decoder.cpp revision 5965:bdd155477289 
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/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#elif defined(AIX)
37  #include "decoder_aix.hpp"
38#else
39  #include "decoder_elf.hpp"
40#endif
41
42AbstractDecoder*  Decoder::_shared_decoder = NULL;
43AbstractDecoder*  Decoder::_error_handler_decoder = NULL;
44NullDecoder       Decoder::_do_nothing_decoder;
45Mutex*            Decoder::_shared_decoder_lock = new Mutex(Mutex::native,
46                                "SharedDecoderLock");
47
48AbstractDecoder* Decoder::get_shared_instance() {
49  assert(_shared_decoder_lock != NULL && _shared_decoder_lock->owned_by_self(),
50    "Require DecoderLock to enter");
51
52  if (_shared_decoder == NULL) {
53    _shared_decoder = create_decoder();
54  }
55  return _shared_decoder;
56}
57
58AbstractDecoder* Decoder::get_error_handler_instance() {
59  if (_error_handler_decoder == NULL) {
60    _error_handler_decoder = create_decoder();
61  }
62  return _error_handler_decoder;
63}
64
65
66AbstractDecoder* Decoder::create_decoder() {
67  AbstractDecoder* decoder;
68#if defined(_WINDOWS)
69  decoder = new (std::nothrow) WindowsDecoder();
70#elif defined (__APPLE__)
71  decoder = new (std::nothrow)MachODecoder();
72#elif defined(AIX)
73  decoder = new (std::nothrow)AIXDecoder();
74#else
75  decoder = new (std::nothrow)ElfDecoder();
76#endif
77
78  if (decoder == NULL || decoder->has_error()) {
79    if (decoder != NULL) {
80      delete decoder;
81    }
82    decoder = &_do_nothing_decoder;
83  }
84  return decoder;
85}
86
87bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const char* modulepath) {
88  assert(_shared_decoder_lock != NULL, "Just check");
89  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
90  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
91  AbstractDecoder* decoder = error_handling_thread ?
92    get_error_handler_instance(): get_shared_instance();
93  assert(decoder != NULL, "null decoder");
94
95  return decoder->decode(addr, buf, buflen, offset, modulepath);
96}
97
98bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const void* base) {
99  assert(_shared_decoder_lock != NULL, "Just check");
100  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
101  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
102  AbstractDecoder* decoder = error_handling_thread ?
103    get_error_handler_instance(): get_shared_instance();
104  assert(decoder != NULL, "null decoder");
105
106  return decoder->decode(addr, buf, buflen, offset, base);
107}
108
109
110bool Decoder::demangle(const char* symbol, char* buf, int buflen) {
111  assert(_shared_decoder_lock != NULL, "Just check");
112  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
113  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
114  AbstractDecoder* decoder = error_handling_thread ?
115    get_error_handler_instance(): get_shared_instance();
116  assert(decoder != NULL, "null decoder");
117  return decoder->demangle(symbol, buf, buflen);
118}
119
120bool Decoder::can_decode_C_frame_in_vm() {
121  assert(_shared_decoder_lock != NULL, "Just check");
122  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
123  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
124  AbstractDecoder* decoder = error_handling_thread ?
125    get_error_handler_instance(): get_shared_instance();
126  assert(decoder != NULL, "null decoder");
127  return decoder->can_decode_C_frame_in_vm();
128}
129
130/*
131 * Shutdown shared decoder and replace it with
132 * _do_nothing_decoder. Do nothing with error handler
133 * instance, since the JVM is going down.
134 */
135void Decoder::shutdown() {
136  assert(_shared_decoder_lock != NULL, "Just check");
137  MutexLockerEx locker(_shared_decoder_lock, true);
138
139  if (_shared_decoder != NULL &&
140    _shared_decoder != &_do_nothing_decoder) {
141    delete _shared_decoder;
142  }
143
144  _shared_decoder = &_do_nothing_decoder;
145}
146
147