1 /*
2 * Copyright (c) 2003, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/moduleEntry.hpp"
28 #include "classfile/vmClasses.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/pcDesc.hpp"
32 #include "code/scopeDesc.hpp"
33 #include "gc/shared/oopStorageSet.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "jvmtifiles/jvmtiEnv.hpp"
36 #include "logging/log.hpp"
37 #include "logging/logStream.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "memory/universe.hpp"
41 #include "oops/klass.inline.hpp"
42 #include "oops/objArrayKlass.hpp"
43 #include "oops/objArrayOop.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "oops/oopHandle.inline.hpp"
46 #include "prims/jvmtiCodeBlobEvents.hpp"
47 #include "prims/jvmtiEventController.hpp"
48 #include "prims/jvmtiEventController.inline.hpp"
49 #include "prims/jvmtiExport.hpp"
50 #include "prims/jvmtiImpl.hpp"
51 #include "prims/jvmtiManageCapabilities.hpp"
52 #include "prims/jvmtiRawMonitor.hpp"
53 #include "prims/jvmtiRedefineClasses.hpp"
54 #include "prims/jvmtiTagMap.hpp"
55 #include "prims/jvmtiThreadState.inline.hpp"
56 #include "runtime/arguments.hpp"
57 #include "runtime/fieldDescriptor.inline.hpp"
58 #include "runtime/handles.inline.hpp"
59 #include "runtime/interfaceSupport.inline.hpp"
60 #include "runtime/javaCalls.hpp"
61 #include "runtime/javaThread.hpp"
62 #include "runtime/jniHandles.inline.hpp"
63 #include "runtime/objectMonitor.hpp"
64 #include "runtime/objectMonitor.inline.hpp"
65 #include "runtime/os.hpp"
66 #include "runtime/osThread.hpp"
67 #include "runtime/safepointVerifiers.hpp"
68 #include "runtime/serviceThread.hpp"
69 #include "runtime/threads.hpp"
70 #include "runtime/threadSMR.hpp"
71 #include "runtime/vframe.inline.hpp"
72 #include "runtime/vm_version.hpp"
73 #include "utilities/macros.hpp"
74
75 #ifdef JVMTI_TRACE
76 #define EVT_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_SENT) != 0) { SafeResourceMark rm; log_trace(jvmti) out; }
77 #define EVT_TRIG_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_TRIGGER) != 0) { SafeResourceMark rm; log_trace(jvmti) out; }
78 #else
79 #define EVT_TRIG_TRACE(evt,out)
80 #define EVT_TRACE(evt,out)
81 #endif
82
83 ///////////////////////////////////////////////////////////////
84 //
85 // JvmtiEventTransition
86 //
87 // TO DO --
88 // more handle purging
89
90 // Use this for JavaThreads and state is _thread_in_vm.
91 class JvmtiJavaThreadEventTransition : StackObj {
92 private:
93 ResourceMark _rm;
94 ThreadToNativeFromVM _transition;
95 HandleMark _hm;
96
97 public:
98 JvmtiJavaThreadEventTransition(JavaThread *thread) :
99 _rm(),
100 _transition(thread),
101 _hm(thread) {};
102 };
103
104 // For JavaThreads which are not in _thread_in_vm state
105 // and other system threads use this.
106 class JvmtiThreadEventTransition : StackObj {
107 private:
108 ResourceMark _rm;
109 HandleMark _hm;
110 JavaThreadState _saved_state;
111 JavaThread *_jthread;
112
113 public:
114 JvmtiThreadEventTransition(Thread *thread) : _rm(), _hm(thread) {
115 if (thread->is_Java_thread()) {
116 _jthread = JavaThread::cast(thread);
117 _saved_state = _jthread->thread_state();
118 if (_saved_state == _thread_in_Java) {
119 ThreadStateTransition::transition_from_java(_jthread, _thread_in_native);
120 } else {
121 ThreadStateTransition::transition_from_vm(_jthread, _thread_in_native);
122 }
123 } else {
124 _jthread = NULL;
125 }
126 }
127
128 ~JvmtiThreadEventTransition() {
129 if (_jthread != NULL)
130 ThreadStateTransition::transition_from_native(_jthread, _saved_state);
131 }
132 };
133
134
135 ///////////////////////////////////////////////////////////////
136 //
137 // JvmtiEventMark
138 //
139
140 class JvmtiEventMark : public StackObj {
141 private:
142 JavaThread *_thread;
143 JNIEnv* _jni_env;
144 JvmtiThreadState::ExceptionState _saved_exception_state;
145
146 public:
147 JvmtiEventMark(JavaThread *thread) : _thread(thread),
148 _jni_env(thread->jni_environment()),
149 _saved_exception_state(JvmtiThreadState::ES_CLEARED) {
150 JvmtiThreadState *state = thread->jvmti_thread_state();
151 // we are before an event.
152 // Save current jvmti thread exception state.
153 if (state != NULL) {
154 _saved_exception_state = state->get_exception_state();
155 }
156
157 thread->push_jni_handle_block();
158 assert(thread == JavaThread::current(), "thread must be current!");
159 thread->frame_anchor()->make_walkable();
160 };
161
162 ~JvmtiEventMark() {
163 _thread->pop_jni_handle_block();
164
165 JvmtiThreadState* state = _thread->jvmti_thread_state();
166 // we are continuing after an event.
167 if (state != NULL) {
168 // Restore the jvmti thread exception state.
169 state->restore_exception_state(_saved_exception_state);
170 }
171 }
172
173 jobject to_jobject(oop obj) { return JNIHandles::make_local(_thread,obj); }
174
175 jclass to_jclass(Klass* klass) { return (klass == NULL ? NULL : (jclass)to_jobject(klass->java_mirror())); }
176
177 jmethodID to_jmethodID(const methodHandle& method) { return method->jmethod_id(); }
178
179 JNIEnv* jni_env() { return _jni_env; }
180 };
181
182 class JvmtiThreadEventMark : public JvmtiEventMark {
183 private:
184 jobject _jthread;
185
186 public:
187 JvmtiThreadEventMark(JavaThread *thread) :
188 JvmtiEventMark(thread) {
189 _jthread = to_jobject(thread->threadObj());
190 };
191 jthread jni_thread() { return (jthread)_jthread; }
192 };
193
194 class JvmtiVirtualThreadEventMark : public JvmtiEventMark {
195 private:
196 jobject _jthread;
197
198 public:
199 JvmtiVirtualThreadEventMark(JavaThread *thread) :
200 JvmtiEventMark(thread) {
201 JvmtiThreadState* state = thread->jvmti_thread_state();
202 if (state != NULL && state->is_virtual()) {
203 _jthread = to_jobject(thread->vthread());
204 } else {
205 _jthread = to_jobject(thread->threadObj());
206 }
207 };
208 jthread jni_thread() { return (jthread)_jthread; }
209 };
210
211 class JvmtiClassEventMark : public JvmtiVirtualThreadEventMark {
212 private:
213 jclass _jc;
214
215 public:
216 JvmtiClassEventMark(JavaThread *thread, Klass* klass) :
217 JvmtiVirtualThreadEventMark(thread) {
218 _jc = to_jclass(klass);
219 };
220 jclass jni_class() { return _jc; }
221 };
222
223 class JvmtiMethodEventMark : public JvmtiVirtualThreadEventMark {
224 private:
225 jmethodID _mid;
226
227 public:
228 JvmtiMethodEventMark(JavaThread *thread, const methodHandle& method) :
229 JvmtiVirtualThreadEventMark(thread),
230 _mid(to_jmethodID(method)) {};
231 jmethodID jni_methodID() { return _mid; }
232 };
233
234 class JvmtiLocationEventMark : public JvmtiMethodEventMark {
235 private:
236 jlocation _loc;
237
238 public:
239 JvmtiLocationEventMark(JavaThread *thread, const methodHandle& method, address location) :
240 JvmtiMethodEventMark(thread, method),
241 _loc(location - method->code_base()) {};
242 jlocation location() { return _loc; }
243 };
244
245 class JvmtiExceptionEventMark : public JvmtiLocationEventMark {
246 private:
247 jobject _exc;
248
249 public:
250 JvmtiExceptionEventMark(JavaThread *thread, const methodHandle& method, address location, Handle exception) :
251 JvmtiLocationEventMark(thread, method, location),
252 _exc(to_jobject(exception())) {};
253 jobject exception() { return _exc; }
254 };
255
256 class JvmtiClassFileLoadEventMark : public JvmtiThreadEventMark {
257 private:
258 const char *_class_name;
259 jobject _jloader;
260 jobject _protection_domain;
261 jclass _class_being_redefined;
262
263 public:
264 JvmtiClassFileLoadEventMark(JavaThread *thread, Symbol* name,
265 Handle class_loader, Handle prot_domain, Klass* class_being_redefined) : JvmtiThreadEventMark(thread) {
266 _class_name = name != NULL? name->as_utf8() : NULL;
267 _jloader = (jobject)to_jobject(class_loader());
268 _protection_domain = (jobject)to_jobject(prot_domain());
269 if (class_being_redefined == NULL) {
270 _class_being_redefined = NULL;
271 } else {
272 _class_being_redefined = (jclass)to_jclass(class_being_redefined);
273 }
274 };
275 const char *class_name() {
276 return _class_name;
277 }
278 jobject jloader() {
279 return _jloader;
280 }
281 jobject protection_domain() {
282 return _protection_domain;
283 }
284 jclass class_being_redefined() {
285 return _class_being_redefined;
286 }
287 };
288
289 //////////////////////////////////////////////////////////////////////////////
290
291 int JvmtiExport::_field_access_count = 0;
292 int JvmtiExport::_field_modification_count = 0;
293
294 bool JvmtiExport::_can_access_local_variables = false;
295 bool JvmtiExport::_can_hotswap_or_post_breakpoint = false;
296 bool JvmtiExport::_can_modify_any_class = false;
297 bool JvmtiExport::_can_walk_any_space = false;
298
299 uint64_t JvmtiExport::_redefinition_count = 0;
300 bool JvmtiExport::_all_dependencies_are_recorded = false;
301
302 //
303 // field access management
304 //
305
306 // interpreter generator needs the address of the counter
307 address JvmtiExport::get_field_access_count_addr() {
308 // We don't grab a lock because we don't want to
309 // serialize field access between all threads. This means that a
310 // thread on another processor can see the wrong count value and
311 // may either miss making a needed call into post_field_access()
312 // or will make an unneeded call into post_field_access(). We pay
313 // this price to avoid slowing down the VM when we aren't watching
314 // field accesses.
315 // Other access/mutation safe by virtue of being in VM state.
316 return (address)(&_field_access_count);
317 }
318
319 //
320 // field modification management
321 //
322
323 // interpreter generator needs the address of the counter
324 address JvmtiExport::get_field_modification_count_addr() {
325 // We don't grab a lock because we don't
326 // want to serialize field modification between all threads. This
327 // means that a thread on another processor can see the wrong
328 // count value and may either miss making a needed call into
329 // post_field_modification() or will make an unneeded call into
330 // post_field_modification(). We pay this price to avoid slowing
331 // down the VM when we aren't watching field modifications.
332 // Other access/mutation safe by virtue of being in VM state.
333 return (address)(&_field_modification_count);
334 }
335
336
337 ///////////////////////////////////////////////////////////////
338 // Functions needed by java.lang.instrument for starting up javaagent.
339 ///////////////////////////////////////////////////////////////
340
341 jint
342 JvmtiExport::get_jvmti_interface(JavaVM *jvm, void **penv, jint version) {
343 // The JVMTI_VERSION_INTERFACE_JVMTI part of the version number
344 // has already been validated in JNI GetEnv().
345 int major, minor, micro;
346
347 // micro version doesn't matter here (yet?)
348 decode_version_values(version, &major, &minor, µ);
349 switch (major) {
350 case 1:
351 switch (minor) {
352 case 0: // version 1.0.<micro> is recognized
353 case 1: // version 1.1.<micro> is recognized
354 case 2: // version 1.2.<micro> is recognized
355 break;
356
357 default:
358 return JNI_EVERSION; // unsupported minor version number
359 }
360 break;
361 case 9:
362 switch (minor) {
363 case 0: // version 9.0.<micro> is recognized
364 break;
365 default:
366 return JNI_EVERSION; // unsupported minor version number
367 }
368 break;
369 case 11:
370 switch (minor) {
371 case 0: // version 11.0.<micro> is recognized
372 break;
373 default:
374 return JNI_EVERSION; // unsupported minor version number
375 }
376 break;
377 default:
378 // Starting from 13 we do not care about minor version anymore
379 if (major < 13 || major > VM_Version::vm_major_version()) {
380 return JNI_EVERSION; // unsupported major version number
381 }
382 }
383 if (Continuations::enabled()) {
384 // Virtual threads support. There is a performance impact when VTMS transitions are enabled.
385 java_lang_VirtualThread::set_notify_jvmti_events(true);
386 }
387
388 if (JvmtiEnv::get_phase() == JVMTI_PHASE_LIVE) {
389 JavaThread* current_thread = JavaThread::current();
390 // transition code: native to VM
391 ThreadInVMfromNative __tiv(current_thread);
392 VM_ENTRY_BASE(jvmtiEnv*, JvmtiExport::get_jvmti_interface, current_thread)
393 debug_only(VMNativeEntryWrapper __vew;)
394
395 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version);
396 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv*
397 return JNI_OK;
398
399 } else if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
400 // not live, no thread to transition
401 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version);
402 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv*
403 return JNI_OK;
404
405 } else {
406 // Called at the wrong time
407 *penv = NULL;
408 return JNI_EDETACHED;
409 }
410 }
411
412 void
413 JvmtiExport::add_default_read_edges(Handle h_module, TRAPS) {
414 if (!Universe::is_module_initialized()) {
415 return; // extra safety
416 }
417 assert(!h_module.is_null(), "module should always be set");
418
419 // Invoke the transformedByAgent method
420 JavaValue result(T_VOID);
421 JavaCalls::call_static(&result,
422 vmClasses::module_Modules_klass(),
423 vmSymbols::transformedByAgent_name(),
424 vmSymbols::transformedByAgent_signature(),
425 h_module,
426 THREAD);
427
428 if (HAS_PENDING_EXCEPTION) {
429 LogTarget(Trace, jvmti) log;
430 LogStream log_stream(log);
431 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
432 log_stream.cr();
433 CLEAR_PENDING_EXCEPTION;
434 return;
435 }
436 }
437
438 jvmtiError
439 JvmtiExport::add_module_reads(Handle module, Handle to_module, TRAPS) {
440 if (!Universe::is_module_initialized()) {
441 return JVMTI_ERROR_NONE; // extra safety
442 }
443 assert(!module.is_null(), "module should always be set");
444 assert(!to_module.is_null(), "to_module should always be set");
445
446 // Invoke the addReads method
447 JavaValue result(T_VOID);
448 JavaCalls::call_static(&result,
449 vmClasses::module_Modules_klass(),
450 vmSymbols::addReads_name(),
451 vmSymbols::addReads_signature(),
452 module,
453 to_module,
454 THREAD);
455
456 if (HAS_PENDING_EXCEPTION) {
457 LogTarget(Trace, jvmti) log;
458 LogStream log_stream(log);
459 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
460 log_stream.cr();
461 CLEAR_PENDING_EXCEPTION;
462 return JVMTI_ERROR_INTERNAL;
463 }
464 return JVMTI_ERROR_NONE;
465 }
466
467 jvmtiError
468 JvmtiExport::add_module_exports(Handle module, Handle pkg_name, Handle to_module, TRAPS) {
469 if (!Universe::is_module_initialized()) {
470 return JVMTI_ERROR_NONE; // extra safety
471 }
472 assert(!module.is_null(), "module should always be set");
473 assert(!to_module.is_null(), "to_module should always be set");
474 assert(!pkg_name.is_null(), "pkg_name should always be set");
475
476 // Invoke the addExports method
477 JavaValue result(T_VOID);
478 JavaCalls::call_static(&result,
479 vmClasses::module_Modules_klass(),
480 vmSymbols::addExports_name(),
481 vmSymbols::addExports_signature(),
482 module,
483 pkg_name,
484 to_module,
485 THREAD);
486
487 if (HAS_PENDING_EXCEPTION) {
488 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
489 LogTarget(Trace, jvmti) log;
490 LogStream log_stream(log);
491 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
492 log_stream.cr();
493 CLEAR_PENDING_EXCEPTION;
494 if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) {
495 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
496 }
497 return JVMTI_ERROR_INTERNAL;
498 }
499 return JVMTI_ERROR_NONE;
500 }
501
502 jvmtiError
503 JvmtiExport::add_module_opens(Handle module, Handle pkg_name, Handle to_module, TRAPS) {
504 if (!Universe::is_module_initialized()) {
505 return JVMTI_ERROR_NONE; // extra safety
506 }
507 assert(!module.is_null(), "module should always be set");
508 assert(!to_module.is_null(), "to_module should always be set");
509 assert(!pkg_name.is_null(), "pkg_name should always be set");
510
511 // Invoke the addOpens method
512 JavaValue result(T_VOID);
513 JavaCalls::call_static(&result,
514 vmClasses::module_Modules_klass(),
515 vmSymbols::addOpens_name(),
516 vmSymbols::addExports_signature(),
517 module,
518 pkg_name,
519 to_module,
520 THREAD);
521
522 if (HAS_PENDING_EXCEPTION) {
523 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
524 LogTarget(Trace, jvmti) log;
525 LogStream log_stream(log);
526 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
527 log_stream.cr();
528 CLEAR_PENDING_EXCEPTION;
529 if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) {
530 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
531 }
532 return JVMTI_ERROR_INTERNAL;
533 }
534 return JVMTI_ERROR_NONE;
535 }
536
537 jvmtiError
538 JvmtiExport::add_module_uses(Handle module, Handle service, TRAPS) {
539 if (!Universe::is_module_initialized()) {
540 return JVMTI_ERROR_NONE; // extra safety
541 }
542 assert(!module.is_null(), "module should always be set");
543 assert(!service.is_null(), "service should always be set");
544
545 // Invoke the addUses method
546 JavaValue result(T_VOID);
547 JavaCalls::call_static(&result,
548 vmClasses::module_Modules_klass(),
549 vmSymbols::addUses_name(),
550 vmSymbols::addUses_signature(),
551 module,
552 service,
553 THREAD);
554
555 if (HAS_PENDING_EXCEPTION) {
556 LogTarget(Trace, jvmti) log;
557 LogStream log_stream(log);
558 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
559 log_stream.cr();
560 CLEAR_PENDING_EXCEPTION;
561 return JVMTI_ERROR_INTERNAL;
562 }
563 return JVMTI_ERROR_NONE;
564 }
565
566 jvmtiError
567 JvmtiExport::add_module_provides(Handle module, Handle service, Handle impl_class, TRAPS) {
568 if (!Universe::is_module_initialized()) {
569 return JVMTI_ERROR_NONE; // extra safety
570 }
571 assert(!module.is_null(), "module should always be set");
572 assert(!service.is_null(), "service should always be set");
573 assert(!impl_class.is_null(), "impl_class should always be set");
574
575 // Invoke the addProvides method
576 JavaValue result(T_VOID);
577 JavaCalls::call_static(&result,
578 vmClasses::module_Modules_klass(),
579 vmSymbols::addProvides_name(),
580 vmSymbols::addProvides_signature(),
581 module,
582 service,
583 impl_class,
584 THREAD);
585
586 if (HAS_PENDING_EXCEPTION) {
587 LogTarget(Trace, jvmti) log;
588 LogStream log_stream(log);
589 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
590 log_stream.cr();
591 CLEAR_PENDING_EXCEPTION;
592 return JVMTI_ERROR_INTERNAL;
593 }
594 return JVMTI_ERROR_NONE;
595 }
596
597 void
598 JvmtiExport::decode_version_values(jint version, int * major, int * minor,
599 int * micro) {
600 *major = (version & JVMTI_VERSION_MASK_MAJOR) >> JVMTI_VERSION_SHIFT_MAJOR;
601 *minor = (version & JVMTI_VERSION_MASK_MINOR) >> JVMTI_VERSION_SHIFT_MINOR;
602 *micro = (version & JVMTI_VERSION_MASK_MICRO) >> JVMTI_VERSION_SHIFT_MICRO;
603 }
604
605 void JvmtiExport::enter_primordial_phase() {
606 JvmtiEnvBase::set_phase(JVMTI_PHASE_PRIMORDIAL);
607 }
608
609 void JvmtiExport::enter_early_start_phase() {
610 set_early_vmstart_recorded(true);
611 }
612
613 void JvmtiExport::enter_start_phase() {
614 JvmtiEnvBase::set_phase(JVMTI_PHASE_START);
615 }
616
617 void JvmtiExport::enter_onload_phase() {
618 JvmtiEnvBase::set_phase(JVMTI_PHASE_ONLOAD);
619 }
620
621 void JvmtiExport::enter_live_phase() {
622 JvmtiEnvBase::set_phase(JVMTI_PHASE_LIVE);
623 }
624
625 //
626 // JVMTI events that the VM posts to the debugger and also startup agent
627 // and call the agent's premain() for java.lang.instrument.
628 //
629
630 void JvmtiExport::post_early_vm_start() {
631 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg Early VM start event triggered" ));
632
633 // can now enable some events
634 JvmtiEventController::vm_start();
635
636 JvmtiEnvIterator it;
637 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
638 // Only early vmstart envs post early VMStart event
639 if (env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) {
640 EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt Early VM start event sent" ));
641 JavaThread *thread = JavaThread::current();
642 JvmtiThreadEventMark jem(thread);
643 JvmtiJavaThreadEventTransition jet(thread);
644 jvmtiEventVMStart callback = env->callbacks()->VMStart;
645 if (callback != NULL) {
646 (*callback)(env->jvmti_external(), jem.jni_env());
647 }
648 }
649 }
650 }
651
652 void JvmtiExport::post_vm_start() {
653 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg VM start event triggered" ));
654
655 // can now enable some events
656 JvmtiEventController::vm_start();
657
658 JvmtiEnvIterator it;
659 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
660 // Early vmstart envs do not post normal VMStart event
661 if (!env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) {
662 EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt VM start event sent" ));
663
664 JavaThread *thread = JavaThread::current();
665 JvmtiThreadEventMark jem(thread);
666 JvmtiJavaThreadEventTransition jet(thread);
667 jvmtiEventVMStart callback = env->callbacks()->VMStart;
668 if (callback != NULL) {
669 (*callback)(env->jvmti_external(), jem.jni_env());
670 }
671 }
672 }
673 }
674
675 static OopStorage* _jvmti_oop_storage = NULL;
676 static OopStorage* _weak_tag_storage = NULL;
677
678 OopStorage* JvmtiExport::jvmti_oop_storage() {
679 assert(_jvmti_oop_storage != NULL, "not yet initialized");
680 return _jvmti_oop_storage;
681 }
682
683 OopStorage* JvmtiExport::weak_tag_storage() {
684 assert(_weak_tag_storage != NULL, "not yet initialized");
685 return _weak_tag_storage;
686 }
687
688 void JvmtiExport::initialize_oop_storage() {
689 // OopStorage needs to be created early in startup and unconditionally
690 // because of OopStorageSet static array indices.
691 _jvmti_oop_storage = OopStorageSet::create_strong("JVMTI OopStorage", mtServiceability);
692 _weak_tag_storage = OopStorageSet::create_weak("JVMTI Tag Weak OopStorage", mtServiceability);
693 _weak_tag_storage->register_num_dead_callback(&JvmtiTagMap::gc_notification);
694 }
695
696 void JvmtiExport::post_vm_initialized() {
697 EVT_TRIG_TRACE(JVMTI_EVENT_VM_INIT, ("Trg VM init event triggered" ));
698
699 // can now enable events
700 JvmtiEventController::vm_init();
701
702 JvmtiEnvIterator it;
703 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
704 if (env->is_enabled(JVMTI_EVENT_VM_INIT)) {
705 EVT_TRACE(JVMTI_EVENT_VM_INIT, ("Evt VM init event sent" ));
706
707 JavaThread *thread = JavaThread::current();
708 JvmtiThreadEventMark jem(thread);
709 JvmtiJavaThreadEventTransition jet(thread);
710 jvmtiEventVMInit callback = env->callbacks()->VMInit;
711 if (callback != NULL) {
712 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
713 }
714 }
715 }
716 }
717
718
719 void JvmtiExport::post_vm_death() {
720 EVT_TRIG_TRACE(JVMTI_EVENT_VM_DEATH, ("Trg VM death event triggered" ));
721
722 JvmtiEnvIterator it;
723 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
724 if (env->is_enabled(JVMTI_EVENT_VM_DEATH)) {
725 EVT_TRACE(JVMTI_EVENT_VM_DEATH, ("Evt VM death event sent" ));
726
727 JavaThread *thread = JavaThread::current();
728 JvmtiEventMark jem(thread);
729 JvmtiJavaThreadEventTransition jet(thread);
730 jvmtiEventVMDeath callback = env->callbacks()->VMDeath;
731 if (callback != NULL) {
732 (*callback)(env->jvmti_external(), jem.jni_env());
733 }
734 }
735 }
736
737 JvmtiEnvBase::set_phase(JVMTI_PHASE_DEAD);
738 JvmtiEventController::vm_death();
739 }
740
741 char**
742 JvmtiExport::get_all_native_method_prefixes(int* count_ptr) {
743 // Have to grab JVMTI thread state lock to be sure environment doesn't
744 // go away while we iterate them. No locks during VM bring-up.
745 if (Threads::number_of_threads() == 0 || SafepointSynchronize::is_at_safepoint()) {
746 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
747 } else {
748 MutexLocker mu(JvmtiThreadState_lock);
749 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
750 }
751 }
752
753 // Convert an external thread reference to a JavaThread found on the
754 // specified ThreadsList. The ThreadsListHandle in the caller "protects"
755 // the returned JavaThread *.
756 //
757 // If thread_oop_p is not NULL, then the caller wants to use the oop
758 // after this call so the oop is returned. On success, *jt_pp is set
759 // to the converted JavaThread * and JVMTI_ERROR_NONE is returned.
760 // On error, returns various JVMTI_ERROR_* values.
761 //
762 jvmtiError
763 JvmtiExport::cv_external_thread_to_JavaThread(ThreadsList * t_list,
764 jthread thread,
765 JavaThread ** jt_pp,
766 oop * thread_oop_p) {
767 assert(t_list != NULL, "must have a ThreadsList");
768 assert(jt_pp != NULL, "must have a return JavaThread pointer");
769 // thread_oop_p is optional so no assert()
770
771 if (thread_oop_p != NULL) {
772 *thread_oop_p = NULL;
773 }
774
775 oop thread_oop = JNIHandles::resolve_external_guard(thread);
776 if (thread_oop == NULL) {
777 // NULL jthread, GC'ed jthread or a bad JNI handle.
778 return JVMTI_ERROR_INVALID_THREAD;
779 }
780 // Looks like an oop at this point.
781
782 if (!thread_oop->is_a(vmClasses::Thread_klass())) {
783 // The oop is not a java.lang.Thread.
784 return JVMTI_ERROR_INVALID_THREAD;
785 }
786 // Looks like a java.lang.Thread oop at this point.
787
788 if (thread_oop_p != NULL) {
789 // Return the oop to the caller; the caller may still want
790 // the oop even if this function returns an error.
791 *thread_oop_p = thread_oop;
792 }
793
794 JavaThread * java_thread = java_lang_Thread::thread(thread_oop);
795 if (java_thread == NULL) {
796 if (java_lang_VirtualThread::is_instance(thread_oop)) {
797 return JVMTI_ERROR_INVALID_THREAD;
798 }
799 // The java.lang.Thread does not contain a JavaThread * so it has
800 // not yet run or it has died.
801 return JVMTI_ERROR_THREAD_NOT_ALIVE;
802 }
803 // Looks like a live JavaThread at this point.
804
805 // We do not check the EnableThreadSMRExtraValidityChecks option
806 // for this includes() call because JVM/TI's spec is tighter.
807 if (!t_list->includes(java_thread)) {
808 // Not on the JavaThreads list so it is not alive.
809 return JVMTI_ERROR_THREAD_NOT_ALIVE;
810 }
811
812 // Return a live JavaThread that is "protected" by the
813 // ThreadsListHandle in the caller.
814 *jt_pp = java_thread;
815
816 return JVMTI_ERROR_NONE;
817 }
818
819 // Convert an oop to a JavaThread found on the specified ThreadsList.
820 // The ThreadsListHandle in the caller "protects" the returned
821 // JavaThread *.
822 //
823 // On success, *jt_pp is set to the converted JavaThread * and
824 // JVMTI_ERROR_NONE is returned. On error, returns various
825 // JVMTI_ERROR_* values.
826 //
827 jvmtiError
828 JvmtiExport::cv_oop_to_JavaThread(ThreadsList * t_list, oop thread_oop,
829 JavaThread ** jt_pp) {
830 assert(t_list != NULL, "must have a ThreadsList");
831 assert(thread_oop != NULL, "must have an oop");
832 assert(jt_pp != NULL, "must have a return JavaThread pointer");
833
834 if (!thread_oop->is_a(vmClasses::Thread_klass())) {
835 // The oop is not a java.lang.Thread.
836 return JVMTI_ERROR_INVALID_THREAD;
837 }
838 // Looks like a java.lang.Thread oop at this point.
839
840 JavaThread * java_thread = java_lang_Thread::thread(thread_oop);
841 if (java_thread == NULL) {
842 // The java.lang.Thread does not contain a JavaThread * so it has
843 // not yet run or it has died.
844 return JVMTI_ERROR_THREAD_NOT_ALIVE;
845 }
846 // Looks like a live JavaThread at this point.
847
848 // We do not check the EnableThreadSMRExtraValidityChecks option
849 // for this includes() call because JVM/TI's spec is tighter.
850 if (!t_list->includes(java_thread)) {
851 // Not on the JavaThreads list so it is not alive.
852 return JVMTI_ERROR_THREAD_NOT_ALIVE;
853 }
854
855 // Return a live JavaThread that is "protected" by the
856 // ThreadsListHandle in the caller.
857 *jt_pp = java_thread;
858
859 return JVMTI_ERROR_NONE;
860 }
861
862 class JvmtiClassFileLoadHookPoster : public StackObj {
863 private:
864 Symbol* _h_name;
865 Handle _class_loader;
866 Handle _h_protection_domain;
867 unsigned char ** _data_ptr;
868 unsigned char ** _end_ptr;
869 JavaThread * _thread;
870 jint _curr_len;
871 unsigned char * _curr_data;
872 JvmtiEnv * _curr_env;
873 JvmtiCachedClassFileData ** _cached_class_file_ptr;
874 JvmtiThreadState * _state;
875 Klass* _class_being_redefined;
876 JvmtiClassLoadKind _load_kind;
877 bool _has_been_modified;
878
879 public:
880 inline JvmtiClassFileLoadHookPoster(Symbol* h_name, Handle class_loader,
881 Handle h_protection_domain,
882 unsigned char **data_ptr, unsigned char **end_ptr,
883 JvmtiCachedClassFileData **cache_ptr) {
884 _h_name = h_name;
885 _class_loader = class_loader;
886 _h_protection_domain = h_protection_domain;
887 _data_ptr = data_ptr;
888 _end_ptr = end_ptr;
889 _thread = JavaThread::current();
890 _curr_len = *end_ptr - *data_ptr;
891 _curr_data = *data_ptr;
892 _curr_env = NULL;
893 _cached_class_file_ptr = cache_ptr;
894 _has_been_modified = false;
895
896 assert(!_thread->is_in_any_VTMS_transition(), "CFLH events are not allowed in any VTMS transition");
897 _state = _thread->jvmti_thread_state();
898 if (_state != NULL) {
899 _class_being_redefined = _state->get_class_being_redefined();
900 _load_kind = _state->get_class_load_kind();
901 Klass* klass = (_class_being_redefined == NULL) ? NULL : _class_being_redefined;
902 if (_load_kind != jvmti_class_load_kind_load && klass != NULL) {
903 ModuleEntry* module_entry = InstanceKlass::cast(klass)->module();
904 assert(module_entry != NULL, "module_entry should always be set");
905 if (module_entry->is_named() &&
906 module_entry->module() != NULL &&
907 !module_entry->has_default_read_edges()) {
908 if (!module_entry->set_has_default_read_edges()) {
909 // We won a potential race.
910 // Add read edges to the unnamed modules of the bootstrap and app class loaders
911 Handle class_module(_thread, module_entry->module()); // Obtain j.l.r.Module
912 JvmtiExport::add_default_read_edges(class_module, _thread);
913 }
914 }
915 }
916 // Clear class_being_redefined flag here. The action
917 // from agent handler could generate a new class file load
918 // hook event and if it is not cleared the new event generated
919 // from regular class file load could have this stale redefined
920 // class handle info.
921 _state->clear_class_being_redefined();
922 } else {
923 // redefine and retransform will always set the thread state
924 _class_being_redefined = NULL;
925 _load_kind = jvmti_class_load_kind_load;
926 }
927 }
928
929 void post() {
930 post_all_envs();
931 copy_modified_data();
932 }
933
934 bool has_been_modified() { return _has_been_modified; }
935
936 private:
937 void post_all_envs() {
938 if (_load_kind != jvmti_class_load_kind_retransform) {
939 // for class load and redefine,
940 // call the non-retransformable agents
941 JvmtiEnvIterator it;
942 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
943 if (!env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
944 // non-retransformable agents cannot retransform back,
945 // so no need to cache the original class file bytes
946 post_to_env(env, false);
947 }
948 }
949 }
950 JvmtiEnvIterator it;
951 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
952 // retransformable agents get all events
953 if (env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
954 // retransformable agents need to cache the original class file
955 // bytes if changes are made via the ClassFileLoadHook
956 post_to_env(env, true);
957 }
958 }
959 }
960
961 void post_to_env(JvmtiEnv* env, bool caching_needed) {
962 if (env->phase() == JVMTI_PHASE_PRIMORDIAL && !env->early_class_hook_env()) {
963 return;
964 }
965 unsigned char *new_data = NULL;
966 jint new_len = 0;
967 JvmtiClassFileLoadEventMark jem(_thread, _h_name, _class_loader,
968 _h_protection_domain,
969 _class_being_redefined);
970 JvmtiJavaThreadEventTransition jet(_thread);
971 jvmtiEventClassFileLoadHook callback = env->callbacks()->ClassFileLoadHook;
972 if (callback != NULL) {
973 (*callback)(env->jvmti_external(), jem.jni_env(),
974 jem.class_being_redefined(),
975 jem.jloader(), jem.class_name(),
976 jem.protection_domain(),
977 _curr_len, _curr_data,
978 &new_len, &new_data);
979 }
980 if (new_data != NULL) {
981 // this agent has modified class data.
982 _has_been_modified = true;
983 if (caching_needed && *_cached_class_file_ptr == NULL) {
984 // data has been changed by the new retransformable agent
985 // and it hasn't already been cached, cache it
986 JvmtiCachedClassFileData *p;
987 p = (JvmtiCachedClassFileData *)os::malloc(
988 offset_of(JvmtiCachedClassFileData, data) + _curr_len, mtInternal);
989 if (p == NULL) {
990 vm_exit_out_of_memory(offset_of(JvmtiCachedClassFileData, data) + _curr_len,
991 OOM_MALLOC_ERROR,
992 "unable to allocate cached copy of original class bytes");
993 }
994 p->length = _curr_len;
995 memcpy(p->data, _curr_data, _curr_len);
996 *_cached_class_file_ptr = p;
997 }
998
999 if (_curr_data != *_data_ptr) {
1000 // curr_data is previous agent modified class data.
1001 // And this has been changed by the new agent so
1002 // we can delete it now.
1003 _curr_env->Deallocate(_curr_data);
1004 }
1005
1006 // Class file data has changed by the current agent.
1007 _curr_data = new_data;
1008 _curr_len = new_len;
1009 // Save the current agent env we need this to deallocate the
1010 // memory allocated by this agent.
1011 _curr_env = env;
1012 }
1013 }
1014
1015 void copy_modified_data() {
1016 // if one of the agent has modified class file data.
1017 // Copy modified class data to new resources array.
1018 if (_curr_data != *_data_ptr) {
1019 *_data_ptr = NEW_RESOURCE_ARRAY(u1, _curr_len);
1020 memcpy(*_data_ptr, _curr_data, _curr_len);
1021 *_end_ptr = *_data_ptr + _curr_len;
1022 _curr_env->Deallocate(_curr_data);
1023 }
1024 }
1025 };
1026
1027 bool JvmtiExport::is_early_phase() {
1028 return JvmtiEnvBase::get_phase() <= JVMTI_PHASE_PRIMORDIAL;
1029 }
1030
1031 bool JvmtiExport::has_early_class_hook_env() {
1032 JvmtiEnvIterator it;
1033 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1034 if (env->early_class_hook_env()) {
1035 return true;
1036 }
1037 }
1038 return false;
1039 }
1040
1041 bool JvmtiExport::_should_post_class_file_load_hook = false;
1042
1043 // this entry is for class file load hook on class load, redefine and retransform
1044 bool JvmtiExport::post_class_file_load_hook(Symbol* h_name,
1045 Handle class_loader,
1046 Handle h_protection_domain,
1047 unsigned char **data_ptr,
1048 unsigned char **end_ptr,
1049 JvmtiCachedClassFileData **cache_ptr) {
1050 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1051 return false;
1052 }
1053 if (JavaThread::current()->is_in_tmp_VTMS_transition()) {
1054 return false; // skip CFLH events in tmp VTMS transition
1055 }
1056
1057 JvmtiClassFileLoadHookPoster poster(h_name, class_loader,
1058 h_protection_domain,
1059 data_ptr, end_ptr,
1060 cache_ptr);
1061 poster.post();
1062 return poster.has_been_modified();
1063 }
1064
1065 void JvmtiExport::report_unsupported(bool on) {
1066 // If any JVMTI service is turned on, we need to exit before native code
1067 // tries to access nonexistent services.
1068 if (on) {
1069 vm_exit_during_initialization("Java Kernel does not support JVMTI.");
1070 }
1071 }
1072
1073
1074 static inline Klass* oop_to_klass(oop obj) {
1075 Klass* k = obj->klass();
1076
1077 // if the object is a java.lang.Class then return the java mirror
1078 if (k == vmClasses::Class_klass()) {
1079 if (!java_lang_Class::is_primitive(obj)) {
1080 k = java_lang_Class::as_Klass(obj);
1081 assert(k != NULL, "class for non-primitive mirror must exist");
1082 }
1083 }
1084 return k;
1085 }
1086
1087 class JvmtiObjectAllocEventMark : public JvmtiClassEventMark {
1088 private:
1089 jobject _jobj;
1090 jlong _size;
1091 public:
1092 JvmtiObjectAllocEventMark(JavaThread *thread, oop obj) : JvmtiClassEventMark(thread, oop_to_klass(obj)) {
1093 _jobj = (jobject)to_jobject(obj);
1094 _size = obj->size() * wordSize;
1095 };
1096 jobject jni_jobject() { return _jobj; }
1097 jlong size() { return _size; }
1098 };
1099
1100 class JvmtiCompiledMethodLoadEventMark : public JvmtiMethodEventMark {
1101 private:
1102 jint _code_size;
1103 const void *_code_data;
1104 jint _map_length;
1105 jvmtiAddrLocationMap *_map;
1106 const void *_compile_info;
1107 public:
1108 JvmtiCompiledMethodLoadEventMark(JavaThread *thread, nmethod *nm, void* compile_info_ptr = NULL)
1109 : JvmtiMethodEventMark(thread,methodHandle(thread, nm->method())) {
1110 _code_data = nm->code_begin();
1111 _code_size = nm->code_size();
1112 _compile_info = compile_info_ptr; // Set void pointer of compiledMethodLoad Event. Default value is NULL.
1113 JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nm, &_map, &_map_length);
1114 }
1115 ~JvmtiCompiledMethodLoadEventMark() {
1116 FREE_C_HEAP_ARRAY(jvmtiAddrLocationMap, _map);
1117 }
1118
1119 jint code_size() { return _code_size; }
1120 const void *code_data() { return _code_data; }
1121 jint map_length() { return _map_length; }
1122 const jvmtiAddrLocationMap* map() { return _map; }
1123 const void *compile_info() { return _compile_info; }
1124 };
1125
1126
1127
1128 class JvmtiMonitorEventMark : public JvmtiVirtualThreadEventMark {
1129 private:
1130 jobject _jobj;
1131 public:
1132 JvmtiMonitorEventMark(JavaThread *thread, oop object)
1133 : JvmtiVirtualThreadEventMark(thread){
1134 _jobj = to_jobject(object);
1135 }
1136 jobject jni_object() { return _jobj; }
1137 };
1138
1139 ///////////////////////////////////////////////////////////////
1140 //
1141 // pending CompiledMethodUnload support
1142 //
1143
1144 void JvmtiExport::post_compiled_method_unload(
1145 jmethodID method, const void *code_begin) {
1146 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1147 return;
1148 }
1149 JavaThread* thread = JavaThread::current();
1150 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
1151 ("[%s] method compile unload event triggered",
1152 JvmtiTrace::safe_get_thread_name(thread)));
1153
1154 // post the event for each environment that has this event enabled.
1155 JvmtiEnvIterator it;
1156 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1157 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_UNLOAD)) {
1158 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1159 continue;
1160 }
1161 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
1162 ("[%s] class compile method unload event sent jmethodID " PTR_FORMAT,
1163 JvmtiTrace::safe_get_thread_name(thread), p2i(method)));
1164
1165 ResourceMark rm(thread);
1166
1167 JvmtiEventMark jem(thread);
1168 JvmtiJavaThreadEventTransition jet(thread);
1169 jvmtiEventCompiledMethodUnload callback = env->callbacks()->CompiledMethodUnload;
1170 if (callback != NULL) {
1171 (*callback)(env->jvmti_external(), method, code_begin);
1172 }
1173 }
1174 }
1175 }
1176
1177 ///////////////////////////////////////////////////////////////
1178 //
1179 // JvmtiExport
1180 //
1181
1182 void JvmtiExport::post_raw_breakpoint(JavaThread *thread, Method* method, address location) {
1183 HandleMark hm(thread);
1184 methodHandle mh(thread, method);
1185
1186 JvmtiThreadState *state = thread->jvmti_thread_state();
1187 if (state == NULL) {
1188 return;
1189 }
1190 if (thread->is_in_any_VTMS_transition()) {
1191 return; // no events should be posted if thread is in any VTMS transition
1192 }
1193
1194 EVT_TRIG_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Trg Breakpoint triggered",
1195 JvmtiTrace::safe_get_thread_name(thread)));
1196 JvmtiEnvThreadStateIterator it(state);
1197 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1198 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_BREAKPOINT);
1199 if (!ets->breakpoint_posted() && ets->is_enabled(JVMTI_EVENT_BREAKPOINT)) {
1200 ThreadState old_os_state = thread->osthread()->get_state();
1201 thread->osthread()->set_state(BREAKPOINTED);
1202 EVT_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Evt Breakpoint sent %s.%s @ " INTX_FORMAT,
1203 JvmtiTrace::safe_get_thread_name(thread),
1204 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1205 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1206 location - mh()->code_base() ));
1207
1208 JvmtiEnv *env = ets->get_env();
1209 JvmtiLocationEventMark jem(thread, mh, location);
1210 JvmtiJavaThreadEventTransition jet(thread);
1211 jvmtiEventBreakpoint callback = env->callbacks()->Breakpoint;
1212 if (callback != NULL) {
1213 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1214 jem.jni_methodID(), jem.location());
1215 }
1216
1217 ets->set_breakpoint_posted();
1218 thread->osthread()->set_state(old_os_state);
1219 }
1220 }
1221 }
1222
1223 //////////////////////////////////////////////////////////////////////////////
1224
1225 bool JvmtiExport::_can_get_source_debug_extension = false;
1226 bool JvmtiExport::_can_maintain_original_method_order = false;
1227 bool JvmtiExport::_can_post_interpreter_events = false;
1228 bool JvmtiExport::_can_post_on_exceptions = false;
1229 bool JvmtiExport::_can_post_breakpoint = false;
1230 bool JvmtiExport::_can_post_field_access = false;
1231 bool JvmtiExport::_can_post_field_modification = false;
1232 bool JvmtiExport::_can_post_method_entry = false;
1233 bool JvmtiExport::_can_post_method_exit = false;
1234 bool JvmtiExport::_can_post_frame_pop = false;
1235 bool JvmtiExport::_can_pop_frame = false;
1236 bool JvmtiExport::_can_force_early_return = false;
1237 bool JvmtiExport::_can_support_virtual_threads = false;
1238 bool JvmtiExport::_can_get_owned_monitor_info = false;
1239
1240 bool JvmtiExport::_early_vmstart_recorded = false;
1241
1242 bool JvmtiExport::_should_post_single_step = false;
1243 bool JvmtiExport::_should_post_field_access = false;
1244 bool JvmtiExport::_should_post_field_modification = false;
1245 bool JvmtiExport::_should_post_class_load = false;
1246 bool JvmtiExport::_should_post_class_prepare = false;
1247 bool JvmtiExport::_should_post_class_unload = false;
1248 bool JvmtiExport::_should_post_thread_life = false;
1249 bool JvmtiExport::_should_clean_up_heap_objects = false;
1250 bool JvmtiExport::_should_post_native_method_bind = false;
1251 bool JvmtiExport::_should_post_dynamic_code_generated = false;
1252 bool JvmtiExport::_should_post_data_dump = false;
1253 bool JvmtiExport::_should_post_compiled_method_load = false;
1254 bool JvmtiExport::_should_post_compiled_method_unload = false;
1255 bool JvmtiExport::_should_post_monitor_contended_enter = false;
1256 bool JvmtiExport::_should_post_monitor_contended_entered = false;
1257 bool JvmtiExport::_should_post_monitor_wait = false;
1258 bool JvmtiExport::_should_post_monitor_waited = false;
1259 bool JvmtiExport::_should_post_garbage_collection_start = false;
1260 bool JvmtiExport::_should_post_garbage_collection_finish = false;
1261 bool JvmtiExport::_should_post_object_free = false;
1262 bool JvmtiExport::_should_post_resource_exhausted = false;
1263 bool JvmtiExport::_should_post_vm_object_alloc = false;
1264 bool JvmtiExport::_should_post_sampled_object_alloc = false;
1265 bool JvmtiExport::_should_post_on_exceptions = false;
1266 bool JvmtiExport::_should_post_vthread_start = false;
1267 bool JvmtiExport::_should_post_vthread_end = false;
1268 bool JvmtiExport::_should_post_vthread_mount = false;
1269 bool JvmtiExport::_should_post_vthread_unmount = false;
1270
1271 ////////////////////////////////////////////////////////////////////////////////////////////////
1272
1273
1274 void JvmtiExport::check_vthread_and_suspend_at_safepoint(JavaThread *thread) {
1275 oop vt = thread->jvmti_vthread();
1276
1277 if (vt != NULL && java_lang_VirtualThread::is_instance(vt)) {
1278 int64_t id = java_lang_Thread::thread_id(vt);
1279
1280 ThreadBlockInVM tbivm(thread);
1281 MonitorLocker ml(JvmtiVTMSTransition_lock, Mutex::_no_safepoint_check_flag);
1282
1283 // block while vthread is externally suspended
1284 while (JvmtiVTSuspender::is_vthread_suspended(id)) {
1285 ml.wait();
1286 }
1287 }
1288 }
1289
1290 //
1291 // JVMTI single step management
1292 //
1293 void JvmtiExport::at_single_stepping_point(JavaThread *thread, Method* method, address location) {
1294 assert(JvmtiExport::should_post_single_step(), "must be single stepping");
1295
1296 HandleMark hm(thread);
1297 methodHandle mh(thread, method);
1298
1299 // update information about current location and post a step event
1300 JvmtiThreadState *state = thread->jvmti_thread_state();
1301 if (state == NULL) {
1302 return;
1303 }
1304 EVT_TRIG_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Trg Single Step triggered",
1305 JvmtiTrace::safe_get_thread_name(thread)));
1306 if (!state->hide_single_stepping()) {
1307 if (state->is_pending_step_for_popframe()) {
1308 state->process_pending_step_for_popframe();
1309 }
1310 if (state->is_pending_step_for_earlyret()) {
1311 state->process_pending_step_for_earlyret();
1312 }
1313 JvmtiExport::post_single_step(thread, mh(), location);
1314 }
1315 }
1316
1317
1318 void JvmtiExport::expose_single_stepping(JavaThread *thread) {
1319 JvmtiThreadState *state = thread->jvmti_thread_state();
1320 if (state != NULL) {
1321 state->clear_hide_single_stepping();
1322 }
1323 }
1324
1325
1326 bool JvmtiExport::hide_single_stepping(JavaThread *thread) {
1327 JvmtiThreadState *state = thread->jvmti_thread_state();
1328 if (state != NULL && state->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1329 state->set_hide_single_stepping();
1330 return true;
1331 } else {
1332 return false;
1333 }
1334 }
1335
1336 void JvmtiExport::post_class_load(JavaThread *thread, Klass* klass) {
1337 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1338 return;
1339 }
1340 HandleMark hm(thread);
1341
1342 JvmtiThreadState* state = thread->jvmti_thread_state();
1343 if (state == NULL) {
1344 return;
1345 }
1346 if (thread->is_in_tmp_VTMS_transition()) {
1347 return; // skip ClassLoad events in tmp VTMS transition
1348 }
1349 assert(!thread->is_in_any_VTMS_transition(), "class load events are not allowed in any VTMS transition");
1350
1351 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Trg Class Load triggered",
1352 JvmtiTrace::safe_get_thread_name(thread)));
1353 JvmtiEnvThreadStateIterator it(state);
1354 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1355 if (ets->is_enabled(JVMTI_EVENT_CLASS_LOAD)) {
1356 JvmtiEnv *env = ets->get_env();
1357 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1358 continue;
1359 }
1360 EVT_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Evt Class Load sent %s",
1361 JvmtiTrace::safe_get_thread_name(thread),
1362 klass==NULL? "NULL" : klass->external_name() ));
1363 JvmtiClassEventMark jem(thread, klass);
1364 JvmtiJavaThreadEventTransition jet(thread);
1365 jvmtiEventClassLoad callback = env->callbacks()->ClassLoad;
1366 if (callback != NULL) {
1367 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1368 }
1369 }
1370 }
1371 }
1372
1373
1374 void JvmtiExport::post_class_prepare(JavaThread *thread, Klass* klass) {
1375 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1376 return;
1377 }
1378 HandleMark hm(thread);
1379
1380 JvmtiThreadState* state = thread->jvmti_thread_state();
1381 if (state == NULL) {
1382 return;
1383 }
1384 if (thread->is_in_tmp_VTMS_transition()) {
1385 return; // skip ClassPrepare events in tmp VTMS transition
1386 }
1387 assert(!thread->is_in_any_VTMS_transition(), "class prepare events are not allowed in any VTMS transition");
1388
1389 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Trg Class Prepare triggered",
1390 JvmtiTrace::safe_get_thread_name(thread)));
1391 JvmtiEnvThreadStateIterator it(state);
1392 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1393 if (ets->is_enabled(JVMTI_EVENT_CLASS_PREPARE)) {
1394 JvmtiEnv *env = ets->get_env();
1395 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1396 continue;
1397 }
1398 EVT_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Evt Class Prepare sent %s",
1399 JvmtiTrace::safe_get_thread_name(thread),
1400 klass==NULL? "NULL" : klass->external_name() ));
1401 JvmtiClassEventMark jem(thread, klass);
1402 JvmtiJavaThreadEventTransition jet(thread);
1403 jvmtiEventClassPrepare callback = env->callbacks()->ClassPrepare;
1404 if (callback != NULL) {
1405 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1406 }
1407 }
1408 }
1409 }
1410
1411 void JvmtiExport::post_class_unload(Klass* klass) {
1412 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1413 return;
1414 }
1415
1416 // postings to the service thread so that it can perform them in a safe
1417 // context and in-order.
1418 ResourceMark rm;
1419 // JvmtiDeferredEvent copies the string.
1420 JvmtiDeferredEvent event = JvmtiDeferredEvent::class_unload_event(klass->name()->as_C_string());
1421 ServiceThread::enqueue_deferred_event(&event);
1422 }
1423
1424
1425 void JvmtiExport::post_class_unload_internal(const char* name) {
1426 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1427 return;
1428 }
1429 assert(Thread::current()->is_service_thread(), "must be called from ServiceThread");
1430 JavaThread *thread = JavaThread::current();
1431 HandleMark hm(thread);
1432
1433 EVT_TRIG_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Trg Class Unload triggered" ));
1434 if (JvmtiEventController::is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1435
1436 JvmtiEnvIterator it;
1437 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1438 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1439 continue;
1440 }
1441 if (env->is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1442 EVT_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Evt Class Unload sent %s", name));
1443
1444 JvmtiEventMark jem(thread);
1445 JvmtiJavaThreadEventTransition jet(thread);
1446 jvmtiExtensionEvent callback = env->ext_callbacks()->ClassUnload;
1447 if (callback != NULL) {
1448 (*callback)(env->jvmti_external(), jem.jni_env(), name);
1449 }
1450 }
1451 }
1452 }
1453 }
1454
1455
1456 void JvmtiExport::post_thread_start(JavaThread *thread) {
1457 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1458 return;
1459 }
1460 assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
1461
1462 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Trg Thread Start event triggered",
1463 JvmtiTrace::safe_get_thread_name(thread)));
1464
1465 // do JVMTI thread initialization (if needed)
1466 JvmtiEventController::thread_started(thread);
1467
1468 // Do not post thread start event for hidden java thread.
1469 if (JvmtiEventController::is_enabled(JVMTI_EVENT_THREAD_START) &&
1470 !thread->is_hidden_from_external_view()) {
1471 JvmtiEnvIterator it;
1472 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1473 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1474 continue;
1475 }
1476 if (env->is_enabled(JVMTI_EVENT_THREAD_START)) {
1477 EVT_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Evt Thread Start event sent",
1478 JvmtiTrace::safe_get_thread_name(thread) ));
1479
1480 JvmtiVirtualThreadEventMark jem(thread);
1481 JvmtiJavaThreadEventTransition jet(thread);
1482 jvmtiEventThreadStart callback = env->callbacks()->ThreadStart;
1483 if (callback != NULL) {
1484 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1485 }
1486 }
1487 }
1488 }
1489 }
1490
1491
1492 void JvmtiExport::post_thread_end(JavaThread *thread) {
1493 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1494 return;
1495 }
1496 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Trg Thread End event triggered",
1497 JvmtiTrace::safe_get_thread_name(thread)));
1498
1499 JvmtiThreadState *state = thread->jvmti_thread_state();
1500 if (state == NULL) {
1501 return;
1502 }
1503
1504 // Do not post thread end event for hidden java thread.
1505 if (state->is_enabled(JVMTI_EVENT_THREAD_END) &&
1506 !thread->is_hidden_from_external_view()) {
1507
1508 JvmtiEnvThreadStateIterator it(state);
1509 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1510 if (ets->is_enabled(JVMTI_EVENT_THREAD_END)) {
1511 JvmtiEnv *env = ets->get_env();
1512 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1513 continue;
1514 }
1515 EVT_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Evt Thread End event sent",
1516 JvmtiTrace::safe_get_thread_name(thread) ));
1517
1518 JvmtiVirtualThreadEventMark jem(thread);
1519 JvmtiJavaThreadEventTransition jet(thread);
1520 jvmtiEventThreadEnd callback = env->callbacks()->ThreadEnd;
1521 if (callback != NULL) {
1522 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1523 }
1524 }
1525 }
1526 }
1527 }
1528
1529
1530 void JvmtiExport::post_vthread_start(jobject vthread) {
1531 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1532 return;
1533 }
1534 EVT_TRIG_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_START, ("[%p] Trg Virtual Thread Start event triggered", vthread));
1535
1536 JavaThread *cur_thread = JavaThread::current();
1537 JvmtiThreadState *state = cur_thread->jvmti_thread_state();
1538 if (state == NULL) {
1539 return;
1540 }
1541
1542 if (state->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_START)) {
1543 JvmtiEnvThreadStateIterator it(state);
1544
1545 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1546 JvmtiEnv *env = ets->get_env();
1547 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1548 continue;
1549 }
1550 if (ets->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_START)) {
1551 EVT_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_START, ("[%p] Evt Virtual Thread Start event sent", vthread));
1552
1553 JvmtiVirtualThreadEventMark jem(cur_thread);
1554 JvmtiJavaThreadEventTransition jet(cur_thread);
1555 jvmtiEventVirtualThreadStart callback = env->callbacks()->VirtualThreadStart;
1556 if (callback != NULL) {
1557 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1558 }
1559 }
1560 }
1561 }
1562 }
1563
1564 void JvmtiExport::post_vthread_end(jobject vthread) {
1565 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1566 return;
1567 }
1568 EVT_TRIG_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_END, ("[%p] Trg Virtual Thread End event triggered", vthread));
1569
1570 JavaThread *cur_thread = JavaThread::current();
1571 JvmtiThreadState *state = cur_thread->jvmti_thread_state();
1572 if (state == NULL) {
1573 return;
1574 }
1575
1576 if (state->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_END)) {
1577 JvmtiEnvThreadStateIterator it(state);
1578
1579 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1580 JvmtiEnv *env = ets->get_env();
1581 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1582 continue;
1583 }
1584 if (ets->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_END)) {
1585 EVT_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_END, ("[%p] Evt Virtual Thread End event sent", vthread));
1586
1587 JvmtiVirtualThreadEventMark jem(cur_thread);
1588 JvmtiJavaThreadEventTransition jet(cur_thread);
1589 jvmtiEventVirtualThreadEnd callback = env->callbacks()->VirtualThreadEnd;
1590 if (callback != NULL) {
1591 (*callback)(env->jvmti_external(), jem.jni_env(), vthread);
1592 }
1593 }
1594 }
1595 }
1596 }
1597
1598 void JvmtiExport::post_vthread_mount(jobject vthread) {
1599 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1600 return;
1601 }
1602 JavaThread *thread = JavaThread::current();
1603 HandleMark hm(thread);
1604 EVT_TRIG_TRACE(EXT_EVENT_VIRTUAL_THREAD_MOUNT, ("[%p] Trg Virtual Thread Mount event triggered", vthread));
1605
1606 JvmtiThreadState *state = thread->jvmti_thread_state();
1607 if (state == NULL) {
1608 return;
1609 }
1610
1611 if (state->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_MOUNT)) {
1612 JvmtiEnvThreadStateIterator it(state);
1613
1614 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1615 JvmtiEnv *env = ets->get_env();
1616 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1617 continue;
1618 }
1619 if (ets->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_MOUNT)) {
1620 EVT_TRACE(EXT_EVENT_VIRTUAL_THREAD_MOUNT, ("[%p] Evt Virtual Thread Mount event sent", vthread));
1621
1622 JvmtiVirtualThreadEventMark jem(thread);
1623 JvmtiJavaThreadEventTransition jet(thread);
1624 jvmtiExtensionEvent callback = env->ext_callbacks()->VirtualThreadMount;
1625 if (callback != NULL) {
1626 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1627 }
1628 }
1629 }
1630 }
1631 }
1632
1633 void JvmtiExport::post_vthread_unmount(jobject vthread) {
1634 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1635 return;
1636 }
1637 JavaThread *thread = JavaThread::current();
1638 HandleMark hm(thread);
1639 EVT_TRIG_TRACE(EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, ("[%p] Trg Virtual Thread Unmount event triggered", vthread));
1640
1641 JvmtiThreadState *state = thread->jvmti_thread_state();
1642 if (state == NULL) {
1643 return;
1644 }
1645
1646 if (state->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_UNMOUNT)) {
1647 JvmtiEnvThreadStateIterator it(state);
1648
1649 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1650 JvmtiEnv *env = ets->get_env();
1651 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1652 continue;
1653 }
1654 if (ets->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_UNMOUNT)) {
1655 EVT_TRACE(EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, ("[%p] Evt Virtual Thread Unmount event sent", vthread));
1656
1657 JvmtiVirtualThreadEventMark jem(thread);
1658 JvmtiJavaThreadEventTransition jet(thread);
1659 jvmtiExtensionEvent callback = env->ext_callbacks()->VirtualThreadUnmount;
1660 if (callback != NULL) {
1661 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1662 }
1663 }
1664 }
1665 }
1666 }
1667
1668 void JvmtiExport::continuation_yield_cleanup(JavaThread* thread, jint continuation_frame_count) {
1669 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1670 return;
1671 }
1672
1673 assert(thread == JavaThread::current(), "must be");
1674 JvmtiThreadState *state = thread->jvmti_thread_state();
1675 if (state == NULL) {
1676 return;
1677 }
1678 state->invalidate_cur_stack_depth();
1679
1680 // Clear frame_pop requests in frames popped by yield
1681 if (can_post_frame_pop()) {
1682 JvmtiEnvThreadStateIterator it(state);
1683 int top_frame_num = state->cur_stack_depth() + continuation_frame_count;
1684
1685 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1686 if (!ets->has_frame_pops()) {
1687 continue;
1688 }
1689 for (int frame_idx = 0; frame_idx < continuation_frame_count; frame_idx++) {
1690 int frame_num = top_frame_num - frame_idx;
1691
1692 if (!state->is_virtual() && ets->is_frame_pop(frame_num)) {
1693 // remove the frame's entry
1694 MutexLocker mu(JvmtiThreadState_lock);
1695 ets->clear_frame_pop(frame_num);
1696 }
1697 }
1698 }
1699 }
1700 }
1701
1702 void JvmtiExport::post_object_free(JvmtiEnv* env, GrowableArray<jlong>* objects) {
1703 assert(objects != NULL, "Nothing to post");
1704
1705 JavaThread *javaThread = JavaThread::current();
1706 if (javaThread->is_in_any_VTMS_transition()) {
1707 return; // no events should be posted if thread is in any VTMS transition
1708 }
1709 if (!env->is_enabled(JVMTI_EVENT_OBJECT_FREE)) {
1710 return; // the event type has been already disabled
1711 }
1712
1713 EVT_TRIG_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Trg Object Free triggered" ));
1714 EVT_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Evt Object Free sent"));
1715
1716 JvmtiThreadEventMark jem(javaThread);
1717 JvmtiJavaThreadEventTransition jet(javaThread);
1718 jvmtiEventObjectFree callback = env->callbacks()->ObjectFree;
1719 if (callback != NULL) {
1720 for (int index = 0; index < objects->length(); index++) {
1721 (*callback)(env->jvmti_external(), objects->at(index));
1722 }
1723 }
1724 }
1725
1726 void JvmtiExport::post_resource_exhausted(jint resource_exhausted_flags, const char* description) {
1727
1728 JavaThread *thread = JavaThread::current();
1729
1730 if (thread->is_in_any_VTMS_transition()) {
1731 return; // no events should be posted if thread is in any VTMS transition
1732 }
1733
1734 log_error(jvmti)("Posting Resource Exhausted event: %s",
1735 description != nullptr ? description : "unknown");
1736
1737 // JDK-8213834: handlers of ResourceExhausted may attempt some analysis
1738 // which often requires running java.
1739 // This will cause problems on threads not able to run java, e.g. compiler
1740 // threads. To forestall these problems, we therefore suppress sending this
1741 // event from threads which are not able to run java.
1742 if (!thread->can_call_java()) {
1743 return;
1744 }
1745
1746 EVT_TRIG_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Trg resource exhausted event triggered" ));
1747
1748 JvmtiEnvIterator it;
1749 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1750 if (env->is_enabled(JVMTI_EVENT_RESOURCE_EXHAUSTED)) {
1751 EVT_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Evt resource exhausted event sent" ));
1752
1753 JvmtiThreadEventMark jem(thread);
1754 JvmtiJavaThreadEventTransition jet(thread);
1755 jvmtiEventResourceExhausted callback = env->callbacks()->ResourceExhausted;
1756 if (callback != NULL) {
1757 (*callback)(env->jvmti_external(), jem.jni_env(),
1758 resource_exhausted_flags, NULL, description);
1759 }
1760 }
1761 }
1762 }
1763
1764 void JvmtiExport::post_method_entry(JavaThread *thread, Method* method, frame current_frame) {
1765 HandleMark hm(thread);
1766 methodHandle mh(thread, method);
1767
1768 JvmtiThreadState* state = thread->jvmti_thread_state();
1769 if (state == NULL || !state->is_interp_only_mode()) {
1770 // for any thread that actually wants method entry, interp_only_mode is set
1771 return;
1772 }
1773 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1774 return; // no events should be posted if thread is in any VTMS transition
1775 }
1776 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Trg Method Entry triggered %s.%s",
1777 JvmtiTrace::safe_get_thread_name(thread),
1778 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1779 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1780
1781 state->incr_cur_stack_depth();
1782
1783 if (state->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1784 JvmtiEnvThreadStateIterator it(state);
1785 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1786 if (ets->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1787 EVT_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Evt Method Entry sent %s.%s",
1788 JvmtiTrace::safe_get_thread_name(thread),
1789 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1790 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1791
1792 JvmtiEnv *env = ets->get_env();
1793 JvmtiMethodEventMark jem(thread, mh);
1794 JvmtiJavaThreadEventTransition jet(thread);
1795 jvmtiEventMethodEntry callback = env->callbacks()->MethodEntry;
1796 if (callback != NULL) {
1797 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_methodID());
1798 }
1799 }
1800 }
1801 }
1802 }
1803
1804 void JvmtiExport::post_method_exit(JavaThread* thread, Method* method, frame current_frame) {
1805 HandleMark hm(thread);
1806 methodHandle mh(thread, method);
1807
1808 JvmtiThreadState *state = thread->jvmti_thread_state();
1809
1810 if (state == NULL || !state->is_interp_only_mode()) {
1811 // for any thread that actually wants method exit, interp_only_mode is set
1812 return;
1813 }
1814
1815 // return a flag when a method terminates by throwing an exception
1816 // i.e. if an exception is thrown and it's not caught by the current method
1817 bool exception_exit = state->is_exception_detected() && !state->is_exception_caught();
1818 Handle result;
1819 jvalue value;
1820 value.j = 0L;
1821
1822 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1823 // if the method hasn't been popped because of an exception then we populate
1824 // the return_value parameter for the callback. At this point we only have
1825 // the address of a "raw result" and we just call into the interpreter to
1826 // convert this into a jvalue.
1827 if (!exception_exit) {
1828 oop oop_result;
1829 BasicType type = current_frame.interpreter_frame_result(&oop_result, &value);
1830 if (is_reference_type(type)) {
1831 result = Handle(thread, oop_result);
1832 value.l = JNIHandles::make_local(thread, result());
1833 }
1834 }
1835 }
1836
1837 // Deferred transition to VM, so we can stash away the return oop before GC
1838 // Note that this transition is not needed when throwing an exception, because
1839 // there is no oop to retain.
1840 JavaThread* current = thread; // for JRT_BLOCK
1841 JRT_BLOCK
1842 post_method_exit_inner(thread, mh, state, exception_exit, current_frame, value);
1843 JRT_BLOCK_END
1844
1845 if (result.not_null() && !mh->is_native()) {
1846 // We have to restore the oop on the stack for interpreter frames
1847 *(oop*)current_frame.interpreter_frame_tos_address() = result();
1848 }
1849 }
1850
1851 void JvmtiExport::post_method_exit_inner(JavaThread* thread,
1852 methodHandle& mh,
1853 JvmtiThreadState *state,
1854 bool exception_exit,
1855 frame current_frame,
1856 jvalue& value) {
1857 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1858 return; // no events should be posted if thread is in any VTMS transition
1859 }
1860
1861 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Trg Method Exit triggered %s.%s",
1862 JvmtiTrace::safe_get_thread_name(thread),
1863 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1864 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1865
1866 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1867 JvmtiEnvThreadStateIterator it(state);
1868 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1869 if (ets->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1870 EVT_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Evt Method Exit sent %s.%s",
1871 JvmtiTrace::safe_get_thread_name(thread),
1872 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1873 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1874
1875 JvmtiEnv *env = ets->get_env();
1876 JvmtiMethodEventMark jem(thread, mh);
1877 JvmtiJavaThreadEventTransition jet(thread);
1878 jvmtiEventMethodExit callback = env->callbacks()->MethodExit;
1879 if (callback != NULL) {
1880 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1881 jem.jni_methodID(), exception_exit, value);
1882 }
1883 }
1884 }
1885 }
1886
1887 JvmtiEnvThreadStateIterator it(state);
1888 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1889 if (ets->has_frame_pops()) {
1890 int cur_frame_number = state->cur_stack_depth();
1891
1892 if (ets->is_frame_pop(cur_frame_number)) {
1893 // we have a NotifyFramePop entry for this frame.
1894 // now check that this env/thread wants this event
1895 if (ets->is_enabled(JVMTI_EVENT_FRAME_POP)) {
1896 EVT_TRACE(JVMTI_EVENT_FRAME_POP, ("[%s] Evt Frame Pop sent %s.%s",
1897 JvmtiTrace::safe_get_thread_name(thread),
1898 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1899 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1900
1901 // we also need to issue a frame pop event for this frame
1902 JvmtiEnv *env = ets->get_env();
1903 JvmtiMethodEventMark jem(thread, mh);
1904 JvmtiJavaThreadEventTransition jet(thread);
1905 jvmtiEventFramePop callback = env->callbacks()->FramePop;
1906 if (callback != NULL) {
1907 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1908 jem.jni_methodID(), exception_exit);
1909 }
1910 }
1911 // remove the frame's entry
1912 {
1913 MutexLocker mu(JvmtiThreadState_lock);
1914 ets->clear_frame_pop(cur_frame_number);
1915 }
1916 }
1917 }
1918 }
1919
1920 state->decr_cur_stack_depth();
1921 }
1922
1923
1924 // Todo: inline this for optimization
1925 void JvmtiExport::post_single_step(JavaThread *thread, Method* method, address location) {
1926 HandleMark hm(thread);
1927 methodHandle mh(thread, method);
1928
1929 JvmtiThreadState *state = thread->jvmti_thread_state();
1930 if (state == NULL) {
1931 return;
1932 }
1933 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1934 return; // no events should be posted if thread is in any VTMS transition
1935 }
1936
1937 JvmtiEnvThreadStateIterator it(state);
1938 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1939 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_SINGLE_STEP);
1940 if (!ets->single_stepping_posted() && ets->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1941 EVT_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Evt Single Step sent %s.%s @ " INTX_FORMAT,
1942 JvmtiTrace::safe_get_thread_name(thread),
1943 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1944 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1945 location - mh()->code_base() ));
1946
1947 JvmtiEnv *env = ets->get_env();
1948 JvmtiLocationEventMark jem(thread, mh, location);
1949 JvmtiJavaThreadEventTransition jet(thread);
1950 jvmtiEventSingleStep callback = env->callbacks()->SingleStep;
1951 if (callback != NULL) {
1952 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1953 jem.jni_methodID(), jem.location());
1954 }
1955
1956 ets->set_single_stepping_posted();
1957 }
1958 }
1959 }
1960
1961 void JvmtiExport::post_exception_throw(JavaThread *thread, Method* method, address location, oop exception) {
1962 HandleMark hm(thread);
1963 methodHandle mh(thread, method);
1964 Handle exception_handle(thread, exception);
1965
1966 JvmtiThreadState *state = thread->jvmti_thread_state();
1967 if (state == NULL) {
1968 return;
1969 }
1970 if (thread->is_in_any_VTMS_transition()) {
1971 return; // no events should be posted if thread is in any VTMS transition
1972 }
1973
1974 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION, ("[%s] Trg Exception thrown triggered",
1975 JvmtiTrace::safe_get_thread_name(thread)));
1976 if (!state->is_exception_detected()) {
1977 state->set_exception_detected();
1978 JvmtiEnvThreadStateIterator it(state);
1979 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1980 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION) && (exception != NULL)) {
1981
1982 EVT_TRACE(JVMTI_EVENT_EXCEPTION,
1983 ("[%s] Evt Exception thrown sent %s.%s @ " INTX_FORMAT,
1984 JvmtiTrace::safe_get_thread_name(thread),
1985 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1986 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1987 location - mh()->code_base() ));
1988
1989 JvmtiEnv *env = ets->get_env();
1990 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
1991
1992 // It's okay to clear these exceptions here because we duplicate
1993 // this lookup in InterpreterRuntime::exception_handler_for_exception.
1994 EXCEPTION_MARK;
1995
1996 bool should_repeat;
1997 vframeStream st(thread);
1998 assert(!st.at_end(), "cannot be at end");
1999 Method* current_method = NULL;
2000 // A GC may occur during the Method::fast_exception_handler_bci_for()
2001 // call below if it needs to load the constraint class. Using a
2002 // methodHandle to keep the 'current_method' from being deallocated
2003 // if GC happens.
2004 methodHandle current_mh = methodHandle(thread, current_method);
2005 int current_bci = -1;
2006 do {
2007 current_method = st.method();
2008 current_mh = methodHandle(thread, current_method);
2009 current_bci = st.bci();
2010 do {
2011 should_repeat = false;
2012 Klass* eh_klass = exception_handle()->klass();
2013 current_bci = Method::fast_exception_handler_bci_for(
2014 current_mh, eh_klass, current_bci, THREAD);
2015 if (HAS_PENDING_EXCEPTION) {
2016 exception_handle = Handle(thread, PENDING_EXCEPTION);
2017 CLEAR_PENDING_EXCEPTION;
2018 should_repeat = true;
2019 }
2020 } while (should_repeat && (current_bci != -1));
2021 st.next();
2022 } while ((current_bci < 0) && (!st.at_end()));
2023
2024 jmethodID catch_jmethodID;
2025 if (current_bci < 0) {
2026 catch_jmethodID = 0;
2027 current_bci = 0;
2028 } else {
2029 catch_jmethodID = jem.to_jmethodID(current_mh);
2030 }
2031
2032 JvmtiJavaThreadEventTransition jet(thread);
2033 jvmtiEventException callback = env->callbacks()->Exception;
2034 if (callback != NULL) {
2035 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2036 jem.jni_methodID(), jem.location(),
2037 jem.exception(),
2038 catch_jmethodID, current_bci);
2039 }
2040 }
2041 }
2042 }
2043
2044 // frames may get popped because of this throw, be safe - invalidate cached depth
2045 state->invalidate_cur_stack_depth();
2046 }
2047
2048
2049 void JvmtiExport::notice_unwind_due_to_exception(JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) {
2050 HandleMark hm(thread);
2051 methodHandle mh(thread, method);
2052 Handle exception_handle(thread, exception);
2053
2054 JvmtiThreadState *state = thread->jvmti_thread_state();
2055 if (state == NULL) {
2056 return;
2057 }
2058 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
2059 ("[%s] Trg unwind_due_to_exception triggered %s.%s @ %s" INTX_FORMAT " - %s",
2060 JvmtiTrace::safe_get_thread_name(thread),
2061 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
2062 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
2063 location==0? "no location:" : "",
2064 location==0? 0 : location - mh()->code_base(),
2065 in_handler_frame? "in handler frame" : "not handler frame" ));
2066
2067 if (state->is_exception_detected()) {
2068
2069 state->invalidate_cur_stack_depth();
2070 if (!in_handler_frame) {
2071 // Not in exception handler.
2072 if(state->is_interp_only_mode()) {
2073 // method exit and frame pop events are posted only in interp mode.
2074 // When these events are enabled code should be in running in interp mode.
2075 jvalue no_value;
2076 no_value.j = 0L;
2077 JvmtiExport::post_method_exit_inner(thread, mh, state, true, thread->last_frame(), no_value);
2078 // The cached cur_stack_depth might have changed from the
2079 // operations of frame pop or method exit. We are not 100% sure
2080 // the cached cur_stack_depth is still valid depth so invalidate
2081 // it.
2082 state->invalidate_cur_stack_depth();
2083 }
2084 } else {
2085 // In exception handler frame. Report exception catch.
2086 assert(location != NULL, "must be a known location");
2087 // Update cur_stack_depth - the frames above the current frame
2088 // have been unwound due to this exception:
2089 assert(!state->is_exception_caught(), "exception must not be caught yet.");
2090 state->set_exception_caught();
2091
2092 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
2093 return; // no events should be posted if thread is in any VTMS transition
2094 }
2095 JvmtiEnvThreadStateIterator it(state);
2096 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2097 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION_CATCH) && (exception_handle() != NULL)) {
2098 EVT_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
2099 ("[%s] Evt ExceptionCatch sent %s.%s @ " INTX_FORMAT,
2100 JvmtiTrace::safe_get_thread_name(thread),
2101 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
2102 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
2103 location - mh()->code_base() ));
2104
2105 JvmtiEnv *env = ets->get_env();
2106 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
2107 JvmtiJavaThreadEventTransition jet(thread);
2108 jvmtiEventExceptionCatch callback = env->callbacks()->ExceptionCatch;
2109 if (callback != NULL) {
2110 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2111 jem.jni_methodID(), jem.location(),
2112 jem.exception());
2113 }
2114 }
2115 }
2116 }
2117 }
2118 }
2119
2120 oop JvmtiExport::jni_GetField_probe(JavaThread *thread, jobject jobj, oop obj,
2121 Klass* klass, jfieldID fieldID, bool is_static) {
2122 if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) {
2123 // At least one field access watch is set so we have more work to do.
2124 post_field_access_by_jni(thread, obj, klass, fieldID, is_static);
2125 // event posting can block so refetch oop if we were passed a jobj
2126 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
2127 }
2128 return obj;
2129 }
2130
2131 void JvmtiExport::post_field_access_by_jni(JavaThread *thread, oop obj,
2132 Klass* klass, jfieldID fieldID, bool is_static) {
2133 // We must be called with a Java context in order to provide reasonable
2134 // values for the klazz, method, and location fields. The callers of this
2135 // function don't make the call unless there is a Java context.
2136 assert(thread->has_last_Java_frame(), "must be called with a Java context");
2137
2138 if (thread->is_in_any_VTMS_transition()) {
2139 return; // no events should be posted if thread is in any VTMS transition
2140 }
2141
2142 ResourceMark rm;
2143 fieldDescriptor fd;
2144 // if get_field_descriptor finds fieldID to be invalid, then we just bail
2145 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
2146 assert(valid_fieldID == true,"post_field_access_by_jni called with invalid fieldID");
2147 if (!valid_fieldID) return;
2148 // field accesses are not watched so bail
2149 if (!fd.is_field_access_watched()) return;
2150
2151 HandleMark hm(thread);
2152 Handle h_obj;
2153 if (!is_static) {
2154 // non-static field accessors have an object, but we need a handle
2155 assert(obj != NULL, "non-static needs an object");
2156 h_obj = Handle(thread, obj);
2157 }
2158 post_field_access(thread,
2159 thread->last_frame().interpreter_frame_method(),
2160 thread->last_frame().interpreter_frame_bcp(),
2161 klass, h_obj, fieldID);
2162 }
2163
2164 void JvmtiExport::post_field_access(JavaThread *thread, Method* method,
2165 address location, Klass* field_klass, Handle object, jfieldID field) {
2166
2167 HandleMark hm(thread);
2168 methodHandle mh(thread, method);
2169
2170 JvmtiThreadState *state = thread->jvmti_thread_state();
2171 if (state == NULL) {
2172 return;
2173 }
2174 if (thread->is_in_any_VTMS_transition()) {
2175 return; // no events should be posted if thread is in any VTMS transition
2176 }
2177
2178 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Trg Field Access event triggered",
2179 JvmtiTrace::safe_get_thread_name(thread)));
2180 JvmtiEnvThreadStateIterator it(state);
2181 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2182 if (ets->is_enabled(JVMTI_EVENT_FIELD_ACCESS)) {
2183 EVT_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Evt Field Access event sent %s.%s @ " INTX_FORMAT,
2184 JvmtiTrace::safe_get_thread_name(thread),
2185 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
2186 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
2187 location - mh()->code_base() ));
2188
2189 JvmtiEnv *env = ets->get_env();
2190 JvmtiLocationEventMark jem(thread, mh, location);
2191 jclass field_jclass = jem.to_jclass(field_klass);
2192 jobject field_jobject = jem.to_jobject(object());
2193 JvmtiJavaThreadEventTransition jet(thread);
2194 jvmtiEventFieldAccess callback = env->callbacks()->FieldAccess;
2195 if (callback != NULL) {
2196 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2197 jem.jni_methodID(), jem.location(),
2198 field_jclass, field_jobject, field);
2199 }
2200 }
2201 }
2202 }
2203
2204 oop JvmtiExport::jni_SetField_probe(JavaThread *thread, jobject jobj, oop obj,
2205 Klass* klass, jfieldID fieldID, bool is_static,
2206 char sig_type, jvalue *value) {
2207 if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) {
2208 // At least one field modification watch is set so we have more work to do.
2209 post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value);
2210 // event posting can block so refetch oop if we were passed a jobj
2211 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
2212 }
2213 return obj;
2214 }
2215
2216 void JvmtiExport::post_field_modification_by_jni(JavaThread *thread, oop obj,
2217 Klass* klass, jfieldID fieldID, bool is_static,
2218 char sig_type, jvalue *value) {
2219 // We must be called with a Java context in order to provide reasonable
2220 // values for the klazz, method, and location fields. The callers of this
2221 // function don't make the call unless there is a Java context.
2222 assert(thread->has_last_Java_frame(), "must be called with Java context");
2223
2224 if (thread->is_in_any_VTMS_transition()) {
2225 return; // no events should be posted if thread is in any VTMS transition
2226 }
2227
2228 ResourceMark rm;
2229 fieldDescriptor fd;
2230 // if get_field_descriptor finds fieldID to be invalid, then we just bail
2231 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
2232 assert(valid_fieldID == true,"post_field_modification_by_jni called with invalid fieldID");
2233 if (!valid_fieldID) return;
2234 // field modifications are not watched so bail
2235 if (!fd.is_field_modification_watched()) return;
2236
2237 HandleMark hm(thread);
2238
2239 Handle h_obj;
2240 if (!is_static) {
2241 // non-static field accessors have an object, but we need a handle
2242 assert(obj != NULL, "non-static needs an object");
2243 h_obj = Handle(thread, obj);
2244 }
2245 post_field_modification(thread,
2246 thread->last_frame().interpreter_frame_method(),
2247 thread->last_frame().interpreter_frame_bcp(),
2248 klass, h_obj, fieldID, sig_type, value);
2249 }
2250
2251 void JvmtiExport::post_raw_field_modification(JavaThread *thread, Method* method,
2252 address location, Klass* field_klass, Handle object, jfieldID field,
2253 char sig_type, jvalue *value) {
2254
2255 if (thread->is_in_any_VTMS_transition()) {
2256 return; // no events should be posted if thread is in any VTMS transition
2257 }
2258
2259 if (sig_type == JVM_SIGNATURE_INT || sig_type == JVM_SIGNATURE_BOOLEAN ||
2260 sig_type == JVM_SIGNATURE_BYTE || sig_type == JVM_SIGNATURE_CHAR ||
2261 sig_type == JVM_SIGNATURE_SHORT) {
2262 // 'I' instructions are used for byte, char, short and int.
2263 // determine which it really is, and convert
2264 fieldDescriptor fd;
2265 bool found = JvmtiEnv::get_field_descriptor(field_klass, field, &fd);
2266 // should be found (if not, leave as is)
2267 if (found) {
2268 jint ival = value->i;
2269 // convert value from int to appropriate type
2270 switch (fd.field_type()) {
2271 case T_BOOLEAN:
2272 sig_type = JVM_SIGNATURE_BOOLEAN;
2273 value->i = 0; // clear it
2274 value->z = (jboolean)ival;
2275 break;
2276 case T_BYTE:
2277 sig_type = JVM_SIGNATURE_BYTE;
2278 value->i = 0; // clear it
2279 value->b = (jbyte)ival;
2280 break;
2281 case T_CHAR:
2282 sig_type = JVM_SIGNATURE_CHAR;
2283 value->i = 0; // clear it
2284 value->c = (jchar)ival;
2285 break;
2286 case T_SHORT:
2287 sig_type = JVM_SIGNATURE_SHORT;
2288 value->i = 0; // clear it
2289 value->s = (jshort)ival;
2290 break;
2291 case T_INT:
2292 // nothing to do
2293 break;
2294 default:
2295 // this is an integer instruction, should be one of above
2296 ShouldNotReachHere();
2297 break;
2298 }
2299 }
2300 }
2301
2302 assert(sig_type != JVM_SIGNATURE_ARRAY, "array should have sig_type == 'L'");
2303 bool handle_created = false;
2304
2305 // convert oop to JNI handle.
2306 if (sig_type == JVM_SIGNATURE_CLASS || sig_type == JVM_SIGNATURE_PRIMITIVE_OBJECT) {
2307 handle_created = true;
2308 value->l = (jobject)JNIHandles::make_local(thread, cast_to_oop(value->l));
2309 }
2310
2311 post_field_modification(thread, method, location, field_klass, object, field, sig_type, value);
2312
2313 // Destroy the JNI handle allocated above.
2314 if (handle_created) {
2315 JNIHandles::destroy_local(value->l);
2316 }
2317 }
2318
2319 void JvmtiExport::post_field_modification(JavaThread *thread, Method* method,
2320 address location, Klass* field_klass, Handle object, jfieldID field,
2321 char sig_type, jvalue *value_ptr) {
2322
2323 HandleMark hm(thread);
2324 methodHandle mh(thread, method);
2325
2326 JvmtiThreadState *state = thread->jvmti_thread_state();
2327 if (state == NULL) {
2328 return;
2329 }
2330 if (thread->is_in_any_VTMS_transition()) {
2331 return; // no events should be posted if thread is in any VTMS transition
2332 }
2333
2334 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
2335 ("[%s] Trg Field Modification event triggered",
2336 JvmtiTrace::safe_get_thread_name(thread)));
2337 JvmtiEnvThreadStateIterator it(state);
2338 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2339 if (ets->is_enabled(JVMTI_EVENT_FIELD_MODIFICATION)) {
2340 EVT_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
2341 ("[%s] Evt Field Modification event sent %s.%s @ " INTX_FORMAT,
2342 JvmtiTrace::safe_get_thread_name(thread),
2343 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
2344 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
2345 location - mh()->code_base() ));
2346
2347 JvmtiEnv *env = ets->get_env();
2348 JvmtiLocationEventMark jem(thread, mh, location);
2349 jclass field_jclass = jem.to_jclass(field_klass);
2350 jobject field_jobject = jem.to_jobject(object());
2351 JvmtiJavaThreadEventTransition jet(thread);
2352 jvmtiEventFieldModification callback = env->callbacks()->FieldModification;
2353 if (callback != NULL) {
2354 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2355 jem.jni_methodID(), jem.location(),
2356 field_jclass, field_jobject, field, sig_type, *value_ptr);
2357 }
2358 }
2359 }
2360 }
2361
2362 void JvmtiExport::post_native_method_bind(Method* method, address* function_ptr) {
2363 JavaThread* thread = JavaThread::current();
2364 assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
2365
2366 HandleMark hm(thread);
2367 methodHandle mh(thread, method);
2368
2369 if (thread->is_in_any_VTMS_transition()) {
2370 return; // no events should be posted if thread is in any VTMS transition
2371 }
2372 EVT_TRIG_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Trg Native Method Bind event triggered",
2373 JvmtiTrace::safe_get_thread_name(thread)));
2374
2375 if (JvmtiEventController::is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
2376 JvmtiEnvIterator it;
2377 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2378 if (env->is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
2379 EVT_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Evt Native Method Bind event sent",
2380 JvmtiTrace::safe_get_thread_name(thread) ));
2381
2382 JvmtiMethodEventMark jem(thread, mh);
2383 JvmtiJavaThreadEventTransition jet(thread);
2384 JNIEnv* jni_env = (env->phase() == JVMTI_PHASE_PRIMORDIAL) ? NULL : jem.jni_env();
2385 jvmtiEventNativeMethodBind callback = env->callbacks()->NativeMethodBind;
2386 if (callback != NULL) {
2387 (*callback)(env->jvmti_external(), jni_env, jem.jni_thread(),
2388 jem.jni_methodID(), (void*)(*function_ptr), (void**)function_ptr);
2389 }
2390 }
2391 }
2392 }
2393 }
2394
2395 // Returns a record containing inlining information for the given nmethod
2396 jvmtiCompiledMethodLoadInlineRecord* create_inline_record(nmethod* nm) {
2397 jint numstackframes = 0;
2398 jvmtiCompiledMethodLoadInlineRecord* record = (jvmtiCompiledMethodLoadInlineRecord*)NEW_RESOURCE_OBJ(jvmtiCompiledMethodLoadInlineRecord);
2399 record->header.kind = JVMTI_CMLR_INLINE_INFO;
2400 record->header.next = NULL;
2401 record->header.majorinfoversion = JVMTI_CMLR_MAJOR_VERSION_1;
2402 record->header.minorinfoversion = JVMTI_CMLR_MINOR_VERSION_0;
2403 record->numpcs = 0;
2404 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
2405 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
2406 record->numpcs++;
2407 }
2408 record->pcinfo = (PCStackInfo*)(NEW_RESOURCE_ARRAY(PCStackInfo, record->numpcs));
2409 int scope = 0;
2410 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
2411 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
2412 void* pc_address = (void*)p->real_pc(nm);
2413 assert(pc_address != NULL, "pc_address must be non-null");
2414 record->pcinfo[scope].pc = pc_address;
2415 numstackframes=0;
2416 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != NULL;sd = sd->sender()) {
2417 numstackframes++;
2418 }
2419 assert(numstackframes != 0, "numstackframes must be nonzero.");
2420 record->pcinfo[scope].methods = (jmethodID *)NEW_RESOURCE_ARRAY(jmethodID, numstackframes);
2421 record->pcinfo[scope].bcis = (jint *)NEW_RESOURCE_ARRAY(jint, numstackframes);
2422 record->pcinfo[scope].numstackframes = numstackframes;
2423 int stackframe = 0;
2424 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != NULL;sd = sd->sender()) {
2425 // 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()
2426 guarantee(sd->method() != NULL, "sd->method() cannot be null.");
2427 record->pcinfo[scope].methods[stackframe] = sd->method()->jmethod_id();
2428 record->pcinfo[scope].bcis[stackframe] = sd->bci();
2429 stackframe++;
2430 }
2431 scope++;
2432 }
2433 return record;
2434 }
2435
2436 void JvmtiExport::post_compiled_method_load(nmethod *nm) {
2437 guarantee(!nm->is_unloading(), "nmethod isn't unloaded or unloading");
2438 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
2439 return;
2440 }
2441 JavaThread* thread = JavaThread::current();
2442
2443 assert(!thread->is_in_any_VTMS_transition(), "compiled method load events are not allowed in any VTMS transition");
2444
2445 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2446 ("[%s] method compile load event triggered",
2447 JvmtiTrace::safe_get_thread_name(thread)));
2448
2449 JvmtiEnvIterator it;
2450 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2451 post_compiled_method_load(env, nm);
2452 }
2453 }
2454
2455 // post a COMPILED_METHOD_LOAD event for a given environment
2456 void JvmtiExport::post_compiled_method_load(JvmtiEnv* env, nmethod *nm) {
2457 if (env->phase() == JVMTI_PHASE_PRIMORDIAL || !env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) {
2458 return;
2459 }
2460 jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad;
2461 if (callback == NULL) {
2462 return;
2463 }
2464 JavaThread* thread = JavaThread::current();
2465
2466 assert(!thread->is_in_any_VTMS_transition(), "compiled method load events are not allowed in any VTMS transition");
2467
2468 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2469 ("[%s] method compile load event sent %s.%s ",
2470 JvmtiTrace::safe_get_thread_name(thread),
2471 (nm->method() == NULL) ? "NULL" : nm->method()->klass_name()->as_C_string(),
2472 (nm->method() == NULL) ? "NULL" : nm->method()->name()->as_C_string()));
2473 ResourceMark rm(thread);
2474 HandleMark hm(thread);
2475
2476 // Add inlining information
2477 jvmtiCompiledMethodLoadInlineRecord* inlinerecord = create_inline_record(nm);
2478 // Pass inlining information through the void pointer
2479 JvmtiCompiledMethodLoadEventMark jem(thread, nm, inlinerecord);
2480 JvmtiJavaThreadEventTransition jet(thread);
2481 (*callback)(env->jvmti_external(), jem.jni_methodID(),
2482 jem.code_size(), jem.code_data(), jem.map_length(),
2483 jem.map(), jem.compile_info());
2484 }
2485
2486 void JvmtiExport::post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) {
2487 assert(name != NULL && name[0] != '\0', "sanity check");
2488
2489 JavaThread* thread = JavaThread::current();
2490
2491 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition");
2492
2493 // In theory everyone coming thru here is in_vm but we need to be certain
2494 // because a callee will do a vm->native transition
2495 ThreadInVMfromUnknown __tiv;
2496
2497 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2498 ("[%s] method dynamic code generated event triggered",
2499 JvmtiTrace::safe_get_thread_name(thread)));
2500 JvmtiEnvIterator it;
2501 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2502 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
2503 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2504 ("[%s] dynamic code generated event sent for %s",
2505 JvmtiTrace::safe_get_thread_name(thread), name));
2506 JvmtiEventMark jem(thread);
2507 JvmtiJavaThreadEventTransition jet(thread);
2508 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
2509 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
2510 if (callback != NULL) {
2511 (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
2512 }
2513 }
2514 }
2515 }
2516
2517 void JvmtiExport::post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) {
2518 jvmtiPhase phase = JvmtiEnv::get_phase();
2519 if (phase == JVMTI_PHASE_PRIMORDIAL || phase == JVMTI_PHASE_START) {
2520 post_dynamic_code_generated_internal(name, code_begin, code_end);
2521 } else {
2522 // It may not be safe to post the event from this thread. Defer all
2523 // postings to the service thread so that it can perform them in a safe
2524 // context and in-order.
2525 JvmtiDeferredEvent event = JvmtiDeferredEvent::dynamic_code_generated_event(
2526 name, code_begin, code_end);
2527 ServiceThread::enqueue_deferred_event(&event);
2528 }
2529 }
2530
2531
2532 // post a DYNAMIC_CODE_GENERATED event for a given environment
2533 // used by GenerateEvents
2534 void JvmtiExport::post_dynamic_code_generated(JvmtiEnv* env, const char *name,
2535 const void *code_begin, const void *code_end)
2536 {
2537 JavaThread* thread = JavaThread::current();
2538
2539 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition");
2540
2541 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2542 ("[%s] dynamic code generated event triggered (by GenerateEvents)",
2543 JvmtiTrace::safe_get_thread_name(thread)));
2544 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
2545 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2546 ("[%s] dynamic code generated event sent for %s",
2547 JvmtiTrace::safe_get_thread_name(thread), name));
2548 JvmtiEventMark jem(thread);
2549 JvmtiJavaThreadEventTransition jet(thread);
2550 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
2551 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
2552 if (callback != NULL) {
2553 (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
2554 }
2555 }
2556 }
2557
2558 // post a DynamicCodeGenerated event while holding locks in the VM.
2559 void JvmtiExport::post_dynamic_code_generated_while_holding_locks(const char* name,
2560 address code_begin, address code_end)
2561 {
2562 JavaThread* thread = JavaThread::current();
2563 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition");
2564
2565 // register the stub with the current dynamic code event collector
2566 // Cannot take safepoint here so do not use state_for to get
2567 // jvmti thread state.
2568 // The collector and/or state might be NULL if JvmtiDynamicCodeEventCollector
2569 // has been initialized while JVMTI_EVENT_DYNAMIC_CODE_GENERATED was disabled.
2570 JvmtiThreadState* state = thread->jvmti_thread_state();
2571 if (state != NULL) {
2572 JvmtiDynamicCodeEventCollector *collector = state->get_dynamic_code_event_collector();
2573 if (collector != NULL) {
2574 collector->register_stub(name, code_begin, code_end);
2575 }
2576 }
2577 }
2578
2579 // Collect all the vm internally allocated objects which are visible to java world
2580 void JvmtiExport::record_vm_internal_object_allocation(oop obj) {
2581 Thread* thread = Thread::current_or_null();
2582 if (thread != NULL && thread->is_Java_thread()) {
2583 // Can not take safepoint here.
2584 NoSafepointVerifier no_sfpt;
2585 // Cannot take safepoint here so do not use state_for to get
2586 // jvmti thread state.
2587 JvmtiThreadState *state = JavaThread::cast(thread)->jvmti_thread_state();
2588 if (state != NULL) {
2589 // state is non NULL when VMObjectAllocEventCollector is enabled.
2590 JvmtiVMObjectAllocEventCollector *collector;
2591 collector = state->get_vm_object_alloc_event_collector();
2592 if (collector != NULL && collector->is_enabled()) {
2593 // Don't record classes as these will be notified via the ClassLoad
2594 // event.
2595 if (obj->klass() != vmClasses::Class_klass()) {
2596 collector->record_allocation(obj);
2597 }
2598 }
2599 }
2600 }
2601 }
2602
2603 // Collect all the sampled allocated objects.
2604 void JvmtiExport::record_sampled_internal_object_allocation(oop obj) {
2605 Thread* thread = Thread::current_or_null();
2606 if (thread != NULL && thread->is_Java_thread()) {
2607 // Can not take safepoint here.
2608 NoSafepointVerifier no_sfpt;
2609 // Cannot take safepoint here so do not use state_for to get
2610 // jvmti thread state.
2611 JvmtiThreadState *state = JavaThread::cast(thread)->jvmti_thread_state();
2612 if (state != NULL) {
2613 // state is non NULL when SampledObjectAllocEventCollector is enabled.
2614 JvmtiSampledObjectAllocEventCollector *collector;
2615 collector = state->get_sampled_object_alloc_event_collector();
2616
2617 if (collector != NULL && collector->is_enabled()) {
2618 collector->record_allocation(obj);
2619 }
2620 }
2621 }
2622 }
2623
2624 void JvmtiExport::post_garbage_collection_finish() {
2625 Thread *thread = Thread::current(); // this event is posted from VM-Thread.
2626 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
2627 ("[%s] garbage collection finish event triggered",
2628 JvmtiTrace::safe_get_thread_name(thread)));
2629 JvmtiEnvIterator it;
2630 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2631 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH)) {
2632 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
2633 ("[%s] garbage collection finish event sent",
2634 JvmtiTrace::safe_get_thread_name(thread)));
2635 JvmtiThreadEventTransition jet(thread);
2636 // JNIEnv is NULL here because this event is posted from VM Thread
2637 jvmtiEventGarbageCollectionFinish callback = env->callbacks()->GarbageCollectionFinish;
2638 if (callback != NULL) {
2639 (*callback)(env->jvmti_external());
2640 }
2641 }
2642 }
2643 }
2644
2645 void JvmtiExport::post_garbage_collection_start() {
2646 Thread* thread = Thread::current(); // this event is posted from vm-thread.
2647 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
2648 ("[%s] garbage collection start event triggered",
2649 JvmtiTrace::safe_get_thread_name(thread)));
2650 JvmtiEnvIterator it;
2651 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2652 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_START)) {
2653 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
2654 ("[%s] garbage collection start event sent",
2655 JvmtiTrace::safe_get_thread_name(thread)));
2656 JvmtiThreadEventTransition jet(thread);
2657 // JNIEnv is NULL here because this event is posted from VM Thread
2658 jvmtiEventGarbageCollectionStart callback = env->callbacks()->GarbageCollectionStart;
2659 if (callback != NULL) {
2660 (*callback)(env->jvmti_external());
2661 }
2662 }
2663 }
2664 }
2665
2666 void JvmtiExport::post_data_dump() {
2667 Thread *thread = Thread::current();
2668 EVT_TRIG_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
2669 ("[%s] data dump request event triggered",
2670 JvmtiTrace::safe_get_thread_name(thread)));
2671 JvmtiEnvIterator it;
2672 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2673 if (env->is_enabled(JVMTI_EVENT_DATA_DUMP_REQUEST)) {
2674 EVT_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
2675 ("[%s] data dump request event sent",
2676 JvmtiTrace::safe_get_thread_name(thread)));
2677 JvmtiThreadEventTransition jet(thread);
2678 // JNIEnv is NULL here because this event is posted from VM Thread
2679 jvmtiEventDataDumpRequest callback = env->callbacks()->DataDumpRequest;
2680 if (callback != NULL) {
2681 (*callback)(env->jvmti_external());
2682 }
2683 }
2684 }
2685 }
2686
2687 void JvmtiExport::post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) {
2688 oop object = obj_mntr->object();
2689 JvmtiThreadState *state = thread->jvmti_thread_state();
2690 if (state == NULL) {
2691 return;
2692 }
2693 if (thread->is_in_any_VTMS_transition()) {
2694 return; // no events should be posted if thread is in any VTMS transition
2695 }
2696
2697 HandleMark hm(thread);
2698 Handle h(thread, object);
2699
2700 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2701 ("[%s] monitor contended enter event triggered",
2702 JvmtiTrace::safe_get_thread_name(thread)));
2703 JvmtiEnvThreadStateIterator it(state);
2704 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2705 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTER)) {
2706 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2707 ("[%s] monitor contended enter event sent",
2708 JvmtiTrace::safe_get_thread_name(thread)));
2709 JvmtiMonitorEventMark jem(thread, h());
2710 JvmtiEnv *env = ets->get_env();
2711 JvmtiThreadEventTransition jet(thread);
2712 jvmtiEventMonitorContendedEnter callback = env->callbacks()->MonitorContendedEnter;
2713 if (callback != NULL) {
2714 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2715 }
2716 }
2717 }
2718 }
2719
2720 void JvmtiExport::post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) {
2721 oop object = obj_mntr->object();
2722 JvmtiThreadState *state = thread->jvmti_thread_state();
2723 if (state == NULL) {
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_ENTERED,
2734 ("[%s] monitor contended entered event triggered",
2735 JvmtiTrace::safe_get_thread_name(thread)));
2736
2737 JvmtiEnvThreadStateIterator it(state);
2738 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2739 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED)) {
2740 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2741 ("[%s] monitor contended enter event sent",
2742 JvmtiTrace::safe_get_thread_name(thread)));
2743 JvmtiMonitorEventMark jem(thread, h());
2744 JvmtiEnv *env = ets->get_env();
2745 JvmtiThreadEventTransition jet(thread);
2746 jvmtiEventMonitorContendedEntered callback = env->callbacks()->MonitorContendedEntered;
2747 if (callback != NULL) {
2748 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2749 }
2750 }
2751 }
2752 }
2753
2754 void JvmtiExport::post_monitor_wait(JavaThread *thread, oop object,
2755 jlong timeout) {
2756 JvmtiThreadState *state = thread->jvmti_thread_state();
2757 if (state == NULL) {
2758 return;
2759 }
2760 if (thread->is_in_any_VTMS_transition()) {
2761 return; // no events should be posted if thread is in any VTMS transition
2762 }
2763
2764 HandleMark hm(thread);
2765 Handle h(thread, object);
2766
2767 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2768 ("[%s] monitor wait event triggered",
2769 JvmtiTrace::safe_get_thread_name(thread)));
2770 JvmtiEnvThreadStateIterator it(state);
2771 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2772 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAIT)) {
2773 EVT_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2774 ("[%s] monitor wait 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 jvmtiEventMonitorWait callback = env->callbacks()->MonitorWait;
2780 if (callback != NULL) {
2781 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2782 jem.jni_object(), timeout);
2783 }
2784 }
2785 }
2786 }
2787
2788 void JvmtiExport::post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) {
2789 oop object = obj_mntr->object();
2790 JvmtiThreadState *state = thread->jvmti_thread_state();
2791 if (state == NULL) {
2792 return;
2793 }
2794 if (thread->is_in_any_VTMS_transition()) {
2795 return; // no events should be posted if thread is in any VTMS transition
2796 }
2797
2798 HandleMark hm(thread);
2799 Handle h(thread, object);
2800
2801 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2802 ("[%s] monitor waited event triggered",
2803 JvmtiTrace::safe_get_thread_name(thread)));
2804 JvmtiEnvThreadStateIterator it(state);
2805 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2806 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAITED)) {
2807 EVT_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2808 ("[%s] monitor waited event sent",
2809 JvmtiTrace::safe_get_thread_name(thread)));
2810 JvmtiMonitorEventMark jem(thread, h());
2811 JvmtiEnv *env = ets->get_env();
2812 JvmtiThreadEventTransition jet(thread);
2813 jvmtiEventMonitorWaited callback = env->callbacks()->MonitorWaited;
2814 if (callback != NULL) {
2815 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2816 jem.jni_object(), timed_out);
2817 }
2818 }
2819 }
2820 }
2821
2822 void JvmtiExport::post_vm_object_alloc(JavaThread *thread, oop object) {
2823 if (object == NULL) {
2824 return;
2825 }
2826 if (thread->is_in_any_VTMS_transition()) {
2827 return; // no events should be posted if thread is in any VTMS transition
2828 }
2829 HandleMark hm(thread);
2830 Handle h(thread, object);
2831
2832 EVT_TRIG_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Trg vm object alloc triggered",
2833 JvmtiTrace::safe_get_thread_name(thread)));
2834 JvmtiEnvIterator it;
2835 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2836 if (env->is_enabled(JVMTI_EVENT_VM_OBJECT_ALLOC)) {
2837 EVT_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Evt vmobject alloc sent %s",
2838 JvmtiTrace::safe_get_thread_name(thread),
2839 object==NULL? "NULL" : object->klass()->external_name()));
2840
2841 JvmtiObjectAllocEventMark jem(thread, h());
2842 JvmtiJavaThreadEventTransition jet(thread);
2843 jvmtiEventVMObjectAlloc callback = env->callbacks()->VMObjectAlloc;
2844 if (callback != NULL) {
2845 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2846 jem.jni_jobject(), jem.jni_class(), jem.size());
2847 }
2848 }
2849 }
2850 }
2851
2852 void JvmtiExport::post_sampled_object_alloc(JavaThread *thread, oop object) {
2853 JvmtiThreadState *state = thread->jvmti_thread_state();
2854 if (state == NULL) {
2855 return;
2856 }
2857 if (object == NULL) {
2858 return;
2859 }
2860 if (thread->is_in_any_VTMS_transition()) {
2861 return; // no events should be posted if thread is in any VTMS transition
2862 }
2863 HandleMark hm(thread);
2864 Handle h(thread, object);
2865
2866 EVT_TRIG_TRACE(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC,
2867 ("[%s] Trg sampled object alloc triggered",
2868 JvmtiTrace::safe_get_thread_name(thread)));
2869 JvmtiEnvThreadStateIterator it(state);
2870 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2871 if (ets->is_enabled(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC)) {
2872 EVT_TRACE(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC,
2873 ("[%s] Evt sampled object alloc sent %s",
2874 JvmtiTrace::safe_get_thread_name(thread),
2875 object == NULL ? "NULL" : object->klass()->external_name()));
2876
2877 JvmtiEnv *env = ets->get_env();
2878 JvmtiObjectAllocEventMark jem(thread, h());
2879 JvmtiJavaThreadEventTransition jet(thread);
2880 jvmtiEventSampledObjectAlloc callback = env->callbacks()->SampledObjectAlloc;
2881 if (callback != NULL) {
2882 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2883 jem.jni_jobject(), jem.jni_class(), jem.size());
2884 }
2885 }
2886 }
2887 }
2888
2889 ////////////////////////////////////////////////////////////////////////////////////////////////
2890
2891 void JvmtiExport::cleanup_thread(JavaThread* thread) {
2892 assert(JavaThread::current() == thread, "thread is not current");
2893 MutexLocker mu(thread, JvmtiThreadState_lock);
2894
2895 if (thread->jvmti_thread_state() != NULL) {
2896 // This has to happen after the thread state is removed, which is
2897 // why it is not in post_thread_end_event like its complement
2898 // Maybe both these functions should be rolled into the posts?
2899 JvmtiEventController::thread_ended(thread);
2900 }
2901 }
2902
2903 void JvmtiExport::clear_detected_exception(JavaThread* thread) {
2904 assert(JavaThread::current() == thread, "thread is not current");
2905
2906 JvmtiThreadState* state = thread->jvmti_thread_state();
2907 if (state != NULL) {
2908 state->clear_exception_state();
2909 }
2910 }
2911
2912 // Onload raw monitor transition.
2913 void JvmtiExport::transition_pending_onload_raw_monitors() {
2914 JvmtiPendingMonitors::transition_raw_monitors();
2915 }
2916
2917 ////////////////////////////////////////////////////////////////////////////////////////////////
2918 #if INCLUDE_SERVICES
2919 // Attach is disabled if SERVICES is not included
2920
2921 // type for the Agent_OnAttach entry point
2922 extern "C" {
2923 typedef jint (JNICALL *OnAttachEntry_t)(JavaVM*, char *, void *);
2924 }
2925
2926 jint JvmtiExport::load_agent_library(const char *agent, const char *absParam,
2927 const char *options, outputStream* st) {
2928 char ebuf[1024] = {0};
2929 char buffer[JVM_MAXPATHLEN];
2930 void* library = NULL;
2931 jint result = JNI_ERR;
2932 const char *on_attach_symbols[] = AGENT_ONATTACH_SYMBOLS;
2933 size_t num_symbol_entries = ARRAY_SIZE(on_attach_symbols);
2934
2935 // The abs parameter should be "true" or "false"
2936 bool is_absolute_path = (absParam != NULL) && (strcmp(absParam,"true")==0);
2937
2938 // Initially marked as invalid. It will be set to valid if we can find the agent
2939 AgentLibrary *agent_lib = new AgentLibrary(agent, options, is_absolute_path, NULL);
2940
2941 // Check for statically linked in agent. If not found then if the path is
2942 // absolute we attempt to load the library. Otherwise we try to load it
2943 // from the standard dll directory.
2944
2945 if (!os::find_builtin_agent(agent_lib, on_attach_symbols, num_symbol_entries)) {
2946 if (is_absolute_path) {
2947 library = os::dll_load(agent, ebuf, sizeof ebuf);
2948 } else {
2949 // Try to load the agent from the standard dll directory
2950 if (os::dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(),
2951 agent)) {
2952 library = os::dll_load(buffer, ebuf, sizeof ebuf);
2953 }
2954 if (library == NULL) {
2955 // not found - try OS default library path
2956 if (os::dll_build_name(buffer, sizeof(buffer), agent)) {
2957 library = os::dll_load(buffer, ebuf, sizeof ebuf);
2958 }
2959 }
2960 }
2961 if (library != NULL) {
2962 agent_lib->set_os_lib(library);
2963 agent_lib->set_valid();
2964 }
2965 }
2966 // If the library was loaded then we attempt to invoke the Agent_OnAttach
2967 // function
2968 if (agent_lib->valid()) {
2969 // Lookup the Agent_OnAttach function
2970 OnAttachEntry_t on_attach_entry = NULL;
2971 on_attach_entry = CAST_TO_FN_PTR(OnAttachEntry_t,
2972 os::find_agent_function(agent_lib, false, on_attach_symbols, num_symbol_entries));
2973 if (on_attach_entry == NULL) {
2974 // Agent_OnAttach missing - unload library
2975 if (!agent_lib->is_static_lib()) {
2976 os::dll_unload(library);
2977 }
2978 st->print_cr("%s is not available in %s",
2979 on_attach_symbols[0], agent_lib->name());
2980 delete agent_lib;
2981 } else {
2982 // Invoke the Agent_OnAttach function
2983 JavaThread* THREAD = JavaThread::current(); // For exception macros.
2984 {
2985 extern struct JavaVM_ main_vm;
2986 JvmtiThreadEventMark jem(THREAD);
2987 JvmtiJavaThreadEventTransition jet(THREAD);
2988
2989 result = (*on_attach_entry)(&main_vm, (char*)options, NULL);
2990
2991 // Agent_OnAttach may have used JNI
2992 if (THREAD->is_pending_jni_exception_check()) {
2993 THREAD->clear_pending_jni_exception_check();
2994 }
2995 }
2996
2997 // Agent_OnAttach may have used JNI
2998 if (HAS_PENDING_EXCEPTION) {
2999 CLEAR_PENDING_EXCEPTION;
3000 }
3001
3002 // If OnAttach returns JNI_OK then we add it to the list of
3003 // agent libraries so that we can call Agent_OnUnload later.
3004 if (result == JNI_OK) {
3005 Arguments::add_loaded_agent(agent_lib);
3006 } else {
3007 if (!agent_lib->is_static_lib()) {
3008 os::dll_unload(library);
3009 }
3010 delete agent_lib;
3011 }
3012
3013 // Agent_OnAttach executed so completion status is JNI_OK
3014 st->print_cr("return code: %d", result);
3015 result = JNI_OK;
3016 }
3017 } else {
3018 st->print_cr("%s was not loaded.", agent);
3019 if (*ebuf != '\0') {
3020 st->print_cr("%s", ebuf);
3021 }
3022 }
3023 return result;
3024 }
3025
3026 #endif // INCLUDE_SERVICES
3027 ////////////////////////////////////////////////////////////////////////////////////////////////
3028
3029 // Setup current current thread for event collection.
3030 void JvmtiEventCollector::setup_jvmti_thread_state() {
3031 // set this event collector to be the current one.
3032 JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current());
3033 // state can only be NULL if the current thread is exiting which
3034 // should not happen since we're trying to configure for event collection
3035 guarantee(state != NULL, "exiting thread called setup_jvmti_thread_state");
3036 if (is_vm_object_alloc_event()) {
3037 JvmtiVMObjectAllocEventCollector *prev = state->get_vm_object_alloc_event_collector();
3038
3039 // If we have a previous collector and it is disabled, it means this allocation came from a
3040 // callback induced VM Object allocation, do not register this collector then.
3041 if (prev && !prev->is_enabled()) {
3042 return;
3043 }
3044 _prev = prev;
3045 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)this);
3046 } else if (is_dynamic_code_event()) {
3047 _prev = state->get_dynamic_code_event_collector();
3048 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)this);
3049 } else if (is_sampled_object_alloc_event()) {
3050 JvmtiSampledObjectAllocEventCollector *prev = state->get_sampled_object_alloc_event_collector();
3051
3052 if (prev) {
3053 // JvmtiSampledObjectAllocEventCollector wants only one active collector
3054 // enabled. This allows to have a collector detect a user code requiring
3055 // a sample in the callback.
3056 return;
3057 }
3058 state->set_sampled_object_alloc_event_collector((JvmtiSampledObjectAllocEventCollector*) this);
3059 }
3060
3061 _unset_jvmti_thread_state = true;
3062 }
3063
3064 // Unset current event collection in this thread and reset it with previous
3065 // collector.
3066 void JvmtiEventCollector::unset_jvmti_thread_state() {
3067 if (!_unset_jvmti_thread_state) {
3068 return;
3069 }
3070
3071 JvmtiThreadState* state = JavaThread::current()->jvmti_thread_state();
3072 if (state != NULL) {
3073 // restore the previous event collector (if any)
3074 if (is_vm_object_alloc_event()) {
3075 if (state->get_vm_object_alloc_event_collector() == this) {
3076 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)_prev);
3077 } else {
3078 // this thread's jvmti state was created during the scope of
3079 // the event collector.
3080 }
3081 } else if (is_dynamic_code_event()) {
3082 if (state->get_dynamic_code_event_collector() == this) {
3083 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)_prev);
3084 } else {
3085 // this thread's jvmti state was created during the scope of
3086 // the event collector.
3087 }
3088 } else if (is_sampled_object_alloc_event()) {
3089 if (state->get_sampled_object_alloc_event_collector() == this) {
3090 state->set_sampled_object_alloc_event_collector((JvmtiSampledObjectAllocEventCollector*)_prev);
3091 } else {
3092 // this thread's jvmti state was created during the scope of
3093 // the event collector.
3094 }
3095 }
3096 }
3097 }
3098
3099 // create the dynamic code event collector
3100 JvmtiDynamicCodeEventCollector::JvmtiDynamicCodeEventCollector() : _code_blobs(NULL) {
3101 if (JvmtiExport::should_post_dynamic_code_generated()) {
3102 setup_jvmti_thread_state();
3103 }
3104 }
3105
3106 // iterate over any code blob descriptors collected and post a
3107 // DYNAMIC_CODE_GENERATED event to the profiler.
3108 JvmtiDynamicCodeEventCollector::~JvmtiDynamicCodeEventCollector() {
3109 assert(!JavaThread::current()->owns_locks(), "all locks must be released to post deferred events");
3110 // iterate over any code blob descriptors that we collected
3111 if (_code_blobs != NULL) {
3112 for (int i=0; i<_code_blobs->length(); i++) {
3113 JvmtiCodeBlobDesc* blob = _code_blobs->at(i);
3114 JvmtiExport::post_dynamic_code_generated(blob->name(), blob->code_begin(), blob->code_end());
3115 FreeHeap(blob);
3116 }
3117 delete _code_blobs;
3118 }
3119 unset_jvmti_thread_state();
3120 }
3121
3122 // register a stub
3123 void JvmtiDynamicCodeEventCollector::register_stub(const char* name, address start, address end) {
3124 if (_code_blobs == NULL) {
3125 _code_blobs = new (ResourceObj::C_HEAP, mtServiceability) GrowableArray<JvmtiCodeBlobDesc*>(1, mtServiceability);
3126 }
3127 _code_blobs->append(new JvmtiCodeBlobDesc(name, start, end));
3128 }
3129
3130 // Setup current thread to record vm allocated objects.
3131 JvmtiObjectAllocEventCollector::JvmtiObjectAllocEventCollector() :
3132 _allocated(NULL), _enable(false), _post_callback(NULL) {
3133 }
3134
3135 // Post vm_object_alloc event for vm allocated objects visible to java
3136 // world.
3137 void JvmtiObjectAllocEventCollector::generate_call_for_allocated() {
3138 if (_allocated) {
3139 set_enabled(false);
3140 for (int i = 0; i < _allocated->length(); i++) {
3141 oop obj = _allocated->at(i).resolve();
3142 _post_callback(JavaThread::current(), obj);
3143 // Release OopHandle
3144 _allocated->at(i).release(JvmtiExport::jvmti_oop_storage());
3145
3146 }
3147 delete _allocated, _allocated = NULL;
3148 }
3149 }
3150
3151 void JvmtiObjectAllocEventCollector::record_allocation(oop obj) {
3152 assert(is_enabled(), "Object alloc event collector is not enabled");
3153 if (_allocated == NULL) {
3154 _allocated = new (ResourceObj::C_HEAP, mtServiceability) GrowableArray<OopHandle>(1, mtServiceability);
3155 }
3156 _allocated->push(OopHandle(JvmtiExport::jvmti_oop_storage(), obj));
3157 }
3158
3159 // Disable collection of VMObjectAlloc events
3160 NoJvmtiVMObjectAllocMark::NoJvmtiVMObjectAllocMark() : _collector(NULL) {
3161 // a no-op if VMObjectAlloc event is not enabled
3162 if (!JvmtiExport::should_post_vm_object_alloc()) {
3163 return;
3164 }
3165 Thread* thread = Thread::current_or_null();
3166 if (thread != NULL && thread->is_Java_thread()) {
3167 JavaThread* current_thread = JavaThread::cast(thread);
3168 JvmtiThreadState *state = current_thread->jvmti_thread_state();
3169 if (state != NULL) {
3170 JvmtiVMObjectAllocEventCollector *collector;
3171 collector = state->get_vm_object_alloc_event_collector();
3172 if (collector != NULL && collector->is_enabled()) {
3173 _collector = collector;
3174 _collector->set_enabled(false);
3175 }
3176 }
3177 }
3178 }
3179
3180 // Re-Enable collection of VMObjectAlloc events (if previously enabled)
3181 NoJvmtiVMObjectAllocMark::~NoJvmtiVMObjectAllocMark() {
3182 if (was_enabled()) {
3183 _collector->set_enabled(true);
3184 }
3185 };
3186
3187 // Setup current thread to record vm allocated objects.
3188 JvmtiVMObjectAllocEventCollector::JvmtiVMObjectAllocEventCollector() {
3189 if (JvmtiExport::should_post_vm_object_alloc()) {
3190 _enable = true;
3191 setup_jvmti_thread_state();
3192 _post_callback = JvmtiExport::post_vm_object_alloc;
3193 }
3194 }
3195
3196 JvmtiVMObjectAllocEventCollector::~JvmtiVMObjectAllocEventCollector() {
3197 if (_enable) {
3198 generate_call_for_allocated();
3199 }
3200 unset_jvmti_thread_state();
3201 }
3202
3203 bool JvmtiSampledObjectAllocEventCollector::object_alloc_is_safe_to_sample() {
3204 Thread* thread = Thread::current();
3205 // Really only sample allocations if this is a JavaThread and not the compiler
3206 // thread.
3207 if (!thread->is_Java_thread() || thread->is_Compiler_thread()) {
3208 return false;
3209 }
3210
3211 if (MultiArray_lock->owner() == thread) {
3212 return false;
3213 }
3214 return true;
3215 }
3216
3217 // Setup current thread to record sampled allocated objects.
3218 void JvmtiSampledObjectAllocEventCollector::start() {
3219 if (JvmtiExport::should_post_sampled_object_alloc()) {
3220 if (!object_alloc_is_safe_to_sample()) {
3221 return;
3222 }
3223
3224 _enable = true;
3225 setup_jvmti_thread_state();
3226 _post_callback = JvmtiExport::post_sampled_object_alloc;
3227 }
3228 }
3229
3230 JvmtiSampledObjectAllocEventCollector::~JvmtiSampledObjectAllocEventCollector() {
3231 if (!_enable) {
3232 return;
3233 }
3234
3235 generate_call_for_allocated();
3236 unset_jvmti_thread_state();
3237
3238 // Unset the sampling collector as present in assertion mode only.
3239 assert(Thread::current()->is_Java_thread(),
3240 "Should always be in a Java thread");
3241 }
3242
3243 JvmtiGCMarker::JvmtiGCMarker() {
3244 // if there aren't any JVMTI environments then nothing to do
3245 if (!JvmtiEnv::environments_might_exist()) {
3246 return;
3247 }
3248
3249 if (JvmtiExport::should_post_garbage_collection_start()) {
3250 JvmtiExport::post_garbage_collection_start();
3251 }
3252
3253 if (SafepointSynchronize::is_at_safepoint()) {
3254 // Do clean up tasks that need to be done at a safepoint
3255 JvmtiEnvBase::check_for_periodic_clean_up();
3256 }
3257 }
3258
3259 JvmtiGCMarker::~JvmtiGCMarker() {
3260 // if there aren't any JVMTI environments then nothing to do
3261 if (!JvmtiEnv::environments_might_exist()) {
3262 return;
3263 }
3264
3265 // JVMTI notify gc finish
3266 if (JvmtiExport::should_post_garbage_collection_finish()) {
3267 JvmtiExport::post_garbage_collection_finish();
3268 }
3269 }