decoder.cpp revision 8550:b8a3be10a4ed 
1/*
2 * Copyright (c) 1997, 2015, 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                                false,
47                                Monitor::_safepoint_check_never);
48
49AbstractDecoder* Decoder::get_shared_instance() {
50  assert(_shared_decoder_lock != NULL && _shared_decoder_lock->owned_by_self(),
51    "Require DecoderLock to enter");
52
53  if (_shared_decoder == NULL) {
54    _shared_decoder = create_decoder();
55  }
56  return _shared_decoder;
57}
58
59AbstractDecoder* Decoder::get_error_handler_instance() {
60  if (_error_handler_decoder == NULL) {
61    _error_handler_decoder = create_decoder();
62  }
63  return _error_handler_decoder;
64}
65
66
67AbstractDecoder* Decoder::create_decoder() {
68  AbstractDecoder* decoder;
69#if defined(_WINDOWS)
70  decoder = new (std::nothrow) WindowsDecoder();
71#elif defined (__APPLE__)
72  decoder = new (std::nothrow)MachODecoder();
73#elif defined(AIX)
74  decoder = new (std::nothrow)AIXDecoder();
75#else
76  decoder = new (std::nothrow)ElfDecoder();
77#endif
78
79  if (decoder == NULL || decoder->has_error()) {
80    if (decoder != NULL) {
81      delete decoder;
82    }
83    decoder = &_do_nothing_decoder;
84  }
85  return decoder;
86}
87
88inline bool DecoderLocker::is_first_error_thread() {
89  return (os::current_thread_id() == VMError::get_first_error_tid());
90}
91
92DecoderLocker::DecoderLocker() :
93  MutexLockerEx(DecoderLocker::is_first_error_thread() ?
94                NULL : Decoder::shared_decoder_lock(), true) {
95  _decoder = is_first_error_thread() ?
96    Decoder::get_error_handler_instance() : Decoder::get_shared_instance();
97  assert(_decoder != NULL, "null decoder");
98}
99
100Mutex* Decoder::shared_decoder_lock() {
101  assert(_shared_decoder_lock != NULL, "Just check");
102  return _shared_decoder_lock;
103}
104
105bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const char* modulepath, bool demangle) {
106  assert(_shared_decoder_lock != NULL, "Just check");
107  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
108  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
109  AbstractDecoder* decoder = error_handling_thread ?
110    get_error_handler_instance(): get_shared_instance();
111  assert(decoder != NULL, "null decoder");
112
113  return decoder->decode(addr, buf, buflen, offset, modulepath, demangle);
114}
115
116bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const void* base) {
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
124  return decoder->decode(addr, buf, buflen, offset, base);
125}
126
127
128bool Decoder::demangle(const char* symbol, char* buf, int buflen) {
129  assert(_shared_decoder_lock != NULL, "Just check");
130  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
131  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
132  AbstractDecoder* decoder = error_handling_thread ?
133    get_error_handler_instance(): get_shared_instance();
134  assert(decoder != NULL, "null decoder");
135  return decoder->demangle(symbol, buf, buflen);
136}
137
138bool Decoder::can_decode_C_frame_in_vm() {
139  assert(_shared_decoder_lock != NULL, "Just check");
140  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
141  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
142  AbstractDecoder* decoder = error_handling_thread ?
143    get_error_handler_instance(): get_shared_instance();
144  assert(decoder != NULL, "null decoder");
145  return decoder->can_decode_C_frame_in_vm();
146}
147
148/*
149 * Shutdown shared decoder and replace it with
150 * _do_nothing_decoder. Do nothing with error handler
151 * instance, since the JVM is going down.
152 */
153void Decoder::shutdown() {
154  assert(_shared_decoder_lock != NULL, "Just check");
155  MutexLockerEx locker(_shared_decoder_lock, true);
156
157  if (_shared_decoder != NULL &&
158    _shared_decoder != &_do_nothing_decoder) {
159    delete _shared_decoder;
160  }
161
162  _shared_decoder = &_do_nothing_decoder;
163}
164
165