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