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annotate src/share/vm/utilities/elfSymbolTable.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 d28def44457d
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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
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
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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 "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 = Decoder::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 m_symbols = (Elf_Sym*)NEW_C_HEAP_ARRAY(char, shdr.sh_size);
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43 if (m_symbols) {
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44 if (fseek(file, shdr.sh_offset, SEEK_SET) ||
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45 fread((void*)m_symbols, shdr.sh_size, 1, file) != 1 ||
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46 fseek(file, cur_offset, SEEK_SET)) {
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47 m_status = Decoder::file_invalid;
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48 FREE_C_HEAP_ARRAY(char, m_symbols);
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49 m_symbols = NULL;
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50 }
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51 }
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52 if (m_status == Decoder::no_error) {
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53 memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
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54 }
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55 } else {
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56 m_status = Decoder::file_invalid;
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57 }
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58 }
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59
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60 ElfSymbolTable::~ElfSymbolTable() {
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61 if (m_symbols != NULL) {
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62 FREE_C_HEAP_ARRAY(char, m_symbols);
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63 }
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64
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65 if (m_next != NULL) {
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66 delete m_next;
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67 }
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68 }
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69
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70 Decoder::decoder_status ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset) {
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71 assert(stringtableIndex, "null string table index pointer");
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72 assert(posIndex, "null string table offset pointer");
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73 assert(offset, "null offset pointer");
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74
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75 if (m_status != Decoder::no_error) {
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76 return m_status;
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77 }
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78
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79 address pc = 0;
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80 size_t sym_size = sizeof(Elf_Sym);
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81 assert((m_shdr.sh_size % sym_size) == 0, "check size");
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82 int count = m_shdr.sh_size / sym_size;
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83 if (m_symbols != NULL) {
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84 for (int index = 0; index < count; index ++) {
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85 if (STT_FUNC == ELF_ST_TYPE(m_symbols[index].st_info)) {
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86 address sym_addr = (address)m_symbols[index].st_value;
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87 if (sym_addr < addr && (addr - sym_addr) < *offset) {
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88 pc = (address)m_symbols[index].st_value;
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89 *offset = (int)(addr - pc);
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90 *posIndex = m_symbols[index].st_name;
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91 *stringtableIndex = m_shdr.sh_link;
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92 }
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93 }
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94 }
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95 } else {
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96 long cur_pos;
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97 if ((cur_pos = ftell(m_file)) == -1 ||
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98 fseek(m_file, m_shdr.sh_offset, SEEK_SET)) {
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99 m_status = Decoder::file_invalid;
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100 return m_status;
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101 }
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102
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103 Elf_Sym sym;
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104 for (int index = 0; index < count; index ++) {
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105 if (fread(&sym, sym_size, 1, m_file) == 1) {
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106 if (STT_FUNC == ELF_ST_TYPE(sym.st_info)) {
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107 address sym_addr = (address)sym.st_value;
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108 if (sym_addr < addr && (addr - sym_addr) < *offset) {
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109 pc = (address)sym.st_value;
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110 *offset = (int)(addr - pc);
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111 *posIndex = sym.st_name;
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112 *stringtableIndex = m_shdr.sh_link;
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113 }
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114 }
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115 } else {
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116 m_status = Decoder::file_invalid;
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117 return m_status;
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118 }
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119 }
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120 fseek(m_file, cur_pos, SEEK_SET);
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121 }
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122 return m_status;
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123 }
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124
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125 #endif // _WINDOWS