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