1 /*
2 * Copyright (c) 1997, 2017, 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 #include "windbghelp.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
42 AbstractDecoder* Decoder::_shared_decoder = NULL;
43 AbstractDecoder* Decoder::_error_handler_decoder = NULL;
44 NullDecoder Decoder::_do_nothing_decoder;
45 Mutex* Decoder::_shared_decoder_lock = new Mutex(Mutex::native,
46 "SharedDecoderLock",
47 false,
48 Monitor::_safepoint_check_never);
49
50 AbstractDecoder* Decoder::get_shared_instance() {
51 assert(_shared_decoder_lock != NULL && _shared_decoder_lock->owned_by_self(),
52 "Require DecoderLock to enter");
53
54 if (_shared_decoder == NULL) {
55 _shared_decoder = create_decoder();
56 }
57 return _shared_decoder;
58 }
59
60 AbstractDecoder* Decoder::get_error_handler_instance() {
61 if (_error_handler_decoder == NULL) {
62 _error_handler_decoder = create_decoder();
63 }
64 return _error_handler_decoder;
65 }
66
67
68 AbstractDecoder* Decoder::create_decoder() {
69 AbstractDecoder* decoder;
70 #if defined(_WINDOWS)
71 decoder = new (std::nothrow) WindowsDecoder();
72 #elif defined (__APPLE__)
73 decoder = new (std::nothrow)MachODecoder();
74 #elif defined(AIX)
75 decoder = new (std::nothrow)AIXDecoder();
76 #else
77 decoder = new (std::nothrow)ElfDecoder();
78 #endif
79
80 if (decoder == NULL || decoder->has_error()) {
81 if (decoder != NULL) {
82 delete decoder;
83 }
84 decoder = &_do_nothing_decoder;
85 }
86 return decoder;
87 }
88
89 inline bool DecoderLocker::is_first_error_thread() {
90 return (os::current_thread_id() == VMError::get_first_error_tid());
91 }
92
93 DecoderLocker::DecoderLocker() :
94 MutexLockerEx(DecoderLocker::is_first_error_thread() ?
95 NULL : Decoder::shared_decoder_lock(), true) {
96 _decoder = is_first_error_thread() ?
97 Decoder::get_error_handler_instance() : Decoder::get_shared_instance();
98 assert(_decoder != NULL, "null decoder");
99 }
100
101 Mutex* Decoder::shared_decoder_lock() {
102 assert(_shared_decoder_lock != NULL, "Just check");
103 return _shared_decoder_lock;
104 }
105
106 bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const char* modulepath, bool demangle) {
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
114 return decoder->decode(addr, buf, buflen, offset, modulepath, demangle);
115 }
116
117 bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const void* base) {
118 assert(_shared_decoder_lock != NULL, "Just check");
119 bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
120 MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
121 AbstractDecoder* decoder = error_handling_thread ?
122 get_error_handler_instance(): get_shared_instance();
123 assert(decoder != NULL, "null decoder");
124
125 return decoder->decode(addr, buf, buflen, offset, base);
126 }
127
128
129 bool Decoder::demangle(const char* symbol, char* buf, int buflen) {
130 assert(_shared_decoder_lock != NULL, "Just check");
131 bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
132 MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
133 AbstractDecoder* decoder = error_handling_thread ?
134 get_error_handler_instance(): get_shared_instance();
135 assert(decoder != NULL, "null decoder");
136 return decoder->demangle(symbol, buf, buflen);
137 }
138
139 bool Decoder::can_decode_C_frame_in_vm() {
140 assert(_shared_decoder_lock != NULL, "Just check");
141 bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
142 MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
143 AbstractDecoder* decoder = error_handling_thread ?
144 get_error_handler_instance(): get_shared_instance();
145 assert(decoder != NULL, "null decoder");
146 return decoder->can_decode_C_frame_in_vm();
147 }
148
149 /*
150 * Shutdown shared decoder and replace it with
151 * _do_nothing_decoder. Do nothing with error handler
152 * instance, since the JVM is going down.
153 */
154 void Decoder::shutdown() {
155 assert(_shared_decoder_lock != NULL, "Just check");
156 MutexLockerEx locker(_shared_decoder_lock, true);
157
158 if (_shared_decoder != NULL &&
159 _shared_decoder != &_do_nothing_decoder) {
160 delete _shared_decoder;
161 }
162
163 _shared_decoder = &_do_nothing_decoder;
164 }
165
166 void Decoder::print_state_on(outputStream* st) {
167 #ifdef _WINDOWS
168 WindowsDbgHelp::print_state_on(st);
169 #endif
170 }
171