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