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 if (_thread->is_in_any_VTMS_transition()) {
933 return; // no events should be posted if thread is in any VTMS transition
934 }
935 _state = JvmtiExport::get_jvmti_thread_state(_thread);
936 if (_state != nullptr) {
937 _class_being_redefined = _state->get_class_being_redefined();
938 _load_kind = _state->get_class_load_kind();
939 Klass* klass = (_class_being_redefined == nullptr) ? nullptr : _class_being_redefined;
940 if (_load_kind != jvmti_class_load_kind_load && klass != nullptr) {
941 ModuleEntry* module_entry = InstanceKlass::cast(klass)->module();
942 assert(module_entry != nullptr, "module_entry should always be set");
943 if (module_entry->is_named() &&
944 module_entry->module() != nullptr &&
945 !module_entry->has_default_read_edges()) {
946 if (!module_entry->set_has_default_read_edges()) {
947 // We won a potential race.
948 // Add read edges to the unnamed modules of the bootstrap and app class loaders
949 Handle class_module(_thread, module_entry->module()); // Obtain j.l.r.Module
950 JvmtiExport::add_default_read_edges(class_module, _thread);
951 }
952 }
953 }
954 // Clear class_being_redefined flag here. The action
955 // from agent handler could generate a new class file load
956 // hook event and if it is not cleared the new event generated
957 // from regular class file load could have this stale redefined
958 // class handle info.
959 _state->clear_class_being_redefined();
960 } else {
961 // redefine and retransform will always set the thread state
962 _class_being_redefined = nullptr;
963 _load_kind = jvmti_class_load_kind_load;
964 }
965 }
966
967 void post() {
968 post_all_envs();
969 copy_modified_data();
970 }
971
972 bool has_been_modified() { return _has_been_modified; }
973
974 private:
975 void post_all_envs() {
976 if (_load_kind != jvmti_class_load_kind_retransform) {
977 // for class load and redefine,
978 // call the non-retransformable agents
979 JvmtiEnvIterator it;
980 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
981 if (!env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
982 // non-retransformable agents cannot retransform back,
983 // so no need to cache the original class file bytes
984 post_to_env(env, false);
985 }
986 }
987 }
988 JvmtiEnvIterator it;
989 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
990 // retransformable agents get all events
991 if (env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
992 // retransformable agents need to cache the original class file
993 // bytes if changes are made via the ClassFileLoadHook
994 post_to_env(env, true);
995 }
996 }
997 }
998
999 void post_to_env(JvmtiEnv* env, bool caching_needed) {
1000 if (env->phase() == JVMTI_PHASE_PRIMORDIAL && !env->early_class_hook_env()) {
1001 return;
1002 }
1003 unsigned char *new_data = nullptr;
1004 jint new_len = 0;
1005 JvmtiClassFileLoadEventMark jem(_thread, _h_name, _class_loader,
1006 _h_protection_domain,
1007 _class_being_redefined);
1008 JvmtiJavaThreadEventTransition jet(_thread);
1009 jvmtiEventClassFileLoadHook callback = env->callbacks()->ClassFileLoadHook;
1010 if (callback != nullptr) {
1011 (*callback)(env->jvmti_external(), jem.jni_env(),
1012 jem.class_being_redefined(),
1013 jem.jloader(), jem.class_name(),
1014 jem.protection_domain(),
1015 _curr_len, _curr_data,
1016 &new_len, &new_data);
1017 }
1018 if (new_data != nullptr) {
1019 // this agent has modified class data.
1020 _has_been_modified = true;
1021 if (caching_needed && *_cached_class_file_ptr == nullptr) {
1022 // data has been changed by the new retransformable agent
1023 // and it hasn't already been cached, cache it
1024 JvmtiCachedClassFileData *p;
1025 p = (JvmtiCachedClassFileData *)os::malloc(
1026 offset_of(JvmtiCachedClassFileData, data) + _curr_len, mtInternal);
1027 if (p == nullptr) {
1028 vm_exit_out_of_memory(offset_of(JvmtiCachedClassFileData, data) + _curr_len,
1029 OOM_MALLOC_ERROR,
1030 "unable to allocate cached copy of original class bytes");
1031 }
1032 p->length = _curr_len;
1033 memcpy(p->data, _curr_data, _curr_len);
1034 *_cached_class_file_ptr = p;
1035 }
1036
1037 if (_curr_data != *_data_ptr) {
1038 // curr_data is previous agent modified class data.
1039 // And this has been changed by the new agent so
1040 // we can delete it now.
1041 _curr_env->Deallocate(_curr_data);
1042 }
1043
1044 // Class file data has changed by the current agent.
1045 _curr_data = new_data;
1046 _curr_len = new_len;
1047 // Save the current agent env we need this to deallocate the
1048 // memory allocated by this agent.
1049 _curr_env = env;
1050 }
1051 }
1052
1053 void copy_modified_data() {
1054 // if one of the agent has modified class file data.
1055 // Copy modified class data to new resources array.
1056 if (_curr_data != *_data_ptr) {
1057 *_data_ptr = NEW_RESOURCE_ARRAY(u1, _curr_len);
1058 memcpy(*_data_ptr, _curr_data, _curr_len);
1059 *_end_ptr = *_data_ptr + _curr_len;
1060 _curr_env->Deallocate(_curr_data);
1061 }
1062 }
1063 };
1064
1065 bool JvmtiExport::is_early_phase() {
1066 return JvmtiEnvBase::get_phase() <= JVMTI_PHASE_PRIMORDIAL;
1067 }
1068
1069 bool JvmtiExport::has_early_class_hook_env() {
1070 JvmtiEnvIterator it;
1071 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1072 if (env->early_class_hook_env()) {
1073 return true;
1074 }
1075 }
1076 return false;
1077 }
1078
1079 bool JvmtiExport::has_early_vmstart_env() {
1080 JvmtiEnvIterator it;
1081 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1082 if (env->early_vmstart_env()) {
1083 return true;
1084 }
1085 }
1086 return false;
1087 }
1088
1089 bool JvmtiExport::_should_post_class_file_load_hook = false;
1090
1091 // This flag is read by C2 during VM internal objects allocation
1092 int JvmtiExport::_should_notify_object_alloc = 0;
1093
1094 // this entry is for class file load hook on class load, redefine and retransform
1095 bool JvmtiExport::post_class_file_load_hook(Symbol* h_name,
1096 Handle class_loader,
1097 Handle h_protection_domain,
1098 unsigned char **data_ptr,
1099 unsigned char **end_ptr,
1100 JvmtiCachedClassFileData **cache_ptr) {
1101 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1102 return false;
1103 }
1104 if (JavaThread::current()->is_in_tmp_VTMS_transition()) {
1105 return false; // skip CFLH events in tmp VTMS transition
1106 }
1107
1108 JvmtiClassFileLoadHookPoster poster(h_name, class_loader,
1109 h_protection_domain,
1110 data_ptr, end_ptr,
1111 cache_ptr);
1112 poster.post();
1113 return poster.has_been_modified();
1114 }
1115
1116 void JvmtiExport::report_unsupported(bool on) {
1117 // If any JVMTI service is turned on, we need to exit before native code
1118 // tries to access nonexistent services.
1119 if (on) {
1120 vm_exit_during_initialization("Java Kernel does not support JVMTI.");
1121 }
1122 }
1123
1124
1125 static inline Klass* oop_to_klass(oop obj) {
1126 Klass* k = obj->klass();
1127
1128 // if the object is a java.lang.Class then return the java mirror
1129 if (k == vmClasses::Class_klass()) {
1130 if (!java_lang_Class::is_primitive(obj)) {
1131 k = java_lang_Class::as_Klass(obj);
1132 assert(k != nullptr, "class for non-primitive mirror must exist");
1133 }
1134 }
1135 return k;
1136 }
1137
1138 class JvmtiObjectAllocEventMark : public JvmtiClassEventMark {
1139 private:
1140 jobject _jobj;
1141 jlong _size;
1142 public:
1143 JvmtiObjectAllocEventMark(JavaThread *thread, oop obj) : JvmtiClassEventMark(thread, oop_to_klass(obj)) {
1144 _jobj = (jobject)to_jobject(obj);
1145 _size = obj->size() * wordSize;
1146 };
1147 jobject jni_jobject() { return _jobj; }
1148 jlong size() { return _size; }
1149 };
1150
1151 class JvmtiCompiledMethodLoadEventMark : public JvmtiMethodEventMark {
1152 private:
1153 jint _code_size;
1154 const void *_code_data;
1155 jint _map_length;
1156 jvmtiAddrLocationMap *_map;
1157 const void *_compile_info;
1158 public:
1159 JvmtiCompiledMethodLoadEventMark(JavaThread *thread, nmethod *nm, void* compile_info_ptr = nullptr)
1160 : JvmtiMethodEventMark(thread,methodHandle(thread, nm->method())) {
1161 _code_data = nm->code_begin();
1162 _code_size = nm->code_size();
1163 _compile_info = compile_info_ptr; // Set void pointer of compiledMethodLoad Event. Default value is null.
1164 JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nm, &_map, &_map_length);
1165 }
1166 ~JvmtiCompiledMethodLoadEventMark() {
1167 FREE_C_HEAP_ARRAY(jvmtiAddrLocationMap, _map);
1168 }
1169
1170 jint code_size() { return _code_size; }
1171 const void *code_data() { return _code_data; }
1172 jint map_length() { return _map_length; }
1173 const jvmtiAddrLocationMap* map() { return _map; }
1174 const void *compile_info() { return _compile_info; }
1175 };
1176
1177
1178
1179 class JvmtiMonitorEventMark : public JvmtiVirtualThreadEventMark {
1180 private:
1181 jobject _jobj;
1182 public:
1183 JvmtiMonitorEventMark(JavaThread *thread, oop object)
1184 : JvmtiVirtualThreadEventMark(thread){
1185 _jobj = to_jobject(object);
1186 }
1187 jobject jni_object() { return _jobj; }
1188 };
1189
1190 ///////////////////////////////////////////////////////////////
1191 //
1192 // pending CompiledMethodUnload support
1193 //
1194
1195 void JvmtiExport::post_compiled_method_unload(
1196 jmethodID method, const void *code_begin) {
1197 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1198 return;
1199 }
1200 JavaThread* thread = JavaThread::current();
1201 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
1202 ("[%s] method compile unload event triggered",
1203 JvmtiTrace::safe_get_thread_name(thread)));
1204
1205 // post the event for each environment that has this event enabled.
1206 JvmtiEnvIterator it;
1207 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1208 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_UNLOAD)) {
1209 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1210 continue;
1211 }
1212 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
1213 ("[%s] class compile method unload event sent jmethodID " PTR_FORMAT,
1214 JvmtiTrace::safe_get_thread_name(thread), p2i(method)));
1215
1216 ResourceMark rm(thread);
1217
1218 JvmtiEventMark jem(thread);
1219 JvmtiJavaThreadEventTransition jet(thread);
1220 jvmtiEventCompiledMethodUnload callback = env->callbacks()->CompiledMethodUnload;
1221 if (callback != nullptr) {
1222 (*callback)(env->jvmti_external(), method, code_begin);
1223 }
1224 }
1225 }
1226 }
1227
1228 ///////////////////////////////////////////////////////////////
1229 //
1230 // JvmtiExport
1231 //
1232
1233 void JvmtiExport::post_raw_breakpoint(JavaThread *thread, Method* method, address location) {
1234 HandleMark hm(thread);
1235 methodHandle mh(thread, method);
1236
1237 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1238 if (state == nullptr) {
1239 return;
1240 }
1241 if (thread->is_in_any_VTMS_transition()) {
1242 return; // no events should be posted if thread is in any VTMS transition
1243 }
1244
1245 EVT_TRIG_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Trg Breakpoint triggered",
1246 JvmtiTrace::safe_get_thread_name(thread)));
1247 JvmtiEnvThreadStateIterator it(state);
1248 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1249 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_BREAKPOINT);
1250 if (!ets->breakpoint_posted() && ets->is_enabled(JVMTI_EVENT_BREAKPOINT)) {
1251 ThreadState old_os_state = thread->osthread()->get_state();
1252 thread->osthread()->set_state(BREAKPOINTED);
1253 EVT_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Evt Breakpoint sent %s.%s @ " INTX_FORMAT,
1254 JvmtiTrace::safe_get_thread_name(thread),
1255 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1256 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
1257 location - mh()->code_base() ));
1258
1259 JvmtiEnv *env = ets->get_env();
1260 JvmtiLocationEventMark jem(thread, mh, location);
1261 JvmtiJavaThreadEventTransition jet(thread);
1262 jvmtiEventBreakpoint callback = env->callbacks()->Breakpoint;
1263 if (callback != nullptr) {
1264 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1265 jem.jni_methodID(), jem.location());
1266 }
1267
1268 ets->set_breakpoint_posted();
1269 thread->osthread()->set_state(old_os_state);
1270 }
1271 }
1272 }
1273
1274 //////////////////////////////////////////////////////////////////////////////
1275
1276 bool JvmtiExport::_can_get_source_debug_extension = false;
1277 bool JvmtiExport::_can_maintain_original_method_order = false;
1278 bool JvmtiExport::_can_post_interpreter_events = false;
1279 bool JvmtiExport::_can_post_on_exceptions = false;
1280 bool JvmtiExport::_can_post_breakpoint = false;
1281 bool JvmtiExport::_can_post_field_access = false;
1282 bool JvmtiExport::_can_post_field_modification = false;
1283 bool JvmtiExport::_can_post_method_entry = false;
1284 bool JvmtiExport::_can_post_method_exit = false;
1285 bool JvmtiExport::_can_post_frame_pop = false;
1286 bool JvmtiExport::_can_pop_frame = false;
1287 bool JvmtiExport::_can_force_early_return = false;
1288 bool JvmtiExport::_can_support_virtual_threads = false;
1289 bool JvmtiExport::_can_get_owned_monitor_info = false;
1290
1291 bool JvmtiExport::_early_vmstart_recorded = false;
1292
1293 bool JvmtiExport::_should_post_single_step = false;
1294 bool JvmtiExport::_should_post_field_access = false;
1295 bool JvmtiExport::_should_post_field_modification = false;
1296 bool JvmtiExport::_should_post_class_load = false;
1297 bool JvmtiExport::_should_post_class_prepare = false;
1298 bool JvmtiExport::_should_post_class_unload = false;
1299 bool JvmtiExport::_should_post_thread_life = false;
1300 bool JvmtiExport::_should_clean_up_heap_objects = false;
1301 bool JvmtiExport::_should_post_native_method_bind = false;
1302 bool JvmtiExport::_should_post_dynamic_code_generated = false;
1303 bool JvmtiExport::_should_post_data_dump = false;
1304 bool JvmtiExport::_should_post_compiled_method_load = false;
1305 bool JvmtiExport::_should_post_compiled_method_unload = false;
1306 bool JvmtiExport::_should_post_monitor_contended_enter = false;
1307 bool JvmtiExport::_should_post_monitor_contended_entered = false;
1308 bool JvmtiExport::_should_post_monitor_wait = false;
1309 bool JvmtiExport::_should_post_monitor_waited = false;
1310 bool JvmtiExport::_should_post_garbage_collection_start = false;
1311 bool JvmtiExport::_should_post_garbage_collection_finish = false;
1312 bool JvmtiExport::_should_post_object_free = false;
1313 bool JvmtiExport::_should_post_resource_exhausted = false;
1314 bool JvmtiExport::_should_post_vm_object_alloc = false;
1315 bool JvmtiExport::_should_post_sampled_object_alloc = false;
1316 bool JvmtiExport::_should_post_on_exceptions = false;
1317 bool JvmtiExport::_should_post_vthread_start = false;
1318 bool JvmtiExport::_should_post_vthread_end = false;
1319 bool JvmtiExport::_should_post_vthread_mount = false;
1320 bool JvmtiExport::_should_post_vthread_unmount = false;
1321
1322 ////////////////////////////////////////////////////////////////////////////////////////////////
1323
1324
1325 //
1326 // JVMTI single step management
1327 //
1328 void JvmtiExport::at_single_stepping_point(JavaThread *thread, Method* method, address location) {
1329 assert(JvmtiExport::should_post_single_step(), "must be single stepping");
1330
1331 HandleMark hm(thread);
1332 methodHandle mh(thread, method);
1333
1334 // update information about current location and post a step event
1335 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1336 if (state == nullptr) {
1337 return;
1338 }
1339 EVT_TRIG_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Trg Single Step triggered",
1340 JvmtiTrace::safe_get_thread_name(thread)));
1341 if (!state->hide_single_stepping()) {
1342 if (state->is_pending_step_for_popframe()) {
1343 state->process_pending_step_for_popframe();
1344 }
1345 if (state->is_pending_step_for_earlyret()) {
1346 state->process_pending_step_for_earlyret();
1347 }
1348 JvmtiExport::post_single_step(thread, mh(), location);
1349 }
1350 }
1351
1352
1353 void JvmtiExport::expose_single_stepping(JavaThread *thread) {
1354 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1355 if (state != nullptr) {
1356 state->clear_hide_single_stepping();
1357 }
1358 }
1359
1360
1361 bool JvmtiExport::hide_single_stepping(JavaThread *thread) {
1362 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1363 if (state != nullptr && state->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1364 state->set_hide_single_stepping();
1365 return true;
1366 } else {
1367 return false;
1368 }
1369 }
1370
1371 void JvmtiExport::post_class_load(JavaThread *thread, Klass* klass) {
1372 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1373 return;
1374 }
1375 HandleMark hm(thread);
1376
1377 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1378 if (state == nullptr) {
1379 return;
1380 }
1381 if (thread->is_in_any_VTMS_transition()) {
1382 return; // no events should be posted if thread is in any VTMS transition
1383 }
1384
1385 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Trg Class Load triggered",
1386 JvmtiTrace::safe_get_thread_name(thread)));
1387 JvmtiEnvThreadStateIterator it(state);
1388 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1389 if (ets->is_enabled(JVMTI_EVENT_CLASS_LOAD)) {
1390 JvmtiEnv *env = ets->get_env();
1391 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1392 continue;
1393 }
1394 EVT_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Evt Class Load sent %s",
1395 JvmtiTrace::safe_get_thread_name(thread),
1396 klass==nullptr? "null" : klass->external_name() ));
1397 JvmtiClassEventMark jem(thread, klass);
1398 JvmtiJavaThreadEventTransition jet(thread);
1399 jvmtiEventClassLoad callback = env->callbacks()->ClassLoad;
1400 if (callback != nullptr) {
1401 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1402 }
1403 }
1404 }
1405 }
1406
1407
1408 void JvmtiExport::post_class_prepare(JavaThread *thread, Klass* klass) {
1409 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1410 return;
1411 }
1412 HandleMark hm(thread);
1413
1414 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1415 if (state == nullptr) {
1416 return;
1417 }
1418 if (thread->is_in_any_VTMS_transition()) {
1419 return; // no events should be posted if thread is in any VTMS transition
1420 }
1421
1422 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Trg Class Prepare triggered",
1423 JvmtiTrace::safe_get_thread_name(thread)));
1424 JvmtiEnvThreadStateIterator it(state);
1425 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1426 if (ets->is_enabled(JVMTI_EVENT_CLASS_PREPARE)) {
1427 JvmtiEnv *env = ets->get_env();
1428 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1429 continue;
1430 }
1431 EVT_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Evt Class Prepare sent %s",
1432 JvmtiTrace::safe_get_thread_name(thread),
1433 klass==nullptr? "null" : klass->external_name() ));
1434 JvmtiClassEventMark jem(thread, klass);
1435 JvmtiJavaThreadEventTransition jet(thread);
1436 jvmtiEventClassPrepare callback = env->callbacks()->ClassPrepare;
1437 if (callback != nullptr) {
1438 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1439 }
1440 }
1441 }
1442 }
1443
1444 void JvmtiExport::post_class_unload(Klass* klass) {
1445 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1446 return;
1447 }
1448
1449 // postings to the service thread so that it can perform them in a safe
1450 // context and in-order.
1451 ResourceMark rm;
1452 // JvmtiDeferredEvent copies the string.
1453 JvmtiDeferredEvent event = JvmtiDeferredEvent::class_unload_event(klass->name()->as_C_string());
1454 ServiceThread::enqueue_deferred_event(&event);
1455 }
1456
1457
1458 void JvmtiExport::post_class_unload_internal(const char* name) {
1459 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1460 return;
1461 }
1462 assert(Thread::current()->is_service_thread(), "must be called from ServiceThread");
1463 JavaThread *thread = JavaThread::current();
1464 HandleMark hm(thread);
1465
1466 EVT_TRIG_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Trg Class Unload triggered" ));
1467 if (JvmtiEventController::is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1468
1469 JvmtiEnvIterator it;
1470 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1471 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1472 continue;
1473 }
1474 if (env->is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1475 EVT_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Evt Class Unload sent %s", name));
1476
1477 JvmtiEventMark jem(thread);
1478 JvmtiJavaThreadEventTransition jet(thread);
1479 jvmtiExtensionEvent callback = env->ext_callbacks()->ClassUnload;
1480 if (callback != nullptr) {
1481 (*callback)(env->jvmti_external(), jem.jni_env(), name);
1482 }
1483 }
1484 }
1485 }
1486 }
1487
1488
1489 void JvmtiExport::post_thread_start(JavaThread *thread) {
1490 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1491 return;
1492 }
1493 assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
1494
1495 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Trg Thread Start event triggered",
1496 JvmtiTrace::safe_get_thread_name(thread)));
1497
1498 // do JVMTI thread initialization (if needed)
1499 JvmtiEventController::thread_started(thread);
1500
1501 if (thread->threadObj()->is_a(vmClasses::BoundVirtualThread_klass())) {
1502 if (JvmtiExport::can_support_virtual_threads()) {
1503 // Check for VirtualThreadStart event instead.
1504 HandleMark hm(thread);
1505 Handle vthread(thread, thread->threadObj());
1506 JvmtiExport::post_vthread_start((jthread)vthread.raw_value());
1507 }
1508 return;
1509 }
1510
1511 // Do not post thread start event for hidden java thread.
1512 if (JvmtiEventController::is_enabled(JVMTI_EVENT_THREAD_START) &&
1513 !thread->is_hidden_from_external_view()) {
1514 JvmtiEnvIterator it;
1515 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1516 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1517 continue;
1518 }
1519 if (env->is_enabled(JVMTI_EVENT_THREAD_START)) {
1520 EVT_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Evt Thread Start event sent",
1521 JvmtiTrace::safe_get_thread_name(thread) ));
1522
1523 JvmtiVirtualThreadEventMark jem(thread);
1524 JvmtiJavaThreadEventTransition jet(thread);
1525 jvmtiEventThreadStart callback = env->callbacks()->ThreadStart;
1526 if (callback != nullptr) {
1527 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1528 }
1529 }
1530 }
1531 }
1532 }
1533
1534
1535 void JvmtiExport::post_thread_end(JavaThread *thread) {
1536 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1537 return;
1538 }
1539 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Trg Thread End event triggered",
1540 JvmtiTrace::safe_get_thread_name(thread)));
1541
1542 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1543 if (state == nullptr) {
1544 return;
1545 }
1546
1547 if (thread->threadObj()->is_a(vmClasses::BoundVirtualThread_klass())) {
1548 if (JvmtiExport::can_support_virtual_threads()) {
1549 // Check for VirtualThreadEnd event instead.
1550 HandleMark hm(thread);
1551 Handle vthread(thread, thread->threadObj());
1552 JvmtiExport::post_vthread_end((jthread)vthread.raw_value());
1553 }
1554 return;
1555 }
1556
1557 // Do not post thread end event for hidden java thread.
1558 if (state->is_enabled(JVMTI_EVENT_THREAD_END) &&
1559 !thread->is_hidden_from_external_view()) {
1560
1561 JvmtiEnvThreadStateIterator it(state);
1562 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1563 JvmtiEnv *env = ets->get_env();
1564 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1565 continue;
1566 }
1567 if (ets->is_enabled(JVMTI_EVENT_THREAD_END)) {
1568 EVT_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Evt Thread End event sent",
1569 JvmtiTrace::safe_get_thread_name(thread) ));
1570
1571 JvmtiVirtualThreadEventMark jem(thread);
1572 JvmtiJavaThreadEventTransition jet(thread);
1573 jvmtiEventThreadEnd callback = env->callbacks()->ThreadEnd;
1574 if (callback != nullptr) {
1575 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1576 }
1577 }
1578 }
1579 }
1580 }
1581
1582
1583 void JvmtiExport::post_vthread_start(jobject vthread) {
1584 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1585 return;
1586 }
1587 EVT_TRIG_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_START, ("[%p] Trg Virtual Thread Start event triggered", vthread));
1588
1589 JavaThread *thread = JavaThread::current();
1590 assert(!thread->is_hidden_from_external_view(), "carrier threads can't be hidden");
1591
1592 if (JvmtiEventController::is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_START)) {
1593 JvmtiEnvIterator it;
1594 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1595 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1596 continue;
1597 }
1598 if (env->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_START)) {
1599 EVT_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_START, ("[%p] Evt Virtual Thread Start event sent", vthread));
1600
1601 JvmtiVirtualThreadEventMark jem(thread);
1602 JvmtiJavaThreadEventTransition jet(thread);
1603 jvmtiEventVirtualThreadStart callback = env->callbacks()->VirtualThreadStart;
1604 if (callback != nullptr) {
1605 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1606 }
1607 }
1608 }
1609 }
1610 }
1611
1612 void JvmtiExport::post_vthread_end(jobject vthread) {
1613 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1614 return;
1615 }
1616 EVT_TRIG_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_END, ("[%p] Trg Virtual Thread End event triggered", vthread));
1617
1618 JavaThread *thread = JavaThread::current();
1619 assert(!thread->is_hidden_from_external_view(), "carrier threads can't be hidden");
1620
1621 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1622 if (state == nullptr) {
1623 return;
1624 }
1625
1626 if (state->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_END)) {
1627 JvmtiEnvThreadStateIterator it(state);
1628
1629 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1630 JvmtiEnv *env = ets->get_env();
1631 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1632 continue;
1633 }
1634 if (ets->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_END)) {
1635 EVT_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_END, ("[%p] Evt Virtual Thread End event sent", vthread));
1636
1637 JvmtiVirtualThreadEventMark jem(thread);
1638 JvmtiJavaThreadEventTransition jet(thread);
1639 jvmtiEventVirtualThreadEnd callback = env->callbacks()->VirtualThreadEnd;
1640 if (callback != nullptr) {
1641 (*callback)(env->jvmti_external(), jem.jni_env(), vthread);
1642 }
1643 }
1644 }
1645 }
1646 }
1647
1648 void JvmtiExport::post_vthread_mount(jobject vthread) {
1649 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1650 return;
1651 }
1652 JavaThread *thread = JavaThread::current();
1653 HandleMark hm(thread);
1654 EVT_TRIG_TRACE(EXT_EVENT_VIRTUAL_THREAD_MOUNT, ("[%p] Trg Virtual Thread Mount event triggered", vthread));
1655
1656 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1657 if (state == nullptr) {
1658 return;
1659 }
1660
1661 if (state->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_MOUNT)) {
1662 JvmtiEnvThreadStateIterator it(state);
1663
1664 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1665 JvmtiEnv *env = ets->get_env();
1666 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1667 continue;
1668 }
1669 if (ets->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_MOUNT)) {
1670 EVT_TRACE(EXT_EVENT_VIRTUAL_THREAD_MOUNT, ("[%p] Evt Virtual Thread Mount event sent", vthread));
1671
1672 JvmtiVirtualThreadEventMark jem(thread);
1673 JvmtiJavaThreadEventTransition jet(thread);
1674 jvmtiExtensionEvent callback = env->ext_callbacks()->VirtualThreadMount;
1675 if (callback != nullptr) {
1676 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1677 }
1678 }
1679 }
1680 }
1681 }
1682
1683 void JvmtiExport::post_vthread_unmount(jobject vthread) {
1684 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1685 return;
1686 }
1687 JavaThread *thread = JavaThread::current();
1688 HandleMark hm(thread);
1689 EVT_TRIG_TRACE(EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, ("[%p] Trg Virtual Thread Unmount event triggered", vthread));
1690
1691 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1692 if (state == nullptr) {
1693 return;
1694 }
1695
1696 if (state->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_UNMOUNT)) {
1697 JvmtiEnvThreadStateIterator it(state);
1698
1699 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1700 JvmtiEnv *env = ets->get_env();
1701 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1702 continue;
1703 }
1704 if (ets->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_UNMOUNT)) {
1705 EVT_TRACE(EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, ("[%p] Evt Virtual Thread Unmount event sent", vthread));
1706
1707 JvmtiVirtualThreadEventMark jem(thread);
1708 JvmtiJavaThreadEventTransition jet(thread);
1709 jvmtiExtensionEvent callback = env->ext_callbacks()->VirtualThreadUnmount;
1710 if (callback != nullptr) {
1711 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1712 }
1713 }
1714 }
1715 }
1716 }
1717
1718 void JvmtiExport::continuation_yield_cleanup(JavaThread* thread, jint continuation_frame_count) {
1719 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1720 return;
1721 }
1722
1723 assert(thread == JavaThread::current(), "must be");
1724 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1725 if (state == nullptr) {
1726 return;
1727 }
1728 state->invalidate_cur_stack_depth();
1729
1730 // Clear frame_pop requests in frames popped by yield
1731 if (can_post_frame_pop()) {
1732 JvmtiEnvThreadStateIterator it(state);
1733 int top_frame_num = state->cur_stack_depth() + continuation_frame_count;
1734
1735 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1736 if (!ets->has_frame_pops()) {
1737 continue;
1738 }
1739 for (int frame_idx = 0; frame_idx < continuation_frame_count; frame_idx++) {
1740 int frame_num = top_frame_num - frame_idx;
1741
1742 if (!state->is_virtual() && ets->is_frame_pop(frame_num)) {
1743 // remove the frame's entry
1744 MutexLocker mu(JvmtiThreadState_lock);
1745 ets->clear_frame_pop(frame_num);
1746 }
1747 }
1748 }
1749 }
1750 }
1751
1752 void JvmtiExport::post_object_free(JvmtiEnv* env, GrowableArray<jlong>* objects) {
1753 assert(objects != nullptr, "Nothing to post");
1754
1755 JavaThread *javaThread = JavaThread::current();
1756 if (javaThread->is_in_any_VTMS_transition()) {
1757 return; // no events should be posted if thread is in any VTMS transition
1758 }
1759 if (!env->is_enabled(JVMTI_EVENT_OBJECT_FREE)) {
1760 return; // the event type has been already disabled
1761 }
1762
1763 EVT_TRIG_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Trg Object Free triggered" ));
1764 EVT_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Evt Object Free sent"));
1765
1766 JvmtiThreadEventMark jem(javaThread);
1767 JvmtiJavaThreadEventTransition jet(javaThread);
1768 jvmtiEventObjectFree callback = env->callbacks()->ObjectFree;
1769 if (callback != nullptr) {
1770 for (int index = 0; index < objects->length(); index++) {
1771 (*callback)(env->jvmti_external(), objects->at(index));
1772 }
1773 }
1774 }
1775
1776 void JvmtiExport::post_resource_exhausted(jint resource_exhausted_flags, const char* description) {
1777
1778 JavaThread *thread = JavaThread::current();
1779
1780 if (thread->is_in_any_VTMS_transition()) {
1781 return; // no events should be posted if thread is in any VTMS transition
1782 }
1783
1784 log_error(jvmti)("Posting Resource Exhausted event: %s",
1785 description != nullptr ? description : "unknown");
1786
1787 // JDK-8213834: handlers of ResourceExhausted may attempt some analysis
1788 // which often requires running java.
1789 // This will cause problems on threads not able to run java, e.g. compiler
1790 // threads. To forestall these problems, we therefore suppress sending this
1791 // event from threads which are not able to run java.
1792 if (!thread->can_call_java()) {
1793 return;
1794 }
1795
1796 EVT_TRIG_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Trg resource exhausted event triggered" ));
1797
1798 JvmtiEnvIterator it;
1799 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1800 if (env->is_enabled(JVMTI_EVENT_RESOURCE_EXHAUSTED)) {
1801 EVT_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Evt resource exhausted event sent" ));
1802
1803 JvmtiThreadEventMark jem(thread);
1804 JvmtiJavaThreadEventTransition jet(thread);
1805 jvmtiEventResourceExhausted callback = env->callbacks()->ResourceExhausted;
1806 if (callback != nullptr) {
1807 (*callback)(env->jvmti_external(), jem.jni_env(),
1808 resource_exhausted_flags, nullptr, description);
1809 }
1810 }
1811 }
1812 }
1813
1814 void JvmtiExport::post_method_entry(JavaThread *thread, Method* method, frame current_frame) {
1815 HandleMark hm(thread);
1816 methodHandle mh(thread, method);
1817
1818 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1819 if (state == nullptr || !state->is_interp_only_mode()) {
1820 // for any thread that actually wants method entry, interp_only_mode is set
1821 return;
1822 }
1823 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1824 return; // no events should be posted if thread is in any VTMS transition
1825 }
1826 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Trg Method Entry triggered %s.%s",
1827 JvmtiTrace::safe_get_thread_name(thread),
1828 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1829 (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1830
1831 state->incr_cur_stack_depth();
1832
1833 if (state->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1834 JvmtiEnvThreadStateIterator it(state);
1835 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1836 if (ets->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1837 EVT_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Evt Method Entry sent %s.%s",
1838 JvmtiTrace::safe_get_thread_name(thread),
1839 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1840 (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1841
1842 JvmtiEnv *env = ets->get_env();
1843 JvmtiMethodEventMark jem(thread, mh);
1844 JvmtiJavaThreadEventTransition jet(thread);
1845 jvmtiEventMethodEntry callback = env->callbacks()->MethodEntry;
1846 if (callback != nullptr) {
1847 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_methodID());
1848 }
1849 }
1850 }
1851 }
1852 }
1853
1854 void JvmtiExport::post_method_exit(JavaThread* thread, Method* method, frame current_frame) {
1855 HandleMark hm(thread);
1856 methodHandle mh(thread, method);
1857
1858 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1859
1860 if (state == nullptr || !state->is_interp_only_mode()) {
1861 // for any thread that actually wants method exit, interp_only_mode is set
1862 return;
1863 }
1864
1865 // return a flag when a method terminates by throwing an exception
1866 // i.e. if an exception is thrown and it's not caught by the current method
1867 bool exception_exit = state->is_exception_detected() && !state->is_exception_caught();
1868 Handle result;
1869 jvalue value;
1870 value.j = 0L;
1871
1872 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1873 // if the method hasn't been popped because of an exception then we populate
1874 // the return_value parameter for the callback. At this point we only have
1875 // the address of a "raw result" and we just call into the interpreter to
1876 // convert this into a jvalue.
1877 if (!exception_exit) {
1878 oop oop_result;
1879 BasicType type = current_frame.interpreter_frame_result(&oop_result, &value);
1880 if (is_reference_type(type)) {
1881 result = Handle(thread, oop_result);
1882 value.l = JNIHandles::make_local(thread, result());
1883 }
1884 }
1885 }
1886
1887 // Deferred transition to VM, so we can stash away the return oop before GC
1888 // Note that this transition is not needed when throwing an exception, because
1889 // there is no oop to retain.
1890 JavaThread* current = thread; // for JRT_BLOCK
1891 JRT_BLOCK
1892 post_method_exit_inner(thread, mh, state, exception_exit, current_frame, value);
1893 JRT_BLOCK_END
1894
1895 if (result.not_null() && !mh->is_native()) {
1896 // We have to restore the oop on the stack for interpreter frames
1897 *(oop*)current_frame.interpreter_frame_tos_address() = result();
1898 }
1899 }
1900
1901 void JvmtiExport::post_method_exit_inner(JavaThread* thread,
1902 methodHandle& mh,
1903 JvmtiThreadState *state,
1904 bool exception_exit,
1905 frame current_frame,
1906 jvalue& value) {
1907 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1908 return; // no events should be posted if thread is in any VTMS transition
1909 }
1910
1911 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Trg Method Exit triggered %s.%s",
1912 JvmtiTrace::safe_get_thread_name(thread),
1913 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1914 (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1915
1916 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1917 JvmtiEnvThreadStateIterator it(state);
1918 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1919 if (ets->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1920 EVT_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Evt Method Exit sent %s.%s",
1921 JvmtiTrace::safe_get_thread_name(thread),
1922 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1923 (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1924
1925 JvmtiEnv *env = ets->get_env();
1926 JvmtiMethodEventMark jem(thread, mh);
1927 JvmtiJavaThreadEventTransition jet(thread);
1928 jvmtiEventMethodExit callback = env->callbacks()->MethodExit;
1929 if (callback != nullptr) {
1930 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1931 jem.jni_methodID(), exception_exit, value);
1932 }
1933 }
1934 }
1935 }
1936
1937 JvmtiEnvThreadStateIterator it(state);
1938 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1939 if (ets->has_frame_pops()) {
1940 int cur_frame_number = state->cur_stack_depth();
1941
1942 if (ets->is_frame_pop(cur_frame_number)) {
1943 // we have a NotifyFramePop entry for this frame.
1944 // now check that this env/thread wants this event
1945 if (ets->is_enabled(JVMTI_EVENT_FRAME_POP)) {
1946 EVT_TRACE(JVMTI_EVENT_FRAME_POP, ("[%s] Evt Frame Pop sent %s.%s",
1947 JvmtiTrace::safe_get_thread_name(thread),
1948 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1949 (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1950
1951 // we also need to issue a frame pop event for this frame
1952 JvmtiEnv *env = ets->get_env();
1953 JvmtiMethodEventMark jem(thread, mh);
1954 JvmtiJavaThreadEventTransition jet(thread);
1955 jvmtiEventFramePop callback = env->callbacks()->FramePop;
1956 if (callback != nullptr) {
1957 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1958 jem.jni_methodID(), exception_exit);
1959 }
1960 }
1961 // remove the frame's entry
1962 {
1963 MutexLocker mu(JvmtiThreadState_lock);
1964 ets->clear_frame_pop(cur_frame_number);
1965 }
1966 }
1967 }
1968 }
1969
1970 state->decr_cur_stack_depth();
1971 }
1972
1973
1974 // Todo: inline this for optimization
1975 void JvmtiExport::post_single_step(JavaThread *thread, Method* method, address location) {
1976 HandleMark hm(thread);
1977 methodHandle mh(thread, method);
1978
1979 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1980 if (state == nullptr) {
1981 return;
1982 }
1983 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1984 return; // no events should be posted if thread is in any VTMS transition
1985 }
1986
1987 JvmtiEnvThreadStateIterator it(state);
1988 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1989 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_SINGLE_STEP);
1990 if (!ets->single_stepping_posted() && ets->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1991 EVT_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Evt Single Step sent %s.%s @ " INTX_FORMAT,
1992 JvmtiTrace::safe_get_thread_name(thread),
1993 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1994 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
1995 location - mh()->code_base() ));
1996
1997 JvmtiEnv *env = ets->get_env();
1998 JvmtiLocationEventMark jem(thread, mh, location);
1999 JvmtiJavaThreadEventTransition jet(thread);
2000 jvmtiEventSingleStep callback = env->callbacks()->SingleStep;
2001 if (callback != nullptr) {
2002 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2003 jem.jni_methodID(), jem.location());
2004 }
2005
2006 ets->set_single_stepping_posted();
2007 }
2008 }
2009 }
2010
2011 void JvmtiExport::post_exception_throw(JavaThread *thread, Method* method, address location, oop exception) {
2012 HandleMark hm(thread);
2013 methodHandle mh(thread, method);
2014 Handle exception_handle(thread, exception);
2015 // The KeepStackGCProcessedMark below keeps the target thread and its stack fully
2016 // GC processed across this scope. This is needed because there is a stack walk
2017 // below with safepoint polls inside of it. After such safepoints, we have to
2018 // ensure the stack is sufficiently processed.
2019 KeepStackGCProcessedMark ksgcpm(thread);
2020
2021 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2022 if (state == nullptr) {
2023 return;
2024 }
2025 if (thread->is_in_any_VTMS_transition()) {
2026 return; // no events should be posted if thread is in any VTMS transition
2027 }
2028
2029 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION, ("[%s] Trg Exception thrown triggered",
2030 JvmtiTrace::safe_get_thread_name(thread)));
2031 if (!state->is_exception_detected()) {
2032 state->set_exception_detected();
2033 JvmtiEnvThreadStateIterator it(state);
2034 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2035 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION) && (exception != nullptr)) {
2036
2037 EVT_TRACE(JVMTI_EVENT_EXCEPTION,
2038 ("[%s] Evt Exception thrown sent %s.%s @ " INTX_FORMAT,
2039 JvmtiTrace::safe_get_thread_name(thread),
2040 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2041 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2042 location - mh()->code_base() ));
2043
2044 JvmtiEnv *env = ets->get_env();
2045 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
2046
2047 // It's okay to clear these exceptions here because we duplicate
2048 // this lookup in InterpreterRuntime::exception_handler_for_exception.
2049 EXCEPTION_MARK;
2050
2051 bool should_repeat;
2052 vframeStream st(thread);
2053 assert(!st.at_end(), "cannot be at end");
2054 Method* current_method = nullptr;
2055 // A GC may occur during the Method::fast_exception_handler_bci_for()
2056 // call below if it needs to load the constraint class. Using a
2057 // methodHandle to keep the 'current_method' from being deallocated
2058 // if GC happens.
2059 methodHandle current_mh = methodHandle(thread, current_method);
2060 int current_bci = -1;
2061 do {
2062 current_method = st.method();
2063 current_mh = methodHandle(thread, current_method);
2064 current_bci = st.bci();
2065 do {
2066 should_repeat = false;
2067 Klass* eh_klass = exception_handle()->klass();
2068 current_bci = Method::fast_exception_handler_bci_for(
2069 current_mh, eh_klass, current_bci, THREAD);
2070 if (HAS_PENDING_EXCEPTION) {
2071 exception_handle = Handle(thread, PENDING_EXCEPTION);
2072 CLEAR_PENDING_EXCEPTION;
2073 should_repeat = true;
2074 }
2075 } while (should_repeat && (current_bci != -1));
2076 st.next();
2077 } while ((current_bci < 0) && (!st.at_end()));
2078
2079 jmethodID catch_jmethodID;
2080 if (current_bci < 0) {
2081 catch_jmethodID = 0;
2082 current_bci = 0;
2083 } else {
2084 catch_jmethodID = jem.to_jmethodID(current_mh);
2085 }
2086
2087 JvmtiJavaThreadEventTransition jet(thread);
2088 jvmtiEventException callback = env->callbacks()->Exception;
2089 if (callback != nullptr) {
2090 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2091 jem.jni_methodID(), jem.location(),
2092 jem.exception(),
2093 catch_jmethodID, current_bci);
2094 }
2095 }
2096 }
2097 }
2098
2099 // frames may get popped because of this throw, be safe - invalidate cached depth
2100 state->invalidate_cur_stack_depth();
2101 }
2102
2103
2104 void JvmtiExport::notice_unwind_due_to_exception(JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) {
2105 HandleMark hm(thread);
2106 methodHandle mh(thread, method);
2107 Handle exception_handle(thread, exception);
2108
2109 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2110 if (state == nullptr) {
2111 return;
2112 }
2113 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
2114 ("[%s] Trg unwind_due_to_exception triggered %s.%s @ %s" INTX_FORMAT " - %s",
2115 JvmtiTrace::safe_get_thread_name(thread),
2116 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2117 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2118 location==0? "no location:" : "",
2119 location==0? 0 : location - mh()->code_base(),
2120 in_handler_frame? "in handler frame" : "not handler frame" ));
2121
2122 if (state->is_exception_detected()) {
2123
2124 state->invalidate_cur_stack_depth();
2125 if (!in_handler_frame) {
2126 // Not in exception handler.
2127 if(state->is_interp_only_mode()) {
2128 // method exit and frame pop events are posted only in interp mode.
2129 // When these events are enabled code should be in running in interp mode.
2130 jvalue no_value;
2131 no_value.j = 0L;
2132 JvmtiExport::post_method_exit_inner(thread, mh, state, true, thread->last_frame(), no_value);
2133 // The cached cur_stack_depth might have changed from the
2134 // operations of frame pop or method exit. We are not 100% sure
2135 // the cached cur_stack_depth is still valid depth so invalidate
2136 // it.
2137 state->invalidate_cur_stack_depth();
2138 }
2139 } else {
2140 // In exception handler frame. Report exception catch.
2141 assert(location != nullptr, "must be a known location");
2142 // Update cur_stack_depth - the frames above the current frame
2143 // have been unwound due to this exception:
2144 assert(!state->is_exception_caught(), "exception must not be caught yet.");
2145 state->set_exception_caught();
2146
2147 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
2148 return; // no events should be posted if thread is in any VTMS transition
2149 }
2150 JvmtiEnvThreadStateIterator it(state);
2151 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2152 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION_CATCH) && (exception_handle() != nullptr)) {
2153 EVT_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
2154 ("[%s] Evt ExceptionCatch sent %s.%s @ " INTX_FORMAT,
2155 JvmtiTrace::safe_get_thread_name(thread),
2156 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2157 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2158 location - mh()->code_base() ));
2159
2160 JvmtiEnv *env = ets->get_env();
2161 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
2162 JvmtiJavaThreadEventTransition jet(thread);
2163 jvmtiEventExceptionCatch callback = env->callbacks()->ExceptionCatch;
2164 if (callback != nullptr) {
2165 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2166 jem.jni_methodID(), jem.location(),
2167 jem.exception());
2168 }
2169 }
2170 }
2171 }
2172 }
2173 }
2174
2175 oop JvmtiExport::jni_GetField_probe(JavaThread *thread, jobject jobj, oop obj,
2176 Klass* klass, jfieldID fieldID, bool is_static) {
2177 if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) {
2178 // At least one field access watch is set so we have more work to do.
2179 post_field_access_by_jni(thread, obj, klass, fieldID, is_static);
2180 // event posting can block so refetch oop if we were passed a jobj
2181 if (jobj != nullptr) return JNIHandles::resolve_non_null(jobj);
2182 }
2183 return obj;
2184 }
2185
2186 void JvmtiExport::post_field_access_by_jni(JavaThread *thread, oop obj,
2187 Klass* klass, jfieldID fieldID, bool is_static) {
2188 // We must be called with a Java context in order to provide reasonable
2189 // values for the klazz, method, and location fields. The callers of this
2190 // function don't make the call unless there is a Java context.
2191 assert(thread->has_last_Java_frame(), "must be called with a Java context");
2192
2193 if (thread->is_in_any_VTMS_transition()) {
2194 return; // no events should be posted if thread is in any VTMS transition
2195 }
2196
2197 ResourceMark rm;
2198 fieldDescriptor fd;
2199 // if get_field_descriptor finds fieldID to be invalid, then we just bail
2200 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
2201 assert(valid_fieldID == true,"post_field_access_by_jni called with invalid fieldID");
2202 if (!valid_fieldID) return;
2203 // field accesses are not watched so bail
2204 if (!fd.is_field_access_watched()) return;
2205
2206 HandleMark hm(thread);
2207 Handle h_obj;
2208 if (!is_static) {
2209 // non-static field accessors have an object, but we need a handle
2210 assert(obj != nullptr, "non-static needs an object");
2211 h_obj = Handle(thread, obj);
2212 }
2213 post_field_access(thread,
2214 thread->last_frame().interpreter_frame_method(),
2215 thread->last_frame().interpreter_frame_bcp(),
2216 klass, h_obj, fieldID);
2217 }
2218
2219 void JvmtiExport::post_field_access(JavaThread *thread, Method* method,
2220 address location, Klass* field_klass, Handle object, jfieldID field) {
2221
2222 HandleMark hm(thread);
2223 methodHandle mh(thread, method);
2224
2225 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2226 if (state == nullptr) {
2227 return;
2228 }
2229 if (thread->is_in_any_VTMS_transition()) {
2230 return; // no events should be posted if thread is in any VTMS transition
2231 }
2232
2233 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Trg Field Access event triggered",
2234 JvmtiTrace::safe_get_thread_name(thread)));
2235 JvmtiEnvThreadStateIterator it(state);
2236 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2237 if (ets->is_enabled(JVMTI_EVENT_FIELD_ACCESS)) {
2238 EVT_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Evt Field Access event sent %s.%s @ " INTX_FORMAT,
2239 JvmtiTrace::safe_get_thread_name(thread),
2240 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2241 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2242 location - mh()->code_base() ));
2243
2244 JvmtiEnv *env = ets->get_env();
2245 JvmtiLocationEventMark jem(thread, mh, location);
2246 jclass field_jclass = jem.to_jclass(field_klass);
2247 jobject field_jobject = jem.to_jobject(object());
2248 JvmtiJavaThreadEventTransition jet(thread);
2249 jvmtiEventFieldAccess callback = env->callbacks()->FieldAccess;
2250 if (callback != nullptr) {
2251 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2252 jem.jni_methodID(), jem.location(),
2253 field_jclass, field_jobject, field);
2254 }
2255 }
2256 }
2257 }
2258
2259 oop JvmtiExport::jni_SetField_probe(JavaThread *thread, jobject jobj, oop obj,
2260 Klass* klass, jfieldID fieldID, bool is_static,
2261 char sig_type, jvalue *value) {
2262 if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) {
2263 // At least one field modification watch is set so we have more work to do.
2264 post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value);
2265 // event posting can block so refetch oop if we were passed a jobj
2266 if (jobj != nullptr) return JNIHandles::resolve_non_null(jobj);
2267 }
2268 return obj;
2269 }
2270
2271 void JvmtiExport::post_field_modification_by_jni(JavaThread *thread, oop obj,
2272 Klass* klass, jfieldID fieldID, bool is_static,
2273 char sig_type, jvalue *value) {
2274 // We must be called with a Java context in order to provide reasonable
2275 // values for the klazz, method, and location fields. The callers of this
2276 // function don't make the call unless there is a Java context.
2277 assert(thread->has_last_Java_frame(), "must be called with Java context");
2278
2279 if (thread->is_in_any_VTMS_transition()) {
2280 return; // no events should be posted if thread is in any VTMS transition
2281 }
2282
2283 ResourceMark rm;
2284 fieldDescriptor fd;
2285 // if get_field_descriptor finds fieldID to be invalid, then we just bail
2286 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
2287 assert(valid_fieldID == true,"post_field_modification_by_jni called with invalid fieldID");
2288 if (!valid_fieldID) return;
2289 // field modifications are not watched so bail
2290 if (!fd.is_field_modification_watched()) return;
2291
2292 HandleMark hm(thread);
2293
2294 Handle h_obj;
2295 if (!is_static) {
2296 // non-static field accessors have an object, but we need a handle
2297 assert(obj != nullptr, "non-static needs an object");
2298 h_obj = Handle(thread, obj);
2299 }
2300 post_field_modification(thread,
2301 thread->last_frame().interpreter_frame_method(),
2302 thread->last_frame().interpreter_frame_bcp(),
2303 klass, h_obj, fieldID, sig_type, value);
2304 }
2305
2306 void JvmtiExport::post_raw_field_modification(JavaThread *thread, Method* method,
2307 address location, Klass* field_klass, Handle object, jfieldID field,
2308 char sig_type, jvalue *value) {
2309
2310 if (thread->is_in_any_VTMS_transition()) {
2311 return; // no events should be posted if thread is in any VTMS transition
2312 }
2313
2314 if (sig_type == JVM_SIGNATURE_INT || sig_type == JVM_SIGNATURE_BOOLEAN ||
2315 sig_type == JVM_SIGNATURE_BYTE || sig_type == JVM_SIGNATURE_CHAR ||
2316 sig_type == JVM_SIGNATURE_SHORT) {
2317 // 'I' instructions are used for byte, char, short and int.
2318 // determine which it really is, and convert
2319 fieldDescriptor fd;
2320 bool found = JvmtiEnv::get_field_descriptor(field_klass, field, &fd);
2321 // should be found (if not, leave as is)
2322 if (found) {
2323 jint ival = value->i;
2324 // convert value from int to appropriate type
2325 switch (fd.field_type()) {
2326 case T_BOOLEAN:
2327 sig_type = JVM_SIGNATURE_BOOLEAN;
2328 value->i = 0; // clear it
2329 value->z = (jboolean)ival;
2330 break;
2331 case T_BYTE:
2332 sig_type = JVM_SIGNATURE_BYTE;
2333 value->i = 0; // clear it
2334 value->b = (jbyte)ival;
2335 break;
2336 case T_CHAR:
2337 sig_type = JVM_SIGNATURE_CHAR;
2338 value->i = 0; // clear it
2339 value->c = (jchar)ival;
2340 break;
2341 case T_SHORT:
2342 sig_type = JVM_SIGNATURE_SHORT;
2343 value->i = 0; // clear it
2344 value->s = (jshort)ival;
2345 break;
2346 case T_INT:
2347 // nothing to do
2348 break;
2349 default:
2350 // this is an integer instruction, should be one of above
2351 ShouldNotReachHere();
2352 break;
2353 }
2354 }
2355 }
2356
2357 assert(sig_type != JVM_SIGNATURE_ARRAY, "array should have sig_type == 'L'");
2358 bool handle_created = false;
2359
2360 // convert oop to JNI handle.
2361 if (sig_type == JVM_SIGNATURE_CLASS) {
2362 handle_created = true;
2363 value->l = (jobject)JNIHandles::make_local(thread, cast_to_oop(value->l));
2364 }
2365
2366 post_field_modification(thread, method, location, field_klass, object, field, sig_type, value);
2367
2368 // Destroy the JNI handle allocated above.
2369 if (handle_created) {
2370 JNIHandles::destroy_local(value->l);
2371 }
2372 }
2373
2374 void JvmtiExport::post_field_modification(JavaThread *thread, Method* method,
2375 address location, Klass* field_klass, Handle object, jfieldID field,
2376 char sig_type, jvalue *value_ptr) {
2377
2378 HandleMark hm(thread);
2379 methodHandle mh(thread, method);
2380
2381 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2382 if (state == nullptr) {
2383 return;
2384 }
2385 if (thread->is_in_any_VTMS_transition()) {
2386 return; // no events should be posted if thread is in any VTMS transition
2387 }
2388
2389 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
2390 ("[%s] Trg Field Modification event triggered",
2391 JvmtiTrace::safe_get_thread_name(thread)));
2392 JvmtiEnvThreadStateIterator it(state);
2393 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2394 if (ets->is_enabled(JVMTI_EVENT_FIELD_MODIFICATION)) {
2395 EVT_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
2396 ("[%s] Evt Field Modification event sent %s.%s @ " INTX_FORMAT,
2397 JvmtiTrace::safe_get_thread_name(thread),
2398 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2399 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2400 location - mh()->code_base() ));
2401
2402 JvmtiEnv *env = ets->get_env();
2403 JvmtiLocationEventMark jem(thread, mh, location);
2404 jclass field_jclass = jem.to_jclass(field_klass);
2405 jobject field_jobject = jem.to_jobject(object());
2406 JvmtiJavaThreadEventTransition jet(thread);
2407 jvmtiEventFieldModification callback = env->callbacks()->FieldModification;
2408 if (callback != nullptr) {
2409 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2410 jem.jni_methodID(), jem.location(),
2411 field_jclass, field_jobject, field, sig_type, *value_ptr);
2412 }
2413 }
2414 }
2415 }
2416
2417 void JvmtiExport::post_native_method_bind(Method* method, address* function_ptr) {
2418 JavaThread* thread = JavaThread::current();
2419 assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
2420
2421 HandleMark hm(thread);
2422 methodHandle mh(thread, method);
2423
2424 if (thread->is_in_any_VTMS_transition()) {
2425 return; // no events should be posted if thread is in any VTMS transition
2426 }
2427 EVT_TRIG_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Trg Native Method Bind event triggered",
2428 JvmtiTrace::safe_get_thread_name(thread)));
2429
2430 if (JvmtiEventController::is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
2431 JvmtiEnvIterator it;
2432 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2433 if (env->is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
2434 EVT_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Evt Native Method Bind event sent",
2435 JvmtiTrace::safe_get_thread_name(thread) ));
2436
2437 JvmtiMethodEventMark jem(thread, mh);
2438 JvmtiJavaThreadEventTransition jet(thread);
2439 JNIEnv* jni_env = (env->phase() == JVMTI_PHASE_PRIMORDIAL) ? nullptr : jem.jni_env();
2440 jvmtiEventNativeMethodBind callback = env->callbacks()->NativeMethodBind;
2441 if (callback != nullptr) {
2442 (*callback)(env->jvmti_external(), jni_env, jem.jni_thread(),
2443 jem.jni_methodID(), (void*)(*function_ptr), (void**)function_ptr);
2444 }
2445 }
2446 }
2447 }
2448 }
2449
2450 // Returns a record containing inlining information for the given nmethod
2451 static jvmtiCompiledMethodLoadInlineRecord* create_inline_record(nmethod* nm) {
2452 jint numstackframes = 0;
2453 jvmtiCompiledMethodLoadInlineRecord* record = (jvmtiCompiledMethodLoadInlineRecord*)NEW_RESOURCE_OBJ(jvmtiCompiledMethodLoadInlineRecord);
2454 record->header.kind = JVMTI_CMLR_INLINE_INFO;
2455 record->header.next = nullptr;
2456 record->header.majorinfoversion = JVMTI_CMLR_MAJOR_VERSION_1;
2457 record->header.minorinfoversion = JVMTI_CMLR_MINOR_VERSION_0;
2458 record->numpcs = 0;
2459 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
2460 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
2461 record->numpcs++;
2462 }
2463 record->pcinfo = (PCStackInfo*)(NEW_RESOURCE_ARRAY(PCStackInfo, record->numpcs));
2464 int scope = 0;
2465 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
2466 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
2467 void* pc_address = (void*)p->real_pc(nm);
2468 assert(pc_address != nullptr, "pc_address must be non-null");
2469 record->pcinfo[scope].pc = pc_address;
2470 numstackframes=0;
2471 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != nullptr;sd = sd->sender()) {
2472 numstackframes++;
2473 }
2474 assert(numstackframes != 0, "numstackframes must be nonzero.");
2475 record->pcinfo[scope].methods = (jmethodID *)NEW_RESOURCE_ARRAY(jmethodID, numstackframes);
2476 record->pcinfo[scope].bcis = (jint *)NEW_RESOURCE_ARRAY(jint, numstackframes);
2477 record->pcinfo[scope].numstackframes = numstackframes;
2478 int stackframe = 0;
2479 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != nullptr;sd = sd->sender()) {
2480 // 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()
2481 guarantee(sd->method() != nullptr, "sd->method() cannot be null.");
2482 record->pcinfo[scope].methods[stackframe] = sd->method()->jmethod_id();
2483 record->pcinfo[scope].bcis[stackframe] = sd->bci();
2484 stackframe++;
2485 }
2486 scope++;
2487 }
2488 return record;
2489 }
2490
2491 void JvmtiExport::post_compiled_method_load(nmethod *nm) {
2492 guarantee(!nm->is_unloading(), "nmethod isn't unloaded or unloading");
2493 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
2494 return;
2495 }
2496 JavaThread* thread = JavaThread::current();
2497
2498 assert(!thread->is_in_any_VTMS_transition(), "compiled method load events are not allowed in any VTMS transition");
2499
2500 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2501 ("[%s] method compile load event triggered",
2502 JvmtiTrace::safe_get_thread_name(thread)));
2503
2504 JvmtiEnvIterator it;
2505 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2506 post_compiled_method_load(env, nm);
2507 }
2508 }
2509
2510 // post a COMPILED_METHOD_LOAD event for a given environment
2511 void JvmtiExport::post_compiled_method_load(JvmtiEnv* env, nmethod *nm) {
2512 if (env->phase() == JVMTI_PHASE_PRIMORDIAL || !env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) {
2513 return;
2514 }
2515 jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad;
2516 if (callback == nullptr) {
2517 return;
2518 }
2519 JavaThread* thread = JavaThread::current();
2520
2521 assert(!thread->is_in_any_VTMS_transition(), "compiled method load events are not allowed in any VTMS transition");
2522
2523 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2524 ("[%s] method compile load event sent %s.%s ",
2525 JvmtiTrace::safe_get_thread_name(thread),
2526 (nm->method() == nullptr) ? "null" : nm->method()->klass_name()->as_C_string(),
2527 (nm->method() == nullptr) ? "null" : nm->method()->name()->as_C_string()));
2528 ResourceMark rm(thread);
2529 HandleMark hm(thread);
2530
2531 // Add inlining information
2532 jvmtiCompiledMethodLoadInlineRecord* inlinerecord = create_inline_record(nm);
2533 // Pass inlining information through the void pointer
2534 JvmtiCompiledMethodLoadEventMark jem(thread, nm, inlinerecord);
2535 JvmtiJavaThreadEventTransition jet(thread);
2536 (*callback)(env->jvmti_external(), jem.jni_methodID(),
2537 jem.code_size(), jem.code_data(), jem.map_length(),
2538 jem.map(), jem.compile_info());
2539 }
2540
2541 void JvmtiExport::post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) {
2542 assert(name != nullptr && name[0] != '\0', "sanity check");
2543
2544 JavaThread* thread = JavaThread::current();
2545
2546 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition");
2547
2548 // In theory everyone coming thru here is in_vm but we need to be certain
2549 // because a callee will do a vm->native transition
2550 ThreadInVMfromUnknown __tiv;
2551
2552 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2553 ("[%s] method dynamic code generated event triggered",
2554 JvmtiTrace::safe_get_thread_name(thread)));
2555 JvmtiEnvIterator it;
2556 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2557 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
2558 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2559 ("[%s] dynamic code generated event sent for %s",
2560 JvmtiTrace::safe_get_thread_name(thread), name));
2561 JvmtiEventMark jem(thread);
2562 JvmtiJavaThreadEventTransition jet(thread);
2563 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
2564 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
2565 if (callback != nullptr) {
2566 (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
2567 }
2568 }
2569 }
2570 }
2571
2572 void JvmtiExport::post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) {
2573 jvmtiPhase phase = JvmtiEnv::get_phase();
2574 if (phase == JVMTI_PHASE_PRIMORDIAL || phase == JVMTI_PHASE_START) {
2575 post_dynamic_code_generated_internal(name, code_begin, code_end);
2576 } else {
2577 // It may not be safe to post the event from this thread. Defer all
2578 // postings to the service thread so that it can perform them in a safe
2579 // context and in-order.
2580 JvmtiDeferredEvent event = JvmtiDeferredEvent::dynamic_code_generated_event(
2581 name, code_begin, code_end);
2582 ServiceThread::enqueue_deferred_event(&event);
2583 }
2584 }
2585
2586
2587 // post a DYNAMIC_CODE_GENERATED event for a given environment
2588 // used by GenerateEvents
2589 void JvmtiExport::post_dynamic_code_generated(JvmtiEnv* env, const char *name,
2590 const void *code_begin, const void *code_end)
2591 {
2592 JavaThread* thread = JavaThread::current();
2593
2594 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition");
2595
2596 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2597 ("[%s] dynamic code generated event triggered (by GenerateEvents)",
2598 JvmtiTrace::safe_get_thread_name(thread)));
2599 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
2600 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2601 ("[%s] dynamic code generated event sent for %s",
2602 JvmtiTrace::safe_get_thread_name(thread), name));
2603 JvmtiEventMark jem(thread);
2604 JvmtiJavaThreadEventTransition jet(thread);
2605 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
2606 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
2607 if (callback != nullptr) {
2608 (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
2609 }
2610 }
2611 }
2612
2613 // post a DynamicCodeGenerated event while holding locks in the VM.
2614 void JvmtiExport::post_dynamic_code_generated_while_holding_locks(const char* name,
2615 address code_begin, address code_end)
2616 {
2617 JavaThread* thread = JavaThread::current();
2618 // register the stub with the current dynamic code event collector
2619 // Cannot take safepoint here so do not use state_for to get
2620 // jvmti thread state.
2621 // The collector and/or state might be null if JvmtiDynamicCodeEventCollector
2622 // has been initialized while JVMTI_EVENT_DYNAMIC_CODE_GENERATED was disabled.
2623 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2624 if (state != nullptr) {
2625 JvmtiDynamicCodeEventCollector *collector = state->get_dynamic_code_event_collector();
2626 if (collector != nullptr) {
2627 collector->register_stub(name, code_begin, code_end);
2628 }
2629 }
2630 }
2631
2632 // Collect all the vm internally allocated objects which are visible to java world
2633 void JvmtiExport::record_vm_internal_object_allocation(oop obj) {
2634 Thread* thread = Thread::current_or_null();
2635 if (thread != nullptr && thread->is_Java_thread()) {
2636 // Can not take safepoint here.
2637 NoSafepointVerifier no_sfpt;
2638 // Cannot take safepoint here so do not use state_for to get
2639 // jvmti thread state.
2640 JvmtiThreadState *state = JavaThread::cast(thread)->jvmti_thread_state();
2641 if (state != nullptr) {
2642 // state is non null when VMObjectAllocEventCollector is enabled.
2643 JvmtiVMObjectAllocEventCollector *collector;
2644 collector = state->get_vm_object_alloc_event_collector();
2645 if (collector != nullptr && collector->is_enabled()) {
2646 // Don't record classes as these will be notified via the ClassLoad
2647 // event.
2648 if (obj->klass() != vmClasses::Class_klass()) {
2649 collector->record_allocation(obj);
2650 }
2651 }
2652 }
2653 }
2654 }
2655
2656 // Collect all the sampled allocated objects.
2657 void JvmtiExport::record_sampled_internal_object_allocation(oop obj) {
2658 Thread* thread = Thread::current_or_null();
2659 if (thread != nullptr && thread->is_Java_thread()) {
2660 // Can not take safepoint here.
2661 NoSafepointVerifier no_sfpt;
2662 // Cannot take safepoint here so do not use state_for to get
2663 // jvmti thread state.
2664 JvmtiThreadState *state = JavaThread::cast(thread)->jvmti_thread_state();
2665 if (state != nullptr) {
2666 // state is non null when SampledObjectAllocEventCollector is enabled.
2667 JvmtiSampledObjectAllocEventCollector *collector;
2668 collector = state->get_sampled_object_alloc_event_collector();
2669
2670 if (collector != nullptr && collector->is_enabled()) {
2671 collector->record_allocation(obj);
2672 }
2673 }
2674 }
2675 }
2676
2677 void JvmtiExport::post_garbage_collection_finish() {
2678 Thread *thread = Thread::current(); // this event is posted from VM-Thread.
2679 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
2680 ("[%s] garbage collection finish event triggered",
2681 JvmtiTrace::safe_get_thread_name(thread)));
2682 JvmtiEnvIterator it;
2683 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2684 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH)) {
2685 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
2686 ("[%s] garbage collection finish event sent",
2687 JvmtiTrace::safe_get_thread_name(thread)));
2688 JvmtiThreadEventTransition jet(thread);
2689 // JNIEnv is null here because this event is posted from VM Thread
2690 jvmtiEventGarbageCollectionFinish callback = env->callbacks()->GarbageCollectionFinish;
2691 if (callback != nullptr) {
2692 (*callback)(env->jvmti_external());
2693 }
2694 }
2695 }
2696 }
2697
2698 void JvmtiExport::post_garbage_collection_start() {
2699 Thread* thread = Thread::current(); // this event is posted from vm-thread.
2700 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
2701 ("[%s] garbage collection start event triggered",
2702 JvmtiTrace::safe_get_thread_name(thread)));
2703 JvmtiEnvIterator it;
2704 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2705 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_START)) {
2706 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
2707 ("[%s] garbage collection start event sent",
2708 JvmtiTrace::safe_get_thread_name(thread)));
2709 JvmtiThreadEventTransition jet(thread);
2710 // JNIEnv is null here because this event is posted from VM Thread
2711 jvmtiEventGarbageCollectionStart callback = env->callbacks()->GarbageCollectionStart;
2712 if (callback != nullptr) {
2713 (*callback)(env->jvmti_external());
2714 }
2715 }
2716 }
2717 }
2718
2719 void JvmtiExport::post_data_dump() {
2720 Thread *thread = Thread::current();
2721 EVT_TRIG_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
2722 ("[%s] data dump request event triggered",
2723 JvmtiTrace::safe_get_thread_name(thread)));
2724 JvmtiEnvIterator it;
2725 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2726 if (env->is_enabled(JVMTI_EVENT_DATA_DUMP_REQUEST)) {
2727 EVT_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
2728 ("[%s] data dump request event sent",
2729 JvmtiTrace::safe_get_thread_name(thread)));
2730 JvmtiThreadEventTransition jet(thread);
2731 // JNIEnv is null here because this event is posted from VM Thread
2732 jvmtiEventDataDumpRequest callback = env->callbacks()->DataDumpRequest;
2733 if (callback != nullptr) {
2734 (*callback)(env->jvmti_external());
2735 }
2736 }
2737 }
2738 }
2739
2740 void JvmtiExport::post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) {
2741 oop object = obj_mntr->object();
2742 HandleMark hm(thread);
2743 Handle h(thread, object);
2744
2745 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2746 if (state == nullptr) {
2747 return;
2748 }
2749 if (thread->is_in_any_VTMS_transition()) {
2750 return; // no events should be posted if thread is in any VTMS transition
2751 }
2752
2753 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2754 ("[%s] monitor contended enter event triggered",
2755 JvmtiTrace::safe_get_thread_name(thread)));
2756 JvmtiEnvThreadStateIterator it(state);
2757 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2758 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTER)) {
2759 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2760 ("[%s] monitor contended enter event sent",
2761 JvmtiTrace::safe_get_thread_name(thread)));
2762 JvmtiMonitorEventMark jem(thread, h());
2763 JvmtiEnv *env = ets->get_env();
2764 JvmtiThreadEventTransition jet(thread);
2765 jvmtiEventMonitorContendedEnter callback = env->callbacks()->MonitorContendedEnter;
2766 if (callback != nullptr) {
2767 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2768 }
2769 }
2770 }
2771 }
2772
2773 void JvmtiExport::post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) {
2774 oop object = obj_mntr->object();
2775 HandleMark hm(thread);
2776 Handle h(thread, object);
2777
2778 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2779 if (state == nullptr) {
2780 return;
2781 }
2782 if (thread->is_in_any_VTMS_transition()) {
2783 return; // no events should be posted if thread is in any VTMS transition
2784 }
2785
2786 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2787 ("[%s] monitor contended entered event triggered",
2788 JvmtiTrace::safe_get_thread_name(thread)));
2789
2790 JvmtiEnvThreadStateIterator it(state);
2791 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2792 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED)) {
2793 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2794 ("[%s] monitor contended enter event sent",
2795 JvmtiTrace::safe_get_thread_name(thread)));
2796 JvmtiMonitorEventMark jem(thread, h());
2797 JvmtiEnv *env = ets->get_env();
2798 JvmtiThreadEventTransition jet(thread);
2799 jvmtiEventMonitorContendedEntered callback = env->callbacks()->MonitorContendedEntered;
2800 if (callback != nullptr) {
2801 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2802 }
2803 }
2804 }
2805 }
2806
2807 void JvmtiExport::post_monitor_wait(JavaThread *thread, oop object,
2808 jlong timeout) {
2809 HandleMark hm(thread);
2810 Handle h(thread, object);
2811
2812 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2813 if (state == nullptr) {
2814 return;
2815 }
2816 if (thread->is_in_any_VTMS_transition()) {
2817 return; // no events should be posted if thread is in any VTMS transition
2818 }
2819
2820 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2821 ("[%s] monitor wait event triggered",
2822 JvmtiTrace::safe_get_thread_name(thread)));
2823 JvmtiEnvThreadStateIterator it(state);
2824 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2825 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAIT)) {
2826 EVT_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2827 ("[%s] monitor wait event sent",
2828 JvmtiTrace::safe_get_thread_name(thread)));
2829 JvmtiMonitorEventMark jem(thread, h());
2830 JvmtiEnv *env = ets->get_env();
2831 JvmtiThreadEventTransition jet(thread);
2832 jvmtiEventMonitorWait callback = env->callbacks()->MonitorWait;
2833 if (callback != nullptr) {
2834 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2835 jem.jni_object(), timeout);
2836 }
2837 }
2838 }
2839 }
2840
2841 void JvmtiExport::post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) {
2842 oop object = obj_mntr->object();
2843 HandleMark hm(thread);
2844 Handle h(thread, object);
2845
2846 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2847 if (state == nullptr) {
2848 return;
2849 }
2850 if (thread->is_in_any_VTMS_transition()) {
2851 return; // no events should be posted if thread is in any VTMS transition
2852 }
2853
2854 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2855 ("[%s] monitor waited event triggered",
2856 JvmtiTrace::safe_get_thread_name(thread)));
2857 JvmtiEnvThreadStateIterator it(state);
2858 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2859 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAITED)) {
2860 EVT_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2861 ("[%s] monitor waited event sent",
2862 JvmtiTrace::safe_get_thread_name(thread)));
2863 JvmtiMonitorEventMark jem(thread, h());
2864 JvmtiEnv *env = ets->get_env();
2865 JvmtiThreadEventTransition jet(thread);
2866 jvmtiEventMonitorWaited callback = env->callbacks()->MonitorWaited;
2867 if (callback != nullptr) {
2868 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2869 jem.jni_object(), timed_out);
2870 }
2871 }
2872 }
2873 }
2874
2875 void JvmtiExport::post_vm_object_alloc(JavaThread *thread, oop object) {
2876 if (object == nullptr) {
2877 return;
2878 }
2879 if (thread->is_in_any_VTMS_transition()) {
2880 return; // no events should be posted if thread is in any VTMS transition
2881 }
2882 HandleMark hm(thread);
2883 Handle h(thread, object);
2884
2885 EVT_TRIG_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Trg vm object alloc triggered",
2886 JvmtiTrace::safe_get_thread_name(thread)));
2887 JvmtiEnvIterator it;
2888 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2889 if (env->is_enabled(JVMTI_EVENT_VM_OBJECT_ALLOC)) {
2890 EVT_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Evt vmobject alloc sent %s",
2891 JvmtiTrace::safe_get_thread_name(thread),
2892 object==nullptr? "null" : object->klass()->external_name()));
2893
2894 JvmtiObjectAllocEventMark jem(thread, h());
2895 JvmtiJavaThreadEventTransition jet(thread);
2896 jvmtiEventVMObjectAlloc callback = env->callbacks()->VMObjectAlloc;
2897 if (callback != nullptr) {
2898 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2899 jem.jni_jobject(), jem.jni_class(), jem.size());
2900 }
2901 }
2902 }
2903 }
2904
2905 void JvmtiExport::post_sampled_object_alloc(JavaThread *thread, oop object) {
2906 HandleMark hm(thread);
2907 Handle h(thread, object);
2908
2909 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2910 if (state == nullptr) {
2911 return;
2912 }
2913 if (object == nullptr) {
2914 return;
2915 }
2916 if (thread->is_in_any_VTMS_transition()) {
2917 return; // no events should be posted if thread is in any VTMS transition
2918 }
2919
2920 EVT_TRIG_TRACE(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC,
2921 ("[%s] Trg sampled object alloc triggered",
2922 JvmtiTrace::safe_get_thread_name(thread)));
2923 JvmtiEnvThreadStateIterator it(state);
2924 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2925 if (ets->is_enabled(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC)) {
2926 EVT_TRACE(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC,
2927 ("[%s] Evt sampled object alloc sent %s",
2928 JvmtiTrace::safe_get_thread_name(thread),
2929 object == nullptr ? "null" : object->klass()->external_name()));
2930
2931 JvmtiEnv *env = ets->get_env();
2932 JvmtiObjectAllocEventMark jem(thread, h());
2933 JvmtiJavaThreadEventTransition jet(thread);
2934 jvmtiEventSampledObjectAlloc callback = env->callbacks()->SampledObjectAlloc;
2935 if (callback != nullptr) {
2936 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2937 jem.jni_jobject(), jem.jni_class(), jem.size());
2938 }
2939 }
2940 }
2941 }
2942
2943 ////////////////////////////////////////////////////////////////////////////////////////////////
2944
2945 void JvmtiExport::cleanup_thread(JavaThread* thread) {
2946 assert(JavaThread::current() == thread, "thread is not current");
2947 MutexLocker mu(thread, JvmtiThreadState_lock);
2948
2949 if (thread->jvmti_thread_state() != nullptr) {
2950 // This has to happen after the thread state is removed, which is
2951 // why it is not in post_thread_end_event like its complement
2952 // Maybe both these functions should be rolled into the posts?
2953 JvmtiEventController::thread_ended(thread);
2954 }
2955 }
2956
2957 void JvmtiExport::clear_detected_exception(JavaThread* thread) {
2958 assert(JavaThread::current() == thread, "thread is not current");
2959
2960 JvmtiThreadState* state = thread->jvmti_thread_state();
2961 if (state != nullptr) {
2962 state->clear_exception_state();
2963 }
2964 }
2965
2966 // Onload raw monitor transition.
2967 void JvmtiExport::transition_pending_onload_raw_monitors() {
2968 JvmtiPendingMonitors::transition_raw_monitors();
2969 }
2970
2971 // Setup current current thread for event collection.
2972 void JvmtiEventCollector::setup_jvmti_thread_state() {
2973 // set this event collector to be the current one.
2974 JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current());
2975 // state can only be null if the current thread is exiting which
2976 // should not happen since we're trying to configure for event collection
2977 guarantee(state != nullptr, "exiting thread called setup_jvmti_thread_state");
2978 if (is_vm_object_alloc_event()) {
2979 JvmtiVMObjectAllocEventCollector *prev = state->get_vm_object_alloc_event_collector();
2980
2981 // If we have a previous collector and it is disabled, it means this allocation came from a
2982 // callback induced VM Object allocation, do not register this collector then.
2983 if (prev && !prev->is_enabled()) {
2984 return;
2985 }
2986 _prev = prev;
2987 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)this);
2988 } else if (is_dynamic_code_event()) {
2989 _prev = state->get_dynamic_code_event_collector();
2990 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)this);
2991 } else if (is_sampled_object_alloc_event()) {
2992 JvmtiSampledObjectAllocEventCollector *prev = state->get_sampled_object_alloc_event_collector();
2993
2994 if (prev) {
2995 // JvmtiSampledObjectAllocEventCollector wants only one active collector
2996 // enabled. This allows to have a collector detect a user code requiring
2997 // a sample in the callback.
2998 return;
2999 }
3000 state->set_sampled_object_alloc_event_collector((JvmtiSampledObjectAllocEventCollector*) this);
3001 }
3002
3003 _unset_jvmti_thread_state = true;
3004 }
3005
3006 // Unset current event collection in this thread and reset it with previous
3007 // collector.
3008 void JvmtiEventCollector::unset_jvmti_thread_state() {
3009 if (!_unset_jvmti_thread_state) {
3010 return;
3011 }
3012
3013 JvmtiThreadState* state = JavaThread::current()->jvmti_thread_state();
3014 if (state != nullptr) {
3015 // restore the previous event collector (if any)
3016 if (is_vm_object_alloc_event()) {
3017 if (state->get_vm_object_alloc_event_collector() == this) {
3018 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)_prev);
3019 } else {
3020 // this thread's jvmti state was created during the scope of
3021 // the event collector.
3022 }
3023 } else if (is_dynamic_code_event()) {
3024 if (state->get_dynamic_code_event_collector() == this) {
3025 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)_prev);
3026 } else {
3027 // this thread's jvmti state was created during the scope of
3028 // the event collector.
3029 }
3030 } else if (is_sampled_object_alloc_event()) {
3031 if (state->get_sampled_object_alloc_event_collector() == this) {
3032 state->set_sampled_object_alloc_event_collector((JvmtiSampledObjectAllocEventCollector*)_prev);
3033 } else {
3034 // this thread's jvmti state was created during the scope of
3035 // the event collector.
3036 }
3037 }
3038 }
3039 }
3040
3041 // create the dynamic code event collector
3042 JvmtiDynamicCodeEventCollector::JvmtiDynamicCodeEventCollector() : _code_blobs(nullptr) {
3043 if (JvmtiExport::should_post_dynamic_code_generated()) {
3044 setup_jvmti_thread_state();
3045 }
3046 }
3047
3048 // iterate over any code blob descriptors collected and post a
3049 // DYNAMIC_CODE_GENERATED event to the profiler.
3050 JvmtiDynamicCodeEventCollector::~JvmtiDynamicCodeEventCollector() {
3051 assert(!JavaThread::current()->owns_locks(), "all locks must be released to post deferred events");
3052 // iterate over any code blob descriptors that we collected
3053 if (_code_blobs != nullptr) {
3054 for (int i=0; i<_code_blobs->length(); i++) {
3055 JvmtiCodeBlobDesc* blob = _code_blobs->at(i);
3056 JvmtiExport::post_dynamic_code_generated(blob->name(), blob->code_begin(), blob->code_end());
3057 FreeHeap(blob);
3058 }
3059 delete _code_blobs;
3060 }
3061 unset_jvmti_thread_state();
3062 }
3063
3064 // register a stub
3065 void JvmtiDynamicCodeEventCollector::register_stub(const char* name, address start, address end) {
3066 if (_code_blobs == nullptr) {
3067 _code_blobs = new (mtServiceability) GrowableArray<JvmtiCodeBlobDesc*>(1, mtServiceability);
3068 }
3069 _code_blobs->append(new JvmtiCodeBlobDesc(name, start, end));
3070 }
3071
3072 // Setup current thread to record vm allocated objects.
3073 JvmtiObjectAllocEventCollector::JvmtiObjectAllocEventCollector() :
3074 _allocated(nullptr), _enable(false), _post_callback(nullptr) {
3075 }
3076
3077 // Post vm_object_alloc event for vm allocated objects visible to java
3078 // world.
3079 void JvmtiObjectAllocEventCollector::generate_call_for_allocated() {
3080 if (_allocated) {
3081 set_enabled(false);
3082 for (int i = 0; i < _allocated->length(); i++) {
3083 oop obj = _allocated->at(i).resolve();
3084 _post_callback(JavaThread::current(), obj);
3085 // Release OopHandle
3086 _allocated->at(i).release(JvmtiExport::jvmti_oop_storage());
3087
3088 }
3089 delete _allocated, _allocated = nullptr;
3090 }
3091 }
3092
3093 void JvmtiObjectAllocEventCollector::record_allocation(oop obj) {
3094 assert(is_enabled(), "Object alloc event collector is not enabled");
3095 if (_allocated == nullptr) {
3096 _allocated = new (mtServiceability) GrowableArray<OopHandle>(1, mtServiceability);
3097 }
3098 _allocated->push(OopHandle(JvmtiExport::jvmti_oop_storage(), obj));
3099 }
3100
3101 // Disable collection of VMObjectAlloc events
3102 NoJvmtiVMObjectAllocMark::NoJvmtiVMObjectAllocMark() : _collector(nullptr) {
3103 // a no-op if VMObjectAlloc event is not enabled
3104 if (!JvmtiExport::should_post_vm_object_alloc()) {
3105 return;
3106 }
3107 Thread* thread = Thread::current_or_null();
3108 if (thread != nullptr && thread->is_Java_thread()) {
3109 JavaThread* current_thread = JavaThread::cast(thread);
3110 JvmtiThreadState *state = current_thread->jvmti_thread_state();
3111 if (state != nullptr) {
3112 JvmtiVMObjectAllocEventCollector *collector;
3113 collector = state->get_vm_object_alloc_event_collector();
3114 if (collector != nullptr && collector->is_enabled()) {
3115 _collector = collector;
3116 _collector->set_enabled(false);
3117 }
3118 }
3119 }
3120 }
3121
3122 // Re-Enable collection of VMObjectAlloc events (if previously enabled)
3123 NoJvmtiVMObjectAllocMark::~NoJvmtiVMObjectAllocMark() {
3124 if (was_enabled()) {
3125 _collector->set_enabled(true);
3126 }
3127 };
3128
3129 // Setup current thread to record vm allocated objects.
3130 JvmtiVMObjectAllocEventCollector::JvmtiVMObjectAllocEventCollector() {
3131 if (JvmtiExport::should_post_vm_object_alloc()) {
3132 _enable = true;
3133 setup_jvmti_thread_state();
3134 _post_callback = JvmtiExport::post_vm_object_alloc;
3135 }
3136 }
3137
3138 JvmtiVMObjectAllocEventCollector::~JvmtiVMObjectAllocEventCollector() {
3139 if (_enable) {
3140 generate_call_for_allocated();
3141 }
3142 unset_jvmti_thread_state();
3143 }
3144
3145 bool JvmtiSampledObjectAllocEventCollector::object_alloc_is_safe_to_sample() {
3146 Thread* thread = Thread::current();
3147 // Really only sample allocations if this is a JavaThread and not the compiler
3148 // thread.
3149 if (!thread->is_Java_thread() || thread->is_Compiler_thread()) {
3150 return false;
3151 }
3152
3153 // If the current thread is attaching from native and its Java thread object
3154 // is being allocated, things are not ready for allocation sampling.
3155 JavaThread* jt = JavaThread::cast(thread);
3156 if (jt->is_attaching_via_jni() && jt->threadObj() == nullptr) {
3157 return false;
3158 }
3159
3160 return true;
3161 }
3162
3163 // Setup current thread to record sampled allocated objects.
3164 void JvmtiSampledObjectAllocEventCollector::start() {
3165 if (JvmtiExport::should_post_sampled_object_alloc()) {
3166 if (!object_alloc_is_safe_to_sample()) {
3167 return;
3168 }
3169
3170 _enable = true;
3171 setup_jvmti_thread_state();
3172 _post_callback = JvmtiExport::post_sampled_object_alloc;
3173 }
3174 }
3175
3176 JvmtiSampledObjectAllocEventCollector::~JvmtiSampledObjectAllocEventCollector() {
3177 if (!_enable) {
3178 return;
3179 }
3180
3181 generate_call_for_allocated();
3182 unset_jvmti_thread_state();
3183
3184 // Unset the sampling collector as present in assertion mode only.
3185 assert(Thread::current()->is_Java_thread(),
3186 "Should always be in a Java thread");
3187 }
3188
3189 JvmtiGCMarker::JvmtiGCMarker() {
3190 // if there aren't any JVMTI environments then nothing to do
3191 if (!JvmtiEnv::environments_might_exist()) {
3192 return;
3193 }
3194
3195 if (JvmtiExport::should_post_garbage_collection_start()) {
3196 JvmtiExport::post_garbage_collection_start();
3197 }
3198
3199 if (SafepointSynchronize::is_at_safepoint()) {
3200 // Do clean up tasks that need to be done at a safepoint
3201 JvmtiEnvBase::check_for_periodic_clean_up();
3202 }
3203 }
3204
3205 JvmtiGCMarker::~JvmtiGCMarker() {
3206 // if there aren't any JVMTI environments then nothing to do
3207 if (!JvmtiEnv::environments_might_exist()) {
3208 return;
3209 }
3210
3211 // JVMTI notify gc finish
3212 if (JvmtiExport::should_post_garbage_collection_finish()) {
3213 JvmtiExport::post_garbage_collection_finish();
3214 }
3215 }