jdk8-mips64-public/hotspot: comparison src/share/vm/services/management.cpp

--1:000000000000
+:f90c822e73f8
+/*
+* Copyright (c) 2003, 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+* or visit www.oracle.com if you need additional information or have any
+* questions.
+*
+*/
+#include "precompiled.hpp"
+#include "classfile/systemDictionary.hpp"
+#include "compiler/compileBroker.hpp"
+#include "memory/iterator.hpp"
+#include "memory/oopFactory.hpp"
+#include "memory/resourceArea.hpp"
+#include "oops/klass.hpp"
+#include "oops/objArrayKlass.hpp"
+#include "oops/oop.inline.hpp"
+#include "runtime/arguments.hpp"
+#include "runtime/globals.hpp"
+#include "runtime/handles.inline.hpp"
+#include "runtime/interfaceSupport.hpp"
+#include "runtime/javaCalls.hpp"
+#include "runtime/jniHandles.hpp"
+#include "runtime/os.hpp"
+#include "runtime/serviceThread.hpp"
+#include "services/classLoadingService.hpp"
+#include "services/diagnosticCommand.hpp"
+#include "services/diagnosticFramework.hpp"
+#include "services/heapDumper.hpp"
+#include "services/jmm.h"
+#include "services/lowMemoryDetector.hpp"
+#include "services/gcNotifier.hpp"
+#include "services/nmtDCmd.hpp"
+#include "services/management.hpp"
+#include "services/memoryManager.hpp"
+#include "services/memoryPool.hpp"
+#include "services/memoryService.hpp"
+#include "services/runtimeService.hpp"
+#include "services/threadService.hpp"
+#include "utilities/macros.hpp"
+PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
+PerfVariable* Management::_begin_vm_creation_time = NULL;
+PerfVariable* Management::_end_vm_creation_time = NULL;
+PerfVariable* Management::_vm_init_done_time = NULL;
+Klass* Management::_sensor_klass = NULL;
+Klass* Management::_threadInfo_klass = NULL;
+Klass* Management::_memoryUsage_klass = NULL;
+Klass* Management::_memoryPoolMXBean_klass = NULL;
+Klass* Management::_memoryManagerMXBean_klass = NULL;
+Klass* Management::_garbageCollectorMXBean_klass = NULL;
+Klass* Management::_managementFactory_klass = NULL;
+Klass* Management::_garbageCollectorImpl_klass = NULL;
+Klass* Management::_gcInfo_klass = NULL;
+Klass* Management::_diagnosticCommandImpl_klass = NULL;
+Klass* Management::_managementFactoryHelper_klass = NULL;
+jmmOptionalSupport Management::_optional_support = {0};
+TimeStamp Management::_stamp;
+void management_init() {
+#if INCLUDE_MANAGEMENT
+Management::init();
+ThreadService::init();
+RuntimeService::init();
+ClassLoadingService::init();
+#else
+ThreadService::init();
+// Make sure the VM version is initialized
+// This is normally called by RuntimeService::init().
+// Since that is conditionalized out, we need to call it here.
+Abstract_VM_Version::initialize();
+#endif // INCLUDE_MANAGEMENT
+}
+#if INCLUDE_MANAGEMENT
+void Management::init() {
+EXCEPTION_MARK;
+// These counters are for java.lang.management API support.
+// They are created even if -XX:-UsePerfData is set and in
+// that case, they will be allocated on C heap.
+_begin_vm_creation_time =
+PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
+PerfData::U_None, CHECK);
+_end_vm_creation_time =
+PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
+PerfData::U_None, CHECK);
+_vm_init_done_time =
+PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
+PerfData::U_None, CHECK);
+// Initialize optional support
+_optional_support.isLowMemoryDetectionSupported = 1;
+_optional_support.isCompilationTimeMonitoringSupported = 1;
+_optional_support.isThreadContentionMonitoringSupported = 1;
+if (os::is_thread_cpu_time_supported()) {
+_optional_support.isCurrentThreadCpuTimeSupported = 1;
+_optional_support.isOtherThreadCpuTimeSupported = 1;
+} else {
+_optional_support.isCurrentThreadCpuTimeSupported = 0;
+_optional_support.isOtherThreadCpuTimeSupported = 0;
+}
+_optional_support.isBootClassPathSupported = 1;
+_optional_support.isObjectMonitorUsageSupported = 1;
+#if INCLUDE_SERVICES
+// This depends on the heap inspector
+_optional_support.isSynchronizerUsageSupported = 1;
+#endif // INCLUDE_SERVICES
+_optional_support.isThreadAllocatedMemorySupported = 1;
+_optional_support.isRemoteDiagnosticCommandsSupported = 1;
+// Registration of the diagnostic commands
+DCmdRegistrant::register_dcmds();
+DCmdRegistrant::register_dcmds_ext();
+uint32_t full_export = DCmd_Source_Internal | DCmd_Source_AttachAPI
+| DCmd_Source_MBean;
+DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(full_export, true, false));
+}
+void Management::initialize(TRAPS) {
+// Start the service thread
+ServiceThread::initialize();
+if (ManagementServer) {
+ResourceMark rm(THREAD);
+HandleMark hm(THREAD);
+// Load and initialize the sun.management.Agent class
+// invoke startAgent method to start the management server
+Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
+Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::sun_management_Agent(),
+loader,
+Handle(),
+true,
+CHECK);
+instanceKlassHandle ik (THREAD, k);
+JavaValue result(T_VOID);
+JavaCalls::call_static(&result,
+ik,
+vmSymbols::startAgent_name(),
+vmSymbols::void_method_signature(),
+CHECK);
+}
+}
+void Management::get_optional_support(jmmOptionalSupport* support) {
+memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
+}
+Klass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
+Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
+instanceKlassHandle ik (THREAD, k);
+if (ik->should_be_initialized()) {
+ik->initialize(CHECK_NULL);
+}
+// If these classes change to not be owned by the boot loader, they need
+// to be walked to keep their class loader alive in oops_do.
+assert(ik->class_loader() == NULL, "need to follow in oops_do");
+return ik();
+}
+void Management::record_vm_startup_time(jlong begin, jlong duration) {
+// if the performance counter is not initialized,
+// then vm initialization failed; simply return.
+if (_begin_vm_creation_time == NULL) return;
+_begin_vm_creation_time->set_value(begin);
+_end_vm_creation_time->set_value(begin + duration);
+PerfMemory::set_accessible(true);
+}
+jlong Management::timestamp() {
+TimeStamp t;
+t.update();
+return t.ticks() - _stamp.ticks();
+}
+void Management::oops_do(OopClosure* f) {
+MemoryService::oops_do(f);
+ThreadService::oops_do(f);
+}
+Klass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {
+if (_threadInfo_klass == NULL) {
+_threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
+}
+return _threadInfo_klass;
+}
+Klass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {
+if (_memoryUsage_klass == NULL) {
+_memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
+}
+return _memoryUsage_klass;
+}
+Klass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
+if (_memoryPoolMXBean_klass == NULL) {
+_memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
+}
+return _memoryPoolMXBean_klass;
+}
+Klass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
+if (_memoryManagerMXBean_klass == NULL) {
+_memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
+}
+return _memoryManagerMXBean_klass;
+}
+Klass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
+if (_garbageCollectorMXBean_klass == NULL) {
+_garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
+}
+return _garbageCollectorMXBean_klass;
+}
+Klass* Management::sun_management_Sensor_klass(TRAPS) {
+if (_sensor_klass == NULL) {
+_sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
+}
+return _sensor_klass;
+}
+Klass* Management::sun_management_ManagementFactory_klass(TRAPS) {
+if (_managementFactory_klass == NULL) {
+_managementFactory_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactory(), CHECK_NULL);
+}
+return _managementFactory_klass;
+}
+Klass* Management::sun_management_GarbageCollectorImpl_klass(TRAPS) {
+if (_garbageCollectorImpl_klass == NULL) {
+_garbageCollectorImpl_klass = load_and_initialize_klass(vmSymbols::sun_management_GarbageCollectorImpl(), CHECK_NULL);
+}
+return _garbageCollectorImpl_klass;
+}
+Klass* Management::com_sun_management_GcInfo_klass(TRAPS) {
+if (_gcInfo_klass == NULL) {
+_gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
+}
+return _gcInfo_klass;
+}
+Klass* Management::sun_management_DiagnosticCommandImpl_klass(TRAPS) {
+if (_diagnosticCommandImpl_klass == NULL) {
+_diagnosticCommandImpl_klass = load_and_initialize_klass(vmSymbols::sun_management_DiagnosticCommandImpl(), CHECK_NULL);
+}
+return _diagnosticCommandImpl_klass;
+}
+Klass* Management::sun_management_ManagementFactoryHelper_klass(TRAPS) {
+if (_managementFactoryHelper_klass == NULL) {
+_managementFactoryHelper_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactoryHelper(), CHECK_NULL);
+}
+return _managementFactoryHelper_klass;
+}
+static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
+Handle snapshot_thread(THREAD, snapshot->threadObj());
+jlong contended_time;
+jlong waited_time;
+if (ThreadService::is_thread_monitoring_contention()) {
+contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
+waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
+} else {
+// set them to -1 if thread contention monitoring is disabled.
+contended_time = max_julong;
+waited_time = max_julong;
+}
+int thread_status = snapshot->thread_status();
+assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
+if (snapshot->is_ext_suspended()) {
+thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
+}
+if (snapshot->is_in_native()) {
+thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
+}
+ThreadStackTrace* st = snapshot->get_stack_trace();
+Handle stacktrace_h;
+if (st != NULL) {
+stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
+} else {
+stacktrace_h = Handle();
+}
+args->push_oop(snapshot_thread);
+args->push_int(thread_status);
+args->push_oop(Handle(THREAD, snapshot->blocker_object()));
+args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
+args->push_long(snapshot->contended_enter_count());
+args->push_long(contended_time);
+args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
+args->push_long(waited_time);
+args->push_oop(stacktrace_h);
+}
+// Helper function to construct a ThreadInfo object
+instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
+Klass* k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
+instanceKlassHandle ik (THREAD, k);
+JavaValue result(T_VOID);
+JavaCallArguments args(14);
+// First allocate a ThreadObj object and
+// push the receiver as the first argument
+Handle element = ik->allocate_instance_handle(CHECK_NULL);
+args.push_oop(element);
+// initialize the arguments for the ThreadInfo constructor
+initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
+// Call ThreadInfo constructor with no locked monitors and synchronizers
+JavaCalls::call_special(&result,
+ik,
+vmSymbols::object_initializer_name(),
+vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
+&args,
+CHECK_NULL);
+return (instanceOop) element();
+}
+instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
+objArrayHandle monitors_array,
+typeArrayHandle depths_array,
+objArrayHandle synchronizers_array,
+TRAPS) {
+Klass* k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
+instanceKlassHandle ik (THREAD, k);
+JavaValue result(T_VOID);
+JavaCallArguments args(17);
+// First allocate a ThreadObj object and
+// push the receiver as the first argument
+Handle element = ik->allocate_instance_handle(CHECK_NULL);
+args.push_oop(element);
+// initialize the arguments for the ThreadInfo constructor
+initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
+// push the locked monitors and synchronizers in the arguments
+args.push_oop(monitors_array);
+args.push_oop(depths_array);
+args.push_oop(synchronizers_array);
+// Call ThreadInfo constructor with locked monitors and synchronizers
+JavaCalls::call_special(&result,
+ik,
+vmSymbols::object_initializer_name(),
+vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
+&args,
+CHECK_NULL);
+return (instanceOop) element();
+}
+// Helper functions
+static JavaThread* find_java_thread_from_id(jlong thread_id) {
+assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
+JavaThread* java_thread = NULL;
+// Sequential search for now.  Need to do better optimization later.
+for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
+oop tobj = thread->threadObj();
+if (!thread->is_exiting() &&
+tobj != NULL &&
+thread_id == java_lang_Thread::thread_id(tobj)) {
+java_thread = thread;
+break;
+}
+}
+return java_thread;
+}
+static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
+if (mgr == NULL) {
+THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
+}
+oop mgr_obj = JNIHandles::resolve(mgr);
+instanceHandle h(THREAD, (instanceOop) mgr_obj);
+Klass* k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
+if (!h->is_a(k)) {
+THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
+"the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
+NULL);
+}
+MemoryManager* gc = MemoryService::get_memory_manager(h);
+if (gc == NULL || !gc->is_gc_memory_manager()) {
+THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
+"Invalid GC memory manager",
+NULL);
+}
+return (GCMemoryManager*) gc;
+}
+static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
+if (obj == NULL) {
+THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
+}
+oop pool_obj = JNIHandles::resolve(obj);
+assert(pool_obj->is_instance(), "Should be an instanceOop");
+instanceHandle ph(THREAD, (instanceOop) pool_obj);
+return MemoryService::get_memory_pool(ph);
+}
+static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
+int num_threads = ids_ah->length();
+// Validate input thread IDs
+int i = 0;
+for (i = 0; i < num_threads; i++) {
+jlong tid = ids_ah->long_at(i);
+if (tid <= 0) {
+// throw exception if invalid thread id.
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
+"Invalid thread ID entry");
+}
+}
+}
+static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
+// check if the element of infoArray is of type ThreadInfo class
+Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
+Klass* element_klass = ObjArrayKlass::cast(infoArray_h->klass())->element_klass();
+if (element_klass != threadinfo_klass) {
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
+"infoArray element type is not ThreadInfo class");
+}
+}
+static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
+if (obj == NULL) {
+THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
+}
+oop mgr_obj = JNIHandles::resolve(obj);
+assert(mgr_obj->is_instance(), "Should be an instanceOop");
+instanceHandle mh(THREAD, (instanceOop) mgr_obj);
+return MemoryService::get_memory_manager(mh);
+}
+// Returns a version string and sets major and minor version if
+// the input parameters are non-null.
+JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
+return JMM_VERSION;
+JVM_END
+// Gets the list of VM monitoring and management optional supports
+// Returns 0 if succeeded; otherwise returns non-zero.
+JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
+if (support == NULL) {
+return -1;
+}
+Management::get_optional_support(support);
+return 0;
+JVM_END
+// Returns a java.lang.String object containing the input arguments to the VM.
+JVM_ENTRY(jobject, jmm_GetInputArguments(JNIEnv *env))
+ResourceMark rm(THREAD);
+if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
+return NULL;
+}
+char** vm_flags = Arguments::jvm_flags_array();
+char** vm_args  = Arguments::jvm_args_array();
+int num_flags   = Arguments::num_jvm_flags();
+int num_args    = Arguments::num_jvm_args();
+size_t length = 1; // null terminator
+int i;
+for (i = 0; i < num_flags; i++) {
+length += strlen(vm_flags[i]);
+}
+for (i = 0; i < num_args; i++) {
+length += strlen(vm_args[i]);
+}
+// add a space between each argument
+length += num_flags + num_args - 1;
+// Return the list of input arguments passed to the VM
+// and preserve the order that the VM processes.
+char* args = NEW_RESOURCE_ARRAY(char, length);
+args[0] = '\0';
+// concatenate all jvm_flags
+if (num_flags > 0) {
+strcat(args, vm_flags[0]);
+for (i = 1; i < num_flags; i++) {
+strcat(args, " ");
+strcat(args, vm_flags[i]);
+}
+}
+if (num_args > 0 && num_flags > 0) {
+// append a space if args already contains one or more jvm_flags
+strcat(args, " ");
+}
+// concatenate all jvm_args
+if (num_args > 0) {
+strcat(args, vm_args[0]);
+for (i = 1; i < num_args; i++) {
+strcat(args, " ");
+strcat(args, vm_args[i]);
+}
+}
+Handle hargs = java_lang_String::create_from_platform_dependent_str(args, CHECK_NULL);
+return JNIHandles::make_local(env, hargs());
+JVM_END
+// Returns an array of java.lang.String object containing the input arguments to the VM.
+JVM_ENTRY(jobjectArray, jmm_GetInputArgumentArray(JNIEnv *env))
+ResourceMark rm(THREAD);
+if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
+return NULL;
+}
+char** vm_flags = Arguments::jvm_flags_array();
+char** vm_args = Arguments::jvm_args_array();
+int num_flags = Arguments::num_jvm_flags();
+int num_args = Arguments::num_jvm_args();
+instanceKlassHandle ik (THREAD, SystemDictionary::String_klass());
+objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL);
+objArrayHandle result_h(THREAD, r);
+int index = 0;
+for (int j = 0; j < num_flags; j++, index++) {
+Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
+result_h->obj_at_put(index, h());
+}
+for (int i = 0; i < num_args; i++, index++) {
+Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
+result_h->obj_at_put(index, h());
+}
+return (jobjectArray) JNIHandles::make_local(env, result_h());
+JVM_END
+// Returns an array of java/lang/management/MemoryPoolMXBean object
+// one for each memory pool if obj == null; otherwise returns
+// an array of memory pools for a given memory manager if
+// it is a valid memory manager.
+JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
+ResourceMark rm(THREAD);
+int num_memory_pools;
+MemoryManager* mgr = NULL;
+if (obj == NULL) {
+num_memory_pools = MemoryService::num_memory_pools();
+} else {
+mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
+if (mgr == NULL) {
+return NULL;
+}
+num_memory_pools = mgr->num_memory_pools();
+}
+// Allocate the resulting MemoryPoolMXBean[] object
+Klass* k = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
+instanceKlassHandle ik (THREAD, k);
+objArrayOop r = oopFactory::new_objArray(ik(), num_memory_pools, CHECK_NULL);
+objArrayHandle poolArray(THREAD, r);
+if (mgr == NULL) {
+// Get all memory pools
+for (int i = 0; i < num_memory_pools; i++) {
+MemoryPool* pool = MemoryService::get_memory_pool(i);
+instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
+instanceHandle ph(THREAD, p);
+poolArray->obj_at_put(i, ph());
+}
+} else {
+// Get memory pools managed by a given memory manager
+for (int i = 0; i < num_memory_pools; i++) {
+MemoryPool* pool = mgr->get_memory_pool(i);
+instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
+instanceHandle ph(THREAD, p);
+poolArray->obj_at_put(i, ph());
+}
+}
+return (jobjectArray) JNIHandles::make_local(env, poolArray());
+JVM_END
+// Returns an array of java/lang/management/MemoryManagerMXBean object
+// one for each memory manager if obj == null; otherwise returns
+// an array of memory managers for a given memory pool if
+// it is a valid memory pool.
+JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
+ResourceMark rm(THREAD);
+int num_mgrs;
+MemoryPool* pool = NULL;
+if (obj == NULL) {
+num_mgrs = MemoryService::num_memory_managers();
+} else {
+pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
+if (pool == NULL) {
+return NULL;
+}
+num_mgrs = pool->num_memory_managers();
+}
+// Allocate the resulting MemoryManagerMXBean[] object
+Klass* k = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
+instanceKlassHandle ik (THREAD, k);
+objArrayOop r = oopFactory::new_objArray(ik(), num_mgrs, CHECK_NULL);
+objArrayHandle mgrArray(THREAD, r);
+if (pool == NULL) {
+// Get all memory managers
+for (int i = 0; i < num_mgrs; i++) {
+MemoryManager* mgr = MemoryService::get_memory_manager(i);
+instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
+instanceHandle ph(THREAD, p);
+mgrArray->obj_at_put(i, ph());
+}
+} else {
+// Get memory managers for a given memory pool
+for (int i = 0; i < num_mgrs; i++) {
+MemoryManager* mgr = pool->get_memory_manager(i);
+instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
+instanceHandle ph(THREAD, p);
+mgrArray->obj_at_put(i, ph());
+}
+}
+return (jobjectArray) JNIHandles::make_local(env, mgrArray());
+JVM_END
+// Returns a java/lang/management/MemoryUsage object containing the memory usage
+// of a given memory pool.
+JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
+ResourceMark rm(THREAD);
+MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
+if (pool != NULL) {
+MemoryUsage usage = pool->get_memory_usage();
+Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
+return JNIHandles::make_local(env, h());
+} else {
+return NULL;
+}
+JVM_END
+// Returns a java/lang/management/MemoryUsage object containing the memory usage
+// of a given memory pool.
+JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
+ResourceMark rm(THREAD);
+MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
+if (pool != NULL) {
+MemoryUsage usage = pool->get_peak_memory_usage();
+Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
+return JNIHandles::make_local(env, h());
+} else {
+return NULL;
+}
+JVM_END
+// Returns a java/lang/management/MemoryUsage object containing the memory usage
+// of a given memory pool after most recent GC.
+JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
+ResourceMark rm(THREAD);
+MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
+if (pool != NULL && pool->is_collected_pool()) {
+MemoryUsage usage = pool->get_last_collection_usage();
+Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
+return JNIHandles::make_local(env, h());
+} else {
+return NULL;
+}
+JVM_END
+// Sets the memory pool sensor for a threshold type
+JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
+if (obj == NULL || sensorObj == NULL) {
+THROW(vmSymbols::java_lang_NullPointerException());
+}
+Klass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
+oop s = JNIHandles::resolve(sensorObj);
+assert(s->is_instance(), "Sensor should be an instanceOop");
+instanceHandle sensor_h(THREAD, (instanceOop) s);
+if (!sensor_h->is_a(sensor_klass)) {
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
+"Sensor is not an instance of sun.management.Sensor class");
+}
+MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
+assert(mpool != NULL, "MemoryPool should exist");
+switch (type) {
+case JMM_USAGE_THRESHOLD_HIGH:
+case JMM_USAGE_THRESHOLD_LOW:
+// have only one sensor for threshold high and low
+mpool->set_usage_sensor_obj(sensor_h);
+break;
+case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
+case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
+// have only one sensor for threshold high and low
+mpool->set_gc_usage_sensor_obj(sensor_h);
+break;
+default:
+assert(false, "Unrecognized type");
+}
+JVM_END
+// Sets the threshold of a given memory pool.
+// Returns the previous threshold.
+//
+// Input parameters:
+//   pool      - the MemoryPoolMXBean object
+//   type      - threshold type
+//   threshold - the new threshold (must not be negative)
+//
+JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
+if (threshold < 0) {
+THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
+"Invalid threshold value",
+-1);
+}
+if ((size_t)threshold > max_uintx) {
+stringStream st;
+st.print("Invalid valid threshold value. Threshold value (" UINT64_FORMAT ") > max value of size_t (" SIZE_FORMAT ")", (size_t)threshold, max_uintx);
+THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
+}
+MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
+assert(pool != NULL, "MemoryPool should exist");
+jlong prev = 0;
+switch (type) {
+case JMM_USAGE_THRESHOLD_HIGH:
+if (!pool->usage_threshold()->is_high_threshold_supported()) {
+return -1;
+}
+prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
+break;
+case JMM_USAGE_THRESHOLD_LOW:
+if (!pool->usage_threshold()->is_low_threshold_supported()) {
+return -1;
+}
+prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
+break;
+case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
+if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
+return -1;
+}
+// return and the new threshold is effective for the next GC
+return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
+case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
+if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
+return -1;
+}
+// return and the new threshold is effective for the next GC
+return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
+default:
+assert(false, "Unrecognized type");
+return -1;
+}
+// When the threshold is changed, reevaluate if the low memory
+// detection is enabled.
+if (prev != threshold) {
+LowMemoryDetector::recompute_enabled_for_collected_pools();
+LowMemoryDetector::detect_low_memory(pool);
+}
+return prev;
+JVM_END
+// Gets an array containing the amount of memory allocated on the Java
+// heap for a set of threads (in bytes).  Each element of the array is
+// the amount of memory allocated for the thread ID specified in the
+// corresponding entry in the given array of thread IDs; or -1 if the
+// thread does not exist or has terminated.
+JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
+jlongArray sizeArray))
+// Check if threads is null
+if (ids == NULL || sizeArray == NULL) {
+THROW(vmSymbols::java_lang_NullPointerException());
+}
+ResourceMark rm(THREAD);
+typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
+typeArrayHandle ids_ah(THREAD, ta);
+typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
+typeArrayHandle sizeArray_h(THREAD, sa);
+// validate the thread id array
+validate_thread_id_array(ids_ah, CHECK);
+// sizeArray must be of the same length as the given array of thread IDs
+int num_threads = ids_ah->length();
+if (num_threads != sizeArray_h->length()) {
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
+"The length of the given long array does not match the length of "
+"the given array of thread IDs");
+}
+MutexLockerEx ml(Threads_lock);
+for (int i = 0; i < num_threads; i++) {
+JavaThread* java_thread = find_java_thread_from_id(ids_ah->long_at(i));
+if (java_thread != NULL) {
+sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
+}
+}
+JVM_END
+// Returns a java/lang/management/MemoryUsage object representing
+// the memory usage for the heap or non-heap memory.
+JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
+ResourceMark rm(THREAD);
+// Calculate the memory usage
+size_t total_init = 0;
+size_t total_used = 0;
+size_t total_committed = 0;
+size_t total_max = 0;
+bool   has_undefined_init_size = false;
+bool   has_undefined_max_size = false;
+for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
+MemoryPool* pool = MemoryService::get_memory_pool(i);
+if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
+MemoryUsage u = pool->get_memory_usage();
+total_used += u.used();
+total_committed += u.committed();
+if (u.init_size() == (size_t)-1) {
+has_undefined_init_size = true;
+}
+if (!has_undefined_init_size) {
+total_init += u.init_size();
+}
+if (u.max_size() == (size_t)-1) {
+has_undefined_max_size = true;
+}
+if (!has_undefined_max_size) {
+total_max += u.max_size();
+}
+}
+}
+// if any one of the memory pool has undefined init_size or max_size,
+// set it to -1
+if (has_undefined_init_size) {
+total_init = (size_t)-1;
+}
+if (has_undefined_max_size) {
+total_max = (size_t)-1;
+}
+MemoryUsage usage((heap ? InitialHeapSize : total_init),
+total_used,
+total_committed,
+(heap ? Universe::heap()->max_capacity() : total_max));
+Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
+return JNIHandles::make_local(env, obj());
+JVM_END
+// Returns the boolean value of a given attribute.
+JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
+switch (att) {
+case JMM_VERBOSE_GC:
+return MemoryService::get_verbose();
+case JMM_VERBOSE_CLASS:
+return ClassLoadingService::get_verbose();
+case JMM_THREAD_CONTENTION_MONITORING:
+return ThreadService::is_thread_monitoring_contention();
+case JMM_THREAD_CPU_TIME:
+return ThreadService::is_thread_cpu_time_enabled();
+case JMM_THREAD_ALLOCATED_MEMORY:
+return ThreadService::is_thread_allocated_memory_enabled();
+default:
+assert(0, "Unrecognized attribute");
+return false;
+}
+JVM_END
+// Sets the given boolean attribute and returns the previous value.
+JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
+switch (att) {
+case JMM_VERBOSE_GC:
+return MemoryService::set_verbose(flag != 0);
+case JMM_VERBOSE_CLASS:
+return ClassLoadingService::set_verbose(flag != 0);
+case JMM_THREAD_CONTENTION_MONITORING:
+return ThreadService::set_thread_monitoring_contention(flag != 0);
+case JMM_THREAD_CPU_TIME:
+return ThreadService::set_thread_cpu_time_enabled(flag != 0);
+case JMM_THREAD_ALLOCATED_MEMORY:
+return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
+default:
+assert(0, "Unrecognized attribute");
+return false;
+}
+JVM_END
+static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
+switch (att) {
+case JMM_GC_TIME_MS:
+return mgr->gc_time_ms();
+case JMM_GC_COUNT:
+return mgr->gc_count();
+case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
+// current implementation only has 1 ext attribute
+return 1;
+default:
+assert(0, "Unrecognized GC attribute");
+return -1;
+}
+}
+class VmThreadCountClosure: public ThreadClosure {
+private:
+int _count;
+public:
+VmThreadCountClosure() : _count(0) {};
+void do_thread(Thread* thread);
+int count() { return _count; }
+};
+void VmThreadCountClosure::do_thread(Thread* thread) {
+// exclude externally visible JavaThreads
+if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
+return;
+}
+_count++;
+}
+static jint get_vm_thread_count() {
+VmThreadCountClosure vmtcc;
+{
+MutexLockerEx ml(Threads_lock);
+Threads::threads_do(&vmtcc);
+}
+return vmtcc.count();
+}
+static jint get_num_flags() {
+// last flag entry is always NULL, so subtract 1
+int nFlags = (int) Flag::numFlags - 1;
+int count = 0;
+for (int i = 0; i < nFlags; i++) {
+Flag* flag = &Flag::flags[i];
+// Exclude the locked (diagnostic, experimental) flags
+if (flag->is_unlocked() || flag->is_unlocker()) {
+count++;
+}
+}
+return count;
+}
+static jlong get_long_attribute(jmmLongAttribute att) {
+switch (att) {
+case JMM_CLASS_LOADED_COUNT:
+return ClassLoadingService::loaded_class_count();
+case JMM_CLASS_UNLOADED_COUNT:
+return ClassLoadingService::unloaded_class_count();
+case JMM_THREAD_TOTAL_COUNT:
+return ThreadService::get_total_thread_count();
+case JMM_THREAD_LIVE_COUNT:
+return ThreadService::get_live_thread_count();
+case JMM_THREAD_PEAK_COUNT:
+return ThreadService::get_peak_thread_count();
+case JMM_THREAD_DAEMON_COUNT:
+return ThreadService::get_daemon_thread_count();
+case JMM_JVM_INIT_DONE_TIME_MS:
+return Management::vm_init_done_time();
+case JMM_JVM_UPTIME_MS:
+return Management::ticks_to_ms(os::elapsed_counter());
+case JMM_COMPILE_TOTAL_TIME_MS:
+return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
+case JMM_OS_PROCESS_ID:
+return os::current_process_id();
+// Hotspot-specific counters
+case JMM_CLASS_LOADED_BYTES:
+return ClassLoadingService::loaded_class_bytes();
+case JMM_CLASS_UNLOADED_BYTES:
+return ClassLoadingService::unloaded_class_bytes();
+case JMM_SHARED_CLASS_LOADED_COUNT:
+return ClassLoadingService::loaded_shared_class_count();
+case JMM_SHARED_CLASS_UNLOADED_COUNT:
+return ClassLoadingService::unloaded_shared_class_count();
+case JMM_SHARED_CLASS_LOADED_BYTES:
+return ClassLoadingService::loaded_shared_class_bytes();
+case JMM_SHARED_CLASS_UNLOADED_BYTES:
+return ClassLoadingService::unloaded_shared_class_bytes();
+case JMM_TOTAL_CLASSLOAD_TIME_MS:
+return ClassLoader::classloader_time_ms();
+case JMM_VM_GLOBAL_COUNT:
+return get_num_flags();
+case JMM_SAFEPOINT_COUNT:
+return RuntimeService::safepoint_count();
+case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
+return RuntimeService::safepoint_sync_time_ms();
+case JMM_TOTAL_STOPPED_TIME_MS:
+return RuntimeService::safepoint_time_ms();
+case JMM_TOTAL_APP_TIME_MS:
+return RuntimeService::application_time_ms();
+case JMM_VM_THREAD_COUNT:
+return get_vm_thread_count();
+case JMM_CLASS_INIT_TOTAL_COUNT:
+return ClassLoader::class_init_count();
+case JMM_CLASS_INIT_TOTAL_TIME_MS:
+return ClassLoader::class_init_time_ms();
+case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
+return ClassLoader::class_verify_time_ms();
+case JMM_METHOD_DATA_SIZE_BYTES:
+return ClassLoadingService::class_method_data_size();
+case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
+return os::physical_memory();
+default:
+return -1;
+}
+}
+// Returns the long value of a given attribute.
+JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
+if (obj == NULL) {
+return get_long_attribute(att);
+} else {
+GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
+if (mgr != NULL) {
+return get_gc_attribute(mgr, att);
+}
+}
+return -1;
+JVM_END
+// Gets the value of all attributes specified in the given array
+// and sets the value in the result array.
+// Returns the number of attributes found.
+JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
+jobject obj,
+jmmLongAttribute* atts,
+jint count,
+jlong* result))
+int num_atts = 0;
+if (obj == NULL) {
+for (int i = 0; i < count; i++) {
+result[i] = get_long_attribute(atts[i]);
+if (result[i] != -1) {
+num_atts++;
+}
+}
+} else {
+GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
+for (int i = 0; i < count; i++) {
+result[i] = get_gc_attribute(mgr, atts[i]);
+if (result[i] != -1) {
+num_atts++;
+}
+}
+}
+return num_atts;
+JVM_END
+// Helper function to do thread dump for a specific list of threads
+static void do_thread_dump(ThreadDumpResult* dump_result,
+typeArrayHandle ids_ah,  // array of thread ID (long[])
+int num_threads,
+int max_depth,
+bool with_locked_monitors,
+bool with_locked_synchronizers,
+TRAPS) {
+// First get an array of threadObj handles.
+// A JavaThread may terminate before we get the stack trace.
+GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
+{
+MutexLockerEx ml(Threads_lock);
+for (int i = 0; i < num_threads; i++) {
+jlong tid = ids_ah->long_at(i);
+JavaThread* jt = find_java_thread_from_id(tid);
+oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
+instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
+thread_handle_array->append(threadObj_h);
+}
+}
+// Obtain thread dumps and thread snapshot information
+VM_ThreadDump op(dump_result,
+thread_handle_array,
+num_threads,
+max_depth, /* stack depth */
+with_locked_monitors,
+with_locked_synchronizers);
+VMThread::execute(&op);
+}
+// Gets an array of ThreadInfo objects. Each element is the ThreadInfo
+// for the thread ID specified in the corresponding entry in
+// the given array of thread IDs; or NULL if the thread does not exist
+// or has terminated.
+//
+// Input parameters:
+//   ids       - array of thread IDs
+//   maxDepth  - the maximum depth of stack traces to be dumped:
+//               maxDepth == -1 requests to dump entire stack trace.
+//               maxDepth == 0  requests no stack trace.
+//   infoArray - array of ThreadInfo objects
+//
+// QQQ - Why does this method return a value instead of void?
+JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
+// Check if threads is null
+if (ids == NULL || infoArray == NULL) {
+THROW_(vmSymbols::java_lang_NullPointerException(), -1);
+}
+if (maxDepth < -1) {
+THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
+"Invalid maxDepth", -1);
+}
+ResourceMark rm(THREAD);
+typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
+typeArrayHandle ids_ah(THREAD, ta);
+oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
+objArrayOop oa = objArrayOop(infoArray_obj);
+objArrayHandle infoArray_h(THREAD, oa);
+// validate the thread id array
+validate_thread_id_array(ids_ah, CHECK_0);
+// validate the ThreadInfo[] parameters
+validate_thread_info_array(infoArray_h, CHECK_0);
+// infoArray must be of the same length as the given array of thread IDs
+int num_threads = ids_ah->length();
+if (num_threads != infoArray_h->length()) {
+THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
+"The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
+}
+if (JDK_Version::is_gte_jdk16x_version()) {
+// make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
+java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
+}
+// Must use ThreadDumpResult to store the ThreadSnapshot.
+// GC may occur after the thread snapshots are taken but before
+// this function returns. The threadObj and other oops kept
+// in the ThreadSnapshot are marked and adjusted during GC.
+ThreadDumpResult dump_result(num_threads);
+if (maxDepth == 0) {
+// no stack trace dumped - do not need to stop the world
+{
+MutexLockerEx ml(Threads_lock);
+for (int i = 0; i < num_threads; i++) {
+jlong tid = ids_ah->long_at(i);
+JavaThread* jt = find_java_thread_from_id(tid);
+ThreadSnapshot* ts;
+if (jt == NULL) {
+// if the thread does not exist or now it is terminated,
+// create dummy snapshot
+ts = new ThreadSnapshot();
+} else {
+ts = new ThreadSnapshot(jt);
+}
+dump_result.add_thread_snapshot(ts);
+}
+}
+} else {
+// obtain thread dump with the specific list of threads with stack trace
+do_thread_dump(&dump_result,
+ids_ah,
+num_threads,
+maxDepth,
+false, /* no locked monitor */
+false, /* no locked synchronizers */
+CHECK_0);
+}
+int num_snapshots = dump_result.num_snapshots();
+assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
+int index = 0;
+for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
+// For each thread, create an java/lang/management/ThreadInfo object
+// and fill with the thread information
+if (ts->threadObj() == NULL) {
+// if the thread does not exist or now it is terminated, set threadinfo to NULL
+infoArray_h->obj_at_put(index, NULL);
+continue;
+}
+// Create java.lang.management.ThreadInfo object
+instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
+infoArray_h->obj_at_put(index, info_obj);
+}
+return 0;
+JVM_END
+// Dump thread info for the specified threads.
+// It returns an array of ThreadInfo objects. Each element is the ThreadInfo
+// for the thread ID specified in the corresponding entry in
+// the given array of thread IDs; or NULL if the thread does not exist
+// or has terminated.
+//
+// Input parameter:
+//    ids - array of thread IDs; NULL indicates all live threads
+//    locked_monitors - if true, dump locked object monitors
+//    locked_synchronizers - if true, dump locked JSR-166 synchronizers
+//
+JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers))
+ResourceMark rm(THREAD);
+if (JDK_Version::is_gte_jdk16x_version()) {
+// make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
+java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
+}
+typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
+int num_threads = (ta != NULL ? ta->length() : 0);
+typeArrayHandle ids_ah(THREAD, ta);
+ThreadDumpResult dump_result(num_threads);  // can safepoint
+if (ids_ah() != NULL) {
+// validate the thread id array
+validate_thread_id_array(ids_ah, CHECK_NULL);
+// obtain thread dump of a specific list of threads
+do_thread_dump(&dump_result,
+ids_ah,
+num_threads,
+-1, /* entire stack */
+(locked_monitors ? true : false),      /* with locked monitors */
+(locked_synchronizers ? true : false), /* with locked synchronizers */
+CHECK_NULL);
+} else {
+// obtain thread dump of all threads
+VM_ThreadDump op(&dump_result,
+-1, /* entire stack */
+(locked_monitors ? true : false),     /* with locked monitors */
+(locked_synchronizers ? true : false) /* with locked synchronizers */);
+VMThread::execute(&op);
+}
+int num_snapshots = dump_result.num_snapshots();
+// create the result ThreadInfo[] object
+Klass* k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
+instanceKlassHandle ik (THREAD, k);
+objArrayOop r = oopFactory::new_objArray(ik(), num_snapshots, CHECK_NULL);
+objArrayHandle result_h(THREAD, r);
+int index = 0;
+for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
+if (ts->threadObj() == NULL) {
+// if the thread does not exist or now it is terminated, set threadinfo to NULL
+result_h->obj_at_put(index, NULL);
+continue;
+}
+ThreadStackTrace* stacktrace = ts->get_stack_trace();
+assert(stacktrace != NULL, "Must have a stack trace dumped");
+// Create Object[] filled with locked monitors
+// Create int[] filled with the stack depth where a monitor was locked
+int num_frames = stacktrace->get_stack_depth();
+int num_locked_monitors = stacktrace->num_jni_locked_monitors();
+// Count the total number of locked monitors
+for (int i = 0; i < num_frames; i++) {
+StackFrameInfo* frame = stacktrace->stack_frame_at(i);
+num_locked_monitors += frame->num_locked_monitors();
+}
+objArrayHandle monitors_array;
+typeArrayHandle depths_array;
+objArrayHandle synchronizers_array;
+if (locked_monitors) {
+// Constructs Object[] and int[] to contain the object monitor and the stack depth
+// where the thread locked it
+objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
+objArrayHandle mh(THREAD, array);
+monitors_array = mh;
+typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
+typeArrayHandle dh(THREAD, tarray);
+depths_array = dh;
+int count = 0;
+int j = 0;
+for (int depth = 0; depth < num_frames; depth++) {
+StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
+int len = frame->num_locked_monitors();
+GrowableArray<oop>* locked_monitors = frame->locked_monitors();
+for (j = 0; j < len; j++) {
+oop monitor = locked_monitors->at(j);
+assert(monitor != NULL && monitor->is_instance(), "must be a Java object");
+monitors_array->obj_at_put(count, monitor);
+depths_array->int_at_put(count, depth);
+count++;
+}
+}
+GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
+for (j = 0; j < jni_locked_monitors->length(); j++) {
+oop object = jni_locked_monitors->at(j);
+assert(object != NULL && object->is_instance(), "must be a Java object");
+monitors_array->obj_at_put(count, object);
+// Monitor locked via JNI MonitorEnter call doesn't have stack depth info
+depths_array->int_at_put(count, -1);
+count++;
+}
+assert(count == num_locked_monitors, "number of locked monitors doesn't match");
+}
+if (locked_synchronizers) {
+// Create Object[] filled with locked JSR-166 synchronizers
+assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
+ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
+GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
+int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
+objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
+objArrayHandle sh(THREAD, array);
+synchronizers_array = sh;
+for (int k = 0; k < num_locked_synchronizers; k++) {
+synchronizers_array->obj_at_put(k, locks->at(k));
+}
+}
+// Create java.lang.management.ThreadInfo object
+instanceOop info_obj = Management::create_thread_info_instance(ts,
+monitors_array,
+depths_array,
+synchronizers_array,
+CHECK_NULL);
+result_h->obj_at_put(index, info_obj);
+}
+return (jobjectArray) JNIHandles::make_local(env, result_h());
+JVM_END
+// Returns an array of Class objects.
+JVM_ENTRY(jobjectArray, jmm_GetLoadedClasses(JNIEnv *env))
+ResourceMark rm(THREAD);
+LoadedClassesEnumerator lce(THREAD);  // Pass current Thread as parameter
+int num_classes = lce.num_loaded_classes();
+objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), num_classes, CHECK_0);
+objArrayHandle classes_ah(THREAD, r);
+for (int i = 0; i < num_classes; i++) {
+KlassHandle kh = lce.get_klass(i);
+oop mirror = kh()->java_mirror();
+classes_ah->obj_at_put(i, mirror);
+}
+return (jobjectArray) JNIHandles::make_local(env, classes_ah());
+JVM_END
+// Reset statistic.  Return true if the requested statistic is reset.
+// Otherwise, return false.
+//
+// Input parameters:
+//  obj  - specify which instance the statistic associated with to be reset
+//         For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
+//         For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
+//  type - the type of statistic to be reset
+//
+JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
+ResourceMark rm(THREAD);
+switch (type) {
+case JMM_STAT_PEAK_THREAD_COUNT:
+ThreadService::reset_peak_thread_count();
+return true;
+case JMM_STAT_THREAD_CONTENTION_COUNT:
+case JMM_STAT_THREAD_CONTENTION_TIME: {
+jlong tid = obj.j;
+if (tid < 0) {
+THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
+}
+// Look for the JavaThread of this given tid
+MutexLockerEx ml(Threads_lock);
+if (tid == 0) {
+// reset contention statistics for all threads if tid == 0
+for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) {
+if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
+ThreadService::reset_contention_count_stat(java_thread);
+} else {
+ThreadService::reset_contention_time_stat(java_thread);
+}
+}
+} else {
+// reset contention statistics for a given thread
+JavaThread* java_thread = find_java_thread_from_id(tid);
+if (java_thread == NULL) {
+return false;
+}
+if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
+ThreadService::reset_contention_count_stat(java_thread);
+} else {
+ThreadService::reset_contention_time_stat(java_thread);
+}
+}
+return true;
+break;
+}
+case JMM_STAT_PEAK_POOL_USAGE: {
+jobject o = obj.l;
+if (o == NULL) {
+THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
+}
+oop pool_obj = JNIHandles::resolve(o);
+assert(pool_obj->is_instance(), "Should be an instanceOop");
+instanceHandle ph(THREAD, (instanceOop) pool_obj);
+MemoryPool* pool = MemoryService::get_memory_pool(ph);
+if (pool != NULL) {
+pool->reset_peak_memory_usage();
+return true;
+}
+break;
+}
+case JMM_STAT_GC_STAT: {
+jobject o = obj.l;
+if (o == NULL) {
+THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
+}
+GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
+if (mgr != NULL) {
+mgr->reset_gc_stat();
+return true;
+}
+break;
+}
+default:
+assert(0, "Unknown Statistic Type");
+}
+return false;
+JVM_END
+// Returns the fast estimate of CPU time consumed by
+// a given thread (in nanoseconds).
+// If thread_id == 0, return CPU time for the current thread.
+JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
+if (!os::is_thread_cpu_time_supported()) {
+return -1;
+}
+if (thread_id < 0) {
+THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
+"Invalid thread ID", -1);
+}
+JavaThread* java_thread = NULL;
+if (thread_id == 0) {
+// current thread
+return os::current_thread_cpu_time();
+} else {
+MutexLockerEx ml(Threads_lock);
+java_thread = find_java_thread_from_id(thread_id);
+if (java_thread != NULL) {
+return os::thread_cpu_time((Thread*) java_thread);
+}
+}
+return -1;
+JVM_END
+// Returns the CPU time consumed by a given thread (in nanoseconds).
+// If thread_id == 0, CPU time for the current thread is returned.
+// If user_sys_cpu_time = true, user level and system CPU time of
+// a given thread is returned; otherwise, only user level CPU time
+// is returned.
+JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
+if (!os::is_thread_cpu_time_supported()) {
+return -1;
+}
+if (thread_id < 0) {
+THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
+"Invalid thread ID", -1);
+}
+JavaThread* java_thread = NULL;
+if (thread_id == 0) {
+// current thread
+return os::current_thread_cpu_time(user_sys_cpu_time != 0);
+} else {
+MutexLockerEx ml(Threads_lock);
+java_thread = find_java_thread_from_id(thread_id);
+if (java_thread != NULL) {
+return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
+}
+}
+return -1;
+JVM_END
+// Gets an array containing the CPU times consumed by a set of threads
+// (in nanoseconds).  Each element of the array is the CPU time for the
+// thread ID specified in the corresponding entry in the given array
+// of thread IDs; or -1 if the thread does not exist or has terminated.
+// If user_sys_cpu_time = true, the sum of user level and system CPU time
+// for the given thread is returned; otherwise, only user level CPU time
+// is returned.
+JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
+jlongArray timeArray,
+jboolean user_sys_cpu_time))
+// Check if threads is null
+if (ids == NULL || timeArray == NULL) {
+THROW(vmSymbols::java_lang_NullPointerException());
+}
+ResourceMark rm(THREAD);
+typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
+typeArrayHandle ids_ah(THREAD, ta);
+typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
+typeArrayHandle timeArray_h(THREAD, tia);
+// validate the thread id array
+validate_thread_id_array(ids_ah, CHECK);
+// timeArray must be of the same length as the given array of thread IDs
+int num_threads = ids_ah->length();
+if (num_threads != timeArray_h->length()) {
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
+"The length of the given long array does not match the length of "
+"the given array of thread IDs");
+}
+MutexLockerEx ml(Threads_lock);
+for (int i = 0; i < num_threads; i++) {
+JavaThread* java_thread = find_java_thread_from_id(ids_ah->long_at(i));
+if (java_thread != NULL) {
+timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
+user_sys_cpu_time != 0));
+}
+}
+JVM_END
+// Returns a String array of all VM global flag names
+JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
+// last flag entry is always NULL, so subtract 1
+int nFlags = (int) Flag::numFlags - 1;
+// allocate a temp array
+objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
+nFlags, CHECK_0);
+objArrayHandle flags_ah(THREAD, r);
+int num_entries = 0;
+for (int i = 0; i < nFlags; i++) {
+Flag* flag = &Flag::flags[i];
+// Exclude notproduct and develop flags in product builds.
+if (flag->is_constant_in_binary()) {
+continue;
+}
+// Exclude the locked (experimental, diagnostic) flags
+if (flag->is_unlocked() || flag->is_unlocker()) {
+Handle s = java_lang_String::create_from_str(flag->_name, CHECK_0);
+flags_ah->obj_at_put(num_entries, s());
+num_entries++;
+}
+}
+if (num_entries < nFlags) {
+// Return array of right length
+objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
+for(int i = 0; i < num_entries; i++) {
+res->obj_at_put(i, flags_ah->obj_at(i));
+}
+return (jobjectArray)JNIHandles::make_local(env, res);
+}
+return (jobjectArray)JNIHandles::make_local(env, flags_ah());
+JVM_END
+// Utility function used by jmm_GetVMGlobals.  Returns false if flag type
+// can't be determined, true otherwise.  If false is returned, then *global
+// will be incomplete and invalid.
+bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
+Handle flag_name;
+if (name() == NULL) {
+flag_name = java_lang_String::create_from_str(flag->_name, CHECK_false);
+} else {
+flag_name = name;
+}
+global->name = (jstring)JNIHandles::make_local(env, flag_name());
+if (flag->is_bool()) {
+global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
+global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
+} else if (flag->is_intx()) {
+global->value.j = (jlong)flag->get_intx();
+global->type = JMM_VMGLOBAL_TYPE_JLONG;
+} else if (flag->is_uintx()) {
+global->value.j = (jlong)flag->get_uintx();
+global->type = JMM_VMGLOBAL_TYPE_JLONG;
+} else if (flag->is_uint64_t()) {
+global->value.j = (jlong)flag->get_uint64_t();
+global->type = JMM_VMGLOBAL_TYPE_JLONG;
+} else if (flag->is_ccstr()) {
+Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
+global->value.l = (jobject)JNIHandles::make_local(env, str());
+global->type = JMM_VMGLOBAL_TYPE_JSTRING;
+} else {
+global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
+return false;
+}
+global->writeable = flag->is_writeable();
+global->external = flag->is_external();
+switch (flag->get_origin()) {
+case Flag::DEFAULT:
+global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
+break;
+case Flag::COMMAND_LINE:
+global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
+break;
+case Flag::ENVIRON_VAR:
+global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
+break;
+case Flag::CONFIG_FILE:
+global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
+break;
+case Flag::MANAGEMENT:
+global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
+break;
+case Flag::ERGONOMIC:
+global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
+break;
+default:
+global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
+}
+return true;
+}
+// Fill globals array of count length with jmmVMGlobal entries
+// specified by names. If names == NULL, fill globals array
+// with all Flags. Return value is number of entries
+// created in globals.
+// If a Flag with a given name in an array element does not
+// exist, globals[i].name will be set to NULL.
+JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
+jobjectArray names,
+jmmVMGlobal *globals,
+jint count))
+if (globals == NULL) {
+THROW_(vmSymbols::java_lang_NullPointerException(), 0);
+}
+ResourceMark rm(THREAD);
+if (names != NULL) {
+// return the requested globals
+objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
+objArrayHandle names_ah(THREAD, ta);
+// Make sure we have a String array
+Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
+if (element_klass != SystemDictionary::String_klass()) {
+THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
+"Array element type is not String class", 0);
+}
+int names_length = names_ah->length();
+int num_entries = 0;
+for (int i = 0; i < names_length && i < count; i++) {
+oop s = names_ah->obj_at(i);
+if (s == NULL) {
+THROW_(vmSymbols::java_lang_NullPointerException(), 0);
+}
+Handle sh(THREAD, s);
+char* str = java_lang_String::as_utf8_string(s);
+Flag* flag = Flag::find_flag(str, strlen(str));
+if (flag != NULL &&
+add_global_entry(env, sh, &globals[i], flag, THREAD)) {
+num_entries++;
+} else {
+globals[i].name = NULL;
+}
+}
+return num_entries;
+} else {
+// return all globals if names == NULL
+// last flag entry is always NULL, so subtract 1
+int nFlags = (int) Flag::numFlags - 1;
+Handle null_h;
+int num_entries = 0;
+for (int i = 0; i < nFlags && num_entries < count;  i++) {
+Flag* flag = &Flag::flags[i];
+// Exclude notproduct and develop flags in product builds.
+if (flag->is_constant_in_binary()) {
+continue;
+}
+// Exclude the locked (diagnostic, experimental) flags
+if ((flag->is_unlocked() || flag->is_unlocker()) &&
+add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
+num_entries++;
+}
+}
+return num_entries;
+}
+JVM_END
+JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
+ResourceMark rm(THREAD);
+oop fn = JNIHandles::resolve_external_guard(flag_name);
+if (fn == NULL) {
+THROW_MSG(vmSymbols::java_lang_NullPointerException(),
+"The flag name cannot be null.");
+}
+char* name = java_lang_String::as_utf8_string(fn);
+Flag* flag = Flag::find_flag(name, strlen(name));
+if (flag == NULL) {
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
+"Flag does not exist.");
+}
+if (!flag->is_writeable()) {
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
+"This flag is not writeable.");
+}
+bool succeed;
+if (flag->is_bool()) {
+bool bvalue = (new_value.z == JNI_TRUE ? true : false);
+succeed = CommandLineFlags::boolAtPut(name, &bvalue, Flag::MANAGEMENT);
+} else if (flag->is_intx()) {
+intx ivalue = (intx)new_value.j;
+succeed = CommandLineFlags::intxAtPut(name, &ivalue, Flag::MANAGEMENT);
+} else if (flag->is_uintx()) {
+uintx uvalue = (uintx)new_value.j;
+if (strncmp(name, "MaxHeapFreeRatio", 17) == 0) {
+FormatBuffer<80> err_msg("%s", "");
+if (!Arguments::verify_MaxHeapFreeRatio(err_msg, uvalue)) {
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), err_msg.buffer());
+}
+} else if (strncmp(name, "MinHeapFreeRatio", 17) == 0) {
+FormatBuffer<80> err_msg("%s", "");
+if (!Arguments::verify_MinHeapFreeRatio(err_msg, uvalue)) {
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), err_msg.buffer());
+}
+}
+succeed = CommandLineFlags::uintxAtPut(name, &uvalue, Flag::MANAGEMENT);
+} else if (flag->is_uint64_t()) {
+uint64_t uvalue = (uint64_t)new_value.j;
+succeed = CommandLineFlags::uint64_tAtPut(name, &uvalue, Flag::MANAGEMENT);
+} else if (flag->is_ccstr()) {
+oop str = JNIHandles::resolve_external_guard(new_value.l);
+if (str == NULL) {
+THROW(vmSymbols::java_lang_NullPointerException());
+}
+ccstr svalue = java_lang_String::as_utf8_string(str);
+succeed = CommandLineFlags::ccstrAtPut(name, &svalue, Flag::MANAGEMENT);
+}
+assert(succeed, "Setting flag should succeed");
+JVM_END
+class ThreadTimesClosure: public ThreadClosure {
+private:
+objArrayHandle _names_strings;
+char **_names_chars;
+typeArrayHandle _times;
+int _names_len;
+int _times_len;
+int _count;
+public:
+ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
+~ThreadTimesClosure();
+virtual void do_thread(Thread* thread);
+void do_unlocked();
+int count() { return _count; }
+};
+ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
+typeArrayHandle times) {
+assert(names() != NULL, "names was NULL");
+assert(times() != NULL, "times was NULL");
+_names_strings = names;
+_names_len = names->length();
+_names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
+_times = times;
+_times_len = times->length();
+_count = 0;
+}
+//
+// Called with Threads_lock held
+//
+void ThreadTimesClosure::do_thread(Thread* thread) {
+assert(thread != NULL, "thread was NULL");
+// exclude externally visible JavaThreads
+if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
+return;
+}
+if (_count >= _names_len || _count >= _times_len) {
+// skip if the result array is not big enough
+return;
+}
+EXCEPTION_MARK;
+ResourceMark rm(THREAD); // thread->name() uses ResourceArea
+assert(thread->name() != NULL, "All threads should have a name");
+_names_chars[_count] = strdup(thread->name());
+_times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
+os::thread_cpu_time(thread) : -1);
+_count++;
+}
+// Called without Threads_lock, we can allocate String objects.
+void ThreadTimesClosure::do_unlocked() {
+EXCEPTION_MARK;
+for (int i = 0; i < _count; i++) {
+Handle s = java_lang_String::create_from_str(_names_chars[i],  CHECK);
+_names_strings->obj_at_put(i, s());
+}
+}
+ThreadTimesClosure::~ThreadTimesClosure() {
+for (int i = 0; i < _count; i++) {
+free(_names_chars[i]);
+}
+FREE_C_HEAP_ARRAY(char *, _names_chars, mtInternal);
+}
+// Fills names with VM internal thread names and times with the corresponding
+// CPU times.  If names or times is NULL, a NullPointerException is thrown.
+// If the element type of names is not String, an IllegalArgumentException is
+// thrown.
+// If an array is not large enough to hold all the entries, only the entries
+// that fit will be returned.  Return value is the number of VM internal
+// threads entries.
+JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
+jobjectArray names,
+jlongArray times))
+if (names == NULL || times == NULL) {
+THROW_(vmSymbols::java_lang_NullPointerException(), 0);
+}
+objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
+objArrayHandle names_ah(THREAD, na);
+// Make sure we have a String array
+Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
+if (element_klass != SystemDictionary::String_klass()) {
+THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
+"Array element type is not String class", 0);
+}
+typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
+typeArrayHandle times_ah(THREAD, ta);
+ThreadTimesClosure ttc(names_ah, times_ah);
+{
+MutexLockerEx ml(Threads_lock);
+Threads::threads_do(&ttc);
+}
+ttc.do_unlocked();
+return ttc.count();
+JVM_END
+static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
+ResourceMark rm(THREAD);
+VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
+VMThread::execute(&op);
+DeadlockCycle* deadlocks = op.result();
+if (deadlocks == NULL) {
+// no deadlock found and return
+return Handle();
+}
+int num_threads = 0;
+DeadlockCycle* cycle;
+for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
+num_threads += cycle->num_threads();
+}
+objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
+objArrayHandle threads_ah(THREAD, r);
+int index = 0;
+for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
+GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
+int len = deadlock_threads->length();
+for (int i = 0; i < len; i++) {
+threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
+index++;
+}
+}
+return threads_ah;
+}
+// Finds cycles of threads that are deadlocked involved in object monitors
+// and JSR-166 synchronizers.
+// Returns an array of Thread objects which are in deadlock, if any.
+// Otherwise, returns NULL.
+//
+// Input parameter:
+//    object_monitors_only - if true, only check object monitors
+//
+JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
+Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
+return (jobjectArray) JNIHandles::make_local(env, result());
+JVM_END
+// Finds cycles of threads that are deadlocked on monitor locks
+// Returns an array of Thread objects which are in deadlock, if any.
+// Otherwise, returns NULL.
+JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
+Handle result = find_deadlocks(true, CHECK_0);
+return (jobjectArray) JNIHandles::make_local(env, result());
+JVM_END
+// Gets the information about GC extension attributes including
+// the name of the attribute, its type, and a short description.
+//
+// Input parameters:
+//   mgr   - GC memory manager
+//   info  - caller allocated array of jmmExtAttributeInfo
+//   count - number of elements of the info array
+//
+// Returns the number of GC extension attributes filled in the info array; or
+// -1 if info is not big enough
+//
+JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
+// All GC memory managers have 1 attribute (number of GC threads)
+if (count == 0) {
+return 0;
+}
+if (info == NULL) {
+THROW_(vmSymbols::java_lang_NullPointerException(), 0);
+}
+info[0].name = "GcThreadCount";
+info[0].type = 'I';
+info[0].description = "Number of GC threads";
+return 1;
+JVM_END
+// verify the given array is an array of java/lang/management/MemoryUsage objects
+// of a given length and return the objArrayOop
+static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
+if (array == NULL) {
+THROW_(vmSymbols::java_lang_NullPointerException(), 0);
+}
+objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
+objArrayHandle array_h(THREAD, oa);
+// array must be of the given length
+if (length != array_h->length()) {
+THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
+"The length of the given MemoryUsage array does not match the number of memory pools.", 0);
+}
+// check if the element of array is of type MemoryUsage class
+Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
+Klass* element_klass = ObjArrayKlass::cast(array_h->klass())->element_klass();
+if (element_klass != usage_klass) {
+THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
+"The element type is not MemoryUsage class", 0);
+}
+return array_h();
+}
+// Gets the statistics of the last GC of a given GC memory manager.
+// Input parameters:
+//   obj     - GarbageCollectorMXBean object
+//   gc_stat - caller allocated jmmGCStat where:
+//     a. before_gc_usage - array of MemoryUsage objects
+//     b. after_gc_usage  - array of MemoryUsage objects
+//     c. gc_ext_attributes_values_size is set to the
+//        gc_ext_attribute_values array allocated
+//     d. gc_ext_attribute_values is a caller allocated array of jvalue.
+//
+// On return,
+//   gc_index == 0 indicates no GC statistics available
+//
+//   before_gc_usage and after_gc_usage - filled with per memory pool
+//      before and after GC usage in the same order as the memory pools
+//      returned by GetMemoryPools for a given GC memory manager.
+//   num_gc_ext_attributes indicates the number of elements in
+//      the gc_ext_attribute_values array is filled; or
+//      -1 if the gc_ext_attributes_values array is not big enough
+//
+JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
+ResourceMark rm(THREAD);
+if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
+THROW(vmSymbols::java_lang_NullPointerException());
+}
+// Get the GCMemoryManager
+GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
+// Make a copy of the last GC statistics
+// GC may occur while constructing the last GC information
+int num_pools = MemoryService::num_memory_pools();
+GCStatInfo stat(num_pools);
+if (mgr->get_last_gc_stat(&stat) == 0) {
+gc_stat->gc_index = 0;
+return;
+}
+gc_stat->gc_index = stat.gc_index();
+gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
+gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
+// Current implementation does not have GC extension attributes
+gc_stat->num_gc_ext_attributes = 0;
+// Fill the arrays of MemoryUsage objects with before and after GC
+// per pool memory usage
+objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
+num_pools,
+CHECK);
+objArrayHandle usage_before_gc_ah(THREAD, bu);
+objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
+num_pools,
+CHECK);
+objArrayHandle usage_after_gc_ah(THREAD, au);
+for (int i = 0; i < num_pools; i++) {
+Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
+Handle after_usage;
+MemoryUsage u = stat.after_gc_usage_for_pool(i);
+if (u.max_size() == 0 && u.used() > 0) {
+// If max size == 0, this pool is a survivor space.
+// Set max size = -1 since the pools will be swapped after GC.
+MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
+after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
+} else {
+after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
+}
+usage_before_gc_ah->obj_at_put(i, before_usage());
+usage_after_gc_ah->obj_at_put(i, after_usage());
+}
+if (gc_stat->gc_ext_attribute_values_size > 0) {
+// Current implementation only has 1 attribute (number of GC threads)
+// The type is 'I'
+gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
+}
+JVM_END
+JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
+ResourceMark rm(THREAD);
+// Get the GCMemoryManager
+GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
+mgr->set_notification_enabled(enabled?true:false);
+JVM_END
+// Dump heap - Returns 0 if succeeds.
+JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
+#if INCLUDE_SERVICES
+ResourceMark rm(THREAD);
+oop on = JNIHandles::resolve_external_guard(outputfile);
+if (on == NULL) {
+THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
+"Output file name cannot be null.", -1);
+}
+char* name = java_lang_String::as_platform_dependent_str(on, CHECK_(-1));
+if (name == NULL) {
+THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
+"Output file name cannot be null.", -1);
+}
+HeapDumper dumper(live ? true : false);
+if (dumper.dump(name) != 0) {
+const char* errmsg = dumper.error_as_C_string();
+THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
+}
+return 0;
+#else  // INCLUDE_SERVICES
+return -1;
+#endif // INCLUDE_SERVICES
+JVM_END
+JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
+ResourceMark rm(THREAD);
+GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
+objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
+dcmd_list->length(), CHECK_NULL);
+objArrayHandle cmd_array(THREAD, cmd_array_oop);
+for (int i = 0; i < dcmd_list->length(); i++) {
+oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
+cmd_array->obj_at_put(i, cmd_name);
+}
+return (jobjectArray) JNIHandles::make_local(env, cmd_array());
+JVM_END
+JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
+dcmdInfo* infoArray))
+if (cmds == NULL || infoArray == NULL) {
+THROW(vmSymbols::java_lang_NullPointerException());
+}
+ResourceMark rm(THREAD);
+objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
+objArrayHandle cmds_ah(THREAD, ca);
+// Make sure we have a String array
+Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
+if (element_klass != SystemDictionary::String_klass()) {
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
+"Array element type is not String class");
+}
+GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
+int num_cmds = cmds_ah->length();
+for (int i = 0; i < num_cmds; i++) {
+oop cmd = cmds_ah->obj_at(i);
+if (cmd == NULL) {
+THROW_MSG(vmSymbols::java_lang_NullPointerException(),
+"Command name cannot be null.");
+}
+char* cmd_name = java_lang_String::as_utf8_string(cmd);
+if (cmd_name == NULL) {
+THROW_MSG(vmSymbols::java_lang_NullPointerException(),
+"Command name cannot be null.");
+}
+int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
+if (pos == -1) {
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
+"Unknown diagnostic command");
+}
+DCmdInfo* info = info_list->at(pos);
+infoArray[i].name = info->name();
+infoArray[i].description = info->description();
+infoArray[i].impact = info->impact();
+JavaPermission p = info->permission();
+infoArray[i].permission_class = p._class;
+infoArray[i].permission_name = p._name;
+infoArray[i].permission_action = p._action;
+infoArray[i].num_arguments = info->num_arguments();
+infoArray[i].enabled = info->is_enabled();
+}
+JVM_END
+JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
+jstring command, dcmdArgInfo* infoArray))
+ResourceMark rm(THREAD);
+oop cmd = JNIHandles::resolve_external_guard(command);
+if (cmd == NULL) {
+THROW_MSG(vmSymbols::java_lang_NullPointerException(),
+"Command line cannot be null.");
+}
+char* cmd_name = java_lang_String::as_utf8_string(cmd);
+if (cmd_name == NULL) {
+THROW_MSG(vmSymbols::java_lang_NullPointerException(),
+"Command line content cannot be null.");
+}
+DCmd* dcmd = NULL;
+DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
+strlen(cmd_name));
+if (factory != NULL) {
+dcmd = factory->create_resource_instance(NULL);
+}
+if (dcmd == NULL) {
+THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
+"Unknown diagnostic command");
+}
+DCmdMark mark(dcmd);
+GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
+if (array->length() == 0) {
+return;
+}
+for (int i = 0; i < array->length(); i++) {
+infoArray[i].name = array->at(i)->name();
+infoArray[i].description = array->at(i)->description();
+infoArray[i].type = array->at(i)->type();
+infoArray[i].default_string = array->at(i)->default_string();
+infoArray[i].mandatory = array->at(i)->is_mandatory();
+infoArray[i].option = array->at(i)->is_option();
+infoArray[i].multiple = array->at(i)->is_multiple();
+infoArray[i].position = array->at(i)->position();
+}
+return;
+JVM_END
+JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
+ResourceMark rm(THREAD);
+oop cmd = JNIHandles::resolve_external_guard(commandline);
+if (cmd == NULL) {
+THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
+"Command line cannot be null.");
+}
+char* cmdline = java_lang_String::as_utf8_string(cmd);
+if (cmdline == NULL) {
+THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
+"Command line content cannot be null.");
+}
+bufferedStream output;
+DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
+oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
+return (jstring) JNIHandles::make_local(env, result);
+JVM_END
+JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
+DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
+JVM_END
+jlong Management::ticks_to_ms(jlong ticks) {
+assert(os::elapsed_frequency() > 0, "Must be non-zero");
+return (jlong)(((double)ticks / (double)os::elapsed_frequency())
+* (double)1000.0);
+}
+const struct jmmInterface_1_ jmm_interface = {
+NULL,
+NULL,
+jmm_GetVersion,
+jmm_GetOptionalSupport,
+jmm_GetInputArguments,
+jmm_GetThreadInfo,
+jmm_GetInputArgumentArray,
+jmm_GetMemoryPools,
+jmm_GetMemoryManagers,
+jmm_GetMemoryPoolUsage,
+jmm_GetPeakMemoryPoolUsage,
+jmm_GetThreadAllocatedMemory,
+jmm_GetMemoryUsage,
+jmm_GetLongAttribute,
+jmm_GetBoolAttribute,
+jmm_SetBoolAttribute,
+jmm_GetLongAttributes,
+jmm_FindMonitorDeadlockedThreads,
+jmm_GetThreadCpuTime,
+jmm_GetVMGlobalNames,
+jmm_GetVMGlobals,
+jmm_GetInternalThreadTimes,
+jmm_ResetStatistic,
+jmm_SetPoolSensor,
+jmm_SetPoolThreshold,
+jmm_GetPoolCollectionUsage,
+jmm_GetGCExtAttributeInfo,
+jmm_GetLastGCStat,
+jmm_GetThreadCpuTimeWithKind,
+jmm_GetThreadCpuTimesWithKind,
+jmm_DumpHeap0,
+jmm_FindDeadlockedThreads,
+jmm_SetVMGlobal,
+NULL,
+jmm_DumpThreads,
+jmm_SetGCNotificationEnabled,
+jmm_GetDiagnosticCommands,
+jmm_GetDiagnosticCommandInfo,
+jmm_GetDiagnosticCommandArgumentsInfo,
+jmm_ExecuteDiagnosticCommand,
+jmm_SetDiagnosticFrameworkNotificationEnabled
+};
+#endif // INCLUDE_MANAGEMENT
+void* Management::get_jmm_interface(int version) {
+#if INCLUDE_MANAGEMENT
+if (version == JMM_VERSION_1_0) {
+return (void*) &jmm_interface;
+}
+#endif // INCLUDE_MANAGEMENT
+return NULL;
+}

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

comparison: src/share/vm/services/management.cpp

src/share/vm/services/management.cpp