1 /*
2 * Copyright (c) 2012, 2017, 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 // A ClassLoaderData identifies the full set of class types that a class
26 // loader's name resolution strategy produces for a given configuration of the
27 // class loader.
28 // Class types in the ClassLoaderData may be defined by from class file binaries
29 // provided by the class loader, or from other class loader it interacts with
30 // according to its name resolution strategy.
31 //
32 // Class loaders that implement a deterministic name resolution strategy
33 // (including with respect to their delegation behavior), such as the boot, the
34 // platform, and the system loaders of the JDK's built-in class loader
35 // hierarchy, always produce the same linkset for a given configuration.
36 //
37 // ClassLoaderData carries information related to a linkset (e.g.,
38 // metaspace holding its klass definitions).
39 // The System Dictionary and related data structures (e.g., placeholder table,
40 // loader constraints table) as well as the runtime representation of classes
41 // only reference ClassLoaderData.
42 //
43 // Instances of java.lang.ClassLoader holds a pointer to a ClassLoaderData that
44 // that represent the loader's "linking domain" in the JVM.
45 //
46 // The bootstrap loader (represented by NULL) also has a ClassLoaderData,
47 // the singleton class the_null_class_loader_data().
48
49 #include "precompiled.hpp"
50 #include "classfile/classLoaderData.hpp"
51 #include "classfile/classLoaderData.inline.hpp"
52 #include "classfile/javaClasses.hpp"
53 #include "classfile/metadataOnStackMark.hpp"
54 #include "classfile/moduleEntry.hpp"
55 #include "classfile/packageEntry.hpp"
56 #include "classfile/systemDictionary.hpp"
57 #include "code/codeCache.hpp"
58 #include "gc/shared/gcLocker.hpp"
59 #include "logging/log.hpp"
60 #include "logging/logStream.hpp"
61 #include "memory/metadataFactory.hpp"
62 #include "memory/metaspaceShared.hpp"
63 #include "memory/oopFactory.hpp"
64 #include "memory/resourceArea.hpp"
65 #include "oops/objArrayOop.inline.hpp"
66 #include "oops/oop.inline.hpp"
67 #include "runtime/atomic.hpp"
68 #include "runtime/javaCalls.hpp"
69 #include "runtime/jniHandles.hpp"
70 #include "runtime/mutex.hpp"
71 #include "runtime/orderAccess.hpp"
72 #include "runtime/safepoint.hpp"
73 #include "runtime/synchronizer.hpp"
74 #include "utilities/growableArray.hpp"
75 #include "utilities/macros.hpp"
76 #include "utilities/ostream.hpp"
77 #if INCLUDE_TRACE
78 #include "trace/tracing.hpp"
79 #endif
80
81 // helper function to avoid in-line casts
82 template <typename T> static T* load_ptr_acquire(T* volatile *p) {
83 return static_cast<T*>(OrderAccess::load_ptr_acquire(p));
84 }
85
86 ClassLoaderData * ClassLoaderData::_the_null_class_loader_data = NULL;
87
88 ClassLoaderData::ClassLoaderData(Handle h_class_loader, bool is_anonymous, Dependencies dependencies) :
89 _class_loader(h_class_loader()),
90 _is_anonymous(is_anonymous),
91 // An anonymous class loader data doesn't have anything to keep
92 // it from being unloaded during parsing of the anonymous class.
93 // The null-class-loader should always be kept alive.
94 _keep_alive((is_anonymous || h_class_loader.is_null()) ? 1 : 0),
95 _metaspace(NULL), _unloading(false), _klasses(NULL),
96 _modules(NULL), _packages(NULL),
97 _claimed(0), _jmethod_ids(NULL), _handles(), _deallocate_list(NULL),
98 _next(NULL), _dependencies(dependencies),
99 _metaspace_lock(new Mutex(Monitor::leaf+1, "Metaspace allocation lock", true,
100 Monitor::_safepoint_check_never)) {
101
102 // A ClassLoaderData created solely for an anonymous class should never have a
103 // ModuleEntryTable or PackageEntryTable created for it. The defining package
104 // and module for an anonymous class will be found in its host class.
105 if (!is_anonymous) {
106 _packages = new PackageEntryTable(PackageEntryTable::_packagetable_entry_size);
107 if (h_class_loader.is_null()) {
108 // Create unnamed module for boot loader
109 _unnamed_module = ModuleEntry::create_boot_unnamed_module(this);
110 } else {
111 // Create unnamed module for all other loaders
112 _unnamed_module = ModuleEntry::create_unnamed_module(this);
113 }
114 } else {
115 _unnamed_module = NULL;
116 }
117 TRACE_INIT_ID(this);
118 }
119
120 void ClassLoaderData::init_dependencies(TRAPS) {
121 assert(!Universe::is_fully_initialized(), "should only be called when initializing");
122 assert(is_the_null_class_loader_data(), "should only call this for the null class loader");
123 _dependencies.init(CHECK);
124 }
125
126 void ClassLoaderData::Dependencies::init(TRAPS) {
127 // Create empty dependencies array to add to. CMS requires this to be
128 // an oop so that it can track additions via card marks. We think.
129 _list_head = oopFactory::new_objectArray(2, CHECK);
130 }
131
132 ClassLoaderData::ChunkedHandleList::~ChunkedHandleList() {
133 Chunk* c = _head;
134 while (c != NULL) {
135 Chunk* next = c->_next;
136 delete c;
137 c = next;
138 }
139 }
140
141 oop* ClassLoaderData::ChunkedHandleList::add(oop o) {
142 if (_head == NULL || _head->_size == Chunk::CAPACITY) {
143 Chunk* next = new Chunk(_head);
144 OrderAccess::release_store_ptr(&_head, next);
145 }
146 oop* handle = &_head->_data[_head->_size];
147 *handle = o;
148 OrderAccess::release_store(&_head->_size, _head->_size + 1);
149 return handle;
150 }
151
152 inline void ClassLoaderData::ChunkedHandleList::oops_do_chunk(OopClosure* f, Chunk* c, const juint size) {
153 for (juint i = 0; i < size; i++) {
154 if (c->_data[i] != NULL) {
155 f->do_oop(&c->_data[i]);
156 }
157 }
158 }
159
160 void ClassLoaderData::ChunkedHandleList::oops_do(OopClosure* f) {
161 Chunk* head = (Chunk*) OrderAccess::load_ptr_acquire(&_head);
162 if (head != NULL) {
163 // Must be careful when reading size of head
164 oops_do_chunk(f, head, OrderAccess::load_acquire(&head->_size));
165 for (Chunk* c = head->_next; c != NULL; c = c->_next) {
166 oops_do_chunk(f, c, c->_size);
167 }
168 }
169 }
170
171 #ifdef ASSERT
172 class VerifyContainsOopClosure : public OopClosure {
173 oop* _target;
174 bool _found;
175
176 public:
177 VerifyContainsOopClosure(oop* target) : _target(target), _found(false) {}
178
179 void do_oop(oop* p) {
180 if (p == _target) {
181 _found = true;
182 }
183 }
184
185 void do_oop(narrowOop* p) {
186 // The ChunkedHandleList should not contain any narrowOop
187 ShouldNotReachHere();
188 }
189
190 bool found() const {
191 return _found;
192 }
193 };
194
195 bool ClassLoaderData::ChunkedHandleList::contains(oop* p) {
196 VerifyContainsOopClosure cl(p);
197 oops_do(&cl);
198 return cl.found();
199 }
200 #endif
201
202 bool ClassLoaderData::claim() {
203 if (_claimed == 1) {
204 return false;
205 }
206
207 return (int) Atomic::cmpxchg(1, &_claimed, 0) == 0;
208 }
209
210 // Anonymous classes have their own ClassLoaderData that is marked to keep alive
211 // while the class is being parsed, and if the class appears on the module fixup list.
212 // Due to the uniqueness that no other class shares the anonymous class' name or
213 // ClassLoaderData, no other non-GC thread has knowledge of the anonymous class while
214 // it is being defined, therefore _keep_alive is not volatile or atomic.
215 void ClassLoaderData::inc_keep_alive() {
216 if (is_anonymous()) {
217 assert(_keep_alive >= 0, "Invalid keep alive increment count");
218 _keep_alive++;
219 }
220 }
221
222 void ClassLoaderData::dec_keep_alive() {
223 if (is_anonymous()) {
224 assert(_keep_alive > 0, "Invalid keep alive decrement count");
225 _keep_alive--;
226 }
227 }
228
229 void ClassLoaderData::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) {
230 if (must_claim && !claim()) {
231 return;
232 }
233
234 f->do_oop(&_class_loader);
235 _dependencies.oops_do(f);
236
237 _handles.oops_do(f);
238
239 if (klass_closure != NULL) {
240 classes_do(klass_closure);
241 }
242 }
243
244 void ClassLoaderData::Dependencies::oops_do(OopClosure* f) {
245 f->do_oop((oop*)&_list_head);
246 }
247
248 void ClassLoaderData::classes_do(KlassClosure* klass_closure) {
249 // Lock-free access requires load_ptr_acquire
250 for (Klass* k = load_ptr_acquire(&_klasses); k != NULL; k = k->next_link()) {
251 klass_closure->do_klass(k);
252 assert(k != k->next_link(), "no loops!");
253 }
254 }
255
256 void ClassLoaderData::classes_do(void f(Klass * const)) {
257 // Lock-free access requires load_ptr_acquire
258 for (Klass* k = load_ptr_acquire(&_klasses); k != NULL; k = k->next_link()) {
259 f(k);
260 assert(k != k->next_link(), "no loops!");
261 }
262 }
263
264 void ClassLoaderData::methods_do(void f(Method*)) {
265 // Lock-free access requires load_ptr_acquire
266 for (Klass* k = load_ptr_acquire(&_klasses); k != NULL; k = k->next_link()) {
267 if (k->is_instance_klass() && InstanceKlass::cast(k)->is_loaded()) {
268 InstanceKlass::cast(k)->methods_do(f);
269 }
270 }
271 }
272
273 void ClassLoaderData::loaded_classes_do(KlassClosure* klass_closure) {
274 // Lock-free access requires load_ptr_acquire
275 for (Klass* k = load_ptr_acquire(&_klasses); k != NULL; k = k->next_link()) {
276 // Do not filter ArrayKlass oops here...
277 if (k->is_array_klass() || (k->is_instance_klass() && InstanceKlass::cast(k)->is_loaded())) {
278 klass_closure->do_klass(k);
279 }
280 }
281 }
282
283 void ClassLoaderData::classes_do(void f(InstanceKlass*)) {
284 // Lock-free access requires load_ptr_acquire
285 for (Klass* k = load_ptr_acquire(&_klasses); k != NULL; k = k->next_link()) {
286 if (k->is_instance_klass()) {
287 f(InstanceKlass::cast(k));
288 }
289 assert(k != k->next_link(), "no loops!");
290 }
291 }
292
293 void ClassLoaderData::modules_do(void f(ModuleEntry*)) {
294 assert_locked_or_safepoint(Module_lock);
295 if (_unnamed_module != NULL) {
296 f(_unnamed_module);
297 }
298 if (_modules != NULL) {
299 for (int i = 0; i < _modules->table_size(); i++) {
300 for (ModuleEntry* entry = _modules->bucket(i);
301 entry != NULL;
302 entry = entry->next()) {
303 f(entry);
304 }
305 }
306 }
307 }
308
309 void ClassLoaderData::packages_do(void f(PackageEntry*)) {
310 assert_locked_or_safepoint(Module_lock);
311 if (_packages != NULL) {
312 for (int i = 0; i < _packages->table_size(); i++) {
313 for (PackageEntry* entry = _packages->bucket(i);
314 entry != NULL;
315 entry = entry->next()) {
316 f(entry);
317 }
318 }
319 }
320 }
321
322 void ClassLoaderData::record_dependency(const Klass* k, TRAPS) {
323 assert(k != NULL, "invariant");
324
325 ClassLoaderData * const from_cld = this;
326 ClassLoaderData * const to_cld = k->class_loader_data();
327
328 // Dependency to the null class loader data doesn't need to be recorded
329 // because the null class loader data never goes away.
330 if (to_cld->is_the_null_class_loader_data()) {
331 return;
332 }
333
334 oop to;
335 if (to_cld->is_anonymous()) {
336 // Anonymous class dependencies are through the mirror.
337 to = k->java_mirror();
338 } else {
339 to = to_cld->class_loader();
340
341 // If from_cld is anonymous, even if it's class_loader is a parent of 'to'
342 // we still have to add it. The class_loader won't keep from_cld alive.
343 if (!from_cld->is_anonymous()) {
344 // Check that this dependency isn't from the same or parent class_loader
345 oop from = from_cld->class_loader();
346
347 oop curr = from;
348 while (curr != NULL) {
349 if (curr == to) {
350 return; // this class loader is in the parent list, no need to add it.
351 }
352 curr = java_lang_ClassLoader::parent(curr);
353 }
354 }
355 }
356
357 // It's a dependency we won't find through GC, add it. This is relatively rare
358 // Must handle over GC point.
359 Handle dependency(THREAD, to);
360 from_cld->_dependencies.add(dependency, CHECK);
361 }
362
363
364 void ClassLoaderData::Dependencies::add(Handle dependency, TRAPS) {
365 // Check first if this dependency is already in the list.
366 // Save a pointer to the last to add to under the lock.
367 objArrayOop ok = _list_head;
368 objArrayOop last = NULL;
369 while (ok != NULL) {
370 last = ok;
371 if (ok->obj_at(0) == dependency()) {
372 // Don't need to add it
373 return;
374 }
375 ok = (objArrayOop)ok->obj_at(1);
376 }
377
378 // Must handle over GC points
379 assert (last != NULL, "dependencies should be initialized");
380 objArrayHandle last_handle(THREAD, last);
381
382 // Create a new dependency node with fields for (class_loader or mirror, next)
383 objArrayOop deps = oopFactory::new_objectArray(2, CHECK);
384 deps->obj_at_put(0, dependency());
385
386 // Must handle over GC points
387 objArrayHandle new_dependency(THREAD, deps);
388
389 // Add the dependency under lock
390 locked_add(last_handle, new_dependency, THREAD);
391 }
392
393 void ClassLoaderData::Dependencies::locked_add(objArrayHandle last_handle,
394 objArrayHandle new_dependency,
395 Thread* THREAD) {
396
397 // Have to lock and put the new dependency on the end of the dependency
398 // array so the card mark for CMS sees that this dependency is new.
399 // Can probably do this lock free with some effort.
400 ObjectLocker ol(Handle(THREAD, _list_head), THREAD);
401
402 oop loader_or_mirror = new_dependency->obj_at(0);
403
404 // Since the dependencies are only added, add to the end.
405 objArrayOop end = last_handle();
406 objArrayOop last = NULL;
407 while (end != NULL) {
408 last = end;
409 // check again if another thread added it to the end.
410 if (end->obj_at(0) == loader_or_mirror) {
411 // Don't need to add it
412 return;
413 }
414 end = (objArrayOop)end->obj_at(1);
415 }
416 assert (last != NULL, "dependencies should be initialized");
417 // fill in the first element with the oop in new_dependency.
418 if (last->obj_at(0) == NULL) {
419 last->obj_at_put(0, new_dependency->obj_at(0));
420 } else {
421 last->obj_at_put(1, new_dependency());
422 }
423 }
424
425 void ClassLoaderDataGraph::clear_claimed_marks() {
426 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
427 cld->clear_claimed();
428 }
429 }
430
431 void ClassLoaderData::add_class(Klass* k, bool publicize /* true */) {
432 {
433 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
434 Klass* old_value = _klasses;
435 k->set_next_link(old_value);
436 // Link the new item into the list, making sure the linked class is stable
437 // since the list can be walked without a lock
438 OrderAccess::release_store_ptr(&_klasses, k);
439 }
440
441 if (publicize && k->class_loader_data() != NULL) {
442 ResourceMark rm;
443 log_trace(class, loader, data)("Adding k: " PTR_FORMAT " %s to CLD: "
444 PTR_FORMAT " loader: " PTR_FORMAT " %s",
445 p2i(k),
446 k->external_name(),
447 p2i(k->class_loader_data()),
448 p2i((void *)k->class_loader()),
449 loader_name());
450 }
451 }
452
453 // Remove a klass from the _klasses list for scratch_class during redefinition
454 // or parsed class in the case of an error.
455 void ClassLoaderData::remove_class(Klass* scratch_class) {
456 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
457 Klass* prev = NULL;
458 for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
459 if (k == scratch_class) {
460 if (prev == NULL) {
461 _klasses = k->next_link();
462 } else {
463 Klass* next = k->next_link();
464 prev->set_next_link(next);
465 }
466 return;
467 }
468 prev = k;
469 assert(k != k->next_link(), "no loops!");
470 }
471 ShouldNotReachHere(); // should have found this class!!
472 }
473
474 void ClassLoaderData::unload() {
475 _unloading = true;
476
477 // Tell serviceability tools these classes are unloading
478 classes_do(InstanceKlass::notify_unload_class);
479
480 LogTarget(Debug, class, loader, data) lt;
481 if (lt.is_enabled()) {
482 ResourceMark rm;
483 LogStream ls(lt);
484 ls.print(": unload loader data " INTPTR_FORMAT, p2i(this));
485 ls.print(" for instance " INTPTR_FORMAT " of %s", p2i((void *)class_loader()),
486 loader_name());
487 if (is_anonymous()) {
488 ls.print(" for anonymous class " INTPTR_FORMAT " ", p2i(_klasses));
489 }
490 ls.cr();
491 }
492
493 // In some rare cases items added to this list will not be freed elsewhere.
494 // To keep it simple, just free everything in it here.
495 free_deallocate_list();
496 }
497
498 ModuleEntryTable* ClassLoaderData::modules() {
499 // Lazily create the module entry table at first request.
500 // Lock-free access requires load_ptr_acquire.
501 ModuleEntryTable* modules = load_ptr_acquire(&_modules);
502 if (modules == NULL) {
503 MutexLocker m1(Module_lock);
504 // Check if _modules got allocated while we were waiting for this lock.
505 if ((modules = _modules) == NULL) {
506 modules = new ModuleEntryTable(ModuleEntryTable::_moduletable_entry_size);
507
508 {
509 MutexLockerEx m1(metaspace_lock(), Mutex::_no_safepoint_check_flag);
510 // Ensure _modules is stable, since it is examined without a lock
511 OrderAccess::release_store_ptr(&_modules, modules);
512 }
513 }
514 }
515 return modules;
516 }
517
518 oop ClassLoaderData::keep_alive_object() const {
519 assert_locked_or_safepoint(_metaspace_lock);
520 assert(!keep_alive(), "Don't use with CLDs that are artificially kept alive");
521 return is_anonymous() ? _klasses->java_mirror() : class_loader();
522 }
523
524 bool ClassLoaderData::is_alive(BoolObjectClosure* is_alive_closure) const {
525 bool alive = keep_alive() // null class loader and incomplete anonymous klasses.
526 || is_alive_closure->do_object_b(keep_alive_object());
527
528 return alive;
529 }
530
531 ClassLoaderData::~ClassLoaderData() {
532 // Release C heap structures for all the classes.
533 classes_do(InstanceKlass::release_C_heap_structures);
534
535 // Release C heap allocated hashtable for all the packages.
536 if (_packages != NULL) {
537 // Destroy the table itself
538 delete _packages;
539 _packages = NULL;
540 }
541
542 // Release C heap allocated hashtable for all the modules.
543 if (_modules != NULL) {
544 // Destroy the table itself
545 delete _modules;
546 _modules = NULL;
547 }
548
549 if (_unnamed_module != NULL) {
550 _unnamed_module->delete_unnamed_module();
551 _unnamed_module = NULL;
552 }
553
554 // release the metaspace
555 Metaspace *m = _metaspace;
556 if (m != NULL) {
557 _metaspace = NULL;
558 delete m;
559 }
560 // Clear all the JNI handles for methods
561 // These aren't deallocated and are going to look like a leak, but that's
562 // needed because we can't really get rid of jmethodIDs because we don't
563 // know when native code is going to stop using them. The spec says that
564 // they're "invalid" but existing programs likely rely on their being
565 // NULL after class unloading.
566 if (_jmethod_ids != NULL) {
567 Method::clear_jmethod_ids(this);
568 }
569 // Delete lock
570 delete _metaspace_lock;
571
572 // Delete free list
573 if (_deallocate_list != NULL) {
574 delete _deallocate_list;
575 }
576 }
577
578 // Returns true if this class loader data is for the system class loader.
579 bool ClassLoaderData::is_system_class_loader_data() const {
580 return SystemDictionary::is_system_class_loader(class_loader());
581 }
582
583 // Returns true if this class loader data is for the platform class loader.
584 bool ClassLoaderData::is_platform_class_loader_data() const {
585 return SystemDictionary::is_platform_class_loader(class_loader());
586 }
587
588 // Returns true if this class loader data is one of the 3 builtin
589 // (boot, application/system or platform) class loaders. Note, the
590 // builtin loaders are not freed by a GC.
591 bool ClassLoaderData::is_builtin_class_loader_data() const {
592 return (is_the_null_class_loader_data() ||
593 SystemDictionary::is_system_class_loader(class_loader()) ||
594 SystemDictionary::is_platform_class_loader(class_loader()));
595 }
596
597 Metaspace* ClassLoaderData::metaspace_non_null() {
598 assert(!DumpSharedSpaces, "wrong metaspace!");
599 // If the metaspace has not been allocated, create a new one. Might want
600 // to create smaller arena for Reflection class loaders also.
601 // The reason for the delayed allocation is because some class loaders are
602 // simply for delegating with no metadata of their own.
603 // Lock-free access requires load_ptr_acquire.
604 Metaspace* metaspace = load_ptr_acquire(&_metaspace);
605 if (metaspace == NULL) {
606 MutexLockerEx ml(_metaspace_lock, Mutex::_no_safepoint_check_flag);
607 // Check if _metaspace got allocated while we were waiting for this lock.
608 if ((metaspace = _metaspace) == NULL) {
609 if (this == the_null_class_loader_data()) {
610 assert (class_loader() == NULL, "Must be");
611 metaspace = new Metaspace(_metaspace_lock, Metaspace::BootMetaspaceType);
612 } else if (is_anonymous()) {
613 if (class_loader() != NULL) {
614 log_trace(class, loader, data)("is_anonymous: %s", class_loader()->klass()->internal_name());
615 }
616 metaspace = new Metaspace(_metaspace_lock, Metaspace::AnonymousMetaspaceType);
617 } else if (class_loader()->is_a(SystemDictionary::reflect_DelegatingClassLoader_klass())) {
618 if (class_loader() != NULL) {
619 log_trace(class, loader, data)("is_reflection: %s", class_loader()->klass()->internal_name());
620 }
621 metaspace = new Metaspace(_metaspace_lock, Metaspace::ReflectionMetaspaceType);
622 } else {
623 metaspace = new Metaspace(_metaspace_lock, Metaspace::StandardMetaspaceType);
624 }
625 // Ensure _metaspace is stable, since it is examined without a lock
626 OrderAccess::release_store_ptr(&_metaspace, metaspace);
627 }
628 }
629 return metaspace;
630 }
631
632 jobject ClassLoaderData::add_handle(Handle h) {
633 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
634 return (jobject) _handles.add(h());
635 }
636
637 void ClassLoaderData::remove_handle_unsafe(jobject h) {
638 assert(_handles.contains((oop*) h), "Got unexpected handle " PTR_FORMAT, p2i((oop*) h));
639 *((oop*) h) = NULL;
640 }
641
642 // Add this metadata pointer to be freed when it's safe. This is only during
643 // class unloading because Handles might point to this metadata field.
644 void ClassLoaderData::add_to_deallocate_list(Metadata* m) {
645 // Metadata in shared region isn't deleted.
646 if (!m->is_shared()) {
647 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
648 if (_deallocate_list == NULL) {
649 _deallocate_list = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(100, true);
650 }
651 _deallocate_list->append_if_missing(m);
652 }
653 }
654
655 // Deallocate free metadata on the free list. How useful the PermGen was!
656 void ClassLoaderData::free_deallocate_list() {
657 // Don't need lock, at safepoint
658 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
659 if (_deallocate_list == NULL) {
660 return;
661 }
662 // Go backwards because this removes entries that are freed.
663 for (int i = _deallocate_list->length() - 1; i >= 0; i--) {
664 Metadata* m = _deallocate_list->at(i);
665 if (!m->on_stack()) {
666 _deallocate_list->remove_at(i);
667 // There are only three types of metadata that we deallocate directly.
668 // Cast them so they can be used by the template function.
669 if (m->is_method()) {
670 MetadataFactory::free_metadata(this, (Method*)m);
671 } else if (m->is_constantPool()) {
672 MetadataFactory::free_metadata(this, (ConstantPool*)m);
673 } else if (m->is_klass()) {
674 MetadataFactory::free_metadata(this, (InstanceKlass*)m);
675 } else {
676 ShouldNotReachHere();
677 }
678 } else {
679 // Metadata is alive.
680 // If scratch_class is on stack then it shouldn't be on this list!
681 assert(!m->is_klass() || !((InstanceKlass*)m)->is_scratch_class(),
682 "scratch classes on this list should be dead");
683 // Also should assert that other metadata on the list was found in handles.
684 }
685 }
686 }
687
688 // These anonymous class loaders are to contain classes used for JSR292
689 ClassLoaderData* ClassLoaderData::anonymous_class_loader_data(oop loader, TRAPS) {
690 // Add a new class loader data to the graph.
691 Handle lh(THREAD, loader);
692 return ClassLoaderDataGraph::add(lh, true, THREAD);
693 }
694
695 const char* ClassLoaderData::loader_name() {
696 // Handles null class loader
697 return SystemDictionary::loader_name(class_loader());
698 }
699
700 #ifndef PRODUCT
701 // Define to dump klasses
702 #undef CLD_DUMP_KLASSES
703
704 void ClassLoaderData::dump(outputStream * const out) {
705 out->print("ClassLoaderData CLD: " PTR_FORMAT ", loader: " PTR_FORMAT ", loader_klass: " PTR_FORMAT " %s {",
706 p2i(this), p2i((void *)class_loader()),
707 p2i(class_loader() != NULL ? class_loader()->klass() : NULL), loader_name());
708 if (claimed()) out->print(" claimed ");
709 if (is_unloading()) out->print(" unloading ");
710 out->cr();
711 if (metaspace_or_null() != NULL) {
712 out->print_cr("metaspace: " INTPTR_FORMAT, p2i(metaspace_or_null()));
713 metaspace_or_null()->dump(out);
714 } else {
715 out->print_cr("metaspace: NULL");
716 }
717
718 #ifdef CLD_DUMP_KLASSES
719 if (Verbose) {
720 Klass* k = _klasses;
721 while (k != NULL) {
722 out->print_cr("klass " PTR_FORMAT ", %s, CT: %d, MUT: %d", k, k->name()->as_C_string(),
723 k->has_modified_oops(), k->has_accumulated_modified_oops());
724 assert(k != k->next_link(), "no loops!");
725 k = k->next_link();
726 }
727 }
728 #endif // CLD_DUMP_KLASSES
729 #undef CLD_DUMP_KLASSES
730 if (_jmethod_ids != NULL) {
731 Method::print_jmethod_ids(this, out);
732 }
733 out->print_cr("}");
734 }
735 #endif // PRODUCT
736
737 void ClassLoaderData::verify() {
738 assert_locked_or_safepoint(_metaspace_lock);
739 oop cl = class_loader();
740
741 guarantee(this == class_loader_data(cl) || is_anonymous(), "Must be the same");
742 guarantee(cl != NULL || this == ClassLoaderData::the_null_class_loader_data() || is_anonymous(), "must be");
743
744 // Verify the integrity of the allocated space.
745 if (metaspace_or_null() != NULL) {
746 metaspace_or_null()->verify();
747 }
748
749 for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
750 guarantee(k->class_loader_data() == this, "Must be the same");
751 k->verify();
752 assert(k != k->next_link(), "no loops!");
753 }
754 }
755
756 bool ClassLoaderData::contains_klass(Klass* klass) {
757 // Lock-free access requires load_ptr_acquire
758 for (Klass* k = load_ptr_acquire(&_klasses); k != NULL; k = k->next_link()) {
759 if (k == klass) return true;
760 }
761 return false;
762 }
763
764
765 // GC root of class loader data created.
766 ClassLoaderData* ClassLoaderDataGraph::_head = NULL;
767 ClassLoaderData* ClassLoaderDataGraph::_unloading = NULL;
768 ClassLoaderData* ClassLoaderDataGraph::_saved_unloading = NULL;
769 ClassLoaderData* ClassLoaderDataGraph::_saved_head = NULL;
770
771 bool ClassLoaderDataGraph::_should_purge = false;
772 bool ClassLoaderDataGraph::_metaspace_oom = false;
773
774 // Add a new class loader data node to the list. Assign the newly created
775 // ClassLoaderData into the java/lang/ClassLoader object as a hidden field
776 ClassLoaderData* ClassLoaderDataGraph::add(Handle loader, bool is_anonymous, TRAPS) {
777 // We need to allocate all the oops for the ClassLoaderData before allocating the
778 // actual ClassLoaderData object.
779 ClassLoaderData::Dependencies dependencies(CHECK_NULL);
780
781 NoSafepointVerifier no_safepoints; // we mustn't GC until we've installed the
782 // ClassLoaderData in the graph since the CLD
783 // contains unhandled oops
784
785 ClassLoaderData* cld = new ClassLoaderData(loader, is_anonymous, dependencies);
786
787
788 if (!is_anonymous) {
789 ClassLoaderData** cld_addr = java_lang_ClassLoader::loader_data_addr(loader());
790 // First, Atomically set it
791 ClassLoaderData* old = (ClassLoaderData*) Atomic::cmpxchg_ptr(cld, cld_addr, NULL);
792 if (old != NULL) {
793 delete cld;
794 // Returns the data.
795 return old;
796 }
797 }
798
799 // We won the race, and therefore the task of adding the data to the list of
800 // class loader data
801 ClassLoaderData** list_head = &_head;
802 ClassLoaderData* next = _head;
803
804 do {
805 cld->set_next(next);
806 ClassLoaderData* exchanged = (ClassLoaderData*)Atomic::cmpxchg_ptr(cld, list_head, next);
807 if (exchanged == next) {
808 LogTarget(Debug, class, loader, data) lt;
809 if (lt.is_enabled()) {
810 PauseNoSafepointVerifier pnsv(&no_safepoints); // Need safe points for JavaCalls::call_virtual
811 LogStream ls(lt);
812 print_creation(&ls, loader, cld, CHECK_NULL);
813 }
814 return cld;
815 }
816 next = exchanged;
817 } while (true);
818 }
819
820 void ClassLoaderDataGraph::print_creation(outputStream* out, Handle loader, ClassLoaderData* cld, TRAPS) {
821 Handle string;
822 if (loader.not_null()) {
823 // Include the result of loader.toString() in the output. This allows
824 // the user of the log to identify the class loader instance.
825 JavaValue result(T_OBJECT);
826 Klass* spec_klass = SystemDictionary::ClassLoader_klass();
827 JavaCalls::call_virtual(&result,
828 loader,
829 spec_klass,
830 vmSymbols::toString_name(),
831 vmSymbols::void_string_signature(),
832 CHECK);
833 assert(result.get_type() == T_OBJECT, "just checking");
834 string = Handle(THREAD, (oop)result.get_jobject());
835 }
836
837 ResourceMark rm;
838 out->print("create class loader data " INTPTR_FORMAT, p2i(cld));
839 out->print(" for instance " INTPTR_FORMAT " of %s", p2i((void *)cld->class_loader()),
840 cld->loader_name());
841
842 if (string.not_null()) {
843 out->print(": ");
844 java_lang_String::print(string(), out);
845 }
846 out->cr();
847 }
848
849
850 void ClassLoaderDataGraph::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) {
851 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
852 cld->oops_do(f, klass_closure, must_claim);
853 }
854 }
855
856 void ClassLoaderDataGraph::keep_alive_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) {
857 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
858 if (cld->keep_alive()) {
859 cld->oops_do(f, klass_closure, must_claim);
860 }
861 }
862 }
863
864 void ClassLoaderDataGraph::always_strong_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) {
865 if (ClassUnloading) {
866 keep_alive_oops_do(f, klass_closure, must_claim);
867 } else {
868 oops_do(f, klass_closure, must_claim);
869 }
870 }
871
872 void ClassLoaderDataGraph::cld_do(CLDClosure* cl) {
873 for (ClassLoaderData* cld = _head; cl != NULL && cld != NULL; cld = cld->next()) {
874 cl->do_cld(cld);
875 }
876 }
877
878 void ClassLoaderDataGraph::cld_unloading_do(CLDClosure* cl) {
879 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!");
880 // Only walk the head until any clds not purged from prior unloading
881 // (CMS doesn't purge right away).
882 for (ClassLoaderData* cld = _unloading; cld != _saved_unloading; cld = cld->next()) {
883 assert(cld->is_unloading(), "invariant");
884 cl->do_cld(cld);
885 }
886 }
887
888 void ClassLoaderDataGraph::roots_cld_do(CLDClosure* strong, CLDClosure* weak) {
889 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->_next) {
890 CLDClosure* closure = cld->keep_alive() ? strong : weak;
891 if (closure != NULL) {
892 closure->do_cld(cld);
893 }
894 }
895 }
896
897 void ClassLoaderDataGraph::keep_alive_cld_do(CLDClosure* cl) {
898 roots_cld_do(cl, NULL);
899 }
900
901 void ClassLoaderDataGraph::always_strong_cld_do(CLDClosure* cl) {
902 if (ClassUnloading) {
903 keep_alive_cld_do(cl);
904 } else {
905 cld_do(cl);
906 }
907 }
908
909 void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) {
910 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
911 cld->classes_do(klass_closure);
912 }
913 }
914
915 void ClassLoaderDataGraph::classes_do(void f(Klass* const)) {
916 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
917 cld->classes_do(f);
918 }
919 }
920
921 void ClassLoaderDataGraph::methods_do(void f(Method*)) {
922 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
923 cld->methods_do(f);
924 }
925 }
926
927 void ClassLoaderDataGraph::modules_do(void f(ModuleEntry*)) {
928 assert_locked_or_safepoint(Module_lock);
929 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
930 cld->modules_do(f);
931 }
932 }
933
934 void ClassLoaderDataGraph::modules_unloading_do(void f(ModuleEntry*)) {
935 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!");
936 // Only walk the head until any clds not purged from prior unloading
937 // (CMS doesn't purge right away).
938 for (ClassLoaderData* cld = _unloading; cld != _saved_unloading; cld = cld->next()) {
939 assert(cld->is_unloading(), "invariant");
940 cld->modules_do(f);
941 }
942 }
943
944 void ClassLoaderDataGraph::packages_do(void f(PackageEntry*)) {
945 assert_locked_or_safepoint(Module_lock);
946 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
947 cld->packages_do(f);
948 }
949 }
950
951 void ClassLoaderDataGraph::packages_unloading_do(void f(PackageEntry*)) {
952 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!");
953 // Only walk the head until any clds not purged from prior unloading
954 // (CMS doesn't purge right away).
955 for (ClassLoaderData* cld = _unloading; cld != _saved_unloading; cld = cld->next()) {
956 assert(cld->is_unloading(), "invariant");
957 cld->packages_do(f);
958 }
959 }
960
961 void ClassLoaderDataGraph::loaded_classes_do(KlassClosure* klass_closure) {
962 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
963 cld->loaded_classes_do(klass_closure);
964 }
965 }
966
967 void ClassLoaderDataGraph::classes_unloading_do(void f(Klass* const)) {
968 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!");
969 // Only walk the head until any clds not purged from prior unloading
970 // (CMS doesn't purge right away).
971 for (ClassLoaderData* cld = _unloading; cld != _saved_unloading; cld = cld->next()) {
972 assert(cld->is_unloading(), "invariant");
973 cld->classes_do(f);
974 }
975 }
976
977 GrowableArray<ClassLoaderData*>* ClassLoaderDataGraph::new_clds() {
978 assert(_head == NULL || _saved_head != NULL, "remember_new_clds(true) not called?");
979
980 GrowableArray<ClassLoaderData*>* array = new GrowableArray<ClassLoaderData*>();
981
982 // The CLDs in [_head, _saved_head] were all added during last call to remember_new_clds(true);
983 ClassLoaderData* curr = _head;
984 while (curr != _saved_head) {
985 if (!curr->claimed()) {
986 array->push(curr);
987 LogTarget(Debug, class, loader, data) lt;
988 if (lt.is_enabled()) {
989 LogStream ls(lt);
990 ls.print("found new CLD: ");
991 curr->print_value_on(&ls);
992 ls.cr();
993 }
994 }
995
996 curr = curr->_next;
997 }
998
999 return array;
1000 }
1001
1002 bool ClassLoaderDataGraph::unload_list_contains(const void* x) {
1003 assert(SafepointSynchronize::is_at_safepoint(), "only safe to call at safepoint");
1004 for (ClassLoaderData* cld = _unloading; cld != NULL; cld = cld->next()) {
1005 if (cld->metaspace_or_null() != NULL && cld->metaspace_or_null()->contains(x)) {
1006 return true;
1007 }
1008 }
1009 return false;
1010 }
1011
1012 #ifndef PRODUCT
1013 bool ClassLoaderDataGraph::contains_loader_data(ClassLoaderData* loader_data) {
1014 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) {
1015 if (loader_data == data) {
1016 return true;
1017 }
1018 }
1019
1020 return false;
1021 }
1022 #endif // PRODUCT
1023
1024
1025 // Move class loader data from main list to the unloaded list for unloading
1026 // and deallocation later.
1027 bool ClassLoaderDataGraph::do_unloading(BoolObjectClosure* is_alive_closure,
1028 bool clean_previous_versions) {
1029
1030 ClassLoaderData* data = _head;
1031 ClassLoaderData* prev = NULL;
1032 bool seen_dead_loader = false;
1033
1034 // Mark metadata seen on the stack only so we can delete unneeded entries.
1035 // Only walk all metadata, including the expensive code cache walk, for Full GC
1036 // and only if class redefinition and if there's previous versions of
1037 // Klasses to delete.
1038 bool walk_all_metadata = clean_previous_versions &&
1039 JvmtiExport::has_redefined_a_class() &&
1040 InstanceKlass::has_previous_versions_and_reset();
1041 MetadataOnStackMark md_on_stack(walk_all_metadata);
1042
1043 // Save previous _unloading pointer for CMS which may add to unloading list before
1044 // purging and we don't want to rewalk the previously unloaded class loader data.
1045 _saved_unloading = _unloading;
1046
1047 data = _head;
1048 while (data != NULL) {
1049 if (data->is_alive(is_alive_closure)) {
1050 // clean metaspace
1051 if (walk_all_metadata) {
1052 data->classes_do(InstanceKlass::purge_previous_versions);
1053 }
1054 data->free_deallocate_list();
1055 prev = data;
1056 data = data->next();
1057 continue;
1058 }
1059 seen_dead_loader = true;
1060 ClassLoaderData* dead = data;
1061 dead->unload();
1062 data = data->next();
1063 // Remove from loader list.
1064 // This class loader data will no longer be found
1065 // in the ClassLoaderDataGraph.
1066 if (prev != NULL) {
1067 prev->set_next(data);
1068 } else {
1069 assert(dead == _head, "sanity check");
1070 _head = data;
1071 }
1072 dead->set_next(_unloading);
1073 _unloading = dead;
1074 }
1075
1076 if (seen_dead_loader) {
1077 // Walk a ModuleEntry's reads and a PackageEntry's exports lists
1078 // to determine if there are modules on those lists that are now
1079 // dead and should be removed. A module's life cycle is equivalent
1080 // to its defining class loader's life cycle. Since a module is
1081 // considered dead if its class loader is dead, these walks must
1082 // occur after each class loader's aliveness is determined.
1083 data = _head;
1084 while (data != NULL) {
1085 if (data->packages() != NULL) {
1086 data->packages()->purge_all_package_exports();
1087 }
1088 if (data->modules_defined()) {
1089 data->modules()->purge_all_module_reads();
1090 }
1091 data = data->next();
1092 }
1093
1094 post_class_unload_events();
1095 }
1096
1097 return seen_dead_loader;
1098 }
1099
1100 void ClassLoaderDataGraph::purge() {
1101 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!");
1102 ClassLoaderData* list = _unloading;
1103 _unloading = NULL;
1104 ClassLoaderData* next = list;
1105 bool classes_unloaded = false;
1106 while (next != NULL) {
1107 ClassLoaderData* purge_me = next;
1108 next = purge_me->next();
1109 delete purge_me;
1110 classes_unloaded = true;
1111 }
1112 if (classes_unloaded) {
1113 Metaspace::purge();
1114 set_metaspace_oom(false);
1115 }
1116 }
1117
1118 void ClassLoaderDataGraph::post_class_unload_events() {
1119 #if INCLUDE_TRACE
1120 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!");
1121 if (Tracing::enabled()) {
1122 if (Tracing::is_event_enabled(TraceClassUnloadEvent)) {
1123 assert(_unloading != NULL, "need class loader data unload list!");
1124 _class_unload_time = Ticks::now();
1125 classes_unloading_do(&class_unload_event);
1126 }
1127 Tracing::on_unloading_classes();
1128 }
1129 #endif
1130 }
1131
1132 // CDS support
1133
1134 // Global metaspaces for writing information to the shared archive. When
1135 // application CDS is supported, we may need one per metaspace, so this
1136 // sort of looks like it.
1137 Metaspace* ClassLoaderData::_ro_metaspace = NULL;
1138 Metaspace* ClassLoaderData::_rw_metaspace = NULL;
1139 static bool _shared_metaspaces_initialized = false;
1140
1141 // Initialize shared metaspaces (change to call from somewhere not lazily)
1142 void ClassLoaderData::initialize_shared_metaspaces() {
1143 assert(DumpSharedSpaces, "only use this for dumping shared spaces");
1144 assert(this == ClassLoaderData::the_null_class_loader_data(),
1145 "only supported for null loader data for now");
1146 assert (!_shared_metaspaces_initialized, "only initialize once");
1147 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
1148 _ro_metaspace = new Metaspace(_metaspace_lock, Metaspace::ROMetaspaceType);
1149 _rw_metaspace = new Metaspace(_metaspace_lock, Metaspace::ReadWriteMetaspaceType);
1150 _shared_metaspaces_initialized = true;
1151 }
1152
1153 Metaspace* ClassLoaderData::ro_metaspace() {
1154 assert(_ro_metaspace != NULL, "should already be initialized");
1155 return _ro_metaspace;
1156 }
1157
1158 Metaspace* ClassLoaderData::rw_metaspace() {
1159 assert(_rw_metaspace != NULL, "should already be initialized");
1160 return _rw_metaspace;
1161 }
1162
1163 ClassLoaderDataGraphKlassIteratorAtomic::ClassLoaderDataGraphKlassIteratorAtomic()
1164 : _next_klass(NULL) {
1165 ClassLoaderData* cld = ClassLoaderDataGraph::_head;
1166 Klass* klass = NULL;
1167
1168 // Find the first klass in the CLDG.
1169 while (cld != NULL) {
1170 assert_locked_or_safepoint(cld->metaspace_lock());
1171 klass = cld->_klasses;
1172 if (klass != NULL) {
1173 _next_klass = klass;
1174 return;
1175 }
1176 cld = cld->next();
1177 }
1178 }
1179
1180 Klass* ClassLoaderDataGraphKlassIteratorAtomic::next_klass_in_cldg(Klass* klass) {
1181 Klass* next = klass->next_link();
1182 if (next != NULL) {
1183 return next;
1184 }
1185
1186 // No more klasses in the current CLD. Time to find a new CLD.
1187 ClassLoaderData* cld = klass->class_loader_data();
1188 assert_locked_or_safepoint(cld->metaspace_lock());
1189 while (next == NULL) {
1190 cld = cld->next();
1191 if (cld == NULL) {
1192 break;
1193 }
1194 next = cld->_klasses;
1195 }
1196
1197 return next;
1198 }
1199
1200 Klass* ClassLoaderDataGraphKlassIteratorAtomic::next_klass() {
1201 Klass* head = _next_klass;
1202
1203 while (head != NULL) {
1204 Klass* next = next_klass_in_cldg(head);
1205
1206 Klass* old_head = (Klass*)Atomic::cmpxchg_ptr(next, &_next_klass, head);
1207
1208 if (old_head == head) {
1209 return head; // Won the CAS.
1210 }
1211
1212 head = old_head;
1213 }
1214
1215 // Nothing more for the iterator to hand out.
1216 assert(head == NULL, "head is " PTR_FORMAT ", expected not null:", p2i(head));
1217 return NULL;
1218 }
1219
1220 ClassLoaderDataGraphMetaspaceIterator::ClassLoaderDataGraphMetaspaceIterator() {
1221 _data = ClassLoaderDataGraph::_head;
1222 }
1223
1224 ClassLoaderDataGraphMetaspaceIterator::~ClassLoaderDataGraphMetaspaceIterator() {}
1225
1226 #ifndef PRODUCT
1227 // callable from debugger
1228 extern "C" int print_loader_data_graph() {
1229 ClassLoaderDataGraph::dump_on(tty);
1230 return 0;
1231 }
1232
1233 void ClassLoaderDataGraph::verify() {
1234 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) {
1235 data->verify();
1236 }
1237 }
1238
1239 void ClassLoaderDataGraph::dump_on(outputStream * const out) {
1240 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) {
1241 data->dump(out);
1242 }
1243 MetaspaceAux::dump(out);
1244 }
1245 #endif // PRODUCT
1246
1247 void ClassLoaderData::print_value_on(outputStream* out) const {
1248 if (class_loader() == NULL) {
1249 out->print("NULL class_loader");
1250 } else {
1251 out->print("class loader " INTPTR_FORMAT " ", p2i(this));
1252 class_loader()->print_value_on(out);
1253 }
1254 }
1255
1256 #if INCLUDE_TRACE
1257
1258 Ticks ClassLoaderDataGraph::_class_unload_time;
1259
1260 void ClassLoaderDataGraph::class_unload_event(Klass* const k) {
1261 assert(k != NULL, "invariant");
1262
1263 // post class unload event
1264 EventClassUnload event(UNTIMED);
1265 event.set_endtime(_class_unload_time);
1266 event.set_unloadedClass(k);
1267 event.set_definingClassLoader(k->class_loader_data());
1268 event.commit();
1269 }
1270
1271 #endif // INCLUDE_TRACE