1 /*
2 * Copyright (c) 2014, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "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/metaspaceShared.hpp"
38 #include "cds/runTimeClassInfo.hpp"
39 #include "classfile/classFileStream.hpp"
40 #include "classfile/classLoader.hpp"
41 #include "classfile/classLoaderData.inline.hpp"
42 #include "classfile/classLoaderDataGraph.hpp"
43 #include "classfile/classLoaderExt.hpp"
44 #include "classfile/dictionary.hpp"
45 #include "classfile/javaClasses.hpp"
46 #include "classfile/javaClasses.inline.hpp"
47 #include "classfile/symbolTable.hpp"
48 #include "classfile/systemDictionary.hpp"
49 #include "classfile/systemDictionaryShared.hpp"
50 #include "classfile/verificationType.hpp"
51 #include "classfile/vmClasses.hpp"
52 #include "classfile/vmSymbols.hpp"
53 #include "interpreter/bootstrapInfo.hpp"
54 #include "jfr/jfrEvents.hpp"
55 #include "logging/log.hpp"
56 #include "logging/logStream.hpp"
57 #include "memory/allocation.hpp"
58 #include "memory/metadataFactory.hpp"
59 #include "memory/metaspaceClosure.hpp"
60 #include "memory/oopFactory.hpp"
61 #include "memory/resourceArea.hpp"
62 #include "memory/universe.hpp"
63 #include "oops/compressedKlass.inline.hpp"
64 #include "oops/instanceKlass.hpp"
65 #include "oops/klass.inline.hpp"
66 #include "oops/objArrayKlass.hpp"
67 #include "oops/objArrayOop.inline.hpp"
68 #include "oops/oop.inline.hpp"
69 #include "oops/oopHandle.inline.hpp"
70 #include "oops/typeArrayOop.inline.hpp"
71 #include "runtime/arguments.hpp"
72 #include "runtime/handles.inline.hpp"
73 #include "runtime/java.hpp"
74 #include "runtime/javaCalls.hpp"
75 #include "runtime/mutexLocker.hpp"
76 #include "utilities/resourceHash.hpp"
77 #include "utilities/stringUtils.hpp"
78
79 SystemDictionaryShared::ArchiveInfo SystemDictionaryShared::_static_archive;
80 SystemDictionaryShared::ArchiveInfo SystemDictionaryShared::_dynamic_archive;
81
82 DumpTimeSharedClassTable* SystemDictionaryShared::_dumptime_table = nullptr;
83 DumpTimeLambdaProxyClassDictionary* SystemDictionaryShared::_dumptime_lambda_proxy_class_dictionary = nullptr;
84
85 // Used by NoClassLoadingMark
86 DEBUG_ONLY(bool SystemDictionaryShared::_class_loading_may_happen = true;)
87
88 #ifdef ASSERT
89 static void check_klass_after_loading(const Klass* k) {
90 #ifdef _LP64
91 if (k != nullptr && UseCompressedClassPointers && k->needs_narrow_id()) {
92 CompressedKlassPointers::check_encodable(k);
93 }
94 #endif
95 }
96 #endif
97
98 InstanceKlass* SystemDictionaryShared::load_shared_class_for_builtin_loader(
99 Symbol* class_name, Handle class_loader, TRAPS) {
100 assert(CDSConfig::is_using_archive(), "must be");
101 InstanceKlass* ik = find_builtin_class(class_name);
102
103 if (ik != nullptr && !ik->shared_loading_failed()) {
104 if ((SystemDictionary::is_system_class_loader(class_loader()) && ik->is_shared_app_class()) ||
105 (SystemDictionary::is_platform_class_loader(class_loader()) && ik->is_shared_platform_class())) {
106 SharedClassLoadingMark slm(THREAD, ik);
107 PackageEntry* pkg_entry = CDSProtectionDomain::get_package_entry_from_class(ik, class_loader);
108 Handle protection_domain =
109 CDSProtectionDomain::init_security_info(class_loader, ik, pkg_entry, CHECK_NULL);
110 return load_shared_class(ik, class_loader, protection_domain, nullptr, pkg_entry, THREAD);
111 }
112 }
113 return nullptr;
114 }
115
116 // This function is called for loading only UNREGISTERED classes
117 InstanceKlass* SystemDictionaryShared::lookup_from_stream(Symbol* class_name,
118 Handle class_loader,
119 Handle protection_domain,
120 const ClassFileStream* cfs,
121 TRAPS) {
122 if (!CDSConfig::is_using_archive()) {
123 return nullptr;
124 }
125 if (class_name == nullptr) { // don't do this for hidden classes
126 return nullptr;
127 }
128 if (class_loader.is_null() ||
129 SystemDictionary::is_system_class_loader(class_loader()) ||
130 SystemDictionary::is_platform_class_loader(class_loader())) {
131 // Do nothing for the BUILTIN loaders.
132 return nullptr;
133 }
134
135 const RunTimeClassInfo* record = find_record(&_static_archive._unregistered_dictionary,
136 &_dynamic_archive._unregistered_dictionary,
137 class_name);
138 if (record == nullptr) {
139 return nullptr;
140 }
141
142 int clsfile_size = cfs->length();
143 int clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
144
145 if (!record->matches(clsfile_size, clsfile_crc32)) {
146 return nullptr;
147 }
148
149 return acquire_class_for_current_thread(record->klass(), class_loader,
150 protection_domain, cfs,
151 THREAD);
152 }
153
154 InstanceKlass* SystemDictionaryShared::acquire_class_for_current_thread(
155 InstanceKlass *ik,
156 Handle class_loader,
157 Handle protection_domain,
158 const ClassFileStream *cfs,
159 TRAPS) {
160 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader());
161
162 {
163 MutexLocker mu(THREAD, SharedDictionary_lock);
164 if (ik->class_loader_data() != nullptr) {
165 // ik is already loaded (by this loader or by a different loader)
166 // or ik is being loaded by a different thread (by this loader or by a different loader)
167 return nullptr;
168 }
169
170 // No other thread has acquired this yet, so give it to *this thread*
171 ik->set_class_loader_data(loader_data);
172 }
173
174 // No longer holding SharedDictionary_lock
175 // No need to lock, as <ik> can be held only by a single thread.
176 loader_data->add_class(ik);
177
178 // Get the package entry.
179 PackageEntry* pkg_entry = CDSProtectionDomain::get_package_entry_from_class(ik, class_loader);
180
181 // Load and check super/interfaces, restore unshareable info
182 InstanceKlass* shared_klass = load_shared_class(ik, class_loader, protection_domain,
183 cfs, pkg_entry, THREAD);
184 if (shared_klass == nullptr || HAS_PENDING_EXCEPTION) {
185 // TODO: clean up <ik> so it can be used again
186 return nullptr;
187 }
188
189 return shared_klass;
190 }
191
192 // Guaranteed to return non-null value for non-shared classes.
193 // k must not be a shared class.
194 DumpTimeClassInfo* SystemDictionaryShared::get_info(InstanceKlass* k) {
195 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
196 assert(!k->is_shared(), "sanity");
197 return get_info_locked(k);
198 }
199
200 DumpTimeClassInfo* SystemDictionaryShared::get_info_locked(InstanceKlass* k) {
201 assert_lock_strong(DumpTimeTable_lock);
202 assert(!k->is_shared(), "sanity");
203 DumpTimeClassInfo* info = _dumptime_table->get_info(k);
204 assert(info != nullptr, "must be");
205 return info;
206 }
207
208 void SystemDictionaryShared::mark_required_hidden_class(InstanceKlass* k) {
209 assert(k->is_hidden(), "sanity");
210 DumpTimeClassInfo* info = _dumptime_table->get(k);
211 ResourceMark rm;
212 if (info != nullptr) {
213 info->set_is_required_hidden_class();
214 }
215 }
216
217 bool SystemDictionaryShared::check_for_exclusion(InstanceKlass* k, DumpTimeClassInfo* info) {
218 if (MetaspaceShared::is_in_shared_metaspace(k)) {
219 // We have reached a super type that's already in the base archive. Treat it
220 // as "not excluded".
221 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
222 return false;
223 }
224
225 if (info == nullptr) {
226 info = _dumptime_table->get(k);
227 assert(info != nullptr, "supertypes of any classes in _dumptime_table must either be shared, or must also be in _dumptime_table");
228 }
229
230 if (!info->has_checked_exclusion()) {
231 if (check_for_exclusion_impl(k)) {
232 info->set_excluded();
233 }
234 info->set_has_checked_exclusion();
235 }
236
237 return info->is_excluded();
238 }
239
240 // Returns true so the caller can do: return warn_excluded(".....");
241 bool SystemDictionaryShared::warn_excluded(InstanceKlass* k, const char* reason) {
242 ResourceMark rm;
243 log_warning(cds)("Skipping %s: %s", k->name()->as_C_string(), reason);
244 return true;
245 }
246
247 bool SystemDictionaryShared::is_jfr_event_class(InstanceKlass *k) {
248 while (k) {
249 if (k->name()->equals("jdk/internal/event/Event")) {
250 return true;
251 }
252 k = k->java_super();
253 }
254 return false;
255 }
256
257 bool SystemDictionaryShared::is_registered_lambda_proxy_class(InstanceKlass* ik) {
258 DumpTimeClassInfo* info = _dumptime_table->get(ik);
259 return (info != nullptr) ? info->_is_archived_lambda_proxy : false;
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_archived_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 bool SystemDictionaryShared::check_for_exclusion_impl(InstanceKlass* k) {
285 if (k->is_in_error_state()) {
286 return warn_excluded(k, "In error state");
287 }
288 if (k->is_scratch_class()) {
289 return warn_excluded(k, "A scratch class");
290 }
291 if (!k->is_loaded()) {
292 return warn_excluded(k, "Not in loaded state");
293 }
294 if (has_been_redefined(k)) {
295 return warn_excluded(k, "Has been redefined");
296 }
297 if (!k->is_hidden() && k->shared_classpath_index() < 0 && is_builtin(k)) {
298 if (k->name()->starts_with("java/lang/invoke/BoundMethodHandle$Species_")) {
299 // This class is dynamically generated by the JDK
300 if (CDSConfig::is_dumping_aot_linked_classes()) {
301 k->set_shared_classpath_index(0);
302 } else {
303 ResourceMark rm;
304 log_info(cds)("Skipping %s because it is dynamically generated", k->name()->as_C_string());
305 return true; // exclude without warning
306 }
307 } else {
308 // These are classes loaded from unsupported locations (such as those loaded by JVMTI native
309 // agent during dump time).
310 return warn_excluded(k, "Unsupported location");
311 }
312 }
313 if (k->signers() != nullptr) {
314 // We cannot include signed classes in the archive because the certificates
315 // used during dump time may be different than those used during
316 // runtime (due to expiration, etc).
317 return warn_excluded(k, "Signed JAR");
318 }
319 if (is_jfr_event_class(k)) {
320 // We cannot include JFR event classes because they need runtime-specific
321 // instrumentation in order to work with -XX:FlightRecorderOptions:retransform=false.
322 // There are only a small number of these classes, so it's not worthwhile to
323 // support them and make CDS more complicated.
324 return warn_excluded(k, "JFR event class");
325 }
326
327 if (!k->is_linked()) {
328 if (has_class_failed_verification(k)) {
329 return warn_excluded(k, "Failed verification");
330 }
331 } else {
332 if (!k->can_be_verified_at_dumptime()) {
333 // We have an old class that has been linked (e.g., it's been executed during
334 // dump time). This class has been verified using the old verifier, which
335 // doesn't save the verification constraints, so check_verification_constraints()
336 // won't work at runtime.
337 // As a result, we cannot store this class. It must be loaded and fully verified
338 // at runtime.
339 return warn_excluded(k, "Old class has been linked");
340 }
341 }
342
343 if (k->is_hidden() && !should_hidden_class_be_archived(k)) {
344 log_info(cds)("Skipping %s: Hidden class", k->name()->as_C_string());
345 return true;
346 }
347
348 InstanceKlass* super = k->java_super();
349 if (super != nullptr && check_for_exclusion(super, nullptr)) {
350 ResourceMark rm;
351 log_warning(cds)("Skipping %s: super class %s is excluded", k->name()->as_C_string(), super->name()->as_C_string());
352 return true;
353 }
354
355 Array<InstanceKlass*>* interfaces = k->local_interfaces();
356 int len = interfaces->length();
357 for (int i = 0; i < len; i++) {
358 InstanceKlass* intf = interfaces->at(i);
359 if (check_for_exclusion(intf, nullptr)) {
360 ResourceMark rm;
361 log_warning(cds)("Skipping %s: interface %s is excluded", k->name()->as_C_string(), intf->name()->as_C_string());
362 return true;
363 }
364 }
365
366 return false; // false == k should NOT be excluded
367 }
368
369 bool SystemDictionaryShared::is_builtin_loader(ClassLoaderData* loader_data) {
370 oop class_loader = loader_data->class_loader();
371 return (class_loader == nullptr ||
372 SystemDictionary::is_system_class_loader(class_loader) ||
373 SystemDictionary::is_platform_class_loader(class_loader));
374 }
375
376 bool SystemDictionaryShared::has_platform_or_app_classes() {
377 if (FileMapInfo::current_info()->has_platform_or_app_classes()) {
378 return true;
379 }
380 if (DynamicArchive::is_mapped() &&
381 FileMapInfo::dynamic_info()->has_platform_or_app_classes()) {
382 return true;
383 }
384 return false;
385 }
386
387 // The following stack shows how this code is reached:
388 //
389 // [0] SystemDictionaryShared::find_or_load_shared_class()
390 // [1] JVM_FindLoadedClass
391 // [2] java.lang.ClassLoader.findLoadedClass0()
392 // [3] java.lang.ClassLoader.findLoadedClass()
393 // [4] jdk.internal.loader.BuiltinClassLoader.loadClassOrNull()
394 // [5] jdk.internal.loader.BuiltinClassLoader.loadClass()
395 // [6] jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(), or
396 // jdk.internal.loader.ClassLoaders$PlatformClassLoader.loadClass()
397 //
398 // AppCDS supports fast class loading for these 2 built-in class loaders:
399 // jdk.internal.loader.ClassLoaders$PlatformClassLoader
400 // jdk.internal.loader.ClassLoaders$AppClassLoader
401 // with the following assumptions (based on the JDK core library source code):
402 //
403 // [a] these two loaders use the BuiltinClassLoader.loadClassOrNull() to
404 // load the named class.
405 // [b] BuiltinClassLoader.loadClassOrNull() first calls findLoadedClass(name).
406 // [c] At this point, if we can find the named class inside the
407 // shared_dictionary, we can perform further checks (see
408 // SystemDictionary::is_shared_class_visible) to ensure that this class
409 // was loaded by the same class loader during dump time.
410 //
411 // Given these assumptions, we intercept the findLoadedClass() call to invoke
412 // SystemDictionaryShared::find_or_load_shared_class() to load the shared class from
413 // the archive for the 2 built-in class loaders. This way,
414 // we can improve start-up because we avoid decoding the classfile,
415 // and avoid delegating to the parent loader.
416 //
417 // NOTE: there's a lot of assumption about the Java code. If any of that change, this
418 // needs to be redesigned.
419
420 InstanceKlass* SystemDictionaryShared::find_or_load_shared_class(
421 Symbol* name, Handle class_loader, TRAPS) {
422 InstanceKlass* k = nullptr;
423 if (CDSConfig::is_using_archive()) {
424 if (!has_platform_or_app_classes()) {
425 return nullptr;
426 }
427
428 if (SystemDictionary::is_system_class_loader(class_loader()) ||
429 SystemDictionary::is_platform_class_loader(class_loader())) {
430 ClassLoaderData *loader_data = register_loader(class_loader);
431 Dictionary* dictionary = loader_data->dictionary();
432
433 // Note: currently, find_or_load_shared_class is called only from
434 // JVM_FindLoadedClass and used for PlatformClassLoader and AppClassLoader,
435 // which are parallel-capable loaders, so a lock here is NOT taken.
436 assert(get_loader_lock_or_null(class_loader) == nullptr, "ObjectLocker not required");
437 {
438 MutexLocker mu(THREAD, SystemDictionary_lock);
439 InstanceKlass* check = dictionary->find_class(THREAD, name);
440 if (check != nullptr) {
441 return check;
442 }
443 }
444
445 k = load_shared_class_for_builtin_loader(name, class_loader, THREAD);
446 if (k != nullptr) {
447 SharedClassLoadingMark slm(THREAD, k);
448 k = find_or_define_instance_class(name, class_loader, k, CHECK_NULL);
449 }
450 }
451 }
452
453 DEBUG_ONLY(check_klass_after_loading(k);)
454
455 return k;
456 }
457
458 class UnregisteredClassesTable : public ResourceHashtable<
459 Symbol*, InstanceKlass*,
460 15889, // prime number
461 AnyObj::C_HEAP> {};
462
463 static UnregisteredClassesTable* _unregistered_classes_table = nullptr;
464
465 // true == class was successfully added; false == a duplicated class (with the same name) already exists.
466 bool SystemDictionaryShared::add_unregistered_class(Thread* current, InstanceKlass* klass) {
467 // We don't allow duplicated unregistered classes with the same name.
468 // We only archive the first class with that name that succeeds putting
469 // itself into the table.
470 assert(CDSConfig::is_dumping_archive() || ClassListWriter::is_enabled(), "sanity");
471 MutexLocker ml(current, UnregisteredClassesTable_lock, Mutex::_no_safepoint_check_flag);
472 Symbol* name = klass->name();
473 if (_unregistered_classes_table == nullptr) {
474 _unregistered_classes_table = new (mtClass)UnregisteredClassesTable();
475 }
476 bool created;
477 InstanceKlass** v = _unregistered_classes_table->put_if_absent(name, klass, &created);
478 if (created) {
479 name->increment_refcount();
480 }
481 return (klass == *v);
482 }
483
484 // This function is called to lookup the super/interfaces of shared classes for
485 // unregistered loaders. E.g., SharedClass in the below example
486 // where "super:" (and optionally "interface:") have been specified.
487 //
488 // java/lang/Object id: 0
489 // Interface id: 2 super: 0 source: cust.jar
490 // SharedClass id: 4 super: 0 interfaces: 2 source: cust.jar
491 InstanceKlass* SystemDictionaryShared::lookup_super_for_unregistered_class(
492 Symbol* class_name, Symbol* super_name, bool is_superclass) {
493
494 assert(CDSConfig::is_dumping_static_archive(), "only when static dumping");
495
496 if (!ClassListParser::is_parsing_thread()) {
497 // Unregistered classes can be created only by ClassListParser::_parsing_thread.
498
499 return nullptr;
500 }
501
502 ClassListParser* parser = ClassListParser::instance();
503 if (parser == nullptr) {
504 // We're still loading the well-known classes, before the ClassListParser is created.
505 return nullptr;
506 }
507 if (class_name->equals(parser->current_class_name())) {
508 // When this function is called, all the numbered super and interface types
509 // must have already been loaded. Hence this function is never recursively called.
510 if (is_superclass) {
511 return parser->lookup_super_for_current_class(super_name);
512 } else {
513 return parser->lookup_interface_for_current_class(super_name);
514 }
515 } else {
516 // The VM is not trying to resolve a super type of parser->current_class_name().
517 // Instead, it's resolving an error class (because parser->current_class_name() has
518 // failed parsing or verification). Don't do anything here.
519 return nullptr;
520 }
521 }
522
523 void SystemDictionaryShared::set_shared_class_misc_info(InstanceKlass* k, ClassFileStream* cfs) {
524 assert(CDSConfig::is_dumping_archive(), "sanity");
525 assert(!is_builtin(k), "must be unregistered class");
526 DumpTimeClassInfo* info = get_info(k);
527 info->_clsfile_size = cfs->length();
528 info->_clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
529 }
530
531 void SystemDictionaryShared::initialize() {
532 if (CDSConfig::is_dumping_archive()) {
533 _dumptime_table = new (mtClass) DumpTimeSharedClassTable;
534 _dumptime_lambda_proxy_class_dictionary =
535 new (mtClass) DumpTimeLambdaProxyClassDictionary;
536 }
537 }
538
539 void SystemDictionaryShared::init_dumptime_info(InstanceKlass* k) {
540 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
541 assert(SystemDictionaryShared::class_loading_may_happen(), "sanity");
542 _dumptime_table->allocate_info(k);
543 }
544
545 void SystemDictionaryShared::remove_dumptime_info(InstanceKlass* k) {
546 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
547 _dumptime_table->remove(k);
548 }
549
550 void SystemDictionaryShared::handle_class_unloading(InstanceKlass* klass) {
551 if (CDSConfig::is_dumping_archive()) {
552 remove_dumptime_info(klass);
553 }
554
555 if (CDSConfig::is_dumping_archive() || ClassListWriter::is_enabled()) {
556 MutexLocker ml(Thread::current(), UnregisteredClassesTable_lock, Mutex::_no_safepoint_check_flag);
557 if (_unregistered_classes_table != nullptr) {
558 // Remove the class from _unregistered_classes_table: keep the entry but
559 // set it to null. This ensure no classes with the same name can be
560 // added again.
561 InstanceKlass** v = _unregistered_classes_table->get(klass->name());
562 if (v != nullptr) {
563 *v = nullptr;
564 }
565 }
566 } else {
567 assert(_unregistered_classes_table == nullptr, "must not be used");
568 }
569
570 if (ClassListWriter::is_enabled()) {
571 ClassListWriter cw;
572 cw.handle_class_unloading((const InstanceKlass*)klass);
573 }
574 }
575
576 // Check if a class or any of its supertypes has been redefined.
577 bool SystemDictionaryShared::has_been_redefined(InstanceKlass* k) {
578 if (k->has_been_redefined()) {
579 return true;
580 }
581 if (k->java_super() != nullptr && has_been_redefined(k->java_super())) {
582 return true;
583 }
584 Array<InstanceKlass*>* interfaces = k->local_interfaces();
585 int len = interfaces->length();
586 for (int i = 0; i < len; i++) {
587 if (has_been_redefined(interfaces->at(i))) {
588 return true;
589 }
590 }
591 return false;
592 }
593
594 // k is a class before relocating by ArchiveBuilder
595 void SystemDictionaryShared::validate_before_archiving(InstanceKlass* k) {
596 ResourceMark rm;
597 const char* name = k->name()->as_C_string();
598 DumpTimeClassInfo* info = _dumptime_table->get(k);
599 assert(!class_loading_may_happen(), "class loading must be disabled");
600 guarantee(info != nullptr, "Class %s must be entered into _dumptime_table", name);
601 guarantee(!info->is_excluded(), "Should not attempt to archive excluded class %s", name);
602 if (is_builtin(k)) {
603 if (k->is_hidden()) {
604 if (CDSConfig::is_dumping_invokedynamic()) {
605 assert(should_hidden_class_be_archived(k), "unexpected hidden class %s", name);
606 } else {
607 assert(is_registered_lambda_proxy_class(k), "unexpected hidden class %s", name);
608 }
609 }
610 guarantee(!k->is_shared_unregistered_class(),
611 "Class loader type must be set for BUILTIN class %s", name);
612
613 } else {
614 guarantee(k->is_shared_unregistered_class(),
615 "Class loader type must not be set for UNREGISTERED class %s", name);
616 }
617 }
618
619 class UnregisteredClassesDuplicationChecker : StackObj {
620 GrowableArray<InstanceKlass*> _list;
621 Thread* _thread;
622 public:
623 UnregisteredClassesDuplicationChecker() : _thread(Thread::current()) {}
624
625 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
626 if (!SystemDictionaryShared::is_builtin(k)) {
627 _list.append(k);
628 }
629 }
630
631 static int compare_by_loader(InstanceKlass** a, InstanceKlass** b) {
632 ClassLoaderData* loader_a = a[0]->class_loader_data();
633 ClassLoaderData* loader_b = b[0]->class_loader_data();
634
635 if (loader_a != loader_b) {
636 return primitive_compare(loader_a, loader_b);
637 } else {
638 return primitive_compare(a[0], b[0]);
639 }
640 }
641
642 void mark_duplicated_classes() {
643 // Two loaders may load two identical or similar hierarchies of classes. If we
644 // check for duplication in random order, we may end up excluding important base classes
645 // in both hierarchies, causing most of the classes to be excluded.
646 // We sort the classes by their loaders. This way we're likely to archive
647 // all classes in the one of the two hierarchies.
648 _list.sort(compare_by_loader);
649 for (int i = 0; i < _list.length(); i++) {
650 InstanceKlass* k = _list.at(i);
651 bool i_am_first = SystemDictionaryShared::add_unregistered_class(_thread, k);
652 if (!i_am_first) {
653 SystemDictionaryShared::warn_excluded(k, "Duplicated unregistered class");
654 SystemDictionaryShared::set_excluded_locked(k);
655 }
656 }
657 }
658 };
659
660 void SystemDictionaryShared::scan_constant_pool(InstanceKlass* k) {
661 if (CDSConfig::is_dumping_invokedynamic()) {
662 k->constants()->find_required_hidden_classes();
663 }
664 }
665
666 bool SystemDictionaryShared::should_hidden_class_be_archived(InstanceKlass* k) {
667 assert(k->is_hidden(), "sanity");
668 if (is_registered_lambda_proxy_class(k)) {
669 return true;
670 }
671
672 if (CDSConfig::is_dumping_invokedynamic()) {
673 DumpTimeClassInfo* info = _dumptime_table->get(k);
674 if (info != nullptr && info->is_required_hidden_class()) {
675 guarantee(HeapShared::is_archivable_hidden_klass(k), "required hidden class must be archivable");
676 return true;
677 }
678 }
679
680 return false;
681 }
682
683 // Returns true if the class should be excluded. This can be called by
684 // AOTConstantPoolResolver before or after we enter the CDS safepoint.
685 // When called before the safepoint, we need to link the class so that
686 // it can be checked by check_for_exclusion().
687 bool SystemDictionaryShared::should_be_excluded(Klass* k) {
688 assert(CDSConfig::is_dumping_archive(), "sanity");
689 assert(CDSConfig::current_thread_is_vm_or_dumper(), "sanity");
690
691 if (k->is_objArray_klass()) {
692 return should_be_excluded(ObjArrayKlass::cast(k)->bottom_klass());
693 }
694
695 if (!k->is_instance_klass()) {
696 return false;
697 } else {
698 InstanceKlass* ik = InstanceKlass::cast(k);
699
700 if (!SafepointSynchronize::is_at_safepoint()) {
701 if (!ik->is_linked()) {
702 // check_for_exclusion() below doesn't link unlinked classes. We come
703 // here only when we are trying to aot-link constant pool entries, so
704 // we'd better link the class.
705 JavaThread* THREAD = JavaThread::current();
706 ik->link_class(THREAD);
707 if (HAS_PENDING_EXCEPTION) {
708 CLEAR_PENDING_EXCEPTION;
709 return true; // linking failed -- let's exclude it
710 }
711 }
712
713 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
714 DumpTimeClassInfo* p = get_info_locked(ik);
715 if (p->is_excluded()) {
716 return true;
717 }
718 return check_for_exclusion(ik, p);
719 } else {
720 // No need to check for is_linked() as all eligible classes should have
721 // already been linked in MetaspaceShared::link_class_for_cds().
722 // Can't take the lock as we are in safepoint.
723 DumpTimeClassInfo* p = _dumptime_table->get(ik);
724 if (p->is_excluded()) {
725 return true;
726 }
727 return check_for_exclusion(ik, p);
728 }
729 }
730 }
731
732 void SystemDictionaryShared::find_all_archivable_classes() {
733 HeapShared::start_finding_required_hidden_classes();
734 find_all_archivable_classes_impl();
735 HeapShared::end_finding_required_hidden_classes();
736 }
737
738 // Iterate over all the classes in _dumptime_table, marking the ones that must be
739 // excluded from the archive. Those that are not excluded will be archivable.
740 //
741 // (a) Non-hidden classes are easy. They are only check by the rules in
742 // SystemDictionaryShared::check_for_exclusion().
743 // (b) For hidden classes, we only archive those that are required (i.e., they are
744 // referenced by Java objects (such as CallSites) that are reachable from
745 // ConstantPools). This needs help from HeapShared.
746 void SystemDictionaryShared::find_all_archivable_classes_impl() {
747 assert(!class_loading_may_happen(), "class loading must be disabled");
748 assert_lock_strong(DumpTimeTable_lock);
749
750 if (CDSConfig::is_dumping_dynamic_archive()) {
751 // Do this first -- if a base class is excluded due to duplication,
752 // all of its subclasses will also be excluded.
753 ResourceMark rm;
754 UnregisteredClassesDuplicationChecker dup_checker;
755 _dumptime_table->iterate_all_live_classes(&dup_checker);
756 dup_checker.mark_duplicated_classes();
757 }
758
759 ResourceMark rm;
760
761 // First, scan all non-hidden classes
762 auto check_non_hidden = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
763 if (!k->is_hidden()) {
764 SystemDictionaryShared::check_for_exclusion(k, &info);
765 if (!info.is_excluded() && !info.has_scanned_constant_pool()) {
766 scan_constant_pool(k);
767 info.set_has_scanned_constant_pool();
768 }
769 }
770 };
771 _dumptime_table->iterate_all_live_classes(check_non_hidden);
772
773 // Then, scan all the hidden classes that have been marked as required to
774 // discover more hidden classes. Stop when we cannot make progress anymore.
775 bool made_progress;
776 do {
777 made_progress = false;
778 auto check_hidden = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
779 if (k->is_hidden() && should_hidden_class_be_archived(k)) {
780 SystemDictionaryShared::check_for_exclusion(k, &info);
781 if (info.is_excluded()) {
782 guarantee(!info.is_required_hidden_class(), "A required hidden class cannot be marked as excluded");
783 } else if (!info.has_scanned_constant_pool()) {
784 scan_constant_pool(k);
785 info.set_has_scanned_constant_pool();
786 // The CP entries in k *MAY* refer to other hidden classes, so scan
787 // every hidden class again.
788 made_progress = true;
789 }
790 }
791 };
792 _dumptime_table->iterate_all_live_classes(check_hidden);
793 } while (made_progress);
794
795 // Now, all hidden classes that have not yet been scanned must be marked as excluded
796 auto exclude_remaining_hidden = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
797 if (k->is_hidden()) {
798 SystemDictionaryShared::check_for_exclusion(k, &info);
799 if (CDSConfig::is_dumping_invokedynamic()) {
800 if (should_hidden_class_be_archived(k)) {
801 guarantee(!info.is_excluded(), "Must be");
802 } else {
803 guarantee(info.is_excluded(), "Must be");
804 }
805 }
806 }
807 };
808 _dumptime_table->iterate_all_live_classes(exclude_remaining_hidden);
809 _dumptime_table->update_counts();
810
811 cleanup_lambda_proxy_class_dictionary();
812 }
813
814 bool SystemDictionaryShared::is_excluded_class(InstanceKlass* k) {
815 assert(!class_loading_may_happen(), "class loading must be disabled");
816 assert_lock_strong(DumpTimeTable_lock);
817 assert(CDSConfig::is_dumping_archive(), "sanity");
818 DumpTimeClassInfo* p = get_info_locked(k);
819 return p->is_excluded();
820 }
821
822 void SystemDictionaryShared::set_excluded_locked(InstanceKlass* k) {
823 assert_lock_strong(DumpTimeTable_lock);
824 assert(CDSConfig::is_dumping_archive(), "sanity");
825 DumpTimeClassInfo* info = get_info_locked(k);
826 info->set_excluded();
827 }
828
829 void SystemDictionaryShared::set_excluded(InstanceKlass* k) {
830 assert(CDSConfig::is_dumping_archive(), "sanity");
831 DumpTimeClassInfo* info = get_info(k);
832 info->set_excluded();
833 }
834
835 void SystemDictionaryShared::set_class_has_failed_verification(InstanceKlass* ik) {
836 assert(CDSConfig::is_dumping_archive(), "sanity");
837 DumpTimeClassInfo* p = get_info(ik);
838 p->set_failed_verification();
839 }
840
841 bool SystemDictionaryShared::has_class_failed_verification(InstanceKlass* ik) {
842 assert(CDSConfig::is_dumping_archive(), "sanity");
843 DumpTimeClassInfo* p = _dumptime_table->get(ik);
844 return (p == nullptr) ? false : p->failed_verification();
845 }
846
847 void SystemDictionaryShared::dumptime_classes_do(class MetaspaceClosure* it) {
848 assert_lock_strong(DumpTimeTable_lock);
849
850 auto do_klass = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
851 if (k->is_loader_alive() && !info.is_excluded()) {
852 info.metaspace_pointers_do(it);
853 }
854 };
855 _dumptime_table->iterate_all_live_classes(do_klass);
856
857 auto do_lambda = [&] (LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
858 if (key.caller_ik()->is_loader_alive()) {
859 info.metaspace_pointers_do(it);
860 key.metaspace_pointers_do(it);
861 }
862 };
863 _dumptime_lambda_proxy_class_dictionary->iterate_all(do_lambda);
864 }
865
866 bool SystemDictionaryShared::add_verification_constraint(InstanceKlass* k, Symbol* name,
867 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) {
868 assert(CDSConfig::is_dumping_archive(), "sanity");
869 DumpTimeClassInfo* info = get_info(k);
870 info->add_verification_constraint(k, name, from_name, from_field_is_protected,
871 from_is_array, from_is_object);
872
873 if (CDSConfig::is_dumping_dynamic_archive()) {
874 // For dynamic dumping, we can resolve all the constraint classes for all class loaders during
875 // the initial run prior to creating the archive before vm exit. We will also perform verification
876 // check when running with the archive.
877 return false;
878 } else {
879 if (is_builtin(k)) {
880 // For builtin class loaders, we can try to complete the verification check at dump time,
881 // because we can resolve all the constraint classes. We will also perform verification check
882 // when running with the archive.
883 return false;
884 } else {
885 // For non-builtin class loaders, we cannot complete the verification check at dump time,
886 // because at dump time we don't know how to resolve classes for such loaders.
887 return true;
888 }
889 }
890 }
891
892 void SystemDictionaryShared::add_enum_klass_static_field(InstanceKlass* ik, int root_index) {
893 assert(CDSConfig::is_dumping_heap(), "sanity");
894 DumpTimeClassInfo* info = get_info_locked(ik);
895 info->add_enum_klass_static_field(root_index);
896 }
897
898 void SystemDictionaryShared::add_to_dump_time_lambda_proxy_class_dictionary(LambdaProxyClassKey& key,
899 InstanceKlass* proxy_klass) {
900 assert_lock_strong(DumpTimeTable_lock);
901
902 bool created;
903 DumpTimeLambdaProxyClassInfo* info = _dumptime_lambda_proxy_class_dictionary->put_if_absent(key, &created);
904 info->add_proxy_klass(proxy_klass);
905 if (created) {
906 ++_dumptime_lambda_proxy_class_dictionary->_count;
907 }
908 }
909
910 void SystemDictionaryShared::add_lambda_proxy_class(InstanceKlass* caller_ik,
911 InstanceKlass* lambda_ik,
912 Symbol* invoked_name,
913 Symbol* invoked_type,
914 Symbol* method_type,
915 Method* member_method,
916 Symbol* instantiated_method_type,
917 TRAPS) {
918 if (CDSConfig::is_dumping_invokedynamic()) {
919 // The lambda proxy classes will be stored as part of aot-resolved constant pool entries.
920 // There's no need to remember them in a separate table.
921 return;
922 }
923
924 assert(caller_ik->class_loader() == lambda_ik->class_loader(), "mismatched class loader");
925 assert(caller_ik->class_loader_data() == lambda_ik->class_loader_data(), "mismatched class loader data");
926 assert(java_lang_Class::class_data(lambda_ik->java_mirror()) == nullptr, "must not have class data");
927
928 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
929
930 lambda_ik->assign_class_loader_type();
931 lambda_ik->set_shared_classpath_index(caller_ik->shared_classpath_index());
932 InstanceKlass* nest_host = caller_ik->nest_host(CHECK);
933 assert(nest_host != nullptr, "unexpected nullptr nest_host");
934
935 DumpTimeClassInfo* info = _dumptime_table->get(lambda_ik);
936 if (info != nullptr && !lambda_ik->is_non_strong_hidden() && is_builtin(lambda_ik) && is_builtin(caller_ik)
937 // Don't include the lambda proxy if its nest host is not in the "linked" state.
938 && nest_host->is_linked()) {
939 // Set _is_archived_lambda_proxy in DumpTimeClassInfo so that the lambda_ik
940 // won't be excluded during dumping of shared archive. See ExcludeDumpTimeSharedClasses.
941 info->_is_archived_lambda_proxy = true;
942 info->set_nest_host(nest_host);
943
944 LambdaProxyClassKey key(caller_ik,
945 invoked_name,
946 invoked_type,
947 method_type,
948 member_method,
949 instantiated_method_type);
950 add_to_dump_time_lambda_proxy_class_dictionary(key, lambda_ik);
951 }
952 }
953
954 InstanceKlass* SystemDictionaryShared::get_shared_lambda_proxy_class(InstanceKlass* caller_ik,
955 Symbol* invoked_name,
956 Symbol* invoked_type,
957 Symbol* method_type,
958 Method* member_method,
959 Symbol* instantiated_method_type) {
960 assert(caller_ik != nullptr, "sanity");
961 assert(invoked_name != nullptr, "sanity");
962 assert(invoked_type != nullptr, "sanity");
963 assert(method_type != nullptr, "sanity");
964 assert(instantiated_method_type != nullptr, "sanity");
965
966 if (!caller_ik->is_shared() ||
967 !invoked_name->is_shared() ||
968 !invoked_type->is_shared() ||
969 !method_type->is_shared() ||
970 (member_method != nullptr && !member_method->is_shared()) ||
971 !instantiated_method_type->is_shared()) {
972 // These can't be represented as u4 offset, but we wouldn't have archived a lambda proxy in this case anyway.
973 return nullptr;
974 }
975
976 MutexLocker ml(CDSLambda_lock, Mutex::_no_safepoint_check_flag);
977 RunTimeLambdaProxyClassKey key =
978 RunTimeLambdaProxyClassKey::init_for_runtime(caller_ik, invoked_name, invoked_type,
979 method_type, member_method, instantiated_method_type);
980
981 // Try to retrieve the lambda proxy class from static archive.
982 const RunTimeLambdaProxyClassInfo* info = _static_archive.lookup_lambda_proxy_class(&key);
983 InstanceKlass* proxy_klass = retrieve_lambda_proxy_class(info);
984 if (proxy_klass == nullptr) {
985 if (info != nullptr && log_is_enabled(Debug, cds)) {
986 ResourceMark rm;
987 log_debug(cds)("Used all static archived lambda proxy classes for: %s %s%s",
988 caller_ik->external_name(), invoked_name->as_C_string(), invoked_type->as_C_string());
989 }
990 } else {
991 return proxy_klass;
992 }
993
994 // Retrieving from static archive is unsuccessful, try dynamic archive.
995 info = _dynamic_archive.lookup_lambda_proxy_class(&key);
996 proxy_klass = retrieve_lambda_proxy_class(info);
997 if (proxy_klass == nullptr) {
998 if (info != nullptr && log_is_enabled(Debug, cds)) {
999 ResourceMark rm;
1000 log_debug(cds)("Used all dynamic archived lambda proxy classes for: %s %s%s",
1001 caller_ik->external_name(), invoked_name->as_C_string(), invoked_type->as_C_string());
1002 }
1003 }
1004 return proxy_klass;
1005 }
1006
1007 InstanceKlass* SystemDictionaryShared::retrieve_lambda_proxy_class(const RunTimeLambdaProxyClassInfo* info) {
1008 InstanceKlass* proxy_klass = nullptr;
1009 if (info != nullptr) {
1010 InstanceKlass* curr_klass = info->proxy_klass_head();
1011 InstanceKlass* prev_klass = curr_klass;
1012 if (curr_klass->lambda_proxy_is_available()) {
1013 while (curr_klass->next_link() != nullptr) {
1014 prev_klass = curr_klass;
1015 curr_klass = InstanceKlass::cast(curr_klass->next_link());
1016 }
1017 assert(curr_klass->is_hidden(), "must be");
1018 assert(curr_klass->lambda_proxy_is_available(), "must be");
1019
1020 prev_klass->set_next_link(nullptr);
1021 proxy_klass = curr_klass;
1022 proxy_klass->clear_lambda_proxy_is_available();
1023 if (log_is_enabled(Debug, cds)) {
1024 ResourceMark rm;
1025 log_debug(cds)("Loaded lambda proxy: %s ", proxy_klass->external_name());
1026 }
1027 }
1028 }
1029 return proxy_klass;
1030 }
1031
1032 InstanceKlass* SystemDictionaryShared::get_shared_nest_host(InstanceKlass* lambda_ik) {
1033 assert(!CDSConfig::is_dumping_static_archive() && CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
1034 RunTimeClassInfo* record = RunTimeClassInfo::get_for(lambda_ik);
1035 return record->nest_host();
1036 }
1037
1038 InstanceKlass* SystemDictionaryShared::prepare_shared_lambda_proxy_class(InstanceKlass* lambda_ik,
1039 InstanceKlass* caller_ik, TRAPS) {
1040 Handle class_loader(THREAD, caller_ik->class_loader());
1041 Handle protection_domain;
1042 PackageEntry* pkg_entry = caller_ik->package();
1043 if (caller_ik->class_loader() != nullptr) {
1044 protection_domain = CDSProtectionDomain::init_security_info(class_loader, caller_ik, pkg_entry, CHECK_NULL);
1045 }
1046
1047 InstanceKlass* shared_nest_host = get_shared_nest_host(lambda_ik);
1048 assert(shared_nest_host != nullptr, "unexpected nullptr _nest_host");
1049
1050 InstanceKlass* loaded_lambda =
1051 SystemDictionary::load_shared_lambda_proxy_class(lambda_ik, class_loader, protection_domain, pkg_entry, CHECK_NULL);
1052
1053 if (loaded_lambda == nullptr) {
1054 return nullptr;
1055 }
1056
1057 // Ensures the nest host is the same as the lambda proxy's
1058 // nest host recorded at dump time.
1059 InstanceKlass* nest_host = caller_ik->nest_host(THREAD);
1060 assert(nest_host == shared_nest_host, "mismatched nest host");
1061
1062 EventClassLoad class_load_start_event;
1063
1064 // Add to class hierarchy, and do possible deoptimizations.
1065 loaded_lambda->add_to_hierarchy(THREAD);
1066 // But, do not add to dictionary.
1067
1068 loaded_lambda->link_class(CHECK_NULL);
1069 // notify jvmti
1070 if (JvmtiExport::should_post_class_load()) {
1071 JvmtiExport::post_class_load(THREAD, loaded_lambda);
1072 }
1073 if (class_load_start_event.should_commit()) {
1074 SystemDictionary::post_class_load_event(&class_load_start_event, loaded_lambda, ClassLoaderData::class_loader_data(class_loader()));
1075 }
1076
1077 loaded_lambda->initialize(CHECK_NULL);
1078
1079 return loaded_lambda;
1080 }
1081
1082 void SystemDictionaryShared::check_verification_constraints(InstanceKlass* klass,
1083 TRAPS) {
1084 assert(!CDSConfig::is_dumping_static_archive() && CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
1085 RunTimeClassInfo* record = RunTimeClassInfo::get_for(klass);
1086
1087 int length = record->num_verifier_constraints();
1088 if (length > 0) {
1089 for (int i = 0; i < length; i++) {
1090 RunTimeClassInfo::RTVerifierConstraint* vc = record->verifier_constraint_at(i);
1091 Symbol* name = vc->name();
1092 Symbol* from_name = vc->from_name();
1093 char c = record->verifier_constraint_flag(i);
1094
1095 if (log_is_enabled(Trace, cds, verification)) {
1096 ResourceMark rm(THREAD);
1097 log_trace(cds, verification)("check_verification_constraint: %s: %s must be subclass of %s [0x%x]",
1098 klass->external_name(), from_name->as_klass_external_name(),
1099 name->as_klass_external_name(), c);
1100 }
1101
1102 bool from_field_is_protected = (c & SystemDictionaryShared::FROM_FIELD_IS_PROTECTED) ? true : false;
1103 bool from_is_array = (c & SystemDictionaryShared::FROM_IS_ARRAY) ? true : false;
1104 bool from_is_object = (c & SystemDictionaryShared::FROM_IS_OBJECT) ? true : false;
1105
1106 bool ok = VerificationType::resolve_and_check_assignability(klass, name,
1107 from_name, from_field_is_protected, from_is_array, from_is_object, CHECK);
1108 if (!ok) {
1109 ResourceMark rm(THREAD);
1110 stringStream ss;
1111
1112 ss.print_cr("Bad type on operand stack");
1113 ss.print_cr("Exception Details:");
1114 ss.print_cr(" Location:\n %s", klass->name()->as_C_string());
1115 ss.print_cr(" Reason:\n Type '%s' is not assignable to '%s'",
1116 from_name->as_quoted_ascii(), name->as_quoted_ascii());
1117 THROW_MSG(vmSymbols::java_lang_VerifyError(), ss.as_string());
1118 }
1119 }
1120 }
1121 }
1122
1123 static oop get_class_loader_by(char type) {
1124 if (type == (char)ClassLoader::BOOT_LOADER) {
1125 return (oop)nullptr;
1126 } else if (type == (char)ClassLoader::PLATFORM_LOADER) {
1127 return SystemDictionary::java_platform_loader();
1128 } else {
1129 assert (type == (char)ClassLoader::APP_LOADER, "Sanity");
1130 return SystemDictionary::java_system_loader();
1131 }
1132 }
1133
1134 // Record class loader constraints that are checked inside
1135 // InstanceKlass::link_class(), so that these can be checked quickly
1136 // at runtime without laying out the vtable/itables.
1137 void SystemDictionaryShared::record_linking_constraint(Symbol* name, InstanceKlass* klass,
1138 Handle loader1, Handle loader2) {
1139 // A linking constraint check is executed when:
1140 // - klass extends or implements type S
1141 // - klass overrides method S.M(...) with X.M
1142 // - If klass defines the method M, X is
1143 // the same as klass.
1144 // - If klass does not define the method M,
1145 // X must be a supertype of klass and X.M is
1146 // a default method defined by X.
1147 // - loader1 = X->class_loader()
1148 // - loader2 = S->class_loader()
1149 // - loader1 != loader2
1150 // - M's parameter(s) include an object type T
1151 // We require that
1152 // - whenever loader1 and loader2 try to
1153 // resolve the type T, they must always resolve to
1154 // the same InstanceKlass.
1155 // NOTE: type T may or may not be currently resolved in
1156 // either of these two loaders. The check itself does not
1157 // try to resolve T.
1158 oop klass_loader = klass->class_loader();
1159
1160 if (!is_system_class_loader(klass_loader) &&
1161 !is_platform_class_loader(klass_loader)) {
1162 // If klass is loaded by system/platform loaders, we can
1163 // guarantee that klass and S must be loaded by the same
1164 // respective loader between dump time and run time, and
1165 // the exact same check on (name, loader1, loader2) will
1166 // be executed. Hence, we can cache this check and execute
1167 // it at runtime without walking the vtable/itables.
1168 //
1169 // This cannot be guaranteed for classes loaded by other
1170 // loaders, so we bail.
1171 return;
1172 }
1173
1174 assert(is_builtin(klass), "must be");
1175 assert(klass_loader != nullptr, "should not be called for boot loader");
1176 assert(loader1 != loader2, "must be");
1177
1178 if (CDSConfig::is_dumping_dynamic_archive() && Thread::current()->is_VM_thread()) {
1179 // We are re-laying out the vtable/itables of the *copy* of
1180 // a class during the final stage of dynamic dumping. The
1181 // linking constraints for this class has already been recorded.
1182 return;
1183 }
1184 assert(!Thread::current()->is_VM_thread(), "must be");
1185
1186 assert(CDSConfig::is_dumping_archive(), "sanity");
1187 DumpTimeClassInfo* info = get_info(klass);
1188 info->record_linking_constraint(name, loader1, loader2);
1189 }
1190
1191 // returns true IFF there's no need to re-initialize the i/v-tables for klass for
1192 // the purpose of checking class loader constraints.
1193 bool SystemDictionaryShared::check_linking_constraints(Thread* current, InstanceKlass* klass) {
1194 assert(!CDSConfig::is_dumping_static_archive() && CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
1195 LogTarget(Info, class, loader, constraints) log;
1196 if (klass->is_shared_boot_class()) {
1197 // No class loader constraint check performed for boot classes.
1198 return true;
1199 }
1200 if (klass->is_shared_platform_class() || klass->is_shared_app_class()) {
1201 RunTimeClassInfo* info = RunTimeClassInfo::get_for(klass);
1202 assert(info != nullptr, "Sanity");
1203 if (info->num_loader_constraints() > 0) {
1204 HandleMark hm(current);
1205 for (int i = 0; i < info->num_loader_constraints(); i++) {
1206 RunTimeClassInfo::RTLoaderConstraint* lc = info->loader_constraint_at(i);
1207 Symbol* name = lc->constraint_name();
1208 Handle loader1(current, get_class_loader_by(lc->_loader_type1));
1209 Handle loader2(current, get_class_loader_by(lc->_loader_type2));
1210 if (log.is_enabled()) {
1211 ResourceMark rm(current);
1212 log.print("[CDS add loader constraint for class %s symbol %s loader[0] %s loader[1] %s",
1213 klass->external_name(), name->as_C_string(),
1214 ClassLoaderData::class_loader_data(loader1())->loader_name_and_id(),
1215 ClassLoaderData::class_loader_data(loader2())->loader_name_and_id());
1216 }
1217 if (!SystemDictionary::add_loader_constraint(name, klass, loader1, loader2)) {
1218 // Loader constraint violation has been found. The caller
1219 // will re-layout the vtable/itables to produce the correct
1220 // exception.
1221 if (log.is_enabled()) {
1222 log.print(" failed]");
1223 }
1224 return false;
1225 }
1226 if (log.is_enabled()) {
1227 log.print(" succeeded]");
1228 }
1229 }
1230 return true; // for all recorded constraints added successfully.
1231 }
1232 }
1233 if (log.is_enabled()) {
1234 ResourceMark rm(current);
1235 log.print("[CDS has not recorded loader constraint for class %s]", klass->external_name());
1236 }
1237 return false;
1238 }
1239
1240 bool SystemDictionaryShared::is_supported_invokedynamic(BootstrapInfo* bsi) {
1241 LogTarget(Debug, cds, lambda) log;
1242 if (bsi->arg_values() == nullptr || !bsi->arg_values()->is_objArray()) {
1243 if (log.is_enabled()) {
1244 LogStream log_stream(log);
1245 log.print("bsi check failed");
1246 log.print(" bsi->arg_values().not_null() %d", bsi->arg_values().not_null());
1247 if (bsi->arg_values().not_null()) {
1248 log.print(" bsi->arg_values()->is_objArray() %d", bsi->arg_values()->is_objArray());
1249 bsi->print_msg_on(&log_stream);
1250 }
1251 }
1252 return false;
1253 }
1254
1255 Handle bsm = bsi->bsm();
1256 if (bsm.is_null() || !java_lang_invoke_DirectMethodHandle::is_instance(bsm())) {
1257 if (log.is_enabled()) {
1258 log.print("bsm check failed");
1259 log.print(" bsm.is_null() %d", bsm.is_null());
1260 log.print(" java_lang_invoke_DirectMethodHandle::is_instance(bsm()) %d",
1261 java_lang_invoke_DirectMethodHandle::is_instance(bsm()));
1262 }
1263 return false;
1264 }
1265
1266 oop mn = java_lang_invoke_DirectMethodHandle::member(bsm());
1267 Method* method = java_lang_invoke_MemberName::vmtarget(mn);
1268 if (method->klass_name()->equals("java/lang/invoke/LambdaMetafactory") &&
1269 method->name()->equals("metafactory") &&
1270 method->signature()->equals("(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;"
1271 "Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;"
1272 "Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;")) {
1273 return true;
1274 } else {
1275 if (log.is_enabled()) {
1276 ResourceMark rm;
1277 log.print("method check failed");
1278 log.print(" klass_name() %s", method->klass_name()->as_C_string());
1279 log.print(" name() %s", method->name()->as_C_string());
1280 log.print(" signature() %s", method->signature()->as_C_string());
1281 }
1282 }
1283
1284 return false;
1285 }
1286
1287 class EstimateSizeForArchive : StackObj {
1288 size_t _shared_class_info_size;
1289 int _num_builtin_klasses;
1290 int _num_unregistered_klasses;
1291
1292 public:
1293 EstimateSizeForArchive() {
1294 _shared_class_info_size = 0;
1295 _num_builtin_klasses = 0;
1296 _num_unregistered_klasses = 0;
1297 }
1298
1299 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
1300 if (!info.is_excluded()) {
1301 size_t byte_size = info.runtime_info_bytesize();
1302 _shared_class_info_size += align_up(byte_size, SharedSpaceObjectAlignment);
1303 }
1304 }
1305
1306 size_t total() {
1307 return _shared_class_info_size;
1308 }
1309 };
1310
1311 size_t SystemDictionaryShared::estimate_size_for_archive() {
1312 EstimateSizeForArchive est;
1313 _dumptime_table->iterate_all_live_classes(&est);
1314 size_t total_size = est.total() +
1315 CompactHashtableWriter::estimate_size(_dumptime_table->count_of(true)) +
1316 CompactHashtableWriter::estimate_size(_dumptime_table->count_of(false));
1317
1318 size_t bytesize = align_up(sizeof(RunTimeLambdaProxyClassInfo), SharedSpaceObjectAlignment);
1319 total_size +=
1320 (bytesize * _dumptime_lambda_proxy_class_dictionary->_count) +
1321 CompactHashtableWriter::estimate_size(_dumptime_lambda_proxy_class_dictionary->_count);
1322
1323 return total_size;
1324 }
1325
1326 unsigned int SystemDictionaryShared::hash_for_shared_dictionary(address ptr) {
1327 if (ArchiveBuilder::is_active()) {
1328 uintx offset = ArchiveBuilder::current()->any_to_offset(ptr);
1329 unsigned int hash = primitive_hash<uintx>(offset);
1330 DEBUG_ONLY({
1331 if (MetaspaceObj::is_shared((const MetaspaceObj*)ptr)) {
1332 assert(hash == SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr), "must be");
1333 }
1334 });
1335 return hash;
1336 } else {
1337 return SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr);
1338 }
1339 }
1340
1341 class CopyLambdaProxyClassInfoToArchive : StackObj {
1342 CompactHashtableWriter* _writer;
1343 ArchiveBuilder* _builder;
1344 public:
1345 CopyLambdaProxyClassInfoToArchive(CompactHashtableWriter* writer)
1346 : _writer(writer), _builder(ArchiveBuilder::current()) {}
1347 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
1348 // In static dump, info._proxy_klasses->at(0) is already relocated to point to the archived class
1349 // (not the original class).
1350 //
1351 // The following check has been moved to SystemDictionaryShared::find_all_archivable_classes(), which
1352 // happens before the classes are copied.
1353 //
1354 // if (SystemDictionaryShared::is_excluded_class(info._proxy_klasses->at(0))) {
1355 // return true;
1356 //}
1357 ResourceMark rm;
1358 log_info(cds,dynamic)("Archiving hidden %s", info._proxy_klasses->at(0)->external_name());
1359 size_t byte_size = sizeof(RunTimeLambdaProxyClassInfo);
1360 RunTimeLambdaProxyClassInfo* runtime_info =
1361 (RunTimeLambdaProxyClassInfo*)ArchiveBuilder::ro_region_alloc(byte_size);
1362 runtime_info->init(key, info);
1363 unsigned int hash = runtime_info->hash();
1364 u4 delta = _builder->any_to_offset_u4((void*)runtime_info);
1365 _writer->add(hash, delta);
1366 return true;
1367 }
1368 };
1369
1370 class AdjustLambdaProxyClassInfo : StackObj {
1371 public:
1372 AdjustLambdaProxyClassInfo() {}
1373 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
1374 int len = info._proxy_klasses->length();
1375 InstanceKlass* last_buff_k = nullptr;
1376
1377 for (int i = len - 1; i >= 0; i--) {
1378 InstanceKlass* orig_k = info._proxy_klasses->at(i);
1379 InstanceKlass* buff_k = ArchiveBuilder::current()->get_buffered_addr(orig_k);
1380 assert(ArchiveBuilder::current()->is_in_buffer_space(buff_k), "must be");
1381 buff_k->set_lambda_proxy_is_available();
1382 buff_k->set_next_link(last_buff_k);
1383 if (last_buff_k != nullptr) {
1384 ArchivePtrMarker::mark_pointer(buff_k->next_link_addr());
1385 }
1386 last_buff_k = buff_k;
1387 }
1388
1389 return true;
1390 }
1391 };
1392
1393 class CopySharedClassInfoToArchive : StackObj {
1394 CompactHashtableWriter* _writer;
1395 bool _is_builtin;
1396 ArchiveBuilder *_builder;
1397 public:
1398 CopySharedClassInfoToArchive(CompactHashtableWriter* writer,
1399 bool is_builtin)
1400 : _writer(writer), _is_builtin(is_builtin), _builder(ArchiveBuilder::current()) {}
1401
1402 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
1403 if (!info.is_excluded() && info.is_builtin() == _is_builtin) {
1404 size_t byte_size = info.runtime_info_bytesize();
1405 RunTimeClassInfo* record;
1406 record = (RunTimeClassInfo*)ArchiveBuilder::ro_region_alloc(byte_size);
1407 record->init(info);
1408
1409 unsigned int hash;
1410 Symbol* name = info._klass->name();
1411 name = ArchiveBuilder::current()->get_buffered_addr(name);
1412 hash = SystemDictionaryShared::hash_for_shared_dictionary((address)name);
1413 u4 delta = _builder->buffer_to_offset_u4((address)record);
1414 if (_is_builtin && info._klass->is_hidden()) {
1415 // skip
1416 } else {
1417 _writer->add(hash, delta);
1418 }
1419 if (log_is_enabled(Trace, cds, hashtables)) {
1420 ResourceMark rm;
1421 log_trace(cds,hashtables)("%s dictionary: %s", (_is_builtin ? "builtin" : "unregistered"), info._klass->external_name());
1422 }
1423
1424 // Save this for quick runtime lookup of InstanceKlass* -> RunTimeClassInfo*
1425 InstanceKlass* buffered_klass = ArchiveBuilder::current()->get_buffered_addr(info._klass);
1426 RunTimeClassInfo::set_for(buffered_klass, record);
1427 }
1428 }
1429 };
1430
1431 void SystemDictionaryShared::write_lambda_proxy_class_dictionary(LambdaProxyClassDictionary *dictionary) {
1432 CompactHashtableStats stats;
1433 dictionary->reset();
1434 CompactHashtableWriter writer(_dumptime_lambda_proxy_class_dictionary->_count, &stats);
1435 CopyLambdaProxyClassInfoToArchive copy(&writer);
1436 _dumptime_lambda_proxy_class_dictionary->iterate(©);
1437 writer.dump(dictionary, "lambda proxy class dictionary");
1438 }
1439
1440 void SystemDictionaryShared::write_dictionary(RunTimeSharedDictionary* dictionary,
1441 bool is_builtin) {
1442 CompactHashtableStats stats;
1443 dictionary->reset();
1444 CompactHashtableWriter writer(_dumptime_table->count_of(is_builtin), &stats);
1445 CopySharedClassInfoToArchive copy(&writer, is_builtin);
1446 assert_lock_strong(DumpTimeTable_lock);
1447 _dumptime_table->iterate_all_live_classes(©);
1448 writer.dump(dictionary, is_builtin ? "builtin dictionary" : "unregistered dictionary");
1449 }
1450
1451 void SystemDictionaryShared::write_to_archive(bool is_static_archive) {
1452 ArchiveInfo* archive = get_archive(is_static_archive);
1453
1454 write_dictionary(&archive->_builtin_dictionary, true);
1455 write_dictionary(&archive->_unregistered_dictionary, false);
1456
1457 write_lambda_proxy_class_dictionary(&archive->_lambda_proxy_class_dictionary);
1458 }
1459
1460 void SystemDictionaryShared::adjust_lambda_proxy_class_dictionary() {
1461 AdjustLambdaProxyClassInfo adjuster;
1462 _dumptime_lambda_proxy_class_dictionary->iterate(&adjuster);
1463 }
1464
1465 void SystemDictionaryShared::serialize_dictionary_headers(SerializeClosure* soc,
1466 bool is_static_archive) {
1467 ArchiveInfo* archive = get_archive(is_static_archive);
1468
1469 archive->_builtin_dictionary.serialize_header(soc);
1470 archive->_unregistered_dictionary.serialize_header(soc);
1471 archive->_lambda_proxy_class_dictionary.serialize_header(soc);
1472 }
1473
1474 void SystemDictionaryShared::serialize_vm_classes(SerializeClosure* soc) {
1475 for (auto id : EnumRange<vmClassID>{}) {
1476 soc->do_ptr(vmClasses::klass_addr_at(id));
1477 }
1478 }
1479
1480 const RunTimeClassInfo*
1481 SystemDictionaryShared::find_record(RunTimeSharedDictionary* static_dict, RunTimeSharedDictionary* dynamic_dict, Symbol* name) {
1482 if (!CDSConfig::is_using_archive() || !name->is_shared()) {
1483 // The names of all shared classes must also be a shared Symbol.
1484 return nullptr;
1485 }
1486
1487 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(name);
1488 const RunTimeClassInfo* record = nullptr;
1489 if (DynamicArchive::is_mapped()) {
1490 // Use the regenerated holder classes in the dynamic archive as they
1491 // have more methods than those in the base archive.
1492 if (name == vmSymbols::java_lang_invoke_Invokers_Holder() ||
1493 name == vmSymbols::java_lang_invoke_DirectMethodHandle_Holder() ||
1494 name == vmSymbols::java_lang_invoke_LambdaForm_Holder() ||
1495 name == vmSymbols::java_lang_invoke_DelegatingMethodHandle_Holder()) {
1496 record = dynamic_dict->lookup(name, hash, 0);
1497 if (record != nullptr) {
1498 return record;
1499 }
1500 }
1501 }
1502
1503 if (!MetaspaceShared::is_shared_dynamic(name)) {
1504 // The names of all shared classes in the static dict must also be in the
1505 // static archive
1506 record = static_dict->lookup(name, hash, 0);
1507 }
1508
1509 if (record == nullptr && DynamicArchive::is_mapped()) {
1510 record = dynamic_dict->lookup(name, hash, 0);
1511 }
1512
1513 return record;
1514 }
1515
1516 InstanceKlass* SystemDictionaryShared::find_builtin_class(Symbol* name) {
1517 const RunTimeClassInfo* record = find_record(&_static_archive._builtin_dictionary,
1518 &_dynamic_archive._builtin_dictionary,
1519 name);
1520 if (record != nullptr) {
1521 assert(!record->klass()->is_hidden(), "hidden class cannot be looked up by name");
1522 DEBUG_ONLY(check_klass_after_loading(record->klass());)
1523 // We did not save the classfile data of the generated LambdaForm invoker classes,
1524 // so we cannot support CLFH for such classes.
1525 if (record->klass()->is_generated_shared_class() && JvmtiExport::should_post_class_file_load_hook()) {
1526 return nullptr;
1527 }
1528 return record->klass();
1529 } else {
1530 return nullptr;
1531 }
1532 }
1533
1534 void SystemDictionaryShared::update_shared_entry(InstanceKlass* k, int id) {
1535 assert(CDSConfig::is_dumping_static_archive(), "class ID is used only for static dump (from classlist)");
1536 DumpTimeClassInfo* info = get_info(k);
1537 info->_id = id;
1538 }
1539
1540 static const char* class_loader_name_for_shared(Klass* k) {
1541 assert(k != nullptr, "Sanity");
1542 assert(k->is_shared(), "Must be");
1543 assert(k->is_instance_klass(), "Must be");
1544 InstanceKlass* ik = InstanceKlass::cast(k);
1545 if (ik->is_shared_boot_class()) {
1546 return "boot_loader";
1547 } else if (ik->is_shared_platform_class()) {
1548 return "platform_loader";
1549 } else if (ik->is_shared_app_class()) {
1550 return "app_loader";
1551 } else if (ik->is_shared_unregistered_class()) {
1552 return "unregistered_loader";
1553 } else {
1554 return "unknown loader";
1555 }
1556 }
1557
1558 class SharedDictionaryPrinter : StackObj {
1559 outputStream* _st;
1560 int _index;
1561 public:
1562 SharedDictionaryPrinter(outputStream* st) : _st(st), _index(0) {}
1563
1564 void do_value(const RunTimeClassInfo* record) {
1565 ResourceMark rm;
1566 _st->print_cr("%4d: %s %s", _index++, record->klass()->external_name(),
1567 class_loader_name_for_shared(record->klass()));
1568 if (record->klass()->array_klasses() != nullptr) {
1569 record->klass()->array_klasses()->cds_print_value_on(_st);
1570 _st->cr();
1571 }
1572 }
1573 int index() const { return _index; }
1574 };
1575
1576 class SharedLambdaDictionaryPrinter : StackObj {
1577 outputStream* _st;
1578 int _index;
1579 public:
1580 SharedLambdaDictionaryPrinter(outputStream* st, int idx) : _st(st), _index(idx) {}
1581
1582 void do_value(const RunTimeLambdaProxyClassInfo* record) {
1583 if (record->proxy_klass_head()->lambda_proxy_is_available()) {
1584 ResourceMark rm;
1585 Klass* k = record->proxy_klass_head();
1586 while (k != nullptr) {
1587 _st->print_cr("%4d: %s %s", _index++, k->external_name(),
1588 class_loader_name_for_shared(k));
1589 k = k->next_link();
1590 }
1591 }
1592 }
1593 };
1594
1595 void SystemDictionaryShared::ArchiveInfo::print_on(const char* prefix,
1596 outputStream* st) {
1597 st->print_cr("%sShared Dictionary", prefix);
1598 SharedDictionaryPrinter p(st);
1599 st->print_cr("%sShared Builtin Dictionary", prefix);
1600 _builtin_dictionary.iterate(&p);
1601 st->print_cr("%sShared Unregistered Dictionary", prefix);
1602 _unregistered_dictionary.iterate(&p);
1603 if (!_lambda_proxy_class_dictionary.empty()) {
1604 st->print_cr("%sShared Lambda Dictionary", prefix);
1605 SharedLambdaDictionaryPrinter ldp(st, p.index());
1606 _lambda_proxy_class_dictionary.iterate(&ldp);
1607 }
1608 }
1609
1610 void SystemDictionaryShared::ArchiveInfo::print_table_statistics(const char* prefix,
1611 outputStream* st) {
1612 st->print_cr("%sArchve Statistics", prefix);
1613 _builtin_dictionary.print_table_statistics(st, "Builtin Shared Dictionary");
1614 _unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary");
1615 _lambda_proxy_class_dictionary.print_table_statistics(st, "Lambda Shared Dictionary");
1616 }
1617
1618 void SystemDictionaryShared::print_shared_archive(outputStream* st, bool is_static) {
1619 if (CDSConfig::is_using_archive()) {
1620 if (is_static) {
1621 _static_archive.print_on("", st);
1622 } else {
1623 if (DynamicArchive::is_mapped()) {
1624 _dynamic_archive.print_on("Dynamic ", st);
1625 }
1626 }
1627 }
1628 }
1629
1630 void SystemDictionaryShared::print_on(outputStream* st) {
1631 print_shared_archive(st, true);
1632 print_shared_archive(st, false);
1633 }
1634
1635 void SystemDictionaryShared::print_table_statistics(outputStream* st) {
1636 if (CDSConfig::is_using_archive()) {
1637 _static_archive.print_table_statistics("Static ", st);
1638 if (DynamicArchive::is_mapped()) {
1639 _dynamic_archive.print_table_statistics("Dynamic ", st);
1640 }
1641 }
1642 }
1643
1644 bool SystemDictionaryShared::is_dumptime_table_empty() {
1645 assert_lock_strong(DumpTimeTable_lock);
1646 _dumptime_table->update_counts();
1647 if (_dumptime_table->count_of(true) == 0 && _dumptime_table->count_of(false) == 0){
1648 return true;
1649 }
1650 return false;
1651 }
1652
1653 class CleanupDumpTimeLambdaProxyClassTable: StackObj {
1654 public:
1655 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
1656 assert_lock_strong(DumpTimeTable_lock);
1657 InstanceKlass* caller_ik = key.caller_ik();
1658 InstanceKlass* nest_host = caller_ik->nest_host_not_null();
1659
1660 // If the caller class and/or nest_host are excluded, the associated lambda proxy
1661 // must also be excluded.
1662 bool always_exclude = SystemDictionaryShared::check_for_exclusion(caller_ik, nullptr) ||
1663 SystemDictionaryShared::check_for_exclusion(nest_host, nullptr);
1664
1665 for (int i = info._proxy_klasses->length() - 1; i >= 0; i--) {
1666 InstanceKlass* ik = info._proxy_klasses->at(i);
1667 if (always_exclude || SystemDictionaryShared::check_for_exclusion(ik, nullptr)) {
1668 SystemDictionaryShared::reset_registered_lambda_proxy_class(ik);
1669 info._proxy_klasses->remove_at(i);
1670 }
1671 }
1672 return info._proxy_klasses->length() == 0 ? true /* delete the node*/ : false;
1673 }
1674 };
1675
1676 void SystemDictionaryShared::cleanup_lambda_proxy_class_dictionary() {
1677 assert_lock_strong(DumpTimeTable_lock);
1678 CleanupDumpTimeLambdaProxyClassTable cleanup_proxy_classes;
1679 _dumptime_lambda_proxy_class_dictionary->unlink(&cleanup_proxy_classes);
1680 }