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annotate src/share/vm/utilities/elfFile.hpp @ 17524:89152779163c

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Merge with jdk8-b132
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 15 Oct 2014 11:59:32 +0200
parents 4ca6dc0799b6
children 52b4284cb496
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1 /*
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2 * Copyright (c) 1997, 2013, 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
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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24
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25 #ifndef SHARE_VM_UTILITIES_ELF_FILE_HPP
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26 #define SHARE_VM_UTILITIES_ELF_FILE_HPP
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27
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28 #if !defined(_WINDOWS) && !defined(__APPLE__)
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29
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30 #if defined(__OpenBSD__)
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31 #include <sys/exec_elf.h>
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32 #else
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33 #include <elf.h>
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34 #endif
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35 #include <stdio.h>
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36
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37 #ifdef _LP64
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38
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39 typedef Elf64_Half Elf_Half;
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40 typedef Elf64_Word Elf_Word;
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41 typedef Elf64_Off Elf_Off;
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42 typedef Elf64_Addr Elf_Addr;
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43
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44 typedef Elf64_Ehdr Elf_Ehdr;
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45 typedef Elf64_Shdr Elf_Shdr;
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46 typedef Elf64_Phdr Elf_Phdr;
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47 typedef Elf64_Sym Elf_Sym;
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48
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49 #if !defined(_ALLBSD_SOURCE) || defined(__APPLE__)
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50 #define ELF_ST_TYPE ELF64_ST_TYPE
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51 #endif
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52
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53 #else
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54
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55 typedef Elf32_Half Elf_Half;
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56 typedef Elf32_Word Elf_Word;
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57 typedef Elf32_Off Elf_Off;
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58 typedef Elf32_Addr Elf_Addr;
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59
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60
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61 typedef Elf32_Ehdr Elf_Ehdr;
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62 typedef Elf32_Shdr Elf_Shdr;
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63 typedef Elf32_Phdr Elf_Phdr;
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64 typedef Elf32_Sym Elf_Sym;
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65
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66 #if !defined(_ALLBSD_SOURCE) || defined(__APPLE__)
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67 #define ELF_ST_TYPE ELF32_ST_TYPE
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68 #endif
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69 #endif
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70
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71 #include "globalDefinitions.hpp"
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72 #include "memory/allocation.hpp"
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73 #include "utilities/decoder.hpp"
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74
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75
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76 class ElfStringTable;
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77 class ElfSymbolTable;
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78
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79
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80 // On Solaris/Linux platforms, libjvm.so does contain all private symbols.
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81 // ElfFile is basically an elf file parser, which can lookup the symbol
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82 // that is the nearest to the given address.
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83 // Beware, this code is called from vm error reporting code, when vm is already
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84 // in "error" state, so there are scenarios, lookup will fail. We want this
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85 // part of code to be very defensive, and bait out if anything went wrong.
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86
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87 class ElfFile: public CHeapObj<mtInternal> {
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88 friend class ElfDecoder;
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89 public:
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90 ElfFile(const char* filepath);
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91 ~ElfFile();
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92
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93 bool decode(address addr, char* buf, int buflen, int* offset);
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94 const char* filepath() {
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95 return m_filepath;
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96 }
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97
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98 bool same_elf_file(const char* filepath) {
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99 assert(filepath, "null file path");
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100 assert(m_filepath, "already out of memory");
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101 return (m_filepath && !strcmp(filepath, m_filepath));
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102 }
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103
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104 NullDecoder::decoder_status get_status() {
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105 return m_status;
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106 }
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107
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108 private:
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109 // sanity check, if the file is a real elf file
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110 bool is_elf_file(Elf_Ehdr&);
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111
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112 // load string tables from the elf file
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113 bool load_tables();
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114
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115 // string tables are stored in a linked list
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116 void add_string_table(ElfStringTable* table);
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117
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118 // symbol tables are stored in a linked list
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119 void add_symbol_table(ElfSymbolTable* table);
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120
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121 // return a string table at specified section index
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122 ElfStringTable* get_string_table(int index);
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123
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124 protected:
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125 ElfFile* next() const { return m_next; }
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126 void set_next(ElfFile* file) { m_next = file; }
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127
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128 public:
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129 // Returns true if the elf file is marked NOT to require an executable stack,
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130 // or if the file could not be opened.
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131 // Returns false if the elf file requires an executable stack, the stack flag
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132 // is not set at all, or if the file can not be read.
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133 // On systems other than linux it always returns false.
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134 bool specifies_noexecstack() NOT_LINUX({ return false; });
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135
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136 protected:
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137 ElfFile* m_next;
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138
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139 private:
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140 // file
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141 const char* m_filepath;
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142 FILE* m_file;
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143
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144 // Elf header
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145 Elf_Ehdr m_elfHdr;
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146
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147 // symbol tables
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148 ElfSymbolTable* m_symbol_tables;
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149
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150 // string tables
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151 ElfStringTable* m_string_tables;
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152
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153 NullDecoder::decoder_status m_status;
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154 };
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155
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156 #endif // _WINDOWS
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157
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158 #endif // SHARE_VM_UTILITIES_ELF_FILE_HPP