1/*
2 * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "interpreter/interpreter.hpp"
27#include "jvmtifiles/jvmtiEnv.hpp"
28#include "logging/log.hpp"
29#include "memory/resourceArea.hpp"
30#include "prims/jvmtiEventController.hpp"
31#include "prims/jvmtiEventController.inline.hpp"
32#include "prims/jvmtiExport.hpp"
33#include "prims/jvmtiImpl.hpp"
34#include "prims/jvmtiThreadState.inline.hpp"
35#include "runtime/frame.hpp"
36#include "runtime/thread.hpp"
37#include "runtime/vframe.hpp"
38#include "runtime/vframe_hp.hpp"
39#include "runtime/vmThread.hpp"
40#include "runtime/vm_operations.hpp"
41
42#ifdef JVMTI_TRACE
43#define EC_TRACE(out) do { \
44  if (JvmtiTrace::trace_event_controller()) { \
45    SafeResourceMark rm; \
46    log_trace(jvmti) out; \
47  } \
48} while (0)
49#else
50#define EC_TRACE(out)
51#endif /*JVMTI_TRACE */
52
53// bits for standard events
54
55static const jlong  SINGLE_STEP_BIT = (((jlong)1) << (JVMTI_EVENT_SINGLE_STEP - TOTAL_MIN_EVENT_TYPE_VAL));
56static const jlong  FRAME_POP_BIT = (((jlong)1) << (JVMTI_EVENT_FRAME_POP - TOTAL_MIN_EVENT_TYPE_VAL));
57static const jlong  BREAKPOINT_BIT = (((jlong)1) << (JVMTI_EVENT_BREAKPOINT - TOTAL_MIN_EVENT_TYPE_VAL));
58static const jlong  FIELD_ACCESS_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_ACCESS - TOTAL_MIN_EVENT_TYPE_VAL));
59static const jlong  FIELD_MODIFICATION_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_MODIFICATION - TOTAL_MIN_EVENT_TYPE_VAL));
60static const jlong  METHOD_ENTRY_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_ENTRY - TOTAL_MIN_EVENT_TYPE_VAL));
61static const jlong  METHOD_EXIT_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_EXIT - TOTAL_MIN_EVENT_TYPE_VAL));
62static const jlong  CLASS_FILE_LOAD_HOOK_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_FILE_LOAD_HOOK - TOTAL_MIN_EVENT_TYPE_VAL));
63static const jlong  NATIVE_METHOD_BIND_BIT = (((jlong)1) << (JVMTI_EVENT_NATIVE_METHOD_BIND - TOTAL_MIN_EVENT_TYPE_VAL));
64static const jlong  VM_START_BIT = (((jlong)1) << (JVMTI_EVENT_VM_START - TOTAL_MIN_EVENT_TYPE_VAL));
65static const jlong  VM_INIT_BIT = (((jlong)1) << (JVMTI_EVENT_VM_INIT - TOTAL_MIN_EVENT_TYPE_VAL));
66static const jlong  VM_DEATH_BIT = (((jlong)1) << (JVMTI_EVENT_VM_DEATH - TOTAL_MIN_EVENT_TYPE_VAL));
67static const jlong  CLASS_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_LOAD - TOTAL_MIN_EVENT_TYPE_VAL));
68static const jlong  CLASS_PREPARE_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_PREPARE - TOTAL_MIN_EVENT_TYPE_VAL));
69static const jlong  THREAD_START_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_START - TOTAL_MIN_EVENT_TYPE_VAL));
70static const jlong  THREAD_END_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_END - TOTAL_MIN_EVENT_TYPE_VAL));
71static const jlong  EXCEPTION_THROW_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION - TOTAL_MIN_EVENT_TYPE_VAL));
72static const jlong  EXCEPTION_CATCH_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION_CATCH - TOTAL_MIN_EVENT_TYPE_VAL));
73static const jlong  MONITOR_CONTENDED_ENTER_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTER - TOTAL_MIN_EVENT_TYPE_VAL));
74static const jlong  MONITOR_CONTENDED_ENTERED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTERED - TOTAL_MIN_EVENT_TYPE_VAL));
75static const jlong  MONITOR_WAIT_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAIT - TOTAL_MIN_EVENT_TYPE_VAL));
76static const jlong  MONITOR_WAITED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAITED - TOTAL_MIN_EVENT_TYPE_VAL));
77static const jlong  DYNAMIC_CODE_GENERATED_BIT = (((jlong)1) << (JVMTI_EVENT_DYNAMIC_CODE_GENERATED - TOTAL_MIN_EVENT_TYPE_VAL));
78static const jlong  DATA_DUMP_BIT = (((jlong)1) << (JVMTI_EVENT_DATA_DUMP_REQUEST - TOTAL_MIN_EVENT_TYPE_VAL));
79static const jlong  COMPILED_METHOD_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_LOAD - TOTAL_MIN_EVENT_TYPE_VAL));
80static const jlong  COMPILED_METHOD_UNLOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
81static const jlong  GARBAGE_COLLECTION_START_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_START - TOTAL_MIN_EVENT_TYPE_VAL));
82static const jlong  GARBAGE_COLLECTION_FINISH_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_FINISH - TOTAL_MIN_EVENT_TYPE_VAL));
83static const jlong  OBJECT_FREE_BIT = (((jlong)1) << (JVMTI_EVENT_OBJECT_FREE - TOTAL_MIN_EVENT_TYPE_VAL));
84static const jlong  RESOURCE_EXHAUSTED_BIT = (((jlong)1) << (JVMTI_EVENT_RESOURCE_EXHAUSTED - TOTAL_MIN_EVENT_TYPE_VAL));
85static const jlong  VM_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_VM_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL));
86
87// bits for extension events
88static const jlong  CLASS_UNLOAD_BIT = (((jlong)1) << (EXT_EVENT_CLASS_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
89
90
91static const jlong  MONITOR_BITS = MONITOR_CONTENDED_ENTER_BIT | MONITOR_CONTENDED_ENTERED_BIT |
92                          MONITOR_WAIT_BIT | MONITOR_WAITED_BIT;
93static const jlong  EXCEPTION_BITS = EXCEPTION_THROW_BIT | EXCEPTION_CATCH_BIT;
94static const jlong  INTERP_EVENT_BITS =  SINGLE_STEP_BIT | METHOD_ENTRY_BIT | METHOD_EXIT_BIT |
95                                FRAME_POP_BIT | FIELD_ACCESS_BIT | FIELD_MODIFICATION_BIT;
96static const jlong  THREAD_FILTERED_EVENT_BITS = INTERP_EVENT_BITS | EXCEPTION_BITS | MONITOR_BITS |
97                                        BREAKPOINT_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | THREAD_END_BIT;
98static const jlong  NEED_THREAD_LIFE_EVENTS = THREAD_FILTERED_EVENT_BITS | THREAD_START_BIT;
99static const jlong  EARLY_EVENT_BITS = CLASS_FILE_LOAD_HOOK_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT |
100                               VM_START_BIT | VM_INIT_BIT | VM_DEATH_BIT | NATIVE_METHOD_BIND_BIT |
101                               THREAD_START_BIT | THREAD_END_BIT |
102                               COMPILED_METHOD_LOAD_BIT | COMPILED_METHOD_UNLOAD_BIT |
103                               DYNAMIC_CODE_GENERATED_BIT;
104static const jlong  GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS;
105static const jlong  SHOULD_POST_ON_EXCEPTIONS_BITS = EXCEPTION_BITS | METHOD_EXIT_BIT | FRAME_POP_BIT;
106
107///////////////////////////////////////////////////////////////
108//
109// JvmtiEventEnabled
110//
111
112JvmtiEventEnabled::JvmtiEventEnabled() {
113  clear();
114}
115
116
117void JvmtiEventEnabled::clear() {
118  _enabled_bits = 0;
119#ifndef PRODUCT
120  _init_guard = JEE_INIT_GUARD;
121#endif
122}
123
124void JvmtiEventEnabled::set_enabled(jvmtiEvent event_type, bool enabled) {
125  jlong bits = get_bits();
126  jlong mask = bit_for(event_type);
127  if (enabled) {
128    bits |= mask;
129  } else {
130    bits &= ~mask;
131  }
132  set_bits(bits);
133}
134
135
136///////////////////////////////////////////////////////////////
137//
138// JvmtiEnvThreadEventEnable
139//
140
141JvmtiEnvThreadEventEnable::JvmtiEnvThreadEventEnable() {
142  _event_user_enabled.clear();
143  _event_enabled.clear();
144}
145
146
147JvmtiEnvThreadEventEnable::~JvmtiEnvThreadEventEnable() {
148  _event_user_enabled.clear();
149  _event_enabled.clear();
150}
151
152
153///////////////////////////////////////////////////////////////
154//
155// JvmtiThreadEventEnable
156//
157
158JvmtiThreadEventEnable::JvmtiThreadEventEnable() {
159  _event_enabled.clear();
160}
161
162
163JvmtiThreadEventEnable::~JvmtiThreadEventEnable() {
164  _event_enabled.clear();
165}
166
167
168///////////////////////////////////////////////////////////////
169//
170// JvmtiEnvEventEnable
171//
172
173JvmtiEnvEventEnable::JvmtiEnvEventEnable() {
174  _event_user_enabled.clear();
175  _event_callback_enabled.clear();
176  _event_enabled.clear();
177}
178
179
180JvmtiEnvEventEnable::~JvmtiEnvEventEnable() {
181  _event_user_enabled.clear();
182  _event_callback_enabled.clear();
183  _event_enabled.clear();
184}
185
186
187///////////////////////////////////////////////////////////////
188//
189// VM_EnterInterpOnlyMode
190//
191
192class VM_EnterInterpOnlyMode : public VM_Operation {
193private:
194  JvmtiThreadState *_state;
195
196public:
197  VM_EnterInterpOnlyMode(JvmtiThreadState *state);
198
199  bool allow_nested_vm_operations() const        { return true; }
200  VMOp_Type type() const { return VMOp_EnterInterpOnlyMode; }
201  void doit();
202
203  // to do: this same function is in jvmtiImpl - should be in one place
204  bool can_be_deoptimized(vframe* vf) {
205    return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized());
206  }
207};
208
209VM_EnterInterpOnlyMode::VM_EnterInterpOnlyMode(JvmtiThreadState *state)
210  : _state(state)
211{
212}
213
214
215void VM_EnterInterpOnlyMode::doit() {
216  // Set up the current stack depth for later tracking
217  _state->invalidate_cur_stack_depth();
218
219  _state->enter_interp_only_mode();
220
221  JavaThread *thread = _state->get_thread();
222  if (thread->has_last_Java_frame()) {
223    // If running in fullspeed mode, single stepping is implemented
224    // as follows: first, the interpreter does not dispatch to
225    // compiled code for threads that have single stepping enabled;
226    // second, we deoptimize all methods on the thread's stack when
227    // interpreted-only mode is enabled the first time for a given
228    // thread (nothing to do if no Java frames yet).
229    int num_marked = 0;
230    ResourceMark resMark;
231    RegisterMap rm(thread, false);
232    for (vframe* vf = thread->last_java_vframe(&rm); vf; vf = vf->sender()) {
233      if (can_be_deoptimized(vf)) {
234        ((compiledVFrame*) vf)->code()->mark_for_deoptimization();
235        ++num_marked;
236      }
237    }
238    if (num_marked > 0) {
239      VM_Deoptimize op;
240      VMThread::execute(&op);
241    }
242  }
243}
244
245
246///////////////////////////////////////////////////////////////
247//
248// VM_ChangeSingleStep
249//
250
251class VM_ChangeSingleStep : public VM_Operation {
252private:
253  bool _on;
254
255public:
256  VM_ChangeSingleStep(bool on);
257  VMOp_Type type() const                         { return VMOp_ChangeSingleStep; }
258  bool allow_nested_vm_operations() const        { return true; }
259  void doit();   // method definition is after definition of JvmtiEventControllerPrivate because of scoping
260};
261
262
263VM_ChangeSingleStep::VM_ChangeSingleStep(bool on)
264  : _on(on != 0)
265{
266}
267
268
269
270
271///////////////////////////////////////////////////////////////
272//
273// JvmtiEventControllerPrivate
274//
275// Private internal implementation methods for JvmtiEventController.
276//
277// These methods are thread safe either because they are called
278// in early VM initialization which is single threaded, or they
279// hold the JvmtiThreadState_lock.
280//
281
282class JvmtiEventControllerPrivate : public AllStatic {
283  static bool _initialized;
284public:
285  static void set_should_post_single_step(bool on);
286  static void enter_interp_only_mode(JvmtiThreadState *state);
287  static void leave_interp_only_mode(JvmtiThreadState *state);
288  static void recompute_enabled();
289  static jlong recompute_env_enabled(JvmtiEnvBase* env);
290  static jlong recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state);
291  static jlong recompute_thread_enabled(JvmtiThreadState *state);
292  static void event_init();
293
294  static void set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
295                        jvmtiEvent event_type, bool enabled);
296  static void set_event_callbacks(JvmtiEnvBase *env,
297                                  const jvmtiEventCallbacks* callbacks,
298                                  jint size_of_callbacks);
299
300  static void set_extension_event_callback(JvmtiEnvBase *env,
301                                           jint extension_event_index,
302                                           jvmtiExtensionEvent callback);
303
304  static void set_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
305  static void clear_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
306  static void clear_to_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
307  static void change_field_watch(jvmtiEvent event_type, bool added);
308
309  static void thread_started(JavaThread *thread);
310  static void thread_ended(JavaThread *thread);
311
312  static void env_initialize(JvmtiEnvBase *env);
313  static void env_dispose(JvmtiEnvBase *env);
314
315  static void vm_start();
316  static void vm_init();
317  static void vm_death();
318
319  static void trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed);
320  static void trace_changed(jlong now_enabled, jlong changed);
321};
322
323bool JvmtiEventControllerPrivate::_initialized = false;
324
325void JvmtiEventControllerPrivate::set_should_post_single_step(bool on) {
326  // we have permission to do this, VM op doesn't
327  JvmtiExport::set_should_post_single_step(on);
328}
329
330
331// This change must always be occur when at a safepoint.
332// Being at a safepoint causes the interpreter to use the
333// safepoint dispatch table which we overload to find single
334// step points.  Just to be sure that it has been set, we
335// call notice_safepoints when turning on single stepping.
336// When we leave our current safepoint, should_post_single_step
337// will be checked by the interpreter, and the table kept
338// or changed accordingly.
339void VM_ChangeSingleStep::doit() {
340  JvmtiEventControllerPrivate::set_should_post_single_step(_on);
341  if (_on) {
342    Interpreter::notice_safepoints();
343  }
344}
345
346
347void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) {
348  EC_TRACE(("[%s] # Entering interpreter only mode",
349            JvmtiTrace::safe_get_thread_name(state->get_thread())));
350
351  VM_EnterInterpOnlyMode op(state);
352  VMThread::execute(&op);
353}
354
355
356void
357JvmtiEventControllerPrivate::leave_interp_only_mode(JvmtiThreadState *state) {
358  EC_TRACE(("[%s] # Leaving interpreter only mode",
359            JvmtiTrace::safe_get_thread_name(state->get_thread())));
360  state->leave_interp_only_mode();
361}
362
363
364void
365JvmtiEventControllerPrivate::trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed) {
366#ifdef JVMTI_TRACE
367  if (JvmtiTrace::trace_event_controller()) {
368    SafeResourceMark rm;
369    // traces standard events only
370    for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
371      jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
372      if (changed & bit) {
373        // it changed, print it
374         log_trace(jvmti)("[%s] # %s event %s",
375                      JvmtiTrace::safe_get_thread_name(state->get_thread()),
376                      (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
377      }
378    }
379  }
380#endif /*JVMTI_TRACE */
381}
382
383
384void
385JvmtiEventControllerPrivate::trace_changed(jlong now_enabled, jlong changed) {
386#ifdef JVMTI_TRACE
387  if (JvmtiTrace::trace_event_controller()) {
388    SafeResourceMark rm;
389    // traces standard events only
390    for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
391      jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
392      if (changed & bit) {
393        // it changed, print it
394         log_trace(jvmti)("[-] # %s event %s",
395                      (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
396      }
397    }
398  }
399#endif /*JVMTI_TRACE */
400}
401
402
403// For the specified env: compute the currently truly enabled events
404// set external state accordingly.
405// Return value and set value must include all events.
406// But outside this class, only non-thread-filtered events can be queried..
407jlong
408JvmtiEventControllerPrivate::recompute_env_enabled(JvmtiEnvBase* env) {
409  jlong was_enabled = env->env_event_enable()->_event_enabled.get_bits();
410  jlong now_enabled =
411    env->env_event_enable()->_event_callback_enabled.get_bits() &
412    env->env_event_enable()->_event_user_enabled.get_bits();
413
414  switch (env->phase()) {
415  case JVMTI_PHASE_PRIMORDIAL:
416  case JVMTI_PHASE_ONLOAD:
417    // only these events allowed in primordial or onload phase
418    now_enabled &= (EARLY_EVENT_BITS & ~THREAD_FILTERED_EVENT_BITS);
419    break;
420  case JVMTI_PHASE_START:
421    // only these events allowed in start phase
422    now_enabled &= EARLY_EVENT_BITS;
423    break;
424  case JVMTI_PHASE_LIVE:
425    // all events allowed during live phase
426    break;
427  case JVMTI_PHASE_DEAD:
428    // no events allowed when dead
429    now_enabled = 0;
430    break;
431  default:
432    assert(false, "no other phases - sanity check");
433    break;
434  }
435
436  // will we really send these events to this env
437  env->env_event_enable()->_event_enabled.set_bits(now_enabled);
438
439  trace_changed(now_enabled, (now_enabled ^ was_enabled)  & ~THREAD_FILTERED_EVENT_BITS);
440
441  return now_enabled;
442}
443
444
445// For the specified env and thread: compute the currently truly enabled events
446// set external state accordingly.  Only thread-filtered events are included.
447jlong
448JvmtiEventControllerPrivate::recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state) {
449  JvmtiEnv *env = ets->get_env();
450
451  jlong was_enabled = ets->event_enable()->_event_enabled.get_bits();
452  jlong now_enabled =  THREAD_FILTERED_EVENT_BITS &
453    env->env_event_enable()->_event_callback_enabled.get_bits() &
454    (env->env_event_enable()->_event_user_enabled.get_bits() |
455     ets->event_enable()->_event_user_enabled.get_bits());
456
457  // for frame pops and field watchs, computed enabled state
458  // is only true if an event has been requested
459  if (!ets->has_frame_pops()) {
460    now_enabled &= ~FRAME_POP_BIT;
461  }
462  if (*((int *)JvmtiExport::get_field_access_count_addr()) == 0) {
463    now_enabled &= ~FIELD_ACCESS_BIT;
464  }
465  if (*((int *)JvmtiExport::get_field_modification_count_addr()) == 0) {
466    now_enabled &= ~FIELD_MODIFICATION_BIT;
467  }
468
469  switch (JvmtiEnv::get_phase()) {
470  case JVMTI_PHASE_DEAD:
471    // no events allowed when dead
472    now_enabled = 0;
473    break;
474  default:
475    break;
476  }
477
478  // if anything changed do update
479  if (now_enabled != was_enabled) {
480
481    // will we really send these events to this thread x env
482    ets->event_enable()->_event_enabled.set_bits(now_enabled);
483
484    // If the enabled status of the single step or breakpoint events changed,
485    // the location status may need to change as well.
486    jlong changed = now_enabled ^ was_enabled;
487    if (changed & SINGLE_STEP_BIT) {
488      ets->reset_current_location(JVMTI_EVENT_SINGLE_STEP, (now_enabled & SINGLE_STEP_BIT) != 0);
489    }
490    if (changed & BREAKPOINT_BIT) {
491      ets->reset_current_location(JVMTI_EVENT_BREAKPOINT,  (now_enabled & BREAKPOINT_BIT) != 0);
492    }
493    trace_changed(state, now_enabled, changed);
494  }
495  return now_enabled;
496}
497
498
499// For the specified thread: compute the currently truly enabled events
500// set external state accordingly.  Only thread-filtered events are included.
501jlong
502JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) {
503  if (state == NULL) {
504    // associated JavaThread is exiting
505    return (jlong)0;
506  }
507
508  julong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits();
509  julong any_env_enabled = 0;
510
511  {
512    // This iteration will include JvmtiEnvThreadStates whoses environments
513    // have been disposed.  These JvmtiEnvThreadStates must not be filtered
514    // as recompute must be called on them to disable their events,
515    JvmtiEnvThreadStateIterator it(state);
516    for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
517      any_env_enabled |= recompute_env_thread_enabled(ets, state);
518    }
519  }
520
521  if (any_env_enabled != was_any_env_enabled) {
522    // mark if event is truly enabled on this thread in any environment
523    state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled);
524
525    // compute interp_only mode
526    bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0;
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    // update the JavaThread cached value for thread-specific should_post_on_exceptions value
538    bool should_post_on_exceptions = (any_env_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0;
539    state->set_should_post_on_exceptions(should_post_on_exceptions);
540  }
541
542  return any_env_enabled;
543}
544
545
546// Compute truly enabled events - meaning if the event can and could be
547// sent.  An event is truly enabled if it is user enabled on the thread
548// or globally user enabled, but only if there is a callback or event hook
549// for it and, for field watch and frame pop, one has been set.
550// Compute if truly enabled, per thread, per environment, per combination
551// (thread x environment), and overall.  These merges are true if any is true.
552// True per thread if some environment has callback set and the event is globally
553// enabled or enabled for this thread.
554// True per environment if the callback is set and the event is globally
555// enabled in this environment or enabled for any thread in this environment.
556// True per combination if the environment has the callback set and the
557// event is globally enabled in this environment or the event is enabled
558// for this thread and environment.
559//
560// All states transitions dependent on these transitions are also handled here.
561void
562JvmtiEventControllerPrivate::recompute_enabled() {
563  assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
564
565  // event enabled for any thread in any environment
566  julong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits();
567  julong any_env_thread_enabled = 0;
568
569  EC_TRACE(("[-] # recompute enabled - before " JULONG_FORMAT_X, was_any_env_thread_enabled));
570
571  // compute non-thread-filters events.
572  // This must be done separately from thread-filtered events, since some
573  // events can occur before any threads exist.
574  JvmtiEnvIterator it;
575  for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
576    any_env_thread_enabled |= recompute_env_enabled(env);
577  }
578
579  // We need to create any missing jvmti_thread_state if there are globally set thread
580  // filtered events and there weren't last time
581  if (    (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 &&
582      (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) {
583    {
584      MutexLocker mu(Threads_lock);   //hold the Threads_lock for the iteration
585      for (JavaThread *tp = Threads::first(); tp != NULL; tp = tp->next()) {
586        // state_for_while_locked() makes tp->is_exiting() check
587        JvmtiThreadState::state_for_while_locked(tp);  // create the thread state if missing
588      }
589    }// release Threads_lock
590  }
591
592  // compute and set thread-filtered events
593  for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
594    any_env_thread_enabled |= recompute_thread_enabled(state);
595  }
596
597  // set universal state (across all envs and threads)
598  jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled;
599  if (delta != 0) {
600    JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0);
601    JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0);
602    JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0);
603    JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0);
604    JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0);
605    JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0);
606    JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0);
607    JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0);
608    JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0);
609    JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0);
610    JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0);
611    JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0);
612    JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0);
613    JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0);
614    JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0);
615    JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0);
616    JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0);
617    JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0);
618    JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0);
619    JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0);
620
621    // need this if we want thread events or we need them to init data
622    JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0);
623
624    // If single stepping is turned on or off, execute the VM op to change it.
625    if (delta & SINGLE_STEP_BIT) {
626      switch (JvmtiEnv::get_phase()) {
627      case JVMTI_PHASE_DEAD:
628        // If the VM is dying we can't execute VM ops
629        break;
630      case JVMTI_PHASE_LIVE: {
631        VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0);
632        VMThread::execute(&op);
633        break;
634      }
635      default:
636        assert(false, "should never come here before live phase");
637        break;
638      }
639    }
640
641    // set global truly enabled, that is, any thread in any environment
642    JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled);
643
644    // set global should_post_on_exceptions
645    JvmtiExport::set_should_post_on_exceptions((any_env_thread_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0);
646
647  }
648
649  EC_TRACE(("[-] # recompute enabled - after " JULONG_FORMAT_X, any_env_thread_enabled));
650}
651
652
653void
654JvmtiEventControllerPrivate::thread_started(JavaThread *thread) {
655  assert(thread->is_Java_thread(), "Must be JavaThread");
656  assert(thread == Thread::current(), "must be current thread");
657  assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist");
658
659  EC_TRACE(("[%s] # thread started", JvmtiTrace::safe_get_thread_name(thread)));
660
661  // if we have any thread filtered events globally enabled, create/update the thread state
662  if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) {
663    MutexLocker mu(JvmtiThreadState_lock);
664    // create the thread state if missing
665    JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
666    if (state != NULL) {    // skip threads with no JVMTI thread state
667      recompute_thread_enabled(state);
668    }
669  }
670}
671
672
673void
674JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) {
675  // Removes the JvmtiThreadState associated with the specified thread.
676  // May be called after all environments have been disposed.
677  assert(JvmtiThreadState_lock->is_locked(), "sanity check");
678
679  EC_TRACE(("[%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread)));
680
681  JvmtiThreadState *state = thread->jvmti_thread_state();
682  assert(state != NULL, "else why are we here?");
683  delete state;
684}
685
686void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env,
687                                                      const jvmtiEventCallbacks* callbacks,
688                                                      jint size_of_callbacks) {
689  assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
690  EC_TRACE(("[*] # set event callbacks"));
691
692  env->set_event_callbacks(callbacks, size_of_callbacks);
693  jlong enabled_bits = 0;
694  for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
695    jvmtiEvent evt_t = (jvmtiEvent)ei;
696    if (env->has_callback(evt_t)) {
697      enabled_bits |= JvmtiEventEnabled::bit_for(evt_t);
698    }
699  }
700  env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
701  recompute_enabled();
702}
703
704void
705JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env,
706                                                          jint extension_event_index,
707                                                          jvmtiExtensionEvent callback)
708{
709  assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
710  EC_TRACE(("[*] # set extension event callback"));
711
712  // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL
713  assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL &&
714         extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check");
715
716
717  // As the bits for both standard (jvmtiEvent) and extension
718  // (jvmtiExtEvents) are stored in the same word we cast here to
719  // jvmtiEvent to set/clear the bit for this extension event.
720  jvmtiEvent event_type = (jvmtiEvent)extension_event_index;
721
722  // Prevent a possible race condition where events are re-enabled by a call to
723  // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate
724  // environment check and before the lock is acquired.
725  // We can safely do the is_valid check now, as JvmtiThreadState_lock is held.
726  bool enabling = (callback != NULL) && (env->is_valid());
727  env->env_event_enable()->set_user_enabled(event_type, enabling);
728
729  // update the callback
730  jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks();
731  switch (extension_event_index) {
732    case EXT_EVENT_CLASS_UNLOAD :
733      ext_callbacks->ClassUnload = callback;
734      break;
735    default:
736      ShouldNotReachHere();
737  }
738
739  // update the callback enable/disable bit
740  jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits();
741  jlong bit_for = JvmtiEventEnabled::bit_for(event_type);
742  if (enabling) {
743    enabled_bits |= bit_for;
744  } else {
745    enabled_bits &= ~bit_for;
746  }
747  env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
748
749  recompute_enabled();
750}
751
752
753void
754JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) {
755  assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
756  EC_TRACE(("[*] # env initialize"));
757
758  if (JvmtiEnvBase::is_vm_live()) {
759    // if we didn't initialize event info already (this is a late
760    // launched environment), do it now.
761    event_init();
762  }
763
764  env->initialize();
765
766  // add the JvmtiEnvThreadState to each JvmtiThreadState
767  for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
768    state->add_env(env);
769    assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check");
770  }
771  JvmtiEventControllerPrivate::recompute_enabled();
772}
773
774
775void
776JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) {
777  assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
778  EC_TRACE(("[*] # env dispose"));
779
780  // Before the environment is marked disposed, disable all events on this
781  // environment (by zapping the callbacks).  As a result, the disposed
782  // environment will not call event handlers.
783  set_event_callbacks(env, NULL, 0);
784  for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL;
785       extension_event_index <= EXT_MAX_EVENT_TYPE_VAL;
786       ++extension_event_index) {
787    set_extension_event_callback(env, extension_event_index, NULL);
788  }
789
790  // Let the environment finish disposing itself.
791  env->env_dispose();
792}
793
794
795void
796JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
797                                          jvmtiEvent event_type, bool enabled) {
798  assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
799
800  EC_TRACE(("[%s] # user %s event %s",
801            thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread),
802            enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type)));
803
804  if (thread == NULL) {
805    env->env_event_enable()->set_user_enabled(event_type, enabled);
806  } else {
807    // create the thread state (if it didn't exist before)
808    JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
809    if (state != NULL) {
810      state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled);
811    }
812  }
813  recompute_enabled();
814}
815
816
817void
818JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
819  EC_TRACE(("[%s] # set frame pop - frame=%d",
820            JvmtiTrace::safe_get_thread_name(ets->get_thread()),
821            fpop.frame_number() ));
822
823  ets->get_frame_pops()->set(fpop);
824  recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
825}
826
827
828void
829JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
830  EC_TRACE(("[%s] # clear frame pop - frame=%d",
831            JvmtiTrace::safe_get_thread_name(ets->get_thread()),
832            fpop.frame_number() ));
833
834  ets->get_frame_pops()->clear(fpop);
835  recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
836}
837
838
839void
840JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
841  int cleared_cnt = ets->get_frame_pops()->clear_to(fpop);
842
843  EC_TRACE(("[%s] # clear to frame pop - frame=%d, count=%d",
844            JvmtiTrace::safe_get_thread_name(ets->get_thread()),
845            fpop.frame_number(),
846            cleared_cnt ));
847
848  if (cleared_cnt > 0) {
849    recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
850  }
851}
852
853void
854JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) {
855  int *count_addr;
856
857  switch (event_type) {
858  case JVMTI_EVENT_FIELD_MODIFICATION:
859    count_addr = (int *)JvmtiExport::get_field_modification_count_addr();
860    break;
861  case JVMTI_EVENT_FIELD_ACCESS:
862    count_addr = (int *)JvmtiExport::get_field_access_count_addr();
863    break;
864  default:
865    assert(false, "incorrect event");
866    return;
867  }
868
869  EC_TRACE(("[-] # change field watch - %s %s count=%d",
870            event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access",
871            added? "add" : "remove",
872            *count_addr));
873
874  if (added) {
875    (*count_addr)++;
876    if (*count_addr == 1) {
877      recompute_enabled();
878    }
879  } else {
880    if (*count_addr > 0) {
881      (*count_addr)--;
882      if (*count_addr == 0) {
883        recompute_enabled();
884      }
885    } else {
886      assert(false, "field watch out of phase");
887    }
888  }
889}
890
891void
892JvmtiEventControllerPrivate::event_init() {
893  assert(JvmtiThreadState_lock->is_locked(), "sanity check");
894
895  if (_initialized) {
896    return;
897  }
898
899  EC_TRACE(("[-] # VM live"));
900
901#ifdef ASSERT
902  // check that our idea and the spec's idea of threaded events match
903  for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
904    jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
905    assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei),
906           "thread filtered event list does not match");
907  }
908#endif
909
910  _initialized = true;
911}
912
913void
914JvmtiEventControllerPrivate::vm_start() {
915  // some events are now able to be enabled (phase has changed)
916  JvmtiEventControllerPrivate::recompute_enabled();
917}
918
919
920void
921JvmtiEventControllerPrivate::vm_init() {
922  event_init();
923
924  // all the events are now able to be enabled (phase has changed)
925  JvmtiEventControllerPrivate::recompute_enabled();
926}
927
928
929void
930JvmtiEventControllerPrivate::vm_death() {
931  // events are disabled (phase has changed)
932  JvmtiEventControllerPrivate::recompute_enabled();
933}
934
935
936///////////////////////////////////////////////////////////////
937//
938// JvmtiEventController
939//
940
941JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled;
942
943bool
944JvmtiEventController::is_global_event(jvmtiEvent event_type) {
945  assert(is_valid_event_type(event_type), "invalid event type");
946  jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL);
947  return((bit_for & GLOBAL_EVENT_BITS)!=0);
948}
949
950void
951JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) {
952  if (Threads::number_of_threads() == 0) {
953    // during early VM start-up locks don't exist, but we are safely single threaded,
954    // call the functionality without holding the JvmtiThreadState_lock.
955    JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
956  } else {
957    MutexLocker mu(JvmtiThreadState_lock);
958    JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
959  }
960}
961
962
963void
964JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env,
965                                          const jvmtiEventCallbacks* callbacks,
966                                          jint size_of_callbacks) {
967  if (Threads::number_of_threads() == 0) {
968    // during early VM start-up locks don't exist, but we are safely single threaded,
969    // call the functionality without holding the JvmtiThreadState_lock.
970    JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
971  } else {
972    MutexLocker mu(JvmtiThreadState_lock);
973    JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
974  }
975}
976
977void
978JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env,
979                                                   jint extension_event_index,
980                                                   jvmtiExtensionEvent callback) {
981  if (Threads::number_of_threads() == 0) {
982    JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
983  } else {
984    MutexLocker mu(JvmtiThreadState_lock);
985    JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
986  }
987}
988
989
990
991
992void
993JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
994  MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
995  JvmtiEventControllerPrivate::set_frame_pop(ets, fpop);
996}
997
998
999void
1000JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1001  MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1002  JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop);
1003}
1004
1005
1006void
1007JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
1008  MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock);
1009  JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop);
1010}
1011
1012void
1013JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) {
1014  MutexLocker mu(JvmtiThreadState_lock);
1015  JvmtiEventControllerPrivate::change_field_watch(event_type, added);
1016}
1017
1018void
1019JvmtiEventController::thread_started(JavaThread *thread) {
1020  // operates only on the current thread
1021  // JvmtiThreadState_lock grabbed only if needed.
1022  JvmtiEventControllerPrivate::thread_started(thread);
1023}
1024
1025void
1026JvmtiEventController::thread_ended(JavaThread *thread) {
1027  // operates only on the current thread
1028  // JvmtiThreadState_lock grabbed only if needed.
1029  JvmtiEventControllerPrivate::thread_ended(thread);
1030}
1031
1032void
1033JvmtiEventController::env_initialize(JvmtiEnvBase *env) {
1034  if (Threads::number_of_threads() == 0) {
1035    // during early VM start-up locks don't exist, but we are safely single threaded,
1036    // call the functionality without holding the JvmtiThreadState_lock.
1037    JvmtiEventControllerPrivate::env_initialize(env);
1038  } else {
1039    MutexLocker mu(JvmtiThreadState_lock);
1040    JvmtiEventControllerPrivate::env_initialize(env);
1041  }
1042}
1043
1044void
1045JvmtiEventController::env_dispose(JvmtiEnvBase *env) {
1046  if (Threads::number_of_threads() == 0) {
1047    // during early VM start-up locks don't exist, but we are safely single threaded,
1048    // call the functionality without holding the JvmtiThreadState_lock.
1049    JvmtiEventControllerPrivate::env_dispose(env);
1050  } else {
1051    MutexLocker mu(JvmtiThreadState_lock);
1052    JvmtiEventControllerPrivate::env_dispose(env);
1053  }
1054}
1055
1056
1057void
1058JvmtiEventController::vm_start() {
1059  if (JvmtiEnvBase::environments_might_exist()) {
1060    MutexLocker mu(JvmtiThreadState_lock);
1061    JvmtiEventControllerPrivate::vm_start();
1062  }
1063}
1064
1065void
1066JvmtiEventController::vm_init() {
1067  if (JvmtiEnvBase::environments_might_exist()) {
1068    MutexLocker mu(JvmtiThreadState_lock);
1069    JvmtiEventControllerPrivate::vm_init();
1070  }
1071}
1072
1073void
1074JvmtiEventController::vm_death() {
1075  if (JvmtiEnvBase::environments_might_exist()) {
1076    MutexLocker mu(JvmtiThreadState_lock);
1077    JvmtiEventControllerPrivate::vm_death();
1078  }
1079}
1080