1 /*
2 * Copyright (c) 2003, 2017, 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 "logging/log.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "prims/jvmtiEventController.hpp"
31 #include "prims/jvmtiEventController.inline.hpp"
32 #include "prims/jvmtiExport.hpp"
33 #include "prims/jvmtiImpl.hpp"
34 #include "prims/jvmtiThreadState.inline.hpp"
35 #include "runtime/frame.hpp"
36 #include "runtime/thread.inline.hpp"
37 #include "runtime/threadSMR.hpp"
38 #include "runtime/vframe.hpp"
39 #include "runtime/vframe_hp.hpp"
40 #include "runtime/vmThread.hpp"
41 #include "runtime/vm_operations.hpp"
42
43 #ifdef JVMTI_TRACE
44 #define EC_TRACE(out) do { \
45 if (JvmtiTrace::trace_event_controller()) { \
46 SafeResourceMark rm; \
47 log_trace(jvmti) out; \
48 } \
49 } while (0)
50 #else
51 #define EC_TRACE(out)
52 #endif /*JVMTI_TRACE */
53
54 // bits for standard events
55
56 static const jlong SINGLE_STEP_BIT = (((jlong)1) << (JVMTI_EVENT_SINGLE_STEP - TOTAL_MIN_EVENT_TYPE_VAL));
57 static const jlong FRAME_POP_BIT = (((jlong)1) << (JVMTI_EVENT_FRAME_POP - TOTAL_MIN_EVENT_TYPE_VAL));
58 static const jlong BREAKPOINT_BIT = (((jlong)1) << (JVMTI_EVENT_BREAKPOINT - TOTAL_MIN_EVENT_TYPE_VAL));
59 static const jlong FIELD_ACCESS_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_ACCESS - TOTAL_MIN_EVENT_TYPE_VAL));
60 static const jlong FIELD_MODIFICATION_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_MODIFICATION - TOTAL_MIN_EVENT_TYPE_VAL));
61 static const jlong METHOD_ENTRY_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_ENTRY - TOTAL_MIN_EVENT_TYPE_VAL));
62 static const jlong METHOD_EXIT_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_EXIT - TOTAL_MIN_EVENT_TYPE_VAL));
63 static const jlong CLASS_FILE_LOAD_HOOK_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_FILE_LOAD_HOOK - TOTAL_MIN_EVENT_TYPE_VAL));
64 static const jlong NATIVE_METHOD_BIND_BIT = (((jlong)1) << (JVMTI_EVENT_NATIVE_METHOD_BIND - TOTAL_MIN_EVENT_TYPE_VAL));
65 static const jlong VM_START_BIT = (((jlong)1) << (JVMTI_EVENT_VM_START - TOTAL_MIN_EVENT_TYPE_VAL));
66 static const jlong VM_INIT_BIT = (((jlong)1) << (JVMTI_EVENT_VM_INIT - TOTAL_MIN_EVENT_TYPE_VAL));
67 static const jlong VM_DEATH_BIT = (((jlong)1) << (JVMTI_EVENT_VM_DEATH - TOTAL_MIN_EVENT_TYPE_VAL));
68 static const jlong CLASS_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_LOAD - TOTAL_MIN_EVENT_TYPE_VAL));
69 static const jlong CLASS_PREPARE_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_PREPARE - TOTAL_MIN_EVENT_TYPE_VAL));
70 static const jlong THREAD_START_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_START - TOTAL_MIN_EVENT_TYPE_VAL));
71 static const jlong THREAD_END_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_END - TOTAL_MIN_EVENT_TYPE_VAL));
72 static const jlong EXCEPTION_THROW_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION - TOTAL_MIN_EVENT_TYPE_VAL));
73 static const jlong EXCEPTION_CATCH_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION_CATCH - TOTAL_MIN_EVENT_TYPE_VAL));
74 static const jlong MONITOR_CONTENDED_ENTER_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTER - TOTAL_MIN_EVENT_TYPE_VAL));
75 static const jlong MONITOR_CONTENDED_ENTERED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTERED - TOTAL_MIN_EVENT_TYPE_VAL));
76 static const jlong MONITOR_WAIT_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAIT - TOTAL_MIN_EVENT_TYPE_VAL));
77 static const jlong MONITOR_WAITED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAITED - TOTAL_MIN_EVENT_TYPE_VAL));
78 static const jlong DYNAMIC_CODE_GENERATED_BIT = (((jlong)1) << (JVMTI_EVENT_DYNAMIC_CODE_GENERATED - TOTAL_MIN_EVENT_TYPE_VAL));
79 static const jlong DATA_DUMP_BIT = (((jlong)1) << (JVMTI_EVENT_DATA_DUMP_REQUEST - TOTAL_MIN_EVENT_TYPE_VAL));
80 static const jlong COMPILED_METHOD_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_LOAD - TOTAL_MIN_EVENT_TYPE_VAL));
81 static const jlong COMPILED_METHOD_UNLOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
82 static const jlong GARBAGE_COLLECTION_START_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_START - TOTAL_MIN_EVENT_TYPE_VAL));
83 static const jlong GARBAGE_COLLECTION_FINISH_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_FINISH - TOTAL_MIN_EVENT_TYPE_VAL));
84 static const jlong OBJECT_FREE_BIT = (((jlong)1) << (JVMTI_EVENT_OBJECT_FREE - TOTAL_MIN_EVENT_TYPE_VAL));
85 static const jlong RESOURCE_EXHAUSTED_BIT = (((jlong)1) << (JVMTI_EVENT_RESOURCE_EXHAUSTED - TOTAL_MIN_EVENT_TYPE_VAL));
86 static const jlong VM_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_VM_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL));
87 static const jlong SAMPLED_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_SAMPLED_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL));
88
89 // bits for extension events
90 static const jlong CLASS_UNLOAD_BIT = (((jlong)1) << (EXT_EVENT_CLASS_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
91
92
93 static const jlong MONITOR_BITS = MONITOR_CONTENDED_ENTER_BIT | MONITOR_CONTENDED_ENTERED_BIT |
94 MONITOR_WAIT_BIT | MONITOR_WAITED_BIT;
95 static const jlong EXCEPTION_BITS = EXCEPTION_THROW_BIT | EXCEPTION_CATCH_BIT;
96 static const jlong INTERP_EVENT_BITS = SINGLE_STEP_BIT | METHOD_ENTRY_BIT | METHOD_EXIT_BIT |
97 FRAME_POP_BIT | FIELD_ACCESS_BIT | FIELD_MODIFICATION_BIT;
98 static const jlong THREAD_FILTERED_EVENT_BITS = INTERP_EVENT_BITS | EXCEPTION_BITS | MONITOR_BITS |
99 BREAKPOINT_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | THREAD_END_BIT;
100 static const jlong NEED_THREAD_LIFE_EVENTS = THREAD_FILTERED_EVENT_BITS | THREAD_START_BIT;
101 static const jlong EARLY_EVENT_BITS = CLASS_FILE_LOAD_HOOK_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT |
102 VM_START_BIT | VM_INIT_BIT | VM_DEATH_BIT | NATIVE_METHOD_BIND_BIT |
103 THREAD_START_BIT | THREAD_END_BIT |
104 COMPILED_METHOD_LOAD_BIT | COMPILED_METHOD_UNLOAD_BIT |
105 DYNAMIC_CODE_GENERATED_BIT;
106 static const jlong GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS;
107 static const jlong SHOULD_POST_ON_EXCEPTIONS_BITS = EXCEPTION_BITS | METHOD_EXIT_BIT | FRAME_POP_BIT;
108
109 ///////////////////////////////////////////////////////////////
110 //
111 // JvmtiEventEnabled
112 //
113
114 JvmtiEventEnabled::JvmtiEventEnabled() {
115 clear();
116 }
117
118
119 void JvmtiEventEnabled::clear() {
120 _enabled_bits = 0;
121 #ifndef PRODUCT
122 _init_guard = JEE_INIT_GUARD;
123 #endif
124 }
125
126 void JvmtiEventEnabled::set_enabled(jvmtiEvent event_type, bool enabled) {
127 jlong bits = get_bits();
128 jlong mask = bit_for(event_type);
129 if (enabled) {
130 bits |= mask;
131 } else {
132 bits &= ~mask;
133 }
134 set_bits(bits);
135 }
136
137
138 ///////////////////////////////////////////////////////////////
139 //
140 // JvmtiEnvThreadEventEnable
141 //
142
143 JvmtiEnvThreadEventEnable::JvmtiEnvThreadEventEnable() {
144 _event_user_enabled.clear();
145 _event_enabled.clear();
146 }
147
148
149 JvmtiEnvThreadEventEnable::~JvmtiEnvThreadEventEnable() {
150 _event_user_enabled.clear();
151 _event_enabled.clear();
152 }
153
154
155 ///////////////////////////////////////////////////////////////
156 //
157 // JvmtiThreadEventEnable
158 //
159
160 JvmtiThreadEventEnable::JvmtiThreadEventEnable() {
161 _event_enabled.clear();
162 }
163
164
165 JvmtiThreadEventEnable::~JvmtiThreadEventEnable() {
166 _event_enabled.clear();
167 }
168
169
170 ///////////////////////////////////////////////////////////////
171 //
172 // JvmtiEnvEventEnable
173 //
174
175 JvmtiEnvEventEnable::JvmtiEnvEventEnable() {
176 _event_user_enabled.clear();
177 _event_callback_enabled.clear();
178 _event_enabled.clear();
179 }
180
181
182 JvmtiEnvEventEnable::~JvmtiEnvEventEnable() {
183 _event_user_enabled.clear();
184 _event_callback_enabled.clear();
185 _event_enabled.clear();
186 }
187
188
189 ///////////////////////////////////////////////////////////////
190 //
191 // VM_EnterInterpOnlyMode
192 //
193
194 class VM_EnterInterpOnlyMode : public VM_Operation {
195 private:
196 JvmtiThreadState *_state;
197
198 public:
199 VM_EnterInterpOnlyMode(JvmtiThreadState *state);
200
201 bool allow_nested_vm_operations() const { return true; }
202 VMOp_Type type() const { return VMOp_EnterInterpOnlyMode; }
203 void doit();
204
205 // to do: this same function is in jvmtiImpl - should be in one place
206 bool can_be_deoptimized(vframe* vf) {
207 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized());
208 }
209 };
210
211 VM_EnterInterpOnlyMode::VM_EnterInterpOnlyMode(JvmtiThreadState *state)
212 : _state(state)
213 {
214 }
215
216
217 void VM_EnterInterpOnlyMode::doit() {
218 // Set up the current stack depth for later tracking
219 _state->invalidate_cur_stack_depth();
220
221 _state->enter_interp_only_mode();
222
223 JavaThread *thread = _state->get_thread();
224 if (thread->has_last_Java_frame()) {
225 // If running in fullspeed mode, single stepping is implemented
226 // as follows: first, the interpreter does not dispatch to
227 // compiled code for threads that have single stepping enabled;
228 // second, we deoptimize all methods on the thread's stack when
229 // interpreted-only mode is enabled the first time for a given
230 // thread (nothing to do if no Java frames yet).
231 int num_marked = 0;
232 ResourceMark resMark;
233 RegisterMap rm(thread, false);
234 for (vframe* vf = thread->last_java_vframe(&rm); vf; vf = vf->sender()) {
235 if (can_be_deoptimized(vf)) {
236 ((compiledVFrame*) vf)->code()->mark_for_deoptimization();
237 ++num_marked;
238 }
239 }
240 if (num_marked > 0) {
241 VM_Deoptimize op;
242 VMThread::execute(&op);
243 }
244 }
245 }
246
247
248 ///////////////////////////////////////////////////////////////
249 //
250 // VM_ChangeSingleStep
251 //
252
253 class VM_ChangeSingleStep : public VM_Operation {
254 private:
255 bool _on;
256
257 public:
258 VM_ChangeSingleStep(bool on);
259 VMOp_Type type() const { return VMOp_ChangeSingleStep; }
260 bool allow_nested_vm_operations() const { return true; }
261 void doit(); // method definition is after definition of JvmtiEventControllerPrivate because of scoping
262 };
263
264
265 VM_ChangeSingleStep::VM_ChangeSingleStep(bool on)
266 : _on(on != 0)
267 {
268 }
269
270
271
272
273 ///////////////////////////////////////////////////////////////
274 //
275 // JvmtiEventControllerPrivate
276 //
277 // Private internal implementation methods for JvmtiEventController.
278 //
279 // These methods are thread safe either because they are called
280 // in early VM initialization which is single threaded, or they
281 // hold the JvmtiThreadState_lock.
282 //
283
284 class JvmtiEventControllerPrivate : public AllStatic {
285 static bool _initialized;
286 public:
287 static void set_should_post_single_step(bool on);
288 static void enter_interp_only_mode(JvmtiThreadState *state);
289 static void leave_interp_only_mode(JvmtiThreadState *state);
290 static void recompute_enabled();
291 static jlong recompute_env_enabled(JvmtiEnvBase* env);
292 static jlong recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state);
293 static jlong recompute_thread_enabled(JvmtiThreadState *state);
294 static void event_init();
295
296 static void set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
297 jvmtiEvent event_type, bool enabled);
298 static void set_event_callbacks(JvmtiEnvBase *env,
299 const jvmtiEventCallbacks* callbacks,
300 jint size_of_callbacks);
301
302 static void set_extension_event_callback(JvmtiEnvBase *env,
303 jint extension_event_index,
304 jvmtiExtensionEvent callback);
305
306 static void set_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
307 static void clear_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
308 static void clear_to_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
309 static void change_field_watch(jvmtiEvent event_type, bool added);
310
311 static void thread_started(JavaThread *thread);
312 static void thread_ended(JavaThread *thread);
313
314 static void env_initialize(JvmtiEnvBase *env);
315 static void env_dispose(JvmtiEnvBase *env);
316
317 static void vm_start();
318 static void vm_init();
319 static void vm_death();
320
321 static void trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed);
322 static void trace_changed(jlong now_enabled, jlong changed);
323 };
324
325 bool JvmtiEventControllerPrivate::_initialized = false;
326
327 void JvmtiEventControllerPrivate::set_should_post_single_step(bool on) {
328 // we have permission to do this, VM op doesn't
329 JvmtiExport::set_should_post_single_step(on);
330 }
331
332
333 // This change must always be occur when at a safepoint.
334 // Being at a safepoint causes the interpreter to use the
335 // safepoint dispatch table which we overload to find single
336 // step points. Just to be sure that it has been set, we
337 // call notice_safepoints when turning on single stepping.
338 // When we leave our current safepoint, should_post_single_step
339 // will be checked by the interpreter, and the table kept
340 // or changed accordingly.
341 void VM_ChangeSingleStep::doit() {
342 JvmtiEventControllerPrivate::set_should_post_single_step(_on);
343 if (_on) {
344 Interpreter::notice_safepoints();
345 }
346 }
347
348
349 void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) {
350 EC_TRACE(("[%s] # Entering interpreter only mode",
351 JvmtiTrace::safe_get_thread_name(state->get_thread())));
352
353 VM_EnterInterpOnlyMode op(state);
354 VMThread::execute(&op);
355 }
356
357
358 void
359 JvmtiEventControllerPrivate::leave_interp_only_mode(JvmtiThreadState *state) {
360 EC_TRACE(("[%s] # Leaving interpreter only mode",
361 JvmtiTrace::safe_get_thread_name(state->get_thread())));
362 state->leave_interp_only_mode();
363 }
364
365
366 void
367 JvmtiEventControllerPrivate::trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed) {
368 #ifdef JVMTI_TRACE
369 if (JvmtiTrace::trace_event_controller()) {
370 SafeResourceMark rm;
371 // traces standard events only
372 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
373 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
374 if (changed & bit) {
375 // it changed, print it
376 log_trace(jvmti)("[%s] # %s event %s",
377 JvmtiTrace::safe_get_thread_name(state->get_thread()),
378 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
379 }
380 }
381 }
382 #endif /*JVMTI_TRACE */
383 }
384
385
386 void
387 JvmtiEventControllerPrivate::trace_changed(jlong now_enabled, jlong changed) {
388 #ifdef JVMTI_TRACE
389 if (JvmtiTrace::trace_event_controller()) {
390 SafeResourceMark rm;
391 // traces standard events only
392 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
393 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
394 if (changed & bit) {
395 // it changed, print it
396 log_trace(jvmti)("[-] # %s event %s",
397 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
398 }
399 }
400 }
401 #endif /*JVMTI_TRACE */
402 }
403
404
405 // For the specified env: compute the currently truly enabled events
406 // set external state accordingly.
407 // Return value and set value must include all events.
408 // But outside this class, only non-thread-filtered events can be queried..
409 jlong
410 JvmtiEventControllerPrivate::recompute_env_enabled(JvmtiEnvBase* env) {
411 jlong was_enabled = env->env_event_enable()->_event_enabled.get_bits();
412 jlong now_enabled =
413 env->env_event_enable()->_event_callback_enabled.get_bits() &
414 env->env_event_enable()->_event_user_enabled.get_bits();
415
416 switch (env->phase()) {
417 case JVMTI_PHASE_PRIMORDIAL:
418 case JVMTI_PHASE_ONLOAD:
419 // only these events allowed in primordial or onload phase
420 now_enabled &= (EARLY_EVENT_BITS & ~THREAD_FILTERED_EVENT_BITS);
421 break;
422 case JVMTI_PHASE_START:
423 // only these events allowed in start phase
424 now_enabled &= EARLY_EVENT_BITS;
425 break;
426 case JVMTI_PHASE_LIVE:
427 // all events allowed during live phase
428 break;
429 case JVMTI_PHASE_DEAD:
430 // no events allowed when dead
431 now_enabled = 0;
432 break;
433 default:
434 assert(false, "no other phases - sanity check");
435 break;
436 }
437
438 // will we really send these events to this env
439 env->env_event_enable()->_event_enabled.set_bits(now_enabled);
440
441 trace_changed(now_enabled, (now_enabled ^ was_enabled) & ~THREAD_FILTERED_EVENT_BITS);
442
443 return now_enabled;
444 }
445
446
447 // For the specified env and thread: compute the currently truly enabled events
448 // set external state accordingly. Only thread-filtered events are included.
449 jlong
450 JvmtiEventControllerPrivate::recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state) {
451 JvmtiEnv *env = ets->get_env();
452
453 jlong was_enabled = ets->event_enable()->_event_enabled.get_bits();
454 jlong now_enabled = THREAD_FILTERED_EVENT_BITS &
455 env->env_event_enable()->_event_callback_enabled.get_bits() &
456 (env->env_event_enable()->_event_user_enabled.get_bits() |
457 ets->event_enable()->_event_user_enabled.get_bits());
458
459 // for frame pops and field watchs, computed enabled state
460 // is only true if an event has been requested
461 if (!ets->has_frame_pops()) {
462 now_enabled &= ~FRAME_POP_BIT;
463 }
464 if (*((int *)JvmtiExport::get_field_access_count_addr()) == 0) {
465 now_enabled &= ~FIELD_ACCESS_BIT;
466 }
467 if (*((int *)JvmtiExport::get_field_modification_count_addr()) == 0) {
468 now_enabled &= ~FIELD_MODIFICATION_BIT;
469 }
470
471 switch (JvmtiEnv::get_phase()) {
472 case JVMTI_PHASE_DEAD:
473 // no events allowed when dead
474 now_enabled = 0;
475 break;
476 default:
477 break;
478 }
479
480 // if anything changed do update
481 if (now_enabled != was_enabled) {
482
483 // will we really send these events to this thread x env
484 ets->event_enable()->_event_enabled.set_bits(now_enabled);
485
486 // If the enabled status of the single step or breakpoint events changed,
487 // the location status may need to change as well.
488 jlong changed = now_enabled ^ was_enabled;
489 if (changed & SINGLE_STEP_BIT) {
490 ets->reset_current_location(JVMTI_EVENT_SINGLE_STEP, (now_enabled & SINGLE_STEP_BIT) != 0);
491 }
492 if (changed & BREAKPOINT_BIT) {
493 ets->reset_current_location(JVMTI_EVENT_BREAKPOINT, (now_enabled & BREAKPOINT_BIT) != 0);
494 }
495 trace_changed(state, now_enabled, changed);
496 }
497 return now_enabled;
498 }
499
500
501 // For the specified thread: compute the currently truly enabled events
502 // set external state accordingly. Only thread-filtered events are included.
503 jlong
504 JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) {
505 if (state == NULL) {
506 // associated JavaThread is exiting
507 return (jlong)0;
508 }
509
510 julong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits();
511 julong any_env_enabled = 0;
512
513 {
514 // This iteration will include JvmtiEnvThreadStates whoses environments
515 // have been disposed. These JvmtiEnvThreadStates must not be filtered
516 // as recompute must be called on them to disable their events,
517 JvmtiEnvThreadStateIterator it(state);
518 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
519 any_env_enabled |= recompute_env_thread_enabled(ets, state);
520 }
521 }
522
523 if (any_env_enabled != was_any_env_enabled) {
524 // mark if event is truly enabled on this thread in any environment
525 state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled);
526
527 // compute interp_only mode
528 bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0;
529 bool is_now_interp = state->is_interp_only_mode();
530
531 if (should_be_interp != is_now_interp) {
532 if (should_be_interp) {
533 enter_interp_only_mode(state);
534 } else {
535 leave_interp_only_mode(state);
536 }
537 }
538
539 // update the JavaThread cached value for thread-specific should_post_on_exceptions value
540 bool should_post_on_exceptions = (any_env_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0;
541 state->set_should_post_on_exceptions(should_post_on_exceptions);
542 }
543
544 return any_env_enabled;
545 }
546
547
548 // Compute truly enabled events - meaning if the event can and could be
549 // sent. An event is truly enabled if it is user enabled on the thread
550 // or globally user enabled, but only if there is a callback or event hook
551 // for it and, for field watch and frame pop, one has been set.
552 // Compute if truly enabled, per thread, per environment, per combination
553 // (thread x environment), and overall. These merges are true if any is true.
554 // True per thread if some environment has callback set and the event is globally
555 // enabled or enabled for this thread.
556 // True per environment if the callback is set and the event is globally
557 // enabled in this environment or enabled for any thread in this environment.
558 // True per combination if the environment has the callback set and the
559 // event is globally enabled in this environment or the event is enabled
560 // for this thread and environment.
561 //
562 // All states transitions dependent on these transitions are also handled here.
563 void
564 JvmtiEventControllerPrivate::recompute_enabled() {
565 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
566
567 // event enabled for any thread in any environment
568 julong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits();
569 julong any_env_thread_enabled = 0;
570
571 EC_TRACE(("[-] # recompute enabled - before " JULONG_FORMAT_X, was_any_env_thread_enabled));
572
573 // compute non-thread-filters events.
574 // This must be done separately from thread-filtered events, since some
575 // events can occur before any threads exist.
576 JvmtiEnvIterator it;
577 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
578 any_env_thread_enabled |= recompute_env_enabled(env);
579 }
580
581 // We need to create any missing jvmti_thread_state if there are globally set thread
582 // filtered events and there weren't last time
583 if ( (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 &&
584 (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) {
585 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) {
586 // state_for_while_locked() makes tp->is_exiting() check
587 JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing
588 }
589 }
590
591 // compute and set thread-filtered events
592 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
593 any_env_thread_enabled |= recompute_thread_enabled(state);
594 }
595
596 // set universal state (across all envs and threads)
597 jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled;
598 if (delta != 0) {
599 JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0);
600 JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0);
601 JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0);
602 JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0);
603 JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0);
604 JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0);
605 JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0);
606 JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0);
607 JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0);
608 JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0);
609 JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0);
610 JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0);
611 JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0);
612 JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0);
613 JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0);
614 JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0);
615 JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0);
616 JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0);
617 JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0);
618 JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0);
619 JvmtiExport::set_should_post_sampled_object_alloc((any_env_thread_enabled & SAMPLED_OBJECT_ALLOC_BIT) != 0);
620
621 // need this if we want thread events or we need them to init data
622 JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0);
623
624 // If single stepping is turned on or off, execute the VM op to change it.
625 if (delta & SINGLE_STEP_BIT) {
626 switch (JvmtiEnv::get_phase()) {
627 case JVMTI_PHASE_DEAD:
628 // If the VM is dying we can't execute VM ops
629 break;
630 case JVMTI_PHASE_LIVE: {
631 VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0);
632 VMThread::execute(&op);
633 break;
634 }
635 default:
636 assert(false, "should never come here before live phase");
637 break;
638 }
639 }
640
641 // set global truly enabled, that is, any thread in any environment
642 JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled);
643
644 // set global should_post_on_exceptions
645 JvmtiExport::set_should_post_on_exceptions((any_env_thread_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0);
646
647 }
648
649 EC_TRACE(("[-] # recompute enabled - after " JULONG_FORMAT_X, any_env_thread_enabled));
650 }
651
652
653 void
654 JvmtiEventControllerPrivate::thread_started(JavaThread *thread) {
655 assert(thread->is_Java_thread(), "Must be JavaThread");
656 assert(thread == Thread::current(), "must be current thread");
657 assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist");
658
659 EC_TRACE(("[%s] # thread started", JvmtiTrace::safe_get_thread_name(thread)));
660
661 // if we have any thread filtered events globally enabled, create/update the thread state
662 if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) {
663 MutexLocker mu(JvmtiThreadState_lock);
664 // create the thread state if missing
665 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
666 if (state != NULL) { // skip threads with no JVMTI thread state
667 recompute_thread_enabled(state);
668 }
669 }
670 }
671
672
673 void
674 JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) {
675 // Removes the JvmtiThreadState associated with the specified thread.
676 // May be called after all environments have been disposed.
677 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
678
679 EC_TRACE(("[%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread)));
680
681 JvmtiThreadState *state = thread->jvmti_thread_state();
682 assert(state != NULL, "else why are we here?");
683 delete state;
684 }
685
686 void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env,
687 const jvmtiEventCallbacks* callbacks,
688 jint size_of_callbacks) {
689 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
690 EC_TRACE(("[*] # set event callbacks"));
691
692 env->set_event_callbacks(callbacks, size_of_callbacks);
693 jlong enabled_bits = 0;
694 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
695 jvmtiEvent evt_t = (jvmtiEvent)ei;
696 if (env->has_callback(evt_t)) {
697 enabled_bits |= JvmtiEventEnabled::bit_for(evt_t);
698 }
699 }
700 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
701 recompute_enabled();
702 }
703
704 void
705 JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env,
706 jint extension_event_index,
707 jvmtiExtensionEvent callback)
708 {
709 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
710 EC_TRACE(("[*] # set extension event callback"));
711
712 // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL
713 assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL &&
714 extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check");
715
716
717 // As the bits for both standard (jvmtiEvent) and extension
718 // (jvmtiExtEvents) are stored in the same word we cast here to
719 // jvmtiEvent to set/clear the bit for this extension event.
720 jvmtiEvent event_type = (jvmtiEvent)extension_event_index;
721
722 // Prevent a possible race condition where events are re-enabled by a call to
723 // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate
724 // environment check and before the lock is acquired.
725 // We can safely do the is_valid check now, as JvmtiThreadState_lock is held.
726 bool enabling = (callback != NULL) && (env->is_valid());
727 env->env_event_enable()->set_user_enabled(event_type, enabling);
728
729 // update the callback
730 jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks();
731 switch (extension_event_index) {
732 case EXT_EVENT_CLASS_UNLOAD :
733 ext_callbacks->ClassUnload = callback;
734 break;
735 default:
736 ShouldNotReachHere();
737 }
738
739 // update the callback enable/disable bit
740 jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits();
741 jlong bit_for = JvmtiEventEnabled::bit_for(event_type);
742 if (enabling) {
743 enabled_bits |= bit_for;
744 } else {
745 enabled_bits &= ~bit_for;
746 }
747 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
748
749 recompute_enabled();
750 }
751
752
753 void
754 JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) {
755 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
756 EC_TRACE(("[*] # env initialize"));
757
758 if (JvmtiEnvBase::is_vm_live()) {
759 // if we didn't initialize event info already (this is a late
760 // launched environment), do it now.
761 event_init();
762 }
763
764 env->initialize();
765
766 // add the JvmtiEnvThreadState to each JvmtiThreadState
767 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
768 state->add_env(env);
769 assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check");
770 }
771 JvmtiEventControllerPrivate::recompute_enabled();
772 }
773
774
775 void
776 JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) {
777 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
778 EC_TRACE(("[*] # env dispose"));
779
780 // Before the environment is marked disposed, disable all events on this
781 // environment (by zapping the callbacks). As a result, the disposed
782 // environment will not call event handlers.
783 set_event_callbacks(env, NULL, 0);
784 for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL;
785 extension_event_index <= EXT_MAX_EVENT_TYPE_VAL;
786 ++extension_event_index) {
787 set_extension_event_callback(env, extension_event_index, NULL);
788 }
789
790 // Let the environment finish disposing itself.
791 env->env_dispose();
792 }
793
794
795 void
796 JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
797 jvmtiEvent event_type, bool enabled) {
798 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
799
800 EC_TRACE(("[%s] # user %s event %s",
801 thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread),
802 enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type)));
803
804 if (thread == NULL) {
805 env->env_event_enable()->set_user_enabled(event_type, enabled);
806 } else {
807 // create the thread state (if it didn't exist before)
808 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
809 if (state != NULL) {
810 state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled);
811 }
812 }
813 recompute_enabled();
814 }
815
816
817 void
818 JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
819 EC_TRACE(("[%s] # set frame pop - frame=%d",
820 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
821 fpop.frame_number() ));
822
823 ets->get_frame_pops()->set(fpop);
824 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
825 }
826
827
828 void
829 JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
830 EC_TRACE(("[%s] # clear frame pop - frame=%d",
831 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
832 fpop.frame_number() ));
833
834 ets->get_frame_pops()->clear(fpop);
835 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
836 }
837
838
839 void
840 JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
841 int cleared_cnt = ets->get_frame_pops()->clear_to(fpop);
842
843 EC_TRACE(("[%s] # clear to frame pop - frame=%d, count=%d",
844 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
845 fpop.frame_number(),
846 cleared_cnt ));
847
848 if (cleared_cnt > 0) {
849 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
850 }
851 }
852
853 void
854 JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) {
855 int *count_addr;
856
857 switch (event_type) {
858 case JVMTI_EVENT_FIELD_MODIFICATION:
859 count_addr = (int *)JvmtiExport::get_field_modification_count_addr();
860 break;
861 case JVMTI_EVENT_FIELD_ACCESS:
862 count_addr = (int *)JvmtiExport::get_field_access_count_addr();
863 break;
864 default:
865 assert(false, "incorrect event");
866 return;
867 }
868
869 EC_TRACE(("[-] # change field watch - %s %s count=%d",
870 event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access",
871 added? "add" : "remove",
872 *count_addr));
873
874 if (added) {
875 (*count_addr)++;
876 if (*count_addr == 1) {
877 recompute_enabled();
878 }
879 } else {
880 if (*count_addr > 0) {
881 (*count_addr)--;
882 if (*count_addr == 0) {
883 recompute_enabled();
884 }
885 } else {
886 assert(false, "field watch out of phase");
887 }
888 }
889 }
890
891 void
892 JvmtiEventControllerPrivate::event_init() {
893 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
894
895 if (_initialized) {
896 return;
897 }
898
899 EC_TRACE(("[-] # VM live"));
900
901 #ifdef ASSERT
902 // check that our idea and the spec's idea of threaded events match
903 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
904 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
905 assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei),
906 "thread filtered event list does not match");
907 }
908 #endif
909
910 _initialized = true;
911 }
912
913 void
914 JvmtiEventControllerPrivate::vm_start() {
915 // some events are now able to be enabled (phase has changed)
916 JvmtiEventControllerPrivate::recompute_enabled();
917 }
918
919
920 void
921 JvmtiEventControllerPrivate::vm_init() {
922 event_init();
923
924 // all the events are now able to be enabled (phase has changed)
925 JvmtiEventControllerPrivate::recompute_enabled();
926 }
927
928
929 void
930 JvmtiEventControllerPrivate::vm_death() {
931 // events are disabled (phase has changed)
932 JvmtiEventControllerPrivate::recompute_enabled();
933 }
934
935
936 ///////////////////////////////////////////////////////////////
937 //
938 // JvmtiEventController
939 //
940
941 JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled;
942
943 bool
944 JvmtiEventController::is_global_event(jvmtiEvent event_type) {
945 assert(is_valid_event_type(event_type), "invalid event type");
946 jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL);
947 return((bit_for & GLOBAL_EVENT_BITS)!=0);
948 }
949
950 void
951 JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) {
952 if (Threads::number_of_threads() == 0) {
953 // during early VM start-up locks don't exist, but we are safely single threaded,
954 // call the functionality without holding the JvmtiThreadState_lock.
955 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
956 } else {
957 MutexLocker mu(JvmtiThreadState_lock);
958 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
959 }
960 }
961
962
963 void
964 JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env,
965 const jvmtiEventCallbacks* callbacks,
966 jint size_of_callbacks) {
967 if (Threads::number_of_threads() == 0) {
968 // during early VM start-up locks don't exist, but we are safely single threaded,
969 // call the functionality without holding the JvmtiThreadState_lock.
970 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
971 } else {
972 MutexLocker mu(JvmtiThreadState_lock);
973 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
974 }
975 }
976
977 void
978 JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env,
979 jint extension_event_index,
980 jvmtiExtensionEvent callback) {
981 if (Threads::number_of_threads() == 0) {
982 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
983 } else {
984 MutexLocker mu(JvmtiThreadState_lock);
985 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
986 }
987 }
988
989
990
991
992 void
993 JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
994 MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
995 JvmtiEventControllerPrivate::set_frame_pop(ets, fpop);
996 }
997
998
999 void
1000 JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1001 MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1002 JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop);
1003 }
1004
1005
1006 void
1007 JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1008 MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1009 JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop);
1010 }
1011
1012 void
1013 JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) {
1014 MutexLocker mu(JvmtiThreadState_lock);
1015 JvmtiEventControllerPrivate::change_field_watch(event_type, added);
1016 }
1017
1018 void
1019 JvmtiEventController::thread_started(JavaThread *thread) {
1020 // operates only on the current thread
1021 // JvmtiThreadState_lock grabbed only if needed.
1022 JvmtiEventControllerPrivate::thread_started(thread);
1023 }
1024
1025 void
1026 JvmtiEventController::thread_ended(JavaThread *thread) {
1027 // operates only on the current thread
1028 // JvmtiThreadState_lock grabbed only if needed.
1029 JvmtiEventControllerPrivate::thread_ended(thread);
1030 }
1031
1032 void
1033 JvmtiEventController::env_initialize(JvmtiEnvBase *env) {
1034 if (Threads::number_of_threads() == 0) {
1035 // during early VM start-up locks don't exist, but we are safely single threaded,
1036 // call the functionality without holding the JvmtiThreadState_lock.
1037 JvmtiEventControllerPrivate::env_initialize(env);
1038 } else {
1039 MutexLocker mu(JvmtiThreadState_lock);
1040 JvmtiEventControllerPrivate::env_initialize(env);
1041 }
1042 }
1043
1044 void
1045 JvmtiEventController::env_dispose(JvmtiEnvBase *env) {
1046 if (Threads::number_of_threads() == 0) {
1047 // during early VM start-up locks don't exist, but we are safely single threaded,
1048 // call the functionality without holding the JvmtiThreadState_lock.
1049 JvmtiEventControllerPrivate::env_dispose(env);
1050 } else {
1051 MutexLocker mu(JvmtiThreadState_lock);
1052 JvmtiEventControllerPrivate::env_dispose(env);
1053 }
1054 }
1055
1056
1057 void
1058 JvmtiEventController::vm_start() {
1059 if (JvmtiEnvBase::environments_might_exist()) {
1060 MutexLocker mu(JvmtiThreadState_lock);
1061 JvmtiEventControllerPrivate::vm_start();
1062 }
1063 }
1064
1065 void
1066 JvmtiEventController::vm_init() {
1067 if (JvmtiEnvBase::environments_might_exist()) {
1068 MutexLocker mu(JvmtiThreadState_lock);
1069 JvmtiEventControllerPrivate::vm_init();
1070 }
1071 }
1072
1073 void
1074 JvmtiEventController::vm_death() {
1075 if (JvmtiEnvBase::environments_might_exist()) {
1076 MutexLocker mu(JvmtiThreadState_lock);
1077 JvmtiEventControllerPrivate::vm_death();
1078 }
1079 }