jdk8-mips64-public/hotspot: src/share/vm/prims/jvmtiEnv.cpp@2f716c0acb64 (annotated)

src/share/vm/prims/jvmtiEnv.cpp@2f716c0acb64 (annotated)

src/share/vm/prims/jvmtiEnv.cpp

Mon, 02 Mar 2009 14:05:07 -0700

author: dcubed
date: Mon, 02 Mar 2009 14:05:07 -0700
changeset 1046: 2f716c0acb64
parent 1044: ea20d7ce26b0
child 1557: dcb15a6f342d
child 1577: 4ce7240d622c
permissions: -rw-r--r--

6567360: 3/4 SIGBUS in jvmti RawMonitor magic check for unaligned bad monitor pointer
Summary: Change JvmtiEnvBase::is_valid() and JvmtiRawMonitor::is_valid() to fetch the _magic fields via Bytes::get_native_u[248]().
Reviewed-by: coleenp, swamyv

 /*
  * Copyright 2003-2007 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 # include "incls/_precompiled.incl"
 # include "incls/_jvmtiEnv.cpp.incl"
 #define FIXLATER 0 // REMOVE this when completed.
  // FIXLATER: hook into JvmtiTrace
 #define TraceJVMTICalls false
 JvmtiEnv::JvmtiEnv() : JvmtiEnvBase() {
 }
 JvmtiEnv::~JvmtiEnv() {
 }
 JvmtiEnv*
 JvmtiEnv::create_a_jvmti() {
   return new JvmtiEnv();
 }
 // VM operation class to copy jni function table at safepoint.
 // More than one java threads or jvmti agents may be reading/
 // modifying jni function tables. To reduce the risk of bad
 // interaction b/w these threads it is copied at safepoint.
 class VM_JNIFunctionTableCopier : public VM_Operation {
  private:
   const struct JNINativeInterface_ *_function_table;
  public:
   VM_JNIFunctionTableCopier(const struct JNINativeInterface_ *func_tbl) {
     _function_table = func_tbl;
   };
   VMOp_Type type() const { return VMOp_JNIFunctionTableCopier; }
   void doit() {
     copy_jni_function_table(_function_table);
   };
 };
 //
 // Do not change the "prefix" marker below, everything above it is copied
 // unchanged into the filled stub, everything below is controlled by the
 // stub filler (only method bodies are carried forward, and then only for
 // functionality still in the spec).
 //
 // end file prefix
   //
   // Memory Management functions
   //
 // mem_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::Allocate(jlong size, unsigned char** mem_ptr) {
   return allocate(size, mem_ptr);
 } /* end Allocate */
 // mem - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::Deallocate(unsigned char* mem) {
   return deallocate(mem);
 } /* end Deallocate */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // data - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::SetThreadLocalStorage(JavaThread* java_thread, const void* data) {
   JvmtiThreadState* state = java_thread->jvmti_thread_state();
   if (state == NULL) {
     if (data == NULL) {
       // leaving state unset same as data set to NULL
       return JVMTI_ERROR_NONE;
     }
     // otherwise, create the state
     state = JvmtiThreadState::state_for(java_thread);
     if (state == NULL) {
       return JVMTI_ERROR_THREAD_NOT_ALIVE;
     }
   }
   state->env_thread_state(this)->set_agent_thread_local_storage_data((void*)data);
   return JVMTI_ERROR_NONE;
 } /* end SetThreadLocalStorage */
 // Threads_lock NOT held
 // thread - NOT pre-checked
 // data_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetThreadLocalStorage(jthread thread, void** data_ptr) {
   JavaThread* current_thread = JavaThread::current();
   if (thread == NULL) {
     JvmtiThreadState* state = current_thread->jvmti_thread_state();
     *data_ptr = (state == NULL) ? NULL :
       state->env_thread_state(this)->get_agent_thread_local_storage_data();
   } else {
     // jvmti_GetThreadLocalStorage is "in native" and doesn't transition
     // the thread to _thread_in_vm. However, when the TLS for a thread
     // other than the current thread is required we need to transition
     // from native so as to resolve the jthread.
     ThreadInVMfromNative __tiv(current_thread);
     __ENTRY(jvmtiError, JvmtiEnv::GetThreadLocalStorage , current_thread)
     debug_only(VMNativeEntryWrapper __vew;)
     oop thread_oop = JNIHandles::resolve_external_guard(thread);
     if (thread_oop == NULL) {
       return JVMTI_ERROR_INVALID_THREAD;
     }
     if (!thread_oop->is_a(SystemDictionary::thread_klass())) {
       return JVMTI_ERROR_INVALID_THREAD;
     }
     JavaThread* java_thread = java_lang_Thread::thread(thread_oop);
     if (java_thread == NULL) {
       return JVMTI_ERROR_THREAD_NOT_ALIVE;
     }
     JvmtiThreadState* state = java_thread->jvmti_thread_state();
     *data_ptr = (state == NULL) ? NULL :
       state->env_thread_state(this)->get_agent_thread_local_storage_data();
   }
   return JVMTI_ERROR_NONE;
 } /* end GetThreadLocalStorage */
   //
   // Class functions
   //
 // class_count_ptr - pre-checked for NULL
 // classes_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetLoadedClasses(jint* class_count_ptr, jclass** classes_ptr) {
   return JvmtiGetLoadedClasses::getLoadedClasses(this, class_count_ptr, classes_ptr);
 } /* end GetLoadedClasses */
 // initiating_loader - NULL is a valid value, must be checked
 // class_count_ptr - pre-checked for NULL
 // classes_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetClassLoaderClasses(jobject initiating_loader, jint* class_count_ptr, jclass** classes_ptr) {
   return JvmtiGetLoadedClasses::getClassLoaderClasses(this, initiating_loader,
                                                   class_count_ptr, classes_ptr);
 } /* end GetClassLoaderClasses */
 // k_mirror - may be primitive, this must be checked
 // is_modifiable_class_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::IsModifiableClass(oop k_mirror, jboolean* is_modifiable_class_ptr) {
   *is_modifiable_class_ptr = VM_RedefineClasses::is_modifiable_class(k_mirror)?
                                                        JNI_TRUE : JNI_FALSE;
   return JVMTI_ERROR_NONE;
 } /* end IsModifiableClass */
 // class_count - pre-checked to be greater than or equal to 0
 // classes - pre-checked for NULL
 jvmtiError
 JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
 //TODO: add locking
   int index;
   JavaThread* current_thread = JavaThread::current();
   ResourceMark rm(current_thread);
   jvmtiClassDefinition* class_definitions =
                             NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count);
   NULL_CHECK(class_definitions, JVMTI_ERROR_OUT_OF_MEMORY);
   for (index = 0; index < class_count; index++) {
     HandleMark hm(current_thread);
     jclass jcls = classes[index];
     oop k_mirror = JNIHandles::resolve_external_guard(jcls);
     if (k_mirror == NULL) {
       return JVMTI_ERROR_INVALID_CLASS;
     }
     if (!k_mirror->is_a(SystemDictionary::class_klass())) {
       return JVMTI_ERROR_INVALID_CLASS;
     }
     if (java_lang_Class::is_primitive(k_mirror)) {
       return JVMTI_ERROR_UNMODIFIABLE_CLASS;
     }
     klassOop k_oop = java_lang_Class::as_klassOop(k_mirror);
     KlassHandle klass(current_thread, k_oop);
     jint status = klass->jvmti_class_status();
     if (status & (JVMTI_CLASS_STATUS_ERROR)) {
       return JVMTI_ERROR_INVALID_CLASS;
     }
     if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
       return JVMTI_ERROR_UNMODIFIABLE_CLASS;
     }
     instanceKlassHandle ikh(current_thread, k_oop);
     if (ikh->get_cached_class_file_bytes() == NULL) {
       // not cached, we need to reconstitute the class file from VM representation
       constantPoolHandle  constants(current_thread, ikh->constants());
       ObjectLocker ol(constants, current_thread);    // lock constant pool while we query it
       JvmtiClassFileReconstituter reconstituter(ikh);
       if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
         return reconstituter.get_error();
       }
       class_definitions[index].class_byte_count = (jint)reconstituter.class_file_size();
       class_definitions[index].class_bytes      = (unsigned char*)
                                                        reconstituter.class_file_bytes();
     } else {
       // it is cached, get it from the cache
       class_definitions[index].class_byte_count = ikh->get_cached_class_file_len();
       class_definitions[index].class_bytes      = ikh->get_cached_class_file_bytes();
     }
     class_definitions[index].klass              = jcls;
   }
   VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
   VMThread::execute(&op);
   return (op.check_error());
 } /* end RetransformClasses */
 // class_count - pre-checked to be greater than or equal to 0
 // class_definitions - pre-checked for NULL
 jvmtiError
 JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) {
 //TODO: add locking
   VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
   VMThread::execute(&op);
   return (op.check_error());
 } /* end RedefineClasses */
   //
   // Object functions
   //
 // size_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetObjectSize(jobject object, jlong* size_ptr) {
   oop mirror = JNIHandles::resolve_external_guard(object);
   NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
   if (mirror->klass() == SystemDictionary::class_klass()) {
     if (!java_lang_Class::is_primitive(mirror)) {
         mirror = java_lang_Class::as_klassOop(mirror);
         assert(mirror != NULL, "class for non-primitive mirror must exist");
     }
   }
   *size_ptr = mirror->size() * wordSize;
   return JVMTI_ERROR_NONE;
 } /* end GetObjectSize */
   //
   // Method functions
   //
 // prefix - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::SetNativeMethodPrefix(const char* prefix) {
   return prefix == NULL?
               SetNativeMethodPrefixes(0, NULL) :
               SetNativeMethodPrefixes(1, (char**)&prefix);
 } /* end SetNativeMethodPrefix */
 // prefix_count - pre-checked to be greater than or equal to 0
 // prefixes - pre-checked for NULL
 jvmtiError
 JvmtiEnv::SetNativeMethodPrefixes(jint prefix_count, char** prefixes) {
   // Have to grab JVMTI thread state lock to be sure that some thread
   // isn't accessing the prefixes at the same time we are setting them.
   // No locks during VM bring-up.
   if (Threads::number_of_threads() == 0) {
     return set_native_method_prefixes(prefix_count, prefixes);
   } else {
     MutexLocker mu(JvmtiThreadState_lock);
     return set_native_method_prefixes(prefix_count, prefixes);
   }
 } /* end SetNativeMethodPrefixes */
   //
   // Event Management functions
   //
 // callbacks - NULL is a valid value, must be checked
 // size_of_callbacks - pre-checked to be greater than or equal to 0
 jvmtiError
 JvmtiEnv::SetEventCallbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) {
   JvmtiEventController::set_event_callbacks(this, callbacks, size_of_callbacks);
   return JVMTI_ERROR_NONE;
 } /* end SetEventCallbacks */
 // event_thread - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::SetEventNotificationMode(jvmtiEventMode mode, jvmtiEvent event_type, jthread event_thread,   ...) {
   JavaThread* java_thread = NULL;
   if (event_thread != NULL) {
     oop thread_oop = JNIHandles::resolve_external_guard(event_thread);
     if (thread_oop == NULL) {
       return JVMTI_ERROR_INVALID_THREAD;
     }
     if (!thread_oop->is_a(SystemDictionary::thread_klass())) {
       return JVMTI_ERROR_INVALID_THREAD;
     }
     java_thread = java_lang_Thread::thread(thread_oop);
     if (java_thread == NULL) {
       return JVMTI_ERROR_THREAD_NOT_ALIVE;
     }
   }
   // event_type must be valid
   if (!JvmtiEventController::is_valid_event_type(event_type)) {
     return JVMTI_ERROR_INVALID_EVENT_TYPE;
   }
   // global events cannot be controlled at thread level.
   if (java_thread != NULL && JvmtiEventController::is_global_event(event_type)) {
     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
   }
   bool enabled = (mode == JVMTI_ENABLE);
   // assure that needed capabilities are present
   if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) {
     return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
   }
   if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) {
     record_class_file_load_hook_enabled();
   }
   JvmtiEventController::set_user_enabled(this, java_thread, event_type, enabled);
   return JVMTI_ERROR_NONE;
 } /* end SetEventNotificationMode */
   //
   // Capability functions
   //
 // capabilities_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetPotentialCapabilities(jvmtiCapabilities* capabilities_ptr) {
   JvmtiManageCapabilities::get_potential_capabilities(get_capabilities(),
                                                       get_prohibited_capabilities(),
                                                       capabilities_ptr);
   return JVMTI_ERROR_NONE;
 } /* end GetPotentialCapabilities */
 // capabilities_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::AddCapabilities(const jvmtiCapabilities* capabilities_ptr) {
   return JvmtiManageCapabilities::add_capabilities(get_capabilities(),
                                                    get_prohibited_capabilities(),
                                                    capabilities_ptr,
                                                    get_capabilities());
 } /* end AddCapabilities */
 // capabilities_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::RelinquishCapabilities(const jvmtiCapabilities* capabilities_ptr) {
   JvmtiManageCapabilities::relinquish_capabilities(get_capabilities(), capabilities_ptr, get_capabilities());
   return JVMTI_ERROR_NONE;
 } /* end RelinquishCapabilities */
 // capabilities_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetCapabilities(jvmtiCapabilities* capabilities_ptr) {
   JvmtiManageCapabilities::copy_capabilities(get_capabilities(), capabilities_ptr);
   return JVMTI_ERROR_NONE;
 } /* end GetCapabilities */
   //
   // Class Loader Search functions
   //
 // segment - pre-checked for NULL
 jvmtiError
 JvmtiEnv::AddToBootstrapClassLoaderSearch(const char* segment) {
   jvmtiPhase phase = get_phase();
   if (phase == JVMTI_PHASE_ONLOAD) {
     Arguments::append_sysclasspath(segment);
     return JVMTI_ERROR_NONE;
   } else {
     assert(phase == JVMTI_PHASE_LIVE, "sanity check");
     // create the zip entry
     ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment);
     if (zip_entry == NULL) {
       return JVMTI_ERROR_ILLEGAL_ARGUMENT;
     }
     // lock the loader
     Thread* thread = Thread::current();
     HandleMark hm;
     Handle loader_lock = Handle(thread, SystemDictionary::system_loader_lock());
     ObjectLocker ol(loader_lock, thread);
     // add the jar file to the bootclasspath
     if (TraceClassLoading) {
       tty->print_cr("[Opened %s]", zip_entry->name());
     }
     ClassLoader::add_to_list(zip_entry);
     return JVMTI_ERROR_NONE;
   }
 } /* end AddToBootstrapClassLoaderSearch */
 // segment - pre-checked for NULL
 jvmtiError
 JvmtiEnv::AddToSystemClassLoaderSearch(const char* segment) {
   jvmtiPhase phase = get_phase();
   if (phase == JVMTI_PHASE_ONLOAD) {
     for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
       if (strcmp("java.class.path", p->key()) == 0) {
         p->append_value(segment);
         break;
       }
     }
     return JVMTI_ERROR_NONE;
   } else {
     HandleMark hm;
     assert(phase == JVMTI_PHASE_LIVE, "sanity check");
     // create the zip entry (which will open the zip file and hence
     // check that the segment is indeed a zip file).
     ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment);
     if (zip_entry == NULL) {
       return JVMTI_ERROR_ILLEGAL_ARGUMENT;
     }
     delete zip_entry;   // no longer needed
     // lock the loader
     Thread* THREAD = Thread::current();
     Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
     ObjectLocker ol(loader, THREAD);
     // need the path as java.lang.String
     Handle path = java_lang_String::create_from_str(segment, THREAD);
     if (HAS_PENDING_EXCEPTION) {
       CLEAR_PENDING_EXCEPTION;
       return JVMTI_ERROR_INTERNAL;
     }
     instanceKlassHandle loader_ik(THREAD, loader->klass());
     // Invoke the appendToClassPathForInstrumentation method - if the method
     // is not found it means the loader doesn't support adding to the class path
     // in the live phase.
     {
       JavaValue res(T_VOID);
       JavaCalls::call_special(&res,
                               loader,
                               loader_ik,
                               vmSymbolHandles::appendToClassPathForInstrumentation_name(),
                               vmSymbolHandles::appendToClassPathForInstrumentation_signature(),
                               path,
                               THREAD);
       if (HAS_PENDING_EXCEPTION) {
         symbolOop ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
         CLEAR_PENDING_EXCEPTION;
         if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) {
           return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED;
         } else {
           return JVMTI_ERROR_INTERNAL;
         }
       }
     }
     return JVMTI_ERROR_NONE;
   }
 } /* end AddToSystemClassLoaderSearch */
   //
   // General functions
   //
 // phase_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) {
   *phase_ptr = get_phase();
   return JVMTI_ERROR_NONE;
 } /* end GetPhase */
 jvmtiError
 JvmtiEnv::DisposeEnvironment() {
   dispose();
   return JVMTI_ERROR_NONE;
 } /* end DisposeEnvironment */
 // data - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::SetEnvironmentLocalStorage(const void* data) {
   set_env_local_storage(data);
   return JVMTI_ERROR_NONE;
 } /* end SetEnvironmentLocalStorage */
 // data_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) {
   *data_ptr = (void*)get_env_local_storage();
   return JVMTI_ERROR_NONE;
 } /* end GetEnvironmentLocalStorage */
 // version_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetVersionNumber(jint* version_ptr) {
   *version_ptr = JVMTI_VERSION;
   return JVMTI_ERROR_NONE;
 } /* end GetVersionNumber */
 // name_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) {
   if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) {
     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
   }
   const char *name = JvmtiUtil::error_name(error);
   if (name == NULL) {
     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
   }
   size_t len = strlen(name) + 1;
   jvmtiError err = allocate(len, (unsigned char**)name_ptr);
   if (err == JVMTI_ERROR_NONE) {
     memcpy(*name_ptr, name, len);
   }
   return err;
 } /* end GetErrorName */
 jvmtiError
 JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) {
   switch (flag) {
   case JVMTI_VERBOSE_OTHER:
     // ignore
     break;
   case JVMTI_VERBOSE_CLASS:
     TraceClassLoading = value != 0;
     TraceClassUnloading = value != 0;
     break;
   case JVMTI_VERBOSE_GC:
     PrintGC = value != 0;
     TraceClassUnloading = value != 0;
     break;
   case JVMTI_VERBOSE_JNI:
     PrintJNIResolving = value != 0;
     break;
   default:
     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
   };
   return JVMTI_ERROR_NONE;
 } /* end SetVerboseFlag */
 // format_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) {
   *format_ptr = JVMTI_JLOCATION_JVMBCI;
   return JVMTI_ERROR_NONE;
 } /* end GetJLocationFormat */
 #ifndef JVMTI_KERNEL
   //
   // Thread functions
   //
 // Threads_lock NOT held
 // thread - NOT pre-checked
 // thread_state_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) {
   jint state;
   oop thread_oop;
   JavaThread* thr;
   if (thread == NULL) {
     thread_oop = JavaThread::current()->threadObj();
   } else {
     thread_oop = JNIHandles::resolve_external_guard(thread);
   }
   if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::thread_klass())) {
     return JVMTI_ERROR_INVALID_THREAD;
   }
   // get most state bits
   state = (jint)java_lang_Thread::get_thread_status(thread_oop);
   // add more state bits
   thr = java_lang_Thread::thread(thread_oop);
   if (thr != NULL) {
     JavaThreadState jts = thr->thread_state();
     if (thr->is_being_ext_suspended()) {
       state |= JVMTI_THREAD_STATE_SUSPENDED;
     }
     if (jts == _thread_in_native) {
       state |= JVMTI_THREAD_STATE_IN_NATIVE;
     }
     OSThread* osThread = thr->osthread();
     if (osThread != NULL && osThread->interrupted()) {
       state |= JVMTI_THREAD_STATE_INTERRUPTED;
     }
   }
   *thread_state_ptr = state;
   return JVMTI_ERROR_NONE;
 } /* end GetThreadState */
 // thread_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetCurrentThread(jthread* thread_ptr) {
   JavaThread* current_thread  = JavaThread::current();
   *thread_ptr = (jthread)JNIHandles::make_local(current_thread, current_thread->threadObj());
   return JVMTI_ERROR_NONE;
 } /* end GetCurrentThread */
 // threads_count_ptr - pre-checked for NULL
 // threads_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) {
   int nthreads        = 0;
   Handle *thread_objs = NULL;
   ResourceMark rm;
   HandleMark hm;
   // enumerate threads (including agent threads)
   ThreadsListEnumerator tle(Thread::current(), true);
   nthreads = tle.num_threads();
   *threads_count_ptr = nthreads;
   if (nthreads == 0) {
     *threads_ptr = NULL;
     return JVMTI_ERROR_NONE;
   }
   thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads);
   NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY);
   for (int i=0; i < nthreads; i++) {
     thread_objs[i] = Handle(tle.get_threadObj(i));
   }
   // have to make global handles outside of Threads_lock
   jthread *jthreads  = new_jthreadArray(nthreads, thread_objs);
   NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY);
   *threads_ptr = jthreads;
   return JVMTI_ERROR_NONE;
 } /* end GetAllThreads */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 jvmtiError
 JvmtiEnv::SuspendThread(JavaThread* java_thread) {
   // don't allow hidden thread suspend request.
   if (java_thread->is_hidden_from_external_view()) {
     return (JVMTI_ERROR_NONE);
   }
   {
     MutexLockerEx ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag);
     if (java_thread->is_external_suspend()) {
       // don't allow nested external suspend requests.
       return (JVMTI_ERROR_THREAD_SUSPENDED);
     }
     if (java_thread->is_exiting()) { // thread is in the process of exiting
       return (JVMTI_ERROR_THREAD_NOT_ALIVE);
     }
     java_thread->set_external_suspend();
   }
   if (!JvmtiSuspendControl::suspend(java_thread)) {
     // the thread was in the process of exiting
     return (JVMTI_ERROR_THREAD_NOT_ALIVE);
   }
   return JVMTI_ERROR_NONE;
 } /* end SuspendThread */
 // request_count - pre-checked to be greater than or equal to 0
 // request_list - pre-checked for NULL
 // results - pre-checked for NULL
 jvmtiError
 JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
   int needSafepoint = 0;  // > 0 if we need a safepoint
   for (int i = 0; i < request_count; i++) {
     JavaThread *java_thread = get_JavaThread(request_list[i]);
     if (java_thread == NULL) {
       results[i] = JVMTI_ERROR_INVALID_THREAD;
       continue;
     }
     // the thread has not yet run or has exited (not on threads list)
     if (java_thread->threadObj() == NULL) {
       results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
       continue;
     }
     if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) {
       results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
       continue;
     }
     // don't allow hidden thread suspend request.
     if (java_thread->is_hidden_from_external_view()) {
       results[i] = JVMTI_ERROR_NONE;  // indicate successful suspend
       continue;
     }
     {
       MutexLockerEx ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag);
       if (java_thread->is_external_suspend()) {
         // don't allow nested external suspend requests.
         results[i] = JVMTI_ERROR_THREAD_SUSPENDED;
         continue;
       }
       if (java_thread->is_exiting()) { // thread is in the process of exiting
         results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
         continue;
       }
       java_thread->set_external_suspend();
     }
     if (java_thread->thread_state() == _thread_in_native) {
       // We need to try and suspend native threads here. Threads in
       // other states will self-suspend on their next transition.
       if (!JvmtiSuspendControl::suspend(java_thread)) {
         // The thread was in the process of exiting. Force another
         // safepoint to make sure that this thread transitions.
         needSafepoint++;
         results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
         continue;
       }
     } else {
       needSafepoint++;
     }
     results[i] = JVMTI_ERROR_NONE;  // indicate successful suspend
   }
   if (needSafepoint > 0) {
     VM_ForceSafepoint vfs;
     VMThread::execute(&vfs);
   }
   // per-thread suspend results returned via results parameter
   return JVMTI_ERROR_NONE;
 } /* end SuspendThreadList */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 jvmtiError
 JvmtiEnv::ResumeThread(JavaThread* java_thread) {
   // don't allow hidden thread resume request.
   if (java_thread->is_hidden_from_external_view()) {
     return JVMTI_ERROR_NONE;
   }
   if (!java_thread->is_being_ext_suspended()) {
     return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
   }
   if (!JvmtiSuspendControl::resume(java_thread)) {
     return JVMTI_ERROR_INTERNAL;
   }
   return JVMTI_ERROR_NONE;
 } /* end ResumeThread */
 // request_count - pre-checked to be greater than or equal to 0
 // request_list - pre-checked for NULL
 // results - pre-checked for NULL
 jvmtiError
 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
   for (int i = 0; i < request_count; i++) {
     JavaThread *java_thread = get_JavaThread(request_list[i]);
     if (java_thread == NULL) {
       results[i] = JVMTI_ERROR_INVALID_THREAD;
       continue;
     }
     // don't allow hidden thread resume request.
     if (java_thread->is_hidden_from_external_view()) {
       results[i] = JVMTI_ERROR_NONE;  // indicate successful resume
       continue;
     }
     if (!java_thread->is_being_ext_suspended()) {
       results[i] = JVMTI_ERROR_THREAD_NOT_SUSPENDED;
       continue;
     }
     if (!JvmtiSuspendControl::resume(java_thread)) {
       results[i] = JVMTI_ERROR_INTERNAL;
       continue;
     }
     results[i] = JVMTI_ERROR_NONE;  // indicate successful suspend
   }
   // per-thread resume results returned via results parameter
   return JVMTI_ERROR_NONE;
 } /* end ResumeThreadList */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 jvmtiError
 JvmtiEnv::StopThread(JavaThread* java_thread, jobject exception) {
   oop e = JNIHandles::resolve_external_guard(exception);
   NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
   JavaThread::send_async_exception(java_thread->threadObj(), e);
   return JVMTI_ERROR_NONE;
 } /* end StopThread */
 // Threads_lock NOT held
 // thread - NOT pre-checked
 jvmtiError
 JvmtiEnv::InterruptThread(jthread thread) {
   oop thread_oop = JNIHandles::resolve_external_guard(thread);
   if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::thread_klass()))
     return JVMTI_ERROR_INVALID_THREAD;
   JavaThread* current_thread  = JavaThread::current();
   // Todo: this is a duplicate of JVM_Interrupt; share code in future
   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
   MutexLockerEx ml(current_thread->threadObj() == thread_oop ? NULL : Threads_lock);
   // We need to re-resolve the java_thread, since a GC might have happened during the
   // acquire of the lock
   JavaThread* java_thread = java_lang_Thread::thread(JNIHandles::resolve_external_guard(thread));
   NULL_CHECK(java_thread, JVMTI_ERROR_THREAD_NOT_ALIVE);
   Thread::interrupt(java_thread);
   return JVMTI_ERROR_NONE;
 } /* end InterruptThread */
 // Threads_lock NOT held
 // thread - NOT pre-checked
 // info_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
   ResourceMark rm;
   HandleMark hm;
   JavaThread* current_thread = JavaThread::current();
   // if thread is NULL the current thread is used
   oop thread_oop;
   if (thread == NULL) {
     thread_oop = current_thread->threadObj();
   } else {
     thread_oop = JNIHandles::resolve_external_guard(thread);
   }
   if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::thread_klass()))
     return JVMTI_ERROR_INVALID_THREAD;
   Handle thread_obj(current_thread, thread_oop);
   typeArrayHandle    name;
   ThreadPriority priority;
   Handle     thread_group;
   Handle context_class_loader;
   bool          is_daemon;
   { MutexLocker mu(Threads_lock);
     name = typeArrayHandle(current_thread, java_lang_Thread::name(thread_obj()));
     priority = java_lang_Thread::priority(thread_obj());
     thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
     is_daemon = java_lang_Thread::is_daemon(thread_obj());
     oop loader = java_lang_Thread::context_class_loader(thread_obj());
     context_class_loader = Handle(current_thread, loader);
   }
   { const char *n;
     if (name() != NULL) {
       n = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
     } else {
       n = UNICODE::as_utf8(NULL, 0);
     }
     info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
     if (info_ptr->name == NULL)
       return JVMTI_ERROR_OUT_OF_MEMORY;
     strcpy(info_ptr->name, n);
   }
   info_ptr->is_daemon = is_daemon;
   info_ptr->priority  = priority;
   info_ptr->context_class_loader = (context_class_loader.is_null()) ? NULL :
                                      jni_reference(context_class_loader);
   info_ptr->thread_group = jni_reference(thread_group);
   return JVMTI_ERROR_NONE;
 } /* end GetThreadInfo */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // owned_monitor_count_ptr - pre-checked for NULL
 // owned_monitors_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetOwnedMonitorInfo(JavaThread* java_thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
   jvmtiError err = JVMTI_ERROR_NONE;
   JavaThread* calling_thread = JavaThread::current();
   // growable array of jvmti monitors info on the C-heap
   GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
       new (ResourceObj::C_HEAP) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true);
   uint32_t debug_bits = 0;
   if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
     err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
   } else {
     // JVMTI get monitors info at safepoint. Do not require target thread to
     // be suspended.
     VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list);
     VMThread::execute(&op);
     err = op.result();
   }
   jint owned_monitor_count = owned_monitors_list->length();
   if (err == JVMTI_ERROR_NONE) {
     if ((err = allocate(owned_monitor_count * sizeof(jobject *),
                       (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
       // copy into the returned array
       for (int i = 0; i < owned_monitor_count; i++) {
         (*owned_monitors_ptr)[i] =
           ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
       }
       *owned_monitor_count_ptr = owned_monitor_count;
     }
   }
   // clean up.
   for (int i = 0; i < owned_monitor_count; i++) {
     deallocate((unsigned char*)owned_monitors_list->at(i));
   }
   delete owned_monitors_list;
   return err;
 } /* end GetOwnedMonitorInfo */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // monitor_info_count_ptr - pre-checked for NULL
 // monitor_info_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetOwnedMonitorStackDepthInfo(JavaThread* java_thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
   jvmtiError err = JVMTI_ERROR_NONE;
   JavaThread* calling_thread  = JavaThread::current();
   // growable array of jvmti monitors info on the C-heap
   GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
          new (ResourceObj::C_HEAP) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true);
   uint32_t debug_bits = 0;
   if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
     err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
   } else {
     // JVMTI get owned monitors info at safepoint. Do not require target thread to
     // be suspended.
     VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list);
     VMThread::execute(&op);
     err = op.result();
   }
   jint owned_monitor_count = owned_monitors_list->length();
   if (err == JVMTI_ERROR_NONE) {
     if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
                       (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
       // copy to output array.
       for (int i = 0; i < owned_monitor_count; i++) {
         (*monitor_info_ptr)[i].monitor =
           ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
         (*monitor_info_ptr)[i].stack_depth =
           ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
       }
     }
     *monitor_info_count_ptr = owned_monitor_count;
   }
   // clean up.
   for (int i = 0; i < owned_monitor_count; i++) {
     deallocate((unsigned char*)owned_monitors_list->at(i));
   }
   delete owned_monitors_list;
   return err;
 } /* end GetOwnedMonitorStackDepthInfo */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // monitor_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetCurrentContendedMonitor(JavaThread* java_thread, jobject* monitor_ptr) {
   jvmtiError err = JVMTI_ERROR_NONE;
   uint32_t debug_bits = 0;
   JavaThread* calling_thread  = JavaThread::current();
   if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
     err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr);
   } else {
     // get contended monitor information at safepoint.
     VM_GetCurrentContendedMonitor op(this, calling_thread, java_thread, monitor_ptr);
     VMThread::execute(&op);
     err = op.result();
   }
   return err;
 } /* end GetCurrentContendedMonitor */
 // Threads_lock NOT held
 // thread - NOT pre-checked
 // proc - pre-checked for NULL
 // arg - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
   oop thread_oop = JNIHandles::resolve_external_guard(thread);
   if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::thread_klass())) {
     return JVMTI_ERROR_INVALID_THREAD;
   }
   if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
     return JVMTI_ERROR_INVALID_PRIORITY;
   }
   //Thread-self
   JavaThread* current_thread = JavaThread::current();
   Handle thread_hndl(current_thread, thread_oop);
   {
     MutexLocker mu(Threads_lock); // grab Threads_lock
     JvmtiAgentThread *new_thread = new JvmtiAgentThread(this, proc, arg);
     // At this point it may be possible that no osthread was created for the
     // JavaThread due to lack of memory.
     if (new_thread == NULL || new_thread->osthread() == NULL) {
       if (new_thread) delete new_thread;
       return JVMTI_ERROR_OUT_OF_MEMORY;
     }
     java_lang_Thread::set_thread(thread_hndl(), new_thread);
     java_lang_Thread::set_priority(thread_hndl(), (ThreadPriority)priority);
     java_lang_Thread::set_daemon(thread_hndl());
     new_thread->set_threadObj(thread_hndl());
     Threads::add(new_thread);
     Thread::start(new_thread);
   } // unlock Threads_lock
   return JVMTI_ERROR_NONE;
 } /* end RunAgentThread */
   //
   // Thread Group functions
   //
 // group_count_ptr - pre-checked for NULL
 // groups_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
   JavaThread* current_thread = JavaThread::current();
   // Only one top level thread group now.
   *group_count_ptr = 1;
   // Allocate memory to store global-refs to the thread groups.
   // Assume this area is freed by caller.
   *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
   NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
   // Convert oop to Handle, then convert Handle to global-ref.
   {
     HandleMark hm(current_thread);
     Handle system_thread_group(current_thread, Universe::system_thread_group());
     *groups_ptr[0] = jni_reference(system_thread_group);
   }
   return JVMTI_ERROR_NONE;
 } /* end GetTopThreadGroups */
 // info_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
   ResourceMark rm;
   HandleMark hm;
   JavaThread* current_thread = JavaThread::current();
   Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
   NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
   typeArrayHandle name;
   Handle parent_group;
   bool is_daemon;
   ThreadPriority max_priority;
   { MutexLocker mu(Threads_lock);
     name         = typeArrayHandle(current_thread,
                                    java_lang_ThreadGroup::name(group_obj()));
     parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
     is_daemon    = java_lang_ThreadGroup::is_daemon(group_obj());
     max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
   }
   info_ptr->is_daemon    = is_daemon;
   info_ptr->max_priority = max_priority;
   info_ptr->parent       = jni_reference(parent_group);
   if (name() != NULL) {
     const char* n = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
     info_ptr->name = (char *)jvmtiMalloc(strlen(n)+1);
     NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
     strcpy(info_ptr->name, n);
   } else {
     info_ptr->name = NULL;
   }
   return JVMTI_ERROR_NONE;
 } /* end GetThreadGroupInfo */
 // thread_count_ptr - pre-checked for NULL
 // threads_ptr - pre-checked for NULL
 // group_count_ptr - pre-checked for NULL
 // groups_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
   JavaThread* current_thread = JavaThread::current();
   oop group_obj = (oop) JNIHandles::resolve_external_guard(group);
   NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
   Handle *thread_objs = NULL;
   Handle *group_objs  = NULL;
   int nthreads = 0;
   int ngroups = 0;
   int hidden_threads = 0;
   ResourceMark rm;
   HandleMark hm;
   Handle group_hdl(current_thread, group_obj);
   { MutexLocker mu(Threads_lock);
     nthreads = java_lang_ThreadGroup::nthreads(group_hdl());
     ngroups  = java_lang_ThreadGroup::ngroups(group_hdl());
     if (nthreads > 0) {
       objArrayOop threads = java_lang_ThreadGroup::threads(group_hdl());
       assert(nthreads <= threads->length(), "too many threads");
       thread_objs = NEW_RESOURCE_ARRAY(Handle,nthreads);
       for (int i=0, j=0; i<nthreads; i++) {
         oop thread_obj = threads->obj_at(i);
         assert(thread_obj != NULL, "thread_obj is NULL");
         JavaThread *javathread = java_lang_Thread::thread(thread_obj);
         // Filter out hidden java threads.
         if (javathread != NULL && javathread->is_hidden_from_external_view()) {
           hidden_threads++;
           continue;
         }
         thread_objs[j++] = Handle(current_thread, thread_obj);
       }
       nthreads -= hidden_threads;
     }
     if (ngroups > 0) {
       objArrayOop groups = java_lang_ThreadGroup::groups(group_hdl());
       assert(ngroups <= groups->length(), "too many threads");
       group_objs = NEW_RESOURCE_ARRAY(Handle,ngroups);
       for (int i=0; i<ngroups; i++) {
         oop group_obj = groups->obj_at(i);
         assert(group_obj != NULL, "group_obj != NULL");
         group_objs[i] = Handle(current_thread, group_obj);
       }
     }
   }
   // have to make global handles outside of Threads_lock
   *group_count_ptr  = ngroups;
   *thread_count_ptr = nthreads;
   *threads_ptr     = new_jthreadArray(nthreads, thread_objs);
   *groups_ptr      = new_jthreadGroupArray(ngroups, group_objs);
   if ((nthreads > 0) && (*threads_ptr == NULL)) {
     return JVMTI_ERROR_OUT_OF_MEMORY;
   }
   if ((ngroups > 0) && (*groups_ptr == NULL)) {
     return JVMTI_ERROR_OUT_OF_MEMORY;
   }
   return JVMTI_ERROR_NONE;
 } /* end GetThreadGroupChildren */
   //
   // Stack Frame functions
   //
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // max_frame_count - pre-checked to be greater than or equal to 0
 // frame_buffer - pre-checked for NULL
 // count_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetStackTrace(JavaThread* java_thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
   jvmtiError err = JVMTI_ERROR_NONE;
   uint32_t debug_bits = 0;
   if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
     err = get_stack_trace(java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
   } else {
     // JVMTI get stack trace at safepoint. Do not require target thread to
     // be suspended.
     VM_GetStackTrace op(this, java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
     VMThread::execute(&op);
     err = op.result();
   }
   return err;
 } /* end GetStackTrace */
 // max_frame_count - pre-checked to be greater than or equal to 0
 // stack_info_ptr - pre-checked for NULL
 // thread_count_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
   jvmtiError err = JVMTI_ERROR_NONE;
   JavaThread* calling_thread = JavaThread::current();
   // JVMTI get stack traces at safepoint.
   VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
   VMThread::execute(&op);
   *thread_count_ptr = op.final_thread_count();
   *stack_info_ptr = op.stack_info();
   err = op.result();
   return err;
 } /* end GetAllStackTraces */
 // thread_count - pre-checked to be greater than or equal to 0
 // thread_list - pre-checked for NULL
 // max_frame_count - pre-checked to be greater than or equal to 0
 // stack_info_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
   jvmtiError err = JVMTI_ERROR_NONE;
   // JVMTI get stack traces at safepoint.
   VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
   VMThread::execute(&op);
   err = op.result();
   if (err == JVMTI_ERROR_NONE) {
     *stack_info_ptr = op.stack_info();
   }
   return err;
 } /* end GetThreadListStackTraces */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // count_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetFrameCount(JavaThread* java_thread, jint* count_ptr) {
   jvmtiError err = JVMTI_ERROR_NONE;
   // retrieve or create JvmtiThreadState.
   JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
   if (state == NULL) {
     return JVMTI_ERROR_THREAD_NOT_ALIVE;
   }
   uint32_t debug_bits = 0;
   if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
     err = get_frame_count(state, count_ptr);
   } else {
     // get java stack frame count at safepoint.
     VM_GetFrameCount op(this, state, count_ptr);
     VMThread::execute(&op);
     err = op.result();
   }
   return err;
 } /* end GetFrameCount */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 jvmtiError
 JvmtiEnv::PopFrame(JavaThread* java_thread) {
   JavaThread* current_thread  = JavaThread::current();
   HandleMark hm(current_thread);
   uint32_t debug_bits = 0;
   // retrieve or create the state
   JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
   if (state == NULL) {
     return JVMTI_ERROR_THREAD_NOT_ALIVE;
   }
   // Check if java_thread is fully suspended
   if (!is_thread_fully_suspended(java_thread, true /* wait for suspend completion */, &debug_bits)) {
     return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
   }
   // Check to see if a PopFrame was already in progress
   if (java_thread->popframe_condition() != JavaThread::popframe_inactive) {
     // Probably possible for JVMTI clients to trigger this, but the
     // JPDA backend shouldn't allow this to happen
     return JVMTI_ERROR_INTERNAL;
   }
   {
     // Was workaround bug
     //    4812902: popFrame hangs if the method is waiting at a synchronize
     // Catch this condition and return an error to avoid hanging.
     // Now JVMTI spec allows an implementation to bail out with an opaque frame error.
     OSThread* osThread = java_thread->osthread();
     if (osThread->get_state() == MONITOR_WAIT) {
       return JVMTI_ERROR_OPAQUE_FRAME;
     }
   }
   {
     ResourceMark rm(current_thread);
     // Check if there are more than one Java frame in this thread, that the top two frames
     // are Java (not native) frames, and that there is no intervening VM frame
     int frame_count = 0;
     bool is_interpreted[2];
     intptr_t *frame_sp[2];
     // The 2-nd arg of constructor is needed to stop iterating at java entry frame.
     for (vframeStream vfs(java_thread, true); !vfs.at_end(); vfs.next()) {
       methodHandle mh(current_thread, vfs.method());
       if (mh->is_native()) return(JVMTI_ERROR_OPAQUE_FRAME);
       is_interpreted[frame_count] = vfs.is_interpreted_frame();
       frame_sp[frame_count] = vfs.frame_id();
       if (++frame_count > 1) break;
     }
     if (frame_count < 2)  {
       // We haven't found two adjacent non-native Java frames on the top.
       // There can be two situations here:
       //  1. There are no more java frames
       //  2. Two top java frames are separated by non-java native frames
       if(vframeFor(java_thread, 1) == NULL) {
         return JVMTI_ERROR_NO_MORE_FRAMES;
       } else {
         // Intervening non-java native or VM frames separate java frames.
         // Current implementation does not support this. See bug #5031735.
         // In theory it is possible to pop frames in such cases.
         return JVMTI_ERROR_OPAQUE_FRAME;
       }
     }
     // If any of the top 2 frames is a compiled one, need to deoptimize it
     for (int i = 0; i < 2; i++) {
       if (!is_interpreted[i]) {
         VM_DeoptimizeFrame op(java_thread, frame_sp[i]);
         VMThread::execute(&op);
       }
     }
     // Update the thread state to reflect that the top frame is popped
     // so that cur_stack_depth is maintained properly and all frameIDs
     // are invalidated.
     // The current frame will be popped later when the suspended thread
     // is resumed and right before returning from VM to Java.
     // (see call_VM_base() in assembler_<cpu>.cpp).
     // It's fine to update the thread state here because no JVMTI events
     // shall be posted for this PopFrame.
     state->update_for_pop_top_frame();
     java_thread->set_popframe_condition(JavaThread::popframe_pending_bit);
     // Set pending step flag for this popframe and it is cleared when next
     // step event is posted.
     state->set_pending_step_for_popframe();
   }
   return JVMTI_ERROR_NONE;
 } /* end PopFrame */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // java_thread - unchecked
 // depth - pre-checked as non-negative
 // method_ptr - pre-checked for NULL
 // location_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetFrameLocation(JavaThread* java_thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
   jvmtiError err = JVMTI_ERROR_NONE;
   uint32_t debug_bits = 0;
   if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
     err = get_frame_location(java_thread, depth, method_ptr, location_ptr);
   } else {
     // JVMTI get java stack frame location at safepoint.
     VM_GetFrameLocation op(this, java_thread, depth, method_ptr, location_ptr);
     VMThread::execute(&op);
     err = op.result();
   }
   return err;
 } /* end GetFrameLocation */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // java_thread - unchecked
 // depth - pre-checked as non-negative
 jvmtiError
 JvmtiEnv::NotifyFramePop(JavaThread* java_thread, jint depth) {
   ResourceMark rm;
   uint32_t debug_bits = 0;
   JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread);
   if (state == NULL) {
     return JVMTI_ERROR_THREAD_NOT_ALIVE;
   }
   if (!JvmtiEnv::is_thread_fully_suspended(java_thread, true, &debug_bits)) {
       return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
   }
   if (TraceJVMTICalls) {
     JvmtiSuspendControl::print();
   }
   vframe *vf = vframeFor(java_thread, depth);
   if (vf == NULL) {
     return JVMTI_ERROR_NO_MORE_FRAMES;
   }
   if (!vf->is_java_frame() || ((javaVFrame*) vf)->method()->is_native()) {
     return JVMTI_ERROR_OPAQUE_FRAME;
   }
   assert(vf->frame_pointer() != NULL, "frame pointer mustn't be NULL");
   int frame_number = state->count_frames() - depth;
   state->env_thread_state(this)->set_frame_pop(frame_number);
   return JVMTI_ERROR_NONE;
 } /* end NotifyFramePop */
   //
   // Force Early Return functions
   //
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 jvmtiError
 JvmtiEnv::ForceEarlyReturnObject(JavaThread* java_thread, jobject value) {
   jvalue val;
   val.l = value;
   return force_early_return(java_thread, val, atos);
 } /* end ForceEarlyReturnObject */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 jvmtiError
 JvmtiEnv::ForceEarlyReturnInt(JavaThread* java_thread, jint value) {
   jvalue val;
   val.i = value;
   return force_early_return(java_thread, val, itos);
 } /* end ForceEarlyReturnInt */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 jvmtiError
 JvmtiEnv::ForceEarlyReturnLong(JavaThread* java_thread, jlong value) {
   jvalue val;
   val.j = value;
   return force_early_return(java_thread, val, ltos);
 } /* end ForceEarlyReturnLong */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 jvmtiError
 JvmtiEnv::ForceEarlyReturnFloat(JavaThread* java_thread, jfloat value) {
   jvalue val;
   val.f = value;
   return force_early_return(java_thread, val, ftos);
 } /* end ForceEarlyReturnFloat */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 jvmtiError
 JvmtiEnv::ForceEarlyReturnDouble(JavaThread* java_thread, jdouble value) {
   jvalue val;
   val.d = value;
   return force_early_return(java_thread, val, dtos);
 } /* end ForceEarlyReturnDouble */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 jvmtiError
 JvmtiEnv::ForceEarlyReturnVoid(JavaThread* java_thread) {
   jvalue val;
   val.j = 0L;
   return force_early_return(java_thread, val, vtos);
 } /* end ForceEarlyReturnVoid */
   //
   // Heap functions
   //
 // klass - NULL is a valid value, must be checked
 // initial_object - NULL is a valid value, must be checked
 // callbacks - pre-checked for NULL
 // user_data - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
   // check klass if provided
   klassOop k_oop = NULL;
   if (klass != NULL) {
     oop k_mirror = JNIHandles::resolve_external_guard(klass);
     if (k_mirror == NULL) {
       return JVMTI_ERROR_INVALID_CLASS;
     }
     if (java_lang_Class::is_primitive(k_mirror)) {
       return JVMTI_ERROR_NONE;
     }
     k_oop = java_lang_Class::as_klassOop(k_mirror);
     if (k_oop == NULL) {
       return JVMTI_ERROR_INVALID_CLASS;
     }
   }
   Thread *thread = Thread::current();
   HandleMark hm(thread);
   KlassHandle kh (thread, k_oop);
   TraceTime t("FollowReferences", TraceJVMTIObjectTagging);
   JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, kh, initial_object, callbacks, user_data);
   return JVMTI_ERROR_NONE;
 } /* end FollowReferences */
 // klass - NULL is a valid value, must be checked
 // callbacks - pre-checked for NULL
 // user_data - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
   // check klass if provided
   klassOop k_oop = NULL;
   if (klass != NULL) {
     oop k_mirror = JNIHandles::resolve_external_guard(klass);
     if (k_mirror == NULL) {
       return JVMTI_ERROR_INVALID_CLASS;
     }
     if (java_lang_Class::is_primitive(k_mirror)) {
       return JVMTI_ERROR_NONE;
     }
     k_oop = java_lang_Class::as_klassOop(k_mirror);
     if (k_oop == NULL) {
       return JVMTI_ERROR_INVALID_CLASS;
     }
   }
   Thread *thread = Thread::current();
   HandleMark hm(thread);
   KlassHandle kh (thread, k_oop);
   TraceTime t("IterateThroughHeap", TraceJVMTIObjectTagging);
   JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, kh, callbacks, user_data);
   return JVMTI_ERROR_NONE;
 } /* end IterateThroughHeap */
 // tag_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
   oop o = JNIHandles::resolve_external_guard(object);
   NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
   *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
   return JVMTI_ERROR_NONE;
 } /* end GetTag */
 jvmtiError
 JvmtiEnv::SetTag(jobject object, jlong tag) {
   oop o = JNIHandles::resolve_external_guard(object);
   NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
   JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
   return JVMTI_ERROR_NONE;
 } /* end SetTag */
 // tag_count - pre-checked to be greater than or equal to 0
 // tags - pre-checked for NULL
 // count_ptr - pre-checked for NULL
 // object_result_ptr - NULL is a valid value, must be checked
 // tag_result_ptr - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
   TraceTime t("GetObjectsWithTags", TraceJVMTIObjectTagging);
   return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
 } /* end GetObjectsWithTags */
 jvmtiError
 JvmtiEnv::ForceGarbageCollection() {
   Universe::heap()->collect(GCCause::_jvmti_force_gc);
   return JVMTI_ERROR_NONE;
 } /* end ForceGarbageCollection */
   //
   // Heap (1.0) functions
   //
 // object_reference_callback - pre-checked for NULL
 // user_data - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
   oop o = JNIHandles::resolve_external_guard(object);
   NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
   JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
   return JVMTI_ERROR_NONE;
 } /* end IterateOverObjectsReachableFromObject */
 // heap_root_callback - NULL is a valid value, must be checked
 // stack_ref_callback - NULL is a valid value, must be checked
 // object_ref_callback - NULL is a valid value, must be checked
 // user_data - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
   TraceTime t("IterateOverReachableObjects", TraceJVMTIObjectTagging);
   JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
   return JVMTI_ERROR_NONE;
 } /* end IterateOverReachableObjects */
 // heap_object_callback - pre-checked for NULL
 // user_data - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
   TraceTime t("IterateOverHeap", TraceJVMTIObjectTagging);
   Thread *thread = Thread::current();
   HandleMark hm(thread);
   JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, KlassHandle(), heap_object_callback, user_data);
   return JVMTI_ERROR_NONE;
 } /* end IterateOverHeap */
 // k_mirror - may be primitive, this must be checked
 // heap_object_callback - pre-checked for NULL
 // user_data - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
   if (java_lang_Class::is_primitive(k_mirror)) {
     // DO PRIMITIVE CLASS PROCESSING
     return JVMTI_ERROR_NONE;
   }
   klassOop k_oop = java_lang_Class::as_klassOop(k_mirror);
   if (k_oop == NULL) {
     return JVMTI_ERROR_INVALID_CLASS;
   }
   Thread *thread = Thread::current();
   HandleMark hm(thread);
   KlassHandle klass (thread, k_oop);
   TraceTime t("IterateOverInstancesOfClass", TraceJVMTIObjectTagging);
   JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
   return JVMTI_ERROR_NONE;
 } /* end IterateOverInstancesOfClass */
   //
   // Local Variable functions
   //
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // java_thread - unchecked
 // depth - pre-checked as non-negative
 // value_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject* value_ptr) {
   JavaThread* current_thread = JavaThread::current();
   // rm object is created to clean up the javaVFrame created in
   // doit_prologue(), but after doit() is finished with it.
   ResourceMark rm(current_thread);
   VM_GetOrSetLocal op(java_thread, current_thread, depth, slot);
   VMThread::execute(&op);
   jvmtiError err = op.result();
   if (err != JVMTI_ERROR_NONE) {
     return err;
   } else {
     *value_ptr = op.value().l;
     return JVMTI_ERROR_NONE;
   }
 } /* end GetLocalObject */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // java_thread - unchecked
 // depth - pre-checked as non-negative
 // value_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint* value_ptr) {
   // rm object is created to clean up the javaVFrame created in
   // doit_prologue(), but after doit() is finished with it.
   ResourceMark rm;
   VM_GetOrSetLocal op(java_thread, depth, slot, T_INT);
   VMThread::execute(&op);
   *value_ptr = op.value().i;
   return op.result();
 } /* end GetLocalInt */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // java_thread - unchecked
 // depth - pre-checked as non-negative
 // value_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong* value_ptr) {
   // rm object is created to clean up the javaVFrame created in
   // doit_prologue(), but after doit() is finished with it.
   ResourceMark rm;
   VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG);
   VMThread::execute(&op);
   *value_ptr = op.value().j;
   return op.result();
 } /* end GetLocalLong */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // java_thread - unchecked
 // depth - pre-checked as non-negative
 // value_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat* value_ptr) {
   // rm object is created to clean up the javaVFrame created in
   // doit_prologue(), but after doit() is finished with it.
   ResourceMark rm;
   VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT);
   VMThread::execute(&op);
   *value_ptr = op.value().f;
   return op.result();
 } /* end GetLocalFloat */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // java_thread - unchecked
 // depth - pre-checked as non-negative
 // value_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble* value_ptr) {
   // rm object is created to clean up the javaVFrame created in
   // doit_prologue(), but after doit() is finished with it.
   ResourceMark rm;
   VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE);
   VMThread::execute(&op);
   *value_ptr = op.value().d;
   return op.result();
 } /* end GetLocalDouble */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // java_thread - unchecked
 // depth - pre-checked as non-negative
 jvmtiError
 JvmtiEnv::SetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject value) {
   // rm object is created to clean up the javaVFrame created in
   // doit_prologue(), but after doit() is finished with it.
   ResourceMark rm;
   jvalue val;
   val.l = value;
   VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val);
   VMThread::execute(&op);
   return op.result();
 } /* end SetLocalObject */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // java_thread - unchecked
 // depth - pre-checked as non-negative
 jvmtiError
 JvmtiEnv::SetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint value) {
   // rm object is created to clean up the javaVFrame created in
   // doit_prologue(), but after doit() is finished with it.
   ResourceMark rm;
   jvalue val;
   val.i = value;
   VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val);
   VMThread::execute(&op);
   return op.result();
 } /* end SetLocalInt */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // java_thread - unchecked
 // depth - pre-checked as non-negative
 jvmtiError
 JvmtiEnv::SetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong value) {
   // rm object is created to clean up the javaVFrame created in
   // doit_prologue(), but after doit() is finished with it.
   ResourceMark rm;
   jvalue val;
   val.j = value;
   VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val);
   VMThread::execute(&op);
   return op.result();
 } /* end SetLocalLong */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // java_thread - unchecked
 // depth - pre-checked as non-negative
 jvmtiError
 JvmtiEnv::SetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat value) {
   // rm object is created to clean up the javaVFrame created in
   // doit_prologue(), but after doit() is finished with it.
   ResourceMark rm;
   jvalue val;
   val.f = value;
   VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val);
   VMThread::execute(&op);
   return op.result();
 } /* end SetLocalFloat */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // java_thread - unchecked
 // depth - pre-checked as non-negative
 jvmtiError
 JvmtiEnv::SetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble value) {
   // rm object is created to clean up the javaVFrame created in
   // doit_prologue(), but after doit() is finished with it.
   ResourceMark rm;
   jvalue val;
   val.d = value;
   VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val);
   VMThread::execute(&op);
   return op.result();
 } /* end SetLocalDouble */
   //
   // Breakpoint functions
   //
 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
 jvmtiError
 JvmtiEnv::SetBreakpoint(methodOop method_oop, jlocation location) {
   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
   if (location < 0) {   // simple invalid location check first
     return JVMTI_ERROR_INVALID_LOCATION;
   }
   // verify that the breakpoint is not past the end of the method
   if (location >= (jlocation) method_oop->code_size()) {
     return JVMTI_ERROR_INVALID_LOCATION;
   }
   ResourceMark rm;
   JvmtiBreakpoint bp(method_oop, location);
   JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
   if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
     return JVMTI_ERROR_DUPLICATE;
   if (TraceJVMTICalls) {
     jvmti_breakpoints.print();
   }
   return JVMTI_ERROR_NONE;
 } /* end SetBreakpoint */
 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
 jvmtiError
 JvmtiEnv::ClearBreakpoint(methodOop method_oop, jlocation location) {
   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
   if (location < 0) {   // simple invalid location check first
     return JVMTI_ERROR_INVALID_LOCATION;
   }
   // verify that the breakpoint is not past the end of the method
   if (location >= (jlocation) method_oop->code_size()) {
     return JVMTI_ERROR_INVALID_LOCATION;
   }
   JvmtiBreakpoint bp(method_oop, location);
   JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
   if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
     return JVMTI_ERROR_NOT_FOUND;
   if (TraceJVMTICalls) {
     jvmti_breakpoints.print();
   }
   return JVMTI_ERROR_NONE;
 } /* end ClearBreakpoint */
   //
   // Watched Field functions
   //
 jvmtiError
 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
   // make sure we haven't set this watch before
   if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
   fdesc_ptr->set_is_field_access_watched(true);
   update_klass_field_access_flag(fdesc_ptr);
   JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
   return JVMTI_ERROR_NONE;
 } /* end SetFieldAccessWatch */
 jvmtiError
 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
   // make sure we have a watch to clear
   if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
   fdesc_ptr->set_is_field_access_watched(false);
   update_klass_field_access_flag(fdesc_ptr);
   JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
   return JVMTI_ERROR_NONE;
 } /* end ClearFieldAccessWatch */
 jvmtiError
 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
   // make sure we haven't set this watch before
   if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
   fdesc_ptr->set_is_field_modification_watched(true);
   update_klass_field_access_flag(fdesc_ptr);
   JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
   return JVMTI_ERROR_NONE;
 } /* end SetFieldModificationWatch */
 jvmtiError
 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
    // make sure we have a watch to clear
   if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
   fdesc_ptr->set_is_field_modification_watched(false);
   update_klass_field_access_flag(fdesc_ptr);
   JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
   return JVMTI_ERROR_NONE;
 } /* end ClearFieldModificationWatch */
   //
   // Class functions
   //
 // k_mirror - may be primitive, this must be checked
 // signature_ptr - NULL is a valid value, must be checked
 // generic_ptr - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
   ResourceMark rm;
   bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
   klassOop k = NULL;
   if (!isPrimitive) {
     k = java_lang_Class::as_klassOop(k_mirror);
     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
   }
   if (signature_ptr != NULL) {
     char* result = NULL;
     if (isPrimitive) {
       char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
       result = (char*) jvmtiMalloc(2);
       result[0] = tchar;
       result[1] = '\0';
     } else {
       const char* class_sig = Klass::cast(k)->signature_name();
       result = (char *) jvmtiMalloc(strlen(class_sig)+1);
       strcpy(result, class_sig);
     }
     *signature_ptr = result;
   }
   if (generic_ptr != NULL) {
     *generic_ptr = NULL;
     if (!isPrimitive && Klass::cast(k)->oop_is_instance()) {
       symbolOop soo = instanceKlass::cast(k)->generic_signature();
       if (soo != NULL) {
         const char *gen_sig = soo->as_C_string();
         if (gen_sig != NULL) {
           char* gen_result;
           jvmtiError err = allocate(strlen(gen_sig) + 1,
                                     (unsigned char **)&gen_result);
           if (err != JVMTI_ERROR_NONE) {
             return err;
           }
           strcpy(gen_result, gen_sig);
           *generic_ptr = gen_result;
         }
       }
     }
   }
   return JVMTI_ERROR_NONE;
 } /* end GetClassSignature */
 // k_mirror - may be primitive, this must be checked
 // status_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
   jint result = 0;
   if (java_lang_Class::is_primitive(k_mirror)) {
     result |= JVMTI_CLASS_STATUS_PRIMITIVE;
   } else {
     klassOop k = java_lang_Class::as_klassOop(k_mirror);
     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
     result = Klass::cast(k)->jvmti_class_status();
   }
   *status_ptr = result;
   return JVMTI_ERROR_NONE;
 } /* end GetClassStatus */
 // k_mirror - may be primitive, this must be checked
 // source_name_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
   if (java_lang_Class::is_primitive(k_mirror)) {
      return JVMTI_ERROR_ABSENT_INFORMATION;
   }
   klassOop k_klass = java_lang_Class::as_klassOop(k_mirror);
   NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
   if (!Klass::cast(k_klass)->oop_is_instance()) {
     return JVMTI_ERROR_ABSENT_INFORMATION;
   }
   symbolOop sfnOop = instanceKlass::cast(k_klass)->source_file_name();
   NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
   {
     JavaThread* current_thread  = JavaThread::current();
     ResourceMark rm(current_thread);
     const char* sfncp = (const char*) sfnOop->as_C_string();
     *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
     strcpy(*source_name_ptr, sfncp);
   }
   return JVMTI_ERROR_NONE;
 } /* end GetSourceFileName */
 // k_mirror - may be primitive, this must be checked
 // modifiers_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
   JavaThread* current_thread  = JavaThread::current();
   jint result = 0;
   if (!java_lang_Class::is_primitive(k_mirror)) {
     klassOop k = java_lang_Class::as_klassOop(k_mirror);
     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
     assert((Klass::cast(k)->oop_is_instance() || Klass::cast(k)->oop_is_array()), "should be an instance or an array klass");
     result = Klass::cast(k)->compute_modifier_flags(current_thread);
     JavaThread* THREAD = current_thread; // pass to macros
     if (HAS_PENDING_EXCEPTION) {
       CLEAR_PENDING_EXCEPTION;
       return JVMTI_ERROR_INTERNAL;
     };
     // Reset the deleted  ACC_SUPER bit ( deleted in compute_modifier_flags()).
     if(Klass::cast(k)->is_super()) {
       result |= JVM_ACC_SUPER;
     }
   } else {
     result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
   }
   *modifiers_ptr = result;
   return JVMTI_ERROR_NONE;
 } /* end GetClassModifiers */
 // k_mirror - may be primitive, this must be checked
 // method_count_ptr - pre-checked for NULL
 // methods_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
   JavaThread* current_thread  = JavaThread::current();
   HandleMark hm(current_thread);
   if (java_lang_Class::is_primitive(k_mirror)) {
     *method_count_ptr = 0;
     *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
     return JVMTI_ERROR_NONE;
   }
   klassOop k = java_lang_Class::as_klassOop(k_mirror);
   NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
   // Return CLASS_NOT_PREPARED error as per JVMTI spec.
   if (!(Klass::cast(k)->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
     return JVMTI_ERROR_CLASS_NOT_PREPARED;
   }
   if (!Klass::cast(k)->oop_is_instance()) {
     *method_count_ptr = 0;
     *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
     return JVMTI_ERROR_NONE;
   }
   instanceKlassHandle instanceK_h(current_thread, k);
   // Allocate the result and fill it in
   int result_length = instanceK_h->methods()->length();
   jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
   int index;
   if (JvmtiExport::can_maintain_original_method_order()) {
     // Use the original method ordering indices stored in the class, so we can emit
     // jmethodIDs in the order they appeared in the class file
     for (index = 0; index < result_length; index++) {
       methodOop m = methodOop(instanceK_h->methods()->obj_at(index));
       int original_index = instanceK_h->method_ordering()->int_at(index);
       assert(original_index >= 0 && original_index < result_length, "invalid original method index");
       jmethodID id = m->jmethod_id();
       result_list[original_index] = id;
     }
   } else {
     // otherwise just copy in any order
     for (index = 0; index < result_length; index++) {
       methodOop m = methodOop(instanceK_h->methods()->obj_at(index));
       jmethodID id = m->jmethod_id();
       result_list[index] = id;
     }
   }
   // Fill in return value.
   *method_count_ptr = result_length;
   *methods_ptr = result_list;
   return JVMTI_ERROR_NONE;
 } /* end GetClassMethods */
 // k_mirror - may be primitive, this must be checked
 // field_count_ptr - pre-checked for NULL
 // fields_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
   if (java_lang_Class::is_primitive(k_mirror)) {
     *field_count_ptr = 0;
     *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
     return JVMTI_ERROR_NONE;
   }
   JavaThread* current_thread = JavaThread::current();
   HandleMark hm(current_thread);
   klassOop k = java_lang_Class::as_klassOop(k_mirror);
   NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
   // Return CLASS_NOT_PREPARED error as per JVMTI spec.
   if (!(Klass::cast(k)->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
     return JVMTI_ERROR_CLASS_NOT_PREPARED;
   }
   if (!Klass::cast(k)->oop_is_instance()) {
     *field_count_ptr = 0;
     *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
     return JVMTI_ERROR_NONE;
   }
   instanceKlassHandle instanceK_h(current_thread, k);
   int result_count = 0;
   // First, count the fields.
   FilteredFieldStream flds(instanceK_h, true, true);
   result_count = flds.field_count();
   // Allocate the result and fill it in
   jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID));
   // The JVMTI spec requires fields in the order they occur in the class file,
   // this is the reverse order of what FieldStream hands out.
   int id_index = (result_count - 1);
   for (FilteredFieldStream src_st(instanceK_h, true, true); !src_st.eos(); src_st.next()) {
     result_list[id_index--] = jfieldIDWorkaround::to_jfieldID(
                                             instanceK_h, src_st.offset(),
                                             src_st.access_flags().is_static());
   }
   assert(id_index == -1, "just checking");
   // Fill in the results
   *field_count_ptr = result_count;
   *fields_ptr = result_list;
   return JVMTI_ERROR_NONE;
 } /* end GetClassFields */
 // k_mirror - may be primitive, this must be checked
 // interface_count_ptr - pre-checked for NULL
 // interfaces_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
   {
     if (java_lang_Class::is_primitive(k_mirror)) {
       *interface_count_ptr = 0;
       *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
       return JVMTI_ERROR_NONE;
     }
     JavaThread* current_thread = JavaThread::current();
     HandleMark hm(current_thread);
     klassOop k = java_lang_Class::as_klassOop(k_mirror);
     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
     // Return CLASS_NOT_PREPARED error as per JVMTI spec.
     if (!(Klass::cast(k)->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
       return JVMTI_ERROR_CLASS_NOT_PREPARED;
     if (!Klass::cast(k)->oop_is_instance()) {
       *interface_count_ptr = 0;
       *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
       return JVMTI_ERROR_NONE;
     }
     objArrayHandle interface_list(current_thread, instanceKlass::cast(k)->local_interfaces());
     const int result_length = (interface_list.is_null() ? 0 : interface_list->length());
     jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
     for (int i_index = 0; i_index < result_length; i_index += 1) {
       oop oop_at = interface_list->obj_at(i_index);
       assert(oop_at->is_klass(), "interfaces must be klassOops");
       klassOop klassOop_at = klassOop(oop_at);      // ???: is there a better way?
       assert(Klass::cast(klassOop_at)->is_interface(), "interfaces must be interfaces");
       oop mirror_at = Klass::cast(klassOop_at)->java_mirror();
       Handle handle_at = Handle(current_thread, mirror_at);
       result_list[i_index] = (jclass) jni_reference(handle_at);
     }
     *interface_count_ptr = result_length;
     *interfaces_ptr = result_list;
   }
   return JVMTI_ERROR_NONE;
 } /* end GetImplementedInterfaces */
 // k_mirror - may be primitive, this must be checked
 // minor_version_ptr - pre-checked for NULL
 // major_version_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
   if (java_lang_Class::is_primitive(k_mirror)) {
     return JVMTI_ERROR_ABSENT_INFORMATION;
   }
   klassOop k_oop = java_lang_Class::as_klassOop(k_mirror);
   Thread *thread = Thread::current();
   HandleMark hm(thread);
   KlassHandle klass(thread, k_oop);
   jint status = klass->jvmti_class_status();
   if (status & (JVMTI_CLASS_STATUS_ERROR)) {
     return JVMTI_ERROR_INVALID_CLASS;
   }
   if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
     return JVMTI_ERROR_ABSENT_INFORMATION;
   }
   instanceKlassHandle ik(thread, k_oop);
   *minor_version_ptr = ik->minor_version();
   *major_version_ptr = ik->major_version();
   return JVMTI_ERROR_NONE;
 } /* end GetClassVersionNumbers */
 // k_mirror - may be primitive, this must be checked
 // constant_pool_count_ptr - pre-checked for NULL
 // constant_pool_byte_count_ptr - pre-checked for NULL
 // constant_pool_bytes_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
   if (java_lang_Class::is_primitive(k_mirror)) {
     return JVMTI_ERROR_ABSENT_INFORMATION;
   }
   klassOop k_oop = java_lang_Class::as_klassOop(k_mirror);
   Thread *thread = Thread::current();
   HandleMark hm(thread);
   ResourceMark rm(thread);
   KlassHandle klass(thread, k_oop);
   jint status = klass->jvmti_class_status();
   if (status & (JVMTI_CLASS_STATUS_ERROR)) {
     return JVMTI_ERROR_INVALID_CLASS;
   }
   if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
     return JVMTI_ERROR_ABSENT_INFORMATION;
   }
   instanceKlassHandle ikh(thread, k_oop);
   constantPoolHandle  constants(thread, ikh->constants());
   ObjectLocker ol(constants, thread);    // lock constant pool while we query it
   JvmtiConstantPoolReconstituter reconstituter(ikh);
   if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
     return reconstituter.get_error();
   }
   unsigned char *cpool_bytes;
   int cpool_size = reconstituter.cpool_size();
   if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
     return reconstituter.get_error();
   }
   jvmtiError res = allocate(cpool_size, &cpool_bytes);
   if (res != JVMTI_ERROR_NONE) {
     return res;
   }
   reconstituter.copy_cpool_bytes(cpool_bytes);
   if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
     return reconstituter.get_error();
   }
   *constant_pool_count_ptr      = constants->length();
   *constant_pool_byte_count_ptr = cpool_size;
   *constant_pool_bytes_ptr      = cpool_bytes;
   return JVMTI_ERROR_NONE;
 } /* end GetConstantPool */
 // k_mirror - may be primitive, this must be checked
 // is_interface_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
   {
     bool result = false;
     if (!java_lang_Class::is_primitive(k_mirror)) {
       klassOop k = java_lang_Class::as_klassOop(k_mirror);
       if (k != NULL && Klass::cast(k)->is_interface()) {
         result = true;
       }
     }
     *is_interface_ptr = result;
   }
   return JVMTI_ERROR_NONE;
 } /* end IsInterface */
 // k_mirror - may be primitive, this must be checked
 // is_array_class_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
   {
     bool result = false;
     if (!java_lang_Class::is_primitive(k_mirror)) {
       klassOop k = java_lang_Class::as_klassOop(k_mirror);
       if (k != NULL && Klass::cast(k)->oop_is_array()) {
         result = true;
       }
     }
     *is_array_class_ptr = result;
   }
   return JVMTI_ERROR_NONE;
 } /* end IsArrayClass */
 // k_mirror - may be primitive, this must be checked
 // classloader_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
   {
     if (java_lang_Class::is_primitive(k_mirror)) {
       *classloader_ptr = (jclass) jni_reference(Handle());
       return JVMTI_ERROR_NONE;
     }
     JavaThread* current_thread = JavaThread::current();
     HandleMark hm(current_thread);
     klassOop k = java_lang_Class::as_klassOop(k_mirror);
     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
     oop result_oop = Klass::cast(k)->class_loader();
     if (result_oop == NULL) {
       *classloader_ptr = (jclass) jni_reference(Handle());
       return JVMTI_ERROR_NONE;
     }
     Handle result_handle = Handle(current_thread, result_oop);
     jclass result_jnihandle = (jclass) jni_reference(result_handle);
     *classloader_ptr = result_jnihandle;
   }
   return JVMTI_ERROR_NONE;
 } /* end GetClassLoader */
 // k_mirror - may be primitive, this must be checked
 // source_debug_extension_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
   {
     if (java_lang_Class::is_primitive(k_mirror)) {
       return JVMTI_ERROR_ABSENT_INFORMATION;
     }
     klassOop k = java_lang_Class::as_klassOop(k_mirror);
     NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
     if (!Klass::cast(k)->oop_is_instance()) {
       return JVMTI_ERROR_ABSENT_INFORMATION;
     }
     symbolOop sdeOop = instanceKlass::cast(k)->source_debug_extension();
     NULL_CHECK(sdeOop, JVMTI_ERROR_ABSENT_INFORMATION);
     {
       JavaThread* current_thread  = JavaThread::current();
       ResourceMark rm(current_thread);
       const char* sdecp = (const char*) sdeOop->as_C_string();
       *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sdecp)+1);
       strcpy(*source_debug_extension_ptr, sdecp);
     }
   }
   return JVMTI_ERROR_NONE;
 } /* end GetSourceDebugExtension */
   //
   // Object functions
   //
 // hash_code_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
   oop mirror = JNIHandles::resolve_external_guard(object);
   NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
   NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
   {
     jint result = (jint) mirror->identity_hash();
     *hash_code_ptr = result;
   }
   return JVMTI_ERROR_NONE;
 } /* end GetObjectHashCode */
 // info_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
   JavaThread* calling_thread = JavaThread::current();
   jvmtiError err = get_object_monitor_usage(calling_thread, object, info_ptr);
   if (err == JVMTI_ERROR_THREAD_NOT_SUSPENDED) {
     // Some of the critical threads were not suspended. go to a safepoint and try again
     VM_GetObjectMonitorUsage op(this, calling_thread, object, info_ptr);
     VMThread::execute(&op);
     err = op.result();
   }
   return err;
 } /* end GetObjectMonitorUsage */
   //
   // Field functions
   //
 // name_ptr - NULL is a valid value, must be checked
 // signature_ptr - NULL is a valid value, must be checked
 // generic_ptr - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
   JavaThread* current_thread  = JavaThread::current();
   ResourceMark rm(current_thread);
   if (name_ptr == NULL) {
     // just don't return the name
   } else {
     const char* fieldName = fdesc_ptr->name()->as_C_string();
     *name_ptr =  (char*) jvmtiMalloc(strlen(fieldName) + 1);
     if (*name_ptr == NULL)
       return JVMTI_ERROR_OUT_OF_MEMORY;
     strcpy(*name_ptr, fieldName);
   }
   if (signature_ptr== NULL) {
     // just don't return the signature
   } else {
     const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
     *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
     if (*signature_ptr == NULL)
       return JVMTI_ERROR_OUT_OF_MEMORY;
     strcpy(*signature_ptr, fieldSignature);
   }
   if (generic_ptr != NULL) {
     *generic_ptr = NULL;
     symbolOop soop = fdesc_ptr->generic_signature();
     if (soop != NULL) {
       const char* gen_sig = soop->as_C_string();
       if (gen_sig != NULL) {
         jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
         if (err != JVMTI_ERROR_NONE) {
           return err;
         }
         strcpy(*generic_ptr, gen_sig);
       }
     }
   }
   return JVMTI_ERROR_NONE;
 } /* end GetFieldName */
 // declaring_class_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
   *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
   return JVMTI_ERROR_NONE;
 } /* end GetFieldDeclaringClass */
 // modifiers_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
   AccessFlags resultFlags = fdesc_ptr->access_flags();
   jint result = resultFlags.as_int();
   *modifiers_ptr = result;
   return JVMTI_ERROR_NONE;
 } /* end GetFieldModifiers */
 // is_synthetic_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
   *is_synthetic_ptr = fdesc_ptr->is_synthetic();
   return JVMTI_ERROR_NONE;
 } /* end IsFieldSynthetic */
   //
   // Method functions
   //
 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
 // name_ptr - NULL is a valid value, must be checked
 // signature_ptr - NULL is a valid value, must be checked
 // generic_ptr - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::GetMethodName(methodOop method_oop, char** name_ptr, char** signature_ptr, char** generic_ptr) {
   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
   JavaThread* current_thread  = JavaThread::current();
   ResourceMark rm(current_thread); // get the utf8 name and signature
   if (name_ptr == NULL) {
     // just don't return the name
   } else {
     const char* utf8_name = (const char *) method_oop->name()->as_utf8();
     *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
     strcpy(*name_ptr, utf8_name);
   }
   if (signature_ptr == NULL) {
     // just don't return the signature
   } else {
     const char* utf8_signature = (const char *) method_oop->signature()->as_utf8();
     *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
     strcpy(*signature_ptr, utf8_signature);
   }
   if (generic_ptr != NULL) {
     *generic_ptr = NULL;
     symbolOop soop = method_oop->generic_signature();
     if (soop != NULL) {
       const char* gen_sig = soop->as_C_string();
       if (gen_sig != NULL) {
         jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
         if (err != JVMTI_ERROR_NONE) {
           return err;
         }
         strcpy(*generic_ptr, gen_sig);
       }
     }
   }
   return JVMTI_ERROR_NONE;
 } /* end GetMethodName */
 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
 // declaring_class_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetMethodDeclaringClass(methodOop method_oop, jclass* declaring_class_ptr) {
   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
   (*declaring_class_ptr) = get_jni_class_non_null(method_oop->method_holder());
   return JVMTI_ERROR_NONE;
 } /* end GetMethodDeclaringClass */
 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
 // modifiers_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetMethodModifiers(methodOop method_oop, jint* modifiers_ptr) {
   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
   (*modifiers_ptr) = method_oop->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
   return JVMTI_ERROR_NONE;
 } /* end GetMethodModifiers */
 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
 // max_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetMaxLocals(methodOop method_oop, jint* max_ptr) {
   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
   // get max stack
   (*max_ptr) = method_oop->max_locals();
   return JVMTI_ERROR_NONE;
 } /* end GetMaxLocals */
 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
 // size_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetArgumentsSize(methodOop method_oop, jint* size_ptr) {
   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
   // get size of arguments
   (*size_ptr) = method_oop->size_of_parameters();
   return JVMTI_ERROR_NONE;
 } /* end GetArgumentsSize */
 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
 // entry_count_ptr - pre-checked for NULL
 // table_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetLineNumberTable(methodOop method_oop, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
   if (!method_oop->has_linenumber_table()) {
     return (JVMTI_ERROR_ABSENT_INFORMATION);
   }
   // The line number table is compressed so we don't know how big it is until decompressed.
   // Decompression is really fast so we just do it twice.
   // Compute size of table
   jint num_entries = 0;
   CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table());
   while (stream.read_pair()) {
     num_entries++;
   }
   jvmtiLineNumberEntry *jvmti_table =
             (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
   // Fill jvmti table
   if (num_entries > 0) {
     int index = 0;
     CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table());
     while (stream.read_pair()) {
       jvmti_table[index].start_location = (jlocation) stream.bci();
       jvmti_table[index].line_number = (jint) stream.line();
       index++;
     }
     assert(index == num_entries, "sanity check");
   }
   // Set up results
   (*entry_count_ptr) = num_entries;
   (*table_ptr) = jvmti_table;
   return JVMTI_ERROR_NONE;
 } /* end GetLineNumberTable */
 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
 // start_location_ptr - pre-checked for NULL
 // end_location_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetMethodLocation(methodOop method_oop, jlocation* start_location_ptr, jlocation* end_location_ptr) {
   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
   // get start and end location
   (*end_location_ptr) = (jlocation) (method_oop->code_size() - 1);
   if (method_oop->code_size() == 0) {
     // there is no code so there is no start location
     (*start_location_ptr) = (jlocation)(-1);
   } else {
     (*start_location_ptr) = (jlocation)(0);
   }
   return JVMTI_ERROR_NONE;
 } /* end GetMethodLocation */
 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
 // entry_count_ptr - pre-checked for NULL
 // table_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetLocalVariableTable(methodOop method_oop, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
   JavaThread* current_thread  = JavaThread::current();
   // does the klass have any local variable information?
   instanceKlass* ik = instanceKlass::cast(method_oop->method_holder());
   if (!ik->access_flags().has_localvariable_table()) {
     return (JVMTI_ERROR_ABSENT_INFORMATION);
   }
   constantPoolOop constants = method_oop->constants();
   NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
   // in the vm localvariable table representation, 6 consecutive elements in the table
   // represent a 6-tuple of shorts
   // [start_pc, length, name_index, descriptor_index, signature_index, index]
   jint num_entries = method_oop->localvariable_table_length();
   jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
                 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
   if (num_entries > 0) {
     LocalVariableTableElement* table = method_oop->localvariable_table_start();
     for (int i = 0; i < num_entries; i++) {
       // get the 5 tuple information from the vm table
       jlocation start_location = (jlocation) table[i].start_bci;
       jint length = (jint) table[i].length;
       int name_index = (int) table[i].name_cp_index;
       int signature_index = (int) table[i].descriptor_cp_index;
       int generic_signature_index = (int) table[i].signature_cp_index;
       jint slot = (jint) table[i].slot;
       // get utf8 name and signature
       char *name_buf = NULL;
       char *sig_buf = NULL;
       char *gen_sig_buf = NULL;
       {
         ResourceMark rm(current_thread);
         const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
         name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
         strcpy(name_buf, utf8_name);
         const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
         sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
         strcpy(sig_buf, utf8_signature);
         if (generic_signature_index > 0) {
           const char *utf8_gen_sign = (const char *)
                                        constants->symbol_at(generic_signature_index)->as_utf8();
           gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
           strcpy(gen_sig_buf, utf8_gen_sign);
         }
       }
       // fill in the jvmti local variable table
       jvmti_table[i].start_location = start_location;
       jvmti_table[i].length = length;
       jvmti_table[i].name = name_buf;
       jvmti_table[i].signature = sig_buf;
       jvmti_table[i].generic_signature = gen_sig_buf;
       jvmti_table[i].slot = slot;
     }
   }
   // set results
   (*entry_count_ptr) = num_entries;
   (*table_ptr) = jvmti_table;
   return JVMTI_ERROR_NONE;
 } /* end GetLocalVariableTable */
 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
 // bytecode_count_ptr - pre-checked for NULL
 // bytecodes_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetBytecodes(methodOop method_oop, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
   HandleMark hm;
   methodHandle method(method_oop);
   jint size = (jint)method->code_size();
   jvmtiError err = allocate(size, bytecodes_ptr);
   if (err != JVMTI_ERROR_NONE) {
     return err;
   }
   (*bytecode_count_ptr) = size;
   // get byte codes
   JvmtiClassFileReconstituter::copy_bytecodes(method, *bytecodes_ptr);
   return JVMTI_ERROR_NONE;
 } /* end GetBytecodes */
 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
 // is_native_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::IsMethodNative(methodOop method_oop, jboolean* is_native_ptr) {
   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
   (*is_native_ptr) = method_oop->is_native();
   return JVMTI_ERROR_NONE;
 } /* end IsMethodNative */
 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
 // is_synthetic_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::IsMethodSynthetic(methodOop method_oop, jboolean* is_synthetic_ptr) {
   NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
   (*is_synthetic_ptr) = method_oop->is_synthetic();
   return JVMTI_ERROR_NONE;
 } /* end IsMethodSynthetic */
 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
 // is_obsolete_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::IsMethodObsolete(methodOop method_oop, jboolean* is_obsolete_ptr) {
   if (method_oop == NULL || method_oop->is_obsolete()) {
     *is_obsolete_ptr = true;
   } else {
     *is_obsolete_ptr = false;
   }
   return JVMTI_ERROR_NONE;
 } /* end IsMethodObsolete */
   //
   // Raw Monitor functions
   //
 // name - pre-checked for NULL
 // monitor_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
   JvmtiRawMonitor* rmonitor = new JvmtiRawMonitor(name);
   NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
   *monitor_ptr = (jrawMonitorID)rmonitor;
   return JVMTI_ERROR_NONE;
 } /* end CreateRawMonitor */
 // rmonitor - pre-checked for validity
 jvmtiError
 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
   if (Threads::number_of_threads() == 0) {
     // Remove this  monitor from pending raw monitors list
     // if it has entered in onload or start phase.
     JvmtiPendingMonitors::destroy(rmonitor);
   } else {
     Thread* thread  = Thread::current();
     if (rmonitor->is_entered(thread)) {
       // The caller owns this monitor which we are about to destroy.
       // We exit the underlying synchronization object so that the
       // "delete monitor" call below can work without an assertion
       // failure on systems that don't like destroying synchronization
       // objects that are locked.
       int r;
       intptr_t recursion = rmonitor->recursions();
       for (intptr_t i=0; i <= recursion; i++) {
         r = rmonitor->raw_exit(thread);
         assert(r == ObjectMonitor::OM_OK, "raw_exit should have worked");
         if (r != ObjectMonitor::OM_OK) {  // robustness
           return JVMTI_ERROR_INTERNAL;
         }
       }
     }
     if (rmonitor->owner() != NULL) {
       // The caller is trying to destroy a monitor that is locked by
       // someone else. While this is not forbidden by the JVMTI
       // spec, it will cause an assertion failure on systems that don't
       // like destroying synchronization objects that are locked.
       // We indicate a problem with the error return (and leak the
       // monitor's memory).
       return JVMTI_ERROR_NOT_MONITOR_OWNER;
     }
   }
   delete rmonitor;
   return JVMTI_ERROR_NONE;
 } /* end DestroyRawMonitor */
 // rmonitor - pre-checked for validity
 jvmtiError
 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
   if (Threads::number_of_threads() == 0) {
     // No JavaThreads exist so ObjectMonitor enter cannot be
     // used, add this raw monitor to the pending list.
     // The pending monitors will be actually entered when
     // the VM is setup.
     // See transition_pending_raw_monitors in create_vm()
     // in thread.cpp.
     JvmtiPendingMonitors::enter(rmonitor);
   } else {
     int r;
     Thread* thread = Thread::current();
     if (thread->is_Java_thread()) {
       JavaThread* current_thread = (JavaThread*)thread;
 #ifdef PROPER_TRANSITIONS
       // Not really unknown but ThreadInVMfromNative does more than we want
       ThreadInVMfromUnknown __tiv;
       {
         ThreadBlockInVM __tbivm(current_thread);
         r = rmonitor->raw_enter(current_thread);
       }
 #else
       /* Transition to thread_blocked without entering vm state          */
       /* This is really evil. Normally you can't undo _thread_blocked    */
       /* transitions like this because it would cause us to miss a       */
       /* safepoint but since the thread was already in _thread_in_native */
       /* the thread is not leaving a safepoint safe state and it will    */
       /* block when it tries to return from native. We can't safepoint   */
       /* block in here because we could deadlock the vmthread. Blech.    */
       JavaThreadState state = current_thread->thread_state();
       assert(state == _thread_in_native, "Must be _thread_in_native");
       // frame should already be walkable since we are in native
       assert(!current_thread->has_last_Java_frame() ||
              current_thread->frame_anchor()->walkable(), "Must be walkable");
       current_thread->set_thread_state(_thread_blocked);
       r = rmonitor->raw_enter(current_thread);
       // restore state, still at a safepoint safe state
       current_thread->set_thread_state(state);
 #endif /* PROPER_TRANSITIONS */
       assert(r == ObjectMonitor::OM_OK, "raw_enter should have worked");
     } else {
       if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
         r = rmonitor->raw_enter(thread);
       } else {
         ShouldNotReachHere();
       }
     }
     if (r != ObjectMonitor::OM_OK) {  // robustness
       return JVMTI_ERROR_INTERNAL;
     }
   }
   return JVMTI_ERROR_NONE;
 } /* end RawMonitorEnter */
 // rmonitor - pre-checked for validity
 jvmtiError
 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
   jvmtiError err = JVMTI_ERROR_NONE;
   if (Threads::number_of_threads() == 0) {
     // No JavaThreads exist so just remove this monitor from the pending list.
     // Bool value from exit is false if rmonitor is not in the list.
     if (!JvmtiPendingMonitors::exit(rmonitor)) {
       err = JVMTI_ERROR_NOT_MONITOR_OWNER;
     }
   } else {
     int r;
     Thread* thread = Thread::current();
     if (thread->is_Java_thread()) {
       JavaThread* current_thread = (JavaThread*)thread;
 #ifdef PROPER_TRANSITIONS
       // Not really unknown but ThreadInVMfromNative does more than we want
       ThreadInVMfromUnknown __tiv;
 #endif /* PROPER_TRANSITIONS */
       r = rmonitor->raw_exit(current_thread);
     } else {
       if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
         r = rmonitor->raw_exit(thread);
       } else {
         ShouldNotReachHere();
       }
     }
     if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) {
       err = JVMTI_ERROR_NOT_MONITOR_OWNER;
     } else {
       assert(r == ObjectMonitor::OM_OK, "raw_exit should have worked");
       if (r != ObjectMonitor::OM_OK) {  // robustness
         err = JVMTI_ERROR_INTERNAL;
       }
     }
   }
   return err;
 } /* end RawMonitorExit */
 // rmonitor - pre-checked for validity
 jvmtiError
 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
   int r;
   Thread* thread = Thread::current();
   if (thread->is_Java_thread()) {
     JavaThread* current_thread = (JavaThread*)thread;
 #ifdef PROPER_TRANSITIONS
     // Not really unknown but ThreadInVMfromNative does more than we want
     ThreadInVMfromUnknown __tiv;
     {
       ThreadBlockInVM __tbivm(current_thread);
       r = rmonitor->raw_wait(millis, true, current_thread);
     }
 #else
     /* Transition to thread_blocked without entering vm state          */
     /* This is really evil. Normally you can't undo _thread_blocked    */
     /* transitions like this because it would cause us to miss a       */
     /* safepoint but since the thread was already in _thread_in_native */
     /* the thread is not leaving a safepoint safe state and it will    */
     /* block when it tries to return from native. We can't safepoint   */
     /* block in here because we could deadlock the vmthread. Blech.    */
     JavaThreadState state = current_thread->thread_state();
     assert(state == _thread_in_native, "Must be _thread_in_native");
     // frame should already be walkable since we are in native
     assert(!current_thread->has_last_Java_frame() ||
            current_thread->frame_anchor()->walkable(), "Must be walkable");
     current_thread->set_thread_state(_thread_blocked);
     r = rmonitor->raw_wait(millis, true, current_thread);
     // restore state, still at a safepoint safe state
     current_thread->set_thread_state(state);
 #endif /* PROPER_TRANSITIONS */
   } else {
     if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
       r = rmonitor->raw_wait(millis, true, thread);
     } else {
       ShouldNotReachHere();
     }
   }
   switch (r) {
   case ObjectMonitor::OM_INTERRUPTED:
     return JVMTI_ERROR_INTERRUPT;
   case ObjectMonitor::OM_ILLEGAL_MONITOR_STATE:
     return JVMTI_ERROR_NOT_MONITOR_OWNER;
   }
   assert(r == ObjectMonitor::OM_OK, "raw_wait should have worked");
   if (r != ObjectMonitor::OM_OK) {  // robustness
     return JVMTI_ERROR_INTERNAL;
   }
   return JVMTI_ERROR_NONE;
 } /* end RawMonitorWait */
 // rmonitor - pre-checked for validity
 jvmtiError
 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
   int r;
   Thread* thread = Thread::current();
   if (thread->is_Java_thread()) {
     JavaThread* current_thread = (JavaThread*)thread;
     // Not really unknown but ThreadInVMfromNative does more than we want
     ThreadInVMfromUnknown __tiv;
     r = rmonitor->raw_notify(current_thread);
   } else {
     if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
       r = rmonitor->raw_notify(thread);
     } else {
       ShouldNotReachHere();
     }
   }
   if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) {
     return JVMTI_ERROR_NOT_MONITOR_OWNER;
   }
   assert(r == ObjectMonitor::OM_OK, "raw_notify should have worked");
   if (r != ObjectMonitor::OM_OK) {  // robustness
     return JVMTI_ERROR_INTERNAL;
   }
   return JVMTI_ERROR_NONE;
 } /* end RawMonitorNotify */
 // rmonitor - pre-checked for validity
 jvmtiError
 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
   int r;
   Thread* thread = Thread::current();
   if (thread->is_Java_thread()) {
     JavaThread* current_thread = (JavaThread*)thread;
     ThreadInVMfromUnknown __tiv;
     r = rmonitor->raw_notifyAll(current_thread);
   } else {
     if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
       r = rmonitor->raw_notifyAll(thread);
     } else {
       ShouldNotReachHere();
     }
   }
   if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) {
     return JVMTI_ERROR_NOT_MONITOR_OWNER;
   }
   assert(r == ObjectMonitor::OM_OK, "raw_notifyAll should have worked");
   if (r != ObjectMonitor::OM_OK) {  // robustness
     return JVMTI_ERROR_INTERNAL;
   }
   return JVMTI_ERROR_NONE;
 } /* end RawMonitorNotifyAll */
   //
   // JNI Function Interception functions
   //
 // function_table - pre-checked for NULL
 jvmtiError
 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
   // Copy jni function table at safepoint.
   VM_JNIFunctionTableCopier copier(function_table);
   VMThread::execute(&copier);
   return JVMTI_ERROR_NONE;
 } /* end SetJNIFunctionTable */
 // function_table - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
   *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
   if (*function_table == NULL)
     return JVMTI_ERROR_OUT_OF_MEMORY;
   memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
   return JVMTI_ERROR_NONE;
 } /* end GetJNIFunctionTable */
   //
   // Event Management functions
   //
 jvmtiError
 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
   // can only generate two event types
   if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
       event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
     return JVMTI_ERROR_ILLEGAL_ARGUMENT;
   }
   // for compiled_method_load events we must check that the environment
   // has the can_generate_compiled_method_load_events capability.
   if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
     if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
       return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
     }
     return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
   } else {
     return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
   }
 } /* end GenerateEvents */
   //
   // Extension Mechanism functions
   //
 // extension_count_ptr - pre-checked for NULL
 // extensions - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
   return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
 } /* end GetExtensionFunctions */
 // extension_count_ptr - pre-checked for NULL
 // extensions - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
   return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
 } /* end GetExtensionEvents */
 // callback - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
   return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
 } /* end SetExtensionEventCallback */
   //
   // Timers functions
   //
 // info_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
   os::current_thread_cpu_time_info(info_ptr);
   return JVMTI_ERROR_NONE;
 } /* end GetCurrentThreadCpuTimerInfo */
 // nanos_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
   *nanos_ptr = os::current_thread_cpu_time();
   return JVMTI_ERROR_NONE;
 } /* end GetCurrentThreadCpuTime */
 // info_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
   os::thread_cpu_time_info(info_ptr);
   return JVMTI_ERROR_NONE;
 } /* end GetThreadCpuTimerInfo */
 // Threads_lock NOT held, java_thread not protected by lock
 // java_thread - pre-checked
 // nanos_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetThreadCpuTime(JavaThread* java_thread, jlong* nanos_ptr) {
   *nanos_ptr = os::thread_cpu_time(java_thread);
   return JVMTI_ERROR_NONE;
 } /* end GetThreadCpuTime */
 // info_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
   os::javaTimeNanos_info(info_ptr);
   return JVMTI_ERROR_NONE;
 } /* end GetTimerInfo */
 // nanos_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetTime(jlong* nanos_ptr) {
   *nanos_ptr = os::javaTimeNanos();
   return JVMTI_ERROR_NONE;
 } /* end GetTime */
 // processor_count_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
   *processor_count_ptr = os::active_processor_count();
   return JVMTI_ERROR_NONE;
 } /* end GetAvailableProcessors */
   //
   // System Properties functions
   //
 // count_ptr - pre-checked for NULL
 // property_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
   jvmtiError err = JVMTI_ERROR_NONE;
   *count_ptr = Arguments::PropertyList_count(Arguments::system_properties());
   err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
   if (err != JVMTI_ERROR_NONE) {
     return err;
   }
   int i = 0 ;
   for (SystemProperty* p = Arguments::system_properties(); p != NULL && i < *count_ptr; p = p->next(), i++) {
     const char *key = p->key();
     char **tmp_value = *property_ptr+i;
     err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
     if (err == JVMTI_ERROR_NONE) {
       strcpy(*tmp_value, key);
     } else {
       // clean up previously allocated memory.
       for (int j=0; j<i; j++) {
         Deallocate((unsigned char*)*property_ptr+j);
       }
       Deallocate((unsigned char*)property_ptr);
       break;
     }
   }
   return err;
 } /* end GetSystemProperties */
 // property - pre-checked for NULL
 // value_ptr - pre-checked for NULL
 jvmtiError
 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
   jvmtiError err = JVMTI_ERROR_NONE;
   const char *value;
   value = Arguments::PropertyList_get_value(Arguments::system_properties(), property);
   if (value == NULL) {
     err =  JVMTI_ERROR_NOT_AVAILABLE;
   } else {
     err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
     if (err == JVMTI_ERROR_NONE) {
       strcpy(*value_ptr, value);
     }
   }
   return err;
 } /* end GetSystemProperty */
 // property - pre-checked for NULL
 // value - NULL is a valid value, must be checked
 jvmtiError
 JvmtiEnv::SetSystemProperty(const char* property, const char* value) {
   jvmtiError err =JVMTI_ERROR_NOT_AVAILABLE;
   for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
     if (strcmp(property, p->key()) == 0) {
       if (p->set_value((char *)value)) {
         err =  JVMTI_ERROR_NONE;
       }
     }
   }
   return err;
 } /* end SetSystemProperty */
 #endif // !JVMTI_KERNEL

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/prims/jvmtiEnv.cpp@2f716c0acb64 (annotated)

src/share/vm/prims/jvmtiEnv.cpp