1 /* 2 * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/systemDictionary.hpp" 27 #include "code/nmethod.hpp" 28 #include "code/pcDesc.hpp" 29 #include "code/scopeDesc.hpp" 30 #include "interpreter/interpreter.hpp" 31 #include "jvmtifiles/jvmtiEnv.hpp" 32 #include "logging/log.hpp" 33 #include "logging/logStream.hpp" 34 #include "memory/resourceArea.hpp" 35 #include "oops/objArrayKlass.hpp" 36 #include "oops/objArrayOop.hpp" 37 #include "oops/oop.inline.hpp" 38 #include "prims/jvmtiCodeBlobEvents.hpp" 39 #include "prims/jvmtiEventController.hpp" 40 #include "prims/jvmtiEventController.inline.hpp" 41 #include "prims/jvmtiExport.hpp" 42 #include "prims/jvmtiImpl.hpp" 43 #include "prims/jvmtiManageCapabilities.hpp" 44 #include "prims/jvmtiRawMonitor.hpp" 45 #include "prims/jvmtiRedefineClasses.hpp" 46 #include "prims/jvmtiTagMap.hpp" 47 #include "prims/jvmtiThreadState.inline.hpp" 48 #include "runtime/arguments.hpp" 49 #include "runtime/handles.hpp" 50 #include "runtime/interfaceSupport.hpp" 51 #include "runtime/javaCalls.hpp" 52 #include "runtime/objectMonitor.hpp" 53 #include "runtime/objectMonitor.inline.hpp" 54 #include "runtime/os.inline.hpp" 55 #include "runtime/thread.inline.hpp" 56 #include "runtime/vframe.hpp" 57 #include "services/serviceUtil.hpp" 58 #include "utilities/macros.hpp" 59 #if INCLUDE_ALL_GCS 60 #include "gc/parallel/psMarkSweep.hpp" 61 #endif // INCLUDE_ALL_GCS 62 63 #ifdef JVMTI_TRACE 64 #define EVT_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_SENT) != 0) { SafeResourceMark rm; log_trace(jvmti) out; } 65 #define EVT_TRIG_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_TRIGGER) != 0) { SafeResourceMark rm; log_trace(jvmti) out; } 66 #else 67 #define EVT_TRIG_TRACE(evt,out) 68 #define EVT_TRACE(evt,out) 69 #endif 70 71 /////////////////////////////////////////////////////////////// 72 // 73 // JvmtiEventTransition 74 // 75 // TO DO -- 76 // more handle purging 77 78 // Use this for JavaThreads and state is _thread_in_vm. 79 class JvmtiJavaThreadEventTransition : StackObj { 80 private: 81 ResourceMark _rm; 82 ThreadToNativeFromVM _transition; 83 HandleMark _hm; 84 85 public: 86 JvmtiJavaThreadEventTransition(JavaThread *thread) : 87 _rm(), 88 _transition(thread), 89 _hm(thread) {}; 90 }; 91 92 // For JavaThreads which are not in _thread_in_vm state 93 // and other system threads use this. 94 class JvmtiThreadEventTransition : StackObj { 95 private: 96 ResourceMark _rm; 97 HandleMark _hm; 98 JavaThreadState _saved_state; 99 JavaThread *_jthread; 100 101 public: 102 JvmtiThreadEventTransition(Thread *thread) : _rm(), _hm() { 103 if (thread->is_Java_thread()) { 104 _jthread = (JavaThread *)thread; 105 _saved_state = _jthread->thread_state(); 106 if (_saved_state == _thread_in_Java) { 107 ThreadStateTransition::transition_from_java(_jthread, _thread_in_native); 108 } else { 109 ThreadStateTransition::transition(_jthread, _saved_state, _thread_in_native); 110 } 111 } else { 112 _jthread = NULL; 113 } 114 } 115 116 ~JvmtiThreadEventTransition() { 117 if (_jthread != NULL) 118 ThreadStateTransition::transition_from_native(_jthread, _saved_state); 119 } 120 }; 121 122 123 /////////////////////////////////////////////////////////////// 124 // 125 // JvmtiEventMark 126 // 127 128 class JvmtiEventMark : public StackObj { 129 private: 130 JavaThread *_thread; 131 JNIEnv* _jni_env; 132 JvmtiThreadState::ExceptionState _saved_exception_state; 133 #if 0 134 JNIHandleBlock* _hblock; 135 #endif 136 137 public: 138 JvmtiEventMark(JavaThread *thread) : _thread(thread), 139 _jni_env(thread->jni_environment()), 140 _saved_exception_state(JvmtiThreadState::ES_CLEARED) { 141 #if 0 142 _hblock = thread->active_handles(); 143 _hblock->clear_thoroughly(); // so we can be safe 144 #else 145 // we want to use the code above - but that needs the JNIHandle changes - later... 146 // for now, steal JNI push local frame code 147 JvmtiThreadState *state = thread->jvmti_thread_state(); 148 // we are before an event. 149 // Save current jvmti thread exception state. 150 if (state != NULL) { 151 _saved_exception_state = state->get_exception_state(); 152 } 153 154 JNIHandleBlock* old_handles = thread->active_handles(); 155 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread); 156 assert(new_handles != NULL, "should not be NULL"); 157 new_handles->set_pop_frame_link(old_handles); 158 thread->set_active_handles(new_handles); 159 #endif 160 assert(thread == JavaThread::current(), "thread must be current!"); 161 thread->frame_anchor()->make_walkable(thread); 162 }; 163 164 ~JvmtiEventMark() { 165 #if 0 166 _hblock->clear(); // for consistency with future correct behavior 167 #else 168 // we want to use the code above - but that needs the JNIHandle changes - later... 169 // for now, steal JNI pop local frame code 170 JNIHandleBlock* old_handles = _thread->active_handles(); 171 JNIHandleBlock* new_handles = old_handles->pop_frame_link(); 172 assert(new_handles != NULL, "should not be NULL"); 173 _thread->set_active_handles(new_handles); 174 // Note that we set the pop_frame_link to NULL explicitly, otherwise 175 // the release_block call will release the blocks. 176 old_handles->set_pop_frame_link(NULL); 177 JNIHandleBlock::release_block(old_handles, _thread); // may block 178 #endif 179 180 JvmtiThreadState* state = _thread->jvmti_thread_state(); 181 // we are continuing after an event. 182 if (state != NULL) { 183 // Restore the jvmti thread exception state. 184 state->restore_exception_state(_saved_exception_state); 185 } 186 } 187 188 #if 0 189 jobject to_jobject(oop obj) { return obj == NULL? NULL : _hblock->allocate_handle_fast(obj); } 190 #else 191 // we want to use the code above - but that needs the JNIHandle changes - later... 192 // for now, use regular make_local 193 jobject to_jobject(oop obj) { return JNIHandles::make_local(_thread,obj); } 194 #endif 195 196 jclass to_jclass(Klass* klass) { return (klass == NULL ? NULL : (jclass)to_jobject(klass->java_mirror())); } 197 198 jmethodID to_jmethodID(const methodHandle& method) { return method->jmethod_id(); } 199 200 JNIEnv* jni_env() { return _jni_env; } 201 }; 202 203 class JvmtiThreadEventMark : public JvmtiEventMark { 204 private: 205 jthread _jt; 206 207 public: 208 JvmtiThreadEventMark(JavaThread *thread) : 209 JvmtiEventMark(thread) { 210 _jt = (jthread)(to_jobject(thread->threadObj())); 211 }; 212 jthread jni_thread() { return _jt; } 213 }; 214 215 class JvmtiClassEventMark : public JvmtiThreadEventMark { 216 private: 217 jclass _jc; 218 219 public: 220 JvmtiClassEventMark(JavaThread *thread, Klass* klass) : 221 JvmtiThreadEventMark(thread) { 222 _jc = to_jclass(klass); 223 }; 224 jclass jni_class() { return _jc; } 225 }; 226 227 class JvmtiMethodEventMark : public JvmtiThreadEventMark { 228 private: 229 jmethodID _mid; 230 231 public: 232 JvmtiMethodEventMark(JavaThread *thread, const methodHandle& method) : 233 JvmtiThreadEventMark(thread), 234 _mid(to_jmethodID(method)) {}; 235 jmethodID jni_methodID() { return _mid; } 236 }; 237 238 class JvmtiLocationEventMark : public JvmtiMethodEventMark { 239 private: 240 jlocation _loc; 241 242 public: 243 JvmtiLocationEventMark(JavaThread *thread, const methodHandle& method, address location) : 244 JvmtiMethodEventMark(thread, method), 245 _loc(location - method->code_base()) {}; 246 jlocation location() { return _loc; } 247 }; 248 249 class JvmtiExceptionEventMark : public JvmtiLocationEventMark { 250 private: 251 jobject _exc; 252 253 public: 254 JvmtiExceptionEventMark(JavaThread *thread, const methodHandle& method, address location, Handle exception) : 255 JvmtiLocationEventMark(thread, method, location), 256 _exc(to_jobject(exception())) {}; 257 jobject exception() { return _exc; } 258 }; 259 260 class JvmtiClassFileLoadEventMark : public JvmtiThreadEventMark { 261 private: 262 const char *_class_name; 263 jobject _jloader; 264 jobject _protection_domain; 265 jclass _class_being_redefined; 266 267 public: 268 JvmtiClassFileLoadEventMark(JavaThread *thread, Symbol* name, 269 Handle class_loader, Handle prot_domain, Klass* class_being_redefined) : JvmtiThreadEventMark(thread) { 270 _class_name = name != NULL? name->as_utf8() : NULL; 271 _jloader = (jobject)to_jobject(class_loader()); 272 _protection_domain = (jobject)to_jobject(prot_domain()); 273 if (class_being_redefined == NULL) { 274 _class_being_redefined = NULL; 275 } else { 276 _class_being_redefined = (jclass)to_jclass(class_being_redefined); 277 } 278 }; 279 const char *class_name() { 280 return _class_name; 281 } 282 jobject jloader() { 283 return _jloader; 284 } 285 jobject protection_domain() { 286 return _protection_domain; 287 } 288 jclass class_being_redefined() { 289 return _class_being_redefined; 290 } 291 }; 292 293 ////////////////////////////////////////////////////////////////////////////// 294 295 int JvmtiExport::_field_access_count = 0; 296 int JvmtiExport::_field_modification_count = 0; 297 298 bool JvmtiExport::_can_access_local_variables = false; 299 bool JvmtiExport::_can_hotswap_or_post_breakpoint = false; 300 bool JvmtiExport::_can_modify_any_class = false; 301 bool JvmtiExport::_can_walk_any_space = false; 302 303 bool JvmtiExport::_has_redefined_a_class = false; 304 bool JvmtiExport::_all_dependencies_are_recorded = false; 305 306 // 307 // field access management 308 // 309 310 // interpreter generator needs the address of the counter 311 address JvmtiExport::get_field_access_count_addr() { 312 // We don't grab a lock because we don't want to 313 // serialize field access between all threads. This means that a 314 // thread on another processor can see the wrong count value and 315 // may either miss making a needed call into post_field_access() 316 // or will make an unneeded call into post_field_access(). We pay 317 // this price to avoid slowing down the VM when we aren't watching 318 // field accesses. 319 // Other access/mutation safe by virtue of being in VM state. 320 return (address)(&_field_access_count); 321 } 322 323 // 324 // field modification management 325 // 326 327 // interpreter generator needs the address of the counter 328 address JvmtiExport::get_field_modification_count_addr() { 329 // We don't grab a lock because we don't 330 // want to serialize field modification between all threads. This 331 // means that a thread on another processor can see the wrong 332 // count value and may either miss making a needed call into 333 // post_field_modification() or will make an unneeded call into 334 // post_field_modification(). We pay this price to avoid slowing 335 // down the VM when we aren't watching field modifications. 336 // Other access/mutation safe by virtue of being in VM state. 337 return (address)(&_field_modification_count); 338 } 339 340 341 /////////////////////////////////////////////////////////////// 342 // Functions needed by java.lang.instrument for starting up javaagent. 343 /////////////////////////////////////////////////////////////// 344 345 jint 346 JvmtiExport::get_jvmti_interface(JavaVM *jvm, void **penv, jint version) { 347 // The JVMTI_VERSION_INTERFACE_JVMTI part of the version number 348 // has already been validated in JNI GetEnv(). 349 int major, minor, micro; 350 351 // micro version doesn't matter here (yet?) 352 decode_version_values(version, &major, &minor, µ); 353 switch (major) { 354 case 1: 355 switch (minor) { 356 case 0: // version 1.0.<micro> is recognized 357 case 1: // version 1.1.<micro> is recognized 358 case 2: // version 1.2.<micro> is recognized 359 break; 360 361 default: 362 return JNI_EVERSION; // unsupported minor version number 363 } 364 break; 365 case 9: 366 switch (minor) { 367 case 0: // version 9.0.<micro> is recognized 368 break; 369 default: 370 return JNI_EVERSION; // unsupported minor version number 371 } 372 break; 373 default: 374 return JNI_EVERSION; // unsupported major version number 375 } 376 377 if (JvmtiEnv::get_phase() == JVMTI_PHASE_LIVE) { 378 JavaThread* current_thread = JavaThread::current(); 379 // transition code: native to VM 380 ThreadInVMfromNative __tiv(current_thread); 381 VM_ENTRY_BASE(jvmtiEnv*, JvmtiExport::get_jvmti_interface, current_thread) 382 debug_only(VMNativeEntryWrapper __vew;) 383 384 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version); 385 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv* 386 return JNI_OK; 387 388 } else if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) { 389 // not live, no thread to transition 390 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version); 391 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv* 392 return JNI_OK; 393 394 } else { 395 // Called at the wrong time 396 *penv = NULL; 397 return JNI_EDETACHED; 398 } 399 } 400 401 void 402 JvmtiExport::add_default_read_edges(Handle h_module, TRAPS) { 403 if (!Universe::is_module_initialized()) { 404 return; // extra safety 405 } 406 assert(!h_module.is_null(), "module should always be set"); 407 408 // Invoke the transformedByAgent method 409 JavaValue result(T_VOID); 410 JavaCalls::call_static(&result, 411 SystemDictionary::module_Modules_klass(), 412 vmSymbols::transformedByAgent_name(), 413 vmSymbols::transformedByAgent_signature(), 414 h_module, 415 THREAD); 416 417 if (HAS_PENDING_EXCEPTION) { 418 LogTarget(Trace, jvmti) log; 419 LogStream log_stream(log); 420 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 421 log_stream.cr(); 422 CLEAR_PENDING_EXCEPTION; 423 return; 424 } 425 } 426 427 jvmtiError 428 JvmtiExport::add_module_reads(Handle module, Handle to_module, TRAPS) { 429 if (!Universe::is_module_initialized()) { 430 return JVMTI_ERROR_NONE; // extra safety 431 } 432 assert(!module.is_null(), "module should always be set"); 433 assert(!to_module.is_null(), "to_module should always be set"); 434 435 // Invoke the addReads method 436 JavaValue result(T_VOID); 437 JavaCalls::call_static(&result, 438 SystemDictionary::module_Modules_klass(), 439 vmSymbols::addReads_name(), 440 vmSymbols::addReads_signature(), 441 module, 442 to_module, 443 THREAD); 444 445 if (HAS_PENDING_EXCEPTION) { 446 LogTarget(Trace, jvmti) log; 447 LogStream log_stream(log); 448 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 449 log_stream.cr(); 450 CLEAR_PENDING_EXCEPTION; 451 return JVMTI_ERROR_INTERNAL; 452 } 453 return JVMTI_ERROR_NONE; 454 } 455 456 jvmtiError 457 JvmtiExport::add_module_exports(Handle module, Handle pkg_name, Handle to_module, TRAPS) { 458 if (!Universe::is_module_initialized()) { 459 return JVMTI_ERROR_NONE; // extra safety 460 } 461 assert(!module.is_null(), "module should always be set"); 462 assert(!to_module.is_null(), "to_module should always be set"); 463 assert(!pkg_name.is_null(), "pkg_name should always be set"); 464 465 // Invoke the addExports method 466 JavaValue result(T_VOID); 467 JavaCalls::call_static(&result, 468 SystemDictionary::module_Modules_klass(), 469 vmSymbols::addExports_name(), 470 vmSymbols::addExports_signature(), 471 module, 472 pkg_name, 473 to_module, 474 THREAD); 475 476 if (HAS_PENDING_EXCEPTION) { 477 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); 478 LogTarget(Trace, jvmti) log; 479 LogStream log_stream(log); 480 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 481 log_stream.cr(); 482 CLEAR_PENDING_EXCEPTION; 483 if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) { 484 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 485 } 486 return JVMTI_ERROR_INTERNAL; 487 } 488 return JVMTI_ERROR_NONE; 489 } 490 491 jvmtiError 492 JvmtiExport::add_module_opens(Handle module, Handle pkg_name, Handle to_module, TRAPS) { 493 if (!Universe::is_module_initialized()) { 494 return JVMTI_ERROR_NONE; // extra safety 495 } 496 assert(!module.is_null(), "module should always be set"); 497 assert(!to_module.is_null(), "to_module should always be set"); 498 assert(!pkg_name.is_null(), "pkg_name should always be set"); 499 500 // Invoke the addOpens method 501 JavaValue result(T_VOID); 502 JavaCalls::call_static(&result, 503 SystemDictionary::module_Modules_klass(), 504 vmSymbols::addOpens_name(), 505 vmSymbols::addExports_signature(), 506 module, 507 pkg_name, 508 to_module, 509 THREAD); 510 511 if (HAS_PENDING_EXCEPTION) { 512 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); 513 LogTarget(Trace, jvmti) log; 514 LogStream log_stream(log); 515 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 516 log_stream.cr(); 517 CLEAR_PENDING_EXCEPTION; 518 if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) { 519 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 520 } 521 return JVMTI_ERROR_INTERNAL; 522 } 523 return JVMTI_ERROR_NONE; 524 } 525 526 jvmtiError 527 JvmtiExport::add_module_uses(Handle module, Handle service, TRAPS) { 528 if (!Universe::is_module_initialized()) { 529 return JVMTI_ERROR_NONE; // extra safety 530 } 531 assert(!module.is_null(), "module should always be set"); 532 assert(!service.is_null(), "service should always be set"); 533 534 // Invoke the addUses method 535 JavaValue result(T_VOID); 536 JavaCalls::call_static(&result, 537 SystemDictionary::module_Modules_klass(), 538 vmSymbols::addUses_name(), 539 vmSymbols::addUses_signature(), 540 module, 541 service, 542 THREAD); 543 544 if (HAS_PENDING_EXCEPTION) { 545 LogTarget(Trace, jvmti) log; 546 LogStream log_stream(log); 547 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 548 log_stream.cr(); 549 CLEAR_PENDING_EXCEPTION; 550 return JVMTI_ERROR_INTERNAL; 551 } 552 return JVMTI_ERROR_NONE; 553 } 554 555 jvmtiError 556 JvmtiExport::add_module_provides(Handle module, Handle service, Handle impl_class, TRAPS) { 557 if (!Universe::is_module_initialized()) { 558 return JVMTI_ERROR_NONE; // extra safety 559 } 560 assert(!module.is_null(), "module should always be set"); 561 assert(!service.is_null(), "service should always be set"); 562 assert(!impl_class.is_null(), "impl_class should always be set"); 563 564 // Invoke the addProvides method 565 JavaValue result(T_VOID); 566 JavaCalls::call_static(&result, 567 SystemDictionary::module_Modules_klass(), 568 vmSymbols::addProvides_name(), 569 vmSymbols::addProvides_signature(), 570 module, 571 service, 572 impl_class, 573 THREAD); 574 575 if (HAS_PENDING_EXCEPTION) { 576 LogTarget(Trace, jvmti) log; 577 LogStream log_stream(log); 578 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 579 log_stream.cr(); 580 CLEAR_PENDING_EXCEPTION; 581 return JVMTI_ERROR_INTERNAL; 582 } 583 return JVMTI_ERROR_NONE; 584 } 585 586 void 587 JvmtiExport::decode_version_values(jint version, int * major, int * minor, 588 int * micro) { 589 *major = (version & JVMTI_VERSION_MASK_MAJOR) >> JVMTI_VERSION_SHIFT_MAJOR; 590 *minor = (version & JVMTI_VERSION_MASK_MINOR) >> JVMTI_VERSION_SHIFT_MINOR; 591 *micro = (version & JVMTI_VERSION_MASK_MICRO) >> JVMTI_VERSION_SHIFT_MICRO; 592 } 593 594 void JvmtiExport::enter_primordial_phase() { 595 JvmtiEnvBase::set_phase(JVMTI_PHASE_PRIMORDIAL); 596 } 597 598 void JvmtiExport::enter_early_start_phase() { 599 JvmtiManageCapabilities::recompute_always_capabilities(); 600 set_early_vmstart_recorded(true); 601 } 602 603 void JvmtiExport::enter_start_phase() { 604 JvmtiManageCapabilities::recompute_always_capabilities(); 605 JvmtiEnvBase::set_phase(JVMTI_PHASE_START); 606 } 607 608 void JvmtiExport::enter_onload_phase() { 609 JvmtiEnvBase::set_phase(JVMTI_PHASE_ONLOAD); 610 } 611 612 void JvmtiExport::enter_live_phase() { 613 JvmtiEnvBase::set_phase(JVMTI_PHASE_LIVE); 614 } 615 616 // 617 // JVMTI events that the VM posts to the debugger and also startup agent 618 // and call the agent's premain() for java.lang.instrument. 619 // 620 621 void JvmtiExport::post_early_vm_start() { 622 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg Early VM start event triggered" )); 623 624 // can now enable some events 625 JvmtiEventController::vm_start(); 626 627 JvmtiEnvIterator it; 628 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 629 // Only early vmstart envs post early VMStart event 630 if (env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) { 631 EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt Early VM start event sent" )); 632 JavaThread *thread = JavaThread::current(); 633 JvmtiThreadEventMark jem(thread); 634 JvmtiJavaThreadEventTransition jet(thread); 635 jvmtiEventVMStart callback = env->callbacks()->VMStart; 636 if (callback != NULL) { 637 (*callback)(env->jvmti_external(), jem.jni_env()); 638 } 639 } 640 } 641 } 642 643 void JvmtiExport::post_vm_start() { 644 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg VM start event triggered" )); 645 646 // can now enable some events 647 JvmtiEventController::vm_start(); 648 649 JvmtiEnvIterator it; 650 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 651 // Early vmstart envs do not post normal VMStart event 652 if (!env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) { 653 EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt VM start event sent" )); 654 655 JavaThread *thread = JavaThread::current(); 656 JvmtiThreadEventMark jem(thread); 657 JvmtiJavaThreadEventTransition jet(thread); 658 jvmtiEventVMStart callback = env->callbacks()->VMStart; 659 if (callback != NULL) { 660 (*callback)(env->jvmti_external(), jem.jni_env()); 661 } 662 } 663 } 664 } 665 666 667 void JvmtiExport::post_vm_initialized() { 668 EVT_TRIG_TRACE(JVMTI_EVENT_VM_INIT, ("Trg VM init event triggered" )); 669 670 // can now enable events 671 JvmtiEventController::vm_init(); 672 673 JvmtiEnvIterator it; 674 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 675 if (env->is_enabled(JVMTI_EVENT_VM_INIT)) { 676 EVT_TRACE(JVMTI_EVENT_VM_INIT, ("Evt VM init event sent" )); 677 678 JavaThread *thread = JavaThread::current(); 679 JvmtiThreadEventMark jem(thread); 680 JvmtiJavaThreadEventTransition jet(thread); 681 jvmtiEventVMInit callback = env->callbacks()->VMInit; 682 if (callback != NULL) { 683 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread()); 684 } 685 } 686 } 687 } 688 689 690 void JvmtiExport::post_vm_death() { 691 EVT_TRIG_TRACE(JVMTI_EVENT_VM_DEATH, ("Trg VM death event triggered" )); 692 693 JvmtiEnvIterator it; 694 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 695 if (env->is_enabled(JVMTI_EVENT_VM_DEATH)) { 696 EVT_TRACE(JVMTI_EVENT_VM_DEATH, ("Evt VM death event sent" )); 697 698 JavaThread *thread = JavaThread::current(); 699 JvmtiEventMark jem(thread); 700 JvmtiJavaThreadEventTransition jet(thread); 701 jvmtiEventVMDeath callback = env->callbacks()->VMDeath; 702 if (callback != NULL) { 703 (*callback)(env->jvmti_external(), jem.jni_env()); 704 } 705 } 706 } 707 708 JvmtiEnvBase::set_phase(JVMTI_PHASE_DEAD); 709 JvmtiEventController::vm_death(); 710 } 711 712 char** 713 JvmtiExport::get_all_native_method_prefixes(int* count_ptr) { 714 // Have to grab JVMTI thread state lock to be sure environment doesn't 715 // go away while we iterate them. No locks during VM bring-up. 716 if (Threads::number_of_threads() == 0 || SafepointSynchronize::is_at_safepoint()) { 717 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr); 718 } else { 719 MutexLocker mu(JvmtiThreadState_lock); 720 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr); 721 } 722 } 723 724 class JvmtiClassFileLoadHookPoster : public StackObj { 725 private: 726 Symbol* _h_name; 727 Handle _class_loader; 728 Handle _h_protection_domain; 729 unsigned char ** _data_ptr; 730 unsigned char ** _end_ptr; 731 JavaThread * _thread; 732 jint _curr_len; 733 unsigned char * _curr_data; 734 JvmtiEnv * _curr_env; 735 JvmtiCachedClassFileData ** _cached_class_file_ptr; 736 JvmtiThreadState * _state; 737 Klass* _class_being_redefined; 738 JvmtiClassLoadKind _load_kind; 739 bool _has_been_modified; 740 741 public: 742 inline JvmtiClassFileLoadHookPoster(Symbol* h_name, Handle class_loader, 743 Handle h_protection_domain, 744 unsigned char **data_ptr, unsigned char **end_ptr, 745 JvmtiCachedClassFileData **cache_ptr) { 746 _h_name = h_name; 747 _class_loader = class_loader; 748 _h_protection_domain = h_protection_domain; 749 _data_ptr = data_ptr; 750 _end_ptr = end_ptr; 751 _thread = JavaThread::current(); 752 _curr_len = *end_ptr - *data_ptr; 753 _curr_data = *data_ptr; 754 _curr_env = NULL; 755 _cached_class_file_ptr = cache_ptr; 756 _has_been_modified = false; 757 758 _state = _thread->jvmti_thread_state(); 759 if (_state != NULL) { 760 _class_being_redefined = _state->get_class_being_redefined(); 761 _load_kind = _state->get_class_load_kind(); 762 Klass* klass = (_class_being_redefined == NULL) ? NULL : _class_being_redefined; 763 if (_load_kind != jvmti_class_load_kind_load && klass != NULL) { 764 ModuleEntry* module_entry = InstanceKlass::cast(klass)->module(); 765 assert(module_entry != NULL, "module_entry should always be set"); 766 if (module_entry->is_named() && 767 module_entry->module() != NULL && 768 !module_entry->has_default_read_edges()) { 769 if (!module_entry->set_has_default_read_edges()) { 770 // We won a potential race. 771 // Add read edges to the unnamed modules of the bootstrap and app class loaders 772 Handle class_module(_thread, module_entry->module()); // Obtain j.l.r.Module 773 JvmtiExport::add_default_read_edges(class_module, _thread); 774 } 775 } 776 } 777 // Clear class_being_redefined flag here. The action 778 // from agent handler could generate a new class file load 779 // hook event and if it is not cleared the new event generated 780 // from regular class file load could have this stale redefined 781 // class handle info. 782 _state->clear_class_being_redefined(); 783 } else { 784 // redefine and retransform will always set the thread state 785 _class_being_redefined = NULL; 786 _load_kind = jvmti_class_load_kind_load; 787 } 788 } 789 790 void post() { 791 post_all_envs(); 792 copy_modified_data(); 793 } 794 795 bool has_been_modified() { return _has_been_modified; } 796 797 private: 798 void post_all_envs() { 799 if (_load_kind != jvmti_class_load_kind_retransform) { 800 // for class load and redefine, 801 // call the non-retransformable agents 802 JvmtiEnvIterator it; 803 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 804 if (!env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) { 805 // non-retransformable agents cannot retransform back, 806 // so no need to cache the original class file bytes 807 post_to_env(env, false); 808 } 809 } 810 } 811 JvmtiEnvIterator it; 812 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 813 // retransformable agents get all events 814 if (env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) { 815 // retransformable agents need to cache the original class file 816 // bytes if changes are made via the ClassFileLoadHook 817 post_to_env(env, true); 818 } 819 } 820 } 821 822 void post_to_env(JvmtiEnv* env, bool caching_needed) { 823 if (env->phase() == JVMTI_PHASE_PRIMORDIAL && !env->early_class_hook_env()) { 824 return; 825 } 826 unsigned char *new_data = NULL; 827 jint new_len = 0; 828 JvmtiClassFileLoadEventMark jem(_thread, _h_name, _class_loader, 829 _h_protection_domain, 830 _class_being_redefined); 831 JvmtiJavaThreadEventTransition jet(_thread); 832 jvmtiEventClassFileLoadHook callback = env->callbacks()->ClassFileLoadHook; 833 if (callback != NULL) { 834 (*callback)(env->jvmti_external(), jem.jni_env(), 835 jem.class_being_redefined(), 836 jem.jloader(), jem.class_name(), 837 jem.protection_domain(), 838 _curr_len, _curr_data, 839 &new_len, &new_data); 840 } 841 if (new_data != NULL) { 842 // this agent has modified class data. 843 _has_been_modified = true; 844 if (caching_needed && *_cached_class_file_ptr == NULL) { 845 // data has been changed by the new retransformable agent 846 // and it hasn't already been cached, cache it 847 JvmtiCachedClassFileData *p; 848 p = (JvmtiCachedClassFileData *)os::malloc( 849 offset_of(JvmtiCachedClassFileData, data) + _curr_len, mtInternal); 850 if (p == NULL) { 851 vm_exit_out_of_memory(offset_of(JvmtiCachedClassFileData, data) + _curr_len, 852 OOM_MALLOC_ERROR, 853 "unable to allocate cached copy of original class bytes"); 854 } 855 p->length = _curr_len; 856 memcpy(p->data, _curr_data, _curr_len); 857 *_cached_class_file_ptr = p; 858 } 859 860 if (_curr_data != *_data_ptr) { 861 // curr_data is previous agent modified class data. 862 // And this has been changed by the new agent so 863 // we can delete it now. 864 _curr_env->Deallocate(_curr_data); 865 } 866 867 // Class file data has changed by the current agent. 868 _curr_data = new_data; 869 _curr_len = new_len; 870 // Save the current agent env we need this to deallocate the 871 // memory allocated by this agent. 872 _curr_env = env; 873 } 874 } 875 876 void copy_modified_data() { 877 // if one of the agent has modified class file data. 878 // Copy modified class data to new resources array. 879 if (_curr_data != *_data_ptr) { 880 *_data_ptr = NEW_RESOURCE_ARRAY(u1, _curr_len); 881 memcpy(*_data_ptr, _curr_data, _curr_len); 882 *_end_ptr = *_data_ptr + _curr_len; 883 _curr_env->Deallocate(_curr_data); 884 } 885 } 886 }; 887 888 bool JvmtiExport::_should_post_class_file_load_hook = false; 889 890 // this entry is for class file load hook on class load, redefine and retransform 891 bool JvmtiExport::post_class_file_load_hook(Symbol* h_name, 892 Handle class_loader, 893 Handle h_protection_domain, 894 unsigned char **data_ptr, 895 unsigned char **end_ptr, 896 JvmtiCachedClassFileData **cache_ptr) { 897 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 898 return false; 899 } 900 901 JvmtiClassFileLoadHookPoster poster(h_name, class_loader, 902 h_protection_domain, 903 data_ptr, end_ptr, 904 cache_ptr); 905 poster.post(); 906 return poster.has_been_modified(); 907 } 908 909 void JvmtiExport::report_unsupported(bool on) { 910 // If any JVMTI service is turned on, we need to exit before native code 911 // tries to access nonexistant services. 912 if (on) { 913 vm_exit_during_initialization("Java Kernel does not support JVMTI."); 914 } 915 } 916 917 918 static inline Klass* oop_to_klass(oop obj) { 919 Klass* k = obj->klass(); 920 921 // if the object is a java.lang.Class then return the java mirror 922 if (k == SystemDictionary::Class_klass()) { 923 if (!java_lang_Class::is_primitive(obj)) { 924 k = java_lang_Class::as_Klass(obj); 925 assert(k != NULL, "class for non-primitive mirror must exist"); 926 } 927 } 928 return k; 929 } 930 931 class JvmtiVMObjectAllocEventMark : public JvmtiClassEventMark { 932 private: 933 jobject _jobj; 934 jlong _size; 935 public: 936 JvmtiVMObjectAllocEventMark(JavaThread *thread, oop obj) : JvmtiClassEventMark(thread, oop_to_klass(obj)) { 937 _jobj = (jobject)to_jobject(obj); 938 _size = obj->size() * wordSize; 939 }; 940 jobject jni_jobject() { return _jobj; } 941 jlong size() { return _size; } 942 }; 943 944 class JvmtiCompiledMethodLoadEventMark : public JvmtiMethodEventMark { 945 private: 946 jint _code_size; 947 const void *_code_data; 948 jint _map_length; 949 jvmtiAddrLocationMap *_map; 950 const void *_compile_info; 951 public: 952 JvmtiCompiledMethodLoadEventMark(JavaThread *thread, nmethod *nm, void* compile_info_ptr = NULL) 953 : JvmtiMethodEventMark(thread,methodHandle(thread, nm->method())) { 954 _code_data = nm->insts_begin(); 955 _code_size = nm->insts_size(); 956 _compile_info = compile_info_ptr; // Set void pointer of compiledMethodLoad Event. Default value is NULL. 957 JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nm, &_map, &_map_length); 958 } 959 ~JvmtiCompiledMethodLoadEventMark() { 960 FREE_C_HEAP_ARRAY(jvmtiAddrLocationMap, _map); 961 } 962 963 jint code_size() { return _code_size; } 964 const void *code_data() { return _code_data; } 965 jint map_length() { return _map_length; } 966 const jvmtiAddrLocationMap* map() { return _map; } 967 const void *compile_info() { return _compile_info; } 968 }; 969 970 971 972 class JvmtiMonitorEventMark : public JvmtiThreadEventMark { 973 private: 974 jobject _jobj; 975 public: 976 JvmtiMonitorEventMark(JavaThread *thread, oop object) 977 : JvmtiThreadEventMark(thread){ 978 _jobj = to_jobject(object); 979 } 980 jobject jni_object() { return _jobj; } 981 }; 982 983 /////////////////////////////////////////////////////////////// 984 // 985 // pending CompiledMethodUnload support 986 // 987 988 void JvmtiExport::post_compiled_method_unload( 989 jmethodID method, const void *code_begin) { 990 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 991 return; 992 } 993 JavaThread* thread = JavaThread::current(); 994 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD, 995 ("[%s] method compile unload event triggered", 996 JvmtiTrace::safe_get_thread_name(thread))); 997 998 // post the event for each environment that has this event enabled. 999 JvmtiEnvIterator it; 1000 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1001 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_UNLOAD)) { 1002 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1003 continue; 1004 } 1005 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD, 1006 ("[%s] class compile method unload event sent jmethodID " PTR_FORMAT, 1007 JvmtiTrace::safe_get_thread_name(thread), p2i(method))); 1008 1009 ResourceMark rm(thread); 1010 1011 JvmtiEventMark jem(thread); 1012 JvmtiJavaThreadEventTransition jet(thread); 1013 jvmtiEventCompiledMethodUnload callback = env->callbacks()->CompiledMethodUnload; 1014 if (callback != NULL) { 1015 (*callback)(env->jvmti_external(), method, code_begin); 1016 } 1017 } 1018 } 1019 } 1020 1021 /////////////////////////////////////////////////////////////// 1022 // 1023 // JvmtiExport 1024 // 1025 1026 void JvmtiExport::post_raw_breakpoint(JavaThread *thread, Method* method, address location) { 1027 HandleMark hm(thread); 1028 methodHandle mh(thread, method); 1029 1030 JvmtiThreadState *state = thread->jvmti_thread_state(); 1031 if (state == NULL) { 1032 return; 1033 } 1034 EVT_TRIG_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Trg Breakpoint triggered", 1035 JvmtiTrace::safe_get_thread_name(thread))); 1036 JvmtiEnvThreadStateIterator it(state); 1037 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1038 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_BREAKPOINT); 1039 if (!ets->breakpoint_posted() && ets->is_enabled(JVMTI_EVENT_BREAKPOINT)) { 1040 ThreadState old_os_state = thread->osthread()->get_state(); 1041 thread->osthread()->set_state(BREAKPOINTED); 1042 EVT_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Evt Breakpoint sent %s.%s @ " INTX_FORMAT, 1043 JvmtiTrace::safe_get_thread_name(thread), 1044 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1045 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1046 location - mh()->code_base() )); 1047 1048 JvmtiEnv *env = ets->get_env(); 1049 JvmtiLocationEventMark jem(thread, mh, location); 1050 JvmtiJavaThreadEventTransition jet(thread); 1051 jvmtiEventBreakpoint callback = env->callbacks()->Breakpoint; 1052 if (callback != NULL) { 1053 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1054 jem.jni_methodID(), jem.location()); 1055 } 1056 1057 ets->set_breakpoint_posted(); 1058 thread->osthread()->set_state(old_os_state); 1059 } 1060 } 1061 } 1062 1063 ////////////////////////////////////////////////////////////////////////////// 1064 1065 bool JvmtiExport::_can_get_source_debug_extension = false; 1066 bool JvmtiExport::_can_maintain_original_method_order = false; 1067 bool JvmtiExport::_can_post_interpreter_events = false; 1068 bool JvmtiExport::_can_post_on_exceptions = false; 1069 bool JvmtiExport::_can_post_breakpoint = false; 1070 bool JvmtiExport::_can_post_field_access = false; 1071 bool JvmtiExport::_can_post_field_modification = false; 1072 bool JvmtiExport::_can_post_method_entry = false; 1073 bool JvmtiExport::_can_post_method_exit = false; 1074 bool JvmtiExport::_can_pop_frame = false; 1075 bool JvmtiExport::_can_force_early_return = false; 1076 1077 bool JvmtiExport::_early_vmstart_recorded = false; 1078 1079 bool JvmtiExport::_should_post_single_step = false; 1080 bool JvmtiExport::_should_post_field_access = false; 1081 bool JvmtiExport::_should_post_field_modification = false; 1082 bool JvmtiExport::_should_post_class_load = false; 1083 bool JvmtiExport::_should_post_class_prepare = false; 1084 bool JvmtiExport::_should_post_class_unload = false; 1085 bool JvmtiExport::_should_post_thread_life = false; 1086 bool JvmtiExport::_should_clean_up_heap_objects = false; 1087 bool JvmtiExport::_should_post_native_method_bind = false; 1088 bool JvmtiExport::_should_post_dynamic_code_generated = false; 1089 bool JvmtiExport::_should_post_data_dump = false; 1090 bool JvmtiExport::_should_post_compiled_method_load = false; 1091 bool JvmtiExport::_should_post_compiled_method_unload = false; 1092 bool JvmtiExport::_should_post_monitor_contended_enter = false; 1093 bool JvmtiExport::_should_post_monitor_contended_entered = false; 1094 bool JvmtiExport::_should_post_monitor_wait = false; 1095 bool JvmtiExport::_should_post_monitor_waited = false; 1096 bool JvmtiExport::_should_post_garbage_collection_start = false; 1097 bool JvmtiExport::_should_post_garbage_collection_finish = false; 1098 bool JvmtiExport::_should_post_object_free = false; 1099 bool JvmtiExport::_should_post_resource_exhausted = false; 1100 bool JvmtiExport::_should_post_vm_object_alloc = false; 1101 bool JvmtiExport::_should_post_on_exceptions = false; 1102 1103 //////////////////////////////////////////////////////////////////////////////////////////////// 1104 1105 1106 // 1107 // JVMTI single step management 1108 // 1109 void JvmtiExport::at_single_stepping_point(JavaThread *thread, Method* method, address location) { 1110 assert(JvmtiExport::should_post_single_step(), "must be single stepping"); 1111 1112 HandleMark hm(thread); 1113 methodHandle mh(thread, method); 1114 1115 // update information about current location and post a step event 1116 JvmtiThreadState *state = thread->jvmti_thread_state(); 1117 if (state == NULL) { 1118 return; 1119 } 1120 EVT_TRIG_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Trg Single Step triggered", 1121 JvmtiTrace::safe_get_thread_name(thread))); 1122 if (!state->hide_single_stepping()) { 1123 if (state->is_pending_step_for_popframe()) { 1124 state->process_pending_step_for_popframe(); 1125 } 1126 if (state->is_pending_step_for_earlyret()) { 1127 state->process_pending_step_for_earlyret(); 1128 } 1129 JvmtiExport::post_single_step(thread, mh(), location); 1130 } 1131 } 1132 1133 1134 void JvmtiExport::expose_single_stepping(JavaThread *thread) { 1135 JvmtiThreadState *state = thread->jvmti_thread_state(); 1136 if (state != NULL) { 1137 state->clear_hide_single_stepping(); 1138 } 1139 } 1140 1141 1142 bool JvmtiExport::hide_single_stepping(JavaThread *thread) { 1143 JvmtiThreadState *state = thread->jvmti_thread_state(); 1144 if (state != NULL && state->is_enabled(JVMTI_EVENT_SINGLE_STEP)) { 1145 state->set_hide_single_stepping(); 1146 return true; 1147 } else { 1148 return false; 1149 } 1150 } 1151 1152 void JvmtiExport::post_class_load(JavaThread *thread, Klass* klass) { 1153 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1154 return; 1155 } 1156 HandleMark hm(thread); 1157 1158 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Trg Class Load triggered", 1159 JvmtiTrace::safe_get_thread_name(thread))); 1160 JvmtiThreadState* state = thread->jvmti_thread_state(); 1161 if (state == NULL) { 1162 return; 1163 } 1164 JvmtiEnvThreadStateIterator it(state); 1165 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1166 if (ets->is_enabled(JVMTI_EVENT_CLASS_LOAD)) { 1167 JvmtiEnv *env = ets->get_env(); 1168 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1169 continue; 1170 } 1171 EVT_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Evt Class Load sent %s", 1172 JvmtiTrace::safe_get_thread_name(thread), 1173 klass==NULL? "NULL" : klass->external_name() )); 1174 JvmtiClassEventMark jem(thread, klass); 1175 JvmtiJavaThreadEventTransition jet(thread); 1176 jvmtiEventClassLoad callback = env->callbacks()->ClassLoad; 1177 if (callback != NULL) { 1178 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class()); 1179 } 1180 } 1181 } 1182 } 1183 1184 1185 void JvmtiExport::post_class_prepare(JavaThread *thread, Klass* klass) { 1186 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1187 return; 1188 } 1189 HandleMark hm(thread); 1190 1191 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Trg Class Prepare triggered", 1192 JvmtiTrace::safe_get_thread_name(thread))); 1193 JvmtiThreadState* state = thread->jvmti_thread_state(); 1194 if (state == NULL) { 1195 return; 1196 } 1197 JvmtiEnvThreadStateIterator it(state); 1198 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1199 if (ets->is_enabled(JVMTI_EVENT_CLASS_PREPARE)) { 1200 JvmtiEnv *env = ets->get_env(); 1201 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1202 continue; 1203 } 1204 EVT_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Evt Class Prepare sent %s", 1205 JvmtiTrace::safe_get_thread_name(thread), 1206 klass==NULL? "NULL" : klass->external_name() )); 1207 JvmtiClassEventMark jem(thread, klass); 1208 JvmtiJavaThreadEventTransition jet(thread); 1209 jvmtiEventClassPrepare callback = env->callbacks()->ClassPrepare; 1210 if (callback != NULL) { 1211 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class()); 1212 } 1213 } 1214 } 1215 } 1216 1217 void JvmtiExport::post_class_unload(Klass* klass) { 1218 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1219 return; 1220 } 1221 Thread *thread = Thread::current(); 1222 HandleMark hm(thread); 1223 1224 EVT_TRIG_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Trg Class Unload triggered" )); 1225 if (JvmtiEventController::is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) { 1226 assert(thread->is_VM_thread(), "wrong thread"); 1227 1228 // get JavaThread for whom we are proxy 1229 Thread *calling_thread = ((VMThread *)thread)->vm_operation()->calling_thread(); 1230 if (!calling_thread->is_Java_thread()) { 1231 // cannot post an event to a non-JavaThread 1232 return; 1233 } 1234 JavaThread *real_thread = (JavaThread *)calling_thread; 1235 1236 JvmtiEnvIterator it; 1237 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1238 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1239 continue; 1240 } 1241 if (env->is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) { 1242 EVT_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Evt Class Unload sent %s", 1243 klass==NULL? "NULL" : klass->external_name() )); 1244 1245 // do everything manually, since this is a proxy - needs special care 1246 JNIEnv* jni_env = real_thread->jni_environment(); 1247 jthread jt = (jthread)JNIHandles::make_local(real_thread, real_thread->threadObj()); 1248 jclass jk = (jclass)JNIHandles::make_local(real_thread, klass->java_mirror()); 1249 1250 // Before we call the JVMTI agent, we have to set the state in the 1251 // thread for which we are proxying. 1252 JavaThreadState prev_state = real_thread->thread_state(); 1253 assert(((Thread *)real_thread)->is_ConcurrentGC_thread() || 1254 (real_thread->is_Java_thread() && prev_state == _thread_blocked), 1255 "should be ConcurrentGCThread or JavaThread at safepoint"); 1256 real_thread->set_thread_state(_thread_in_native); 1257 1258 jvmtiExtensionEvent callback = env->ext_callbacks()->ClassUnload; 1259 if (callback != NULL) { 1260 (*callback)(env->jvmti_external(), jni_env, jt, jk); 1261 } 1262 1263 assert(real_thread->thread_state() == _thread_in_native, 1264 "JavaThread should be in native"); 1265 real_thread->set_thread_state(prev_state); 1266 1267 JNIHandles::destroy_local(jk); 1268 JNIHandles::destroy_local(jt); 1269 } 1270 } 1271 } 1272 } 1273 1274 1275 void JvmtiExport::post_thread_start(JavaThread *thread) { 1276 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1277 return; 1278 } 1279 assert(thread->thread_state() == _thread_in_vm, "must be in vm state"); 1280 1281 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Trg Thread Start event triggered", 1282 JvmtiTrace::safe_get_thread_name(thread))); 1283 1284 // do JVMTI thread initialization (if needed) 1285 JvmtiEventController::thread_started(thread); 1286 1287 // Do not post thread start event for hidden java thread. 1288 if (JvmtiEventController::is_enabled(JVMTI_EVENT_THREAD_START) && 1289 !thread->is_hidden_from_external_view()) { 1290 JvmtiEnvIterator it; 1291 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1292 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1293 continue; 1294 } 1295 if (env->is_enabled(JVMTI_EVENT_THREAD_START)) { 1296 EVT_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Evt Thread Start event sent", 1297 JvmtiTrace::safe_get_thread_name(thread) )); 1298 1299 JvmtiThreadEventMark jem(thread); 1300 JvmtiJavaThreadEventTransition jet(thread); 1301 jvmtiEventThreadStart callback = env->callbacks()->ThreadStart; 1302 if (callback != NULL) { 1303 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread()); 1304 } 1305 } 1306 } 1307 } 1308 } 1309 1310 1311 void JvmtiExport::post_thread_end(JavaThread *thread) { 1312 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1313 return; 1314 } 1315 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Trg Thread End event triggered", 1316 JvmtiTrace::safe_get_thread_name(thread))); 1317 1318 JvmtiThreadState *state = thread->jvmti_thread_state(); 1319 if (state == NULL) { 1320 return; 1321 } 1322 1323 // Do not post thread end event for hidden java thread. 1324 if (state->is_enabled(JVMTI_EVENT_THREAD_END) && 1325 !thread->is_hidden_from_external_view()) { 1326 1327 JvmtiEnvThreadStateIterator it(state); 1328 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1329 if (ets->is_enabled(JVMTI_EVENT_THREAD_END)) { 1330 JvmtiEnv *env = ets->get_env(); 1331 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1332 continue; 1333 } 1334 EVT_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Evt Thread End event sent", 1335 JvmtiTrace::safe_get_thread_name(thread) )); 1336 1337 JvmtiThreadEventMark jem(thread); 1338 JvmtiJavaThreadEventTransition jet(thread); 1339 jvmtiEventThreadEnd callback = env->callbacks()->ThreadEnd; 1340 if (callback != NULL) { 1341 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread()); 1342 } 1343 } 1344 } 1345 } 1346 } 1347 1348 void JvmtiExport::post_object_free(JvmtiEnv* env, jlong tag) { 1349 assert(SafepointSynchronize::is_at_safepoint(), "must be executed at safepoint"); 1350 assert(env->is_enabled(JVMTI_EVENT_OBJECT_FREE), "checking"); 1351 1352 EVT_TRIG_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Trg Object Free triggered" )); 1353 EVT_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Evt Object Free sent")); 1354 1355 jvmtiEventObjectFree callback = env->callbacks()->ObjectFree; 1356 if (callback != NULL) { 1357 (*callback)(env->jvmti_external(), tag); 1358 } 1359 } 1360 1361 void JvmtiExport::post_resource_exhausted(jint resource_exhausted_flags, const char* description) { 1362 EVT_TRIG_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Trg resource exhausted event triggered" )); 1363 1364 JvmtiEnvIterator it; 1365 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1366 if (env->is_enabled(JVMTI_EVENT_RESOURCE_EXHAUSTED)) { 1367 EVT_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Evt resource exhausted event sent" )); 1368 1369 JavaThread *thread = JavaThread::current(); 1370 JvmtiThreadEventMark jem(thread); 1371 JvmtiJavaThreadEventTransition jet(thread); 1372 jvmtiEventResourceExhausted callback = env->callbacks()->ResourceExhausted; 1373 if (callback != NULL) { 1374 (*callback)(env->jvmti_external(), jem.jni_env(), 1375 resource_exhausted_flags, NULL, description); 1376 } 1377 } 1378 } 1379 } 1380 1381 void JvmtiExport::post_method_entry(JavaThread *thread, Method* method, frame current_frame) { 1382 HandleMark hm(thread); 1383 methodHandle mh(thread, method); 1384 1385 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Trg Method Entry triggered %s.%s", 1386 JvmtiTrace::safe_get_thread_name(thread), 1387 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1388 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1389 1390 JvmtiThreadState* state = thread->jvmti_thread_state(); 1391 if (state == NULL || !state->is_interp_only_mode()) { 1392 // for any thread that actually wants method entry, interp_only_mode is set 1393 return; 1394 } 1395 1396 state->incr_cur_stack_depth(); 1397 1398 if (state->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) { 1399 JvmtiEnvThreadStateIterator it(state); 1400 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1401 if (ets->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) { 1402 EVT_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Evt Method Entry sent %s.%s", 1403 JvmtiTrace::safe_get_thread_name(thread), 1404 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1405 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1406 1407 JvmtiEnv *env = ets->get_env(); 1408 JvmtiMethodEventMark jem(thread, mh); 1409 JvmtiJavaThreadEventTransition jet(thread); 1410 jvmtiEventMethodEntry callback = env->callbacks()->MethodEntry; 1411 if (callback != NULL) { 1412 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_methodID()); 1413 } 1414 } 1415 } 1416 } 1417 } 1418 1419 void JvmtiExport::post_method_exit(JavaThread *thread, Method* method, frame current_frame) { 1420 HandleMark hm(thread); 1421 methodHandle mh(thread, method); 1422 1423 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Trg Method Exit triggered %s.%s", 1424 JvmtiTrace::safe_get_thread_name(thread), 1425 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1426 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1427 1428 JvmtiThreadState *state = thread->jvmti_thread_state(); 1429 if (state == NULL || !state->is_interp_only_mode()) { 1430 // for any thread that actually wants method exit, interp_only_mode is set 1431 return; 1432 } 1433 1434 // return a flag when a method terminates by throwing an exception 1435 // i.e. if an exception is thrown and it's not caught by the current method 1436 bool exception_exit = state->is_exception_detected() && !state->is_exception_caught(); 1437 1438 1439 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) { 1440 Handle result; 1441 jvalue value; 1442 value.j = 0L; 1443 1444 // if the method hasn't been popped because of an exception then we populate 1445 // the return_value parameter for the callback. At this point we only have 1446 // the address of a "raw result" and we just call into the interpreter to 1447 // convert this into a jvalue. 1448 if (!exception_exit) { 1449 oop oop_result; 1450 BasicType type = current_frame.interpreter_frame_result(&oop_result, &value); 1451 if (type == T_OBJECT || type == T_ARRAY) { 1452 result = Handle(thread, oop_result); 1453 } 1454 } 1455 1456 JvmtiEnvThreadStateIterator it(state); 1457 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1458 if (ets->is_enabled(JVMTI_EVENT_METHOD_EXIT)) { 1459 EVT_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Evt Method Exit sent %s.%s", 1460 JvmtiTrace::safe_get_thread_name(thread), 1461 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1462 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1463 1464 JvmtiEnv *env = ets->get_env(); 1465 JvmtiMethodEventMark jem(thread, mh); 1466 if (result.not_null()) { 1467 value.l = JNIHandles::make_local(thread, result()); 1468 } 1469 JvmtiJavaThreadEventTransition jet(thread); 1470 jvmtiEventMethodExit callback = env->callbacks()->MethodExit; 1471 if (callback != NULL) { 1472 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1473 jem.jni_methodID(), exception_exit, value); 1474 } 1475 } 1476 } 1477 } 1478 1479 if (state->is_enabled(JVMTI_EVENT_FRAME_POP)) { 1480 JvmtiEnvThreadStateIterator it(state); 1481 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1482 int cur_frame_number = state->cur_stack_depth(); 1483 1484 if (ets->is_frame_pop(cur_frame_number)) { 1485 // we have a NotifyFramePop entry for this frame. 1486 // now check that this env/thread wants this event 1487 if (ets->is_enabled(JVMTI_EVENT_FRAME_POP)) { 1488 EVT_TRACE(JVMTI_EVENT_FRAME_POP, ("[%s] Evt Frame Pop sent %s.%s", 1489 JvmtiTrace::safe_get_thread_name(thread), 1490 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1491 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1492 1493 // we also need to issue a frame pop event for this frame 1494 JvmtiEnv *env = ets->get_env(); 1495 JvmtiMethodEventMark jem(thread, mh); 1496 JvmtiJavaThreadEventTransition jet(thread); 1497 jvmtiEventFramePop callback = env->callbacks()->FramePop; 1498 if (callback != NULL) { 1499 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1500 jem.jni_methodID(), exception_exit); 1501 } 1502 } 1503 // remove the frame's entry 1504 ets->clear_frame_pop(cur_frame_number); 1505 } 1506 } 1507 } 1508 1509 state->decr_cur_stack_depth(); 1510 } 1511 1512 1513 // Todo: inline this for optimization 1514 void JvmtiExport::post_single_step(JavaThread *thread, Method* method, address location) { 1515 HandleMark hm(thread); 1516 methodHandle mh(thread, method); 1517 1518 JvmtiThreadState *state = thread->jvmti_thread_state(); 1519 if (state == NULL) { 1520 return; 1521 } 1522 JvmtiEnvThreadStateIterator it(state); 1523 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1524 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_SINGLE_STEP); 1525 if (!ets->single_stepping_posted() && ets->is_enabled(JVMTI_EVENT_SINGLE_STEP)) { 1526 EVT_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Evt Single Step sent %s.%s @ " INTX_FORMAT, 1527 JvmtiTrace::safe_get_thread_name(thread), 1528 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1529 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1530 location - mh()->code_base() )); 1531 1532 JvmtiEnv *env = ets->get_env(); 1533 JvmtiLocationEventMark jem(thread, mh, location); 1534 JvmtiJavaThreadEventTransition jet(thread); 1535 jvmtiEventSingleStep callback = env->callbacks()->SingleStep; 1536 if (callback != NULL) { 1537 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1538 jem.jni_methodID(), jem.location()); 1539 } 1540 1541 ets->set_single_stepping_posted(); 1542 } 1543 } 1544 } 1545 1546 void JvmtiExport::post_exception_throw(JavaThread *thread, Method* method, address location, oop exception) { 1547 HandleMark hm(thread); 1548 methodHandle mh(thread, method); 1549 Handle exception_handle(thread, exception); 1550 1551 JvmtiThreadState *state = thread->jvmti_thread_state(); 1552 if (state == NULL) { 1553 return; 1554 } 1555 1556 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION, ("[%s] Trg Exception thrown triggered", 1557 JvmtiTrace::safe_get_thread_name(thread))); 1558 if (!state->is_exception_detected()) { 1559 state->set_exception_detected(); 1560 JvmtiEnvThreadStateIterator it(state); 1561 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1562 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION) && (exception != NULL)) { 1563 1564 EVT_TRACE(JVMTI_EVENT_EXCEPTION, 1565 ("[%s] Evt Exception thrown sent %s.%s @ " INTX_FORMAT, 1566 JvmtiTrace::safe_get_thread_name(thread), 1567 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1568 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1569 location - mh()->code_base() )); 1570 1571 JvmtiEnv *env = ets->get_env(); 1572 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle); 1573 1574 // It's okay to clear these exceptions here because we duplicate 1575 // this lookup in InterpreterRuntime::exception_handler_for_exception. 1576 EXCEPTION_MARK; 1577 1578 bool should_repeat; 1579 vframeStream st(thread); 1580 assert(!st.at_end(), "cannot be at end"); 1581 Method* current_method = NULL; 1582 // A GC may occur during the Method::fast_exception_handler_bci_for() 1583 // call below if it needs to load the constraint class. Using a 1584 // methodHandle to keep the 'current_method' from being deallocated 1585 // if GC happens. 1586 methodHandle current_mh = methodHandle(thread, current_method); 1587 int current_bci = -1; 1588 do { 1589 current_method = st.method(); 1590 current_mh = methodHandle(thread, current_method); 1591 current_bci = st.bci(); 1592 do { 1593 should_repeat = false; 1594 Klass* eh_klass = exception_handle()->klass(); 1595 current_bci = Method::fast_exception_handler_bci_for( 1596 current_mh, eh_klass, current_bci, THREAD); 1597 if (HAS_PENDING_EXCEPTION) { 1598 exception_handle = Handle(thread, PENDING_EXCEPTION); 1599 CLEAR_PENDING_EXCEPTION; 1600 should_repeat = true; 1601 } 1602 } while (should_repeat && (current_bci != -1)); 1603 st.next(); 1604 } while ((current_bci < 0) && (!st.at_end())); 1605 1606 jmethodID catch_jmethodID; 1607 if (current_bci < 0) { 1608 catch_jmethodID = 0; 1609 current_bci = 0; 1610 } else { 1611 catch_jmethodID = jem.to_jmethodID(current_mh); 1612 } 1613 1614 JvmtiJavaThreadEventTransition jet(thread); 1615 jvmtiEventException callback = env->callbacks()->Exception; 1616 if (callback != NULL) { 1617 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1618 jem.jni_methodID(), jem.location(), 1619 jem.exception(), 1620 catch_jmethodID, current_bci); 1621 } 1622 } 1623 } 1624 } 1625 1626 // frames may get popped because of this throw, be safe - invalidate cached depth 1627 state->invalidate_cur_stack_depth(); 1628 } 1629 1630 1631 void JvmtiExport::notice_unwind_due_to_exception(JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) { 1632 HandleMark hm(thread); 1633 methodHandle mh(thread, method); 1634 Handle exception_handle(thread, exception); 1635 1636 JvmtiThreadState *state = thread->jvmti_thread_state(); 1637 if (state == NULL) { 1638 return; 1639 } 1640 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION_CATCH, 1641 ("[%s] Trg unwind_due_to_exception triggered %s.%s @ %s" INTX_FORMAT " - %s", 1642 JvmtiTrace::safe_get_thread_name(thread), 1643 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1644 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1645 location==0? "no location:" : "", 1646 location==0? 0 : location - mh()->code_base(), 1647 in_handler_frame? "in handler frame" : "not handler frame" )); 1648 1649 if (state->is_exception_detected()) { 1650 1651 state->invalidate_cur_stack_depth(); 1652 if (!in_handler_frame) { 1653 // Not in exception handler. 1654 if(state->is_interp_only_mode()) { 1655 // method exit and frame pop events are posted only in interp mode. 1656 // When these events are enabled code should be in running in interp mode. 1657 JvmtiExport::post_method_exit(thread, method, thread->last_frame()); 1658 // The cached cur_stack_depth might have changed from the 1659 // operations of frame pop or method exit. We are not 100% sure 1660 // the cached cur_stack_depth is still valid depth so invalidate 1661 // it. 1662 state->invalidate_cur_stack_depth(); 1663 } 1664 } else { 1665 // In exception handler frame. Report exception catch. 1666 assert(location != NULL, "must be a known location"); 1667 // Update cur_stack_depth - the frames above the current frame 1668 // have been unwound due to this exception: 1669 assert(!state->is_exception_caught(), "exception must not be caught yet."); 1670 state->set_exception_caught(); 1671 1672 JvmtiEnvThreadStateIterator it(state); 1673 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1674 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION_CATCH) && (exception_handle() != NULL)) { 1675 EVT_TRACE(JVMTI_EVENT_EXCEPTION_CATCH, 1676 ("[%s] Evt ExceptionCatch sent %s.%s @ " INTX_FORMAT, 1677 JvmtiTrace::safe_get_thread_name(thread), 1678 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1679 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1680 location - mh()->code_base() )); 1681 1682 JvmtiEnv *env = ets->get_env(); 1683 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle); 1684 JvmtiJavaThreadEventTransition jet(thread); 1685 jvmtiEventExceptionCatch callback = env->callbacks()->ExceptionCatch; 1686 if (callback != NULL) { 1687 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1688 jem.jni_methodID(), jem.location(), 1689 jem.exception()); 1690 } 1691 } 1692 } 1693 } 1694 } 1695 } 1696 1697 oop JvmtiExport::jni_GetField_probe(JavaThread *thread, jobject jobj, oop obj, 1698 Klass* klass, jfieldID fieldID, bool is_static) { 1699 if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) { 1700 // At least one field access watch is set so we have more work 1701 // to do. This wrapper is used by entry points that allow us 1702 // to create handles in post_field_access_by_jni(). 1703 post_field_access_by_jni(thread, obj, klass, fieldID, is_static); 1704 // event posting can block so refetch oop if we were passed a jobj 1705 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj); 1706 } 1707 return obj; 1708 } 1709 1710 oop JvmtiExport::jni_GetField_probe_nh(JavaThread *thread, jobject jobj, oop obj, 1711 Klass* klass, jfieldID fieldID, bool is_static) { 1712 if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) { 1713 // At least one field access watch is set so we have more work 1714 // to do. This wrapper is used by "quick" entry points that don't 1715 // allow us to create handles in post_field_access_by_jni(). We 1716 // override that with a ResetNoHandleMark. 1717 ResetNoHandleMark rnhm; 1718 post_field_access_by_jni(thread, obj, klass, fieldID, is_static); 1719 // event posting can block so refetch oop if we were passed a jobj 1720 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj); 1721 } 1722 return obj; 1723 } 1724 1725 void JvmtiExport::post_field_access_by_jni(JavaThread *thread, oop obj, 1726 Klass* klass, jfieldID fieldID, bool is_static) { 1727 // We must be called with a Java context in order to provide reasonable 1728 // values for the klazz, method, and location fields. The callers of this 1729 // function don't make the call unless there is a Java context. 1730 assert(thread->has_last_Java_frame(), "must be called with a Java context"); 1731 1732 ResourceMark rm; 1733 fieldDescriptor fd; 1734 // if get_field_descriptor finds fieldID to be invalid, then we just bail 1735 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd); 1736 assert(valid_fieldID == true,"post_field_access_by_jni called with invalid fieldID"); 1737 if (!valid_fieldID) return; 1738 // field accesses are not watched so bail 1739 if (!fd.is_field_access_watched()) return; 1740 1741 HandleMark hm(thread); 1742 Handle h_obj; 1743 if (!is_static) { 1744 // non-static field accessors have an object, but we need a handle 1745 assert(obj != NULL, "non-static needs an object"); 1746 h_obj = Handle(thread, obj); 1747 } 1748 post_field_access(thread, 1749 thread->last_frame().interpreter_frame_method(), 1750 thread->last_frame().interpreter_frame_bcp(), 1751 klass, h_obj, fieldID); 1752 } 1753 1754 void JvmtiExport::post_field_access(JavaThread *thread, Method* method, 1755 address location, Klass* field_klass, Handle object, jfieldID field) { 1756 1757 HandleMark hm(thread); 1758 methodHandle mh(thread, method); 1759 1760 JvmtiThreadState *state = thread->jvmti_thread_state(); 1761 if (state == NULL) { 1762 return; 1763 } 1764 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Trg Field Access event triggered", 1765 JvmtiTrace::safe_get_thread_name(thread))); 1766 JvmtiEnvThreadStateIterator it(state); 1767 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1768 if (ets->is_enabled(JVMTI_EVENT_FIELD_ACCESS)) { 1769 EVT_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Evt Field Access event sent %s.%s @ " INTX_FORMAT, 1770 JvmtiTrace::safe_get_thread_name(thread), 1771 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1772 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1773 location - mh()->code_base() )); 1774 1775 JvmtiEnv *env = ets->get_env(); 1776 JvmtiLocationEventMark jem(thread, mh, location); 1777 jclass field_jclass = jem.to_jclass(field_klass); 1778 jobject field_jobject = jem.to_jobject(object()); 1779 JvmtiJavaThreadEventTransition jet(thread); 1780 jvmtiEventFieldAccess callback = env->callbacks()->FieldAccess; 1781 if (callback != NULL) { 1782 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1783 jem.jni_methodID(), jem.location(), 1784 field_jclass, field_jobject, field); 1785 } 1786 } 1787 } 1788 } 1789 1790 oop JvmtiExport::jni_SetField_probe(JavaThread *thread, jobject jobj, oop obj, 1791 Klass* klass, jfieldID fieldID, bool is_static, 1792 char sig_type, jvalue *value) { 1793 if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) { 1794 // At least one field modification watch is set so we have more work 1795 // to do. This wrapper is used by entry points that allow us 1796 // to create handles in post_field_modification_by_jni(). 1797 post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value); 1798 // event posting can block so refetch oop if we were passed a jobj 1799 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj); 1800 } 1801 return obj; 1802 } 1803 1804 oop JvmtiExport::jni_SetField_probe_nh(JavaThread *thread, jobject jobj, oop obj, 1805 Klass* klass, jfieldID fieldID, bool is_static, 1806 char sig_type, jvalue *value) { 1807 if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) { 1808 // At least one field modification watch is set so we have more work 1809 // to do. This wrapper is used by "quick" entry points that don't 1810 // allow us to create handles in post_field_modification_by_jni(). We 1811 // override that with a ResetNoHandleMark. 1812 ResetNoHandleMark rnhm; 1813 post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value); 1814 // event posting can block so refetch oop if we were passed a jobj 1815 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj); 1816 } 1817 return obj; 1818 } 1819 1820 void JvmtiExport::post_field_modification_by_jni(JavaThread *thread, oop obj, 1821 Klass* klass, jfieldID fieldID, bool is_static, 1822 char sig_type, jvalue *value) { 1823 // We must be called with a Java context in order to provide reasonable 1824 // values for the klazz, method, and location fields. The callers of this 1825 // function don't make the call unless there is a Java context. 1826 assert(thread->has_last_Java_frame(), "must be called with Java context"); 1827 1828 ResourceMark rm; 1829 fieldDescriptor fd; 1830 // if get_field_descriptor finds fieldID to be invalid, then we just bail 1831 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd); 1832 assert(valid_fieldID == true,"post_field_modification_by_jni called with invalid fieldID"); 1833 if (!valid_fieldID) return; 1834 // field modifications are not watched so bail 1835 if (!fd.is_field_modification_watched()) return; 1836 1837 HandleMark hm(thread); 1838 1839 Handle h_obj; 1840 if (!is_static) { 1841 // non-static field accessors have an object, but we need a handle 1842 assert(obj != NULL, "non-static needs an object"); 1843 h_obj = Handle(thread, obj); 1844 } 1845 post_field_modification(thread, 1846 thread->last_frame().interpreter_frame_method(), 1847 thread->last_frame().interpreter_frame_bcp(), 1848 klass, h_obj, fieldID, sig_type, value); 1849 } 1850 1851 void JvmtiExport::post_raw_field_modification(JavaThread *thread, Method* method, 1852 address location, Klass* field_klass, Handle object, jfieldID field, 1853 char sig_type, jvalue *value) { 1854 1855 if (sig_type == 'I' || sig_type == 'Z' || sig_type == 'B' || sig_type == 'C' || sig_type == 'S') { 1856 // 'I' instructions are used for byte, char, short and int. 1857 // determine which it really is, and convert 1858 fieldDescriptor fd; 1859 bool found = JvmtiEnv::get_field_descriptor(field_klass, field, &fd); 1860 // should be found (if not, leave as is) 1861 if (found) { 1862 jint ival = value->i; 1863 // convert value from int to appropriate type 1864 switch (fd.field_type()) { 1865 case T_BOOLEAN: 1866 sig_type = 'Z'; 1867 value->i = 0; // clear it 1868 value->z = (jboolean)ival; 1869 break; 1870 case T_BYTE: 1871 sig_type = 'B'; 1872 value->i = 0; // clear it 1873 value->b = (jbyte)ival; 1874 break; 1875 case T_CHAR: 1876 sig_type = 'C'; 1877 value->i = 0; // clear it 1878 value->c = (jchar)ival; 1879 break; 1880 case T_SHORT: 1881 sig_type = 'S'; 1882 value->i = 0; // clear it 1883 value->s = (jshort)ival; 1884 break; 1885 case T_INT: 1886 // nothing to do 1887 break; 1888 default: 1889 // this is an integer instruction, should be one of above 1890 ShouldNotReachHere(); 1891 break; 1892 } 1893 } 1894 } 1895 1896 assert(sig_type != '[', "array should have sig_type == 'L'"); 1897 bool handle_created = false; 1898 1899 // convert oop to JNI handle. 1900 if (sig_type == 'L') { 1901 handle_created = true; 1902 value->l = (jobject)JNIHandles::make_local(thread, (oop)value->l); 1903 } 1904 1905 post_field_modification(thread, method, location, field_klass, object, field, sig_type, value); 1906 1907 // Destroy the JNI handle allocated above. 1908 if (handle_created) { 1909 JNIHandles::destroy_local(value->l); 1910 } 1911 } 1912 1913 void JvmtiExport::post_field_modification(JavaThread *thread, Method* method, 1914 address location, Klass* field_klass, Handle object, jfieldID field, 1915 char sig_type, jvalue *value_ptr) { 1916 1917 HandleMark hm(thread); 1918 methodHandle mh(thread, method); 1919 1920 JvmtiThreadState *state = thread->jvmti_thread_state(); 1921 if (state == NULL) { 1922 return; 1923 } 1924 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_MODIFICATION, 1925 ("[%s] Trg Field Modification event triggered", 1926 JvmtiTrace::safe_get_thread_name(thread))); 1927 1928 JvmtiEnvThreadStateIterator it(state); 1929 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1930 if (ets->is_enabled(JVMTI_EVENT_FIELD_MODIFICATION)) { 1931 EVT_TRACE(JVMTI_EVENT_FIELD_MODIFICATION, 1932 ("[%s] Evt Field Modification event sent %s.%s @ " INTX_FORMAT, 1933 JvmtiTrace::safe_get_thread_name(thread), 1934 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1935 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1936 location - mh()->code_base() )); 1937 1938 JvmtiEnv *env = ets->get_env(); 1939 JvmtiLocationEventMark jem(thread, mh, location); 1940 jclass field_jclass = jem.to_jclass(field_klass); 1941 jobject field_jobject = jem.to_jobject(object()); 1942 JvmtiJavaThreadEventTransition jet(thread); 1943 jvmtiEventFieldModification callback = env->callbacks()->FieldModification; 1944 if (callback != NULL) { 1945 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1946 jem.jni_methodID(), jem.location(), 1947 field_jclass, field_jobject, field, sig_type, *value_ptr); 1948 } 1949 } 1950 } 1951 } 1952 1953 void JvmtiExport::post_native_method_bind(Method* method, address* function_ptr) { 1954 JavaThread* thread = JavaThread::current(); 1955 assert(thread->thread_state() == _thread_in_vm, "must be in vm state"); 1956 1957 HandleMark hm(thread); 1958 methodHandle mh(thread, method); 1959 1960 EVT_TRIG_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Trg Native Method Bind event triggered", 1961 JvmtiTrace::safe_get_thread_name(thread))); 1962 1963 if (JvmtiEventController::is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) { 1964 JvmtiEnvIterator it; 1965 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1966 if (env->is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) { 1967 EVT_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Evt Native Method Bind event sent", 1968 JvmtiTrace::safe_get_thread_name(thread) )); 1969 1970 JvmtiMethodEventMark jem(thread, mh); 1971 JvmtiJavaThreadEventTransition jet(thread); 1972 JNIEnv* jni_env = (env->phase() == JVMTI_PHASE_PRIMORDIAL) ? NULL : jem.jni_env(); 1973 jvmtiEventNativeMethodBind callback = env->callbacks()->NativeMethodBind; 1974 if (callback != NULL) { 1975 (*callback)(env->jvmti_external(), jni_env, jem.jni_thread(), 1976 jem.jni_methodID(), (void*)(*function_ptr), (void**)function_ptr); 1977 } 1978 } 1979 } 1980 } 1981 } 1982 1983 // Returns a record containing inlining information for the given nmethod 1984 jvmtiCompiledMethodLoadInlineRecord* create_inline_record(nmethod* nm) { 1985 jint numstackframes = 0; 1986 jvmtiCompiledMethodLoadInlineRecord* record = (jvmtiCompiledMethodLoadInlineRecord*)NEW_RESOURCE_OBJ(jvmtiCompiledMethodLoadInlineRecord); 1987 record->header.kind = JVMTI_CMLR_INLINE_INFO; 1988 record->header.next = NULL; 1989 record->header.majorinfoversion = JVMTI_CMLR_MAJOR_VERSION_1; 1990 record->header.minorinfoversion = JVMTI_CMLR_MINOR_VERSION_0; 1991 record->numpcs = 0; 1992 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) { 1993 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue; 1994 record->numpcs++; 1995 } 1996 record->pcinfo = (PCStackInfo*)(NEW_RESOURCE_ARRAY(PCStackInfo, record->numpcs)); 1997 int scope = 0; 1998 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) { 1999 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue; 2000 void* pc_address = (void*)p->real_pc(nm); 2001 assert(pc_address != NULL, "pc_address must be non-null"); 2002 record->pcinfo[scope].pc = pc_address; 2003 numstackframes=0; 2004 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != NULL;sd = sd->sender()) { 2005 numstackframes++; 2006 } 2007 assert(numstackframes != 0, "numstackframes must be nonzero."); 2008 record->pcinfo[scope].methods = (jmethodID *)NEW_RESOURCE_ARRAY(jmethodID, numstackframes); 2009 record->pcinfo[scope].bcis = (jint *)NEW_RESOURCE_ARRAY(jint, numstackframes); 2010 record->pcinfo[scope].numstackframes = numstackframes; 2011 int stackframe = 0; 2012 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != NULL;sd = sd->sender()) { 2013 // 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() 2014 assert(sd->method() != NULL, "sd->method() cannot be null."); 2015 record->pcinfo[scope].methods[stackframe] = sd->method()->jmethod_id(); 2016 record->pcinfo[scope].bcis[stackframe] = sd->bci(); 2017 stackframe++; 2018 } 2019 scope++; 2020 } 2021 return record; 2022 } 2023 2024 void JvmtiExport::post_compiled_method_load(nmethod *nm) { 2025 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 2026 return; 2027 } 2028 JavaThread* thread = JavaThread::current(); 2029 2030 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD, 2031 ("[%s] method compile load event triggered", 2032 JvmtiTrace::safe_get_thread_name(thread))); 2033 2034 JvmtiEnvIterator it; 2035 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2036 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) { 2037 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 2038 continue; 2039 } 2040 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD, 2041 ("[%s] class compile method load event sent %s.%s ", 2042 JvmtiTrace::safe_get_thread_name(thread), 2043 (nm->method() == NULL) ? "NULL" : nm->method()->klass_name()->as_C_string(), 2044 (nm->method() == NULL) ? "NULL" : nm->method()->name()->as_C_string())); 2045 ResourceMark rm(thread); 2046 HandleMark hm(thread); 2047 2048 // Add inlining information 2049 jvmtiCompiledMethodLoadInlineRecord* inlinerecord = create_inline_record(nm); 2050 // Pass inlining information through the void pointer 2051 JvmtiCompiledMethodLoadEventMark jem(thread, nm, inlinerecord); 2052 JvmtiJavaThreadEventTransition jet(thread); 2053 jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad; 2054 if (callback != NULL) { 2055 (*callback)(env->jvmti_external(), jem.jni_methodID(), 2056 jem.code_size(), jem.code_data(), jem.map_length(), 2057 jem.map(), jem.compile_info()); 2058 } 2059 } 2060 } 2061 } 2062 2063 2064 // post a COMPILED_METHOD_LOAD event for a given environment 2065 void JvmtiExport::post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length, 2066 const void *code_begin, const jint map_length, 2067 const jvmtiAddrLocationMap* map) 2068 { 2069 if (env->phase() <= JVMTI_PHASE_PRIMORDIAL) { 2070 return; 2071 } 2072 JavaThread* thread = JavaThread::current(); 2073 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD, 2074 ("[%s] method compile load event triggered (by GenerateEvents)", 2075 JvmtiTrace::safe_get_thread_name(thread))); 2076 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) { 2077 2078 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD, 2079 ("[%s] class compile method load event sent (by GenerateEvents), jmethodID=" PTR_FORMAT, 2080 JvmtiTrace::safe_get_thread_name(thread), p2i(method))); 2081 2082 JvmtiEventMark jem(thread); 2083 JvmtiJavaThreadEventTransition jet(thread); 2084 jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad; 2085 if (callback != NULL) { 2086 (*callback)(env->jvmti_external(), method, 2087 length, code_begin, map_length, 2088 map, NULL); 2089 } 2090 } 2091 } 2092 2093 void JvmtiExport::post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) { 2094 assert(name != NULL && name[0] != '\0', "sanity check"); 2095 2096 JavaThread* thread = JavaThread::current(); 2097 // In theory everyone coming thru here is in_vm but we need to be certain 2098 // because a callee will do a vm->native transition 2099 ThreadInVMfromUnknown __tiv; 2100 2101 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED, 2102 ("[%s] method dynamic code generated event triggered", 2103 JvmtiTrace::safe_get_thread_name(thread))); 2104 JvmtiEnvIterator it; 2105 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2106 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) { 2107 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED, 2108 ("[%s] dynamic code generated event sent for %s", 2109 JvmtiTrace::safe_get_thread_name(thread), name)); 2110 JvmtiEventMark jem(thread); 2111 JvmtiJavaThreadEventTransition jet(thread); 2112 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char)); 2113 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated; 2114 if (callback != NULL) { 2115 (*callback)(env->jvmti_external(), name, (void*)code_begin, length); 2116 } 2117 } 2118 } 2119 } 2120 2121 void JvmtiExport::post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) { 2122 jvmtiPhase phase = JvmtiEnv::get_phase(); 2123 if (phase == JVMTI_PHASE_PRIMORDIAL || phase == JVMTI_PHASE_START) { 2124 post_dynamic_code_generated_internal(name, code_begin, code_end); 2125 } else { 2126 // It may not be safe to post the event from this thread. Defer all 2127 // postings to the service thread so that it can perform them in a safe 2128 // context and in-order. 2129 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 2130 JvmtiDeferredEvent event = JvmtiDeferredEvent::dynamic_code_generated_event( 2131 name, code_begin, code_end); 2132 JvmtiDeferredEventQueue::enqueue(event); 2133 } 2134 } 2135 2136 2137 // post a DYNAMIC_CODE_GENERATED event for a given environment 2138 // used by GenerateEvents 2139 void JvmtiExport::post_dynamic_code_generated(JvmtiEnv* env, const char *name, 2140 const void *code_begin, const void *code_end) 2141 { 2142 JavaThread* thread = JavaThread::current(); 2143 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED, 2144 ("[%s] dynamic code generated event triggered (by GenerateEvents)", 2145 JvmtiTrace::safe_get_thread_name(thread))); 2146 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) { 2147 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED, 2148 ("[%s] dynamic code generated event sent for %s", 2149 JvmtiTrace::safe_get_thread_name(thread), name)); 2150 JvmtiEventMark jem(thread); 2151 JvmtiJavaThreadEventTransition jet(thread); 2152 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char)); 2153 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated; 2154 if (callback != NULL) { 2155 (*callback)(env->jvmti_external(), name, (void*)code_begin, length); 2156 } 2157 } 2158 } 2159 2160 // post a DynamicCodeGenerated event while holding locks in the VM. 2161 void JvmtiExport::post_dynamic_code_generated_while_holding_locks(const char* name, 2162 address code_begin, address code_end) 2163 { 2164 // register the stub with the current dynamic code event collector 2165 JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current()); 2166 // state can only be NULL if the current thread is exiting which 2167 // should not happen since we're trying to post an event 2168 guarantee(state != NULL, "attempt to register stub via an exiting thread"); 2169 JvmtiDynamicCodeEventCollector* collector = state->get_dynamic_code_event_collector(); 2170 guarantee(collector != NULL, "attempt to register stub without event collector"); 2171 collector->register_stub(name, code_begin, code_end); 2172 } 2173 2174 // Collect all the vm internally allocated objects which are visible to java world 2175 void JvmtiExport::record_vm_internal_object_allocation(oop obj) { 2176 Thread* thread = Thread::current_or_null(); 2177 if (thread != NULL && thread->is_Java_thread()) { 2178 // Can not take safepoint here. 2179 NoSafepointVerifier no_sfpt; 2180 // Can not take safepoint here so can not use state_for to get 2181 // jvmti thread state. 2182 JvmtiThreadState *state = ((JavaThread*)thread)->jvmti_thread_state(); 2183 if (state != NULL ) { 2184 // state is non NULL when VMObjectAllocEventCollector is enabled. 2185 JvmtiVMObjectAllocEventCollector *collector; 2186 collector = state->get_vm_object_alloc_event_collector(); 2187 if (collector != NULL && collector->is_enabled()) { 2188 // Don't record classes as these will be notified via the ClassLoad 2189 // event. 2190 if (obj->klass() != SystemDictionary::Class_klass()) { 2191 collector->record_allocation(obj); 2192 } 2193 } 2194 } 2195 } 2196 } 2197 2198 void JvmtiExport::post_garbage_collection_finish() { 2199 Thread *thread = Thread::current(); // this event is posted from VM-Thread. 2200 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH, 2201 ("[%s] garbage collection finish event triggered", 2202 JvmtiTrace::safe_get_thread_name(thread))); 2203 JvmtiEnvIterator it; 2204 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2205 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH)) { 2206 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH, 2207 ("[%s] garbage collection finish event sent", 2208 JvmtiTrace::safe_get_thread_name(thread))); 2209 JvmtiThreadEventTransition jet(thread); 2210 // JNIEnv is NULL here because this event is posted from VM Thread 2211 jvmtiEventGarbageCollectionFinish callback = env->callbacks()->GarbageCollectionFinish; 2212 if (callback != NULL) { 2213 (*callback)(env->jvmti_external()); 2214 } 2215 } 2216 } 2217 } 2218 2219 void JvmtiExport::post_garbage_collection_start() { 2220 Thread* thread = Thread::current(); // this event is posted from vm-thread. 2221 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START, 2222 ("[%s] garbage collection start event triggered", 2223 JvmtiTrace::safe_get_thread_name(thread))); 2224 JvmtiEnvIterator it; 2225 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2226 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_START)) { 2227 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START, 2228 ("[%s] garbage collection start event sent", 2229 JvmtiTrace::safe_get_thread_name(thread))); 2230 JvmtiThreadEventTransition jet(thread); 2231 // JNIEnv is NULL here because this event is posted from VM Thread 2232 jvmtiEventGarbageCollectionStart callback = env->callbacks()->GarbageCollectionStart; 2233 if (callback != NULL) { 2234 (*callback)(env->jvmti_external()); 2235 } 2236 } 2237 } 2238 } 2239 2240 void JvmtiExport::post_data_dump() { 2241 Thread *thread = Thread::current(); 2242 EVT_TRIG_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST, 2243 ("[%s] data dump request event triggered", 2244 JvmtiTrace::safe_get_thread_name(thread))); 2245 JvmtiEnvIterator it; 2246 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2247 if (env->is_enabled(JVMTI_EVENT_DATA_DUMP_REQUEST)) { 2248 EVT_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST, 2249 ("[%s] data dump request event sent", 2250 JvmtiTrace::safe_get_thread_name(thread))); 2251 JvmtiThreadEventTransition jet(thread); 2252 // JNIEnv is NULL here because this event is posted from VM Thread 2253 jvmtiEventDataDumpRequest callback = env->callbacks()->DataDumpRequest; 2254 if (callback != NULL) { 2255 (*callback)(env->jvmti_external()); 2256 } 2257 } 2258 } 2259 } 2260 2261 void JvmtiExport::post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) { 2262 oop object = (oop)obj_mntr->object(); 2263 if (!ServiceUtil::visible_oop(object)) { 2264 // Ignore monitor contended enter for vm internal object. 2265 return; 2266 } 2267 JvmtiThreadState *state = thread->jvmti_thread_state(); 2268 if (state == NULL) { 2269 return; 2270 } 2271 2272 HandleMark hm(thread); 2273 Handle h(thread, object); 2274 2275 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER, 2276 ("[%s] montior contended enter event triggered", 2277 JvmtiTrace::safe_get_thread_name(thread))); 2278 2279 JvmtiEnvThreadStateIterator it(state); 2280 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2281 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTER)) { 2282 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER, 2283 ("[%s] monitor contended enter event sent", 2284 JvmtiTrace::safe_get_thread_name(thread))); 2285 JvmtiMonitorEventMark jem(thread, h()); 2286 JvmtiEnv *env = ets->get_env(); 2287 JvmtiThreadEventTransition jet(thread); 2288 jvmtiEventMonitorContendedEnter callback = env->callbacks()->MonitorContendedEnter; 2289 if (callback != NULL) { 2290 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object()); 2291 } 2292 } 2293 } 2294 } 2295 2296 void JvmtiExport::post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) { 2297 oop object = (oop)obj_mntr->object(); 2298 if (!ServiceUtil::visible_oop(object)) { 2299 // Ignore monitor contended entered for vm internal object. 2300 return; 2301 } 2302 JvmtiThreadState *state = thread->jvmti_thread_state(); 2303 if (state == NULL) { 2304 return; 2305 } 2306 2307 HandleMark hm(thread); 2308 Handle h(thread, object); 2309 2310 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED, 2311 ("[%s] montior contended entered event triggered", 2312 JvmtiTrace::safe_get_thread_name(thread))); 2313 2314 JvmtiEnvThreadStateIterator it(state); 2315 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2316 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED)) { 2317 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED, 2318 ("[%s] monitor contended enter event sent", 2319 JvmtiTrace::safe_get_thread_name(thread))); 2320 JvmtiMonitorEventMark jem(thread, h()); 2321 JvmtiEnv *env = ets->get_env(); 2322 JvmtiThreadEventTransition jet(thread); 2323 jvmtiEventMonitorContendedEntered callback = env->callbacks()->MonitorContendedEntered; 2324 if (callback != NULL) { 2325 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object()); 2326 } 2327 } 2328 } 2329 } 2330 2331 void JvmtiExport::post_monitor_wait(JavaThread *thread, oop object, 2332 jlong timeout) { 2333 JvmtiThreadState *state = thread->jvmti_thread_state(); 2334 if (state == NULL) { 2335 return; 2336 } 2337 2338 HandleMark hm(thread); 2339 Handle h(thread, object); 2340 2341 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAIT, 2342 ("[%s] montior wait event triggered", 2343 JvmtiTrace::safe_get_thread_name(thread))); 2344 2345 JvmtiEnvThreadStateIterator it(state); 2346 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2347 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAIT)) { 2348 EVT_TRACE(JVMTI_EVENT_MONITOR_WAIT, 2349 ("[%s] monitor wait event sent", 2350 JvmtiTrace::safe_get_thread_name(thread))); 2351 JvmtiMonitorEventMark jem(thread, h()); 2352 JvmtiEnv *env = ets->get_env(); 2353 JvmtiThreadEventTransition jet(thread); 2354 jvmtiEventMonitorWait callback = env->callbacks()->MonitorWait; 2355 if (callback != NULL) { 2356 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 2357 jem.jni_object(), timeout); 2358 } 2359 } 2360 } 2361 } 2362 2363 void JvmtiExport::post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) { 2364 oop object = (oop)obj_mntr->object(); 2365 if (!ServiceUtil::visible_oop(object)) { 2366 // Ignore monitor waited for vm internal object. 2367 return; 2368 } 2369 JvmtiThreadState *state = thread->jvmti_thread_state(); 2370 if (state == NULL) { 2371 return; 2372 } 2373 2374 HandleMark hm(thread); 2375 Handle h(thread, object); 2376 2377 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAITED, 2378 ("[%s] montior waited event triggered", 2379 JvmtiTrace::safe_get_thread_name(thread))); 2380 2381 JvmtiEnvThreadStateIterator it(state); 2382 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2383 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAITED)) { 2384 EVT_TRACE(JVMTI_EVENT_MONITOR_WAITED, 2385 ("[%s] monitor waited event sent", 2386 JvmtiTrace::safe_get_thread_name(thread))); 2387 JvmtiMonitorEventMark jem(thread, h()); 2388 JvmtiEnv *env = ets->get_env(); 2389 JvmtiThreadEventTransition jet(thread); 2390 jvmtiEventMonitorWaited callback = env->callbacks()->MonitorWaited; 2391 if (callback != NULL) { 2392 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 2393 jem.jni_object(), timed_out); 2394 } 2395 } 2396 } 2397 } 2398 2399 2400 void JvmtiExport::post_vm_object_alloc(JavaThread *thread, oop object) { 2401 EVT_TRIG_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Trg vm object alloc triggered", 2402 JvmtiTrace::safe_get_thread_name(thread))); 2403 if (object == NULL) { 2404 return; 2405 } 2406 HandleMark hm(thread); 2407 Handle h(thread, object); 2408 JvmtiEnvIterator it; 2409 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2410 if (env->is_enabled(JVMTI_EVENT_VM_OBJECT_ALLOC)) { 2411 EVT_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Evt vmobject alloc sent %s", 2412 JvmtiTrace::safe_get_thread_name(thread), 2413 object==NULL? "NULL" : object->klass()->external_name())); 2414 2415 JvmtiVMObjectAllocEventMark jem(thread, h()); 2416 JvmtiJavaThreadEventTransition jet(thread); 2417 jvmtiEventVMObjectAlloc callback = env->callbacks()->VMObjectAlloc; 2418 if (callback != NULL) { 2419 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 2420 jem.jni_jobject(), jem.jni_class(), jem.size()); 2421 } 2422 } 2423 } 2424 } 2425 2426 //////////////////////////////////////////////////////////////////////////////////////////////// 2427 2428 void JvmtiExport::cleanup_thread(JavaThread* thread) { 2429 assert(JavaThread::current() == thread, "thread is not current"); 2430 MutexLocker mu(JvmtiThreadState_lock); 2431 2432 if (thread->jvmti_thread_state() != NULL) { 2433 // This has to happen after the thread state is removed, which is 2434 // why it is not in post_thread_end_event like its complement 2435 // Maybe both these functions should be rolled into the posts? 2436 JvmtiEventController::thread_ended(thread); 2437 } 2438 } 2439 2440 void JvmtiExport::clear_detected_exception(JavaThread* thread) { 2441 assert(JavaThread::current() == thread, "thread is not current"); 2442 2443 JvmtiThreadState* state = thread->jvmti_thread_state(); 2444 if (state != NULL) { 2445 state->clear_exception_state(); 2446 } 2447 } 2448 2449 void JvmtiExport::oops_do(OopClosure* f) { 2450 JvmtiCurrentBreakpoints::oops_do(f); 2451 JvmtiVMObjectAllocEventCollector::oops_do_for_all_threads(f); 2452 } 2453 2454 void JvmtiExport::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f) { 2455 JvmtiTagMap::weak_oops_do(is_alive, f); 2456 } 2457 2458 void JvmtiExport::gc_epilogue() { 2459 JvmtiCurrentBreakpoints::gc_epilogue(); 2460 } 2461 2462 // Onload raw monitor transition. 2463 void JvmtiExport::transition_pending_onload_raw_monitors() { 2464 JvmtiPendingMonitors::transition_raw_monitors(); 2465 } 2466 2467 //////////////////////////////////////////////////////////////////////////////////////////////// 2468 #if INCLUDE_SERVICES 2469 // Attach is disabled if SERVICES is not included 2470 2471 // type for the Agent_OnAttach entry point 2472 extern "C" { 2473 typedef jint (JNICALL *OnAttachEntry_t)(JavaVM*, char *, void *); 2474 } 2475 2476 jint JvmtiExport::load_agent_library(const char *agent, const char *absParam, 2477 const char *options, outputStream* st) { 2478 char ebuf[1024]; 2479 char buffer[JVM_MAXPATHLEN]; 2480 void* library = NULL; 2481 jint result = JNI_ERR; 2482 const char *on_attach_symbols[] = AGENT_ONATTACH_SYMBOLS; 2483 size_t num_symbol_entries = ARRAY_SIZE(on_attach_symbols); 2484 2485 // The abs paramter should be "true" or "false" 2486 bool is_absolute_path = (absParam != NULL) && (strcmp(absParam,"true")==0); 2487 2488 // Initially marked as invalid. It will be set to valid if we can find the agent 2489 AgentLibrary *agent_lib = new AgentLibrary(agent, options, is_absolute_path, NULL); 2490 2491 // Check for statically linked in agent. If not found then if the path is 2492 // absolute we attempt to load the library. Otherwise we try to load it 2493 // from the standard dll directory. 2494 2495 if (!os::find_builtin_agent(agent_lib, on_attach_symbols, num_symbol_entries)) { 2496 if (is_absolute_path) { 2497 library = os::dll_load(agent, ebuf, sizeof ebuf); 2498 } else { 2499 // Try to load the agent from the standard dll directory 2500 if (os::dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(), 2501 agent)) { 2502 library = os::dll_load(buffer, ebuf, sizeof ebuf); 2503 } 2504 if (library == NULL) { 2505 // not found - try OS default library path 2506 if (os::dll_build_name(buffer, sizeof(buffer), agent)) { 2507 library = os::dll_load(buffer, ebuf, sizeof ebuf); 2508 } 2509 } 2510 } 2511 if (library != NULL) { 2512 agent_lib->set_os_lib(library); 2513 agent_lib->set_valid(); 2514 } 2515 } 2516 // If the library was loaded then we attempt to invoke the Agent_OnAttach 2517 // function 2518 if (agent_lib->valid()) { 2519 // Lookup the Agent_OnAttach function 2520 OnAttachEntry_t on_attach_entry = NULL; 2521 on_attach_entry = CAST_TO_FN_PTR(OnAttachEntry_t, 2522 os::find_agent_function(agent_lib, false, on_attach_symbols, num_symbol_entries)); 2523 if (on_attach_entry == NULL) { 2524 // Agent_OnAttach missing - unload library 2525 if (!agent_lib->is_static_lib()) { 2526 os::dll_unload(library); 2527 } 2528 delete agent_lib; 2529 } else { 2530 // Invoke the Agent_OnAttach function 2531 JavaThread* THREAD = JavaThread::current(); 2532 { 2533 extern struct JavaVM_ main_vm; 2534 JvmtiThreadEventMark jem(THREAD); 2535 JvmtiJavaThreadEventTransition jet(THREAD); 2536 2537 result = (*on_attach_entry)(&main_vm, (char*)options, NULL); 2538 } 2539 2540 // Agent_OnAttach may have used JNI 2541 if (HAS_PENDING_EXCEPTION) { 2542 CLEAR_PENDING_EXCEPTION; 2543 } 2544 2545 // If OnAttach returns JNI_OK then we add it to the list of 2546 // agent libraries so that we can call Agent_OnUnload later. 2547 if (result == JNI_OK) { 2548 Arguments::add_loaded_agent(agent_lib); 2549 } else { 2550 delete agent_lib; 2551 } 2552 2553 // Agent_OnAttach executed so completion status is JNI_OK 2554 st->print_cr("%d", result); 2555 result = JNI_OK; 2556 } 2557 } 2558 return result; 2559 } 2560 2561 #endif // INCLUDE_SERVICES 2562 //////////////////////////////////////////////////////////////////////////////////////////////// 2563 2564 // Setup current current thread for event collection. 2565 void JvmtiEventCollector::setup_jvmti_thread_state() { 2566 // set this event collector to be the current one. 2567 JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current()); 2568 // state can only be NULL if the current thread is exiting which 2569 // should not happen since we're trying to configure for event collection 2570 guarantee(state != NULL, "exiting thread called setup_jvmti_thread_state"); 2571 if (is_vm_object_alloc_event()) { 2572 _prev = state->get_vm_object_alloc_event_collector(); 2573 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)this); 2574 } else if (is_dynamic_code_event()) { 2575 _prev = state->get_dynamic_code_event_collector(); 2576 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)this); 2577 } 2578 } 2579 2580 // Unset current event collection in this thread and reset it with previous 2581 // collector. 2582 void JvmtiEventCollector::unset_jvmti_thread_state() { 2583 JvmtiThreadState* state = JavaThread::current()->jvmti_thread_state(); 2584 if (state != NULL) { 2585 // restore the previous event collector (if any) 2586 if (is_vm_object_alloc_event()) { 2587 if (state->get_vm_object_alloc_event_collector() == this) { 2588 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)_prev); 2589 } else { 2590 // this thread's jvmti state was created during the scope of 2591 // the event collector. 2592 } 2593 } else { 2594 if (is_dynamic_code_event()) { 2595 if (state->get_dynamic_code_event_collector() == this) { 2596 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)_prev); 2597 } else { 2598 // this thread's jvmti state was created during the scope of 2599 // the event collector. 2600 } 2601 } 2602 } 2603 } 2604 } 2605 2606 // create the dynamic code event collector 2607 JvmtiDynamicCodeEventCollector::JvmtiDynamicCodeEventCollector() : _code_blobs(NULL) { 2608 if (JvmtiExport::should_post_dynamic_code_generated()) { 2609 setup_jvmti_thread_state(); 2610 } 2611 } 2612 2613 // iterate over any code blob descriptors collected and post a 2614 // DYNAMIC_CODE_GENERATED event to the profiler. 2615 JvmtiDynamicCodeEventCollector::~JvmtiDynamicCodeEventCollector() { 2616 assert(!JavaThread::current()->owns_locks(), "all locks must be released to post deferred events"); 2617 // iterate over any code blob descriptors that we collected 2618 if (_code_blobs != NULL) { 2619 for (int i=0; i<_code_blobs->length(); i++) { 2620 JvmtiCodeBlobDesc* blob = _code_blobs->at(i); 2621 JvmtiExport::post_dynamic_code_generated(blob->name(), blob->code_begin(), blob->code_end()); 2622 FreeHeap(blob); 2623 } 2624 delete _code_blobs; 2625 } 2626 unset_jvmti_thread_state(); 2627 } 2628 2629 // register a stub 2630 void JvmtiDynamicCodeEventCollector::register_stub(const char* name, address start, address end) { 2631 if (_code_blobs == NULL) { 2632 _code_blobs = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JvmtiCodeBlobDesc*>(1,true); 2633 } 2634 _code_blobs->append(new JvmtiCodeBlobDesc(name, start, end)); 2635 } 2636 2637 // Setup current thread to record vm allocated objects. 2638 JvmtiVMObjectAllocEventCollector::JvmtiVMObjectAllocEventCollector() : _allocated(NULL) { 2639 if (JvmtiExport::should_post_vm_object_alloc()) { 2640 _enable = true; 2641 setup_jvmti_thread_state(); 2642 } else { 2643 _enable = false; 2644 } 2645 } 2646 2647 // Post vm_object_alloc event for vm allocated objects visible to java 2648 // world. 2649 JvmtiVMObjectAllocEventCollector::~JvmtiVMObjectAllocEventCollector() { 2650 if (_allocated != NULL) { 2651 set_enabled(false); 2652 for (int i = 0; i < _allocated->length(); i++) { 2653 oop obj = _allocated->at(i); 2654 if (ServiceUtil::visible_oop(obj)) { 2655 JvmtiExport::post_vm_object_alloc(JavaThread::current(), obj); 2656 } 2657 } 2658 delete _allocated; 2659 } 2660 unset_jvmti_thread_state(); 2661 } 2662 2663 void JvmtiVMObjectAllocEventCollector::record_allocation(oop obj) { 2664 assert(is_enabled(), "VM object alloc event collector is not enabled"); 2665 if (_allocated == NULL) { 2666 _allocated = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(1, true); 2667 } 2668 _allocated->push(obj); 2669 } 2670 2671 // GC support. 2672 void JvmtiVMObjectAllocEventCollector::oops_do(OopClosure* f) { 2673 if (_allocated != NULL) { 2674 for(int i=_allocated->length() - 1; i >= 0; i--) { 2675 if (_allocated->at(i) != NULL) { 2676 f->do_oop(_allocated->adr_at(i)); 2677 } 2678 } 2679 } 2680 } 2681 2682 void JvmtiVMObjectAllocEventCollector::oops_do_for_all_threads(OopClosure* f) { 2683 // no-op if jvmti not enabled 2684 if (!JvmtiEnv::environments_might_exist()) { 2685 return; 2686 } 2687 2688 // Runs at safepoint. So no need to acquire Threads_lock. 2689 for (JavaThread *jthr = Threads::first(); jthr != NULL; jthr = jthr->next()) { 2690 JvmtiThreadState *state = jthr->jvmti_thread_state(); 2691 if (state != NULL) { 2692 JvmtiVMObjectAllocEventCollector *collector; 2693 collector = state->get_vm_object_alloc_event_collector(); 2694 while (collector != NULL) { 2695 collector->oops_do(f); 2696 collector = (JvmtiVMObjectAllocEventCollector *)collector->get_prev(); 2697 } 2698 } 2699 } 2700 } 2701 2702 2703 // Disable collection of VMObjectAlloc events 2704 NoJvmtiVMObjectAllocMark::NoJvmtiVMObjectAllocMark() : _collector(NULL) { 2705 // a no-op if VMObjectAlloc event is not enabled 2706 if (!JvmtiExport::should_post_vm_object_alloc()) { 2707 return; 2708 } 2709 Thread* thread = Thread::current_or_null(); 2710 if (thread != NULL && thread->is_Java_thread()) { 2711 JavaThread* current_thread = (JavaThread*)thread; 2712 JvmtiThreadState *state = current_thread->jvmti_thread_state(); 2713 if (state != NULL) { 2714 JvmtiVMObjectAllocEventCollector *collector; 2715 collector = state->get_vm_object_alloc_event_collector(); 2716 if (collector != NULL && collector->is_enabled()) { 2717 _collector = collector; 2718 _collector->set_enabled(false); 2719 } 2720 } 2721 } 2722 } 2723 2724 // Re-Enable collection of VMObjectAlloc events (if previously enabled) 2725 NoJvmtiVMObjectAllocMark::~NoJvmtiVMObjectAllocMark() { 2726 if (was_enabled()) { 2727 _collector->set_enabled(true); 2728 } 2729 }; 2730 2731 JvmtiGCMarker::JvmtiGCMarker() { 2732 // if there aren't any JVMTI environments then nothing to do 2733 if (!JvmtiEnv::environments_might_exist()) { 2734 return; 2735 } 2736 2737 if (JvmtiExport::should_post_garbage_collection_start()) { 2738 JvmtiExport::post_garbage_collection_start(); 2739 } 2740 2741 if (SafepointSynchronize::is_at_safepoint()) { 2742 // Do clean up tasks that need to be done at a safepoint 2743 JvmtiEnvBase::check_for_periodic_clean_up(); 2744 } 2745 } 2746 2747 JvmtiGCMarker::~JvmtiGCMarker() { 2748 // if there aren't any JVMTI environments then nothing to do 2749 if (!JvmtiEnv::environments_might_exist()) { 2750 return; 2751 } 2752 2753 // JVMTI notify gc finish 2754 if (JvmtiExport::should_post_garbage_collection_finish()) { 2755 JvmtiExport::post_garbage_collection_finish(); 2756 } 2757 }