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