1 /*
2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "compiler/compileBroker.hpp"
28 #include "memory/iterator.hpp"
29 #include "memory/oopFactory.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "oops/klass.hpp"
32 #include "oops/klassOop.hpp"
33 #include "oops/objArrayKlass.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/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 "services/classLoadingService.hpp"
44 #include "services/diagnosticCommand.hpp"
45 #include "services/diagnosticFramework.hpp"
46 #include "services/heapDumper.hpp"
47 #include "services/jmm.h"
48 #include "services/lowMemoryDetector.hpp"
49 #include "services/gcNotifier.hpp"
50 #include "services/nmtDCmd.hpp"
51 #include "services/management.hpp"
52 #include "services/memoryManager.hpp"
53 #include "services/memoryPool.hpp"
54 #include "services/memoryService.hpp"
55 #include "services/runtimeService.hpp"
56 #include "services/threadService.hpp"
57
58 PerfVariable* Management::_begin_vm_creation_time = NULL;
59 PerfVariable* Management::_end_vm_creation_time = NULL;
60 PerfVariable* Management::_vm_init_done_time = NULL;
61
62 klassOop Management::_sensor_klass = NULL;
63 klassOop Management::_threadInfo_klass = NULL;
64 klassOop Management::_memoryUsage_klass = NULL;
65 klassOop Management::_memoryPoolMXBean_klass = NULL;
66 klassOop Management::_memoryManagerMXBean_klass = NULL;
67 klassOop Management::_garbageCollectorMXBean_klass = NULL;
68 klassOop Management::_managementFactory_klass = NULL;
69 klassOop Management::_garbageCollectorImpl_klass = NULL;
70 klassOop Management::_gcInfo_klass = NULL;
71
72 jmmOptionalSupport Management::_optional_support = {0};
73 TimeStamp Management::_stamp;
74
75 void management_init() {
76 Management::init();
77 ThreadService::init();
78 RuntimeService::init();
79 ClassLoadingService::init();
80 }
81
82 void Management::init() {
83 EXCEPTION_MARK;
84
85 // These counters are for java.lang.management API support.
86 // They are created even if -XX:-UsePerfData is set and in
87 // that case, they will be allocated on C heap.
88
89 _begin_vm_creation_time =
90 PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
91 PerfData::U_None, CHECK);
92
93 _end_vm_creation_time =
94 PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
95 PerfData::U_None, CHECK);
96
97 _vm_init_done_time =
98 PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
99 PerfData::U_None, CHECK);
100
101 // Initialize optional support
102 _optional_support.isLowMemoryDetectionSupported = 1;
103 _optional_support.isCompilationTimeMonitoringSupported = 1;
104 _optional_support.isThreadContentionMonitoringSupported = 1;
105
106 if (os::is_thread_cpu_time_supported()) {
107 _optional_support.isCurrentThreadCpuTimeSupported = 1;
108 _optional_support.isOtherThreadCpuTimeSupported = 1;
109 } else {
110 _optional_support.isCurrentThreadCpuTimeSupported = 0;
111 _optional_support.isOtherThreadCpuTimeSupported = 0;
112 }
113
114 _optional_support.isBootClassPathSupported = 1;
115 _optional_support.isObjectMonitorUsageSupported = 1;
116 // This depends on the heap inspector
117 _optional_support.isSynchronizerUsageSupported = 1;
118 _optional_support.isThreadAllocatedMemorySupported = 1;
119
120 // Registration of the diagnostic commands
121 DCmdRegistrant::register_dcmds();
122 DCmdRegistrant::register_dcmds_ext();
123 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(true, false));
124 }
125
126 void Management::initialize(TRAPS) {
127 // Start the service thread
128 ServiceThread::initialize();
129
130 if (ManagementServer) {
131 ResourceMark rm(THREAD);
132 HandleMark hm(THREAD);
133
134 // Load and initialize the sun.management.Agent class
135 // invoke startAgent method to start the management server
136 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
137 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::sun_management_Agent(),
138 loader,
139 Handle(),
140 true,
141 CHECK);
142 instanceKlassHandle ik (THREAD, k);
143
144 JavaValue result(T_VOID);
145 JavaCalls::call_static(&result,
146 ik,
147 vmSymbols::startAgent_name(),
148 vmSymbols::void_method_signature(),
149 CHECK);
150 }
151 }
152
153 void Management::get_optional_support(jmmOptionalSupport* support) {
154 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
155 }
156
157 klassOop Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
158 klassOop k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
159 instanceKlassHandle ik (THREAD, k);
160 if (ik->should_be_initialized()) {
161 ik->initialize(CHECK_NULL);
162 }
163 return ik();
164 }
165
166 void Management::record_vm_startup_time(jlong begin, jlong duration) {
167 // if the performance counter is not initialized,
168 // then vm initialization failed; simply return.
169 if (_begin_vm_creation_time == NULL) return;
170
171 _begin_vm_creation_time->set_value(begin);
172 _end_vm_creation_time->set_value(begin + duration);
173 PerfMemory::set_accessible(true);
174 }
175
176 jlong Management::timestamp() {
177 TimeStamp t;
178 t.update();
179 return t.ticks() - _stamp.ticks();
180 }
181
182 void Management::oops_do(OopClosure* f) {
183 MemoryService::oops_do(f);
184 ThreadService::oops_do(f);
185
186 f->do_oop((oop*) &_sensor_klass);
187 f->do_oop((oop*) &_threadInfo_klass);
188 f->do_oop((oop*) &_memoryUsage_klass);
189 f->do_oop((oop*) &_memoryPoolMXBean_klass);
190 f->do_oop((oop*) &_memoryManagerMXBean_klass);
191 f->do_oop((oop*) &_garbageCollectorMXBean_klass);
192 f->do_oop((oop*) &_managementFactory_klass);
193 f->do_oop((oop*) &_garbageCollectorImpl_klass);
194 f->do_oop((oop*) &_gcInfo_klass);
195 }
196
197 klassOop Management::java_lang_management_ThreadInfo_klass(TRAPS) {
198 if (_threadInfo_klass == NULL) {
199 _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
200 }
201 return _threadInfo_klass;
202 }
203
204 klassOop Management::java_lang_management_MemoryUsage_klass(TRAPS) {
205 if (_memoryUsage_klass == NULL) {
206 _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
207 }
208 return _memoryUsage_klass;
209 }
210
211 klassOop Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
212 if (_memoryPoolMXBean_klass == NULL) {
213 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
214 }
215 return _memoryPoolMXBean_klass;
216 }
217
218 klassOop Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
219 if (_memoryManagerMXBean_klass == NULL) {
220 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
221 }
222 return _memoryManagerMXBean_klass;
223 }
224
225 klassOop Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
226 if (_garbageCollectorMXBean_klass == NULL) {
227 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
228 }
229 return _garbageCollectorMXBean_klass;
230 }
231
232 klassOop Management::sun_management_Sensor_klass(TRAPS) {
233 if (_sensor_klass == NULL) {
234 _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
235 }
236 return _sensor_klass;
237 }
238
239 klassOop Management::sun_management_ManagementFactory_klass(TRAPS) {
240 if (_managementFactory_klass == NULL) {
241 _managementFactory_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactory(), CHECK_NULL);
242 }
243 return _managementFactory_klass;
244 }
245
246 klassOop Management::sun_management_GarbageCollectorImpl_klass(TRAPS) {
247 if (_garbageCollectorImpl_klass == NULL) {
248 _garbageCollectorImpl_klass = load_and_initialize_klass(vmSymbols::sun_management_GarbageCollectorImpl(), CHECK_NULL);
249 }
250 return _garbageCollectorImpl_klass;
251 }
252
253 klassOop Management::com_sun_management_GcInfo_klass(TRAPS) {
254 if (_gcInfo_klass == NULL) {
255 _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
256 }
257 return _gcInfo_klass;
258 }
259
260 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
261 Handle snapshot_thread(THREAD, snapshot->threadObj());
262
263 jlong contended_time;
264 jlong waited_time;
265 if (ThreadService::is_thread_monitoring_contention()) {
266 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
267 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
268 } else {
269 // set them to -1 if thread contention monitoring is disabled.
270 contended_time = max_julong;
271 waited_time = max_julong;
272 }
273
274 int thread_status = snapshot->thread_status();
275 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
276 if (snapshot->is_ext_suspended()) {
277 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
278 }
279 if (snapshot->is_in_native()) {
280 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
281 }
282
283 ThreadStackTrace* st = snapshot->get_stack_trace();
284 Handle stacktrace_h;
285 if (st != NULL) {
286 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
287 } else {
288 stacktrace_h = Handle();
289 }
290
291 args->push_oop(snapshot_thread);
292 args->push_int(thread_status);
293 args->push_oop(Handle(THREAD, snapshot->blocker_object()));
294 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
295 args->push_long(snapshot->contended_enter_count());
296 args->push_long(contended_time);
297 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
298 args->push_long(waited_time);
299 args->push_oop(stacktrace_h);
300 }
301
302 // Helper function to construct a ThreadInfo object
303 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
304 klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
305 instanceKlassHandle ik (THREAD, k);
306
307 JavaValue result(T_VOID);
308 JavaCallArguments args(14);
309
310 // First allocate a ThreadObj object and
311 // push the receiver as the first argument
312 Handle element = ik->allocate_instance_handle(CHECK_NULL);
313 args.push_oop(element);
314
315 // initialize the arguments for the ThreadInfo constructor
316 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
317
318 // Call ThreadInfo constructor with no locked monitors and synchronizers
319 JavaCalls::call_special(&result,
320 ik,
321 vmSymbols::object_initializer_name(),
322 vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
323 &args,
324 CHECK_NULL);
325
326 return (instanceOop) element();
327 }
328
329 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
330 objArrayHandle monitors_array,
331 typeArrayHandle depths_array,
332 objArrayHandle synchronizers_array,
333 TRAPS) {
334 klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
335 instanceKlassHandle ik (THREAD, k);
336
337 JavaValue result(T_VOID);
338 JavaCallArguments args(17);
339
340 // First allocate a ThreadObj object and
341 // push the receiver as the first argument
342 Handle element = ik->allocate_instance_handle(CHECK_NULL);
343 args.push_oop(element);
344
345 // initialize the arguments for the ThreadInfo constructor
346 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
347
348 // push the locked monitors and synchronizers in the arguments
349 args.push_oop(monitors_array);
350 args.push_oop(depths_array);
351 args.push_oop(synchronizers_array);
352
353 // Call ThreadInfo constructor with locked monitors and synchronizers
354 JavaCalls::call_special(&result,
355 ik,
356 vmSymbols::object_initializer_name(),
357 vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
358 &args,
359 CHECK_NULL);
360
361 return (instanceOop) element();
362 }
363
364 // Helper functions
365 static JavaThread* find_java_thread_from_id(jlong thread_id) {
366 assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
367
368 JavaThread* java_thread = NULL;
369 // Sequential search for now. Need to do better optimization later.
370 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
371 oop tobj = thread->threadObj();
372 if (!thread->is_exiting() &&
373 tobj != NULL &&
374 thread_id == java_lang_Thread::thread_id(tobj)) {
375 java_thread = thread;
376 break;
377 }
378 }
379 return java_thread;
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 klassOop 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 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
418 int num_threads = ids_ah->length();
419
420 // Validate input thread IDs
421 int i = 0;
422 for (i = 0; i < num_threads; i++) {
423 jlong tid = ids_ah->long_at(i);
424 if (tid <= 0) {
425 // throw exception if invalid thread id.
426 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
427 "Invalid thread ID entry");
428 }
429 }
430 }
431
432 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
433 // check if the element of infoArray is of type ThreadInfo class
434 klassOop threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
435 klassOop element_klass = objArrayKlass::cast(infoArray_h->klass())->element_klass();
436 if (element_klass != threadinfo_klass) {
437 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
438 "infoArray element type is not ThreadInfo class");
439 }
440 }
441
442
443 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
444 if (obj == NULL) {
445 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
446 }
447
448 oop mgr_obj = JNIHandles::resolve(obj);
449 assert(mgr_obj->is_instance(), "Should be an instanceOop");
450 instanceHandle mh(THREAD, (instanceOop) mgr_obj);
451
452 return MemoryService::get_memory_manager(mh);
453 }
454
455 // Returns a version string and sets major and minor version if
456 // the input parameters are non-null.
457 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
458 return JMM_VERSION;
459 JVM_END
460
461 // Gets the list of VM monitoring and management optional supports
462 // Returns 0 if succeeded; otherwise returns non-zero.
463 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
464 if (support == NULL) {
465 return -1;
466 }
467 Management::get_optional_support(support);
468 return 0;
469 JVM_END
470
471 // Returns a java.lang.String object containing the input arguments to the VM.
472 JVM_ENTRY(jobject, jmm_GetInputArguments(JNIEnv *env))
473 ResourceMark rm(THREAD);
474
475 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
476 return NULL;
477 }
478
479 char** vm_flags = Arguments::jvm_flags_array();
480 char** vm_args = Arguments::jvm_args_array();
481 int num_flags = Arguments::num_jvm_flags();
482 int num_args = Arguments::num_jvm_args();
483
484 size_t length = 1; // null terminator
485 int i;
486 for (i = 0; i < num_flags; i++) {
487 length += strlen(vm_flags[i]);
488 }
489 for (i = 0; i < num_args; i++) {
490 length += strlen(vm_args[i]);
491 }
492 // add a space between each argument
493 length += num_flags + num_args - 1;
494
495 // Return the list of input arguments passed to the VM
496 // and preserve the order that the VM processes.
497 char* args = NEW_RESOURCE_ARRAY(char, length);
498 args[0] = '\0';
499 // concatenate all jvm_flags
500 if (num_flags > 0) {
501 strcat(args, vm_flags[0]);
502 for (i = 1; i < num_flags; i++) {
503 strcat(args, " ");
504 strcat(args, vm_flags[i]);
505 }
506 }
507
508 if (num_args > 0 && num_flags > 0) {
509 // append a space if args already contains one or more jvm_flags
510 strcat(args, " ");
511 }
512
513 // concatenate all jvm_args
514 if (num_args > 0) {
515 strcat(args, vm_args[0]);
516 for (i = 1; i < num_args; i++) {
517 strcat(args, " ");
518 strcat(args, vm_args[i]);
519 }
520 }
521
522 Handle hargs = java_lang_String::create_from_platform_dependent_str(args, CHECK_NULL);
523 return JNIHandles::make_local(env, hargs());
524 JVM_END
525
526 // Returns an array of java.lang.String object containing the input arguments to the VM.
527 JVM_ENTRY(jobjectArray, jmm_GetInputArgumentArray(JNIEnv *env))
528 ResourceMark rm(THREAD);
529
530 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
531 return NULL;
532 }
533
534 char** vm_flags = Arguments::jvm_flags_array();
535 char** vm_args = Arguments::jvm_args_array();
536 int num_flags = Arguments::num_jvm_flags();
537 int num_args = Arguments::num_jvm_args();
538
539 instanceKlassHandle ik (THREAD, SystemDictionary::String_klass());
540 objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL);
541 objArrayHandle result_h(THREAD, r);
542
543 int index = 0;
544 for (int j = 0; j < num_flags; j++, index++) {
545 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
546 result_h->obj_at_put(index, h());
547 }
548 for (int i = 0; i < num_args; i++, index++) {
549 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
550 result_h->obj_at_put(index, h());
551 }
552 return (jobjectArray) JNIHandles::make_local(env, result_h());
553 JVM_END
554
555 // Returns an array of java/lang/management/MemoryPoolMXBean object
556 // one for each memory pool if obj == null; otherwise returns
557 // an array of memory pools for a given memory manager if
558 // it is a valid memory manager.
559 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
560 ResourceMark rm(THREAD);
561
562 int num_memory_pools;
563 MemoryManager* mgr = NULL;
564 if (obj == NULL) {
565 num_memory_pools = MemoryService::num_memory_pools();
566 } else {
567 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
568 if (mgr == NULL) {
569 return NULL;
570 }
571 num_memory_pools = mgr->num_memory_pools();
572 }
573
574 // Allocate the resulting MemoryPoolMXBean[] object
575 klassOop k = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
576 instanceKlassHandle ik (THREAD, k);
577 objArrayOop r = oopFactory::new_objArray(ik(), num_memory_pools, CHECK_NULL);
578 objArrayHandle poolArray(THREAD, r);
579
580 if (mgr == NULL) {
581 // Get all memory pools
582 for (int i = 0; i < num_memory_pools; i++) {
583 MemoryPool* pool = MemoryService::get_memory_pool(i);
584 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
585 instanceHandle ph(THREAD, p);
586 poolArray->obj_at_put(i, ph());
587 }
588 } else {
589 // Get memory pools managed by a given memory manager
590 for (int i = 0; i < num_memory_pools; i++) {
591 MemoryPool* pool = mgr->get_memory_pool(i);
592 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
593 instanceHandle ph(THREAD, p);
594 poolArray->obj_at_put(i, ph());
595 }
596 }
597 return (jobjectArray) JNIHandles::make_local(env, poolArray());
598 JVM_END
599
600 // Returns an array of java/lang/management/MemoryManagerMXBean object
601 // one for each memory manager if obj == null; otherwise returns
602 // an array of memory managers for a given memory pool if
603 // it is a valid memory pool.
604 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
605 ResourceMark rm(THREAD);
606
607 int num_mgrs;
608 MemoryPool* pool = NULL;
609 if (obj == NULL) {
610 num_mgrs = MemoryService::num_memory_managers();
611 } else {
612 pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
613 if (pool == NULL) {
614 return NULL;
615 }
616 num_mgrs = pool->num_memory_managers();
617 }
618
619 // Allocate the resulting MemoryManagerMXBean[] object
620 klassOop k = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
621 instanceKlassHandle ik (THREAD, k);
622 objArrayOop r = oopFactory::new_objArray(ik(), num_mgrs, CHECK_NULL);
623 objArrayHandle mgrArray(THREAD, r);
624
625 if (pool == NULL) {
626 // Get all memory managers
627 for (int i = 0; i < num_mgrs; i++) {
628 MemoryManager* mgr = MemoryService::get_memory_manager(i);
629 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
630 instanceHandle ph(THREAD, p);
631 mgrArray->obj_at_put(i, ph());
632 }
633 } else {
634 // Get memory managers for a given memory pool
635 for (int i = 0; i < num_mgrs; i++) {
636 MemoryManager* mgr = pool->get_memory_manager(i);
637 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
638 instanceHandle ph(THREAD, p);
639 mgrArray->obj_at_put(i, ph());
640 }
641 }
642 return (jobjectArray) JNIHandles::make_local(env, mgrArray());
643 JVM_END
644
645
646 // Returns a java/lang/management/MemoryUsage object containing the memory usage
647 // of a given memory pool.
648 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
649 ResourceMark rm(THREAD);
650
651 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
652 if (pool != NULL) {
653 MemoryUsage usage = pool->get_memory_usage();
654 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
655 return JNIHandles::make_local(env, h());
656 } else {
657 return NULL;
658 }
659 JVM_END
660
661 // Returns a java/lang/management/MemoryUsage object containing the memory usage
662 // of a given memory pool.
663 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
664 ResourceMark rm(THREAD);
665
666 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
667 if (pool != NULL) {
668 MemoryUsage usage = pool->get_peak_memory_usage();
669 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
670 return JNIHandles::make_local(env, h());
671 } else {
672 return NULL;
673 }
674 JVM_END
675
676 // Returns a java/lang/management/MemoryUsage object containing the memory usage
677 // of a given memory pool after most recent GC.
678 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
679 ResourceMark rm(THREAD);
680
681 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
682 if (pool != NULL && pool->is_collected_pool()) {
683 MemoryUsage usage = pool->get_last_collection_usage();
684 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
685 return JNIHandles::make_local(env, h());
686 } else {
687 return NULL;
688 }
689 JVM_END
690
691 // Sets the memory pool sensor for a threshold type
692 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
693 if (obj == NULL || sensorObj == NULL) {
694 THROW(vmSymbols::java_lang_NullPointerException());
695 }
696
697 klassOop sensor_klass = Management::sun_management_Sensor_klass(CHECK);
698 oop s = JNIHandles::resolve(sensorObj);
699 assert(s->is_instance(), "Sensor should be an instanceOop");
700 instanceHandle sensor_h(THREAD, (instanceOop) s);
701 if (!sensor_h->is_a(sensor_klass)) {
702 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
703 "Sensor is not an instance of sun.management.Sensor class");
704 }
705
706 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
707 assert(mpool != NULL, "MemoryPool should exist");
708
709 switch (type) {
710 case JMM_USAGE_THRESHOLD_HIGH:
711 case JMM_USAGE_THRESHOLD_LOW:
712 // have only one sensor for threshold high and low
713 mpool->set_usage_sensor_obj(sensor_h);
714 break;
715 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
716 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
717 // have only one sensor for threshold high and low
718 mpool->set_gc_usage_sensor_obj(sensor_h);
719 break;
720 default:
721 assert(false, "Unrecognized type");
722 }
723
724 JVM_END
725
726
727 // Sets the threshold of a given memory pool.
728 // Returns the previous threshold.
729 //
730 // Input parameters:
731 // pool - the MemoryPoolMXBean object
732 // type - threshold type
733 // threshold - the new threshold (must not be negative)
734 //
735 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
736 if (threshold < 0) {
737 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
738 "Invalid threshold value",
739 -1);
740 }
741
742 if ((size_t)threshold > max_uintx) {
743 stringStream st;
744 st.print("Invalid valid threshold value. Threshold value (" UINT64_FORMAT ") > max value of size_t (" SIZE_FORMAT ")", (size_t)threshold, max_uintx);
745 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
746 }
747
748 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
749 assert(pool != NULL, "MemoryPool should exist");
750
751 jlong prev = 0;
752 switch (type) {
753 case JMM_USAGE_THRESHOLD_HIGH:
754 if (!pool->usage_threshold()->is_high_threshold_supported()) {
755 return -1;
756 }
757 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
758 break;
759
760 case JMM_USAGE_THRESHOLD_LOW:
761 if (!pool->usage_threshold()->is_low_threshold_supported()) {
762 return -1;
763 }
764 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
765 break;
766
767 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
768 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
769 return -1;
770 }
771 // return and the new threshold is effective for the next GC
772 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
773
774 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
775 if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
776 return -1;
777 }
778 // return and the new threshold is effective for the next GC
779 return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
780
781 default:
782 assert(false, "Unrecognized type");
783 return -1;
784 }
785
786 // When the threshold is changed, reevaluate if the low memory
787 // detection is enabled.
788 if (prev != threshold) {
789 LowMemoryDetector::recompute_enabled_for_collected_pools();
790 LowMemoryDetector::detect_low_memory(pool);
791 }
792 return prev;
793 JVM_END
794
795 // Gets an array containing the amount of memory allocated on the Java
796 // heap for a set of threads (in bytes). Each element of the array is
797 // the amount of memory allocated for the thread ID specified in the
798 // corresponding entry in the given array of thread IDs; or -1 if the
799 // thread does not exist or has terminated.
800 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
801 jlongArray sizeArray))
802 // Check if threads is null
803 if (ids == NULL || sizeArray == NULL) {
804 THROW(vmSymbols::java_lang_NullPointerException());
805 }
806
807 ResourceMark rm(THREAD);
808 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
809 typeArrayHandle ids_ah(THREAD, ta);
810
811 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
812 typeArrayHandle sizeArray_h(THREAD, sa);
813
814 // validate the thread id array
815 validate_thread_id_array(ids_ah, CHECK);
816
817 // sizeArray must be of the same length as the given array of thread IDs
818 int num_threads = ids_ah->length();
819 if (num_threads != sizeArray_h->length()) {
820 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
821 "The length of the given long array does not match the length of "
822 "the given array of thread IDs");
823 }
824
825 MutexLockerEx ml(Threads_lock);
826 for (int i = 0; i < num_threads; i++) {
827 JavaThread* java_thread = find_java_thread_from_id(ids_ah->long_at(i));
828 if (java_thread != NULL) {
829 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
830 }
831 }
832 JVM_END
833
834 // Returns a java/lang/management/MemoryUsage object representing
835 // the memory usage for the heap or non-heap memory.
836 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
837 ResourceMark rm(THREAD);
838
839 // Calculate the memory usage
840 size_t total_init = 0;
841 size_t total_used = 0;
842 size_t total_committed = 0;
843 size_t total_max = 0;
844 bool has_undefined_init_size = false;
845 bool has_undefined_max_size = false;
846
847 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
848 MemoryPool* pool = MemoryService::get_memory_pool(i);
849 if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
850 MemoryUsage u = pool->get_memory_usage();
851 total_used += u.used();
852 total_committed += u.committed();
853
854 if (u.init_size() == (size_t)-1) {
855 has_undefined_init_size = true;
856 }
857 if (!has_undefined_init_size) {
858 total_init += u.init_size();
859 }
860
861 if (u.max_size() == (size_t)-1) {
862 has_undefined_max_size = true;
863 }
864 if (!has_undefined_max_size) {
865 total_max += u.max_size();
866 }
867 }
868 }
869
870 // if any one of the memory pool has undefined init_size or max_size,
871 // set it to -1
872 if (has_undefined_init_size) {
873 total_init = (size_t)-1;
874 }
875 if (has_undefined_max_size) {
876 total_max = (size_t)-1;
877 }
878
879 // In our current implementation, we make sure that all non-heap
880 // pools have defined init and max sizes. Heap pools do not matter,
881 // as we never use total_init and total_max for them.
882 assert(heap || !has_undefined_init_size, "Undefined init size");
883 assert(heap || !has_undefined_max_size, "Undefined max size");
884
885 MemoryUsage usage((heap ? InitialHeapSize : total_init),
886 total_used,
887 total_committed,
888 (heap ? Universe::heap()->max_capacity() : total_max));
889
890 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
891 return JNIHandles::make_local(env, obj());
892 JVM_END
893
894 // Returns the boolean value of a given attribute.
895 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
896 switch (att) {
897 case JMM_VERBOSE_GC:
898 return MemoryService::get_verbose();
899 case JMM_VERBOSE_CLASS:
900 return ClassLoadingService::get_verbose();
901 case JMM_THREAD_CONTENTION_MONITORING:
902 return ThreadService::is_thread_monitoring_contention();
903 case JMM_THREAD_CPU_TIME:
904 return ThreadService::is_thread_cpu_time_enabled();
905 case JMM_THREAD_ALLOCATED_MEMORY:
906 return ThreadService::is_thread_allocated_memory_enabled();
907 default:
908 assert(0, "Unrecognized attribute");
909 return false;
910 }
911 JVM_END
912
913 // Sets the given boolean attribute and returns the previous value.
914 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
915 switch (att) {
916 case JMM_VERBOSE_GC:
917 return MemoryService::set_verbose(flag != 0);
918 case JMM_VERBOSE_CLASS:
919 return ClassLoadingService::set_verbose(flag != 0);
920 case JMM_THREAD_CONTENTION_MONITORING:
921 return ThreadService::set_thread_monitoring_contention(flag != 0);
922 case JMM_THREAD_CPU_TIME:
923 return ThreadService::set_thread_cpu_time_enabled(flag != 0);
924 case JMM_THREAD_ALLOCATED_MEMORY:
925 return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
926 default:
927 assert(0, "Unrecognized attribute");
928 return false;
929 }
930 JVM_END
931
932
933 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
934 switch (att) {
935 case JMM_GC_TIME_MS:
936 return mgr->gc_time_ms();
937
938 case JMM_GC_COUNT:
939 return mgr->gc_count();
940
941 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
942 // current implementation only has 1 ext attribute
943 return 1;
944
945 default:
946 assert(0, "Unrecognized GC attribute");
947 return -1;
948 }
949 }
950
951 class VmThreadCountClosure: public ThreadClosure {
952 private:
953 int _count;
954 public:
955 VmThreadCountClosure() : _count(0) {};
956 void do_thread(Thread* thread);
957 int count() { return _count; }
958 };
959
960 void VmThreadCountClosure::do_thread(Thread* thread) {
961 // exclude externally visible JavaThreads
962 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
963 return;
964 }
965
966 _count++;
967 }
968
969 static jint get_vm_thread_count() {
970 VmThreadCountClosure vmtcc;
971 {
972 MutexLockerEx ml(Threads_lock);
973 Threads::threads_do(&vmtcc);
974 }
975
976 return vmtcc.count();
977 }
978
979 static jint get_num_flags() {
980 // last flag entry is always NULL, so subtract 1
981 int nFlags = (int) Flag::numFlags - 1;
982 int count = 0;
983 for (int i = 0; i < nFlags; i++) {
984 Flag* flag = &Flag::flags[i];
985 // Exclude the locked (diagnostic, experimental) flags
986 if (flag->is_unlocked() || flag->is_unlocker()) {
987 count++;
988 }
989 }
990 return count;
991 }
992
993 static jlong get_long_attribute(jmmLongAttribute att) {
994 switch (att) {
995 case JMM_CLASS_LOADED_COUNT:
996 return ClassLoadingService::loaded_class_count();
997
998 case JMM_CLASS_UNLOADED_COUNT:
999 return ClassLoadingService::unloaded_class_count();
1000
1001 case JMM_THREAD_TOTAL_COUNT:
1002 return ThreadService::get_total_thread_count();
1003
1004 case JMM_THREAD_LIVE_COUNT:
1005 return ThreadService::get_live_thread_count();
1006
1007 case JMM_THREAD_PEAK_COUNT:
1008 return ThreadService::get_peak_thread_count();
1009
1010 case JMM_THREAD_DAEMON_COUNT:
1011 return ThreadService::get_daemon_thread_count();
1012
1013 case JMM_JVM_INIT_DONE_TIME_MS:
1014 return Management::vm_init_done_time();
1015
1016 case JMM_COMPILE_TOTAL_TIME_MS:
1017 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
1018
1019 case JMM_OS_PROCESS_ID:
1020 return os::current_process_id();
1021
1022 // Hotspot-specific counters
1023 case JMM_CLASS_LOADED_BYTES:
1024 return ClassLoadingService::loaded_class_bytes();
1025
1026 case JMM_CLASS_UNLOADED_BYTES:
1027 return ClassLoadingService::unloaded_class_bytes();
1028
1029 case JMM_SHARED_CLASS_LOADED_COUNT:
1030 return ClassLoadingService::loaded_shared_class_count();
1031
1032 case JMM_SHARED_CLASS_UNLOADED_COUNT:
1033 return ClassLoadingService::unloaded_shared_class_count();
1034
1035
1036 case JMM_SHARED_CLASS_LOADED_BYTES:
1037 return ClassLoadingService::loaded_shared_class_bytes();
1038
1039 case JMM_SHARED_CLASS_UNLOADED_BYTES:
1040 return ClassLoadingService::unloaded_shared_class_bytes();
1041
1042 case JMM_TOTAL_CLASSLOAD_TIME_MS:
1043 return ClassLoader::classloader_time_ms();
1044
1045 case JMM_VM_GLOBAL_COUNT:
1046 return get_num_flags();
1047
1048 case JMM_SAFEPOINT_COUNT:
1049 return RuntimeService::safepoint_count();
1050
1051 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
1052 return RuntimeService::safepoint_sync_time_ms();
1053
1054 case JMM_TOTAL_STOPPED_TIME_MS:
1055 return RuntimeService::safepoint_time_ms();
1056
1057 case JMM_TOTAL_APP_TIME_MS:
1058 return RuntimeService::application_time_ms();
1059
1060 case JMM_VM_THREAD_COUNT:
1061 return get_vm_thread_count();
1062
1063 case JMM_CLASS_INIT_TOTAL_COUNT:
1064 return ClassLoader::class_init_count();
1065
1066 case JMM_CLASS_INIT_TOTAL_TIME_MS:
1067 return ClassLoader::class_init_time_ms();
1068
1069 case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
1070 return ClassLoader::class_verify_time_ms();
1071
1072 case JMM_METHOD_DATA_SIZE_BYTES:
1073 return ClassLoadingService::class_method_data_size();
1074
1075 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
1076 return os::physical_memory();
1077
1078 default:
1079 return -1;
1080 }
1081 }
1082
1083
1084 // Returns the long value of a given attribute.
1085 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
1086 if (obj == NULL) {
1087 return get_long_attribute(att);
1088 } else {
1089 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
1090 if (mgr != NULL) {
1091 return get_gc_attribute(mgr, att);
1092 }
1093 }
1094 return -1;
1095 JVM_END
1096
1097 // Gets the value of all attributes specified in the given array
1098 // and sets the value in the result array.
1099 // Returns the number of attributes found.
1100 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
1101 jobject obj,
1102 jmmLongAttribute* atts,
1103 jint count,
1104 jlong* result))
1105
1106 int num_atts = 0;
1107 if (obj == NULL) {
1108 for (int i = 0; i < count; i++) {
1109 result[i] = get_long_attribute(atts[i]);
1110 if (result[i] != -1) {
1111 num_atts++;
1112 }
1113 }
1114 } else {
1115 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
1116 for (int i = 0; i < count; i++) {
1117 result[i] = get_gc_attribute(mgr, atts[i]);
1118 if (result[i] != -1) {
1119 num_atts++;
1120 }
1121 }
1122 }
1123 return num_atts;
1124 JVM_END
1125
1126 // Helper function to do thread dump for a specific list of threads
1127 static void do_thread_dump(ThreadDumpResult* dump_result,
1128 typeArrayHandle ids_ah, // array of thread ID (long[])
1129 int num_threads,
1130 int max_depth,
1131 bool with_locked_monitors,
1132 bool with_locked_synchronizers,
1133 TRAPS) {
1134
1135 // First get an array of threadObj handles.
1136 // A JavaThread may terminate before we get the stack trace.
1137 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1138 {
1139 MutexLockerEx ml(Threads_lock);
1140 for (int i = 0; i < num_threads; i++) {
1141 jlong tid = ids_ah->long_at(i);
1142 JavaThread* jt = find_java_thread_from_id(tid);
1143 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1144 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1145 thread_handle_array->append(threadObj_h);
1146 }
1147 }
1148
1149 // Obtain thread dumps and thread snapshot information
1150 VM_ThreadDump op(dump_result,
1151 thread_handle_array,
1152 num_threads,
1153 max_depth, /* stack depth */
1154 with_locked_monitors,
1155 with_locked_synchronizers);
1156 VMThread::execute(&op);
1157 }
1158
1159 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1160 // for the thread ID specified in the corresponding entry in
1161 // the given array of thread IDs; or NULL if the thread does not exist
1162 // or has terminated.
1163 //
1164 // Input parameters:
1165 // ids - array of thread IDs
1166 // maxDepth - the maximum depth of stack traces to be dumped:
1167 // maxDepth == -1 requests to dump entire stack trace.
1168 // maxDepth == 0 requests no stack trace.
1169 // infoArray - array of ThreadInfo objects
1170 //
1171 // QQQ - Why does this method return a value instead of void?
1172 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1173 // Check if threads is null
1174 if (ids == NULL || infoArray == NULL) {
1175 THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1176 }
1177
1178 if (maxDepth < -1) {
1179 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1180 "Invalid maxDepth", -1);
1181 }
1182
1183 ResourceMark rm(THREAD);
1184 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1185 typeArrayHandle ids_ah(THREAD, ta);
1186
1187 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1188 objArrayOop oa = objArrayOop(infoArray_obj);
1189 objArrayHandle infoArray_h(THREAD, oa);
1190
1191 // validate the thread id array
1192 validate_thread_id_array(ids_ah, CHECK_0);
1193
1194 // validate the ThreadInfo[] parameters
1195 validate_thread_info_array(infoArray_h, CHECK_0);
1196
1197 // infoArray must be of the same length as the given array of thread IDs
1198 int num_threads = ids_ah->length();
1199 if (num_threads != infoArray_h->length()) {
1200 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1201 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1202 }
1203
1204 if (JDK_Version::is_gte_jdk16x_version()) {
1205 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1206 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1207 }
1208
1209 // Must use ThreadDumpResult to store the ThreadSnapshot.
1210 // GC may occur after the thread snapshots are taken but before
1211 // this function returns. The threadObj and other oops kept
1212 // in the ThreadSnapshot are marked and adjusted during GC.
1213 ThreadDumpResult dump_result(num_threads);
1214
1215 if (maxDepth == 0) {
1216 // no stack trace dumped - do not need to stop the world
1217 {
1218 MutexLockerEx ml(Threads_lock);
1219 for (int i = 0; i < num_threads; i++) {
1220 jlong tid = ids_ah->long_at(i);
1221 JavaThread* jt = find_java_thread_from_id(tid);
1222 ThreadSnapshot* ts;
1223 if (jt == NULL) {
1224 // if the thread does not exist or now it is terminated,
1225 // create dummy snapshot
1226 ts = new ThreadSnapshot();
1227 } else {
1228 ts = new ThreadSnapshot(jt);
1229 }
1230 dump_result.add_thread_snapshot(ts);
1231 }
1232 }
1233 } else {
1234 // obtain thread dump with the specific list of threads with stack trace
1235 do_thread_dump(&dump_result,
1236 ids_ah,
1237 num_threads,
1238 maxDepth,
1239 false, /* no locked monitor */
1240 false, /* no locked synchronizers */
1241 CHECK_0);
1242 }
1243
1244 int num_snapshots = dump_result.num_snapshots();
1245 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1246 int index = 0;
1247 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1248 // For each thread, create an java/lang/management/ThreadInfo object
1249 // and fill with the thread information
1250
1251 if (ts->threadObj() == NULL) {
1252 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1253 infoArray_h->obj_at_put(index, NULL);
1254 continue;
1255 }
1256
1257 // Create java.lang.management.ThreadInfo object
1258 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1259 infoArray_h->obj_at_put(index, info_obj);
1260 }
1261 return 0;
1262 JVM_END
1263
1264 // Dump thread info for the specified threads.
1265 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1266 // for the thread ID specified in the corresponding entry in
1267 // the given array of thread IDs; or NULL if the thread does not exist
1268 // or has terminated.
1269 //
1270 // Input parameter:
1271 // ids - array of thread IDs; NULL indicates all live threads
1272 // locked_monitors - if true, dump locked object monitors
1273 // locked_synchronizers - if true, dump locked JSR-166 synchronizers
1274 //
1275 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers))
1276 ResourceMark rm(THREAD);
1277
1278 if (JDK_Version::is_gte_jdk16x_version()) {
1279 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1280 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1281 }
1282
1283 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1284 int num_threads = (ta != NULL ? ta->length() : 0);
1285 typeArrayHandle ids_ah(THREAD, ta);
1286
1287 ThreadDumpResult dump_result(num_threads); // can safepoint
1288
1289 if (ids_ah() != NULL) {
1290
1291 // validate the thread id array
1292 validate_thread_id_array(ids_ah, CHECK_NULL);
1293
1294 // obtain thread dump of a specific list of threads
1295 do_thread_dump(&dump_result,
1296 ids_ah,
1297 num_threads,
1298 -1, /* entire stack */
1299 (locked_monitors ? true : false), /* with locked monitors */
1300 (locked_synchronizers ? true : false), /* with locked synchronizers */
1301 CHECK_NULL);
1302 } else {
1303 // obtain thread dump of all threads
1304 VM_ThreadDump op(&dump_result,
1305 -1, /* entire stack */
1306 (locked_monitors ? true : false), /* with locked monitors */
1307 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1308 VMThread::execute(&op);
1309 }
1310
1311 int num_snapshots = dump_result.num_snapshots();
1312
1313 // create the result ThreadInfo[] object
1314 klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1315 instanceKlassHandle ik (THREAD, k);
1316 objArrayOop r = oopFactory::new_objArray(ik(), num_snapshots, CHECK_NULL);
1317 objArrayHandle result_h(THREAD, r);
1318
1319 int index = 0;
1320 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1321 if (ts->threadObj() == NULL) {
1322 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1323 result_h->obj_at_put(index, NULL);
1324 continue;
1325 }
1326
1327 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1328 assert(stacktrace != NULL, "Must have a stack trace dumped");
1329
1330 // Create Object[] filled with locked monitors
1331 // Create int[] filled with the stack depth where a monitor was locked
1332 int num_frames = stacktrace->get_stack_depth();
1333 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1334
1335 // Count the total number of locked monitors
1336 for (int i = 0; i < num_frames; i++) {
1337 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1338 num_locked_monitors += frame->num_locked_monitors();
1339 }
1340
1341 objArrayHandle monitors_array;
1342 typeArrayHandle depths_array;
1343 objArrayHandle synchronizers_array;
1344
1345 if (locked_monitors) {
1346 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1347 // where the thread locked it
1348 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1349 objArrayHandle mh(THREAD, array);
1350 monitors_array = mh;
1351
1352 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1353 typeArrayHandle dh(THREAD, tarray);
1354 depths_array = dh;
1355
1356 int count = 0;
1357 int j = 0;
1358 for (int depth = 0; depth < num_frames; depth++) {
1359 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1360 int len = frame->num_locked_monitors();
1361 GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1362 for (j = 0; j < len; j++) {
1363 oop monitor = locked_monitors->at(j);
1364 assert(monitor != NULL && monitor->is_instance(), "must be a Java object");
1365 monitors_array->obj_at_put(count, monitor);
1366 depths_array->int_at_put(count, depth);
1367 count++;
1368 }
1369 }
1370
1371 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1372 for (j = 0; j < jni_locked_monitors->length(); j++) {
1373 oop object = jni_locked_monitors->at(j);
1374 assert(object != NULL && object->is_instance(), "must be a Java object");
1375 monitors_array->obj_at_put(count, object);
1376 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1377 depths_array->int_at_put(count, -1);
1378 count++;
1379 }
1380 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1381 }
1382
1383 if (locked_synchronizers) {
1384 // Create Object[] filled with locked JSR-166 synchronizers
1385 assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1386 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1387 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1388 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1389
1390 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1391 objArrayHandle sh(THREAD, array);
1392 synchronizers_array = sh;
1393
1394 for (int k = 0; k < num_locked_synchronizers; k++) {
1395 synchronizers_array->obj_at_put(k, locks->at(k));
1396 }
1397 }
1398
1399 // Create java.lang.management.ThreadInfo object
1400 instanceOop info_obj = Management::create_thread_info_instance(ts,
1401 monitors_array,
1402 depths_array,
1403 synchronizers_array,
1404 CHECK_NULL);
1405 result_h->obj_at_put(index, info_obj);
1406 }
1407
1408 return (jobjectArray) JNIHandles::make_local(env, result_h());
1409 JVM_END
1410
1411 // Returns an array of Class objects.
1412 JVM_ENTRY(jobjectArray, jmm_GetLoadedClasses(JNIEnv *env))
1413 ResourceMark rm(THREAD);
1414
1415 LoadedClassesEnumerator lce(THREAD); // Pass current Thread as parameter
1416
1417 int num_classes = lce.num_loaded_classes();
1418 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), num_classes, CHECK_0);
1419 objArrayHandle classes_ah(THREAD, r);
1420
1421 for (int i = 0; i < num_classes; i++) {
1422 KlassHandle kh = lce.get_klass(i);
1423 oop mirror = Klass::cast(kh())->java_mirror();
1424 classes_ah->obj_at_put(i, mirror);
1425 }
1426
1427 return (jobjectArray) JNIHandles::make_local(env, classes_ah());
1428 JVM_END
1429
1430 // Reset statistic. Return true if the requested statistic is reset.
1431 // Otherwise, return false.
1432 //
1433 // Input parameters:
1434 // obj - specify which instance the statistic associated with to be reset
1435 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1436 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1437 // type - the type of statistic to be reset
1438 //
1439 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1440 ResourceMark rm(THREAD);
1441
1442 switch (type) {
1443 case JMM_STAT_PEAK_THREAD_COUNT:
1444 ThreadService::reset_peak_thread_count();
1445 return true;
1446
1447 case JMM_STAT_THREAD_CONTENTION_COUNT:
1448 case JMM_STAT_THREAD_CONTENTION_TIME: {
1449 jlong tid = obj.j;
1450 if (tid < 0) {
1451 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1452 }
1453
1454 // Look for the JavaThread of this given tid
1455 MutexLockerEx ml(Threads_lock);
1456 if (tid == 0) {
1457 // reset contention statistics for all threads if tid == 0
1458 for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) {
1459 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1460 ThreadService::reset_contention_count_stat(java_thread);
1461 } else {
1462 ThreadService::reset_contention_time_stat(java_thread);
1463 }
1464 }
1465 } else {
1466 // reset contention statistics for a given thread
1467 JavaThread* java_thread = find_java_thread_from_id(tid);
1468 if (java_thread == NULL) {
1469 return false;
1470 }
1471
1472 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1473 ThreadService::reset_contention_count_stat(java_thread);
1474 } else {
1475 ThreadService::reset_contention_time_stat(java_thread);
1476 }
1477 }
1478 return true;
1479 break;
1480 }
1481 case JMM_STAT_PEAK_POOL_USAGE: {
1482 jobject o = obj.l;
1483 if (o == NULL) {
1484 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1485 }
1486
1487 oop pool_obj = JNIHandles::resolve(o);
1488 assert(pool_obj->is_instance(), "Should be an instanceOop");
1489 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1490
1491 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1492 if (pool != NULL) {
1493 pool->reset_peak_memory_usage();
1494 return true;
1495 }
1496 break;
1497 }
1498 case JMM_STAT_GC_STAT: {
1499 jobject o = obj.l;
1500 if (o == NULL) {
1501 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1502 }
1503
1504 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1505 if (mgr != NULL) {
1506 mgr->reset_gc_stat();
1507 return true;
1508 }
1509 break;
1510 }
1511 default:
1512 assert(0, "Unknown Statistic Type");
1513 }
1514 return false;
1515 JVM_END
1516
1517 // Returns the fast estimate of CPU time consumed by
1518 // a given thread (in nanoseconds).
1519 // If thread_id == 0, return CPU time for the current thread.
1520 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1521 if (!os::is_thread_cpu_time_supported()) {
1522 return -1;
1523 }
1524
1525 if (thread_id < 0) {
1526 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1527 "Invalid thread ID", -1);
1528 }
1529
1530 JavaThread* java_thread = NULL;
1531 if (thread_id == 0) {
1532 // current thread
1533 return os::current_thread_cpu_time();
1534 } else {
1535 MutexLockerEx ml(Threads_lock);
1536 java_thread = find_java_thread_from_id(thread_id);
1537 if (java_thread != NULL) {
1538 return os::thread_cpu_time((Thread*) java_thread);
1539 }
1540 }
1541 return -1;
1542 JVM_END
1543
1544 // Returns the CPU time consumed by a given thread (in nanoseconds).
1545 // If thread_id == 0, CPU time for the current thread is returned.
1546 // If user_sys_cpu_time = true, user level and system CPU time of
1547 // a given thread is returned; otherwise, only user level CPU time
1548 // is returned.
1549 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
1550 if (!os::is_thread_cpu_time_supported()) {
1551 return -1;
1552 }
1553
1554 if (thread_id < 0) {
1555 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1556 "Invalid thread ID", -1);
1557 }
1558
1559 JavaThread* java_thread = NULL;
1560 if (thread_id == 0) {
1561 // current thread
1562 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
1563 } else {
1564 MutexLockerEx ml(Threads_lock);
1565 java_thread = find_java_thread_from_id(thread_id);
1566 if (java_thread != NULL) {
1567 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
1568 }
1569 }
1570 return -1;
1571 JVM_END
1572
1573 // Gets an array containing the CPU times consumed by a set of threads
1574 // (in nanoseconds). Each element of the array is the CPU time for the
1575 // thread ID specified in the corresponding entry in the given array
1576 // of thread IDs; or -1 if the thread does not exist or has terminated.
1577 // If user_sys_cpu_time = true, the sum of user level and system CPU time
1578 // for the given thread is returned; otherwise, only user level CPU time
1579 // is returned.
1580 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
1581 jlongArray timeArray,
1582 jboolean user_sys_cpu_time))
1583 // Check if threads is null
1584 if (ids == NULL || timeArray == NULL) {
1585 THROW(vmSymbols::java_lang_NullPointerException());
1586 }
1587
1588 ResourceMark rm(THREAD);
1589 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1590 typeArrayHandle ids_ah(THREAD, ta);
1591
1592 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
1593 typeArrayHandle timeArray_h(THREAD, tia);
1594
1595 // validate the thread id array
1596 validate_thread_id_array(ids_ah, CHECK);
1597
1598 // timeArray must be of the same length as the given array of thread IDs
1599 int num_threads = ids_ah->length();
1600 if (num_threads != timeArray_h->length()) {
1601 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1602 "The length of the given long array does not match the length of "
1603 "the given array of thread IDs");
1604 }
1605
1606 MutexLockerEx ml(Threads_lock);
1607 for (int i = 0; i < num_threads; i++) {
1608 JavaThread* java_thread = find_java_thread_from_id(ids_ah->long_at(i));
1609 if (java_thread != NULL) {
1610 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
1611 user_sys_cpu_time != 0));
1612 }
1613 }
1614 JVM_END
1615
1616 // Returns a String array of all VM global flag names
1617 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1618 // last flag entry is always NULL, so subtract 1
1619 int nFlags = (int) Flag::numFlags - 1;
1620 // allocate a temp array
1621 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1622 nFlags, CHECK_0);
1623 objArrayHandle flags_ah(THREAD, r);
1624 int num_entries = 0;
1625 for (int i = 0; i < nFlags; i++) {
1626 Flag* flag = &Flag::flags[i];
1627 // Exclude the locked (experimental, diagnostic) flags
1628 if (flag->is_unlocked() || flag->is_unlocker()) {
1629 Handle s = java_lang_String::create_from_str(flag->name, CHECK_0);
1630 flags_ah->obj_at_put(num_entries, s());
1631 num_entries++;
1632 }
1633 }
1634
1635 if (num_entries < nFlags) {
1636 // Return array of right length
1637 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1638 for(int i = 0; i < num_entries; i++) {
1639 res->obj_at_put(i, flags_ah->obj_at(i));
1640 }
1641 return (jobjectArray)JNIHandles::make_local(env, res);
1642 }
1643
1644 return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1645 JVM_END
1646
1647 // Utility function used by jmm_GetVMGlobals. Returns false if flag type
1648 // can't be determined, true otherwise. If false is returned, then *global
1649 // will be incomplete and invalid.
1650 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
1651 Handle flag_name;
1652 if (name() == NULL) {
1653 flag_name = java_lang_String::create_from_str(flag->name, CHECK_false);
1654 } else {
1655 flag_name = name;
1656 }
1657 global->name = (jstring)JNIHandles::make_local(env, flag_name());
1658
1659 if (flag->is_bool()) {
1660 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1661 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1662 } else if (flag->is_intx()) {
1663 global->value.j = (jlong)flag->get_intx();
1664 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1665 } else if (flag->is_uintx()) {
1666 global->value.j = (jlong)flag->get_uintx();
1667 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1668 } else if (flag->is_uint64_t()) {
1669 global->value.j = (jlong)flag->get_uint64_t();
1670 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1671 } else if (flag->is_ccstr()) {
1672 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1673 global->value.l = (jobject)JNIHandles::make_local(env, str());
1674 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1675 } else {
1676 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1677 return false;
1678 }
1679
1680 global->writeable = flag->is_writeable();
1681 global->external = flag->is_external();
1682 switch (flag->origin) {
1683 case DEFAULT:
1684 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1685 break;
1686 case COMMAND_LINE:
1687 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1688 break;
1689 case ENVIRON_VAR:
1690 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1691 break;
1692 case CONFIG_FILE:
1693 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1694 break;
1695 case MANAGEMENT:
1696 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1697 break;
1698 case ERGONOMIC:
1699 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1700 break;
1701 default:
1702 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1703 }
1704
1705 return true;
1706 }
1707
1708 // Fill globals array of count length with jmmVMGlobal entries
1709 // specified by names. If names == NULL, fill globals array
1710 // with all Flags. Return value is number of entries
1711 // created in globals.
1712 // If a Flag with a given name in an array element does not
1713 // exist, globals[i].name will be set to NULL.
1714 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1715 jobjectArray names,
1716 jmmVMGlobal *globals,
1717 jint count))
1718
1719
1720 if (globals == NULL) {
1721 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1722 }
1723
1724 ResourceMark rm(THREAD);
1725
1726 if (names != NULL) {
1727 // return the requested globals
1728 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1729 objArrayHandle names_ah(THREAD, ta);
1730 // Make sure we have a String array
1731 klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass();
1732 if (element_klass != SystemDictionary::String_klass()) {
1733 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1734 "Array element type is not String class", 0);
1735 }
1736
1737 int names_length = names_ah->length();
1738 int num_entries = 0;
1739 for (int i = 0; i < names_length && i < count; i++) {
1740 oop s = names_ah->obj_at(i);
1741 if (s == NULL) {
1742 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1743 }
1744
1745 Handle sh(THREAD, s);
1746 char* str = java_lang_String::as_utf8_string(s);
1747 Flag* flag = Flag::find_flag(str, strlen(str));
1748 if (flag != NULL &&
1749 add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1750 num_entries++;
1751 } else {
1752 globals[i].name = NULL;
1753 }
1754 }
1755 return num_entries;
1756 } else {
1757 // return all globals if names == NULL
1758
1759 // last flag entry is always NULL, so subtract 1
1760 int nFlags = (int) Flag::numFlags - 1;
1761 Handle null_h;
1762 int num_entries = 0;
1763 for (int i = 0; i < nFlags && num_entries < count; i++) {
1764 Flag* flag = &Flag::flags[i];
1765 // Exclude the locked (diagnostic, experimental) flags
1766 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1767 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1768 num_entries++;
1769 }
1770 }
1771 return num_entries;
1772 }
1773 JVM_END
1774
1775 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1776 ResourceMark rm(THREAD);
1777
1778 oop fn = JNIHandles::resolve_external_guard(flag_name);
1779 if (fn == NULL) {
1780 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1781 "The flag name cannot be null.");
1782 }
1783 char* name = java_lang_String::as_utf8_string(fn);
1784 Flag* flag = Flag::find_flag(name, strlen(name));
1785 if (flag == NULL) {
1786 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1787 "Flag does not exist.");
1788 }
1789 if (!flag->is_writeable()) {
1790 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1791 "This flag is not writeable.");
1792 }
1793
1794 bool succeed;
1795 if (flag->is_bool()) {
1796 bool bvalue = (new_value.z == JNI_TRUE ? true : false);
1797 succeed = CommandLineFlags::boolAtPut(name, &bvalue, MANAGEMENT);
1798 } else if (flag->is_intx()) {
1799 intx ivalue = (intx)new_value.j;
1800 succeed = CommandLineFlags::intxAtPut(name, &ivalue, MANAGEMENT);
1801 } else if (flag->is_uintx()) {
1802 uintx uvalue = (uintx)new_value.j;
1803
1804 if (strncmp(name, "MaxHeapFreeRatio", 17) == 0) {
1805 FormatBuffer<80> err_msg("");
1806 if (!Arguments::verify_MaxHeapFreeRatio(err_msg, uvalue)) {
1807 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), err_msg.buffer());
1808 }
1809 } else if (strncmp(name, "MinHeapFreeRatio", 17) == 0) {
1810 FormatBuffer<80> err_msg("");
1811 if (!Arguments::verify_MinHeapFreeRatio(err_msg, uvalue)) {
1812 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), err_msg.buffer());
1813 }
1814 }
1815 succeed = CommandLineFlags::uintxAtPut(name, &uvalue, MANAGEMENT);
1816 } else if (flag->is_uint64_t()) {
1817 uint64_t uvalue = (uint64_t)new_value.j;
1818 succeed = CommandLineFlags::uint64_tAtPut(name, &uvalue, MANAGEMENT);
1819 } else if (flag->is_ccstr()) {
1820 oop str = JNIHandles::resolve_external_guard(new_value.l);
1821 if (str == NULL) {
1822 THROW(vmSymbols::java_lang_NullPointerException());
1823 }
1824 ccstr svalue = java_lang_String::as_utf8_string(str);
1825 succeed = CommandLineFlags::ccstrAtPut(name, &svalue, MANAGEMENT);
1826 }
1827 assert(succeed, "Setting flag should succeed");
1828 JVM_END
1829
1830 class ThreadTimesClosure: public ThreadClosure {
1831 private:
1832 objArrayHandle _names_strings;
1833 char **_names_chars;
1834 typeArrayOop _times;
1835 int _names_len;
1836 int _times_len;
1837 int _count;
1838
1839 public:
1840 ThreadTimesClosure(objArrayHandle names, typeArrayOop times);
1841 ~ThreadTimesClosure();
1842 virtual void do_thread(Thread* thread);
1843 void do_unlocked();
1844 int count() { return _count; }
1845 };
1846
1847 ThreadTimesClosure::ThreadTimesClosure(objArrayHandle names,
1848 typeArrayOop times) {
1849 assert(names() != NULL, "names was NULL");
1850 assert(times != NULL, "times was NULL");
1851 _names_strings = names;
1852 _names_len = names->length();
1853 _names_chars = NEW_C_HEAP_ARRAY(char*, _names_len, mtInternal);
1854 _times = times;
1855 _times_len = times->length();
1856 _count = 0;
1857 }
1858
1859 //
1860 // Called with Threads_lock held
1861 //
1862 void ThreadTimesClosure::do_thread(Thread* thread) {
1863 assert(thread != NULL, "thread was NULL");
1864
1865 // exclude externally visible JavaThreads
1866 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1867 return;
1868 }
1869
1870 if (_count >= _names_len || _count >= _times_len) {
1871 // skip if the result array is not big enough
1872 return;
1873 }
1874
1875 EXCEPTION_MARK;
1876 ResourceMark rm(THREAD); // thread->name() uses ResourceArea
1877
1878 assert(thread->name() != NULL, "All threads should have a name");
1879 _names_chars[_count] = strdup(thread->name());
1880 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1881 os::thread_cpu_time(thread) : -1);
1882 _count++;
1883 }
1884
1885 // Called without Threads_lock, we can allocate String objects.
1886 void ThreadTimesClosure::do_unlocked() {
1887
1888 EXCEPTION_MARK;
1889 for (int i = 0; i < _count; i++) {
1890 Handle s = java_lang_String::create_from_str(_names_chars[i], CHECK);
1891 _names_strings->obj_at_put(i, s());
1892 }
1893 }
1894
1895 ThreadTimesClosure::~ThreadTimesClosure() {
1896 for (int i = 0; i < _count; i++) {
1897 free(_names_chars[i]);
1898 }
1899 FREE_C_HEAP_ARRAY(char *, _names_chars, mtInternal);
1900 }
1901
1902 // Fills names with VM internal thread names and times with the corresponding
1903 // CPU times. If names or times is NULL, a NullPointerException is thrown.
1904 // If the element type of names is not String, an IllegalArgumentException is
1905 // thrown.
1906 // If an array is not large enough to hold all the entries, only the entries
1907 // that fit will be returned. Return value is the number of VM internal
1908 // threads entries.
1909 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1910 jobjectArray names,
1911 jlongArray times))
1912 if (names == NULL || times == NULL) {
1913 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1914 }
1915 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1916 objArrayHandle names_ah(THREAD, na);
1917
1918 // Make sure we have a String array
1919 klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass();
1920 if (element_klass != SystemDictionary::String_klass()) {
1921 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1922 "Array element type is not String class", 0);
1923 }
1924
1925 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1926 typeArrayHandle times_ah(THREAD, ta);
1927
1928 ThreadTimesClosure ttc(names_ah, times_ah());
1929 {
1930 MutexLockerEx ml(Threads_lock);
1931 Threads::threads_do(&ttc);
1932 }
1933 ttc.do_unlocked();
1934 return ttc.count();
1935 JVM_END
1936
1937 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1938 ResourceMark rm(THREAD);
1939
1940 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1941 VMThread::execute(&op);
1942
1943 DeadlockCycle* deadlocks = op.result();
1944 if (deadlocks == NULL) {
1945 // no deadlock found and return
1946 return Handle();
1947 }
1948
1949 int num_threads = 0;
1950 DeadlockCycle* cycle;
1951 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1952 num_threads += cycle->num_threads();
1953 }
1954
1955 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1956 objArrayHandle threads_ah(THREAD, r);
1957
1958 int index = 0;
1959 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1960 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1961 int len = deadlock_threads->length();
1962 for (int i = 0; i < len; i++) {
1963 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1964 index++;
1965 }
1966 }
1967 return threads_ah;
1968 }
1969
1970 // Finds cycles of threads that are deadlocked involved in object monitors
1971 // and JSR-166 synchronizers.
1972 // Returns an array of Thread objects which are in deadlock, if any.
1973 // Otherwise, returns NULL.
1974 //
1975 // Input parameter:
1976 // object_monitors_only - if true, only check object monitors
1977 //
1978 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1979 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1980 return (jobjectArray) JNIHandles::make_local(env, result());
1981 JVM_END
1982
1983 // Finds cycles of threads that are deadlocked on monitor locks
1984 // Returns an array of Thread objects which are in deadlock, if any.
1985 // Otherwise, returns NULL.
1986 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1987 Handle result = find_deadlocks(true, CHECK_0);
1988 return (jobjectArray) JNIHandles::make_local(env, result());
1989 JVM_END
1990
1991 // Gets the information about GC extension attributes including
1992 // the name of the attribute, its type, and a short description.
1993 //
1994 // Input parameters:
1995 // mgr - GC memory manager
1996 // info - caller allocated array of jmmExtAttributeInfo
1997 // count - number of elements of the info array
1998 //
1999 // Returns the number of GC extension attributes filled in the info array; or
2000 // -1 if info is not big enough
2001 //
2002 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
2003 // All GC memory managers have 1 attribute (number of GC threads)
2004 if (count == 0) {
2005 return 0;
2006 }
2007
2008 if (info == NULL) {
2009 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
2010 }
2011
2012 info[0].name = "GcThreadCount";
2013 info[0].type = 'I';
2014 info[0].description = "Number of GC threads";
2015 return 1;
2016 JVM_END
2017
2018 // verify the given array is an array of java/lang/management/MemoryUsage objects
2019 // of a given length and return the objArrayOop
2020 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
2021 if (array == NULL) {
2022 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
2023 }
2024
2025 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
2026 objArrayHandle array_h(THREAD, oa);
2027
2028 // array must be of the given length
2029 if (length != array_h->length()) {
2030 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2031 "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
2032 }
2033
2034 // check if the element of array is of type MemoryUsage class
2035 klassOop usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
2036 klassOop element_klass = objArrayKlass::cast(array_h->klass())->element_klass();
2037 if (element_klass != usage_klass) {
2038 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
2039 "The element type is not MemoryUsage class", 0);
2040 }
2041
2042 return array_h();
2043 }
2044
2045 // Gets the statistics of the last GC of a given GC memory manager.
2046 // Input parameters:
2047 // obj - GarbageCollectorMXBean object
2048 // gc_stat - caller allocated jmmGCStat where:
2049 // a. before_gc_usage - array of MemoryUsage objects
2050 // b. after_gc_usage - array of MemoryUsage objects
2051 // c. gc_ext_attributes_values_size is set to the
2052 // gc_ext_attribute_values array allocated
2053 // d. gc_ext_attribute_values is a caller allocated array of jvalue.
2054 //
2055 // On return,
2056 // gc_index == 0 indicates no GC statistics available
2057 //
2058 // before_gc_usage and after_gc_usage - filled with per memory pool
2059 // before and after GC usage in the same order as the memory pools
2060 // returned by GetMemoryPools for a given GC memory manager.
2061 // num_gc_ext_attributes indicates the number of elements in
2062 // the gc_ext_attribute_values array is filled; or
2063 // -1 if the gc_ext_attributes_values array is not big enough
2064 //
2065 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
2066 ResourceMark rm(THREAD);
2067
2068 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
2069 THROW(vmSymbols::java_lang_NullPointerException());
2070 }
2071
2072 // Get the GCMemoryManager
2073 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
2074
2075 // Make a copy of the last GC statistics
2076 // GC may occur while constructing the last GC information
2077 int num_pools = MemoryService::num_memory_pools();
2078 GCStatInfo stat(num_pools);
2079 if (mgr->get_last_gc_stat(&stat) == 0) {
2080 gc_stat->gc_index = 0;
2081 return;
2082 }
2083
2084 gc_stat->gc_index = stat.gc_index();
2085 gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
2086 gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
2087
2088 // Current implementation does not have GC extension attributes
2089 gc_stat->num_gc_ext_attributes = 0;
2090
2091 // Fill the arrays of MemoryUsage objects with before and after GC
2092 // per pool memory usage
2093 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
2094 num_pools,
2095 CHECK);
2096 objArrayHandle usage_before_gc_ah(THREAD, bu);
2097
2098 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
2099 num_pools,
2100 CHECK);
2101 objArrayHandle usage_after_gc_ah(THREAD, au);
2102
2103 for (int i = 0; i < num_pools; i++) {
2104 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
2105 Handle after_usage;
2106
2107 MemoryUsage u = stat.after_gc_usage_for_pool(i);
2108 if (u.max_size() == 0 && u.used() > 0) {
2109 // If max size == 0, this pool is a survivor space.
2110 // Set max size = -1 since the pools will be swapped after GC.
2111 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
2112 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
2113 } else {
2114 after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
2115 }
2116 usage_before_gc_ah->obj_at_put(i, before_usage());
2117 usage_after_gc_ah->obj_at_put(i, after_usage());
2118 }
2119
2120 if (gc_stat->gc_ext_attribute_values_size > 0) {
2121 // Current implementation only has 1 attribute (number of GC threads)
2122 // The type is 'I'
2123 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
2124 }
2125 JVM_END
2126
2127 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
2128 ResourceMark rm(THREAD);
2129 // Get the GCMemoryManager
2130 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
2131 mgr->set_notification_enabled(enabled?true:false);
2132 JVM_END
2133
2134 // Dump heap - Returns 0 if succeeds.
2135 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
2136 ResourceMark rm(THREAD);
2137 oop on = JNIHandles::resolve_external_guard(outputfile);
2138 if (on == NULL) {
2139 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
2140 "Output file name cannot be null.", -1);
2141 }
2142 char* name = java_lang_String::as_utf8_string(on);
2143 if (name == NULL) {
2144 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
2145 "Output file name cannot be null.", -1);
2146 }
2147 HeapDumper dumper(live ? true : false);
2148 if (dumper.dump(name) != 0) {
2149 const char* errmsg = dumper.error_as_C_string();
2150 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
2151 }
2152 return 0;
2153 JVM_END
2154
2155 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
2156 ResourceMark rm(THREAD);
2157 GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list();
2158 objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
2159 dcmd_list->length(), CHECK_NULL);
2160 objArrayHandle cmd_array(THREAD, cmd_array_oop);
2161 for (int i = 0; i < dcmd_list->length(); i++) {
2162 oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
2163 cmd_array->obj_at_put(i, cmd_name);
2164 }
2165 return (jobjectArray) JNIHandles::make_local(env, cmd_array());
2166 JVM_END
2167
2168 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
2169 dcmdInfo* infoArray))
2170 if (cmds == NULL || infoArray == NULL) {
2171 THROW(vmSymbols::java_lang_NullPointerException());
2172 }
2173
2174 ResourceMark rm(THREAD);
2175
2176 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
2177 objArrayHandle cmds_ah(THREAD, ca);
2178
2179 // Make sure we have a String array
2180 klassOop element_klass = objArrayKlass::cast(cmds_ah->klass())->element_klass();
2181 if (element_klass != SystemDictionary::String_klass()) {
2182 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2183 "Array element type is not String class");
2184 }
2185
2186 GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list();
2187
2188 int num_cmds = cmds_ah->length();
2189 for (int i = 0; i < num_cmds; i++) {
2190 oop cmd = cmds_ah->obj_at(i);
2191 if (cmd == NULL) {
2192 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2193 "Command name cannot be null.");
2194 }
2195 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2196 if (cmd_name == NULL) {
2197 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2198 "Command name cannot be null.");
2199 }
2200 int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
2201 if (pos == -1) {
2202 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2203 "Unknown diagnostic command");
2204 }
2205 DCmdInfo* info = info_list->at(pos);
2206 infoArray[i].name = info->name();
2207 infoArray[i].description = info->description();
2208 infoArray[i].impact = info->impact();
2209 infoArray[i].num_arguments = info->num_arguments();
2210 infoArray[i].enabled = info->is_enabled();
2211 }
2212 JVM_END
2213
2214 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2215 jstring command, dcmdArgInfo* infoArray))
2216 ResourceMark rm(THREAD);
2217 oop cmd = JNIHandles::resolve_external_guard(command);
2218 if (cmd == NULL) {
2219 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2220 "Command line cannot be null.");
2221 }
2222 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2223 if (cmd_name == NULL) {
2224 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2225 "Command line content cannot be null.");
2226 }
2227 DCmd* dcmd = NULL;
2228 DCmdFactory*factory = DCmdFactory::factory(cmd_name, strlen(cmd_name));
2229 if (factory != NULL) {
2230 dcmd = factory->create_resource_instance(NULL);
2231 }
2232 if (dcmd == NULL) {
2233 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2234 "Unknown diagnostic command");
2235 }
2236 DCmdMark mark(dcmd);
2237 GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2238 if (array->length() == 0) {
2239 return;
2240 }
2241 for (int i = 0; i < array->length(); i++) {
2242 infoArray[i].name = array->at(i)->name();
2243 infoArray[i].description = array->at(i)->description();
2244 infoArray[i].type = array->at(i)->type();
2245 infoArray[i].default_string = array->at(i)->default_string();
2246 infoArray[i].mandatory = array->at(i)->is_mandatory();
2247 infoArray[i].option = array->at(i)->is_option();
2248 infoArray[i].position = array->at(i)->position();
2249 }
2250 return;
2251 JVM_END
2252
2253 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2254 ResourceMark rm(THREAD);
2255 oop cmd = JNIHandles::resolve_external_guard(commandline);
2256 if (cmd == NULL) {
2257 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2258 "Command line cannot be null.");
2259 }
2260 char* cmdline = java_lang_String::as_utf8_string(cmd);
2261 if (cmdline == NULL) {
2262 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2263 "Command line content cannot be null.");
2264 }
2265 bufferedStream output;
2266 DCmd::parse_and_execute(&output, cmdline, ' ', CHECK_NULL);
2267 oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2268 return (jstring) JNIHandles::make_local(env, result);
2269 JVM_END
2270
2271 jlong Management::ticks_to_ms(jlong ticks) {
2272 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2273 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2274 * (double)1000.0);
2275 }
2276
2277 const struct jmmInterface_1_ jmm_interface = {
2278 NULL,
2279 NULL,
2280 jmm_GetVersion,
2281 jmm_GetOptionalSupport,
2282 jmm_GetInputArguments,
2283 jmm_GetThreadInfo,
2284 jmm_GetInputArgumentArray,
2285 jmm_GetMemoryPools,
2286 jmm_GetMemoryManagers,
2287 jmm_GetMemoryPoolUsage,
2288 jmm_GetPeakMemoryPoolUsage,
2289 jmm_GetThreadAllocatedMemory,
2290 jmm_GetMemoryUsage,
2291 jmm_GetLongAttribute,
2292 jmm_GetBoolAttribute,
2293 jmm_SetBoolAttribute,
2294 jmm_GetLongAttributes,
2295 jmm_FindMonitorDeadlockedThreads,
2296 jmm_GetThreadCpuTime,
2297 jmm_GetVMGlobalNames,
2298 jmm_GetVMGlobals,
2299 jmm_GetInternalThreadTimes,
2300 jmm_ResetStatistic,
2301 jmm_SetPoolSensor,
2302 jmm_SetPoolThreshold,
2303 jmm_GetPoolCollectionUsage,
2304 jmm_GetGCExtAttributeInfo,
2305 jmm_GetLastGCStat,
2306 jmm_GetThreadCpuTimeWithKind,
2307 jmm_GetThreadCpuTimesWithKind,
2308 jmm_DumpHeap0,
2309 jmm_FindDeadlockedThreads,
2310 jmm_SetVMGlobal,
2311 NULL,
2312 jmm_DumpThreads,
2313 jmm_SetGCNotificationEnabled,
2314 jmm_GetDiagnosticCommands,
2315 jmm_GetDiagnosticCommandInfo,
2316 jmm_GetDiagnosticCommandArgumentsInfo,
2317 jmm_ExecuteDiagnosticCommand
2318 };
2319
2320 void* Management::get_jmm_interface(int version) {
2321 if (version == JMM_VERSION_1_0) {
2322 return (void*) &jmm_interface;
2323 }
2324 return NULL;
2325 }