1 /*
   2  * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/systemDictionary.hpp"
  27 #include "code/nmethod.hpp"
  28 #include "code/pcDesc.hpp"
  29 #include "code/scopeDesc.hpp"
  30 #include "interpreter/interpreter.hpp"
  31 #include "jvmtifiles/jvmtiEnv.hpp"
  32 #include "logging/log.hpp"
  33 #include "logging/logStream.hpp"
  34 #include "memory/allocation.inline.hpp"
  35 #include "memory/resourceArea.hpp"
  36 #include "oops/objArrayKlass.hpp"
  37 #include "oops/objArrayOop.hpp"
  38 #include "oops/oop.inline.hpp"
  39 #include "prims/jvmtiCodeBlobEvents.hpp"
  40 #include "prims/jvmtiEventController.hpp"
  41 #include "prims/jvmtiEventController.inline.hpp"
  42 #include "prims/jvmtiExport.hpp"
  43 #include "prims/jvmtiImpl.hpp"
  44 #include "prims/jvmtiManageCapabilities.hpp"
  45 #include "prims/jvmtiRawMonitor.hpp"
  46 #include "prims/jvmtiRedefineClasses.hpp"
  47 #include "prims/jvmtiTagMap.hpp"
  48 #include "prims/jvmtiThreadState.inline.hpp"
  49 #include "runtime/arguments.hpp"
  50 #include "runtime/handles.hpp"
  51 #include "runtime/interfaceSupport.inline.hpp"
  52 #include "runtime/javaCalls.hpp"
  53 #include "runtime/jniHandles.inline.hpp"
  54 #include "runtime/objectMonitor.hpp"
  55 #include "runtime/objectMonitor.inline.hpp"
  56 #include "runtime/os.inline.hpp"
  57 #include "runtime/thread.inline.hpp"
  58 #include "runtime/threadSMR.hpp"
  59 #include "runtime/vframe.hpp"
  60 #include "utilities/macros.hpp"
  61 #if INCLUDE_ALL_GCS
  62 #include "gc/parallel/psMarkSweep.hpp"
  63 #endif // INCLUDE_ALL_GCS
  64 
  65 #ifdef JVMTI_TRACE
  66 #define EVT_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_SENT) != 0) { SafeResourceMark rm; log_trace(jvmti) out; }
  67 #define EVT_TRIG_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_TRIGGER) != 0) { SafeResourceMark rm; log_trace(jvmti) out; }
  68 #else
  69 #define EVT_TRIG_TRACE(evt,out)
  70 #define EVT_TRACE(evt,out)
  71 #endif
  72 
  73 ///////////////////////////////////////////////////////////////
  74 //
  75 // JvmtiEventTransition
  76 //
  77 // TO DO --
  78 //  more handle purging
  79 
  80 // Use this for JavaThreads and state is  _thread_in_vm.
  81 class JvmtiJavaThreadEventTransition : StackObj {
  82 private:
  83   ResourceMark _rm;
  84   ThreadToNativeFromVM _transition;
  85   HandleMark _hm;
  86 
  87 public:
  88   JvmtiJavaThreadEventTransition(JavaThread *thread) :
  89     _rm(),
  90     _transition(thread),
  91     _hm(thread)  {};
  92 };
  93 
  94 // For JavaThreads which are not in _thread_in_vm state
  95 // and other system threads use this.
  96 class JvmtiThreadEventTransition : StackObj {
  97 private:
  98   ResourceMark _rm;
  99   HandleMark _hm;
 100   JavaThreadState _saved_state;
 101   JavaThread *_jthread;
 102 
 103 public:
 104   JvmtiThreadEventTransition(Thread *thread) : _rm(), _hm() {
 105     if (thread->is_Java_thread()) {
 106        _jthread = (JavaThread *)thread;
 107        _saved_state = _jthread->thread_state();
 108        if (_saved_state == _thread_in_Java) {
 109          ThreadStateTransition::transition_from_java(_jthread, _thread_in_native);
 110        } else {
 111          ThreadStateTransition::transition(_jthread, _saved_state, _thread_in_native);
 112        }
 113     } else {
 114       _jthread = NULL;
 115     }
 116   }
 117 
 118   ~JvmtiThreadEventTransition() {
 119     if (_jthread != NULL)
 120       ThreadStateTransition::transition_from_native(_jthread, _saved_state);
 121   }
 122 };
 123 
 124 
 125 ///////////////////////////////////////////////////////////////
 126 //
 127 // JvmtiEventMark
 128 //
 129 
 130 class JvmtiEventMark : public StackObj {
 131 private:
 132   JavaThread *_thread;
 133   JNIEnv* _jni_env;
 134   JvmtiThreadState::ExceptionState _saved_exception_state;
 135 #if 0
 136   JNIHandleBlock* _hblock;
 137 #endif
 138 
 139 public:
 140   JvmtiEventMark(JavaThread *thread) :  _thread(thread),
 141                                         _jni_env(thread->jni_environment()),
 142                                         _saved_exception_state(JvmtiThreadState::ES_CLEARED) {
 143 #if 0
 144     _hblock = thread->active_handles();
 145     _hblock->clear_thoroughly(); // so we can be safe
 146 #else
 147     // we want to use the code above - but that needs the JNIHandle changes - later...
 148     // for now, steal JNI push local frame code
 149     JvmtiThreadState *state = thread->jvmti_thread_state();
 150     // we are before an event.
 151     // Save current jvmti thread exception state.
 152     if (state != NULL) {
 153       _saved_exception_state = state->get_exception_state();
 154     }
 155 
 156     JNIHandleBlock* old_handles = thread->active_handles();
 157     JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
 158     assert(new_handles != NULL, "should not be NULL");
 159     new_handles->set_pop_frame_link(old_handles);
 160     thread->set_active_handles(new_handles);
 161 #endif
 162     assert(thread == JavaThread::current(), "thread must be current!");
 163     thread->frame_anchor()->make_walkable(thread);
 164   };
 165 
 166   ~JvmtiEventMark() {
 167 #if 0
 168     _hblock->clear(); // for consistency with future correct behavior
 169 #else
 170     // we want to use the code above - but that needs the JNIHandle changes - later...
 171     // for now, steal JNI pop local frame code
 172     JNIHandleBlock* old_handles = _thread->active_handles();
 173     JNIHandleBlock* new_handles = old_handles->pop_frame_link();
 174     assert(new_handles != NULL, "should not be NULL");
 175     _thread->set_active_handles(new_handles);
 176     // Note that we set the pop_frame_link to NULL explicitly, otherwise
 177     // the release_block call will release the blocks.
 178     old_handles->set_pop_frame_link(NULL);
 179     JNIHandleBlock::release_block(old_handles, _thread); // may block
 180 #endif
 181 
 182     JvmtiThreadState* state = _thread->jvmti_thread_state();
 183     // we are continuing after an event.
 184     if (state != NULL) {
 185       // Restore the jvmti thread exception state.
 186       state->restore_exception_state(_saved_exception_state);
 187     }
 188   }
 189 
 190 #if 0
 191   jobject to_jobject(oop obj) { return obj == NULL? NULL : _hblock->allocate_handle_fast(obj); }
 192 #else
 193   // we want to use the code above - but that needs the JNIHandle changes - later...
 194   // for now, use regular make_local
 195   jobject to_jobject(oop obj) { return JNIHandles::make_local(_thread,obj); }
 196 #endif
 197 
 198   jclass to_jclass(Klass* klass) { return (klass == NULL ? NULL : (jclass)to_jobject(klass->java_mirror())); }
 199 
 200   jmethodID to_jmethodID(const methodHandle& method) { return method->jmethod_id(); }
 201 
 202   JNIEnv* jni_env() { return _jni_env; }
 203 };
 204 
 205 class JvmtiThreadEventMark : public JvmtiEventMark {
 206 private:
 207   jthread _jt;
 208 
 209 public:
 210   JvmtiThreadEventMark(JavaThread *thread) :
 211     JvmtiEventMark(thread) {
 212     _jt = (jthread)(to_jobject(thread->threadObj()));
 213   };
 214  jthread jni_thread() { return _jt; }
 215 };
 216 
 217 class JvmtiClassEventMark : public JvmtiThreadEventMark {
 218 private:
 219   jclass _jc;
 220 
 221 public:
 222   JvmtiClassEventMark(JavaThread *thread, Klass* klass) :
 223     JvmtiThreadEventMark(thread) {
 224     _jc = to_jclass(klass);
 225   };
 226   jclass jni_class() { return _jc; }
 227 };
 228 
 229 class JvmtiMethodEventMark : public JvmtiThreadEventMark {
 230 private:
 231   jmethodID _mid;
 232 
 233 public:
 234   JvmtiMethodEventMark(JavaThread *thread, const methodHandle& method) :
 235     JvmtiThreadEventMark(thread),
 236     _mid(to_jmethodID(method)) {};
 237   jmethodID jni_methodID() { return _mid; }
 238 };
 239 
 240 class JvmtiLocationEventMark : public JvmtiMethodEventMark {
 241 private:
 242   jlocation _loc;
 243 
 244 public:
 245   JvmtiLocationEventMark(JavaThread *thread, const methodHandle& method, address location) :
 246     JvmtiMethodEventMark(thread, method),
 247     _loc(location - method->code_base()) {};
 248   jlocation location() { return _loc; }
 249 };
 250 
 251 class JvmtiExceptionEventMark : public JvmtiLocationEventMark {
 252 private:
 253   jobject _exc;
 254 
 255 public:
 256   JvmtiExceptionEventMark(JavaThread *thread, const methodHandle& method, address location, Handle exception) :
 257     JvmtiLocationEventMark(thread, method, location),
 258     _exc(to_jobject(exception())) {};
 259   jobject exception() { return _exc; }
 260 };
 261 
 262 class JvmtiClassFileLoadEventMark : public JvmtiThreadEventMark {
 263 private:
 264   const char *_class_name;
 265   jobject _jloader;
 266   jobject _protection_domain;
 267   jclass  _class_being_redefined;
 268 
 269 public:
 270   JvmtiClassFileLoadEventMark(JavaThread *thread, Symbol* name,
 271      Handle class_loader, Handle prot_domain, Klass* class_being_redefined) : JvmtiThreadEventMark(thread) {
 272       _class_name = name != NULL? name->as_utf8() : NULL;
 273       _jloader = (jobject)to_jobject(class_loader());
 274       _protection_domain = (jobject)to_jobject(prot_domain());
 275       if (class_being_redefined == NULL) {
 276         _class_being_redefined = NULL;
 277       } else {
 278         _class_being_redefined = (jclass)to_jclass(class_being_redefined);
 279       }
 280   };
 281   const char *class_name() {
 282     return _class_name;
 283   }
 284   jobject jloader() {
 285     return _jloader;
 286   }
 287   jobject protection_domain() {
 288     return _protection_domain;
 289   }
 290   jclass class_being_redefined() {
 291     return _class_being_redefined;
 292   }
 293 };
 294 
 295 //////////////////////////////////////////////////////////////////////////////
 296 
 297 int               JvmtiExport::_field_access_count                        = 0;
 298 int               JvmtiExport::_field_modification_count                  = 0;
 299 
 300 bool              JvmtiExport::_can_access_local_variables                = false;
 301 bool              JvmtiExport::_can_hotswap_or_post_breakpoint            = false;
 302 bool              JvmtiExport::_can_modify_any_class                      = false;
 303 bool              JvmtiExport::_can_walk_any_space                        = false;
 304 
 305 bool              JvmtiExport::_has_redefined_a_class                     = false;
 306 bool              JvmtiExport::_all_dependencies_are_recorded             = false;
 307 
 308 //
 309 // field access management
 310 //
 311 
 312 // interpreter generator needs the address of the counter
 313 address JvmtiExport::get_field_access_count_addr() {
 314   // We don't grab a lock because we don't want to
 315   // serialize field access between all threads. This means that a
 316   // thread on another processor can see the wrong count value and
 317   // may either miss making a needed call into post_field_access()
 318   // or will make an unneeded call into post_field_access(). We pay
 319   // this price to avoid slowing down the VM when we aren't watching
 320   // field accesses.
 321   // Other access/mutation safe by virtue of being in VM state.
 322   return (address)(&_field_access_count);
 323 }
 324 
 325 //
 326 // field modification management
 327 //
 328 
 329 // interpreter generator needs the address of the counter
 330 address JvmtiExport::get_field_modification_count_addr() {
 331   // We don't grab a lock because we don't
 332   // want to serialize field modification between all threads. This
 333   // means that a thread on another processor can see the wrong
 334   // count value and may either miss making a needed call into
 335   // post_field_modification() or will make an unneeded call into
 336   // post_field_modification(). We pay this price to avoid slowing
 337   // down the VM when we aren't watching field modifications.
 338   // Other access/mutation safe by virtue of being in VM state.
 339   return (address)(&_field_modification_count);
 340 }
 341 
 342 
 343 ///////////////////////////////////////////////////////////////
 344 // Functions needed by java.lang.instrument for starting up javaagent.
 345 ///////////////////////////////////////////////////////////////
 346 
 347 jint
 348 JvmtiExport::get_jvmti_interface(JavaVM *jvm, void **penv, jint version) {
 349   // The JVMTI_VERSION_INTERFACE_JVMTI part of the version number
 350   // has already been validated in JNI GetEnv().
 351   int major, minor, micro;
 352 
 353   // micro version doesn't matter here (yet?)
 354   decode_version_values(version, &major, &minor, &micro);
 355   switch (major) {
 356     case 1:
 357       switch (minor) {
 358         case 0:  // version 1.0.<micro> is recognized
 359         case 1:  // version 1.1.<micro> is recognized
 360         case 2:  // version 1.2.<micro> is recognized
 361           break;
 362 
 363         default:
 364           return JNI_EVERSION;  // unsupported minor version number
 365       }
 366       break;
 367     case 9:
 368       switch (minor) {
 369         case 0:  // version 9.0.<micro> is recognized
 370           break;
 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::current();
 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     LogTarget(Trace, jvmti) log;
 421     LogStream log_stream(log);
 422     java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
 423     log_stream.cr();
 424     CLEAR_PENDING_EXCEPTION;
 425     return;
 426   }
 427 }
 428 
 429 jvmtiError
 430 JvmtiExport::add_module_reads(Handle module, Handle to_module, TRAPS) {
 431   if (!Universe::is_module_initialized()) {
 432     return JVMTI_ERROR_NONE; // extra safety
 433   }
 434   assert(!module.is_null(), "module should always be set");
 435   assert(!to_module.is_null(), "to_module should always be set");
 436 
 437   // Invoke the addReads method
 438   JavaValue result(T_VOID);
 439   JavaCalls::call_static(&result,
 440                          SystemDictionary::module_Modules_klass(),
 441                          vmSymbols::addReads_name(),
 442                          vmSymbols::addReads_signature(),
 443                          module,
 444                          to_module,
 445                          THREAD);
 446 
 447   if (HAS_PENDING_EXCEPTION) {
 448     LogTarget(Trace, jvmti) log;
 449     LogStream log_stream(log);
 450     java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
 451     log_stream.cr();
 452     CLEAR_PENDING_EXCEPTION;
 453     return JVMTI_ERROR_INTERNAL;
 454   }
 455   return JVMTI_ERROR_NONE;
 456 }
 457 
 458 jvmtiError
 459 JvmtiExport::add_module_exports(Handle module, Handle pkg_name, Handle to_module, TRAPS) {
 460   if (!Universe::is_module_initialized()) {
 461     return JVMTI_ERROR_NONE; // extra safety
 462   }
 463   assert(!module.is_null(), "module should always be set");
 464   assert(!to_module.is_null(), "to_module should always be set");
 465   assert(!pkg_name.is_null(), "pkg_name should always be set");
 466 
 467   // Invoke the addExports method
 468   JavaValue result(T_VOID);
 469   JavaCalls::call_static(&result,
 470                          SystemDictionary::module_Modules_klass(),
 471                          vmSymbols::addExports_name(),
 472                          vmSymbols::addExports_signature(),
 473                          module,
 474                          pkg_name,
 475                          to_module,
 476                          THREAD);
 477 
 478   if (HAS_PENDING_EXCEPTION) {
 479     Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
 480     LogTarget(Trace, jvmti) log;
 481     LogStream log_stream(log);
 482     java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
 483     log_stream.cr();
 484     CLEAR_PENDING_EXCEPTION;
 485     if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) {
 486       return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 487     }
 488     return JVMTI_ERROR_INTERNAL;
 489   }
 490   return JVMTI_ERROR_NONE;
 491 }
 492 
 493 jvmtiError
 494 JvmtiExport::add_module_opens(Handle module, Handle pkg_name, Handle to_module, TRAPS) {
 495   if (!Universe::is_module_initialized()) {
 496     return JVMTI_ERROR_NONE; // extra safety
 497   }
 498   assert(!module.is_null(), "module should always be set");
 499   assert(!to_module.is_null(), "to_module should always be set");
 500   assert(!pkg_name.is_null(), "pkg_name should always be set");
 501 
 502   // Invoke the addOpens method
 503   JavaValue result(T_VOID);
 504   JavaCalls::call_static(&result,
 505                          SystemDictionary::module_Modules_klass(),
 506                          vmSymbols::addOpens_name(),
 507                          vmSymbols::addExports_signature(),
 508                          module,
 509                          pkg_name,
 510                          to_module,
 511                          THREAD);
 512 
 513   if (HAS_PENDING_EXCEPTION) {
 514     Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
 515     LogTarget(Trace, jvmti) log;
 516     LogStream log_stream(log);
 517     java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
 518     log_stream.cr();
 519     CLEAR_PENDING_EXCEPTION;
 520     if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) {
 521       return JVMTI_ERROR_ILLEGAL_ARGUMENT;
 522     }
 523     return JVMTI_ERROR_INTERNAL;
 524   }
 525   return JVMTI_ERROR_NONE;
 526 }
 527 
 528 jvmtiError
 529 JvmtiExport::add_module_uses(Handle module, Handle service, TRAPS) {
 530   if (!Universe::is_module_initialized()) {
 531     return JVMTI_ERROR_NONE; // extra safety
 532   }
 533   assert(!module.is_null(), "module should always be set");
 534   assert(!service.is_null(), "service should always be set");
 535 
 536   // Invoke the addUses method
 537   JavaValue result(T_VOID);
 538   JavaCalls::call_static(&result,
 539                          SystemDictionary::module_Modules_klass(),
 540                          vmSymbols::addUses_name(),
 541                          vmSymbols::addUses_signature(),
 542                          module,
 543                          service,
 544                          THREAD);
 545 
 546   if (HAS_PENDING_EXCEPTION) {
 547     LogTarget(Trace, jvmti) log;
 548     LogStream log_stream(log);
 549     java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
 550     log_stream.cr();
 551     CLEAR_PENDING_EXCEPTION;
 552     return JVMTI_ERROR_INTERNAL;
 553   }
 554   return JVMTI_ERROR_NONE;
 555 }
 556 
 557 jvmtiError
 558 JvmtiExport::add_module_provides(Handle module, Handle service, Handle impl_class, TRAPS) {
 559   if (!Universe::is_module_initialized()) {
 560     return JVMTI_ERROR_NONE; // extra safety
 561   }
 562   assert(!module.is_null(), "module should always be set");
 563   assert(!service.is_null(), "service should always be set");
 564   assert(!impl_class.is_null(), "impl_class should always be set");
 565 
 566   // Invoke the addProvides method
 567   JavaValue result(T_VOID);
 568   JavaCalls::call_static(&result,
 569                          SystemDictionary::module_Modules_klass(),
 570                          vmSymbols::addProvides_name(),
 571                          vmSymbols::addProvides_signature(),
 572                          module,
 573                          service,
 574                          impl_class,
 575                          THREAD);
 576 
 577   if (HAS_PENDING_EXCEPTION) {
 578     LogTarget(Trace, jvmti) log;
 579     LogStream log_stream(log);
 580     java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
 581     log_stream.cr();
 582     CLEAR_PENDING_EXCEPTION;
 583     return JVMTI_ERROR_INTERNAL;
 584   }
 585   return JVMTI_ERROR_NONE;
 586 }
 587 
 588 void
 589 JvmtiExport::decode_version_values(jint version, int * major, int * minor,
 590                                    int * micro) {
 591   *major = (version & JVMTI_VERSION_MASK_MAJOR) >> JVMTI_VERSION_SHIFT_MAJOR;
 592   *minor = (version & JVMTI_VERSION_MASK_MINOR) >> JVMTI_VERSION_SHIFT_MINOR;
 593   *micro = (version & JVMTI_VERSION_MASK_MICRO) >> JVMTI_VERSION_SHIFT_MICRO;
 594 }
 595 
 596 void JvmtiExport::enter_primordial_phase() {
 597   JvmtiEnvBase::set_phase(JVMTI_PHASE_PRIMORDIAL);
 598 }
 599 
 600 void JvmtiExport::enter_early_start_phase() {
 601   set_early_vmstart_recorded(true);
 602 }
 603 
 604 void JvmtiExport::enter_start_phase() {
 605   JvmtiEnvBase::set_phase(JVMTI_PHASE_START);
 606 }
 607 
 608 void JvmtiExport::enter_onload_phase() {
 609   JvmtiEnvBase::set_phase(JVMTI_PHASE_ONLOAD);
 610 }
 611 
 612 void JvmtiExport::enter_live_phase() {
 613   JvmtiEnvBase::set_phase(JVMTI_PHASE_LIVE);
 614 }
 615 
 616 //
 617 // JVMTI events that the VM posts to the debugger and also startup agent
 618 // and call the agent's premain() for java.lang.instrument.
 619 //
 620 
 621 void JvmtiExport::post_early_vm_start() {
 622   EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg Early VM start event triggered" ));
 623 
 624   // can now enable some events
 625   JvmtiEventController::vm_start();
 626 
 627   JvmtiEnvIterator it;
 628   for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
 629     // Only early vmstart envs post early VMStart event
 630     if (env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) {
 631       EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt Early VM start event sent" ));
 632       JavaThread *thread  = JavaThread::current();
 633       JvmtiThreadEventMark jem(thread);
 634       JvmtiJavaThreadEventTransition jet(thread);
 635       jvmtiEventVMStart callback = env->callbacks()->VMStart;
 636       if (callback != NULL) {
 637         (*callback)(env->jvmti_external(), jem.jni_env());
 638       }
 639     }
 640   }
 641 }
 642 
 643 void JvmtiExport::post_vm_start() {
 644   EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg VM start event triggered" ));
 645 
 646   // can now enable some events
 647   JvmtiEventController::vm_start();
 648 
 649   JvmtiEnvIterator it;
 650   for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
 651     // Early vmstart envs do not post normal VMStart event
 652     if (!env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) {
 653       EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt VM start event sent" ));
 654 
 655       JavaThread *thread  = JavaThread::current();
 656       JvmtiThreadEventMark jem(thread);
 657       JvmtiJavaThreadEventTransition jet(thread);
 658       jvmtiEventVMStart callback = env->callbacks()->VMStart;
 659       if (callback != NULL) {
 660         (*callback)(env->jvmti_external(), jem.jni_env());
 661       }
 662     }
 663   }
 664 }
 665 
 666 
 667 void JvmtiExport::post_vm_initialized() {
 668   EVT_TRIG_TRACE(JVMTI_EVENT_VM_INIT, ("Trg VM init event triggered" ));
 669 
 670   // can now enable events
 671   JvmtiEventController::vm_init();
 672 
 673   JvmtiEnvIterator it;
 674   for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
 675     if (env->is_enabled(JVMTI_EVENT_VM_INIT)) {
 676       EVT_TRACE(JVMTI_EVENT_VM_INIT, ("Evt VM init event sent" ));
 677 
 678       JavaThread *thread  = JavaThread::current();
 679       JvmtiThreadEventMark jem(thread);
 680       JvmtiJavaThreadEventTransition jet(thread);
 681       jvmtiEventVMInit callback = env->callbacks()->VMInit;
 682       if (callback != NULL) {
 683         (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
 684       }
 685     }
 686   }
 687 }
 688 
 689 
 690 void JvmtiExport::post_vm_death() {
 691   EVT_TRIG_TRACE(JVMTI_EVENT_VM_DEATH, ("Trg VM death event triggered" ));
 692 
 693   JvmtiEnvIterator it;
 694   for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
 695     if (env->is_enabled(JVMTI_EVENT_VM_DEATH)) {
 696       EVT_TRACE(JVMTI_EVENT_VM_DEATH, ("Evt VM death event sent" ));
 697 
 698       JavaThread *thread  = JavaThread::current();
 699       JvmtiEventMark jem(thread);
 700       JvmtiJavaThreadEventTransition jet(thread);
 701       jvmtiEventVMDeath callback = env->callbacks()->VMDeath;
 702       if (callback != NULL) {
 703         (*callback)(env->jvmti_external(), jem.jni_env());
 704       }
 705     }
 706   }
 707 
 708   JvmtiEnvBase::set_phase(JVMTI_PHASE_DEAD);
 709   JvmtiEventController::vm_death();
 710 }
 711 
 712 char**
 713 JvmtiExport::get_all_native_method_prefixes(int* count_ptr) {
 714   // Have to grab JVMTI thread state lock to be sure environment doesn't
 715   // go away while we iterate them.  No locks during VM bring-up.
 716   if (Threads::number_of_threads() == 0 || SafepointSynchronize::is_at_safepoint()) {
 717     return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
 718   } else {
 719     MutexLocker mu(JvmtiThreadState_lock);
 720     return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
 721   }
 722 }
 723 
 724 // Convert an external thread reference to a JavaThread found on the
 725 // specified ThreadsList. The ThreadsListHandle in the caller "protects"
 726 // the returned JavaThread *.
 727 //
 728 // If thread_oop_p is not NULL, then the caller wants to use the oop
 729 // after this call so the oop is returned. On success, *jt_pp is set
 730 // to the converted JavaThread * and JVMTI_ERROR_NONE is returned.
 731 // On error, returns various JVMTI_ERROR_* values.
 732 //
 733 jvmtiError
 734 JvmtiExport::cv_external_thread_to_JavaThread(ThreadsList * t_list,
 735                                               jthread thread,
 736                                               JavaThread ** jt_pp,
 737                                               oop * thread_oop_p) {
 738   assert(t_list != NULL, "must have a ThreadsList");
 739   assert(jt_pp != NULL, "must have a return JavaThread pointer");
 740   // thread_oop_p is optional so no assert()
 741 
 742   oop thread_oop = JNIHandles::resolve_external_guard(thread);
 743   if (thread_oop == NULL) {
 744     // NULL jthread, GC'ed jthread or a bad JNI handle.
 745     return JVMTI_ERROR_INVALID_THREAD;
 746   }
 747   // Looks like an oop at this point.
 748 
 749   if (!thread_oop->is_a(SystemDictionary::Thread_klass())) {
 750     // The oop is not a java.lang.Thread.
 751     return JVMTI_ERROR_INVALID_THREAD;
 752   }
 753   // Looks like a java.lang.Thread oop at this point.
 754 
 755   if (thread_oop_p != NULL) {
 756     // Return the oop to the caller; the caller may still want
 757     // the oop even if this function returns an error.
 758     *thread_oop_p = thread_oop;
 759   }
 760 
 761   JavaThread * java_thread = java_lang_Thread::thread(thread_oop);
 762   if (java_thread == NULL) {
 763     // The java.lang.Thread does not contain a JavaThread * so it has
 764     // not yet run or it has died.
 765     return JVMTI_ERROR_THREAD_NOT_ALIVE;
 766   }
 767   // Looks like a live JavaThread at this point.
 768 
 769   // We do not check the EnableThreadSMRExtraValidityChecks option
 770   // for this includes() call because JVM/TI's spec is tighter.
 771   if (!t_list->includes(java_thread)) {
 772     // Not on the JavaThreads list so it is not alive.
 773     return JVMTI_ERROR_THREAD_NOT_ALIVE;
 774   }
 775 
 776   // Return a live JavaThread that is "protected" by the
 777   // ThreadsListHandle in the caller.
 778   *jt_pp = java_thread;
 779 
 780   return JVMTI_ERROR_NONE;
 781 }
 782 
 783 // Convert an oop to a JavaThread found on the specified ThreadsList.
 784 // The ThreadsListHandle in the caller "protects" the returned
 785 // JavaThread *.
 786 //
 787 // On success, *jt_pp is set to the converted JavaThread * and
 788 // JVMTI_ERROR_NONE is returned. On error, returns various
 789 // JVMTI_ERROR_* values.
 790 //
 791 jvmtiError
 792 JvmtiExport::cv_oop_to_JavaThread(ThreadsList * t_list, oop thread_oop,
 793                                   JavaThread ** jt_pp) {
 794   assert(t_list != NULL, "must have a ThreadsList");
 795   assert(thread_oop != NULL, "must have an oop");
 796   assert(jt_pp != NULL, "must have a return JavaThread pointer");
 797 
 798   if (!thread_oop->is_a(SystemDictionary::Thread_klass())) {
 799     // The oop is not a java.lang.Thread.
 800     return JVMTI_ERROR_INVALID_THREAD;
 801   }
 802   // Looks like a java.lang.Thread oop at this point.
 803 
 804   JavaThread * java_thread = java_lang_Thread::thread(thread_oop);
 805   if (java_thread == NULL) {
 806     // The java.lang.Thread does not contain a JavaThread * so it has
 807     // not yet run or it has died.
 808     return JVMTI_ERROR_THREAD_NOT_ALIVE;
 809   }
 810   // Looks like a live JavaThread at this point.
 811 
 812   // We do not check the EnableThreadSMRExtraValidityChecks option
 813   // for this includes() call because JVM/TI's spec is tighter.
 814   if (!t_list->includes(java_thread)) {
 815     // Not on the JavaThreads list so it is not alive.
 816     return JVMTI_ERROR_THREAD_NOT_ALIVE;
 817   }
 818 
 819   // Return a live JavaThread that is "protected" by the
 820   // ThreadsListHandle in the caller.
 821   *jt_pp = java_thread;
 822 
 823   return JVMTI_ERROR_NONE;
 824 }
 825 
 826 class JvmtiClassFileLoadHookPoster : public StackObj {
 827  private:
 828   Symbol*            _h_name;
 829   Handle               _class_loader;
 830   Handle               _h_protection_domain;
 831   unsigned char **     _data_ptr;
 832   unsigned char **     _end_ptr;
 833   JavaThread *         _thread;
 834   jint                 _curr_len;
 835   unsigned char *      _curr_data;
 836   JvmtiEnv *           _curr_env;
 837   JvmtiCachedClassFileData ** _cached_class_file_ptr;
 838   JvmtiThreadState *   _state;
 839   Klass*               _class_being_redefined;
 840   JvmtiClassLoadKind   _load_kind;
 841   bool                 _has_been_modified;
 842 
 843  public:
 844   inline JvmtiClassFileLoadHookPoster(Symbol* h_name, Handle class_loader,
 845                                       Handle h_protection_domain,
 846                                       unsigned char **data_ptr, unsigned char **end_ptr,
 847                                       JvmtiCachedClassFileData **cache_ptr) {
 848     _h_name = h_name;
 849     _class_loader = class_loader;
 850     _h_protection_domain = h_protection_domain;
 851     _data_ptr = data_ptr;
 852     _end_ptr = end_ptr;
 853     _thread = JavaThread::current();
 854     _curr_len = *end_ptr - *data_ptr;
 855     _curr_data = *data_ptr;
 856     _curr_env = NULL;
 857     _cached_class_file_ptr = cache_ptr;
 858     _has_been_modified = false;
 859 
 860     _state = _thread->jvmti_thread_state();
 861     if (_state != NULL) {
 862       _class_being_redefined = _state->get_class_being_redefined();
 863       _load_kind = _state->get_class_load_kind();
 864       Klass* klass = (_class_being_redefined == NULL) ? NULL : _class_being_redefined;
 865       if (_load_kind != jvmti_class_load_kind_load && klass != NULL) {
 866         ModuleEntry* module_entry = InstanceKlass::cast(klass)->module();
 867         assert(module_entry != NULL, "module_entry should always be set");
 868         if (module_entry->is_named() &&
 869             module_entry->module() != NULL &&
 870             !module_entry->has_default_read_edges()) {
 871           if (!module_entry->set_has_default_read_edges()) {
 872             // We won a potential race.
 873             // Add read edges to the unnamed modules of the bootstrap and app class loaders
 874             Handle class_module(_thread, module_entry->module()); // Obtain j.l.r.Module
 875             JvmtiExport::add_default_read_edges(class_module, _thread);
 876           }
 877         }
 878       }
 879       // Clear class_being_redefined flag here. The action
 880       // from agent handler could generate a new class file load
 881       // hook event and if it is not cleared the new event generated
 882       // from regular class file load could have this stale redefined
 883       // class handle info.
 884       _state->clear_class_being_redefined();
 885     } else {
 886       // redefine and retransform will always set the thread state
 887       _class_being_redefined = NULL;
 888       _load_kind = jvmti_class_load_kind_load;
 889     }
 890   }
 891 
 892   void post() {
 893     post_all_envs();
 894     copy_modified_data();
 895   }
 896 
 897   bool has_been_modified() { return _has_been_modified; }
 898 
 899  private:
 900   void post_all_envs() {
 901     if (_load_kind != jvmti_class_load_kind_retransform) {
 902       // for class load and redefine,
 903       // call the non-retransformable agents
 904       JvmtiEnvIterator it;
 905       for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
 906         if (!env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
 907           // non-retransformable agents cannot retransform back,
 908           // so no need to cache the original class file bytes
 909           post_to_env(env, false);
 910         }
 911       }
 912     }
 913     JvmtiEnvIterator it;
 914     for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
 915       // retransformable agents get all events
 916       if (env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
 917         // retransformable agents need to cache the original class file
 918         // bytes if changes are made via the ClassFileLoadHook
 919         post_to_env(env, true);
 920       }
 921     }
 922   }
 923 
 924   void post_to_env(JvmtiEnv* env, bool caching_needed) {
 925     if (env->phase() == JVMTI_PHASE_PRIMORDIAL && !env->early_class_hook_env()) {
 926       return;
 927     }
 928     unsigned char *new_data = NULL;
 929     jint new_len = 0;
 930     JvmtiClassFileLoadEventMark jem(_thread, _h_name, _class_loader,
 931                                     _h_protection_domain,
 932                                     _class_being_redefined);
 933     JvmtiJavaThreadEventTransition jet(_thread);
 934     jvmtiEventClassFileLoadHook callback = env->callbacks()->ClassFileLoadHook;
 935     if (callback != NULL) {
 936       (*callback)(env->jvmti_external(), jem.jni_env(),
 937                   jem.class_being_redefined(),
 938                   jem.jloader(), jem.class_name(),
 939                   jem.protection_domain(),
 940                   _curr_len, _curr_data,
 941                   &new_len, &new_data);
 942     }
 943     if (new_data != NULL) {
 944       // this agent has modified class data.
 945       _has_been_modified = true;
 946       if (caching_needed && *_cached_class_file_ptr == NULL) {
 947         // data has been changed by the new retransformable agent
 948         // and it hasn't already been cached, cache it
 949         JvmtiCachedClassFileData *p;
 950         p = (JvmtiCachedClassFileData *)os::malloc(
 951           offset_of(JvmtiCachedClassFileData, data) + _curr_len, mtInternal);
 952         if (p == NULL) {
 953           vm_exit_out_of_memory(offset_of(JvmtiCachedClassFileData, data) + _curr_len,
 954             OOM_MALLOC_ERROR,
 955             "unable to allocate cached copy of original class bytes");
 956         }
 957         p->length = _curr_len;
 958         memcpy(p->data, _curr_data, _curr_len);
 959         *_cached_class_file_ptr = p;
 960       }
 961 
 962       if (_curr_data != *_data_ptr) {
 963         // curr_data is previous agent modified class data.
 964         // And this has been changed by the new agent so
 965         // we can delete it now.
 966         _curr_env->Deallocate(_curr_data);
 967       }
 968 
 969       // Class file data has changed by the current agent.
 970       _curr_data = new_data;
 971       _curr_len = new_len;
 972       // Save the current agent env we need this to deallocate the
 973       // memory allocated by this agent.
 974       _curr_env = env;
 975     }
 976   }
 977 
 978   void copy_modified_data() {
 979     // if one of the agent has modified class file data.
 980     // Copy modified class data to new resources array.
 981     if (_curr_data != *_data_ptr) {
 982       *_data_ptr = NEW_RESOURCE_ARRAY(u1, _curr_len);
 983       memcpy(*_data_ptr, _curr_data, _curr_len);
 984       *_end_ptr = *_data_ptr + _curr_len;
 985       _curr_env->Deallocate(_curr_data);
 986     }
 987   }
 988 };
 989 
 990 bool JvmtiExport::_should_post_class_file_load_hook = false;
 991 
 992 // this entry is for class file load hook on class load, redefine and retransform
 993 bool JvmtiExport::post_class_file_load_hook(Symbol* h_name,
 994                                             Handle class_loader,
 995                                             Handle h_protection_domain,
 996                                             unsigned char **data_ptr,
 997                                             unsigned char **end_ptr,
 998                                             JvmtiCachedClassFileData **cache_ptr) {
 999   if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1000     return false;
1001   }
1002 
1003   JvmtiClassFileLoadHookPoster poster(h_name, class_loader,
1004                                       h_protection_domain,
1005                                       data_ptr, end_ptr,
1006                                       cache_ptr);
1007   poster.post();
1008   return poster.has_been_modified();
1009 }
1010 
1011 void JvmtiExport::report_unsupported(bool on) {
1012   // If any JVMTI service is turned on, we need to exit before native code
1013   // tries to access nonexistant services.
1014   if (on) {
1015     vm_exit_during_initialization("Java Kernel does not support JVMTI.");
1016   }
1017 }
1018 
1019 
1020 static inline Klass* oop_to_klass(oop obj) {
1021   Klass* k = obj->klass();
1022 
1023   // if the object is a java.lang.Class then return the java mirror
1024   if (k == SystemDictionary::Class_klass()) {
1025     if (!java_lang_Class::is_primitive(obj)) {
1026       k = java_lang_Class::as_Klass(obj);
1027       assert(k != NULL, "class for non-primitive mirror must exist");
1028     }
1029   }
1030   return k;
1031 }
1032 
1033 class JvmtiVMObjectAllocEventMark : public JvmtiClassEventMark  {
1034  private:
1035    jobject _jobj;
1036    jlong    _size;
1037  public:
1038    JvmtiVMObjectAllocEventMark(JavaThread *thread, oop obj) : JvmtiClassEventMark(thread, oop_to_klass(obj)) {
1039      _jobj = (jobject)to_jobject(obj);
1040      _size = obj->size() * wordSize;
1041    };
1042    jobject jni_jobject() { return _jobj; }
1043    jlong size() { return _size; }
1044 };
1045 
1046 class JvmtiCompiledMethodLoadEventMark : public JvmtiMethodEventMark {
1047  private:
1048   jint _code_size;
1049   const void *_code_data;
1050   jint _map_length;
1051   jvmtiAddrLocationMap *_map;
1052   const void *_compile_info;
1053  public:
1054   JvmtiCompiledMethodLoadEventMark(JavaThread *thread, nmethod *nm, void* compile_info_ptr = NULL)
1055           : JvmtiMethodEventMark(thread,methodHandle(thread, nm->method())) {
1056     _code_data = nm->insts_begin();
1057     _code_size = nm->insts_size();
1058     _compile_info = compile_info_ptr; // Set void pointer of compiledMethodLoad Event. Default value is NULL.
1059     JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nm, &_map, &_map_length);
1060   }
1061   ~JvmtiCompiledMethodLoadEventMark() {
1062      FREE_C_HEAP_ARRAY(jvmtiAddrLocationMap, _map);
1063   }
1064 
1065   jint code_size() { return _code_size; }
1066   const void *code_data() { return _code_data; }
1067   jint map_length() { return _map_length; }
1068   const jvmtiAddrLocationMap* map() { return _map; }
1069   const void *compile_info() { return _compile_info; }
1070 };
1071 
1072 
1073 
1074 class JvmtiMonitorEventMark : public JvmtiThreadEventMark {
1075 private:
1076   jobject _jobj;
1077 public:
1078   JvmtiMonitorEventMark(JavaThread *thread, oop object)
1079           : JvmtiThreadEventMark(thread){
1080      _jobj = to_jobject(object);
1081   }
1082   jobject jni_object() { return _jobj; }
1083 };
1084 
1085 ///////////////////////////////////////////////////////////////
1086 //
1087 // pending CompiledMethodUnload support
1088 //
1089 
1090 void JvmtiExport::post_compiled_method_unload(
1091        jmethodID method, const void *code_begin) {
1092   if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1093     return;
1094   }
1095   JavaThread* thread = JavaThread::current();
1096   EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
1097                  ("[%s] method compile unload event triggered",
1098                   JvmtiTrace::safe_get_thread_name(thread)));
1099 
1100   // post the event for each environment that has this event enabled.
1101   JvmtiEnvIterator it;
1102   for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1103     if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_UNLOAD)) {
1104       if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1105         continue;
1106       }
1107       EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
1108                 ("[%s] class compile method unload event sent jmethodID " PTR_FORMAT,
1109                  JvmtiTrace::safe_get_thread_name(thread), p2i(method)));
1110 
1111       ResourceMark rm(thread);
1112 
1113       JvmtiEventMark jem(thread);
1114       JvmtiJavaThreadEventTransition jet(thread);
1115       jvmtiEventCompiledMethodUnload callback = env->callbacks()->CompiledMethodUnload;
1116       if (callback != NULL) {
1117         (*callback)(env->jvmti_external(), method, code_begin);
1118       }
1119     }
1120   }
1121 }
1122 
1123 ///////////////////////////////////////////////////////////////
1124 //
1125 // JvmtiExport
1126 //
1127 
1128 void JvmtiExport::post_raw_breakpoint(JavaThread *thread, Method* method, address location) {
1129   HandleMark hm(thread);
1130   methodHandle mh(thread, method);
1131 
1132   JvmtiThreadState *state = thread->jvmti_thread_state();
1133   if (state == NULL) {
1134     return;
1135   }
1136   EVT_TRIG_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Trg Breakpoint triggered",
1137                       JvmtiTrace::safe_get_thread_name(thread)));
1138   JvmtiEnvThreadStateIterator it(state);
1139   for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1140     ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_BREAKPOINT);
1141     if (!ets->breakpoint_posted() && ets->is_enabled(JVMTI_EVENT_BREAKPOINT)) {
1142       ThreadState old_os_state = thread->osthread()->get_state();
1143       thread->osthread()->set_state(BREAKPOINTED);
1144       EVT_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Evt Breakpoint sent %s.%s @ " INTX_FORMAT,
1145                      JvmtiTrace::safe_get_thread_name(thread),
1146                      (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1147                      (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1148                      location - mh()->code_base() ));
1149 
1150       JvmtiEnv *env = ets->get_env();
1151       JvmtiLocationEventMark jem(thread, mh, location);
1152       JvmtiJavaThreadEventTransition jet(thread);
1153       jvmtiEventBreakpoint callback = env->callbacks()->Breakpoint;
1154       if (callback != NULL) {
1155         (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1156                     jem.jni_methodID(), jem.location());
1157       }
1158 
1159       ets->set_breakpoint_posted();
1160       thread->osthread()->set_state(old_os_state);
1161     }
1162   }
1163 }
1164 
1165 //////////////////////////////////////////////////////////////////////////////
1166 
1167 bool              JvmtiExport::_can_get_source_debug_extension            = false;
1168 bool              JvmtiExport::_can_maintain_original_method_order        = false;
1169 bool              JvmtiExport::_can_post_interpreter_events               = false;
1170 bool              JvmtiExport::_can_post_on_exceptions                    = false;
1171 bool              JvmtiExport::_can_post_breakpoint                       = false;
1172 bool              JvmtiExport::_can_post_field_access                     = false;
1173 bool              JvmtiExport::_can_post_field_modification               = false;
1174 bool              JvmtiExport::_can_post_method_entry                     = false;
1175 bool              JvmtiExport::_can_post_method_exit                      = false;
1176 bool              JvmtiExport::_can_pop_frame                             = false;
1177 bool              JvmtiExport::_can_force_early_return                    = false;
1178 
1179 bool              JvmtiExport::_early_vmstart_recorded                    = false;
1180 
1181 bool              JvmtiExport::_should_post_single_step                   = false;
1182 bool              JvmtiExport::_should_post_field_access                  = false;
1183 bool              JvmtiExport::_should_post_field_modification            = false;
1184 bool              JvmtiExport::_should_post_class_load                    = false;
1185 bool              JvmtiExport::_should_post_class_prepare                 = false;
1186 bool              JvmtiExport::_should_post_class_unload                  = false;
1187 bool              JvmtiExport::_should_post_thread_life                   = false;
1188 bool              JvmtiExport::_should_clean_up_heap_objects              = false;
1189 bool              JvmtiExport::_should_post_native_method_bind            = false;
1190 bool              JvmtiExport::_should_post_dynamic_code_generated        = false;
1191 bool              JvmtiExport::_should_post_data_dump                     = false;
1192 bool              JvmtiExport::_should_post_compiled_method_load          = false;
1193 bool              JvmtiExport::_should_post_compiled_method_unload        = false;
1194 bool              JvmtiExport::_should_post_monitor_contended_enter       = false;
1195 bool              JvmtiExport::_should_post_monitor_contended_entered     = false;
1196 bool              JvmtiExport::_should_post_monitor_wait                  = false;
1197 bool              JvmtiExport::_should_post_monitor_waited                = false;
1198 bool              JvmtiExport::_should_post_garbage_collection_start      = false;
1199 bool              JvmtiExport::_should_post_garbage_collection_finish     = false;
1200 bool              JvmtiExport::_should_post_object_free                   = false;
1201 bool              JvmtiExport::_should_post_resource_exhausted            = false;
1202 bool              JvmtiExport::_should_post_vm_object_alloc               = false;
1203 bool              JvmtiExport::_should_post_on_exceptions                 = false;
1204 
1205 ////////////////////////////////////////////////////////////////////////////////////////////////
1206 
1207 
1208 //
1209 // JVMTI single step management
1210 //
1211 void JvmtiExport::at_single_stepping_point(JavaThread *thread, Method* method, address location) {
1212   assert(JvmtiExport::should_post_single_step(), "must be single stepping");
1213 
1214   HandleMark hm(thread);
1215   methodHandle mh(thread, method);
1216 
1217   // update information about current location and post a step event
1218   JvmtiThreadState *state = thread->jvmti_thread_state();
1219   if (state == NULL) {
1220     return;
1221   }
1222   EVT_TRIG_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Trg Single Step triggered",
1223                       JvmtiTrace::safe_get_thread_name(thread)));
1224   if (!state->hide_single_stepping()) {
1225     if (state->is_pending_step_for_popframe()) {
1226       state->process_pending_step_for_popframe();
1227     }
1228     if (state->is_pending_step_for_earlyret()) {
1229       state->process_pending_step_for_earlyret();
1230     }
1231     JvmtiExport::post_single_step(thread, mh(), location);
1232   }
1233 }
1234 
1235 
1236 void JvmtiExport::expose_single_stepping(JavaThread *thread) {
1237   JvmtiThreadState *state = thread->jvmti_thread_state();
1238   if (state != NULL) {
1239     state->clear_hide_single_stepping();
1240   }
1241 }
1242 
1243 
1244 bool JvmtiExport::hide_single_stepping(JavaThread *thread) {
1245   JvmtiThreadState *state = thread->jvmti_thread_state();
1246   if (state != NULL && state->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1247     state->set_hide_single_stepping();
1248     return true;
1249   } else {
1250     return false;
1251   }
1252 }
1253 
1254 void JvmtiExport::post_class_load(JavaThread *thread, Klass* klass) {
1255   if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1256     return;
1257   }
1258   HandleMark hm(thread);
1259 
1260   EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Trg Class Load triggered",
1261                       JvmtiTrace::safe_get_thread_name(thread)));
1262   JvmtiThreadState* state = thread->jvmti_thread_state();
1263   if (state == NULL) {
1264     return;
1265   }
1266   JvmtiEnvThreadStateIterator it(state);
1267   for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1268     if (ets->is_enabled(JVMTI_EVENT_CLASS_LOAD)) {
1269       JvmtiEnv *env = ets->get_env();
1270       if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1271         continue;
1272       }
1273       EVT_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Evt Class Load sent %s",
1274                                          JvmtiTrace::safe_get_thread_name(thread),
1275                                          klass==NULL? "NULL" : klass->external_name() ));
1276       JvmtiClassEventMark jem(thread, klass);
1277       JvmtiJavaThreadEventTransition jet(thread);
1278       jvmtiEventClassLoad callback = env->callbacks()->ClassLoad;
1279       if (callback != NULL) {
1280         (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1281       }
1282     }
1283   }
1284 }
1285 
1286 
1287 void JvmtiExport::post_class_prepare(JavaThread *thread, Klass* klass) {
1288   if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1289     return;
1290   }
1291   HandleMark hm(thread);
1292 
1293   EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Trg Class Prepare triggered",
1294                       JvmtiTrace::safe_get_thread_name(thread)));
1295   JvmtiThreadState* state = thread->jvmti_thread_state();
1296   if (state == NULL) {
1297     return;
1298   }
1299   JvmtiEnvThreadStateIterator it(state);
1300   for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1301     if (ets->is_enabled(JVMTI_EVENT_CLASS_PREPARE)) {
1302       JvmtiEnv *env = ets->get_env();
1303       if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1304         continue;
1305       }
1306       EVT_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Evt Class Prepare sent %s",
1307                                             JvmtiTrace::safe_get_thread_name(thread),
1308                                             klass==NULL? "NULL" : klass->external_name() ));
1309       JvmtiClassEventMark jem(thread, klass);
1310       JvmtiJavaThreadEventTransition jet(thread);
1311       jvmtiEventClassPrepare callback = env->callbacks()->ClassPrepare;
1312       if (callback != NULL) {
1313         (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1314       }
1315     }
1316   }
1317 }
1318 
1319 void JvmtiExport::post_class_unload(Klass* klass) {
1320   if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1321     return;
1322   }
1323   Thread *thread = Thread::current();
1324   HandleMark hm(thread);
1325 
1326   EVT_TRIG_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Trg Class Unload triggered" ));
1327   if (JvmtiEventController::is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1328     assert(thread->is_VM_thread(), "wrong thread");
1329 
1330     // get JavaThread for whom we are proxy
1331     Thread *calling_thread = ((VMThread *)thread)->vm_operation()->calling_thread();
1332     if (!calling_thread->is_Java_thread()) {
1333       // cannot post an event to a non-JavaThread
1334       return;
1335     }
1336     JavaThread *real_thread = (JavaThread *)calling_thread;
1337 
1338     JvmtiEnvIterator it;
1339     for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1340       if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1341         continue;
1342       }
1343       if (env->is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1344         EVT_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Evt Class Unload sent %s",
1345                   klass==NULL? "NULL" : klass->external_name() ));
1346 
1347         // do everything manually, since this is a proxy - needs special care
1348         JNIEnv* jni_env = real_thread->jni_environment();
1349         jthread jt = (jthread)JNIHandles::make_local(real_thread, real_thread->threadObj());
1350         jclass jk = (jclass)JNIHandles::make_local(real_thread, klass->java_mirror());
1351 
1352         // Before we call the JVMTI agent, we have to set the state in the
1353         // thread for which we are proxying.
1354         JavaThreadState prev_state = real_thread->thread_state();
1355         assert(((Thread *)real_thread)->is_ConcurrentGC_thread() ||
1356                (real_thread->is_Java_thread() && prev_state == _thread_blocked),
1357                "should be ConcurrentGCThread or JavaThread at safepoint");
1358         real_thread->set_thread_state(_thread_in_native);
1359 
1360         jvmtiExtensionEvent callback = env->ext_callbacks()->ClassUnload;
1361         if (callback != NULL) {
1362           (*callback)(env->jvmti_external(), jni_env, jt, jk);
1363         }
1364 
1365         assert(real_thread->thread_state() == _thread_in_native,
1366                "JavaThread should be in native");
1367         real_thread->set_thread_state(prev_state);
1368 
1369         JNIHandles::destroy_local(jk);
1370         JNIHandles::destroy_local(jt);
1371       }
1372     }
1373   }
1374 }
1375 
1376 
1377 void JvmtiExport::post_thread_start(JavaThread *thread) {
1378   if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1379     return;
1380   }
1381   assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
1382 
1383   EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Trg Thread Start event triggered",
1384                       JvmtiTrace::safe_get_thread_name(thread)));
1385 
1386   // do JVMTI thread initialization (if needed)
1387   JvmtiEventController::thread_started(thread);
1388 
1389   // Do not post thread start event for hidden java thread.
1390   if (JvmtiEventController::is_enabled(JVMTI_EVENT_THREAD_START) &&
1391       !thread->is_hidden_from_external_view()) {
1392     JvmtiEnvIterator it;
1393     for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1394       if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1395         continue;
1396       }
1397       if (env->is_enabled(JVMTI_EVENT_THREAD_START)) {
1398         EVT_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Evt Thread Start event sent",
1399                      JvmtiTrace::safe_get_thread_name(thread) ));
1400 
1401         JvmtiThreadEventMark jem(thread);
1402         JvmtiJavaThreadEventTransition jet(thread);
1403         jvmtiEventThreadStart callback = env->callbacks()->ThreadStart;
1404         if (callback != NULL) {
1405           (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1406         }
1407       }
1408     }
1409   }
1410 }
1411 
1412 
1413 void JvmtiExport::post_thread_end(JavaThread *thread) {
1414   if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1415     return;
1416   }
1417   EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Trg Thread End event triggered",
1418                       JvmtiTrace::safe_get_thread_name(thread)));
1419 
1420   JvmtiThreadState *state = thread->jvmti_thread_state();
1421   if (state == NULL) {
1422     return;
1423   }
1424 
1425   // Do not post thread end event for hidden java thread.
1426   if (state->is_enabled(JVMTI_EVENT_THREAD_END) &&
1427       !thread->is_hidden_from_external_view()) {
1428 
1429     JvmtiEnvThreadStateIterator it(state);
1430     for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1431       if (ets->is_enabled(JVMTI_EVENT_THREAD_END)) {
1432         JvmtiEnv *env = ets->get_env();
1433         if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1434           continue;
1435         }
1436         EVT_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Evt Thread End event sent",
1437                      JvmtiTrace::safe_get_thread_name(thread) ));
1438 
1439         JvmtiThreadEventMark jem(thread);
1440         JvmtiJavaThreadEventTransition jet(thread);
1441         jvmtiEventThreadEnd callback = env->callbacks()->ThreadEnd;
1442         if (callback != NULL) {
1443           (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1444         }
1445       }
1446     }
1447   }
1448 }
1449 
1450 void JvmtiExport::post_object_free(JvmtiEnv* env, jlong tag) {
1451   assert(SafepointSynchronize::is_at_safepoint(), "must be executed at safepoint");
1452   assert(env->is_enabled(JVMTI_EVENT_OBJECT_FREE), "checking");
1453 
1454   EVT_TRIG_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Trg Object Free triggered" ));
1455   EVT_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Evt Object Free sent"));
1456 
1457   jvmtiEventObjectFree callback = env->callbacks()->ObjectFree;
1458   if (callback != NULL) {
1459     (*callback)(env->jvmti_external(), tag);
1460   }
1461 }
1462 
1463 void JvmtiExport::post_resource_exhausted(jint resource_exhausted_flags, const char* description) {
1464   EVT_TRIG_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Trg resource exhausted event triggered" ));
1465 
1466   JvmtiEnvIterator it;
1467   for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
1468     if (env->is_enabled(JVMTI_EVENT_RESOURCE_EXHAUSTED)) {
1469       EVT_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Evt resource exhausted event sent" ));
1470 
1471       JavaThread *thread  = JavaThread::current();
1472       JvmtiThreadEventMark jem(thread);
1473       JvmtiJavaThreadEventTransition jet(thread);
1474       jvmtiEventResourceExhausted callback = env->callbacks()->ResourceExhausted;
1475       if (callback != NULL) {
1476         (*callback)(env->jvmti_external(), jem.jni_env(),
1477                     resource_exhausted_flags, NULL, description);
1478       }
1479     }
1480   }
1481 }
1482 
1483 void JvmtiExport::post_method_entry(JavaThread *thread, Method* method, frame current_frame) {
1484   HandleMark hm(thread);
1485   methodHandle mh(thread, method);
1486 
1487   EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Trg Method Entry triggered %s.%s",
1488                      JvmtiTrace::safe_get_thread_name(thread),
1489                      (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1490                      (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1491 
1492   JvmtiThreadState* state = thread->jvmti_thread_state();
1493   if (state == NULL || !state->is_interp_only_mode()) {
1494     // for any thread that actually wants method entry, interp_only_mode is set
1495     return;
1496   }
1497 
1498   state->incr_cur_stack_depth();
1499 
1500   if (state->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1501     JvmtiEnvThreadStateIterator it(state);
1502     for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1503       if (ets->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1504         EVT_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Evt Method Entry sent %s.%s",
1505                                              JvmtiTrace::safe_get_thread_name(thread),
1506                                              (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1507                                              (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1508 
1509         JvmtiEnv *env = ets->get_env();
1510         JvmtiMethodEventMark jem(thread, mh);
1511         JvmtiJavaThreadEventTransition jet(thread);
1512         jvmtiEventMethodEntry callback = env->callbacks()->MethodEntry;
1513         if (callback != NULL) {
1514           (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_methodID());
1515         }
1516       }
1517     }
1518   }
1519 }
1520 
1521 void JvmtiExport::post_method_exit(JavaThread *thread, Method* method, frame current_frame) {
1522   HandleMark hm(thread);
1523   methodHandle mh(thread, method);
1524 
1525   EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Trg Method Exit triggered %s.%s",
1526                      JvmtiTrace::safe_get_thread_name(thread),
1527                      (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1528                      (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1529 
1530   JvmtiThreadState *state = thread->jvmti_thread_state();
1531   if (state == NULL || !state->is_interp_only_mode()) {
1532     // for any thread that actually wants method exit, interp_only_mode is set
1533     return;
1534   }
1535 
1536   // return a flag when a method terminates by throwing an exception
1537   // i.e. if an exception is thrown and it's not caught by the current method
1538   bool exception_exit = state->is_exception_detected() && !state->is_exception_caught();
1539 
1540 
1541   if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1542     Handle result;
1543     jvalue value;
1544     value.j = 0L;
1545 
1546     // if the method hasn't been popped because of an exception then we populate
1547     // the return_value parameter for the callback. At this point we only have
1548     // the address of a "raw result" and we just call into the interpreter to
1549     // convert this into a jvalue.
1550     if (!exception_exit) {
1551       oop oop_result;
1552       BasicType type = current_frame.interpreter_frame_result(&oop_result, &value);
1553       if (type == T_OBJECT || type == T_ARRAY) {
1554         result = Handle(thread, oop_result);
1555       }
1556     }
1557 
1558     JvmtiEnvThreadStateIterator it(state);
1559     for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1560       if (ets->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1561         EVT_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Evt Method Exit sent %s.%s",
1562                                             JvmtiTrace::safe_get_thread_name(thread),
1563                                             (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1564                                             (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1565 
1566         JvmtiEnv *env = ets->get_env();
1567         JvmtiMethodEventMark jem(thread, mh);
1568         if (result.not_null()) {
1569           value.l = JNIHandles::make_local(thread, result());
1570         }
1571         JvmtiJavaThreadEventTransition jet(thread);
1572         jvmtiEventMethodExit callback = env->callbacks()->MethodExit;
1573         if (callback != NULL) {
1574           (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1575                       jem.jni_methodID(), exception_exit,  value);
1576         }
1577       }
1578     }
1579   }
1580 
1581   if (state->is_enabled(JVMTI_EVENT_FRAME_POP)) {
1582     JvmtiEnvThreadStateIterator it(state);
1583     for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1584       int cur_frame_number = state->cur_stack_depth();
1585 
1586       if (ets->is_frame_pop(cur_frame_number)) {
1587         // we have a NotifyFramePop entry for this frame.
1588         // now check that this env/thread wants this event
1589         if (ets->is_enabled(JVMTI_EVENT_FRAME_POP)) {
1590           EVT_TRACE(JVMTI_EVENT_FRAME_POP, ("[%s] Evt Frame Pop sent %s.%s",
1591                                             JvmtiTrace::safe_get_thread_name(thread),
1592                                             (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1593                                             (mh() == NULL) ? "NULL" : mh()->name()->as_C_string() ));
1594 
1595           // we also need to issue a frame pop event for this frame
1596           JvmtiEnv *env = ets->get_env();
1597           JvmtiMethodEventMark jem(thread, mh);
1598           JvmtiJavaThreadEventTransition jet(thread);
1599           jvmtiEventFramePop callback = env->callbacks()->FramePop;
1600           if (callback != NULL) {
1601             (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1602                         jem.jni_methodID(), exception_exit);
1603           }
1604         }
1605         // remove the frame's entry
1606         ets->clear_frame_pop(cur_frame_number);
1607       }
1608     }
1609   }
1610 
1611   state->decr_cur_stack_depth();
1612 }
1613 
1614 
1615 // Todo: inline this for optimization
1616 void JvmtiExport::post_single_step(JavaThread *thread, Method* method, address location) {
1617   HandleMark hm(thread);
1618   methodHandle mh(thread, method);
1619 
1620   JvmtiThreadState *state = thread->jvmti_thread_state();
1621   if (state == NULL) {
1622     return;
1623   }
1624   JvmtiEnvThreadStateIterator it(state);
1625   for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1626     ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_SINGLE_STEP);
1627     if (!ets->single_stepping_posted() && ets->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1628       EVT_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Evt Single Step sent %s.%s @ " INTX_FORMAT,
1629                     JvmtiTrace::safe_get_thread_name(thread),
1630                     (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1631                     (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1632                     location - mh()->code_base() ));
1633 
1634       JvmtiEnv *env = ets->get_env();
1635       JvmtiLocationEventMark jem(thread, mh, location);
1636       JvmtiJavaThreadEventTransition jet(thread);
1637       jvmtiEventSingleStep callback = env->callbacks()->SingleStep;
1638       if (callback != NULL) {
1639         (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1640                     jem.jni_methodID(), jem.location());
1641       }
1642 
1643       ets->set_single_stepping_posted();
1644     }
1645   }
1646 }
1647 
1648 void JvmtiExport::post_exception_throw(JavaThread *thread, Method* method, address location, oop exception) {
1649   HandleMark hm(thread);
1650   methodHandle mh(thread, method);
1651   Handle exception_handle(thread, exception);
1652 
1653   JvmtiThreadState *state = thread->jvmti_thread_state();
1654   if (state == NULL) {
1655     return;
1656   }
1657 
1658   EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION, ("[%s] Trg Exception thrown triggered",
1659                       JvmtiTrace::safe_get_thread_name(thread)));
1660   if (!state->is_exception_detected()) {
1661     state->set_exception_detected();
1662     JvmtiEnvThreadStateIterator it(state);
1663     for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1664       if (ets->is_enabled(JVMTI_EVENT_EXCEPTION) && (exception != NULL)) {
1665 
1666         EVT_TRACE(JVMTI_EVENT_EXCEPTION,
1667                      ("[%s] Evt Exception thrown sent %s.%s @ " INTX_FORMAT,
1668                       JvmtiTrace::safe_get_thread_name(thread),
1669                       (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1670                       (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1671                       location - mh()->code_base() ));
1672 
1673         JvmtiEnv *env = ets->get_env();
1674         JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
1675 
1676         // It's okay to clear these exceptions here because we duplicate
1677         // this lookup in InterpreterRuntime::exception_handler_for_exception.
1678         EXCEPTION_MARK;
1679 
1680         bool should_repeat;
1681         vframeStream st(thread);
1682         assert(!st.at_end(), "cannot be at end");
1683         Method* current_method = NULL;
1684         // A GC may occur during the Method::fast_exception_handler_bci_for()
1685         // call below if it needs to load the constraint class. Using a
1686         // methodHandle to keep the 'current_method' from being deallocated
1687         // if GC happens.
1688         methodHandle current_mh = methodHandle(thread, current_method);
1689         int current_bci = -1;
1690         do {
1691           current_method = st.method();
1692           current_mh = methodHandle(thread, current_method);
1693           current_bci = st.bci();
1694           do {
1695             should_repeat = false;
1696             Klass* eh_klass = exception_handle()->klass();
1697             current_bci = Method::fast_exception_handler_bci_for(
1698               current_mh, eh_klass, current_bci, THREAD);
1699             if (HAS_PENDING_EXCEPTION) {
1700               exception_handle = Handle(thread, PENDING_EXCEPTION);
1701               CLEAR_PENDING_EXCEPTION;
1702               should_repeat = true;
1703             }
1704           } while (should_repeat && (current_bci != -1));
1705           st.next();
1706         } while ((current_bci < 0) && (!st.at_end()));
1707 
1708         jmethodID catch_jmethodID;
1709         if (current_bci < 0) {
1710           catch_jmethodID = 0;
1711           current_bci = 0;
1712         } else {
1713           catch_jmethodID = jem.to_jmethodID(current_mh);
1714         }
1715 
1716         JvmtiJavaThreadEventTransition jet(thread);
1717         jvmtiEventException callback = env->callbacks()->Exception;
1718         if (callback != NULL) {
1719           (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1720                       jem.jni_methodID(), jem.location(),
1721                       jem.exception(),
1722                       catch_jmethodID, current_bci);
1723         }
1724       }
1725     }
1726   }
1727 
1728   // frames may get popped because of this throw, be safe - invalidate cached depth
1729   state->invalidate_cur_stack_depth();
1730 }
1731 
1732 
1733 void JvmtiExport::notice_unwind_due_to_exception(JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) {
1734   HandleMark hm(thread);
1735   methodHandle mh(thread, method);
1736   Handle exception_handle(thread, exception);
1737 
1738   JvmtiThreadState *state = thread->jvmti_thread_state();
1739   if (state == NULL) {
1740     return;
1741   }
1742   EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
1743                     ("[%s] Trg unwind_due_to_exception triggered %s.%s @ %s" INTX_FORMAT " - %s",
1744                      JvmtiTrace::safe_get_thread_name(thread),
1745                      (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1746                      (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1747                      location==0? "no location:" : "",
1748                      location==0? 0 : location - mh()->code_base(),
1749                      in_handler_frame? "in handler frame" : "not handler frame" ));
1750 
1751   if (state->is_exception_detected()) {
1752 
1753     state->invalidate_cur_stack_depth();
1754     if (!in_handler_frame) {
1755       // Not in exception handler.
1756       if(state->is_interp_only_mode()) {
1757         // method exit and frame pop events are posted only in interp mode.
1758         // When these events are enabled code should be in running in interp mode.
1759         JvmtiExport::post_method_exit(thread, method, thread->last_frame());
1760         // The cached cur_stack_depth might have changed from the
1761         // operations of frame pop or method exit. We are not 100% sure
1762         // the cached cur_stack_depth is still valid depth so invalidate
1763         // it.
1764         state->invalidate_cur_stack_depth();
1765       }
1766     } else {
1767       // In exception handler frame. Report exception catch.
1768       assert(location != NULL, "must be a known location");
1769       // Update cur_stack_depth - the frames above the current frame
1770       // have been unwound due to this exception:
1771       assert(!state->is_exception_caught(), "exception must not be caught yet.");
1772       state->set_exception_caught();
1773 
1774       JvmtiEnvThreadStateIterator it(state);
1775       for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1776         if (ets->is_enabled(JVMTI_EVENT_EXCEPTION_CATCH) && (exception_handle() != NULL)) {
1777           EVT_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
1778                      ("[%s] Evt ExceptionCatch sent %s.%s @ " INTX_FORMAT,
1779                       JvmtiTrace::safe_get_thread_name(thread),
1780                       (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1781                       (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1782                       location - mh()->code_base() ));
1783 
1784           JvmtiEnv *env = ets->get_env();
1785           JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
1786           JvmtiJavaThreadEventTransition jet(thread);
1787           jvmtiEventExceptionCatch callback = env->callbacks()->ExceptionCatch;
1788           if (callback != NULL) {
1789             (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1790                       jem.jni_methodID(), jem.location(),
1791                       jem.exception());
1792           }
1793         }
1794       }
1795     }
1796   }
1797 }
1798 
1799 oop JvmtiExport::jni_GetField_probe(JavaThread *thread, jobject jobj, oop obj,
1800                                     Klass* klass, jfieldID fieldID, bool is_static) {
1801   if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) {
1802     // At least one field access watch is set so we have more work
1803     // to do. This wrapper is used by entry points that allow us
1804     // to create handles in post_field_access_by_jni().
1805     post_field_access_by_jni(thread, obj, klass, fieldID, is_static);
1806     // event posting can block so refetch oop if we were passed a jobj
1807     if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
1808   }
1809   return obj;
1810 }
1811 
1812 oop JvmtiExport::jni_GetField_probe_nh(JavaThread *thread, jobject jobj, oop obj,
1813                                        Klass* klass, jfieldID fieldID, bool is_static) {
1814   if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) {
1815     // At least one field access watch is set so we have more work
1816     // to do. This wrapper is used by "quick" entry points that don't
1817     // allow us to create handles in post_field_access_by_jni(). We
1818     // override that with a ResetNoHandleMark.
1819     ResetNoHandleMark rnhm;
1820     post_field_access_by_jni(thread, obj, klass, fieldID, is_static);
1821     // event posting can block so refetch oop if we were passed a jobj
1822     if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
1823   }
1824   return obj;
1825 }
1826 
1827 void JvmtiExport::post_field_access_by_jni(JavaThread *thread, oop obj,
1828                                            Klass* klass, jfieldID fieldID, bool is_static) {
1829   // We must be called with a Java context in order to provide reasonable
1830   // values for the klazz, method, and location fields. The callers of this
1831   // function don't make the call unless there is a Java context.
1832   assert(thread->has_last_Java_frame(), "must be called with a Java context");
1833 
1834   ResourceMark rm;
1835   fieldDescriptor fd;
1836   // if get_field_descriptor finds fieldID to be invalid, then we just bail
1837   bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
1838   assert(valid_fieldID == true,"post_field_access_by_jni called with invalid fieldID");
1839   if (!valid_fieldID) return;
1840   // field accesses are not watched so bail
1841   if (!fd.is_field_access_watched()) return;
1842 
1843   HandleMark hm(thread);
1844   Handle h_obj;
1845   if (!is_static) {
1846     // non-static field accessors have an object, but we need a handle
1847     assert(obj != NULL, "non-static needs an object");
1848     h_obj = Handle(thread, obj);
1849   }
1850   post_field_access(thread,
1851                     thread->last_frame().interpreter_frame_method(),
1852                     thread->last_frame().interpreter_frame_bcp(),
1853                     klass, h_obj, fieldID);
1854 }
1855 
1856 void JvmtiExport::post_field_access(JavaThread *thread, Method* method,
1857   address location, Klass* field_klass, Handle object, jfieldID field) {
1858 
1859   HandleMark hm(thread);
1860   methodHandle mh(thread, method);
1861 
1862   JvmtiThreadState *state = thread->jvmti_thread_state();
1863   if (state == NULL) {
1864     return;
1865   }
1866   EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Trg Field Access event triggered",
1867                       JvmtiTrace::safe_get_thread_name(thread)));
1868   JvmtiEnvThreadStateIterator it(state);
1869   for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
1870     if (ets->is_enabled(JVMTI_EVENT_FIELD_ACCESS)) {
1871       EVT_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Evt Field Access event sent %s.%s @ " INTX_FORMAT,
1872                      JvmtiTrace::safe_get_thread_name(thread),
1873                      (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
1874                      (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
1875                      location - mh()->code_base() ));
1876 
1877       JvmtiEnv *env = ets->get_env();
1878       JvmtiLocationEventMark jem(thread, mh, location);
1879       jclass field_jclass = jem.to_jclass(field_klass);
1880       jobject field_jobject = jem.to_jobject(object());
1881       JvmtiJavaThreadEventTransition jet(thread);
1882       jvmtiEventFieldAccess callback = env->callbacks()->FieldAccess;
1883       if (callback != NULL) {
1884         (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1885                     jem.jni_methodID(), jem.location(),
1886                     field_jclass, field_jobject, field);
1887       }
1888     }
1889   }
1890 }
1891 
1892 oop JvmtiExport::jni_SetField_probe(JavaThread *thread, jobject jobj, oop obj,
1893                                     Klass* klass, jfieldID fieldID, bool is_static,
1894                                     char sig_type, jvalue *value) {
1895   if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) {
1896     // At least one field modification watch is set so we have more work
1897     // to do. This wrapper is used by entry points that allow us
1898     // to create handles in post_field_modification_by_jni().
1899     post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value);
1900     // event posting can block so refetch oop if we were passed a jobj
1901     if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
1902   }
1903   return obj;
1904 }
1905 
1906 oop JvmtiExport::jni_SetField_probe_nh(JavaThread *thread, jobject jobj, oop obj,
1907                                        Klass* klass, jfieldID fieldID, bool is_static,
1908                                        char sig_type, jvalue *value) {
1909   if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) {
1910     // At least one field modification watch is set so we have more work
1911     // to do. This wrapper is used by "quick" entry points that don't
1912     // allow us to create handles in post_field_modification_by_jni(). We
1913     // override that with a ResetNoHandleMark.
1914     ResetNoHandleMark rnhm;
1915     post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value);
1916     // event posting can block so refetch oop if we were passed a jobj
1917     if (jobj != NULL) return JNIHandles::resolve_non_null(jobj);
1918   }
1919   return obj;
1920 }
1921 
1922 void JvmtiExport::post_field_modification_by_jni(JavaThread *thread, oop obj,
1923                                                  Klass* klass, jfieldID fieldID, bool is_static,
1924                                                  char sig_type, jvalue *value) {
1925   // We must be called with a Java context in order to provide reasonable
1926   // values for the klazz, method, and location fields. The callers of this
1927   // function don't make the call unless there is a Java context.
1928   assert(thread->has_last_Java_frame(), "must be called with Java context");
1929 
1930   ResourceMark rm;
1931   fieldDescriptor fd;
1932   // if get_field_descriptor finds fieldID to be invalid, then we just bail
1933   bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
1934   assert(valid_fieldID == true,"post_field_modification_by_jni called with invalid fieldID");
1935   if (!valid_fieldID) return;
1936   // field modifications are not watched so bail
1937   if (!fd.is_field_modification_watched()) return;
1938 
1939   HandleMark hm(thread);
1940 
1941   Handle h_obj;
1942   if (!is_static) {
1943     // non-static field accessors have an object, but we need a handle
1944     assert(obj != NULL, "non-static needs an object");
1945     h_obj = Handle(thread, obj);
1946   }
1947   post_field_modification(thread,
1948                           thread->last_frame().interpreter_frame_method(),
1949                           thread->last_frame().interpreter_frame_bcp(),
1950                           klass, h_obj, fieldID, sig_type, value);
1951 }
1952 
1953 void JvmtiExport::post_raw_field_modification(JavaThread *thread, Method* method,
1954   address location, Klass* field_klass, Handle object, jfieldID field,
1955   char sig_type, jvalue *value) {
1956 
1957   if (sig_type == 'I' || sig_type == 'Z' || sig_type == 'B' || sig_type == 'C' || sig_type == 'S') {
1958     // 'I' instructions are used for byte, char, short and int.
1959     // determine which it really is, and convert
1960     fieldDescriptor fd;
1961     bool found = JvmtiEnv::get_field_descriptor(field_klass, field, &fd);
1962     // should be found (if not, leave as is)
1963     if (found) {
1964       jint ival = value->i;
1965       // convert value from int to appropriate type
1966       switch (fd.field_type()) {
1967       case T_BOOLEAN:
1968         sig_type = 'Z';
1969         value->i = 0; // clear it
1970         value->z = (jboolean)ival;
1971         break;
1972       case T_BYTE:
1973         sig_type = 'B';
1974         value->i = 0; // clear it
1975         value->b = (jbyte)ival;
1976         break;
1977       case T_CHAR:
1978         sig_type = 'C';
1979         value->i = 0; // clear it
1980         value->c = (jchar)ival;
1981         break;
1982       case T_SHORT:
1983         sig_type = 'S';
1984         value->i = 0; // clear it
1985         value->s = (jshort)ival;
1986         break;
1987       case T_INT:
1988         // nothing to do
1989         break;
1990       default:
1991         // this is an integer instruction, should be one of above
1992         ShouldNotReachHere();
1993         break;
1994       }
1995     }
1996   }
1997 
1998   assert(sig_type != '[', "array should have sig_type == 'L'");
1999   bool handle_created = false;
2000 
2001   // convert oop to JNI handle.
2002   if (sig_type == 'L') {
2003     handle_created = true;
2004     value->l = (jobject)JNIHandles::make_local(thread, (oop)value->l);
2005   }
2006 
2007   post_field_modification(thread, method, location, field_klass, object, field, sig_type, value);
2008 
2009   // Destroy the JNI handle allocated above.
2010   if (handle_created) {
2011     JNIHandles::destroy_local(value->l);
2012   }
2013 }
2014 
2015 void JvmtiExport::post_field_modification(JavaThread *thread, Method* method,
2016   address location, Klass* field_klass, Handle object, jfieldID field,
2017   char sig_type, jvalue *value_ptr) {
2018 
2019   HandleMark hm(thread);
2020   methodHandle mh(thread, method);
2021 
2022   JvmtiThreadState *state = thread->jvmti_thread_state();
2023   if (state == NULL) {
2024     return;
2025   }
2026   EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
2027                      ("[%s] Trg Field Modification event triggered",
2028                       JvmtiTrace::safe_get_thread_name(thread)));
2029 
2030   JvmtiEnvThreadStateIterator it(state);
2031   for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2032     if (ets->is_enabled(JVMTI_EVENT_FIELD_MODIFICATION)) {
2033       EVT_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
2034                    ("[%s] Evt Field Modification event sent %s.%s @ " INTX_FORMAT,
2035                     JvmtiTrace::safe_get_thread_name(thread),
2036                     (mh() == NULL) ? "NULL" : mh()->klass_name()->as_C_string(),
2037                     (mh() == NULL) ? "NULL" : mh()->name()->as_C_string(),
2038                     location - mh()->code_base() ));
2039 
2040       JvmtiEnv *env = ets->get_env();
2041       JvmtiLocationEventMark jem(thread, mh, location);
2042       jclass field_jclass = jem.to_jclass(field_klass);
2043       jobject field_jobject = jem.to_jobject(object());
2044       JvmtiJavaThreadEventTransition jet(thread);
2045       jvmtiEventFieldModification callback = env->callbacks()->FieldModification;
2046       if (callback != NULL) {
2047         (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2048                     jem.jni_methodID(), jem.location(),
2049                     field_jclass, field_jobject, field, sig_type, *value_ptr);
2050       }
2051     }
2052   }
2053 }
2054 
2055 void JvmtiExport::post_native_method_bind(Method* method, address* function_ptr) {
2056   JavaThread* thread = JavaThread::current();
2057   assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
2058 
2059   HandleMark hm(thread);
2060   methodHandle mh(thread, method);
2061 
2062   EVT_TRIG_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Trg Native Method Bind event triggered",
2063                       JvmtiTrace::safe_get_thread_name(thread)));
2064 
2065   if (JvmtiEventController::is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
2066     JvmtiEnvIterator it;
2067     for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2068       if (env->is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
2069         EVT_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Evt Native Method Bind event sent",
2070                      JvmtiTrace::safe_get_thread_name(thread) ));
2071 
2072         JvmtiMethodEventMark jem(thread, mh);
2073         JvmtiJavaThreadEventTransition jet(thread);
2074         JNIEnv* jni_env = (env->phase() == JVMTI_PHASE_PRIMORDIAL) ? NULL : jem.jni_env();
2075         jvmtiEventNativeMethodBind callback = env->callbacks()->NativeMethodBind;
2076         if (callback != NULL) {
2077           (*callback)(env->jvmti_external(), jni_env, jem.jni_thread(),
2078                       jem.jni_methodID(), (void*)(*function_ptr), (void**)function_ptr);
2079         }
2080       }
2081     }
2082   }
2083 }
2084 
2085 // Returns a record containing inlining information for the given nmethod
2086 jvmtiCompiledMethodLoadInlineRecord* create_inline_record(nmethod* nm) {
2087   jint numstackframes = 0;
2088   jvmtiCompiledMethodLoadInlineRecord* record = (jvmtiCompiledMethodLoadInlineRecord*)NEW_RESOURCE_OBJ(jvmtiCompiledMethodLoadInlineRecord);
2089   record->header.kind = JVMTI_CMLR_INLINE_INFO;
2090   record->header.next = NULL;
2091   record->header.majorinfoversion = JVMTI_CMLR_MAJOR_VERSION_1;
2092   record->header.minorinfoversion = JVMTI_CMLR_MINOR_VERSION_0;
2093   record->numpcs = 0;
2094   for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
2095    if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
2096    record->numpcs++;
2097   }
2098   record->pcinfo = (PCStackInfo*)(NEW_RESOURCE_ARRAY(PCStackInfo, record->numpcs));
2099   int scope = 0;
2100   for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
2101     if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
2102     void* pc_address = (void*)p->real_pc(nm);
2103     assert(pc_address != NULL, "pc_address must be non-null");
2104     record->pcinfo[scope].pc = pc_address;
2105     numstackframes=0;
2106     for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != NULL;sd = sd->sender()) {
2107       numstackframes++;
2108     }
2109     assert(numstackframes != 0, "numstackframes must be nonzero.");
2110     record->pcinfo[scope].methods = (jmethodID *)NEW_RESOURCE_ARRAY(jmethodID, numstackframes);
2111     record->pcinfo[scope].bcis = (jint *)NEW_RESOURCE_ARRAY(jint, numstackframes);
2112     record->pcinfo[scope].numstackframes = numstackframes;
2113     int stackframe = 0;
2114     for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != NULL;sd = sd->sender()) {
2115       // 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()
2116       assert(sd->method() != NULL, "sd->method() cannot be null.");
2117       record->pcinfo[scope].methods[stackframe] = sd->method()->jmethod_id();
2118       record->pcinfo[scope].bcis[stackframe] = sd->bci();
2119       stackframe++;
2120     }
2121     scope++;
2122   }
2123   return record;
2124 }
2125 
2126 void JvmtiExport::post_compiled_method_load(nmethod *nm) {
2127   if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
2128     return;
2129   }
2130   JavaThread* thread = JavaThread::current();
2131 
2132   EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2133                  ("[%s] method compile load event triggered",
2134                  JvmtiTrace::safe_get_thread_name(thread)));
2135 
2136   JvmtiEnvIterator it;
2137   for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2138     if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) {
2139       if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
2140         continue;
2141       }
2142       EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2143                 ("[%s] class compile method load event sent %s.%s  ",
2144                 JvmtiTrace::safe_get_thread_name(thread),
2145                 (nm->method() == NULL) ? "NULL" : nm->method()->klass_name()->as_C_string(),
2146                 (nm->method() == NULL) ? "NULL" : nm->method()->name()->as_C_string()));
2147       ResourceMark rm(thread);
2148       HandleMark hm(thread);
2149 
2150       // Add inlining information
2151       jvmtiCompiledMethodLoadInlineRecord* inlinerecord = create_inline_record(nm);
2152       // Pass inlining information through the void pointer
2153       JvmtiCompiledMethodLoadEventMark jem(thread, nm, inlinerecord);
2154       JvmtiJavaThreadEventTransition jet(thread);
2155       jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad;
2156       if (callback != NULL) {
2157         (*callback)(env->jvmti_external(), jem.jni_methodID(),
2158                     jem.code_size(), jem.code_data(), jem.map_length(),
2159                     jem.map(), jem.compile_info());
2160       }
2161     }
2162   }
2163 }
2164 
2165 
2166 // post a COMPILED_METHOD_LOAD event for a given environment
2167 void JvmtiExport::post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length,
2168                                             const void *code_begin, const jint map_length,
2169                                             const jvmtiAddrLocationMap* map)
2170 {
2171   if (env->phase() <= JVMTI_PHASE_PRIMORDIAL) {
2172     return;
2173   }
2174   JavaThread* thread = JavaThread::current();
2175   EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2176                  ("[%s] method compile load event triggered (by GenerateEvents)",
2177                  JvmtiTrace::safe_get_thread_name(thread)));
2178   if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) {
2179 
2180     EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2181               ("[%s] class compile method load event sent (by GenerateEvents), jmethodID=" PTR_FORMAT,
2182                JvmtiTrace::safe_get_thread_name(thread), p2i(method)));
2183 
2184     JvmtiEventMark jem(thread);
2185     JvmtiJavaThreadEventTransition jet(thread);
2186     jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad;
2187     if (callback != NULL) {
2188       (*callback)(env->jvmti_external(), method,
2189                   length, code_begin, map_length,
2190                   map, NULL);
2191     }
2192   }
2193 }
2194 
2195 void JvmtiExport::post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) {
2196   assert(name != NULL && name[0] != '\0', "sanity check");
2197 
2198   JavaThread* thread = JavaThread::current();
2199   // In theory everyone coming thru here is in_vm but we need to be certain
2200   // because a callee will do a vm->native transition
2201   ThreadInVMfromUnknown __tiv;
2202 
2203   EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2204                  ("[%s] method dynamic code generated event triggered",
2205                  JvmtiTrace::safe_get_thread_name(thread)));
2206   JvmtiEnvIterator it;
2207   for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2208     if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
2209       EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2210                 ("[%s] dynamic code generated event sent for %s",
2211                 JvmtiTrace::safe_get_thread_name(thread), name));
2212       JvmtiEventMark jem(thread);
2213       JvmtiJavaThreadEventTransition jet(thread);
2214       jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
2215       jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
2216       if (callback != NULL) {
2217         (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
2218       }
2219     }
2220   }
2221 }
2222 
2223 void JvmtiExport::post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) {
2224   jvmtiPhase phase = JvmtiEnv::get_phase();
2225   if (phase == JVMTI_PHASE_PRIMORDIAL || phase == JVMTI_PHASE_START) {
2226     post_dynamic_code_generated_internal(name, code_begin, code_end);
2227   } else {
2228     // It may not be safe to post the event from this thread.  Defer all
2229     // postings to the service thread so that it can perform them in a safe
2230     // context and in-order.
2231     MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
2232     JvmtiDeferredEvent event = JvmtiDeferredEvent::dynamic_code_generated_event(
2233         name, code_begin, code_end);
2234     JvmtiDeferredEventQueue::enqueue(event);
2235   }
2236 }
2237 
2238 
2239 // post a DYNAMIC_CODE_GENERATED event for a given environment
2240 // used by GenerateEvents
2241 void JvmtiExport::post_dynamic_code_generated(JvmtiEnv* env, const char *name,
2242                                               const void *code_begin, const void *code_end)
2243 {
2244   JavaThread* thread = JavaThread::current();
2245   EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2246                  ("[%s] dynamic code generated event triggered (by GenerateEvents)",
2247                   JvmtiTrace::safe_get_thread_name(thread)));
2248   if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
2249     EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2250               ("[%s] dynamic code generated event sent for %s",
2251                JvmtiTrace::safe_get_thread_name(thread), name));
2252     JvmtiEventMark jem(thread);
2253     JvmtiJavaThreadEventTransition jet(thread);
2254     jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
2255     jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
2256     if (callback != NULL) {
2257       (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
2258     }
2259   }
2260 }
2261 
2262 // post a DynamicCodeGenerated event while holding locks in the VM.
2263 void JvmtiExport::post_dynamic_code_generated_while_holding_locks(const char* name,
2264                                                                   address code_begin, address code_end)
2265 {
2266   // register the stub with the current dynamic code event collector
2267   JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current());
2268   // state can only be NULL if the current thread is exiting which
2269   // should not happen since we're trying to post an event
2270   guarantee(state != NULL, "attempt to register stub via an exiting thread");
2271   JvmtiDynamicCodeEventCollector* collector = state->get_dynamic_code_event_collector();
2272   guarantee(collector != NULL, "attempt to register stub without event collector");
2273   collector->register_stub(name, code_begin, code_end);
2274 }
2275 
2276 // Collect all the vm internally allocated objects which are visible to java world
2277 void JvmtiExport::record_vm_internal_object_allocation(oop obj) {
2278   Thread* thread = Thread::current_or_null();
2279   if (thread != NULL && thread->is_Java_thread())  {
2280     // Can not take safepoint here.
2281     NoSafepointVerifier no_sfpt;
2282     // Can not take safepoint here so can not use state_for to get
2283     // jvmti thread state.
2284     JvmtiThreadState *state = ((JavaThread*)thread)->jvmti_thread_state();
2285     if (state != NULL ) {
2286       // state is non NULL when VMObjectAllocEventCollector is enabled.
2287       JvmtiVMObjectAllocEventCollector *collector;
2288       collector = state->get_vm_object_alloc_event_collector();
2289       if (collector != NULL && collector->is_enabled()) {
2290         // Don't record classes as these will be notified via the ClassLoad
2291         // event.
2292         if (obj->klass() != SystemDictionary::Class_klass()) {
2293           collector->record_allocation(obj);
2294         }
2295       }
2296     }
2297   }
2298 }
2299 
2300 void JvmtiExport::post_garbage_collection_finish() {
2301   Thread *thread = Thread::current(); // this event is posted from VM-Thread.
2302   EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
2303                  ("[%s] garbage collection finish event triggered",
2304                   JvmtiTrace::safe_get_thread_name(thread)));
2305   JvmtiEnvIterator it;
2306   for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2307     if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH)) {
2308       EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
2309                 ("[%s] garbage collection finish event sent",
2310                  JvmtiTrace::safe_get_thread_name(thread)));
2311       JvmtiThreadEventTransition jet(thread);
2312       // JNIEnv is NULL here because this event is posted from VM Thread
2313       jvmtiEventGarbageCollectionFinish callback = env->callbacks()->GarbageCollectionFinish;
2314       if (callback != NULL) {
2315         (*callback)(env->jvmti_external());
2316       }
2317     }
2318   }
2319 }
2320 
2321 void JvmtiExport::post_garbage_collection_start() {
2322   Thread* thread = Thread::current(); // this event is posted from vm-thread.
2323   EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
2324                  ("[%s] garbage collection start event triggered",
2325                   JvmtiTrace::safe_get_thread_name(thread)));
2326   JvmtiEnvIterator it;
2327   for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2328     if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_START)) {
2329       EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
2330                 ("[%s] garbage collection start event sent",
2331                  JvmtiTrace::safe_get_thread_name(thread)));
2332       JvmtiThreadEventTransition jet(thread);
2333       // JNIEnv is NULL here because this event is posted from VM Thread
2334       jvmtiEventGarbageCollectionStart callback = env->callbacks()->GarbageCollectionStart;
2335       if (callback != NULL) {
2336         (*callback)(env->jvmti_external());
2337       }
2338     }
2339   }
2340 }
2341 
2342 void JvmtiExport::post_data_dump() {
2343   Thread *thread = Thread::current();
2344   EVT_TRIG_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
2345                  ("[%s] data dump request event triggered",
2346                   JvmtiTrace::safe_get_thread_name(thread)));
2347   JvmtiEnvIterator it;
2348   for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2349     if (env->is_enabled(JVMTI_EVENT_DATA_DUMP_REQUEST)) {
2350       EVT_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
2351                 ("[%s] data dump request event sent",
2352                  JvmtiTrace::safe_get_thread_name(thread)));
2353      JvmtiThreadEventTransition jet(thread);
2354      // JNIEnv is NULL here because this event is posted from VM Thread
2355      jvmtiEventDataDumpRequest callback = env->callbacks()->DataDumpRequest;
2356      if (callback != NULL) {
2357        (*callback)(env->jvmti_external());
2358      }
2359     }
2360   }
2361 }
2362 
2363 void JvmtiExport::post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) {
2364   oop object = (oop)obj_mntr->object();
2365   JvmtiThreadState *state = thread->jvmti_thread_state();
2366   if (state == NULL) {
2367     return;
2368   }
2369 
2370   HandleMark hm(thread);
2371   Handle h(thread, object);
2372 
2373   EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2374                      ("[%s] montior contended enter event triggered",
2375                       JvmtiTrace::safe_get_thread_name(thread)));
2376 
2377   JvmtiEnvThreadStateIterator it(state);
2378   for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2379     if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTER)) {
2380       EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2381                    ("[%s] monitor contended enter event sent",
2382                     JvmtiTrace::safe_get_thread_name(thread)));
2383       JvmtiMonitorEventMark  jem(thread, h());
2384       JvmtiEnv *env = ets->get_env();
2385       JvmtiThreadEventTransition jet(thread);
2386       jvmtiEventMonitorContendedEnter callback = env->callbacks()->MonitorContendedEnter;
2387       if (callback != NULL) {
2388         (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2389       }
2390     }
2391   }
2392 }
2393 
2394 void JvmtiExport::post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) {
2395   oop object = (oop)obj_mntr->object();
2396   JvmtiThreadState *state = thread->jvmti_thread_state();
2397   if (state == NULL) {
2398     return;
2399   }
2400 
2401   HandleMark hm(thread);
2402   Handle h(thread, object);
2403 
2404   EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2405                      ("[%s] montior contended entered event triggered",
2406                       JvmtiTrace::safe_get_thread_name(thread)));
2407 
2408   JvmtiEnvThreadStateIterator it(state);
2409   for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2410     if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED)) {
2411       EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2412                    ("[%s] monitor contended enter event sent",
2413                     JvmtiTrace::safe_get_thread_name(thread)));
2414       JvmtiMonitorEventMark  jem(thread, h());
2415       JvmtiEnv *env = ets->get_env();
2416       JvmtiThreadEventTransition jet(thread);
2417       jvmtiEventMonitorContendedEntered callback = env->callbacks()->MonitorContendedEntered;
2418       if (callback != NULL) {
2419         (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2420       }
2421     }
2422   }
2423 }
2424 
2425 void JvmtiExport::post_monitor_wait(JavaThread *thread, oop object,
2426                                           jlong timeout) {
2427   JvmtiThreadState *state = thread->jvmti_thread_state();
2428   if (state == NULL) {
2429     return;
2430   }
2431 
2432   HandleMark hm(thread);
2433   Handle h(thread, object);
2434 
2435   EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2436                      ("[%s] montior wait event triggered",
2437                       JvmtiTrace::safe_get_thread_name(thread)));
2438 
2439   JvmtiEnvThreadStateIterator it(state);
2440   for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2441     if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAIT)) {
2442       EVT_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2443                    ("[%s] monitor wait event sent",
2444                     JvmtiTrace::safe_get_thread_name(thread)));
2445       JvmtiMonitorEventMark  jem(thread, h());
2446       JvmtiEnv *env = ets->get_env();
2447       JvmtiThreadEventTransition jet(thread);
2448       jvmtiEventMonitorWait callback = env->callbacks()->MonitorWait;
2449       if (callback != NULL) {
2450         (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2451                     jem.jni_object(), timeout);
2452       }
2453     }
2454   }
2455 }
2456 
2457 void JvmtiExport::post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) {
2458   oop object = (oop)obj_mntr->object();
2459   JvmtiThreadState *state = thread->jvmti_thread_state();
2460   if (state == NULL) {
2461     return;
2462   }
2463 
2464   HandleMark hm(thread);
2465   Handle h(thread, object);
2466 
2467   EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2468                      ("[%s] montior waited event triggered",
2469                       JvmtiTrace::safe_get_thread_name(thread)));
2470 
2471   JvmtiEnvThreadStateIterator it(state);
2472   for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
2473     if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAITED)) {
2474       EVT_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2475                    ("[%s] monitor waited event sent",
2476                     JvmtiTrace::safe_get_thread_name(thread)));
2477       JvmtiMonitorEventMark  jem(thread, h());
2478       JvmtiEnv *env = ets->get_env();
2479       JvmtiThreadEventTransition jet(thread);
2480       jvmtiEventMonitorWaited callback = env->callbacks()->MonitorWaited;
2481       if (callback != NULL) {
2482         (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2483                     jem.jni_object(), timed_out);
2484       }
2485     }
2486   }
2487 }
2488 
2489 
2490 void JvmtiExport::post_vm_object_alloc(JavaThread *thread,  oop object) {
2491   EVT_TRIG_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Trg vm object alloc triggered",
2492                       JvmtiTrace::safe_get_thread_name(thread)));
2493   if (object == NULL) {
2494     return;
2495   }
2496   HandleMark hm(thread);
2497   Handle h(thread, object);
2498   JvmtiEnvIterator it;
2499   for (JvmtiEnv* env = it.first(); env != NULL; env = it.next(env)) {
2500     if (env->is_enabled(JVMTI_EVENT_VM_OBJECT_ALLOC)) {
2501       EVT_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Evt vmobject alloc sent %s",
2502                                          JvmtiTrace::safe_get_thread_name(thread),
2503                                          object==NULL? "NULL" : object->klass()->external_name()));
2504 
2505       JvmtiVMObjectAllocEventMark jem(thread, h());
2506       JvmtiJavaThreadEventTransition jet(thread);
2507       jvmtiEventVMObjectAlloc callback = env->callbacks()->VMObjectAlloc;
2508       if (callback != NULL) {
2509         (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2510                     jem.jni_jobject(), jem.jni_class(), jem.size());
2511       }
2512     }
2513   }
2514 }
2515 
2516 ////////////////////////////////////////////////////////////////////////////////////////////////
2517 
2518 void JvmtiExport::cleanup_thread(JavaThread* thread) {
2519   assert(JavaThread::current() == thread, "thread is not current");
2520   MutexLocker mu(JvmtiThreadState_lock);
2521 
2522   if (thread->jvmti_thread_state() != NULL) {
2523     // This has to happen after the thread state is removed, which is
2524     // why it is not in post_thread_end_event like its complement
2525     // Maybe both these functions should be rolled into the posts?
2526     JvmtiEventController::thread_ended(thread);
2527   }
2528 }
2529 
2530 void JvmtiExport::clear_detected_exception(JavaThread* thread) {
2531   assert(JavaThread::current() == thread, "thread is not current");
2532 
2533   JvmtiThreadState* state = thread->jvmti_thread_state();
2534   if (state != NULL) {
2535     state->clear_exception_state();
2536   }
2537 }
2538 
2539 void JvmtiExport::oops_do(OopClosure* f) {
2540   JvmtiCurrentBreakpoints::oops_do(f);
2541   JvmtiVMObjectAllocEventCollector::oops_do_for_all_threads(f);
2542 }
2543 
2544 void JvmtiExport::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f) {
2545   JvmtiTagMap::weak_oops_do(is_alive, f);
2546 }
2547 
2548 void JvmtiExport::gc_epilogue() {
2549   JvmtiCurrentBreakpoints::gc_epilogue();
2550 }
2551 
2552 // Onload raw monitor transition.
2553 void JvmtiExport::transition_pending_onload_raw_monitors() {
2554   JvmtiPendingMonitors::transition_raw_monitors();
2555 }
2556 
2557 ////////////////////////////////////////////////////////////////////////////////////////////////
2558 #if INCLUDE_SERVICES
2559 // Attach is disabled if SERVICES is not included
2560 
2561 // type for the Agent_OnAttach entry point
2562 extern "C" {
2563   typedef jint (JNICALL *OnAttachEntry_t)(JavaVM*, char *, void *);
2564 }
2565 
2566 jint JvmtiExport::load_agent_library(const char *agent, const char *absParam,
2567                                      const char *options, outputStream* st) {
2568   char ebuf[1024] = {0};
2569   char buffer[JVM_MAXPATHLEN];
2570   void* library = NULL;
2571   jint result = JNI_ERR;
2572   const char *on_attach_symbols[] = AGENT_ONATTACH_SYMBOLS;
2573   size_t num_symbol_entries = ARRAY_SIZE(on_attach_symbols);
2574 
2575   // The abs paramter should be "true" or "false"
2576   bool is_absolute_path = (absParam != NULL) && (strcmp(absParam,"true")==0);
2577 
2578   // Initially marked as invalid. It will be set to valid if we can find the agent
2579   AgentLibrary *agent_lib = new AgentLibrary(agent, options, is_absolute_path, NULL);
2580 
2581   // Check for statically linked in agent. If not found then if the path is
2582   // absolute we attempt to load the library. Otherwise we try to load it
2583   // from the standard dll directory.
2584 
2585   if (!os::find_builtin_agent(agent_lib, on_attach_symbols, num_symbol_entries)) {
2586     if (is_absolute_path) {
2587       library = os::dll_load(agent, ebuf, sizeof ebuf);
2588     } else {
2589       // Try to load the agent from the standard dll directory
2590       if (os::dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(),
2591                              agent)) {
2592         library = os::dll_load(buffer, ebuf, sizeof ebuf);
2593       }
2594       if (library == NULL) {
2595         // not found - try OS default library path
2596         if (os::dll_build_name(buffer, sizeof(buffer), agent)) {
2597           library = os::dll_load(buffer, ebuf, sizeof ebuf);
2598         }
2599       }
2600     }
2601     if (library != NULL) {
2602       agent_lib->set_os_lib(library);
2603       agent_lib->set_valid();
2604     }
2605   }
2606   // If the library was loaded then we attempt to invoke the Agent_OnAttach
2607   // function
2608   if (agent_lib->valid()) {
2609     // Lookup the Agent_OnAttach function
2610     OnAttachEntry_t on_attach_entry = NULL;
2611     on_attach_entry = CAST_TO_FN_PTR(OnAttachEntry_t,
2612        os::find_agent_function(agent_lib, false, on_attach_symbols, num_symbol_entries));
2613     if (on_attach_entry == NULL) {
2614       // Agent_OnAttach missing - unload library
2615       if (!agent_lib->is_static_lib()) {
2616         os::dll_unload(library);
2617       }
2618       st->print_cr("%s is not available in %s",
2619                    on_attach_symbols[0], agent_lib->name());
2620       delete agent_lib;
2621     } else {
2622       // Invoke the Agent_OnAttach function
2623       JavaThread* THREAD = JavaThread::current();
2624       {
2625         extern struct JavaVM_ main_vm;
2626         JvmtiThreadEventMark jem(THREAD);
2627         JvmtiJavaThreadEventTransition jet(THREAD);
2628 
2629         result = (*on_attach_entry)(&main_vm, (char*)options, NULL);
2630       }
2631 
2632       // Agent_OnAttach may have used JNI
2633       if (HAS_PENDING_EXCEPTION) {
2634         CLEAR_PENDING_EXCEPTION;
2635       }
2636 
2637       // If OnAttach returns JNI_OK then we add it to the list of
2638       // agent libraries so that we can call Agent_OnUnload later.
2639       if (result == JNI_OK) {
2640         Arguments::add_loaded_agent(agent_lib);
2641       } else {
2642         delete agent_lib;
2643       }
2644 
2645       // Agent_OnAttach executed so completion status is JNI_OK
2646       st->print_cr("return code: %d", result);
2647       result = JNI_OK;
2648     }
2649   } else {
2650     st->print_cr("%s was not loaded.", agent);
2651     if (*ebuf != '\0') {
2652       st->print_cr("%s", ebuf);
2653     }
2654   }
2655   return result;
2656 }
2657 
2658 #endif // INCLUDE_SERVICES
2659 ////////////////////////////////////////////////////////////////////////////////////////////////
2660 
2661 // Setup current current thread for event collection.
2662 void JvmtiEventCollector::setup_jvmti_thread_state() {
2663   // set this event collector to be the current one.
2664   JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current());
2665   // state can only be NULL if the current thread is exiting which
2666   // should not happen since we're trying to configure for event collection
2667   guarantee(state != NULL, "exiting thread called setup_jvmti_thread_state");
2668   if (is_vm_object_alloc_event()) {
2669     _prev = state->get_vm_object_alloc_event_collector();
2670     state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)this);
2671   } else if (is_dynamic_code_event()) {
2672     _prev = state->get_dynamic_code_event_collector();
2673     state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)this);
2674   }
2675 }
2676 
2677 // Unset current event collection in this thread and reset it with previous
2678 // collector.
2679 void JvmtiEventCollector::unset_jvmti_thread_state() {
2680   JvmtiThreadState* state = JavaThread::current()->jvmti_thread_state();
2681   if (state != NULL) {
2682     // restore the previous event collector (if any)
2683     if (is_vm_object_alloc_event()) {
2684       if (state->get_vm_object_alloc_event_collector() == this) {
2685         state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)_prev);
2686       } else {
2687         // this thread's jvmti state was created during the scope of
2688         // the event collector.
2689       }
2690     } else {
2691       if (is_dynamic_code_event()) {
2692         if (state->get_dynamic_code_event_collector() == this) {
2693           state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)_prev);
2694         } else {
2695           // this thread's jvmti state was created during the scope of
2696           // the event collector.
2697         }
2698       }
2699     }
2700   }
2701 }
2702 
2703 // create the dynamic code event collector
2704 JvmtiDynamicCodeEventCollector::JvmtiDynamicCodeEventCollector() : _code_blobs(NULL) {
2705   if (JvmtiExport::should_post_dynamic_code_generated()) {
2706     setup_jvmti_thread_state();
2707   }
2708 }
2709 
2710 // iterate over any code blob descriptors collected and post a
2711 // DYNAMIC_CODE_GENERATED event to the profiler.
2712 JvmtiDynamicCodeEventCollector::~JvmtiDynamicCodeEventCollector() {
2713   assert(!JavaThread::current()->owns_locks(), "all locks must be released to post deferred events");
2714  // iterate over any code blob descriptors that we collected
2715  if (_code_blobs != NULL) {
2716    for (int i=0; i<_code_blobs->length(); i++) {
2717      JvmtiCodeBlobDesc* blob = _code_blobs->at(i);
2718      JvmtiExport::post_dynamic_code_generated(blob->name(), blob->code_begin(), blob->code_end());
2719      FreeHeap(blob);
2720    }
2721    delete _code_blobs;
2722  }
2723  unset_jvmti_thread_state();
2724 }
2725 
2726 // register a stub
2727 void JvmtiDynamicCodeEventCollector::register_stub(const char* name, address start, address end) {
2728  if (_code_blobs == NULL) {
2729    _code_blobs = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JvmtiCodeBlobDesc*>(1,true);
2730  }
2731  _code_blobs->append(new JvmtiCodeBlobDesc(name, start, end));
2732 }
2733 
2734 // Setup current thread to record vm allocated objects.
2735 JvmtiVMObjectAllocEventCollector::JvmtiVMObjectAllocEventCollector() : _allocated(NULL) {
2736   if (JvmtiExport::should_post_vm_object_alloc()) {
2737     _enable = true;
2738     setup_jvmti_thread_state();
2739   } else {
2740     _enable = false;
2741   }
2742 }
2743 
2744 // Post vm_object_alloc event for vm allocated objects visible to java
2745 // world.
2746 JvmtiVMObjectAllocEventCollector::~JvmtiVMObjectAllocEventCollector() {
2747   if (_allocated != NULL) {
2748     set_enabled(false);
2749     for (int i = 0; i < _allocated->length(); i++) {
2750       oop obj = _allocated->at(i);
2751       JvmtiExport::post_vm_object_alloc(JavaThread::current(), obj);
2752     }
2753     delete _allocated;
2754   }
2755   unset_jvmti_thread_state();
2756 }
2757 
2758 void JvmtiVMObjectAllocEventCollector::record_allocation(oop obj) {
2759   assert(is_enabled(), "VM object alloc event collector is not enabled");
2760   if (_allocated == NULL) {
2761     _allocated = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(1, true);
2762   }
2763   _allocated->push(obj);
2764 }
2765 
2766 // GC support.
2767 void JvmtiVMObjectAllocEventCollector::oops_do(OopClosure* f) {
2768   if (_allocated != NULL) {
2769     for(int i=_allocated->length() - 1; i >= 0; i--) {
2770       if (_allocated->at(i) != NULL) {
2771         f->do_oop(_allocated->adr_at(i));
2772       }
2773     }
2774   }
2775 }
2776 
2777 void JvmtiVMObjectAllocEventCollector::oops_do_for_all_threads(OopClosure* f) {
2778   // no-op if jvmti not enabled
2779   if (!JvmtiEnv::environments_might_exist()) {
2780     return;
2781   }
2782 
2783   for (JavaThreadIteratorWithHandle jtiwh; JavaThread *jthr = jtiwh.next(); ) {
2784     JvmtiThreadState *state = jthr->jvmti_thread_state();
2785     if (state != NULL) {
2786       JvmtiVMObjectAllocEventCollector *collector;
2787       collector = state->get_vm_object_alloc_event_collector();
2788       while (collector != NULL) {
2789         collector->oops_do(f);
2790         collector = (JvmtiVMObjectAllocEventCollector *)collector->get_prev();
2791       }
2792     }
2793   }
2794 }
2795 
2796 
2797 // Disable collection of VMObjectAlloc events
2798 NoJvmtiVMObjectAllocMark::NoJvmtiVMObjectAllocMark() : _collector(NULL) {
2799   // a no-op if VMObjectAlloc event is not enabled
2800   if (!JvmtiExport::should_post_vm_object_alloc()) {
2801     return;
2802   }
2803   Thread* thread = Thread::current_or_null();
2804   if (thread != NULL && thread->is_Java_thread())  {
2805     JavaThread* current_thread = (JavaThread*)thread;
2806     JvmtiThreadState *state = current_thread->jvmti_thread_state();
2807     if (state != NULL) {
2808       JvmtiVMObjectAllocEventCollector *collector;
2809       collector = state->get_vm_object_alloc_event_collector();
2810       if (collector != NULL && collector->is_enabled()) {
2811         _collector = collector;
2812         _collector->set_enabled(false);
2813       }
2814     }
2815   }
2816 }
2817 
2818 // Re-Enable collection of VMObjectAlloc events (if previously enabled)
2819 NoJvmtiVMObjectAllocMark::~NoJvmtiVMObjectAllocMark() {
2820   if (was_enabled()) {
2821     _collector->set_enabled(true);
2822   }
2823 };
2824 
2825 JvmtiGCMarker::JvmtiGCMarker() {
2826   // if there aren't any JVMTI environments then nothing to do
2827   if (!JvmtiEnv::environments_might_exist()) {
2828     return;
2829   }
2830 
2831   if (JvmtiExport::should_post_garbage_collection_start()) {
2832     JvmtiExport::post_garbage_collection_start();
2833   }
2834 
2835   if (SafepointSynchronize::is_at_safepoint()) {
2836     // Do clean up tasks that need to be done at a safepoint
2837     JvmtiEnvBase::check_for_periodic_clean_up();
2838   }
2839 }
2840 
2841 JvmtiGCMarker::~JvmtiGCMarker() {
2842   // if there aren't any JVMTI environments then nothing to do
2843   if (!JvmtiEnv::environments_might_exist()) {
2844     return;
2845   }
2846 
2847   // JVMTI notify gc finish
2848   if (JvmtiExport::should_post_garbage_collection_finish()) {
2849     JvmtiExport::post_garbage_collection_finish();
2850   }
2851 }