1 /*
2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "compiler/compileBroker.hpp"
28 #include "memory/iterator.hpp"
29 #include "memory/oopFactory.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "oops/klass.hpp"
32 #include "oops/objArrayKlass.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "runtime/arguments.hpp"
35 #include "runtime/globals.hpp"
36 #include "runtime/handles.inline.hpp"
37 #include "runtime/interfaceSupport.hpp"
38 #include "runtime/javaCalls.hpp"
39 #include "runtime/jniHandles.hpp"
40 #include "runtime/os.hpp"
41 #include "runtime/serviceThread.hpp"
42 #include "services/classLoadingService.hpp"
43 #include "services/diagnosticCommand.hpp"
44 #include "services/diagnosticFramework.hpp"
45 #include "services/heapDumper.hpp"
46 #include "services/jmm.h"
47 #include "services/lowMemoryDetector.hpp"
48 #include "services/gcNotifier.hpp"
49 #include "services/nmtDCmd.hpp"
50 #include "services/management.hpp"
51 #include "services/memoryManager.hpp"
52 #include "services/memoryPool.hpp"
53 #include "services/memoryService.hpp"
54 #include "services/runtimeService.hpp"
55 #include "services/threadService.hpp"
56
57 PerfVariable* Management::_begin_vm_creation_time = NULL;
58 PerfVariable* Management::_end_vm_creation_time = NULL;
59 PerfVariable* Management::_vm_init_done_time = NULL;
60
61 Klass* Management::_sensor_klass = NULL;
62 Klass* Management::_threadInfo_klass = NULL;
63 Klass* Management::_memoryUsage_klass = NULL;
64 Klass* Management::_memoryPoolMXBean_klass = NULL;
65 Klass* Management::_memoryManagerMXBean_klass = NULL;
66 Klass* Management::_garbageCollectorMXBean_klass = NULL;
67 Klass* Management::_managementFactory_klass = NULL;
68 Klass* Management::_garbageCollectorImpl_klass = NULL;
69 Klass* Management::_gcInfo_klass = NULL;
70
71 jmmOptionalSupport Management::_optional_support = {0};
72 TimeStamp Management::_stamp;
73
74 void management_init() {
75 Management::init();
76 ThreadService::init();
77 RuntimeService::init();
78 ClassLoadingService::init();
79 }
80
81 void Management::init() {
82 EXCEPTION_MARK;
83
84 // These counters are for java.lang.management API support.
85 // They are created even if -XX:-UsePerfData is set and in
86 // that case, they will be allocated on C heap.
87
88 _begin_vm_creation_time =
89 PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
90 PerfData::U_None, CHECK);
91
92 _end_vm_creation_time =
93 PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
94 PerfData::U_None, CHECK);
95
96 _vm_init_done_time =
97 PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
98 PerfData::U_None, CHECK);
99
100 // Initialize optional support
101 _optional_support.isLowMemoryDetectionSupported = 1;
102 _optional_support.isCompilationTimeMonitoringSupported = 1;
103 _optional_support.isThreadContentionMonitoringSupported = 1;
104
105 if (os::is_thread_cpu_time_supported()) {
106 _optional_support.isCurrentThreadCpuTimeSupported = 1;
107 _optional_support.isOtherThreadCpuTimeSupported = 1;
108 } else {
109 _optional_support.isCurrentThreadCpuTimeSupported = 0;
110 _optional_support.isOtherThreadCpuTimeSupported = 0;
111 }
112
113 _optional_support.isBootClassPathSupported = 1;
114 _optional_support.isObjectMonitorUsageSupported = 1;
115 #ifndef SERVICES_KERNEL
116 // This depends on the heap inspector
117 _optional_support.isSynchronizerUsageSupported = 1;
118 #endif // SERVICES_KERNEL
119 _optional_support.isThreadAllocatedMemorySupported = 1;
120
121 // Registration of the diagnostic commands
122 DCmdRegistrant::register_dcmds();
123 DCmdRegistrant::register_dcmds_ext();
124 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(true, false));
125 }
126
127 void Management::initialize(TRAPS) {
128 // Start the service thread
129 ServiceThread::initialize();
130
131 if (ManagementServer) {
132 ResourceMark rm(THREAD);
133 HandleMark hm(THREAD);
134
135 // Load and initialize the sun.management.Agent class
136 // invoke startAgent method to start the management server
137 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
138 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::sun_management_Agent(),
139 loader,
140 Handle(),
141 true,
142 CHECK);
143 instanceKlassHandle ik (THREAD, k);
144
145 JavaValue result(T_VOID);
146 JavaCalls::call_static(&result,
147 ik,
148 vmSymbols::startAgent_name(),
149 vmSymbols::void_method_signature(),
150 CHECK);
151 }
152 }
153
154 void Management::get_optional_support(jmmOptionalSupport* support) {
155 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
156 }
157
158 Klass* Management::load_and_initialize_klass(Symbol* sh, TRAPS) {
159 Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
160 instanceKlassHandle ik (THREAD, k);
161 if (ik->should_be_initialized()) {
162 ik->initialize(CHECK_NULL);
163 }
164 // If these classes change to not be owned by the boot loader, they need
165 // to be walked to keep their class loader alive in oops_do.
166 assert(ik->class_loader() == NULL, "need to follow in oops_do");
167 return ik();
168 }
169
170 void Management::record_vm_startup_time(jlong begin, jlong duration) {
171 // if the performance counter is not initialized,
172 // then vm initialization failed; simply return.
173 if (_begin_vm_creation_time == NULL) return;
174
175 _begin_vm_creation_time->set_value(begin);
176 _end_vm_creation_time->set_value(begin + duration);
177 PerfMemory::set_accessible(true);
178 }
179
180 jlong Management::timestamp() {
181 TimeStamp t;
182 t.update();
183 return t.ticks() - _stamp.ticks();
184 }
185
186 void Management::oops_do(OopClosure* f) {
187 MemoryService::oops_do(f);
188 ThreadService::oops_do(f);
189 }
190
191 Klass* Management::java_lang_management_ThreadInfo_klass(TRAPS) {
192 if (_threadInfo_klass == NULL) {
193 _threadInfo_klass = load_and_initialize_klass(vmSymbols::java_lang_management_ThreadInfo(), CHECK_NULL);
194 }
195 return _threadInfo_klass;
196 }
197
198 Klass* Management::java_lang_management_MemoryUsage_klass(TRAPS) {
199 if (_memoryUsage_klass == NULL) {
200 _memoryUsage_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryUsage(), CHECK_NULL);
201 }
202 return _memoryUsage_klass;
203 }
204
205 Klass* Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
206 if (_memoryPoolMXBean_klass == NULL) {
207 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
208 }
209 return _memoryPoolMXBean_klass;
210 }
211
212 Klass* Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
213 if (_memoryManagerMXBean_klass == NULL) {
214 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
215 }
216 return _memoryManagerMXBean_klass;
217 }
218
219 Klass* Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
220 if (_garbageCollectorMXBean_klass == NULL) {
221 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbols::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
222 }
223 return _garbageCollectorMXBean_klass;
224 }
225
226 Klass* Management::sun_management_Sensor_klass(TRAPS) {
227 if (_sensor_klass == NULL) {
228 _sensor_klass = load_and_initialize_klass(vmSymbols::sun_management_Sensor(), CHECK_NULL);
229 }
230 return _sensor_klass;
231 }
232
233 Klass* Management::sun_management_ManagementFactory_klass(TRAPS) {
234 if (_managementFactory_klass == NULL) {
235 _managementFactory_klass = load_and_initialize_klass(vmSymbols::sun_management_ManagementFactory(), CHECK_NULL);
236 }
237 return _managementFactory_klass;
238 }
239
240 Klass* Management::sun_management_GarbageCollectorImpl_klass(TRAPS) {
241 if (_garbageCollectorImpl_klass == NULL) {
242 _garbageCollectorImpl_klass = load_and_initialize_klass(vmSymbols::sun_management_GarbageCollectorImpl(), CHECK_NULL);
243 }
244 return _garbageCollectorImpl_klass;
245 }
246
247 Klass* Management::com_sun_management_GcInfo_klass(TRAPS) {
248 if (_gcInfo_klass == NULL) {
249 _gcInfo_klass = load_and_initialize_klass(vmSymbols::com_sun_management_GcInfo(), CHECK_NULL);
250 }
251 return _gcInfo_klass;
252 }
253
254 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
255 Handle snapshot_thread(THREAD, snapshot->threadObj());
256
257 jlong contended_time;
258 jlong waited_time;
259 if (ThreadService::is_thread_monitoring_contention()) {
260 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
261 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
262 } else {
263 // set them to -1 if thread contention monitoring is disabled.
264 contended_time = max_julong;
265 waited_time = max_julong;
266 }
267
268 int thread_status = snapshot->thread_status();
269 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
270 if (snapshot->is_ext_suspended()) {
271 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
272 }
273 if (snapshot->is_in_native()) {
274 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
275 }
276
277 ThreadStackTrace* st = snapshot->get_stack_trace();
278 Handle stacktrace_h;
279 if (st != NULL) {
280 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
281 } else {
282 stacktrace_h = Handle();
283 }
284
285 args->push_oop(snapshot_thread);
286 args->push_int(thread_status);
287 args->push_oop(Handle(THREAD, snapshot->blocker_object()));
288 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
289 args->push_long(snapshot->contended_enter_count());
290 args->push_long(contended_time);
291 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
292 args->push_long(waited_time);
293 args->push_oop(stacktrace_h);
294 }
295
296 // Helper function to construct a ThreadInfo object
297 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
298 Klass* k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
299 instanceKlassHandle ik (THREAD, k);
300
301 JavaValue result(T_VOID);
302 JavaCallArguments args(14);
303
304 // First allocate a ThreadObj object and
305 // push the receiver as the first argument
306 Handle element = ik->allocate_instance_handle(CHECK_NULL);
307 args.push_oop(element);
308
309 // initialize the arguments for the ThreadInfo constructor
310 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
311
312 // Call ThreadInfo constructor with no locked monitors and synchronizers
313 JavaCalls::call_special(&result,
314 ik,
315 vmSymbols::object_initializer_name(),
316 vmSymbols::java_lang_management_ThreadInfo_constructor_signature(),
317 &args,
318 CHECK_NULL);
319
320 return (instanceOop) element();
321 }
322
323 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
324 objArrayHandle monitors_array,
325 typeArrayHandle depths_array,
326 objArrayHandle synchronizers_array,
327 TRAPS) {
328 Klass* k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
329 instanceKlassHandle ik (THREAD, k);
330
331 JavaValue result(T_VOID);
332 JavaCallArguments args(17);
333
334 // First allocate a ThreadObj object and
335 // push the receiver as the first argument
336 Handle element = ik->allocate_instance_handle(CHECK_NULL);
337 args.push_oop(element);
338
339 // initialize the arguments for the ThreadInfo constructor
340 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
341
342 // push the locked monitors and synchronizers in the arguments
343 args.push_oop(monitors_array);
344 args.push_oop(depths_array);
345 args.push_oop(synchronizers_array);
346
347 // Call ThreadInfo constructor with locked monitors and synchronizers
348 JavaCalls::call_special(&result,
349 ik,
350 vmSymbols::object_initializer_name(),
351 vmSymbols::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
352 &args,
353 CHECK_NULL);
354
355 return (instanceOop) element();
356 }
357
358 // Helper functions
359 static JavaThread* find_java_thread_from_id(jlong thread_id) {
360 assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
361
362 JavaThread* java_thread = NULL;
363 // Sequential search for now. Need to do better optimization later.
364 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
365 oop tobj = thread->threadObj();
366 if (!thread->is_exiting() &&
367 tobj != NULL &&
368 thread_id == java_lang_Thread::thread_id(tobj)) {
369 java_thread = thread;
370 break;
371 }
372 }
373 return java_thread;
374 }
375
376 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
377 if (mgr == NULL) {
378 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
379 }
380 oop mgr_obj = JNIHandles::resolve(mgr);
381 instanceHandle h(THREAD, (instanceOop) mgr_obj);
382
383 Klass* k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
384 if (!h->is_a(k)) {
385 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
386 "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
387 NULL);
388 }
389
390 MemoryManager* gc = MemoryService::get_memory_manager(h);
391 if (gc == NULL || !gc->is_gc_memory_manager()) {
392 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
393 "Invalid GC memory manager",
394 NULL);
395 }
396 return (GCMemoryManager*) gc;
397 }
398
399 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
400 if (obj == NULL) {
401 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
402 }
403
404 oop pool_obj = JNIHandles::resolve(obj);
405 assert(pool_obj->is_instance(), "Should be an instanceOop");
406 instanceHandle ph(THREAD, (instanceOop) pool_obj);
407
408 return MemoryService::get_memory_pool(ph);
409 }
410
411 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
412 int num_threads = ids_ah->length();
413
414 // Validate input thread IDs
415 int i = 0;
416 for (i = 0; i < num_threads; i++) {
417 jlong tid = ids_ah->long_at(i);
418 if (tid <= 0) {
419 // throw exception if invalid thread id.
420 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
421 "Invalid thread ID entry");
422 }
423 }
424 }
425
426 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
427 // check if the element of infoArray is of type ThreadInfo class
428 Klass* threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
429 Klass* element_klass = objArrayKlass::cast(infoArray_h->klass())->element_klass();
430 if (element_klass != threadinfo_klass) {
431 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
432 "infoArray element type is not ThreadInfo class");
433 }
434 }
435
436
437 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
438 if (obj == NULL) {
439 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
440 }
441
442 oop mgr_obj = JNIHandles::resolve(obj);
443 assert(mgr_obj->is_instance(), "Should be an instanceOop");
444 instanceHandle mh(THREAD, (instanceOop) mgr_obj);
445
446 return MemoryService::get_memory_manager(mh);
447 }
448
449 // Returns a version string and sets major and minor version if
450 // the input parameters are non-null.
451 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
452 return JMM_VERSION;
453 JVM_END
454
455 // Gets the list of VM monitoring and management optional supports
456 // Returns 0 if succeeded; otherwise returns non-zero.
457 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
458 if (support == NULL) {
459 return -1;
460 }
461 Management::get_optional_support(support);
462 return 0;
463 JVM_END
464
465 // Returns a java.lang.String object containing the input arguments to the VM.
466 JVM_ENTRY(jobject, jmm_GetInputArguments(JNIEnv *env))
467 ResourceMark rm(THREAD);
468
469 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
470 return NULL;
471 }
472
473 char** vm_flags = Arguments::jvm_flags_array();
474 char** vm_args = Arguments::jvm_args_array();
475 int num_flags = Arguments::num_jvm_flags();
476 int num_args = Arguments::num_jvm_args();
477
478 size_t length = 1; // null terminator
479 int i;
480 for (i = 0; i < num_flags; i++) {
481 length += strlen(vm_flags[i]);
482 }
483 for (i = 0; i < num_args; i++) {
484 length += strlen(vm_args[i]);
485 }
486 // add a space between each argument
487 length += num_flags + num_args - 1;
488
489 // Return the list of input arguments passed to the VM
490 // and preserve the order that the VM processes.
491 char* args = NEW_RESOURCE_ARRAY(char, length);
492 args[0] = '\0';
493 // concatenate all jvm_flags
494 if (num_flags > 0) {
495 strcat(args, vm_flags[0]);
496 for (i = 1; i < num_flags; i++) {
497 strcat(args, " ");
498 strcat(args, vm_flags[i]);
499 }
500 }
501
502 if (num_args > 0 && num_flags > 0) {
503 // append a space if args already contains one or more jvm_flags
504 strcat(args, " ");
505 }
506
507 // concatenate all jvm_args
508 if (num_args > 0) {
509 strcat(args, vm_args[0]);
510 for (i = 1; i < num_args; i++) {
511 strcat(args, " ");
512 strcat(args, vm_args[i]);
513 }
514 }
515
516 Handle hargs = java_lang_String::create_from_platform_dependent_str(args, CHECK_NULL);
517 return JNIHandles::make_local(env, hargs());
518 JVM_END
519
520 // Returns an array of java.lang.String object containing the input arguments to the VM.
521 JVM_ENTRY(jobjectArray, jmm_GetInputArgumentArray(JNIEnv *env))
522 ResourceMark rm(THREAD);
523
524 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
525 return NULL;
526 }
527
528 char** vm_flags = Arguments::jvm_flags_array();
529 char** vm_args = Arguments::jvm_args_array();
530 int num_flags = Arguments::num_jvm_flags();
531 int num_args = Arguments::num_jvm_args();
532
533 instanceKlassHandle ik (THREAD, SystemDictionary::String_klass());
534 objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL);
535 objArrayHandle result_h(THREAD, r);
536
537 int index = 0;
538 for (int j = 0; j < num_flags; j++, index++) {
539 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
540 result_h->obj_at_put(index, h());
541 }
542 for (int i = 0; i < num_args; i++, index++) {
543 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
544 result_h->obj_at_put(index, h());
545 }
546 return (jobjectArray) JNIHandles::make_local(env, result_h());
547 JVM_END
548
549 // Returns an array of java/lang/management/MemoryPoolMXBean object
550 // one for each memory pool if obj == null; otherwise returns
551 // an array of memory pools for a given memory manager if
552 // it is a valid memory manager.
553 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
554 ResourceMark rm(THREAD);
555
556 int num_memory_pools;
557 MemoryManager* mgr = NULL;
558 if (obj == NULL) {
559 num_memory_pools = MemoryService::num_memory_pools();
560 } else {
561 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
562 if (mgr == NULL) {
563 return NULL;
564 }
565 num_memory_pools = mgr->num_memory_pools();
566 }
567
568 // Allocate the resulting MemoryPoolMXBean[] object
569 Klass* k = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
570 instanceKlassHandle ik (THREAD, k);
571 objArrayOop r = oopFactory::new_objArray(ik(), num_memory_pools, CHECK_NULL);
572 objArrayHandle poolArray(THREAD, r);
573
574 if (mgr == NULL) {
575 // Get all memory pools
576 for (int i = 0; i < num_memory_pools; i++) {
577 MemoryPool* pool = MemoryService::get_memory_pool(i);
578 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
579 instanceHandle ph(THREAD, p);
580 poolArray->obj_at_put(i, ph());
581 }
582 } else {
583 // Get memory pools managed by a given memory manager
584 for (int i = 0; i < num_memory_pools; i++) {
585 MemoryPool* pool = mgr->get_memory_pool(i);
586 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
587 instanceHandle ph(THREAD, p);
588 poolArray->obj_at_put(i, ph());
589 }
590 }
591 return (jobjectArray) JNIHandles::make_local(env, poolArray());
592 JVM_END
593
594 // Returns an array of java/lang/management/MemoryManagerMXBean object
595 // one for each memory manager if obj == null; otherwise returns
596 // an array of memory managers for a given memory pool if
597 // it is a valid memory pool.
598 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
599 ResourceMark rm(THREAD);
600
601 int num_mgrs;
602 MemoryPool* pool = NULL;
603 if (obj == NULL) {
604 num_mgrs = MemoryService::num_memory_managers();
605 } else {
606 pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
607 if (pool == NULL) {
608 return NULL;
609 }
610 num_mgrs = pool->num_memory_managers();
611 }
612
613 // Allocate the resulting MemoryManagerMXBean[] object
614 Klass* k = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
615 instanceKlassHandle ik (THREAD, k);
616 objArrayOop r = oopFactory::new_objArray(ik(), num_mgrs, CHECK_NULL);
617 objArrayHandle mgrArray(THREAD, r);
618
619 if (pool == NULL) {
620 // Get all memory managers
621 for (int i = 0; i < num_mgrs; i++) {
622 MemoryManager* mgr = MemoryService::get_memory_manager(i);
623 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
624 instanceHandle ph(THREAD, p);
625 mgrArray->obj_at_put(i, ph());
626 }
627 } else {
628 // Get memory managers for a given memory pool
629 for (int i = 0; i < num_mgrs; i++) {
630 MemoryManager* mgr = pool->get_memory_manager(i);
631 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
632 instanceHandle ph(THREAD, p);
633 mgrArray->obj_at_put(i, ph());
634 }
635 }
636 return (jobjectArray) JNIHandles::make_local(env, mgrArray());
637 JVM_END
638
639
640 // Returns a java/lang/management/MemoryUsage object containing the memory usage
641 // of a given memory pool.
642 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
643 ResourceMark rm(THREAD);
644
645 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
646 if (pool != NULL) {
647 MemoryUsage usage = pool->get_memory_usage();
648 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
649 return JNIHandles::make_local(env, h());
650 } else {
651 return NULL;
652 }
653 JVM_END
654
655 // Returns a java/lang/management/MemoryUsage object containing the memory usage
656 // of a given memory pool.
657 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
658 ResourceMark rm(THREAD);
659
660 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
661 if (pool != NULL) {
662 MemoryUsage usage = pool->get_peak_memory_usage();
663 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
664 return JNIHandles::make_local(env, h());
665 } else {
666 return NULL;
667 }
668 JVM_END
669
670 // Returns a java/lang/management/MemoryUsage object containing the memory usage
671 // of a given memory pool after most recent GC.
672 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
673 ResourceMark rm(THREAD);
674
675 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
676 if (pool != NULL && pool->is_collected_pool()) {
677 MemoryUsage usage = pool->get_last_collection_usage();
678 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
679 return JNIHandles::make_local(env, h());
680 } else {
681 return NULL;
682 }
683 JVM_END
684
685 // Sets the memory pool sensor for a threshold type
686 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
687 if (obj == NULL || sensorObj == NULL) {
688 THROW(vmSymbols::java_lang_NullPointerException());
689 }
690
691 Klass* sensor_klass = Management::sun_management_Sensor_klass(CHECK);
692 oop s = JNIHandles::resolve(sensorObj);
693 assert(s->is_instance(), "Sensor should be an instanceOop");
694 instanceHandle sensor_h(THREAD, (instanceOop) s);
695 if (!sensor_h->is_a(sensor_klass)) {
696 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
697 "Sensor is not an instance of sun.management.Sensor class");
698 }
699
700 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
701 assert(mpool != NULL, "MemoryPool should exist");
702
703 switch (type) {
704 case JMM_USAGE_THRESHOLD_HIGH:
705 case JMM_USAGE_THRESHOLD_LOW:
706 // have only one sensor for threshold high and low
707 mpool->set_usage_sensor_obj(sensor_h);
708 break;
709 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
710 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
711 // have only one sensor for threshold high and low
712 mpool->set_gc_usage_sensor_obj(sensor_h);
713 break;
714 default:
715 assert(false, "Unrecognized type");
716 }
717
718 JVM_END
719
720
721 // Sets the threshold of a given memory pool.
722 // Returns the previous threshold.
723 //
724 // Input parameters:
725 // pool - the MemoryPoolMXBean object
726 // type - threshold type
727 // threshold - the new threshold (must not be negative)
728 //
729 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
730 if (threshold < 0) {
731 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
732 "Invalid threshold value",
733 -1);
734 }
735
736 if ((size_t)threshold > max_uintx) {
737 stringStream st;
738 st.print("Invalid valid threshold value. Threshold value (" UINT64_FORMAT ") > max value of size_t (" SIZE_FORMAT ")", (size_t)threshold, max_uintx);
739 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
740 }
741
742 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
743 assert(pool != NULL, "MemoryPool should exist");
744
745 jlong prev = 0;
746 switch (type) {
747 case JMM_USAGE_THRESHOLD_HIGH:
748 if (!pool->usage_threshold()->is_high_threshold_supported()) {
749 return -1;
750 }
751 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
752 break;
753
754 case JMM_USAGE_THRESHOLD_LOW:
755 if (!pool->usage_threshold()->is_low_threshold_supported()) {
756 return -1;
757 }
758 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
759 break;
760
761 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
762 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
763 return -1;
764 }
765 // return and the new threshold is effective for the next GC
766 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
767
768 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
769 if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
770 return -1;
771 }
772 // return and the new threshold is effective for the next GC
773 return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
774
775 default:
776 assert(false, "Unrecognized type");
777 return -1;
778 }
779
780 // When the threshold is changed, reevaluate if the low memory
781 // detection is enabled.
782 if (prev != threshold) {
783 LowMemoryDetector::recompute_enabled_for_collected_pools();
784 LowMemoryDetector::detect_low_memory(pool);
785 }
786 return prev;
787 JVM_END
788
789 // Gets an array containing the amount of memory allocated on the Java
790 // heap for a set of threads (in bytes). Each element of the array is
791 // the amount of memory allocated for the thread ID specified in the
792 // corresponding entry in the given array of thread IDs; or -1 if the
793 // thread does not exist or has terminated.
794 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
795 jlongArray sizeArray))
796 // Check if threads is null
797 if (ids == NULL || sizeArray == NULL) {
798 THROW(vmSymbols::java_lang_NullPointerException());
799 }
800
801 ResourceMark rm(THREAD);
802 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
803 typeArrayHandle ids_ah(THREAD, ta);
804
805 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
806 typeArrayHandle sizeArray_h(THREAD, sa);
807
808 // validate the thread id array
809 validate_thread_id_array(ids_ah, CHECK);
810
811 // sizeArray must be of the same length as the given array of thread IDs
812 int num_threads = ids_ah->length();
813 if (num_threads != sizeArray_h->length()) {
814 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
815 "The length of the given long array does not match the length of "
816 "the given array of thread IDs");
817 }
818
819 MutexLockerEx ml(Threads_lock);
820 for (int i = 0; i < num_threads; i++) {
821 JavaThread* java_thread = find_java_thread_from_id(ids_ah->long_at(i));
822 if (java_thread != NULL) {
823 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
824 }
825 }
826 JVM_END
827
828 // Returns a java/lang/management/MemoryUsage object representing
829 // the memory usage for the heap or non-heap memory.
830 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
831 ResourceMark rm(THREAD);
832
833 // Calculate the memory usage
834 size_t total_init = 0;
835 size_t total_used = 0;
836 size_t total_committed = 0;
837 size_t total_max = 0;
838 bool has_undefined_init_size = false;
839 bool has_undefined_max_size = false;
840
841 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
842 MemoryPool* pool = MemoryService::get_memory_pool(i);
843 if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
844 MemoryUsage u = pool->get_memory_usage();
845 total_used += u.used();
846 total_committed += u.committed();
847
848 // if any one of the memory pool has undefined init_size or max_size,
849 // set it to -1
850 if (u.init_size() == (size_t)-1) {
851 has_undefined_init_size = true;
852 }
853 if (!has_undefined_init_size) {
854 total_init += u.init_size();
855 }
856
857 if (u.max_size() == (size_t)-1) {
858 has_undefined_max_size = true;
859 }
860 if (!has_undefined_max_size) {
861 total_max += u.max_size();
862 }
863 }
864 }
865
866 // In our current implementation, we make sure that all non-heap
867 // pools have defined init and max sizes. Heap pools do not matter,
868 // as we never use total_init and total_max for them.
869 assert(heap || !has_undefined_init_size, "Undefined init size");
870 assert(heap || !has_undefined_max_size, "Undefined max size");
871
872 MemoryUsage usage((heap ? InitialHeapSize : total_init),
873 total_used,
874 total_committed,
875 (heap ? Universe::heap()->max_capacity() : total_max));
876
877 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
878 return JNIHandles::make_local(env, obj());
879 JVM_END
880
881 // Returns the boolean value of a given attribute.
882 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
883 switch (att) {
884 case JMM_VERBOSE_GC:
885 return MemoryService::get_verbose();
886 case JMM_VERBOSE_CLASS:
887 return ClassLoadingService::get_verbose();
888 case JMM_THREAD_CONTENTION_MONITORING:
889 return ThreadService::is_thread_monitoring_contention();
890 case JMM_THREAD_CPU_TIME:
891 return ThreadService::is_thread_cpu_time_enabled();
892 case JMM_THREAD_ALLOCATED_MEMORY:
893 return ThreadService::is_thread_allocated_memory_enabled();
894 default:
895 assert(0, "Unrecognized attribute");
896 return false;
897 }
898 JVM_END
899
900 // Sets the given boolean attribute and returns the previous value.
901 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
902 switch (att) {
903 case JMM_VERBOSE_GC:
904 return MemoryService::set_verbose(flag != 0);
905 case JMM_VERBOSE_CLASS:
906 return ClassLoadingService::set_verbose(flag != 0);
907 case JMM_THREAD_CONTENTION_MONITORING:
908 return ThreadService::set_thread_monitoring_contention(flag != 0);
909 case JMM_THREAD_CPU_TIME:
910 return ThreadService::set_thread_cpu_time_enabled(flag != 0);
911 case JMM_THREAD_ALLOCATED_MEMORY:
912 return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
913 default:
914 assert(0, "Unrecognized attribute");
915 return false;
916 }
917 JVM_END
918
919
920 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
921 switch (att) {
922 case JMM_GC_TIME_MS:
923 return mgr->gc_time_ms();
924
925 case JMM_GC_COUNT:
926 return mgr->gc_count();
927
928 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
929 // current implementation only has 1 ext attribute
930 return 1;
931
932 default:
933 assert(0, "Unrecognized GC attribute");
934 return -1;
935 }
936 }
937
938 class VmThreadCountClosure: public ThreadClosure {
939 private:
940 int _count;
941 public:
942 VmThreadCountClosure() : _count(0) {};
943 void do_thread(Thread* thread);
944 int count() { return _count; }
945 };
946
947 void VmThreadCountClosure::do_thread(Thread* thread) {
948 // exclude externally visible JavaThreads
949 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
950 return;
951 }
952
953 _count++;
954 }
955
956 static jint get_vm_thread_count() {
957 VmThreadCountClosure vmtcc;
958 {
959 MutexLockerEx ml(Threads_lock);
960 Threads::threads_do(&vmtcc);
961 }
962
963 return vmtcc.count();
964 }
965
966 static jint get_num_flags() {
967 // last flag entry is always NULL, so subtract 1
968 int nFlags = (int) Flag::numFlags - 1;
969 int count = 0;
970 for (int i = 0; i < nFlags; i++) {
971 Flag* flag = &Flag::flags[i];
972 // Exclude the locked (diagnostic, experimental) flags
973 if (flag->is_unlocked() || flag->is_unlocker()) {
974 count++;
975 }
976 }
977 return count;
978 }
979
980 static jlong get_long_attribute(jmmLongAttribute att) {
981 switch (att) {
982 case JMM_CLASS_LOADED_COUNT:
983 return ClassLoadingService::loaded_class_count();
984
985 case JMM_CLASS_UNLOADED_COUNT:
986 return ClassLoadingService::unloaded_class_count();
987
988 case JMM_THREAD_TOTAL_COUNT:
989 return ThreadService::get_total_thread_count();
990
991 case JMM_THREAD_LIVE_COUNT:
992 return ThreadService::get_live_thread_count();
993
994 case JMM_THREAD_PEAK_COUNT:
995 return ThreadService::get_peak_thread_count();
996
997 case JMM_THREAD_DAEMON_COUNT:
998 return ThreadService::get_daemon_thread_count();
999
1000 case JMM_JVM_INIT_DONE_TIME_MS:
1001 return Management::vm_init_done_time();
1002
1003 case JMM_COMPILE_TOTAL_TIME_MS:
1004 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
1005
1006 case JMM_OS_PROCESS_ID:
1007 return os::current_process_id();
1008
1009 // Hotspot-specific counters
1010 case JMM_CLASS_LOADED_BYTES:
1011 return ClassLoadingService::loaded_class_bytes();
1012
1013 case JMM_CLASS_UNLOADED_BYTES:
1014 return ClassLoadingService::unloaded_class_bytes();
1015
1016 case JMM_SHARED_CLASS_LOADED_COUNT:
1017 return ClassLoadingService::loaded_shared_class_count();
1018
1019 case JMM_SHARED_CLASS_UNLOADED_COUNT:
1020 return ClassLoadingService::unloaded_shared_class_count();
1021
1022
1023 case JMM_SHARED_CLASS_LOADED_BYTES:
1024 return ClassLoadingService::loaded_shared_class_bytes();
1025
1026 case JMM_SHARED_CLASS_UNLOADED_BYTES:
1027 return ClassLoadingService::unloaded_shared_class_bytes();
1028
1029 case JMM_TOTAL_CLASSLOAD_TIME_MS:
1030 return ClassLoader::classloader_time_ms();
1031
1032 case JMM_VM_GLOBAL_COUNT:
1033 return get_num_flags();
1034
1035 case JMM_SAFEPOINT_COUNT:
1036 return RuntimeService::safepoint_count();
1037
1038 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
1039 return RuntimeService::safepoint_sync_time_ms();
1040
1041 case JMM_TOTAL_STOPPED_TIME_MS:
1042 return RuntimeService::safepoint_time_ms();
1043
1044 case JMM_TOTAL_APP_TIME_MS:
1045 return RuntimeService::application_time_ms();
1046
1047 case JMM_VM_THREAD_COUNT:
1048 return get_vm_thread_count();
1049
1050 case JMM_CLASS_INIT_TOTAL_COUNT:
1051 return ClassLoader::class_init_count();
1052
1053 case JMM_CLASS_INIT_TOTAL_TIME_MS:
1054 return ClassLoader::class_init_time_ms();
1055
1056 case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
1057 return ClassLoader::class_verify_time_ms();
1058
1059 case JMM_METHOD_DATA_SIZE_BYTES:
1060 return ClassLoadingService::class_method_data_size();
1061
1062 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
1063 return os::physical_memory();
1064
1065 default:
1066 return -1;
1067 }
1068 }
1069
1070
1071 // Returns the long value of a given attribute.
1072 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
1073 if (obj == NULL) {
1074 return get_long_attribute(att);
1075 } else {
1076 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
1077 if (mgr != NULL) {
1078 return get_gc_attribute(mgr, att);
1079 }
1080 }
1081 return -1;
1082 JVM_END
1083
1084 // Gets the value of all attributes specified in the given array
1085 // and sets the value in the result array.
1086 // Returns the number of attributes found.
1087 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
1088 jobject obj,
1089 jmmLongAttribute* atts,
1090 jint count,
1091 jlong* result))
1092
1093 int num_atts = 0;
1094 if (obj == NULL) {
1095 for (int i = 0; i < count; i++) {
1096 result[i] = get_long_attribute(atts[i]);
1097 if (result[i] != -1) {
1098 num_atts++;
1099 }
1100 }
1101 } else {
1102 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
1103 for (int i = 0; i < count; i++) {
1104 result[i] = get_gc_attribute(mgr, atts[i]);
1105 if (result[i] != -1) {
1106 num_atts++;
1107 }
1108 }
1109 }
1110 return num_atts;
1111 JVM_END
1112
1113 // Helper function to do thread dump for a specific list of threads
1114 static void do_thread_dump(ThreadDumpResult* dump_result,
1115 typeArrayHandle ids_ah, // array of thread ID (long[])
1116 int num_threads,
1117 int max_depth,
1118 bool with_locked_monitors,
1119 bool with_locked_synchronizers,
1120 TRAPS) {
1121
1122 // First get an array of threadObj handles.
1123 // A JavaThread may terminate before we get the stack trace.
1124 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1125 {
1126 MutexLockerEx ml(Threads_lock);
1127 for (int i = 0; i < num_threads; i++) {
1128 jlong tid = ids_ah->long_at(i);
1129 JavaThread* jt = find_java_thread_from_id(tid);
1130 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1131 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1132 thread_handle_array->append(threadObj_h);
1133 }
1134 }
1135
1136 // Obtain thread dumps and thread snapshot information
1137 VM_ThreadDump op(dump_result,
1138 thread_handle_array,
1139 num_threads,
1140 max_depth, /* stack depth */
1141 with_locked_monitors,
1142 with_locked_synchronizers);
1143 VMThread::execute(&op);
1144 }
1145
1146 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1147 // for the thread ID specified in the corresponding entry in
1148 // the given array of thread IDs; or NULL if the thread does not exist
1149 // or has terminated.
1150 //
1151 // Input parameters:
1152 // ids - array of thread IDs
1153 // maxDepth - the maximum depth of stack traces to be dumped:
1154 // maxDepth == -1 requests to dump entire stack trace.
1155 // maxDepth == 0 requests no stack trace.
1156 // infoArray - array of ThreadInfo objects
1157 //
1158 // QQQ - Why does this method return a value instead of void?
1159 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1160 // Check if threads is null
1161 if (ids == NULL || infoArray == NULL) {
1162 THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1163 }
1164
1165 if (maxDepth < -1) {
1166 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1167 "Invalid maxDepth", -1);
1168 }
1169
1170 ResourceMark rm(THREAD);
1171 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1172 typeArrayHandle ids_ah(THREAD, ta);
1173
1174 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1175 objArrayOop oa = objArrayOop(infoArray_obj);
1176 objArrayHandle infoArray_h(THREAD, oa);
1177
1178 // validate the thread id array
1179 validate_thread_id_array(ids_ah, CHECK_0);
1180
1181 // validate the ThreadInfo[] parameters
1182 validate_thread_info_array(infoArray_h, CHECK_0);
1183
1184 // infoArray must be of the same length as the given array of thread IDs
1185 int num_threads = ids_ah->length();
1186 if (num_threads != infoArray_h->length()) {
1187 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1188 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1189 }
1190
1191 if (JDK_Version::is_gte_jdk16x_version()) {
1192 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1193 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1194 }
1195
1196 // Must use ThreadDumpResult to store the ThreadSnapshot.
1197 // GC may occur after the thread snapshots are taken but before
1198 // this function returns. The threadObj and other oops kept
1199 // in the ThreadSnapshot are marked and adjusted during GC.
1200 ThreadDumpResult dump_result(num_threads);
1201
1202 if (maxDepth == 0) {
1203 // no stack trace dumped - do not need to stop the world
1204 {
1205 MutexLockerEx ml(Threads_lock);
1206 for (int i = 0; i < num_threads; i++) {
1207 jlong tid = ids_ah->long_at(i);
1208 JavaThread* jt = find_java_thread_from_id(tid);
1209 ThreadSnapshot* ts;
1210 if (jt == NULL) {
1211 // if the thread does not exist or now it is terminated,
1212 // create dummy snapshot
1213 ts = new ThreadSnapshot();
1214 } else {
1215 ts = new ThreadSnapshot(jt);
1216 }
1217 dump_result.add_thread_snapshot(ts);
1218 }
1219 }
1220 } else {
1221 // obtain thread dump with the specific list of threads with stack trace
1222 do_thread_dump(&dump_result,
1223 ids_ah,
1224 num_threads,
1225 maxDepth,
1226 false, /* no locked monitor */
1227 false, /* no locked synchronizers */
1228 CHECK_0);
1229 }
1230
1231 int num_snapshots = dump_result.num_snapshots();
1232 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1233 int index = 0;
1234 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1235 // For each thread, create an java/lang/management/ThreadInfo object
1236 // and fill with the thread information
1237
1238 if (ts->threadObj() == NULL) {
1239 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1240 infoArray_h->obj_at_put(index, NULL);
1241 continue;
1242 }
1243
1244 // Create java.lang.management.ThreadInfo object
1245 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1246 infoArray_h->obj_at_put(index, info_obj);
1247 }
1248 return 0;
1249 JVM_END
1250
1251 // Dump thread info for the specified threads.
1252 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1253 // for the thread ID specified in the corresponding entry in
1254 // the given array of thread IDs; or NULL if the thread does not exist
1255 // or has terminated.
1256 //
1257 // Input parameter:
1258 // ids - array of thread IDs; NULL indicates all live threads
1259 // locked_monitors - if true, dump locked object monitors
1260 // locked_synchronizers - if true, dump locked JSR-166 synchronizers
1261 //
1262 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers))
1263 ResourceMark rm(THREAD);
1264
1265 if (JDK_Version::is_gte_jdk16x_version()) {
1266 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1267 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1268 }
1269
1270 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1271 int num_threads = (ta != NULL ? ta->length() : 0);
1272 typeArrayHandle ids_ah(THREAD, ta);
1273
1274 ThreadDumpResult dump_result(num_threads); // can safepoint
1275
1276 if (ids_ah() != NULL) {
1277
1278 // validate the thread id array
1279 validate_thread_id_array(ids_ah, CHECK_NULL);
1280
1281 // obtain thread dump of a specific list of threads
1282 do_thread_dump(&dump_result,
1283 ids_ah,
1284 num_threads,
1285 -1, /* entire stack */
1286 (locked_monitors ? true : false), /* with locked monitors */
1287 (locked_synchronizers ? true : false), /* with locked synchronizers */
1288 CHECK_NULL);
1289 } else {
1290 // obtain thread dump of all threads
1291 VM_ThreadDump op(&dump_result,
1292 -1, /* entire stack */
1293 (locked_monitors ? true : false), /* with locked monitors */
1294 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1295 VMThread::execute(&op);
1296 }
1297
1298 int num_snapshots = dump_result.num_snapshots();
1299
1300 // create the result ThreadInfo[] object
1301 Klass* k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1302 instanceKlassHandle ik (THREAD, k);
1303 objArrayOop r = oopFactory::new_objArray(ik(), num_snapshots, CHECK_NULL);
1304 objArrayHandle result_h(THREAD, r);
1305
1306 int index = 0;
1307 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1308 if (ts->threadObj() == NULL) {
1309 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1310 result_h->obj_at_put(index, NULL);
1311 continue;
1312 }
1313
1314 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1315 assert(stacktrace != NULL, "Must have a stack trace dumped");
1316
1317 // Create Object[] filled with locked monitors
1318 // Create int[] filled with the stack depth where a monitor was locked
1319 int num_frames = stacktrace->get_stack_depth();
1320 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1321
1322 // Count the total number of locked monitors
1323 for (int i = 0; i < num_frames; i++) {
1324 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1325 num_locked_monitors += frame->num_locked_monitors();
1326 }
1327
1328 objArrayHandle monitors_array;
1329 typeArrayHandle depths_array;
1330 objArrayHandle synchronizers_array;
1331
1332 if (locked_monitors) {
1333 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1334 // where the thread locked it
1335 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_monitors, CHECK_NULL);
1336 objArrayHandle mh(THREAD, array);
1337 monitors_array = mh;
1338
1339 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1340 typeArrayHandle dh(THREAD, tarray);
1341 depths_array = dh;
1342
1343 int count = 0;
1344 int j = 0;
1345 for (int depth = 0; depth < num_frames; depth++) {
1346 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1347 int len = frame->num_locked_monitors();
1348 GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1349 for (j = 0; j < len; j++) {
1350 oop monitor = locked_monitors->at(j);
1351 assert(monitor != NULL && monitor->is_instance(), "must be a Java object");
1352 monitors_array->obj_at_put(count, monitor);
1353 depths_array->int_at_put(count, depth);
1354 count++;
1355 }
1356 }
1357
1358 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1359 for (j = 0; j < jni_locked_monitors->length(); j++) {
1360 oop object = jni_locked_monitors->at(j);
1361 assert(object != NULL && object->is_instance(), "must be a Java object");
1362 monitors_array->obj_at_put(count, object);
1363 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1364 depths_array->int_at_put(count, -1);
1365 count++;
1366 }
1367 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1368 }
1369
1370 if (locked_synchronizers) {
1371 // Create Object[] filled with locked JSR-166 synchronizers
1372 assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1373 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1374 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1375 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1376
1377 objArrayOop array = oopFactory::new_objArray(SystemDictionary::Object_klass(), num_locked_synchronizers, CHECK_NULL);
1378 objArrayHandle sh(THREAD, array);
1379 synchronizers_array = sh;
1380
1381 for (int k = 0; k < num_locked_synchronizers; k++) {
1382 synchronizers_array->obj_at_put(k, locks->at(k));
1383 }
1384 }
1385
1386 // Create java.lang.management.ThreadInfo object
1387 instanceOop info_obj = Management::create_thread_info_instance(ts,
1388 monitors_array,
1389 depths_array,
1390 synchronizers_array,
1391 CHECK_NULL);
1392 result_h->obj_at_put(index, info_obj);
1393 }
1394
1395 return (jobjectArray) JNIHandles::make_local(env, result_h());
1396 JVM_END
1397
1398 // Returns an array of Class objects.
1399 JVM_ENTRY(jobjectArray, jmm_GetLoadedClasses(JNIEnv *env))
1400 ResourceMark rm(THREAD);
1401
1402 LoadedClassesEnumerator lce(THREAD); // Pass current Thread as parameter
1403
1404 int num_classes = lce.num_loaded_classes();
1405 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), num_classes, CHECK_0);
1406 objArrayHandle classes_ah(THREAD, r);
1407
1408 for (int i = 0; i < num_classes; i++) {
1409 KlassHandle kh = lce.get_klass(i);
1410 oop mirror = Klass::cast(kh())->java_mirror();
1411 classes_ah->obj_at_put(i, mirror);
1412 }
1413
1414 return (jobjectArray) JNIHandles::make_local(env, classes_ah());
1415 JVM_END
1416
1417 // Reset statistic. Return true if the requested statistic is reset.
1418 // Otherwise, return false.
1419 //
1420 // Input parameters:
1421 // obj - specify which instance the statistic associated with to be reset
1422 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1423 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1424 // type - the type of statistic to be reset
1425 //
1426 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1427 ResourceMark rm(THREAD);
1428
1429 switch (type) {
1430 case JMM_STAT_PEAK_THREAD_COUNT:
1431 ThreadService::reset_peak_thread_count();
1432 return true;
1433
1434 case JMM_STAT_THREAD_CONTENTION_COUNT:
1435 case JMM_STAT_THREAD_CONTENTION_TIME: {
1436 jlong tid = obj.j;
1437 if (tid < 0) {
1438 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1439 }
1440
1441 // Look for the JavaThread of this given tid
1442 MutexLockerEx ml(Threads_lock);
1443 if (tid == 0) {
1444 // reset contention statistics for all threads if tid == 0
1445 for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) {
1446 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1447 ThreadService::reset_contention_count_stat(java_thread);
1448 } else {
1449 ThreadService::reset_contention_time_stat(java_thread);
1450 }
1451 }
1452 } else {
1453 // reset contention statistics for a given thread
1454 JavaThread* java_thread = find_java_thread_from_id(tid);
1455 if (java_thread == NULL) {
1456 return false;
1457 }
1458
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 return true;
1466 break;
1467 }
1468 case JMM_STAT_PEAK_POOL_USAGE: {
1469 jobject o = obj.l;
1470 if (o == NULL) {
1471 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1472 }
1473
1474 oop pool_obj = JNIHandles::resolve(o);
1475 assert(pool_obj->is_instance(), "Should be an instanceOop");
1476 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1477
1478 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1479 if (pool != NULL) {
1480 pool->reset_peak_memory_usage();
1481 return true;
1482 }
1483 break;
1484 }
1485 case JMM_STAT_GC_STAT: {
1486 jobject o = obj.l;
1487 if (o == NULL) {
1488 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1489 }
1490
1491 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1492 if (mgr != NULL) {
1493 mgr->reset_gc_stat();
1494 return true;
1495 }
1496 break;
1497 }
1498 default:
1499 assert(0, "Unknown Statistic Type");
1500 }
1501 return false;
1502 JVM_END
1503
1504 // Returns the fast estimate of CPU time consumed by
1505 // a given thread (in nanoseconds).
1506 // If thread_id == 0, return CPU time for the current thread.
1507 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1508 if (!os::is_thread_cpu_time_supported()) {
1509 return -1;
1510 }
1511
1512 if (thread_id < 0) {
1513 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1514 "Invalid thread ID", -1);
1515 }
1516
1517 JavaThread* java_thread = NULL;
1518 if (thread_id == 0) {
1519 // current thread
1520 return os::current_thread_cpu_time();
1521 } else {
1522 MutexLockerEx ml(Threads_lock);
1523 java_thread = find_java_thread_from_id(thread_id);
1524 if (java_thread != NULL) {
1525 return os::thread_cpu_time((Thread*) java_thread);
1526 }
1527 }
1528 return -1;
1529 JVM_END
1530
1531 // Returns the CPU time consumed by a given thread (in nanoseconds).
1532 // If thread_id == 0, CPU time for the current thread is returned.
1533 // If user_sys_cpu_time = true, user level and system CPU time of
1534 // a given thread is returned; otherwise, only user level CPU time
1535 // is returned.
1536 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
1537 if (!os::is_thread_cpu_time_supported()) {
1538 return -1;
1539 }
1540
1541 if (thread_id < 0) {
1542 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1543 "Invalid thread ID", -1);
1544 }
1545
1546 JavaThread* java_thread = NULL;
1547 if (thread_id == 0) {
1548 // current thread
1549 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
1550 } else {
1551 MutexLockerEx ml(Threads_lock);
1552 java_thread = find_java_thread_from_id(thread_id);
1553 if (java_thread != NULL) {
1554 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
1555 }
1556 }
1557 return -1;
1558 JVM_END
1559
1560 // Gets an array containing the CPU times consumed by a set of threads
1561 // (in nanoseconds). Each element of the array is the CPU time for the
1562 // thread ID specified in the corresponding entry in the given array
1563 // of thread IDs; or -1 if the thread does not exist or has terminated.
1564 // If user_sys_cpu_time = true, the sum of user level and system CPU time
1565 // for the given thread is returned; otherwise, only user level CPU time
1566 // is returned.
1567 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
1568 jlongArray timeArray,
1569 jboolean user_sys_cpu_time))
1570 // Check if threads is null
1571 if (ids == NULL || timeArray == NULL) {
1572 THROW(vmSymbols::java_lang_NullPointerException());
1573 }
1574
1575 ResourceMark rm(THREAD);
1576 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1577 typeArrayHandle ids_ah(THREAD, ta);
1578
1579 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
1580 typeArrayHandle timeArray_h(THREAD, tia);
1581
1582 // validate the thread id array
1583 validate_thread_id_array(ids_ah, CHECK);
1584
1585 // timeArray must be of the same length as the given array of thread IDs
1586 int num_threads = ids_ah->length();
1587 if (num_threads != timeArray_h->length()) {
1588 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1589 "The length of the given long array does not match the length of "
1590 "the given array of thread IDs");
1591 }
1592
1593 MutexLockerEx ml(Threads_lock);
1594 for (int i = 0; i < num_threads; i++) {
1595 JavaThread* java_thread = find_java_thread_from_id(ids_ah->long_at(i));
1596 if (java_thread != NULL) {
1597 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
1598 user_sys_cpu_time != 0));
1599 }
1600 }
1601 JVM_END
1602
1603 // Returns a String array of all VM global flag names
1604 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1605 // last flag entry is always NULL, so subtract 1
1606 int nFlags = (int) Flag::numFlags - 1;
1607 // allocate a temp array
1608 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1609 nFlags, CHECK_0);
1610 objArrayHandle flags_ah(THREAD, r);
1611 int num_entries = 0;
1612 for (int i = 0; i < nFlags; i++) {
1613 Flag* flag = &Flag::flags[i];
1614 // Exclude the locked (experimental, diagnostic) flags
1615 if (flag->is_unlocked() || flag->is_unlocker()) {
1616 Handle s = java_lang_String::create_from_str(flag->name, CHECK_0);
1617 flags_ah->obj_at_put(num_entries, s());
1618 num_entries++;
1619 }
1620 }
1621
1622 if (num_entries < nFlags) {
1623 // Return array of right length
1624 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1625 for(int i = 0; i < num_entries; i++) {
1626 res->obj_at_put(i, flags_ah->obj_at(i));
1627 }
1628 return (jobjectArray)JNIHandles::make_local(env, res);
1629 }
1630
1631 return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1632 JVM_END
1633
1634 // Utility function used by jmm_GetVMGlobals. Returns false if flag type
1635 // can't be determined, true otherwise. If false is returned, then *global
1636 // will be incomplete and invalid.
1637 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
1638 Handle flag_name;
1639 if (name() == NULL) {
1640 flag_name = java_lang_String::create_from_str(flag->name, CHECK_false);
1641 } else {
1642 flag_name = name;
1643 }
1644 global->name = (jstring)JNIHandles::make_local(env, flag_name());
1645
1646 if (flag->is_bool()) {
1647 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1648 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1649 } else if (flag->is_intx()) {
1650 global->value.j = (jlong)flag->get_intx();
1651 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1652 } else if (flag->is_uintx()) {
1653 global->value.j = (jlong)flag->get_uintx();
1654 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1655 } else if (flag->is_uint64_t()) {
1656 global->value.j = (jlong)flag->get_uint64_t();
1657 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1658 } else if (flag->is_ccstr()) {
1659 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1660 global->value.l = (jobject)JNIHandles::make_local(env, str());
1661 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1662 } else {
1663 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1664 return false;
1665 }
1666
1667 global->writeable = flag->is_writeable();
1668 global->external = flag->is_external();
1669 switch (flag->origin) {
1670 case DEFAULT:
1671 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1672 break;
1673 case COMMAND_LINE:
1674 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1675 break;
1676 case ENVIRON_VAR:
1677 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1678 break;
1679 case CONFIG_FILE:
1680 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1681 break;
1682 case MANAGEMENT:
1683 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1684 break;
1685 case ERGONOMIC:
1686 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1687 break;
1688 default:
1689 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1690 }
1691
1692 return true;
1693 }
1694
1695 // Fill globals array of count length with jmmVMGlobal entries
1696 // specified by names. If names == NULL, fill globals array
1697 // with all Flags. Return value is number of entries
1698 // created in globals.
1699 // If a Flag with a given name in an array element does not
1700 // exist, globals[i].name will be set to NULL.
1701 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1702 jobjectArray names,
1703 jmmVMGlobal *globals,
1704 jint count))
1705
1706
1707 if (globals == NULL) {
1708 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1709 }
1710
1711 ResourceMark rm(THREAD);
1712
1713 if (names != NULL) {
1714 // return the requested globals
1715 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1716 objArrayHandle names_ah(THREAD, ta);
1717 // Make sure we have a String array
1718 Klass* element_klass = objArrayKlass::cast(names_ah->klass())->element_klass();
1719 if (element_klass != SystemDictionary::String_klass()) {
1720 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1721 "Array element type is not String class", 0);
1722 }
1723
1724 int names_length = names_ah->length();
1725 int num_entries = 0;
1726 for (int i = 0; i < names_length && i < count; i++) {
1727 oop s = names_ah->obj_at(i);
1728 if (s == NULL) {
1729 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1730 }
1731
1732 Handle sh(THREAD, s);
1733 char* str = java_lang_String::as_utf8_string(s);
1734 Flag* flag = Flag::find_flag(str, strlen(str));
1735 if (flag != NULL &&
1736 add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1737 num_entries++;
1738 } else {
1739 globals[i].name = NULL;
1740 }
1741 }
1742 return num_entries;
1743 } else {
1744 // return all globals if names == NULL
1745
1746 // last flag entry is always NULL, so subtract 1
1747 int nFlags = (int) Flag::numFlags - 1;
1748 Handle null_h;
1749 int num_entries = 0;
1750 for (int i = 0; i < nFlags && num_entries < count; i++) {
1751 Flag* flag = &Flag::flags[i];
1752 // Exclude the locked (diagnostic, experimental) flags
1753 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1754 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1755 num_entries++;
1756 }
1757 }
1758 return num_entries;
1759 }
1760 JVM_END
1761
1762 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1763 ResourceMark rm(THREAD);
1764
1765 oop fn = JNIHandles::resolve_external_guard(flag_name);
1766 if (fn == NULL) {
1767 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1768 "The flag name cannot be null.");
1769 }
1770 char* name = java_lang_String::as_utf8_string(fn);
1771 Flag* flag = Flag::find_flag(name, strlen(name));
1772 if (flag == NULL) {
1773 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1774 "Flag does not exist.");
1775 }
1776 if (!flag->is_writeable()) {
1777 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1778 "This flag is not writeable.");
1779 }
1780
1781 bool succeed;
1782 if (flag->is_bool()) {
1783 bool bvalue = (new_value.z == JNI_TRUE ? true : false);
1784 succeed = CommandLineFlags::boolAtPut(name, &bvalue, MANAGEMENT);
1785 } else if (flag->is_intx()) {
1786 intx ivalue = (intx)new_value.j;
1787 succeed = CommandLineFlags::intxAtPut(name, &ivalue, MANAGEMENT);
1788 } else if (flag->is_uintx()) {
1789 uintx uvalue = (uintx)new_value.j;
1790 succeed = CommandLineFlags::uintxAtPut(name, &uvalue, MANAGEMENT);
1791 } else if (flag->is_uint64_t()) {
1792 uint64_t uvalue = (uint64_t)new_value.j;
1793 succeed = CommandLineFlags::uint64_tAtPut(name, &uvalue, MANAGEMENT);
1794 } else if (flag->is_ccstr()) {
1795 oop str = JNIHandles::resolve_external_guard(new_value.l);
1796 if (str == NULL) {
1797 THROW(vmSymbols::java_lang_NullPointerException());
1798 }
1799 ccstr svalue = java_lang_String::as_utf8_string(str);
1800 succeed = CommandLineFlags::ccstrAtPut(name, &svalue, MANAGEMENT);
1801 }
1802 assert(succeed, "Setting flag should succeed");
1803 JVM_END
1804
1805 class ThreadTimesClosure: public ThreadClosure {
1806 private:
1807 objArrayOop _names;
1808 typeArrayOop _times;
1809 int _names_len;
1810 int _times_len;
1811 int _count;
1812
1813 public:
1814 ThreadTimesClosure(objArrayOop names, typeArrayOop times);
1815 virtual void do_thread(Thread* thread);
1816 int count() { return _count; }
1817 };
1818
1819 ThreadTimesClosure::ThreadTimesClosure(objArrayOop names,
1820 typeArrayOop times) {
1821 assert(names != NULL, "names was NULL");
1822 assert(times != NULL, "times was NULL");
1823 _names = names;
1824 _names_len = names->length();
1825 _times = times;
1826 _times_len = times->length();
1827 _count = 0;
1828 }
1829
1830 void ThreadTimesClosure::do_thread(Thread* thread) {
1831 Handle s;
1832 assert(thread != NULL, "thread was NULL");
1833
1834 // exclude externally visible JavaThreads
1835 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1836 return;
1837 }
1838
1839 if (_count >= _names_len || _count >= _times_len) {
1840 // skip if the result array is not big enough
1841 return;
1842 }
1843
1844 EXCEPTION_MARK;
1845
1846 assert(thread->name() != NULL, "All threads should have a name");
1847 s = java_lang_String::create_from_str(thread->name(), CHECK);
1848 _names->obj_at_put(_count, s());
1849
1850 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1851 os::thread_cpu_time(thread) : -1);
1852 _count++;
1853 }
1854
1855 // Fills names with VM internal thread names and times with the corresponding
1856 // CPU times. If names or times is NULL, a NullPointerException is thrown.
1857 // If the element type of names is not String, an IllegalArgumentException is
1858 // thrown.
1859 // If an array is not large enough to hold all the entries, only the entries
1860 // that fit will be returned. Return value is the number of VM internal
1861 // threads entries.
1862 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1863 jobjectArray names,
1864 jlongArray times))
1865 if (names == NULL || times == NULL) {
1866 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1867 }
1868 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1869 objArrayHandle names_ah(THREAD, na);
1870
1871 // Make sure we have a String array
1872 Klass* element_klass = objArrayKlass::cast(names_ah->klass())->element_klass();
1873 if (element_klass != SystemDictionary::String_klass()) {
1874 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1875 "Array element type is not String class", 0);
1876 }
1877
1878 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1879 typeArrayHandle times_ah(THREAD, ta);
1880
1881 ThreadTimesClosure ttc(names_ah(), times_ah());
1882 {
1883 MutexLockerEx ml(Threads_lock);
1884 Threads::threads_do(&ttc);
1885 }
1886
1887 return ttc.count();
1888 JVM_END
1889
1890 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1891 ResourceMark rm(THREAD);
1892
1893 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1894 VMThread::execute(&op);
1895
1896 DeadlockCycle* deadlocks = op.result();
1897 if (deadlocks == NULL) {
1898 // no deadlock found and return
1899 return Handle();
1900 }
1901
1902 int num_threads = 0;
1903 DeadlockCycle* cycle;
1904 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1905 num_threads += cycle->num_threads();
1906 }
1907
1908 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1909 objArrayHandle threads_ah(THREAD, r);
1910
1911 int index = 0;
1912 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1913 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1914 int len = deadlock_threads->length();
1915 for (int i = 0; i < len; i++) {
1916 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1917 index++;
1918 }
1919 }
1920 return threads_ah;
1921 }
1922
1923 // Finds cycles of threads that are deadlocked involved in object monitors
1924 // and JSR-166 synchronizers.
1925 // Returns an array of Thread objects which are in deadlock, if any.
1926 // Otherwise, returns NULL.
1927 //
1928 // Input parameter:
1929 // object_monitors_only - if true, only check object monitors
1930 //
1931 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1932 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1933 return (jobjectArray) JNIHandles::make_local(env, result());
1934 JVM_END
1935
1936 // Finds cycles of threads that are deadlocked on monitor locks
1937 // Returns an array of Thread objects which are in deadlock, if any.
1938 // Otherwise, returns NULL.
1939 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1940 Handle result = find_deadlocks(true, CHECK_0);
1941 return (jobjectArray) JNIHandles::make_local(env, result());
1942 JVM_END
1943
1944 // Gets the information about GC extension attributes including
1945 // the name of the attribute, its type, and a short description.
1946 //
1947 // Input parameters:
1948 // mgr - GC memory manager
1949 // info - caller allocated array of jmmExtAttributeInfo
1950 // count - number of elements of the info array
1951 //
1952 // Returns the number of GC extension attributes filled in the info array; or
1953 // -1 if info is not big enough
1954 //
1955 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1956 // All GC memory managers have 1 attribute (number of GC threads)
1957 if (count == 0) {
1958 return 0;
1959 }
1960
1961 if (info == NULL) {
1962 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1963 }
1964
1965 info[0].name = "GcThreadCount";
1966 info[0].type = 'I';
1967 info[0].description = "Number of GC threads";
1968 return 1;
1969 JVM_END
1970
1971 // verify the given array is an array of java/lang/management/MemoryUsage objects
1972 // of a given length and return the objArrayOop
1973 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1974 if (array == NULL) {
1975 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1976 }
1977
1978 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1979 objArrayHandle array_h(THREAD, oa);
1980
1981 // array must be of the given length
1982 if (length != array_h->length()) {
1983 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1984 "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1985 }
1986
1987 // check if the element of array is of type MemoryUsage class
1988 Klass* usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1989 Klass* element_klass = objArrayKlass::cast(array_h->klass())->element_klass();
1990 if (element_klass != usage_klass) {
1991 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1992 "The element type is not MemoryUsage class", 0);
1993 }
1994
1995 return array_h();
1996 }
1997
1998 // Gets the statistics of the last GC of a given GC memory manager.
1999 // Input parameters:
2000 // obj - GarbageCollectorMXBean object
2001 // gc_stat - caller allocated jmmGCStat where:
2002 // a. before_gc_usage - array of MemoryUsage objects
2003 // b. after_gc_usage - array of MemoryUsage objects
2004 // c. gc_ext_attributes_values_size is set to the
2005 // gc_ext_attribute_values array allocated
2006 // d. gc_ext_attribute_values is a caller allocated array of jvalue.
2007 //
2008 // On return,
2009 // gc_index == 0 indicates no GC statistics available
2010 //
2011 // before_gc_usage and after_gc_usage - filled with per memory pool
2012 // before and after GC usage in the same order as the memory pools
2013 // returned by GetMemoryPools for a given GC memory manager.
2014 // num_gc_ext_attributes indicates the number of elements in
2015 // the gc_ext_attribute_values array is filled; or
2016 // -1 if the gc_ext_attributes_values array is not big enough
2017 //
2018 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
2019 ResourceMark rm(THREAD);
2020
2021 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
2022 THROW(vmSymbols::java_lang_NullPointerException());
2023 }
2024
2025 // Get the GCMemoryManager
2026 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
2027
2028 // Make a copy of the last GC statistics
2029 // GC may occur while constructing the last GC information
2030 int num_pools = MemoryService::num_memory_pools();
2031 GCStatInfo stat(num_pools);
2032 if (mgr->get_last_gc_stat(&stat) == 0) {
2033 gc_stat->gc_index = 0;
2034 return;
2035 }
2036
2037 gc_stat->gc_index = stat.gc_index();
2038 gc_stat->start_time = Management::ticks_to_ms(stat.start_time());
2039 gc_stat->end_time = Management::ticks_to_ms(stat.end_time());
2040
2041 // Current implementation does not have GC extension attributes
2042 gc_stat->num_gc_ext_attributes = 0;
2043
2044 // Fill the arrays of MemoryUsage objects with before and after GC
2045 // per pool memory usage
2046 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
2047 num_pools,
2048 CHECK);
2049 objArrayHandle usage_before_gc_ah(THREAD, bu);
2050
2051 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
2052 num_pools,
2053 CHECK);
2054 objArrayHandle usage_after_gc_ah(THREAD, au);
2055
2056 for (int i = 0; i < num_pools; i++) {
2057 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat.before_gc_usage_for_pool(i), CHECK);
2058 Handle after_usage;
2059
2060 MemoryUsage u = stat.after_gc_usage_for_pool(i);
2061 if (u.max_size() == 0 && u.used() > 0) {
2062 // If max size == 0, this pool is a survivor space.
2063 // Set max size = -1 since the pools will be swapped after GC.
2064 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
2065 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
2066 } else {
2067 after_usage = MemoryService::create_MemoryUsage_obj(stat.after_gc_usage_for_pool(i), CHECK);
2068 }
2069 usage_before_gc_ah->obj_at_put(i, before_usage());
2070 usage_after_gc_ah->obj_at_put(i, after_usage());
2071 }
2072
2073 if (gc_stat->gc_ext_attribute_values_size > 0) {
2074 // Current implementation only has 1 attribute (number of GC threads)
2075 // The type is 'I'
2076 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
2077 }
2078 JVM_END
2079
2080 JVM_ENTRY(void, jmm_SetGCNotificationEnabled(JNIEnv *env, jobject obj, jboolean enabled))
2081 ResourceMark rm(THREAD);
2082 // Get the GCMemoryManager
2083 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
2084 mgr->set_notification_enabled(enabled?true:false);
2085 JVM_END
2086
2087 // Dump heap - Returns 0 if succeeds.
2088 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
2089 #ifndef SERVICES_KERNEL
2090 ResourceMark rm(THREAD);
2091 oop on = JNIHandles::resolve_external_guard(outputfile);
2092 if (on == NULL) {
2093 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
2094 "Output file name cannot be null.", -1);
2095 }
2096 char* name = java_lang_String::as_utf8_string(on);
2097 if (name == NULL) {
2098 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
2099 "Output file name cannot be null.", -1);
2100 }
2101 HeapDumper dumper(live ? true : false);
2102 if (dumper.dump(name) != 0) {
2103 const char* errmsg = dumper.error_as_C_string();
2104 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
2105 }
2106 return 0;
2107 #else // SERVICES_KERNEL
2108 return -1;
2109 #endif // SERVICES_KERNEL
2110 JVM_END
2111
2112 JVM_ENTRY(jobjectArray, jmm_GetDiagnosticCommands(JNIEnv *env))
2113 ResourceMark rm(THREAD);
2114 GrowableArray<const char *>* dcmd_list = DCmdFactory::DCmd_list();
2115 objArrayOop cmd_array_oop = oopFactory::new_objArray(SystemDictionary::String_klass(),
2116 dcmd_list->length(), CHECK_NULL);
2117 objArrayHandle cmd_array(THREAD, cmd_array_oop);
2118 for (int i = 0; i < dcmd_list->length(); i++) {
2119 oop cmd_name = java_lang_String::create_oop_from_str(dcmd_list->at(i), CHECK_NULL);
2120 cmd_array->obj_at_put(i, cmd_name);
2121 }
2122 return (jobjectArray) JNIHandles::make_local(env, cmd_array());
2123 JVM_END
2124
2125 JVM_ENTRY(void, jmm_GetDiagnosticCommandInfo(JNIEnv *env, jobjectArray cmds,
2126 dcmdInfo* infoArray))
2127 if (cmds == NULL || infoArray == NULL) {
2128 THROW(vmSymbols::java_lang_NullPointerException());
2129 }
2130
2131 ResourceMark rm(THREAD);
2132
2133 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(cmds));
2134 objArrayHandle cmds_ah(THREAD, ca);
2135
2136 // Make sure we have a String array
2137 Klass* element_klass = objArrayKlass::cast(cmds_ah->klass())->element_klass();
2138 if (element_klass != SystemDictionary::String_klass()) {
2139 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2140 "Array element type is not String class");
2141 }
2142
2143 GrowableArray<DCmdInfo *>* info_list = DCmdFactory::DCmdInfo_list();
2144
2145 int num_cmds = cmds_ah->length();
2146 for (int i = 0; i < num_cmds; i++) {
2147 oop cmd = cmds_ah->obj_at(i);
2148 if (cmd == NULL) {
2149 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2150 "Command name cannot be null.");
2151 }
2152 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2153 if (cmd_name == NULL) {
2154 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2155 "Command name cannot be null.");
2156 }
2157 int pos = info_list->find((void*)cmd_name,DCmdInfo::by_name);
2158 if (pos == -1) {
2159 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2160 "Unknown diagnostic command");
2161 }
2162 DCmdInfo* info = info_list->at(pos);
2163 infoArray[i].name = info->name();
2164 infoArray[i].description = info->description();
2165 infoArray[i].impact = info->impact();
2166 infoArray[i].num_arguments = info->num_arguments();
2167 infoArray[i].enabled = info->is_enabled();
2168 }
2169 JVM_END
2170
2171 JVM_ENTRY(void, jmm_GetDiagnosticCommandArgumentsInfo(JNIEnv *env,
2172 jstring command, dcmdArgInfo* infoArray))
2173 ResourceMark rm(THREAD);
2174 oop cmd = JNIHandles::resolve_external_guard(command);
2175 if (cmd == NULL) {
2176 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2177 "Command line cannot be null.");
2178 }
2179 char* cmd_name = java_lang_String::as_utf8_string(cmd);
2180 if (cmd_name == NULL) {
2181 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
2182 "Command line content cannot be null.");
2183 }
2184 DCmd* dcmd = NULL;
2185 DCmdFactory*factory = DCmdFactory::factory(cmd_name, strlen(cmd_name));
2186 if (factory != NULL) {
2187 dcmd = factory->create_resource_instance(NULL);
2188 }
2189 if (dcmd == NULL) {
2190 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
2191 "Unknown diagnostic command");
2192 }
2193 DCmdMark mark(dcmd);
2194 GrowableArray<DCmdArgumentInfo*>* array = dcmd->argument_info_array();
2195 if (array->length() == 0) {
2196 return;
2197 }
2198 for (int i = 0; i < array->length(); i++) {
2199 infoArray[i].name = array->at(i)->name();
2200 infoArray[i].description = array->at(i)->description();
2201 infoArray[i].type = array->at(i)->type();
2202 infoArray[i].default_string = array->at(i)->default_string();
2203 infoArray[i].mandatory = array->at(i)->is_mandatory();
2204 infoArray[i].option = array->at(i)->is_option();
2205 infoArray[i].position = array->at(i)->position();
2206 }
2207 return;
2208 JVM_END
2209
2210 JVM_ENTRY(jstring, jmm_ExecuteDiagnosticCommand(JNIEnv *env, jstring commandline))
2211 ResourceMark rm(THREAD);
2212 oop cmd = JNIHandles::resolve_external_guard(commandline);
2213 if (cmd == NULL) {
2214 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2215 "Command line cannot be null.");
2216 }
2217 char* cmdline = java_lang_String::as_utf8_string(cmd);
2218 if (cmdline == NULL) {
2219 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
2220 "Command line content cannot be null.");
2221 }
2222 bufferedStream output;
2223 DCmd::parse_and_execute(&output, cmdline, ' ', CHECK_NULL);
2224 oop result = java_lang_String::create_oop_from_str(output.as_string(), CHECK_NULL);
2225 return (jstring) JNIHandles::make_local(env, result);
2226 JVM_END
2227
2228 jlong Management::ticks_to_ms(jlong ticks) {
2229 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2230 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2231 * (double)1000.0);
2232 }
2233
2234 const struct jmmInterface_1_ jmm_interface = {
2235 NULL,
2236 NULL,
2237 jmm_GetVersion,
2238 jmm_GetOptionalSupport,
2239 jmm_GetInputArguments,
2240 jmm_GetThreadInfo,
2241 jmm_GetInputArgumentArray,
2242 jmm_GetMemoryPools,
2243 jmm_GetMemoryManagers,
2244 jmm_GetMemoryPoolUsage,
2245 jmm_GetPeakMemoryPoolUsage,
2246 jmm_GetThreadAllocatedMemory,
2247 jmm_GetMemoryUsage,
2248 jmm_GetLongAttribute,
2249 jmm_GetBoolAttribute,
2250 jmm_SetBoolAttribute,
2251 jmm_GetLongAttributes,
2252 jmm_FindMonitorDeadlockedThreads,
2253 jmm_GetThreadCpuTime,
2254 jmm_GetVMGlobalNames,
2255 jmm_GetVMGlobals,
2256 jmm_GetInternalThreadTimes,
2257 jmm_ResetStatistic,
2258 jmm_SetPoolSensor,
2259 jmm_SetPoolThreshold,
2260 jmm_GetPoolCollectionUsage,
2261 jmm_GetGCExtAttributeInfo,
2262 jmm_GetLastGCStat,
2263 jmm_GetThreadCpuTimeWithKind,
2264 jmm_GetThreadCpuTimesWithKind,
2265 jmm_DumpHeap0,
2266 jmm_FindDeadlockedThreads,
2267 jmm_SetVMGlobal,
2268 NULL,
2269 jmm_DumpThreads,
2270 jmm_SetGCNotificationEnabled,
2271 jmm_GetDiagnosticCommands,
2272 jmm_GetDiagnosticCommandInfo,
2273 jmm_GetDiagnosticCommandArgumentsInfo,
2274 jmm_ExecuteDiagnosticCommand
2275 };
2276
2277 void* Management::get_jmm_interface(int version) {
2278 if (version == JMM_VERSION_1_0) {
2279 return (void*) &jmm_interface;
2280 }
2281 return NULL;
2282 }