1 /*
2 * Copyright (c) 2003, 2019, 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/vmOperations.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 SAMPLED_OBJECT_ALLOC_BIT;
101 static const jlong NEED_THREAD_LIFE_EVENTS = THREAD_FILTERED_EVENT_BITS | THREAD_START_BIT;
102 static const jlong EARLY_EVENT_BITS = CLASS_FILE_LOAD_HOOK_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT |
103 VM_START_BIT | VM_INIT_BIT | VM_DEATH_BIT | NATIVE_METHOD_BIND_BIT |
104 THREAD_START_BIT | THREAD_END_BIT |
105 COMPILED_METHOD_LOAD_BIT | COMPILED_METHOD_UNLOAD_BIT |
106 DYNAMIC_CODE_GENERATED_BIT;
107 static const jlong GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS;
108 static const jlong SHOULD_POST_ON_EXCEPTIONS_BITS = EXCEPTION_BITS | METHOD_EXIT_BIT | FRAME_POP_BIT;
109
110 ///////////////////////////////////////////////////////////////
111 //
112 // JvmtiEventEnabled
113 //
114
115 JvmtiEventEnabled::JvmtiEventEnabled() {
116 clear();
117 }
118
119
120 void JvmtiEventEnabled::clear() {
121 _enabled_bits = 0;
122 #ifndef PRODUCT
123 _init_guard = JEE_INIT_GUARD;
124 #endif
125 }
126
127 void JvmtiEventEnabled::set_enabled(jvmtiEvent event_type, bool enabled) {
128 jlong bits = get_bits();
129 jlong mask = bit_for(event_type);
130 if (enabled) {
131 bits |= mask;
132 } else {
133 bits &= ~mask;
134 }
135 set_bits(bits);
136 }
137
138
139 ///////////////////////////////////////////////////////////////
140 //
141 // JvmtiEnvThreadEventEnable
142 //
143
144 JvmtiEnvThreadEventEnable::JvmtiEnvThreadEventEnable() {
145 _event_user_enabled.clear();
146 _event_enabled.clear();
147 }
148
149
150 JvmtiEnvThreadEventEnable::~JvmtiEnvThreadEventEnable() {
151 _event_user_enabled.clear();
152 _event_enabled.clear();
153 }
154
155
156 ///////////////////////////////////////////////////////////////
157 //
158 // JvmtiThreadEventEnable
159 //
160
161 JvmtiThreadEventEnable::JvmtiThreadEventEnable() {
162 _event_enabled.clear();
163 }
164
165
166 JvmtiThreadEventEnable::~JvmtiThreadEventEnable() {
167 _event_enabled.clear();
168 }
169
170
171 ///////////////////////////////////////////////////////////////
172 //
173 // JvmtiEnvEventEnable
174 //
175
176 JvmtiEnvEventEnable::JvmtiEnvEventEnable() {
177 _event_user_enabled.clear();
178 _event_callback_enabled.clear();
179 _event_enabled.clear();
180 }
181
182
183 JvmtiEnvEventEnable::~JvmtiEnvEventEnable() {
184 _event_user_enabled.clear();
185 _event_callback_enabled.clear();
186 _event_enabled.clear();
187 }
188
189
190 ///////////////////////////////////////////////////////////////
191 //
192 // VM_EnterInterpOnlyMode
193 //
194
195 class VM_EnterInterpOnlyMode : public VM_Operation {
196 private:
197 JvmtiThreadState *_state;
198
199 public:
200 VM_EnterInterpOnlyMode(JvmtiThreadState *state);
201
202 bool allow_nested_vm_operations() const { return true; }
203 VMOp_Type type() const { return VMOp_EnterInterpOnlyMode; }
204 void doit();
205
206 // to do: this same function is in jvmtiImpl - should be in one place
207 bool can_be_deoptimized(vframe* vf) {
208 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized());
209 }
210 };
211
212 VM_EnterInterpOnlyMode::VM_EnterInterpOnlyMode(JvmtiThreadState *state)
213 : _state(state)
214 {
215 }
216
217
218 void VM_EnterInterpOnlyMode::doit() {
219 // Set up the current stack depth for later tracking
220 _state->invalidate_cur_stack_depth();
221
222 _state->enter_interp_only_mode();
223
224 JavaThread *thread = _state->get_thread();
225 if (thread->has_last_Java_frame()) {
226 // If running in fullspeed mode, single stepping is implemented
227 // as follows: first, the interpreter does not dispatch to
228 // compiled code for threads that have single stepping enabled;
229 // second, we deoptimize all methods on the thread's stack when
230 // interpreted-only mode is enabled the first time for a given
231 // thread (nothing to do if no Java frames yet).
232 int num_marked = 0;
233 ResourceMark resMark;
234 RegisterMap rm(thread, false);
235 for (vframe* vf = thread->last_java_vframe(&rm); vf; vf = vf->sender()) {
236 if (can_be_deoptimized(vf)) {
237 ((compiledVFrame*) vf)->code()->mark_for_deoptimization();
238 ++num_marked;
239 }
240 }
241 if (num_marked > 0) {
242 VM_Deoptimize op;
243 VMThread::execute(&op);
244 }
245 }
246 }
247
248
249 ///////////////////////////////////////////////////////////////
250 //
251 // VM_ChangeSingleStep
252 //
253
254 class VM_ChangeSingleStep : public VM_Operation {
255 private:
256 bool _on;
257
258 public:
259 VM_ChangeSingleStep(bool on);
260 VMOp_Type type() const { return VMOp_ChangeSingleStep; }
261 bool allow_nested_vm_operations() const { return true; }
262 void doit(); // method definition is after definition of JvmtiEventControllerPrivate because of scoping
263 };
264
265
266 VM_ChangeSingleStep::VM_ChangeSingleStep(bool on)
267 : _on(on != 0)
268 {
269 }
270
271
272
273
274 ///////////////////////////////////////////////////////////////
275 //
276 // JvmtiEventControllerPrivate
277 //
278 // Private internal implementation methods for JvmtiEventController.
279 //
280 // These methods are thread safe either because they are called
281 // in early VM initialization which is single threaded, or they
282 // hold the JvmtiThreadState_lock.
283 //
284
285 class JvmtiEventControllerPrivate : public AllStatic {
286 static bool _initialized;
287 public:
288 static void set_should_post_single_step(bool on);
289 static void enter_interp_only_mode(JvmtiThreadState *state);
290 static void leave_interp_only_mode(JvmtiThreadState *state);
291 static void recompute_enabled();
292 static jlong recompute_env_enabled(JvmtiEnvBase* env);
293 static jlong recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state);
294 static jlong recompute_thread_enabled(JvmtiThreadState *state);
295 static void event_init();
296
297 static void set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
298 jvmtiEvent event_type, bool enabled);
299 static void set_event_callbacks(JvmtiEnvBase *env,
300 const jvmtiEventCallbacks* callbacks,
301 jint size_of_callbacks);
302
303 static void set_extension_event_callback(JvmtiEnvBase *env,
304 jint extension_event_index,
305 jvmtiExtensionEvent callback);
306
307 static void set_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
308 static void clear_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
309 static void clear_to_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
310 static void change_field_watch(jvmtiEvent event_type, bool added);
311
312 static void thread_started(JavaThread *thread);
313 static void thread_ended(JavaThread *thread);
314
315 static void env_initialize(JvmtiEnvBase *env);
316 static void env_dispose(JvmtiEnvBase *env);
317
318 static void vm_start();
319 static void vm_init();
320 static void vm_death();
321
322 static void trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed);
323 static void trace_changed(jlong now_enabled, jlong changed);
324 };
325
326 bool JvmtiEventControllerPrivate::_initialized = false;
327
328 void JvmtiEventControllerPrivate::set_should_post_single_step(bool on) {
329 // we have permission to do this, VM op doesn't
330 JvmtiExport::set_should_post_single_step(on);
331 }
332
333
334 // This change must always be occur when at a safepoint.
335 // Being at a safepoint causes the interpreter to use the
336 // safepoint dispatch table which we overload to find single
337 // step points. Just to be sure that it has been set, we
338 // call notice_safepoints when turning on single stepping.
339 // When we leave our current safepoint, should_post_single_step
340 // will be checked by the interpreter, and the table kept
341 // or changed accordingly.
342 void VM_ChangeSingleStep::doit() {
343 JvmtiEventControllerPrivate::set_should_post_single_step(_on);
344 if (_on) {
345 Interpreter::notice_safepoints();
346 }
347 }
348
349
350 void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) {
351 EC_TRACE(("[%s] # Entering interpreter only mode",
352 JvmtiTrace::safe_get_thread_name(state->get_thread())));
353
354 VM_EnterInterpOnlyMode op(state);
355 VMThread::execute(&op);
356 }
357
358
359 void
360 JvmtiEventControllerPrivate::leave_interp_only_mode(JvmtiThreadState *state) {
361 EC_TRACE(("[%s] # Leaving interpreter only mode",
362 JvmtiTrace::safe_get_thread_name(state->get_thread())));
363 state->leave_interp_only_mode();
364 }
365
366
367 void
368 JvmtiEventControllerPrivate::trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed) {
369 #ifdef JVMTI_TRACE
370 if (JvmtiTrace::trace_event_controller()) {
371 SafeResourceMark rm;
372 // traces standard events only
373 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
374 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
375 if (changed & bit) {
376 // it changed, print it
377 log_trace(jvmti)("[%s] # %s event %s",
378 JvmtiTrace::safe_get_thread_name(state->get_thread()),
379 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
380 }
381 }
382 }
383 #endif /*JVMTI_TRACE */
384 }
385
386
387 void
388 JvmtiEventControllerPrivate::trace_changed(jlong now_enabled, jlong changed) {
389 #ifdef JVMTI_TRACE
390 if (JvmtiTrace::trace_event_controller()) {
391 SafeResourceMark rm;
392 // traces standard events only
393 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
394 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
395 if (changed & bit) {
396 // it changed, print it
397 log_trace(jvmti)("[-] # %s event %s",
398 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
399 }
400 }
401 }
402 #endif /*JVMTI_TRACE */
403 }
404
405
406 // For the specified env: compute the currently truly enabled events
407 // set external state accordingly.
408 // Return value and set value must include all events.
409 // But outside this class, only non-thread-filtered events can be queried..
410 jlong
411 JvmtiEventControllerPrivate::recompute_env_enabled(JvmtiEnvBase* env) {
412 jlong was_enabled = env->env_event_enable()->_event_enabled.get_bits();
413 jlong now_enabled =
414 env->env_event_enable()->_event_callback_enabled.get_bits() &
415 env->env_event_enable()->_event_user_enabled.get_bits();
416
417 switch (env->phase()) {
418 case JVMTI_PHASE_PRIMORDIAL:
419 case JVMTI_PHASE_ONLOAD:
420 // only these events allowed in primordial or onload phase
421 now_enabled &= (EARLY_EVENT_BITS & ~THREAD_FILTERED_EVENT_BITS);
422 break;
423 case JVMTI_PHASE_START:
424 // only these events allowed in start phase
425 now_enabled &= EARLY_EVENT_BITS;
426 break;
427 case JVMTI_PHASE_LIVE:
428 // all events allowed during live phase
429 break;
430 case JVMTI_PHASE_DEAD:
431 // no events allowed when dead
432 now_enabled = 0;
433 break;
434 default:
435 assert(false, "no other phases - sanity check");
436 break;
437 }
438
439 // will we really send these events to this env
440 env->env_event_enable()->_event_enabled.set_bits(now_enabled);
441
442 trace_changed(now_enabled, (now_enabled ^ was_enabled) & ~THREAD_FILTERED_EVENT_BITS);
443
444 return now_enabled;
445 }
446
447
448 // For the specified env and thread: compute the currently truly enabled events
449 // set external state accordingly. Only thread-filtered events are included.
450 jlong
451 JvmtiEventControllerPrivate::recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state) {
452 JvmtiEnv *env = ets->get_env();
453
454 jlong was_enabled = ets->event_enable()->_event_enabled.get_bits();
455 jlong now_enabled = THREAD_FILTERED_EVENT_BITS &
456 env->env_event_enable()->_event_callback_enabled.get_bits() &
457 (env->env_event_enable()->_event_user_enabled.get_bits() |
458 ets->event_enable()->_event_user_enabled.get_bits());
459
460 // for frame pops and field watchs, computed enabled state
461 // is only true if an event has been requested
462 if (!ets->has_frame_pops()) {
463 now_enabled &= ~FRAME_POP_BIT;
464 }
465 if (*((int *)JvmtiExport::get_field_access_count_addr()) == 0) {
466 now_enabled &= ~FIELD_ACCESS_BIT;
467 }
468 if (*((int *)JvmtiExport::get_field_modification_count_addr()) == 0) {
469 now_enabled &= ~FIELD_MODIFICATION_BIT;
470 }
471
472 switch (JvmtiEnv::get_phase()) {
473 case JVMTI_PHASE_DEAD:
474 // no events allowed when dead
475 now_enabled = 0;
476 break;
477 default:
478 break;
479 }
480
481 // if anything changed do update
482 if (now_enabled != was_enabled) {
483
484 // will we really send these events to this thread x env
485 ets->event_enable()->_event_enabled.set_bits(now_enabled);
486
487 // If the enabled status of the single step or breakpoint events changed,
488 // the location status may need to change as well.
489 jlong changed = now_enabled ^ was_enabled;
490 if (changed & SINGLE_STEP_BIT) {
491 ets->reset_current_location(JVMTI_EVENT_SINGLE_STEP, (now_enabled & SINGLE_STEP_BIT) != 0);
492 }
493 if (changed & BREAKPOINT_BIT) {
494 ets->reset_current_location(JVMTI_EVENT_BREAKPOINT, (now_enabled & BREAKPOINT_BIT) != 0);
495 }
496 trace_changed(state, now_enabled, changed);
497 }
498 return now_enabled;
499 }
500
501
502 // For the specified thread: compute the currently truly enabled events
503 // set external state accordingly. Only thread-filtered events are included.
504 jlong
505 JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) {
506 if (state == NULL) {
507 // associated JavaThread is exiting
508 return (jlong)0;
509 }
510
511 julong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits();
512 julong any_env_enabled = 0;
513 // JVMTI_EVENT_FRAME_POP can be disabled (in the case FRAME_POP_BIT is not set),
514 // but we need to set interp_only if some JvmtiEnvThreadState has frame pop set
515 // to clear the request
516 bool has_frame_pops = false;
517
518 {
519 // This iteration will include JvmtiEnvThreadStates whose environments
520 // have been disposed. These JvmtiEnvThreadStates must not be filtered
521 // as recompute must be called on them to disable their events,
522 JvmtiEnvThreadStateIterator it(state);
523 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
524 any_env_enabled |= recompute_env_thread_enabled(ets, state);
525 has_frame_pops |= ets->has_frame_pops();
526 }
527 }
528
529 if (any_env_enabled != was_any_env_enabled) {
530 // mark if event is truly enabled on this thread in any environment
531 state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled);
532
533 // update the JavaThread cached value for thread-specific should_post_on_exceptions value
534 bool should_post_on_exceptions = (any_env_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0;
535 state->set_should_post_on_exceptions(should_post_on_exceptions);
536 }
537
538 // compute interp_only mode
539 bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0 || has_frame_pops;
540 bool is_now_interp = state->is_interp_only_mode();
541
542 if (should_be_interp != is_now_interp) {
543 if (should_be_interp) {
544 enter_interp_only_mode(state);
545 } else {
546 leave_interp_only_mode(state);
547 }
548 }
549
550 return any_env_enabled;
551 }
552
553
554 // Compute truly enabled events - meaning if the event can and could be
555 // sent. An event is truly enabled if it is user enabled on the thread
556 // or globally user enabled, but only if there is a callback or event hook
557 // for it and, for field watch and frame pop, one has been set.
558 // Compute if truly enabled, per thread, per environment, per combination
559 // (thread x environment), and overall. These merges are true if any is true.
560 // True per thread if some environment has callback set and the event is globally
561 // enabled or enabled for this thread.
562 // True per environment if the callback is set and the event is globally
563 // enabled in this environment or enabled for any thread in this environment.
564 // True per combination if the environment has the callback set and the
565 // event is globally enabled in this environment or the event is enabled
566 // for this thread and environment.
567 //
568 // All states transitions dependent on these transitions are also handled here.
569 void
570 JvmtiEventControllerPrivate::recompute_enabled() {
571 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
572
573 // event enabled for any thread in any environment
574 julong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits();
575 julong any_env_thread_enabled = 0;
576
577 EC_TRACE(("[-] # recompute enabled - before " JULONG_FORMAT_X, was_any_env_thread_enabled));
578
579 // compute non-thread-filters events.
580 // This must be done separately from thread-filtered events, since some
581 // events can occur before any threads exist.
582 JvmtiEnvIterator it;
583 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
584 any_env_thread_enabled |= recompute_env_enabled(env);
585 }
586
587 // We need to create any missing jvmti_thread_state if there are globally set thread
588 // filtered events and there weren't last time
589 if ( (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 &&
590 (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) {
591 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) {
592 // state_for_while_locked() makes tp->is_exiting() check
593 JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing
594 }
595 }
596
597 // compute and set thread-filtered events
598 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
599 any_env_thread_enabled |= recompute_thread_enabled(state);
600 }
601
602 // set universal state (across all envs and threads)
603 jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled;
604 if (delta != 0) {
605 JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0);
606 JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0);
607 JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0);
608 JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0);
609 JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0);
610 JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0);
611 JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0);
612 JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0);
613 JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0);
614 JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0);
615 JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0);
616 JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0);
617 JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0);
618 JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0);
619 JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0);
620 JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0);
621 JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0);
622 JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0);
623 JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0);
624 JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0);
625 JvmtiExport::set_should_post_sampled_object_alloc((any_env_thread_enabled & SAMPLED_OBJECT_ALLOC_BIT) != 0);
626
627 // need this if we want thread events or we need them to init data
628 JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0);
629
630 // If single stepping is turned on or off, execute the VM op to change it.
631 if (delta & SINGLE_STEP_BIT) {
632 switch (JvmtiEnv::get_phase()) {
633 case JVMTI_PHASE_DEAD:
634 // If the VM is dying we can't execute VM ops
635 break;
636 case JVMTI_PHASE_LIVE: {
637 VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0);
638 VMThread::execute(&op);
639 break;
640 }
641 default:
642 assert(false, "should never come here before live phase");
643 break;
644 }
645 }
646
647 // set global truly enabled, that is, any thread in any environment
648 JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled);
649
650 // set global should_post_on_exceptions
651 JvmtiExport::set_should_post_on_exceptions((any_env_thread_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0);
652
653 }
654
655 EC_TRACE(("[-] # recompute enabled - after " JULONG_FORMAT_X, any_env_thread_enabled));
656 }
657
658
659 void
660 JvmtiEventControllerPrivate::thread_started(JavaThread *thread) {
661 assert(thread->is_Java_thread(), "Must be JavaThread");
662 assert(thread == Thread::current(), "must be current thread");
663 assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist");
664
665 EC_TRACE(("[%s] # thread started", JvmtiTrace::safe_get_thread_name(thread)));
666
667 // if we have any thread filtered events globally enabled, create/update the thread state
668 if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) {
669 MutexLocker mu(JvmtiThreadState_lock);
670 // create the thread state if missing
671 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
672 if (state != NULL) { // skip threads with no JVMTI thread state
673 recompute_thread_enabled(state);
674 }
675 }
676 }
677
678
679 void
680 JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) {
681 // Removes the JvmtiThreadState associated with the specified thread.
682 // May be called after all environments have been disposed.
683 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
684
685 EC_TRACE(("[%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread)));
686
687 JvmtiThreadState *state = thread->jvmti_thread_state();
688 assert(state != NULL, "else why are we here?");
689 delete state;
690 }
691
692 void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env,
693 const jvmtiEventCallbacks* callbacks,
694 jint size_of_callbacks) {
695 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
696 EC_TRACE(("[*] # set event callbacks"));
697
698 env->set_event_callbacks(callbacks, size_of_callbacks);
699 jlong enabled_bits = 0;
700 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
701 jvmtiEvent evt_t = (jvmtiEvent)ei;
702 if (env->has_callback(evt_t)) {
703 enabled_bits |= JvmtiEventEnabled::bit_for(evt_t);
704 }
705 }
706 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
707 recompute_enabled();
708 }
709
710 void
711 JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env,
712 jint extension_event_index,
713 jvmtiExtensionEvent callback)
714 {
715 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
716 EC_TRACE(("[*] # set extension event callback"));
717
718 // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL
719 assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL &&
720 extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check");
721
722
723 // As the bits for both standard (jvmtiEvent) and extension
724 // (jvmtiExtEvents) are stored in the same word we cast here to
725 // jvmtiEvent to set/clear the bit for this extension event.
726 jvmtiEvent event_type = (jvmtiEvent)extension_event_index;
727
728 // Prevent a possible race condition where events are re-enabled by a call to
729 // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate
730 // environment check and before the lock is acquired.
731 // We can safely do the is_valid check now, as JvmtiThreadState_lock is held.
732 bool enabling = (callback != NULL) && (env->is_valid());
733 env->env_event_enable()->set_user_enabled(event_type, enabling);
734
735 // update the callback
736 jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks();
737 switch (extension_event_index) {
738 case EXT_EVENT_CLASS_UNLOAD :
739 ext_callbacks->ClassUnload = callback;
740 break;
741 default:
742 ShouldNotReachHere();
743 }
744
745 // update the callback enable/disable bit
746 jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits();
747 jlong bit_for = JvmtiEventEnabled::bit_for(event_type);
748 if (enabling) {
749 enabled_bits |= bit_for;
750 } else {
751 enabled_bits &= ~bit_for;
752 }
753 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
754
755 recompute_enabled();
756 }
757
758
759 void
760 JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) {
761 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
762 EC_TRACE(("[*] # env initialize"));
763
764 if (JvmtiEnvBase::is_vm_live()) {
765 // if we didn't initialize event info already (this is a late
766 // launched environment), do it now.
767 event_init();
768 }
769
770 env->initialize();
771
772 // add the JvmtiEnvThreadState to each JvmtiThreadState
773 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
774 state->add_env(env);
775 assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check");
776 }
777 JvmtiEventControllerPrivate::recompute_enabled();
778 }
779
780
781 void
782 JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) {
783 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
784 EC_TRACE(("[*] # env dispose"));
785
786 // Before the environment is marked disposed, disable all events on this
787 // environment (by zapping the callbacks). As a result, the disposed
788 // environment will not call event handlers.
789 set_event_callbacks(env, NULL, 0);
790 for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL;
791 extension_event_index <= EXT_MAX_EVENT_TYPE_VAL;
792 ++extension_event_index) {
793 set_extension_event_callback(env, extension_event_index, NULL);
794 }
795
796 // Let the environment finish disposing itself.
797 env->env_dispose();
798 }
799
800
801 void
802 JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
803 jvmtiEvent event_type, bool enabled) {
804 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
805
806 EC_TRACE(("[%s] # user %s event %s",
807 thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread),
808 enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type)));
809
810 if (thread == NULL) {
811 env->env_event_enable()->set_user_enabled(event_type, enabled);
812 } else {
813 // create the thread state (if it didn't exist before)
814 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
815 if (state != NULL) {
816 state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled);
817 }
818 }
819 recompute_enabled();
820 }
821
822
823 void
824 JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
825 EC_TRACE(("[%s] # set frame pop - frame=%d",
826 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
827 fpop.frame_number() ));
828
829 ets->get_frame_pops()->set(fpop);
830 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
831 }
832
833
834 void
835 JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
836 EC_TRACE(("[%s] # clear frame pop - frame=%d",
837 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
838 fpop.frame_number() ));
839
840 ets->get_frame_pops()->clear(fpop);
841 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
842 }
843
844
845 void
846 JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
847 int cleared_cnt = ets->get_frame_pops()->clear_to(fpop);
848
849 EC_TRACE(("[%s] # clear to frame pop - frame=%d, count=%d",
850 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
851 fpop.frame_number(),
852 cleared_cnt ));
853
854 if (cleared_cnt > 0) {
855 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
856 }
857 }
858
859 void
860 JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) {
861 int *count_addr;
862
863 switch (event_type) {
864 case JVMTI_EVENT_FIELD_MODIFICATION:
865 count_addr = (int *)JvmtiExport::get_field_modification_count_addr();
866 break;
867 case JVMTI_EVENT_FIELD_ACCESS:
868 count_addr = (int *)JvmtiExport::get_field_access_count_addr();
869 break;
870 default:
871 assert(false, "incorrect event");
872 return;
873 }
874
875 EC_TRACE(("[-] # change field watch - %s %s count=%d",
876 event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access",
877 added? "add" : "remove",
878 *count_addr));
879
880 if (added) {
881 (*count_addr)++;
882 if (*count_addr == 1) {
883 recompute_enabled();
884 }
885 } else {
886 if (*count_addr > 0) {
887 (*count_addr)--;
888 if (*count_addr == 0) {
889 recompute_enabled();
890 }
891 } else {
892 assert(false, "field watch out of phase");
893 }
894 }
895 }
896
897 void
898 JvmtiEventControllerPrivate::event_init() {
899 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
900
901 if (_initialized) {
902 return;
903 }
904
905 EC_TRACE(("[-] # VM live"));
906
907 #ifdef ASSERT
908 // check that our idea and the spec's idea of threaded events match
909 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
910 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
911 assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei),
912 "thread filtered event list does not match");
913 }
914 #endif
915
916 _initialized = true;
917 }
918
919 void
920 JvmtiEventControllerPrivate::vm_start() {
921 // some events are now able to be enabled (phase has changed)
922 JvmtiEventControllerPrivate::recompute_enabled();
923 }
924
925
926 void
927 JvmtiEventControllerPrivate::vm_init() {
928 event_init();
929
930 // all the events are now able to be enabled (phase has changed)
931 JvmtiEventControllerPrivate::recompute_enabled();
932 }
933
934
935 void
936 JvmtiEventControllerPrivate::vm_death() {
937 // events are disabled (phase has changed)
938 JvmtiEventControllerPrivate::recompute_enabled();
939 }
940
941
942 ///////////////////////////////////////////////////////////////
943 //
944 // JvmtiEventController
945 //
946
947 JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled;
948
949 bool
950 JvmtiEventController::is_global_event(jvmtiEvent event_type) {
951 assert(is_valid_event_type(event_type), "invalid event type");
952 jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL);
953 return((bit_for & GLOBAL_EVENT_BITS)!=0);
954 }
955
956 void
957 JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) {
958 if (Threads::number_of_threads() == 0) {
959 // during early VM start-up locks don't exist, but we are safely single threaded,
960 // call the functionality without holding the JvmtiThreadState_lock.
961 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
962 } else {
963 MutexLocker mu(JvmtiThreadState_lock);
964 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
965 }
966 }
967
968
969 void
970 JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env,
971 const jvmtiEventCallbacks* callbacks,
972 jint size_of_callbacks) {
973 if (Threads::number_of_threads() == 0) {
974 // during early VM start-up locks don't exist, but we are safely single threaded,
975 // call the functionality without holding the JvmtiThreadState_lock.
976 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
977 } else {
978 MutexLocker mu(JvmtiThreadState_lock);
979 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
980 }
981 }
982
983 void
984 JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env,
985 jint extension_event_index,
986 jvmtiExtensionEvent callback) {
987 if (Threads::number_of_threads() == 0) {
988 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
989 } else {
990 MutexLocker mu(JvmtiThreadState_lock);
991 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
992 }
993 }
994
995
996
997
998 void
999 JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1000 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1001 JvmtiEventControllerPrivate::set_frame_pop(ets, fpop);
1002 }
1003
1004
1005 void
1006 JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1007 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1008 JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop);
1009 }
1010
1011
1012 void
1013 JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1014 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1015 JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop);
1016 }
1017
1018 void
1019 JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) {
1020 MutexLocker mu(JvmtiThreadState_lock);
1021 JvmtiEventControllerPrivate::change_field_watch(event_type, added);
1022 }
1023
1024 void
1025 JvmtiEventController::thread_started(JavaThread *thread) {
1026 // operates only on the current thread
1027 // JvmtiThreadState_lock grabbed only if needed.
1028 JvmtiEventControllerPrivate::thread_started(thread);
1029 }
1030
1031 void
1032 JvmtiEventController::thread_ended(JavaThread *thread) {
1033 // operates only on the current thread
1034 // JvmtiThreadState_lock grabbed only if needed.
1035 JvmtiEventControllerPrivate::thread_ended(thread);
1036 }
1037
1038 void
1039 JvmtiEventController::env_initialize(JvmtiEnvBase *env) {
1040 if (Threads::number_of_threads() == 0) {
1041 // during early VM start-up locks don't exist, but we are safely single threaded,
1042 // call the functionality without holding the JvmtiThreadState_lock.
1043 JvmtiEventControllerPrivate::env_initialize(env);
1044 } else {
1045 MutexLocker mu(JvmtiThreadState_lock);
1046 JvmtiEventControllerPrivate::env_initialize(env);
1047 }
1048 }
1049
1050 void
1051 JvmtiEventController::env_dispose(JvmtiEnvBase *env) {
1052 if (Threads::number_of_threads() == 0) {
1053 // during early VM start-up locks don't exist, but we are safely single threaded,
1054 // call the functionality without holding the JvmtiThreadState_lock.
1055 JvmtiEventControllerPrivate::env_dispose(env);
1056 } else {
1057 MutexLocker mu(JvmtiThreadState_lock);
1058 JvmtiEventControllerPrivate::env_dispose(env);
1059 }
1060 }
1061
1062
1063 void
1064 JvmtiEventController::vm_start() {
1065 if (JvmtiEnvBase::environments_might_exist()) {
1066 MutexLocker mu(JvmtiThreadState_lock);
1067 JvmtiEventControllerPrivate::vm_start();
1068 }
1069 }
1070
1071 void
1072 JvmtiEventController::vm_init() {
1073 if (JvmtiEnvBase::environments_might_exist()) {
1074 MutexLocker mu(JvmtiThreadState_lock);
1075 JvmtiEventControllerPrivate::vm_init();
1076 }
1077 }
1078
1079 void
1080 JvmtiEventController::vm_death() {
1081 if (JvmtiEnvBase::environments_might_exist()) {
1082 MutexLocker mu(JvmtiThreadState_lock);
1083 JvmtiEventControllerPrivate::vm_death();
1084 }
1085 }