1 /*
2 * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jmm.h"
27 #include "classfile/systemDictionary.hpp"
28 #include "compiler/compileBroker.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/iterator.hpp"
31 #include "memory/oopFactory.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "oops/klass.hpp"
34 #include "oops/objArrayKlass.hpp"
35 #include "oops/objArrayOop.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "oops/typeArrayOop.inline.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/globals.hpp"
40 #include "runtime/handles.inline.hpp"
41 #include "runtime/interfaceSupport.inline.hpp"
42 #include "runtime/javaCalls.hpp"
43 #include "runtime/jniHandles.inline.hpp"
44 #include "runtime/os.hpp"
45 #include "runtime/serviceThread.hpp"
46 #include "runtime/thread.inline.hpp"
47 #include "runtime/threadSMR.hpp"
48 #include "services/classLoadingService.hpp"
49 #include "services/diagnosticCommand.hpp"
50 #include "services/diagnosticFramework.hpp"
51 #include "services/writeableFlags.hpp"
52 #include "services/heapDumper.hpp"
53 #include "services/lowMemoryDetector.hpp"
54 #include "services/gcNotifier.hpp"
55 #include "services/nmtDCmd.hpp"
56 #include "services/management.hpp"
57 #include "services/memoryManager.hpp"
58 #include "services/memoryPool.hpp"
59 #include "services/memoryService.hpp"
60 #include "services/runtimeService.hpp"
61 #include "services/threadService.hpp"
62 #include "utilities/debug.hpp"
63 #include "utilities/formatBuffer.hpp"
64 #include "utilities/macros.hpp"
65
66 PerfVariable* Management::_begin_vm_creation_time = NULL;
67 PerfVariable* Management::_end_vm_creation_time = NULL;
68 PerfVariable* Management::_vm_init_done_time = NULL;
69
70 InstanceKlass* Management::_diagnosticCommandImpl_klass = NULL;
71 InstanceKlass* Management::_garbageCollectorExtImpl_klass = NULL;
72 InstanceKlass* Management::_garbageCollectorMXBean_klass = NULL;
73 InstanceKlass* Management::_gcInfo_klass = NULL;
74 InstanceKlass* Management::_managementFactoryHelper_klass = NULL;
75 InstanceKlass* Management::_memoryManagerMXBean_klass = NULL;
76 InstanceKlass* Management::_memoryPoolMXBean_klass = NULL;
77 InstanceKlass* Management::_memoryUsage_klass = NULL;
78 InstanceKlass* Management::_sensor_klass = NULL;
79 InstanceKlass* Management::_threadInfo_klass = NULL;
80
81 jmmOptionalSupport Management::_optional_support = {0};
82 TimeStamp Management::_stamp;
83
84 void management_init() {
85 #if INCLUDE_MANAGEMENT
86 Management::init();
87 ThreadService::init();
88 RuntimeService::init();
89 ClassLoadingService::init();
90 #else
91 ThreadService::init();
92 #endif // INCLUDE_MANAGEMENT
93 }
94
95 #if INCLUDE_MANAGEMENT
96
97 void Management::init() {
98 EXCEPTION_MARK;
99
100 // These counters are for java.lang.management API support.
101 // They are created even if -XX:-UsePerfData is set and in
102 // that case, they will be allocated on C heap.
103
104 _begin_vm_creation_time =
105 PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
106 PerfData::U_None, CHECK);
107
108 _end_vm_creation_time =
109 PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
110 PerfData::U_None, CHECK);
111
112 _vm_init_done_time =
113 PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
114 PerfData::U_None, CHECK);
115
116 // Initialize optional support
117 _optional_support.isLowMemoryDetectionSupported = 1;
118 _optional_support.isCompilationTimeMonitoringSupported = 1;
119 _optional_support.isThreadContentionMonitoringSupported = 1;
120
121 if (os::is_thread_cpu_time_supported()) {
122 _optional_support.isCurrentThreadCpuTimeSupported = 1;
123 _optional_support.isOtherThreadCpuTimeSupported = 1;
124 } else {
125 _optional_support.isCurrentThreadCpuTimeSupported = 0;
126 _optional_support.isOtherThreadCpuTimeSupported = 0;
127 }
128
129 _optional_support.isObjectMonitorUsageSupported = 1;
130 #if INCLUDE_SERVICES
131 // This depends on the heap inspector
132 _optional_support.isSynchronizerUsageSupported = 1;
133 #endif // INCLUDE_SERVICES
134 _optional_support.isThreadAllocatedMemorySupported = 1;
135 _optional_support.isRemoteDiagnosticCommandsSupported = 1;
136
137 // Registration of the diagnostic commands
138 DCmdRegistrant::register_dcmds();
139 DCmdRegistrant::register_dcmds_ext();
140 uint32_t full_export = DCmd_Source_Internal | DCmd_Source_AttachAPI
141 | DCmd_Source_MBean;
142 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(full_export, true, false));
143 }
144
145 void Management::initialize(TRAPS) {
146 // Start the service thread
147 ServiceThread::initialize();
148
149 if (ManagementServer) {
150 ResourceMark rm(THREAD);
151 HandleMark hm(THREAD);
152
153 // Load and initialize the jdk.internal.agent.Agent class
154 // invoke startAgent method to start the management server
155 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
156 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_agent_Agent(),
157 loader,
158 Handle(),
159 THREAD);
160 if (k == NULL) {
161 vm_exit_during_initialization("Management agent initialization failure: "
162 "class jdk.internal.agent.Agent not found.");
163 }
164
165 JavaValue result(T_VOID);
166 JavaCalls::call_static(&result,
167 k,
168 vmSymbols::startAgent_name(),
169 vmSymbols::void_method_signature(),
170 CHECK);
171 }
172 }
173
174 void Management::get_optional_support(jmmOptionalSupport* support) {
175 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
176 }
177
178 InstanceKlass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
179 Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
180 return initialize_klass(k, CHECK_NULL);
181 }
182
183 InstanceKlass* Management::load_and_initialize_klass_or_null(Symbol* sh, TRAPS) {
184 Klass* k = SystemDictionary::resolve_or_null(sh, CHECK_NULL);
185 if (k == NULL) {
186 return NULL;
187 }
188 return initialize_klass(k, CHECK_NULL);
189 }
190
191 InstanceKlass* Management::initialize_klass(Klass* k, TRAPS) {
192 InstanceKlass* ik = InstanceKlass::cast(k);
193 if (ik->should_be_initialized()) {
194 ik->initialize(CHECK_NULL);
195 }
196 // If these classes change to not be owned by the boot loader, they need
197 // to be walked to keep their class loader alive in oops_do.
198 assert(ik->class_loader() == NULL, "need to follow in oops_do");
199 return ik;
200 }
201
202 void Management::record_vm_startup_time(jlong begin, jlong duration) {
203 // if the performance counter is not initialized,
204 // then vm initialization failed; simply return.
205 if (_begin_vm_creation_time == NULL) return;
206
207 _begin_vm_creation_time->set_value(begin);
208 _end_vm_creation_time->set_value(begin + duration);
209 PerfMemory::set_accessible(true);
210 }
211
212 jlong Management::timestamp() {
213 TimeStamp t;
214 t.update();
215 return t.ticks() - _stamp.ticks();
216 }
217
218 void Management::oops_do(OopClosure* f) {
219 MemoryService::oops_do(f);
220 ThreadService::oops_do(f);
221 }
222
223 InstanceKlass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {
224 if (_threadInfo_klass == NULL) {
225 _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
226 }
227 return _threadInfo_klass;
228 }
229
230 InstanceKlass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {
231 if (_memoryUsage_klass == NULL) {
232 _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
233 }
234 return _memoryUsage_klass;
235 }
236
237 InstanceKlass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
238 if (_memoryPoolMXBean_klass == NULL) {
239 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
240 }
241 return _memoryPoolMXBean_klass;
242 }
243
244 InstanceKlass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
245 if (_memoryManagerMXBean_klass == NULL) {
246 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
247 }
248 return _memoryManagerMXBean_klass;
249 }
250
251 InstanceKlass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
252 if (_garbageCollectorMXBean_klass == NULL) {
253 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
254 }
255 return _garbageCollectorMXBean_klass;
256 }
257
258 InstanceKlass* Management::sun_management_Sensor_klass(TRAPS) {
259 if (_sensor_klass == NULL) {
260 _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
261 }
262 return _sensor_klass;
263 }
264
265 InstanceKlass* Management::sun_management_ManagementFactoryHelper_klass(TRAPS) {
266 if (_managementFactoryHelper_klass == NULL) {
267 _managementFactoryHelper_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactoryHelper(), CHECK_NULL);
268 }
269 return _managementFactoryHelper_klass;
270 }
271
272 InstanceKlass* Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(TRAPS) {
273 if (_garbageCollectorExtImpl_klass == NULL) {
274 _garbageCollectorExtImpl_klass =
275 load_and_initialize_klass_or_null(vmSymbols::com_sun_management_internal_GarbageCollectorExtImpl(), CHECK_NULL);
276 }
277 return _garbageCollectorExtImpl_klass;
278 }
279
280 InstanceKlass* Management::com_sun_management_GcInfo_klass(TRAPS) {
281 if (_gcInfo_klass == NULL) {
282 _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
283 }
284 return _gcInfo_klass;
285 }
286
287 InstanceKlass* Management::com_sun_management_internal_DiagnosticCommandImpl_klass(TRAPS) {
288 if (_diagnosticCommandImpl_klass == NULL) {
289 _diagnosticCommandImpl_klass = load_and_initialize_klass(vmSymbols::com_sun_management_internal_DiagnosticCommandImpl(), CHECK_NULL);
290 }
291 return _diagnosticCommandImpl_klass;
292 }
293
294 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
295 Handle snapshot_thread(THREAD, snapshot->threadObj());
296
297 jlong contended_time;
298 jlong waited_time;
299 if (ThreadService::is_thread_monitoring_contention()) {
300 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
301 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
302 } else {
303 // set them to -1 if thread contention monitoring is disabled.
304 contended_time = max_julong;
305 waited_time = max_julong;
306 }
307
308 int thread_status = snapshot->thread_status();
309 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
310 if (snapshot->is_ext_suspended()) {
311 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
312 }
313 if (snapshot->is_in_native()) {
314 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
315 }
316
317 ThreadStackTrace* st = snapshot->get_stack_trace();
318 Handle stacktrace_h;
319 if (st != NULL) {
320 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
321 } else {
322 stacktrace_h = Handle();
323 }
324
325 args->push_oop(snapshot_thread);
326 args->push_int(thread_status);
327 args->push_oop(Handle(THREAD, snapshot->blocker_object()));
328 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
329 args->push_long(snapshot->contended_enter_count());
330 args->push_long(contended_time);
331 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
332 args->push_long(waited_time);
333 args->push_oop(stacktrace_h);
334 }
335
336 // Helper function to construct a ThreadInfo object
337 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
338 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
339
340 JavaValue result(T_VOID);
341 JavaCallArguments args(14);
342
343 // First allocate a ThreadObj object and
344 // push the receiver as the first argument
345 Handle element = ik->allocate_instance_handle(CHECK_NULL);
346 args.push_oop(element);
347
348 // initialize the arguments for the ThreadInfo constructor
349 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
350
351 // Call ThreadInfo constructor with no locked monitors and synchronizers
352 JavaCalls::call_special(&result,
353 ik,
354 vmSymbols::object_initializer_name(),
355 vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
356 &args,
357 CHECK_NULL);
358
359 return (instanceOop) element();
360 }
361
362 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
363 objArrayHandle monitors_array,
364 typeArrayHandle depths_array,
365 objArrayHandle synchronizers_array,
366 TRAPS) {
367 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
368
369 JavaValue result(T_VOID);
370 JavaCallArguments args(17);
371
372 // First allocate a ThreadObj object and
373 // push the receiver as the first argument
374 Handle element = ik->allocate_instance_handle(CHECK_NULL);
375 args.push_oop(element);
376
377 // initialize the arguments for the ThreadInfo constructor
378 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
379
380 // push the locked monitors and synchronizers in the arguments
381 args.push_oop(monitors_array);
382 args.push_oop(depths_array);
383 args.push_oop(synchronizers_array);
384
385 // Call ThreadInfo constructor with locked monitors and synchronizers
386 JavaCalls::call_special(&result,
387 ik,
388 vmSymbols::object_initializer_name(),
389 vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
390 &args,
391 CHECK_NULL);
392
393 return (instanceOop) element();
394 }
395
396
397 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
398 if (mgr == NULL) {
399 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
400 }
401 oop mgr_obj = JNIHandles::resolve(mgr);
402 instanceHandle h(THREAD, (instanceOop) mgr_obj);
403
404 InstanceKlass* k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
405 if (!h->is_a(k)) {
406 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
407 "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
408 NULL);
409 }
410
411 MemoryManager* gc = MemoryService::get_memory_manager(h);
412 if (gc == NULL || !gc->is_gc_memory_manager()) {
413 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
414 "Invalid GC memory manager",
415 NULL);
416 }
417 return (GCMemoryManager*) gc;
418 }
419
420 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
421 if (obj == NULL) {
422 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
423 }
424
425 oop pool_obj = JNIHandles::resolve(obj);
426 assert(pool_obj->is_instance(), "Should be an instanceOop");
427 instanceHandle ph(THREAD, (instanceOop) pool_obj);
428
429 return MemoryService::get_memory_pool(ph);
430 }
431
432 #endif // INCLUDE_MANAGEMENT
433
434 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
435 int num_threads = ids_ah->length();
436
437 // Validate input thread IDs
438 int i = 0;
439 for (i = 0; i < num_threads; i++) {
440 jlong tid = ids_ah->long_at(i);
441 if (tid <= 0) {
442 // throw exception if invalid thread id.
443 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
444 "Invalid thread ID entry");
445 }
446 }
447 }
448
449 #if INCLUDE_MANAGEMENT
450
451 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
452 // check if the element of infoArray is of type ThreadInfo class
453 Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
454 Klass* element_klass = ObjArrayKlass::cast(infoArray_h->klass())->element_klass();
455 if (element_klass != threadinfo_klass) {
456 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
457 "infoArray element type is not ThreadInfo class");
458 }
459 }
460
461
462 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
463 if (obj == NULL) {
464 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
465 }
466
467 oop mgr_obj = JNIHandles::resolve(obj);
468 assert(mgr_obj->is_instance(), "Should be an instanceOop");
469 instanceHandle mh(THREAD, (instanceOop) mgr_obj);
470
471 return MemoryService::get_memory_manager(mh);
472 }
473
474 // Returns a version string and sets major and minor version if
475 // the input parameters are non-null.
476 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
477 return JMM_VERSION;
478 JVM_END
479
480 // Gets the list of VM monitoring and management optional supports
481 // Returns 0 if succeeded; otherwise returns non-zero.
482 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
483 if (support == NULL) {
484 return -1;
485 }
486 Management::get_optional_support(support);
487 return 0;
488 JVM_END
489
490 // Returns an array of java/lang/management/MemoryPoolMXBean object
491 // one for each memory pool if obj == null; otherwise returns
492 // an array of memory pools for a given memory manager if
493 // it is a valid memory manager.
494 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
495 ResourceMark rm(THREAD);
496
497 int num_memory_pools;
498 MemoryManager* mgr = NULL;
499 if (obj == NULL) {
500 num_memory_pools = MemoryService::num_memory_pools();
501 } else {
502 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
503 if (mgr == NULL) {
504 return NULL;
505 }
506 num_memory_pools = mgr->num_memory_pools();
507 }
508
509 // Allocate the resulting MemoryPoolMXBean[] object
510 InstanceKlass* ik = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
511 objArrayOop r = oopFactory::new_objArray(ik, num_memory_pools, CHECK_NULL);
512 objArrayHandle poolArray(THREAD, r);
513
514 if (mgr == NULL) {
515 // Get all memory pools
516 for (int i = 0; i < num_memory_pools; i++) {
517 MemoryPool* pool = MemoryService::get_memory_pool(i);
518 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
519 instanceHandle ph(THREAD, p);
520 poolArray->obj_at_put(i, ph());
521 }
522 } else {
523 // Get memory pools managed by a given memory manager
524 for (int i = 0; i < num_memory_pools; i++) {
525 MemoryPool* pool = mgr->get_memory_pool(i);
526 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
527 instanceHandle ph(THREAD, p);
528 poolArray->obj_at_put(i, ph());
529 }
530 }
531 return (jobjectArray) JNIHandles::make_local(env, poolArray());
532 JVM_END
533
534 // Returns an array of java/lang/management/MemoryManagerMXBean object
535 // one for each memory manager if obj == null; otherwise returns
536 // an array of memory managers for a given memory pool if
537 // it is a valid memory pool.
538 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
539 ResourceMark rm(THREAD);
540
541 int num_mgrs;
542 MemoryPool* pool = NULL;
543 if (obj == NULL) {
544 num_mgrs = MemoryService::num_memory_managers();
545 } else {
546 pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
547 if (pool == NULL) {
548 return NULL;
549 }
550 num_mgrs = pool->num_memory_managers();
551 }
552
553 // Allocate the resulting MemoryManagerMXBean[] object
554 InstanceKlass* ik = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
555 objArrayOop r = oopFactory::new_objArray(ik, num_mgrs, CHECK_NULL);
556 objArrayHandle mgrArray(THREAD, r);
557
558 if (pool == NULL) {
559 // Get all memory managers
560 for (int i = 0; i < num_mgrs; i++) {
561 MemoryManager* mgr = MemoryService::get_memory_manager(i);
562 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
563 instanceHandle ph(THREAD, p);
564 mgrArray->obj_at_put(i, ph());
565 }
566 } else {
567 // Get memory managers for a given memory pool
568 for (int i = 0; i < num_mgrs; i++) {
569 MemoryManager* mgr = pool->get_memory_manager(i);
570 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
571 instanceHandle ph(THREAD, p);
572 mgrArray->obj_at_put(i, ph());
573 }
574 }
575 return (jobjectArray) JNIHandles::make_local(env, mgrArray());
576 JVM_END
577
578
579 // Returns a java/lang/management/MemoryUsage object containing the memory usage
580 // of a given memory pool.
581 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
582 ResourceMark rm(THREAD);
583
584 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
585 if (pool != NULL) {
586 MemoryUsage usage = pool->get_memory_usage();
587 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
588 return JNIHandles::make_local(env, h());
589 } else {
590 return NULL;
591 }
592 JVM_END
593
594 // Returns a java/lang/management/MemoryUsage object containing the memory usage
595 // of a given memory pool.
596 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
597 ResourceMark rm(THREAD);
598
599 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
600 if (pool != NULL) {
601 MemoryUsage usage = pool->get_peak_memory_usage();
602 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
603 return JNIHandles::make_local(env, h());
604 } else {
605 return NULL;
606 }
607 JVM_END
608
609 // Returns a java/lang/management/MemoryUsage object containing the memory usage
610 // of a given memory pool after most recent GC.
611 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
612 ResourceMark rm(THREAD);
613
614 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
615 if (pool != NULL && pool->is_collected_pool()) {
616 MemoryUsage usage = pool->get_last_collection_usage();
617 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
618 return JNIHandles::make_local(env, h());
619 } else {
620 return NULL;
621 }
622 JVM_END
623
624 // Sets the memory pool sensor for a threshold type
625 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
626 if (obj == NULL || sensorObj == NULL) {
627 THROW(vmSymbols::java_lang_NullPointerException());
628 }
629
630 InstanceKlass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
631 oop s = JNIHandles::resolve(sensorObj);
632 assert(s->is_instance(), "Sensor should be an instanceOop");
633 instanceHandle sensor_h(THREAD, (instanceOop) s);
634 if (!sensor_h->is_a(sensor_klass)) {
635 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
636 "Sensor is not an instance of sun.management.Sensor class");
637 }
638
639 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
640 assert(mpool != NULL, "MemoryPool should exist");
641
642 switch (type) {
643 case JMM_USAGE_THRESHOLD_HIGH:
644 case JMM_USAGE_THRESHOLD_LOW:
645 // have only one sensor for threshold high and low
646 mpool->set_usage_sensor_obj(sensor_h);
647 break;
648 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
649 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
650 // have only one sensor for threshold high and low
651 mpool->set_gc_usage_sensor_obj(sensor_h);
652 break;
653 default:
654 assert(false, "Unrecognized type");
655 }
656
657 JVM_END
658
659
660 // Sets the threshold of a given memory pool.
661 // Returns the previous threshold.
662 //
663 // Input parameters:
664 // pool - the MemoryPoolMXBean object
665 // type - threshold type
666 // threshold - the new threshold (must not be negative)
667 //
668 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
669 if (threshold < 0) {
670 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
671 "Invalid threshold value",
672 -1);
673 }
674
675 if ((size_t)threshold > max_uintx) {
676 stringStream st;
677 st.print("Invalid valid threshold value. Threshold value (" JLONG_FORMAT ") > max value of size_t (" UINTX_FORMAT ")", threshold, max_uintx);
678 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
679 }
680
681 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
682 assert(pool != NULL, "MemoryPool should exist");
683
684 jlong prev = 0;
685 switch (type) {
686 case JMM_USAGE_THRESHOLD_HIGH:
687 if (!pool->usage_threshold()->is_high_threshold_supported()) {
688 return -1;
689 }
690 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
691 break;
692
693 case JMM_USAGE_THRESHOLD_LOW:
694 if (!pool->usage_threshold()->is_low_threshold_supported()) {
695 return -1;
696 }
697 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
698 break;
699
700 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
701 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
702 return -1;
703 }
704 // return and the new threshold is effective for the next GC
705 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
706
707 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
708 if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
709 return -1;
710 }
711 // return and the new threshold is effective for the next GC
712 return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
713
714 default:
715 assert(false, "Unrecognized type");
716 return -1;
717 }
718
719 // When the threshold is changed, reevaluate if the low memory
720 // detection is enabled.
721 if (prev != threshold) {
722 LowMemoryDetector::recompute_enabled_for_collected_pools();
723 LowMemoryDetector::detect_low_memory(pool);
724 }
725 return prev;
726 JVM_END
727
728 // Returns a java/lang/management/MemoryUsage object representing
729 // the memory usage for the heap or non-heap memory.
730 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
731 ResourceMark rm(THREAD);
732
733 // Calculate the memory usage
734 size_t total_init = 0;
735 size_t total_used = 0;
736 size_t total_committed = 0;
737 size_t total_max = 0;
738 bool has_undefined_init_size = false;
739 bool has_undefined_max_size = false;
740
741 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
742 MemoryPool* pool = MemoryService::get_memory_pool(i);
743 if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
744 MemoryUsage u = pool->get_memory_usage();
745 total_used += u.used();
746 total_committed += u.committed();
747
748 if (u.init_size() == (size_t)-1) {
749 has_undefined_init_size = true;
750 }
751 if (!has_undefined_init_size) {
752 total_init += u.init_size();
753 }
754
755 if (u.max_size() == (size_t)-1) {
756 has_undefined_max_size = true;
757 }
758 if (!has_undefined_max_size) {
759 total_max += u.max_size();
760 }
761 }
762 }
763
764 // if any one of the memory pool has undefined init_size or max_size,
765 // set it to -1
766 if (has_undefined_init_size) {
767 total_init = (size_t)-1;
768 }
769 if (has_undefined_max_size) {
770 total_max = (size_t)-1;
771 }
772
773 MemoryUsage usage((heap ? InitialHeapSize : total_init),
774 total_used,
775 total_committed,
776 (heap ? Universe::heap()->max_capacity() : total_max));
777
778 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
779 return JNIHandles::make_local(env, obj());
780 JVM_END
781
782 // Returns the boolean value of a given attribute.
783 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
784 switch (att) {
785 case JMM_VERBOSE_GC:
786 return MemoryService::get_verbose();
787 case JMM_VERBOSE_CLASS:
788 return ClassLoadingService::get_verbose();
789 case JMM_THREAD_CONTENTION_MONITORING:
790 return ThreadService::is_thread_monitoring_contention();
791 case JMM_THREAD_CPU_TIME:
792 return ThreadService::is_thread_cpu_time_enabled();
793 case JMM_THREAD_ALLOCATED_MEMORY:
794 return ThreadService::is_thread_allocated_memory_enabled();
795 default:
796 assert(0, "Unrecognized attribute");
797 return false;
798 }
799 JVM_END
800
801 // Sets the given boolean attribute and returns the previous value.
802 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
803 switch (att) {
804 case JMM_VERBOSE_GC:
805 return MemoryService::set_verbose(flag != 0);
806 case JMM_VERBOSE_CLASS:
807 return ClassLoadingService::set_verbose(flag != 0);
808 case JMM_THREAD_CONTENTION_MONITORING:
809 return ThreadService::set_thread_monitoring_contention(flag != 0);
810 case JMM_THREAD_CPU_TIME:
811 return ThreadService::set_thread_cpu_time_enabled(flag != 0);
812 case JMM_THREAD_ALLOCATED_MEMORY:
813 return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
814 default:
815 assert(0, "Unrecognized attribute");
816 return false;
817 }
818 JVM_END
819
820
821 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
822 switch (att) {
823 case JMM_GC_TIME_MS:
824 return mgr->gc_time_ms();
825
826 case JMM_GC_COUNT:
827 return mgr->gc_count();
828
829 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
830 // current implementation only has 1 ext attribute
831 return 1;
832
833 default:
834 assert(0, "Unrecognized GC attribute");
835 return -1;
836 }
837 }
838
839 class VmThreadCountClosure: public ThreadClosure {
840 private:
841 int _count;
842 public:
843 VmThreadCountClosure() : _count(0) {};
844 void do_thread(Thread* thread);
845 int count() { return _count; }
846 };
847
848 void VmThreadCountClosure::do_thread(Thread* thread) {
849 // exclude externally visible JavaThreads
850 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
851 return;
852 }
853
854 _count++;
855 }
856
857 static jint get_vm_thread_count() {
858 VmThreadCountClosure vmtcc;
859 {
860 MutexLockerEx ml(Threads_lock);
861 Threads::threads_do(&vmtcc);
862 }
863
864 return vmtcc.count();
865 }
866
867 static jint get_num_flags() {
868 // last flag entry is always NULL, so subtract 1
869 int nFlags = (int) JVMFlag::numFlags - 1;
870 int count = 0;
871 for (int i = 0; i < nFlags; i++) {
872 JVMFlag* flag = &JVMFlag::flags[i];
873 // Exclude the locked (diagnostic, experimental) flags
874 if (flag->is_unlocked() || flag->is_unlocker()) {
875 count++;
876 }
877 }
878 return count;
879 }
880
881 static jlong get_long_attribute(jmmLongAttribute att) {
882 switch (att) {
883 case JMM_CLASS_LOADED_COUNT:
884 return ClassLoadingService::loaded_class_count();
885
886 case JMM_CLASS_UNLOADED_COUNT:
887 return ClassLoadingService::unloaded_class_count();
888
889 case JMM_THREAD_TOTAL_COUNT:
890 return ThreadService::get_total_thread_count();
891
892 case JMM_THREAD_LIVE_COUNT:
893 return ThreadService::get_live_thread_count();
894
895 case JMM_THREAD_PEAK_COUNT:
896 return ThreadService::get_peak_thread_count();
897
898 case JMM_THREAD_DAEMON_COUNT:
899 return ThreadService::get_daemon_thread_count();
900
901 case JMM_JVM_INIT_DONE_TIME_MS:
902 return Management::vm_init_done_time();
903
904 case JMM_JVM_UPTIME_MS:
905 return Management::ticks_to_ms(os::elapsed_counter());
906
907 case JMM_COMPILE_TOTAL_TIME_MS:
908 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
909
910 case JMM_OS_PROCESS_ID:
911 return os::current_process_id();
912
913 // Hotspot-specific counters
914 case JMM_CLASS_LOADED_BYTES:
915 return ClassLoadingService::loaded_class_bytes();
916
917 case JMM_CLASS_UNLOADED_BYTES:
918 return ClassLoadingService::unloaded_class_bytes();
919
920 case JMM_SHARED_CLASS_LOADED_COUNT:
921 return ClassLoadingService::loaded_shared_class_count();
922
923 case JMM_SHARED_CLASS_UNLOADED_COUNT:
924 return ClassLoadingService::unloaded_shared_class_count();
925
926
927 case JMM_SHARED_CLASS_LOADED_BYTES:
928 return ClassLoadingService::loaded_shared_class_bytes();
929
930 case JMM_SHARED_CLASS_UNLOADED_BYTES:
931 return ClassLoadingService::unloaded_shared_class_bytes();
932
933 case JMM_TOTAL_CLASSLOAD_TIME_MS:
934 return ClassLoader::classloader_time_ms();
935
936 case JMM_VM_GLOBAL_COUNT:
937 return get_num_flags();
938
939 case JMM_SAFEPOINT_COUNT:
940 return RuntimeService::safepoint_count();
941
942 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
943 return RuntimeService::safepoint_sync_time_ms();
944
945 case JMM_TOTAL_STOPPED_TIME_MS:
946 return RuntimeService::safepoint_time_ms();
947
948 case JMM_TOTAL_APP_TIME_MS:
949 return RuntimeService::application_time_ms();
950
951 case JMM_VM_THREAD_COUNT:
952 return get_vm_thread_count();
953
954 case JMM_CLASS_INIT_TOTAL_COUNT:
955 return ClassLoader::class_init_count();
956
957 case JMM_CLASS_INIT_TOTAL_TIME_MS:
958 return ClassLoader::class_init_time_ms();
959
960 case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
961 return ClassLoader::class_verify_time_ms();
962
963 case JMM_METHOD_DATA_SIZE_BYTES:
964 return ClassLoadingService::class_method_data_size();
965
966 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
967 return os::physical_memory();
968
969 default:
970 return -1;
971 }
972 }
973
974
975 // Returns the long value of a given attribute.
976 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
977 if (obj == NULL) {
978 return get_long_attribute(att);
979 } else {
980 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
981 if (mgr != NULL) {
982 return get_gc_attribute(mgr, att);
983 }
984 }
985 return -1;
986 JVM_END
987
988 // Gets the value of all attributes specified in the given array
989 // and sets the value in the result array.
990 // Returns the number of attributes found.
991 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
992 jobject obj,
993 jmmLongAttribute* atts,
994 jint count,
995 jlong* result))
996
997 int num_atts = 0;
998 if (obj == NULL) {
999 for (int i = 0; i < count; i++) {
1000 result[i] = get_long_attribute(atts[i]);
1001 if (result[i] != -1) {
1002 num_atts++;
1003 }
1004 }
1005 } else {
1006 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
1007 for (int i = 0; i < count; i++) {
1008 result[i] = get_gc_attribute(mgr, atts[i]);
1009 if (result[i] != -1) {
1010 num_atts++;
1011 }
1012 }
1013 }
1014 return num_atts;
1015 JVM_END
1016
1017 // Helper function to do thread dump for a specific list of threads
1018 static void do_thread_dump(ThreadDumpResult* dump_result,
1019 typeArrayHandle ids_ah, // array of thread ID (long[])
1020 int num_threads,
1021 int max_depth,
1022 bool with_locked_monitors,
1023 bool with_locked_synchronizers,
1024 TRAPS) {
1025 // no need to actually perform thread dump if no TIDs are specified
1026 if (num_threads == 0) return;
1027
1028 // First get an array of threadObj handles.
1029 // A JavaThread may terminate before we get the stack trace.
1030 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1031
1032 {
1033 // Need this ThreadsListHandle for converting Java thread IDs into
1034 // threadObj handles; dump_result->set_t_list() is called in the
1035 // VM op below so we can't use it yet.
1036 ThreadsListHandle tlh;
1037 for (int i = 0; i < num_threads; i++) {
1038 jlong tid = ids_ah->long_at(i);
1039 JavaThread* jt = tlh.list()->find_JavaThread_from_java_tid(tid);
1040 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1041 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1042 thread_handle_array->append(threadObj_h);
1043 }
1044 }
1045
1046 // Obtain thread dumps and thread snapshot information
1047 VM_ThreadDump op(dump_result,
1048 thread_handle_array,
1049 num_threads,
1050 max_depth, /* stack depth */
1051 with_locked_monitors,
1052 with_locked_synchronizers);
1053 VMThread::execute(&op);
1054 }
1055
1056 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1057 // for the thread ID specified in the corresponding entry in
1058 // the given array of thread IDs; or NULL if the thread does not exist
1059 // or has terminated.
1060 //
1061 // Input parameters:
1062 // ids - array of thread IDs
1063 // maxDepth - the maximum depth of stack traces to be dumped:
1064 // maxDepth == -1 requests to dump entire stack trace.
1065 // maxDepth == 0 requests no stack trace.
1066 // infoArray - array of ThreadInfo objects
1067 //
1068 // QQQ - Why does this method return a value instead of void?
1069 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1070 // Check if threads is null
1071 if (ids == NULL || infoArray == NULL) {
1072 THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1073 }
1074
1075 if (maxDepth < -1) {
1076 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1077 "Invalid maxDepth", -1);
1078 }
1079
1080 ResourceMark rm(THREAD);
1081 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1082 typeArrayHandle ids_ah(THREAD, ta);
1083
1084 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1085 objArrayOop oa = objArrayOop(infoArray_obj);
1086 objArrayHandle infoArray_h(THREAD, oa);
1087
1088 // validate the thread id array
1089 validate_thread_id_array(ids_ah, CHECK_0);
1090
1091 // validate the ThreadInfo[] parameters
1092 validate_thread_info_array(infoArray_h, CHECK_0);
1093
1094 // infoArray must be of the same length as the given array of thread IDs
1095 int num_threads = ids_ah->length();
1096 if (num_threads != infoArray_h->length()) {
1097 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1098 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1099 }
1100
1101 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1102 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1103
1104 // Must use ThreadDumpResult to store the ThreadSnapshot.
1105 // GC may occur after the thread snapshots are taken but before
1106 // this function returns. The threadObj and other oops kept
1107 // in the ThreadSnapshot are marked and adjusted during GC.
1108 ThreadDumpResult dump_result(num_threads);
1109
1110 if (maxDepth == 0) {
1111 // No stack trace to dump so we do not need to stop the world.
1112 // Since we never do the VM op here we must set the threads list.
1113 dump_result.set_t_list();
1114 for (int i = 0; i < num_threads; i++) {
1115 jlong tid = ids_ah->long_at(i);
1116 JavaThread* jt = dump_result.t_list()->find_JavaThread_from_java_tid(tid);
1117 ThreadSnapshot* ts;
1118 if (jt == NULL) {
1119 // if the thread does not exist or now it is terminated,
1120 // create dummy snapshot
1121 ts = new ThreadSnapshot();
1122 } else {
1123 ts = new ThreadSnapshot(dump_result.t_list(), jt);
1124 }
1125 dump_result.add_thread_snapshot(ts);
1126 }
1127 } else {
1128 // obtain thread dump with the specific list of threads with stack trace
1129 do_thread_dump(&dump_result,
1130 ids_ah,
1131 num_threads,
1132 maxDepth,
1133 false, /* no locked monitor */
1134 false, /* no locked synchronizers */
1135 CHECK_0);
1136 }
1137
1138 int num_snapshots = dump_result.num_snapshots();
1139 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1140 assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1141 int index = 0;
1142 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1143 // For each thread, create an java/lang/management/ThreadInfo object
1144 // and fill with the thread information
1145
1146 if (ts->threadObj() == NULL) {
1147 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1148 infoArray_h->obj_at_put(index, NULL);
1149 continue;
1150 }
1151
1152 // Create java.lang.management.ThreadInfo object
1153 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1154 infoArray_h->obj_at_put(index, info_obj);
1155 }
1156 return 0;
1157 JVM_END
1158
1159 // Dump thread info for the specified threads.
1160 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1161 // for the thread ID specified in the corresponding entry in
1162 // the given array of thread IDs; or NULL if the thread does not exist
1163 // or has terminated.
1164 //
1165 // Input parameter:
1166 // ids - array of thread IDs; NULL indicates all live threads
1167 // locked_monitors - if true, dump locked object monitors
1168 // locked_synchronizers - if true, dump locked JSR-166 synchronizers
1169 //
1170 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors,
1171 jboolean locked_synchronizers, jint maxDepth))
1172 ResourceMark rm(THREAD);
1173
1174 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1175 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1176
1177 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1178 int num_threads = (ta != NULL ? ta->length() : 0);
1179 typeArrayHandle ids_ah(THREAD, ta);
1180
1181 ThreadDumpResult dump_result(num_threads); // can safepoint
1182
1183 if (ids_ah() != NULL) {
1184
1185 // validate the thread id array
1186 validate_thread_id_array(ids_ah, CHECK_NULL);
1187
1188 // obtain thread dump of a specific list of threads
1189 do_thread_dump(&dump_result,
1190 ids_ah,
1191 num_threads,
1192 maxDepth, /* stack depth */
1193 (locked_monitors ? true : false), /* with locked monitors */
1194 (locked_synchronizers ? true : false), /* with locked synchronizers */
1195 CHECK_NULL);
1196 } else {
1197 // obtain thread dump of all threads
1198 VM_ThreadDump op(&dump_result,
1199 maxDepth, /* stack depth */
1200 (locked_monitors ? true : false), /* with locked monitors */
1201 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1202 VMThread::execute(&op);
1203 }
1204
1205 int num_snapshots = dump_result.num_snapshots();
1206 assert(num_snapshots == 0 || dump_result.t_list_has_been_set(), "ThreadsList must have been set if we have a snapshot");
1207
1208 // create the result ThreadInfo[] object
1209 InstanceKlass* ik = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1210 objArrayOop r = oopFactory::new_objArray(ik, num_snapshots, CHECK_NULL);
1211 objArrayHandle result_h(THREAD, r);
1212
1213 int index = 0;
1214 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1215 if (ts->threadObj() == NULL) {
1216 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1217 result_h->obj_at_put(index, NULL);
1218 continue;
1219 }
1220
1221 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1222 assert(stacktrace != NULL, "Must have a stack trace dumped");
1223
1224 // Create Object[] filled with locked monitors
1225 // Create int[] filled with the stack depth where a monitor was locked
1226 int num_frames = stacktrace->get_stack_depth();
1227 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1228
1229 // Count the total number of locked monitors
1230 for (int i = 0; i < num_frames; i++) {
1231 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1232 num_locked_monitors += frame->num_locked_monitors();
1233 }
1234
1235 objArrayHandle monitors_array;
1236 typeArrayHandle depths_array;
1237 objArrayHandle synchronizers_array;
1238
1239 if (locked_monitors) {
1240 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1241 // where the thread locked it
1242 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1243 objArrayHandle mh(THREAD, array);
1244 monitors_array = mh;
1245
1246 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1247 typeArrayHandle dh(THREAD, tarray);
1248 depths_array = dh;
1249
1250 int count = 0;
1251 int j = 0;
1252 for (int depth = 0; depth < num_frames; depth++) {
1253 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1254 int len = frame->num_locked_monitors();
1255 GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1256 for (j = 0; j < len; j++) {
1257 oop monitor = locked_monitors->at(j);
1258 assert(monitor != NULL, "must be a Java object");
1259 monitors_array->obj_at_put(count, monitor);
1260 depths_array->int_at_put(count, depth);
1261 count++;
1262 }
1263 }
1264
1265 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1266 for (j = 0; j < jni_locked_monitors->length(); j++) {
1267 oop object = jni_locked_monitors->at(j);
1268 assert(object != NULL, "must be a Java object");
1269 monitors_array->obj_at_put(count, object);
1270 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1271 depths_array->int_at_put(count, -1);
1272 count++;
1273 }
1274 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1275 }
1276
1277 if (locked_synchronizers) {
1278 // Create Object[] filled with locked JSR-166 synchronizers
1279 assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1280 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1281 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1282 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1283
1284 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1285 objArrayHandle sh(THREAD, array);
1286 synchronizers_array = sh;
1287
1288 for (int k = 0; k < num_locked_synchronizers; k++) {
1289 synchronizers_array->obj_at_put(k, locks->at(k));
1290 }
1291 }
1292
1293 // Create java.lang.management.ThreadInfo object
1294 instanceOop info_obj = Management::create_thread_info_instance(ts,
1295 monitors_array,
1296 depths_array,
1297 synchronizers_array,
1298 CHECK_NULL);
1299 result_h->obj_at_put(index, info_obj);
1300 }
1301
1302 return (jobjectArray) JNIHandles::make_local(env, result_h());
1303 JVM_END
1304
1305 // Reset statistic. Return true if the requested statistic is reset.
1306 // Otherwise, return false.
1307 //
1308 // Input parameters:
1309 // obj - specify which instance the statistic associated with to be reset
1310 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1311 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1312 // type - the type of statistic to be reset
1313 //
1314 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1315 ResourceMark rm(THREAD);
1316
1317 switch (type) {
1318 case JMM_STAT_PEAK_THREAD_COUNT:
1319 ThreadService::reset_peak_thread_count();
1320 return true;
1321
1322 case JMM_STAT_THREAD_CONTENTION_COUNT:
1323 case JMM_STAT_THREAD_CONTENTION_TIME: {
1324 jlong tid = obj.j;
1325 if (tid < 0) {
1326 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1327 }
1328
1329 // Look for the JavaThread of this given tid
1330 JavaThreadIteratorWithHandle jtiwh;
1331 if (tid == 0) {
1332 // reset contention statistics for all threads if tid == 0
1333 for (; JavaThread *java_thread = jtiwh.next(); ) {
1334 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1335 ThreadService::reset_contention_count_stat(java_thread);
1336 } else {
1337 ThreadService::reset_contention_time_stat(java_thread);
1338 }
1339 }
1340 } else {
1341 // reset contention statistics for a given thread
1342 JavaThread* java_thread = jtiwh.list()->find_JavaThread_from_java_tid(tid);
1343 if (java_thread == NULL) {
1344 return false;
1345 }
1346
1347 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1348 ThreadService::reset_contention_count_stat(java_thread);
1349 } else {
1350 ThreadService::reset_contention_time_stat(java_thread);
1351 }
1352 }
1353 return true;
1354 break;
1355 }
1356 case JMM_STAT_PEAK_POOL_USAGE: {
1357 jobject o = obj.l;
1358 if (o == NULL) {
1359 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1360 }
1361
1362 oop pool_obj = JNIHandles::resolve(o);
1363 assert(pool_obj->is_instance(), "Should be an instanceOop");
1364 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1365
1366 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1367 if (pool != NULL) {
1368 pool->reset_peak_memory_usage();
1369 return true;
1370 }
1371 break;
1372 }
1373 case JMM_STAT_GC_STAT: {
1374 jobject o = obj.l;
1375 if (o == NULL) {
1376 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1377 }
1378
1379 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1380 if (mgr != NULL) {
1381 mgr->reset_gc_stat();
1382 return true;
1383 }
1384 break;
1385 }
1386 default:
1387 assert(0, "Unknown Statistic Type");
1388 }
1389 return false;
1390 JVM_END
1391
1392 // Returns the fast estimate of CPU time consumed by
1393 // a given thread (in nanoseconds).
1394 // If thread_id == 0, return CPU time for the current thread.
1395 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1396 if (!os::is_thread_cpu_time_supported()) {
1397 return -1;
1398 }
1399
1400 if (thread_id < 0) {
1401 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1402 "Invalid thread ID", -1);
1403 }
1404
1405 JavaThread* java_thread = NULL;
1406 if (thread_id == 0) {
1407 // current thread
1408 return os::current_thread_cpu_time();
1409 } else {
1410 ThreadsListHandle tlh;
1411 java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
1412 if (java_thread != NULL) {
1413 return os::thread_cpu_time((Thread*) java_thread);
1414 }
1415 }
1416 return -1;
1417 JVM_END
1418
1419 // Returns a String array of all VM global flag names
1420 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1421 // last flag entry is always NULL, so subtract 1
1422 int nFlags = (int) JVMFlag::numFlags - 1;
1423 // allocate a temp array
1424 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1425 nFlags, CHECK_0);
1426 objArrayHandle flags_ah(THREAD, r);
1427 int num_entries = 0;
1428 for (int i = 0; i < nFlags; i++) {
1429 JVMFlag* flag = &JVMFlag::flags[i];
1430 // Exclude notproduct and develop flags in product builds.
1431 if (flag->is_constant_in_binary()) {
1432 continue;
1433 }
1434 // Exclude the locked (experimental, diagnostic) flags
1435 if (flag->is_unlocked() || flag->is_unlocker()) {
1436 Handle s = java_lang_String::create_from_str(flag->_name, CHECK_0);
1437 flags_ah->obj_at_put(num_entries, s());
1438 num_entries++;
1439 }
1440 }
1441
1442 if (num_entries < nFlags) {
1443 // Return array of right length
1444 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1445 for(int i = 0; i < num_entries; i++) {
1446 res->obj_at_put(i, flags_ah->obj_at(i));
1447 }
1448 return (jobjectArray)JNIHandles::make_local(env, res);
1449 }
1450
1451 return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1452 JVM_END
1453
1454 // Utility function used by jmm_GetVMGlobals. Returns false if flag type
1455 // can't be determined, true otherwise. If false is returned, then *global
1456 // will be incomplete and invalid.
1457 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, JVMFlag *flag, TRAPS) {
1458 Handle flag_name;
1459 if (name() == NULL) {
1460 flag_name = java_lang_String::create_from_str(flag->_name, CHECK_false);
1461 } else {
1462 flag_name = name;
1463 }
1464 global->name = (jstring)JNIHandles::make_local(env, flag_name());
1465
1466 if (flag->is_bool()) {
1467 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1468 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1469 } else if (flag->is_int()) {
1470 global->value.j = (jlong)flag->get_int();
1471 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1472 } else if (flag->is_uint()) {
1473 global->value.j = (jlong)flag->get_uint();
1474 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1475 } else if (flag->is_intx()) {
1476 global->value.j = (jlong)flag->get_intx();
1477 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1478 } else if (flag->is_uintx()) {
1479 global->value.j = (jlong)flag->get_uintx();
1480 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1481 } else if (flag->is_uint64_t()) {
1482 global->value.j = (jlong)flag->get_uint64_t();
1483 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1484 } else if (flag->is_double()) {
1485 global->value.d = (jdouble)flag->get_double();
1486 global->type = JMM_VMGLOBAL_TYPE_JDOUBLE;
1487 } else if (flag->is_size_t()) {
1488 global->value.j = (jlong)flag->get_size_t();
1489 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1490 } else if (flag->is_ccstr()) {
1491 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1492 global->value.l = (jobject)JNIHandles::make_local(env, str());
1493 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1494 } else {
1495 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1496 return false;
1497 }
1498
1499 global->writeable = flag->is_writeable();
1500 global->external = flag->is_external();
1501 switch (flag->get_origin()) {
1502 case JVMFlag::DEFAULT:
1503 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1504 break;
1505 case JVMFlag::COMMAND_LINE:
1506 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1507 break;
1508 case JVMFlag::ENVIRON_VAR:
1509 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1510 break;
1511 case JVMFlag::CONFIG_FILE:
1512 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1513 break;
1514 case JVMFlag::MANAGEMENT:
1515 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1516 break;
1517 case JVMFlag::ERGONOMIC:
1518 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1519 break;
1520 case JVMFlag::ATTACH_ON_DEMAND:
1521 global->origin = JMM_VMGLOBAL_ORIGIN_ATTACH_ON_DEMAND;
1522 break;
1523 default:
1524 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1525 }
1526
1527 return true;
1528 }
1529
1530 // Fill globals array of count length with jmmVMGlobal entries
1531 // specified by names. If names == NULL, fill globals array
1532 // with all Flags. Return value is number of entries
1533 // created in globals.
1534 // If a JVMFlag with a given name in an array element does not
1535 // exist, globals[i].name will be set to NULL.
1536 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1537 jobjectArray names,
1538 jmmVMGlobal *globals,
1539 jint count))
1540
1541
1542 if (globals == NULL) {
1543 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1544 }
1545
1546 ResourceMark rm(THREAD);
1547
1548 if (names != NULL) {
1549 // return the requested globals
1550 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1551 objArrayHandle names_ah(THREAD, ta);
1552 // Make sure we have a String array
1553 Klass* element_klass = ObjArrayKlass::cast(names_ah->klass())->element_klass();
1554 if (element_klass != SystemDictionary::String_klass()) {
1555 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1556 "Array element type is not String class", 0);
1557 }
1558
1559 int names_length = names_ah->length();
1560 int num_entries = 0;
1561 for (int i = 0; i < names_length && i < count; i++) {
1562 oop s = names_ah->obj_at(i);
1563 if (s == NULL) {
1564 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1565 }
1566
1567 Handle sh(THREAD, s);
1568 char* str = java_lang_String::as_utf8_string(s);
1569 JVMFlag* flag = JVMFlag::find_flag(str, strlen(str));
1570 if (flag != NULL &&
1571 add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1572 num_entries++;
1573 } else {
1574 globals[i].name = NULL;
1575 }
1576 }
1577 return num_entries;
1578 } else {
1579 // return all globals if names == NULL
1580
1581 // last flag entry is always NULL, so subtract 1
1582 int nFlags = (int) JVMFlag::numFlags - 1;
1583 Handle null_h;
1584 int num_entries = 0;
1585 for (int i = 0; i < nFlags && num_entries < count; i++) {
1586 JVMFlag* flag = &JVMFlag::flags[i];
1587 // Exclude notproduct and develop flags in product builds.
1588 if (flag->is_constant_in_binary()) {
1589 continue;
1590 }
1591 // Exclude the locked (diagnostic, experimental) flags
1592 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1593 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1594 num_entries++;
1595 }
1596 }
1597 return num_entries;
1598 }
1599 JVM_END
1600
1601 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1602 ResourceMark rm(THREAD);
1603
1604 oop fn = JNIHandles::resolve_external_guard(flag_name);
1605 if (fn == NULL) {
1606 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1607 "The flag name cannot be null.");
1608 }
1609 char* name = java_lang_String::as_utf8_string(fn);
1610
1611 FormatBuffer<80> error_msg("%s", "");
1612 int succeed = WriteableFlags::set_flag(name, new_value, JVMFlag::MANAGEMENT, error_msg);
1613
1614 if (succeed != JVMFlag::SUCCESS) {
1615 if (succeed == JVMFlag::MISSING_VALUE) {
1616 // missing value causes NPE to be thrown
1617 THROW(vmSymbols::java_lang_NullPointerException());
1618 } else {
1619 // all the other errors are reported as IAE with the appropriate error message
1620 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1621 error_msg.buffer());
1622 }
1623 }
1624 assert(succeed == JVMFlag::SUCCESS, "Setting flag should succeed");
1625 JVM_END
1626
1627 class ThreadTimesClosure: public ThreadClosure {
1628 private:
1629 objArrayHandle _names_strings;
1630 char **_names_chars;
1631 typeArrayHandle _times;
1632 int _names_len;
1633 int _times_len;
1634 int _count;
1635
1636 public:
1637 ThreadTimesClosure(objArrayHandle names, typeArrayHandle times);
1638 ~ThreadTimesClosure();
1639 virtual void do_thread(Thread* thread);
1640 void do_unlocked();
1641 int count() { return _count; }
1642 };
1643
1644 ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1645 typeArrayHandle times) {
1646 assert(names() != NULL, "names was NULL");
1647 assert(times() != NULL, "times was NULL");
1648 _names_strings = names;
1649 _names_len = names->length();
1650 _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1651 _times = times;
1652 _times_len = times->length();
1653 _count = 0;
1654 }
1655
1656 //
1657 // Called with Threads_lock held
1658 //
1659 void ThreadTimesClosure::do_thread(Thread* thread) {
1660 assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
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 Handle onhandle(THREAD, on);
1942 char* name = java_lang_String::as_platform_dependent_str(onhandle, CHECK_(-1));
1943 if (name == NULL) {
1944 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
1945 "Output file name cannot be null.", -1);
1946 }
1947 HeapDumper dumper(live ? true : false);
1948 if (dumper.dump(name) != 0) {
1949 const char* errmsg = dumper.error_as_C_string();
1950 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
1951 }
1952 return 0;
1953 #else // INCLUDE_SERVICES
1954 return -1;
1955 #endif // INCLUDE_SERVICES
1956 JVM_END
1957
1958 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
1959 ResourceMark rm(THREAD);
1960 GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list(DCmd_Source_MBean);
1961 objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
1962 dcmd_list->length(), CHECK_NULL);
1963 objArrayHandle cmd_array(THREAD, cmd_array_oop);
1964 for (int i = 0; i < dcmd_list->length(); i++) {
1965 oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
1966 cmd_array->obj_at_put(i, cmd_name);
1967 }
1968 return (jobjectArray) JNIHandles::make_local(env, cmd_array());
1969 JVM_END
1970
1971 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
1972 dcmdInfo* infoArray))
1973 if (cmds == NULL || infoArray == NULL) {
1974 THROW(vmSymbols::java_lang_NullPointerException());
1975 }
1976
1977 ResourceMark rm(THREAD);
1978
1979 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
1980 objArrayHandle cmds_ah(THREAD, ca);
1981
1982 // Make sure we have a String array
1983 Klass* element_klass = ObjArrayKlass::cast(cmds_ah->klass())->element_klass();
1984 if (element_klass != SystemDictionary::String_klass()) {
1985 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1986 "Array element type is not String class");
1987 }
1988
1989 GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list(DCmd_Source_MBean);
1990
1991 int num_cmds = cmds_ah->length();
1992 for (int i = 0; i < num_cmds; i++) {
1993 oop cmd = cmds_ah->obj_at(i);
1994 if (cmd == NULL) {
1995 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1996 "Command name cannot be null.");
1997 }
1998 char* cmd_name = java_lang_String::as_utf8_string(cmd);
1999 if (cmd_name == NULL) {
2000 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2001 "Command name cannot be null.");
2002 }
2003 int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
2004 if (pos == -1) {
2005 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2006 "Unknown diagnostic command");
2007 }
2008 DCmdInfo* info = info_list->at(pos);
2009 infoArray[i].name = info->name();
2010 infoArray[i].description = info->description();
2011 infoArray[i].impact = info->impact();
2012 JavaPermission p = info->permission();
2013 infoArray[i].permission_class = p._class;
2014 infoArray[i].permission_name = p._name;
2015 infoArray[i].permission_action = p._action;
2016 infoArray[i].num_arguments = info->num_arguments();
2017 infoArray[i].enabled = info->is_enabled();
2018 }
2019 JVM_END
2020
2021 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2022 jstring command, dcmdArgInfo* infoArray))
2023 ResourceMark rm(THREAD);
2024 oop cmd = JNIHandles::resolve_external_guard(command);
2025 if (cmd == NULL) {
2026 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2027 "Command line cannot be null.");
2028 }
2029 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2030 if (cmd_name == NULL) {
2031 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2032 "Command line content cannot be null.");
2033 }
2034 DCmd* dcmd = NULL;
2035 DCmdFactory*factory = DCmdFactory::factory(DCmd_Source_MBean, cmd_name,
2036 strlen(cmd_name));
2037 if (factory != NULL) {
2038 dcmd = factory->create_resource_instance(NULL);
2039 }
2040 if (dcmd == NULL) {
2041 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2042 "Unknown diagnostic command");
2043 }
2044 DCmdMark mark(dcmd);
2045 GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2046 if (array->length() == 0) {
2047 return;
2048 }
2049 for (int i = 0; i < array->length(); i++) {
2050 infoArray[i].name = array->at(i)->name();
2051 infoArray[i].description = array->at(i)->description();
2052 infoArray[i].type = array->at(i)->type();
2053 infoArray[i].default_string = array->at(i)->default_string();
2054 infoArray[i].mandatory = array->at(i)->is_mandatory();
2055 infoArray[i].option = array->at(i)->is_option();
2056 infoArray[i].multiple = array->at(i)->is_multiple();
2057 infoArray[i].position = array->at(i)->position();
2058 }
2059 return;
2060 JVM_END
2061
2062 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2063 ResourceMark rm(THREAD);
2064 oop cmd = JNIHandles::resolve_external_guard(commandline);
2065 if (cmd == NULL) {
2066 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2067 "Command line cannot be null.");
2068 }
2069 char* cmdline = java_lang_String::as_utf8_string(cmd);
2070 if (cmdline == NULL) {
2071 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2072 "Command line content cannot be null.");
2073 }
2074 bufferedStream output;
2075 DCmd::parse_and_execute(DCmd_Source_MBean, &output, cmdline, ' ', CHECK_NULL);
2076 oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2077 return (jstring) JNIHandles::make_local(env, result);
2078 JVM_END
2079
2080 JVM_ENTRY(void, jmm_SetDiagnosticFrameworkNotificationEnabled(JNIEnv *env, jboolean enabled))
2081 DCmdFactory::set_jmx_notification_enabled(enabled?true:false);
2082 JVM_END
2083
2084 jlong Management::ticks_to_ms(jlong ticks) {
2085 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2086 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2087 * (double)1000.0);
2088 }
2089 #endif // INCLUDE_MANAGEMENT
2090
2091 // Gets an array containing the amount of memory allocated on the Java
2092 // heap for a set of threads (in bytes). Each element of the array is
2093 // the amount of memory allocated for the thread ID specified in the
2094 // corresponding entry in the given array of thread IDs; or -1 if the
2095 // thread does not exist or has terminated.
2096 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
2097 jlongArray sizeArray))
2098 // Check if threads is null
2099 if (ids == NULL || sizeArray == NULL) {
2100 THROW(vmSymbols::java_lang_NullPointerException());
2101 }
2102
2103 ResourceMark rm(THREAD);
2104 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2105 typeArrayHandle ids_ah(THREAD, ta);
2106
2107 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
2108 typeArrayHandle sizeArray_h(THREAD, sa);
2109
2110 // validate the thread id array
2111 validate_thread_id_array(ids_ah, CHECK);
2112
2113 // sizeArray must be of the same length as the given array of thread IDs
2114 int num_threads = ids_ah->length();
2115 if (num_threads != sizeArray_h->length()) {
2116 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2117 "The length of the given long array does not match the length of "
2118 "the given array of thread IDs");
2119 }
2120
2121 ThreadsListHandle tlh;
2122 for (int i = 0; i < num_threads; i++) {
2123 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2124 if (java_thread != NULL) {
2125 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
2126 }
2127 }
2128 JVM_END
2129
2130 // Returns the CPU time consumed by a given thread (in nanoseconds).
2131 // If thread_id == 0, CPU time for the current thread is returned.
2132 // If user_sys_cpu_time = true, user level and system CPU time of
2133 // a given thread is returned; otherwise, only user level CPU time
2134 // is returned.
2135 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
2136 if (!os::is_thread_cpu_time_supported()) {
2137 return -1;
2138 }
2139
2140 if (thread_id < 0) {
2141 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2142 "Invalid thread ID", -1);
2143 }
2144
2145 JavaThread* java_thread = NULL;
2146 if (thread_id == 0) {
2147 // current thread
2148 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
2149 } else {
2150 ThreadsListHandle tlh;
2151 java_thread = tlh.list()->find_JavaThread_from_java_tid(thread_id);
2152 if (java_thread != NULL) {
2153 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
2154 }
2155 }
2156 return -1;
2157 JVM_END
2158
2159 // Gets an array containing the CPU times consumed by a set of threads
2160 // (in nanoseconds). Each element of the array is the CPU time for the
2161 // thread ID specified in the corresponding entry in the given array
2162 // of thread IDs; or -1 if the thread does not exist or has terminated.
2163 // If user_sys_cpu_time = true, the sum of user level and system CPU time
2164 // for the given thread is returned; otherwise, only user level CPU time
2165 // is returned.
2166 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
2167 jlongArray timeArray,
2168 jboolean user_sys_cpu_time))
2169 // Check if threads is null
2170 if (ids == NULL || timeArray == NULL) {
2171 THROW(vmSymbols::java_lang_NullPointerException());
2172 }
2173
2174 ResourceMark rm(THREAD);
2175 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
2176 typeArrayHandle ids_ah(THREAD, ta);
2177
2178 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
2179 typeArrayHandle timeArray_h(THREAD, tia);
2180
2181 // validate the thread id array
2182 validate_thread_id_array(ids_ah, CHECK);
2183
2184 // timeArray must be of the same length as the given array of thread IDs
2185 int num_threads = ids_ah->length();
2186 if (num_threads != timeArray_h->length()) {
2187 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2188 "The length of the given long array does not match the length of "
2189 "the given array of thread IDs");
2190 }
2191
2192 ThreadsListHandle tlh;
2193 for (int i = 0; i < num_threads; i++) {
2194 JavaThread* java_thread = tlh.list()->find_JavaThread_from_java_tid(ids_ah->long_at(i));
2195 if (java_thread != NULL) {
2196 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
2197 user_sys_cpu_time != 0));
2198 }
2199 }
2200 JVM_END
2201
2202
2203
2204 #if INCLUDE_MANAGEMENT
2205 const struct jmmInterface_1_ jmm_interface = {
2206 NULL,
2207 NULL,
2208 jmm_GetVersion,
2209 jmm_GetOptionalSupport,
2210 jmm_GetThreadInfo,
2211 jmm_GetMemoryPools,
2212 jmm_GetMemoryManagers,
2213 jmm_GetMemoryPoolUsage,
2214 jmm_GetPeakMemoryPoolUsage,
2215 jmm_GetThreadAllocatedMemory,
2216 jmm_GetMemoryUsage,
2217 jmm_GetLongAttribute,
2218 jmm_GetBoolAttribute,
2219 jmm_SetBoolAttribute,
2220 jmm_GetLongAttributes,
2221 jmm_FindMonitorDeadlockedThreads,
2222 jmm_GetThreadCpuTime,
2223 jmm_GetVMGlobalNames,
2224 jmm_GetVMGlobals,
2225 jmm_GetInternalThreadTimes,
2226 jmm_ResetStatistic,
2227 jmm_SetPoolSensor,
2228 jmm_SetPoolThreshold,
2229 jmm_GetPoolCollectionUsage,
2230 jmm_GetGCExtAttributeInfo,
2231 jmm_GetLastGCStat,
2232 jmm_GetThreadCpuTimeWithKind,
2233 jmm_GetThreadCpuTimesWithKind,
2234 jmm_DumpHeap0,
2235 jmm_FindDeadlockedThreads,
2236 jmm_SetVMGlobal,
2237 NULL,
2238 jmm_DumpThreads,
2239 jmm_SetGCNotificationEnabled,
2240 jmm_GetDiagnosticCommands,
2241 jmm_GetDiagnosticCommandInfo,
2242 jmm_GetDiagnosticCommandArgumentsInfo,
2243 jmm_ExecuteDiagnosticCommand,
2244 jmm_SetDiagnosticFrameworkNotificationEnabled
2245 };
2246 #endif // INCLUDE_MANAGEMENT
2247
2248 void* Management::get_jmm_interface(int version) {
2249 #if INCLUDE_MANAGEMENT
2250 if (version == JMM_VERSION) {
2251 return (void*) &jmm_interface;
2252 }
2253 #endif // INCLUDE_MANAGEMENT
2254 return NULL;
2255 }