1 /*
2 * Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/moduleEntry.hpp"
28 #include "classfile/vmClasses.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/pcDesc.hpp"
32 #include "code/scopeDesc.hpp"
33 #include "gc/shared/oopStorageSet.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "jvmtifiles/jvmtiEnv.hpp"
36 #include "logging/log.hpp"
37 #include "logging/logStream.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "memory/universe.hpp"
41 #include "oops/klass.inline.hpp"
42 #include "oops/objArrayKlass.hpp"
43 #include "oops/objArrayOop.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "oops/oopHandle.inline.hpp"
46 #include "prims/jvmtiAgentList.hpp"
47 #include "prims/jvmtiCodeBlobEvents.hpp"
48 #include "prims/jvmtiEventController.hpp"
49 #include "prims/jvmtiEventController.inline.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "prims/jvmtiImpl.hpp"
52 #include "prims/jvmtiManageCapabilities.hpp"
53 #include "prims/jvmtiRawMonitor.hpp"
54 #include "prims/jvmtiRedefineClasses.hpp"
55 #include "prims/jvmtiTagMap.hpp"
56 #include "prims/jvmtiThreadState.inline.hpp"
57 #include "runtime/arguments.hpp"
58 #include "runtime/fieldDescriptor.inline.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/interfaceSupport.inline.hpp"
61 #include "runtime/javaCalls.hpp"
62 #include "runtime/javaThread.hpp"
63 #include "runtime/jniHandles.inline.hpp"
64 #include "runtime/keepStackGCProcessed.hpp"
65 #include "runtime/objectMonitor.hpp"
66 #include "runtime/objectMonitor.inline.hpp"
67 #include "runtime/os.hpp"
68 #include "runtime/osThread.hpp"
69 #include "runtime/safepointVerifiers.hpp"
70 #include "runtime/serviceThread.hpp"
71 #include "runtime/threads.hpp"
72 #include "runtime/threadSMR.hpp"
73 #include "runtime/vframe.inline.hpp"
74 #include "runtime/vm_version.hpp"
75 #include "utilities/macros.hpp"
76
77 #ifdef JVMTI_TRACE
78 #define EVT_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_SENT) != 0) { SafeResourceMark rm; log_trace(jvmti) out; }
79 #define EVT_TRIG_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_TRIGGER) != 0) { SafeResourceMark rm; log_trace(jvmti) out; }
80 #else
81 #define EVT_TRIG_TRACE(evt,out)
82 #define EVT_TRACE(evt,out)
83 #endif
84
85 ///////////////////////////////////////////////////////////////
86 //
87 // JvmtiEventTransition
88 //
89 // TO DO --
90 // more handle purging
91
92 // Use this for JavaThreads and state is _thread_in_vm.
93 class JvmtiJavaThreadEventTransition : StackObj {
94 private:
95 ResourceMark _rm;
96 ThreadToNativeFromVM _transition;
97 HandleMark _hm;
98
99 public:
100 JvmtiJavaThreadEventTransition(JavaThread *thread) :
101 _rm(),
102 _transition(thread),
103 _hm(thread) {};
104 };
105
106 // For JavaThreads which are not in _thread_in_vm state
107 // and other system threads use this.
108 class JvmtiThreadEventTransition : StackObj {
109 private:
110 ResourceMark _rm;
111 HandleMark _hm;
112 JavaThreadState _saved_state;
113 JavaThread *_jthread;
114
115 public:
116 JvmtiThreadEventTransition(Thread *thread) : _rm(), _hm(thread) {
117 if (thread->is_Java_thread()) {
118 _jthread = JavaThread::cast(thread);
119 _saved_state = _jthread->thread_state();
120 if (_saved_state == _thread_in_Java) {
121 ThreadStateTransition::transition_from_java(_jthread, _thread_in_native);
122 } else {
123 ThreadStateTransition::transition_from_vm(_jthread, _thread_in_native);
124 }
125 } else {
126 _jthread = nullptr;
127 }
128 }
129
130 ~JvmtiThreadEventTransition() {
131 if (_jthread != nullptr)
132 ThreadStateTransition::transition_from_native(_jthread, _saved_state);
133 }
134 };
135
136
137 ///////////////////////////////////////////////////////////////
138 //
139 // JvmtiEventMark
140 //
141
142 class JvmtiEventMark : public StackObj {
143 private:
144 JavaThread *_thread;
145 JNIEnv* _jni_env;
146 JvmtiThreadState::ExceptionState _saved_exception_state;
147
148 public:
149 JvmtiEventMark(JavaThread *thread) : _thread(thread),
150 _jni_env(thread->jni_environment()),
151 _saved_exception_state(JvmtiThreadState::ES_CLEARED) {
152 JvmtiThreadState *state = thread->jvmti_thread_state();
153 // we are before an event.
154 // Save current jvmti thread exception state.
155 if (state != nullptr) {
156 _saved_exception_state = state->get_exception_state();
157 }
158
159 thread->push_jni_handle_block();
160 assert(thread == JavaThread::current(), "thread must be current!");
161 thread->frame_anchor()->make_walkable();
162 };
163
164 ~JvmtiEventMark() {
165 _thread->pop_jni_handle_block();
166
167 JvmtiThreadState* state = _thread->jvmti_thread_state();
168 // we are continuing after an event.
169 if (state != nullptr) {
170 // Restore the jvmti thread exception state.
171 state->restore_exception_state(_saved_exception_state);
172 }
173 }
174
175 jobject to_jobject(oop obj) { return JNIHandles::make_local(_thread,obj); }
176
177 jclass to_jclass(Klass* klass) { return (klass == nullptr ? nullptr : (jclass)to_jobject(klass->java_mirror())); }
178
179 jmethodID to_jmethodID(const methodHandle& method) { return method->jmethod_id(); }
180
181 JNIEnv* jni_env() { return _jni_env; }
182 };
183
184 class JvmtiThreadEventMark : public JvmtiEventMark {
185 private:
186 jobject _jthread;
187
188 public:
189 JvmtiThreadEventMark(JavaThread *thread) :
190 JvmtiEventMark(thread) {
191 _jthread = to_jobject(thread->threadObj());
192 };
193 jthread jni_thread() { return (jthread)_jthread; }
194 };
195
196 class JvmtiVirtualThreadEventMark : public JvmtiEventMark {
197 private:
198 jobject _jthread;
199
200 public:
201 JvmtiVirtualThreadEventMark(JavaThread *thread) :
202 JvmtiEventMark(thread) {
203 assert(thread->vthread() != nullptr || thread->threadObj() == nullptr, "sanity check");
204 _jthread = to_jobject(thread->vthread());
205 };
206 jthread jni_thread() { return (jthread)_jthread; }
207 };
208
209 class JvmtiClassEventMark : public JvmtiVirtualThreadEventMark {
210 private:
211 jclass _jc;
212
213 public:
214 JvmtiClassEventMark(JavaThread *thread, Klass* klass) :
215 JvmtiVirtualThreadEventMark(thread) {
216 _jc = to_jclass(klass);
217 };
218 jclass jni_class() { return _jc; }
219 };
220
221 class JvmtiMethodEventMark : public JvmtiVirtualThreadEventMark {
222 private:
223 jmethodID _mid;
224
225 public:
226 JvmtiMethodEventMark(JavaThread *thread, const methodHandle& method) :
227 JvmtiVirtualThreadEventMark(thread),
228 _mid(to_jmethodID(method)) {};
229 jmethodID jni_methodID() { return _mid; }
230 };
231
232 class JvmtiLocationEventMark : public JvmtiMethodEventMark {
233 private:
234 jlocation _loc;
235
236 public:
237 JvmtiLocationEventMark(JavaThread *thread, const methodHandle& method, address location) :
238 JvmtiMethodEventMark(thread, method),
239 _loc(location - method->code_base()) {};
240 jlocation location() { return _loc; }
241 };
242
243 class JvmtiExceptionEventMark : public JvmtiLocationEventMark {
244 private:
245 jobject _exc;
246
247 public:
248 JvmtiExceptionEventMark(JavaThread *thread, const methodHandle& method, address location, Handle exception) :
249 JvmtiLocationEventMark(thread, method, location),
250 _exc(to_jobject(exception())) {};
251 jobject exception() { return _exc; }
252 };
253
254 class JvmtiClassFileLoadEventMark : public JvmtiThreadEventMark {
255 private:
256 const char *_class_name;
257 jobject _jloader;
258 jobject _protection_domain;
259 jclass _class_being_redefined;
260
261 public:
262 JvmtiClassFileLoadEventMark(JavaThread *thread, Symbol* name,
263 Handle class_loader, Handle prot_domain, Klass* class_being_redefined) : JvmtiThreadEventMark(thread) {
264 _class_name = name != nullptr? name->as_utf8() : nullptr;
265 _jloader = (jobject)to_jobject(class_loader());
266 _protection_domain = (jobject)to_jobject(prot_domain());
267 if (class_being_redefined == nullptr) {
268 _class_being_redefined = nullptr;
269 } else {
270 _class_being_redefined = (jclass)to_jclass(class_being_redefined);
271 }
272 };
273 const char *class_name() {
274 return _class_name;
275 }
276 jobject jloader() {
277 return _jloader;
278 }
279 jobject protection_domain() {
280 return _protection_domain;
281 }
282 jclass class_being_redefined() {
283 return _class_being_redefined;
284 }
285 };
286
287 //////////////////////////////////////////////////////////////////////////////
288
289 int JvmtiExport::_field_access_count = 0;
290 int JvmtiExport::_field_modification_count = 0;
291
292 bool JvmtiExport::_can_access_local_variables = false;
293 bool JvmtiExport::_can_hotswap_or_post_breakpoint = false;
294 bool JvmtiExport::_can_modify_any_class = false;
295 bool JvmtiExport::_can_walk_any_space = false;
296
297 uint64_t JvmtiExport::_redefinition_count = 0;
298 bool JvmtiExport::_all_dependencies_are_recorded = false;
299
300 //
301 // field access management
302 //
303
304 // interpreter generator needs the address of the counter
305 address JvmtiExport::get_field_access_count_addr() {
306 // We don't grab a lock because we don't want to
307 // serialize field access between all threads. This means that a
308 // thread on another processor can see the wrong count value and
309 // may either miss making a needed call into post_field_access()
310 // or will make an unneeded call into post_field_access(). We pay
311 // this price to avoid slowing down the VM when we aren't watching
312 // field accesses.
313 // Other access/mutation safe by virtue of being in VM state.
314 return (address)(&_field_access_count);
315 }
316
317 //
318 // field modification management
319 //
320
321 // interpreter generator needs the address of the counter
322 address JvmtiExport::get_field_modification_count_addr() {
323 // We don't grab a lock because we don't
324 // want to serialize field modification between all threads. This
325 // means that a thread on another processor can see the wrong
326 // count value and may either miss making a needed call into
327 // post_field_modification() or will make an unneeded call into
328 // post_field_modification(). We pay this price to avoid slowing
329 // down the VM when we aren't watching field modifications.
330 // Other access/mutation safe by virtue of being in VM state.
331 return (address)(&_field_modification_count);
332 }
333
334
335 ///////////////////////////////////////////////////////////////
336 // Functions needed by java.lang.instrument for starting up javaagent.
337 ///////////////////////////////////////////////////////////////
338
339 jint
340 JvmtiExport::get_jvmti_interface(JavaVM *jvm, void **penv, jint version) {
341 // The JVMTI_VERSION_INTERFACE_JVMTI part of the version number
342 // has already been validated in JNI GetEnv().
343 int major, minor, micro;
344
345 // micro version doesn't matter here (yet?)
346 decode_version_values(version, &major, &minor, µ);
347 switch (major) {
348 case 1:
349 switch (minor) {
350 case 0: // version 1.0.<micro> is recognized
351 case 1: // version 1.1.<micro> is recognized
352 case 2: // version 1.2.<micro> is recognized
353 break;
354
355 default:
356 return JNI_EVERSION; // unsupported minor version number
357 }
358 break;
359 case 9:
360 switch (minor) {
361 case 0: // version 9.0.<micro> is recognized
362 break;
363 default:
364 return JNI_EVERSION; // unsupported minor version number
365 }
366 break;
367 case 11:
368 switch (minor) {
369 case 0: // version 11.0.<micro> is recognized
370 break;
371 default:
372 return JNI_EVERSION; // unsupported minor version number
373 }
374 break;
375 default:
376 // Starting from 13 we do not care about minor version anymore
377 if (major < 13 || major > VM_Version::vm_major_version()) {
378 return JNI_EVERSION; // unsupported major version number
379 }
380 }
381
382 if (JvmtiEnv::get_phase() == JVMTI_PHASE_LIVE) {
383 JavaThread* current_thread = JavaThread::current();
384 // transition code: native to VM
385 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, current_thread));
386 ThreadInVMfromNative __tiv(current_thread);
387 VM_ENTRY_BASE(jvmtiEnv*, JvmtiExport::get_jvmti_interface, current_thread)
388 debug_only(VMNativeEntryWrapper __vew;)
389
390 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version);
391 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv*
392
393 if (Continuations::enabled()) {
394 // Virtual threads support for agents loaded into running VM.
395 // There is a performance impact when VTMS transitions are enabled.
396 if (!JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
397 JvmtiEnvBase::enable_virtual_threads_notify_jvmti();
398 }
399 }
400 return JNI_OK;
401
402 } else if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
403 // not live, no thread to transition
404 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version);
405 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv*
406
407 if (Continuations::enabled()) {
408 // Virtual threads support for agents loaded at startup.
409 // There is a performance impact when VTMS transitions are enabled.
410 JvmtiVTMSTransitionDisabler::set_VTMS_notify_jvmti_events(true);
411 }
412 return JNI_OK;
413
414 } else {
415 // Called at the wrong time
416 *penv = nullptr;
417 return JNI_EDETACHED;
418 }
419 }
420
421 JvmtiThreadState*
422 JvmtiExport::get_jvmti_thread_state(JavaThread *thread) {
423 assert(thread == JavaThread::current(), "must be current thread");
424 if (thread->is_vthread_mounted() && thread->jvmti_thread_state() == nullptr) {
425 JvmtiEventController::thread_started(thread);
426 }
427 return thread->jvmti_thread_state();
428 }
429
430 void
431 JvmtiExport::add_default_read_edges(Handle h_module, TRAPS) {
432 if (!Universe::is_module_initialized()) {
433 return; // extra safety
434 }
435 assert(!h_module.is_null(), "module should always be set");
436
437 // Invoke the transformedByAgent method
438 JavaValue result(T_VOID);
439 JavaCalls::call_static(&result,
440 vmClasses::module_Modules_klass(),
441 vmSymbols::transformedByAgent_name(),
442 vmSymbols::transformedByAgent_signature(),
443 h_module,
444 THREAD);
445
446 if (HAS_PENDING_EXCEPTION) {
447 LogTarget(Trace, jvmti) log;
448 LogStream log_stream(log);
449 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
450 log_stream.cr();
451 CLEAR_PENDING_EXCEPTION;
452 return;
453 }
454 }
455
456 jvmtiError
457 JvmtiExport::add_module_reads(Handle module, Handle to_module, TRAPS) {
458 if (!Universe::is_module_initialized()) {
459 return JVMTI_ERROR_NONE; // extra safety
460 }
461 assert(!module.is_null(), "module should always be set");
462 assert(!to_module.is_null(), "to_module should always be set");
463
464 // Invoke the addReads method
465 JavaValue result(T_VOID);
466 JavaCalls::call_static(&result,
467 vmClasses::module_Modules_klass(),
468 vmSymbols::addReads_name(),
469 vmSymbols::addReads_signature(),
470 module,
471 to_module,
472 THREAD);
473
474 if (HAS_PENDING_EXCEPTION) {
475 LogTarget(Trace, jvmti) log;
476 LogStream log_stream(log);
477 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
478 log_stream.cr();
479 CLEAR_PENDING_EXCEPTION;
480 return JVMTI_ERROR_INTERNAL;
481 }
482 return JVMTI_ERROR_NONE;
483 }
484
485 jvmtiError
486 JvmtiExport::add_module_exports(Handle module, Handle pkg_name, Handle to_module, TRAPS) {
487 if (!Universe::is_module_initialized()) {
488 return JVMTI_ERROR_NONE; // extra safety
489 }
490 assert(!module.is_null(), "module should always be set");
491 assert(!to_module.is_null(), "to_module should always be set");
492 assert(!pkg_name.is_null(), "pkg_name should always be set");
493
494 // Invoke the addExports method
495 JavaValue result(T_VOID);
496 JavaCalls::call_static(&result,
497 vmClasses::module_Modules_klass(),
498 vmSymbols::addExports_name(),
499 vmSymbols::addExports_signature(),
500 module,
501 pkg_name,
502 to_module,
503 THREAD);
504
505 if (HAS_PENDING_EXCEPTION) {
506 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
507 LogTarget(Trace, jvmti) log;
508 LogStream log_stream(log);
509 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
510 log_stream.cr();
511 CLEAR_PENDING_EXCEPTION;
512 if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) {
513 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
514 }
515 return JVMTI_ERROR_INTERNAL;
516 }
517 return JVMTI_ERROR_NONE;
518 }
519
520 jvmtiError
521 JvmtiExport::add_module_opens(Handle module, Handle pkg_name, Handle to_module, TRAPS) {
522 if (!Universe::is_module_initialized()) {
523 return JVMTI_ERROR_NONE; // extra safety
524 }
525 assert(!module.is_null(), "module should always be set");
526 assert(!to_module.is_null(), "to_module should always be set");
527 assert(!pkg_name.is_null(), "pkg_name should always be set");
528
529 // Invoke the addOpens method
530 JavaValue result(T_VOID);
531 JavaCalls::call_static(&result,
532 vmClasses::module_Modules_klass(),
533 vmSymbols::addOpens_name(),
534 vmSymbols::addExports_signature(),
535 module,
536 pkg_name,
537 to_module,
538 THREAD);
539
540 if (HAS_PENDING_EXCEPTION) {
541 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
542 LogTarget(Trace, jvmti) log;
543 LogStream log_stream(log);
544 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
545 log_stream.cr();
546 CLEAR_PENDING_EXCEPTION;
547 if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) {
548 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
549 }
550 return JVMTI_ERROR_INTERNAL;
551 }
552 return JVMTI_ERROR_NONE;
553 }
554
555 jvmtiError
556 JvmtiExport::add_module_uses(Handle module, Handle service, TRAPS) {
557 if (!Universe::is_module_initialized()) {
558 return JVMTI_ERROR_NONE; // extra safety
559 }
560 assert(!module.is_null(), "module should always be set");
561 assert(!service.is_null(), "service should always be set");
562
563 // Invoke the addUses method
564 JavaValue result(T_VOID);
565 JavaCalls::call_static(&result,
566 vmClasses::module_Modules_klass(),
567 vmSymbols::addUses_name(),
568 vmSymbols::addUses_signature(),
569 module,
570 service,
571 THREAD);
572
573 if (HAS_PENDING_EXCEPTION) {
574 LogTarget(Trace, jvmti) log;
575 LogStream log_stream(log);
576 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
577 log_stream.cr();
578 CLEAR_PENDING_EXCEPTION;
579 return JVMTI_ERROR_INTERNAL;
580 }
581 return JVMTI_ERROR_NONE;
582 }
583
584 jvmtiError
585 JvmtiExport::add_module_provides(Handle module, Handle service, Handle impl_class, TRAPS) {
586 if (!Universe::is_module_initialized()) {
587 return JVMTI_ERROR_NONE; // extra safety
588 }
589 assert(!module.is_null(), "module should always be set");
590 assert(!service.is_null(), "service should always be set");
591 assert(!impl_class.is_null(), "impl_class should always be set");
592
593 // Invoke the addProvides method
594 JavaValue result(T_VOID);
595 JavaCalls::call_static(&result,
596 vmClasses::module_Modules_klass(),
597 vmSymbols::addProvides_name(),
598 vmSymbols::addProvides_signature(),
599 module,
600 service,
601 impl_class,
602 THREAD);
603
604 if (HAS_PENDING_EXCEPTION) {
605 LogTarget(Trace, jvmti) log;
606 LogStream log_stream(log);
607 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
608 log_stream.cr();
609 CLEAR_PENDING_EXCEPTION;
610 return JVMTI_ERROR_INTERNAL;
611 }
612 return JVMTI_ERROR_NONE;
613 }
614
615 void
616 JvmtiExport::decode_version_values(jint version, int * major, int * minor,
617 int * micro) {
618 *major = (version & JVMTI_VERSION_MASK_MAJOR) >> JVMTI_VERSION_SHIFT_MAJOR;
619 *minor = (version & JVMTI_VERSION_MASK_MINOR) >> JVMTI_VERSION_SHIFT_MINOR;
620 *micro = (version & JVMTI_VERSION_MASK_MICRO) >> JVMTI_VERSION_SHIFT_MICRO;
621 }
622
623 void JvmtiExport::enter_primordial_phase() {
624 JvmtiEnvBase::set_phase(JVMTI_PHASE_PRIMORDIAL);
625 }
626
627 void JvmtiExport::enter_early_start_phase() {
628 set_early_vmstart_recorded(true);
629 }
630
631 void JvmtiExport::enter_start_phase() {
632 JvmtiEnvBase::set_phase(JVMTI_PHASE_START);
633 }
634
635 void JvmtiExport::enter_onload_phase() {
636 JvmtiEnvBase::set_phase(JVMTI_PHASE_ONLOAD);
637 }
638
639 void JvmtiExport::enter_live_phase() {
640 JvmtiEnvBase::set_phase(JVMTI_PHASE_LIVE);
641 }
642
643 //
644 // JVMTI events that the VM posts to the debugger and also startup agent
645 // and call the agent's premain() for java.lang.instrument.
646 //
647
648 void JvmtiExport::post_early_vm_start() {
649 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg Early VM start event triggered" ));
650
651 // can now enable some events
652 JvmtiEventController::vm_start();
653
654 JvmtiEnvIterator it;
655 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
656 // Only early vmstart envs post early VMStart event
657 if (env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) {
658 EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt Early VM start event sent" ));
659 JavaThread *thread = JavaThread::current();
660 JvmtiThreadEventMark jem(thread);
661 JvmtiJavaThreadEventTransition jet(thread);
662 jvmtiEventVMStart callback = env->callbacks()->VMStart;
663 if (callback != nullptr) {
664 (*callback)(env->jvmti_external(), jem.jni_env());
665 }
666 }
667 }
668 }
669
670 void JvmtiExport::post_vm_start() {
671 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg VM start event triggered" ));
672
673 // can now enable some events
674 JvmtiEventController::vm_start();
675
676 JvmtiEnvIterator it;
677 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
678 // Early vmstart envs do not post normal VMStart event
679 if (!env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) {
680 EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt VM start event sent" ));
681
682 JavaThread *thread = JavaThread::current();
683 JvmtiThreadEventMark jem(thread);
684 JvmtiJavaThreadEventTransition jet(thread);
685 jvmtiEventVMStart callback = env->callbacks()->VMStart;
686 if (callback != nullptr) {
687 (*callback)(env->jvmti_external(), jem.jni_env());
688 }
689 }
690 }
691 }
692
693 static OopStorage* _jvmti_oop_storage = nullptr;
694 static OopStorage* _weak_tag_storage = nullptr;
695
696 OopStorage* JvmtiExport::jvmti_oop_storage() {
697 assert(_jvmti_oop_storage != nullptr, "not yet initialized");
698 return _jvmti_oop_storage;
699 }
700
701 OopStorage* JvmtiExport::weak_tag_storage() {
702 assert(_weak_tag_storage != nullptr, "not yet initialized");
703 return _weak_tag_storage;
704 }
705
706 void JvmtiExport::initialize_oop_storage() {
707 // OopStorage needs to be created early in startup and unconditionally
708 // because of OopStorageSet static array indices.
709 _jvmti_oop_storage = OopStorageSet::create_strong("JVMTI OopStorage", mtServiceability);
710 _weak_tag_storage = OopStorageSet::create_weak("JVMTI Tag Weak OopStorage", mtServiceability);
711 _weak_tag_storage->register_num_dead_callback(&JvmtiTagMap::gc_notification);
712 }
713
714 // Lookup an agent from an JvmtiEnv. Return agent only if it is not yet initialized.
715 // An agent can create multiple JvmtiEnvs, but for agent initialization, we are only interested in the initial one.
716 static JvmtiAgent* lookup_uninitialized_agent(JvmtiEnv* env, void* callback) {
717 JvmtiAgent* const agent = JvmtiAgentList::lookup(env, callback);
718 return agent == nullptr || agent->is_initialized() ? nullptr : agent;
719 }
720
721 void JvmtiExport::post_vm_initialized() {
722 EVT_TRIG_TRACE(JVMTI_EVENT_VM_INIT, ("Trg VM init event triggered" ));
723
724 // can now enable events
725 JvmtiEventController::vm_init();
726
727 JvmtiEnvIterator it;
728 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
729 if (env->is_enabled(JVMTI_EVENT_VM_INIT)) {
730 EVT_TRACE(JVMTI_EVENT_VM_INIT, ("Evt VM init event sent" ));
731
732 JavaThread *thread = JavaThread::current();
733 JvmtiThreadEventMark jem(thread);
734 JvmtiJavaThreadEventTransition jet(thread);
735 jvmtiEventVMInit callback = env->callbacks()->VMInit;
736 if (callback != nullptr) {
737 // We map the JvmtiEnv to its Agent to measure when and for how long
738 // it took to initialize so that JFR can report this information.
739 JvmtiAgent* const agent = lookup_uninitialized_agent(env, reinterpret_cast<void*>(callback));
740 if (agent != nullptr) {
741 agent->initialization_begin();
742 }
743 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
744 if (agent != nullptr) {
745 agent->initialization_end();
746 }
747 }
748 }
749 }
750
751 // Agents are initialized as part of posting the VMInit event above.
752 // For -Xrun agents and agents with no VMInit callback, we explicitly ensure they are also initialized.
753 // JVM_OnLoad and Agent_OnLoad callouts are performed too early for the proper timestamp logic.
754 JvmtiAgentList::initialize();
755 }
756
757 void JvmtiExport::post_vm_death() {
758 EVT_TRIG_TRACE(JVMTI_EVENT_VM_DEATH, ("Trg VM death event triggered" ));
759
760 JvmtiTagMap::flush_all_object_free_events();
761
762 JvmtiEnvIterator it;
763 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
764 if (env->is_enabled(JVMTI_EVENT_VM_DEATH)) {
765 EVT_TRACE(JVMTI_EVENT_VM_DEATH, ("Evt VM death event sent" ));
766
767 JavaThread *thread = JavaThread::current();
768 JvmtiEventMark jem(thread);
769 JvmtiJavaThreadEventTransition jet(thread);
770 jvmtiEventVMDeath callback = env->callbacks()->VMDeath;
771 if (callback != nullptr) {
772 (*callback)(env->jvmti_external(), jem.jni_env());
773 }
774 }
775 }
776
777 JvmtiEnvBase::set_phase(JVMTI_PHASE_DEAD);
778 JvmtiEventController::vm_death();
779 }
780
781 char**
782 JvmtiExport::get_all_native_method_prefixes(int* count_ptr) {
783 // Have to grab JVMTI thread state lock to be sure environment doesn't
784 // go away while we iterate them. No locks during VM bring-up.
785 if (Threads::number_of_threads() == 0 || SafepointSynchronize::is_at_safepoint()) {
786 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
787 } else {
788 MutexLocker mu(JvmtiThreadState_lock);
789 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
790 }
791 }
792
793 // Convert an external thread reference to a JavaThread found on the
794 // specified ThreadsList. The ThreadsListHandle in the caller "protects"
795 // the returned JavaThread *.
796 //
797 // If thread_oop_p is not null, then the caller wants to use the oop
798 // after this call so the oop is returned. On success, *jt_pp is set
799 // to the converted JavaThread * and JVMTI_ERROR_NONE is returned.
800 // On error, returns various JVMTI_ERROR_* values.
801 //
802 jvmtiError
803 JvmtiExport::cv_external_thread_to_JavaThread(ThreadsList * t_list,
804 jthread thread,
805 JavaThread ** jt_pp,
806 oop * thread_oop_p) {
807 assert(t_list != nullptr, "must have a ThreadsList");
808 assert(jt_pp != nullptr, "must have a return JavaThread pointer");
809 // thread_oop_p is optional so no assert()
810
811 if (thread_oop_p != nullptr) {
812 *thread_oop_p = nullptr;
813 }
814
815 oop thread_oop = JNIHandles::resolve_external_guard(thread);
816 if (thread_oop == nullptr) {
817 // null jthread, GC'ed jthread or a bad JNI handle.
818 return JVMTI_ERROR_INVALID_THREAD;
819 }
820 // Looks like an oop at this point.
821
822 if (!thread_oop->is_a(vmClasses::Thread_klass())) {
823 // The oop is not a java.lang.Thread.
824 return JVMTI_ERROR_INVALID_THREAD;
825 }
826 // Looks like a java.lang.Thread oop at this point.
827
828 if (thread_oop_p != nullptr) {
829 // Return the oop to the caller; the caller may still want
830 // the oop even if this function returns an error.
831 *thread_oop_p = thread_oop;
832 }
833
834 JavaThread * java_thread = java_lang_Thread::thread(thread_oop);
835 if (java_thread == nullptr) {
836 if (java_lang_VirtualThread::is_instance(thread_oop)) {
837 return JVMTI_ERROR_INVALID_THREAD;
838 }
839 // The java.lang.Thread does not contain a JavaThread * so it has
840 // not yet run or it has died.
841 return JVMTI_ERROR_THREAD_NOT_ALIVE;
842 }
843 // Looks like a live JavaThread at this point.
844
845 if (!t_list->includes(java_thread)) {
846 // Not on the JavaThreads list so it is not alive.
847 return JVMTI_ERROR_THREAD_NOT_ALIVE;
848 }
849
850 // Return a live JavaThread that is "protected" by the
851 // ThreadsListHandle in the caller.
852 *jt_pp = java_thread;
853
854 return JVMTI_ERROR_NONE;
855 }
856
857 // Convert an oop to a JavaThread found on the specified ThreadsList.
858 // The ThreadsListHandle in the caller "protects" the returned
859 // JavaThread *.
860 //
861 // On success, *jt_pp is set to the converted JavaThread * and
862 // JVMTI_ERROR_NONE is returned. On error, returns various
863 // JVMTI_ERROR_* values.
864 //
865 jvmtiError
866 JvmtiExport::cv_oop_to_JavaThread(ThreadsList * t_list, oop thread_oop,
867 JavaThread ** jt_pp) {
868 assert(t_list != nullptr, "must have a ThreadsList");
869 assert(thread_oop != nullptr, "must have an oop");
870 assert(jt_pp != nullptr, "must have a return JavaThread pointer");
871
872 if (!thread_oop->is_a(vmClasses::Thread_klass())) {
873 // The oop is not a java.lang.Thread.
874 return JVMTI_ERROR_INVALID_THREAD;
875 }
876 // Looks like a java.lang.Thread oop at this point.
877
878 JavaThread * java_thread = java_lang_Thread::thread(thread_oop);
879 if (java_thread == nullptr) {
880 // The java.lang.Thread does not contain a JavaThread * so it has
881 // not yet run or it has died.
882 return JVMTI_ERROR_THREAD_NOT_ALIVE;
883 }
884 // Looks like a live JavaThread at this point.
885
886 if (!t_list->includes(java_thread)) {
887 // Not on the JavaThreads list so it is not alive.
888 return JVMTI_ERROR_THREAD_NOT_ALIVE;
889 }
890
891 // Return a live JavaThread that is "protected" by the
892 // ThreadsListHandle in the caller.
893 *jt_pp = java_thread;
894
895 return JVMTI_ERROR_NONE;
896 }
897
898 class JvmtiClassFileLoadHookPoster : public StackObj {
899 private:
900 Symbol* _h_name;
901 Handle _class_loader;
902 Handle _h_protection_domain;
903 unsigned char ** _data_ptr;
904 unsigned char ** _end_ptr;
905 JavaThread * _thread;
906 jint _curr_len;
907 unsigned char * _curr_data;
908 JvmtiEnv * _curr_env;
909 JvmtiCachedClassFileData ** _cached_class_file_ptr;
910 JvmtiThreadState * _state;
911 Klass* _class_being_redefined;
912 JvmtiClassLoadKind _load_kind;
913 bool _has_been_modified;
914
915 public:
916 inline JvmtiClassFileLoadHookPoster(Symbol* h_name, Handle class_loader,
917 Handle h_protection_domain,
918 unsigned char **data_ptr, unsigned char **end_ptr,
919 JvmtiCachedClassFileData **cache_ptr) {
920 _h_name = h_name;
921 _class_loader = class_loader;
922 _h_protection_domain = h_protection_domain;
923 _data_ptr = data_ptr;
924 _end_ptr = end_ptr;
925 _thread = JavaThread::current();
926 _curr_len = pointer_delta_as_int(*end_ptr, *data_ptr);
927 _curr_data = *data_ptr;
928 _curr_env = nullptr;
929 _cached_class_file_ptr = cache_ptr;
930 _has_been_modified = false;
931
932 assert(!_thread->is_in_any_VTMS_transition(), "CFLH events are not allowed in any VTMS transition");
933
934 _state = JvmtiExport::get_jvmti_thread_state(_thread);
935 if (_state != nullptr) {
936 _class_being_redefined = _state->get_class_being_redefined();
937 _load_kind = _state->get_class_load_kind();
938 Klass* klass = (_class_being_redefined == nullptr) ? nullptr : _class_being_redefined;
939 if (_load_kind != jvmti_class_load_kind_load && klass != nullptr) {
940 ModuleEntry* module_entry = InstanceKlass::cast(klass)->module();
941 assert(module_entry != nullptr, "module_entry should always be set");
942 if (module_entry->is_named() &&
943 module_entry->module() != nullptr &&
944 !module_entry->has_default_read_edges()) {
945 if (!module_entry->set_has_default_read_edges()) {
946 // We won a potential race.
947 // Add read edges to the unnamed modules of the bootstrap and app class loaders
948 Handle class_module(_thread, module_entry->module()); // Obtain j.l.r.Module
949 JvmtiExport::add_default_read_edges(class_module, _thread);
950 }
951 }
952 }
953 // Clear class_being_redefined flag here. The action
954 // from agent handler could generate a new class file load
955 // hook event and if it is not cleared the new event generated
956 // from regular class file load could have this stale redefined
957 // class handle info.
958 _state->clear_class_being_redefined();
959 } else {
960 // redefine and retransform will always set the thread state
961 _class_being_redefined = nullptr;
962 _load_kind = jvmti_class_load_kind_load;
963 }
964 }
965
966 void post() {
967 post_all_envs();
968 copy_modified_data();
969 }
970
971 bool has_been_modified() { return _has_been_modified; }
972
973 private:
974 void post_all_envs() {
975 if (_load_kind != jvmti_class_load_kind_retransform) {
976 // for class load and redefine,
977 // call the non-retransformable agents
978 JvmtiEnvIterator it;
979 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
980 if (!env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
981 // non-retransformable agents cannot retransform back,
982 // so no need to cache the original class file bytes
983 post_to_env(env, false);
984 }
985 }
986 }
987 JvmtiEnvIterator it;
988 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
989 // retransformable agents get all events
990 if (env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
991 // retransformable agents need to cache the original class file
992 // bytes if changes are made via the ClassFileLoadHook
993 post_to_env(env, true);
994 }
995 }
996 }
997
998 void post_to_env(JvmtiEnv* env, bool caching_needed) {
999 if (env->phase() == JVMTI_PHASE_PRIMORDIAL && !env->early_class_hook_env()) {
1000 return;
1001 }
1002 unsigned char *new_data = nullptr;
1003 jint new_len = 0;
1004 JvmtiClassFileLoadEventMark jem(_thread, _h_name, _class_loader,
1005 _h_protection_domain,
1006 _class_being_redefined);
1007 JvmtiJavaThreadEventTransition jet(_thread);
1008 jvmtiEventClassFileLoadHook callback = env->callbacks()->ClassFileLoadHook;
1009 if (callback != nullptr) {
1010 (*callback)(env->jvmti_external(), jem.jni_env(),
1011 jem.class_being_redefined(),
1012 jem.jloader(), jem.class_name(),
1013 jem.protection_domain(),
1014 _curr_len, _curr_data,
1015 &new_len, &new_data);
1016 }
1017 if (new_data != nullptr) {
1018 // this agent has modified class data.
1019 _has_been_modified = true;
1020 if (caching_needed && *_cached_class_file_ptr == nullptr) {
1021 // data has been changed by the new retransformable agent
1022 // and it hasn't already been cached, cache it
1023 JvmtiCachedClassFileData *p;
1024 p = (JvmtiCachedClassFileData *)os::malloc(
1025 offset_of(JvmtiCachedClassFileData, data) + _curr_len, mtInternal);
1026 if (p == nullptr) {
1027 vm_exit_out_of_memory(offset_of(JvmtiCachedClassFileData, data) + _curr_len,
1028 OOM_MALLOC_ERROR,
1029 "unable to allocate cached copy of original class bytes");
1030 }
1031 p->length = _curr_len;
1032 memcpy(p->data, _curr_data, _curr_len);
1033 *_cached_class_file_ptr = p;
1034 }
1035
1036 if (_curr_data != *_data_ptr) {
1037 // curr_data is previous agent modified class data.
1038 // And this has been changed by the new agent so
1039 // we can delete it now.
1040 _curr_env->Deallocate(_curr_data);
1041 }
1042
1043 // Class file data has changed by the current agent.
1044 _curr_data = new_data;
1045 _curr_len = new_len;
1046 // Save the current agent env we need this to deallocate the
1047 // memory allocated by this agent.
1048 _curr_env = env;
1049 }
1050 }
1051
1052 void copy_modified_data() {
1053 // if one of the agent has modified class file data.
1054 // Copy modified class data to new resources array.
1055 if (_curr_data != *_data_ptr) {
1056 *_data_ptr = NEW_RESOURCE_ARRAY(u1, _curr_len);
1057 memcpy(*_data_ptr, _curr_data, _curr_len);
1058 *_end_ptr = *_data_ptr + _curr_len;
1059 _curr_env->Deallocate(_curr_data);
1060 }
1061 }
1062 };
1063
1064 bool JvmtiExport::is_early_phase() {
1065 return JvmtiEnvBase::get_phase() <= JVMTI_PHASE_PRIMORDIAL;
1066 }
1067
1068 bool JvmtiExport::has_early_class_hook_env() {
1069 JvmtiEnvIterator it;
1070 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1071 if (env->early_class_hook_env()) {
1072 return true;
1073 }
1074 }
1075 return false;
1076 }
1077
1078 bool JvmtiExport::_should_post_class_file_load_hook = false;
1079
1080 // This flag is read by C2 during VM internal objects allocation
1081 int JvmtiExport::_should_notify_object_alloc = 0;
1082
1083 // this entry is for class file load hook on class load, redefine and retransform
1084 bool JvmtiExport::post_class_file_load_hook(Symbol* h_name,
1085 Handle class_loader,
1086 Handle h_protection_domain,
1087 unsigned char **data_ptr,
1088 unsigned char **end_ptr,
1089 JvmtiCachedClassFileData **cache_ptr) {
1090 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1091 return false;
1092 }
1093
1094 if (JavaThread::current()->is_in_any_VTMS_transition()) {
1095 return false; // no events should be posted if thread is in any VTMS transition
1096 }
1097
1098 JvmtiClassFileLoadHookPoster poster(h_name, class_loader,
1099 h_protection_domain,
1100 data_ptr, end_ptr,
1101 cache_ptr);
1102 poster.post();
1103 return poster.has_been_modified();
1104 }
1105
1106 void JvmtiExport::report_unsupported(bool on) {
1107 // If any JVMTI service is turned on, we need to exit before native code
1108 // tries to access nonexistent services.
1109 if (on) {
1110 vm_exit_during_initialization("Java Kernel does not support JVMTI.");
1111 }
1112 }
1113
1114
1115 static inline Klass* oop_to_klass(oop obj) {
1116 Klass* k = obj->klass();
1117
1118 // if the object is a java.lang.Class then return the java mirror
1119 if (k == vmClasses::Class_klass()) {
1120 if (!java_lang_Class::is_primitive(obj)) {
1121 k = java_lang_Class::as_Klass(obj);
1122 assert(k != nullptr, "class for non-primitive mirror must exist");
1123 }
1124 }
1125 return k;
1126 }
1127
1128 class JvmtiObjectAllocEventMark : public JvmtiClassEventMark {
1129 private:
1130 jobject _jobj;
1131 jlong _size;
1132 public:
1133 JvmtiObjectAllocEventMark(JavaThread *thread, oop obj) : JvmtiClassEventMark(thread, oop_to_klass(obj)) {
1134 _jobj = (jobject)to_jobject(obj);
1135 _size = obj->size() * wordSize;
1136 };
1137 jobject jni_jobject() { return _jobj; }
1138 jlong size() { return _size; }
1139 };
1140
1141 class JvmtiCompiledMethodLoadEventMark : public JvmtiMethodEventMark {
1142 private:
1143 jint _code_size;
1144 const void *_code_data;
1145 jint _map_length;
1146 jvmtiAddrLocationMap *_map;
1147 const void *_compile_info;
1148 public:
1149 JvmtiCompiledMethodLoadEventMark(JavaThread *thread, nmethod *nm, void* compile_info_ptr = nullptr)
1150 : JvmtiMethodEventMark(thread,methodHandle(thread, nm->method())) {
1151 _code_data = nm->code_begin();
1152 _code_size = nm->code_size();
1153 _compile_info = compile_info_ptr; // Set void pointer of compiledMethodLoad Event. Default value is null.
1154 JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nm, &_map, &_map_length);
1155 }
1156 ~JvmtiCompiledMethodLoadEventMark() {
1157 FREE_C_HEAP_ARRAY(jvmtiAddrLocationMap, _map);
1158 }
1159
1160 jint code_size() { return _code_size; }
1161 const void *code_data() { return _code_data; }
1162 jint map_length() { return _map_length; }
1163 const jvmtiAddrLocationMap* map() { return _map; }
1164 const void *compile_info() { return _compile_info; }
1165 };
1166
1167
1168
1169 class JvmtiMonitorEventMark : public JvmtiVirtualThreadEventMark {
1170 private:
1171 jobject _jobj;
1172 public:
1173 JvmtiMonitorEventMark(JavaThread *thread, oop object)
1174 : JvmtiVirtualThreadEventMark(thread){
1175 _jobj = to_jobject(object);
1176 }
1177 jobject jni_object() { return _jobj; }
1178 };
1179
1180 ///////////////////////////////////////////////////////////////
1181 //
1182 // pending CompiledMethodUnload support
1183 //
1184
1185 void JvmtiExport::post_compiled_method_unload(
1186 jmethodID method, const void *code_begin) {
1187 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1188 return;
1189 }
1190 JavaThread* thread = JavaThread::current();
1191 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
1192 ("[%s] method compile unload event triggered",
1193 JvmtiTrace::safe_get_thread_name(thread)));
1194
1195 // post the event for each environment that has this event enabled.
1196 JvmtiEnvIterator it;
1197 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1198 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_UNLOAD)) {
1199 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1200 continue;
1201 }
1202 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
1203 ("[%s] class compile method unload event sent jmethodID " PTR_FORMAT,
1204 JvmtiTrace::safe_get_thread_name(thread), p2i(method)));
1205
1206 ResourceMark rm(thread);
1207
1208 JvmtiEventMark jem(thread);
1209 JvmtiJavaThreadEventTransition jet(thread);
1210 jvmtiEventCompiledMethodUnload callback = env->callbacks()->CompiledMethodUnload;
1211 if (callback != nullptr) {
1212 (*callback)(env->jvmti_external(), method, code_begin);
1213 }
1214 }
1215 }
1216 }
1217
1218 ///////////////////////////////////////////////////////////////
1219 //
1220 // JvmtiExport
1221 //
1222
1223 void JvmtiExport::post_raw_breakpoint(JavaThread *thread, Method* method, address location) {
1224 HandleMark hm(thread);
1225 methodHandle mh(thread, method);
1226
1227 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1228 if (state == nullptr) {
1229 return;
1230 }
1231 if (thread->is_in_any_VTMS_transition()) {
1232 return; // no events should be posted if thread is in any VTMS transition
1233 }
1234
1235 EVT_TRIG_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Trg Breakpoint triggered",
1236 JvmtiTrace::safe_get_thread_name(thread)));
1237 JvmtiEnvThreadStateIterator it(state);
1238 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1239 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_BREAKPOINT);
1240 if (!ets->breakpoint_posted() && ets->is_enabled(JVMTI_EVENT_BREAKPOINT)) {
1241 ThreadState old_os_state = thread->osthread()->get_state();
1242 thread->osthread()->set_state(BREAKPOINTED);
1243 EVT_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Evt Breakpoint sent %s.%s @ " INTX_FORMAT,
1244 JvmtiTrace::safe_get_thread_name(thread),
1245 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1246 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
1247 location - mh()->code_base() ));
1248
1249 JvmtiEnv *env = ets->get_env();
1250 JvmtiLocationEventMark jem(thread, mh, location);
1251 JvmtiJavaThreadEventTransition jet(thread);
1252 jvmtiEventBreakpoint callback = env->callbacks()->Breakpoint;
1253 if (callback != nullptr) {
1254 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1255 jem.jni_methodID(), jem.location());
1256 }
1257
1258 ets->set_breakpoint_posted();
1259 thread->osthread()->set_state(old_os_state);
1260 }
1261 }
1262 }
1263
1264 //////////////////////////////////////////////////////////////////////////////
1265
1266 bool JvmtiExport::_can_get_source_debug_extension = false;
1267 bool JvmtiExport::_can_maintain_original_method_order = false;
1268 bool JvmtiExport::_can_post_interpreter_events = false;
1269 bool JvmtiExport::_can_post_on_exceptions = false;
1270 bool JvmtiExport::_can_post_breakpoint = false;
1271 bool JvmtiExport::_can_post_field_access = false;
1272 bool JvmtiExport::_can_post_field_modification = false;
1273 bool JvmtiExport::_can_post_method_entry = false;
1274 bool JvmtiExport::_can_post_method_exit = false;
1275 bool JvmtiExport::_can_post_frame_pop = false;
1276 bool JvmtiExport::_can_pop_frame = false;
1277 bool JvmtiExport::_can_force_early_return = false;
1278 bool JvmtiExport::_can_support_virtual_threads = false;
1279 bool JvmtiExport::_can_get_owned_monitor_info = false;
1280
1281 bool JvmtiExport::_early_vmstart_recorded = false;
1282
1283 bool JvmtiExport::_should_post_single_step = false;
1284 bool JvmtiExport::_should_post_field_access = false;
1285 bool JvmtiExport::_should_post_field_modification = false;
1286 bool JvmtiExport::_should_post_class_load = false;
1287 bool JvmtiExport::_should_post_class_prepare = false;
1288 bool JvmtiExport::_should_post_class_unload = false;
1289 bool JvmtiExport::_should_post_thread_life = false;
1290 bool JvmtiExport::_should_clean_up_heap_objects = false;
1291 bool JvmtiExport::_should_post_native_method_bind = false;
1292 bool JvmtiExport::_should_post_dynamic_code_generated = false;
1293 bool JvmtiExport::_should_post_data_dump = false;
1294 bool JvmtiExport::_should_post_compiled_method_load = false;
1295 bool JvmtiExport::_should_post_compiled_method_unload = false;
1296 bool JvmtiExport::_should_post_monitor_contended_enter = false;
1297 bool JvmtiExport::_should_post_monitor_contended_entered = false;
1298 bool JvmtiExport::_should_post_monitor_wait = false;
1299 bool JvmtiExport::_should_post_monitor_waited = false;
1300 bool JvmtiExport::_should_post_garbage_collection_start = false;
1301 bool JvmtiExport::_should_post_garbage_collection_finish = false;
1302 bool JvmtiExport::_should_post_object_free = false;
1303 bool JvmtiExport::_should_post_resource_exhausted = false;
1304 bool JvmtiExport::_should_post_vm_object_alloc = false;
1305 bool JvmtiExport::_should_post_sampled_object_alloc = false;
1306 bool JvmtiExport::_should_post_on_exceptions = false;
1307 bool JvmtiExport::_should_post_vthread_start = false;
1308 bool JvmtiExport::_should_post_vthread_end = false;
1309 bool JvmtiExport::_should_post_vthread_mount = false;
1310 bool JvmtiExport::_should_post_vthread_unmount = false;
1311
1312 ////////////////////////////////////////////////////////////////////////////////////////////////
1313
1314
1315 //
1316 // JVMTI single step management
1317 //
1318 void JvmtiExport::at_single_stepping_point(JavaThread *thread, Method* method, address location) {
1319 assert(JvmtiExport::should_post_single_step(), "must be single stepping");
1320
1321 HandleMark hm(thread);
1322 methodHandle mh(thread, method);
1323
1324 // update information about current location and post a step event
1325 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1326 if (state == nullptr) {
1327 return;
1328 }
1329 EVT_TRIG_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Trg Single Step triggered",
1330 JvmtiTrace::safe_get_thread_name(thread)));
1331 if (!state->hide_single_stepping()) {
1332 if (state->is_pending_step_for_popframe()) {
1333 state->process_pending_step_for_popframe();
1334 }
1335 if (state->is_pending_step_for_earlyret()) {
1336 state->process_pending_step_for_earlyret();
1337 }
1338 JvmtiExport::post_single_step(thread, mh(), location);
1339 }
1340 }
1341
1342
1343 void JvmtiExport::expose_single_stepping(JavaThread *thread) {
1344 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1345 if (state != nullptr) {
1346 state->clear_hide_single_stepping();
1347 }
1348 }
1349
1350
1351 bool JvmtiExport::hide_single_stepping(JavaThread *thread) {
1352 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1353 if (state != nullptr && state->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1354 state->set_hide_single_stepping();
1355 return true;
1356 } else {
1357 return false;
1358 }
1359 }
1360
1361 void JvmtiExport::post_class_load(JavaThread *thread, Klass* klass) {
1362 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1363 return;
1364 }
1365 HandleMark hm(thread);
1366
1367 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1368 if (state == nullptr) {
1369 return;
1370 }
1371 if (thread->is_in_any_VTMS_transition()) {
1372 return; // no events should be posted if thread is in any VTMS transition
1373 }
1374
1375 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Trg Class Load triggered",
1376 JvmtiTrace::safe_get_thread_name(thread)));
1377 JvmtiEnvThreadStateIterator it(state);
1378 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1379 if (ets->is_enabled(JVMTI_EVENT_CLASS_LOAD)) {
1380 JvmtiEnv *env = ets->get_env();
1381 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1382 continue;
1383 }
1384 EVT_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Evt Class Load sent %s",
1385 JvmtiTrace::safe_get_thread_name(thread),
1386 klass==nullptr? "null" : klass->external_name() ));
1387 JvmtiClassEventMark jem(thread, klass);
1388 JvmtiJavaThreadEventTransition jet(thread);
1389 jvmtiEventClassLoad callback = env->callbacks()->ClassLoad;
1390 if (callback != nullptr) {
1391 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1392 }
1393 }
1394 }
1395 }
1396
1397
1398 void JvmtiExport::post_class_prepare(JavaThread *thread, Klass* klass) {
1399 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1400 return;
1401 }
1402 HandleMark hm(thread);
1403
1404 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1405 if (state == nullptr) {
1406 return;
1407 }
1408 if (thread->is_in_any_VTMS_transition()) {
1409 return; // no events should be posted if thread is in any VTMS transition
1410 }
1411
1412 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Trg Class Prepare triggered",
1413 JvmtiTrace::safe_get_thread_name(thread)));
1414 JvmtiEnvThreadStateIterator it(state);
1415 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1416 if (ets->is_enabled(JVMTI_EVENT_CLASS_PREPARE)) {
1417 JvmtiEnv *env = ets->get_env();
1418 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1419 continue;
1420 }
1421 EVT_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Evt Class Prepare sent %s",
1422 JvmtiTrace::safe_get_thread_name(thread),
1423 klass==nullptr? "null" : klass->external_name() ));
1424 JvmtiClassEventMark jem(thread, klass);
1425 JvmtiJavaThreadEventTransition jet(thread);
1426 jvmtiEventClassPrepare callback = env->callbacks()->ClassPrepare;
1427 if (callback != nullptr) {
1428 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1429 }
1430 }
1431 }
1432 }
1433
1434 void JvmtiExport::post_class_unload(Klass* klass) {
1435 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1436 return;
1437 }
1438
1439 // postings to the service thread so that it can perform them in a safe
1440 // context and in-order.
1441 ResourceMark rm;
1442 // JvmtiDeferredEvent copies the string.
1443 JvmtiDeferredEvent event = JvmtiDeferredEvent::class_unload_event(klass->name()->as_C_string());
1444 ServiceThread::enqueue_deferred_event(&event);
1445 }
1446
1447
1448 void JvmtiExport::post_class_unload_internal(const char* name) {
1449 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1450 return;
1451 }
1452 assert(Thread::current()->is_service_thread(), "must be called from ServiceThread");
1453 JavaThread *thread = JavaThread::current();
1454 HandleMark hm(thread);
1455
1456 EVT_TRIG_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Trg Class Unload triggered" ));
1457 if (JvmtiEventController::is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1458
1459 JvmtiEnvIterator it;
1460 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1461 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1462 continue;
1463 }
1464 if (env->is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1465 EVT_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Evt Class Unload sent %s", name));
1466
1467 JvmtiEventMark jem(thread);
1468 JvmtiJavaThreadEventTransition jet(thread);
1469 jvmtiExtensionEvent callback = env->ext_callbacks()->ClassUnload;
1470 if (callback != nullptr) {
1471 (*callback)(env->jvmti_external(), jem.jni_env(), name);
1472 }
1473 }
1474 }
1475 }
1476 }
1477
1478
1479 void JvmtiExport::post_thread_start(JavaThread *thread) {
1480 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1481 return;
1482 }
1483 assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
1484
1485 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Trg Thread Start event triggered",
1486 JvmtiTrace::safe_get_thread_name(thread)));
1487
1488 // do JVMTI thread initialization (if needed)
1489 JvmtiEventController::thread_started(thread);
1490
1491 if (thread->threadObj()->is_a(vmClasses::BoundVirtualThread_klass())) {
1492 if (JvmtiExport::can_support_virtual_threads()) {
1493 // Check for VirtualThreadStart event instead.
1494 HandleMark hm(thread);
1495 Handle vthread(thread, thread->threadObj());
1496 JvmtiExport::post_vthread_start((jthread)vthread.raw_value());
1497 }
1498 return;
1499 }
1500
1501 // Do not post thread start event for hidden java thread.
1502 if (JvmtiEventController::is_enabled(JVMTI_EVENT_THREAD_START) &&
1503 !thread->is_hidden_from_external_view()) {
1504 JvmtiEnvIterator it;
1505 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1506 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1507 continue;
1508 }
1509 if (env->is_enabled(JVMTI_EVENT_THREAD_START)) {
1510 EVT_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Evt Thread Start event sent",
1511 JvmtiTrace::safe_get_thread_name(thread) ));
1512
1513 JvmtiVirtualThreadEventMark jem(thread);
1514 JvmtiJavaThreadEventTransition jet(thread);
1515 jvmtiEventThreadStart callback = env->callbacks()->ThreadStart;
1516 if (callback != nullptr) {
1517 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1518 }
1519 }
1520 }
1521 }
1522 }
1523
1524
1525 void JvmtiExport::post_thread_end(JavaThread *thread) {
1526 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1527 return;
1528 }
1529 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Trg Thread End event triggered",
1530 JvmtiTrace::safe_get_thread_name(thread)));
1531
1532 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1533 if (state == nullptr) {
1534 return;
1535 }
1536
1537 if (thread->threadObj()->is_a(vmClasses::BoundVirtualThread_klass())) {
1538 if (JvmtiExport::can_support_virtual_threads()) {
1539 // Check for VirtualThreadEnd event instead.
1540 HandleMark hm(thread);
1541 Handle vthread(thread, thread->threadObj());
1542 JvmtiExport::post_vthread_end((jthread)vthread.raw_value());
1543 }
1544 return;
1545 }
1546
1547 // Do not post thread end event for hidden java thread.
1548 if (state->is_enabled(JVMTI_EVENT_THREAD_END) &&
1549 !thread->is_hidden_from_external_view()) {
1550
1551 JvmtiEnvThreadStateIterator it(state);
1552 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1553 JvmtiEnv *env = ets->get_env();
1554 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1555 continue;
1556 }
1557 if (ets->is_enabled(JVMTI_EVENT_THREAD_END)) {
1558 EVT_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Evt Thread End event sent",
1559 JvmtiTrace::safe_get_thread_name(thread) ));
1560
1561 JvmtiVirtualThreadEventMark jem(thread);
1562 JvmtiJavaThreadEventTransition jet(thread);
1563 jvmtiEventThreadEnd callback = env->callbacks()->ThreadEnd;
1564 if (callback != nullptr) {
1565 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1566 }
1567 }
1568 }
1569 }
1570 }
1571
1572
1573 void JvmtiExport::post_vthread_start(jobject vthread) {
1574 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1575 return;
1576 }
1577 EVT_TRIG_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_START, ("[%p] Trg Virtual Thread Start event triggered", vthread));
1578
1579 JavaThread *thread = JavaThread::current();
1580 assert(!thread->is_hidden_from_external_view(), "carrier threads can't be hidden");
1581
1582 if (JvmtiEventController::is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_START)) {
1583 JvmtiEnvIterator it;
1584 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1585 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1586 continue;
1587 }
1588 if (env->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_START)) {
1589 EVT_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_START, ("[%p] Evt Virtual Thread Start event sent", vthread));
1590
1591 JvmtiVirtualThreadEventMark jem(thread);
1592 JvmtiJavaThreadEventTransition jet(thread);
1593 jvmtiEventVirtualThreadStart callback = env->callbacks()->VirtualThreadStart;
1594 if (callback != nullptr) {
1595 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1596 }
1597 }
1598 }
1599 }
1600 }
1601
1602 void JvmtiExport::post_vthread_end(jobject vthread) {
1603 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1604 return;
1605 }
1606 EVT_TRIG_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_END, ("[%p] Trg Virtual Thread End event triggered", vthread));
1607
1608 JavaThread *thread = JavaThread::current();
1609 assert(!thread->is_hidden_from_external_view(), "carrier threads can't be hidden");
1610
1611 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1612 if (state == nullptr) {
1613 return;
1614 }
1615
1616 if (state->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_END)) {
1617 JvmtiEnvThreadStateIterator it(state);
1618
1619 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1620 JvmtiEnv *env = ets->get_env();
1621 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1622 continue;
1623 }
1624 if (ets->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_END)) {
1625 EVT_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_END, ("[%p] Evt Virtual Thread End event sent", vthread));
1626
1627 JvmtiVirtualThreadEventMark jem(thread);
1628 JvmtiJavaThreadEventTransition jet(thread);
1629 jvmtiEventVirtualThreadEnd callback = env->callbacks()->VirtualThreadEnd;
1630 if (callback != nullptr) {
1631 (*callback)(env->jvmti_external(), jem.jni_env(), vthread);
1632 }
1633 }
1634 }
1635 }
1636 }
1637
1638 void JvmtiExport::post_vthread_mount(jobject vthread) {
1639 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1640 return;
1641 }
1642 JavaThread *thread = JavaThread::current();
1643 HandleMark hm(thread);
1644 EVT_TRIG_TRACE(EXT_EVENT_VIRTUAL_THREAD_MOUNT, ("[%p] Trg Virtual Thread Mount event triggered", vthread));
1645
1646 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1647 if (state == nullptr) {
1648 return;
1649 }
1650
1651 if (state->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_MOUNT)) {
1652 JvmtiEnvThreadStateIterator it(state);
1653
1654 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1655 JvmtiEnv *env = ets->get_env();
1656 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1657 continue;
1658 }
1659 if (ets->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_MOUNT)) {
1660 EVT_TRACE(EXT_EVENT_VIRTUAL_THREAD_MOUNT, ("[%p] Evt Virtual Thread Mount event sent", vthread));
1661
1662 JvmtiVirtualThreadEventMark jem(thread);
1663 JvmtiJavaThreadEventTransition jet(thread);
1664 jvmtiExtensionEvent callback = env->ext_callbacks()->VirtualThreadMount;
1665 if (callback != nullptr) {
1666 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1667 }
1668 }
1669 }
1670 }
1671 }
1672
1673 void JvmtiExport::post_vthread_unmount(jobject vthread) {
1674 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1675 return;
1676 }
1677 JavaThread *thread = JavaThread::current();
1678 HandleMark hm(thread);
1679 EVT_TRIG_TRACE(EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, ("[%p] Trg Virtual Thread Unmount event triggered", vthread));
1680
1681 // On preemption JVMTI state rebinding has already happened so get it always direclty from the oop.
1682 JvmtiThreadState *state = java_lang_Thread::jvmti_thread_state(JNIHandles::resolve(vthread));
1683 if (state == NULL) {
1684 return;
1685 }
1686
1687 if (state->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_UNMOUNT)) {
1688 JvmtiEnvThreadStateIterator it(state);
1689
1690 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1691 JvmtiEnv *env = ets->get_env();
1692 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1693 continue;
1694 }
1695 if (ets->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_UNMOUNT)) {
1696 EVT_TRACE(EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, ("[%p] Evt Virtual Thread Unmount event sent", vthread));
1697
1698 JvmtiVirtualThreadEventMark jem(thread);
1699 JvmtiJavaThreadEventTransition jet(thread);
1700 jvmtiExtensionEvent callback = env->ext_callbacks()->VirtualThreadUnmount;
1701 if (callback != nullptr) {
1702 (*callback)(env->jvmti_external(), jem.jni_env(), vthread);
1703 }
1704 }
1705 }
1706 }
1707 }
1708
1709 void JvmtiExport::continuation_yield_cleanup(JavaThread* thread, jint continuation_frame_count) {
1710 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1711 return;
1712 }
1713
1714 assert(thread == JavaThread::current(), "must be");
1715 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1716 if (state == nullptr) {
1717 return;
1718 }
1719 state->invalidate_cur_stack_depth();
1720
1721 // Clear frame_pop requests in frames popped by yield
1722 if (can_post_frame_pop()) {
1723 JvmtiEnvThreadStateIterator it(state);
1724 int top_frame_num = state->cur_stack_depth() + continuation_frame_count;
1725
1726 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1727 if (!ets->has_frame_pops()) {
1728 continue;
1729 }
1730 for (int frame_idx = 0; frame_idx < continuation_frame_count; frame_idx++) {
1731 int frame_num = top_frame_num - frame_idx;
1732
1733 if (!state->is_virtual() && ets->is_frame_pop(frame_num)) {
1734 // remove the frame's entry
1735 MutexLocker mu(JvmtiThreadState_lock);
1736 ets->clear_frame_pop(frame_num);
1737 }
1738 }
1739 }
1740 }
1741 }
1742
1743 void JvmtiExport::post_object_free(JvmtiEnv* env, GrowableArray<jlong>* objects) {
1744 assert(objects != nullptr, "Nothing to post");
1745
1746 JavaThread *javaThread = JavaThread::current();
1747 if (javaThread->is_in_any_VTMS_transition()) {
1748 return; // no events should be posted if thread is in any VTMS transition
1749 }
1750 if (!env->is_enabled(JVMTI_EVENT_OBJECT_FREE)) {
1751 return; // the event type has been already disabled
1752 }
1753
1754 EVT_TRIG_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Trg Object Free triggered" ));
1755 EVT_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Evt Object Free sent"));
1756
1757 JvmtiThreadEventMark jem(javaThread);
1758 JvmtiJavaThreadEventTransition jet(javaThread);
1759 jvmtiEventObjectFree callback = env->callbacks()->ObjectFree;
1760 if (callback != nullptr) {
1761 for (int index = 0; index < objects->length(); index++) {
1762 (*callback)(env->jvmti_external(), objects->at(index));
1763 }
1764 }
1765 }
1766
1767 void JvmtiExport::post_resource_exhausted(jint resource_exhausted_flags, const char* description) {
1768
1769 JavaThread *thread = JavaThread::current();
1770
1771 if (thread->is_in_any_VTMS_transition()) {
1772 return; // no events should be posted if thread is in any VTMS transition
1773 }
1774
1775 log_error(jvmti)("Posting Resource Exhausted event: %s",
1776 description != nullptr ? description : "unknown");
1777
1778 // JDK-8213834: handlers of ResourceExhausted may attempt some analysis
1779 // which often requires running java.
1780 // This will cause problems on threads not able to run java, e.g. compiler
1781 // threads. To forestall these problems, we therefore suppress sending this
1782 // event from threads which are not able to run java.
1783 if (!thread->can_call_java()) {
1784 return;
1785 }
1786
1787 EVT_TRIG_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Trg resource exhausted event triggered" ));
1788
1789 JvmtiEnvIterator it;
1790 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1791 if (env->is_enabled(JVMTI_EVENT_RESOURCE_EXHAUSTED)) {
1792 EVT_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Evt resource exhausted event sent" ));
1793
1794 JvmtiThreadEventMark jem(thread);
1795 JvmtiJavaThreadEventTransition jet(thread);
1796 jvmtiEventResourceExhausted callback = env->callbacks()->ResourceExhausted;
1797 if (callback != nullptr) {
1798 (*callback)(env->jvmti_external(), jem.jni_env(),
1799 resource_exhausted_flags, nullptr, description);
1800 }
1801 }
1802 }
1803 }
1804
1805 void JvmtiExport::post_method_entry(JavaThread *thread, Method* method, frame current_frame) {
1806 HandleMark hm(thread);
1807 methodHandle mh(thread, method);
1808
1809 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1810 if (state == nullptr || !state->is_interp_only_mode()) {
1811 // for any thread that actually wants method entry, interp_only_mode is set
1812 return;
1813 }
1814 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1815 return; // no events should be posted if thread is in any VTMS transition
1816 }
1817 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Trg Method Entry triggered %s.%s",
1818 JvmtiTrace::safe_get_thread_name(thread),
1819 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1820 (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1821
1822 state->incr_cur_stack_depth();
1823
1824 if (state->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1825 JvmtiEnvThreadStateIterator it(state);
1826 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1827 if (ets->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1828 EVT_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Evt Method Entry sent %s.%s",
1829 JvmtiTrace::safe_get_thread_name(thread),
1830 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1831 (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1832
1833 JvmtiEnv *env = ets->get_env();
1834 JvmtiMethodEventMark jem(thread, mh);
1835 JvmtiJavaThreadEventTransition jet(thread);
1836 jvmtiEventMethodEntry callback = env->callbacks()->MethodEntry;
1837 if (callback != nullptr) {
1838 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_methodID());
1839 }
1840 }
1841 }
1842 }
1843 }
1844
1845 void JvmtiExport::post_method_exit(JavaThread* thread, Method* method, frame current_frame) {
1846 HandleMark hm(thread);
1847 methodHandle mh(thread, method);
1848
1849 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1850
1851 if (state == nullptr || !state->is_interp_only_mode()) {
1852 // for any thread that actually wants method exit, interp_only_mode is set
1853 return;
1854 }
1855
1856 // return a flag when a method terminates by throwing an exception
1857 // i.e. if an exception is thrown and it's not caught by the current method
1858 bool exception_exit = state->is_exception_detected() && !state->is_exception_caught();
1859 Handle result;
1860 jvalue value;
1861 value.j = 0L;
1862
1863 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1864 // if the method hasn't been popped because of an exception then we populate
1865 // the return_value parameter for the callback. At this point we only have
1866 // the address of a "raw result" and we just call into the interpreter to
1867 // convert this into a jvalue.
1868 if (!exception_exit) {
1869 oop oop_result;
1870 BasicType type = current_frame.interpreter_frame_result(&oop_result, &value);
1871 if (is_reference_type(type)) {
1872 result = Handle(thread, oop_result);
1873 value.l = JNIHandles::make_local(thread, result());
1874 }
1875 }
1876 }
1877
1878 // Deferred transition to VM, so we can stash away the return oop before GC
1879 // Note that this transition is not needed when throwing an exception, because
1880 // there is no oop to retain.
1881 JavaThread* current = thread; // for JRT_BLOCK
1882 JRT_BLOCK
1883 post_method_exit_inner(thread, mh, state, exception_exit, current_frame, value);
1884 JRT_BLOCK_END
1885
1886 if (result.not_null() && !mh->is_native()) {
1887 // We have to restore the oop on the stack for interpreter frames
1888 *(oop*)current_frame.interpreter_frame_tos_address() = result();
1889 }
1890 }
1891
1892 void JvmtiExport::post_method_exit_inner(JavaThread* thread,
1893 methodHandle& mh,
1894 JvmtiThreadState *state,
1895 bool exception_exit,
1896 frame current_frame,
1897 jvalue& value) {
1898 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1899 return; // no events should be posted if thread is in any VTMS transition
1900 }
1901
1902 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Trg Method Exit triggered %s.%s",
1903 JvmtiTrace::safe_get_thread_name(thread),
1904 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1905 (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1906
1907 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1908 JvmtiEnvThreadStateIterator it(state);
1909 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1910 if (ets->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1911 EVT_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Evt Method Exit sent %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 JvmtiEnv *env = ets->get_env();
1917 JvmtiMethodEventMark jem(thread, mh);
1918 JvmtiJavaThreadEventTransition jet(thread);
1919 jvmtiEventMethodExit callback = env->callbacks()->MethodExit;
1920 if (callback != nullptr) {
1921 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1922 jem.jni_methodID(), exception_exit, value);
1923 }
1924 }
1925 }
1926 }
1927
1928 JvmtiEnvThreadStateIterator it(state);
1929 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1930 if (ets->has_frame_pops()) {
1931 int cur_frame_number = state->cur_stack_depth();
1932
1933 if (ets->is_frame_pop(cur_frame_number)) {
1934 // we have a NotifyFramePop entry for this frame.
1935 // now check that this env/thread wants this event
1936 if (ets->is_enabled(JVMTI_EVENT_FRAME_POP)) {
1937 EVT_TRACE(JVMTI_EVENT_FRAME_POP, ("[%s] Evt Frame Pop sent %s.%s",
1938 JvmtiTrace::safe_get_thread_name(thread),
1939 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1940 (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1941
1942 // we also need to issue a frame pop event for this frame
1943 JvmtiEnv *env = ets->get_env();
1944 JvmtiMethodEventMark jem(thread, mh);
1945 JvmtiJavaThreadEventTransition jet(thread);
1946 jvmtiEventFramePop callback = env->callbacks()->FramePop;
1947 if (callback != nullptr) {
1948 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1949 jem.jni_methodID(), exception_exit);
1950 }
1951 }
1952 // remove the frame's entry
1953 {
1954 MutexLocker mu(JvmtiThreadState_lock);
1955 ets->clear_frame_pop(cur_frame_number);
1956 }
1957 }
1958 }
1959 }
1960
1961 state->decr_cur_stack_depth();
1962 }
1963
1964
1965 // Todo: inline this for optimization
1966 void JvmtiExport::post_single_step(JavaThread *thread, Method* method, address location) {
1967 HandleMark hm(thread);
1968 methodHandle mh(thread, method);
1969
1970 JvmtiThreadState *state = get_jvmti_thread_state(thread);
1971 if (state == nullptr) {
1972 return;
1973 }
1974 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1975 return; // no events should be posted if thread is in any VTMS transition
1976 }
1977
1978 JvmtiEnvThreadStateIterator it(state);
1979 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1980 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_SINGLE_STEP);
1981 if (!ets->single_stepping_posted() && ets->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1982 EVT_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Evt Single Step sent %s.%s @ " INTX_FORMAT,
1983 JvmtiTrace::safe_get_thread_name(thread),
1984 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1985 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
1986 location - mh()->code_base() ));
1987
1988 JvmtiEnv *env = ets->get_env();
1989 JvmtiLocationEventMark jem(thread, mh, location);
1990 JvmtiJavaThreadEventTransition jet(thread);
1991 jvmtiEventSingleStep callback = env->callbacks()->SingleStep;
1992 if (callback != nullptr) {
1993 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1994 jem.jni_methodID(), jem.location());
1995 }
1996
1997 ets->set_single_stepping_posted();
1998 }
1999 }
2000 }
2001
2002 void JvmtiExport::post_exception_throw(JavaThread *thread, Method* method, address location, oop exception) {
2003 HandleMark hm(thread);
2004 methodHandle mh(thread, method);
2005 Handle exception_handle(thread, exception);
2006 // The KeepStackGCProcessedMark below keeps the target thread and its stack fully
2007 // GC processed across this scope. This is needed because there is a stack walk
2008 // below with safepoint polls inside of it. After such safepoints, we have to
2009 // ensure the stack is sufficiently processed.
2010 KeepStackGCProcessedMark ksgcpm(thread);
2011
2012 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2013 if (state == nullptr) {
2014 return;
2015 }
2016 if (thread->is_in_any_VTMS_transition()) {
2017 return; // no events should be posted if thread is in any VTMS transition
2018 }
2019
2020 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION, ("[%s] Trg Exception thrown triggered",
2021 JvmtiTrace::safe_get_thread_name(thread)));
2022 if (!state->is_exception_detected()) {
2023 state->set_exception_detected();
2024 JvmtiEnvThreadStateIterator it(state);
2025 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2026 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION) && (exception != nullptr)) {
2027
2028 EVT_TRACE(JVMTI_EVENT_EXCEPTION,
2029 ("[%s] Evt Exception thrown sent %s.%s @ " INTX_FORMAT,
2030 JvmtiTrace::safe_get_thread_name(thread),
2031 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2032 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2033 location - mh()->code_base() ));
2034
2035 JvmtiEnv *env = ets->get_env();
2036 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
2037
2038 // It's okay to clear these exceptions here because we duplicate
2039 // this lookup in InterpreterRuntime::exception_handler_for_exception.
2040 EXCEPTION_MARK;
2041
2042 bool should_repeat;
2043 vframeStream st(thread);
2044 assert(!st.at_end(), "cannot be at end");
2045 Method* current_method = nullptr;
2046 // A GC may occur during the Method::fast_exception_handler_bci_for()
2047 // call below if it needs to load the constraint class. Using a
2048 // methodHandle to keep the 'current_method' from being deallocated
2049 // if GC happens.
2050 methodHandle current_mh = methodHandle(thread, current_method);
2051 int current_bci = -1;
2052 do {
2053 current_method = st.method();
2054 current_mh = methodHandle(thread, current_method);
2055 current_bci = st.bci();
2056 do {
2057 should_repeat = false;
2058 Klass* eh_klass = exception_handle()->klass();
2059 current_bci = Method::fast_exception_handler_bci_for(
2060 current_mh, eh_klass, current_bci, THREAD);
2061 if (HAS_PENDING_EXCEPTION) {
2062 exception_handle = Handle(thread, PENDING_EXCEPTION);
2063 CLEAR_PENDING_EXCEPTION;
2064 should_repeat = true;
2065 }
2066 } while (should_repeat && (current_bci != -1));
2067 st.next();
2068 } while ((current_bci < 0) && (!st.at_end()));
2069
2070 jmethodID catch_jmethodID;
2071 if (current_bci < 0) {
2072 catch_jmethodID = nullptr;
2073 current_bci = 0;
2074 } else {
2075 catch_jmethodID = jem.to_jmethodID(current_mh);
2076 }
2077
2078 JvmtiJavaThreadEventTransition jet(thread);
2079 jvmtiEventException callback = env->callbacks()->Exception;
2080 if (callback != nullptr) {
2081 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2082 jem.jni_methodID(), jem.location(),
2083 jem.exception(),
2084 catch_jmethodID, current_bci);
2085 }
2086 }
2087 }
2088 }
2089
2090 // frames may get popped because of this throw, be safe - invalidate cached depth
2091 state->invalidate_cur_stack_depth();
2092 }
2093
2094
2095 void JvmtiExport::notice_unwind_due_to_exception(JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) {
2096 HandleMark hm(thread);
2097 methodHandle mh(thread, method);
2098 Handle exception_handle(thread, exception);
2099
2100 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2101 if (state == nullptr) {
2102 return;
2103 }
2104 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
2105 ("[%s] Trg unwind_due_to_exception triggered %s.%s @ %s" INTX_FORMAT " - %s",
2106 JvmtiTrace::safe_get_thread_name(thread),
2107 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2108 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2109 location == nullptr ? "no location:" : "",
2110 location == nullptr ? 0 : location - mh()->code_base(),
2111 in_handler_frame? "in handler frame" : "not handler frame" ));
2112
2113 if (state->is_exception_detected()) {
2114
2115 state->invalidate_cur_stack_depth();
2116 if (!in_handler_frame) {
2117 // Not in exception handler.
2118 if(state->is_interp_only_mode()) {
2119 // method exit and frame pop events are posted only in interp mode.
2120 // When these events are enabled code should be in running in interp mode.
2121 jvalue no_value;
2122 no_value.j = 0L;
2123 JvmtiExport::post_method_exit_inner(thread, mh, state, true, thread->last_frame(), no_value);
2124 // The cached cur_stack_depth might have changed from the
2125 // operations of frame pop or method exit. We are not 100% sure
2126 // the cached cur_stack_depth is still valid depth so invalidate
2127 // it.
2128 state->invalidate_cur_stack_depth();
2129 }
2130 } else {
2131 // In exception handler frame. Report exception catch.
2132 assert(location != nullptr, "must be a known location");
2133 // Update cur_stack_depth - the frames above the current frame
2134 // have been unwound due to this exception:
2135 assert(!state->is_exception_caught(), "exception must not be caught yet.");
2136 state->set_exception_caught();
2137
2138 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
2139 return; // no events should be posted if thread is in any VTMS transition
2140 }
2141 JvmtiEnvThreadStateIterator it(state);
2142 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2143 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION_CATCH) && (exception_handle() != nullptr)) {
2144 EVT_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
2145 ("[%s] Evt ExceptionCatch sent %s.%s @ " INTX_FORMAT,
2146 JvmtiTrace::safe_get_thread_name(thread),
2147 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2148 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2149 location - mh()->code_base() ));
2150
2151 JvmtiEnv *env = ets->get_env();
2152 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
2153 JvmtiJavaThreadEventTransition jet(thread);
2154 jvmtiEventExceptionCatch callback = env->callbacks()->ExceptionCatch;
2155 if (callback != nullptr) {
2156 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2157 jem.jni_methodID(), jem.location(),
2158 jem.exception());
2159 }
2160 }
2161 }
2162 }
2163 }
2164 }
2165
2166 oop JvmtiExport::jni_GetField_probe(JavaThread *thread, jobject jobj, oop obj,
2167 Klass* klass, jfieldID fieldID, bool is_static) {
2168 if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) {
2169 // At least one field access watch is set so we have more work to do.
2170 post_field_access_by_jni(thread, obj, klass, fieldID, is_static);
2171 // event posting can block so refetch oop if we were passed a jobj
2172 if (jobj != nullptr) return JNIHandles::resolve_non_null(jobj);
2173 }
2174 return obj;
2175 }
2176
2177 void JvmtiExport::post_field_access_by_jni(JavaThread *thread, oop obj,
2178 Klass* klass, jfieldID fieldID, bool is_static) {
2179 // We must be called with a Java context in order to provide reasonable
2180 // values for the klazz, method, and location fields. The callers of this
2181 // function don't make the call unless there is a Java context.
2182 assert(thread->has_last_Java_frame(), "must be called with a Java context");
2183
2184 if (thread->is_in_any_VTMS_transition()) {
2185 return; // no events should be posted if thread is in any VTMS transition
2186 }
2187
2188 ResourceMark rm;
2189 fieldDescriptor fd;
2190 // if get_field_descriptor finds fieldID to be invalid, then we just bail
2191 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
2192 assert(valid_fieldID == true,"post_field_access_by_jni called with invalid fieldID");
2193 if (!valid_fieldID) return;
2194 // field accesses are not watched so bail
2195 if (!fd.is_field_access_watched()) return;
2196
2197 HandleMark hm(thread);
2198 Handle h_obj;
2199 if (!is_static) {
2200 // non-static field accessors have an object, but we need a handle
2201 assert(obj != nullptr, "non-static needs an object");
2202 h_obj = Handle(thread, obj);
2203 }
2204 post_field_access(thread,
2205 thread->last_frame().interpreter_frame_method(),
2206 thread->last_frame().interpreter_frame_bcp(),
2207 klass, h_obj, fieldID);
2208 }
2209
2210 void JvmtiExport::post_field_access(JavaThread *thread, Method* method,
2211 address location, Klass* field_klass, Handle object, jfieldID field) {
2212
2213 HandleMark hm(thread);
2214 methodHandle mh(thread, method);
2215
2216 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2217 if (state == nullptr) {
2218 return;
2219 }
2220 if (thread->is_in_any_VTMS_transition()) {
2221 return; // no events should be posted if thread is in any VTMS transition
2222 }
2223
2224 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Trg Field Access event triggered",
2225 JvmtiTrace::safe_get_thread_name(thread)));
2226 JvmtiEnvThreadStateIterator it(state);
2227 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2228 if (ets->is_enabled(JVMTI_EVENT_FIELD_ACCESS)) {
2229 EVT_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Evt Field Access event sent %s.%s @ " INTX_FORMAT,
2230 JvmtiTrace::safe_get_thread_name(thread),
2231 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2232 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2233 location - mh()->code_base() ));
2234
2235 JvmtiEnv *env = ets->get_env();
2236 JvmtiLocationEventMark jem(thread, mh, location);
2237 jclass field_jclass = jem.to_jclass(field_klass);
2238 jobject field_jobject = jem.to_jobject(object());
2239 JvmtiJavaThreadEventTransition jet(thread);
2240 jvmtiEventFieldAccess callback = env->callbacks()->FieldAccess;
2241 if (callback != nullptr) {
2242 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2243 jem.jni_methodID(), jem.location(),
2244 field_jclass, field_jobject, field);
2245 }
2246 }
2247 }
2248 }
2249
2250 oop JvmtiExport::jni_SetField_probe(JavaThread *thread, jobject jobj, oop obj,
2251 Klass* klass, jfieldID fieldID, bool is_static,
2252 char sig_type, jvalue *value) {
2253 if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) {
2254 // At least one field modification watch is set so we have more work to do.
2255 post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value);
2256 // event posting can block so refetch oop if we were passed a jobj
2257 if (jobj != nullptr) return JNIHandles::resolve_non_null(jobj);
2258 }
2259 return obj;
2260 }
2261
2262 void JvmtiExport::post_field_modification_by_jni(JavaThread *thread, oop obj,
2263 Klass* klass, jfieldID fieldID, bool is_static,
2264 char sig_type, jvalue *value) {
2265 // We must be called with a Java context in order to provide reasonable
2266 // values for the klazz, method, and location fields. The callers of this
2267 // function don't make the call unless there is a Java context.
2268 assert(thread->has_last_Java_frame(), "must be called with Java context");
2269
2270 if (thread->is_in_any_VTMS_transition()) {
2271 return; // no events should be posted if thread is in any VTMS transition
2272 }
2273
2274 ResourceMark rm;
2275 fieldDescriptor fd;
2276 // if get_field_descriptor finds fieldID to be invalid, then we just bail
2277 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
2278 assert(valid_fieldID == true,"post_field_modification_by_jni called with invalid fieldID");
2279 if (!valid_fieldID) return;
2280 // field modifications are not watched so bail
2281 if (!fd.is_field_modification_watched()) return;
2282
2283 HandleMark hm(thread);
2284
2285 Handle h_obj;
2286 if (!is_static) {
2287 // non-static field accessors have an object, but we need a handle
2288 assert(obj != nullptr, "non-static needs an object");
2289 h_obj = Handle(thread, obj);
2290 }
2291 post_field_modification(thread,
2292 thread->last_frame().interpreter_frame_method(),
2293 thread->last_frame().interpreter_frame_bcp(),
2294 klass, h_obj, fieldID, sig_type, value);
2295 }
2296
2297 void JvmtiExport::post_raw_field_modification(JavaThread *thread, Method* method,
2298 address location, Klass* field_klass, Handle object, jfieldID field,
2299 char sig_type, jvalue *value) {
2300
2301 if (thread->is_in_any_VTMS_transition()) {
2302 return; // no events should be posted if thread is in any VTMS transition
2303 }
2304
2305 if (sig_type == JVM_SIGNATURE_INT || sig_type == JVM_SIGNATURE_BOOLEAN ||
2306 sig_type == JVM_SIGNATURE_BYTE || sig_type == JVM_SIGNATURE_CHAR ||
2307 sig_type == JVM_SIGNATURE_SHORT) {
2308 // 'I' instructions are used for byte, char, short and int.
2309 // determine which it really is, and convert
2310 fieldDescriptor fd;
2311 bool found = JvmtiEnv::get_field_descriptor(field_klass, field, &fd);
2312 // should be found (if not, leave as is)
2313 if (found) {
2314 jint ival = value->i;
2315 // convert value from int to appropriate type
2316 switch (fd.field_type()) {
2317 case T_BOOLEAN:
2318 sig_type = JVM_SIGNATURE_BOOLEAN;
2319 value->i = 0; // clear it
2320 value->z = (jboolean)ival;
2321 break;
2322 case T_BYTE:
2323 sig_type = JVM_SIGNATURE_BYTE;
2324 value->i = 0; // clear it
2325 value->b = (jbyte)ival;
2326 break;
2327 case T_CHAR:
2328 sig_type = JVM_SIGNATURE_CHAR;
2329 value->i = 0; // clear it
2330 value->c = (jchar)ival;
2331 break;
2332 case T_SHORT:
2333 sig_type = JVM_SIGNATURE_SHORT;
2334 value->i = 0; // clear it
2335 value->s = (jshort)ival;
2336 break;
2337 case T_INT:
2338 // nothing to do
2339 break;
2340 default:
2341 // this is an integer instruction, should be one of above
2342 ShouldNotReachHere();
2343 break;
2344 }
2345 }
2346 }
2347
2348 assert(sig_type != JVM_SIGNATURE_ARRAY, "array should have sig_type == 'L'");
2349 bool handle_created = false;
2350
2351 // convert oop to JNI handle.
2352 if (sig_type == JVM_SIGNATURE_CLASS) {
2353 handle_created = true;
2354 value->l = (jobject)JNIHandles::make_local(thread, cast_to_oop(value->l));
2355 }
2356
2357 post_field_modification(thread, method, location, field_klass, object, field, sig_type, value);
2358
2359 // Destroy the JNI handle allocated above.
2360 if (handle_created) {
2361 JNIHandles::destroy_local(value->l);
2362 }
2363 }
2364
2365 void JvmtiExport::post_field_modification(JavaThread *thread, Method* method,
2366 address location, Klass* field_klass, Handle object, jfieldID field,
2367 char sig_type, jvalue *value_ptr) {
2368
2369 HandleMark hm(thread);
2370 methodHandle mh(thread, method);
2371
2372 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2373 if (state == nullptr) {
2374 return;
2375 }
2376 if (thread->is_in_any_VTMS_transition()) {
2377 return; // no events should be posted if thread is in any VTMS transition
2378 }
2379
2380 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
2381 ("[%s] Trg Field Modification event triggered",
2382 JvmtiTrace::safe_get_thread_name(thread)));
2383 JvmtiEnvThreadStateIterator it(state);
2384 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2385 if (ets->is_enabled(JVMTI_EVENT_FIELD_MODIFICATION)) {
2386 EVT_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
2387 ("[%s] Evt Field Modification event sent %s.%s @ " INTX_FORMAT,
2388 JvmtiTrace::safe_get_thread_name(thread),
2389 (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2390 (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2391 location - mh()->code_base() ));
2392
2393 JvmtiEnv *env = ets->get_env();
2394 JvmtiLocationEventMark jem(thread, mh, location);
2395 jclass field_jclass = jem.to_jclass(field_klass);
2396 jobject field_jobject = jem.to_jobject(object());
2397 JvmtiJavaThreadEventTransition jet(thread);
2398 jvmtiEventFieldModification callback = env->callbacks()->FieldModification;
2399 if (callback != nullptr) {
2400 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2401 jem.jni_methodID(), jem.location(),
2402 field_jclass, field_jobject, field, sig_type, *value_ptr);
2403 }
2404 }
2405 }
2406 }
2407
2408 void JvmtiExport::post_native_method_bind(Method* method, address* function_ptr) {
2409 JavaThread* thread = JavaThread::current();
2410 assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
2411
2412 HandleMark hm(thread);
2413 methodHandle mh(thread, method);
2414
2415 if (thread->is_in_any_VTMS_transition()) {
2416 return; // no events should be posted if thread is in any VTMS transition
2417 }
2418 EVT_TRIG_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Trg Native Method Bind event triggered",
2419 JvmtiTrace::safe_get_thread_name(thread)));
2420
2421 if (JvmtiEventController::is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
2422 JvmtiEnvIterator it;
2423 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2424 if (env->is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
2425 EVT_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Evt Native Method Bind event sent",
2426 JvmtiTrace::safe_get_thread_name(thread) ));
2427
2428 JvmtiMethodEventMark jem(thread, mh);
2429 JvmtiJavaThreadEventTransition jet(thread);
2430 JNIEnv* jni_env = (env->phase() == JVMTI_PHASE_PRIMORDIAL) ? nullptr : jem.jni_env();
2431 jvmtiEventNativeMethodBind callback = env->callbacks()->NativeMethodBind;
2432 if (callback != nullptr) {
2433 (*callback)(env->jvmti_external(), jni_env, jem.jni_thread(),
2434 jem.jni_methodID(), (void*)(*function_ptr), (void**)function_ptr);
2435 }
2436 }
2437 }
2438 }
2439 }
2440
2441 // Returns a record containing inlining information for the given nmethod
2442 static jvmtiCompiledMethodLoadInlineRecord* create_inline_record(nmethod* nm) {
2443 jint numstackframes = 0;
2444 jvmtiCompiledMethodLoadInlineRecord* record = (jvmtiCompiledMethodLoadInlineRecord*)NEW_RESOURCE_OBJ(jvmtiCompiledMethodLoadInlineRecord);
2445 record->header.kind = JVMTI_CMLR_INLINE_INFO;
2446 record->header.next = nullptr;
2447 record->header.majorinfoversion = JVMTI_CMLR_MAJOR_VERSION_1;
2448 record->header.minorinfoversion = JVMTI_CMLR_MINOR_VERSION_0;
2449 record->numpcs = 0;
2450 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
2451 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
2452 record->numpcs++;
2453 }
2454 record->pcinfo = (PCStackInfo*)(NEW_RESOURCE_ARRAY(PCStackInfo, record->numpcs));
2455 int scope = 0;
2456 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
2457 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
2458 void* pc_address = (void*)p->real_pc(nm);
2459 assert(pc_address != nullptr, "pc_address must be non-null");
2460 record->pcinfo[scope].pc = pc_address;
2461 numstackframes=0;
2462 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != nullptr;sd = sd->sender()) {
2463 numstackframes++;
2464 }
2465 assert(numstackframes != 0, "numstackframes must be nonzero.");
2466 record->pcinfo[scope].methods = (jmethodID *)NEW_RESOURCE_ARRAY(jmethodID, numstackframes);
2467 record->pcinfo[scope].bcis = (jint *)NEW_RESOURCE_ARRAY(jint, numstackframes);
2468 record->pcinfo[scope].numstackframes = numstackframes;
2469 int stackframe = 0;
2470 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != nullptr;sd = sd->sender()) {
2471 // 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()
2472 guarantee(sd->method() != nullptr, "sd->method() cannot be null.");
2473 record->pcinfo[scope].methods[stackframe] = sd->method()->jmethod_id();
2474 record->pcinfo[scope].bcis[stackframe] = sd->bci();
2475 stackframe++;
2476 }
2477 scope++;
2478 }
2479 return record;
2480 }
2481
2482 void JvmtiExport::post_compiled_method_load(nmethod *nm) {
2483 guarantee(!nm->is_unloading(), "nmethod isn't unloaded or unloading");
2484 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
2485 return;
2486 }
2487 JavaThread* thread = JavaThread::current();
2488
2489 assert(!thread->is_in_any_VTMS_transition(), "compiled method load events are not allowed in any VTMS transition");
2490
2491 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2492 ("[%s] method compile load event triggered",
2493 JvmtiTrace::safe_get_thread_name(thread)));
2494
2495 JvmtiEnvIterator it;
2496 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2497 post_compiled_method_load(env, nm);
2498 }
2499 }
2500
2501 // post a COMPILED_METHOD_LOAD event for a given environment
2502 void JvmtiExport::post_compiled_method_load(JvmtiEnv* env, nmethod *nm) {
2503 if (env->phase() == JVMTI_PHASE_PRIMORDIAL || !env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) {
2504 return;
2505 }
2506 jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad;
2507 if (callback == nullptr) {
2508 return;
2509 }
2510 JavaThread* thread = JavaThread::current();
2511
2512 assert(!thread->is_in_any_VTMS_transition(), "compiled method load events are not allowed in any VTMS transition");
2513
2514 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2515 ("[%s] method compile load event sent %s.%s ",
2516 JvmtiTrace::safe_get_thread_name(thread),
2517 (nm->method() == nullptr) ? "null" : nm->method()->klass_name()->as_C_string(),
2518 (nm->method() == nullptr) ? "null" : nm->method()->name()->as_C_string()));
2519 ResourceMark rm(thread);
2520 HandleMark hm(thread);
2521
2522 // Add inlining information
2523 jvmtiCompiledMethodLoadInlineRecord* inlinerecord = create_inline_record(nm);
2524 // Pass inlining information through the void pointer
2525 JvmtiCompiledMethodLoadEventMark jem(thread, nm, inlinerecord);
2526 JvmtiJavaThreadEventTransition jet(thread);
2527 (*callback)(env->jvmti_external(), jem.jni_methodID(),
2528 jem.code_size(), jem.code_data(), jem.map_length(),
2529 jem.map(), jem.compile_info());
2530 }
2531
2532 void JvmtiExport::post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) {
2533 assert(name != nullptr && name[0] != '\0', "sanity check");
2534
2535 JavaThread* thread = JavaThread::current();
2536
2537 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition");
2538
2539 // In theory everyone coming thru here is in_vm but we need to be certain
2540 // because a callee will do a vm->native transition
2541 ThreadInVMfromUnknown __tiv;
2542
2543 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2544 ("[%s] method dynamic code generated event triggered",
2545 JvmtiTrace::safe_get_thread_name(thread)));
2546 JvmtiEnvIterator it;
2547 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2548 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
2549 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2550 ("[%s] dynamic code generated event sent for %s",
2551 JvmtiTrace::safe_get_thread_name(thread), name));
2552 JvmtiEventMark jem(thread);
2553 JvmtiJavaThreadEventTransition jet(thread);
2554 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
2555 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
2556 if (callback != nullptr) {
2557 (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
2558 }
2559 }
2560 }
2561 }
2562
2563 void JvmtiExport::post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) {
2564 jvmtiPhase phase = JvmtiEnv::get_phase();
2565 if (phase == JVMTI_PHASE_PRIMORDIAL || phase == JVMTI_PHASE_START) {
2566 post_dynamic_code_generated_internal(name, code_begin, code_end);
2567 } else {
2568 // It may not be safe to post the event from this thread. Defer all
2569 // postings to the service thread so that it can perform them in a safe
2570 // context and in-order.
2571 JvmtiDeferredEvent event = JvmtiDeferredEvent::dynamic_code_generated_event(
2572 name, code_begin, code_end);
2573 ServiceThread::enqueue_deferred_event(&event);
2574 }
2575 }
2576
2577
2578 // post a DYNAMIC_CODE_GENERATED event for a given environment
2579 // used by GenerateEvents
2580 void JvmtiExport::post_dynamic_code_generated(JvmtiEnv* env, const char *name,
2581 const void *code_begin, const void *code_end)
2582 {
2583 JavaThread* thread = JavaThread::current();
2584
2585 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition");
2586
2587 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2588 ("[%s] dynamic code generated event triggered (by GenerateEvents)",
2589 JvmtiTrace::safe_get_thread_name(thread)));
2590 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
2591 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2592 ("[%s] dynamic code generated event sent for %s",
2593 JvmtiTrace::safe_get_thread_name(thread), name));
2594 JvmtiEventMark jem(thread);
2595 JvmtiJavaThreadEventTransition jet(thread);
2596 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
2597 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
2598 if (callback != nullptr) {
2599 (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
2600 }
2601 }
2602 }
2603
2604 // post a DynamicCodeGenerated event while holding locks in the VM.
2605 void JvmtiExport::post_dynamic_code_generated_while_holding_locks(const char* name,
2606 address code_begin, address code_end)
2607 {
2608 JavaThread* thread = JavaThread::current();
2609 // register the stub with the current dynamic code event collector
2610 // Cannot take safepoint here so do not use state_for to get
2611 // jvmti thread state.
2612 // The collector and/or state might be null if JvmtiDynamicCodeEventCollector
2613 // has been initialized while JVMTI_EVENT_DYNAMIC_CODE_GENERATED was disabled.
2614 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2615 if (state != nullptr) {
2616 JvmtiDynamicCodeEventCollector *collector = state->get_dynamic_code_event_collector();
2617 if (collector != nullptr) {
2618 collector->register_stub(name, code_begin, code_end);
2619 }
2620 }
2621 }
2622
2623 // Collect all the vm internally allocated objects which are visible to java world
2624 void JvmtiExport::record_vm_internal_object_allocation(oop obj) {
2625 Thread* thread = Thread::current_or_null();
2626 if (thread != nullptr && thread->is_Java_thread()) {
2627 // Can not take safepoint here.
2628 NoSafepointVerifier no_sfpt;
2629 // Cannot take safepoint here so do not use state_for to get
2630 // jvmti thread state.
2631 JvmtiThreadState *state = JavaThread::cast(thread)->jvmti_thread_state();
2632 if (state != nullptr) {
2633 // state is non null when VMObjectAllocEventCollector is enabled.
2634 JvmtiVMObjectAllocEventCollector *collector;
2635 collector = state->get_vm_object_alloc_event_collector();
2636 if (collector != nullptr && collector->is_enabled()) {
2637 // Don't record classes as these will be notified via the ClassLoad
2638 // event.
2639 if (obj->klass() != vmClasses::Class_klass()) {
2640 collector->record_allocation(obj);
2641 }
2642 }
2643 }
2644 }
2645 }
2646
2647 // Collect all the sampled allocated objects.
2648 void JvmtiExport::record_sampled_internal_object_allocation(oop obj) {
2649 Thread* thread = Thread::current_or_null();
2650 if (thread != nullptr && thread->is_Java_thread()) {
2651 // Can not take safepoint here.
2652 NoSafepointVerifier no_sfpt;
2653 // Cannot take safepoint here so do not use state_for to get
2654 // jvmti thread state.
2655 JvmtiThreadState *state = JavaThread::cast(thread)->jvmti_thread_state();
2656 if (state != nullptr) {
2657 // state is non null when SampledObjectAllocEventCollector is enabled.
2658 JvmtiSampledObjectAllocEventCollector *collector;
2659 collector = state->get_sampled_object_alloc_event_collector();
2660
2661 if (collector != nullptr && collector->is_enabled()) {
2662 collector->record_allocation(obj);
2663 }
2664 }
2665 }
2666 }
2667
2668 void JvmtiExport::post_garbage_collection_finish() {
2669 Thread *thread = Thread::current(); // this event is posted from VM-Thread.
2670 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
2671 ("[%s] garbage collection finish event triggered",
2672 JvmtiTrace::safe_get_thread_name(thread)));
2673 JvmtiEnvIterator it;
2674 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2675 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH)) {
2676 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
2677 ("[%s] garbage collection finish event sent",
2678 JvmtiTrace::safe_get_thread_name(thread)));
2679 JvmtiThreadEventTransition jet(thread);
2680 // JNIEnv is null here because this event is posted from VM Thread
2681 jvmtiEventGarbageCollectionFinish callback = env->callbacks()->GarbageCollectionFinish;
2682 if (callback != nullptr) {
2683 (*callback)(env->jvmti_external());
2684 }
2685 }
2686 }
2687 }
2688
2689 void JvmtiExport::post_garbage_collection_start() {
2690 Thread* thread = Thread::current(); // this event is posted from vm-thread.
2691 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
2692 ("[%s] garbage collection start event triggered",
2693 JvmtiTrace::safe_get_thread_name(thread)));
2694 JvmtiEnvIterator it;
2695 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2696 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_START)) {
2697 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
2698 ("[%s] garbage collection start event sent",
2699 JvmtiTrace::safe_get_thread_name(thread)));
2700 JvmtiThreadEventTransition jet(thread);
2701 // JNIEnv is null here because this event is posted from VM Thread
2702 jvmtiEventGarbageCollectionStart callback = env->callbacks()->GarbageCollectionStart;
2703 if (callback != nullptr) {
2704 (*callback)(env->jvmti_external());
2705 }
2706 }
2707 }
2708 }
2709
2710 void JvmtiExport::post_data_dump() {
2711 Thread *thread = Thread::current();
2712 EVT_TRIG_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
2713 ("[%s] data dump request event triggered",
2714 JvmtiTrace::safe_get_thread_name(thread)));
2715 JvmtiEnvIterator it;
2716 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2717 if (env->is_enabled(JVMTI_EVENT_DATA_DUMP_REQUEST)) {
2718 EVT_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
2719 ("[%s] data dump request event sent",
2720 JvmtiTrace::safe_get_thread_name(thread)));
2721 JvmtiThreadEventTransition jet(thread);
2722 // JNIEnv is null here because this event is posted from VM Thread
2723 jvmtiEventDataDumpRequest callback = env->callbacks()->DataDumpRequest;
2724 if (callback != nullptr) {
2725 (*callback)(env->jvmti_external());
2726 }
2727 }
2728 }
2729 }
2730
2731 void JvmtiExport::post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) {
2732 oop object = obj_mntr->object();
2733 HandleMark hm(thread);
2734 Handle h(thread, object);
2735
2736 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2737 if (state == nullptr) {
2738 return;
2739 }
2740 if (thread->is_in_any_VTMS_transition()) {
2741 return; // no events should be posted if thread is in any VTMS transition
2742 }
2743
2744 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2745 ("[%s] monitor contended enter event triggered",
2746 JvmtiTrace::safe_get_thread_name(thread)));
2747 JvmtiEnvThreadStateIterator it(state);
2748 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2749 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTER)) {
2750 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2751 ("[%s] monitor contended enter event sent",
2752 JvmtiTrace::safe_get_thread_name(thread)));
2753 JvmtiMonitorEventMark jem(thread, h());
2754 JvmtiEnv *env = ets->get_env();
2755 JvmtiThreadEventTransition jet(thread);
2756 jvmtiEventMonitorContendedEnter callback = env->callbacks()->MonitorContendedEnter;
2757 if (callback != nullptr) {
2758 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2759 }
2760 }
2761 }
2762 }
2763
2764 void JvmtiExport::post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) {
2765 oop object = obj_mntr->object();
2766 HandleMark hm(thread);
2767 Handle h(thread, object);
2768
2769 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2770 if (state == nullptr) {
2771 return;
2772 }
2773 if (thread->is_in_any_VTMS_transition()) {
2774 return; // no events should be posted if thread is in any VTMS transition
2775 }
2776
2777 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2778 ("[%s] monitor contended entered event triggered",
2779 JvmtiTrace::safe_get_thread_name(thread)));
2780
2781 JvmtiEnvThreadStateIterator it(state);
2782 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2783 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED)) {
2784 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2785 ("[%s] monitor contended enter event sent",
2786 JvmtiTrace::safe_get_thread_name(thread)));
2787 JvmtiMonitorEventMark jem(thread, h());
2788 JvmtiEnv *env = ets->get_env();
2789 JvmtiThreadEventTransition jet(thread);
2790 jvmtiEventMonitorContendedEntered callback = env->callbacks()->MonitorContendedEntered;
2791 if (callback != nullptr) {
2792 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2793 }
2794 }
2795 }
2796 }
2797
2798 void JvmtiExport::post_monitor_wait(JavaThread *thread, oop object,
2799 jlong timeout) {
2800 HandleMark hm(thread);
2801 Handle h(thread, object);
2802
2803 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2804 if (state == nullptr) {
2805 return;
2806 }
2807 if (thread->is_in_any_VTMS_transition()) {
2808 return; // no events should be posted if thread is in any VTMS transition
2809 }
2810
2811 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2812 ("[%s] monitor wait event triggered",
2813 JvmtiTrace::safe_get_thread_name(thread)));
2814 JvmtiEnvThreadStateIterator it(state);
2815 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2816 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAIT)) {
2817 EVT_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2818 ("[%s] monitor wait event sent",
2819 JvmtiTrace::safe_get_thread_name(thread)));
2820 JvmtiMonitorEventMark jem(thread, h());
2821 JvmtiEnv *env = ets->get_env();
2822 JvmtiThreadEventTransition jet(thread);
2823 jvmtiEventMonitorWait callback = env->callbacks()->MonitorWait;
2824 if (callback != nullptr) {
2825 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2826 jem.jni_object(), timeout);
2827 }
2828 }
2829 }
2830 }
2831
2832 void JvmtiExport::post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) {
2833 oop object = obj_mntr->object();
2834 HandleMark hm(thread);
2835 Handle h(thread, object);
2836
2837 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2838 if (state == nullptr) {
2839 return;
2840 }
2841 if (thread->is_in_any_VTMS_transition()) {
2842 return; // no events should be posted if thread is in any VTMS transition
2843 }
2844
2845 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2846 ("[%s] monitor waited event triggered",
2847 JvmtiTrace::safe_get_thread_name(thread)));
2848 JvmtiEnvThreadStateIterator it(state);
2849 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2850 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAITED)) {
2851 EVT_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2852 ("[%s] monitor waited event sent",
2853 JvmtiTrace::safe_get_thread_name(thread)));
2854 JvmtiMonitorEventMark jem(thread, h());
2855 JvmtiEnv *env = ets->get_env();
2856 JvmtiThreadEventTransition jet(thread);
2857 jvmtiEventMonitorWaited callback = env->callbacks()->MonitorWaited;
2858 if (callback != nullptr) {
2859 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2860 jem.jni_object(), timed_out);
2861 }
2862 }
2863 }
2864 }
2865
2866 void JvmtiExport::vthread_post_monitor_waited(JavaThread *current, ObjectMonitor *obj_mntr, jboolean timed_out) {
2867 Handle vthread(current, current->vthread());
2868
2869 // Finish the VTMS transition temporarily to post the event.
2870 current->rebind_to_jvmti_thread_state_of(vthread());
2871 {
2872 MutexLocker mu(JvmtiThreadState_lock);
2873 JvmtiThreadState* state = current->jvmti_thread_state();
2874 if (state != NULL && state->is_pending_interp_only_mode()) {
2875 JvmtiEventController::enter_interp_only_mode(state);
2876 }
2877 }
2878 assert(current->is_in_VTMS_transition(), "sanity check");
2879 assert(!current->is_in_tmp_VTMS_transition(), "sanity check");
2880 JvmtiVTMSTransitionDisabler::finish_VTMS_transition((jthread)vthread.raw_value(), /* is_mount */ true);
2881
2882 // Post event.
2883 JvmtiExport::post_monitor_waited(current, obj_mntr, timed_out);
2884
2885 // Go back to VTMS transition state.
2886 JvmtiVTMSTransitionDisabler::start_VTMS_transition((jthread)vthread.raw_value(), /* is_mount */ true);
2887 current->rebind_to_jvmti_thread_state_of(current->threadObj());
2888 }
2889
2890 void JvmtiExport::post_vm_object_alloc(JavaThread *thread, oop object) {
2891 if (object == nullptr) {
2892 return;
2893 }
2894 if (thread->is_in_any_VTMS_transition()) {
2895 return; // no events should be posted if thread is in any VTMS transition
2896 }
2897 HandleMark hm(thread);
2898 Handle h(thread, object);
2899
2900 EVT_TRIG_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Trg vm object alloc triggered",
2901 JvmtiTrace::safe_get_thread_name(thread)));
2902 JvmtiEnvIterator it;
2903 for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2904 if (env->is_enabled(JVMTI_EVENT_VM_OBJECT_ALLOC)) {
2905 EVT_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Evt vmobject alloc sent %s",
2906 JvmtiTrace::safe_get_thread_name(thread),
2907 object==nullptr? "null" : object->klass()->external_name()));
2908
2909 JvmtiObjectAllocEventMark jem(thread, h());
2910 JvmtiJavaThreadEventTransition jet(thread);
2911 jvmtiEventVMObjectAlloc callback = env->callbacks()->VMObjectAlloc;
2912 if (callback != nullptr) {
2913 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2914 jem.jni_jobject(), jem.jni_class(), jem.size());
2915 }
2916 }
2917 }
2918 }
2919
2920 void JvmtiExport::post_sampled_object_alloc(JavaThread *thread, oop object) {
2921 HandleMark hm(thread);
2922 Handle h(thread, object);
2923
2924 JvmtiThreadState *state = get_jvmti_thread_state(thread);
2925 if (state == nullptr) {
2926 return;
2927 }
2928 if (object == nullptr) {
2929 return;
2930 }
2931 if (thread->is_in_any_VTMS_transition()) {
2932 return; // no events should be posted if thread is in any VTMS transition
2933 }
2934
2935 EVT_TRIG_TRACE(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC,
2936 ("[%s] Trg sampled object alloc triggered",
2937 JvmtiTrace::safe_get_thread_name(thread)));
2938 JvmtiEnvThreadStateIterator it(state);
2939 for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2940 if (ets->is_enabled(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC)) {
2941 EVT_TRACE(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC,
2942 ("[%s] Evt sampled object alloc sent %s",
2943 JvmtiTrace::safe_get_thread_name(thread),
2944 object == nullptr ? "null" : object->klass()->external_name()));
2945
2946 JvmtiEnv *env = ets->get_env();
2947 JvmtiObjectAllocEventMark jem(thread, h());
2948 JvmtiJavaThreadEventTransition jet(thread);
2949 jvmtiEventSampledObjectAlloc callback = env->callbacks()->SampledObjectAlloc;
2950 if (callback != nullptr) {
2951 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2952 jem.jni_jobject(), jem.jni_class(), jem.size());
2953 }
2954 }
2955 }
2956 }
2957
2958 ////////////////////////////////////////////////////////////////////////////////////////////////
2959
2960 void JvmtiExport::cleanup_thread(JavaThread* thread) {
2961 assert(JavaThread::current() == thread, "thread is not current");
2962 MutexLocker mu(thread, JvmtiThreadState_lock);
2963
2964 if (thread->jvmti_thread_state() != nullptr) {
2965 // This has to happen after the thread state is removed, which is
2966 // why it is not in post_thread_end_event like its complement
2967 // Maybe both these functions should be rolled into the posts?
2968 JvmtiEventController::thread_ended(thread);
2969 }
2970 }
2971
2972 void JvmtiExport::clear_detected_exception(JavaThread* thread) {
2973 assert(JavaThread::current() == thread, "thread is not current");
2974
2975 JvmtiThreadState* state = thread->jvmti_thread_state();
2976 if (state != nullptr) {
2977 state->clear_exception_state();
2978 }
2979 }
2980
2981 // Onload raw monitor transition.
2982 void JvmtiExport::transition_pending_onload_raw_monitors() {
2983 JvmtiPendingMonitors::transition_raw_monitors();
2984 }
2985
2986 // Setup current current thread for event collection.
2987 void JvmtiEventCollector::setup_jvmti_thread_state() {
2988 // set this event collector to be the current one.
2989 JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current());
2990 // state can only be null if the current thread is exiting which
2991 // should not happen since we're trying to configure for event collection
2992 guarantee(state != nullptr, "exiting thread called setup_jvmti_thread_state");
2993 if (is_vm_object_alloc_event()) {
2994 JvmtiVMObjectAllocEventCollector *prev = state->get_vm_object_alloc_event_collector();
2995
2996 // If we have a previous collector and it is disabled, it means this allocation came from a
2997 // callback induced VM Object allocation, do not register this collector then.
2998 if (prev && !prev->is_enabled()) {
2999 return;
3000 }
3001 _prev = prev;
3002 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)this);
3003 } else if (is_dynamic_code_event()) {
3004 _prev = state->get_dynamic_code_event_collector();
3005 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)this);
3006 } else if (is_sampled_object_alloc_event()) {
3007 JvmtiSampledObjectAllocEventCollector *prev = state->get_sampled_object_alloc_event_collector();
3008
3009 if (prev) {
3010 // JvmtiSampledObjectAllocEventCollector wants only one active collector
3011 // enabled. This allows to have a collector detect a user code requiring
3012 // a sample in the callback.
3013 return;
3014 }
3015 state->set_sampled_object_alloc_event_collector((JvmtiSampledObjectAllocEventCollector*) this);
3016 }
3017
3018 _unset_jvmti_thread_state = true;
3019 }
3020
3021 // Unset current event collection in this thread and reset it with previous
3022 // collector.
3023 void JvmtiEventCollector::unset_jvmti_thread_state() {
3024 if (!_unset_jvmti_thread_state) {
3025 return;
3026 }
3027
3028 JvmtiThreadState* state = JavaThread::current()->jvmti_thread_state();
3029 if (state != nullptr) {
3030 // restore the previous event collector (if any)
3031 if (is_vm_object_alloc_event()) {
3032 if (state->get_vm_object_alloc_event_collector() == this) {
3033 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)_prev);
3034 } else {
3035 // this thread's jvmti state was created during the scope of
3036 // the event collector.
3037 }
3038 } else if (is_dynamic_code_event()) {
3039 if (state->get_dynamic_code_event_collector() == this) {
3040 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)_prev);
3041 } else {
3042 // this thread's jvmti state was created during the scope of
3043 // the event collector.
3044 }
3045 } else if (is_sampled_object_alloc_event()) {
3046 if (state->get_sampled_object_alloc_event_collector() == this) {
3047 state->set_sampled_object_alloc_event_collector((JvmtiSampledObjectAllocEventCollector*)_prev);
3048 } else {
3049 // this thread's jvmti state was created during the scope of
3050 // the event collector.
3051 }
3052 }
3053 }
3054 }
3055
3056 // create the dynamic code event collector
3057 JvmtiDynamicCodeEventCollector::JvmtiDynamicCodeEventCollector() : _code_blobs(nullptr) {
3058 if (JvmtiExport::should_post_dynamic_code_generated()) {
3059 setup_jvmti_thread_state();
3060 }
3061 }
3062
3063 // iterate over any code blob descriptors collected and post a
3064 // DYNAMIC_CODE_GENERATED event to the profiler.
3065 JvmtiDynamicCodeEventCollector::~JvmtiDynamicCodeEventCollector() {
3066 assert(!JavaThread::current()->owns_locks(), "all locks must be released to post deferred events");
3067 // iterate over any code blob descriptors that we collected
3068 if (_code_blobs != nullptr) {
3069 for (int i=0; i<_code_blobs->length(); i++) {
3070 JvmtiCodeBlobDesc* blob = _code_blobs->at(i);
3071 JvmtiExport::post_dynamic_code_generated(blob->name(), blob->code_begin(), blob->code_end());
3072 FreeHeap(blob);
3073 }
3074 delete _code_blobs;
3075 }
3076 unset_jvmti_thread_state();
3077 }
3078
3079 // register a stub
3080 void JvmtiDynamicCodeEventCollector::register_stub(const char* name, address start, address end) {
3081 if (_code_blobs == nullptr) {
3082 _code_blobs = new (mtServiceability) GrowableArray<JvmtiCodeBlobDesc*>(1, mtServiceability);
3083 }
3084 _code_blobs->append(new JvmtiCodeBlobDesc(name, start, end));
3085 }
3086
3087 // Setup current thread to record vm allocated objects.
3088 JvmtiObjectAllocEventCollector::JvmtiObjectAllocEventCollector() :
3089 _allocated(nullptr), _enable(false), _post_callback(nullptr) {
3090 }
3091
3092 // Post vm_object_alloc event for vm allocated objects visible to java
3093 // world.
3094 void JvmtiObjectAllocEventCollector::generate_call_for_allocated() {
3095 if (_allocated) {
3096 set_enabled(false);
3097 for (int i = 0; i < _allocated->length(); i++) {
3098 oop obj = _allocated->at(i).resolve();
3099 _post_callback(JavaThread::current(), obj);
3100 // Release OopHandle
3101 _allocated->at(i).release(JvmtiExport::jvmti_oop_storage());
3102
3103 }
3104 delete _allocated, _allocated = nullptr;
3105 }
3106 }
3107
3108 void JvmtiObjectAllocEventCollector::record_allocation(oop obj) {
3109 assert(is_enabled(), "Object alloc event collector is not enabled");
3110 if (_allocated == nullptr) {
3111 _allocated = new (mtServiceability) GrowableArray<OopHandle>(1, mtServiceability);
3112 }
3113 _allocated->push(OopHandle(JvmtiExport::jvmti_oop_storage(), obj));
3114 }
3115
3116 // Disable collection of VMObjectAlloc events
3117 NoJvmtiVMObjectAllocMark::NoJvmtiVMObjectAllocMark() : _collector(nullptr) {
3118 // a no-op if VMObjectAlloc event is not enabled
3119 if (!JvmtiExport::should_post_vm_object_alloc()) {
3120 return;
3121 }
3122 Thread* thread = Thread::current_or_null();
3123 if (thread != nullptr && thread->is_Java_thread()) {
3124 JavaThread* current_thread = JavaThread::cast(thread);
3125 JvmtiThreadState *state = current_thread->jvmti_thread_state();
3126 if (state != nullptr) {
3127 JvmtiVMObjectAllocEventCollector *collector;
3128 collector = state->get_vm_object_alloc_event_collector();
3129 if (collector != nullptr && collector->is_enabled()) {
3130 _collector = collector;
3131 _collector->set_enabled(false);
3132 }
3133 }
3134 }
3135 }
3136
3137 // Re-Enable collection of VMObjectAlloc events (if previously enabled)
3138 NoJvmtiVMObjectAllocMark::~NoJvmtiVMObjectAllocMark() {
3139 if (was_enabled()) {
3140 _collector->set_enabled(true);
3141 }
3142 };
3143
3144 // Setup current thread to record vm allocated objects.
3145 JvmtiVMObjectAllocEventCollector::JvmtiVMObjectAllocEventCollector() {
3146 if (JvmtiExport::should_post_vm_object_alloc()) {
3147 _enable = true;
3148 setup_jvmti_thread_state();
3149 _post_callback = JvmtiExport::post_vm_object_alloc;
3150 }
3151 }
3152
3153 JvmtiVMObjectAllocEventCollector::~JvmtiVMObjectAllocEventCollector() {
3154 if (_enable) {
3155 generate_call_for_allocated();
3156 }
3157 unset_jvmti_thread_state();
3158 }
3159
3160 bool JvmtiSampledObjectAllocEventCollector::object_alloc_is_safe_to_sample() {
3161 Thread* thread = Thread::current();
3162 // Really only sample allocations if this is a JavaThread and not the compiler
3163 // thread.
3164 if (!thread->is_Java_thread() || thread->is_Compiler_thread()) {
3165 return false;
3166 }
3167
3168 // If the current thread is attaching from native and its Java thread object
3169 // is being allocated, things are not ready for allocation sampling.
3170 JavaThread* jt = JavaThread::cast(thread);
3171 if (jt->is_attaching_via_jni() && jt->threadObj() == nullptr) {
3172 return false;
3173 }
3174
3175 return true;
3176 }
3177
3178 // Setup current thread to record sampled allocated objects.
3179 void JvmtiSampledObjectAllocEventCollector::start() {
3180 if (JvmtiExport::should_post_sampled_object_alloc()) {
3181 if (!object_alloc_is_safe_to_sample()) {
3182 return;
3183 }
3184
3185 _enable = true;
3186 setup_jvmti_thread_state();
3187 _post_callback = JvmtiExport::post_sampled_object_alloc;
3188 }
3189 }
3190
3191 JvmtiSampledObjectAllocEventCollector::~JvmtiSampledObjectAllocEventCollector() {
3192 if (!_enable) {
3193 return;
3194 }
3195
3196 generate_call_for_allocated();
3197 unset_jvmti_thread_state();
3198
3199 // Unset the sampling collector as present in assertion mode only.
3200 assert(Thread::current()->is_Java_thread(),
3201 "Should always be in a Java thread");
3202 }
3203
3204 JvmtiGCMarker::JvmtiGCMarker() {
3205 // if there aren't any JVMTI environments then nothing to do
3206 if (!JvmtiEnv::environments_might_exist()) {
3207 return;
3208 }
3209
3210 if (JvmtiExport::should_post_garbage_collection_start()) {
3211 JvmtiExport::post_garbage_collection_start();
3212 }
3213
3214 if (SafepointSynchronize::is_at_safepoint()) {
3215 // Do clean up tasks that need to be done at a safepoint
3216 JvmtiEnvBase::check_for_periodic_clean_up();
3217 }
3218 }
3219
3220 JvmtiGCMarker::~JvmtiGCMarker() {
3221 // if there aren't any JVMTI environments then nothing to do
3222 if (!JvmtiEnv::environments_might_exist()) {
3223 return;
3224 }
3225
3226 // JVMTI notify gc finish
3227 if (JvmtiExport::should_post_garbage_collection_finish()) {
3228 JvmtiExport::post_garbage_collection_finish();
3229 }
3230 }