1 /* 2 * Copyright (c) 2003, 2019, 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/vmOperations.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 static const jlong SAMPLED_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_SAMPLED_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL)); 88 89 // bits for extension events 90 static const jlong CLASS_UNLOAD_BIT = (((jlong)1) << (EXT_EVENT_CLASS_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL)); 91 92 93 static const jlong MONITOR_BITS = MONITOR_CONTENDED_ENTER_BIT | MONITOR_CONTENDED_ENTERED_BIT | 94 MONITOR_WAIT_BIT | MONITOR_WAITED_BIT; 95 static const jlong EXCEPTION_BITS = EXCEPTION_THROW_BIT | EXCEPTION_CATCH_BIT; 96 static const jlong INTERP_EVENT_BITS = SINGLE_STEP_BIT | METHOD_ENTRY_BIT | METHOD_EXIT_BIT | 97 FRAME_POP_BIT | FIELD_ACCESS_BIT | FIELD_MODIFICATION_BIT; 98 static const jlong THREAD_FILTERED_EVENT_BITS = INTERP_EVENT_BITS | EXCEPTION_BITS | MONITOR_BITS | 99 BREAKPOINT_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | THREAD_END_BIT | 100 SAMPLED_OBJECT_ALLOC_BIT; 101 static const jlong NEED_THREAD_LIFE_EVENTS = THREAD_FILTERED_EVENT_BITS | THREAD_START_BIT; 102 static const jlong EARLY_EVENT_BITS = CLASS_FILE_LOAD_HOOK_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | 103 VM_START_BIT | VM_INIT_BIT | VM_DEATH_BIT | NATIVE_METHOD_BIND_BIT | 104 THREAD_START_BIT | THREAD_END_BIT | 105 COMPILED_METHOD_LOAD_BIT | COMPILED_METHOD_UNLOAD_BIT | 106 DYNAMIC_CODE_GENERATED_BIT; 107 static const jlong GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS; 108 static const jlong SHOULD_POST_ON_EXCEPTIONS_BITS = EXCEPTION_BITS | METHOD_EXIT_BIT | FRAME_POP_BIT; 109 110 /////////////////////////////////////////////////////////////// 111 // 112 // JvmtiEventEnabled 113 // 114 115 JvmtiEventEnabled::JvmtiEventEnabled() { 116 clear(); 117 } 118 119 120 void JvmtiEventEnabled::clear() { 121 _enabled_bits = 0; 122 #ifndef PRODUCT 123 _init_guard = JEE_INIT_GUARD; 124 #endif 125 } 126 127 void JvmtiEventEnabled::set_enabled(jvmtiEvent event_type, bool enabled) { 128 jlong bits = get_bits(); 129 jlong mask = bit_for(event_type); 130 if (enabled) { 131 bits |= mask; 132 } else { 133 bits &= ~mask; 134 } 135 set_bits(bits); 136 } 137 138 139 /////////////////////////////////////////////////////////////// 140 // 141 // JvmtiEnvThreadEventEnable 142 // 143 144 JvmtiEnvThreadEventEnable::JvmtiEnvThreadEventEnable() { 145 _event_user_enabled.clear(); 146 _event_enabled.clear(); 147 } 148 149 150 JvmtiEnvThreadEventEnable::~JvmtiEnvThreadEventEnable() { 151 _event_user_enabled.clear(); 152 _event_enabled.clear(); 153 } 154 155 156 /////////////////////////////////////////////////////////////// 157 // 158 // JvmtiThreadEventEnable 159 // 160 161 JvmtiThreadEventEnable::JvmtiThreadEventEnable() { 162 _event_enabled.clear(); 163 } 164 165 166 JvmtiThreadEventEnable::~JvmtiThreadEventEnable() { 167 _event_enabled.clear(); 168 } 169 170 171 /////////////////////////////////////////////////////////////// 172 // 173 // JvmtiEnvEventEnable 174 // 175 176 JvmtiEnvEventEnable::JvmtiEnvEventEnable() { 177 _event_user_enabled.clear(); 178 _event_callback_enabled.clear(); 179 _event_enabled.clear(); 180 } 181 182 183 JvmtiEnvEventEnable::~JvmtiEnvEventEnable() { 184 _event_user_enabled.clear(); 185 _event_callback_enabled.clear(); 186 _event_enabled.clear(); 187 } 188 189 190 /////////////////////////////////////////////////////////////// 191 // 192 // VM_EnterInterpOnlyMode 193 // 194 195 class VM_EnterInterpOnlyMode : public VM_Operation { 196 private: 197 JvmtiThreadState *_state; 198 199 public: 200 VM_EnterInterpOnlyMode(JvmtiThreadState *state); 201 202 bool allow_nested_vm_operations() const { return true; } 203 VMOp_Type type() const { return VMOp_EnterInterpOnlyMode; } 204 void doit(); 205 206 // to do: this same function is in jvmtiImpl - should be in one place 207 bool can_be_deoptimized(vframe* vf) { 208 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); 209 } 210 }; 211 212 VM_EnterInterpOnlyMode::VM_EnterInterpOnlyMode(JvmtiThreadState *state) 213 : _state(state) 214 { 215 } 216 217 218 void VM_EnterInterpOnlyMode::doit() { 219 // Set up the current stack depth for later tracking 220 _state->invalidate_cur_stack_depth(); 221 222 _state->enter_interp_only_mode(); 223 224 JavaThread *thread = _state->get_thread(); 225 if (thread->has_last_Java_frame()) { 226 // If running in fullspeed mode, single stepping is implemented 227 // as follows: first, the interpreter does not dispatch to 228 // compiled code for threads that have single stepping enabled; 229 // second, we deoptimize all methods on the thread's stack when 230 // interpreted-only mode is enabled the first time for a given 231 // thread (nothing to do if no Java frames yet). 232 int num_marked = 0; 233 ResourceMark resMark; 234 RegisterMap rm(thread, false); 235 for (vframe* vf = thread->last_java_vframe(&rm); vf; vf = vf->sender()) { 236 if (can_be_deoptimized(vf)) { 237 ((compiledVFrame*) vf)->code()->mark_for_deoptimization(); 238 ++num_marked; 239 } 240 } 241 if (num_marked > 0) { 242 VM_Deoptimize op; 243 VMThread::execute(&op); 244 } 245 } 246 } 247 248 249 /////////////////////////////////////////////////////////////// 250 // 251 // VM_ChangeSingleStep 252 // 253 254 class VM_ChangeSingleStep : public VM_Operation { 255 private: 256 bool _on; 257 258 public: 259 VM_ChangeSingleStep(bool on); 260 VMOp_Type type() const { return VMOp_ChangeSingleStep; } 261 bool allow_nested_vm_operations() const { return true; } 262 void doit(); // method definition is after definition of JvmtiEventControllerPrivate because of scoping 263 }; 264 265 266 VM_ChangeSingleStep::VM_ChangeSingleStep(bool on) 267 : _on(on != 0) 268 { 269 } 270 271 272 273 274 /////////////////////////////////////////////////////////////// 275 // 276 // JvmtiEventControllerPrivate 277 // 278 // Private internal implementation methods for JvmtiEventController. 279 // 280 // These methods are thread safe either because they are called 281 // in early VM initialization which is single threaded, or they 282 // hold the JvmtiThreadState_lock. 283 // 284 285 class JvmtiEventControllerPrivate : public AllStatic { 286 static bool _initialized; 287 public: 288 static void set_should_post_single_step(bool on); 289 static void enter_interp_only_mode(JvmtiThreadState *state); 290 static void leave_interp_only_mode(JvmtiThreadState *state); 291 static void recompute_enabled(); 292 static jlong recompute_env_enabled(JvmtiEnvBase* env); 293 static jlong recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state); 294 static jlong recompute_thread_enabled(JvmtiThreadState *state); 295 static void event_init(); 296 297 static void set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, 298 jvmtiEvent event_type, bool enabled); 299 static void set_event_callbacks(JvmtiEnvBase *env, 300 const jvmtiEventCallbacks* callbacks, 301 jint size_of_callbacks); 302 303 static void set_extension_event_callback(JvmtiEnvBase *env, 304 jint extension_event_index, 305 jvmtiExtensionEvent callback); 306 307 static void set_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop); 308 static void clear_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop); 309 static void clear_to_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop); 310 static void change_field_watch(jvmtiEvent event_type, bool added); 311 312 static void thread_started(JavaThread *thread); 313 static void thread_ended(JavaThread *thread); 314 315 static void env_initialize(JvmtiEnvBase *env); 316 static void env_dispose(JvmtiEnvBase *env); 317 318 static void vm_start(); 319 static void vm_init(); 320 static void vm_death(); 321 322 static void trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed); 323 static void trace_changed(jlong now_enabled, jlong changed); 324 }; 325 326 bool JvmtiEventControllerPrivate::_initialized = false; 327 328 void JvmtiEventControllerPrivate::set_should_post_single_step(bool on) { 329 // we have permission to do this, VM op doesn't 330 JvmtiExport::set_should_post_single_step(on); 331 } 332 333 334 // This change must always be occur when at a safepoint. 335 // Being at a safepoint causes the interpreter to use the 336 // safepoint dispatch table which we overload to find single 337 // step points. Just to be sure that it has been set, we 338 // call notice_safepoints when turning on single stepping. 339 // When we leave our current safepoint, should_post_single_step 340 // will be checked by the interpreter, and the table kept 341 // or changed accordingly. 342 void VM_ChangeSingleStep::doit() { 343 JvmtiEventControllerPrivate::set_should_post_single_step(_on); 344 if (_on) { 345 Interpreter::notice_safepoints(); 346 } 347 } 348 349 350 void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) { 351 EC_TRACE(("[%s] # Entering interpreter only mode", 352 JvmtiTrace::safe_get_thread_name(state->get_thread()))); 353 354 VM_EnterInterpOnlyMode op(state); 355 VMThread::execute(&op); 356 } 357 358 359 void 360 JvmtiEventControllerPrivate::leave_interp_only_mode(JvmtiThreadState *state) { 361 EC_TRACE(("[%s] # Leaving interpreter only mode", 362 JvmtiTrace::safe_get_thread_name(state->get_thread()))); 363 state->leave_interp_only_mode(); 364 } 365 366 367 void 368 JvmtiEventControllerPrivate::trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed) { 369 #ifdef JVMTI_TRACE 370 if (JvmtiTrace::trace_event_controller()) { 371 SafeResourceMark rm; 372 // traces standard events only 373 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 374 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); 375 if (changed & bit) { 376 // it changed, print it 377 log_trace(jvmti)("[%s] # %s event %s", 378 JvmtiTrace::safe_get_thread_name(state->get_thread()), 379 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei)); 380 } 381 } 382 } 383 #endif /*JVMTI_TRACE */ 384 } 385 386 387 void 388 JvmtiEventControllerPrivate::trace_changed(jlong now_enabled, jlong changed) { 389 #ifdef JVMTI_TRACE 390 if (JvmtiTrace::trace_event_controller()) { 391 SafeResourceMark rm; 392 // traces standard events only 393 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 394 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); 395 if (changed & bit) { 396 // it changed, print it 397 log_trace(jvmti)("[-] # %s event %s", 398 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei)); 399 } 400 } 401 } 402 #endif /*JVMTI_TRACE */ 403 } 404 405 406 // For the specified env: compute the currently truly enabled events 407 // set external state accordingly. 408 // Return value and set value must include all events. 409 // But outside this class, only non-thread-filtered events can be queried.. 410 jlong 411 JvmtiEventControllerPrivate::recompute_env_enabled(JvmtiEnvBase* env) { 412 jlong was_enabled = env->env_event_enable()->_event_enabled.get_bits(); 413 jlong now_enabled = 414 env->env_event_enable()->_event_callback_enabled.get_bits() & 415 env->env_event_enable()->_event_user_enabled.get_bits(); 416 417 switch (env->phase()) { 418 case JVMTI_PHASE_PRIMORDIAL: 419 case JVMTI_PHASE_ONLOAD: 420 // only these events allowed in primordial or onload phase 421 now_enabled &= (EARLY_EVENT_BITS & ~THREAD_FILTERED_EVENT_BITS); 422 break; 423 case JVMTI_PHASE_START: 424 // only these events allowed in start phase 425 now_enabled &= EARLY_EVENT_BITS; 426 break; 427 case JVMTI_PHASE_LIVE: 428 // all events allowed during live phase 429 break; 430 case JVMTI_PHASE_DEAD: 431 // no events allowed when dead 432 now_enabled = 0; 433 break; 434 default: 435 assert(false, "no other phases - sanity check"); 436 break; 437 } 438 439 // will we really send these events to this env 440 env->env_event_enable()->_event_enabled.set_bits(now_enabled); 441 442 trace_changed(now_enabled, (now_enabled ^ was_enabled) & ~THREAD_FILTERED_EVENT_BITS); 443 444 return now_enabled; 445 } 446 447 448 // For the specified env and thread: compute the currently truly enabled events 449 // set external state accordingly. Only thread-filtered events are included. 450 jlong 451 JvmtiEventControllerPrivate::recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state) { 452 JvmtiEnv *env = ets->get_env(); 453 454 jlong was_enabled = ets->event_enable()->_event_enabled.get_bits(); 455 jlong now_enabled = THREAD_FILTERED_EVENT_BITS & 456 env->env_event_enable()->_event_callback_enabled.get_bits() & 457 (env->env_event_enable()->_event_user_enabled.get_bits() | 458 ets->event_enable()->_event_user_enabled.get_bits()); 459 460 // for frame pops and field watchs, computed enabled state 461 // is only true if an event has been requested 462 if (!ets->has_frame_pops()) { 463 now_enabled &= ~FRAME_POP_BIT; 464 } 465 if (*((int *)JvmtiExport::get_field_access_count_addr()) == 0) { 466 now_enabled &= ~FIELD_ACCESS_BIT; 467 } 468 if (*((int *)JvmtiExport::get_field_modification_count_addr()) == 0) { 469 now_enabled &= ~FIELD_MODIFICATION_BIT; 470 } 471 472 switch (JvmtiEnv::get_phase()) { 473 case JVMTI_PHASE_DEAD: 474 // no events allowed when dead 475 now_enabled = 0; 476 break; 477 default: 478 break; 479 } 480 481 // if anything changed do update 482 if (now_enabled != was_enabled) { 483 484 // will we really send these events to this thread x env 485 ets->event_enable()->_event_enabled.set_bits(now_enabled); 486 487 // If the enabled status of the single step or breakpoint events changed, 488 // the location status may need to change as well. 489 jlong changed = now_enabled ^ was_enabled; 490 if (changed & SINGLE_STEP_BIT) { 491 ets->reset_current_location(JVMTI_EVENT_SINGLE_STEP, (now_enabled & SINGLE_STEP_BIT) != 0); 492 } 493 if (changed & BREAKPOINT_BIT) { 494 ets->reset_current_location(JVMTI_EVENT_BREAKPOINT, (now_enabled & BREAKPOINT_BIT) != 0); 495 } 496 trace_changed(state, now_enabled, changed); 497 } 498 return now_enabled; 499 } 500 501 502 // For the specified thread: compute the currently truly enabled events 503 // set external state accordingly. Only thread-filtered events are included. 504 jlong 505 JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) { 506 if (state == NULL) { 507 // associated JavaThread is exiting 508 return (jlong)0; 509 } 510 511 julong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits(); 512 julong any_env_enabled = 0; 513 // JVMTI_EVENT_FRAME_POP can be disabled (in the case FRAME_POP_BIT is not set), 514 // but we need to set interp_only if some JvmtiEnvThreadState has frame pop set 515 // to clear the request 516 bool has_frame_pops = false; 517 518 { 519 // This iteration will include JvmtiEnvThreadStates whose environments 520 // have been disposed. These JvmtiEnvThreadStates must not be filtered 521 // as recompute must be called on them to disable their events, 522 JvmtiEnvThreadStateIterator it(state); 523 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 524 any_env_enabled |= recompute_env_thread_enabled(ets, state); 525 has_frame_pops |= ets->has_frame_pops(); 526 } 527 } 528 529 if (any_env_enabled != was_any_env_enabled) { 530 // mark if event is truly enabled on this thread in any environment 531 state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled); 532 533 // update the JavaThread cached value for thread-specific should_post_on_exceptions value 534 bool should_post_on_exceptions = (any_env_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0; 535 state->set_should_post_on_exceptions(should_post_on_exceptions); 536 } 537 538 // compute interp_only mode 539 bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0 || has_frame_pops; 540 bool is_now_interp = state->is_interp_only_mode(); 541 542 if (should_be_interp != is_now_interp) { 543 if (should_be_interp) { 544 enter_interp_only_mode(state); 545 } else { 546 leave_interp_only_mode(state); 547 } 548 } 549 550 return any_env_enabled; 551 } 552 553 554 // Compute truly enabled events - meaning if the event can and could be 555 // sent. An event is truly enabled if it is user enabled on the thread 556 // or globally user enabled, but only if there is a callback or event hook 557 // for it and, for field watch and frame pop, one has been set. 558 // Compute if truly enabled, per thread, per environment, per combination 559 // (thread x environment), and overall. These merges are true if any is true. 560 // True per thread if some environment has callback set and the event is globally 561 // enabled or enabled for this thread. 562 // True per environment if the callback is set and the event is globally 563 // enabled in this environment or enabled for any thread in this environment. 564 // True per combination if the environment has the callback set and the 565 // event is globally enabled in this environment or the event is enabled 566 // for this thread and environment. 567 // 568 // All states transitions dependent on these transitions are also handled here. 569 void 570 JvmtiEventControllerPrivate::recompute_enabled() { 571 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 572 573 // event enabled for any thread in any environment 574 julong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits(); 575 julong any_env_thread_enabled = 0; 576 577 EC_TRACE(("[-] # recompute enabled - before " JULONG_FORMAT_X, was_any_env_thread_enabled)); 578 579 // compute non-thread-filters events. 580 // This must be done separately from thread-filtered events, since some 581 // events can occur before any threads exist. 582 JvmtiEnvIterator it; 583 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { 584 any_env_thread_enabled |= recompute_env_enabled(env); 585 } 586 587 // We need to create any missing jvmti_thread_state if there are globally set thread 588 // filtered events and there weren't last time 589 if ( (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 && 590 (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) { 591 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) { 592 // state_for_while_locked() makes tp->is_exiting() check 593 JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing 594 } 595 } 596 597 // compute and set thread-filtered events 598 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) { 599 any_env_thread_enabled |= recompute_thread_enabled(state); 600 } 601 602 // set universal state (across all envs and threads) 603 jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled; 604 if (delta != 0) { 605 JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0); 606 JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0); 607 JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0); 608 JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0); 609 JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0); 610 JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0); 611 JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0); 612 JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0); 613 JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0); 614 JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0); 615 JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0); 616 JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0); 617 JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0); 618 JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0); 619 JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0); 620 JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0); 621 JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0); 622 JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0); 623 JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0); 624 JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0); 625 JvmtiExport::set_should_post_sampled_object_alloc((any_env_thread_enabled & SAMPLED_OBJECT_ALLOC_BIT) != 0); 626 627 // need this if we want thread events or we need them to init data 628 JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0); 629 630 // If single stepping is turned on or off, execute the VM op to change it. 631 if (delta & SINGLE_STEP_BIT) { 632 switch (JvmtiEnv::get_phase()) { 633 case JVMTI_PHASE_DEAD: 634 // If the VM is dying we can't execute VM ops 635 break; 636 case JVMTI_PHASE_LIVE: { 637 VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0); 638 VMThread::execute(&op); 639 break; 640 } 641 default: 642 assert(false, "should never come here before live phase"); 643 break; 644 } 645 } 646 647 // set global truly enabled, that is, any thread in any environment 648 JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled); 649 650 // set global should_post_on_exceptions 651 JvmtiExport::set_should_post_on_exceptions((any_env_thread_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0); 652 653 } 654 655 EC_TRACE(("[-] # recompute enabled - after " JULONG_FORMAT_X, any_env_thread_enabled)); 656 } 657 658 659 void 660 JvmtiEventControllerPrivate::thread_started(JavaThread *thread) { 661 assert(thread->is_Java_thread(), "Must be JavaThread"); 662 assert(thread == Thread::current(), "must be current thread"); 663 assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist"); 664 665 EC_TRACE(("[%s] # thread started", JvmtiTrace::safe_get_thread_name(thread))); 666 667 // if we have any thread filtered events globally enabled, create/update the thread state 668 if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) { 669 MutexLocker mu(JvmtiThreadState_lock); 670 // create the thread state if missing 671 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread); 672 if (state != NULL) { // skip threads with no JVMTI thread state 673 recompute_thread_enabled(state); 674 } 675 } 676 } 677 678 679 void 680 JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) { 681 // Removes the JvmtiThreadState associated with the specified thread. 682 // May be called after all environments have been disposed. 683 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); 684 685 EC_TRACE(("[%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread))); 686 687 JvmtiThreadState *state = thread->jvmti_thread_state(); 688 assert(state != NULL, "else why are we here?"); 689 delete state; 690 } 691 692 void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env, 693 const jvmtiEventCallbacks* callbacks, 694 jint size_of_callbacks) { 695 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 696 EC_TRACE(("[*] # set event callbacks")); 697 698 env->set_event_callbacks(callbacks, size_of_callbacks); 699 jlong enabled_bits = 0; 700 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 701 jvmtiEvent evt_t = (jvmtiEvent)ei; 702 if (env->has_callback(evt_t)) { 703 enabled_bits |= JvmtiEventEnabled::bit_for(evt_t); 704 } 705 } 706 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits); 707 recompute_enabled(); 708 } 709 710 void 711 JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env, 712 jint extension_event_index, 713 jvmtiExtensionEvent callback) 714 { 715 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 716 EC_TRACE(("[*] # set extension event callback")); 717 718 // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL 719 assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL && 720 extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check"); 721 722 723 // As the bits for both standard (jvmtiEvent) and extension 724 // (jvmtiExtEvents) are stored in the same word we cast here to 725 // jvmtiEvent to set/clear the bit for this extension event. 726 jvmtiEvent event_type = (jvmtiEvent)extension_event_index; 727 728 // Prevent a possible race condition where events are re-enabled by a call to 729 // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate 730 // environment check and before the lock is acquired. 731 // We can safely do the is_valid check now, as JvmtiThreadState_lock is held. 732 bool enabling = (callback != NULL) && (env->is_valid()); 733 env->env_event_enable()->set_user_enabled(event_type, enabling); 734 735 // update the callback 736 jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks(); 737 switch (extension_event_index) { 738 case EXT_EVENT_CLASS_UNLOAD : 739 ext_callbacks->ClassUnload = callback; 740 break; 741 default: 742 ShouldNotReachHere(); 743 } 744 745 // update the callback enable/disable bit 746 jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits(); 747 jlong bit_for = JvmtiEventEnabled::bit_for(event_type); 748 if (enabling) { 749 enabled_bits |= bit_for; 750 } else { 751 enabled_bits &= ~bit_for; 752 } 753 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits); 754 755 recompute_enabled(); 756 } 757 758 759 void 760 JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) { 761 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 762 EC_TRACE(("[*] # env initialize")); 763 764 if (JvmtiEnvBase::is_vm_live()) { 765 // if we didn't initialize event info already (this is a late 766 // launched environment), do it now. 767 event_init(); 768 } 769 770 env->initialize(); 771 772 // add the JvmtiEnvThreadState to each JvmtiThreadState 773 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) { 774 state->add_env(env); 775 assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check"); 776 } 777 JvmtiEventControllerPrivate::recompute_enabled(); 778 } 779 780 781 void 782 JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) { 783 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 784 EC_TRACE(("[*] # env dispose")); 785 786 // Before the environment is marked disposed, disable all events on this 787 // environment (by zapping the callbacks). As a result, the disposed 788 // environment will not call event handlers. 789 set_event_callbacks(env, NULL, 0); 790 for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL; 791 extension_event_index <= EXT_MAX_EVENT_TYPE_VAL; 792 ++extension_event_index) { 793 set_extension_event_callback(env, extension_event_index, NULL); 794 } 795 796 // Let the environment finish disposing itself. 797 env->env_dispose(); 798 } 799 800 801 void 802 JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, 803 jvmtiEvent event_type, bool enabled) { 804 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 805 806 EC_TRACE(("[%s] # user %s event %s", 807 thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread), 808 enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type))); 809 810 if (thread == NULL) { 811 env->env_event_enable()->set_user_enabled(event_type, enabled); 812 } else { 813 // create the thread state (if it didn't exist before) 814 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread); 815 if (state != NULL) { 816 state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled); 817 } 818 } 819 recompute_enabled(); 820 } 821 822 823 void 824 JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 825 EC_TRACE(("[%s] # set frame pop - frame=%d", 826 JvmtiTrace::safe_get_thread_name(ets->get_thread()), 827 fpop.frame_number() )); 828 829 ets->get_frame_pops()->set(fpop); 830 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); 831 } 832 833 834 void 835 JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 836 EC_TRACE(("[%s] # clear frame pop - frame=%d", 837 JvmtiTrace::safe_get_thread_name(ets->get_thread()), 838 fpop.frame_number() )); 839 840 ets->get_frame_pops()->clear(fpop); 841 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); 842 } 843 844 845 void 846 JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 847 int cleared_cnt = ets->get_frame_pops()->clear_to(fpop); 848 849 EC_TRACE(("[%s] # clear to frame pop - frame=%d, count=%d", 850 JvmtiTrace::safe_get_thread_name(ets->get_thread()), 851 fpop.frame_number(), 852 cleared_cnt )); 853 854 if (cleared_cnt > 0) { 855 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); 856 } 857 } 858 859 void 860 JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) { 861 int *count_addr; 862 863 switch (event_type) { 864 case JVMTI_EVENT_FIELD_MODIFICATION: 865 count_addr = (int *)JvmtiExport::get_field_modification_count_addr(); 866 break; 867 case JVMTI_EVENT_FIELD_ACCESS: 868 count_addr = (int *)JvmtiExport::get_field_access_count_addr(); 869 break; 870 default: 871 assert(false, "incorrect event"); 872 return; 873 } 874 875 EC_TRACE(("[-] # change field watch - %s %s count=%d", 876 event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access", 877 added? "add" : "remove", 878 *count_addr)); 879 880 if (added) { 881 (*count_addr)++; 882 if (*count_addr == 1) { 883 recompute_enabled(); 884 } 885 } else { 886 if (*count_addr > 0) { 887 (*count_addr)--; 888 if (*count_addr == 0) { 889 recompute_enabled(); 890 } 891 } else { 892 assert(false, "field watch out of phase"); 893 } 894 } 895 } 896 897 void 898 JvmtiEventControllerPrivate::event_init() { 899 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); 900 901 if (_initialized) { 902 return; 903 } 904 905 EC_TRACE(("[-] # VM live")); 906 907 #ifdef ASSERT 908 // check that our idea and the spec's idea of threaded events match 909 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 910 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); 911 assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei), 912 "thread filtered event list does not match"); 913 } 914 #endif 915 916 _initialized = true; 917 } 918 919 void 920 JvmtiEventControllerPrivate::vm_start() { 921 // some events are now able to be enabled (phase has changed) 922 JvmtiEventControllerPrivate::recompute_enabled(); 923 } 924 925 926 void 927 JvmtiEventControllerPrivate::vm_init() { 928 event_init(); 929 930 // all the events are now able to be enabled (phase has changed) 931 JvmtiEventControllerPrivate::recompute_enabled(); 932 } 933 934 935 void 936 JvmtiEventControllerPrivate::vm_death() { 937 // events are disabled (phase has changed) 938 JvmtiEventControllerPrivate::recompute_enabled(); 939 } 940 941 942 /////////////////////////////////////////////////////////////// 943 // 944 // JvmtiEventController 945 // 946 947 JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled; 948 949 bool 950 JvmtiEventController::is_global_event(jvmtiEvent event_type) { 951 assert(is_valid_event_type(event_type), "invalid event type"); 952 jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL); 953 return((bit_for & GLOBAL_EVENT_BITS)!=0); 954 } 955 956 void 957 JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) { 958 if (Threads::number_of_threads() == 0) { 959 // during early VM start-up locks don't exist, but we are safely single threaded, 960 // call the functionality without holding the JvmtiThreadState_lock. 961 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled); 962 } else { 963 MutexLocker mu(JvmtiThreadState_lock); 964 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled); 965 } 966 } 967 968 969 void 970 JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env, 971 const jvmtiEventCallbacks* callbacks, 972 jint size_of_callbacks) { 973 if (Threads::number_of_threads() == 0) { 974 // during early VM start-up locks don't exist, but we are safely single threaded, 975 // call the functionality without holding the JvmtiThreadState_lock. 976 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks); 977 } else { 978 MutexLocker mu(JvmtiThreadState_lock); 979 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks); 980 } 981 } 982 983 void 984 JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env, 985 jint extension_event_index, 986 jvmtiExtensionEvent callback) { 987 if (Threads::number_of_threads() == 0) { 988 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback); 989 } else { 990 MutexLocker mu(JvmtiThreadState_lock); 991 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback); 992 } 993 } 994 995 996 997 998 void 999 JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 1000 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); 1001 JvmtiEventControllerPrivate::set_frame_pop(ets, fpop); 1002 } 1003 1004 1005 void 1006 JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 1007 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); 1008 JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop); 1009 } 1010 1011 1012 void 1013 JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 1014 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); 1015 JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop); 1016 } 1017 1018 void 1019 JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) { 1020 MutexLocker mu(JvmtiThreadState_lock); 1021 JvmtiEventControllerPrivate::change_field_watch(event_type, added); 1022 } 1023 1024 void 1025 JvmtiEventController::thread_started(JavaThread *thread) { 1026 // operates only on the current thread 1027 // JvmtiThreadState_lock grabbed only if needed. 1028 JvmtiEventControllerPrivate::thread_started(thread); 1029 } 1030 1031 void 1032 JvmtiEventController::thread_ended(JavaThread *thread) { 1033 // operates only on the current thread 1034 // JvmtiThreadState_lock grabbed only if needed. 1035 JvmtiEventControllerPrivate::thread_ended(thread); 1036 } 1037 1038 void 1039 JvmtiEventController::env_initialize(JvmtiEnvBase *env) { 1040 if (Threads::number_of_threads() == 0) { 1041 // during early VM start-up locks don't exist, but we are safely single threaded, 1042 // call the functionality without holding the JvmtiThreadState_lock. 1043 JvmtiEventControllerPrivate::env_initialize(env); 1044 } else { 1045 MutexLocker mu(JvmtiThreadState_lock); 1046 JvmtiEventControllerPrivate::env_initialize(env); 1047 } 1048 } 1049 1050 void 1051 JvmtiEventController::env_dispose(JvmtiEnvBase *env) { 1052 if (Threads::number_of_threads() == 0) { 1053 // during early VM start-up locks don't exist, but we are safely single threaded, 1054 // call the functionality without holding the JvmtiThreadState_lock. 1055 JvmtiEventControllerPrivate::env_dispose(env); 1056 } else { 1057 MutexLocker mu(JvmtiThreadState_lock); 1058 JvmtiEventControllerPrivate::env_dispose(env); 1059 } 1060 } 1061 1062 1063 void 1064 JvmtiEventController::vm_start() { 1065 if (JvmtiEnvBase::environments_might_exist()) { 1066 MutexLocker mu(JvmtiThreadState_lock); 1067 JvmtiEventControllerPrivate::vm_start(); 1068 } 1069 } 1070 1071 void 1072 JvmtiEventController::vm_init() { 1073 if (JvmtiEnvBase::environments_might_exist()) { 1074 MutexLocker mu(JvmtiThreadState_lock); 1075 JvmtiEventControllerPrivate::vm_init(); 1076 } 1077 } 1078 1079 void 1080 JvmtiEventController::vm_death() { 1081 if (JvmtiEnvBase::environments_might_exist()) { 1082 MutexLocker mu(JvmtiThreadState_lock); 1083 JvmtiEventControllerPrivate::vm_death(); 1084 } 1085 }