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annotate src/share/vm/utilities/elfFile.cpp @ 2177:3582bf76420e

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6990754: Use native memory and reference counting to implement SymbolTable Summary: move symbols from permgen into C heap and reference count them Reviewed-by: never, acorn, jmasa, stefank
author coleenp
date Thu, 27 Jan 2011 16:11:27 -0800
parents 2d4762ec74af
children 2a3da7eaf4a6
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2022
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1 /*
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2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26
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27 #ifndef _WINDOWS
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28
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29 #include <string.h>
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30 #include <stdio.h>
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31 #include <limits.h>
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32
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33 #include "memory/allocation.inline.hpp"
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34 #include "utilities/decoder.hpp"
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35 #include "utilities/elfFile.hpp"
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36 #include "utilities/elfStringTable.hpp"
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37 #include "utilities/elfSymbolTable.hpp"
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38
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39
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40 ElfFile::ElfFile(const char* filepath) {
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41 assert(filepath, "null file path");
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42 memset(&m_elfHdr, 0, sizeof(m_elfHdr));
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43 m_string_tables = NULL;
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44 m_symbol_tables = NULL;
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45 m_next = NULL;
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46 m_status = Decoder::no_error;
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47
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48 int len = strlen(filepath) + 1;
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49 m_filepath = NEW_C_HEAP_ARRAY(char, len);
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50 if (m_filepath != NULL) {
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51 strcpy((char*)m_filepath, filepath);
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52 m_file = fopen(filepath, "r");
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53 if (m_file != NULL) {
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54 load_tables();
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55 } else {
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56 m_status = Decoder::file_not_found;
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57 }
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58 } else {
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59 m_status = Decoder::out_of_memory;
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60 }
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61 }
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62
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63 ElfFile::~ElfFile() {
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64 if (m_string_tables != NULL) {
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65 delete m_string_tables;
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66 }
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67
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68 if (m_symbol_tables != NULL) {
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69 delete m_symbol_tables;
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70 }
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71
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72 if (m_file != NULL) {
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73 fclose(m_file);
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74 }
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75
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76 if (m_filepath != NULL) {
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77 FREE_C_HEAP_ARRAY(char, m_filepath);
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78 }
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79
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80 if (m_next != NULL) {
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81 delete m_next;
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82 }
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83 };
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84
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85
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86 //Check elf header to ensure the file is valid.
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87 bool ElfFile::is_elf_file(Elf_Ehdr& hdr) {
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88 return (ELFMAG0 == hdr.e_ident[EI_MAG0] &&
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89 ELFMAG1 == hdr.e_ident[EI_MAG1] &&
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90 ELFMAG2 == hdr.e_ident[EI_MAG2] &&
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91 ELFMAG3 == hdr.e_ident[EI_MAG3] &&
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92 ELFCLASSNONE != hdr.e_ident[EI_CLASS] &&
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93 ELFDATANONE != hdr.e_ident[EI_DATA]);
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94 }
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95
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96 bool ElfFile::load_tables() {
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97 assert(m_file, "file not open");
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98 assert(m_status == Decoder::no_error, "already in error");
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99
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100 // read elf file header
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101 if (fread(&m_elfHdr, sizeof(m_elfHdr), 1, m_file) != 1) {
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102 m_status = Decoder::file_invalid;
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103 return false;
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104 }
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105
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106 if (!is_elf_file(m_elfHdr)) {
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107 m_status = Decoder::file_invalid;
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108 return false;
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109 }
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110
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111 // walk elf file's section headers, and load string tables
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112 Elf_Shdr shdr;
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113 if (!fseek(m_file, m_elfHdr.e_shoff, SEEK_SET)) {
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114 if (m_status != Decoder::no_error) return false;
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115
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116 for (int index = 0; index < m_elfHdr.e_shnum; index ++) {
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117 if (fread((void*)&shdr, sizeof(Elf_Shdr), 1, m_file) != 1) {
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118 m_status = Decoder::file_invalid;
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119 return false;
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120 }
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121 // string table
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122 if (shdr.sh_type == SHT_STRTAB) {
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123 ElfStringTable* table = new ElfStringTable(m_file, shdr, index);
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124 if (table == NULL) {
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125 m_status = Decoder::out_of_memory;
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126 return false;
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127 }
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128 add_string_table(table);
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129 } else if (shdr.sh_type == SHT_SYMTAB || shdr.sh_type == SHT_DYNSYM) {
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130 ElfSymbolTable* table = new ElfSymbolTable(m_file, shdr);
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131 if (table == NULL) {
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132 m_status = Decoder::out_of_memory;
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133 return false;
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134 }
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135 add_symbol_table(table);
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136 }
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137 }
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138 }
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139 return true;
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140 }
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141
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142 const char* ElfFile::decode(address addr, int* offset) {
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143 // something already went wrong, just give up
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144 if (m_status != Decoder::no_error) {
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145 return NULL;
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146 }
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147
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148 ElfSymbolTable* symbol_table = m_symbol_tables;
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149 int string_table_index;
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150 int pos_in_string_table;
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151 int off = INT_MAX;
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152 bool found_symbol = false;
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153 while (symbol_table != NULL) {
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154 if (Decoder::no_error == symbol_table->lookup(addr, &string_table_index, &pos_in_string_table, &off)) {
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155 found_symbol = true;
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156 }
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157 symbol_table = symbol_table->m_next;
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158 }
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159 if (!found_symbol) return NULL;
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160
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161 ElfStringTable* string_table = get_string_table(string_table_index);
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162 if (string_table == NULL) {
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163 m_status = Decoder::file_invalid;
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164 return NULL;
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165 }
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166 if (offset) *offset = off;
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167 return string_table->string_at(pos_in_string_table);
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168 }
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169
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170
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171 void ElfFile::add_symbol_table(ElfSymbolTable* table) {
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172 if (m_symbol_tables == NULL) {
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173 m_symbol_tables = table;
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174 } else {
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175 table->m_next = m_symbol_tables;
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176 m_symbol_tables = table;
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177 }
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178 }
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179
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180 void ElfFile::add_string_table(ElfStringTable* table) {
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181 if (m_string_tables == NULL) {
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182 m_string_tables = table;
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183 } else {
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184 table->m_next = m_string_tables;
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185 m_string_tables = table;
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186 }
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187 }
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188
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189 ElfStringTable* ElfFile::get_string_table(int index) {
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190 ElfStringTable* p = m_string_tables;
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191 while (p != NULL) {
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192 if (p->index() == index) return p;
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193 p = p->m_next;
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194 }
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195 return NULL;
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196 }
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197
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198 #endif // _WINDOWS