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 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 // JVMTI_EVENT_FRAME_POP can be disabled (in the case FRAME_POP_BIT is not set),
513 // but we need to set interp_only if some JvmtiEnvThreadState has frame pop set
514 // to clear the request
515 bool has_frame_pops = false;
516
517 {
518 // This iteration will include JvmtiEnvThreadStates whose environments
519 // have been disposed. These JvmtiEnvThreadStates must not be filtered
520 // as recompute must be called on them to disable their events,
521 JvmtiEnvThreadStateIterator it(state);
522 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
523 any_env_enabled |= recompute_env_thread_enabled(ets, state);
524 has_frame_pops |= ets->has_frame_pops();
525 }
526 }
527
528 if (any_env_enabled != was_any_env_enabled) {
529 // mark if event is truly enabled on this thread in any environment
530 state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled);
531
532 // update the JavaThread cached value for thread-specific should_post_on_exceptions value
533 bool should_post_on_exceptions = (any_env_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0;
534 state->set_should_post_on_exceptions(should_post_on_exceptions);
535 }
536
537 // compute interp_only mode
538 bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0 || has_frame_pops;
539 bool is_now_interp = state->is_interp_only_mode();
540
541 if (should_be_interp != is_now_interp) {
542 if (should_be_interp) {
543 enter_interp_only_mode(state);
544 } else {
545 leave_interp_only_mode(state);
546 }
547 }
548
549 return any_env_enabled;
550 }
551
552
553 // Compute truly enabled events - meaning if the event can and could be
554 // sent. An event is truly enabled if it is user enabled on the thread
555 // or globally user enabled, but only if there is a callback or event hook
556 // for it and, for field watch and frame pop, one has been set.
557 // Compute if truly enabled, per thread, per environment, per combination
558 // (thread x environment), and overall. These merges are true if any is true.
559 // True per thread if some environment has callback set and the event is globally
560 // enabled or enabled for this thread.
561 // True per environment if the callback is set and the event is globally
562 // enabled in this environment or enabled for any thread in this environment.
563 // True per combination if the environment has the callback set and the
564 // event is globally enabled in this environment or the event is enabled
565 // for this thread and environment.
566 //
567 // All states transitions dependent on these transitions are also handled here.
568 void
569 JvmtiEventControllerPrivate::recompute_enabled() {
570 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
571
572 // event enabled for any thread in any environment
573 julong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits();
574 julong any_env_thread_enabled = 0;
575
576 EC_TRACE(("[-] # recompute enabled - before " JULONG_FORMAT_X, was_any_env_thread_enabled));
577
578 // compute non-thread-filters events.
579 // This must be done separately from thread-filtered events, since some
580 // events can occur before any threads exist.
581 JvmtiEnvIterator it;
582 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
583 any_env_thread_enabled |= recompute_env_enabled(env);
584 }
585
586 // We need to create any missing jvmti_thread_state if there are globally set thread
587 // filtered events and there weren't last time
588 if ( (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 &&
589 (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) {
590 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) {
591 // state_for_while_locked() makes tp->is_exiting() check
592 JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing
593 }
594 }
595
596 // compute and set thread-filtered events
597 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
598 any_env_thread_enabled |= recompute_thread_enabled(state);
599 }
600
601 // set universal state (across all envs and threads)
602 jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled;
603 if (delta != 0) {
604 JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0);
605 JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0);
606 JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0);
607 JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0);
608 JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0);
609 JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0);
610 JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0);
611 JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0);
612 JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0);
613 JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0);
614 JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0);
615 JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0);
616 JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0);
617 JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0);
618 JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0);
619 JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0);
620 JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0);
621 JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0);
622 JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0);
623 JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0);
624 JvmtiExport::set_should_post_sampled_object_alloc((any_env_thread_enabled & SAMPLED_OBJECT_ALLOC_BIT) != 0);
625
626 // need this if we want thread events or we need them to init data
627 JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0);
628
629 // If single stepping is turned on or off, execute the VM op to change it.
630 if (delta & SINGLE_STEP_BIT) {
631 switch (JvmtiEnv::get_phase()) {
632 case JVMTI_PHASE_DEAD:
633 // If the VM is dying we can't execute VM ops
634 break;
635 case JVMTI_PHASE_LIVE: {
636 VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0);
637 VMThread::execute(&op);
638 break;
639 }
640 default:
641 assert(false, "should never come here before live phase");
642 break;
643 }
644 }
645
646 // set global truly enabled, that is, any thread in any environment
647 JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled);
648
649 // set global should_post_on_exceptions
650 JvmtiExport::set_should_post_on_exceptions((any_env_thread_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0);
651
652 }
653
654 EC_TRACE(("[-] # recompute enabled - after " JULONG_FORMAT_X, any_env_thread_enabled));
655 }
656
657
658 void
659 JvmtiEventControllerPrivate::thread_started(JavaThread *thread) {
660 assert(thread->is_Java_thread(), "Must be JavaThread");
661 assert(thread == Thread::current(), "must be current thread");
662 assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist");
663
664 EC_TRACE(("[%s] # thread started", JvmtiTrace::safe_get_thread_name(thread)));
665
666 // if we have any thread filtered events globally enabled, create/update the thread state
667 if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) {
668 MutexLocker mu(JvmtiThreadState_lock);
669 // create the thread state if missing
670 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
671 if (state != NULL) { // skip threads with no JVMTI thread state
672 recompute_thread_enabled(state);
673 }
674 }
675 }
676
677
678 void
679 JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) {
680 // Removes the JvmtiThreadState associated with the specified thread.
681 // May be called after all environments have been disposed.
682 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
683
684 EC_TRACE(("[%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread)));
685
686 JvmtiThreadState *state = thread->jvmti_thread_state();
687 assert(state != NULL, "else why are we here?");
688 delete state;
689 }
690
691 void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env,
692 const jvmtiEventCallbacks* callbacks,
693 jint size_of_callbacks) {
694 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
695 EC_TRACE(("[*] # set event callbacks"));
696
697 env->set_event_callbacks(callbacks, size_of_callbacks);
698 jlong enabled_bits = 0;
699 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
700 jvmtiEvent evt_t = (jvmtiEvent)ei;
701 if (env->has_callback(evt_t)) {
702 enabled_bits |= JvmtiEventEnabled::bit_for(evt_t);
703 }
704 }
705 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
706 recompute_enabled();
707 }
708
709 void
710 JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env,
711 jint extension_event_index,
712 jvmtiExtensionEvent callback)
713 {
714 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
715 EC_TRACE(("[*] # set extension event callback"));
716
717 // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL
718 assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL &&
719 extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check");
720
721
722 // As the bits for both standard (jvmtiEvent) and extension
723 // (jvmtiExtEvents) are stored in the same word we cast here to
724 // jvmtiEvent to set/clear the bit for this extension event.
725 jvmtiEvent event_type = (jvmtiEvent)extension_event_index;
726
727 // Prevent a possible race condition where events are re-enabled by a call to
728 // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate
729 // environment check and before the lock is acquired.
730 // We can safely do the is_valid check now, as JvmtiThreadState_lock is held.
731 bool enabling = (callback != NULL) && (env->is_valid());
732 env->env_event_enable()->set_user_enabled(event_type, enabling);
733
734 // update the callback
735 jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks();
736 switch (extension_event_index) {
737 case EXT_EVENT_CLASS_UNLOAD :
738 ext_callbacks->ClassUnload = callback;
739 break;
740 default:
741 ShouldNotReachHere();
742 }
743
744 // update the callback enable/disable bit
745 jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits();
746 jlong bit_for = JvmtiEventEnabled::bit_for(event_type);
747 if (enabling) {
748 enabled_bits |= bit_for;
749 } else {
750 enabled_bits &= ~bit_for;
751 }
752 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
753
754 recompute_enabled();
755 }
756
757
758 void
759 JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) {
760 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
761 EC_TRACE(("[*] # env initialize"));
762
763 if (JvmtiEnvBase::is_vm_live()) {
764 // if we didn't initialize event info already (this is a late
765 // launched environment), do it now.
766 event_init();
767 }
768
769 env->initialize();
770
771 // add the JvmtiEnvThreadState to each JvmtiThreadState
772 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
773 state->add_env(env);
774 assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check");
775 }
776 JvmtiEventControllerPrivate::recompute_enabled();
777 }
778
779
780 void
781 JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) {
782 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
783 EC_TRACE(("[*] # env dispose"));
784
785 // Before the environment is marked disposed, disable all events on this
786 // environment (by zapping the callbacks). As a result, the disposed
787 // environment will not call event handlers.
788 set_event_callbacks(env, NULL, 0);
789 for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL;
790 extension_event_index <= EXT_MAX_EVENT_TYPE_VAL;
791 ++extension_event_index) {
792 set_extension_event_callback(env, extension_event_index, NULL);
793 }
794
795 // Let the environment finish disposing itself.
796 env->env_dispose();
797 }
798
799
800 void
801 JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
802 jvmtiEvent event_type, bool enabled) {
803 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
804
805 EC_TRACE(("[%s] # user %s event %s",
806 thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread),
807 enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type)));
808
809 if (thread == NULL) {
810 env->env_event_enable()->set_user_enabled(event_type, enabled);
811 } else {
812 // create the thread state (if it didn't exist before)
813 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
814 if (state != NULL) {
815 state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled);
816 }
817 }
818 recompute_enabled();
819 }
820
821
822 void
823 JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
824 EC_TRACE(("[%s] # set frame pop - frame=%d",
825 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
826 fpop.frame_number() ));
827
828 ets->get_frame_pops()->set(fpop);
829 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
830 }
831
832
833 void
834 JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
835 EC_TRACE(("[%s] # clear frame pop - frame=%d",
836 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
837 fpop.frame_number() ));
838
839 ets->get_frame_pops()->clear(fpop);
840 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
841 }
842
843
844 void
845 JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
846 int cleared_cnt = ets->get_frame_pops()->clear_to(fpop);
847
848 EC_TRACE(("[%s] # clear to frame pop - frame=%d, count=%d",
849 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
850 fpop.frame_number(),
851 cleared_cnt ));
852
853 if (cleared_cnt > 0) {
854 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
855 }
856 }
857
858 void
859 JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) {
860 int *count_addr;
861
862 switch (event_type) {
863 case JVMTI_EVENT_FIELD_MODIFICATION:
864 count_addr = (int *)JvmtiExport::get_field_modification_count_addr();
865 break;
866 case JVMTI_EVENT_FIELD_ACCESS:
867 count_addr = (int *)JvmtiExport::get_field_access_count_addr();
868 break;
869 default:
870 assert(false, "incorrect event");
871 return;
872 }
873
874 EC_TRACE(("[-] # change field watch - %s %s count=%d",
875 event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access",
876 added? "add" : "remove",
877 *count_addr));
878
879 if (added) {
880 (*count_addr)++;
881 if (*count_addr == 1) {
882 recompute_enabled();
883 }
884 } else {
885 if (*count_addr > 0) {
886 (*count_addr)--;
887 if (*count_addr == 0) {
888 recompute_enabled();
889 }
890 } else {
891 assert(false, "field watch out of phase");
892 }
893 }
894 }
895
896 void
897 JvmtiEventControllerPrivate::event_init() {
898 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
899
900 if (_initialized) {
901 return;
902 }
903
904 EC_TRACE(("[-] # VM live"));
905
906 #ifdef ASSERT
907 // check that our idea and the spec's idea of threaded events match
908 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
909 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
910 assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei),
911 "thread filtered event list does not match");
912 }
913 #endif
914
915 _initialized = true;
916 }
917
918 void
919 JvmtiEventControllerPrivate::vm_start() {
920 // some events are now able to be enabled (phase has changed)
921 JvmtiEventControllerPrivate::recompute_enabled();
922 }
923
924
925 void
926 JvmtiEventControllerPrivate::vm_init() {
927 event_init();
928
929 // all the events are now able to be enabled (phase has changed)
930 JvmtiEventControllerPrivate::recompute_enabled();
931 }
932
933
934 void
935 JvmtiEventControllerPrivate::vm_death() {
936 // events are disabled (phase has changed)
937 JvmtiEventControllerPrivate::recompute_enabled();
938 }
939
940
941 ///////////////////////////////////////////////////////////////
942 //
943 // JvmtiEventController
944 //
945
946 JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled;
947
948 bool
949 JvmtiEventController::is_global_event(jvmtiEvent event_type) {
950 assert(is_valid_event_type(event_type), "invalid event type");
951 jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL);
952 return((bit_for & GLOBAL_EVENT_BITS)!=0);
953 }
954
955 void
956 JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) {
957 if (Threads::number_of_threads() == 0) {
958 // during early VM start-up locks don't exist, but we are safely single threaded,
959 // call the functionality without holding the JvmtiThreadState_lock.
960 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
961 } else {
962 MutexLocker mu(JvmtiThreadState_lock);
963 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
964 }
965 }
966
967
968 void
969 JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env,
970 const jvmtiEventCallbacks* callbacks,
971 jint size_of_callbacks) {
972 if (Threads::number_of_threads() == 0) {
973 // during early VM start-up locks don't exist, but we are safely single threaded,
974 // call the functionality without holding the JvmtiThreadState_lock.
975 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
976 } else {
977 MutexLocker mu(JvmtiThreadState_lock);
978 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
979 }
980 }
981
982 void
983 JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env,
984 jint extension_event_index,
985 jvmtiExtensionEvent callback) {
986 if (Threads::number_of_threads() == 0) {
987 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
988 } else {
989 MutexLocker mu(JvmtiThreadState_lock);
990 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
991 }
992 }
993
994
995
996
997 void
998 JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
999 MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1000 JvmtiEventControllerPrivate::set_frame_pop(ets, fpop);
1001 }
1002
1003
1004 void
1005 JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1006 MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1007 JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop);
1008 }
1009
1010
1011 void
1012 JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1013 MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1014 JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop);
1015 }
1016
1017 void
1018 JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) {
1019 MutexLocker mu(JvmtiThreadState_lock);
1020 JvmtiEventControllerPrivate::change_field_watch(event_type, added);
1021 }
1022
1023 void
1024 JvmtiEventController::thread_started(JavaThread *thread) {
1025 // operates only on the current thread
1026 // JvmtiThreadState_lock grabbed only if needed.
1027 JvmtiEventControllerPrivate::thread_started(thread);
1028 }
1029
1030 void
1031 JvmtiEventController::thread_ended(JavaThread *thread) {
1032 // operates only on the current thread
1033 // JvmtiThreadState_lock grabbed only if needed.
1034 JvmtiEventControllerPrivate::thread_ended(thread);
1035 }
1036
1037 void
1038 JvmtiEventController::env_initialize(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_initialize(env);
1043 } else {
1044 MutexLocker mu(JvmtiThreadState_lock);
1045 JvmtiEventControllerPrivate::env_initialize(env);
1046 }
1047 }
1048
1049 void
1050 JvmtiEventController::env_dispose(JvmtiEnvBase *env) {
1051 if (Threads::number_of_threads() == 0) {
1052 // during early VM start-up locks don't exist, but we are safely single threaded,
1053 // call the functionality without holding the JvmtiThreadState_lock.
1054 JvmtiEventControllerPrivate::env_dispose(env);
1055 } else {
1056 MutexLocker mu(JvmtiThreadState_lock);
1057 JvmtiEventControllerPrivate::env_dispose(env);
1058 }
1059 }
1060
1061
1062 void
1063 JvmtiEventController::vm_start() {
1064 if (JvmtiEnvBase::environments_might_exist()) {
1065 MutexLocker mu(JvmtiThreadState_lock);
1066 JvmtiEventControllerPrivate::vm_start();
1067 }
1068 }
1069
1070 void
1071 JvmtiEventController::vm_init() {
1072 if (JvmtiEnvBase::environments_might_exist()) {
1073 MutexLocker mu(JvmtiThreadState_lock);
1074 JvmtiEventControllerPrivate::vm_init();
1075 }
1076 }
1077
1078 void
1079 JvmtiEventController::vm_death() {
1080 if (JvmtiEnvBase::environments_might_exist()) {
1081 MutexLocker mu(JvmtiThreadState_lock);
1082 JvmtiEventControllerPrivate::vm_death();
1083 }
1084 }