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 #ifndef _WINDOWS
32 #if defined(__APPLE__)
33 #include "decoder_machO.hpp"
34 #elif defined(AIX)
35 #include "decoder_aix.hpp"
36 #else
37 #include "decoder_elf.hpp"
38 #endif
39
40 AbstractDecoder* Decoder::_shared_decoder = NULL;
41 AbstractDecoder* Decoder::_error_handler_decoder = NULL;
42 NullDecoder Decoder::_do_nothing_decoder;
43 Mutex* Decoder::_shared_decoder_lock = new Mutex(Mutex::native,
44 "SharedDecoderLock",
45 false,
46 Monitor::_safepoint_check_never);
47
48 AbstractDecoder* 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
58 AbstractDecoder* 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
66 AbstractDecoder* Decoder::create_decoder() {
67 AbstractDecoder* decoder;
68 #if defined (__APPLE__)
69 decoder = new (std::nothrow)MachODecoder();
70 #elif defined(AIX)
71 decoder = new (std::nothrow)AIXDecoder();
72 #else
73 decoder = new (std::nothrow)ElfDecoder();
74 #endif
75
76 if (decoder == NULL || decoder->has_error()) {
77 if (decoder != NULL) {
78 delete decoder;
79 }
80 decoder = &_do_nothing_decoder;
81 }
82 return decoder;
83 }
84
85 inline bool DecoderLocker::is_first_error_thread() {
86 return (os::current_thread_id() == VMError::get_first_error_tid());
87 }
88
89 DecoderLocker::DecoderLocker() :
90 MutexLockerEx(DecoderLocker::is_first_error_thread() ?
91 NULL : Decoder::shared_decoder_lock(), true) {
92 _decoder = is_first_error_thread() ?
93 Decoder::get_error_handler_instance() : Decoder::get_shared_instance();
94 assert(_decoder != NULL, "null decoder");
95 }
96
97 Mutex* Decoder::shared_decoder_lock() {
98 assert(_shared_decoder_lock != NULL, "Just check");
99 return _shared_decoder_lock;
100 }
101
102 bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const char* modulepath, bool demangle) {
103 assert(_shared_decoder_lock != NULL, "Just check");
104 bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
105 MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
106 AbstractDecoder* decoder = error_handling_thread ?
107 get_error_handler_instance(): get_shared_instance();
108 assert(decoder != NULL, "null decoder");
109
110 return decoder->decode(addr, buf, buflen, offset, modulepath, demangle);
111 }
112
113 bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const void* base) {
114 assert(_shared_decoder_lock != NULL, "Just check");
115 bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
116 MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
117 AbstractDecoder* decoder = error_handling_thread ?
118 get_error_handler_instance(): get_shared_instance();
119 assert(decoder != NULL, "null decoder");
120
121 return decoder->decode(addr, buf, buflen, offset, base);
122 }
123
124
125 bool Decoder::demangle(const char* symbol, char* buf, int buflen) {
126 assert(_shared_decoder_lock != NULL, "Just check");
127 bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
128 MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
129 AbstractDecoder* decoder = error_handling_thread ?
130 get_error_handler_instance(): get_shared_instance();
131 assert(decoder != NULL, "null decoder");
132 return decoder->demangle(symbol, buf, buflen);
133 }
134
135 void Decoder::print_state_on(outputStream* st) {
136 }
137
138 bool Decoder::get_source_info(address pc, char* buf, size_t buflen, int* line) {
139 return false;
140 }
141
142 #endif // !_WINDOWS
143