1 /*
2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "compiler/compileBroker.hpp"
28 #include "memory/iterator.hpp"
29 #include "memory/oopFactory.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "oops/klass.hpp"
32 #include "oops/klassOop.hpp"
33 #include "oops/objArrayKlass.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/handles.inline.hpp"
37 #include "runtime/interfaceSupport.hpp"
38 #include "runtime/javaCalls.hpp"
39 #include "runtime/jniHandles.hpp"
40 #include "runtime/os.hpp"
41 #include "runtime/serviceThread.hpp"
42 #include "services/classLoadingService.hpp"
43 #include "services/heapDumper.hpp"
44 #include "services/lowMemoryDetector.hpp"
45 #include "services/management.hpp"
46 #include "services/memoryManager.hpp"
47 #include "services/memoryPool.hpp"
48 #include "services/memoryService.hpp"
49 #include "services/runtimeService.hpp"
50 #include "services/threadService.hpp"
51
52 PerfVariable* Management::_begin_vm_creation_time = NULL;
53 PerfVariable* Management::_end_vm_creation_time = NULL;
54 PerfVariable* Management::_vm_init_done_time = NULL;
55
56 klassOop Management::_sensor_klass = NULL;
57 klassOop Management::_threadInfo_klass = NULL;
58 klassOop Management::_memoryUsage_klass = NULL;
59 klassOop Management::_memoryPoolMXBean_klass = NULL;
60 klassOop Management::_memoryManagerMXBean_klass = NULL;
61 klassOop Management::_garbageCollectorMXBean_klass = NULL;
62 klassOop Management::_managementFactory_klass = NULL;
63
64 jmmOptionalSupport Management::_optional_support = {0};
65 TimeStamp Management::_stamp;
66
67 void management_init() {
68 Management::init();
69 ThreadService::init();
70 RuntimeService::init();
71 ClassLoadingService::init();
72 }
73
74 void Management::init() {
75 EXCEPTION_MARK;
76
77 // These counters are for java.lang.management API support.
78 // They are created even if -XX:-UsePerfData is set and in
79 // that case, they will be allocated on C heap.
80
81 _begin_vm_creation_time =
82 PerfDataManager::create_variable(SUN_RT, "createVmBeginTime",
83 PerfData::U_None, CHECK);
84
85 _end_vm_creation_time =
86 PerfDataManager::create_variable(SUN_RT, "createVmEndTime",
87 PerfData::U_None, CHECK);
88
89 _vm_init_done_time =
90 PerfDataManager::create_variable(SUN_RT, "vmInitDoneTime",
91 PerfData::U_None, CHECK);
92
93 // Initialize optional support
94 _optional_support.isLowMemoryDetectionSupported = 1;
95 _optional_support.isCompilationTimeMonitoringSupported = 1;
96 _optional_support.isThreadContentionMonitoringSupported = 1;
97
98 if (os::is_thread_cpu_time_supported()) {
99 _optional_support.isCurrentThreadCpuTimeSupported = 1;
100 _optional_support.isOtherThreadCpuTimeSupported = 1;
101 } else {
102 _optional_support.isCurrentThreadCpuTimeSupported = 0;
103 _optional_support.isOtherThreadCpuTimeSupported = 0;
104 }
105
106 _optional_support.isBootClassPathSupported = 1;
107 _optional_support.isObjectMonitorUsageSupported = 1;
108 #ifndef SERVICES_KERNEL
109 // This depends on the heap inspector
110 _optional_support.isSynchronizerUsageSupported = 1;
111 #endif // SERVICES_KERNEL
112 _optional_support.isThreadAllocatedMemorySupported = 1;
113 }
114
115 void Management::initialize(TRAPS) {
116 // Start the service thread
117 ServiceThread::initialize();
118
119 if (ManagementServer) {
120 ResourceMark rm(THREAD);
121 HandleMark hm(THREAD);
122
123 // Load and initialize the sun.management.Agent class
124 // invoke startAgent method to start the management server
125 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
126 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::sun_management_Agent(),
127 loader,
128 Handle(),
129 true,
130 CHECK);
131 instanceKlassHandle ik (THREAD, k);
132
133 JavaValue result(T_VOID);
134 JavaCalls::call_static(&result,
135 ik,
136 vmSymbolHandles::startAgent_name(),
137 vmSymbolHandles::void_method_signature(),
138 CHECK);
139 }
140 }
141
142 void Management::get_optional_support(jmmOptionalSupport* support) {
143 memcpy(support, &_optional_support, sizeof(jmmOptionalSupport));
144 }
145
146 klassOop Management::load_and_initialize_klass(symbolHandle sh, TRAPS) {
147 klassOop k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
148 instanceKlassHandle ik (THREAD, k);
149 if (ik->should_be_initialized()) {
150 ik->initialize(CHECK_NULL);
151 }
152 return ik();
153 }
154
155 void Management::record_vm_startup_time(jlong begin, jlong duration) {
156 // if the performance counter is not initialized,
157 // then vm initialization failed; simply return.
158 if (_begin_vm_creation_time == NULL) return;
159
160 _begin_vm_creation_time->set_value(begin);
161 _end_vm_creation_time->set_value(begin + duration);
162 PerfMemory::set_accessible(true);
163 }
164
165 jlong Management::timestamp() {
166 TimeStamp t;
167 t.update();
168 return t.ticks() - _stamp.ticks();
169 }
170
171 void Management::oops_do(OopClosure* f) {
172 MemoryService::oops_do(f);
173 ThreadService::oops_do(f);
174
175 f->do_oop((oop*) &_sensor_klass);
176 f->do_oop((oop*) &_threadInfo_klass);
177 f->do_oop((oop*) &_memoryUsage_klass);
178 f->do_oop((oop*) &_memoryPoolMXBean_klass);
179 f->do_oop((oop*) &_memoryManagerMXBean_klass);
180 f->do_oop((oop*) &_garbageCollectorMXBean_klass);
181 f->do_oop((oop*) &_managementFactory_klass);
182 }
183
184 klassOop Management::java_lang_management_ThreadInfo_klass(TRAPS) {
185 if (_threadInfo_klass == NULL) {
186 _threadInfo_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_ThreadInfo(), CHECK_NULL);
187 }
188 return _threadInfo_klass;
189 }
190
191 klassOop Management::java_lang_management_MemoryUsage_klass(TRAPS) {
192 if (_memoryUsage_klass == NULL) {
193 _memoryUsage_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_MemoryUsage(), CHECK_NULL);
194 }
195 return _memoryUsage_klass;
196 }
197
198 klassOop Management::java_lang_management_MemoryPoolMXBean_klass(TRAPS) {
199 if (_memoryPoolMXBean_klass == NULL) {
200 _memoryPoolMXBean_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_MemoryPoolMXBean(), CHECK_NULL);
201 }
202 return _memoryPoolMXBean_klass;
203 }
204
205 klassOop Management::java_lang_management_MemoryManagerMXBean_klass(TRAPS) {
206 if (_memoryManagerMXBean_klass == NULL) {
207 _memoryManagerMXBean_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_MemoryManagerMXBean(), CHECK_NULL);
208 }
209 return _memoryManagerMXBean_klass;
210 }
211
212 klassOop Management::java_lang_management_GarbageCollectorMXBean_klass(TRAPS) {
213 if (_garbageCollectorMXBean_klass == NULL) {
214 _garbageCollectorMXBean_klass = load_and_initialize_klass(vmSymbolHandles::java_lang_management_GarbageCollectorMXBean(), CHECK_NULL);
215 }
216 return _garbageCollectorMXBean_klass;
217 }
218
219 klassOop Management::sun_management_Sensor_klass(TRAPS) {
220 if (_sensor_klass == NULL) {
221 _sensor_klass = load_and_initialize_klass(vmSymbolHandles::sun_management_Sensor(), CHECK_NULL);
222 }
223 return _sensor_klass;
224 }
225
226 klassOop Management::sun_management_ManagementFactory_klass(TRAPS) {
227 if (_managementFactory_klass == NULL) {
228 _managementFactory_klass = load_and_initialize_klass(vmSymbolHandles::sun_management_ManagementFactory(), CHECK_NULL);
229 }
230 return _managementFactory_klass;
231 }
232
233 static void initialize_ThreadInfo_constructor_arguments(JavaCallArguments* args, ThreadSnapshot* snapshot, TRAPS) {
234 Handle snapshot_thread(THREAD, snapshot->threadObj());
235
236 jlong contended_time;
237 jlong waited_time;
238 if (ThreadService::is_thread_monitoring_contention()) {
239 contended_time = Management::ticks_to_ms(snapshot->contended_enter_ticks());
240 waited_time = Management::ticks_to_ms(snapshot->monitor_wait_ticks() + snapshot->sleep_ticks());
241 } else {
242 // set them to -1 if thread contention monitoring is disabled.
243 contended_time = max_julong;
244 waited_time = max_julong;
245 }
246
247 int thread_status = snapshot->thread_status();
248 assert((thread_status & JMM_THREAD_STATE_FLAG_MASK) == 0, "Flags already set in thread_status in Thread object");
249 if (snapshot->is_ext_suspended()) {
250 thread_status |= JMM_THREAD_STATE_FLAG_SUSPENDED;
251 }
252 if (snapshot->is_in_native()) {
253 thread_status |= JMM_THREAD_STATE_FLAG_NATIVE;
254 }
255
256 ThreadStackTrace* st = snapshot->get_stack_trace();
257 Handle stacktrace_h;
258 if (st != NULL) {
259 stacktrace_h = st->allocate_fill_stack_trace_element_array(CHECK);
260 } else {
261 stacktrace_h = Handle();
262 }
263
264 args->push_oop(snapshot_thread);
265 args->push_int(thread_status);
266 args->push_oop(Handle(THREAD, snapshot->blocker_object()));
267 args->push_oop(Handle(THREAD, snapshot->blocker_object_owner()));
268 args->push_long(snapshot->contended_enter_count());
269 args->push_long(contended_time);
270 args->push_long(snapshot->monitor_wait_count() + snapshot->sleep_count());
271 args->push_long(waited_time);
272 args->push_oop(stacktrace_h);
273 }
274
275 // Helper function to construct a ThreadInfo object
276 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS) {
277 klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
278 instanceKlassHandle ik (THREAD, k);
279
280 JavaValue result(T_VOID);
281 JavaCallArguments args(14);
282
283 // First allocate a ThreadObj object and
284 // push the receiver as the first argument
285 Handle element = ik->allocate_instance_handle(CHECK_NULL);
286 args.push_oop(element);
287
288 // initialize the arguments for the ThreadInfo constructor
289 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
290
291 // Call ThreadInfo constructor with no locked monitors and synchronizers
292 JavaCalls::call_special(&result,
293 ik,
294 vmSymbolHandles::object_initializer_name(),
295 vmSymbolHandles::java_lang_management_ThreadInfo_constructor_signature(),
296 &args,
297 CHECK_NULL);
298
299 return (instanceOop) element();
300 }
301
302 instanceOop Management::create_thread_info_instance(ThreadSnapshot* snapshot,
303 objArrayHandle monitors_array,
304 typeArrayHandle depths_array,
305 objArrayHandle synchronizers_array,
306 TRAPS) {
307 klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
308 instanceKlassHandle ik (THREAD, k);
309
310 JavaValue result(T_VOID);
311 JavaCallArguments args(17);
312
313 // First allocate a ThreadObj object and
314 // push the receiver as the first argument
315 Handle element = ik->allocate_instance_handle(CHECK_NULL);
316 args.push_oop(element);
317
318 // initialize the arguments for the ThreadInfo constructor
319 initialize_ThreadInfo_constructor_arguments(&args, snapshot, CHECK_NULL);
320
321 // push the locked monitors and synchronizers in the arguments
322 args.push_oop(monitors_array);
323 args.push_oop(depths_array);
324 args.push_oop(synchronizers_array);
325
326 // Call ThreadInfo constructor with locked monitors and synchronizers
327 JavaCalls::call_special(&result,
328 ik,
329 vmSymbolHandles::object_initializer_name(),
330 vmSymbolHandles::java_lang_management_ThreadInfo_with_locks_constructor_signature(),
331 &args,
332 CHECK_NULL);
333
334 return (instanceOop) element();
335 }
336
337 // Helper functions
338 static JavaThread* find_java_thread_from_id(jlong thread_id) {
339 assert(Threads_lock->owned_by_self(), "Must hold Threads_lock");
340
341 JavaThread* java_thread = NULL;
342 // Sequential search for now. Need to do better optimization later.
343 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
344 oop tobj = thread->threadObj();
345 if (!thread->is_exiting() &&
346 tobj != NULL &&
347 thread_id == java_lang_Thread::thread_id(tobj)) {
348 java_thread = thread;
349 break;
350 }
351 }
352 return java_thread;
353 }
354
355 static GCMemoryManager* get_gc_memory_manager_from_jobject(jobject mgr, TRAPS) {
356 if (mgr == NULL) {
357 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
358 }
359 oop mgr_obj = JNIHandles::resolve(mgr);
360 instanceHandle h(THREAD, (instanceOop) mgr_obj);
361
362 klassOop k = Management::java_lang_management_GarbageCollectorMXBean_klass(CHECK_NULL);
363 if (!h->is_a(k)) {
364 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
365 "the object is not an instance of java.lang.management.GarbageCollectorMXBean class",
366 NULL);
367 }
368
369 MemoryManager* gc = MemoryService::get_memory_manager(h);
370 if (gc == NULL || !gc->is_gc_memory_manager()) {
371 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
372 "Invalid GC memory manager",
373 NULL);
374 }
375 return (GCMemoryManager*) gc;
376 }
377
378 static MemoryPool* get_memory_pool_from_jobject(jobject obj, TRAPS) {
379 if (obj == NULL) {
380 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
381 }
382
383 oop pool_obj = JNIHandles::resolve(obj);
384 assert(pool_obj->is_instance(), "Should be an instanceOop");
385 instanceHandle ph(THREAD, (instanceOop) pool_obj);
386
387 return MemoryService::get_memory_pool(ph);
388 }
389
390 static void validate_thread_id_array(typeArrayHandle ids_ah, TRAPS) {
391 int num_threads = ids_ah->length();
392
393 // Validate input thread IDs
394 int i = 0;
395 for (i = 0; i < num_threads; i++) {
396 jlong tid = ids_ah->long_at(i);
397 if (tid <= 0) {
398 // throw exception if invalid thread id.
399 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
400 "Invalid thread ID entry");
401 }
402 }
403 }
404
405 static void validate_thread_info_array(objArrayHandle infoArray_h, TRAPS) {
406 // check if the element of infoArray is of type ThreadInfo class
407 klassOop threadinfo_klass = Management::java_lang_management_ThreadInfo_klass(CHECK);
408 klassOop element_klass = objArrayKlass::cast(infoArray_h->klass())->element_klass();
409 if (element_klass != threadinfo_klass) {
410 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
411 "infoArray element type is not ThreadInfo class");
412 }
413 }
414
415
416 static MemoryManager* get_memory_manager_from_jobject(jobject obj, TRAPS) {
417 if (obj == NULL) {
418 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
419 }
420
421 oop mgr_obj = JNIHandles::resolve(obj);
422 assert(mgr_obj->is_instance(), "Should be an instanceOop");
423 instanceHandle mh(THREAD, (instanceOop) mgr_obj);
424
425 return MemoryService::get_memory_manager(mh);
426 }
427
428 // Returns a version string and sets major and minor version if
429 // the input parameters are non-null.
430 JVM_LEAF(jint, jmm_GetVersion(JNIEnv *env))
431 return JMM_VERSION;
432 JVM_END
433
434 // Gets the list of VM monitoring and management optional supports
435 // Returns 0 if succeeded; otherwise returns non-zero.
436 JVM_LEAF(jint, jmm_GetOptionalSupport(JNIEnv *env, jmmOptionalSupport* support))
437 if (support == NULL) {
438 return -1;
439 }
440 Management::get_optional_support(support);
441 return 0;
442 JVM_END
443
444 // Returns a java.lang.String object containing the input arguments to the VM.
445 JVM_ENTRY(jobject, jmm_GetInputArguments(JNIEnv *env))
446 ResourceMark rm(THREAD);
447
448 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
449 return NULL;
450 }
451
452 char** vm_flags = Arguments::jvm_flags_array();
453 char** vm_args = Arguments::jvm_args_array();
454 int num_flags = Arguments::num_jvm_flags();
455 int num_args = Arguments::num_jvm_args();
456
457 size_t length = 1; // null terminator
458 int i;
459 for (i = 0; i < num_flags; i++) {
460 length += strlen(vm_flags[i]);
461 }
462 for (i = 0; i < num_args; i++) {
463 length += strlen(vm_args[i]);
464 }
465 // add a space between each argument
466 length += num_flags + num_args - 1;
467
468 // Return the list of input arguments passed to the VM
469 // and preserve the order that the VM processes.
470 char* args = NEW_RESOURCE_ARRAY(char, length);
471 args[0] = '\0';
472 // concatenate all jvm_flags
473 if (num_flags > 0) {
474 strcat(args, vm_flags[0]);
475 for (i = 1; i < num_flags; i++) {
476 strcat(args, " ");
477 strcat(args, vm_flags[i]);
478 }
479 }
480
481 if (num_args > 0 && num_flags > 0) {
482 // append a space if args already contains one or more jvm_flags
483 strcat(args, " ");
484 }
485
486 // concatenate all jvm_args
487 if (num_args > 0) {
488 strcat(args, vm_args[0]);
489 for (i = 1; i < num_args; i++) {
490 strcat(args, " ");
491 strcat(args, vm_args[i]);
492 }
493 }
494
495 Handle hargs = java_lang_String::create_from_platform_dependent_str(args, CHECK_NULL);
496 return JNIHandles::make_local(env, hargs());
497 JVM_END
498
499 // Returns an array of java.lang.String object containing the input arguments to the VM.
500 JVM_ENTRY(jobjectArray, jmm_GetInputArgumentArray(JNIEnv *env))
501 ResourceMark rm(THREAD);
502
503 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
504 return NULL;
505 }
506
507 char** vm_flags = Arguments::jvm_flags_array();
508 char** vm_args = Arguments::jvm_args_array();
509 int num_flags = Arguments::num_jvm_flags();
510 int num_args = Arguments::num_jvm_args();
511
512 instanceKlassHandle ik (THREAD, SystemDictionary::String_klass());
513 objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL);
514 objArrayHandle result_h(THREAD, r);
515
516 int index = 0;
517 for (int j = 0; j < num_flags; j++, index++) {
518 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
519 result_h->obj_at_put(index, h());
520 }
521 for (int i = 0; i < num_args; i++, index++) {
522 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
523 result_h->obj_at_put(index, h());
524 }
525 return (jobjectArray) JNIHandles::make_local(env, result_h());
526 JVM_END
527
528 // Returns an array of java/lang/management/MemoryPoolMXBean object
529 // one for each memory pool if obj == null; otherwise returns
530 // an array of memory pools for a given memory manager if
531 // it is a valid memory manager.
532 JVM_ENTRY(jobjectArray, jmm_GetMemoryPools(JNIEnv* env, jobject obj))
533 ResourceMark rm(THREAD);
534
535 int num_memory_pools;
536 MemoryManager* mgr = NULL;
537 if (obj == NULL) {
538 num_memory_pools = MemoryService::num_memory_pools();
539 } else {
540 mgr = get_memory_manager_from_jobject(obj, CHECK_NULL);
541 if (mgr == NULL) {
542 return NULL;
543 }
544 num_memory_pools = mgr->num_memory_pools();
545 }
546
547 // Allocate the resulting MemoryPoolMXBean[] object
548 klassOop k = Management::java_lang_management_MemoryPoolMXBean_klass(CHECK_NULL);
549 instanceKlassHandle ik (THREAD, k);
550 objArrayOop r = oopFactory::new_objArray(ik(), num_memory_pools, CHECK_NULL);
551 objArrayHandle poolArray(THREAD, r);
552
553 if (mgr == NULL) {
554 // Get all memory pools
555 for (int i = 0; i < num_memory_pools; i++) {
556 MemoryPool* pool = MemoryService::get_memory_pool(i);
557 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
558 instanceHandle ph(THREAD, p);
559 poolArray->obj_at_put(i, ph());
560 }
561 } else {
562 // Get memory pools managed by a given memory manager
563 for (int i = 0; i < num_memory_pools; i++) {
564 MemoryPool* pool = mgr->get_memory_pool(i);
565 instanceOop p = pool->get_memory_pool_instance(CHECK_NULL);
566 instanceHandle ph(THREAD, p);
567 poolArray->obj_at_put(i, ph());
568 }
569 }
570 return (jobjectArray) JNIHandles::make_local(env, poolArray());
571 JVM_END
572
573 // Returns an array of java/lang/management/MemoryManagerMXBean object
574 // one for each memory manager if obj == null; otherwise returns
575 // an array of memory managers for a given memory pool if
576 // it is a valid memory pool.
577 JVM_ENTRY(jobjectArray, jmm_GetMemoryManagers(JNIEnv* env, jobject obj))
578 ResourceMark rm(THREAD);
579
580 int num_mgrs;
581 MemoryPool* pool = NULL;
582 if (obj == NULL) {
583 num_mgrs = MemoryService::num_memory_managers();
584 } else {
585 pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
586 if (pool == NULL) {
587 return NULL;
588 }
589 num_mgrs = pool->num_memory_managers();
590 }
591
592 // Allocate the resulting MemoryManagerMXBean[] object
593 klassOop k = Management::java_lang_management_MemoryManagerMXBean_klass(CHECK_NULL);
594 instanceKlassHandle ik (THREAD, k);
595 objArrayOop r = oopFactory::new_objArray(ik(), num_mgrs, CHECK_NULL);
596 objArrayHandle mgrArray(THREAD, r);
597
598 if (pool == NULL) {
599 // Get all memory managers
600 for (int i = 0; i < num_mgrs; i++) {
601 MemoryManager* mgr = MemoryService::get_memory_manager(i);
602 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
603 instanceHandle ph(THREAD, p);
604 mgrArray->obj_at_put(i, ph());
605 }
606 } else {
607 // Get memory managers for a given memory pool
608 for (int i = 0; i < num_mgrs; i++) {
609 MemoryManager* mgr = pool->get_memory_manager(i);
610 instanceOop p = mgr->get_memory_manager_instance(CHECK_NULL);
611 instanceHandle ph(THREAD, p);
612 mgrArray->obj_at_put(i, ph());
613 }
614 }
615 return (jobjectArray) JNIHandles::make_local(env, mgrArray());
616 JVM_END
617
618
619 // Returns a java/lang/management/MemoryUsage object containing the memory usage
620 // of a given memory pool.
621 JVM_ENTRY(jobject, jmm_GetMemoryPoolUsage(JNIEnv* env, jobject obj))
622 ResourceMark rm(THREAD);
623
624 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
625 if (pool != NULL) {
626 MemoryUsage usage = pool->get_memory_usage();
627 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
628 return JNIHandles::make_local(env, h());
629 } else {
630 return NULL;
631 }
632 JVM_END
633
634 // Returns a java/lang/management/MemoryUsage object containing the memory usage
635 // of a given memory pool.
636 JVM_ENTRY(jobject, jmm_GetPeakMemoryPoolUsage(JNIEnv* env, jobject obj))
637 ResourceMark rm(THREAD);
638
639 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
640 if (pool != NULL) {
641 MemoryUsage usage = pool->get_peak_memory_usage();
642 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
643 return JNIHandles::make_local(env, h());
644 } else {
645 return NULL;
646 }
647 JVM_END
648
649 // Returns a java/lang/management/MemoryUsage object containing the memory usage
650 // of a given memory pool after most recent GC.
651 JVM_ENTRY(jobject, jmm_GetPoolCollectionUsage(JNIEnv* env, jobject obj))
652 ResourceMark rm(THREAD);
653
654 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_NULL);
655 if (pool != NULL && pool->is_collected_pool()) {
656 MemoryUsage usage = pool->get_last_collection_usage();
657 Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
658 return JNIHandles::make_local(env, h());
659 } else {
660 return NULL;
661 }
662 JVM_END
663
664 // Sets the memory pool sensor for a threshold type
665 JVM_ENTRY(void, jmm_SetPoolSensor(JNIEnv* env, jobject obj, jmmThresholdType type, jobject sensorObj))
666 if (obj == NULL || sensorObj == NULL) {
667 THROW(vmSymbols::java_lang_NullPointerException());
668 }
669
670 klassOop sensor_klass = Management::sun_management_Sensor_klass(CHECK);
671 oop s = JNIHandles::resolve(sensorObj);
672 assert(s->is_instance(), "Sensor should be an instanceOop");
673 instanceHandle sensor_h(THREAD, (instanceOop) s);
674 if (!sensor_h->is_a(sensor_klass)) {
675 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
676 "Sensor is not an instance of sun.management.Sensor class");
677 }
678
679 MemoryPool* mpool = get_memory_pool_from_jobject(obj, CHECK);
680 assert(mpool != NULL, "MemoryPool should exist");
681
682 switch (type) {
683 case JMM_USAGE_THRESHOLD_HIGH:
684 case JMM_USAGE_THRESHOLD_LOW:
685 // have only one sensor for threshold high and low
686 mpool->set_usage_sensor_obj(sensor_h);
687 break;
688 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
689 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
690 // have only one sensor for threshold high and low
691 mpool->set_gc_usage_sensor_obj(sensor_h);
692 break;
693 default:
694 assert(false, "Unrecognized type");
695 }
696
697 JVM_END
698
699
700 // Sets the threshold of a given memory pool.
701 // Returns the previous threshold.
702 //
703 // Input parameters:
704 // pool - the MemoryPoolMXBean object
705 // type - threshold type
706 // threshold - the new threshold (must not be negative)
707 //
708 JVM_ENTRY(jlong, jmm_SetPoolThreshold(JNIEnv* env, jobject obj, jmmThresholdType type, jlong threshold))
709 if (threshold < 0) {
710 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
711 "Invalid threshold value",
712 -1);
713 }
714
715 if ((size_t)threshold > max_uintx) {
716 stringStream st;
717 st.print("Invalid valid threshold value. Threshold value (" UINT64_FORMAT ") > max value of size_t (" SIZE_FORMAT ")", (size_t)threshold, max_uintx);
718 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), st.as_string(), -1);
719 }
720
721 MemoryPool* pool = get_memory_pool_from_jobject(obj, CHECK_(0L));
722 assert(pool != NULL, "MemoryPool should exist");
723
724 jlong prev = 0;
725 switch (type) {
726 case JMM_USAGE_THRESHOLD_HIGH:
727 if (!pool->usage_threshold()->is_high_threshold_supported()) {
728 return -1;
729 }
730 prev = pool->usage_threshold()->set_high_threshold((size_t) threshold);
731 break;
732
733 case JMM_USAGE_THRESHOLD_LOW:
734 if (!pool->usage_threshold()->is_low_threshold_supported()) {
735 return -1;
736 }
737 prev = pool->usage_threshold()->set_low_threshold((size_t) threshold);
738 break;
739
740 case JMM_COLLECTION_USAGE_THRESHOLD_HIGH:
741 if (!pool->gc_usage_threshold()->is_high_threshold_supported()) {
742 return -1;
743 }
744 // return and the new threshold is effective for the next GC
745 return pool->gc_usage_threshold()->set_high_threshold((size_t) threshold);
746
747 case JMM_COLLECTION_USAGE_THRESHOLD_LOW:
748 if (!pool->gc_usage_threshold()->is_low_threshold_supported()) {
749 return -1;
750 }
751 // return and the new threshold is effective for the next GC
752 return pool->gc_usage_threshold()->set_low_threshold((size_t) threshold);
753
754 default:
755 assert(false, "Unrecognized type");
756 return -1;
757 }
758
759 // When the threshold is changed, reevaluate if the low memory
760 // detection is enabled.
761 if (prev != threshold) {
762 LowMemoryDetector::recompute_enabled_for_collected_pools();
763 LowMemoryDetector::detect_low_memory(pool);
764 }
765 return prev;
766 JVM_END
767
768 // Gets an array containing the amount of memory allocated on the Java
769 // heap for a set of threads (in bytes). Each element of the array is
770 // the amount of memory allocated for the thread ID specified in the
771 // corresponding entry in the given array of thread IDs; or -1 if the
772 // thread does not exist or has terminated.
773 JVM_ENTRY(void, jmm_GetThreadAllocatedMemory(JNIEnv *env, jlongArray ids,
774 jlongArray sizeArray))
775 // Check if threads is null
776 if (ids == NULL || sizeArray == NULL) {
777 THROW(vmSymbols::java_lang_NullPointerException());
778 }
779
780 ResourceMark rm(THREAD);
781 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
782 typeArrayHandle ids_ah(THREAD, ta);
783
784 typeArrayOop sa = typeArrayOop(JNIHandles::resolve_non_null(sizeArray));
785 typeArrayHandle sizeArray_h(THREAD, sa);
786
787 // validate the thread id array
788 validate_thread_id_array(ids_ah, CHECK);
789
790 // sizeArray must be of the same length as the given array of thread IDs
791 int num_threads = ids_ah->length();
792 if (num_threads != sizeArray_h->length()) {
793 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
794 "The length of the given long array does not match the length of "
795 "the given array of thread IDs");
796 }
797
798 MutexLockerEx ml(Threads_lock);
799 for (int i = 0; i < num_threads; i++) {
800 JavaThread* java_thread = find_java_thread_from_id(ids_ah->long_at(i));
801 if (java_thread != NULL) {
802 sizeArray_h->long_at_put(i, java_thread->cooked_allocated_bytes());
803 }
804 }
805 JVM_END
806
807 // Returns a java/lang/management/MemoryUsage object representing
808 // the memory usage for the heap or non-heap memory.
809 JVM_ENTRY(jobject, jmm_GetMemoryUsage(JNIEnv* env, jboolean heap))
810 ResourceMark rm(THREAD);
811
812 // Calculate the memory usage
813 size_t total_init = 0;
814 size_t total_used = 0;
815 size_t total_committed = 0;
816 size_t total_max = 0;
817 bool has_undefined_init_size = false;
818 bool has_undefined_max_size = false;
819
820 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
821 MemoryPool* pool = MemoryService::get_memory_pool(i);
822 if ((heap && pool->is_heap()) || (!heap && pool->is_non_heap())) {
823 MemoryUsage u = pool->get_memory_usage();
824 total_used += u.used();
825 total_committed += u.committed();
826
827 // if any one of the memory pool has undefined init_size or max_size,
828 // set it to -1
829 if (u.init_size() == (size_t)-1) {
830 has_undefined_init_size = true;
831 }
832 if (!has_undefined_init_size) {
833 total_init += u.init_size();
834 }
835
836 if (u.max_size() == (size_t)-1) {
837 has_undefined_max_size = true;
838 }
839 if (!has_undefined_max_size) {
840 total_max += u.max_size();
841 }
842 }
843 }
844
845 // In our current implementation, we make sure that all non-heap
846 // pools have defined init and max sizes. Heap pools do not matter,
847 // as we never use total_init and total_max for them.
848 assert(heap || !has_undefined_init_size, "Undefined init size");
849 assert(heap || !has_undefined_max_size, "Undefined max size");
850
851 MemoryUsage usage((heap ? InitialHeapSize : total_init),
852 total_used,
853 total_committed,
854 (heap ? Universe::heap()->max_capacity() : total_max));
855
856 Handle obj = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
857 return JNIHandles::make_local(env, obj());
858 JVM_END
859
860 // Returns the boolean value of a given attribute.
861 JVM_LEAF(jboolean, jmm_GetBoolAttribute(JNIEnv *env, jmmBoolAttribute att))
862 switch (att) {
863 case JMM_VERBOSE_GC:
864 return MemoryService::get_verbose();
865 case JMM_VERBOSE_CLASS:
866 return ClassLoadingService::get_verbose();
867 case JMM_THREAD_CONTENTION_MONITORING:
868 return ThreadService::is_thread_monitoring_contention();
869 case JMM_THREAD_CPU_TIME:
870 return ThreadService::is_thread_cpu_time_enabled();
871 case JMM_THREAD_ALLOCATED_MEMORY:
872 return ThreadService::is_thread_allocated_memory_enabled();
873 default:
874 assert(0, "Unrecognized attribute");
875 return false;
876 }
877 JVM_END
878
879 // Sets the given boolean attribute and returns the previous value.
880 JVM_ENTRY(jboolean, jmm_SetBoolAttribute(JNIEnv *env, jmmBoolAttribute att, jboolean flag))
881 switch (att) {
882 case JMM_VERBOSE_GC:
883 return MemoryService::set_verbose(flag != 0);
884 case JMM_VERBOSE_CLASS:
885 return ClassLoadingService::set_verbose(flag != 0);
886 case JMM_THREAD_CONTENTION_MONITORING:
887 return ThreadService::set_thread_monitoring_contention(flag != 0);
888 case JMM_THREAD_CPU_TIME:
889 return ThreadService::set_thread_cpu_time_enabled(flag != 0);
890 case JMM_THREAD_ALLOCATED_MEMORY:
891 return ThreadService::set_thread_allocated_memory_enabled(flag != 0);
892 default:
893 assert(0, "Unrecognized attribute");
894 return false;
895 }
896 JVM_END
897
898
899 static jlong get_gc_attribute(GCMemoryManager* mgr, jmmLongAttribute att) {
900 switch (att) {
901 case JMM_GC_TIME_MS:
902 return mgr->gc_time_ms();
903
904 case JMM_GC_COUNT:
905 return mgr->gc_count();
906
907 case JMM_GC_EXT_ATTRIBUTE_INFO_SIZE:
908 // current implementation only has 1 ext attribute
909 return 1;
910
911 default:
912 assert(0, "Unrecognized GC attribute");
913 return -1;
914 }
915 }
916
917 class VmThreadCountClosure: public ThreadClosure {
918 private:
919 int _count;
920 public:
921 VmThreadCountClosure() : _count(0) {};
922 void do_thread(Thread* thread);
923 int count() { return _count; }
924 };
925
926 void VmThreadCountClosure::do_thread(Thread* thread) {
927 // exclude externally visible JavaThreads
928 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
929 return;
930 }
931
932 _count++;
933 }
934
935 static jint get_vm_thread_count() {
936 VmThreadCountClosure vmtcc;
937 {
938 MutexLockerEx ml(Threads_lock);
939 Threads::threads_do(&vmtcc);
940 }
941
942 return vmtcc.count();
943 }
944
945 static jint get_num_flags() {
946 // last flag entry is always NULL, so subtract 1
947 int nFlags = (int) Flag::numFlags - 1;
948 int count = 0;
949 for (int i = 0; i < nFlags; i++) {
950 Flag* flag = &Flag::flags[i];
951 // Exclude the locked (diagnostic, experimental) flags
952 if (flag->is_unlocked() || flag->is_unlocker()) {
953 count++;
954 }
955 }
956 return count;
957 }
958
959 static jlong get_long_attribute(jmmLongAttribute att) {
960 switch (att) {
961 case JMM_CLASS_LOADED_COUNT:
962 return ClassLoadingService::loaded_class_count();
963
964 case JMM_CLASS_UNLOADED_COUNT:
965 return ClassLoadingService::unloaded_class_count();
966
967 case JMM_THREAD_TOTAL_COUNT:
968 return ThreadService::get_total_thread_count();
969
970 case JMM_THREAD_LIVE_COUNT:
971 return ThreadService::get_live_thread_count();
972
973 case JMM_THREAD_PEAK_COUNT:
974 return ThreadService::get_peak_thread_count();
975
976 case JMM_THREAD_DAEMON_COUNT:
977 return ThreadService::get_daemon_thread_count();
978
979 case JMM_JVM_INIT_DONE_TIME_MS:
980 return Management::vm_init_done_time();
981
982 case JMM_COMPILE_TOTAL_TIME_MS:
983 return Management::ticks_to_ms(CompileBroker::total_compilation_ticks());
984
985 case JMM_OS_PROCESS_ID:
986 return os::current_process_id();
987
988 // Hotspot-specific counters
989 case JMM_CLASS_LOADED_BYTES:
990 return ClassLoadingService::loaded_class_bytes();
991
992 case JMM_CLASS_UNLOADED_BYTES:
993 return ClassLoadingService::unloaded_class_bytes();
994
995 case JMM_SHARED_CLASS_LOADED_COUNT:
996 return ClassLoadingService::loaded_shared_class_count();
997
998 case JMM_SHARED_CLASS_UNLOADED_COUNT:
999 return ClassLoadingService::unloaded_shared_class_count();
1000
1001
1002 case JMM_SHARED_CLASS_LOADED_BYTES:
1003 return ClassLoadingService::loaded_shared_class_bytes();
1004
1005 case JMM_SHARED_CLASS_UNLOADED_BYTES:
1006 return ClassLoadingService::unloaded_shared_class_bytes();
1007
1008 case JMM_TOTAL_CLASSLOAD_TIME_MS:
1009 return ClassLoader::classloader_time_ms();
1010
1011 case JMM_VM_GLOBAL_COUNT:
1012 return get_num_flags();
1013
1014 case JMM_SAFEPOINT_COUNT:
1015 return RuntimeService::safepoint_count();
1016
1017 case JMM_TOTAL_SAFEPOINTSYNC_TIME_MS:
1018 return RuntimeService::safepoint_sync_time_ms();
1019
1020 case JMM_TOTAL_STOPPED_TIME_MS:
1021 return RuntimeService::safepoint_time_ms();
1022
1023 case JMM_TOTAL_APP_TIME_MS:
1024 return RuntimeService::application_time_ms();
1025
1026 case JMM_VM_THREAD_COUNT:
1027 return get_vm_thread_count();
1028
1029 case JMM_CLASS_INIT_TOTAL_COUNT:
1030 return ClassLoader::class_init_count();
1031
1032 case JMM_CLASS_INIT_TOTAL_TIME_MS:
1033 return ClassLoader::class_init_time_ms();
1034
1035 case JMM_CLASS_VERIFY_TOTAL_TIME_MS:
1036 return ClassLoader::class_verify_time_ms();
1037
1038 case JMM_METHOD_DATA_SIZE_BYTES:
1039 return ClassLoadingService::class_method_data_size();
1040
1041 case JMM_OS_MEM_TOTAL_PHYSICAL_BYTES:
1042 return os::physical_memory();
1043
1044 default:
1045 return -1;
1046 }
1047 }
1048
1049
1050 // Returns the long value of a given attribute.
1051 JVM_ENTRY(jlong, jmm_GetLongAttribute(JNIEnv *env, jobject obj, jmmLongAttribute att))
1052 if (obj == NULL) {
1053 return get_long_attribute(att);
1054 } else {
1055 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_(0L));
1056 if (mgr != NULL) {
1057 return get_gc_attribute(mgr, att);
1058 }
1059 }
1060 return -1;
1061 JVM_END
1062
1063 // Gets the value of all attributes specified in the given array
1064 // and sets the value in the result array.
1065 // Returns the number of attributes found.
1066 JVM_ENTRY(jint, jmm_GetLongAttributes(JNIEnv *env,
1067 jobject obj,
1068 jmmLongAttribute* atts,
1069 jint count,
1070 jlong* result))
1071
1072 int num_atts = 0;
1073 if (obj == NULL) {
1074 for (int i = 0; i < count; i++) {
1075 result[i] = get_long_attribute(atts[i]);
1076 if (result[i] != -1) {
1077 num_atts++;
1078 }
1079 }
1080 } else {
1081 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK_0);
1082 for (int i = 0; i < count; i++) {
1083 result[i] = get_gc_attribute(mgr, atts[i]);
1084 if (result[i] != -1) {
1085 num_atts++;
1086 }
1087 }
1088 }
1089 return num_atts;
1090 JVM_END
1091
1092 // Helper function to do thread dump for a specific list of threads
1093 static void do_thread_dump(ThreadDumpResult* dump_result,
1094 typeArrayHandle ids_ah, // array of thread ID (long[])
1095 int num_threads,
1096 int max_depth,
1097 bool with_locked_monitors,
1098 bool with_locked_synchronizers,
1099 TRAPS) {
1100
1101 // First get an array of threadObj handles.
1102 // A JavaThread may terminate before we get the stack trace.
1103 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
1104 {
1105 MutexLockerEx ml(Threads_lock);
1106 for (int i = 0; i < num_threads; i++) {
1107 jlong tid = ids_ah->long_at(i);
1108 JavaThread* jt = find_java_thread_from_id(tid);
1109 oop thread_obj = (jt != NULL ? jt->threadObj() : (oop)NULL);
1110 instanceHandle threadObj_h(THREAD, (instanceOop) thread_obj);
1111 thread_handle_array->append(threadObj_h);
1112 }
1113 }
1114
1115 // Obtain thread dumps and thread snapshot information
1116 VM_ThreadDump op(dump_result,
1117 thread_handle_array,
1118 num_threads,
1119 max_depth, /* stack depth */
1120 with_locked_monitors,
1121 with_locked_synchronizers);
1122 VMThread::execute(&op);
1123 }
1124
1125 // Gets an array of ThreadInfo objects. Each element is the ThreadInfo
1126 // for the thread ID specified in the corresponding entry in
1127 // the given array of thread IDs; or NULL if the thread does not exist
1128 // or has terminated.
1129 //
1130 // Input parameters:
1131 // ids - array of thread IDs
1132 // maxDepth - the maximum depth of stack traces to be dumped:
1133 // maxDepth == -1 requests to dump entire stack trace.
1134 // maxDepth == 0 requests no stack trace.
1135 // infoArray - array of ThreadInfo objects
1136 //
1137 // QQQ - Why does this method return a value instead of void?
1138 JVM_ENTRY(jint, jmm_GetThreadInfo(JNIEnv *env, jlongArray ids, jint maxDepth, jobjectArray infoArray))
1139 // Check if threads is null
1140 if (ids == NULL || infoArray == NULL) {
1141 THROW_(vmSymbols::java_lang_NullPointerException(), -1);
1142 }
1143
1144 if (maxDepth < -1) {
1145 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1146 "Invalid maxDepth", -1);
1147 }
1148
1149 ResourceMark rm(THREAD);
1150 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1151 typeArrayHandle ids_ah(THREAD, ta);
1152
1153 oop infoArray_obj = JNIHandles::resolve_non_null(infoArray);
1154 objArrayOop oa = objArrayOop(infoArray_obj);
1155 objArrayHandle infoArray_h(THREAD, oa);
1156
1157 // validate the thread id array
1158 validate_thread_id_array(ids_ah, CHECK_0);
1159
1160 // validate the ThreadInfo[] parameters
1161 validate_thread_info_array(infoArray_h, CHECK_0);
1162
1163 // infoArray must be of the same length as the given array of thread IDs
1164 int num_threads = ids_ah->length();
1165 if (num_threads != infoArray_h->length()) {
1166 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1167 "The length of the given ThreadInfo array does not match the length of the given array of thread IDs", -1);
1168 }
1169
1170 if (JDK_Version::is_gte_jdk16x_version()) {
1171 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1172 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_0);
1173 }
1174
1175 // Must use ThreadDumpResult to store the ThreadSnapshot.
1176 // GC may occur after the thread snapshots are taken but before
1177 // this function returns. The threadObj and other oops kept
1178 // in the ThreadSnapshot are marked and adjusted during GC.
1179 ThreadDumpResult dump_result(num_threads);
1180
1181 if (maxDepth == 0) {
1182 // no stack trace dumped - do not need to stop the world
1183 {
1184 MutexLockerEx ml(Threads_lock);
1185 for (int i = 0; i < num_threads; i++) {
1186 jlong tid = ids_ah->long_at(i);
1187 JavaThread* jt = find_java_thread_from_id(tid);
1188 ThreadSnapshot* ts;
1189 if (jt == NULL) {
1190 // if the thread does not exist or now it is terminated,
1191 // create dummy snapshot
1192 ts = new ThreadSnapshot();
1193 } else {
1194 ts = new ThreadSnapshot(jt);
1195 }
1196 dump_result.add_thread_snapshot(ts);
1197 }
1198 }
1199 } else {
1200 // obtain thread dump with the specific list of threads with stack trace
1201 do_thread_dump(&dump_result,
1202 ids_ah,
1203 num_threads,
1204 maxDepth,
1205 false, /* no locked monitor */
1206 false, /* no locked synchronizers */
1207 CHECK_0);
1208 }
1209
1210 int num_snapshots = dump_result.num_snapshots();
1211 assert(num_snapshots == num_threads, "Must match the number of thread snapshots");
1212 int index = 0;
1213 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; index++, ts = ts->next()) {
1214 // For each thread, create an java/lang/management/ThreadInfo object
1215 // and fill with the thread information
1216
1217 if (ts->threadObj() == NULL) {
1218 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1219 infoArray_h->obj_at_put(index, NULL);
1220 continue;
1221 }
1222
1223 // Create java.lang.management.ThreadInfo object
1224 instanceOop info_obj = Management::create_thread_info_instance(ts, CHECK_0);
1225 infoArray_h->obj_at_put(index, info_obj);
1226 }
1227 return 0;
1228 JVM_END
1229
1230 // Dump thread info for the specified threads.
1231 // It returns an array of ThreadInfo objects. Each element is the ThreadInfo
1232 // for the thread ID specified in the corresponding entry in
1233 // the given array of thread IDs; or NULL if the thread does not exist
1234 // or has terminated.
1235 //
1236 // Input parameter:
1237 // ids - array of thread IDs; NULL indicates all live threads
1238 // locked_monitors - if true, dump locked object monitors
1239 // locked_synchronizers - if true, dump locked JSR-166 synchronizers
1240 //
1241 JVM_ENTRY(jobjectArray, jmm_DumpThreads(JNIEnv *env, jlongArray thread_ids, jboolean locked_monitors, jboolean locked_synchronizers))
1242 ResourceMark rm(THREAD);
1243
1244 if (JDK_Version::is_gte_jdk16x_version()) {
1245 // make sure the AbstractOwnableSynchronizer klass is loaded before taking thread snapshots
1246 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(CHECK_NULL);
1247 }
1248
1249 typeArrayOop ta = typeArrayOop(JNIHandles::resolve(thread_ids));
1250 int num_threads = (ta != NULL ? ta->length() : 0);
1251 typeArrayHandle ids_ah(THREAD, ta);
1252
1253 ThreadDumpResult dump_result(num_threads); // can safepoint
1254
1255 if (ids_ah() != NULL) {
1256
1257 // validate the thread id array
1258 validate_thread_id_array(ids_ah, CHECK_NULL);
1259
1260 // obtain thread dump of a specific list of threads
1261 do_thread_dump(&dump_result,
1262 ids_ah,
1263 num_threads,
1264 -1, /* entire stack */
1265 (locked_monitors ? true : false), /* with locked monitors */
1266 (locked_synchronizers ? true : false), /* with locked synchronizers */
1267 CHECK_NULL);
1268 } else {
1269 // obtain thread dump of all threads
1270 VM_ThreadDump op(&dump_result,
1271 -1, /* entire stack */
1272 (locked_monitors ? true : false), /* with locked monitors */
1273 (locked_synchronizers ? true : false) /* with locked synchronizers */);
1274 VMThread::execute(&op);
1275 }
1276
1277 int num_snapshots = dump_result.num_snapshots();
1278
1279 // create the result ThreadInfo[] object
1280 klassOop k = Management::java_lang_management_ThreadInfo_klass(CHECK_NULL);
1281 instanceKlassHandle ik (THREAD, k);
1282 objArrayOop r = oopFactory::new_objArray(ik(), num_snapshots, CHECK_NULL);
1283 objArrayHandle result_h(THREAD, r);
1284
1285 int index = 0;
1286 for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; ts = ts->next(), index++) {
1287 if (ts->threadObj() == NULL) {
1288 // if the thread does not exist or now it is terminated, set threadinfo to NULL
1289 result_h->obj_at_put(index, NULL);
1290 continue;
1291 }
1292
1293 ThreadStackTrace* stacktrace = ts->get_stack_trace();
1294 assert(stacktrace != NULL, "Must have a stack trace dumped");
1295
1296 // Create Object[] filled with locked monitors
1297 // Create int[] filled with the stack depth where a monitor was locked
1298 int num_frames = stacktrace->get_stack_depth();
1299 int num_locked_monitors = stacktrace->num_jni_locked_monitors();
1300
1301 // Count the total number of locked monitors
1302 for (int i = 0; i < num_frames; i++) {
1303 StackFrameInfo* frame = stacktrace->stack_frame_at(i);
1304 num_locked_monitors += frame->num_locked_monitors();
1305 }
1306
1307 objArrayHandle monitors_array;
1308 typeArrayHandle depths_array;
1309 objArrayHandle synchronizers_array;
1310
1311 if (locked_monitors) {
1312 // Constructs Object[] and int[] to contain the object monitor and the stack depth
1313 // where the thread locked it
1314 objArrayOop array = oopFactory::new_system_objArray(num_locked_monitors, CHECK_NULL);
1315 objArrayHandle mh(THREAD, array);
1316 monitors_array = mh;
1317
1318 typeArrayOop tarray = oopFactory::new_typeArray(T_INT, num_locked_monitors, CHECK_NULL);
1319 typeArrayHandle dh(THREAD, tarray);
1320 depths_array = dh;
1321
1322 int count = 0;
1323 int j = 0;
1324 for (int depth = 0; depth < num_frames; depth++) {
1325 StackFrameInfo* frame = stacktrace->stack_frame_at(depth);
1326 int len = frame->num_locked_monitors();
1327 GrowableArray<oop>* locked_monitors = frame->locked_monitors();
1328 for (j = 0; j < len; j++) {
1329 oop monitor = locked_monitors->at(j);
1330 assert(monitor != NULL && monitor->is_instance(), "must be a Java object");
1331 monitors_array->obj_at_put(count, monitor);
1332 depths_array->int_at_put(count, depth);
1333 count++;
1334 }
1335 }
1336
1337 GrowableArray<oop>* jni_locked_monitors = stacktrace->jni_locked_monitors();
1338 for (j = 0; j < jni_locked_monitors->length(); j++) {
1339 oop object = jni_locked_monitors->at(j);
1340 assert(object != NULL && object->is_instance(), "must be a Java object");
1341 monitors_array->obj_at_put(count, object);
1342 // Monitor locked via JNI MonitorEnter call doesn't have stack depth info
1343 depths_array->int_at_put(count, -1);
1344 count++;
1345 }
1346 assert(count == num_locked_monitors, "number of locked monitors doesn't match");
1347 }
1348
1349 if (locked_synchronizers) {
1350 // Create Object[] filled with locked JSR-166 synchronizers
1351 assert(ts->threadObj() != NULL, "Must be a valid JavaThread");
1352 ThreadConcurrentLocks* tcl = ts->get_concurrent_locks();
1353 GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
1354 int num_locked_synchronizers = (locks != NULL ? locks->length() : 0);
1355
1356 objArrayOop array = oopFactory::new_system_objArray(num_locked_synchronizers, CHECK_NULL);
1357 objArrayHandle sh(THREAD, array);
1358 synchronizers_array = sh;
1359
1360 for (int k = 0; k < num_locked_synchronizers; k++) {
1361 synchronizers_array->obj_at_put(k, locks->at(k));
1362 }
1363 }
1364
1365 // Create java.lang.management.ThreadInfo object
1366 instanceOop info_obj = Management::create_thread_info_instance(ts,
1367 monitors_array,
1368 depths_array,
1369 synchronizers_array,
1370 CHECK_NULL);
1371 result_h->obj_at_put(index, info_obj);
1372 }
1373
1374 return (jobjectArray) JNIHandles::make_local(env, result_h());
1375 JVM_END
1376
1377 // Returns an array of Class objects.
1378 JVM_ENTRY(jobjectArray, jmm_GetLoadedClasses(JNIEnv *env))
1379 ResourceMark rm(THREAD);
1380
1381 LoadedClassesEnumerator lce(THREAD); // Pass current Thread as parameter
1382
1383 int num_classes = lce.num_loaded_classes();
1384 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), num_classes, CHECK_0);
1385 objArrayHandle classes_ah(THREAD, r);
1386
1387 for (int i = 0; i < num_classes; i++) {
1388 KlassHandle kh = lce.get_klass(i);
1389 oop mirror = Klass::cast(kh())->java_mirror();
1390 classes_ah->obj_at_put(i, mirror);
1391 }
1392
1393 return (jobjectArray) JNIHandles::make_local(env, classes_ah());
1394 JVM_END
1395
1396 // Reset statistic. Return true if the requested statistic is reset.
1397 // Otherwise, return false.
1398 //
1399 // Input parameters:
1400 // obj - specify which instance the statistic associated with to be reset
1401 // For PEAK_POOL_USAGE stat, obj is required to be a memory pool object.
1402 // For THREAD_CONTENTION_COUNT and TIME stat, obj is required to be a thread ID.
1403 // type - the type of statistic to be reset
1404 //
1405 JVM_ENTRY(jboolean, jmm_ResetStatistic(JNIEnv *env, jvalue obj, jmmStatisticType type))
1406 ResourceMark rm(THREAD);
1407
1408 switch (type) {
1409 case JMM_STAT_PEAK_THREAD_COUNT:
1410 ThreadService::reset_peak_thread_count();
1411 return true;
1412
1413 case JMM_STAT_THREAD_CONTENTION_COUNT:
1414 case JMM_STAT_THREAD_CONTENTION_TIME: {
1415 jlong tid = obj.j;
1416 if (tid < 0) {
1417 THROW_(vmSymbols::java_lang_IllegalArgumentException(), JNI_FALSE);
1418 }
1419
1420 // Look for the JavaThread of this given tid
1421 MutexLockerEx ml(Threads_lock);
1422 if (tid == 0) {
1423 // reset contention statistics for all threads if tid == 0
1424 for (JavaThread* java_thread = Threads::first(); java_thread != NULL; java_thread = java_thread->next()) {
1425 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1426 ThreadService::reset_contention_count_stat(java_thread);
1427 } else {
1428 ThreadService::reset_contention_time_stat(java_thread);
1429 }
1430 }
1431 } else {
1432 // reset contention statistics for a given thread
1433 JavaThread* java_thread = find_java_thread_from_id(tid);
1434 if (java_thread == NULL) {
1435 return false;
1436 }
1437
1438 if (type == JMM_STAT_THREAD_CONTENTION_COUNT) {
1439 ThreadService::reset_contention_count_stat(java_thread);
1440 } else {
1441 ThreadService::reset_contention_time_stat(java_thread);
1442 }
1443 }
1444 return true;
1445 break;
1446 }
1447 case JMM_STAT_PEAK_POOL_USAGE: {
1448 jobject o = obj.l;
1449 if (o == NULL) {
1450 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1451 }
1452
1453 oop pool_obj = JNIHandles::resolve(o);
1454 assert(pool_obj->is_instance(), "Should be an instanceOop");
1455 instanceHandle ph(THREAD, (instanceOop) pool_obj);
1456
1457 MemoryPool* pool = MemoryService::get_memory_pool(ph);
1458 if (pool != NULL) {
1459 pool->reset_peak_memory_usage();
1460 return true;
1461 }
1462 break;
1463 }
1464 case JMM_STAT_GC_STAT: {
1465 jobject o = obj.l;
1466 if (o == NULL) {
1467 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1468 }
1469
1470 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(o, CHECK_0);
1471 if (mgr != NULL) {
1472 mgr->reset_gc_stat();
1473 return true;
1474 }
1475 break;
1476 }
1477 default:
1478 assert(0, "Unknown Statistic Type");
1479 }
1480 return false;
1481 JVM_END
1482
1483 // Returns the fast estimate of CPU time consumed by
1484 // a given thread (in nanoseconds).
1485 // If thread_id == 0, return CPU time for the current thread.
1486 JVM_ENTRY(jlong, jmm_GetThreadCpuTime(JNIEnv *env, jlong thread_id))
1487 if (!os::is_thread_cpu_time_supported()) {
1488 return -1;
1489 }
1490
1491 if (thread_id < 0) {
1492 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1493 "Invalid thread ID", -1);
1494 }
1495
1496 JavaThread* java_thread = NULL;
1497 if (thread_id == 0) {
1498 // current thread
1499 return os::current_thread_cpu_time();
1500 } else {
1501 MutexLockerEx ml(Threads_lock);
1502 java_thread = find_java_thread_from_id(thread_id);
1503 if (java_thread != NULL) {
1504 return os::thread_cpu_time((Thread*) java_thread);
1505 }
1506 }
1507 return -1;
1508 JVM_END
1509
1510 // Returns the CPU time consumed by a given thread (in nanoseconds).
1511 // If thread_id == 0, CPU time for the current thread is returned.
1512 // If user_sys_cpu_time = true, user level and system CPU time of
1513 // a given thread is returned; otherwise, only user level CPU time
1514 // is returned.
1515 JVM_ENTRY(jlong, jmm_GetThreadCpuTimeWithKind(JNIEnv *env, jlong thread_id, jboolean user_sys_cpu_time))
1516 if (!os::is_thread_cpu_time_supported()) {
1517 return -1;
1518 }
1519
1520 if (thread_id < 0) {
1521 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1522 "Invalid thread ID", -1);
1523 }
1524
1525 JavaThread* java_thread = NULL;
1526 if (thread_id == 0) {
1527 // current thread
1528 return os::current_thread_cpu_time(user_sys_cpu_time != 0);
1529 } else {
1530 MutexLockerEx ml(Threads_lock);
1531 java_thread = find_java_thread_from_id(thread_id);
1532 if (java_thread != NULL) {
1533 return os::thread_cpu_time((Thread*) java_thread, user_sys_cpu_time != 0);
1534 }
1535 }
1536 return -1;
1537 JVM_END
1538
1539 // Gets an array containing the CPU times consumed by a set of threads
1540 // (in nanoseconds). Each element of the array is the CPU time for the
1541 // thread ID specified in the corresponding entry in the given array
1542 // of thread IDs; or -1 if the thread does not exist or has terminated.
1543 // If user_sys_cpu_time = true, the sum of user level and system CPU time
1544 // for the given thread is returned; otherwise, only user level CPU time
1545 // is returned.
1546 JVM_ENTRY(void, jmm_GetThreadCpuTimesWithKind(JNIEnv *env, jlongArray ids,
1547 jlongArray timeArray,
1548 jboolean user_sys_cpu_time))
1549 // Check if threads is null
1550 if (ids == NULL || timeArray == NULL) {
1551 THROW(vmSymbols::java_lang_NullPointerException());
1552 }
1553
1554 ResourceMark rm(THREAD);
1555 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(ids));
1556 typeArrayHandle ids_ah(THREAD, ta);
1557
1558 typeArrayOop tia = typeArrayOop(JNIHandles::resolve_non_null(timeArray));
1559 typeArrayHandle timeArray_h(THREAD, tia);
1560
1561 // validate the thread id array
1562 validate_thread_id_array(ids_ah, CHECK);
1563
1564 // timeArray must be of the same length as the given array of thread IDs
1565 int num_threads = ids_ah->length();
1566 if (num_threads != timeArray_h->length()) {
1567 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1568 "The length of the given long array does not match the length of "
1569 "the given array of thread IDs");
1570 }
1571
1572 MutexLockerEx ml(Threads_lock);
1573 for (int i = 0; i < num_threads; i++) {
1574 JavaThread* java_thread = find_java_thread_from_id(ids_ah->long_at(i));
1575 if (java_thread != NULL) {
1576 timeArray_h->long_at_put(i, os::thread_cpu_time((Thread*)java_thread,
1577 user_sys_cpu_time != 0));
1578 }
1579 }
1580 JVM_END
1581
1582 // Returns a String array of all VM global flag names
1583 JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
1584 // last flag entry is always NULL, so subtract 1
1585 int nFlags = (int) Flag::numFlags - 1;
1586 // allocate a temp array
1587 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1588 nFlags, CHECK_0);
1589 objArrayHandle flags_ah(THREAD, r);
1590 int num_entries = 0;
1591 for (int i = 0; i < nFlags; i++) {
1592 Flag* flag = &Flag::flags[i];
1593 // Exclude the locked (experimental, diagnostic) flags
1594 if (flag->is_unlocked() || flag->is_unlocker()) {
1595 Handle s = java_lang_String::create_from_str(flag->name, CHECK_0);
1596 flags_ah->obj_at_put(num_entries, s());
1597 num_entries++;
1598 }
1599 }
1600
1601 if (num_entries < nFlags) {
1602 // Return array of right length
1603 objArrayOop res = oopFactory::new_objArray(SystemDictionary::String_klass(), num_entries, CHECK_0);
1604 for(int i = 0; i < num_entries; i++) {
1605 res->obj_at_put(i, flags_ah->obj_at(i));
1606 }
1607 return (jobjectArray)JNIHandles::make_local(env, res);
1608 }
1609
1610 return (jobjectArray)JNIHandles::make_local(env, flags_ah());
1611 JVM_END
1612
1613 // Utility function used by jmm_GetVMGlobals. Returns false if flag type
1614 // can't be determined, true otherwise. If false is returned, then *global
1615 // will be incomplete and invalid.
1616 bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
1617 Handle flag_name;
1618 if (name() == NULL) {
1619 flag_name = java_lang_String::create_from_str(flag->name, CHECK_false);
1620 } else {
1621 flag_name = name;
1622 }
1623 global->name = (jstring)JNIHandles::make_local(env, flag_name());
1624
1625 if (flag->is_bool()) {
1626 global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
1627 global->type = JMM_VMGLOBAL_TYPE_JBOOLEAN;
1628 } else if (flag->is_intx()) {
1629 global->value.j = (jlong)flag->get_intx();
1630 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1631 } else if (flag->is_uintx()) {
1632 global->value.j = (jlong)flag->get_uintx();
1633 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1634 } else if (flag->is_uint64_t()) {
1635 global->value.j = (jlong)flag->get_uint64_t();
1636 global->type = JMM_VMGLOBAL_TYPE_JLONG;
1637 } else if (flag->is_ccstr()) {
1638 Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
1639 global->value.l = (jobject)JNIHandles::make_local(env, str());
1640 global->type = JMM_VMGLOBAL_TYPE_JSTRING;
1641 } else {
1642 global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
1643 return false;
1644 }
1645
1646 global->writeable = flag->is_writeable();
1647 global->external = flag->is_external();
1648 switch (flag->origin) {
1649 case DEFAULT:
1650 global->origin = JMM_VMGLOBAL_ORIGIN_DEFAULT;
1651 break;
1652 case COMMAND_LINE:
1653 global->origin = JMM_VMGLOBAL_ORIGIN_COMMAND_LINE;
1654 break;
1655 case ENVIRON_VAR:
1656 global->origin = JMM_VMGLOBAL_ORIGIN_ENVIRON_VAR;
1657 break;
1658 case CONFIG_FILE:
1659 global->origin = JMM_VMGLOBAL_ORIGIN_CONFIG_FILE;
1660 break;
1661 case MANAGEMENT:
1662 global->origin = JMM_VMGLOBAL_ORIGIN_MANAGEMENT;
1663 break;
1664 case ERGONOMIC:
1665 global->origin = JMM_VMGLOBAL_ORIGIN_ERGONOMIC;
1666 break;
1667 default:
1668 global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
1669 }
1670
1671 return true;
1672 }
1673
1674 // Fill globals array of count length with jmmVMGlobal entries
1675 // specified by names. If names == NULL, fill globals array
1676 // with all Flags. Return value is number of entries
1677 // created in globals.
1678 // If a Flag with a given name in an array element does not
1679 // exist, globals[i].name will be set to NULL.
1680 JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
1681 jobjectArray names,
1682 jmmVMGlobal *globals,
1683 jint count))
1684
1685
1686 if (globals == NULL) {
1687 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1688 }
1689
1690 ResourceMark rm(THREAD);
1691
1692 if (names != NULL) {
1693 // return the requested globals
1694 objArrayOop ta = objArrayOop(JNIHandles::resolve_non_null(names));
1695 objArrayHandle names_ah(THREAD, ta);
1696 // Make sure we have a String array
1697 klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass();
1698 if (element_klass != SystemDictionary::String_klass()) {
1699 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1700 "Array element type is not String class", 0);
1701 }
1702
1703 int names_length = names_ah->length();
1704 int num_entries = 0;
1705 for (int i = 0; i < names_length && i < count; i++) {
1706 oop s = names_ah->obj_at(i);
1707 if (s == NULL) {
1708 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1709 }
1710
1711 Handle sh(THREAD, s);
1712 char* str = java_lang_String::as_utf8_string(s);
1713 Flag* flag = Flag::find_flag(str, strlen(str));
1714 if (flag != NULL &&
1715 add_global_entry(env, sh, &globals[i], flag, THREAD)) {
1716 num_entries++;
1717 } else {
1718 globals[i].name = NULL;
1719 }
1720 }
1721 return num_entries;
1722 } else {
1723 // return all globals if names == NULL
1724
1725 // last flag entry is always NULL, so subtract 1
1726 int nFlags = (int) Flag::numFlags - 1;
1727 Handle null_h;
1728 int num_entries = 0;
1729 for (int i = 0; i < nFlags && num_entries < count; i++) {
1730 Flag* flag = &Flag::flags[i];
1731 // Exclude the locked (diagnostic, experimental) flags
1732 if ((flag->is_unlocked() || flag->is_unlocker()) &&
1733 add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
1734 num_entries++;
1735 }
1736 }
1737 return num_entries;
1738 }
1739 JVM_END
1740
1741 JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value))
1742 ResourceMark rm(THREAD);
1743
1744 oop fn = JNIHandles::resolve_external_guard(flag_name);
1745 if (fn == NULL) {
1746 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
1747 "The flag name cannot be null.");
1748 }
1749 char* name = java_lang_String::as_utf8_string(fn);
1750 Flag* flag = Flag::find_flag(name, strlen(name));
1751 if (flag == NULL) {
1752 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1753 "Flag does not exist.");
1754 }
1755 if (!flag->is_writeable()) {
1756 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
1757 "This flag is not writeable.");
1758 }
1759
1760 bool succeed;
1761 if (flag->is_bool()) {
1762 bool bvalue = (new_value.z == JNI_TRUE ? true : false);
1763 succeed = CommandLineFlags::boolAtPut(name, &bvalue, MANAGEMENT);
1764 } else if (flag->is_intx()) {
1765 intx ivalue = (intx)new_value.j;
1766 succeed = CommandLineFlags::intxAtPut(name, &ivalue, MANAGEMENT);
1767 } else if (flag->is_uintx()) {
1768 uintx uvalue = (uintx)new_value.j;
1769 succeed = CommandLineFlags::uintxAtPut(name, &uvalue, MANAGEMENT);
1770 } else if (flag->is_uint64_t()) {
1771 uint64_t uvalue = (uint64_t)new_value.j;
1772 succeed = CommandLineFlags::uint64_tAtPut(name, &uvalue, MANAGEMENT);
1773 } else if (flag->is_ccstr()) {
1774 oop str = JNIHandles::resolve_external_guard(new_value.l);
1775 if (str == NULL) {
1776 THROW(vmSymbols::java_lang_NullPointerException());
1777 }
1778 ccstr svalue = java_lang_String::as_utf8_string(str);
1779 succeed = CommandLineFlags::ccstrAtPut(name, &svalue, MANAGEMENT);
1780 }
1781 assert(succeed, "Setting flag should succeed");
1782 JVM_END
1783
1784 class ThreadTimesClosure: public ThreadClosure {
1785 private:
1786 objArrayOop _names;
1787 typeArrayOop _times;
1788 int _names_len;
1789 int _times_len;
1790 int _count;
1791
1792 public:
1793 ThreadTimesClosure(objArrayOop names, typeArrayOop times);
1794 virtual void do_thread(Thread* thread);
1795 int count() { return _count; }
1796 };
1797
1798 ThreadTimesClosure::ThreadTimesClosure(objArrayOop names,
1799 typeArrayOop times) {
1800 assert(names != NULL, "names was NULL");
1801 assert(times != NULL, "times was NULL");
1802 _names = names;
1803 _names_len = names->length();
1804 _times = times;
1805 _times_len = times->length();
1806 _count = 0;
1807 }
1808
1809 void ThreadTimesClosure::do_thread(Thread* thread) {
1810 Handle s;
1811 assert(thread != NULL, "thread was NULL");
1812
1813 // exclude externally visible JavaThreads
1814 if (thread->is_Java_thread() && !thread->is_hidden_from_external_view()) {
1815 return;
1816 }
1817
1818 if (_count >= _names_len || _count >= _times_len) {
1819 // skip if the result array is not big enough
1820 return;
1821 }
1822
1823 EXCEPTION_MARK;
1824
1825 assert(thread->name() != NULL, "All threads should have a name");
1826 s = java_lang_String::create_from_str(thread->name(), CHECK);
1827 _names->obj_at_put(_count, s());
1828
1829 _times->long_at_put(_count, os::is_thread_cpu_time_supported() ?
1830 os::thread_cpu_time(thread) : -1);
1831 _count++;
1832 }
1833
1834 // Fills names with VM internal thread names and times with the corresponding
1835 // CPU times. If names or times is NULL, a NullPointerException is thrown.
1836 // If the element type of names is not String, an IllegalArgumentException is
1837 // thrown.
1838 // If an array is not large enough to hold all the entries, only the entries
1839 // that fit will be returned. Return value is the number of VM internal
1840 // threads entries.
1841 JVM_ENTRY(jint, jmm_GetInternalThreadTimes(JNIEnv *env,
1842 jobjectArray names,
1843 jlongArray times))
1844 if (names == NULL || times == NULL) {
1845 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1846 }
1847 objArrayOop na = objArrayOop(JNIHandles::resolve_non_null(names));
1848 objArrayHandle names_ah(THREAD, na);
1849
1850 // Make sure we have a String array
1851 klassOop element_klass = objArrayKlass::cast(names_ah->klass())->element_klass();
1852 if (element_klass != SystemDictionary::String_klass()) {
1853 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1854 "Array element type is not String class", 0);
1855 }
1856
1857 typeArrayOop ta = typeArrayOop(JNIHandles::resolve_non_null(times));
1858 typeArrayHandle times_ah(THREAD, ta);
1859
1860 ThreadTimesClosure ttc(names_ah(), times_ah());
1861 {
1862 MutexLockerEx ml(Threads_lock);
1863 Threads::threads_do(&ttc);
1864 }
1865
1866 return ttc.count();
1867 JVM_END
1868
1869 static Handle find_deadlocks(bool object_monitors_only, TRAPS) {
1870 ResourceMark rm(THREAD);
1871
1872 VM_FindDeadlocks op(!object_monitors_only /* also check concurrent locks? */);
1873 VMThread::execute(&op);
1874
1875 DeadlockCycle* deadlocks = op.result();
1876 if (deadlocks == NULL) {
1877 // no deadlock found and return
1878 return Handle();
1879 }
1880
1881 int num_threads = 0;
1882 DeadlockCycle* cycle;
1883 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1884 num_threads += cycle->num_threads();
1885 }
1886
1887 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NH);
1888 objArrayHandle threads_ah(THREAD, r);
1889
1890 int index = 0;
1891 for (cycle = deadlocks; cycle != NULL; cycle = cycle->next()) {
1892 GrowableArray<JavaThread*>* deadlock_threads = cycle->threads();
1893 int len = deadlock_threads->length();
1894 for (int i = 0; i < len; i++) {
1895 threads_ah->obj_at_put(index, deadlock_threads->at(i)->threadObj());
1896 index++;
1897 }
1898 }
1899 return threads_ah;
1900 }
1901
1902 // Finds cycles of threads that are deadlocked involved in object monitors
1903 // and JSR-166 synchronizers.
1904 // Returns an array of Thread objects which are in deadlock, if any.
1905 // Otherwise, returns NULL.
1906 //
1907 // Input parameter:
1908 // object_monitors_only - if true, only check object monitors
1909 //
1910 JVM_ENTRY(jobjectArray, jmm_FindDeadlockedThreads(JNIEnv *env, jboolean object_monitors_only))
1911 Handle result = find_deadlocks(object_monitors_only != 0, CHECK_0);
1912 return (jobjectArray) JNIHandles::make_local(env, result());
1913 JVM_END
1914
1915 // Finds cycles of threads that are deadlocked on monitor locks
1916 // Returns an array of Thread objects which are in deadlock, if any.
1917 // Otherwise, returns NULL.
1918 JVM_ENTRY(jobjectArray, jmm_FindMonitorDeadlockedThreads(JNIEnv *env))
1919 Handle result = find_deadlocks(true, CHECK_0);
1920 return (jobjectArray) JNIHandles::make_local(env, result());
1921 JVM_END
1922
1923 // Gets the information about GC extension attributes including
1924 // the name of the attribute, its type, and a short description.
1925 //
1926 // Input parameters:
1927 // mgr - GC memory manager
1928 // info - caller allocated array of jmmExtAttributeInfo
1929 // count - number of elements of the info array
1930 //
1931 // Returns the number of GC extension attributes filled in the info array; or
1932 // -1 if info is not big enough
1933 //
1934 JVM_ENTRY(jint, jmm_GetGCExtAttributeInfo(JNIEnv *env, jobject mgr, jmmExtAttributeInfo* info, jint count))
1935 // All GC memory managers have 1 attribute (number of GC threads)
1936 if (count == 0) {
1937 return 0;
1938 }
1939
1940 if (info == NULL) {
1941 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1942 }
1943
1944 info[0].name = "GcThreadCount";
1945 info[0].type = 'I';
1946 info[0].description = "Number of GC threads";
1947 return 1;
1948 JVM_END
1949
1950 // verify the given array is an array of java/lang/management/MemoryUsage objects
1951 // of a given length and return the objArrayOop
1952 static objArrayOop get_memory_usage_objArray(jobjectArray array, int length, TRAPS) {
1953 if (array == NULL) {
1954 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
1955 }
1956
1957 objArrayOop oa = objArrayOop(JNIHandles::resolve_non_null(array));
1958 objArrayHandle array_h(THREAD, oa);
1959
1960 // array must be of the given length
1961 if (length != array_h->length()) {
1962 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1963 "The length of the given MemoryUsage array does not match the number of memory pools.", 0);
1964 }
1965
1966 // check if the element of array is of type MemoryUsage class
1967 klassOop usage_klass = Management::java_lang_management_MemoryUsage_klass(CHECK_0);
1968 klassOop element_klass = objArrayKlass::cast(array_h->klass())->element_klass();
1969 if (element_klass != usage_klass) {
1970 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
1971 "The element type is not MemoryUsage class", 0);
1972 }
1973
1974 return array_h();
1975 }
1976
1977 // Gets the statistics of the last GC of a given GC memory manager.
1978 // Input parameters:
1979 // obj - GarbageCollectorMXBean object
1980 // gc_stat - caller allocated jmmGCStat where:
1981 // a. before_gc_usage - array of MemoryUsage objects
1982 // b. after_gc_usage - array of MemoryUsage objects
1983 // c. gc_ext_attributes_values_size is set to the
1984 // gc_ext_attribute_values array allocated
1985 // d. gc_ext_attribute_values is a caller allocated array of jvalue.
1986 //
1987 // On return,
1988 // gc_index == 0 indicates no GC statistics available
1989 //
1990 // before_gc_usage and after_gc_usage - filled with per memory pool
1991 // before and after GC usage in the same order as the memory pools
1992 // returned by GetMemoryPools for a given GC memory manager.
1993 // num_gc_ext_attributes indicates the number of elements in
1994 // the gc_ext_attribute_values array is filled; or
1995 // -1 if the gc_ext_attributes_values array is not big enough
1996 //
1997 JVM_ENTRY(void, jmm_GetLastGCStat(JNIEnv *env, jobject obj, jmmGCStat *gc_stat))
1998 ResourceMark rm(THREAD);
1999
2000 if (gc_stat->gc_ext_attribute_values_size > 0 && gc_stat->gc_ext_attribute_values == NULL) {
2001 THROW(vmSymbols::java_lang_NullPointerException());
2002 }
2003
2004 // Get the GCMemoryManager
2005 GCMemoryManager* mgr = get_gc_memory_manager_from_jobject(obj, CHECK);
2006
2007 // Make a copy of the last GC statistics
2008 // GC may occur while constructing the last GC information
2009 int num_pools = MemoryService::num_memory_pools();
2010 GCStatInfo* stat = new GCStatInfo(num_pools);
2011 if (mgr->get_last_gc_stat(stat) == 0) {
2012 gc_stat->gc_index = 0;
2013 return;
2014 }
2015
2016 gc_stat->gc_index = stat->gc_index();
2017 gc_stat->start_time = Management::ticks_to_ms(stat->start_time());
2018 gc_stat->end_time = Management::ticks_to_ms(stat->end_time());
2019
2020 // Current implementation does not have GC extension attributes
2021 gc_stat->num_gc_ext_attributes = 0;
2022
2023 // Fill the arrays of MemoryUsage objects with before and after GC
2024 // per pool memory usage
2025 objArrayOop bu = get_memory_usage_objArray(gc_stat->usage_before_gc,
2026 num_pools,
2027 CHECK);
2028 objArrayHandle usage_before_gc_ah(THREAD, bu);
2029
2030 objArrayOop au = get_memory_usage_objArray(gc_stat->usage_after_gc,
2031 num_pools,
2032 CHECK);
2033 objArrayHandle usage_after_gc_ah(THREAD, au);
2034
2035 for (int i = 0; i < num_pools; i++) {
2036 Handle before_usage = MemoryService::create_MemoryUsage_obj(stat->before_gc_usage_for_pool(i), CHECK);
2037 Handle after_usage;
2038
2039 MemoryUsage u = stat->after_gc_usage_for_pool(i);
2040 if (u.max_size() == 0 && u.used() > 0) {
2041 // If max size == 0, this pool is a survivor space.
2042 // Set max size = -1 since the pools will be swapped after GC.
2043 MemoryUsage usage(u.init_size(), u.used(), u.committed(), (size_t)-1);
2044 after_usage = MemoryService::create_MemoryUsage_obj(usage, CHECK);
2045 } else {
2046 after_usage = MemoryService::create_MemoryUsage_obj(stat->after_gc_usage_for_pool(i), CHECK);
2047 }
2048 usage_before_gc_ah->obj_at_put(i, before_usage());
2049 usage_after_gc_ah->obj_at_put(i, after_usage());
2050 }
2051
2052 if (gc_stat->gc_ext_attribute_values_size > 0) {
2053 // Current implementation only has 1 attribute (number of GC threads)
2054 // The type is 'I'
2055 gc_stat->gc_ext_attribute_values[0].i = mgr->num_gc_threads();
2056 }
2057 JVM_END
2058
2059 // Dump heap - Returns 0 if succeeds.
2060 JVM_ENTRY(jint, jmm_DumpHeap0(JNIEnv *env, jstring outputfile, jboolean live))
2061 #ifndef SERVICES_KERNEL
2062 ResourceMark rm(THREAD);
2063 oop on = JNIHandles::resolve_external_guard(outputfile);
2064 if (on == NULL) {
2065 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
2066 "Output file name cannot be null.", -1);
2067 }
2068 char* name = java_lang_String::as_utf8_string(on);
2069 if (name == NULL) {
2070 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
2071 "Output file name cannot be null.", -1);
2072 }
2073 HeapDumper dumper(live ? true : false);
2074 if (dumper.dump(name) != 0) {
2075 const char* errmsg = dumper.error_as_C_string();
2076 THROW_MSG_(vmSymbols::java_io_IOException(), errmsg, -1);
2077 }
2078 return 0;
2079 #else // SERVICES_KERNEL
2080 return -1;
2081 #endif // SERVICES_KERNEL
2082 JVM_END
2083
2084 jlong Management::ticks_to_ms(jlong ticks) {
2085 assert(os::elapsed_frequency() > 0, "Must be non-zero");
2086 return (jlong)(((double)ticks / (double)os::elapsed_frequency())
2087 * (double)1000.0);
2088 }
2089
2090 const struct jmmInterface_1_ jmm_interface = {
2091 NULL,
2092 NULL,
2093 jmm_GetVersion,
2094 jmm_GetOptionalSupport,
2095 jmm_GetInputArguments,
2096 jmm_GetThreadInfo,
2097 jmm_GetInputArgumentArray,
2098 jmm_GetMemoryPools,
2099 jmm_GetMemoryManagers,
2100 jmm_GetMemoryPoolUsage,
2101 jmm_GetPeakMemoryPoolUsage,
2102 jmm_GetThreadAllocatedMemory,
2103 jmm_GetMemoryUsage,
2104 jmm_GetLongAttribute,
2105 jmm_GetBoolAttribute,
2106 jmm_SetBoolAttribute,
2107 jmm_GetLongAttributes,
2108 jmm_FindMonitorDeadlockedThreads,
2109 jmm_GetThreadCpuTime,
2110 jmm_GetVMGlobalNames,
2111 jmm_GetVMGlobals,
2112 jmm_GetInternalThreadTimes,
2113 jmm_ResetStatistic,
2114 jmm_SetPoolSensor,
2115 jmm_SetPoolThreshold,
2116 jmm_GetPoolCollectionUsage,
2117 jmm_GetGCExtAttributeInfo,
2118 jmm_GetLastGCStat,
2119 jmm_GetThreadCpuTimeWithKind,
2120 jmm_GetThreadCpuTimesWithKind,
2121 jmm_DumpHeap0,
2122 jmm_FindDeadlockedThreads,
2123 jmm_SetVMGlobal,
2124 NULL,
2125 jmm_DumpThreads
2126 };
2127
2128 void* Management::get_jmm_interface(int version) {
2129 if (version == JMM_VERSION_1_0) {
2130 return (void*) &jmm_interface;
2131 }
2132 return NULL;
2133 }