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
56static const jlong SINGLE_STEP_BIT = (((jlong)1) << (JVMTI_EVENT_SINGLE_STEP - TOTAL_MIN_EVENT_TYPE_VAL));
57static const jlong FRAME_POP_BIT = (((jlong)1) << (JVMTI_EVENT_FRAME_POP - TOTAL_MIN_EVENT_TYPE_VAL));
58static const jlong BREAKPOINT_BIT = (((jlong)1) << (JVMTI_EVENT_BREAKPOINT - TOTAL_MIN_EVENT_TYPE_VAL));
59static const jlong FIELD_ACCESS_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_ACCESS - TOTAL_MIN_EVENT_TYPE_VAL));
60static const jlong FIELD_MODIFICATION_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_MODIFICATION - TOTAL_MIN_EVENT_TYPE_VAL));
61static const jlong METHOD_ENTRY_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_ENTRY - TOTAL_MIN_EVENT_TYPE_VAL));
62static const jlong METHOD_EXIT_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_EXIT - TOTAL_MIN_EVENT_TYPE_VAL));
63static const jlong CLASS_FILE_LOAD_HOOK_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_FILE_LOAD_HOOK - TOTAL_MIN_EVENT_TYPE_VAL));
64static const jlong NATIVE_METHOD_BIND_BIT = (((jlong)1) << (JVMTI_EVENT_NATIVE_METHOD_BIND - TOTAL_MIN_EVENT_TYPE_VAL));
65static const jlong VM_START_BIT = (((jlong)1) << (JVMTI_EVENT_VM_START - TOTAL_MIN_EVENT_TYPE_VAL));
66static const jlong VM_INIT_BIT = (((jlong)1) << (JVMTI_EVENT_VM_INIT - TOTAL_MIN_EVENT_TYPE_VAL));
67static const jlong VM_DEATH_BIT = (((jlong)1) << (JVMTI_EVENT_VM_DEATH - TOTAL_MIN_EVENT_TYPE_VAL));
68static const jlong CLASS_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_LOAD - TOTAL_MIN_EVENT_TYPE_VAL));
69static const jlong CLASS_PREPARE_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_PREPARE - TOTAL_MIN_EVENT_TYPE_VAL));
70static const jlong THREAD_START_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_START - TOTAL_MIN_EVENT_TYPE_VAL));
71static const jlong THREAD_END_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_END - TOTAL_MIN_EVENT_TYPE_VAL));
72static const jlong EXCEPTION_THROW_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION - TOTAL_MIN_EVENT_TYPE_VAL));
73static const jlong EXCEPTION_CATCH_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION_CATCH - TOTAL_MIN_EVENT_TYPE_VAL));
74static const jlong MONITOR_CONTENDED_ENTER_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTER - TOTAL_MIN_EVENT_TYPE_VAL));
75static const jlong MONITOR_CONTENDED_ENTERED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTERED - TOTAL_MIN_EVENT_TYPE_VAL));
76static const jlong MONITOR_WAIT_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAIT - TOTAL_MIN_EVENT_TYPE_VAL));
77static const jlong MONITOR_WAITED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAITED - TOTAL_MIN_EVENT_TYPE_VAL));
78static const jlong DYNAMIC_CODE_GENERATED_BIT = (((jlong)1) << (JVMTI_EVENT_DYNAMIC_CODE_GENERATED - TOTAL_MIN_EVENT_TYPE_VAL));
79static const jlong DATA_DUMP_BIT = (((jlong)1) << (JVMTI_EVENT_DATA_DUMP_REQUEST - TOTAL_MIN_EVENT_TYPE_VAL));
80static const jlong COMPILED_METHOD_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_LOAD - TOTAL_MIN_EVENT_TYPE_VAL));
81static const jlong COMPILED_METHOD_UNLOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
82static const jlong GARBAGE_COLLECTION_START_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_START - TOTAL_MIN_EVENT_TYPE_VAL));
83static const jlong GARBAGE_COLLECTION_FINISH_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_FINISH - TOTAL_MIN_EVENT_TYPE_VAL));
84static const jlong OBJECT_FREE_BIT = (((jlong)1) << (JVMTI_EVENT_OBJECT_FREE - TOTAL_MIN_EVENT_TYPE_VAL));
85static const jlong RESOURCE_EXHAUSTED_BIT = (((jlong)1) << (JVMTI_EVENT_RESOURCE_EXHAUSTED - TOTAL_MIN_EVENT_TYPE_VAL));
86static const jlong VM_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_VM_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL));
87static const jlong SAMPLED_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_SAMPLED_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL));
88
89// bits for extension events
90static const jlong CLASS_UNLOAD_BIT = (((jlong)1) << (EXT_EVENT_CLASS_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
91
92
93static const jlong MONITOR_BITS = MONITOR_CONTENDED_ENTER_BIT | MONITOR_CONTENDED_ENTERED_BIT |
94 MONITOR_WAIT_BIT | MONITOR_WAITED_BIT;
95static const jlong EXCEPTION_BITS = EXCEPTION_THROW_BIT | EXCEPTION_CATCH_BIT;
96static const jlong INTERP_EVENT_BITS = SINGLE_STEP_BIT | METHOD_ENTRY_BIT | METHOD_EXIT_BIT |
97 FRAME_POP_BIT | FIELD_ACCESS_BIT | FIELD_MODIFICATION_BIT;
98static 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;
101static const jlong NEED_THREAD_LIFE_EVENTS = THREAD_FILTERED_EVENT_BITS | THREAD_START_BIT;
102static 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;
107static const jlong GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS;
108static const jlong SHOULD_POST_ON_EXCEPTIONS_BITS = EXCEPTION_BITS | METHOD_EXIT_BIT | FRAME_POP_BIT;
109
110///////////////////////////////////////////////////////////////
111//
112// JvmtiEventEnabled
113//
114
115JvmtiEventEnabled::JvmtiEventEnabled() {
116 clear();
117}
118
119
120void JvmtiEventEnabled::clear() {
121 _enabled_bits = 0;
122#ifndef PRODUCT
123 _init_guard = JEE_INIT_GUARD;
124#endif
125}
126
127void 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
144JvmtiEnvThreadEventEnable::JvmtiEnvThreadEventEnable() {
145 _event_user_enabled.clear();
146 _event_enabled.clear();
147}
148
149
150JvmtiEnvThreadEventEnable::~JvmtiEnvThreadEventEnable() {
151 _event_user_enabled.clear();
152 _event_enabled.clear();
153}
154
155
156///////////////////////////////////////////////////////////////
157//
158// JvmtiThreadEventEnable
159//
160
161JvmtiThreadEventEnable::JvmtiThreadEventEnable() {
162 _event_enabled.clear();
163}
164
165
166JvmtiThreadEventEnable::~JvmtiThreadEventEnable() {
167 _event_enabled.clear();
168}
169
170
171///////////////////////////////////////////////////////////////
172//
173// JvmtiEnvEventEnable
174//
175
176JvmtiEnvEventEnable::JvmtiEnvEventEnable() {
177 _event_user_enabled.clear();
178 _event_callback_enabled.clear();
179 _event_enabled.clear();
180}
181
182
183JvmtiEnvEventEnable::~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
195class VM_EnterInterpOnlyMode : public VM_Operation {
196private:
197 JvmtiThreadState *_state;
198
199public:
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
212VM_EnterInterpOnlyMode::VM_EnterInterpOnlyMode(JvmtiThreadState *state)
213 : _state(state)
214{
215}
216
217
218void 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
254class VM_ChangeSingleStep : public VM_Operation {
255private:
256 bool _on;
257
258public:
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
266VM_ChangeSingleStep::VM_ChangeSingleStep(bool on)
267 : _on(on)
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
285class JvmtiEventControllerPrivate : public AllStatic {
286 static bool _initialized;
287public:
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
326bool JvmtiEventControllerPrivate::_initialized = false;
327
328void 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// When _on == true, we use the safepoint interpreter dispatch table
335// to allow us to find the single step points. Otherwise, we switch
336// back to the regular interpreter dispatch table.
337// Note: We call Interpreter::notice_safepoints() and ignore_safepoints()
338// in a VM_Operation to safely make the dispatch table switch. We
339// no longer rely on the safepoint mechanism to do any of this work
340// for us.
341void VM_ChangeSingleStep::doit() {
342 log_debug(interpreter, safepoint)("changing single step to '%s'", _on ? "on" : "off");
343 JvmtiEventControllerPrivate::set_should_post_single_step(_on);
344 if (_on) {
345 Interpreter::notice_safepoints();
346 } else {
347 Interpreter::ignore_safepoints();
348 }
349}
350
351
352void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) {
353 EC_TRACE(("[%s] # Entering interpreter only mode",
354 JvmtiTrace::safe_get_thread_name(state->get_thread())));
355
356 VM_EnterInterpOnlyMode op(state);
357 VMThread::execute(&op);
358}
359
360
361void
362JvmtiEventControllerPrivate::leave_interp_only_mode(JvmtiThreadState *state) {
363 EC_TRACE(("[%s] # Leaving interpreter only mode",
364 JvmtiTrace::safe_get_thread_name(state->get_thread())));
365 state->leave_interp_only_mode();
366}
367
368
369void
370JvmtiEventControllerPrivate::trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed) {
371#ifdef JVMTI_TRACE
372 if (JvmtiTrace::trace_event_controller()) {
373 SafeResourceMark rm;
374 // traces standard events only
375 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
376 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
377 if (changed & bit) {
378 // it changed, print it
379 log_trace(jvmti)("[%s] # %s event %s",
380 JvmtiTrace::safe_get_thread_name(state->get_thread()),
381 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
382 }
383 }
384 }
385#endif /*JVMTI_TRACE */
386}
387
388
389void
390JvmtiEventControllerPrivate::trace_changed(jlong now_enabled, jlong changed) {
391#ifdef JVMTI_TRACE
392 if (JvmtiTrace::trace_event_controller()) {
393 SafeResourceMark rm;
394 // traces standard events only
395 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
396 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
397 if (changed & bit) {
398 // it changed, print it
399 log_trace(jvmti)("[-] # %s event %s",
400 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
401 }
402 }
403 }
404#endif /*JVMTI_TRACE */
405}
406
407
408// For the specified env: compute the currently truly enabled events
409// set external state accordingly.
410// Return value and set value must include all events.
411// But outside this class, only non-thread-filtered events can be queried..
412jlong
413JvmtiEventControllerPrivate::recompute_env_enabled(JvmtiEnvBase* env) {
414 jlong was_enabled = env->env_event_enable()->_event_enabled.get_bits();
415 jlong now_enabled =
416 env->env_event_enable()->_event_callback_enabled.get_bits() &
417 env->env_event_enable()->_event_user_enabled.get_bits();
418
419 switch (env->phase()) {
420 case JVMTI_PHASE_PRIMORDIAL:
421 case JVMTI_PHASE_ONLOAD:
422 // only these events allowed in primordial or onload phase
423 now_enabled &= (EARLY_EVENT_BITS & ~THREAD_FILTERED_EVENT_BITS);
424 break;
425 case JVMTI_PHASE_START:
426 // only these events allowed in start phase
427 now_enabled &= EARLY_EVENT_BITS;
428 break;
429 case JVMTI_PHASE_LIVE:
430 // all events allowed during live phase
431 break;
432 case JVMTI_PHASE_DEAD:
433 // no events allowed when dead
434 now_enabled = 0;
435 break;
436 default:
437 assert(false, "no other phases - sanity check");
438 break;
439 }
440
441 // will we really send these events to this env
442 env->env_event_enable()->_event_enabled.set_bits(now_enabled);
443
444 trace_changed(now_enabled, (now_enabled ^ was_enabled) & ~THREAD_FILTERED_EVENT_BITS);
445
446 return now_enabled;
447}
448
449
450// For the specified env and thread: compute the currently truly enabled events
451// set external state accordingly. Only thread-filtered events are included.
452jlong
453JvmtiEventControllerPrivate::recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state) {
454 JvmtiEnv *env = ets->get_env();
455
456 jlong was_enabled = ets->event_enable()->_event_enabled.get_bits();
457 jlong now_enabled = THREAD_FILTERED_EVENT_BITS &
458 env->env_event_enable()->_event_callback_enabled.get_bits() &
459 (env->env_event_enable()->_event_user_enabled.get_bits() |
460 ets->event_enable()->_event_user_enabled.get_bits());
461
462 // for frame pops and field watchs, computed enabled state
463 // is only true if an event has been requested
464 if (!ets->has_frame_pops()) {
465 now_enabled &= ~FRAME_POP_BIT;
466 }
467 if (*((int *)JvmtiExport::get_field_access_count_addr()) == 0) {
468 now_enabled &= ~FIELD_ACCESS_BIT;
469 }
470 if (*((int *)JvmtiExport::get_field_modification_count_addr()) == 0) {
471 now_enabled &= ~FIELD_MODIFICATION_BIT;
472 }
473
474 switch (JvmtiEnv::get_phase()) {
475 case JVMTI_PHASE_DEAD:
476 // no events allowed when dead
477 now_enabled = 0;
478 break;
479 default:
480 break;
481 }
482
483 // if anything changed do update
484 if (now_enabled != was_enabled) {
485
486 // will we really send these events to this thread x env
487 ets->event_enable()->_event_enabled.set_bits(now_enabled);
488
489 // If the enabled status of the single step or breakpoint events changed,
490 // the location status may need to change as well.
491 jlong changed = now_enabled ^ was_enabled;
492 if (changed & SINGLE_STEP_BIT) {
493 ets->reset_current_location(JVMTI_EVENT_SINGLE_STEP, (now_enabled & SINGLE_STEP_BIT) != 0);
494 }
495 if (changed & BREAKPOINT_BIT) {
496 ets->reset_current_location(JVMTI_EVENT_BREAKPOINT, (now_enabled & BREAKPOINT_BIT) != 0);
497 }
498 trace_changed(state, now_enabled, changed);
499 }
500 return now_enabled;
501}
502
503
504// For the specified thread: compute the currently truly enabled events
505// set external state accordingly. Only thread-filtered events are included.
506jlong
507JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) {
508 if (state == NULL) {
509 // associated JavaThread is exiting
510 return (jlong)0;
511 }
512
513 julong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits();
514 julong any_env_enabled = 0;
515 // JVMTI_EVENT_FRAME_POP can be disabled (in the case FRAME_POP_BIT is not set),
516 // but we need to set interp_only if some JvmtiEnvThreadState has frame pop set
517 // to clear the request
518 bool has_frame_pops = false;
519
520 {
521 // This iteration will include JvmtiEnvThreadStates whose environments
522 // have been disposed. These JvmtiEnvThreadStates must not be filtered
523 // as recompute must be called on them to disable their events,
524 JvmtiEnvThreadStateIterator it(state);
525 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
526 any_env_enabled |= recompute_env_thread_enabled(ets, state);
527 has_frame_pops |= ets->has_frame_pops();
528 }
529 }
530
531 if (any_env_enabled != was_any_env_enabled) {
532 // mark if event is truly enabled on this thread in any environment
533 state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled);
534
535 // update the JavaThread cached value for thread-specific should_post_on_exceptions value
536 bool should_post_on_exceptions = (any_env_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0;
537 state->set_should_post_on_exceptions(should_post_on_exceptions);
538 }
539
540 // compute interp_only mode
541 bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0 || has_frame_pops;
542 bool is_now_interp = state->is_interp_only_mode();
543
544 if (should_be_interp != is_now_interp) {
545 if (should_be_interp) {
546 enter_interp_only_mode(state);
547 } else {
548 leave_interp_only_mode(state);
549 }
550 }
551
552 return any_env_enabled;
553}
554
555
556// Compute truly enabled events - meaning if the event can and could be
557// sent. An event is truly enabled if it is user enabled on the thread
558// or globally user enabled, but only if there is a callback or event hook
559// for it and, for field watch and frame pop, one has been set.
560// Compute if truly enabled, per thread, per environment, per combination
561// (thread x environment), and overall. These merges are true if any is true.
562// True per thread if some environment has callback set and the event is globally
563// enabled or enabled for this thread.
564// True per environment if the callback is set and the event is globally
565// enabled in this environment or enabled for any thread in this environment.
566// True per combination if the environment has the callback set and the
567// event is globally enabled in this environment or the event is enabled
568// for this thread and environment.
569//
570// All states transitions dependent on these transitions are also handled here.
571void
572JvmtiEventControllerPrivate::recompute_enabled() {
573 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
574
575 // event enabled for any thread in any environment
576 julong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits();
577 julong any_env_thread_enabled = 0;
578
579 EC_TRACE(("[-] # recompute enabled - before " JULONG_FORMAT_X, was_any_env_thread_enabled));
580
581 // compute non-thread-filters events.
582 // This must be done separately from thread-filtered events, since some
583 // events can occur before any threads exist.
584 JvmtiEnvIterator it;
585 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
586 any_env_thread_enabled |= recompute_env_enabled(env);
587 }
588
589 // We need to create any missing jvmti_thread_state if there are globally set thread
590 // filtered events and there weren't last time
591 if ( (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 &&
592 (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) {
593 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) {
594 // state_for_while_locked() makes tp->is_exiting() check
595 JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing
596 }
597 }
598
599 // compute and set thread-filtered events
600 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
601 any_env_thread_enabled |= recompute_thread_enabled(state);
602 }
603
604 // set universal state (across all envs and threads)
605 jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled;
606 if (delta != 0) {
607 JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0);
608 JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0);
609 JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0);
610 JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0);
611 JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0);
612 JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0);
613 JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0);
614 JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0);
615 JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0);
616 JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0);
617 JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0);
618 JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0);
619 JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0);
620 JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0);
621 JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0);
622 JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0);
623 JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0);
624 JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0);
625 JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0);
626 JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0);
627 JvmtiExport::set_should_post_sampled_object_alloc((any_env_thread_enabled & SAMPLED_OBJECT_ALLOC_BIT) != 0);
628
629 // need this if we want thread events or we need them to init data
630 JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0);
631
632 // If single stepping is turned on or off, execute the VM op to change it.
633 if (delta & SINGLE_STEP_BIT) {
634 switch (JvmtiEnv::get_phase()) {
635 case JVMTI_PHASE_DEAD:
636 // If the VM is dying we can't execute VM ops
637 break;
638 case JVMTI_PHASE_LIVE: {
639 VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0);
640 VMThread::execute(&op);
641 break;
642 }
643 default:
644 assert(false, "should never come here before live phase");
645 break;
646 }
647 }
648
649 // set global truly enabled, that is, any thread in any environment
650 JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled);
651
652 // set global should_post_on_exceptions
653 JvmtiExport::set_should_post_on_exceptions((any_env_thread_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0);
654
655 }
656
657 EC_TRACE(("[-] # recompute enabled - after " JULONG_FORMAT_X, any_env_thread_enabled));
658}
659
660
661void
662JvmtiEventControllerPrivate::thread_started(JavaThread *thread) {
663 assert(thread->is_Java_thread(), "Must be JavaThread");
664 assert(thread == Thread::current(), "must be current thread");
665 assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist");
666
667 EC_TRACE(("[%s] # thread started", JvmtiTrace::safe_get_thread_name(thread)));
668
669 // if we have any thread filtered events globally enabled, create/update the thread state
670 if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) {
671 MutexLocker mu(JvmtiThreadState_lock);
672 // create the thread state if missing
673 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
674 if (state != NULL) { // skip threads with no JVMTI thread state
675 recompute_thread_enabled(state);
676 }
677 }
678}
679
680
681void
682JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) {
683 // Removes the JvmtiThreadState associated with the specified thread.
684 // May be called after all environments have been disposed.
685 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
686
687 EC_TRACE(("[%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread)));
688
689 JvmtiThreadState *state = thread->jvmti_thread_state();
690 assert(state != NULL, "else why are we here?");
691 delete state;
692}
693
694void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env,
695 const jvmtiEventCallbacks* callbacks,
696 jint size_of_callbacks) {
697 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
698 EC_TRACE(("[*] # set event callbacks"));
699
700 env->set_event_callbacks(callbacks, size_of_callbacks);
701 jlong enabled_bits = 0;
702 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
703 jvmtiEvent evt_t = (jvmtiEvent)ei;
704 if (env->has_callback(evt_t)) {
705 enabled_bits |= JvmtiEventEnabled::bit_for(evt_t);
706 }
707 }
708 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
709 recompute_enabled();
710}
711
712void
713JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env,
714 jint extension_event_index,
715 jvmtiExtensionEvent callback)
716{
717 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
718 EC_TRACE(("[*] # set extension event callback"));
719
720 // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL
721 assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL &&
722 extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check");
723
724
725 // As the bits for both standard (jvmtiEvent) and extension
726 // (jvmtiExtEvents) are stored in the same word we cast here to
727 // jvmtiEvent to set/clear the bit for this extension event.
728 jvmtiEvent event_type = (jvmtiEvent)extension_event_index;
729
730 // Prevent a possible race condition where events are re-enabled by a call to
731 // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate
732 // environment check and before the lock is acquired.
733 // We can safely do the is_valid check now, as JvmtiThreadState_lock is held.
734 bool enabling = (callback != NULL) && (env->is_valid());
735 env->env_event_enable()->set_user_enabled(event_type, enabling);
736
737 // update the callback
738 jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks();
739 switch (extension_event_index) {
740 case EXT_EVENT_CLASS_UNLOAD :
741 ext_callbacks->ClassUnload = callback;
742 break;
743 default:
744 ShouldNotReachHere();
745 }
746
747 // update the callback enable/disable bit
748 jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits();
749 jlong bit_for = JvmtiEventEnabled::bit_for(event_type);
750 if (enabling) {
751 enabled_bits |= bit_for;
752 } else {
753 enabled_bits &= ~bit_for;
754 }
755 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
756
757 recompute_enabled();
758}
759
760
761void
762JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) {
763 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
764 EC_TRACE(("[*] # env initialize"));
765
766 if (JvmtiEnvBase::is_vm_live()) {
767 // if we didn't initialize event info already (this is a late
768 // launched environment), do it now.
769 event_init();
770 }
771
772 env->initialize();
773
774 // add the JvmtiEnvThreadState to each JvmtiThreadState
775 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
776 state->add_env(env);
777 assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check");
778 }
779 JvmtiEventControllerPrivate::recompute_enabled();
780}
781
782
783void
784JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) {
785 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
786 EC_TRACE(("[*] # env dispose"));
787
788 // Before the environment is marked disposed, disable all events on this
789 // environment (by zapping the callbacks). As a result, the disposed
790 // environment will not call event handlers.
791 set_event_callbacks(env, NULL, 0);
792 for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL;
793 extension_event_index <= EXT_MAX_EVENT_TYPE_VAL;
794 ++extension_event_index) {
795 set_extension_event_callback(env, extension_event_index, NULL);
796 }
797
798 // Let the environment finish disposing itself.
799 env->env_dispose();
800}
801
802
803void
804JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
805 jvmtiEvent event_type, bool enabled) {
806 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
807
808 EC_TRACE(("[%s] # user %s event %s",
809 thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread),
810 enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type)));
811
812 if (thread == NULL) {
813 env->env_event_enable()->set_user_enabled(event_type, enabled);
814 } else {
815 // create the thread state (if it didn't exist before)
816 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
817 if (state != NULL) {
818 state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled);
819 }
820 }
821 recompute_enabled();
822}
823
824
825void
826JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
827 EC_TRACE(("[%s] # set frame pop - frame=%d",
828 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
829 fpop.frame_number() ));
830
831 ets->get_frame_pops()->set(fpop);
832 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
833}
834
835
836void
837JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
838 EC_TRACE(("[%s] # clear frame pop - frame=%d",
839 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
840 fpop.frame_number() ));
841
842 ets->get_frame_pops()->clear(fpop);
843 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
844}
845
846
847void
848JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
849 int cleared_cnt = ets->get_frame_pops()->clear_to(fpop);
850
851 EC_TRACE(("[%s] # clear to frame pop - frame=%d, count=%d",
852 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
853 fpop.frame_number(),
854 cleared_cnt ));
855
856 if (cleared_cnt > 0) {
857 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
858 }
859}
860
861void
862JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) {
863 int *count_addr;
864
865 switch (event_type) {
866 case JVMTI_EVENT_FIELD_MODIFICATION:
867 count_addr = (int *)JvmtiExport::get_field_modification_count_addr();
868 break;
869 case JVMTI_EVENT_FIELD_ACCESS:
870 count_addr = (int *)JvmtiExport::get_field_access_count_addr();
871 break;
872 default:
873 assert(false, "incorrect event");
874 return;
875 }
876
877 EC_TRACE(("[-] # change field watch - %s %s count=%d",
878 event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access",
879 added? "add" : "remove",
880 *count_addr));
881
882 if (added) {
883 (*count_addr)++;
884 if (*count_addr == 1) {
885 recompute_enabled();
886 }
887 } else {
888 if (*count_addr > 0) {
889 (*count_addr)--;
890 if (*count_addr == 0) {
891 recompute_enabled();
892 }
893 } else {
894 assert(false, "field watch out of phase");
895 }
896 }
897}
898
899void
900JvmtiEventControllerPrivate::event_init() {
901 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
902
903 if (_initialized) {
904 return;
905 }
906
907 EC_TRACE(("[-] # VM live"));
908
909#ifdef ASSERT
910 // check that our idea and the spec's idea of threaded events match
911 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
912 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
913 assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei),
914 "thread filtered event list does not match");
915 }
916#endif
917
918 _initialized = true;
919}
920
921void
922JvmtiEventControllerPrivate::vm_start() {
923 // some events are now able to be enabled (phase has changed)
924 JvmtiEventControllerPrivate::recompute_enabled();
925}
926
927
928void
929JvmtiEventControllerPrivate::vm_init() {
930 event_init();
931
932 // all the events are now able to be enabled (phase has changed)
933 JvmtiEventControllerPrivate::recompute_enabled();
934}
935
936
937void
938JvmtiEventControllerPrivate::vm_death() {
939 // events are disabled (phase has changed)
940 JvmtiEventControllerPrivate::recompute_enabled();
941}
942
943
944///////////////////////////////////////////////////////////////
945//
946// JvmtiEventController
947//
948
949JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled;
950
951bool
952JvmtiEventController::is_global_event(jvmtiEvent event_type) {
953 assert(is_valid_event_type(event_type), "invalid event type");
954 jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL);
955 return((bit_for & GLOBAL_EVENT_BITS)!=0);
956}
957
958void
959JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) {
960 if (Threads::number_of_threads() == 0) {
961 // during early VM start-up locks don't exist, but we are safely single threaded,
962 // call the functionality without holding the JvmtiThreadState_lock.
963 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
964 } else {
965 MutexLocker mu(JvmtiThreadState_lock);
966 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
967 }
968}
969
970
971void
972JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env,
973 const jvmtiEventCallbacks* callbacks,
974 jint size_of_callbacks) {
975 if (Threads::number_of_threads() == 0) {
976 // during early VM start-up locks don't exist, but we are safely single threaded,
977 // call the functionality without holding the JvmtiThreadState_lock.
978 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
979 } else {
980 MutexLocker mu(JvmtiThreadState_lock);
981 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
982 }
983}
984
985void
986JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env,
987 jint extension_event_index,
988 jvmtiExtensionEvent callback) {
989 if (Threads::number_of_threads() == 0) {
990 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
991 } else {
992 MutexLocker mu(JvmtiThreadState_lock);
993 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
994 }
995}
996
997
998
999
1000void
1001JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1002 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1003 JvmtiEventControllerPrivate::set_frame_pop(ets, fpop);
1004}
1005
1006
1007void
1008JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1009 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1010 JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop);
1011}
1012
1013
1014void
1015JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1016 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1017 JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop);
1018}
1019
1020void
1021JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) {
1022 MutexLocker mu(JvmtiThreadState_lock);
1023 JvmtiEventControllerPrivate::change_field_watch(event_type, added);
1024}
1025
1026void
1027JvmtiEventController::thread_started(JavaThread *thread) {
1028 // operates only on the current thread
1029 // JvmtiThreadState_lock grabbed only if needed.
1030 JvmtiEventControllerPrivate::thread_started(thread);
1031}
1032
1033void
1034JvmtiEventController::thread_ended(JavaThread *thread) {
1035 // operates only on the current thread
1036 // JvmtiThreadState_lock grabbed only if needed.
1037 JvmtiEventControllerPrivate::thread_ended(thread);
1038}
1039
1040void
1041JvmtiEventController::env_initialize(JvmtiEnvBase *env) {
1042 if (Threads::number_of_threads() == 0) {
1043 // during early VM start-up locks don't exist, but we are safely single threaded,
1044 // call the functionality without holding the JvmtiThreadState_lock.
1045 JvmtiEventControllerPrivate::env_initialize(env);
1046 } else {
1047 MutexLocker mu(JvmtiThreadState_lock);
1048 JvmtiEventControllerPrivate::env_initialize(env);
1049 }
1050}
1051
1052void
1053JvmtiEventController::env_dispose(JvmtiEnvBase *env) {
1054 if (Threads::number_of_threads() == 0) {
1055 // during early VM start-up locks don't exist, but we are safely single threaded,
1056 // call the functionality without holding the JvmtiThreadState_lock.
1057 JvmtiEventControllerPrivate::env_dispose(env);
1058 } else {
1059 MutexLocker mu(JvmtiThreadState_lock);
1060 JvmtiEventControllerPrivate::env_dispose(env);
1061 }
1062}
1063
1064
1065void
1066JvmtiEventController::vm_start() {
1067 if (JvmtiEnvBase::environments_might_exist()) {
1068 MutexLocker mu(JvmtiThreadState_lock);
1069 JvmtiEventControllerPrivate::vm_start();
1070 }
1071}
1072
1073void
1074JvmtiEventController::vm_init() {
1075 if (JvmtiEnvBase::environments_might_exist()) {
1076 MutexLocker mu(JvmtiThreadState_lock);
1077 JvmtiEventControllerPrivate::vm_init();
1078 }
1079}
1080
1081void
1082JvmtiEventController::vm_death() {
1083 if (JvmtiEnvBase::environments_might_exist()) {
1084 MutexLocker mu(JvmtiThreadState_lock);
1085 JvmtiEventControllerPrivate::vm_death();
1086 }
1087}
1088