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/lambdaFormInvokers.inline.hpp"
39 #include "cds/lambdaProxyClassDictionary.hpp"
40 #include "cds/lambdaFormInvokers.inline.hpp"
41 #include "cds/metaspaceShared.hpp"
42 #include "cds/runTimeClassInfo.hpp"
43 #include "cds/unregisteredClasses.hpp"
44 #include "classfile/classFileStream.hpp"
45 #include "classfile/classLoader.hpp"
46 #include "classfile/classLoaderData.inline.hpp"
47 #include "classfile/classLoaderDataGraph.hpp"
48 #include "classfile/classLoaderExt.hpp"
49 #include "classfile/dictionary.hpp"
50 #include "classfile/javaClasses.hpp"
51 #include "classfile/javaClasses.inline.hpp"
52 #include "classfile/symbolTable.hpp"
53 #include "classfile/systemDictionary.hpp"
54 #include "classfile/systemDictionaryShared.hpp"
55 #include "classfile/verificationType.hpp"
56 #include "classfile/vmClasses.hpp"
57 #include "classfile/vmSymbols.hpp"
58 #include "jfr/jfrEvents.hpp"
59 #include "logging/log.hpp"
60 #include "logging/logStream.hpp"
61 #include "memory/allocation.hpp"
62 #include "memory/metadataFactory.hpp"
63 #include "memory/metaspaceClosure.hpp"
64 #include "memory/oopFactory.hpp"
65 #include "memory/resourceArea.hpp"
66 #include "memory/universe.hpp"
67 #include "oops/compressedKlass.inline.hpp"
68 #include "oops/instanceKlass.hpp"
69 #include "oops/klass.inline.hpp"
70 #include "oops/methodData.hpp"
71 #include "oops/objArrayKlass.hpp"
72 #include "oops/objArrayOop.inline.hpp"
73 #include "oops/oop.inline.hpp"
74 #include "oops/oopHandle.inline.hpp"
75 #include "oops/typeArrayOop.inline.hpp"
76 #include "runtime/arguments.hpp"
77 #include "runtime/handles.inline.hpp"
78 #include "runtime/java.hpp"
79 #include "runtime/javaCalls.hpp"
80 #include "runtime/mutexLocker.hpp"
81 #include "utilities/resourceHash.hpp"
82 #include "utilities/stringUtils.hpp"
83
84 SystemDictionaryShared::ArchiveInfo SystemDictionaryShared::_static_archive;
85 SystemDictionaryShared::ArchiveInfo SystemDictionaryShared::_dynamic_archive;
86
87 DumpTimeSharedClassTable* SystemDictionaryShared::_dumptime_table = nullptr;
88
89 // Used by NoClassLoadingMark
90 DEBUG_ONLY(bool SystemDictionaryShared::_class_loading_may_happen = true;)
91
92 #ifdef ASSERT
93 static void check_klass_after_loading(const Klass* k) {
94 #ifdef _LP64
95 if (k != nullptr && UseCompressedClassPointers && k->needs_narrow_id()) {
96 CompressedKlassPointers::check_encodable(k);
97 }
98 #endif
99 }
100 #endif
101
102 InstanceKlass* SystemDictionaryShared::load_shared_class_for_builtin_loader(
103 Symbol* class_name, Handle class_loader, TRAPS) {
104 assert(CDSConfig::is_using_archive(), "must be");
105 InstanceKlass* ik = find_builtin_class(class_name);
106
107 if (ik != nullptr && !ik->shared_loading_failed()) {
108 if ((SystemDictionary::is_system_class_loader(class_loader()) && ik->defined_by_app_loader()) ||
109 (SystemDictionary::is_platform_class_loader(class_loader()) && ik->defined_by_platform_loader())) {
110 SharedClassLoadingMark slm(THREAD, ik);
111 PackageEntry* pkg_entry = CDSProtectionDomain::get_package_entry_from_class(ik, class_loader);
112 Handle protection_domain;
113 if (!class_name->starts_with("jdk/proxy")) // java/lang/reflect/Proxy$ProxyBuilder defines the proxy classes with a null protection domain.
114 {
115 protection_domain = CDSProtectionDomain::init_security_info(class_loader, ik, pkg_entry, CHECK_NULL);
116 }
117 return load_shared_class(ik, class_loader, protection_domain, nullptr, pkg_entry, THREAD);
118 }
119 }
120 return nullptr;
121 }
122
123 // This function is called for loading only UNREGISTERED classes
124 InstanceKlass* SystemDictionaryShared::lookup_from_stream(Symbol* class_name,
125 Handle class_loader,
126 Handle protection_domain,
127 const ClassFileStream* cfs,
128 TRAPS) {
129 if (!CDSConfig::is_using_archive()) {
130 return nullptr;
131 }
132 if (class_name == nullptr) { // don't do this for hidden classes
133 return nullptr;
134 }
135 if (class_loader.is_null() ||
136 SystemDictionary::is_system_class_loader(class_loader()) ||
137 SystemDictionary::is_platform_class_loader(class_loader())) {
138 // Do nothing for the BUILTIN loaders.
139 return nullptr;
140 }
141
142 const RunTimeClassInfo* record = find_record(&_static_archive._unregistered_dictionary,
143 &_dynamic_archive._unregistered_dictionary,
144 class_name);
145 if (record == nullptr) {
146 return nullptr;
147 }
148
149 int clsfile_size = cfs->length();
150 int clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
151
152 if (!record->matches(clsfile_size, clsfile_crc32)) {
153 return nullptr;
154 }
155
156 return acquire_class_for_current_thread(record->klass(), class_loader,
157 protection_domain, cfs,
158 THREAD);
159 }
160
161 InstanceKlass* SystemDictionaryShared::acquire_class_for_current_thread(
162 InstanceKlass *ik,
163 Handle class_loader,
164 Handle protection_domain,
165 const ClassFileStream *cfs,
166 TRAPS) {
167 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader());
168
169 {
170 MutexLocker mu(THREAD, SharedDictionary_lock);
171 if (ik->class_loader_data() != nullptr) {
172 // ik is already loaded (by this loader or by a different loader)
173 // or ik is being loaded by a different thread (by this loader or by a different loader)
174 return nullptr;
175 }
176
177 // No other thread has acquired this yet, so give it to *this thread*
178 ik->set_class_loader_data(loader_data);
179 }
180
181 // No longer holding SharedDictionary_lock
182 // No need to lock, as <ik> can be held only by a single thread.
183 loader_data->add_class(ik);
184
185 // Get the package entry.
186 PackageEntry* pkg_entry = CDSProtectionDomain::get_package_entry_from_class(ik, class_loader);
187
188 // Load and check super/interfaces, restore unshareable info
189 InstanceKlass* shared_klass = load_shared_class(ik, class_loader, protection_domain,
190 cfs, pkg_entry, THREAD);
191 if (shared_klass == nullptr || HAS_PENDING_EXCEPTION) {
192 // TODO: clean up <ik> so it can be used again
193 return nullptr;
194 }
195
196 return shared_klass;
197 }
198
199 // Guaranteed to return non-null value for non-shared classes.
200 // k must not be a shared class.
201 DumpTimeClassInfo* SystemDictionaryShared::get_info(InstanceKlass* k) {
202 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
203 return get_info_locked(k);
204 }
205
206 DumpTimeClassInfo* SystemDictionaryShared::get_info_locked(InstanceKlass* k) {
207 assert_lock_strong(DumpTimeTable_lock);
208 DumpTimeClassInfo* info = _dumptime_table->get_info(k);
209 assert(info != nullptr, "must be");
210 return info;
211 }
212
213 bool SystemDictionaryShared::check_for_exclusion(InstanceKlass* k, DumpTimeClassInfo* info) {
214 if (CDSConfig::is_dumping_dynamic_archive() && MetaspaceShared::is_in_shared_metaspace(k)) {
215 // We have reached a super type that's already in the base archive. Treat it
216 // as "not excluded".
217 return false;
218 }
219
220 if (info == nullptr) {
221 info = _dumptime_table->get(k);
222 assert(info != nullptr, "supertypes of any classes in _dumptime_table must either be shared, or must also be in _dumptime_table");
223 }
224
225 if (!info->has_checked_exclusion()) {
226 if (check_for_exclusion_impl(k)) {
227 info->set_excluded();
228 }
229 info->set_has_checked_exclusion();
230 }
231
232 return info->is_excluded();
233 }
234
235 // Returns true so the caller can do: return warn_excluded(".....");
236 bool SystemDictionaryShared::warn_excluded(InstanceKlass* k, const char* reason) {
237 ResourceMark rm;
238 aot_log_warning(aot)("Skipping %s: %s", k->name()->as_C_string(), reason);
239 return true;
240 }
241
242 bool SystemDictionaryShared::is_jfr_event_class(InstanceKlass *k) {
243 while (k) {
244 if (k->name()->equals("jdk/internal/event/Event")) {
245 return true;
246 }
247 k = k->java_super();
248 }
249 return false;
250 }
251
252 bool SystemDictionaryShared::is_early_klass(InstanceKlass* ik) {
253 DumpTimeClassInfo* info = _dumptime_table->get(ik);
254 return (info != nullptr) ? info->is_early_klass() : false;
255 }
256
257 bool SystemDictionaryShared::check_for_exclusion_impl(InstanceKlass* k) {
258 if (CDSConfig::is_dumping_final_static_archive() && k->defined_by_other_loaders()
259 && k->is_shared()) {
260 return false; // Do not exclude: unregistered classes are passed from preimage to final image.
261 }
262
263 if (k->is_in_error_state()) {
264 return warn_excluded(k, "In error state");
265 }
266 if (k->is_scratch_class()) {
267 return warn_excluded(k, "A scratch class");
268 }
269 if (!k->is_loaded()) {
270 return warn_excluded(k, "Not in loaded state");
271 }
272 if (has_been_redefined(k)) {
273 return warn_excluded(k, "Has been redefined");
274 }
275 if (!k->is_hidden() && k->shared_classpath_index() < 0 && is_builtin(k)) {
276 if (k->name()->starts_with("java/lang/invoke/BoundMethodHandle$Species_")) {
277 // This class is dynamically generated by the JDK
278 if (CDSConfig::is_dumping_method_handles()) {
279 k->set_shared_classpath_index(0);
280 } else {
281 ResourceMark rm;
282 aot_log_info(aot)("Skipping %s because it is dynamically generated", k->name()->as_C_string());
283 return true; // exclude without warning
284 }
285 } else {
286 // These are classes loaded from unsupported locations (such as those loaded by JVMTI native
287 // agent during dump time).
288 return warn_excluded(k, "Unsupported location");
289 }
290 }
291 if (k->signers() != nullptr) {
292 // We cannot include signed classes in the archive because the certificates
293 // used during dump time may be different than those used during
294 // runtime (due to expiration, etc).
295 return warn_excluded(k, "Signed JAR");
296 }
297 if (is_jfr_event_class(k)) {
298 // We cannot include JFR event classes because they need runtime-specific
299 // instrumentation in order to work with -XX:FlightRecorderOptions:retransform=false.
300 // There are only a small number of these classes, so it's not worthwhile to
301 // support them and make CDS more complicated.
302 if (!CDSConfig::is_dumping_reflection_data()) { // FIXME: !!! HACK !!!
303 return warn_excluded(k, "JFR event class");
304 }
305 }
306
307 if (!k->is_linked()) {
308 if (has_class_failed_verification(k)) {
309 return warn_excluded(k, "Failed verification");
310 } else if (CDSConfig::is_dumping_aot_linked_classes()) {
311 // Most loaded classes should have been speculatively linked by MetaspaceShared::link_class_for_cds().
312 // However, we do not speculatively link old classes, as they are not recorded by
313 // SystemDictionaryShared::record_linking_constraint(). As a result, such an unlinked
314 // class may fail to verify in AOTLinkedClassBulkLoader::init_required_classes_for_loader(),
315 // causing the JVM to fail at bootstrap.
316 return warn_excluded(k, "Unlinked class not supported by AOTClassLinking");
317 } else if (CDSConfig::is_dumping_preimage_static_archive()) {
318 // When dumping the final static archive, we will unconditionally load and link all
319 // classes from the preimage. We don't want to get a VerifyError when linking this class.
320 return warn_excluded(k, "Unlinked class not supported by AOTConfiguration");
321 }
322 } else {
323 if (!k->can_be_verified_at_dumptime() && !CDSConfig::preserve_all_dumptime_verification_states(k)) {
324 // We have an old class that has been linked (e.g., it's been executed during
325 // dump time). This class has been verified using the old verifier, which
326 // doesn't save the verification constraints, so check_verification_constraints()
327 // won't work at runtime.
328 // As a result, we cannot store this class. It must be loaded and fully verified
329 // at runtime.
330 return warn_excluded(k, "Old class has been linked");
331 }
332 }
333
334 if (UnregisteredClasses::check_for_exclusion(k)) {
335 ResourceMark rm;
336 aot_log_info(aot)("Skipping %s: used only when dumping CDS archive", k->name()->as_C_string());
337 return true;
338 }
339
340 InstanceKlass* super = k->java_super();
341 if (super != nullptr && check_for_exclusion(super, nullptr)) {
342 ResourceMark rm;
343 aot_log_warning(aot)("Skipping %s: super class %s is excluded", k->name()->as_C_string(), super->name()->as_C_string());
344 return true;
345 }
346
347 Array<InstanceKlass*>* interfaces = k->local_interfaces();
348 int len = interfaces->length();
349 for (int i = 0; i < len; i++) {
350 InstanceKlass* intf = interfaces->at(i);
351 if (check_for_exclusion(intf, nullptr)) {
352 ResourceMark rm;
353 aot_log_warning(aot)("Skipping %s: interface %s is excluded", k->name()->as_C_string(), intf->name()->as_C_string());
354 return true;
355 }
356 }
357
358 return false; // false == k should NOT be excluded
359 }
360
361 bool SystemDictionaryShared::is_builtin_loader(ClassLoaderData* loader_data) {
362 oop class_loader = loader_data->class_loader();
363 return (class_loader == nullptr ||
364 SystemDictionary::is_system_class_loader(class_loader) ||
365 SystemDictionary::is_platform_class_loader(class_loader));
366 }
367
368 bool SystemDictionaryShared::has_platform_or_app_classes() {
369 if (FileMapInfo::current_info()->has_platform_or_app_classes()) {
370 return true;
371 }
372 if (DynamicArchive::is_mapped() &&
373 FileMapInfo::dynamic_info()->has_platform_or_app_classes()) {
374 return true;
375 }
376 return false;
377 }
378
379 // The following stack shows how this code is reached:
380 //
381 // [0] SystemDictionaryShared::find_or_load_shared_class()
382 // [1] JVM_FindLoadedClass
383 // [2] java.lang.ClassLoader.findLoadedClass0()
384 // [3] java.lang.ClassLoader.findLoadedClass()
385 // [4] jdk.internal.loader.BuiltinClassLoader.loadClassOrNull()
386 // [5] jdk.internal.loader.BuiltinClassLoader.loadClass()
387 // [6] jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(), or
388 // jdk.internal.loader.ClassLoaders$PlatformClassLoader.loadClass()
389 //
390 // AppCDS supports fast class loading for these 2 built-in class loaders:
391 // jdk.internal.loader.ClassLoaders$PlatformClassLoader
392 // jdk.internal.loader.ClassLoaders$AppClassLoader
393 // with the following assumptions (based on the JDK core library source code):
394 //
395 // [a] these two loaders use the BuiltinClassLoader.loadClassOrNull() to
396 // load the named class.
397 // [b] BuiltinClassLoader.loadClassOrNull() first calls findLoadedClass(name).
398 // [c] At this point, if we can find the named class inside the
399 // shared_dictionary, we can perform further checks (see
400 // SystemDictionary::is_shared_class_visible) to ensure that this class
401 // was loaded by the same class loader during dump time.
402 //
403 // Given these assumptions, we intercept the findLoadedClass() call to invoke
404 // SystemDictionaryShared::find_or_load_shared_class() to load the shared class from
405 // the archive for the 2 built-in class loaders. This way,
406 // we can improve start-up because we avoid decoding the classfile,
407 // and avoid delegating to the parent loader.
408 //
409 // NOTE: there's a lot of assumption about the Java code. If any of that change, this
410 // needs to be redesigned.
411
412 InstanceKlass* SystemDictionaryShared::find_or_load_shared_class(
413 Symbol* name, Handle class_loader, TRAPS) {
414 InstanceKlass* k = nullptr;
415 if (CDSConfig::is_using_archive()) {
416 if (!has_platform_or_app_classes()) {
417 return nullptr;
418 }
419
420 if (SystemDictionary::is_system_class_loader(class_loader()) ||
421 SystemDictionary::is_platform_class_loader(class_loader())) {
422 ClassLoaderData *loader_data = register_loader(class_loader);
423 Dictionary* dictionary = loader_data->dictionary();
424
425 // Note: currently, find_or_load_shared_class is called only from
426 // JVM_FindLoadedClass and used for PlatformClassLoader and AppClassLoader,
427 // which are parallel-capable loaders, so a lock here is NOT taken.
428 assert(get_loader_lock_or_null(class_loader) == nullptr, "ObjectLocker not required");
429 {
430 MutexLocker mu(THREAD, SystemDictionary_lock);
431 InstanceKlass* check = dictionary->find_class(THREAD, name);
432 if (check != nullptr) {
433 return check;
434 }
435 }
436
437 k = load_shared_class_for_builtin_loader(name, class_loader, THREAD);
438 if (k != nullptr) {
439 SharedClassLoadingMark slm(THREAD, k);
440 k = find_or_define_instance_class(name, class_loader, k, CHECK_NULL);
441 }
442 }
443 }
444
445 DEBUG_ONLY(check_klass_after_loading(k);)
446
447 return k;
448 }
449
450 class UnregisteredClassesTable : public ResourceHashtable<
451 Symbol*, InstanceKlass*,
452 15889, // prime number
453 AnyObj::C_HEAP> {};
454
455 static UnregisteredClassesTable* _unregistered_classes_table = nullptr;
456
457 // true == class was successfully added; false == a duplicated class (with the same name) already exists.
458 bool SystemDictionaryShared::add_unregistered_class(Thread* current, InstanceKlass* klass) {
459 // We don't allow duplicated unregistered classes with the same name.
460 // We only archive the first class with that name that succeeds putting
461 // itself into the table.
462 assert(CDSConfig::is_dumping_archive() || ClassListWriter::is_enabled(), "sanity");
463 MutexLocker ml(current, UnregisteredClassesTable_lock, Mutex::_no_safepoint_check_flag);
464 Symbol* name = klass->name();
465 if (_unregistered_classes_table == nullptr) {
466 _unregistered_classes_table = new (mtClass)UnregisteredClassesTable();
467 }
468 bool created;
469 InstanceKlass** v = _unregistered_classes_table->put_if_absent(name, klass, &created);
470 if (created) {
471 name->increment_refcount();
472 }
473 return (klass == *v);
474 }
475
476 InstanceKlass* SystemDictionaryShared::get_unregistered_class(Symbol* name) {
477 assert(CDSConfig::is_dumping_archive() || ClassListWriter::is_enabled(), "sanity");
478 if (_unregistered_classes_table == nullptr) {
479 return nullptr;
480 }
481 InstanceKlass** k = _unregistered_classes_table->get(name);
482 return k != nullptr ? *k : nullptr;
483 }
484
485 void SystemDictionaryShared::copy_unregistered_class_size_and_crc32(InstanceKlass* klass) {
486 precond(CDSConfig::is_dumping_final_static_archive());
487 precond(klass->is_shared());
488
489 // A shared class must have a RunTimeClassInfo record
490 const RunTimeClassInfo* record = find_record(&_static_archive._unregistered_dictionary,
491 nullptr, klass->name());
492 precond(record != nullptr);
493 precond(record->klass() == klass);
494
495 DumpTimeClassInfo* info = get_info(klass);
496 info->_clsfile_size = record->crc()->_clsfile_size;
497 info->_clsfile_crc32 = record->crc()->_clsfile_crc32;
498 }
499
500 void SystemDictionaryShared::set_shared_class_misc_info(InstanceKlass* k, ClassFileStream* cfs) {
501 assert(CDSConfig::is_dumping_archive(), "sanity");
502 assert(!is_builtin(k), "must be unregistered class");
503 DumpTimeClassInfo* info = get_info(k);
504 info->_clsfile_size = cfs->length();
505 info->_clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
506 }
507
508 void SystemDictionaryShared::initialize() {
509 if (CDSConfig::is_dumping_archive()) {
510 _dumptime_table = new (mtClass) DumpTimeSharedClassTable;
511 LambdaProxyClassDictionary::dumptime_init();
512 if (CDSConfig::is_dumping_heap()) {
513 HeapShared::init_dumping();
514 }
515 }
516 }
517
518 void SystemDictionaryShared::init_dumptime_info(InstanceKlass* k) {
519 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
520 assert(SystemDictionaryShared::class_loading_may_happen(), "sanity");
521 DumpTimeClassInfo* info = _dumptime_table->allocate_info(k);
522 if (AOTClassFilter::is_aot_tooling_class(k)) {
523 info->set_is_aot_tooling_class();
524 }
525 }
526
527 void SystemDictionaryShared::remove_dumptime_info(InstanceKlass* k) {
528 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
529 _dumptime_table->remove(k);
530 }
531
532 void SystemDictionaryShared::handle_class_unloading(InstanceKlass* klass) {
533 if (CDSConfig::is_dumping_archive()) {
534 remove_dumptime_info(klass);
535 }
536
537 if (CDSConfig::is_dumping_archive() || ClassListWriter::is_enabled()) {
538 MutexLocker ml(Thread::current(), UnregisteredClassesTable_lock, Mutex::_no_safepoint_check_flag);
539 if (_unregistered_classes_table != nullptr) {
540 // Remove the class from _unregistered_classes_table: keep the entry but
541 // set it to null. This ensure no classes with the same name can be
542 // added again.
543 InstanceKlass** v = _unregistered_classes_table->get(klass->name());
544 if (v != nullptr) {
545 *v = nullptr;
546 }
547 }
548 } else {
549 assert(_unregistered_classes_table == nullptr, "must not be used");
550 }
551
552 if (ClassListWriter::is_enabled()) {
553 ClassListWriter cw;
554 cw.handle_class_unloading((const InstanceKlass*)klass);
555 }
556 }
557
558 void SystemDictionaryShared::init_dumptime_info_from_preimage(InstanceKlass* k) {
559 init_dumptime_info(k);
560 copy_verification_constraints_from_preimage(k);
561 copy_linking_constraints_from_preimage(k);
562
563 if (SystemDictionary::is_platform_class_loader(k->class_loader())) {
564 AOTClassLocationConfig::dumptime_set_has_platform_classes();
565 } else if (SystemDictionary::is_system_class_loader(k->class_loader())) {
566 AOTClassLocationConfig::dumptime_set_has_app_classes();
567 }
568 }
569
570 // Check if a class or any of its supertypes has been redefined.
571 bool SystemDictionaryShared::has_been_redefined(InstanceKlass* k) {
572 if (k->has_been_redefined()) {
573 return true;
574 }
575 if (k->java_super() != nullptr && has_been_redefined(k->java_super())) {
576 return true;
577 }
578 Array<InstanceKlass*>* interfaces = k->local_interfaces();
579 int len = interfaces->length();
580 for (int i = 0; i < len; i++) {
581 if (has_been_redefined(interfaces->at(i))) {
582 return true;
583 }
584 }
585 return false;
586 }
587
588 // k is a class before relocating by ArchiveBuilder
589 void SystemDictionaryShared::validate_before_archiving(InstanceKlass* k) {
590 ResourceMark rm;
591 const char* name = k->name()->as_C_string();
592 DumpTimeClassInfo* info = _dumptime_table->get(k);
593 assert(!class_loading_may_happen(), "class loading must be disabled");
594 guarantee(info != nullptr, "Class %s must be entered into _dumptime_table", name);
595 guarantee(!info->is_excluded(), "Should not attempt to archive excluded class %s", name);
596 if (is_builtin(k)) {
597 if (k->is_hidden()) {
598 if (CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
599 assert(LambdaProxyClassDictionary::is_registered_lambda_proxy_class(k), "unexpected hidden class %s", name);
600 }
601 }
602 guarantee(!k->defined_by_other_loaders(),
603 "Class loader type must be set for BUILTIN class %s", name);
604
605 } else {
606 guarantee(k->defined_by_other_loaders(),
607 "Class loader type must not be set for UNREGISTERED class %s", name);
608 }
609 }
610
611 class UnregisteredClassesDuplicationChecker : StackObj {
612 GrowableArray<InstanceKlass*> _list;
613 Thread* _thread;
614 public:
615 UnregisteredClassesDuplicationChecker() : _thread(Thread::current()) {}
616
617 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
618 if (!SystemDictionaryShared::is_builtin(k)) {
619 _list.append(k);
620 }
621 }
622
623 static int compare_by_loader(InstanceKlass** a, InstanceKlass** b) {
624 ClassLoaderData* loader_a = a[0]->class_loader_data();
625 ClassLoaderData* loader_b = b[0]->class_loader_data();
626
627 if (loader_a != loader_b) {
628 return primitive_compare(loader_a, loader_b);
629 } else {
630 return primitive_compare(a[0], b[0]);
631 }
632 }
633
634 void mark_duplicated_classes() {
635 // Two loaders may load two identical or similar hierarchies of classes. If we
636 // check for duplication in random order, we may end up excluding important base classes
637 // in both hierarchies, causing most of the classes to be excluded.
638 // We sort the classes by their loaders. This way we're likely to archive
639 // all classes in the one of the two hierarchies.
640 _list.sort(compare_by_loader);
641 for (int i = 0; i < _list.length(); i++) {
642 InstanceKlass* k = _list.at(i);
643 bool i_am_first = SystemDictionaryShared::add_unregistered_class(_thread, k);
644 if (!i_am_first) {
645 SystemDictionaryShared::warn_excluded(k, "Duplicated unregistered class");
646 SystemDictionaryShared::set_excluded_locked(k);
647 }
648 }
649 }
650 };
651
652 // Returns true if the class should be excluded. This can be called by
653 // AOTConstantPoolResolver before or after we enter the CDS safepoint.
654 // When called before the safepoint, we need to link the class so that
655 // it can be checked by check_for_exclusion().
656 bool SystemDictionaryShared::should_be_excluded(Klass* k) {
657 assert(CDSConfig::is_dumping_archive(), "sanity");
658
659 if (k->is_objArray_klass()) {
660 return should_be_excluded(ObjArrayKlass::cast(k)->bottom_klass());
661 }
662
663 if (!k->is_instance_klass()) {
664 return false;
665 } else {
666 InstanceKlass* ik = InstanceKlass::cast(k);
667
668 if (CDSConfig::is_dumping_dynamic_archive() && ik->is_shared()) {
669 // ik is already part of the static archive, so it will never be considered as excluded.
670 return false;
671 }
672
673 if (!SafepointSynchronize::is_at_safepoint() && !Thread::current()->is_Compiler_thread()) {
674 if (!ik->is_linked()) {
675 // check_for_exclusion() below doesn't link unlinked classes. We come
676 // here only when we are trying to aot-link constant pool entries, so
677 // we'd better link the class.
678 JavaThread* THREAD = JavaThread::current();
679 ik->link_class(THREAD);
680 if (HAS_PENDING_EXCEPTION) {
681 CLEAR_PENDING_EXCEPTION;
682 return true; // linking failed -- let's exclude it
683 }
684 }
685
686 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
687 DumpTimeClassInfo* p = get_info_locked(ik);
688 if (p->is_excluded()) {
689 return true;
690 }
691 return check_for_exclusion(ik, p);
692 } else {
693 // No need to check for is_linked() as all eligible classes should have
694 // already been linked in MetaspaceShared::link_class_for_cds().
695 // Can't take the lock as we are in safepoint.
696 DumpTimeClassInfo* p = _dumptime_table->get(ik);
697 if (p->is_excluded()) {
698 return true;
699 }
700 return check_for_exclusion(ik, p);
701 }
702 }
703 }
704
705 void SystemDictionaryShared::finish_exclusion_checks() {
706 if (CDSConfig::is_dumping_dynamic_archive() || CDSConfig::is_dumping_preimage_static_archive()) {
707 // Do this first -- if a base class is excluded due to duplication,
708 // all of its subclasses will also be excluded.
709 ResourceMark rm;
710 UnregisteredClassesDuplicationChecker dup_checker;
711 _dumptime_table->iterate_all_live_classes(&dup_checker);
712 dup_checker.mark_duplicated_classes();
713 }
714
715 _dumptime_table->iterate_all_live_classes([&] (InstanceKlass* k, DumpTimeClassInfo& info) {
716 SystemDictionaryShared::check_for_exclusion(k, &info);
717 });
718
719 _dumptime_table->update_counts();
720 if (CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
721 LambdaProxyClassDictionary::cleanup_dumptime_table();
722 }
723 }
724
725 bool SystemDictionaryShared::is_excluded_class(InstanceKlass* k) {
726 assert(!class_loading_may_happen(), "class loading must be disabled");
727 assert_lock_strong(DumpTimeTable_lock);
728 assert(CDSConfig::is_dumping_archive(), "sanity");
729 DumpTimeClassInfo* p = get_info_locked(k);
730 return p->is_excluded();
731 }
732
733 void SystemDictionaryShared::set_excluded_locked(InstanceKlass* k) {
734 assert_lock_strong(DumpTimeTable_lock);
735 assert(CDSConfig::is_dumping_archive(), "sanity");
736 DumpTimeClassInfo* info = get_info_locked(k);
737 info->set_excluded();
738 }
739
740 void SystemDictionaryShared::set_excluded(InstanceKlass* k) {
741 assert(CDSConfig::is_dumping_archive(), "sanity");
742 DumpTimeClassInfo* info = get_info(k);
743 info->set_excluded();
744 }
745
746 void SystemDictionaryShared::set_class_has_failed_verification(InstanceKlass* ik) {
747 assert(CDSConfig::is_dumping_archive(), "sanity");
748 DumpTimeClassInfo* p = get_info(ik);
749 p->set_failed_verification();
750 }
751
752 bool SystemDictionaryShared::has_class_failed_verification(InstanceKlass* ik) {
753 assert(CDSConfig::is_dumping_archive(), "sanity");
754 DumpTimeClassInfo* p = _dumptime_table->get(ik);
755 return (p == nullptr) ? false : p->failed_verification();
756 }
757
758 void SystemDictionaryShared::set_from_class_file_load_hook(InstanceKlass* ik) {
759 warn_excluded(ik, "From ClassFileLoadHook");
760 set_excluded(ik);
761 }
762
763 void SystemDictionaryShared::dumptime_classes_do(MetaspaceClosure* it) {
764 assert_lock_strong(DumpTimeTable_lock);
765
766 auto do_klass = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
767 if (CDSConfig::is_dumping_final_static_archive() && !k->is_loaded()) {
768 assert(k->defined_by_other_loaders(), "must be");
769 info.metaspace_pointers_do(it);
770 } else if (k->is_loader_alive() && !info.is_excluded()) {
771 info.metaspace_pointers_do(it);
772 }
773 };
774 _dumptime_table->iterate_all_live_classes(do_klass);
775
776 if (CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
777 LambdaProxyClassDictionary::dumptime_classes_do(it);
778 }
779 }
780
781 // Called from VerificationType::is_reference_assignable_from() before performing the assignability check of
782 // T1 must be assignable from T2
783 // Where:
784 // L is the class loader of <k>
785 // T1 is the type resolved by L using the name <name>
786 // T2 is the type resolved by L using the name <from_name>
787 //
788 // The meaning of (*skip_assignability_check):
789 // true: is_reference_assignable_from() should SKIP the assignability check
790 // false: is_reference_assignable_from() should COMPLETE the assignability check
791 void SystemDictionaryShared::add_verification_constraint(InstanceKlass* k, Symbol* name,
792 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object,
793 bool* skip_assignability_check) {
794 assert(CDSConfig::is_dumping_archive(), "sanity");
795 if (CDSConfig::is_dumping_dynamic_archive() && k->is_shared()) {
796 // k is a new class in the static archive, but one of its supertypes is an old class, so k wasn't
797 // verified during dump time. No need to record constraints as k won't be included in the dynamic archive.
798 return;
799 }
800 if (CDSConfig::is_dumping_aot_linked_classes() && is_builtin(k)) {
801 // There's no need to save verification constraints
802 // TODO -- double check the logic before integrating into mainline!!
803 return;
804 }
805
806 DumpTimeClassInfo* info = get_info(k);
807 info->add_verification_constraint(k, name, from_name, from_field_is_protected,
808 from_is_array, from_is_object);
809
810 if (CDSConfig::is_dumping_classic_static_archive() && !is_builtin(k)) {
811 // This applies ONLY to the "classic" CDS static dump, which reads the list of
812 // unregistered classes (those intended for custom class loaders) from the classlist
813 // and loads them using jdk.internal.misc.CDS$UnregisteredClassLoader.
814 //
815 // When the classlist contains an unregistered class k, the supertypes of k are also
816 // recorded in the classlist. However, the classlist does not contain information about
817 // any class X that's not a supertype of k but is needed in the verification of k.
818 // As a result, CDS$UnregisteredClassLoader will not know how to resolve X.
819 //
820 // Therefore, we tell the verifier to refrain from resolving X. Instead, X is recorded
821 // (symbolically) in the verification constraints of k. In the production run,
822 // when k is loaded, we will go through its verification constraints and resolve X to complete
823 // the is_reference_assignable_from() checks.
824 *skip_assignability_check = true;
825 } else {
826 // In all other cases, we are using an *actual* class loader to load k, so it should be able
827 // to resolve any types that are needed for the verification of k.
828 *skip_assignability_check = false;
829 }
830 }
831
832 void SystemDictionaryShared::add_enum_klass_static_field(InstanceKlass* ik, int root_index) {
833 assert(CDSConfig::is_dumping_heap(), "sanity");
834 DumpTimeClassInfo* info = get_info_locked(ik);
835 info->add_enum_klass_static_field(root_index);
836 }
837
838 void SystemDictionaryShared::check_verification_constraints(InstanceKlass* klass,
839 TRAPS) {
840 assert(CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
841 RunTimeClassInfo* record = RunTimeClassInfo::get_for(klass);
842
843 int length = record->num_verifier_constraints();
844 if (length > 0) {
845 for (int i = 0; i < length; i++) {
846 RunTimeClassInfo::RTVerifierConstraint* vc = record->verifier_constraint_at(i);
847 Symbol* name = vc->name();
848 Symbol* from_name = vc->from_name();
849
850 if (log_is_enabled(Trace, aot, verification)) {
851 ResourceMark rm(THREAD);
852 log_trace(aot, verification)("check_verification_constraint: %s: %s must be subclass of %s [0x%x]",
853 klass->external_name(), from_name->as_klass_external_name(),
854 name->as_klass_external_name(), record->verifier_constraint_flag(i));
855 }
856
857 bool ok = VerificationType::resolve_and_check_assignability(klass, name, from_name,
858 record->from_field_is_protected(i), record->from_is_array(i), record->from_is_object(i), CHECK);
859 if (!ok) {
860 ResourceMark rm(THREAD);
861 stringStream ss;
862
863 ss.print_cr("Bad type on operand stack");
864 ss.print_cr("Exception Details:");
865 ss.print_cr(" Location:\n %s", klass->name()->as_C_string());
866 ss.print_cr(" Reason:\n Type '%s' is not assignable to '%s'",
867 from_name->as_quoted_ascii(), name->as_quoted_ascii());
868 THROW_MSG(vmSymbols::java_lang_VerifyError(), ss.as_string());
869 }
870 }
871 }
872 }
873
874 void SystemDictionaryShared::copy_verification_constraints_from_preimage(InstanceKlass* klass) {
875 assert(CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
876 DumpTimeClassInfo* dt_info = get_info(klass);
877 RunTimeClassInfo* rt_info = RunTimeClassInfo::get_for(klass); // from preimage
878
879 int length = rt_info->num_verifier_constraints();
880 if (length > 0) {
881 for (int i = 0; i < length; i++) {
882 RunTimeClassInfo::RTVerifierConstraint* vc = rt_info->verifier_constraint_at(i);
883 Symbol* name = vc->name();
884 Symbol* from_name = vc->from_name();
885
886 dt_info->add_verification_constraint(klass, name, from_name,
887 rt_info->from_field_is_protected(i), rt_info->from_is_array(i), rt_info->from_is_object(i));
888 }
889 }
890 }
891
892 static oop get_class_loader_by(char type) {
893 if (type == (char)ClassLoader::BOOT_LOADER) {
894 return (oop)nullptr;
895 } else if (type == (char)ClassLoader::PLATFORM_LOADER) {
896 return SystemDictionary::java_platform_loader();
897 } else {
898 assert (type == (char)ClassLoader::APP_LOADER, "Sanity");
899 return SystemDictionary::java_system_loader();
900 }
901 }
902
903 // Record class loader constraints that are checked inside
904 // InstanceKlass::link_class(), so that these can be checked quickly
905 // at runtime without laying out the vtable/itables.
906 void SystemDictionaryShared::record_linking_constraint(Symbol* name, InstanceKlass* klass,
907 Handle loader1, Handle loader2) {
908 // A linking constraint check is executed when:
909 // - klass extends or implements type S
910 // - klass overrides method S.M(...) with X.M
911 // - If klass defines the method M, X is
912 // the same as klass.
913 // - If klass does not define the method M,
914 // X must be a supertype of klass and X.M is
915 // a default method defined by X.
916 // - loader1 = X->class_loader()
917 // - loader2 = S->class_loader()
918 // - loader1 != loader2
919 // - M's parameter(s) include an object type T
920 // We require that
921 // - whenever loader1 and loader2 try to
922 // resolve the type T, they must always resolve to
923 // the same InstanceKlass.
924 // NOTE: type T may or may not be currently resolved in
925 // either of these two loaders. The check itself does not
926 // try to resolve T.
927 oop klass_loader = klass->class_loader();
928
929 if (!is_system_class_loader(klass_loader) &&
930 !is_platform_class_loader(klass_loader)) {
931 // If klass is loaded by system/platform loaders, we can
932 // guarantee that klass and S must be loaded by the same
933 // respective loader between dump time and run time, and
934 // the exact same check on (name, loader1, loader2) will
935 // be executed. Hence, we can cache this check and execute
936 // it at runtime without walking the vtable/itables.
937 //
938 // This cannot be guaranteed for classes loaded by other
939 // loaders, so we bail.
940 return;
941 }
942
943 assert(is_builtin(klass), "must be");
944 assert(klass_loader != nullptr, "should not be called for boot loader");
945 assert(loader1 != loader2, "must be");
946
947 if (CDSConfig::is_dumping_dynamic_archive() && Thread::current()->is_VM_thread()) {
948 // We are re-laying out the vtable/itables of the *copy* of
949 // a class during the final stage of dynamic dumping. The
950 // linking constraints for this class has already been recorded.
951 return;
952 }
953 assert(!Thread::current()->is_VM_thread(), "must be");
954
955 assert(CDSConfig::is_dumping_archive(), "sanity");
956 DumpTimeClassInfo* info = get_info(klass);
957 info->record_linking_constraint(name, loader1, loader2);
958 }
959
960 // returns true IFF there's no need to re-initialize the i/v-tables for klass for
961 // the purpose of checking class loader constraints.
962 bool SystemDictionaryShared::check_linking_constraints(Thread* current, InstanceKlass* klass) {
963 assert(CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
964 LogTarget(Info, class, loader, constraints) log;
965 if (klass->defined_by_boot_loader()) {
966 // No class loader constraint check performed for boot classes.
967 return true;
968 }
969 if (klass->defined_by_platform_loader() || klass->defined_by_app_loader()) {
970 RunTimeClassInfo* info = RunTimeClassInfo::get_for(klass);
971 assert(info != nullptr, "Sanity");
972 if (info->num_loader_constraints() > 0) {
973 HandleMark hm(current);
974 for (int i = 0; i < info->num_loader_constraints(); i++) {
975 RunTimeClassInfo::RTLoaderConstraint* lc = info->loader_constraint_at(i);
976 Symbol* name = lc->constraint_name();
977 Handle loader1(current, get_class_loader_by(lc->_loader_type1));
978 Handle loader2(current, get_class_loader_by(lc->_loader_type2));
979 if (log.is_enabled()) {
980 ResourceMark rm(current);
981 log.print("[CDS add loader constraint for class %s symbol %s loader[0] %s loader[1] %s",
982 klass->external_name(), name->as_C_string(),
983 ClassLoaderData::class_loader_data(loader1())->loader_name_and_id(),
984 ClassLoaderData::class_loader_data(loader2())->loader_name_and_id());
985 }
986 if (!SystemDictionary::add_loader_constraint(name, klass, loader1, loader2)) {
987 // Loader constraint violation has been found. The caller
988 // will re-layout the vtable/itables to produce the correct
989 // exception.
990 if (log.is_enabled()) {
991 log.print(" failed]");
992 }
993 return false;
994 }
995 if (log.is_enabled()) {
996 log.print(" succeeded]");
997 }
998 }
999 return true; // for all recorded constraints added successfully.
1000 }
1001 }
1002 if (log.is_enabled()) {
1003 ResourceMark rm(current);
1004 log.print("[CDS has not recorded loader constraint for class %s]", klass->external_name());
1005 }
1006 return false;
1007 }
1008
1009 void SystemDictionaryShared::copy_linking_constraints_from_preimage(InstanceKlass* klass) {
1010 assert(CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
1011 JavaThread* current = JavaThread::current();
1012 if (klass->defined_by_platform_loader() || klass->defined_by_app_loader()) {
1013 RunTimeClassInfo* rt_info = RunTimeClassInfo::get_for(klass); // from preimage
1014
1015 if (rt_info->num_loader_constraints() > 0) {
1016 for (int i = 0; i < rt_info->num_loader_constraints(); i++) {
1017 RunTimeClassInfo::RTLoaderConstraint* lc = rt_info->loader_constraint_at(i);
1018 Symbol* name = lc->constraint_name();
1019 Handle loader1(current, get_class_loader_by(lc->_loader_type1));
1020 Handle loader2(current, get_class_loader_by(lc->_loader_type2));
1021 record_linking_constraint(name, klass, loader1, loader2);
1022 }
1023 }
1024 }
1025 }
1026
1027 unsigned int SystemDictionaryShared::hash_for_shared_dictionary(address ptr) {
1028 if (ArchiveBuilder::is_active() && ArchiveBuilder::current()->is_in_buffer_space(ptr)) {
1029 uintx offset = ArchiveBuilder::current()->any_to_offset(ptr);
1030 unsigned int hash = primitive_hash<uintx>(offset);
1031 DEBUG_ONLY({
1032 if (MetaspaceObj::is_shared((const MetaspaceObj*)ptr)) {
1033 assert(hash == SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr), "must be");
1034 }
1035 });
1036 return hash;
1037 } else {
1038 return SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr);
1039 }
1040 }
1041
1042 class CopySharedClassInfoToArchive : StackObj {
1043 CompactHashtableWriter* _writer;
1044 bool _is_builtin;
1045 ArchiveBuilder *_builder;
1046 public:
1047 CopySharedClassInfoToArchive(CompactHashtableWriter* writer,
1048 bool is_builtin)
1049 : _writer(writer), _is_builtin(is_builtin), _builder(ArchiveBuilder::current()) {}
1050
1051 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
1052 if (!info.is_excluded() && info.is_builtin() == _is_builtin) {
1053 size_t byte_size = info.runtime_info_bytesize();
1054 RunTimeClassInfo* record;
1055 record = (RunTimeClassInfo*)ArchiveBuilder::ro_region_alloc(byte_size);
1056 record->init(info);
1057
1058 unsigned int hash;
1059 Symbol* name = info._klass->name();
1060 name = ArchiveBuilder::current()->get_buffered_addr(name);
1061 hash = SystemDictionaryShared::hash_for_shared_dictionary((address)name);
1062 u4 delta = _builder->buffer_to_offset_u4((address)record);
1063 if (_is_builtin && info._klass->is_hidden()) {
1064 // skip
1065 } else {
1066 _writer->add(hash, delta);
1067 }
1068 if (log_is_enabled(Trace, aot, hashtables)) {
1069 ResourceMark rm;
1070 log_trace(aot, hashtables)("%s dictionary: %s", (_is_builtin ? "builtin" : "unregistered"), info._klass->external_name());
1071 }
1072
1073 // Save this for quick runtime lookup of InstanceKlass* -> RunTimeClassInfo*
1074 InstanceKlass* buffered_klass = ArchiveBuilder::current()->get_buffered_addr(info._klass);
1075 RunTimeClassInfo::set_for(buffered_klass, record);
1076 }
1077 }
1078 };
1079
1080 void SystemDictionaryShared::write_dictionary(RunTimeSharedDictionary* dictionary,
1081 bool is_builtin) {
1082 CompactHashtableStats stats;
1083 dictionary->reset();
1084 CompactHashtableWriter writer(_dumptime_table->count_of(is_builtin), &stats);
1085 CopySharedClassInfoToArchive copy(&writer, is_builtin);
1086 assert_lock_strong(DumpTimeTable_lock);
1087 _dumptime_table->iterate_all_live_classes(©);
1088 writer.dump(dictionary, is_builtin ? "builtin dictionary" : "unregistered dictionary");
1089 }
1090
1091 void SystemDictionaryShared::write_to_archive(bool is_static_archive) {
1092 ArchiveInfo* archive = get_archive(is_static_archive);
1093
1094 write_dictionary(&archive->_builtin_dictionary, true);
1095 write_dictionary(&archive->_unregistered_dictionary, false);
1096 if (CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
1097 LambdaProxyClassDictionary::write_dictionary(is_static_archive);
1098 } else {
1099 LambdaProxyClassDictionary::reset_dictionary(is_static_archive);
1100 }
1101 }
1102
1103 void SystemDictionaryShared::serialize_dictionary_headers(SerializeClosure* soc,
1104 bool is_static_archive) {
1105 ArchiveInfo* archive = get_archive(is_static_archive);
1106
1107 archive->_builtin_dictionary.serialize_header(soc);
1108 archive->_unregistered_dictionary.serialize_header(soc);
1109 LambdaProxyClassDictionary::serialize(soc, is_static_archive);
1110 }
1111
1112 void SystemDictionaryShared::serialize_vm_classes(SerializeClosure* soc) {
1113 for (auto id : EnumRange<vmClassID>{}) {
1114 soc->do_ptr(vmClasses::klass_addr_at(id));
1115 }
1116 }
1117
1118 const RunTimeClassInfo*
1119 SystemDictionaryShared::find_record(RunTimeSharedDictionary* static_dict, RunTimeSharedDictionary* dynamic_dict, Symbol* name) {
1120 if (!CDSConfig::is_using_archive() || !name->is_shared()) {
1121 // The names of all shared classes must also be a shared Symbol.
1122 return nullptr;
1123 }
1124
1125 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(name);
1126 const RunTimeClassInfo* record = nullptr;
1127 if (DynamicArchive::is_mapped()) {
1128 // Use the regenerated holder classes in the dynamic archive as they
1129 // have more methods than those in the base archive.
1130 if (LambdaFormInvokers::may_be_regenerated_class(name)) {
1131 record = dynamic_dict->lookup(name, hash, 0);
1132 if (record != nullptr) {
1133 return record;
1134 }
1135 }
1136 }
1137
1138 if (!MetaspaceShared::is_shared_dynamic(name)) {
1139 // The names of all shared classes in the static dict must also be in the
1140 // static archive
1141 record = static_dict->lookup(name, hash, 0);
1142 }
1143
1144 if (record == nullptr && DynamicArchive::is_mapped()) {
1145 record = dynamic_dict->lookup(name, hash, 0);
1146 }
1147
1148 return record;
1149 }
1150
1151 InstanceKlass* SystemDictionaryShared::find_builtin_class(Symbol* name) {
1152 const RunTimeClassInfo* record = find_record(&_static_archive._builtin_dictionary,
1153 &_dynamic_archive._builtin_dictionary,
1154 name);
1155 if (record != nullptr) {
1156 assert(!record->klass()->is_hidden(), "hidden class cannot be looked up by name");
1157 DEBUG_ONLY(check_klass_after_loading(record->klass());)
1158 // We did not save the classfile data of the generated LambdaForm invoker classes,
1159 // so we cannot support CLFH for such classes.
1160 if (record->klass()->is_generated_shared_class() && JvmtiExport::should_post_class_file_load_hook()) {
1161 return nullptr;
1162 }
1163 return record->klass();
1164 } else {
1165 return nullptr;
1166 }
1167 }
1168
1169 void SystemDictionaryShared::update_shared_entry(InstanceKlass* k, int id) {
1170 assert(CDSConfig::is_dumping_static_archive(), "class ID is used only for static dump (from classlist)");
1171 DumpTimeClassInfo* info = get_info(k);
1172 info->_id = id;
1173 }
1174
1175 const char* SystemDictionaryShared::loader_type_for_shared_class(Klass* k) {
1176 assert(k != nullptr, "Sanity");
1177 assert(k->is_shared(), "Must be");
1178 assert(k->is_instance_klass(), "Must be");
1179 InstanceKlass* ik = InstanceKlass::cast(k);
1180 if (ik->defined_by_boot_loader()) {
1181 return "boot_loader";
1182 } else if (ik->defined_by_platform_loader()) {
1183 return "platform_loader";
1184 } else if (ik->defined_by_app_loader()) {
1185 return "app_loader";
1186 } else if (ik->defined_by_other_loaders()) {
1187 return "unregistered_loader";
1188 } else {
1189 return "unknown loader";
1190 }
1191 }
1192
1193 class SharedDictionaryPrinter : StackObj {
1194 outputStream* _st;
1195 int _index;
1196 public:
1197 SharedDictionaryPrinter(outputStream* st) : _st(st), _index(0) {}
1198
1199 void do_value(const RunTimeClassInfo* record) {
1200 ResourceMark rm;
1201 _st->print_cr("%4d: %s %s", _index++, record->klass()->external_name(),
1202 SystemDictionaryShared::loader_type_for_shared_class(record->klass()));
1203 if (record->klass()->array_klasses() != nullptr) {
1204 record->klass()->array_klasses()->cds_print_value_on(_st);
1205 _st->cr();
1206 }
1207 }
1208 int index() const { return _index; }
1209 };
1210
1211 void SystemDictionaryShared::ArchiveInfo::print_on(const char* prefix,
1212 outputStream* st,
1213 bool is_static_archive) {
1214 st->print_cr("%sShared Dictionary", prefix);
1215 SharedDictionaryPrinter p(st);
1216 st->print_cr("%sShared Builtin Dictionary", prefix);
1217 _builtin_dictionary.iterate(&p);
1218 st->print_cr("%sShared Unregistered Dictionary", prefix);
1219 _unregistered_dictionary.iterate(&p);
1220 LambdaProxyClassDictionary::print_on(prefix, st, p.index(), is_static_archive);
1221 }
1222
1223 void SystemDictionaryShared::ArchiveInfo::print_table_statistics(const char* prefix,
1224 outputStream* st,
1225 bool is_static_archive) {
1226 st->print_cr("%sArchve Statistics", prefix);
1227 _builtin_dictionary.print_table_statistics(st, "Builtin Shared Dictionary");
1228 _unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary");
1229 LambdaProxyClassDictionary::print_statistics(st, is_static_archive);
1230 }
1231
1232 void SystemDictionaryShared::print_shared_archive(outputStream* st, bool is_static) {
1233 if (CDSConfig::is_using_archive()) {
1234 if (is_static) {
1235 _static_archive.print_on("", st, true);
1236 } else {
1237 if (DynamicArchive::is_mapped()) {
1238 _dynamic_archive.print_on("Dynamic ", st, false);
1239 }
1240 }
1241 }
1242 }
1243
1244 void SystemDictionaryShared::print_on(outputStream* st) {
1245 print_shared_archive(st, true);
1246 print_shared_archive(st, false);
1247 }
1248
1249 void SystemDictionaryShared::print_table_statistics(outputStream* st) {
1250 if (CDSConfig::is_using_archive()) {
1251 _static_archive.print_table_statistics("Static ", st, true);
1252 if (DynamicArchive::is_mapped()) {
1253 _dynamic_archive.print_table_statistics("Dynamic ", st, false);
1254 }
1255 }
1256 }
1257
1258 bool SystemDictionaryShared::is_dumptime_table_empty() {
1259 assert_lock_strong(DumpTimeTable_lock);
1260 _dumptime_table->update_counts();
1261 if (_dumptime_table->count_of(true) == 0 && _dumptime_table->count_of(false) == 0){
1262 return true;
1263 }
1264 return false;
1265 }
1266
1267 void SystemDictionaryShared::create_loader_positive_lookup_cache(TRAPS) {
1268 GrowableArray<InstanceKlass*> shared_classes_list;
1269 {
1270 // With static dumping, we have only a single Java thread (see JVM_StartThread) so
1271 // no no other threads should be loading classes. Otherwise, the code below may miss some
1272 // classes that are loaded concurrently.
1273 assert(CDSConfig::is_dumping_static_archive(), "no other threads should be loading classes");
1274
1275 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
1276 _dumptime_table->iterate_all_classes_in_builtin_loaders([&](InstanceKlass* k, DumpTimeClassInfo& info) {
1277 if (!k->is_hidden() && !check_for_exclusion(k, &info)) {
1278 shared_classes_list.append(k);
1279 }
1280 }
1281 );
1282 }
1283
1284 InstanceKlass* ik = vmClasses::Class_klass();
1285 objArrayOop r = oopFactory::new_objArray(ik, shared_classes_list.length(), CHECK);
1286 objArrayHandle array_h(THREAD, r);
1287
1288 for (int i = 0; i < shared_classes_list.length(); i++) {
1289 oop mirror = shared_classes_list.at(i)->java_mirror();
1290 Handle mirror_h(THREAD, mirror);
1291 array_h->obj_at_put(i, mirror_h());
1292 }
1293
1294 TempNewSymbol method = SymbolTable::new_symbol("generatePositiveLookupCache");
1295 TempNewSymbol signature = SymbolTable::new_symbol("([Ljava/lang/Class;)V");
1296
1297 JavaCallArguments args(Handle(THREAD, SystemDictionary::java_system_loader()));
1298 args.push_oop(array_h);
1299 JavaValue result(T_VOID);
1300 JavaCalls::call_virtual(&result,
1301 vmClasses::jdk_internal_loader_ClassLoaders_AppClassLoader_klass(),
1302 method,
1303 signature,
1304 &args,
1305 CHECK);
1306
1307 if (HAS_PENDING_EXCEPTION) {
1308 Handle exc_handle(THREAD, PENDING_EXCEPTION);
1309 CLEAR_PENDING_EXCEPTION;
1310 ResourceMark rm(THREAD);
1311
1312 log_warning(cds)("Exception during AppClassLoader::generatePositiveLookupCache() call");
1313 LogStreamHandle(Debug, cds) log;
1314 if (log.is_enabled()) {
1315 java_lang_Throwable::print_stack_trace(exc_handle, &log);
1316 }
1317 return;
1318 }
1319 }