1 /*
2 * Copyright (c) 2003, 2022, 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 "classfile/javaClasses.inline.hpp"
27 #include "classfile/moduleEntry.hpp"
28 #include "classfile/vmClasses.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/pcDesc.hpp"
32 #include "code/scopeDesc.hpp"
33 #include "gc/shared/oopStorageSet.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "jvmtifiles/jvmtiEnv.hpp"
36 #include "logging/log.hpp"
37 #include "logging/logStream.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "memory/universe.hpp"
41 #include "oops/klass.inline.hpp"
42 #include "oops/objArrayKlass.hpp"
43 #include "oops/objArrayOop.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "oops/oopHandle.inline.hpp"
46 #include "prims/jvmtiCodeBlobEvents.hpp"
47 #include "prims/jvmtiEventController.hpp"
48 #include "prims/jvmtiEventController.inline.hpp"
49 #include "prims/jvmtiExport.hpp"
50 #include "prims/jvmtiImpl.hpp"
51 #include "prims/jvmtiManageCapabilities.hpp"
52 #include "prims/jvmtiRawMonitor.hpp"
53 #include "prims/jvmtiRedefineClasses.hpp"
54 #include "prims/jvmtiTagMap.hpp"
55 #include "prims/jvmtiThreadState.inline.hpp"
56 #include "runtime/arguments.hpp"
57 #include "runtime/fieldDescriptor.inline.hpp"
58 #include "runtime/handles.inline.hpp"
59 #include "runtime/interfaceSupport.inline.hpp"
60 #include "runtime/javaCalls.hpp"
61 #include "runtime/javaThread.hpp"
62 #include "runtime/jniHandles.inline.hpp"
63 #include "runtime/keepStackGCProcessed.hpp"
64 #include "runtime/objectMonitor.hpp"
65 #include "runtime/objectMonitor.inline.hpp"
66 #include "runtime/os.hpp"
67 #include "runtime/osThread.hpp"
68 #include "runtime/safepointVerifiers.hpp"
69 #include "runtime/serviceThread.hpp"
70 #include "runtime/threads.hpp"
71 #include "runtime/threadSMR.hpp"
72 #include "runtime/vframe.inline.hpp"
73 #include "runtime/vm_version.hpp"
74 #include "utilities/macros.hpp"
75
76 #ifdef JVMTI_TRACE
77 #define EVT_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_SENT) != 0) { SafeResourceMark rm; log_trace(jvmti) out; }
78 #define EVT_TRIG_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_TRIGGER) != 0) { SafeResourceMark rm; log_trace(jvmti) out; }
79 #else
80 #define EVT_TRIG_TRACE(evt,out)
81 #define EVT_TRACE(evt,out)
82 #endif
83
84 ///////////////////////////////////////////////////////////////
85 //
86 // JvmtiEventTransition
87 //
88 // TO DO --
89 // more handle purging
90
91 // Use this for JavaThreads and state is _thread_in_vm.
92 class JvmtiJavaThreadEventTransition : StackObj {
93 private:
94 ResourceMark _rm;
95 ThreadToNativeFromVM _transition;
96 HandleMark _hm;
97
98 public:
99 JvmtiJavaThreadEventTransition(JavaThread *thread) :
100 _rm(),
101 _transition(thread),
102 _hm(thread) {};
103 };
104
105 // For JavaThreads which are not in _thread_in_vm state
106 // and other system threads use this.
107 class JvmtiThreadEventTransition : StackObj {
108 private:
109 ResourceMark _rm;
110 HandleMark _hm;
111 JavaThreadState _saved_state;
112 JavaThread *_jthread;
113
114 public:
115 JvmtiThreadEventTransition(Thread *thread) : _rm(), _hm(thread) {
116 if (thread->is_Java_thread()) {
117 _jthread = JavaThread::cast(thread);
118 _saved_state = _jthread->thread_state();
119 if (_saved_state == _thread_in_Java) {
120 ThreadStateTransition::transition_from_java(_jthread, _thread_in_native);
121 } else {
122 ThreadStateTransition::transition_from_vm(_jthread, _thread_in_native);
123 }
124 } else {
125 _jthread = NULL;
126 }
127 }
128
129 ~JvmtiThreadEventTransition() {
130 if (_jthread != NULL)
131 ThreadStateTransition::transition_from_native(_jthread, _saved_state);
132 }
133 };
134
135
136 ///////////////////////////////////////////////////////////////
137 //
138 // JvmtiEventMark
139 //
140
141 class JvmtiEventMark : public StackObj {
142 private:
143 JavaThread *_thread;
144 JNIEnv* _jni_env;
145 JvmtiThreadState::ExceptionState _saved_exception_state;
146
147 public:
148 JvmtiEventMark(JavaThread *thread) : _thread(thread),
149 _jni_env(thread->jni_environment()),
150 _saved_exception_state(JvmtiThreadState::ES_CLEARED) {
151 JvmtiThreadState *state = thread->jvmti_thread_state();
152 // we are before an event.
153 // Save current jvmti thread exception state.
154 if (state != NULL) {
155 _saved_exception_state = state->get_exception_state();
156 }
157
158 thread->push_jni_handle_block();
159 assert(thread == JavaThread::current(), "thread must be current!");
160 thread->frame_anchor()->make_walkable();
161 };
162
163 ~JvmtiEventMark() {
164 _thread->pop_jni_handle_block();
165
166 JvmtiThreadState* state = _thread->jvmti_thread_state();
167 // we are continuing after an event.
168 if (state != NULL) {
169 // Restore the jvmti thread exception state.
170 state->restore_exception_state(_saved_exception_state);
171 }
172 }
173
174 jobject to_jobject(oop obj) { return JNIHandles::make_local(_thread,obj); }
175
176 jclass to_jclass(Klass* klass) { return (klass == NULL ? NULL : (jclass)to_jobject(klass->java_mirror())); }
177
178 jmethodID to_jmethodID(const methodHandle& method) { return method->jmethod_id(); }
179
180 JNIEnv* jni_env() { return _jni_env; }
181 };
182
183 class JvmtiThreadEventMark : public JvmtiEventMark {
184 private:
185 jobject _jthread;
186
187 public:
188 JvmtiThreadEventMark(JavaThread *thread) :
189 JvmtiEventMark(thread) {
190 _jthread = to_jobject(thread->threadObj());
191 };
192 jthread jni_thread() { return (jthread)_jthread; }
193 };
194
195 class JvmtiVirtualThreadEventMark : public JvmtiEventMark {
196 private:
197 jobject _jthread;
198
199 public:
200 JvmtiVirtualThreadEventMark(JavaThread *thread) :
201 JvmtiEventMark(thread) {
202 assert(thread->vthread() != NULL || thread->threadObj() == NULL, "sanity check");
203 _jthread = to_jobject(thread->vthread());
204 };
205 jthread jni_thread() { return (jthread)_jthread; }
206 };
207
208 class JvmtiClassEventMark : public JvmtiVirtualThreadEventMark {
209 private:
210 jclass _jc;
211
212 public:
213 JvmtiClassEventMark(JavaThread *thread, Klass* klass) :
214 JvmtiVirtualThreadEventMark(thread) {
215 _jc = to_jclass(klass);
216 };
217 jclass jni_class() { return _jc; }
218 };
219
220 class JvmtiMethodEventMark : public JvmtiVirtualThreadEventMark {
221 private:
222 jmethodID _mid;
223
224 public:
225 JvmtiMethodEventMark(JavaThread *thread, const methodHandle& method) :
226 JvmtiVirtualThreadEventMark(thread),
227 _mid(to_jmethodID(method)) {};
228 jmethodID jni_methodID() { return _mid; }
229 };
230
231 class JvmtiLocationEventMark : public JvmtiMethodEventMark {
232 private:
233 jlocation _loc;
234
235 public:
236 JvmtiLocationEventMark(JavaThread *thread, const methodHandle& method, address location) :
237 JvmtiMethodEventMark(thread, method),
238 _loc(location - method->code_base()) {};
239 jlocation location() { return _loc; }
240 };
241
242 class JvmtiExceptionEventMark : public JvmtiLocationEventMark {
243 private:
244 jobject _exc;
245
246 public:
247 JvmtiExceptionEventMark(JavaThread *thread, const methodHandle& method, address location, Handle exception) :
248 JvmtiLocationEventMark(thread, method, location),
249 _exc(to_jobject(exception())) {};
250 jobject exception() { return _exc; }
251 };
252
253 class JvmtiClassFileLoadEventMark : public JvmtiThreadEventMark {
254 private:
255 const char *_class_name;
256 jobject _jloader;
257 jobject _protection_domain;
258 jclass _class_being_redefined;
259
260 public:
261 JvmtiClassFileLoadEventMark(JavaThread *thread, Symbol* name,
262 Handle class_loader, Handle prot_domain, Klass* class_being_redefined) : JvmtiThreadEventMark(thread) {
263 _class_name = name != NULL? name->as_utf8() : NULL;
264 _jloader = (jobject)to_jobject(class_loader());
265 _protection_domain = (jobject)to_jobject(prot_domain());
266 if (class_being_redefined == NULL) {
267 _class_being_redefined = NULL;
268 } else {
269 _class_being_redefined = (jclass)to_jclass(class_being_redefined);
270 }
271 };
272 const char *class_name() {
273 return _class_name;
274 }
275 jobject jloader() {
276 return _jloader;
277 }
278 jobject protection_domain() {
279 return _protection_domain;
280 }
281 jclass class_being_redefined() {
282 return _class_being_redefined;
283 }
284 };
285
286 //////////////////////////////////////////////////////////////////////////////
287
288 int JvmtiExport::_field_access_count = 0;
289 int JvmtiExport::_field_modification_count = 0;
290
291 bool JvmtiExport::_can_access_local_variables = false;
292 bool JvmtiExport::_can_hotswap_or_post_breakpoint = false;
293 bool JvmtiExport::_can_modify_any_class = false;
294 bool JvmtiExport::_can_walk_any_space = false;
295
296 uint64_t JvmtiExport::_redefinition_count = 0;
297 bool JvmtiExport::_all_dependencies_are_recorded = false;
298
299 //
300 // field access management
301 //
302
303 // interpreter generator needs the address of the counter
304 address JvmtiExport::get_field_access_count_addr() {
305 // We don't grab a lock because we don't want to
306 // serialize field access between all threads. This means that a
307 // thread on another processor can see the wrong count value and
308 // may either miss making a needed call into post_field_access()
309 // or will make an unneeded call into post_field_access(). We pay
310 // this price to avoid slowing down the VM when we aren't watching
311 // field accesses.
312 // Other access/mutation safe by virtue of being in VM state.
313 return (address)(&_field_access_count);
314 }
315
316 //
317 // field modification management
318 //
319
320 // interpreter generator needs the address of the counter
321 address JvmtiExport::get_field_modification_count_addr() {
322 // We don't grab a lock because we don't
323 // want to serialize field modification between all threads. This
324 // means that a thread on another processor can see the wrong
325 // count value and may either miss making a needed call into
326 // post_field_modification() or will make an unneeded call into
327 // post_field_modification(). We pay this price to avoid slowing
328 // down the VM when we aren't watching field modifications.
329 // Other access/mutation safe by virtue of being in VM state.
330 return (address)(&_field_modification_count);
331 }
332
333
334 ///////////////////////////////////////////////////////////////
335 // Functions needed by java.lang.instrument for starting up javaagent.
336 ///////////////////////////////////////////////////////////////
337
338 jint
339 JvmtiExport::get_jvmti_interface(JavaVM *jvm, void **penv, jint version) {
340 // The JVMTI_VERSION_INTERFACE_JVMTI part of the version number
341 // has already been validated in JNI GetEnv().
342 int major, minor, micro;
343
344 // micro version doesn't matter here (yet?)
345 decode_version_values(version, &major, &minor, µ);
346 switch (major) {
347 case 1:
348 switch (minor) {
349 case 0: // version 1.0.<micro> is recognized
350 case 1: // version 1.1.<micro> is recognized
351 case 2: // version 1.2.<micro> is recognized
352 break;
353
354 default:
355 return JNI_EVERSION; // unsupported minor version number
356 }
357 break;
358 case 9:
359 switch (minor) {
360 case 0: // version 9.0.<micro> is recognized
361 break;
362 default:
363 return JNI_EVERSION; // unsupported minor version number
364 }
365 break;
366 case 11:
367 switch (minor) {
368 case 0: // version 11.0.<micro> is recognized
369 break;
370 default:
371 return JNI_EVERSION; // unsupported minor version number
372 }
373 break;
374 default:
375 // Starting from 13 we do not care about minor version anymore
376 if (major < 13 || major > VM_Version::vm_major_version()) {
377 return JNI_EVERSION; // unsupported major version number
378 }
379 }
380 if (Continuations::enabled()) {
381 // Virtual threads support. There is a performance impact when VTMS transitions are enabled.
382 java_lang_VirtualThread::set_notify_jvmti_events(true);
383 if (JvmtiEnv::get_phase() == JVMTI_PHASE_LIVE) {
384 ThreadInVMfromNative __tiv(JavaThread::current());
385 java_lang_VirtualThread::init_static_notify_jvmti_events();
386 }
387 }
388
389 if (JvmtiEnv::get_phase() == JVMTI_PHASE_LIVE) {
390 JavaThread* current_thread = JavaThread::current();
391 // transition code: native to VM
392 ThreadInVMfromNative __tiv(current_thread);
393 VM_ENTRY_BASE(jvmtiEnv*, JvmtiExport::get_jvmti_interface, current_thread)
394 debug_only(VMNativeEntryWrapper __vew;)
395
396 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version);
397 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv*
398 return JNI_OK;
399
400 } else if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
401 // not live, no thread to transition
402 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version);
403 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv*
404 return JNI_OK;
405
406 } else {
407 // Called at the wrong time
408 *penv = NULL;
409 return JNI_EDETACHED;
410 }
411 }
412
413 void
414 JvmtiExport::add_default_read_edges(Handle h_module, TRAPS) {
415 if (!Universe::is_module_initialized()) {
416 return; // extra safety
417 }
418 assert(!h_module.is_null(), "module should always be set");
419
420 // Invoke the transformedByAgent method
421 JavaValue result(T_VOID);
422 JavaCalls::call_static(&result,
423 vmClasses::module_Modules_klass(),
424 vmSymbols::transformedByAgent_name(),
425 vmSymbols::transformedByAgent_signature(),
426 h_module,
427 THREAD);
428
429 if (HAS_PENDING_EXCEPTION) {
430 LogTarget(Trace, jvmti) log;
431 LogStream log_stream(log);
432 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
433 log_stream.cr();
434 CLEAR_PENDING_EXCEPTION;
435 return;
436 }
437 }
438
439 jvmtiError
440 JvmtiExport::add_module_reads(Handle module, Handle to_module, TRAPS) {
441 if (!Universe::is_module_initialized()) {
442 return JVMTI_ERROR_NONE; // extra safety
443 }
444 assert(!module.is_null(), "module should always be set");
445 assert(!to_module.is_null(), "to_module should always be set");
446
447 // Invoke the addReads method
448 JavaValue result(T_VOID);
449 JavaCalls::call_static(&result,
450 vmClasses::module_Modules_klass(),
451 vmSymbols::addReads_name(),
452 vmSymbols::addReads_signature(),
453 module,
454 to_module,
455 THREAD);
456
457 if (HAS_PENDING_EXCEPTION) {
458 LogTarget(Trace, jvmti) log;
459 LogStream log_stream(log);
460 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
461 log_stream.cr();
462 CLEAR_PENDING_EXCEPTION;
463 return JVMTI_ERROR_INTERNAL;
464 }
465 return JVMTI_ERROR_NONE;
466 }
467
468 jvmtiError
469 JvmtiExport::add_module_exports(Handle module, Handle pkg_name, Handle to_module, TRAPS) {
470 if (!Universe::is_module_initialized()) {
471 return JVMTI_ERROR_NONE; // extra safety
472 }
473 assert(!module.is_null(), "module should always be set");
474 assert(!to_module.is_null(), "to_module should always be set");
475 assert(!pkg_name.is_null(), "pkg_name should always be set");
476
477 // Invoke the addExports method
478 JavaValue result(T_VOID);
479 JavaCalls::call_static(&result,
480 vmClasses::module_Modules_klass(),
481 vmSymbols::addExports_name(),
482 vmSymbols::addExports_signature(),
483 module,
484 pkg_name,
485 to_module,
486 THREAD);
487
488 if (HAS_PENDING_EXCEPTION) {
489 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
490 LogTarget(Trace, jvmti) log;
491 LogStream log_stream(log);
492 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
493 log_stream.cr();
494 CLEAR_PENDING_EXCEPTION;
495 if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) {
496 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
497 }
498 return JVMTI_ERROR_INTERNAL;
499 }
500 return JVMTI_ERROR_NONE;
501 }
502
503 jvmtiError
504 JvmtiExport::add_module_opens(Handle module, Handle pkg_name, Handle to_module, TRAPS) {
505 if (!Universe::is_module_initialized()) {
506 return JVMTI_ERROR_NONE; // extra safety
507 }
508 assert(!module.is_null(), "module should always be set");
509 assert(!to_module.is_null(), "to_module should always be set");
510 assert(!pkg_name.is_null(), "pkg_name should always be set");
511
512 // Invoke the addOpens method
513 JavaValue result(T_VOID);
514 JavaCalls::call_static(&result,
515 vmClasses::module_Modules_klass(),
516 vmSymbols::addOpens_name(),
517 vmSymbols::addExports_signature(),
518 module,
519 pkg_name,
520 to_module,
521 THREAD);
522
523 if (HAS_PENDING_EXCEPTION) {
524 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
525 LogTarget(Trace, jvmti) log;
526 LogStream log_stream(log);
527 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
528 log_stream.cr();
529 CLEAR_PENDING_EXCEPTION;
530 if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) {
531 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
532 }
533 return JVMTI_ERROR_INTERNAL;
534 }
535 return JVMTI_ERROR_NONE;
536 }
537
538 jvmtiError
539 JvmtiExport::add_module_uses(Handle module, Handle service, TRAPS) {
540 if (!Universe::is_module_initialized()) {
541 return JVMTI_ERROR_NONE; // extra safety
542 }
543 assert(!module.is_null(), "module should always be set");
544 assert(!service.is_null(), "service should always be set");
545
546 // Invoke the addUses method
547 JavaValue result(T_VOID);
548 JavaCalls::call_static(&result,
549 vmClasses::module_Modules_klass(),
550 vmSymbols::addUses_name(),
551 vmSymbols::addUses_signature(),
552 module,
553 service,
554 THREAD);
555
556 if (HAS_PENDING_EXCEPTION) {
557 LogTarget(Trace, jvmti) log;
558 LogStream log_stream(log);
559 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
560 log_stream.cr();
561 CLEAR_PENDING_EXCEPTION;
562 return JVMTI_ERROR_INTERNAL;
563 }
564 return JVMTI_ERROR_NONE;
565 }
566
567 jvmtiError
568 JvmtiExport::add_module_provides(Handle module, Handle service, Handle impl_class, TRAPS) {
569 if (!Universe::is_module_initialized()) {
570 return JVMTI_ERROR_NONE; // extra safety
571 }
572 assert(!module.is_null(), "module should always be set");
573 assert(!service.is_null(), "service should always be set");
574 assert(!impl_class.is_null(), "impl_class should always be set");
575
576 // Invoke the addProvides method
577 JavaValue result(T_VOID);
578 JavaCalls::call_static(&result,
579 vmClasses::module_Modules_klass(),
580 vmSymbols::addProvides_name(),
581 vmSymbols::addProvides_signature(),
582 module,
583 service,
584 impl_class,
585 THREAD);
586
587 if (HAS_PENDING_EXCEPTION) {
588 LogTarget(Trace, jvmti) log;
589 LogStream log_stream(log);
590 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
591 log_stream.cr();
592 CLEAR_PENDING_EXCEPTION;
593 return JVMTI_ERROR_INTERNAL;
594 }
595 return JVMTI_ERROR_NONE;
596 }
597
598 void
599 JvmtiExport::decode_version_values(jint version, int * major, int * minor,
600 int * micro) {
601 *major = (version & JVMTI_VERSION_MASK_MAJOR) >> JVMTI_VERSION_SHIFT_MAJOR;
602 *minor = (version & JVMTI_VERSION_MASK_MINOR) >> JVMTI_VERSION_SHIFT_MINOR;
603 *micro = (version & JVMTI_VERSION_MASK_MICRO) >> JVMTI_VERSION_SHIFT_MICRO;
604 }
605
606 void JvmtiExport::enter_primordial_phase() {
607 JvmtiEnvBase::set_phase(JVMTI_PHASE_PRIMORDIAL);
608 }
609
610 void JvmtiExport::enter_early_start_phase() {
611 set_early_vmstart_recorded(true);
612 }
613
614 void JvmtiExport::enter_start_phase() {
615 JvmtiEnvBase::set_phase(JVMTI_PHASE_START);
616 }
617
618 void JvmtiExport::enter_onload_phase() {
619 JvmtiEnvBase::set_phase(JVMTI_PHASE_ONLOAD);
620 }
621
622 void JvmtiExport::enter_live_phase() {
623 JvmtiEnvBase::set_phase(JVMTI_PHASE_LIVE);
624 }
625
626 //
627 // JVMTI events that the VM posts to the debugger and also startup agent
628 // and call the agent's premain() for java.lang.instrument.
629 //
630
631 void JvmtiExport::post_early_vm_start() {
632 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg Early VM start event triggered" ));
633
634 // can now enable some events
635 JvmtiEventController::vm_start();
636
637 JvmtiEnvIterator it;
638 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
639 // Only early vmstart envs post early VMStart event
640 if (env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) {
641 EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt Early VM start event sent" ));
642 JavaThread *thread = JavaThread::current();
643 JvmtiThreadEventMark jem(thread);
644 JvmtiJavaThreadEventTransition jet(thread);
645 jvmtiEventVMStart callback = env->callbacks()->VMStart;
646 if (callback != NULL) {
647 (*callback)(env->jvmti_external(), jem.jni_env());
648 }
649 }
650 }
651 }
652
653 void JvmtiExport::post_vm_start() {
654 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg VM start event triggered" ));
655
656 // can now enable some events
657 JvmtiEventController::vm_start();
658
659 JvmtiEnvIterator it;
660 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
661 // Early vmstart envs do not post normal VMStart event
662 if (!env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) {
663 EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt VM start event sent" ));
664
665 JavaThread *thread = JavaThread::current();
666 JvmtiThreadEventMark jem(thread);
667 JvmtiJavaThreadEventTransition jet(thread);
668 jvmtiEventVMStart callback = env->callbacks()->VMStart;
669 if (callback != NULL) {
670 (*callback)(env->jvmti_external(), jem.jni_env());
671 }
672 }
673 }
674 }
675
676 static OopStorage* _jvmti_oop_storage = NULL;
677 static OopStorage* _weak_tag_storage = NULL;
678
679 OopStorage* JvmtiExport::jvmti_oop_storage() {
680 assert(_jvmti_oop_storage != NULL, "not yet initialized");
681 return _jvmti_oop_storage;
682 }
683
684 OopStorage* JvmtiExport::weak_tag_storage() {
685 assert(_weak_tag_storage != NULL, "not yet initialized");
686 return _weak_tag_storage;
687 }
688
689 void JvmtiExport::initialize_oop_storage() {
690 // OopStorage needs to be created early in startup and unconditionally
691 // because of OopStorageSet static array indices.
692 _jvmti_oop_storage = OopStorageSet::create_strong("JVMTI OopStorage", mtServiceability);
693 _weak_tag_storage = OopStorageSet::create_weak("JVMTI Tag Weak OopStorage", mtServiceability);
694 _weak_tag_storage->register_num_dead_callback(&JvmtiTagMap::gc_notification);
695 }
696
697 void JvmtiExport::post_vm_initialized() {
698 EVT_TRIG_TRACE(JVMTI_EVENT_VM_INIT, ("Trg VM init event triggered" ));
699
700 // can now enable events
701 JvmtiEventController::vm_init();
702
703 JvmtiEnvIterator it;
704 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
705 if (env->is_enabled(JVMTI_EVENT_VM_INIT)) {
706 EVT_TRACE(JVMTI_EVENT_VM_INIT, ("Evt VM init event sent" ));
707
708 JavaThread *thread = JavaThread::current();
709 JvmtiThreadEventMark jem(thread);
710 JvmtiJavaThreadEventTransition jet(thread);
711 jvmtiEventVMInit callback = env->callbacks()->VMInit;
712 if (callback != NULL) {
713 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
714 }
715 }
716 }
717 }
718
719
720 void JvmtiExport::post_vm_death() {
721 EVT_TRIG_TRACE(JVMTI_EVENT_VM_DEATH, ("Trg VM death event triggered" ));
722
723 JvmtiTagMap::flush_all_object_free_events();
724
725 JvmtiEnvIterator it;
726 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
727 if (env->is_enabled(JVMTI_EVENT_VM_DEATH)) {
728 EVT_TRACE(JVMTI_EVENT_VM_DEATH, ("Evt VM death event sent" ));
729
730 JavaThread *thread = JavaThread::current();
731 JvmtiEventMark jem(thread);
732 JvmtiJavaThreadEventTransition jet(thread);
733 jvmtiEventVMDeath callback = env->callbacks()->VMDeath;
734 if (callback != NULL) {
735 (*callback)(env->jvmti_external(), jem.jni_env());
736 }
737 }
738 }
739
740 JvmtiEnvBase::set_phase(JVMTI_PHASE_DEAD);
741 JvmtiEventController::vm_death();
742 }
743
744 char**
745 JvmtiExport::get_all_native_method_prefixes(int* count_ptr) {
746 // Have to grab JVMTI thread state lock to be sure environment doesn't
747 // go away while we iterate them. No locks during VM bring-up.
748 if (Threads::number_of_threads() == 0 || SafepointSynchronize::is_at_safepoint()) {
749 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
750 } else {
751 MutexLocker mu(JvmtiThreadState_lock);
752 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
753 }
754 }
755
756 // Convert an external thread reference to a JavaThread found on the
757 // specified ThreadsList. The ThreadsListHandle in the caller "protects"
758 // the returned JavaThread *.
759 //
760 // If thread_oop_p is not NULL, then the caller wants to use the oop
761 // after this call so the oop is returned. On success, *jt_pp is set
762 // to the converted JavaThread * and JVMTI_ERROR_NONE is returned.
763 // On error, returns various JVMTI_ERROR_* values.
764 //
765 jvmtiError
766 JvmtiExport::cv_external_thread_to_JavaThread(ThreadsList * t_list,
767 jthread thread,
768 JavaThread ** jt_pp,
769 oop * thread_oop_p) {
770 assert(t_list != NULL, "must have a ThreadsList");
771 assert(jt_pp != NULL, "must have a return JavaThread pointer");
772 // thread_oop_p is optional so no assert()
773
774 if (thread_oop_p != NULL) {
775 *thread_oop_p = NULL;
776 }
777
778 oop thread_oop = JNIHandles::resolve_external_guard(thread);
779 if (thread_oop == NULL) {
780 // NULL jthread, GC'ed jthread or a bad JNI handle.
781 return JVMTI_ERROR_INVALID_THREAD;
782 }
783 // Looks like an oop at this point.
784
785 if (!thread_oop->is_a(vmClasses::Thread_klass())) {
786 // The oop is not a java.lang.Thread.
787 return JVMTI_ERROR_INVALID_THREAD;
788 }
789 // Looks like a java.lang.Thread oop at this point.
790
791 if (thread_oop_p != NULL) {
792 // Return the oop to the caller; the caller may still want
793 // the oop even if this function returns an error.
794 *thread_oop_p = thread_oop;
795 }
796
797 JavaThread * java_thread = java_lang_Thread::thread(thread_oop);
798 if (java_thread == NULL) {
799 if (java_lang_VirtualThread::is_instance(thread_oop)) {
800 return JVMTI_ERROR_INVALID_THREAD;
801 }
802 // The java.lang.Thread does not contain a JavaThread * so it has
803 // not yet run or it has died.
804 return JVMTI_ERROR_THREAD_NOT_ALIVE;
805 }
806 // Looks like a live JavaThread at this point.
807
808 // We do not check the EnableThreadSMRExtraValidityChecks option
809 // for this includes() call because JVM/TI's spec is tighter.
810 if (!t_list->includes(java_thread)) {
811 // Not on the JavaThreads list so it is not alive.
812 return JVMTI_ERROR_THREAD_NOT_ALIVE;
813 }
814
815 // Return a live JavaThread that is "protected" by the
816 // ThreadsListHandle in the caller.
817 *jt_pp = java_thread;
818
819 return JVMTI_ERROR_NONE;
820 }
821
822 // Convert an oop to a JavaThread found on the specified ThreadsList.
823 // The ThreadsListHandle in the caller "protects" the returned
824 // JavaThread *.
825 //
826 // On success, *jt_pp is set to the converted JavaThread * and
827 // JVMTI_ERROR_NONE is returned. On error, returns various
828 // JVMTI_ERROR_* values.
829 //
830 jvmtiError
831 JvmtiExport::cv_oop_to_JavaThread(ThreadsList * t_list, oop thread_oop,
832 JavaThread ** jt_pp) {
833 assert(t_list != NULL, "must have a ThreadsList");
834 assert(thread_oop != NULL, "must have an oop");
835 assert(jt_pp != NULL, "must have a return JavaThread pointer");
836
837 if (!thread_oop->is_a(vmClasses::Thread_klass())) {
838 // The oop is not a java.lang.Thread.
839 return JVMTI_ERROR_INVALID_THREAD;
840 }
841 // Looks like a java.lang.Thread oop at this point.
842
843 JavaThread * java_thread = java_lang_Thread::thread(thread_oop);
844 if (java_thread == NULL) {
845 // The java.lang.Thread does not contain a JavaThread * so it has
846 // not yet run or it has died.
847 return JVMTI_ERROR_THREAD_NOT_ALIVE;
848 }
849 // Looks like a live JavaThread at this point.
850
851 // We do not check the EnableThreadSMRExtraValidityChecks option
852 // for this includes() call because JVM/TI's spec is tighter.
853 if (!t_list->includes(java_thread)) {
854 // Not on the JavaThreads list so it is not alive.
855 return JVMTI_ERROR_THREAD_NOT_ALIVE;
856 }
857
858 // Return a live JavaThread that is "protected" by the
859 // ThreadsListHandle in the caller.
860 *jt_pp = java_thread;
861
862 return JVMTI_ERROR_NONE;
863 }
864
865 class JvmtiClassFileLoadHookPoster : public StackObj {
866 private:
867 Symbol* _h_name;
868 Handle _class_loader;
869 Handle _h_protection_domain;
870 unsigned char ** _data_ptr;
871 unsigned char ** _end_ptr;
872 JavaThread * _thread;
873 jint _curr_len;
874 unsigned char * _curr_data;
875 JvmtiEnv * _curr_env;
876 JvmtiCachedClassFileData ** _cached_class_file_ptr;
877 JvmtiThreadState * _state;
878 Klass* _class_being_redefined;
879 JvmtiClassLoadKind _load_kind;
880 bool _has_been_modified;
881
882 public:
883 inline JvmtiClassFileLoadHookPoster(Symbol* h_name, Handle class_loader,
884 Handle h_protection_domain,
885 unsigned char **data_ptr, unsigned char **end_ptr,
886 JvmtiCachedClassFileData **cache_ptr) {
887 _h_name = h_name;
888 _class_loader = class_loader;
889 _h_protection_domain = h_protection_domain;
890 _data_ptr = data_ptr;
891 _end_ptr = end_ptr;
892 _thread = JavaThread::current();
893 _curr_len = *end_ptr - *data_ptr;
894 _curr_data = *data_ptr;
895 _curr_env = NULL;
896 _cached_class_file_ptr = cache_ptr;
897 _has_been_modified = false;
898
899 assert(!_thread->is_in_any_VTMS_transition(), "CFLH events are not allowed in any VTMS transition");
900 _state = _thread->jvmti_thread_state();
901 if (_state != NULL) {
902 _class_being_redefined = _state->get_class_being_redefined();
903 _load_kind = _state->get_class_load_kind();
904 Klass* klass = (_class_being_redefined == NULL) ? NULL : _class_being_redefined;
905 if (_load_kind != jvmti_class_load_kind_load && klass != NULL) {
906 ModuleEntry* module_entry = InstanceKlass::cast(klass)->module();
907 assert(module_entry != NULL, "module_entry should always be set");
908 if (module_entry->is_named() &&
909 module_entry->module() != NULL &&
910 !module_entry->has_default_read_edges()) {
911 if (!module_entry->set_has_default_read_edges()) {
912 // We won a potential race.
913 // Add read edges to the unnamed modules of the bootstrap and app class loaders
914 Handle class_module(_thread, module_entry->module()); // Obtain j.l.r.Module
915 JvmtiExport::add_default_read_edges(class_module, _thread);
916 }
917 }
918 }
919 // Clear class_being_redefined flag here. The action
920 // from agent handler could generate a new class file load
921 // hook event and if it is not cleared the new event generated
922 // from regular class file load could have this stale redefined
923 // class handle info.
924 _state->clear_class_being_redefined();
925 } else {
926 // redefine and retransform will always set the thread state
927 _class_being_redefined = NULL;
928 _load_kind = jvmti_class_load_kind_load;
929 }
930 }
931
932 void post() {
933 post_all_envs();
934 copy_modified_data();
935 }
936
937 bool has_been_modified() { return _has_been_modified; }
938
939 private:
940 void post_all_envs() {
941 if (_load_kind != jvmti_class_load_kind_retransform) {
942 // for class load and redefine,
943 // call the non-retransformable agents
944 JvmtiEnvIterator it;
945 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
946 if (!env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
947 // non-retransformable agents cannot retransform back,
948 // so no need to cache the original class file bytes
949 post_to_env(env, false);
950 }
951 }
952 }
953 JvmtiEnvIterator it;
954 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
955 // retransformable agents get all events
956 if (env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
957 // retransformable agents need to cache the original class file
958 // bytes if changes are made via the ClassFileLoadHook
959 post_to_env(env, true);
960 }
961 }
962 }
963
964 void post_to_env(JvmtiEnv* env, bool caching_needed) {
965 if (env->phase() == JVMTI_PHASE_PRIMORDIAL && !env->early_class_hook_env()) {
966 return;
967 }
968 unsigned char *new_data = NULL;
969 jint new_len = 0;
970 JvmtiClassFileLoadEventMark jem(_thread, _h_name, _class_loader,
971 _h_protection_domain,
972 _class_being_redefined);
973 JvmtiJavaThreadEventTransition jet(_thread);
974 jvmtiEventClassFileLoadHook callback = env->callbacks()->ClassFileLoadHook;
975 if (callback != NULL) {
976 (*callback)(env->jvmti_external(), jem.jni_env(),
977 jem.class_being_redefined(),
978 jem.jloader(), jem.class_name(),
979 jem.protection_domain(),
980 _curr_len, _curr_data,
981 &new_len, &new_data);
982 }
983 if (new_data != NULL) {
984 // this agent has modified class data.
985 _has_been_modified = true;
986 if (caching_needed && *_cached_class_file_ptr == NULL) {
987 // data has been changed by the new retransformable agent
988 // and it hasn't already been cached, cache it
989 JvmtiCachedClassFileData *p;
990 p = (JvmtiCachedClassFileData *)os::malloc(
991 offset_of(JvmtiCachedClassFileData, data) + _curr_len, mtInternal);
992 if (p == NULL) {
993 vm_exit_out_of_memory(offset_of(JvmtiCachedClassFileData, data) + _curr_len,
994 OOM_MALLOC_ERROR,
995 "unable to allocate cached copy of original class bytes");
996 }
997 p->length = _curr_len;
998 memcpy(p->data, _curr_data, _curr_len);
999 *_cached_class_file_ptr = p;
1000 }
1001
1002 if (_curr_data != *_data_ptr) {
1003 // curr_data is previous agent modified class data.
1004 // And this has been changed by the new agent so
1005 // we can delete it now.
1006 _curr_env->Deallocate(_curr_data);
1007 }
1008
1009 // Class file data has changed by the current agent.
1010 _curr_data = new_data;
1011 _curr_len = new_len;
1012 // Save the current agent env we need this to deallocate the
1013 // memory allocated by this agent.
1014 _curr_env = env;
1015 }
1016 }
1017
1018 void copy_modified_data() {
1019 // if one of the agent has modified class file data.
1020 // Copy modified class data to new resources array.
1021 if (_curr_data != *_data_ptr) {
1022 *_data_ptr = NEW_RESOURCE_ARRAY(u1, _curr_len);
1023 memcpy(*_data_ptr, _curr_data, _curr_len);
1024 *_end_ptr = *_data_ptr + _curr_len;
1025 _curr_env->Deallocate(_curr_data);
1026 }
1027 }
1028 };
1029
1030 bool JvmtiExport::is_early_phase() {
1031 return JvmtiEnvBase::get_phase() <= JVMTI_PHASE_PRIMORDIAL;
1032 }
1033
1034 bool JvmtiExport::has_early_class_hook_env() {
1035 JvmtiEnvIterator it;
1036 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1037 if (env->early_class_hook_env()) {
1038 return true;
1039 }
1040 }
1041 return false;
1042 }
1043
1044 bool JvmtiExport::_should_post_class_file_load_hook = false;
1045
1046 // this entry is for class file load hook on class load, redefine and retransform
1047 bool JvmtiExport::post_class_file_load_hook(Symbol* h_name,
1048 Handle class_loader,
1049 Handle h_protection_domain,
1050 unsigned char **data_ptr,
1051 unsigned char **end_ptr,
1052 JvmtiCachedClassFileData **cache_ptr) {
1053 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1054 return false;
1055 }
1056 if (JavaThread::current()->is_in_tmp_VTMS_transition()) {
1057 return false; // skip CFLH events in tmp VTMS transition
1058 }
1059
1060 JvmtiClassFileLoadHookPoster poster(h_name, class_loader,
1061 h_protection_domain,
1062 data_ptr, end_ptr,
1063 cache_ptr);
1064 poster.post();
1065 return poster.has_been_modified();
1066 }
1067
1068 void JvmtiExport::report_unsupported(bool on) {
1069 // If any JVMTI service is turned on, we need to exit before native code
1070 // tries to access nonexistent services.
1071 if (on) {
1072 vm_exit_during_initialization("Java Kernel does not support JVMTI.");
1073 }
1074 }
1075
1076
1077 static inline Klass* oop_to_klass(oop obj) {
1078 Klass* k = obj->klass();
1079
1080 // if the object is a java.lang.Class then return the java mirror
1081 if (k == vmClasses::Class_klass()) {
1082 if (!java_lang_Class::is_primitive(obj)) {
1083 k = java_lang_Class::as_Klass(obj);
1084 assert(k != NULL, "class for non-primitive mirror must exist");
1085 }
1086 }
1087 return k;
1088 }
1089
1090 class JvmtiObjectAllocEventMark : public JvmtiClassEventMark {
1091 private:
1092 jobject _jobj;
1093 jlong _size;
1094 public:
1095 JvmtiObjectAllocEventMark(JavaThread *thread, oop obj) : JvmtiClassEventMark(thread, oop_to_klass(obj)) {
1096 _jobj = (jobject)to_jobject(obj);
1097 _size = obj->size() * wordSize;
1098 };
1099 jobject jni_jobject() { return _jobj; }
1100 jlong size() { return _size; }
1101 };
1102
1103 class JvmtiCompiledMethodLoadEventMark : public JvmtiMethodEventMark {
1104 private:
1105 jint _code_size;
1106 const void *_code_data;
1107 jint _map_length;
1108 jvmtiAddrLocationMap *_map;
1109 const void *_compile_info;
1110 public:
1111 JvmtiCompiledMethodLoadEventMark(JavaThread *thread, nmethod *nm, void* compile_info_ptr = NULL)
1112 : JvmtiMethodEventMark(thread,methodHandle(thread, nm->method())) {
1113 _code_data = nm->code_begin();
1114 _code_size = nm->code_size();
1115 _compile_info = compile_info_ptr; // Set void pointer of compiledMethodLoad Event. Default value is NULL.
1116 JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nm, &_map, &_map_length);
1117 }
1118 ~JvmtiCompiledMethodLoadEventMark() {
1119 FREE_C_HEAP_ARRAY(jvmtiAddrLocationMap, _map);
1120 }
1121
1122 jint code_size() { return _code_size; }
1123 const void *code_data() { return _code_data; }
1124 jint map_length() { return _map_length; }
1125 const jvmtiAddrLocationMap* map() { return _map; }
1126 const void *compile_info() { return _compile_info; }
1127 };
1128
1129
1130
1131 class JvmtiMonitorEventMark : public JvmtiVirtualThreadEventMark {
1132 private:
1133 jobject _jobj;
1134 public:
1135 JvmtiMonitorEventMark(JavaThread *thread, oop object)
1136 : JvmtiVirtualThreadEventMark(thread){
1137 _jobj = to_jobject(object);
1138 }
1139 jobject jni_object() { return _jobj; }
1140 };
1141
1142 ///////////////////////////////////////////////////////////////
1143 //
1144 // pending CompiledMethodUnload support
1145 //
1146
1147 void JvmtiExport::post_compiled_method_unload(
1148 jmethodID method, const void *code_begin) {
1149 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1150 return;
1151 }
1152 JavaThread* thread = JavaThread::current();
1153 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
1154 ("[%s] method compile unload event triggered",
1155 JvmtiTrace::safe_get_thread_name(thread)));
1156
1157 // post the event for each environment that has this event enabled.
1158 JvmtiEnvIterator it;
1159 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1160 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_UNLOAD)) {
1161 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1162 continue;
1163 }
1164 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
1165 ("[%s] class compile method unload event sent jmethodID " PTR_FORMAT,
1166 JvmtiTrace::safe_get_thread_name(thread), p2i(method)));
1167
1168 ResourceMark rm(thread);
1169
1170 JvmtiEventMark jem(thread);
1171 JvmtiJavaThreadEventTransition jet(thread);
1172 jvmtiEventCompiledMethodUnload callback = env->callbacks()->CompiledMethodUnload;
1173 if (callback != NULL) {
1174 (*callback)(env->jvmti_external(), method, code_begin);
1175 }
1176 }
1177 }
1178 }
1179
1180 ///////////////////////////////////////////////////////////////
1181 //
1182 // JvmtiExport
1183 //
1184
1185 void JvmtiExport::post_raw_breakpoint(JavaThread *thread, Method* method, address location) {
1186 HandleMark hm(thread);
1187 methodHandle mh(thread, method);
1188
1189 JvmtiThreadState *state = thread->jvmti_thread_state();
1190 if (state == NULL) {
1191 return;
1192 }
1193 if (thread->is_in_any_VTMS_transition()) {
1194 return; // no events should be posted if thread is in any VTMS transition
1195 }
1196
1197 EVT_TRIG_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Trg Breakpoint triggered",
1198 JvmtiTrace::safe_get_thread_name(thread)));
1199 JvmtiEnvThreadStateIterator it(state);
1200 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1201 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_BREAKPOINT);
1202 if (!ets->breakpoint_posted() && ets->is_enabled(JVMTI_EVENT_BREAKPOINT)) {
1203 ThreadState old_os_state = thread->osthread()->get_state();
1204 thread->osthread()->set_state(BREAKPOINTED);
1205 EVT_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Evt Breakpoint sent %s.%s @ " INTX_FORMAT,
1206 JvmtiTrace::safe_get_thread_name(thread),
1207 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1208 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1209 location - mh()->code_base() ));
1210
1211 JvmtiEnv *env = ets->get_env();
1212 JvmtiLocationEventMark jem(thread, mh, location);
1213 JvmtiJavaThreadEventTransition jet(thread);
1214 jvmtiEventBreakpoint callback = env->callbacks()->Breakpoint;
1215 if (callback != NULL) {
1216 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1217 jem.jni_methodID(), jem.location());
1218 }
1219
1220 ets->set_breakpoint_posted();
1221 thread->osthread()->set_state(old_os_state);
1222 }
1223 }
1224 }
1225
1226 //////////////////////////////////////////////////////////////////////////////
1227
1228 bool JvmtiExport::_can_get_source_debug_extension = false;
1229 bool JvmtiExport::_can_maintain_original_method_order = false;
1230 bool JvmtiExport::_can_post_interpreter_events = false;
1231 bool JvmtiExport::_can_post_on_exceptions = false;
1232 bool JvmtiExport::_can_post_breakpoint = false;
1233 bool JvmtiExport::_can_post_field_access = false;
1234 bool JvmtiExport::_can_post_field_modification = false;
1235 bool JvmtiExport::_can_post_method_entry = false;
1236 bool JvmtiExport::_can_post_method_exit = false;
1237 bool JvmtiExport::_can_post_frame_pop = false;
1238 bool JvmtiExport::_can_pop_frame = false;
1239 bool JvmtiExport::_can_force_early_return = false;
1240 bool JvmtiExport::_can_support_virtual_threads = false;
1241 bool JvmtiExport::_can_get_owned_monitor_info = false;
1242
1243 bool JvmtiExport::_early_vmstart_recorded = false;
1244
1245 bool JvmtiExport::_should_post_single_step = false;
1246 bool JvmtiExport::_should_post_field_access = false;
1247 bool JvmtiExport::_should_post_field_modification = false;
1248 bool JvmtiExport::_should_post_class_load = false;
1249 bool JvmtiExport::_should_post_class_prepare = false;
1250 bool JvmtiExport::_should_post_class_unload = false;
1251 bool JvmtiExport::_should_post_thread_life = false;
1252 bool JvmtiExport::_should_clean_up_heap_objects = false;
1253 bool JvmtiExport::_should_post_native_method_bind = false;
1254 bool JvmtiExport::_should_post_dynamic_code_generated = false;
1255 bool JvmtiExport::_should_post_data_dump = false;
1256 bool JvmtiExport::_should_post_compiled_method_load = false;
1257 bool JvmtiExport::_should_post_compiled_method_unload = false;
1258 bool JvmtiExport::_should_post_monitor_contended_enter = false;
1259 bool JvmtiExport::_should_post_monitor_contended_entered = false;
1260 bool JvmtiExport::_should_post_monitor_wait = false;
1261 bool JvmtiExport::_should_post_monitor_waited = false;
1262 bool JvmtiExport::_should_post_garbage_collection_start = false;
1263 bool JvmtiExport::_should_post_garbage_collection_finish = false;
1264 bool JvmtiExport::_should_post_object_free = false;
1265 bool JvmtiExport::_should_post_resource_exhausted = false;
1266 bool JvmtiExport::_should_post_vm_object_alloc = false;
1267 bool JvmtiExport::_should_post_sampled_object_alloc = false;
1268 bool JvmtiExport::_should_post_on_exceptions = false;
1269 bool JvmtiExport::_should_post_vthread_start = false;
1270 bool JvmtiExport::_should_post_vthread_end = false;
1271 bool JvmtiExport::_should_post_vthread_mount = false;
1272 bool JvmtiExport::_should_post_vthread_unmount = false;
1273
1274 ////////////////////////////////////////////////////////////////////////////////////////////////
1275
1276
1277 void JvmtiExport::check_vthread_and_suspend_at_safepoint(JavaThread *thread) {
1278 oop vt = thread->jvmti_vthread();
1279
1280 if (vt != NULL && java_lang_VirtualThread::is_instance(vt)) {
1281 int64_t id = java_lang_Thread::thread_id(vt);
1282
1283 ThreadBlockInVM tbivm(thread);
1284 MonitorLocker ml(JvmtiVTMSTransition_lock, Mutex::_no_safepoint_check_flag);
1285
1286 // block while vthread is externally suspended
1287 while (JvmtiVTSuspender::is_vthread_suspended(id)) {
1288 ml.wait();
1289 }
1290 }
1291 }
1292
1293 //
1294 // JVMTI single step management
1295 //
1296 void JvmtiExport::at_single_stepping_point(JavaThread *thread, Method* method, address location) {
1297 assert(JvmtiExport::should_post_single_step(), "must be single stepping");
1298
1299 HandleMark hm(thread);
1300 methodHandle mh(thread, method);
1301
1302 // update information about current location and post a step event
1303 JvmtiThreadState *state = thread->jvmti_thread_state();
1304 if (state == NULL) {
1305 return;
1306 }
1307 EVT_TRIG_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Trg Single Step triggered",
1308 JvmtiTrace::safe_get_thread_name(thread)));
1309 if (!state->hide_single_stepping()) {
1310 if (state->is_pending_step_for_popframe()) {
1311 state->process_pending_step_for_popframe();
1312 }
1313 if (state->is_pending_step_for_earlyret()) {
1314 state->process_pending_step_for_earlyret();
1315 }
1316 JvmtiExport::post_single_step(thread, mh(), location);
1317 }
1318 }
1319
1320
1321 void JvmtiExport::expose_single_stepping(JavaThread *thread) {
1322 JvmtiThreadState *state = thread->jvmti_thread_state();
1323 if (state != NULL) {
1324 state->clear_hide_single_stepping();
1325 }
1326 }
1327
1328
1329 bool JvmtiExport::hide_single_stepping(JavaThread *thread) {
1330 JvmtiThreadState *state = thread->jvmti_thread_state();
1331 if (state != NULL && state->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1332 state->set_hide_single_stepping();
1333 return true;
1334 } else {
1335 return false;
1336 }
1337 }
1338
1339 void JvmtiExport::post_class_load(JavaThread *thread, Klass* klass) {
1340 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1341 return;
1342 }
1343 HandleMark hm(thread);
1344
1345 JvmtiThreadState* state = thread->jvmti_thread_state();
1346 if (state == NULL) {
1347 return;
1348 }
1349 if (thread->is_in_tmp_VTMS_transition()) {
1350 return; // skip ClassLoad events in tmp VTMS transition
1351 }
1352 assert(!thread->is_in_any_VTMS_transition(), "class load events are not allowed in any VTMS transition");
1353
1354 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Trg Class Load triggered",
1355 JvmtiTrace::safe_get_thread_name(thread)));
1356 JvmtiEnvThreadStateIterator it(state);
1357 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1358 if (ets->is_enabled(JVMTI_EVENT_CLASS_LOAD)) {
1359 JvmtiEnv *env = ets->get_env();
1360 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1361 continue;
1362 }
1363 EVT_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Evt Class Load sent %s",
1364 JvmtiTrace::safe_get_thread_name(thread),
1365 klass==NULL? "NULL" : klass->external_name() ));
1366 JvmtiClassEventMark jem(thread, klass);
1367 JvmtiJavaThreadEventTransition jet(thread);
1368 jvmtiEventClassLoad callback = env->callbacks()->ClassLoad;
1369 if (callback != NULL) {
1370 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1371 }
1372 }
1373 }
1374 }
1375
1376
1377 void JvmtiExport::post_class_prepare(JavaThread *thread, Klass* klass) {
1378 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1379 return;
1380 }
1381 HandleMark hm(thread);
1382
1383 JvmtiThreadState* state = thread->jvmti_thread_state();
1384 if (state == NULL) {
1385 return;
1386 }
1387 if (thread->is_in_tmp_VTMS_transition()) {
1388 return; // skip ClassPrepare events in tmp VTMS transition
1389 }
1390 assert(!thread->is_in_any_VTMS_transition(), "class prepare events are not allowed in any VTMS transition");
1391
1392 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Trg Class Prepare triggered",
1393 JvmtiTrace::safe_get_thread_name(thread)));
1394 JvmtiEnvThreadStateIterator it(state);
1395 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1396 if (ets->is_enabled(JVMTI_EVENT_CLASS_PREPARE)) {
1397 JvmtiEnv *env = ets->get_env();
1398 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1399 continue;
1400 }
1401 EVT_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Evt Class Prepare sent %s",
1402 JvmtiTrace::safe_get_thread_name(thread),
1403 klass==NULL? "NULL" : klass->external_name() ));
1404 JvmtiClassEventMark jem(thread, klass);
1405 JvmtiJavaThreadEventTransition jet(thread);
1406 jvmtiEventClassPrepare callback = env->callbacks()->ClassPrepare;
1407 if (callback != NULL) {
1408 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1409 }
1410 }
1411 }
1412 }
1413
1414 void JvmtiExport::post_class_unload(Klass* klass) {
1415 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1416 return;
1417 }
1418
1419 // postings to the service thread so that it can perform them in a safe
1420 // context and in-order.
1421 ResourceMark rm;
1422 // JvmtiDeferredEvent copies the string.
1423 JvmtiDeferredEvent event = JvmtiDeferredEvent::class_unload_event(klass->name()->as_C_string());
1424 ServiceThread::enqueue_deferred_event(&event);
1425 }
1426
1427
1428 void JvmtiExport::post_class_unload_internal(const char* name) {
1429 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1430 return;
1431 }
1432 assert(Thread::current()->is_service_thread(), "must be called from ServiceThread");
1433 JavaThread *thread = JavaThread::current();
1434 HandleMark hm(thread);
1435
1436 EVT_TRIG_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Trg Class Unload triggered" ));
1437 if (JvmtiEventController::is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1438
1439 JvmtiEnvIterator it;
1440 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1441 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1442 continue;
1443 }
1444 if (env->is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1445 EVT_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Evt Class Unload sent %s", name));
1446
1447 JvmtiEventMark jem(thread);
1448 JvmtiJavaThreadEventTransition jet(thread);
1449 jvmtiExtensionEvent callback = env->ext_callbacks()->ClassUnload;
1450 if (callback != NULL) {
1451 (*callback)(env->jvmti_external(), jem.jni_env(), name);
1452 }
1453 }
1454 }
1455 }
1456 }
1457
1458
1459 void JvmtiExport::post_thread_start(JavaThread *thread) {
1460 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1461 return;
1462 }
1463 assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
1464
1465 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Trg Thread Start event triggered",
1466 JvmtiTrace::safe_get_thread_name(thread)));
1467
1468 // do JVMTI thread initialization (if needed)
1469 JvmtiEventController::thread_started(thread);
1470
1471 // Do not post thread start event for hidden java thread.
1472 if (JvmtiEventController::is_enabled(JVMTI_EVENT_THREAD_START) &&
1473 !thread->is_hidden_from_external_view()) {
1474 JvmtiEnvIterator it;
1475 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1476 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1477 continue;
1478 }
1479 if (env->is_enabled(JVMTI_EVENT_THREAD_START)) {
1480 EVT_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Evt Thread Start event sent",
1481 JvmtiTrace::safe_get_thread_name(thread) ));
1482
1483 JvmtiVirtualThreadEventMark jem(thread);
1484 JvmtiJavaThreadEventTransition jet(thread);
1485 jvmtiEventThreadStart callback = env->callbacks()->ThreadStart;
1486 if (callback != NULL) {
1487 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1488 }
1489 }
1490 }
1491 }
1492 }
1493
1494
1495 void JvmtiExport::post_thread_end(JavaThread *thread) {
1496 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1497 return;
1498 }
1499 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Trg Thread End event triggered",
1500 JvmtiTrace::safe_get_thread_name(thread)));
1501
1502 JvmtiThreadState *state = thread->jvmti_thread_state();
1503 if (state == NULL) {
1504 return;
1505 }
1506
1507 // Do not post thread end event for hidden java thread.
1508 if (state->is_enabled(JVMTI_EVENT_THREAD_END) &&
1509 !thread->is_hidden_from_external_view()) {
1510
1511 JvmtiEnvThreadStateIterator it(state);
1512 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1513 if (ets->is_enabled(JVMTI_EVENT_THREAD_END)) {
1514 JvmtiEnv *env = ets->get_env();
1515 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1516 continue;
1517 }
1518 EVT_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Evt Thread End event sent",
1519 JvmtiTrace::safe_get_thread_name(thread) ));
1520
1521 JvmtiVirtualThreadEventMark jem(thread);
1522 JvmtiJavaThreadEventTransition jet(thread);
1523 jvmtiEventThreadEnd callback = env->callbacks()->ThreadEnd;
1524 if (callback != NULL) {
1525 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1526 }
1527 }
1528 }
1529 }
1530 }
1531
1532
1533 void JvmtiExport::post_vthread_start(jobject vthread) {
1534 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1535 return;
1536 }
1537 EVT_TRIG_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_START, ("[%p] Trg Virtual Thread Start event triggered", vthread));
1538
1539 JavaThread *cur_thread = JavaThread::current();
1540 JvmtiThreadState *state = cur_thread->jvmti_thread_state();
1541 if (state == NULL) {
1542 return;
1543 }
1544
1545 if (state->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_START)) {
1546 JvmtiEnvThreadStateIterator it(state);
1547
1548 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1549 JvmtiEnv *env = ets->get_env();
1550 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1551 continue;
1552 }
1553 if (ets->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_START)) {
1554 EVT_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_START, ("[%p] Evt Virtual Thread Start event sent", vthread));
1555
1556 JvmtiVirtualThreadEventMark jem(cur_thread);
1557 JvmtiJavaThreadEventTransition jet(cur_thread);
1558 jvmtiEventVirtualThreadStart callback = env->callbacks()->VirtualThreadStart;
1559 if (callback != NULL) {
1560 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1561 }
1562 }
1563 }
1564 }
1565 }
1566
1567 void JvmtiExport::post_vthread_end(jobject vthread) {
1568 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1569 return;
1570 }
1571 EVT_TRIG_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_END, ("[%p] Trg Virtual Thread End event triggered", vthread));
1572
1573 JavaThread *cur_thread = JavaThread::current();
1574 JvmtiThreadState *state = cur_thread->jvmti_thread_state();
1575 if (state == NULL) {
1576 return;
1577 }
1578
1579 if (state->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_END)) {
1580 JvmtiEnvThreadStateIterator it(state);
1581
1582 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1583 JvmtiEnv *env = ets->get_env();
1584 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1585 continue;
1586 }
1587 if (ets->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_END)) {
1588 EVT_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_END, ("[%p] Evt Virtual Thread End event sent", vthread));
1589
1590 JvmtiVirtualThreadEventMark jem(cur_thread);
1591 JvmtiJavaThreadEventTransition jet(cur_thread);
1592 jvmtiEventVirtualThreadEnd callback = env->callbacks()->VirtualThreadEnd;
1593 if (callback != NULL) {
1594 (*callback)(env->jvmti_external(), jem.jni_env(), vthread);
1595 }
1596 }
1597 }
1598 }
1599 }
1600
1601 void JvmtiExport::post_vthread_mount(jobject vthread) {
1602 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1603 return;
1604 }
1605 JavaThread *thread = JavaThread::current();
1606 HandleMark hm(thread);
1607 EVT_TRIG_TRACE(EXT_EVENT_VIRTUAL_THREAD_MOUNT, ("[%p] Trg Virtual Thread Mount event triggered", vthread));
1608
1609 JvmtiThreadState *state = thread->jvmti_thread_state();
1610 if (state == NULL) {
1611 return;
1612 }
1613
1614 if (state->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_MOUNT)) {
1615 JvmtiEnvThreadStateIterator it(state);
1616
1617 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1618 JvmtiEnv *env = ets->get_env();
1619 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1620 continue;
1621 }
1622 if (ets->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_MOUNT)) {
1623 EVT_TRACE(EXT_EVENT_VIRTUAL_THREAD_MOUNT, ("[%p] Evt Virtual Thread Mount event sent", vthread));
1624
1625 JvmtiVirtualThreadEventMark jem(thread);
1626 JvmtiJavaThreadEventTransition jet(thread);
1627 jvmtiExtensionEvent callback = env->ext_callbacks()->VirtualThreadMount;
1628 if (callback != NULL) {
1629 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1630 }
1631 }
1632 }
1633 }
1634 }
1635
1636 void JvmtiExport::post_vthread_unmount(jobject vthread) {
1637 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1638 return;
1639 }
1640 JavaThread *thread = JavaThread::current();
1641 HandleMark hm(thread);
1642 EVT_TRIG_TRACE(EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, ("[%p] Trg Virtual Thread Unmount event triggered", vthread));
1643
1644 JvmtiThreadState *state = thread->jvmti_thread_state();
1645 if (state == NULL) {
1646 return;
1647 }
1648
1649 if (state->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_UNMOUNT)) {
1650 JvmtiEnvThreadStateIterator it(state);
1651
1652 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1653 JvmtiEnv *env = ets->get_env();
1654 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1655 continue;
1656 }
1657 if (ets->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_UNMOUNT)) {
1658 EVT_TRACE(EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, ("[%p] Evt Virtual Thread Unmount event sent", vthread));
1659
1660 JvmtiVirtualThreadEventMark jem(thread);
1661 JvmtiJavaThreadEventTransition jet(thread);
1662 jvmtiExtensionEvent callback = env->ext_callbacks()->VirtualThreadUnmount;
1663 if (callback != NULL) {
1664 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1665 }
1666 }
1667 }
1668 }
1669 }
1670
1671 void JvmtiExport::continuation_yield_cleanup(JavaThread* thread, jint continuation_frame_count) {
1672 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1673 return;
1674 }
1675
1676 assert(thread == JavaThread::current(), "must be");
1677 JvmtiThreadState *state = thread->jvmti_thread_state();
1678 if (state == NULL) {
1679 return;
1680 }
1681 state->invalidate_cur_stack_depth();
1682
1683 // Clear frame_pop requests in frames popped by yield
1684 if (can_post_frame_pop()) {
1685 JvmtiEnvThreadStateIterator it(state);
1686 int top_frame_num = state->cur_stack_depth() + continuation_frame_count;
1687
1688 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1689 if (!ets->has_frame_pops()) {
1690 continue;
1691 }
1692 for (int frame_idx = 0; frame_idx < continuation_frame_count; frame_idx++) {
1693 int frame_num = top_frame_num - frame_idx;
1694
1695 if (!state->is_virtual() && ets->is_frame_pop(frame_num)) {
1696 // remove the frame's entry
1697 MutexLocker mu(JvmtiThreadState_lock);
1698 ets->clear_frame_pop(frame_num);
1699 }
1700 }
1701 }
1702 }
1703 }
1704
1705 void JvmtiExport::post_object_free(JvmtiEnv* env, GrowableArray<jlong>* objects) {
1706 assert(objects != NULL, "Nothing to post");
1707
1708 JavaThread *javaThread = JavaThread::current();
1709 if (javaThread->is_in_any_VTMS_transition()) {
1710 return; // no events should be posted if thread is in any VTMS transition
1711 }
1712 if (!env->is_enabled(JVMTI_EVENT_OBJECT_FREE)) {
1713 return; // the event type has been already disabled
1714 }
1715
1716 EVT_TRIG_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Trg Object Free triggered" ));
1717 EVT_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Evt Object Free sent"));
1718
1719 JvmtiThreadEventMark jem(javaThread);
1720 JvmtiJavaThreadEventTransition jet(javaThread);
1721 jvmtiEventObjectFree callback = env->callbacks()->ObjectFree;
1722 if (callback != NULL) {
1723 for (int index = 0; index < objects->length(); index++) {
1724 (*callback)(env->jvmti_external(), objects->at(index));
1725 }
1726 }
1727 }
1728
1729 void JvmtiExport::post_resource_exhausted(jint resource_exhausted_flags, const char* description) {
1730
1731 JavaThread *thread = JavaThread::current();
1732
1733 if (thread->is_in_any_VTMS_transition()) {
1734 return; // no events should be posted if thread is in any VTMS transition
1735 }
1736
1737 log_error(jvmti)("Posting Resource Exhausted event: %s",
1738 description != nullptr ? description : "unknown");
1739
1740 // JDK-8213834: handlers of ResourceExhausted may attempt some analysis
1741 // which often requires running java.
1742 // This will cause problems on threads not able to run java, e.g. compiler
1743 // threads. To forestall these problems, we therefore suppress sending this
1744 // event from threads which are not able to run java.
1745 if (!thread->can_call_java()) {
1746 return;
1747 }
1748
1749 EVT_TRIG_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Trg resource exhausted event triggered" ));
1750
1751 JvmtiEnvIterator it;
1752 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1753 if (env->is_enabled(JVMTI_EVENT_RESOURCE_EXHAUSTED)) {
1754 EVT_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Evt resource exhausted event sent" ));
1755
1756 JvmtiThreadEventMark jem(thread);
1757 JvmtiJavaThreadEventTransition jet(thread);
1758 jvmtiEventResourceExhausted callback = env->callbacks()->ResourceExhausted;
1759 if (callback != NULL) {
1760 (*callback)(env->jvmti_external(), jem.jni_env(),
1761 resource_exhausted_flags, NULL, description);
1762 }
1763 }
1764 }
1765 }
1766
1767 void JvmtiExport::post_method_entry(JavaThread *thread, Method* method, frame current_frame) {
1768 HandleMark hm(thread);
1769 methodHandle mh(thread, method);
1770
1771 JvmtiThreadState* state = thread->jvmti_thread_state();
1772 if (state == NULL || !state->is_interp_only_mode()) {
1773 // for any thread that actually wants method entry, interp_only_mode is set
1774 return;
1775 }
1776 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1777 return; // no events should be posted if thread is in any VTMS transition
1778 }
1779 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Trg Method Entry triggered %s.%s",
1780 JvmtiTrace::safe_get_thread_name(thread),
1781 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1782 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1783
1784 state->incr_cur_stack_depth();
1785
1786 if (state->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1787 JvmtiEnvThreadStateIterator it(state);
1788 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1789 if (ets->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1790 EVT_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Evt Method Entry sent %s.%s",
1791 JvmtiTrace::safe_get_thread_name(thread),
1792 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1793 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1794
1795 JvmtiEnv *env = ets->get_env();
1796 JvmtiMethodEventMark jem(thread, mh);
1797 JvmtiJavaThreadEventTransition jet(thread);
1798 jvmtiEventMethodEntry callback = env->callbacks()->MethodEntry;
1799 if (callback != NULL) {
1800 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_methodID());
1801 }
1802 }
1803 }
1804 }
1805 }
1806
1807 void JvmtiExport::post_method_exit(JavaThread* thread, Method* method, frame current_frame) {
1808 HandleMark hm(thread);
1809 methodHandle mh(thread, method);
1810
1811 JvmtiThreadState *state = thread->jvmti_thread_state();
1812
1813 if (state == NULL || !state->is_interp_only_mode()) {
1814 // for any thread that actually wants method exit, interp_only_mode is set
1815 return;
1816 }
1817
1818 // return a flag when a method terminates by throwing an exception
1819 // i.e. if an exception is thrown and it's not caught by the current method
1820 bool exception_exit = state->is_exception_detected() && !state->is_exception_caught();
1821 Handle result;
1822 jvalue value;
1823 value.j = 0L;
1824
1825 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1826 // if the method hasn't been popped because of an exception then we populate
1827 // the return_value parameter for the callback. At this point we only have
1828 // the address of a "raw result" and we just call into the interpreter to
1829 // convert this into a jvalue.
1830 if (!exception_exit) {
1831 oop oop_result;
1832 BasicType type = current_frame.interpreter_frame_result(&oop_result, &value);
1833 if (is_reference_type(type)) {
1834 result = Handle(thread, oop_result);
1835 value.l = JNIHandles::make_local(thread, result());
1836 }
1837 }
1838 }
1839
1840 // Deferred transition to VM, so we can stash away the return oop before GC
1841 // Note that this transition is not needed when throwing an exception, because
1842 // there is no oop to retain.
1843 JavaThread* current = thread; // for JRT_BLOCK
1844 JRT_BLOCK
1845 post_method_exit_inner(thread, mh, state, exception_exit, current_frame, value);
1846 JRT_BLOCK_END
1847
1848 if (result.not_null() && !mh->is_native()) {
1849 // We have to restore the oop on the stack for interpreter frames
1850 *(oop*)current_frame.interpreter_frame_tos_address() = result();
1851 }
1852 }
1853
1854 void JvmtiExport::post_method_exit_inner(JavaThread* thread,
1855 methodHandle& mh,
1856 JvmtiThreadState *state,
1857 bool exception_exit,
1858 frame current_frame,
1859 jvalue& value) {
1860 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1861 return; // no events should be posted if thread is in any VTMS transition
1862 }
1863
1864 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Trg Method Exit triggered %s.%s",
1865 JvmtiTrace::safe_get_thread_name(thread),
1866 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1867 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1868
1869 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1870 JvmtiEnvThreadStateIterator it(state);
1871 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1872 if (ets->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1873 EVT_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Evt Method Exit sent %s.%s",
1874 JvmtiTrace::safe_get_thread_name(thread),
1875 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1876 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1877
1878 JvmtiEnv *env = ets->get_env();
1879 JvmtiMethodEventMark jem(thread, mh);
1880 JvmtiJavaThreadEventTransition jet(thread);
1881 jvmtiEventMethodExit callback = env->callbacks()->MethodExit;
1882 if (callback != NULL) {
1883 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1884 jem.jni_methodID(), exception_exit, value);
1885 }
1886 }
1887 }
1888 }
1889
1890 JvmtiEnvThreadStateIterator it(state);
1891 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1892 if (ets->has_frame_pops()) {
1893 int cur_frame_number = state->cur_stack_depth();
1894
1895 if (ets->is_frame_pop(cur_frame_number)) {
1896 // we have a NotifyFramePop entry for this frame.
1897 // now check that this env/thread wants this event
1898 if (ets->is_enabled(JVMTI_EVENT_FRAME_POP)) {
1899 EVT_TRACE(JVMTI_EVENT_FRAME_POP, ("[%s] Evt Frame Pop sent %s.%s",
1900 JvmtiTrace::safe_get_thread_name(thread),
1901 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1902 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1903
1904 // we also need to issue a frame pop event for this frame
1905 JvmtiEnv *env = ets->get_env();
1906 JvmtiMethodEventMark jem(thread, mh);
1907 JvmtiJavaThreadEventTransition jet(thread);
1908 jvmtiEventFramePop callback = env->callbacks()->FramePop;
1909 if (callback != NULL) {
1910 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1911 jem.jni_methodID(), exception_exit);
1912 }
1913 }
1914 // remove the frame's entry
1915 {
1916 MutexLocker mu(JvmtiThreadState_lock);
1917 ets->clear_frame_pop(cur_frame_number);
1918 }
1919 }
1920 }
1921 }
1922
1923 state->decr_cur_stack_depth();
1924 }
1925
1926
1927 // Todo: inline this for optimization
1928 void JvmtiExport::post_single_step(JavaThread *thread, Method* method, address location) {
1929 HandleMark hm(thread);
1930 methodHandle mh(thread, method);
1931
1932 JvmtiThreadState *state = thread->jvmti_thread_state();
1933 if (state == NULL) {
1934 return;
1935 }
1936 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1937 return; // no events should be posted if thread is in any VTMS transition
1938 }
1939
1940 JvmtiEnvThreadStateIterator it(state);
1941 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1942 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_SINGLE_STEP);
1943 if (!ets->single_stepping_posted() && ets->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1944 EVT_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Evt Single Step sent %s.%s @ " INTX_FORMAT,
1945 JvmtiTrace::safe_get_thread_name(thread),
1946 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1947 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1948 location - mh()->code_base() ));
1949
1950 JvmtiEnv *env = ets->get_env();
1951 JvmtiLocationEventMark jem(thread, mh, location);
1952 JvmtiJavaThreadEventTransition jet(thread);
1953 jvmtiEventSingleStep callback = env->callbacks()->SingleStep;
1954 if (callback != NULL) {
1955 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1956 jem.jni_methodID(), jem.location());
1957 }
1958
1959 ets->set_single_stepping_posted();
1960 }
1961 }
1962 }
1963
1964 void JvmtiExport::post_exception_throw(JavaThread *thread, Method* method, address location, oop exception) {
1965 HandleMark hm(thread);
1966 methodHandle mh(thread, method);
1967 Handle exception_handle(thread, exception);
1968 // The KeepStackGCProcessedMark below keeps the target thread and its stack fully
1969 // GC processed across this scope. This is needed because there is a stack walk
1970 // below with safepoint polls inside of it. After such safepoints, we have to
1971 // ensure the stack is sufficiently processed.
1972 KeepStackGCProcessedMark ksgcpm(thread);
1973
1974 JvmtiThreadState *state = thread->jvmti_thread_state();
1975 if (state == NULL) {
1976 return;
1977 }
1978 if (thread->is_in_any_VTMS_transition()) {
1979 return; // no events should be posted if thread is in any VTMS transition
1980 }
1981
1982 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION, ("[%s] Trg Exception thrown triggered",
1983 JvmtiTrace::safe_get_thread_name(thread)));
1984 if (!state->is_exception_detected()) {
1985 state->set_exception_detected();
1986 JvmtiEnvThreadStateIterator it(state);
1987 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1988 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION) && (exception != NULL)) {
1989
1990 EVT_TRACE(JVMTI_EVENT_EXCEPTION,
1991 ("[%s] Evt Exception thrown sent %s.%s @ " INTX_FORMAT,
1992 JvmtiTrace::safe_get_thread_name(thread),
1993 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1994 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1995 location - mh()->code_base() ));
1996
1997 JvmtiEnv *env = ets->get_env();
1998 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
1999
2000 // It's okay to clear these exceptions here because we duplicate
2001 // this lookup in InterpreterRuntime::exception_handler_for_exception.
2002 EXCEPTION_MARK;
2003
2004 bool should_repeat;
2005 vframeStream st(thread);
2006 assert(!st.at_end(), "cannot be at end");
2007 Method* current_method = NULL;
2008 // A GC may occur during the Method::fast_exception_handler_bci_for()
2009 // call below if it needs to load the constraint class. Using a
2010 // methodHandle to keep the 'current_method' from being deallocated
2011 // if GC happens.
2012 methodHandle current_mh = methodHandle(thread, current_method);
2013 int current_bci = -1;
2014 do {
2015 current_method = st.method();
2016 current_mh = methodHandle(thread, current_method);
2017 current_bci = st.bci();
2018 do {
2019 should_repeat = false;
2020 Klass* eh_klass = exception_handle()->klass();
2021 current_bci = Method::fast_exception_handler_bci_for(
2022 current_mh, eh_klass, current_bci, THREAD);
2023 if (HAS_PENDING_EXCEPTION) {
2024 exception_handle = Handle(thread, PENDING_EXCEPTION);
2025 CLEAR_PENDING_EXCEPTION;
2026 should_repeat = true;
2027 }
2028 } while (should_repeat && (current_bci != -1));
2029 st.next();
2030 } while ((current_bci < 0) && (!st.at_end()));
2031
2032 jmethodID catch_jmethodID;
2033 if (current_bci < 0) {
2034 catch_jmethodID = 0;
2035 current_bci = 0;
2036 } else {
2037 catch_jmethodID = jem.to_jmethodID(current_mh);
2038 }
2039
2040 JvmtiJavaThreadEventTransition jet(thread);
2041 jvmtiEventException callback = env->callbacks()->Exception;
2042 if (callback != NULL) {
2043 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2044 jem.jni_methodID(), jem.location(),
2045 jem.exception(),
2046 catch_jmethodID, current_bci);
2047 }
2048 }
2049 }
2050 }
2051
2052 // frames may get popped because of this throw, be safe - invalidate cached depth
2053 state->invalidate_cur_stack_depth();
2054 }
2055
2056
2057 void JvmtiExport::notice_unwind_due_to_exception(JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) {
2058 HandleMark hm(thread);
2059 methodHandle mh(thread, method);
2060 Handle exception_handle(thread, exception);
2061
2062 JvmtiThreadState *state = thread->jvmti_thread_state();
2063 if (state == NULL) {
2064 return;
2065 }
2066 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
2067 ("[%s] Trg unwind_due_to_exception triggered %s.%s @ %s" INTX_FORMAT " - %s",
2068 JvmtiTrace::safe_get_thread_name(thread),
2069 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
2070 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
2071 location==0? "no location:" : "",
2072 location==0? 0 : location - mh()->code_base(),
2073 in_handler_frame? "in handler frame" : "not handler frame" ));
2074
2075 if (state->is_exception_detected()) {
2076
2077 state->invalidate_cur_stack_depth();
2078 if (!in_handler_frame) {
2079 // Not in exception handler.
2080 if(state->is_interp_only_mode()) {
2081 // method exit and frame pop events are posted only in interp mode.
2082 // When these events are enabled code should be in running in interp mode.
2083 jvalue no_value;
2084 no_value.j = 0L;
2085 JvmtiExport::post_method_exit_inner(thread, mh, state, true, thread->last_frame(), no_value);
2086 // The cached cur_stack_depth might have changed from the
2087 // operations of frame pop or method exit. We are not 100% sure
2088 // the cached cur_stack_depth is still valid depth so invalidate
2089 // it.
2090 state->invalidate_cur_stack_depth();
2091 }
2092 } else {
2093 // In exception handler frame. Report exception catch.
2094 assert(location != NULL, "must be a known location");
2095 // Update cur_stack_depth - the frames above the current frame
2096 // have been unwound due to this exception:
2097 assert(!state->is_exception_caught(), "exception must not be caught yet.");
2098 state->set_exception_caught();
2099
2100 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
2101 return; // no events should be posted if thread is in any VTMS transition
2102 }
2103 JvmtiEnvThreadStateIterator it(state);
2104 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2105 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION_CATCH) && (exception_handle() != NULL)) {
2106 EVT_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
2107 ("[%s] Evt ExceptionCatch sent %s.%s @ " INTX_FORMAT,
2108 JvmtiTrace::safe_get_thread_name(thread),
2109 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
2110 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
2111 location - mh()->code_base() ));
2112
2113 JvmtiEnv *env = ets->get_env();
2114 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
2115 JvmtiJavaThreadEventTransition jet(thread);
2116 jvmtiEventExceptionCatch callback = env->callbacks()->ExceptionCatch;
2117 if (callback != NULL) {
2118 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2119 jem.jni_methodID(), jem.location(),
2120 jem.exception());
2121 }
2122 }
2123 }
2124 }
2125 }
2126 }
2127
2128 oop JvmtiExport::jni_GetField_probe(JavaThread *thread, jobject jobj, oop obj,
2129 Klass* klass, jfieldID fieldID, bool is_static) {
2130 if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) {
2131 // At least one field access watch is set so we have more work to do.
2132 post_field_access_by_jni(thread, obj, klass, fieldID, is_static);
2133 // event posting can block so refetch oop if we were passed a jobj
2134 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
2135 }
2136 return obj;
2137 }
2138
2139 void JvmtiExport::post_field_access_by_jni(JavaThread *thread, oop obj,
2140 Klass* klass, jfieldID fieldID, bool is_static) {
2141 // We must be called with a Java context in order to provide reasonable
2142 // values for the klazz, method, and location fields. The callers of this
2143 // function don't make the call unless there is a Java context.
2144 assert(thread->has_last_Java_frame(), "must be called with a Java context");
2145
2146 if (thread->is_in_any_VTMS_transition()) {
2147 return; // no events should be posted if thread is in any VTMS transition
2148 }
2149
2150 ResourceMark rm;
2151 fieldDescriptor fd;
2152 // if get_field_descriptor finds fieldID to be invalid, then we just bail
2153 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
2154 assert(valid_fieldID == true,"post_field_access_by_jni called with invalid fieldID");
2155 if (!valid_fieldID) return;
2156 // field accesses are not watched so bail
2157 if (!fd.is_field_access_watched()) return;
2158
2159 HandleMark hm(thread);
2160 Handle h_obj;
2161 if (!is_static) {
2162 // non-static field accessors have an object, but we need a handle
2163 assert(obj != NULL, "non-static needs an object");
2164 h_obj = Handle(thread, obj);
2165 }
2166 post_field_access(thread,
2167 thread->last_frame().interpreter_frame_method(),
2168 thread->last_frame().interpreter_frame_bcp(),
2169 klass, h_obj, fieldID);
2170 }
2171
2172 void JvmtiExport::post_field_access(JavaThread *thread, Method* method,
2173 address location, Klass* field_klass, Handle object, jfieldID field) {
2174
2175 HandleMark hm(thread);
2176 methodHandle mh(thread, method);
2177
2178 JvmtiThreadState *state = thread->jvmti_thread_state();
2179 if (state == NULL) {
2180 return;
2181 }
2182 if (thread->is_in_any_VTMS_transition()) {
2183 return; // no events should be posted if thread is in any VTMS transition
2184 }
2185
2186 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Trg Field Access event triggered",
2187 JvmtiTrace::safe_get_thread_name(thread)));
2188 JvmtiEnvThreadStateIterator it(state);
2189 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2190 if (ets->is_enabled(JVMTI_EVENT_FIELD_ACCESS)) {
2191 EVT_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Evt Field Access event sent %s.%s @ " INTX_FORMAT,
2192 JvmtiTrace::safe_get_thread_name(thread),
2193 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
2194 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
2195 location - mh()->code_base() ));
2196
2197 JvmtiEnv *env = ets->get_env();
2198 JvmtiLocationEventMark jem(thread, mh, location);
2199 jclass field_jclass = jem.to_jclass(field_klass);
2200 jobject field_jobject = jem.to_jobject(object());
2201 JvmtiJavaThreadEventTransition jet(thread);
2202 jvmtiEventFieldAccess callback = env->callbacks()->FieldAccess;
2203 if (callback != NULL) {
2204 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2205 jem.jni_methodID(), jem.location(),
2206 field_jclass, field_jobject, field);
2207 }
2208 }
2209 }
2210 }
2211
2212 oop JvmtiExport::jni_SetField_probe(JavaThread *thread, jobject jobj, oop obj,
2213 Klass* klass, jfieldID fieldID, bool is_static,
2214 char sig_type, jvalue *value) {
2215 if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) {
2216 // At least one field modification watch is set so we have more work to do.
2217 post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value);
2218 // event posting can block so refetch oop if we were passed a jobj
2219 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
2220 }
2221 return obj;
2222 }
2223
2224 void JvmtiExport::post_field_modification_by_jni(JavaThread *thread, oop obj,
2225 Klass* klass, jfieldID fieldID, bool is_static,
2226 char sig_type, jvalue *value) {
2227 // We must be called with a Java context in order to provide reasonable
2228 // values for the klazz, method, and location fields. The callers of this
2229 // function don't make the call unless there is a Java context.
2230 assert(thread->has_last_Java_frame(), "must be called with Java context");
2231
2232 if (thread->is_in_any_VTMS_transition()) {
2233 return; // no events should be posted if thread is in any VTMS transition
2234 }
2235
2236 ResourceMark rm;
2237 fieldDescriptor fd;
2238 // if get_field_descriptor finds fieldID to be invalid, then we just bail
2239 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
2240 assert(valid_fieldID == true,"post_field_modification_by_jni called with invalid fieldID");
2241 if (!valid_fieldID) return;
2242 // field modifications are not watched so bail
2243 if (!fd.is_field_modification_watched()) return;
2244
2245 HandleMark hm(thread);
2246
2247 Handle h_obj;
2248 if (!is_static) {
2249 // non-static field accessors have an object, but we need a handle
2250 assert(obj != NULL, "non-static needs an object");
2251 h_obj = Handle(thread, obj);
2252 }
2253 post_field_modification(thread,
2254 thread->last_frame().interpreter_frame_method(),
2255 thread->last_frame().interpreter_frame_bcp(),
2256 klass, h_obj, fieldID, sig_type, value);
2257 }
2258
2259 void JvmtiExport::post_raw_field_modification(JavaThread *thread, Method* method,
2260 address location, Klass* field_klass, Handle object, jfieldID field,
2261 char sig_type, jvalue *value) {
2262
2263 if (thread->is_in_any_VTMS_transition()) {
2264 return; // no events should be posted if thread is in any VTMS transition
2265 }
2266
2267 if (sig_type == JVM_SIGNATURE_INT || sig_type == JVM_SIGNATURE_BOOLEAN ||
2268 sig_type == JVM_SIGNATURE_BYTE || sig_type == JVM_SIGNATURE_CHAR ||
2269 sig_type == JVM_SIGNATURE_SHORT) {
2270 // 'I' instructions are used for byte, char, short and int.
2271 // determine which it really is, and convert
2272 fieldDescriptor fd;
2273 bool found = JvmtiEnv::get_field_descriptor(field_klass, field, &fd);
2274 // should be found (if not, leave as is)
2275 if (found) {
2276 jint ival = value->i;
2277 // convert value from int to appropriate type
2278 switch (fd.field_type()) {
2279 case T_BOOLEAN:
2280 sig_type = JVM_SIGNATURE_BOOLEAN;
2281 value->i = 0; // clear it
2282 value->z = (jboolean)ival;
2283 break;
2284 case T_BYTE:
2285 sig_type = JVM_SIGNATURE_BYTE;
2286 value->i = 0; // clear it
2287 value->b = (jbyte)ival;
2288 break;
2289 case T_CHAR:
2290 sig_type = JVM_SIGNATURE_CHAR;
2291 value->i = 0; // clear it
2292 value->c = (jchar)ival;
2293 break;
2294 case T_SHORT:
2295 sig_type = JVM_SIGNATURE_SHORT;
2296 value->i = 0; // clear it
2297 value->s = (jshort)ival;
2298 break;
2299 case T_INT:
2300 // nothing to do
2301 break;
2302 default:
2303 // this is an integer instruction, should be one of above
2304 ShouldNotReachHere();
2305 break;
2306 }
2307 }
2308 }
2309
2310 assert(sig_type != JVM_SIGNATURE_ARRAY, "array should have sig_type == 'L'");
2311 bool handle_created = false;
2312
2313 // convert oop to JNI handle.
2314 if (sig_type == JVM_SIGNATURE_CLASS || sig_type == JVM_SIGNATURE_PRIMITIVE_OBJECT) {
2315 handle_created = true;
2316 value->l = (jobject)JNIHandles::make_local(thread, cast_to_oop(value->l));
2317 }
2318
2319 post_field_modification(thread, method, location, field_klass, object, field, sig_type, value);
2320
2321 // Destroy the JNI handle allocated above.
2322 if (handle_created) {
2323 JNIHandles::destroy_local(value->l);
2324 }
2325 }
2326
2327 void JvmtiExport::post_field_modification(JavaThread *thread, Method* method,
2328 address location, Klass* field_klass, Handle object, jfieldID field,
2329 char sig_type, jvalue *value_ptr) {
2330
2331 HandleMark hm(thread);
2332 methodHandle mh(thread, method);
2333
2334 JvmtiThreadState *state = thread->jvmti_thread_state();
2335 if (state == NULL) {
2336 return;
2337 }
2338 if (thread->is_in_any_VTMS_transition()) {
2339 return; // no events should be posted if thread is in any VTMS transition
2340 }
2341
2342 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
2343 ("[%s] Trg Field Modification event triggered",
2344 JvmtiTrace::safe_get_thread_name(thread)));
2345 JvmtiEnvThreadStateIterator it(state);
2346 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2347 if (ets->is_enabled(JVMTI_EVENT_FIELD_MODIFICATION)) {
2348 EVT_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
2349 ("[%s] Evt Field Modification event sent %s.%s @ " INTX_FORMAT,
2350 JvmtiTrace::safe_get_thread_name(thread),
2351 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
2352 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
2353 location - mh()->code_base() ));
2354
2355 JvmtiEnv *env = ets->get_env();
2356 JvmtiLocationEventMark jem(thread, mh, location);
2357 jclass field_jclass = jem.to_jclass(field_klass);
2358 jobject field_jobject = jem.to_jobject(object());
2359 JvmtiJavaThreadEventTransition jet(thread);
2360 jvmtiEventFieldModification callback = env->callbacks()->FieldModification;
2361 if (callback != NULL) {
2362 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2363 jem.jni_methodID(), jem.location(),
2364 field_jclass, field_jobject, field, sig_type, *value_ptr);
2365 }
2366 }
2367 }
2368 }
2369
2370 void JvmtiExport::post_native_method_bind(Method* method, address* function_ptr) {
2371 JavaThread* thread = JavaThread::current();
2372 assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
2373
2374 HandleMark hm(thread);
2375 methodHandle mh(thread, method);
2376
2377 if (thread->is_in_any_VTMS_transition()) {
2378 return; // no events should be posted if thread is in any VTMS transition
2379 }
2380 EVT_TRIG_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Trg Native Method Bind event triggered",
2381 JvmtiTrace::safe_get_thread_name(thread)));
2382
2383 if (JvmtiEventController::is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
2384 JvmtiEnvIterator it;
2385 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2386 if (env->is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
2387 EVT_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Evt Native Method Bind event sent",
2388 JvmtiTrace::safe_get_thread_name(thread) ));
2389
2390 JvmtiMethodEventMark jem(thread, mh);
2391 JvmtiJavaThreadEventTransition jet(thread);
2392 JNIEnv* jni_env = (env->phase() == JVMTI_PHASE_PRIMORDIAL) ? NULL : jem.jni_env();
2393 jvmtiEventNativeMethodBind callback = env->callbacks()->NativeMethodBind;
2394 if (callback != NULL) {
2395 (*callback)(env->jvmti_external(), jni_env, jem.jni_thread(),
2396 jem.jni_methodID(), (void*)(*function_ptr), (void**)function_ptr);
2397 }
2398 }
2399 }
2400 }
2401 }
2402
2403 // Returns a record containing inlining information for the given nmethod
2404 jvmtiCompiledMethodLoadInlineRecord* create_inline_record(nmethod* nm) {
2405 jint numstackframes = 0;
2406 jvmtiCompiledMethodLoadInlineRecord* record = (jvmtiCompiledMethodLoadInlineRecord*)NEW_RESOURCE_OBJ(jvmtiCompiledMethodLoadInlineRecord);
2407 record->header.kind = JVMTI_CMLR_INLINE_INFO;
2408 record->header.next = NULL;
2409 record->header.majorinfoversion = JVMTI_CMLR_MAJOR_VERSION_1;
2410 record->header.minorinfoversion = JVMTI_CMLR_MINOR_VERSION_0;
2411 record->numpcs = 0;
2412 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
2413 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
2414 record->numpcs++;
2415 }
2416 record->pcinfo = (PCStackInfo*)(NEW_RESOURCE_ARRAY(PCStackInfo, record->numpcs));
2417 int scope = 0;
2418 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
2419 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
2420 void* pc_address = (void*)p->real_pc(nm);
2421 assert(pc_address != NULL, "pc_address must be non-null");
2422 record->pcinfo[scope].pc = pc_address;
2423 numstackframes=0;
2424 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != NULL;sd = sd->sender()) {
2425 numstackframes++;
2426 }
2427 assert(numstackframes != 0, "numstackframes must be nonzero.");
2428 record->pcinfo[scope].methods = (jmethodID *)NEW_RESOURCE_ARRAY(jmethodID, numstackframes);
2429 record->pcinfo[scope].bcis = (jint *)NEW_RESOURCE_ARRAY(jint, numstackframes);
2430 record->pcinfo[scope].numstackframes = numstackframes;
2431 int stackframe = 0;
2432 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != NULL;sd = sd->sender()) {
2433 // sd->method() can be NULL for stubs but not for nmethods. To be completely robust, include an assert that we should never see a null sd->method()
2434 guarantee(sd->method() != NULL, "sd->method() cannot be null.");
2435 record->pcinfo[scope].methods[stackframe] = sd->method()->jmethod_id();
2436 record->pcinfo[scope].bcis[stackframe] = sd->bci();
2437 stackframe++;
2438 }
2439 scope++;
2440 }
2441 return record;
2442 }
2443
2444 void JvmtiExport::post_compiled_method_load(nmethod *nm) {
2445 guarantee(!nm->is_unloading(), "nmethod isn't unloaded or unloading");
2446 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
2447 return;
2448 }
2449 JavaThread* thread = JavaThread::current();
2450
2451 assert(!thread->is_in_any_VTMS_transition(), "compiled method load events are not allowed in any VTMS transition");
2452
2453 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2454 ("[%s] method compile load event triggered",
2455 JvmtiTrace::safe_get_thread_name(thread)));
2456
2457 JvmtiEnvIterator it;
2458 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2459 post_compiled_method_load(env, nm);
2460 }
2461 }
2462
2463 // post a COMPILED_METHOD_LOAD event for a given environment
2464 void JvmtiExport::post_compiled_method_load(JvmtiEnv* env, nmethod *nm) {
2465 if (env->phase() == JVMTI_PHASE_PRIMORDIAL || !env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) {
2466 return;
2467 }
2468 jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad;
2469 if (callback == NULL) {
2470 return;
2471 }
2472 JavaThread* thread = JavaThread::current();
2473
2474 assert(!thread->is_in_any_VTMS_transition(), "compiled method load events are not allowed in any VTMS transition");
2475
2476 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2477 ("[%s] method compile load event sent %s.%s ",
2478 JvmtiTrace::safe_get_thread_name(thread),
2479 (nm->method() == NULL) ? "NULL" : nm->method()->klass_name()->as_C_string(),
2480 (nm->method() == NULL) ? "NULL" : nm->method()->name()->as_C_string()));
2481 ResourceMark rm(thread);
2482 HandleMark hm(thread);
2483
2484 // Add inlining information
2485 jvmtiCompiledMethodLoadInlineRecord* inlinerecord = create_inline_record(nm);
2486 // Pass inlining information through the void pointer
2487 JvmtiCompiledMethodLoadEventMark jem(thread, nm, inlinerecord);
2488 JvmtiJavaThreadEventTransition jet(thread);
2489 (*callback)(env->jvmti_external(), jem.jni_methodID(),
2490 jem.code_size(), jem.code_data(), jem.map_length(),
2491 jem.map(), jem.compile_info());
2492 }
2493
2494 void JvmtiExport::post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) {
2495 assert(name != NULL && name[0] != '\0', "sanity check");
2496
2497 JavaThread* thread = JavaThread::current();
2498
2499 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition");
2500
2501 // In theory everyone coming thru here is in_vm but we need to be certain
2502 // because a callee will do a vm->native transition
2503 ThreadInVMfromUnknown __tiv;
2504
2505 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2506 ("[%s] method dynamic code generated event triggered",
2507 JvmtiTrace::safe_get_thread_name(thread)));
2508 JvmtiEnvIterator it;
2509 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2510 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
2511 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2512 ("[%s] dynamic code generated event sent for %s",
2513 JvmtiTrace::safe_get_thread_name(thread), name));
2514 JvmtiEventMark jem(thread);
2515 JvmtiJavaThreadEventTransition jet(thread);
2516 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
2517 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
2518 if (callback != NULL) {
2519 (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
2520 }
2521 }
2522 }
2523 }
2524
2525 void JvmtiExport::post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) {
2526 jvmtiPhase phase = JvmtiEnv::get_phase();
2527 if (phase == JVMTI_PHASE_PRIMORDIAL || phase == JVMTI_PHASE_START) {
2528 post_dynamic_code_generated_internal(name, code_begin, code_end);
2529 } else {
2530 // It may not be safe to post the event from this thread. Defer all
2531 // postings to the service thread so that it can perform them in a safe
2532 // context and in-order.
2533 JvmtiDeferredEvent event = JvmtiDeferredEvent::dynamic_code_generated_event(
2534 name, code_begin, code_end);
2535 ServiceThread::enqueue_deferred_event(&event);
2536 }
2537 }
2538
2539
2540 // post a DYNAMIC_CODE_GENERATED event for a given environment
2541 // used by GenerateEvents
2542 void JvmtiExport::post_dynamic_code_generated(JvmtiEnv* env, const char *name,
2543 const void *code_begin, const void *code_end)
2544 {
2545 JavaThread* thread = JavaThread::current();
2546
2547 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition");
2548
2549 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2550 ("[%s] dynamic code generated event triggered (by GenerateEvents)",
2551 JvmtiTrace::safe_get_thread_name(thread)));
2552 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
2553 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2554 ("[%s] dynamic code generated event sent for %s",
2555 JvmtiTrace::safe_get_thread_name(thread), name));
2556 JvmtiEventMark jem(thread);
2557 JvmtiJavaThreadEventTransition jet(thread);
2558 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
2559 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
2560 if (callback != NULL) {
2561 (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
2562 }
2563 }
2564 }
2565
2566 // post a DynamicCodeGenerated event while holding locks in the VM.
2567 void JvmtiExport::post_dynamic_code_generated_while_holding_locks(const char* name,
2568 address code_begin, address code_end)
2569 {
2570 JavaThread* thread = JavaThread::current();
2571 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition");
2572
2573 // register the stub with the current dynamic code event collector
2574 // Cannot take safepoint here so do not use state_for to get
2575 // jvmti thread state.
2576 // The collector and/or state might be NULL if JvmtiDynamicCodeEventCollector
2577 // has been initialized while JVMTI_EVENT_DYNAMIC_CODE_GENERATED was disabled.
2578 JvmtiThreadState* state = thread->jvmti_thread_state();
2579 if (state != NULL) {
2580 JvmtiDynamicCodeEventCollector *collector = state->get_dynamic_code_event_collector();
2581 if (collector != NULL) {
2582 collector->register_stub(name, code_begin, code_end);
2583 }
2584 }
2585 }
2586
2587 // Collect all the vm internally allocated objects which are visible to java world
2588 void JvmtiExport::record_vm_internal_object_allocation(oop obj) {
2589 Thread* thread = Thread::current_or_null();
2590 if (thread != NULL && thread->is_Java_thread()) {
2591 // Can not take safepoint here.
2592 NoSafepointVerifier no_sfpt;
2593 // Cannot take safepoint here so do not use state_for to get
2594 // jvmti thread state.
2595 JvmtiThreadState *state = JavaThread::cast(thread)->jvmti_thread_state();
2596 if (state != NULL) {
2597 // state is non NULL when VMObjectAllocEventCollector is enabled.
2598 JvmtiVMObjectAllocEventCollector *collector;
2599 collector = state->get_vm_object_alloc_event_collector();
2600 if (collector != NULL && collector->is_enabled()) {
2601 // Don't record classes as these will be notified via the ClassLoad
2602 // event.
2603 if (obj->klass() != vmClasses::Class_klass()) {
2604 collector->record_allocation(obj);
2605 }
2606 }
2607 }
2608 }
2609 }
2610
2611 // Collect all the sampled allocated objects.
2612 void JvmtiExport::record_sampled_internal_object_allocation(oop obj) {
2613 Thread* thread = Thread::current_or_null();
2614 if (thread != NULL && thread->is_Java_thread()) {
2615 // Can not take safepoint here.
2616 NoSafepointVerifier no_sfpt;
2617 // Cannot take safepoint here so do not use state_for to get
2618 // jvmti thread state.
2619 JvmtiThreadState *state = JavaThread::cast(thread)->jvmti_thread_state();
2620 if (state != NULL) {
2621 // state is non NULL when SampledObjectAllocEventCollector is enabled.
2622 JvmtiSampledObjectAllocEventCollector *collector;
2623 collector = state->get_sampled_object_alloc_event_collector();
2624
2625 if (collector != NULL && collector->is_enabled()) {
2626 collector->record_allocation(obj);
2627 }
2628 }
2629 }
2630 }
2631
2632 void JvmtiExport::post_garbage_collection_finish() {
2633 Thread *thread = Thread::current(); // this event is posted from VM-Thread.
2634 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
2635 ("[%s] garbage collection finish event triggered",
2636 JvmtiTrace::safe_get_thread_name(thread)));
2637 JvmtiEnvIterator it;
2638 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2639 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH)) {
2640 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
2641 ("[%s] garbage collection finish event sent",
2642 JvmtiTrace::safe_get_thread_name(thread)));
2643 JvmtiThreadEventTransition jet(thread);
2644 // JNIEnv is NULL here because this event is posted from VM Thread
2645 jvmtiEventGarbageCollectionFinish callback = env->callbacks()->GarbageCollectionFinish;
2646 if (callback != NULL) {
2647 (*callback)(env->jvmti_external());
2648 }
2649 }
2650 }
2651 }
2652
2653 void JvmtiExport::post_garbage_collection_start() {
2654 Thread* thread = Thread::current(); // this event is posted from vm-thread.
2655 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
2656 ("[%s] garbage collection start event triggered",
2657 JvmtiTrace::safe_get_thread_name(thread)));
2658 JvmtiEnvIterator it;
2659 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2660 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_START)) {
2661 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
2662 ("[%s] garbage collection start event sent",
2663 JvmtiTrace::safe_get_thread_name(thread)));
2664 JvmtiThreadEventTransition jet(thread);
2665 // JNIEnv is NULL here because this event is posted from VM Thread
2666 jvmtiEventGarbageCollectionStart callback = env->callbacks()->GarbageCollectionStart;
2667 if (callback != NULL) {
2668 (*callback)(env->jvmti_external());
2669 }
2670 }
2671 }
2672 }
2673
2674 void JvmtiExport::post_data_dump() {
2675 Thread *thread = Thread::current();
2676 EVT_TRIG_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
2677 ("[%s] data dump request event triggered",
2678 JvmtiTrace::safe_get_thread_name(thread)));
2679 JvmtiEnvIterator it;
2680 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2681 if (env->is_enabled(JVMTI_EVENT_DATA_DUMP_REQUEST)) {
2682 EVT_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
2683 ("[%s] data dump request event sent",
2684 JvmtiTrace::safe_get_thread_name(thread)));
2685 JvmtiThreadEventTransition jet(thread);
2686 // JNIEnv is NULL here because this event is posted from VM Thread
2687 jvmtiEventDataDumpRequest callback = env->callbacks()->DataDumpRequest;
2688 if (callback != NULL) {
2689 (*callback)(env->jvmti_external());
2690 }
2691 }
2692 }
2693 }
2694
2695 void JvmtiExport::post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) {
2696 oop object = obj_mntr->object();
2697 JvmtiThreadState *state = thread->jvmti_thread_state();
2698 if (state == NULL) {
2699 return;
2700 }
2701 if (thread->is_in_any_VTMS_transition()) {
2702 return; // no events should be posted if thread is in any VTMS transition
2703 }
2704
2705 HandleMark hm(thread);
2706 Handle h(thread, object);
2707
2708 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2709 ("[%s] monitor contended enter event triggered",
2710 JvmtiTrace::safe_get_thread_name(thread)));
2711 JvmtiEnvThreadStateIterator it(state);
2712 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2713 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTER)) {
2714 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2715 ("[%s] monitor contended enter event sent",
2716 JvmtiTrace::safe_get_thread_name(thread)));
2717 JvmtiMonitorEventMark jem(thread, h());
2718 JvmtiEnv *env = ets->get_env();
2719 JvmtiThreadEventTransition jet(thread);
2720 jvmtiEventMonitorContendedEnter callback = env->callbacks()->MonitorContendedEnter;
2721 if (callback != NULL) {
2722 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2723 }
2724 }
2725 }
2726 }
2727
2728 void JvmtiExport::post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) {
2729 oop object = obj_mntr->object();
2730 JvmtiThreadState *state = thread->jvmti_thread_state();
2731 if (state == NULL) {
2732 return;
2733 }
2734 if (thread->is_in_any_VTMS_transition()) {
2735 return; // no events should be posted if thread is in any VTMS transition
2736 }
2737
2738 HandleMark hm(thread);
2739 Handle h(thread, object);
2740
2741 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2742 ("[%s] monitor contended entered event triggered",
2743 JvmtiTrace::safe_get_thread_name(thread)));
2744
2745 JvmtiEnvThreadStateIterator it(state);
2746 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2747 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED)) {
2748 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2749 ("[%s] monitor contended enter event sent",
2750 JvmtiTrace::safe_get_thread_name(thread)));
2751 JvmtiMonitorEventMark jem(thread, h());
2752 JvmtiEnv *env = ets->get_env();
2753 JvmtiThreadEventTransition jet(thread);
2754 jvmtiEventMonitorContendedEntered callback = env->callbacks()->MonitorContendedEntered;
2755 if (callback != NULL) {
2756 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2757 }
2758 }
2759 }
2760 }
2761
2762 void JvmtiExport::post_monitor_wait(JavaThread *thread, oop object,
2763 jlong timeout) {
2764 JvmtiThreadState *state = thread->jvmti_thread_state();
2765 if (state == NULL) {
2766 return;
2767 }
2768 if (thread->is_in_any_VTMS_transition()) {
2769 return; // no events should be posted if thread is in any VTMS transition
2770 }
2771
2772 HandleMark hm(thread);
2773 Handle h(thread, object);
2774
2775 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2776 ("[%s] monitor wait event triggered",
2777 JvmtiTrace::safe_get_thread_name(thread)));
2778 JvmtiEnvThreadStateIterator it(state);
2779 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2780 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAIT)) {
2781 EVT_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2782 ("[%s] monitor wait event sent",
2783 JvmtiTrace::safe_get_thread_name(thread)));
2784 JvmtiMonitorEventMark jem(thread, h());
2785 JvmtiEnv *env = ets->get_env();
2786 JvmtiThreadEventTransition jet(thread);
2787 jvmtiEventMonitorWait callback = env->callbacks()->MonitorWait;
2788 if (callback != NULL) {
2789 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2790 jem.jni_object(), timeout);
2791 }
2792 }
2793 }
2794 }
2795
2796 void JvmtiExport::post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) {
2797 oop object = obj_mntr->object();
2798 JvmtiThreadState *state = thread->jvmti_thread_state();
2799 if (state == NULL) {
2800 return;
2801 }
2802 if (thread->is_in_any_VTMS_transition()) {
2803 return; // no events should be posted if thread is in any VTMS transition
2804 }
2805
2806 HandleMark hm(thread);
2807 Handle h(thread, object);
2808
2809 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2810 ("[%s] monitor waited event triggered",
2811 JvmtiTrace::safe_get_thread_name(thread)));
2812 JvmtiEnvThreadStateIterator it(state);
2813 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2814 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAITED)) {
2815 EVT_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2816 ("[%s] monitor waited event sent",
2817 JvmtiTrace::safe_get_thread_name(thread)));
2818 JvmtiMonitorEventMark jem(thread, h());
2819 JvmtiEnv *env = ets->get_env();
2820 JvmtiThreadEventTransition jet(thread);
2821 jvmtiEventMonitorWaited callback = env->callbacks()->MonitorWaited;
2822 if (callback != NULL) {
2823 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2824 jem.jni_object(), timed_out);
2825 }
2826 }
2827 }
2828 }
2829
2830 void JvmtiExport::post_vm_object_alloc(JavaThread *thread, oop object) {
2831 if (object == NULL) {
2832 return;
2833 }
2834 if (thread->is_in_any_VTMS_transition()) {
2835 return; // no events should be posted if thread is in any VTMS transition
2836 }
2837 HandleMark hm(thread);
2838 Handle h(thread, object);
2839
2840 EVT_TRIG_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Trg vm object alloc triggered",
2841 JvmtiTrace::safe_get_thread_name(thread)));
2842 JvmtiEnvIterator it;
2843 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2844 if (env->is_enabled(JVMTI_EVENT_VM_OBJECT_ALLOC)) {
2845 EVT_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Evt vmobject alloc sent %s",
2846 JvmtiTrace::safe_get_thread_name(thread),
2847 object==NULL? "NULL" : object->klass()->external_name()));
2848
2849 JvmtiObjectAllocEventMark jem(thread, h());
2850 JvmtiJavaThreadEventTransition jet(thread);
2851 jvmtiEventVMObjectAlloc callback = env->callbacks()->VMObjectAlloc;
2852 if (callback != NULL) {
2853 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2854 jem.jni_jobject(), jem.jni_class(), jem.size());
2855 }
2856 }
2857 }
2858 }
2859
2860 void JvmtiExport::post_sampled_object_alloc(JavaThread *thread, oop object) {
2861 JvmtiThreadState *state = thread->jvmti_thread_state();
2862 if (state == NULL) {
2863 return;
2864 }
2865 if (object == NULL) {
2866 return;
2867 }
2868 if (thread->is_in_any_VTMS_transition()) {
2869 return; // no events should be posted if thread is in any VTMS transition
2870 }
2871 HandleMark hm(thread);
2872 Handle h(thread, object);
2873
2874 EVT_TRIG_TRACE(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC,
2875 ("[%s] Trg sampled object alloc triggered",
2876 JvmtiTrace::safe_get_thread_name(thread)));
2877 JvmtiEnvThreadStateIterator it(state);
2878 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2879 if (ets->is_enabled(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC)) {
2880 EVT_TRACE(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC,
2881 ("[%s] Evt sampled object alloc sent %s",
2882 JvmtiTrace::safe_get_thread_name(thread),
2883 object == NULL ? "NULL" : object->klass()->external_name()));
2884
2885 JvmtiEnv *env = ets->get_env();
2886 JvmtiObjectAllocEventMark jem(thread, h());
2887 JvmtiJavaThreadEventTransition jet(thread);
2888 jvmtiEventSampledObjectAlloc callback = env->callbacks()->SampledObjectAlloc;
2889 if (callback != NULL) {
2890 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2891 jem.jni_jobject(), jem.jni_class(), jem.size());
2892 }
2893 }
2894 }
2895 }
2896
2897 ////////////////////////////////////////////////////////////////////////////////////////////////
2898
2899 void JvmtiExport::cleanup_thread(JavaThread* thread) {
2900 assert(JavaThread::current() == thread, "thread is not current");
2901 MutexLocker mu(thread, JvmtiThreadState_lock);
2902
2903 if (thread->jvmti_thread_state() != NULL) {
2904 // This has to happen after the thread state is removed, which is
2905 // why it is not in post_thread_end_event like its complement
2906 // Maybe both these functions should be rolled into the posts?
2907 JvmtiEventController::thread_ended(thread);
2908 }
2909 }
2910
2911 void JvmtiExport::clear_detected_exception(JavaThread* thread) {
2912 assert(JavaThread::current() == thread, "thread is not current");
2913
2914 JvmtiThreadState* state = thread->jvmti_thread_state();
2915 if (state != NULL) {
2916 state->clear_exception_state();
2917 }
2918 }
2919
2920 // Onload raw monitor transition.
2921 void JvmtiExport::transition_pending_onload_raw_monitors() {
2922 JvmtiPendingMonitors::transition_raw_monitors();
2923 }
2924
2925 ////////////////////////////////////////////////////////////////////////////////////////////////
2926 #if INCLUDE_SERVICES
2927 // Attach is disabled if SERVICES is not included
2928
2929 // type for the Agent_OnAttach entry point
2930 extern "C" {
2931 typedef jint (JNICALL *OnAttachEntry_t)(JavaVM*, char *, void *);
2932 }
2933
2934 jint JvmtiExport::load_agent_library(const char *agent, const char *absParam,
2935 const char *options, outputStream* st) {
2936 char ebuf[1024] = {0};
2937 char buffer[JVM_MAXPATHLEN];
2938 void* library = NULL;
2939 jint result = JNI_ERR;
2940 const char *on_attach_symbols[] = AGENT_ONATTACH_SYMBOLS;
2941 size_t num_symbol_entries = ARRAY_SIZE(on_attach_symbols);
2942
2943 // The abs parameter should be "true" or "false"
2944 bool is_absolute_path = (absParam != NULL) && (strcmp(absParam,"true")==0);
2945
2946 // Initially marked as invalid. It will be set to valid if we can find the agent
2947 AgentLibrary *agent_lib = new AgentLibrary(agent, options, is_absolute_path, NULL);
2948
2949 // Check for statically linked in agent. If not found then if the path is
2950 // absolute we attempt to load the library. Otherwise we try to load it
2951 // from the standard dll directory.
2952
2953 if (!os::find_builtin_agent(agent_lib, on_attach_symbols, num_symbol_entries)) {
2954 if (is_absolute_path) {
2955 library = os::dll_load(agent, ebuf, sizeof ebuf);
2956 } else {
2957 // Try to load the agent from the standard dll directory
2958 if (os::dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(),
2959 agent)) {
2960 library = os::dll_load(buffer, ebuf, sizeof ebuf);
2961 }
2962 if (library == NULL) {
2963 // not found - try OS default library path
2964 if (os::dll_build_name(buffer, sizeof(buffer), agent)) {
2965 library = os::dll_load(buffer, ebuf, sizeof ebuf);
2966 }
2967 }
2968 }
2969 if (library != NULL) {
2970 agent_lib->set_os_lib(library);
2971 agent_lib->set_valid();
2972 }
2973 }
2974 // If the library was loaded then we attempt to invoke the Agent_OnAttach
2975 // function
2976 if (agent_lib->valid()) {
2977 // Lookup the Agent_OnAttach function
2978 OnAttachEntry_t on_attach_entry = NULL;
2979 on_attach_entry = CAST_TO_FN_PTR(OnAttachEntry_t,
2980 os::find_agent_function(agent_lib, false, on_attach_symbols, num_symbol_entries));
2981 if (on_attach_entry == NULL) {
2982 // Agent_OnAttach missing - unload library
2983 if (!agent_lib->is_static_lib()) {
2984 os::dll_unload(library);
2985 }
2986 st->print_cr("%s is not available in %s",
2987 on_attach_symbols[0], agent_lib->name());
2988 delete agent_lib;
2989 } else {
2990 // Invoke the Agent_OnAttach function
2991 JavaThread* THREAD = JavaThread::current(); // For exception macros.
2992 {
2993 extern struct JavaVM_ main_vm;
2994 JvmtiThreadEventMark jem(THREAD);
2995 JvmtiJavaThreadEventTransition jet(THREAD);
2996
2997 result = (*on_attach_entry)(&main_vm, (char*)options, NULL);
2998
2999 // Agent_OnAttach may have used JNI
3000 if (THREAD->is_pending_jni_exception_check()) {
3001 THREAD->clear_pending_jni_exception_check();
3002 }
3003 }
3004
3005 // Agent_OnAttach may have used JNI
3006 if (HAS_PENDING_EXCEPTION) {
3007 CLEAR_PENDING_EXCEPTION;
3008 }
3009
3010 // If OnAttach returns JNI_OK then we add it to the list of
3011 // agent libraries so that we can call Agent_OnUnload later.
3012 if (result == JNI_OK) {
3013 Arguments::add_loaded_agent(agent_lib);
3014 } else {
3015 if (!agent_lib->is_static_lib()) {
3016 os::dll_unload(library);
3017 }
3018 delete agent_lib;
3019 }
3020
3021 // Agent_OnAttach executed so completion status is JNI_OK
3022 st->print_cr("return code: %d", result);
3023 result = JNI_OK;
3024 }
3025 } else {
3026 st->print_cr("%s was not loaded.", agent);
3027 if (*ebuf != '\0') {
3028 st->print_cr("%s", ebuf);
3029 }
3030 }
3031 return result;
3032 }
3033
3034 #endif // INCLUDE_SERVICES
3035 ////////////////////////////////////////////////////////////////////////////////////////////////
3036
3037 // Setup current current thread for event collection.
3038 void JvmtiEventCollector::setup_jvmti_thread_state() {
3039 // set this event collector to be the current one.
3040 JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current());
3041 // state can only be NULL if the current thread is exiting which
3042 // should not happen since we're trying to configure for event collection
3043 guarantee(state != NULL, "exiting thread called setup_jvmti_thread_state");
3044 if (is_vm_object_alloc_event()) {
3045 JvmtiVMObjectAllocEventCollector *prev = state->get_vm_object_alloc_event_collector();
3046
3047 // If we have a previous collector and it is disabled, it means this allocation came from a
3048 // callback induced VM Object allocation, do not register this collector then.
3049 if (prev && !prev->is_enabled()) {
3050 return;
3051 }
3052 _prev = prev;
3053 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)this);
3054 } else if (is_dynamic_code_event()) {
3055 _prev = state->get_dynamic_code_event_collector();
3056 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)this);
3057 } else if (is_sampled_object_alloc_event()) {
3058 JvmtiSampledObjectAllocEventCollector *prev = state->get_sampled_object_alloc_event_collector();
3059
3060 if (prev) {
3061 // JvmtiSampledObjectAllocEventCollector wants only one active collector
3062 // enabled. This allows to have a collector detect a user code requiring
3063 // a sample in the callback.
3064 return;
3065 }
3066 state->set_sampled_object_alloc_event_collector((JvmtiSampledObjectAllocEventCollector*) this);
3067 }
3068
3069 _unset_jvmti_thread_state = true;
3070 }
3071
3072 // Unset current event collection in this thread and reset it with previous
3073 // collector.
3074 void JvmtiEventCollector::unset_jvmti_thread_state() {
3075 if (!_unset_jvmti_thread_state) {
3076 return;
3077 }
3078
3079 JvmtiThreadState* state = JavaThread::current()->jvmti_thread_state();
3080 if (state != NULL) {
3081 // restore the previous event collector (if any)
3082 if (is_vm_object_alloc_event()) {
3083 if (state->get_vm_object_alloc_event_collector() == this) {
3084 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)_prev);
3085 } else {
3086 // this thread's jvmti state was created during the scope of
3087 // the event collector.
3088 }
3089 } else if (is_dynamic_code_event()) {
3090 if (state->get_dynamic_code_event_collector() == this) {
3091 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)_prev);
3092 } else {
3093 // this thread's jvmti state was created during the scope of
3094 // the event collector.
3095 }
3096 } else if (is_sampled_object_alloc_event()) {
3097 if (state->get_sampled_object_alloc_event_collector() == this) {
3098 state->set_sampled_object_alloc_event_collector((JvmtiSampledObjectAllocEventCollector*)_prev);
3099 } else {
3100 // this thread's jvmti state was created during the scope of
3101 // the event collector.
3102 }
3103 }
3104 }
3105 }
3106
3107 // create the dynamic code event collector
3108 JvmtiDynamicCodeEventCollector::JvmtiDynamicCodeEventCollector() : _code_blobs(NULL) {
3109 if (JvmtiExport::should_post_dynamic_code_generated()) {
3110 setup_jvmti_thread_state();
3111 }
3112 }
3113
3114 // iterate over any code blob descriptors collected and post a
3115 // DYNAMIC_CODE_GENERATED event to the profiler.
3116 JvmtiDynamicCodeEventCollector::~JvmtiDynamicCodeEventCollector() {
3117 assert(!JavaThread::current()->owns_locks(), "all locks must be released to post deferred events");
3118 // iterate over any code blob descriptors that we collected
3119 if (_code_blobs != NULL) {
3120 for (int i=0; i<_code_blobs->length(); i++) {
3121 JvmtiCodeBlobDesc* blob = _code_blobs->at(i);
3122 JvmtiExport::post_dynamic_code_generated(blob->name(), blob->code_begin(), blob->code_end());
3123 FreeHeap(blob);
3124 }
3125 delete _code_blobs;
3126 }
3127 unset_jvmti_thread_state();
3128 }
3129
3130 // register a stub
3131 void JvmtiDynamicCodeEventCollector::register_stub(const char* name, address start, address end) {
3132 if (_code_blobs == NULL) {
3133 _code_blobs = new (mtServiceability) GrowableArray<JvmtiCodeBlobDesc*>(1, mtServiceability);
3134 }
3135 _code_blobs->append(new JvmtiCodeBlobDesc(name, start, end));
3136 }
3137
3138 // Setup current thread to record vm allocated objects.
3139 JvmtiObjectAllocEventCollector::JvmtiObjectAllocEventCollector() :
3140 _allocated(NULL), _enable(false), _post_callback(NULL) {
3141 }
3142
3143 // Post vm_object_alloc event for vm allocated objects visible to java
3144 // world.
3145 void JvmtiObjectAllocEventCollector::generate_call_for_allocated() {
3146 if (_allocated) {
3147 set_enabled(false);
3148 for (int i = 0; i < _allocated->length(); i++) {
3149 oop obj = _allocated->at(i).resolve();
3150 _post_callback(JavaThread::current(), obj);
3151 // Release OopHandle
3152 _allocated->at(i).release(JvmtiExport::jvmti_oop_storage());
3153
3154 }
3155 delete _allocated, _allocated = NULL;
3156 }
3157 }
3158
3159 void JvmtiObjectAllocEventCollector::record_allocation(oop obj) {
3160 assert(is_enabled(), "Object alloc event collector is not enabled");
3161 if (_allocated == NULL) {
3162 _allocated = new (mtServiceability) GrowableArray<OopHandle>(1, mtServiceability);
3163 }
3164 _allocated->push(OopHandle(JvmtiExport::jvmti_oop_storage(), obj));
3165 }
3166
3167 // Disable collection of VMObjectAlloc events
3168 NoJvmtiVMObjectAllocMark::NoJvmtiVMObjectAllocMark() : _collector(NULL) {
3169 // a no-op if VMObjectAlloc event is not enabled
3170 if (!JvmtiExport::should_post_vm_object_alloc()) {
3171 return;
3172 }
3173 Thread* thread = Thread::current_or_null();
3174 if (thread != NULL && thread->is_Java_thread()) {
3175 JavaThread* current_thread = JavaThread::cast(thread);
3176 JvmtiThreadState *state = current_thread->jvmti_thread_state();
3177 if (state != NULL) {
3178 JvmtiVMObjectAllocEventCollector *collector;
3179 collector = state->get_vm_object_alloc_event_collector();
3180 if (collector != NULL && collector->is_enabled()) {
3181 _collector = collector;
3182 _collector->set_enabled(false);
3183 }
3184 }
3185 }
3186 }
3187
3188 // Re-Enable collection of VMObjectAlloc events (if previously enabled)
3189 NoJvmtiVMObjectAllocMark::~NoJvmtiVMObjectAllocMark() {
3190 if (was_enabled()) {
3191 _collector->set_enabled(true);
3192 }
3193 };
3194
3195 // Setup current thread to record vm allocated objects.
3196 JvmtiVMObjectAllocEventCollector::JvmtiVMObjectAllocEventCollector() {
3197 if (JvmtiExport::should_post_vm_object_alloc()) {
3198 _enable = true;
3199 setup_jvmti_thread_state();
3200 _post_callback = JvmtiExport::post_vm_object_alloc;
3201 }
3202 }
3203
3204 JvmtiVMObjectAllocEventCollector::~JvmtiVMObjectAllocEventCollector() {
3205 if (_enable) {
3206 generate_call_for_allocated();
3207 }
3208 unset_jvmti_thread_state();
3209 }
3210
3211 bool JvmtiSampledObjectAllocEventCollector::object_alloc_is_safe_to_sample() {
3212 Thread* thread = Thread::current();
3213 // Really only sample allocations if this is a JavaThread and not the compiler
3214 // thread.
3215 if (!thread->is_Java_thread() || thread->is_Compiler_thread()) {
3216 return false;
3217 }
3218
3219 if (MultiArray_lock->owner() == thread) {
3220 return false;
3221 }
3222 return true;
3223 }
3224
3225 // Setup current thread to record sampled allocated objects.
3226 void JvmtiSampledObjectAllocEventCollector::start() {
3227 if (JvmtiExport::should_post_sampled_object_alloc()) {
3228 if (!object_alloc_is_safe_to_sample()) {
3229 return;
3230 }
3231
3232 _enable = true;
3233 setup_jvmti_thread_state();
3234 _post_callback = JvmtiExport::post_sampled_object_alloc;
3235 }
3236 }
3237
3238 JvmtiSampledObjectAllocEventCollector::~JvmtiSampledObjectAllocEventCollector() {
3239 if (!_enable) {
3240 return;
3241 }
3242
3243 generate_call_for_allocated();
3244 unset_jvmti_thread_state();
3245
3246 // Unset the sampling collector as present in assertion mode only.
3247 assert(Thread::current()->is_Java_thread(),
3248 "Should always be in a Java thread");
3249 }
3250
3251 JvmtiGCMarker::JvmtiGCMarker() {
3252 // if there aren't any JVMTI environments then nothing to do
3253 if (!JvmtiEnv::environments_might_exist()) {
3254 return;
3255 }
3256
3257 if (JvmtiExport::should_post_garbage_collection_start()) {
3258 JvmtiExport::post_garbage_collection_start();
3259 }
3260
3261 if (SafepointSynchronize::is_at_safepoint()) {
3262 // Do clean up tasks that need to be done at a safepoint
3263 JvmtiEnvBase::check_for_periodic_clean_up();
3264 }
3265 }
3266
3267 JvmtiGCMarker::~JvmtiGCMarker() {
3268 // if there aren't any JVMTI environments then nothing to do
3269 if (!JvmtiEnv::environments_might_exist()) {
3270 return;
3271 }
3272
3273 // JVMTI notify gc finish
3274 if (JvmtiExport::should_post_garbage_collection_finish()) {
3275 JvmtiExport::post_garbage_collection_finish();
3276 }
3277 }