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comparison src/share/vm/utilities/elfFile.cpp @ 2022:2d4762ec74af

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7003748: Decode C stack frames when symbols are presented (PhoneHome project) Summary: Implemented in-process C native stack frame decoding when symbols are available. Reviewed-by: coleenp, never
author zgu
date Sat, 11 Dec 2010 13:20:56 -0500
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children 2a3da7eaf4a6
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1972:f95d63e2154a 2022:2d4762ec74af
1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26
27 #ifndef _WINDOWS
28
29 #include <string.h>
30 #include <stdio.h>
31 #include <limits.h>
32
33 #include "memory/allocation.inline.hpp"
34 #include "utilities/decoder.hpp"
35 #include "utilities/elfFile.hpp"
36 #include "utilities/elfStringTable.hpp"
37 #include "utilities/elfSymbolTable.hpp"
38
39
40 ElfFile::ElfFile(const char* filepath) {
41 assert(filepath, "null file path");
42 memset(&m_elfHdr, 0, sizeof(m_elfHdr));
43 m_string_tables = NULL;
44 m_symbol_tables = NULL;
45 m_next = NULL;
46 m_status = Decoder::no_error;
47
48 int len = strlen(filepath) + 1;
49 m_filepath = NEW_C_HEAP_ARRAY(char, len);
50 if (m_filepath != NULL) {
51 strcpy((char*)m_filepath, filepath);
52 m_file = fopen(filepath, "r");
53 if (m_file != NULL) {
54 load_tables();
55 } else {
56 m_status = Decoder::file_not_found;
57 }
58 } else {
59 m_status = Decoder::out_of_memory;
60 }
61 }
62
63 ElfFile::~ElfFile() {
64 if (m_string_tables != NULL) {
65 delete m_string_tables;
66 }
67
68 if (m_symbol_tables != NULL) {
69 delete m_symbol_tables;
70 }
71
72 if (m_file != NULL) {
73 fclose(m_file);
74 }
75
76 if (m_filepath != NULL) {
77 FREE_C_HEAP_ARRAY(char, m_filepath);
78 }
79
80 if (m_next != NULL) {
81 delete m_next;
82 }
83 };
84
85
86 //Check elf header to ensure the file is valid.
87 bool ElfFile::is_elf_file(Elf_Ehdr& hdr) {
88 return (ELFMAG0 == hdr.e_ident[EI_MAG0] &&
89 ELFMAG1 == hdr.e_ident[EI_MAG1] &&
90 ELFMAG2 == hdr.e_ident[EI_MAG2] &&
91 ELFMAG3 == hdr.e_ident[EI_MAG3] &&
92 ELFCLASSNONE != hdr.e_ident[EI_CLASS] &&
93 ELFDATANONE != hdr.e_ident[EI_DATA]);
94 }
95
96 bool ElfFile::load_tables() {
97 assert(m_file, "file not open");
98 assert(m_status == Decoder::no_error, "already in error");
99
100 // read elf file header
101 if (fread(&m_elfHdr, sizeof(m_elfHdr), 1, m_file) != 1) {
102 m_status = Decoder::file_invalid;
103 return false;
104 }
105
106 if (!is_elf_file(m_elfHdr)) {
107 m_status = Decoder::file_invalid;
108 return false;
109 }
110
111 // walk elf file's section headers, and load string tables
112 Elf_Shdr shdr;
113 if (!fseek(m_file, m_elfHdr.e_shoff, SEEK_SET)) {
114 if (m_status != Decoder::no_error) return false;
115
116 for (int index = 0; index < m_elfHdr.e_shnum; index ++) {
117 if (fread((void*)&shdr, sizeof(Elf_Shdr), 1, m_file) != 1) {
118 m_status = Decoder::file_invalid;
119 return false;
120 }
121 // string table
122 if (shdr.sh_type == SHT_STRTAB) {
123 ElfStringTable* table = new ElfStringTable(m_file, shdr, index);
124 if (table == NULL) {
125 m_status = Decoder::out_of_memory;
126 return false;
127 }
128 add_string_table(table);
129 } else if (shdr.sh_type == SHT_SYMTAB || shdr.sh_type == SHT_DYNSYM) {
130 ElfSymbolTable* table = new ElfSymbolTable(m_file, shdr);
131 if (table == NULL) {
132 m_status = Decoder::out_of_memory;
133 return false;
134 }
135 add_symbol_table(table);
136 }
137 }
138 }
139 return true;
140 }
141
142 const char* ElfFile::decode(address addr, int* offset) {
143 // something already went wrong, just give up
144 if (m_status != Decoder::no_error) {
145 return NULL;
146 }
147
148 ElfSymbolTable* symbol_table = m_symbol_tables;
149 int string_table_index;
150 int pos_in_string_table;
151 int off = INT_MAX;
152 bool found_symbol = false;
153 while (symbol_table != NULL) {
154 if (Decoder::no_error == symbol_table->lookup(addr, &string_table_index, &pos_in_string_table, &off)) {
155 found_symbol = true;
156 }
157 symbol_table = symbol_table->m_next;
158 }
159 if (!found_symbol) return NULL;
160
161 ElfStringTable* string_table = get_string_table(string_table_index);
162 if (string_table == NULL) {
163 m_status = Decoder::file_invalid;
164 return NULL;
165 }
166 if (offset) *offset = off;
167 return string_table->string_at(pos_in_string_table);
168 }
169
170
171 void ElfFile::add_symbol_table(ElfSymbolTable* table) {
172 if (m_symbol_tables == NULL) {
173 m_symbol_tables = table;
174 } else {
175 table->m_next = m_symbol_tables;
176 m_symbol_tables = table;
177 }
178 }
179
180 void ElfFile::add_string_table(ElfStringTable* table) {
181 if (m_string_tables == NULL) {
182 m_string_tables = table;
183 } else {
184 table->m_next = m_string_tables;
185 m_string_tables = table;
186 }
187 }
188
189 ElfStringTable* ElfFile::get_string_table(int index) {
190 ElfStringTable* p = m_string_tables;
191 while (p != NULL) {
192 if (p->index() == index) return p;
193 p = p->m_next;
194 }
195 return NULL;
196 }
197
198 #endif // _WINDOWS