jvmtiExport.cpp revision 12290:8953c0318163
1/* 2 * Copyright (c) 2003, 2016, 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. 80class JvmtiJavaThreadEventTransition : StackObj { 81private: 82 ResourceMark _rm; 83 ThreadToNativeFromVM _transition; 84 HandleMark _hm; 85 86public: 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. 95class JvmtiThreadEventTransition : StackObj { 96private: 97 ResourceMark _rm; 98 HandleMark _hm; 99 JavaThreadState _saved_state; 100 JavaThread *_jthread; 101 102public: 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 129class JvmtiEventMark : public StackObj { 130private: 131 JavaThread *_thread; 132 JNIEnv* _jni_env; 133 bool _exception_detected; 134 bool _exception_caught; 135#if 0 136 JNIHandleBlock* _hblock; 137#endif 138 139public: 140 JvmtiEventMark(JavaThread *thread) : _thread(thread), 141 _jni_env(thread->jni_environment()) { 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 _exception_detected = state->is_exception_detected(); 153 _exception_caught = state->is_exception_caught(); 154 } else { 155 _exception_detected = false; 156 _exception_caught = false; 157 } 158 159 JNIHandleBlock* old_handles = thread->active_handles(); 160 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread); 161 assert(new_handles != NULL, "should not be NULL"); 162 new_handles->set_pop_frame_link(old_handles); 163 thread->set_active_handles(new_handles); 164#endif 165 assert(thread == JavaThread::current(), "thread must be current!"); 166 thread->frame_anchor()->make_walkable(thread); 167 }; 168 169 ~JvmtiEventMark() { 170#if 0 171 _hblock->clear(); // for consistency with future correct behavior 172#else 173 // we want to use the code above - but that needs the JNIHandle changes - later... 174 // for now, steal JNI pop local frame code 175 JNIHandleBlock* old_handles = _thread->active_handles(); 176 JNIHandleBlock* new_handles = old_handles->pop_frame_link(); 177 assert(new_handles != NULL, "should not be NULL"); 178 _thread->set_active_handles(new_handles); 179 // Note that we set the pop_frame_link to NULL explicitly, otherwise 180 // the release_block call will release the blocks. 181 old_handles->set_pop_frame_link(NULL); 182 JNIHandleBlock::release_block(old_handles, _thread); // may block 183#endif 184 185 JvmtiThreadState* state = _thread->jvmti_thread_state(); 186 // we are continuing after an event. 187 if (state != NULL) { 188 // Restore the jvmti thread exception state. 189 if (_exception_detected) { 190 state->set_exception_detected(); 191 } 192 if (_exception_caught) { 193 state->set_exception_caught(); 194 } 195 } 196 } 197 198#if 0 199 jobject to_jobject(oop obj) { return obj == NULL? NULL : _hblock->allocate_handle_fast(obj); } 200#else 201 // we want to use the code above - but that needs the JNIHandle changes - later... 202 // for now, use regular make_local 203 jobject to_jobject(oop obj) { return JNIHandles::make_local(_thread,obj); } 204#endif 205 206 jclass to_jclass(Klass* klass) { return (klass == NULL ? NULL : (jclass)to_jobject(klass->java_mirror())); } 207 208 jmethodID to_jmethodID(methodHandle method) { return method->jmethod_id(); } 209 210 JNIEnv* jni_env() { return _jni_env; } 211}; 212 213class JvmtiThreadEventMark : public JvmtiEventMark { 214private: 215 jthread _jt; 216 217public: 218 JvmtiThreadEventMark(JavaThread *thread) : 219 JvmtiEventMark(thread) { 220 _jt = (jthread)(to_jobject(thread->threadObj())); 221 }; 222 jthread jni_thread() { return _jt; } 223}; 224 225class JvmtiClassEventMark : public JvmtiThreadEventMark { 226private: 227 jclass _jc; 228 229public: 230 JvmtiClassEventMark(JavaThread *thread, Klass* klass) : 231 JvmtiThreadEventMark(thread) { 232 _jc = to_jclass(klass); 233 }; 234 jclass jni_class() { return _jc; } 235}; 236 237class JvmtiMethodEventMark : public JvmtiThreadEventMark { 238private: 239 jmethodID _mid; 240 241public: 242 JvmtiMethodEventMark(JavaThread *thread, methodHandle method) : 243 JvmtiThreadEventMark(thread), 244 _mid(to_jmethodID(method)) {}; 245 jmethodID jni_methodID() { return _mid; } 246}; 247 248class JvmtiLocationEventMark : public JvmtiMethodEventMark { 249private: 250 jlocation _loc; 251 252public: 253 JvmtiLocationEventMark(JavaThread *thread, methodHandle method, address location) : 254 JvmtiMethodEventMark(thread, method), 255 _loc(location - method->code_base()) {}; 256 jlocation location() { return _loc; } 257}; 258 259class JvmtiExceptionEventMark : public JvmtiLocationEventMark { 260private: 261 jobject _exc; 262 263public: 264 JvmtiExceptionEventMark(JavaThread *thread, methodHandle method, address location, Handle exception) : 265 JvmtiLocationEventMark(thread, method, location), 266 _exc(to_jobject(exception())) {}; 267 jobject exception() { return _exc; } 268}; 269 270class JvmtiClassFileLoadEventMark : public JvmtiThreadEventMark { 271private: 272 const char *_class_name; 273 jobject _jloader; 274 jobject _protection_domain; 275 jclass _class_being_redefined; 276 277public: 278 JvmtiClassFileLoadEventMark(JavaThread *thread, Symbol* name, 279 Handle class_loader, Handle prot_domain, KlassHandle *class_being_redefined) : JvmtiThreadEventMark(thread) { 280 _class_name = name != NULL? name->as_utf8() : NULL; 281 _jloader = (jobject)to_jobject(class_loader()); 282 _protection_domain = (jobject)to_jobject(prot_domain()); 283 if (class_being_redefined == NULL) { 284 _class_being_redefined = NULL; 285 } else { 286 _class_being_redefined = (jclass)to_jclass((*class_being_redefined)()); 287 } 288 }; 289 const char *class_name() { 290 return _class_name; 291 } 292 jobject jloader() { 293 return _jloader; 294 } 295 jobject protection_domain() { 296 return _protection_domain; 297 } 298 jclass class_being_redefined() { 299 return _class_being_redefined; 300 } 301}; 302 303////////////////////////////////////////////////////////////////////////////// 304 305int JvmtiExport::_field_access_count = 0; 306int JvmtiExport::_field_modification_count = 0; 307 308bool JvmtiExport::_can_access_local_variables = false; 309bool JvmtiExport::_can_hotswap_or_post_breakpoint = false; 310bool JvmtiExport::_can_modify_any_class = false; 311bool JvmtiExport::_can_walk_any_space = false; 312 313bool JvmtiExport::_has_redefined_a_class = false; 314bool JvmtiExport::_all_dependencies_are_recorded = false; 315 316// 317// field access management 318// 319 320// interpreter generator needs the address of the counter 321address JvmtiExport::get_field_access_count_addr() { 322 // We don't grab a lock because we don't want to 323 // serialize field access between all threads. This means that a 324 // thread on another processor can see the wrong count value and 325 // may either miss making a needed call into post_field_access() 326 // or will make an unneeded call into post_field_access(). We pay 327 // this price to avoid slowing down the VM when we aren't watching 328 // field accesses. 329 // Other access/mutation safe by virtue of being in VM state. 330 return (address)(&_field_access_count); 331} 332 333// 334// field modification management 335// 336 337// interpreter generator needs the address of the counter 338address JvmtiExport::get_field_modification_count_addr() { 339 // We don't grab a lock because we don't 340 // want to serialize field modification between all threads. This 341 // means that a thread on another processor can see the wrong 342 // count value and may either miss making a needed call into 343 // post_field_modification() or will make an unneeded call into 344 // post_field_modification(). We pay this price to avoid slowing 345 // down the VM when we aren't watching field modifications. 346 // Other access/mutation safe by virtue of being in VM state. 347 return (address)(&_field_modification_count); 348} 349 350 351/////////////////////////////////////////////////////////////// 352// Functions needed by java.lang.instrument for starting up javaagent. 353/////////////////////////////////////////////////////////////// 354 355jint 356JvmtiExport::get_jvmti_interface(JavaVM *jvm, void **penv, jint version) { 357 // The JVMTI_VERSION_INTERFACE_JVMTI part of the version number 358 // has already been validated in JNI GetEnv(). 359 int major, minor, micro; 360 361 // micro version doesn't matter here (yet?) 362 decode_version_values(version, &major, &minor, µ); 363 switch (major) { 364 case 1: 365 switch (minor) { 366 case 0: // version 1.0.<micro> is recognized 367 case 1: // version 1.1.<micro> is recognized 368 case 2: // version 1.2.<micro> is recognized 369 break; 370 371 default: 372 return JNI_EVERSION; // unsupported minor version number 373 } 374 break; 375 case 9: 376 switch (minor) { 377 case 0: // version 9.0.<micro> is recognized 378 break; 379 default: 380 return JNI_EVERSION; // unsupported minor version number 381 } 382 break; 383 default: 384 return JNI_EVERSION; // unsupported major version number 385 } 386 387 if (JvmtiEnv::get_phase() == JVMTI_PHASE_LIVE) { 388 JavaThread* current_thread = JavaThread::current(); 389 // transition code: native to VM 390 ThreadInVMfromNative __tiv(current_thread); 391 VM_ENTRY_BASE(jvmtiEnv*, JvmtiExport::get_jvmti_interface, current_thread) 392 debug_only(VMNativeEntryWrapper __vew;) 393 394 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version); 395 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv* 396 return JNI_OK; 397 398 } else if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) { 399 // not live, no thread to transition 400 JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version); 401 *penv = jvmti_env->jvmti_external(); // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv* 402 return JNI_OK; 403 404 } else { 405 // Called at the wrong time 406 *penv = NULL; 407 return JNI_EDETACHED; 408 } 409} 410 411void 412JvmtiExport::add_default_read_edges(Handle h_module, TRAPS) { 413 if (!Universe::is_module_initialized()) { 414 return; // extra safety 415 } 416 assert(!h_module.is_null(), "module should always be set"); 417 418 // Invoke the transformedByAgent method 419 JavaValue result(T_VOID); 420 JavaCalls::call_static(&result, 421 SystemDictionary::module_Modules_klass(), 422 vmSymbols::transformedByAgent_name(), 423 vmSymbols::transformedByAgent_signature(), 424 h_module, 425 THREAD); 426 427 if (HAS_PENDING_EXCEPTION) { 428 LogTarget(Trace, jvmti) log; 429 LogStreamCHeap log_stream(log); 430 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 431 log_stream.cr(); 432 CLEAR_PENDING_EXCEPTION; 433 return; 434 } 435} 436 437jvmtiError 438JvmtiExport::add_module_reads(Handle module, Handle to_module, TRAPS) { 439 if (!Universe::is_module_initialized()) { 440 return JVMTI_ERROR_NONE; // extra safety 441 } 442 assert(!module.is_null(), "module should always be set"); 443 assert(!to_module.is_null(), "to_module should always be set"); 444 445 // Invoke the addReads method 446 JavaValue result(T_VOID); 447 JavaCalls::call_static(&result, 448 SystemDictionary::module_Modules_klass(), 449 vmSymbols::addReads_name(), 450 vmSymbols::addReads_signature(), 451 module, 452 to_module, 453 THREAD); 454 455 if (HAS_PENDING_EXCEPTION) { 456 LogTarget(Trace, jvmti) log; 457 LogStreamCHeap log_stream(log); 458 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 459 log_stream.cr(); 460 CLEAR_PENDING_EXCEPTION; 461 return JVMTI_ERROR_INTERNAL; 462 } 463 return JVMTI_ERROR_NONE; 464} 465 466jvmtiError 467JvmtiExport::add_module_exports(Handle module, Handle pkg_name, Handle to_module, TRAPS) { 468 if (!Universe::is_module_initialized()) { 469 return JVMTI_ERROR_NONE; // extra safety 470 } 471 assert(!module.is_null(), "module should always be set"); 472 assert(!to_module.is_null(), "to_module should always be set"); 473 assert(!pkg_name.is_null(), "pkg_name should always be set"); 474 475 // Invoke the addExports method 476 JavaValue result(T_VOID); 477 JavaCalls::call_static(&result, 478 SystemDictionary::module_Modules_klass(), 479 vmSymbols::addExports_name(), 480 vmSymbols::addExports_signature(), 481 module, 482 pkg_name, 483 to_module, 484 THREAD); 485 486 if (HAS_PENDING_EXCEPTION) { 487 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); 488 LogTarget(Trace, jvmti) log; 489 LogStreamCHeap log_stream(log); 490 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 491 log_stream.cr(); 492 CLEAR_PENDING_EXCEPTION; 493 if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) { 494 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 495 } 496 return JVMTI_ERROR_INTERNAL; 497 } 498 return JVMTI_ERROR_NONE; 499} 500 501jvmtiError 502JvmtiExport::add_module_opens(Handle module, Handle pkg_name, Handle to_module, TRAPS) { 503 if (!Universe::is_module_initialized()) { 504 return JVMTI_ERROR_NONE; // extra safety 505 } 506 assert(!module.is_null(), "module should always be set"); 507 assert(!to_module.is_null(), "to_module should always be set"); 508 assert(!pkg_name.is_null(), "pkg_name should always be set"); 509 510 // Invoke the addOpens method 511 JavaValue result(T_VOID); 512 JavaCalls::call_static(&result, 513 SystemDictionary::module_Modules_klass(), 514 vmSymbols::addOpens_name(), 515 vmSymbols::addExports_signature(), 516 module, 517 pkg_name, 518 to_module, 519 THREAD); 520 521 if (HAS_PENDING_EXCEPTION) { 522 Symbol* ex_name = PENDING_EXCEPTION->klass()->name(); 523 LogTarget(Trace, jvmti) log; 524 LogStreamCHeap log_stream(log); 525 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 526 log_stream.cr(); 527 CLEAR_PENDING_EXCEPTION; 528 if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) { 529 return JVMTI_ERROR_ILLEGAL_ARGUMENT; 530 } 531 return JVMTI_ERROR_INTERNAL; 532 } 533 return JVMTI_ERROR_NONE; 534} 535 536jvmtiError 537JvmtiExport::add_module_uses(Handle module, Handle service, TRAPS) { 538 if (!Universe::is_module_initialized()) { 539 return JVMTI_ERROR_NONE; // extra safety 540 } 541 assert(!module.is_null(), "module should always be set"); 542 assert(!service.is_null(), "service should always be set"); 543 544 // Invoke the addUses method 545 JavaValue result(T_VOID); 546 JavaCalls::call_static(&result, 547 SystemDictionary::module_Modules_klass(), 548 vmSymbols::addUses_name(), 549 vmSymbols::addUses_signature(), 550 module, 551 service, 552 THREAD); 553 554 if (HAS_PENDING_EXCEPTION) { 555 LogTarget(Trace, jvmti) log; 556 LogStreamCHeap log_stream(log); 557 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 558 log_stream.cr(); 559 CLEAR_PENDING_EXCEPTION; 560 return JVMTI_ERROR_INTERNAL; 561 } 562 return JVMTI_ERROR_NONE; 563} 564 565jvmtiError 566JvmtiExport::add_module_provides(Handle module, Handle service, Handle impl_class, TRAPS) { 567 if (!Universe::is_module_initialized()) { 568 return JVMTI_ERROR_NONE; // extra safety 569 } 570 assert(!module.is_null(), "module should always be set"); 571 assert(!service.is_null(), "service should always be set"); 572 assert(!impl_class.is_null(), "impl_class should always be set"); 573 574 // Invoke the addProvides method 575 JavaValue result(T_VOID); 576 JavaCalls::call_static(&result, 577 SystemDictionary::module_Modules_klass(), 578 vmSymbols::addProvides_name(), 579 vmSymbols::addProvides_signature(), 580 module, 581 service, 582 impl_class, 583 THREAD); 584 585 if (HAS_PENDING_EXCEPTION) { 586 LogTarget(Trace, jvmti) log; 587 LogStreamCHeap log_stream(log); 588 java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream); 589 log_stream.cr(); 590 CLEAR_PENDING_EXCEPTION; 591 return JVMTI_ERROR_INTERNAL; 592 } 593 return JVMTI_ERROR_NONE; 594} 595 596void 597JvmtiExport::decode_version_values(jint version, int * major, int * minor, 598 int * micro) { 599 *major = (version & JVMTI_VERSION_MASK_MAJOR) >> JVMTI_VERSION_SHIFT_MAJOR; 600 *minor = (version & JVMTI_VERSION_MASK_MINOR) >> JVMTI_VERSION_SHIFT_MINOR; 601 *micro = (version & JVMTI_VERSION_MASK_MICRO) >> JVMTI_VERSION_SHIFT_MICRO; 602} 603 604void JvmtiExport::enter_primordial_phase() { 605 JvmtiEnvBase::set_phase(JVMTI_PHASE_PRIMORDIAL); 606} 607 608void JvmtiExport::enter_early_start_phase() { 609 JvmtiManageCapabilities::recompute_always_capabilities(); 610 set_early_vmstart_recorded(true); 611} 612 613void JvmtiExport::enter_start_phase() { 614 JvmtiManageCapabilities::recompute_always_capabilities(); 615 JvmtiEnvBase::set_phase(JVMTI_PHASE_START); 616} 617 618void JvmtiExport::enter_onload_phase() { 619 JvmtiEnvBase::set_phase(JVMTI_PHASE_ONLOAD); 620} 621 622void JvmtiExport::enter_live_phase() { 623 JvmtiEnvBase::set_phase(JVMTI_PHASE_LIVE); 624} 625 626// 627// JVMTI events that the VM posts to the debugger and also startup agent 628// and call the agent's premain() for java.lang.instrument. 629// 630 631void JvmtiExport::post_early_vm_start() { 632 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg Early VM start event triggered" )); 633 634 // can now enable some events 635 JvmtiEventController::vm_start(); 636 637 JvmtiEnvIterator it; 638 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 639 // Only early vmstart envs post early VMStart event 640 if (env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) { 641 EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt Early VM start event sent" )); 642 JavaThread *thread = JavaThread::current(); 643 JvmtiThreadEventMark jem(thread); 644 JvmtiJavaThreadEventTransition jet(thread); 645 jvmtiEventVMStart callback = env->callbacks()->VMStart; 646 if (callback != NULL) { 647 (*callback)(env->jvmti_external(), jem.jni_env()); 648 } 649 } 650 } 651} 652 653void JvmtiExport::post_vm_start() { 654 EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg VM start event triggered" )); 655 656 // can now enable some events 657 JvmtiEventController::vm_start(); 658 659 JvmtiEnvIterator it; 660 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 661 // Early vmstart envs do not post normal VMStart event 662 if (!env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) { 663 EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt VM start event sent" )); 664 665 JavaThread *thread = JavaThread::current(); 666 JvmtiThreadEventMark jem(thread); 667 JvmtiJavaThreadEventTransition jet(thread); 668 jvmtiEventVMStart callback = env->callbacks()->VMStart; 669 if (callback != NULL) { 670 (*callback)(env->jvmti_external(), jem.jni_env()); 671 } 672 } 673 } 674} 675 676 677void JvmtiExport::post_vm_initialized() { 678 EVT_TRIG_TRACE(JVMTI_EVENT_VM_INIT, ("Trg VM init event triggered" )); 679 680 // can now enable events 681 JvmtiEventController::vm_init(); 682 683 JvmtiEnvIterator it; 684 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 685 if (env->is_enabled(JVMTI_EVENT_VM_INIT)) { 686 EVT_TRACE(JVMTI_EVENT_VM_INIT, ("Evt VM init event sent" )); 687 688 JavaThread *thread = JavaThread::current(); 689 JvmtiThreadEventMark jem(thread); 690 JvmtiJavaThreadEventTransition jet(thread); 691 jvmtiEventVMInit callback = env->callbacks()->VMInit; 692 if (callback != NULL) { 693 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread()); 694 } 695 } 696 } 697} 698 699 700void JvmtiExport::post_vm_death() { 701 EVT_TRIG_TRACE(JVMTI_EVENT_VM_DEATH, ("Trg VM death event triggered" )); 702 703 JvmtiEnvIterator it; 704 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 705 if (env->is_enabled(JVMTI_EVENT_VM_DEATH)) { 706 EVT_TRACE(JVMTI_EVENT_VM_DEATH, ("Evt VM death event sent" )); 707 708 JavaThread *thread = JavaThread::current(); 709 JvmtiEventMark jem(thread); 710 JvmtiJavaThreadEventTransition jet(thread); 711 jvmtiEventVMDeath callback = env->callbacks()->VMDeath; 712 if (callback != NULL) { 713 (*callback)(env->jvmti_external(), jem.jni_env()); 714 } 715 } 716 } 717 718 JvmtiEnvBase::set_phase(JVMTI_PHASE_DEAD); 719 JvmtiEventController::vm_death(); 720} 721 722char** 723JvmtiExport::get_all_native_method_prefixes(int* count_ptr) { 724 // Have to grab JVMTI thread state lock to be sure environment doesn't 725 // go away while we iterate them. No locks during VM bring-up. 726 if (Threads::number_of_threads() == 0 || SafepointSynchronize::is_at_safepoint()) { 727 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr); 728 } else { 729 MutexLocker mu(JvmtiThreadState_lock); 730 return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr); 731 } 732} 733 734class JvmtiClassFileLoadHookPoster : public StackObj { 735 private: 736 Symbol* _h_name; 737 Handle _class_loader; 738 Handle _h_protection_domain; 739 unsigned char ** _data_ptr; 740 unsigned char ** _end_ptr; 741 JavaThread * _thread; 742 jint _curr_len; 743 unsigned char * _curr_data; 744 JvmtiEnv * _curr_env; 745 JvmtiCachedClassFileData ** _cached_class_file_ptr; 746 JvmtiThreadState * _state; 747 KlassHandle * _h_class_being_redefined; 748 JvmtiClassLoadKind _load_kind; 749 750 public: 751 inline JvmtiClassFileLoadHookPoster(Symbol* h_name, Handle class_loader, 752 Handle h_protection_domain, 753 unsigned char **data_ptr, unsigned char **end_ptr, 754 JvmtiCachedClassFileData **cache_ptr) { 755 _h_name = h_name; 756 _class_loader = class_loader; 757 _h_protection_domain = h_protection_domain; 758 _data_ptr = data_ptr; 759 _end_ptr = end_ptr; 760 _thread = JavaThread::current(); 761 _curr_len = *end_ptr - *data_ptr; 762 _curr_data = *data_ptr; 763 _curr_env = NULL; 764 _cached_class_file_ptr = cache_ptr; 765 766 _state = _thread->jvmti_thread_state(); 767 if (_state != NULL) { 768 _h_class_being_redefined = _state->get_class_being_redefined(); 769 _load_kind = _state->get_class_load_kind(); 770 Klass* klass = (_h_class_being_redefined == NULL) ? NULL : (*_h_class_being_redefined)(); 771 if (_load_kind != jvmti_class_load_kind_load && klass != NULL) { 772 ModuleEntry* module_entry = InstanceKlass::cast(klass)->module(); 773 assert(module_entry != NULL, "module_entry should always be set"); 774 if (module_entry->is_named() && 775 module_entry->module() != NULL && 776 !module_entry->has_default_read_edges()) { 777 if (!module_entry->set_has_default_read_edges()) { 778 // We won a potential race. 779 // Add read edges to the unnamed modules of the bootstrap and app class loaders 780 Handle class_module(_thread, JNIHandles::resolve(module_entry->module())); // Obtain j.l.r.Module 781 JvmtiExport::add_default_read_edges(class_module, _thread); 782 } 783 } 784 } 785 // Clear class_being_redefined flag here. The action 786 // from agent handler could generate a new class file load 787 // hook event and if it is not cleared the new event generated 788 // from regular class file load could have this stale redefined 789 // class handle info. 790 _state->clear_class_being_redefined(); 791 } else { 792 // redefine and retransform will always set the thread state 793 _h_class_being_redefined = (KlassHandle *) NULL; 794 _load_kind = jvmti_class_load_kind_load; 795 } 796 } 797 798 void post() { 799 post_all_envs(); 800 copy_modified_data(); 801 } 802 803 private: 804 void post_all_envs() { 805 if (_load_kind != jvmti_class_load_kind_retransform) { 806 // for class load and redefine, 807 // call the non-retransformable agents 808 JvmtiEnvIterator it; 809 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 810 if (!env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) { 811 // non-retransformable agents cannot retransform back, 812 // so no need to cache the original class file bytes 813 post_to_env(env, false); 814 } 815 } 816 } 817 JvmtiEnvIterator it; 818 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 819 // retransformable agents get all events 820 if (env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) { 821 // retransformable agents need to cache the original class file 822 // bytes if changes are made via the ClassFileLoadHook 823 post_to_env(env, true); 824 } 825 } 826 } 827 828 void post_to_env(JvmtiEnv* env, bool caching_needed) { 829 if (env->phase() == JVMTI_PHASE_PRIMORDIAL && !env->early_class_hook_env()) { 830 return; 831 } 832 unsigned char *new_data = NULL; 833 jint new_len = 0; 834 JvmtiClassFileLoadEventMark jem(_thread, _h_name, _class_loader, 835 _h_protection_domain, 836 _h_class_being_redefined); 837 JvmtiJavaThreadEventTransition jet(_thread); 838 jvmtiEventClassFileLoadHook callback = env->callbacks()->ClassFileLoadHook; 839 if (callback != NULL) { 840 (*callback)(env->jvmti_external(), jem.jni_env(), 841 jem.class_being_redefined(), 842 jem.jloader(), jem.class_name(), 843 jem.protection_domain(), 844 _curr_len, _curr_data, 845 &new_len, &new_data); 846 } 847 if (new_data != NULL) { 848 // this agent has modified class data. 849 if (caching_needed && *_cached_class_file_ptr == NULL) { 850 // data has been changed by the new retransformable agent 851 // and it hasn't already been cached, cache it 852 JvmtiCachedClassFileData *p; 853 p = (JvmtiCachedClassFileData *)os::malloc( 854 offset_of(JvmtiCachedClassFileData, data) + _curr_len, mtInternal); 855 if (p == NULL) { 856 vm_exit_out_of_memory(offset_of(JvmtiCachedClassFileData, data) + _curr_len, 857 OOM_MALLOC_ERROR, 858 "unable to allocate cached copy of original class bytes"); 859 } 860 p->length = _curr_len; 861 memcpy(p->data, _curr_data, _curr_len); 862 *_cached_class_file_ptr = p; 863 } 864 865 if (_curr_data != *_data_ptr) { 866 // curr_data is previous agent modified class data. 867 // And this has been changed by the new agent so 868 // we can delete it now. 869 _curr_env->Deallocate(_curr_data); 870 } 871 872 // Class file data has changed by the current agent. 873 _curr_data = new_data; 874 _curr_len = new_len; 875 // Save the current agent env we need this to deallocate the 876 // memory allocated by this agent. 877 _curr_env = env; 878 } 879 } 880 881 void copy_modified_data() { 882 // if one of the agent has modified class file data. 883 // Copy modified class data to new resources array. 884 if (_curr_data != *_data_ptr) { 885 *_data_ptr = NEW_RESOURCE_ARRAY(u1, _curr_len); 886 memcpy(*_data_ptr, _curr_data, _curr_len); 887 *_end_ptr = *_data_ptr + _curr_len; 888 _curr_env->Deallocate(_curr_data); 889 } 890 } 891}; 892 893bool JvmtiExport::_should_post_class_file_load_hook = false; 894 895// this entry is for class file load hook on class load, redefine and retransform 896void JvmtiExport::post_class_file_load_hook(Symbol* h_name, 897 Handle class_loader, 898 Handle h_protection_domain, 899 unsigned char **data_ptr, 900 unsigned char **end_ptr, 901 JvmtiCachedClassFileData **cache_ptr) { 902 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 903 return; 904 } 905 906 JvmtiClassFileLoadHookPoster poster(h_name, class_loader, 907 h_protection_domain, 908 data_ptr, end_ptr, 909 cache_ptr); 910 poster.post(); 911} 912 913void JvmtiExport::report_unsupported(bool on) { 914 // If any JVMTI service is turned on, we need to exit before native code 915 // tries to access nonexistant services. 916 if (on) { 917 vm_exit_during_initialization("Java Kernel does not support JVMTI."); 918 } 919} 920 921 922static inline Klass* oop_to_klass(oop obj) { 923 Klass* k = obj->klass(); 924 925 // if the object is a java.lang.Class then return the java mirror 926 if (k == SystemDictionary::Class_klass()) { 927 if (!java_lang_Class::is_primitive(obj)) { 928 k = java_lang_Class::as_Klass(obj); 929 assert(k != NULL, "class for non-primitive mirror must exist"); 930 } 931 } 932 return k; 933} 934 935class JvmtiVMObjectAllocEventMark : public JvmtiClassEventMark { 936 private: 937 jobject _jobj; 938 jlong _size; 939 public: 940 JvmtiVMObjectAllocEventMark(JavaThread *thread, oop obj) : JvmtiClassEventMark(thread, oop_to_klass(obj)) { 941 _jobj = (jobject)to_jobject(obj); 942 _size = obj->size() * wordSize; 943 }; 944 jobject jni_jobject() { return _jobj; } 945 jlong size() { return _size; } 946}; 947 948class JvmtiCompiledMethodLoadEventMark : public JvmtiMethodEventMark { 949 private: 950 jint _code_size; 951 const void *_code_data; 952 jint _map_length; 953 jvmtiAddrLocationMap *_map; 954 const void *_compile_info; 955 public: 956 JvmtiCompiledMethodLoadEventMark(JavaThread *thread, nmethod *nm, void* compile_info_ptr = NULL) 957 : JvmtiMethodEventMark(thread,methodHandle(thread, nm->method())) { 958 _code_data = nm->insts_begin(); 959 _code_size = nm->insts_size(); 960 _compile_info = compile_info_ptr; // Set void pointer of compiledMethodLoad Event. Default value is NULL. 961 JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nm, &_map, &_map_length); 962 } 963 ~JvmtiCompiledMethodLoadEventMark() { 964 FREE_C_HEAP_ARRAY(jvmtiAddrLocationMap, _map); 965 } 966 967 jint code_size() { return _code_size; } 968 const void *code_data() { return _code_data; } 969 jint map_length() { return _map_length; } 970 const jvmtiAddrLocationMap* map() { return _map; } 971 const void *compile_info() { return _compile_info; } 972}; 973 974 975 976class JvmtiMonitorEventMark : public JvmtiThreadEventMark { 977private: 978 jobject _jobj; 979public: 980 JvmtiMonitorEventMark(JavaThread *thread, oop object) 981 : JvmtiThreadEventMark(thread){ 982 _jobj = to_jobject(object); 983 } 984 jobject jni_object() { return _jobj; } 985}; 986 987/////////////////////////////////////////////////////////////// 988// 989// pending CompiledMethodUnload support 990// 991 992void JvmtiExport::post_compiled_method_unload( 993 jmethodID method, const void *code_begin) { 994 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 995 return; 996 } 997 JavaThread* thread = JavaThread::current(); 998 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD, 999 ("[%s] method compile unload event triggered", 1000 JvmtiTrace::safe_get_thread_name(thread))); 1001 1002 // post the event for each environment that has this event enabled. 1003 JvmtiEnvIterator it; 1004 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1005 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_UNLOAD)) { 1006 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1007 continue; 1008 } 1009 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD, 1010 ("[%s] class compile method unload event sent jmethodID " PTR_FORMAT, 1011 JvmtiTrace::safe_get_thread_name(thread), p2i(method))); 1012 1013 ResourceMark rm(thread); 1014 1015 JvmtiEventMark jem(thread); 1016 JvmtiJavaThreadEventTransition jet(thread); 1017 jvmtiEventCompiledMethodUnload callback = env->callbacks()->CompiledMethodUnload; 1018 if (callback != NULL) { 1019 (*callback)(env->jvmti_external(), method, code_begin); 1020 } 1021 } 1022 } 1023} 1024 1025/////////////////////////////////////////////////////////////// 1026// 1027// JvmtiExport 1028// 1029 1030void JvmtiExport::post_raw_breakpoint(JavaThread *thread, Method* method, address location) { 1031 HandleMark hm(thread); 1032 methodHandle mh(thread, method); 1033 1034 JvmtiThreadState *state = thread->jvmti_thread_state(); 1035 if (state == NULL) { 1036 return; 1037 } 1038 EVT_TRIG_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Trg Breakpoint triggered", 1039 JvmtiTrace::safe_get_thread_name(thread))); 1040 JvmtiEnvThreadStateIterator it(state); 1041 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1042 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_BREAKPOINT); 1043 if (!ets->breakpoint_posted() && ets->is_enabled(JVMTI_EVENT_BREAKPOINT)) { 1044 ThreadState old_os_state = thread->osthread()->get_state(); 1045 thread->osthread()->set_state(BREAKPOINTED); 1046 EVT_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Evt Breakpoint sent %s.%s @ " INTX_FORMAT, 1047 JvmtiTrace::safe_get_thread_name(thread), 1048 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1049 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1050 location - mh()->code_base() )); 1051 1052 JvmtiEnv *env = ets->get_env(); 1053 JvmtiLocationEventMark jem(thread, mh, location); 1054 JvmtiJavaThreadEventTransition jet(thread); 1055 jvmtiEventBreakpoint callback = env->callbacks()->Breakpoint; 1056 if (callback != NULL) { 1057 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1058 jem.jni_methodID(), jem.location()); 1059 } 1060 1061 ets->set_breakpoint_posted(); 1062 thread->osthread()->set_state(old_os_state); 1063 } 1064 } 1065} 1066 1067////////////////////////////////////////////////////////////////////////////// 1068 1069bool JvmtiExport::_can_get_source_debug_extension = false; 1070bool JvmtiExport::_can_maintain_original_method_order = false; 1071bool JvmtiExport::_can_post_interpreter_events = false; 1072bool JvmtiExport::_can_post_on_exceptions = false; 1073bool JvmtiExport::_can_post_breakpoint = false; 1074bool JvmtiExport::_can_post_field_access = false; 1075bool JvmtiExport::_can_post_field_modification = false; 1076bool JvmtiExport::_can_post_method_entry = false; 1077bool JvmtiExport::_can_post_method_exit = false; 1078bool JvmtiExport::_can_pop_frame = false; 1079bool JvmtiExport::_can_force_early_return = false; 1080 1081bool JvmtiExport::_early_vmstart_recorded = false; 1082 1083bool JvmtiExport::_should_post_single_step = false; 1084bool JvmtiExport::_should_post_field_access = false; 1085bool JvmtiExport::_should_post_field_modification = false; 1086bool JvmtiExport::_should_post_class_load = false; 1087bool JvmtiExport::_should_post_class_prepare = false; 1088bool JvmtiExport::_should_post_class_unload = false; 1089bool JvmtiExport::_should_post_thread_life = false; 1090bool JvmtiExport::_should_clean_up_heap_objects = false; 1091bool JvmtiExport::_should_post_native_method_bind = false; 1092bool JvmtiExport::_should_post_dynamic_code_generated = false; 1093bool JvmtiExport::_should_post_data_dump = false; 1094bool JvmtiExport::_should_post_compiled_method_load = false; 1095bool JvmtiExport::_should_post_compiled_method_unload = false; 1096bool JvmtiExport::_should_post_monitor_contended_enter = false; 1097bool JvmtiExport::_should_post_monitor_contended_entered = false; 1098bool JvmtiExport::_should_post_monitor_wait = false; 1099bool JvmtiExport::_should_post_monitor_waited = false; 1100bool JvmtiExport::_should_post_garbage_collection_start = false; 1101bool JvmtiExport::_should_post_garbage_collection_finish = false; 1102bool JvmtiExport::_should_post_object_free = false; 1103bool JvmtiExport::_should_post_resource_exhausted = false; 1104bool JvmtiExport::_should_post_vm_object_alloc = false; 1105bool JvmtiExport::_should_post_on_exceptions = false; 1106 1107//////////////////////////////////////////////////////////////////////////////////////////////// 1108 1109 1110// 1111// JVMTI single step management 1112// 1113void JvmtiExport::at_single_stepping_point(JavaThread *thread, Method* method, address location) { 1114 assert(JvmtiExport::should_post_single_step(), "must be single stepping"); 1115 1116 HandleMark hm(thread); 1117 methodHandle mh(thread, method); 1118 1119 // update information about current location and post a step event 1120 JvmtiThreadState *state = thread->jvmti_thread_state(); 1121 if (state == NULL) { 1122 return; 1123 } 1124 EVT_TRIG_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Trg Single Step triggered", 1125 JvmtiTrace::safe_get_thread_name(thread))); 1126 if (!state->hide_single_stepping()) { 1127 if (state->is_pending_step_for_popframe()) { 1128 state->process_pending_step_for_popframe(); 1129 } 1130 if (state->is_pending_step_for_earlyret()) { 1131 state->process_pending_step_for_earlyret(); 1132 } 1133 JvmtiExport::post_single_step(thread, mh(), location); 1134 } 1135} 1136 1137 1138void JvmtiExport::expose_single_stepping(JavaThread *thread) { 1139 JvmtiThreadState *state = thread->jvmti_thread_state(); 1140 if (state != NULL) { 1141 state->clear_hide_single_stepping(); 1142 } 1143} 1144 1145 1146bool JvmtiExport::hide_single_stepping(JavaThread *thread) { 1147 JvmtiThreadState *state = thread->jvmti_thread_state(); 1148 if (state != NULL && state->is_enabled(JVMTI_EVENT_SINGLE_STEP)) { 1149 state->set_hide_single_stepping(); 1150 return true; 1151 } else { 1152 return false; 1153 } 1154} 1155 1156void JvmtiExport::post_class_load(JavaThread *thread, Klass* klass) { 1157 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1158 return; 1159 } 1160 HandleMark hm(thread); 1161 KlassHandle kh(thread, klass); 1162 1163 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Trg Class Load triggered", 1164 JvmtiTrace::safe_get_thread_name(thread))); 1165 JvmtiThreadState* state = thread->jvmti_thread_state(); 1166 if (state == NULL) { 1167 return; 1168 } 1169 JvmtiEnvThreadStateIterator it(state); 1170 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1171 if (ets->is_enabled(JVMTI_EVENT_CLASS_LOAD)) { 1172 JvmtiEnv *env = ets->get_env(); 1173 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1174 continue; 1175 } 1176 EVT_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Evt Class Load sent %s", 1177 JvmtiTrace::safe_get_thread_name(thread), 1178 kh()==NULL? "NULL" : kh()->external_name() )); 1179 JvmtiClassEventMark jem(thread, kh()); 1180 JvmtiJavaThreadEventTransition jet(thread); 1181 jvmtiEventClassLoad callback = env->callbacks()->ClassLoad; 1182 if (callback != NULL) { 1183 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class()); 1184 } 1185 } 1186 } 1187} 1188 1189 1190void JvmtiExport::post_class_prepare(JavaThread *thread, Klass* klass) { 1191 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1192 return; 1193 } 1194 HandleMark hm(thread); 1195 KlassHandle kh(thread, klass); 1196 1197 EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Trg Class Prepare triggered", 1198 JvmtiTrace::safe_get_thread_name(thread))); 1199 JvmtiThreadState* state = thread->jvmti_thread_state(); 1200 if (state == NULL) { 1201 return; 1202 } 1203 JvmtiEnvThreadStateIterator it(state); 1204 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1205 if (ets->is_enabled(JVMTI_EVENT_CLASS_PREPARE)) { 1206 JvmtiEnv *env = ets->get_env(); 1207 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1208 continue; 1209 } 1210 EVT_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Evt Class Prepare sent %s", 1211 JvmtiTrace::safe_get_thread_name(thread), 1212 kh()==NULL? "NULL" : kh()->external_name() )); 1213 JvmtiClassEventMark jem(thread, kh()); 1214 JvmtiJavaThreadEventTransition jet(thread); 1215 jvmtiEventClassPrepare callback = env->callbacks()->ClassPrepare; 1216 if (callback != NULL) { 1217 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class()); 1218 } 1219 } 1220 } 1221} 1222 1223void JvmtiExport::post_class_unload(Klass* klass) { 1224 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1225 return; 1226 } 1227 Thread *thread = Thread::current(); 1228 HandleMark hm(thread); 1229 KlassHandle kh(thread, klass); 1230 1231 EVT_TRIG_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Trg Class Unload triggered" )); 1232 if (JvmtiEventController::is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) { 1233 assert(thread->is_VM_thread(), "wrong thread"); 1234 1235 // get JavaThread for whom we are proxy 1236 JavaThread *real_thread = 1237 (JavaThread *)((VMThread *)thread)->vm_operation()->calling_thread(); 1238 1239 JvmtiEnvIterator it; 1240 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1241 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1242 continue; 1243 } 1244 if (env->is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) { 1245 EVT_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Evt Class Unload sent %s", 1246 kh()==NULL? "NULL" : kh()->external_name() )); 1247 1248 // do everything manually, since this is a proxy - needs special care 1249 JNIEnv* jni_env = real_thread->jni_environment(); 1250 jthread jt = (jthread)JNIHandles::make_local(real_thread, real_thread->threadObj()); 1251 jclass jk = (jclass)JNIHandles::make_local(real_thread, kh()->java_mirror()); 1252 1253 // Before we call the JVMTI agent, we have to set the state in the 1254 // thread for which we are proxying. 1255 JavaThreadState prev_state = real_thread->thread_state(); 1256 assert(((Thread *)real_thread)->is_ConcurrentGC_thread() || 1257 (real_thread->is_Java_thread() && prev_state == _thread_blocked), 1258 "should be ConcurrentGCThread or JavaThread at safepoint"); 1259 real_thread->set_thread_state(_thread_in_native); 1260 1261 jvmtiExtensionEvent callback = env->ext_callbacks()->ClassUnload; 1262 if (callback != NULL) { 1263 (*callback)(env->jvmti_external(), jni_env, jt, jk); 1264 } 1265 1266 assert(real_thread->thread_state() == _thread_in_native, 1267 "JavaThread should be in native"); 1268 real_thread->set_thread_state(prev_state); 1269 1270 JNIHandles::destroy_local(jk); 1271 JNIHandles::destroy_local(jt); 1272 } 1273 } 1274 } 1275} 1276 1277 1278void JvmtiExport::post_thread_start(JavaThread *thread) { 1279 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1280 return; 1281 } 1282 assert(thread->thread_state() == _thread_in_vm, "must be in vm state"); 1283 1284 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Trg Thread Start event triggered", 1285 JvmtiTrace::safe_get_thread_name(thread))); 1286 1287 // do JVMTI thread initialization (if needed) 1288 JvmtiEventController::thread_started(thread); 1289 1290 // Do not post thread start event for hidden java thread. 1291 if (JvmtiEventController::is_enabled(JVMTI_EVENT_THREAD_START) && 1292 !thread->is_hidden_from_external_view()) { 1293 JvmtiEnvIterator it; 1294 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1295 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1296 continue; 1297 } 1298 if (env->is_enabled(JVMTI_EVENT_THREAD_START)) { 1299 EVT_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Evt Thread Start event sent", 1300 JvmtiTrace::safe_get_thread_name(thread) )); 1301 1302 JvmtiThreadEventMark jem(thread); 1303 JvmtiJavaThreadEventTransition jet(thread); 1304 jvmtiEventThreadStart callback = env->callbacks()->ThreadStart; 1305 if (callback != NULL) { 1306 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread()); 1307 } 1308 } 1309 } 1310 } 1311} 1312 1313 1314void JvmtiExport::post_thread_end(JavaThread *thread) { 1315 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 1316 return; 1317 } 1318 EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Trg Thread End event triggered", 1319 JvmtiTrace::safe_get_thread_name(thread))); 1320 1321 JvmtiThreadState *state = thread->jvmti_thread_state(); 1322 if (state == NULL) { 1323 return; 1324 } 1325 1326 // Do not post thread end event for hidden java thread. 1327 if (state->is_enabled(JVMTI_EVENT_THREAD_END) && 1328 !thread->is_hidden_from_external_view()) { 1329 1330 JvmtiEnvThreadStateIterator it(state); 1331 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1332 if (ets->is_enabled(JVMTI_EVENT_THREAD_END)) { 1333 JvmtiEnv *env = ets->get_env(); 1334 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 1335 continue; 1336 } 1337 EVT_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Evt Thread End event sent", 1338 JvmtiTrace::safe_get_thread_name(thread) )); 1339 1340 JvmtiThreadEventMark jem(thread); 1341 JvmtiJavaThreadEventTransition jet(thread); 1342 jvmtiEventThreadEnd callback = env->callbacks()->ThreadEnd; 1343 if (callback != NULL) { 1344 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread()); 1345 } 1346 } 1347 } 1348 } 1349} 1350 1351void JvmtiExport::post_object_free(JvmtiEnv* env, jlong tag) { 1352 assert(SafepointSynchronize::is_at_safepoint(), "must be executed at safepoint"); 1353 assert(env->is_enabled(JVMTI_EVENT_OBJECT_FREE), "checking"); 1354 1355 EVT_TRIG_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Trg Object Free triggered" )); 1356 EVT_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Evt Object Free sent")); 1357 1358 jvmtiEventObjectFree callback = env->callbacks()->ObjectFree; 1359 if (callback != NULL) { 1360 (*callback)(env->jvmti_external(), tag); 1361 } 1362} 1363 1364void JvmtiExport::post_resource_exhausted(jint resource_exhausted_flags, const char* description) { 1365 EVT_TRIG_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Trg resource exhausted event triggered" )); 1366 1367 JvmtiEnvIterator it; 1368 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1369 if (env->is_enabled(JVMTI_EVENT_RESOURCE_EXHAUSTED)) { 1370 EVT_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Evt resource exhausted event sent" )); 1371 1372 JavaThread *thread = JavaThread::current(); 1373 JvmtiThreadEventMark jem(thread); 1374 JvmtiJavaThreadEventTransition jet(thread); 1375 jvmtiEventResourceExhausted callback = env->callbacks()->ResourceExhausted; 1376 if (callback != NULL) { 1377 (*callback)(env->jvmti_external(), jem.jni_env(), 1378 resource_exhausted_flags, NULL, description); 1379 } 1380 } 1381 } 1382} 1383 1384void JvmtiExport::post_method_entry(JavaThread *thread, Method* method, frame current_frame) { 1385 HandleMark hm(thread); 1386 methodHandle mh(thread, method); 1387 1388 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Trg Method Entry triggered %s.%s", 1389 JvmtiTrace::safe_get_thread_name(thread), 1390 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1391 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1392 1393 JvmtiThreadState* state = thread->jvmti_thread_state(); 1394 if (state == NULL || !state->is_interp_only_mode()) { 1395 // for any thread that actually wants method entry, interp_only_mode is set 1396 return; 1397 } 1398 1399 state->incr_cur_stack_depth(); 1400 1401 if (state->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) { 1402 JvmtiEnvThreadStateIterator it(state); 1403 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1404 if (ets->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) { 1405 EVT_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Evt Method Entry sent %s.%s", 1406 JvmtiTrace::safe_get_thread_name(thread), 1407 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1408 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1409 1410 JvmtiEnv *env = ets->get_env(); 1411 JvmtiMethodEventMark jem(thread, mh); 1412 JvmtiJavaThreadEventTransition jet(thread); 1413 jvmtiEventMethodEntry callback = env->callbacks()->MethodEntry; 1414 if (callback != NULL) { 1415 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_methodID()); 1416 } 1417 } 1418 } 1419 } 1420} 1421 1422void JvmtiExport::post_method_exit(JavaThread *thread, Method* method, frame current_frame) { 1423 HandleMark hm(thread); 1424 methodHandle mh(thread, method); 1425 1426 EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Trg Method Exit triggered %s.%s", 1427 JvmtiTrace::safe_get_thread_name(thread), 1428 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1429 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1430 1431 JvmtiThreadState *state = thread->jvmti_thread_state(); 1432 if (state == NULL || !state->is_interp_only_mode()) { 1433 // for any thread that actually wants method exit, interp_only_mode is set 1434 return; 1435 } 1436 1437 // return a flag when a method terminates by throwing an exception 1438 // i.e. if an exception is thrown and it's not caught by the current method 1439 bool exception_exit = state->is_exception_detected() && !state->is_exception_caught(); 1440 1441 1442 if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) { 1443 Handle result; 1444 jvalue value; 1445 value.j = 0L; 1446 1447 // if the method hasn't been popped because of an exception then we populate 1448 // the return_value parameter for the callback. At this point we only have 1449 // the address of a "raw result" and we just call into the interpreter to 1450 // convert this into a jvalue. 1451 if (!exception_exit) { 1452 oop oop_result; 1453 BasicType type = current_frame.interpreter_frame_result(&oop_result, &value); 1454 if (type == T_OBJECT || type == T_ARRAY) { 1455 result = Handle(thread, oop_result); 1456 } 1457 } 1458 1459 JvmtiEnvThreadStateIterator it(state); 1460 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1461 if (ets->is_enabled(JVMTI_EVENT_METHOD_EXIT)) { 1462 EVT_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Evt Method Exit sent %s.%s", 1463 JvmtiTrace::safe_get_thread_name(thread), 1464 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1465 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1466 1467 JvmtiEnv *env = ets->get_env(); 1468 JvmtiMethodEventMark jem(thread, mh); 1469 if (result.not_null()) { 1470 value.l = JNIHandles::make_local(thread, result()); 1471 } 1472 JvmtiJavaThreadEventTransition jet(thread); 1473 jvmtiEventMethodExit callback = env->callbacks()->MethodExit; 1474 if (callback != NULL) { 1475 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1476 jem.jni_methodID(), exception_exit, value); 1477 } 1478 } 1479 } 1480 } 1481 1482 if (state->is_enabled(JVMTI_EVENT_FRAME_POP)) { 1483 JvmtiEnvThreadStateIterator it(state); 1484 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1485 int cur_frame_number = state->cur_stack_depth(); 1486 1487 if (ets->is_frame_pop(cur_frame_number)) { 1488 // we have a NotifyFramePop entry for this frame. 1489 // now check that this env/thread wants this event 1490 if (ets->is_enabled(JVMTI_EVENT_FRAME_POP)) { 1491 EVT_TRACE(JVMTI_EVENT_FRAME_POP, ("[%s] Evt Frame Pop sent %s.%s", 1492 JvmtiTrace::safe_get_thread_name(thread), 1493 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1494 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() )); 1495 1496 // we also need to issue a frame pop event for this frame 1497 JvmtiEnv *env = ets->get_env(); 1498 JvmtiMethodEventMark jem(thread, mh); 1499 JvmtiJavaThreadEventTransition jet(thread); 1500 jvmtiEventFramePop callback = env->callbacks()->FramePop; 1501 if (callback != NULL) { 1502 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1503 jem.jni_methodID(), exception_exit); 1504 } 1505 } 1506 // remove the frame's entry 1507 ets->clear_frame_pop(cur_frame_number); 1508 } 1509 } 1510 } 1511 1512 state->decr_cur_stack_depth(); 1513} 1514 1515 1516// Todo: inline this for optimization 1517void JvmtiExport::post_single_step(JavaThread *thread, Method* method, address location) { 1518 HandleMark hm(thread); 1519 methodHandle mh(thread, method); 1520 1521 JvmtiThreadState *state = thread->jvmti_thread_state(); 1522 if (state == NULL) { 1523 return; 1524 } 1525 JvmtiEnvThreadStateIterator it(state); 1526 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1527 ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_SINGLE_STEP); 1528 if (!ets->single_stepping_posted() && ets->is_enabled(JVMTI_EVENT_SINGLE_STEP)) { 1529 EVT_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Evt Single Step sent %s.%s @ " INTX_FORMAT, 1530 JvmtiTrace::safe_get_thread_name(thread), 1531 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1532 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1533 location - mh()->code_base() )); 1534 1535 JvmtiEnv *env = ets->get_env(); 1536 JvmtiLocationEventMark jem(thread, mh, location); 1537 JvmtiJavaThreadEventTransition jet(thread); 1538 jvmtiEventSingleStep callback = env->callbacks()->SingleStep; 1539 if (callback != NULL) { 1540 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1541 jem.jni_methodID(), jem.location()); 1542 } 1543 1544 ets->set_single_stepping_posted(); 1545 } 1546 } 1547} 1548 1549 1550void JvmtiExport::post_exception_throw(JavaThread *thread, Method* method, address location, oop exception) { 1551 HandleMark hm(thread); 1552 methodHandle mh(thread, method); 1553 Handle exception_handle(thread, exception); 1554 1555 JvmtiThreadState *state = thread->jvmti_thread_state(); 1556 if (state == NULL) { 1557 return; 1558 } 1559 1560 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION, ("[%s] Trg Exception thrown triggered", 1561 JvmtiTrace::safe_get_thread_name(thread))); 1562 if (!state->is_exception_detected()) { 1563 state->set_exception_detected(); 1564 JvmtiEnvThreadStateIterator it(state); 1565 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1566 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION) && (exception != NULL)) { 1567 1568 EVT_TRACE(JVMTI_EVENT_EXCEPTION, 1569 ("[%s] Evt Exception thrown sent %s.%s @ " INTX_FORMAT, 1570 JvmtiTrace::safe_get_thread_name(thread), 1571 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1572 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1573 location - mh()->code_base() )); 1574 1575 JvmtiEnv *env = ets->get_env(); 1576 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle); 1577 1578 // It's okay to clear these exceptions here because we duplicate 1579 // this lookup in InterpreterRuntime::exception_handler_for_exception. 1580 EXCEPTION_MARK; 1581 1582 bool should_repeat; 1583 vframeStream st(thread); 1584 assert(!st.at_end(), "cannot be at end"); 1585 Method* current_method = NULL; 1586 // A GC may occur during the Method::fast_exception_handler_bci_for() 1587 // call below if it needs to load the constraint class. Using a 1588 // methodHandle to keep the 'current_method' from being deallocated 1589 // if GC happens. 1590 methodHandle current_mh = methodHandle(thread, current_method); 1591 int current_bci = -1; 1592 do { 1593 current_method = st.method(); 1594 current_mh = methodHandle(thread, current_method); 1595 current_bci = st.bci(); 1596 do { 1597 should_repeat = false; 1598 KlassHandle eh_klass(thread, exception_handle()->klass()); 1599 current_bci = Method::fast_exception_handler_bci_for( 1600 current_mh, eh_klass, current_bci, THREAD); 1601 if (HAS_PENDING_EXCEPTION) { 1602 exception_handle = Handle(thread, PENDING_EXCEPTION); 1603 CLEAR_PENDING_EXCEPTION; 1604 should_repeat = true; 1605 } 1606 } while (should_repeat && (current_bci != -1)); 1607 st.next(); 1608 } while ((current_bci < 0) && (!st.at_end())); 1609 1610 jmethodID catch_jmethodID; 1611 if (current_bci < 0) { 1612 catch_jmethodID = 0; 1613 current_bci = 0; 1614 } else { 1615 catch_jmethodID = jem.to_jmethodID(current_mh); 1616 } 1617 1618 JvmtiJavaThreadEventTransition jet(thread); 1619 jvmtiEventException callback = env->callbacks()->Exception; 1620 if (callback != NULL) { 1621 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1622 jem.jni_methodID(), jem.location(), 1623 jem.exception(), 1624 catch_jmethodID, current_bci); 1625 } 1626 } 1627 } 1628 } 1629 1630 // frames may get popped because of this throw, be safe - invalidate cached depth 1631 state->invalidate_cur_stack_depth(); 1632} 1633 1634 1635void JvmtiExport::notice_unwind_due_to_exception(JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) { 1636 HandleMark hm(thread); 1637 methodHandle mh(thread, method); 1638 Handle exception_handle(thread, exception); 1639 1640 JvmtiThreadState *state = thread->jvmti_thread_state(); 1641 if (state == NULL) { 1642 return; 1643 } 1644 EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION_CATCH, 1645 ("[%s] Trg unwind_due_to_exception triggered %s.%s @ %s" INTX_FORMAT " - %s", 1646 JvmtiTrace::safe_get_thread_name(thread), 1647 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1648 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1649 location==0? "no location:" : "", 1650 location==0? 0 : location - mh()->code_base(), 1651 in_handler_frame? "in handler frame" : "not handler frame" )); 1652 1653 if (state->is_exception_detected()) { 1654 1655 state->invalidate_cur_stack_depth(); 1656 if (!in_handler_frame) { 1657 // Not in exception handler. 1658 if(state->is_interp_only_mode()) { 1659 // method exit and frame pop events are posted only in interp mode. 1660 // When these events are enabled code should be in running in interp mode. 1661 JvmtiExport::post_method_exit(thread, method, thread->last_frame()); 1662 // The cached cur_stack_depth might have changed from the 1663 // operations of frame pop or method exit. We are not 100% sure 1664 // the cached cur_stack_depth is still valid depth so invalidate 1665 // it. 1666 state->invalidate_cur_stack_depth(); 1667 } 1668 } else { 1669 // In exception handler frame. Report exception catch. 1670 assert(location != NULL, "must be a known location"); 1671 // Update cur_stack_depth - the frames above the current frame 1672 // have been unwound due to this exception: 1673 assert(!state->is_exception_caught(), "exception must not be caught yet."); 1674 state->set_exception_caught(); 1675 1676 JvmtiEnvThreadStateIterator it(state); 1677 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1678 if (ets->is_enabled(JVMTI_EVENT_EXCEPTION_CATCH) && (exception_handle() != NULL)) { 1679 EVT_TRACE(JVMTI_EVENT_EXCEPTION_CATCH, 1680 ("[%s] Evt ExceptionCatch sent %s.%s @ " INTX_FORMAT, 1681 JvmtiTrace::safe_get_thread_name(thread), 1682 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1683 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1684 location - mh()->code_base() )); 1685 1686 JvmtiEnv *env = ets->get_env(); 1687 JvmtiExceptionEventMark jem(thread, mh, location, exception_handle); 1688 JvmtiJavaThreadEventTransition jet(thread); 1689 jvmtiEventExceptionCatch callback = env->callbacks()->ExceptionCatch; 1690 if (callback != NULL) { 1691 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1692 jem.jni_methodID(), jem.location(), 1693 jem.exception()); 1694 } 1695 } 1696 } 1697 } 1698 } 1699} 1700 1701oop JvmtiExport::jni_GetField_probe(JavaThread *thread, jobject jobj, oop obj, 1702 Klass* klass, jfieldID fieldID, bool is_static) { 1703 if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) { 1704 // At least one field access watch is set so we have more work 1705 // to do. This wrapper is used by entry points that allow us 1706 // to create handles in post_field_access_by_jni(). 1707 post_field_access_by_jni(thread, obj, klass, fieldID, is_static); 1708 // event posting can block so refetch oop if we were passed a jobj 1709 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj); 1710 } 1711 return obj; 1712} 1713 1714oop JvmtiExport::jni_GetField_probe_nh(JavaThread *thread, jobject jobj, oop obj, 1715 Klass* klass, jfieldID fieldID, bool is_static) { 1716 if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) { 1717 // At least one field access watch is set so we have more work 1718 // to do. This wrapper is used by "quick" entry points that don't 1719 // allow us to create handles in post_field_access_by_jni(). We 1720 // override that with a ResetNoHandleMark. 1721 ResetNoHandleMark rnhm; 1722 post_field_access_by_jni(thread, obj, klass, fieldID, is_static); 1723 // event posting can block so refetch oop if we were passed a jobj 1724 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj); 1725 } 1726 return obj; 1727} 1728 1729void JvmtiExport::post_field_access_by_jni(JavaThread *thread, oop obj, 1730 Klass* klass, jfieldID fieldID, bool is_static) { 1731 // We must be called with a Java context in order to provide reasonable 1732 // values for the klazz, method, and location fields. The callers of this 1733 // function don't make the call unless there is a Java context. 1734 assert(thread->has_last_Java_frame(), "must be called with a Java context"); 1735 1736 ResourceMark rm; 1737 fieldDescriptor fd; 1738 // if get_field_descriptor finds fieldID to be invalid, then we just bail 1739 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd); 1740 assert(valid_fieldID == true,"post_field_access_by_jni called with invalid fieldID"); 1741 if (!valid_fieldID) return; 1742 // field accesses are not watched so bail 1743 if (!fd.is_field_access_watched()) return; 1744 1745 HandleMark hm(thread); 1746 KlassHandle h_klass(thread, klass); 1747 Handle h_obj; 1748 if (!is_static) { 1749 // non-static field accessors have an object, but we need a handle 1750 assert(obj != NULL, "non-static needs an object"); 1751 h_obj = Handle(thread, obj); 1752 } 1753 post_field_access(thread, 1754 thread->last_frame().interpreter_frame_method(), 1755 thread->last_frame().interpreter_frame_bcp(), 1756 h_klass, h_obj, fieldID); 1757} 1758 1759void JvmtiExport::post_field_access(JavaThread *thread, Method* method, 1760 address location, KlassHandle field_klass, Handle object, jfieldID field) { 1761 1762 HandleMark hm(thread); 1763 methodHandle mh(thread, method); 1764 1765 JvmtiThreadState *state = thread->jvmti_thread_state(); 1766 if (state == NULL) { 1767 return; 1768 } 1769 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Trg Field Access event triggered", 1770 JvmtiTrace::safe_get_thread_name(thread))); 1771 JvmtiEnvThreadStateIterator it(state); 1772 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1773 if (ets->is_enabled(JVMTI_EVENT_FIELD_ACCESS)) { 1774 EVT_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Evt Field Access event sent %s.%s @ " INTX_FORMAT, 1775 JvmtiTrace::safe_get_thread_name(thread), 1776 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1777 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1778 location - mh()->code_base() )); 1779 1780 JvmtiEnv *env = ets->get_env(); 1781 JvmtiLocationEventMark jem(thread, mh, location); 1782 jclass field_jclass = jem.to_jclass(field_klass()); 1783 jobject field_jobject = jem.to_jobject(object()); 1784 JvmtiJavaThreadEventTransition jet(thread); 1785 jvmtiEventFieldAccess callback = env->callbacks()->FieldAccess; 1786 if (callback != NULL) { 1787 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1788 jem.jni_methodID(), jem.location(), 1789 field_jclass, field_jobject, field); 1790 } 1791 } 1792 } 1793} 1794 1795oop JvmtiExport::jni_SetField_probe(JavaThread *thread, jobject jobj, oop obj, 1796 Klass* klass, jfieldID fieldID, bool is_static, 1797 char sig_type, jvalue *value) { 1798 if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) { 1799 // At least one field modification watch is set so we have more work 1800 // to do. This wrapper is used by entry points that allow us 1801 // to create handles in post_field_modification_by_jni(). 1802 post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value); 1803 // event posting can block so refetch oop if we were passed a jobj 1804 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj); 1805 } 1806 return obj; 1807} 1808 1809oop JvmtiExport::jni_SetField_probe_nh(JavaThread *thread, jobject jobj, oop obj, 1810 Klass* klass, jfieldID fieldID, bool is_static, 1811 char sig_type, jvalue *value) { 1812 if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) { 1813 // At least one field modification watch is set so we have more work 1814 // to do. This wrapper is used by "quick" entry points that don't 1815 // allow us to create handles in post_field_modification_by_jni(). We 1816 // override that with a ResetNoHandleMark. 1817 ResetNoHandleMark rnhm; 1818 post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value); 1819 // event posting can block so refetch oop if we were passed a jobj 1820 if (jobj != NULL) return JNIHandles::resolve_non_null(jobj); 1821 } 1822 return obj; 1823} 1824 1825void JvmtiExport::post_field_modification_by_jni(JavaThread *thread, oop obj, 1826 Klass* klass, jfieldID fieldID, bool is_static, 1827 char sig_type, jvalue *value) { 1828 // We must be called with a Java context in order to provide reasonable 1829 // values for the klazz, method, and location fields. The callers of this 1830 // function don't make the call unless there is a Java context. 1831 assert(thread->has_last_Java_frame(), "must be called with Java context"); 1832 1833 ResourceMark rm; 1834 fieldDescriptor fd; 1835 // if get_field_descriptor finds fieldID to be invalid, then we just bail 1836 bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd); 1837 assert(valid_fieldID == true,"post_field_modification_by_jni called with invalid fieldID"); 1838 if (!valid_fieldID) return; 1839 // field modifications are not watched so bail 1840 if (!fd.is_field_modification_watched()) return; 1841 1842 HandleMark hm(thread); 1843 1844 Handle h_obj; 1845 if (!is_static) { 1846 // non-static field accessors have an object, but we need a handle 1847 assert(obj != NULL, "non-static needs an object"); 1848 h_obj = Handle(thread, obj); 1849 } 1850 KlassHandle h_klass(thread, klass); 1851 post_field_modification(thread, 1852 thread->last_frame().interpreter_frame_method(), 1853 thread->last_frame().interpreter_frame_bcp(), 1854 h_klass, h_obj, fieldID, sig_type, value); 1855} 1856 1857void JvmtiExport::post_raw_field_modification(JavaThread *thread, Method* method, 1858 address location, KlassHandle field_klass, Handle object, jfieldID field, 1859 char sig_type, jvalue *value) { 1860 1861 if (sig_type == 'I' || sig_type == 'Z' || sig_type == 'B' || sig_type == 'C' || sig_type == 'S') { 1862 // 'I' instructions are used for byte, char, short and int. 1863 // determine which it really is, and convert 1864 fieldDescriptor fd; 1865 bool found = JvmtiEnv::get_field_descriptor(field_klass(), field, &fd); 1866 // should be found (if not, leave as is) 1867 if (found) { 1868 jint ival = value->i; 1869 // convert value from int to appropriate type 1870 switch (fd.field_type()) { 1871 case T_BOOLEAN: 1872 sig_type = 'Z'; 1873 value->i = 0; // clear it 1874 value->z = (jboolean)ival; 1875 break; 1876 case T_BYTE: 1877 sig_type = 'B'; 1878 value->i = 0; // clear it 1879 value->b = (jbyte)ival; 1880 break; 1881 case T_CHAR: 1882 sig_type = 'C'; 1883 value->i = 0; // clear it 1884 value->c = (jchar)ival; 1885 break; 1886 case T_SHORT: 1887 sig_type = 'S'; 1888 value->i = 0; // clear it 1889 value->s = (jshort)ival; 1890 break; 1891 case T_INT: 1892 // nothing to do 1893 break; 1894 default: 1895 // this is an integer instruction, should be one of above 1896 ShouldNotReachHere(); 1897 break; 1898 } 1899 } 1900 } 1901 1902 assert(sig_type != '[', "array should have sig_type == 'L'"); 1903 bool handle_created = false; 1904 1905 // convert oop to JNI handle. 1906 if (sig_type == 'L') { 1907 handle_created = true; 1908 value->l = (jobject)JNIHandles::make_local(thread, (oop)value->l); 1909 } 1910 1911 post_field_modification(thread, method, location, field_klass, object, field, sig_type, value); 1912 1913 // Destroy the JNI handle allocated above. 1914 if (handle_created) { 1915 JNIHandles::destroy_local(value->l); 1916 } 1917} 1918 1919void JvmtiExport::post_field_modification(JavaThread *thread, Method* method, 1920 address location, KlassHandle field_klass, Handle object, jfieldID field, 1921 char sig_type, jvalue *value_ptr) { 1922 1923 HandleMark hm(thread); 1924 methodHandle mh(thread, method); 1925 1926 JvmtiThreadState *state = thread->jvmti_thread_state(); 1927 if (state == NULL) { 1928 return; 1929 } 1930 EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_MODIFICATION, 1931 ("[%s] Trg Field Modification event triggered", 1932 JvmtiTrace::safe_get_thread_name(thread))); 1933 1934 JvmtiEnvThreadStateIterator it(state); 1935 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 1936 if (ets->is_enabled(JVMTI_EVENT_FIELD_MODIFICATION)) { 1937 EVT_TRACE(JVMTI_EVENT_FIELD_MODIFICATION, 1938 ("[%s] Evt Field Modification event sent %s.%s @ " INTX_FORMAT, 1939 JvmtiTrace::safe_get_thread_name(thread), 1940 (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(), 1941 (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(), 1942 location - mh()->code_base() )); 1943 1944 JvmtiEnv *env = ets->get_env(); 1945 JvmtiLocationEventMark jem(thread, mh, location); 1946 jclass field_jclass = jem.to_jclass(field_klass()); 1947 jobject field_jobject = jem.to_jobject(object()); 1948 JvmtiJavaThreadEventTransition jet(thread); 1949 jvmtiEventFieldModification callback = env->callbacks()->FieldModification; 1950 if (callback != NULL) { 1951 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 1952 jem.jni_methodID(), jem.location(), 1953 field_jclass, field_jobject, field, sig_type, *value_ptr); 1954 } 1955 } 1956 } 1957} 1958 1959void JvmtiExport::post_native_method_bind(Method* method, address* function_ptr) { 1960 JavaThread* thread = JavaThread::current(); 1961 assert(thread->thread_state() == _thread_in_vm, "must be in vm state"); 1962 1963 HandleMark hm(thread); 1964 methodHandle mh(thread, method); 1965 1966 EVT_TRIG_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Trg Native Method Bind event triggered", 1967 JvmtiTrace::safe_get_thread_name(thread))); 1968 1969 if (JvmtiEventController::is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) { 1970 JvmtiEnvIterator it; 1971 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 1972 if (env->is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) { 1973 EVT_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Evt Native Method Bind event sent", 1974 JvmtiTrace::safe_get_thread_name(thread) )); 1975 1976 JvmtiMethodEventMark jem(thread, mh); 1977 JvmtiJavaThreadEventTransition jet(thread); 1978 JNIEnv* jni_env = (env->phase() == JVMTI_PHASE_PRIMORDIAL) ? NULL : jem.jni_env(); 1979 jvmtiEventNativeMethodBind callback = env->callbacks()->NativeMethodBind; 1980 if (callback != NULL) { 1981 (*callback)(env->jvmti_external(), jni_env, jem.jni_thread(), 1982 jem.jni_methodID(), (void*)(*function_ptr), (void**)function_ptr); 1983 } 1984 } 1985 } 1986 } 1987} 1988 1989// Returns a record containing inlining information for the given nmethod 1990jvmtiCompiledMethodLoadInlineRecord* create_inline_record(nmethod* nm) { 1991 jint numstackframes = 0; 1992 jvmtiCompiledMethodLoadInlineRecord* record = (jvmtiCompiledMethodLoadInlineRecord*)NEW_RESOURCE_OBJ(jvmtiCompiledMethodLoadInlineRecord); 1993 record->header.kind = JVMTI_CMLR_INLINE_INFO; 1994 record->header.next = NULL; 1995 record->header.majorinfoversion = JVMTI_CMLR_MAJOR_VERSION_1; 1996 record->header.minorinfoversion = JVMTI_CMLR_MINOR_VERSION_0; 1997 record->numpcs = 0; 1998 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) { 1999 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue; 2000 record->numpcs++; 2001 } 2002 record->pcinfo = (PCStackInfo*)(NEW_RESOURCE_ARRAY(PCStackInfo, record->numpcs)); 2003 int scope = 0; 2004 for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) { 2005 if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue; 2006 void* pc_address = (void*)p->real_pc(nm); 2007 assert(pc_address != NULL, "pc_address must be non-null"); 2008 record->pcinfo[scope].pc = pc_address; 2009 numstackframes=0; 2010 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != NULL;sd = sd->sender()) { 2011 numstackframes++; 2012 } 2013 assert(numstackframes != 0, "numstackframes must be nonzero."); 2014 record->pcinfo[scope].methods = (jmethodID *)NEW_RESOURCE_ARRAY(jmethodID, numstackframes); 2015 record->pcinfo[scope].bcis = (jint *)NEW_RESOURCE_ARRAY(jint, numstackframes); 2016 record->pcinfo[scope].numstackframes = numstackframes; 2017 int stackframe = 0; 2018 for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != NULL;sd = sd->sender()) { 2019 // 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() 2020 assert(sd->method() != NULL, "sd->method() cannot be null."); 2021 record->pcinfo[scope].methods[stackframe] = sd->method()->jmethod_id(); 2022 record->pcinfo[scope].bcis[stackframe] = sd->bci(); 2023 stackframe++; 2024 } 2025 scope++; 2026 } 2027 return record; 2028} 2029 2030void JvmtiExport::post_compiled_method_load(nmethod *nm) { 2031 if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) { 2032 return; 2033 } 2034 JavaThread* thread = JavaThread::current(); 2035 2036 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD, 2037 ("[%s] method compile load event triggered", 2038 JvmtiTrace::safe_get_thread_name(thread))); 2039 2040 JvmtiEnvIterator it; 2041 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2042 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) { 2043 if (env->phase() == JVMTI_PHASE_PRIMORDIAL) { 2044 continue; 2045 } 2046 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD, 2047 ("[%s] class compile method load event sent %s.%s ", 2048 JvmtiTrace::safe_get_thread_name(thread), 2049 (nm->method() == NULL) ? "NULL" : nm->method()->klass_name()->as_C_string(), 2050 (nm->method() == NULL) ? "NULL" : nm->method()->name()->as_C_string())); 2051 ResourceMark rm(thread); 2052 HandleMark hm(thread); 2053 2054 // Add inlining information 2055 jvmtiCompiledMethodLoadInlineRecord* inlinerecord = create_inline_record(nm); 2056 // Pass inlining information through the void pointer 2057 JvmtiCompiledMethodLoadEventMark jem(thread, nm, inlinerecord); 2058 JvmtiJavaThreadEventTransition jet(thread); 2059 jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad; 2060 if (callback != NULL) { 2061 (*callback)(env->jvmti_external(), jem.jni_methodID(), 2062 jem.code_size(), jem.code_data(), jem.map_length(), 2063 jem.map(), jem.compile_info()); 2064 } 2065 } 2066 } 2067} 2068 2069 2070// post a COMPILED_METHOD_LOAD event for a given environment 2071void JvmtiExport::post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length, 2072 const void *code_begin, const jint map_length, 2073 const jvmtiAddrLocationMap* map) 2074{ 2075 if (env->phase() <= JVMTI_PHASE_PRIMORDIAL) { 2076 return; 2077 } 2078 JavaThread* thread = JavaThread::current(); 2079 EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD, 2080 ("[%s] method compile load event triggered (by GenerateEvents)", 2081 JvmtiTrace::safe_get_thread_name(thread))); 2082 if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) { 2083 2084 EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD, 2085 ("[%s] class compile method load event sent (by GenerateEvents), jmethodID=" PTR_FORMAT, 2086 JvmtiTrace::safe_get_thread_name(thread), p2i(method))); 2087 2088 JvmtiEventMark jem(thread); 2089 JvmtiJavaThreadEventTransition jet(thread); 2090 jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad; 2091 if (callback != NULL) { 2092 (*callback)(env->jvmti_external(), method, 2093 length, code_begin, map_length, 2094 map, NULL); 2095 } 2096 } 2097} 2098 2099void JvmtiExport::post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) { 2100 assert(name != NULL && name[0] != '\0', "sanity check"); 2101 2102 JavaThread* thread = JavaThread::current(); 2103 // In theory everyone coming thru here is in_vm but we need to be certain 2104 // because a callee will do a vm->native transition 2105 ThreadInVMfromUnknown __tiv; 2106 2107 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED, 2108 ("[%s] method dynamic code generated event triggered", 2109 JvmtiTrace::safe_get_thread_name(thread))); 2110 JvmtiEnvIterator it; 2111 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2112 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) { 2113 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED, 2114 ("[%s] dynamic code generated event sent for %s", 2115 JvmtiTrace::safe_get_thread_name(thread), name)); 2116 JvmtiEventMark jem(thread); 2117 JvmtiJavaThreadEventTransition jet(thread); 2118 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char)); 2119 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated; 2120 if (callback != NULL) { 2121 (*callback)(env->jvmti_external(), name, (void*)code_begin, length); 2122 } 2123 } 2124 } 2125} 2126 2127void JvmtiExport::post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) { 2128 jvmtiPhase phase = JvmtiEnv::get_phase(); 2129 if (phase == JVMTI_PHASE_PRIMORDIAL || phase == JVMTI_PHASE_START) { 2130 post_dynamic_code_generated_internal(name, code_begin, code_end); 2131 } else { 2132 // It may not be safe to post the event from this thread. Defer all 2133 // postings to the service thread so that it can perform them in a safe 2134 // context and in-order. 2135 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 2136 JvmtiDeferredEvent event = JvmtiDeferredEvent::dynamic_code_generated_event( 2137 name, code_begin, code_end); 2138 JvmtiDeferredEventQueue::enqueue(event); 2139 } 2140} 2141 2142 2143// post a DYNAMIC_CODE_GENERATED event for a given environment 2144// used by GenerateEvents 2145void JvmtiExport::post_dynamic_code_generated(JvmtiEnv* env, const char *name, 2146 const void *code_begin, const void *code_end) 2147{ 2148 JavaThread* thread = JavaThread::current(); 2149 EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED, 2150 ("[%s] dynamic code generated event triggered (by GenerateEvents)", 2151 JvmtiTrace::safe_get_thread_name(thread))); 2152 if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) { 2153 EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED, 2154 ("[%s] dynamic code generated event sent for %s", 2155 JvmtiTrace::safe_get_thread_name(thread), name)); 2156 JvmtiEventMark jem(thread); 2157 JvmtiJavaThreadEventTransition jet(thread); 2158 jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char)); 2159 jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated; 2160 if (callback != NULL) { 2161 (*callback)(env->jvmti_external(), name, (void*)code_begin, length); 2162 } 2163 } 2164} 2165 2166// post a DynamicCodeGenerated event while holding locks in the VM. 2167void JvmtiExport::post_dynamic_code_generated_while_holding_locks(const char* name, 2168 address code_begin, address code_end) 2169{ 2170 // register the stub with the current dynamic code event collector 2171 JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current()); 2172 // state can only be NULL if the current thread is exiting which 2173 // should not happen since we're trying to post an event 2174 guarantee(state != NULL, "attempt to register stub via an exiting thread"); 2175 JvmtiDynamicCodeEventCollector* collector = state->get_dynamic_code_event_collector(); 2176 guarantee(collector != NULL, "attempt to register stub without event collector"); 2177 collector->register_stub(name, code_begin, code_end); 2178} 2179 2180// Collect all the vm internally allocated objects which are visible to java world 2181void JvmtiExport::record_vm_internal_object_allocation(oop obj) { 2182 Thread* thread = Thread::current_or_null(); 2183 if (thread != NULL && thread->is_Java_thread()) { 2184 // Can not take safepoint here. 2185 NoSafepointVerifier no_sfpt; 2186 // Can not take safepoint here so can not use state_for to get 2187 // jvmti thread state. 2188 JvmtiThreadState *state = ((JavaThread*)thread)->jvmti_thread_state(); 2189 if (state != NULL ) { 2190 // state is non NULL when VMObjectAllocEventCollector is enabled. 2191 JvmtiVMObjectAllocEventCollector *collector; 2192 collector = state->get_vm_object_alloc_event_collector(); 2193 if (collector != NULL && collector->is_enabled()) { 2194 // Don't record classes as these will be notified via the ClassLoad 2195 // event. 2196 if (obj->klass() != SystemDictionary::Class_klass()) { 2197 collector->record_allocation(obj); 2198 } 2199 } 2200 } 2201 } 2202} 2203 2204void JvmtiExport::post_garbage_collection_finish() { 2205 Thread *thread = Thread::current(); // this event is posted from VM-Thread. 2206 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH, 2207 ("[%s] garbage collection finish event triggered", 2208 JvmtiTrace::safe_get_thread_name(thread))); 2209 JvmtiEnvIterator it; 2210 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2211 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH)) { 2212 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH, 2213 ("[%s] garbage collection finish event sent", 2214 JvmtiTrace::safe_get_thread_name(thread))); 2215 JvmtiThreadEventTransition jet(thread); 2216 // JNIEnv is NULL here because this event is posted from VM Thread 2217 jvmtiEventGarbageCollectionFinish callback = env->callbacks()->GarbageCollectionFinish; 2218 if (callback != NULL) { 2219 (*callback)(env->jvmti_external()); 2220 } 2221 } 2222 } 2223} 2224 2225void JvmtiExport::post_garbage_collection_start() { 2226 Thread* thread = Thread::current(); // this event is posted from vm-thread. 2227 EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START, 2228 ("[%s] garbage collection start event triggered", 2229 JvmtiTrace::safe_get_thread_name(thread))); 2230 JvmtiEnvIterator it; 2231 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2232 if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_START)) { 2233 EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START, 2234 ("[%s] garbage collection start event sent", 2235 JvmtiTrace::safe_get_thread_name(thread))); 2236 JvmtiThreadEventTransition jet(thread); 2237 // JNIEnv is NULL here because this event is posted from VM Thread 2238 jvmtiEventGarbageCollectionStart callback = env->callbacks()->GarbageCollectionStart; 2239 if (callback != NULL) { 2240 (*callback)(env->jvmti_external()); 2241 } 2242 } 2243 } 2244} 2245 2246void JvmtiExport::post_data_dump() { 2247 Thread *thread = Thread::current(); 2248 EVT_TRIG_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST, 2249 ("[%s] data dump request event triggered", 2250 JvmtiTrace::safe_get_thread_name(thread))); 2251 JvmtiEnvIterator it; 2252 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2253 if (env->is_enabled(JVMTI_EVENT_DATA_DUMP_REQUEST)) { 2254 EVT_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST, 2255 ("[%s] data dump request event sent", 2256 JvmtiTrace::safe_get_thread_name(thread))); 2257 JvmtiThreadEventTransition jet(thread); 2258 // JNIEnv is NULL here because this event is posted from VM Thread 2259 jvmtiEventDataDumpRequest callback = env->callbacks()->DataDumpRequest; 2260 if (callback != NULL) { 2261 (*callback)(env->jvmti_external()); 2262 } 2263 } 2264 } 2265} 2266 2267void JvmtiExport::post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) { 2268 oop object = (oop)obj_mntr->object(); 2269 if (!ServiceUtil::visible_oop(object)) { 2270 // Ignore monitor contended enter for vm internal object. 2271 return; 2272 } 2273 JvmtiThreadState *state = thread->jvmti_thread_state(); 2274 if (state == NULL) { 2275 return; 2276 } 2277 2278 HandleMark hm(thread); 2279 Handle h(thread, object); 2280 2281 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER, 2282 ("[%s] montior contended enter event triggered", 2283 JvmtiTrace::safe_get_thread_name(thread))); 2284 2285 JvmtiEnvThreadStateIterator it(state); 2286 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2287 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTER)) { 2288 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER, 2289 ("[%s] monitor contended enter event sent", 2290 JvmtiTrace::safe_get_thread_name(thread))); 2291 JvmtiMonitorEventMark jem(thread, h()); 2292 JvmtiEnv *env = ets->get_env(); 2293 JvmtiThreadEventTransition jet(thread); 2294 jvmtiEventMonitorContendedEnter callback = env->callbacks()->MonitorContendedEnter; 2295 if (callback != NULL) { 2296 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object()); 2297 } 2298 } 2299 } 2300} 2301 2302void JvmtiExport::post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) { 2303 oop object = (oop)obj_mntr->object(); 2304 if (!ServiceUtil::visible_oop(object)) { 2305 // Ignore monitor contended entered for vm internal object. 2306 return; 2307 } 2308 JvmtiThreadState *state = thread->jvmti_thread_state(); 2309 if (state == NULL) { 2310 return; 2311 } 2312 2313 HandleMark hm(thread); 2314 Handle h(thread, object); 2315 2316 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED, 2317 ("[%s] montior contended entered event triggered", 2318 JvmtiTrace::safe_get_thread_name(thread))); 2319 2320 JvmtiEnvThreadStateIterator it(state); 2321 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2322 if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED)) { 2323 EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED, 2324 ("[%s] monitor contended enter event sent", 2325 JvmtiTrace::safe_get_thread_name(thread))); 2326 JvmtiMonitorEventMark jem(thread, h()); 2327 JvmtiEnv *env = ets->get_env(); 2328 JvmtiThreadEventTransition jet(thread); 2329 jvmtiEventMonitorContendedEntered callback = env->callbacks()->MonitorContendedEntered; 2330 if (callback != NULL) { 2331 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object()); 2332 } 2333 } 2334 } 2335} 2336 2337void JvmtiExport::post_monitor_wait(JavaThread *thread, oop object, 2338 jlong timeout) { 2339 JvmtiThreadState *state = thread->jvmti_thread_state(); 2340 if (state == NULL) { 2341 return; 2342 } 2343 2344 HandleMark hm(thread); 2345 Handle h(thread, object); 2346 2347 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAIT, 2348 ("[%s] montior wait event triggered", 2349 JvmtiTrace::safe_get_thread_name(thread))); 2350 2351 JvmtiEnvThreadStateIterator it(state); 2352 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2353 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAIT)) { 2354 EVT_TRACE(JVMTI_EVENT_MONITOR_WAIT, 2355 ("[%s] monitor wait event sent", 2356 JvmtiTrace::safe_get_thread_name(thread))); 2357 JvmtiMonitorEventMark jem(thread, h()); 2358 JvmtiEnv *env = ets->get_env(); 2359 JvmtiThreadEventTransition jet(thread); 2360 jvmtiEventMonitorWait callback = env->callbacks()->MonitorWait; 2361 if (callback != NULL) { 2362 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 2363 jem.jni_object(), timeout); 2364 } 2365 } 2366 } 2367} 2368 2369void JvmtiExport::post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) { 2370 oop object = (oop)obj_mntr->object(); 2371 if (!ServiceUtil::visible_oop(object)) { 2372 // Ignore monitor waited for vm internal object. 2373 return; 2374 } 2375 JvmtiThreadState *state = thread->jvmti_thread_state(); 2376 if (state == NULL) { 2377 return; 2378 } 2379 2380 HandleMark hm(thread); 2381 Handle h(thread, object); 2382 2383 EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAITED, 2384 ("[%s] montior waited event triggered", 2385 JvmtiTrace::safe_get_thread_name(thread))); 2386 2387 JvmtiEnvThreadStateIterator it(state); 2388 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) { 2389 if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAITED)) { 2390 EVT_TRACE(JVMTI_EVENT_MONITOR_WAITED, 2391 ("[%s] monitor waited event sent", 2392 JvmtiTrace::safe_get_thread_name(thread))); 2393 JvmtiMonitorEventMark jem(thread, h()); 2394 JvmtiEnv *env = ets->get_env(); 2395 JvmtiThreadEventTransition jet(thread); 2396 jvmtiEventMonitorWaited callback = env->callbacks()->MonitorWaited; 2397 if (callback != NULL) { 2398 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 2399 jem.jni_object(), timed_out); 2400 } 2401 } 2402 } 2403} 2404 2405 2406void JvmtiExport::post_vm_object_alloc(JavaThread *thread, oop object) { 2407 EVT_TRIG_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Trg vm object alloc triggered", 2408 JvmtiTrace::safe_get_thread_name(thread))); 2409 if (object == NULL) { 2410 return; 2411 } 2412 HandleMark hm(thread); 2413 Handle h(thread, object); 2414 JvmtiEnvIterator it; 2415 for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) { 2416 if (env->is_enabled(JVMTI_EVENT_VM_OBJECT_ALLOC)) { 2417 EVT_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Evt vmobject alloc sent %s", 2418 JvmtiTrace::safe_get_thread_name(thread), 2419 object==NULL? "NULL" : object->klass()->external_name())); 2420 2421 JvmtiVMObjectAllocEventMark jem(thread, h()); 2422 JvmtiJavaThreadEventTransition jet(thread); 2423 jvmtiEventVMObjectAlloc callback = env->callbacks()->VMObjectAlloc; 2424 if (callback != NULL) { 2425 (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), 2426 jem.jni_jobject(), jem.jni_class(), jem.size()); 2427 } 2428 } 2429 } 2430} 2431 2432//////////////////////////////////////////////////////////////////////////////////////////////// 2433 2434void JvmtiExport::cleanup_thread(JavaThread* thread) { 2435 assert(JavaThread::current() == thread, "thread is not current"); 2436 MutexLocker mu(JvmtiThreadState_lock); 2437 2438 if (thread->jvmti_thread_state() != NULL) { 2439 // This has to happen after the thread state is removed, which is 2440 // why it is not in post_thread_end_event like its complement 2441 // Maybe both these functions should be rolled into the posts? 2442 JvmtiEventController::thread_ended(thread); 2443 } 2444} 2445 2446void JvmtiExport::clear_detected_exception(JavaThread* thread) { 2447 assert(JavaThread::current() == thread, "thread is not current"); 2448 2449 JvmtiThreadState* state = thread->jvmti_thread_state(); 2450 if (state != NULL) { 2451 state->clear_exception_detected(); 2452 } 2453} 2454 2455void JvmtiExport::oops_do(OopClosure* f) { 2456 JvmtiCurrentBreakpoints::oops_do(f); 2457 JvmtiVMObjectAllocEventCollector::oops_do_for_all_threads(f); 2458} 2459 2460void JvmtiExport::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f) { 2461 JvmtiTagMap::weak_oops_do(is_alive, f); 2462} 2463 2464void JvmtiExport::gc_epilogue() { 2465 JvmtiCurrentBreakpoints::gc_epilogue(); 2466} 2467 2468// Onload raw monitor transition. 2469void JvmtiExport::transition_pending_onload_raw_monitors() { 2470 JvmtiPendingMonitors::transition_raw_monitors(); 2471} 2472 2473//////////////////////////////////////////////////////////////////////////////////////////////// 2474#if INCLUDE_SERVICES 2475// Attach is disabled if SERVICES is not included 2476 2477// type for the Agent_OnAttach entry point 2478extern "C" { 2479 typedef jint (JNICALL *OnAttachEntry_t)(JavaVM*, char *, void *); 2480} 2481 2482jint JvmtiExport::load_agent_library(AttachOperation* op, outputStream* st) { 2483 // get agent name and options 2484 const char* agent = op->arg(0); 2485 const char* absParam = op->arg(1); 2486 const char* options = op->arg(2); 2487 2488 return load_agent_library(agent, absParam, options, st); 2489} 2490 2491jint JvmtiExport::load_agent_library(const char *agent, const char *absParam, 2492 const char *options, outputStream* st) { 2493 char ebuf[1024]; 2494 char buffer[JVM_MAXPATHLEN]; 2495 void* library = NULL; 2496 jint result = JNI_ERR; 2497 const char *on_attach_symbols[] = AGENT_ONATTACH_SYMBOLS; 2498 size_t num_symbol_entries = ARRAY_SIZE(on_attach_symbols); 2499 2500 // The abs paramter should be "true" or "false" 2501 bool is_absolute_path = (absParam != NULL) && (strcmp(absParam,"true")==0); 2502 2503 // Initially marked as invalid. It will be set to valid if we can find the agent 2504 AgentLibrary *agent_lib = new AgentLibrary(agent, options, is_absolute_path, NULL); 2505 2506 // Check for statically linked in agent. If not found then if the path is 2507 // absolute we attempt to load the library. Otherwise we try to load it 2508 // from the standard dll directory. 2509 2510 if (!os::find_builtin_agent(agent_lib, on_attach_symbols, num_symbol_entries)) { 2511 if (is_absolute_path) { 2512 library = os::dll_load(agent, ebuf, sizeof ebuf); 2513 } else { 2514 // Try to load the agent from the standard dll directory 2515 if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), 2516 agent)) { 2517 library = os::dll_load(buffer, ebuf, sizeof ebuf); 2518 } 2519 if (library == NULL) { 2520 // not found - try local path 2521 char ns[1] = {0}; 2522 if (os::dll_build_name(buffer, sizeof(buffer), ns, agent)) { 2523 library = os::dll_load(buffer, ebuf, sizeof ebuf); 2524 } 2525 } 2526 } 2527 if (library != NULL) { 2528 agent_lib->set_os_lib(library); 2529 agent_lib->set_valid(); 2530 } 2531 } 2532 // If the library was loaded then we attempt to invoke the Agent_OnAttach 2533 // function 2534 if (agent_lib->valid()) { 2535 // Lookup the Agent_OnAttach function 2536 OnAttachEntry_t on_attach_entry = NULL; 2537 on_attach_entry = CAST_TO_FN_PTR(OnAttachEntry_t, 2538 os::find_agent_function(agent_lib, false, on_attach_symbols, num_symbol_entries)); 2539 if (on_attach_entry == NULL) { 2540 // Agent_OnAttach missing - unload library 2541 if (!agent_lib->is_static_lib()) { 2542 os::dll_unload(library); 2543 } 2544 delete agent_lib; 2545 } else { 2546 // Invoke the Agent_OnAttach function 2547 JavaThread* THREAD = JavaThread::current(); 2548 { 2549 extern struct JavaVM_ main_vm; 2550 JvmtiThreadEventMark jem(THREAD); 2551 JvmtiJavaThreadEventTransition jet(THREAD); 2552 2553 result = (*on_attach_entry)(&main_vm, (char*)options, NULL); 2554 } 2555 2556 // Agent_OnAttach may have used JNI 2557 if (HAS_PENDING_EXCEPTION) { 2558 CLEAR_PENDING_EXCEPTION; 2559 } 2560 2561 // If OnAttach returns JNI_OK then we add it to the list of 2562 // agent libraries so that we can call Agent_OnUnload later. 2563 if (result == JNI_OK) { 2564 Arguments::add_loaded_agent(agent_lib); 2565 } else { 2566 delete agent_lib; 2567 } 2568 2569 // Agent_OnAttach executed so completion status is JNI_OK 2570 st->print_cr("%d", result); 2571 result = JNI_OK; 2572 } 2573 } 2574 return result; 2575} 2576 2577#endif // INCLUDE_SERVICES 2578//////////////////////////////////////////////////////////////////////////////////////////////// 2579 2580// Setup current current thread for event collection. 2581void JvmtiEventCollector::setup_jvmti_thread_state() { 2582 // set this event collector to be the current one. 2583 JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current()); 2584 // state can only be NULL if the current thread is exiting which 2585 // should not happen since we're trying to configure for event collection 2586 guarantee(state != NULL, "exiting thread called setup_jvmti_thread_state"); 2587 if (is_vm_object_alloc_event()) { 2588 _prev = state->get_vm_object_alloc_event_collector(); 2589 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)this); 2590 } else if (is_dynamic_code_event()) { 2591 _prev = state->get_dynamic_code_event_collector(); 2592 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)this); 2593 } 2594} 2595 2596// Unset current event collection in this thread and reset it with previous 2597// collector. 2598void JvmtiEventCollector::unset_jvmti_thread_state() { 2599 JvmtiThreadState* state = JavaThread::current()->jvmti_thread_state(); 2600 if (state != NULL) { 2601 // restore the previous event collector (if any) 2602 if (is_vm_object_alloc_event()) { 2603 if (state->get_vm_object_alloc_event_collector() == this) { 2604 state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)_prev); 2605 } else { 2606 // this thread's jvmti state was created during the scope of 2607 // the event collector. 2608 } 2609 } else { 2610 if (is_dynamic_code_event()) { 2611 if (state->get_dynamic_code_event_collector() == this) { 2612 state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)_prev); 2613 } else { 2614 // this thread's jvmti state was created during the scope of 2615 // the event collector. 2616 } 2617 } 2618 } 2619 } 2620} 2621 2622// create the dynamic code event collector 2623JvmtiDynamicCodeEventCollector::JvmtiDynamicCodeEventCollector() : _code_blobs(NULL) { 2624 if (JvmtiExport::should_post_dynamic_code_generated()) { 2625 setup_jvmti_thread_state(); 2626 } 2627} 2628 2629// iterate over any code blob descriptors collected and post a 2630// DYNAMIC_CODE_GENERATED event to the profiler. 2631JvmtiDynamicCodeEventCollector::~JvmtiDynamicCodeEventCollector() { 2632 assert(!JavaThread::current()->owns_locks(), "all locks must be released to post deferred events"); 2633 // iterate over any code blob descriptors that we collected 2634 if (_code_blobs != NULL) { 2635 for (int i=0; i<_code_blobs->length(); i++) { 2636 JvmtiCodeBlobDesc* blob = _code_blobs->at(i); 2637 JvmtiExport::post_dynamic_code_generated(blob->name(), blob->code_begin(), blob->code_end()); 2638 FreeHeap(blob); 2639 } 2640 delete _code_blobs; 2641 } 2642 unset_jvmti_thread_state(); 2643} 2644 2645// register a stub 2646void JvmtiDynamicCodeEventCollector::register_stub(const char* name, address start, address end) { 2647 if (_code_blobs == NULL) { 2648 _code_blobs = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JvmtiCodeBlobDesc*>(1,true); 2649 } 2650 _code_blobs->append(new JvmtiCodeBlobDesc(name, start, end)); 2651} 2652 2653// Setup current thread to record vm allocated objects. 2654JvmtiVMObjectAllocEventCollector::JvmtiVMObjectAllocEventCollector() : _allocated(NULL) { 2655 if (JvmtiExport::should_post_vm_object_alloc()) { 2656 _enable = true; 2657 setup_jvmti_thread_state(); 2658 } else { 2659 _enable = false; 2660 } 2661} 2662 2663// Post vm_object_alloc event for vm allocated objects visible to java 2664// world. 2665JvmtiVMObjectAllocEventCollector::~JvmtiVMObjectAllocEventCollector() { 2666 if (_allocated != NULL) { 2667 set_enabled(false); 2668 for (int i = 0; i < _allocated->length(); i++) { 2669 oop obj = _allocated->at(i); 2670 if (ServiceUtil::visible_oop(obj)) { 2671 JvmtiExport::post_vm_object_alloc(JavaThread::current(), obj); 2672 } 2673 } 2674 delete _allocated; 2675 } 2676 unset_jvmti_thread_state(); 2677} 2678 2679void JvmtiVMObjectAllocEventCollector::record_allocation(oop obj) { 2680 assert(is_enabled(), "VM object alloc event collector is not enabled"); 2681 if (_allocated == NULL) { 2682 _allocated = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(1, true); 2683 } 2684 _allocated->push(obj); 2685} 2686 2687// GC support. 2688void JvmtiVMObjectAllocEventCollector::oops_do(OopClosure* f) { 2689 if (_allocated != NULL) { 2690 for(int i=_allocated->length() - 1; i >= 0; i--) { 2691 if (_allocated->at(i) != NULL) { 2692 f->do_oop(_allocated->adr_at(i)); 2693 } 2694 } 2695 } 2696} 2697 2698void JvmtiVMObjectAllocEventCollector::oops_do_for_all_threads(OopClosure* f) { 2699 // no-op if jvmti not enabled 2700 if (!JvmtiEnv::environments_might_exist()) { 2701 return; 2702 } 2703 2704 // Runs at safepoint. So no need to acquire Threads_lock. 2705 for (JavaThread *jthr = Threads::first(); jthr != NULL; jthr = jthr->next()) { 2706 JvmtiThreadState *state = jthr->jvmti_thread_state(); 2707 if (state != NULL) { 2708 JvmtiVMObjectAllocEventCollector *collector; 2709 collector = state->get_vm_object_alloc_event_collector(); 2710 while (collector != NULL) { 2711 collector->oops_do(f); 2712 collector = (JvmtiVMObjectAllocEventCollector *)collector->get_prev(); 2713 } 2714 } 2715 } 2716} 2717 2718 2719// Disable collection of VMObjectAlloc events 2720NoJvmtiVMObjectAllocMark::NoJvmtiVMObjectAllocMark() : _collector(NULL) { 2721 // a no-op if VMObjectAlloc event is not enabled 2722 if (!JvmtiExport::should_post_vm_object_alloc()) { 2723 return; 2724 } 2725 Thread* thread = Thread::current_or_null(); 2726 if (thread != NULL && thread->is_Java_thread()) { 2727 JavaThread* current_thread = (JavaThread*)thread; 2728 JvmtiThreadState *state = current_thread->jvmti_thread_state(); 2729 if (state != NULL) { 2730 JvmtiVMObjectAllocEventCollector *collector; 2731 collector = state->get_vm_object_alloc_event_collector(); 2732 if (collector != NULL && collector->is_enabled()) { 2733 _collector = collector; 2734 _collector->set_enabled(false); 2735 } 2736 } 2737 } 2738} 2739 2740// Re-Enable collection of VMObjectAlloc events (if previously enabled) 2741NoJvmtiVMObjectAllocMark::~NoJvmtiVMObjectAllocMark() { 2742 if (was_enabled()) { 2743 _collector->set_enabled(true); 2744 } 2745}; 2746 2747JvmtiGCMarker::JvmtiGCMarker() { 2748 // if there aren't any JVMTI environments then nothing to do 2749 if (!JvmtiEnv::environments_might_exist()) { 2750 return; 2751 } 2752 2753 if (JvmtiExport::should_post_garbage_collection_start()) { 2754 JvmtiExport::post_garbage_collection_start(); 2755 } 2756 2757 if (SafepointSynchronize::is_at_safepoint()) { 2758 // Do clean up tasks that need to be done at a safepoint 2759 JvmtiEnvBase::check_for_periodic_clean_up(); 2760 } 2761} 2762 2763JvmtiGCMarker::~JvmtiGCMarker() { 2764 // if there aren't any JVMTI environments then nothing to do 2765 if (!JvmtiEnv::environments_might_exist()) { 2766 return; 2767 } 2768 2769 // JVMTI notify gc finish 2770 if (JvmtiExport::should_post_garbage_collection_finish()) { 2771 JvmtiExport::post_garbage_collection_finish(); 2772 } 2773} 2774