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