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 55 static const jlong SINGLE_STEP_BIT = (((jlong)1) << (JVMTI_EVENT_SINGLE_STEP - TOTAL_MIN_EVENT_TYPE_VAL)); 56 static const jlong FRAME_POP_BIT = (((jlong)1) << (JVMTI_EVENT_FRAME_POP - TOTAL_MIN_EVENT_TYPE_VAL)); 57 static const jlong BREAKPOINT_BIT = (((jlong)1) << (JVMTI_EVENT_BREAKPOINT - TOTAL_MIN_EVENT_TYPE_VAL)); 58 static const jlong FIELD_ACCESS_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_ACCESS - TOTAL_MIN_EVENT_TYPE_VAL)); 59 static const jlong FIELD_MODIFICATION_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_MODIFICATION - TOTAL_MIN_EVENT_TYPE_VAL)); 60 static const jlong METHOD_ENTRY_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_ENTRY - TOTAL_MIN_EVENT_TYPE_VAL)); 61 static const jlong METHOD_EXIT_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_EXIT - TOTAL_MIN_EVENT_TYPE_VAL)); 62 static const jlong CLASS_FILE_LOAD_HOOK_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_FILE_LOAD_HOOK - TOTAL_MIN_EVENT_TYPE_VAL)); 63 static const jlong NATIVE_METHOD_BIND_BIT = (((jlong)1) << (JVMTI_EVENT_NATIVE_METHOD_BIND - TOTAL_MIN_EVENT_TYPE_VAL)); 64 static const jlong VM_START_BIT = (((jlong)1) << (JVMTI_EVENT_VM_START - TOTAL_MIN_EVENT_TYPE_VAL)); 65 static const jlong VM_INIT_BIT = (((jlong)1) << (JVMTI_EVENT_VM_INIT - TOTAL_MIN_EVENT_TYPE_VAL)); 66 static const jlong VM_DEATH_BIT = (((jlong)1) << (JVMTI_EVENT_VM_DEATH - TOTAL_MIN_EVENT_TYPE_VAL)); 67 static const jlong CLASS_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_LOAD - TOTAL_MIN_EVENT_TYPE_VAL)); 68 static const jlong CLASS_PREPARE_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_PREPARE - TOTAL_MIN_EVENT_TYPE_VAL)); 69 static const jlong THREAD_START_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_START - TOTAL_MIN_EVENT_TYPE_VAL)); 70 static const jlong THREAD_END_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_END - TOTAL_MIN_EVENT_TYPE_VAL)); 71 static const jlong EXCEPTION_THROW_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION - TOTAL_MIN_EVENT_TYPE_VAL)); 72 static const jlong EXCEPTION_CATCH_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION_CATCH - TOTAL_MIN_EVENT_TYPE_VAL)); 73 static const jlong MONITOR_CONTENDED_ENTER_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTER - TOTAL_MIN_EVENT_TYPE_VAL)); 74 static const jlong MONITOR_CONTENDED_ENTERED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTERED - TOTAL_MIN_EVENT_TYPE_VAL)); 75 static const jlong MONITOR_WAIT_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAIT - TOTAL_MIN_EVENT_TYPE_VAL)); 76 static const jlong MONITOR_WAITED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAITED - TOTAL_MIN_EVENT_TYPE_VAL)); 77 static const jlong DYNAMIC_CODE_GENERATED_BIT = (((jlong)1) << (JVMTI_EVENT_DYNAMIC_CODE_GENERATED - TOTAL_MIN_EVENT_TYPE_VAL)); 78 static const jlong DATA_DUMP_BIT = (((jlong)1) << (JVMTI_EVENT_DATA_DUMP_REQUEST - TOTAL_MIN_EVENT_TYPE_VAL)); 79 static const jlong COMPILED_METHOD_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_LOAD - TOTAL_MIN_EVENT_TYPE_VAL)); 80 static const jlong COMPILED_METHOD_UNLOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL)); 81 static const jlong GARBAGE_COLLECTION_START_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_START - TOTAL_MIN_EVENT_TYPE_VAL)); 82 static const jlong GARBAGE_COLLECTION_FINISH_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_FINISH - TOTAL_MIN_EVENT_TYPE_VAL)); 83 static const jlong OBJECT_FREE_BIT = (((jlong)1) << (JVMTI_EVENT_OBJECT_FREE - TOTAL_MIN_EVENT_TYPE_VAL)); 84 static const jlong RESOURCE_EXHAUSTED_BIT = (((jlong)1) << (JVMTI_EVENT_RESOURCE_EXHAUSTED - TOTAL_MIN_EVENT_TYPE_VAL)); 85 static const jlong VM_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_VM_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL)); 86 87 // bits for extension events 88 static const jlong CLASS_UNLOAD_BIT = (((jlong)1) << (EXT_EVENT_CLASS_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL)); 89 90 91 static const jlong MONITOR_BITS = MONITOR_CONTENDED_ENTER_BIT | MONITOR_CONTENDED_ENTERED_BIT | 92 MONITOR_WAIT_BIT | MONITOR_WAITED_BIT; 93 static const jlong EXCEPTION_BITS = EXCEPTION_THROW_BIT | EXCEPTION_CATCH_BIT; 94 static const jlong INTERP_EVENT_BITS = SINGLE_STEP_BIT | METHOD_ENTRY_BIT | METHOD_EXIT_BIT | 95 FRAME_POP_BIT | FIELD_ACCESS_BIT | FIELD_MODIFICATION_BIT; 96 static 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; 98 static const jlong NEED_THREAD_LIFE_EVENTS = THREAD_FILTERED_EVENT_BITS | THREAD_START_BIT; 99 static 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; 104 static const jlong GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS; 105 static const jlong SHOULD_POST_ON_EXCEPTIONS_BITS = EXCEPTION_BITS | METHOD_EXIT_BIT | FRAME_POP_BIT; 106 107 /////////////////////////////////////////////////////////////// 108 // 109 // JvmtiEventEnabled 110 // 111 112 JvmtiEventEnabled::JvmtiEventEnabled() { 113 clear(); 114 } 115 116 117 void JvmtiEventEnabled::clear() { 118 _enabled_bits = 0; 119 #ifndef PRODUCT 120 _init_guard = JEE_INIT_GUARD; 121 #endif 122 } 123 124 void 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 // 140 141 JvmtiEnvThreadEventEnable::JvmtiEnvThreadEventEnable() { 142 _event_user_enabled.clear(); 143 _event_enabled.clear(); 144 } 145 146 147 JvmtiEnvThreadEventEnable::~JvmtiEnvThreadEventEnable() { 148 _event_user_enabled.clear(); 149 _event_enabled.clear(); 150 } 151 152 153 /////////////////////////////////////////////////////////////// 154 // 155 // JvmtiThreadEventEnable 156 // 157 158 JvmtiThreadEventEnable::JvmtiThreadEventEnable() { 159 _event_enabled.clear(); 160 } 161 162 163 JvmtiThreadEventEnable::~JvmtiThreadEventEnable() { 164 _event_enabled.clear(); 165 } 166 167 168 /////////////////////////////////////////////////////////////// 169 // 170 // JvmtiEnvEventEnable 171 // 172 173 JvmtiEnvEventEnable::JvmtiEnvEventEnable() { 174 _event_user_enabled.clear(); 175 _event_callback_enabled.clear(); 176 _event_enabled.clear(); 177 } 178 179 180 JvmtiEnvEventEnable::~JvmtiEnvEventEnable() { 181 _event_user_enabled.clear(); 182 _event_callback_enabled.clear(); 183 _event_enabled.clear(); 184 } 185 186 187 /////////////////////////////////////////////////////////////// 188 // 189 // VM_EnterInterpOnlyMode 190 // 191 192 class VM_EnterInterpOnlyMode : public VM_Operation { 193 private: 194 JvmtiThreadState *_state; 195 196 public: 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 }; 208 209 VM_EnterInterpOnlyMode::VM_EnterInterpOnlyMode(JvmtiThreadState *state) 210 : _state(state) 211 { 212 } 213 214 215 void 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 // 250 251 class VM_ChangeSingleStep : public VM_Operation { 252 private: 253 bool _on; 254 255 public: 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 }; 261 262 263 VM_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 // 281 282 class JvmtiEventControllerPrivate : public AllStatic { 283 static bool _initialized; 284 public: 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 }; 322 323 bool JvmtiEventControllerPrivate::_initialized = false; 324 325 void 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. 339 void VM_ChangeSingleStep::doit() { 340 JvmtiEventControllerPrivate::set_should_post_single_step(_on); 341 if (_on) { 342 Interpreter::notice_safepoints(); 343 } 344 } 345 346 347 void 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 } 354 355 356 void 357 JvmtiEventControllerPrivate::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 } 362 363 364 void 365 JvmtiEventControllerPrivate::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 } 382 383 384 void 385 JvmtiEventControllerPrivate::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.. 407 jlong 408 JvmtiEventControllerPrivate::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. 447 jlong 448 JvmtiEventControllerPrivate::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. 501 jlong 502 JvmtiEventControllerPrivate::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. 561 void 562 JvmtiEventControllerPrivate::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 } 651 652 653 void 654 JvmtiEventControllerPrivate::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 } 671 672 673 void 674 JvmtiEventControllerPrivate::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 } 685 686 void 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 } 703 704 void 705 JvmtiEventControllerPrivate::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 } 751 752 753 void 754 JvmtiEventControllerPrivate::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 } 773 774 775 void 776 JvmtiEventControllerPrivate::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 } 793 794 795 void 796 JvmtiEventControllerPrivate::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 } 815 816 817 void 818 JvmtiEventControllerPrivate::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 } 826 827 828 void 829 JvmtiEventControllerPrivate::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 } 837 838 839 void 840 JvmtiEventControllerPrivate::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 } 852 853 void 854 JvmtiEventControllerPrivate::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 } 890 891 void 892 JvmtiEventControllerPrivate::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 } 912 913 void 914 JvmtiEventControllerPrivate::vm_start() { 915 // some events are now able to be enabled (phase has changed) 916 JvmtiEventControllerPrivate::recompute_enabled(); 917 } 918 919 920 void 921 JvmtiEventControllerPrivate::vm_init() { 922 event_init(); 923 924 // all the events are now able to be enabled (phase has changed) 925 JvmtiEventControllerPrivate::recompute_enabled(); 926 } 927 928 929 void 930 JvmtiEventControllerPrivate::vm_death() { 931 // events are disabled (phase has changed) 932 JvmtiEventControllerPrivate::recompute_enabled(); 933 } 934 935 936 /////////////////////////////////////////////////////////////// 937 // 938 // JvmtiEventController 939 // 940 941 JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled; 942 943 bool 944 JvmtiEventController::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 } 949 950 void 951 JvmtiEventController::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 } 961 962 963 void 964 JvmtiEventController::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 } 976 977 void 978 JvmtiEventController::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 } 988 989 990 991 992 void 993 JvmtiEventController::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 } 997 998 999 void 1000 JvmtiEventController::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 1006 void 1007 JvmtiEventController::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 1012 void 1013 JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) { 1014 MutexLocker mu(JvmtiThreadState_lock); 1015 JvmtiEventControllerPrivate::change_field_watch(event_type, added); 1016 } 1017 1018 void 1019 JvmtiEventController::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 1025 void 1026 JvmtiEventController::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 1032 void 1033 JvmtiEventController::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 1044 void 1045 JvmtiEventController::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 1057 void 1058 JvmtiEventController::vm_start() { 1059 if (JvmtiEnvBase::environments_might_exist()) { 1060 MutexLocker mu(JvmtiThreadState_lock); 1061 JvmtiEventControllerPrivate::vm_start(); 1062 } 1063 } 1064 1065 void 1066 JvmtiEventController::vm_init() { 1067 if (JvmtiEnvBase::environments_might_exist()) { 1068 MutexLocker mu(JvmtiThreadState_lock); 1069 JvmtiEventControllerPrivate::vm_init(); 1070 } 1071 } 1072 1073 void 1074 JvmtiEventController::vm_death() { 1075 if (JvmtiEnvBase::environments_might_exist()) { 1076 MutexLocker mu(JvmtiThreadState_lock); 1077 JvmtiEventControllerPrivate::vm_death(); 1078 } 1079 }