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