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.inline.hpp" 37 #include "runtime/threadSMR.hpp" 38 #include "runtime/vframe.hpp" 39 #include "runtime/vframe_hp.hpp" 40 #include "runtime/vmThread.hpp" 41 #include "runtime/vm_operations.hpp" 42 43 #ifdef JVMTI_TRACE 44 #define EC_TRACE(out) do { \ 45 if (JvmtiTrace::trace_event_controller()) { \ 46 SafeResourceMark rm; \ 47 log_trace(jvmti) out; \ 48 } \ 49 } while (0) 50 #else 51 #define EC_TRACE(out) 52 #endif /*JVMTI_TRACE */ 53 54 // bits for standard events 55 56 static const jlong SINGLE_STEP_BIT = (((jlong)1) << (JVMTI_EVENT_SINGLE_STEP - TOTAL_MIN_EVENT_TYPE_VAL)); 57 static const jlong FRAME_POP_BIT = (((jlong)1) << (JVMTI_EVENT_FRAME_POP - TOTAL_MIN_EVENT_TYPE_VAL)); 58 static const jlong BREAKPOINT_BIT = (((jlong)1) << (JVMTI_EVENT_BREAKPOINT - TOTAL_MIN_EVENT_TYPE_VAL)); 59 static const jlong FIELD_ACCESS_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_ACCESS - TOTAL_MIN_EVENT_TYPE_VAL)); 60 static const jlong FIELD_MODIFICATION_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_MODIFICATION - TOTAL_MIN_EVENT_TYPE_VAL)); 61 static const jlong METHOD_ENTRY_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_ENTRY - TOTAL_MIN_EVENT_TYPE_VAL)); 62 static const jlong METHOD_EXIT_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_EXIT - TOTAL_MIN_EVENT_TYPE_VAL)); 63 static const jlong CLASS_FILE_LOAD_HOOK_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_FILE_LOAD_HOOK - TOTAL_MIN_EVENT_TYPE_VAL)); 64 static const jlong NATIVE_METHOD_BIND_BIT = (((jlong)1) << (JVMTI_EVENT_NATIVE_METHOD_BIND - TOTAL_MIN_EVENT_TYPE_VAL)); 65 static const jlong VM_START_BIT = (((jlong)1) << (JVMTI_EVENT_VM_START - TOTAL_MIN_EVENT_TYPE_VAL)); 66 static const jlong VM_INIT_BIT = (((jlong)1) << (JVMTI_EVENT_VM_INIT - TOTAL_MIN_EVENT_TYPE_VAL)); 67 static const jlong VM_DEATH_BIT = (((jlong)1) << (JVMTI_EVENT_VM_DEATH - TOTAL_MIN_EVENT_TYPE_VAL)); 68 static const jlong CLASS_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_LOAD - TOTAL_MIN_EVENT_TYPE_VAL)); 69 static const jlong CLASS_PREPARE_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_PREPARE - TOTAL_MIN_EVENT_TYPE_VAL)); 70 static const jlong THREAD_START_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_START - TOTAL_MIN_EVENT_TYPE_VAL)); 71 static const jlong THREAD_END_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_END - TOTAL_MIN_EVENT_TYPE_VAL)); 72 static const jlong EXCEPTION_THROW_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION - TOTAL_MIN_EVENT_TYPE_VAL)); 73 static const jlong EXCEPTION_CATCH_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION_CATCH - TOTAL_MIN_EVENT_TYPE_VAL)); 74 static const jlong MONITOR_CONTENDED_ENTER_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTER - TOTAL_MIN_EVENT_TYPE_VAL)); 75 static const jlong MONITOR_CONTENDED_ENTERED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTERED - TOTAL_MIN_EVENT_TYPE_VAL)); 76 static const jlong MONITOR_WAIT_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAIT - TOTAL_MIN_EVENT_TYPE_VAL)); 77 static const jlong MONITOR_WAITED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAITED - TOTAL_MIN_EVENT_TYPE_VAL)); 78 static const jlong DYNAMIC_CODE_GENERATED_BIT = (((jlong)1) << (JVMTI_EVENT_DYNAMIC_CODE_GENERATED - TOTAL_MIN_EVENT_TYPE_VAL)); 79 static const jlong DATA_DUMP_BIT = (((jlong)1) << (JVMTI_EVENT_DATA_DUMP_REQUEST - TOTAL_MIN_EVENT_TYPE_VAL)); 80 static const jlong COMPILED_METHOD_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_LOAD - TOTAL_MIN_EVENT_TYPE_VAL)); 81 static const jlong COMPILED_METHOD_UNLOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL)); 82 static const jlong GARBAGE_COLLECTION_START_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_START - TOTAL_MIN_EVENT_TYPE_VAL)); 83 static const jlong GARBAGE_COLLECTION_FINISH_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_FINISH - TOTAL_MIN_EVENT_TYPE_VAL)); 84 static const jlong OBJECT_FREE_BIT = (((jlong)1) << (JVMTI_EVENT_OBJECT_FREE - TOTAL_MIN_EVENT_TYPE_VAL)); 85 static const jlong RESOURCE_EXHAUSTED_BIT = (((jlong)1) << (JVMTI_EVENT_RESOURCE_EXHAUSTED - TOTAL_MIN_EVENT_TYPE_VAL)); 86 static const jlong VM_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_VM_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL)); 87 88 // bits for extension events 89 static const jlong CLASS_UNLOAD_BIT = (((jlong)1) << (EXT_EVENT_CLASS_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL)); 90 91 92 static const jlong MONITOR_BITS = MONITOR_CONTENDED_ENTER_BIT | MONITOR_CONTENDED_ENTERED_BIT | 93 MONITOR_WAIT_BIT | MONITOR_WAITED_BIT; 94 static const jlong EXCEPTION_BITS = EXCEPTION_THROW_BIT | EXCEPTION_CATCH_BIT; 95 static const jlong INTERP_EVENT_BITS = SINGLE_STEP_BIT | METHOD_ENTRY_BIT | METHOD_EXIT_BIT | 96 FRAME_POP_BIT | FIELD_ACCESS_BIT | FIELD_MODIFICATION_BIT; 97 static const jlong THREAD_FILTERED_EVENT_BITS = INTERP_EVENT_BITS | EXCEPTION_BITS | MONITOR_BITS | 98 BREAKPOINT_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | THREAD_END_BIT; 99 static const jlong NEED_THREAD_LIFE_EVENTS = THREAD_FILTERED_EVENT_BITS | THREAD_START_BIT; 100 static const jlong EARLY_EVENT_BITS = CLASS_FILE_LOAD_HOOK_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | 101 VM_START_BIT | VM_INIT_BIT | VM_DEATH_BIT | NATIVE_METHOD_BIND_BIT | 102 THREAD_START_BIT | THREAD_END_BIT | 103 COMPILED_METHOD_LOAD_BIT | COMPILED_METHOD_UNLOAD_BIT | 104 DYNAMIC_CODE_GENERATED_BIT; 105 static const jlong GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS; 106 static const jlong SHOULD_POST_ON_EXCEPTIONS_BITS = EXCEPTION_BITS | METHOD_EXIT_BIT | FRAME_POP_BIT; 107 108 /////////////////////////////////////////////////////////////// 109 // 110 // JvmtiEventEnabled 111 // 112 113 JvmtiEventEnabled::JvmtiEventEnabled() { 114 clear(); 115 } 116 117 118 void JvmtiEventEnabled::clear() { 119 _enabled_bits = 0; 120 #ifndef PRODUCT 121 _init_guard = JEE_INIT_GUARD; 122 #endif 123 } 124 125 void JvmtiEventEnabled::set_enabled(jvmtiEvent event_type, bool enabled) { 126 jlong bits = get_bits(); 127 jlong mask = bit_for(event_type); 128 if (enabled) { 129 bits |= mask; 130 } else { 131 bits &= ~mask; 132 } 133 set_bits(bits); 134 } 135 136 137 /////////////////////////////////////////////////////////////// 138 // 139 // JvmtiEnvThreadEventEnable 140 // 141 142 JvmtiEnvThreadEventEnable::JvmtiEnvThreadEventEnable() { 143 _event_user_enabled.clear(); 144 _event_enabled.clear(); 145 } 146 147 148 JvmtiEnvThreadEventEnable::~JvmtiEnvThreadEventEnable() { 149 _event_user_enabled.clear(); 150 _event_enabled.clear(); 151 } 152 153 154 /////////////////////////////////////////////////////////////// 155 // 156 // JvmtiThreadEventEnable 157 // 158 159 JvmtiThreadEventEnable::JvmtiThreadEventEnable() { 160 _event_enabled.clear(); 161 } 162 163 164 JvmtiThreadEventEnable::~JvmtiThreadEventEnable() { 165 _event_enabled.clear(); 166 } 167 168 169 /////////////////////////////////////////////////////////////// 170 // 171 // JvmtiEnvEventEnable 172 // 173 174 JvmtiEnvEventEnable::JvmtiEnvEventEnable() { 175 _event_user_enabled.clear(); 176 _event_callback_enabled.clear(); 177 _event_enabled.clear(); 178 } 179 180 181 JvmtiEnvEventEnable::~JvmtiEnvEventEnable() { 182 _event_user_enabled.clear(); 183 _event_callback_enabled.clear(); 184 _event_enabled.clear(); 185 } 186 187 188 /////////////////////////////////////////////////////////////// 189 // 190 // VM_EnterInterpOnlyMode 191 // 192 193 class VM_EnterInterpOnlyMode : public VM_Operation { 194 private: 195 JvmtiThreadState *_state; 196 197 public: 198 VM_EnterInterpOnlyMode(JvmtiThreadState *state); 199 200 bool allow_nested_vm_operations() const { return true; } 201 VMOp_Type type() const { return VMOp_EnterInterpOnlyMode; } 202 void doit(); 203 204 // to do: this same function is in jvmtiImpl - should be in one place 205 bool can_be_deoptimized(vframe* vf) { 206 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); 207 } 208 }; 209 210 VM_EnterInterpOnlyMode::VM_EnterInterpOnlyMode(JvmtiThreadState *state) 211 : _state(state) 212 { 213 } 214 215 216 void VM_EnterInterpOnlyMode::doit() { 217 // Set up the current stack depth for later tracking 218 _state->invalidate_cur_stack_depth(); 219 220 _state->enter_interp_only_mode(); 221 222 JavaThread *thread = _state->get_thread(); 223 if (thread->has_last_Java_frame()) { 224 // If running in fullspeed mode, single stepping is implemented 225 // as follows: first, the interpreter does not dispatch to 226 // compiled code for threads that have single stepping enabled; 227 // second, we deoptimize all methods on the thread's stack when 228 // interpreted-only mode is enabled the first time for a given 229 // thread (nothing to do if no Java frames yet). 230 int num_marked = 0; 231 ResourceMark resMark; 232 RegisterMap rm(thread, false); 233 for (vframe* vf = thread->last_java_vframe(&rm); vf; vf = vf->sender()) { 234 if (can_be_deoptimized(vf)) { 235 ((compiledVFrame*) vf)->code()->mark_for_deoptimization(); 236 ++num_marked; 237 } 238 } 239 if (num_marked > 0) { 240 VM_Deoptimize op; 241 VMThread::execute(&op); 242 } 243 } 244 } 245 246 247 /////////////////////////////////////////////////////////////// 248 // 249 // VM_ChangeSingleStep 250 // 251 252 class VM_ChangeSingleStep : public VM_Operation { 253 private: 254 bool _on; 255 256 public: 257 VM_ChangeSingleStep(bool on); 258 VMOp_Type type() const { return VMOp_ChangeSingleStep; } 259 bool allow_nested_vm_operations() const { return true; } 260 void doit(); // method definition is after definition of JvmtiEventControllerPrivate because of scoping 261 }; 262 263 264 VM_ChangeSingleStep::VM_ChangeSingleStep(bool on) 265 : _on(on != 0) 266 { 267 } 268 269 270 271 272 /////////////////////////////////////////////////////////////// 273 // 274 // JvmtiEventControllerPrivate 275 // 276 // Private internal implementation methods for JvmtiEventController. 277 // 278 // These methods are thread safe either because they are called 279 // in early VM initialization which is single threaded, or they 280 // hold the JvmtiThreadState_lock. 281 // 282 283 class JvmtiEventControllerPrivate : public AllStatic { 284 static bool _initialized; 285 public: 286 static void set_should_post_single_step(bool on); 287 static void enter_interp_only_mode(JvmtiThreadState *state); 288 static void leave_interp_only_mode(JvmtiThreadState *state); 289 static void recompute_enabled(); 290 static jlong recompute_env_enabled(JvmtiEnvBase* env); 291 static jlong recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state); 292 static jlong recompute_thread_enabled(JvmtiThreadState *state); 293 static void event_init(); 294 295 static void set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, 296 jvmtiEvent event_type, bool enabled); 297 static void set_event_callbacks(JvmtiEnvBase *env, 298 const jvmtiEventCallbacks* callbacks, 299 jint size_of_callbacks); 300 301 static void set_extension_event_callback(JvmtiEnvBase *env, 302 jint extension_event_index, 303 jvmtiExtensionEvent callback); 304 305 static void set_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop); 306 static void clear_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop); 307 static void clear_to_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop); 308 static void change_field_watch(jvmtiEvent event_type, bool added); 309 310 static void thread_started(JavaThread *thread); 311 static void thread_ended(JavaThread *thread); 312 313 static void env_initialize(JvmtiEnvBase *env); 314 static void env_dispose(JvmtiEnvBase *env); 315 316 static void vm_start(); 317 static void vm_init(); 318 static void vm_death(); 319 320 static void trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed); 321 static void trace_changed(jlong now_enabled, jlong changed); 322 }; 323 324 bool JvmtiEventControllerPrivate::_initialized = false; 325 326 void JvmtiEventControllerPrivate::set_should_post_single_step(bool on) { 327 // we have permission to do this, VM op doesn't 328 JvmtiExport::set_should_post_single_step(on); 329 } 330 331 332 // This change must always be occur when at a safepoint. 333 // Being at a safepoint causes the interpreter to use the 334 // safepoint dispatch table which we overload to find single 335 // step points. Just to be sure that it has been set, we 336 // call notice_safepoints when turning on single stepping. 337 // When we leave our current safepoint, should_post_single_step 338 // will be checked by the interpreter, and the table kept 339 // or changed accordingly. 340 void VM_ChangeSingleStep::doit() { 341 JvmtiEventControllerPrivate::set_should_post_single_step(_on); 342 if (_on) { 343 Interpreter::notice_safepoints(); 344 } 345 } 346 347 348 void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) { 349 EC_TRACE(("[%s] # Entering interpreter only mode", 350 JvmtiTrace::safe_get_thread_name(state->get_thread()))); 351 352 VM_EnterInterpOnlyMode op(state); 353 VMThread::execute(&op); 354 } 355 356 357 void 358 JvmtiEventControllerPrivate::leave_interp_only_mode(JvmtiThreadState *state) { 359 EC_TRACE(("[%s] # Leaving interpreter only mode", 360 JvmtiTrace::safe_get_thread_name(state->get_thread()))); 361 state->leave_interp_only_mode(); 362 } 363 364 365 void 366 JvmtiEventControllerPrivate::trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed) { 367 #ifdef JVMTI_TRACE 368 if (JvmtiTrace::trace_event_controller()) { 369 SafeResourceMark rm; 370 // traces standard events only 371 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 372 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); 373 if (changed & bit) { 374 // it changed, print it 375 log_trace(jvmti)("[%s] # %s event %s", 376 JvmtiTrace::safe_get_thread_name(state->get_thread()), 377 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei)); 378 } 379 } 380 } 381 #endif /*JVMTI_TRACE */ 382 } 383 384 385 void 386 JvmtiEventControllerPrivate::trace_changed(jlong now_enabled, jlong changed) { 387 #ifdef JVMTI_TRACE 388 if (JvmtiTrace::trace_event_controller()) { 389 SafeResourceMark rm; 390 // traces standard events only 391 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 392 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); 393 if (changed & bit) { 394 // it changed, print it 395 log_trace(jvmti)("[-] # %s event %s", 396 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei)); 397 } 398 } 399 } 400 #endif /*JVMTI_TRACE */ 401 } 402 403 404 // For the specified env: compute the currently truly enabled events 405 // set external state accordingly. 406 // Return value and set value must include all events. 407 // But outside this class, only non-thread-filtered events can be queried.. 408 jlong 409 JvmtiEventControllerPrivate::recompute_env_enabled(JvmtiEnvBase* env) { 410 jlong was_enabled = env->env_event_enable()->_event_enabled.get_bits(); 411 jlong now_enabled = 412 env->env_event_enable()->_event_callback_enabled.get_bits() & 413 env->env_event_enable()->_event_user_enabled.get_bits(); 414 415 switch (env->phase()) { 416 case JVMTI_PHASE_PRIMORDIAL: 417 case JVMTI_PHASE_ONLOAD: 418 // only these events allowed in primordial or onload phase 419 now_enabled &= (EARLY_EVENT_BITS & ~THREAD_FILTERED_EVENT_BITS); 420 break; 421 case JVMTI_PHASE_START: 422 // only these events allowed in start phase 423 now_enabled &= EARLY_EVENT_BITS; 424 break; 425 case JVMTI_PHASE_LIVE: 426 // all events allowed during live phase 427 break; 428 case JVMTI_PHASE_DEAD: 429 // no events allowed when dead 430 now_enabled = 0; 431 break; 432 default: 433 assert(false, "no other phases - sanity check"); 434 break; 435 } 436 437 // will we really send these events to this env 438 env->env_event_enable()->_event_enabled.set_bits(now_enabled); 439 440 trace_changed(now_enabled, (now_enabled ^ was_enabled) & ~THREAD_FILTERED_EVENT_BITS); 441 442 return now_enabled; 443 } 444 445 446 // For the specified env and thread: compute the currently truly enabled events 447 // set external state accordingly. Only thread-filtered events are included. 448 jlong 449 JvmtiEventControllerPrivate::recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state) { 450 JvmtiEnv *env = ets->get_env(); 451 452 jlong was_enabled = ets->event_enable()->_event_enabled.get_bits(); 453 jlong now_enabled = THREAD_FILTERED_EVENT_BITS & 454 env->env_event_enable()->_event_callback_enabled.get_bits() & 455 (env->env_event_enable()->_event_user_enabled.get_bits() | 456 ets->event_enable()->_event_user_enabled.get_bits()); 457 458 // for frame pops and field watchs, computed enabled state 459 // is only true if an event has been requested 460 if (!ets->has_frame_pops()) { 461 now_enabled &= ~FRAME_POP_BIT; 462 } 463 if (*((int *)JvmtiExport::get_field_access_count_addr()) == 0) { 464 now_enabled &= ~FIELD_ACCESS_BIT; 465 } 466 if (*((int *)JvmtiExport::get_field_modification_count_addr()) == 0) { 467 now_enabled &= ~FIELD_MODIFICATION_BIT; 468 } 469 470 switch (JvmtiEnv::get_phase()) { 471 case JVMTI_PHASE_DEAD: 472 // no events allowed when dead 473 now_enabled = 0; 474 break; 475 default: 476 break; 477 } 478 479 // if anything changed do update 480 if (now_enabled != was_enabled) { 481 482 // will we really send these events to this thread x env 483 ets->event_enable()->_event_enabled.set_bits(now_enabled); 484 485 // If the enabled status of the single step or breakpoint events changed, 486 // the location status may need to change as well. 487 jlong changed = now_enabled ^ was_enabled; 488 if (changed & SINGLE_STEP_BIT) { 489 ets->reset_current_location(JVMTI_EVENT_SINGLE_STEP, (now_enabled & SINGLE_STEP_BIT) != 0); 490 } 491 if (changed & BREAKPOINT_BIT) { 492 ets->reset_current_location(JVMTI_EVENT_BREAKPOINT, (now_enabled & BREAKPOINT_BIT) != 0); 493 } 494 trace_changed(state, now_enabled, changed); 495 } 496 return now_enabled; 497 } 498 499 500 // For the specified thread: compute the currently truly enabled events 501 // set external state accordingly. Only thread-filtered events are included. 502 jlong 503 JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) { 504 if (state == NULL) { 505 // associated JavaThread is exiting 506 return (jlong)0; 507 } 508 509 julong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits(); 510 julong any_env_enabled = 0; 511 512 { 513 // This iteration will include JvmtiEnvThreadStates whoses environments 514 // have been disposed. These JvmtiEnvThreadStates must not be filtered 515 // as recompute must be called on them to disable their events, 516 JvmtiEnvThreadStateIterator it(state); 517 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 518 any_env_enabled |= recompute_env_thread_enabled(ets, state); 519 } 520 } 521 522 if (any_env_enabled != was_any_env_enabled) { 523 // mark if event is truly enabled on this thread in any environment 524 state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled); 525 526 // compute interp_only mode 527 bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0; 528 bool is_now_interp = state->is_interp_only_mode(); 529 530 if (should_be_interp != is_now_interp) { 531 if (should_be_interp) { 532 enter_interp_only_mode(state); 533 } else { 534 leave_interp_only_mode(state); 535 } 536 } 537 538 // update the JavaThread cached value for thread-specific should_post_on_exceptions value 539 bool should_post_on_exceptions = (any_env_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0; 540 state->set_should_post_on_exceptions(should_post_on_exceptions); 541 } 542 543 return any_env_enabled; 544 } 545 546 547 // Compute truly enabled events - meaning if the event can and could be 548 // sent. An event is truly enabled if it is user enabled on the thread 549 // or globally user enabled, but only if there is a callback or event hook 550 // for it and, for field watch and frame pop, one has been set. 551 // Compute if truly enabled, per thread, per environment, per combination 552 // (thread x environment), and overall. These merges are true if any is true. 553 // True per thread if some environment has callback set and the event is globally 554 // enabled or enabled for this thread. 555 // True per environment if the callback is set and the event is globally 556 // enabled in this environment or enabled for any thread in this environment. 557 // True per combination if the environment has the callback set and the 558 // event is globally enabled in this environment or the event is enabled 559 // for this thread and environment. 560 // 561 // All states transitions dependent on these transitions are also handled here. 562 void 563 JvmtiEventControllerPrivate::recompute_enabled() { 564 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 565 566 // event enabled for any thread in any environment 567 julong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits(); 568 julong any_env_thread_enabled = 0; 569 570 EC_TRACE(("[-] # recompute enabled - before " JULONG_FORMAT_X, was_any_env_thread_enabled)); 571 572 // compute non-thread-filters events. 573 // This must be done separately from thread-filtered events, since some 574 // events can occur before any threads exist. 575 JvmtiEnvIterator it; 576 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { 577 any_env_thread_enabled |= recompute_env_enabled(env); 578 } 579 580 // We need to create any missing jvmti_thread_state if there are globally set thread 581 // filtered events and there weren't last time 582 if ( (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 && 583 (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) { 584 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) { 585 // state_for_while_locked() makes tp->is_exiting() check 586 JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing 587 } 588 } 589 590 // compute and set thread-filtered events 591 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) { 592 any_env_thread_enabled |= recompute_thread_enabled(state); 593 } 594 595 // set universal state (across all envs and threads) 596 jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled; 597 if (delta != 0) { 598 JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0); 599 JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0); 600 JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0); 601 JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0); 602 JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0); 603 JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0); 604 JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0); 605 JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0); 606 JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0); 607 JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0); 608 JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0); 609 JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0); 610 JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0); 611 JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0); 612 JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0); 613 JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0); 614 JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0); 615 JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0); 616 JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0); 617 JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0); 618 619 // need this if we want thread events or we need them to init data 620 JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0); 621 622 // If single stepping is turned on or off, execute the VM op to change it. 623 if (delta & SINGLE_STEP_BIT) { 624 switch (JvmtiEnv::get_phase()) { 625 case JVMTI_PHASE_DEAD: 626 // If the VM is dying we can't execute VM ops 627 break; 628 case JVMTI_PHASE_LIVE: { 629 VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0); 630 VMThread::execute(&op); 631 break; 632 } 633 default: 634 assert(false, "should never come here before live phase"); 635 break; 636 } 637 } 638 639 // set global truly enabled, that is, any thread in any environment 640 JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled); 641 642 // set global should_post_on_exceptions 643 JvmtiExport::set_should_post_on_exceptions((any_env_thread_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0); 644 645 } 646 647 EC_TRACE(("[-] # recompute enabled - after " JULONG_FORMAT_X, any_env_thread_enabled)); 648 } 649 650 651 void 652 JvmtiEventControllerPrivate::thread_started(JavaThread *thread) { 653 assert(thread->is_Java_thread(), "Must be JavaThread"); 654 assert(thread == Thread::current(), "must be current thread"); 655 assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist"); 656 657 EC_TRACE(("[%s] # thread started", JvmtiTrace::safe_get_thread_name(thread))); 658 659 // if we have any thread filtered events globally enabled, create/update the thread state 660 if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) { 661 MutexLocker mu(JvmtiThreadState_lock); 662 // create the thread state if missing 663 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread); 664 if (state != NULL) { // skip threads with no JVMTI thread state 665 recompute_thread_enabled(state); 666 } 667 } 668 } 669 670 671 void 672 JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) { 673 // Removes the JvmtiThreadState associated with the specified thread. 674 // May be called after all environments have been disposed. 675 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); 676 677 EC_TRACE(("[%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread))); 678 679 JvmtiThreadState *state = thread->jvmti_thread_state(); 680 assert(state != NULL, "else why are we here?"); 681 delete state; 682 } 683 684 void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env, 685 const jvmtiEventCallbacks* callbacks, 686 jint size_of_callbacks) { 687 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 688 EC_TRACE(("[*] # set event callbacks")); 689 690 env->set_event_callbacks(callbacks, size_of_callbacks); 691 jlong enabled_bits = 0; 692 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 693 jvmtiEvent evt_t = (jvmtiEvent)ei; 694 if (env->has_callback(evt_t)) { 695 enabled_bits |= JvmtiEventEnabled::bit_for(evt_t); 696 } 697 } 698 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits); 699 recompute_enabled(); 700 } 701 702 void 703 JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env, 704 jint extension_event_index, 705 jvmtiExtensionEvent callback) 706 { 707 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 708 EC_TRACE(("[*] # set extension event callback")); 709 710 // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL 711 assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL && 712 extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check"); 713 714 715 // As the bits for both standard (jvmtiEvent) and extension 716 // (jvmtiExtEvents) are stored in the same word we cast here to 717 // jvmtiEvent to set/clear the bit for this extension event. 718 jvmtiEvent event_type = (jvmtiEvent)extension_event_index; 719 720 // Prevent a possible race condition where events are re-enabled by a call to 721 // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate 722 // environment check and before the lock is acquired. 723 // We can safely do the is_valid check now, as JvmtiThreadState_lock is held. 724 bool enabling = (callback != NULL) && (env->is_valid()); 725 env->env_event_enable()->set_user_enabled(event_type, enabling); 726 727 // update the callback 728 jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks(); 729 switch (extension_event_index) { 730 case EXT_EVENT_CLASS_UNLOAD : 731 ext_callbacks->ClassUnload = callback; 732 break; 733 default: 734 ShouldNotReachHere(); 735 } 736 737 // update the callback enable/disable bit 738 jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits(); 739 jlong bit_for = JvmtiEventEnabled::bit_for(event_type); 740 if (enabling) { 741 enabled_bits |= bit_for; 742 } else { 743 enabled_bits &= ~bit_for; 744 } 745 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits); 746 747 recompute_enabled(); 748 } 749 750 751 void 752 JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) { 753 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 754 EC_TRACE(("[*] # env initialize")); 755 756 if (JvmtiEnvBase::is_vm_live()) { 757 // if we didn't initialize event info already (this is a late 758 // launched environment), do it now. 759 event_init(); 760 } 761 762 env->initialize(); 763 764 // add the JvmtiEnvThreadState to each JvmtiThreadState 765 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) { 766 state->add_env(env); 767 assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check"); 768 } 769 JvmtiEventControllerPrivate::recompute_enabled(); 770 } 771 772 773 void 774 JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) { 775 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 776 EC_TRACE(("[*] # env dispose")); 777 778 // Before the environment is marked disposed, disable all events on this 779 // environment (by zapping the callbacks). As a result, the disposed 780 // environment will not call event handlers. 781 set_event_callbacks(env, NULL, 0); 782 for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL; 783 extension_event_index <= EXT_MAX_EVENT_TYPE_VAL; 784 ++extension_event_index) { 785 set_extension_event_callback(env, extension_event_index, NULL); 786 } 787 788 // Let the environment finish disposing itself. 789 env->env_dispose(); 790 } 791 792 793 void 794 JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, 795 jvmtiEvent event_type, bool enabled) { 796 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 797 798 EC_TRACE(("[%s] # user %s event %s", 799 thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread), 800 enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type))); 801 802 if (thread == NULL) { 803 env->env_event_enable()->set_user_enabled(event_type, enabled); 804 } else { 805 // create the thread state (if it didn't exist before) 806 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread); 807 if (state != NULL) { 808 state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled); 809 } 810 } 811 recompute_enabled(); 812 } 813 814 815 void 816 JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 817 EC_TRACE(("[%s] # set frame pop - frame=%d", 818 JvmtiTrace::safe_get_thread_name(ets->get_thread()), 819 fpop.frame_number() )); 820 821 ets->get_frame_pops()->set(fpop); 822 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); 823 } 824 825 826 void 827 JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 828 EC_TRACE(("[%s] # clear frame pop - frame=%d", 829 JvmtiTrace::safe_get_thread_name(ets->get_thread()), 830 fpop.frame_number() )); 831 832 ets->get_frame_pops()->clear(fpop); 833 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); 834 } 835 836 837 void 838 JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 839 int cleared_cnt = ets->get_frame_pops()->clear_to(fpop); 840 841 EC_TRACE(("[%s] # clear to frame pop - frame=%d, count=%d", 842 JvmtiTrace::safe_get_thread_name(ets->get_thread()), 843 fpop.frame_number(), 844 cleared_cnt )); 845 846 if (cleared_cnt > 0) { 847 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); 848 } 849 } 850 851 void 852 JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) { 853 int *count_addr; 854 855 switch (event_type) { 856 case JVMTI_EVENT_FIELD_MODIFICATION: 857 count_addr = (int *)JvmtiExport::get_field_modification_count_addr(); 858 break; 859 case JVMTI_EVENT_FIELD_ACCESS: 860 count_addr = (int *)JvmtiExport::get_field_access_count_addr(); 861 break; 862 default: 863 assert(false, "incorrect event"); 864 return; 865 } 866 867 EC_TRACE(("[-] # change field watch - %s %s count=%d", 868 event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access", 869 added? "add" : "remove", 870 *count_addr)); 871 872 if (added) { 873 (*count_addr)++; 874 if (*count_addr == 1) { 875 recompute_enabled(); 876 } 877 } else { 878 if (*count_addr > 0) { 879 (*count_addr)--; 880 if (*count_addr == 0) { 881 recompute_enabled(); 882 } 883 } else { 884 assert(false, "field watch out of phase"); 885 } 886 } 887 } 888 889 void 890 JvmtiEventControllerPrivate::event_init() { 891 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); 892 893 if (_initialized) { 894 return; 895 } 896 897 EC_TRACE(("[-] # VM live")); 898 899 #ifdef ASSERT 900 // check that our idea and the spec's idea of threaded events match 901 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 902 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); 903 assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei), 904 "thread filtered event list does not match"); 905 } 906 #endif 907 908 _initialized = true; 909 } 910 911 void 912 JvmtiEventControllerPrivate::vm_start() { 913 // some events are now able to be enabled (phase has changed) 914 JvmtiEventControllerPrivate::recompute_enabled(); 915 } 916 917 918 void 919 JvmtiEventControllerPrivate::vm_init() { 920 event_init(); 921 922 // all the events are now able to be enabled (phase has changed) 923 JvmtiEventControllerPrivate::recompute_enabled(); 924 } 925 926 927 void 928 JvmtiEventControllerPrivate::vm_death() { 929 // events are disabled (phase has changed) 930 JvmtiEventControllerPrivate::recompute_enabled(); 931 } 932 933 934 /////////////////////////////////////////////////////////////// 935 // 936 // JvmtiEventController 937 // 938 939 JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled; 940 941 bool 942 JvmtiEventController::is_global_event(jvmtiEvent event_type) { 943 assert(is_valid_event_type(event_type), "invalid event type"); 944 jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL); 945 return((bit_for & GLOBAL_EVENT_BITS)!=0); 946 } 947 948 void 949 JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) { 950 if (Threads::number_of_threads() == 0) { 951 // during early VM start-up locks don't exist, but we are safely single threaded, 952 // call the functionality without holding the JvmtiThreadState_lock. 953 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled); 954 } else { 955 MutexLocker mu(JvmtiThreadState_lock); 956 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled); 957 } 958 } 959 960 961 void 962 JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env, 963 const jvmtiEventCallbacks* callbacks, 964 jint size_of_callbacks) { 965 if (Threads::number_of_threads() == 0) { 966 // during early VM start-up locks don't exist, but we are safely single threaded, 967 // call the functionality without holding the JvmtiThreadState_lock. 968 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks); 969 } else { 970 MutexLocker mu(JvmtiThreadState_lock); 971 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks); 972 } 973 } 974 975 void 976 JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env, 977 jint extension_event_index, 978 jvmtiExtensionEvent callback) { 979 if (Threads::number_of_threads() == 0) { 980 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback); 981 } else { 982 MutexLocker mu(JvmtiThreadState_lock); 983 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback); 984 } 985 } 986 987 988 989 990 void 991 JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 992 MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); 993 JvmtiEventControllerPrivate::set_frame_pop(ets, fpop); 994 } 995 996 997 void 998 JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 999 MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); 1000 JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop); 1001 } 1002 1003 1004 void 1005 JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 1006 MutexLockerEx mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); 1007 JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop); 1008 } 1009 1010 void 1011 JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) { 1012 MutexLocker mu(JvmtiThreadState_lock); 1013 JvmtiEventControllerPrivate::change_field_watch(event_type, added); 1014 } 1015 1016 void 1017 JvmtiEventController::thread_started(JavaThread *thread) { 1018 // operates only on the current thread 1019 // JvmtiThreadState_lock grabbed only if needed. 1020 JvmtiEventControllerPrivate::thread_started(thread); 1021 } 1022 1023 void 1024 JvmtiEventController::thread_ended(JavaThread *thread) { 1025 // operates only on the current thread 1026 // JvmtiThreadState_lock grabbed only if needed. 1027 JvmtiEventControllerPrivate::thread_ended(thread); 1028 } 1029 1030 void 1031 JvmtiEventController::env_initialize(JvmtiEnvBase *env) { 1032 if (Threads::number_of_threads() == 0) { 1033 // during early VM start-up locks don't exist, but we are safely single threaded, 1034 // call the functionality without holding the JvmtiThreadState_lock. 1035 JvmtiEventControllerPrivate::env_initialize(env); 1036 } else { 1037 MutexLocker mu(JvmtiThreadState_lock); 1038 JvmtiEventControllerPrivate::env_initialize(env); 1039 } 1040 } 1041 1042 void 1043 JvmtiEventController::env_dispose(JvmtiEnvBase *env) { 1044 if (Threads::number_of_threads() == 0) { 1045 // during early VM start-up locks don't exist, but we are safely single threaded, 1046 // call the functionality without holding the JvmtiThreadState_lock. 1047 JvmtiEventControllerPrivate::env_dispose(env); 1048 } else { 1049 MutexLocker mu(JvmtiThreadState_lock); 1050 JvmtiEventControllerPrivate::env_dispose(env); 1051 } 1052 } 1053 1054 1055 void 1056 JvmtiEventController::vm_start() { 1057 if (JvmtiEnvBase::environments_might_exist()) { 1058 MutexLocker mu(JvmtiThreadState_lock); 1059 JvmtiEventControllerPrivate::vm_start(); 1060 } 1061 } 1062 1063 void 1064 JvmtiEventController::vm_init() { 1065 if (JvmtiEnvBase::environments_might_exist()) { 1066 MutexLocker mu(JvmtiThreadState_lock); 1067 JvmtiEventControllerPrivate::vm_init(); 1068 } 1069 } 1070 1071 void 1072 JvmtiEventController::vm_death() { 1073 if (JvmtiEnvBase::environments_might_exist()) { 1074 MutexLocker mu(JvmtiThreadState_lock); 1075 JvmtiEventControllerPrivate::vm_death(); 1076 } 1077 }