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annotate src/share/vm/utilities/elfFile.cpp @ 8733:9def4075da6d

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8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord Summary: Update the task local finger to the start of the next object when marking aborts, in order to avoid the redundant scanning of all 0's when the marking task restarts, if otherwise updating to the next word. In addition, reuse the routine nextObject() in routine iterate(). Reviewed-by: johnc, ysr Contributed-by: tamao <tao.mao@oracle.com>
author tamao
date Tue, 05 Mar 2013 15:36:56 -0800
parents b9a9ed0f8eeb
children 9058789475af
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1 /*
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2 * Copyright (c) 1997, 2012, 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
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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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
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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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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25 #include "precompiled.hpp"
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26
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27 #if !defined(_WINDOWS) && !defined(__APPLE__)
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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 #include <new>
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33
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34 #include "memory/allocation.inline.hpp"
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35 #include "utilities/decoder.hpp"
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36 #include "utilities/elfFile.hpp"
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37 #include "utilities/elfStringTable.hpp"
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38 #include "utilities/elfSymbolTable.hpp"
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40
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41 ElfFile::ElfFile(const char* filepath) {
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42 assert(filepath, "null file path");
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43 memset(&m_elfHdr, 0, sizeof(m_elfHdr));
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44 m_string_tables = NULL;
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45 m_symbol_tables = NULL;
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46 m_next = NULL;
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47 m_status = NullDecoder::no_error;
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48
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49 int len = strlen(filepath) + 1;
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50 m_filepath = (const char*)os::malloc(len * sizeof(char), mtInternal);
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51 if (m_filepath != NULL) {
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52 strcpy((char*)m_filepath, filepath);
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53 m_file = fopen(filepath, "r");
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54 if (m_file != NULL) {
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55 load_tables();
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56 } else {
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57 m_status = NullDecoder::file_not_found;
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58 }
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59 } else {
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60 m_status = NullDecoder::out_of_memory;
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61 }
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62 }
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63
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64 ElfFile::~ElfFile() {
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65 if (m_string_tables != NULL) {
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66 delete m_string_tables;
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67 }
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68
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69 if (m_symbol_tables != NULL) {
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70 delete m_symbol_tables;
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71 }
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72
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73 if (m_file != NULL) {
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74 fclose(m_file);
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75 }
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76
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77 if (m_filepath != NULL) {
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78 os::free((void*)m_filepath);
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79 }
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80
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81 if (m_next != NULL) {
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82 delete m_next;
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83 }
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84 };
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85
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86
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87 //Check elf header to ensure the file is valid.
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88 bool ElfFile::is_elf_file(Elf_Ehdr& hdr) {
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89 return (ELFMAG0 == hdr.e_ident[EI_MAG0] &&
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90 ELFMAG1 == hdr.e_ident[EI_MAG1] &&
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91 ELFMAG2 == hdr.e_ident[EI_MAG2] &&
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92 ELFMAG3 == hdr.e_ident[EI_MAG3] &&
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93 ELFCLASSNONE != hdr.e_ident[EI_CLASS] &&
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94 ELFDATANONE != hdr.e_ident[EI_DATA]);
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95 }
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96
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97 bool ElfFile::load_tables() {
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98 assert(m_file, "file not open");
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99 assert(!NullDecoder::is_error(m_status), "already in error");
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100
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101 // read elf file header
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102 if (fread(&m_elfHdr, sizeof(m_elfHdr), 1, m_file) != 1) {
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103 m_status = NullDecoder::file_invalid;
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104 return false;
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105 }
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106
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107 if (!is_elf_file(m_elfHdr)) {
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108 m_status = NullDecoder::file_invalid;
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109 return false;
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110 }
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111
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112 // walk elf file's section headers, and load string tables
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113 Elf_Shdr shdr;
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114 if (!fseek(m_file, m_elfHdr.e_shoff, SEEK_SET)) {
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115 if (NullDecoder::is_error(m_status)) return false;
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116
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117 for (int index = 0; index < m_elfHdr.e_shnum; index ++) {
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118 if (fread((void*)&shdr, sizeof(Elf_Shdr), 1, m_file) != 1) {
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119 m_status = NullDecoder::file_invalid;
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120 return false;
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121 }
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122 // string table
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123 if (shdr.sh_type == SHT_STRTAB) {
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124 ElfStringTable* table = new (std::nothrow) ElfStringTable(m_file, shdr, index);
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125 if (table == NULL) {
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126 m_status = NullDecoder::out_of_memory;
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127 return false;
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128 }
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129 add_string_table(table);
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130 } else if (shdr.sh_type == SHT_SYMTAB || shdr.sh_type == SHT_DYNSYM) {
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131 ElfSymbolTable* table = new (std::nothrow) ElfSymbolTable(m_file, shdr);
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132 if (table == NULL) {
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133 m_status = NullDecoder::out_of_memory;
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134 return false;
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135 }
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136 add_symbol_table(table);
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137 }
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138 }
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139 }
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140 return true;
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141 }
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142
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143 bool ElfFile::decode(address addr, char* buf, int buflen, int* offset) {
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144 // something already went wrong, just give up
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145 if (NullDecoder::is_error(m_status)) {
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146 return false;
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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 (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 false;
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160
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161 ElfStringTable* string_table = get_string_table(string_table_index);
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162
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163 if (string_table == NULL) {
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164 m_status = NullDecoder::file_invalid;
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165 return false;
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166 }
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167 if (offset) *offset = off;
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168
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169 return string_table->string_at(pos_in_string_table, buf, buflen);
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170 }
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171
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172
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173 void ElfFile::add_symbol_table(ElfSymbolTable* table) {
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174 if (m_symbol_tables == NULL) {
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175 m_symbol_tables = table;
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176 } else {
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177 table->m_next = m_symbol_tables;
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178 m_symbol_tables = table;
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179 }
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180 }
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181
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182 void ElfFile::add_string_table(ElfStringTable* table) {
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183 if (m_string_tables == NULL) {
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184 m_string_tables = table;
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185 } else {
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186 table->m_next = m_string_tables;
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187 m_string_tables = table;
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188 }
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189 }
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190
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191 ElfStringTable* ElfFile::get_string_table(int index) {
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192 ElfStringTable* p = m_string_tables;
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193 while (p != NULL) {
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194 if (p->index() == index) return p;
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195 p = p->m_next;
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196 }
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197 return NULL;
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198 }
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199
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200 #endif // _WINDOWS