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annotate src/share/vm/utilities/elfSymbolTable.cpp @ 17716:cdb71841f4bc

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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 b9a9ed0f8eeb
children e7cbc95179c4
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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
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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 #include "precompiled.hpp"
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26
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27 #if !defined(_WINDOWS) && !defined(__APPLE__)
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28
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29 #include "memory/allocation.inline.hpp"
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30 #include "utilities/elfSymbolTable.hpp"
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31
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32 ElfSymbolTable::ElfSymbolTable(FILE* file, Elf_Shdr shdr) {
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33 assert(file, "null file handle");
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34 m_symbols = NULL;
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35 m_next = NULL;
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36 m_file = file;
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37 m_status = NullDecoder::no_error;
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38
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39 // try to load the string table
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40 long cur_offset = ftell(file);
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41 if (cur_offset != -1) {
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42 // call malloc so we can back up if memory allocation fails.
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43 m_symbols = (Elf_Sym*)os::malloc(shdr.sh_size, mtInternal);
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44 if (m_symbols) {
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45 if (fseek(file, shdr.sh_offset, SEEK_SET) ||
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46 fread((void*)m_symbols, shdr.sh_size, 1, file) != 1 ||
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47 fseek(file, cur_offset, SEEK_SET)) {
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48 m_status = NullDecoder::file_invalid;
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49 os::free(m_symbols);
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50 m_symbols = NULL;
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51 }
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52 }
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53 if (!NullDecoder::is_error(m_status)) {
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54 memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
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55 }
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56 } else {
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57 m_status = NullDecoder::file_invalid;
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58 }
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59 }
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60
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61 ElfSymbolTable::~ElfSymbolTable() {
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62 if (m_symbols != NULL) {
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63 os::free(m_symbols);
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64 }
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65
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66 if (m_next != NULL) {
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67 delete m_next;
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68 }
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69 }
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70
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71 bool ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset) {
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72 assert(stringtableIndex, "null string table index pointer");
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73 assert(posIndex, "null string table offset pointer");
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74 assert(offset, "null offset pointer");
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75
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76 if (NullDecoder::is_error(m_status)) {
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77 return false;
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78 }
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79
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80 address pc = 0;
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81 size_t sym_size = sizeof(Elf_Sym);
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82 assert((m_shdr.sh_size % sym_size) == 0, "check size");
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83 int count = m_shdr.sh_size / sym_size;
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84 if (m_symbols != NULL) {
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85 for (int index = 0; index < count; index ++) {
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86 if (STT_FUNC == ELF_ST_TYPE(m_symbols[index].st_info)) {
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87 address sym_addr = (address)m_symbols[index].st_value;
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88 if (sym_addr < addr && (addr - sym_addr) < *offset) {
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89 pc = (address)m_symbols[index].st_value;
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90 *offset = (int)(addr - pc);
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91 *posIndex = m_symbols[index].st_name;
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92 *stringtableIndex = m_shdr.sh_link;
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93 }
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94 }
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95 }
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96 } else {
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97 long cur_pos;
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98 if ((cur_pos = ftell(m_file)) == -1 ||
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99 fseek(m_file, m_shdr.sh_offset, SEEK_SET)) {
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100 m_status = NullDecoder::file_invalid;
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101 return false;
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102 }
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103
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104 Elf_Sym sym;
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105 for (int index = 0; index < count; index ++) {
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106 if (fread(&sym, sym_size, 1, m_file) == 1) {
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107 if (STT_FUNC == ELF_ST_TYPE(sym.st_info)) {
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108 address sym_addr = (address)sym.st_value;
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109 if (sym_addr < addr && (addr - sym_addr) < *offset) {
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110 pc = (address)sym.st_value;
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111 *offset = (int)(addr - pc);
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112 *posIndex = sym.st_name;
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113 *stringtableIndex = m_shdr.sh_link;
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114 }
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115 }
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116 } else {
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117 m_status = NullDecoder::file_invalid;
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118 return false;
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119 }
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120 }
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121 fseek(m_file, cur_pos, SEEK_SET);
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122 }
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123 return true;
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124 }
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125
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126 #endif // _WINDOWS