1 /*
2 * Copyright (c) 2014, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassFilter.hpp"
26 #include "cds/aotClassLocation.hpp"
27 #include "cds/aotLogging.hpp"
28 #include "cds/archiveBuilder.hpp"
29 #include "cds/archiveUtils.hpp"
30 #include "cds/cdsConfig.hpp"
31 #include "cds/cdsProtectionDomain.hpp"
32 #include "cds/classListParser.hpp"
33 #include "cds/classListWriter.hpp"
34 #include "cds/dumpTimeClassInfo.inline.hpp"
35 #include "cds/dynamicArchive.hpp"
36 #include "cds/filemap.hpp"
37 #include "cds/heapShared.hpp"
38 #include "cds/lambdaProxyClassDictionary.hpp"
39 #include "cds/lambdaFormInvokers.inline.hpp"
40 #include "cds/metaspaceShared.hpp"
41 #include "cds/runTimeClassInfo.hpp"
42 #include "cds/unregisteredClasses.hpp"
43 #include "classfile/classFileStream.hpp"
44 #include "classfile/classLoader.hpp"
45 #include "classfile/classLoaderData.inline.hpp"
46 #include "classfile/classLoaderDataGraph.hpp"
47 #include "classfile/classLoaderExt.hpp"
48 #include "classfile/dictionary.hpp"
49 #include "classfile/javaClasses.hpp"
50 #include "classfile/javaClasses.inline.hpp"
51 #include "classfile/symbolTable.hpp"
52 #include "classfile/systemDictionary.hpp"
53 #include "classfile/systemDictionaryShared.hpp"
54 #include "classfile/verificationType.hpp"
55 #include "classfile/vmClasses.hpp"
56 #include "classfile/vmSymbols.hpp"
57 #include "jfr/jfrEvents.hpp"
58 #include "logging/log.hpp"
59 #include "logging/logStream.hpp"
60 #include "memory/allocation.hpp"
61 #include "memory/metadataFactory.hpp"
62 #include "memory/metaspaceClosure.hpp"
63 #include "memory/oopFactory.hpp"
64 #include "memory/resourceArea.hpp"
65 #include "memory/universe.hpp"
66 #include "oops/compressedKlass.inline.hpp"
67 #include "oops/instanceKlass.hpp"
68 #include "oops/klass.inline.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
87 // Used by NoClassLoadingMark
88 DEBUG_ONLY(bool SystemDictionaryShared::_class_loading_may_happen = true;)
89
90 #ifdef ASSERT
91 static void check_klass_after_loading(const Klass* k) {
92 #ifdef _LP64
93 if (k != nullptr && UseCompressedClassPointers && k->needs_narrow_id()) {
94 CompressedKlassPointers::check_encodable(k);
95 }
96 #endif
97 }
98 #endif
99
100 InstanceKlass* SystemDictionaryShared::load_shared_class_for_builtin_loader(
101 Symbol* class_name, Handle class_loader, TRAPS) {
102 assert(CDSConfig::is_using_archive(), "must be");
103 InstanceKlass* ik = find_builtin_class(class_name);
104
105 if (ik != nullptr && !ik->shared_loading_failed()) {
106 if ((SystemDictionary::is_system_class_loader(class_loader()) && ik->defined_by_app_loader()) ||
107 (SystemDictionary::is_platform_class_loader(class_loader()) && ik->defined_by_platform_loader())) {
108 SharedClassLoadingMark slm(THREAD, ik);
109 PackageEntry* pkg_entry = CDSProtectionDomain::get_package_entry_from_class(ik, class_loader);
110 Handle protection_domain =
111 CDSProtectionDomain::init_security_info(class_loader, ik, pkg_entry, CHECK_NULL);
112 return load_shared_class(ik, class_loader, protection_domain, nullptr, pkg_entry, THREAD);
113 }
114 }
115 return nullptr;
116 }
117
118 // This function is called for loading only UNREGISTERED classes
119 InstanceKlass* SystemDictionaryShared::lookup_from_stream(Symbol* class_name,
120 Handle class_loader,
121 Handle protection_domain,
122 const ClassFileStream* cfs,
123 TRAPS) {
124 if (!CDSConfig::is_using_archive()) {
125 return nullptr;
126 }
127 if (class_name == nullptr) { // don't do this for hidden classes
128 return nullptr;
129 }
130 if (class_loader.is_null() ||
131 SystemDictionary::is_system_class_loader(class_loader()) ||
132 SystemDictionary::is_platform_class_loader(class_loader())) {
133 // Do nothing for the BUILTIN loaders.
134 return nullptr;
135 }
136
137 const RunTimeClassInfo* record = find_record(&_static_archive._unregistered_dictionary,
138 &_dynamic_archive._unregistered_dictionary,
139 class_name);
140 if (record == nullptr) {
141 return nullptr;
142 }
143
144 int clsfile_size = cfs->length();
145 int clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
146
147 if (!record->matches(clsfile_size, clsfile_crc32)) {
148 return nullptr;
149 }
150
151 return acquire_class_for_current_thread(record->klass(), class_loader,
152 protection_domain, cfs,
153 THREAD);
154 }
155
156 InstanceKlass* SystemDictionaryShared::acquire_class_for_current_thread(
157 InstanceKlass *ik,
158 Handle class_loader,
159 Handle protection_domain,
160 const ClassFileStream *cfs,
161 TRAPS) {
162 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader());
163
164 {
165 MutexLocker mu(THREAD, SharedDictionary_lock);
166 if (ik->class_loader_data() != nullptr) {
167 // ik is already loaded (by this loader or by a different loader)
168 // or ik is being loaded by a different thread (by this loader or by a different loader)
169 return nullptr;
170 }
171
172 // No other thread has acquired this yet, so give it to *this thread*
173 ik->set_class_loader_data(loader_data);
174 }
175
176 // No longer holding SharedDictionary_lock
177 // No need to lock, as <ik> can be held only by a single thread.
178 loader_data->add_class(ik);
179
180 // Get the package entry.
181 PackageEntry* pkg_entry = CDSProtectionDomain::get_package_entry_from_class(ik, class_loader);
182
183 // Load and check super/interfaces, restore unshareable info
184 InstanceKlass* shared_klass = load_shared_class(ik, class_loader, protection_domain,
185 cfs, pkg_entry, THREAD);
186 if (shared_klass == nullptr || HAS_PENDING_EXCEPTION) {
187 // TODO: clean up <ik> so it can be used again
188 return nullptr;
189 }
190
191 return shared_klass;
192 }
193
194 // Guaranteed to return non-null value for non-shared classes.
195 // k must not be a shared class.
196 DumpTimeClassInfo* SystemDictionaryShared::get_info(InstanceKlass* k) {
197 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
198 return get_info_locked(k);
199 }
200
201 DumpTimeClassInfo* SystemDictionaryShared::get_info_locked(InstanceKlass* k) {
202 assert_lock_strong(DumpTimeTable_lock);
203 DumpTimeClassInfo* info = _dumptime_table->get_info(k);
204 assert(info != nullptr, "must be");
205 return info;
206 }
207
208 bool SystemDictionaryShared::check_for_exclusion(InstanceKlass* k, DumpTimeClassInfo* info) {
209 if (CDSConfig::is_dumping_dynamic_archive() && MetaspaceShared::is_in_shared_metaspace(k)) {
210 // We have reached a super type that's already in the base archive. Treat it
211 // as "not excluded".
212 return false;
213 }
214
215 if (info == nullptr) {
216 info = _dumptime_table->get(k);
217 assert(info != nullptr, "supertypes of any classes in _dumptime_table must either be shared, or must also be in _dumptime_table");
218 }
219
220 if (!info->has_checked_exclusion()) {
221 if (check_for_exclusion_impl(k)) {
222 info->set_excluded();
223 }
224 info->set_has_checked_exclusion();
225 }
226
227 return info->is_excluded();
228 }
229
230 // Returns true so the caller can do: return warn_excluded(".....");
231 bool SystemDictionaryShared::warn_excluded(InstanceKlass* k, const char* reason) {
232 ResourceMark rm;
233 aot_log_warning(aot)("Skipping %s: %s", k->name()->as_C_string(), reason);
234 return true;
235 }
236
237 bool SystemDictionaryShared::is_jfr_event_class(InstanceKlass *k) {
238 while (k) {
239 if (k->name()->equals("jdk/internal/event/Event")) {
240 return true;
241 }
242 k = k->java_super();
243 }
244 return false;
245 }
246
247 bool SystemDictionaryShared::is_early_klass(InstanceKlass* ik) {
248 DumpTimeClassInfo* info = _dumptime_table->get(ik);
249 return (info != nullptr) ? info->is_early_klass() : false;
250 }
251
252 bool SystemDictionaryShared::check_for_exclusion_impl(InstanceKlass* k) {
253 if (CDSConfig::is_dumping_final_static_archive() && k->defined_by_other_loaders()
254 && k->is_shared()) {
255 return false; // Do not exclude: unregistered classes are passed from preimage to final image.
256 }
257
258 if (k->is_in_error_state()) {
259 return warn_excluded(k, "In error state");
260 }
261 if (k->is_scratch_class()) {
262 return warn_excluded(k, "A scratch class");
263 }
264 if (!k->is_loaded()) {
265 return warn_excluded(k, "Not in loaded state");
266 }
267 if (has_been_redefined(k)) {
268 return warn_excluded(k, "Has been redefined");
269 }
270 if (!k->is_hidden() && k->shared_classpath_index() < 0 && is_builtin(k)) {
271 if (k->name()->starts_with("java/lang/invoke/BoundMethodHandle$Species_")) {
272 // This class is dynamically generated by the JDK
273 if (CDSConfig::is_dumping_method_handles()) {
274 k->set_shared_classpath_index(0);
275 } else {
276 ResourceMark rm;
277 aot_log_info(aot)("Skipping %s because it is dynamically generated", k->name()->as_C_string());
278 return true; // exclude without warning
279 }
280 } else {
281 // These are classes loaded from unsupported locations (such as those loaded by JVMTI native
282 // agent during dump time).
283 return warn_excluded(k, "Unsupported location");
284 }
285 }
286 if (k->signers() != nullptr) {
287 // We cannot include signed classes in the archive because the certificates
288 // used during dump time may be different than those used during
289 // runtime (due to expiration, etc).
290 return warn_excluded(k, "Signed JAR");
291 }
292 if (is_jfr_event_class(k)) {
293 // We cannot include JFR event classes because they need runtime-specific
294 // instrumentation in order to work with -XX:FlightRecorderOptions:retransform=false.
295 // There are only a small number of these classes, so it's not worthwhile to
296 // support them and make CDS more complicated.
297 return warn_excluded(k, "JFR event class");
298 }
299
300 if (!k->is_linked()) {
301 if (has_class_failed_verification(k)) {
302 return warn_excluded(k, "Failed verification");
303 } else if (CDSConfig::is_dumping_aot_linked_classes()) {
304 // Most loaded classes should have been speculatively linked by MetaspaceShared::link_class_for_cds().
305 // However, we do not speculatively link old classes, as they are not recorded by
306 // SystemDictionaryShared::record_linking_constraint(). As a result, such an unlinked
307 // class may fail to verify in AOTLinkedClassBulkLoader::init_required_classes_for_loader(),
308 // causing the JVM to fail at bootstrap.
309 return warn_excluded(k, "Unlinked class not supported by AOTClassLinking");
310 } else if (CDSConfig::is_dumping_preimage_static_archive()) {
311 // When dumping the final static archive, we will unconditionally load and link all
312 // classes from the preimage. We don't want to get a VerifyError when linking this class.
313 return warn_excluded(k, "Unlinked class not supported by AOTConfiguration");
314 }
315 } else {
316 if (!k->can_be_verified_at_dumptime()) {
317 // We have an old class that has been linked (e.g., it's been executed during
318 // dump time). This class has been verified using the old verifier, which
319 // doesn't save the verification constraints, so check_verification_constraints()
320 // won't work at runtime.
321 // As a result, we cannot store this class. It must be loaded and fully verified
322 // at runtime.
323 return warn_excluded(k, "Old class has been linked");
324 }
325 }
326
327 if (UnregisteredClasses::check_for_exclusion(k)) {
328 ResourceMark rm;
329 aot_log_info(aot)("Skipping %s: used only when dumping CDS archive", k->name()->as_C_string());
330 return true;
331 }
332
333 InstanceKlass* super = k->java_super();
334 if (super != nullptr && check_for_exclusion(super, nullptr)) {
335 ResourceMark rm;
336 aot_log_warning(aot)("Skipping %s: super class %s is excluded", k->name()->as_C_string(), super->name()->as_C_string());
337 return true;
338 }
339
340 Array<InstanceKlass*>* interfaces = k->local_interfaces();
341 int len = interfaces->length();
342 for (int i = 0; i < len; i++) {
343 InstanceKlass* intf = interfaces->at(i);
344 if (check_for_exclusion(intf, nullptr)) {
345 ResourceMark rm;
346 aot_log_warning(aot)("Skipping %s: interface %s is excluded", k->name()->as_C_string(), intf->name()->as_C_string());
347 return true;
348 }
349 }
350
351 return false; // false == k should NOT be excluded
352 }
353
354 bool SystemDictionaryShared::is_builtin_loader(ClassLoaderData* loader_data) {
355 oop class_loader = loader_data->class_loader();
356 return (class_loader == nullptr ||
357 SystemDictionary::is_system_class_loader(class_loader) ||
358 SystemDictionary::is_platform_class_loader(class_loader));
359 }
360
361 bool SystemDictionaryShared::has_platform_or_app_classes() {
362 if (FileMapInfo::current_info()->has_platform_or_app_classes()) {
363 return true;
364 }
365 if (DynamicArchive::is_mapped() &&
366 FileMapInfo::dynamic_info()->has_platform_or_app_classes()) {
367 return true;
368 }
369 return false;
370 }
371
372 // The following stack shows how this code is reached:
373 //
374 // [0] SystemDictionaryShared::find_or_load_shared_class()
375 // [1] JVM_FindLoadedClass
376 // [2] java.lang.ClassLoader.findLoadedClass0()
377 // [3] java.lang.ClassLoader.findLoadedClass()
378 // [4] jdk.internal.loader.BuiltinClassLoader.loadClassOrNull()
379 // [5] jdk.internal.loader.BuiltinClassLoader.loadClass()
380 // [6] jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(), or
381 // jdk.internal.loader.ClassLoaders$PlatformClassLoader.loadClass()
382 //
383 // AppCDS supports fast class loading for these 2 built-in class loaders:
384 // jdk.internal.loader.ClassLoaders$PlatformClassLoader
385 // jdk.internal.loader.ClassLoaders$AppClassLoader
386 // with the following assumptions (based on the JDK core library source code):
387 //
388 // [a] these two loaders use the BuiltinClassLoader.loadClassOrNull() to
389 // load the named class.
390 // [b] BuiltinClassLoader.loadClassOrNull() first calls findLoadedClass(name).
391 // [c] At this point, if we can find the named class inside the
392 // shared_dictionary, we can perform further checks (see
393 // SystemDictionary::is_shared_class_visible) to ensure that this class
394 // was loaded by the same class loader during dump time.
395 //
396 // Given these assumptions, we intercept the findLoadedClass() call to invoke
397 // SystemDictionaryShared::find_or_load_shared_class() to load the shared class from
398 // the archive for the 2 built-in class loaders. This way,
399 // we can improve start-up because we avoid decoding the classfile,
400 // and avoid delegating to the parent loader.
401 //
402 // NOTE: there's a lot of assumption about the Java code. If any of that change, this
403 // needs to be redesigned.
404
405 InstanceKlass* SystemDictionaryShared::find_or_load_shared_class(
406 Symbol* name, Handle class_loader, TRAPS) {
407 InstanceKlass* k = nullptr;
408 if (CDSConfig::is_using_archive()) {
409 if (!has_platform_or_app_classes()) {
410 return nullptr;
411 }
412
413 if (SystemDictionary::is_system_class_loader(class_loader()) ||
414 SystemDictionary::is_platform_class_loader(class_loader())) {
415 ClassLoaderData *loader_data = register_loader(class_loader);
416 Dictionary* dictionary = loader_data->dictionary();
417
418 // Note: currently, find_or_load_shared_class is called only from
419 // JVM_FindLoadedClass and used for PlatformClassLoader and AppClassLoader,
420 // which are parallel-capable loaders, so a lock here is NOT taken.
421 assert(get_loader_lock_or_null(class_loader) == nullptr, "ObjectLocker not required");
422 {
423 MutexLocker mu(THREAD, SystemDictionary_lock);
424 InstanceKlass* check = dictionary->find_class(THREAD, name);
425 if (check != nullptr) {
426 return check;
427 }
428 }
429
430 k = load_shared_class_for_builtin_loader(name, class_loader, THREAD);
431 if (k != nullptr) {
432 SharedClassLoadingMark slm(THREAD, k);
433 k = find_or_define_instance_class(name, class_loader, k, CHECK_NULL);
434 }
435 }
436 }
437
438 DEBUG_ONLY(check_klass_after_loading(k);)
439
440 return k;
441 }
442
443 class UnregisteredClassesTable : public ResourceHashtable<
444 Symbol*, InstanceKlass*,
445 15889, // prime number
446 AnyObj::C_HEAP> {};
447
448 static UnregisteredClassesTable* _unregistered_classes_table = nullptr;
449
450 // true == class was successfully added; false == a duplicated class (with the same name) already exists.
451 bool SystemDictionaryShared::add_unregistered_class(Thread* current, InstanceKlass* klass) {
452 // We don't allow duplicated unregistered classes with the same name.
453 // We only archive the first class with that name that succeeds putting
454 // itself into the table.
455 assert(CDSConfig::is_dumping_archive() || ClassListWriter::is_enabled(), "sanity");
456 MutexLocker ml(current, UnregisteredClassesTable_lock, Mutex::_no_safepoint_check_flag);
457 Symbol* name = klass->name();
458 if (_unregistered_classes_table == nullptr) {
459 _unregistered_classes_table = new (mtClass)UnregisteredClassesTable();
460 }
461 bool created;
462 InstanceKlass** v = _unregistered_classes_table->put_if_absent(name, klass, &created);
463 if (created) {
464 name->increment_refcount();
465 }
466 return (klass == *v);
467 }
468
469 InstanceKlass* SystemDictionaryShared::get_unregistered_class(Symbol* name) {
470 assert(CDSConfig::is_dumping_archive() || ClassListWriter::is_enabled(), "sanity");
471 if (_unregistered_classes_table == nullptr) {
472 return nullptr;
473 }
474 InstanceKlass** k = _unregistered_classes_table->get(name);
475 return k != nullptr ? *k : nullptr;
476 }
477
478 void SystemDictionaryShared::copy_unregistered_class_size_and_crc32(InstanceKlass* klass) {
479 precond(CDSConfig::is_dumping_final_static_archive());
480 precond(klass->is_shared());
481
482 // A shared class must have a RunTimeClassInfo record
483 const RunTimeClassInfo* record = find_record(&_static_archive._unregistered_dictionary,
484 nullptr, klass->name());
485 precond(record != nullptr);
486 precond(record->klass() == klass);
487
488 DumpTimeClassInfo* info = get_info(klass);
489 info->_clsfile_size = record->crc()->_clsfile_size;
490 info->_clsfile_crc32 = record->crc()->_clsfile_crc32;
491 }
492
493 void SystemDictionaryShared::set_shared_class_misc_info(InstanceKlass* k, ClassFileStream* cfs) {
494 assert(CDSConfig::is_dumping_archive(), "sanity");
495 assert(!is_builtin(k), "must be unregistered class");
496 DumpTimeClassInfo* info = get_info(k);
497 info->_clsfile_size = cfs->length();
498 info->_clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
499 }
500
501 void SystemDictionaryShared::initialize() {
502 if (CDSConfig::is_dumping_archive()) {
503 _dumptime_table = new (mtClass) DumpTimeSharedClassTable;
504 LambdaProxyClassDictionary::dumptime_init();
505 if (CDSConfig::is_dumping_heap()) {
506 HeapShared::init_dumping();
507 }
508 }
509 }
510
511 void SystemDictionaryShared::init_dumptime_info(InstanceKlass* k) {
512 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
513 assert(SystemDictionaryShared::class_loading_may_happen(), "sanity");
514 DumpTimeClassInfo* info = _dumptime_table->allocate_info(k);
515 if (AOTClassFilter::is_aot_tooling_class(k)) {
516 info->set_is_aot_tooling_class();
517 }
518 }
519
520 void SystemDictionaryShared::remove_dumptime_info(InstanceKlass* k) {
521 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
522 _dumptime_table->remove(k);
523 }
524
525 void SystemDictionaryShared::handle_class_unloading(InstanceKlass* klass) {
526 if (CDSConfig::is_dumping_archive()) {
527 remove_dumptime_info(klass);
528 }
529
530 if (CDSConfig::is_dumping_archive() || ClassListWriter::is_enabled()) {
531 MutexLocker ml(Thread::current(), UnregisteredClassesTable_lock, Mutex::_no_safepoint_check_flag);
532 if (_unregistered_classes_table != nullptr) {
533 // Remove the class from _unregistered_classes_table: keep the entry but
534 // set it to null. This ensure no classes with the same name can be
535 // added again.
536 InstanceKlass** v = _unregistered_classes_table->get(klass->name());
537 if (v != nullptr) {
538 *v = nullptr;
539 }
540 }
541 } else {
542 assert(_unregistered_classes_table == nullptr, "must not be used");
543 }
544
545 if (ClassListWriter::is_enabled()) {
546 ClassListWriter cw;
547 cw.handle_class_unloading((const InstanceKlass*)klass);
548 }
549 }
550
551 void SystemDictionaryShared::init_dumptime_info_from_preimage(InstanceKlass* k) {
552 init_dumptime_info(k);
553 copy_verification_constraints_from_preimage(k);
554 copy_linking_constraints_from_preimage(k);
555
556 if (SystemDictionary::is_platform_class_loader(k->class_loader())) {
557 AOTClassLocationConfig::dumptime_set_has_platform_classes();
558 } else if (SystemDictionary::is_system_class_loader(k->class_loader())) {
559 AOTClassLocationConfig::dumptime_set_has_app_classes();
560 }
561 }
562
563 // Check if a class or any of its supertypes has been redefined.
564 bool SystemDictionaryShared::has_been_redefined(InstanceKlass* k) {
565 if (k->has_been_redefined()) {
566 return true;
567 }
568 if (k->java_super() != nullptr && has_been_redefined(k->java_super())) {
569 return true;
570 }
571 Array<InstanceKlass*>* interfaces = k->local_interfaces();
572 int len = interfaces->length();
573 for (int i = 0; i < len; i++) {
574 if (has_been_redefined(interfaces->at(i))) {
575 return true;
576 }
577 }
578 return false;
579 }
580
581 // k is a class before relocating by ArchiveBuilder
582 void SystemDictionaryShared::validate_before_archiving(InstanceKlass* k) {
583 ResourceMark rm;
584 const char* name = k->name()->as_C_string();
585 DumpTimeClassInfo* info = _dumptime_table->get(k);
586 assert(!class_loading_may_happen(), "class loading must be disabled");
587 guarantee(info != nullptr, "Class %s must be entered into _dumptime_table", name);
588 guarantee(!info->is_excluded(), "Should not attempt to archive excluded class %s", name);
589 if (is_builtin(k)) {
590 if (k->is_hidden()) {
591 if (CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
592 assert(LambdaProxyClassDictionary::is_registered_lambda_proxy_class(k), "unexpected hidden class %s", name);
593 }
594 }
595 guarantee(!k->defined_by_other_loaders(),
596 "Class loader type must be set for BUILTIN class %s", name);
597
598 } else {
599 guarantee(k->defined_by_other_loaders(),
600 "Class loader type must not be set for UNREGISTERED class %s", name);
601 }
602 }
603
604 class UnregisteredClassesDuplicationChecker : StackObj {
605 GrowableArray<InstanceKlass*> _list;
606 Thread* _thread;
607 public:
608 UnregisteredClassesDuplicationChecker() : _thread(Thread::current()) {}
609
610 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
611 if (!SystemDictionaryShared::is_builtin(k)) {
612 _list.append(k);
613 }
614 }
615
616 static int compare_by_loader(InstanceKlass** a, InstanceKlass** b) {
617 ClassLoaderData* loader_a = a[0]->class_loader_data();
618 ClassLoaderData* loader_b = b[0]->class_loader_data();
619
620 if (loader_a != loader_b) {
621 return primitive_compare(loader_a, loader_b);
622 } else {
623 return primitive_compare(a[0], b[0]);
624 }
625 }
626
627 void mark_duplicated_classes() {
628 // Two loaders may load two identical or similar hierarchies of classes. If we
629 // check for duplication in random order, we may end up excluding important base classes
630 // in both hierarchies, causing most of the classes to be excluded.
631 // We sort the classes by their loaders. This way we're likely to archive
632 // all classes in the one of the two hierarchies.
633 _list.sort(compare_by_loader);
634 for (int i = 0; i < _list.length(); i++) {
635 InstanceKlass* k = _list.at(i);
636 bool i_am_first = SystemDictionaryShared::add_unregistered_class(_thread, k);
637 if (!i_am_first) {
638 SystemDictionaryShared::warn_excluded(k, "Duplicated unregistered class");
639 SystemDictionaryShared::set_excluded_locked(k);
640 }
641 }
642 }
643 };
644
645 // Returns true if the class should be excluded. This can be called by
646 // AOTConstantPoolResolver before or after we enter the CDS safepoint.
647 // When called before the safepoint, we need to link the class so that
648 // it can be checked by check_for_exclusion().
649 bool SystemDictionaryShared::should_be_excluded(Klass* k) {
650 assert(CDSConfig::is_dumping_archive(), "sanity");
651 assert(CDSConfig::current_thread_is_vm_or_dumper(), "sanity");
652
653 if (k->is_objArray_klass()) {
654 return should_be_excluded(ObjArrayKlass::cast(k)->bottom_klass());
655 }
656
657 if (!k->is_instance_klass()) {
658 return false;
659 } else {
660 InstanceKlass* ik = InstanceKlass::cast(k);
661
662 if (CDSConfig::is_dumping_dynamic_archive() && ik->is_shared()) {
663 // ik is already part of the static archive, so it will never be considered as excluded.
664 return false;
665 }
666
667 if (!SafepointSynchronize::is_at_safepoint()) {
668 if (!ik->is_linked()) {
669 // check_for_exclusion() below doesn't link unlinked classes. We come
670 // here only when we are trying to aot-link constant pool entries, so
671 // we'd better link the class.
672 JavaThread* THREAD = JavaThread::current();
673 ik->link_class(THREAD);
674 if (HAS_PENDING_EXCEPTION) {
675 CLEAR_PENDING_EXCEPTION;
676 return true; // linking failed -- let's exclude it
677 }
678 }
679
680 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
681 DumpTimeClassInfo* p = get_info_locked(ik);
682 if (p->is_excluded()) {
683 return true;
684 }
685 return check_for_exclusion(ik, p);
686 } else {
687 // No need to check for is_linked() as all eligible classes should have
688 // already been linked in MetaspaceShared::link_class_for_cds().
689 // Can't take the lock as we are in safepoint.
690 DumpTimeClassInfo* p = _dumptime_table->get(ik);
691 if (p->is_excluded()) {
692 return true;
693 }
694 return check_for_exclusion(ik, p);
695 }
696 }
697 }
698
699 void SystemDictionaryShared::finish_exclusion_checks() {
700 if (CDSConfig::is_dumping_dynamic_archive() || CDSConfig::is_dumping_preimage_static_archive()) {
701 // Do this first -- if a base class is excluded due to duplication,
702 // all of its subclasses will also be excluded.
703 ResourceMark rm;
704 UnregisteredClassesDuplicationChecker dup_checker;
705 _dumptime_table->iterate_all_live_classes(&dup_checker);
706 dup_checker.mark_duplicated_classes();
707 }
708
709 _dumptime_table->iterate_all_live_classes([&] (InstanceKlass* k, DumpTimeClassInfo& info) {
710 SystemDictionaryShared::check_for_exclusion(k, &info);
711 });
712
713 _dumptime_table->update_counts();
714 if (CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
715 LambdaProxyClassDictionary::cleanup_dumptime_table();
716 }
717 }
718
719 bool SystemDictionaryShared::is_excluded_class(InstanceKlass* k) {
720 assert(!class_loading_may_happen(), "class loading must be disabled");
721 assert_lock_strong(DumpTimeTable_lock);
722 assert(CDSConfig::is_dumping_archive(), "sanity");
723 DumpTimeClassInfo* p = get_info_locked(k);
724 return p->is_excluded();
725 }
726
727 void SystemDictionaryShared::set_excluded_locked(InstanceKlass* k) {
728 assert_lock_strong(DumpTimeTable_lock);
729 assert(CDSConfig::is_dumping_archive(), "sanity");
730 DumpTimeClassInfo* info = get_info_locked(k);
731 info->set_excluded();
732 }
733
734 void SystemDictionaryShared::set_excluded(InstanceKlass* k) {
735 assert(CDSConfig::is_dumping_archive(), "sanity");
736 DumpTimeClassInfo* info = get_info(k);
737 info->set_excluded();
738 }
739
740 void SystemDictionaryShared::set_class_has_failed_verification(InstanceKlass* ik) {
741 assert(CDSConfig::is_dumping_archive(), "sanity");
742 DumpTimeClassInfo* p = get_info(ik);
743 p->set_failed_verification();
744 }
745
746 bool SystemDictionaryShared::has_class_failed_verification(InstanceKlass* ik) {
747 assert(CDSConfig::is_dumping_archive(), "sanity");
748 DumpTimeClassInfo* p = _dumptime_table->get(ik);
749 return (p == nullptr) ? false : p->failed_verification();
750 }
751
752 void SystemDictionaryShared::set_from_class_file_load_hook(InstanceKlass* ik) {
753 warn_excluded(ik, "From ClassFileLoadHook");
754 set_excluded(ik);
755 }
756
757 void SystemDictionaryShared::dumptime_classes_do(MetaspaceClosure* it) {
758 assert_lock_strong(DumpTimeTable_lock);
759
760 auto do_klass = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
761 if (CDSConfig::is_dumping_final_static_archive() && !k->is_loaded()) {
762 assert(k->defined_by_other_loaders(), "must be");
763 info.metaspace_pointers_do(it);
764 } else if (k->is_loader_alive() && !info.is_excluded()) {
765 info.metaspace_pointers_do(it);
766 }
767 };
768 _dumptime_table->iterate_all_live_classes(do_klass);
769
770 if (CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
771 LambdaProxyClassDictionary::dumptime_classes_do(it);
772 }
773 }
774
775 // Called from VerificationType::is_reference_assignable_from() before performing the assignability check of
776 // T1 must be assignable from T2
777 // Where:
778 // L is the class loader of <k>
779 // T1 is the type resolved by L using the name <name>
780 // T2 is the type resolved by L using the name <from_name>
781 //
782 // The meaning of (*skip_assignability_check):
783 // true: is_reference_assignable_from() should SKIP the assignability check
784 // false: is_reference_assignable_from() should COMPLETE the assignability check
785 void SystemDictionaryShared::add_verification_constraint(InstanceKlass* k, Symbol* name,
786 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object,
787 bool* skip_assignability_check) {
788 assert(CDSConfig::is_dumping_archive(), "sanity");
789 DumpTimeClassInfo* info = get_info(k);
790 info->add_verification_constraint(k, name, from_name, from_field_is_protected,
791 from_is_array, from_is_object);
792
793 if (CDSConfig::is_dumping_classic_static_archive() && !is_builtin(k)) {
794 // This applies ONLY to the "classic" CDS static dump, which reads the list of
795 // unregistered classes (those intended for custom class loaders) from the classlist
796 // and loads them using jdk.internal.misc.CDS$UnregisteredClassLoader.
797 //
798 // When the classlist contains an unregistered class k, the supertypes of k are also
799 // recorded in the classlist. However, the classlist does not contain information about
800 // any class X that's not a supertype of k but is needed in the verification of k.
801 // As a result, CDS$UnregisteredClassLoader will not know how to resolve X.
802 //
803 // Therefore, we tell the verifier to refrain from resolving X. Instead, X is recorded
804 // (symbolically) in the verification constraints of k. In the production run,
805 // when k is loaded, we will go through its verification constraints and resolve X to complete
806 // the is_reference_assignable_from() checks.
807 *skip_assignability_check = true;
808 } else {
809 // In all other cases, we are using an *actual* class loader to load k, so it should be able
810 // to resolve any types that are needed for the verification of k.
811 *skip_assignability_check = false;
812 }
813 }
814
815 void SystemDictionaryShared::add_enum_klass_static_field(InstanceKlass* ik, int root_index) {
816 assert(CDSConfig::is_dumping_heap(), "sanity");
817 DumpTimeClassInfo* info = get_info_locked(ik);
818 info->add_enum_klass_static_field(root_index);
819 }
820
821 void SystemDictionaryShared::check_verification_constraints(InstanceKlass* klass,
822 TRAPS) {
823 assert(CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
824 RunTimeClassInfo* record = RunTimeClassInfo::get_for(klass);
825
826 int length = record->num_verifier_constraints();
827 if (length > 0) {
828 for (int i = 0; i < length; i++) {
829 RunTimeClassInfo::RTVerifierConstraint* vc = record->verifier_constraint_at(i);
830 Symbol* name = vc->name();
831 Symbol* from_name = vc->from_name();
832
833 if (log_is_enabled(Trace, aot, verification)) {
834 ResourceMark rm(THREAD);
835 log_trace(aot, verification)("check_verification_constraint: %s: %s must be subclass of %s [0x%x]",
836 klass->external_name(), from_name->as_klass_external_name(),
837 name->as_klass_external_name(), record->verifier_constraint_flag(i));
838 }
839
840 bool ok = VerificationType::resolve_and_check_assignability(klass, name, from_name,
841 record->from_field_is_protected(i), record->from_is_array(i), record->from_is_object(i), CHECK);
842 if (!ok) {
843 ResourceMark rm(THREAD);
844 stringStream ss;
845
846 ss.print_cr("Bad type on operand stack");
847 ss.print_cr("Exception Details:");
848 ss.print_cr(" Location:\n %s", klass->name()->as_C_string());
849 ss.print_cr(" Reason:\n Type '%s' is not assignable to '%s'",
850 from_name->as_quoted_ascii(), name->as_quoted_ascii());
851 THROW_MSG(vmSymbols::java_lang_VerifyError(), ss.as_string());
852 }
853 }
854 }
855 }
856
857 void SystemDictionaryShared::copy_verification_constraints_from_preimage(InstanceKlass* klass) {
858 assert(CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
859 DumpTimeClassInfo* dt_info = get_info(klass);
860 RunTimeClassInfo* rt_info = RunTimeClassInfo::get_for(klass); // from preimage
861
862 int length = rt_info->num_verifier_constraints();
863 if (length > 0) {
864 for (int i = 0; i < length; i++) {
865 RunTimeClassInfo::RTVerifierConstraint* vc = rt_info->verifier_constraint_at(i);
866 Symbol* name = vc->name();
867 Symbol* from_name = vc->from_name();
868
869 dt_info->add_verification_constraint(klass, name, from_name,
870 rt_info->from_field_is_protected(i), rt_info->from_is_array(i), rt_info->from_is_object(i));
871 }
872 }
873 }
874
875 static oop get_class_loader_by(char type) {
876 if (type == (char)ClassLoader::BOOT_LOADER) {
877 return (oop)nullptr;
878 } else if (type == (char)ClassLoader::PLATFORM_LOADER) {
879 return SystemDictionary::java_platform_loader();
880 } else {
881 assert (type == (char)ClassLoader::APP_LOADER, "Sanity");
882 return SystemDictionary::java_system_loader();
883 }
884 }
885
886 // Record class loader constraints that are checked inside
887 // InstanceKlass::link_class(), so that these can be checked quickly
888 // at runtime without laying out the vtable/itables.
889 void SystemDictionaryShared::record_linking_constraint(Symbol* name, InstanceKlass* klass,
890 Handle loader1, Handle loader2) {
891 // A linking constraint check is executed when:
892 // - klass extends or implements type S
893 // - klass overrides method S.M(...) with X.M
894 // - If klass defines the method M, X is
895 // the same as klass.
896 // - If klass does not define the method M,
897 // X must be a supertype of klass and X.M is
898 // a default method defined by X.
899 // - loader1 = X->class_loader()
900 // - loader2 = S->class_loader()
901 // - loader1 != loader2
902 // - M's parameter(s) include an object type T
903 // We require that
904 // - whenever loader1 and loader2 try to
905 // resolve the type T, they must always resolve to
906 // the same InstanceKlass.
907 // NOTE: type T may or may not be currently resolved in
908 // either of these two loaders. The check itself does not
909 // try to resolve T.
910 oop klass_loader = klass->class_loader();
911
912 if (!is_system_class_loader(klass_loader) &&
913 !is_platform_class_loader(klass_loader)) {
914 // If klass is loaded by system/platform loaders, we can
915 // guarantee that klass and S must be loaded by the same
916 // respective loader between dump time and run time, and
917 // the exact same check on (name, loader1, loader2) will
918 // be executed. Hence, we can cache this check and execute
919 // it at runtime without walking the vtable/itables.
920 //
921 // This cannot be guaranteed for classes loaded by other
922 // loaders, so we bail.
923 return;
924 }
925
926 assert(is_builtin(klass), "must be");
927 assert(klass_loader != nullptr, "should not be called for boot loader");
928 assert(loader1 != loader2, "must be");
929
930 if (CDSConfig::is_dumping_dynamic_archive() && Thread::current()->is_VM_thread()) {
931 // We are re-laying out the vtable/itables of the *copy* of
932 // a class during the final stage of dynamic dumping. The
933 // linking constraints for this class has already been recorded.
934 return;
935 }
936 assert(!Thread::current()->is_VM_thread(), "must be");
937
938 assert(CDSConfig::is_dumping_archive(), "sanity");
939 DumpTimeClassInfo* info = get_info(klass);
940 info->record_linking_constraint(name, loader1, loader2);
941 }
942
943 // returns true IFF there's no need to re-initialize the i/v-tables for klass for
944 // the purpose of checking class loader constraints.
945 bool SystemDictionaryShared::check_linking_constraints(Thread* current, InstanceKlass* klass) {
946 assert(CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
947 LogTarget(Info, class, loader, constraints) log;
948 if (klass->defined_by_boot_loader()) {
949 // No class loader constraint check performed for boot classes.
950 return true;
951 }
952 if (klass->defined_by_platform_loader() || klass->defined_by_app_loader()) {
953 RunTimeClassInfo* info = RunTimeClassInfo::get_for(klass);
954 assert(info != nullptr, "Sanity");
955 if (info->num_loader_constraints() > 0) {
956 HandleMark hm(current);
957 for (int i = 0; i < info->num_loader_constraints(); i++) {
958 RunTimeClassInfo::RTLoaderConstraint* lc = info->loader_constraint_at(i);
959 Symbol* name = lc->constraint_name();
960 Handle loader1(current, get_class_loader_by(lc->_loader_type1));
961 Handle loader2(current, get_class_loader_by(lc->_loader_type2));
962 if (log.is_enabled()) {
963 ResourceMark rm(current);
964 log.print("[CDS add loader constraint for class %s symbol %s loader[0] %s loader[1] %s",
965 klass->external_name(), name->as_C_string(),
966 ClassLoaderData::class_loader_data(loader1())->loader_name_and_id(),
967 ClassLoaderData::class_loader_data(loader2())->loader_name_and_id());
968 }
969 if (!SystemDictionary::add_loader_constraint(name, klass, loader1, loader2)) {
970 // Loader constraint violation has been found. The caller
971 // will re-layout the vtable/itables to produce the correct
972 // exception.
973 if (log.is_enabled()) {
974 log.print(" failed]");
975 }
976 return false;
977 }
978 if (log.is_enabled()) {
979 log.print(" succeeded]");
980 }
981 }
982 return true; // for all recorded constraints added successfully.
983 }
984 }
985 if (log.is_enabled()) {
986 ResourceMark rm(current);
987 log.print("[CDS has not recorded loader constraint for class %s]", klass->external_name());
988 }
989 return false;
990 }
991
992 void SystemDictionaryShared::copy_linking_constraints_from_preimage(InstanceKlass* klass) {
993 assert(CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
994 JavaThread* current = JavaThread::current();
995 if (klass->defined_by_platform_loader() || klass->defined_by_app_loader()) {
996 RunTimeClassInfo* rt_info = RunTimeClassInfo::get_for(klass); // from preimage
997
998 if (rt_info->num_loader_constraints() > 0) {
999 for (int i = 0; i < rt_info->num_loader_constraints(); i++) {
1000 RunTimeClassInfo::RTLoaderConstraint* lc = rt_info->loader_constraint_at(i);
1001 Symbol* name = lc->constraint_name();
1002 Handle loader1(current, get_class_loader_by(lc->_loader_type1));
1003 Handle loader2(current, get_class_loader_by(lc->_loader_type2));
1004 record_linking_constraint(name, klass, loader1, loader2);
1005 }
1006 }
1007 }
1008 }
1009
1010 unsigned int SystemDictionaryShared::hash_for_shared_dictionary(address ptr) {
1011 if (ArchiveBuilder::is_active() && ArchiveBuilder::current()->is_in_buffer_space(ptr)) {
1012 uintx offset = ArchiveBuilder::current()->any_to_offset(ptr);
1013 unsigned int hash = primitive_hash<uintx>(offset);
1014 DEBUG_ONLY({
1015 if (MetaspaceObj::is_shared((const MetaspaceObj*)ptr)) {
1016 assert(hash == SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr), "must be");
1017 }
1018 });
1019 return hash;
1020 } else {
1021 return SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr);
1022 }
1023 }
1024
1025 class CopySharedClassInfoToArchive : StackObj {
1026 CompactHashtableWriter* _writer;
1027 bool _is_builtin;
1028 ArchiveBuilder *_builder;
1029 public:
1030 CopySharedClassInfoToArchive(CompactHashtableWriter* writer,
1031 bool is_builtin)
1032 : _writer(writer), _is_builtin(is_builtin), _builder(ArchiveBuilder::current()) {}
1033
1034 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
1035 if (!info.is_excluded() && info.is_builtin() == _is_builtin) {
1036 size_t byte_size = info.runtime_info_bytesize();
1037 RunTimeClassInfo* record;
1038 record = (RunTimeClassInfo*)ArchiveBuilder::ro_region_alloc(byte_size);
1039 record->init(info);
1040
1041 unsigned int hash;
1042 Symbol* name = info._klass->name();
1043 name = ArchiveBuilder::current()->get_buffered_addr(name);
1044 hash = SystemDictionaryShared::hash_for_shared_dictionary((address)name);
1045 u4 delta = _builder->buffer_to_offset_u4((address)record);
1046 if (_is_builtin && info._klass->is_hidden()) {
1047 // skip
1048 } else {
1049 _writer->add(hash, delta);
1050 }
1051 if (log_is_enabled(Trace, aot, hashtables)) {
1052 ResourceMark rm;
1053 log_trace(aot, hashtables)("%s dictionary: %s", (_is_builtin ? "builtin" : "unregistered"), info._klass->external_name());
1054 }
1055
1056 // Save this for quick runtime lookup of InstanceKlass* -> RunTimeClassInfo*
1057 InstanceKlass* buffered_klass = ArchiveBuilder::current()->get_buffered_addr(info._klass);
1058 RunTimeClassInfo::set_for(buffered_klass, record);
1059 }
1060 }
1061 };
1062
1063 void SystemDictionaryShared::write_dictionary(RunTimeSharedDictionary* dictionary,
1064 bool is_builtin) {
1065 CompactHashtableStats stats;
1066 dictionary->reset();
1067 CompactHashtableWriter writer(_dumptime_table->count_of(is_builtin), &stats);
1068 CopySharedClassInfoToArchive copy(&writer, is_builtin);
1069 assert_lock_strong(DumpTimeTable_lock);
1070 _dumptime_table->iterate_all_live_classes(©);
1071 writer.dump(dictionary, is_builtin ? "builtin dictionary" : "unregistered dictionary");
1072 }
1073
1074 void SystemDictionaryShared::write_to_archive(bool is_static_archive) {
1075 ArchiveInfo* archive = get_archive(is_static_archive);
1076
1077 write_dictionary(&archive->_builtin_dictionary, true);
1078 write_dictionary(&archive->_unregistered_dictionary, false);
1079 if (CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
1080 LambdaProxyClassDictionary::write_dictionary(is_static_archive);
1081 } else {
1082 LambdaProxyClassDictionary::reset_dictionary(is_static_archive);
1083 }
1084 }
1085
1086 void SystemDictionaryShared::serialize_dictionary_headers(SerializeClosure* soc,
1087 bool is_static_archive) {
1088 ArchiveInfo* archive = get_archive(is_static_archive);
1089
1090 archive->_builtin_dictionary.serialize_header(soc);
1091 archive->_unregistered_dictionary.serialize_header(soc);
1092 LambdaProxyClassDictionary::serialize(soc, is_static_archive);
1093 }
1094
1095 void SystemDictionaryShared::serialize_vm_classes(SerializeClosure* soc) {
1096 for (auto id : EnumRange<vmClassID>{}) {
1097 soc->do_ptr(vmClasses::klass_addr_at(id));
1098 }
1099 }
1100
1101 const RunTimeClassInfo*
1102 SystemDictionaryShared::find_record(RunTimeSharedDictionary* static_dict, RunTimeSharedDictionary* dynamic_dict, Symbol* name) {
1103 if (!CDSConfig::is_using_archive() || !name->is_shared()) {
1104 // The names of all shared classes must also be a shared Symbol.
1105 return nullptr;
1106 }
1107
1108 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(name);
1109 const RunTimeClassInfo* record = nullptr;
1110 if (DynamicArchive::is_mapped()) {
1111 // Use the regenerated holder classes in the dynamic archive as they
1112 // have more methods than those in the base archive.
1113 if (LambdaFormInvokers::may_be_regenerated_class(name)) {
1114 record = dynamic_dict->lookup(name, hash, 0);
1115 if (record != nullptr) {
1116 return record;
1117 }
1118 }
1119 }
1120
1121 if (!MetaspaceShared::is_shared_dynamic(name)) {
1122 // The names of all shared classes in the static dict must also be in the
1123 // static archive
1124 record = static_dict->lookup(name, hash, 0);
1125 }
1126
1127 if (record == nullptr && DynamicArchive::is_mapped()) {
1128 record = dynamic_dict->lookup(name, hash, 0);
1129 }
1130
1131 return record;
1132 }
1133
1134 InstanceKlass* SystemDictionaryShared::find_builtin_class(Symbol* name) {
1135 const RunTimeClassInfo* record = find_record(&_static_archive._builtin_dictionary,
1136 &_dynamic_archive._builtin_dictionary,
1137 name);
1138 if (record != nullptr) {
1139 assert(!record->klass()->is_hidden(), "hidden class cannot be looked up by name");
1140 DEBUG_ONLY(check_klass_after_loading(record->klass());)
1141 // We did not save the classfile data of the generated LambdaForm invoker classes,
1142 // so we cannot support CLFH for such classes.
1143 if (record->klass()->is_generated_shared_class() && JvmtiExport::should_post_class_file_load_hook()) {
1144 return nullptr;
1145 }
1146 return record->klass();
1147 } else {
1148 return nullptr;
1149 }
1150 }
1151
1152 void SystemDictionaryShared::update_shared_entry(InstanceKlass* k, int id) {
1153 assert(CDSConfig::is_dumping_static_archive(), "class ID is used only for static dump (from classlist)");
1154 DumpTimeClassInfo* info = get_info(k);
1155 info->_id = id;
1156 }
1157
1158 const char* SystemDictionaryShared::loader_type_for_shared_class(Klass* k) {
1159 assert(k != nullptr, "Sanity");
1160 assert(k->is_shared(), "Must be");
1161 assert(k->is_instance_klass(), "Must be");
1162 InstanceKlass* ik = InstanceKlass::cast(k);
1163 if (ik->defined_by_boot_loader()) {
1164 return "boot_loader";
1165 } else if (ik->defined_by_platform_loader()) {
1166 return "platform_loader";
1167 } else if (ik->defined_by_app_loader()) {
1168 return "app_loader";
1169 } else if (ik->defined_by_other_loaders()) {
1170 return "unregistered_loader";
1171 } else {
1172 return "unknown loader";
1173 }
1174 }
1175
1176 class SharedDictionaryPrinter : StackObj {
1177 outputStream* _st;
1178 int _index;
1179 public:
1180 SharedDictionaryPrinter(outputStream* st) : _st(st), _index(0) {}
1181
1182 void do_value(const RunTimeClassInfo* record) {
1183 ResourceMark rm;
1184 _st->print_cr("%4d: %s %s", _index++, record->klass()->external_name(),
1185 SystemDictionaryShared::loader_type_for_shared_class(record->klass()));
1186 if (record->klass()->array_klasses() != nullptr) {
1187 record->klass()->array_klasses()->cds_print_value_on(_st);
1188 _st->cr();
1189 }
1190 }
1191 int index() const { return _index; }
1192 };
1193
1194 void SystemDictionaryShared::ArchiveInfo::print_on(const char* prefix,
1195 outputStream* st,
1196 bool is_static_archive) {
1197 st->print_cr("%sShared Dictionary", prefix);
1198 SharedDictionaryPrinter p(st);
1199 st->print_cr("%sShared Builtin Dictionary", prefix);
1200 _builtin_dictionary.iterate(&p);
1201 st->print_cr("%sShared Unregistered Dictionary", prefix);
1202 _unregistered_dictionary.iterate(&p);
1203 LambdaProxyClassDictionary::print_on(prefix, st, p.index(), is_static_archive);
1204 }
1205
1206 void SystemDictionaryShared::ArchiveInfo::print_table_statistics(const char* prefix,
1207 outputStream* st,
1208 bool is_static_archive) {
1209 st->print_cr("%sArchve Statistics", prefix);
1210 _builtin_dictionary.print_table_statistics(st, "Builtin Shared Dictionary");
1211 _unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary");
1212 LambdaProxyClassDictionary::print_statistics(st, is_static_archive);
1213 }
1214
1215 void SystemDictionaryShared::print_shared_archive(outputStream* st, bool is_static) {
1216 if (CDSConfig::is_using_archive()) {
1217 if (is_static) {
1218 _static_archive.print_on("", st, true);
1219 } else {
1220 if (DynamicArchive::is_mapped()) {
1221 _dynamic_archive.print_on("Dynamic ", st, false);
1222 }
1223 }
1224 }
1225 }
1226
1227 void SystemDictionaryShared::print_on(outputStream* st) {
1228 print_shared_archive(st, true);
1229 print_shared_archive(st, false);
1230 }
1231
1232 void SystemDictionaryShared::print_table_statistics(outputStream* st) {
1233 if (CDSConfig::is_using_archive()) {
1234 _static_archive.print_table_statistics("Static ", st, true);
1235 if (DynamicArchive::is_mapped()) {
1236 _dynamic_archive.print_table_statistics("Dynamic ", st, false);
1237 }
1238 }
1239 }
1240
1241 bool SystemDictionaryShared::is_dumptime_table_empty() {
1242 assert_lock_strong(DumpTimeTable_lock);
1243 _dumptime_table->update_counts();
1244 if (_dumptime_table->count_of(true) == 0 && _dumptime_table->count_of(false) == 0){
1245 return true;
1246 }
1247 return false;
1248 }