1 /*
2 * Copyright (c) 2003, 2018, 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
88 // bits for extension events
89 static const jlong CLASS_UNLOAD_BIT = (((jlong)1) << (EXT_EVENT_CLASS_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
90
91
92 static const jlong MONITOR_BITS = MONITOR_CONTENDED_ENTER_BIT | MONITOR_CONTENDED_ENTERED_BIT |
93 MONITOR_WAIT_BIT | MONITOR_WAITED_BIT;
94 static const jlong EXCEPTION_BITS = EXCEPTION_THROW_BIT | EXCEPTION_CATCH_BIT;
95 static const jlong INTERP_EVENT_BITS = SINGLE_STEP_BIT | METHOD_ENTRY_BIT | METHOD_EXIT_BIT |
96 FRAME_POP_BIT | FIELD_ACCESS_BIT | FIELD_MODIFICATION_BIT;
97 static const jlong THREAD_FILTERED_EVENT_BITS = INTERP_EVENT_BITS | EXCEPTION_BITS | MONITOR_BITS |
98 BREAKPOINT_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | THREAD_END_BIT;
99 static const jlong NEED_THREAD_LIFE_EVENTS = THREAD_FILTERED_EVENT_BITS | THREAD_START_BIT;
100 static const jlong EARLY_EVENT_BITS = CLASS_FILE_LOAD_HOOK_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT |
101 VM_START_BIT | VM_INIT_BIT | VM_DEATH_BIT | NATIVE_METHOD_BIND_BIT |
102 THREAD_START_BIT | THREAD_END_BIT |
103 COMPILED_METHOD_LOAD_BIT | COMPILED_METHOD_UNLOAD_BIT |
104 DYNAMIC_CODE_GENERATED_BIT;
105 static const jlong GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS;
106 static const jlong SHOULD_POST_ON_EXCEPTIONS_BITS = EXCEPTION_BITS | METHOD_EXIT_BIT | FRAME_POP_BIT;
107
108 ///////////////////////////////////////////////////////////////
109 //
110 // JvmtiEventEnabled
111 //
112
113 JvmtiEventEnabled::JvmtiEventEnabled() {
114 clear();
115 }
116
117
118 void JvmtiEventEnabled::clear() {
119 _enabled_bits = 0;
120 #ifndef PRODUCT
121 _init_guard = JEE_INIT_GUARD;
122 #endif
123 }
124
125 void JvmtiEventEnabled::set_enabled(jvmtiEvent event_type, bool enabled) {
126 jlong bits = get_bits();
127 jlong mask = bit_for(event_type);
128 if (enabled) {
129 bits |= mask;
130 } else {
131 bits &= ~mask;
132 }
133 set_bits(bits);
134 }
135
136
137 ///////////////////////////////////////////////////////////////
138 //
139 // JvmtiEnvThreadEventEnable
140 //
141
142 JvmtiEnvThreadEventEnable::JvmtiEnvThreadEventEnable() {
143 _event_user_enabled.clear();
144 _event_enabled.clear();
145 }
146
147
148 JvmtiEnvThreadEventEnable::~JvmtiEnvThreadEventEnable() {
149 _event_user_enabled.clear();
150 _event_enabled.clear();
151 }
152
153
154 ///////////////////////////////////////////////////////////////
155 //
156 // JvmtiThreadEventEnable
157 //
158
159 JvmtiThreadEventEnable::JvmtiThreadEventEnable() {
160 _event_enabled.clear();
161 }
162
163
164 JvmtiThreadEventEnable::~JvmtiThreadEventEnable() {
165 _event_enabled.clear();
166 }
167
168
169 ///////////////////////////////////////////////////////////////
170 //
171 // JvmtiEnvEventEnable
172 //
173
174 JvmtiEnvEventEnable::JvmtiEnvEventEnable() {
175 _event_user_enabled.clear();
176 _event_callback_enabled.clear();
177 _event_enabled.clear();
178 }
179
180
181 JvmtiEnvEventEnable::~JvmtiEnvEventEnable() {
182 _event_user_enabled.clear();
183 _event_callback_enabled.clear();
184 _event_enabled.clear();
185 }
186
187
188 ///////////////////////////////////////////////////////////////
189 //
190 // VM_EnterInterpOnlyMode
191 //
192
193 class VM_EnterInterpOnlyMode : public VM_Operation {
194 private:
195 JvmtiThreadState *_state;
196
197 public:
198 VM_EnterInterpOnlyMode(JvmtiThreadState *state);
199
200 bool allow_nested_vm_operations() const { return true; }
201 VMOp_Type type() const { return VMOp_EnterInterpOnlyMode; }
202 void doit();
203
204 // to do: this same function is in jvmtiImpl - should be in one place
205 bool can_be_deoptimized(vframe* vf) {
206 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized());
207 }
208 };
209
210 VM_EnterInterpOnlyMode::VM_EnterInterpOnlyMode(JvmtiThreadState *state)
211 : _state(state)
212 {
213 }
214
215
216 void VM_EnterInterpOnlyMode::doit() {
217 // Set up the current stack depth for later tracking
218 _state->invalidate_cur_stack_depth();
219
220 _state->enter_interp_only_mode();
221
222 JavaThread *thread = _state->get_thread();
223 if (thread->has_last_Java_frame()) {
224 // If running in fullspeed mode, single stepping is implemented
225 // as follows: first, the interpreter does not dispatch to
226 // compiled code for threads that have single stepping enabled;
227 // second, we deoptimize all methods on the thread's stack when
228 // interpreted-only mode is enabled the first time for a given
229 // thread (nothing to do if no Java frames yet).
230 int num_marked = 0;
231 ResourceMark resMark;
232 RegisterMap rm(thread, false);
233 for (vframe* vf = thread->last_java_vframe(&rm); vf; vf = vf->sender()) {
234 if (can_be_deoptimized(vf)) {
235 ((compiledVFrame*) vf)->code()->mark_for_deoptimization();
236 ++num_marked;
237 }
238 }
239 if (num_marked > 0) {
240 VM_Deoptimize op;
241 VMThread::execute(&op);
242 }
243 }
244 }
245
246
247 ///////////////////////////////////////////////////////////////
248 //
249 // VM_ChangeSingleStep
250 //
251
252 class VM_ChangeSingleStep : public VM_Operation {
253 private:
254 bool _on;
255
256 public:
257 VM_ChangeSingleStep(bool on);
258 VMOp_Type type() const { return VMOp_ChangeSingleStep; }
259 bool allow_nested_vm_operations() const { return true; }
260 void doit(); // method definition is after definition of JvmtiEventControllerPrivate because of scoping
261 };
262
263
264 VM_ChangeSingleStep::VM_ChangeSingleStep(bool on)
265 : _on(on != 0)
266 {
267 }
268
269
270
271
272 ///////////////////////////////////////////////////////////////
273 //
274 // JvmtiEventControllerPrivate
275 //
276 // Private internal implementation methods for JvmtiEventController.
277 //
278 // These methods are thread safe either because they are called
279 // in early VM initialization which is single threaded, or they
280 // hold the JvmtiThreadState_lock.
281 //
282
283 class JvmtiEventControllerPrivate : public AllStatic {
284 static bool _initialized;
285 public:
286 static void set_should_post_single_step(bool on);
287 static void enter_interp_only_mode(JvmtiThreadState *state);
288 static void leave_interp_only_mode(JvmtiThreadState *state);
289 static void recompute_enabled();
290 static jlong recompute_env_enabled(JvmtiEnvBase* env);
291 static jlong recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state);
292 static jlong recompute_thread_enabled(JvmtiThreadState *state);
293 static void event_init();
294
295 static void set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
296 jvmtiEvent event_type, bool enabled);
297 static void set_event_callbacks(JvmtiEnvBase *env,
298 const jvmtiEventCallbacks* callbacks,
299 jint size_of_callbacks);
300
301 static void set_extension_event_callback(JvmtiEnvBase *env,
302 jint extension_event_index,
303 jvmtiExtensionEvent callback);
304
305 static void set_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
306 static void clear_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
307 static void clear_to_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
308 static void change_field_watch(jvmtiEvent event_type, bool added);
309
310 static void thread_started(JavaThread *thread);
311 static void thread_ended(JavaThread *thread);
312
313 static void env_initialize(JvmtiEnvBase *env);
314 static void env_dispose(JvmtiEnvBase *env);
315
316 static void vm_start();
317 static void vm_init();
318 static void vm_death();
319
320 static void trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed);
321 static void trace_changed(jlong now_enabled, jlong changed);
322 };
323
324 bool JvmtiEventControllerPrivate::_initialized = false;
325
326 void JvmtiEventControllerPrivate::set_should_post_single_step(bool on) {
327 // we have permission to do this, VM op doesn't
328 JvmtiExport::set_should_post_single_step(on);
329 }
330
331
332 // This change must always be occur when at a safepoint.
333 // Being at a safepoint causes the interpreter to use the
334 // safepoint dispatch table which we overload to find single
335 // step points. Just to be sure that it has been set, we
336 // call notice_safepoints when turning on single stepping.
337 // When we leave our current safepoint, should_post_single_step
338 // will be checked by the interpreter, and the table kept
339 // or changed accordingly.
340 void VM_ChangeSingleStep::doit() {
341 JvmtiEventControllerPrivate::set_should_post_single_step(_on);
342 if (_on) {
343 Interpreter::notice_safepoints();
344 }
345 }
346
347
348 void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) {
349 EC_TRACE(("[%s] # Entering interpreter only mode",
350 JvmtiTrace::safe_get_thread_name(state->get_thread())));
351
352 VM_EnterInterpOnlyMode op(state);
353 VMThread::execute(&op);
354 }
355
356
357 void
358 JvmtiEventControllerPrivate::leave_interp_only_mode(JvmtiThreadState *state) {
359 EC_TRACE(("[%s] # Leaving interpreter only mode",
360 JvmtiTrace::safe_get_thread_name(state->get_thread())));
361 state->leave_interp_only_mode();
362 }
363
364
365 void
366 JvmtiEventControllerPrivate::trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed) {
367 #ifdef JVMTI_TRACE
368 if (JvmtiTrace::trace_event_controller()) {
369 SafeResourceMark rm;
370 // traces standard events only
371 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
372 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
373 if (changed & bit) {
374 // it changed, print it
375 log_trace(jvmti)("[%s] # %s event %s",
376 JvmtiTrace::safe_get_thread_name(state->get_thread()),
377 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
378 }
379 }
380 }
381 #endif /*JVMTI_TRACE */
382 }
383
384
385 void
386 JvmtiEventControllerPrivate::trace_changed(jlong now_enabled, jlong changed) {
387 #ifdef JVMTI_TRACE
388 if (JvmtiTrace::trace_event_controller()) {
389 SafeResourceMark rm;
390 // traces standard events only
391 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
392 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
393 if (changed & bit) {
394 // it changed, print it
395 log_trace(jvmti)("[-] # %s event %s",
396 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
397 }
398 }
399 }
400 #endif /*JVMTI_TRACE */
401 }
402
403
404 // For the specified env: compute the currently truly enabled events
405 // set external state accordingly.
406 // Return value and set value must include all events.
407 // But outside this class, only non-thread-filtered events can be queried..
408 jlong
409 JvmtiEventControllerPrivate::recompute_env_enabled(JvmtiEnvBase* env) {
410 jlong was_enabled = env->env_event_enable()->_event_enabled.get_bits();
411 jlong now_enabled =
412 env->env_event_enable()->_event_callback_enabled.get_bits() &
413 env->env_event_enable()->_event_user_enabled.get_bits();
414
415 switch (env->phase()) {
416 case JVMTI_PHASE_PRIMORDIAL:
417 case JVMTI_PHASE_ONLOAD:
418 // only these events allowed in primordial or onload phase
419 now_enabled &= (EARLY_EVENT_BITS & ~THREAD_FILTERED_EVENT_BITS);
420 break;
421 case JVMTI_PHASE_START:
422 // only these events allowed in start phase
423 now_enabled &= EARLY_EVENT_BITS;
424 break;
425 case JVMTI_PHASE_LIVE:
426 // all events allowed during live phase
427 break;
428 case JVMTI_PHASE_DEAD:
429 // no events allowed when dead
430 now_enabled = 0;
431 break;
432 default:
433 assert(false, "no other phases - sanity check");
434 break;
435 }
436
437 // will we really send these events to this env
438 env->env_event_enable()->_event_enabled.set_bits(now_enabled);
439
440 trace_changed(now_enabled, (now_enabled ^ was_enabled) & ~THREAD_FILTERED_EVENT_BITS);
441
442 return now_enabled;
443 }
444
445
446 // For the specified env and thread: compute the currently truly enabled events
447 // set external state accordingly. Only thread-filtered events are included.
448 jlong
449 JvmtiEventControllerPrivate::recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state) {
450 JvmtiEnv *env = ets->get_env();
451
452 jlong was_enabled = ets->event_enable()->_event_enabled.get_bits();
453 jlong now_enabled = THREAD_FILTERED_EVENT_BITS &
454 env->env_event_enable()->_event_callback_enabled.get_bits() &
455 (env->env_event_enable()->_event_user_enabled.get_bits() |
456 ets->event_enable()->_event_user_enabled.get_bits());
457
458 // for frame pops and field watchs, computed enabled state
459 // is only true if an event has been requested
460 if (!ets->has_frame_pops()) {
461 now_enabled &= ~FRAME_POP_BIT;
462 }
463 if (*((int *)JvmtiExport::get_field_access_count_addr()) == 0) {
464 now_enabled &= ~FIELD_ACCESS_BIT;
465 }
466 if (*((int *)JvmtiExport::get_field_modification_count_addr()) == 0) {
467 now_enabled &= ~FIELD_MODIFICATION_BIT;
468 }
469
470 switch (JvmtiEnv::get_phase()) {
471 case JVMTI_PHASE_DEAD:
472 // no events allowed when dead
473 now_enabled = 0;
474 break;
475 default:
476 break;
477 }
478
479 // if anything changed do update
480 if (now_enabled != was_enabled) {
481
482 // will we really send these events to this thread x env
483 ets->event_enable()->_event_enabled.set_bits(now_enabled);
484
485 // If the enabled status of the single step or breakpoint events changed,
486 // the location status may need to change as well.
487 jlong changed = now_enabled ^ was_enabled;
488 if (changed & SINGLE_STEP_BIT) {
489 ets->reset_current_location(JVMTI_EVENT_SINGLE_STEP, (now_enabled & SINGLE_STEP_BIT) != 0);
490 }
491 if (changed & BREAKPOINT_BIT) {
492 ets->reset_current_location(JVMTI_EVENT_BREAKPOINT, (now_enabled & BREAKPOINT_BIT) != 0);
493 }
494 trace_changed(state, now_enabled, changed);
495 }
496 return now_enabled;
497 }
498
499
500 // For the specified thread: compute the currently truly enabled events
501 // set external state accordingly. Only thread-filtered events are included.
502 jlong
503 JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) {
504 if (state == NULL) {
505 // associated JavaThread is exiting
506 return (jlong)0;
507 }
508
509 julong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits();
510 julong any_env_enabled = 0;
511 // JVMTI_EVENT_FRAME_POP can be disabled (in the case FRAME_POP_BIT is not set),
512 // but we need to set interp_only if some JvmtiEnvThreadState has frame pop set
513 // to clear the request
514 bool has_frame_pops = false;
515
516 {
517 // This iteration will include JvmtiEnvThreadStates whose environments
518 // have been disposed. These JvmtiEnvThreadStates must not be filtered
519 // as recompute must be called on them to disable their events,
520 JvmtiEnvThreadStateIterator it(state);
521 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
522 any_env_enabled |= recompute_env_thread_enabled(ets, state);
523 has_frame_pops |= ets->has_frame_pops();
524 }
525 }
526
527 if (any_env_enabled != was_any_env_enabled) {
528 // mark if event is truly enabled on this thread in any environment
529 state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled);
530
531 // update the JavaThread cached value for thread-specific should_post_on_exceptions value
532 bool should_post_on_exceptions = (any_env_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0;
533 state->set_should_post_on_exceptions(should_post_on_exceptions);
534 }
535
536 // compute interp_only mode
537 bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0 || has_frame_pops;
538 bool is_now_interp = state->is_interp_only_mode();
539
540 if (should_be_interp != is_now_interp) {
541 if (should_be_interp) {
542 enter_interp_only_mode(state);
543 } else {
544 leave_interp_only_mode(state);
545 }
546 }
547
548 return any_env_enabled;
549 }
550
551
552 // Compute truly enabled events - meaning if the event can and could be
553 // sent. An event is truly enabled if it is user enabled on the thread
554 // or globally user enabled, but only if there is a callback or event hook
555 // for it and, for field watch and frame pop, one has been set.
556 // Compute if truly enabled, per thread, per environment, per combination
557 // (thread x environment), and overall. These merges are true if any is true.
558 // True per thread if some environment has callback set and the event is globally
559 // enabled or enabled for this thread.
560 // True per environment if the callback is set and the event is globally
561 // enabled in this environment or enabled for any thread in this environment.
562 // True per combination if the environment has the callback set and the
563 // event is globally enabled in this environment or the event is enabled
564 // for this thread and environment.
565 //
566 // All states transitions dependent on these transitions are also handled here.
567 void
568 JvmtiEventControllerPrivate::recompute_enabled() {
569 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
570
571 // event enabled for any thread in any environment
572 julong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits();
573 julong any_env_thread_enabled = 0;
574
575 EC_TRACE(("[-] # recompute enabled - before " JULONG_FORMAT_X, was_any_env_thread_enabled));
576
577 // compute non-thread-filters events.
578 // This must be done separately from thread-filtered events, since some
579 // events can occur before any threads exist.
580 JvmtiEnvIterator it;
581 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
582 any_env_thread_enabled |= recompute_env_enabled(env);
583 }
584
585 // We need to create any missing jvmti_thread_state if there are globally set thread
586 // filtered events and there weren't last time
587 if ( (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 &&
588 (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) {
589 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) {
590 // state_for_while_locked() makes tp->is_exiting() check
591 JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing
592 }
593 }
594
595 // compute and set thread-filtered events
596 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
597 any_env_thread_enabled |= recompute_thread_enabled(state);
598 }
599
600 // set universal state (across all envs and threads)
601 jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled;
602 if (delta != 0) {
603 JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0);
604 JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0);
605 JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0);
606 JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0);
607 JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0);
608 JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0);
609 JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0);
610 JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0);
611 JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0);
612 JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0);
613 JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0);
614 JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0);
615 JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0);
616 JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0);
617 JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0);
618 JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0);
619 JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0);
620 JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0);
621 JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0);
622 JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0);
623
624 // need this if we want thread events or we need them to init data
625 JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0);
626
627 // If single stepping is turned on or off, execute the VM op to change it.
628 if (delta & SINGLE_STEP_BIT) {
629 switch (JvmtiEnv::get_phase()) {
630 case JVMTI_PHASE_DEAD:
631 // If the VM is dying we can't execute VM ops
632 break;
633 case JVMTI_PHASE_LIVE: {
634 VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0);
635 VMThread::execute(&op);
636 break;
637 }
638 default:
639 assert(false, "should never come here before live phase");
640 break;
641 }
642 }
643
644 // set global truly enabled, that is, any thread in any environment
645 JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled);
646
647 // set global should_post_on_exceptions
648 JvmtiExport::set_should_post_on_exceptions((any_env_thread_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0);
649
650 }
651
652 EC_TRACE(("[-] # recompute enabled - after " JULONG_FORMAT_X, any_env_thread_enabled));
653 }
654
655
656 void
657 JvmtiEventControllerPrivate::thread_started(JavaThread *thread) {
658 assert(thread->is_Java_thread(), "Must be JavaThread");
659 assert(thread == Thread::current(), "must be current thread");
660 assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist");
661
662 EC_TRACE(("[%s] # thread started", JvmtiTrace::safe_get_thread_name(thread)));
663
664 // if we have any thread filtered events globally enabled, create/update the thread state
665 if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) {
666 MutexLocker mu(JvmtiThreadState_lock);
667 // create the thread state if missing
668 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
669 if (state != NULL) { // skip threads with no JVMTI thread state
670 recompute_thread_enabled(state);
671 }
672 }
673 }
674
675
676 void
677 JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) {
678 // Removes the JvmtiThreadState associated with the specified thread.
679 // May be called after all environments have been disposed.
680 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
681
682 EC_TRACE(("[%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread)));
683
684 JvmtiThreadState *state = thread->jvmti_thread_state();
685 assert(state != NULL, "else why are we here?");
686 delete state;
687 }
688
689 void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env,
690 const jvmtiEventCallbacks* callbacks,
691 jint size_of_callbacks) {
692 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
693 EC_TRACE(("[*] # set event callbacks"));
694
695 env->set_event_callbacks(callbacks, size_of_callbacks);
696 jlong enabled_bits = 0;
697 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
698 jvmtiEvent evt_t = (jvmtiEvent)ei;
699 if (env->has_callback(evt_t)) {
700 enabled_bits |= JvmtiEventEnabled::bit_for(evt_t);
701 }
702 }
703 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
704 recompute_enabled();
705 }
706
707 void
708 JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env,
709 jint extension_event_index,
710 jvmtiExtensionEvent callback)
711 {
712 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
713 EC_TRACE(("[*] # set extension event callback"));
714
715 // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL
716 assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL &&
717 extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check");
718
719
720 // As the bits for both standard (jvmtiEvent) and extension
721 // (jvmtiExtEvents) are stored in the same word we cast here to
722 // jvmtiEvent to set/clear the bit for this extension event.
723 jvmtiEvent event_type = (jvmtiEvent)extension_event_index;
724
725 // Prevent a possible race condition where events are re-enabled by a call to
726 // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate
727 // environment check and before the lock is acquired.
728 // We can safely do the is_valid check now, as JvmtiThreadState_lock is held.
729 bool enabling = (callback != NULL) && (env->is_valid());
730 env->env_event_enable()->set_user_enabled(event_type, enabling);
731
732 // update the callback
733 jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks();
734 switch (extension_event_index) {
735 case EXT_EVENT_CLASS_UNLOAD :
736 ext_callbacks->ClassUnload = callback;
737 break;
738 default:
739 ShouldNotReachHere();
740 }
741
742 // update the callback enable/disable bit
743 jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits();
744 jlong bit_for = JvmtiEventEnabled::bit_for(event_type);
745 if (enabling) {
746 enabled_bits |= bit_for;
747 } else {
748 enabled_bits &= ~bit_for;
749 }
750 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
751
752 recompute_enabled();
753 }
754
755
756 void
757 JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) {
758 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
759 EC_TRACE(("[*] # env initialize"));
760
761 if (JvmtiEnvBase::is_vm_live()) {
762 // if we didn't initialize event info already (this is a late
763 // launched environment), do it now.
764 event_init();
765 }
766
767 env->initialize();
768
769 // add the JvmtiEnvThreadState to each JvmtiThreadState
770 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
771 state->add_env(env);
772 assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check");
773 }
774 JvmtiEventControllerPrivate::recompute_enabled();
775 }
776
777
778 void
779 JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) {
780 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
781 EC_TRACE(("[*] # env dispose"));
782
783 // Before the environment is marked disposed, disable all events on this
784 // environment (by zapping the callbacks). As a result, the disposed
785 // environment will not call event handlers.
786 set_event_callbacks(env, NULL, 0);
787 for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL;
788 extension_event_index <= EXT_MAX_EVENT_TYPE_VAL;
789 ++extension_event_index) {
790 set_extension_event_callback(env, extension_event_index, NULL);
791 }
792
793 // Let the environment finish disposing itself.
794 env->env_dispose();
795 }
796
797
798 void
799 JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
800 jvmtiEvent event_type, bool enabled) {
801 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
802
803 EC_TRACE(("[%s] # user %s event %s",
804 thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread),
805 enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type)));
806
807 if (thread == NULL) {
808 env->env_event_enable()->set_user_enabled(event_type, enabled);
809 } else {
810 // create the thread state (if it didn't exist before)
811 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
812 if (state != NULL) {
813 state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled);
814 }
815 }
816 recompute_enabled();
817 }
818
819
820 void
821 JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
822 EC_TRACE(("[%s] # set frame pop - frame=%d",
823 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
824 fpop.frame_number() ));
825
826 ets->get_frame_pops()->set(fpop);
827 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
828 }
829
830
831 void
832 JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
833 EC_TRACE(("[%s] # clear frame pop - frame=%d",
834 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
835 fpop.frame_number() ));
836
837 ets->get_frame_pops()->clear(fpop);
838 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
839 }
840
841
842 void
843 JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
844 int cleared_cnt = ets->get_frame_pops()->clear_to(fpop);
845
846 EC_TRACE(("[%s] # clear to frame pop - frame=%d, count=%d",
847 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
848 fpop.frame_number(),
849 cleared_cnt ));
850
851 if (cleared_cnt > 0) {
852 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
853 }
854 }
855
856 void
857 JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) {
858 int *count_addr;
859
860 switch (event_type) {
861 case JVMTI_EVENT_FIELD_MODIFICATION:
862 count_addr = (int *)JvmtiExport::get_field_modification_count_addr();
863 break;
864 case JVMTI_EVENT_FIELD_ACCESS:
865 count_addr = (int *)JvmtiExport::get_field_access_count_addr();
866 break;
867 default:
868 assert(false, "incorrect event");
869 return;
870 }
871
872 EC_TRACE(("[-] # change field watch - %s %s count=%d",
873 event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access",
874 added? "add" : "remove",
875 *count_addr));
876
877 if (added) {
878 (*count_addr)++;
879 if (*count_addr == 1) {
880 recompute_enabled();
881 }
882 } else {
883 if (*count_addr > 0) {
884 (*count_addr)--;
885 if (*count_addr == 0) {
886 recompute_enabled();
887 }
888 } else {
889 assert(false, "field watch out of phase");
890 }
891 }
892 }
893
894 void
895 JvmtiEventControllerPrivate::event_init() {
896 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
897
898 if (_initialized) {
899 return;
900 }
901
902 EC_TRACE(("[-] # VM live"));
903
904 #ifdef ASSERT
905 // check that our idea and the spec's idea of threaded events match
906 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
907 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
908 assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei),
909 "thread filtered event list does not match");
910 }
911 #endif
912
913 _initialized = true;
914 }
915
916 void
917 JvmtiEventControllerPrivate::vm_start() {
918 // some events are now able to be enabled (phase has changed)
919 JvmtiEventControllerPrivate::recompute_enabled();
920 }
921
922
923 void
924 JvmtiEventControllerPrivate::vm_init() {
925 event_init();
926
927 // all the events are now able to be enabled (phase has changed)
928 JvmtiEventControllerPrivate::recompute_enabled();
929 }
930
931
932 void
933 JvmtiEventControllerPrivate::vm_death() {
934 // events are disabled (phase has changed)
935 JvmtiEventControllerPrivate::recompute_enabled();
936 }
937
938
939 ///////////////////////////////////////////////////////////////
940 //
941 // JvmtiEventController
942 //
943
944 JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled;
945
946 bool
947 JvmtiEventController::is_global_event(jvmtiEvent event_type) {
948 assert(is_valid_event_type(event_type), "invalid event type");
949 jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL);
950 return((bit_for & GLOBAL_EVENT_BITS)!=0);
951 }
952
953 void
954 JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) {
955 if (Threads::number_of_threads() == 0) {
956 // during early VM start-up locks don't exist, but we are safely single threaded,
957 // call the functionality without holding the JvmtiThreadState_lock.
958 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
959 } else {
960 MutexLocker mu(JvmtiThreadState_lock);
961 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
962 }
963 }
964
965
966 void
967 JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env,
968 const jvmtiEventCallbacks* callbacks,
969 jint size_of_callbacks) {
970 if (Threads::number_of_threads() == 0) {
971 // during early VM start-up locks don't exist, but we are safely single threaded,
972 // call the functionality without holding the JvmtiThreadState_lock.
973 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
974 } else {
975 MutexLocker mu(JvmtiThreadState_lock);
976 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
977 }
978 }
979
980 void
981 JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env,
982 jint extension_event_index,
983 jvmtiExtensionEvent callback) {
984 if (Threads::number_of_threads() == 0) {
985 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
986 } else {
987 MutexLocker mu(JvmtiThreadState_lock);
988 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
989 }
990 }
991
992
993
994
995 void
996 JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
997 MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
998 JvmtiEventControllerPrivate::set_frame_pop(ets, fpop);
999 }
1000
1001
1002 void
1003 JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1004 MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1005 JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop);
1006 }
1007
1008
1009 void
1010 JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1011 MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1012 JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop);
1013 }
1014
1015 void
1016 JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) {
1017 MutexLocker mu(JvmtiThreadState_lock);
1018 JvmtiEventControllerPrivate::change_field_watch(event_type, added);
1019 }
1020
1021 void
1022 JvmtiEventController::thread_started(JavaThread *thread) {
1023 // operates only on the current thread
1024 // JvmtiThreadState_lock grabbed only if needed.
1025 JvmtiEventControllerPrivate::thread_started(thread);
1026 }
1027
1028 void
1029 JvmtiEventController::thread_ended(JavaThread *thread) {
1030 // operates only on the current thread
1031 // JvmtiThreadState_lock grabbed only if needed.
1032 JvmtiEventControllerPrivate::thread_ended(thread);
1033 }
1034
1035 void
1036 JvmtiEventController::env_initialize(JvmtiEnvBase *env) {
1037 if (Threads::number_of_threads() == 0) {
1038 // during early VM start-up locks don't exist, but we are safely single threaded,
1039 // call the functionality without holding the JvmtiThreadState_lock.
1040 JvmtiEventControllerPrivate::env_initialize(env);
1041 } else {
1042 MutexLocker mu(JvmtiThreadState_lock);
1043 JvmtiEventControllerPrivate::env_initialize(env);
1044 }
1045 }
1046
1047 void
1048 JvmtiEventController::env_dispose(JvmtiEnvBase *env) {
1049 if (Threads::number_of_threads() == 0) {
1050 // during early VM start-up locks don't exist, but we are safely single threaded,
1051 // call the functionality without holding the JvmtiThreadState_lock.
1052 JvmtiEventControllerPrivate::env_dispose(env);
1053 } else {
1054 MutexLocker mu(JvmtiThreadState_lock);
1055 JvmtiEventControllerPrivate::env_dispose(env);
1056 }
1057 }
1058
1059
1060 void
1061 JvmtiEventController::vm_start() {
1062 if (JvmtiEnvBase::environments_might_exist()) {
1063 MutexLocker mu(JvmtiThreadState_lock);
1064 JvmtiEventControllerPrivate::vm_start();
1065 }
1066 }
1067
1068 void
1069 JvmtiEventController::vm_init() {
1070 if (JvmtiEnvBase::environments_might_exist()) {
1071 MutexLocker mu(JvmtiThreadState_lock);
1072 JvmtiEventControllerPrivate::vm_init();
1073 }
1074 }
1075
1076 void
1077 JvmtiEventController::vm_death() {
1078 if (JvmtiEnvBase::environments_might_exist()) {
1079 MutexLocker mu(JvmtiThreadState_lock);
1080 JvmtiEventControllerPrivate::vm_death();
1081 }
1082 }