1 /*
2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "interpreter/interpreter.hpp"
27 #include "jvmtifiles/jvmtiEnv.hpp"
28 #include "memory/resourceArea.hpp"
29 #include "prims/jvmtiEventController.hpp"
30 #include "prims/jvmtiEventController.inline.hpp"
31 #include "prims/jvmtiExport.hpp"
32 #include "prims/jvmtiImpl.hpp"
33 #include "prims/jvmtiThreadState.inline.hpp"
34 #include "runtime/frame.hpp"
35 #include "runtime/thread.hpp"
36 #include "runtime/vframe.hpp"
37 #include "runtime/vframe_hp.hpp"
38 #include "runtime/vmThread.hpp"
39 #include "runtime/vm_operations.hpp"
40
41 #ifdef JVMTI_TRACE
42 #define EC_TRACE(out) if (JvmtiTrace::trace_event_controller()) { SafeResourceMark rm; tty->print_cr out; } while (0)
43 #else
44 #define EC_TRACE(out)
45 #endif /*JVMTI_TRACE */
46
47 // bits for standard events
48
49 static const jlong SINGLE_STEP_BIT = (((jlong)1) << (JVMTI_EVENT_SINGLE_STEP - TOTAL_MIN_EVENT_TYPE_VAL));
50 static const jlong FRAME_POP_BIT = (((jlong)1) << (JVMTI_EVENT_FRAME_POP - TOTAL_MIN_EVENT_TYPE_VAL));
51 static const jlong BREAKPOINT_BIT = (((jlong)1) << (JVMTI_EVENT_BREAKPOINT - TOTAL_MIN_EVENT_TYPE_VAL));
52 static const jlong FIELD_ACCESS_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_ACCESS - TOTAL_MIN_EVENT_TYPE_VAL));
53 static const jlong FIELD_MODIFICATION_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_MODIFICATION - TOTAL_MIN_EVENT_TYPE_VAL));
54 static const jlong METHOD_ENTRY_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_ENTRY - TOTAL_MIN_EVENT_TYPE_VAL));
55 static const jlong METHOD_EXIT_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_EXIT - TOTAL_MIN_EVENT_TYPE_VAL));
56 static const jlong CLASS_FILE_LOAD_HOOK_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_FILE_LOAD_HOOK - TOTAL_MIN_EVENT_TYPE_VAL));
57 static const jlong NATIVE_METHOD_BIND_BIT = (((jlong)1) << (JVMTI_EVENT_NATIVE_METHOD_BIND - TOTAL_MIN_EVENT_TYPE_VAL));
58 static const jlong VM_START_BIT = (((jlong)1) << (JVMTI_EVENT_VM_START - TOTAL_MIN_EVENT_TYPE_VAL));
59 static const jlong VM_INIT_BIT = (((jlong)1) << (JVMTI_EVENT_VM_INIT - TOTAL_MIN_EVENT_TYPE_VAL));
60 static const jlong VM_DEATH_BIT = (((jlong)1) << (JVMTI_EVENT_VM_DEATH - TOTAL_MIN_EVENT_TYPE_VAL));
61 static const jlong CLASS_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_LOAD - TOTAL_MIN_EVENT_TYPE_VAL));
62 static const jlong CLASS_PREPARE_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_PREPARE - TOTAL_MIN_EVENT_TYPE_VAL));
63 static const jlong THREAD_START_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_START - TOTAL_MIN_EVENT_TYPE_VAL));
64 static const jlong THREAD_END_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_END - TOTAL_MIN_EVENT_TYPE_VAL));
65 static const jlong EXCEPTION_THROW_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION - TOTAL_MIN_EVENT_TYPE_VAL));
66 static const jlong EXCEPTION_CATCH_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION_CATCH - TOTAL_MIN_EVENT_TYPE_VAL));
67 static const jlong MONITOR_CONTENDED_ENTER_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTER - TOTAL_MIN_EVENT_TYPE_VAL));
68 static const jlong MONITOR_CONTENDED_ENTERED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTERED - TOTAL_MIN_EVENT_TYPE_VAL));
69 static const jlong MONITOR_WAIT_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAIT - TOTAL_MIN_EVENT_TYPE_VAL));
70 static const jlong MONITOR_WAITED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAITED - TOTAL_MIN_EVENT_TYPE_VAL));
71 static const jlong DYNAMIC_CODE_GENERATED_BIT = (((jlong)1) << (JVMTI_EVENT_DYNAMIC_CODE_GENERATED - TOTAL_MIN_EVENT_TYPE_VAL));
72 static const jlong DATA_DUMP_BIT = (((jlong)1) << (JVMTI_EVENT_DATA_DUMP_REQUEST - TOTAL_MIN_EVENT_TYPE_VAL));
73 static const jlong COMPILED_METHOD_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_LOAD - TOTAL_MIN_EVENT_TYPE_VAL));
74 static const jlong COMPILED_METHOD_UNLOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
75 static const jlong GARBAGE_COLLECTION_START_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_START - TOTAL_MIN_EVENT_TYPE_VAL));
76 static const jlong GARBAGE_COLLECTION_FINISH_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_FINISH - TOTAL_MIN_EVENT_TYPE_VAL));
77 static const jlong OBJECT_FREE_BIT = (((jlong)1) << (JVMTI_EVENT_OBJECT_FREE - TOTAL_MIN_EVENT_TYPE_VAL));
78 static const jlong RESOURCE_EXHAUSTED_BIT = (((jlong)1) << (JVMTI_EVENT_RESOURCE_EXHAUSTED - TOTAL_MIN_EVENT_TYPE_VAL));
79 static const jlong VM_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_VM_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL));
80
81 // bits for extension events
82 static const jlong CLASS_UNLOAD_BIT = (((jlong)1) << (EXT_EVENT_CLASS_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
83
84
85 static const jlong MONITOR_BITS = MONITOR_CONTENDED_ENTER_BIT | MONITOR_CONTENDED_ENTERED_BIT |
86 MONITOR_WAIT_BIT | MONITOR_WAITED_BIT;
87 static const jlong EXCEPTION_BITS = EXCEPTION_THROW_BIT | EXCEPTION_CATCH_BIT;
88 static const jlong INTERP_EVENT_BITS = SINGLE_STEP_BIT | METHOD_ENTRY_BIT | METHOD_EXIT_BIT |
89 FRAME_POP_BIT | FIELD_ACCESS_BIT | FIELD_MODIFICATION_BIT;
90 static const jlong THREAD_FILTERED_EVENT_BITS = INTERP_EVENT_BITS | EXCEPTION_BITS | MONITOR_BITS |
91 BREAKPOINT_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | THREAD_END_BIT;
92 static const jlong NEED_THREAD_LIFE_EVENTS = THREAD_FILTERED_EVENT_BITS | THREAD_START_BIT;
93 static const jlong EARLY_EVENT_BITS = CLASS_FILE_LOAD_HOOK_BIT |
94 VM_START_BIT | VM_INIT_BIT | VM_DEATH_BIT | NATIVE_METHOD_BIND_BIT |
95 THREAD_START_BIT | THREAD_END_BIT |
96 DYNAMIC_CODE_GENERATED_BIT;
97 static const jlong GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS;
98 static const jlong SHOULD_POST_ON_EXCEPTIONS_BITS = EXCEPTION_BITS | METHOD_EXIT_BIT | FRAME_POP_BIT;
99
100 ///////////////////////////////////////////////////////////////
101 //
102 // JvmtiEventEnabled
103 //
104
105 JvmtiEventEnabled::JvmtiEventEnabled() {
106 clear();
107 }
108
109
110 void JvmtiEventEnabled::clear() {
111 _enabled_bits = 0;
112 #ifndef PRODUCT
113 _init_guard = JEE_INIT_GUARD;
114 #endif
115 }
116
117 void JvmtiEventEnabled::set_enabled(jvmtiEvent event_type, bool enabled) {
118 jlong bits = get_bits();
119 jlong mask = bit_for(event_type);
120 if (enabled) {
121 bits |= mask;
122 } else {
123 bits &= ~mask;
124 }
125 set_bits(bits);
126 }
127
128
129 ///////////////////////////////////////////////////////////////
130 //
131 // JvmtiEnvThreadEventEnable
132 //
133
134 JvmtiEnvThreadEventEnable::JvmtiEnvThreadEventEnable() {
135 _event_user_enabled.clear();
136 _event_enabled.clear();
137 }
138
139
140 JvmtiEnvThreadEventEnable::~JvmtiEnvThreadEventEnable() {
141 _event_user_enabled.clear();
142 _event_enabled.clear();
143 }
144
145
146 ///////////////////////////////////////////////////////////////
147 //
148 // JvmtiThreadEventEnable
149 //
150
151 JvmtiThreadEventEnable::JvmtiThreadEventEnable() {
152 _event_enabled.clear();
153 }
154
155
156 JvmtiThreadEventEnable::~JvmtiThreadEventEnable() {
157 _event_enabled.clear();
158 }
159
160
161 ///////////////////////////////////////////////////////////////
162 //
163 // JvmtiEnvEventEnable
164 //
165
166 JvmtiEnvEventEnable::JvmtiEnvEventEnable() {
167 _event_user_enabled.clear();
168 _event_callback_enabled.clear();
169 _event_enabled.clear();
170 }
171
172
173 JvmtiEnvEventEnable::~JvmtiEnvEventEnable() {
174 _event_user_enabled.clear();
175 _event_callback_enabled.clear();
176 _event_enabled.clear();
177 }
178
179
180 ///////////////////////////////////////////////////////////////
181 //
182 // VM_EnterInterpOnlyMode
183 //
184
185 class VM_EnterInterpOnlyMode : public VM_Operation {
186 private:
187 JvmtiThreadState *_state;
188
189 public:
190 VM_EnterInterpOnlyMode(JvmtiThreadState *state);
191
192 bool allow_nested_vm_operations() const { return true; }
193 VMOp_Type type() const { return VMOp_EnterInterpOnlyMode; }
194 void doit();
195
196 // to do: this same function is in jvmtiImpl - should be in one place
197 bool can_be_deoptimized(vframe* vf) {
198 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized());
199 }
200 };
201
202 VM_EnterInterpOnlyMode::VM_EnterInterpOnlyMode(JvmtiThreadState *state)
203 : _state(state)
204 {
205 }
206
207
208 void VM_EnterInterpOnlyMode::doit() {
209 // Set up the current stack depth for later tracking
210 _state->invalidate_cur_stack_depth();
211
212 _state->enter_interp_only_mode();
213
214 JavaThread *thread = _state->get_thread();
215 if (thread->has_last_Java_frame()) {
216 // If running in fullspeed mode, single stepping is implemented
217 // as follows: first, the interpreter does not dispatch to
218 // compiled code for threads that have single stepping enabled;
219 // second, we deoptimize all methods on the thread's stack when
220 // interpreted-only mode is enabled the first time for a given
221 // thread (nothing to do if no Java frames yet).
222 int num_marked = 0;
223 ResourceMark resMark;
224 RegisterMap rm(thread, false);
225 for (vframe* vf = thread->last_java_vframe(&rm); vf; vf = vf->sender()) {
226 if (can_be_deoptimized(vf)) {
227 ((compiledVFrame*) vf)->code()->mark_for_deoptimization();
228 ++num_marked;
229 }
230 }
231 if (num_marked > 0) {
232 VM_Deoptimize op;
233 VMThread::execute(&op);
234 }
235 }
236 }
237
238
239 ///////////////////////////////////////////////////////////////
240 //
241 // VM_ChangeSingleStep
242 //
243
244 class VM_ChangeSingleStep : public VM_Operation {
245 private:
246 bool _on;
247
248 public:
249 VM_ChangeSingleStep(bool on);
250 VMOp_Type type() const { return VMOp_ChangeSingleStep; }
251 bool allow_nested_vm_operations() const { return true; }
252 void doit(); // method definition is after definition of JvmtiEventControllerPrivate because of scoping
253 };
254
255
256 VM_ChangeSingleStep::VM_ChangeSingleStep(bool on)
257 : _on(on != 0)
258 {
259 }
260
261
262
263
264 ///////////////////////////////////////////////////////////////
265 //
266 // JvmtiEventControllerPrivate
267 //
268 // Private internal implementation methods for JvmtiEventController.
269 //
270 // These methods are thread safe either because they are called
271 // in early VM initialization which is single threaded, or they
272 // hold the JvmtiThreadState_lock.
273 //
274
275 class JvmtiEventControllerPrivate : public AllStatic {
276 static bool _initialized;
277 public:
278 static void set_should_post_single_step(bool on);
279 static void enter_interp_only_mode(JvmtiThreadState *state);
280 static void leave_interp_only_mode(JvmtiThreadState *state);
281 static void recompute_enabled();
282 static jlong recompute_env_enabled(JvmtiEnvBase* env);
283 static jlong recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state);
284 static jlong recompute_thread_enabled(JvmtiThreadState *state);
285 static void event_init();
286
287 static void set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
288 jvmtiEvent event_type, bool enabled);
289 static void set_event_callbacks(JvmtiEnvBase *env,
290 const jvmtiEventCallbacks* callbacks,
291 jint size_of_callbacks);
292
293 static void set_extension_event_callback(JvmtiEnvBase *env,
294 jint extension_event_index,
295 jvmtiExtensionEvent callback);
296
297 static void set_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
298 static void clear_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
299 static void clear_to_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
300 static void change_field_watch(jvmtiEvent event_type, bool added);
301
302 static void thread_started(JavaThread *thread);
303 static void thread_ended(JavaThread *thread);
304
305 static void env_initialize(JvmtiEnvBase *env);
306 static void env_dispose(JvmtiEnvBase *env);
307
308 static void vm_start();
309 static void vm_init();
310 static void vm_death();
311
312 static void trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed);
313 static void trace_changed(jlong now_enabled, jlong changed);
314 };
315
316 bool JvmtiEventControllerPrivate::_initialized = false;
317
318 void JvmtiEventControllerPrivate::set_should_post_single_step(bool on) {
319 // we have permission to do this, VM op doesn't
320 JvmtiExport::set_should_post_single_step(on);
321 }
322
323
324 // This change must always be occur when at a safepoint.
325 // Being at a safepoint causes the interpreter to use the
326 // safepoint dispatch table which we overload to find single
327 // step points. Just to be sure that it has been set, we
328 // call notice_safepoints when turning on single stepping.
329 // When we leave our current safepoint, should_post_single_step
330 // will be checked by the interpreter, and the table kept
331 // or changed accordingly.
332 void VM_ChangeSingleStep::doit() {
333 JvmtiEventControllerPrivate::set_should_post_single_step(_on);
334 if (_on) {
335 Interpreter::notice_safepoints();
336 }
337 }
338
339
340 void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) {
341 EC_TRACE(("JVMTI [%s] # Entering interpreter only mode",
342 JvmtiTrace::safe_get_thread_name(state->get_thread())));
343
344 VM_EnterInterpOnlyMode op(state);
345 VMThread::execute(&op);
346 }
347
348
349 void
350 JvmtiEventControllerPrivate::leave_interp_only_mode(JvmtiThreadState *state) {
351 EC_TRACE(("JVMTI [%s] # Leaving interpreter only mode",
352 JvmtiTrace::safe_get_thread_name(state->get_thread())));
353 state->leave_interp_only_mode();
354 }
355
356
357 void
358 JvmtiEventControllerPrivate::trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed) {
359 #ifdef JVMTI_TRACE
360 if (JvmtiTrace::trace_event_controller()) {
361 SafeResourceMark rm;
362 // traces standard events only
363 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
364 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
365 if (changed & bit) {
366 // it changed, print it
367 tty->print_cr("JVMTI [%s] # %s event %s",
368 JvmtiTrace::safe_get_thread_name(state->get_thread()),
369 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
370 }
371 }
372 }
373 #endif /*JVMTI_TRACE */
374 }
375
376
377 void
378 JvmtiEventControllerPrivate::trace_changed(jlong now_enabled, jlong changed) {
379 #ifdef JVMTI_TRACE
380 if (JvmtiTrace::trace_event_controller()) {
381 SafeResourceMark rm;
382 // traces standard events only
383 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
384 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
385 if (changed & bit) {
386 // it changed, print it
387 tty->print_cr("JVMTI [-] # %s event %s",
388 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
389 }
390 }
391 }
392 #endif /*JVMTI_TRACE */
393 }
394
395
396 // For the specified env: compute the currently truly enabled events
397 // set external state accordingly.
398 // Return value and set value must include all events.
399 // But outside this class, only non-thread-filtered events can be queried..
400 jlong
401 JvmtiEventControllerPrivate::recompute_env_enabled(JvmtiEnvBase* env) {
402 jlong was_enabled = env->env_event_enable()->_event_enabled.get_bits();
403 jlong now_enabled =
404 env->env_event_enable()->_event_callback_enabled.get_bits() &
405 env->env_event_enable()->_event_user_enabled.get_bits();
406
407 switch (JvmtiEnv::get_phase()) {
408 case JVMTI_PHASE_PRIMORDIAL:
409 case JVMTI_PHASE_ONLOAD:
410 // only these events allowed in primordial or onload phase
411 now_enabled &= (EARLY_EVENT_BITS & ~THREAD_FILTERED_EVENT_BITS);
412 break;
413 case JVMTI_PHASE_START:
414 // only these events allowed in start phase
415 now_enabled &= EARLY_EVENT_BITS;
416 break;
417 case JVMTI_PHASE_LIVE:
418 // all events allowed during live phase
419 break;
420 case JVMTI_PHASE_DEAD:
421 // no events allowed when dead
422 now_enabled = 0;
423 break;
424 default:
425 assert(false, "no other phases - sanity check");
426 break;
427 }
428
429 // will we really send these events to this env
430 env->env_event_enable()->_event_enabled.set_bits(now_enabled);
431
432 trace_changed(now_enabled, (now_enabled ^ was_enabled) & ~THREAD_FILTERED_EVENT_BITS);
433
434 return now_enabled;
435 }
436
437
438 // For the specified env and thread: compute the currently truly enabled events
439 // set external state accordingly. Only thread-filtered events are included.
440 jlong
441 JvmtiEventControllerPrivate::recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state) {
442 JvmtiEnv *env = ets->get_env();
443
444 jlong was_enabled = ets->event_enable()->_event_enabled.get_bits();
445 jlong now_enabled = THREAD_FILTERED_EVENT_BITS &
446 env->env_event_enable()->_event_callback_enabled.get_bits() &
447 (env->env_event_enable()->_event_user_enabled.get_bits() |
448 ets->event_enable()->_event_user_enabled.get_bits());
449
450 // for frame pops and field watchs, computed enabled state
451 // is only true if an event has been requested
452 if (!ets->has_frame_pops()) {
453 now_enabled &= ~FRAME_POP_BIT;
454 }
455 if (*((int *)JvmtiExport::get_field_access_count_addr()) == 0) {
456 now_enabled &= ~FIELD_ACCESS_BIT;
457 }
458 if (*((int *)JvmtiExport::get_field_modification_count_addr()) == 0) {
459 now_enabled &= ~FIELD_MODIFICATION_BIT;
460 }
461
462 switch (JvmtiEnv::get_phase()) {
463 case JVMTI_PHASE_DEAD:
464 // no events allowed when dead
465 now_enabled = 0;
466 break;
467 }
468
469 // if anything changed do update
470 if (now_enabled != was_enabled) {
471
472 // will we really send these events to this thread x env
473 ets->event_enable()->_event_enabled.set_bits(now_enabled);
474
475 // If the enabled status of the single step or breakpoint events changed,
476 // the location status may need to change as well.
477 jlong changed = now_enabled ^ was_enabled;
478 if (changed & SINGLE_STEP_BIT) {
479 ets->reset_current_location(JVMTI_EVENT_SINGLE_STEP, (now_enabled & SINGLE_STEP_BIT) != 0);
480 }
481 if (changed & BREAKPOINT_BIT) {
482 ets->reset_current_location(JVMTI_EVENT_BREAKPOINT, (now_enabled & BREAKPOINT_BIT) != 0);
483 }
484 trace_changed(state, now_enabled, changed);
485 }
486 return now_enabled;
487 }
488
489
490 // For the specified thread: compute the currently truly enabled events
491 // set external state accordingly. Only thread-filtered events are included.
492 jlong
493 JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) {
494 if (state == NULL) {
495 // associated JavaThread is exiting
496 return (jlong)0;
497 }
498
499 jlong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits();
500 jlong any_env_enabled = 0;
501
502 {
503 // This iteration will include JvmtiEnvThreadStates whoses environments
504 // have been disposed. These JvmtiEnvThreadStates must not be filtered
505 // as recompute must be called on them to disable their events,
506 JvmtiEnvThreadStateIterator it(state);
507 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
508 any_env_enabled |= recompute_env_thread_enabled(ets, state);
509 }
510 }
511
512 if (any_env_enabled != was_any_env_enabled) {
513 // mark if event is truly enabled on this thread in any environment
514 state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled);
515
516 // compute interp_only mode
517 bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0;
518 bool is_now_interp = state->is_interp_only_mode();
519
520 if (should_be_interp != is_now_interp) {
521 if (should_be_interp) {
522 enter_interp_only_mode(state);
523 } else {
524 leave_interp_only_mode(state);
525 }
526 }
527
528 // update the JavaThread cached value for thread-specific should_post_on_exceptions value
529 bool should_post_on_exceptions = (any_env_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0;
530 state->set_should_post_on_exceptions(should_post_on_exceptions);
531 }
532
533 return any_env_enabled;
534 }
535
536
537 // Compute truly enabled events - meaning if the event can and could be
538 // sent. An event is truly enabled if it is user enabled on the thread
539 // or globally user enabled, but only if there is a callback or event hook
540 // for it and, for field watch and frame pop, one has been set.
541 // Compute if truly enabled, per thread, per environment, per combination
542 // (thread x environment), and overall. These merges are true if any is true.
543 // True per thread if some environment has callback set and the event is globally
544 // enabled or enabled for this thread.
545 // True per environment if the callback is set and the event is globally
546 // enabled in this environment or enabled for any thread in this environment.
547 // True per combination if the environment has the callback set and the
548 // event is globally enabled in this environment or the event is enabled
549 // for this thread and environment.
550 //
551 // All states transitions dependent on these transitions are also handled here.
552 void
553 JvmtiEventControllerPrivate::recompute_enabled() {
554 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
555
556 // event enabled for any thread in any environment
557 jlong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits();
558 jlong any_env_thread_enabled = 0;
559
560 EC_TRACE(("JVMTI [-] # recompute enabled - before %llx", was_any_env_thread_enabled));
561
562 // compute non-thread-filters events.
563 // This must be done separately from thread-filtered events, since some
564 // events can occur before any threads exist.
565 JvmtiEnvIterator it;
566 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
567 any_env_thread_enabled |= recompute_env_enabled(env);
568 }
569
570 // We need to create any missing jvmti_thread_state if there are globally set thread
571 // filtered events and there weren't last time
572 if ( (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 &&
573 (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) {
574 assert(JvmtiEnv::is_vm_live() || (JvmtiEnv::get_phase()==JVMTI_PHASE_START),
575 "thread filtered events should not be enabled when VM not in start or live phase");
576 {
577 MutexLocker mu(Threads_lock); //hold the Threads_lock for the iteration
578 for (JavaThread *tp = Threads::first(); tp != NULL; tp = tp->next()) {
579 // state_for_while_locked() makes tp->is_exiting() check
580 JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing
581 }
582 }// release Threads_lock
583 }
584
585 // compute and set thread-filtered events
586 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
587 any_env_thread_enabled |= recompute_thread_enabled(state);
588 }
589
590 // set universal state (across all envs and threads)
591 jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled;
592 if (delta != 0) {
593 JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0);
594 JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0);
595 JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0);
596 JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0);
597 JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0);
598 JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0);
599 JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0);
600 JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0);
601 JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0);
602 JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0);
603 JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0);
604 JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0);
605 JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0);
606 JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0);
607 JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0);
608 JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0);
609 JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0);
610 JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0);
611 JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0);
612 JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0);
613
614 // need this if we want thread events or we need them to init data
615 JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0);
616
617 // If single stepping is turned on or off, execute the VM op to change it.
618 if (delta & SINGLE_STEP_BIT) {
619 switch (JvmtiEnv::get_phase()) {
620 case JVMTI_PHASE_DEAD:
621 // If the VM is dying we can't execute VM ops
622 break;
623 case JVMTI_PHASE_LIVE: {
624 VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0);
625 VMThread::execute(&op);
626 break;
627 }
628 default:
629 assert(false, "should never come here before live phase");
630 break;
631 }
632 }
633
634 // set global truly enabled, that is, any thread in any environment
635 JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled);
636
637 // set global should_post_on_exceptions
638 JvmtiExport::set_should_post_on_exceptions((any_env_thread_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0);
639
640 }
641
642 EC_TRACE(("JVMTI [-] # recompute enabled - after %llx", any_env_thread_enabled));
643 }
644
645
646 void
647 JvmtiEventControllerPrivate::thread_started(JavaThread *thread) {
648 assert(thread->is_Java_thread(), "Must be JavaThread");
649 assert(thread == Thread::current(), "must be current thread");
650 assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist");
651
652 EC_TRACE(("JVMTI [%s] # thread started", JvmtiTrace::safe_get_thread_name(thread)));
653
654 // if we have any thread filtered events globally enabled, create/update the thread state
655 if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) {
656 MutexLocker mu(JvmtiThreadState_lock);
657 // create the thread state if missing
658 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
659 if (state != NULL) { // skip threads with no JVMTI thread state
660 recompute_thread_enabled(state);
661 }
662 }
663 }
664
665
666 void
667 JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) {
668 // Removes the JvmtiThreadState associated with the specified thread.
669 // May be called after all environments have been disposed.
670 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
671
672 EC_TRACE(("JVMTI [%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread)));
673
674 JvmtiThreadState *state = thread->jvmti_thread_state();
675 assert(state != NULL, "else why are we here?");
676 delete state;
677 }
678
679 void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env,
680 const jvmtiEventCallbacks* callbacks,
681 jint size_of_callbacks) {
682 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
683 EC_TRACE(("JVMTI [*] # set event callbacks"));
684
685 env->set_event_callbacks(callbacks, size_of_callbacks);
686 jlong enabled_bits = 0;
687 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
688 jvmtiEvent evt_t = (jvmtiEvent)ei;
689 if (env->has_callback(evt_t)) {
690 enabled_bits |= JvmtiEventEnabled::bit_for(evt_t);
691 }
692 }
693 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
694 recompute_enabled();
695 }
696
697 void
698 JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env,
699 jint extension_event_index,
700 jvmtiExtensionEvent callback)
701 {
702 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
703 EC_TRACE(("JVMTI [*] # set extension event callback"));
704
705 // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL
706 assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL &&
707 extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check");
708
709
710 // As the bits for both standard (jvmtiEvent) and extension
711 // (jvmtiExtEvents) are stored in the same word we cast here to
712 // jvmtiEvent to set/clear the bit for this extension event.
713 jvmtiEvent event_type = (jvmtiEvent)extension_event_index;
714
715 // Prevent a possible race condition where events are re-enabled by a call to
716 // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate
717 // environment check and before the lock is acquired.
718 // We can safely do the is_valid check now, as JvmtiThreadState_lock is held.
719 bool enabling = (callback != NULL) && (env->is_valid());
720 env->env_event_enable()->set_user_enabled(event_type, enabling);
721
722 // update the callback
723 jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks();
724 switch (extension_event_index) {
725 case EXT_EVENT_CLASS_UNLOAD :
726 ext_callbacks->ClassUnload = callback;
727 break;
728 default:
729 ShouldNotReachHere();
730 }
731
732 // update the callback enable/disable bit
733 jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits();
734 jlong bit_for = JvmtiEventEnabled::bit_for(event_type);
735 if (enabling) {
736 enabled_bits |= bit_for;
737 } else {
738 enabled_bits &= ~bit_for;
739 }
740 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
741
742 recompute_enabled();
743 }
744
745
746 void
747 JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) {
748 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
749 EC_TRACE(("JVMTI [*] # env initialize"));
750
751 if (JvmtiEnvBase::is_vm_live()) {
752 // if we didn't initialize event info already (this is a late
753 // launched environment), do it now.
754 event_init();
755 }
756
757 env->initialize();
758
759 // add the JvmtiEnvThreadState to each JvmtiThreadState
760 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
761 state->add_env(env);
762 assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check");
763 }
764 JvmtiEventControllerPrivate::recompute_enabled();
765 }
766
767
768 void
769 JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) {
770 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
771 EC_TRACE(("JVMTI [*] # env dispose"));
772
773 // Before the environment is marked disposed, disable all events on this
774 // environment (by zapping the callbacks). As a result, the disposed
775 // environment will not call event handlers.
776 set_event_callbacks(env, NULL, 0);
777 for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL;
778 extension_event_index <= EXT_MAX_EVENT_TYPE_VAL;
779 ++extension_event_index) {
780 set_extension_event_callback(env, extension_event_index, NULL);
781 }
782
783 // Let the environment finish disposing itself.
784 env->env_dispose();
785 }
786
787
788 void
789 JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
790 jvmtiEvent event_type, bool enabled) {
791 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
792
793 EC_TRACE(("JVMTI [%s] # user %s event %s",
794 thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread),
795 enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type)));
796
797 if (thread == NULL) {
798 env->env_event_enable()->set_user_enabled(event_type, enabled);
799 } else {
800 // create the thread state (if it didn't exist before)
801 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
802 if (state != NULL) {
803 state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled);
804 }
805 }
806 recompute_enabled();
807 }
808
809
810 void
811 JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
812 EC_TRACE(("JVMTI [%s] # set frame pop - frame=%d",
813 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
814 fpop.frame_number() ));
815
816 ets->get_frame_pops()->set(fpop);
817 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
818 }
819
820
821 void
822 JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
823 EC_TRACE(("JVMTI [%s] # clear frame pop - frame=%d",
824 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
825 fpop.frame_number() ));
826
827 ets->get_frame_pops()->clear(fpop);
828 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
829 }
830
831
832 void
833 JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
834 int cleared_cnt = ets->get_frame_pops()->clear_to(fpop);
835
836 EC_TRACE(("JVMTI [%s] # clear to frame pop - frame=%d, count=%d",
837 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
838 fpop.frame_number(),
839 cleared_cnt ));
840
841 if (cleared_cnt > 0) {
842 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
843 }
844 }
845
846 void
847 JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) {
848 int *count_addr;
849
850 switch (event_type) {
851 case JVMTI_EVENT_FIELD_MODIFICATION:
852 count_addr = (int *)JvmtiExport::get_field_modification_count_addr();
853 break;
854 case JVMTI_EVENT_FIELD_ACCESS:
855 count_addr = (int *)JvmtiExport::get_field_access_count_addr();
856 break;
857 default:
858 assert(false, "incorrect event");
859 return;
860 }
861
862 EC_TRACE(("JVMTI [-] # change field watch - %s %s count=%d",
863 event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access",
864 added? "add" : "remove",
865 *count_addr));
866
867 if (added) {
868 (*count_addr)++;
869 if (*count_addr == 1) {
870 recompute_enabled();
871 }
872 } else {
873 if (*count_addr > 0) {
874 (*count_addr)--;
875 if (*count_addr == 0) {
876 recompute_enabled();
877 }
878 } else {
879 assert(false, "field watch out of phase");
880 }
881 }
882 }
883
884 void
885 JvmtiEventControllerPrivate::event_init() {
886 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
887
888 if (_initialized) {
889 return;
890 }
891
892 EC_TRACE(("JVMTI [-] # VM live"));
893
894 #ifdef ASSERT
895 // check that our idea and the spec's idea of threaded events match
896 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
897 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
898 assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei),
899 "thread filtered event list does not match");
900 }
901 #endif
902
903 _initialized = true;
904 }
905
906 void
907 JvmtiEventControllerPrivate::vm_start() {
908 // some events are now able to be enabled (phase has changed)
909 JvmtiEventControllerPrivate::recompute_enabled();
910 }
911
912
913 void
914 JvmtiEventControllerPrivate::vm_init() {
915 event_init();
916
917 // all the events are now able to be enabled (phase has changed)
918 JvmtiEventControllerPrivate::recompute_enabled();
919 }
920
921
922 void
923 JvmtiEventControllerPrivate::vm_death() {
924 // events are disabled (phase has changed)
925 JvmtiEventControllerPrivate::recompute_enabled();
926 }
927
928
929 ///////////////////////////////////////////////////////////////
930 //
931 // JvmtiEventController
932 //
933
934 JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled;
935
936 bool
937 JvmtiEventController::is_global_event(jvmtiEvent event_type) {
938 assert(is_valid_event_type(event_type), "invalid event type");
939 jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL);
940 return((bit_for & GLOBAL_EVENT_BITS)!=0);
941 }
942
943 void
944 JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) {
945 if (Threads::number_of_threads() == 0) {
946 // during early VM start-up locks don't exist, but we are safely single threaded,
947 // call the functionality without holding the JvmtiThreadState_lock.
948 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
949 } else {
950 MutexLocker mu(JvmtiThreadState_lock);
951 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
952 }
953 }
954
955
956 void
957 JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env,
958 const jvmtiEventCallbacks* callbacks,
959 jint size_of_callbacks) {
960 if (Threads::number_of_threads() == 0) {
961 // during early VM start-up locks don't exist, but we are safely single threaded,
962 // call the functionality without holding the JvmtiThreadState_lock.
963 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
964 } else {
965 MutexLocker mu(JvmtiThreadState_lock);
966 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
967 }
968 }
969
970 void
971 JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env,
972 jint extension_event_index,
973 jvmtiExtensionEvent callback) {
974 if (Threads::number_of_threads() == 0) {
975 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
976 } else {
977 MutexLocker mu(JvmtiThreadState_lock);
978 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
979 }
980 }
981
982
983
984
985 void
986 JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
987 MutexLocker mu(JvmtiThreadState_lock);
988 JvmtiEventControllerPrivate::set_frame_pop(ets, fpop);
989 }
990
991
992 void
993 JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
994 MutexLocker mu(JvmtiThreadState_lock);
995 JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop);
996 }
997
998
999 void
1000 JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1001 MutexLocker mu(JvmtiThreadState_lock);
1002 JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop);
1003 }
1004
1005 void
1006 JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) {
1007 MutexLocker mu(JvmtiThreadState_lock);
1008 JvmtiEventControllerPrivate::change_field_watch(event_type, added);
1009 }
1010
1011 void
1012 JvmtiEventController::thread_started(JavaThread *thread) {
1013 // operates only on the current thread
1014 // JvmtiThreadState_lock grabbed only if needed.
1015 JvmtiEventControllerPrivate::thread_started(thread);
1016 }
1017
1018 void
1019 JvmtiEventController::thread_ended(JavaThread *thread) {
1020 // operates only on the current thread
1021 // JvmtiThreadState_lock grabbed only if needed.
1022 JvmtiEventControllerPrivate::thread_ended(thread);
1023 }
1024
1025 void
1026 JvmtiEventController::env_initialize(JvmtiEnvBase *env) {
1027 if (Threads::number_of_threads() == 0) {
1028 // during early VM start-up locks don't exist, but we are safely single threaded,
1029 // call the functionality without holding the JvmtiThreadState_lock.
1030 JvmtiEventControllerPrivate::env_initialize(env);
1031 } else {
1032 MutexLocker mu(JvmtiThreadState_lock);
1033 JvmtiEventControllerPrivate::env_initialize(env);
1034 }
1035 }
1036
1037 void
1038 JvmtiEventController::env_dispose(JvmtiEnvBase *env) {
1039 if (Threads::number_of_threads() == 0) {
1040 // during early VM start-up locks don't exist, but we are safely single threaded,
1041 // call the functionality without holding the JvmtiThreadState_lock.
1042 JvmtiEventControllerPrivate::env_dispose(env);
1043 } else {
1044 MutexLocker mu(JvmtiThreadState_lock);
1045 JvmtiEventControllerPrivate::env_dispose(env);
1046 }
1047 }
1048
1049
1050 void
1051 JvmtiEventController::vm_start() {
1052 if (JvmtiEnvBase::environments_might_exist()) {
1053 MutexLocker mu(JvmtiThreadState_lock);
1054 JvmtiEventControllerPrivate::vm_start();
1055 }
1056 }
1057
1058 void
1059 JvmtiEventController::vm_init() {
1060 if (JvmtiEnvBase::environments_might_exist()) {
1061 MutexLocker mu(JvmtiThreadState_lock);
1062 JvmtiEventControllerPrivate::vm_init();
1063 }
1064 }
1065
1066 void
1067 JvmtiEventController::vm_death() {
1068 if (JvmtiEnvBase::environments_might_exist()) {
1069 MutexLocker mu(JvmtiThreadState_lock);
1070 JvmtiEventControllerPrivate::vm_death();
1071 }
1072 }