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, CHECK_NULL);
 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, CHECK_NULL);
 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   // Calculate the memory usage
 717   size_t total_init = 0;
 718   size_t total_used = 0;
 719   size_t total_committed = 0;
 720   size_t total_max = 0;
 721   bool   has_undefined_init_size = false;
 722   bool   has_undefined_max_size = false;
 723 
 724   for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
 725     MemoryPool* pool = MemoryService::get_memory_pool(i);
 726     if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
 727       MemoryUsage u = pool->get_memory_usage();
 728       total_used += u.used();
 729       total_committed += u.committed();
 730 
 731       if (u.init_size() == (size_t)-1) {
 732         has_undefined_init_size = true;
 733       }
 734       if (!has_undefined_init_size) {
 735         total_init += u.init_size();
 736       }
 737 
 738       if (u.max_size() == (size_t)-1) {
 739         has_undefined_max_size = true;
 740       }
 741       if (!has_undefined_max_size) {
 742         total_max += u.max_size();
 743       }
 744     }
 745   }
 746 
 747   // if any one of the memory pool has undefined init_size or max_size,
 748   // set it to -1
 749   if (has_undefined_init_size) {
 750     total_init = (size_t)-1;
 751   }
 752   if (has_undefined_max_size) {
 753     total_max = (size_t)-1;
 754   }
 755 
 756   MemoryUsage usage((heap ? InitialHeapSize : total_init),
 757                     total_used,
 758                     total_committed,
 759                     (heap ? Universe::heap()->max_capacity() : total_max));
 760 
 761   Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 762   return JNIHandles::make_local(env, obj());
 763 JVM_END
 764 
 765 // Returns the boolean value of a given attribute.
 766 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
 767   switch (att) {
 768   case JMM_VERBOSE_GC:
 769     return MemoryService::get_verbose();
 770   case JMM_VERBOSE_CLASS:
 771     return ClassLoadingService::get_verbose();
 772   case JMM_THREAD_CONTENTION_MONITORING:
 773     return ThreadService::is_thread_monitoring_contention();
 774   case JMM_THREAD_CPU_TIME:
 775     return ThreadService::is_thread_cpu_time_enabled();
 776   case JMM_THREAD_ALLOCATED_MEMORY:
 777     return ThreadService::is_thread_allocated_memory_enabled();
 778   default:
 779     assert(0, "Unrecognized attribute");
 780     return false;
 781   }
 782 JVM_END
 783 
 784 // Sets the given boolean attribute and returns the previous value.
 785 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
 786   switch (att) {
 787   case JMM_VERBOSE_GC:
 788     return MemoryService::set_verbose(flag != 0);
 789   case JMM_VERBOSE_CLASS:
 790     return ClassLoadingService::set_verbose(flag != 0);
 791   case JMM_THREAD_CONTENTION_MONITORING:
 792     return ThreadService::set_thread_monitoring_contention(flag != 0);
 793   case JMM_THREAD_CPU_TIME:
 794     return ThreadService::set_thread_cpu_time_enabled(flag != 0);
 795   case JMM_THREAD_ALLOCATED_MEMORY:
 796     return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
 797   default:
 798     assert(0, "Unrecognized attribute");
 799     return false;
 800   }
 801 JVM_END
 802 
 803 
 804 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
 805   switch (att) {
 806   case JMM_GC_TIME_MS:
 807     return mgr->gc_time_ms();
 808 
 809   case JMM_GC_COUNT:
 810     return mgr->gc_count();
 811 
 812   case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
 813     // current implementation only has 1 ext attribute
 814     return 1;
 815 
 816   default:
 817     assert(0, "Unrecognized GC attribute");
 818     return -1;
 819   }
 820 }
 821 
 822 class VmThreadCountClosure: public ThreadClosure {
 823  private:
 824   int _count;
 825  public:
 826   VmThreadCountClosure() : _count(0) {};
 827   void do_thread(Thread* thread);
 828   int count() { return _count; }
 829 };
 830 
 831 void VmThreadCountClosure::do_thread(Thread* thread) {
 832   // exclude externally visible JavaThreads
 833   if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
 834     return;
 835   }
 836 
 837   _count++;
 838 }
 839 
 840 static jint get_vm_thread_count() {
 841   VmThreadCountClosure vmtcc;
 842   {
 843     MutexLockerEx ml(Threads_lock);
 844     Threads::threads_do(&vmtcc);
 845   }
 846 
 847   return vmtcc.count();
 848 }
 849 
 850 static jint get_num_flags() {
 851   // last flag entry is always NULL, so subtract 1
 852   int nFlags = (int) JVMFlag::numFlags - 1;
 853   int count = 0;
 854   for (int i = 0; i < nFlags; i++) {
 855     JVMFlag* flag = &JVMFlag::flags[i];
 856     // Exclude the locked (diagnostic, experimental) flags
 857     if (flag->is_unlocked() || flag->is_unlocker()) {
 858       count++;
 859     }
 860   }
 861   return count;
 862 }
 863 
 864 static jlong get_long_attribute(jmmLongAttribute att) {
 865   switch (att) {
 866   case JMM_CLASS_LOADED_COUNT:
 867     return ClassLoadingService::loaded_class_count();
 868 
 869   case JMM_CLASS_UNLOADED_COUNT:
 870     return ClassLoadingService::unloaded_class_count();
 871 
 872   case JMM_THREAD_TOTAL_COUNT:
 873     return ThreadService::get_total_thread_count();
 874 
 875   case JMM_THREAD_LIVE_COUNT:
 876     return ThreadService::get_live_thread_count();
 877 
 878   case JMM_THREAD_PEAK_COUNT:
 879     return ThreadService::get_peak_thread_count();
 880 
 881   case JMM_THREAD_DAEMON_COUNT:
 882     return ThreadService::get_daemon_thread_count();
 883 
 884   case JMM_JVM_INIT_DONE_TIME_MS:
 885     return Management::vm_init_done_time();
 886 
 887   case JMM_JVM_UPTIME_MS:
 888     return Management::ticks_to_ms(os::elapsed_counter());
 889 
 890   case JMM_COMPILE_TOTAL_TIME_MS:
 891     return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
 892 
 893   case JMM_OS_PROCESS_ID:
 894     return os::current_process_id();
 895 
 896   // Hotspot-specific counters
 897   case JMM_CLASS_LOADED_BYTES:
 898     return ClassLoadingService::loaded_class_bytes();
 899 
 900   case JMM_CLASS_UNLOADED_BYTES:
 901     return ClassLoadingService::unloaded_class_bytes();
 902 
 903   case JMM_SHARED_CLASS_LOADED_COUNT:
 904     return ClassLoadingService::loaded_shared_class_count();
 905 
 906   case JMM_SHARED_CLASS_UNLOADED_COUNT:
 907     return ClassLoadingService::unloaded_shared_class_count();
 908 
 909 
 910   case JMM_SHARED_CLASS_LOADED_BYTES:
 911     return ClassLoadingService::loaded_shared_class_bytes();
 912 
 913   case JMM_SHARED_CLASS_UNLOADED_BYTES:
 914     return ClassLoadingService::unloaded_shared_class_bytes();
 915 
 916   case JMM_TOTAL_CLASSLOAD_TIME_MS:
 917     return ClassLoader::classloader_time_ms();
 918 
 919   case JMM_VM_GLOBAL_COUNT:
 920     return get_num_flags();
 921 
 922   case JMM_SAFEPOINT_COUNT:
 923     return RuntimeService::safepoint_count();
 924 
 925   case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
 926     return RuntimeService::safepoint_sync_time_ms();
 927 
 928   case JMM_TOTAL_STOPPED_TIME_MS:
 929     return RuntimeService::safepoint_time_ms();
 930 
 931   case JMM_TOTAL_APP_TIME_MS:
 932     return RuntimeService::application_time_ms();
 933 
 934   case JMM_VM_THREAD_COUNT:
 935     return get_vm_thread_count();
 936 
 937   case JMM_CLASS_INIT_TOTAL_COUNT:
 938     return ClassLoader::class_init_count();
 939 
 940   case JMM_CLASS_INIT_TOTAL_TIME_MS:
 941     return ClassLoader::class_init_time_ms();
 942 
 943   case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
 944     return ClassLoader::class_verify_time_ms();
 945 
 946   case JMM_METHOD_DATA_SIZE_BYTES:
 947     return ClassLoadingService::class_method_data_size();
 948 
 949   case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
 950     return os::physical_memory();
 951 
 952   default:
 953     return -1;
 954   }
 955 }
 956 
 957 
 958 // Returns the long value of a given attribute.
 959 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
 960   if (obj == NULL) {
 961     return get_long_attribute(att);
 962   } else {
 963     GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
 964     if (mgr != NULL) {
 965       return get_gc_attribute(mgr, att);
 966     }
 967   }
 968   return -1;
 969 JVM_END
 970 
 971 // Gets the value of all attributes specified in the given array
 972 // and sets the value in the result array.
 973 // Returns the number of attributes found.
 974 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
 975                                       jobject obj,
 976                                       jmmLongAttribute* atts,
 977                                       jint count,
 978                                       jlong* result))
 979 
 980   int num_atts = 0;
 981   if (obj == NULL) {
 982     for (int i = 0; i < count; i++) {
 983       result[i] = get_long_attribute(atts[i]);
 984       if (result[i] != -1) {
 985         num_atts++;
 986       }
 987     }
 988   } else {
 989     GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
 990     for (int i = 0; i < count; i++) {
 991       result[i] = get_gc_attribute(mgr, atts[i]);
 992       if (result[i] != -1) {
 993         num_atts++;
 994       }
 995     }
 996   }
 997   return num_atts;
 998 JVM_END
 999 
1000 // Helper function to do thread dump for a specific list of threads
1001 static void do_thread_dump(ThreadDumpResult* dump_result,
1002                            typeArrayHandle ids_ah,  // array of thread ID (long[])
1003                            int num_threads,
1004                            int max_depth,
1005                            bool with_locked_monitors,
1006                            bool with_locked_synchronizers,
1007                            TRAPS) {
1008   // no need to actually perform thread dump if no TIDs are specified
1009   if (num_threads == 0) return;
1010 
1011   // First get an array of threadObj handles.
1012   // A JavaThread may terminate before we get the stack trace.
1013   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1014 
1015   {
1016     // Need this ThreadsListHandle for converting Java thread IDs into
1017     // threadObj handles; dump_result->set_t_list() is called in the
1018     // VM op below so we can't use it yet.
1019     ThreadsListHandle tlh;
1020     for (int i = 0; i < num_threads; i++) {
1021       jlong tid = ids_ah->long_at(i);
1022       JavaThread* jt = tlh.list()->find_JavaThread_from_java_tid(tid);
1023       oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1024       instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1025       thread_handle_array->append(threadObj_h);
1026     }
1027   }
1028 
1029   // Obtain thread dumps and thread snapshot information
1030   VM_ThreadDump op(dump_result,
1031                    thread_handle_array,
1032                    num_threads,
1033                    max_depth, /* stack depth */
1034                    with_locked_monitors,
1035                    with_locked_synchronizers);
1036   VMThread::execute(&op);
1037 }
1038 
1039 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1040 // for the thread ID specified in the corresponding entry in
1041 // the given array of thread IDs; or NULL if the thread does not exist
1042 // or has terminated.
1043 //
1044 // Input parameters:
1045 //   ids       - array of thread IDs
1046 //   maxDepth  - the maximum depth of stack traces to be dumped:
1047 //               maxDepth == -1 requests to dump entire stack trace.
1048 //               maxDepth == 0  requests no stack trace.
1049 //   infoArray - array of ThreadInfo objects
1050 //
1051 // QQQ - Why does this method return a value instead of void?
1052 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1053   // Check if threads is null
1054   if (ids == NULL || infoArray == NULL) {
1055     THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1056   }
1057 
1058   if (maxDepth < -1) {
1059     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1060                "Invalid maxDepth", -1);
1061   }
1062 
1063   ResourceMark rm(THREAD);
1064   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1065   typeArrayHandle ids_ah(THREAD, ta);
1066 
1067   oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1068   objArrayOop oa = objArrayOop(infoArray_obj);
1069   objArrayHandle infoArray_h(THREAD, oa);
1070 
1071   // validate the thread id array
1072   validate_thread_id_array(ids_ah, CHECK_0);
1073 
1074   // validate the ThreadInfo[] parameters
1075   validate_thread_info_array(infoArray_h, CHECK_0);
1076 
1077   // infoArray must be of the same length as the given array of thread IDs
1078   int num_threads = ids_ah->length();
1079   if (num_threads != infoArray_h->length()) {
1080     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1081                "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1082   }
1083 



1084   // Must use ThreadDumpResult to store the ThreadSnapshot.
1085   // GC may occur after the thread snapshots are taken but before
1086   // this function returns. The threadObj and other oops kept
1087   // in the ThreadSnapshot are marked and adjusted during GC.
1088   ThreadDumpResult dump_result(num_threads);
1089 
1090   if (maxDepth == 0) {
1091     // No stack trace to dump so we do not need to stop the world.
1092     // Since we never do the VM op here we must set the threads list.
1093     dump_result.set_t_list();
1094     for (int i = 0; i < num_threads; i++) {
1095       jlong tid = ids_ah->long_at(i);
1096       JavaThread* jt = dump_result.t_list()->find_JavaThread_from_java_tid(tid);
1097       ThreadSnapshot* ts;
1098       if (jt == NULL) {
1099         // if the thread does not exist or now it is terminated,
1100         // create dummy snapshot
1101         ts = new ThreadSnapshot();
1102       } else {
1103         ts = new ThreadSnapshot(dump_result.t_list(), jt);
1104       }
1105       dump_result.add_thread_snapshot(ts);
1106     }
1107   } else {
1108     // obtain thread dump with the specific list of threads with stack trace
1109     do_thread_dump(&dump_result,
1110                    ids_ah,
1111                    num_threads,
1112                    maxDepth,
1113                    false, /* no locked monitor */
1114                    false, /* no locked synchronizers */
1115                    CHECK_0);
1116   }
1117 
1118   int num_snapshots = dump_result.num_snapshots();
1119   assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1120   assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1121   int index = 0;
1122   for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1123     // For each thread, create an java/lang/management/ThreadInfo object
1124     // and fill with the thread information
1125 
1126     if (ts->threadObj() == NULL) {
1127      // if the thread does not exist or now it is terminated, set threadinfo to NULL
1128       infoArray_h->obj_at_put(index, NULL);
1129       continue;
1130     }
1131 
1132     // Create java.lang.management.ThreadInfo object
1133     instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1134     infoArray_h->obj_at_put(index, info_obj);
1135   }
1136   return 0;
1137 JVM_END
1138 
1139 // Dump thread info for the specified threads.
1140 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1141 // for the thread ID specified in the corresponding entry in
1142 // the given array of thread IDs; or NULL if the thread does not exist
1143 // or has terminated.
1144 //
1145 // Input parameter:
1146 //    ids - array of thread IDs; NULL indicates all live threads
1147 //    locked_monitors - if true, dump locked object monitors
1148 //    locked_synchronizers - if true, dump locked JSR-166 synchronizers
1149 //
1150 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors,
1151                                         jboolean locked_synchronizers, jint maxDepth))
1152   ResourceMark rm(THREAD);



1153 
1154   typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1155   int num_threads = (ta != NULL ? ta->length() : 0);
1156   typeArrayHandle ids_ah(THREAD, ta);
1157 
1158   ThreadDumpResult dump_result(num_threads);  // can safepoint
1159 
1160   if (ids_ah() != NULL) {
1161 
1162     // validate the thread id array
1163     validate_thread_id_array(ids_ah, CHECK_NULL);
1164 
1165     // obtain thread dump of a specific list of threads
1166     do_thread_dump(&dump_result,
1167                    ids_ah,
1168                    num_threads,
1169                    maxDepth, /* stack depth */
1170                    (locked_monitors ? true : false),      /* with locked monitors */
1171                    (locked_synchronizers ? true : false), /* with locked synchronizers */
1172                    CHECK_NULL);
1173   } else {
1174     // obtain thread dump of all threads
1175     VM_ThreadDump op(&dump_result,
1176                      maxDepth, /* stack depth */
1177                      (locked_monitors ? true : false),     /* with locked monitors */
1178                      (locked_synchronizers ? true : false) /* with locked synchronizers */);
1179     VMThread::execute(&op);
1180   }
1181 
1182   int num_snapshots = dump_result.num_snapshots();
1183   assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1184 
1185   // create the result ThreadInfo[] object
1186   InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1187   objArrayOop r = oopFactory::new_objArray(ik, num_snapshots, CHECK_NULL);
1188   objArrayHandle result_h(THREAD, r);
1189 
1190   int index = 0;
1191   for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1192     if (ts->threadObj() == NULL) {
1193      // if the thread does not exist or now it is terminated, set threadinfo to NULL
1194       result_h->obj_at_put(index, NULL);
1195       continue;
1196     }
1197 
1198     ThreadStackTrace* stacktrace = ts->get_stack_trace();
1199     assert(stacktrace != NULL, "Must have a stack trace dumped");
1200 
1201     // Create Object[] filled with locked monitors
1202     // Create int[] filled with the stack depth where a monitor was locked
1203     int num_frames = stacktrace->get_stack_depth();
1204     int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1205 
1206     // Count the total number of locked monitors
1207     for (int i = 0; i < num_frames; i++) {
1208       StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1209       num_locked_monitors += frame->num_locked_monitors();
1210     }
1211 
1212     objArrayHandle monitors_array;
1213     typeArrayHandle depths_array;
1214     objArrayHandle synchronizers_array;
1215 
1216     if (locked_monitors) {
1217       // Constructs Object[] and int[] to contain the object monitor and the stack depth
1218       // where the thread locked it
1219       objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1220       objArrayHandle mh(THREAD, array);
1221       monitors_array = mh;
1222 
1223       typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1224       typeArrayHandle dh(THREAD, tarray);
1225       depths_array = dh;
1226 
1227       int count = 0;
1228       int j = 0;
1229       for (int depth = 0; depth < num_frames; depth++) {
1230         StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1231         int len = frame->num_locked_monitors();
1232         GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1233         for (j = 0; j < len; j++) {
1234           oop monitor = locked_monitors->at(j);
1235           assert(monitor != NULL, "must be a Java object");
1236           monitors_array->obj_at_put(count, monitor);
1237           depths_array->int_at_put(count, depth);
1238           count++;
1239         }
1240       }
1241 
1242       GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1243       for (j = 0; j < jni_locked_monitors->length(); j++) {
1244         oop object = jni_locked_monitors->at(j);
1245         assert(object != NULL, "must be a Java object");
1246         monitors_array->obj_at_put(count, object);
1247         // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1248         depths_array->int_at_put(count, -1);
1249         count++;
1250       }
1251       assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1252     }
1253 
1254     if (locked_synchronizers) {
1255       // Create Object[] filled with locked JSR-166 synchronizers
1256       assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1257       ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1258       GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1259       int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1260 
1261       objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1262       objArrayHandle sh(THREAD, array);
1263       synchronizers_array = sh;
1264 
1265       for (int k = 0; k < num_locked_synchronizers; k++) {
1266         synchronizers_array->obj_at_put(k, locks->at(k));
1267       }
1268     }
1269 
1270     // Create java.lang.management.ThreadInfo object
1271     instanceOop info_obj = Management::create_thread_info_instance(ts,
1272                                                                    monitors_array,
1273                                                                    depths_array,
1274                                                                    synchronizers_array,
1275                                                                    CHECK_NULL);
1276     result_h->obj_at_put(index, info_obj);
1277   }
1278 
1279   return (jobjectArray) JNIHandles::make_local(env, result_h());
1280 JVM_END
1281 
1282 // Reset statistic.  Return true if the requested statistic is reset.
1283 // Otherwise, return false.
1284 //
1285 // Input parameters:
1286 //  obj  - specify which instance the statistic associated with to be reset
1287 //         For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1288 //         For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1289 //  type - the type of statistic to be reset
1290 //
1291 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1292   ResourceMark rm(THREAD);
1293 
1294   switch (type) {
1295     case JMM_STAT_PEAK_THREAD_COUNT:
1296       ThreadService::reset_peak_thread_count();
1297       return true;
1298 
1299     case JMM_STAT_THREAD_CONTENTION_COUNT:
1300     case JMM_STAT_THREAD_CONTENTION_TIME: {
1301       jlong tid = obj.j;
1302       if (tid < 0) {
1303         THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1304       }
1305 
1306       // Look for the JavaThread of this given tid
1307       JavaThreadIteratorWithHandle jtiwh;
1308       if (tid == 0) {
1309         // reset contention statistics for all threads if tid == 0
1310         for (; JavaThread *java_thread = jtiwh.next(); ) {
1311           if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1312             ThreadService::reset_contention_count_stat(java_thread);
1313           } else {
1314             ThreadService::reset_contention_time_stat(java_thread);
1315           }
1316         }
1317       } else {
1318         // reset contention statistics for a given thread
1319         JavaThread* java_thread = jtiwh.list()->find_JavaThread_from_java_tid(tid);
1320         if (java_thread == NULL) {
1321           return false;
1322         }
1323 
1324         if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1325           ThreadService::reset_contention_count_stat(java_thread);
1326         } else {
1327           ThreadService::reset_contention_time_stat(java_thread);
1328         }
1329       }
1330       return true;
1331       break;
1332     }
1333     case JMM_STAT_PEAK_POOL_USAGE: {
1334       jobject o = obj.l;
1335       if (o == NULL) {
1336         THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1337       }
1338 
1339       oop pool_obj = JNIHandles::resolve(o);
1340       assert(pool_obj->is_instance(), "Should be an instanceOop");
1341       instanceHandle ph(THREAD, (instanceOop) pool_obj);
1342 
1343       MemoryPool* pool = MemoryService::get_memory_pool(ph);
1344       if (pool != NULL) {
1345         pool->reset_peak_memory_usage();
1346         return true;
1347       }
1348       break;
1349     }
1350     case JMM_STAT_GC_STAT: {
1351       jobject o = obj.l;
1352       if (o == NULL) {
1353         THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1354       }
1355 
1356       GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1357       if (mgr != NULL) {
1358         mgr->reset_gc_stat();
1359         return true;
1360       }
1361       break;
1362     }
1363     default:
1364       assert(0, "Unknown Statistic Type");
1365   }
1366   return false;
1367 JVM_END
1368 
1369 // Returns the fast estimate of CPU time consumed by
1370 // a given thread (in nanoseconds).
1371 // If thread_id == 0, return CPU time for the current thread.
1372 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1373   if (!os::is_thread_cpu_time_supported()) {
1374     return -1;
1375   }
1376 
1377   if (thread_id < 0) {
1378     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1379                "Invalid thread ID", -1);
1380   }
1381 
1382   JavaThread* java_thread = NULL;
1383   if (thread_id == 0) {
1384     // current thread
1385     return os::current_thread_cpu_time();
1386   } else {
1387     ThreadsListHandle tlh;
1388     java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
1389     if (java_thread != NULL) {
1390       return os::thread_cpu_time((Thread*) java_thread);
1391     }
1392   }
1393   return -1;
1394 JVM_END
1395 
1396 // Returns a String array of all VM global flag names
1397 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1398   // last flag entry is always NULL, so subtract 1
1399   int nFlags = (int) JVMFlag::numFlags - 1;
1400   // allocate a temp array
1401   objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1402                                            nFlags, CHECK_0);
1403   objArrayHandle flags_ah(THREAD, r);
1404   int num_entries = 0;
1405   for (int i = 0; i < nFlags; i++) {
1406     JVMFlag* flag = &JVMFlag::flags[i];
1407     // Exclude notproduct and develop flags in product builds.
1408     if (flag->is_constant_in_binary()) {
1409       continue;
1410     }
1411     // Exclude the locked (experimental, diagnostic) flags
1412     if (flag->is_unlocked() || flag->is_unlocker()) {
1413       Handle s = java_lang_String::create_from_str(flag->_name, CHECK_0);
1414       flags_ah->obj_at_put(num_entries, s());
1415       num_entries++;
1416     }
1417   }
1418 
1419   if (num_entries < nFlags) {
1420     // Return array of right length
1421     objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1422     for(int i = 0; i < num_entries; i++) {
1423       res->obj_at_put(i, flags_ah->obj_at(i));
1424     }
1425     return (jobjectArray)JNIHandles::make_local(env, res);
1426   }
1427 
1428   return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1429 JVM_END
1430 
1431 // Utility function used by jmm_GetVMGlobals.  Returns false if flag type
1432 // can't be determined, true otherwise.  If false is returned, then *global
1433 // will be incomplete and invalid.
1434 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, JVMFlag *flag, TRAPS) {
1435   Handle flag_name;
1436   if (name() == NULL) {
1437     flag_name = java_lang_String::create_from_str(flag->_name, CHECK_false);
1438   } else {
1439     flag_name = name;
1440   }
1441   global->name = (jstring)JNIHandles::make_local(env, flag_name());
1442 
1443   if (flag->is_bool()) {
1444     global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1445     global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1446   } else if (flag->is_int()) {
1447     global->value.j = (jlong)flag->get_int();
1448     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1449   } else if (flag->is_uint()) {
1450     global->value.j = (jlong)flag->get_uint();
1451     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1452   } else if (flag->is_intx()) {
1453     global->value.j = (jlong)flag->get_intx();
1454     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1455   } else if (flag->is_uintx()) {
1456     global->value.j = (jlong)flag->get_uintx();
1457     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1458   } else if (flag->is_uint64_t()) {
1459     global->value.j = (jlong)flag->get_uint64_t();
1460     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1461   } else if (flag->is_double()) {
1462     global->value.d = (jdouble)flag->get_double();
1463     global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1464   } else if (flag->is_size_t()) {
1465     global->value.j = (jlong)flag->get_size_t();
1466     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1467   } else if (flag->is_ccstr()) {
1468     Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1469     global->value.l = (jobject)JNIHandles::make_local(env, str());
1470     global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1471   } else {
1472     global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1473     return false;
1474   }
1475 
1476   global->writeable = flag->is_writeable();
1477   global->external = flag->is_external();
1478   switch (flag->get_origin()) {
1479     case JVMFlag::DEFAULT:
1480       global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1481       break;
1482     case JVMFlag::COMMAND_LINE:
1483       global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1484       break;
1485     case JVMFlag::ENVIRON_VAR:
1486       global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1487       break;
1488     case JVMFlag::CONFIG_FILE:
1489       global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1490       break;
1491     case JVMFlag::MANAGEMENT:
1492       global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1493       break;
1494     case JVMFlag::ERGONOMIC:
1495       global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1496       break;
1497     case JVMFlag::ATTACH_ON_DEMAND:
1498       global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1499       break;
1500     default:
1501       global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1502   }
1503 
1504   return true;
1505 }
1506 
1507 // Fill globals array of count length with jmmVMGlobal entries
1508 // specified by names. If names == NULL, fill globals array
1509 // with all Flags. Return value is number of entries
1510 // created in globals.
1511 // If a JVMFlag with a given name in an array element does not
1512 // exist, globals[i].name will be set to NULL.
1513 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1514                                  jobjectArray names,
1515                                  jmmVMGlobal *globals,
1516                                  jint count))
1517 
1518 
1519   if (globals == NULL) {
1520     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1521   }
1522 
1523   ResourceMark rm(THREAD);
1524 
1525   if (names != NULL) {
1526     // return the requested globals
1527     objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1528     objArrayHandle names_ah(THREAD, ta);
1529     // Make sure we have a String array
1530     Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1531     if (element_klass != SystemDictionary::String_klass()) {
1532       THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1533                  "Array element type is not String class", 0);
1534     }
1535 
1536     int names_length = names_ah->length();
1537     int num_entries = 0;
1538     for (int i = 0; i < names_length && i < count; i++) {
1539       oop s = names_ah->obj_at(i);
1540       if (s == NULL) {
1541         THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1542       }
1543 
1544       Handle sh(THREAD, s);
1545       char* str = java_lang_String::as_utf8_string(s);
1546       JVMFlag* flag = JVMFlag::find_flag(str, strlen(str));
1547       if (flag != NULL &&
1548           add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1549         num_entries++;
1550       } else {
1551         globals[i].name = NULL;
1552       }
1553     }
1554     return num_entries;
1555   } else {
1556     // return all globals if names == NULL
1557 
1558     // last flag entry is always NULL, so subtract 1
1559     int nFlags = (int) JVMFlag::numFlags - 1;
1560     Handle null_h;
1561     int num_entries = 0;
1562     for (int i = 0; i < nFlags && num_entries < count;  i++) {
1563       JVMFlag* flag = &JVMFlag::flags[i];
1564       // Exclude notproduct and develop flags in product builds.
1565       if (flag->is_constant_in_binary()) {
1566         continue;
1567       }
1568       // Exclude the locked (diagnostic, experimental) flags
1569       if ((flag->is_unlocked() || flag->is_unlocker()) &&
1570           add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1571         num_entries++;
1572       }
1573     }
1574     return num_entries;
1575   }
1576 JVM_END
1577 
1578 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1579   ResourceMark rm(THREAD);
1580 
1581   oop fn = JNIHandles::resolve_external_guard(flag_name);
1582   if (fn == NULL) {
1583     THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1584               "The flag name cannot be null.");
1585   }
1586   char* name = java_lang_String::as_utf8_string(fn);
1587 
1588   FormatBuffer<80> error_msg("%s", "");
1589   int succeed = WriteableFlags::set_flag(name, new_value, JVMFlag::MANAGEMENT, error_msg);
1590 
1591   if (succeed != JVMFlag::SUCCESS) {
1592     if (succeed == JVMFlag::MISSING_VALUE) {
1593       // missing value causes NPE to be thrown
1594       THROW(vmSymbols::java_lang_NullPointerException());
1595     } else {
1596       // all the other errors are reported as IAE with the appropriate error message
1597       THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1598                 error_msg.buffer());
1599     }
1600   }
1601   assert(succeed == JVMFlag::SUCCESS, "Setting flag should succeed");
1602 JVM_END
1603 
1604 class ThreadTimesClosure: public ThreadClosure {
1605  private:
1606   objArrayHandle _names_strings;
1607   char **_names_chars;
1608   typeArrayHandle _times;
1609   int _names_len;
1610   int _times_len;
1611   int _count;
1612 
1613  public:
1614   ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1615   ~ThreadTimesClosure();
1616   virtual void do_thread(Thread* thread);
1617   void do_unlocked();
1618   int count() { return _count; }
1619 };
1620 
1621 ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1622                                        typeArrayHandle times) {
1623   assert(names() != NULL, "names was NULL");
1624   assert(times() != NULL, "times was NULL");
1625   _names_strings = names;
1626   _names_len = names->length();
1627   _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1628   _times = times;
1629   _times_len = times->length();
1630   _count = 0;
1631 }
1632 
1633 //
1634 // Called with Threads_lock held
1635 //
1636 void ThreadTimesClosure::do_thread(Thread* thread) {
1637   assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
1638   assert(thread != NULL, "thread was NULL");
1639 
1640   // exclude externally visible JavaThreads
1641   if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1642     return;
1643   }
1644 
1645   if (_count >= _names_len || _count >= _times_len) {
1646     // skip if the result array is not big enough
1647     return;
1648   }
1649 
1650   EXCEPTION_MARK;
1651   ResourceMark rm(THREAD); // thread->name() uses ResourceArea
1652 
1653   assert(thread->name() != NULL, "All threads should have a name");
1654   _names_chars[_count] = os::strdup(thread->name());
1655   _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1656                         os::thread_cpu_time(thread) : -1);
1657   _count++;
1658 }
1659 
1660 // Called without Threads_lock, we can allocate String objects.
1661 void ThreadTimesClosure::do_unlocked() {
1662 
1663   EXCEPTION_MARK;
1664   for (int i = 0; i < _count; i++) {
1665     Handle s = java_lang_String::create_from_str(_names_chars[i],  CHECK);
1666     _names_strings->obj_at_put(i, s());
1667   }
1668 }
1669 
1670 ThreadTimesClosure::~ThreadTimesClosure() {
1671   for (int i = 0; i < _count; i++) {
1672     os::free(_names_chars[i]);
1673   }
1674   FREE_C_HEAP_ARRAY(char *, _names_chars);
1675 }
1676 
1677 // Fills names with VM internal thread names and times with the corresponding
1678 // CPU times.  If names or times is NULL, a NullPointerException is thrown.
1679 // If the element type of names is not String, an IllegalArgumentException is
1680 // thrown.
1681 // If an array is not large enough to hold all the entries, only the entries
1682 // that fit will be returned.  Return value is the number of VM internal
1683 // threads entries.
1684 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1685                                            jobjectArray names,
1686                                            jlongArray times))
1687   if (names == NULL || times == NULL) {
1688      THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1689   }
1690   objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1691   objArrayHandle names_ah(THREAD, na);
1692 
1693   // Make sure we have a String array
1694   Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1695   if (element_klass != SystemDictionary::String_klass()) {
1696     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1697                "Array element type is not String class", 0);
1698   }
1699 
1700   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1701   typeArrayHandle times_ah(THREAD, ta);
1702 
1703   ThreadTimesClosure ttc(names_ah, times_ah);
1704   {
1705     MutexLockerEx ml(Threads_lock);
1706     Threads::threads_do(&ttc);
1707   }
1708   ttc.do_unlocked();
1709   return ttc.count();
1710 JVM_END
1711 
1712 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1713   ResourceMark rm(THREAD);
1714 
1715   VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1716   VMThread::execute(&op);
1717 
1718   DeadlockCycle* deadlocks = op.result();
1719   if (deadlocks == NULL) {
1720     // no deadlock found and return
1721     return Handle();
1722   }
1723 
1724   int num_threads = 0;
1725   DeadlockCycle* cycle;
1726   for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1727     num_threads += cycle->num_threads();
1728   }
1729 
1730   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1731   objArrayHandle threads_ah(THREAD, r);
1732 
1733   int index = 0;
1734   for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1735     GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1736     int len = deadlock_threads->length();
1737     for (int i = 0; i < len; i++) {
1738       threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1739       index++;
1740     }
1741   }
1742   return threads_ah;
1743 }
1744 
1745 // Finds cycles of threads that are deadlocked involved in object monitors
1746 // and JSR-166 synchronizers.
1747 // Returns an array of Thread objects which are in deadlock, if any.
1748 // Otherwise, returns NULL.
1749 //
1750 // Input parameter:
1751 //    object_monitors_only - if true, only check object monitors
1752 //
1753 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1754   Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1755   return (jobjectArray) JNIHandles::make_local(env, result());
1756 JVM_END
1757 
1758 // Finds cycles of threads that are deadlocked on monitor locks
1759 // Returns an array of Thread objects which are in deadlock, if any.
1760 // Otherwise, returns NULL.
1761 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1762   Handle result = find_deadlocks(true, CHECK_0);
1763   return (jobjectArray) JNIHandles::make_local(env, result());
1764 JVM_END
1765 
1766 // Gets the information about GC extension attributes including
1767 // the name of the attribute, its type, and a short description.
1768 //
1769 // Input parameters:
1770 //   mgr   - GC memory manager
1771 //   info  - caller allocated array of jmmExtAttributeInfo
1772 //   count - number of elements of the info array
1773 //
1774 // Returns the number of GC extension attributes filled in the info array; or
1775 // -1 if info is not big enough
1776 //
1777 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1778   // All GC memory managers have 1 attribute (number of GC threads)
1779   if (count == 0) {
1780     return 0;
1781   }
1782 
1783   if (info == NULL) {
1784    THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1785   }
1786 
1787   info[0].name = "GcThreadCount";
1788   info[0].type = 'I';
1789   info[0].description = "Number of GC threads";
1790   return 1;
1791 JVM_END
1792 
1793 // verify the given array is an array of java/lang/management/MemoryUsage objects
1794 // of a given length and return the objArrayOop
1795 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1796   if (array == NULL) {
1797     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1798   }
1799 
1800   objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1801   objArrayHandle array_h(THREAD, oa);
1802 
1803   // array must be of the given length
1804   if (length != array_h->length()) {
1805     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1806                "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1807   }
1808 
1809   // check if the element of array is of type MemoryUsage class
1810   Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1811   Klass* element_klass = ObjArrayKlass::cast(array_h->klass())->element_klass();
1812   if (element_klass != usage_klass) {
1813     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1814                "The element type is not MemoryUsage class", 0);
1815   }
1816 
1817   return array_h();
1818 }
1819 
1820 // Gets the statistics of the last GC of a given GC memory manager.
1821 // Input parameters:
1822 //   obj     - GarbageCollectorMXBean object
1823 //   gc_stat - caller allocated jmmGCStat where:
1824 //     a. before_gc_usage - array of MemoryUsage objects
1825 //     b. after_gc_usage  - array of MemoryUsage objects
1826 //     c. gc_ext_attributes_values_size is set to the
1827 //        gc_ext_attribute_values array allocated
1828 //     d. gc_ext_attribute_values is a caller allocated array of jvalue.
1829 //
1830 // On return,
1831 //   gc_index == 0 indicates no GC statistics available
1832 //
1833 //   before_gc_usage and after_gc_usage - filled with per memory pool
1834 //      before and after GC usage in the same order as the memory pools
1835 //      returned by GetMemoryPools for a given GC memory manager.
1836 //   num_gc_ext_attributes indicates the number of elements in
1837 //      the gc_ext_attribute_values array is filled; or
1838 //      -1 if the gc_ext_attributes_values array is not big enough
1839 //
1840 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
1841   ResourceMark rm(THREAD);
1842 
1843   if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
1844     THROW(vmSymbols::java_lang_NullPointerException());
1845   }
1846 
1847   // Get the GCMemoryManager
1848   GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1849 
1850   // Make a copy of the last GC statistics
1851   // GC may occur while constructing the last GC information
1852   int num_pools = MemoryService::num_memory_pools();
1853   GCStatInfo stat(num_pools);
1854   if (mgr->get_last_gc_stat(&stat) == 0) {
1855     gc_stat->gc_index = 0;
1856     return;
1857   }
1858 
1859   gc_stat->gc_index = stat.gc_index();
1860   gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
1861   gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
1862 
1863   // Current implementation does not have GC extension attributes
1864   gc_stat->num_gc_ext_attributes = 0;
1865 
1866   // Fill the arrays of MemoryUsage objects with before and after GC
1867   // per pool memory usage
1868   objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
1869                                              num_pools,
1870                                              CHECK);
1871   objArrayHandle usage_before_gc_ah(THREAD, bu);
1872 
1873   objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
1874                                              num_pools,
1875                                              CHECK);
1876   objArrayHandle usage_after_gc_ah(THREAD, au);
1877 
1878   for (int i = 0; i < num_pools; i++) {
1879     Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
1880     Handle after_usage;
1881 
1882     MemoryUsage u = stat.after_gc_usage_for_pool(i);
1883     if (u.max_size() == 0 && u.used() > 0) {
1884       // If max size == 0, this pool is a survivor space.
1885       // Set max size = -1 since the pools will be swapped after GC.
1886       MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
1887       after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
1888     } else {
1889       after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
1890     }
1891     usage_before_gc_ah->obj_at_put(i, before_usage());
1892     usage_after_gc_ah->obj_at_put(i, after_usage());
1893   }
1894 
1895   if (gc_stat->gc_ext_attribute_values_size > 0) {
1896     // Current implementation only has 1 attribute (number of GC threads)
1897     // The type is 'I'
1898     gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
1899   }
1900 JVM_END
1901 
1902 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
1903   ResourceMark rm(THREAD);
1904   // Get the GCMemoryManager
1905   GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1906   mgr->set_notification_enabled(enabled?true:false);
1907 JVM_END
1908 
1909 // Dump heap - Returns 0 if succeeds.
1910 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
1911 #if INCLUDE_SERVICES
1912   ResourceMark rm(THREAD);
1913   oop on = JNIHandles::resolve_external_guard(outputfile);
1914   if (on == NULL) {
1915     THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1916                "Output file name cannot be null.", -1);
1917   }
1918   Handle onhandle(THREAD, on);
1919   char* name = java_lang_String::as_platform_dependent_str(onhandle, CHECK_(-1));
1920   if (name == NULL) {
1921     THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1922                "Output file name cannot be null.", -1);
1923   }
1924   HeapDumper dumper(live ? true : false);
1925   if (dumper.dump(name) != 0) {
1926     const char* errmsg = dumper.error_as_C_string();
1927     THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1928   }
1929   return 0;
1930 #else  // INCLUDE_SERVICES
1931   return -1;
1932 #endif // INCLUDE_SERVICES
1933 JVM_END
1934 
1935 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1936   ResourceMark rm(THREAD);
1937   GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1938   objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
1939           dcmd_list->length(), CHECK_NULL);
1940   objArrayHandle cmd_array(THREAD, cmd_array_oop);
1941   for (int i = 0; i < dcmd_list->length(); i++) {
1942     oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1943     cmd_array->obj_at_put(i, cmd_name);
1944   }
1945   return (jobjectArray) JNIHandles::make_local(env, cmd_array());
1946 JVM_END
1947 
1948 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1949           dcmdInfo* infoArray))
1950   if (cmds == NULL || infoArray == NULL) {
1951     THROW(vmSymbols::java_lang_NullPointerException());
1952   }
1953 
1954   ResourceMark rm(THREAD);
1955 
1956   objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
1957   objArrayHandle cmds_ah(THREAD, ca);
1958 
1959   // Make sure we have a String array
1960   Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
1961   if (element_klass != SystemDictionary::String_klass()) {
1962     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1963                "Array element type is not String class");
1964   }
1965 
1966   GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
1967 
1968   int num_cmds = cmds_ah->length();
1969   for (int i = 0; i < num_cmds; i++) {
1970     oop cmd = cmds_ah->obj_at(i);
1971     if (cmd == NULL) {
1972         THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1973                 "Command name cannot be null.");
1974     }
1975     char* cmd_name = java_lang_String::as_utf8_string(cmd);
1976     if (cmd_name == NULL) {
1977         THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1978                 "Command name cannot be null.");
1979     }
1980     int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
1981     if (pos == -1) {
1982         THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1983              "Unknown diagnostic command");
1984     }
1985     DCmdInfo* info = info_list->at(pos);
1986     infoArray[i].name = info->name();
1987     infoArray[i].description = info->description();
1988     infoArray[i].impact = info->impact();
1989     JavaPermission p = info->permission();
1990     infoArray[i].permission_class = p._class;
1991     infoArray[i].permission_name = p._name;
1992     infoArray[i].permission_action = p._action;
1993     infoArray[i].num_arguments = info->num_arguments();
1994     infoArray[i].enabled = info->is_enabled();
1995   }
1996 JVM_END
1997 
1998 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
1999           jstring command, dcmdArgInfo* infoArray))
2000   ResourceMark rm(THREAD);
2001   oop cmd = JNIHandles::resolve_external_guard(command);
2002   if (cmd == NULL) {
2003     THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2004               "Command line cannot be null.");
2005   }
2006   char* cmd_name = java_lang_String::as_utf8_string(cmd);
2007   if (cmd_name == NULL) {
2008     THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2009               "Command line content cannot be null.");
2010   }
2011   DCmd* dcmd = NULL;
2012   DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2013                                              strlen(cmd_name));
2014   if (factory != NULL) {
2015     dcmd = factory->create_resource_instance(NULL);
2016   }
2017   if (dcmd == NULL) {
2018     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2019               "Unknown diagnostic command");
2020   }
2021   DCmdMark mark(dcmd);
2022   GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2023   if (array->length() == 0) {
2024     return;
2025   }
2026   for (int i = 0; i < array->length(); i++) {
2027     infoArray[i].name = array->at(i)->name();
2028     infoArray[i].description = array->at(i)->description();
2029     infoArray[i].type = array->at(i)->type();
2030     infoArray[i].default_string = array->at(i)->default_string();
2031     infoArray[i].mandatory = array->at(i)->is_mandatory();
2032     infoArray[i].option = array->at(i)->is_option();
2033     infoArray[i].multiple = array->at(i)->is_multiple();
2034     infoArray[i].position = array->at(i)->position();
2035   }
2036   return;
2037 JVM_END
2038 
2039 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2040   ResourceMark rm(THREAD);
2041   oop cmd = JNIHandles::resolve_external_guard(commandline);
2042   if (cmd == NULL) {
2043     THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2044                    "Command line cannot be null.");
2045   }
2046   char* cmdline = java_lang_String::as_utf8_string(cmd);
2047   if (cmdline == NULL) {
2048     THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2049                    "Command line content cannot be null.");
2050   }
2051   bufferedStream output;
2052   DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2053   oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2054   return (jstring) JNIHandles::make_local(env, result);
2055 JVM_END
2056 
2057 JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2058   DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2059 JVM_END
2060 
2061 jlong Management::ticks_to_ms(jlong ticks) {
2062   assert(os::elapsed_frequency() > 0, "Must be non-zero");
2063   return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2064                  * (double)1000.0);
2065 }
2066 #endif // INCLUDE_MANAGEMENT
2067 
2068 // Gets an array containing the amount of memory allocated on the Java
2069 // heap for a set of threads (in bytes).  Each element of the array is
2070 // the amount of memory allocated for the thread ID specified in the
2071 // corresponding entry in the given array of thread IDs; or -1 if the
2072 // thread does not exist or has terminated.
2073 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2074                                              jlongArray sizeArray))
2075   // Check if threads is null
2076   if (ids == NULL || sizeArray == NULL) {
2077     THROW(vmSymbols::java_lang_NullPointerException());
2078   }
2079 
2080   ResourceMark rm(THREAD);
2081   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2082   typeArrayHandle ids_ah(THREAD, ta);
2083 
2084   typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2085   typeArrayHandle sizeArray_h(THREAD, sa);
2086 
2087   // validate the thread id array
2088   validate_thread_id_array(ids_ah, CHECK);
2089 
2090   // sizeArray must be of the same length as the given array of thread IDs
2091   int num_threads = ids_ah->length();
2092   if (num_threads != sizeArray_h->length()) {
2093     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2094               "The length of the given long array does not match the length of "
2095               "the given array of thread IDs");
2096   }
2097 
2098   ThreadsListHandle tlh;
2099   for (int i = 0; i < num_threads; i++) {
2100     JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2101     if (java_thread != NULL) {
2102       sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2103     }
2104   }
2105 JVM_END
2106 
2107 // Returns the CPU time consumed by a given thread (in nanoseconds).
2108 // If thread_id == 0, CPU time for the current thread is returned.
2109 // If user_sys_cpu_time = true, user level and system CPU time of
2110 // a given thread is returned; otherwise, only user level CPU time
2111 // is returned.
2112 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2113   if (!os::is_thread_cpu_time_supported()) {
2114     return -1;
2115   }
2116 
2117   if (thread_id < 0) {
2118     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2119                "Invalid thread ID", -1);
2120   }
2121 
2122   JavaThread* java_thread = NULL;
2123   if (thread_id == 0) {
2124     // current thread
2125     return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2126   } else {
2127     ThreadsListHandle tlh;
2128     java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
2129     if (java_thread != NULL) {
2130       return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2131     }
2132   }
2133   return -1;
2134 JVM_END
2135 
2136 // Gets an array containing the CPU times consumed by a set of threads
2137 // (in nanoseconds).  Each element of the array is the CPU time for the
2138 // thread ID specified in the corresponding entry in the given array
2139 // of thread IDs; or -1 if the thread does not exist or has terminated.
2140 // If user_sys_cpu_time = true, the sum of user level and system CPU time
2141 // for the given thread is returned; otherwise, only user level CPU time
2142 // is returned.
2143 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2144                                               jlongArray timeArray,
2145                                               jboolean user_sys_cpu_time))
2146   // Check if threads is null
2147   if (ids == NULL || timeArray == NULL) {
2148     THROW(vmSymbols::java_lang_NullPointerException());
2149   }
2150 
2151   ResourceMark rm(THREAD);
2152   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2153   typeArrayHandle ids_ah(THREAD, ta);
2154 
2155   typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2156   typeArrayHandle timeArray_h(THREAD, tia);
2157 
2158   // validate the thread id array
2159   validate_thread_id_array(ids_ah, CHECK);
2160 
2161   // timeArray must be of the same length as the given array of thread IDs
2162   int num_threads = ids_ah->length();
2163   if (num_threads != timeArray_h->length()) {
2164     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2165               "The length of the given long array does not match the length of "
2166               "the given array of thread IDs");
2167   }
2168 
2169   ThreadsListHandle tlh;
2170   for (int i = 0; i < num_threads; i++) {
2171     JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2172     if (java_thread != NULL) {
2173       timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2174                                                       user_sys_cpu_time != 0));
2175     }
2176   }
2177 JVM_END
2178 
2179 
2180 
2181 #if INCLUDE_MANAGEMENT
2182 const struct jmmInterface_1_ jmm_interface = {
2183   NULL,
2184   NULL,
2185   jmm_GetVersion,
2186   jmm_GetOptionalSupport,
2187   jmm_GetThreadInfo,
2188   jmm_GetMemoryPools,
2189   jmm_GetMemoryManagers,
2190   jmm_GetMemoryPoolUsage,
2191   jmm_GetPeakMemoryPoolUsage,
2192   jmm_GetThreadAllocatedMemory,
2193   jmm_GetMemoryUsage,
2194   jmm_GetLongAttribute,
2195   jmm_GetBoolAttribute,
2196   jmm_SetBoolAttribute,
2197   jmm_GetLongAttributes,
2198   jmm_FindMonitorDeadlockedThreads,
2199   jmm_GetThreadCpuTime,
2200   jmm_GetVMGlobalNames,
2201   jmm_GetVMGlobals,
2202   jmm_GetInternalThreadTimes,
2203   jmm_ResetStatistic,
2204   jmm_SetPoolSensor,
2205   jmm_SetPoolThreshold,
2206   jmm_GetPoolCollectionUsage,
2207   jmm_GetGCExtAttributeInfo,
2208   jmm_GetLastGCStat,
2209   jmm_GetThreadCpuTimeWithKind,
2210   jmm_GetThreadCpuTimesWithKind,
2211   jmm_DumpHeap0,
2212   jmm_FindDeadlockedThreads,
2213   jmm_SetVMGlobal,
2214   NULL,
2215   jmm_DumpThreads,
2216   jmm_SetGCNotificationEnabled,
2217   jmm_GetDiagnosticCommands,
2218   jmm_GetDiagnosticCommandInfo,
2219   jmm_GetDiagnosticCommandArgumentsInfo,
2220   jmm_ExecuteDiagnosticCommand,
2221   jmm_SetDiagnosticFrameworkNotificationEnabled
2222 };
2223 #endif // INCLUDE_MANAGEMENT
2224 
2225 void* Management::get_jmm_interface(int version) {
2226 #if INCLUDE_MANAGEMENT
2227   if (version == JMM_VERSION) {
2228     return (void*) &jmm_interface;
2229   }
2230 #endif // INCLUDE_MANAGEMENT
2231   return NULL;
2232 }
--- EOF ---