1 /*
2 * Copyright (c) 2016, 2018, 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 "jfr/metadata/jfrSerializer.hpp"
27 #include "jfr/recorder/checkpoint/jfrCheckpointWriter.hpp"
28 #include "jfr/recorder/checkpoint/types/jfrType.hpp"
29 #include "jfr/recorder/checkpoint/types/jfrTypeManager.hpp"
30 #include "jfr/utilities/jfrDoublyLinkedList.hpp"
31 #include "jfr/utilities/jfrIterator.hpp"
32 #include "runtime/safepoint.hpp"
33 #include "runtime/thread.inline.hpp"
34 #include "utilities/exceptions.hpp"
35 #include "runtime/semaphore.hpp"
36
37 class JfrSerializerRegistration : public JfrCHeapObj {
38 private:
39 JfrSerializerRegistration* _next;
40 JfrSerializerRegistration* _prev;
41 JfrSerializer* _serializer;
42 mutable JfrCheckpointBlobHandle _cache;
43 JfrTypeId _id;
44 bool _permit_cache;
45
46 public:
47 JfrSerializerRegistration(JfrTypeId id, bool permit_cache, JfrSerializer* serializer) :
48 _next(NULL), _prev(NULL), _serializer(serializer), _cache(), _id(id), _permit_cache(permit_cache) {}
49
50 ~JfrSerializerRegistration() {
51 delete _serializer;
52 }
53
54 JfrSerializerRegistration* next() const {
55 return _next;
56 }
57
58 void set_next(JfrSerializerRegistration* next) {
59 _next = next;
60 }
61
62 JfrSerializerRegistration* prev() const {
63 return _prev;
64 }
65
66 void set_prev(JfrSerializerRegistration* prev) {
67 _prev = prev;
68 }
69
70 JfrTypeId id() const {
71 return _id;
72 }
73
74 void invoke(JfrCheckpointWriter& writer) const;
75 };
76
77 void JfrSerializerRegistration::invoke(JfrCheckpointWriter& writer) const {
78 if (_cache.valid()) {
79 writer.increment();
80 _cache->write(writer);
81 return;
82 }
83 const JfrCheckpointContext ctx = writer.context();
84 // serialize the type id before invoking callback
85 writer.write_type(_id);
86 const intptr_t start = writer.current_offset();
87 // invoke the serializer routine
88 _serializer->serialize(writer);
89 if (start == writer.current_offset() ) {
90 // the serializer implementation did nothing, rewind to restore
91 writer.set_context(ctx);
92 return;
93 }
94 if (_permit_cache) {
95 _cache = writer.copy(&ctx);
96 }
97 }
98
99 class SerializerRegistrationGuard : public StackObj {
100 private:
101 static Semaphore _mutex_semaphore;
102 public:
103 SerializerRegistrationGuard() {
104 _mutex_semaphore.wait();
105 }
106 ~SerializerRegistrationGuard() {
107 _mutex_semaphore.signal();
108 }
109 };
110
111 Semaphore SerializerRegistrationGuard::_mutex_semaphore(1);
112
113 typedef JfrDoublyLinkedList<JfrSerializerRegistration> List;
114 typedef StopOnNullIterator<const List> Iterator;
115 static List types;
116 static List safepoint_types;
117
118 void JfrTypeManager::clear() {
119 SerializerRegistrationGuard guard;
120 Iterator iter(types);
121 JfrSerializerRegistration* registration;
122 while (iter.has_next()) {
123 registration = types.remove(iter.next());
124 assert(registration != NULL, "invariant");
125 delete registration;
126 }
127 Iterator sp_type_iter(safepoint_types);
128 while (sp_type_iter.has_next()) {
129 registration = safepoint_types.remove(sp_type_iter.next());
130 assert(registration != NULL, "invariant");
131 delete registration;
132 }
133 }
134
135 void JfrTypeManager::write_types(JfrCheckpointWriter& writer) {
136 const Iterator iter(types);
137 while (iter.has_next()) {
138 iter.next()->invoke(writer);
139 }
140 }
141
142 void JfrTypeManager::write_safepoint_types(JfrCheckpointWriter& writer) {
143 assert(SafepointSynchronize::is_at_safepoint(), "invariant");
144 const Iterator iter(safepoint_types);
145 while (iter.has_next()) {
146 iter.next()->invoke(writer);
147 }
148 }
149
150 void JfrTypeManager::write_type_set() {
151 // can safepoint here because of Module_lock
152 MutexLockerEx cld_lock(SafepointSynchronize::is_at_safepoint() ? NULL : ClassLoaderDataGraph_lock);
153 MutexLockerEx lock(SafepointSynchronize::is_at_safepoint() ? NULL : Module_lock);
154
155 JfrCheckpointWriter writer(true, true, Thread::current());
156 TypeSet set;
157 set.serialize(writer);
158 }
159
160 void JfrTypeManager::write_type_set_for_unloaded_classes() {
161 assert(SafepointSynchronize::is_at_safepoint(), "invariant");
162 JfrCheckpointWriter writer(false, true, Thread::current());
163 ClassUnloadTypeSet class_unload_set;
164 class_unload_set.serialize(writer);
165 }
166
167 void JfrTypeManager::create_thread_checkpoint(JavaThread* jt) {
168 assert(jt != NULL, "invariant");
169 JfrThreadConstant type_thread(jt);
170 JfrCheckpointWriter writer(false, true, jt);
171 writer.write_type(TYPE_THREAD);
172 type_thread.serialize(writer);
173 // create and install a checkpoint blob
174 jt->jfr_thread_local()->set_thread_checkpoint(writer.checkpoint_blob());
175 assert(jt->jfr_thread_local()->has_thread_checkpoint(), "invariant");
176 }
177
178 void JfrTypeManager::write_thread_checkpoint(JavaThread* jt) {
179 assert(jt != NULL, "JavaThread is NULL!");
180 ResourceMark rm(jt);
181 if (jt->jfr_thread_local()->has_thread_checkpoint()) {
182 JfrCheckpointWriter writer(false, false, jt);
183 jt->jfr_thread_local()->thread_checkpoint()->write(writer);
184 } else {
185 JfrThreadConstant type_thread(jt);
186 JfrCheckpointWriter writer(false, true, jt);
187 writer.write_type(TYPE_THREAD);
188 type_thread.serialize(writer);
189 }
190 }
191
192 #ifdef ASSERT
193 static void assert_not_registered_twice(JfrTypeId id, List& list) {
194 const Iterator iter(list);
195 while (iter.has_next()) {
196 assert(iter.next()->id() != id, "invariant");
197 }
198 }
199 #endif
200
201 static bool register_type(JfrTypeId id, bool require_safepoint, bool permit_cache, JfrSerializer* serializer) {
202 assert(serializer != NULL, "invariant");
203 JfrSerializerRegistration* const registration = new JfrSerializerRegistration(id, permit_cache, serializer);
204 if (registration == NULL) {
205 delete serializer;
206 return false;
207 }
208 if (require_safepoint) {
209 assert(!safepoint_types.in_list(registration), "invariant");
210 DEBUG_ONLY(assert_not_registered_twice(id, safepoint_types);)
211 safepoint_types.prepend(registration);
212 } else {
213 assert(!types.in_list(registration), "invariant");
214 DEBUG_ONLY(assert_not_registered_twice(id, types);)
215 types.prepend(registration);
216 }
217 return true;
218 }
219
220 bool JfrTypeManager::initialize() {
221 SerializerRegistrationGuard guard;
222
223 // register non-safepointing type serialization
224 register_type(TYPE_FLAGVALUEORIGIN, false, true, new FlagValueOriginConstant());
225 register_type(TYPE_INFLATECAUSE, false, true, new MonitorInflateCauseConstant());
226 register_type(TYPE_GCCAUSE, false, true, new GCCauseConstant());
227 register_type(TYPE_GCNAME, false, true, new GCNameConstant());
228 register_type(TYPE_GCWHEN, false, true, new GCWhenConstant());
229 register_type(TYPE_G1HEAPREGIONTYPE, false, true, new G1HeapRegionTypeConstant());
230 register_type(TYPE_GCTHRESHOLDUPDATER, false, true, new GCThresholdUpdaterConstant());
231 register_type(TYPE_METADATATYPE, false, true, new MetadataTypeConstant());
232 register_type(TYPE_METASPACEOBJECTTYPE, false, true, new MetaspaceObjectTypeConstant());
233 register_type(TYPE_G1YCTYPE, false, true, new G1YCTypeConstant());
234 register_type(TYPE_REFERENCETYPE, false, true, new ReferenceTypeConstant());
235 register_type(TYPE_NARROWOOPMODE, false, true, new NarrowOopModeConstant());
236 register_type(TYPE_COMPILERPHASETYPE, false, true, new CompilerPhaseTypeConstant());
237 register_type(TYPE_CODEBLOBTYPE, false, true, new CodeBlobTypeConstant());
238 register_type(TYPE_VMOPERATIONTYPE, false, true, new VMOperationTypeConstant());
239 register_type(TYPE_THREADSTATE, false, true, new ThreadStateConstant());
240
241 // register safepointing type serialization
242 register_type(TYPE_THREADGROUP, true, false, new JfrThreadGroupConstant());
243 register_type(TYPE_THREAD, true, false, new JfrThreadConstantSet());
244 return true;
245 }
246
247 // implementation for the static registration function exposed in the JfrSerializer api
248 bool JfrSerializer::register_serializer(JfrTypeId id, bool require_safepoint, bool permit_cache, JfrSerializer* serializer) {
249 SerializerRegistrationGuard guard;
250 return register_type(id, require_safepoint, permit_cache, serializer);
251 }