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