1 /*
2 * Copyright (c) 2012, 2019, 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/dcmd/jfrDcmds.hpp"
27 #include "jfr/instrumentation/jfrJvmtiAgent.hpp"
28 #include "jfr/jni/jfrJavaSupport.hpp"
29 #include "jfr/periodic/jfrOSInterface.hpp"
30 #include "jfr/periodic/sampling/jfrThreadSampler.hpp"
31 #include "jfr/recorder/jfrRecorder.hpp"
32 #include "jfr/recorder/checkpoint/jfrCheckpointManager.hpp"
33 #include "jfr/recorder/repository/jfrRepository.hpp"
34 #include "jfr/recorder/service/jfrOptionSet.hpp"
35 #include "jfr/recorder/service/jfrPostBox.hpp"
36 #include "jfr/recorder/service/jfrRecorderService.hpp"
37 #include "jfr/recorder/service/jfrRecorderThread.hpp"
38 #include "jfr/recorder/storage/jfrStorage.hpp"
39 #include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp"
40 #include "jfr/recorder/stringpool/jfrStringPool.hpp"
41 #include "jfr/utilities/jfrTime.hpp"
42 #include "jfr/writers/jfrJavaEventWriter.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/resourceArea.inline.hpp"
46 #include "runtime/handles.inline.hpp"
47 #include "runtime/globals_extension.hpp"
48 #include "utilities/growableArray.hpp"
49
50 bool JfrRecorder::is_disabled() {
51 // True if -XX:-FlightRecorder has been explicitly set on the
52 // command line
53 return FLAG_IS_CMDLINE(FlightRecorder) ? !FlightRecorder : false;
54 }
55
56 static bool _enabled = false;
57
58 static bool enable() {
59 assert(!_enabled, "invariant");
60 FLAG_SET_MGMT(FlightRecorder, true);
61 _enabled = FlightRecorder;
62 assert(_enabled, "invariant");
63 return _enabled;
64 }
65
66 bool JfrRecorder::is_enabled() {
67 return _enabled;
68 }
69
70 bool JfrRecorder::on_vm_init() {
71 if (!is_disabled()) {
72 if (FlightRecorder || StartFlightRecording != NULL) {
73 enable();
74 }
75 }
76 // fast time initialization
77 return JfrTime::initialize();
78 }
79
80 static GrowableArray<JfrStartFlightRecordingDCmd*>* dcmd_recordings_array = NULL;
81
82 static void release_recordings() {
83 if (dcmd_recordings_array != NULL) {
84 const int length = dcmd_recordings_array->length();
85 for (int i = 0; i < length; ++i) {
86 delete dcmd_recordings_array->at(i);
87 }
88 delete dcmd_recordings_array;
89 dcmd_recordings_array = NULL;
90 }
91 }
92
93 static void teardown_startup_support() {
94 release_recordings();
95 JfrOptionSet::release_startup_recording_options();
96 }
97
98 // Parsing options here to detect errors as soon as possible
99 static bool parse_recording_options(const char* options, JfrStartFlightRecordingDCmd* dcmd_recording, TRAPS) {
100 assert(options != NULL, "invariant");
101 assert(dcmd_recording != NULL, "invariant");
102 CmdLine cmdline(options, strlen(options), true);
103 dcmd_recording->parse(&cmdline, ',', THREAD);
104 if (HAS_PENDING_EXCEPTION) {
105 java_lang_Throwable::print(PENDING_EXCEPTION, tty);
106 CLEAR_PENDING_EXCEPTION;
107 return false;
108 }
109 return true;
110 }
111
112 static bool validate_recording_options(TRAPS) {
113 const GrowableArray<const char*>* options = JfrOptionSet::startup_recording_options();
114 if (options == NULL) {
115 return true;
116 }
117 const int length = options->length();
118 assert(length >= 1, "invariant");
119 assert(dcmd_recordings_array == NULL, "invariant");
120 dcmd_recordings_array = new (ResourceObj::C_HEAP, mtTracing)GrowableArray<JfrStartFlightRecordingDCmd*>(length, true, mtTracing);
121 assert(dcmd_recordings_array != NULL, "invariant");
122 for (int i = 0; i < length; ++i) {
123 JfrStartFlightRecordingDCmd* const dcmd_recording = new(ResourceObj::C_HEAP, mtTracing) JfrStartFlightRecordingDCmd(tty, true);
124 assert(dcmd_recording != NULL, "invariant");
125 dcmd_recordings_array->append(dcmd_recording);
126 if (!parse_recording_options(options->at(i), dcmd_recording, THREAD)) {
127 return false;
128 }
129 }
130 return true;
131 }
132
133 static bool launch_recording(JfrStartFlightRecordingDCmd* dcmd_recording, TRAPS) {
134 assert(dcmd_recording != NULL, "invariant");
135 log_trace(jfr, system)("Starting a recording");
136 dcmd_recording->execute(DCmd_Source_Internal, THREAD);
137 if (HAS_PENDING_EXCEPTION) {
138 log_debug(jfr, system)("Exception while starting a recording");
139 CLEAR_PENDING_EXCEPTION;
140 return false;
141 }
142 log_trace(jfr, system)("Finished starting a recording");
143 return true;
144 }
145
146 static bool launch_recordings(TRAPS) {
147 bool result = true;
148 if (dcmd_recordings_array != NULL) {
149 const int length = dcmd_recordings_array->length();
150 assert(length >= 1, "invariant");
151 for (int i = 0; i < length; ++i) {
152 if (!launch_recording(dcmd_recordings_array->at(i), THREAD)) {
153 result = false;
154 break;
155 }
156 }
157 }
158 teardown_startup_support();
159 return result;
160 }
161
162 static void log_jdk_jfr_module_resolution_error(TRAPS) {
163 LogTarget(Error, jfr, system) lt_error;
164 LogTargetHandle handle(lt_error);
165 LogStream stream(handle);
166 JfrJavaSupport::is_jdk_jfr_module_available(&stream, THREAD);
167 }
168
169 static bool is_cds_dump_requested() {
170 // we will not be able to launch recordings if a cds dump is being requested
171 if (Arguments::is_dumping_archive() && (JfrOptionSet::startup_recording_options() != NULL)) {
172 warning("JFR will be disabled during CDS dumping");
173 teardown_startup_support();
174 return true;
175 }
176 return false;
177 }
178
179 bool JfrRecorder::on_vm_start() {
180 if (is_cds_dump_requested()) {
181 return true;
182 }
183 Thread* const thread = Thread::current();
184 if (!JfrOptionSet::initialize(thread)) {
185 return false;
186 }
187 if (!register_jfr_dcmds()) {
188 return false;
189 }
190
191 const bool in_graph = JfrJavaSupport::is_jdk_jfr_module_available();
192
193 if (in_graph) {
194 if (!validate_recording_options(thread)) {
195 return false;
196 }
197 if (!JfrOptionSet::configure(thread)) {
198 return false;
199 }
200 }
201
202 if (!is_enabled()) {
203 return true;
204 }
205
206 if (!in_graph) {
207 log_jdk_jfr_module_resolution_error(thread);
208 return false;
209 }
210
211 return launch_recordings(thread);
212 }
213
214 static bool _created = false;
215
216 //
217 // Main entry point for starting Jfr functionality.
218 // Non-protected initializations assume single-threaded setup.
219 //
220 bool JfrRecorder::create(bool simulate_failure) {
221 assert(!is_disabled(), "invariant");
222 assert(!is_created(), "invariant");
223 if (!is_enabled()) {
224 enable();
225 }
226 if (!create_components() || simulate_failure) {
227 destroy_components();
228 return false;
229 }
230 if (!create_recorder_thread()) {
231 destroy_components();
232 return false;
233 }
234 _created = true;
235 return true;
236 }
237
238 bool JfrRecorder::is_created() {
239 return _created;
240 }
241
242 bool JfrRecorder::create_components() {
243 ResourceMark rm;
244 HandleMark hm;
245
246 if (!create_java_event_writer()) {
247 return false;
248 }
249 if (!create_jvmti_agent()) {
250 return false;
251 }
252 if (!create_post_box()) {
253 return false;
254 }
255 if (!create_chunk_repository()) {
256 return false;
257 }
258 if (!create_storage()) {
259 return false;
260 }
261 if (!create_checkpoint_manager()) {
262 return false;
263 }
264 if (!create_stacktrace_repository()) {
265 return false;
266 }
267 if (!create_os_interface()) {
268 return false;
269 }
270 if (!create_stringpool()) {
271 return false;
272 }
273 if (!create_thread_sampling()) {
274 return false;
275 }
276 return true;
277 }
278
279 // subsystems
280 static JfrJvmtiAgent* _jvmti_agent = NULL;
281 static JfrPostBox* _post_box = NULL;
282 static JfrStorage* _storage = NULL;
283 static JfrCheckpointManager* _checkpoint_manager = NULL;
284 static JfrRepository* _repository = NULL;
285 static JfrStackTraceRepository* _stack_trace_repository;
286 static JfrStringPool* _stringpool = NULL;
287 static JfrOSInterface* _os_interface = NULL;
288 static JfrThreadSampling* _thread_sampling = NULL;
289
290 bool JfrRecorder::create_java_event_writer() {
291 return JfrJavaEventWriter::initialize();
292 }
293
294 bool JfrRecorder::create_jvmti_agent() {
295 return JfrOptionSet::allow_retransforms() ? JfrJvmtiAgent::create() : true;
296 }
297
298 bool JfrRecorder::create_post_box() {
299 assert(_post_box == NULL, "invariant");
300 _post_box = JfrPostBox::create();
301 return _post_box != NULL;
302 }
303
304 bool JfrRecorder::create_chunk_repository() {
305 assert(_repository == NULL, "invariant");
306 assert(_post_box != NULL, "invariant");
307 _repository = JfrRepository::create(*_post_box);
308 return _repository != NULL && _repository->initialize();
309 }
310
311 bool JfrRecorder::create_os_interface() {
312 assert(_os_interface == NULL, "invariant");
313 _os_interface = JfrOSInterface::create();
314 return _os_interface != NULL && _os_interface->initialize();
315 }
316
317 bool JfrRecorder::create_storage() {
318 assert(_repository != NULL, "invariant");
319 assert(_post_box != NULL, "invariant");
320 _storage = JfrStorage::create(_repository->chunkwriter(), *_post_box);
321 return _storage != NULL && _storage->initialize();
322 }
323
324 bool JfrRecorder::create_checkpoint_manager() {
325 assert(_checkpoint_manager == NULL, "invariant");
326 assert(_repository != NULL, "invariant");
327 _checkpoint_manager = JfrCheckpointManager::create(_repository->chunkwriter());
328 return _checkpoint_manager != NULL && _checkpoint_manager->initialize();
329 }
330
331 bool JfrRecorder::create_stacktrace_repository() {
332 assert(_stack_trace_repository == NULL, "invariant");
333 _stack_trace_repository = JfrStackTraceRepository::create();
334 return _stack_trace_repository != NULL && _stack_trace_repository->initialize();
335 }
336
337 bool JfrRecorder::create_stringpool() {
338 assert(_stringpool == NULL, "invariant");
339 assert(_repository != NULL, "invariant");
340 _stringpool = JfrStringPool::create(_repository->chunkwriter());
341 return _stringpool != NULL && _stringpool->initialize();
342 }
343
344 bool JfrRecorder::create_thread_sampling() {
345 assert(_thread_sampling == NULL, "invariant");
346 _thread_sampling = JfrThreadSampling::create();
347 return _thread_sampling != NULL;
348 }
349
350 void JfrRecorder::destroy_components() {
351 JfrJvmtiAgent::destroy();
352 if (_post_box != NULL) {
353 JfrPostBox::destroy();
354 _post_box = NULL;
355 }
356 if (_repository != NULL) {
357 JfrRepository::destroy();
358 _repository = NULL;
359 }
360 if (_storage != NULL) {
361 JfrStorage::destroy();
362 _storage = NULL;
363 }
364 if (_checkpoint_manager != NULL) {
365 JfrCheckpointManager::destroy();
366 _checkpoint_manager = NULL;
367 }
368 if (_stack_trace_repository != NULL) {
369 JfrStackTraceRepository::destroy();
370 _stack_trace_repository = NULL;
371 }
372 if (_stringpool != NULL) {
373 JfrStringPool::destroy();
374 _stringpool = NULL;
375 }
376 if (_os_interface != NULL) {
377 JfrOSInterface::destroy();
378 _os_interface = NULL;
379 }
380 if (_thread_sampling != NULL) {
381 JfrThreadSampling::destroy();
382 _thread_sampling = NULL;
383 }
384 }
385
386 bool JfrRecorder::create_recorder_thread() {
387 return JfrRecorderThread::start(_checkpoint_manager, _post_box, Thread::current());
388 }
389
390 void JfrRecorder::destroy() {
391 assert(is_created(), "invariant");
392 _post_box->post(MSG_SHUTDOWN);
393 JfrJvmtiAgent::destroy();
394 }
395
396 void JfrRecorder::on_recorder_thread_exit() {
397 assert(!is_recording(), "invariant");
398 // intent is to destroy the recorder instance and components,
399 // but need sensitive coordination not yet in place
400 //
401 // destroy_components();
402 //
403 log_debug(jfr, system)("Recorder thread STOPPED");
404 }
405
406 void JfrRecorder::start_recording() {
407 _post_box->post(MSG_START);
408 }
409
410 bool JfrRecorder::is_recording() {
411 return JfrRecorderService::is_recording();
412 }
413
414 void JfrRecorder::stop_recording() {
415 _post_box->post(MSG_STOP);
416 }