Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * 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;