1 /*
   2  * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "jmm.h"
  27 #include "classfile/systemDictionary.hpp"
  28 #include "compiler/compileBroker.hpp"
  29 #include "memory/allocation.inline.hpp"
  30 #include "memory/iterator.hpp"
  31 #include "memory/oopFactory.hpp"
  32 #include "memory/resourceArea.hpp"
  33 #include "oops/klass.hpp"
  34 #include "oops/objArrayKlass.hpp"
  35 #include "oops/objArrayOop.inline.hpp"
  36 #include "oops/oop.inline.hpp"
  37 #include "oops/typeArrayOop.inline.hpp"
  38 #include "runtime/arguments.hpp"
  39 #include "runtime/flags/jvmFlag.hpp"
  40 #include "runtime/globals.hpp"
  41 #include "runtime/handles.inline.hpp"
  42 #include "runtime/interfaceSupport.inline.hpp"
  43 #include "runtime/javaCalls.hpp"
  44 #include "runtime/jniHandles.inline.hpp"
  45 #include "runtime/os.hpp"
  46 #include "runtime/serviceThread.hpp"
  47 #include "runtime/thread.inline.hpp"
  48 #include "runtime/threadSMR.hpp"
  49 #include "services/classLoadingService.hpp"
  50 #include "services/diagnosticCommand.hpp"
  51 #include "services/diagnosticFramework.hpp"
  52 #include "services/writeableFlags.hpp"
  53 #include "services/heapDumper.hpp"
  54 #include "services/lowMemoryDetector.hpp"
  55 #include "services/gcNotifier.hpp"
  56 #include "services/nmtDCmd.hpp"
  57 #include "services/management.hpp"
  58 #include "services/memoryManager.hpp"
  59 #include "services/memoryPool.hpp"
  60 #include "services/memoryService.hpp"
  61 #include "services/runtimeService.hpp"
  62 #include "services/threadService.hpp"
  63 #include "utilities/debug.hpp"
  64 #include "utilities/formatBuffer.hpp"
  65 #include "utilities/macros.hpp"
  66 
  67 PerfVariable* Management::_begin_vm_creation_time = NULL;
  68 PerfVariable* Management::_end_vm_creation_time = NULL;
  69 PerfVariable* Management::_vm_init_done_time = NULL;
  70 
  71 InstanceKlass* Management::_diagnosticCommandImpl_klass = NULL;
  72 InstanceKlass* Management::_garbageCollectorExtImpl_klass = NULL;
  73 InstanceKlass* Management::_garbageCollectorMXBean_klass = NULL;
  74 InstanceKlass* Management::_gcInfo_klass = NULL;
  75 InstanceKlass* Management::_managementFactoryHelper_klass = NULL;
  76 InstanceKlass* Management::_memoryManagerMXBean_klass = NULL;
  77 InstanceKlass* Management::_memoryPoolMXBean_klass = NULL;
  78 InstanceKlass* Management::_memoryUsage_klass = NULL;
  79 InstanceKlass* Management::_sensor_klass = NULL;
  80 InstanceKlass* Management::_threadInfo_klass = NULL;
  81 
  82 jmmOptionalSupport Management::_optional_support = {0};
  83 TimeStamp Management::_stamp;
  84 
  85 void management_init() {
  86 #if INCLUDE_MANAGEMENT
  87   Management::init();
  88   ThreadService::init();
  89   RuntimeService::init();
  90   ClassLoadingService::init();
  91 #else
  92   ThreadService::init();
  93 #endif // INCLUDE_MANAGEMENT
  94 }
  95 
  96 #if INCLUDE_MANAGEMENT
  97 
  98 void Management::init() {
  99   EXCEPTION_MARK;
 100 
 101   // These counters are for java.lang.management API support.
 102   // They are created even if -XX:-UsePerfData is set and in
 103   // that case, they will be allocated on C heap.
 104 
 105   _begin_vm_creation_time =
 106             PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
 107                                              PerfData::U_None, CHECK);
 108 
 109   _end_vm_creation_time =
 110             PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
 111                                              PerfData::U_None, CHECK);
 112 
 113   _vm_init_done_time =
 114             PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
 115                                              PerfData::U_None, CHECK);
 116 
 117   // Initialize optional support
 118   _optional_support.isLowMemoryDetectionSupported = 1;
 119   _optional_support.isCompilationTimeMonitoringSupported = 1;
 120   _optional_support.isThreadContentionMonitoringSupported = 1;
 121 
 122   if (os::is_thread_cpu_time_supported()) {
 123     _optional_support.isCurrentThreadCpuTimeSupported = 1;
 124     _optional_support.isOtherThreadCpuTimeSupported = 1;
 125   } else {
 126     _optional_support.isCurrentThreadCpuTimeSupported = 0;
 127     _optional_support.isOtherThreadCpuTimeSupported = 0;
 128   }
 129 
 130   _optional_support.isObjectMonitorUsageSupported = 1;
 131 #if INCLUDE_SERVICES
 132   // This depends on the heap inspector
 133   _optional_support.isSynchronizerUsageSupported = 1;
 134 #endif // INCLUDE_SERVICES
 135   _optional_support.isThreadAllocatedMemorySupported = 1;
 136   _optional_support.isRemoteDiagnosticCommandsSupported = 1;
 137 
 138   // Registration of the diagnostic commands
 139   DCmdRegistrant::register_dcmds();
 140   DCmdRegistrant::register_dcmds_ext();
 141   uint32_t full_export = DCmd_Source_Internal | DCmd_Source_AttachAPI
 142                          | DCmd_Source_MBean;
 143   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(full_export, true, false));
 144 }
 145 
 146 void Management::initialize(TRAPS) {
 147   // Start the service thread
 148   ServiceThread::initialize();
 149 
 150   if (ManagementServer) {
 151     ResourceMark rm(THREAD);
 152     HandleMark hm(THREAD);
 153 
 154     // Load and initialize the jdk.internal.agent.Agent class
 155     // invoke startAgent method to start the management server
 156     Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
 157     Klass* k = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_agent_Agent(),
 158                                                    loader,
 159                                                    Handle(),
 160                                                    THREAD);
 161     if (k == NULL) {
 162       vm_exit_during_initialization("Management agent initialization failure: "
 163           "class jdk.internal.agent.Agent not found.");
 164     }
 165 
 166     JavaValue result(T_VOID);
 167     JavaCalls::call_static(&result,
 168                            k,
 169                            vmSymbols::startAgent_name(),
 170                            vmSymbols::void_method_signature(),
 171                            CHECK);
 172   }
 173 }
 174 
 175 void Management::get_optional_support(jmmOptionalSupport* support) {
 176   memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
 177 }
 178 
 179 InstanceKlass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
 180   Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
 181   return initialize_klass(k, THREAD);
 182 }
 183 
 184 InstanceKlass* Management::load_and_initialize_klass_or_null(Symbol* sh, TRAPS) {
 185   Klass* k = SystemDictionary::resolve_or_null(sh, CHECK_NULL);
 186   if (k == NULL) {
 187      return NULL;
 188   }
 189   return initialize_klass(k, THREAD);
 190 }
 191 
 192 InstanceKlass* Management::initialize_klass(Klass* k, TRAPS) {
 193   InstanceKlass* ik = InstanceKlass::cast(k);
 194   if (ik->should_be_initialized()) {
 195     ik->initialize(CHECK_NULL);
 196   }
 197   // If these classes change to not be owned by the boot loader, they need
 198   // to be walked to keep their class loader alive in oops_do.
 199   assert(ik->class_loader() == NULL, "need to follow in oops_do");
 200   return ik;
 201 }
 202 
 203 void Management::record_vm_startup_time(jlong begin, jlong duration) {
 204   // if the performance counter is not initialized,
 205   // then vm initialization failed; simply return.
 206   if (_begin_vm_creation_time == NULL) return;
 207 
 208   _begin_vm_creation_time->set_value(begin);
 209   _end_vm_creation_time->set_value(begin + duration);
 210   PerfMemory::set_accessible(true);
 211 }
 212 
 213 jlong Management::timestamp() {
 214   TimeStamp t;
 215   t.update();
 216   return t.ticks() - _stamp.ticks();
 217 }
 218 
 219 void Management::oops_do(OopClosure* f) {
 220   MemoryService::oops_do(f);
 221   ThreadService::oops_do(f);
 222 }
 223 
 224 InstanceKlass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {
 225   if (_threadInfo_klass == NULL) {
 226     _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
 227   }
 228   return _threadInfo_klass;
 229 }
 230 
 231 InstanceKlass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {
 232   if (_memoryUsage_klass == NULL) {
 233     _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
 234   }
 235   return _memoryUsage_klass;
 236 }
 237 
 238 InstanceKlass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
 239   if (_memoryPoolMXBean_klass == NULL) {
 240     _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
 241   }
 242   return _memoryPoolMXBean_klass;
 243 }
 244 
 245 InstanceKlass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
 246   if (_memoryManagerMXBean_klass == NULL) {
 247     _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
 248   }
 249   return _memoryManagerMXBean_klass;
 250 }
 251 
 252 InstanceKlass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
 253   if (_garbageCollectorMXBean_klass == NULL) {
 254       _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
 255   }
 256   return _garbageCollectorMXBean_klass;
 257 }
 258 
 259 InstanceKlass* Management::sun_management_Sensor_klass(TRAPS) {
 260   if (_sensor_klass == NULL) {
 261     _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
 262   }
 263   return _sensor_klass;
 264 }
 265 
 266 InstanceKlass* Management::sun_management_ManagementFactoryHelper_klass(TRAPS) {
 267   if (_managementFactoryHelper_klass == NULL) {
 268     _managementFactoryHelper_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactoryHelper(), CHECK_NULL);
 269   }
 270   return _managementFactoryHelper_klass;
 271 }
 272 
 273 InstanceKlass* Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(TRAPS) {
 274   if (_garbageCollectorExtImpl_klass == NULL) {
 275     _garbageCollectorExtImpl_klass =
 276                 load_and_initialize_klass_or_null(vmSymbols::com_sun_management_internal_GarbageCollectorExtImpl(), CHECK_NULL);
 277   }
 278   return _garbageCollectorExtImpl_klass;
 279 }
 280 
 281 InstanceKlass* Management::com_sun_management_GcInfo_klass(TRAPS) {
 282   if (_gcInfo_klass == NULL) {
 283     _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
 284   }
 285   return _gcInfo_klass;
 286 }
 287 
 288 InstanceKlass* Management::com_sun_management_internal_DiagnosticCommandImpl_klass(TRAPS) {
 289   if (_diagnosticCommandImpl_klass == NULL) {
 290     _diagnosticCommandImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_DiagnosticCommandImpl(), CHECK_NULL);
 291   }
 292   return _diagnosticCommandImpl_klass;
 293 }
 294 
 295 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
 296   Handle snapshot_thread(THREAD, snapshot->threadObj());
 297 
 298   jlong contended_time;
 299   jlong waited_time;
 300   if (ThreadService::is_thread_monitoring_contention()) {
 301     contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
 302     waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
 303   } else {
 304     // set them to -1 if thread contention monitoring is disabled.
 305     contended_time = max_julong;
 306     waited_time = max_julong;
 307   }
 308 
 309   int thread_status = snapshot->thread_status();
 310   assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
 311   if (snapshot->is_ext_suspended()) {
 312     thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
 313   }
 314   if (snapshot->is_in_native()) {
 315     thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
 316   }
 317 
 318   ThreadStackTrace* st = snapshot->get_stack_trace();
 319   Handle stacktrace_h;
 320   if (st != NULL) {
 321     stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
 322   } else {
 323     stacktrace_h = Handle();
 324   }
 325 
 326   args->push_oop(snapshot_thread);
 327   args->push_int(thread_status);
 328   args->push_oop(Handle(THREAD, snapshot->blocker_object()));
 329   args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
 330   args->push_long(snapshot->contended_enter_count());
 331   args->push_long(contended_time);
 332   args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
 333   args->push_long(waited_time);
 334   args->push_oop(stacktrace_h);
 335 }
 336 
 337 // Helper function to construct a ThreadInfo object
 338 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
 339   InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
 340   JavaCallArguments args(14);
 341 
 342   // initialize the arguments for the ThreadInfo constructor
 343   initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
 344 
 345   // Call ThreadInfo constructor with no locked monitors and synchronizers
 346   Handle element = JavaCalls::construct_new_instance(
 347                           ik,
 348                           vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
 349                           &args,
 350                           CHECK_NULL);
 351   return (instanceOop) element();
 352 }
 353 
 354 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
 355                                                     objArrayHandle monitors_array,
 356                                                     typeArrayHandle depths_array,
 357                                                     objArrayHandle synchronizers_array,
 358                                                     TRAPS) {
 359   InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
 360   JavaCallArguments args(17);
 361 
 362   // initialize the arguments for the ThreadInfo constructor
 363   initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
 364 
 365   // push the locked monitors and synchronizers in the arguments
 366   args.push_oop(monitors_array);
 367   args.push_oop(depths_array);
 368   args.push_oop(synchronizers_array);
 369 
 370   // Call ThreadInfo constructor with locked monitors and synchronizers
 371   Handle element = JavaCalls::construct_new_instance(
 372                           ik,
 373                           vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
 374                           &args,
 375                           CHECK_NULL);
 376   return (instanceOop) element();
 377 }
 378 
 379 
 380 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
 381   if (mgr == NULL) {
 382     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
 383   }
 384   oop mgr_obj = JNIHandles::resolve(mgr);
 385   instanceHandle h(THREAD, (instanceOop) mgr_obj);
 386 
 387   InstanceKlass* k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
 388   if (!h->is_a(k)) {
 389     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
 390                "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
 391                NULL);
 392   }
 393 
 394   MemoryManager* gc = MemoryService::get_memory_manager(h);
 395   if (gc == NULL || !gc->is_gc_memory_manager()) {
 396     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
 397                "Invalid GC memory manager",
 398                NULL);
 399   }
 400   return (GCMemoryManager*) gc;
 401 }
 402 
 403 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
 404   if (obj == NULL) {
 405     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
 406   }
 407 
 408   oop pool_obj = JNIHandles::resolve(obj);
 409   assert(pool_obj->is_instance(), "Should be an instanceOop");
 410   instanceHandle ph(THREAD, (instanceOop) pool_obj);
 411 
 412   return MemoryService::get_memory_pool(ph);
 413 }
 414 
 415 #endif // INCLUDE_MANAGEMENT
 416 
 417 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
 418   int num_threads = ids_ah->length();
 419 
 420   // Validate input thread IDs
 421   int i = 0;
 422   for (i = 0; i < num_threads; i++) {
 423     jlong tid = ids_ah->long_at(i);
 424     if (tid <= 0) {
 425       // throw exception if invalid thread id.
 426       THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
 427                 "Invalid thread ID entry");
 428     }
 429   }
 430 }
 431 
 432 #if INCLUDE_MANAGEMENT
 433 
 434 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
 435   // check if the element of infoArray is of type ThreadInfo class
 436   Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
 437   Klass* element_klass = ObjArrayKlass::cast(infoArray_h->klass())->element_klass();
 438   if (element_klass != threadinfo_klass) {
 439     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
 440               "infoArray element type is not ThreadInfo class");
 441   }
 442 }
 443 
 444 
 445 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
 446   if (obj == NULL) {
 447     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
 448   }
 449 
 450   oop mgr_obj = JNIHandles::resolve(obj);
 451   assert(mgr_obj->is_instance(), "Should be an instanceOop");
 452   instanceHandle mh(THREAD, (instanceOop) mgr_obj);
 453 
 454   return MemoryService::get_memory_manager(mh);
 455 }
 456 
 457 // Returns a version string and sets major and minor version if
 458 // the input parameters are non-null.
 459 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
 460   return JMM_VERSION;
 461 JVM_END
 462 
 463 // Gets the list of VM monitoring and management optional supports
 464 // Returns 0 if succeeded; otherwise returns non-zero.
 465 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
 466   if (support == NULL) {
 467     return -1;
 468   }
 469   Management::get_optional_support(support);
 470   return 0;
 471 JVM_END
 472 
 473 // Returns an array of java/lang/management/MemoryPoolMXBean object
 474 // one for each memory pool if obj == null; otherwise returns
 475 // an array of memory pools for a given memory manager if
 476 // it is a valid memory manager.
 477 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
 478   ResourceMark rm(THREAD);
 479 
 480   int num_memory_pools;
 481   MemoryManager* mgr = NULL;
 482   if (obj == NULL) {
 483     num_memory_pools = MemoryService::num_memory_pools();
 484   } else {
 485     mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
 486     if (mgr == NULL) {
 487       return NULL;
 488     }
 489     num_memory_pools = mgr->num_memory_pools();
 490   }
 491 
 492   // Allocate the resulting MemoryPoolMXBean[] object
 493   InstanceKlass* ik = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
 494   objArrayOop r = oopFactory::new_objArray(ik, num_memory_pools, CHECK_NULL);
 495   objArrayHandle poolArray(THREAD, r);
 496 
 497   if (mgr == NULL) {
 498     // Get all memory pools
 499     for (int i = 0; i < num_memory_pools; i++) {
 500       MemoryPool* pool = MemoryService::get_memory_pool(i);
 501       instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
 502       instanceHandle ph(THREAD, p);
 503       poolArray->obj_at_put(i, ph());
 504     }
 505   } else {
 506     // Get memory pools managed by a given memory manager
 507     for (int i = 0; i < num_memory_pools; i++) {
 508       MemoryPool* pool = mgr->get_memory_pool(i);
 509       instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
 510       instanceHandle ph(THREAD, p);
 511       poolArray->obj_at_put(i, ph());
 512     }
 513   }
 514   return (jobjectArray) JNIHandles::make_local(env, poolArray());
 515 JVM_END
 516 
 517 // Returns an array of java/lang/management/MemoryManagerMXBean object
 518 // one for each memory manager if obj == null; otherwise returns
 519 // an array of memory managers for a given memory pool if
 520 // it is a valid memory pool.
 521 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
 522   ResourceMark rm(THREAD);
 523 
 524   int num_mgrs;
 525   MemoryPool* pool = NULL;
 526   if (obj == NULL) {
 527     num_mgrs = MemoryService::num_memory_managers();
 528   } else {
 529     pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 530     if (pool == NULL) {
 531       return NULL;
 532     }
 533     num_mgrs = pool->num_memory_managers();
 534   }
 535 
 536   // Allocate the resulting MemoryManagerMXBean[] object
 537   InstanceKlass* ik = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
 538   objArrayOop r = oopFactory::new_objArray(ik, num_mgrs, CHECK_NULL);
 539   objArrayHandle mgrArray(THREAD, r);
 540 
 541   if (pool == NULL) {
 542     // Get all memory managers
 543     for (int i = 0; i < num_mgrs; i++) {
 544       MemoryManager* mgr = MemoryService::get_memory_manager(i);
 545       instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
 546       instanceHandle ph(THREAD, p);
 547       mgrArray->obj_at_put(i, ph());
 548     }
 549   } else {
 550     // Get memory managers for a given memory pool
 551     for (int i = 0; i < num_mgrs; i++) {
 552       MemoryManager* mgr = pool->get_memory_manager(i);
 553       instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
 554       instanceHandle ph(THREAD, p);
 555       mgrArray->obj_at_put(i, ph());
 556     }
 557   }
 558   return (jobjectArray) JNIHandles::make_local(env, mgrArray());
 559 JVM_END
 560 
 561 
 562 // Returns a java/lang/management/MemoryUsage object containing the memory usage
 563 // of a given memory pool.
 564 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
 565   ResourceMark rm(THREAD);
 566 
 567   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 568   if (pool != NULL) {
 569     MemoryUsage usage = pool->get_memory_usage();
 570     Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 571     return JNIHandles::make_local(env, h());
 572   } else {
 573     return NULL;
 574   }
 575 JVM_END
 576 
 577 // Returns a java/lang/management/MemoryUsage object containing the memory usage
 578 // of a given memory pool.
 579 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
 580   ResourceMark rm(THREAD);
 581 
 582   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 583   if (pool != NULL) {
 584     MemoryUsage usage = pool->get_peak_memory_usage();
 585     Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 586     return JNIHandles::make_local(env, h());
 587   } else {
 588     return NULL;
 589   }
 590 JVM_END
 591 
 592 // Returns a java/lang/management/MemoryUsage object containing the memory usage
 593 // of a given memory pool after most recent GC.
 594 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
 595   ResourceMark rm(THREAD);
 596 
 597   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 598   if (pool != NULL && pool->is_collected_pool()) {
 599     MemoryUsage usage = pool->get_last_collection_usage();
 600     Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 601     return JNIHandles::make_local(env, h());
 602   } else {
 603     return NULL;
 604   }
 605 JVM_END
 606 
 607 // Sets the memory pool sensor for a threshold type
 608 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
 609   if (obj == NULL || sensorObj == NULL) {
 610     THROW(vmSymbols::java_lang_NullPointerException());
 611   }
 612 
 613   InstanceKlass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
 614   oop s = JNIHandles::resolve(sensorObj);
 615   assert(s->is_instance(), "Sensor should be an instanceOop");
 616   instanceHandle sensor_h(THREAD, (instanceOop) s);
 617   if (!sensor_h->is_a(sensor_klass)) {
 618     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
 619               "Sensor is not an instance of sun.management.Sensor class");
 620   }
 621 
 622   MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
 623   assert(mpool != NULL, "MemoryPool should exist");
 624 
 625   switch (type) {
 626     case JMM_USAGE_THRESHOLD_HIGH:
 627     case JMM_USAGE_THRESHOLD_LOW:
 628       // have only one sensor for threshold high and low
 629       mpool->set_usage_sensor_obj(sensor_h);
 630       break;
 631     case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
 632     case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
 633       // have only one sensor for threshold high and low
 634       mpool->set_gc_usage_sensor_obj(sensor_h);
 635       break;
 636     default:
 637       assert(false, "Unrecognized type");
 638   }
 639 
 640 JVM_END
 641 
 642 
 643 // Sets the threshold of a given memory pool.
 644 // Returns the previous threshold.
 645 //
 646 // Input parameters:
 647 //   pool      - the MemoryPoolMXBean object
 648 //   type      - threshold type
 649 //   threshold - the new threshold (must not be negative)
 650 //
 651 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
 652   if (threshold < 0) {
 653     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
 654                "Invalid threshold value",
 655                -1);
 656   }
 657 
 658   if ((size_t)threshold > max_uintx) {
 659     stringStream st;
 660     st.print("Invalid valid threshold value. Threshold value (" JLONG_FORMAT ") > max value of size_t (" UINTX_FORMAT ")", threshold, max_uintx);
 661     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
 662   }
 663 
 664   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
 665   assert(pool != NULL, "MemoryPool should exist");
 666 
 667   jlong prev = 0;
 668   switch (type) {
 669     case JMM_USAGE_THRESHOLD_HIGH:
 670       if (!pool->usage_threshold()->is_high_threshold_supported()) {
 671         return -1;
 672       }
 673       prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
 674       break;
 675 
 676     case JMM_USAGE_THRESHOLD_LOW:
 677       if (!pool->usage_threshold()->is_low_threshold_supported()) {
 678         return -1;
 679       }
 680       prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
 681       break;
 682 
 683     case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
 684       if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
 685         return -1;
 686       }
 687       // return and the new threshold is effective for the next GC
 688       return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
 689 
 690     case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
 691       if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
 692         return -1;
 693       }
 694       // return and the new threshold is effective for the next GC
 695       return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
 696 
 697     default:
 698       assert(false, "Unrecognized type");
 699       return -1;
 700   }
 701 
 702   // When the threshold is changed, reevaluate if the low memory
 703   // detection is enabled.
 704   if (prev != threshold) {
 705     LowMemoryDetector::recompute_enabled_for_collected_pools();
 706     LowMemoryDetector::detect_low_memory(pool);
 707   }
 708   return prev;
 709 JVM_END
 710 
 711 // Returns a java/lang/management/MemoryUsage object representing
 712 // the memory usage for the heap or non-heap memory.
 713 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
 714   ResourceMark rm(THREAD);
 715 
 716   MemoryUsage usage;
 717 
 718   if (heap) {
 719     usage = Universe::heap()->memory_usage();
 720   } else {
 721     // Calculate the memory usage by summing up the pools.
 722     size_t total_init = 0;
 723     size_t total_used = 0;
 724     size_t total_committed = 0;
 725     size_t total_max = 0;
 726     bool   has_undefined_init_size = false;
 727     bool   has_undefined_max_size = false;
 728 
 729     for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
 730       MemoryPool* pool = MemoryService::get_memory_pool(i);
 731       if (pool->is_non_heap()) {
 732         MemoryUsage u = pool->get_memory_usage();
 733         total_used += u.used();
 734         total_committed += u.committed();
 735 
 736         if (u.init_size() == MemoryUsage::undefined_size()) {
 737           has_undefined_init_size = true;
 738         }
 739         if (!has_undefined_init_size) {
 740           total_init += u.init_size();
 741         }
 742 
 743         if (u.max_size() == MemoryUsage::undefined_size()) {
 744           has_undefined_max_size = true;
 745         }
 746         if (!has_undefined_max_size) {
 747           total_max += u.max_size();
 748         }
 749       }
 750     }
 751 
 752     // if any one of the memory pool has undefined init_size or max_size,
 753     // set it to MemoryUsage::undefined_size()
 754     if (has_undefined_init_size) {
 755       total_init = MemoryUsage::undefined_size();
 756     }
 757     if (has_undefined_max_size) {
 758       total_max = MemoryUsage::undefined_size();
 759     }
 760 
 761     usage = MemoryUsage(total_init, total_used, total_committed, total_max);
 762   }
 763 
 764   Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 765   return JNIHandles::make_local(env, obj());
 766 JVM_END
 767 
 768 // Returns the boolean value of a given attribute.
 769 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
 770   switch (att) {
 771   case JMM_VERBOSE_GC:
 772     return MemoryService::get_verbose();
 773   case JMM_VERBOSE_CLASS:
 774     return ClassLoadingService::get_verbose();
 775   case JMM_THREAD_CONTENTION_MONITORING:
 776     return ThreadService::is_thread_monitoring_contention();
 777   case JMM_THREAD_CPU_TIME:
 778     return ThreadService::is_thread_cpu_time_enabled();
 779   case JMM_THREAD_ALLOCATED_MEMORY:
 780     return ThreadService::is_thread_allocated_memory_enabled();
 781   default:
 782     assert(0, "Unrecognized attribute");
 783     return false;
 784   }
 785 JVM_END
 786 
 787 // Sets the given boolean attribute and returns the previous value.
 788 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
 789   switch (att) {
 790   case JMM_VERBOSE_GC:
 791     return MemoryService::set_verbose(flag != 0);
 792   case JMM_VERBOSE_CLASS:
 793     return ClassLoadingService::set_verbose(flag != 0);
 794   case JMM_THREAD_CONTENTION_MONITORING:
 795     return ThreadService::set_thread_monitoring_contention(flag != 0);
 796   case JMM_THREAD_CPU_TIME:
 797     return ThreadService::set_thread_cpu_time_enabled(flag != 0);
 798   case JMM_THREAD_ALLOCATED_MEMORY:
 799     return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
 800   default:
 801     assert(0, "Unrecognized attribute");
 802     return false;
 803   }
 804 JVM_END
 805 
 806 
 807 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
 808   switch (att) {
 809   case JMM_GC_TIME_MS:
 810     return mgr->gc_time_ms();
 811 
 812   case JMM_GC_COUNT:
 813     return mgr->gc_count();
 814 
 815   case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
 816     // current implementation only has 1 ext attribute
 817     return 1;
 818 
 819   default:
 820     assert(0, "Unrecognized GC attribute");
 821     return -1;
 822   }
 823 }
 824 
 825 class VmThreadCountClosure: public ThreadClosure {
 826  private:
 827   int _count;
 828  public:
 829   VmThreadCountClosure() : _count(0) {};
 830   void do_thread(Thread* thread);
 831   int count() { return _count; }
 832 };
 833 
 834 void VmThreadCountClosure::do_thread(Thread* thread) {
 835   // exclude externally visible JavaThreads
 836   if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
 837     return;
 838   }
 839 
 840   _count++;
 841 }
 842 
 843 static jint get_vm_thread_count() {
 844   VmThreadCountClosure vmtcc;
 845   {
 846     MutexLockerEx ml(Threads_lock);
 847     Threads::threads_do(&vmtcc);
 848   }
 849 
 850   return vmtcc.count();
 851 }
 852 
 853 static jint get_num_flags() {
 854   // last flag entry is always NULL, so subtract 1
 855   int nFlags = (int) JVMFlag::numFlags - 1;
 856   int count = 0;
 857   for (int i = 0; i < nFlags; i++) {
 858     JVMFlag* flag = &JVMFlag::flags[i];
 859     // Exclude the locked (diagnostic, experimental) flags
 860     if (flag->is_unlocked() || flag->is_unlocker()) {
 861       count++;
 862     }
 863   }
 864   return count;
 865 }
 866 
 867 static jlong get_long_attribute(jmmLongAttribute att) {
 868   switch (att) {
 869   case JMM_CLASS_LOADED_COUNT:
 870     return ClassLoadingService::loaded_class_count();
 871 
 872   case JMM_CLASS_UNLOADED_COUNT:
 873     return ClassLoadingService::unloaded_class_count();
 874 
 875   case JMM_THREAD_TOTAL_COUNT:
 876     return ThreadService::get_total_thread_count();
 877 
 878   case JMM_THREAD_LIVE_COUNT:
 879     return ThreadService::get_live_thread_count();
 880 
 881   case JMM_THREAD_PEAK_COUNT:
 882     return ThreadService::get_peak_thread_count();
 883 
 884   case JMM_THREAD_DAEMON_COUNT:
 885     return ThreadService::get_daemon_thread_count();
 886 
 887   case JMM_JVM_INIT_DONE_TIME_MS:
 888     return Management::vm_init_done_time();
 889 
 890   case JMM_JVM_UPTIME_MS:
 891     return Management::ticks_to_ms(os::elapsed_counter());
 892 
 893   case JMM_COMPILE_TOTAL_TIME_MS:
 894     return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
 895 
 896   case JMM_OS_PROCESS_ID:
 897     return os::current_process_id();
 898 
 899   // Hotspot-specific counters
 900   case JMM_CLASS_LOADED_BYTES:
 901     return ClassLoadingService::loaded_class_bytes();
 902 
 903   case JMM_CLASS_UNLOADED_BYTES:
 904     return ClassLoadingService::unloaded_class_bytes();
 905 
 906   case JMM_SHARED_CLASS_LOADED_COUNT:
 907     return ClassLoadingService::loaded_shared_class_count();
 908 
 909   case JMM_SHARED_CLASS_UNLOADED_COUNT:
 910     return ClassLoadingService::unloaded_shared_class_count();
 911 
 912 
 913   case JMM_SHARED_CLASS_LOADED_BYTES:
 914     return ClassLoadingService::loaded_shared_class_bytes();
 915 
 916   case JMM_SHARED_CLASS_UNLOADED_BYTES:
 917     return ClassLoadingService::unloaded_shared_class_bytes();
 918 
 919   case JMM_TOTAL_CLASSLOAD_TIME_MS:
 920     return ClassLoader::classloader_time_ms();
 921 
 922   case JMM_VM_GLOBAL_COUNT:
 923     return get_num_flags();
 924 
 925   case JMM_SAFEPOINT_COUNT:
 926     return RuntimeService::safepoint_count();
 927 
 928   case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
 929     return RuntimeService::safepoint_sync_time_ms();
 930 
 931   case JMM_TOTAL_STOPPED_TIME_MS:
 932     return RuntimeService::safepoint_time_ms();
 933 
 934   case JMM_TOTAL_APP_TIME_MS:
 935     return RuntimeService::application_time_ms();
 936 
 937   case JMM_VM_THREAD_COUNT:
 938     return get_vm_thread_count();
 939 
 940   case JMM_CLASS_INIT_TOTAL_COUNT:
 941     return ClassLoader::class_init_count();
 942 
 943   case JMM_CLASS_INIT_TOTAL_TIME_MS:
 944     return ClassLoader::class_init_time_ms();
 945 
 946   case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
 947     return ClassLoader::class_verify_time_ms();
 948 
 949   case JMM_METHOD_DATA_SIZE_BYTES:
 950     return ClassLoadingService::class_method_data_size();
 951 
 952   case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
 953     return os::physical_memory();
 954 
 955   default:
 956     return -1;
 957   }
 958 }
 959 
 960 
 961 // Returns the long value of a given attribute.
 962 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
 963   if (obj == NULL) {
 964     return get_long_attribute(att);
 965   } else {
 966     GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
 967     if (mgr != NULL) {
 968       return get_gc_attribute(mgr, att);
 969     }
 970   }
 971   return -1;
 972 JVM_END
 973 
 974 // Gets the value of all attributes specified in the given array
 975 // and sets the value in the result array.
 976 // Returns the number of attributes found.
 977 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
 978                                       jobject obj,
 979                                       jmmLongAttribute* atts,
 980                                       jint count,
 981                                       jlong* result))
 982 
 983   int num_atts = 0;
 984   if (obj == NULL) {
 985     for (int i = 0; i < count; i++) {
 986       result[i] = get_long_attribute(atts[i]);
 987       if (result[i] != -1) {
 988         num_atts++;
 989       }
 990     }
 991   } else {
 992     GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
 993     for (int i = 0; i < count; i++) {
 994       result[i] = get_gc_attribute(mgr, atts[i]);
 995       if (result[i] != -1) {
 996         num_atts++;
 997       }
 998     }
 999   }
1000   return num_atts;
1001 JVM_END
1002 
1003 // Helper function to do thread dump for a specific list of threads
1004 static void do_thread_dump(ThreadDumpResult* dump_result,
1005                            typeArrayHandle ids_ah,  // array of thread ID (long[])
1006                            int num_threads,
1007                            int max_depth,
1008                            bool with_locked_monitors,
1009                            bool with_locked_synchronizers,
1010                            TRAPS) {
1011   // no need to actually perform thread dump if no TIDs are specified
1012   if (num_threads == 0) return;
1013 
1014   // First get an array of threadObj handles.
1015   // A JavaThread may terminate before we get the stack trace.
1016   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1017 
1018   {
1019     // Need this ThreadsListHandle for converting Java thread IDs into
1020     // threadObj handles; dump_result->set_t_list() is called in the
1021     // VM op below so we can't use it yet.
1022     ThreadsListHandle tlh;
1023     for (int i = 0; i < num_threads; i++) {
1024       jlong tid = ids_ah->long_at(i);
1025       JavaThread* jt = tlh.list()->find_JavaThread_from_java_tid(tid);
1026       oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1027       instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1028       thread_handle_array->append(threadObj_h);
1029     }
1030   }
1031 
1032   // Obtain thread dumps and thread snapshot information
1033   VM_ThreadDump op(dump_result,
1034                    thread_handle_array,
1035                    num_threads,
1036                    max_depth, /* stack depth */
1037                    with_locked_monitors,
1038                    with_locked_synchronizers);
1039   VMThread::execute(&op);
1040 }
1041 
1042 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1043 // for the thread ID specified in the corresponding entry in
1044 // the given array of thread IDs; or NULL if the thread does not exist
1045 // or has terminated.
1046 //
1047 // Input parameters:
1048 //   ids       - array of thread IDs
1049 //   maxDepth  - the maximum depth of stack traces to be dumped:
1050 //               maxDepth == -1 requests to dump entire stack trace.
1051 //               maxDepth == 0  requests no stack trace.
1052 //   infoArray - array of ThreadInfo objects
1053 //
1054 // QQQ - Why does this method return a value instead of void?
1055 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1056   // Check if threads is null
1057   if (ids == NULL || infoArray == NULL) {
1058     THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1059   }
1060 
1061   if (maxDepth < -1) {
1062     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1063                "Invalid maxDepth", -1);
1064   }
1065 
1066   ResourceMark rm(THREAD);
1067   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1068   typeArrayHandle ids_ah(THREAD, ta);
1069 
1070   oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1071   objArrayOop oa = objArrayOop(infoArray_obj);
1072   objArrayHandle infoArray_h(THREAD, oa);
1073 
1074   // validate the thread id array
1075   validate_thread_id_array(ids_ah, CHECK_0);
1076 
1077   // validate the ThreadInfo[] parameters
1078   validate_thread_info_array(infoArray_h, CHECK_0);
1079 
1080   // infoArray must be of the same length as the given array of thread IDs
1081   int num_threads = ids_ah->length();
1082   if (num_threads != infoArray_h->length()) {
1083     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1084                "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1085   }
1086 
1087   // Must use ThreadDumpResult to store the ThreadSnapshot.
1088   // GC may occur after the thread snapshots are taken but before
1089   // this function returns. The threadObj and other oops kept
1090   // in the ThreadSnapshot are marked and adjusted during GC.
1091   ThreadDumpResult dump_result(num_threads);
1092 
1093   if (maxDepth == 0) {
1094     // No stack trace to dump so we do not need to stop the world.
1095     // Since we never do the VM op here we must set the threads list.
1096     dump_result.set_t_list();
1097     for (int i = 0; i < num_threads; i++) {
1098       jlong tid = ids_ah->long_at(i);
1099       JavaThread* jt = dump_result.t_list()->find_JavaThread_from_java_tid(tid);
1100       ThreadSnapshot* ts;
1101       if (jt == NULL) {
1102         // if the thread does not exist or now it is terminated,
1103         // create dummy snapshot
1104         ts = new ThreadSnapshot();
1105       } else {
1106         ts = new ThreadSnapshot(dump_result.t_list(), jt);
1107       }
1108       dump_result.add_thread_snapshot(ts);
1109     }
1110   } else {
1111     // obtain thread dump with the specific list of threads with stack trace
1112     do_thread_dump(&dump_result,
1113                    ids_ah,
1114                    num_threads,
1115                    maxDepth,
1116                    false, /* no locked monitor */
1117                    false, /* no locked synchronizers */
1118                    CHECK_0);
1119   }
1120 
1121   int num_snapshots = dump_result.num_snapshots();
1122   assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1123   assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1124   int index = 0;
1125   for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1126     // For each thread, create an java/lang/management/ThreadInfo object
1127     // and fill with the thread information
1128 
1129     if (ts->threadObj() == NULL) {
1130      // if the thread does not exist or now it is terminated, set threadinfo to NULL
1131       infoArray_h->obj_at_put(index, NULL);
1132       continue;
1133     }
1134 
1135     // Create java.lang.management.ThreadInfo object
1136     instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1137     infoArray_h->obj_at_put(index, info_obj);
1138   }
1139   return 0;
1140 JVM_END
1141 
1142 // Dump thread info for the specified threads.
1143 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1144 // for the thread ID specified in the corresponding entry in
1145 // the given array of thread IDs; or NULL if the thread does not exist
1146 // or has terminated.
1147 //
1148 // Input parameter:
1149 //    ids - array of thread IDs; NULL indicates all live threads
1150 //    locked_monitors - if true, dump locked object monitors
1151 //    locked_synchronizers - if true, dump locked JSR-166 synchronizers
1152 //
1153 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors,
1154                                         jboolean locked_synchronizers, jint maxDepth))
1155   ResourceMark rm(THREAD);
1156 
1157   typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1158   int num_threads = (ta != NULL ? ta->length() : 0);
1159   typeArrayHandle ids_ah(THREAD, ta);
1160 
1161   ThreadDumpResult dump_result(num_threads);  // can safepoint
1162 
1163   if (ids_ah() != NULL) {
1164 
1165     // validate the thread id array
1166     validate_thread_id_array(ids_ah, CHECK_NULL);
1167 
1168     // obtain thread dump of a specific list of threads
1169     do_thread_dump(&dump_result,
1170                    ids_ah,
1171                    num_threads,
1172                    maxDepth, /* stack depth */
1173                    (locked_monitors ? true : false),      /* with locked monitors */
1174                    (locked_synchronizers ? true : false), /* with locked synchronizers */
1175                    CHECK_NULL);
1176   } else {
1177     // obtain thread dump of all threads
1178     VM_ThreadDump op(&dump_result,
1179                      maxDepth, /* stack depth */
1180                      (locked_monitors ? true : false),     /* with locked monitors */
1181                      (locked_synchronizers ? true : false) /* with locked synchronizers */);
1182     VMThread::execute(&op);
1183   }
1184 
1185   int num_snapshots = dump_result.num_snapshots();
1186   assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1187 
1188   // create the result ThreadInfo[] object
1189   InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1190   objArrayOop r = oopFactory::new_objArray(ik, num_snapshots, CHECK_NULL);
1191   objArrayHandle result_h(THREAD, r);
1192 
1193   int index = 0;
1194   for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1195     if (ts->threadObj() == NULL) {
1196      // if the thread does not exist or now it is terminated, set threadinfo to NULL
1197       result_h->obj_at_put(index, NULL);
1198       continue;
1199     }
1200 
1201     ThreadStackTrace* stacktrace = ts->get_stack_trace();
1202     assert(stacktrace != NULL, "Must have a stack trace dumped");
1203 
1204     // Create Object[] filled with locked monitors
1205     // Create int[] filled with the stack depth where a monitor was locked
1206     int num_frames = stacktrace->get_stack_depth();
1207     int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1208 
1209     // Count the total number of locked monitors
1210     for (int i = 0; i < num_frames; i++) {
1211       StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1212       num_locked_monitors += frame->num_locked_monitors();
1213     }
1214 
1215     objArrayHandle monitors_array;
1216     typeArrayHandle depths_array;
1217     objArrayHandle synchronizers_array;
1218 
1219     if (locked_monitors) {
1220       // Constructs Object[] and int[] to contain the object monitor and the stack depth
1221       // where the thread locked it
1222       objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1223       objArrayHandle mh(THREAD, array);
1224       monitors_array = mh;
1225 
1226       typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1227       typeArrayHandle dh(THREAD, tarray);
1228       depths_array = dh;
1229 
1230       int count = 0;
1231       int j = 0;
1232       for (int depth = 0; depth < num_frames; depth++) {
1233         StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1234         int len = frame->num_locked_monitors();
1235         GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1236         for (j = 0; j < len; j++) {
1237           oop monitor = locked_monitors->at(j);
1238           assert(monitor != NULL, "must be a Java object");
1239           monitors_array->obj_at_put(count, monitor);
1240           depths_array->int_at_put(count, depth);
1241           count++;
1242         }
1243       }
1244 
1245       GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1246       for (j = 0; j < jni_locked_monitors->length(); j++) {
1247         oop object = jni_locked_monitors->at(j);
1248         assert(object != NULL, "must be a Java object");
1249         monitors_array->obj_at_put(count, object);
1250         // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1251         depths_array->int_at_put(count, -1);
1252         count++;
1253       }
1254       assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1255     }
1256 
1257     if (locked_synchronizers) {
1258       // Create Object[] filled with locked JSR-166 synchronizers
1259       assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1260       ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1261       GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1262       int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1263 
1264       objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1265       objArrayHandle sh(THREAD, array);
1266       synchronizers_array = sh;
1267 
1268       for (int k = 0; k < num_locked_synchronizers; k++) {
1269         synchronizers_array->obj_at_put(k, locks->at(k));
1270       }
1271     }
1272 
1273     // Create java.lang.management.ThreadInfo object
1274     instanceOop info_obj = Management::create_thread_info_instance(ts,
1275                                                                    monitors_array,
1276                                                                    depths_array,
1277                                                                    synchronizers_array,
1278                                                                    CHECK_NULL);
1279     result_h->obj_at_put(index, info_obj);
1280   }
1281 
1282   return (jobjectArray) JNIHandles::make_local(env, result_h());
1283 JVM_END
1284 
1285 // Reset statistic.  Return true if the requested statistic is reset.
1286 // Otherwise, return false.
1287 //
1288 // Input parameters:
1289 //  obj  - specify which instance the statistic associated with to be reset
1290 //         For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1291 //         For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1292 //  type - the type of statistic to be reset
1293 //
1294 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1295   ResourceMark rm(THREAD);
1296 
1297   switch (type) {
1298     case JMM_STAT_PEAK_THREAD_COUNT:
1299       ThreadService::reset_peak_thread_count();
1300       return true;
1301 
1302     case JMM_STAT_THREAD_CONTENTION_COUNT:
1303     case JMM_STAT_THREAD_CONTENTION_TIME: {
1304       jlong tid = obj.j;
1305       if (tid < 0) {
1306         THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1307       }
1308 
1309       // Look for the JavaThread of this given tid
1310       JavaThreadIteratorWithHandle jtiwh;
1311       if (tid == 0) {
1312         // reset contention statistics for all threads if tid == 0
1313         for (; JavaThread *java_thread = jtiwh.next(); ) {
1314           if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1315             ThreadService::reset_contention_count_stat(java_thread);
1316           } else {
1317             ThreadService::reset_contention_time_stat(java_thread);
1318           }
1319         }
1320       } else {
1321         // reset contention statistics for a given thread
1322         JavaThread* java_thread = jtiwh.list()->find_JavaThread_from_java_tid(tid);
1323         if (java_thread == NULL) {
1324           return false;
1325         }
1326 
1327         if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1328           ThreadService::reset_contention_count_stat(java_thread);
1329         } else {
1330           ThreadService::reset_contention_time_stat(java_thread);
1331         }
1332       }
1333       return true;
1334       break;
1335     }
1336     case JMM_STAT_PEAK_POOL_USAGE: {
1337       jobject o = obj.l;
1338       if (o == NULL) {
1339         THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1340       }
1341 
1342       oop pool_obj = JNIHandles::resolve(o);
1343       assert(pool_obj->is_instance(), "Should be an instanceOop");
1344       instanceHandle ph(THREAD, (instanceOop) pool_obj);
1345 
1346       MemoryPool* pool = MemoryService::get_memory_pool(ph);
1347       if (pool != NULL) {
1348         pool->reset_peak_memory_usage();
1349         return true;
1350       }
1351       break;
1352     }
1353     case JMM_STAT_GC_STAT: {
1354       jobject o = obj.l;
1355       if (o == NULL) {
1356         THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1357       }
1358 
1359       GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1360       if (mgr != NULL) {
1361         mgr->reset_gc_stat();
1362         return true;
1363       }
1364       break;
1365     }
1366     default:
1367       assert(0, "Unknown Statistic Type");
1368   }
1369   return false;
1370 JVM_END
1371 
1372 // Returns the fast estimate of CPU time consumed by
1373 // a given thread (in nanoseconds).
1374 // If thread_id == 0, return CPU time for the current thread.
1375 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1376   if (!os::is_thread_cpu_time_supported()) {
1377     return -1;
1378   }
1379 
1380   if (thread_id < 0) {
1381     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1382                "Invalid thread ID", -1);
1383   }
1384 
1385   JavaThread* java_thread = NULL;
1386   if (thread_id == 0) {
1387     // current thread
1388     return os::current_thread_cpu_time();
1389   } else {
1390     ThreadsListHandle tlh;
1391     java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
1392     if (java_thread != NULL) {
1393       return os::thread_cpu_time((Thread*) java_thread);
1394     }
1395   }
1396   return -1;
1397 JVM_END
1398 
1399 // Returns a String array of all VM global flag names
1400 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1401   // last flag entry is always NULL, so subtract 1
1402   int nFlags = (int) JVMFlag::numFlags - 1;
1403   // allocate a temp array
1404   objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1405                                            nFlags, CHECK_0);
1406   objArrayHandle flags_ah(THREAD, r);
1407   int num_entries = 0;
1408   for (int i = 0; i < nFlags; i++) {
1409     JVMFlag* flag = &JVMFlag::flags[i];
1410     // Exclude notproduct and develop flags in product builds.
1411     if (flag->is_constant_in_binary()) {
1412       continue;
1413     }
1414     // Exclude the locked (experimental, diagnostic) flags
1415     if (flag->is_unlocked() || flag->is_unlocker()) {
1416       Handle s = java_lang_String::create_from_str(flag->_name, CHECK_0);
1417       flags_ah->obj_at_put(num_entries, s());
1418       num_entries++;
1419     }
1420   }
1421 
1422   if (num_entries < nFlags) {
1423     // Return array of right length
1424     objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1425     for(int i = 0; i < num_entries; i++) {
1426       res->obj_at_put(i, flags_ah->obj_at(i));
1427     }
1428     return (jobjectArray)JNIHandles::make_local(env, res);
1429   }
1430 
1431   return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1432 JVM_END
1433 
1434 // Utility function used by jmm_GetVMGlobals.  Returns false if flag type
1435 // can't be determined, true otherwise.  If false is returned, then *global
1436 // will be incomplete and invalid.
1437 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, JVMFlag *flag, TRAPS) {
1438   Handle flag_name;
1439   if (name() == NULL) {
1440     flag_name = java_lang_String::create_from_str(flag->_name, CHECK_false);
1441   } else {
1442     flag_name = name;
1443   }
1444   global->name = (jstring)JNIHandles::make_local(env, flag_name());
1445 
1446   if (flag->is_bool()) {
1447     global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1448     global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1449   } else if (flag->is_int()) {
1450     global->value.j = (jlong)flag->get_int();
1451     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1452   } else if (flag->is_uint()) {
1453     global->value.j = (jlong)flag->get_uint();
1454     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1455   } else if (flag->is_intx()) {
1456     global->value.j = (jlong)flag->get_intx();
1457     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1458   } else if (flag->is_uintx()) {
1459     global->value.j = (jlong)flag->get_uintx();
1460     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1461   } else if (flag->is_uint64_t()) {
1462     global->value.j = (jlong)flag->get_uint64_t();
1463     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1464   } else if (flag->is_double()) {
1465     global->value.d = (jdouble)flag->get_double();
1466     global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1467   } else if (flag->is_size_t()) {
1468     global->value.j = (jlong)flag->get_size_t();
1469     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1470   } else if (flag->is_ccstr()) {
1471     Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1472     global->value.l = (jobject)JNIHandles::make_local(env, str());
1473     global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1474   } else {
1475     global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1476     return false;
1477   }
1478 
1479   global->writeable = flag->is_writeable();
1480   global->external = flag->is_external();
1481   switch (flag->get_origin()) {
1482     case JVMFlag::DEFAULT:
1483       global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1484       break;
1485     case JVMFlag::COMMAND_LINE:
1486       global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1487       break;
1488     case JVMFlag::ENVIRON_VAR:
1489       global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1490       break;
1491     case JVMFlag::CONFIG_FILE:
1492       global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1493       break;
1494     case JVMFlag::MANAGEMENT:
1495       global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1496       break;
1497     case JVMFlag::ERGONOMIC:
1498       global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1499       break;
1500     case JVMFlag::ATTACH_ON_DEMAND:
1501       global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1502       break;
1503     default:
1504       global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1505   }
1506 
1507   return true;
1508 }
1509 
1510 // Fill globals array of count length with jmmVMGlobal entries
1511 // specified by names. If names == NULL, fill globals array
1512 // with all Flags. Return value is number of entries
1513 // created in globals.
1514 // If a JVMFlag with a given name in an array element does not
1515 // exist, globals[i].name will be set to NULL.
1516 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1517                                  jobjectArray names,
1518                                  jmmVMGlobal *globals,
1519                                  jint count))
1520 
1521 
1522   if (globals == NULL) {
1523     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1524   }
1525 
1526   ResourceMark rm(THREAD);
1527 
1528   if (names != NULL) {
1529     // return the requested globals
1530     objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1531     objArrayHandle names_ah(THREAD, ta);
1532     // Make sure we have a String array
1533     Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1534     if (element_klass != SystemDictionary::String_klass()) {
1535       THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1536                  "Array element type is not String class", 0);
1537     }
1538 
1539     int names_length = names_ah->length();
1540     int num_entries = 0;
1541     for (int i = 0; i < names_length && i < count; i++) {
1542       oop s = names_ah->obj_at(i);
1543       if (s == NULL) {
1544         THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1545       }
1546 
1547       Handle sh(THREAD, s);
1548       char* str = java_lang_String::as_utf8_string(s);
1549       JVMFlag* flag = JVMFlag::find_flag(str, strlen(str));
1550       if (flag != NULL &&
1551           add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1552         num_entries++;
1553       } else {
1554         globals[i].name = NULL;
1555       }
1556     }
1557     return num_entries;
1558   } else {
1559     // return all globals if names == NULL
1560 
1561     // last flag entry is always NULL, so subtract 1
1562     int nFlags = (int) JVMFlag::numFlags - 1;
1563     Handle null_h;
1564     int num_entries = 0;
1565     for (int i = 0; i < nFlags && num_entries < count;  i++) {
1566       JVMFlag* flag = &JVMFlag::flags[i];
1567       // Exclude notproduct and develop flags in product builds.
1568       if (flag->is_constant_in_binary()) {
1569         continue;
1570       }
1571       // Exclude the locked (diagnostic, experimental) flags
1572       if ((flag->is_unlocked() || flag->is_unlocker()) &&
1573           add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1574         num_entries++;
1575       }
1576     }
1577     return num_entries;
1578   }
1579 JVM_END
1580 
1581 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1582   ResourceMark rm(THREAD);
1583 
1584   oop fn = JNIHandles::resolve_external_guard(flag_name);
1585   if (fn == NULL) {
1586     THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1587               "The flag name cannot be null.");
1588   }
1589   char* name = java_lang_String::as_utf8_string(fn);
1590 
1591   FormatBuffer<80> error_msg("%s", "");
1592   int succeed = WriteableFlags::set_flag(name, new_value, JVMFlag::MANAGEMENT, error_msg);
1593 
1594   if (succeed != JVMFlag::SUCCESS) {
1595     if (succeed == JVMFlag::MISSING_VALUE) {
1596       // missing value causes NPE to be thrown
1597       THROW(vmSymbols::java_lang_NullPointerException());
1598     } else {
1599       // all the other errors are reported as IAE with the appropriate error message
1600       THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1601                 error_msg.buffer());
1602     }
1603   }
1604   assert(succeed == JVMFlag::SUCCESS, "Setting flag should succeed");
1605 JVM_END
1606 
1607 class ThreadTimesClosure: public ThreadClosure {
1608  private:
1609   objArrayHandle _names_strings;
1610   char **_names_chars;
1611   typeArrayHandle _times;
1612   int _names_len;
1613   int _times_len;
1614   int _count;
1615 
1616  public:
1617   ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1618   ~ThreadTimesClosure();
1619   virtual void do_thread(Thread* thread);
1620   void do_unlocked();
1621   int count() { return _count; }
1622 };
1623 
1624 ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1625                                        typeArrayHandle times) {
1626   assert(names() != NULL, "names was NULL");
1627   assert(times() != NULL, "times was NULL");
1628   _names_strings = names;
1629   _names_len = names->length();
1630   _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1631   _times = times;
1632   _times_len = times->length();
1633   _count = 0;
1634 }
1635 
1636 //
1637 // Called with Threads_lock held
1638 //
1639 void ThreadTimesClosure::do_thread(Thread* thread) {
1640   assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
1641   assert(thread != NULL, "thread was NULL");
1642 
1643   // exclude externally visible JavaThreads
1644   if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1645     return;
1646   }
1647 
1648   if (_count >= _names_len || _count >= _times_len) {
1649     // skip if the result array is not big enough
1650     return;
1651   }
1652 
1653   EXCEPTION_MARK;
1654   ResourceMark rm(THREAD); // thread->name() uses ResourceArea
1655 
1656   assert(thread->name() != NULL, "All threads should have a name");
1657   _names_chars[_count] = os::strdup(thread->name());
1658   _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1659                         os::thread_cpu_time(thread) : -1);
1660   _count++;
1661 }
1662 
1663 // Called without Threads_lock, we can allocate String objects.
1664 void ThreadTimesClosure::do_unlocked() {
1665 
1666   EXCEPTION_MARK;
1667   for (int i = 0; i < _count; i++) {
1668     Handle s = java_lang_String::create_from_str(_names_chars[i],  CHECK);
1669     _names_strings->obj_at_put(i, s());
1670   }
1671 }
1672 
1673 ThreadTimesClosure::~ThreadTimesClosure() {
1674   for (int i = 0; i < _count; i++) {
1675     os::free(_names_chars[i]);
1676   }
1677   FREE_C_HEAP_ARRAY(char *, _names_chars);
1678 }
1679 
1680 // Fills names with VM internal thread names and times with the corresponding
1681 // CPU times.  If names or times is NULL, a NullPointerException is thrown.
1682 // If the element type of names is not String, an IllegalArgumentException is
1683 // thrown.
1684 // If an array is not large enough to hold all the entries, only the entries
1685 // that fit will be returned.  Return value is the number of VM internal
1686 // threads entries.
1687 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1688                                            jobjectArray names,
1689                                            jlongArray times))
1690   if (names == NULL || times == NULL) {
1691      THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1692   }
1693   objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1694   objArrayHandle names_ah(THREAD, na);
1695 
1696   // Make sure we have a String array
1697   Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1698   if (element_klass != SystemDictionary::String_klass()) {
1699     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1700                "Array element type is not String class", 0);
1701   }
1702 
1703   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1704   typeArrayHandle times_ah(THREAD, ta);
1705 
1706   ThreadTimesClosure ttc(names_ah, times_ah);
1707   {
1708     MutexLockerEx ml(Threads_lock);
1709     Threads::threads_do(&ttc);
1710   }
1711   ttc.do_unlocked();
1712   return ttc.count();
1713 JVM_END
1714 
1715 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1716   ResourceMark rm(THREAD);
1717 
1718   VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1719   VMThread::execute(&op);
1720 
1721   DeadlockCycle* deadlocks = op.result();
1722   if (deadlocks == NULL) {
1723     // no deadlock found and return
1724     return Handle();
1725   }
1726 
1727   int num_threads = 0;
1728   DeadlockCycle* cycle;
1729   for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1730     num_threads += cycle->num_threads();
1731   }
1732 
1733   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1734   objArrayHandle threads_ah(THREAD, r);
1735 
1736   int index = 0;
1737   for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1738     GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1739     int len = deadlock_threads->length();
1740     for (int i = 0; i < len; i++) {
1741       threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1742       index++;
1743     }
1744   }
1745   return threads_ah;
1746 }
1747 
1748 // Finds cycles of threads that are deadlocked involved in object monitors
1749 // and JSR-166 synchronizers.
1750 // Returns an array of Thread objects which are in deadlock, if any.
1751 // Otherwise, returns NULL.
1752 //
1753 // Input parameter:
1754 //    object_monitors_only - if true, only check object monitors
1755 //
1756 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1757   Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1758   return (jobjectArray) JNIHandles::make_local(env, result());
1759 JVM_END
1760 
1761 // Finds cycles of threads that are deadlocked on monitor locks
1762 // Returns an array of Thread objects which are in deadlock, if any.
1763 // Otherwise, returns NULL.
1764 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1765   Handle result = find_deadlocks(true, CHECK_0);
1766   return (jobjectArray) JNIHandles::make_local(env, result());
1767 JVM_END
1768 
1769 // Gets the information about GC extension attributes including
1770 // the name of the attribute, its type, and a short description.
1771 //
1772 // Input parameters:
1773 //   mgr   - GC memory manager
1774 //   info  - caller allocated array of jmmExtAttributeInfo
1775 //   count - number of elements of the info array
1776 //
1777 // Returns the number of GC extension attributes filled in the info array; or
1778 // -1 if info is not big enough
1779 //
1780 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1781   // All GC memory managers have 1 attribute (number of GC threads)
1782   if (count == 0) {
1783     return 0;
1784   }
1785 
1786   if (info == NULL) {
1787    THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1788   }
1789 
1790   info[0].name = "GcThreadCount";
1791   info[0].type = 'I';
1792   info[0].description = "Number of GC threads";
1793   return 1;
1794 JVM_END
1795 
1796 // verify the given array is an array of java/lang/management/MemoryUsage objects
1797 // of a given length and return the objArrayOop
1798 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1799   if (array == NULL) {
1800     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1801   }
1802 
1803   objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1804   objArrayHandle array_h(THREAD, oa);
1805 
1806   // array must be of the given length
1807   if (length != array_h->length()) {
1808     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1809                "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1810   }
1811 
1812   // check if the element of array is of type MemoryUsage class
1813   Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1814   Klass* element_klass = ObjArrayKlass::cast(array_h->klass())->element_klass();
1815   if (element_klass != usage_klass) {
1816     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1817                "The element type is not MemoryUsage class", 0);
1818   }
1819 
1820   return array_h();
1821 }
1822 
1823 // Gets the statistics of the last GC of a given GC memory manager.
1824 // Input parameters:
1825 //   obj     - GarbageCollectorMXBean object
1826 //   gc_stat - caller allocated jmmGCStat where:
1827 //     a. before_gc_usage - array of MemoryUsage objects
1828 //     b. after_gc_usage  - array of MemoryUsage objects
1829 //     c. gc_ext_attributes_values_size is set to the
1830 //        gc_ext_attribute_values array allocated
1831 //     d. gc_ext_attribute_values is a caller allocated array of jvalue.
1832 //
1833 // On return,
1834 //   gc_index == 0 indicates no GC statistics available
1835 //
1836 //   before_gc_usage and after_gc_usage - filled with per memory pool
1837 //      before and after GC usage in the same order as the memory pools
1838 //      returned by GetMemoryPools for a given GC memory manager.
1839 //   num_gc_ext_attributes indicates the number of elements in
1840 //      the gc_ext_attribute_values array is filled; or
1841 //      -1 if the gc_ext_attributes_values array is not big enough
1842 //
1843 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
1844   ResourceMark rm(THREAD);
1845 
1846   if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
1847     THROW(vmSymbols::java_lang_NullPointerException());
1848   }
1849 
1850   // Get the GCMemoryManager
1851   GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1852 
1853   // Make a copy of the last GC statistics
1854   // GC may occur while constructing the last GC information
1855   int num_pools = MemoryService::num_memory_pools();
1856   GCStatInfo stat(num_pools);
1857   if (mgr->get_last_gc_stat(&stat) == 0) {
1858     gc_stat->gc_index = 0;
1859     return;
1860   }
1861 
1862   gc_stat->gc_index = stat.gc_index();
1863   gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
1864   gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
1865 
1866   // Current implementation does not have GC extension attributes
1867   gc_stat->num_gc_ext_attributes = 0;
1868 
1869   // Fill the arrays of MemoryUsage objects with before and after GC
1870   // per pool memory usage
1871   objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
1872                                              num_pools,
1873                                              CHECK);
1874   objArrayHandle usage_before_gc_ah(THREAD, bu);
1875 
1876   objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
1877                                              num_pools,
1878                                              CHECK);
1879   objArrayHandle usage_after_gc_ah(THREAD, au);
1880 
1881   for (int i = 0; i < num_pools; i++) {
1882     Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
1883     Handle after_usage;
1884 
1885     MemoryUsage u = stat.after_gc_usage_for_pool(i);
1886     if (u.max_size() == 0 && u.used() > 0) {
1887       // If max size == 0, this pool is a survivor space.
1888       // Set max size = -1 since the pools will be swapped after GC.
1889       MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
1890       after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
1891     } else {
1892       after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
1893     }
1894     usage_before_gc_ah->obj_at_put(i, before_usage());
1895     usage_after_gc_ah->obj_at_put(i, after_usage());
1896   }
1897 
1898   if (gc_stat->gc_ext_attribute_values_size > 0) {
1899     // Current implementation only has 1 attribute (number of GC threads)
1900     // The type is 'I'
1901     gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
1902   }
1903 JVM_END
1904 
1905 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
1906   ResourceMark rm(THREAD);
1907   // Get the GCMemoryManager
1908   GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1909   mgr->set_notification_enabled(enabled?true:false);
1910 JVM_END
1911 
1912 // Dump heap - Returns 0 if succeeds.
1913 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
1914 #if INCLUDE_SERVICES
1915   ResourceMark rm(THREAD);
1916   oop on = JNIHandles::resolve_external_guard(outputfile);
1917   if (on == NULL) {
1918     THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1919                "Output file name cannot be null.", -1);
1920   }
1921   Handle onhandle(THREAD, on);
1922   char* name = java_lang_String::as_platform_dependent_str(onhandle, CHECK_(-1));
1923   if (name == NULL) {
1924     THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1925                "Output file name cannot be null.", -1);
1926   }
1927   HeapDumper dumper(live ? true : false);
1928   if (dumper.dump(name) != 0) {
1929     const char* errmsg = dumper.error_as_C_string();
1930     THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1931   }
1932   return 0;
1933 #else  // INCLUDE_SERVICES
1934   return -1;
1935 #endif // INCLUDE_SERVICES
1936 JVM_END
1937 
1938 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1939   ResourceMark rm(THREAD);
1940   GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1941   objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
1942           dcmd_list->length(), CHECK_NULL);
1943   objArrayHandle cmd_array(THREAD, cmd_array_oop);
1944   for (int i = 0; i < dcmd_list->length(); i++) {
1945     oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1946     cmd_array->obj_at_put(i, cmd_name);
1947   }
1948   return (jobjectArray) JNIHandles::make_local(env, cmd_array());
1949 JVM_END
1950 
1951 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1952           dcmdInfo* infoArray))
1953   if (cmds == NULL || infoArray == NULL) {
1954     THROW(vmSymbols::java_lang_NullPointerException());
1955   }
1956 
1957   ResourceMark rm(THREAD);
1958 
1959   objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
1960   objArrayHandle cmds_ah(THREAD, ca);
1961 
1962   // Make sure we have a String array
1963   Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
1964   if (element_klass != SystemDictionary::String_klass()) {
1965     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1966                "Array element type is not String class");
1967   }
1968 
1969   GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
1970 
1971   int num_cmds = cmds_ah->length();
1972   for (int i = 0; i < num_cmds; i++) {
1973     oop cmd = cmds_ah->obj_at(i);
1974     if (cmd == NULL) {
1975         THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1976                 "Command name cannot be null.");
1977     }
1978     char* cmd_name = java_lang_String::as_utf8_string(cmd);
1979     if (cmd_name == NULL) {
1980         THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1981                 "Command name cannot be null.");
1982     }
1983     int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
1984     if (pos == -1) {
1985         THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1986              "Unknown diagnostic command");
1987     }
1988     DCmdInfo* info = info_list->at(pos);
1989     infoArray[i].name = info->name();
1990     infoArray[i].description = info->description();
1991     infoArray[i].impact = info->impact();
1992     JavaPermission p = info->permission();
1993     infoArray[i].permission_class = p._class;
1994     infoArray[i].permission_name = p._name;
1995     infoArray[i].permission_action = p._action;
1996     infoArray[i].num_arguments = info->num_arguments();
1997     infoArray[i].enabled = info->is_enabled();
1998   }
1999 JVM_END
2000 
2001 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2002           jstring command, dcmdArgInfo* infoArray))
2003   ResourceMark rm(THREAD);
2004   oop cmd = JNIHandles::resolve_external_guard(command);
2005   if (cmd == NULL) {
2006     THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2007               "Command line cannot be null.");
2008   }
2009   char* cmd_name = java_lang_String::as_utf8_string(cmd);
2010   if (cmd_name == NULL) {
2011     THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2012               "Command line content cannot be null.");
2013   }
2014   DCmd* dcmd = NULL;
2015   DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2016                                              strlen(cmd_name));
2017   if (factory != NULL) {
2018     dcmd = factory->create_resource_instance(NULL);
2019   }
2020   if (dcmd == NULL) {
2021     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2022               "Unknown diagnostic command");
2023   }
2024   DCmdMark mark(dcmd);
2025   GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2026   if (array->length() == 0) {
2027     return;
2028   }
2029   for (int i = 0; i < array->length(); i++) {
2030     infoArray[i].name = array->at(i)->name();
2031     infoArray[i].description = array->at(i)->description();
2032     infoArray[i].type = array->at(i)->type();
2033     infoArray[i].default_string = array->at(i)->default_string();
2034     infoArray[i].mandatory = array->at(i)->is_mandatory();
2035     infoArray[i].option = array->at(i)->is_option();
2036     infoArray[i].multiple = array->at(i)->is_multiple();
2037     infoArray[i].position = array->at(i)->position();
2038   }
2039   return;
2040 JVM_END
2041 
2042 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2043   ResourceMark rm(THREAD);
2044   oop cmd = JNIHandles::resolve_external_guard(commandline);
2045   if (cmd == NULL) {
2046     THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2047                    "Command line cannot be null.");
2048   }
2049   char* cmdline = java_lang_String::as_utf8_string(cmd);
2050   if (cmdline == NULL) {
2051     THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2052                    "Command line content cannot be null.");
2053   }
2054   bufferedStream output;
2055   DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2056   oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2057   return (jstring) JNIHandles::make_local(env, result);
2058 JVM_END
2059 
2060 JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2061   DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2062 JVM_END
2063 
2064 jlong Management::ticks_to_ms(jlong ticks) {
2065   assert(os::elapsed_frequency() > 0, "Must be non-zero");
2066   return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2067                  * (double)1000.0);
2068 }
2069 #endif // INCLUDE_MANAGEMENT
2070 
2071 // Gets an array containing the amount of memory allocated on the Java
2072 // heap for a set of threads (in bytes).  Each element of the array is
2073 // the amount of memory allocated for the thread ID specified in the
2074 // corresponding entry in the given array of thread IDs; or -1 if the
2075 // thread does not exist or has terminated.
2076 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2077                                              jlongArray sizeArray))
2078   // Check if threads is null
2079   if (ids == NULL || sizeArray == NULL) {
2080     THROW(vmSymbols::java_lang_NullPointerException());
2081   }
2082 
2083   ResourceMark rm(THREAD);
2084   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2085   typeArrayHandle ids_ah(THREAD, ta);
2086 
2087   typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2088   typeArrayHandle sizeArray_h(THREAD, sa);
2089 
2090   // validate the thread id array
2091   validate_thread_id_array(ids_ah, CHECK);
2092 
2093   // sizeArray must be of the same length as the given array of thread IDs
2094   int num_threads = ids_ah->length();
2095   if (num_threads != sizeArray_h->length()) {
2096     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2097               "The length of the given long array does not match the length of "
2098               "the given array of thread IDs");
2099   }
2100 
2101   ThreadsListHandle tlh;
2102   for (int i = 0; i < num_threads; i++) {
2103     JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2104     if (java_thread != NULL) {
2105       sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2106     }
2107   }
2108 JVM_END
2109 
2110 // Returns the CPU time consumed by a given thread (in nanoseconds).
2111 // If thread_id == 0, CPU time for the current thread is returned.
2112 // If user_sys_cpu_time = true, user level and system CPU time of
2113 // a given thread is returned; otherwise, only user level CPU time
2114 // is returned.
2115 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2116   if (!os::is_thread_cpu_time_supported()) {
2117     return -1;
2118   }
2119 
2120   if (thread_id < 0) {
2121     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2122                "Invalid thread ID", -1);
2123   }
2124 
2125   JavaThread* java_thread = NULL;
2126   if (thread_id == 0) {
2127     // current thread
2128     return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2129   } else {
2130     ThreadsListHandle tlh;
2131     java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
2132     if (java_thread != NULL) {
2133       return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2134     }
2135   }
2136   return -1;
2137 JVM_END
2138 
2139 // Gets an array containing the CPU times consumed by a set of threads
2140 // (in nanoseconds).  Each element of the array is the CPU time for the
2141 // thread ID specified in the corresponding entry in the given array
2142 // of thread IDs; or -1 if the thread does not exist or has terminated.
2143 // If user_sys_cpu_time = true, the sum of user level and system CPU time
2144 // for the given thread is returned; otherwise, only user level CPU time
2145 // is returned.
2146 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2147                                               jlongArray timeArray,
2148                                               jboolean user_sys_cpu_time))
2149   // Check if threads is null
2150   if (ids == NULL || timeArray == NULL) {
2151     THROW(vmSymbols::java_lang_NullPointerException());
2152   }
2153 
2154   ResourceMark rm(THREAD);
2155   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2156   typeArrayHandle ids_ah(THREAD, ta);
2157 
2158   typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2159   typeArrayHandle timeArray_h(THREAD, tia);
2160 
2161   // validate the thread id array
2162   validate_thread_id_array(ids_ah, CHECK);
2163 
2164   // timeArray must be of the same length as the given array of thread IDs
2165   int num_threads = ids_ah->length();
2166   if (num_threads != timeArray_h->length()) {
2167     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2168               "The length of the given long array does not match the length of "
2169               "the given array of thread IDs");
2170   }
2171 
2172   ThreadsListHandle tlh;
2173   for (int i = 0; i < num_threads; i++) {
2174     JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2175     if (java_thread != NULL) {
2176       timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2177                                                       user_sys_cpu_time != 0));
2178     }
2179   }
2180 JVM_END
2181 
2182 
2183 
2184 #if INCLUDE_MANAGEMENT
2185 const struct jmmInterface_1_ jmm_interface = {
2186   NULL,
2187   NULL,
2188   jmm_GetVersion,
2189   jmm_GetOptionalSupport,
2190   jmm_GetThreadInfo,
2191   jmm_GetMemoryPools,
2192   jmm_GetMemoryManagers,
2193   jmm_GetMemoryPoolUsage,
2194   jmm_GetPeakMemoryPoolUsage,
2195   jmm_GetThreadAllocatedMemory,
2196   jmm_GetMemoryUsage,
2197   jmm_GetLongAttribute,
2198   jmm_GetBoolAttribute,
2199   jmm_SetBoolAttribute,
2200   jmm_GetLongAttributes,
2201   jmm_FindMonitorDeadlockedThreads,
2202   jmm_GetThreadCpuTime,
2203   jmm_GetVMGlobalNames,
2204   jmm_GetVMGlobals,
2205   jmm_GetInternalThreadTimes,
2206   jmm_ResetStatistic,
2207   jmm_SetPoolSensor,
2208   jmm_SetPoolThreshold,
2209   jmm_GetPoolCollectionUsage,
2210   jmm_GetGCExtAttributeInfo,
2211   jmm_GetLastGCStat,
2212   jmm_GetThreadCpuTimeWithKind,
2213   jmm_GetThreadCpuTimesWithKind,
2214   jmm_DumpHeap0,
2215   jmm_FindDeadlockedThreads,
2216   jmm_SetVMGlobal,
2217   NULL,
2218   jmm_DumpThreads,
2219   jmm_SetGCNotificationEnabled,
2220   jmm_GetDiagnosticCommands,
2221   jmm_GetDiagnosticCommandInfo,
2222   jmm_GetDiagnosticCommandArgumentsInfo,
2223   jmm_ExecuteDiagnosticCommand,
2224   jmm_SetDiagnosticFrameworkNotificationEnabled
2225 };
2226 #endif // INCLUDE_MANAGEMENT
2227 
2228 void* Management::get_jmm_interface(int version) {
2229 #if INCLUDE_MANAGEMENT
2230   if (version == JMM_VERSION) {
2231     return (void*) &jmm_interface;
2232   }
2233 #endif // INCLUDE_MANAGEMENT
2234   return NULL;
2235 }
--- EOF ---