1 /*
2 * Copyright (c) 2014, 2025, 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 "cds/aotClassLocation.hpp"
26 #include "cds/archiveBuilder.hpp"
27 #include "cds/archiveHeapLoader.hpp"
28 #include "cds/archiveUtils.hpp"
29 #include "cds/cdsConfig.hpp"
30 #include "cds/cdsProtectionDomain.hpp"
31 #include "cds/classListParser.hpp"
32 #include "cds/classListWriter.hpp"
33 #include "cds/dumpTimeClassInfo.inline.hpp"
34 #include "cds/dynamicArchive.hpp"
35 #include "cds/filemap.hpp"
36 #include "cds/heapShared.hpp"
37 #include "cds/lambdaFormInvokers.inline.hpp"
38 #include "cds/metaspaceShared.hpp"
39 #include "cds/runTimeClassInfo.hpp"
40 #include "cds/unregisteredClasses.hpp"
41 #include "classfile/classFileStream.hpp"
42 #include "classfile/classLoader.hpp"
43 #include "classfile/classLoaderData.inline.hpp"
44 #include "classfile/classLoaderDataGraph.hpp"
45 #include "classfile/classLoaderExt.hpp"
46 #include "classfile/dictionary.hpp"
47 #include "classfile/javaClasses.hpp"
48 #include "classfile/javaClasses.inline.hpp"
49 #include "classfile/symbolTable.hpp"
50 #include "classfile/systemDictionary.hpp"
51 #include "classfile/systemDictionaryShared.hpp"
52 #include "classfile/verificationType.hpp"
53 #include "classfile/vmClasses.hpp"
54 #include "classfile/vmSymbols.hpp"
55 #include "interpreter/bootstrapInfo.hpp"
56 #include "jfr/jfrEvents.hpp"
57 #include "logging/log.hpp"
58 #include "logging/logStream.hpp"
59 #include "memory/allocation.hpp"
60 #include "memory/metadataFactory.hpp"
61 #include "memory/metaspaceClosure.hpp"
62 #include "memory/oopFactory.hpp"
63 #include "memory/resourceArea.hpp"
64 #include "memory/universe.hpp"
65 #include "oops/compressedKlass.inline.hpp"
66 #include "oops/instanceKlass.hpp"
67 #include "oops/klass.inline.hpp"
68 #include "oops/methodData.hpp"
69 #include "oops/objArrayKlass.hpp"
70 #include "oops/objArrayOop.inline.hpp"
71 #include "oops/oop.inline.hpp"
72 #include "oops/oopHandle.inline.hpp"
73 #include "oops/typeArrayOop.inline.hpp"
74 #include "runtime/arguments.hpp"
75 #include "runtime/handles.inline.hpp"
76 #include "runtime/java.hpp"
77 #include "runtime/javaCalls.hpp"
78 #include "runtime/mutexLocker.hpp"
79 #include "utilities/resourceHash.hpp"
80 #include "utilities/stringUtils.hpp"
81
82 SystemDictionaryShared::ArchiveInfo SystemDictionaryShared::_static_archive;
83 SystemDictionaryShared::ArchiveInfo SystemDictionaryShared::_dynamic_archive;
84
85 DumpTimeSharedClassTable* SystemDictionaryShared::_dumptime_table = nullptr;
86 DumpTimeLambdaProxyClassDictionary* SystemDictionaryShared::_dumptime_lambda_proxy_class_dictionary = nullptr;
87
88 static bool _ignore_new_classes = false;
89
90 // Used by NoClassLoadingMark
91 DEBUG_ONLY(bool SystemDictionaryShared::_class_loading_may_happen = true;)
92
93 #ifdef ASSERT
94 static void check_klass_after_loading(const Klass* k) {
95 #ifdef _LP64
96 if (k != nullptr && UseCompressedClassPointers && k->needs_narrow_id()) {
97 CompressedKlassPointers::check_encodable(k);
98 }
99 #endif
100 }
101 #endif
102
103 InstanceKlass* SystemDictionaryShared::load_shared_class_for_builtin_loader(
104 Symbol* class_name, Handle class_loader, TRAPS) {
105 assert(CDSConfig::is_using_archive(), "must be");
106 InstanceKlass* ik = find_builtin_class(class_name);
107
108 if (ik != nullptr && !ik->shared_loading_failed()) {
109 if ((SystemDictionary::is_system_class_loader(class_loader()) && ik->is_shared_app_class()) ||
110 (SystemDictionary::is_platform_class_loader(class_loader()) && ik->is_shared_platform_class())) {
111 SharedClassLoadingMark slm(THREAD, ik);
112 PackageEntry* pkg_entry = CDSProtectionDomain::get_package_entry_from_class(ik, class_loader);
113 Handle protection_domain;
114 if (!class_name->starts_with("jdk/proxy")) // java/lang/reflect/Proxy$ProxyBuilder defines the proxy classes with a null protection domain.
115 {
116 protection_domain = CDSProtectionDomain::init_security_info(class_loader, ik, pkg_entry, CHECK_NULL);
117 }
118 return load_shared_class(ik, class_loader, protection_domain, nullptr, pkg_entry, THREAD);
119 }
120 }
121 return nullptr;
122 }
123
124 // This function is called for loading only UNREGISTERED classes
125 InstanceKlass* SystemDictionaryShared::lookup_from_stream(Symbol* class_name,
126 Handle class_loader,
127 Handle protection_domain,
128 const ClassFileStream* cfs,
129 TRAPS) {
130 if (!CDSConfig::is_using_archive()) {
131 return nullptr;
132 }
133 if (class_name == nullptr) { // don't do this for hidden classes
134 return nullptr;
135 }
136 if (class_loader.is_null() ||
137 SystemDictionary::is_system_class_loader(class_loader()) ||
138 SystemDictionary::is_platform_class_loader(class_loader())) {
139 // Do nothing for the BUILTIN loaders.
140 return nullptr;
141 }
142
143 const RunTimeClassInfo* record = find_record(&_static_archive._unregistered_dictionary,
144 &_dynamic_archive._unregistered_dictionary,
145 class_name);
146 if (record == nullptr) {
147 return nullptr;
148 }
149
150 int clsfile_size = cfs->length();
151 int clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
152
153 if (!record->matches(clsfile_size, clsfile_crc32)) {
154 return nullptr;
155 }
156
157 return acquire_class_for_current_thread(record->klass(), class_loader,
158 protection_domain, cfs,
159 THREAD);
160 }
161
162 InstanceKlass* SystemDictionaryShared::acquire_class_for_current_thread(
163 InstanceKlass *ik,
164 Handle class_loader,
165 Handle protection_domain,
166 const ClassFileStream *cfs,
167 TRAPS) {
168 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader());
169
170 {
171 MutexLocker mu(THREAD, SharedDictionary_lock);
172 if (ik->class_loader_data() != nullptr) {
173 // ik is already loaded (by this loader or by a different loader)
174 // or ik is being loaded by a different thread (by this loader or by a different loader)
175 return nullptr;
176 }
177
178 // No other thread has acquired this yet, so give it to *this thread*
179 ik->set_class_loader_data(loader_data);
180 }
181
182 // No longer holding SharedDictionary_lock
183 // No need to lock, as <ik> can be held only by a single thread.
184 loader_data->add_class(ik);
185
186 // Get the package entry.
187 PackageEntry* pkg_entry = CDSProtectionDomain::get_package_entry_from_class(ik, class_loader);
188
189 // Load and check super/interfaces, restore unshareable info
190 InstanceKlass* shared_klass = load_shared_class(ik, class_loader, protection_domain,
191 cfs, pkg_entry, THREAD);
192 if (shared_klass == nullptr || HAS_PENDING_EXCEPTION) {
193 // TODO: clean up <ik> so it can be used again
194 return nullptr;
195 }
196
197 return shared_klass;
198 }
199
200 // Guaranteed to return non-null value for non-shared classes.
201 // k must not be a shared class.
202 DumpTimeClassInfo* SystemDictionaryShared::get_info(InstanceKlass* k) {
203 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
204 return get_info_locked(k);
205 }
206
207 DumpTimeClassInfo* SystemDictionaryShared::get_info_locked(InstanceKlass* k) {
208 assert_lock_strong(DumpTimeTable_lock);
209 DumpTimeClassInfo* info = _dumptime_table->get_info(k);
210 assert(info != nullptr, "must be");
211 return info;
212 }
213
214 bool SystemDictionaryShared::check_for_exclusion(InstanceKlass* k, DumpTimeClassInfo* info) {
215 if (CDSConfig::is_dumping_dynamic_archive() && MetaspaceShared::is_in_shared_metaspace(k)) {
216 // We have reached a super type that's already in the base archive. Treat it
217 // as "not excluded".
218 return false;
219 }
220
221 if (info == nullptr) {
222 info = _dumptime_table->get(k);
223 assert(info != nullptr, "supertypes of any classes in _dumptime_table must either be shared, or must also be in _dumptime_table");
224 }
225
226 if (!info->has_checked_exclusion()) {
227 if (check_for_exclusion_impl(k)) {
228 info->set_excluded();
229 }
230 info->set_has_checked_exclusion();
231 }
232
233 return info->is_excluded();
234 }
235
236 // Returns true so the caller can do: return warn_excluded(".....");
237 bool SystemDictionaryShared::warn_excluded(InstanceKlass* k, const char* reason) {
238 ResourceMark rm;
239 log_warning(cds)("Skipping %s: %s", k->name()->as_C_string(), reason);
240 return true;
241 }
242
243 bool SystemDictionaryShared::is_jfr_event_class(InstanceKlass *k) {
244 while (k) {
245 if (k->name()->equals("jdk/internal/event/Event")) {
246 return true;
247 }
248 k = k->java_super();
249 }
250 return false;
251 }
252
253 bool SystemDictionaryShared::is_registered_lambda_proxy_class(InstanceKlass* ik) {
254 DumpTimeClassInfo* info = _dumptime_table->get(ik);
255 bool result = (info != nullptr) ? info->_is_registered_lambda_proxy : false;
256 if (result) {
257 assert(!CDSConfig::is_dumping_invokedynamic(), "only used in legacy lambda proxy support");
258 }
259 return result;
260 }
261
262 void SystemDictionaryShared::reset_registered_lambda_proxy_class(InstanceKlass* ik) {
263 DumpTimeClassInfo* info = _dumptime_table->get(ik);
264 if (info != nullptr) {
265 info->_is_registered_lambda_proxy = false;
266 info->set_excluded();
267 }
268 }
269
270 bool SystemDictionaryShared::is_early_klass(InstanceKlass* ik) {
271 DumpTimeClassInfo* info = _dumptime_table->get(ik);
272 return (info != nullptr) ? info->is_early_klass() : false;
273 }
274
275 bool SystemDictionaryShared::is_hidden_lambda_proxy(InstanceKlass* ik) {
276 assert(ik->is_shared(), "applicable to only a shared class");
277 if (ik->is_hidden()) {
278 return true;
279 } else {
280 return false;
281 }
282 }
283
284 void SystemDictionaryShared::ignore_new_classes() {
285 _ignore_new_classes = true;
286 }
287
288
289 bool SystemDictionaryShared::check_for_exclusion_impl(InstanceKlass* k) {
290 if (CDSConfig::is_dumping_final_static_archive() && k->is_shared_unregistered_class()
291 && k->is_shared()) {
292 return false; // Do not exclude: unregistered classes are passed from preimage to final image.
293 }
294
295 if (k->is_in_error_state()) {
296 return warn_excluded(k, "In error state");
297 }
298 if (k->is_scratch_class()) {
299 return warn_excluded(k, "A scratch class");
300 }
301 if (!k->is_loaded()) {
302 return warn_excluded(k, "Not in loaded state");
303 }
304 if (has_been_redefined(k)) {
305 return warn_excluded(k, "Has been redefined");
306 }
307 if (!k->is_hidden() && k->shared_classpath_index() < 0 && is_builtin(k)) {
308 if (k->name()->starts_with("java/lang/invoke/BoundMethodHandle$Species_")) {
309 // This class is dynamically generated by the JDK
310 if (CDSConfig::is_dumping_aot_linked_classes()) {
311 k->set_shared_classpath_index(0);
312 } else {
313 ResourceMark rm;
314 log_info(cds)("Skipping %s because it is dynamically generated", k->name()->as_C_string());
315 return true; // exclude without warning
316 }
317 } else {
318 // These are classes loaded from unsupported locations (such as those loaded by JVMTI native
319 // agent during dump time).
320 return warn_excluded(k, "Unsupported location");
321 }
322 }
323 if (k->signers() != nullptr) {
324 // We cannot include signed classes in the archive because the certificates
325 // used during dump time may be different than those used during
326 // runtime (due to expiration, etc).
327 return warn_excluded(k, "Signed JAR");
328 }
329 if (is_jfr_event_class(k)) {
330 // We cannot include JFR event classes because they need runtime-specific
331 // instrumentation in order to work with -XX:FlightRecorderOptions:retransform=false.
332 // There are only a small number of these classes, so it's not worthwhile to
333 // support them and make CDS more complicated.
334 if (!CDSConfig::is_dumping_reflection_data()) { // FIXME: !!! HACK !!!
335 return warn_excluded(k, "JFR event class");
336 }
337 }
338
339 if (!k->is_linked()) {
340 if (has_class_failed_verification(k)) {
341 return warn_excluded(k, "Failed verification");
342 } else if (CDSConfig::is_dumping_aot_linked_classes()) {
343 // Most loaded classes should have been speculatively linked by MetaspaceShared::link_class_for_cds().
344 // However, we do not speculatively link old classes, as they are not recorded by
345 // SystemDictionaryShared::record_linking_constraint(). As a result, such an unlinked
346 // class may fail to verify in AOTLinkedClassBulkLoader::init_required_classes_for_loader(),
347 // causing the JVM to fail at bootstrap.
348 return warn_excluded(k, "Unlinked class not supported by AOTClassLinking");
349 } else if (CDSConfig::is_dumping_preimage_static_archive()) {
350 // When dumping the final static archive, we will unconditionally load and link all
351 // classes from tje preimage. We don't want to get a VerifyError when linking this class.
352 return warn_excluded(k, "Unlinked class not supported by AOTConfiguration");
353 }
354 } else {
355 if (!k->can_be_verified_at_dumptime() && !CDSConfig::preserve_all_dumptime_verification_states(k)) {
356 // We have an old class that has been linked (e.g., it's been executed during
357 // dump time). This class has been verified using the old verifier, which
358 // doesn't save the verification constraints, so check_verification_constraints()
359 // won't work at runtime.
360 // As a result, we cannot store this class. It must be loaded and fully verified
361 // at runtime.
362 return warn_excluded(k, "Old class has been linked");
363 }
364 }
365
366 InstanceKlass* super = k->java_super();
367 if (super != nullptr && check_for_exclusion(super, nullptr)) {
368 ResourceMark rm;
369 log_warning(cds)("Skipping %s: super class %s is excluded", k->name()->as_C_string(), super->name()->as_C_string());
370 return true;
371 }
372
373 Array<InstanceKlass*>* interfaces = k->local_interfaces();
374 int len = interfaces->length();
375 for (int i = 0; i < len; i++) {
376 InstanceKlass* intf = interfaces->at(i);
377 if (check_for_exclusion(intf, nullptr)) {
378 ResourceMark rm;
379 log_warning(cds)("Skipping %s: interface %s is excluded", k->name()->as_C_string(), intf->name()->as_C_string());
380 return true;
381 }
382 }
383
384 if (k == UnregisteredClasses::UnregisteredClassLoader_klass()) {
385 ResourceMark rm;
386 log_debug(cds)("Skipping %s: used only when dumping CDS archive", k->name()->as_C_string());
387 return true;
388 }
389
390 if (k->name()->equals("jdk/internal/misc/CDS$DummyForDynamicArchive") && !CDSConfig::is_dumping_dynamic_archive()) {
391 ResourceMark rm;
392 log_debug(cds)("Skipping %s: used only when dumping dynamic CDS archive", k->name()->as_C_string());
393 return true;
394 }
395
396
397 return false; // false == k should NOT be excluded
398 }
399
400 bool SystemDictionaryShared::is_builtin_loader(ClassLoaderData* loader_data) {
401 oop class_loader = loader_data->class_loader();
402 return (class_loader == nullptr ||
403 SystemDictionary::is_system_class_loader(class_loader) ||
404 SystemDictionary::is_platform_class_loader(class_loader));
405 }
406
407 bool SystemDictionaryShared::has_platform_or_app_classes() {
408 if (FileMapInfo::current_info()->has_platform_or_app_classes()) {
409 return true;
410 }
411 if (DynamicArchive::is_mapped() &&
412 FileMapInfo::dynamic_info()->has_platform_or_app_classes()) {
413 return true;
414 }
415 return false;
416 }
417
418 // The following stack shows how this code is reached:
419 //
420 // [0] SystemDictionaryShared::find_or_load_shared_class()
421 // [1] JVM_FindLoadedClass
422 // [2] java.lang.ClassLoader.findLoadedClass0()
423 // [3] java.lang.ClassLoader.findLoadedClass()
424 // [4] jdk.internal.loader.BuiltinClassLoader.loadClassOrNull()
425 // [5] jdk.internal.loader.BuiltinClassLoader.loadClass()
426 // [6] jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(), or
427 // jdk.internal.loader.ClassLoaders$PlatformClassLoader.loadClass()
428 //
429 // AppCDS supports fast class loading for these 2 built-in class loaders:
430 // jdk.internal.loader.ClassLoaders$PlatformClassLoader
431 // jdk.internal.loader.ClassLoaders$AppClassLoader
432 // with the following assumptions (based on the JDK core library source code):
433 //
434 // [a] these two loaders use the BuiltinClassLoader.loadClassOrNull() to
435 // load the named class.
436 // [b] BuiltinClassLoader.loadClassOrNull() first calls findLoadedClass(name).
437 // [c] At this point, if we can find the named class inside the
438 // shared_dictionary, we can perform further checks (see
439 // SystemDictionary::is_shared_class_visible) to ensure that this class
440 // was loaded by the same class loader during dump time.
441 //
442 // Given these assumptions, we intercept the findLoadedClass() call to invoke
443 // SystemDictionaryShared::find_or_load_shared_class() to load the shared class from
444 // the archive for the 2 built-in class loaders. This way,
445 // we can improve start-up because we avoid decoding the classfile,
446 // and avoid delegating to the parent loader.
447 //
448 // NOTE: there's a lot of assumption about the Java code. If any of that change, this
449 // needs to be redesigned.
450
451 InstanceKlass* SystemDictionaryShared::find_or_load_shared_class(
452 Symbol* name, Handle class_loader, TRAPS) {
453 InstanceKlass* k = nullptr;
454 if (CDSConfig::is_using_archive()) {
455 if (!has_platform_or_app_classes()) {
456 return nullptr;
457 }
458
459 if (SystemDictionary::is_system_class_loader(class_loader()) ||
460 SystemDictionary::is_platform_class_loader(class_loader())) {
461 ClassLoaderData *loader_data = register_loader(class_loader);
462 Dictionary* dictionary = loader_data->dictionary();
463
464 // Note: currently, find_or_load_shared_class is called only from
465 // JVM_FindLoadedClass and used for PlatformClassLoader and AppClassLoader,
466 // which are parallel-capable loaders, so a lock here is NOT taken.
467 assert(get_loader_lock_or_null(class_loader) == nullptr, "ObjectLocker not required");
468 {
469 MutexLocker mu(THREAD, SystemDictionary_lock);
470 InstanceKlass* check = dictionary->find_class(THREAD, name);
471 if (check != nullptr) {
472 return check;
473 }
474 }
475
476 k = load_shared_class_for_builtin_loader(name, class_loader, THREAD);
477 if (k != nullptr) {
478 SharedClassLoadingMark slm(THREAD, k);
479 k = find_or_define_instance_class(name, class_loader, k, CHECK_NULL);
480 }
481 }
482 }
483
484 DEBUG_ONLY(check_klass_after_loading(k);)
485
486 return k;
487 }
488
489 class UnregisteredClassesTable : public ResourceHashtable<
490 Symbol*, InstanceKlass*,
491 15889, // prime number
492 AnyObj::C_HEAP> {};
493
494 static UnregisteredClassesTable* _unregistered_classes_table = nullptr;
495
496 // true == class was successfully added; false == a duplicated class (with the same name) already exists.
497 bool SystemDictionaryShared::add_unregistered_class(Thread* current, InstanceKlass* klass) {
498 // We don't allow duplicated unregistered classes with the same name.
499 // We only archive the first class with that name that succeeds putting
500 // itself into the table.
501 assert(CDSConfig::is_dumping_archive() || ClassListWriter::is_enabled(), "sanity");
502 MutexLocker ml(current, UnregisteredClassesTable_lock, Mutex::_no_safepoint_check_flag);
503 Symbol* name = klass->name();
504 if (_unregistered_classes_table == nullptr) {
505 _unregistered_classes_table = new (mtClass)UnregisteredClassesTable();
506 }
507 bool created;
508 InstanceKlass** v = _unregistered_classes_table->put_if_absent(name, klass, &created);
509 if (created) {
510 name->increment_refcount();
511 }
512 return (klass == *v);
513 }
514
515 void SystemDictionaryShared::set_shared_class_misc_info(InstanceKlass* k, ClassFileStream* cfs) {
516 assert(CDSConfig::is_dumping_archive(), "sanity");
517 assert(!is_builtin(k), "must be unregistered class");
518 DumpTimeClassInfo* info = get_info(k);
519 info->_clsfile_size = cfs->length();
520 info->_clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
521 }
522
523 void SystemDictionaryShared::initialize() {
524 if (CDSConfig::is_dumping_archive()) {
525 _dumptime_table = new (mtClass) DumpTimeSharedClassTable;
526 _dumptime_lambda_proxy_class_dictionary =
527 new (mtClass) DumpTimeLambdaProxyClassDictionary;
528 if (CDSConfig::is_dumping_heap()) {
529 HeapShared::init_dumping();
530 }
531 }
532 }
533
534 void SystemDictionaryShared::init_dumptime_info(InstanceKlass* k) {
535 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
536 assert(SystemDictionaryShared::class_loading_may_happen(), "sanity");
537 DumpTimeClassInfo* info = _dumptime_table->allocate_info(k);
538 if (_ignore_new_classes) {
539 if (!LambdaFormInvokers::may_be_regenerated_class(k->name())) {
540 ResourceMark rm;
541 log_debug(cds)("Skipping %s: Class loaded for lambda form invoker regeneration", k->name()->as_C_string());
542 info->set_has_checked_exclusion();
543 info->set_excluded();
544 }
545 }
546 }
547
548 void SystemDictionaryShared::remove_dumptime_info(InstanceKlass* k) {
549 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
550 _dumptime_table->remove(k);
551 }
552
553 void SystemDictionaryShared::handle_class_unloading(InstanceKlass* klass) {
554 if (CDSConfig::is_dumping_archive()) {
555 remove_dumptime_info(klass);
556 }
557
558 if (CDSConfig::is_dumping_archive() || ClassListWriter::is_enabled()) {
559 MutexLocker ml(Thread::current(), UnregisteredClassesTable_lock, Mutex::_no_safepoint_check_flag);
560 if (_unregistered_classes_table != nullptr) {
561 // Remove the class from _unregistered_classes_table: keep the entry but
562 // set it to null. This ensure no classes with the same name can be
563 // added again.
564 InstanceKlass** v = _unregistered_classes_table->get(klass->name());
565 if (v != nullptr) {
566 *v = nullptr;
567 }
568 }
569 } else {
570 assert(_unregistered_classes_table == nullptr, "must not be used");
571 }
572
573 if (ClassListWriter::is_enabled()) {
574 ClassListWriter cw;
575 cw.handle_class_unloading((const InstanceKlass*)klass);
576 }
577 }
578
579 void SystemDictionaryShared::init_dumptime_info_from_preimage(InstanceKlass* k) {
580 init_dumptime_info(k);
581 copy_verification_constraints_from_preimage(k);
582 copy_linking_constraints_from_preimage(k);
583
584 if (SystemDictionary::is_platform_class_loader(k->class_loader())) {
585 AOTClassLocationConfig::dumptime_set_has_platform_classes();
586 } else if (SystemDictionary::is_system_class_loader(k->class_loader())) {
587 AOTClassLocationConfig::dumptime_set_has_app_classes();
588 }
589 }
590
591 // Check if a class or any of its supertypes has been redefined.
592 bool SystemDictionaryShared::has_been_redefined(InstanceKlass* k) {
593 if (k->has_been_redefined()) {
594 return true;
595 }
596 if (k->java_super() != nullptr && has_been_redefined(k->java_super())) {
597 return true;
598 }
599 Array<InstanceKlass*>* interfaces = k->local_interfaces();
600 int len = interfaces->length();
601 for (int i = 0; i < len; i++) {
602 if (has_been_redefined(interfaces->at(i))) {
603 return true;
604 }
605 }
606 return false;
607 }
608
609 // k is a class before relocating by ArchiveBuilder
610 void SystemDictionaryShared::validate_before_archiving(InstanceKlass* k) {
611 ResourceMark rm;
612 const char* name = k->name()->as_C_string();
613 DumpTimeClassInfo* info = _dumptime_table->get(k);
614 assert(!class_loading_may_happen(), "class loading must be disabled");
615 guarantee(info != nullptr, "Class %s must be entered into _dumptime_table", name);
616 guarantee(!info->is_excluded(), "Should not attempt to archive excluded class %s", name);
617 if (is_builtin(k)) {
618 if (k->is_hidden()) {
619 if (!CDSConfig::is_dumping_invokedynamic()) {
620 assert(is_registered_lambda_proxy_class(k), "unexpected hidden class %s", name);
621 }
622 }
623 guarantee(!k->is_shared_unregistered_class(),
624 "Class loader type must be set for BUILTIN class %s", name);
625
626 } else {
627 guarantee(k->is_shared_unregistered_class(),
628 "Class loader type must not be set for UNREGISTERED class %s", name);
629 }
630 }
631
632 class UnregisteredClassesDuplicationChecker : StackObj {
633 GrowableArray<InstanceKlass*> _list;
634 Thread* _thread;
635 public:
636 UnregisteredClassesDuplicationChecker() : _thread(Thread::current()) {}
637
638 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
639 if (!SystemDictionaryShared::is_builtin(k)) {
640 _list.append(k);
641 }
642 }
643
644 static int compare_by_loader(InstanceKlass** a, InstanceKlass** b) {
645 ClassLoaderData* loader_a = a[0]->class_loader_data();
646 ClassLoaderData* loader_b = b[0]->class_loader_data();
647
648 if (loader_a != loader_b) {
649 return primitive_compare(loader_a, loader_b);
650 } else {
651 return primitive_compare(a[0], b[0]);
652 }
653 }
654
655 void mark_duplicated_classes() {
656 // Two loaders may load two identical or similar hierarchies of classes. If we
657 // check for duplication in random order, we may end up excluding important base classes
658 // in both hierarchies, causing most of the classes to be excluded.
659 // We sort the classes by their loaders. This way we're likely to archive
660 // all classes in the one of the two hierarchies.
661 _list.sort(compare_by_loader);
662 for (int i = 0; i < _list.length(); i++) {
663 InstanceKlass* k = _list.at(i);
664 bool i_am_first = SystemDictionaryShared::add_unregistered_class(_thread, k);
665 if (!i_am_first) {
666 SystemDictionaryShared::warn_excluded(k, "Duplicated unregistered class");
667 SystemDictionaryShared::set_excluded_locked(k);
668 }
669 }
670 }
671 };
672
673 // Returns true if the class should be excluded. This can be called by
674 // AOTConstantPoolResolver before or after we enter the CDS safepoint.
675 // When called before the safepoint, we need to link the class so that
676 // it can be checked by check_for_exclusion().
677 bool SystemDictionaryShared::should_be_excluded(Klass* k) {
678 assert(CDSConfig::is_dumping_archive(), "sanity");
679 assert(CDSConfig::current_thread_is_vm_or_dumper(), "sanity");
680
681 if (k->is_objArray_klass()) {
682 return should_be_excluded(ObjArrayKlass::cast(k)->bottom_klass());
683 }
684
685 if (!k->is_instance_klass()) {
686 return false;
687 } else {
688 InstanceKlass* ik = InstanceKlass::cast(k);
689
690 if (!SafepointSynchronize::is_at_safepoint()) {
691 if (!ik->is_linked()) {
692 // check_for_exclusion() below doesn't link unlinked classes. We come
693 // here only when we are trying to aot-link constant pool entries, so
694 // we'd better link the class.
695 JavaThread* THREAD = JavaThread::current();
696 ik->link_class(THREAD);
697 if (HAS_PENDING_EXCEPTION) {
698 CLEAR_PENDING_EXCEPTION;
699 return true; // linking failed -- let's exclude it
700 }
701 }
702
703 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
704 DumpTimeClassInfo* p = get_info_locked(ik);
705 if (p->is_excluded()) {
706 return true;
707 }
708 return check_for_exclusion(ik, p);
709 } else {
710 // No need to check for is_linked() as all eligible classes should have
711 // already been linked in MetaspaceShared::link_class_for_cds().
712 // Can't take the lock as we are in safepoint.
713 DumpTimeClassInfo* p = _dumptime_table->get(ik);
714 if (p->is_excluded()) {
715 return true;
716 }
717 return check_for_exclusion(ik, p);
718 }
719 }
720 }
721
722 void SystemDictionaryShared::finish_exclusion_checks() {
723 if (CDSConfig::is_dumping_dynamic_archive()) {
724 // Do this first -- if a base class is excluded due to duplication,
725 // all of its subclasses will also be excluded.
726 ResourceMark rm;
727 UnregisteredClassesDuplicationChecker dup_checker;
728 _dumptime_table->iterate_all_live_classes(&dup_checker);
729 dup_checker.mark_duplicated_classes();
730 }
731
732 _dumptime_table->iterate_all_live_classes([&] (InstanceKlass* k, DumpTimeClassInfo& info) {
733 SystemDictionaryShared::check_for_exclusion(k, &info);
734 });
735
736 _dumptime_table->update_counts();
737 cleanup_lambda_proxy_class_dictionary();
738 }
739
740 bool SystemDictionaryShared::is_excluded_class(InstanceKlass* k) {
741 assert(!class_loading_may_happen(), "class loading must be disabled");
742 assert_lock_strong(DumpTimeTable_lock);
743 assert(CDSConfig::is_dumping_archive(), "sanity");
744 DumpTimeClassInfo* p = get_info_locked(k);
745 return p->is_excluded();
746 }
747
748 void SystemDictionaryShared::set_excluded_locked(InstanceKlass* k) {
749 assert_lock_strong(DumpTimeTable_lock);
750 assert(CDSConfig::is_dumping_archive(), "sanity");
751 DumpTimeClassInfo* info = get_info_locked(k);
752 info->set_excluded();
753 }
754
755 void SystemDictionaryShared::set_excluded(InstanceKlass* k) {
756 assert(CDSConfig::is_dumping_archive(), "sanity");
757 DumpTimeClassInfo* info = get_info(k);
758 info->set_excluded();
759 }
760
761 void SystemDictionaryShared::set_class_has_failed_verification(InstanceKlass* ik) {
762 assert(CDSConfig::is_dumping_archive(), "sanity");
763 DumpTimeClassInfo* p = get_info(ik);
764 p->set_failed_verification();
765 }
766
767 bool SystemDictionaryShared::has_class_failed_verification(InstanceKlass* ik) {
768 assert(CDSConfig::is_dumping_archive(), "sanity");
769 DumpTimeClassInfo* p = _dumptime_table->get(ik);
770 return (p == nullptr) ? false : p->failed_verification();
771 }
772
773 void SystemDictionaryShared::dumptime_classes_do(class MetaspaceClosure* it) {
774 assert_lock_strong(DumpTimeTable_lock);
775
776 auto do_klass = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
777 if (CDSConfig::is_dumping_final_static_archive() && !k->is_loaded()) {
778 assert(k->is_shared_unregistered_class(), "must be");
779 info.metaspace_pointers_do(it);
780 } else if (k->is_loader_alive() && !info.is_excluded()) {
781 info.metaspace_pointers_do(it);
782 }
783 };
784 _dumptime_table->iterate_all_live_classes(do_klass);
785
786 auto do_lambda = [&] (LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
787 if (key.caller_ik()->is_loader_alive()) {
788 info.metaspace_pointers_do(it);
789 key.metaspace_pointers_do(it);
790 }
791 };
792 _dumptime_lambda_proxy_class_dictionary->iterate_all(do_lambda);
793 }
794
795 bool SystemDictionaryShared::add_verification_constraint(InstanceKlass* k, Symbol* name,
796 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) {
797 assert(CDSConfig::is_dumping_archive(), "sanity");
798 if (CDSConfig::is_dumping_dynamic_archive() && k->is_shared()) {
799 // k is a new class in the static archive, but one of its supertypes is an old class, so k wasn't
800 // verified during dump time. No need to record constraints as k won't be included in the dynamic archive.
801 return false;
802 }
803 if (CDSConfig::is_dumping_aot_linked_classes() && is_builtin(k)) {
804 // There's no need to save verification constraints
805 // TODO -- double check the logic before integrating into mainline!!
806 return false;
807 }
808
809 DumpTimeClassInfo* info = get_info(k);
810 info->add_verification_constraint(k, name, from_name, from_field_is_protected,
811 from_is_array, from_is_object);
812
813 if (CDSConfig::is_dumping_dynamic_archive()) {
814 // For dynamic dumping, we can resolve all the constraint classes for all class loaders during
815 // the initial run prior to creating the archive before vm exit. We will also perform verification
816 // check when running with the archive.
817 return false;
818 } else {
819 if (is_builtin(k)) {
820 // For builtin class loaders, we can try to complete the verification check at dump time,
821 // because we can resolve all the constraint classes. We will also perform verification check
822 // when running with the archive.
823 return false;
824 } else {
825 // For non-builtin class loaders, we cannot complete the verification check at dump time,
826 // because at dump time we don't know how to resolve classes for such loaders.
827 return true;
828 }
829 }
830 }
831
832 void SystemDictionaryShared::add_enum_klass_static_field(InstanceKlass* ik, int root_index) {
833 assert(CDSConfig::is_dumping_heap(), "sanity");
834 DumpTimeClassInfo* info = get_info_locked(ik);
835 info->add_enum_klass_static_field(root_index);
836 }
837
838 void SystemDictionaryShared::add_to_dump_time_lambda_proxy_class_dictionary(LambdaProxyClassKey& key,
839 InstanceKlass* proxy_klass) {
840 assert_lock_strong(DumpTimeTable_lock);
841
842 bool created;
843 DumpTimeLambdaProxyClassInfo* info = _dumptime_lambda_proxy_class_dictionary->put_if_absent(key, &created);
844 info->add_proxy_klass(proxy_klass);
845 if (created) {
846 ++_dumptime_lambda_proxy_class_dictionary->_count;
847 }
848 }
849
850 void SystemDictionaryShared::add_lambda_proxy_class(InstanceKlass* caller_ik,
851 InstanceKlass* lambda_ik,
852 Symbol* invoked_name,
853 Symbol* invoked_type,
854 Symbol* method_type,
855 Method* member_method,
856 Symbol* instantiated_method_type,
857 TRAPS) {
858 if (CDSConfig::is_dumping_invokedynamic()) {
859 // The lambda proxy classes will be stored as part of aot-resolved constant pool entries.
860 // There's no need to remember them in a separate table.
861 return;
862 }
863
864 if (CDSConfig::is_dumping_preimage_static_archive()) {
865 // Information about lambda proxies are recorded in FinalImageRecipes.
866 return;
867 }
868
869 assert(caller_ik->class_loader() == lambda_ik->class_loader(), "mismatched class loader");
870 assert(caller_ik->class_loader_data() == lambda_ik->class_loader_data(), "mismatched class loader data");
871 assert(java_lang_Class::class_data(lambda_ik->java_mirror()) == nullptr, "must not have class data");
872
873 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
874
875 lambda_ik->assign_class_loader_type();
876 lambda_ik->set_shared_classpath_index(caller_ik->shared_classpath_index());
877 InstanceKlass* nest_host = caller_ik->nest_host(CHECK);
878 assert(nest_host != nullptr, "unexpected nullptr nest_host");
879
880 DumpTimeClassInfo* info = _dumptime_table->get(lambda_ik);
881 if (info != nullptr && !lambda_ik->is_non_strong_hidden() && is_builtin(lambda_ik) && is_builtin(caller_ik)
882 // Don't include the lambda proxy if its nest host is not in the "linked" state.
883 && nest_host->is_linked()) {
884 // Set _is_registered_lambda_proxy in DumpTimeClassInfo so that the lambda_ik
885 // won't be excluded during dumping of shared archive.
886 info->_is_registered_lambda_proxy = true;
887 info->set_nest_host(nest_host);
888
889 LambdaProxyClassKey key(caller_ik,
890 invoked_name,
891 invoked_type,
892 method_type,
893 member_method,
894 instantiated_method_type);
895 add_to_dump_time_lambda_proxy_class_dictionary(key, lambda_ik);
896 }
897 }
898
899 InstanceKlass* SystemDictionaryShared::get_shared_lambda_proxy_class(InstanceKlass* caller_ik,
900 Symbol* invoked_name,
901 Symbol* invoked_type,
902 Symbol* method_type,
903 Method* member_method,
904 Symbol* instantiated_method_type) {
905 if (CDSConfig::is_dumping_final_static_archive()) {
906 return nullptr;
907 }
908
909 assert(caller_ik != nullptr, "sanity");
910 assert(invoked_name != nullptr, "sanity");
911 assert(invoked_type != nullptr, "sanity");
912 assert(method_type != nullptr, "sanity");
913 assert(instantiated_method_type != nullptr, "sanity");
914
915 if (!caller_ik->is_shared() ||
916 !invoked_name->is_shared() ||
917 !invoked_type->is_shared() ||
918 !method_type->is_shared() ||
919 (member_method != nullptr && !member_method->is_shared()) ||
920 !instantiated_method_type->is_shared()) {
921 // These can't be represented as u4 offset, but we wouldn't have archived a lambda proxy in this case anyway.
922 return nullptr;
923 }
924
925 MutexLocker ml(CDSLambda_lock, Mutex::_no_safepoint_check_flag);
926 RunTimeLambdaProxyClassKey key =
927 RunTimeLambdaProxyClassKey::init_for_runtime(caller_ik, invoked_name, invoked_type,
928 method_type, member_method, instantiated_method_type);
929
930 // Try to retrieve the lambda proxy class from static archive.
931 const RunTimeLambdaProxyClassInfo* info = _static_archive.lookup_lambda_proxy_class(&key);
932 InstanceKlass* proxy_klass = retrieve_lambda_proxy_class(info);
933 if (proxy_klass == nullptr) {
934 if (info != nullptr && log_is_enabled(Debug, cds)) {
935 ResourceMark rm;
936 log_debug(cds)("Used all static archived lambda proxy classes for: %s %s%s",
937 caller_ik->external_name(), invoked_name->as_C_string(), invoked_type->as_C_string());
938 }
939 } else {
940 return proxy_klass;
941 }
942
943 // Retrieving from static archive is unsuccessful, try dynamic archive.
944 info = _dynamic_archive.lookup_lambda_proxy_class(&key);
945 proxy_klass = retrieve_lambda_proxy_class(info);
946 if (proxy_klass == nullptr) {
947 if (info != nullptr && log_is_enabled(Debug, cds)) {
948 ResourceMark rm;
949 log_debug(cds)("Used all dynamic archived lambda proxy classes for: %s %s%s",
950 caller_ik->external_name(), invoked_name->as_C_string(), invoked_type->as_C_string());
951 }
952 }
953 return proxy_klass;
954 }
955
956 InstanceKlass* SystemDictionaryShared::retrieve_lambda_proxy_class(const RunTimeLambdaProxyClassInfo* info) {
957 InstanceKlass* proxy_klass = nullptr;
958 if (info != nullptr) {
959 InstanceKlass* curr_klass = info->proxy_klass_head();
960 InstanceKlass* prev_klass = curr_klass;
961 if (curr_klass->lambda_proxy_is_available()) {
962 while (curr_klass->next_link() != nullptr) {
963 prev_klass = curr_klass;
964 curr_klass = InstanceKlass::cast(curr_klass->next_link());
965 }
966 assert(curr_klass->is_hidden(), "must be");
967 assert(curr_klass->lambda_proxy_is_available(), "must be");
968
969 prev_klass->set_next_link(nullptr);
970 proxy_klass = curr_klass;
971 proxy_klass->clear_lambda_proxy_is_available();
972 if (log_is_enabled(Debug, cds)) {
973 ResourceMark rm;
974 log_debug(cds)("Loaded lambda proxy: " PTR_FORMAT " %s ", p2i(proxy_klass), proxy_klass->external_name());
975 }
976 }
977 }
978 return proxy_klass;
979 }
980
981 InstanceKlass* SystemDictionaryShared::get_shared_nest_host(InstanceKlass* lambda_ik) {
982 assert(!CDSConfig::is_dumping_static_archive() && CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
983 RunTimeClassInfo* record = RunTimeClassInfo::get_for(lambda_ik);
984 return record->nest_host();
985 }
986
987 InstanceKlass* SystemDictionaryShared::prepare_shared_lambda_proxy_class(InstanceKlass* lambda_ik,
988 InstanceKlass* caller_ik, TRAPS) {
989 Handle class_loader(THREAD, caller_ik->class_loader());
990 Handle protection_domain;
991 PackageEntry* pkg_entry = caller_ik->package();
992 if (caller_ik->class_loader() != nullptr) {
993 protection_domain = CDSProtectionDomain::init_security_info(class_loader, caller_ik, pkg_entry, CHECK_NULL);
994 }
995
996 InstanceKlass* shared_nest_host = get_shared_nest_host(lambda_ik);
997 assert(shared_nest_host != nullptr, "unexpected nullptr _nest_host");
998
999 InstanceKlass* loaded_lambda =
1000 SystemDictionary::load_shared_lambda_proxy_class(lambda_ik, class_loader, protection_domain, pkg_entry, CHECK_NULL);
1001
1002 if (loaded_lambda == nullptr) {
1003 return nullptr;
1004 }
1005
1006 // Ensures the nest host is the same as the lambda proxy's
1007 // nest host recorded at dump time.
1008 InstanceKlass* nest_host = caller_ik->nest_host(THREAD);
1009 assert(nest_host == shared_nest_host, "mismatched nest host");
1010
1011 EventClassLoad class_load_start_event;
1012
1013 // Add to class hierarchy, and do possible deoptimizations.
1014 loaded_lambda->add_to_hierarchy(THREAD);
1015 // But, do not add to dictionary.
1016
1017 loaded_lambda->link_class(CHECK_NULL);
1018 // notify jvmti
1019 if (JvmtiExport::should_post_class_load()) {
1020 JvmtiExport::post_class_load(THREAD, loaded_lambda);
1021 }
1022 if (class_load_start_event.should_commit()) {
1023 SystemDictionary::post_class_load_event(&class_load_start_event, loaded_lambda, ClassLoaderData::class_loader_data(class_loader()));
1024 }
1025
1026 loaded_lambda->initialize(CHECK_NULL);
1027
1028 return loaded_lambda;
1029 }
1030
1031 void SystemDictionaryShared::check_verification_constraints(InstanceKlass* klass,
1032 TRAPS) {
1033 assert(CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
1034 RunTimeClassInfo* record = RunTimeClassInfo::get_for(klass);
1035
1036 int length = record->num_verifier_constraints();
1037 if (length > 0) {
1038 for (int i = 0; i < length; i++) {
1039 RunTimeClassInfo::RTVerifierConstraint* vc = record->verifier_constraint_at(i);
1040 Symbol* name = vc->name();
1041 Symbol* from_name = vc->from_name();
1042
1043 if (log_is_enabled(Trace, cds, verification)) {
1044 ResourceMark rm(THREAD);
1045 log_trace(cds, verification)("check_verification_constraint: %s: %s must be subclass of %s [0x%x]",
1046 klass->external_name(), from_name->as_klass_external_name(),
1047 name->as_klass_external_name(), record->verifier_constraint_flag(i));
1048 }
1049
1050 bool ok = VerificationType::resolve_and_check_assignability(klass, name, from_name,
1051 record->from_field_is_protected(i), record->from_is_array(i), record->from_is_object(i), CHECK);
1052 if (!ok) {
1053 ResourceMark rm(THREAD);
1054 stringStream ss;
1055
1056 ss.print_cr("Bad type on operand stack");
1057 ss.print_cr("Exception Details:");
1058 ss.print_cr(" Location:\n %s", klass->name()->as_C_string());
1059 ss.print_cr(" Reason:\n Type '%s' is not assignable to '%s'",
1060 from_name->as_quoted_ascii(), name->as_quoted_ascii());
1061 THROW_MSG(vmSymbols::java_lang_VerifyError(), ss.as_string());
1062 }
1063 }
1064 }
1065 }
1066
1067 void SystemDictionaryShared::copy_verification_constraints_from_preimage(InstanceKlass* klass) {
1068 assert(CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
1069 DumpTimeClassInfo* dt_info = get_info(klass);
1070 RunTimeClassInfo* rt_info = RunTimeClassInfo::get_for(klass); // from preimage
1071
1072 int length = rt_info->num_verifier_constraints();
1073 if (length > 0) {
1074 for (int i = 0; i < length; i++) {
1075 RunTimeClassInfo::RTVerifierConstraint* vc = rt_info->verifier_constraint_at(i);
1076 Symbol* name = vc->name();
1077 Symbol* from_name = vc->from_name();
1078
1079 dt_info->add_verification_constraint(klass, name, from_name,
1080 rt_info->from_field_is_protected(i), rt_info->from_is_array(i), rt_info->from_is_object(i));
1081 }
1082 }
1083 }
1084
1085 static oop get_class_loader_by(char type) {
1086 if (type == (char)ClassLoader::BOOT_LOADER) {
1087 return (oop)nullptr;
1088 } else if (type == (char)ClassLoader::PLATFORM_LOADER) {
1089 return SystemDictionary::java_platform_loader();
1090 } else {
1091 assert (type == (char)ClassLoader::APP_LOADER, "Sanity");
1092 return SystemDictionary::java_system_loader();
1093 }
1094 }
1095
1096 // Record class loader constraints that are checked inside
1097 // InstanceKlass::link_class(), so that these can be checked quickly
1098 // at runtime without laying out the vtable/itables.
1099 void SystemDictionaryShared::record_linking_constraint(Symbol* name, InstanceKlass* klass,
1100 Handle loader1, Handle loader2) {
1101 // A linking constraint check is executed when:
1102 // - klass extends or implements type S
1103 // - klass overrides method S.M(...) with X.M
1104 // - If klass defines the method M, X is
1105 // the same as klass.
1106 // - If klass does not define the method M,
1107 // X must be a supertype of klass and X.M is
1108 // a default method defined by X.
1109 // - loader1 = X->class_loader()
1110 // - loader2 = S->class_loader()
1111 // - loader1 != loader2
1112 // - M's parameter(s) include an object type T
1113 // We require that
1114 // - whenever loader1 and loader2 try to
1115 // resolve the type T, they must always resolve to
1116 // the same InstanceKlass.
1117 // NOTE: type T may or may not be currently resolved in
1118 // either of these two loaders. The check itself does not
1119 // try to resolve T.
1120 oop klass_loader = klass->class_loader();
1121
1122 if (!is_system_class_loader(klass_loader) &&
1123 !is_platform_class_loader(klass_loader)) {
1124 // If klass is loaded by system/platform loaders, we can
1125 // guarantee that klass and S must be loaded by the same
1126 // respective loader between dump time and run time, and
1127 // the exact same check on (name, loader1, loader2) will
1128 // be executed. Hence, we can cache this check and execute
1129 // it at runtime without walking the vtable/itables.
1130 //
1131 // This cannot be guaranteed for classes loaded by other
1132 // loaders, so we bail.
1133 return;
1134 }
1135
1136 assert(is_builtin(klass), "must be");
1137 assert(klass_loader != nullptr, "should not be called for boot loader");
1138 assert(loader1 != loader2, "must be");
1139
1140 if (CDSConfig::is_dumping_dynamic_archive() && Thread::current()->is_VM_thread()) {
1141 // We are re-laying out the vtable/itables of the *copy* of
1142 // a class during the final stage of dynamic dumping. The
1143 // linking constraints for this class has already been recorded.
1144 return;
1145 }
1146 assert(!Thread::current()->is_VM_thread(), "must be");
1147
1148 assert(CDSConfig::is_dumping_archive(), "sanity");
1149 DumpTimeClassInfo* info = get_info(klass);
1150 info->record_linking_constraint(name, loader1, loader2);
1151 }
1152
1153 // returns true IFF there's no need to re-initialize the i/v-tables for klass for
1154 // the purpose of checking class loader constraints.
1155 bool SystemDictionaryShared::check_linking_constraints(Thread* current, InstanceKlass* klass) {
1156 assert(CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
1157 LogTarget(Info, class, loader, constraints) log;
1158 if (klass->is_shared_boot_class()) {
1159 // No class loader constraint check performed for boot classes.
1160 return true;
1161 }
1162 if (klass->is_shared_platform_class() || klass->is_shared_app_class()) {
1163 RunTimeClassInfo* info = RunTimeClassInfo::get_for(klass);
1164 assert(info != nullptr, "Sanity");
1165 if (info->num_loader_constraints() > 0) {
1166 HandleMark hm(current);
1167 for (int i = 0; i < info->num_loader_constraints(); i++) {
1168 RunTimeClassInfo::RTLoaderConstraint* lc = info->loader_constraint_at(i);
1169 Symbol* name = lc->constraint_name();
1170 Handle loader1(current, get_class_loader_by(lc->_loader_type1));
1171 Handle loader2(current, get_class_loader_by(lc->_loader_type2));
1172 if (log.is_enabled()) {
1173 ResourceMark rm(current);
1174 log.print("[CDS add loader constraint for class %s symbol %s loader[0] %s loader[1] %s",
1175 klass->external_name(), name->as_C_string(),
1176 ClassLoaderData::class_loader_data(loader1())->loader_name_and_id(),
1177 ClassLoaderData::class_loader_data(loader2())->loader_name_and_id());
1178 }
1179 if (!SystemDictionary::add_loader_constraint(name, klass, loader1, loader2)) {
1180 // Loader constraint violation has been found. The caller
1181 // will re-layout the vtable/itables to produce the correct
1182 // exception.
1183 if (log.is_enabled()) {
1184 log.print(" failed]");
1185 }
1186 return false;
1187 }
1188 if (log.is_enabled()) {
1189 log.print(" succeeded]");
1190 }
1191 }
1192 return true; // for all recorded constraints added successfully.
1193 }
1194 }
1195 if (log.is_enabled()) {
1196 ResourceMark rm(current);
1197 log.print("[CDS has not recorded loader constraint for class %s]", klass->external_name());
1198 }
1199 return false;
1200 }
1201
1202 void SystemDictionaryShared::copy_linking_constraints_from_preimage(InstanceKlass* klass) {
1203 assert(CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
1204 JavaThread* current = JavaThread::current();
1205 if (klass->is_shared_platform_class() || klass->is_shared_app_class()) {
1206 RunTimeClassInfo* rt_info = RunTimeClassInfo::get_for(klass); // from preimage
1207
1208 if (rt_info->num_loader_constraints() > 0) {
1209 for (int i = 0; i < rt_info->num_loader_constraints(); i++) {
1210 RunTimeClassInfo::RTLoaderConstraint* lc = rt_info->loader_constraint_at(i);
1211 Symbol* name = lc->constraint_name();
1212 Handle loader1(current, get_class_loader_by(lc->_loader_type1));
1213 Handle loader2(current, get_class_loader_by(lc->_loader_type2));
1214 record_linking_constraint(name, klass, loader1, loader2);
1215 }
1216 }
1217 }
1218 }
1219
1220 bool SystemDictionaryShared::is_supported_invokedynamic(BootstrapInfo* bsi) {
1221 LogTarget(Debug, cds, lambda) log;
1222 if (bsi->arg_values() == nullptr || !bsi->arg_values()->is_objArray()) {
1223 if (log.is_enabled()) {
1224 LogStream log_stream(log);
1225 log.print("bsi check failed");
1226 log.print(" bsi->arg_values().not_null() %d", bsi->arg_values().not_null());
1227 if (bsi->arg_values().not_null()) {
1228 log.print(" bsi->arg_values()->is_objArray() %d", bsi->arg_values()->is_objArray());
1229 bsi->print_msg_on(&log_stream);
1230 }
1231 }
1232 return false;
1233 }
1234
1235 Handle bsm = bsi->bsm();
1236 if (bsm.is_null() || !java_lang_invoke_DirectMethodHandle::is_instance(bsm())) {
1237 if (log.is_enabled()) {
1238 log.print("bsm check failed");
1239 log.print(" bsm.is_null() %d", bsm.is_null());
1240 log.print(" java_lang_invoke_DirectMethodHandle::is_instance(bsm()) %d",
1241 java_lang_invoke_DirectMethodHandle::is_instance(bsm()));
1242 }
1243 return false;
1244 }
1245
1246 oop mn = java_lang_invoke_DirectMethodHandle::member(bsm());
1247 Method* method = java_lang_invoke_MemberName::vmtarget(mn);
1248 if (method->klass_name()->equals("java/lang/invoke/LambdaMetafactory") &&
1249 method->name()->equals("metafactory") &&
1250 method->signature()->equals("(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;"
1251 "Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;"
1252 "Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;")) {
1253 return true;
1254 } else {
1255 if (log.is_enabled()) {
1256 ResourceMark rm;
1257 log.print("method check failed");
1258 log.print(" klass_name() %s", method->klass_name()->as_C_string());
1259 log.print(" name() %s", method->name()->as_C_string());
1260 log.print(" signature() %s", method->signature()->as_C_string());
1261 }
1262 }
1263
1264 return false;
1265 }
1266
1267 class EstimateSizeForArchive : StackObj {
1268 size_t _shared_class_info_size;
1269 int _num_builtin_klasses;
1270 int _num_unregistered_klasses;
1271
1272 public:
1273 EstimateSizeForArchive() {
1274 _shared_class_info_size = 0;
1275 _num_builtin_klasses = 0;
1276 _num_unregistered_klasses = 0;
1277 }
1278
1279 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
1280 if (!info.is_excluded()) {
1281 size_t byte_size = info.runtime_info_bytesize();
1282 _shared_class_info_size += align_up(byte_size, SharedSpaceObjectAlignment);
1283 }
1284 }
1285
1286 size_t total() {
1287 return _shared_class_info_size;
1288 }
1289 };
1290
1291 size_t SystemDictionaryShared::estimate_size_for_archive() {
1292 EstimateSizeForArchive est;
1293 _dumptime_table->iterate_all_live_classes(&est);
1294 size_t total_size = est.total() +
1295 CompactHashtableWriter::estimate_size(_dumptime_table->count_of(true)) +
1296 CompactHashtableWriter::estimate_size(_dumptime_table->count_of(false));
1297
1298 size_t bytesize = align_up(sizeof(RunTimeLambdaProxyClassInfo), SharedSpaceObjectAlignment);
1299 total_size +=
1300 (bytesize * _dumptime_lambda_proxy_class_dictionary->_count) +
1301 CompactHashtableWriter::estimate_size(_dumptime_lambda_proxy_class_dictionary->_count);
1302
1303 return total_size;
1304 }
1305
1306 unsigned int SystemDictionaryShared::hash_for_shared_dictionary(address ptr) {
1307 if (ArchiveBuilder::is_active() && ArchiveBuilder::current()->is_in_buffer_space(ptr)) {
1308 uintx offset = ArchiveBuilder::current()->any_to_offset(ptr);
1309 unsigned int hash = primitive_hash<uintx>(offset);
1310 DEBUG_ONLY({
1311 if (MetaspaceObj::is_shared((const MetaspaceObj*)ptr)) {
1312 assert(hash == SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr), "must be");
1313 }
1314 });
1315 return hash;
1316 } else {
1317 return SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr);
1318 }
1319 }
1320
1321 class CopyLambdaProxyClassInfoToArchive : StackObj {
1322 CompactHashtableWriter* _writer;
1323 ArchiveBuilder* _builder;
1324 public:
1325 CopyLambdaProxyClassInfoToArchive(CompactHashtableWriter* writer)
1326 : _writer(writer), _builder(ArchiveBuilder::current()) {}
1327 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
1328 // In static dump, info._proxy_klasses->at(0) is already relocated to point to the archived class
1329 // (not the original class).
1330 ResourceMark rm;
1331 log_info(cds,dynamic)("Archiving hidden %s", info._proxy_klasses->at(0)->external_name());
1332 size_t byte_size = sizeof(RunTimeLambdaProxyClassInfo);
1333 RunTimeLambdaProxyClassInfo* runtime_info =
1334 (RunTimeLambdaProxyClassInfo*)ArchiveBuilder::ro_region_alloc(byte_size);
1335 runtime_info->init(key, info);
1336 unsigned int hash = runtime_info->hash();
1337 u4 delta = _builder->any_to_offset_u4((void*)runtime_info);
1338 _writer->add(hash, delta);
1339 return true;
1340 }
1341 };
1342
1343 class AdjustLambdaProxyClassInfo : StackObj {
1344 public:
1345 AdjustLambdaProxyClassInfo() {}
1346 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
1347 int len = info._proxy_klasses->length();
1348 InstanceKlass* last_buff_k = nullptr;
1349
1350 for (int i = len - 1; i >= 0; i--) {
1351 InstanceKlass* orig_k = info._proxy_klasses->at(i);
1352 InstanceKlass* buff_k = ArchiveBuilder::current()->get_buffered_addr(orig_k);
1353 assert(ArchiveBuilder::current()->is_in_buffer_space(buff_k), "must be");
1354 buff_k->set_lambda_proxy_is_available();
1355 buff_k->set_next_link(last_buff_k);
1356 if (last_buff_k != nullptr) {
1357 ArchivePtrMarker::mark_pointer(buff_k->next_link_addr());
1358 }
1359 last_buff_k = buff_k;
1360 }
1361
1362 return true;
1363 }
1364 };
1365
1366 class CopySharedClassInfoToArchive : StackObj {
1367 CompactHashtableWriter* _writer;
1368 bool _is_builtin;
1369 ArchiveBuilder *_builder;
1370 public:
1371 CopySharedClassInfoToArchive(CompactHashtableWriter* writer,
1372 bool is_builtin)
1373 : _writer(writer), _is_builtin(is_builtin), _builder(ArchiveBuilder::current()) {}
1374
1375 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
1376 if (!info.is_excluded() && info.is_builtin() == _is_builtin) {
1377 size_t byte_size = info.runtime_info_bytesize();
1378 RunTimeClassInfo* record;
1379 record = (RunTimeClassInfo*)ArchiveBuilder::ro_region_alloc(byte_size);
1380 record->init(info);
1381
1382 unsigned int hash;
1383 Symbol* name = info._klass->name();
1384 name = ArchiveBuilder::current()->get_buffered_addr(name);
1385 hash = SystemDictionaryShared::hash_for_shared_dictionary((address)name);
1386 u4 delta = _builder->buffer_to_offset_u4((address)record);
1387 if (_is_builtin && info._klass->is_hidden()) {
1388 // skip
1389 } else {
1390 _writer->add(hash, delta);
1391 }
1392 if (log_is_enabled(Trace, cds, hashtables)) {
1393 ResourceMark rm;
1394 log_trace(cds,hashtables)("%s dictionary: %s", (_is_builtin ? "builtin" : "unregistered"), info._klass->external_name());
1395 }
1396
1397 // Save this for quick runtime lookup of InstanceKlass* -> RunTimeClassInfo*
1398 InstanceKlass* buffered_klass = ArchiveBuilder::current()->get_buffered_addr(info._klass);
1399 RunTimeClassInfo::set_for(buffered_klass, record);
1400 }
1401 }
1402 };
1403
1404 void SystemDictionaryShared::write_lambda_proxy_class_dictionary(LambdaProxyClassDictionary *dictionary) {
1405 CompactHashtableStats stats;
1406 dictionary->reset();
1407 CompactHashtableWriter writer(_dumptime_lambda_proxy_class_dictionary->_count, &stats);
1408 CopyLambdaProxyClassInfoToArchive copy(&writer);
1409 _dumptime_lambda_proxy_class_dictionary->iterate(©);
1410 writer.dump(dictionary, "lambda proxy class dictionary");
1411 }
1412
1413 void SystemDictionaryShared::write_dictionary(RunTimeSharedDictionary* dictionary,
1414 bool is_builtin) {
1415 CompactHashtableStats stats;
1416 dictionary->reset();
1417 CompactHashtableWriter writer(_dumptime_table->count_of(is_builtin), &stats);
1418 CopySharedClassInfoToArchive copy(&writer, is_builtin);
1419 assert_lock_strong(DumpTimeTable_lock);
1420 _dumptime_table->iterate_all_live_classes(©);
1421 writer.dump(dictionary, is_builtin ? "builtin dictionary" : "unregistered dictionary");
1422 }
1423
1424 void SystemDictionaryShared::write_to_archive(bool is_static_archive) {
1425 ArchiveInfo* archive = get_archive(is_static_archive);
1426
1427 write_dictionary(&archive->_builtin_dictionary, true);
1428 write_dictionary(&archive->_unregistered_dictionary, false);
1429
1430 write_lambda_proxy_class_dictionary(&archive->_lambda_proxy_class_dictionary);
1431 }
1432
1433 void SystemDictionaryShared::adjust_lambda_proxy_class_dictionary() {
1434 AdjustLambdaProxyClassInfo adjuster;
1435 _dumptime_lambda_proxy_class_dictionary->iterate(&adjuster);
1436 }
1437
1438 void SystemDictionaryShared::serialize_dictionary_headers(SerializeClosure* soc,
1439 bool is_static_archive) {
1440 ArchiveInfo* archive = get_archive(is_static_archive);
1441
1442 archive->_builtin_dictionary.serialize_header(soc);
1443 archive->_unregistered_dictionary.serialize_header(soc);
1444 archive->_lambda_proxy_class_dictionary.serialize_header(soc);
1445 }
1446
1447 void SystemDictionaryShared::serialize_vm_classes(SerializeClosure* soc) {
1448 for (auto id : EnumRange<vmClassID>{}) {
1449 soc->do_ptr(vmClasses::klass_addr_at(id));
1450 }
1451 }
1452
1453 const RunTimeClassInfo*
1454 SystemDictionaryShared::find_record(RunTimeSharedDictionary* static_dict, RunTimeSharedDictionary* dynamic_dict, Symbol* name) {
1455 if (!CDSConfig::is_using_archive() || !name->is_shared()) {
1456 // The names of all shared classes must also be a shared Symbol.
1457 return nullptr;
1458 }
1459
1460 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(name);
1461 const RunTimeClassInfo* record = nullptr;
1462 if (DynamicArchive::is_mapped()) {
1463 // Use the regenerated holder classes in the dynamic archive as they
1464 // have more methods than those in the base archive.
1465 if (LambdaFormInvokers::may_be_regenerated_class(name)) {
1466 record = dynamic_dict->lookup(name, hash, 0);
1467 if (record != nullptr) {
1468 return record;
1469 }
1470 }
1471 }
1472
1473 if (!MetaspaceShared::is_shared_dynamic(name)) {
1474 // The names of all shared classes in the static dict must also be in the
1475 // static archive
1476 record = static_dict->lookup(name, hash, 0);
1477 }
1478
1479 if (record == nullptr && DynamicArchive::is_mapped()) {
1480 record = dynamic_dict->lookup(name, hash, 0);
1481 }
1482
1483 return record;
1484 }
1485
1486 InstanceKlass* SystemDictionaryShared::find_builtin_class(Symbol* name) {
1487 const RunTimeClassInfo* record = find_record(&_static_archive._builtin_dictionary,
1488 &_dynamic_archive._builtin_dictionary,
1489 name);
1490 if (record != nullptr) {
1491 assert(!record->klass()->is_hidden(), "hidden class cannot be looked up by name");
1492 DEBUG_ONLY(check_klass_after_loading(record->klass());)
1493 // We did not save the classfile data of the generated LambdaForm invoker classes,
1494 // so we cannot support CLFH for such classes.
1495 if (record->klass()->is_generated_shared_class() && JvmtiExport::should_post_class_file_load_hook()) {
1496 return nullptr;
1497 }
1498 return record->klass();
1499 } else {
1500 return nullptr;
1501 }
1502 }
1503
1504 void SystemDictionaryShared::update_shared_entry(InstanceKlass* k, int id) {
1505 assert(CDSConfig::is_dumping_static_archive(), "class ID is used only for static dump (from classlist)");
1506 DumpTimeClassInfo* info = get_info(k);
1507 info->_id = id;
1508 }
1509
1510 const char* SystemDictionaryShared::class_loader_name_for_shared(Klass* k) {
1511 assert(k != nullptr, "Sanity");
1512 assert(k->is_shared(), "Must be");
1513 assert(k->is_instance_klass(), "Must be");
1514 InstanceKlass* ik = InstanceKlass::cast(k);
1515 if (ik->is_shared_boot_class()) {
1516 return "boot_loader";
1517 } else if (ik->is_shared_platform_class()) {
1518 return "platform_loader";
1519 } else if (ik->is_shared_app_class()) {
1520 return "app_loader";
1521 } else if (ik->is_shared_unregistered_class()) {
1522 return "unregistered_loader";
1523 } else {
1524 return "unknown loader";
1525 }
1526 }
1527
1528 class SharedDictionaryPrinter : StackObj {
1529 outputStream* _st;
1530 int _index;
1531 public:
1532 SharedDictionaryPrinter(outputStream* st) : _st(st), _index(0) {}
1533
1534 void do_value(const RunTimeClassInfo* record) {
1535 ResourceMark rm;
1536 _st->print_cr("%4d: %s %s", _index++, record->klass()->external_name(),
1537 SystemDictionaryShared::class_loader_name_for_shared(record->klass()));
1538 if (record->klass()->array_klasses() != nullptr) {
1539 record->klass()->array_klasses()->cds_print_value_on(_st);
1540 _st->cr();
1541 }
1542 }
1543 int index() const { return _index; }
1544 };
1545
1546 class SharedLambdaDictionaryPrinter : StackObj {
1547 outputStream* _st;
1548 int _index;
1549 public:
1550 SharedLambdaDictionaryPrinter(outputStream* st, int idx) : _st(st), _index(idx) {}
1551
1552 void do_value(const RunTimeLambdaProxyClassInfo* record) {
1553 if (record->proxy_klass_head()->lambda_proxy_is_available()) {
1554 ResourceMark rm;
1555 Klass* k = record->proxy_klass_head();
1556 while (k != nullptr) {
1557 _st->print_cr("%4d: %s %s", _index++, k->external_name(),
1558 SystemDictionaryShared::class_loader_name_for_shared(k));
1559 k = k->next_link();
1560 }
1561 }
1562 }
1563 };
1564
1565 void SystemDictionaryShared::ArchiveInfo::print_on(const char* prefix,
1566 outputStream* st) {
1567 st->print_cr("%sShared Dictionary", prefix);
1568 SharedDictionaryPrinter p(st);
1569 st->print_cr("%sShared Builtin Dictionary", prefix);
1570 _builtin_dictionary.iterate(&p);
1571 st->print_cr("%sShared Unregistered Dictionary", prefix);
1572 _unregistered_dictionary.iterate(&p);
1573 if (!_lambda_proxy_class_dictionary.empty()) {
1574 st->print_cr("%sShared Lambda Dictionary", prefix);
1575 SharedLambdaDictionaryPrinter ldp(st, p.index());
1576 _lambda_proxy_class_dictionary.iterate(&ldp);
1577 }
1578 }
1579
1580 void SystemDictionaryShared::ArchiveInfo::print_table_statistics(const char* prefix,
1581 outputStream* st) {
1582 st->print_cr("%sArchve Statistics", prefix);
1583 _builtin_dictionary.print_table_statistics(st, "Builtin Shared Dictionary");
1584 _unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary");
1585 _lambda_proxy_class_dictionary.print_table_statistics(st, "Lambda Shared Dictionary");
1586 }
1587
1588 void SystemDictionaryShared::print_shared_archive(outputStream* st, bool is_static) {
1589 if (CDSConfig::is_using_archive()) {
1590 if (is_static) {
1591 _static_archive.print_on("", st);
1592 } else {
1593 if (DynamicArchive::is_mapped()) {
1594 _dynamic_archive.print_on("Dynamic ", st);
1595 }
1596 }
1597 }
1598 }
1599
1600 void SystemDictionaryShared::print_on(outputStream* st) {
1601 print_shared_archive(st, true);
1602 print_shared_archive(st, false);
1603 }
1604
1605 void SystemDictionaryShared::print_table_statistics(outputStream* st) {
1606 if (CDSConfig::is_using_archive()) {
1607 _static_archive.print_table_statistics("Static ", st);
1608 if (DynamicArchive::is_mapped()) {
1609 _dynamic_archive.print_table_statistics("Dynamic ", st);
1610 }
1611 }
1612 }
1613
1614 bool SystemDictionaryShared::is_dumptime_table_empty() {
1615 assert_lock_strong(DumpTimeTable_lock);
1616 _dumptime_table->update_counts();
1617 if (_dumptime_table->count_of(true) == 0 && _dumptime_table->count_of(false) == 0){
1618 return true;
1619 }
1620 return false;
1621 }
1622
1623 class CleanupDumpTimeLambdaProxyClassTable: StackObj {
1624 public:
1625 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
1626 assert_lock_strong(DumpTimeTable_lock);
1627 InstanceKlass* caller_ik = key.caller_ik();
1628 InstanceKlass* nest_host = caller_ik->nest_host_not_null();
1629
1630 // If the caller class and/or nest_host are excluded, the associated lambda proxy
1631 // must also be excluded.
1632 bool always_exclude = SystemDictionaryShared::check_for_exclusion(caller_ik, nullptr) ||
1633 SystemDictionaryShared::check_for_exclusion(nest_host, nullptr);
1634
1635 for (int i = info._proxy_klasses->length() - 1; i >= 0; i--) {
1636 InstanceKlass* ik = info._proxy_klasses->at(i);
1637 if (always_exclude || SystemDictionaryShared::check_for_exclusion(ik, nullptr)) {
1638 SystemDictionaryShared::reset_registered_lambda_proxy_class(ik);
1639 info._proxy_klasses->remove_at(i);
1640 }
1641 }
1642 return info._proxy_klasses->length() == 0 ? true /* delete the node*/ : false;
1643 }
1644 };
1645
1646 void SystemDictionaryShared::cleanup_lambda_proxy_class_dictionary() {
1647 assert_lock_strong(DumpTimeTable_lock);
1648 CleanupDumpTimeLambdaProxyClassTable cleanup_proxy_classes;
1649 _dumptime_lambda_proxy_class_dictionary->unlink(&cleanup_proxy_classes);
1650 }
1651
1652 void SystemDictionaryShared::create_loader_positive_lookup_cache(TRAPS) {
1653 GrowableArray<InstanceKlass*> shared_classes_list;
1654 {
1655 // With static dumping, we have only a single Java thread (see JVM_StartThread) so
1656 // no no other threads should be loading classes. Otherwise, the code below may miss some
1657 // classes that are loaded concurrently.
1658 assert(CDSConfig::is_dumping_static_archive(), "no other threads should be loading classes");
1659
1660 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
1661 _dumptime_table->iterate_all_classes_in_builtin_loaders([&](InstanceKlass* k, DumpTimeClassInfo& info) {
1662 if (!k->is_hidden() && !check_for_exclusion(k, &info)) {
1663 shared_classes_list.append(k);
1664 }
1665 }
1666 );
1667 }
1668
1669 InstanceKlass* ik = vmClasses::Class_klass();
1670 objArrayOop r = oopFactory::new_objArray(ik, shared_classes_list.length(), CHECK);
1671 objArrayHandle array_h(THREAD, r);
1672
1673 for (int i = 0; i < shared_classes_list.length(); i++) {
1674 oop mirror = shared_classes_list.at(i)->java_mirror();
1675 Handle mirror_h(THREAD, mirror);
1676 array_h->obj_at_put(i, mirror_h());
1677 }
1678
1679 TempNewSymbol method = SymbolTable::new_symbol("generatePositiveLookupCache");
1680 TempNewSymbol signature = SymbolTable::new_symbol("([Ljava/lang/Class;)V");
1681
1682 JavaCallArguments args(Handle(THREAD, SystemDictionary::java_system_loader()));
1683 args.push_oop(array_h);
1684 JavaValue result(T_VOID);
1685 JavaCalls::call_virtual(&result,
1686 vmClasses::jdk_internal_loader_ClassLoaders_AppClassLoader_klass(),
1687 method,
1688 signature,
1689 &args,
1690 CHECK);
1691
1692 if (HAS_PENDING_EXCEPTION) {
1693 Handle exc_handle(THREAD, PENDING_EXCEPTION);
1694 CLEAR_PENDING_EXCEPTION;
1695 ResourceMark rm(THREAD);
1696
1697 log_warning(cds)("Exception during AppClassLoader::generatePositiveLookupCache() call");
1698 LogStreamHandle(Debug, cds) log;
1699 if (log.is_enabled()) {
1700 java_lang_Throwable::print_stack_trace(exc_handle, &log);
1701 }
1702 return;
1703 }
1704 }