1 /*
   2  * Copyright (c) 2003, 2011, 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/klassOop.hpp"
  33 #include "oops/objArrayKlass.hpp"
  34 #include "oops/oop.inline.hpp"
  35 #include "runtime/arguments.hpp"
  36 #include "runtime/handles.inline.hpp"
  37 #include "runtime/interfaceSupport.hpp"
  38 #include "runtime/javaCalls.hpp"
  39 #include "runtime/jniHandles.hpp"
  40 #include "runtime/os.hpp"
  41 #include "runtime/serviceThread.hpp"
  42 #include "services/classLoadingService.hpp"
  43 #include "services/diagnosticCommand.hpp"
  44 #include "services/diagnosticFramework.hpp"
  45 #include "services/heapDumper.hpp"
  46 #include "services/jmm.h"
  47 #include "services/lowMemoryDetector.hpp"
  48 #include "services/gcNotifier.hpp"
  49 #include "services/management.hpp"
  50 #include "services/memoryManager.hpp"
  51 #include "services/memoryPool.hpp"
  52 #include "services/memoryService.hpp"
  53 #include "services/runtimeService.hpp"
  54 #include "services/threadService.hpp"
  55 
  56 PerfVariable* Management::_begin_vm_creation_time = NULL;
  57 PerfVariable* Management::_end_vm_creation_time = NULL;
  58 PerfVariable* Management::_vm_init_done_time = NULL;
  59 
  60 klassOop Management::_sensor_klass = NULL;
  61 klassOop Management::_threadInfo_klass = NULL;
  62 klassOop Management::_memoryUsage_klass = NULL;
  63 klassOop Management::_memoryPoolMXBean_klass = NULL;
  64 klassOop Management::_memoryManagerMXBean_klass = NULL;
  65 klassOop Management::_garbageCollectorMXBean_klass = NULL;
  66 klassOop Management::_managementFactory_klass = NULL;
  67 klassOop Management::_garbageCollectorImpl_klass = NULL;
  68 klassOop Management::_gcInfo_klass = NULL;
  69 
  70 jmmOptionalSupport Management::_optional_support = {0};
  71 TimeStamp Management::_stamp;
  72 
  73 void management_init() {
  74   Management::init();
  75   ThreadService::init();
  76   RuntimeService::init();
  77   ClassLoadingService::init();
  78 }
  79 
  80 void Management::init() {
  81   EXCEPTION_MARK;
  82 
  83   // These counters are for java.lang.management API support.
  84   // They are created even if -XX:-UsePerfData is set and in
  85   // that case, they will be allocated on C heap.
  86 
  87   _begin_vm_creation_time =
  88             PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
  89                                              PerfData::U_None, CHECK);
  90 
  91   _end_vm_creation_time =
  92             PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
  93                                              PerfData::U_None, CHECK);
  94 
  95   _vm_init_done_time =
  96             PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
  97                                              PerfData::U_None, CHECK);
  98 
  99   // Initialize optional support
 100   _optional_support.isLowMemoryDetectionSupported = 1;
 101   _optional_support.isCompilationTimeMonitoringSupported = 1;
 102   _optional_support.isThreadContentionMonitoringSupported = 1;
 103 
 104   if (os::is_thread_cpu_time_supported()) {
 105     _optional_support.isCurrentThreadCpuTimeSupported = 1;
 106     _optional_support.isOtherThreadCpuTimeSupported = 1;
 107   } else {
 108     _optional_support.isCurrentThreadCpuTimeSupported = 0;
 109     _optional_support.isOtherThreadCpuTimeSupported = 0;
 110   }
 111 
 112   _optional_support.isBootClassPathSupported = 1;
 113   _optional_support.isObjectMonitorUsageSupported = 1;
 114 #ifndef SERVICES_KERNEL
 115   // This depends on the heap inspector
 116   _optional_support.isSynchronizerUsageSupported = 1;
 117 #endif // SERVICES_KERNEL
 118   _optional_support.isThreadAllocatedMemorySupported = 1;
 119 
 120   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<HelpDCmd>());
 121   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VersionDCmd>());
 122 }
 123 
 124 void Management::initialize(TRAPS) {
 125   // Start the service thread
 126   ServiceThread::initialize();
 127 
 128   if (ManagementServer) {
 129     ResourceMark rm(THREAD);
 130     HandleMark hm(THREAD);
 131 
 132     // Load and initialize the sun.management.Agent class
 133     // invoke startAgent method to start the management server
 134     Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
 135     klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::sun_management_Agent(),
 136                                                    loader,
 137                                                    Handle(),
 138                                                    true,
 139                                                    CHECK);
 140     instanceKlassHandle ik (THREAD, k);
 141 
 142     JavaValue result(T_VOID);
 143     JavaCalls::call_static(&result,
 144                            ik,
 145                            vmSymbols::startAgent_name(),
 146                            vmSymbols::void_method_signature(),
 147                            CHECK);
 148   }
 149 }
 150 
 151 void Management::get_optional_support(jmmOptionalSupport* support) {
 152   memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
 153 }
 154 
 155 klassOop Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
 156   klassOop k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
 157   instanceKlassHandle ik (THREAD, k);
 158   if (ik->should_be_initialized()) {
 159     ik->initialize(CHECK_NULL);
 160   }
 161   return ik();
 162 }
 163 
 164 void Management::record_vm_startup_time(jlong begin, jlong duration) {
 165   // if the performance counter is not initialized,
 166   // then vm initialization failed; simply return.
 167   if (_begin_vm_creation_time == NULL) return;
 168 
 169   _begin_vm_creation_time->set_value(begin);
 170   _end_vm_creation_time->set_value(begin + duration);
 171   PerfMemory::set_accessible(true);
 172 }
 173 
 174 jlong Management::timestamp() {
 175   TimeStamp t;
 176   t.update();
 177   return t.ticks() - _stamp.ticks();
 178 }
 179 
 180 void Management::oops_do(OopClosure* f) {
 181   MemoryService::oops_do(f);
 182   ThreadService::oops_do(f);
 183 
 184   f->do_oop((oop*) &_sensor_klass);
 185   f->do_oop((oop*) &_threadInfo_klass);
 186   f->do_oop((oop*) &_memoryUsage_klass);
 187   f->do_oop((oop*) &_memoryPoolMXBean_klass);
 188   f->do_oop((oop*) &_memoryManagerMXBean_klass);
 189   f->do_oop((oop*) &_garbageCollectorMXBean_klass);
 190   f->do_oop((oop*) &_managementFactory_klass);
 191   f->do_oop((oop*) &_garbageCollectorImpl_klass);
 192   f->do_oop((oop*) &_gcInfo_klass);
 193 }
 194 
 195 klassOop Management::java_lang_management_ThreadInfo_klass(TRAPS) {
 196   if (_threadInfo_klass == NULL) {
 197     _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
 198   }
 199   return _threadInfo_klass;
 200 }
 201 
 202 klassOop Management::java_lang_management_MemoryUsage_klass(TRAPS) {
 203   if (_memoryUsage_klass == NULL) {
 204     _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
 205   }
 206   return _memoryUsage_klass;
 207 }
 208 
 209 klassOop Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
 210   if (_memoryPoolMXBean_klass == NULL) {
 211     _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
 212   }
 213   return _memoryPoolMXBean_klass;
 214 }
 215 
 216 klassOop Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
 217   if (_memoryManagerMXBean_klass == NULL) {
 218     _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
 219   }
 220   return _memoryManagerMXBean_klass;
 221 }
 222 
 223 klassOop Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
 224   if (_garbageCollectorMXBean_klass == NULL) {
 225       _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
 226   }
 227   return _garbageCollectorMXBean_klass;
 228 }
 229 
 230 klassOop Management::sun_management_Sensor_klass(TRAPS) {
 231   if (_sensor_klass == NULL) {
 232     _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
 233   }
 234   return _sensor_klass;
 235 }
 236 
 237 klassOop Management::sun_management_ManagementFactory_klass(TRAPS) {
 238   if (_managementFactory_klass == NULL) {
 239     _managementFactory_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactory(), CHECK_NULL);
 240   }
 241   return _managementFactory_klass;
 242 }
 243 
 244 klassOop Management::sun_management_GarbageCollectorImpl_klass(TRAPS) {
 245   if (_garbageCollectorImpl_klass == NULL) {
 246     _garbageCollectorImpl_klass = load_and_initialize_klass(vmSymbols::sun_management_GarbageCollectorImpl(), CHECK_NULL);
 247   }
 248   return _garbageCollectorImpl_klass;
 249 }
 250 
 251 klassOop Management::com_sun_management_GcInfo_klass(TRAPS) {
 252   if (_gcInfo_klass == NULL) {
 253     _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
 254   }
 255   return _gcInfo_klass;
 256 }
 257 
 258 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
 259   Handle snapshot_thread(THREAD, snapshot->threadObj());
 260 
 261   jlong contended_time;
 262   jlong waited_time;
 263   if (ThreadService::is_thread_monitoring_contention()) {
 264     contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
 265     waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
 266   } else {
 267     // set them to -1 if thread contention monitoring is disabled.
 268     contended_time = max_julong;
 269     waited_time = max_julong;
 270   }
 271 
 272   int thread_status = snapshot->thread_status();
 273   assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
 274   if (snapshot->is_ext_suspended()) {
 275     thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
 276   }
 277   if (snapshot->is_in_native()) {
 278     thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
 279   }
 280 
 281   ThreadStackTrace* st = snapshot->get_stack_trace();
 282   Handle stacktrace_h;
 283   if (st != NULL) {
 284     stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
 285   } else {
 286     stacktrace_h = Handle();
 287   }
 288 
 289   args->push_oop(snapshot_thread);
 290   args->push_int(thread_status);
 291   args->push_oop(Handle(THREAD, snapshot->blocker_object()));
 292   args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
 293   args->push_long(snapshot->contended_enter_count());
 294   args->push_long(contended_time);
 295   args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
 296   args->push_long(waited_time);
 297   args->push_oop(stacktrace_h);
 298 }
 299 
 300 // Helper function to construct a ThreadInfo object
 301 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
 302   klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
 303   instanceKlassHandle ik (THREAD, k);
 304 
 305   JavaValue result(T_VOID);
 306   JavaCallArguments args(14);
 307 
 308   // First allocate a ThreadObj object and
 309   // push the receiver as the first argument
 310   Handle element = ik->allocate_instance_handle(CHECK_NULL);
 311   args.push_oop(element);
 312 
 313   // initialize the arguments for the ThreadInfo constructor
 314   initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
 315 
 316   // Call ThreadInfo constructor with no locked monitors and synchronizers
 317   JavaCalls::call_special(&result,
 318                           ik,
 319                           vmSymbols::object_initializer_name(),
 320                           vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
 321                           &args,
 322                           CHECK_NULL);
 323 
 324   return (instanceOop) element();
 325 }
 326 
 327 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
 328                                                     objArrayHandle monitors_array,
 329                                                     typeArrayHandle depths_array,
 330                                                     objArrayHandle synchronizers_array,
 331                                                     TRAPS) {
 332   klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
 333   instanceKlassHandle ik (THREAD, k);
 334 
 335   JavaValue result(T_VOID);
 336   JavaCallArguments args(17);
 337 
 338   // First allocate a ThreadObj object and
 339   // push the receiver as the first argument
 340   Handle element = ik->allocate_instance_handle(CHECK_NULL);
 341   args.push_oop(element);
 342 
 343   // initialize the arguments for the ThreadInfo constructor
 344   initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
 345 
 346   // push the locked monitors and synchronizers in the arguments
 347   args.push_oop(monitors_array);
 348   args.push_oop(depths_array);
 349   args.push_oop(synchronizers_array);
 350 
 351   // Call ThreadInfo constructor with locked monitors and synchronizers
 352   JavaCalls::call_special(&result,
 353                           ik,
 354                           vmSymbols::object_initializer_name(),
 355                           vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
 356                           &args,
 357                           CHECK_NULL);
 358 
 359   return (instanceOop) element();
 360 }
 361 
 362 // Helper functions
 363 static JavaThread* find_java_thread_from_id(jlong thread_id) {
 364   assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
 365 
 366   JavaThread* java_thread = NULL;
 367   // Sequential search for now.  Need to do better optimization later.
 368   for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
 369     oop tobj = thread->threadObj();
 370     if (!thread->is_exiting() &&
 371         tobj != NULL &&
 372         thread_id == java_lang_Thread::thread_id(tobj)) {
 373       java_thread = thread;
 374       break;
 375     }
 376   }
 377   return java_thread;
 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   klassOop 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 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
 416   int num_threads = ids_ah->length();
 417 
 418   // Validate input thread IDs
 419   int i = 0;
 420   for (i = 0; i < num_threads; i++) {
 421     jlong tid = ids_ah->long_at(i);
 422     if (tid <= 0) {
 423       // throw exception if invalid thread id.
 424       THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
 425                 "Invalid thread ID entry");
 426     }
 427   }
 428 }
 429 
 430 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
 431   // check if the element of infoArray is of type ThreadInfo class
 432   klassOop threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
 433   klassOop element_klass = objArrayKlass::cast(infoArray_h->klass())->element_klass();
 434   if (element_klass != threadinfo_klass) {
 435     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
 436               "infoArray element type is not ThreadInfo class");
 437   }
 438 }
 439 
 440 
 441 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
 442   if (obj == NULL) {
 443     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
 444   }
 445 
 446   oop mgr_obj = JNIHandles::resolve(obj);
 447   assert(mgr_obj->is_instance(), "Should be an instanceOop");
 448   instanceHandle mh(THREAD, (instanceOop) mgr_obj);
 449 
 450   return MemoryService::get_memory_manager(mh);
 451 }
 452 
 453 // Returns a version string and sets major and minor version if
 454 // the input parameters are non-null.
 455 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
 456   return JMM_VERSION;
 457 JVM_END
 458 
 459 // Gets the list of VM monitoring and management optional supports
 460 // Returns 0 if succeeded; otherwise returns non-zero.
 461 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
 462   if (support == NULL) {
 463     return -1;
 464   }
 465   Management::get_optional_support(support);
 466   return 0;
 467 JVM_END
 468 
 469 // Returns a java.lang.String object containing the input arguments to the VM.
 470 JVM_ENTRY(jobject, jmm_GetInputArguments(JNIEnv *env))
 471   ResourceMark rm(THREAD);
 472 
 473   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
 474     return NULL;
 475   }
 476 
 477   char** vm_flags = Arguments::jvm_flags_array();
 478   char** vm_args  = Arguments::jvm_args_array();
 479   int num_flags   = Arguments::num_jvm_flags();
 480   int num_args    = Arguments::num_jvm_args();
 481 
 482   size_t length = 1; // null terminator
 483   int i;
 484   for (i = 0; i < num_flags; i++) {
 485     length += strlen(vm_flags[i]);
 486   }
 487   for (i = 0; i < num_args; i++) {
 488     length += strlen(vm_args[i]);
 489   }
 490   // add a space between each argument
 491   length += num_flags + num_args - 1;
 492 
 493   // Return the list of input arguments passed to the VM
 494   // and preserve the order that the VM processes.
 495   char* args = NEW_RESOURCE_ARRAY(char, length);
 496   args[0] = '\0';
 497   // concatenate all jvm_flags
 498   if (num_flags > 0) {
 499     strcat(args, vm_flags[0]);
 500     for (i = 1; i < num_flags; i++) {
 501       strcat(args, " ");
 502       strcat(args, vm_flags[i]);
 503     }
 504   }
 505 
 506   if (num_args > 0 && num_flags > 0) {
 507     // append a space if args already contains one or more jvm_flags
 508     strcat(args, " ");
 509   }
 510 
 511   // concatenate all jvm_args
 512   if (num_args > 0) {
 513     strcat(args, vm_args[0]);
 514     for (i = 1; i < num_args; i++) {
 515       strcat(args, " ");
 516       strcat(args, vm_args[i]);
 517     }
 518   }
 519 
 520   Handle hargs = java_lang_String::create_from_platform_dependent_str(args, CHECK_NULL);
 521   return JNIHandles::make_local(env, hargs());
 522 JVM_END
 523 
 524 // Returns an array of java.lang.String object containing the input arguments to the VM.
 525 JVM_ENTRY(jobjectArray, jmm_GetInputArgumentArray(JNIEnv *env))
 526   ResourceMark rm(THREAD);
 527 
 528   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
 529     return NULL;
 530   }
 531 
 532   char** vm_flags = Arguments::jvm_flags_array();
 533   char** vm_args = Arguments::jvm_args_array();
 534   int num_flags = Arguments::num_jvm_flags();
 535   int num_args = Arguments::num_jvm_args();
 536 
 537   instanceKlassHandle ik (THREAD, SystemDictionary::String_klass());
 538   objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL);
 539   objArrayHandle result_h(THREAD, r);
 540 
 541   int index = 0;
 542   for (int j = 0; j < num_flags; j++, index++) {
 543     Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
 544     result_h->obj_at_put(index, h());
 545   }
 546   for (int i = 0; i < num_args; i++, index++) {
 547     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
 548     result_h->obj_at_put(index, h());
 549   }
 550   return (jobjectArray) JNIHandles::make_local(env, result_h());
 551 JVM_END
 552 
 553 // Returns an array of java/lang/management/MemoryPoolMXBean object
 554 // one for each memory pool if obj == null; otherwise returns
 555 // an array of memory pools for a given memory manager if
 556 // it is a valid memory manager.
 557 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
 558   ResourceMark rm(THREAD);
 559 
 560   int num_memory_pools;
 561   MemoryManager* mgr = NULL;
 562   if (obj == NULL) {
 563     num_memory_pools = MemoryService::num_memory_pools();
 564   } else {
 565     mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
 566     if (mgr == NULL) {
 567       return NULL;
 568     }
 569     num_memory_pools = mgr->num_memory_pools();
 570   }
 571 
 572   // Allocate the resulting MemoryPoolMXBean[] object
 573   klassOop k = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
 574   instanceKlassHandle ik (THREAD, k);
 575   objArrayOop r = oopFactory::new_objArray(ik(), num_memory_pools, CHECK_NULL);
 576   objArrayHandle poolArray(THREAD, r);
 577 
 578   if (mgr == NULL) {
 579     // Get all memory pools
 580     for (int i = 0; i < num_memory_pools; i++) {
 581       MemoryPool* pool = MemoryService::get_memory_pool(i);
 582       instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
 583       instanceHandle ph(THREAD, p);
 584       poolArray->obj_at_put(i, ph());
 585     }
 586   } else {
 587     // Get memory pools managed by a given memory manager
 588     for (int i = 0; i < num_memory_pools; i++) {
 589       MemoryPool* pool = mgr->get_memory_pool(i);
 590       instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
 591       instanceHandle ph(THREAD, p);
 592       poolArray->obj_at_put(i, ph());
 593     }
 594   }
 595   return (jobjectArray) JNIHandles::make_local(env, poolArray());
 596 JVM_END
 597 
 598 // Returns an array of java/lang/management/MemoryManagerMXBean object
 599 // one for each memory manager if obj == null; otherwise returns
 600 // an array of memory managers for a given memory pool if
 601 // it is a valid memory pool.
 602 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
 603   ResourceMark rm(THREAD);
 604 
 605   int num_mgrs;
 606   MemoryPool* pool = NULL;
 607   if (obj == NULL) {
 608     num_mgrs = MemoryService::num_memory_managers();
 609   } else {
 610     pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 611     if (pool == NULL) {
 612       return NULL;
 613     }
 614     num_mgrs = pool->num_memory_managers();
 615   }
 616 
 617   // Allocate the resulting MemoryManagerMXBean[] object
 618   klassOop k = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
 619   instanceKlassHandle ik (THREAD, k);
 620   objArrayOop r = oopFactory::new_objArray(ik(), num_mgrs, CHECK_NULL);
 621   objArrayHandle mgrArray(THREAD, r);
 622 
 623   if (pool == NULL) {
 624     // Get all memory managers
 625     for (int i = 0; i < num_mgrs; i++) {
 626       MemoryManager* mgr = MemoryService::get_memory_manager(i);
 627       instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
 628       instanceHandle ph(THREAD, p);
 629       mgrArray->obj_at_put(i, ph());
 630     }
 631   } else {
 632     // Get memory managers for a given memory pool
 633     for (int i = 0; i < num_mgrs; i++) {
 634       MemoryManager* mgr = pool->get_memory_manager(i);
 635       instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
 636       instanceHandle ph(THREAD, p);
 637       mgrArray->obj_at_put(i, ph());
 638     }
 639   }
 640   return (jobjectArray) JNIHandles::make_local(env, mgrArray());
 641 JVM_END
 642 
 643 
 644 // Returns a java/lang/management/MemoryUsage object containing the memory usage
 645 // of a given memory pool.
 646 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
 647   ResourceMark rm(THREAD);
 648 
 649   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 650   if (pool != NULL) {
 651     MemoryUsage usage = pool->get_memory_usage();
 652     Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 653     return JNIHandles::make_local(env, h());
 654   } else {
 655     return NULL;
 656   }
 657 JVM_END
 658 
 659 // Returns a java/lang/management/MemoryUsage object containing the memory usage
 660 // of a given memory pool.
 661 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
 662   ResourceMark rm(THREAD);
 663 
 664   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 665   if (pool != NULL) {
 666     MemoryUsage usage = pool->get_peak_memory_usage();
 667     Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 668     return JNIHandles::make_local(env, h());
 669   } else {
 670     return NULL;
 671   }
 672 JVM_END
 673 
 674 // Returns a java/lang/management/MemoryUsage object containing the memory usage
 675 // of a given memory pool after most recent GC.
 676 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
 677   ResourceMark rm(THREAD);
 678 
 679   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 680   if (pool != NULL && pool->is_collected_pool()) {
 681     MemoryUsage usage = pool->get_last_collection_usage();
 682     Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 683     return JNIHandles::make_local(env, h());
 684   } else {
 685     return NULL;
 686   }
 687 JVM_END
 688 
 689 // Sets the memory pool sensor for a threshold type
 690 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
 691   if (obj == NULL || sensorObj == NULL) {
 692     THROW(vmSymbols::java_lang_NullPointerException());
 693   }
 694 
 695   klassOop sensor_klass = Management::sun_management_Sensor_klass(CHECK);
 696   oop s = JNIHandles::resolve(sensorObj);
 697   assert(s->is_instance(), "Sensor should be an instanceOop");
 698   instanceHandle sensor_h(THREAD, (instanceOop) s);
 699   if (!sensor_h->is_a(sensor_klass)) {
 700     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
 701               "Sensor is not an instance of sun.management.Sensor class");
 702   }
 703 
 704   MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
 705   assert(mpool != NULL, "MemoryPool should exist");
 706 
 707   switch (type) {
 708     case JMM_USAGE_THRESHOLD_HIGH:
 709     case JMM_USAGE_THRESHOLD_LOW:
 710       // have only one sensor for threshold high and low
 711       mpool->set_usage_sensor_obj(sensor_h);
 712       break;
 713     case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
 714     case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
 715       // have only one sensor for threshold high and low
 716       mpool->set_gc_usage_sensor_obj(sensor_h);
 717       break;
 718     default:
 719       assert(false, "Unrecognized type");
 720   }
 721 
 722 JVM_END
 723 
 724 
 725 // Sets the threshold of a given memory pool.
 726 // Returns the previous threshold.
 727 //
 728 // Input parameters:
 729 //   pool      - the MemoryPoolMXBean object
 730 //   type      - threshold type
 731 //   threshold - the new threshold (must not be negative)
 732 //
 733 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
 734   if (threshold < 0) {
 735     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
 736                "Invalid threshold value",
 737                -1);
 738   }
 739 
 740   if ((size_t)threshold > max_uintx) {
 741     stringStream st;
 742     st.print("Invalid valid threshold value. Threshold value (" UINT64_FORMAT ") > max value of size_t (" SIZE_FORMAT ")", (size_t)threshold, max_uintx);
 743     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
 744   }
 745 
 746   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
 747   assert(pool != NULL, "MemoryPool should exist");
 748 
 749   jlong prev = 0;
 750   switch (type) {
 751     case JMM_USAGE_THRESHOLD_HIGH:
 752       if (!pool->usage_threshold()->is_high_threshold_supported()) {
 753         return -1;
 754       }
 755       prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
 756       break;
 757 
 758     case JMM_USAGE_THRESHOLD_LOW:
 759       if (!pool->usage_threshold()->is_low_threshold_supported()) {
 760         return -1;
 761       }
 762       prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
 763       break;
 764 
 765     case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
 766       if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
 767         return -1;
 768       }
 769       // return and the new threshold is effective for the next GC
 770       return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
 771 
 772     case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
 773       if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
 774         return -1;
 775       }
 776       // return and the new threshold is effective for the next GC
 777       return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
 778 
 779     default:
 780       assert(false, "Unrecognized type");
 781       return -1;
 782   }
 783 
 784   // When the threshold is changed, reevaluate if the low memory
 785   // detection is enabled.
 786   if (prev != threshold) {
 787     LowMemoryDetector::recompute_enabled_for_collected_pools();
 788     LowMemoryDetector::detect_low_memory(pool);
 789   }
 790   return prev;
 791 JVM_END
 792 
 793 // Gets an array containing the amount of memory allocated on the Java
 794 // heap for a set of threads (in bytes).  Each element of the array is
 795 // the amount of memory allocated for the thread ID specified in the
 796 // corresponding entry in the given array of thread IDs; or -1 if the
 797 // thread does not exist or has terminated.
 798 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
 799                                              jlongArray sizeArray))
 800   // Check if threads is null
 801   if (ids == NULL || sizeArray == NULL) {
 802     THROW(vmSymbols::java_lang_NullPointerException());
 803   }
 804 
 805   ResourceMark rm(THREAD);
 806   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
 807   typeArrayHandle ids_ah(THREAD, ta);
 808 
 809   typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
 810   typeArrayHandle sizeArray_h(THREAD, sa);
 811 
 812   // validate the thread id array
 813   validate_thread_id_array(ids_ah, CHECK);
 814 
 815   // sizeArray must be of the same length as the given array of thread IDs
 816   int num_threads = ids_ah->length();
 817   if (num_threads != sizeArray_h->length()) {
 818     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
 819               "The length of the given long array does not match the length of "
 820               "the given array of thread IDs");
 821   }
 822 
 823   MutexLockerEx ml(Threads_lock);
 824   for (int i = 0; i < num_threads; i++) {
 825     JavaThread* java_thread = find_java_thread_from_id(ids_ah->long_at(i));
 826     if (java_thread != NULL) {
 827       sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
 828     }
 829   }
 830 JVM_END
 831 
 832 // Returns a java/lang/management/MemoryUsage object representing
 833 // the memory usage for the heap or non-heap memory.
 834 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
 835   ResourceMark rm(THREAD);
 836 
 837   // Calculate the memory usage
 838   size_t total_init = 0;
 839   size_t total_used = 0;
 840   size_t total_committed = 0;
 841   size_t total_max = 0;
 842   bool   has_undefined_init_size = false;
 843   bool   has_undefined_max_size = false;
 844 
 845   for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
 846     MemoryPool* pool = MemoryService::get_memory_pool(i);
 847     if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
 848       MemoryUsage u = pool->get_memory_usage();
 849       total_used += u.used();
 850       total_committed += u.committed();
 851 
 852       // if any one of the memory pool has undefined init_size or max_size,
 853       // set it to -1
 854       if (u.init_size() == (size_t)-1) {
 855         has_undefined_init_size = true;
 856       }
 857       if (!has_undefined_init_size) {
 858         total_init += u.init_size();
 859       }
 860 
 861       if (u.max_size() == (size_t)-1) {
 862         has_undefined_max_size = true;
 863       }
 864       if (!has_undefined_max_size) {
 865         total_max += u.max_size();
 866       }
 867     }
 868   }
 869 
 870   // In our current implementation, we make sure that all non-heap
 871   // pools have defined init and max sizes. Heap pools do not matter,
 872   // as we never use total_init and total_max for them.
 873   assert(heap || !has_undefined_init_size, "Undefined init size");
 874   assert(heap || !has_undefined_max_size,  "Undefined max size");
 875 
 876   MemoryUsage usage((heap ? InitialHeapSize : total_init),
 877                     total_used,
 878                     total_committed,
 879                     (heap ? Universe::heap()->max_capacity() : total_max));
 880 
 881   Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 882   return JNIHandles::make_local(env, obj());
 883 JVM_END
 884 
 885 // Returns the boolean value of a given attribute.
 886 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
 887   switch (att) {
 888   case JMM_VERBOSE_GC:
 889     return MemoryService::get_verbose();
 890   case JMM_VERBOSE_CLASS:
 891     return ClassLoadingService::get_verbose();
 892   case JMM_THREAD_CONTENTION_MONITORING:
 893     return ThreadService::is_thread_monitoring_contention();
 894   case JMM_THREAD_CPU_TIME:
 895     return ThreadService::is_thread_cpu_time_enabled();
 896   case JMM_THREAD_ALLOCATED_MEMORY:
 897     return ThreadService::is_thread_allocated_memory_enabled();
 898   default:
 899     assert(0, "Unrecognized attribute");
 900     return false;
 901   }
 902 JVM_END
 903 
 904 // Sets the given boolean attribute and returns the previous value.
 905 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
 906   switch (att) {
 907   case JMM_VERBOSE_GC:
 908     return MemoryService::set_verbose(flag != 0);
 909   case JMM_VERBOSE_CLASS:
 910     return ClassLoadingService::set_verbose(flag != 0);
 911   case JMM_THREAD_CONTENTION_MONITORING:
 912     return ThreadService::set_thread_monitoring_contention(flag != 0);
 913   case JMM_THREAD_CPU_TIME:
 914     return ThreadService::set_thread_cpu_time_enabled(flag != 0);
 915   case JMM_THREAD_ALLOCATED_MEMORY:
 916     return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
 917   default:
 918     assert(0, "Unrecognized attribute");
 919     return false;
 920   }
 921 JVM_END
 922 
 923 
 924 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
 925   switch (att) {
 926   case JMM_GC_TIME_MS:
 927     return mgr->gc_time_ms();
 928 
 929   case JMM_GC_COUNT:
 930     return mgr->gc_count();
 931 
 932   case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
 933     // current implementation only has 1 ext attribute
 934     return 1;
 935 
 936   default:
 937     assert(0, "Unrecognized GC attribute");
 938     return -1;
 939   }
 940 }
 941 
 942 class VmThreadCountClosure: public ThreadClosure {
 943  private:
 944   int _count;
 945  public:
 946   VmThreadCountClosure() : _count(0) {};
 947   void do_thread(Thread* thread);
 948   int count() { return _count; }
 949 };
 950 
 951 void VmThreadCountClosure::do_thread(Thread* thread) {
 952   // exclude externally visible JavaThreads
 953   if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
 954     return;
 955   }
 956 
 957   _count++;
 958 }
 959 
 960 static jint get_vm_thread_count() {
 961   VmThreadCountClosure vmtcc;
 962   {
 963     MutexLockerEx ml(Threads_lock);
 964     Threads::threads_do(&vmtcc);
 965   }
 966 
 967   return vmtcc.count();
 968 }
 969 
 970 static jint get_num_flags() {
 971   // last flag entry is always NULL, so subtract 1
 972   int nFlags = (int) Flag::numFlags - 1;
 973   int count = 0;
 974   for (int i = 0; i < nFlags; i++) {
 975     Flag* flag = &Flag::flags[i];
 976     // Exclude the locked (diagnostic, experimental) flags
 977     if (flag->is_unlocked() || flag->is_unlocker()) {
 978       count++;
 979     }
 980   }
 981   return count;
 982 }
 983 
 984 static jlong get_long_attribute(jmmLongAttribute att) {
 985   switch (att) {
 986   case JMM_CLASS_LOADED_COUNT:
 987     return ClassLoadingService::loaded_class_count();
 988 
 989   case JMM_CLASS_UNLOADED_COUNT:
 990     return ClassLoadingService::unloaded_class_count();
 991 
 992   case JMM_THREAD_TOTAL_COUNT:
 993     return ThreadService::get_total_thread_count();
 994 
 995   case JMM_THREAD_LIVE_COUNT:
 996     return ThreadService::get_live_thread_count();
 997 
 998   case JMM_THREAD_PEAK_COUNT:
 999     return ThreadService::get_peak_thread_count();
1000 
1001   case JMM_THREAD_DAEMON_COUNT:
1002     return ThreadService::get_daemon_thread_count();
1003 
1004   case JMM_JVM_INIT_DONE_TIME_MS:
1005     return Management::vm_init_done_time();
1006 
1007   case JMM_COMPILE_TOTAL_TIME_MS:
1008     return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
1009 
1010   case JMM_OS_PROCESS_ID:
1011     return os::current_process_id();
1012 
1013   // Hotspot-specific counters
1014   case JMM_CLASS_LOADED_BYTES:
1015     return ClassLoadingService::loaded_class_bytes();
1016 
1017   case JMM_CLASS_UNLOADED_BYTES:
1018     return ClassLoadingService::unloaded_class_bytes();
1019 
1020   case JMM_SHARED_CLASS_LOADED_COUNT:
1021     return ClassLoadingService::loaded_shared_class_count();
1022 
1023   case JMM_SHARED_CLASS_UNLOADED_COUNT:
1024     return ClassLoadingService::unloaded_shared_class_count();
1025 
1026 
1027   case JMM_SHARED_CLASS_LOADED_BYTES:
1028     return ClassLoadingService::loaded_shared_class_bytes();
1029 
1030   case JMM_SHARED_CLASS_UNLOADED_BYTES:
1031     return ClassLoadingService::unloaded_shared_class_bytes();
1032 
1033   case JMM_TOTAL_CLASSLOAD_TIME_MS:
1034     return ClassLoader::classloader_time_ms();
1035 
1036   case JMM_VM_GLOBAL_COUNT:
1037     return get_num_flags();
1038 
1039   case JMM_SAFEPOINT_COUNT:
1040     return RuntimeService::safepoint_count();
1041 
1042   case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
1043     return RuntimeService::safepoint_sync_time_ms();
1044 
1045   case JMM_TOTAL_STOPPED_TIME_MS:
1046     return RuntimeService::safepoint_time_ms();
1047 
1048   case JMM_TOTAL_APP_TIME_MS:
1049     return RuntimeService::application_time_ms();
1050 
1051   case JMM_VM_THREAD_COUNT:
1052     return get_vm_thread_count();
1053 
1054   case JMM_CLASS_INIT_TOTAL_COUNT:
1055     return ClassLoader::class_init_count();
1056 
1057   case JMM_CLASS_INIT_TOTAL_TIME_MS:
1058     return ClassLoader::class_init_time_ms();
1059 
1060   case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
1061     return ClassLoader::class_verify_time_ms();
1062 
1063   case JMM_METHOD_DATA_SIZE_BYTES:
1064     return ClassLoadingService::class_method_data_size();
1065 
1066   case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
1067     return os::physical_memory();
1068 
1069   default:
1070     return -1;
1071   }
1072 }
1073 
1074 
1075 // Returns the long value of a given attribute.
1076 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
1077   if (obj == NULL) {
1078     return get_long_attribute(att);
1079   } else {
1080     GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
1081     if (mgr != NULL) {
1082       return get_gc_attribute(mgr, att);
1083     }
1084   }
1085   return -1;
1086 JVM_END
1087 
1088 // Gets the value of all attributes specified in the given array
1089 // and sets the value in the result array.
1090 // Returns the number of attributes found.
1091 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
1092                                       jobject obj,
1093                                       jmmLongAttribute* atts,
1094                                       jint count,
1095                                       jlong* result))
1096 
1097   int num_atts = 0;
1098   if (obj == NULL) {
1099     for (int i = 0; i < count; i++) {
1100       result[i] = get_long_attribute(atts[i]);
1101       if (result[i] != -1) {
1102         num_atts++;
1103       }
1104     }
1105   } else {
1106     GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
1107     for (int i = 0; i < count; i++) {
1108       result[i] = get_gc_attribute(mgr, atts[i]);
1109       if (result[i] != -1) {
1110         num_atts++;
1111       }
1112     }
1113   }
1114   return num_atts;
1115 JVM_END
1116 
1117 // Helper function to do thread dump for a specific list of threads
1118 static void do_thread_dump(ThreadDumpResult* dump_result,
1119                            typeArrayHandle ids_ah,  // array of thread ID (long[])
1120                            int num_threads,
1121                            int max_depth,
1122                            bool with_locked_monitors,
1123                            bool with_locked_synchronizers,
1124                            TRAPS) {
1125 
1126   // First get an array of threadObj handles.
1127   // A JavaThread may terminate before we get the stack trace.
1128   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1129   {
1130     MutexLockerEx ml(Threads_lock);
1131     for (int i = 0; i < num_threads; i++) {
1132       jlong tid = ids_ah->long_at(i);
1133       JavaThread* jt = find_java_thread_from_id(tid);
1134       oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1135       instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1136       thread_handle_array->append(threadObj_h);
1137     }
1138   }
1139 
1140   // Obtain thread dumps and thread snapshot information
1141   VM_ThreadDump op(dump_result,
1142                    thread_handle_array,
1143                    num_threads,
1144                    max_depth, /* stack depth */
1145                    with_locked_monitors,
1146                    with_locked_synchronizers);
1147   VMThread::execute(&op);
1148 }
1149 
1150 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1151 // for the thread ID specified in the corresponding entry in
1152 // the given array of thread IDs; or NULL if the thread does not exist
1153 // or has terminated.
1154 //
1155 // Input parameters:
1156 //   ids       - array of thread IDs
1157 //   maxDepth  - the maximum depth of stack traces to be dumped:
1158 //               maxDepth == -1 requests to dump entire stack trace.
1159 //               maxDepth == 0  requests no stack trace.
1160 //   infoArray - array of ThreadInfo objects
1161 //
1162 // QQQ - Why does this method return a value instead of void?
1163 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1164   // Check if threads is null
1165   if (ids == NULL || infoArray == NULL) {
1166     THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1167   }
1168 
1169   if (maxDepth < -1) {
1170     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1171                "Invalid maxDepth", -1);
1172   }
1173 
1174   ResourceMark rm(THREAD);
1175   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1176   typeArrayHandle ids_ah(THREAD, ta);
1177 
1178   oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1179   objArrayOop oa = objArrayOop(infoArray_obj);
1180   objArrayHandle infoArray_h(THREAD, oa);
1181 
1182   // validate the thread id array
1183   validate_thread_id_array(ids_ah, CHECK_0);
1184 
1185   // validate the ThreadInfo[] parameters
1186   validate_thread_info_array(infoArray_h, CHECK_0);
1187 
1188   // infoArray must be of the same length as the given array of thread IDs
1189   int num_threads = ids_ah->length();
1190   if (num_threads != infoArray_h->length()) {
1191     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1192                "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1193   }
1194 
1195   if (JDK_Version::is_gte_jdk16x_version()) {
1196     // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1197     java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1198   }
1199 
1200   // Must use ThreadDumpResult to store the ThreadSnapshot.
1201   // GC may occur after the thread snapshots are taken but before
1202   // this function returns. The threadObj and other oops kept
1203   // in the ThreadSnapshot are marked and adjusted during GC.
1204   ThreadDumpResult dump_result(num_threads);
1205 
1206   if (maxDepth == 0) {
1207     // no stack trace dumped - do not need to stop the world
1208     {
1209       MutexLockerEx ml(Threads_lock);
1210       for (int i = 0; i < num_threads; i++) {
1211         jlong tid = ids_ah->long_at(i);
1212         JavaThread* jt = find_java_thread_from_id(tid);
1213         ThreadSnapshot* ts;
1214         if (jt == NULL) {
1215           // if the thread does not exist or now it is terminated,
1216           // create dummy snapshot
1217           ts = new ThreadSnapshot();
1218         } else {
1219           ts = new ThreadSnapshot(jt);
1220         }
1221         dump_result.add_thread_snapshot(ts);
1222       }
1223     }
1224   } else {
1225     // obtain thread dump with the specific list of threads with stack trace
1226     do_thread_dump(&dump_result,
1227                    ids_ah,
1228                    num_threads,
1229                    maxDepth,
1230                    false, /* no locked monitor */
1231                    false, /* no locked synchronizers */
1232                    CHECK_0);
1233   }
1234 
1235   int num_snapshots = dump_result.num_snapshots();
1236   assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1237   int index = 0;
1238   for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1239     // For each thread, create an java/lang/management/ThreadInfo object
1240     // and fill with the thread information
1241 
1242     if (ts->threadObj() == NULL) {
1243      // if the thread does not exist or now it is terminated, set threadinfo to NULL
1244       infoArray_h->obj_at_put(index, NULL);
1245       continue;
1246     }
1247 
1248     // Create java.lang.management.ThreadInfo object
1249     instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1250     infoArray_h->obj_at_put(index, info_obj);
1251   }
1252   return 0;
1253 JVM_END
1254 
1255 // Dump thread info for the specified threads.
1256 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1257 // for the thread ID specified in the corresponding entry in
1258 // the given array of thread IDs; or NULL if the thread does not exist
1259 // or has terminated.
1260 //
1261 // Input parameter:
1262 //    ids - array of thread IDs; NULL indicates all live threads
1263 //    locked_monitors - if true, dump locked object monitors
1264 //    locked_synchronizers - if true, dump locked JSR-166 synchronizers
1265 //
1266 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers))
1267   ResourceMark rm(THREAD);
1268 
1269   if (JDK_Version::is_gte_jdk16x_version()) {
1270     // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1271     java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1272   }
1273 
1274   typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1275   int num_threads = (ta != NULL ? ta->length() : 0);
1276   typeArrayHandle ids_ah(THREAD, ta);
1277 
1278   ThreadDumpResult dump_result(num_threads);  // can safepoint
1279 
1280   if (ids_ah() != NULL) {
1281 
1282     // validate the thread id array
1283     validate_thread_id_array(ids_ah, CHECK_NULL);
1284 
1285     // obtain thread dump of a specific list of threads
1286     do_thread_dump(&dump_result,
1287                    ids_ah,
1288                    num_threads,
1289                    -1, /* entire stack */
1290                    (locked_monitors ? true : false),      /* with locked monitors */
1291                    (locked_synchronizers ? true : false), /* with locked synchronizers */
1292                    CHECK_NULL);
1293   } else {
1294     // obtain thread dump of all threads
1295     VM_ThreadDump op(&dump_result,
1296                      -1, /* entire stack */
1297                      (locked_monitors ? true : false),     /* with locked monitors */
1298                      (locked_synchronizers ? true : false) /* with locked synchronizers */);
1299     VMThread::execute(&op);
1300   }
1301 
1302   int num_snapshots = dump_result.num_snapshots();
1303 
1304   // create the result ThreadInfo[] object
1305   klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1306   instanceKlassHandle ik (THREAD, k);
1307   objArrayOop r = oopFactory::new_objArray(ik(), num_snapshots, CHECK_NULL);
1308   objArrayHandle result_h(THREAD, r);
1309 
1310   int index = 0;
1311   for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1312     if (ts->threadObj() == NULL) {
1313      // if the thread does not exist or now it is terminated, set threadinfo to NULL
1314       result_h->obj_at_put(index, NULL);
1315       continue;
1316     }
1317 
1318     ThreadStackTrace* stacktrace = ts->get_stack_trace();
1319     assert(stacktrace != NULL, "Must have a stack trace dumped");
1320 
1321     // Create Object[] filled with locked monitors
1322     // Create int[] filled with the stack depth where a monitor was locked
1323     int num_frames = stacktrace->get_stack_depth();
1324     int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1325 
1326     // Count the total number of locked monitors
1327     for (int i = 0; i < num_frames; i++) {
1328       StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1329       num_locked_monitors += frame->num_locked_monitors();
1330     }
1331 
1332     objArrayHandle monitors_array;
1333     typeArrayHandle depths_array;
1334     objArrayHandle synchronizers_array;
1335 
1336     if (locked_monitors) {
1337       // Constructs Object[] and int[] to contain the object monitor and the stack depth
1338       // where the thread locked it
1339       objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1340       objArrayHandle mh(THREAD, array);
1341       monitors_array = mh;
1342 
1343       typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1344       typeArrayHandle dh(THREAD, tarray);
1345       depths_array = dh;
1346 
1347       int count = 0;
1348       int j = 0;
1349       for (int depth = 0; depth < num_frames; depth++) {
1350         StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1351         int len = frame->num_locked_monitors();
1352         GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1353         for (j = 0; j < len; j++) {
1354           oop monitor = locked_monitors->at(j);
1355           assert(monitor != NULL && monitor->is_instance(), "must be a Java object");
1356           monitors_array->obj_at_put(count, monitor);
1357           depths_array->int_at_put(count, depth);
1358           count++;
1359         }
1360       }
1361 
1362       GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1363       for (j = 0; j < jni_locked_monitors->length(); j++) {
1364         oop object = jni_locked_monitors->at(j);
1365         assert(object != NULL && object->is_instance(), "must be a Java object");
1366         monitors_array->obj_at_put(count, object);
1367         // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1368         depths_array->int_at_put(count, -1);
1369         count++;
1370       }
1371       assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1372     }
1373 
1374     if (locked_synchronizers) {
1375       // Create Object[] filled with locked JSR-166 synchronizers
1376       assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1377       ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1378       GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1379       int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1380 
1381       objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1382       objArrayHandle sh(THREAD, array);
1383       synchronizers_array = sh;
1384 
1385       for (int k = 0; k < num_locked_synchronizers; k++) {
1386         synchronizers_array->obj_at_put(k, locks->at(k));
1387       }
1388     }
1389 
1390     // Create java.lang.management.ThreadInfo object
1391     instanceOop info_obj = Management::create_thread_info_instance(ts,
1392                                                                    monitors_array,
1393                                                                    depths_array,
1394                                                                    synchronizers_array,
1395                                                                    CHECK_NULL);
1396     result_h->obj_at_put(index, info_obj);
1397   }
1398 
1399   return (jobjectArray) JNIHandles::make_local(env, result_h());
1400 JVM_END
1401 
1402 // Returns an array of Class objects.
1403 JVM_ENTRY(jobjectArray, jmm_GetLoadedClasses(JNIEnv *env))
1404   ResourceMark rm(THREAD);
1405 
1406   LoadedClassesEnumerator lce(THREAD);  // Pass current Thread as parameter
1407 
1408   int num_classes = lce.num_loaded_classes();
1409   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), num_classes, CHECK_0);
1410   objArrayHandle classes_ah(THREAD, r);
1411 
1412   for (int i = 0; i < num_classes; i++) {
1413     KlassHandle kh = lce.get_klass(i);
1414     oop mirror = Klass::cast(kh())->java_mirror();
1415     classes_ah->obj_at_put(i, mirror);
1416   }
1417 
1418   return (jobjectArray) JNIHandles::make_local(env, classes_ah());
1419 JVM_END
1420 
1421 // Reset statistic.  Return true if the requested statistic is reset.
1422 // Otherwise, return false.
1423 //
1424 // Input parameters:
1425 //  obj  - specify which instance the statistic associated with to be reset
1426 //         For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1427 //         For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1428 //  type - the type of statistic to be reset
1429 //
1430 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1431   ResourceMark rm(THREAD);
1432 
1433   switch (type) {
1434     case JMM_STAT_PEAK_THREAD_COUNT:
1435       ThreadService::reset_peak_thread_count();
1436       return true;
1437 
1438     case JMM_STAT_THREAD_CONTENTION_COUNT:
1439     case JMM_STAT_THREAD_CONTENTION_TIME: {
1440       jlong tid = obj.j;
1441       if (tid < 0) {
1442         THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1443       }
1444 
1445       // Look for the JavaThread of this given tid
1446       MutexLockerEx ml(Threads_lock);
1447       if (tid == 0) {
1448         // reset contention statistics for all threads if tid == 0
1449         for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) {
1450           if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1451             ThreadService::reset_contention_count_stat(java_thread);
1452           } else {
1453             ThreadService::reset_contention_time_stat(java_thread);
1454           }
1455         }
1456       } else {
1457         // reset contention statistics for a given thread
1458         JavaThread* java_thread = find_java_thread_from_id(tid);
1459         if (java_thread == NULL) {
1460           return false;
1461         }
1462 
1463         if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1464           ThreadService::reset_contention_count_stat(java_thread);
1465         } else {
1466           ThreadService::reset_contention_time_stat(java_thread);
1467         }
1468       }
1469       return true;
1470       break;
1471     }
1472     case JMM_STAT_PEAK_POOL_USAGE: {
1473       jobject o = obj.l;
1474       if (o == NULL) {
1475         THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1476       }
1477 
1478       oop pool_obj = JNIHandles::resolve(o);
1479       assert(pool_obj->is_instance(), "Should be an instanceOop");
1480       instanceHandle ph(THREAD, (instanceOop) pool_obj);
1481 
1482       MemoryPool* pool = MemoryService::get_memory_pool(ph);
1483       if (pool != NULL) {
1484         pool->reset_peak_memory_usage();
1485         return true;
1486       }
1487       break;
1488     }
1489     case JMM_STAT_GC_STAT: {
1490       jobject o = obj.l;
1491       if (o == NULL) {
1492         THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1493       }
1494 
1495       GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1496       if (mgr != NULL) {
1497         mgr->reset_gc_stat();
1498         return true;
1499       }
1500       break;
1501     }
1502     default:
1503       assert(0, "Unknown Statistic Type");
1504   }
1505   return false;
1506 JVM_END
1507 
1508 // Returns the fast estimate of CPU time consumed by
1509 // a given thread (in nanoseconds).
1510 // If thread_id == 0, return CPU time for the current thread.
1511 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1512   if (!os::is_thread_cpu_time_supported()) {
1513     return -1;
1514   }
1515 
1516   if (thread_id < 0) {
1517     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1518                "Invalid thread ID", -1);
1519   }
1520 
1521   JavaThread* java_thread = NULL;
1522   if (thread_id == 0) {
1523     // current thread
1524     return os::current_thread_cpu_time();
1525   } else {
1526     MutexLockerEx ml(Threads_lock);
1527     java_thread = find_java_thread_from_id(thread_id);
1528     if (java_thread != NULL) {
1529       return os::thread_cpu_time((Thread*) java_thread);
1530     }
1531   }
1532   return -1;
1533 JVM_END
1534 
1535 // Returns the CPU time consumed by a given thread (in nanoseconds).
1536 // If thread_id == 0, CPU time for the current thread is returned.
1537 // If user_sys_cpu_time = true, user level and system CPU time of
1538 // a given thread is returned; otherwise, only user level CPU time
1539 // is returned.
1540 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
1541   if (!os::is_thread_cpu_time_supported()) {
1542     return -1;
1543   }
1544 
1545   if (thread_id < 0) {
1546     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1547                "Invalid thread ID", -1);
1548   }
1549 
1550   JavaThread* java_thread = NULL;
1551   if (thread_id == 0) {
1552     // current thread
1553     return os::current_thread_cpu_time(user_sys_cpu_time != 0);
1554   } else {
1555     MutexLockerEx ml(Threads_lock);
1556     java_thread = find_java_thread_from_id(thread_id);
1557     if (java_thread != NULL) {
1558       return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
1559     }
1560   }
1561   return -1;
1562 JVM_END
1563 
1564 // Gets an array containing the CPU times consumed by a set of threads
1565 // (in nanoseconds).  Each element of the array is the CPU time for the
1566 // thread ID specified in the corresponding entry in the given array
1567 // of thread IDs; or -1 if the thread does not exist or has terminated.
1568 // If user_sys_cpu_time = true, the sum of user level and system CPU time
1569 // for the given thread is returned; otherwise, only user level CPU time
1570 // is returned.
1571 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
1572                                               jlongArray timeArray,
1573                                               jboolean user_sys_cpu_time))
1574   // Check if threads is null
1575   if (ids == NULL || timeArray == NULL) {
1576     THROW(vmSymbols::java_lang_NullPointerException());
1577   }
1578 
1579   ResourceMark rm(THREAD);
1580   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1581   typeArrayHandle ids_ah(THREAD, ta);
1582 
1583   typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
1584   typeArrayHandle timeArray_h(THREAD, tia);
1585 
1586   // validate the thread id array
1587   validate_thread_id_array(ids_ah, CHECK);
1588 
1589   // timeArray must be of the same length as the given array of thread IDs
1590   int num_threads = ids_ah->length();
1591   if (num_threads != timeArray_h->length()) {
1592     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1593               "The length of the given long array does not match the length of "
1594               "the given array of thread IDs");
1595   }
1596 
1597   MutexLockerEx ml(Threads_lock);
1598   for (int i = 0; i < num_threads; i++) {
1599     JavaThread* java_thread = find_java_thread_from_id(ids_ah->long_at(i));
1600     if (java_thread != NULL) {
1601       timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
1602                                                       user_sys_cpu_time != 0));
1603     }
1604   }
1605 JVM_END
1606 
1607 // Returns a String array of all VM global flag names
1608 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1609   // last flag entry is always NULL, so subtract 1
1610   int nFlags = (int) Flag::numFlags - 1;
1611   // allocate a temp array
1612   objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1613                                            nFlags, CHECK_0);
1614   objArrayHandle flags_ah(THREAD, r);
1615   int num_entries = 0;
1616   for (int i = 0; i < nFlags; i++) {
1617     Flag* flag = &Flag::flags[i];
1618     // Exclude the locked (experimental, diagnostic) flags
1619     if (flag->is_unlocked() || flag->is_unlocker()) {
1620       Handle s = java_lang_String::create_from_str(flag->name, CHECK_0);
1621       flags_ah->obj_at_put(num_entries, s());
1622       num_entries++;
1623     }
1624   }
1625 
1626   if (num_entries < nFlags) {
1627     // Return array of right length
1628     objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1629     for(int i = 0; i < num_entries; i++) {
1630       res->obj_at_put(i, flags_ah->obj_at(i));
1631     }
1632     return (jobjectArray)JNIHandles::make_local(env, res);
1633   }
1634 
1635   return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1636 JVM_END
1637 
1638 // Utility function used by jmm_GetVMGlobals.  Returns false if flag type
1639 // can't be determined, true otherwise.  If false is returned, then *global
1640 // will be incomplete and invalid.
1641 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
1642   Handle flag_name;
1643   if (name() == NULL) {
1644     flag_name = java_lang_String::create_from_str(flag->name, CHECK_false);
1645   } else {
1646     flag_name = name;
1647   }
1648   global->name = (jstring)JNIHandles::make_local(env, flag_name());
1649 
1650   if (flag->is_bool()) {
1651     global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1652     global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1653   } else if (flag->is_intx()) {
1654     global->value.j = (jlong)flag->get_intx();
1655     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1656   } else if (flag->is_uintx()) {
1657     global->value.j = (jlong)flag->get_uintx();
1658     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1659   } else if (flag->is_uint64_t()) {
1660     global->value.j = (jlong)flag->get_uint64_t();
1661     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1662   } else if (flag->is_ccstr()) {
1663     Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1664     global->value.l = (jobject)JNIHandles::make_local(env, str());
1665     global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1666   } else {
1667     global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1668     return false;
1669   }
1670 
1671   global->writeable = flag->is_writeable();
1672   global->external = flag->is_external();
1673   switch (flag->origin) {
1674     case DEFAULT:
1675       global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1676       break;
1677     case COMMAND_LINE:
1678       global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1679       break;
1680     case ENVIRON_VAR:
1681       global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1682       break;
1683     case CONFIG_FILE:
1684       global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1685       break;
1686     case MANAGEMENT:
1687       global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1688       break;
1689     case ERGONOMIC:
1690       global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1691       break;
1692     default:
1693       global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1694   }
1695 
1696   return true;
1697 }
1698 
1699 // Fill globals array of count length with jmmVMGlobal entries
1700 // specified by names. If names == NULL, fill globals array
1701 // with all Flags. Return value is number of entries
1702 // created in globals.
1703 // If a Flag with a given name in an array element does not
1704 // exist, globals[i].name will be set to NULL.
1705 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1706                                  jobjectArray names,
1707                                  jmmVMGlobal *globals,
1708                                  jint count))
1709 
1710 
1711   if (globals == NULL) {
1712     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1713   }
1714 
1715   ResourceMark rm(THREAD);
1716 
1717   if (names != NULL) {
1718     // return the requested globals
1719     objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1720     objArrayHandle names_ah(THREAD, ta);
1721     // Make sure we have a String array
1722     klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass();
1723     if (element_klass != SystemDictionary::String_klass()) {
1724       THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1725                  "Array element type is not String class", 0);
1726     }
1727 
1728     int names_length = names_ah->length();
1729     int num_entries = 0;
1730     for (int i = 0; i < names_length && i < count; i++) {
1731       oop s = names_ah->obj_at(i);
1732       if (s == NULL) {
1733         THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1734       }
1735 
1736       Handle sh(THREAD, s);
1737       char* str = java_lang_String::as_utf8_string(s);
1738       Flag* flag = Flag::find_flag(str, strlen(str));
1739       if (flag != NULL &&
1740           add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1741         num_entries++;
1742       } else {
1743         globals[i].name = NULL;
1744       }
1745     }
1746     return num_entries;
1747   } else {
1748     // return all globals if names == NULL
1749 
1750     // last flag entry is always NULL, so subtract 1
1751     int nFlags = (int) Flag::numFlags - 1;
1752     Handle null_h;
1753     int num_entries = 0;
1754     for (int i = 0; i < nFlags && num_entries < count;  i++) {
1755       Flag* flag = &Flag::flags[i];
1756       // Exclude the locked (diagnostic, experimental) flags
1757       if ((flag->is_unlocked() || flag->is_unlocker()) &&
1758           add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1759         num_entries++;
1760       }
1761     }
1762     return num_entries;
1763   }
1764 JVM_END
1765 
1766 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1767   ResourceMark rm(THREAD);
1768 
1769   oop fn = JNIHandles::resolve_external_guard(flag_name);
1770   if (fn == NULL) {
1771     THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1772               "The flag name cannot be null.");
1773   }
1774   char* name = java_lang_String::as_utf8_string(fn);
1775   Flag* flag = Flag::find_flag(name, strlen(name));
1776   if (flag == NULL) {
1777     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1778               "Flag does not exist.");
1779   }
1780   if (!flag->is_writeable()) {
1781     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1782               "This flag is not writeable.");
1783   }
1784 
1785   bool succeed;
1786   if (flag->is_bool()) {
1787     bool bvalue = (new_value.z == JNI_TRUE ? true : false);
1788     succeed = CommandLineFlags::boolAtPut(name, &bvalue, MANAGEMENT);
1789   } else if (flag->is_intx()) {
1790     intx ivalue = (intx)new_value.j;
1791     succeed = CommandLineFlags::intxAtPut(name, &ivalue, MANAGEMENT);
1792   } else if (flag->is_uintx()) {
1793     uintx uvalue = (uintx)new_value.j;
1794     succeed = CommandLineFlags::uintxAtPut(name, &uvalue, MANAGEMENT);
1795   } else if (flag->is_uint64_t()) {
1796     uint64_t uvalue = (uint64_t)new_value.j;
1797     succeed = CommandLineFlags::uint64_tAtPut(name, &uvalue, MANAGEMENT);
1798   } else if (flag->is_ccstr()) {
1799     oop str = JNIHandles::resolve_external_guard(new_value.l);
1800     if (str == NULL) {
1801       THROW(vmSymbols::java_lang_NullPointerException());
1802     }
1803     ccstr svalue = java_lang_String::as_utf8_string(str);
1804     succeed = CommandLineFlags::ccstrAtPut(name, &svalue, MANAGEMENT);
1805   }
1806   assert(succeed, "Setting flag should succeed");
1807 JVM_END
1808 
1809 class ThreadTimesClosure: public ThreadClosure {
1810  private:
1811   objArrayOop _names;
1812   typeArrayOop _times;
1813   int _names_len;
1814   int _times_len;
1815   int _count;
1816 
1817  public:
1818   ThreadTimesClosure(objArrayOop names, typeArrayOop times);
1819   virtual void do_thread(Thread* thread);
1820   int count() { return _count; }
1821 };
1822 
1823 ThreadTimesClosure::ThreadTimesClosure(objArrayOop names,
1824                                        typeArrayOop times) {
1825   assert(names != NULL, "names was NULL");
1826   assert(times != NULL, "times was NULL");
1827   _names = names;
1828   _names_len = names->length();
1829   _times = times;
1830   _times_len = times->length();
1831   _count = 0;
1832 }
1833 
1834 void ThreadTimesClosure::do_thread(Thread* thread) {
1835   Handle s;
1836   assert(thread != NULL, "thread was NULL");
1837 
1838   // exclude externally visible JavaThreads
1839   if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1840     return;
1841   }
1842 
1843   if (_count >= _names_len || _count >= _times_len) {
1844     // skip if the result array is not big enough
1845     return;
1846   }
1847 
1848   EXCEPTION_MARK;
1849 
1850   assert(thread->name() != NULL, "All threads should have a name");
1851   s = java_lang_String::create_from_str(thread->name(), CHECK);
1852   _names->obj_at_put(_count, s());
1853 
1854   _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1855                         os::thread_cpu_time(thread) : -1);
1856   _count++;
1857 }
1858 
1859 // Fills names with VM internal thread names and times with the corresponding
1860 // CPU times.  If names or times is NULL, a NullPointerException is thrown.
1861 // If the element type of names is not String, an IllegalArgumentException is
1862 // thrown.
1863 // If an array is not large enough to hold all the entries, only the entries
1864 // that fit will be returned.  Return value is the number of VM internal
1865 // threads entries.
1866 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1867                                            jobjectArray names,
1868                                            jlongArray times))
1869   if (names == NULL || times == NULL) {
1870      THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1871   }
1872   objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1873   objArrayHandle names_ah(THREAD, na);
1874 
1875   // Make sure we have a String array
1876   klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass();
1877   if (element_klass != SystemDictionary::String_klass()) {
1878     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1879                "Array element type is not String class", 0);
1880   }
1881 
1882   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1883   typeArrayHandle times_ah(THREAD, ta);
1884 
1885   ThreadTimesClosure ttc(names_ah(), times_ah());
1886   {
1887     MutexLockerEx ml(Threads_lock);
1888     Threads::threads_do(&ttc);
1889   }
1890 
1891   return ttc.count();
1892 JVM_END
1893 
1894 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1895   ResourceMark rm(THREAD);
1896 
1897   VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1898   VMThread::execute(&op);
1899 
1900   DeadlockCycle* deadlocks = op.result();
1901   if (deadlocks == NULL) {
1902     // no deadlock found and return
1903     return Handle();
1904   }
1905 
1906   int num_threads = 0;
1907   DeadlockCycle* cycle;
1908   for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1909     num_threads += cycle->num_threads();
1910   }
1911 
1912   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1913   objArrayHandle threads_ah(THREAD, r);
1914 
1915   int index = 0;
1916   for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1917     GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1918     int len = deadlock_threads->length();
1919     for (int i = 0; i < len; i++) {
1920       threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1921       index++;
1922     }
1923   }
1924   return threads_ah;
1925 }
1926 
1927 // Finds cycles of threads that are deadlocked involved in object monitors
1928 // and JSR-166 synchronizers.
1929 // Returns an array of Thread objects which are in deadlock, if any.
1930 // Otherwise, returns NULL.
1931 //
1932 // Input parameter:
1933 //    object_monitors_only - if true, only check object monitors
1934 //
1935 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1936   Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1937   return (jobjectArray) JNIHandles::make_local(env, result());
1938 JVM_END
1939 
1940 // Finds cycles of threads that are deadlocked on monitor locks
1941 // Returns an array of Thread objects which are in deadlock, if any.
1942 // Otherwise, returns NULL.
1943 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1944   Handle result = find_deadlocks(true, CHECK_0);
1945   return (jobjectArray) JNIHandles::make_local(env, result());
1946 JVM_END
1947 
1948 // Gets the information about GC extension attributes including
1949 // the name of the attribute, its type, and a short description.
1950 //
1951 // Input parameters:
1952 //   mgr   - GC memory manager
1953 //   info  - caller allocated array of jmmExtAttributeInfo
1954 //   count - number of elements of the info array
1955 //
1956 // Returns the number of GC extension attributes filled in the info array; or
1957 // -1 if info is not big enough
1958 //
1959 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1960   // All GC memory managers have 1 attribute (number of GC threads)
1961   if (count == 0) {
1962     return 0;
1963   }
1964 
1965   if (info == NULL) {
1966    THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1967   }
1968 
1969   info[0].name = "GcThreadCount";
1970   info[0].type = 'I';
1971   info[0].description = "Number of GC threads";
1972   return 1;
1973 JVM_END
1974 
1975 // verify the given array is an array of java/lang/management/MemoryUsage objects
1976 // of a given length and return the objArrayOop
1977 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1978   if (array == NULL) {
1979     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1980   }
1981 
1982   objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1983   objArrayHandle array_h(THREAD, oa);
1984 
1985   // array must be of the given length
1986   if (length != array_h->length()) {
1987     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1988                "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1989   }
1990 
1991   // check if the element of array is of type MemoryUsage class
1992   klassOop usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1993   klassOop element_klass = objArrayKlass::cast(array_h->klass())->element_klass();
1994   if (element_klass != usage_klass) {
1995     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1996                "The element type is not MemoryUsage class", 0);
1997   }
1998 
1999   return array_h();
2000 }
2001 
2002 // Gets the statistics of the last GC of a given GC memory manager.
2003 // Input parameters:
2004 //   obj     - GarbageCollectorMXBean object
2005 //   gc_stat - caller allocated jmmGCStat where:
2006 //     a. before_gc_usage - array of MemoryUsage objects
2007 //     b. after_gc_usage  - array of MemoryUsage objects
2008 //     c. gc_ext_attributes_values_size is set to the
2009 //        gc_ext_attribute_values array allocated
2010 //     d. gc_ext_attribute_values is a caller allocated array of jvalue.
2011 //
2012 // On return,
2013 //   gc_index == 0 indicates no GC statistics available
2014 //
2015 //   before_gc_usage and after_gc_usage - filled with per memory pool
2016 //      before and after GC usage in the same order as the memory pools
2017 //      returned by GetMemoryPools for a given GC memory manager.
2018 //   num_gc_ext_attributes indicates the number of elements in
2019 //      the gc_ext_attribute_values array is filled; or
2020 //      -1 if the gc_ext_attributes_values array is not big enough
2021 //
2022 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
2023   ResourceMark rm(THREAD);
2024 
2025   if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
2026     THROW(vmSymbols::java_lang_NullPointerException());
2027   }
2028 
2029   // Get the GCMemoryManager
2030   GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
2031 
2032   // Make a copy of the last GC statistics
2033   // GC may occur while constructing the last GC information
2034   int num_pools = MemoryService::num_memory_pools();
2035   GCStatInfo* stat = new GCStatInfo(num_pools);
2036   if (mgr->get_last_gc_stat(stat) == 0) {
2037     gc_stat->gc_index = 0;
2038     return;
2039   }
2040 
2041   gc_stat->gc_index = stat->gc_index();
2042   gc_stat->start_time = Management::ticks_to_ms(stat->start_time());
2043   gc_stat->end_time = Management::ticks_to_ms(stat->end_time());
2044 
2045   // Current implementation does not have GC extension attributes
2046   gc_stat->num_gc_ext_attributes = 0;
2047 
2048   // Fill the arrays of MemoryUsage objects with before and after GC
2049   // per pool memory usage
2050   objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
2051                                              num_pools,
2052                                              CHECK);
2053   objArrayHandle usage_before_gc_ah(THREAD, bu);
2054 
2055   objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
2056                                              num_pools,
2057                                              CHECK);
2058   objArrayHandle usage_after_gc_ah(THREAD, au);
2059 
2060   for (int i = 0; i < num_pools; i++) {
2061     Handle before_usage = MemoryService::create_MemoryUsage_obj(stat->before_gc_usage_for_pool(i), CHECK);
2062     Handle after_usage;
2063 
2064     MemoryUsage u = stat->after_gc_usage_for_pool(i);
2065     if (u.max_size() == 0 && u.used() > 0) {
2066       // If max size == 0, this pool is a survivor space.
2067       // Set max size = -1 since the pools will be swapped after GC.
2068       MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
2069       after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
2070     } else {
2071       after_usage = MemoryService::create_MemoryUsage_obj(stat->after_gc_usage_for_pool(i), CHECK);
2072     }
2073     usage_before_gc_ah->obj_at_put(i, before_usage());
2074     usage_after_gc_ah->obj_at_put(i, after_usage());
2075   }
2076 
2077   if (gc_stat->gc_ext_attribute_values_size > 0) {
2078     // Current implementation only has 1 attribute (number of GC threads)
2079     // The type is 'I'
2080     gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
2081   }
2082 JVM_END
2083 
2084 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
2085   ResourceMark rm(THREAD);
2086   // Get the GCMemoryManager
2087   GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
2088   mgr->set_notification_enabled(enabled?true:false);
2089 JVM_END
2090 
2091 // Dump heap - Returns 0 if succeeds.
2092 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
2093 #ifndef SERVICES_KERNEL
2094   ResourceMark rm(THREAD);
2095   oop on = JNIHandles::resolve_external_guard(outputfile);
2096   if (on == NULL) {
2097     THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
2098                "Output file name cannot be null.", -1);
2099   }
2100   char* name = java_lang_String::as_utf8_string(on);
2101   if (name == NULL) {
2102     THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
2103                "Output file name cannot be null.", -1);
2104   }
2105   HeapDumper dumper(live ? true : false);
2106   if (dumper.dump(name) != 0) {
2107     const char* errmsg = dumper.error_as_C_string();
2108     THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
2109   }
2110   return 0;
2111 #else  // SERVICES_KERNEL
2112   return -1;
2113 #endif // SERVICES_KERNEL
2114 JVM_END
2115 
2116 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
2117   ResourceMark rm(THREAD);
2118   GrowableArray<const char *>* dcmd_list = DCmdFactory::get_DCmd_list();
2119   objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
2120           dcmd_list->length(), CHECK_NULL);
2121   objArrayHandle cmd_array(THREAD, cmd_array_oop);
2122   for(int i=0; i<dcmd_list->length(); i++) {
2123     oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
2124     cmd_array->obj_at_put(i,cmd_name);
2125   }
2126   return (jobjectArray) JNIHandles::make_local(env, cmd_array());
2127 JVM_END
2128 
2129 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
2130         dcmdInfo* infoArray))
2131   if (cmds == NULL || infoArray == NULL) {
2132     THROW(vmSymbols::java_lang_NullPointerException());
2133   }
2134 
2135   ResourceMark rm(THREAD);
2136 
2137   objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
2138   objArrayHandle cmds_ah(THREAD, ca);
2139 
2140   // Make sure we have a String array
2141   klassOop element_klass = objArrayKlass::cast(cmds_ah->klass())->element_klass();
2142   if (element_klass != SystemDictionary::String_klass()) {
2143     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2144                "Array element type is not String class");
2145   }
2146 
2147   GrowableArray<DCmdInfo *>* info_list = DCmdFactory::get_DCmdInfo_list();
2148 
2149   int num_cmds = cmds_ah->length();
2150   for (int i = 0; i < num_cmds; i++) {
2151     oop cmd = cmds_ah->obj_at(i);
2152     if (cmd == NULL) {
2153         THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2154                 "Command name cannot be null.");
2155     }
2156     char* cmd_name = java_lang_String::as_utf8_string(cmd);
2157     if (cmd_name == NULL) {
2158         THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2159                 "Command name cannot be null.");
2160     }
2161     int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
2162     if(pos == -1) {
2163         THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2164              "Unknown diagnostic command");
2165     }
2166     DCmdInfo* info = info_list->at(pos);
2167     infoArray[i].name = info->get_name();
2168     infoArray[i].description = info->get_description();
2169     infoArray[i].impact = info->get_impact();
2170     infoArray[i].num_arguments = info->get_num_arguments();
2171     infoArray[i].enabled = info->is_enabled();
2172   }
2173 JVM_END
2174 
2175 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2176         jstring command, dcmdArgInfo* infoArray))
2177   ResourceMark rm(THREAD);
2178   oop cmd = JNIHandles::resolve_external_guard(command);
2179   if (cmd == NULL) {
2180     THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2181                "Command line cannot be null.");
2182   }
2183   char* cmd_name = java_lang_String::as_utf8_string(cmd);
2184   if (cmd_name == NULL) {
2185     THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2186                "Command line cannot be null.");
2187   }
2188   DCmd* dcmd = NULL;
2189   {
2190     DCmdFactory*factory = DCmdFactory::get_factory(cmd_name, strlen(cmd_name));
2191     if (factory != NULL) {
2192       dcmd = factory->get_cheap_instance(NULL);
2193     }
2194   }
2195   if(dcmd == NULL) {
2196     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2197              "Unknown diagnostic command");
2198   }
2199   DCmdMark mark(dcmd);
2200   GrowableArray<DCmdArgumentInfo*>* array = dcmd->get_argument_info_array();
2201   if(array->length() == 0) {
2202     return;
2203   }
2204   for(int i=0; i<array->length(); i++) {
2205       infoArray[i].name = array->at(i)->get_name();
2206       infoArray[i].description = array->at(i)->get_description();
2207       infoArray[i].type = array->at(i)->get_type();
2208       infoArray[i].default_string = array->at(i)->get_default();
2209       infoArray[i].mandatory = array->at(i)->is_mandatory();
2210       infoArray[i].option = array->at(i)->is_option();
2211       infoArray[i].position = array->at(i)->get_position();
2212   }
2213   return;
2214 JVM_END
2215 
2216 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2217   ResourceMark rm(THREAD);
2218   oop cmd = JNIHandles::resolve_external_guard(commandline);
2219   if (cmd == NULL) {
2220     THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2221                "Command line cannot be null.");
2222   }
2223   char* cmdline = java_lang_String::as_utf8_string(cmd);
2224   if (cmdline == NULL) {
2225     THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2226                "Command line cannot be null.");
2227   }
2228   bufferedStream output;
2229   DCmd::parse_and_execute(&output, cmdline, ' ', CHECK_NULL);
2230   oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2231   return (jstring) JNIHandles::make_local(env, result);
2232 JVM_END
2233 
2234 jlong Management::ticks_to_ms(jlong ticks) {
2235   assert(os::elapsed_frequency() > 0, "Must be non-zero");
2236   return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2237                  * (double)1000.0);
2238 }
2239 
2240 const struct jmmInterface_1_ jmm_interface = {
2241   NULL,
2242   NULL,
2243   jmm_GetVersion,
2244   jmm_GetOptionalSupport,
2245   jmm_GetInputArguments,
2246   jmm_GetThreadInfo,
2247   jmm_GetInputArgumentArray,
2248   jmm_GetMemoryPools,
2249   jmm_GetMemoryManagers,
2250   jmm_GetMemoryPoolUsage,
2251   jmm_GetPeakMemoryPoolUsage,
2252   jmm_GetThreadAllocatedMemory,
2253   jmm_GetMemoryUsage,
2254   jmm_GetLongAttribute,
2255   jmm_GetBoolAttribute,
2256   jmm_SetBoolAttribute,
2257   jmm_GetLongAttributes,
2258   jmm_FindMonitorDeadlockedThreads,
2259   jmm_GetThreadCpuTime,
2260   jmm_GetVMGlobalNames,
2261   jmm_GetVMGlobals,
2262   jmm_GetInternalThreadTimes,
2263   jmm_ResetStatistic,
2264   jmm_SetPoolSensor,
2265   jmm_SetPoolThreshold,
2266   jmm_GetPoolCollectionUsage,
2267   jmm_GetGCExtAttributeInfo,
2268   jmm_GetLastGCStat,
2269   jmm_GetThreadCpuTimeWithKind,
2270   jmm_GetThreadCpuTimesWithKind,
2271   jmm_DumpHeap0,
2272   jmm_FindDeadlockedThreads,
2273   jmm_SetVMGlobal,
2274   NULL,
2275   jmm_DumpThreads,
2276   jmm_SetGCNotificationEnabled,
2277   jmm_GetDiagnosticCommands,
2278   jmm_GetDiagnosticCommandInfo,
2279   jmm_GetDiagnosticCommandArgumentsInfo,
2280   jmm_ExecuteDiagnosticCommand
2281 };
2282 
2283 void* Management::get_jmm_interface(int version) {
2284   if (version == JMM_VERSION_1_0) {
2285     return (void*) &jmm_interface;
2286   }
2287   return NULL;
2288 }
--- EOF ---