1 /*
2 * Copyright 2003-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 # include "incls/_precompiled.incl"
26 # include "incls/_jvmtiExport.cpp.incl"
27
28 #ifdef JVMTI_TRACE
29 #define EVT_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_SENT) != 0) { SafeResourceMark rm; tty->print_cr out; }
30 #define EVT_TRIG_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_TRIGGER) != 0) { SafeResourceMark rm; tty->print_cr out; }
31 #else
32 #define EVT_TRIG_TRACE(evt,out)
33 #define EVT_TRACE(evt,out)
34 #endif
35
36 ///////////////////////////////////////////////////////////////
37 //
38 // JvmtiEventTransition
39 //
40 // TO DO --
41 // more handle purging
42
43 // Use this for JavaThreads and state is _thread_in_vm.
44 class JvmtiJavaThreadEventTransition : StackObj {
45 private:
46 ResourceMark _rm;
47 ThreadToNativeFromVM _transition;
48 HandleMark _hm;
49
50 public:
51 JvmtiJavaThreadEventTransition(JavaThread *thread) :
52 _rm(),
53 _transition(thread),
54 _hm(thread) {};
55 };
56
57 // For JavaThreads which are not in _thread_in_vm state
58 // and other system threads use this.
59 class JvmtiThreadEventTransition : StackObj {
60 private:
61 ResourceMark _rm;
62 HandleMark _hm;
63 JavaThreadState _saved_state;
64 JavaThread *_jthread;
65
66 public:
67 JvmtiThreadEventTransition(Thread *thread) : _rm(), _hm() {
68 if (thread->is_Java_thread()) {
69 _jthread = (JavaThread *)thread;
70 _saved_state = _jthread->thread_state();
71 if (_saved_state == _thread_in_Java) {
72 ThreadStateTransition::transition_from_java(_jthread, _thread_in_native);
73 } else {
74 ThreadStateTransition::transition(_jthread, _saved_state, _thread_in_native);
75 }
76 } else {
77 _jthread = NULL;
78 }
79 }
80
81 ~JvmtiThreadEventTransition() {
82 if (_jthread != NULL)
83 ThreadStateTransition::transition_from_native(_jthread, _saved_state);
84 }
85 };
86
87
88 ///////////////////////////////////////////////////////////////
89 //
90 // JvmtiEventMark
91 //
92
93 class JvmtiEventMark : public StackObj {
94 private:
95 JavaThread *_thread;
96 JNIEnv* _jni_env;
97 bool _exception_detected;
98 bool _exception_caught;
99 #if 0
100 JNIHandleBlock* _hblock;
101 #endif
102
103 public:
104 JvmtiEventMark(JavaThread *thread) : _thread(thread),
105 _jni_env(thread->jni_environment()) {
106 #if 0
107 _hblock = thread->active_handles();
108 _hblock->clear_thoroughly(); // so we can be safe
109 #else
110 // we want to use the code above - but that needs the JNIHandle changes - later...
111 // for now, steal JNI push local frame code
112 JvmtiThreadState *state = thread->jvmti_thread_state();
113 // we are before an event.
114 // Save current jvmti thread exception state.
115 if (state != NULL) {
116 _exception_detected = state->is_exception_detected();
117 _exception_caught = state->is_exception_caught();
118 } else {
119 _exception_detected = false;
120 _exception_caught = false;
121 }
122
123 JNIHandleBlock* old_handles = thread->active_handles();
124 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
125 assert(new_handles != NULL, "should not be NULL");
126 new_handles->set_pop_frame_link(old_handles);
127 thread->set_active_handles(new_handles);
128 #endif
129 assert(thread == JavaThread::current(), "thread must be current!");
130 thread->frame_anchor()->make_walkable(thread);
131 };
132
133 ~JvmtiEventMark() {
134 #if 0
135 _hblock->clear(); // for consistency with future correct behavior
136 #else
137 // we want to use the code above - but that needs the JNIHandle changes - later...
138 // for now, steal JNI pop local frame code
139 JNIHandleBlock* old_handles = _thread->active_handles();
140 JNIHandleBlock* new_handles = old_handles->pop_frame_link();
141 assert(new_handles != NULL, "should not be NULL");
142 _thread->set_active_handles(new_handles);
143 // Note that we set the pop_frame_link to NULL explicitly, otherwise
144 // the release_block call will release the blocks.
145 old_handles->set_pop_frame_link(NULL);
146 JNIHandleBlock::release_block(old_handles, _thread); // may block
147 #endif
148
149 JvmtiThreadState* state = _thread->jvmti_thread_state();
150 // we are continuing after an event.
151 if (state != NULL) {
152 // Restore the jvmti thread exception state.
153 if (_exception_detected) {
154 state->set_exception_detected();
155 }
156 if (_exception_caught) {
157 state->set_exception_caught();
158 }
159 }
160 }
161
162 #if 0
163 jobject to_jobject(oop obj) { return obj == NULL? NULL : _hblock->allocate_handle_fast(obj); }
164 #else
165 // we want to use the code above - but that needs the JNIHandle changes - later...
166 // for now, use regular make_local
167 jobject to_jobject(oop obj) { return JNIHandles::make_local(_thread,obj); }
168 #endif
169
170 jclass to_jclass(klassOop klass) { return (klass == NULL ? NULL : (jclass)to_jobject(Klass::cast(klass)->java_mirror())); }
171
172 jmethodID to_jmethodID(methodHandle method) { return method->jmethod_id(); }
173
174 JNIEnv* jni_env() { return _jni_env; }
175 };
176
177 class JvmtiThreadEventMark : public JvmtiEventMark {
178 private:
179 jthread _jt;
180
181 public:
182 JvmtiThreadEventMark(JavaThread *thread) :
183 JvmtiEventMark(thread) {
184 _jt = (jthread)(to_jobject(thread->threadObj()));
185 };
186 jthread jni_thread() { return _jt; }
187 };
188
189 class JvmtiClassEventMark : public JvmtiThreadEventMark {
190 private:
191 jclass _jc;
192
193 public:
194 JvmtiClassEventMark(JavaThread *thread, klassOop klass) :
195 JvmtiThreadEventMark(thread) {
196 _jc = to_jclass(klass);
197 };
198 jclass jni_class() { return _jc; }
199 };
200
201 class JvmtiMethodEventMark : public JvmtiThreadEventMark {
202 private:
203 jmethodID _mid;
204
205 public:
206 JvmtiMethodEventMark(JavaThread *thread, methodHandle method) :
207 JvmtiThreadEventMark(thread),
208 _mid(to_jmethodID(method)) {};
209 jmethodID jni_methodID() { return _mid; }
210 };
211
212 class JvmtiLocationEventMark : public JvmtiMethodEventMark {
213 private:
214 jlocation _loc;
215
216 public:
217 JvmtiLocationEventMark(JavaThread *thread, methodHandle method, address location) :
218 JvmtiMethodEventMark(thread, method),
219 _loc(location - method->code_base()) {};
220 jlocation location() { return _loc; }
221 };
222
223 class JvmtiExceptionEventMark : public JvmtiLocationEventMark {
224 private:
225 jobject _exc;
226
227 public:
228 JvmtiExceptionEventMark(JavaThread *thread, methodHandle method, address location, Handle exception) :
229 JvmtiLocationEventMark(thread, method, location),
230 _exc(to_jobject(exception())) {};
231 jobject exception() { return _exc; }
232 };
233
234 class JvmtiClassFileLoadEventMark : public JvmtiThreadEventMark {
235 private:
236 const char *_class_name;
237 jobject _jloader;
238 jobject _protection_domain;
239 jclass _class_being_redefined;
240
241 public:
242 JvmtiClassFileLoadEventMark(JavaThread *thread, symbolHandle name,
243 Handle class_loader, Handle prot_domain, KlassHandle *class_being_redefined) : JvmtiThreadEventMark(thread) {
244 _class_name = name() != NULL? name->as_utf8() : NULL;
245 _jloader = (jobject)to_jobject(class_loader());
246 _protection_domain = (jobject)to_jobject(prot_domain());
247 if (class_being_redefined == NULL) {
248 _class_being_redefined = NULL;
249 } else {
250 _class_being_redefined = (jclass)to_jclass((*class_being_redefined)());
251 }
252 };
253 const char *class_name() {
254 return _class_name;
255 }
256 jobject jloader() {
257 return _jloader;
258 }
259 jobject protection_domain() {
260 return _protection_domain;
261 }
262 jclass class_being_redefined() {
263 return _class_being_redefined;
264 }
265 };
266
267 //////////////////////////////////////////////////////////////////////////////
268
269 int JvmtiExport::_field_access_count = 0;
270 int JvmtiExport::_field_modification_count = 0;
271
272 bool JvmtiExport::_can_access_local_variables = false;
273 bool JvmtiExport::_can_examine_or_deopt_anywhere = false;
274 bool JvmtiExport::_can_hotswap_or_post_breakpoint = false;
275 bool JvmtiExport::_can_modify_any_class = false;
276 bool JvmtiExport::_can_walk_any_space = false;
277
278 bool JvmtiExport::_has_redefined_a_class = false;
279 bool JvmtiExport::_all_dependencies_are_recorded = false;
280
281 //
282 // field access management
283 //
284
285 // interpreter generator needs the address of the counter
286 address JvmtiExport::get_field_access_count_addr() {
287 // We don't grab a lock because we don't want to
288 // serialize field access between all threads. This means that a
289 // thread on another processor can see the wrong count value and
290 // may either miss making a needed call into post_field_access()
291 // or will make an unneeded call into post_field_access(). We pay
292 // this price to avoid slowing down the VM when we aren't watching
293 // field accesses.
294 // Other access/mutation safe by virtue of being in VM state.
295 return (address)(&_field_access_count);
296 }
297
298 //
299 // field modification management
300 //
301
302 // interpreter generator needs the address of the counter
303 address JvmtiExport::get_field_modification_count_addr() {
304 // We don't grab a lock because we don't
305 // want to serialize field modification between all threads. This
306 // means that a thread on another processor can see the wrong
307 // count value and may either miss making a needed call into
308 // post_field_modification() or will make an unneeded call into
309 // post_field_modification(). We pay this price to avoid slowing
310 // down the VM when we aren't watching field modifications.
311 // Other access/mutation safe by virtue of being in VM state.
312 return (address)(&_field_modification_count);
313 }
314
315
316 ///////////////////////////////////////////////////////////////
317 // Functions needed by java.lang.instrument for starting up javaagent.
318 ///////////////////////////////////////////////////////////////
319
320 jint
321 JvmtiExport::get_jvmti_interface(JavaVM *jvm, void **penv, jint version) {
322 // The JVMTI_VERSION_INTERFACE_JVMTI part of the version number
323 // has already been validated in JNI GetEnv().
324 int major, minor, micro;
325
326 // micro version doesn't matter here (yet?)
327 decode_version_values(version, &major, &minor, µ);
328 switch (major) {
329 case 1:
330 switch (minor) {
331 case 0: // version 1.0.<micro> is recognized
332 case 1: // version 1.1.<micro> is recognized
333 break;
334
335 default:
336 return JNI_EVERSION; // unsupported minor version number
337 }
338 break;
339
340 default:
341 return JNI_EVERSION; // unsupported major version number
342 }
343
344 if (JvmtiEnv::get_phase() == JVMTI_PHASE_LIVE) {
345 JavaThread* current_thread = (JavaThread*) ThreadLocalStorage::thread();
346 // transition code: native to VM
347 ThreadInVMfromNative __tiv(current_thread);
348 __ENTRY(jvmtiEnv*, JvmtiExport::get_jvmti_interface, current_thread)
349 debug_only(VMNativeEntryWrapper __vew;)
350
351 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version);
352 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv*
353 return JNI_OK;
354
355 } else if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
356 // not live, no thread to transition
357 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version);
358 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv*
359 return JNI_OK;
360
361 } else {
362 // Called at the wrong time
363 *penv = NULL;
364 return JNI_EDETACHED;
365 }
366 }
367
368
369 void
370 JvmtiExport::decode_version_values(jint version, int * major, int * minor,
371 int * micro) {
372 *major = (version & JVMTI_VERSION_MASK_MAJOR) >> JVMTI_VERSION_SHIFT_MAJOR;
373 *minor = (version & JVMTI_VERSION_MASK_MINOR) >> JVMTI_VERSION_SHIFT_MINOR;
374 *micro = (version & JVMTI_VERSION_MASK_MICRO) >> JVMTI_VERSION_SHIFT_MICRO;
375 }
376
377 void JvmtiExport::enter_primordial_phase() {
378 JvmtiEnvBase::set_phase(JVMTI_PHASE_PRIMORDIAL);
379 }
380
381 void JvmtiExport::enter_start_phase() {
382 JvmtiManageCapabilities::recompute_always_capabilities();
383 JvmtiEnvBase::set_phase(JVMTI_PHASE_START);
384 }
385
386 void JvmtiExport::enter_onload_phase() {
387 JvmtiEnvBase::set_phase(JVMTI_PHASE_ONLOAD);
388 }
389
390 void JvmtiExport::enter_live_phase() {
391 JvmtiEnvBase::set_phase(JVMTI_PHASE_LIVE);
392 }
393
394 //
395 // JVMTI events that the VM posts to the debugger and also startup agent
396 // and call the agent's premain() for java.lang.instrument.
397 //
398
399 void JvmtiExport::post_vm_start() {
400 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("JVMTI Trg VM start event triggered" ));
401
402 // can now enable some events
403 JvmtiEventController::vm_start();
404
405 JvmtiEnvIterator it;
406 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
407 if (env->is_enabled(JVMTI_EVENT_VM_START)) {
408 EVT_TRACE(JVMTI_EVENT_VM_START, ("JVMTI Evt VM start event sent" ));
409
410 JavaThread *thread = JavaThread::current();
411 JvmtiThreadEventMark jem(thread);
412 JvmtiJavaThreadEventTransition jet(thread);
413 jvmtiEventVMStart callback = env->callbacks()->VMStart;
414 if (callback != NULL) {
415 (*callback)(env->jvmti_external(), jem.jni_env());
416 }
417 }
418 }
419 }
420
421
422 void JvmtiExport::post_vm_initialized() {
423 EVT_TRIG_TRACE(JVMTI_EVENT_VM_INIT, ("JVMTI Trg VM init event triggered" ));
424
425 // can now enable events
426 JvmtiEventController::vm_init();
427
428 JvmtiEnvIterator it;
429 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
430 if (env->is_enabled(JVMTI_EVENT_VM_INIT)) {
431 EVT_TRACE(JVMTI_EVENT_VM_INIT, ("JVMTI Evt VM init event sent" ));
432
433 JavaThread *thread = JavaThread::current();
434 JvmtiThreadEventMark jem(thread);
435 JvmtiJavaThreadEventTransition jet(thread);
436 jvmtiEventVMInit callback = env->callbacks()->VMInit;
437 if (callback != NULL) {
438 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
439 }
440 }
441 }
442 }
443
444
445 void JvmtiExport::post_vm_death() {
446 EVT_TRIG_TRACE(JVMTI_EVENT_VM_DEATH, ("JVMTI Trg VM death event triggered" ));
447
448 JvmtiEnvIterator it;
449 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
450 if (env->is_enabled(JVMTI_EVENT_VM_DEATH)) {
451 EVT_TRACE(JVMTI_EVENT_VM_DEATH, ("JVMTI Evt VM death event sent" ));
452
453 JavaThread *thread = JavaThread::current();
454 JvmtiEventMark jem(thread);
455 JvmtiJavaThreadEventTransition jet(thread);
456 jvmtiEventVMDeath callback = env->callbacks()->VMDeath;
457 if (callback != NULL) {
458 (*callback)(env->jvmti_external(), jem.jni_env());
459 }
460 }
461 }
462
463 JvmtiEnvBase::set_phase(JVMTI_PHASE_DEAD);
464 JvmtiEventController::vm_death();
465 }
466
467 char**
468 JvmtiExport::get_all_native_method_prefixes(int* count_ptr) {
469 // Have to grab JVMTI thread state lock to be sure environment doesn't
470 // go away while we iterate them. No locks during VM bring-up.
471 if (Threads::number_of_threads() == 0 || SafepointSynchronize::is_at_safepoint()) {
472 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
473 } else {
474 MutexLocker mu(JvmtiThreadState_lock);
475 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
476 }
477 }
478
479 class JvmtiClassFileLoadHookPoster : public StackObj {
480 private:
481 symbolHandle _h_name;
482 Handle _class_loader;
483 Handle _h_protection_domain;
484 unsigned char ** _data_ptr;
485 unsigned char ** _end_ptr;
486 JavaThread * _thread;
487 jint _curr_len;
488 unsigned char * _curr_data;
489 JvmtiEnv * _curr_env;
490 jint * _cached_length_ptr;
491 unsigned char ** _cached_data_ptr;
492 JvmtiThreadState * _state;
493 KlassHandle * _h_class_being_redefined;
494 JvmtiClassLoadKind _load_kind;
495
496 public:
497 inline JvmtiClassFileLoadHookPoster(symbolHandle h_name, Handle class_loader,
498 Handle h_protection_domain,
499 unsigned char **data_ptr, unsigned char **end_ptr,
500 unsigned char **cached_data_ptr,
501 jint *cached_length_ptr) {
502 _h_name = h_name;
503 _class_loader = class_loader;
504 _h_protection_domain = h_protection_domain;
505 _data_ptr = data_ptr;
506 _end_ptr = end_ptr;
507 _thread = JavaThread::current();
508 _curr_len = *end_ptr - *data_ptr;
509 _curr_data = *data_ptr;
510 _curr_env = NULL;
511 _cached_length_ptr = cached_length_ptr;
512 _cached_data_ptr = cached_data_ptr;
513 *_cached_length_ptr = 0;
514 *_cached_data_ptr = NULL;
515
516 _state = _thread->jvmti_thread_state();
517 if (_state != NULL) {
518 _h_class_being_redefined = _state->get_class_being_redefined();
519 _load_kind = _state->get_class_load_kind();
520 // Clear class_being_redefined flag here. The action
521 // from agent handler could generate a new class file load
522 // hook event and if it is not cleared the new event generated
523 // from regular class file load could have this stale redefined
524 // class handle info.
525 _state->clear_class_being_redefined();
526 } else {
527 // redefine and retransform will always set the thread state
528 _h_class_being_redefined = (KlassHandle *) NULL;
529 _load_kind = jvmti_class_load_kind_load;
530 }
531 }
532
533 void post() {
534 // EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK,
535 // ("JVMTI [%s] class file load hook event triggered",
536 // JvmtiTrace::safe_get_thread_name(_thread)));
537 post_all_envs();
538 copy_modified_data();
539 }
540
541 private:
542 void post_all_envs() {
543 if (_load_kind != jvmti_class_load_kind_retransform) {
544 // for class load and redefine,
545 // call the non-retransformable agents
546 JvmtiEnvIterator it;
547 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
548 if (!env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
549 // non-retransformable agents cannot retransform back,
550 // so no need to cache the original class file bytes
551 post_to_env(env, false);
552 }
553 }
554 }
555 JvmtiEnvIterator it;
556 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
557 // retransformable agents get all events
558 if (env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
559 // retransformable agents need to cache the original class file
560 // bytes if changes are made via the ClassFileLoadHook
561 post_to_env(env, true);
562 }
563 }
564 }
565
566 void post_to_env(JvmtiEnv* env, bool caching_needed) {
567 unsigned char *new_data = NULL;
568 jint new_len = 0;
569 // EVT_TRACE(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK,
570 // ("JVMTI [%s] class file load hook event sent %s data_ptr = %d, data_len = %d",
571 // JvmtiTrace::safe_get_thread_name(_thread),
572 // _h_name.is_null() ? "NULL" : _h_name->as_utf8(),
573 // _curr_data, _curr_len ));
574 JvmtiClassFileLoadEventMark jem(_thread, _h_name, _class_loader,
575 _h_protection_domain,
576 _h_class_being_redefined);
577 JvmtiJavaThreadEventTransition jet(_thread);
578 JNIEnv* jni_env = (JvmtiEnv::get_phase() == JVMTI_PHASE_PRIMORDIAL)?
579 NULL : jem.jni_env();
580 jvmtiEventClassFileLoadHook callback = env->callbacks()->ClassFileLoadHook;
581 if (callback != NULL) {
582 (*callback)(env->jvmti_external(), jni_env,
583 jem.class_being_redefined(),
584 jem.jloader(), jem.class_name(),
585 jem.protection_domain(),
586 _curr_len, _curr_data,
587 &new_len, &new_data);
588 }
589 if (new_data != NULL) {
590 // this agent has modified class data.
591 if (caching_needed && *_cached_data_ptr == NULL) {
592 // data has been changed by the new retransformable agent
593 // and it hasn't already been cached, cache it
594 *_cached_data_ptr = (unsigned char *)os::malloc(_curr_len);
595 memcpy(*_cached_data_ptr, _curr_data, _curr_len);
596 *_cached_length_ptr = _curr_len;
597 }
598
599 if (_curr_data != *_data_ptr) {
600 // curr_data is previous agent modified class data.
601 // And this has been changed by the new agent so
602 // we can delete it now.
603 _curr_env->Deallocate(_curr_data);
604 }
605
606 // Class file data has changed by the current agent.
607 _curr_data = new_data;
608 _curr_len = new_len;
609 // Save the current agent env we need this to deallocate the
610 // memory allocated by this agent.
611 _curr_env = env;
612 }
613 }
614
615 void copy_modified_data() {
616 // if one of the agent has modified class file data.
617 // Copy modified class data to new resources array.
618 if (_curr_data != *_data_ptr) {
619 *_data_ptr = NEW_RESOURCE_ARRAY(u1, _curr_len);
620 memcpy(*_data_ptr, _curr_data, _curr_len);
621 *_end_ptr = *_data_ptr + _curr_len;
622 _curr_env->Deallocate(_curr_data);
623 }
624 }
625 };
626
627 bool JvmtiExport::_should_post_class_file_load_hook = false;
628
629 // this entry is for class file load hook on class load, redefine and retransform
630 void JvmtiExport::post_class_file_load_hook(symbolHandle h_name,
631 Handle class_loader,
632 Handle h_protection_domain,
633 unsigned char **data_ptr,
634 unsigned char **end_ptr,
635 unsigned char **cached_data_ptr,
636 jint *cached_length_ptr) {
637 JvmtiClassFileLoadHookPoster poster(h_name, class_loader,
638 h_protection_domain,
639 data_ptr, end_ptr,
640 cached_data_ptr,
641 cached_length_ptr);
642 poster.post();
643 }
644
645 void JvmtiExport::report_unsupported(bool on) {
646 // If any JVMTI service is turned on, we need to exit before native code
647 // tries to access nonexistant services.
648 if (on) {
649 vm_exit_during_initialization("Java Kernel does not support JVMTI.");
650 }
651 }
652
653
654 #ifndef JVMTI_KERNEL
655 static inline klassOop oop_to_klassOop(oop obj) {
656 klassOop k = obj->klass();
657
658 // if the object is a java.lang.Class then return the java mirror
659 if (k == SystemDictionary::class_klass()) {
660 if (!java_lang_Class::is_primitive(obj)) {
661 k = java_lang_Class::as_klassOop(obj);
662 assert(k != NULL, "class for non-primitive mirror must exist");
663 }
664 }
665 return k;
666 }
667
668 class JvmtiVMObjectAllocEventMark : public JvmtiClassEventMark {
669 private:
670 jobject _jobj;
671 jlong _size;
672 public:
673 JvmtiVMObjectAllocEventMark(JavaThread *thread, oop obj) : JvmtiClassEventMark(thread, oop_to_klassOop(obj)) {
674 _jobj = (jobject)to_jobject(obj);
675 _size = obj->size() * wordSize;
676 };
677 jobject jni_jobject() { return _jobj; }
678 jlong size() { return _size; }
679 };
680
681 class JvmtiCompiledMethodLoadEventMark : public JvmtiMethodEventMark {
682 private:
683 jint _code_size;
684 const void *_code_data;
685 jint _map_length;
686 jvmtiAddrLocationMap *_map;
687 const void *_compile_info;
688 public:
689 JvmtiCompiledMethodLoadEventMark(JavaThread *thread, nmethod *nm)
690 : JvmtiMethodEventMark(thread,methodHandle(thread, nm->method())) {
691 _code_data = nm->code_begin();
692 _code_size = nm->code_size();
693 _compile_info = NULL; /* no info for our VM. */
694 JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nm, &_map, &_map_length);
695 }
696 ~JvmtiCompiledMethodLoadEventMark() {
697 FREE_C_HEAP_ARRAY(jvmtiAddrLocationMap, _map);
698 }
699
700 jint code_size() { return _code_size; }
701 const void *code_data() { return _code_data; }
702 jint map_length() { return _map_length; }
703 const jvmtiAddrLocationMap* map() { return _map; }
704 const void *compile_info() { return _compile_info; }
705 };
706
707
708
709 class JvmtiMonitorEventMark : public JvmtiThreadEventMark {
710 private:
711 jobject _jobj;
712 public:
713 JvmtiMonitorEventMark(JavaThread *thread, oop object)
714 : JvmtiThreadEventMark(thread){
715 _jobj = to_jobject(object);
716 }
717 jobject jni_object() { return _jobj; }
718 };
719
720 ///////////////////////////////////////////////////////////////
721 //
722 // pending CompiledMethodUnload support
723 //
724
725 bool JvmtiExport::_have_pending_compiled_method_unload_events;
726 GrowableArray<jmethodID>* JvmtiExport::_pending_compiled_method_unload_method_ids;
727 GrowableArray<const void *>* JvmtiExport::_pending_compiled_method_unload_code_begins;
728 JavaThread* JvmtiExport::_current_poster;
729
730 // post any pending CompiledMethodUnload events
731
732 void JvmtiExport::post_pending_compiled_method_unload_events() {
733 JavaThread* self = JavaThread::current();
734 assert(!self->owns_locks(), "can't hold locks");
735
736 // Indicates if this is the first activiation of this function.
737 // In theory the profiler's callback could call back into VM and provoke
738 // another CompiledMethodLoad event to be posted from this thread. As the
739 // stack rewinds we need to ensure that the original activation does the
740 // completion and notifies any waiters.
741 bool first_activation = false;
742
743 // the jmethodID (may not be valid) to be used for a single event
744 jmethodID method;
745 const void *code_begin;
746
747 // grab the monitor and check if another thread is already posting
748 // events. If there is another thread posting events then we wait
749 // until it completes. (In theory we could check the pending events to
750 // see if any of the addresses overlap with the event that we want to
751 // post but as it will happen so rarely we just block any thread waiting
752 // to post a CompiledMethodLoad or DynamicCodeGenerated event until all
753 // pending CompiledMethodUnload events have been posted).
754 //
755 // If another thread isn't posting we examine the list of pending jmethodIDs.
756 // If the list is empty then we are done. If it's not empty then this thread
757 // (self) becomes the pending event poster and we remove the top (last)
758 // event from the list. Note that this means we remove the newest event first
759 // but as they are all CompiledMethodUnload events the order doesn't matter.
760 // Once we have removed a jmethodID then we exit the monitor. Any other thread
761 // wanting to post a CompiledMethodLoad or DynamicCodeGenerated event will
762 // be forced to wait on the monitor.
763 {
764 MutexLocker mu(JvmtiPendingEvent_lock);
765 if (_current_poster != self) {
766 while (_current_poster != NULL) {
767 JvmtiPendingEvent_lock->wait();
768 }
769 }
770 if ((_pending_compiled_method_unload_method_ids == NULL) ||
771 (_pending_compiled_method_unload_method_ids->length() == 0)) {
772 return;
773 }
774 if (_current_poster == NULL) {
775 _current_poster = self;
776 first_activation = true;
777 } else {
778 // re-entrant
779 guarantee(_current_poster == self, "checking");
780 }
781 method = _pending_compiled_method_unload_method_ids->pop();
782 code_begin = _pending_compiled_method_unload_code_begins->pop();
783 }
784
785 // This thread is the pending event poster so it first posts the CompiledMethodUnload
786 // event for the jmethodID that has been removed from the list. Once posted it
787 // re-grabs the monitor and checks the list again. If the list is empty then and this
788 // is the first activation of the function then we reset the _have_pending_events
789 // flag, cleanup _current_poster to indicate that no thread is now servicing the
790 // pending events list, and finally notify any thread that might be waiting.
791 for (;;) {
792 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
793 ("JVMTI [%s] method compile unload event triggered",
794 JvmtiTrace::safe_get_thread_name(self)));
795
796 // post the event for each environment that has this event enabled.
797 JvmtiEnvIterator it;
798 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
799 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_UNLOAD)) {
800 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
801 ("JVMTI [%s] class compile method unload event sent jmethodID " PTR_FORMAT,
802 JvmtiTrace::safe_get_thread_name(self), method));
803
804 JvmtiEventMark jem(self);
805 JvmtiJavaThreadEventTransition jet(self);
806 jvmtiEventCompiledMethodUnload callback = env->callbacks()->CompiledMethodUnload;
807 if (callback != NULL) {
808 (*callback)(env->jvmti_external(), method, code_begin);
809 }
810 }
811 }
812
813 // event posted, now re-grab monitor and get the next event
814 // If there's no next event then we are done. If this is the first
815 // activiation of this function by this thread notify any waiters
816 // so that they can post.
817 {
818 MutexLocker ml(JvmtiPendingEvent_lock);
819 if (_pending_compiled_method_unload_method_ids->length() == 0) {
820 if (first_activation) {
821 _have_pending_compiled_method_unload_events = false;
822 _current_poster = NULL;
823 JvmtiPendingEvent_lock->notify_all();
824 }
825 return;
826 }
827 method = _pending_compiled_method_unload_method_ids->pop();
828 code_begin = _pending_compiled_method_unload_code_begins->pop();
829 }
830 }
831 }
832
833 ///////////////////////////////////////////////////////////////
834 //
835 // JvmtiExport
836 //
837
838 void JvmtiExport::post_raw_breakpoint(JavaThread *thread, methodOop method, address location) {
839 HandleMark hm(thread);
840 methodHandle mh(thread, method);
841
842 JvmtiThreadState *state = thread->jvmti_thread_state();
843 if (state == NULL) {
844 return;
845 }
846 EVT_TRIG_TRACE(JVMTI_EVENT_BREAKPOINT, ("JVMTI [%s] Trg Breakpoint triggered",
847 JvmtiTrace::safe_get_thread_name(thread)));
848 JvmtiEnvThreadStateIterator it(state);
849 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
850 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_BREAKPOINT);
851 if (!ets->breakpoint_posted() && ets->is_enabled(JVMTI_EVENT_BREAKPOINT)) {
852 ThreadState old_os_state = thread->osthread()->get_state();
853 thread->osthread()->set_state(BREAKPOINTED);
854 EVT_TRACE(JVMTI_EVENT_BREAKPOINT, ("JVMTI [%s] Evt Breakpoint sent %s.%s @ %d",
855 JvmtiTrace::safe_get_thread_name(thread),
856 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
857 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
858 location - mh()->code_base() ));
859
860 JvmtiEnv *env = ets->get_env();
861 JvmtiLocationEventMark jem(thread, mh, location);
862 JvmtiJavaThreadEventTransition jet(thread);
863 jvmtiEventBreakpoint callback = env->callbacks()->Breakpoint;
864 if (callback != NULL) {
865 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
866 jem.jni_methodID(), jem.location());
867 }
868
869 ets->set_breakpoint_posted();
870 thread->osthread()->set_state(old_os_state);
871 }
872 }
873 }
874
875 //////////////////////////////////////////////////////////////////////////////
876
877 bool JvmtiExport::_can_get_source_debug_extension = false;
878 bool JvmtiExport::_can_maintain_original_method_order = false;
879 bool JvmtiExport::_can_post_interpreter_events = false;
880 bool JvmtiExport::_can_post_exceptions = false;
881 bool JvmtiExport::_can_post_breakpoint = false;
882 bool JvmtiExport::_can_post_field_access = false;
883 bool JvmtiExport::_can_post_field_modification = false;
884 bool JvmtiExport::_can_post_method_entry = false;
885 bool JvmtiExport::_can_post_method_exit = false;
886 bool JvmtiExport::_can_pop_frame = false;
887 bool JvmtiExport::_can_force_early_return = false;
888
889 bool JvmtiExport::_should_post_single_step = false;
890 bool JvmtiExport::_should_post_field_access = false;
891 bool JvmtiExport::_should_post_field_modification = false;
892 bool JvmtiExport::_should_post_class_load = false;
893 bool JvmtiExport::_should_post_class_prepare = false;
894 bool JvmtiExport::_should_post_class_unload = false;
895 bool JvmtiExport::_should_post_thread_life = false;
896 bool JvmtiExport::_should_clean_up_heap_objects = false;
897 bool JvmtiExport::_should_post_native_method_bind = false;
898 bool JvmtiExport::_should_post_dynamic_code_generated = false;
899 bool JvmtiExport::_should_post_data_dump = false;
900 bool JvmtiExport::_should_post_compiled_method_load = false;
901 bool JvmtiExport::_should_post_compiled_method_unload = false;
902 bool JvmtiExport::_should_post_monitor_contended_enter = false;
903 bool JvmtiExport::_should_post_monitor_contended_entered = false;
904 bool JvmtiExport::_should_post_monitor_wait = false;
905 bool JvmtiExport::_should_post_monitor_waited = false;
906 bool JvmtiExport::_should_post_garbage_collection_start = false;
907 bool JvmtiExport::_should_post_garbage_collection_finish = false;
908 bool JvmtiExport::_should_post_object_free = false;
909 bool JvmtiExport::_should_post_resource_exhausted = false;
910 bool JvmtiExport::_should_post_vm_object_alloc = false;
911
912 ////////////////////////////////////////////////////////////////////////////////////////////////
913
914
915 //
916 // JVMTI single step management
917 //
918 void JvmtiExport::at_single_stepping_point(JavaThread *thread, methodOop method, address location) {
919 assert(JvmtiExport::should_post_single_step(), "must be single stepping");
920
921 HandleMark hm(thread);
922 methodHandle mh(thread, method);
923
924 // update information about current location and post a step event
925 JvmtiThreadState *state = thread->jvmti_thread_state();
926 if (state == NULL) {
927 return;
928 }
929 EVT_TRIG_TRACE(JVMTI_EVENT_SINGLE_STEP, ("JVMTI [%s] Trg Single Step triggered",
930 JvmtiTrace::safe_get_thread_name(thread)));
931 if (!state->hide_single_stepping()) {
932 if (state->is_pending_step_for_popframe()) {
933 state->process_pending_step_for_popframe();
934 }
935 if (state->is_pending_step_for_earlyret()) {
936 state->process_pending_step_for_earlyret();
937 }
938 JvmtiExport::post_single_step(thread, mh(), location);
939 }
940 }
941
942
943 void JvmtiExport::expose_single_stepping(JavaThread *thread) {
944 JvmtiThreadState *state = thread->jvmti_thread_state();
945 if (state != NULL) {
946 state->clear_hide_single_stepping();
947 }
948 }
949
950
951 bool JvmtiExport::hide_single_stepping(JavaThread *thread) {
952 JvmtiThreadState *state = thread->jvmti_thread_state();
953 if (state != NULL && state->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
954 state->set_hide_single_stepping();
955 return true;
956 } else {
957 return false;
958 }
959 }
960
961 void JvmtiExport::post_class_load(JavaThread *thread, klassOop klass) {
962 HandleMark hm(thread);
963 KlassHandle kh(thread, klass);
964
965 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_LOAD, ("JVMTI [%s] Trg Class Load triggered",
966 JvmtiTrace::safe_get_thread_name(thread)));
967 JvmtiThreadState* state = thread->jvmti_thread_state();
968 if (state == NULL) {
969 return;
970 }
971 JvmtiEnvThreadStateIterator it(state);
972 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
973 if (ets->is_enabled(JVMTI_EVENT_CLASS_LOAD)) {
974 EVT_TRACE(JVMTI_EVENT_CLASS_LOAD, ("JVMTI [%s] Evt Class Load sent %s",
975 JvmtiTrace::safe_get_thread_name(thread),
976 kh()==NULL? "NULL" : Klass::cast(kh())->external_name() ));
977
978 JvmtiEnv *env = ets->get_env();
979 JvmtiClassEventMark jem(thread, kh());
980 JvmtiJavaThreadEventTransition jet(thread);
981 jvmtiEventClassLoad callback = env->callbacks()->ClassLoad;
982 if (callback != NULL) {
983 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
984 }
985 }
986 }
987 }
988
989
990 void JvmtiExport::post_class_prepare(JavaThread *thread, klassOop klass) {
991 HandleMark hm(thread);
992 KlassHandle kh(thread, klass);
993
994 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("JVMTI [%s] Trg Class Prepare triggered",
995 JvmtiTrace::safe_get_thread_name(thread)));
996 JvmtiThreadState* state = thread->jvmti_thread_state();
997 if (state == NULL) {
998 return;
999 }
1000 JvmtiEnvThreadStateIterator it(state);
1001 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1002 if (ets->is_enabled(JVMTI_EVENT_CLASS_PREPARE)) {
1003 EVT_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("JVMTI [%s] Evt Class Prepare sent %s",
1004 JvmtiTrace::safe_get_thread_name(thread),
1005 kh()==NULL? "NULL" : Klass::cast(kh())->external_name() ));
1006
1007 JvmtiEnv *env = ets->get_env();
1008 JvmtiClassEventMark jem(thread, kh());
1009 JvmtiJavaThreadEventTransition jet(thread);
1010 jvmtiEventClassPrepare callback = env->callbacks()->ClassPrepare;
1011 if (callback != NULL) {
1012 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1013 }
1014 }
1015 }
1016 }
1017
1018 void JvmtiExport::post_class_unload(klassOop klass) {
1019 Thread *thread = Thread::current();
1020 HandleMark hm(thread);
1021 KlassHandle kh(thread, klass);
1022
1023 EVT_TRIG_TRACE(EXT_EVENT_CLASS_UNLOAD, ("JVMTI [?] Trg Class Unload triggered" ));
1024 if (JvmtiEventController::is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1025 assert(thread->is_VM_thread(), "wrong thread");
1026
1027 // get JavaThread for whom we are proxy
1028 JavaThread *real_thread =
1029 (JavaThread *)((VMThread *)thread)->vm_operation()->calling_thread();
1030
1031 JvmtiEnvIterator it;
1032 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1033 if (env->is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1034 EVT_TRACE(EXT_EVENT_CLASS_UNLOAD, ("JVMTI [?] Evt Class Unload sent %s",
1035 kh()==NULL? "NULL" : Klass::cast(kh())->external_name() ));
1036
1037 // do everything manually, since this is a proxy - needs special care
1038 JNIEnv* jni_env = real_thread->jni_environment();
1039 jthread jt = (jthread)JNIHandles::make_local(real_thread, real_thread->threadObj());
1040 jclass jk = (jclass)JNIHandles::make_local(real_thread, Klass::cast(kh())->java_mirror());
1041
1042 // Before we call the JVMTI agent, we have to set the state in the
1043 // thread for which we are proxying.
1044 JavaThreadState prev_state = real_thread->thread_state();
1045 assert(prev_state == _thread_blocked, "JavaThread should be at safepoint");
1046 real_thread->set_thread_state(_thread_in_native);
1047
1048 jvmtiExtensionEvent callback = env->ext_callbacks()->ClassUnload;
1049 if (callback != NULL) {
1050 (*callback)(env->jvmti_external(), jni_env, jt, jk);
1051 }
1052
1053 assert(real_thread->thread_state() == _thread_in_native,
1054 "JavaThread should be in native");
1055 real_thread->set_thread_state(prev_state);
1056
1057 JNIHandles::destroy_local(jk);
1058 JNIHandles::destroy_local(jt);
1059 }
1060 }
1061 }
1062 }
1063
1064
1065 void JvmtiExport::post_thread_start(JavaThread *thread) {
1066 assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
1067
1068 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_START, ("JVMTI [%s] Trg Thread Start event triggered",
1069 JvmtiTrace::safe_get_thread_name(thread)));
1070
1071 // do JVMTI thread initialization (if needed)
1072 JvmtiEventController::thread_started(thread);
1073
1074 // Do not post thread start event for hidden java thread.
1075 if (JvmtiEventController::is_enabled(JVMTI_EVENT_THREAD_START) &&
1076 !thread->is_hidden_from_external_view()) {
1077 JvmtiEnvIterator it;
1078 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1079 if (env->is_enabled(JVMTI_EVENT_THREAD_START)) {
1080 EVT_TRACE(JVMTI_EVENT_THREAD_START, ("JVMTI [%s] Evt Thread Start event sent",
1081 JvmtiTrace::safe_get_thread_name(thread) ));
1082
1083 JvmtiThreadEventMark jem(thread);
1084 JvmtiJavaThreadEventTransition jet(thread);
1085 jvmtiEventThreadStart callback = env->callbacks()->ThreadStart;
1086 if (callback != NULL) {
1087 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1088 }
1089 }
1090 }
1091 }
1092 }
1093
1094
1095 void JvmtiExport::post_thread_end(JavaThread *thread) {
1096 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_END, ("JVMTI [%s] Trg Thread End event triggered",
1097 JvmtiTrace::safe_get_thread_name(thread)));
1098
1099 JvmtiThreadState *state = thread->jvmti_thread_state();
1100 if (state == NULL) {
1101 return;
1102 }
1103
1104 // Do not post thread end event for hidden java thread.
1105 if (state->is_enabled(JVMTI_EVENT_THREAD_END) &&
1106 !thread->is_hidden_from_external_view()) {
1107
1108 JvmtiEnvThreadStateIterator it(state);
1109 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1110 if (ets->is_enabled(JVMTI_EVENT_THREAD_END)) {
1111 EVT_TRACE(JVMTI_EVENT_THREAD_END, ("JVMTI [%s] Evt Thread End event sent",
1112 JvmtiTrace::safe_get_thread_name(thread) ));
1113
1114 JvmtiEnv *env = ets->get_env();
1115 JvmtiThreadEventMark jem(thread);
1116 JvmtiJavaThreadEventTransition jet(thread);
1117 jvmtiEventThreadEnd callback = env->callbacks()->ThreadEnd;
1118 if (callback != NULL) {
1119 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1120 }
1121 }
1122 }
1123 }
1124 }
1125
1126 void JvmtiExport::post_object_free(JvmtiEnv* env, jlong tag) {
1127 assert(SafepointSynchronize::is_at_safepoint(), "must be executed at safepoint");
1128 assert(env->is_enabled(JVMTI_EVENT_OBJECT_FREE), "checking");
1129
1130 EVT_TRIG_TRACE(JVMTI_EVENT_OBJECT_FREE, ("JVMTI [?] Trg Object Free triggered" ));
1131 EVT_TRACE(JVMTI_EVENT_OBJECT_FREE, ("JVMTI [?] Evt Object Free sent"));
1132
1133 jvmtiEventObjectFree callback = env->callbacks()->ObjectFree;
1134 if (callback != NULL) {
1135 (*callback)(env->jvmti_external(), tag);
1136 }
1137 }
1138
1139 void JvmtiExport::post_resource_exhausted(jint resource_exhausted_flags, const char* description) {
1140 EVT_TRIG_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("JVMTI Trg resource exhausted event triggered" ));
1141
1142 JvmtiEnvIterator it;
1143 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1144 if (env->is_enabled(JVMTI_EVENT_RESOURCE_EXHAUSTED)) {
1145 EVT_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("JVMTI Evt resource exhausted event sent" ));
1146
1147 JavaThread *thread = JavaThread::current();
1148 JvmtiThreadEventMark jem(thread);
1149 JvmtiJavaThreadEventTransition jet(thread);
1150 jvmtiEventResourceExhausted callback = env->callbacks()->ResourceExhausted;
1151 if (callback != NULL) {
1152 (*callback)(env->jvmti_external(), jem.jni_env(),
1153 resource_exhausted_flags, NULL, description);
1154 }
1155 }
1156 }
1157 }
1158
1159 void JvmtiExport::post_method_entry(JavaThread *thread, methodOop method, frame current_frame) {
1160 HandleMark hm(thread);
1161 methodHandle mh(thread, method);
1162
1163 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("JVMTI [%s] Trg Method Entry triggered %s.%s",
1164 JvmtiTrace::safe_get_thread_name(thread),
1165 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1166 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1167
1168 JvmtiThreadState* state = thread->jvmti_thread_state();
1169 if (state == NULL || !state->is_interp_only_mode()) {
1170 // for any thread that actually wants method entry, interp_only_mode is set
1171 return;
1172 }
1173
1174 state->incr_cur_stack_depth();
1175
1176 if (state->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1177 JvmtiEnvThreadStateIterator it(state);
1178 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1179 if (ets->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1180 EVT_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("JVMTI [%s] Evt Method Entry sent %s.%s",
1181 JvmtiTrace::safe_get_thread_name(thread),
1182 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1183 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1184
1185 JvmtiEnv *env = ets->get_env();
1186 JvmtiMethodEventMark jem(thread, mh);
1187 JvmtiJavaThreadEventTransition jet(thread);
1188 jvmtiEventMethodEntry callback = env->callbacks()->MethodEntry;
1189 if (callback != NULL) {
1190 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_methodID());
1191 }
1192 }
1193 }
1194 }
1195 }
1196
1197 void JvmtiExport::post_method_exit(JavaThread *thread, methodOop method, frame current_frame) {
1198 HandleMark hm(thread);
1199 methodHandle mh(thread, method);
1200
1201 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_EXIT, ("JVMTI [%s] Trg Method Exit triggered %s.%s",
1202 JvmtiTrace::safe_get_thread_name(thread),
1203 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1204 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1205
1206 JvmtiThreadState *state = thread->jvmti_thread_state();
1207 if (state == NULL || !state->is_interp_only_mode()) {
1208 // for any thread that actually wants method exit, interp_only_mode is set
1209 return;
1210 }
1211
1212 // return a flag when a method terminates by throwing an exception
1213 // i.e. if an exception is thrown and it's not caught by the current method
1214 bool exception_exit = state->is_exception_detected() && !state->is_exception_caught();
1215
1216
1217 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1218 Handle result;
1219 jvalue value;
1220 value.j = 0L;
1221
1222 // if the method hasn't been popped because of an exception then we populate
1223 // the return_value parameter for the callback. At this point we only have
1224 // the address of a "raw result" and we just call into the interpreter to
1225 // convert this into a jvalue.
1226 if (!exception_exit) {
1227 oop oop_result;
1228 BasicType type = current_frame.interpreter_frame_result(&oop_result, &value);
1229 if (type == T_OBJECT || type == T_ARRAY) {
1230 result = Handle(thread, oop_result);
1231 }
1232 }
1233
1234 JvmtiEnvThreadStateIterator it(state);
1235 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1236 if (ets->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1237 EVT_TRACE(JVMTI_EVENT_METHOD_EXIT, ("JVMTI [%s] Evt Method Exit sent %s.%s",
1238 JvmtiTrace::safe_get_thread_name(thread),
1239 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1240 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1241
1242 JvmtiEnv *env = ets->get_env();
1243 JvmtiMethodEventMark jem(thread, mh);
1244 if (result.not_null()) {
1245 value.l = JNIHandles::make_local(thread, result());
1246 }
1247 JvmtiJavaThreadEventTransition jet(thread);
1248 jvmtiEventMethodExit callback = env->callbacks()->MethodExit;
1249 if (callback != NULL) {
1250 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1251 jem.jni_methodID(), exception_exit, value);
1252 }
1253 }
1254 }
1255 }
1256
1257 if (state->is_enabled(JVMTI_EVENT_FRAME_POP)) {
1258 JvmtiEnvThreadStateIterator it(state);
1259 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1260 int cur_frame_number = state->cur_stack_depth();
1261
1262 if (ets->is_frame_pop(cur_frame_number)) {
1263 // we have a NotifyFramePop entry for this frame.
1264 // now check that this env/thread wants this event
1265 if (ets->is_enabled(JVMTI_EVENT_FRAME_POP)) {
1266 EVT_TRACE(JVMTI_EVENT_FRAME_POP, ("JVMTI [%s] Evt Frame Pop sent %s.%s",
1267 JvmtiTrace::safe_get_thread_name(thread),
1268 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1269 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1270
1271 // we also need to issue a frame pop event for this frame
1272 JvmtiEnv *env = ets->get_env();
1273 JvmtiMethodEventMark jem(thread, mh);
1274 JvmtiJavaThreadEventTransition jet(thread);
1275 jvmtiEventFramePop callback = env->callbacks()->FramePop;
1276 if (callback != NULL) {
1277 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1278 jem.jni_methodID(), exception_exit);
1279 }
1280 }
1281 // remove the frame's entry
1282 ets->clear_frame_pop(cur_frame_number);
1283 }
1284 }
1285 }
1286
1287 state->decr_cur_stack_depth();
1288 }
1289
1290
1291 // Todo: inline this for optimization
1292 void JvmtiExport::post_single_step(JavaThread *thread, methodOop method, address location) {
1293 HandleMark hm(thread);
1294 methodHandle mh(thread, method);
1295
1296 JvmtiThreadState *state = thread->jvmti_thread_state();
1297 if (state == NULL) {
1298 return;
1299 }
1300 JvmtiEnvThreadStateIterator it(state);
1301 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1302 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_SINGLE_STEP);
1303 if (!ets->single_stepping_posted() && ets->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1304 EVT_TRACE(JVMTI_EVENT_SINGLE_STEP, ("JVMTI [%s] Evt Single Step sent %s.%s @ %d",
1305 JvmtiTrace::safe_get_thread_name(thread),
1306 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1307 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1308 location - mh()->code_base() ));
1309
1310 JvmtiEnv *env = ets->get_env();
1311 JvmtiLocationEventMark jem(thread, mh, location);
1312 JvmtiJavaThreadEventTransition jet(thread);
1313 jvmtiEventSingleStep callback = env->callbacks()->SingleStep;
1314 if (callback != NULL) {
1315 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1316 jem.jni_methodID(), jem.location());
1317 }
1318
1319 ets->set_single_stepping_posted();
1320 }
1321 }
1322 }
1323
1324
1325 void JvmtiExport::post_exception_throw(JavaThread *thread, methodOop method, address location, oop exception) {
1326 HandleMark hm(thread);
1327 methodHandle mh(thread, method);
1328 Handle exception_handle(thread, exception);
1329
1330 JvmtiThreadState *state = thread->jvmti_thread_state();
1331 if (state == NULL) {
1332 return;
1333 }
1334
1335 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION, ("JVMTI [%s] Trg Exception thrown triggered",
1336 JvmtiTrace::safe_get_thread_name(thread)));
1337 if (!state->is_exception_detected()) {
1338 state->set_exception_detected();
1339 JvmtiEnvThreadStateIterator it(state);
1340 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1341 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION) && (exception != NULL)) {
1342
1343 EVT_TRACE(JVMTI_EVENT_EXCEPTION,
1344 ("JVMTI [%s] Evt Exception thrown sent %s.%s @ %d",
1345 JvmtiTrace::safe_get_thread_name(thread),
1346 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1347 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1348 location - mh()->code_base() ));
1349
1350 JvmtiEnv *env = ets->get_env();
1351 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
1352
1353 // It's okay to clear these exceptions here because we duplicate
1354 // this lookup in InterpreterRuntime::exception_handler_for_exception.
1355 EXCEPTION_MARK;
1356
1357 bool should_repeat;
1358 vframeStream st(thread);
1359 assert(!st.at_end(), "cannot be at end");
1360 methodOop current_method = NULL;
1361 int current_bci = -1;
1362 do {
1363 current_method = st.method();
1364 current_bci = st.bci();
1365 do {
1366 should_repeat = false;
1367 KlassHandle eh_klass(thread, exception_handle()->klass());
1368 current_bci = current_method->fast_exception_handler_bci_for(
1369 eh_klass, current_bci, THREAD);
1370 if (HAS_PENDING_EXCEPTION) {
1371 exception_handle = KlassHandle(thread, PENDING_EXCEPTION);
1372 CLEAR_PENDING_EXCEPTION;
1373 should_repeat = true;
1374 }
1375 } while (should_repeat && (current_bci != -1));
1376 st.next();
1377 } while ((current_bci < 0) && (!st.at_end()));
1378
1379 jmethodID catch_jmethodID;
1380 if (current_bci < 0) {
1381 catch_jmethodID = 0;
1382 current_bci = 0;
1383 } else {
1384 catch_jmethodID = jem.to_jmethodID(
1385 methodHandle(thread, current_method));
1386 }
1387
1388 JvmtiJavaThreadEventTransition jet(thread);
1389 jvmtiEventException callback = env->callbacks()->Exception;
1390 if (callback != NULL) {
1391 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1392 jem.jni_methodID(), jem.location(),
1393 jem.exception(),
1394 catch_jmethodID, current_bci);
1395 }
1396 }
1397 }
1398 }
1399
1400 // frames may get popped because of this throw, be safe - invalidate cached depth
1401 state->invalidate_cur_stack_depth();
1402 }
1403
1404
1405 void JvmtiExport::notice_unwind_due_to_exception(JavaThread *thread, methodOop method, address location, oop exception, bool in_handler_frame) {
1406 HandleMark hm(thread);
1407 methodHandle mh(thread, method);
1408 Handle exception_handle(thread, exception);
1409
1410 JvmtiThreadState *state = thread->jvmti_thread_state();
1411 if (state == NULL) {
1412 return;
1413 }
1414 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
1415 ("JVMTI [%s] Trg unwind_due_to_exception triggered %s.%s @ %s%d - %s",
1416 JvmtiTrace::safe_get_thread_name(thread),
1417 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1418 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1419 location==0? "no location:" : "",
1420 location==0? 0 : location - mh()->code_base(),
1421 in_handler_frame? "in handler frame" : "not handler frame" ));
1422
1423 if (state->is_exception_detected()) {
1424
1425 state->invalidate_cur_stack_depth();
1426 if (!in_handler_frame) {
1427 // Not in exception handler.
1428 if(state->is_interp_only_mode()) {
1429 // method exit and frame pop events are posted only in interp mode.
1430 // When these events are enabled code should be in running in interp mode.
1431 JvmtiExport::post_method_exit(thread, method, thread->last_frame());
1432 // The cached cur_stack_depth might have changed from the
1433 // operations of frame pop or method exit. We are not 100% sure
1434 // the cached cur_stack_depth is still valid depth so invalidate
1435 // it.
1436 state->invalidate_cur_stack_depth();
1437 }
1438 } else {
1439 // In exception handler frame. Report exception catch.
1440 assert(location != NULL, "must be a known location");
1441 // Update cur_stack_depth - the frames above the current frame
1442 // have been unwound due to this exception:
1443 assert(!state->is_exception_caught(), "exception must not be caught yet.");
1444 state->set_exception_caught();
1445
1446 JvmtiEnvThreadStateIterator it(state);
1447 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1448 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION_CATCH) && (exception_handle() != NULL)) {
1449 EVT_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
1450 ("JVMTI [%s] Evt ExceptionCatch sent %s.%s @ %d",
1451 JvmtiTrace::safe_get_thread_name(thread),
1452 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1453 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1454 location - mh()->code_base() ));
1455
1456 JvmtiEnv *env = ets->get_env();
1457 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
1458 JvmtiJavaThreadEventTransition jet(thread);
1459 jvmtiEventExceptionCatch callback = env->callbacks()->ExceptionCatch;
1460 if (callback != NULL) {
1461 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1462 jem.jni_methodID(), jem.location(),
1463 jem.exception());
1464 }
1465 }
1466 }
1467 }
1468 }
1469 }
1470
1471 oop JvmtiExport::jni_GetField_probe(JavaThread *thread, jobject jobj, oop obj,
1472 klassOop klass, jfieldID fieldID, bool is_static) {
1473 if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) {
1474 // At least one field access watch is set so we have more work
1475 // to do. This wrapper is used by entry points that allow us
1476 // to create handles in post_field_access_by_jni().
1477 post_field_access_by_jni(thread, obj, klass, fieldID, is_static);
1478 // event posting can block so refetch oop if we were passed a jobj
1479 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
1480 }
1481 return obj;
1482 }
1483
1484 oop JvmtiExport::jni_GetField_probe_nh(JavaThread *thread, jobject jobj, oop obj,
1485 klassOop klass, jfieldID fieldID, bool is_static) {
1486 if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) {
1487 // At least one field access watch is set so we have more work
1488 // to do. This wrapper is used by "quick" entry points that don't
1489 // allow us to create handles in post_field_access_by_jni(). We
1490 // override that with a ResetNoHandleMark.
1491 ResetNoHandleMark rnhm;
1492 post_field_access_by_jni(thread, obj, klass, fieldID, is_static);
1493 // event posting can block so refetch oop if we were passed a jobj
1494 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
1495 }
1496 return obj;
1497 }
1498
1499 void JvmtiExport::post_field_access_by_jni(JavaThread *thread, oop obj,
1500 klassOop klass, jfieldID fieldID, bool is_static) {
1501 // We must be called with a Java context in order to provide reasonable
1502 // values for the klazz, method, and location fields. The callers of this
1503 // function don't make the call unless there is a Java context.
1504 assert(thread->has_last_Java_frame(), "must be called with a Java context");
1505
1506 ResourceMark rm;
1507 fieldDescriptor fd;
1508 // if get_field_descriptor finds fieldID to be invalid, then we just bail
1509 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
1510 assert(valid_fieldID == true,"post_field_access_by_jni called with invalid fieldID");
1511 if (!valid_fieldID) return;
1512 // field accesses are not watched so bail
1513 if (!fd.is_field_access_watched()) return;
1514
1515 HandleMark hm(thread);
1516 KlassHandle h_klass(thread, klass);
1517 Handle h_obj;
1518 if (!is_static) {
1519 // non-static field accessors have an object, but we need a handle
1520 assert(obj != NULL, "non-static needs an object");
1521 h_obj = Handle(thread, obj);
1522 }
1523 post_field_access(thread,
1524 thread->last_frame().interpreter_frame_method(),
1525 thread->last_frame().interpreter_frame_bcp(),
1526 h_klass, h_obj, fieldID);
1527 }
1528
1529 void JvmtiExport::post_field_access(JavaThread *thread, methodOop method,
1530 address location, KlassHandle field_klass, Handle object, jfieldID field) {
1531
1532 HandleMark hm(thread);
1533 methodHandle mh(thread, method);
1534
1535 JvmtiThreadState *state = thread->jvmti_thread_state();
1536 if (state == NULL) {
1537 return;
1538 }
1539 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("JVMTI [%s] Trg Field Access event triggered",
1540 JvmtiTrace::safe_get_thread_name(thread)));
1541 JvmtiEnvThreadStateIterator it(state);
1542 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1543 if (ets->is_enabled(JVMTI_EVENT_FIELD_ACCESS)) {
1544 EVT_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("JVMTI [%s] Evt Field Access event sent %s.%s @ %d",
1545 JvmtiTrace::safe_get_thread_name(thread),
1546 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1547 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1548 location - mh()->code_base() ));
1549
1550 JvmtiEnv *env = ets->get_env();
1551 JvmtiLocationEventMark jem(thread, mh, location);
1552 jclass field_jclass = jem.to_jclass(field_klass());
1553 jobject field_jobject = jem.to_jobject(object());
1554 JvmtiJavaThreadEventTransition jet(thread);
1555 jvmtiEventFieldAccess callback = env->callbacks()->FieldAccess;
1556 if (callback != NULL) {
1557 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1558 jem.jni_methodID(), jem.location(),
1559 field_jclass, field_jobject, field);
1560 }
1561 }
1562 }
1563 }
1564
1565 oop JvmtiExport::jni_SetField_probe(JavaThread *thread, jobject jobj, oop obj,
1566 klassOop klass, jfieldID fieldID, bool is_static,
1567 char sig_type, jvalue *value) {
1568 if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) {
1569 // At least one field modification watch is set so we have more work
1570 // to do. This wrapper is used by entry points that allow us
1571 // to create handles in post_field_modification_by_jni().
1572 post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value);
1573 // event posting can block so refetch oop if we were passed a jobj
1574 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
1575 }
1576 return obj;
1577 }
1578
1579 oop JvmtiExport::jni_SetField_probe_nh(JavaThread *thread, jobject jobj, oop obj,
1580 klassOop klass, jfieldID fieldID, bool is_static,
1581 char sig_type, jvalue *value) {
1582 if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) {
1583 // At least one field modification watch is set so we have more work
1584 // to do. This wrapper is used by "quick" entry points that don't
1585 // allow us to create handles in post_field_modification_by_jni(). We
1586 // override that with a ResetNoHandleMark.
1587 ResetNoHandleMark rnhm;
1588 post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value);
1589 // event posting can block so refetch oop if we were passed a jobj
1590 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
1591 }
1592 return obj;
1593 }
1594
1595 void JvmtiExport::post_field_modification_by_jni(JavaThread *thread, oop obj,
1596 klassOop klass, jfieldID fieldID, bool is_static,
1597 char sig_type, jvalue *value) {
1598 // We must be called with a Java context in order to provide reasonable
1599 // values for the klazz, method, and location fields. The callers of this
1600 // function don't make the call unless there is a Java context.
1601 assert(thread->has_last_Java_frame(), "must be called with Java context");
1602
1603 ResourceMark rm;
1604 fieldDescriptor fd;
1605 // if get_field_descriptor finds fieldID to be invalid, then we just bail
1606 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
1607 assert(valid_fieldID == true,"post_field_modification_by_jni called with invalid fieldID");
1608 if (!valid_fieldID) return;
1609 // field modifications are not watched so bail
1610 if (!fd.is_field_modification_watched()) return;
1611
1612 HandleMark hm(thread);
1613
1614 Handle h_obj;
1615 if (!is_static) {
1616 // non-static field accessors have an object, but we need a handle
1617 assert(obj != NULL, "non-static needs an object");
1618 h_obj = Handle(thread, obj);
1619 }
1620 KlassHandle h_klass(thread, klass);
1621 post_field_modification(thread,
1622 thread->last_frame().interpreter_frame_method(),
1623 thread->last_frame().interpreter_frame_bcp(),
1624 h_klass, h_obj, fieldID, sig_type, value);
1625 }
1626
1627 void JvmtiExport::post_raw_field_modification(JavaThread *thread, methodOop method,
1628 address location, KlassHandle field_klass, Handle object, jfieldID field,
1629 char sig_type, jvalue *value) {
1630
1631 if (sig_type == 'I' || sig_type == 'Z' || sig_type == 'C' || sig_type == 'S') {
1632 // 'I' instructions are used for byte, char, short and int.
1633 // determine which it really is, and convert
1634 fieldDescriptor fd;
1635 bool found = JvmtiEnv::get_field_descriptor(field_klass(), field, &fd);
1636 // should be found (if not, leave as is)
1637 if (found) {
1638 jint ival = value->i;
1639 // convert value from int to appropriate type
1640 switch (fd.field_type()) {
1641 case T_BOOLEAN:
1642 sig_type = 'Z';
1643 value->i = 0; // clear it
1644 value->z = (jboolean)ival;
1645 break;
1646 case T_BYTE:
1647 sig_type = 'B';
1648 value->i = 0; // clear it
1649 value->b = (jbyte)ival;
1650 break;
1651 case T_CHAR:
1652 sig_type = 'C';
1653 value->i = 0; // clear it
1654 value->c = (jchar)ival;
1655 break;
1656 case T_SHORT:
1657 sig_type = 'S';
1658 value->i = 0; // clear it
1659 value->s = (jshort)ival;
1660 break;
1661 case T_INT:
1662 // nothing to do
1663 break;
1664 default:
1665 // this is an integer instruction, should be one of above
1666 ShouldNotReachHere();
1667 break;
1668 }
1669 }
1670 }
1671
1672 // convert oop to JNI handle.
1673 if (sig_type == 'L' || sig_type == '[') {
1674 value->l = (jobject)JNIHandles::make_local(thread, (oop)value->l);
1675 }
1676
1677 post_field_modification(thread, method, location, field_klass, object, field, sig_type, value);
1678
1679 // Destroy the JNI handle allocated above.
1680 if (sig_type == 'L') {
1681 JNIHandles::destroy_local(value->l);
1682 }
1683 }
1684
1685 void JvmtiExport::post_field_modification(JavaThread *thread, methodOop method,
1686 address location, KlassHandle field_klass, Handle object, jfieldID field,
1687 char sig_type, jvalue *value_ptr) {
1688
1689 HandleMark hm(thread);
1690 methodHandle mh(thread, method);
1691
1692 JvmtiThreadState *state = thread->jvmti_thread_state();
1693 if (state == NULL) {
1694 return;
1695 }
1696 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
1697 ("JVMTI [%s] Trg Field Modification event triggered",
1698 JvmtiTrace::safe_get_thread_name(thread)));
1699
1700 JvmtiEnvThreadStateIterator it(state);
1701 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1702 if (ets->is_enabled(JVMTI_EVENT_FIELD_MODIFICATION)) {
1703 EVT_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
1704 ("JVMTI [%s] Evt Field Modification event sent %s.%s @ %d",
1705 JvmtiTrace::safe_get_thread_name(thread),
1706 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1707 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1708 location - mh()->code_base() ));
1709
1710 JvmtiEnv *env = ets->get_env();
1711 JvmtiLocationEventMark jem(thread, mh, location);
1712 jclass field_jclass = jem.to_jclass(field_klass());
1713 jobject field_jobject = jem.to_jobject(object());
1714 JvmtiJavaThreadEventTransition jet(thread);
1715 jvmtiEventFieldModification callback = env->callbacks()->FieldModification;
1716 if (callback != NULL) {
1717 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1718 jem.jni_methodID(), jem.location(),
1719 field_jclass, field_jobject, field, sig_type, *value_ptr);
1720 }
1721 }
1722 }
1723 }
1724
1725 void JvmtiExport::post_native_method_bind(methodOop method, address* function_ptr) {
1726 JavaThread* thread = JavaThread::current();
1727 assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
1728
1729 HandleMark hm(thread);
1730 methodHandle mh(thread, method);
1731
1732 EVT_TRIG_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("JVMTI [%s] Trg Native Method Bind event triggered",
1733 JvmtiTrace::safe_get_thread_name(thread)));
1734
1735 if (JvmtiEventController::is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
1736 JvmtiEnvIterator it;
1737 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1738 if (env->is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
1739 EVT_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("JVMTI [%s] Evt Native Method Bind event sent",
1740 JvmtiTrace::safe_get_thread_name(thread) ));
1741
1742 JvmtiMethodEventMark jem(thread, mh);
1743 JvmtiJavaThreadEventTransition jet(thread);
1744 JNIEnv* jni_env = JvmtiEnv::get_phase() == JVMTI_PHASE_PRIMORDIAL? NULL : jem.jni_env();
1745 jvmtiEventNativeMethodBind callback = env->callbacks()->NativeMethodBind;
1746 if (callback != NULL) {
1747 (*callback)(env->jvmti_external(), jni_env, jem.jni_thread(),
1748 jem.jni_methodID(), (void*)(*function_ptr), (void**)function_ptr);
1749 }
1750 }
1751 }
1752 }
1753 }
1754
1755
1756 void JvmtiExport::post_compiled_method_load(nmethod *nm) {
1757 // If there are pending CompiledMethodUnload events then these are
1758 // posted before this CompiledMethodLoad event. We "lock" the nmethod and
1759 // maintain a handle to the methodOop to ensure that the nmethod isn't
1760 // flushed or unloaded while posting the events.
1761 JavaThread* thread = JavaThread::current();
1762 if (have_pending_compiled_method_unload_events()) {
1763 methodHandle mh(thread, nm->method());
1764 nmethodLocker nml(nm);
1765 post_pending_compiled_method_unload_events();
1766 }
1767
1768 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
1769 ("JVMTI [%s] method compile load event triggered",
1770 JvmtiTrace::safe_get_thread_name(thread)));
1771
1772 JvmtiEnvIterator it;
1773 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1774 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) {
1775
1776 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
1777 ("JVMTI [%s] class compile method load event sent %s.%s ",
1778 JvmtiTrace::safe_get_thread_name(thread),
1779 (nm->method() == NULL) ? "NULL" : nm->method()->klass_name()->as_C_string(),
1780 (nm->method() == NULL) ? "NULL" : nm->method()->name()->as_C_string()));
1781
1782 ResourceMark rm(thread);
1783 JvmtiCompiledMethodLoadEventMark jem(thread, nm);
1784 JvmtiJavaThreadEventTransition jet(thread);
1785 jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad;
1786 if (callback != NULL) {
1787 (*callback)(env->jvmti_external(), jem.jni_methodID(),
1788 jem.code_size(), jem.code_data(), jem.map_length(),
1789 jem.map(), jem.compile_info());
1790 }
1791 }
1792 }
1793 }
1794
1795
1796 // post a COMPILED_METHOD_LOAD event for a given environment
1797 void JvmtiExport::post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length,
1798 const void *code_begin, const jint map_length,
1799 const jvmtiAddrLocationMap* map)
1800 {
1801 JavaThread* thread = JavaThread::current();
1802 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
1803 ("JVMTI [%s] method compile load event triggered (by GenerateEvents)",
1804 JvmtiTrace::safe_get_thread_name(thread)));
1805 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) {
1806
1807 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
1808 ("JVMTI [%s] class compile method load event sent (by GenerateEvents), jmethodID=" PTR_FORMAT,
1809 JvmtiTrace::safe_get_thread_name(thread), method));
1810
1811 JvmtiEventMark jem(thread);
1812 JvmtiJavaThreadEventTransition jet(thread);
1813 jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad;
1814 if (callback != NULL) {
1815 (*callback)(env->jvmti_external(), method,
1816 length, code_begin, map_length,
1817 map, NULL);
1818 }
1819 }
1820 }
1821
1822 // used at a safepoint to post a CompiledMethodUnload event
1823 void JvmtiExport::post_compiled_method_unload_at_safepoint(jmethodID mid, const void *code_begin) {
1824 assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint");
1825
1826 // create list lazily
1827 if (_pending_compiled_method_unload_method_ids == NULL) {
1828 _pending_compiled_method_unload_method_ids = new (ResourceObj::C_HEAP) GrowableArray<jmethodID>(10,true);
1829 _pending_compiled_method_unload_code_begins = new (ResourceObj::C_HEAP) GrowableArray<const void *>(10,true);
1830 }
1831 _pending_compiled_method_unload_method_ids->append(mid);
1832 _pending_compiled_method_unload_code_begins->append(code_begin);
1833 _have_pending_compiled_method_unload_events = true;
1834 }
1835
1836 void JvmtiExport::post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) {
1837 JavaThread* thread = JavaThread::current();
1838 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
1839 ("JVMTI [%s] method dynamic code generated event triggered",
1840 JvmtiTrace::safe_get_thread_name(thread)));
1841 JvmtiEnvIterator it;
1842 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1843 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
1844 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
1845 ("JVMTI [%s] dynamic code generated event sent for %s",
1846 JvmtiTrace::safe_get_thread_name(thread), name));
1847 JvmtiEventMark jem(thread);
1848 JvmtiJavaThreadEventTransition jet(thread);
1849 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
1850 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
1851 if (callback != NULL) {
1852 (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
1853 }
1854 }
1855 }
1856 }
1857
1858 void JvmtiExport::post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) {
1859 // In theory everyone coming thru here is in_vm but we need to be certain
1860 // because a callee will do a vm->native transition
1861 ThreadInVMfromUnknown __tiv;
1862 jvmtiPhase phase = JvmtiEnv::get_phase();
1863 if (phase == JVMTI_PHASE_PRIMORDIAL || phase == JVMTI_PHASE_START) {
1864 post_dynamic_code_generated_internal(name, code_begin, code_end);
1865 return;
1866 }
1867
1868 if (have_pending_compiled_method_unload_events()) {
1869 post_pending_compiled_method_unload_events();
1870 }
1871 post_dynamic_code_generated_internal(name, code_begin, code_end);
1872 }
1873
1874
1875 // post a DYNAMIC_CODE_GENERATED event for a given environment
1876 // used by GenerateEvents
1877 void JvmtiExport::post_dynamic_code_generated(JvmtiEnv* env, const char *name,
1878 const void *code_begin, const void *code_end)
1879 {
1880 JavaThread* thread = JavaThread::current();
1881 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
1882 ("JVMTI [%s] dynamic code generated event triggered (by GenerateEvents)",
1883 JvmtiTrace::safe_get_thread_name(thread)));
1884 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
1885 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
1886 ("JVMTI [%s] dynamic code generated event sent for %s",
1887 JvmtiTrace::safe_get_thread_name(thread), name));
1888 JvmtiEventMark jem(thread);
1889 JvmtiJavaThreadEventTransition jet(thread);
1890 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
1891 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
1892 if (callback != NULL) {
1893 (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
1894 }
1895 }
1896 }
1897
1898 // post a DynamicCodeGenerated event while holding locks in the VM.
1899 void JvmtiExport::post_dynamic_code_generated_while_holding_locks(const char* name,
1900 address code_begin, address code_end)
1901 {
1902 // register the stub with the current dynamic code event collector
1903 JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current());
1904 JvmtiDynamicCodeEventCollector* collector = state->get_dynamic_code_event_collector();
1905 guarantee(collector != NULL, "attempt to register stub without event collector");
1906 collector->register_stub(name, code_begin, code_end);
1907 }
1908
1909 // Collect all the vm internally allocated objects which are visible to java world
1910 void JvmtiExport::record_vm_internal_object_allocation(oop obj) {
1911 Thread* thread = ThreadLocalStorage::thread();
1912 if (thread != NULL && thread->is_Java_thread()) {
1913 // Can not take safepoint here.
1914 No_Safepoint_Verifier no_sfpt;
1915 // Can not take safepoint here so can not use state_for to get
1916 // jvmti thread state.
1917 JvmtiThreadState *state = ((JavaThread*)thread)->jvmti_thread_state();
1918 if (state != NULL ) {
1919 // state is non NULL when VMObjectAllocEventCollector is enabled.
1920 JvmtiVMObjectAllocEventCollector *collector;
1921 collector = state->get_vm_object_alloc_event_collector();
1922 if (collector != NULL && collector->is_enabled()) {
1923 // Don't record classes as these will be notified via the ClassLoad
1924 // event.
1925 if (obj->klass() != SystemDictionary::class_klass()) {
1926 collector->record_allocation(obj);
1927 }
1928 }
1929 }
1930 }
1931 }
1932
1933 void JvmtiExport::post_garbage_collection_finish() {
1934 Thread *thread = Thread::current(); // this event is posted from VM-Thread.
1935 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
1936 ("JVMTI [%s] garbage collection finish event triggered",
1937 JvmtiTrace::safe_get_thread_name(thread)));
1938 JvmtiEnvIterator it;
1939 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1940 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH)) {
1941 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
1942 ("JVMTI [%s] garbage collection finish event sent ",
1943 JvmtiTrace::safe_get_thread_name(thread)));
1944 JvmtiThreadEventTransition jet(thread);
1945 // JNIEnv is NULL here because this event is posted from VM Thread
1946 jvmtiEventGarbageCollectionFinish callback = env->callbacks()->GarbageCollectionFinish;
1947 if (callback != NULL) {
1948 (*callback)(env->jvmti_external());
1949 }
1950 }
1951 }
1952 }
1953
1954 void JvmtiExport::post_garbage_collection_start() {
1955 Thread* thread = Thread::current(); // this event is posted from vm-thread.
1956 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
1957 ("JVMTI [%s] garbage collection start event triggered",
1958 JvmtiTrace::safe_get_thread_name(thread)));
1959 JvmtiEnvIterator it;
1960 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1961 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_START)) {
1962 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
1963 ("JVMTI [%s] garbage collection start event sent ",
1964 JvmtiTrace::safe_get_thread_name(thread)));
1965 JvmtiThreadEventTransition jet(thread);
1966 // JNIEnv is NULL here because this event is posted from VM Thread
1967 jvmtiEventGarbageCollectionStart callback = env->callbacks()->GarbageCollectionStart;
1968 if (callback != NULL) {
1969 (*callback)(env->jvmti_external());
1970 }
1971 }
1972 }
1973 }
1974
1975 void JvmtiExport::post_data_dump() {
1976 Thread *thread = Thread::current();
1977 EVT_TRIG_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
1978 ("JVMTI [%s] data dump request event triggered",
1979 JvmtiTrace::safe_get_thread_name(thread)));
1980 JvmtiEnvIterator it;
1981 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1982 if (env->is_enabled(JVMTI_EVENT_DATA_DUMP_REQUEST)) {
1983 EVT_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
1984 ("JVMTI [%s] data dump request event sent ",
1985 JvmtiTrace::safe_get_thread_name(thread)));
1986 JvmtiThreadEventTransition jet(thread);
1987 // JNIEnv is NULL here because this event is posted from VM Thread
1988 jvmtiEventDataDumpRequest callback = env->callbacks()->DataDumpRequest;
1989 if (callback != NULL) {
1990 (*callback)(env->jvmti_external());
1991 }
1992 }
1993 }
1994 }
1995
1996 void JvmtiExport::post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) {
1997 oop object = (oop)obj_mntr->object();
1998 if (!ServiceUtil::visible_oop(object)) {
1999 // Ignore monitor contended enter for vm internal object.
2000 return;
2001 }
2002 JvmtiThreadState *state = thread->jvmti_thread_state();
2003 if (state == NULL) {
2004 return;
2005 }
2006
2007 HandleMark hm(thread);
2008 Handle h(thread, object);
2009
2010 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2011 ("JVMTI [%s] montior contended enter event triggered",
2012 JvmtiTrace::safe_get_thread_name(thread)));
2013
2014 JvmtiEnvThreadStateIterator it(state);
2015 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2016 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTER)) {
2017 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2018 ("JVMTI [%s] monitor contended enter event sent",
2019 JvmtiTrace::safe_get_thread_name(thread)));
2020 JvmtiMonitorEventMark jem(thread, h());
2021 JvmtiEnv *env = ets->get_env();
2022 JvmtiThreadEventTransition jet(thread);
2023 jvmtiEventMonitorContendedEnter callback = env->callbacks()->MonitorContendedEnter;
2024 if (callback != NULL) {
2025 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2026 }
2027 }
2028 }
2029 }
2030
2031 void JvmtiExport::post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) {
2032 oop object = (oop)obj_mntr->object();
2033 if (!ServiceUtil::visible_oop(object)) {
2034 // Ignore monitor contended entered for vm internal object.
2035 return;
2036 }
2037 JvmtiThreadState *state = thread->jvmti_thread_state();
2038 if (state == NULL) {
2039 return;
2040 }
2041
2042 HandleMark hm(thread);
2043 Handle h(thread, object);
2044
2045 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2046 ("JVMTI [%s] montior contended entered event triggered",
2047 JvmtiTrace::safe_get_thread_name(thread)));
2048
2049 JvmtiEnvThreadStateIterator it(state);
2050 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2051 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED)) {
2052 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2053 ("JVMTI [%s] monitor contended enter event sent",
2054 JvmtiTrace::safe_get_thread_name(thread)));
2055 JvmtiMonitorEventMark jem(thread, h());
2056 JvmtiEnv *env = ets->get_env();
2057 JvmtiThreadEventTransition jet(thread);
2058 jvmtiEventMonitorContendedEntered callback = env->callbacks()->MonitorContendedEntered;
2059 if (callback != NULL) {
2060 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2061 }
2062 }
2063 }
2064 }
2065
2066 void JvmtiExport::post_monitor_wait(JavaThread *thread, oop object,
2067 jlong timeout) {
2068 JvmtiThreadState *state = thread->jvmti_thread_state();
2069 if (state == NULL) {
2070 return;
2071 }
2072
2073 HandleMark hm(thread);
2074 Handle h(thread, object);
2075
2076 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2077 ("JVMTI [%s] montior wait event triggered",
2078 JvmtiTrace::safe_get_thread_name(thread)));
2079
2080 JvmtiEnvThreadStateIterator it(state);
2081 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2082 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAIT)) {
2083 EVT_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2084 ("JVMTI [%s] monitor wait event sent ",
2085 JvmtiTrace::safe_get_thread_name(thread)));
2086 JvmtiMonitorEventMark jem(thread, h());
2087 JvmtiEnv *env = ets->get_env();
2088 JvmtiThreadEventTransition jet(thread);
2089 jvmtiEventMonitorWait callback = env->callbacks()->MonitorWait;
2090 if (callback != NULL) {
2091 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2092 jem.jni_object(), timeout);
2093 }
2094 }
2095 }
2096 }
2097
2098 void JvmtiExport::post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) {
2099 oop object = (oop)obj_mntr->object();
2100 if (!ServiceUtil::visible_oop(object)) {
2101 // Ignore monitor waited for vm internal object.
2102 return;
2103 }
2104 JvmtiThreadState *state = thread->jvmti_thread_state();
2105 if (state == NULL) {
2106 return;
2107 }
2108
2109 HandleMark hm(thread);
2110 Handle h(thread, object);
2111
2112 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2113 ("JVMTI [%s] montior waited event triggered",
2114 JvmtiTrace::safe_get_thread_name(thread)));
2115
2116 JvmtiEnvThreadStateIterator it(state);
2117 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2118 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAITED)) {
2119 EVT_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2120 ("JVMTI [%s] monitor waited event sent ",
2121 JvmtiTrace::safe_get_thread_name(thread)));
2122 JvmtiMonitorEventMark jem(thread, h());
2123 JvmtiEnv *env = ets->get_env();
2124 JvmtiThreadEventTransition jet(thread);
2125 jvmtiEventMonitorWaited callback = env->callbacks()->MonitorWaited;
2126 if (callback != NULL) {
2127 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2128 jem.jni_object(), timed_out);
2129 }
2130 }
2131 }
2132 }
2133
2134
2135 void JvmtiExport::post_vm_object_alloc(JavaThread *thread, oop object) {
2136 EVT_TRIG_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("JVMTI [%s] Trg vm object alloc triggered",
2137 JvmtiTrace::safe_get_thread_name(thread)));
2138 if (object == NULL) {
2139 return;
2140 }
2141 HandleMark hm(thread);
2142 Handle h(thread, object);
2143 JvmtiEnvIterator it;
2144 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2145 if (env->is_enabled(JVMTI_EVENT_VM_OBJECT_ALLOC)) {
2146 EVT_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("JVMTI [%s] Evt vmobject alloc sent %s",
2147 JvmtiTrace::safe_get_thread_name(thread),
2148 object==NULL? "NULL" : Klass::cast(java_lang_Class::as_klassOop(object))->external_name()));
2149
2150 JvmtiVMObjectAllocEventMark jem(thread, h());
2151 JvmtiJavaThreadEventTransition jet(thread);
2152 jvmtiEventVMObjectAlloc callback = env->callbacks()->VMObjectAlloc;
2153 if (callback != NULL) {
2154 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2155 jem.jni_jobject(), jem.jni_class(), jem.size());
2156 }
2157 }
2158 }
2159 }
2160
2161 ////////////////////////////////////////////////////////////////////////////////////////////////
2162
2163 void JvmtiExport::cleanup_thread(JavaThread* thread) {
2164 assert(JavaThread::current() == thread, "thread is not current");
2165
2166
2167 // This has to happen after the thread state is removed, which is
2168 // why it is not in post_thread_end_event like its complement
2169 // Maybe both these functions should be rolled into the posts?
2170 JvmtiEventController::thread_ended(thread);
2171 }
2172
2173 void JvmtiExport::oops_do(OopClosure* f) {
2174 JvmtiCurrentBreakpoints::oops_do(f);
2175 JvmtiVMObjectAllocEventCollector::oops_do_for_all_threads(f);
2176 }
2177
2178 // Onload raw monitor transition.
2179 void JvmtiExport::transition_pending_onload_raw_monitors() {
2180 JvmtiPendingMonitors::transition_raw_monitors();
2181 }
2182
2183 ////////////////////////////////////////////////////////////////////////////////////////////////
2184
2185 // type for the Agent_OnAttach entry point
2186 extern "C" {
2187 typedef jint (JNICALL *OnAttachEntry_t)(JavaVM*, char *, void *);
2188 }
2189
2190 #ifndef SERVICES_KERNEL
2191 jint JvmtiExport::load_agent_library(AttachOperation* op, outputStream* st) {
2192 char ebuf[1024];
2193 char buffer[JVM_MAXPATHLEN];
2194 void* library;
2195 jint result = JNI_ERR;
2196
2197 // get agent name and options
2198 const char* agent = op->arg(0);
2199 const char* absParam = op->arg(1);
2200 const char* options = op->arg(2);
2201
2202 // The abs paramter should be "true" or "false"
2203 bool is_absolute_path = (absParam != NULL) && (strcmp(absParam,"true")==0);
2204
2205
2206 // If the path is absolute we attempt to load the library. Otherwise we try to
2207 // load it from the standard dll directory.
2208
2209 if (is_absolute_path) {
2210 library = hpi::dll_load(agent, ebuf, sizeof ebuf);
2211 } else {
2212 // Try to load the agent from the standard dll directory
2213 hpi::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), agent);
2214 library = hpi::dll_load(buffer, ebuf, sizeof ebuf);
2215 if (library == NULL) {
2216 // not found - try local path
2217 char ns[1] = {0};
2218 hpi::dll_build_name(buffer, sizeof(buffer), ns, agent);
2219 library = hpi::dll_load(buffer, ebuf, sizeof ebuf);
2220 }
2221 }
2222
2223 // If the library was loaded then we attempt to invoke the Agent_OnAttach
2224 // function
2225 if (library != NULL) {
2226
2227 // Lookup the Agent_OnAttach function
2228 OnAttachEntry_t on_attach_entry = NULL;
2229 const char *on_attach_symbols[] = AGENT_ONATTACH_SYMBOLS;
2230 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_attach_symbols); symbol_index++) {
2231 on_attach_entry =
2232 CAST_TO_FN_PTR(OnAttachEntry_t, hpi::dll_lookup(library, on_attach_symbols[symbol_index]));
2233 if (on_attach_entry != NULL) break;
2234 }
2235
2236 if (on_attach_entry == NULL) {
2237 // Agent_OnAttach missing - unload library
2238 hpi::dll_unload(library);
2239 } else {
2240 // Invoke the Agent_OnAttach function
2241 JavaThread* THREAD = JavaThread::current();
2242 {
2243 extern struct JavaVM_ main_vm;
2244 JvmtiThreadEventMark jem(THREAD);
2245 JvmtiJavaThreadEventTransition jet(THREAD);
2246
2247 result = (*on_attach_entry)(&main_vm, (char*)options, NULL);
2248 }
2249
2250 // Agent_OnAttach may have used JNI
2251 if (HAS_PENDING_EXCEPTION) {
2252 CLEAR_PENDING_EXCEPTION;
2253 }
2254
2255 // If OnAttach returns JNI_OK then we add it to the list of
2256 // agent libraries so that we can call Agent_OnUnload later.
2257 if (result == JNI_OK) {
2258 Arguments::add_loaded_agent(agent, (char*)options, is_absolute_path, library);
2259 }
2260
2261 // Agent_OnAttach executed so completion status is JNI_OK
2262 st->print_cr("%d", result);
2263 result = JNI_OK;
2264 }
2265 }
2266 return result;
2267 }
2268 #endif // SERVICES_KERNEL
2269
2270 // CMS has completed referencing processing so may need to update
2271 // tag maps.
2272 void JvmtiExport::cms_ref_processing_epilogue() {
2273 if (JvmtiEnv::environments_might_exist()) {
2274 JvmtiTagMap::cms_ref_processing_epilogue();
2275 }
2276 }
2277
2278
2279 ////////////////////////////////////////////////////////////////////////////////////////////////
2280
2281 // Setup current current thread for event collection.
2282 void JvmtiEventCollector::setup_jvmti_thread_state() {
2283 // set this event collector to be the current one.
2284 JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current());
2285 if (is_vm_object_alloc_event()) {
2286 _prev = state->get_vm_object_alloc_event_collector();
2287 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)this);
2288 } else if (is_dynamic_code_event()) {
2289 _prev = state->get_dynamic_code_event_collector();
2290 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)this);
2291 }
2292 }
2293
2294 // Unset current event collection in this thread and reset it with previous
2295 // collector.
2296 void JvmtiEventCollector::unset_jvmti_thread_state() {
2297 JvmtiThreadState* state = JavaThread::current()->jvmti_thread_state();
2298 if (state != NULL) {
2299 // restore the previous event collector (if any)
2300 if (is_vm_object_alloc_event()) {
2301 if (state->get_vm_object_alloc_event_collector() == this) {
2302 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)_prev);
2303 } else {
2304 // this thread's jvmti state was created during the scope of
2305 // the event collector.
2306 }
2307 } else {
2308 if (is_dynamic_code_event()) {
2309 if (state->get_dynamic_code_event_collector() == this) {
2310 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)_prev);
2311 } else {
2312 // this thread's jvmti state was created during the scope of
2313 // the event collector.
2314 }
2315 }
2316 }
2317 }
2318 }
2319
2320 // create the dynamic code event collector
2321 JvmtiDynamicCodeEventCollector::JvmtiDynamicCodeEventCollector() : _code_blobs(NULL) {
2322 if (JvmtiExport::should_post_dynamic_code_generated()) {
2323 setup_jvmti_thread_state();
2324 }
2325 }
2326
2327 // iterate over any code blob descriptors collected and post a
2328 // DYNAMIC_CODE_GENERATED event to the profiler.
2329 JvmtiDynamicCodeEventCollector::~JvmtiDynamicCodeEventCollector() {
2330 assert(!JavaThread::current()->owns_locks(), "all locks must be released to post deferred events");
2331 // iterate over any code blob descriptors that we collected
2332 if (_code_blobs != NULL) {
2333 for (int i=0; i<_code_blobs->length(); i++) {
2334 JvmtiCodeBlobDesc* blob = _code_blobs->at(i);
2335 JvmtiExport::post_dynamic_code_generated(blob->name(), blob->code_begin(), blob->code_end());
2336 FreeHeap(blob);
2337 }
2338 delete _code_blobs;
2339 }
2340 unset_jvmti_thread_state();
2341 }
2342
2343 // register a stub
2344 void JvmtiDynamicCodeEventCollector::register_stub(const char* name, address start, address end) {
2345 if (_code_blobs == NULL) {
2346 _code_blobs = new (ResourceObj::C_HEAP) GrowableArray<JvmtiCodeBlobDesc*>(1,true);
2347 }
2348 _code_blobs->append(new JvmtiCodeBlobDesc(name, start, end));
2349 }
2350
2351 // Setup current thread to record vm allocated objects.
2352 JvmtiVMObjectAllocEventCollector::JvmtiVMObjectAllocEventCollector() : _allocated(NULL) {
2353 if (JvmtiExport::should_post_vm_object_alloc()) {
2354 _enable = true;
2355 setup_jvmti_thread_state();
2356 } else {
2357 _enable = false;
2358 }
2359 }
2360
2361 // Post vm_object_alloc event for vm allocated objects visible to java
2362 // world.
2363 JvmtiVMObjectAllocEventCollector::~JvmtiVMObjectAllocEventCollector() {
2364 if (_allocated != NULL) {
2365 set_enabled(false);
2366 for (int i = 0; i < _allocated->length(); i++) {
2367 oop obj = _allocated->at(i);
2368 if (ServiceUtil::visible_oop(obj)) {
2369 JvmtiExport::post_vm_object_alloc(JavaThread::current(), obj);
2370 }
2371 }
2372 delete _allocated;
2373 }
2374 unset_jvmti_thread_state();
2375 }
2376
2377 void JvmtiVMObjectAllocEventCollector::record_allocation(oop obj) {
2378 assert(is_enabled(), "VM object alloc event collector is not enabled");
2379 if (_allocated == NULL) {
2380 _allocated = new (ResourceObj::C_HEAP) GrowableArray<oop>(1, true);
2381 }
2382 _allocated->push(obj);
2383 }
2384
2385 // GC support.
2386 void JvmtiVMObjectAllocEventCollector::oops_do(OopClosure* f) {
2387 if (_allocated != NULL) {
2388 for(int i=_allocated->length() - 1; i >= 0; i--) {
2389 if (_allocated->at(i) != NULL) {
2390 f->do_oop(_allocated->adr_at(i));
2391 }
2392 }
2393 }
2394 }
2395
2396 void JvmtiVMObjectAllocEventCollector::oops_do_for_all_threads(OopClosure* f) {
2397 // no-op if jvmti not enabled
2398 if (!JvmtiEnv::environments_might_exist()) {
2399 return;
2400 }
2401
2402 // Runs at safepoint. So no need to acquire Threads_lock.
2403 for (JavaThread *jthr = Threads::first(); jthr != NULL; jthr = jthr->next()) {
2404 JvmtiThreadState *state = jthr->jvmti_thread_state();
2405 if (state != NULL) {
2406 JvmtiVMObjectAllocEventCollector *collector;
2407 collector = state->get_vm_object_alloc_event_collector();
2408 while (collector != NULL) {
2409 collector->oops_do(f);
2410 collector = (JvmtiVMObjectAllocEventCollector *)collector->get_prev();
2411 }
2412 }
2413 }
2414 }
2415
2416
2417 // Disable collection of VMObjectAlloc events
2418 NoJvmtiVMObjectAllocMark::NoJvmtiVMObjectAllocMark() : _collector(NULL) {
2419 // a no-op if VMObjectAlloc event is not enabled
2420 if (!JvmtiExport::should_post_vm_object_alloc()) {
2421 return;
2422 }
2423 Thread* thread = ThreadLocalStorage::thread();
2424 if (thread != NULL && thread->is_Java_thread()) {
2425 JavaThread* current_thread = (JavaThread*)thread;
2426 JvmtiThreadState *state = current_thread->jvmti_thread_state();
2427 if (state != NULL) {
2428 JvmtiVMObjectAllocEventCollector *collector;
2429 collector = state->get_vm_object_alloc_event_collector();
2430 if (collector != NULL && collector->is_enabled()) {
2431 _collector = collector;
2432 _collector->set_enabled(false);
2433 }
2434 }
2435 }
2436 }
2437
2438 // Re-Enable collection of VMObjectAlloc events (if previously enabled)
2439 NoJvmtiVMObjectAllocMark::~NoJvmtiVMObjectAllocMark() {
2440 if (was_enabled()) {
2441 _collector->set_enabled(true);
2442 }
2443 };
2444
2445 JvmtiGCMarker::JvmtiGCMarker(bool full) : _full(full), _invocation_count(0) {
2446 assert(Thread::current()->is_VM_thread(), "wrong thread");
2447
2448 // if there aren't any JVMTI environments then nothing to do
2449 if (!JvmtiEnv::environments_might_exist()) {
2450 return;
2451 }
2452
2453 if (ForceFullGCJVMTIEpilogues) {
2454 // force 'Full GC' was done semantics for JVMTI GC epilogues
2455 _full = true;
2456 }
2457
2458 // GarbageCollectionStart event posted from VM thread - okay because
2459 // JVMTI is clear that the "world is stopped" and callback shouldn't
2460 // try to call into the VM.
2461 if (JvmtiExport::should_post_garbage_collection_start()) {
2462 JvmtiExport::post_garbage_collection_start();
2463 }
2464
2465 // if "full" is false it probably means this is a scavenge of the young
2466 // generation. However it could turn out that a "full" GC is required
2467 // so we record the number of collections so that it can be checked in
2468 // the destructor.
2469 if (!_full) {
2470 _invocation_count = Universe::heap()->total_full_collections();
2471 }
2472
2473 // Do clean up tasks that need to be done at a safepoint
2474 JvmtiEnvBase::check_for_periodic_clean_up();
2475 }
2476
2477 JvmtiGCMarker::~JvmtiGCMarker() {
2478 // if there aren't any JVMTI environments then nothing to do
2479 if (!JvmtiEnv::environments_might_exist()) {
2480 return;
2481 }
2482
2483 // JVMTI notify gc finish
2484 if (JvmtiExport::should_post_garbage_collection_finish()) {
2485 JvmtiExport::post_garbage_collection_finish();
2486 }
2487
2488 // we might have initially started out doing a scavenge of the young
2489 // generation but could have ended up doing a "full" GC - check the
2490 // GC count to see.
2491 if (!_full) {
2492 _full = (_invocation_count != Universe::heap()->total_full_collections());
2493 }
2494
2495 // Full collection probably means the perm generation has been GC'ed
2496 // so we clear the breakpoint cache.
2497 if (_full) {
2498 JvmtiCurrentBreakpoints::gc_epilogue();
2499 }
2500
2501 // Notify heap/object tagging support
2502 JvmtiTagMap::gc_epilogue(_full);
2503 }
2504 #endif // JVMTI_KERNEL