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/deoptimization.hpp" 36 #include "runtime/frame.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 // VM_EnterInterpOnlyMode 194 // 195 196 class VM_EnterInterpOnlyMode : public VM_Operation { 197 private: 198 JvmtiThreadState *_state; 199 200 public: 201 VM_EnterInterpOnlyMode(JvmtiThreadState *state); 202 203 bool allow_nested_vm_operations() const { return true; } 204 VMOp_Type type() const { return VMOp_EnterInterpOnlyMode; } 205 void doit(); 206 207 // to do: this same function is in jvmtiImpl - should be in one place 208 bool can_be_deoptimized(vframe* vf) { 209 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); 210 } 211 }; 212 213 VM_EnterInterpOnlyMode::VM_EnterInterpOnlyMode(JvmtiThreadState *state) 214 : _state(state) 215 { 216 } 217 218 219 void VM_EnterInterpOnlyMode::doit() { 220 // Set up the current stack depth for later tracking 221 _state->invalidate_cur_stack_depth(); 222 223 _state->enter_interp_only_mode(); 224 225 JavaThread *thread = _state->get_thread(); 226 if (thread->has_last_Java_frame()) { 227 // If running in fullspeed mode, single stepping is implemented 228 // as follows: first, the interpreter does not dispatch to 229 // compiled code for threads that have single stepping enabled; 230 // second, we deoptimize all methods on the thread's stack when 231 // interpreted-only mode is enabled the first time for a given 232 // thread (nothing to do if no Java frames yet). 233 int num_marked = 0; 234 ResourceMark resMark; 235 RegisterMap rm(thread, false); 236 for (vframe* vf = thread->last_java_vframe(&rm); vf; vf = vf->sender()) { 237 if (can_be_deoptimized(vf)) { 238 ((compiledVFrame*) vf)->code()->mark_for_deoptimization(); 239 ++num_marked; 240 } 241 } 242 if (num_marked > 0) { 243 Deoptimization::deoptimize_all_marked(); 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) 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 // When _on == true, we use the safepoint interpreter dispatch table 335 // to allow us to find the single step points. Otherwise, we switch 336 // back to the regular interpreter dispatch table. 337 // Note: We call Interpreter::notice_safepoints() and ignore_safepoints() 338 // in a VM_Operation to safely make the dispatch table switch. We 339 // no longer rely on the safepoint mechanism to do any of this work 340 // for us. 341 void VM_ChangeSingleStep::doit() { 342 log_debug(interpreter, safepoint)("changing single step to '%s'", _on ? "on" : "off"); 343 JvmtiEventControllerPrivate::set_should_post_single_step(_on); 344 if (_on) { 345 Interpreter::notice_safepoints(); 346 } else { 347 Interpreter::ignore_safepoints(); 348 } 349 } 350 351 352 void JvmtiEventControllerPrivate::enter_interp_only_mode(JvmtiThreadState *state) { 353 EC_TRACE(("[%s] # Entering interpreter only mode", 354 JvmtiTrace::safe_get_thread_name(state->get_thread()))); 355 356 VM_EnterInterpOnlyMode op(state); 357 VMThread::execute(&op); 358 } 359 360 361 void 362 JvmtiEventControllerPrivate::leave_interp_only_mode(JvmtiThreadState *state) { 363 EC_TRACE(("[%s] # Leaving interpreter only mode", 364 JvmtiTrace::safe_get_thread_name(state->get_thread()))); 365 state->leave_interp_only_mode(); 366 } 367 368 369 void 370 JvmtiEventControllerPrivate::trace_changed(JvmtiThreadState *state, jlong now_enabled, jlong changed) { 371 #ifdef JVMTI_TRACE 372 if (JvmtiTrace::trace_event_controller()) { 373 SafeResourceMark rm; 374 // traces standard events only 375 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 376 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); 377 if (changed & bit) { 378 // it changed, print it 379 log_trace(jvmti)("[%s] # %s event %s", 380 JvmtiTrace::safe_get_thread_name(state->get_thread()), 381 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei)); 382 } 383 } 384 } 385 #endif /*JVMTI_TRACE */ 386 } 387 388 389 void 390 JvmtiEventControllerPrivate::trace_changed(jlong now_enabled, jlong changed) { 391 #ifdef JVMTI_TRACE 392 if (JvmtiTrace::trace_event_controller()) { 393 SafeResourceMark rm; 394 // traces standard events only 395 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 396 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); 397 if (changed & bit) { 398 // it changed, print it 399 log_trace(jvmti)("[-] # %s event %s", 400 (now_enabled & bit)? "Enabling" : "Disabling", JvmtiTrace::event_name((jvmtiEvent)ei)); 401 } 402 } 403 } 404 #endif /*JVMTI_TRACE */ 405 } 406 407 408 // For the specified env: compute the currently truly enabled events 409 // set external state accordingly. 410 // Return value and set value must include all events. 411 // But outside this class, only non-thread-filtered events can be queried.. 412 jlong 413 JvmtiEventControllerPrivate::recompute_env_enabled(JvmtiEnvBase* env) { 414 jlong was_enabled = env->env_event_enable()->_event_enabled.get_bits(); 415 jlong now_enabled = 416 env->env_event_enable()->_event_callback_enabled.get_bits() & 417 env->env_event_enable()->_event_user_enabled.get_bits(); 418 419 switch (env->phase()) { 420 case JVMTI_PHASE_PRIMORDIAL: 421 case JVMTI_PHASE_ONLOAD: 422 // only these events allowed in primordial or onload phase 423 now_enabled &= (EARLY_EVENT_BITS & ~THREAD_FILTERED_EVENT_BITS); 424 break; 425 case JVMTI_PHASE_START: 426 // only these events allowed in start phase 427 now_enabled &= EARLY_EVENT_BITS; 428 break; 429 case JVMTI_PHASE_LIVE: 430 // all events allowed during live phase 431 break; 432 case JVMTI_PHASE_DEAD: 433 // no events allowed when dead 434 now_enabled = 0; 435 break; 436 default: 437 assert(false, "no other phases - sanity check"); 438 break; 439 } 440 441 // will we really send these events to this env 442 env->env_event_enable()->_event_enabled.set_bits(now_enabled); 443 444 trace_changed(now_enabled, (now_enabled ^ was_enabled) & ~THREAD_FILTERED_EVENT_BITS); 445 446 return now_enabled; 447 } 448 449 450 // For the specified env and thread: compute the currently truly enabled events 451 // set external state accordingly. Only thread-filtered events are included. 452 jlong 453 JvmtiEventControllerPrivate::recompute_env_thread_enabled(JvmtiEnvThreadState* ets, JvmtiThreadState* state) { 454 JvmtiEnv *env = ets->get_env(); 455 456 jlong was_enabled = ets->event_enable()->_event_enabled.get_bits(); 457 jlong now_enabled = THREAD_FILTERED_EVENT_BITS & 458 env->env_event_enable()->_event_callback_enabled.get_bits() & 459 (env->env_event_enable()->_event_user_enabled.get_bits() | 460 ets->event_enable()->_event_user_enabled.get_bits()); 461 462 // for frame pops and field watchs, computed enabled state 463 // is only true if an event has been requested 464 if (!ets->has_frame_pops()) { 465 now_enabled &= ~FRAME_POP_BIT; 466 } 467 if (*((int *)JvmtiExport::get_field_access_count_addr()) == 0) { 468 now_enabled &= ~FIELD_ACCESS_BIT; 469 } 470 if (*((int *)JvmtiExport::get_field_modification_count_addr()) == 0) { 471 now_enabled &= ~FIELD_MODIFICATION_BIT; 472 } 473 474 switch (JvmtiEnv::get_phase()) { 475 case JVMTI_PHASE_DEAD: 476 // no events allowed when dead 477 now_enabled = 0; 478 break; 479 default: 480 break; 481 } 482 483 // if anything changed do update 484 if (now_enabled != was_enabled) { 485 486 // will we really send these events to this thread x env 487 ets->event_enable()->_event_enabled.set_bits(now_enabled); 488 489 // If the enabled status of the single step or breakpoint events changed, 490 // the location status may need to change as well. 491 jlong changed = now_enabled ^ was_enabled; 492 if (changed & SINGLE_STEP_BIT) { 493 ets->reset_current_location(JVMTI_EVENT_SINGLE_STEP, (now_enabled & SINGLE_STEP_BIT) != 0); 494 } 495 if (changed & BREAKPOINT_BIT) { 496 ets->reset_current_location(JVMTI_EVENT_BREAKPOINT, (now_enabled & BREAKPOINT_BIT) != 0); 497 } 498 trace_changed(state, now_enabled, changed); 499 } 500 return now_enabled; 501 } 502 503 504 // For the specified thread: compute the currently truly enabled events 505 // set external state accordingly. Only thread-filtered events are included. 506 jlong 507 JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) { 508 if (state == NULL) { 509 // associated JavaThread is exiting 510 return (jlong)0; 511 } 512 513 julong was_any_env_enabled = state->thread_event_enable()->_event_enabled.get_bits(); 514 julong any_env_enabled = 0; 515 // JVMTI_EVENT_FRAME_POP can be disabled (in the case FRAME_POP_BIT is not set), 516 // but we need to set interp_only if some JvmtiEnvThreadState has frame pop set 517 // to clear the request 518 bool has_frame_pops = false; 519 520 { 521 // This iteration will include JvmtiEnvThreadStates whose environments 522 // have been disposed. These JvmtiEnvThreadStates must not be filtered 523 // as recompute must be called on them to disable their events, 524 JvmtiEnvThreadStateIterator it(state); 525 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 526 any_env_enabled |= recompute_env_thread_enabled(ets, state); 527 has_frame_pops |= ets->has_frame_pops(); 528 } 529 } 530 531 if (any_env_enabled != was_any_env_enabled) { 532 // mark if event is truly enabled on this thread in any environment 533 state->thread_event_enable()->_event_enabled.set_bits(any_env_enabled); 534 535 // update the JavaThread cached value for thread-specific should_post_on_exceptions value 536 bool should_post_on_exceptions = (any_env_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0; 537 state->set_should_post_on_exceptions(should_post_on_exceptions); 538 } 539 540 // compute interp_only mode 541 bool should_be_interp = (any_env_enabled & INTERP_EVENT_BITS) != 0 || has_frame_pops; 542 bool is_now_interp = state->is_interp_only_mode(); 543 544 if (should_be_interp != is_now_interp) { 545 if (should_be_interp) { 546 enter_interp_only_mode(state); 547 } else { 548 leave_interp_only_mode(state); 549 } 550 } 551 552 return any_env_enabled; 553 } 554 555 556 // Compute truly enabled events - meaning if the event can and could be 557 // sent. An event is truly enabled if it is user enabled on the thread 558 // or globally user enabled, but only if there is a callback or event hook 559 // for it and, for field watch and frame pop, one has been set. 560 // Compute if truly enabled, per thread, per environment, per combination 561 // (thread x environment), and overall. These merges are true if any is true. 562 // True per thread if some environment has callback set and the event is globally 563 // enabled or enabled for this thread. 564 // True per environment if the callback is set and the event is globally 565 // enabled in this environment or enabled for any thread in this environment. 566 // True per combination if the environment has the callback set and the 567 // event is globally enabled in this environment or the event is enabled 568 // for this thread and environment. 569 // 570 // All states transitions dependent on these transitions are also handled here. 571 void 572 JvmtiEventControllerPrivate::recompute_enabled() { 573 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 574 575 // event enabled for any thread in any environment 576 julong was_any_env_thread_enabled = JvmtiEventController::_universal_global_event_enabled.get_bits(); 577 julong any_env_thread_enabled = 0; 578 579 EC_TRACE(("[-] # recompute enabled - before " JULONG_FORMAT_X, was_any_env_thread_enabled)); 580 581 // compute non-thread-filters events. 582 // This must be done separately from thread-filtered events, since some 583 // events can occur before any threads exist. 584 JvmtiEnvIterator it; 585 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) { 586 any_env_thread_enabled |= recompute_env_enabled(env); 587 } 588 589 // We need to create any missing jvmti_thread_state if there are globally set thread 590 // filtered events and there weren't last time 591 if ( (any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) != 0 && 592 (was_any_env_thread_enabled & THREAD_FILTERED_EVENT_BITS) == 0) { 593 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) { 594 // state_for_while_locked() makes tp->is_exiting() check 595 JvmtiThreadState::state_for_while_locked(tp); // create the thread state if missing 596 } 597 } 598 599 // compute and set thread-filtered events 600 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) { 601 any_env_thread_enabled |= recompute_thread_enabled(state); 602 } 603 604 // set universal state (across all envs and threads) 605 jlong delta = any_env_thread_enabled ^ was_any_env_thread_enabled; 606 if (delta != 0) { 607 JvmtiExport::set_should_post_field_access((any_env_thread_enabled & FIELD_ACCESS_BIT) != 0); 608 JvmtiExport::set_should_post_field_modification((any_env_thread_enabled & FIELD_MODIFICATION_BIT) != 0); 609 JvmtiExport::set_should_post_class_load((any_env_thread_enabled & CLASS_LOAD_BIT) != 0); 610 JvmtiExport::set_should_post_class_file_load_hook((any_env_thread_enabled & CLASS_FILE_LOAD_HOOK_BIT) != 0); 611 JvmtiExport::set_should_post_native_method_bind((any_env_thread_enabled & NATIVE_METHOD_BIND_BIT) != 0); 612 JvmtiExport::set_should_post_dynamic_code_generated((any_env_thread_enabled & DYNAMIC_CODE_GENERATED_BIT) != 0); 613 JvmtiExport::set_should_post_data_dump((any_env_thread_enabled & DATA_DUMP_BIT) != 0); 614 JvmtiExport::set_should_post_class_prepare((any_env_thread_enabled & CLASS_PREPARE_BIT) != 0); 615 JvmtiExport::set_should_post_class_unload((any_env_thread_enabled & CLASS_UNLOAD_BIT) != 0); 616 JvmtiExport::set_should_post_monitor_contended_enter((any_env_thread_enabled & MONITOR_CONTENDED_ENTER_BIT) != 0); 617 JvmtiExport::set_should_post_monitor_contended_entered((any_env_thread_enabled & MONITOR_CONTENDED_ENTERED_BIT) != 0); 618 JvmtiExport::set_should_post_monitor_wait((any_env_thread_enabled & MONITOR_WAIT_BIT) != 0); 619 JvmtiExport::set_should_post_monitor_waited((any_env_thread_enabled & MONITOR_WAITED_BIT) != 0); 620 JvmtiExport::set_should_post_garbage_collection_start((any_env_thread_enabled & GARBAGE_COLLECTION_START_BIT) != 0); 621 JvmtiExport::set_should_post_garbage_collection_finish((any_env_thread_enabled & GARBAGE_COLLECTION_FINISH_BIT) != 0); 622 JvmtiExport::set_should_post_object_free((any_env_thread_enabled & OBJECT_FREE_BIT) != 0); 623 JvmtiExport::set_should_post_resource_exhausted((any_env_thread_enabled & RESOURCE_EXHAUSTED_BIT) != 0); 624 JvmtiExport::set_should_post_compiled_method_load((any_env_thread_enabled & COMPILED_METHOD_LOAD_BIT) != 0); 625 JvmtiExport::set_should_post_compiled_method_unload((any_env_thread_enabled & COMPILED_METHOD_UNLOAD_BIT) != 0); 626 JvmtiExport::set_should_post_vm_object_alloc((any_env_thread_enabled & VM_OBJECT_ALLOC_BIT) != 0); 627 JvmtiExport::set_should_post_sampled_object_alloc((any_env_thread_enabled & SAMPLED_OBJECT_ALLOC_BIT) != 0); 628 629 // need this if we want thread events or we need them to init data 630 JvmtiExport::set_should_post_thread_life((any_env_thread_enabled & NEED_THREAD_LIFE_EVENTS) != 0); 631 632 // If single stepping is turned on or off, execute the VM op to change it. 633 if (delta & SINGLE_STEP_BIT) { 634 switch (JvmtiEnv::get_phase()) { 635 case JVMTI_PHASE_DEAD: 636 // If the VM is dying we can't execute VM ops 637 break; 638 case JVMTI_PHASE_LIVE: { 639 VM_ChangeSingleStep op((any_env_thread_enabled & SINGLE_STEP_BIT) != 0); 640 VMThread::execute(&op); 641 break; 642 } 643 default: 644 assert(false, "should never come here before live phase"); 645 break; 646 } 647 } 648 649 // set global truly enabled, that is, any thread in any environment 650 JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled); 651 652 // set global should_post_on_exceptions 653 JvmtiExport::set_should_post_on_exceptions((any_env_thread_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0); 654 655 } 656 657 EC_TRACE(("[-] # recompute enabled - after " JULONG_FORMAT_X, any_env_thread_enabled)); 658 } 659 660 661 void 662 JvmtiEventControllerPrivate::thread_started(JavaThread *thread) { 663 assert(thread->is_Java_thread(), "Must be JavaThread"); 664 assert(thread == Thread::current(), "must be current thread"); 665 assert(JvmtiEnvBase::environments_might_exist(), "to enter event controller, JVM TI environments must exist"); 666 667 EC_TRACE(("[%s] # thread started", JvmtiTrace::safe_get_thread_name(thread))); 668 669 // if we have any thread filtered events globally enabled, create/update the thread state 670 if ((JvmtiEventController::_universal_global_event_enabled.get_bits() & THREAD_FILTERED_EVENT_BITS) != 0) { 671 MutexLocker mu(JvmtiThreadState_lock); 672 // create the thread state if missing 673 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread); 674 if (state != NULL) { // skip threads with no JVMTI thread state 675 recompute_thread_enabled(state); 676 } 677 } 678 } 679 680 681 void 682 JvmtiEventControllerPrivate::thread_ended(JavaThread *thread) { 683 // Removes the JvmtiThreadState associated with the specified thread. 684 // May be called after all environments have been disposed. 685 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); 686 687 EC_TRACE(("[%s] # thread ended", JvmtiTrace::safe_get_thread_name(thread))); 688 689 JvmtiThreadState *state = thread->jvmti_thread_state(); 690 assert(state != NULL, "else why are we here?"); 691 delete state; 692 } 693 694 void JvmtiEventControllerPrivate::set_event_callbacks(JvmtiEnvBase *env, 695 const jvmtiEventCallbacks* callbacks, 696 jint size_of_callbacks) { 697 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 698 EC_TRACE(("[*] # set event callbacks")); 699 700 env->set_event_callbacks(callbacks, size_of_callbacks); 701 jlong enabled_bits = 0; 702 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 703 jvmtiEvent evt_t = (jvmtiEvent)ei; 704 if (env->has_callback(evt_t)) { 705 enabled_bits |= JvmtiEventEnabled::bit_for(evt_t); 706 } 707 } 708 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits); 709 recompute_enabled(); 710 } 711 712 void 713 JvmtiEventControllerPrivate::set_extension_event_callback(JvmtiEnvBase *env, 714 jint extension_event_index, 715 jvmtiExtensionEvent callback) 716 { 717 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 718 EC_TRACE(("[*] # set extension event callback")); 719 720 // extension events are allocated below JVMTI_MIN_EVENT_TYPE_VAL 721 assert(extension_event_index >= (jint)EXT_MIN_EVENT_TYPE_VAL && 722 extension_event_index <= (jint)EXT_MAX_EVENT_TYPE_VAL, "sanity check"); 723 724 725 // As the bits for both standard (jvmtiEvent) and extension 726 // (jvmtiExtEvents) are stored in the same word we cast here to 727 // jvmtiEvent to set/clear the bit for this extension event. 728 jvmtiEvent event_type = (jvmtiEvent)extension_event_index; 729 730 // Prevent a possible race condition where events are re-enabled by a call to 731 // set event callbacks, where the DisposeEnvironment occurs after the boiler-plate 732 // environment check and before the lock is acquired. 733 // We can safely do the is_valid check now, as JvmtiThreadState_lock is held. 734 bool enabling = (callback != NULL) && (env->is_valid()); 735 env->env_event_enable()->set_user_enabled(event_type, enabling); 736 737 // update the callback 738 jvmtiExtEventCallbacks* ext_callbacks = env->ext_callbacks(); 739 switch (extension_event_index) { 740 case EXT_EVENT_CLASS_UNLOAD : 741 ext_callbacks->ClassUnload = callback; 742 break; 743 default: 744 ShouldNotReachHere(); 745 } 746 747 // update the callback enable/disable bit 748 jlong enabled_bits = env->env_event_enable()->_event_callback_enabled.get_bits(); 749 jlong bit_for = JvmtiEventEnabled::bit_for(event_type); 750 if (enabling) { 751 enabled_bits |= bit_for; 752 } else { 753 enabled_bits &= ~bit_for; 754 } 755 env->env_event_enable()->_event_callback_enabled.set_bits(enabled_bits); 756 757 recompute_enabled(); 758 } 759 760 761 void 762 JvmtiEventControllerPrivate::env_initialize(JvmtiEnvBase *env) { 763 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 764 EC_TRACE(("[*] # env initialize")); 765 766 if (JvmtiEnvBase::is_vm_live()) { 767 // if we didn't initialize event info already (this is a late 768 // launched environment), do it now. 769 event_init(); 770 } 771 772 env->initialize(); 773 774 // add the JvmtiEnvThreadState to each JvmtiThreadState 775 for (JvmtiThreadState *state = JvmtiThreadState::first(); state != NULL; state = state->next()) { 776 state->add_env(env); 777 assert((JvmtiEnv*)(state->env_thread_state(env)->get_env()) == env, "sanity check"); 778 } 779 JvmtiEventControllerPrivate::recompute_enabled(); 780 } 781 782 783 void 784 JvmtiEventControllerPrivate::env_dispose(JvmtiEnvBase *env) { 785 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 786 EC_TRACE(("[*] # env dispose")); 787 788 // Before the environment is marked disposed, disable all events on this 789 // environment (by zapping the callbacks). As a result, the disposed 790 // environment will not call event handlers. 791 set_event_callbacks(env, NULL, 0); 792 for (jint extension_event_index = EXT_MIN_EVENT_TYPE_VAL; 793 extension_event_index <= EXT_MAX_EVENT_TYPE_VAL; 794 ++extension_event_index) { 795 set_extension_event_callback(env, extension_event_index, NULL); 796 } 797 798 // Let the environment finish disposing itself. 799 env->env_dispose(); 800 } 801 802 803 void 804 JvmtiEventControllerPrivate::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, 805 jvmtiEvent event_type, bool enabled) { 806 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check"); 807 808 EC_TRACE(("[%s] # user %s event %s", 809 thread==NULL? "ALL": JvmtiTrace::safe_get_thread_name(thread), 810 enabled? "enabled" : "disabled", JvmtiTrace::event_name(event_type))); 811 812 if (thread == NULL) { 813 env->env_event_enable()->set_user_enabled(event_type, enabled); 814 } else { 815 // create the thread state (if it didn't exist before) 816 JvmtiThreadState *state = JvmtiThreadState::state_for_while_locked(thread); 817 if (state != NULL) { 818 state->env_thread_state(env)->event_enable()->set_user_enabled(event_type, enabled); 819 } 820 } 821 recompute_enabled(); 822 } 823 824 825 void 826 JvmtiEventControllerPrivate::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 827 EC_TRACE(("[%s] # set frame pop - frame=%d", 828 JvmtiTrace::safe_get_thread_name(ets->get_thread()), 829 fpop.frame_number() )); 830 831 ets->get_frame_pops()->set(fpop); 832 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); 833 } 834 835 836 void 837 JvmtiEventControllerPrivate::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 838 EC_TRACE(("[%s] # clear frame pop - frame=%d", 839 JvmtiTrace::safe_get_thread_name(ets->get_thread()), 840 fpop.frame_number() )); 841 842 ets->get_frame_pops()->clear(fpop); 843 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); 844 } 845 846 847 void 848 JvmtiEventControllerPrivate::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 849 int cleared_cnt = ets->get_frame_pops()->clear_to(fpop); 850 851 EC_TRACE(("[%s] # clear to frame pop - frame=%d, count=%d", 852 JvmtiTrace::safe_get_thread_name(ets->get_thread()), 853 fpop.frame_number(), 854 cleared_cnt )); 855 856 if (cleared_cnt > 0) { 857 recompute_thread_enabled(ets->get_thread()->jvmti_thread_state()); 858 } 859 } 860 861 void 862 JvmtiEventControllerPrivate::change_field_watch(jvmtiEvent event_type, bool added) { 863 int *count_addr; 864 865 switch (event_type) { 866 case JVMTI_EVENT_FIELD_MODIFICATION: 867 count_addr = (int *)JvmtiExport::get_field_modification_count_addr(); 868 break; 869 case JVMTI_EVENT_FIELD_ACCESS: 870 count_addr = (int *)JvmtiExport::get_field_access_count_addr(); 871 break; 872 default: 873 assert(false, "incorrect event"); 874 return; 875 } 876 877 EC_TRACE(("[-] # change field watch - %s %s count=%d", 878 event_type==JVMTI_EVENT_FIELD_MODIFICATION? "modification" : "access", 879 added? "add" : "remove", 880 *count_addr)); 881 882 if (added) { 883 (*count_addr)++; 884 if (*count_addr == 1) { 885 recompute_enabled(); 886 } 887 } else { 888 if (*count_addr > 0) { 889 (*count_addr)--; 890 if (*count_addr == 0) { 891 recompute_enabled(); 892 } 893 } else { 894 assert(false, "field watch out of phase"); 895 } 896 } 897 } 898 899 void 900 JvmtiEventControllerPrivate::event_init() { 901 assert(JvmtiThreadState_lock->is_locked(), "sanity check"); 902 903 if (_initialized) { 904 return; 905 } 906 907 EC_TRACE(("[-] # VM live")); 908 909 #ifdef ASSERT 910 // check that our idea and the spec's idea of threaded events match 911 for (int ei = JVMTI_MIN_EVENT_TYPE_VAL; ei <= JVMTI_MAX_EVENT_TYPE_VAL; ++ei) { 912 jlong bit = JvmtiEventEnabled::bit_for((jvmtiEvent)ei); 913 assert(((THREAD_FILTERED_EVENT_BITS & bit) != 0) == JvmtiUtil::event_threaded(ei), 914 "thread filtered event list does not match"); 915 } 916 #endif 917 918 _initialized = true; 919 } 920 921 void 922 JvmtiEventControllerPrivate::vm_start() { 923 // some events are now able to be enabled (phase has changed) 924 JvmtiEventControllerPrivate::recompute_enabled(); 925 } 926 927 928 void 929 JvmtiEventControllerPrivate::vm_init() { 930 event_init(); 931 932 // all the events are now able to be enabled (phase has changed) 933 JvmtiEventControllerPrivate::recompute_enabled(); 934 } 935 936 937 void 938 JvmtiEventControllerPrivate::vm_death() { 939 // events are disabled (phase has changed) 940 JvmtiEventControllerPrivate::recompute_enabled(); 941 } 942 943 944 /////////////////////////////////////////////////////////////// 945 // 946 // JvmtiEventController 947 // 948 949 JvmtiEventEnabled JvmtiEventController::_universal_global_event_enabled; 950 951 bool 952 JvmtiEventController::is_global_event(jvmtiEvent event_type) { 953 assert(is_valid_event_type(event_type), "invalid event type"); 954 jlong bit_for = ((jlong)1) << (event_type - TOTAL_MIN_EVENT_TYPE_VAL); 955 return((bit_for & GLOBAL_EVENT_BITS)!=0); 956 } 957 958 void 959 JvmtiEventController::set_user_enabled(JvmtiEnvBase *env, JavaThread *thread, jvmtiEvent event_type, bool enabled) { 960 if (Threads::number_of_threads() == 0) { 961 // during early VM start-up locks don't exist, but we are safely single threaded, 962 // call the functionality without holding the JvmtiThreadState_lock. 963 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled); 964 } else { 965 MutexLocker mu(JvmtiThreadState_lock); 966 JvmtiEventControllerPrivate::set_user_enabled(env, thread, event_type, enabled); 967 } 968 } 969 970 971 void 972 JvmtiEventController::set_event_callbacks(JvmtiEnvBase *env, 973 const jvmtiEventCallbacks* callbacks, 974 jint size_of_callbacks) { 975 if (Threads::number_of_threads() == 0) { 976 // during early VM start-up locks don't exist, but we are safely single threaded, 977 // call the functionality without holding the JvmtiThreadState_lock. 978 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks); 979 } else { 980 MutexLocker mu(JvmtiThreadState_lock); 981 JvmtiEventControllerPrivate::set_event_callbacks(env, callbacks, size_of_callbacks); 982 } 983 } 984 985 void 986 JvmtiEventController::set_extension_event_callback(JvmtiEnvBase *env, 987 jint extension_event_index, 988 jvmtiExtensionEvent callback) { 989 if (Threads::number_of_threads() == 0) { 990 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback); 991 } else { 992 MutexLocker mu(JvmtiThreadState_lock); 993 JvmtiEventControllerPrivate::set_extension_event_callback(env, extension_event_index, callback); 994 } 995 } 996 997 998 999 1000 void 1001 JvmtiEventController::set_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 1002 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); 1003 JvmtiEventControllerPrivate::set_frame_pop(ets, fpop); 1004 } 1005 1006 1007 void 1008 JvmtiEventController::clear_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 1009 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); 1010 JvmtiEventControllerPrivate::clear_frame_pop(ets, fpop); 1011 } 1012 1013 1014 void 1015 JvmtiEventController::clear_to_frame_pop(JvmtiEnvThreadState *ets, JvmtiFramePop fpop) { 1016 MutexLocker mu(SafepointSynchronize::is_at_safepoint() ? NULL : JvmtiThreadState_lock); 1017 JvmtiEventControllerPrivate::clear_to_frame_pop(ets, fpop); 1018 } 1019 1020 void 1021 JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) { 1022 MutexLocker mu(JvmtiThreadState_lock); 1023 JvmtiEventControllerPrivate::change_field_watch(event_type, added); 1024 } 1025 1026 void 1027 JvmtiEventController::thread_started(JavaThread *thread) { 1028 // operates only on the current thread 1029 // JvmtiThreadState_lock grabbed only if needed. 1030 JvmtiEventControllerPrivate::thread_started(thread); 1031 } 1032 1033 void 1034 JvmtiEventController::thread_ended(JavaThread *thread) { 1035 // operates only on the current thread 1036 // JvmtiThreadState_lock grabbed only if needed. 1037 JvmtiEventControllerPrivate::thread_ended(thread); 1038 } 1039 1040 void 1041 JvmtiEventController::env_initialize(JvmtiEnvBase *env) { 1042 if (Threads::number_of_threads() == 0) { 1043 // during early VM start-up locks don't exist, but we are safely single threaded, 1044 // call the functionality without holding the JvmtiThreadState_lock. 1045 JvmtiEventControllerPrivate::env_initialize(env); 1046 } else { 1047 MutexLocker mu(JvmtiThreadState_lock); 1048 JvmtiEventControllerPrivate::env_initialize(env); 1049 } 1050 } 1051 1052 void 1053 JvmtiEventController::env_dispose(JvmtiEnvBase *env) { 1054 if (Threads::number_of_threads() == 0) { 1055 // during early VM start-up locks don't exist, but we are safely single threaded, 1056 // call the functionality without holding the JvmtiThreadState_lock. 1057 JvmtiEventControllerPrivate::env_dispose(env); 1058 } else { 1059 MutexLocker mu(JvmtiThreadState_lock); 1060 JvmtiEventControllerPrivate::env_dispose(env); 1061 } 1062 } 1063 1064 1065 void 1066 JvmtiEventController::vm_start() { 1067 if (JvmtiEnvBase::environments_might_exist()) { 1068 MutexLocker mu(JvmtiThreadState_lock); 1069 JvmtiEventControllerPrivate::vm_start(); 1070 } 1071 } 1072 1073 void 1074 JvmtiEventController::vm_init() { 1075 if (JvmtiEnvBase::environments_might_exist()) { 1076 MutexLocker mu(JvmtiThreadState_lock); 1077 JvmtiEventControllerPrivate::vm_init(); 1078 } 1079 } 1080 1081 void 1082 JvmtiEventController::vm_death() { 1083 if (JvmtiEnvBase::environments_might_exist()) { 1084 MutexLocker mu(JvmtiThreadState_lock); 1085 JvmtiEventControllerPrivate::vm_death(); 1086 } 1087 }