1 /*
2 * Copyright (c) 2003, 2020, 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/deoptimization.hpp"
36 #include "runtime/frame.inline.hpp"
37 #include "runtime/thread.inline.hpp"
38 #include "runtime/threadSMR.hpp"
39 #include "runtime/vframe.hpp"
40 #include "runtime/vframe_hp.hpp"
41 #include "runtime/vmThread.hpp"
42 #include "runtime/vmOperations.hpp"
43
44 #ifdef JVMTI_TRACE
45 #define EC_TRACE(out) do { \
46 if (JvmtiTrace::trace_event_controller()) { \
47 SafeResourceMark rm; \
48 log_trace(jvmti) out; \
49 } \
50 } while (0)
51 #else
52 #define EC_TRACE(out)
53 #endif /*JVMTI_TRACE */
54
55 // bits for standard events
56
57 static const jlong SINGLE_STEP_BIT = (((jlong)1) << (JVMTI_EVENT_SINGLE_STEP - TOTAL_MIN_EVENT_TYPE_VAL));
58 static const jlong FRAME_POP_BIT = (((jlong)1) << (JVMTI_EVENT_FRAME_POP - TOTAL_MIN_EVENT_TYPE_VAL));
59 static const jlong BREAKPOINT_BIT = (((jlong)1) << (JVMTI_EVENT_BREAKPOINT - TOTAL_MIN_EVENT_TYPE_VAL));
60 static const jlong FIELD_ACCESS_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_ACCESS - TOTAL_MIN_EVENT_TYPE_VAL));
61 static const jlong FIELD_MODIFICATION_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_MODIFICATION - TOTAL_MIN_EVENT_TYPE_VAL));
62 static const jlong METHOD_ENTRY_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_ENTRY - TOTAL_MIN_EVENT_TYPE_VAL));
63 static const jlong METHOD_EXIT_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_EXIT - TOTAL_MIN_EVENT_TYPE_VAL));
64 static const jlong CLASS_FILE_LOAD_HOOK_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_FILE_LOAD_HOOK - TOTAL_MIN_EVENT_TYPE_VAL));
65 static const jlong NATIVE_METHOD_BIND_BIT = (((jlong)1) << (JVMTI_EVENT_NATIVE_METHOD_BIND - TOTAL_MIN_EVENT_TYPE_VAL));
66 static const jlong VM_START_BIT = (((jlong)1) << (JVMTI_EVENT_VM_START - TOTAL_MIN_EVENT_TYPE_VAL));
67 static const jlong VM_INIT_BIT = (((jlong)1) << (JVMTI_EVENT_VM_INIT - TOTAL_MIN_EVENT_TYPE_VAL));
68 static const jlong VM_DEATH_BIT = (((jlong)1) << (JVMTI_EVENT_VM_DEATH - TOTAL_MIN_EVENT_TYPE_VAL));
69 static const jlong CLASS_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_LOAD - TOTAL_MIN_EVENT_TYPE_VAL));
70 static const jlong CLASS_PREPARE_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_PREPARE - TOTAL_MIN_EVENT_TYPE_VAL));
71 static const jlong THREAD_START_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_START - TOTAL_MIN_EVENT_TYPE_VAL));
72 static const jlong THREAD_END_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_END - TOTAL_MIN_EVENT_TYPE_VAL));
73 static const jlong EXCEPTION_THROW_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION - TOTAL_MIN_EVENT_TYPE_VAL));
74 static const jlong EXCEPTION_CATCH_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION_CATCH - TOTAL_MIN_EVENT_TYPE_VAL));
75 static const jlong MONITOR_CONTENDED_ENTER_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTER - TOTAL_MIN_EVENT_TYPE_VAL));
76 static const jlong MONITOR_CONTENDED_ENTERED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTERED - TOTAL_MIN_EVENT_TYPE_VAL));
77 static const jlong MONITOR_WAIT_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAIT - TOTAL_MIN_EVENT_TYPE_VAL));
78 static const jlong MONITOR_WAITED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAITED - TOTAL_MIN_EVENT_TYPE_VAL));
79 static const jlong DYNAMIC_CODE_GENERATED_BIT = (((jlong)1) << (JVMTI_EVENT_DYNAMIC_CODE_GENERATED - TOTAL_MIN_EVENT_TYPE_VAL));
80 static const jlong DATA_DUMP_BIT = (((jlong)1) << (JVMTI_EVENT_DATA_DUMP_REQUEST - TOTAL_MIN_EVENT_TYPE_VAL));
81 static const jlong COMPILED_METHOD_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_LOAD - TOTAL_MIN_EVENT_TYPE_VAL));
82 static const jlong COMPILED_METHOD_UNLOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
83 static const jlong GARBAGE_COLLECTION_START_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_START - TOTAL_MIN_EVENT_TYPE_VAL));
84 static const jlong GARBAGE_COLLECTION_FINISH_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_FINISH - TOTAL_MIN_EVENT_TYPE_VAL));
85 static const jlong OBJECT_FREE_BIT = (((jlong)1) << (JVMTI_EVENT_OBJECT_FREE - TOTAL_MIN_EVENT_TYPE_VAL));
86 static const jlong RESOURCE_EXHAUSTED_BIT = (((jlong)1) << (JVMTI_EVENT_RESOURCE_EXHAUSTED - TOTAL_MIN_EVENT_TYPE_VAL));
87 static const jlong VM_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_VM_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL));
88 static const jlong SAMPLED_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_SAMPLED_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL));
89
90 // bits for extension events
91 static const jlong CLASS_UNLOAD_BIT = (((jlong)1) << (EXT_EVENT_CLASS_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
92
93
94 static const jlong MONITOR_BITS = MONITOR_CONTENDED_ENTER_BIT | MONITOR_CONTENDED_ENTERED_BIT |
95 MONITOR_WAIT_BIT | MONITOR_WAITED_BIT;
96 static const jlong EXCEPTION_BITS = EXCEPTION_THROW_BIT | EXCEPTION_CATCH_BIT;
97 static const jlong INTERP_EVENT_BITS = SINGLE_STEP_BIT | METHOD_ENTRY_BIT | METHOD_EXIT_BIT |
98 FRAME_POP_BIT | FIELD_ACCESS_BIT | FIELD_MODIFICATION_BIT;
99 static const jlong THREAD_FILTERED_EVENT_BITS = INTERP_EVENT_BITS | EXCEPTION_BITS | MONITOR_BITS |
100 BREAKPOINT_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | THREAD_END_BIT |
101 SAMPLED_OBJECT_ALLOC_BIT;
102 static const jlong NEED_THREAD_LIFE_EVENTS = THREAD_FILTERED_EVENT_BITS | THREAD_START_BIT;
103 static const jlong EARLY_EVENT_BITS = CLASS_FILE_LOAD_HOOK_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT |
104 VM_START_BIT | VM_INIT_BIT | VM_DEATH_BIT | NATIVE_METHOD_BIND_BIT |
105 THREAD_START_BIT | THREAD_END_BIT |
106 COMPILED_METHOD_LOAD_BIT | COMPILED_METHOD_UNLOAD_BIT |
107 DYNAMIC_CODE_GENERATED_BIT;
108 static const jlong GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS;
109 static const jlong SHOULD_POST_ON_EXCEPTIONS_BITS = EXCEPTION_BITS | METHOD_EXIT_BIT | FRAME_POP_BIT;
110
111 ///////////////////////////////////////////////////////////////
112 //
113 // JvmtiEventEnabled
114 //
115
116 JvmtiEventEnabled::JvmtiEventEnabled() {
117 clear();
118 }
119
120
121 void JvmtiEventEnabled::clear() {
122 _enabled_bits = 0;
123 #ifndef PRODUCT
124 _init_guard = JEE_INIT_GUARD;
125 #endif
126 }
127
128 void JvmtiEventEnabled::set_enabled(jvmtiEvent event_type, bool enabled) {
129 jlong bits = get_bits();
130 jlong mask = bit_for(event_type);
131 if (enabled) {
132 bits |= mask;
133 } else {
134 bits &= ~mask;
135 }
136 set_bits(bits);
137 }
138
139
140 ///////////////////////////////////////////////////////////////
141 //
142 // JvmtiEnvThreadEventEnable
143 //
144
145 JvmtiEnvThreadEventEnable::JvmtiEnvThreadEventEnable() {
146 _event_user_enabled.clear();
147 _event_enabled.clear();
148 }
149
150
151 JvmtiEnvThreadEventEnable::~JvmtiEnvThreadEventEnable() {
152 _event_user_enabled.clear();
153 _event_enabled.clear();
154 }
155
156
157 ///////////////////////////////////////////////////////////////
158 //
159 // JvmtiThreadEventEnable
160 //
161
162 JvmtiThreadEventEnable::JvmtiThreadEventEnable() {
163 _event_enabled.clear();
164 }
165
166
167 JvmtiThreadEventEnable::~JvmtiThreadEventEnable() {
168 _event_enabled.clear();
169 }
170
171
172 ///////////////////////////////////////////////////////////////
173 //
174 // JvmtiEnvEventEnable
175 //
176
177 JvmtiEnvEventEnable::JvmtiEnvEventEnable() {
178 _event_user_enabled.clear();
179 _event_callback_enabled.clear();
180 _event_enabled.clear();
181 }
182
183
184 JvmtiEnvEventEnable::~JvmtiEnvEventEnable() {
185 _event_user_enabled.clear();
186 _event_callback_enabled.clear();
187 _event_enabled.clear();
188 }
189
190
191 ///////////////////////////////////////////////////////////////
192 //
193 // EnterInterpOnlyModeClosure
194 //
195
196 class EnterInterpOnlyModeClosure : public HandshakeClosure {
197
198 public:
199 EnterInterpOnlyModeClosure() : HandshakeClosure("EnterInterpOnlyMode") { }
200 void do_thread(Thread* th) {
201 JavaThread* jt = (JavaThread*) th;
202 JvmtiThreadState* state = jt->jvmti_thread_state();
203
204 // Set up the current stack depth for later tracking
205 state->invalidate_cur_stack_depth();
206
207 state->enter_interp_only_mode();
208
209 if (jt->has_last_Java_frame()) {
210 // If running in fullspeed mode, single stepping is implemented
211 // as follows: first, the interpreter does not dispatch to
212 // compiled code for threads that have single stepping enabled;
213 // second, we deoptimize all compiled java frames on the thread's stack when
214 // interpreted-only mode is enabled the first time for a given
215 // thread (nothing to do if no Java frames yet).
216 ResourceMark resMark;
217 for (StackFrameStream fst(jt, false); !fst.is_done(); fst.next()) {
218 if (fst.current()->can_be_deoptimized()) {
219 Deoptimization::deoptimize(jt, *fst.current());
220 }
221 }
222 }
223 }
224 };
225
226
227 ///////////////////////////////////////////////////////////////
228 //
229 // VM_ChangeSingleStep
230 //
231
232 class VM_ChangeSingleStep : public VM_Operation {
233 private:
234 bool _on;
235
236 public:
237 VM_ChangeSingleStep(bool on);
238 VMOp_Type type() const { return VMOp_ChangeSingleStep; }
239 bool allow_nested_vm_operations() const { return true; }
240 void doit(); // method definition is after definition of JvmtiEventControllerPrivate because of scoping
241 };
242
243
244 VM_ChangeSingleStep::VM_ChangeSingleStep(bool on)
245 : _on(on)
246 {
247 }
248
249
250
251
252 ///////////////////////////////////////////////////////////////
253 //
254 // JvmtiEventControllerPrivate
255 //
256 // Private internal implementation methods for JvmtiEventController.
257 //
258 // These methods are thread safe either because they are called
259 // in early VM initialization which is single threaded, or they
260 // hold the JvmtiThreadState_lock.
261 //
262
263 class JvmtiEventControllerPrivate : public AllStatic {
264 static bool _initialized;
265 public:
266 static void set_should_post_single_step(bool on);
267 static void enter_interp_only_mode(JvmtiThreadState *state);
268 static void leave_interp_only_mode(JvmtiThreadState *state);
269 static void recompute_enabled();
270 static jlong recompute_env_enabled(JvmtiEnvBase* env);
271 static jlong recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state);
272 static jlong recompute_thread_enabled(JvmtiThreadState *state);
273 static void event_init();
274
275 static void set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
276 jvmtiEvent event_type, bool enabled);
277 static void set_event_callbacks(JvmtiEnvBase *env,
278 const jvmtiEventCallbacks* callbacks,
279 jint size_of_callbacks);
280
281 static void set_extension_event_callback(JvmtiEnvBase *env,
282 jint extension_event_index,
283 jvmtiExtensionEvent callback);
284
285 static void set_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
286 static void clear_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
287 static void clear_to_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
288 static void change_field_watch(jvmtiEvent event_type, bool added);
289
290 static void thread_started(JavaThread *thread);
291 static void thread_ended(JavaThread *thread);
292
293 static void env_initialize(JvmtiEnvBase *env);
294 static void env_dispose(JvmtiEnvBase *env);
295
296 static void vm_start();
297 static void vm_init();
298 static void vm_death();
299
300 static void trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed);
301 static void trace_changed(jlong now_enabled, jlong changed);
302 };
303
304 bool JvmtiEventControllerPrivate::_initialized = false;
305
306 void JvmtiEventControllerPrivate::set_should_post_single_step(bool on) {
307 // we have permission to do this, VM op doesn't
308 JvmtiExport::set_should_post_single_step(on);
309 }
310
311
312 // When _on == true, we use the safepoint interpreter dispatch table
313 // to allow us to find the single step points. Otherwise, we switch
314 // back to the regular interpreter dispatch table.
315 // Note: We call Interpreter::notice_safepoints() and ignore_safepoints()
316 // in a VM_Operation to safely make the dispatch table switch. We
317 // no longer rely on the safepoint mechanism to do any of this work
318 // for us.
319 void VM_ChangeSingleStep::doit() {
320 log_debug(interpreter, safepoint)("changing single step to '%s'", _on ? "on" : "off");
321 JvmtiEventControllerPrivate::set_should_post_single_step(_on);
322 if (_on) {
323 Interpreter::notice_safepoints();
324 } else {
325 Interpreter::ignore_safepoints();
326 }
327 }
328
329
330 void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) {
331 EC_TRACE(("[%s] # Entering interpreter only mode",
332 JvmtiTrace::safe_get_thread_name(state->get_thread())));
333 EnterInterpOnlyModeClosure hs;
334 assert(state->get_thread()->is_Java_thread(), "just checking");
335 JavaThread *target = (JavaThread *)state->get_thread();
336 Thread *current = Thread::current();
337 if ((target == current) || (target->active_handshaker() == current)) {
338 hs.do_thread(target);
339 } else {
340 Handshake::execute_direct(&hs, target);
341 }
342 }
343
344
345 void
346 JvmtiEventControllerPrivate::leave_interp_only_mode(JvmtiThreadState *state) {
347 EC_TRACE(("[%s] # Leaving interpreter only mode",
348 JvmtiTrace::safe_get_thread_name(state->get_thread())));
349 state->leave_interp_only_mode();
350 }
351
352
353 void
354 JvmtiEventControllerPrivate::trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed) {
355 #ifdef JVMTI_TRACE
356 if (JvmtiTrace::trace_event_controller()) {
357 SafeResourceMark rm;
358 // traces standard events only
359 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
360 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
361 if (changed & bit) {
362 // it changed, print it
363 log_trace(jvmti)("[%s] # %s event %s",
364 JvmtiTrace::safe_get_thread_name(state->get_thread()),
365 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
366 }
367 }
368 }
369 #endif /*JVMTI_TRACE */
370 }
371
372
373 void
374 JvmtiEventControllerPrivate::trace_changed(jlong now_enabled, jlong changed) {
375 #ifdef JVMTI_TRACE
376 if (JvmtiTrace::trace_event_controller()) {
377 SafeResourceMark rm;
378 // traces standard events only
379 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
380 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
381 if (changed & bit) {
382 // it changed, print it
383 log_trace(jvmti)("[-] # %s event %s",
384 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
385 }
386 }
387 }
388 #endif /*JVMTI_TRACE */
389 }
390
391
392 // For the specified env: compute the currently truly enabled events
393 // set external state accordingly.
394 // Return value and set value must include all events.
395 // But outside this class, only non-thread-filtered events can be queried..
396 jlong
397 JvmtiEventControllerPrivate::recompute_env_enabled(JvmtiEnvBase* env) {
398 jlong was_enabled = env->env_event_enable()->_event_enabled.get_bits();
399 jlong now_enabled =
400 env->env_event_enable()->_event_callback_enabled.get_bits() &
401 env->env_event_enable()->_event_user_enabled.get_bits();
402
403 switch (env->phase()) {
404 case JVMTI_PHASE_PRIMORDIAL:
405 case JVMTI_PHASE_ONLOAD:
406 // only these events allowed in primordial or onload phase
407 now_enabled &= (EARLY_EVENT_BITS & ~THREAD_FILTERED_EVENT_BITS);
408 break;
409 case JVMTI_PHASE_START:
410 // only these events allowed in start phase
411 now_enabled &= EARLY_EVENT_BITS;
412 break;
413 case JVMTI_PHASE_LIVE:
414 // all events allowed during live phase
415 break;
416 case JVMTI_PHASE_DEAD:
417 // no events allowed when dead
418 now_enabled = 0;
419 break;
420 default:
421 assert(false, "no other phases - sanity check");
422 break;
423 }
424
425 // will we really send these events to this env
426 env->env_event_enable()->_event_enabled.set_bits(now_enabled);
427
428 trace_changed(now_enabled, (now_enabled ^ was_enabled) & ~THREAD_FILTERED_EVENT_BITS);
429
430 return now_enabled;
431 }
432
433
434 // For the specified env and thread: compute the currently truly enabled events
435 // set external state accordingly. Only thread-filtered events are included.
436 jlong
437 JvmtiEventControllerPrivate::recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state) {
438 JvmtiEnv *env = ets->get_env();
439
440 jlong was_enabled = ets->event_enable()->_event_enabled.get_bits();
441 jlong now_enabled = THREAD_FILTERED_EVENT_BITS &
442 env->env_event_enable()->_event_callback_enabled.get_bits() &
443 (env->env_event_enable()->_event_user_enabled.get_bits() |
444 ets->event_enable()->_event_user_enabled.get_bits());
445
446 // for frame pops and field watchs, computed enabled state
447 // is only true if an event has been requested
448 if (!ets->has_frame_pops()) {
449 now_enabled &= ~FRAME_POP_BIT;
450 }
451 if (*((int *)JvmtiExport::get_field_access_count_addr()) == 0) {
452 now_enabled &= ~FIELD_ACCESS_BIT;
453 }
454 if (*((int *)JvmtiExport::get_field_modification_count_addr()) == 0) {
455 now_enabled &= ~FIELD_MODIFICATION_BIT;
456 }
457
458 switch (JvmtiEnv::get_phase()) {
459 case JVMTI_PHASE_DEAD:
460 // no events allowed when dead
461 now_enabled = 0;
462 break;
463 default:
464 break;
465 }
466
467 // if anything changed do update
468 if (now_enabled != was_enabled) {
469
470 // will we really send these events to this thread x env
471 ets->event_enable()->_event_enabled.set_bits(now_enabled);
472
473 // If the enabled status of the single step or breakpoint events changed,
474 // the location status may need to change as well.
475 jlong changed = now_enabled ^ was_enabled;
476 if (changed & SINGLE_STEP_BIT) {
477 ets->reset_current_location(JVMTI_EVENT_SINGLE_STEP, (now_enabled & SINGLE_STEP_BIT) != 0);
478 }
479 if (changed & BREAKPOINT_BIT) {
480 ets->reset_current_location(JVMTI_EVENT_BREAKPOINT, (now_enabled & BREAKPOINT_BIT) != 0);
481 }
482 trace_changed(state, now_enabled, changed);
483 }
484 return now_enabled;
485 }
486
487
488 // For the specified thread: compute the currently truly enabled events
489 // set external state accordingly. Only thread-filtered events are included.
490 jlong
491 JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) {
492 if (state == NULL) {
493 // associated JavaThread is exiting
494 return (jlong)0;
495 }
496
497 julong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits();
498 julong any_env_enabled = 0;
499 // JVMTI_EVENT_FRAME_POP can be disabled (in the case FRAME_POP_BIT is not set),
500 // but we need to set interp_only if some JvmtiEnvThreadState has frame pop set
501 // to clear the request
502 bool has_frame_pops = false;
503
504 {
505 // This iteration will include JvmtiEnvThreadStates whose environments
506 // have been disposed. These JvmtiEnvThreadStates must not be filtered
507 // as recompute must be called on them to disable their events,
508 JvmtiEnvThreadStateIterator it(state);
509 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
510 any_env_enabled |= recompute_env_thread_enabled(ets, state);
511 has_frame_pops |= ets->has_frame_pops();
512 }
513 }
514
515 if (any_env_enabled != was_any_env_enabled) {
516 // mark if event is truly enabled on this thread in any environment
517 state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled);
518
519 // update the JavaThread cached value for thread-specific should_post_on_exceptions value
520 bool should_post_on_exceptions = (any_env_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0;
521 state->set_should_post_on_exceptions(should_post_on_exceptions);
522 }
523
524 // compute interp_only mode
525 bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0 || has_frame_pops;
526 bool is_now_interp = state->is_interp_only_mode();
527
528 if (should_be_interp != is_now_interp) {
529 if (should_be_interp) {
530 enter_interp_only_mode(state);
531 } else {
532 leave_interp_only_mode(state);
533 }
534 }
535
536 return any_env_enabled;
537 }
538
539
540 // Compute truly enabled events - meaning if the event can and could be
541 // sent. An event is truly enabled if it is user enabled on the thread
542 // or globally user enabled, but only if there is a callback or event hook
543 // for it and, for field watch and frame pop, one has been set.
544 // Compute if truly enabled, per thread, per environment, per combination
545 // (thread x environment), and overall. These merges are true if any is true.
546 // True per thread if some environment has callback set and the event is globally
547 // enabled or enabled for this thread.
548 // True per environment if the callback is set and the event is globally
549 // enabled in this environment or enabled for any thread in this environment.
550 // True per combination if the environment has the callback set and the
551 // event is globally enabled in this environment or the event is enabled
552 // for this thread and environment.
553 //
554 // All states transitions dependent on these transitions are also handled here.
555 void
556 JvmtiEventControllerPrivate::recompute_enabled() {
557 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
558
559 // event enabled for any thread in any environment
560 julong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits();
561 julong any_env_thread_enabled = 0;
562
563 EC_TRACE(("[-] # recompute enabled - before " JULONG_FORMAT_X, was_any_env_thread_enabled));
564
565 // compute non-thread-filters events.
566 // This must be done separately from thread-filtered events, since some
567 // events can occur before any threads exist.
568 JvmtiEnvIterator it;
569 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
570 any_env_thread_enabled |= recompute_env_enabled(env);
571 }
572
573 // We need to create any missing jvmti_thread_state if there are globally set thread
574 // filtered events and there weren't last time
575 if ( (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 &&
576 (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) {
577 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) {
578 // state_for_while_locked() makes tp->is_exiting() check
579 JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing
580 }
581 }
582
583 // compute and set thread-filtered events
584 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
585 any_env_thread_enabled |= recompute_thread_enabled(state);
586 }
587
588 // set universal state (across all envs and threads)
589 jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled;
590 if (delta != 0) {
591 JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0);
592 JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0);
593 JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0);
594 JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0);
595 JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0);
596 JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0);
597 JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0);
598 JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0);
599 JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0);
600 JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0);
601 JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0);
602 JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0);
603 JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0);
604 JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0);
605 JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0);
606 JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0);
607 JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0);
608 JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0);
609 JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0);
610 JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0);
611 JvmtiExport::set_should_post_sampled_object_alloc((any_env_thread_enabled & SAMPLED_OBJECT_ALLOC_BIT) != 0);
612
613 // need this if we want thread events or we need them to init data
614 JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0);
615
616 // If single stepping is turned on or off, execute the VM op to change it.
617 if (delta & SINGLE_STEP_BIT) {
618 switch (JvmtiEnv::get_phase()) {
619 case JVMTI_PHASE_DEAD:
620 // If the VM is dying we can't execute VM ops
621 break;
622 case JVMTI_PHASE_LIVE: {
623 VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0);
624 VMThread::execute(&op);
625 break;
626 }
627 default:
628 assert(false, "should never come here before live phase");
629 break;
630 }
631 }
632
633 // set global truly enabled, that is, any thread in any environment
634 JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled);
635
636 // set global should_post_on_exceptions
637 JvmtiExport::set_should_post_on_exceptions((any_env_thread_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0);
638
639 }
640
641 EC_TRACE(("[-] # recompute enabled - after " JULONG_FORMAT_X, any_env_thread_enabled));
642 }
643
644
645 void
646 JvmtiEventControllerPrivate::thread_started(JavaThread *thread) {
647 assert(thread->is_Java_thread(), "Must be JavaThread");
648 assert(thread == Thread::current(), "must be current thread");
649 assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist");
650
651 EC_TRACE(("[%s] # thread started", JvmtiTrace::safe_get_thread_name(thread)));
652
653 // if we have any thread filtered events globally enabled, create/update the thread state
654 if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) {
655 MutexLocker mu(JvmtiThreadState_lock);
656 // create the thread state if missing
657 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
658 if (state != NULL) { // skip threads with no JVMTI thread state
659 recompute_thread_enabled(state);
660 }
661 }
662 }
663
664
665 void
666 JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) {
667 // Removes the JvmtiThreadState associated with the specified thread.
668 // May be called after all environments have been disposed.
669 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
670
671 EC_TRACE(("[%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread)));
672
673 JvmtiThreadState *state = thread->jvmti_thread_state();
674 assert(state != NULL, "else why are we here?");
675 delete state;
676 }
677
678 void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env,
679 const jvmtiEventCallbacks* callbacks,
680 jint size_of_callbacks) {
681 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
682 EC_TRACE(("[*] # set event callbacks"));
683
684 env->set_event_callbacks(callbacks, size_of_callbacks);
685 jlong enabled_bits = 0;
686 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
687 jvmtiEvent evt_t = (jvmtiEvent)ei;
688 if (env->has_callback(evt_t)) {
689 enabled_bits |= JvmtiEventEnabled::bit_for(evt_t);
690 }
691 }
692 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
693 recompute_enabled();
694 }
695
696 void
697 JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env,
698 jint extension_event_index,
699 jvmtiExtensionEvent callback)
700 {
701 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
702 EC_TRACE(("[*] # set extension event callback"));
703
704 // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL
705 assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL &&
706 extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check");
707
708
709 // As the bits for both standard (jvmtiEvent) and extension
710 // (jvmtiExtEvents) are stored in the same word we cast here to
711 // jvmtiEvent to set/clear the bit for this extension event.
712 jvmtiEvent event_type = (jvmtiEvent)extension_event_index;
713
714 // Prevent a possible race condition where events are re-enabled by a call to
715 // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate
716 // environment check and before the lock is acquired.
717 // We can safely do the is_valid check now, as JvmtiThreadState_lock is held.
718 bool enabling = (callback != NULL) && (env->is_valid());
719 env->env_event_enable()->set_user_enabled(event_type, enabling);
720
721 // update the callback
722 jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks();
723 switch (extension_event_index) {
724 case EXT_EVENT_CLASS_UNLOAD :
725 ext_callbacks->ClassUnload = callback;
726 break;
727 default:
728 ShouldNotReachHere();
729 }
730
731 // update the callback enable/disable bit
732 jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits();
733 jlong bit_for = JvmtiEventEnabled::bit_for(event_type);
734 if (enabling) {
735 enabled_bits |= bit_for;
736 } else {
737 enabled_bits &= ~bit_for;
738 }
739 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
740
741 recompute_enabled();
742 }
743
744
745 void
746 JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) {
747 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
748 EC_TRACE(("[*] # env initialize"));
749
750 if (JvmtiEnvBase::is_vm_live()) {
751 // if we didn't initialize event info already (this is a late
752 // launched environment), do it now.
753 event_init();
754 }
755
756 env->initialize();
757
758 // add the JvmtiEnvThreadState to each JvmtiThreadState
759 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
760 state->add_env(env);
761 assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check");
762 }
763 JvmtiEventControllerPrivate::recompute_enabled();
764 }
765
766
767 void
768 JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) {
769 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
770 EC_TRACE(("[*] # env dispose"));
771
772 // Before the environment is marked disposed, disable all events on this
773 // environment (by zapping the callbacks). As a result, the disposed
774 // environment will not call event handlers.
775 set_event_callbacks(env, NULL, 0);
776 for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL;
777 extension_event_index <= EXT_MAX_EVENT_TYPE_VAL;
778 ++extension_event_index) {
779 set_extension_event_callback(env, extension_event_index, NULL);
780 }
781
782 // Let the environment finish disposing itself.
783 env->env_dispose();
784 }
785
786
787 void
788 JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
789 jvmtiEvent event_type, bool enabled) {
790 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
791
792 EC_TRACE(("[%s] # user %s event %s",
793 thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread),
794 enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type)));
795
796 if (thread == NULL) {
797 env->env_event_enable()->set_user_enabled(event_type, enabled);
798 } else {
799 // create the thread state (if it didn't exist before)
800 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
801 if (state != NULL) {
802 state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled);
803 }
804 }
805 recompute_enabled();
806 }
807
808
809 void
810 JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
811 EC_TRACE(("[%s] # set frame pop - frame=%d",
812 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
813 fpop.frame_number() ));
814
815 ets->get_frame_pops()->set(fpop);
816 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
817 }
818
819
820 void
821 JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
822 EC_TRACE(("[%s] # clear frame pop - frame=%d",
823 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
824 fpop.frame_number() ));
825
826 ets->get_frame_pops()->clear(fpop);
827 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
828 }
829
830
831 void
832 JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
833 int cleared_cnt = ets->get_frame_pops()->clear_to(fpop);
834
835 EC_TRACE(("[%s] # clear to frame pop - frame=%d, count=%d",
836 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
837 fpop.frame_number(),
838 cleared_cnt ));
839
840 if (cleared_cnt > 0) {
841 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
842 }
843 }
844
845 void
846 JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) {
847 int *count_addr;
848
849 switch (event_type) {
850 case JVMTI_EVENT_FIELD_MODIFICATION:
851 count_addr = (int *)JvmtiExport::get_field_modification_count_addr();
852 break;
853 case JVMTI_EVENT_FIELD_ACCESS:
854 count_addr = (int *)JvmtiExport::get_field_access_count_addr();
855 break;
856 default:
857 assert(false, "incorrect event");
858 return;
859 }
860
861 EC_TRACE(("[-] # change field watch - %s %s count=%d",
862 event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access",
863 added? "add" : "remove",
864 *count_addr));
865
866 if (added) {
867 (*count_addr)++;
868 if (*count_addr == 1) {
869 recompute_enabled();
870 }
871 } else {
872 if (*count_addr > 0) {
873 (*count_addr)--;
874 if (*count_addr == 0) {
875 recompute_enabled();
876 }
877 } else {
878 assert(false, "field watch out of phase");
879 }
880 }
881 }
882
883 void
884 JvmtiEventControllerPrivate::event_init() {
885 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
886
887 if (_initialized) {
888 return;
889 }
890
891 EC_TRACE(("[-] # VM live"));
892
893 #ifdef ASSERT
894 // check that our idea and the spec's idea of threaded events match
895 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
896 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
897 assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei),
898 "thread filtered event list does not match");
899 }
900 #endif
901
902 _initialized = true;
903 }
904
905 void
906 JvmtiEventControllerPrivate::vm_start() {
907 // some events are now able to be enabled (phase has changed)
908 JvmtiEventControllerPrivate::recompute_enabled();
909 }
910
911
912 void
913 JvmtiEventControllerPrivate::vm_init() {
914 event_init();
915
916 // all the events are now able to be enabled (phase has changed)
917 JvmtiEventControllerPrivate::recompute_enabled();
918 }
919
920
921 void
922 JvmtiEventControllerPrivate::vm_death() {
923 // events are disabled (phase has changed)
924 JvmtiEventControllerPrivate::recompute_enabled();
925 }
926
927
928 ///////////////////////////////////////////////////////////////
929 //
930 // JvmtiEventController
931 //
932
933 JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled;
934
935 bool
936 JvmtiEventController::is_global_event(jvmtiEvent event_type) {
937 assert(is_valid_event_type(event_type), "invalid event type");
938 jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL);
939 return((bit_for & GLOBAL_EVENT_BITS)!=0);
940 }
941
942 void
943 JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) {
944 if (Threads::number_of_threads() == 0) {
945 // during early VM start-up locks don't exist, but we are safely single threaded,
946 // call the functionality without holding the JvmtiThreadState_lock.
947 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
948 } else {
949 MutexLocker mu(JvmtiThreadState_lock);
950 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
951 }
952 }
953
954
955 void
956 JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env,
957 const jvmtiEventCallbacks* callbacks,
958 jint size_of_callbacks) {
959 if (Threads::number_of_threads() == 0) {
960 // during early VM start-up locks don't exist, but we are safely single threaded,
961 // call the functionality without holding the JvmtiThreadState_lock.
962 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
963 } else {
964 MutexLocker mu(JvmtiThreadState_lock);
965 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
966 }
967 }
968
969 void
970 JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env,
971 jint extension_event_index,
972 jvmtiExtensionEvent callback) {
973 if (Threads::number_of_threads() == 0) {
974 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
975 } else {
976 MutexLocker mu(JvmtiThreadState_lock);
977 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
978 }
979 }
980
981
982
983
984 void
985 JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
986 assert(SafepointSynchronize::is_at_safepoint() || JvmtiThreadState_lock->is_locked(), "Safepoint or must be locked");
987 JvmtiEventControllerPrivate::set_frame_pop(ets, fpop);
988 }
989
990
991 void
992 JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
993 assert(SafepointSynchronize::is_at_safepoint() || JvmtiThreadState_lock->is_locked(), "Safepoint or must be locked");
994 JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop);
995 }
996
997
998 void
999 JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1000 assert(SafepointSynchronize::is_at_safepoint() || JvmtiThreadState_lock->is_locked(), "Safepoint or must be locked");
1001 JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop);
1002 }
1003
1004 void
1005 JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) {
1006 MutexLocker mu(JvmtiThreadState_lock);
1007 JvmtiEventControllerPrivate::change_field_watch(event_type, added);
1008 }
1009
1010 void
1011 JvmtiEventController::thread_started(JavaThread *thread) {
1012 // operates only on the current thread
1013 // JvmtiThreadState_lock grabbed only if needed.
1014 JvmtiEventControllerPrivate::thread_started(thread);
1015 }
1016
1017 void
1018 JvmtiEventController::thread_ended(JavaThread *thread) {
1019 // operates only on the current thread
1020 // JvmtiThreadState_lock grabbed only if needed.
1021 JvmtiEventControllerPrivate::thread_ended(thread);
1022 }
1023
1024 void
1025 JvmtiEventController::env_initialize(JvmtiEnvBase *env) {
1026 if (Threads::number_of_threads() == 0) {
1027 // during early VM start-up locks don't exist, but we are safely single threaded,
1028 // call the functionality without holding the JvmtiThreadState_lock.
1029 JvmtiEventControllerPrivate::env_initialize(env);
1030 } else {
1031 MutexLocker mu(JvmtiThreadState_lock);
1032 JvmtiEventControllerPrivate::env_initialize(env);
1033 }
1034 }
1035
1036 void
1037 JvmtiEventController::env_dispose(JvmtiEnvBase *env) {
1038 if (Threads::number_of_threads() == 0) {
1039 // during early VM start-up locks don't exist, but we are safely single threaded,
1040 // call the functionality without holding the JvmtiThreadState_lock.
1041 JvmtiEventControllerPrivate::env_dispose(env);
1042 } else {
1043 MutexLocker mu(JvmtiThreadState_lock);
1044 JvmtiEventControllerPrivate::env_dispose(env);
1045 }
1046 }
1047
1048
1049 void
1050 JvmtiEventController::vm_start() {
1051 if (JvmtiEnvBase::environments_might_exist()) {
1052 MutexLocker mu(JvmtiThreadState_lock);
1053 JvmtiEventControllerPrivate::vm_start();
1054 }
1055 }
1056
1057 void
1058 JvmtiEventController::vm_init() {
1059 if (JvmtiEnvBase::environments_might_exist()) {
1060 MutexLocker mu(JvmtiThreadState_lock);
1061 JvmtiEventControllerPrivate::vm_init();
1062 }
1063 }
1064
1065 void
1066 JvmtiEventController::vm_death() {
1067 if (JvmtiEnvBase::environments_might_exist()) {
1068 MutexLocker mu(JvmtiThreadState_lock);
1069 JvmtiEventControllerPrivate::vm_death();
1070 }
1071 }