1 /*
   2  * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/systemDictionary.hpp"
  27 #include "compiler/compileBroker.hpp"
  28 #include "memory/iterator.hpp"
  29 #include "memory/oopFactory.hpp"
  30 #include "memory/resourceArea.hpp"
  31 #include "oops/klass.hpp"
  32 #include "oops/objArrayKlass.hpp"
  33 #include "oops/objArrayOop.inline.hpp"
  34 #include "oops/oop.inline.hpp"
  35 #include "runtime/arguments.hpp"
  36 #include "runtime/globals.hpp"
  37 #include "runtime/handles.inline.hpp"
  38 #include "runtime/interfaceSupport.hpp"
  39 #include "runtime/javaCalls.hpp"
  40 #include "runtime/jniHandles.hpp"
  41 #include "runtime/os.hpp"
  42 #include "runtime/serviceThread.hpp"
  43 #include "runtime/thread.inline.hpp"
  44 #include "services/classLoadingService.hpp"
  45 #include "services/diagnosticCommand.hpp"
  46 #include "services/diagnosticFramework.hpp"
  47 #include "services/writeableFlags.hpp"
  48 #include "services/heapDumper.hpp"
  49 #include "services/jmm.h"
  50 #include "services/lowMemoryDetector.hpp"
  51 #include "services/gcNotifier.hpp"
  52 #include "services/nmtDCmd.hpp"
  53 #include "services/management.hpp"
  54 #include "services/memoryManager.hpp"
  55 #include "services/memoryPool.hpp"
  56 #include "services/memoryService.hpp"
  57 #include "services/runtimeService.hpp"
  58 #include "services/threadService.hpp"
  59 #include "utilities/debug.hpp"
  60 #include "utilities/formatBuffer.hpp"
  61 #include "utilities/macros.hpp"
  62 
  63 PerfVariable* Management::_begin_vm_creation_time = NULL;
  64 PerfVariable* Management::_end_vm_creation_time = NULL;
  65 PerfVariable* Management::_vm_init_done_time = NULL;
  66 
  67 InstanceKlass* Management::_diagnosticCommandImpl_klass = NULL;
  68 InstanceKlass* Management::_garbageCollectorExtImpl_klass = NULL;
  69 InstanceKlass* Management::_garbageCollectorMXBean_klass = NULL;
  70 InstanceKlass* Management::_gcInfo_klass = NULL;
  71 InstanceKlass* Management::_managementFactoryHelper_klass = NULL;
  72 InstanceKlass* Management::_memoryManagerMXBean_klass = NULL;
  73 InstanceKlass* Management::_memoryPoolMXBean_klass = NULL;
  74 InstanceKlass* Management::_memoryUsage_klass = NULL;
  75 InstanceKlass* Management::_sensor_klass = NULL;
  76 InstanceKlass* Management::_threadInfo_klass = NULL;
  77 
  78 jmmOptionalSupport Management::_optional_support = {0};
  79 TimeStamp Management::_stamp;
  80 
  81 void management_init() {
  82 #if INCLUDE_MANAGEMENT
  83   Management::init();
  84   ThreadService::init();
  85   RuntimeService::init();
  86   ClassLoadingService::init();
  87 #else
  88   ThreadService::init();
  89 #endif // INCLUDE_MANAGEMENT
  90 }
  91 
  92 #if INCLUDE_MANAGEMENT
  93 
  94 void Management::init() {
  95   EXCEPTION_MARK;
  96 
  97   // These counters are for java.lang.management API support.
  98   // They are created even if -XX:-UsePerfData is set and in
  99   // that case, they will be allocated on C heap.
 100 
 101   _begin_vm_creation_time =
 102             PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
 103                                              PerfData::U_None, CHECK);
 104 
 105   _end_vm_creation_time =
 106             PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
 107                                              PerfData::U_None, CHECK);
 108 
 109   _vm_init_done_time =
 110             PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
 111                                              PerfData::U_None, CHECK);
 112 
 113   // Initialize optional support
 114   _optional_support.isLowMemoryDetectionSupported = 1;
 115   _optional_support.isCompilationTimeMonitoringSupported = 1;
 116   _optional_support.isThreadContentionMonitoringSupported = 1;
 117 
 118   if (os::is_thread_cpu_time_supported()) {
 119     _optional_support.isCurrentThreadCpuTimeSupported = 1;
 120     _optional_support.isOtherThreadCpuTimeSupported = 1;
 121   } else {
 122     _optional_support.isCurrentThreadCpuTimeSupported = 0;
 123     _optional_support.isOtherThreadCpuTimeSupported = 0;
 124   }
 125 
 126   _optional_support.isObjectMonitorUsageSupported = 1;
 127 #if INCLUDE_SERVICES
 128   // This depends on the heap inspector
 129   _optional_support.isSynchronizerUsageSupported = 1;
 130 #endif // INCLUDE_SERVICES
 131   _optional_support.isThreadAllocatedMemorySupported = 1;
 132   _optional_support.isRemoteDiagnosticCommandsSupported = 1;
 133 
 134   // Registration of the diagnostic commands
 135   DCmdRegistrant::register_dcmds();
 136   DCmdRegistrant::register_dcmds_ext();
 137   uint32_t full_export = DCmd_Source_Internal | DCmd_Source_AttachAPI
 138                          | DCmd_Source_MBean;
 139   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(full_export, true, false));
 140 }
 141 
 142 void Management::initialize(TRAPS) {
 143   // Start the service thread
 144   ServiceThread::initialize();
 145 
 146   if (ManagementServer) {
 147     ResourceMark rm(THREAD);
 148     HandleMark hm(THREAD);
 149 
 150     // Load and initialize the jdk.internal.agent.Agent class
 151     // invoke startAgent method to start the management server
 152     Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
 153     Klass* k = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_agent_Agent(),
 154                                                    loader,
 155                                                    Handle(),
 156                                                    THREAD);
 157     if (k == NULL) {
 158       vm_exit_during_initialization("Management agent initialization failure: "
 159           "class jdk.internal.agent.Agent not found.");
 160     }
 161 
 162     JavaValue result(T_VOID);
 163     JavaCalls::call_static(&result,
 164                            k,
 165                            vmSymbols::startAgent_name(),
 166                            vmSymbols::void_method_signature(),
 167                            CHECK);
 168   }
 169 }
 170 
 171 void Management::get_optional_support(jmmOptionalSupport* support) {
 172   memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
 173 }
 174 
 175 InstanceKlass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
 176   Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
 177   return initialize_klass(k, CHECK_NULL);
 178 }
 179 
 180 InstanceKlass* Management::load_and_initialize_klass_or_null(Symbol* sh, TRAPS) {
 181   Klass* k = SystemDictionary::resolve_or_null(sh, CHECK_NULL);
 182   if (k == NULL) {
 183      return NULL;
 184   }
 185   return initialize_klass(k, CHECK_NULL);
 186 }
 187 
 188 InstanceKlass* Management::initialize_klass(Klass* k, TRAPS) {
 189   InstanceKlass* ik = InstanceKlass::cast(k);
 190   if (ik->should_be_initialized()) {
 191     ik->initialize(CHECK_NULL);
 192   }
 193   // If these classes change to not be owned by the boot loader, they need
 194   // to be walked to keep their class loader alive in oops_do.
 195   assert(ik->class_loader() == NULL, "need to follow in oops_do");
 196   return ik;
 197 }
 198 
 199 void Management::record_vm_startup_time(jlong begin, jlong duration) {
 200   // if the performance counter is not initialized,
 201   // then vm initialization failed; simply return.
 202   if (_begin_vm_creation_time == NULL) return;
 203 
 204   _begin_vm_creation_time->set_value(begin);
 205   _end_vm_creation_time->set_value(begin + duration);
 206   PerfMemory::set_accessible(true);
 207 }
 208 
 209 jlong Management::timestamp() {
 210   TimeStamp t;
 211   t.update();
 212   return t.ticks() - _stamp.ticks();
 213 }
 214 
 215 void Management::oops_do(OopClosure* f) {
 216   MemoryService::oops_do(f);
 217   ThreadService::oops_do(f);
 218 }
 219 
 220 InstanceKlass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {
 221   if (_threadInfo_klass == NULL) {
 222     _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
 223   }
 224   return _threadInfo_klass;
 225 }
 226 
 227 InstanceKlass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {
 228   if (_memoryUsage_klass == NULL) {
 229     _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
 230   }
 231   return _memoryUsage_klass;
 232 }
 233 
 234 InstanceKlass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
 235   if (_memoryPoolMXBean_klass == NULL) {
 236     _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
 237   }
 238   return _memoryPoolMXBean_klass;
 239 }
 240 
 241 InstanceKlass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
 242   if (_memoryManagerMXBean_klass == NULL) {
 243     _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
 244   }
 245   return _memoryManagerMXBean_klass;
 246 }
 247 
 248 InstanceKlass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
 249   if (_garbageCollectorMXBean_klass == NULL) {
 250       _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
 251   }
 252   return _garbageCollectorMXBean_klass;
 253 }
 254 
 255 InstanceKlass* Management::sun_management_Sensor_klass(TRAPS) {
 256   if (_sensor_klass == NULL) {
 257     _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
 258   }
 259   return _sensor_klass;
 260 }
 261 
 262 InstanceKlass* Management::sun_management_ManagementFactoryHelper_klass(TRAPS) {
 263   if (_managementFactoryHelper_klass == NULL) {
 264     _managementFactoryHelper_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactoryHelper(), CHECK_NULL);
 265   }
 266   return _managementFactoryHelper_klass;
 267 }
 268 
 269 InstanceKlass* Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(TRAPS) {
 270   if (_garbageCollectorExtImpl_klass == NULL) {
 271     _garbageCollectorExtImpl_klass =
 272                 load_and_initialize_klass_or_null(vmSymbols::com_sun_management_internal_GarbageCollectorExtImpl(), CHECK_NULL);
 273   }
 274   return _garbageCollectorExtImpl_klass;
 275 }
 276 
 277 InstanceKlass* Management::com_sun_management_GcInfo_klass(TRAPS) {
 278   if (_gcInfo_klass == NULL) {
 279     _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
 280   }
 281   return _gcInfo_klass;
 282 }
 283 
 284 InstanceKlass* Management::com_sun_management_internal_DiagnosticCommandImpl_klass(TRAPS) {
 285   if (_diagnosticCommandImpl_klass == NULL) {
 286     _diagnosticCommandImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_DiagnosticCommandImpl(), CHECK_NULL);
 287   }
 288   return _diagnosticCommandImpl_klass;
 289 }
 290 
 291 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
 292   Handle snapshot_thread(THREAD, snapshot->threadObj());
 293 
 294   jlong contended_time;
 295   jlong waited_time;
 296   if (ThreadService::is_thread_monitoring_contention()) {
 297     contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
 298     waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
 299   } else {
 300     // set them to -1 if thread contention monitoring is disabled.
 301     contended_time = max_julong;
 302     waited_time = max_julong;
 303   }
 304 
 305   int thread_status = snapshot->thread_status();
 306   assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
 307   if (snapshot->is_ext_suspended()) {
 308     thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
 309   }
 310   if (snapshot->is_in_native()) {
 311     thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
 312   }
 313 
 314   ThreadStackTrace* st = snapshot->get_stack_trace();
 315   Handle stacktrace_h;
 316   if (st != NULL) {
 317     stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
 318   } else {
 319     stacktrace_h = Handle();
 320   }
 321 
 322   args->push_oop(snapshot_thread);
 323   args->push_int(thread_status);
 324   args->push_oop(Handle(THREAD, snapshot->blocker_object()));
 325   args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
 326   args->push_long(snapshot->contended_enter_count());
 327   args->push_long(contended_time);
 328   args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
 329   args->push_long(waited_time);
 330   args->push_oop(stacktrace_h);
 331 }
 332 
 333 // Helper function to construct a ThreadInfo object
 334 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
 335   InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
 336 
 337   JavaValue result(T_VOID);
 338   JavaCallArguments args(14);
 339 
 340   // First allocate a ThreadObj object and
 341   // push the receiver as the first argument
 342   Handle element = ik->allocate_instance_handle(CHECK_NULL);
 343   args.push_oop(element);
 344 
 345   // initialize the arguments for the ThreadInfo constructor
 346   initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
 347 
 348   // Call ThreadInfo constructor with no locked monitors and synchronizers
 349   JavaCalls::call_special(&result,
 350                           ik,
 351                           vmSymbols::object_initializer_name(),
 352                           vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
 353                           &args,
 354                           CHECK_NULL);
 355 
 356   return (instanceOop) element();
 357 }
 358 
 359 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
 360                                                     objArrayHandle monitors_array,
 361                                                     typeArrayHandle depths_array,
 362                                                     objArrayHandle synchronizers_array,
 363                                                     TRAPS) {
 364   InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
 365 
 366   JavaValue result(T_VOID);
 367   JavaCallArguments args(17);
 368 
 369   // First allocate a ThreadObj object and
 370   // push the receiver as the first argument
 371   Handle element = ik->allocate_instance_handle(CHECK_NULL);
 372   args.push_oop(element);
 373 
 374   // initialize the arguments for the ThreadInfo constructor
 375   initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
 376 
 377   // push the locked monitors and synchronizers in the arguments
 378   args.push_oop(monitors_array);
 379   args.push_oop(depths_array);
 380   args.push_oop(synchronizers_array);
 381 
 382   // Call ThreadInfo constructor with locked monitors and synchronizers
 383   JavaCalls::call_special(&result,
 384                           ik,
 385                           vmSymbols::object_initializer_name(),
 386                           vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
 387                           &args,
 388                           CHECK_NULL);
 389 
 390   return (instanceOop) element();
 391 }
 392 
 393 
 394 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
 395   if (mgr == NULL) {
 396     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
 397   }
 398   oop mgr_obj = JNIHandles::resolve(mgr);
 399   instanceHandle h(THREAD, (instanceOop) mgr_obj);
 400 
 401   InstanceKlass* k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
 402   if (!h->is_a(k)) {
 403     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
 404                "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
 405                NULL);
 406   }
 407 
 408   MemoryManager* gc = MemoryService::get_memory_manager(h);
 409   if (gc == NULL || !gc->is_gc_memory_manager()) {
 410     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
 411                "Invalid GC memory manager",
 412                NULL);
 413   }
 414   return (GCMemoryManager*) gc;
 415 }
 416 
 417 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
 418   if (obj == NULL) {
 419     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
 420   }
 421 
 422   oop pool_obj = JNIHandles::resolve(obj);
 423   assert(pool_obj->is_instance(), "Should be an instanceOop");
 424   instanceHandle ph(THREAD, (instanceOop) pool_obj);
 425 
 426   return MemoryService::get_memory_pool(ph);
 427 }
 428 
 429 #endif // INCLUDE_MANAGEMENT
 430 
 431 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
 432   int num_threads = ids_ah->length();
 433 
 434   // Validate input thread IDs
 435   int i = 0;
 436   for (i = 0; i < num_threads; i++) {
 437     jlong tid = ids_ah->long_at(i);
 438     if (tid <= 0) {
 439       // throw exception if invalid thread id.
 440       THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
 441                 "Invalid thread ID entry");
 442     }
 443   }
 444 }
 445 
 446 #if INCLUDE_MANAGEMENT
 447 
 448 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
 449   // check if the element of infoArray is of type ThreadInfo class
 450   Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
 451   Klass* element_klass = ObjArrayKlass::cast(infoArray_h->klass())->element_klass();
 452   if (element_klass != threadinfo_klass) {
 453     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
 454               "infoArray element type is not ThreadInfo class");
 455   }
 456 }
 457 
 458 
 459 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
 460   if (obj == NULL) {
 461     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
 462   }
 463 
 464   oop mgr_obj = JNIHandles::resolve(obj);
 465   assert(mgr_obj->is_instance(), "Should be an instanceOop");
 466   instanceHandle mh(THREAD, (instanceOop) mgr_obj);
 467 
 468   return MemoryService::get_memory_manager(mh);
 469 }
 470 
 471 // Returns a version string and sets major and minor version if
 472 // the input parameters are non-null.
 473 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
 474   return JMM_VERSION;
 475 JVM_END
 476 
 477 // Gets the list of VM monitoring and management optional supports
 478 // Returns 0 if succeeded; otherwise returns non-zero.
 479 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
 480   if (support == NULL) {
 481     return -1;
 482   }
 483   Management::get_optional_support(support);
 484   return 0;
 485 JVM_END
 486 
 487 // Returns an array of java/lang/management/MemoryPoolMXBean object
 488 // one for each memory pool if obj == null; otherwise returns
 489 // an array of memory pools for a given memory manager if
 490 // it is a valid memory manager.
 491 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
 492   ResourceMark rm(THREAD);
 493 
 494   int num_memory_pools;
 495   MemoryManager* mgr = NULL;
 496   if (obj == NULL) {
 497     num_memory_pools = MemoryService::num_memory_pools();
 498   } else {
 499     mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
 500     if (mgr == NULL) {
 501       return NULL;
 502     }
 503     num_memory_pools = mgr->num_memory_pools();
 504   }
 505 
 506   // Allocate the resulting MemoryPoolMXBean[] object
 507   InstanceKlass* ik = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
 508   objArrayOop r = oopFactory::new_objArray(ik, num_memory_pools, CHECK_NULL);
 509   objArrayHandle poolArray(THREAD, r);
 510 
 511   if (mgr == NULL) {
 512     // Get all memory pools
 513     for (int i = 0; i < num_memory_pools; i++) {
 514       MemoryPool* pool = MemoryService::get_memory_pool(i);
 515       instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
 516       instanceHandle ph(THREAD, p);
 517       poolArray->obj_at_put(i, ph());
 518     }
 519   } else {
 520     // Get memory pools managed by a given memory manager
 521     for (int i = 0; i < num_memory_pools; i++) {
 522       MemoryPool* pool = mgr->get_memory_pool(i);
 523       instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
 524       instanceHandle ph(THREAD, p);
 525       poolArray->obj_at_put(i, ph());
 526     }
 527   }
 528   return (jobjectArray) JNIHandles::make_local(env, poolArray());
 529 JVM_END
 530 
 531 // Returns an array of java/lang/management/MemoryManagerMXBean object
 532 // one for each memory manager if obj == null; otherwise returns
 533 // an array of memory managers for a given memory pool if
 534 // it is a valid memory pool.
 535 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
 536   ResourceMark rm(THREAD);
 537 
 538   int num_mgrs;
 539   MemoryPool* pool = NULL;
 540   if (obj == NULL) {
 541     num_mgrs = MemoryService::num_memory_managers();
 542   } else {
 543     pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 544     if (pool == NULL) {
 545       return NULL;
 546     }
 547     num_mgrs = pool->num_memory_managers();
 548   }
 549 
 550   // Allocate the resulting MemoryManagerMXBean[] object
 551   InstanceKlass* ik = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
 552   objArrayOop r = oopFactory::new_objArray(ik, num_mgrs, CHECK_NULL);
 553   objArrayHandle mgrArray(THREAD, r);
 554 
 555   if (pool == NULL) {
 556     // Get all memory managers
 557     for (int i = 0; i < num_mgrs; i++) {
 558       MemoryManager* mgr = MemoryService::get_memory_manager(i);
 559       instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
 560       instanceHandle ph(THREAD, p);
 561       mgrArray->obj_at_put(i, ph());
 562     }
 563   } else {
 564     // Get memory managers for a given memory pool
 565     for (int i = 0; i < num_mgrs; i++) {
 566       MemoryManager* mgr = pool->get_memory_manager(i);
 567       instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
 568       instanceHandle ph(THREAD, p);
 569       mgrArray->obj_at_put(i, ph());
 570     }
 571   }
 572   return (jobjectArray) JNIHandles::make_local(env, mgrArray());
 573 JVM_END
 574 
 575 
 576 // Returns a java/lang/management/MemoryUsage object containing the memory usage
 577 // of a given memory pool.
 578 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
 579   ResourceMark rm(THREAD);
 580 
 581   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 582   if (pool != NULL) {
 583     MemoryUsage usage = pool->get_memory_usage();
 584     Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 585     return JNIHandles::make_local(env, h());
 586   } else {
 587     return NULL;
 588   }
 589 JVM_END
 590 
 591 // Returns a java/lang/management/MemoryUsage object containing the memory usage
 592 // of a given memory pool.
 593 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
 594   ResourceMark rm(THREAD);
 595 
 596   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 597   if (pool != NULL) {
 598     MemoryUsage usage = pool->get_peak_memory_usage();
 599     Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 600     return JNIHandles::make_local(env, h());
 601   } else {
 602     return NULL;
 603   }
 604 JVM_END
 605 
 606 // Returns a java/lang/management/MemoryUsage object containing the memory usage
 607 // of a given memory pool after most recent GC.
 608 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
 609   ResourceMark rm(THREAD);
 610 
 611   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 612   if (pool != NULL && pool->is_collected_pool()) {
 613     MemoryUsage usage = pool->get_last_collection_usage();
 614     Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 615     return JNIHandles::make_local(env, h());
 616   } else {
 617     return NULL;
 618   }
 619 JVM_END
 620 
 621 // Sets the memory pool sensor for a threshold type
 622 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
 623   if (obj == NULL || sensorObj == NULL) {
 624     THROW(vmSymbols::java_lang_NullPointerException());
 625   }
 626 
 627   InstanceKlass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
 628   oop s = JNIHandles::resolve(sensorObj);
 629   assert(s->is_instance(), "Sensor should be an instanceOop");
 630   instanceHandle sensor_h(THREAD, (instanceOop) s);
 631   if (!sensor_h->is_a(sensor_klass)) {
 632     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
 633               "Sensor is not an instance of sun.management.Sensor class");
 634   }
 635 
 636   MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
 637   assert(mpool != NULL, "MemoryPool should exist");
 638 
 639   switch (type) {
 640     case JMM_USAGE_THRESHOLD_HIGH:
 641     case JMM_USAGE_THRESHOLD_LOW:
 642       // have only one sensor for threshold high and low
 643       mpool->set_usage_sensor_obj(sensor_h);
 644       break;
 645     case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
 646     case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
 647       // have only one sensor for threshold high and low
 648       mpool->set_gc_usage_sensor_obj(sensor_h);
 649       break;
 650     default:
 651       assert(false, "Unrecognized type");
 652   }
 653 
 654 JVM_END
 655 
 656 
 657 // Sets the threshold of a given memory pool.
 658 // Returns the previous threshold.
 659 //
 660 // Input parameters:
 661 //   pool      - the MemoryPoolMXBean object
 662 //   type      - threshold type
 663 //   threshold - the new threshold (must not be negative)
 664 //
 665 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
 666   if (threshold < 0) {
 667     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
 668                "Invalid threshold value",
 669                -1);
 670   }
 671 
 672   if ((size_t)threshold > max_uintx) {
 673     stringStream st;
 674     st.print("Invalid valid threshold value. Threshold value (" JLONG_FORMAT ") > max value of size_t (" UINTX_FORMAT ")", threshold, max_uintx);
 675     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
 676   }
 677 
 678   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
 679   assert(pool != NULL, "MemoryPool should exist");
 680 
 681   jlong prev = 0;
 682   switch (type) {
 683     case JMM_USAGE_THRESHOLD_HIGH:
 684       if (!pool->usage_threshold()->is_high_threshold_supported()) {
 685         return -1;
 686       }
 687       prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
 688       break;
 689 
 690     case JMM_USAGE_THRESHOLD_LOW:
 691       if (!pool->usage_threshold()->is_low_threshold_supported()) {
 692         return -1;
 693       }
 694       prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
 695       break;
 696 
 697     case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
 698       if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
 699         return -1;
 700       }
 701       // return and the new threshold is effective for the next GC
 702       return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
 703 
 704     case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
 705       if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
 706         return -1;
 707       }
 708       // return and the new threshold is effective for the next GC
 709       return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
 710 
 711     default:
 712       assert(false, "Unrecognized type");
 713       return -1;
 714   }
 715 
 716   // When the threshold is changed, reevaluate if the low memory
 717   // detection is enabled.
 718   if (prev != threshold) {
 719     LowMemoryDetector::recompute_enabled_for_collected_pools();
 720     LowMemoryDetector::detect_low_memory(pool);
 721   }
 722   return prev;
 723 JVM_END
 724 
 725 // Returns a java/lang/management/MemoryUsage object representing
 726 // the memory usage for the heap or non-heap memory.
 727 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
 728   ResourceMark rm(THREAD);
 729 
 730   // Calculate the memory usage
 731   size_t total_init = 0;
 732   size_t total_used = 0;
 733   size_t total_committed = 0;
 734   size_t total_max = 0;
 735   bool   has_undefined_init_size = false;
 736   bool   has_undefined_max_size = false;
 737 
 738   for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
 739     MemoryPool* pool = MemoryService::get_memory_pool(i);
 740     if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
 741       MemoryUsage u = pool->get_memory_usage();
 742       total_used += u.used();
 743       total_committed += u.committed();
 744 
 745       if (u.init_size() == (size_t)-1) {
 746         has_undefined_init_size = true;
 747       }
 748       if (!has_undefined_init_size) {
 749         total_init += u.init_size();
 750       }
 751 
 752       if (u.max_size() == (size_t)-1) {
 753         has_undefined_max_size = true;
 754       }
 755       if (!has_undefined_max_size) {
 756         total_max += u.max_size();
 757       }
 758     }
 759   }
 760 
 761   // if any one of the memory pool has undefined init_size or max_size,
 762   // set it to -1
 763   if (has_undefined_init_size) {
 764     total_init = (size_t)-1;
 765   }
 766   if (has_undefined_max_size) {
 767     total_max = (size_t)-1;
 768   }
 769 
 770   MemoryUsage usage((heap ? InitialHeapSize : total_init),
 771                     total_used,
 772                     total_committed,
 773                     (heap ? Universe::heap()->max_capacity() : total_max));
 774 
 775   Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 776   return JNIHandles::make_local(env, obj());
 777 JVM_END
 778 
 779 // Returns the boolean value of a given attribute.
 780 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
 781   switch (att) {
 782   case JMM_VERBOSE_GC:
 783     return MemoryService::get_verbose();
 784   case JMM_VERBOSE_CLASS:
 785     return ClassLoadingService::get_verbose();
 786   case JMM_THREAD_CONTENTION_MONITORING:
 787     return ThreadService::is_thread_monitoring_contention();
 788   case JMM_THREAD_CPU_TIME:
 789     return ThreadService::is_thread_cpu_time_enabled();
 790   case JMM_THREAD_ALLOCATED_MEMORY:
 791     return ThreadService::is_thread_allocated_memory_enabled();
 792   default:
 793     assert(0, "Unrecognized attribute");
 794     return false;
 795   }
 796 JVM_END
 797 
 798 // Sets the given boolean attribute and returns the previous value.
 799 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
 800   switch (att) {
 801   case JMM_VERBOSE_GC:
 802     return MemoryService::set_verbose(flag != 0);
 803   case JMM_VERBOSE_CLASS:
 804     return ClassLoadingService::set_verbose(flag != 0);
 805   case JMM_THREAD_CONTENTION_MONITORING:
 806     return ThreadService::set_thread_monitoring_contention(flag != 0);
 807   case JMM_THREAD_CPU_TIME:
 808     return ThreadService::set_thread_cpu_time_enabled(flag != 0);
 809   case JMM_THREAD_ALLOCATED_MEMORY:
 810     return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
 811   default:
 812     assert(0, "Unrecognized attribute");
 813     return false;
 814   }
 815 JVM_END
 816 
 817 
 818 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
 819   switch (att) {
 820   case JMM_GC_TIME_MS:
 821     return mgr->gc_time_ms();
 822 
 823   case JMM_GC_COUNT:
 824     return mgr->gc_count();
 825 
 826   case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
 827     // current implementation only has 1 ext attribute
 828     return 1;
 829 
 830   default:
 831     assert(0, "Unrecognized GC attribute");
 832     return -1;
 833   }
 834 }
 835 
 836 class VmThreadCountClosure: public ThreadClosure {
 837  private:
 838   int _count;
 839  public:
 840   VmThreadCountClosure() : _count(0) {};
 841   void do_thread(Thread* thread);
 842   int count() { return _count; }
 843 };
 844 
 845 void VmThreadCountClosure::do_thread(Thread* thread) {
 846   // exclude externally visible JavaThreads
 847   if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
 848     return;
 849   }
 850 
 851   _count++;
 852 }
 853 
 854 static jint get_vm_thread_count() {
 855   VmThreadCountClosure vmtcc;
 856   {
 857     MutexLockerEx ml(Threads_lock);
 858     Threads::threads_do(&vmtcc);
 859   }
 860 
 861   return vmtcc.count();
 862 }
 863 
 864 static jint get_num_flags() {
 865   // last flag entry is always NULL, so subtract 1
 866   int nFlags = (int) Flag::numFlags - 1;
 867   int count = 0;
 868   for (int i = 0; i < nFlags; i++) {
 869     Flag* flag = &Flag::flags[i];
 870     // Exclude the locked (diagnostic, experimental) flags
 871     if (flag->is_unlocked() || flag->is_unlocker()) {
 872       count++;
 873     }
 874   }
 875   return count;
 876 }
 877 
 878 static jlong get_long_attribute(jmmLongAttribute att) {
 879   switch (att) {
 880   case JMM_CLASS_LOADED_COUNT:
 881     return ClassLoadingService::loaded_class_count();
 882 
 883   case JMM_CLASS_UNLOADED_COUNT:
 884     return ClassLoadingService::unloaded_class_count();
 885 
 886   case JMM_THREAD_TOTAL_COUNT:
 887     return ThreadService::get_total_thread_count();
 888 
 889   case JMM_THREAD_LIVE_COUNT:
 890     return ThreadService::get_live_thread_count();
 891 
 892   case JMM_THREAD_PEAK_COUNT:
 893     return ThreadService::get_peak_thread_count();
 894 
 895   case JMM_THREAD_DAEMON_COUNT:
 896     return ThreadService::get_daemon_thread_count();
 897 
 898   case JMM_JVM_INIT_DONE_TIME_MS:
 899     return Management::vm_init_done_time();
 900 
 901   case JMM_JVM_UPTIME_MS:
 902     return Management::ticks_to_ms(os::elapsed_counter());
 903 
 904   case JMM_COMPILE_TOTAL_TIME_MS:
 905     return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
 906 
 907   case JMM_OS_PROCESS_ID:
 908     return os::current_process_id();
 909 
 910   // Hotspot-specific counters
 911   case JMM_CLASS_LOADED_BYTES:
 912     return ClassLoadingService::loaded_class_bytes();
 913 
 914   case JMM_CLASS_UNLOADED_BYTES:
 915     return ClassLoadingService::unloaded_class_bytes();
 916 
 917   case JMM_SHARED_CLASS_LOADED_COUNT:
 918     return ClassLoadingService::loaded_shared_class_count();
 919 
 920   case JMM_SHARED_CLASS_UNLOADED_COUNT:
 921     return ClassLoadingService::unloaded_shared_class_count();
 922 
 923 
 924   case JMM_SHARED_CLASS_LOADED_BYTES:
 925     return ClassLoadingService::loaded_shared_class_bytes();
 926 
 927   case JMM_SHARED_CLASS_UNLOADED_BYTES:
 928     return ClassLoadingService::unloaded_shared_class_bytes();
 929 
 930   case JMM_TOTAL_CLASSLOAD_TIME_MS:
 931     return ClassLoader::classloader_time_ms();
 932 
 933   case JMM_VM_GLOBAL_COUNT:
 934     return get_num_flags();
 935 
 936   case JMM_SAFEPOINT_COUNT:
 937     return RuntimeService::safepoint_count();
 938 
 939   case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
 940     return RuntimeService::safepoint_sync_time_ms();
 941 
 942   case JMM_TOTAL_STOPPED_TIME_MS:
 943     return RuntimeService::safepoint_time_ms();
 944 
 945   case JMM_TOTAL_APP_TIME_MS:
 946     return RuntimeService::application_time_ms();
 947 
 948   case JMM_VM_THREAD_COUNT:
 949     return get_vm_thread_count();
 950 
 951   case JMM_CLASS_INIT_TOTAL_COUNT:
 952     return ClassLoader::class_init_count();
 953 
 954   case JMM_CLASS_INIT_TOTAL_TIME_MS:
 955     return ClassLoader::class_init_time_ms();
 956 
 957   case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
 958     return ClassLoader::class_verify_time_ms();
 959 
 960   case JMM_METHOD_DATA_SIZE_BYTES:
 961     return ClassLoadingService::class_method_data_size();
 962 
 963   case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
 964     return os::physical_memory();
 965 
 966   default:
 967     return -1;
 968   }
 969 }
 970 
 971 
 972 // Returns the long value of a given attribute.
 973 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
 974   if (obj == NULL) {
 975     return get_long_attribute(att);
 976   } else {
 977     GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
 978     if (mgr != NULL) {
 979       return get_gc_attribute(mgr, att);
 980     }
 981   }
 982   return -1;
 983 JVM_END
 984 
 985 // Gets the value of all attributes specified in the given array
 986 // and sets the value in the result array.
 987 // Returns the number of attributes found.
 988 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
 989                                       jobject obj,
 990                                       jmmLongAttribute* atts,
 991                                       jint count,
 992                                       jlong* result))
 993 
 994   int num_atts = 0;
 995   if (obj == NULL) {
 996     for (int i = 0; i < count; i++) {
 997       result[i] = get_long_attribute(atts[i]);
 998       if (result[i] != -1) {
 999         num_atts++;
1000       }
1001     }
1002   } else {
1003     GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
1004     for (int i = 0; i < count; i++) {
1005       result[i] = get_gc_attribute(mgr, atts[i]);
1006       if (result[i] != -1) {
1007         num_atts++;
1008       }
1009     }
1010   }
1011   return num_atts;
1012 JVM_END
1013 
1014 // Helper function to do thread dump for a specific list of threads
1015 static void do_thread_dump(ThreadDumpResult* dump_result,
1016                            typeArrayHandle ids_ah,  // array of thread ID (long[])
1017                            int num_threads,
1018                            int max_depth,
1019                            bool with_locked_monitors,
1020                            bool with_locked_synchronizers,
1021                            TRAPS) {
1022   // no need to actually perform thread dump if no TIDs are specified
1023   if (num_threads == 0) return;
1024 
1025   // First get an array of threadObj handles.
1026   // A JavaThread may terminate before we get the stack trace.
1027   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1028   {
1029     MutexLockerEx ml(Threads_lock);
1030     for (int i = 0; i < num_threads; i++) {
1031       jlong tid = ids_ah->long_at(i);
1032       JavaThread* jt = Threads::find_java_thread_from_java_tid(tid);
1033       oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1034       instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1035       thread_handle_array->append(threadObj_h);
1036     }
1037   }
1038 
1039   // Obtain thread dumps and thread snapshot information
1040   VM_ThreadDump op(dump_result,
1041                    thread_handle_array,
1042                    num_threads,
1043                    max_depth, /* stack depth */
1044                    with_locked_monitors,
1045                    with_locked_synchronizers);
1046   VMThread::execute(&op);
1047 }
1048 
1049 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1050 // for the thread ID specified in the corresponding entry in
1051 // the given array of thread IDs; or NULL if the thread does not exist
1052 // or has terminated.
1053 //
1054 // Input parameters:
1055 //   ids       - array of thread IDs
1056 //   maxDepth  - the maximum depth of stack traces to be dumped:
1057 //               maxDepth == -1 requests to dump entire stack trace.
1058 //               maxDepth == 0  requests no stack trace.
1059 //   infoArray - array of ThreadInfo objects
1060 //
1061 // QQQ - Why does this method return a value instead of void?
1062 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1063   // Check if threads is null
1064   if (ids == NULL || infoArray == NULL) {
1065     THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1066   }
1067 
1068   if (maxDepth < -1) {
1069     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1070                "Invalid maxDepth", -1);
1071   }
1072 
1073   ResourceMark rm(THREAD);
1074   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1075   typeArrayHandle ids_ah(THREAD, ta);
1076 
1077   oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1078   objArrayOop oa = objArrayOop(infoArray_obj);
1079   objArrayHandle infoArray_h(THREAD, oa);
1080 
1081   // validate the thread id array
1082   validate_thread_id_array(ids_ah, CHECK_0);
1083 
1084   // validate the ThreadInfo[] parameters
1085   validate_thread_info_array(infoArray_h, CHECK_0);
1086 
1087   // infoArray must be of the same length as the given array of thread IDs
1088   int num_threads = ids_ah->length();
1089   if (num_threads != infoArray_h->length()) {
1090     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1091                "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1092   }
1093 
1094   // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1095   java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1096 
1097   // Must use ThreadDumpResult to store the ThreadSnapshot.
1098   // GC may occur after the thread snapshots are taken but before
1099   // this function returns. The threadObj and other oops kept
1100   // in the ThreadSnapshot are marked and adjusted during GC.
1101   ThreadDumpResult dump_result(num_threads);
1102 
1103   if (maxDepth == 0) {
1104     // no stack trace dumped - do not need to stop the world
1105     {
1106       MutexLockerEx ml(Threads_lock);
1107       for (int i = 0; i < num_threads; i++) {
1108         jlong tid = ids_ah->long_at(i);
1109         JavaThread* jt = Threads::find_java_thread_from_java_tid(tid);
1110         ThreadSnapshot* ts;
1111         if (jt == NULL) {
1112           // if the thread does not exist or now it is terminated,
1113           // create dummy snapshot
1114           ts = new ThreadSnapshot();
1115         } else {
1116           ts = new ThreadSnapshot(jt);
1117         }
1118         dump_result.add_thread_snapshot(ts);
1119       }
1120     }
1121   } else {
1122     // obtain thread dump with the specific list of threads with stack trace
1123     do_thread_dump(&dump_result,
1124                    ids_ah,
1125                    num_threads,
1126                    maxDepth,
1127                    false, /* no locked monitor */
1128                    false, /* no locked synchronizers */
1129                    CHECK_0);
1130   }
1131 
1132   int num_snapshots = dump_result.num_snapshots();
1133   assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1134   int index = 0;
1135   for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1136     // For each thread, create an java/lang/management/ThreadInfo object
1137     // and fill with the thread information
1138 
1139     if (ts->threadObj() == NULL) {
1140      // if the thread does not exist or now it is terminated, set threadinfo to NULL
1141       infoArray_h->obj_at_put(index, NULL);
1142       continue;
1143     }
1144 
1145     // Create java.lang.management.ThreadInfo object
1146     instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1147     infoArray_h->obj_at_put(index, info_obj);
1148   }
1149   return 0;
1150 JVM_END
1151 
1152 // Dump thread info for the specified threads.
1153 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1154 // for the thread ID specified in the corresponding entry in
1155 // the given array of thread IDs; or NULL if the thread does not exist
1156 // or has terminated.
1157 //
1158 // Input parameter:
1159 //    ids - array of thread IDs; NULL indicates all live threads
1160 //    locked_monitors - if true, dump locked object monitors
1161 //    locked_synchronizers - if true, dump locked JSR-166 synchronizers
1162 //
1163 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers))
1164   ResourceMark rm(THREAD);
1165 
1166   // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1167   java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1168 
1169   typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1170   int num_threads = (ta != NULL ? ta->length() : 0);
1171   typeArrayHandle ids_ah(THREAD, ta);
1172 
1173   ThreadDumpResult dump_result(num_threads);  // can safepoint
1174 
1175   if (ids_ah() != NULL) {
1176 
1177     // validate the thread id array
1178     validate_thread_id_array(ids_ah, CHECK_NULL);
1179 
1180     // obtain thread dump of a specific list of threads
1181     do_thread_dump(&dump_result,
1182                    ids_ah,
1183                    num_threads,
1184                    -1, /* entire stack */
1185                    (locked_monitors ? true : false),      /* with locked monitors */
1186                    (locked_synchronizers ? true : false), /* with locked synchronizers */
1187                    CHECK_NULL);
1188   } else {
1189     // obtain thread dump of all threads
1190     VM_ThreadDump op(&dump_result,
1191                      -1, /* entire stack */
1192                      (locked_monitors ? true : false),     /* with locked monitors */
1193                      (locked_synchronizers ? true : false) /* with locked synchronizers */);
1194     VMThread::execute(&op);
1195   }
1196 
1197   int num_snapshots = dump_result.num_snapshots();
1198 
1199   // create the result ThreadInfo[] object
1200   InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1201   objArrayOop r = oopFactory::new_objArray(ik, num_snapshots, CHECK_NULL);
1202   objArrayHandle result_h(THREAD, r);
1203 
1204   int index = 0;
1205   for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1206     if (ts->threadObj() == NULL) {
1207      // if the thread does not exist or now it is terminated, set threadinfo to NULL
1208       result_h->obj_at_put(index, NULL);
1209       continue;
1210     }
1211 
1212     ThreadStackTrace* stacktrace = ts->get_stack_trace();
1213     assert(stacktrace != NULL, "Must have a stack trace dumped");
1214 
1215     // Create Object[] filled with locked monitors
1216     // Create int[] filled with the stack depth where a monitor was locked
1217     int num_frames = stacktrace->get_stack_depth();
1218     int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1219 
1220     // Count the total number of locked monitors
1221     for (int i = 0; i < num_frames; i++) {
1222       StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1223       num_locked_monitors += frame->num_locked_monitors();
1224     }
1225 
1226     objArrayHandle monitors_array;
1227     typeArrayHandle depths_array;
1228     objArrayHandle synchronizers_array;
1229 
1230     if (locked_monitors) {
1231       // Constructs Object[] and int[] to contain the object monitor and the stack depth
1232       // where the thread locked it
1233       objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1234       objArrayHandle mh(THREAD, array);
1235       monitors_array = mh;
1236 
1237       typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1238       typeArrayHandle dh(THREAD, tarray);
1239       depths_array = dh;
1240 
1241       int count = 0;
1242       int j = 0;
1243       for (int depth = 0; depth < num_frames; depth++) {
1244         StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1245         int len = frame->num_locked_monitors();
1246         GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1247         for (j = 0; j < len; j++) {
1248           oop monitor = locked_monitors->at(j);
1249           assert(monitor != NULL, "must be a Java object");
1250           monitors_array->obj_at_put(count, monitor);
1251           depths_array->int_at_put(count, depth);
1252           count++;
1253         }
1254       }
1255 
1256       GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1257       for (j = 0; j < jni_locked_monitors->length(); j++) {
1258         oop object = jni_locked_monitors->at(j);
1259         assert(object != NULL, "must be a Java object");
1260         monitors_array->obj_at_put(count, object);
1261         // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1262         depths_array->int_at_put(count, -1);
1263         count++;
1264       }
1265       assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1266     }
1267 
1268     if (locked_synchronizers) {
1269       // Create Object[] filled with locked JSR-166 synchronizers
1270       assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1271       ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1272       GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1273       int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1274 
1275       objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1276       objArrayHandle sh(THREAD, array);
1277       synchronizers_array = sh;
1278 
1279       for (int k = 0; k < num_locked_synchronizers; k++) {
1280         synchronizers_array->obj_at_put(k, locks->at(k));
1281       }
1282     }
1283 
1284     // Create java.lang.management.ThreadInfo object
1285     instanceOop info_obj = Management::create_thread_info_instance(ts,
1286                                                                    monitors_array,
1287                                                                    depths_array,
1288                                                                    synchronizers_array,
1289                                                                    CHECK_NULL);
1290     result_h->obj_at_put(index, info_obj);
1291   }
1292 
1293   return (jobjectArray) JNIHandles::make_local(env, result_h());
1294 JVM_END
1295 
1296 // Reset statistic.  Return true if the requested statistic is reset.
1297 // Otherwise, return false.
1298 //
1299 // Input parameters:
1300 //  obj  - specify which instance the statistic associated with to be reset
1301 //         For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1302 //         For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1303 //  type - the type of statistic to be reset
1304 //
1305 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1306   ResourceMark rm(THREAD);
1307 
1308   switch (type) {
1309     case JMM_STAT_PEAK_THREAD_COUNT:
1310       ThreadService::reset_peak_thread_count();
1311       return true;
1312 
1313     case JMM_STAT_THREAD_CONTENTION_COUNT:
1314     case JMM_STAT_THREAD_CONTENTION_TIME: {
1315       jlong tid = obj.j;
1316       if (tid < 0) {
1317         THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1318       }
1319 
1320       // Look for the JavaThread of this given tid
1321       MutexLockerEx ml(Threads_lock);
1322       if (tid == 0) {
1323         // reset contention statistics for all threads if tid == 0
1324         for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) {
1325           if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1326             ThreadService::reset_contention_count_stat(java_thread);
1327           } else {
1328             ThreadService::reset_contention_time_stat(java_thread);
1329           }
1330         }
1331       } else {
1332         // reset contention statistics for a given thread
1333         JavaThread* java_thread = Threads::find_java_thread_from_java_tid(tid);
1334         if (java_thread == NULL) {
1335           return false;
1336         }
1337 
1338         if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1339           ThreadService::reset_contention_count_stat(java_thread);
1340         } else {
1341           ThreadService::reset_contention_time_stat(java_thread);
1342         }
1343       }
1344       return true;
1345       break;
1346     }
1347     case JMM_STAT_PEAK_POOL_USAGE: {
1348       jobject o = obj.l;
1349       if (o == NULL) {
1350         THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1351       }
1352 
1353       oop pool_obj = JNIHandles::resolve(o);
1354       assert(pool_obj->is_instance(), "Should be an instanceOop");
1355       instanceHandle ph(THREAD, (instanceOop) pool_obj);
1356 
1357       MemoryPool* pool = MemoryService::get_memory_pool(ph);
1358       if (pool != NULL) {
1359         pool->reset_peak_memory_usage();
1360         return true;
1361       }
1362       break;
1363     }
1364     case JMM_STAT_GC_STAT: {
1365       jobject o = obj.l;
1366       if (o == NULL) {
1367         THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1368       }
1369 
1370       GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1371       if (mgr != NULL) {
1372         mgr->reset_gc_stat();
1373         return true;
1374       }
1375       break;
1376     }
1377     default:
1378       assert(0, "Unknown Statistic Type");
1379   }
1380   return false;
1381 JVM_END
1382 
1383 // Returns the fast estimate of CPU time consumed by
1384 // a given thread (in nanoseconds).
1385 // If thread_id == 0, return CPU time for the current thread.
1386 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1387   if (!os::is_thread_cpu_time_supported()) {
1388     return -1;
1389   }
1390 
1391   if (thread_id < 0) {
1392     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1393                "Invalid thread ID", -1);
1394   }
1395 
1396   JavaThread* java_thread = NULL;
1397   if (thread_id == 0) {
1398     // current thread
1399     return os::current_thread_cpu_time();
1400   } else {
1401     MutexLockerEx ml(Threads_lock);
1402     java_thread = Threads::find_java_thread_from_java_tid(thread_id);
1403     if (java_thread != NULL) {
1404       return os::thread_cpu_time((Thread*) java_thread);
1405     }
1406   }
1407   return -1;
1408 JVM_END
1409 
1410 // Returns a String array of all VM global flag names
1411 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1412   // last flag entry is always NULL, so subtract 1
1413   int nFlags = (int) Flag::numFlags - 1;
1414   // allocate a temp array
1415   objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1416                                            nFlags, CHECK_0);
1417   objArrayHandle flags_ah(THREAD, r);
1418   int num_entries = 0;
1419   for (int i = 0; i < nFlags; i++) {
1420     Flag* flag = &Flag::flags[i];
1421     // Exclude notproduct and develop flags in product builds.
1422     if (flag->is_constant_in_binary()) {
1423       continue;
1424     }
1425     // Exclude the locked (experimental, diagnostic) flags
1426     if (flag->is_unlocked() || flag->is_unlocker()) {
1427       Handle s = java_lang_String::create_from_str(flag->_name, CHECK_0);
1428       flags_ah->obj_at_put(num_entries, s());
1429       num_entries++;
1430     }
1431   }
1432 
1433   if (num_entries < nFlags) {
1434     // Return array of right length
1435     objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1436     for(int i = 0; i < num_entries; i++) {
1437       res->obj_at_put(i, flags_ah->obj_at(i));
1438     }
1439     return (jobjectArray)JNIHandles::make_local(env, res);
1440   }
1441 
1442   return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1443 JVM_END
1444 
1445 // Utility function used by jmm_GetVMGlobals.  Returns false if flag type
1446 // can't be determined, true otherwise.  If false is returned, then *global
1447 // will be incomplete and invalid.
1448 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
1449   Handle flag_name;
1450   if (name() == NULL) {
1451     flag_name = java_lang_String::create_from_str(flag->_name, CHECK_false);
1452   } else {
1453     flag_name = name;
1454   }
1455   global->name = (jstring)JNIHandles::make_local(env, flag_name());
1456 
1457   if (flag->is_bool()) {
1458     global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1459     global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1460   } else if (flag->is_int()) {
1461     global->value.j = (jlong)flag->get_int();
1462     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1463   } else if (flag->is_uint()) {
1464     global->value.j = (jlong)flag->get_uint();
1465     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1466   } else if (flag->is_intx()) {
1467     global->value.j = (jlong)flag->get_intx();
1468     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1469   } else if (flag->is_uintx()) {
1470     global->value.j = (jlong)flag->get_uintx();
1471     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1472   } else if (flag->is_uint64_t()) {
1473     global->value.j = (jlong)flag->get_uint64_t();
1474     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1475   } else if (flag->is_double()) {
1476     global->value.d = (jdouble)flag->get_double();
1477     global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1478   } else if (flag->is_size_t()) {
1479     global->value.j = (jlong)flag->get_size_t();
1480     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1481   } else if (flag->is_ccstr()) {
1482     Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1483     global->value.l = (jobject)JNIHandles::make_local(env, str());
1484     global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1485   } else {
1486     global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1487     return false;
1488   }
1489 
1490   global->writeable = flag->is_writeable();
1491   global->external = flag->is_external();
1492   switch (flag->get_origin()) {
1493     case Flag::DEFAULT:
1494       global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1495       break;
1496     case Flag::COMMAND_LINE:
1497       global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1498       break;
1499     case Flag::ENVIRON_VAR:
1500       global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1501       break;
1502     case Flag::CONFIG_FILE:
1503       global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1504       break;
1505     case Flag::MANAGEMENT:
1506       global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1507       break;
1508     case Flag::ERGONOMIC:
1509       global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1510       break;
1511     case Flag::ATTACH_ON_DEMAND:
1512       global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1513       break;
1514     default:
1515       global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1516   }
1517 
1518   return true;
1519 }
1520 
1521 // Fill globals array of count length with jmmVMGlobal entries
1522 // specified by names. If names == NULL, fill globals array
1523 // with all Flags. Return value is number of entries
1524 // created in globals.
1525 // If a Flag with a given name in an array element does not
1526 // exist, globals[i].name will be set to NULL.
1527 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1528                                  jobjectArray names,
1529                                  jmmVMGlobal *globals,
1530                                  jint count))
1531 
1532 
1533   if (globals == NULL) {
1534     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1535   }
1536 
1537   ResourceMark rm(THREAD);
1538 
1539   if (names != NULL) {
1540     // return the requested globals
1541     objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1542     objArrayHandle names_ah(THREAD, ta);
1543     // Make sure we have a String array
1544     Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1545     if (element_klass != SystemDictionary::String_klass()) {
1546       THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1547                  "Array element type is not String class", 0);
1548     }
1549 
1550     int names_length = names_ah->length();
1551     int num_entries = 0;
1552     for (int i = 0; i < names_length && i < count; i++) {
1553       oop s = names_ah->obj_at(i);
1554       if (s == NULL) {
1555         THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1556       }
1557 
1558       Handle sh(THREAD, s);
1559       char* str = java_lang_String::as_utf8_string(s);
1560       Flag* flag = Flag::find_flag(str, strlen(str));
1561       if (flag != NULL &&
1562           add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1563         num_entries++;
1564       } else {
1565         globals[i].name = NULL;
1566       }
1567     }
1568     return num_entries;
1569   } else {
1570     // return all globals if names == NULL
1571 
1572     // last flag entry is always NULL, so subtract 1
1573     int nFlags = (int) Flag::numFlags - 1;
1574     Handle null_h;
1575     int num_entries = 0;
1576     for (int i = 0; i < nFlags && num_entries < count;  i++) {
1577       Flag* flag = &Flag::flags[i];
1578       // Exclude notproduct and develop flags in product builds.
1579       if (flag->is_constant_in_binary()) {
1580         continue;
1581       }
1582       // Exclude the locked (diagnostic, experimental) flags
1583       if ((flag->is_unlocked() || flag->is_unlocker()) &&
1584           add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1585         num_entries++;
1586       }
1587     }
1588     return num_entries;
1589   }
1590 JVM_END
1591 
1592 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1593   ResourceMark rm(THREAD);
1594 
1595   oop fn = JNIHandles::resolve_external_guard(flag_name);
1596   if (fn == NULL) {
1597     THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1598               "The flag name cannot be null.");
1599   }
1600   char* name = java_lang_String::as_utf8_string(fn);
1601 
1602   FormatBuffer<80> error_msg("%s", "");
1603   int succeed = WriteableFlags::set_flag(name, new_value, Flag::MANAGEMENT, error_msg);
1604 
1605   if (succeed != Flag::SUCCESS) {
1606     if (succeed == Flag::MISSING_VALUE) {
1607       // missing value causes NPE to be thrown
1608       THROW(vmSymbols::java_lang_NullPointerException());
1609     } else {
1610       // all the other errors are reported as IAE with the appropriate error message
1611       THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1612                 error_msg.buffer());
1613     }
1614   }
1615   assert(succeed == Flag::SUCCESS, "Setting flag should succeed");
1616 JVM_END
1617 
1618 class ThreadTimesClosure: public ThreadClosure {
1619  private:
1620   objArrayHandle _names_strings;
1621   char **_names_chars;
1622   typeArrayHandle _times;
1623   int _names_len;
1624   int _times_len;
1625   int _count;
1626 
1627  public:
1628   ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1629   ~ThreadTimesClosure();
1630   virtual void do_thread(Thread* thread);
1631   void do_unlocked();
1632   int count() { return _count; }
1633 };
1634 
1635 ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1636                                        typeArrayHandle times) {
1637   assert(names() != NULL, "names was NULL");
1638   assert(times() != NULL, "times was NULL");
1639   _names_strings = names;
1640   _names_len = names->length();
1641   _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1642   _times = times;
1643   _times_len = times->length();
1644   _count = 0;
1645 }
1646 
1647 //
1648 // Called with Threads_lock held
1649 //
1650 void ThreadTimesClosure::do_thread(Thread* thread) {
1651   assert(thread != NULL, "thread was NULL");
1652 
1653   // exclude externally visible JavaThreads
1654   if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1655     return;
1656   }
1657 
1658   if (_count >= _names_len || _count >= _times_len) {
1659     // skip if the result array is not big enough
1660     return;
1661   }
1662 
1663   EXCEPTION_MARK;
1664   ResourceMark rm(THREAD); // thread->name() uses ResourceArea
1665 
1666   assert(thread->name() != NULL, "All threads should have a name");
1667   _names_chars[_count] = os::strdup(thread->name());
1668   _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1669                         os::thread_cpu_time(thread) : -1);
1670   _count++;
1671 }
1672 
1673 // Called without Threads_lock, we can allocate String objects.
1674 void ThreadTimesClosure::do_unlocked() {
1675 
1676   EXCEPTION_MARK;
1677   for (int i = 0; i < _count; i++) {
1678     Handle s = java_lang_String::create_from_str(_names_chars[i],  CHECK);
1679     _names_strings->obj_at_put(i, s());
1680   }
1681 }
1682 
1683 ThreadTimesClosure::~ThreadTimesClosure() {
1684   for (int i = 0; i < _count; i++) {
1685     os::free(_names_chars[i]);
1686   }
1687   FREE_C_HEAP_ARRAY(char *, _names_chars);
1688 }
1689 
1690 // Fills names with VM internal thread names and times with the corresponding
1691 // CPU times.  If names or times is NULL, a NullPointerException is thrown.
1692 // If the element type of names is not String, an IllegalArgumentException is
1693 // thrown.
1694 // If an array is not large enough to hold all the entries, only the entries
1695 // that fit will be returned.  Return value is the number of VM internal
1696 // threads entries.
1697 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1698                                            jobjectArray names,
1699                                            jlongArray times))
1700   if (names == NULL || times == NULL) {
1701      THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1702   }
1703   objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1704   objArrayHandle names_ah(THREAD, na);
1705 
1706   // Make sure we have a String array
1707   Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1708   if (element_klass != SystemDictionary::String_klass()) {
1709     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1710                "Array element type is not String class", 0);
1711   }
1712 
1713   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1714   typeArrayHandle times_ah(THREAD, ta);
1715 
1716   ThreadTimesClosure ttc(names_ah, times_ah);
1717   {
1718     MutexLockerEx ml(Threads_lock);
1719     Threads::threads_do(&ttc);
1720   }
1721   ttc.do_unlocked();
1722   return ttc.count();
1723 JVM_END
1724 
1725 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1726   ResourceMark rm(THREAD);
1727 
1728   VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1729   VMThread::execute(&op);
1730 
1731   DeadlockCycle* deadlocks = op.result();
1732   if (deadlocks == NULL) {
1733     // no deadlock found and return
1734     return Handle();
1735   }
1736 
1737   int num_threads = 0;
1738   DeadlockCycle* cycle;
1739   for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1740     num_threads += cycle->num_threads();
1741   }
1742 
1743   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1744   objArrayHandle threads_ah(THREAD, r);
1745 
1746   int index = 0;
1747   for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1748     GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1749     int len = deadlock_threads->length();
1750     for (int i = 0; i < len; i++) {
1751       threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1752       index++;
1753     }
1754   }
1755   return threads_ah;
1756 }
1757 
1758 // Finds cycles of threads that are deadlocked involved in object monitors
1759 // and JSR-166 synchronizers.
1760 // Returns an array of Thread objects which are in deadlock, if any.
1761 // Otherwise, returns NULL.
1762 //
1763 // Input parameter:
1764 //    object_monitors_only - if true, only check object monitors
1765 //
1766 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1767   Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1768   return (jobjectArray) JNIHandles::make_local(env, result());
1769 JVM_END
1770 
1771 // Finds cycles of threads that are deadlocked on monitor locks
1772 // Returns an array of Thread objects which are in deadlock, if any.
1773 // Otherwise, returns NULL.
1774 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1775   Handle result = find_deadlocks(true, CHECK_0);
1776   return (jobjectArray) JNIHandles::make_local(env, result());
1777 JVM_END
1778 
1779 // Gets the information about GC extension attributes including
1780 // the name of the attribute, its type, and a short description.
1781 //
1782 // Input parameters:
1783 //   mgr   - GC memory manager
1784 //   info  - caller allocated array of jmmExtAttributeInfo
1785 //   count - number of elements of the info array
1786 //
1787 // Returns the number of GC extension attributes filled in the info array; or
1788 // -1 if info is not big enough
1789 //
1790 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1791   // All GC memory managers have 1 attribute (number of GC threads)
1792   if (count == 0) {
1793     return 0;
1794   }
1795 
1796   if (info == NULL) {
1797    THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1798   }
1799 
1800   info[0].name = "GcThreadCount";
1801   info[0].type = 'I';
1802   info[0].description = "Number of GC threads";
1803   return 1;
1804 JVM_END
1805 
1806 // verify the given array is an array of java/lang/management/MemoryUsage objects
1807 // of a given length and return the objArrayOop
1808 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1809   if (array == NULL) {
1810     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1811   }
1812 
1813   objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1814   objArrayHandle array_h(THREAD, oa);
1815 
1816   // array must be of the given length
1817   if (length != array_h->length()) {
1818     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1819                "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1820   }
1821 
1822   // check if the element of array is of type MemoryUsage class
1823   Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1824   Klass* element_klass = ObjArrayKlass::cast(array_h->klass())->element_klass();
1825   if (element_klass != usage_klass) {
1826     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1827                "The element type is not MemoryUsage class", 0);
1828   }
1829 
1830   return array_h();
1831 }
1832 
1833 // Gets the statistics of the last GC of a given GC memory manager.
1834 // Input parameters:
1835 //   obj     - GarbageCollectorMXBean object
1836 //   gc_stat - caller allocated jmmGCStat where:
1837 //     a. before_gc_usage - array of MemoryUsage objects
1838 //     b. after_gc_usage  - array of MemoryUsage objects
1839 //     c. gc_ext_attributes_values_size is set to the
1840 //        gc_ext_attribute_values array allocated
1841 //     d. gc_ext_attribute_values is a caller allocated array of jvalue.
1842 //
1843 // On return,
1844 //   gc_index == 0 indicates no GC statistics available
1845 //
1846 //   before_gc_usage and after_gc_usage - filled with per memory pool
1847 //      before and after GC usage in the same order as the memory pools
1848 //      returned by GetMemoryPools for a given GC memory manager.
1849 //   num_gc_ext_attributes indicates the number of elements in
1850 //      the gc_ext_attribute_values array is filled; or
1851 //      -1 if the gc_ext_attributes_values array is not big enough
1852 //
1853 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
1854   ResourceMark rm(THREAD);
1855 
1856   if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
1857     THROW(vmSymbols::java_lang_NullPointerException());
1858   }
1859 
1860   // Get the GCMemoryManager
1861   GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1862 
1863   // Make a copy of the last GC statistics
1864   // GC may occur while constructing the last GC information
1865   int num_pools = MemoryService::num_memory_pools();
1866   GCStatInfo stat(num_pools);
1867   if (mgr->get_last_gc_stat(&stat) == 0) {
1868     gc_stat->gc_index = 0;
1869     return;
1870   }
1871 
1872   gc_stat->gc_index = stat.gc_index();
1873   gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
1874   gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
1875 
1876   // Current implementation does not have GC extension attributes
1877   gc_stat->num_gc_ext_attributes = 0;
1878 
1879   // Fill the arrays of MemoryUsage objects with before and after GC
1880   // per pool memory usage
1881   objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
1882                                              num_pools,
1883                                              CHECK);
1884   objArrayHandle usage_before_gc_ah(THREAD, bu);
1885 
1886   objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
1887                                              num_pools,
1888                                              CHECK);
1889   objArrayHandle usage_after_gc_ah(THREAD, au);
1890 
1891   for (int i = 0; i < num_pools; i++) {
1892     Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
1893     Handle after_usage;
1894 
1895     MemoryUsage u = stat.after_gc_usage_for_pool(i);
1896     if (u.max_size() == 0 && u.used() > 0) {
1897       // If max size == 0, this pool is a survivor space.
1898       // Set max size = -1 since the pools will be swapped after GC.
1899       MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
1900       after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
1901     } else {
1902       after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
1903     }
1904     usage_before_gc_ah->obj_at_put(i, before_usage());
1905     usage_after_gc_ah->obj_at_put(i, after_usage());
1906   }
1907 
1908   if (gc_stat->gc_ext_attribute_values_size > 0) {
1909     // Current implementation only has 1 attribute (number of GC threads)
1910     // The type is 'I'
1911     gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
1912   }
1913 JVM_END
1914 
1915 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
1916   ResourceMark rm(THREAD);
1917   // Get the GCMemoryManager
1918   GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1919   mgr->set_notification_enabled(enabled?true:false);
1920 JVM_END
1921 
1922 // Dump heap - Returns 0 if succeeds.
1923 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
1924 #if INCLUDE_SERVICES
1925   ResourceMark rm(THREAD);
1926   oop on = JNIHandles::resolve_external_guard(outputfile);
1927   if (on == NULL) {
1928     THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1929                "Output file name cannot be null.", -1);
1930   }
1931   Handle onhandle(THREAD, on);
1932   char* name = java_lang_String::as_platform_dependent_str(onhandle, CHECK_(-1));
1933   if (name == NULL) {
1934     THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1935                "Output file name cannot be null.", -1);
1936   }
1937   HeapDumper dumper(live ? true : false);
1938   if (dumper.dump(name) != 0) {
1939     const char* errmsg = dumper.error_as_C_string();
1940     THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1941   }
1942   return 0;
1943 #else  // INCLUDE_SERVICES
1944   return -1;
1945 #endif // INCLUDE_SERVICES
1946 JVM_END
1947 
1948 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1949   ResourceMark rm(THREAD);
1950   GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1951   objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
1952           dcmd_list->length(), CHECK_NULL);
1953   objArrayHandle cmd_array(THREAD, cmd_array_oop);
1954   for (int i = 0; i < dcmd_list->length(); i++) {
1955     oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1956     cmd_array->obj_at_put(i, cmd_name);
1957   }
1958   return (jobjectArray) JNIHandles::make_local(env, cmd_array());
1959 JVM_END
1960 
1961 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1962           dcmdInfo* infoArray))
1963   if (cmds == NULL || infoArray == NULL) {
1964     THROW(vmSymbols::java_lang_NullPointerException());
1965   }
1966 
1967   ResourceMark rm(THREAD);
1968 
1969   objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
1970   objArrayHandle cmds_ah(THREAD, ca);
1971 
1972   // Make sure we have a String array
1973   Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
1974   if (element_klass != SystemDictionary::String_klass()) {
1975     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1976                "Array element type is not String class");
1977   }
1978 
1979   GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
1980 
1981   int num_cmds = cmds_ah->length();
1982   for (int i = 0; i < num_cmds; i++) {
1983     oop cmd = cmds_ah->obj_at(i);
1984     if (cmd == NULL) {
1985         THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1986                 "Command name cannot be null.");
1987     }
1988     char* cmd_name = java_lang_String::as_utf8_string(cmd);
1989     if (cmd_name == NULL) {
1990         THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1991                 "Command name cannot be null.");
1992     }
1993     int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
1994     if (pos == -1) {
1995         THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1996              "Unknown diagnostic command");
1997     }
1998     DCmdInfo* info = info_list->at(pos);
1999     infoArray[i].name = info->name();
2000     infoArray[i].description = info->description();
2001     infoArray[i].impact = info->impact();
2002     JavaPermission p = info->permission();
2003     infoArray[i].permission_class = p._class;
2004     infoArray[i].permission_name = p._name;
2005     infoArray[i].permission_action = p._action;
2006     infoArray[i].num_arguments = info->num_arguments();
2007     infoArray[i].enabled = info->is_enabled();
2008   }
2009 JVM_END
2010 
2011 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2012           jstring command, dcmdArgInfo* infoArray))
2013   ResourceMark rm(THREAD);
2014   oop cmd = JNIHandles::resolve_external_guard(command);
2015   if (cmd == NULL) {
2016     THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2017               "Command line cannot be null.");
2018   }
2019   char* cmd_name = java_lang_String::as_utf8_string(cmd);
2020   if (cmd_name == NULL) {
2021     THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2022               "Command line content cannot be null.");
2023   }
2024   DCmd* dcmd = NULL;
2025   DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2026                                              strlen(cmd_name));
2027   if (factory != NULL) {
2028     dcmd = factory->create_resource_instance(NULL);
2029   }
2030   if (dcmd == NULL) {
2031     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2032               "Unknown diagnostic command");
2033   }
2034   DCmdMark mark(dcmd);
2035   GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2036   if (array->length() == 0) {
2037     return;
2038   }
2039   for (int i = 0; i < array->length(); i++) {
2040     infoArray[i].name = array->at(i)->name();
2041     infoArray[i].description = array->at(i)->description();
2042     infoArray[i].type = array->at(i)->type();
2043     infoArray[i].default_string = array->at(i)->default_string();
2044     infoArray[i].mandatory = array->at(i)->is_mandatory();
2045     infoArray[i].option = array->at(i)->is_option();
2046     infoArray[i].multiple = array->at(i)->is_multiple();
2047     infoArray[i].position = array->at(i)->position();
2048   }
2049   return;
2050 JVM_END
2051 
2052 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2053   ResourceMark rm(THREAD);
2054   oop cmd = JNIHandles::resolve_external_guard(commandline);
2055   if (cmd == NULL) {
2056     THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2057                    "Command line cannot be null.");
2058   }
2059   char* cmdline = java_lang_String::as_utf8_string(cmd);
2060   if (cmdline == NULL) {
2061     THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2062                    "Command line content cannot be null.");
2063   }
2064   bufferedStream output;
2065   DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2066   oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2067   return (jstring) JNIHandles::make_local(env, result);
2068 JVM_END
2069 
2070 JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2071   DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2072 JVM_END
2073 
2074 jlong Management::ticks_to_ms(jlong ticks) {
2075   assert(os::elapsed_frequency() > 0, "Must be non-zero");
2076   return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2077                  * (double)1000.0);
2078 }
2079 #endif // INCLUDE_MANAGEMENT
2080 
2081 // Gets an array containing the amount of memory allocated on the Java
2082 // heap for a set of threads (in bytes).  Each element of the array is
2083 // the amount of memory allocated for the thread ID specified in the
2084 // corresponding entry in the given array of thread IDs; or -1 if the
2085 // thread does not exist or has terminated.
2086 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2087                                              jlongArray sizeArray))
2088   // Check if threads is null
2089   if (ids == NULL || sizeArray == NULL) {
2090     THROW(vmSymbols::java_lang_NullPointerException());
2091   }
2092 
2093   ResourceMark rm(THREAD);
2094   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2095   typeArrayHandle ids_ah(THREAD, ta);
2096 
2097   typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2098   typeArrayHandle sizeArray_h(THREAD, sa);
2099 
2100   // validate the thread id array
2101   validate_thread_id_array(ids_ah, CHECK);
2102 
2103   // sizeArray must be of the same length as the given array of thread IDs
2104   int num_threads = ids_ah->length();
2105   if (num_threads != sizeArray_h->length()) {
2106     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2107               "The length of the given long array does not match the length of "
2108               "the given array of thread IDs");
2109   }
2110 
2111   MutexLockerEx ml(Threads_lock);
2112   for (int i = 0; i < num_threads; i++) {
2113     JavaThread* java_thread = Threads::find_java_thread_from_java_tid(ids_ah->long_at(i));
2114     if (java_thread != NULL) {
2115       sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2116     }
2117   }
2118 JVM_END
2119 
2120 // Returns the CPU time consumed by a given thread (in nanoseconds).
2121 // If thread_id == 0, CPU time for the current thread is returned.
2122 // If user_sys_cpu_time = true, user level and system CPU time of
2123 // a given thread is returned; otherwise, only user level CPU time
2124 // is returned.
2125 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2126   if (!os::is_thread_cpu_time_supported()) {
2127     return -1;
2128   }
2129 
2130   if (thread_id < 0) {
2131     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2132                "Invalid thread ID", -1);
2133   }
2134 
2135   JavaThread* java_thread = NULL;
2136   if (thread_id == 0) {
2137     // current thread
2138     return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2139   } else {
2140     MutexLockerEx ml(Threads_lock);
2141     java_thread = Threads::find_java_thread_from_java_tid(thread_id);
2142     if (java_thread != NULL) {
2143       return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2144     }
2145   }
2146   return -1;
2147 JVM_END
2148 
2149 // Gets an array containing the CPU times consumed by a set of threads
2150 // (in nanoseconds).  Each element of the array is the CPU time for the
2151 // thread ID specified in the corresponding entry in the given array
2152 // of thread IDs; or -1 if the thread does not exist or has terminated.
2153 // If user_sys_cpu_time = true, the sum of user level and system CPU time
2154 // for the given thread is returned; otherwise, only user level CPU time
2155 // is returned.
2156 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2157                                               jlongArray timeArray,
2158                                               jboolean user_sys_cpu_time))
2159   // Check if threads is null
2160   if (ids == NULL || timeArray == NULL) {
2161     THROW(vmSymbols::java_lang_NullPointerException());
2162   }
2163 
2164   ResourceMark rm(THREAD);
2165   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2166   typeArrayHandle ids_ah(THREAD, ta);
2167 
2168   typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2169   typeArrayHandle timeArray_h(THREAD, tia);
2170 
2171   // validate the thread id array
2172   validate_thread_id_array(ids_ah, CHECK);
2173 
2174   // timeArray must be of the same length as the given array of thread IDs
2175   int num_threads = ids_ah->length();
2176   if (num_threads != timeArray_h->length()) {
2177     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2178               "The length of the given long array does not match the length of "
2179               "the given array of thread IDs");
2180   }
2181 
2182   MutexLockerEx ml(Threads_lock);
2183   for (int i = 0; i < num_threads; i++) {
2184     JavaThread* java_thread = Threads::find_java_thread_from_java_tid(ids_ah->long_at(i));
2185     if (java_thread != NULL) {
2186       timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2187                                                       user_sys_cpu_time != 0));
2188     }
2189   }
2190 JVM_END
2191 
2192 
2193 
2194 #if INCLUDE_MANAGEMENT
2195 const struct jmmInterface_1_ jmm_interface = {
2196   NULL,
2197   NULL,
2198   jmm_GetVersion,
2199   jmm_GetOptionalSupport,
2200   jmm_GetThreadInfo,
2201   jmm_GetMemoryPools,
2202   jmm_GetMemoryManagers,
2203   jmm_GetMemoryPoolUsage,
2204   jmm_GetPeakMemoryPoolUsage,
2205   jmm_GetThreadAllocatedMemory,
2206   jmm_GetMemoryUsage,
2207   jmm_GetLongAttribute,
2208   jmm_GetBoolAttribute,
2209   jmm_SetBoolAttribute,
2210   jmm_GetLongAttributes,
2211   jmm_FindMonitorDeadlockedThreads,
2212   jmm_GetThreadCpuTime,
2213   jmm_GetVMGlobalNames,
2214   jmm_GetVMGlobals,
2215   jmm_GetInternalThreadTimes,
2216   jmm_ResetStatistic,
2217   jmm_SetPoolSensor,
2218   jmm_SetPoolThreshold,
2219   jmm_GetPoolCollectionUsage,
2220   jmm_GetGCExtAttributeInfo,
2221   jmm_GetLastGCStat,
2222   jmm_GetThreadCpuTimeWithKind,
2223   jmm_GetThreadCpuTimesWithKind,
2224   jmm_DumpHeap0,
2225   jmm_FindDeadlockedThreads,
2226   jmm_SetVMGlobal,
2227   NULL,
2228   jmm_DumpThreads,
2229   jmm_SetGCNotificationEnabled,
2230   jmm_GetDiagnosticCommands,
2231   jmm_GetDiagnosticCommandInfo,
2232   jmm_GetDiagnosticCommandArgumentsInfo,
2233   jmm_ExecuteDiagnosticCommand,
2234   jmm_SetDiagnosticFrameworkNotificationEnabled
2235 };
2236 #endif // INCLUDE_MANAGEMENT
2237 
2238 void* Management::get_jmm_interface(int version) {
2239 #if INCLUDE_MANAGEMENT
2240   if (version == JMM_VERSION_1_0) {
2241     return (void*) &jmm_interface;
2242   }
2243 #endif // INCLUDE_MANAGEMENT
2244   return NULL;
2245 }