decoder.cpp revision 3526:3b01d0321dfa 
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#include "prims/jvm.h"
27#include "runtime/mutexLocker.hpp"
28#include "runtime/os.hpp"
29#include "utilities/decoder.hpp"
30#include "utilities/vmError.hpp"
31
32#if defined(_WINDOWS)
33  #include "decoder_windows.hpp"
34#elif defined(__APPLE__)
35  #include "decoder_machO.hpp"
36#else
37  #include "decoder_elf.hpp"
38#endif
39
40AbstractDecoder*  Decoder::_shared_decoder = NULL;
41AbstractDecoder*  Decoder::_error_handler_decoder = NULL;
42NullDecoder       Decoder::_do_nothing_decoder;
43Mutex*            Decoder::_shared_decoder_lock = new Mutex(Mutex::native,
44                                "SharedDecoderLock");
45
46AbstractDecoder* Decoder::get_shared_instance() {
47  assert(_shared_decoder_lock != NULL && _shared_decoder_lock->owned_by_self(),
48    "Require DecoderLock to enter");
49
50  if (_shared_decoder == NULL) {
51    _shared_decoder = create_decoder();
52  }
53  return _shared_decoder;
54}
55
56AbstractDecoder* Decoder::get_error_handler_instance() {
57  if (_error_handler_decoder == NULL) {
58    _error_handler_decoder = create_decoder();
59  }
60  return _error_handler_decoder;
61}
62
63
64AbstractDecoder* Decoder::create_decoder() {
65  AbstractDecoder* decoder;
66#if defined(_WINDOWS)
67  decoder = new (std::nothrow) WindowsDecoder();
68#elif defined (__APPLE__)
69  decoder = new (std::nothrow)MachODecoder();
70#else
71  decoder = new (std::nothrow)ElfDecoder();
72#endif
73
74  if (decoder == NULL || decoder->has_error()) {
75    if (decoder != NULL) {
76      delete decoder;
77    }
78    decoder = &_do_nothing_decoder;
79  }
80  return decoder;
81}
82
83bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const char* modulepath) {
84  assert(_shared_decoder_lock != NULL, "Just check");
85  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
86  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
87  AbstractDecoder* decoder = error_handling_thread ?
88    get_error_handler_instance(): get_shared_instance();
89  assert(decoder != NULL, "null decoder");
90
91  return decoder->decode(addr, buf, buflen, offset, modulepath);
92}
93
94bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const void* base) {
95  assert(_shared_decoder_lock != NULL, "Just check");
96  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
97  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
98  AbstractDecoder* decoder = error_handling_thread ?
99    get_error_handler_instance(): get_shared_instance();
100  assert(decoder != NULL, "null decoder");
101
102  return decoder->decode(addr, buf, buflen, offset, base);
103}
104
105
106bool Decoder::demangle(const char* symbol, char* buf, int buflen) {
107  assert(_shared_decoder_lock != NULL, "Just check");
108  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
109  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
110  AbstractDecoder* decoder = error_handling_thread ?
111    get_error_handler_instance(): get_shared_instance();
112  assert(decoder != NULL, "null decoder");
113  return decoder->demangle(symbol, buf, buflen);
114}
115
116bool Decoder::can_decode_C_frame_in_vm() {
117  assert(_shared_decoder_lock != NULL, "Just check");
118  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
119  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
120  AbstractDecoder* decoder = error_handling_thread ?
121    get_error_handler_instance(): get_shared_instance();
122  assert(decoder != NULL, "null decoder");
123  return decoder->can_decode_C_frame_in_vm();
124}
125
126/*
127 * Shutdown shared decoder and replace it with
128 * _do_nothing_decoder. Do nothing with error handler
129 * instance, since the JVM is going down.
130 */
131void Decoder::shutdown() {
132  assert(_shared_decoder_lock != NULL, "Just check");
133  MutexLockerEx locker(_shared_decoder_lock, true);
134
135  if (_shared_decoder != NULL &&
136    _shared_decoder != &_do_nothing_decoder) {
137    delete _shared_decoder;
138  }
139
140  _shared_decoder = &_do_nothing_decoder;
141}
142
143