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src/share/vm/prims/jvmtiEventController.cpp@ea20d7ce26b0
src/share/vm/prims/jvmtiEventController.cpp
Mon, 02 Mar 2009 14:00:23 -0700
- author
- dcubed
- date
- Mon, 02 Mar 2009 14:00:23 -0700
- changeset 1044
- ea20d7ce26b0
- parent 435
- a61af66fc99e
- child 1648
- 6deeaebad47a
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- -rw-r--r--
6800721: 3/4 JavaThread::jvmti_thread_state() and JvmtiThreadState::state_for() robustness
Summary: Check for NULL return values from jvmti_thread_state() and state_for() and return a JVM TI error code as appropriate.
Reviewed-by: coleenp, swamyv
1 /*
2 * Copyright 2003-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 # include "incls/_precompiled.incl"
26 # include "incls/_jvmtiEventController.cpp.incl"
28 #ifdef JVMTI_TRACE
29 #define EC_TRACE(out) if (JvmtiTrace::trace_event_controller()) { SafeResourceMark rm; tty->print_cr out; } while (0)
30 #else
31 #define EC_TRACE(out)
32 #endif /*JVMTI_TRACE */
34 // bits for standard events
36 static const jlong SINGLE_STEP_BIT = (((jlong)1) << (JVMTI_EVENT_SINGLE_STEP - TOTAL_MIN_EVENT_TYPE_VAL));
37 static const jlong FRAME_POP_BIT = (((jlong)1) << (JVMTI_EVENT_FRAME_POP - TOTAL_MIN_EVENT_TYPE_VAL));
38 static const jlong BREAKPOINT_BIT = (((jlong)1) << (JVMTI_EVENT_BREAKPOINT - TOTAL_MIN_EVENT_TYPE_VAL));
39 static const jlong FIELD_ACCESS_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_ACCESS - TOTAL_MIN_EVENT_TYPE_VAL));
40 static const jlong FIELD_MODIFICATION_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_MODIFICATION - TOTAL_MIN_EVENT_TYPE_VAL));
41 static const jlong METHOD_ENTRY_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_ENTRY - TOTAL_MIN_EVENT_TYPE_VAL));
42 static const jlong METHOD_EXIT_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_EXIT - TOTAL_MIN_EVENT_TYPE_VAL));
43 static const jlong CLASS_FILE_LOAD_HOOK_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_FILE_LOAD_HOOK - TOTAL_MIN_EVENT_TYPE_VAL));
44 static const jlong NATIVE_METHOD_BIND_BIT = (((jlong)1) << (JVMTI_EVENT_NATIVE_METHOD_BIND - TOTAL_MIN_EVENT_TYPE_VAL));
45 static const jlong VM_START_BIT = (((jlong)1) << (JVMTI_EVENT_VM_START - TOTAL_MIN_EVENT_TYPE_VAL));
46 static const jlong VM_INIT_BIT = (((jlong)1) << (JVMTI_EVENT_VM_INIT - TOTAL_MIN_EVENT_TYPE_VAL));
47 static const jlong VM_DEATH_BIT = (((jlong)1) << (JVMTI_EVENT_VM_DEATH - TOTAL_MIN_EVENT_TYPE_VAL));
48 static const jlong CLASS_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_LOAD - TOTAL_MIN_EVENT_TYPE_VAL));
49 static const jlong CLASS_PREPARE_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_PREPARE - TOTAL_MIN_EVENT_TYPE_VAL));
50 static const jlong THREAD_START_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_START - TOTAL_MIN_EVENT_TYPE_VAL));
51 static const jlong THREAD_END_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_END - TOTAL_MIN_EVENT_TYPE_VAL));
52 static const jlong EXCEPTION_THROW_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION - TOTAL_MIN_EVENT_TYPE_VAL));
53 static const jlong EXCEPTION_CATCH_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION_CATCH - TOTAL_MIN_EVENT_TYPE_VAL));
54 static const jlong MONITOR_CONTENDED_ENTER_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTER - TOTAL_MIN_EVENT_TYPE_VAL));
55 static const jlong MONITOR_CONTENDED_ENTERED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTERED - TOTAL_MIN_EVENT_TYPE_VAL));
56 static const jlong MONITOR_WAIT_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAIT - TOTAL_MIN_EVENT_TYPE_VAL));
57 static const jlong MONITOR_WAITED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAITED - TOTAL_MIN_EVENT_TYPE_VAL));
58 static const jlong DYNAMIC_CODE_GENERATED_BIT = (((jlong)1) << (JVMTI_EVENT_DYNAMIC_CODE_GENERATED - TOTAL_MIN_EVENT_TYPE_VAL));
59 static const jlong DATA_DUMP_BIT = (((jlong)1) << (JVMTI_EVENT_DATA_DUMP_REQUEST - TOTAL_MIN_EVENT_TYPE_VAL));
60 static const jlong COMPILED_METHOD_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_LOAD - TOTAL_MIN_EVENT_TYPE_VAL));
61 static const jlong COMPILED_METHOD_UNLOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
62 static const jlong GARBAGE_COLLECTION_START_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_START - TOTAL_MIN_EVENT_TYPE_VAL));
63 static const jlong GARBAGE_COLLECTION_FINISH_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_FINISH - TOTAL_MIN_EVENT_TYPE_VAL));
64 static const jlong OBJECT_FREE_BIT = (((jlong)1) << (JVMTI_EVENT_OBJECT_FREE - TOTAL_MIN_EVENT_TYPE_VAL));
65 static const jlong RESOURCE_EXHAUSTED_BIT = (((jlong)1) << (JVMTI_EVENT_RESOURCE_EXHAUSTED - TOTAL_MIN_EVENT_TYPE_VAL));
66 static const jlong VM_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_VM_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL));
68 // bits for extension events
69 static const jlong CLASS_UNLOAD_BIT = (((jlong)1) << (EXT_EVENT_CLASS_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL));
72 static const jlong MONITOR_BITS = MONITOR_CONTENDED_ENTER_BIT | MONITOR_CONTENDED_ENTERED_BIT |
73 MONITOR_WAIT_BIT | MONITOR_WAITED_BIT;
74 static const jlong EXCEPTION_BITS = EXCEPTION_THROW_BIT | EXCEPTION_CATCH_BIT;
75 static const jlong INTERP_EVENT_BITS = SINGLE_STEP_BIT | METHOD_ENTRY_BIT | METHOD_EXIT_BIT |
76 FRAME_POP_BIT | FIELD_ACCESS_BIT | FIELD_MODIFICATION_BIT;
77 static const jlong THREAD_FILTERED_EVENT_BITS = INTERP_EVENT_BITS | EXCEPTION_BITS | MONITOR_BITS |
78 BREAKPOINT_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | THREAD_END_BIT;
79 static const jlong NEED_THREAD_LIFE_EVENTS = THREAD_FILTERED_EVENT_BITS | THREAD_START_BIT;
80 static const jlong EARLY_EVENT_BITS = CLASS_FILE_LOAD_HOOK_BIT |
81 VM_START_BIT | VM_INIT_BIT | VM_DEATH_BIT | NATIVE_METHOD_BIND_BIT |
82 THREAD_START_BIT | THREAD_END_BIT |
83 DYNAMIC_CODE_GENERATED_BIT;
84 static const jlong GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS;
87 ///////////////////////////////////////////////////////////////
88 //
89 // JvmtiEventEnabled
90 //
92 JvmtiEventEnabled::JvmtiEventEnabled() {
93 clear();
94 }
97 void JvmtiEventEnabled::clear() {
98 _enabled_bits = 0;
99 #ifndef PRODUCT
100 _init_guard = JEE_INIT_GUARD;
101 #endif
102 }
104 void JvmtiEventEnabled::set_enabled(jvmtiEvent event_type, bool enabled) {
105 jlong bits = get_bits();
106 jlong mask = bit_for(event_type);
107 if (enabled) {
108 bits |= mask;
109 } else {
110 bits &= ~mask;
111 }
112 set_bits(bits);
113 }
116 ///////////////////////////////////////////////////////////////
117 //
118 // JvmtiEnvThreadEventEnable
119 //
121 JvmtiEnvThreadEventEnable::JvmtiEnvThreadEventEnable() {
122 _event_user_enabled.clear();
123 _event_enabled.clear();
124 }
127 JvmtiEnvThreadEventEnable::~JvmtiEnvThreadEventEnable() {
128 _event_user_enabled.clear();
129 _event_enabled.clear();
130 }
133 ///////////////////////////////////////////////////////////////
134 //
135 // JvmtiThreadEventEnable
136 //
138 JvmtiThreadEventEnable::JvmtiThreadEventEnable() {
139 _event_enabled.clear();
140 }
143 JvmtiThreadEventEnable::~JvmtiThreadEventEnable() {
144 _event_enabled.clear();
145 }
148 ///////////////////////////////////////////////////////////////
149 //
150 // JvmtiEnvEventEnable
151 //
153 JvmtiEnvEventEnable::JvmtiEnvEventEnable() {
154 _event_user_enabled.clear();
155 _event_callback_enabled.clear();
156 _event_enabled.clear();
157 }
160 JvmtiEnvEventEnable::~JvmtiEnvEventEnable() {
161 _event_user_enabled.clear();
162 _event_callback_enabled.clear();
163 _event_enabled.clear();
164 }
167 ///////////////////////////////////////////////////////////////
168 //
169 // VM_EnterInterpOnlyMode
170 //
172 class VM_EnterInterpOnlyMode : public VM_Operation {
173 private:
174 JvmtiThreadState *_state;
176 public:
177 VM_EnterInterpOnlyMode(JvmtiThreadState *state);
179 bool allow_nested_vm_operations() const { return true; }
180 VMOp_Type type() const { return VMOp_EnterInterpOnlyMode; }
181 void doit();
183 // to do: this same function is in jvmtiImpl - should be in one place
184 bool can_be_deoptimized(vframe* vf) {
185 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized());
186 }
187 };
189 VM_EnterInterpOnlyMode::VM_EnterInterpOnlyMode(JvmtiThreadState *state)
190 : _state(state)
191 {
192 }
195 void VM_EnterInterpOnlyMode::doit() {
196 // Set up the current stack depth for later tracking
197 _state->invalidate_cur_stack_depth();
199 _state->enter_interp_only_mode();
201 JavaThread *thread = _state->get_thread();
202 if (thread->has_last_Java_frame()) {
203 // If running in fullspeed mode, single stepping is implemented
204 // as follows: first, the interpreter does not dispatch to
205 // compiled code for threads that have single stepping enabled;
206 // second, we deoptimize all methods on the thread's stack when
207 // interpreted-only mode is enabled the first time for a given
208 // thread (nothing to do if no Java frames yet).
209 int num_marked = 0;
210 ResourceMark resMark;
211 RegisterMap rm(thread, false);
212 for (vframe* vf = thread->last_java_vframe(&rm); vf; vf = vf->sender()) {
213 if (can_be_deoptimized(vf)) {
214 ((compiledVFrame*) vf)->code()->mark_for_deoptimization();
215 ++num_marked;
216 }
217 }
218 if (num_marked > 0) {
219 VM_Deoptimize op;
220 VMThread::execute(&op);
221 }
222 }
223 }
226 ///////////////////////////////////////////////////////////////
227 //
228 // VM_ChangeSingleStep
229 //
231 class VM_ChangeSingleStep : public VM_Operation {
232 private:
233 bool _on;
235 public:
236 VM_ChangeSingleStep(bool on);
237 VMOp_Type type() const { return VMOp_ChangeSingleStep; }
238 bool allow_nested_vm_operations() const { return true; }
239 void doit(); // method definition is after definition of JvmtiEventControllerPrivate because of scoping
240 };
243 VM_ChangeSingleStep::VM_ChangeSingleStep(bool on)
244 : _on(on != 0)
245 {
246 }
251 ///////////////////////////////////////////////////////////////
252 //
253 // JvmtiEventControllerPrivate
254 //
255 // Private internal implementation methods for JvmtiEventController.
256 //
257 // These methods are thread safe either because they are called
258 // in early VM initialization which is single threaded, or they
259 // hold the JvmtiThreadState_lock.
260 //
262 class JvmtiEventControllerPrivate : public AllStatic {
263 static bool _initialized;
264 public:
265 static void set_should_post_single_step(bool on);
266 static void enter_interp_only_mode(JvmtiThreadState *state);
267 static void leave_interp_only_mode(JvmtiThreadState *state);
268 static void recompute_enabled();
269 static jlong recompute_env_enabled(JvmtiEnvBase* env);
270 static jlong recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state);
271 static jlong recompute_thread_enabled(JvmtiThreadState *state);
272 static void event_init();
274 static void set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
275 jvmtiEvent event_type, bool enabled);
276 static void set_event_callbacks(JvmtiEnvBase *env,
277 const jvmtiEventCallbacks* callbacks,
278 jint size_of_callbacks);
280 static void set_extension_event_callback(JvmtiEnvBase *env,
281 jint extension_event_index,
282 jvmtiExtensionEvent callback);
284 static void set_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
285 static void clear_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
286 static void clear_to_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop);
287 static void change_field_watch(jvmtiEvent event_type, bool added);
289 static void thread_started(JavaThread *thread);
290 static void thread_ended(JavaThread *thread);
292 static void env_initialize(JvmtiEnvBase *env);
293 static void env_dispose(JvmtiEnvBase *env);
295 static void vm_start();
296 static void vm_init();
297 static void vm_death();
299 static void trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed);
300 static void trace_changed(jlong now_enabled, jlong changed);
301 };
303 bool JvmtiEventControllerPrivate::_initialized = false;
305 void JvmtiEventControllerPrivate::set_should_post_single_step(bool on) {
306 // we have permission to do this, VM op doesn't
307 JvmtiExport::set_should_post_single_step(on);
308 }
311 // This change must always be occur when at a safepoint.
312 // Being at a safepoint causes the interpreter to use the
313 // safepoint dispatch table which we overload to find single
314 // step points. Just to be sure that it has been set, we
315 // call notice_safepoints when turning on single stepping.
316 // When we leave our current safepoint, should_post_single_step
317 // will be checked by the interpreter, and the table kept
318 // or changed accordingly.
319 void VM_ChangeSingleStep::doit() {
320 JvmtiEventControllerPrivate::set_should_post_single_step(_on);
321 if (_on) {
322 Interpreter::notice_safepoints();
323 }
324 }
327 void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) {
328 EC_TRACE(("JVMTI [%s] # Entering interpreter only mode",
329 JvmtiTrace::safe_get_thread_name(state->get_thread())));
331 VM_EnterInterpOnlyMode op(state);
332 VMThread::execute(&op);
333 }
336 void
337 JvmtiEventControllerPrivate::leave_interp_only_mode(JvmtiThreadState *state) {
338 EC_TRACE(("JVMTI [%s] # Leaving interpreter only mode",
339 JvmtiTrace::safe_get_thread_name(state->get_thread())));
340 state->leave_interp_only_mode();
341 }
344 void
345 JvmtiEventControllerPrivate::trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed) {
346 #ifdef JVMTI_TRACE
347 if (JvmtiTrace::trace_event_controller()) {
348 SafeResourceMark rm;
349 // traces standard events only
350 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
351 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
352 if (changed & bit) {
353 // it changed, print it
354 tty->print_cr("JVMTI [%s] # %s event %s",
355 JvmtiTrace::safe_get_thread_name(state->get_thread()),
356 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
357 }
358 }
359 }
360 #endif /*JVMTI_TRACE */
361 }
364 void
365 JvmtiEventControllerPrivate::trace_changed(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 tty->print_cr("JVMTI [-] # %s event %s",
375 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei));
376 }
377 }
378 }
379 #endif /*JVMTI_TRACE */
380 }
383 // For the specified env: compute the currently truly enabled events
384 // set external state accordingly.
385 // Return value and set value must include all events.
386 // But outside this class, only non-thread-filtered events can be queried..
387 jlong
388 JvmtiEventControllerPrivate::recompute_env_enabled(JvmtiEnvBase* env) {
389 jlong was_enabled = env->env_event_enable()->_event_enabled.get_bits();
390 jlong now_enabled =
391 env->env_event_enable()->_event_callback_enabled.get_bits() &
392 env->env_event_enable()->_event_user_enabled.get_bits();
394 switch (JvmtiEnv::get_phase()) {
395 case JVMTI_PHASE_PRIMORDIAL:
396 case JVMTI_PHASE_ONLOAD:
397 // only these events allowed in primordial or onload phase
398 now_enabled &= (EARLY_EVENT_BITS & ~THREAD_FILTERED_EVENT_BITS);
399 break;
400 case JVMTI_PHASE_START:
401 // only these events allowed in start phase
402 now_enabled &= EARLY_EVENT_BITS;
403 break;
404 case JVMTI_PHASE_LIVE:
405 // all events allowed during live phase
406 break;
407 case JVMTI_PHASE_DEAD:
408 // no events allowed when dead
409 now_enabled = 0;
410 break;
411 default:
412 assert(false, "no other phases - sanity check");
413 break;
414 }
416 // will we really send these events to this env
417 env->env_event_enable()->_event_enabled.set_bits(now_enabled);
419 trace_changed(now_enabled, (now_enabled ^ was_enabled) & ~THREAD_FILTERED_EVENT_BITS);
421 return now_enabled;
422 }
425 // For the specified env and thread: compute the currently truly enabled events
426 // set external state accordingly. Only thread-filtered events are included.
427 jlong
428 JvmtiEventControllerPrivate::recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state) {
429 JvmtiEnv *env = ets->get_env();
431 jlong was_enabled = ets->event_enable()->_event_enabled.get_bits();
432 jlong now_enabled = THREAD_FILTERED_EVENT_BITS &
433 env->env_event_enable()->_event_callback_enabled.get_bits() &
434 (env->env_event_enable()->_event_user_enabled.get_bits() |
435 ets->event_enable()->_event_user_enabled.get_bits());
437 // for frame pops and field watchs, computed enabled state
438 // is only true if an event has been requested
439 if (!ets->has_frame_pops()) {
440 now_enabled &= ~FRAME_POP_BIT;
441 }
442 if (*((int *)JvmtiExport::get_field_access_count_addr()) == 0) {
443 now_enabled &= ~FIELD_ACCESS_BIT;
444 }
445 if (*((int *)JvmtiExport::get_field_modification_count_addr()) == 0) {
446 now_enabled &= ~FIELD_MODIFICATION_BIT;
447 }
449 switch (JvmtiEnv::get_phase()) {
450 case JVMTI_PHASE_DEAD:
451 // no events allowed when dead
452 now_enabled = 0;
453 break;
454 }
456 // if anything changed do update
457 if (now_enabled != was_enabled) {
459 // will we really send these events to this thread x env
460 ets->event_enable()->_event_enabled.set_bits(now_enabled);
462 // If the enabled status of the single step or breakpoint events changed,
463 // the location status may need to change as well.
464 jlong changed = now_enabled ^ was_enabled;
465 if (changed & SINGLE_STEP_BIT) {
466 ets->reset_current_location(JVMTI_EVENT_SINGLE_STEP, (now_enabled & SINGLE_STEP_BIT) != 0);
467 }
468 if (changed & BREAKPOINT_BIT) {
469 ets->reset_current_location(JVMTI_EVENT_BREAKPOINT, (now_enabled & BREAKPOINT_BIT) != 0);
470 }
471 trace_changed(state, now_enabled, changed);
472 }
473 return now_enabled;
474 }
477 // For the specified thread: compute the currently truly enabled events
478 // set external state accordingly. Only thread-filtered events are included.
479 jlong
480 JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) {
481 if (state == NULL) {
482 // associated JavaThread is exiting
483 return (jlong)0;
484 }
486 jlong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits();
487 jlong any_env_enabled = 0;
489 {
490 // This iteration will include JvmtiEnvThreadStates whoses environments
491 // have been disposed. These JvmtiEnvThreadStates must not be filtered
492 // as recompute must be called on them to disable their events,
493 JvmtiEnvThreadStateIterator it(state);
494 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
495 any_env_enabled |= recompute_env_thread_enabled(ets, state);
496 }
497 }
499 if (any_env_enabled != was_any_env_enabled) {
500 // mark if event is truly enabled on this thread in any environment
501 state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled);
503 // compute interp_only mode
504 bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0;
505 bool is_now_interp = state->is_interp_only_mode();
507 if (should_be_interp != is_now_interp) {
508 if (should_be_interp) {
509 enter_interp_only_mode(state);
510 } else {
511 leave_interp_only_mode(state);
512 }
513 }
514 }
515 return any_env_enabled;
516 }
519 // Compute truly enabled events - meaning if the event can and could be
520 // sent. An event is truly enabled if it is user enabled on the thread
521 // or globally user enabled, but only if there is a callback or event hook
522 // for it and, for field watch and frame pop, one has been set.
523 // Compute if truly enabled, per thread, per environment, per combination
524 // (thread x environment), and overall. These merges are true if any is true.
525 // True per thread if some environment has callback set and the event is globally
526 // enabled or enabled for this thread.
527 // True per environment if the callback is set and the event is globally
528 // enabled in this environment or enabled for any thread in this environment.
529 // True per combination if the environment has the callback set and the
530 // event is globally enabled in this environment or the event is enabled
531 // for this thread and environment.
532 //
533 // All states transitions dependent on these transitions are also handled here.
534 void
535 JvmtiEventControllerPrivate::recompute_enabled() {
536 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
538 // event enabled for any thread in any environment
539 jlong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits();
540 jlong any_env_thread_enabled = 0;
542 EC_TRACE(("JVMTI [-] # recompute enabled - before %llx", was_any_env_thread_enabled));
544 // compute non-thread-filters events.
545 // This must be done separately from thread-filtered events, since some
546 // events can occur before any threads exist.
547 JvmtiEnvIterator it;
548 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
549 any_env_thread_enabled |= recompute_env_enabled(env);
550 }
552 // We need to create any missing jvmti_thread_state if there are globally set thread
553 // filtered events and there weren't last time
554 if ( (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 &&
555 (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) {
556 assert(JvmtiEnv::is_vm_live() || (JvmtiEnv::get_phase()==JVMTI_PHASE_START),
557 "thread filtered events should not be enabled when VM not in start or live phase");
558 {
559 MutexLocker mu(Threads_lock); //hold the Threads_lock for the iteration
560 for (JavaThread *tp = Threads::first(); tp != NULL; tp = tp->next()) {
561 // state_for_while_locked() makes tp->is_exiting() check
562 JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing
563 }
564 }// release Threads_lock
565 }
567 // compute and set thread-filtered events
568 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
569 any_env_thread_enabled |= recompute_thread_enabled(state);
570 }
572 // set universal state (across all envs and threads)
573 jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled;
574 if (delta != 0) {
575 JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0);
576 JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0);
577 JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0);
578 JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0);
579 JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0);
580 JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0);
581 JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0);
582 JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0);
583 JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0);
584 JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0);
585 JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0);
586 JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0);
587 JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0);
588 JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0);
589 JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0);
590 JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0);
591 JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0);
592 JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0);
593 JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0);
594 JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0);
596 // need this if we want thread events or we need them to init data
597 JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0);
599 // If single stepping is turned on or off, execute the VM op to change it.
600 if (delta & SINGLE_STEP_BIT) {
601 switch (JvmtiEnv::get_phase()) {
602 case JVMTI_PHASE_DEAD:
603 // If the VM is dying we can't execute VM ops
604 break;
605 case JVMTI_PHASE_LIVE: {
606 VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0);
607 VMThread::execute(&op);
608 break;
609 }
610 default:
611 assert(false, "should never come here before live phase");
612 break;
613 }
614 }
616 // set global truly enabled, that is, any thread in any environment
617 JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled);
618 }
620 EC_TRACE(("JVMTI [-] # recompute enabled - after %llx", any_env_thread_enabled));
621 }
624 void
625 JvmtiEventControllerPrivate::thread_started(JavaThread *thread) {
626 assert(thread->is_Java_thread(), "Must be JavaThread");
627 assert(thread == Thread::current(), "must be current thread");
628 assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist");
630 EC_TRACE(("JVMTI [%s] # thread started", JvmtiTrace::safe_get_thread_name(thread)));
632 // if we have any thread filtered events globally enabled, create/update the thread state
633 if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) {
634 MutexLocker mu(JvmtiThreadState_lock);
635 // create the thread state if missing
636 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
637 if (state != NULL) { // skip threads with no JVMTI thread state
638 recompute_thread_enabled(state);
639 }
640 }
641 }
644 void
645 JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) {
646 // Removes the JvmtiThreadState associated with the specified thread.
647 // May be called after all environments have been disposed.
649 EC_TRACE(("JVMTI [%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread)));
651 JvmtiThreadState *state = thread->jvmti_thread_state();
652 if (state != NULL) {
653 MutexLocker mu(JvmtiThreadState_lock);
654 delete state;
655 }
656 }
658 void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env,
659 const jvmtiEventCallbacks* callbacks,
660 jint size_of_callbacks) {
661 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
662 EC_TRACE(("JVMTI [*] # set event callbacks"));
664 env->set_event_callbacks(callbacks, size_of_callbacks);
665 jlong enabled_bits = 0;
666 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
667 jvmtiEvent evt_t = (jvmtiEvent)ei;
668 if (env->has_callback(evt_t)) {
669 enabled_bits |= JvmtiEventEnabled::bit_for(evt_t);
670 }
671 }
672 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
673 recompute_enabled();
674 }
676 void
677 JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env,
678 jint extension_event_index,
679 jvmtiExtensionEvent callback)
680 {
681 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
682 EC_TRACE(("JVMTI [*] # set extension event callback"));
684 // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL
685 assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL &&
686 extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check");
689 // As the bits for both standard (jvmtiEvent) and extension
690 // (jvmtiExtEvents) are stored in the same word we cast here to
691 // jvmtiEvent to set/clear the bit for this extension event.
692 jvmtiEvent event_type = (jvmtiEvent)extension_event_index;
694 // Prevent a possible race condition where events are re-enabled by a call to
695 // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate
696 // environment check and before the lock is acquired.
697 // We can safely do the is_valid check now, as JvmtiThreadState_lock is held.
698 bool enabling = (callback != NULL) && (env->is_valid());
699 env->env_event_enable()->set_user_enabled(event_type, enabling);
701 // update the callback
702 jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks();
703 switch (extension_event_index) {
704 case EXT_EVENT_CLASS_UNLOAD :
705 ext_callbacks->ClassUnload = callback;
706 break;
707 default:
708 ShouldNotReachHere();
709 }
711 // update the callback enable/disable bit
712 jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits();
713 jlong bit_for = JvmtiEventEnabled::bit_for(event_type);
714 if (enabling) {
715 enabled_bits |= bit_for;
716 } else {
717 enabled_bits &= ~bit_for;
718 }
719 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits);
721 recompute_enabled();
722 }
725 void
726 JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) {
727 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
728 EC_TRACE(("JVMTI [*] # env initialize"));
730 if (JvmtiEnvBase::is_vm_live()) {
731 // if we didn't initialize event info already (this is a late
732 // launched environment), do it now.
733 event_init();
734 }
736 env->initialize();
738 // add the JvmtiEnvThreadState to each JvmtiThreadState
739 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) {
740 state->add_env(env);
741 assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check");
742 }
743 JvmtiEventControllerPrivate::recompute_enabled();
744 }
747 void
748 JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) {
749 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
750 EC_TRACE(("JVMTI [*] # env dispose"));
752 // Before the environment is marked disposed, disable all events on this
753 // environment (by zapping the callbacks). As a result, the disposed
754 // environment will not call event handlers.
755 set_event_callbacks(env, NULL, 0);
756 for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL;
757 extension_event_index <= EXT_MAX_EVENT_TYPE_VAL;
758 ++extension_event_index) {
759 set_extension_event_callback(env, extension_event_index, NULL);
760 }
762 // Let the environment finish disposing itself.
763 env->env_dispose();
764 }
767 void
768 JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread,
769 jvmtiEvent event_type, bool enabled) {
770 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
772 EC_TRACE(("JVMTI [%s] # user %s event %s",
773 thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread),
774 enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type)));
776 if (thread == NULL) {
777 env->env_event_enable()->set_user_enabled(event_type, enabled);
778 } else {
779 // create the thread state (if it didn't exist before)
780 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread);
781 if (state != NULL) {
782 state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled);
783 }
784 }
785 recompute_enabled();
786 }
789 void
790 JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
791 EC_TRACE(("JVMTI [%s] # set frame pop - frame=%d",
792 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
793 fpop.frame_number() ));
795 ets->get_frame_pops()->set(fpop);
796 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
797 }
800 void
801 JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
802 EC_TRACE(("JVMTI [%s] # clear frame pop - frame=%d",
803 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
804 fpop.frame_number() ));
806 ets->get_frame_pops()->clear(fpop);
807 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
808 }
811 void
812 JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
813 int cleared_cnt = ets->get_frame_pops()->clear_to(fpop);
815 EC_TRACE(("JVMTI [%s] # clear to frame pop - frame=%d, count=%d",
816 JvmtiTrace::safe_get_thread_name(ets->get_thread()),
817 fpop.frame_number(),
818 cleared_cnt ));
820 if (cleared_cnt > 0) {
821 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state());
822 }
823 }
825 void
826 JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) {
827 int *count_addr;
829 switch (event_type) {
830 case JVMTI_EVENT_FIELD_MODIFICATION:
831 count_addr = (int *)JvmtiExport::get_field_modification_count_addr();
832 break;
833 case JVMTI_EVENT_FIELD_ACCESS:
834 count_addr = (int *)JvmtiExport::get_field_access_count_addr();
835 break;
836 default:
837 assert(false, "incorrect event");
838 return;
839 }
841 EC_TRACE(("JVMTI [-] # change field watch - %s %s count=%d",
842 event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access",
843 added? "add" : "remove",
844 *count_addr));
846 if (added) {
847 (*count_addr)++;
848 if (*count_addr == 1) {
849 recompute_enabled();
850 }
851 } else {
852 if (*count_addr > 0) {
853 (*count_addr)--;
854 if (*count_addr == 0) {
855 recompute_enabled();
856 }
857 } else {
858 assert(false, "field watch out of phase");
859 }
860 }
861 }
863 void
864 JvmtiEventControllerPrivate::event_init() {
865 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
867 if (_initialized) {
868 return;
869 }
871 EC_TRACE(("JVMTI [-] # VM live"));
873 #ifdef ASSERT
874 // check that our idea and the spec's idea of threaded events match
875 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) {
876 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei);
877 assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei),
878 "thread filtered event list does not match");
879 }
880 #endif
882 _initialized = true;
883 }
885 void
886 JvmtiEventControllerPrivate::vm_start() {
887 // some events are now able to be enabled (phase has changed)
888 JvmtiEventControllerPrivate::recompute_enabled();
889 }
892 void
893 JvmtiEventControllerPrivate::vm_init() {
894 event_init();
896 // all the events are now able to be enabled (phase has changed)
897 JvmtiEventControllerPrivate::recompute_enabled();
898 }
901 void
902 JvmtiEventControllerPrivate::vm_death() {
903 // events are disabled (phase has changed)
904 JvmtiEventControllerPrivate::recompute_enabled();
905 }
908 ///////////////////////////////////////////////////////////////
909 //
910 // JvmtiEventController
911 //
913 JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled;
915 bool
916 JvmtiEventController::is_global_event(jvmtiEvent event_type) {
917 assert(is_valid_event_type(event_type), "invalid event type");
918 jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL);
919 return((bit_for & GLOBAL_EVENT_BITS)!=0);
920 }
922 void
923 JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) {
924 if (Threads::number_of_threads() == 0) {
925 // during early VM start-up locks don't exist, but we are safely single threaded,
926 // call the functionality without holding the JvmtiThreadState_lock.
927 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
928 } else {
929 MutexLocker mu(JvmtiThreadState_lock);
930 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled);
931 }
932 }
935 void
936 JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env,
937 const jvmtiEventCallbacks* callbacks,
938 jint size_of_callbacks) {
939 if (Threads::number_of_threads() == 0) {
940 // during early VM start-up locks don't exist, but we are safely single threaded,
941 // call the functionality without holding the JvmtiThreadState_lock.
942 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
943 } else {
944 MutexLocker mu(JvmtiThreadState_lock);
945 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks);
946 }
947 }
949 void
950 JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env,
951 jint extension_event_index,
952 jvmtiExtensionEvent callback) {
953 if (Threads::number_of_threads() == 0) {
954 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
955 } else {
956 MutexLocker mu(JvmtiThreadState_lock);
957 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback);
958 }
959 }
964 void
965 JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
966 MutexLocker mu(JvmtiThreadState_lock);
967 JvmtiEventControllerPrivate::set_frame_pop(ets, fpop);
968 }
971 void
972 JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
973 MutexLocker mu(JvmtiThreadState_lock);
974 JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop);
975 }
978 void
979 JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) {
980 MutexLocker mu(JvmtiThreadState_lock);
981 JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop);
982 }
984 void
985 JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) {
986 MutexLocker mu(JvmtiThreadState_lock);
987 JvmtiEventControllerPrivate::change_field_watch(event_type, added);
988 }
990 void
991 JvmtiEventController::thread_started(JavaThread *thread) {
992 // operates only on the current thread
993 // JvmtiThreadState_lock grabbed only if needed.
994 JvmtiEventControllerPrivate::thread_started(thread);
995 }
997 void
998 JvmtiEventController::thread_ended(JavaThread *thread) {
999 // operates only on the current thread
1000 // JvmtiThreadState_lock grabbed only if needed.
1001 JvmtiEventControllerPrivate::thread_ended(thread);
1002 }
1004 void
1005 JvmtiEventController::env_initialize(JvmtiEnvBase *env) {
1006 if (Threads::number_of_threads() == 0) {
1007 // during early VM start-up locks don't exist, but we are safely single threaded,
1008 // call the functionality without holding the JvmtiThreadState_lock.
1009 JvmtiEventControllerPrivate::env_initialize(env);
1010 } else {
1011 MutexLocker mu(JvmtiThreadState_lock);
1012 JvmtiEventControllerPrivate::env_initialize(env);
1013 }
1014 }
1016 void
1017 JvmtiEventController::env_dispose(JvmtiEnvBase *env) {
1018 if (Threads::number_of_threads() == 0) {
1019 // during early VM start-up locks don't exist, but we are safely single threaded,
1020 // call the functionality without holding the JvmtiThreadState_lock.
1021 JvmtiEventControllerPrivate::env_dispose(env);
1022 } else {
1023 MutexLocker mu(JvmtiThreadState_lock);
1024 JvmtiEventControllerPrivate::env_dispose(env);
1025 }
1026 }
1029 void
1030 JvmtiEventController::vm_start() {
1031 if (JvmtiEnvBase::environments_might_exist()) {
1032 MutexLocker mu(JvmtiThreadState_lock);
1033 JvmtiEventControllerPrivate::vm_start();
1034 }
1035 }
1037 void
1038 JvmtiEventController::vm_init() {
1039 if (JvmtiEnvBase::environments_might_exist()) {
1040 MutexLocker mu(JvmtiThreadState_lock);
1041 JvmtiEventControllerPrivate::vm_init();
1042 }
1043 }
1045 void
1046 JvmtiEventController::vm_death() {
1047 if (JvmtiEnvBase::environments_might_exist()) {
1048 MutexLocker mu(JvmtiThreadState_lock);
1049 JvmtiEventControllerPrivate::vm_death();
1050 }
1051 }
