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/lambdaFormInvokers.inline.hpp"
38 #include "cds/metaspaceShared.hpp"
39 #include "cds/runTimeClassInfo.hpp"
40 #include "classfile/classFileStream.hpp"
41 #include "classfile/classLoader.hpp"
42 #include "classfile/classLoaderData.inline.hpp"
43 #include "classfile/classLoaderDataGraph.hpp"
44 #include "classfile/classLoaderExt.hpp"
45 #include "classfile/dictionary.hpp"
46 #include "classfile/javaClasses.hpp"
47 #include "classfile/javaClasses.inline.hpp"
48 #include "classfile/symbolTable.hpp"
49 #include "classfile/systemDictionary.hpp"
50 #include "classfile/systemDictionaryShared.hpp"
51 #include "classfile/verificationType.hpp"
52 #include "classfile/vmClasses.hpp"
53 #include "classfile/vmSymbols.hpp"
54 #include "interpreter/bootstrapInfo.hpp"
55 #include "jfr/jfrEvents.hpp"
56 #include "logging/log.hpp"
57 #include "logging/logStream.hpp"
58 #include "memory/allocation.hpp"
59 #include "memory/metadataFactory.hpp"
60 #include "memory/metaspaceClosure.hpp"
61 #include "memory/oopFactory.hpp"
62 #include "memory/resourceArea.hpp"
63 #include "memory/universe.hpp"
64 #include "oops/compressedKlass.inline.hpp"
65 #include "oops/instanceKlass.hpp"
66 #include "oops/klass.inline.hpp"
67 #include "oops/methodData.hpp"
68 #include "oops/trainingData.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 //assert(!k->is_shared(), "sanity"); // FIXME new workflow
205 return get_info_locked(k);
206 }
207
208 DumpTimeClassInfo* SystemDictionaryShared::get_info_locked(InstanceKlass* k) {
209 assert_lock_strong(DumpTimeTable_lock);
210 //assert(!k->is_shared(), "sanity"); // FIXME new workflow
211 DumpTimeClassInfo* info = _dumptime_table->get_info(k);
212 assert(info != nullptr, "must be");
213 return info;
214 }
215
216 void SystemDictionaryShared::mark_required_hidden_class(InstanceKlass* k) {
217 assert(k->is_hidden(), "sanity");
218 DumpTimeClassInfo* info = _dumptime_table->get(k);
219 ResourceMark rm;
220 if (info != nullptr) {
221 info->set_is_required_hidden_class();
222 }
223 }
224
225 bool SystemDictionaryShared::check_for_exclusion(InstanceKlass* k, DumpTimeClassInfo* info) {
226 if (!CDSConfig::is_dumping_final_static_archive() && MetaspaceShared::is_in_shared_metaspace(k)) {
227 // We have reached a super type that's already in the base archive. Treat it
228 // as "not excluded".
229 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
230 return false;
231 }
232
233 if (info == nullptr) {
234 info = _dumptime_table->get(k);
235 assert(info != nullptr, "supertypes of any classes in _dumptime_table must either be shared, or must also be in _dumptime_table");
236 }
237
238 if (!info->has_checked_exclusion()) {
239 if (check_for_exclusion_impl(k)) {
240 info->set_excluded();
241 }
242 info->set_has_checked_exclusion();
243 }
244
245 return info->is_excluded();
246 }
247
248 // Returns true so the caller can do: return warn_excluded(".....");
249 bool SystemDictionaryShared::warn_excluded(InstanceKlass* k, const char* reason) {
250 ResourceMark rm;
251 log_warning(cds)("Skipping %s: %s", k->name()->as_C_string(), reason);
252 return true;
253 }
254
255 bool SystemDictionaryShared::is_jfr_event_class(InstanceKlass *k) {
256 while (k) {
257 if (k->name()->equals("jdk/internal/event/Event")) {
258 return true;
259 }
260 k = k->java_super();
261 }
262 return false;
263 }
264
265 bool SystemDictionaryShared::is_registered_lambda_proxy_class(InstanceKlass* ik) {
266 DumpTimeClassInfo* info = _dumptime_table->get(ik);
267 return (info != nullptr) ? info->_is_archived_lambda_proxy : false;
268 }
269
270 void SystemDictionaryShared::reset_registered_lambda_proxy_class(InstanceKlass* ik) {
271 DumpTimeClassInfo* info = _dumptime_table->get(ik);
272 if (info != nullptr) {
273 info->_is_archived_lambda_proxy = false;
274 info->set_excluded();
275 }
276 }
277
278 bool SystemDictionaryShared::is_early_klass(InstanceKlass* ik) {
279 DumpTimeClassInfo* info = _dumptime_table->get(ik);
280 return (info != nullptr) ? info->is_early_klass() : false;
281 }
282
283 bool SystemDictionaryShared::is_hidden_lambda_proxy(InstanceKlass* ik) {
284 assert(ik->is_shared(), "applicable to only a shared class");
285 if (ik->is_hidden()) {
286 return true;
287 } else {
288 return false;
289 }
290 }
291
292 void SystemDictionaryShared::ignore_new_classes() {
293 _ignore_new_classes = true;
294 }
295
296
297 bool SystemDictionaryShared::check_for_exclusion_impl(InstanceKlass* k) {
298 if (CDSConfig::is_dumping_final_static_archive() && k->is_shared_unregistered_class()
299 && k->is_shared()) {
300 return false; // Do not exclude: unregistered classes are passed from preimage to final image.
301 }
302
303 if (k->is_in_error_state()) {
304 return warn_excluded(k, "In error state");
305 }
306 if (k->is_scratch_class()) {
307 return warn_excluded(k, "A scratch class");
308 }
309 if (!k->is_loaded()) {
310 return warn_excluded(k, "Not in loaded state");
311 }
312 if (has_been_redefined(k)) {
313 return warn_excluded(k, "Has been redefined");
314 }
315 if (!k->is_hidden() && k->shared_classpath_index() < 0 && is_builtin(k)) {
316 if (k->name()->starts_with("java/lang/invoke/BoundMethodHandle$Species_")) {
317 // This class is dynamically generated by the JDK
318 if (CDSConfig::is_dumping_aot_linked_classes()) {
319 k->set_shared_classpath_index(0);
320 } else {
321 ResourceMark rm;
322 log_info(cds)("Skipping %s because it is dynamically generated", k->name()->as_C_string());
323 return true; // exclude without warning
324 }
325 } else {
326 // These are classes loaded from unsupported locations (such as those loaded by JVMTI native
327 // agent during dump time).
328 return warn_excluded(k, "Unsupported location");
329 }
330 }
331 if (k->signers() != nullptr) {
332 // We cannot include signed classes in the archive because the certificates
333 // used during dump time may be different than those used during
334 // runtime (due to expiration, etc).
335 return warn_excluded(k, "Signed JAR");
336 }
337 if (is_jfr_event_class(k)) {
338 // We cannot include JFR event classes because they need runtime-specific
339 // instrumentation in order to work with -XX:FlightRecorderOptions:retransform=false.
340 // There are only a small number of these classes, so it's not worthwhile to
341 // support them and make CDS more complicated.
342 if (!CDSConfig::is_dumping_reflection_data()) { // FIXME: !!! HACK !!!
343 return warn_excluded(k, "JFR event class");
344 }
345 }
346
347 if (!CDSConfig::preserve_all_dumptime_verification_states(k)) {
348 if (!k->is_linked()) {
349 if (has_class_failed_verification(k)) {
350 return warn_excluded(k, "Failed verification");
351 }
352 } else {
353 if (!k->can_be_verified_at_dumptime()) {
354 // We have an old class that has been linked (e.g., it's been executed during
355 // dump time). This class has been verified using the old verifier, which
356 // doesn't save the verification constraints, so check_verification_constraints()
357 // won't work at runtime.
358 // As a result, we cannot store this class. It must be loaded and fully verified
359 // at runtime.
360 return warn_excluded(k, "Old class has been linked");
361 }
362 }
363 }
364
365 if (k->is_hidden() && !should_hidden_class_be_archived(k)) {
366 log_info(cds)("Skipping %s: Hidden class", k->name()->as_C_string());
367 return true;
368 }
369
370 InstanceKlass* super = k->java_super();
371 if (super != nullptr && check_for_exclusion(super, nullptr)) {
372 ResourceMark rm;
373 log_warning(cds)("Skipping %s: super class %s is excluded", k->name()->as_C_string(), super->name()->as_C_string());
374 return true;
375 }
376
377 Array<InstanceKlass*>* interfaces = k->local_interfaces();
378 int len = interfaces->length();
379 for (int i = 0; i < len; i++) {
380 InstanceKlass* intf = interfaces->at(i);
381 if (check_for_exclusion(intf, nullptr)) {
382 ResourceMark rm;
383 log_warning(cds)("Skipping %s: interface %s is excluded", k->name()->as_C_string(), intf->name()->as_C_string());
384 return true;
385 }
386 }
387
388 if (ClassLoaderExt::should_be_excluded(k)) {
389 ResourceMark rm;
390 log_info(cds)("Skipping %s: excluded via -XX:CacheOnlyClassesIn", k->name()->as_C_string());
391 return true;
392 }
393
394 return false; // false == k should NOT be excluded
395 }
396
397 bool SystemDictionaryShared::is_builtin_loader(ClassLoaderData* loader_data) {
398 oop class_loader = loader_data->class_loader();
399 return (class_loader == nullptr ||
400 SystemDictionary::is_system_class_loader(class_loader) ||
401 SystemDictionary::is_platform_class_loader(class_loader));
402 }
403
404 bool SystemDictionaryShared::has_platform_or_app_classes() {
405 if (FileMapInfo::current_info()->has_platform_or_app_classes()) {
406 return true;
407 }
408 if (DynamicArchive::is_mapped() &&
409 FileMapInfo::dynamic_info()->has_platform_or_app_classes()) {
410 return true;
411 }
412 return false;
413 }
414
415 // The following stack shows how this code is reached:
416 //
417 // [0] SystemDictionaryShared::find_or_load_shared_class()
418 // [1] JVM_FindLoadedClass
419 // [2] java.lang.ClassLoader.findLoadedClass0()
420 // [3] java.lang.ClassLoader.findLoadedClass()
421 // [4] jdk.internal.loader.BuiltinClassLoader.loadClassOrNull()
422 // [5] jdk.internal.loader.BuiltinClassLoader.loadClass()
423 // [6] jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(), or
424 // jdk.internal.loader.ClassLoaders$PlatformClassLoader.loadClass()
425 //
426 // AppCDS supports fast class loading for these 2 built-in class loaders:
427 // jdk.internal.loader.ClassLoaders$PlatformClassLoader
428 // jdk.internal.loader.ClassLoaders$AppClassLoader
429 // with the following assumptions (based on the JDK core library source code):
430 //
431 // [a] these two loaders use the BuiltinClassLoader.loadClassOrNull() to
432 // load the named class.
433 // [b] BuiltinClassLoader.loadClassOrNull() first calls findLoadedClass(name).
434 // [c] At this point, if we can find the named class inside the
435 // shared_dictionary, we can perform further checks (see
436 // SystemDictionary::is_shared_class_visible) to ensure that this class
437 // was loaded by the same class loader during dump time.
438 //
439 // Given these assumptions, we intercept the findLoadedClass() call to invoke
440 // SystemDictionaryShared::find_or_load_shared_class() to load the shared class from
441 // the archive for the 2 built-in class loaders. This way,
442 // we can improve start-up because we avoid decoding the classfile,
443 // and avoid delegating to the parent loader.
444 //
445 // NOTE: there's a lot of assumption about the Java code. If any of that change, this
446 // needs to be redesigned.
447
448 InstanceKlass* SystemDictionaryShared::find_or_load_shared_class(
449 Symbol* name, Handle class_loader, TRAPS) {
450 InstanceKlass* k = nullptr;
451 if (CDSConfig::is_using_archive()) {
452 if (!has_platform_or_app_classes()) {
453 return nullptr;
454 }
455
456 if (SystemDictionary::is_system_class_loader(class_loader()) ||
457 SystemDictionary::is_platform_class_loader(class_loader())) {
458 ClassLoaderData *loader_data = register_loader(class_loader);
459 Dictionary* dictionary = loader_data->dictionary();
460
461 // Note: currently, find_or_load_shared_class is called only from
462 // JVM_FindLoadedClass and used for PlatformClassLoader and AppClassLoader,
463 // which are parallel-capable loaders, so a lock here is NOT taken.
464 assert(get_loader_lock_or_null(class_loader) == nullptr, "ObjectLocker not required");
465 {
466 MutexLocker mu(THREAD, SystemDictionary_lock);
467 InstanceKlass* check = dictionary->find_class(THREAD, name);
468 if (check != nullptr) {
469 return check;
470 }
471 }
472
473 k = load_shared_class_for_builtin_loader(name, class_loader, THREAD);
474 if (k != nullptr) {
475 SharedClassLoadingMark slm(THREAD, k);
476 k = find_or_define_instance_class(name, class_loader, k, CHECK_NULL);
477 }
478 }
479 }
480
481 DEBUG_ONLY(check_klass_after_loading(k);)
482
483 return k;
484 }
485
486 class UnregisteredClassesTable : public ResourceHashtable<
487 Symbol*, InstanceKlass*,
488 15889, // prime number
489 AnyObj::C_HEAP> {};
490
491 static UnregisteredClassesTable* _unregistered_classes_table = nullptr;
492
493 // true == class was successfully added; false == a duplicated class (with the same name) already exists.
494 bool SystemDictionaryShared::add_unregistered_class(Thread* current, InstanceKlass* klass) {
495 // We don't allow duplicated unregistered classes with the same name.
496 // We only archive the first class with that name that succeeds putting
497 // itself into the table.
498 assert(CDSConfig::is_dumping_archive() || ClassListWriter::is_enabled(), "sanity");
499 MutexLocker ml(current, UnregisteredClassesTable_lock, Mutex::_no_safepoint_check_flag);
500 Symbol* name = klass->name();
501 if (_unregistered_classes_table == nullptr) {
502 _unregistered_classes_table = new (mtClass)UnregisteredClassesTable();
503 }
504 bool created;
505 InstanceKlass** v = _unregistered_classes_table->put_if_absent(name, klass, &created);
506 if (created) {
507 name->increment_refcount();
508 }
509 return (klass == *v);
510 }
511
512 // This function is called to lookup the super/interfaces of shared classes for
513 // unregistered loaders. E.g., SharedClass in the below example
514 // where "super:" (and optionally "interface:") have been specified.
515 //
516 // java/lang/Object id: 0
517 // Interface id: 2 super: 0 source: cust.jar
518 // SharedClass id: 4 super: 0 interfaces: 2 source: cust.jar
519 InstanceKlass* SystemDictionaryShared::lookup_super_for_unregistered_class(
520 Symbol* class_name, Symbol* super_name, bool is_superclass) {
521
522 assert(CDSConfig::is_dumping_static_archive(), "only when static dumping");
523
524 if (!ClassListParser::is_parsing_thread()) {
525 // Unregistered classes can be created only by ClassListParser::_parsing_thread.
526
527 return nullptr;
528 }
529
530 ClassListParser* parser = ClassListParser::instance();
531 if (parser == nullptr) {
532 // We're still loading the well-known classes, before the ClassListParser is created.
533 return nullptr;
534 }
535 if (class_name->equals(parser->current_class_name())) {
536 // When this function is called, all the numbered super and interface types
537 // must have already been loaded. Hence this function is never recursively called.
538 if (is_superclass) {
539 return parser->lookup_super_for_current_class(super_name);
540 } else {
541 return parser->lookup_interface_for_current_class(super_name);
542 }
543 } else {
544 // The VM is not trying to resolve a super type of parser->current_class_name().
545 // Instead, it's resolving an error class (because parser->current_class_name() has
546 // failed parsing or verification). Don't do anything here.
547 return nullptr;
548 }
549 }
550
551 void SystemDictionaryShared::set_shared_class_misc_info(InstanceKlass* k, ClassFileStream* cfs) {
552 assert(CDSConfig::is_dumping_archive(), "sanity");
553 assert(!is_builtin(k), "must be unregistered class");
554 DumpTimeClassInfo* info = get_info(k);
555 info->_clsfile_size = cfs->length();
556 info->_clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
557 }
558
559 void SystemDictionaryShared::initialize() {
560 if (CDSConfig::is_dumping_archive()) {
561 _dumptime_table = new (mtClass) DumpTimeSharedClassTable;
562 _dumptime_lambda_proxy_class_dictionary =
563 new (mtClass) DumpTimeLambdaProxyClassDictionary;
564 }
565 }
566
567 void SystemDictionaryShared::init_dumptime_info(InstanceKlass* k) {
568 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
569 assert(SystemDictionaryShared::class_loading_may_happen(), "sanity");
570 DumpTimeClassInfo* info = _dumptime_table->allocate_info(k);
571 if (_ignore_new_classes) {
572 if (!LambdaFormInvokers::may_be_regenerated_class(k->name())) {
573 ResourceMark rm;
574 log_debug(cds)("Skipping %s: Class loaded for lambda form invoker regeneration", k->name()->as_C_string());
575 info->set_excluded();
576 }
577 }
578 }
579
580 void SystemDictionaryShared::remove_dumptime_info(InstanceKlass* k) {
581 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
582 _dumptime_table->remove(k);
583 }
584
585 void SystemDictionaryShared::handle_class_unloading(InstanceKlass* klass) {
586 if (CDSConfig::is_dumping_archive()) {
587 remove_dumptime_info(klass);
588 }
589
590 if (CDSConfig::is_dumping_archive() || ClassListWriter::is_enabled()) {
591 MutexLocker ml(Thread::current(), UnregisteredClassesTable_lock, Mutex::_no_safepoint_check_flag);
592 if (_unregistered_classes_table != nullptr) {
593 // Remove the class from _unregistered_classes_table: keep the entry but
594 // set it to null. This ensure no classes with the same name can be
595 // added again.
596 InstanceKlass** v = _unregistered_classes_table->get(klass->name());
597 if (v != nullptr) {
598 *v = nullptr;
599 }
600 }
601 } else {
602 assert(_unregistered_classes_table == nullptr, "must not be used");
603 }
604
605 if (ClassListWriter::is_enabled()) {
606 ClassListWriter cw;
607 cw.handle_class_unloading((const InstanceKlass*)klass);
608 }
609 }
610
611 // Check if a class or any of its supertypes has been redefined.
612 bool SystemDictionaryShared::has_been_redefined(InstanceKlass* k) {
613 if (k->has_been_redefined()) {
614 return true;
615 }
616 if (k->java_super() != nullptr && has_been_redefined(k->java_super())) {
617 return true;
618 }
619 Array<InstanceKlass*>* interfaces = k->local_interfaces();
620 int len = interfaces->length();
621 for (int i = 0; i < len; i++) {
622 if (has_been_redefined(interfaces->at(i))) {
623 return true;
624 }
625 }
626 return false;
627 }
628
629 // k is a class before relocating by ArchiveBuilder
630 void SystemDictionaryShared::validate_before_archiving(InstanceKlass* k) {
631 ResourceMark rm;
632 const char* name = k->name()->as_C_string();
633 DumpTimeClassInfo* info = _dumptime_table->get(k);
634 assert(!class_loading_may_happen(), "class loading must be disabled");
635 guarantee(info != nullptr, "Class %s must be entered into _dumptime_table", name);
636 guarantee(!info->is_excluded(), "Should not attempt to archive excluded class %s", name);
637 if (is_builtin(k)) {
638 if (k->is_hidden()) {
639 if (CDSConfig::is_dumping_invokedynamic()) {
640 assert(should_hidden_class_be_archived(k), "unexpected hidden class %s", name);
641 } else {
642 assert(is_registered_lambda_proxy_class(k), "unexpected hidden class %s", name);
643 }
644 }
645 guarantee(!k->is_shared_unregistered_class(),
646 "Class loader type must be set for BUILTIN class %s", name);
647
648 } else {
649 guarantee(k->is_shared_unregistered_class(),
650 "Class loader type must not be set for UNREGISTERED class %s", name);
651 }
652 }
653
654 class UnregisteredClassesDuplicationChecker : StackObj {
655 GrowableArray<InstanceKlass*> _list;
656 Thread* _thread;
657 public:
658 UnregisteredClassesDuplicationChecker() : _thread(Thread::current()) {}
659
660 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
661 if (!SystemDictionaryShared::is_builtin(k)) {
662 _list.append(k);
663 }
664 }
665
666 static int compare_by_loader(InstanceKlass** a, InstanceKlass** b) {
667 ClassLoaderData* loader_a = a[0]->class_loader_data();
668 ClassLoaderData* loader_b = b[0]->class_loader_data();
669
670 if (loader_a != loader_b) {
671 return primitive_compare(loader_a, loader_b);
672 } else {
673 return primitive_compare(a[0], b[0]);
674 }
675 }
676
677 void mark_duplicated_classes() {
678 // Two loaders may load two identical or similar hierarchies of classes. If we
679 // check for duplication in random order, we may end up excluding important base classes
680 // in both hierarchies, causing most of the classes to be excluded.
681 // We sort the classes by their loaders. This way we're likely to archive
682 // all classes in the one of the two hierarchies.
683 _list.sort(compare_by_loader);
684 for (int i = 0; i < _list.length(); i++) {
685 InstanceKlass* k = _list.at(i);
686 bool i_am_first = SystemDictionaryShared::add_unregistered_class(_thread, k);
687 if (!i_am_first) {
688 SystemDictionaryShared::warn_excluded(k, "Duplicated unregistered class");
689 SystemDictionaryShared::set_excluded_locked(k);
690 }
691 }
692 }
693 };
694
695 void SystemDictionaryShared::scan_constant_pool(InstanceKlass* k) {
696 if (CDSConfig::is_dumping_invokedynamic()) {
697 k->constants()->find_required_hidden_classes();
698 }
699 }
700
701 bool SystemDictionaryShared::should_hidden_class_be_archived(InstanceKlass* k) {
702 assert(k->is_hidden(), "sanity");
703 if (is_registered_lambda_proxy_class(k)) {
704 return true;
705 }
706
707 if (CDSConfig::is_dumping_invokedynamic()) {
708 DumpTimeClassInfo* info = _dumptime_table->get(k);
709 if (info != nullptr && info->is_required_hidden_class()) {
710 guarantee(HeapShared::is_archivable_hidden_klass(k), "required hidden class must be archivable");
711 return true;
712 }
713 }
714
715 return false;
716 }
717
718 // Returns true if the class should be excluded. This can be called by
719 // AOTConstantPoolResolver before or after we enter the CDS safepoint.
720 // When called before the safepoint, we need to link the class so that
721 // it can be checked by check_for_exclusion().
722 bool SystemDictionaryShared::should_be_excluded(Klass* k) {
723 assert(CDSConfig::is_dumping_archive(), "sanity");
724 assert(CDSConfig::current_thread_is_vm_or_dumper(), "sanity");
725
726 if (k->is_objArray_klass()) {
727 return should_be_excluded(ObjArrayKlass::cast(k)->bottom_klass());
728 }
729
730 if (!k->is_instance_klass()) {
731 return false;
732 } else {
733 InstanceKlass* ik = InstanceKlass::cast(k);
734
735 if (!SafepointSynchronize::is_at_safepoint()) {
736 if (!ik->is_linked()) {
737 // check_for_exclusion() below doesn't link unlinked classes. We come
738 // here only when we are trying to aot-link constant pool entries, so
739 // we'd better link the class.
740 JavaThread* THREAD = JavaThread::current();
741 ik->link_class(THREAD);
742 if (HAS_PENDING_EXCEPTION) {
743 CLEAR_PENDING_EXCEPTION;
744 return true; // linking failed -- let's exclude it
745 }
746 }
747
748 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
749 DumpTimeClassInfo* p = get_info_locked(ik);
750 if (p->is_excluded()) {
751 return true;
752 }
753 return check_for_exclusion(ik, p);
754 } else {
755 // No need to check for is_linked() as all eligible classes should have
756 // already been linked in MetaspaceShared::link_class_for_cds().
757 // Can't take the lock as we are in safepoint.
758 DumpTimeClassInfo* p = _dumptime_table->get(ik);
759 if (p->is_excluded()) {
760 return true;
761 }
762 return check_for_exclusion(ik, p);
763 }
764 }
765 }
766
767 void SystemDictionaryShared::find_all_archivable_classes() {
768 HeapShared::start_finding_required_hidden_classes();
769 find_all_archivable_classes_impl();
770 HeapShared::end_finding_required_hidden_classes();
771 }
772
773 // Iterate over all the classes in _dumptime_table, marking the ones that must be
774 // excluded from the archive. Those that are not excluded will be archivable.
775 //
776 // (a) Non-hidden classes are easy. They are only check by the rules in
777 // SystemDictionaryShared::check_for_exclusion().
778 // (b) For hidden classes, we only archive those that are required (i.e., they are
779 // referenced by Java objects (such as CallSites) that are reachable from
780 // ConstantPools). This needs help from HeapShared.
781 void SystemDictionaryShared::find_all_archivable_classes_impl() {
782 assert(!class_loading_may_happen(), "class loading must be disabled");
783 assert_lock_strong(DumpTimeTable_lock);
784
785 if (CDSConfig::is_dumping_dynamic_archive()) {
786 // Do this first -- if a base class is excluded due to duplication,
787 // all of its subclasses will also be excluded.
788 ResourceMark rm;
789 UnregisteredClassesDuplicationChecker dup_checker;
790 _dumptime_table->iterate_all_live_classes(&dup_checker);
791 dup_checker.mark_duplicated_classes();
792 }
793
794 ResourceMark rm;
795
796 // First, scan all non-hidden classes
797 auto check_non_hidden = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
798 if (!k->is_hidden()) {
799 SystemDictionaryShared::check_for_exclusion(k, &info);
800 if (!info.is_excluded() && !info.has_scanned_constant_pool()) {
801 scan_constant_pool(k);
802 info.set_has_scanned_constant_pool();
803 }
804 }
805 };
806 _dumptime_table->iterate_all_live_classes(check_non_hidden);
807
808 // Then, scan all the hidden classes that have been marked as required to
809 // discover more hidden classes. Stop when we cannot make progress anymore.
810 bool made_progress;
811 do {
812 made_progress = false;
813 auto check_hidden = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
814 if (k->is_hidden() && should_hidden_class_be_archived(k)) {
815 SystemDictionaryShared::check_for_exclusion(k, &info);
816 if (info.is_excluded()) {
817 guarantee(!info.is_required_hidden_class(), "A required hidden class cannot be marked as excluded");
818 } else if (!info.has_scanned_constant_pool()) {
819 scan_constant_pool(k);
820 info.set_has_scanned_constant_pool();
821 // The CP entries in k *MAY* refer to other hidden classes, so scan
822 // every hidden class again.
823 made_progress = true;
824 }
825 }
826 };
827 _dumptime_table->iterate_all_live_classes(check_hidden);
828 } while (made_progress);
829
830 // Now, all hidden classes that have not yet been scanned must be marked as excluded
831 auto exclude_remaining_hidden = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
832 if (k->is_hidden()) {
833 SystemDictionaryShared::check_for_exclusion(k, &info);
834 if (CDSConfig::is_dumping_invokedynamic()) {
835 if (should_hidden_class_be_archived(k)) {
836 guarantee(!info.is_excluded(), "Must be");
837 } else {
838 guarantee(info.is_excluded(), "Must be");
839 }
840 }
841 }
842 };
843 _dumptime_table->iterate_all_live_classes(exclude_remaining_hidden);
844 _dumptime_table->update_counts();
845
846 cleanup_lambda_proxy_class_dictionary();
847
848 TrainingData::cleanup_training_data();
849 }
850
851 bool SystemDictionaryShared::is_excluded_class(InstanceKlass* k) {
852 assert(!class_loading_may_happen(), "class loading must be disabled");
853 assert_lock_strong(DumpTimeTable_lock);
854 assert(CDSConfig::is_dumping_archive(), "sanity");
855 DumpTimeClassInfo* p = get_info_locked(k);
856 return p->is_excluded();
857 }
858
859 void SystemDictionaryShared::set_excluded_locked(InstanceKlass* k) {
860 assert_lock_strong(DumpTimeTable_lock);
861 assert(CDSConfig::is_dumping_archive(), "sanity");
862 DumpTimeClassInfo* info = get_info_locked(k);
863 info->set_excluded();
864 }
865
866 void SystemDictionaryShared::set_excluded(InstanceKlass* k) {
867 assert(CDSConfig::is_dumping_archive(), "sanity");
868 DumpTimeClassInfo* info = get_info(k);
869 info->set_excluded();
870 }
871
872 void SystemDictionaryShared::set_class_has_failed_verification(InstanceKlass* ik) {
873 assert(CDSConfig::is_dumping_archive(), "sanity");
874 DumpTimeClassInfo* p = get_info(ik);
875 p->set_failed_verification();
876 }
877
878 bool SystemDictionaryShared::has_class_failed_verification(InstanceKlass* ik) {
879 assert(CDSConfig::is_dumping_archive(), "sanity");
880 DumpTimeClassInfo* p = _dumptime_table->get(ik);
881 return (p == nullptr) ? false : p->failed_verification();
882 }
883
884 void SystemDictionaryShared::dumptime_classes_do(class MetaspaceClosure* it) {
885 assert_lock_strong(DumpTimeTable_lock);
886
887 auto do_klass = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
888 if (CDSConfig::is_dumping_final_static_archive() && !k->is_loaded()) {
889 assert(k->is_shared_unregistered_class(), "must be");
890 info.metaspace_pointers_do(it);
891 } else if (k->is_loader_alive() && !info.is_excluded()) {
892 info.metaspace_pointers_do(it);
893 }
894 };
895 _dumptime_table->iterate_all_live_classes(do_klass);
896
897 auto do_lambda = [&] (LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
898 if (key.caller_ik()->is_loader_alive()) {
899 info.metaspace_pointers_do(it);
900 key.metaspace_pointers_do(it);
901 }
902 };
903 _dumptime_lambda_proxy_class_dictionary->iterate_all(do_lambda);
904 }
905
906 bool SystemDictionaryShared::add_verification_constraint(InstanceKlass* k, Symbol* name,
907 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) {
908 assert(CDSConfig::is_dumping_archive(), "sanity");
909 if (CDSConfig::is_dumping_dynamic_archive() && k->is_shared()) {
910 // k is a new class in the static archive, but one of its supertypes is an old class, so k wasn't
911 // verified during dump time. No need to record constraints as k won't be included in the dynamic archive.
912 return false;
913 }
914 if (CDSConfig::is_dumping_aot_linked_classes() && is_builtin(k)) {
915 // There's no need to save verification constraints
916 // TODO -- double check the logic before integrating into mainline!!
917 return false;
918 }
919
920 DumpTimeClassInfo* info = get_info(k);
921 info->add_verification_constraint(k, name, from_name, from_field_is_protected,
922 from_is_array, from_is_object);
923
924 if (CDSConfig::is_dumping_dynamic_archive()) {
925 // For dynamic dumping, we can resolve all the constraint classes for all class loaders during
926 // the initial run prior to creating the archive before vm exit. We will also perform verification
927 // check when running with the archive.
928 return false;
929 } else {
930 if (is_builtin(k)) {
931 // For builtin class loaders, we can try to complete the verification check at dump time,
932 // because we can resolve all the constraint classes. We will also perform verification check
933 // when running with the archive.
934 return false;
935 } else {
936 // For non-builtin class loaders, we cannot complete the verification check at dump time,
937 // because at dump time we don't know how to resolve classes for such loaders.
938 return true;
939 }
940 }
941 }
942
943 void SystemDictionaryShared::add_enum_klass_static_field(InstanceKlass* ik, int root_index) {
944 assert(CDSConfig::is_dumping_heap(), "sanity");
945 DumpTimeClassInfo* info = get_info_locked(ik);
946 info->add_enum_klass_static_field(root_index);
947 }
948
949 void SystemDictionaryShared::add_to_dump_time_lambda_proxy_class_dictionary(LambdaProxyClassKey& key,
950 InstanceKlass* proxy_klass) {
951 assert_lock_strong(DumpTimeTable_lock);
952
953 bool created;
954 DumpTimeLambdaProxyClassInfo* info = _dumptime_lambda_proxy_class_dictionary->put_if_absent(key, &created);
955 info->add_proxy_klass(proxy_klass);
956 if (created) {
957 ++_dumptime_lambda_proxy_class_dictionary->_count;
958 }
959 }
960
961 void SystemDictionaryShared::add_lambda_proxy_class(InstanceKlass* caller_ik,
962 InstanceKlass* lambda_ik,
963 Symbol* invoked_name,
964 Symbol* invoked_type,
965 Symbol* method_type,
966 Method* member_method,
967 Symbol* instantiated_method_type,
968 TRAPS) {
969 if (CDSConfig::is_dumping_invokedynamic()) {
970 // The lambda proxy classes will be stored as part of aot-resolved constant pool entries.
971 // There's no need to remember them in a separate table.
972 return;
973 }
974 if (CDSConfig::is_dumping_preimage_static_archive() || CDSConfig::is_dumping_final_static_archive()) {
975 // TODO: not supported in new workflow
976 return;
977 }
978
979 assert(caller_ik->class_loader() == lambda_ik->class_loader(), "mismatched class loader");
980 assert(caller_ik->class_loader_data() == lambda_ik->class_loader_data(), "mismatched class loader data");
981 assert(java_lang_Class::class_data(lambda_ik->java_mirror()) == nullptr, "must not have class data");
982
983 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
984
985 lambda_ik->assign_class_loader_type();
986 lambda_ik->set_shared_classpath_index(caller_ik->shared_classpath_index());
987 InstanceKlass* nest_host = caller_ik->nest_host(CHECK);
988 assert(nest_host != nullptr, "unexpected nullptr nest_host");
989
990 DumpTimeClassInfo* info = _dumptime_table->get(lambda_ik);
991 if (info != nullptr && !lambda_ik->is_non_strong_hidden() && is_builtin(lambda_ik) && is_builtin(caller_ik)
992 // Don't include the lambda proxy if its nest host is not in the "linked" state.
993 && nest_host->is_linked()) {
994 // Set _is_archived_lambda_proxy in DumpTimeClassInfo so that the lambda_ik
995 // won't be excluded during dumping of shared archive. See ExcludeDumpTimeSharedClasses.
996 info->_is_archived_lambda_proxy = true;
997 info->set_nest_host(nest_host);
998
999 LambdaProxyClassKey key(caller_ik,
1000 invoked_name,
1001 invoked_type,
1002 method_type,
1003 member_method,
1004 instantiated_method_type);
1005 add_to_dump_time_lambda_proxy_class_dictionary(key, lambda_ik);
1006 }
1007 }
1008
1009 InstanceKlass* SystemDictionaryShared::get_shared_lambda_proxy_class(InstanceKlass* caller_ik,
1010 Symbol* invoked_name,
1011 Symbol* invoked_type,
1012 Symbol* method_type,
1013 Method* member_method,
1014 Symbol* instantiated_method_type) {
1015 if (CDSConfig::is_dumping_final_static_archive()) {
1016 return nullptr;
1017 }
1018
1019 if (!caller_ik->is_shared() ||
1020 !invoked_name->is_shared() ||
1021 !invoked_type->is_shared() ||
1022 !method_type->is_shared() ||
1023 !member_method->is_shared() ||
1024 !instantiated_method_type->is_shared()) {
1025 // These can't be represented as u4 offset, but we wouldn't have archived a lambda proxy in this case anyway.
1026 return nullptr;
1027 }
1028
1029 MutexLocker ml(CDSLambda_lock, Mutex::_no_safepoint_check_flag);
1030 RunTimeLambdaProxyClassKey key =
1031 RunTimeLambdaProxyClassKey::init_for_runtime(caller_ik, invoked_name, invoked_type,
1032 method_type, member_method, instantiated_method_type);
1033
1034 // Try to retrieve the lambda proxy class from static archive.
1035 const RunTimeLambdaProxyClassInfo* info = _static_archive.lookup_lambda_proxy_class(&key);
1036 InstanceKlass* proxy_klass = retrieve_lambda_proxy_class(info);
1037 if (proxy_klass == nullptr) {
1038 if (info != nullptr && log_is_enabled(Debug, cds)) {
1039 ResourceMark rm;
1040 log_debug(cds)("Used all static archived lambda proxy classes for: %s %s%s",
1041 caller_ik->external_name(), invoked_name->as_C_string(), invoked_type->as_C_string());
1042 }
1043 } else {
1044 return proxy_klass;
1045 }
1046
1047 // Retrieving from static archive is unsuccessful, try dynamic archive.
1048 info = _dynamic_archive.lookup_lambda_proxy_class(&key);
1049 proxy_klass = retrieve_lambda_proxy_class(info);
1050 if (proxy_klass == nullptr) {
1051 if (info != nullptr && log_is_enabled(Debug, cds)) {
1052 ResourceMark rm;
1053 log_debug(cds)("Used all dynamic archived lambda proxy classes for: %s %s%s",
1054 caller_ik->external_name(), invoked_name->as_C_string(), invoked_type->as_C_string());
1055 }
1056 }
1057 return proxy_klass;
1058 }
1059
1060 InstanceKlass* SystemDictionaryShared::retrieve_lambda_proxy_class(const RunTimeLambdaProxyClassInfo* info) {
1061 InstanceKlass* proxy_klass = nullptr;
1062 if (info != nullptr) {
1063 InstanceKlass* curr_klass = info->proxy_klass_head();
1064 InstanceKlass* prev_klass = curr_klass;
1065 if (curr_klass->lambda_proxy_is_available()) {
1066 while (curr_klass->next_link() != nullptr) {
1067 prev_klass = curr_klass;
1068 curr_klass = InstanceKlass::cast(curr_klass->next_link());
1069 }
1070 assert(curr_klass->is_hidden(), "must be");
1071 assert(curr_klass->lambda_proxy_is_available(), "must be");
1072
1073 prev_klass->set_next_link(nullptr);
1074 proxy_klass = curr_klass;
1075 proxy_klass->clear_lambda_proxy_is_available();
1076 if (log_is_enabled(Debug, cds)) {
1077 ResourceMark rm;
1078 log_debug(cds)("Loaded lambda proxy: " PTR_FORMAT " %s ", p2i(proxy_klass), proxy_klass->external_name());
1079 }
1080 }
1081 }
1082 return proxy_klass;
1083 }
1084
1085 InstanceKlass* SystemDictionaryShared::get_shared_nest_host(InstanceKlass* lambda_ik) {
1086 assert(!CDSConfig::is_dumping_static_archive() && CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
1087 RunTimeClassInfo* record = RunTimeClassInfo::get_for(lambda_ik);
1088 return record->nest_host();
1089 }
1090
1091 InstanceKlass* SystemDictionaryShared::prepare_shared_lambda_proxy_class(InstanceKlass* lambda_ik,
1092 InstanceKlass* caller_ik, TRAPS) {
1093 Handle class_loader(THREAD, caller_ik->class_loader());
1094 Handle protection_domain;
1095 PackageEntry* pkg_entry = caller_ik->package();
1096 if (caller_ik->class_loader() != nullptr) {
1097 protection_domain = CDSProtectionDomain::init_security_info(class_loader, caller_ik, pkg_entry, CHECK_NULL);
1098 }
1099
1100 InstanceKlass* shared_nest_host = get_shared_nest_host(lambda_ik);
1101 assert(shared_nest_host != nullptr, "unexpected nullptr _nest_host");
1102
1103 InstanceKlass* loaded_lambda =
1104 SystemDictionary::load_shared_lambda_proxy_class(lambda_ik, class_loader, protection_domain, pkg_entry, CHECK_NULL);
1105
1106 if (loaded_lambda == nullptr) {
1107 return nullptr;
1108 }
1109
1110 // Ensures the nest host is the same as the lambda proxy's
1111 // nest host recorded at dump time.
1112 InstanceKlass* nest_host = caller_ik->nest_host(THREAD);
1113 assert(nest_host == shared_nest_host, "mismatched nest host");
1114
1115 EventClassLoad class_load_start_event;
1116
1117 // Add to class hierarchy, and do possible deoptimizations.
1118 loaded_lambda->add_to_hierarchy(THREAD);
1119 // But, do not add to dictionary.
1120
1121 loaded_lambda->link_class(CHECK_NULL);
1122 // notify jvmti
1123 if (JvmtiExport::should_post_class_load()) {
1124 JvmtiExport::post_class_load(THREAD, loaded_lambda);
1125 }
1126 if (class_load_start_event.should_commit()) {
1127 SystemDictionary::post_class_load_event(&class_load_start_event, loaded_lambda, ClassLoaderData::class_loader_data(class_loader()));
1128 }
1129
1130 loaded_lambda->initialize(CHECK_NULL);
1131
1132 return loaded_lambda;
1133 }
1134
1135 void SystemDictionaryShared::check_verification_constraints(InstanceKlass* klass,
1136 TRAPS) {
1137 //assert(!CDSConfig::is_dumping_static_archive() && CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
1138 RunTimeClassInfo* record = RunTimeClassInfo::get_for(klass);
1139
1140 int length = record->num_verifier_constraints();
1141 if (length > 0) {
1142 for (int i = 0; i < length; i++) {
1143 RunTimeClassInfo::RTVerifierConstraint* vc = record->verifier_constraint_at(i);
1144 Symbol* name = vc->name();
1145 Symbol* from_name = vc->from_name();
1146 char c = record->verifier_constraint_flag(i);
1147
1148 if (log_is_enabled(Trace, cds, verification)) {
1149 ResourceMark rm(THREAD);
1150 log_trace(cds, verification)("check_verification_constraint: %s: %s must be subclass of %s [0x%x]",
1151 klass->external_name(), from_name->as_klass_external_name(),
1152 name->as_klass_external_name(), c);
1153 }
1154
1155 bool from_field_is_protected = (c & SystemDictionaryShared::FROM_FIELD_IS_PROTECTED) ? true : false;
1156 bool from_is_array = (c & SystemDictionaryShared::FROM_IS_ARRAY) ? true : false;
1157 bool from_is_object = (c & SystemDictionaryShared::FROM_IS_OBJECT) ? true : false;
1158
1159 bool ok = VerificationType::resolve_and_check_assignability(klass, name,
1160 from_name, from_field_is_protected, from_is_array, from_is_object, CHECK);
1161 if (!ok) {
1162 ResourceMark rm(THREAD);
1163 stringStream ss;
1164
1165 ss.print_cr("Bad type on operand stack");
1166 ss.print_cr("Exception Details:");
1167 ss.print_cr(" Location:\n %s", klass->name()->as_C_string());
1168 ss.print_cr(" Reason:\n Type '%s' is not assignable to '%s'",
1169 from_name->as_quoted_ascii(), name->as_quoted_ascii());
1170 THROW_MSG(vmSymbols::java_lang_VerifyError(), ss.as_string());
1171 }
1172 }
1173 }
1174 }
1175
1176 static oop get_class_loader_by(char type) {
1177 if (type == (char)ClassLoader::BOOT_LOADER) {
1178 return (oop)nullptr;
1179 } else if (type == (char)ClassLoader::PLATFORM_LOADER) {
1180 return SystemDictionary::java_platform_loader();
1181 } else {
1182 assert (type == (char)ClassLoader::APP_LOADER, "Sanity");
1183 return SystemDictionary::java_system_loader();
1184 }
1185 }
1186
1187 // Record class loader constraints that are checked inside
1188 // InstanceKlass::link_class(), so that these can be checked quickly
1189 // at runtime without laying out the vtable/itables.
1190 void SystemDictionaryShared::record_linking_constraint(Symbol* name, InstanceKlass* klass,
1191 Handle loader1, Handle loader2) {
1192 // A linking constraint check is executed when:
1193 // - klass extends or implements type S
1194 // - klass overrides method S.M(...) with X.M
1195 // - If klass defines the method M, X is
1196 // the same as klass.
1197 // - If klass does not define the method M,
1198 // X must be a supertype of klass and X.M is
1199 // a default method defined by X.
1200 // - loader1 = X->class_loader()
1201 // - loader2 = S->class_loader()
1202 // - loader1 != loader2
1203 // - M's parameter(s) include an object type T
1204 // We require that
1205 // - whenever loader1 and loader2 try to
1206 // resolve the type T, they must always resolve to
1207 // the same InstanceKlass.
1208 // NOTE: type T may or may not be currently resolved in
1209 // either of these two loaders. The check itself does not
1210 // try to resolve T.
1211 oop klass_loader = klass->class_loader();
1212
1213 if (!is_system_class_loader(klass_loader) &&
1214 !is_platform_class_loader(klass_loader)) {
1215 // If klass is loaded by system/platform loaders, we can
1216 // guarantee that klass and S must be loaded by the same
1217 // respective loader between dump time and run time, and
1218 // the exact same check on (name, loader1, loader2) will
1219 // be executed. Hence, we can cache this check and execute
1220 // it at runtime without walking the vtable/itables.
1221 //
1222 // This cannot be guaranteed for classes loaded by other
1223 // loaders, so we bail.
1224 return;
1225 }
1226
1227 assert(is_builtin(klass), "must be");
1228 assert(klass_loader != nullptr, "should not be called for boot loader");
1229 assert(loader1 != loader2, "must be");
1230
1231 if (CDSConfig::is_dumping_dynamic_archive() && Thread::current()->is_VM_thread()) {
1232 // We are re-laying out the vtable/itables of the *copy* of
1233 // a class during the final stage of dynamic dumping. The
1234 // linking constraints for this class has already been recorded.
1235 return;
1236 }
1237 assert(!Thread::current()->is_VM_thread(), "must be");
1238
1239 assert(CDSConfig::is_dumping_archive(), "sanity");
1240 DumpTimeClassInfo* info = get_info(klass);
1241 info->record_linking_constraint(name, loader1, loader2);
1242 }
1243
1244 // returns true IFF there's no need to re-initialize the i/v-tables for klass for
1245 // the purpose of checking class loader constraints.
1246 bool SystemDictionaryShared::check_linking_constraints(Thread* current, InstanceKlass* klass) {
1247 //assert(!CDSConfig::is_dumping_static_archive() && CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
1248 LogTarget(Info, class, loader, constraints) log;
1249 if (klass->is_shared_boot_class()) {
1250 // No class loader constraint check performed for boot classes.
1251 return true;
1252 }
1253 if (klass->is_shared_platform_class() || klass->is_shared_app_class()) {
1254 RunTimeClassInfo* info = RunTimeClassInfo::get_for(klass);
1255 assert(info != nullptr, "Sanity");
1256 if (info->num_loader_constraints() > 0) {
1257 HandleMark hm(current);
1258 for (int i = 0; i < info->num_loader_constraints(); i++) {
1259 RunTimeClassInfo::RTLoaderConstraint* lc = info->loader_constraint_at(i);
1260 Symbol* name = lc->constraint_name();
1261 Handle loader1(current, get_class_loader_by(lc->_loader_type1));
1262 Handle loader2(current, get_class_loader_by(lc->_loader_type2));
1263 if (log.is_enabled()) {
1264 ResourceMark rm(current);
1265 log.print("[CDS add loader constraint for class %s symbol %s loader[0] %s loader[1] %s",
1266 klass->external_name(), name->as_C_string(),
1267 ClassLoaderData::class_loader_data(loader1())->loader_name_and_id(),
1268 ClassLoaderData::class_loader_data(loader2())->loader_name_and_id());
1269 }
1270 if (!SystemDictionary::add_loader_constraint(name, klass, loader1, loader2)) {
1271 // Loader constraint violation has been found. The caller
1272 // will re-layout the vtable/itables to produce the correct
1273 // exception.
1274 if (log.is_enabled()) {
1275 log.print(" failed]");
1276 }
1277 return false;
1278 }
1279 if (log.is_enabled()) {
1280 log.print(" succeeded]");
1281 }
1282 }
1283 return true; // for all recorded constraints added successfully.
1284 }
1285 }
1286 if (log.is_enabled()) {
1287 ResourceMark rm(current);
1288 log.print("[CDS has not recorded loader constraint for class %s]", klass->external_name());
1289 }
1290 return false;
1291 }
1292
1293 bool SystemDictionaryShared::is_supported_invokedynamic(BootstrapInfo* bsi) {
1294 LogTarget(Debug, cds, lambda) log;
1295 if (bsi->arg_values() == nullptr || !bsi->arg_values()->is_objArray()) {
1296 if (log.is_enabled()) {
1297 LogStream log_stream(log);
1298 log.print("bsi check failed");
1299 log.print(" bsi->arg_values().not_null() %d", bsi->arg_values().not_null());
1300 if (bsi->arg_values().not_null()) {
1301 log.print(" bsi->arg_values()->is_objArray() %d", bsi->arg_values()->is_objArray());
1302 bsi->print_msg_on(&log_stream);
1303 }
1304 }
1305 return false;
1306 }
1307
1308 Handle bsm = bsi->bsm();
1309 if (bsm.is_null() || !java_lang_invoke_DirectMethodHandle::is_instance(bsm())) {
1310 if (log.is_enabled()) {
1311 log.print("bsm check failed");
1312 log.print(" bsm.is_null() %d", bsm.is_null());
1313 log.print(" java_lang_invoke_DirectMethodHandle::is_instance(bsm()) %d",
1314 java_lang_invoke_DirectMethodHandle::is_instance(bsm()));
1315 }
1316 return false;
1317 }
1318
1319 oop mn = java_lang_invoke_DirectMethodHandle::member(bsm());
1320 Method* method = java_lang_invoke_MemberName::vmtarget(mn);
1321 if (method->klass_name()->equals("java/lang/invoke/LambdaMetafactory") &&
1322 method->name()->equals("metafactory") &&
1323 method->signature()->equals("(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;"
1324 "Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;"
1325 "Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;")) {
1326 return true;
1327 } else {
1328 if (log.is_enabled()) {
1329 ResourceMark rm;
1330 log.print("method check failed");
1331 log.print(" klass_name() %s", method->klass_name()->as_C_string());
1332 log.print(" name() %s", method->name()->as_C_string());
1333 log.print(" signature() %s", method->signature()->as_C_string());
1334 }
1335 }
1336
1337 return false;
1338 }
1339
1340 class EstimateSizeForArchive : StackObj {
1341 size_t _shared_class_info_size;
1342 int _num_builtin_klasses;
1343 int _num_unregistered_klasses;
1344
1345 public:
1346 EstimateSizeForArchive() {
1347 _shared_class_info_size = 0;
1348 _num_builtin_klasses = 0;
1349 _num_unregistered_klasses = 0;
1350 }
1351
1352 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
1353 if (!info.is_excluded()) {
1354 size_t byte_size = info.runtime_info_bytesize();
1355 _shared_class_info_size += align_up(byte_size, SharedSpaceObjectAlignment);
1356 }
1357 }
1358
1359 size_t total() {
1360 return _shared_class_info_size;
1361 }
1362 };
1363
1364 size_t SystemDictionaryShared::estimate_size_for_archive() {
1365 EstimateSizeForArchive est;
1366 _dumptime_table->iterate_all_live_classes(&est);
1367 size_t total_size = est.total() +
1368 CompactHashtableWriter::estimate_size(_dumptime_table->count_of(true)) +
1369 CompactHashtableWriter::estimate_size(_dumptime_table->count_of(false));
1370
1371 size_t bytesize = align_up(sizeof(RunTimeLambdaProxyClassInfo), SharedSpaceObjectAlignment);
1372 total_size +=
1373 (bytesize * _dumptime_lambda_proxy_class_dictionary->_count) +
1374 CompactHashtableWriter::estimate_size(_dumptime_lambda_proxy_class_dictionary->_count);
1375
1376 return total_size;
1377 }
1378
1379 unsigned int SystemDictionaryShared::hash_for_shared_dictionary(address ptr) {
1380 if (ArchiveBuilder::is_active() && ArchiveBuilder::current()->is_in_buffer_space(ptr)) {
1381 uintx offset = ArchiveBuilder::current()->any_to_offset(ptr);
1382 unsigned int hash = primitive_hash<uintx>(offset);
1383 DEBUG_ONLY({
1384 if (MetaspaceObj::is_shared((const MetaspaceObj*)ptr)) {
1385 assert(hash == SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr), "must be");
1386 }
1387 });
1388 return hash;
1389 } else {
1390 return SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr);
1391 }
1392 }
1393
1394 class CopyLambdaProxyClassInfoToArchive : StackObj {
1395 CompactHashtableWriter* _writer;
1396 ArchiveBuilder* _builder;
1397 public:
1398 CopyLambdaProxyClassInfoToArchive(CompactHashtableWriter* writer)
1399 : _writer(writer), _builder(ArchiveBuilder::current()) {}
1400 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
1401 // In static dump, info._proxy_klasses->at(0) is already relocated to point to the archived class
1402 // (not the original class).
1403 //
1404 // The following check has been moved to SystemDictionaryShared::find_all_archivable_classes(), which
1405 // happens before the classes are copied.
1406 //
1407 // if (SystemDictionaryShared::is_excluded_class(info._proxy_klasses->at(0))) {
1408 // return true;
1409 //}
1410 ResourceMark rm;
1411 log_info(cds,dynamic)("Archiving hidden %s", info._proxy_klasses->at(0)->external_name());
1412 size_t byte_size = sizeof(RunTimeLambdaProxyClassInfo);
1413 RunTimeLambdaProxyClassInfo* runtime_info =
1414 (RunTimeLambdaProxyClassInfo*)ArchiveBuilder::ro_region_alloc(byte_size);
1415 runtime_info->init(key, info);
1416 unsigned int hash = runtime_info->hash();
1417 u4 delta = _builder->any_to_offset_u4((void*)runtime_info);
1418 _writer->add(hash, delta);
1419 return true;
1420 }
1421 };
1422
1423 class AdjustLambdaProxyClassInfo : StackObj {
1424 public:
1425 AdjustLambdaProxyClassInfo() {}
1426 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
1427 int len = info._proxy_klasses->length();
1428 InstanceKlass* last_buff_k = nullptr;
1429
1430 for (int i = len - 1; i >= 0; i--) {
1431 InstanceKlass* orig_k = info._proxy_klasses->at(i);
1432 InstanceKlass* buff_k = ArchiveBuilder::current()->get_buffered_addr(orig_k);
1433 assert(ArchiveBuilder::current()->is_in_buffer_space(buff_k), "must be");
1434 buff_k->set_lambda_proxy_is_available();
1435 buff_k->set_next_link(last_buff_k);
1436 if (last_buff_k != nullptr) {
1437 ArchivePtrMarker::mark_pointer(buff_k->next_link_addr());
1438 }
1439 last_buff_k = buff_k;
1440 }
1441
1442 return true;
1443 }
1444 };
1445
1446 class CopySharedClassInfoToArchive : StackObj {
1447 CompactHashtableWriter* _writer;
1448 bool _is_builtin;
1449 ArchiveBuilder *_builder;
1450 public:
1451 CopySharedClassInfoToArchive(CompactHashtableWriter* writer,
1452 bool is_builtin)
1453 : _writer(writer), _is_builtin(is_builtin), _builder(ArchiveBuilder::current()) {}
1454
1455 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
1456 if (!info.is_excluded() && info.is_builtin() == _is_builtin) {
1457 size_t byte_size = info.runtime_info_bytesize();
1458 RunTimeClassInfo* record;
1459 record = (RunTimeClassInfo*)ArchiveBuilder::ro_region_alloc(byte_size);
1460 record->init(info);
1461
1462 unsigned int hash;
1463 Symbol* name = info._klass->name();
1464 name = ArchiveBuilder::current()->get_buffered_addr(name);
1465 hash = SystemDictionaryShared::hash_for_shared_dictionary((address)name);
1466 u4 delta = _builder->buffer_to_offset_u4((address)record);
1467 if (_is_builtin && info._klass->is_hidden()) {
1468 // skip
1469 } else {
1470 _writer->add(hash, delta);
1471 }
1472 if (log_is_enabled(Trace, cds, hashtables)) {
1473 ResourceMark rm;
1474 log_trace(cds,hashtables)("%s dictionary: %s", (_is_builtin ? "builtin" : "unregistered"), info._klass->external_name());
1475 }
1476
1477 // Save this for quick runtime lookup of InstanceKlass* -> RunTimeClassInfo*
1478 InstanceKlass* buffered_klass = ArchiveBuilder::current()->get_buffered_addr(info._klass);
1479 RunTimeClassInfo::set_for(buffered_klass, record);
1480 }
1481 }
1482 };
1483
1484 void SystemDictionaryShared::write_lambda_proxy_class_dictionary(LambdaProxyClassDictionary *dictionary) {
1485 CompactHashtableStats stats;
1486 dictionary->reset();
1487 CompactHashtableWriter writer(_dumptime_lambda_proxy_class_dictionary->_count, &stats);
1488 CopyLambdaProxyClassInfoToArchive copy(&writer);
1489 _dumptime_lambda_proxy_class_dictionary->iterate(©);
1490 writer.dump(dictionary, "lambda proxy class dictionary");
1491 }
1492
1493 void SystemDictionaryShared::write_dictionary(RunTimeSharedDictionary* dictionary,
1494 bool is_builtin) {
1495 CompactHashtableStats stats;
1496 dictionary->reset();
1497 CompactHashtableWriter writer(_dumptime_table->count_of(is_builtin), &stats);
1498 CopySharedClassInfoToArchive copy(&writer, is_builtin);
1499 assert_lock_strong(DumpTimeTable_lock);
1500 _dumptime_table->iterate_all_live_classes(©);
1501 writer.dump(dictionary, is_builtin ? "builtin dictionary" : "unregistered dictionary");
1502 }
1503
1504 void SystemDictionaryShared::write_to_archive(bool is_static_archive) {
1505 ArchiveInfo* archive = get_archive(is_static_archive);
1506
1507 write_dictionary(&archive->_builtin_dictionary, true);
1508 write_dictionary(&archive->_unregistered_dictionary, false);
1509
1510 write_lambda_proxy_class_dictionary(&archive->_lambda_proxy_class_dictionary);
1511 }
1512
1513 void SystemDictionaryShared::adjust_lambda_proxy_class_dictionary() {
1514 AdjustLambdaProxyClassInfo adjuster;
1515 _dumptime_lambda_proxy_class_dictionary->iterate(&adjuster);
1516 }
1517
1518 void SystemDictionaryShared::serialize_dictionary_headers(SerializeClosure* soc,
1519 bool is_static_archive) {
1520 ArchiveInfo* archive = get_archive(is_static_archive);
1521
1522 archive->_builtin_dictionary.serialize_header(soc);
1523 archive->_unregistered_dictionary.serialize_header(soc);
1524 archive->_lambda_proxy_class_dictionary.serialize_header(soc);
1525 }
1526
1527 void SystemDictionaryShared::serialize_vm_classes(SerializeClosure* soc) {
1528 for (auto id : EnumRange<vmClassID>{}) {
1529 soc->do_ptr(vmClasses::klass_addr_at(id));
1530 }
1531 }
1532
1533 const RunTimeClassInfo*
1534 SystemDictionaryShared::find_record(RunTimeSharedDictionary* static_dict, RunTimeSharedDictionary* dynamic_dict, Symbol* name) {
1535 if (!CDSConfig::is_using_archive() || !name->is_shared()) {
1536 // The names of all shared classes must also be a shared Symbol.
1537 return nullptr;
1538 }
1539
1540 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(name);
1541 const RunTimeClassInfo* record = nullptr;
1542 if (DynamicArchive::is_mapped()) {
1543 // Use the regenerated holder classes in the dynamic archive as they
1544 // have more methods than those in the base archive.
1545 if (LambdaFormInvokers::may_be_regenerated_class(name)) {
1546 record = dynamic_dict->lookup(name, hash, 0);
1547 if (record != nullptr) {
1548 return record;
1549 }
1550 }
1551 }
1552
1553 if (!MetaspaceShared::is_shared_dynamic(name)) {
1554 // The names of all shared classes in the static dict must also be in the
1555 // static archive
1556 record = static_dict->lookup(name, hash, 0);
1557 }
1558
1559 if (record == nullptr && DynamicArchive::is_mapped()) {
1560 record = dynamic_dict->lookup(name, hash, 0);
1561 }
1562
1563 return record;
1564 }
1565
1566 InstanceKlass* SystemDictionaryShared::find_builtin_class(Symbol* name) {
1567 const RunTimeClassInfo* record = find_record(&_static_archive._builtin_dictionary,
1568 &_dynamic_archive._builtin_dictionary,
1569 name);
1570 if (record != nullptr) {
1571 assert(!record->klass()->is_hidden(), "hidden class cannot be looked up by name");
1572 DEBUG_ONLY(check_klass_after_loading(record->klass());)
1573 // We did not save the classfile data of the generated LambdaForm invoker classes,
1574 // so we cannot support CLFH for such classes.
1575 if (record->klass()->is_generated_shared_class() && JvmtiExport::should_post_class_file_load_hook()) {
1576 return nullptr;
1577 }
1578 return record->klass();
1579 } else {
1580 return nullptr;
1581 }
1582 }
1583
1584 void SystemDictionaryShared::update_shared_entry(InstanceKlass* k, int id) {
1585 assert(CDSConfig::is_dumping_static_archive(), "class ID is used only for static dump (from classlist)");
1586 DumpTimeClassInfo* info = get_info(k);
1587 info->_id = id;
1588 }
1589
1590 const char* SystemDictionaryShared::class_loader_name_for_shared(Klass* k) {
1591 assert(k != nullptr, "Sanity");
1592 assert(k->is_shared(), "Must be");
1593 assert(k->is_instance_klass(), "Must be");
1594 InstanceKlass* ik = InstanceKlass::cast(k);
1595 if (ik->is_shared_boot_class()) {
1596 return "boot_loader";
1597 } else if (ik->is_shared_platform_class()) {
1598 return "platform_loader";
1599 } else if (ik->is_shared_app_class()) {
1600 return "app_loader";
1601 } else if (ik->is_shared_unregistered_class()) {
1602 return "unregistered_loader";
1603 } else {
1604 return "unknown loader";
1605 }
1606 }
1607
1608 class SharedDictionaryPrinter : StackObj {
1609 outputStream* _st;
1610 int _index;
1611 public:
1612 SharedDictionaryPrinter(outputStream* st) : _st(st), _index(0) {}
1613
1614 void do_value(const RunTimeClassInfo* record) {
1615 ResourceMark rm;
1616 _st->print_cr("%4d: %s %s", _index++, record->klass()->external_name(),
1617 SystemDictionaryShared::class_loader_name_for_shared(record->klass()));
1618 if (record->klass()->array_klasses() != nullptr) {
1619 record->klass()->array_klasses()->cds_print_value_on(_st);
1620 _st->cr();
1621 }
1622 }
1623 int index() const { return _index; }
1624 };
1625
1626 class SharedLambdaDictionaryPrinter : StackObj {
1627 outputStream* _st;
1628 int _index;
1629 public:
1630 SharedLambdaDictionaryPrinter(outputStream* st, int idx) : _st(st), _index(idx) {}
1631
1632 void do_value(const RunTimeLambdaProxyClassInfo* record) {
1633 if (record->proxy_klass_head()->lambda_proxy_is_available()) {
1634 ResourceMark rm;
1635 Klass* k = record->proxy_klass_head();
1636 while (k != nullptr) {
1637 _st->print_cr("%4d: %s %s", _index++, k->external_name(),
1638 SystemDictionaryShared::class_loader_name_for_shared(k));
1639 k = k->next_link();
1640 }
1641 }
1642 }
1643 };
1644
1645 void SystemDictionaryShared::ArchiveInfo::print_on(const char* prefix,
1646 outputStream* st) {
1647 st->print_cr("%sShared Dictionary", prefix);
1648 SharedDictionaryPrinter p(st);
1649 st->print_cr("%sShared Builtin Dictionary", prefix);
1650 _builtin_dictionary.iterate(&p);
1651 st->print_cr("%sShared Unregistered Dictionary", prefix);
1652 _unregistered_dictionary.iterate(&p);
1653 if (!_lambda_proxy_class_dictionary.empty()) {
1654 st->print_cr("%sShared Lambda Dictionary", prefix);
1655 SharedLambdaDictionaryPrinter ldp(st, p.index());
1656 _lambda_proxy_class_dictionary.iterate(&ldp);
1657 }
1658 }
1659
1660 void SystemDictionaryShared::ArchiveInfo::print_table_statistics(const char* prefix,
1661 outputStream* st) {
1662 st->print_cr("%sArchve Statistics", prefix);
1663 _builtin_dictionary.print_table_statistics(st, "Builtin Shared Dictionary");
1664 _unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary");
1665 _lambda_proxy_class_dictionary.print_table_statistics(st, "Lambda Shared Dictionary");
1666 }
1667
1668 void SystemDictionaryShared::print_shared_archive(outputStream* st, bool is_static) {
1669 if (CDSConfig::is_using_archive()) {
1670 if (is_static) {
1671 _static_archive.print_on("", st);
1672 } else {
1673 if (DynamicArchive::is_mapped()) {
1674 _dynamic_archive.print_on("Dynamic ", st);
1675 }
1676 }
1677 }
1678 }
1679
1680 void SystemDictionaryShared::print_on(outputStream* st) {
1681 print_shared_archive(st, true);
1682 print_shared_archive(st, false);
1683 }
1684
1685 void SystemDictionaryShared::print_table_statistics(outputStream* st) {
1686 if (CDSConfig::is_using_archive()) {
1687 _static_archive.print_table_statistics("Static ", st);
1688 if (DynamicArchive::is_mapped()) {
1689 _dynamic_archive.print_table_statistics("Dynamic ", st);
1690 }
1691 }
1692 }
1693
1694 bool SystemDictionaryShared::is_dumptime_table_empty() {
1695 assert_lock_strong(DumpTimeTable_lock);
1696 _dumptime_table->update_counts();
1697 if (_dumptime_table->count_of(true) == 0 && _dumptime_table->count_of(false) == 0){
1698 return true;
1699 }
1700 return false;
1701 }
1702
1703 class CleanupDumpTimeLambdaProxyClassTable: StackObj {
1704 public:
1705 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
1706 assert_lock_strong(DumpTimeTable_lock);
1707 InstanceKlass* caller_ik = key.caller_ik();
1708 InstanceKlass* nest_host = caller_ik->nest_host_not_null();
1709
1710 // If the caller class and/or nest_host are excluded, the associated lambda proxy
1711 // must also be excluded.
1712 bool always_exclude = SystemDictionaryShared::check_for_exclusion(caller_ik, nullptr) ||
1713 SystemDictionaryShared::check_for_exclusion(nest_host, nullptr);
1714
1715 for (int i = info._proxy_klasses->length() - 1; i >= 0; i--) {
1716 InstanceKlass* ik = info._proxy_klasses->at(i);
1717 if (always_exclude || SystemDictionaryShared::check_for_exclusion(ik, nullptr)) {
1718 SystemDictionaryShared::reset_registered_lambda_proxy_class(ik);
1719 info._proxy_klasses->remove_at(i);
1720 }
1721 }
1722 return info._proxy_klasses->length() == 0 ? true /* delete the node*/ : false;
1723 }
1724 };
1725
1726 void SystemDictionaryShared::cleanup_lambda_proxy_class_dictionary() {
1727 assert_lock_strong(DumpTimeTable_lock);
1728 CleanupDumpTimeLambdaProxyClassTable cleanup_proxy_classes;
1729 _dumptime_lambda_proxy_class_dictionary->unlink(&cleanup_proxy_classes);
1730 }
1731
1732 void SystemDictionaryShared::create_loader_positive_lookup_cache(TRAPS) {
1733 GrowableArray<InstanceKlass*> shared_classes_list;
1734 {
1735 // With static dumping, we have only a single Java thread (see JVM_StartThread) so
1736 // no no other threads should be loading classes. Otherwise, the code below may miss some
1737 // classes that are loaded concurrently.
1738 assert(CDSConfig::is_dumping_static_archive(), "no other threads should be loading classes");
1739
1740 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
1741 _dumptime_table->iterate_all_classes_in_builtin_loaders([&](InstanceKlass* k, DumpTimeClassInfo& info) {
1742 if (!k->is_hidden() && !check_for_exclusion(k, &info)) {
1743 shared_classes_list.append(k);
1744 }
1745 }
1746 );
1747 }
1748
1749 InstanceKlass* ik = vmClasses::Class_klass();
1750 objArrayOop r = oopFactory::new_objArray(ik, shared_classes_list.length(), CHECK);
1751 objArrayHandle array_h(THREAD, r);
1752
1753 for (int i = 0; i < shared_classes_list.length(); i++) {
1754 oop mirror = shared_classes_list.at(i)->java_mirror();
1755 Handle mirror_h(THREAD, mirror);
1756 array_h->obj_at_put(i, mirror_h());
1757 }
1758
1759 TempNewSymbol method = SymbolTable::new_symbol("generatePositiveLookupCache");
1760 TempNewSymbol signature = SymbolTable::new_symbol("([Ljava/lang/Class;)V");
1761
1762 JavaCallArguments args(Handle(THREAD, SystemDictionary::java_system_loader()));
1763 args.push_oop(array_h);
1764 JavaValue result(T_VOID);
1765 JavaCalls::call_virtual(&result,
1766 vmClasses::jdk_internal_loader_ClassLoaders_AppClassLoader_klass(),
1767 method,
1768 signature,
1769 &args,
1770 CHECK);
1771
1772 if (HAS_PENDING_EXCEPTION) {
1773 Handle exc_handle(THREAD, PENDING_EXCEPTION);
1774 CLEAR_PENDING_EXCEPTION;
1775 ResourceMark rm(THREAD);
1776
1777 log_warning(cds)("Exception during AppClassLoader::generatePositiveLookupCache() call");
1778 LogStreamHandle(Debug, cds) log;
1779 if (log.is_enabled()) {
1780 java_lang_Throwable::print_stack_trace(exc_handle, &log);
1781 }
1782 return;
1783 }
1784 }