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comparison src/share/vm/prims/jvmtiEventController.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2003-2007 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/_jvmtiEventController.cpp.incl"
27
28 #ifdef JVMTI_TRACE
29 #define EC_TRACE(out) if (JvmtiTrace::trace_event_controller()) { SafeResourceMark rm; tty->print_cr out; } while (0)
30 #else
31 #define EC_TRACE(out)
32 #endif /*JVMTI_TRACE */
33
34 // bits for standard events
35
36 static const jlong SINGLE_STEP_BIT = (((jlong)1) << (JVMTI_EVENT_SINGLE_STEP - TOTAL_MIN_EVENT_TYPE_VAL));
37 static const jlong FRAME_POP_BIT = (((jlong)1) << (JVMTI_EVENT_FRAME_POP - TOTAL_MIN_EVENT_TYPE_VAL));
38 static const jlong BREAKPOINT_BIT = (((jlong)1) << (JVMTI_EVENT_BREAKPOINT - TOTAL_MIN_EVENT_TYPE_VAL));
39 static const jlong FIELD_ACCESS_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_ACCESS - TOTAL_MIN_EVENT_TYPE_VAL));
40 static const jlong FIELD_MODIFICATION_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_MODIFICATION - TOTAL_MIN_EVENT_TYPE_VAL));
41 static const jlong METHOD_ENTRY_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_ENTRY - TOTAL_MIN_EVENT_TYPE_VAL));
42 static const jlong METHOD_EXIT_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_EXIT - TOTAL_MIN_EVENT_TYPE_VAL));
43 static const jlong CLASS_FILE_LOAD_HOOK_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_FILE_LOAD_HOOK - TOTAL_MIN_EVENT_TYPE_VAL));
44 static const jlong NATIVE_METHOD_BIND_BIT = (((jlong)1) << (JVMTI_EVENT_NATIVE_METHOD_BIND - TOTAL_MIN_EVENT_TYPE_VAL));
45 static const jlong VM_START_BIT = (((jlong)1) << (JVMTI_EVENT_VM_START - TOTAL_MIN_EVENT_TYPE_VAL));
46 static const jlong VM_INIT_BIT = (((jlong)1) << (JVMTI_EVENT_VM_INIT - TOTAL_MIN_EVENT_TYPE_VAL));
47 static const jlong VM_DEATH_BIT = (((jlong)1) << (JVMTI_EVENT_VM_DEATH - TOTAL_MIN_EVENT_TYPE_VAL));
48 static const jlong CLASS_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_LOAD - TOTAL_MIN_EVENT_TYPE_VAL));
49 static const jlong CLASS_PREPARE_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_PREPARE - TOTAL_MIN_EVENT_TYPE_VAL));
50 static const jlong THREAD_START_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_START - TOTAL_MIN_EVENT_TYPE_VAL));
51 static const jlong THREAD_END_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_END - TOTAL_MIN_EVENT_TYPE_VAL));
52 static const jlong EXCEPTION_THROW_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION - TOTAL_MIN_EVENT_TYPE_VAL));
53 static const jlong EXCEPTION_CATCH_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION_CATCH - TOTAL_MIN_EVENT_TYPE_VAL));
54 static const jlong MONITOR_CONTENDED_ENTER_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTER - TOTAL_MIN_EVENT_TYPE_VAL));
55 static const jlong MONITOR_CONTENDED_ENTERED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTERED - TOTAL_MIN_EVENT_TYPE_VAL));
56 static const jlong MONITOR_WAIT_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAIT - TOTAL_MIN_EVENT_TYPE_VAL));
57 static const jlong MONITOR_WAITED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAITED - TOTAL_MIN_EVENT_TYPE_VAL));
58 static const jlong DYNAMIC_CODE_GENERATED_BIT = (((jlong)1) << (JVMTI_EVENT_DYNAMIC_CODE_GENERATED - TOTAL_MIN_EVENT_TYPE_VAL));
59 static const jlong DATA_DUMP_BIT = (((jlong)1) << (JVMTI_EVENT_DATA_DUMP_REQUEST - TOTAL_MIN_EVENT_TYPE_VAL));
60 static const jlong COMPILED_METHOD_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_LOAD - TOTAL_MIN_EVENT_TYPE_VAL));
61 static const jlong COMPILED_METHOD_UNLOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
62 static const jlong GARBAGE_COLLECTION_START_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_START - TOTAL_MIN_EVENT_TYPE_VAL));
63 static const jlong GARBAGE_COLLECTION_FINISH_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_FINISH - TOTAL_MIN_EVENT_TYPE_VAL));
64 static const jlong OBJECT_FREE_BIT = (((jlong)1) << (JVMTI_EVENT_OBJECT_FREE - TOTAL_MIN_EVENT_TYPE_VAL));
65 static const jlong RESOURCE_EXHAUSTED_BIT = (((jlong)1) << (JVMTI_EVENT_RESOURCE_EXHAUSTED - TOTAL_MIN_EVENT_TYPE_VAL));
66 static const jlong VM_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_VM_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL));
67
68 // bits for extension events
69 static const jlong CLASS_UNLOAD_BIT = (((jlong)1) << (EXT_EVENT_CLASS_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
70
71
72 static const jlong MONITOR_BITS = MONITOR_CONTENDED_ENTER_BIT | MONITOR_CONTENDED_ENTERED_BIT |
73 MONITOR_WAIT_BIT | MONITOR_WAITED_BIT;
74 static const jlong EXCEPTION_BITS = EXCEPTION_THROW_BIT | EXCEPTION_CATCH_BIT;
75 static const jlong INTERP_EVENT_BITS = SINGLE_STEP_BIT | METHOD_ENTRY_BIT | METHOD_EXIT_BIT |
76 FRAME_POP_BIT | FIELD_ACCESS_BIT | FIELD_MODIFICATION_BIT;
77 static const jlong THREAD_FILTERED_EVENT_BITS = INTERP_EVENT_BITS | EXCEPTION_BITS | MONITOR_BITS |
78 BREAKPOINT_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | THREAD_END_BIT;
79 static const jlong NEED_THREAD_LIFE_EVENTS = THREAD_FILTERED_EVENT_BITS | THREAD_START_BIT;
80 static const jlong EARLY_EVENT_BITS = CLASS_FILE_LOAD_HOOK_BIT |
81 VM_START_BIT | VM_INIT_BIT | VM_DEATH_BIT | NATIVE_METHOD_BIND_BIT |
82 THREAD_START_BIT | THREAD_END_BIT |
83 DYNAMIC_CODE_GENERATED_BIT;
84 static const jlong GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS;
85
86
87 ///////////////////////////////////////////////////////////////
88 //
89 // JvmtiEventEnabled
90 //
91
92 JvmtiEventEnabled::JvmtiEventEnabled() {
93 clear();
94 }
95
96
97 void JvmtiEventEnabled::clear() {
98 _enabled_bits = 0;
99 #ifndef PRODUCT
100 _init_guard = JEE_INIT_GUARD;
101 #endif
102 }
103
104 void JvmtiEventEnabled::set_enabled(jvmtiEvent event_type, bool enabled) {
105 jlong bits = get_bits();
106 jlong mask = bit_for(event_type);
107 if (enabled) {
108 bits |= mask;
109 } else {
110 bits &= ~mask;
111 }
112 set_bits(bits);
113 }
114
115
116 ///////////////////////////////////////////////////////////////
117 //
118 // JvmtiEnvThreadEventEnable
119 //
120
121 JvmtiEnvThreadEventEnable::JvmtiEnvThreadEventEnable() {
122 _event_user_enabled.clear();
123 _event_enabled.clear();
124 }
125
126
127 JvmtiEnvThreadEventEnable::~JvmtiEnvThreadEventEnable() {
128 _event_user_enabled.clear();
129 _event_enabled.clear();
130 }
131
132
133 ///////////////////////////////////////////////////////////////
134 //
135 // JvmtiThreadEventEnable
136 //
137
138 JvmtiThreadEventEnable::JvmtiThreadEventEnable() {
139 _event_enabled.clear();
140 }
141
142
143 JvmtiThreadEventEnable::~JvmtiThreadEventEnable() {
144 _event_enabled.clear();
145 }
146
147
148 ///////////////////////////////////////////////////////////////
149 //
150 // JvmtiEnvEventEnable
151 //
152
153 JvmtiEnvEventEnable::JvmtiEnvEventEnable() {
154 _event_user_enabled.clear();
155 _event_callback_enabled.clear();
156 _event_enabled.clear();
157 }
158
159
160 JvmtiEnvEventEnable::~JvmtiEnvEventEnable() {
161 _event_user_enabled.clear();
162 _event_callback_enabled.clear();
163 _event_enabled.clear();
164 }
165
166
167 ///////////////////////////////////////////////////////////////
168 //
169 // VM_EnterInterpOnlyMode
170 //
171
172 class VM_EnterInterpOnlyMode : public VM_Operation {
173 private:
174 JvmtiThreadState *_state;
175
176 public:
177 VM_EnterInterpOnlyMode(JvmtiThreadState *state);
178
179 bool allow_nested_vm_operations() const { return true; }
180 VMOp_Type type() const { return VMOp_EnterInterpOnlyMode; }
181 void doit();
182
183 // to do: this same function is in jvmtiImpl - should be in one place
184 bool can_be_deoptimized(vframe* vf) {
185 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized());
186 }
187 };
188
189 VM_EnterInterpOnlyMode::VM_EnterInterpOnlyMode(JvmtiThreadState *state)
190 : _state(state)
191 {
192 }
193
194
195 void VM_EnterInterpOnlyMode::doit() {
196 // Set up the current stack depth for later tracking
197 _state->invalidate_cur_stack_depth();
198
199 _state->enter_interp_only_mode();
200
201 JavaThread *thread = _state->get_thread();
202 if (thread->has_last_Java_frame()) {
203 // If running in fullspeed mode, single stepping is implemented
204 // as follows: first, the interpreter does not dispatch to
205 // compiled code for threads that have single stepping enabled;
206 // second, we deoptimize all methods on the thread's stack when
207 // interpreted-only mode is enabled the first time for a given
208 // thread (nothing to do if no Java frames yet).
209 int num_marked = 0;
210 ResourceMark resMark;
211 RegisterMap rm(thread, false);
212 for (vframe* vf = thread->last_java_vframe(&rm); vf; vf = vf->sender()) {
213 if (can_be_deoptimized(vf)) {
214 ((compiledVFrame*) vf)->code()->mark_for_deoptimization();
215 ++num_marked;
216 }
217 }
218 if (num_marked > 0) {
219 VM_Deoptimize op;
220 VMThread::execute(&op);
221 }
222 }
223 }
224
225
226 ///////////////////////////////////////////////////////////////
227 //
228 // VM_ChangeSingleStep
229 //
230
231 class VM_ChangeSingleStep : public VM_Operation {
232 private:
233 bool _on;
234
235 public:
236 VM_ChangeSingleStep(bool on);
237 VMOp_Type type() const { return VMOp_ChangeSingleStep; }
238 bool allow_nested_vm_operations() const { return true; }
239 void doit(); // method definition is after definition of JvmtiEventControllerPrivate because of scoping
240 };
241
242
243 VM_ChangeSingleStep::VM_ChangeSingleStep(bool on)
244 : _on(on != 0)
245 {
246 }
247
248
249
250
251 ///////////////////////////////////////////////////////////////
252 //
253 // JvmtiEventControllerPrivate
254 //
255 // Private internal implementation methods for JvmtiEventController.
256 //
257 // These methods are thread safe either because they are called
258 // in early VM initialization which is single threaded, or they
259 // hold the JvmtiThreadState_lock.
260 //
261
262 class JvmtiEventControllerPrivate : public AllStatic {
263 static bool _initialized;
264 public:
265 static void set_should_post_single_step(bool on);
266 static void enter_interp_only_mode(JvmtiThreadState *state);
267 static void leave_interp_only_mode(JvmtiThreadState *state);
268 static void recompute_enabled();
269 static jlong recompute_env_enabled(JvmtiEnvBase* env);
270 static jlong recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state);
271 static jlong recompute_thread_enabled(JvmtiThreadState *state);
272 static void event_init();
273
274 static void set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
275 jvmtiEvent event_type, bool enabled);
276 static void set_event_callbacks(JvmtiEnvBase *env,
277 const jvmtiEventCallbacks* callbacks,
278 jint size_of_callbacks);
279
280 static void set_extension_event_callback(JvmtiEnvBase *env,
281 jint extension_event_index,
282 jvmtiExtensionEvent callback);
283
284 static void set_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
285 static void clear_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
286 static void clear_to_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
287 static void change_field_watch(jvmtiEvent event_type, bool added);
288
289 static void thread_started(JavaThread *thread);
290 static void thread_ended(JavaThread *thread);
291
292 static void env_initialize(JvmtiEnvBase *env);
293 static void env_dispose(JvmtiEnvBase *env);
294
295 static void vm_start();
296 static void vm_init();
297 static void vm_death();
298
299 static void trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed);
300 static void trace_changed(jlong now_enabled, jlong changed);
301 };
302
303 bool JvmtiEventControllerPrivate::_initialized = false;
304
305 void JvmtiEventControllerPrivate::set_should_post_single_step(bool on) {
306 // we have permission to do this, VM op doesn't
307 JvmtiExport::set_should_post_single_step(on);
308 }
309
310
311 // This change must always be occur when at a safepoint.
312 // Being at a safepoint causes the interpreter to use the
313 // safepoint dispatch table which we overload to find single
314 // step points. Just to be sure that it has been set, we
315 // call notice_safepoints when turning on single stepping.
316 // When we leave our current safepoint, should_post_single_step
317 // will be checked by the interpreter, and the table kept
318 // or changed accordingly.
319 void VM_ChangeSingleStep::doit() {
320 JvmtiEventControllerPrivate::set_should_post_single_step(_on);
321 if (_on) {
322 Interpreter::notice_safepoints();
323 }
324 }
325
326
327 void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) {
328 EC_TRACE(("JVMTI [%s] # Entering interpreter only mode",
329 JvmtiTrace::safe_get_thread_name(state->get_thread())));
330
331 VM_EnterInterpOnlyMode op(state);
332 VMThread::execute(&op);
333 }
334
335
336 void
337 JvmtiEventControllerPrivate::leave_interp_only_mode(JvmtiThreadState *state) {
338 EC_TRACE(("JVMTI [%s] # Leaving interpreter only mode",
339 JvmtiTrace::safe_get_thread_name(state->get_thread())));
340 state->leave_interp_only_mode();
341 }
342
343
344 void
345 JvmtiEventControllerPrivate::trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed) {
346 #ifdef JVMTI_TRACE
347 if (JvmtiTrace::trace_event_controller()) {
348 SafeResourceMark rm;
349 // traces standard events only
350 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
351 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
352 if (changed & bit) {
353 // it changed, print it
354 tty->print_cr("JVMTI [%s] # %s event %s",
355 JvmtiTrace::safe_get_thread_name(state->get_thread()),
356 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
357 }
358 }
359 }
360 #endif /*JVMTI_TRACE */
361 }
362
363
364 void
365 JvmtiEventControllerPrivate::trace_changed(jlong now_enabled, jlong changed) {
366 #ifdef JVMTI_TRACE
367 if (JvmtiTrace::trace_event_controller()) {
368 SafeResourceMark rm;
369 // traces standard events only
370 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
371 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
372 if (changed & bit) {
373 // it changed, print it
374 tty->print_cr("JVMTI [-] # %s event %s",
375 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
376 }
377 }
378 }
379 #endif /*JVMTI_TRACE */
380 }
381
382
383 // For the specified env: compute the currently truly enabled events
384 // set external state accordingly.
385 // Return value and set value must include all events.
386 // But outside this class, only non-thread-filtered events can be queried..
387 jlong
388 JvmtiEventControllerPrivate::recompute_env_enabled(JvmtiEnvBase* env) {
389 jlong was_enabled = env->env_event_enable()->_event_enabled.get_bits();
390 jlong now_enabled =
391 env->env_event_enable()->_event_callback_enabled.get_bits() &
392 env->env_event_enable()->_event_user_enabled.get_bits();
393
394 switch (JvmtiEnv::get_phase()) {
395 case JVMTI_PHASE_PRIMORDIAL:
396 case JVMTI_PHASE_ONLOAD:
397 // only these events allowed in primordial or onload phase
398 now_enabled &= (EARLY_EVENT_BITS & ~THREAD_FILTERED_EVENT_BITS);
399 break;
400 case JVMTI_PHASE_START:
401 // only these events allowed in start phase
402 now_enabled &= EARLY_EVENT_BITS;
403 break;
404 case JVMTI_PHASE_LIVE:
405 // all events allowed during live phase
406 break;
407 case JVMTI_PHASE_DEAD:
408 // no events allowed when dead
409 now_enabled = 0;
410 break;
411 default:
412 assert(false, "no other phases - sanity check");
413 break;
414 }
415
416 // will we really send these events to this env
417 env->env_event_enable()->_event_enabled.set_bits(now_enabled);
418
419 trace_changed(now_enabled, (now_enabled ^ was_enabled) & ~THREAD_FILTERED_EVENT_BITS);
420
421 return now_enabled;
422 }
423
424
425 // For the specified env and thread: compute the currently truly enabled events
426 // set external state accordingly. Only thread-filtered events are included.
427 jlong
428 JvmtiEventControllerPrivate::recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state) {
429 JvmtiEnv *env = ets->get_env();
430
431 jlong was_enabled = ets->event_enable()->_event_enabled.get_bits();
432 jlong now_enabled = THREAD_FILTERED_EVENT_BITS &
433 env->env_event_enable()->_event_callback_enabled.get_bits() &
434 (env->env_event_enable()->_event_user_enabled.get_bits() |
435 ets->event_enable()->_event_user_enabled.get_bits());
436
437 // for frame pops and field watchs, computed enabled state
438 // is only true if an event has been requested
439 if (!ets->has_frame_pops()) {
440 now_enabled &= ~FRAME_POP_BIT;
441 }
442 if (*((int *)JvmtiExport::get_field_access_count_addr()) == 0) {
443 now_enabled &= ~FIELD_ACCESS_BIT;
444 }
445 if (*((int *)JvmtiExport::get_field_modification_count_addr()) == 0) {
446 now_enabled &= ~FIELD_MODIFICATION_BIT;
447 }
448
449 switch (JvmtiEnv::get_phase()) {
450 case JVMTI_PHASE_DEAD:
451 // no events allowed when dead
452 now_enabled = 0;
453 break;
454 }
455
456 // if anything changed do update
457 if (now_enabled != was_enabled) {
458
459 // will we really send these events to this thread x env
460 ets->event_enable()->_event_enabled.set_bits(now_enabled);
461
462 // If the enabled status of the single step or breakpoint events changed,
463 // the location status may need to change as well.
464 jlong changed = now_enabled ^ was_enabled;
465 if (changed & SINGLE_STEP_BIT) {
466 ets->reset_current_location(JVMTI_EVENT_SINGLE_STEP, (now_enabled & SINGLE_STEP_BIT) != 0);
467 }
468 if (changed & BREAKPOINT_BIT) {
469 ets->reset_current_location(JVMTI_EVENT_BREAKPOINT, (now_enabled & BREAKPOINT_BIT) != 0);
470 }
471 trace_changed(state, now_enabled, changed);
472 }
473 return now_enabled;
474 }
475
476
477 // For the specified thread: compute the currently truly enabled events
478 // set external state accordingly. Only thread-filtered events are included.
479 jlong
480 JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) {
481 jlong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits();
482 jlong any_env_enabled = 0;
483
484 {
485 // This iteration will include JvmtiEnvThreadStates whoses environments
486 // have been disposed. These JvmtiEnvThreadStates must not be filtered
487 // as recompute must be called on them to disable their events,
488 JvmtiEnvThreadStateIterator it(state);
489 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
490 any_env_enabled |= recompute_env_thread_enabled(ets, state);
491 }
492 }
493
494 if (any_env_enabled != was_any_env_enabled) {
495 // mark if event is truly enabled on this thread in any environment
496 state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled);
497
498 // compute interp_only mode
499 bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0;
500 bool is_now_interp = state->is_interp_only_mode();
501
502 if (should_be_interp != is_now_interp) {
503 if (should_be_interp) {
504 enter_interp_only_mode(state);
505 } else {
506 leave_interp_only_mode(state);
507 }
508 }
509 }
510 return any_env_enabled;
511 }
512
513
514 // Compute truly enabled events - meaning if the event can and could be
515 // sent. An event is truly enabled if it is user enabled on the thread
516 // or globally user enabled, but only if there is a callback or event hook
517 // for it and, for field watch and frame pop, one has been set.
518 // Compute if truly enabled, per thread, per environment, per combination
519 // (thread x environment), and overall. These merges are true if any is true.
520 // True per thread if some environment has callback set and the event is globally
521 // enabled or enabled for this thread.
522 // True per environment if the callback is set and the event is globally
523 // enabled in this environment or enabled for any thread in this environment.
524 // True per combination if the environment has the callback set and the
525 // event is globally enabled in this environment or the event is enabled
526 // for this thread and environment.
527 //
528 // All states transitions dependent on these transitions are also handled here.
529 void
530 JvmtiEventControllerPrivate::recompute_enabled() {
531 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
532
533 // event enabled for any thread in any environment
534 jlong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits();
535 jlong any_env_thread_enabled = 0;
536
537 EC_TRACE(("JVMTI [-] # recompute enabled - before %llx", was_any_env_thread_enabled));
538
539 // compute non-thread-filters events.
540 // This must be done separately from thread-filtered events, since some
541 // events can occur before any threads exist.
542 JvmtiEnvIterator it;
543 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
544 any_env_thread_enabled |= recompute_env_enabled(env);
545 }
546
547 // We need to create any missing jvmti_thread_state if there are globally set thread
548 // filtered events and there weren't last time
549 if ( (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 &&
550 (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) {
551 assert(JvmtiEnv::is_vm_live() || (JvmtiEnv::get_phase()==JVMTI_PHASE_START),
552 "thread filtered events should not be enabled when VM not in start or live phase");
553 {
554 MutexLocker mu(Threads_lock); //hold the Threads_lock for the iteration
555 for (JavaThread *tp = Threads::first(); tp != NULL; tp = tp->next()) {
556 JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing
557 }
558 }// release Threads_lock
559 }
560
561 // compute and set thread-filtered events
562 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
563 any_env_thread_enabled |= recompute_thread_enabled(state);
564 }
565
566 // set universal state (across all envs and threads)
567 jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled;
568 if (delta != 0) {
569 JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0);
570 JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0);
571 JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0);
572 JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0);
573 JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0);
574 JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0);
575 JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0);
576 JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0);
577 JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0);
578 JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0);
579 JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0);
580 JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0);
581 JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0);
582 JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0);
583 JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0);
584 JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0);
585 JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0);
586 JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0);
587 JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0);
588 JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0);
589
590 // need this if we want thread events or we need them to init data
591 JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0);
592
593 // If single stepping is turned on or off, execute the VM op to change it.
594 if (delta & SINGLE_STEP_BIT) {
595 switch (JvmtiEnv::get_phase()) {
596 case JVMTI_PHASE_DEAD:
597 // If the VM is dying we can't execute VM ops
598 break;
599 case JVMTI_PHASE_LIVE: {
600 VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0);
601 VMThread::execute(&op);
602 break;
603 }
604 default:
605 assert(false, "should never come here before live phase");
606 break;
607 }
608 }
609
610 // set global truly enabled, that is, any thread in any environment
611 JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled);
612 }
613
614 EC_TRACE(("JVMTI [-] # recompute enabled - after %llx", any_env_thread_enabled));
615 }
616
617
618 void
619 JvmtiEventControllerPrivate::thread_started(JavaThread *thread) {
620 assert(thread->is_Java_thread(), "Must be JavaThread");
621 assert(thread == Thread::current(), "must be current thread");
622 assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist");
623
624 EC_TRACE(("JVMTI [%s] # thread started", JvmtiTrace::safe_get_thread_name(thread)));
625
626 // if we have any thread filtered events globally enabled, create/update the thread state
627 if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) {
628 MutexLocker mu(JvmtiThreadState_lock);
629 // create the thread state if missing
630 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
631 if (state != NULL) { // skip threads with no JVMTI thread state
632 recompute_thread_enabled(state);
633 }
634 }
635 }
636
637
638 void
639 JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) {
640 // Removes the JvmtiThreadState associated with the specified thread.
641 // May be called after all environments have been disposed.
642
643 EC_TRACE(("JVMTI [%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread)));
644
645 JvmtiThreadState *state = thread->jvmti_thread_state();
646 if (state != NULL) {
647 MutexLocker mu(JvmtiThreadState_lock);
648 delete state;
649 }
650 }
651
652 void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env,
653 const jvmtiEventCallbacks* callbacks,
654 jint size_of_callbacks) {
655 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
656 EC_TRACE(("JVMTI [*] # set event callbacks"));
657
658 env->set_event_callbacks(callbacks, size_of_callbacks);
659 jlong enabled_bits = 0;
660 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
661 jvmtiEvent evt_t = (jvmtiEvent)ei;
662 if (env->has_callback(evt_t)) {
663 enabled_bits |= JvmtiEventEnabled::bit_for(evt_t);
664 }
665 }
666 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
667 recompute_enabled();
668 }
669
670 void
671 JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env,
672 jint extension_event_index,
673 jvmtiExtensionEvent callback)
674 {
675 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
676 EC_TRACE(("JVMTI [*] # set extension event callback"));
677
678 // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL
679 assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL &&
680 extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check");
681
682
683 // As the bits for both standard (jvmtiEvent) and extension
684 // (jvmtiExtEvents) are stored in the same word we cast here to
685 // jvmtiEvent to set/clear the bit for this extension event.
686 jvmtiEvent event_type = (jvmtiEvent)extension_event_index;
687
688 // Prevent a possible race condition where events are re-enabled by a call to
689 // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate
690 // environment check and before the lock is acquired.
691 // We can safely do the is_valid check now, as JvmtiThreadState_lock is held.
692 bool enabling = (callback != NULL) && (env->is_valid());
693 env->env_event_enable()->set_user_enabled(event_type, enabling);
694
695 // update the callback
696 jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks();
697 switch (extension_event_index) {
698 case EXT_EVENT_CLASS_UNLOAD :
699 ext_callbacks->ClassUnload = callback;
700 break;
701 default:
702 ShouldNotReachHere();
703 }
704
705 // update the callback enable/disable bit
706 jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits();
707 jlong bit_for = JvmtiEventEnabled::bit_for(event_type);
708 if (enabling) {
709 enabled_bits |= bit_for;
710 } else {
711 enabled_bits &= ~bit_for;
712 }
713 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
714
715 recompute_enabled();
716 }
717
718
719 void
720 JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) {
721 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
722 EC_TRACE(("JVMTI [*] # env initialize"));
723
724 if (JvmtiEnvBase::is_vm_live()) {
725 // if we didn't initialize event info already (this is a late
726 // launched environment), do it now.
727 event_init();
728 }
729
730 env->initialize();
731
732 // add the JvmtiEnvThreadState to each JvmtiThreadState
733 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
734 state->add_env(env);
735 assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check");
736 }
737 JvmtiEventControllerPrivate::recompute_enabled();
738 }
739
740
741 void
742 JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) {
743 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
744 EC_TRACE(("JVMTI [*] # env dispose"));
745
746 // Before the environment is marked disposed, disable all events on this
747 // environment (by zapping the callbacks). As a result, the disposed
748 // environment will not call event handlers.
749 set_event_callbacks(env, NULL, 0);
750 for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL;
751 extension_event_index <= EXT_MAX_EVENT_TYPE_VAL;
752 ++extension_event_index) {
753 set_extension_event_callback(env, extension_event_index, NULL);
754 }
755
756 // Let the environment finish disposing itself.
757 env->env_dispose();
758 }
759
760
761 void
762 JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
763 jvmtiEvent event_type, bool enabled) {
764 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
765
766 EC_TRACE(("JVMTI [%s] # user %s event %s",
767 thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread),
768 enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type)));
769
770 if (thread == NULL) {
771 env->env_event_enable()->set_user_enabled(event_type, enabled);
772 } else {
773 // create the thread state (if it didn't exist before)
774 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
775 if (state != NULL) {
776 state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled);
777 }
778 }
779 recompute_enabled();
780 }
781
782
783 void
784 JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
785 EC_TRACE(("JVMTI [%s] # set frame pop - frame=%d",
786 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
787 fpop.frame_number() ));
788
789 ets->get_frame_pops()->set(fpop);
790 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
791 }
792
793
794 void
795 JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
796 EC_TRACE(("JVMTI [%s] # clear frame pop - frame=%d",
797 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
798 fpop.frame_number() ));
799
800 ets->get_frame_pops()->clear(fpop);
801 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
802 }
803
804
805 void
806 JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
807 int cleared_cnt = ets->get_frame_pops()->clear_to(fpop);
808
809 EC_TRACE(("JVMTI [%s] # clear to frame pop - frame=%d, count=%d",
810 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
811 fpop.frame_number(),
812 cleared_cnt ));
813
814 if (cleared_cnt > 0) {
815 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
816 }
817 }
818
819 void
820 JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) {
821 int *count_addr;
822
823 switch (event_type) {
824 case JVMTI_EVENT_FIELD_MODIFICATION:
825 count_addr = (int *)JvmtiExport::get_field_modification_count_addr();
826 break;
827 case JVMTI_EVENT_FIELD_ACCESS:
828 count_addr = (int *)JvmtiExport::get_field_access_count_addr();
829 break;
830 default:
831 assert(false, "incorrect event");
832 return;
833 }
834
835 EC_TRACE(("JVMTI [-] # change field watch - %s %s count=%d",
836 event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access",
837 added? "add" : "remove",
838 *count_addr));
839
840 if (added) {
841 (*count_addr)++;
842 if (*count_addr == 1) {
843 recompute_enabled();
844 }
845 } else {
846 if (*count_addr > 0) {
847 (*count_addr)--;
848 if (*count_addr == 0) {
849 recompute_enabled();
850 }
851 } else {
852 assert(false, "field watch out of phase");
853 }
854 }
855 }
856
857 void
858 JvmtiEventControllerPrivate::event_init() {
859 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
860
861 if (_initialized) {
862 return;
863 }
864
865 EC_TRACE(("JVMTI [-] # VM live"));
866
867 #ifdef ASSERT
868 // check that our idea and the spec's idea of threaded events match
869 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
870 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
871 assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei),
872 "thread filtered event list does not match");
873 }
874 #endif
875
876 _initialized = true;
877 }
878
879 void
880 JvmtiEventControllerPrivate::vm_start() {
881 // some events are now able to be enabled (phase has changed)
882 JvmtiEventControllerPrivate::recompute_enabled();
883 }
884
885
886 void
887 JvmtiEventControllerPrivate::vm_init() {
888 event_init();
889
890 // all the events are now able to be enabled (phase has changed)
891 JvmtiEventControllerPrivate::recompute_enabled();
892 }
893
894
895 void
896 JvmtiEventControllerPrivate::vm_death() {
897 // events are disabled (phase has changed)
898 JvmtiEventControllerPrivate::recompute_enabled();
899 }
900
901
902 ///////////////////////////////////////////////////////////////
903 //
904 // JvmtiEventController
905 //
906
907 JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled;
908
909 bool
910 JvmtiEventController::is_global_event(jvmtiEvent event_type) {
911 assert(is_valid_event_type(event_type), "invalid event type");
912 jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL);
913 return((bit_for & GLOBAL_EVENT_BITS)!=0);
914 }
915
916 void
917 JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) {
918 if (Threads::number_of_threads() == 0) {
919 // during early VM start-up locks don't exist, but we are safely single threaded,
920 // call the functionality without holding the JvmtiThreadState_lock.
921 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
922 } else {
923 MutexLocker mu(JvmtiThreadState_lock);
924 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
925 }
926 }
927
928
929 void
930 JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env,
931 const jvmtiEventCallbacks* callbacks,
932 jint size_of_callbacks) {
933 if (Threads::number_of_threads() == 0) {
934 // during early VM start-up locks don't exist, but we are safely single threaded,
935 // call the functionality without holding the JvmtiThreadState_lock.
936 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
937 } else {
938 MutexLocker mu(JvmtiThreadState_lock);
939 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
940 }
941 }
942
943 void
944 JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env,
945 jint extension_event_index,
946 jvmtiExtensionEvent callback) {
947 if (Threads::number_of_threads() == 0) {
948 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
949 } else {
950 MutexLocker mu(JvmtiThreadState_lock);
951 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
952 }
953 }
954
955
956
957
958 void
959 JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
960 MutexLocker mu(JvmtiThreadState_lock);
961 JvmtiEventControllerPrivate::set_frame_pop(ets, fpop);
962 }
963
964
965 void
966 JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
967 MutexLocker mu(JvmtiThreadState_lock);
968 JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop);
969 }
970
971
972 void
973 JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
974 MutexLocker mu(JvmtiThreadState_lock);
975 JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop);
976 }
977
978 void
979 JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) {
980 MutexLocker mu(JvmtiThreadState_lock);
981 JvmtiEventControllerPrivate::change_field_watch(event_type, added);
982 }
983
984 void
985 JvmtiEventController::thread_started(JavaThread *thread) {
986 // operates only on the current thread
987 // JvmtiThreadState_lock grabbed only if needed.
988 JvmtiEventControllerPrivate::thread_started(thread);
989 }
990
991 void
992 JvmtiEventController::thread_ended(JavaThread *thread) {
993 // operates only on the current thread
994 // JvmtiThreadState_lock grabbed only if needed.
995 JvmtiEventControllerPrivate::thread_ended(thread);
996 }
997
998 void
999 JvmtiEventController::env_initialize(JvmtiEnvBase *env) {
1000 if (Threads::number_of_threads() == 0) {
1001 // during early VM start-up locks don't exist, but we are safely single threaded,
1002 // call the functionality without holding the JvmtiThreadState_lock.
1003 JvmtiEventControllerPrivate::env_initialize(env);
1004 } else {
1005 MutexLocker mu(JvmtiThreadState_lock);
1006 JvmtiEventControllerPrivate::env_initialize(env);
1007 }
1008 }
1009
1010 void
1011 JvmtiEventController::env_dispose(JvmtiEnvBase *env) {
1012 if (Threads::number_of_threads() == 0) {
1013 // during early VM start-up locks don't exist, but we are safely single threaded,
1014 // call the functionality without holding the JvmtiThreadState_lock.
1015 JvmtiEventControllerPrivate::env_dispose(env);
1016 } else {
1017 MutexLocker mu(JvmtiThreadState_lock);
1018 JvmtiEventControllerPrivate::env_dispose(env);
1019 }
1020 }
1021
1022
1023 void
1024 JvmtiEventController::vm_start() {
1025 if (JvmtiEnvBase::environments_might_exist()) {
1026 MutexLocker mu(JvmtiThreadState_lock);
1027 JvmtiEventControllerPrivate::vm_start();
1028 }
1029 }
1030
1031 void
1032 JvmtiEventController::vm_init() {
1033 if (JvmtiEnvBase::environments_might_exist()) {
1034 MutexLocker mu(JvmtiThreadState_lock);
1035 JvmtiEventControllerPrivate::vm_init();
1036 }
1037 }
1038
1039 void
1040 JvmtiEventController::vm_death() {
1041 if (JvmtiEnvBase::environments_might_exist()) {
1042 MutexLocker mu(JvmtiThreadState_lock);
1043 JvmtiEventControllerPrivate::vm_death();
1044 }
1045 }