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