annotate src/share/vm/utilities/elfFile.hpp @ 17716:cdb71841f4bc

6498581: ThreadInterruptTest3 produces wrong output on Windows Summary: There is race condition between os::interrupt and os::is_interrupted on Windows. In JVM_Sleep(Thread.sleep), check if thread gets interrupted, it may see interrupted but not really interrupted so cause spurious waking up (early return from sleep). Fix by checking if interrupt event really gets set thus prevent false return. For intrinsic of _isInterrupted, on Windows, go fastpath only on bit not set. Reviewed-by: acorn, kvn Contributed-by: david.holmes@oracle.com, yumin.qi@oracle.com
author minqi
date Wed, 26 Feb 2014 15:20:41 -0800
parents 55fb97c4c58d
children abec000618bf
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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
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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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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158 #endif // SHARE_VM_UTILITIES_ELF_FILE_HPP