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