1 /*
2 * Copyright (c) 2003, 2024, 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/jvmtiAgentList.hpp"
47 #include "prims/jvmtiCodeBlobEvents.hpp"
48 #include "prims/jvmtiEventController.hpp"
49 #include "prims/jvmtiEventController.inline.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "prims/jvmtiImpl.hpp"
52 #include "prims/jvmtiManageCapabilities.hpp"
53 #include "prims/jvmtiRawMonitor.hpp"
54 #include "prims/jvmtiRedefineClasses.hpp"
55 #include "prims/jvmtiTagMap.hpp"
56 #include "prims/jvmtiThreadState.inline.hpp"
57 #include "runtime/arguments.hpp"
58 #include "runtime/fieldDescriptor.inline.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/interfaceSupport.inline.hpp"
61 #include "runtime/javaCalls.hpp"
62 #include "runtime/javaThread.hpp"
63 #include "runtime/jniHandles.inline.hpp"
64 #include "runtime/keepStackGCProcessed.hpp"
65 #include "runtime/objectMonitor.hpp"
66 #include "runtime/objectMonitor.inline.hpp"
67 #include "runtime/os.hpp"
68 #include "runtime/osThread.hpp"
69 #include "runtime/safepointVerifiers.hpp"
70 #include "runtime/serviceThread.hpp"
71 #include "runtime/threads.hpp"
72 #include "runtime/threadSMR.hpp"
73 #include "runtime/vframe.inline.hpp"
74 #include "runtime/vm_version.hpp"
75 #include "utilities/macros.hpp"
76
77 #ifdef JVMTI_TRACE
78 #define EVT_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_SENT) != 0) { SafeResourceMark rm; log_trace(jvmti) out; }
79 #define EVT_TRIG_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_TRIGGER) != 0) { SafeResourceMark rm; log_trace(jvmti) out; }
80 #else
81 #define EVT_TRIG_TRACE(evt,out)
82 #define EVT_TRACE(evt,out)
83 #endif
84
85 ///////////////////////////////////////////////////////////////
86 //
87 // JvmtiEventTransition
88 //
89 // TO DO --
90 // more handle purging
91
92 // Use this for JavaThreads and state is _thread_in_vm.
93 class JvmtiJavaThreadEventTransition : StackObj {
94 private:
95 ResourceMark _rm;
96 ThreadToNativeFromVM _transition;
97 HandleMark _hm;
98
99 public:
100 JvmtiJavaThreadEventTransition(JavaThread *thread) :
101 _rm(),
102 _transition(thread),
103 _hm(thread) {};
104 };
105
106 // For JavaThreads which are not in _thread_in_vm state
107 // and other system threads use this.
108 class JvmtiThreadEventTransition : StackObj {
109 private:
110 ResourceMark _rm;
111 HandleMark _hm;
112 JavaThreadState _saved_state;
113 JavaThread *_jthread;
114
115 public:
116 JvmtiThreadEventTransition(Thread *thread) : _rm(), _hm(thread) {
117 if (thread->is_Java_thread()) {
118 _jthread = JavaThread::cast(thread);
119 _saved_state = _jthread->thread_state();
120 if (_saved_state == _thread_in_Java) {
121 ThreadStateTransition::transition_from_java(_jthread, _thread_in_native);
122 } else {
123 ThreadStateTransition::transition_from_vm(_jthread, _thread_in_native);
124 }
125 } else {
126 _jthread = nullptr;
127 }
128 }
129
130 ~JvmtiThreadEventTransition() {
131 if (_jthread != nullptr)
132 ThreadStateTransition::transition_from_native(_jthread, _saved_state);
133 }
134 };
135
136
137 ///////////////////////////////////////////////////////////////
138 //
139 // JvmtiEventMark
140 //
141
142 class JvmtiEventMark : public StackObj {
143 private:
144 JavaThread *_thread;
145 JNIEnv* _jni_env;
146 JvmtiThreadState::ExceptionState _saved_exception_state;
147
148 public:
149 JvmtiEventMark(JavaThread *thread) : _thread(thread),
150 _jni_env(thread->jni_environment()),
151 _saved_exception_state(JvmtiThreadState::ES_CLEARED) {
152 JvmtiThreadState *state = thread->jvmti_thread_state();
153 // we are before an event.
154 // Save current jvmti thread exception state.
155 if (state != nullptr) {
156 _saved_exception_state = state->get_exception_state();
157 }
158
159 thread->push_jni_handle_block();
160 assert(thread == JavaThread::current(), "thread must be current!");
161 thread->frame_anchor()->make_walkable();
162 };
163
164 ~JvmtiEventMark() {
165 _thread->pop_jni_handle_block();
166
167 JvmtiThreadState* state = _thread->jvmti_thread_state();
168 // we are continuing after an event.
169 if (state != nullptr) {
170 // Restore the jvmti thread exception state.
171 state->restore_exception_state(_saved_exception_state);
172 }
173 }
174
175 jobject to_jobject(oop obj) { return JNIHandles::make_local(_thread,obj); }
176
177 jclass to_jclass(Klass* klass) { return (klass == nullptr ? nullptr : (jclass)to_jobject(klass->java_mirror())); }
178
179 jmethodID to_jmethodID(const methodHandle& method) { return method->jmethod_id(); }
180
181 JNIEnv* jni_env() { return _jni_env; }
182 };
183
184 class JvmtiThreadEventMark : public JvmtiEventMark {
185 private:
186 jobject _jthread;
187
188 public:
189 JvmtiThreadEventMark(JavaThread *thread) :
190 JvmtiEventMark(thread) {
191 _jthread = to_jobject(thread->threadObj());
192 };
193 jthread jni_thread() { return (jthread)_jthread; }
194 };
195
196 class JvmtiVirtualThreadEventMark : public JvmtiEventMark {
197 private:
198 jobject _jthread;
199
200 public:
201 JvmtiVirtualThreadEventMark(JavaThread *thread) :
202 JvmtiEventMark(thread) {
203 assert(thread->vthread() != nullptr || thread->threadObj() == nullptr, "sanity check");
204 _jthread = to_jobject(thread->vthread());
205 };
206 jthread jni_thread() { return (jthread)_jthread; }
207 };
208
209 class JvmtiClassEventMark : public JvmtiVirtualThreadEventMark {
210 private:
211 jclass _jc;
212
213 public:
214 JvmtiClassEventMark(JavaThread *thread, Klass* klass) :
215 JvmtiVirtualThreadEventMark(thread) {
216 _jc = to_jclass(klass);
217 };
218 jclass jni_class() { return _jc; }
219 };
220
221 class JvmtiMethodEventMark : public JvmtiVirtualThreadEventMark {
222 private:
223 jmethodID _mid;
224
225 public:
226 JvmtiMethodEventMark(JavaThread *thread, const methodHandle& method) :
227 JvmtiVirtualThreadEventMark(thread),
228 _mid(to_jmethodID(method)) {};
229 jmethodID jni_methodID() { return _mid; }
230 };
231
232 class JvmtiLocationEventMark : public JvmtiMethodEventMark {
233 private:
234 jlocation _loc;
235
236 public:
237 JvmtiLocationEventMark(JavaThread *thread, const methodHandle& method, address location) :
238 JvmtiMethodEventMark(thread, method),
239 _loc(location - method->code_base()) {};
240 jlocation location() { return _loc; }
241 };
242
243 class JvmtiExceptionEventMark : public JvmtiLocationEventMark {
244 private:
245 jobject _exc;
246
247 public:
248 JvmtiExceptionEventMark(JavaThread *thread, const methodHandle& method, address location, Handle exception) :
249 JvmtiLocationEventMark(thread, method, location),
250 _exc(to_jobject(exception())) {};
251 jobject exception() { return _exc; }
252 };
253
254 class JvmtiClassFileLoadEventMark : public JvmtiThreadEventMark {
255 private:
256 const char *_class_name;
257 jobject _jloader;
258 jobject _protection_domain;
259 jclass _class_being_redefined;
260
261 public:
262 JvmtiClassFileLoadEventMark(JavaThread *thread, Symbol* name,
263 Handle class_loader, Handle prot_domain, Klass* class_being_redefined) : JvmtiThreadEventMark(thread) {
264 _class_name = name != nullptr? name->as_utf8() : nullptr;
265 _jloader = (jobject)to_jobject(class_loader());
266 _protection_domain = (jobject)to_jobject(prot_domain());
267 if (class_being_redefined == nullptr) {
268 _class_being_redefined = nullptr;
269 } else {
270 _class_being_redefined = (jclass)to_jclass(class_being_redefined);
271 }
272 };
273 const char *class_name() {
274 return _class_name;
275 }
276 jobject jloader() {
277 return _jloader;
278 }
279 jobject protection_domain() {
280 return _protection_domain;
281 }
282 jclass class_being_redefined() {
283 return _class_being_redefined;
284 }
285 };
286
287 //////////////////////////////////////////////////////////////////////////////
288
289 int JvmtiExport::_field_access_count = 0;
290 int JvmtiExport::_field_modification_count = 0;
291
292 bool JvmtiExport::_can_access_local_variables = false;
293 bool JvmtiExport::_can_hotswap_or_post_breakpoint = false;
294 bool JvmtiExport::_can_modify_any_class = false;
295 bool JvmtiExport::_can_walk_any_space = false;
296
297 uint64_t JvmtiExport::_redefinition_count = 0;
298 bool JvmtiExport::_all_dependencies_are_recorded = false;
299
300 //
301 // field access management
302 //
303
304 // interpreter generator needs the address of the counter
305 address JvmtiExport::get_field_access_count_addr() {
306 // We don't grab a lock because we don't want to
307 // serialize field access between all threads. This means that a
308 // thread on another processor can see the wrong count value and
309 // may either miss making a needed call into post_field_access()
310 // or will make an unneeded call into post_field_access(). We pay
311 // this price to avoid slowing down the VM when we aren't watching
312 // field accesses.
313 // Other access/mutation safe by virtue of being in VM state.
314 return (address)(&_field_access_count);
315 }
316
317 //
318 // field modification management
319 //
320
321 // interpreter generator needs the address of the counter
322 address JvmtiExport::get_field_modification_count_addr() {
323 // We don't grab a lock because we don't
324 // want to serialize field modification between all threads. This
325 // means that a thread on another processor can see the wrong
326 // count value and may either miss making a needed call into
327 // post_field_modification() or will make an unneeded call into
328 // post_field_modification(). We pay this price to avoid slowing
329 // down the VM when we aren't watching field modifications.
330 // Other access/mutation safe by virtue of being in VM state.
331 return (address)(&_field_modification_count);
332 }
333
334
335 ///////////////////////////////////////////////////////////////
336 // Functions needed by java.lang.instrument for starting up javaagent.
337 ///////////////////////////////////////////////////////////////
338
339 jint
340 JvmtiExport::get_jvmti_interface(JavaVM *jvm, void **penv, jint version) {
341 // The JVMTI_VERSION_INTERFACE_JVMTI part of the version number
342 // has already been validated in JNI GetEnv().
343 int major, minor, micro;
344
345 // micro version doesn't matter here (yet?)
346 decode_version_values(version, &major, &minor, µ);
347 switch (major) {
348 case 1:
349 switch (minor) {
350 case 0: // version 1.0.<micro> is recognized
351 case 1: // version 1.1.<micro> is recognized
352 case 2: // version 1.2.<micro> is recognized
353 break;
354
355 default:
356 return JNI_EVERSION; // unsupported minor version number
357 }
358 break;
359 case 9:
360 switch (minor) {
361 case 0: // version 9.0.<micro> is recognized
362 break;
363 default:
364 return JNI_EVERSION; // unsupported minor version number
365 }
366 break;
367 case 11:
368 switch (minor) {
369 case 0: // version 11.0.<micro> is recognized
370 break;
371 default:
372 return JNI_EVERSION; // unsupported minor version number
373 }
374 break;
375 default:
376 // Starting from 13 we do not care about minor version anymore
377 if (major < 13 || major > VM_Version::vm_major_version()) {
378 return JNI_EVERSION; // unsupported major version number
379 }
380 }
381
382 if (JvmtiEnv::get_phase() == JVMTI_PHASE_LIVE) {
383 JavaThread* current_thread = JavaThread::current();
384 // transition code: native to VM
385 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, current_thread));
386 ThreadInVMfromNative __tiv(current_thread);
387 VM_ENTRY_BASE(jvmtiEnv*, JvmtiExport::get_jvmti_interface, current_thread)
388 debug_only(VMNativeEntryWrapper __vew;)
389
390 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version);
391 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv*
392
393 if (Continuations::enabled()) {
394 // Virtual threads support for agents loaded into running VM.
395 // There is a performance impact when VTMS transitions are enabled.
396 if (!JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
397 JvmtiEnvBase::enable_virtual_threads_notify_jvmti();
398 }
399 }
400 return JNI_OK;
401
402 } else if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
403 // not live, no thread to transition
404 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version);
405 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv*
406
407 if (Continuations::enabled()) {
408 // Virtual threads support for agents loaded at startup.
409 // There is a performance impact when VTMS transitions are enabled.
410 JvmtiVTMSTransitionDisabler::set_VTMS_notify_jvmti_events(true);
411 }
412 return JNI_OK;
413
414 } else {
415 // Called at the wrong time
416 *penv = nullptr;
417 return JNI_EDETACHED;
418 }
419 }
420
421 JvmtiThreadState*
422 JvmtiExport::get_jvmti_thread_state(JavaThread *thread) {
423 assert(thread == JavaThread::current(), "must be current thread");
424 if (thread->is_vthread_mounted() && thread->jvmti_thread_state() == nullptr) {
425 JvmtiEventController::thread_started(thread);
426 }
427 return thread->jvmti_thread_state();
428 }
429
430 void
431 JvmtiExport::add_default_read_edges(Handle h_module, TRAPS) {
432 if (!Universe::is_module_initialized()) {
433 return; // extra safety
434 }
435 assert(!h_module.is_null(), "module should always be set");
436
437 // Invoke the transformedByAgent method
438 JavaValue result(T_VOID);
439 JavaCalls::call_static(&result,
440 vmClasses::module_Modules_klass(),
441 vmSymbols::transformedByAgent_name(),
442 vmSymbols::transformedByAgent_signature(),
443 h_module,
444 THREAD);
445
446 if (HAS_PENDING_EXCEPTION) {
447 LogTarget(Trace, jvmti) log;
448 LogStream log_stream(log);
449 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
450 log_stream.cr();
451 CLEAR_PENDING_EXCEPTION;
452 return;
453 }
454 }
455
456 jvmtiError
457 JvmtiExport::add_module_reads(Handle module, Handle to_module, TRAPS) {
458 if (!Universe::is_module_initialized()) {
459 return JVMTI_ERROR_NONE; // extra safety
460 }
461 assert(!module.is_null(), "module should always be set");
462 assert(!to_module.is_null(), "to_module should always be set");
463
464 // Invoke the addReads method
465 JavaValue result(T_VOID);
466 JavaCalls::call_static(&result,
467 vmClasses::module_Modules_klass(),
468 vmSymbols::addReads_name(),
469 vmSymbols::addReads_signature(),
470 module,
471 to_module,
472 THREAD);
473
474 if (HAS_PENDING_EXCEPTION) {
475 LogTarget(Trace, jvmti) log;
476 LogStream log_stream(log);
477 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
478 log_stream.cr();
479 CLEAR_PENDING_EXCEPTION;
480 return JVMTI_ERROR_INTERNAL;
481 }
482 return JVMTI_ERROR_NONE;
483 }
484
485 jvmtiError
486 JvmtiExport::add_module_exports(Handle module, Handle pkg_name, Handle to_module, TRAPS) {
487 if (!Universe::is_module_initialized()) {
488 return JVMTI_ERROR_NONE; // extra safety
489 }
490 assert(!module.is_null(), "module should always be set");
491 assert(!to_module.is_null(), "to_module should always be set");
492 assert(!pkg_name.is_null(), "pkg_name should always be set");
493
494 // Invoke the addExports method
495 JavaValue result(T_VOID);
496 JavaCalls::call_static(&result,
497 vmClasses::module_Modules_klass(),
498 vmSymbols::addExports_name(),
499 vmSymbols::addExports_signature(),
500 module,
501 pkg_name,
502 to_module,
503 THREAD);
504
505 if (HAS_PENDING_EXCEPTION) {
506 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
507 LogTarget(Trace, jvmti) log;
508 LogStream log_stream(log);
509 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
510 log_stream.cr();
511 CLEAR_PENDING_EXCEPTION;
512 if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) {
513 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
514 }
515 return JVMTI_ERROR_INTERNAL;
516 }
517 return JVMTI_ERROR_NONE;
518 }
519
520 jvmtiError
521 JvmtiExport::add_module_opens(Handle module, Handle pkg_name, Handle to_module, TRAPS) {
522 if (!Universe::is_module_initialized()) {
523 return JVMTI_ERROR_NONE; // extra safety
524 }
525 assert(!module.is_null(), "module should always be set");
526 assert(!to_module.is_null(), "to_module should always be set");
527 assert(!pkg_name.is_null(), "pkg_name should always be set");
528
529 // Invoke the addOpens method
530 JavaValue result(T_VOID);
531 JavaCalls::call_static(&result,
532 vmClasses::module_Modules_klass(),
533 vmSymbols::addOpens_name(),
534 vmSymbols::addExports_signature(),
535 module,
536 pkg_name,
537 to_module,
538 THREAD);
539
540 if (HAS_PENDING_EXCEPTION) {
541 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
542 LogTarget(Trace, jvmti) log;
543 LogStream log_stream(log);
544 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
545 log_stream.cr();
546 CLEAR_PENDING_EXCEPTION;
547 if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) {
548 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
549 }
550 return JVMTI_ERROR_INTERNAL;
551 }
552 return JVMTI_ERROR_NONE;
553 }
554
555 jvmtiError
556 JvmtiExport::add_module_uses(Handle module, Handle service, TRAPS) {
557 if (!Universe::is_module_initialized()) {
558 return JVMTI_ERROR_NONE; // extra safety
559 }
560 assert(!module.is_null(), "module should always be set");
561 assert(!service.is_null(), "service should always be set");
562
563 // Invoke the addUses method
564 JavaValue result(T_VOID);
565 JavaCalls::call_static(&result,
566 vmClasses::module_Modules_klass(),
567 vmSymbols::addUses_name(),
568 vmSymbols::addUses_signature(),
569 module,
570 service,
571 THREAD);
572
573 if (HAS_PENDING_EXCEPTION) {
574 LogTarget(Trace, jvmti) log;
575 LogStream log_stream(log);
576 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
577 log_stream.cr();
578 CLEAR_PENDING_EXCEPTION;
579 return JVMTI_ERROR_INTERNAL;
580 }
581 return JVMTI_ERROR_NONE;
582 }
583
584 jvmtiError
585 JvmtiExport::add_module_provides(Handle module, Handle service, Handle impl_class, TRAPS) {
586 if (!Universe::is_module_initialized()) {
587 return JVMTI_ERROR_NONE; // extra safety
588 }
589 assert(!module.is_null(), "module should always be set");
590 assert(!service.is_null(), "service should always be set");
591 assert(!impl_class.is_null(), "impl_class should always be set");
592
593 // Invoke the addProvides method
594 JavaValue result(T_VOID);
595 JavaCalls::call_static(&result,
596 vmClasses::module_Modules_klass(),
597 vmSymbols::addProvides_name(),
598 vmSymbols::addProvides_signature(),
599 module,
600 service,
601 impl_class,
602 THREAD);
603
604 if (HAS_PENDING_EXCEPTION) {
605 LogTarget(Trace, jvmti) log;
606 LogStream log_stream(log);
607 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
608 log_stream.cr();
609 CLEAR_PENDING_EXCEPTION;
610 return JVMTI_ERROR_INTERNAL;
611 }
612 return JVMTI_ERROR_NONE;
613 }
614
615 void
616 JvmtiExport::decode_version_values(jint version, int * major, int * minor,
617 int * micro) {
618 *major = (version & JVMTI_VERSION_MASK_MAJOR) >> JVMTI_VERSION_SHIFT_MAJOR;
619 *minor = (version & JVMTI_VERSION_MASK_MINOR) >> JVMTI_VERSION_SHIFT_MINOR;
620 *micro = (version & JVMTI_VERSION_MASK_MICRO) >> JVMTI_VERSION_SHIFT_MICRO;
621 }
622
623 void JvmtiExport::enter_primordial_phase() {
624 JvmtiEnvBase::set_phase(JVMTI_PHASE_PRIMORDIAL);
625 }
626
627 void JvmtiExport::enter_early_start_phase() {
628 set_early_vmstart_recorded(true);
629 }
630
631 void JvmtiExport::enter_start_phase() {
632 JvmtiEnvBase::set_phase(JVMTI_PHASE_START);
633 }
634
635 void JvmtiExport::enter_onload_phase() {
636 JvmtiEnvBase::set_phase(JVMTI_PHASE_ONLOAD);
637 }
638
639 void JvmtiExport::enter_live_phase() {
640 JvmtiEnvBase::set_phase(JVMTI_PHASE_LIVE);
641 }
642
643 //
644 // JVMTI events that the VM posts to the debugger and also startup agent
645 // and call the agent's premain() for java.lang.instrument.
646 //
647
648 void JvmtiExport::post_early_vm_start() {
649 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg Early VM start event triggered" ));
650
651 // can now enable some events
652 JvmtiEventController::vm_start();
653
654 JvmtiEnvIterator it;
655 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
656 // Only early vmstart envs post early VMStart event
657 if (env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) {
658 EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt Early VM start event sent" ));
659 JavaThread *thread = JavaThread::current();
660 JvmtiThreadEventMark jem(thread);
661 JvmtiJavaThreadEventTransition jet(thread);
662 jvmtiEventVMStart callback = env->callbacks()->VMStart;
663 if (callback != nullptr) {
664 (*callback)(env->jvmti_external(), jem.jni_env());
665 }
666 }
667 }
668 }
669
670 void JvmtiExport::post_vm_start() {
671 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg VM start event triggered" ));
672
673 // can now enable some events
674 JvmtiEventController::vm_start();
675
676 JvmtiEnvIterator it;
677 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
678 // Early vmstart envs do not post normal VMStart event
679 if (!env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) {
680 EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt VM start event sent" ));
681
682 JavaThread *thread = JavaThread::current();
683 JvmtiThreadEventMark jem(thread);
684 JvmtiJavaThreadEventTransition jet(thread);
685 jvmtiEventVMStart callback = env->callbacks()->VMStart;
686 if (callback != nullptr) {
687 (*callback)(env->jvmti_external(), jem.jni_env());
688 }
689 }
690 }
691 }
692
693 static OopStorage* _jvmti_oop_storage = nullptr;
694 static OopStorage* _weak_tag_storage = nullptr;
695
696 OopStorage* JvmtiExport::jvmti_oop_storage() {
697 assert(_jvmti_oop_storage != nullptr, "not yet initialized");
698 return _jvmti_oop_storage;
699 }
700
701 OopStorage* JvmtiExport::weak_tag_storage() {
702 assert(_weak_tag_storage != nullptr, "not yet initialized");
703 return _weak_tag_storage;
704 }
705
706 void JvmtiExport::initialize_oop_storage() {
707 // OopStorage needs to be created early in startup and unconditionally
708 // because of OopStorageSet static array indices.
709 _jvmti_oop_storage = OopStorageSet::create_strong("JVMTI OopStorage", mtServiceability);
710 _weak_tag_storage = OopStorageSet::create_weak("JVMTI Tag Weak OopStorage", mtServiceability);
711 _weak_tag_storage->register_num_dead_callback(&JvmtiTagMap::gc_notification);
712 }
713
714 // Lookup an agent from an JvmtiEnv. Return agent only if it is not yet initialized.
715 // An agent can create multiple JvmtiEnvs, but for agent initialization, we are only interested in the initial one.
716 static JvmtiAgent* lookup_uninitialized_agent(JvmtiEnv* env, void* callback) {
717 JvmtiAgent* const agent = JvmtiAgentList::lookup(env, callback);
718 return agent == nullptr || agent->is_initialized() ? nullptr : agent;
719 }
720
721 void JvmtiExport::post_vm_initialized() {
722 EVT_TRIG_TRACE(JVMTI_EVENT_VM_INIT, ("Trg VM init event triggered" ));
723
724 // can now enable events
725 JvmtiEventController::vm_init();
726
727 JvmtiEnvIterator it;
728 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
729 if (env->is_enabled(JVMTI_EVENT_VM_INIT)) {
730 EVT_TRACE(JVMTI_EVENT_VM_INIT, ("Evt VM init event sent" ));
731
732 JavaThread *thread = JavaThread::current();
733 JvmtiThreadEventMark jem(thread);
734 JvmtiJavaThreadEventTransition jet(thread);
735 jvmtiEventVMInit callback = env->callbacks()->VMInit;
736 if (callback != nullptr) {
737 // We map the JvmtiEnv to its Agent to measure when and for how long
738 // it took to initialize so that JFR can report this information.
739 JvmtiAgent* const agent = lookup_uninitialized_agent(env, reinterpret_cast<void*>(callback));
740 if (agent != nullptr) {
741 agent->initialization_begin();
742 }
743 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
744 if (agent != nullptr) {
745 agent->initialization_end();
746 }
747 }
748 }
749 }
750
751 // Agents are initialized as part of posting the VMInit event above.
752 // For -Xrun agents and agents with no VMInit callback, we explicitly ensure they are also initialized.
753 // JVM_OnLoad and Agent_OnLoad callouts are performed too early for the proper timestamp logic.
754 JvmtiAgentList::initialize();
755 }
756
757 void JvmtiExport::post_vm_death() {
758 EVT_TRIG_TRACE(JVMTI_EVENT_VM_DEATH, ("Trg VM death event triggered" ));
759
760 JvmtiTagMap::flush_all_object_free_events();
761
762 JvmtiEnvIterator it;
763 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
764 if (env->is_enabled(JVMTI_EVENT_VM_DEATH)) {
765 EVT_TRACE(JVMTI_EVENT_VM_DEATH, ("Evt VM death event sent" ));
766
767 JavaThread *thread = JavaThread::current();
768 JvmtiEventMark jem(thread);
769 JvmtiJavaThreadEventTransition jet(thread);
770 jvmtiEventVMDeath callback = env->callbacks()->VMDeath;
771 if (callback != nullptr) {
772 (*callback)(env->jvmti_external(), jem.jni_env());
773 }
774 }
775 }
776
777 JvmtiEnvBase::set_phase(JVMTI_PHASE_DEAD);
778 JvmtiEventController::vm_death();
779 }
780
781 char**
782 JvmtiExport::get_all_native_method_prefixes(int* count_ptr) {
783 // Have to grab JVMTI thread state lock to be sure environment doesn't
784 // go away while we iterate them. No locks during VM bring-up.
785 if (Threads::number_of_threads() == 0 || SafepointSynchronize::is_at_safepoint()) {
786 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
787 } else {
788 MutexLocker mu(JvmtiThreadState_lock);
789 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
790 }
791 }
792
793 // Convert an external thread reference to a JavaThread found on the
794 // specified ThreadsList. The ThreadsListHandle in the caller "protects"
795 // the returned JavaThread *.
796 //
797 // If thread_oop_p is not null, then the caller wants to use the oop
798 // after this call so the oop is returned. On success, *jt_pp is set
799 // to the converted JavaThread * and JVMTI_ERROR_NONE is returned.
800 // On error, returns various JVMTI_ERROR_* values.
801 //
802 jvmtiError
803 JvmtiExport::cv_external_thread_to_JavaThread(ThreadsList * t_list,
804 jthread thread,
805 JavaThread ** jt_pp,
806 oop * thread_oop_p) {
807 assert(t_list != nullptr, "must have a ThreadsList");
808 assert(jt_pp != nullptr, "must have a return JavaThread pointer");
809 // thread_oop_p is optional so no assert()
810
811 if (thread_oop_p != nullptr) {
812 *thread_oop_p = nullptr;
813 }
814
815 oop thread_oop = JNIHandles::resolve_external_guard(thread);
816 if (thread_oop == nullptr) {
817 // null jthread, GC'ed jthread or a bad JNI handle.
818 return JVMTI_ERROR_INVALID_THREAD;
819 }
820 // Looks like an oop at this point.
821
822 if (!thread_oop->is_a(vmClasses::Thread_klass())) {
823 // The oop is not a java.lang.Thread.
824 return JVMTI_ERROR_INVALID_THREAD;
825 }
826 // Looks like a java.lang.Thread oop at this point.
827
828 if (thread_oop_p != nullptr) {
829 // Return the oop to the caller; the caller may still want
830 // the oop even if this function returns an error.
831 *thread_oop_p = thread_oop;
832 }
833
834 JavaThread * java_thread = java_lang_Thread::thread(thread_oop);
835 if (java_thread == nullptr) {
836 if (java_lang_VirtualThread::is_instance(thread_oop)) {
837 return JVMTI_ERROR_INVALID_THREAD;
838 }
839 // The java.lang.Thread does not contain a JavaThread * so it has
840 // not yet run or it has died.
841 return JVMTI_ERROR_THREAD_NOT_ALIVE;
842 }
843 // Looks like a live JavaThread at this point.
844
845 if (!t_list->includes(java_thread)) {
846 // Not on the JavaThreads list so it is not alive.
847 return JVMTI_ERROR_THREAD_NOT_ALIVE;
848 }
849
850 // Return a live JavaThread that is "protected" by the
851 // ThreadsListHandle in the caller.
852 *jt_pp = java_thread;
853
854 return JVMTI_ERROR_NONE;
855 }
856
857 // Convert an oop to a JavaThread found on the specified ThreadsList.
858 // The ThreadsListHandle in the caller "protects" the returned
859 // JavaThread *.
860 //
861 // On success, *jt_pp is set to the converted JavaThread * and
862 // JVMTI_ERROR_NONE is returned. On error, returns various
863 // JVMTI_ERROR_* values.
864 //
865 jvmtiError
866 JvmtiExport::cv_oop_to_JavaThread(ThreadsList * t_list, oop thread_oop,
867 JavaThread ** jt_pp) {
868 assert(t_list != nullptr, "must have a ThreadsList");
869 assert(thread_oop != nullptr, "must have an oop");
870 assert(jt_pp != nullptr, "must have a return JavaThread pointer");
871
872 if (!thread_oop->is_a(vmClasses::Thread_klass())) {
873 // The oop is not a java.lang.Thread.
874 return JVMTI_ERROR_INVALID_THREAD;
875 }
876 // Looks like a java.lang.Thread oop at this point.
877
878 JavaThread * java_thread = java_lang_Thread::thread(thread_oop);
879 if (java_thread == nullptr) {
880 // The java.lang.Thread does not contain a JavaThread * so it has
881 // not yet run or it has died.
882 return JVMTI_ERROR_THREAD_NOT_ALIVE;
883 }
884 // Looks like a live JavaThread at this point.
885
886 if (!t_list->includes(java_thread)) {
887 // Not on the JavaThreads list so it is not alive.
888 return JVMTI_ERROR_THREAD_NOT_ALIVE;
889 }
890
891 // Return a live JavaThread that is "protected" by the
892 // ThreadsListHandle in the caller.
893 *jt_pp = java_thread;
894
895 return JVMTI_ERROR_NONE;
896 }
897
898 class JvmtiClassFileLoadHookPoster : public StackObj {
899 private:
900 Symbol* _h_name;
901 Handle _class_loader;
902 Handle _h_protection_domain;
903 unsigned char ** _data_ptr;
904 unsigned char ** _end_ptr;
905 JavaThread * _thread;
906 jint _curr_len;
907 unsigned char * _curr_data;
908 JvmtiEnv * _curr_env;
909 JvmtiCachedClassFileData ** _cached_class_file_ptr;
910 JvmtiThreadState * _state;
911 Klass* _class_being_redefined;
912 JvmtiClassLoadKind _load_kind;
913 bool _has_been_modified;
914
915 public:
916 inline JvmtiClassFileLoadHookPoster(Symbol* h_name, Handle class_loader,
917 Handle h_protection_domain,
918 unsigned char **data_ptr, unsigned char **end_ptr,
919 JvmtiCachedClassFileData **cache_ptr) {
920 _h_name = h_name;
921 _class_loader = class_loader;
922 _h_protection_domain = h_protection_domain;
923 _data_ptr = data_ptr;
924 _end_ptr = end_ptr;
925 _thread = JavaThread::current();
926 _curr_len = pointer_delta_as_int(*end_ptr, *data_ptr);
927 _curr_data = *data_ptr;
928 _curr_env = nullptr;
929 _cached_class_file_ptr = cache_ptr;
930 _has_been_modified = false;
931
932 assert(!_thread->is_in_any_VTMS_transition(), "CFLH events are not allowed in any VTMS transition");
933 _state = JvmtiExport::get_jvmti_thread_state(_thread);
934 if (_state != nullptr) {
935 _class_being_redefined = _state->get_class_being_redefined();
936 _load_kind = _state->get_class_load_kind();
937 Klass* klass = (_class_being_redefined == nullptr) ? nullptr : _class_being_redefined;
938 if (_load_kind != jvmti_class_load_kind_load && klass != nullptr) {
939 ModuleEntry* module_entry = InstanceKlass::cast(klass)->module();
940 assert(module_entry != nullptr, "module_entry should always be set");
941 if (module_entry->is_named() &&
942 module_entry->module() != nullptr &&
943 !module_entry->has_default_read_edges()) {
944 if (!module_entry->set_has_default_read_edges()) {
945 // We won a potential race.
946 // Add read edges to the unnamed modules of the bootstrap and app class loaders
947 Handle class_module(_thread, module_entry->module()); // Obtain j.l.r.Module
948 JvmtiExport::add_default_read_edges(class_module, _thread);
949 }
950 }
951 }
952 // Clear class_being_redefined flag here. The action
953 // from agent handler could generate a new class file load
954 // hook event and if it is not cleared the new event generated
955 // from regular class file load could have this stale redefined
956 // class handle info.
957 _state->clear_class_being_redefined();
958 } else {
959 // redefine and retransform will always set the thread state
960 _class_being_redefined = nullptr;
961 _load_kind = jvmti_class_load_kind_load;
962 }
963 }
964
965 void post() {
966 post_all_envs();
967 copy_modified_data();
968 }
969
970 bool has_been_modified() { return _has_been_modified; }
971
972 private:
973 void post_all_envs() {
974 if (_load_kind != jvmti_class_load_kind_retransform) {
975 // for class load and redefine,
976 // call the non-retransformable agents
977 JvmtiEnvIterator it;
978 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
979 if (!env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
980 // non-retransformable agents cannot retransform back,
981 // so no need to cache the original class file bytes
982 post_to_env(env, false);
983 }
984 }
985 }
986 JvmtiEnvIterator it;
987 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
988 // retransformable agents get all events
989 if (env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
990 // retransformable agents need to cache the original class file
991 // bytes if changes are made via the ClassFileLoadHook
992 post_to_env(env, true);
993 }
994 }
995 }
996
997 void post_to_env(JvmtiEnv* env, bool caching_needed) {
998 if (env->phase() == JVMTI_PHASE_PRIMORDIAL && !env->early_class_hook_env()) {
999 return;
1000 }
1001 unsigned char *new_data = nullptr;
1002 jint new_len = 0;
1003 JvmtiClassFileLoadEventMark jem(_thread, _h_name, _class_loader,
1004 _h_protection_domain,
1005 _class_being_redefined);
1006 JvmtiJavaThreadEventTransition jet(_thread);
1007 jvmtiEventClassFileLoadHook callback = env->callbacks()->ClassFileLoadHook;
1008 if (callback != nullptr) {
1009 (*callback)(env->jvmti_external(), jem.jni_env(),
1010 jem.class_being_redefined(),
1011 jem.jloader(), jem.class_name(),
1012 jem.protection_domain(),
1013 _curr_len, _curr_data,
1014 &new_len, &new_data);
1015 }
1016 if (new_data != nullptr) {
1017 // this agent has modified class data.
1018 _has_been_modified = true;
1019 if (caching_needed && *_cached_class_file_ptr == nullptr) {
1020 // data has been changed by the new retransformable agent
1021 // and it hasn't already been cached, cache it
1022 JvmtiCachedClassFileData *p;
1023 p = (JvmtiCachedClassFileData *)os::malloc(
1024 offset_of(JvmtiCachedClassFileData, data) + _curr_len, mtInternal);
1025 if (p == nullptr) {
1026 vm_exit_out_of_memory(offset_of(JvmtiCachedClassFileData, data) + _curr_len,
1027 OOM_MALLOC_ERROR,
1028 "unable to allocate cached copy of original class bytes");
1029 }
1030 p->length = _curr_len;
1031 memcpy(p->data, _curr_data, _curr_len);
1032 *_cached_class_file_ptr = p;
1033 }
1034
1035 if (_curr_data != *_data_ptr) {
1036 // curr_data is previous agent modified class data.
1037 // And this has been changed by the new agent so
1038 // we can delete it now.
1039 _curr_env->Deallocate(_curr_data);
1040 }
1041
1042 // Class file data has changed by the current agent.
1043 _curr_data = new_data;
1044 _curr_len = new_len;
1045 // Save the current agent env we need this to deallocate the
1046 // memory allocated by this agent.
1047 _curr_env = env;
1048 }
1049 }
1050
1051 void copy_modified_data() {
1052 // if one of the agent has modified class file data.
1053 // Copy modified class data to new resources array.
1054 if (_curr_data != *_data_ptr) {
1055 *_data_ptr = NEW_RESOURCE_ARRAY(u1, _curr_len);
1056 memcpy(*_data_ptr, _curr_data, _curr_len);
1057 *_end_ptr = *_data_ptr + _curr_len;
1058 _curr_env->Deallocate(_curr_data);
1059 }
1060 }
1061 };
1062
1063 bool JvmtiExport::is_early_phase() {
1064 return JvmtiEnvBase::get_phase() <= JVMTI_PHASE_PRIMORDIAL;
1065 }
1066
1067 bool JvmtiExport::has_early_class_hook_env() {
1068 JvmtiEnvIterator it;
1069 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1070 if (env->early_class_hook_env()) {
1071 return true;
1072 }
1073 }
1074 return false;
1075 }
1076
1077 bool JvmtiExport::_should_post_class_file_load_hook = false;
1078
1079 // This flag is read by C2 during VM internal objects allocation
1080 int JvmtiExport::_should_notify_object_alloc = 0;
1081
1082 // this entry is for class file load hook on class load, redefine and retransform
1083 bool JvmtiExport::post_class_file_load_hook(Symbol* h_name,
1084 Handle class_loader,
1085 Handle h_protection_domain,
1086 unsigned char **data_ptr,
1087 unsigned char **end_ptr,
1088 JvmtiCachedClassFileData **cache_ptr) {
1089 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1090 return false;
1091 }
1092 if (JavaThread::current()->is_in_tmp_VTMS_transition()) {
1093 return false; // skip CFLH events in tmp VTMS transition
1094 }
1095
1096 JvmtiClassFileLoadHookPoster poster(h_name, class_loader,
1097 h_protection_domain,
1098 data_ptr, end_ptr,
1099 cache_ptr);
1100 poster.post();
1101 return poster.has_been_modified();
1102 }
1103
1104 void JvmtiExport::report_unsupported(bool on) {
1105 // If any JVMTI service is turned on, we need to exit before native code
1106 // tries to access nonexistent services.
1107 if (on) {
1108 vm_exit_during_initialization("Java Kernel does not support JVMTI.");
1109 }
1110 }
1111
1112
1113 static inline Klass* oop_to_klass(oop obj) {
1114 Klass* k = obj->klass();
1115
1116 // if the object is a java.lang.Class then return the java mirror
1117 if (k == vmClasses::Class_klass()) {
1118 if (!java_lang_Class::is_primitive(obj)) {
1119 k = java_lang_Class::as_Klass(obj);
1120 assert(k != nullptr, "class for non-primitive mirror must exist");
1121 }
1122 }
1123 return k;
1124 }
1125
1126 class JvmtiObjectAllocEventMark : public JvmtiClassEventMark {
1127 private:
1128 jobject _jobj;
1129 jlong _size;
1130 public:
1131 JvmtiObjectAllocEventMark(JavaThread *thread, oop obj) : JvmtiClassEventMark(thread, oop_to_klass(obj)) {
1132 _jobj = (jobject)to_jobject(obj);
1133 _size = obj->size() * wordSize;
1134 };
1135 jobject jni_jobject() { return _jobj; }
1136 jlong size() { return _size; }
1137 };
1138
1139 class JvmtiCompiledMethodLoadEventMark : public JvmtiMethodEventMark {
1140 private:
1141 jint _code_size;
1142 const void *_code_data;
1143 jint _map_length;
1144 jvmtiAddrLocationMap *_map;
1145 const void *_compile_info;
1146 public:
1147 JvmtiCompiledMethodLoadEventMark(JavaThread *thread, nmethod *nm, void* compile_info_ptr = nullptr)
1148 : JvmtiMethodEventMark(thread,methodHandle(thread, nm->method())) {
1149 _code_data = nm->code_begin();
1150 _code_size = nm->code_size();
1151 _compile_info = compile_info_ptr; // Set void pointer of compiledMethodLoad Event. Default value is null.
1152 JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nm, &_map, &_map_length);
1153 }
1154 ~JvmtiCompiledMethodLoadEventMark() {
1155 FREE_C_HEAP_ARRAY(jvmtiAddrLocationMap, _map);
1156 }
1157
1158 jint code_size() { return _code_size; }
1159 const void *code_data() { return _code_data; }
1160 jint map_length() { return _map_length; }
1161 const jvmtiAddrLocationMap* map() { return _map; }
1162 const void *compile_info() { return _compile_info; }
1163 };
1164
1165
1166
1167 class JvmtiMonitorEventMark : public JvmtiVirtualThreadEventMark {
1168 private:
1169 jobject _jobj;
1170 public:
1171 JvmtiMonitorEventMark(JavaThread *thread, oop object)
1172 : JvmtiVirtualThreadEventMark(thread){
1173 _jobj = to_jobject(object);
1174 }
1175 jobject jni_object() { return _jobj; }
1176 };
1177
1178 ///////////////////////////////////////////////////////////////
1179 //
1180 // pending CompiledMethodUnload support
1181 //
1182
1183 void JvmtiExport::post_compiled_method_unload(
1184 jmethodID method, const void *code_begin) {
1185 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1186 return;
1187 }
1188 JavaThread* thread = JavaThread::current();
1189 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
1190 ("[%s] method compile unload event triggered",
1191 JvmtiTrace::safe_get_thread_name(thread)));
1192
1193 // post the event for each environment that has this event enabled.
1194 JvmtiEnvIterator it;
1195 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1196 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_UNLOAD)) {
1197 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1198 continue;
1199 }
1200 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
1201 ("[%s] class compile method unload event sent jmethodID " PTR_FORMAT,
1202 JvmtiTrace::safe_get_thread_name(thread), p2i(method)));
1203
1204 ResourceMark rm(thread);
1205
1206 JvmtiEventMark jem(thread);
1207 JvmtiJavaThreadEventTransition jet(thread);
1208 jvmtiEventCompiledMethodUnload callback = env->callbacks()->CompiledMethodUnload;
1209 if (callback != nullptr) {
1210 (*callback)(env->jvmti_external(), method, code_begin);
1211 }
1212 }
1213 }
1214 }
1215
1216 ///////////////////////////////////////////////////////////////
1217 //
1218 // JvmtiExport
1219 //
1220
1221 void JvmtiExport::post_raw_breakpoint(JavaThread *thread, Method* method, address location) {
1222 HandleMark hm(thread);
1223 methodHandle mh(thread, method);
1224
1225 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1226 if (state == nullptr) {
1227 return;
1228 }
1229 if (thread->is_in_any_VTMS_transition()) {
1230 return; // no events should be posted if thread is in any VTMS transition
1231 }
1232
1233 EVT_TRIG_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Trg Breakpoint triggered",
1234 JvmtiTrace::safe_get_thread_name(thread)));
1235 JvmtiEnvThreadStateIterator it(state);
1236 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1237 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_BREAKPOINT);
1238 if (!ets->breakpoint_posted() && ets->is_enabled(JVMTI_EVENT_BREAKPOINT)) {
1239 ThreadState old_os_state = thread->osthread()->get_state();
1240 thread->osthread()->set_state(BREAKPOINTED);
1241 EVT_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Evt Breakpoint sent %s.%s @ " INTX_FORMAT,
1242 JvmtiTrace::safe_get_thread_name(thread),
1243 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1244 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
1245 location - mh()->code_base() ));
1246
1247 JvmtiEnv *env = ets->get_env();
1248 JvmtiLocationEventMark jem(thread, mh, location);
1249 JvmtiJavaThreadEventTransition jet(thread);
1250 jvmtiEventBreakpoint callback = env->callbacks()->Breakpoint;
1251 if (callback != nullptr) {
1252 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1253 jem.jni_methodID(), jem.location());
1254 }
1255
1256 ets->set_breakpoint_posted();
1257 thread->osthread()->set_state(old_os_state);
1258 }
1259 }
1260 }
1261
1262 //////////////////////////////////////////////////////////////////////////////
1263
1264 bool JvmtiExport::_can_get_source_debug_extension = false;
1265 bool JvmtiExport::_can_maintain_original_method_order = false;
1266 bool JvmtiExport::_can_post_interpreter_events = false;
1267 bool JvmtiExport::_can_post_on_exceptions = false;
1268 bool JvmtiExport::_can_post_breakpoint = false;
1269 bool JvmtiExport::_can_post_field_access = false;
1270 bool JvmtiExport::_can_post_field_modification = false;
1271 bool JvmtiExport::_can_post_method_entry = false;
1272 bool JvmtiExport::_can_post_method_exit = false;
1273 bool JvmtiExport::_can_post_frame_pop = false;
1274 bool JvmtiExport::_can_pop_frame = false;
1275 bool JvmtiExport::_can_force_early_return = false;
1276 bool JvmtiExport::_can_support_virtual_threads = false;
1277 bool JvmtiExport::_can_get_owned_monitor_info = false;
1278
1279 bool JvmtiExport::_early_vmstart_recorded = false;
1280
1281 bool JvmtiExport::_should_post_single_step = false;
1282 bool JvmtiExport::_should_post_field_access = false;
1283 bool JvmtiExport::_should_post_field_modification = false;
1284 bool JvmtiExport::_should_post_class_load = false;
1285 bool JvmtiExport::_should_post_class_prepare = false;
1286 bool JvmtiExport::_should_post_class_unload = false;
1287 bool JvmtiExport::_should_post_thread_life = false;
1288 bool JvmtiExport::_should_clean_up_heap_objects = false;
1289 bool JvmtiExport::_should_post_native_method_bind = false;
1290 bool JvmtiExport::_should_post_dynamic_code_generated = false;
1291 bool JvmtiExport::_should_post_data_dump = false;
1292 bool JvmtiExport::_should_post_compiled_method_load = false;
1293 bool JvmtiExport::_should_post_compiled_method_unload = false;
1294 bool JvmtiExport::_should_post_monitor_contended_enter = false;
1295 bool JvmtiExport::_should_post_monitor_contended_entered = false;
1296 bool JvmtiExport::_should_post_monitor_wait = false;
1297 bool JvmtiExport::_should_post_monitor_waited = false;
1298 bool JvmtiExport::_should_post_garbage_collection_start = false;
1299 bool JvmtiExport::_should_post_garbage_collection_finish = false;
1300 bool JvmtiExport::_should_post_object_free = false;
1301 bool JvmtiExport::_should_post_resource_exhausted = false;
1302 bool JvmtiExport::_should_post_vm_object_alloc = false;
1303 bool JvmtiExport::_should_post_sampled_object_alloc = false;
1304 bool JvmtiExport::_should_post_on_exceptions = false;
1305 bool JvmtiExport::_should_post_vthread_start = false;
1306 bool JvmtiExport::_should_post_vthread_end = false;
1307 bool JvmtiExport::_should_post_vthread_mount = false;
1308 bool JvmtiExport::_should_post_vthread_unmount = false;
1309
1310 ////////////////////////////////////////////////////////////////////////////////////////////////
1311
1312
1313 //
1314 // JVMTI single step management
1315 //
1316 void JvmtiExport::at_single_stepping_point(JavaThread *thread, Method* method, address location) {
1317 assert(JvmtiExport::should_post_single_step(), "must be single stepping");
1318
1319 HandleMark hm(thread);
1320 methodHandle mh(thread, method);
1321
1322 // update information about current location and post a step event
1323 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1324 if (state == nullptr) {
1325 return;
1326 }
1327 EVT_TRIG_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Trg Single Step triggered",
1328 JvmtiTrace::safe_get_thread_name(thread)));
1329 if (!state->hide_single_stepping()) {
1330 if (state->is_pending_step_for_popframe()) {
1331 state->process_pending_step_for_popframe();
1332 }
1333 if (state->is_pending_step_for_earlyret()) {
1334 state->process_pending_step_for_earlyret();
1335 }
1336 JvmtiExport::post_single_step(thread, mh(), location);
1337 }
1338 }
1339
1340
1341 void JvmtiExport::expose_single_stepping(JavaThread *thread) {
1342 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1343 if (state != nullptr) {
1344 state->clear_hide_single_stepping();
1345 }
1346 }
1347
1348
1349 bool JvmtiExport::hide_single_stepping(JavaThread *thread) {
1350 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1351 if (state != nullptr && state->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1352 state->set_hide_single_stepping();
1353 return true;
1354 } else {
1355 return false;
1356 }
1357 }
1358
1359 void JvmtiExport::post_class_load(JavaThread *thread, Klass* klass) {
1360 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1361 return;
1362 }
1363 HandleMark hm(thread);
1364
1365 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1366 if (state == nullptr) {
1367 return;
1368 }
1369 if (thread->is_in_tmp_VTMS_transition()) {
1370 return; // skip ClassLoad events in tmp VTMS transition
1371 }
1372 assert(!thread->is_in_any_VTMS_transition(), "class load events are not allowed in any VTMS transition");
1373
1374 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Trg Class Load triggered",
1375 JvmtiTrace::safe_get_thread_name(thread)));
1376 JvmtiEnvThreadStateIterator it(state);
1377 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1378 if (ets->is_enabled(JVMTI_EVENT_CLASS_LOAD)) {
1379 JvmtiEnv *env = ets->get_env();
1380 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1381 continue;
1382 }
1383 EVT_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Evt Class Load sent %s",
1384 JvmtiTrace::safe_get_thread_name(thread),
1385 klass==nullptr? "null" : klass->external_name() ));
1386 JvmtiClassEventMark jem(thread, klass);
1387 JvmtiJavaThreadEventTransition jet(thread);
1388 jvmtiEventClassLoad callback = env->callbacks()->ClassLoad;
1389 if (callback != nullptr) {
1390 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1391 }
1392 }
1393 }
1394 }
1395
1396
1397 void JvmtiExport::post_class_prepare(JavaThread *thread, Klass* klass) {
1398 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1399 return;
1400 }
1401 HandleMark hm(thread);
1402
1403 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1404 if (state == nullptr) {
1405 return;
1406 }
1407 if (thread->is_in_tmp_VTMS_transition()) {
1408 return; // skip ClassPrepare events in tmp VTMS transition
1409 }
1410 assert(!thread->is_in_any_VTMS_transition(), "class prepare events are not allowed in any VTMS transition");
1411
1412 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Trg Class Prepare triggered",
1413 JvmtiTrace::safe_get_thread_name(thread)));
1414 JvmtiEnvThreadStateIterator it(state);
1415 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1416 if (ets->is_enabled(JVMTI_EVENT_CLASS_PREPARE)) {
1417 JvmtiEnv *env = ets->get_env();
1418 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1419 continue;
1420 }
1421 EVT_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Evt Class Prepare sent %s",
1422 JvmtiTrace::safe_get_thread_name(thread),
1423 klass==nullptr? "null" : klass->external_name() ));
1424 JvmtiClassEventMark jem(thread, klass);
1425 JvmtiJavaThreadEventTransition jet(thread);
1426 jvmtiEventClassPrepare callback = env->callbacks()->ClassPrepare;
1427 if (callback != nullptr) {
1428 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1429 }
1430 }
1431 }
1432 }
1433
1434 void JvmtiExport::post_class_unload(Klass* klass) {
1435 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1436 return;
1437 }
1438
1439 // postings to the service thread so that it can perform them in a safe
1440 // context and in-order.
1441 ResourceMark rm;
1442 // JvmtiDeferredEvent copies the string.
1443 JvmtiDeferredEvent event = JvmtiDeferredEvent::class_unload_event(klass->name()->as_C_string());
1444 ServiceThread::enqueue_deferred_event(&event);
1445 }
1446
1447
1448 void JvmtiExport::post_class_unload_internal(const char* name) {
1449 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1450 return;
1451 }
1452 assert(Thread::current()->is_service_thread(), "must be called from ServiceThread");
1453 JavaThread *thread = JavaThread::current();
1454 HandleMark hm(thread);
1455
1456 EVT_TRIG_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Trg Class Unload triggered" ));
1457 if (JvmtiEventController::is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1458
1459 JvmtiEnvIterator it;
1460 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1461 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1462 continue;
1463 }
1464 if (env->is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1465 EVT_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Evt Class Unload sent %s", name));
1466
1467 JvmtiEventMark jem(thread);
1468 JvmtiJavaThreadEventTransition jet(thread);
1469 jvmtiExtensionEvent callback = env->ext_callbacks()->ClassUnload;
1470 if (callback != nullptr) {
1471 (*callback)(env->jvmti_external(), jem.jni_env(), name);
1472 }
1473 }
1474 }
1475 }
1476 }
1477
1478
1479 void JvmtiExport::post_thread_start(JavaThread *thread) {
1480 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1481 return;
1482 }
1483 assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
1484
1485 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Trg Thread Start event triggered",
1486 JvmtiTrace::safe_get_thread_name(thread)));
1487
1488 // do JVMTI thread initialization (if needed)
1489 JvmtiEventController::thread_started(thread);
1490
1491 if (thread->threadObj()->is_a(vmClasses::BoundVirtualThread_klass())) {
1492 if (JvmtiExport::can_support_virtual_threads()) {
1493 // Check for VirtualThreadStart event instead.
1494 HandleMark hm(thread);
1495 Handle vthread(thread, thread->threadObj());
1496 JvmtiExport::post_vthread_start((jthread)vthread.raw_value());
1497 }
1498 return;
1499 }
1500
1501 // Do not post thread start event for hidden java thread.
1502 if (JvmtiEventController::is_enabled(JVMTI_EVENT_THREAD_START) &&
1503 !thread->is_hidden_from_external_view()) {
1504 JvmtiEnvIterator it;
1505 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1506 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1507 continue;
1508 }
1509 if (env->is_enabled(JVMTI_EVENT_THREAD_START)) {
1510 EVT_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Evt Thread Start event sent",
1511 JvmtiTrace::safe_get_thread_name(thread) ));
1512
1513 JvmtiVirtualThreadEventMark jem(thread);
1514 JvmtiJavaThreadEventTransition jet(thread);
1515 jvmtiEventThreadStart callback = env->callbacks()->ThreadStart;
1516 if (callback != nullptr) {
1517 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1518 }
1519 }
1520 }
1521 }
1522 }
1523
1524
1525 void JvmtiExport::post_thread_end(JavaThread *thread) {
1526 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1527 return;
1528 }
1529 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Trg Thread End event triggered",
1530 JvmtiTrace::safe_get_thread_name(thread)));
1531
1532 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1533 if (state == nullptr) {
1534 return;
1535 }
1536
1537 if (thread->threadObj()->is_a(vmClasses::BoundVirtualThread_klass())) {
1538 if (JvmtiExport::can_support_virtual_threads()) {
1539 // Check for VirtualThreadEnd event instead.
1540 HandleMark hm(thread);
1541 Handle vthread(thread, thread->threadObj());
1542 JvmtiExport::post_vthread_end((jthread)vthread.raw_value());
1543 }
1544 return;
1545 }
1546
1547 // Do not post thread end event for hidden java thread.
1548 if (state->is_enabled(JVMTI_EVENT_THREAD_END) &&
1549 !thread->is_hidden_from_external_view()) {
1550
1551 JvmtiEnvThreadStateIterator it(state);
1552 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1553 JvmtiEnv *env = ets->get_env();
1554 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1555 continue;
1556 }
1557 if (ets->is_enabled(JVMTI_EVENT_THREAD_END)) {
1558 EVT_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Evt Thread End event sent",
1559 JvmtiTrace::safe_get_thread_name(thread) ));
1560
1561 JvmtiVirtualThreadEventMark jem(thread);
1562 JvmtiJavaThreadEventTransition jet(thread);
1563 jvmtiEventThreadEnd callback = env->callbacks()->ThreadEnd;
1564 if (callback != nullptr) {
1565 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1566 }
1567 }
1568 }
1569 }
1570 }
1571
1572
1573 void JvmtiExport::post_vthread_start(jobject vthread) {
1574 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1575 return;
1576 }
1577 EVT_TRIG_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_START, ("[%p] Trg Virtual Thread Start event triggered", vthread));
1578
1579 JavaThread *thread = JavaThread::current();
1580 assert(!thread->is_hidden_from_external_view(), "carrier threads can't be hidden");
1581
1582 if (JvmtiEventController::is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_START)) {
1583 JvmtiEnvIterator it;
1584 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1585 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1586 continue;
1587 }
1588 if (env->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_START)) {
1589 EVT_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_START, ("[%p] Evt Virtual Thread Start event sent", vthread));
1590
1591 JvmtiVirtualThreadEventMark jem(thread);
1592 JvmtiJavaThreadEventTransition jet(thread);
1593 jvmtiEventVirtualThreadStart callback = env->callbacks()->VirtualThreadStart;
1594 if (callback != nullptr) {
1595 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1596 }
1597 }
1598 }
1599 }
1600 }
1601
1602 void JvmtiExport::post_vthread_end(jobject vthread) {
1603 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1604 return;
1605 }
1606 EVT_TRIG_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_END, ("[%p] Trg Virtual Thread End event triggered", vthread));
1607
1608 JavaThread *thread = JavaThread::current();
1609 assert(!thread->is_hidden_from_external_view(), "carrier threads can't be hidden");
1610
1611 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1612 if (state == nullptr) {
1613 return;
1614 }
1615
1616 if (state->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_END)) {
1617 JvmtiEnvThreadStateIterator it(state);
1618
1619 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1620 JvmtiEnv *env = ets->get_env();
1621 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1622 continue;
1623 }
1624 if (ets->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_END)) {
1625 EVT_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_END, ("[%p] Evt Virtual Thread End event sent", vthread));
1626
1627 JvmtiVirtualThreadEventMark jem(thread);
1628 JvmtiJavaThreadEventTransition jet(thread);
1629 jvmtiEventVirtualThreadEnd callback = env->callbacks()->VirtualThreadEnd;
1630 if (callback != nullptr) {
1631 (*callback)(env->jvmti_external(), jem.jni_env(), vthread);
1632 }
1633 }
1634 }
1635 }
1636 }
1637
1638 void JvmtiExport::post_vthread_mount(jobject vthread) {
1639 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1640 return;
1641 }
1642 JavaThread *thread = JavaThread::current();
1643 HandleMark hm(thread);
1644 EVT_TRIG_TRACE(EXT_EVENT_VIRTUAL_THREAD_MOUNT, ("[%p] Trg Virtual Thread Mount event triggered", vthread));
1645
1646 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1647 if (state == nullptr) {
1648 return;
1649 }
1650
1651 if (state->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_MOUNT)) {
1652 JvmtiEnvThreadStateIterator it(state);
1653
1654 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1655 JvmtiEnv *env = ets->get_env();
1656 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1657 continue;
1658 }
1659 if (ets->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_MOUNT)) {
1660 EVT_TRACE(EXT_EVENT_VIRTUAL_THREAD_MOUNT, ("[%p] Evt Virtual Thread Mount event sent", vthread));
1661
1662 JvmtiVirtualThreadEventMark jem(thread);
1663 JvmtiJavaThreadEventTransition jet(thread);
1664 jvmtiExtensionEvent callback = env->ext_callbacks()->VirtualThreadMount;
1665 if (callback != nullptr) {
1666 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1667 }
1668 }
1669 }
1670 }
1671 }
1672
1673 void JvmtiExport::post_vthread_unmount(jobject vthread) {
1674 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1675 return;
1676 }
1677 JavaThread *thread = JavaThread::current();
1678 HandleMark hm(thread);
1679 EVT_TRIG_TRACE(EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, ("[%p] Trg Virtual Thread Unmount event triggered", vthread));
1680
1681 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1682 if (state == nullptr) {
1683 return;
1684 }
1685
1686 if (state->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_UNMOUNT)) {
1687 JvmtiEnvThreadStateIterator it(state);
1688
1689 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1690 JvmtiEnv *env = ets->get_env();
1691 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1692 continue;
1693 }
1694 if (ets->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_UNMOUNT)) {
1695 EVT_TRACE(EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, ("[%p] Evt Virtual Thread Unmount event sent", vthread));
1696
1697 JvmtiVirtualThreadEventMark jem(thread);
1698 JvmtiJavaThreadEventTransition jet(thread);
1699 jvmtiExtensionEvent callback = env->ext_callbacks()->VirtualThreadUnmount;
1700 if (callback != nullptr) {
1701 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1702 }
1703 }
1704 }
1705 }
1706 }
1707
1708 void JvmtiExport::continuation_yield_cleanup(JavaThread* thread, jint continuation_frame_count) {
1709 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1710 return;
1711 }
1712
1713 assert(thread == JavaThread::current(), "must be");
1714 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1715 if (state == nullptr) {
1716 return;
1717 }
1718 state->invalidate_cur_stack_depth();
1719
1720 // Clear frame_pop requests in frames popped by yield
1721 if (can_post_frame_pop()) {
1722 JvmtiEnvThreadStateIterator it(state);
1723 int top_frame_num = state->cur_stack_depth() + continuation_frame_count;
1724
1725 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1726 if (!ets->has_frame_pops()) {
1727 continue;
1728 }
1729 for (int frame_idx = 0; frame_idx < continuation_frame_count; frame_idx++) {
1730 int frame_num = top_frame_num - frame_idx;
1731
1732 if (!state->is_virtual() && ets->is_frame_pop(frame_num)) {
1733 // remove the frame's entry
1734 MutexLocker mu(JvmtiThreadState_lock);
1735 ets->clear_frame_pop(frame_num);
1736 }
1737 }
1738 }
1739 }
1740 }
1741
1742 void JvmtiExport::post_object_free(JvmtiEnv* env, GrowableArray<jlong>* objects) {
1743 assert(objects != nullptr, "Nothing to post");
1744
1745 JavaThread *javaThread = JavaThread::current();
1746 if (javaThread->is_in_any_VTMS_transition()) {
1747 return; // no events should be posted if thread is in any VTMS transition
1748 }
1749 if (!env->is_enabled(JVMTI_EVENT_OBJECT_FREE)) {
1750 return; // the event type has been already disabled
1751 }
1752
1753 EVT_TRIG_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Trg Object Free triggered" ));
1754 EVT_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Evt Object Free sent"));
1755
1756 JvmtiThreadEventMark jem(javaThread);
1757 JvmtiJavaThreadEventTransition jet(javaThread);
1758 jvmtiEventObjectFree callback = env->callbacks()->ObjectFree;
1759 if (callback != nullptr) {
1760 for (int index = 0; index < objects->length(); index++) {
1761 (*callback)(env->jvmti_external(), objects->at(index));
1762 }
1763 }
1764 }
1765
1766 void JvmtiExport::post_resource_exhausted(jint resource_exhausted_flags, const char* description) {
1767
1768 JavaThread *thread = JavaThread::current();
1769
1770 if (thread->is_in_any_VTMS_transition()) {
1771 return; // no events should be posted if thread is in any VTMS transition
1772 }
1773
1774 log_error(jvmti)("Posting Resource Exhausted event: %s",
1775 description != nullptr ? description : "unknown");
1776
1777 // JDK-8213834: handlers of ResourceExhausted may attempt some analysis
1778 // which often requires running java.
1779 // This will cause problems on threads not able to run java, e.g. compiler
1780 // threads. To forestall these problems, we therefore suppress sending this
1781 // event from threads which are not able to run java.
1782 if (!thread->can_call_java()) {
1783 return;
1784 }
1785
1786 EVT_TRIG_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Trg resource exhausted event triggered" ));
1787
1788 JvmtiEnvIterator it;
1789 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1790 if (env->is_enabled(JVMTI_EVENT_RESOURCE_EXHAUSTED)) {
1791 EVT_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Evt resource exhausted event sent" ));
1792
1793 JvmtiThreadEventMark jem(thread);
1794 JvmtiJavaThreadEventTransition jet(thread);
1795 jvmtiEventResourceExhausted callback = env->callbacks()->ResourceExhausted;
1796 if (callback != nullptr) {
1797 (*callback)(env->jvmti_external(), jem.jni_env(),
1798 resource_exhausted_flags, nullptr, description);
1799 }
1800 }
1801 }
1802 }
1803
1804 void JvmtiExport::post_method_entry(JavaThread *thread, Method* method, frame current_frame) {
1805 HandleMark hm(thread);
1806 methodHandle mh(thread, method);
1807
1808 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1809 if (state == nullptr || !state->is_interp_only_mode()) {
1810 // for any thread that actually wants method entry, interp_only_mode is set
1811 return;
1812 }
1813 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1814 return; // no events should be posted if thread is in any VTMS transition
1815 }
1816 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Trg Method Entry triggered %s.%s",
1817 JvmtiTrace::safe_get_thread_name(thread),
1818 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1819 (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1820
1821 state->incr_cur_stack_depth();
1822
1823 if (state->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1824 JvmtiEnvThreadStateIterator it(state);
1825 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1826 if (ets->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1827 EVT_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Evt Method Entry sent %s.%s",
1828 JvmtiTrace::safe_get_thread_name(thread),
1829 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1830 (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1831
1832 JvmtiEnv *env = ets->get_env();
1833 JvmtiMethodEventMark jem(thread, mh);
1834 JvmtiJavaThreadEventTransition jet(thread);
1835 jvmtiEventMethodEntry callback = env->callbacks()->MethodEntry;
1836 if (callback != nullptr) {
1837 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_methodID());
1838 }
1839 }
1840 }
1841 }
1842 }
1843
1844 void JvmtiExport::post_method_exit(JavaThread* thread, Method* method, frame current_frame) {
1845 HandleMark hm(thread);
1846 methodHandle mh(thread, method);
1847
1848 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1849
1850 if (state == nullptr || !state->is_interp_only_mode()) {
1851 // for any thread that actually wants method exit, interp_only_mode is set
1852 return;
1853 }
1854
1855 // return a flag when a method terminates by throwing an exception
1856 // i.e. if an exception is thrown and it's not caught by the current method
1857 bool exception_exit = state->is_exception_detected() && !state->is_exception_caught();
1858 Handle result;
1859 jvalue value;
1860 value.j = 0L;
1861
1862 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1863 // if the method hasn't been popped because of an exception then we populate
1864 // the return_value parameter for the callback. At this point we only have
1865 // the address of a "raw result" and we just call into the interpreter to
1866 // convert this into a jvalue.
1867 if (!exception_exit) {
1868 oop oop_result;
1869 BasicType type = current_frame.interpreter_frame_result(&oop_result, &value);
1870 if (is_reference_type(type)) {
1871 result = Handle(thread, oop_result);
1872 value.l = JNIHandles::make_local(thread, result());
1873 }
1874 }
1875 }
1876
1877 // Deferred transition to VM, so we can stash away the return oop before GC
1878 // Note that this transition is not needed when throwing an exception, because
1879 // there is no oop to retain.
1880 JavaThread* current = thread; // for JRT_BLOCK
1881 JRT_BLOCK
1882 post_method_exit_inner(thread, mh, state, exception_exit, current_frame, value);
1883 JRT_BLOCK_END
1884
1885 if (result.not_null() && !mh->is_native()) {
1886 // We have to restore the oop on the stack for interpreter frames
1887 *(oop*)current_frame.interpreter_frame_tos_address() = result();
1888 }
1889 }
1890
1891 void JvmtiExport::post_method_exit_inner(JavaThread* thread,
1892 methodHandle& mh,
1893 JvmtiThreadState *state,
1894 bool exception_exit,
1895 frame current_frame,
1896 jvalue& value) {
1897 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1898 return; // no events should be posted if thread is in any VTMS transition
1899 }
1900
1901 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Trg Method Exit triggered %s.%s",
1902 JvmtiTrace::safe_get_thread_name(thread),
1903 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1904 (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1905
1906 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1907 JvmtiEnvThreadStateIterator it(state);
1908 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1909 if (ets->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1910 EVT_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Evt Method Exit sent %s.%s",
1911 JvmtiTrace::safe_get_thread_name(thread),
1912 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1913 (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1914
1915 JvmtiEnv *env = ets->get_env();
1916 JvmtiMethodEventMark jem(thread, mh);
1917 JvmtiJavaThreadEventTransition jet(thread);
1918 jvmtiEventMethodExit callback = env->callbacks()->MethodExit;
1919 if (callback != nullptr) {
1920 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1921 jem.jni_methodID(), exception_exit, value);
1922 }
1923 }
1924 }
1925 }
1926
1927 JvmtiEnvThreadStateIterator it(state);
1928 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1929 if (ets->has_frame_pops()) {
1930 int cur_frame_number = state->cur_stack_depth();
1931
1932 if (ets->is_frame_pop(cur_frame_number)) {
1933 // we have a NotifyFramePop entry for this frame.
1934 // now check that this env/thread wants this event
1935 if (ets->is_enabled(JVMTI_EVENT_FRAME_POP)) {
1936 EVT_TRACE(JVMTI_EVENT_FRAME_POP, ("[%s] Evt Frame Pop sent %s.%s",
1937 JvmtiTrace::safe_get_thread_name(thread),
1938 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1939 (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1940
1941 // we also need to issue a frame pop event for this frame
1942 JvmtiEnv *env = ets->get_env();
1943 JvmtiMethodEventMark jem(thread, mh);
1944 JvmtiJavaThreadEventTransition jet(thread);
1945 jvmtiEventFramePop callback = env->callbacks()->FramePop;
1946 if (callback != nullptr) {
1947 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1948 jem.jni_methodID(), exception_exit);
1949 }
1950 }
1951 // remove the frame's entry
1952 {
1953 MutexLocker mu(JvmtiThreadState_lock);
1954 ets->clear_frame_pop(cur_frame_number);
1955 }
1956 }
1957 }
1958 }
1959
1960 state->decr_cur_stack_depth();
1961 }
1962
1963
1964 // Todo: inline this for optimization
1965 void JvmtiExport::post_single_step(JavaThread *thread, Method* method, address location) {
1966 HandleMark hm(thread);
1967 methodHandle mh(thread, method);
1968
1969 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1970 if (state == nullptr) {
1971 return;
1972 }
1973 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1974 return; // no events should be posted if thread is in any VTMS transition
1975 }
1976
1977 JvmtiEnvThreadStateIterator it(state);
1978 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1979 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_SINGLE_STEP);
1980 if (!ets->single_stepping_posted() && ets->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1981 EVT_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Evt Single Step sent %s.%s @ " INTX_FORMAT,
1982 JvmtiTrace::safe_get_thread_name(thread),
1983 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1984 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
1985 location - mh()->code_base() ));
1986
1987 JvmtiEnv *env = ets->get_env();
1988 JvmtiLocationEventMark jem(thread, mh, location);
1989 JvmtiJavaThreadEventTransition jet(thread);
1990 jvmtiEventSingleStep callback = env->callbacks()->SingleStep;
1991 if (callback != nullptr) {
1992 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1993 jem.jni_methodID(), jem.location());
1994 }
1995
1996 ets->set_single_stepping_posted();
1997 }
1998 }
1999 }
2000
2001 void JvmtiExport::post_exception_throw(JavaThread *thread, Method* method, address location, oop exception) {
2002 HandleMark hm(thread);
2003 methodHandle mh(thread, method);
2004 Handle exception_handle(thread, exception);
2005 // The KeepStackGCProcessedMark below keeps the target thread and its stack fully
2006 // GC processed across this scope. This is needed because there is a stack walk
2007 // below with safepoint polls inside of it. After such safepoints, we have to
2008 // ensure the stack is sufficiently processed.
2009 KeepStackGCProcessedMark ksgcpm(thread);
2010
2011 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2012 if (state == nullptr) {
2013 return;
2014 }
2015 if (thread->is_in_any_VTMS_transition()) {
2016 return; // no events should be posted if thread is in any VTMS transition
2017 }
2018
2019 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION, ("[%s] Trg Exception thrown triggered",
2020 JvmtiTrace::safe_get_thread_name(thread)));
2021 if (!state->is_exception_detected()) {
2022 state->set_exception_detected();
2023 JvmtiEnvThreadStateIterator it(state);
2024 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2025 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION) && (exception != nullptr)) {
2026
2027 EVT_TRACE(JVMTI_EVENT_EXCEPTION,
2028 ("[%s] Evt Exception thrown sent %s.%s @ " INTX_FORMAT,
2029 JvmtiTrace::safe_get_thread_name(thread),
2030 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2031 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2032 location - mh()->code_base() ));
2033
2034 JvmtiEnv *env = ets->get_env();
2035 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
2036
2037 // It's okay to clear these exceptions here because we duplicate
2038 // this lookup in InterpreterRuntime::exception_handler_for_exception.
2039 EXCEPTION_MARK;
2040
2041 bool should_repeat;
2042 vframeStream st(thread);
2043 assert(!st.at_end(), "cannot be at end");
2044 Method* current_method = nullptr;
2045 // A GC may occur during the Method::fast_exception_handler_bci_for()
2046 // call below if it needs to load the constraint class. Using a
2047 // methodHandle to keep the 'current_method' from being deallocated
2048 // if GC happens.
2049 methodHandle current_mh = methodHandle(thread, current_method);
2050 int current_bci = -1;
2051 do {
2052 current_method = st.method();
2053 current_mh = methodHandle(thread, current_method);
2054 current_bci = st.bci();
2055 do {
2056 should_repeat = false;
2057 Klass* eh_klass = exception_handle()->klass();
2058 current_bci = Method::fast_exception_handler_bci_for(
2059 current_mh, eh_klass, current_bci, THREAD);
2060 if (HAS_PENDING_EXCEPTION) {
2061 exception_handle = Handle(thread, PENDING_EXCEPTION);
2062 CLEAR_PENDING_EXCEPTION;
2063 should_repeat = true;
2064 }
2065 } while (should_repeat && (current_bci != -1));
2066 st.next();
2067 } while ((current_bci < 0) && (!st.at_end()));
2068
2069 jmethodID catch_jmethodID;
2070 if (current_bci < 0) {
2071 catch_jmethodID = 0;
2072 current_bci = 0;
2073 } else {
2074 catch_jmethodID = jem.to_jmethodID(current_mh);
2075 }
2076
2077 JvmtiJavaThreadEventTransition jet(thread);
2078 jvmtiEventException callback = env->callbacks()->Exception;
2079 if (callback != nullptr) {
2080 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2081 jem.jni_methodID(), jem.location(),
2082 jem.exception(),
2083 catch_jmethodID, current_bci);
2084 }
2085 }
2086 }
2087 }
2088
2089 // frames may get popped because of this throw, be safe - invalidate cached depth
2090 state->invalidate_cur_stack_depth();
2091 }
2092
2093
2094 void JvmtiExport::notice_unwind_due_to_exception(JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) {
2095 HandleMark hm(thread);
2096 methodHandle mh(thread, method);
2097 Handle exception_handle(thread, exception);
2098
2099 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2100 if (state == nullptr) {
2101 return;
2102 }
2103 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
2104 ("[%s] Trg unwind_due_to_exception triggered %s.%s @ %s" INTX_FORMAT " - %s",
2105 JvmtiTrace::safe_get_thread_name(thread),
2106 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2107 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2108 location==0? "no location:" : "",
2109 location==0? 0 : location - mh()->code_base(),
2110 in_handler_frame? "in handler frame" : "not handler frame" ));
2111
2112 if (state->is_exception_detected()) {
2113
2114 state->invalidate_cur_stack_depth();
2115 if (!in_handler_frame) {
2116 // Not in exception handler.
2117 if(state->is_interp_only_mode()) {
2118 // method exit and frame pop events are posted only in interp mode.
2119 // When these events are enabled code should be in running in interp mode.
2120 jvalue no_value;
2121 no_value.j = 0L;
2122 JvmtiExport::post_method_exit_inner(thread, mh, state, true, thread->last_frame(), no_value);
2123 // The cached cur_stack_depth might have changed from the
2124 // operations of frame pop or method exit. We are not 100% sure
2125 // the cached cur_stack_depth is still valid depth so invalidate
2126 // it.
2127 state->invalidate_cur_stack_depth();
2128 }
2129 } else {
2130 // In exception handler frame. Report exception catch.
2131 assert(location != nullptr, "must be a known location");
2132 // Update cur_stack_depth - the frames above the current frame
2133 // have been unwound due to this exception:
2134 assert(!state->is_exception_caught(), "exception must not be caught yet.");
2135 state->set_exception_caught();
2136
2137 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
2138 return; // no events should be posted if thread is in any VTMS transition
2139 }
2140 JvmtiEnvThreadStateIterator it(state);
2141 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2142 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION_CATCH) && (exception_handle() != nullptr)) {
2143 EVT_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
2144 ("[%s] Evt ExceptionCatch sent %s.%s @ " INTX_FORMAT,
2145 JvmtiTrace::safe_get_thread_name(thread),
2146 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2147 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2148 location - mh()->code_base() ));
2149
2150 JvmtiEnv *env = ets->get_env();
2151 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
2152 JvmtiJavaThreadEventTransition jet(thread);
2153 jvmtiEventExceptionCatch callback = env->callbacks()->ExceptionCatch;
2154 if (callback != nullptr) {
2155 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2156 jem.jni_methodID(), jem.location(),
2157 jem.exception());
2158 }
2159 }
2160 }
2161 }
2162 }
2163 }
2164
2165 oop JvmtiExport::jni_GetField_probe(JavaThread *thread, jobject jobj, oop obj,
2166 Klass* klass, jfieldID fieldID, bool is_static) {
2167 if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) {
2168 // At least one field access watch is set so we have more work to do.
2169 post_field_access_by_jni(thread, obj, klass, fieldID, is_static);
2170 // event posting can block so refetch oop if we were passed a jobj
2171 if (jobj != nullptr) return JNIHandles::resolve_non_null(jobj);
2172 }
2173 return obj;
2174 }
2175
2176 void JvmtiExport::post_field_access_by_jni(JavaThread *thread, oop obj,
2177 Klass* klass, jfieldID fieldID, bool is_static) {
2178 // We must be called with a Java context in order to provide reasonable
2179 // values for the klazz, method, and location fields. The callers of this
2180 // function don't make the call unless there is a Java context.
2181 assert(thread->has_last_Java_frame(), "must be called with a Java context");
2182
2183 if (thread->is_in_any_VTMS_transition()) {
2184 return; // no events should be posted if thread is in any VTMS transition
2185 }
2186
2187 ResourceMark rm;
2188 fieldDescriptor fd;
2189 // if get_field_descriptor finds fieldID to be invalid, then we just bail
2190 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
2191 assert(valid_fieldID == true,"post_field_access_by_jni called with invalid fieldID");
2192 if (!valid_fieldID) return;
2193 // field accesses are not watched so bail
2194 if (!fd.is_field_access_watched()) return;
2195
2196 HandleMark hm(thread);
2197 Handle h_obj;
2198 if (!is_static) {
2199 // non-static field accessors have an object, but we need a handle
2200 assert(obj != nullptr, "non-static needs an object");
2201 h_obj = Handle(thread, obj);
2202 }
2203 post_field_access(thread,
2204 thread->last_frame().interpreter_frame_method(),
2205 thread->last_frame().interpreter_frame_bcp(),
2206 klass, h_obj, fieldID);
2207 }
2208
2209 void JvmtiExport::post_field_access(JavaThread *thread, Method* method,
2210 address location, Klass* field_klass, Handle object, jfieldID field) {
2211
2212 HandleMark hm(thread);
2213 methodHandle mh(thread, method);
2214
2215 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2216 if (state == nullptr) {
2217 return;
2218 }
2219 if (thread->is_in_any_VTMS_transition()) {
2220 return; // no events should be posted if thread is in any VTMS transition
2221 }
2222
2223 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Trg Field Access event triggered",
2224 JvmtiTrace::safe_get_thread_name(thread)));
2225 JvmtiEnvThreadStateIterator it(state);
2226 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2227 if (ets->is_enabled(JVMTI_EVENT_FIELD_ACCESS)) {
2228 EVT_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Evt Field Access event sent %s.%s @ " INTX_FORMAT,
2229 JvmtiTrace::safe_get_thread_name(thread),
2230 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2231 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2232 location - mh()->code_base() ));
2233
2234 JvmtiEnv *env = ets->get_env();
2235 JvmtiLocationEventMark jem(thread, mh, location);
2236 jclass field_jclass = jem.to_jclass(field_klass);
2237 jobject field_jobject = jem.to_jobject(object());
2238 JvmtiJavaThreadEventTransition jet(thread);
2239 jvmtiEventFieldAccess callback = env->callbacks()->FieldAccess;
2240 if (callback != nullptr) {
2241 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2242 jem.jni_methodID(), jem.location(),
2243 field_jclass, field_jobject, field);
2244 }
2245 }
2246 }
2247 }
2248
2249 oop JvmtiExport::jni_SetField_probe(JavaThread *thread, jobject jobj, oop obj,
2250 Klass* klass, jfieldID fieldID, bool is_static,
2251 char sig_type, jvalue *value) {
2252 if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) {
2253 // At least one field modification watch is set so we have more work to do.
2254 post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value);
2255 // event posting can block so refetch oop if we were passed a jobj
2256 if (jobj != nullptr) return JNIHandles::resolve_non_null(jobj);
2257 }
2258 return obj;
2259 }
2260
2261 void JvmtiExport::post_field_modification_by_jni(JavaThread *thread, oop obj,
2262 Klass* klass, jfieldID fieldID, bool is_static,
2263 char sig_type, jvalue *value) {
2264 // We must be called with a Java context in order to provide reasonable
2265 // values for the klazz, method, and location fields. The callers of this
2266 // function don't make the call unless there is a Java context.
2267 assert(thread->has_last_Java_frame(), "must be called with Java context");
2268
2269 if (thread->is_in_any_VTMS_transition()) {
2270 return; // no events should be posted if thread is in any VTMS transition
2271 }
2272
2273 ResourceMark rm;
2274 fieldDescriptor fd;
2275 // if get_field_descriptor finds fieldID to be invalid, then we just bail
2276 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
2277 assert(valid_fieldID == true,"post_field_modification_by_jni called with invalid fieldID");
2278 if (!valid_fieldID) return;
2279 // field modifications are not watched so bail
2280 if (!fd.is_field_modification_watched()) return;
2281
2282 HandleMark hm(thread);
2283
2284 Handle h_obj;
2285 if (!is_static) {
2286 // non-static field accessors have an object, but we need a handle
2287 assert(obj != nullptr, "non-static needs an object");
2288 h_obj = Handle(thread, obj);
2289 }
2290 post_field_modification(thread,
2291 thread->last_frame().interpreter_frame_method(),
2292 thread->last_frame().interpreter_frame_bcp(),
2293 klass, h_obj, fieldID, sig_type, value);
2294 }
2295
2296 void JvmtiExport::post_raw_field_modification(JavaThread *thread, Method* method,
2297 address location, Klass* field_klass, Handle object, jfieldID field,
2298 char sig_type, jvalue *value) {
2299
2300 if (thread->is_in_any_VTMS_transition()) {
2301 return; // no events should be posted if thread is in any VTMS transition
2302 }
2303
2304 if (sig_type == JVM_SIGNATURE_INT || sig_type == JVM_SIGNATURE_BOOLEAN ||
2305 sig_type == JVM_SIGNATURE_BYTE || sig_type == JVM_SIGNATURE_CHAR ||
2306 sig_type == JVM_SIGNATURE_SHORT) {
2307 // 'I' instructions are used for byte, char, short and int.
2308 // determine which it really is, and convert
2309 fieldDescriptor fd;
2310 bool found = JvmtiEnv::get_field_descriptor(field_klass, field, &fd);
2311 // should be found (if not, leave as is)
2312 if (found) {
2313 jint ival = value->i;
2314 // convert value from int to appropriate type
2315 switch (fd.field_type()) {
2316 case T_BOOLEAN:
2317 sig_type = JVM_SIGNATURE_BOOLEAN;
2318 value->i = 0; // clear it
2319 value->z = (jboolean)ival;
2320 break;
2321 case T_BYTE:
2322 sig_type = JVM_SIGNATURE_BYTE;
2323 value->i = 0; // clear it
2324 value->b = (jbyte)ival;
2325 break;
2326 case T_CHAR:
2327 sig_type = JVM_SIGNATURE_CHAR;
2328 value->i = 0; // clear it
2329 value->c = (jchar)ival;
2330 break;
2331 case T_SHORT:
2332 sig_type = JVM_SIGNATURE_SHORT;
2333 value->i = 0; // clear it
2334 value->s = (jshort)ival;
2335 break;
2336 case T_INT:
2337 // nothing to do
2338 break;
2339 default:
2340 // this is an integer instruction, should be one of above
2341 ShouldNotReachHere();
2342 break;
2343 }
2344 }
2345 }
2346
2347 assert(sig_type != JVM_SIGNATURE_ARRAY, "array should have sig_type == 'L'");
2348 bool handle_created = false;
2349
2350 // convert oop to JNI handle.
2351 if (sig_type == JVM_SIGNATURE_CLASS) {
2352 handle_created = true;
2353 value->l = (jobject)JNIHandles::make_local(thread, cast_to_oop(value->l));
2354 }
2355
2356 post_field_modification(thread, method, location, field_klass, object, field, sig_type, value);
2357
2358 // Destroy the JNI handle allocated above.
2359 if (handle_created) {
2360 JNIHandles::destroy_local(value->l);
2361 }
2362 }
2363
2364 void JvmtiExport::post_field_modification(JavaThread *thread, Method* method,
2365 address location, Klass* field_klass, Handle object, jfieldID field,
2366 char sig_type, jvalue *value_ptr) {
2367
2368 HandleMark hm(thread);
2369 methodHandle mh(thread, method);
2370
2371 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2372 if (state == nullptr) {
2373 return;
2374 }
2375 if (thread->is_in_any_VTMS_transition()) {
2376 return; // no events should be posted if thread is in any VTMS transition
2377 }
2378
2379 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
2380 ("[%s] Trg Field Modification event triggered",
2381 JvmtiTrace::safe_get_thread_name(thread)));
2382 JvmtiEnvThreadStateIterator it(state);
2383 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2384 if (ets->is_enabled(JVMTI_EVENT_FIELD_MODIFICATION)) {
2385 EVT_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
2386 ("[%s] Evt Field Modification event sent %s.%s @ " INTX_FORMAT,
2387 JvmtiTrace::safe_get_thread_name(thread),
2388 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2389 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2390 location - mh()->code_base() ));
2391
2392 JvmtiEnv *env = ets->get_env();
2393 JvmtiLocationEventMark jem(thread, mh, location);
2394 jclass field_jclass = jem.to_jclass(field_klass);
2395 jobject field_jobject = jem.to_jobject(object());
2396 JvmtiJavaThreadEventTransition jet(thread);
2397 jvmtiEventFieldModification callback = env->callbacks()->FieldModification;
2398 if (callback != nullptr) {
2399 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2400 jem.jni_methodID(), jem.location(),
2401 field_jclass, field_jobject, field, sig_type, *value_ptr);
2402 }
2403 }
2404 }
2405 }
2406
2407 void JvmtiExport::post_native_method_bind(Method* method, address* function_ptr) {
2408 JavaThread* thread = JavaThread::current();
2409 assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
2410
2411 HandleMark hm(thread);
2412 methodHandle mh(thread, method);
2413
2414 if (thread->is_in_any_VTMS_transition()) {
2415 return; // no events should be posted if thread is in any VTMS transition
2416 }
2417 EVT_TRIG_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Trg Native Method Bind event triggered",
2418 JvmtiTrace::safe_get_thread_name(thread)));
2419
2420 if (JvmtiEventController::is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
2421 JvmtiEnvIterator it;
2422 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2423 if (env->is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
2424 EVT_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Evt Native Method Bind event sent",
2425 JvmtiTrace::safe_get_thread_name(thread) ));
2426
2427 JvmtiMethodEventMark jem(thread, mh);
2428 JvmtiJavaThreadEventTransition jet(thread);
2429 JNIEnv* jni_env = (env->phase() == JVMTI_PHASE_PRIMORDIAL) ? nullptr : jem.jni_env();
2430 jvmtiEventNativeMethodBind callback = env->callbacks()->NativeMethodBind;
2431 if (callback != nullptr) {
2432 (*callback)(env->jvmti_external(), jni_env, jem.jni_thread(),
2433 jem.jni_methodID(), (void*)(*function_ptr), (void**)function_ptr);
2434 }
2435 }
2436 }
2437 }
2438 }
2439
2440 // Returns a record containing inlining information for the given nmethod
2441 static jvmtiCompiledMethodLoadInlineRecord* create_inline_record(nmethod* nm) {
2442 jint numstackframes = 0;
2443 jvmtiCompiledMethodLoadInlineRecord* record = (jvmtiCompiledMethodLoadInlineRecord*)NEW_RESOURCE_OBJ(jvmtiCompiledMethodLoadInlineRecord);
2444 record->header.kind = JVMTI_CMLR_INLINE_INFO;
2445 record->header.next = nullptr;
2446 record->header.majorinfoversion = JVMTI_CMLR_MAJOR_VERSION_1;
2447 record->header.minorinfoversion = JVMTI_CMLR_MINOR_VERSION_0;
2448 record->numpcs = 0;
2449 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
2450 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
2451 record->numpcs++;
2452 }
2453 record->pcinfo = (PCStackInfo*)(NEW_RESOURCE_ARRAY(PCStackInfo, record->numpcs));
2454 int scope = 0;
2455 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
2456 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
2457 void* pc_address = (void*)p->real_pc(nm);
2458 assert(pc_address != nullptr, "pc_address must be non-null");
2459 record->pcinfo[scope].pc = pc_address;
2460 numstackframes=0;
2461 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != nullptr;sd = sd->sender()) {
2462 numstackframes++;
2463 }
2464 assert(numstackframes != 0, "numstackframes must be nonzero.");
2465 record->pcinfo[scope].methods = (jmethodID *)NEW_RESOURCE_ARRAY(jmethodID, numstackframes);
2466 record->pcinfo[scope].bcis = (jint *)NEW_RESOURCE_ARRAY(jint, numstackframes);
2467 record->pcinfo[scope].numstackframes = numstackframes;
2468 int stackframe = 0;
2469 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != nullptr;sd = sd->sender()) {
2470 // 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()
2471 guarantee(sd->method() != nullptr, "sd->method() cannot be null.");
2472 record->pcinfo[scope].methods[stackframe] = sd->method()->jmethod_id();
2473 record->pcinfo[scope].bcis[stackframe] = sd->bci();
2474 stackframe++;
2475 }
2476 scope++;
2477 }
2478 return record;
2479 }
2480
2481 void JvmtiExport::post_compiled_method_load(nmethod *nm) {
2482 guarantee(!nm->is_unloading(), "nmethod isn't unloaded or unloading");
2483 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
2484 return;
2485 }
2486 JavaThread* thread = JavaThread::current();
2487
2488 assert(!thread->is_in_any_VTMS_transition(), "compiled method load events are not allowed in any VTMS transition");
2489
2490 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2491 ("[%s] method compile load event triggered",
2492 JvmtiTrace::safe_get_thread_name(thread)));
2493
2494 JvmtiEnvIterator it;
2495 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2496 post_compiled_method_load(env, nm);
2497 }
2498 }
2499
2500 // post a COMPILED_METHOD_LOAD event for a given environment
2501 void JvmtiExport::post_compiled_method_load(JvmtiEnv* env, nmethod *nm) {
2502 if (env->phase() == JVMTI_PHASE_PRIMORDIAL || !env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) {
2503 return;
2504 }
2505 jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad;
2506 if (callback == nullptr) {
2507 return;
2508 }
2509 JavaThread* thread = JavaThread::current();
2510
2511 assert(!thread->is_in_any_VTMS_transition(), "compiled method load events are not allowed in any VTMS transition");
2512
2513 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2514 ("[%s] method compile load event sent %s.%s ",
2515 JvmtiTrace::safe_get_thread_name(thread),
2516 (nm->method() == nullptr) ? "null" : nm->method()->klass_name()->as_C_string(),
2517 (nm->method() == nullptr) ? "null" : nm->method()->name()->as_C_string()));
2518 ResourceMark rm(thread);
2519 HandleMark hm(thread);
2520
2521 // Add inlining information
2522 jvmtiCompiledMethodLoadInlineRecord* inlinerecord = create_inline_record(nm);
2523 // Pass inlining information through the void pointer
2524 JvmtiCompiledMethodLoadEventMark jem(thread, nm, inlinerecord);
2525 JvmtiJavaThreadEventTransition jet(thread);
2526 (*callback)(env->jvmti_external(), jem.jni_methodID(),
2527 jem.code_size(), jem.code_data(), jem.map_length(),
2528 jem.map(), jem.compile_info());
2529 }
2530
2531 void JvmtiExport::post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) {
2532 assert(name != nullptr && name[0] != '\0', "sanity check");
2533
2534 JavaThread* thread = JavaThread::current();
2535
2536 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition");
2537
2538 // In theory everyone coming thru here is in_vm but we need to be certain
2539 // because a callee will do a vm->native transition
2540 ThreadInVMfromUnknown __tiv;
2541
2542 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2543 ("[%s] method dynamic code generated event triggered",
2544 JvmtiTrace::safe_get_thread_name(thread)));
2545 JvmtiEnvIterator it;
2546 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2547 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
2548 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2549 ("[%s] dynamic code generated event sent for %s",
2550 JvmtiTrace::safe_get_thread_name(thread), name));
2551 JvmtiEventMark jem(thread);
2552 JvmtiJavaThreadEventTransition jet(thread);
2553 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
2554 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
2555 if (callback != nullptr) {
2556 (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
2557 }
2558 }
2559 }
2560 }
2561
2562 void JvmtiExport::post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) {
2563 jvmtiPhase phase = JvmtiEnv::get_phase();
2564 if (phase == JVMTI_PHASE_PRIMORDIAL || phase == JVMTI_PHASE_START) {
2565 post_dynamic_code_generated_internal(name, code_begin, code_end);
2566 } else {
2567 // It may not be safe to post the event from this thread. Defer all
2568 // postings to the service thread so that it can perform them in a safe
2569 // context and in-order.
2570 JvmtiDeferredEvent event = JvmtiDeferredEvent::dynamic_code_generated_event(
2571 name, code_begin, code_end);
2572 ServiceThread::enqueue_deferred_event(&event);
2573 }
2574 }
2575
2576
2577 // post a DYNAMIC_CODE_GENERATED event for a given environment
2578 // used by GenerateEvents
2579 void JvmtiExport::post_dynamic_code_generated(JvmtiEnv* env, const char *name,
2580 const void *code_begin, const void *code_end)
2581 {
2582 JavaThread* thread = JavaThread::current();
2583
2584 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition");
2585
2586 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2587 ("[%s] dynamic code generated event triggered (by GenerateEvents)",
2588 JvmtiTrace::safe_get_thread_name(thread)));
2589 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
2590 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2591 ("[%s] dynamic code generated event sent for %s",
2592 JvmtiTrace::safe_get_thread_name(thread), name));
2593 JvmtiEventMark jem(thread);
2594 JvmtiJavaThreadEventTransition jet(thread);
2595 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
2596 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
2597 if (callback != nullptr) {
2598 (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
2599 }
2600 }
2601 }
2602
2603 // post a DynamicCodeGenerated event while holding locks in the VM.
2604 void JvmtiExport::post_dynamic_code_generated_while_holding_locks(const char* name,
2605 address code_begin, address code_end)
2606 {
2607 JavaThread* thread = JavaThread::current();
2608 // register the stub with the current dynamic code event collector
2609 // Cannot take safepoint here so do not use state_for to get
2610 // jvmti thread state.
2611 // The collector and/or state might be null if JvmtiDynamicCodeEventCollector
2612 // has been initialized while JVMTI_EVENT_DYNAMIC_CODE_GENERATED was disabled.
2613 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2614 if (state != nullptr) {
2615 JvmtiDynamicCodeEventCollector *collector = state->get_dynamic_code_event_collector();
2616 if (collector != nullptr) {
2617 collector->register_stub(name, code_begin, code_end);
2618 }
2619 }
2620 }
2621
2622 // Collect all the vm internally allocated objects which are visible to java world
2623 void JvmtiExport::record_vm_internal_object_allocation(oop obj) {
2624 Thread* thread = Thread::current_or_null();
2625 if (thread != nullptr && thread->is_Java_thread()) {
2626 // Can not take safepoint here.
2627 NoSafepointVerifier no_sfpt;
2628 // Cannot take safepoint here so do not use state_for to get
2629 // jvmti thread state.
2630 JvmtiThreadState *state = JavaThread::cast(thread)->jvmti_thread_state();
2631 if (state != nullptr) {
2632 // state is non null when VMObjectAllocEventCollector is enabled.
2633 JvmtiVMObjectAllocEventCollector *collector;
2634 collector = state->get_vm_object_alloc_event_collector();
2635 if (collector != nullptr && collector->is_enabled()) {
2636 // Don't record classes as these will be notified via the ClassLoad
2637 // event.
2638 if (obj->klass() != vmClasses::Class_klass()) {
2639 collector->record_allocation(obj);
2640 }
2641 }
2642 }
2643 }
2644 }
2645
2646 // Collect all the sampled allocated objects.
2647 void JvmtiExport::record_sampled_internal_object_allocation(oop obj) {
2648 Thread* thread = Thread::current_or_null();
2649 if (thread != nullptr && thread->is_Java_thread()) {
2650 // Can not take safepoint here.
2651 NoSafepointVerifier no_sfpt;
2652 // Cannot take safepoint here so do not use state_for to get
2653 // jvmti thread state.
2654 JvmtiThreadState *state = JavaThread::cast(thread)->jvmti_thread_state();
2655 if (state != nullptr) {
2656 // state is non null when SampledObjectAllocEventCollector is enabled.
2657 JvmtiSampledObjectAllocEventCollector *collector;
2658 collector = state->get_sampled_object_alloc_event_collector();
2659
2660 if (collector != nullptr && collector->is_enabled()) {
2661 collector->record_allocation(obj);
2662 }
2663 }
2664 }
2665 }
2666
2667 void JvmtiExport::post_garbage_collection_finish() {
2668 Thread *thread = Thread::current(); // this event is posted from VM-Thread.
2669 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
2670 ("[%s] garbage collection finish event triggered",
2671 JvmtiTrace::safe_get_thread_name(thread)));
2672 JvmtiEnvIterator it;
2673 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2674 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH)) {
2675 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
2676 ("[%s] garbage collection finish event sent",
2677 JvmtiTrace::safe_get_thread_name(thread)));
2678 JvmtiThreadEventTransition jet(thread);
2679 // JNIEnv is null here because this event is posted from VM Thread
2680 jvmtiEventGarbageCollectionFinish callback = env->callbacks()->GarbageCollectionFinish;
2681 if (callback != nullptr) {
2682 (*callback)(env->jvmti_external());
2683 }
2684 }
2685 }
2686 }
2687
2688 void JvmtiExport::post_garbage_collection_start() {
2689 Thread* thread = Thread::current(); // this event is posted from vm-thread.
2690 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
2691 ("[%s] garbage collection start event triggered",
2692 JvmtiTrace::safe_get_thread_name(thread)));
2693 JvmtiEnvIterator it;
2694 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2695 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_START)) {
2696 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
2697 ("[%s] garbage collection start event sent",
2698 JvmtiTrace::safe_get_thread_name(thread)));
2699 JvmtiThreadEventTransition jet(thread);
2700 // JNIEnv is null here because this event is posted from VM Thread
2701 jvmtiEventGarbageCollectionStart callback = env->callbacks()->GarbageCollectionStart;
2702 if (callback != nullptr) {
2703 (*callback)(env->jvmti_external());
2704 }
2705 }
2706 }
2707 }
2708
2709 void JvmtiExport::post_data_dump() {
2710 Thread *thread = Thread::current();
2711 EVT_TRIG_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
2712 ("[%s] data dump request event triggered",
2713 JvmtiTrace::safe_get_thread_name(thread)));
2714 JvmtiEnvIterator it;
2715 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2716 if (env->is_enabled(JVMTI_EVENT_DATA_DUMP_REQUEST)) {
2717 EVT_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
2718 ("[%s] data dump request event sent",
2719 JvmtiTrace::safe_get_thread_name(thread)));
2720 JvmtiThreadEventTransition jet(thread);
2721 // JNIEnv is null here because this event is posted from VM Thread
2722 jvmtiEventDataDumpRequest callback = env->callbacks()->DataDumpRequest;
2723 if (callback != nullptr) {
2724 (*callback)(env->jvmti_external());
2725 }
2726 }
2727 }
2728 }
2729
2730 void JvmtiExport::post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) {
2731 oop object = obj_mntr->object();
2732 HandleMark hm(thread);
2733 Handle h(thread, object);
2734
2735 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2736 if (state == nullptr) {
2737 return;
2738 }
2739 if (thread->is_in_any_VTMS_transition()) {
2740 return; // no events should be posted if thread is in any VTMS transition
2741 }
2742
2743 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2744 ("[%s] monitor contended enter event triggered",
2745 JvmtiTrace::safe_get_thread_name(thread)));
2746 JvmtiEnvThreadStateIterator it(state);
2747 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2748 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTER)) {
2749 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2750 ("[%s] monitor contended enter event sent",
2751 JvmtiTrace::safe_get_thread_name(thread)));
2752 JvmtiMonitorEventMark jem(thread, h());
2753 JvmtiEnv *env = ets->get_env();
2754 JvmtiThreadEventTransition jet(thread);
2755 jvmtiEventMonitorContendedEnter callback = env->callbacks()->MonitorContendedEnter;
2756 if (callback != nullptr) {
2757 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2758 }
2759 }
2760 }
2761 }
2762
2763 void JvmtiExport::post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) {
2764 oop object = obj_mntr->object();
2765 HandleMark hm(thread);
2766 Handle h(thread, object);
2767
2768 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2769 if (state == nullptr) {
2770 return;
2771 }
2772 if (thread->is_in_any_VTMS_transition()) {
2773 return; // no events should be posted if thread is in any VTMS transition
2774 }
2775
2776 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2777 ("[%s] monitor contended entered event triggered",
2778 JvmtiTrace::safe_get_thread_name(thread)));
2779
2780 JvmtiEnvThreadStateIterator it(state);
2781 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2782 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED)) {
2783 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2784 ("[%s] monitor contended enter event sent",
2785 JvmtiTrace::safe_get_thread_name(thread)));
2786 JvmtiMonitorEventMark jem(thread, h());
2787 JvmtiEnv *env = ets->get_env();
2788 JvmtiThreadEventTransition jet(thread);
2789 jvmtiEventMonitorContendedEntered callback = env->callbacks()->MonitorContendedEntered;
2790 if (callback != nullptr) {
2791 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2792 }
2793 }
2794 }
2795 }
2796
2797 void JvmtiExport::post_monitor_wait(JavaThread *thread, oop object,
2798 jlong timeout) {
2799 HandleMark hm(thread);
2800 Handle h(thread, object);
2801
2802 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2803 if (state == nullptr) {
2804 return;
2805 }
2806 if (thread->is_in_any_VTMS_transition()) {
2807 return; // no events should be posted if thread is in any VTMS transition
2808 }
2809
2810 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2811 ("[%s] monitor wait event triggered",
2812 JvmtiTrace::safe_get_thread_name(thread)));
2813 JvmtiEnvThreadStateIterator it(state);
2814 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2815 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAIT)) {
2816 EVT_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2817 ("[%s] monitor wait event sent",
2818 JvmtiTrace::safe_get_thread_name(thread)));
2819 JvmtiMonitorEventMark jem(thread, h());
2820 JvmtiEnv *env = ets->get_env();
2821 JvmtiThreadEventTransition jet(thread);
2822 jvmtiEventMonitorWait callback = env->callbacks()->MonitorWait;
2823 if (callback != nullptr) {
2824 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2825 jem.jni_object(), timeout);
2826 }
2827 }
2828 }
2829 }
2830
2831 void JvmtiExport::post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) {
2832 oop object = obj_mntr->object();
2833 HandleMark hm(thread);
2834 Handle h(thread, object);
2835
2836 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2837 if (state == nullptr) {
2838 return;
2839 }
2840 if (thread->is_in_any_VTMS_transition()) {
2841 return; // no events should be posted if thread is in any VTMS transition
2842 }
2843
2844 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2845 ("[%s] monitor waited event triggered",
2846 JvmtiTrace::safe_get_thread_name(thread)));
2847 JvmtiEnvThreadStateIterator it(state);
2848 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2849 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAITED)) {
2850 EVT_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2851 ("[%s] monitor waited event sent",
2852 JvmtiTrace::safe_get_thread_name(thread)));
2853 JvmtiMonitorEventMark jem(thread, h());
2854 JvmtiEnv *env = ets->get_env();
2855 JvmtiThreadEventTransition jet(thread);
2856 jvmtiEventMonitorWaited callback = env->callbacks()->MonitorWaited;
2857 if (callback != nullptr) {
2858 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2859 jem.jni_object(), timed_out);
2860 }
2861 }
2862 }
2863 }
2864
2865 void JvmtiExport::post_vm_object_alloc(JavaThread *thread, oop object) {
2866 if (object == nullptr) {
2867 return;
2868 }
2869 if (thread->is_in_any_VTMS_transition()) {
2870 return; // no events should be posted if thread is in any VTMS transition
2871 }
2872 HandleMark hm(thread);
2873 Handle h(thread, object);
2874
2875 EVT_TRIG_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Trg vm object alloc triggered",
2876 JvmtiTrace::safe_get_thread_name(thread)));
2877 JvmtiEnvIterator it;
2878 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2879 if (env->is_enabled(JVMTI_EVENT_VM_OBJECT_ALLOC)) {
2880 EVT_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Evt vmobject alloc sent %s",
2881 JvmtiTrace::safe_get_thread_name(thread),
2882 object==nullptr? "null" : object->klass()->external_name()));
2883
2884 JvmtiObjectAllocEventMark jem(thread, h());
2885 JvmtiJavaThreadEventTransition jet(thread);
2886 jvmtiEventVMObjectAlloc callback = env->callbacks()->VMObjectAlloc;
2887 if (callback != nullptr) {
2888 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2889 jem.jni_jobject(), jem.jni_class(), jem.size());
2890 }
2891 }
2892 }
2893 }
2894
2895 void JvmtiExport::post_sampled_object_alloc(JavaThread *thread, oop object) {
2896 HandleMark hm(thread);
2897 Handle h(thread, object);
2898
2899 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2900 if (state == nullptr) {
2901 return;
2902 }
2903 if (object == nullptr) {
2904 return;
2905 }
2906 if (thread->is_in_any_VTMS_transition()) {
2907 return; // no events should be posted if thread is in any VTMS transition
2908 }
2909
2910 EVT_TRIG_TRACE(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC,
2911 ("[%s] Trg sampled object alloc triggered",
2912 JvmtiTrace::safe_get_thread_name(thread)));
2913 JvmtiEnvThreadStateIterator it(state);
2914 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2915 if (ets->is_enabled(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC)) {
2916 EVT_TRACE(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC,
2917 ("[%s] Evt sampled object alloc sent %s",
2918 JvmtiTrace::safe_get_thread_name(thread),
2919 object == nullptr ? "null" : object->klass()->external_name()));
2920
2921 JvmtiEnv *env = ets->get_env();
2922 JvmtiObjectAllocEventMark jem(thread, h());
2923 JvmtiJavaThreadEventTransition jet(thread);
2924 jvmtiEventSampledObjectAlloc callback = env->callbacks()->SampledObjectAlloc;
2925 if (callback != nullptr) {
2926 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2927 jem.jni_jobject(), jem.jni_class(), jem.size());
2928 }
2929 }
2930 }
2931 }
2932
2933 ////////////////////////////////////////////////////////////////////////////////////////////////
2934
2935 void JvmtiExport::cleanup_thread(JavaThread* thread) {
2936 assert(JavaThread::current() == thread, "thread is not current");
2937 MutexLocker mu(thread, JvmtiThreadState_lock);
2938
2939 if (thread->jvmti_thread_state() != nullptr) {
2940 // This has to happen after the thread state is removed, which is
2941 // why it is not in post_thread_end_event like its complement
2942 // Maybe both these functions should be rolled into the posts?
2943 JvmtiEventController::thread_ended(thread);
2944 }
2945 }
2946
2947 void JvmtiExport::clear_detected_exception(JavaThread* thread) {
2948 assert(JavaThread::current() == thread, "thread is not current");
2949
2950 JvmtiThreadState* state = thread->jvmti_thread_state();
2951 if (state != nullptr) {
2952 state->clear_exception_state();
2953 }
2954 }
2955
2956 // Onload raw monitor transition.
2957 void JvmtiExport::transition_pending_onload_raw_monitors() {
2958 JvmtiPendingMonitors::transition_raw_monitors();
2959 }
2960
2961 // Setup current current thread for event collection.
2962 void JvmtiEventCollector::setup_jvmti_thread_state() {
2963 // set this event collector to be the current one.
2964 JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current());
2965 // state can only be null if the current thread is exiting which
2966 // should not happen since we're trying to configure for event collection
2967 guarantee(state != nullptr, "exiting thread called setup_jvmti_thread_state");
2968 if (is_vm_object_alloc_event()) {
2969 JvmtiVMObjectAllocEventCollector *prev = state->get_vm_object_alloc_event_collector();
2970
2971 // If we have a previous collector and it is disabled, it means this allocation came from a
2972 // callback induced VM Object allocation, do not register this collector then.
2973 if (prev && !prev->is_enabled()) {
2974 return;
2975 }
2976 _prev = prev;
2977 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)this);
2978 } else if (is_dynamic_code_event()) {
2979 _prev = state->get_dynamic_code_event_collector();
2980 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)this);
2981 } else if (is_sampled_object_alloc_event()) {
2982 JvmtiSampledObjectAllocEventCollector *prev = state->get_sampled_object_alloc_event_collector();
2983
2984 if (prev) {
2985 // JvmtiSampledObjectAllocEventCollector wants only one active collector
2986 // enabled. This allows to have a collector detect a user code requiring
2987 // a sample in the callback.
2988 return;
2989 }
2990 state->set_sampled_object_alloc_event_collector((JvmtiSampledObjectAllocEventCollector*) this);
2991 }
2992
2993 _unset_jvmti_thread_state = true;
2994 }
2995
2996 // Unset current event collection in this thread and reset it with previous
2997 // collector.
2998 void JvmtiEventCollector::unset_jvmti_thread_state() {
2999 if (!_unset_jvmti_thread_state) {
3000 return;
3001 }
3002
3003 JvmtiThreadState* state = JavaThread::current()->jvmti_thread_state();
3004 if (state != nullptr) {
3005 // restore the previous event collector (if any)
3006 if (is_vm_object_alloc_event()) {
3007 if (state->get_vm_object_alloc_event_collector() == this) {
3008 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)_prev);
3009 } else {
3010 // this thread's jvmti state was created during the scope of
3011 // the event collector.
3012 }
3013 } else if (is_dynamic_code_event()) {
3014 if (state->get_dynamic_code_event_collector() == this) {
3015 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)_prev);
3016 } else {
3017 // this thread's jvmti state was created during the scope of
3018 // the event collector.
3019 }
3020 } else if (is_sampled_object_alloc_event()) {
3021 if (state->get_sampled_object_alloc_event_collector() == this) {
3022 state->set_sampled_object_alloc_event_collector((JvmtiSampledObjectAllocEventCollector*)_prev);
3023 } else {
3024 // this thread's jvmti state was created during the scope of
3025 // the event collector.
3026 }
3027 }
3028 }
3029 }
3030
3031 // create the dynamic code event collector
3032 JvmtiDynamicCodeEventCollector::JvmtiDynamicCodeEventCollector() : _code_blobs(nullptr) {
3033 if (JvmtiExport::should_post_dynamic_code_generated()) {
3034 setup_jvmti_thread_state();
3035 }
3036 }
3037
3038 // iterate over any code blob descriptors collected and post a
3039 // DYNAMIC_CODE_GENERATED event to the profiler.
3040 JvmtiDynamicCodeEventCollector::~JvmtiDynamicCodeEventCollector() {
3041 assert(!JavaThread::current()->owns_locks(), "all locks must be released to post deferred events");
3042 // iterate over any code blob descriptors that we collected
3043 if (_code_blobs != nullptr) {
3044 for (int i=0; i<_code_blobs->length(); i++) {
3045 JvmtiCodeBlobDesc* blob = _code_blobs->at(i);
3046 JvmtiExport::post_dynamic_code_generated(blob->name(), blob->code_begin(), blob->code_end());
3047 FreeHeap(blob);
3048 }
3049 delete _code_blobs;
3050 }
3051 unset_jvmti_thread_state();
3052 }
3053
3054 // register a stub
3055 void JvmtiDynamicCodeEventCollector::register_stub(const char* name, address start, address end) {
3056 if (_code_blobs == nullptr) {
3057 _code_blobs = new (mtServiceability) GrowableArray<JvmtiCodeBlobDesc*>(1, mtServiceability);
3058 }
3059 _code_blobs->append(new JvmtiCodeBlobDesc(name, start, end));
3060 }
3061
3062 // Setup current thread to record vm allocated objects.
3063 JvmtiObjectAllocEventCollector::JvmtiObjectAllocEventCollector() :
3064 _allocated(nullptr), _enable(false), _post_callback(nullptr) {
3065 }
3066
3067 // Post vm_object_alloc event for vm allocated objects visible to java
3068 // world.
3069 void JvmtiObjectAllocEventCollector::generate_call_for_allocated() {
3070 if (_allocated) {
3071 set_enabled(false);
3072 for (int i = 0; i < _allocated->length(); i++) {
3073 oop obj = _allocated->at(i).resolve();
3074 _post_callback(JavaThread::current(), obj);
3075 // Release OopHandle
3076 _allocated->at(i).release(JvmtiExport::jvmti_oop_storage());
3077
3078 }
3079 delete _allocated, _allocated = nullptr;
3080 }
3081 }
3082
3083 void JvmtiObjectAllocEventCollector::record_allocation(oop obj) {
3084 assert(is_enabled(), "Object alloc event collector is not enabled");
3085 if (_allocated == nullptr) {
3086 _allocated = new (mtServiceability) GrowableArray<OopHandle>(1, mtServiceability);
3087 }
3088 _allocated->push(OopHandle(JvmtiExport::jvmti_oop_storage(), obj));
3089 }
3090
3091 // Disable collection of VMObjectAlloc events
3092 NoJvmtiVMObjectAllocMark::NoJvmtiVMObjectAllocMark() : _collector(nullptr) {
3093 // a no-op if VMObjectAlloc event is not enabled
3094 if (!JvmtiExport::should_post_vm_object_alloc()) {
3095 return;
3096 }
3097 Thread* thread = Thread::current_or_null();
3098 if (thread != nullptr && thread->is_Java_thread()) {
3099 JavaThread* current_thread = JavaThread::cast(thread);
3100 JvmtiThreadState *state = current_thread->jvmti_thread_state();
3101 if (state != nullptr) {
3102 JvmtiVMObjectAllocEventCollector *collector;
3103 collector = state->get_vm_object_alloc_event_collector();
3104 if (collector != nullptr && collector->is_enabled()) {
3105 _collector = collector;
3106 _collector->set_enabled(false);
3107 }
3108 }
3109 }
3110 }
3111
3112 // Re-Enable collection of VMObjectAlloc events (if previously enabled)
3113 NoJvmtiVMObjectAllocMark::~NoJvmtiVMObjectAllocMark() {
3114 if (was_enabled()) {
3115 _collector->set_enabled(true);
3116 }
3117 };
3118
3119 // Setup current thread to record vm allocated objects.
3120 JvmtiVMObjectAllocEventCollector::JvmtiVMObjectAllocEventCollector() {
3121 if (JvmtiExport::should_post_vm_object_alloc()) {
3122 _enable = true;
3123 setup_jvmti_thread_state();
3124 _post_callback = JvmtiExport::post_vm_object_alloc;
3125 }
3126 }
3127
3128 JvmtiVMObjectAllocEventCollector::~JvmtiVMObjectAllocEventCollector() {
3129 if (_enable) {
3130 generate_call_for_allocated();
3131 }
3132 unset_jvmti_thread_state();
3133 }
3134
3135 bool JvmtiSampledObjectAllocEventCollector::object_alloc_is_safe_to_sample() {
3136 Thread* thread = Thread::current();
3137 // Really only sample allocations if this is a JavaThread and not the compiler
3138 // thread.
3139 if (!thread->is_Java_thread() || thread->is_Compiler_thread()) {
3140 return false;
3141 }
3142
3143 // If the current thread is attaching from native and its Java thread object
3144 // is being allocated, things are not ready for allocation sampling.
3145 JavaThread* jt = JavaThread::cast(thread);
3146 if (jt->is_attaching_via_jni() && jt->threadObj() == nullptr) {
3147 return false;
3148 }
3149
3150 return true;
3151 }
3152
3153 // Setup current thread to record sampled allocated objects.
3154 void JvmtiSampledObjectAllocEventCollector::start() {
3155 if (JvmtiExport::should_post_sampled_object_alloc()) {
3156 if (!object_alloc_is_safe_to_sample()) {
3157 return;
3158 }
3159
3160 _enable = true;
3161 setup_jvmti_thread_state();
3162 _post_callback = JvmtiExport::post_sampled_object_alloc;
3163 }
3164 }
3165
3166 JvmtiSampledObjectAllocEventCollector::~JvmtiSampledObjectAllocEventCollector() {
3167 if (!_enable) {
3168 return;
3169 }
3170
3171 generate_call_for_allocated();
3172 unset_jvmti_thread_state();
3173
3174 // Unset the sampling collector as present in assertion mode only.
3175 assert(Thread::current()->is_Java_thread(),
3176 "Should always be in a Java thread");
3177 }
3178
3179 JvmtiGCMarker::JvmtiGCMarker() {
3180 // if there aren't any JVMTI environments then nothing to do
3181 if (!JvmtiEnv::environments_might_exist()) {
3182 return;
3183 }
3184
3185 if (JvmtiExport::should_post_garbage_collection_start()) {
3186 JvmtiExport::post_garbage_collection_start();
3187 }
3188
3189 if (SafepointSynchronize::is_at_safepoint()) {
3190 // Do clean up tasks that need to be done at a safepoint
3191 JvmtiEnvBase::check_for_periodic_clean_up();
3192 }
3193 }
3194
3195 JvmtiGCMarker::~JvmtiGCMarker() {
3196 // if there aren't any JVMTI environments then nothing to do
3197 if (!JvmtiEnv::environments_might_exist()) {
3198 return;
3199 }
3200
3201 // JVMTI notify gc finish
3202 if (JvmtiExport::should_post_garbage_collection_finish()) {
3203 JvmtiExport::post_garbage_collection_finish();
3204 }
3205 }