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/heapDumper.hpp"

  44 #include "services/lowMemoryDetector.hpp"
  45 #include "services/gcNotifier.hpp"
  46 #include "services/management.hpp"
  47 #include "services/memoryManager.hpp"
  48 #include "services/memoryPool.hpp"
  49 #include "services/memoryService.hpp"
  50 #include "services/runtimeService.hpp"
  51 #include "services/threadService.hpp"
  52 
  53 PerfVariable* Management::_begin_vm_creation_time = NULL;
  54 PerfVariable* Management::_end_vm_creation_time = NULL;
  55 PerfVariable* Management::_vm_init_done_time = NULL;
  56 
  57 klassOop Management::_sensor_klass = NULL;
  58 klassOop Management::_threadInfo_klass = NULL;
  59 klassOop Management::_memoryUsage_klass = NULL;
  60 klassOop Management::_memoryPoolMXBean_klass = NULL;
  61 klassOop Management::_memoryManagerMXBean_klass = NULL;
  62 klassOop Management::_garbageCollectorMXBean_klass = NULL;
  63 klassOop Management::_managementFactory_klass = NULL;
  64 klassOop Management::_garbageCollectorImpl_klass = NULL;
  65 klassOop Management::_gcInfo_klass = NULL;
  66 
  67 jmmOptionalSupport Management::_optional_support = {0};
  68 TimeStamp Management::_stamp;
  69 
  70 void management_init() {
  71   Management::init();
  72   ThreadService::init();
  73   RuntimeService::init();
  74   ClassLoadingService::init();
  75 }
  76 
  77 void Management::init() {
  78   EXCEPTION_MARK;
  79 
  80   // These counters are for java.lang.management API support.
  81   // They are created even if -XX:-UsePerfData is set and in
  82   // that case, they will be allocated on C heap.
  83 
  84   _begin_vm_creation_time =
  85             PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
  86                                              PerfData::U_None, CHECK);
  87 
  88   _end_vm_creation_time =
  89             PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
  90                                              PerfData::U_None, CHECK);
  91 
  92   _vm_init_done_time =
  93             PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
  94                                              PerfData::U_None, CHECK);
  95 
  96   // Initialize optional support
  97   _optional_support.isLowMemoryDetectionSupported = 1;
  98   _optional_support.isCompilationTimeMonitoringSupported = 1;
  99   _optional_support.isThreadContentionMonitoringSupported = 1;
 100 
 101   if (os::is_thread_cpu_time_supported()) {
 102     _optional_support.isCurrentThreadCpuTimeSupported = 1;
 103     _optional_support.isOtherThreadCpuTimeSupported = 1;
 104   } else {
 105     _optional_support.isCurrentThreadCpuTimeSupported = 0;
 106     _optional_support.isOtherThreadCpuTimeSupported = 0;
 107   }
 108 
 109   _optional_support.isBootClassPathSupported = 1;
 110   _optional_support.isObjectMonitorUsageSupported = 1;
 111 #ifndef SERVICES_KERNEL
 112   // This depends on the heap inspector
 113   _optional_support.isSynchronizerUsageSupported = 1;
 114 #endif // SERVICES_KERNEL
 115   _optional_support.isThreadAllocatedMemorySupported = 1;



 116 }
 117 
 118 void Management::initialize(TRAPS) {
 119   // Start the service thread
 120   ServiceThread::initialize();
 121 
 122   if (ManagementServer) {
 123     ResourceMark rm(THREAD);
 124     HandleMark hm(THREAD);
 125 
 126     // Load and initialize the sun.management.Agent class
 127     // invoke startAgent method to start the management server
 128     Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
 129     klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::sun_management_Agent(),
 130                                                    loader,
 131                                                    Handle(),
 132                                                    true,
 133                                                    CHECK);
 134     instanceKlassHandle ik (THREAD, k);
 135 
 136     JavaValue result(T_VOID);
 137     JavaCalls::call_static(&result,
 138                            ik,
 139                            vmSymbols::startAgent_name(),
 140                            vmSymbols::void_method_signature(),
 141                            CHECK);
 142   }
 143 }
 144 
 145 void Management::get_optional_support(jmmOptionalSupport* support) {
 146   memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
 147 }
 148 
 149 klassOop Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
 150   klassOop k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
 151   instanceKlassHandle ik (THREAD, k);
 152   if (ik->should_be_initialized()) {
 153     ik->initialize(CHECK_NULL);
 154   }
 155   return ik();
 156 }
 157 
 158 void Management::record_vm_startup_time(jlong begin, jlong duration) {
 159   // if the performance counter is not initialized,
 160   // then vm initialization failed; simply return.
 161   if (_begin_vm_creation_time == NULL) return;
 162 
 163   _begin_vm_creation_time->set_value(begin);
 164   _end_vm_creation_time->set_value(begin + duration);
 165   PerfMemory::set_accessible(true);
 166 }
 167 
 168 jlong Management::timestamp() {
 169   TimeStamp t;
 170   t.update();
 171   return t.ticks() - _stamp.ticks();
 172 }
 173 
 174 void Management::oops_do(OopClosure* f) {
 175   MemoryService::oops_do(f);
 176   ThreadService::oops_do(f);
 177 
 178   f->do_oop((oop*) &_sensor_klass);
 179   f->do_oop((oop*) &_threadInfo_klass);
 180   f->do_oop((oop*) &_memoryUsage_klass);
 181   f->do_oop((oop*) &_memoryPoolMXBean_klass);
 182   f->do_oop((oop*) &_memoryManagerMXBean_klass);
 183   f->do_oop((oop*) &_garbageCollectorMXBean_klass);
 184   f->do_oop((oop*) &_managementFactory_klass);
 185   f->do_oop((oop*) &_garbageCollectorImpl_klass);
 186   f->do_oop((oop*) &_gcInfo_klass);
 187 }
 188 
 189 klassOop Management::java_lang_management_ThreadInfo_klass(TRAPS) {
 190   if (_threadInfo_klass == NULL) {
 191     _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
 192   }
 193   return _threadInfo_klass;
 194 }
 195 
 196 klassOop Management::java_lang_management_MemoryUsage_klass(TRAPS) {
 197   if (_memoryUsage_klass == NULL) {
 198     _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
 199   }
 200   return _memoryUsage_klass;
 201 }
 202 
 203 klassOop Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
 204   if (_memoryPoolMXBean_klass == NULL) {
 205     _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
 206   }
 207   return _memoryPoolMXBean_klass;
 208 }
 209 
 210 klassOop Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
 211   if (_memoryManagerMXBean_klass == NULL) {
 212     _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
 213   }
 214   return _memoryManagerMXBean_klass;
 215 }
 216 
 217 klassOop Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
 218   if (_garbageCollectorMXBean_klass == NULL) {
 219       _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
 220   }
 221   return _garbageCollectorMXBean_klass;
 222 }
 223 
 224 klassOop Management::sun_management_Sensor_klass(TRAPS) {
 225   if (_sensor_klass == NULL) {
 226     _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
 227   }
 228   return _sensor_klass;
 229 }
 230 
 231 klassOop Management::sun_management_ManagementFactory_klass(TRAPS) {
 232   if (_managementFactory_klass == NULL) {
 233     _managementFactory_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactory(), CHECK_NULL);
 234   }
 235   return _managementFactory_klass;
 236 }
 237 
 238 klassOop Management::sun_management_GarbageCollectorImpl_klass(TRAPS) {
 239   if (_garbageCollectorImpl_klass == NULL) {
 240     _garbageCollectorImpl_klass = load_and_initialize_klass(vmSymbols::sun_management_GarbageCollectorImpl(), CHECK_NULL);
 241   }
 242   return _garbageCollectorImpl_klass;
 243 }
 244 
 245 klassOop Management::com_sun_management_GcInfo_klass(TRAPS) {
 246   if (_gcInfo_klass == NULL) {
 247     _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
 248   }
 249   return _gcInfo_klass;
 250 }
 251 
 252 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
 253   Handle snapshot_thread(THREAD, snapshot->threadObj());
 254 
 255   jlong contended_time;
 256   jlong waited_time;
 257   if (ThreadService::is_thread_monitoring_contention()) {
 258     contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
 259     waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
 260   } else {
 261     // set them to -1 if thread contention monitoring is disabled.
 262     contended_time = max_julong;
 263     waited_time = max_julong;
 264   }
 265 
 266   int thread_status = snapshot->thread_status();
 267   assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
 268   if (snapshot->is_ext_suspended()) {
 269     thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
 270   }
 271   if (snapshot->is_in_native()) {
 272     thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
 273   }
 274 
 275   ThreadStackTrace* st = snapshot->get_stack_trace();
 276   Handle stacktrace_h;
 277   if (st != NULL) {
 278     stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
 279   } else {
 280     stacktrace_h = Handle();
 281   }
 282 
 283   args->push_oop(snapshot_thread);
 284   args->push_int(thread_status);
 285   args->push_oop(Handle(THREAD, snapshot->blocker_object()));
 286   args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
 287   args->push_long(snapshot->contended_enter_count());
 288   args->push_long(contended_time);
 289   args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
 290   args->push_long(waited_time);
 291   args->push_oop(stacktrace_h);
 292 }
 293 
 294 // Helper function to construct a ThreadInfo object
 295 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
 296   klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
 297   instanceKlassHandle ik (THREAD, k);
 298 
 299   JavaValue result(T_VOID);
 300   JavaCallArguments args(14);
 301 
 302   // First allocate a ThreadObj object and
 303   // push the receiver as the first argument
 304   Handle element = ik->allocate_instance_handle(CHECK_NULL);
 305   args.push_oop(element);
 306 
 307   // initialize the arguments for the ThreadInfo constructor
 308   initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
 309 
 310   // Call ThreadInfo constructor with no locked monitors and synchronizers
 311   JavaCalls::call_special(&result,
 312                           ik,
 313                           vmSymbols::object_initializer_name(),
 314                           vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
 315                           &args,
 316                           CHECK_NULL);
 317 
 318   return (instanceOop) element();
 319 }
 320 
 321 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
 322                                                     objArrayHandle monitors_array,
 323                                                     typeArrayHandle depths_array,
 324                                                     objArrayHandle synchronizers_array,
 325                                                     TRAPS) {
 326   klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
 327   instanceKlassHandle ik (THREAD, k);
 328 
 329   JavaValue result(T_VOID);
 330   JavaCallArguments args(17);
 331 
 332   // First allocate a ThreadObj object and
 333   // push the receiver as the first argument
 334   Handle element = ik->allocate_instance_handle(CHECK_NULL);
 335   args.push_oop(element);
 336 
 337   // initialize the arguments for the ThreadInfo constructor
 338   initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
 339 
 340   // push the locked monitors and synchronizers in the arguments
 341   args.push_oop(monitors_array);
 342   args.push_oop(depths_array);
 343   args.push_oop(synchronizers_array);
 344 
 345   // Call ThreadInfo constructor with locked monitors and synchronizers
 346   JavaCalls::call_special(&result,
 347                           ik,
 348                           vmSymbols::object_initializer_name(),
 349                           vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
 350                           &args,
 351                           CHECK_NULL);
 352 
 353   return (instanceOop) element();
 354 }
 355 
 356 // Helper functions
 357 static JavaThread* find_java_thread_from_id(jlong thread_id) {
 358   assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
 359 
 360   JavaThread* java_thread = NULL;
 361   // Sequential search for now.  Need to do better optimization later.
 362   for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
 363     oop tobj = thread->threadObj();
 364     if (!thread->is_exiting() &&
 365         tobj != NULL &&
 366         thread_id == java_lang_Thread::thread_id(tobj)) {
 367       java_thread = thread;
 368       break;
 369     }
 370   }
 371   return java_thread;
 372 }
 373 
 374 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
 375   if (mgr == NULL) {
 376     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
 377   }
 378   oop mgr_obj = JNIHandles::resolve(mgr);
 379   instanceHandle h(THREAD, (instanceOop) mgr_obj);
 380 
 381   klassOop k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
 382   if (!h->is_a(k)) {
 383     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
 384                "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
 385                NULL);
 386   }
 387 
 388   MemoryManager* gc = MemoryService::get_memory_manager(h);
 389   if (gc == NULL || !gc->is_gc_memory_manager()) {
 390     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
 391                "Invalid GC memory manager",
 392                NULL);
 393   }
 394   return (GCMemoryManager*) gc;
 395 }
 396 
 397 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
 398   if (obj == NULL) {
 399     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
 400   }
 401 
 402   oop pool_obj = JNIHandles::resolve(obj);
 403   assert(pool_obj->is_instance(), "Should be an instanceOop");
 404   instanceHandle ph(THREAD, (instanceOop) pool_obj);
 405 
 406   return MemoryService::get_memory_pool(ph);
 407 }
 408 
 409 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
 410   int num_threads = ids_ah->length();
 411 
 412   // Validate input thread IDs
 413   int i = 0;
 414   for (i = 0; i < num_threads; i++) {
 415     jlong tid = ids_ah->long_at(i);
 416     if (tid <= 0) {
 417       // throw exception if invalid thread id.
 418       THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
 419                 "Invalid thread ID entry");
 420     }
 421   }
 422 }
 423 
 424 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
 425   // check if the element of infoArray is of type ThreadInfo class
 426   klassOop threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
 427   klassOop element_klass = objArrayKlass::cast(infoArray_h->klass())->element_klass();
 428   if (element_klass != threadinfo_klass) {
 429     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
 430               "infoArray element type is not ThreadInfo class");
 431   }
 432 }
 433 
 434 
 435 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
 436   if (obj == NULL) {
 437     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
 438   }
 439 
 440   oop mgr_obj = JNIHandles::resolve(obj);
 441   assert(mgr_obj->is_instance(), "Should be an instanceOop");
 442   instanceHandle mh(THREAD, (instanceOop) mgr_obj);
 443 
 444   return MemoryService::get_memory_manager(mh);
 445 }
 446 
 447 // Returns a version string and sets major and minor version if
 448 // the input parameters are non-null.
 449 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
 450   return JMM_VERSION;
 451 JVM_END
 452 
 453 // Gets the list of VM monitoring and management optional supports
 454 // Returns 0 if succeeded; otherwise returns non-zero.
 455 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
 456   if (support == NULL) {
 457     return -1;
 458   }
 459   Management::get_optional_support(support);
 460   return 0;
 461 JVM_END
 462 
 463 // Returns a java.lang.String object containing the input arguments to the VM.
 464 JVM_ENTRY(jobject, jmm_GetInputArguments(JNIEnv *env))
 465   ResourceMark rm(THREAD);
 466 
 467   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
 468     return NULL;
 469   }
 470 
 471   char** vm_flags = Arguments::jvm_flags_array();
 472   char** vm_args  = Arguments::jvm_args_array();
 473   int num_flags   = Arguments::num_jvm_flags();
 474   int num_args    = Arguments::num_jvm_args();
 475 
 476   size_t length = 1; // null terminator
 477   int i;
 478   for (i = 0; i < num_flags; i++) {
 479     length += strlen(vm_flags[i]);
 480   }
 481   for (i = 0; i < num_args; i++) {
 482     length += strlen(vm_args[i]);
 483   }
 484   // add a space between each argument
 485   length += num_flags + num_args - 1;
 486 
 487   // Return the list of input arguments passed to the VM
 488   // and preserve the order that the VM processes.
 489   char* args = NEW_RESOURCE_ARRAY(char, length);
 490   args[0] = '\0';
 491   // concatenate all jvm_flags
 492   if (num_flags > 0) {
 493     strcat(args, vm_flags[0]);
 494     for (i = 1; i < num_flags; i++) {
 495       strcat(args, " ");
 496       strcat(args, vm_flags[i]);
 497     }
 498   }
 499 
 500   if (num_args > 0 && num_flags > 0) {
 501     // append a space if args already contains one or more jvm_flags
 502     strcat(args, " ");
 503   }
 504 
 505   // concatenate all jvm_args
 506   if (num_args > 0) {
 507     strcat(args, vm_args[0]);
 508     for (i = 1; i < num_args; i++) {
 509       strcat(args, " ");
 510       strcat(args, vm_args[i]);
 511     }
 512   }
 513 
 514   Handle hargs = java_lang_String::create_from_platform_dependent_str(args, CHECK_NULL);
 515   return JNIHandles::make_local(env, hargs());
 516 JVM_END
 517 
 518 // Returns an array of java.lang.String object containing the input arguments to the VM.
 519 JVM_ENTRY(jobjectArray, jmm_GetInputArgumentArray(JNIEnv *env))
 520   ResourceMark rm(THREAD);
 521 
 522   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
 523     return NULL;
 524   }
 525 
 526   char** vm_flags = Arguments::jvm_flags_array();
 527   char** vm_args = Arguments::jvm_args_array();
 528   int num_flags = Arguments::num_jvm_flags();
 529   int num_args = Arguments::num_jvm_args();
 530 
 531   instanceKlassHandle ik (THREAD, SystemDictionary::String_klass());
 532   objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL);
 533   objArrayHandle result_h(THREAD, r);
 534 
 535   int index = 0;
 536   for (int j = 0; j < num_flags; j++, index++) {
 537     Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
 538     result_h->obj_at_put(index, h());
 539   }
 540   for (int i = 0; i < num_args; i++, index++) {
 541     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
 542     result_h->obj_at_put(index, h());
 543   }
 544   return (jobjectArray) JNIHandles::make_local(env, result_h());
 545 JVM_END
 546 
 547 // Returns an array of java/lang/management/MemoryPoolMXBean object
 548 // one for each memory pool if obj == null; otherwise returns
 549 // an array of memory pools for a given memory manager if
 550 // it is a valid memory manager.
 551 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
 552   ResourceMark rm(THREAD);
 553 
 554   int num_memory_pools;
 555   MemoryManager* mgr = NULL;
 556   if (obj == NULL) {
 557     num_memory_pools = MemoryService::num_memory_pools();
 558   } else {
 559     mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
 560     if (mgr == NULL) {
 561       return NULL;
 562     }
 563     num_memory_pools = mgr->num_memory_pools();
 564   }
 565 
 566   // Allocate the resulting MemoryPoolMXBean[] object
 567   klassOop k = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
 568   instanceKlassHandle ik (THREAD, k);
 569   objArrayOop r = oopFactory::new_objArray(ik(), num_memory_pools, CHECK_NULL);
 570   objArrayHandle poolArray(THREAD, r);
 571 
 572   if (mgr == NULL) {
 573     // Get all memory pools
 574     for (int i = 0; i < num_memory_pools; i++) {
 575       MemoryPool* pool = MemoryService::get_memory_pool(i);
 576       instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
 577       instanceHandle ph(THREAD, p);
 578       poolArray->obj_at_put(i, ph());
 579     }
 580   } else {
 581     // Get memory pools managed by a given memory manager
 582     for (int i = 0; i < num_memory_pools; i++) {
 583       MemoryPool* pool = mgr->get_memory_pool(i);
 584       instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
 585       instanceHandle ph(THREAD, p);
 586       poolArray->obj_at_put(i, ph());
 587     }
 588   }
 589   return (jobjectArray) JNIHandles::make_local(env, poolArray());
 590 JVM_END
 591 
 592 // Returns an array of java/lang/management/MemoryManagerMXBean object
 593 // one for each memory manager if obj == null; otherwise returns
 594 // an array of memory managers for a given memory pool if
 595 // it is a valid memory pool.
 596 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
 597   ResourceMark rm(THREAD);
 598 
 599   int num_mgrs;
 600   MemoryPool* pool = NULL;
 601   if (obj == NULL) {
 602     num_mgrs = MemoryService::num_memory_managers();
 603   } else {
 604     pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 605     if (pool == NULL) {
 606       return NULL;
 607     }
 608     num_mgrs = pool->num_memory_managers();
 609   }
 610 
 611   // Allocate the resulting MemoryManagerMXBean[] object
 612   klassOop k = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
 613   instanceKlassHandle ik (THREAD, k);
 614   objArrayOop r = oopFactory::new_objArray(ik(), num_mgrs, CHECK_NULL);
 615   objArrayHandle mgrArray(THREAD, r);
 616 
 617   if (pool == NULL) {
 618     // Get all memory managers
 619     for (int i = 0; i < num_mgrs; i++) {
 620       MemoryManager* mgr = MemoryService::get_memory_manager(i);
 621       instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
 622       instanceHandle ph(THREAD, p);
 623       mgrArray->obj_at_put(i, ph());
 624     }
 625   } else {
 626     // Get memory managers for a given memory pool
 627     for (int i = 0; i < num_mgrs; i++) {
 628       MemoryManager* mgr = pool->get_memory_manager(i);
 629       instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
 630       instanceHandle ph(THREAD, p);
 631       mgrArray->obj_at_put(i, ph());
 632     }
 633   }
 634   return (jobjectArray) JNIHandles::make_local(env, mgrArray());
 635 JVM_END
 636 
 637 
 638 // Returns a java/lang/management/MemoryUsage object containing the memory usage
 639 // of a given memory pool.
 640 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
 641   ResourceMark rm(THREAD);
 642 
 643   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 644   if (pool != NULL) {
 645     MemoryUsage usage = pool->get_memory_usage();
 646     Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 647     return JNIHandles::make_local(env, h());
 648   } else {
 649     return NULL;
 650   }
 651 JVM_END
 652 
 653 // Returns a java/lang/management/MemoryUsage object containing the memory usage
 654 // of a given memory pool.
 655 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
 656   ResourceMark rm(THREAD);
 657 
 658   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 659   if (pool != NULL) {
 660     MemoryUsage usage = pool->get_peak_memory_usage();
 661     Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 662     return JNIHandles::make_local(env, h());
 663   } else {
 664     return NULL;
 665   }
 666 JVM_END
 667 
 668 // Returns a java/lang/management/MemoryUsage object containing the memory usage
 669 // of a given memory pool after most recent GC.
 670 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
 671   ResourceMark rm(THREAD);
 672 
 673   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
 674   if (pool != NULL && pool->is_collected_pool()) {
 675     MemoryUsage usage = pool->get_last_collection_usage();
 676     Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 677     return JNIHandles::make_local(env, h());
 678   } else {
 679     return NULL;
 680   }
 681 JVM_END
 682 
 683 // Sets the memory pool sensor for a threshold type
 684 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
 685   if (obj == NULL || sensorObj == NULL) {
 686     THROW(vmSymbols::java_lang_NullPointerException());
 687   }
 688 
 689   klassOop sensor_klass = Management::sun_management_Sensor_klass(CHECK);
 690   oop s = JNIHandles::resolve(sensorObj);
 691   assert(s->is_instance(), "Sensor should be an instanceOop");
 692   instanceHandle sensor_h(THREAD, (instanceOop) s);
 693   if (!sensor_h->is_a(sensor_klass)) {
 694     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
 695               "Sensor is not an instance of sun.management.Sensor class");
 696   }
 697 
 698   MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
 699   assert(mpool != NULL, "MemoryPool should exist");
 700 
 701   switch (type) {
 702     case JMM_USAGE_THRESHOLD_HIGH:
 703     case JMM_USAGE_THRESHOLD_LOW:
 704       // have only one sensor for threshold high and low
 705       mpool->set_usage_sensor_obj(sensor_h);
 706       break;
 707     case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
 708     case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
 709       // have only one sensor for threshold high and low
 710       mpool->set_gc_usage_sensor_obj(sensor_h);
 711       break;
 712     default:
 713       assert(false, "Unrecognized type");
 714   }
 715 
 716 JVM_END
 717 
 718 
 719 // Sets the threshold of a given memory pool.
 720 // Returns the previous threshold.
 721 //
 722 // Input parameters:
 723 //   pool      - the MemoryPoolMXBean object
 724 //   type      - threshold type
 725 //   threshold - the new threshold (must not be negative)
 726 //
 727 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
 728   if (threshold < 0) {
 729     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
 730                "Invalid threshold value",
 731                -1);
 732   }
 733 
 734   if ((size_t)threshold > max_uintx) {
 735     stringStream st;
 736     st.print("Invalid valid threshold value. Threshold value (" UINT64_FORMAT ") > max value of size_t (" SIZE_FORMAT ")", (size_t)threshold, max_uintx);
 737     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
 738   }
 739 
 740   MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
 741   assert(pool != NULL, "MemoryPool should exist");
 742 
 743   jlong prev = 0;
 744   switch (type) {
 745     case JMM_USAGE_THRESHOLD_HIGH:
 746       if (!pool->usage_threshold()->is_high_threshold_supported()) {
 747         return -1;
 748       }
 749       prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
 750       break;
 751 
 752     case JMM_USAGE_THRESHOLD_LOW:
 753       if (!pool->usage_threshold()->is_low_threshold_supported()) {
 754         return -1;
 755       }
 756       prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
 757       break;
 758 
 759     case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
 760       if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
 761         return -1;
 762       }
 763       // return and the new threshold is effective for the next GC
 764       return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
 765 
 766     case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
 767       if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
 768         return -1;
 769       }
 770       // return and the new threshold is effective for the next GC
 771       return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
 772 
 773     default:
 774       assert(false, "Unrecognized type");
 775       return -1;
 776   }
 777 
 778   // When the threshold is changed, reevaluate if the low memory
 779   // detection is enabled.
 780   if (prev != threshold) {
 781     LowMemoryDetector::recompute_enabled_for_collected_pools();
 782     LowMemoryDetector::detect_low_memory(pool);
 783   }
 784   return prev;
 785 JVM_END
 786 
 787 // Gets an array containing the amount of memory allocated on the Java
 788 // heap for a set of threads (in bytes).  Each element of the array is
 789 // the amount of memory allocated for the thread ID specified in the
 790 // corresponding entry in the given array of thread IDs; or -1 if the
 791 // thread does not exist or has terminated.
 792 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
 793                                              jlongArray sizeArray))
 794   // Check if threads is null
 795   if (ids == NULL || sizeArray == NULL) {
 796     THROW(vmSymbols::java_lang_NullPointerException());
 797   }
 798 
 799   ResourceMark rm(THREAD);
 800   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
 801   typeArrayHandle ids_ah(THREAD, ta);
 802 
 803   typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
 804   typeArrayHandle sizeArray_h(THREAD, sa);
 805 
 806   // validate the thread id array
 807   validate_thread_id_array(ids_ah, CHECK);
 808 
 809   // sizeArray must be of the same length as the given array of thread IDs
 810   int num_threads = ids_ah->length();
 811   if (num_threads != sizeArray_h->length()) {
 812     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
 813               "The length of the given long array does not match the length of "
 814               "the given array of thread IDs");
 815   }
 816 
 817   MutexLockerEx ml(Threads_lock);
 818   for (int i = 0; i < num_threads; i++) {
 819     JavaThread* java_thread = find_java_thread_from_id(ids_ah->long_at(i));
 820     if (java_thread != NULL) {
 821       sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
 822     }
 823   }
 824 JVM_END
 825 
 826 // Returns a java/lang/management/MemoryUsage object representing
 827 // the memory usage for the heap or non-heap memory.
 828 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
 829   ResourceMark rm(THREAD);
 830 
 831   // Calculate the memory usage
 832   size_t total_init = 0;
 833   size_t total_used = 0;
 834   size_t total_committed = 0;
 835   size_t total_max = 0;
 836   bool   has_undefined_init_size = false;
 837   bool   has_undefined_max_size = false;
 838 
 839   for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
 840     MemoryPool* pool = MemoryService::get_memory_pool(i);
 841     if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
 842       MemoryUsage u = pool->get_memory_usage();
 843       total_used += u.used();
 844       total_committed += u.committed();
 845 
 846       // if any one of the memory pool has undefined init_size or max_size,
 847       // set it to -1
 848       if (u.init_size() == (size_t)-1) {
 849         has_undefined_init_size = true;
 850       }
 851       if (!has_undefined_init_size) {
 852         total_init += u.init_size();
 853       }
 854 
 855       if (u.max_size() == (size_t)-1) {
 856         has_undefined_max_size = true;
 857       }
 858       if (!has_undefined_max_size) {
 859         total_max += u.max_size();
 860       }
 861     }
 862   }
 863 
 864   // In our current implementation, we make sure that all non-heap
 865   // pools have defined init and max sizes. Heap pools do not matter,
 866   // as we never use total_init and total_max for them.
 867   assert(heap || !has_undefined_init_size, "Undefined init size");
 868   assert(heap || !has_undefined_max_size,  "Undefined max size");
 869 
 870   MemoryUsage usage((heap ? InitialHeapSize : total_init),
 871                     total_used,
 872                     total_committed,
 873                     (heap ? Universe::heap()->max_capacity() : total_max));
 874 
 875   Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 876   return JNIHandles::make_local(env, obj());
 877 JVM_END
 878 
 879 // Returns the boolean value of a given attribute.
 880 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
 881   switch (att) {
 882   case JMM_VERBOSE_GC:
 883     return MemoryService::get_verbose();
 884   case JMM_VERBOSE_CLASS:
 885     return ClassLoadingService::get_verbose();
 886   case JMM_THREAD_CONTENTION_MONITORING:
 887     return ThreadService::is_thread_monitoring_contention();
 888   case JMM_THREAD_CPU_TIME:
 889     return ThreadService::is_thread_cpu_time_enabled();
 890   case JMM_THREAD_ALLOCATED_MEMORY:
 891     return ThreadService::is_thread_allocated_memory_enabled();
 892   default:
 893     assert(0, "Unrecognized attribute");
 894     return false;
 895   }
 896 JVM_END
 897 
 898 // Sets the given boolean attribute and returns the previous value.
 899 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
 900   switch (att) {
 901   case JMM_VERBOSE_GC:
 902     return MemoryService::set_verbose(flag != 0);
 903   case JMM_VERBOSE_CLASS:
 904     return ClassLoadingService::set_verbose(flag != 0);
 905   case JMM_THREAD_CONTENTION_MONITORING:
 906     return ThreadService::set_thread_monitoring_contention(flag != 0);
 907   case JMM_THREAD_CPU_TIME:
 908     return ThreadService::set_thread_cpu_time_enabled(flag != 0);
 909   case JMM_THREAD_ALLOCATED_MEMORY:
 910     return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
 911   default:
 912     assert(0, "Unrecognized attribute");
 913     return false;
 914   }
 915 JVM_END
 916 
 917 
 918 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
 919   switch (att) {
 920   case JMM_GC_TIME_MS:
 921     return mgr->gc_time_ms();
 922 
 923   case JMM_GC_COUNT:
 924     return mgr->gc_count();
 925 
 926   case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
 927     // current implementation only has 1 ext attribute
 928     return 1;
 929 
 930   default:
 931     assert(0, "Unrecognized GC attribute");
 932     return -1;
 933   }
 934 }
 935 
 936 class VmThreadCountClosure: public ThreadClosure {
 937  private:
 938   int _count;
 939  public:
 940   VmThreadCountClosure() : _count(0) {};
 941   void do_thread(Thread* thread);
 942   int count() { return _count; }
 943 };
 944 
 945 void VmThreadCountClosure::do_thread(Thread* thread) {
 946   // exclude externally visible JavaThreads
 947   if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
 948     return;
 949   }
 950 
 951   _count++;
 952 }
 953 
 954 static jint get_vm_thread_count() {
 955   VmThreadCountClosure vmtcc;
 956   {
 957     MutexLockerEx ml(Threads_lock);
 958     Threads::threads_do(&vmtcc);
 959   }
 960 
 961   return vmtcc.count();
 962 }
 963 
 964 static jint get_num_flags() {
 965   // last flag entry is always NULL, so subtract 1
 966   int nFlags = (int) Flag::numFlags - 1;
 967   int count = 0;
 968   for (int i = 0; i < nFlags; i++) {
 969     Flag* flag = &Flag::flags[i];
 970     // Exclude the locked (diagnostic, experimental) flags
 971     if (flag->is_unlocked() || flag->is_unlocker()) {
 972       count++;
 973     }
 974   }
 975   return count;
 976 }
 977 
 978 static jlong get_long_attribute(jmmLongAttribute att) {
 979   switch (att) {
 980   case JMM_CLASS_LOADED_COUNT:
 981     return ClassLoadingService::loaded_class_count();
 982 
 983   case JMM_CLASS_UNLOADED_COUNT:
 984     return ClassLoadingService::unloaded_class_count();
 985 
 986   case JMM_THREAD_TOTAL_COUNT:
 987     return ThreadService::get_total_thread_count();
 988 
 989   case JMM_THREAD_LIVE_COUNT:
 990     return ThreadService::get_live_thread_count();
 991 
 992   case JMM_THREAD_PEAK_COUNT:
 993     return ThreadService::get_peak_thread_count();
 994 
 995   case JMM_THREAD_DAEMON_COUNT:
 996     return ThreadService::get_daemon_thread_count();
 997 
 998   case JMM_JVM_INIT_DONE_TIME_MS:
 999     return Management::vm_init_done_time();
1000 
1001   case JMM_COMPILE_TOTAL_TIME_MS:
1002     return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
1003 
1004   case JMM_OS_PROCESS_ID:
1005     return os::current_process_id();
1006 
1007   // Hotspot-specific counters
1008   case JMM_CLASS_LOADED_BYTES:
1009     return ClassLoadingService::loaded_class_bytes();
1010 
1011   case JMM_CLASS_UNLOADED_BYTES:
1012     return ClassLoadingService::unloaded_class_bytes();
1013 
1014   case JMM_SHARED_CLASS_LOADED_COUNT:
1015     return ClassLoadingService::loaded_shared_class_count();
1016 
1017   case JMM_SHARED_CLASS_UNLOADED_COUNT:
1018     return ClassLoadingService::unloaded_shared_class_count();
1019 
1020 
1021   case JMM_SHARED_CLASS_LOADED_BYTES:
1022     return ClassLoadingService::loaded_shared_class_bytes();
1023 
1024   case JMM_SHARED_CLASS_UNLOADED_BYTES:
1025     return ClassLoadingService::unloaded_shared_class_bytes();
1026 
1027   case JMM_TOTAL_CLASSLOAD_TIME_MS:
1028     return ClassLoader::classloader_time_ms();
1029 
1030   case JMM_VM_GLOBAL_COUNT:
1031     return get_num_flags();
1032 
1033   case JMM_SAFEPOINT_COUNT:
1034     return RuntimeService::safepoint_count();
1035 
1036   case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
1037     return RuntimeService::safepoint_sync_time_ms();
1038 
1039   case JMM_TOTAL_STOPPED_TIME_MS:
1040     return RuntimeService::safepoint_time_ms();
1041 
1042   case JMM_TOTAL_APP_TIME_MS:
1043     return RuntimeService::application_time_ms();
1044 
1045   case JMM_VM_THREAD_COUNT:
1046     return get_vm_thread_count();
1047 
1048   case JMM_CLASS_INIT_TOTAL_COUNT:
1049     return ClassLoader::class_init_count();
1050 
1051   case JMM_CLASS_INIT_TOTAL_TIME_MS:
1052     return ClassLoader::class_init_time_ms();
1053 
1054   case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
1055     return ClassLoader::class_verify_time_ms();
1056 
1057   case JMM_METHOD_DATA_SIZE_BYTES:
1058     return ClassLoadingService::class_method_data_size();
1059 
1060   case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
1061     return os::physical_memory();
1062 
1063   default:
1064     return -1;
1065   }
1066 }
1067 
1068 
1069 // Returns the long value of a given attribute.
1070 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
1071   if (obj == NULL) {
1072     return get_long_attribute(att);
1073   } else {
1074     GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
1075     if (mgr != NULL) {
1076       return get_gc_attribute(mgr, att);
1077     }
1078   }
1079   return -1;
1080 JVM_END
1081 
1082 // Gets the value of all attributes specified in the given array
1083 // and sets the value in the result array.
1084 // Returns the number of attributes found.
1085 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
1086                                       jobject obj,
1087                                       jmmLongAttribute* atts,
1088                                       jint count,
1089                                       jlong* result))
1090 
1091   int num_atts = 0;
1092   if (obj == NULL) {
1093     for (int i = 0; i < count; i++) {
1094       result[i] = get_long_attribute(atts[i]);
1095       if (result[i] != -1) {
1096         num_atts++;
1097       }
1098     }
1099   } else {
1100     GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
1101     for (int i = 0; i < count; i++) {
1102       result[i] = get_gc_attribute(mgr, atts[i]);
1103       if (result[i] != -1) {
1104         num_atts++;
1105       }
1106     }
1107   }
1108   return num_atts;
1109 JVM_END
1110 
1111 // Helper function to do thread dump for a specific list of threads
1112 static void do_thread_dump(ThreadDumpResult* dump_result,
1113                            typeArrayHandle ids_ah,  // array of thread ID (long[])
1114                            int num_threads,
1115                            int max_depth,
1116                            bool with_locked_monitors,
1117                            bool with_locked_synchronizers,
1118                            TRAPS) {
1119 
1120   // First get an array of threadObj handles.
1121   // A JavaThread may terminate before we get the stack trace.
1122   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1123   {
1124     MutexLockerEx ml(Threads_lock);
1125     for (int i = 0; i < num_threads; i++) {
1126       jlong tid = ids_ah->long_at(i);
1127       JavaThread* jt = find_java_thread_from_id(tid);
1128       oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1129       instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1130       thread_handle_array->append(threadObj_h);
1131     }
1132   }
1133 
1134   // Obtain thread dumps and thread snapshot information
1135   VM_ThreadDump op(dump_result,
1136                    thread_handle_array,
1137                    num_threads,
1138                    max_depth, /* stack depth */
1139                    with_locked_monitors,
1140                    with_locked_synchronizers);
1141   VMThread::execute(&op);
1142 }
1143 
1144 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1145 // for the thread ID specified in the corresponding entry in
1146 // the given array of thread IDs; or NULL if the thread does not exist
1147 // or has terminated.
1148 //
1149 // Input parameters:
1150 //   ids       - array of thread IDs
1151 //   maxDepth  - the maximum depth of stack traces to be dumped:
1152 //               maxDepth == -1 requests to dump entire stack trace.
1153 //               maxDepth == 0  requests no stack trace.
1154 //   infoArray - array of ThreadInfo objects
1155 //
1156 // QQQ - Why does this method return a value instead of void?
1157 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1158   // Check if threads is null
1159   if (ids == NULL || infoArray == NULL) {
1160     THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1161   }
1162 
1163   if (maxDepth < -1) {
1164     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1165                "Invalid maxDepth", -1);
1166   }
1167 
1168   ResourceMark rm(THREAD);
1169   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1170   typeArrayHandle ids_ah(THREAD, ta);
1171 
1172   oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1173   objArrayOop oa = objArrayOop(infoArray_obj);
1174   objArrayHandle infoArray_h(THREAD, oa);
1175 
1176   // validate the thread id array
1177   validate_thread_id_array(ids_ah, CHECK_0);
1178 
1179   // validate the ThreadInfo[] parameters
1180   validate_thread_info_array(infoArray_h, CHECK_0);
1181 
1182   // infoArray must be of the same length as the given array of thread IDs
1183   int num_threads = ids_ah->length();
1184   if (num_threads != infoArray_h->length()) {
1185     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1186                "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1187   }
1188 
1189   if (JDK_Version::is_gte_jdk16x_version()) {
1190     // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1191     java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1192   }
1193 
1194   // Must use ThreadDumpResult to store the ThreadSnapshot.
1195   // GC may occur after the thread snapshots are taken but before
1196   // this function returns. The threadObj and other oops kept
1197   // in the ThreadSnapshot are marked and adjusted during GC.
1198   ThreadDumpResult dump_result(num_threads);
1199 
1200   if (maxDepth == 0) {
1201     // no stack trace dumped - do not need to stop the world
1202     {
1203       MutexLockerEx ml(Threads_lock);
1204       for (int i = 0; i < num_threads; i++) {
1205         jlong tid = ids_ah->long_at(i);
1206         JavaThread* jt = find_java_thread_from_id(tid);
1207         ThreadSnapshot* ts;
1208         if (jt == NULL) {
1209           // if the thread does not exist or now it is terminated,
1210           // create dummy snapshot
1211           ts = new ThreadSnapshot();
1212         } else {
1213           ts = new ThreadSnapshot(jt);
1214         }
1215         dump_result.add_thread_snapshot(ts);
1216       }
1217     }
1218   } else {
1219     // obtain thread dump with the specific list of threads with stack trace
1220     do_thread_dump(&dump_result,
1221                    ids_ah,
1222                    num_threads,
1223                    maxDepth,
1224                    false, /* no locked monitor */
1225                    false, /* no locked synchronizers */
1226                    CHECK_0);
1227   }
1228 
1229   int num_snapshots = dump_result.num_snapshots();
1230   assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1231   int index = 0;
1232   for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1233     // For each thread, create an java/lang/management/ThreadInfo object
1234     // and fill with the thread information
1235 
1236     if (ts->threadObj() == NULL) {
1237      // if the thread does not exist or now it is terminated, set threadinfo to NULL
1238       infoArray_h->obj_at_put(index, NULL);
1239       continue;
1240     }
1241 
1242     // Create java.lang.management.ThreadInfo object
1243     instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1244     infoArray_h->obj_at_put(index, info_obj);
1245   }
1246   return 0;
1247 JVM_END
1248 
1249 // Dump thread info for the specified threads.
1250 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1251 // for the thread ID specified in the corresponding entry in
1252 // the given array of thread IDs; or NULL if the thread does not exist
1253 // or has terminated.
1254 //
1255 // Input parameter:
1256 //    ids - array of thread IDs; NULL indicates all live threads
1257 //    locked_monitors - if true, dump locked object monitors
1258 //    locked_synchronizers - if true, dump locked JSR-166 synchronizers
1259 //
1260 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers))
1261   ResourceMark rm(THREAD);
1262 
1263   if (JDK_Version::is_gte_jdk16x_version()) {
1264     // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1265     java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1266   }
1267 
1268   typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1269   int num_threads = (ta != NULL ? ta->length() : 0);
1270   typeArrayHandle ids_ah(THREAD, ta);
1271 
1272   ThreadDumpResult dump_result(num_threads);  // can safepoint
1273 
1274   if (ids_ah() != NULL) {
1275 
1276     // validate the thread id array
1277     validate_thread_id_array(ids_ah, CHECK_NULL);
1278 
1279     // obtain thread dump of a specific list of threads
1280     do_thread_dump(&dump_result,
1281                    ids_ah,
1282                    num_threads,
1283                    -1, /* entire stack */
1284                    (locked_monitors ? true : false),      /* with locked monitors */
1285                    (locked_synchronizers ? true : false), /* with locked synchronizers */
1286                    CHECK_NULL);
1287   } else {
1288     // obtain thread dump of all threads
1289     VM_ThreadDump op(&dump_result,
1290                      -1, /* entire stack */
1291                      (locked_monitors ? true : false),     /* with locked monitors */
1292                      (locked_synchronizers ? true : false) /* with locked synchronizers */);
1293     VMThread::execute(&op);
1294   }
1295 
1296   int num_snapshots = dump_result.num_snapshots();
1297 
1298   // create the result ThreadInfo[] object
1299   klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1300   instanceKlassHandle ik (THREAD, k);
1301   objArrayOop r = oopFactory::new_objArray(ik(), num_snapshots, CHECK_NULL);
1302   objArrayHandle result_h(THREAD, r);
1303 
1304   int index = 0;
1305   for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1306     if (ts->threadObj() == NULL) {
1307      // if the thread does not exist or now it is terminated, set threadinfo to NULL
1308       result_h->obj_at_put(index, NULL);
1309       continue;
1310     }
1311 
1312     ThreadStackTrace* stacktrace = ts->get_stack_trace();
1313     assert(stacktrace != NULL, "Must have a stack trace dumped");
1314 
1315     // Create Object[] filled with locked monitors
1316     // Create int[] filled with the stack depth where a monitor was locked
1317     int num_frames = stacktrace->get_stack_depth();
1318     int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1319 
1320     // Count the total number of locked monitors
1321     for (int i = 0; i < num_frames; i++) {
1322       StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1323       num_locked_monitors += frame->num_locked_monitors();
1324     }
1325 
1326     objArrayHandle monitors_array;
1327     typeArrayHandle depths_array;
1328     objArrayHandle synchronizers_array;
1329 
1330     if (locked_monitors) {
1331       // Constructs Object[] and int[] to contain the object monitor and the stack depth
1332       // where the thread locked it
1333       objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1334       objArrayHandle mh(THREAD, array);
1335       monitors_array = mh;
1336 
1337       typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1338       typeArrayHandle dh(THREAD, tarray);
1339       depths_array = dh;
1340 
1341       int count = 0;
1342       int j = 0;
1343       for (int depth = 0; depth < num_frames; depth++) {
1344         StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1345         int len = frame->num_locked_monitors();
1346         GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1347         for (j = 0; j < len; j++) {
1348           oop monitor = locked_monitors->at(j);
1349           assert(monitor != NULL && monitor->is_instance(), "must be a Java object");
1350           monitors_array->obj_at_put(count, monitor);
1351           depths_array->int_at_put(count, depth);
1352           count++;
1353         }
1354       }
1355 
1356       GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1357       for (j = 0; j < jni_locked_monitors->length(); j++) {
1358         oop object = jni_locked_monitors->at(j);
1359         assert(object != NULL && object->is_instance(), "must be a Java object");
1360         monitors_array->obj_at_put(count, object);
1361         // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1362         depths_array->int_at_put(count, -1);
1363         count++;
1364       }
1365       assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1366     }
1367 
1368     if (locked_synchronizers) {
1369       // Create Object[] filled with locked JSR-166 synchronizers
1370       assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1371       ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1372       GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1373       int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1374 
1375       objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1376       objArrayHandle sh(THREAD, array);
1377       synchronizers_array = sh;
1378 
1379       for (int k = 0; k < num_locked_synchronizers; k++) {
1380         synchronizers_array->obj_at_put(k, locks->at(k));
1381       }
1382     }
1383 
1384     // Create java.lang.management.ThreadInfo object
1385     instanceOop info_obj = Management::create_thread_info_instance(ts,
1386                                                                    monitors_array,
1387                                                                    depths_array,
1388                                                                    synchronizers_array,
1389                                                                    CHECK_NULL);
1390     result_h->obj_at_put(index, info_obj);
1391   }
1392 
1393   return (jobjectArray) JNIHandles::make_local(env, result_h());
1394 JVM_END
1395 
1396 // Returns an array of Class objects.
1397 JVM_ENTRY(jobjectArray, jmm_GetLoadedClasses(JNIEnv *env))
1398   ResourceMark rm(THREAD);
1399 
1400   LoadedClassesEnumerator lce(THREAD);  // Pass current Thread as parameter
1401 
1402   int num_classes = lce.num_loaded_classes();
1403   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), num_classes, CHECK_0);
1404   objArrayHandle classes_ah(THREAD, r);
1405 
1406   for (int i = 0; i < num_classes; i++) {
1407     KlassHandle kh = lce.get_klass(i);
1408     oop mirror = Klass::cast(kh())->java_mirror();
1409     classes_ah->obj_at_put(i, mirror);
1410   }
1411 
1412   return (jobjectArray) JNIHandles::make_local(env, classes_ah());
1413 JVM_END
1414 
1415 // Reset statistic.  Return true if the requested statistic is reset.
1416 // Otherwise, return false.
1417 //
1418 // Input parameters:
1419 //  obj  - specify which instance the statistic associated with to be reset
1420 //         For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1421 //         For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1422 //  type - the type of statistic to be reset
1423 //
1424 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1425   ResourceMark rm(THREAD);
1426 
1427   switch (type) {
1428     case JMM_STAT_PEAK_THREAD_COUNT:
1429       ThreadService::reset_peak_thread_count();
1430       return true;
1431 
1432     case JMM_STAT_THREAD_CONTENTION_COUNT:
1433     case JMM_STAT_THREAD_CONTENTION_TIME: {
1434       jlong tid = obj.j;
1435       if (tid < 0) {
1436         THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1437       }
1438 
1439       // Look for the JavaThread of this given tid
1440       MutexLockerEx ml(Threads_lock);
1441       if (tid == 0) {
1442         // reset contention statistics for all threads if tid == 0
1443         for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) {
1444           if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1445             ThreadService::reset_contention_count_stat(java_thread);
1446           } else {
1447             ThreadService::reset_contention_time_stat(java_thread);
1448           }
1449         }
1450       } else {
1451         // reset contention statistics for a given thread
1452         JavaThread* java_thread = find_java_thread_from_id(tid);
1453         if (java_thread == NULL) {
1454           return false;
1455         }
1456 
1457         if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1458           ThreadService::reset_contention_count_stat(java_thread);
1459         } else {
1460           ThreadService::reset_contention_time_stat(java_thread);
1461         }
1462       }
1463       return true;
1464       break;
1465     }
1466     case JMM_STAT_PEAK_POOL_USAGE: {
1467       jobject o = obj.l;
1468       if (o == NULL) {
1469         THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1470       }
1471 
1472       oop pool_obj = JNIHandles::resolve(o);
1473       assert(pool_obj->is_instance(), "Should be an instanceOop");
1474       instanceHandle ph(THREAD, (instanceOop) pool_obj);
1475 
1476       MemoryPool* pool = MemoryService::get_memory_pool(ph);
1477       if (pool != NULL) {
1478         pool->reset_peak_memory_usage();
1479         return true;
1480       }
1481       break;
1482     }
1483     case JMM_STAT_GC_STAT: {
1484       jobject o = obj.l;
1485       if (o == NULL) {
1486         THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1487       }
1488 
1489       GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1490       if (mgr != NULL) {
1491         mgr->reset_gc_stat();
1492         return true;
1493       }
1494       break;
1495     }
1496     default:
1497       assert(0, "Unknown Statistic Type");
1498   }
1499   return false;
1500 JVM_END
1501 
1502 // Returns the fast estimate of CPU time consumed by
1503 // a given thread (in nanoseconds).
1504 // If thread_id == 0, return CPU time for the current thread.
1505 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1506   if (!os::is_thread_cpu_time_supported()) {
1507     return -1;
1508   }
1509 
1510   if (thread_id < 0) {
1511     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1512                "Invalid thread ID", -1);
1513   }
1514 
1515   JavaThread* java_thread = NULL;
1516   if (thread_id == 0) {
1517     // current thread
1518     return os::current_thread_cpu_time();
1519   } else {
1520     MutexLockerEx ml(Threads_lock);
1521     java_thread = find_java_thread_from_id(thread_id);
1522     if (java_thread != NULL) {
1523       return os::thread_cpu_time((Thread*) java_thread);
1524     }
1525   }
1526   return -1;
1527 JVM_END
1528 
1529 // Returns the CPU time consumed by a given thread (in nanoseconds).
1530 // If thread_id == 0, CPU time for the current thread is returned.
1531 // If user_sys_cpu_time = true, user level and system CPU time of
1532 // a given thread is returned; otherwise, only user level CPU time
1533 // is returned.
1534 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
1535   if (!os::is_thread_cpu_time_supported()) {
1536     return -1;
1537   }
1538 
1539   if (thread_id < 0) {
1540     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1541                "Invalid thread ID", -1);
1542   }
1543 
1544   JavaThread* java_thread = NULL;
1545   if (thread_id == 0) {
1546     // current thread
1547     return os::current_thread_cpu_time(user_sys_cpu_time != 0);
1548   } else {
1549     MutexLockerEx ml(Threads_lock);
1550     java_thread = find_java_thread_from_id(thread_id);
1551     if (java_thread != NULL) {
1552       return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
1553     }
1554   }
1555   return -1;
1556 JVM_END
1557 
1558 // Gets an array containing the CPU times consumed by a set of threads
1559 // (in nanoseconds).  Each element of the array is the CPU time for the
1560 // thread ID specified in the corresponding entry in the given array
1561 // of thread IDs; or -1 if the thread does not exist or has terminated.
1562 // If user_sys_cpu_time = true, the sum of user level and system CPU time
1563 // for the given thread is returned; otherwise, only user level CPU time
1564 // is returned.
1565 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
1566                                               jlongArray timeArray,
1567                                               jboolean user_sys_cpu_time))
1568   // Check if threads is null
1569   if (ids == NULL || timeArray == NULL) {
1570     THROW(vmSymbols::java_lang_NullPointerException());
1571   }
1572 
1573   ResourceMark rm(THREAD);
1574   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1575   typeArrayHandle ids_ah(THREAD, ta);
1576 
1577   typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
1578   typeArrayHandle timeArray_h(THREAD, tia);
1579 
1580   // validate the thread id array
1581   validate_thread_id_array(ids_ah, CHECK);
1582 
1583   // timeArray must be of the same length as the given array of thread IDs
1584   int num_threads = ids_ah->length();
1585   if (num_threads != timeArray_h->length()) {
1586     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1587               "The length of the given long array does not match the length of "
1588               "the given array of thread IDs");
1589   }
1590 
1591   MutexLockerEx ml(Threads_lock);
1592   for (int i = 0; i < num_threads; i++) {
1593     JavaThread* java_thread = find_java_thread_from_id(ids_ah->long_at(i));
1594     if (java_thread != NULL) {
1595       timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
1596                                                       user_sys_cpu_time != 0));
1597     }
1598   }
1599 JVM_END
1600 
1601 // Returns a String array of all VM global flag names
1602 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1603   // last flag entry is always NULL, so subtract 1
1604   int nFlags = (int) Flag::numFlags - 1;
1605   // allocate a temp array
1606   objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1607                                            nFlags, CHECK_0);
1608   objArrayHandle flags_ah(THREAD, r);
1609   int num_entries = 0;
1610   for (int i = 0; i < nFlags; i++) {
1611     Flag* flag = &Flag::flags[i];
1612     // Exclude the locked (experimental, diagnostic) flags
1613     if (flag->is_unlocked() || flag->is_unlocker()) {
1614       Handle s = java_lang_String::create_from_str(flag->name, CHECK_0);
1615       flags_ah->obj_at_put(num_entries, s());
1616       num_entries++;
1617     }
1618   }
1619 
1620   if (num_entries < nFlags) {
1621     // Return array of right length
1622     objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1623     for(int i = 0; i < num_entries; i++) {
1624       res->obj_at_put(i, flags_ah->obj_at(i));
1625     }
1626     return (jobjectArray)JNIHandles::make_local(env, res);
1627   }
1628 
1629   return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1630 JVM_END
1631 
1632 // Utility function used by jmm_GetVMGlobals.  Returns false if flag type
1633 // can't be determined, true otherwise.  If false is returned, then *global
1634 // will be incomplete and invalid.
1635 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
1636   Handle flag_name;
1637   if (name() == NULL) {
1638     flag_name = java_lang_String::create_from_str(flag->name, CHECK_false);
1639   } else {
1640     flag_name = name;
1641   }
1642   global->name = (jstring)JNIHandles::make_local(env, flag_name());
1643 
1644   if (flag->is_bool()) {
1645     global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1646     global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1647   } else if (flag->is_intx()) {
1648     global->value.j = (jlong)flag->get_intx();
1649     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1650   } else if (flag->is_uintx()) {
1651     global->value.j = (jlong)flag->get_uintx();
1652     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1653   } else if (flag->is_uint64_t()) {
1654     global->value.j = (jlong)flag->get_uint64_t();
1655     global->type = JMM_VMGLOBAL_TYPE_JLONG;
1656   } else if (flag->is_ccstr()) {
1657     Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1658     global->value.l = (jobject)JNIHandles::make_local(env, str());
1659     global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1660   } else {
1661     global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1662     return false;
1663   }
1664 
1665   global->writeable = flag->is_writeable();
1666   global->external = flag->is_external();
1667   switch (flag->origin) {
1668     case DEFAULT:
1669       global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1670       break;
1671     case COMMAND_LINE:
1672       global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1673       break;
1674     case ENVIRON_VAR:
1675       global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1676       break;
1677     case CONFIG_FILE:
1678       global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1679       break;
1680     case MANAGEMENT:
1681       global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1682       break;
1683     case ERGONOMIC:
1684       global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1685       break;
1686     default:
1687       global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1688   }
1689 
1690   return true;
1691 }
1692 
1693 // Fill globals array of count length with jmmVMGlobal entries
1694 // specified by names. If names == NULL, fill globals array
1695 // with all Flags. Return value is number of entries
1696 // created in globals.
1697 // If a Flag with a given name in an array element does not
1698 // exist, globals[i].name will be set to NULL.
1699 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1700                                  jobjectArray names,
1701                                  jmmVMGlobal *globals,
1702                                  jint count))
1703 
1704 
1705   if (globals == NULL) {
1706     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1707   }
1708 
1709   ResourceMark rm(THREAD);
1710 
1711   if (names != NULL) {
1712     // return the requested globals
1713     objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1714     objArrayHandle names_ah(THREAD, ta);
1715     // Make sure we have a String array
1716     klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass();
1717     if (element_klass != SystemDictionary::String_klass()) {
1718       THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1719                  "Array element type is not String class", 0);
1720     }
1721 
1722     int names_length = names_ah->length();
1723     int num_entries = 0;
1724     for (int i = 0; i < names_length && i < count; i++) {
1725       oop s = names_ah->obj_at(i);
1726       if (s == NULL) {
1727         THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1728       }
1729 
1730       Handle sh(THREAD, s);
1731       char* str = java_lang_String::as_utf8_string(s);
1732       Flag* flag = Flag::find_flag(str, strlen(str));
1733       if (flag != NULL &&
1734           add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1735         num_entries++;
1736       } else {
1737         globals[i].name = NULL;
1738       }
1739     }
1740     return num_entries;
1741   } else {
1742     // return all globals if names == NULL
1743 
1744     // last flag entry is always NULL, so subtract 1
1745     int nFlags = (int) Flag::numFlags - 1;
1746     Handle null_h;
1747     int num_entries = 0;
1748     for (int i = 0; i < nFlags && num_entries < count;  i++) {
1749       Flag* flag = &Flag::flags[i];
1750       // Exclude the locked (diagnostic, experimental) flags
1751       if ((flag->is_unlocked() || flag->is_unlocker()) &&
1752           add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1753         num_entries++;
1754       }
1755     }
1756     return num_entries;
1757   }
1758 JVM_END
1759 
1760 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1761   ResourceMark rm(THREAD);
1762 
1763   oop fn = JNIHandles::resolve_external_guard(flag_name);
1764   if (fn == NULL) {
1765     THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1766               "The flag name cannot be null.");
1767   }
1768   char* name = java_lang_String::as_utf8_string(fn);
1769   Flag* flag = Flag::find_flag(name, strlen(name));
1770   if (flag == NULL) {
1771     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1772               "Flag does not exist.");
1773   }
1774   if (!flag->is_writeable()) {
1775     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1776               "This flag is not writeable.");
1777   }
1778 
1779   bool succeed;
1780   if (flag->is_bool()) {
1781     bool bvalue = (new_value.z == JNI_TRUE ? true : false);
1782     succeed = CommandLineFlags::boolAtPut(name, &bvalue, MANAGEMENT);
1783   } else if (flag->is_intx()) {
1784     intx ivalue = (intx)new_value.j;
1785     succeed = CommandLineFlags::intxAtPut(name, &ivalue, MANAGEMENT);
1786   } else if (flag->is_uintx()) {
1787     uintx uvalue = (uintx)new_value.j;
1788     succeed = CommandLineFlags::uintxAtPut(name, &uvalue, MANAGEMENT);
1789   } else if (flag->is_uint64_t()) {
1790     uint64_t uvalue = (uint64_t)new_value.j;
1791     succeed = CommandLineFlags::uint64_tAtPut(name, &uvalue, MANAGEMENT);
1792   } else if (flag->is_ccstr()) {
1793     oop str = JNIHandles::resolve_external_guard(new_value.l);
1794     if (str == NULL) {
1795       THROW(vmSymbols::java_lang_NullPointerException());
1796     }
1797     ccstr svalue = java_lang_String::as_utf8_string(str);
1798     succeed = CommandLineFlags::ccstrAtPut(name, &svalue, MANAGEMENT);
1799   }
1800   assert(succeed, "Setting flag should succeed");
1801 JVM_END
1802 
1803 class ThreadTimesClosure: public ThreadClosure {
1804  private:
1805   objArrayOop _names;
1806   typeArrayOop _times;
1807   int _names_len;
1808   int _times_len;
1809   int _count;
1810 
1811  public:
1812   ThreadTimesClosure(objArrayOop names, typeArrayOop times);
1813   virtual void do_thread(Thread* thread);
1814   int count() { return _count; }
1815 };
1816 
1817 ThreadTimesClosure::ThreadTimesClosure(objArrayOop names,
1818                                        typeArrayOop times) {
1819   assert(names != NULL, "names was NULL");
1820   assert(times != NULL, "times was NULL");
1821   _names = names;
1822   _names_len = names->length();
1823   _times = times;
1824   _times_len = times->length();
1825   _count = 0;
1826 }
1827 
1828 void ThreadTimesClosure::do_thread(Thread* thread) {
1829   Handle s;
1830   assert(thread != NULL, "thread was NULL");
1831 
1832   // exclude externally visible JavaThreads
1833   if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1834     return;
1835   }
1836 
1837   if (_count >= _names_len || _count >= _times_len) {
1838     // skip if the result array is not big enough
1839     return;
1840   }
1841 
1842   EXCEPTION_MARK;
1843 
1844   assert(thread->name() != NULL, "All threads should have a name");
1845   s = java_lang_String::create_from_str(thread->name(), CHECK);
1846   _names->obj_at_put(_count, s());
1847 
1848   _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1849                         os::thread_cpu_time(thread) : -1);
1850   _count++;
1851 }
1852 
1853 // Fills names with VM internal thread names and times with the corresponding
1854 // CPU times.  If names or times is NULL, a NullPointerException is thrown.
1855 // If the element type of names is not String, an IllegalArgumentException is
1856 // thrown.
1857 // If an array is not large enough to hold all the entries, only the entries
1858 // that fit will be returned.  Return value is the number of VM internal
1859 // threads entries.
1860 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1861                                            jobjectArray names,
1862                                            jlongArray times))
1863   if (names == NULL || times == NULL) {
1864      THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1865   }
1866   objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1867   objArrayHandle names_ah(THREAD, na);
1868 
1869   // Make sure we have a String array
1870   klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass();
1871   if (element_klass != SystemDictionary::String_klass()) {
1872     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1873                "Array element type is not String class", 0);
1874   }
1875 
1876   typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1877   typeArrayHandle times_ah(THREAD, ta);
1878 
1879   ThreadTimesClosure ttc(names_ah(), times_ah());
1880   {
1881     MutexLockerEx ml(Threads_lock);
1882     Threads::threads_do(&ttc);
1883   }
1884 
1885   return ttc.count();
1886 JVM_END
1887 
1888 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1889   ResourceMark rm(THREAD);
1890 
1891   VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1892   VMThread::execute(&op);
1893 
1894   DeadlockCycle* deadlocks = op.result();
1895   if (deadlocks == NULL) {
1896     // no deadlock found and return
1897     return Handle();
1898   }
1899 
1900   int num_threads = 0;
1901   DeadlockCycle* cycle;
1902   for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1903     num_threads += cycle->num_threads();
1904   }
1905 
1906   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1907   objArrayHandle threads_ah(THREAD, r);
1908 
1909   int index = 0;
1910   for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1911     GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1912     int len = deadlock_threads->length();
1913     for (int i = 0; i < len; i++) {
1914       threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1915       index++;
1916     }
1917   }
1918   return threads_ah;
1919 }
1920 
1921 // Finds cycles of threads that are deadlocked involved in object monitors
1922 // and JSR-166 synchronizers.
1923 // Returns an array of Thread objects which are in deadlock, if any.
1924 // Otherwise, returns NULL.
1925 //
1926 // Input parameter:
1927 //    object_monitors_only - if true, only check object monitors
1928 //
1929 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1930   Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1931   return (jobjectArray) JNIHandles::make_local(env, result());
1932 JVM_END
1933 
1934 // Finds cycles of threads that are deadlocked on monitor locks
1935 // Returns an array of Thread objects which are in deadlock, if any.
1936 // Otherwise, returns NULL.
1937 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1938   Handle result = find_deadlocks(true, CHECK_0);
1939   return (jobjectArray) JNIHandles::make_local(env, result());
1940 JVM_END
1941 
1942 // Gets the information about GC extension attributes including
1943 // the name of the attribute, its type, and a short description.
1944 //
1945 // Input parameters:
1946 //   mgr   - GC memory manager
1947 //   info  - caller allocated array of jmmExtAttributeInfo
1948 //   count - number of elements of the info array
1949 //
1950 // Returns the number of GC extension attributes filled in the info array; or
1951 // -1 if info is not big enough
1952 //
1953 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1954   // All GC memory managers have 1 attribute (number of GC threads)
1955   if (count == 0) {
1956     return 0;
1957   }
1958 
1959   if (info == NULL) {
1960    THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1961   }
1962 
1963   info[0].name = "GcThreadCount";
1964   info[0].type = 'I';
1965   info[0].description = "Number of GC threads";
1966   return 1;
1967 JVM_END
1968 
1969 // verify the given array is an array of java/lang/management/MemoryUsage objects
1970 // of a given length and return the objArrayOop
1971 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1972   if (array == NULL) {
1973     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1974   }
1975 
1976   objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1977   objArrayHandle array_h(THREAD, oa);
1978 
1979   // array must be of the given length
1980   if (length != array_h->length()) {
1981     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1982                "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1983   }
1984 
1985   // check if the element of array is of type MemoryUsage class
1986   klassOop usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1987   klassOop element_klass = objArrayKlass::cast(array_h->klass())->element_klass();
1988   if (element_klass != usage_klass) {
1989     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1990                "The element type is not MemoryUsage class", 0);
1991   }
1992 
1993   return array_h();
1994 }
1995 
1996 // Gets the statistics of the last GC of a given GC memory manager.
1997 // Input parameters:
1998 //   obj     - GarbageCollectorMXBean object
1999 //   gc_stat - caller allocated jmmGCStat where:
2000 //     a. before_gc_usage - array of MemoryUsage objects
2001 //     b. after_gc_usage  - array of MemoryUsage objects
2002 //     c. gc_ext_attributes_values_size is set to the
2003 //        gc_ext_attribute_values array allocated
2004 //     d. gc_ext_attribute_values is a caller allocated array of jvalue.
2005 //
2006 // On return,
2007 //   gc_index == 0 indicates no GC statistics available
2008 //
2009 //   before_gc_usage and after_gc_usage - filled with per memory pool
2010 //      before and after GC usage in the same order as the memory pools
2011 //      returned by GetMemoryPools for a given GC memory manager.
2012 //   num_gc_ext_attributes indicates the number of elements in
2013 //      the gc_ext_attribute_values array is filled; or
2014 //      -1 if the gc_ext_attributes_values array is not big enough
2015 //
2016 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
2017   ResourceMark rm(THREAD);
2018 
2019   if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
2020     THROW(vmSymbols::java_lang_NullPointerException());
2021   }
2022 
2023   // Get the GCMemoryManager
2024   GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
2025 
2026   // Make a copy of the last GC statistics
2027   // GC may occur while constructing the last GC information
2028   int num_pools = MemoryService::num_memory_pools();
2029   GCStatInfo* stat = new GCStatInfo(num_pools);
2030   if (mgr->get_last_gc_stat(stat) == 0) {
2031     gc_stat->gc_index = 0;
2032     return;
2033   }
2034 
2035   gc_stat->gc_index = stat->gc_index();
2036   gc_stat->start_time = Management::ticks_to_ms(stat->start_time());
2037   gc_stat->end_time = Management::ticks_to_ms(stat->end_time());
2038 
2039   // Current implementation does not have GC extension attributes
2040   gc_stat->num_gc_ext_attributes = 0;
2041 
2042   // Fill the arrays of MemoryUsage objects with before and after GC
2043   // per pool memory usage
2044   objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
2045                                              num_pools,
2046                                              CHECK);
2047   objArrayHandle usage_before_gc_ah(THREAD, bu);
2048 
2049   objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
2050                                              num_pools,
2051                                              CHECK);
2052   objArrayHandle usage_after_gc_ah(THREAD, au);
2053 
2054   for (int i = 0; i < num_pools; i++) {
2055     Handle before_usage = MemoryService::create_MemoryUsage_obj(stat->before_gc_usage_for_pool(i), CHECK);
2056     Handle after_usage;
2057 
2058     MemoryUsage u = stat->after_gc_usage_for_pool(i);
2059     if (u.max_size() == 0 && u.used() > 0) {
2060       // If max size == 0, this pool is a survivor space.
2061       // Set max size = -1 since the pools will be swapped after GC.
2062       MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
2063       after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
2064     } else {
2065       after_usage = MemoryService::create_MemoryUsage_obj(stat->after_gc_usage_for_pool(i), CHECK);
2066     }
2067     usage_before_gc_ah->obj_at_put(i, before_usage());
2068     usage_after_gc_ah->obj_at_put(i, after_usage());
2069   }
2070 
2071   if (gc_stat->gc_ext_attribute_values_size > 0) {
2072     // Current implementation only has 1 attribute (number of GC threads)
2073     // The type is 'I'
2074     gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
2075   }
2076 JVM_END
2077 
2078 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
2079   ResourceMark rm(THREAD);
2080   // Get the GCMemoryManager
2081   GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
2082   mgr->set_notification_enabled(enabled?true:false);
2083 JVM_END
2084 
2085 // Dump heap - Returns 0 if succeeds.
2086 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
2087 #ifndef SERVICES_KERNEL
2088   ResourceMark rm(THREAD);
2089   oop on = JNIHandles::resolve_external_guard(outputfile);
2090   if (on == NULL) {
2091     THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
2092                "Output file name cannot be null.", -1);
2093   }
2094   char* name = java_lang_String::as_utf8_string(on);
2095   if (name == NULL) {
2096     THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
2097                "Output file name cannot be null.", -1);
2098   }
2099   HeapDumper dumper(live ? true : false);
2100   if (dumper.dump(name) != 0) {
2101     const char* errmsg = dumper.error_as_C_string();
2102     THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
2103   }
2104   return 0;
2105 #else  // SERVICES_KERNEL
2106   return -1;
2107 #endif // SERVICES_KERNEL
2108 JVM_END
2109 






















































































































2110 jlong Management::ticks_to_ms(jlong ticks) {
2111   assert(os::elapsed_frequency() > 0, "Must be non-zero");
2112   return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2113                  * (double)1000.0);
2114 }
2115 
2116 const struct jmmInterface_1_ jmm_interface = {
2117   NULL,
2118   NULL,
2119   jmm_GetVersion,
2120   jmm_GetOptionalSupport,
2121   jmm_GetInputArguments,
2122   jmm_GetThreadInfo,
2123   jmm_GetInputArgumentArray,
2124   jmm_GetMemoryPools,
2125   jmm_GetMemoryManagers,
2126   jmm_GetMemoryPoolUsage,
2127   jmm_GetPeakMemoryPoolUsage,
2128   jmm_GetThreadAllocatedMemory,
2129   jmm_GetMemoryUsage,
2130   jmm_GetLongAttribute,
2131   jmm_GetBoolAttribute,
2132   jmm_SetBoolAttribute,
2133   jmm_GetLongAttributes,
2134   jmm_FindMonitorDeadlockedThreads,
2135   jmm_GetThreadCpuTime,
2136   jmm_GetVMGlobalNames,
2137   jmm_GetVMGlobals,
2138   jmm_GetInternalThreadTimes,
2139   jmm_ResetStatistic,
2140   jmm_SetPoolSensor,
2141   jmm_SetPoolThreshold,
2142   jmm_GetPoolCollectionUsage,
2143   jmm_GetGCExtAttributeInfo,
2144   jmm_GetLastGCStat,
2145   jmm_GetThreadCpuTimeWithKind,
2146   jmm_GetThreadCpuTimesWithKind,
2147   jmm_DumpHeap0,
2148   jmm_FindDeadlockedThreads,
2149   jmm_SetVMGlobal,
2150   NULL,
2151   jmm_DumpThreads,
2152   jmm_SetGCNotificationEnabled




2153 };
2154 
2155 void* Management::get_jmm_interface(int version) {
2156   if (version == JMM_VERSION_1_0) {
2157     return (void*) &jmm_interface;
2158   }
2159   return NULL;
2160 }
--- EOF ---