1 /* 2 * Copyright (c) 2003, 2020, 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/deoptimization.hpp" 36 #include "runtime/frame.inline.hpp" 37 #include "runtime/thread.inline.hpp" 38 #include "runtime/threadSMR.hpp" 39 #include "runtime/vframe.hpp" 40 #include "runtime/vframe_hp.hpp" 41 #include "runtime/vmThread.hpp" 42 #include "runtime/vmOperations.hpp" 43 44 #ifdef JVMTI_TRACE 45 #define EC_TRACE(out) do { \ 46 if (JvmtiTrace::trace_event_controller()) { \ 47 SafeResourceMark rm; \ 48 log_trace(jvmti) out; \ 49 } \ 50 } while (0) 51 #else 52 #define EC_TRACE(out) 53 #endif /*JVMTI_TRACE */ 54 55 // bits for standard events 56 57 static const jlong SINGLE_STEP_BIT = (((jlong)1) << (JVMTI_EVENT_SINGLE_STEP - TOTAL_MIN_EVENT_TYPE_VAL)); 58 static const jlong FRAME_POP_BIT = (((jlong)1) << (JVMTI_EVENT_FRAME_POP - TOTAL_MIN_EVENT_TYPE_VAL)); 59 static const jlong BREAKPOINT_BIT = (((jlong)1) << (JVMTI_EVENT_BREAKPOINT - TOTAL_MIN_EVENT_TYPE_VAL)); 60 static const jlong FIELD_ACCESS_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_ACCESS - TOTAL_MIN_EVENT_TYPE_VAL)); 61 static const jlong FIELD_MODIFICATION_BIT = (((jlong)1) << (JVMTI_EVENT_FIELD_MODIFICATION - TOTAL_MIN_EVENT_TYPE_VAL)); 62 static const jlong METHOD_ENTRY_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_ENTRY - TOTAL_MIN_EVENT_TYPE_VAL)); 63 static const jlong METHOD_EXIT_BIT = (((jlong)1) << (JVMTI_EVENT_METHOD_EXIT - TOTAL_MIN_EVENT_TYPE_VAL)); 64 static const jlong CLASS_FILE_LOAD_HOOK_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_FILE_LOAD_HOOK - TOTAL_MIN_EVENT_TYPE_VAL)); 65 static const jlong NATIVE_METHOD_BIND_BIT = (((jlong)1) << (JVMTI_EVENT_NATIVE_METHOD_BIND - TOTAL_MIN_EVENT_TYPE_VAL)); 66 static const jlong VM_START_BIT = (((jlong)1) << (JVMTI_EVENT_VM_START - TOTAL_MIN_EVENT_TYPE_VAL)); 67 static const jlong VM_INIT_BIT = (((jlong)1) << (JVMTI_EVENT_VM_INIT - TOTAL_MIN_EVENT_TYPE_VAL)); 68 static const jlong VM_DEATH_BIT = (((jlong)1) << (JVMTI_EVENT_VM_DEATH - TOTAL_MIN_EVENT_TYPE_VAL)); 69 static const jlong CLASS_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_LOAD - TOTAL_MIN_EVENT_TYPE_VAL)); 70 static const jlong CLASS_PREPARE_BIT = (((jlong)1) << (JVMTI_EVENT_CLASS_PREPARE - TOTAL_MIN_EVENT_TYPE_VAL)); 71 static const jlong THREAD_START_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_START - TOTAL_MIN_EVENT_TYPE_VAL)); 72 static const jlong THREAD_END_BIT = (((jlong)1) << (JVMTI_EVENT_THREAD_END - TOTAL_MIN_EVENT_TYPE_VAL)); 73 static const jlong EXCEPTION_THROW_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION - TOTAL_MIN_EVENT_TYPE_VAL)); 74 static const jlong EXCEPTION_CATCH_BIT = (((jlong)1) << (JVMTI_EVENT_EXCEPTION_CATCH - TOTAL_MIN_EVENT_TYPE_VAL)); 75 static const jlong MONITOR_CONTENDED_ENTER_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTER - TOTAL_MIN_EVENT_TYPE_VAL)); 76 static const jlong MONITOR_CONTENDED_ENTERED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_CONTENDED_ENTERED - TOTAL_MIN_EVENT_TYPE_VAL)); 77 static const jlong MONITOR_WAIT_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAIT - TOTAL_MIN_EVENT_TYPE_VAL)); 78 static const jlong MONITOR_WAITED_BIT = (((jlong)1) << (JVMTI_EVENT_MONITOR_WAITED - TOTAL_MIN_EVENT_TYPE_VAL)); 79 static const jlong DYNAMIC_CODE_GENERATED_BIT = (((jlong)1) << (JVMTI_EVENT_DYNAMIC_CODE_GENERATED - TOTAL_MIN_EVENT_TYPE_VAL)); 80 static const jlong DATA_DUMP_BIT = (((jlong)1) << (JVMTI_EVENT_DATA_DUMP_REQUEST - TOTAL_MIN_EVENT_TYPE_VAL)); 81 static const jlong COMPILED_METHOD_LOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_LOAD - TOTAL_MIN_EVENT_TYPE_VAL)); 82 static const jlong COMPILED_METHOD_UNLOAD_BIT = (((jlong)1) << (JVMTI_EVENT_COMPILED_METHOD_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL)); 83 static const jlong GARBAGE_COLLECTION_START_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_START - TOTAL_MIN_EVENT_TYPE_VAL)); 84 static const jlong GARBAGE_COLLECTION_FINISH_BIT = (((jlong)1) << (JVMTI_EVENT_GARBAGE_COLLECTION_FINISH - TOTAL_MIN_EVENT_TYPE_VAL)); 85 static const jlong OBJECT_FREE_BIT = (((jlong)1) << (JVMTI_EVENT_OBJECT_FREE - TOTAL_MIN_EVENT_TYPE_VAL)); 86 static const jlong RESOURCE_EXHAUSTED_BIT = (((jlong)1) << (JVMTI_EVENT_RESOURCE_EXHAUSTED - TOTAL_MIN_EVENT_TYPE_VAL)); 87 static const jlong VM_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_VM_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL)); 88 static const jlong SAMPLED_OBJECT_ALLOC_BIT = (((jlong)1) << (JVMTI_EVENT_SAMPLED_OBJECT_ALLOC - TOTAL_MIN_EVENT_TYPE_VAL)); 89 90 // bits for extension events 91 static const jlong CLASS_UNLOAD_BIT = (((jlong)1) << (EXT_EVENT_CLASS_UNLOAD - TOTAL_MIN_EVENT_TYPE_VAL)); 92 93 94 static const jlong MONITOR_BITS = MONITOR_CONTENDED_ENTER_BIT | MONITOR_CONTENDED_ENTERED_BIT | 95 MONITOR_WAIT_BIT | MONITOR_WAITED_BIT; 96 static const jlong EXCEPTION_BITS = EXCEPTION_THROW_BIT | EXCEPTION_CATCH_BIT; 97 static const jlong INTERP_EVENT_BITS = SINGLE_STEP_BIT | METHOD_ENTRY_BIT | METHOD_EXIT_BIT | 98 FRAME_POP_BIT | FIELD_ACCESS_BIT | FIELD_MODIFICATION_BIT; 99 static const jlong THREAD_FILTERED_EVENT_BITS = INTERP_EVENT_BITS | EXCEPTION_BITS | MONITOR_BITS | 100 BREAKPOINT_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | THREAD_END_BIT | 101 SAMPLED_OBJECT_ALLOC_BIT; 102 static const jlong NEED_THREAD_LIFE_EVENTS = THREAD_FILTERED_EVENT_BITS | THREAD_START_BIT; 103 static const jlong EARLY_EVENT_BITS = CLASS_FILE_LOAD_HOOK_BIT | CLASS_LOAD_BIT | CLASS_PREPARE_BIT | 104 VM_START_BIT | VM_INIT_BIT | VM_DEATH_BIT | NATIVE_METHOD_BIND_BIT | 105 THREAD_START_BIT | THREAD_END_BIT | 106 COMPILED_METHOD_LOAD_BIT | COMPILED_METHOD_UNLOAD_BIT | 107 DYNAMIC_CODE_GENERATED_BIT; 108 static const jlong GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS; 109 static const jlong SHOULD_POST_ON_EXCEPTIONS_BITS = EXCEPTION_BITS | METHOD_EXIT_BIT | FRAME_POP_BIT; 110 111 /////////////////////////////////////////////////////////////// 112 // 113 // JvmtiEventEnabled 114 // 115 116 JvmtiEventEnabled::JvmtiEventEnabled() { 117 clear(); 118 } 119 120 121 void JvmtiEventEnabled::clear() { 122 _enabled_bits = 0; 123 #ifndef PRODUCT 124 _init_guard = JEE_INIT_GUARD; 125 #endif 126 } 127 128 void JvmtiEventEnabled::set_enabled(jvmtiEvent event_type, bool enabled) { 129 jlong bits = get_bits(); 130 jlong mask = bit_for(event_type); 131 if (enabled) { 132 bits |= mask; 133 } else { 134 bits &= ~mask; 135 } 136 set_bits(bits); 137 } 138 139 140 /////////////////////////////////////////////////////////////// 141 // 142 // JvmtiEnvThreadEventEnable 143 // 144 145 JvmtiEnvThreadEventEnable::JvmtiEnvThreadEventEnable() { 146 _event_user_enabled.clear(); 147 _event_enabled.clear(); 148 } 149 150 151 JvmtiEnvThreadEventEnable::~JvmtiEnvThreadEventEnable() { 152 _event_user_enabled.clear(); 153 _event_enabled.clear(); 154 } 155 156 157 /////////////////////////////////////////////////////////////// 158 // 159 // JvmtiThreadEventEnable 160 // 161 162 JvmtiThreadEventEnable::JvmtiThreadEventEnable() { 163 _event_enabled.clear(); 164 } 165 166 167 JvmtiThreadEventEnable::~JvmtiThreadEventEnable() { 168 _event_enabled.clear(); 169 } 170 171 172 /////////////////////////////////////////////////////////////// 173 // 174 // JvmtiEnvEventEnable 175 // 176 177 JvmtiEnvEventEnable::JvmtiEnvEventEnable() { 178 _event_user_enabled.clear(); 179 _event_callback_enabled.clear(); 180 _event_enabled.clear(); 181 } 182 183 184 JvmtiEnvEventEnable::~JvmtiEnvEventEnable() { 185 _event_user_enabled.clear(); 186 _event_callback_enabled.clear(); 187 _event_enabled.clear(); 188 } 189 190 191 /////////////////////////////////////////////////////////////// 192 // 193 // EnterInterpOnlyModeClosure 194 // 195 196 class EnterInterpOnlyModeClosure : public HandshakeClosure { 197 198 public: 199 EnterInterpOnlyModeClosure() : HandshakeClosure("EnterInterpOnlyMode") { } 200 void do_thread(Thread* th) { 201 JavaThread* jt = (JavaThread*) th; 202 JvmtiThreadState* state = jt->jvmti_thread_state(); 203 204 // Set up the current stack depth for later tracking 205 state->invalidate_cur_stack_depth(); 206 207 state->enter_interp_only_mode(); 208 209 if (jt->has_last_Java_frame()) { 210 // If running in fullspeed mode, single stepping is implemented 211 // as follows: first, the interpreter does not dispatch to 212 // compiled code for threads that have single stepping enabled; 213 // second, we deoptimize all compiled java frames on the thread's stack when 214 // interpreted-only mode is enabled the first time for a given 215 // thread (nothing to do if no Java frames yet). 216 ResourceMark resMark; 217 for (StackFrameStream fst(jt, false); !fst.is_done(); fst.next()) { 218 if (fst.current()->can_be_deoptimized()) { 219 Deoptimization::deoptimize(jt, *fst.current()); 220 } 221 } 222 } 223 } 224 }; 225 226 227 /////////////////////////////////////////////////////////////// 228 // 229 // VM_ChangeSingleStep 230 // 231 232 class VM_ChangeSingleStep : public VM_Operation { 233 private: 234 bool _on; 235 236 public: 237 VM_ChangeSingleStep(bool on); 238 VMOp_Type type() const { return VMOp_ChangeSingleStep; } 239 bool allow_nested_vm_operations() const { return true; } 240 void doit(); // method definition is after definition of JvmtiEventControllerPrivate because of scoping 241 }; 242 243 244 VM_ChangeSingleStep::VM_ChangeSingleStep(bool on) 245 : _on(on) 246 { 247 } 248 249 250 251 252 /////////////////////////////////////////////////////////////// 253 // 254 // JvmtiEventControllerPrivate 255 // 256 // Private internal implementation methods for JvmtiEventController. 257 // 258 // These methods are thread safe either because they are called 259 // in early VM initialization which is single threaded, or they 260 // hold the JvmtiThreadState_lock. 261 // 262 263 class JvmtiEventControllerPrivate : public AllStatic { 264 static bool _initialized; 265 public: 266 static void set_should_post_single_step(bool on); 267 static void enter_interp_only_mode(JvmtiThreadState *state); 268 static void leave_interp_only_mode(JvmtiThreadState *state); 269 static void recompute_enabled(); 270 static jlong recompute_env_enabled(JvmtiEnvBase* env); 271 static jlong recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state); 272 static jlong recompute_thread_enabled(JvmtiThreadState *state); 273 static void event_init(); 274 275 static void set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, 276 jvmtiEvent event_type, bool enabled); 277 static void set_event_callbacks(JvmtiEnvBase *env, 278 const jvmtiEventCallbacks* callbacks, 279 jint size_of_callbacks); 280 281 static void set_extension_event_callback(JvmtiEnvBase *env, 282 jint extension_event_index, 283 jvmtiExtensionEvent callback); 284 285 static void set_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop); 286 static void clear_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop); 287 static void clear_to_frame_pop(JvmtiEnvThreadState *env_thread, JvmtiFramePop fpop); 288 static void change_field_watch(jvmtiEvent event_type, bool added); 289 290 static void thread_started(JavaThread *thread); 291 static void thread_ended(JavaThread *thread); 292 293 static void env_initialize(JvmtiEnvBase *env); 294 static void env_dispose(JvmtiEnvBase *env); 295 296 static void vm_start(); 297 static void vm_init(); 298 static void vm_death(); 299 300 static void trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed); 301 static void trace_changed(jlong now_enabled, jlong changed); 302 }; 303 304 bool JvmtiEventControllerPrivate::_initialized = false; 305 306 void JvmtiEventControllerPrivate::set_should_post_single_step(bool on) { 307 // we have permission to do this, VM op doesn't 308 JvmtiExport::set_should_post_single_step(on); 309 } 310 311 312 // When _on == true, we use the safepoint interpreter dispatch table 313 // to allow us to find the single step points. Otherwise, we switch 314 // back to the regular interpreter dispatch table. 315 // Note: We call Interpreter::notice_safepoints() and ignore_safepoints() 316 // in a VM_Operation to safely make the dispatch table switch. We 317 // no longer rely on the safepoint mechanism to do any of this work 318 // for us. 319 void VM_ChangeSingleStep::doit() { 320 log_debug(interpreter, safepoint)("changing single step to '%s'", _on ? "on" : "off"); 321 JvmtiEventControllerPrivate::set_should_post_single_step(_on); 322 if (_on) { 323 Interpreter::notice_safepoints(); 324 } else { 325 Interpreter::ignore_safepoints(); 326 } 327 } 328 329 330 void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) { 331 EC_TRACE(("[%s] # Entering interpreter only mode", 332 JvmtiTrace::safe_get_thread_name(state->get_thread()))); 333 EnterInterpOnlyModeClosure hs; 334 if (SafepointSynchronize::is_at_safepoint()) { 335 hs.do_thread(state->get_thread()); 336 } else { 337 Handshake::execute_direct(&hs, state->get_thread()); 338 } 339 } 340 341 342 void 343 JvmtiEventControllerPrivate::leave_interp_only_mode(JvmtiThreadState *state) { 344 EC_TRACE(("[%s] # Leaving interpreter only mode", 345 JvmtiTrace::safe_get_thread_name(state->get_thread()))); 346 state->leave_interp_only_mode(); 347 } 348 349 350 void 351 JvmtiEventControllerPrivate::trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed) { 352 #ifdef JVMTI_TRACE 353 if (JvmtiTrace::trace_event_controller()) { 354 SafeResourceMark rm; 355 // traces standard events only 356 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 357 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); 358 if (changed & bit) { 359 // it changed, print it 360 log_trace(jvmti)("[%s] # %s event %s", 361 JvmtiTrace::safe_get_thread_name(state->get_thread()), 362 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei)); 363 } 364 } 365 } 366 #endif /*JVMTI_TRACE */ 367 } 368 369 370 void 371 JvmtiEventControllerPrivate::trace_changed(jlong now_enabled, jlong changed) { 372 #ifdef JVMTI_TRACE 373 if (JvmtiTrace::trace_event_controller()) { 374 SafeResourceMark rm; 375 // traces standard events only 376 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 377 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); 378 if (changed & bit) { 379 // it changed, print it 380 log_trace(jvmti)("[-] # %s event %s", 381 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei)); 382 } 383 } 384 } 385 #endif /*JVMTI_TRACE */ 386 } 387 388 389 // For the specified env: compute the currently truly enabled events 390 // set external state accordingly. 391 // Return value and set value must include all events. 392 // But outside this class, only non-thread-filtered events can be queried.. 393 jlong 394 JvmtiEventControllerPrivate::recompute_env_enabled(JvmtiEnvBase* env) { 395 jlong was_enabled = env->env_event_enable()->_event_enabled.get_bits(); 396 jlong now_enabled = 397 env->env_event_enable()->_event_callback_enabled.get_bits() & 398 env->env_event_enable()->_event_user_enabled.get_bits(); 399 400 switch (env->phase()) { 401 case JVMTI_PHASE_PRIMORDIAL: 402 case JVMTI_PHASE_ONLOAD: 403 // only these events allowed in primordial or onload phase 404 now_enabled &= (EARLY_EVENT_BITS & ~THREAD_FILTERED_EVENT_BITS); 405 break; 406 case JVMTI_PHASE_START: 407 // only these events allowed in start phase 408 now_enabled &= EARLY_EVENT_BITS; 409 break; 410 case JVMTI_PHASE_LIVE: 411 // all events allowed during live phase 412 break; 413 case JVMTI_PHASE_DEAD: 414 // no events allowed when dead 415 now_enabled = 0; 416 break; 417 default: 418 assert(false, "no other phases - sanity check"); 419 break; 420 } 421 422 // will we really send these events to this env 423 env->env_event_enable()->_event_enabled.set_bits(now_enabled); 424 425 trace_changed(now_enabled, (now_enabled ^ was_enabled) & ~THREAD_FILTERED_EVENT_BITS); 426 427 return now_enabled; 428 } 429 430 431 // For the specified env and thread: compute the currently truly enabled events 432 // set external state accordingly. Only thread-filtered events are included. 433 jlong 434 JvmtiEventControllerPrivate::recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state) { 435 JvmtiEnv *env = ets->get_env(); 436 437 jlong was_enabled = ets->event_enable()->_event_enabled.get_bits(); 438 jlong now_enabled = THREAD_FILTERED_EVENT_BITS & 439 env->env_event_enable()->_event_callback_enabled.get_bits() & 440 (env->env_event_enable()->_event_user_enabled.get_bits() | 441 ets->event_enable()->_event_user_enabled.get_bits()); 442 443 // for frame pops and field watchs, computed enabled state 444 // is only true if an event has been requested 445 if (!ets->has_frame_pops()) { 446 now_enabled &= ~FRAME_POP_BIT; 447 } 448 if (*((int *)JvmtiExport::get_field_access_count_addr()) == 0) { 449 now_enabled &= ~FIELD_ACCESS_BIT; 450 } 451 if (*((int *)JvmtiExport::get_field_modification_count_addr()) == 0) { 452 now_enabled &= ~FIELD_MODIFICATION_BIT; 453 } 454 455 switch (JvmtiEnv::get_phase()) { 456 case JVMTI_PHASE_DEAD: 457 // no events allowed when dead 458 now_enabled = 0; 459 break; 460 default: 461 break; 462 } 463 464 // if anything changed do update 465 if (now_enabled != was_enabled) { 466 467 // will we really send these events to this thread x env 468 ets->event_enable()->_event_enabled.set_bits(now_enabled); 469 470 // If the enabled status of the single step or breakpoint events changed, 471 // the location status may need to change as well. 472 jlong changed = now_enabled ^ was_enabled; 473 if (changed & SINGLE_STEP_BIT) { 474 ets->reset_current_location(JVMTI_EVENT_SINGLE_STEP, (now_enabled & SINGLE_STEP_BIT) != 0); 475 } 476 if (changed & BREAKPOINT_BIT) { 477 ets->reset_current_location(JVMTI_EVENT_BREAKPOINT, (now_enabled & BREAKPOINT_BIT) != 0); 478 } 479 trace_changed(state, now_enabled, changed); 480 } 481 return now_enabled; 482 } 483 484 485 // For the specified thread: compute the currently truly enabled events 486 // set external state accordingly. Only thread-filtered events are included. 487 jlong 488 JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) { 489 if (state == NULL) { 490 // associated JavaThread is exiting 491 return (jlong)0; 492 } 493 494 julong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits(); 495 julong any_env_enabled = 0; 496 // JVMTI_EVENT_FRAME_POP can be disabled (in the case FRAME_POP_BIT is not set), 497 // but we need to set interp_only if some JvmtiEnvThreadState has frame pop set 498 // to clear the request 499 bool has_frame_pops = false; 500 501 { 502 // This iteration will include JvmtiEnvThreadStates whose environments 503 // have been disposed. These JvmtiEnvThreadStates must not be filtered 504 // as recompute must be called on them to disable their events, 505 JvmtiEnvThreadStateIterator it(state); 506 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 507 any_env_enabled |= recompute_env_thread_enabled(ets, state); 508 has_frame_pops |= ets->has_frame_pops(); 509 } 510 } 511 512 if (any_env_enabled != was_any_env_enabled) { 513 // mark if event is truly enabled on this thread in any environment 514 state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled); 515 516 // update the JavaThread cached value for thread-specific should_post_on_exceptions value 517 bool should_post_on_exceptions = (any_env_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0; 518 state->set_should_post_on_exceptions(should_post_on_exceptions); 519 } 520 521 // compute interp_only mode 522 bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0 || has_frame_pops; 523 bool is_now_interp = state->is_interp_only_mode(); 524 525 if (should_be_interp != is_now_interp) { 526 if (should_be_interp) { 527 enter_interp_only_mode(state); 528 } else { 529 leave_interp_only_mode(state); 530 } 531 } 532 533 return any_env_enabled; 534 } 535 536 537 // Compute truly enabled events - meaning if the event can and could be 538 // sent. An event is truly enabled if it is user enabled on the thread 539 // or globally user enabled, but only if there is a callback or event hook 540 // for it and, for field watch and frame pop, one has been set. 541 // Compute if truly enabled, per thread, per environment, per combination 542 // (thread x environment), and overall. These merges are true if any is true. 543 // True per thread if some environment has callback set and the event is globally 544 // enabled or enabled for this thread. 545 // True per environment if the callback is set and the event is globally 546 // enabled in this environment or enabled for any thread in this environment. 547 // True per combination if the environment has the callback set and the 548 // event is globally enabled in this environment or the event is enabled 549 // for this thread and environment. 550 // 551 // All states transitions dependent on these transitions are also handled here. 552 void 553 JvmtiEventControllerPrivate::recompute_enabled() { 554 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 555 556 // event enabled for any thread in any environment 557 julong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits(); 558 julong any_env_thread_enabled = 0; 559 560 EC_TRACE(("[-] # recompute enabled - before " JULONG_FORMAT_X, was_any_env_thread_enabled)); 561 562 // compute non-thread-filters events. 563 // This must be done separately from thread-filtered events, since some 564 // events can occur before any threads exist. 565 JvmtiEnvIterator it; 566 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { 567 any_env_thread_enabled |= recompute_env_enabled(env); 568 } 569 570 // We need to create any missing jvmti_thread_state if there are globally set thread 571 // filtered events and there weren't last time 572 if ( (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 && 573 (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) { 574 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) { 575 // state_for_while_locked() makes tp->is_exiting() check 576 JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing 577 } 578 } 579 580 // compute and set thread-filtered events 581 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) { 582 any_env_thread_enabled |= recompute_thread_enabled(state); 583 } 584 585 // set universal state (across all envs and threads) 586 jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled; 587 if (delta != 0) { 588 JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0); 589 JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0); 590 JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0); 591 JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0); 592 JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0); 593 JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0); 594 JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0); 595 JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0); 596 JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0); 597 JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0); 598 JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0); 599 JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0); 600 JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0); 601 JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0); 602 JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0); 603 JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0); 604 JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0); 605 JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0); 606 JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0); 607 JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0); 608 JvmtiExport::set_should_post_sampled_object_alloc((any_env_thread_enabled & SAMPLED_OBJECT_ALLOC_BIT) != 0); 609 610 // need this if we want thread events or we need them to init data 611 JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0); 612 613 // If single stepping is turned on or off, execute the VM op to change it. 614 if (delta & SINGLE_STEP_BIT) { 615 switch (JvmtiEnv::get_phase()) { 616 case JVMTI_PHASE_DEAD: 617 // If the VM is dying we can't execute VM ops 618 break; 619 case JVMTI_PHASE_LIVE: { 620 VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0); 621 VMThread::execute(&op); 622 break; 623 } 624 default: 625 assert(false, "should never come here before live phase"); 626 break; 627 } 628 } 629 630 // set global truly enabled, that is, any thread in any environment 631 JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled); 632 633 // set global should_post_on_exceptions 634 JvmtiExport::set_should_post_on_exceptions((any_env_thread_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0); 635 636 } 637 638 EC_TRACE(("[-] # recompute enabled - after " JULONG_FORMAT_X, any_env_thread_enabled)); 639 } 640 641 642 void 643 JvmtiEventControllerPrivate::thread_started(JavaThread *thread) { 644 assert(thread->is_Java_thread(), "Must be JavaThread"); 645 assert(thread == Thread::current(), "must be current thread"); 646 assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist"); 647 648 EC_TRACE(("[%s] # thread started", JvmtiTrace::safe_get_thread_name(thread))); 649 650 // if we have any thread filtered events globally enabled, create/update the thread state 651 if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) { 652 MutexLocker mu(JvmtiThreadState_lock); 653 // create the thread state if missing 654 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread); 655 if (state != NULL) { // skip threads with no JVMTI thread state 656 recompute_thread_enabled(state); 657 } 658 } 659 } 660 661 662 void 663 JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) { 664 // Removes the JvmtiThreadState associated with the specified thread. 665 // May be called after all environments have been disposed. 666 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); 667 668 EC_TRACE(("[%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread))); 669 670 JvmtiThreadState *state = thread->jvmti_thread_state(); 671 assert(state != NULL, "else why are we here?"); 672 delete state; 673 } 674 675 void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env, 676 const jvmtiEventCallbacks* callbacks, 677 jint size_of_callbacks) { 678 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 679 EC_TRACE(("[*] # set event callbacks")); 680 681 env->set_event_callbacks(callbacks, size_of_callbacks); 682 jlong enabled_bits = 0; 683 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 684 jvmtiEvent evt_t = (jvmtiEvent)ei; 685 if (env->has_callback(evt_t)) { 686 enabled_bits |= JvmtiEventEnabled::bit_for(evt_t); 687 } 688 } 689 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits); 690 recompute_enabled(); 691 } 692 693 void 694 JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env, 695 jint extension_event_index, 696 jvmtiExtensionEvent callback) 697 { 698 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 699 EC_TRACE(("[*] # set extension event callback")); 700 701 // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL 702 assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL && 703 extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check"); 704 705 706 // As the bits for both standard (jvmtiEvent) and extension 707 // (jvmtiExtEvents) are stored in the same word we cast here to 708 // jvmtiEvent to set/clear the bit for this extension event. 709 jvmtiEvent event_type = (jvmtiEvent)extension_event_index; 710 711 // Prevent a possible race condition where events are re-enabled by a call to 712 // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate 713 // environment check and before the lock is acquired. 714 // We can safely do the is_valid check now, as JvmtiThreadState_lock is held. 715 bool enabling = (callback != NULL) && (env->is_valid()); 716 env->env_event_enable()->set_user_enabled(event_type, enabling); 717 718 // update the callback 719 jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks(); 720 switch (extension_event_index) { 721 case EXT_EVENT_CLASS_UNLOAD : 722 ext_callbacks->ClassUnload = callback; 723 break; 724 default: 725 ShouldNotReachHere(); 726 } 727 728 // update the callback enable/disable bit 729 jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits(); 730 jlong bit_for = JvmtiEventEnabled::bit_for(event_type); 731 if (enabling) { 732 enabled_bits |= bit_for; 733 } else { 734 enabled_bits &= ~bit_for; 735 } 736 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits); 737 738 recompute_enabled(); 739 } 740 741 742 void 743 JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) { 744 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 745 EC_TRACE(("[*] # env initialize")); 746 747 if (JvmtiEnvBase::is_vm_live()) { 748 // if we didn't initialize event info already (this is a late 749 // launched environment), do it now. 750 event_init(); 751 } 752 753 env->initialize(); 754 755 // add the JvmtiEnvThreadState to each JvmtiThreadState 756 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) { 757 state->add_env(env); 758 assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check"); 759 } 760 JvmtiEventControllerPrivate::recompute_enabled(); 761 } 762 763 764 void 765 JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) { 766 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 767 EC_TRACE(("[*] # env dispose")); 768 769 // Before the environment is marked disposed, disable all events on this 770 // environment (by zapping the callbacks). As a result, the disposed 771 // environment will not call event handlers. 772 set_event_callbacks(env, NULL, 0); 773 for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL; 774 extension_event_index <= EXT_MAX_EVENT_TYPE_VAL; 775 ++extension_event_index) { 776 set_extension_event_callback(env, extension_event_index, NULL); 777 } 778 779 // Let the environment finish disposing itself. 780 env->env_dispose(); 781 } 782 783 784 void 785 JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, 786 jvmtiEvent event_type, bool enabled) { 787 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 788 789 EC_TRACE(("[%s] # user %s event %s", 790 thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread), 791 enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type))); 792 793 if (thread == NULL) { 794 env->env_event_enable()->set_user_enabled(event_type, enabled); 795 } else { 796 // create the thread state (if it didn't exist before) 797 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread); 798 if (state != NULL) { 799 state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled); 800 } 801 } 802 recompute_enabled(); 803 } 804 805 806 void 807 JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 808 EC_TRACE(("[%s] # set frame pop - frame=%d", 809 JvmtiTrace::safe_get_thread_name(ets->get_thread()), 810 fpop.frame_number() )); 811 812 ets->get_frame_pops()->set(fpop); 813 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); 814 } 815 816 817 void 818 JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 819 EC_TRACE(("[%s] # clear frame pop - frame=%d", 820 JvmtiTrace::safe_get_thread_name(ets->get_thread()), 821 fpop.frame_number() )); 822 823 ets->get_frame_pops()->clear(fpop); 824 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); 825 } 826 827 828 void 829 JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 830 int cleared_cnt = ets->get_frame_pops()->clear_to(fpop); 831 832 EC_TRACE(("[%s] # clear to frame pop - frame=%d, count=%d", 833 JvmtiTrace::safe_get_thread_name(ets->get_thread()), 834 fpop.frame_number(), 835 cleared_cnt )); 836 837 if (cleared_cnt > 0) { 838 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); 839 } 840 } 841 842 void 843 JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) { 844 int *count_addr; 845 846 switch (event_type) { 847 case JVMTI_EVENT_FIELD_MODIFICATION: 848 count_addr = (int *)JvmtiExport::get_field_modification_count_addr(); 849 break; 850 case JVMTI_EVENT_FIELD_ACCESS: 851 count_addr = (int *)JvmtiExport::get_field_access_count_addr(); 852 break; 853 default: 854 assert(false, "incorrect event"); 855 return; 856 } 857 858 EC_TRACE(("[-] # change field watch - %s %s count=%d", 859 event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access", 860 added? "add" : "remove", 861 *count_addr)); 862 863 if (added) { 864 (*count_addr)++; 865 if (*count_addr == 1) { 866 recompute_enabled(); 867 } 868 } else { 869 if (*count_addr > 0) { 870 (*count_addr)--; 871 if (*count_addr == 0) { 872 recompute_enabled(); 873 } 874 } else { 875 assert(false, "field watch out of phase"); 876 } 877 } 878 } 879 880 void 881 JvmtiEventControllerPrivate::event_init() { 882 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); 883 884 if (_initialized) { 885 return; 886 } 887 888 EC_TRACE(("[-] # VM live")); 889 890 #ifdef ASSERT 891 // check that our idea and the spec's idea of threaded events match 892 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 893 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); 894 assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei), 895 "thread filtered event list does not match"); 896 } 897 #endif 898 899 _initialized = true; 900 } 901 902 void 903 JvmtiEventControllerPrivate::vm_start() { 904 // some events are now able to be enabled (phase has changed) 905 JvmtiEventControllerPrivate::recompute_enabled(); 906 } 907 908 909 void 910 JvmtiEventControllerPrivate::vm_init() { 911 event_init(); 912 913 // all the events are now able to be enabled (phase has changed) 914 JvmtiEventControllerPrivate::recompute_enabled(); 915 } 916 917 918 void 919 JvmtiEventControllerPrivate::vm_death() { 920 // events are disabled (phase has changed) 921 JvmtiEventControllerPrivate::recompute_enabled(); 922 } 923 924 925 /////////////////////////////////////////////////////////////// 926 // 927 // JvmtiEventController 928 // 929 930 JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled; 931 932 bool 933 JvmtiEventController::is_global_event(jvmtiEvent event_type) { 934 assert(is_valid_event_type(event_type), "invalid event type"); 935 jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL); 936 return((bit_for & GLOBAL_EVENT_BITS)!=0); 937 } 938 939 void 940 JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) { 941 if (Threads::number_of_threads() == 0) { 942 // during early VM start-up locks don't exist, but we are safely single threaded, 943 // call the functionality without holding the JvmtiThreadState_lock. 944 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled); 945 } else { 946 MutexLocker mu(JvmtiThreadState_lock); 947 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled); 948 } 949 } 950 951 952 void 953 JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env, 954 const jvmtiEventCallbacks* callbacks, 955 jint size_of_callbacks) { 956 if (Threads::number_of_threads() == 0) { 957 // during early VM start-up locks don't exist, but we are safely single threaded, 958 // call the functionality without holding the JvmtiThreadState_lock. 959 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks); 960 } else { 961 MutexLocker mu(JvmtiThreadState_lock); 962 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks); 963 } 964 } 965 966 void 967 JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env, 968 jint extension_event_index, 969 jvmtiExtensionEvent callback) { 970 if (Threads::number_of_threads() == 0) { 971 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback); 972 } else { 973 MutexLocker mu(JvmtiThreadState_lock); 974 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback); 975 } 976 } 977 978 979 980 981 void 982 JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 983 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); 984 JvmtiEventControllerPrivate::set_frame_pop(ets, fpop); 985 } 986 987 988 void 989 JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 990 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); 991 JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop); 992 } 993 994 995 void 996 JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 997 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); 998 JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop); 999 } 1000 1001 void 1002 JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) { 1003 MutexLocker mu(JvmtiThreadState_lock); 1004 JvmtiEventControllerPrivate::change_field_watch(event_type, added); 1005 } 1006 1007 void 1008 JvmtiEventController::thread_started(JavaThread *thread) { 1009 // operates only on the current thread 1010 // JvmtiThreadState_lock grabbed only if needed. 1011 JvmtiEventControllerPrivate::thread_started(thread); 1012 } 1013 1014 void 1015 JvmtiEventController::thread_ended(JavaThread *thread) { 1016 // operates only on the current thread 1017 // JvmtiThreadState_lock grabbed only if needed. 1018 JvmtiEventControllerPrivate::thread_ended(thread); 1019 } 1020 1021 void 1022 JvmtiEventController::env_initialize(JvmtiEnvBase *env) { 1023 if (Threads::number_of_threads() == 0) { 1024 // during early VM start-up locks don't exist, but we are safely single threaded, 1025 // call the functionality without holding the JvmtiThreadState_lock. 1026 JvmtiEventControllerPrivate::env_initialize(env); 1027 } else { 1028 MutexLocker mu(JvmtiThreadState_lock); 1029 JvmtiEventControllerPrivate::env_initialize(env); 1030 } 1031 } 1032 1033 void 1034 JvmtiEventController::env_dispose(JvmtiEnvBase *env) { 1035 if (Threads::number_of_threads() == 0) { 1036 // during early VM start-up locks don't exist, but we are safely single threaded, 1037 // call the functionality without holding the JvmtiThreadState_lock. 1038 JvmtiEventControllerPrivate::env_dispose(env); 1039 } else { 1040 MutexLocker mu(JvmtiThreadState_lock); 1041 JvmtiEventControllerPrivate::env_dispose(env); 1042 } 1043 } 1044 1045 1046 void 1047 JvmtiEventController::vm_start() { 1048 if (JvmtiEnvBase::environments_might_exist()) { 1049 MutexLocker mu(JvmtiThreadState_lock); 1050 JvmtiEventControllerPrivate::vm_start(); 1051 } 1052 } 1053 1054 void 1055 JvmtiEventController::vm_init() { 1056 if (JvmtiEnvBase::environments_might_exist()) { 1057 MutexLocker mu(JvmtiThreadState_lock); 1058 JvmtiEventControllerPrivate::vm_init(); 1059 } 1060 } 1061 1062 void 1063 JvmtiEventController::vm_death() { 1064 if (JvmtiEnvBase::environments_might_exist()) { 1065 MutexLocker mu(JvmtiThreadState_lock); 1066 JvmtiEventControllerPrivate::vm_death(); 1067 } 1068 }