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