decoder.cpp revision 5976:2b8e28fdf503 
1/*
2 * Copyright (c) 1997, 2012, 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/os.hpp"
28#include "utilities/decoder.hpp"
29#include "utilities/vmError.hpp"
30
31#if defined(_WINDOWS)
32  #include "decoder_windows.hpp"
33#elif defined(__APPLE__)
34  #include "decoder_machO.hpp"
35#elif defined(AIX)
36  #include "decoder_aix.hpp"
37#else
38  #include "decoder_elf.hpp"
39#endif
40
41AbstractDecoder*  Decoder::_shared_decoder = NULL;
42AbstractDecoder*  Decoder::_error_handler_decoder = NULL;
43NullDecoder       Decoder::_do_nothing_decoder;
44Mutex*            Decoder::_shared_decoder_lock = new Mutex(Mutex::native,
45                                "SharedDecoderLock");
46
47AbstractDecoder* Decoder::get_shared_instance() {
48  assert(_shared_decoder_lock != NULL && _shared_decoder_lock->owned_by_self(),
49    "Require DecoderLock to enter");
50
51  if (_shared_decoder == NULL) {
52    _shared_decoder = create_decoder();
53  }
54  return _shared_decoder;
55}
56
57AbstractDecoder* Decoder::get_error_handler_instance() {
58  if (_error_handler_decoder == NULL) {
59    _error_handler_decoder = create_decoder();
60  }
61  return _error_handler_decoder;
62}
63
64
65AbstractDecoder* Decoder::create_decoder() {
66  AbstractDecoder* decoder;
67#if defined(_WINDOWS)
68  decoder = new (std::nothrow) WindowsDecoder();
69#elif defined (__APPLE__)
70  decoder = new (std::nothrow)MachODecoder();
71#elif defined(AIX)
72  decoder = new (std::nothrow)AIXDecoder();
73#else
74  decoder = new (std::nothrow)ElfDecoder();
75#endif
76
77  if (decoder == NULL || decoder->has_error()) {
78    if (decoder != NULL) {
79      delete decoder;
80    }
81    decoder = &_do_nothing_decoder;
82  }
83  return decoder;
84}
85
86inline bool DecoderLocker::is_first_error_thread() {
87  return (os::current_thread_id() == VMError::get_first_error_tid());
88}
89
90DecoderLocker::DecoderLocker() :
91  MutexLockerEx(DecoderLocker::is_first_error_thread() ?
92                NULL : Decoder::shared_decoder_lock(), true) {
93  _decoder = is_first_error_thread() ?
94    Decoder::get_error_handler_instance() : Decoder::get_shared_instance();
95  assert(_decoder != NULL, "null decoder");
96}
97
98Mutex* Decoder::shared_decoder_lock() {
99  assert(_shared_decoder_lock != NULL, "Just check");
100  return _shared_decoder_lock;
101}
102
103bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const char* modulepath) {
104  assert(_shared_decoder_lock != NULL, "Just check");
105  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
106  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
107  AbstractDecoder* decoder = error_handling_thread ?
108    get_error_handler_instance(): get_shared_instance();
109  assert(decoder != NULL, "null decoder");
110
111  return decoder->decode(addr, buf, buflen, offset, modulepath);
112}
113
114bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const void* base) {
115  assert(_shared_decoder_lock != NULL, "Just check");
116  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
117  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
118  AbstractDecoder* decoder = error_handling_thread ?
119    get_error_handler_instance(): get_shared_instance();
120  assert(decoder != NULL, "null decoder");
121
122  return decoder->decode(addr, buf, buflen, offset, base);
123}
124
125
126bool Decoder::demangle(const char* symbol, char* buf, int buflen) {
127  assert(_shared_decoder_lock != NULL, "Just check");
128  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
129  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
130  AbstractDecoder* decoder = error_handling_thread ?
131    get_error_handler_instance(): get_shared_instance();
132  assert(decoder != NULL, "null decoder");
133  return decoder->demangle(symbol, buf, buflen);
134}
135
136bool Decoder::can_decode_C_frame_in_vm() {
137  assert(_shared_decoder_lock != NULL, "Just check");
138  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
139  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
140  AbstractDecoder* decoder = error_handling_thread ?
141    get_error_handler_instance(): get_shared_instance();
142  assert(decoder != NULL, "null decoder");
143  return decoder->can_decode_C_frame_in_vm();
144}
145
146/*
147 * Shutdown shared decoder and replace it with
148 * _do_nothing_decoder. Do nothing with error handler
149 * instance, since the JVM is going down.
150 */
151void Decoder::shutdown() {
152  assert(_shared_decoder_lock != NULL, "Just check");
153  MutexLockerEx locker(_shared_decoder_lock, true);
154
155  if (_shared_decoder != NULL &&
156    _shared_decoder != &_do_nothing_decoder) {
157    delete _shared_decoder;
158  }
159
160  _shared_decoder = &_do_nothing_decoder;
161}
162
163