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