1 /*
2 * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "compiler/compileBroker.hpp"
28 #include "memory/iterator.hpp"
29 #include "memory/oopFactory.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "oops/klass.hpp"
32 #include "oops/objArrayKlass.hpp"
33 #include "oops/objArrayOop.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/globals.hpp"
37 #include "runtime/handles.inline.hpp"
38 #include "runtime/interfaceSupport.hpp"
39 #include "runtime/javaCalls.hpp"
40 #include "runtime/jniHandles.hpp"
41 #include "runtime/os.hpp"
42 #include "runtime/serviceThread.hpp"
43 #include "runtime/thread.inline.hpp"
44 #include "services/classLoadingService.hpp"
45 #include "services/diagnosticCommand.hpp"
46 #include "services/diagnosticFramework.hpp"
47 #include "services/writeableFlags.hpp"
48 #include "services/heapDumper.hpp"
49 #include "services/jmm.h"
50 #include "services/lowMemoryDetector.hpp"
51 #include "services/gcNotifier.hpp"
52 #include "services/nmtDCmd.hpp"
53 #include "services/management.hpp"
54 #include "services/memoryManager.hpp"
55 #include "services/memoryPool.hpp"
56 #include "services/memoryService.hpp"
57 #include "services/runtimeService.hpp"
58 #include "services/threadService.hpp"
59 #include "utilities/macros.hpp"
60
61 PerfVariable* Management::_begin_vm_creation_time = NULL;
62 PerfVariable* Management::_end_vm_creation_time = NULL;
63 PerfVariable* Management::_vm_init_done_time = NULL;
64
65 Klass* Management::_diagnosticCommandImpl_klass = NULL;
66 Klass* Management::_garbageCollectorExtImpl_klass = NULL;
67 Klass* Management::_garbageCollectorMXBean_klass = NULL;
68 Klass* Management::_gcInfo_klass = NULL;
69 Klass* Management::_managementFactoryHelper_klass = NULL;
70 Klass* Management::_memoryManagerMXBean_klass = NULL;
71 Klass* Management::_memoryPoolMXBean_klass = NULL;
72 Klass* Management::_memoryUsage_klass = NULL;
73 Klass* Management::_sensor_klass = NULL;
74 Klass* Management::_threadInfo_klass = NULL;
75
76 jmmOptionalSupport Management::_optional_support = {0};
77 TimeStamp Management::_stamp;
78
79 void management_init() {
80 #if INCLUDE_MANAGEMENT
81 Management::init();
82 ThreadService::init();
83 RuntimeService::init();
84 ClassLoadingService::init();
85 #else
86 ThreadService::init();
87 #endif // INCLUDE_MANAGEMENT
88 }
89
90 #if INCLUDE_MANAGEMENT
91
92 void Management::init() {
93 EXCEPTION_MARK;
94
95 // These counters are for java.lang.management API support.
96 // They are created even if -XX:-UsePerfData is set and in
97 // that case, they will be allocated on C heap.
98
99 _begin_vm_creation_time =
100 PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
101 PerfData::U_None, CHECK);
102
103 _end_vm_creation_time =
104 PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
105 PerfData::U_None, CHECK);
106
107 _vm_init_done_time =
108 PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
109 PerfData::U_None, CHECK);
110
111 // Initialize optional support
112 _optional_support.isLowMemoryDetectionSupported = 1;
113 _optional_support.isCompilationTimeMonitoringSupported = 1;
114 _optional_support.isThreadContentionMonitoringSupported = 1;
115
116 if (os::is_thread_cpu_time_supported()) {
117 _optional_support.isCurrentThreadCpuTimeSupported = 1;
118 _optional_support.isOtherThreadCpuTimeSupported = 1;
119 } else {
120 _optional_support.isCurrentThreadCpuTimeSupported = 0;
121 _optional_support.isOtherThreadCpuTimeSupported = 0;
122 }
123
124 _optional_support.isObjectMonitorUsageSupported = 1;
125 #if INCLUDE_SERVICES
126 // This depends on the heap inspector
127 _optional_support.isSynchronizerUsageSupported = 1;
128 #endif // INCLUDE_SERVICES
129 _optional_support.isThreadAllocatedMemorySupported = 1;
130 _optional_support.isRemoteDiagnosticCommandsSupported = 1;
131
132 // Registration of the diagnostic commands
133 DCmdRegistrant::register_dcmds();
134 DCmdRegistrant::register_dcmds_ext();
135 uint32_t full_export = DCmd_Source_Internal | DCmd_Source_AttachAPI
136 | DCmd_Source_MBean;
137 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(full_export, true, false));
138 }
139
140 void Management::initialize(TRAPS) {
141 // Start the service thread
142 ServiceThread::initialize();
143
144 if (ManagementServer) {
145 ResourceMark rm(THREAD);
146 HandleMark hm(THREAD);
147
148 // Load and initialize the sun.management.Agent class
149 // invoke startAgent method to start the management server
150 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
151 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::sun_management_Agent(),
152 loader,
153 Handle(),
154 THREAD);
155 if (k == NULL) {
156 vm_exit_during_initialization("Management agent initialization failure: "
157 "class sun.management.Agent not found.");
158 }
159 instanceKlassHandle ik (THREAD, k);
160
161 JavaValue result(T_VOID);
162 JavaCalls::call_static(&result,
163 ik,
164 vmSymbols::startAgent_name(),
165 vmSymbols::void_method_signature(),
166 CHECK);
167 }
168 }
169
170 void Management::get_optional_support(jmmOptionalSupport* support) {
171 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
172 }
173
174 Klass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
175 Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
176 instanceKlassHandle ik (THREAD, k);
177 if (ik->should_be_initialized()) {
178 ik->initialize(CHECK_NULL);
179 }
180 // If these classes change to not be owned by the boot loader, they need
181 // to be walked to keep their class loader alive in oops_do.
182 assert(ik->class_loader() == NULL, "need to follow in oops_do");
183 return ik();
184 }
185
186 void Management::record_vm_startup_time(jlong begin, jlong duration) {
187 // if the performance counter is not initialized,
188 // then vm initialization failed; simply return.
189 if (_begin_vm_creation_time == NULL) return;
190
191 _begin_vm_creation_time->set_value(begin);
192 _end_vm_creation_time->set_value(begin + duration);
193 PerfMemory::set_accessible(true);
194 }
195
196 jlong Management::timestamp() {
197 TimeStamp t;
198 t.update();
199 return t.ticks() - _stamp.ticks();
200 }
201
202 void Management::oops_do(OopClosure* f) {
203 MemoryService::oops_do(f);
204 ThreadService::oops_do(f);
205 }
206
207 Klass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {
208 if (_threadInfo_klass == NULL) {
209 _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
210 }
211 return _threadInfo_klass;
212 }
213
214 Klass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {
215 if (_memoryUsage_klass == NULL) {
216 _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
217 }
218 return _memoryUsage_klass;
219 }
220
221 Klass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
222 if (_memoryPoolMXBean_klass == NULL) {
223 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
224 }
225 return _memoryPoolMXBean_klass;
226 }
227
228 Klass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
229 if (_memoryManagerMXBean_klass == NULL) {
230 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
231 }
232 return _memoryManagerMXBean_klass;
233 }
234
235 Klass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
236 if (_garbageCollectorMXBean_klass == NULL) {
237 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
238 }
239 return _garbageCollectorMXBean_klass;
240 }
241
242 Klass* Management::sun_management_Sensor_klass(TRAPS) {
243 if (_sensor_klass == NULL) {
244 _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
245 }
246 return _sensor_klass;
247 }
248
249 Klass* Management::sun_management_ManagementFactoryHelper_klass(TRAPS) {
250 if (_managementFactoryHelper_klass == NULL) {
251 _managementFactoryHelper_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactoryHelper(), CHECK_NULL);
252 }
253 return _managementFactoryHelper_klass;
254 }
255
256 Klass* Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(TRAPS) {
257 if (_garbageCollectorExtImpl_klass == NULL) {
258 _garbageCollectorExtImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_GarbageCollectorExtImpl(), CHECK_NULL);
259 }
260 return _garbageCollectorExtImpl_klass;
261 }
262
263 Klass* Management::com_sun_management_GcInfo_klass(TRAPS) {
264 if (_gcInfo_klass == NULL) {
265 _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
266 }
267 return _gcInfo_klass;
268 }
269
270 Klass* Management::com_sun_management_internal_DiagnosticCommandImpl_klass(TRAPS) {
271 if (_diagnosticCommandImpl_klass == NULL) {
272 _diagnosticCommandImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_DiagnosticCommandImpl(), CHECK_NULL);
273 }
274 return _diagnosticCommandImpl_klass;
275 }
276
277 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
278 Handle snapshot_thread(THREAD, snapshot->threadObj());
279
280 jlong contended_time;
281 jlong waited_time;
282 if (ThreadService::is_thread_monitoring_contention()) {
283 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
284 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
285 } else {
286 // set them to -1 if thread contention monitoring is disabled.
287 contended_time = max_julong;
288 waited_time = max_julong;
289 }
290
291 int thread_status = snapshot->thread_status();
292 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
293 if (snapshot->is_ext_suspended()) {
294 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
295 }
296 if (snapshot->is_in_native()) {
297 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
298 }
299
300 ThreadStackTrace* st = snapshot->get_stack_trace();
301 Handle stacktrace_h;
302 if (st != NULL) {
303 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
304 } else {
305 stacktrace_h = Handle();
306 }
307
308 args->push_oop(snapshot_thread);
309 args->push_int(thread_status);
310 args->push_oop(Handle(THREAD, snapshot->blocker_object()));
311 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
312 args->push_long(snapshot->contended_enter_count());
313 args->push_long(contended_time);
314 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
315 args->push_long(waited_time);
316 args->push_oop(stacktrace_h);
317 }
318
319 // Helper function to construct a ThreadInfo object
320 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
321 Klass* k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
322 instanceKlassHandle ik (THREAD, k);
323
324 JavaValue result(T_VOID);
325 JavaCallArguments args(14);
326
327 // First allocate a ThreadObj object and
328 // push the receiver as the first argument
329 Handle element = ik->allocate_instance_handle(CHECK_NULL);
330 args.push_oop(element);
331
332 // initialize the arguments for the ThreadInfo constructor
333 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
334
335 // Call ThreadInfo constructor with no locked monitors and synchronizers
336 JavaCalls::call_special(&result,
337 ik,
338 vmSymbols::object_initializer_name(),
339 vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
340 &args,
341 CHECK_NULL);
342
343 return (instanceOop) element();
344 }
345
346 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
347 objArrayHandle monitors_array,
348 typeArrayHandle depths_array,
349 objArrayHandle synchronizers_array,
350 TRAPS) {
351 Klass* k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
352 instanceKlassHandle ik (THREAD, k);
353
354 JavaValue result(T_VOID);
355 JavaCallArguments args(17);
356
357 // First allocate a ThreadObj object and
358 // push the receiver as the first argument
359 Handle element = ik->allocate_instance_handle(CHECK_NULL);
360 args.push_oop(element);
361
362 // initialize the arguments for the ThreadInfo constructor
363 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
364
365 // push the locked monitors and synchronizers in the arguments
366 args.push_oop(monitors_array);
367 args.push_oop(depths_array);
368 args.push_oop(synchronizers_array);
369
370 // Call ThreadInfo constructor with locked monitors and synchronizers
371 JavaCalls::call_special(&result,
372 ik,
373 vmSymbols::object_initializer_name(),
374 vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
375 &args,
376 CHECK_NULL);
377
378 return (instanceOop) element();
379 }
380
381
382 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
383 if (mgr == NULL) {
384 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
385 }
386 oop mgr_obj = JNIHandles::resolve(mgr);
387 instanceHandle h(THREAD, (instanceOop) mgr_obj);
388
389 Klass* k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
390 if (!h->is_a(k)) {
391 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
392 "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
393 NULL);
394 }
395
396 MemoryManager* gc = MemoryService::get_memory_manager(h);
397 if (gc == NULL || !gc->is_gc_memory_manager()) {
398 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
399 "Invalid GC memory manager",
400 NULL);
401 }
402 return (GCMemoryManager*) gc;
403 }
404
405 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
406 if (obj == NULL) {
407 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
408 }
409
410 oop pool_obj = JNIHandles::resolve(obj);
411 assert(pool_obj->is_instance(), "Should be an instanceOop");
412 instanceHandle ph(THREAD, (instanceOop) pool_obj);
413
414 return MemoryService::get_memory_pool(ph);
415 }
416
417 #endif // INCLUDE_MANAGEMENT
418
419 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
420 int num_threads = ids_ah->length();
421
422 // Validate input thread IDs
423 int i = 0;
424 for (i = 0; i < num_threads; i++) {
425 jlong tid = ids_ah->long_at(i);
426 if (tid <= 0) {
427 // throw exception if invalid thread id.
428 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
429 "Invalid thread ID entry");
430 }
431 }
432 }
433
434 #if INCLUDE_MANAGEMENT
435
436 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
437 // check if the element of infoArray is of type ThreadInfo class
438 Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
439 Klass* element_klass = ObjArrayKlass::cast(infoArray_h->klass())->element_klass();
440 if (element_klass != threadinfo_klass) {
441 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
442 "infoArray element type is not ThreadInfo class");
443 }
444 }
445
446
447 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
448 if (obj == NULL) {
449 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
450 }
451
452 oop mgr_obj = JNIHandles::resolve(obj);
453 assert(mgr_obj->is_instance(), "Should be an instanceOop");
454 instanceHandle mh(THREAD, (instanceOop) mgr_obj);
455
456 return MemoryService::get_memory_manager(mh);
457 }
458
459 // Returns a version string and sets major and minor version if
460 // the input parameters are non-null.
461 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
462 return JMM_VERSION;
463 JVM_END
464
465 // Gets the list of VM monitoring and management optional supports
466 // Returns 0 if succeeded; otherwise returns non-zero.
467 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
468 if (support == NULL) {
469 return -1;
470 }
471 Management::get_optional_support(support);
472 return 0;
473 JVM_END
474
475 // Returns an array of java/lang/management/MemoryPoolMXBean object
476 // one for each memory pool if obj == null; otherwise returns
477 // an array of memory pools for a given memory manager if
478 // it is a valid memory manager.
479 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
480 ResourceMark rm(THREAD);
481
482 int num_memory_pools;
483 MemoryManager* mgr = NULL;
484 if (obj == NULL) {
485 num_memory_pools = MemoryService::num_memory_pools();
486 } else {
487 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
488 if (mgr == NULL) {
489 return NULL;
490 }
491 num_memory_pools = mgr->num_memory_pools();
492 }
493
494 // Allocate the resulting MemoryPoolMXBean[] object
495 Klass* k = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
496 instanceKlassHandle ik (THREAD, k);
497 objArrayOop r = oopFactory::new_objArray(ik(), num_memory_pools, CHECK_NULL);
498 objArrayHandle poolArray(THREAD, r);
499
500 if (mgr == NULL) {
501 // Get all memory pools
502 for (int i = 0; i < num_memory_pools; i++) {
503 MemoryPool* pool = MemoryService::get_memory_pool(i);
504 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
505 instanceHandle ph(THREAD, p);
506 poolArray->obj_at_put(i, ph());
507 }
508 } else {
509 // Get memory pools managed by a given memory manager
510 for (int i = 0; i < num_memory_pools; i++) {
511 MemoryPool* pool = mgr->get_memory_pool(i);
512 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
513 instanceHandle ph(THREAD, p);
514 poolArray->obj_at_put(i, ph());
515 }
516 }
517 return (jobjectArray) JNIHandles::make_local(env, poolArray());
518 JVM_END
519
520 // Returns an array of java/lang/management/MemoryManagerMXBean object
521 // one for each memory manager if obj == null; otherwise returns
522 // an array of memory managers for a given memory pool if
523 // it is a valid memory pool.
524 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
525 ResourceMark rm(THREAD);
526
527 int num_mgrs;
528 MemoryPool* pool = NULL;
529 if (obj == NULL) {
530 num_mgrs = MemoryService::num_memory_managers();
531 } else {
532 pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
533 if (pool == NULL) {
534 return NULL;
535 }
536 num_mgrs = pool->num_memory_managers();
537 }
538
539 // Allocate the resulting MemoryManagerMXBean[] object
540 Klass* k = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
541 instanceKlassHandle ik (THREAD, k);
542 objArrayOop r = oopFactory::new_objArray(ik(), num_mgrs, CHECK_NULL);
543 objArrayHandle mgrArray(THREAD, r);
544
545 if (pool == NULL) {
546 // Get all memory managers
547 for (int i = 0; i < num_mgrs; i++) {
548 MemoryManager* mgr = MemoryService::get_memory_manager(i);
549 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
550 instanceHandle ph(THREAD, p);
551 mgrArray->obj_at_put(i, ph());
552 }
553 } else {
554 // Get memory managers for a given memory pool
555 for (int i = 0; i < num_mgrs; i++) {
556 MemoryManager* mgr = pool->get_memory_manager(i);
557 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
558 instanceHandle ph(THREAD, p);
559 mgrArray->obj_at_put(i, ph());
560 }
561 }
562 return (jobjectArray) JNIHandles::make_local(env, mgrArray());
563 JVM_END
564
565
566 // Returns a java/lang/management/MemoryUsage object containing the memory usage
567 // of a given memory pool.
568 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
569 ResourceMark rm(THREAD);
570
571 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
572 if (pool != NULL) {
573 MemoryUsage usage = pool->get_memory_usage();
574 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
575 return JNIHandles::make_local(env, h());
576 } else {
577 return NULL;
578 }
579 JVM_END
580
581 // Returns a java/lang/management/MemoryUsage object containing the memory usage
582 // of a given memory pool.
583 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
584 ResourceMark rm(THREAD);
585
586 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
587 if (pool != NULL) {
588 MemoryUsage usage = pool->get_peak_memory_usage();
589 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
590 return JNIHandles::make_local(env, h());
591 } else {
592 return NULL;
593 }
594 JVM_END
595
596 // Returns a java/lang/management/MemoryUsage object containing the memory usage
597 // of a given memory pool after most recent GC.
598 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
599 ResourceMark rm(THREAD);
600
601 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
602 if (pool != NULL && pool->is_collected_pool()) {
603 MemoryUsage usage = pool->get_last_collection_usage();
604 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
605 return JNIHandles::make_local(env, h());
606 } else {
607 return NULL;
608 }
609 JVM_END
610
611 // Sets the memory pool sensor for a threshold type
612 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
613 if (obj == NULL || sensorObj == NULL) {
614 THROW(vmSymbols::java_lang_NullPointerException());
615 }
616
617 Klass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
618 oop s = JNIHandles::resolve(sensorObj);
619 assert(s->is_instance(), "Sensor should be an instanceOop");
620 instanceHandle sensor_h(THREAD, (instanceOop) s);
621 if (!sensor_h->is_a(sensor_klass)) {
622 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
623 "Sensor is not an instance of sun.management.Sensor class");
624 }
625
626 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
627 assert(mpool != NULL, "MemoryPool should exist");
628
629 switch (type) {
630 case JMM_USAGE_THRESHOLD_HIGH:
631 case JMM_USAGE_THRESHOLD_LOW:
632 // have only one sensor for threshold high and low
633 mpool->set_usage_sensor_obj(sensor_h);
634 break;
635 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
636 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
637 // have only one sensor for threshold high and low
638 mpool->set_gc_usage_sensor_obj(sensor_h);
639 break;
640 default:
641 assert(false, "Unrecognized type");
642 }
643
644 JVM_END
645
646
647 // Sets the threshold of a given memory pool.
648 // Returns the previous threshold.
649 //
650 // Input parameters:
651 // pool - the MemoryPoolMXBean object
652 // type - threshold type
653 // threshold - the new threshold (must not be negative)
654 //
655 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
656 if (threshold < 0) {
657 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
658 "Invalid threshold value",
659 -1);
660 }
661
662 if ((size_t)threshold > max_uintx) {
663 stringStream st;
664 st.print("Invalid valid threshold value. Threshold value (" JLONG_FORMAT ") > max value of size_t (" UINTX_FORMAT ")", threshold, max_uintx);
665 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
666 }
667
668 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
669 assert(pool != NULL, "MemoryPool should exist");
670
671 jlong prev = 0;
672 switch (type) {
673 case JMM_USAGE_THRESHOLD_HIGH:
674 if (!pool->usage_threshold()->is_high_threshold_supported()) {
675 return -1;
676 }
677 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
678 break;
679
680 case JMM_USAGE_THRESHOLD_LOW:
681 if (!pool->usage_threshold()->is_low_threshold_supported()) {
682 return -1;
683 }
684 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
685 break;
686
687 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
688 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
689 return -1;
690 }
691 // return and the new threshold is effective for the next GC
692 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
693
694 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
695 if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
696 return -1;
697 }
698 // return and the new threshold is effective for the next GC
699 return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
700
701 default:
702 assert(false, "Unrecognized type");
703 return -1;
704 }
705
706 // When the threshold is changed, reevaluate if the low memory
707 // detection is enabled.
708 if (prev != threshold) {
709 LowMemoryDetector::recompute_enabled_for_collected_pools();
710 LowMemoryDetector::detect_low_memory(pool);
711 }
712 return prev;
713 JVM_END
714
715 // Returns a java/lang/management/MemoryUsage object representing
716 // the memory usage for the heap or non-heap memory.
717 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
718 ResourceMark rm(THREAD);
719
720 // Calculate the memory usage
721 size_t total_init = 0;
722 size_t total_used = 0;
723 size_t total_committed = 0;
724 size_t total_max = 0;
725 bool has_undefined_init_size = false;
726 bool has_undefined_max_size = false;
727
728 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
729 MemoryPool* pool = MemoryService::get_memory_pool(i);
730 if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
731 MemoryUsage u = pool->get_memory_usage();
732 total_used += u.used();
733 total_committed += u.committed();
734
735 if (u.init_size() == (size_t)-1) {
736 has_undefined_init_size = true;
737 }
738 if (!has_undefined_init_size) {
739 total_init += u.init_size();
740 }
741
742 if (u.max_size() == (size_t)-1) {
743 has_undefined_max_size = true;
744 }
745 if (!has_undefined_max_size) {
746 total_max += u.max_size();
747 }
748 }
749 }
750
751 // if any one of the memory pool has undefined init_size or max_size,
752 // set it to -1
753 if (has_undefined_init_size) {
754 total_init = (size_t)-1;
755 }
756 if (has_undefined_max_size) {
757 total_max = (size_t)-1;
758 }
759
760 MemoryUsage usage((heap ? InitialHeapSize : total_init),
761 total_used,
762 total_committed,
763 (heap ? Universe::heap()->max_capacity() : total_max));
764
765 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
766 return JNIHandles::make_local(env, obj());
767 JVM_END
768
769 // Returns the boolean value of a given attribute.
770 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
771 switch (att) {
772 case JMM_VERBOSE_GC:
773 return MemoryService::get_verbose();
774 case JMM_VERBOSE_CLASS:
775 return ClassLoadingService::get_verbose();
776 case JMM_THREAD_CONTENTION_MONITORING:
777 return ThreadService::is_thread_monitoring_contention();
778 case JMM_THREAD_CPU_TIME:
779 return ThreadService::is_thread_cpu_time_enabled();
780 case JMM_THREAD_ALLOCATED_MEMORY:
781 return ThreadService::is_thread_allocated_memory_enabled();
782 default:
783 assert(0, "Unrecognized attribute");
784 return false;
785 }
786 JVM_END
787
788 // Sets the given boolean attribute and returns the previous value.
789 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
790 switch (att) {
791 case JMM_VERBOSE_GC:
792 return MemoryService::set_verbose(flag != 0);
793 case JMM_VERBOSE_CLASS:
794 return ClassLoadingService::set_verbose(flag != 0);
795 case JMM_THREAD_CONTENTION_MONITORING:
796 return ThreadService::set_thread_monitoring_contention(flag != 0);
797 case JMM_THREAD_CPU_TIME:
798 return ThreadService::set_thread_cpu_time_enabled(flag != 0);
799 case JMM_THREAD_ALLOCATED_MEMORY:
800 return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
801 default:
802 assert(0, "Unrecognized attribute");
803 return false;
804 }
805 JVM_END
806
807
808 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
809 switch (att) {
810 case JMM_GC_TIME_MS:
811 return mgr->gc_time_ms();
812
813 case JMM_GC_COUNT:
814 return mgr->gc_count();
815
816 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
817 // current implementation only has 1 ext attribute
818 return 1;
819
820 default:
821 assert(0, "Unrecognized GC attribute");
822 return -1;
823 }
824 }
825
826 class VmThreadCountClosure: public ThreadClosure {
827 private:
828 int _count;
829 public:
830 VmThreadCountClosure() : _count(0) {};
831 void do_thread(Thread* thread);
832 int count() { return _count; }
833 };
834
835 void VmThreadCountClosure::do_thread(Thread* thread) {
836 // exclude externally visible JavaThreads
837 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
838 return;
839 }
840
841 _count++;
842 }
843
844 static jint get_vm_thread_count() {
845 VmThreadCountClosure vmtcc;
846 {
847 MutexLockerEx ml(Threads_lock);
848 Threads::threads_do(&vmtcc);
849 }
850
851 return vmtcc.count();
852 }
853
854 static jint get_num_flags() {
855 // last flag entry is always NULL, so subtract 1
856 int nFlags = (int) Flag::numFlags - 1;
857 int count = 0;
858 for (int i = 0; i < nFlags; i++) {
859 Flag* flag = &Flag::flags[i];
860 // Exclude the locked (diagnostic, experimental) flags
861 if (flag->is_unlocked() || flag->is_unlocker()) {
862 count++;
863 }
864 }
865 return count;
866 }
867
868 static jlong get_long_attribute(jmmLongAttribute att) {
869 switch (att) {
870 case JMM_CLASS_LOADED_COUNT:
871 return ClassLoadingService::loaded_class_count();
872
873 case JMM_CLASS_UNLOADED_COUNT:
874 return ClassLoadingService::unloaded_class_count();
875
876 case JMM_THREAD_TOTAL_COUNT:
877 return ThreadService::get_total_thread_count();
878
879 case JMM_THREAD_LIVE_COUNT:
880 return ThreadService::get_live_thread_count();
881
882 case JMM_THREAD_PEAK_COUNT:
883 return ThreadService::get_peak_thread_count();
884
885 case JMM_THREAD_DAEMON_COUNT:
886 return ThreadService::get_daemon_thread_count();
887
888 case JMM_JVM_INIT_DONE_TIME_MS:
889 return Management::vm_init_done_time();
890
891 case JMM_JVM_UPTIME_MS:
892 return Management::ticks_to_ms(os::elapsed_counter());
893
894 case JMM_COMPILE_TOTAL_TIME_MS:
895 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
896
897 case JMM_OS_PROCESS_ID:
898 return os::current_process_id();
899
900 // Hotspot-specific counters
901 case JMM_CLASS_LOADED_BYTES:
902 return ClassLoadingService::loaded_class_bytes();
903
904 case JMM_CLASS_UNLOADED_BYTES:
905 return ClassLoadingService::unloaded_class_bytes();
906
907 case JMM_SHARED_CLASS_LOADED_COUNT:
908 return ClassLoadingService::loaded_shared_class_count();
909
910 case JMM_SHARED_CLASS_UNLOADED_COUNT:
911 return ClassLoadingService::unloaded_shared_class_count();
912
913
914 case JMM_SHARED_CLASS_LOADED_BYTES:
915 return ClassLoadingService::loaded_shared_class_bytes();
916
917 case JMM_SHARED_CLASS_UNLOADED_BYTES:
918 return ClassLoadingService::unloaded_shared_class_bytes();
919
920 case JMM_TOTAL_CLASSLOAD_TIME_MS:
921 return ClassLoader::classloader_time_ms();
922
923 case JMM_VM_GLOBAL_COUNT:
924 return get_num_flags();
925
926 case JMM_SAFEPOINT_COUNT:
927 return RuntimeService::safepoint_count();
928
929 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
930 return RuntimeService::safepoint_sync_time_ms();
931
932 case JMM_TOTAL_STOPPED_TIME_MS:
933 return RuntimeService::safepoint_time_ms();
934
935 case JMM_TOTAL_APP_TIME_MS:
936 return RuntimeService::application_time_ms();
937
938 case JMM_VM_THREAD_COUNT:
939 return get_vm_thread_count();
940
941 case JMM_CLASS_INIT_TOTAL_COUNT:
942 return ClassLoader::class_init_count();
943
944 case JMM_CLASS_INIT_TOTAL_TIME_MS:
945 return ClassLoader::class_init_time_ms();
946
947 case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
948 return ClassLoader::class_verify_time_ms();
949
950 case JMM_METHOD_DATA_SIZE_BYTES:
951 return ClassLoadingService::class_method_data_size();
952
953 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
954 return os::physical_memory();
955
956 default:
957 return -1;
958 }
959 }
960
961
962 // Returns the long value of a given attribute.
963 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
964 if (obj == NULL) {
965 return get_long_attribute(att);
966 } else {
967 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
968 if (mgr != NULL) {
969 return get_gc_attribute(mgr, att);
970 }
971 }
972 return -1;
973 JVM_END
974
975 // Gets the value of all attributes specified in the given array
976 // and sets the value in the result array.
977 // Returns the number of attributes found.
978 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
979 jobject obj,
980 jmmLongAttribute* atts,
981 jint count,
982 jlong* result))
983
984 int num_atts = 0;
985 if (obj == NULL) {
986 for (int i = 0; i < count; i++) {
987 result[i] = get_long_attribute(atts[i]);
988 if (result[i] != -1) {
989 num_atts++;
990 }
991 }
992 } else {
993 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
994 for (int i = 0; i < count; i++) {
995 result[i] = get_gc_attribute(mgr, atts[i]);
996 if (result[i] != -1) {
997 num_atts++;
998 }
999 }
1000 }
1001 return num_atts;
1002 JVM_END
1003
1004 // Helper function to do thread dump for a specific list of threads
1005 static void do_thread_dump(ThreadDumpResult* dump_result,
1006 typeArrayHandle ids_ah, // array of thread ID (long[])
1007 int num_threads,
1008 int max_depth,
1009 bool with_locked_monitors,
1010 bool with_locked_synchronizers,
1011 TRAPS) {
1012 // no need to actually perform thread dump if no TIDs are specified
1013 if (num_threads == 0) return;
1014
1015 // First get an array of threadObj handles.
1016 // A JavaThread may terminate before we get the stack trace.
1017 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1018 {
1019 MutexLockerEx ml(Threads_lock);
1020 for (int i = 0; i < num_threads; i++) {
1021 jlong tid = ids_ah->long_at(i);
1022 JavaThread* jt = Threads::find_java_thread_from_java_tid(tid);
1023 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1024 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1025 thread_handle_array->append(threadObj_h);
1026 }
1027 }
1028
1029 // Obtain thread dumps and thread snapshot information
1030 VM_ThreadDump op(dump_result,
1031 thread_handle_array,
1032 num_threads,
1033 max_depth, /* stack depth */
1034 with_locked_monitors,
1035 with_locked_synchronizers);
1036 VMThread::execute(&op);
1037 }
1038
1039 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1040 // for the thread ID specified in the corresponding entry in
1041 // the given array of thread IDs; or NULL if the thread does not exist
1042 // or has terminated.
1043 //
1044 // Input parameters:
1045 // ids - array of thread IDs
1046 // maxDepth - the maximum depth of stack traces to be dumped:
1047 // maxDepth == -1 requests to dump entire stack trace.
1048 // maxDepth == 0 requests no stack trace.
1049 // infoArray - array of ThreadInfo objects
1050 //
1051 // QQQ - Why does this method return a value instead of void?
1052 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1053 // Check if threads is null
1054 if (ids == NULL || infoArray == NULL) {
1055 THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1056 }
1057
1058 if (maxDepth < -1) {
1059 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1060 "Invalid maxDepth", -1);
1061 }
1062
1063 ResourceMark rm(THREAD);
1064 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1065 typeArrayHandle ids_ah(THREAD, ta);
1066
1067 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1068 objArrayOop oa = objArrayOop(infoArray_obj);
1069 objArrayHandle infoArray_h(THREAD, oa);
1070
1071 // validate the thread id array
1072 validate_thread_id_array(ids_ah, CHECK_0);
1073
1074 // validate the ThreadInfo[] parameters
1075 validate_thread_info_array(infoArray_h, CHECK_0);
1076
1077 // infoArray must be of the same length as the given array of thread IDs
1078 int num_threads = ids_ah->length();
1079 if (num_threads != infoArray_h->length()) {
1080 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1081 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1082 }
1083
1084 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1085 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1086
1087 // Must use ThreadDumpResult to store the ThreadSnapshot.
1088 // GC may occur after the thread snapshots are taken but before
1089 // this function returns. The threadObj and other oops kept
1090 // in the ThreadSnapshot are marked and adjusted during GC.
1091 ThreadDumpResult dump_result(num_threads);
1092
1093 if (maxDepth == 0) {
1094 // no stack trace dumped - do not need to stop the world
1095 {
1096 MutexLockerEx ml(Threads_lock);
1097 for (int i = 0; i < num_threads; i++) {
1098 jlong tid = ids_ah->long_at(i);
1099 JavaThread* jt = Threads::find_java_thread_from_java_tid(tid);
1100 ThreadSnapshot* ts;
1101 if (jt == NULL) {
1102 // if the thread does not exist or now it is terminated,
1103 // create dummy snapshot
1104 ts = new ThreadSnapshot();
1105 } else {
1106 ts = new ThreadSnapshot(jt);
1107 }
1108 dump_result.add_thread_snapshot(ts);
1109 }
1110 }
1111 } else {
1112 // obtain thread dump with the specific list of threads with stack trace
1113 do_thread_dump(&dump_result,
1114 ids_ah,
1115 num_threads,
1116 maxDepth,
1117 false, /* no locked monitor */
1118 false, /* no locked synchronizers */
1119 CHECK_0);
1120 }
1121
1122 int num_snapshots = dump_result.num_snapshots();
1123 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1124 int index = 0;
1125 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1126 // For each thread, create an java/lang/management/ThreadInfo object
1127 // and fill with the thread information
1128
1129 if (ts->threadObj() == NULL) {
1130 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1131 infoArray_h->obj_at_put(index, NULL);
1132 continue;
1133 }
1134
1135 // Create java.lang.management.ThreadInfo object
1136 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1137 infoArray_h->obj_at_put(index, info_obj);
1138 }
1139 return 0;
1140 JVM_END
1141
1142 // Dump thread info for the specified threads.
1143 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1144 // for the thread ID specified in the corresponding entry in
1145 // the given array of thread IDs; or NULL if the thread does not exist
1146 // or has terminated.
1147 //
1148 // Input parameter:
1149 // ids - array of thread IDs; NULL indicates all live threads
1150 // locked_monitors - if true, dump locked object monitors
1151 // locked_synchronizers - if true, dump locked JSR-166 synchronizers
1152 //
1153 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers))
1154 ResourceMark rm(THREAD);
1155
1156 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1157 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1158
1159 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1160 int num_threads = (ta != NULL ? ta->length() : 0);
1161 typeArrayHandle ids_ah(THREAD, ta);
1162
1163 ThreadDumpResult dump_result(num_threads); // can safepoint
1164
1165 if (ids_ah() != NULL) {
1166
1167 // validate the thread id array
1168 validate_thread_id_array(ids_ah, CHECK_NULL);
1169
1170 // obtain thread dump of a specific list of threads
1171 do_thread_dump(&dump_result,
1172 ids_ah,
1173 num_threads,
1174 -1, /* entire stack */
1175 (locked_monitors ? true : false), /* with locked monitors */
1176 (locked_synchronizers ? true : false), /* with locked synchronizers */
1177 CHECK_NULL);
1178 } else {
1179 // obtain thread dump of all threads
1180 VM_ThreadDump op(&dump_result,
1181 -1, /* entire stack */
1182 (locked_monitors ? true : false), /* with locked monitors */
1183 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1184 VMThread::execute(&op);
1185 }
1186
1187 int num_snapshots = dump_result.num_snapshots();
1188
1189 // create the result ThreadInfo[] object
1190 Klass* k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1191 instanceKlassHandle ik (THREAD, k);
1192 objArrayOop r = oopFactory::new_objArray(ik(), num_snapshots, CHECK_NULL);
1193 objArrayHandle result_h(THREAD, r);
1194
1195 int index = 0;
1196 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1197 if (ts->threadObj() == NULL) {
1198 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1199 result_h->obj_at_put(index, NULL);
1200 continue;
1201 }
1202
1203 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1204 assert(stacktrace != NULL, "Must have a stack trace dumped");
1205
1206 // Create Object[] filled with locked monitors
1207 // Create int[] filled with the stack depth where a monitor was locked
1208 int num_frames = stacktrace->get_stack_depth();
1209 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1210
1211 // Count the total number of locked monitors
1212 for (int i = 0; i < num_frames; i++) {
1213 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1214 num_locked_monitors += frame->num_locked_monitors();
1215 }
1216
1217 objArrayHandle monitors_array;
1218 typeArrayHandle depths_array;
1219 objArrayHandle synchronizers_array;
1220
1221 if (locked_monitors) {
1222 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1223 // where the thread locked it
1224 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1225 objArrayHandle mh(THREAD, array);
1226 monitors_array = mh;
1227
1228 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1229 typeArrayHandle dh(THREAD, tarray);
1230 depths_array = dh;
1231
1232 int count = 0;
1233 int j = 0;
1234 for (int depth = 0; depth < num_frames; depth++) {
1235 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1236 int len = frame->num_locked_monitors();
1237 GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1238 for (j = 0; j < len; j++) {
1239 oop monitor = locked_monitors->at(j);
1240 assert(monitor != NULL, "must be a Java object");
1241 monitors_array->obj_at_put(count, monitor);
1242 depths_array->int_at_put(count, depth);
1243 count++;
1244 }
1245 }
1246
1247 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1248 for (j = 0; j < jni_locked_monitors->length(); j++) {
1249 oop object = jni_locked_monitors->at(j);
1250 assert(object != NULL, "must be a Java object");
1251 monitors_array->obj_at_put(count, object);
1252 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1253 depths_array->int_at_put(count, -1);
1254 count++;
1255 }
1256 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1257 }
1258
1259 if (locked_synchronizers) {
1260 // Create Object[] filled with locked JSR-166 synchronizers
1261 assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1262 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1263 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1264 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1265
1266 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1267 objArrayHandle sh(THREAD, array);
1268 synchronizers_array = sh;
1269
1270 for (int k = 0; k < num_locked_synchronizers; k++) {
1271 synchronizers_array->obj_at_put(k, locks->at(k));
1272 }
1273 }
1274
1275 // Create java.lang.management.ThreadInfo object
1276 instanceOop info_obj = Management::create_thread_info_instance(ts,
1277 monitors_array,
1278 depths_array,
1279 synchronizers_array,
1280 CHECK_NULL);
1281 result_h->obj_at_put(index, info_obj);
1282 }
1283
1284 return (jobjectArray) JNIHandles::make_local(env, result_h());
1285 JVM_END
1286
1287 // Returns an array of Class objects.
1288 JVM_ENTRY(jobjectArray, jmm_GetLoadedClasses(JNIEnv *env))
1289 ResourceMark rm(THREAD);
1290
1291 LoadedClassesEnumerator lce(THREAD); // Pass current Thread as parameter
1292
1293 int num_classes = lce.num_loaded_classes();
1294 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), num_classes, CHECK_0);
1295 objArrayHandle classes_ah(THREAD, r);
1296
1297 for (int i = 0; i < num_classes; i++) {
1298 KlassHandle kh = lce.get_klass(i);
1299 oop mirror = kh()->java_mirror();
1300 classes_ah->obj_at_put(i, mirror);
1301 }
1302
1303 return (jobjectArray) JNIHandles::make_local(env, classes_ah());
1304 JVM_END
1305
1306 // Reset statistic. Return true if the requested statistic is reset.
1307 // Otherwise, return false.
1308 //
1309 // Input parameters:
1310 // obj - specify which instance the statistic associated with to be reset
1311 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1312 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1313 // type - the type of statistic to be reset
1314 //
1315 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1316 ResourceMark rm(THREAD);
1317
1318 switch (type) {
1319 case JMM_STAT_PEAK_THREAD_COUNT:
1320 ThreadService::reset_peak_thread_count();
1321 return true;
1322
1323 case JMM_STAT_THREAD_CONTENTION_COUNT:
1324 case JMM_STAT_THREAD_CONTENTION_TIME: {
1325 jlong tid = obj.j;
1326 if (tid < 0) {
1327 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1328 }
1329
1330 // Look for the JavaThread of this given tid
1331 MutexLockerEx ml(Threads_lock);
1332 if (tid == 0) {
1333 // reset contention statistics for all threads if tid == 0
1334 for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) {
1335 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1336 ThreadService::reset_contention_count_stat(java_thread);
1337 } else {
1338 ThreadService::reset_contention_time_stat(java_thread);
1339 }
1340 }
1341 } else {
1342 // reset contention statistics for a given thread
1343 JavaThread* java_thread = Threads::find_java_thread_from_java_tid(tid);
1344 if (java_thread == NULL) {
1345 return false;
1346 }
1347
1348 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1349 ThreadService::reset_contention_count_stat(java_thread);
1350 } else {
1351 ThreadService::reset_contention_time_stat(java_thread);
1352 }
1353 }
1354 return true;
1355 break;
1356 }
1357 case JMM_STAT_PEAK_POOL_USAGE: {
1358 jobject o = obj.l;
1359 if (o == NULL) {
1360 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1361 }
1362
1363 oop pool_obj = JNIHandles::resolve(o);
1364 assert(pool_obj->is_instance(), "Should be an instanceOop");
1365 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1366
1367 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1368 if (pool != NULL) {
1369 pool->reset_peak_memory_usage();
1370 return true;
1371 }
1372 break;
1373 }
1374 case JMM_STAT_GC_STAT: {
1375 jobject o = obj.l;
1376 if (o == NULL) {
1377 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1378 }
1379
1380 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1381 if (mgr != NULL) {
1382 mgr->reset_gc_stat();
1383 return true;
1384 }
1385 break;
1386 }
1387 default:
1388 assert(0, "Unknown Statistic Type");
1389 }
1390 return false;
1391 JVM_END
1392
1393 // Returns the fast estimate of CPU time consumed by
1394 // a given thread (in nanoseconds).
1395 // If thread_id == 0, return CPU time for the current thread.
1396 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1397 if (!os::is_thread_cpu_time_supported()) {
1398 return -1;
1399 }
1400
1401 if (thread_id < 0) {
1402 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1403 "Invalid thread ID", -1);
1404 }
1405
1406 JavaThread* java_thread = NULL;
1407 if (thread_id == 0) {
1408 // current thread
1409 return os::current_thread_cpu_time();
1410 } else {
1411 MutexLockerEx ml(Threads_lock);
1412 java_thread = Threads::find_java_thread_from_java_tid(thread_id);
1413 if (java_thread != NULL) {
1414 return os::thread_cpu_time((Thread*) java_thread);
1415 }
1416 }
1417 return -1;
1418 JVM_END
1419
1420 // Returns a String array of all VM global flag names
1421 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1422 // last flag entry is always NULL, so subtract 1
1423 int nFlags = (int) Flag::numFlags - 1;
1424 // allocate a temp array
1425 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1426 nFlags, CHECK_0);
1427 objArrayHandle flags_ah(THREAD, r);
1428 int num_entries = 0;
1429 for (int i = 0; i < nFlags; i++) {
1430 Flag* flag = &Flag::flags[i];
1431 // Exclude notproduct and develop flags in product builds.
1432 if (flag->is_constant_in_binary()) {
1433 continue;
1434 }
1435 // Exclude the locked (experimental, diagnostic) flags
1436 if (flag->is_unlocked() || flag->is_unlocker()) {
1437 Handle s = java_lang_String::create_from_str(flag->_name, CHECK_0);
1438 flags_ah->obj_at_put(num_entries, s());
1439 num_entries++;
1440 }
1441 }
1442
1443 if (num_entries < nFlags) {
1444 // Return array of right length
1445 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1446 for(int i = 0; i < num_entries; i++) {
1447 res->obj_at_put(i, flags_ah->obj_at(i));
1448 }
1449 return (jobjectArray)JNIHandles::make_local(env, res);
1450 }
1451
1452 return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1453 JVM_END
1454
1455 // Utility function used by jmm_GetVMGlobals. Returns false if flag type
1456 // can't be determined, true otherwise. If false is returned, then *global
1457 // will be incomplete and invalid.
1458 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
1459 Handle flag_name;
1460 if (name() == NULL) {
1461 flag_name = java_lang_String::create_from_str(flag->_name, CHECK_false);
1462 } else {
1463 flag_name = name;
1464 }
1465 global->name = (jstring)JNIHandles::make_local(env, flag_name());
1466
1467 if (flag->is_bool()) {
1468 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1469 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1470 } else if (flag->is_int()) {
1471 global->value.j = (jlong)flag->get_int();
1472 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1473 } else if (flag->is_uint()) {
1474 global->value.j = (jlong)flag->get_uint();
1475 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1476 } else if (flag->is_intx()) {
1477 global->value.j = (jlong)flag->get_intx();
1478 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1479 } else if (flag->is_uintx()) {
1480 global->value.j = (jlong)flag->get_uintx();
1481 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1482 } else if (flag->is_uint64_t()) {
1483 global->value.j = (jlong)flag->get_uint64_t();
1484 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1485 } else if (flag->is_double()) {
1486 global->value.d = (jdouble)flag->get_double();
1487 global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1488 } else if (flag->is_size_t()) {
1489 global->value.j = (jlong)flag->get_size_t();
1490 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1491 } else if (flag->is_ccstr()) {
1492 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1493 global->value.l = (jobject)JNIHandles::make_local(env, str());
1494 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1495 } else {
1496 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1497 return false;
1498 }
1499
1500 global->writeable = flag->is_writeable();
1501 global->external = flag->is_external();
1502 switch (flag->get_origin()) {
1503 case Flag::DEFAULT:
1504 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1505 break;
1506 case Flag::COMMAND_LINE:
1507 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1508 break;
1509 case Flag::ENVIRON_VAR:
1510 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1511 break;
1512 case Flag::CONFIG_FILE:
1513 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1514 break;
1515 case Flag::MANAGEMENT:
1516 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1517 break;
1518 case Flag::ERGONOMIC:
1519 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1520 break;
1521 case Flag::ATTACH_ON_DEMAND:
1522 global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1523 break;
1524 default:
1525 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1526 }
1527
1528 return true;
1529 }
1530
1531 // Fill globals array of count length with jmmVMGlobal entries
1532 // specified by names. If names == NULL, fill globals array
1533 // with all Flags. Return value is number of entries
1534 // created in globals.
1535 // If a Flag with a given name in an array element does not
1536 // exist, globals[i].name will be set to NULL.
1537 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1538 jobjectArray names,
1539 jmmVMGlobal *globals,
1540 jint count))
1541
1542
1543 if (globals == NULL) {
1544 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1545 }
1546
1547 ResourceMark rm(THREAD);
1548
1549 if (names != NULL) {
1550 // return the requested globals
1551 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1552 objArrayHandle names_ah(THREAD, ta);
1553 // Make sure we have a String array
1554 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1555 if (element_klass != SystemDictionary::String_klass()) {
1556 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1557 "Array element type is not String class", 0);
1558 }
1559
1560 int names_length = names_ah->length();
1561 int num_entries = 0;
1562 for (int i = 0; i < names_length && i < count; i++) {
1563 oop s = names_ah->obj_at(i);
1564 if (s == NULL) {
1565 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1566 }
1567
1568 Handle sh(THREAD, s);
1569 char* str = java_lang_String::as_utf8_string(s);
1570 Flag* flag = Flag::find_flag(str, strlen(str));
1571 if (flag != NULL &&
1572 add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1573 num_entries++;
1574 } else {
1575 globals[i].name = NULL;
1576 }
1577 }
1578 return num_entries;
1579 } else {
1580 // return all globals if names == NULL
1581
1582 // last flag entry is always NULL, so subtract 1
1583 int nFlags = (int) Flag::numFlags - 1;
1584 Handle null_h;
1585 int num_entries = 0;
1586 for (int i = 0; i < nFlags && num_entries < count; i++) {
1587 Flag* flag = &Flag::flags[i];
1588 // Exclude notproduct and develop flags in product builds.
1589 if (flag->is_constant_in_binary()) {
1590 continue;
1591 }
1592 // Exclude the locked (diagnostic, experimental) flags
1593 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1594 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1595 num_entries++;
1596 }
1597 }
1598 return num_entries;
1599 }
1600 JVM_END
1601
1602 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1603 ResourceMark rm(THREAD);
1604
1605 oop fn = JNIHandles::resolve_external_guard(flag_name);
1606 if (fn == NULL) {
1607 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1608 "The flag name cannot be null.");
1609 }
1610 char* name = java_lang_String::as_utf8_string(fn);
1611
1612 FormatBuffer<80> error_msg("%s", "");
1613 int succeed = WriteableFlags::set_flag(name, new_value, Flag::MANAGEMENT, error_msg);
1614
1615 if (succeed != Flag::SUCCESS) {
1616 if (succeed == Flag::MISSING_VALUE) {
1617 // missing value causes NPE to be thrown
1618 THROW(vmSymbols::java_lang_NullPointerException());
1619 } else {
1620 // all the other errors are reported as IAE with the appropriate error message
1621 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1622 error_msg.buffer());
1623 }
1624 }
1625 assert(succeed == Flag::SUCCESS, "Setting flag should succeed");
1626 JVM_END
1627
1628 class ThreadTimesClosure: public ThreadClosure {
1629 private:
1630 objArrayHandle _names_strings;
1631 char **_names_chars;
1632 typeArrayHandle _times;
1633 int _names_len;
1634 int _times_len;
1635 int _count;
1636
1637 public:
1638 ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1639 ~ThreadTimesClosure();
1640 virtual void do_thread(Thread* thread);
1641 void do_unlocked();
1642 int count() { return _count; }
1643 };
1644
1645 ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1646 typeArrayHandle times) {
1647 assert(names() != NULL, "names was NULL");
1648 assert(times() != NULL, "times was NULL");
1649 _names_strings = names;
1650 _names_len = names->length();
1651 _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1652 _times = times;
1653 _times_len = times->length();
1654 _count = 0;
1655 }
1656
1657 //
1658 // Called with Threads_lock held
1659 //
1660 void ThreadTimesClosure::do_thread(Thread* thread) {
1661 assert(thread != NULL, "thread was NULL");
1662
1663 // exclude externally visible JavaThreads
1664 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1665 return;
1666 }
1667
1668 if (_count >= _names_len || _count >= _times_len) {
1669 // skip if the result array is not big enough
1670 return;
1671 }
1672
1673 EXCEPTION_MARK;
1674 ResourceMark rm(THREAD); // thread->name() uses ResourceArea
1675
1676 assert(thread->name() != NULL, "All threads should have a name");
1677 _names_chars[_count] = os::strdup(thread->name());
1678 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1679 os::thread_cpu_time(thread) : -1);
1680 _count++;
1681 }
1682
1683 // Called without Threads_lock, we can allocate String objects.
1684 void ThreadTimesClosure::do_unlocked() {
1685
1686 EXCEPTION_MARK;
1687 for (int i = 0; i < _count; i++) {
1688 Handle s = java_lang_String::create_from_str(_names_chars[i], CHECK);
1689 _names_strings->obj_at_put(i, s());
1690 }
1691 }
1692
1693 ThreadTimesClosure::~ThreadTimesClosure() {
1694 for (int i = 0; i < _count; i++) {
1695 os::free(_names_chars[i]);
1696 }
1697 FREE_C_HEAP_ARRAY(char *, _names_chars);
1698 }
1699
1700 // Fills names with VM internal thread names and times with the corresponding
1701 // CPU times. If names or times is NULL, a NullPointerException is thrown.
1702 // If the element type of names is not String, an IllegalArgumentException is
1703 // thrown.
1704 // If an array is not large enough to hold all the entries, only the entries
1705 // that fit will be returned. Return value is the number of VM internal
1706 // threads entries.
1707 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1708 jobjectArray names,
1709 jlongArray times))
1710 if (names == NULL || times == NULL) {
1711 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1712 }
1713 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1714 objArrayHandle names_ah(THREAD, na);
1715
1716 // Make sure we have a String array
1717 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1718 if (element_klass != SystemDictionary::String_klass()) {
1719 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1720 "Array element type is not String class", 0);
1721 }
1722
1723 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1724 typeArrayHandle times_ah(THREAD, ta);
1725
1726 ThreadTimesClosure ttc(names_ah, times_ah);
1727 {
1728 MutexLockerEx ml(Threads_lock);
1729 Threads::threads_do(&ttc);
1730 }
1731 ttc.do_unlocked();
1732 return ttc.count();
1733 JVM_END
1734
1735 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1736 ResourceMark rm(THREAD);
1737
1738 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1739 VMThread::execute(&op);
1740
1741 DeadlockCycle* deadlocks = op.result();
1742 if (deadlocks == NULL) {
1743 // no deadlock found and return
1744 return Handle();
1745 }
1746
1747 int num_threads = 0;
1748 DeadlockCycle* cycle;
1749 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1750 num_threads += cycle->num_threads();
1751 }
1752
1753 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1754 objArrayHandle threads_ah(THREAD, r);
1755
1756 int index = 0;
1757 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1758 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1759 int len = deadlock_threads->length();
1760 for (int i = 0; i < len; i++) {
1761 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1762 index++;
1763 }
1764 }
1765 return threads_ah;
1766 }
1767
1768 // Finds cycles of threads that are deadlocked involved in object monitors
1769 // and JSR-166 synchronizers.
1770 // Returns an array of Thread objects which are in deadlock, if any.
1771 // Otherwise, returns NULL.
1772 //
1773 // Input parameter:
1774 // object_monitors_only - if true, only check object monitors
1775 //
1776 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1777 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1778 return (jobjectArray) JNIHandles::make_local(env, result());
1779 JVM_END
1780
1781 // Finds cycles of threads that are deadlocked on monitor locks
1782 // Returns an array of Thread objects which are in deadlock, if any.
1783 // Otherwise, returns NULL.
1784 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1785 Handle result = find_deadlocks(true, CHECK_0);
1786 return (jobjectArray) JNIHandles::make_local(env, result());
1787 JVM_END
1788
1789 // Gets the information about GC extension attributes including
1790 // the name of the attribute, its type, and a short description.
1791 //
1792 // Input parameters:
1793 // mgr - GC memory manager
1794 // info - caller allocated array of jmmExtAttributeInfo
1795 // count - number of elements of the info array
1796 //
1797 // Returns the number of GC extension attributes filled in the info array; or
1798 // -1 if info is not big enough
1799 //
1800 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1801 // All GC memory managers have 1 attribute (number of GC threads)
1802 if (count == 0) {
1803 return 0;
1804 }
1805
1806 if (info == NULL) {
1807 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1808 }
1809
1810 info[0].name = "GcThreadCount";
1811 info[0].type = 'I';
1812 info[0].description = "Number of GC threads";
1813 return 1;
1814 JVM_END
1815
1816 // verify the given array is an array of java/lang/management/MemoryUsage objects
1817 // of a given length and return the objArrayOop
1818 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1819 if (array == NULL) {
1820 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1821 }
1822
1823 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1824 objArrayHandle array_h(THREAD, oa);
1825
1826 // array must be of the given length
1827 if (length != array_h->length()) {
1828 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1829 "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1830 }
1831
1832 // check if the element of array is of type MemoryUsage class
1833 Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1834 Klass* element_klass = ObjArrayKlass::cast(array_h->klass())->element_klass();
1835 if (element_klass != usage_klass) {
1836 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1837 "The element type is not MemoryUsage class", 0);
1838 }
1839
1840 return array_h();
1841 }
1842
1843 // Gets the statistics of the last GC of a given GC memory manager.
1844 // Input parameters:
1845 // obj - GarbageCollectorMXBean object
1846 // gc_stat - caller allocated jmmGCStat where:
1847 // a. before_gc_usage - array of MemoryUsage objects
1848 // b. after_gc_usage - array of MemoryUsage objects
1849 // c. gc_ext_attributes_values_size is set to the
1850 // gc_ext_attribute_values array allocated
1851 // d. gc_ext_attribute_values is a caller allocated array of jvalue.
1852 //
1853 // On return,
1854 // gc_index == 0 indicates no GC statistics available
1855 //
1856 // before_gc_usage and after_gc_usage - filled with per memory pool
1857 // before and after GC usage in the same order as the memory pools
1858 // returned by GetMemoryPools for a given GC memory manager.
1859 // num_gc_ext_attributes indicates the number of elements in
1860 // the gc_ext_attribute_values array is filled; or
1861 // -1 if the gc_ext_attributes_values array is not big enough
1862 //
1863 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
1864 ResourceMark rm(THREAD);
1865
1866 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
1867 THROW(vmSymbols::java_lang_NullPointerException());
1868 }
1869
1870 // Get the GCMemoryManager
1871 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1872
1873 // Make a copy of the last GC statistics
1874 // GC may occur while constructing the last GC information
1875 int num_pools = MemoryService::num_memory_pools();
1876 GCStatInfo stat(num_pools);
1877 if (mgr->get_last_gc_stat(&stat) == 0) {
1878 gc_stat->gc_index = 0;
1879 return;
1880 }
1881
1882 gc_stat->gc_index = stat.gc_index();
1883 gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
1884 gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
1885
1886 // Current implementation does not have GC extension attributes
1887 gc_stat->num_gc_ext_attributes = 0;
1888
1889 // Fill the arrays of MemoryUsage objects with before and after GC
1890 // per pool memory usage
1891 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
1892 num_pools,
1893 CHECK);
1894 objArrayHandle usage_before_gc_ah(THREAD, bu);
1895
1896 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
1897 num_pools,
1898 CHECK);
1899 objArrayHandle usage_after_gc_ah(THREAD, au);
1900
1901 for (int i = 0; i < num_pools; i++) {
1902 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
1903 Handle after_usage;
1904
1905 MemoryUsage u = stat.after_gc_usage_for_pool(i);
1906 if (u.max_size() == 0 && u.used() > 0) {
1907 // If max size == 0, this pool is a survivor space.
1908 // Set max size = -1 since the pools will be swapped after GC.
1909 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
1910 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
1911 } else {
1912 after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
1913 }
1914 usage_before_gc_ah->obj_at_put(i, before_usage());
1915 usage_after_gc_ah->obj_at_put(i, after_usage());
1916 }
1917
1918 if (gc_stat->gc_ext_attribute_values_size > 0) {
1919 // Current implementation only has 1 attribute (number of GC threads)
1920 // The type is 'I'
1921 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
1922 }
1923 JVM_END
1924
1925 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
1926 ResourceMark rm(THREAD);
1927 // Get the GCMemoryManager
1928 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
1929 mgr->set_notification_enabled(enabled?true:false);
1930 JVM_END
1931
1932 // Dump heap - Returns 0 if succeeds.
1933 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
1934 #if INCLUDE_SERVICES
1935 ResourceMark rm(THREAD);
1936 oop on = JNIHandles::resolve_external_guard(outputfile);
1937 if (on == NULL) {
1938 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1939 "Output file name cannot be null.", -1);
1940 }
1941 char* name = java_lang_String::as_platform_dependent_str(on, CHECK_(-1));
1942 if (name == NULL) {
1943 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1944 "Output file name cannot be null.", -1);
1945 }
1946 HeapDumper dumper(live ? true : false);
1947 if (dumper.dump(name) != 0) {
1948 const char* errmsg = dumper.error_as_C_string();
1949 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1950 }
1951 return 0;
1952 #else // INCLUDE_SERVICES
1953 return -1;
1954 #endif // INCLUDE_SERVICES
1955 JVM_END
1956
1957 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1958 ResourceMark rm(THREAD);
1959 GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1960 objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
1961 dcmd_list->length(), CHECK_NULL);
1962 objArrayHandle cmd_array(THREAD, cmd_array_oop);
1963 for (int i = 0; i < dcmd_list->length(); i++) {
1964 oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1965 cmd_array->obj_at_put(i, cmd_name);
1966 }
1967 return (jobjectArray) JNIHandles::make_local(env, cmd_array());
1968 JVM_END
1969
1970 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1971 dcmdInfo* infoArray))
1972 if (cmds == NULL || infoArray == NULL) {
1973 THROW(vmSymbols::java_lang_NullPointerException());
1974 }
1975
1976 ResourceMark rm(THREAD);
1977
1978 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
1979 objArrayHandle cmds_ah(THREAD, ca);
1980
1981 // Make sure we have a String array
1982 Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
1983 if (element_klass != SystemDictionary::String_klass()) {
1984 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1985 "Array element type is not String class");
1986 }
1987
1988 GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
1989
1990 int num_cmds = cmds_ah->length();
1991 for (int i = 0; i < num_cmds; i++) {
1992 oop cmd = cmds_ah->obj_at(i);
1993 if (cmd == NULL) {
1994 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1995 "Command name cannot be null.");
1996 }
1997 char* cmd_name = java_lang_String::as_utf8_string(cmd);
1998 if (cmd_name == NULL) {
1999 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2000 "Command name cannot be null.");
2001 }
2002 int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
2003 if (pos == -1) {
2004 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2005 "Unknown diagnostic command");
2006 }
2007 DCmdInfo* info = info_list->at(pos);
2008 infoArray[i].name = info->name();
2009 infoArray[i].description = info->description();
2010 infoArray[i].impact = info->impact();
2011 JavaPermission p = info->permission();
2012 infoArray[i].permission_class = p._class;
2013 infoArray[i].permission_name = p._name;
2014 infoArray[i].permission_action = p._action;
2015 infoArray[i].num_arguments = info->num_arguments();
2016 infoArray[i].enabled = info->is_enabled();
2017 }
2018 JVM_END
2019
2020 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2021 jstring command, dcmdArgInfo* infoArray))
2022 ResourceMark rm(THREAD);
2023 oop cmd = JNIHandles::resolve_external_guard(command);
2024 if (cmd == NULL) {
2025 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2026 "Command line cannot be null.");
2027 }
2028 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2029 if (cmd_name == NULL) {
2030 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2031 "Command line content cannot be null.");
2032 }
2033 DCmd* dcmd = NULL;
2034 DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2035 strlen(cmd_name));
2036 if (factory != NULL) {
2037 dcmd = factory->create_resource_instance(NULL);
2038 }
2039 if (dcmd == NULL) {
2040 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2041 "Unknown diagnostic command");
2042 }
2043 DCmdMark mark(dcmd);
2044 GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2045 if (array->length() == 0) {
2046 return;
2047 }
2048 for (int i = 0; i < array->length(); i++) {
2049 infoArray[i].name = array->at(i)->name();
2050 infoArray[i].description = array->at(i)->description();
2051 infoArray[i].type = array->at(i)->type();
2052 infoArray[i].default_string = array->at(i)->default_string();
2053 infoArray[i].mandatory = array->at(i)->is_mandatory();
2054 infoArray[i].option = array->at(i)->is_option();
2055 infoArray[i].multiple = array->at(i)->is_multiple();
2056 infoArray[i].position = array->at(i)->position();
2057 }
2058 return;
2059 JVM_END
2060
2061 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2062 ResourceMark rm(THREAD);
2063 oop cmd = JNIHandles::resolve_external_guard(commandline);
2064 if (cmd == NULL) {
2065 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2066 "Command line cannot be null.");
2067 }
2068 char* cmdline = java_lang_String::as_utf8_string(cmd);
2069 if (cmdline == NULL) {
2070 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2071 "Command line content cannot be null.");
2072 }
2073 bufferedStream output;
2074 DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2075 oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2076 return (jstring) JNIHandles::make_local(env, result);
2077 JVM_END
2078
2079 JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2080 DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2081 JVM_END
2082
2083 jlong Management::ticks_to_ms(jlong ticks) {
2084 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2085 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2086 * (double)1000.0);
2087 }
2088 #endif // INCLUDE_MANAGEMENT
2089
2090 // Gets an array containing the amount of memory allocated on the Java
2091 // heap for a set of threads (in bytes). Each element of the array is
2092 // the amount of memory allocated for the thread ID specified in the
2093 // corresponding entry in the given array of thread IDs; or -1 if the
2094 // thread does not exist or has terminated.
2095 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2096 jlongArray sizeArray))
2097 // Check if threads is null
2098 if (ids == NULL || sizeArray == NULL) {
2099 THROW(vmSymbols::java_lang_NullPointerException());
2100 }
2101
2102 ResourceMark rm(THREAD);
2103 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2104 typeArrayHandle ids_ah(THREAD, ta);
2105
2106 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2107 typeArrayHandle sizeArray_h(THREAD, sa);
2108
2109 // validate the thread id array
2110 validate_thread_id_array(ids_ah, CHECK);
2111
2112 // sizeArray must be of the same length as the given array of thread IDs
2113 int num_threads = ids_ah->length();
2114 if (num_threads != sizeArray_h->length()) {
2115 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2116 "The length of the given long array does not match the length of "
2117 "the given array of thread IDs");
2118 }
2119
2120 MutexLockerEx ml(Threads_lock);
2121 for (int i = 0; i < num_threads; i++) {
2122 JavaThread* java_thread = Threads::find_java_thread_from_java_tid(ids_ah->long_at(i));
2123 if (java_thread != NULL) {
2124 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2125 }
2126 }
2127 JVM_END
2128
2129 // Returns the CPU time consumed by a given thread (in nanoseconds).
2130 // If thread_id == 0, CPU time for the current thread is returned.
2131 // If user_sys_cpu_time = true, user level and system CPU time of
2132 // a given thread is returned; otherwise, only user level CPU time
2133 // is returned.
2134 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2135 if (!os::is_thread_cpu_time_supported()) {
2136 return -1;
2137 }
2138
2139 if (thread_id < 0) {
2140 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2141 "Invalid thread ID", -1);
2142 }
2143
2144 JavaThread* java_thread = NULL;
2145 if (thread_id == 0) {
2146 // current thread
2147 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2148 } else {
2149 MutexLockerEx ml(Threads_lock);
2150 java_thread = Threads::find_java_thread_from_java_tid(thread_id);
2151 if (java_thread != NULL) {
2152 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2153 }
2154 }
2155 return -1;
2156 JVM_END
2157
2158 // Gets an array containing the CPU times consumed by a set of threads
2159 // (in nanoseconds). Each element of the array is the CPU time for the
2160 // thread ID specified in the corresponding entry in the given array
2161 // of thread IDs; or -1 if the thread does not exist or has terminated.
2162 // If user_sys_cpu_time = true, the sum of user level and system CPU time
2163 // for the given thread is returned; otherwise, only user level CPU time
2164 // is returned.
2165 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2166 jlongArray timeArray,
2167 jboolean user_sys_cpu_time))
2168 // Check if threads is null
2169 if (ids == NULL || timeArray == NULL) {
2170 THROW(vmSymbols::java_lang_NullPointerException());
2171 }
2172
2173 ResourceMark rm(THREAD);
2174 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2175 typeArrayHandle ids_ah(THREAD, ta);
2176
2177 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2178 typeArrayHandle timeArray_h(THREAD, tia);
2179
2180 // validate the thread id array
2181 validate_thread_id_array(ids_ah, CHECK);
2182
2183 // timeArray must be of the same length as the given array of thread IDs
2184 int num_threads = ids_ah->length();
2185 if (num_threads != timeArray_h->length()) {
2186 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2187 "The length of the given long array does not match the length of "
2188 "the given array of thread IDs");
2189 }
2190
2191 MutexLockerEx ml(Threads_lock);
2192 for (int i = 0; i < num_threads; i++) {
2193 JavaThread* java_thread = Threads::find_java_thread_from_java_tid(ids_ah->long_at(i));
2194 if (java_thread != NULL) {
2195 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2196 user_sys_cpu_time != 0));
2197 }
2198 }
2199 JVM_END
2200
2201
2202
2203 #if INCLUDE_MANAGEMENT
2204 const struct jmmInterface_1_ jmm_interface = {
2205 NULL,
2206 NULL,
2207 jmm_GetVersion,
2208 jmm_GetOptionalSupport,
2209 jmm_GetThreadInfo,
2210 jmm_GetMemoryPools,
2211 jmm_GetMemoryManagers,
2212 jmm_GetMemoryPoolUsage,
2213 jmm_GetPeakMemoryPoolUsage,
2214 jmm_GetThreadAllocatedMemory,
2215 jmm_GetMemoryUsage,
2216 jmm_GetLongAttribute,
2217 jmm_GetBoolAttribute,
2218 jmm_SetBoolAttribute,
2219 jmm_GetLongAttributes,
2220 jmm_FindMonitorDeadlockedThreads,
2221 jmm_GetThreadCpuTime,
2222 jmm_GetVMGlobalNames,
2223 jmm_GetVMGlobals,
2224 jmm_GetInternalThreadTimes,
2225 jmm_ResetStatistic,
2226 jmm_SetPoolSensor,
2227 jmm_SetPoolThreshold,
2228 jmm_GetPoolCollectionUsage,
2229 jmm_GetGCExtAttributeInfo,
2230 jmm_GetLastGCStat,
2231 jmm_GetThreadCpuTimeWithKind,
2232 jmm_GetThreadCpuTimesWithKind,
2233 jmm_DumpHeap0,
2234 jmm_FindDeadlockedThreads,
2235 jmm_SetVMGlobal,
2236 NULL,
2237 jmm_DumpThreads,
2238 jmm_SetGCNotificationEnabled,
2239 jmm_GetDiagnosticCommands,
2240 jmm_GetDiagnosticCommandInfo,
2241 jmm_GetDiagnosticCommandArgumentsInfo,
2242 jmm_ExecuteDiagnosticCommand,
2243 jmm_SetDiagnosticFrameworkNotificationEnabled
2244 };
2245 #endif // INCLUDE_MANAGEMENT
2246
2247 void* Management::get_jmm_interface(int version) {
2248 #if INCLUDE_MANAGEMENT
2249 if (version == JMM_VERSION_1_0) {
2250 return (void*) &jmm_interface;
2251 }
2252 #endif // INCLUDE_MANAGEMENT
2253 return NULL;
2254 }