1 /* 2 * Copyright (c) 2003, 2022, 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 "classfile/javaClasses.inline.hpp" 27 #include "classfile/moduleEntry.hpp" 28 #include "classfile/vmClasses.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/nmethod.hpp" 31 #include "code/pcDesc.hpp" 32 #include "code/scopeDesc.hpp" 33 #include "gc/shared/oopStorageSet.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "jvmtifiles/jvmtiEnv.hpp" 36 #include "logging/log.hpp" 37 #include "logging/logStream.hpp" 38 #include "memory/allocation.inline.hpp" 39 #include "memory/resourceArea.hpp" 40 #include "memory/universe.hpp" 41 #include "oops/klass.inline.hpp" 42 #include "oops/objArrayKlass.hpp" 43 #include "oops/objArrayOop.hpp" 44 #include "oops/oop.inline.hpp" 45 #include "oops/oopHandle.inline.hpp" 46 #include "prims/jvmtiCodeBlobEvents.hpp" 47 #include "prims/jvmtiEventController.hpp" 48 #include "prims/jvmtiEventController.inline.hpp" 49 #include "prims/jvmtiExport.hpp" 50 #include "prims/jvmtiImpl.hpp" 51 #include "prims/jvmtiManageCapabilities.hpp" 52 #include "prims/jvmtiRawMonitor.hpp" 53 #include "prims/jvmtiRedefineClasses.hpp" 54 #include "prims/jvmtiTagMap.hpp" 55 #include "prims/jvmtiThreadState.inline.hpp" 56 #include "runtime/arguments.hpp" 57 #include "runtime/fieldDescriptor.inline.hpp" 58 #include "runtime/handles.inline.hpp" 59 #include "runtime/interfaceSupport.inline.hpp" 60 #include "runtime/javaCalls.hpp" 61 #include "runtime/javaThread.hpp" 62 #include "runtime/jniHandles.inline.hpp" 63 #include "runtime/keepStackGCProcessed.hpp" 64 #include "runtime/objectMonitor.hpp" 65 #include "runtime/objectMonitor.inline.hpp" 66 #include "runtime/os.hpp" 67 #include "runtime/osThread.hpp" 68 #include "runtime/safepointVerifiers.hpp" 69 #include "runtime/serviceThread.hpp" 70 #include "runtime/threads.hpp" 71 #include "runtime/threadSMR.hpp" 72 #include "runtime/vframe.inline.hpp" 73 #include "runtime/vm_version.hpp" 74 #include "utilities/macros.hpp" 75 76 #ifdef JVMTI_TRACE 77 #define EVT_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_SENT) != 0) { SafeResourceMark rm; log_trace(jvmti) out; } 78 #define EVT_TRIG_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_TRIGGER) != 0) { SafeResourceMark rm; log_trace(jvmti) out; } 79 #else 80 #define EVT_TRIG_TRACE(evt,out) 81 #define EVT_TRACE(evt,out) 82 #endif 83 84 /////////////////////////////////////////////////////////////// 85 // 86 // JvmtiEventTransition 87 // 88 // TO DO -- 89 // more handle purging 90 91 // Use this for JavaThreads and state is _thread_in_vm. 92 class JvmtiJavaThreadEventTransition : StackObj { 93 private: 94 ResourceMark _rm; 95 ThreadToNativeFromVM _transition; 96 HandleMark _hm; 97 98 public: 99 JvmtiJavaThreadEventTransition(JavaThread *thread) : 100 _rm(), 101 _transition(thread), 102 _hm(thread) {}; 103 }; 104 105 // For JavaThreads which are not in _thread_in_vm state 106 // and other system threads use this. 107 class JvmtiThreadEventTransition : StackObj { 108 private: 109 ResourceMark _rm; 110 HandleMark _hm; 111 JavaThreadState _saved_state; 112 JavaThread *_jthread; 113 114 public: 115 JvmtiThreadEventTransition(Thread *thread) : _rm(), _hm(thread) { 116 if (thread->is_Java_thread()) { 117 _jthread = JavaThread::cast(thread); 118 _saved_state = _jthread->thread_state(); 119 if (_saved_state == _thread_in_Java) { 120 ThreadStateTransition::transition_from_java(_jthread, _thread_in_native); 121 } else { 122 ThreadStateTransition::transition_from_vm(_jthread, _thread_in_native); 123 } 124 } else { 125 _jthread = NULL; 126 } 127 } 128 129 ~JvmtiThreadEventTransition() { 130 if (_jthread != NULL) 131 ThreadStateTransition::transition_from_native(_jthread, _saved_state); 132 } 133 }; 134 135 136 /////////////////////////////////////////////////////////////// 137 // 138 // JvmtiEventMark 139 // 140 141 class JvmtiEventMark : public StackObj { 142 private: 143 JavaThread *_thread; 144 JNIEnv* _jni_env; 145 JvmtiThreadState::ExceptionState _saved_exception_state; 146 147 public: 148 JvmtiEventMark(JavaThread *thread) : _thread(thread), 149 _jni_env(thread->jni_environment()), 150 _saved_exception_state(JvmtiThreadState::ES_CLEARED) { 151 JvmtiThreadState *state = thread->jvmti_thread_state(); 152 // we are before an event. 153 // Save current jvmti thread exception state. 154 if (state != NULL) { 155 _saved_exception_state = state->get_exception_state(); 156 } 157 158 thread->push_jni_handle_block(); 159 assert(thread == JavaThread::current(), "thread must be current!"); 160 thread->frame_anchor()->make_walkable(); 161 }; 162 163 ~JvmtiEventMark() { 164 _thread->pop_jni_handle_block(); 165 166 JvmtiThreadState* state = _thread->jvmti_thread_state(); 167 // we are continuing after an event. 168 if (state != NULL) { 169 // Restore the jvmti thread exception state. 170 state->restore_exception_state(_saved_exception_state); 171 } 172 } 173 174 jobject to_jobject(oop obj) { return JNIHandles::make_local(_thread,obj); } 175 176 jclass to_jclass(Klass* klass) { return (klass == NULL ? NULL : (jclass)to_jobject(klass->java_mirror())); } 177 178 jmethodID to_jmethodID(const methodHandle& method) { return method->jmethod_id(); } 179 180 JNIEnv* jni_env() { return _jni_env; } 181 }; 182 183 class JvmtiThreadEventMark : public JvmtiEventMark { 184 private: 185 jobject _jthread; 186 187 public: 188 JvmtiThreadEventMark(JavaThread *thread) : 189 JvmtiEventMark(thread) { 190 _jthread = to_jobject(thread->threadObj()); 191 }; 192 jthread jni_thread() { return (jthread)_jthread; } 193 }; 194 195 class JvmtiVirtualThreadEventMark : public JvmtiEventMark { 196 private: 197 jobject _jthread; 198 199 public: 200 JvmtiVirtualThreadEventMark(JavaThread *thread) : 201 JvmtiEventMark(thread) { 202 assert(thread->vthread() != NULL || thread->threadObj() == NULL, "sanity check"); 203 _jthread = to_jobject(thread->vthread()); 204 }; 205 jthread jni_thread() { return (jthread)_jthread; } 206 }; 207 208 class JvmtiClassEventMark : public JvmtiVirtualThreadEventMark { 209 private: 210 jclass _jc; 211 212 public: 213 JvmtiClassEventMark(JavaThread *thread, Klass* klass) : 214 JvmtiVirtualThreadEventMark(thread) { 215 _jc = to_jclass(klass); 216 }; 217 jclass jni_class() { return _jc; } 218 }; 219 220 class JvmtiMethodEventMark : public JvmtiVirtualThreadEventMark { 221 private: 222 jmethodID _mid; 223 224 public: 225 JvmtiMethodEventMark(JavaThread *thread, const methodHandle& method) : 226 JvmtiVirtualThreadEventMark(thread), 227 _mid(to_jmethodID(method)) {}; 228 jmethodID jni_methodID() { return _mid; } 229 }; 230 231 class JvmtiLocationEventMark : public JvmtiMethodEventMark { 232 private: 233 jlocation _loc; 234 235 public: 236 JvmtiLocationEventMark(JavaThread *thread, const methodHandle& method, address location) : 237 JvmtiMethodEventMark(thread, method), 238 _loc(location - method->code_base()) {}; 239 jlocation location() { return _loc; } 240 }; 241 242 class JvmtiExceptionEventMark : public JvmtiLocationEventMark { 243 private: 244 jobject _exc; 245 246 public: 247 JvmtiExceptionEventMark(JavaThread *thread, const methodHandle& method, address location, Handle exception) : 248 JvmtiLocationEventMark(thread, method, location), 249 _exc(to_jobject(exception())) {}; 250 jobject exception() { return _exc; } 251 }; 252 253 class JvmtiClassFileLoadEventMark : public JvmtiThreadEventMark { 254 private: 255 const char *_class_name; 256 jobject _jloader; 257 jobject _protection_domain; 258 jclass _class_being_redefined; 259 260 public: 261 JvmtiClassFileLoadEventMark(JavaThread *thread, Symbol* name, 262 Handle class_loader, Handle prot_domain, Klass* class_being_redefined) : JvmtiThreadEventMark(thread) { 263 _class_name = name != NULL? name->as_utf8() : NULL; 264 _jloader = (jobject)to_jobject(class_loader()); 265 _protection_domain = (jobject)to_jobject(prot_domain()); 266 if (class_being_redefined == NULL) { 267 _class_being_redefined = NULL; 268 } else { 269 _class_being_redefined = (jclass)to_jclass(class_being_redefined); 270 } 271 }; 272 const char *class_name() { 273 return _class_name; 274 } 275 jobject jloader() { 276 return _jloader; 277 } 278 jobject protection_domain() { 279 return _protection_domain; 280 } 281 jclass class_being_redefined() { 282 return _class_being_redefined; 283 } 284 }; 285 286 ////////////////////////////////////////////////////////////////////////////// 287 288 int JvmtiExport::_field_access_count = 0; 289 int JvmtiExport::_field_modification_count = 0; 290 291 bool JvmtiExport::_can_access_local_variables = false; 292 bool JvmtiExport::_can_hotswap_or_post_breakpoint = false; 293 bool JvmtiExport::_can_modify_any_class = false; 294 bool JvmtiExport::_can_walk_any_space = false; 295 296 uint64_t JvmtiExport::_redefinition_count = 0; 297 bool JvmtiExport::_all_dependencies_are_recorded = false; 298 299 // 300 // field access management 301 // 302 303 // interpreter generator needs the address of the counter 304 address JvmtiExport::get_field_access_count_addr() { 305 // We don't grab a lock because we don't want to 306 // serialize field access between all threads. This means that a 307 // thread on another processor can see the wrong count value and 308 // may either miss making a needed call into post_field_access() 309 // or will make an unneeded call into post_field_access(). We pay 310 // this price to avoid slowing down the VM when we aren't watching 311 // field accesses. 312 // Other access/mutation safe by virtue of being in VM state. 313 return (address)(&_field_access_count); 314 } 315 316 // 317 // field modification management 318 // 319 320 // interpreter generator needs the address of the counter 321 address JvmtiExport::get_field_modification_count_addr() { 322 // We don't grab a lock because we don't 323 // want to serialize field modification between all threads. This 324 // means that a thread on another processor can see the wrong 325 // count value and may either miss making a needed call into 326 // post_field_modification() or will make an unneeded call into 327 // post_field_modification(). We pay this price to avoid slowing 328 // down the VM when we aren't watching field modifications. 329 // Other access/mutation safe by virtue of being in VM state. 330 return (address)(&_field_modification_count); 331 } 332 333 334 /////////////////////////////////////////////////////////////// 335 // Functions needed by java.lang.instrument for starting up javaagent. 336 /////////////////////////////////////////////////////////////// 337 338 jint 339 JvmtiExport::get_jvmti_interface(JavaVM *jvm, void **penv, jint version) { 340 // The JVMTI_VERSION_INTERFACE_JVMTI part of the version number 341 // has already been validated in JNI GetEnv(). 342 int major, minor, micro; 343 344 // micro version doesn't matter here (yet?) 345 decode_version_values(version, &major, &minor, µ); 346 switch (major) { 347 case 1: 348 switch (minor) { 349 case 0: // version 1.0.<micro> is recognized 350 case 1: // version 1.1.<micro> is recognized 351 case 2: // version 1.2.<micro> is recognized 352 break; 353 354 default: 355 return JNI_EVERSION; // unsupported minor version number 356 } 357 break; 358 case 9: 359 switch (minor) { 360 case 0: // version 9.0.<micro> is recognized 361 break; 362 default: 363 return JNI_EVERSION; // unsupported minor version number 364 } 365 break; 366 case 11: 367 switch (minor) { 368 case 0: // version 11.0.<micro> is recognized 369 break; 370 default: 371 return JNI_EVERSION; // unsupported minor version number 372 } 373 break; 374 default: 375 // Starting from 13 we do not care about minor version anymore 376 if (major < 13 || major > VM_Version::vm_major_version()) { 377 return JNI_EVERSION; // unsupported major version number 378 } 379 } 380 if (Continuations::enabled()) { 381 // Virtual threads support. There is a performance impact when VTMS transitions are enabled. 382 java_lang_VirtualThread::set_notify_jvmti_events(true); 383 if (JvmtiEnv::get_phase() == JVMTI_PHASE_LIVE) { 384 ThreadInVMfromNative __tiv(JavaThread::current()); 385 java_lang_VirtualThread::init_static_notify_jvmti_events(); 386 } 387 } 388 389 if (JvmtiEnv::get_phase() == JVMTI_PHASE_LIVE) { 390 JavaThread* current_thread = JavaThread::current(); 391 // transition code: native to VM 392 ThreadInVMfromNative __tiv(current_thread); 393 VM_ENTRY_BASE(jvmtiEnv*, JvmtiExport::get_jvmti_interface, current_thread) 394 debug_only(VMNativeEntryWrapper __vew;) 395 396 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version); 397 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv* 398 return JNI_OK; 399 400 } else if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) { 401 // not live, no thread to transition 402 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version); 403 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv* 404 return JNI_OK; 405 406 } else { 407 // Called at the wrong time 408 *penv = NULL; 409 return JNI_EDETACHED; 410 } 411 } 412 413 void 414 JvmtiExport::add_default_read_edges(Handle h_module, TRAPS) { 415 if (!Universe::is_module_initialized()) { 416 return; // extra safety 417 } 418 assert(!h_module.is_null(), "module should always be set"); 419 420 // Invoke the transformedByAgent method 421 JavaValue result(T_VOID); 422 JavaCalls::call_static(&result, 423 vmClasses::module_Modules_klass(), 424 vmSymbols::transformedByAgent_name(), 425 vmSymbols::transformedByAgent_signature(), 426 h_module, 427 THREAD); 428 429 if (HAS_PENDING_EXCEPTION) { 430 LogTarget(Trace, jvmti) log; 431 LogStream log_stream(log); 432 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 433 log_stream.cr(); 434 CLEAR_PENDING_EXCEPTION; 435 return; 436 } 437 } 438 439 jvmtiError 440 JvmtiExport::add_module_reads(Handle module, Handle to_module, TRAPS) { 441 if (!Universe::is_module_initialized()) { 442 return JVMTI_ERROR_NONE; // extra safety 443 } 444 assert(!module.is_null(), "module should always be set"); 445 assert(!to_module.is_null(), "to_module should always be set"); 446 447 // Invoke the addReads method 448 JavaValue result(T_VOID); 449 JavaCalls::call_static(&result, 450 vmClasses::module_Modules_klass(), 451 vmSymbols::addReads_name(), 452 vmSymbols::addReads_signature(), 453 module, 454 to_module, 455 THREAD); 456 457 if (HAS_PENDING_EXCEPTION) { 458 LogTarget(Trace, jvmti) log; 459 LogStream log_stream(log); 460 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 461 log_stream.cr(); 462 CLEAR_PENDING_EXCEPTION; 463 return JVMTI_ERROR_INTERNAL; 464 } 465 return JVMTI_ERROR_NONE; 466 } 467 468 jvmtiError 469 JvmtiExport::add_module_exports(Handle module, Handle pkg_name, Handle to_module, TRAPS) { 470 if (!Universe::is_module_initialized()) { 471 return JVMTI_ERROR_NONE; // extra safety 472 } 473 assert(!module.is_null(), "module should always be set"); 474 assert(!to_module.is_null(), "to_module should always be set"); 475 assert(!pkg_name.is_null(), "pkg_name should always be set"); 476 477 // Invoke the addExports method 478 JavaValue result(T_VOID); 479 JavaCalls::call_static(&result, 480 vmClasses::module_Modules_klass(), 481 vmSymbols::addExports_name(), 482 vmSymbols::addExports_signature(), 483 module, 484 pkg_name, 485 to_module, 486 THREAD); 487 488 if (HAS_PENDING_EXCEPTION) { 489 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); 490 LogTarget(Trace, jvmti) log; 491 LogStream log_stream(log); 492 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 493 log_stream.cr(); 494 CLEAR_PENDING_EXCEPTION; 495 if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) { 496 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 497 } 498 return JVMTI_ERROR_INTERNAL; 499 } 500 return JVMTI_ERROR_NONE; 501 } 502 503 jvmtiError 504 JvmtiExport::add_module_opens(Handle module, Handle pkg_name, Handle to_module, TRAPS) { 505 if (!Universe::is_module_initialized()) { 506 return JVMTI_ERROR_NONE; // extra safety 507 } 508 assert(!module.is_null(), "module should always be set"); 509 assert(!to_module.is_null(), "to_module should always be set"); 510 assert(!pkg_name.is_null(), "pkg_name should always be set"); 511 512 // Invoke the addOpens method 513 JavaValue result(T_VOID); 514 JavaCalls::call_static(&result, 515 vmClasses::module_Modules_klass(), 516 vmSymbols::addOpens_name(), 517 vmSymbols::addExports_signature(), 518 module, 519 pkg_name, 520 to_module, 521 THREAD); 522 523 if (HAS_PENDING_EXCEPTION) { 524 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); 525 LogTarget(Trace, jvmti) log; 526 LogStream log_stream(log); 527 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 528 log_stream.cr(); 529 CLEAR_PENDING_EXCEPTION; 530 if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) { 531 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 532 } 533 return JVMTI_ERROR_INTERNAL; 534 } 535 return JVMTI_ERROR_NONE; 536 } 537 538 jvmtiError 539 JvmtiExport::add_module_uses(Handle module, Handle service, TRAPS) { 540 if (!Universe::is_module_initialized()) { 541 return JVMTI_ERROR_NONE; // extra safety 542 } 543 assert(!module.is_null(), "module should always be set"); 544 assert(!service.is_null(), "service should always be set"); 545 546 // Invoke the addUses method 547 JavaValue result(T_VOID); 548 JavaCalls::call_static(&result, 549 vmClasses::module_Modules_klass(), 550 vmSymbols::addUses_name(), 551 vmSymbols::addUses_signature(), 552 module, 553 service, 554 THREAD); 555 556 if (HAS_PENDING_EXCEPTION) { 557 LogTarget(Trace, jvmti) log; 558 LogStream log_stream(log); 559 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 560 log_stream.cr(); 561 CLEAR_PENDING_EXCEPTION; 562 return JVMTI_ERROR_INTERNAL; 563 } 564 return JVMTI_ERROR_NONE; 565 } 566 567 jvmtiError 568 JvmtiExport::add_module_provides(Handle module, Handle service, Handle impl_class, TRAPS) { 569 if (!Universe::is_module_initialized()) { 570 return JVMTI_ERROR_NONE; // extra safety 571 } 572 assert(!module.is_null(), "module should always be set"); 573 assert(!service.is_null(), "service should always be set"); 574 assert(!impl_class.is_null(), "impl_class should always be set"); 575 576 // Invoke the addProvides method 577 JavaValue result(T_VOID); 578 JavaCalls::call_static(&result, 579 vmClasses::module_Modules_klass(), 580 vmSymbols::addProvides_name(), 581 vmSymbols::addProvides_signature(), 582 module, 583 service, 584 impl_class, 585 THREAD); 586 587 if (HAS_PENDING_EXCEPTION) { 588 LogTarget(Trace, jvmti) log; 589 LogStream log_stream(log); 590 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 591 log_stream.cr(); 592 CLEAR_PENDING_EXCEPTION; 593 return JVMTI_ERROR_INTERNAL; 594 } 595 return JVMTI_ERROR_NONE; 596 } 597 598 void 599 JvmtiExport::decode_version_values(jint version, int * major, int * minor, 600 int * micro) { 601 *major = (version & JVMTI_VERSION_MASK_MAJOR) >> JVMTI_VERSION_SHIFT_MAJOR; 602 *minor = (version & JVMTI_VERSION_MASK_MINOR) >> JVMTI_VERSION_SHIFT_MINOR; 603 *micro = (version & JVMTI_VERSION_MASK_MICRO) >> JVMTI_VERSION_SHIFT_MICRO; 604 } 605 606 void JvmtiExport::enter_primordial_phase() { 607 JvmtiEnvBase::set_phase(JVMTI_PHASE_PRIMORDIAL); 608 } 609 610 void JvmtiExport::enter_early_start_phase() { 611 set_early_vmstart_recorded(true); 612 } 613 614 void JvmtiExport::enter_start_phase() { 615 JvmtiEnvBase::set_phase(JVMTI_PHASE_START); 616 } 617 618 void JvmtiExport::enter_onload_phase() { 619 JvmtiEnvBase::set_phase(JVMTI_PHASE_ONLOAD); 620 } 621 622 void JvmtiExport::enter_live_phase() { 623 JvmtiEnvBase::set_phase(JVMTI_PHASE_LIVE); 624 } 625 626 // 627 // JVMTI events that the VM posts to the debugger and also startup agent 628 // and call the agent's premain() for java.lang.instrument. 629 // 630 631 void JvmtiExport::post_early_vm_start() { 632 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg Early VM start event triggered" )); 633 634 // can now enable some events 635 JvmtiEventController::vm_start(); 636 637 JvmtiEnvIterator it; 638 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 639 // Only early vmstart envs post early VMStart event 640 if (env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) { 641 EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt Early VM start event sent" )); 642 JavaThread *thread = JavaThread::current(); 643 JvmtiThreadEventMark jem(thread); 644 JvmtiJavaThreadEventTransition jet(thread); 645 jvmtiEventVMStart callback = env->callbacks()->VMStart; 646 if (callback != NULL) { 647 (*callback)(env->jvmti_external(), jem.jni_env()); 648 } 649 } 650 } 651 } 652 653 void JvmtiExport::post_vm_start() { 654 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg VM start event triggered" )); 655 656 // can now enable some events 657 JvmtiEventController::vm_start(); 658 659 JvmtiEnvIterator it; 660 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 661 // Early vmstart envs do not post normal VMStart event 662 if (!env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) { 663 EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt VM start event sent" )); 664 665 JavaThread *thread = JavaThread::current(); 666 JvmtiThreadEventMark jem(thread); 667 JvmtiJavaThreadEventTransition jet(thread); 668 jvmtiEventVMStart callback = env->callbacks()->VMStart; 669 if (callback != NULL) { 670 (*callback)(env->jvmti_external(), jem.jni_env()); 671 } 672 } 673 } 674 } 675 676 static OopStorage* _jvmti_oop_storage = NULL; 677 static OopStorage* _weak_tag_storage = NULL; 678 679 OopStorage* JvmtiExport::jvmti_oop_storage() { 680 assert(_jvmti_oop_storage != NULL, "not yet initialized"); 681 return _jvmti_oop_storage; 682 } 683 684 OopStorage* JvmtiExport::weak_tag_storage() { 685 assert(_weak_tag_storage != NULL, "not yet initialized"); 686 return _weak_tag_storage; 687 } 688 689 void JvmtiExport::initialize_oop_storage() { 690 // OopStorage needs to be created early in startup and unconditionally 691 // because of OopStorageSet static array indices. 692 _jvmti_oop_storage = OopStorageSet::create_strong("JVMTI OopStorage", mtServiceability); 693 _weak_tag_storage = OopStorageSet::create_weak("JVMTI Tag Weak OopStorage", mtServiceability); 694 _weak_tag_storage->register_num_dead_callback(&JvmtiTagMap::gc_notification); 695 } 696 697 void JvmtiExport::post_vm_initialized() { 698 EVT_TRIG_TRACE(JVMTI_EVENT_VM_INIT, ("Trg VM init event triggered" )); 699 700 // can now enable events 701 JvmtiEventController::vm_init(); 702 703 JvmtiEnvIterator it; 704 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 705 if (env->is_enabled(JVMTI_EVENT_VM_INIT)) { 706 EVT_TRACE(JVMTI_EVENT_VM_INIT, ("Evt VM init event sent" )); 707 708 JavaThread *thread = JavaThread::current(); 709 JvmtiThreadEventMark jem(thread); 710 JvmtiJavaThreadEventTransition jet(thread); 711 jvmtiEventVMInit callback = env->callbacks()->VMInit; 712 if (callback != NULL) { 713 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread()); 714 } 715 } 716 } 717 } 718 719 720 void JvmtiExport::post_vm_death() { 721 EVT_TRIG_TRACE(JVMTI_EVENT_VM_DEATH, ("Trg VM death event triggered" )); 722 723 JvmtiTagMap::flush_all_object_free_events(); 724 725 JvmtiEnvIterator it; 726 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 727 if (env->is_enabled(JVMTI_EVENT_VM_DEATH)) { 728 EVT_TRACE(JVMTI_EVENT_VM_DEATH, ("Evt VM death event sent" )); 729 730 JavaThread *thread = JavaThread::current(); 731 JvmtiEventMark jem(thread); 732 JvmtiJavaThreadEventTransition jet(thread); 733 jvmtiEventVMDeath callback = env->callbacks()->VMDeath; 734 if (callback != NULL) { 735 (*callback)(env->jvmti_external(), jem.jni_env()); 736 } 737 } 738 } 739 740 JvmtiEnvBase::set_phase(JVMTI_PHASE_DEAD); 741 JvmtiEventController::vm_death(); 742 } 743 744 char** 745 JvmtiExport::get_all_native_method_prefixes(int* count_ptr) { 746 // Have to grab JVMTI thread state lock to be sure environment doesn't 747 // go away while we iterate them. No locks during VM bring-up. 748 if (Threads::number_of_threads() == 0 || SafepointSynchronize::is_at_safepoint()) { 749 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr); 750 } else { 751 MutexLocker mu(JvmtiThreadState_lock); 752 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr); 753 } 754 } 755 756 // Convert an external thread reference to a JavaThread found on the 757 // specified ThreadsList. The ThreadsListHandle in the caller "protects" 758 // the returned JavaThread *. 759 // 760 // If thread_oop_p is not NULL, then the caller wants to use the oop 761 // after this call so the oop is returned. On success, *jt_pp is set 762 // to the converted JavaThread * and JVMTI_ERROR_NONE is returned. 763 // On error, returns various JVMTI_ERROR_* values. 764 // 765 jvmtiError 766 JvmtiExport::cv_external_thread_to_JavaThread(ThreadsList * t_list, 767 jthread thread, 768 JavaThread ** jt_pp, 769 oop * thread_oop_p) { 770 assert(t_list != NULL, "must have a ThreadsList"); 771 assert(jt_pp != NULL, "must have a return JavaThread pointer"); 772 // thread_oop_p is optional so no assert() 773 774 if (thread_oop_p != NULL) { 775 *thread_oop_p = NULL; 776 } 777 778 oop thread_oop = JNIHandles::resolve_external_guard(thread); 779 if (thread_oop == NULL) { 780 // NULL jthread, GC'ed jthread or a bad JNI handle. 781 return JVMTI_ERROR_INVALID_THREAD; 782 } 783 // Looks like an oop at this point. 784 785 if (!thread_oop->is_a(vmClasses::Thread_klass())) { 786 // The oop is not a java.lang.Thread. 787 return JVMTI_ERROR_INVALID_THREAD; 788 } 789 // Looks like a java.lang.Thread oop at this point. 790 791 if (thread_oop_p != NULL) { 792 // Return the oop to the caller; the caller may still want 793 // the oop even if this function returns an error. 794 *thread_oop_p = thread_oop; 795 } 796 797 JavaThread * java_thread = java_lang_Thread::thread(thread_oop); 798 if (java_thread == NULL) { 799 if (java_lang_VirtualThread::is_instance(thread_oop)) { 800 return JVMTI_ERROR_INVALID_THREAD; 801 } 802 // The java.lang.Thread does not contain a JavaThread * so it has 803 // not yet run or it has died. 804 return JVMTI_ERROR_THREAD_NOT_ALIVE; 805 } 806 // Looks like a live JavaThread at this point. 807 808 // We do not check the EnableThreadSMRExtraValidityChecks option 809 // for this includes() call because JVM/TI's spec is tighter. 810 if (!t_list->includes(java_thread)) { 811 // Not on the JavaThreads list so it is not alive. 812 return JVMTI_ERROR_THREAD_NOT_ALIVE; 813 } 814 815 // Return a live JavaThread that is "protected" by the 816 // ThreadsListHandle in the caller. 817 *jt_pp = java_thread; 818 819 return JVMTI_ERROR_NONE; 820 } 821 822 // Convert an oop to a JavaThread found on the specified ThreadsList. 823 // The ThreadsListHandle in the caller "protects" the returned 824 // JavaThread *. 825 // 826 // On success, *jt_pp is set to the converted JavaThread * and 827 // JVMTI_ERROR_NONE is returned. On error, returns various 828 // JVMTI_ERROR_* values. 829 // 830 jvmtiError 831 JvmtiExport::cv_oop_to_JavaThread(ThreadsList * t_list, oop thread_oop, 832 JavaThread ** jt_pp) { 833 assert(t_list != NULL, "must have a ThreadsList"); 834 assert(thread_oop != NULL, "must have an oop"); 835 assert(jt_pp != NULL, "must have a return JavaThread pointer"); 836 837 if (!thread_oop->is_a(vmClasses::Thread_klass())) { 838 // The oop is not a java.lang.Thread. 839 return JVMTI_ERROR_INVALID_THREAD; 840 } 841 // Looks like a java.lang.Thread oop at this point. 842 843 JavaThread * java_thread = java_lang_Thread::thread(thread_oop); 844 if (java_thread == NULL) { 845 // The java.lang.Thread does not contain a JavaThread * so it has 846 // not yet run or it has died. 847 return JVMTI_ERROR_THREAD_NOT_ALIVE; 848 } 849 // Looks like a live JavaThread at this point. 850 851 // We do not check the EnableThreadSMRExtraValidityChecks option 852 // for this includes() call because JVM/TI's spec is tighter. 853 if (!t_list->includes(java_thread)) { 854 // Not on the JavaThreads list so it is not alive. 855 return JVMTI_ERROR_THREAD_NOT_ALIVE; 856 } 857 858 // Return a live JavaThread that is "protected" by the 859 // ThreadsListHandle in the caller. 860 *jt_pp = java_thread; 861 862 return JVMTI_ERROR_NONE; 863 } 864 865 class JvmtiClassFileLoadHookPoster : public StackObj { 866 private: 867 Symbol* _h_name; 868 Handle _class_loader; 869 Handle _h_protection_domain; 870 unsigned char ** _data_ptr; 871 unsigned char ** _end_ptr; 872 JavaThread * _thread; 873 jint _curr_len; 874 unsigned char * _curr_data; 875 JvmtiEnv * _curr_env; 876 JvmtiCachedClassFileData ** _cached_class_file_ptr; 877 JvmtiThreadState * _state; 878 Klass* _class_being_redefined; 879 JvmtiClassLoadKind _load_kind; 880 bool _has_been_modified; 881 882 public: 883 inline JvmtiClassFileLoadHookPoster(Symbol* h_name, Handle class_loader, 884 Handle h_protection_domain, 885 unsigned char **data_ptr, unsigned char **end_ptr, 886 JvmtiCachedClassFileData **cache_ptr) { 887 _h_name = h_name; 888 _class_loader = class_loader; 889 _h_protection_domain = h_protection_domain; 890 _data_ptr = data_ptr; 891 _end_ptr = end_ptr; 892 _thread = JavaThread::current(); 893 _curr_len = *end_ptr - *data_ptr; 894 _curr_data = *data_ptr; 895 _curr_env = NULL; 896 _cached_class_file_ptr = cache_ptr; 897 _has_been_modified = false; 898 899 assert(!_thread->is_in_any_VTMS_transition(), "CFLH events are not allowed in any VTMS transition"); 900 _state = _thread->jvmti_thread_state(); 901 if (_state != NULL) { 902 _class_being_redefined = _state->get_class_being_redefined(); 903 _load_kind = _state->get_class_load_kind(); 904 Klass* klass = (_class_being_redefined == NULL) ? NULL : _class_being_redefined; 905 if (_load_kind != jvmti_class_load_kind_load && klass != NULL) { 906 ModuleEntry* module_entry = InstanceKlass::cast(klass)->module(); 907 assert(module_entry != NULL, "module_entry should always be set"); 908 if (module_entry->is_named() && 909 module_entry->module() != NULL && 910 !module_entry->has_default_read_edges()) { 911 if (!module_entry->set_has_default_read_edges()) { 912 // We won a potential race. 913 // Add read edges to the unnamed modules of the bootstrap and app class loaders 914 Handle class_module(_thread, module_entry->module()); // Obtain j.l.r.Module 915 JvmtiExport::add_default_read_edges(class_module, _thread); 916 } 917 } 918 } 919 // Clear class_being_redefined flag here. The action 920 // from agent handler could generate a new class file load 921 // hook event and if it is not cleared the new event generated 922 // from regular class file load could have this stale redefined 923 // class handle info. 924 _state->clear_class_being_redefined(); 925 } else { 926 // redefine and retransform will always set the thread state 927 _class_being_redefined = NULL; 928 _load_kind = jvmti_class_load_kind_load; 929 } 930 } 931 932 void post() { 933 post_all_envs(); 934 copy_modified_data(); 935 } 936 937 bool has_been_modified() { return _has_been_modified; } 938 939 private: 940 void post_all_envs() { 941 if (_load_kind != jvmti_class_load_kind_retransform) { 942 // for class load and redefine, 943 // call the non-retransformable agents 944 JvmtiEnvIterator it; 945 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 946 if (!env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) { 947 // non-retransformable agents cannot retransform back, 948 // so no need to cache the original class file bytes 949 post_to_env(env, false); 950 } 951 } 952 } 953 JvmtiEnvIterator it; 954 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 955 // retransformable agents get all events 956 if (env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) { 957 // retransformable agents need to cache the original class file 958 // bytes if changes are made via the ClassFileLoadHook 959 post_to_env(env, true); 960 } 961 } 962 } 963 964 void post_to_env(JvmtiEnv* env, bool caching_needed) { 965 if (env->phase() == JVMTI_PHASE_PRIMORDIAL && !env->early_class_hook_env()) { 966 return; 967 } 968 unsigned char *new_data = NULL; 969 jint new_len = 0; 970 JvmtiClassFileLoadEventMark jem(_thread, _h_name, _class_loader, 971 _h_protection_domain, 972 _class_being_redefined); 973 JvmtiJavaThreadEventTransition jet(_thread); 974 jvmtiEventClassFileLoadHook callback = env->callbacks()->ClassFileLoadHook; 975 if (callback != NULL) { 976 (*callback)(env->jvmti_external(), jem.jni_env(), 977 jem.class_being_redefined(), 978 jem.jloader(), jem.class_name(), 979 jem.protection_domain(), 980 _curr_len, _curr_data, 981 &new_len, &new_data); 982 } 983 if (new_data != NULL) { 984 // this agent has modified class data. 985 _has_been_modified = true; 986 if (caching_needed && *_cached_class_file_ptr == NULL) { 987 // data has been changed by the new retransformable agent 988 // and it hasn't already been cached, cache it 989 JvmtiCachedClassFileData *p; 990 p = (JvmtiCachedClassFileData *)os::malloc( 991 offset_of(JvmtiCachedClassFileData, data) + _curr_len, mtInternal); 992 if (p == NULL) { 993 vm_exit_out_of_memory(offset_of(JvmtiCachedClassFileData, data) + _curr_len, 994 OOM_MALLOC_ERROR, 995 "unable to allocate cached copy of original class bytes"); 996 } 997 p->length = _curr_len; 998 memcpy(p->data, _curr_data, _curr_len); 999 *_cached_class_file_ptr = p; 1000 } 1001 1002 if (_curr_data != *_data_ptr) { 1003 // curr_data is previous agent modified class data. 1004 // And this has been changed by the new agent so 1005 // we can delete it now. 1006 _curr_env->Deallocate(_curr_data); 1007 } 1008 1009 // Class file data has changed by the current agent. 1010 _curr_data = new_data; 1011 _curr_len = new_len; 1012 // Save the current agent env we need this to deallocate the 1013 // memory allocated by this agent. 1014 _curr_env = env; 1015 } 1016 } 1017 1018 void copy_modified_data() { 1019 // if one of the agent has modified class file data. 1020 // Copy modified class data to new resources array. 1021 if (_curr_data != *_data_ptr) { 1022 *_data_ptr = NEW_RESOURCE_ARRAY(u1, _curr_len); 1023 memcpy(*_data_ptr, _curr_data, _curr_len); 1024 *_end_ptr = *_data_ptr + _curr_len; 1025 _curr_env->Deallocate(_curr_data); 1026 } 1027 } 1028 }; 1029 1030 bool JvmtiExport::is_early_phase() { 1031 return JvmtiEnvBase::get_phase() <= JVMTI_PHASE_PRIMORDIAL; 1032 } 1033 1034 bool JvmtiExport::has_early_class_hook_env() { 1035 JvmtiEnvIterator it; 1036 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1037 if (env->early_class_hook_env()) { 1038 return true; 1039 } 1040 } 1041 return false; 1042 } 1043 1044 bool JvmtiExport::_should_post_class_file_load_hook = false; 1045 1046 // this entry is for class file load hook on class load, redefine and retransform 1047 bool JvmtiExport::post_class_file_load_hook(Symbol* h_name, 1048 Handle class_loader, 1049 Handle h_protection_domain, 1050 unsigned char **data_ptr, 1051 unsigned char **end_ptr, 1052 JvmtiCachedClassFileData **cache_ptr) { 1053 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1054 return false; 1055 } 1056 if (JavaThread::current()->is_in_tmp_VTMS_transition()) { 1057 return false; // skip CFLH events in tmp VTMS transition 1058 } 1059 1060 JvmtiClassFileLoadHookPoster poster(h_name, class_loader, 1061 h_protection_domain, 1062 data_ptr, end_ptr, 1063 cache_ptr); 1064 poster.post(); 1065 return poster.has_been_modified(); 1066 } 1067 1068 void JvmtiExport::report_unsupported(bool on) { 1069 // If any JVMTI service is turned on, we need to exit before native code 1070 // tries to access nonexistent services. 1071 if (on) { 1072 vm_exit_during_initialization("Java Kernel does not support JVMTI."); 1073 } 1074 } 1075 1076 1077 static inline Klass* oop_to_klass(oop obj) { 1078 Klass* k = obj->klass(); 1079 1080 // if the object is a java.lang.Class then return the java mirror 1081 if (k == vmClasses::Class_klass()) { 1082 if (!java_lang_Class::is_primitive(obj)) { 1083 k = java_lang_Class::as_Klass(obj); 1084 assert(k != NULL, "class for non-primitive mirror must exist"); 1085 } 1086 } 1087 return k; 1088 } 1089 1090 class JvmtiObjectAllocEventMark : public JvmtiClassEventMark { 1091 private: 1092 jobject _jobj; 1093 jlong _size; 1094 public: 1095 JvmtiObjectAllocEventMark(JavaThread *thread, oop obj) : JvmtiClassEventMark(thread, oop_to_klass(obj)) { 1096 _jobj = (jobject)to_jobject(obj); 1097 _size = obj->size() * wordSize; 1098 }; 1099 jobject jni_jobject() { return _jobj; } 1100 jlong size() { return _size; } 1101 }; 1102 1103 class JvmtiCompiledMethodLoadEventMark : public JvmtiMethodEventMark { 1104 private: 1105 jint _code_size; 1106 const void *_code_data; 1107 jint _map_length; 1108 jvmtiAddrLocationMap *_map; 1109 const void *_compile_info; 1110 public: 1111 JvmtiCompiledMethodLoadEventMark(JavaThread *thread, nmethod *nm, void* compile_info_ptr = NULL) 1112 : JvmtiMethodEventMark(thread,methodHandle(thread, nm->method())) { 1113 _code_data = nm->code_begin(); 1114 _code_size = nm->code_size(); 1115 _compile_info = compile_info_ptr; // Set void pointer of compiledMethodLoad Event. Default value is NULL. 1116 JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nm, &_map, &_map_length); 1117 } 1118 ~JvmtiCompiledMethodLoadEventMark() { 1119 FREE_C_HEAP_ARRAY(jvmtiAddrLocationMap, _map); 1120 } 1121 1122 jint code_size() { return _code_size; } 1123 const void *code_data() { return _code_data; } 1124 jint map_length() { return _map_length; } 1125 const jvmtiAddrLocationMap* map() { return _map; } 1126 const void *compile_info() { return _compile_info; } 1127 }; 1128 1129 1130 1131 class JvmtiMonitorEventMark : public JvmtiVirtualThreadEventMark { 1132 private: 1133 jobject _jobj; 1134 public: 1135 JvmtiMonitorEventMark(JavaThread *thread, oop object) 1136 : JvmtiVirtualThreadEventMark(thread){ 1137 _jobj = to_jobject(object); 1138 } 1139 jobject jni_object() { return _jobj; } 1140 }; 1141 1142 /////////////////////////////////////////////////////////////// 1143 // 1144 // pending CompiledMethodUnload support 1145 // 1146 1147 void JvmtiExport::post_compiled_method_unload( 1148 jmethodID method, const void *code_begin) { 1149 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1150 return; 1151 } 1152 JavaThread* thread = JavaThread::current(); 1153 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD, 1154 ("[%s] method compile unload event triggered", 1155 JvmtiTrace::safe_get_thread_name(thread))); 1156 1157 // post the event for each environment that has this event enabled. 1158 JvmtiEnvIterator it; 1159 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1160 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_UNLOAD)) { 1161 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1162 continue; 1163 } 1164 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD, 1165 ("[%s] class compile method unload event sent jmethodID " PTR_FORMAT, 1166 JvmtiTrace::safe_get_thread_name(thread), p2i(method))); 1167 1168 ResourceMark rm(thread); 1169 1170 JvmtiEventMark jem(thread); 1171 JvmtiJavaThreadEventTransition jet(thread); 1172 jvmtiEventCompiledMethodUnload callback = env->callbacks()->CompiledMethodUnload; 1173 if (callback != NULL) { 1174 (*callback)(env->jvmti_external(), method, code_begin); 1175 } 1176 } 1177 } 1178 } 1179 1180 /////////////////////////////////////////////////////////////// 1181 // 1182 // JvmtiExport 1183 // 1184 1185 void JvmtiExport::post_raw_breakpoint(JavaThread *thread, Method* method, address location) { 1186 HandleMark hm(thread); 1187 methodHandle mh(thread, method); 1188 1189 JvmtiThreadState *state = thread->jvmti_thread_state(); 1190 if (state == NULL) { 1191 return; 1192 } 1193 if (thread->is_in_any_VTMS_transition()) { 1194 return; // no events should be posted if thread is in any VTMS transition 1195 } 1196 1197 EVT_TRIG_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Trg Breakpoint triggered", 1198 JvmtiTrace::safe_get_thread_name(thread))); 1199 JvmtiEnvThreadStateIterator it(state); 1200 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1201 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_BREAKPOINT); 1202 if (!ets->breakpoint_posted() && ets->is_enabled(JVMTI_EVENT_BREAKPOINT)) { 1203 ThreadState old_os_state = thread->osthread()->get_state(); 1204 thread->osthread()->set_state(BREAKPOINTED); 1205 EVT_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Evt Breakpoint sent %s.%s @ " INTX_FORMAT, 1206 JvmtiTrace::safe_get_thread_name(thread), 1207 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1208 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1209 location - mh()->code_base() )); 1210 1211 JvmtiEnv *env = ets->get_env(); 1212 JvmtiLocationEventMark jem(thread, mh, location); 1213 JvmtiJavaThreadEventTransition jet(thread); 1214 jvmtiEventBreakpoint callback = env->callbacks()->Breakpoint; 1215 if (callback != NULL) { 1216 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1217 jem.jni_methodID(), jem.location()); 1218 } 1219 1220 ets->set_breakpoint_posted(); 1221 thread->osthread()->set_state(old_os_state); 1222 } 1223 } 1224 } 1225 1226 ////////////////////////////////////////////////////////////////////////////// 1227 1228 bool JvmtiExport::_can_get_source_debug_extension = false; 1229 bool JvmtiExport::_can_maintain_original_method_order = false; 1230 bool JvmtiExport::_can_post_interpreter_events = false; 1231 bool JvmtiExport::_can_post_on_exceptions = false; 1232 bool JvmtiExport::_can_post_breakpoint = false; 1233 bool JvmtiExport::_can_post_field_access = false; 1234 bool JvmtiExport::_can_post_field_modification = false; 1235 bool JvmtiExport::_can_post_method_entry = false; 1236 bool JvmtiExport::_can_post_method_exit = false; 1237 bool JvmtiExport::_can_post_frame_pop = false; 1238 bool JvmtiExport::_can_pop_frame = false; 1239 bool JvmtiExport::_can_force_early_return = false; 1240 bool JvmtiExport::_can_support_virtual_threads = false; 1241 bool JvmtiExport::_can_get_owned_monitor_info = false; 1242 1243 bool JvmtiExport::_early_vmstart_recorded = false; 1244 1245 bool JvmtiExport::_should_post_single_step = false; 1246 bool JvmtiExport::_should_post_field_access = false; 1247 bool JvmtiExport::_should_post_field_modification = false; 1248 bool JvmtiExport::_should_post_class_load = false; 1249 bool JvmtiExport::_should_post_class_prepare = false; 1250 bool JvmtiExport::_should_post_class_unload = false; 1251 bool JvmtiExport::_should_post_thread_life = false; 1252 bool JvmtiExport::_should_clean_up_heap_objects = false; 1253 bool JvmtiExport::_should_post_native_method_bind = false; 1254 bool JvmtiExport::_should_post_dynamic_code_generated = false; 1255 bool JvmtiExport::_should_post_data_dump = false; 1256 bool JvmtiExport::_should_post_compiled_method_load = false; 1257 bool JvmtiExport::_should_post_compiled_method_unload = false; 1258 bool JvmtiExport::_should_post_monitor_contended_enter = false; 1259 bool JvmtiExport::_should_post_monitor_contended_entered = false; 1260 bool JvmtiExport::_should_post_monitor_wait = false; 1261 bool JvmtiExport::_should_post_monitor_waited = false; 1262 bool JvmtiExport::_should_post_garbage_collection_start = false; 1263 bool JvmtiExport::_should_post_garbage_collection_finish = false; 1264 bool JvmtiExport::_should_post_object_free = false; 1265 bool JvmtiExport::_should_post_resource_exhausted = false; 1266 bool JvmtiExport::_should_post_vm_object_alloc = false; 1267 bool JvmtiExport::_should_post_sampled_object_alloc = false; 1268 bool JvmtiExport::_should_post_on_exceptions = false; 1269 bool JvmtiExport::_should_post_vthread_start = false; 1270 bool JvmtiExport::_should_post_vthread_end = false; 1271 bool JvmtiExport::_should_post_vthread_mount = false; 1272 bool JvmtiExport::_should_post_vthread_unmount = false; 1273 1274 //////////////////////////////////////////////////////////////////////////////////////////////// 1275 1276 1277 void JvmtiExport::check_vthread_and_suspend_at_safepoint(JavaThread *thread) { 1278 oop vt = thread->jvmti_vthread(); 1279 1280 if (vt != NULL && java_lang_VirtualThread::is_instance(vt)) { 1281 int64_t id = java_lang_Thread::thread_id(vt); 1282 1283 ThreadBlockInVM tbivm(thread); 1284 MonitorLocker ml(JvmtiVTMSTransition_lock, Mutex::_no_safepoint_check_flag); 1285 1286 // block while vthread is externally suspended 1287 while (JvmtiVTSuspender::is_vthread_suspended(id)) { 1288 ml.wait(); 1289 } 1290 } 1291 } 1292 1293 // 1294 // JVMTI single step management 1295 // 1296 void JvmtiExport::at_single_stepping_point(JavaThread *thread, Method* method, address location) { 1297 assert(JvmtiExport::should_post_single_step(), "must be single stepping"); 1298 1299 HandleMark hm(thread); 1300 methodHandle mh(thread, method); 1301 1302 // update information about current location and post a step event 1303 JvmtiThreadState *state = thread->jvmti_thread_state(); 1304 if (state == NULL) { 1305 return; 1306 } 1307 EVT_TRIG_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Trg Single Step triggered", 1308 JvmtiTrace::safe_get_thread_name(thread))); 1309 if (!state->hide_single_stepping()) { 1310 if (state->is_pending_step_for_popframe()) { 1311 state->process_pending_step_for_popframe(); 1312 } 1313 if (state->is_pending_step_for_earlyret()) { 1314 state->process_pending_step_for_earlyret(); 1315 } 1316 JvmtiExport::post_single_step(thread, mh(), location); 1317 } 1318 } 1319 1320 1321 void JvmtiExport::expose_single_stepping(JavaThread *thread) { 1322 JvmtiThreadState *state = thread->jvmti_thread_state(); 1323 if (state != NULL) { 1324 state->clear_hide_single_stepping(); 1325 } 1326 } 1327 1328 1329 bool JvmtiExport::hide_single_stepping(JavaThread *thread) { 1330 JvmtiThreadState *state = thread->jvmti_thread_state(); 1331 if (state != NULL && state->is_enabled(JVMTI_EVENT_SINGLE_STEP)) { 1332 state->set_hide_single_stepping(); 1333 return true; 1334 } else { 1335 return false; 1336 } 1337 } 1338 1339 void JvmtiExport::post_class_load(JavaThread *thread, Klass* klass) { 1340 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1341 return; 1342 } 1343 HandleMark hm(thread); 1344 1345 JvmtiThreadState* state = thread->jvmti_thread_state(); 1346 if (state == NULL) { 1347 return; 1348 } 1349 if (thread->is_in_tmp_VTMS_transition()) { 1350 return; // skip ClassLoad events in tmp VTMS transition 1351 } 1352 assert(!thread->is_in_any_VTMS_transition(), "class load events are not allowed in any VTMS transition"); 1353 1354 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Trg Class Load triggered", 1355 JvmtiTrace::safe_get_thread_name(thread))); 1356 JvmtiEnvThreadStateIterator it(state); 1357 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1358 if (ets->is_enabled(JVMTI_EVENT_CLASS_LOAD)) { 1359 JvmtiEnv *env = ets->get_env(); 1360 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1361 continue; 1362 } 1363 EVT_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Evt Class Load sent %s", 1364 JvmtiTrace::safe_get_thread_name(thread), 1365 klass==NULL? "NULL" : klass->external_name() )); 1366 JvmtiClassEventMark jem(thread, klass); 1367 JvmtiJavaThreadEventTransition jet(thread); 1368 jvmtiEventClassLoad callback = env->callbacks()->ClassLoad; 1369 if (callback != NULL) { 1370 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class()); 1371 } 1372 } 1373 } 1374 } 1375 1376 1377 void JvmtiExport::post_class_prepare(JavaThread *thread, Klass* klass) { 1378 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1379 return; 1380 } 1381 HandleMark hm(thread); 1382 1383 JvmtiThreadState* state = thread->jvmti_thread_state(); 1384 if (state == NULL) { 1385 return; 1386 } 1387 if (thread->is_in_tmp_VTMS_transition()) { 1388 return; // skip ClassPrepare events in tmp VTMS transition 1389 } 1390 assert(!thread->is_in_any_VTMS_transition(), "class prepare events are not allowed in any VTMS transition"); 1391 1392 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Trg Class Prepare triggered", 1393 JvmtiTrace::safe_get_thread_name(thread))); 1394 JvmtiEnvThreadStateIterator it(state); 1395 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1396 if (ets->is_enabled(JVMTI_EVENT_CLASS_PREPARE)) { 1397 JvmtiEnv *env = ets->get_env(); 1398 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1399 continue; 1400 } 1401 EVT_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Evt Class Prepare sent %s", 1402 JvmtiTrace::safe_get_thread_name(thread), 1403 klass==NULL? "NULL" : klass->external_name() )); 1404 JvmtiClassEventMark jem(thread, klass); 1405 JvmtiJavaThreadEventTransition jet(thread); 1406 jvmtiEventClassPrepare callback = env->callbacks()->ClassPrepare; 1407 if (callback != NULL) { 1408 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class()); 1409 } 1410 } 1411 } 1412 } 1413 1414 void JvmtiExport::post_class_unload(Klass* klass) { 1415 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1416 return; 1417 } 1418 1419 // postings to the service thread so that it can perform them in a safe 1420 // context and in-order. 1421 ResourceMark rm; 1422 // JvmtiDeferredEvent copies the string. 1423 JvmtiDeferredEvent event = JvmtiDeferredEvent::class_unload_event(klass->name()->as_C_string()); 1424 ServiceThread::enqueue_deferred_event(&event); 1425 } 1426 1427 1428 void JvmtiExport::post_class_unload_internal(const char* name) { 1429 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1430 return; 1431 } 1432 assert(Thread::current()->is_service_thread(), "must be called from ServiceThread"); 1433 JavaThread *thread = JavaThread::current(); 1434 HandleMark hm(thread); 1435 1436 EVT_TRIG_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Trg Class Unload triggered" )); 1437 if (JvmtiEventController::is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) { 1438 1439 JvmtiEnvIterator it; 1440 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1441 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1442 continue; 1443 } 1444 if (env->is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) { 1445 EVT_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Evt Class Unload sent %s", name)); 1446 1447 JvmtiEventMark jem(thread); 1448 JvmtiJavaThreadEventTransition jet(thread); 1449 jvmtiExtensionEvent callback = env->ext_callbacks()->ClassUnload; 1450 if (callback != NULL) { 1451 (*callback)(env->jvmti_external(), jem.jni_env(), name); 1452 } 1453 } 1454 } 1455 } 1456 } 1457 1458 1459 void JvmtiExport::post_thread_start(JavaThread *thread) { 1460 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1461 return; 1462 } 1463 assert(thread->thread_state() == _thread_in_vm, "must be in vm state"); 1464 1465 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Trg Thread Start event triggered", 1466 JvmtiTrace::safe_get_thread_name(thread))); 1467 1468 // do JVMTI thread initialization (if needed) 1469 JvmtiEventController::thread_started(thread); 1470 1471 // Do not post thread start event for hidden java thread. 1472 if (JvmtiEventController::is_enabled(JVMTI_EVENT_THREAD_START) && 1473 !thread->is_hidden_from_external_view()) { 1474 JvmtiEnvIterator it; 1475 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1476 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1477 continue; 1478 } 1479 if (env->is_enabled(JVMTI_EVENT_THREAD_START)) { 1480 EVT_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Evt Thread Start event sent", 1481 JvmtiTrace::safe_get_thread_name(thread) )); 1482 1483 JvmtiVirtualThreadEventMark jem(thread); 1484 JvmtiJavaThreadEventTransition jet(thread); 1485 jvmtiEventThreadStart callback = env->callbacks()->ThreadStart; 1486 if (callback != NULL) { 1487 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread()); 1488 } 1489 } 1490 } 1491 } 1492 } 1493 1494 1495 void JvmtiExport::post_thread_end(JavaThread *thread) { 1496 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1497 return; 1498 } 1499 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Trg Thread End event triggered", 1500 JvmtiTrace::safe_get_thread_name(thread))); 1501 1502 JvmtiThreadState *state = thread->jvmti_thread_state(); 1503 if (state == NULL) { 1504 return; 1505 } 1506 1507 // Do not post thread end event for hidden java thread. 1508 if (state->is_enabled(JVMTI_EVENT_THREAD_END) && 1509 !thread->is_hidden_from_external_view()) { 1510 1511 JvmtiEnvThreadStateIterator it(state); 1512 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1513 if (ets->is_enabled(JVMTI_EVENT_THREAD_END)) { 1514 JvmtiEnv *env = ets->get_env(); 1515 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1516 continue; 1517 } 1518 EVT_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Evt Thread End event sent", 1519 JvmtiTrace::safe_get_thread_name(thread) )); 1520 1521 JvmtiVirtualThreadEventMark jem(thread); 1522 JvmtiJavaThreadEventTransition jet(thread); 1523 jvmtiEventThreadEnd callback = env->callbacks()->ThreadEnd; 1524 if (callback != NULL) { 1525 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread()); 1526 } 1527 } 1528 } 1529 } 1530 } 1531 1532 1533 void JvmtiExport::post_vthread_start(jobject vthread) { 1534 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1535 return; 1536 } 1537 EVT_TRIG_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_START, ("[%p] Trg Virtual Thread Start event triggered", vthread)); 1538 1539 JavaThread *cur_thread = JavaThread::current(); 1540 JvmtiThreadState *state = cur_thread->jvmti_thread_state(); 1541 if (state == NULL) { 1542 return; 1543 } 1544 1545 if (state->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_START)) { 1546 JvmtiEnvThreadStateIterator it(state); 1547 1548 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1549 JvmtiEnv *env = ets->get_env(); 1550 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1551 continue; 1552 } 1553 if (ets->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_START)) { 1554 EVT_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_START, ("[%p] Evt Virtual Thread Start event sent", vthread)); 1555 1556 JvmtiVirtualThreadEventMark jem(cur_thread); 1557 JvmtiJavaThreadEventTransition jet(cur_thread); 1558 jvmtiEventVirtualThreadStart callback = env->callbacks()->VirtualThreadStart; 1559 if (callback != NULL) { 1560 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread()); 1561 } 1562 } 1563 } 1564 } 1565 } 1566 1567 void JvmtiExport::post_vthread_end(jobject vthread) { 1568 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1569 return; 1570 } 1571 EVT_TRIG_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_END, ("[%p] Trg Virtual Thread End event triggered", vthread)); 1572 1573 JavaThread *cur_thread = JavaThread::current(); 1574 JvmtiThreadState *state = cur_thread->jvmti_thread_state(); 1575 if (state == NULL) { 1576 return; 1577 } 1578 1579 if (state->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_END)) { 1580 JvmtiEnvThreadStateIterator it(state); 1581 1582 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1583 JvmtiEnv *env = ets->get_env(); 1584 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1585 continue; 1586 } 1587 if (ets->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_END)) { 1588 EVT_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_END, ("[%p] Evt Virtual Thread End event sent", vthread)); 1589 1590 JvmtiVirtualThreadEventMark jem(cur_thread); 1591 JvmtiJavaThreadEventTransition jet(cur_thread); 1592 jvmtiEventVirtualThreadEnd callback = env->callbacks()->VirtualThreadEnd; 1593 if (callback != NULL) { 1594 (*callback)(env->jvmti_external(), jem.jni_env(), vthread); 1595 } 1596 } 1597 } 1598 } 1599 } 1600 1601 void JvmtiExport::post_vthread_mount(jobject vthread) { 1602 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1603 return; 1604 } 1605 JavaThread *thread = JavaThread::current(); 1606 HandleMark hm(thread); 1607 EVT_TRIG_TRACE(EXT_EVENT_VIRTUAL_THREAD_MOUNT, ("[%p] Trg Virtual Thread Mount event triggered", vthread)); 1608 1609 JvmtiThreadState *state = thread->jvmti_thread_state(); 1610 if (state == NULL) { 1611 return; 1612 } 1613 1614 if (state->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_MOUNT)) { 1615 JvmtiEnvThreadStateIterator it(state); 1616 1617 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1618 JvmtiEnv *env = ets->get_env(); 1619 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1620 continue; 1621 } 1622 if (ets->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_MOUNT)) { 1623 EVT_TRACE(EXT_EVENT_VIRTUAL_THREAD_MOUNT, ("[%p] Evt Virtual Thread Mount event sent", vthread)); 1624 1625 JvmtiVirtualThreadEventMark jem(thread); 1626 JvmtiJavaThreadEventTransition jet(thread); 1627 jvmtiExtensionEvent callback = env->ext_callbacks()->VirtualThreadMount; 1628 if (callback != NULL) { 1629 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread()); 1630 } 1631 } 1632 } 1633 } 1634 } 1635 1636 void JvmtiExport::post_vthread_unmount(jobject vthread) { 1637 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1638 return; 1639 } 1640 JavaThread *thread = JavaThread::current(); 1641 HandleMark hm(thread); 1642 EVT_TRIG_TRACE(EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, ("[%p] Trg Virtual Thread Unmount event triggered", vthread)); 1643 1644 JvmtiThreadState *state = thread->jvmti_thread_state(); 1645 if (state == NULL) { 1646 return; 1647 } 1648 1649 if (state->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_UNMOUNT)) { 1650 JvmtiEnvThreadStateIterator it(state); 1651 1652 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1653 JvmtiEnv *env = ets->get_env(); 1654 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1655 continue; 1656 } 1657 if (ets->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_UNMOUNT)) { 1658 EVT_TRACE(EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, ("[%p] Evt Virtual Thread Unmount event sent", vthread)); 1659 1660 JvmtiVirtualThreadEventMark jem(thread); 1661 JvmtiJavaThreadEventTransition jet(thread); 1662 jvmtiExtensionEvent callback = env->ext_callbacks()->VirtualThreadUnmount; 1663 if (callback != NULL) { 1664 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread()); 1665 } 1666 } 1667 } 1668 } 1669 } 1670 1671 void JvmtiExport::continuation_yield_cleanup(JavaThread* thread, jint continuation_frame_count) { 1672 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1673 return; 1674 } 1675 1676 assert(thread == JavaThread::current(), "must be"); 1677 JvmtiThreadState *state = thread->jvmti_thread_state(); 1678 if (state == NULL) { 1679 return; 1680 } 1681 state->invalidate_cur_stack_depth(); 1682 1683 // Clear frame_pop requests in frames popped by yield 1684 if (can_post_frame_pop()) { 1685 JvmtiEnvThreadStateIterator it(state); 1686 int top_frame_num = state->cur_stack_depth() + continuation_frame_count; 1687 1688 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1689 if (!ets->has_frame_pops()) { 1690 continue; 1691 } 1692 for (int frame_idx = 0; frame_idx < continuation_frame_count; frame_idx++) { 1693 int frame_num = top_frame_num - frame_idx; 1694 1695 if (!state->is_virtual() && ets->is_frame_pop(frame_num)) { 1696 // remove the frame's entry 1697 MutexLocker mu(JvmtiThreadState_lock); 1698 ets->clear_frame_pop(frame_num); 1699 } 1700 } 1701 } 1702 } 1703 } 1704 1705 void JvmtiExport::post_object_free(JvmtiEnv* env, GrowableArray<jlong>* objects) { 1706 assert(objects != NULL, "Nothing to post"); 1707 1708 JavaThread *javaThread = JavaThread::current(); 1709 if (javaThread->is_in_any_VTMS_transition()) { 1710 return; // no events should be posted if thread is in any VTMS transition 1711 } 1712 if (!env->is_enabled(JVMTI_EVENT_OBJECT_FREE)) { 1713 return; // the event type has been already disabled 1714 } 1715 1716 EVT_TRIG_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Trg Object Free triggered" )); 1717 EVT_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Evt Object Free sent")); 1718 1719 JvmtiThreadEventMark jem(javaThread); 1720 JvmtiJavaThreadEventTransition jet(javaThread); 1721 jvmtiEventObjectFree callback = env->callbacks()->ObjectFree; 1722 if (callback != NULL) { 1723 for (int index = 0; index < objects->length(); index++) { 1724 (*callback)(env->jvmti_external(), objects->at(index)); 1725 } 1726 } 1727 } 1728 1729 void JvmtiExport::post_resource_exhausted(jint resource_exhausted_flags, const char* description) { 1730 1731 JavaThread *thread = JavaThread::current(); 1732 1733 if (thread->is_in_any_VTMS_transition()) { 1734 return; // no events should be posted if thread is in any VTMS transition 1735 } 1736 1737 log_error(jvmti)("Posting Resource Exhausted event: %s", 1738 description != nullptr ? description : "unknown"); 1739 1740 // JDK-8213834: handlers of ResourceExhausted may attempt some analysis 1741 // which often requires running java. 1742 // This will cause problems on threads not able to run java, e.g. compiler 1743 // threads. To forestall these problems, we therefore suppress sending this 1744 // event from threads which are not able to run java. 1745 if (!thread->can_call_java()) { 1746 return; 1747 } 1748 1749 EVT_TRIG_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Trg resource exhausted event triggered" )); 1750 1751 JvmtiEnvIterator it; 1752 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1753 if (env->is_enabled(JVMTI_EVENT_RESOURCE_EXHAUSTED)) { 1754 EVT_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Evt resource exhausted event sent" )); 1755 1756 JvmtiThreadEventMark jem(thread); 1757 JvmtiJavaThreadEventTransition jet(thread); 1758 jvmtiEventResourceExhausted callback = env->callbacks()->ResourceExhausted; 1759 if (callback != NULL) { 1760 (*callback)(env->jvmti_external(), jem.jni_env(), 1761 resource_exhausted_flags, NULL, description); 1762 } 1763 } 1764 } 1765 } 1766 1767 void JvmtiExport::post_method_entry(JavaThread *thread, Method* method, frame current_frame) { 1768 HandleMark hm(thread); 1769 methodHandle mh(thread, method); 1770 1771 JvmtiThreadState* state = thread->jvmti_thread_state(); 1772 if (state == NULL || !state->is_interp_only_mode()) { 1773 // for any thread that actually wants method entry, interp_only_mode is set 1774 return; 1775 } 1776 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) { 1777 return; // no events should be posted if thread is in any VTMS transition 1778 } 1779 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Trg Method Entry triggered %s.%s", 1780 JvmtiTrace::safe_get_thread_name(thread), 1781 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1782 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1783 1784 state->incr_cur_stack_depth(); 1785 1786 if (state->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) { 1787 JvmtiEnvThreadStateIterator it(state); 1788 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1789 if (ets->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) { 1790 EVT_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Evt Method Entry sent %s.%s", 1791 JvmtiTrace::safe_get_thread_name(thread), 1792 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1793 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1794 1795 JvmtiEnv *env = ets->get_env(); 1796 JvmtiMethodEventMark jem(thread, mh); 1797 JvmtiJavaThreadEventTransition jet(thread); 1798 jvmtiEventMethodEntry callback = env->callbacks()->MethodEntry; 1799 if (callback != NULL) { 1800 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_methodID()); 1801 } 1802 } 1803 } 1804 } 1805 } 1806 1807 void JvmtiExport::post_method_exit(JavaThread* thread, Method* method, frame current_frame) { 1808 HandleMark hm(thread); 1809 methodHandle mh(thread, method); 1810 1811 JvmtiThreadState *state = thread->jvmti_thread_state(); 1812 1813 if (state == NULL || !state->is_interp_only_mode()) { 1814 // for any thread that actually wants method exit, interp_only_mode is set 1815 return; 1816 } 1817 1818 // return a flag when a method terminates by throwing an exception 1819 // i.e. if an exception is thrown and it's not caught by the current method 1820 bool exception_exit = state->is_exception_detected() && !state->is_exception_caught(); 1821 Handle result; 1822 jvalue value; 1823 value.j = 0L; 1824 1825 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) { 1826 // if the method hasn't been popped because of an exception then we populate 1827 // the return_value parameter for the callback. At this point we only have 1828 // the address of a "raw result" and we just call into the interpreter to 1829 // convert this into a jvalue. 1830 if (!exception_exit) { 1831 oop oop_result; 1832 BasicType type = current_frame.interpreter_frame_result(&oop_result, &value); 1833 if (is_reference_type(type)) { 1834 result = Handle(thread, oop_result); 1835 value.l = JNIHandles::make_local(thread, result()); 1836 } 1837 } 1838 } 1839 1840 // Deferred transition to VM, so we can stash away the return oop before GC 1841 // Note that this transition is not needed when throwing an exception, because 1842 // there is no oop to retain. 1843 JavaThread* current = thread; // for JRT_BLOCK 1844 JRT_BLOCK 1845 post_method_exit_inner(thread, mh, state, exception_exit, current_frame, value); 1846 JRT_BLOCK_END 1847 1848 if (result.not_null() && !mh->is_native()) { 1849 // We have to restore the oop on the stack for interpreter frames 1850 *(oop*)current_frame.interpreter_frame_tos_address() = result(); 1851 } 1852 } 1853 1854 void JvmtiExport::post_method_exit_inner(JavaThread* thread, 1855 methodHandle& mh, 1856 JvmtiThreadState *state, 1857 bool exception_exit, 1858 frame current_frame, 1859 jvalue& value) { 1860 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) { 1861 return; // no events should be posted if thread is in any VTMS transition 1862 } 1863 1864 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Trg Method Exit triggered %s.%s", 1865 JvmtiTrace::safe_get_thread_name(thread), 1866 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1867 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1868 1869 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) { 1870 JvmtiEnvThreadStateIterator it(state); 1871 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1872 if (ets->is_enabled(JVMTI_EVENT_METHOD_EXIT)) { 1873 EVT_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Evt Method Exit sent %s.%s", 1874 JvmtiTrace::safe_get_thread_name(thread), 1875 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1876 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1877 1878 JvmtiEnv *env = ets->get_env(); 1879 JvmtiMethodEventMark jem(thread, mh); 1880 JvmtiJavaThreadEventTransition jet(thread); 1881 jvmtiEventMethodExit callback = env->callbacks()->MethodExit; 1882 if (callback != NULL) { 1883 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1884 jem.jni_methodID(), exception_exit, value); 1885 } 1886 } 1887 } 1888 } 1889 1890 JvmtiEnvThreadStateIterator it(state); 1891 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1892 if (ets->has_frame_pops()) { 1893 int cur_frame_number = state->cur_stack_depth(); 1894 1895 if (ets->is_frame_pop(cur_frame_number)) { 1896 // we have a NotifyFramePop entry for this frame. 1897 // now check that this env/thread wants this event 1898 if (ets->is_enabled(JVMTI_EVENT_FRAME_POP)) { 1899 EVT_TRACE(JVMTI_EVENT_FRAME_POP, ("[%s] Evt Frame Pop sent %s.%s", 1900 JvmtiTrace::safe_get_thread_name(thread), 1901 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1902 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1903 1904 // we also need to issue a frame pop event for this frame 1905 JvmtiEnv *env = ets->get_env(); 1906 JvmtiMethodEventMark jem(thread, mh); 1907 JvmtiJavaThreadEventTransition jet(thread); 1908 jvmtiEventFramePop callback = env->callbacks()->FramePop; 1909 if (callback != NULL) { 1910 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1911 jem.jni_methodID(), exception_exit); 1912 } 1913 } 1914 // remove the frame's entry 1915 { 1916 MutexLocker mu(JvmtiThreadState_lock); 1917 ets->clear_frame_pop(cur_frame_number); 1918 } 1919 } 1920 } 1921 } 1922 1923 state->decr_cur_stack_depth(); 1924 } 1925 1926 1927 // Todo: inline this for optimization 1928 void JvmtiExport::post_single_step(JavaThread *thread, Method* method, address location) { 1929 HandleMark hm(thread); 1930 methodHandle mh(thread, method); 1931 1932 JvmtiThreadState *state = thread->jvmti_thread_state(); 1933 if (state == NULL) { 1934 return; 1935 } 1936 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) { 1937 return; // no events should be posted if thread is in any VTMS transition 1938 } 1939 1940 JvmtiEnvThreadStateIterator it(state); 1941 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1942 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_SINGLE_STEP); 1943 if (!ets->single_stepping_posted() && ets->is_enabled(JVMTI_EVENT_SINGLE_STEP)) { 1944 EVT_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Evt Single Step sent %s.%s @ " INTX_FORMAT, 1945 JvmtiTrace::safe_get_thread_name(thread), 1946 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1947 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1948 location - mh()->code_base() )); 1949 1950 JvmtiEnv *env = ets->get_env(); 1951 JvmtiLocationEventMark jem(thread, mh, location); 1952 JvmtiJavaThreadEventTransition jet(thread); 1953 jvmtiEventSingleStep callback = env->callbacks()->SingleStep; 1954 if (callback != NULL) { 1955 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1956 jem.jni_methodID(), jem.location()); 1957 } 1958 1959 ets->set_single_stepping_posted(); 1960 } 1961 } 1962 } 1963 1964 void JvmtiExport::post_exception_throw(JavaThread *thread, Method* method, address location, oop exception) { 1965 HandleMark hm(thread); 1966 methodHandle mh(thread, method); 1967 Handle exception_handle(thread, exception); 1968 // The KeepStackGCProcessedMark below keeps the target thread and its stack fully 1969 // GC processed across this scope. This is needed because there is a stack walk 1970 // below with safepoint polls inside of it. After such safepoints, we have to 1971 // ensure the stack is sufficiently processed. 1972 KeepStackGCProcessedMark ksgcpm(thread); 1973 1974 JvmtiThreadState *state = thread->jvmti_thread_state(); 1975 if (state == NULL) { 1976 return; 1977 } 1978 if (thread->is_in_any_VTMS_transition()) { 1979 return; // no events should be posted if thread is in any VTMS transition 1980 } 1981 1982 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION, ("[%s] Trg Exception thrown triggered", 1983 JvmtiTrace::safe_get_thread_name(thread))); 1984 if (!state->is_exception_detected()) { 1985 state->set_exception_detected(); 1986 JvmtiEnvThreadStateIterator it(state); 1987 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1988 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION) && (exception != NULL)) { 1989 1990 EVT_TRACE(JVMTI_EVENT_EXCEPTION, 1991 ("[%s] Evt Exception thrown sent %s.%s @ " INTX_FORMAT, 1992 JvmtiTrace::safe_get_thread_name(thread), 1993 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1994 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1995 location - mh()->code_base() )); 1996 1997 JvmtiEnv *env = ets->get_env(); 1998 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle); 1999 2000 // It's okay to clear these exceptions here because we duplicate 2001 // this lookup in InterpreterRuntime::exception_handler_for_exception. 2002 EXCEPTION_MARK; 2003 2004 bool should_repeat; 2005 vframeStream st(thread); 2006 assert(!st.at_end(), "cannot be at end"); 2007 Method* current_method = NULL; 2008 // A GC may occur during the Method::fast_exception_handler_bci_for() 2009 // call below if it needs to load the constraint class. Using a 2010 // methodHandle to keep the 'current_method' from being deallocated 2011 // if GC happens. 2012 methodHandle current_mh = methodHandle(thread, current_method); 2013 int current_bci = -1; 2014 do { 2015 current_method = st.method(); 2016 current_mh = methodHandle(thread, current_method); 2017 current_bci = st.bci(); 2018 do { 2019 should_repeat = false; 2020 Klass* eh_klass = exception_handle()->klass(); 2021 current_bci = Method::fast_exception_handler_bci_for( 2022 current_mh, eh_klass, current_bci, THREAD); 2023 if (HAS_PENDING_EXCEPTION) { 2024 exception_handle = Handle(thread, PENDING_EXCEPTION); 2025 CLEAR_PENDING_EXCEPTION; 2026 should_repeat = true; 2027 } 2028 } while (should_repeat && (current_bci != -1)); 2029 st.next(); 2030 } while ((current_bci < 0) && (!st.at_end())); 2031 2032 jmethodID catch_jmethodID; 2033 if (current_bci < 0) { 2034 catch_jmethodID = 0; 2035 current_bci = 0; 2036 } else { 2037 catch_jmethodID = jem.to_jmethodID(current_mh); 2038 } 2039 2040 JvmtiJavaThreadEventTransition jet(thread); 2041 jvmtiEventException callback = env->callbacks()->Exception; 2042 if (callback != NULL) { 2043 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 2044 jem.jni_methodID(), jem.location(), 2045 jem.exception(), 2046 catch_jmethodID, current_bci); 2047 } 2048 } 2049 } 2050 } 2051 2052 // frames may get popped because of this throw, be safe - invalidate cached depth 2053 state->invalidate_cur_stack_depth(); 2054 } 2055 2056 2057 void JvmtiExport::notice_unwind_due_to_exception(JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) { 2058 HandleMark hm(thread); 2059 methodHandle mh(thread, method); 2060 Handle exception_handle(thread, exception); 2061 2062 JvmtiThreadState *state = thread->jvmti_thread_state(); 2063 if (state == NULL) { 2064 return; 2065 } 2066 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION_CATCH, 2067 ("[%s] Trg unwind_due_to_exception triggered %s.%s @ %s" INTX_FORMAT " - %s", 2068 JvmtiTrace::safe_get_thread_name(thread), 2069 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 2070 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 2071 location==0? "no location:" : "", 2072 location==0? 0 : location - mh()->code_base(), 2073 in_handler_frame? "in handler frame" : "not handler frame" )); 2074 2075 if (state->is_exception_detected()) { 2076 2077 state->invalidate_cur_stack_depth(); 2078 if (!in_handler_frame) { 2079 // Not in exception handler. 2080 if(state->is_interp_only_mode()) { 2081 // method exit and frame pop events are posted only in interp mode. 2082 // When these events are enabled code should be in running in interp mode. 2083 jvalue no_value; 2084 no_value.j = 0L; 2085 JvmtiExport::post_method_exit_inner(thread, mh, state, true, thread->last_frame(), no_value); 2086 // The cached cur_stack_depth might have changed from the 2087 // operations of frame pop or method exit. We are not 100% sure 2088 // the cached cur_stack_depth is still valid depth so invalidate 2089 // it. 2090 state->invalidate_cur_stack_depth(); 2091 } 2092 } else { 2093 // In exception handler frame. Report exception catch. 2094 assert(location != NULL, "must be a known location"); 2095 // Update cur_stack_depth - the frames above the current frame 2096 // have been unwound due to this exception: 2097 assert(!state->is_exception_caught(), "exception must not be caught yet."); 2098 state->set_exception_caught(); 2099 2100 if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) { 2101 return; // no events should be posted if thread is in any VTMS transition 2102 } 2103 JvmtiEnvThreadStateIterator it(state); 2104 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2105 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION_CATCH) && (exception_handle() != NULL)) { 2106 EVT_TRACE(JVMTI_EVENT_EXCEPTION_CATCH, 2107 ("[%s] Evt ExceptionCatch sent %s.%s @ " INTX_FORMAT, 2108 JvmtiTrace::safe_get_thread_name(thread), 2109 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 2110 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 2111 location - mh()->code_base() )); 2112 2113 JvmtiEnv *env = ets->get_env(); 2114 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle); 2115 JvmtiJavaThreadEventTransition jet(thread); 2116 jvmtiEventExceptionCatch callback = env->callbacks()->ExceptionCatch; 2117 if (callback != NULL) { 2118 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 2119 jem.jni_methodID(), jem.location(), 2120 jem.exception()); 2121 } 2122 } 2123 } 2124 } 2125 } 2126 } 2127 2128 oop JvmtiExport::jni_GetField_probe(JavaThread *thread, jobject jobj, oop obj, 2129 Klass* klass, jfieldID fieldID, bool is_static) { 2130 if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) { 2131 // At least one field access watch is set so we have more work to do. 2132 post_field_access_by_jni(thread, obj, klass, fieldID, is_static); 2133 // event posting can block so refetch oop if we were passed a jobj 2134 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj); 2135 } 2136 return obj; 2137 } 2138 2139 void JvmtiExport::post_field_access_by_jni(JavaThread *thread, oop obj, 2140 Klass* klass, jfieldID fieldID, bool is_static) { 2141 // We must be called with a Java context in order to provide reasonable 2142 // values for the klazz, method, and location fields. The callers of this 2143 // function don't make the call unless there is a Java context. 2144 assert(thread->has_last_Java_frame(), "must be called with a Java context"); 2145 2146 if (thread->is_in_any_VTMS_transition()) { 2147 return; // no events should be posted if thread is in any VTMS transition 2148 } 2149 2150 ResourceMark rm; 2151 fieldDescriptor fd; 2152 // if get_field_descriptor finds fieldID to be invalid, then we just bail 2153 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd); 2154 assert(valid_fieldID == true,"post_field_access_by_jni called with invalid fieldID"); 2155 if (!valid_fieldID) return; 2156 // field accesses are not watched so bail 2157 if (!fd.is_field_access_watched()) return; 2158 2159 HandleMark hm(thread); 2160 Handle h_obj; 2161 if (!is_static) { 2162 // non-static field accessors have an object, but we need a handle 2163 assert(obj != NULL, "non-static needs an object"); 2164 h_obj = Handle(thread, obj); 2165 } 2166 post_field_access(thread, 2167 thread->last_frame().interpreter_frame_method(), 2168 thread->last_frame().interpreter_frame_bcp(), 2169 klass, h_obj, fieldID); 2170 } 2171 2172 void JvmtiExport::post_field_access(JavaThread *thread, Method* method, 2173 address location, Klass* field_klass, Handle object, jfieldID field) { 2174 2175 HandleMark hm(thread); 2176 methodHandle mh(thread, method); 2177 2178 JvmtiThreadState *state = thread->jvmti_thread_state(); 2179 if (state == NULL) { 2180 return; 2181 } 2182 if (thread->is_in_any_VTMS_transition()) { 2183 return; // no events should be posted if thread is in any VTMS transition 2184 } 2185 2186 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Trg Field Access event triggered", 2187 JvmtiTrace::safe_get_thread_name(thread))); 2188 JvmtiEnvThreadStateIterator it(state); 2189 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2190 if (ets->is_enabled(JVMTI_EVENT_FIELD_ACCESS)) { 2191 EVT_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Evt Field Access event sent %s.%s @ " INTX_FORMAT, 2192 JvmtiTrace::safe_get_thread_name(thread), 2193 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 2194 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 2195 location - mh()->code_base() )); 2196 2197 JvmtiEnv *env = ets->get_env(); 2198 JvmtiLocationEventMark jem(thread, mh, location); 2199 jclass field_jclass = jem.to_jclass(field_klass); 2200 jobject field_jobject = jem.to_jobject(object()); 2201 JvmtiJavaThreadEventTransition jet(thread); 2202 jvmtiEventFieldAccess callback = env->callbacks()->FieldAccess; 2203 if (callback != NULL) { 2204 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 2205 jem.jni_methodID(), jem.location(), 2206 field_jclass, field_jobject, field); 2207 } 2208 } 2209 } 2210 } 2211 2212 oop JvmtiExport::jni_SetField_probe(JavaThread *thread, jobject jobj, oop obj, 2213 Klass* klass, jfieldID fieldID, bool is_static, 2214 char sig_type, jvalue *value) { 2215 if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) { 2216 // At least one field modification watch is set so we have more work to do. 2217 post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value); 2218 // event posting can block so refetch oop if we were passed a jobj 2219 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj); 2220 } 2221 return obj; 2222 } 2223 2224 void JvmtiExport::post_field_modification_by_jni(JavaThread *thread, oop obj, 2225 Klass* klass, jfieldID fieldID, bool is_static, 2226 char sig_type, jvalue *value) { 2227 // We must be called with a Java context in order to provide reasonable 2228 // values for the klazz, method, and location fields. The callers of this 2229 // function don't make the call unless there is a Java context. 2230 assert(thread->has_last_Java_frame(), "must be called with Java context"); 2231 2232 if (thread->is_in_any_VTMS_transition()) { 2233 return; // no events should be posted if thread is in any VTMS transition 2234 } 2235 2236 ResourceMark rm; 2237 fieldDescriptor fd; 2238 // if get_field_descriptor finds fieldID to be invalid, then we just bail 2239 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd); 2240 assert(valid_fieldID == true,"post_field_modification_by_jni called with invalid fieldID"); 2241 if (!valid_fieldID) return; 2242 // field modifications are not watched so bail 2243 if (!fd.is_field_modification_watched()) return; 2244 2245 HandleMark hm(thread); 2246 2247 Handle h_obj; 2248 if (!is_static) { 2249 // non-static field accessors have an object, but we need a handle 2250 assert(obj != NULL, "non-static needs an object"); 2251 h_obj = Handle(thread, obj); 2252 } 2253 post_field_modification(thread, 2254 thread->last_frame().interpreter_frame_method(), 2255 thread->last_frame().interpreter_frame_bcp(), 2256 klass, h_obj, fieldID, sig_type, value); 2257 } 2258 2259 void JvmtiExport::post_raw_field_modification(JavaThread *thread, Method* method, 2260 address location, Klass* field_klass, Handle object, jfieldID field, 2261 char sig_type, jvalue *value) { 2262 2263 if (thread->is_in_any_VTMS_transition()) { 2264 return; // no events should be posted if thread is in any VTMS transition 2265 } 2266 2267 if (sig_type == JVM_SIGNATURE_INT || sig_type == JVM_SIGNATURE_BOOLEAN || 2268 sig_type == JVM_SIGNATURE_BYTE || sig_type == JVM_SIGNATURE_CHAR || 2269 sig_type == JVM_SIGNATURE_SHORT) { 2270 // 'I' instructions are used for byte, char, short and int. 2271 // determine which it really is, and convert 2272 fieldDescriptor fd; 2273 bool found = JvmtiEnv::get_field_descriptor(field_klass, field, &fd); 2274 // should be found (if not, leave as is) 2275 if (found) { 2276 jint ival = value->i; 2277 // convert value from int to appropriate type 2278 switch (fd.field_type()) { 2279 case T_BOOLEAN: 2280 sig_type = JVM_SIGNATURE_BOOLEAN; 2281 value->i = 0; // clear it 2282 value->z = (jboolean)ival; 2283 break; 2284 case T_BYTE: 2285 sig_type = JVM_SIGNATURE_BYTE; 2286 value->i = 0; // clear it 2287 value->b = (jbyte)ival; 2288 break; 2289 case T_CHAR: 2290 sig_type = JVM_SIGNATURE_CHAR; 2291 value->i = 0; // clear it 2292 value->c = (jchar)ival; 2293 break; 2294 case T_SHORT: 2295 sig_type = JVM_SIGNATURE_SHORT; 2296 value->i = 0; // clear it 2297 value->s = (jshort)ival; 2298 break; 2299 case T_INT: 2300 // nothing to do 2301 break; 2302 default: 2303 // this is an integer instruction, should be one of above 2304 ShouldNotReachHere(); 2305 break; 2306 } 2307 } 2308 } 2309 2310 assert(sig_type != JVM_SIGNATURE_ARRAY, "array should have sig_type == 'L'"); 2311 bool handle_created = false; 2312 2313 // convert oop to JNI handle. 2314 if (sig_type == JVM_SIGNATURE_CLASS || sig_type == JVM_SIGNATURE_PRIMITIVE_OBJECT) { 2315 handle_created = true; 2316 value->l = (jobject)JNIHandles::make_local(thread, cast_to_oop(value->l)); 2317 } 2318 2319 post_field_modification(thread, method, location, field_klass, object, field, sig_type, value); 2320 2321 // Destroy the JNI handle allocated above. 2322 if (handle_created) { 2323 JNIHandles::destroy_local(value->l); 2324 } 2325 } 2326 2327 void JvmtiExport::post_field_modification(JavaThread *thread, Method* method, 2328 address location, Klass* field_klass, Handle object, jfieldID field, 2329 char sig_type, jvalue *value_ptr) { 2330 2331 HandleMark hm(thread); 2332 methodHandle mh(thread, method); 2333 2334 JvmtiThreadState *state = thread->jvmti_thread_state(); 2335 if (state == NULL) { 2336 return; 2337 } 2338 if (thread->is_in_any_VTMS_transition()) { 2339 return; // no events should be posted if thread is in any VTMS transition 2340 } 2341 2342 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_MODIFICATION, 2343 ("[%s] Trg Field Modification event triggered", 2344 JvmtiTrace::safe_get_thread_name(thread))); 2345 JvmtiEnvThreadStateIterator it(state); 2346 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2347 if (ets->is_enabled(JVMTI_EVENT_FIELD_MODIFICATION)) { 2348 EVT_TRACE(JVMTI_EVENT_FIELD_MODIFICATION, 2349 ("[%s] Evt Field Modification event sent %s.%s @ " INTX_FORMAT, 2350 JvmtiTrace::safe_get_thread_name(thread), 2351 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 2352 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 2353 location - mh()->code_base() )); 2354 2355 JvmtiEnv *env = ets->get_env(); 2356 JvmtiLocationEventMark jem(thread, mh, location); 2357 jclass field_jclass = jem.to_jclass(field_klass); 2358 jobject field_jobject = jem.to_jobject(object()); 2359 JvmtiJavaThreadEventTransition jet(thread); 2360 jvmtiEventFieldModification callback = env->callbacks()->FieldModification; 2361 if (callback != NULL) { 2362 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 2363 jem.jni_methodID(), jem.location(), 2364 field_jclass, field_jobject, field, sig_type, *value_ptr); 2365 } 2366 } 2367 } 2368 } 2369 2370 void JvmtiExport::post_native_method_bind(Method* method, address* function_ptr) { 2371 JavaThread* thread = JavaThread::current(); 2372 assert(thread->thread_state() == _thread_in_vm, "must be in vm state"); 2373 2374 HandleMark hm(thread); 2375 methodHandle mh(thread, method); 2376 2377 if (thread->is_in_any_VTMS_transition()) { 2378 return; // no events should be posted if thread is in any VTMS transition 2379 } 2380 EVT_TRIG_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Trg Native Method Bind event triggered", 2381 JvmtiTrace::safe_get_thread_name(thread))); 2382 2383 if (JvmtiEventController::is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) { 2384 JvmtiEnvIterator it; 2385 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2386 if (env->is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) { 2387 EVT_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Evt Native Method Bind event sent", 2388 JvmtiTrace::safe_get_thread_name(thread) )); 2389 2390 JvmtiMethodEventMark jem(thread, mh); 2391 JvmtiJavaThreadEventTransition jet(thread); 2392 JNIEnv* jni_env = (env->phase() == JVMTI_PHASE_PRIMORDIAL) ? NULL : jem.jni_env(); 2393 jvmtiEventNativeMethodBind callback = env->callbacks()->NativeMethodBind; 2394 if (callback != NULL) { 2395 (*callback)(env->jvmti_external(), jni_env, jem.jni_thread(), 2396 jem.jni_methodID(), (void*)(*function_ptr), (void**)function_ptr); 2397 } 2398 } 2399 } 2400 } 2401 } 2402 2403 // Returns a record containing inlining information for the given nmethod 2404 jvmtiCompiledMethodLoadInlineRecord* create_inline_record(nmethod* nm) { 2405 jint numstackframes = 0; 2406 jvmtiCompiledMethodLoadInlineRecord* record = (jvmtiCompiledMethodLoadInlineRecord*)NEW_RESOURCE_OBJ(jvmtiCompiledMethodLoadInlineRecord); 2407 record->header.kind = JVMTI_CMLR_INLINE_INFO; 2408 record->header.next = NULL; 2409 record->header.majorinfoversion = JVMTI_CMLR_MAJOR_VERSION_1; 2410 record->header.minorinfoversion = JVMTI_CMLR_MINOR_VERSION_0; 2411 record->numpcs = 0; 2412 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) { 2413 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue; 2414 record->numpcs++; 2415 } 2416 record->pcinfo = (PCStackInfo*)(NEW_RESOURCE_ARRAY(PCStackInfo, record->numpcs)); 2417 int scope = 0; 2418 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) { 2419 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue; 2420 void* pc_address = (void*)p->real_pc(nm); 2421 assert(pc_address != NULL, "pc_address must be non-null"); 2422 record->pcinfo[scope].pc = pc_address; 2423 numstackframes=0; 2424 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != NULL;sd = sd->sender()) { 2425 numstackframes++; 2426 } 2427 assert(numstackframes != 0, "numstackframes must be nonzero."); 2428 record->pcinfo[scope].methods = (jmethodID *)NEW_RESOURCE_ARRAY(jmethodID, numstackframes); 2429 record->pcinfo[scope].bcis = (jint *)NEW_RESOURCE_ARRAY(jint, numstackframes); 2430 record->pcinfo[scope].numstackframes = numstackframes; 2431 int stackframe = 0; 2432 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != NULL;sd = sd->sender()) { 2433 // sd->method() can be NULL for stubs but not for nmethods. To be completely robust, include an assert that we should never see a null sd->method() 2434 guarantee(sd->method() != NULL, "sd->method() cannot be null."); 2435 record->pcinfo[scope].methods[stackframe] = sd->method()->jmethod_id(); 2436 record->pcinfo[scope].bcis[stackframe] = sd->bci(); 2437 stackframe++; 2438 } 2439 scope++; 2440 } 2441 return record; 2442 } 2443 2444 void JvmtiExport::post_compiled_method_load(nmethod *nm) { 2445 guarantee(!nm->is_unloading(), "nmethod isn't unloaded or unloading"); 2446 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 2447 return; 2448 } 2449 JavaThread* thread = JavaThread::current(); 2450 2451 assert(!thread->is_in_any_VTMS_transition(), "compiled method load events are not allowed in any VTMS transition"); 2452 2453 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD, 2454 ("[%s] method compile load event triggered", 2455 JvmtiTrace::safe_get_thread_name(thread))); 2456 2457 JvmtiEnvIterator it; 2458 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2459 post_compiled_method_load(env, nm); 2460 } 2461 } 2462 2463 // post a COMPILED_METHOD_LOAD event for a given environment 2464 void JvmtiExport::post_compiled_method_load(JvmtiEnv* env, nmethod *nm) { 2465 if (env->phase() == JVMTI_PHASE_PRIMORDIAL || !env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) { 2466 return; 2467 } 2468 jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad; 2469 if (callback == NULL) { 2470 return; 2471 } 2472 JavaThread* thread = JavaThread::current(); 2473 2474 assert(!thread->is_in_any_VTMS_transition(), "compiled method load events are not allowed in any VTMS transition"); 2475 2476 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD, 2477 ("[%s] method compile load event sent %s.%s ", 2478 JvmtiTrace::safe_get_thread_name(thread), 2479 (nm->method() == NULL) ? "NULL" : nm->method()->klass_name()->as_C_string(), 2480 (nm->method() == NULL) ? "NULL" : nm->method()->name()->as_C_string())); 2481 ResourceMark rm(thread); 2482 HandleMark hm(thread); 2483 2484 // Add inlining information 2485 jvmtiCompiledMethodLoadInlineRecord* inlinerecord = create_inline_record(nm); 2486 // Pass inlining information through the void pointer 2487 JvmtiCompiledMethodLoadEventMark jem(thread, nm, inlinerecord); 2488 JvmtiJavaThreadEventTransition jet(thread); 2489 (*callback)(env->jvmti_external(), jem.jni_methodID(), 2490 jem.code_size(), jem.code_data(), jem.map_length(), 2491 jem.map(), jem.compile_info()); 2492 } 2493 2494 void JvmtiExport::post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) { 2495 assert(name != NULL && name[0] != '\0', "sanity check"); 2496 2497 JavaThread* thread = JavaThread::current(); 2498 2499 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition"); 2500 2501 // In theory everyone coming thru here is in_vm but we need to be certain 2502 // because a callee will do a vm->native transition 2503 ThreadInVMfromUnknown __tiv; 2504 2505 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED, 2506 ("[%s] method dynamic code generated event triggered", 2507 JvmtiTrace::safe_get_thread_name(thread))); 2508 JvmtiEnvIterator it; 2509 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2510 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) { 2511 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED, 2512 ("[%s] dynamic code generated event sent for %s", 2513 JvmtiTrace::safe_get_thread_name(thread), name)); 2514 JvmtiEventMark jem(thread); 2515 JvmtiJavaThreadEventTransition jet(thread); 2516 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char)); 2517 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated; 2518 if (callback != NULL) { 2519 (*callback)(env->jvmti_external(), name, (void*)code_begin, length); 2520 } 2521 } 2522 } 2523 } 2524 2525 void JvmtiExport::post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) { 2526 jvmtiPhase phase = JvmtiEnv::get_phase(); 2527 if (phase == JVMTI_PHASE_PRIMORDIAL || phase == JVMTI_PHASE_START) { 2528 post_dynamic_code_generated_internal(name, code_begin, code_end); 2529 } else { 2530 // It may not be safe to post the event from this thread. Defer all 2531 // postings to the service thread so that it can perform them in a safe 2532 // context and in-order. 2533 JvmtiDeferredEvent event = JvmtiDeferredEvent::dynamic_code_generated_event( 2534 name, code_begin, code_end); 2535 ServiceThread::enqueue_deferred_event(&event); 2536 } 2537 } 2538 2539 2540 // post a DYNAMIC_CODE_GENERATED event for a given environment 2541 // used by GenerateEvents 2542 void JvmtiExport::post_dynamic_code_generated(JvmtiEnv* env, const char *name, 2543 const void *code_begin, const void *code_end) 2544 { 2545 JavaThread* thread = JavaThread::current(); 2546 2547 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition"); 2548 2549 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED, 2550 ("[%s] dynamic code generated event triggered (by GenerateEvents)", 2551 JvmtiTrace::safe_get_thread_name(thread))); 2552 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) { 2553 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED, 2554 ("[%s] dynamic code generated event sent for %s", 2555 JvmtiTrace::safe_get_thread_name(thread), name)); 2556 JvmtiEventMark jem(thread); 2557 JvmtiJavaThreadEventTransition jet(thread); 2558 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char)); 2559 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated; 2560 if (callback != NULL) { 2561 (*callback)(env->jvmti_external(), name, (void*)code_begin, length); 2562 } 2563 } 2564 } 2565 2566 // post a DynamicCodeGenerated event while holding locks in the VM. 2567 void JvmtiExport::post_dynamic_code_generated_while_holding_locks(const char* name, 2568 address code_begin, address code_end) 2569 { 2570 JavaThread* thread = JavaThread::current(); 2571 assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition"); 2572 2573 // register the stub with the current dynamic code event collector 2574 // Cannot take safepoint here so do not use state_for to get 2575 // jvmti thread state. 2576 // The collector and/or state might be NULL if JvmtiDynamicCodeEventCollector 2577 // has been initialized while JVMTI_EVENT_DYNAMIC_CODE_GENERATED was disabled. 2578 JvmtiThreadState* state = thread->jvmti_thread_state(); 2579 if (state != NULL) { 2580 JvmtiDynamicCodeEventCollector *collector = state->get_dynamic_code_event_collector(); 2581 if (collector != NULL) { 2582 collector->register_stub(name, code_begin, code_end); 2583 } 2584 } 2585 } 2586 2587 // Collect all the vm internally allocated objects which are visible to java world 2588 void JvmtiExport::record_vm_internal_object_allocation(oop obj) { 2589 Thread* thread = Thread::current_or_null(); 2590 if (thread != NULL && thread->is_Java_thread()) { 2591 // Can not take safepoint here. 2592 NoSafepointVerifier no_sfpt; 2593 // Cannot take safepoint here so do not use state_for to get 2594 // jvmti thread state. 2595 JvmtiThreadState *state = JavaThread::cast(thread)->jvmti_thread_state(); 2596 if (state != NULL) { 2597 // state is non NULL when VMObjectAllocEventCollector is enabled. 2598 JvmtiVMObjectAllocEventCollector *collector; 2599 collector = state->get_vm_object_alloc_event_collector(); 2600 if (collector != NULL && collector->is_enabled()) { 2601 // Don't record classes as these will be notified via the ClassLoad 2602 // event. 2603 if (obj->klass() != vmClasses::Class_klass()) { 2604 collector->record_allocation(obj); 2605 } 2606 } 2607 } 2608 } 2609 } 2610 2611 // Collect all the sampled allocated objects. 2612 void JvmtiExport::record_sampled_internal_object_allocation(oop obj) { 2613 Thread* thread = Thread::current_or_null(); 2614 if (thread != NULL && thread->is_Java_thread()) { 2615 // Can not take safepoint here. 2616 NoSafepointVerifier no_sfpt; 2617 // Cannot take safepoint here so do not use state_for to get 2618 // jvmti thread state. 2619 JvmtiThreadState *state = JavaThread::cast(thread)->jvmti_thread_state(); 2620 if (state != NULL) { 2621 // state is non NULL when SampledObjectAllocEventCollector is enabled. 2622 JvmtiSampledObjectAllocEventCollector *collector; 2623 collector = state->get_sampled_object_alloc_event_collector(); 2624 2625 if (collector != NULL && collector->is_enabled()) { 2626 collector->record_allocation(obj); 2627 } 2628 } 2629 } 2630 } 2631 2632 void JvmtiExport::post_garbage_collection_finish() { 2633 Thread *thread = Thread::current(); // this event is posted from VM-Thread. 2634 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH, 2635 ("[%s] garbage collection finish event triggered", 2636 JvmtiTrace::safe_get_thread_name(thread))); 2637 JvmtiEnvIterator it; 2638 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2639 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH)) { 2640 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH, 2641 ("[%s] garbage collection finish event sent", 2642 JvmtiTrace::safe_get_thread_name(thread))); 2643 JvmtiThreadEventTransition jet(thread); 2644 // JNIEnv is NULL here because this event is posted from VM Thread 2645 jvmtiEventGarbageCollectionFinish callback = env->callbacks()->GarbageCollectionFinish; 2646 if (callback != NULL) { 2647 (*callback)(env->jvmti_external()); 2648 } 2649 } 2650 } 2651 } 2652 2653 void JvmtiExport::post_garbage_collection_start() { 2654 Thread* thread = Thread::current(); // this event is posted from vm-thread. 2655 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START, 2656 ("[%s] garbage collection start event triggered", 2657 JvmtiTrace::safe_get_thread_name(thread))); 2658 JvmtiEnvIterator it; 2659 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2660 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_START)) { 2661 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START, 2662 ("[%s] garbage collection start event sent", 2663 JvmtiTrace::safe_get_thread_name(thread))); 2664 JvmtiThreadEventTransition jet(thread); 2665 // JNIEnv is NULL here because this event is posted from VM Thread 2666 jvmtiEventGarbageCollectionStart callback = env->callbacks()->GarbageCollectionStart; 2667 if (callback != NULL) { 2668 (*callback)(env->jvmti_external()); 2669 } 2670 } 2671 } 2672 } 2673 2674 void JvmtiExport::post_data_dump() { 2675 Thread *thread = Thread::current(); 2676 EVT_TRIG_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST, 2677 ("[%s] data dump request event triggered", 2678 JvmtiTrace::safe_get_thread_name(thread))); 2679 JvmtiEnvIterator it; 2680 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2681 if (env->is_enabled(JVMTI_EVENT_DATA_DUMP_REQUEST)) { 2682 EVT_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST, 2683 ("[%s] data dump request event sent", 2684 JvmtiTrace::safe_get_thread_name(thread))); 2685 JvmtiThreadEventTransition jet(thread); 2686 // JNIEnv is NULL here because this event is posted from VM Thread 2687 jvmtiEventDataDumpRequest callback = env->callbacks()->DataDumpRequest; 2688 if (callback != NULL) { 2689 (*callback)(env->jvmti_external()); 2690 } 2691 } 2692 } 2693 } 2694 2695 void JvmtiExport::post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) { 2696 oop object = obj_mntr->object(); 2697 JvmtiThreadState *state = thread->jvmti_thread_state(); 2698 if (state == NULL) { 2699 return; 2700 } 2701 if (thread->is_in_any_VTMS_transition()) { 2702 return; // no events should be posted if thread is in any VTMS transition 2703 } 2704 2705 HandleMark hm(thread); 2706 Handle h(thread, object); 2707 2708 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER, 2709 ("[%s] monitor contended enter event triggered", 2710 JvmtiTrace::safe_get_thread_name(thread))); 2711 JvmtiEnvThreadStateIterator it(state); 2712 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2713 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTER)) { 2714 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER, 2715 ("[%s] monitor contended enter event sent", 2716 JvmtiTrace::safe_get_thread_name(thread))); 2717 JvmtiMonitorEventMark jem(thread, h()); 2718 JvmtiEnv *env = ets->get_env(); 2719 JvmtiThreadEventTransition jet(thread); 2720 jvmtiEventMonitorContendedEnter callback = env->callbacks()->MonitorContendedEnter; 2721 if (callback != NULL) { 2722 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object()); 2723 } 2724 } 2725 } 2726 } 2727 2728 void JvmtiExport::post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) { 2729 oop object = obj_mntr->object(); 2730 JvmtiThreadState *state = thread->jvmti_thread_state(); 2731 if (state == NULL) { 2732 return; 2733 } 2734 if (thread->is_in_any_VTMS_transition()) { 2735 return; // no events should be posted if thread is in any VTMS transition 2736 } 2737 2738 HandleMark hm(thread); 2739 Handle h(thread, object); 2740 2741 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED, 2742 ("[%s] monitor contended entered event triggered", 2743 JvmtiTrace::safe_get_thread_name(thread))); 2744 2745 JvmtiEnvThreadStateIterator it(state); 2746 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2747 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED)) { 2748 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED, 2749 ("[%s] monitor contended enter event sent", 2750 JvmtiTrace::safe_get_thread_name(thread))); 2751 JvmtiMonitorEventMark jem(thread, h()); 2752 JvmtiEnv *env = ets->get_env(); 2753 JvmtiThreadEventTransition jet(thread); 2754 jvmtiEventMonitorContendedEntered callback = env->callbacks()->MonitorContendedEntered; 2755 if (callback != NULL) { 2756 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object()); 2757 } 2758 } 2759 } 2760 } 2761 2762 void JvmtiExport::post_monitor_wait(JavaThread *thread, oop object, 2763 jlong timeout) { 2764 JvmtiThreadState *state = thread->jvmti_thread_state(); 2765 if (state == NULL) { 2766 return; 2767 } 2768 if (thread->is_in_any_VTMS_transition()) { 2769 return; // no events should be posted if thread is in any VTMS transition 2770 } 2771 2772 HandleMark hm(thread); 2773 Handle h(thread, object); 2774 2775 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAIT, 2776 ("[%s] monitor wait event triggered", 2777 JvmtiTrace::safe_get_thread_name(thread))); 2778 JvmtiEnvThreadStateIterator it(state); 2779 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2780 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAIT)) { 2781 EVT_TRACE(JVMTI_EVENT_MONITOR_WAIT, 2782 ("[%s] monitor wait event sent", 2783 JvmtiTrace::safe_get_thread_name(thread))); 2784 JvmtiMonitorEventMark jem(thread, h()); 2785 JvmtiEnv *env = ets->get_env(); 2786 JvmtiThreadEventTransition jet(thread); 2787 jvmtiEventMonitorWait callback = env->callbacks()->MonitorWait; 2788 if (callback != NULL) { 2789 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 2790 jem.jni_object(), timeout); 2791 } 2792 } 2793 } 2794 } 2795 2796 void JvmtiExport::post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) { 2797 oop object = obj_mntr->object(); 2798 JvmtiThreadState *state = thread->jvmti_thread_state(); 2799 if (state == NULL) { 2800 return; 2801 } 2802 if (thread->is_in_any_VTMS_transition()) { 2803 return; // no events should be posted if thread is in any VTMS transition 2804 } 2805 2806 HandleMark hm(thread); 2807 Handle h(thread, object); 2808 2809 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAITED, 2810 ("[%s] monitor waited event triggered", 2811 JvmtiTrace::safe_get_thread_name(thread))); 2812 JvmtiEnvThreadStateIterator it(state); 2813 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2814 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAITED)) { 2815 EVT_TRACE(JVMTI_EVENT_MONITOR_WAITED, 2816 ("[%s] monitor waited event sent", 2817 JvmtiTrace::safe_get_thread_name(thread))); 2818 JvmtiMonitorEventMark jem(thread, h()); 2819 JvmtiEnv *env = ets->get_env(); 2820 JvmtiThreadEventTransition jet(thread); 2821 jvmtiEventMonitorWaited callback = env->callbacks()->MonitorWaited; 2822 if (callback != NULL) { 2823 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 2824 jem.jni_object(), timed_out); 2825 } 2826 } 2827 } 2828 } 2829 2830 void JvmtiExport::post_vm_object_alloc(JavaThread *thread, oop object) { 2831 if (object == NULL) { 2832 return; 2833 } 2834 if (thread->is_in_any_VTMS_transition()) { 2835 return; // no events should be posted if thread is in any VTMS transition 2836 } 2837 HandleMark hm(thread); 2838 Handle h(thread, object); 2839 2840 EVT_TRIG_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Trg vm object alloc triggered", 2841 JvmtiTrace::safe_get_thread_name(thread))); 2842 JvmtiEnvIterator it; 2843 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2844 if (env->is_enabled(JVMTI_EVENT_VM_OBJECT_ALLOC)) { 2845 EVT_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Evt vmobject alloc sent %s", 2846 JvmtiTrace::safe_get_thread_name(thread), 2847 object==NULL? "NULL" : object->klass()->external_name())); 2848 2849 JvmtiObjectAllocEventMark jem(thread, h()); 2850 JvmtiJavaThreadEventTransition jet(thread); 2851 jvmtiEventVMObjectAlloc callback = env->callbacks()->VMObjectAlloc; 2852 if (callback != NULL) { 2853 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 2854 jem.jni_jobject(), jem.jni_class(), jem.size()); 2855 } 2856 } 2857 } 2858 } 2859 2860 void JvmtiExport::post_sampled_object_alloc(JavaThread *thread, oop object) { 2861 JvmtiThreadState *state = thread->jvmti_thread_state(); 2862 if (state == NULL) { 2863 return; 2864 } 2865 if (object == NULL) { 2866 return; 2867 } 2868 if (thread->is_in_any_VTMS_transition()) { 2869 return; // no events should be posted if thread is in any VTMS transition 2870 } 2871 HandleMark hm(thread); 2872 Handle h(thread, object); 2873 2874 EVT_TRIG_TRACE(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC, 2875 ("[%s] Trg sampled object alloc triggered", 2876 JvmtiTrace::safe_get_thread_name(thread))); 2877 JvmtiEnvThreadStateIterator it(state); 2878 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2879 if (ets->is_enabled(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC)) { 2880 EVT_TRACE(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC, 2881 ("[%s] Evt sampled object alloc sent %s", 2882 JvmtiTrace::safe_get_thread_name(thread), 2883 object == NULL ? "NULL" : object->klass()->external_name())); 2884 2885 JvmtiEnv *env = ets->get_env(); 2886 JvmtiObjectAllocEventMark jem(thread, h()); 2887 JvmtiJavaThreadEventTransition jet(thread); 2888 jvmtiEventSampledObjectAlloc callback = env->callbacks()->SampledObjectAlloc; 2889 if (callback != NULL) { 2890 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 2891 jem.jni_jobject(), jem.jni_class(), jem.size()); 2892 } 2893 } 2894 } 2895 } 2896 2897 //////////////////////////////////////////////////////////////////////////////////////////////// 2898 2899 void JvmtiExport::cleanup_thread(JavaThread* thread) { 2900 assert(JavaThread::current() == thread, "thread is not current"); 2901 MutexLocker mu(thread, JvmtiThreadState_lock); 2902 2903 if (thread->jvmti_thread_state() != NULL) { 2904 // This has to happen after the thread state is removed, which is 2905 // why it is not in post_thread_end_event like its complement 2906 // Maybe both these functions should be rolled into the posts? 2907 JvmtiEventController::thread_ended(thread); 2908 } 2909 } 2910 2911 void JvmtiExport::clear_detected_exception(JavaThread* thread) { 2912 assert(JavaThread::current() == thread, "thread is not current"); 2913 2914 JvmtiThreadState* state = thread->jvmti_thread_state(); 2915 if (state != NULL) { 2916 state->clear_exception_state(); 2917 } 2918 } 2919 2920 // Onload raw monitor transition. 2921 void JvmtiExport::transition_pending_onload_raw_monitors() { 2922 JvmtiPendingMonitors::transition_raw_monitors(); 2923 } 2924 2925 //////////////////////////////////////////////////////////////////////////////////////////////// 2926 #if INCLUDE_SERVICES 2927 // Attach is disabled if SERVICES is not included 2928 2929 // type for the Agent_OnAttach entry point 2930 extern "C" { 2931 typedef jint (JNICALL *OnAttachEntry_t)(JavaVM*, char *, void *); 2932 } 2933 2934 jint JvmtiExport::load_agent_library(const char *agent, const char *absParam, 2935 const char *options, outputStream* st) { 2936 char ebuf[1024] = {0}; 2937 char buffer[JVM_MAXPATHLEN]; 2938 void* library = NULL; 2939 jint result = JNI_ERR; 2940 const char *on_attach_symbols[] = AGENT_ONATTACH_SYMBOLS; 2941 size_t num_symbol_entries = ARRAY_SIZE(on_attach_symbols); 2942 2943 // The abs parameter should be "true" or "false" 2944 bool is_absolute_path = (absParam != NULL) && (strcmp(absParam,"true")==0); 2945 2946 // Initially marked as invalid. It will be set to valid if we can find the agent 2947 AgentLibrary *agent_lib = new AgentLibrary(agent, options, is_absolute_path, NULL); 2948 2949 // Check for statically linked in agent. If not found then if the path is 2950 // absolute we attempt to load the library. Otherwise we try to load it 2951 // from the standard dll directory. 2952 2953 if (!os::find_builtin_agent(agent_lib, on_attach_symbols, num_symbol_entries)) { 2954 if (is_absolute_path) { 2955 library = os::dll_load(agent, ebuf, sizeof ebuf); 2956 } else { 2957 // Try to load the agent from the standard dll directory 2958 if (os::dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(), 2959 agent)) { 2960 library = os::dll_load(buffer, ebuf, sizeof ebuf); 2961 } 2962 if (library == NULL) { 2963 // not found - try OS default library path 2964 if (os::dll_build_name(buffer, sizeof(buffer), agent)) { 2965 library = os::dll_load(buffer, ebuf, sizeof ebuf); 2966 } 2967 } 2968 } 2969 if (library != NULL) { 2970 agent_lib->set_os_lib(library); 2971 agent_lib->set_valid(); 2972 } 2973 } 2974 // If the library was loaded then we attempt to invoke the Agent_OnAttach 2975 // function 2976 if (agent_lib->valid()) { 2977 // Lookup the Agent_OnAttach function 2978 OnAttachEntry_t on_attach_entry = NULL; 2979 on_attach_entry = CAST_TO_FN_PTR(OnAttachEntry_t, 2980 os::find_agent_function(agent_lib, false, on_attach_symbols, num_symbol_entries)); 2981 if (on_attach_entry == NULL) { 2982 // Agent_OnAttach missing - unload library 2983 if (!agent_lib->is_static_lib()) { 2984 os::dll_unload(library); 2985 } 2986 st->print_cr("%s is not available in %s", 2987 on_attach_symbols[0], agent_lib->name()); 2988 delete agent_lib; 2989 } else { 2990 // Invoke the Agent_OnAttach function 2991 JavaThread* THREAD = JavaThread::current(); // For exception macros. 2992 { 2993 extern struct JavaVM_ main_vm; 2994 JvmtiThreadEventMark jem(THREAD); 2995 JvmtiJavaThreadEventTransition jet(THREAD); 2996 2997 result = (*on_attach_entry)(&main_vm, (char*)options, NULL); 2998 2999 // Agent_OnAttach may have used JNI 3000 if (THREAD->is_pending_jni_exception_check()) { 3001 THREAD->clear_pending_jni_exception_check(); 3002 } 3003 } 3004 3005 // Agent_OnAttach may have used JNI 3006 if (HAS_PENDING_EXCEPTION) { 3007 CLEAR_PENDING_EXCEPTION; 3008 } 3009 3010 // If OnAttach returns JNI_OK then we add it to the list of 3011 // agent libraries so that we can call Agent_OnUnload later. 3012 if (result == JNI_OK) { 3013 Arguments::add_loaded_agent(agent_lib); 3014 } else { 3015 if (!agent_lib->is_static_lib()) { 3016 os::dll_unload(library); 3017 } 3018 delete agent_lib; 3019 } 3020 3021 // Agent_OnAttach executed so completion status is JNI_OK 3022 st->print_cr("return code: %d", result); 3023 result = JNI_OK; 3024 } 3025 } else { 3026 st->print_cr("%s was not loaded.", agent); 3027 if (*ebuf != '\0') { 3028 st->print_cr("%s", ebuf); 3029 } 3030 } 3031 return result; 3032 } 3033 3034 #endif // INCLUDE_SERVICES 3035 //////////////////////////////////////////////////////////////////////////////////////////////// 3036 3037 // Setup current current thread for event collection. 3038 void JvmtiEventCollector::setup_jvmti_thread_state() { 3039 // set this event collector to be the current one. 3040 JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current()); 3041 // state can only be NULL if the current thread is exiting which 3042 // should not happen since we're trying to configure for event collection 3043 guarantee(state != NULL, "exiting thread called setup_jvmti_thread_state"); 3044 if (is_vm_object_alloc_event()) { 3045 JvmtiVMObjectAllocEventCollector *prev = state->get_vm_object_alloc_event_collector(); 3046 3047 // If we have a previous collector and it is disabled, it means this allocation came from a 3048 // callback induced VM Object allocation, do not register this collector then. 3049 if (prev && !prev->is_enabled()) { 3050 return; 3051 } 3052 _prev = prev; 3053 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)this); 3054 } else if (is_dynamic_code_event()) { 3055 _prev = state->get_dynamic_code_event_collector(); 3056 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)this); 3057 } else if (is_sampled_object_alloc_event()) { 3058 JvmtiSampledObjectAllocEventCollector *prev = state->get_sampled_object_alloc_event_collector(); 3059 3060 if (prev) { 3061 // JvmtiSampledObjectAllocEventCollector wants only one active collector 3062 // enabled. This allows to have a collector detect a user code requiring 3063 // a sample in the callback. 3064 return; 3065 } 3066 state->set_sampled_object_alloc_event_collector((JvmtiSampledObjectAllocEventCollector*) this); 3067 } 3068 3069 _unset_jvmti_thread_state = true; 3070 } 3071 3072 // Unset current event collection in this thread and reset it with previous 3073 // collector. 3074 void JvmtiEventCollector::unset_jvmti_thread_state() { 3075 if (!_unset_jvmti_thread_state) { 3076 return; 3077 } 3078 3079 JvmtiThreadState* state = JavaThread::current()->jvmti_thread_state(); 3080 if (state != NULL) { 3081 // restore the previous event collector (if any) 3082 if (is_vm_object_alloc_event()) { 3083 if (state->get_vm_object_alloc_event_collector() == this) { 3084 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)_prev); 3085 } else { 3086 // this thread's jvmti state was created during the scope of 3087 // the event collector. 3088 } 3089 } else if (is_dynamic_code_event()) { 3090 if (state->get_dynamic_code_event_collector() == this) { 3091 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)_prev); 3092 } else { 3093 // this thread's jvmti state was created during the scope of 3094 // the event collector. 3095 } 3096 } else if (is_sampled_object_alloc_event()) { 3097 if (state->get_sampled_object_alloc_event_collector() == this) { 3098 state->set_sampled_object_alloc_event_collector((JvmtiSampledObjectAllocEventCollector*)_prev); 3099 } else { 3100 // this thread's jvmti state was created during the scope of 3101 // the event collector. 3102 } 3103 } 3104 } 3105 } 3106 3107 // create the dynamic code event collector 3108 JvmtiDynamicCodeEventCollector::JvmtiDynamicCodeEventCollector() : _code_blobs(NULL) { 3109 if (JvmtiExport::should_post_dynamic_code_generated()) { 3110 setup_jvmti_thread_state(); 3111 } 3112 } 3113 3114 // iterate over any code blob descriptors collected and post a 3115 // DYNAMIC_CODE_GENERATED event to the profiler. 3116 JvmtiDynamicCodeEventCollector::~JvmtiDynamicCodeEventCollector() { 3117 assert(!JavaThread::current()->owns_locks(), "all locks must be released to post deferred events"); 3118 // iterate over any code blob descriptors that we collected 3119 if (_code_blobs != NULL) { 3120 for (int i=0; i<_code_blobs->length(); i++) { 3121 JvmtiCodeBlobDesc* blob = _code_blobs->at(i); 3122 JvmtiExport::post_dynamic_code_generated(blob->name(), blob->code_begin(), blob->code_end()); 3123 FreeHeap(blob); 3124 } 3125 delete _code_blobs; 3126 } 3127 unset_jvmti_thread_state(); 3128 } 3129 3130 // register a stub 3131 void JvmtiDynamicCodeEventCollector::register_stub(const char* name, address start, address end) { 3132 if (_code_blobs == NULL) { 3133 _code_blobs = new (mtServiceability) GrowableArray<JvmtiCodeBlobDesc*>(1, mtServiceability); 3134 } 3135 _code_blobs->append(new JvmtiCodeBlobDesc(name, start, end)); 3136 } 3137 3138 // Setup current thread to record vm allocated objects. 3139 JvmtiObjectAllocEventCollector::JvmtiObjectAllocEventCollector() : 3140 _allocated(NULL), _enable(false), _post_callback(NULL) { 3141 } 3142 3143 // Post vm_object_alloc event for vm allocated objects visible to java 3144 // world. 3145 void JvmtiObjectAllocEventCollector::generate_call_for_allocated() { 3146 if (_allocated) { 3147 set_enabled(false); 3148 for (int i = 0; i < _allocated->length(); i++) { 3149 oop obj = _allocated->at(i).resolve(); 3150 _post_callback(JavaThread::current(), obj); 3151 // Release OopHandle 3152 _allocated->at(i).release(JvmtiExport::jvmti_oop_storage()); 3153 3154 } 3155 delete _allocated, _allocated = NULL; 3156 } 3157 } 3158 3159 void JvmtiObjectAllocEventCollector::record_allocation(oop obj) { 3160 assert(is_enabled(), "Object alloc event collector is not enabled"); 3161 if (_allocated == NULL) { 3162 _allocated = new (mtServiceability) GrowableArray<OopHandle>(1, mtServiceability); 3163 } 3164 _allocated->push(OopHandle(JvmtiExport::jvmti_oop_storage(), obj)); 3165 } 3166 3167 // Disable collection of VMObjectAlloc events 3168 NoJvmtiVMObjectAllocMark::NoJvmtiVMObjectAllocMark() : _collector(NULL) { 3169 // a no-op if VMObjectAlloc event is not enabled 3170 if (!JvmtiExport::should_post_vm_object_alloc()) { 3171 return; 3172 } 3173 Thread* thread = Thread::current_or_null(); 3174 if (thread != NULL && thread->is_Java_thread()) { 3175 JavaThread* current_thread = JavaThread::cast(thread); 3176 JvmtiThreadState *state = current_thread->jvmti_thread_state(); 3177 if (state != NULL) { 3178 JvmtiVMObjectAllocEventCollector *collector; 3179 collector = state->get_vm_object_alloc_event_collector(); 3180 if (collector != NULL && collector->is_enabled()) { 3181 _collector = collector; 3182 _collector->set_enabled(false); 3183 } 3184 } 3185 } 3186 } 3187 3188 // Re-Enable collection of VMObjectAlloc events (if previously enabled) 3189 NoJvmtiVMObjectAllocMark::~NoJvmtiVMObjectAllocMark() { 3190 if (was_enabled()) { 3191 _collector->set_enabled(true); 3192 } 3193 }; 3194 3195 // Setup current thread to record vm allocated objects. 3196 JvmtiVMObjectAllocEventCollector::JvmtiVMObjectAllocEventCollector() { 3197 if (JvmtiExport::should_post_vm_object_alloc()) { 3198 _enable = true; 3199 setup_jvmti_thread_state(); 3200 _post_callback = JvmtiExport::post_vm_object_alloc; 3201 } 3202 } 3203 3204 JvmtiVMObjectAllocEventCollector::~JvmtiVMObjectAllocEventCollector() { 3205 if (_enable) { 3206 generate_call_for_allocated(); 3207 } 3208 unset_jvmti_thread_state(); 3209 } 3210 3211 bool JvmtiSampledObjectAllocEventCollector::object_alloc_is_safe_to_sample() { 3212 Thread* thread = Thread::current(); 3213 // Really only sample allocations if this is a JavaThread and not the compiler 3214 // thread. 3215 if (!thread->is_Java_thread() || thread->is_Compiler_thread()) { 3216 return false; 3217 } 3218 3219 if (MultiArray_lock->owner() == thread) { 3220 return false; 3221 } 3222 return true; 3223 } 3224 3225 // Setup current thread to record sampled allocated objects. 3226 void JvmtiSampledObjectAllocEventCollector::start() { 3227 if (JvmtiExport::should_post_sampled_object_alloc()) { 3228 if (!object_alloc_is_safe_to_sample()) { 3229 return; 3230 } 3231 3232 _enable = true; 3233 setup_jvmti_thread_state(); 3234 _post_callback = JvmtiExport::post_sampled_object_alloc; 3235 } 3236 } 3237 3238 JvmtiSampledObjectAllocEventCollector::~JvmtiSampledObjectAllocEventCollector() { 3239 if (!_enable) { 3240 return; 3241 } 3242 3243 generate_call_for_allocated(); 3244 unset_jvmti_thread_state(); 3245 3246 // Unset the sampling collector as present in assertion mode only. 3247 assert(Thread::current()->is_Java_thread(), 3248 "Should always be in a Java thread"); 3249 } 3250 3251 JvmtiGCMarker::JvmtiGCMarker() { 3252 // if there aren't any JVMTI environments then nothing to do 3253 if (!JvmtiEnv::environments_might_exist()) { 3254 return; 3255 } 3256 3257 if (JvmtiExport::should_post_garbage_collection_start()) { 3258 JvmtiExport::post_garbage_collection_start(); 3259 } 3260 3261 if (SafepointSynchronize::is_at_safepoint()) { 3262 // Do clean up tasks that need to be done at a safepoint 3263 JvmtiEnvBase::check_for_periodic_clean_up(); 3264 } 3265 } 3266 3267 JvmtiGCMarker::~JvmtiGCMarker() { 3268 // if there aren't any JVMTI environments then nothing to do 3269 if (!JvmtiEnv::environments_might_exist()) { 3270 return; 3271 } 3272 3273 // JVMTI notify gc finish 3274 if (JvmtiExport::should_post_garbage_collection_finish()) { 3275 JvmtiExport::post_garbage_collection_finish(); 3276 } 3277 }