Sym sym;
1.115 + for (int index = 0; index < count; index ++) {
1.116 + if (fread(&sym, sym_size, 1, m_file) == 1) {
1.117 + if (STT_FUNC == ELF_ST_TYPE(sym.st_info)) {
1.118 + Elf_Word st_size = sym.st_size;
1.119 + address sym_addr;
1.120 + if (funcDescTable != NULL && funcDescTable->get_index() == sym.st_shndx) {
1.121 + // We need to go another step trough the function descriptor table (currently PPC64 only)
1.122 + sym_addr = funcDescTable->lookup(sym.st_value);
1.123 + } else {
1.124 + sym_addr = (address)sym.st_value;
1.125 + }
1.126 + if (sym_addr <= addr && (Elf_Word)(addr - sym_addr) < st_size) {
1.127 + *offset = (int)(addr - sym_addr);
1.128 + *posIndex = sym.st_name;
1.129 + *stringtableIndex = m_shdr.sh_link;
1.130 + return true;
1.131 + }
1.132 + }
1.133 + } else {
1.134 + m_status = NullDecoder::file_invalid;
1.135 + return false;
1.136 + }
1.137 + }
1.138 + fseek(m_file, cur_pos, SEEK_SET);
1.139 + }
1.140 + return true;
1.141 +}
1.142 +
1.143 +#endif // !_WINDOWS && !__APPLE__
