1 /*
2 * Copyright (c) 2014, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/archiveBuilder.hpp"
27 #include "cds/archiveHeapLoader.hpp"
28 #include "cds/archiveUtils.hpp"
29 #include "cds/cdsConfig.hpp"
30 #include "cds/classListParser.hpp"
31 #include "cds/classListWriter.hpp"
32 #include "cds/classPreinitializer.hpp"
33 #include "cds/dynamicArchive.hpp"
34 #include "cds/filemap.hpp"
35 #include "cds/heapShared.hpp"
36 #include "cds/cdsProtectionDomain.hpp"
37 #include "cds/dumpTimeClassInfo.inline.hpp"
38 #include "cds/lambdaFormInvokers.inline.hpp"
39 #include "cds/metaspaceShared.hpp"
40 #include "cds/methodDataDictionary.hpp"
41 #include "cds/runTimeClassInfo.hpp"
42 #include "classfile/classFileStream.hpp"
43 #include "classfile/classLoader.hpp"
44 #include "classfile/classLoaderData.inline.hpp"
45 #include "classfile/classLoaderDataGraph.hpp"
46 #include "classfile/classLoaderExt.hpp"
47 #include "classfile/dictionary.hpp"
48 #include "classfile/javaClasses.hpp"
49 #include "classfile/javaClasses.inline.hpp"
50 #include "classfile/symbolTable.hpp"
51 #include "classfile/systemDictionary.hpp"
52 #include "classfile/systemDictionaryShared.hpp"
53 #include "classfile/verificationType.hpp"
54 #include "classfile/vmClasses.hpp"
55 #include "classfile/vmSymbols.hpp"
56 #include "interpreter/bootstrapInfo.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/instanceKlass.hpp"
67 #include "oops/klass.inline.hpp"
68 #include "oops/methodData.hpp"
69 #include "oops/trainingData.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 DumpTimeLambdaProxyClassDictionary* SystemDictionaryShared::_dumptime_lambda_proxy_class_dictionary = nullptr;
88
89 DumpTimeMethodInfoDictionary* SystemDictionaryShared::_dumptime_method_info_dictionary = nullptr;
90 DumpTimeMethodInfoDictionary* SystemDictionaryShared::_cloned_dumptime_method_info_dictionary = nullptr;
91 static Array<InstanceKlass*>* _archived_lambda_form_classes = nullptr;
92 static Array<InstanceKlass*>* _archived_lambda_proxy_classes_boot = nullptr;
93 static Array<InstanceKlass*>* _archived_lambda_proxy_classes_boot2 = nullptr;
94 static Array<InstanceKlass*>* _archived_lambda_proxy_classes_platform = nullptr;
95 static Array<InstanceKlass*>* _archived_lambda_proxy_classes_app = nullptr;
96 static bool _ignore_new_classes = false;
97
98 // Used by NoClassLoadingMark
99 DEBUG_ONLY(bool SystemDictionaryShared::_class_loading_may_happen = true;)
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 //assert(!k->is_shared(), "sanity"); // FIXME new workflow
203 return get_info_locked(k);
204 }
205
206 DumpTimeClassInfo* SystemDictionaryShared::get_info_locked(InstanceKlass* k) {
207 assert_lock_strong(DumpTimeTable_lock);
208 //assert(!k->is_shared(), "sanity"); // FIXME new workflow
209 DumpTimeClassInfo* info = _dumptime_table->get_info(k);
210 assert(info != nullptr, "must be");
211 return info;
212 }
213
214 void SystemDictionaryShared::mark_required_class(InstanceKlass* k) {
215 DumpTimeClassInfo* info = _dumptime_table->get(k);
216 ResourceMark rm;
217 if (info != nullptr) {
218 info->set_is_required();
219 }
220 }
221
222 bool SystemDictionaryShared::check_for_exclusion(InstanceKlass* k, DumpTimeClassInfo* info) {
223 if (!CDSConfig::is_dumping_final_static_archive() && MetaspaceShared::is_in_shared_metaspace(k)) {
224 // We have reached a super type that's already in the base archive. Treat it
225 // as "not excluded".
226 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
227 return false;
228 }
229
230 if (info == nullptr) {
231 info = _dumptime_table->get(k);
232 assert(info != nullptr, "supertypes of any classes in _dumptime_table must either be shared, or must also be in _dumptime_table");
233 }
234
235 if (!info->has_checked_exclusion()) {
236 if (check_for_exclusion_impl(k)) {
237 info->set_excluded();
238 }
239 info->set_has_checked_exclusion();
240 }
241
242 return info->is_excluded();
243 }
244
245 // Returns true so the caller can do: return warn_excluded(".....");
246 bool SystemDictionaryShared::warn_excluded(InstanceKlass* k, const char* reason) {
247 ResourceMark rm;
248 log_warning(cds)("Skipping %s: %s", k->name()->as_C_string(), reason);
249 return true;
250 }
251
252 bool SystemDictionaryShared::is_jfr_event_class(InstanceKlass *k) {
253 while (k) {
254 if (k->name()->equals("jdk/internal/event/Event")) {
255 return true;
256 }
257 k = k->java_super();
258 }
259 return false;
260 }
261
262 bool SystemDictionaryShared::is_registered_lambda_proxy_class(InstanceKlass* ik) {
263 DumpTimeClassInfo* info = _dumptime_table->get(ik);
264 return (info != nullptr) ? info->_is_archived_lambda_proxy : false;
265 }
266
267 void SystemDictionaryShared::reset_registered_lambda_proxy_class(InstanceKlass* ik) {
268 DumpTimeClassInfo* info = _dumptime_table->get(ik);
269 if (info != nullptr) {
270 info->_is_archived_lambda_proxy = false;
271 info->set_excluded();
272 }
273 }
274
275 bool SystemDictionaryShared::is_early_klass(InstanceKlass* ik) {
276 DumpTimeClassInfo* info = _dumptime_table->get(ik);
277 return (info != nullptr) ? info->is_early_klass() : false;
278 }
279
280 bool SystemDictionaryShared::is_hidden_lambda_proxy(InstanceKlass* ik) {
281 assert(ik->is_shared(), "applicable to only a shared class");
282 if (ik->is_hidden()) {
283 return true;
284 } else {
285 return false;
286 }
287 }
288
289 void SystemDictionaryShared::ignore_new_classes() {
290 _ignore_new_classes = true;
291 }
292
293
294 bool SystemDictionaryShared::check_for_exclusion_impl(InstanceKlass* k) {
295 if (CDSConfig::is_dumping_final_static_archive() && k->is_shared_unregistered_class()
296 && k->is_shared()) {
297 return false; // Do not exclude: unregistered classes are passed from preimage to final image.
298 }
299
300 if (k->is_in_error_state()) {
301 return warn_excluded(k, "In error state");
302 }
303 if (k->is_scratch_class()) {
304 return warn_excluded(k, "A scratch class");
305 }
306 if (!k->is_loaded()) {
307 return warn_excluded(k, "Not in loaded state");
308 }
309 if (has_been_redefined(k)) {
310 return warn_excluded(k, "Has been redefined");
311 }
312 if (!k->is_hidden() && k->shared_classpath_index() < 0 && is_builtin(k)) {
313 // These are classes loaded from unsupported locations (such as those loaded by JVMTI native
314 // agent during dump time).
315 return warn_excluded(k, "Unsupported location");
316 }
317 if (k->signers() != nullptr) {
318 // We cannot include signed classes in the archive because the certificates
319 // used during dump time may be different than those used during
320 // runtime (due to expiration, etc).
321 return warn_excluded(k, "Signed JAR");
322 }
323 if (is_jfr_event_class(k)) {
324 // We cannot include JFR event classes because they need runtime-specific
325 // instrumentation in order to work with -XX:FlightRecorderOptions:retransform=false.
326 // There are only a small number of these classes, so it's not worthwhile to
327 // support them and make CDS more complicated.
328 if (!CDSConfig::is_dumping_reflection_data()) { // FIXME: !!! HACK !!!
329 return warn_excluded(k, "JFR event class");
330 }
331 }
332
333 if (!CDSConfig::preserve_all_dumptime_verification_states(k)) {
334 if (!k->is_linked()) {
335 if (has_class_failed_verification(k)) {
336 return warn_excluded(k, "Failed verification");
337 }
338 } else {
339 if (!k->can_be_verified_at_dumptime()) {
340 // We have an old class that has been linked (e.g., it's been executed during
341 // dump time). This class has been verified using the old verifier, which
342 // doesn't save the verification constraints, so check_verification_constraints()
343 // won't work at runtime.
344 // As a result, we cannot store this class. It must be loaded and fully verified
345 // at runtime.
346 return warn_excluded(k, "Old class has been linked");
347 }
348 }
349 }
350
351 if (k->is_hidden() && !should_hidden_class_be_archived(k)) {
352 log_info(cds)("Skipping %s: Hidden class", k->name()->as_C_string());
353 return true;
354 }
355
356 InstanceKlass* super = k->java_super();
357 if (super != nullptr && check_for_exclusion(super, nullptr)) {
358 ResourceMark rm;
359 log_warning(cds)("Skipping %s: super class %s is excluded", k->name()->as_C_string(), super->name()->as_C_string());
360 return true;
361 }
362
363 Array<InstanceKlass*>* interfaces = k->local_interfaces();
364 int len = interfaces->length();
365 for (int i = 0; i < len; i++) {
366 InstanceKlass* intf = interfaces->at(i);
367 if (check_for_exclusion(intf, nullptr)) {
368 ResourceMark rm;
369 log_warning(cds)("Skipping %s: interface %s is excluded", k->name()->as_C_string(), intf->name()->as_C_string());
370 return true;
371 }
372 }
373
374 return false; // false == k should NOT be excluded
375 }
376
377 bool SystemDictionaryShared::is_builtin_loader(ClassLoaderData* loader_data) {
378 oop class_loader = loader_data->class_loader();
379 return (class_loader == nullptr ||
380 SystemDictionary::is_system_class_loader(class_loader) ||
381 SystemDictionary::is_platform_class_loader(class_loader));
382 }
383
384 bool SystemDictionaryShared::has_platform_or_app_classes() {
385 if (FileMapInfo::current_info()->has_platform_or_app_classes()) {
386 return true;
387 }
388 if (DynamicArchive::is_mapped() &&
389 FileMapInfo::dynamic_info()->has_platform_or_app_classes()) {
390 return true;
391 }
392 return false;
393 }
394
395 // The following stack shows how this code is reached:
396 //
397 // [0] SystemDictionaryShared::find_or_load_shared_class()
398 // [1] JVM_FindLoadedClass
399 // [2] java.lang.ClassLoader.findLoadedClass0()
400 // [3] java.lang.ClassLoader.findLoadedClass()
401 // [4] jdk.internal.loader.BuiltinClassLoader.loadClassOrNull()
402 // [5] jdk.internal.loader.BuiltinClassLoader.loadClass()
403 // [6] jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(), or
404 // jdk.internal.loader.ClassLoaders$PlatformClassLoader.loadClass()
405 //
406 // AppCDS supports fast class loading for these 2 built-in class loaders:
407 // jdk.internal.loader.ClassLoaders$PlatformClassLoader
408 // jdk.internal.loader.ClassLoaders$AppClassLoader
409 // with the following assumptions (based on the JDK core library source code):
410 //
411 // [a] these two loaders use the BuiltinClassLoader.loadClassOrNull() to
412 // load the named class.
413 // [b] BuiltinClassLoader.loadClassOrNull() first calls findLoadedClass(name).
414 // [c] At this point, if we can find the named class inside the
415 // shared_dictionary, we can perform further checks (see
416 // SystemDictionary::is_shared_class_visible) to ensure that this class
417 // was loaded by the same class loader during dump time.
418 //
419 // Given these assumptions, we intercept the findLoadedClass() call to invoke
420 // SystemDictionaryShared::find_or_load_shared_class() to load the shared class from
421 // the archive for the 2 built-in class loaders. This way,
422 // we can improve start-up because we avoid decoding the classfile,
423 // and avoid delegating to the parent loader.
424 //
425 // NOTE: there's a lot of assumption about the Java code. If any of that change, this
426 // needs to be redesigned.
427
428 InstanceKlass* SystemDictionaryShared::find_or_load_shared_class(
429 Symbol* name, Handle class_loader, TRAPS) {
430 InstanceKlass* k = nullptr;
431 if (CDSConfig::is_using_archive()) {
432 if (!has_platform_or_app_classes()) {
433 return nullptr;
434 }
435
436 if (SystemDictionary::is_system_class_loader(class_loader()) ||
437 SystemDictionary::is_platform_class_loader(class_loader())) {
438 // Fix for 4474172; see evaluation for more details
439 class_loader = Handle(
440 THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader()));
441 ClassLoaderData *loader_data = register_loader(class_loader);
442 Dictionary* dictionary = loader_data->dictionary();
443
444 // Note: currently, find_or_load_shared_class is called only from
445 // JVM_FindLoadedClass and used for PlatformClassLoader and AppClassLoader,
446 // which are parallel-capable loaders, so a lock here is NOT taken.
447 assert(get_loader_lock_or_null(class_loader) == nullptr, "ObjectLocker not required");
448 {
449 MutexLocker mu(THREAD, SystemDictionary_lock);
450 InstanceKlass* check = dictionary->find_class(THREAD, name);
451 if (check != nullptr) {
452 return check;
453 }
454 }
455
456 k = load_shared_class_for_builtin_loader(name, class_loader, THREAD);
457 if (k != nullptr) {
458 SharedClassLoadingMark slm(THREAD, k);
459 k = find_or_define_instance_class(name, class_loader, k, CHECK_NULL);
460 }
461 }
462 }
463 return k;
464 }
465
466 class UnregisteredClassesTable : public ResourceHashtable<
467 Symbol*, InstanceKlass*,
468 15889, // prime number
469 AnyObj::C_HEAP> {};
470
471 static UnregisteredClassesTable* _unregistered_classes_table = nullptr;
472
473 // true == class was successfully added; false == a duplicated class (with the same name) already exists.
474 bool SystemDictionaryShared::add_unregistered_class(Thread* current, InstanceKlass* klass) {
475 // We don't allow duplicated unregistered classes with the same name.
476 // We only archive the first class with that name that succeeds putting
477 // itself into the table.
478 assert(CDSConfig::is_dumping_archive() || ClassListWriter::is_enabled(), "sanity");
479 MutexLocker ml(current, UnregisteredClassesTable_lock, Mutex::_no_safepoint_check_flag);
480 Symbol* name = klass->name();
481 if (_unregistered_classes_table == nullptr) {
482 _unregistered_classes_table = new (mtClass)UnregisteredClassesTable();
483 }
484 bool created;
485 InstanceKlass** v = _unregistered_classes_table->put_if_absent(name, klass, &created);
486 if (created) {
487 name->increment_refcount();
488 }
489 return (klass == *v);
490 }
491
492 // This function is called to lookup the super/interfaces of shared classes for
493 // unregistered loaders. E.g., SharedClass in the below example
494 // where "super:" (and optionally "interface:") have been specified.
495 //
496 // java/lang/Object id: 0
497 // Interface id: 2 super: 0 source: cust.jar
498 // SharedClass id: 4 super: 0 interfaces: 2 source: cust.jar
499 InstanceKlass* SystemDictionaryShared::lookup_super_for_unregistered_class(
500 Symbol* class_name, Symbol* super_name, bool is_superclass) {
501
502 assert(CDSConfig::is_dumping_static_archive(), "only when static dumping");
503
504 if (!ClassListParser::is_parsing_thread()) {
505 // Unregistered classes can be created only by ClassListParser::_parsing_thread.
506
507 return nullptr;
508 }
509
510 ClassListParser* parser = ClassListParser::instance();
511 if (parser == nullptr) {
512 // We're still loading the well-known classes, before the ClassListParser is created.
513 return nullptr;
514 }
515 if (class_name->equals(parser->current_class_name())) {
516 // When this function is called, all the numbered super and interface types
517 // must have already been loaded. Hence this function is never recursively called.
518 if (is_superclass) {
519 return parser->lookup_super_for_current_class(super_name);
520 } else {
521 return parser->lookup_interface_for_current_class(super_name);
522 }
523 } else {
524 // The VM is not trying to resolve a super type of parser->current_class_name().
525 // Instead, it's resolving an error class (because parser->current_class_name() has
526 // failed parsing or verification). Don't do anything here.
527 return nullptr;
528 }
529 }
530
531 void SystemDictionaryShared::set_shared_class_misc_info(InstanceKlass* k, ClassFileStream* cfs) {
532 assert(CDSConfig::is_dumping_archive(), "sanity");
533 assert(!is_builtin(k), "must be unregistered class");
534 DumpTimeClassInfo* info = get_info(k);
535 info->_clsfile_size = cfs->length();
536 info->_clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
537 }
538
539 void SystemDictionaryShared::initialize() {
540 if (CDSConfig::is_dumping_archive()) {
541 _dumptime_table = new (mtClass) DumpTimeSharedClassTable;
542 _dumptime_lambda_proxy_class_dictionary =
543 new (mtClass) DumpTimeLambdaProxyClassDictionary;
544 _dumptime_method_info_dictionary = new (mtClass) DumpTimeMethodInfoDictionary;
545 }
546 }
547
548 void SystemDictionaryShared::init_dumptime_info(InstanceKlass* k) {
549 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
550 assert(SystemDictionaryShared::class_loading_may_happen(), "sanity");
551 DumpTimeClassInfo* info = _dumptime_table->allocate_info(k);
552 if (_ignore_new_classes) {
553 if (!LambdaFormInvokers::may_be_regenerated_class(k->name())) {
554 ResourceMark rm;
555 log_debug(cds)("Skipping %s: Class loaded for lambda form invoker regeneration", k->name()->as_C_string());
556 info->set_excluded();
557 }
558 }
559 }
560
561 void SystemDictionaryShared::remove_dumptime_info(InstanceKlass* k) {
562 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
563 _dumptime_table->remove(k);
564 }
565
566 void SystemDictionaryShared::handle_class_unloading(InstanceKlass* klass) {
567 if (CDSConfig::is_dumping_archive()) {
568 remove_dumptime_info(klass);
569 }
570
571 if (CDSConfig::is_dumping_archive() || ClassListWriter::is_enabled()) {
572 MutexLocker ml(Thread::current(), UnregisteredClassesTable_lock, Mutex::_no_safepoint_check_flag);
573 if (_unregistered_classes_table != nullptr) {
574 // Remove the class from _unregistered_classes_table: keep the entry but
575 // set it to null. This ensure no classes with the same name can be
576 // added again.
577 InstanceKlass** v = _unregistered_classes_table->get(klass->name());
578 if (v != nullptr) {
579 *v = nullptr;
580 }
581 }
582 } else {
583 assert(_unregistered_classes_table == nullptr, "must not be used");
584 }
585
586 if (ClassListWriter::is_enabled()) {
587 ClassListWriter cw;
588 cw.handle_class_unloading((const InstanceKlass*)klass);
589 }
590 }
591
592 // Check if a class or any of its supertypes has been redefined.
593 bool SystemDictionaryShared::has_been_redefined(InstanceKlass* k) {
594 if (k->has_been_redefined()) {
595 return true;
596 }
597 if (k->java_super() != nullptr && has_been_redefined(k->java_super())) {
598 return true;
599 }
600 Array<InstanceKlass*>* interfaces = k->local_interfaces();
601 int len = interfaces->length();
602 for (int i = 0; i < len; i++) {
603 if (has_been_redefined(interfaces->at(i))) {
604 return true;
605 }
606 }
607 return false;
608 }
609
610 // k is a class before relocating by ArchiveBuilder
611 void SystemDictionaryShared::validate_before_archiving(InstanceKlass* k) {
612 ResourceMark rm;
613 const char* name = k->name()->as_C_string();
614 DumpTimeClassInfo* info = _dumptime_table->get(k);
615 assert(!class_loading_may_happen(), "class loading must be disabled");
616 guarantee(info != nullptr, "Class %s must be entered into _dumptime_table", name);
617 guarantee(!info->is_excluded(), "Should not attempt to archive excluded class %s", name);
618 if (is_builtin(k)) {
619 if (k->is_hidden()) {
620 if (CDSConfig::is_dumping_invokedynamic()) { // FIXME -- clean up
621 return;
622 }
623 assert(should_hidden_class_be_archived(k), "unexpected hidden class %s", name);
624 }
625 guarantee(!k->is_shared_unregistered_class(),
626 "Class loader type must be set for BUILTIN class %s", name);
627
628 } else {
629 guarantee(k->is_shared_unregistered_class(),
630 "Class loader type must not be set for UNREGISTERED class %s", name);
631 }
632 }
633
634 class UnregisteredClassesDuplicationChecker : StackObj {
635 GrowableArray<InstanceKlass*> _list;
636 Thread* _thread;
637 public:
638 UnregisteredClassesDuplicationChecker() : _thread(Thread::current()) {}
639
640 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
641 if (!SystemDictionaryShared::is_builtin(k)) {
642 _list.append(k);
643 }
644 }
645
646 static int compare_by_loader(InstanceKlass** a, InstanceKlass** b) {
647 ClassLoaderData* loader_a = a[0]->class_loader_data();
648 ClassLoaderData* loader_b = b[0]->class_loader_data();
649
650 if (loader_a != loader_b) {
651 return primitive_compare(loader_a, loader_b);
652 } else {
653 return primitive_compare(a[0], b[0]);
654 }
655 }
656
657 void mark_duplicated_classes() {
658 // Two loaders may load two identical or similar hierarchies of classes. If we
659 // check for duplication in random order, we may end up excluding important base classes
660 // in both hierarchies, causing most of the classes to be excluded.
661 // We sort the classes by their loaders. This way we're likely to archive
662 // all classes in the one of the two hierarchies.
663 _list.sort(compare_by_loader);
664 for (int i = 0; i < _list.length(); i++) {
665 InstanceKlass* k = _list.at(i);
666 bool i_am_first = SystemDictionaryShared::add_unregistered_class(_thread, k);
667 if (!i_am_first) {
668 SystemDictionaryShared::warn_excluded(k, "Duplicated unregistered class");
669 SystemDictionaryShared::set_excluded_locked(k);
670 }
671 }
672 }
673 };
674
675 void SystemDictionaryShared::scan_constant_pool(InstanceKlass* k) {
676 k->constants()->find_archivable_hidden_classes();
677 }
678
679 bool SystemDictionaryShared::should_hidden_class_be_archived(InstanceKlass* k) {
680 assert(k->is_hidden(), "sanity");
681 if (is_registered_lambda_proxy_class(k)) {
682 return true;
683 }
684
685 if (CDSConfig::is_dumping_invokedynamic()) {
686 if (HeapShared::is_archivable_hidden_klass(k)) {
687 return true;
688 }
689
690 // TODO: merge the following with HeapShared::is_archivable_hidden_klass()
691 DumpTimeClassInfo* info = _dumptime_table->get(k);
692 if (info != nullptr && info->is_required()) {
693 return true;
694 }
695 }
696
697 return false;
698 }
699
700 void SystemDictionaryShared::check_excluded_classes() {
701 assert(!class_loading_may_happen(), "class loading must be disabled");
702 assert_lock_strong(DumpTimeTable_lock);
703
704 if (CDSConfig::is_dumping_dynamic_archive()) {
705 // Do this first -- if a base class is excluded due to duplication,
706 // all of its subclasses will also be excluded.
707 ResourceMark rm;
708 UnregisteredClassesDuplicationChecker dup_checker;
709 _dumptime_table->iterate_all_live_classes(&dup_checker);
710 dup_checker.mark_duplicated_classes();
711 }
712
713 ResourceMark rm;
714
715 // First, scan all non-hidden classes
716 auto check_non_hidden = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
717 if (!k->is_hidden()) {
718 SystemDictionaryShared::check_for_exclusion(k, &info);
719 if (!info.is_excluded() && !info.has_scanned_constant_pool()) {
720 scan_constant_pool(k);
721 info.set_has_scanned_constant_pool();
722 }
723 }
724 };
725 _dumptime_table->iterate_all_live_classes(check_non_hidden);
726
727 // Then, scan all that hidden classes that have been marked as required, until
728 // we reach a stable state.
729 bool made_progress;
730 do {
731 made_progress = false;
732 auto check_hidden = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
733 if (k->is_hidden() && should_hidden_class_be_archived(k)) {
734 SystemDictionaryShared::check_for_exclusion(k, &info);
735 if (info.is_excluded()) {
736 assert(!info.is_required(), "A required hidden class cannot be marked as excluded");
737 } else if (!info.has_scanned_constant_pool()) {
738 scan_constant_pool(k);
739 info.set_has_scanned_constant_pool();
740 // The CP entries in k *MAY* refer to other hidden classes, so scan
741 // every hidden class again.
742 made_progress = true;
743 }
744 }
745 };
746 _dumptime_table->iterate_all_live_classes(check_hidden);
747 } while (made_progress);
748
749 // Now, all hidden classes that have not yet been scanned should be excluded
750 auto exclude_remaining_hidden = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
751 if (k->is_hidden() && !info.has_checked_exclusion()) {
752 SystemDictionaryShared::check_for_exclusion(k, &info);
753 assert(info.is_excluded(), "Must be");
754 }
755 };
756 _dumptime_table->iterate_all_live_classes(exclude_remaining_hidden);
757 _dumptime_table->update_counts();
758
759 cleanup_lambda_proxy_class_dictionary();
760
761 cleanup_method_info_dictionary();
762
763 TrainingData::cleanup_training_data();
764 }
765
766 bool SystemDictionaryShared::is_excluded_class(InstanceKlass* k) {
767 assert(!class_loading_may_happen(), "class loading must be disabled");
768 assert_lock_strong(DumpTimeTable_lock);
769 assert(CDSConfig::is_dumping_archive(), "sanity");
770 DumpTimeClassInfo* p = get_info_locked(k);
771 return p->is_excluded();
772 }
773
774 void SystemDictionaryShared::set_excluded_locked(InstanceKlass* k) {
775 assert_lock_strong(DumpTimeTable_lock);
776 assert(CDSConfig::is_dumping_archive(), "sanity");
777 DumpTimeClassInfo* info = get_info_locked(k);
778 info->set_excluded();
779 }
780
781 void SystemDictionaryShared::set_excluded(InstanceKlass* k) {
782 assert(CDSConfig::is_dumping_archive(), "sanity");
783 DumpTimeClassInfo* info = get_info(k);
784 info->set_excluded();
785 }
786
787 void SystemDictionaryShared::set_class_has_failed_verification(InstanceKlass* ik) {
788 assert(CDSConfig::is_dumping_archive(), "sanity");
789 DumpTimeClassInfo* p = get_info(ik);
790 p->set_failed_verification();
791 }
792
793 bool SystemDictionaryShared::has_class_failed_verification(InstanceKlass* ik) {
794 assert(CDSConfig::is_dumping_archive(), "sanity");
795 DumpTimeClassInfo* p = _dumptime_table->get(ik);
796 return (p == nullptr) ? false : p->failed_verification();
797 }
798
799 void SystemDictionaryShared::dumptime_classes_do(class MetaspaceClosure* it) {
800 assert_lock_strong(DumpTimeTable_lock);
801
802 auto do_klass = [&] (InstanceKlass* k, DumpTimeClassInfo& info) {
803 if (CDSConfig::is_dumping_final_static_archive() && !k->is_loaded()) {
804 assert(k->is_shared_unregistered_class(), "must be");
805 info.metaspace_pointers_do(it);
806 } else if (k->is_loader_alive() && !info.is_excluded()) {
807 info.metaspace_pointers_do(it);
808 }
809 };
810 _dumptime_table->iterate_all_live_classes(do_klass);
811
812 auto do_lambda = [&] (LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
813 if (key.caller_ik()->is_loader_alive()) {
814 info.metaspace_pointers_do(it);
815 key.metaspace_pointers_do(it);
816 }
817 };
818 _dumptime_lambda_proxy_class_dictionary->iterate_all(do_lambda);
819
820 auto do_method_info = [&] (MethodDataKey& key, DumpTimeMethodDataInfo& info) {
821 info.metaspace_pointers_do(it);
822 key.metaspace_pointers_do(it);
823 };
824 _dumptime_method_info_dictionary->iterate_all(do_method_info);
825 }
826
827 bool SystemDictionaryShared::add_verification_constraint(InstanceKlass* k, Symbol* name,
828 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) {
829 assert(CDSConfig::is_dumping_archive(), "sanity");
830 if (CDSConfig::is_dumping_dynamic_archive() && k->is_shared()) {
831 // k is a new class in the static archive, but one of its supertypes is an old class, so k wasn't
832 // verified during dump time. No need to record constraints as k won't be included in the dynamic archive.
833 return false;
834 }
835 if (PreloadSharedClasses && is_builtin(k)) {
836 // There's no need to save verification constraints
837 return false;
838 }
839
840 DumpTimeClassInfo* info = get_info(k);
841 info->add_verification_constraint(k, name, from_name, from_field_is_protected,
842 from_is_array, from_is_object);
843
844 if (CDSConfig::is_dumping_dynamic_archive()) {
845 // For dynamic dumping, we can resolve all the constraint classes for all class loaders during
846 // the initial run prior to creating the archive before vm exit. We will also perform verification
847 // check when running with the archive.
848 return false;
849 } else {
850 if (is_builtin(k)) {
851 // For builtin class loaders, we can try to complete the verification check at dump time,
852 // because we can resolve all the constraint classes. We will also perform verification check
853 // when running with the archive.
854 return false;
855 } else {
856 // For non-builtin class loaders, we cannot complete the verification check at dump time,
857 // because at dump time we don't know how to resolve classes for such loaders.
858 return true;
859 }
860 }
861 }
862
863 void SystemDictionaryShared::add_enum_klass_static_field(InstanceKlass* ik, int root_index) {
864 assert(CDSConfig::is_dumping_heap(), "sanity");
865 DumpTimeClassInfo* info = get_info_locked(ik);
866 info->add_enum_klass_static_field(root_index);
867 }
868
869 void SystemDictionaryShared::add_to_dump_time_lambda_proxy_class_dictionary(LambdaProxyClassKey& key,
870 InstanceKlass* proxy_klass) {
871 assert_lock_strong(DumpTimeTable_lock);
872
873 bool created;
874 DumpTimeLambdaProxyClassInfo* info = _dumptime_lambda_proxy_class_dictionary->put_if_absent(key, &created);
875 info->add_proxy_klass(proxy_klass);
876 if (created) {
877 ++_dumptime_lambda_proxy_class_dictionary->_count;
878 }
879 }
880
881 void SystemDictionaryShared::add_lambda_proxy_class(InstanceKlass* caller_ik,
882 InstanceKlass* lambda_ik,
883 Symbol* invoked_name,
884 Symbol* invoked_type,
885 Symbol* method_type,
886 Method* member_method,
887 Symbol* instantiated_method_type,
888 TRAPS) {
889 if (CDSConfig::is_dumping_invokedynamic()) {
890 // The proxy classes will be accessible through the archived CP entries.
891 return;
892 }
893 if (CDSConfig::is_dumping_preimage_static_archive() || CDSConfig::is_dumping_final_static_archive()) {
894 // TODO: not supported in new workflow
895 return;
896 }
897
898 assert(caller_ik->class_loader() == lambda_ik->class_loader(), "mismatched class loader");
899 assert(caller_ik->class_loader_data() == lambda_ik->class_loader_data(), "mismatched class loader data");
900 assert(java_lang_Class::class_data(lambda_ik->java_mirror()) == nullptr, "must not have class data");
901
902 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
903
904 lambda_ik->assign_class_loader_type();
905 lambda_ik->set_shared_classpath_index(caller_ik->shared_classpath_index());
906 InstanceKlass* nest_host = caller_ik->nest_host(CHECK);
907 assert(nest_host != nullptr, "unexpected nullptr nest_host");
908
909 DumpTimeClassInfo* info = _dumptime_table->get(lambda_ik);
910 if (info != nullptr && !lambda_ik->is_non_strong_hidden() && is_builtin(lambda_ik) && is_builtin(caller_ik)
911 // Don't include the lambda proxy if its nest host is not in the "linked" state.
912 && nest_host->is_linked()) {
913 // Set _is_archived_lambda_proxy in DumpTimeClassInfo so that the lambda_ik
914 // won't be excluded during dumping of shared archive. See ExcludeDumpTimeSharedClasses.
915 info->_is_archived_lambda_proxy = true;
916 info->set_nest_host(nest_host);
917
918 LambdaProxyClassKey key(caller_ik,
919 invoked_name,
920 invoked_type,
921 method_type,
922 member_method,
923 instantiated_method_type);
924 add_to_dump_time_lambda_proxy_class_dictionary(key, lambda_ik);
925 }
926 }
927
928 InstanceKlass* SystemDictionaryShared::get_shared_lambda_proxy_class(InstanceKlass* caller_ik,
929 Symbol* invoked_name,
930 Symbol* invoked_type,
931 Symbol* method_type,
932 Method* member_method,
933 Symbol* instantiated_method_type) {
934 if (CDSConfig::is_dumping_final_static_archive()) {
935 return nullptr;
936 }
937 MutexLocker ml(CDSLambda_lock, Mutex::_no_safepoint_check_flag);
938 LambdaProxyClassKey key(caller_ik, invoked_name, invoked_type,
939 method_type, member_method, instantiated_method_type);
940
941 // Try to retrieve the lambda proxy class from static archive.
942 const RunTimeLambdaProxyClassInfo* info = _static_archive.lookup_lambda_proxy_class(&key);
943 InstanceKlass* proxy_klass = retrieve_lambda_proxy_class(info);
944 if (proxy_klass == nullptr) {
945 if (info != nullptr && log_is_enabled(Debug, cds)) {
946 ResourceMark rm;
947 log_debug(cds)("Used all static archived lambda proxy classes for: %s %s%s",
948 caller_ik->external_name(), invoked_name->as_C_string(), invoked_type->as_C_string());
949 }
950 } else {
951 return proxy_klass;
952 }
953
954 // Retrieving from static archive is unsuccessful, try dynamic archive.
955 info = _dynamic_archive.lookup_lambda_proxy_class(&key);
956 proxy_klass = retrieve_lambda_proxy_class(info);
957 if (proxy_klass == nullptr) {
958 if (info != nullptr && log_is_enabled(Debug, cds)) {
959 ResourceMark rm;
960 log_debug(cds)("Used all dynamic archived lambda proxy classes for: %s %s%s",
961 caller_ik->external_name(), invoked_name->as_C_string(), invoked_type->as_C_string());
962 }
963 }
964 return proxy_klass;
965 }
966
967 InstanceKlass* SystemDictionaryShared::retrieve_lambda_proxy_class(const RunTimeLambdaProxyClassInfo* info) {
968 InstanceKlass* proxy_klass = nullptr;
969 if (info != nullptr) {
970 InstanceKlass* curr_klass = info->proxy_klass_head();
971 InstanceKlass* prev_klass = curr_klass;
972 if (curr_klass->lambda_proxy_is_available()) {
973 while (curr_klass->next_link() != nullptr) {
974 prev_klass = curr_klass;
975 curr_klass = InstanceKlass::cast(curr_klass->next_link());
976 }
977 assert(curr_klass->is_hidden(), "must be");
978 assert(curr_klass->lambda_proxy_is_available(), "must be");
979
980 prev_klass->set_next_link(nullptr);
981 proxy_klass = curr_klass;
982 proxy_klass->clear_lambda_proxy_is_available();
983 if (log_is_enabled(Debug, cds)) {
984 ResourceMark rm;
985 log_debug(cds)("Loaded lambda proxy: " PTR_FORMAT " %s ", p2i(proxy_klass), proxy_klass->external_name());
986 }
987 }
988 }
989 return proxy_klass;
990 }
991
992 InstanceKlass* SystemDictionaryShared::get_shared_nest_host(InstanceKlass* lambda_ik) {
993 assert(!CDSConfig::is_dumping_static_archive() && CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
994 RunTimeClassInfo* record = RunTimeClassInfo::get_for(lambda_ik);
995 return record->nest_host();
996 }
997
998 InstanceKlass* SystemDictionaryShared::prepare_shared_lambda_proxy_class(InstanceKlass* lambda_ik,
999 InstanceKlass* caller_ik, TRAPS) {
1000 Handle class_loader(THREAD, caller_ik->class_loader());
1001 Handle protection_domain;
1002 PackageEntry* pkg_entry = caller_ik->package();
1003 if (caller_ik->class_loader() != nullptr) {
1004 protection_domain = CDSProtectionDomain::init_security_info(class_loader, caller_ik, pkg_entry, CHECK_NULL);
1005 }
1006
1007 InstanceKlass* shared_nest_host = get_shared_nest_host(lambda_ik);
1008 assert(shared_nest_host != nullptr, "unexpected nullptr _nest_host");
1009
1010 InstanceKlass* loaded_lambda =
1011 SystemDictionary::load_shared_lambda_proxy_class(lambda_ik, class_loader, protection_domain, pkg_entry, CHECK_NULL);
1012
1013 if (loaded_lambda == nullptr) {
1014 return nullptr;
1015 }
1016
1017 // Ensures the nest host is the same as the lambda proxy's
1018 // nest host recorded at dump time.
1019 InstanceKlass* nest_host = caller_ik->nest_host(THREAD);
1020 assert(nest_host == shared_nest_host, "mismatched nest host");
1021
1022 EventClassLoad class_load_start_event;
1023
1024 // Add to class hierarchy, and do possible deoptimizations.
1025 loaded_lambda->add_to_hierarchy(THREAD);
1026 // But, do not add to dictionary.
1027
1028 loaded_lambda->link_class(CHECK_NULL);
1029 // notify jvmti
1030 if (JvmtiExport::should_post_class_load()) {
1031 JvmtiExport::post_class_load(THREAD, loaded_lambda);
1032 }
1033 if (class_load_start_event.should_commit()) {
1034 SystemDictionary::post_class_load_event(&class_load_start_event, loaded_lambda, ClassLoaderData::class_loader_data(class_loader()));
1035 }
1036
1037 loaded_lambda->initialize(CHECK_NULL);
1038
1039 return loaded_lambda;
1040 }
1041
1042 void SystemDictionaryShared::check_verification_constraints(InstanceKlass* klass,
1043 TRAPS) {
1044 //assert(!CDSConfig::is_dumping_static_archive() && CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
1045 RunTimeClassInfo* record = RunTimeClassInfo::get_for(klass);
1046
1047 int length = record->_num_verifier_constraints;
1048 if (length > 0) {
1049 for (int i = 0; i < length; i++) {
1050 RunTimeClassInfo::RTVerifierConstraint* vc = record->verifier_constraint_at(i);
1051 Symbol* name = vc->name();
1052 Symbol* from_name = vc->from_name();
1053 char c = record->verifier_constraint_flag(i);
1054
1055 if (log_is_enabled(Trace, cds, verification)) {
1056 ResourceMark rm(THREAD);
1057 log_trace(cds, verification)("check_verification_constraint: %s: %s must be subclass of %s [0x%x]",
1058 klass->external_name(), from_name->as_klass_external_name(),
1059 name->as_klass_external_name(), c);
1060 }
1061
1062 bool from_field_is_protected = (c & SystemDictionaryShared::FROM_FIELD_IS_PROTECTED) ? true : false;
1063 bool from_is_array = (c & SystemDictionaryShared::FROM_IS_ARRAY) ? true : false;
1064 bool from_is_object = (c & SystemDictionaryShared::FROM_IS_OBJECT) ? true : false;
1065
1066 bool ok = VerificationType::resolve_and_check_assignability(klass, name,
1067 from_name, from_field_is_protected, from_is_array, from_is_object, CHECK);
1068 if (!ok) {
1069 ResourceMark rm(THREAD);
1070 stringStream ss;
1071
1072 ss.print_cr("Bad type on operand stack");
1073 ss.print_cr("Exception Details:");
1074 ss.print_cr(" Location:\n %s", klass->name()->as_C_string());
1075 ss.print_cr(" Reason:\n Type '%s' is not assignable to '%s'",
1076 from_name->as_quoted_ascii(), name->as_quoted_ascii());
1077 THROW_MSG(vmSymbols::java_lang_VerifyError(), ss.as_string());
1078 }
1079 }
1080 }
1081 }
1082
1083 static oop get_class_loader_by(char type) {
1084 if (type == (char)ClassLoader::BOOT_LOADER) {
1085 return (oop)nullptr;
1086 } else if (type == (char)ClassLoader::PLATFORM_LOADER) {
1087 return SystemDictionary::java_platform_loader();
1088 } else {
1089 assert (type == (char)ClassLoader::APP_LOADER, "Sanity");
1090 return SystemDictionary::java_system_loader();
1091 }
1092 }
1093
1094 // Record class loader constraints that are checked inside
1095 // InstanceKlass::link_class(), so that these can be checked quickly
1096 // at runtime without laying out the vtable/itables.
1097 void SystemDictionaryShared::record_linking_constraint(Symbol* name, InstanceKlass* klass,
1098 Handle loader1, Handle loader2) {
1099 // A linking constraint check is executed when:
1100 // - klass extends or implements type S
1101 // - klass overrides method S.M(...) with X.M
1102 // - If klass defines the method M, X is
1103 // the same as klass.
1104 // - If klass does not define the method M,
1105 // X must be a supertype of klass and X.M is
1106 // a default method defined by X.
1107 // - loader1 = X->class_loader()
1108 // - loader2 = S->class_loader()
1109 // - loader1 != loader2
1110 // - M's parameter(s) include an object type T
1111 // We require that
1112 // - whenever loader1 and loader2 try to
1113 // resolve the type T, they must always resolve to
1114 // the same InstanceKlass.
1115 // NOTE: type T may or may not be currently resolved in
1116 // either of these two loaders. The check itself does not
1117 // try to resolve T.
1118 oop klass_loader = klass->class_loader();
1119
1120 if (!is_system_class_loader(klass_loader) &&
1121 !is_platform_class_loader(klass_loader)) {
1122 // If klass is loaded by system/platform loaders, we can
1123 // guarantee that klass and S must be loaded by the same
1124 // respective loader between dump time and run time, and
1125 // the exact same check on (name, loader1, loader2) will
1126 // be executed. Hence, we can cache this check and execute
1127 // it at runtime without walking the vtable/itables.
1128 //
1129 // This cannot be guaranteed for classes loaded by other
1130 // loaders, so we bail.
1131 return;
1132 }
1133
1134 assert(is_builtin(klass), "must be");
1135 assert(klass_loader != nullptr, "should not be called for boot loader");
1136 assert(loader1 != loader2, "must be");
1137
1138 if (CDSConfig::is_dumping_dynamic_archive() && Thread::current()->is_VM_thread()) {
1139 // We are re-laying out the vtable/itables of the *copy* of
1140 // a class during the final stage of dynamic dumping. The
1141 // linking constraints for this class has already been recorded.
1142 return;
1143 }
1144 assert(!Thread::current()->is_VM_thread(), "must be");
1145
1146 assert(CDSConfig::is_dumping_archive(), "sanity");
1147 DumpTimeClassInfo* info = get_info(klass);
1148 info->record_linking_constraint(name, loader1, loader2);
1149 }
1150
1151 // returns true IFF there's no need to re-initialize the i/v-tables for klass for
1152 // the purpose of checking class loader constraints.
1153 bool SystemDictionaryShared::check_linking_constraints(Thread* current, InstanceKlass* klass) {
1154 //assert(!CDSConfig::is_dumping_static_archive() && CDSConfig::is_using_archive(), "called at run time with CDS enabled only");
1155 LogTarget(Info, class, loader, constraints) log;
1156 if (klass->is_shared_boot_class()) {
1157 // No class loader constraint check performed for boot classes.
1158 return true;
1159 }
1160 if (klass->is_shared_platform_class() || klass->is_shared_app_class()) {
1161 RunTimeClassInfo* info = RunTimeClassInfo::get_for(klass);
1162 assert(info != nullptr, "Sanity");
1163 if (info->_num_loader_constraints > 0) {
1164 HandleMark hm(current);
1165 for (int i = 0; i < info->_num_loader_constraints; i++) {
1166 RunTimeClassInfo::RTLoaderConstraint* lc = info->loader_constraint_at(i);
1167 Symbol* name = lc->constraint_name();
1168 Handle loader1(current, get_class_loader_by(lc->_loader_type1));
1169 Handle loader2(current, get_class_loader_by(lc->_loader_type2));
1170 if (log.is_enabled()) {
1171 ResourceMark rm(current);
1172 log.print("[CDS add loader constraint for class %s symbol %s loader[0] %s loader[1] %s",
1173 klass->external_name(), name->as_C_string(),
1174 ClassLoaderData::class_loader_data(loader1())->loader_name_and_id(),
1175 ClassLoaderData::class_loader_data(loader2())->loader_name_and_id());
1176 }
1177 if (!SystemDictionary::add_loader_constraint(name, klass, loader1, loader2)) {
1178 // Loader constraint violation has been found. The caller
1179 // will re-layout the vtable/itables to produce the correct
1180 // exception.
1181 if (log.is_enabled()) {
1182 log.print(" failed]");
1183 }
1184 return false;
1185 }
1186 if (log.is_enabled()) {
1187 log.print(" succeeded]");
1188 }
1189 }
1190 return true; // for all recorded constraints added successfully.
1191 }
1192 }
1193 if (log.is_enabled()) {
1194 ResourceMark rm(current);
1195 log.print("[CDS has not recorded loader constraint for class %s]", klass->external_name());
1196 }
1197 return false;
1198 }
1199
1200 bool SystemDictionaryShared::is_supported_invokedynamic(BootstrapInfo* bsi) {
1201 LogTarget(Debug, cds, lambda) log;
1202 if (bsi->arg_values() == nullptr || !bsi->arg_values()->is_objArray()) {
1203 if (log.is_enabled()) {
1204 LogStream log_stream(log);
1205 log.print("bsi check failed");
1206 log.print(" bsi->arg_values().not_null() %d", bsi->arg_values().not_null());
1207 if (bsi->arg_values().not_null()) {
1208 log.print(" bsi->arg_values()->is_objArray() %d", bsi->arg_values()->is_objArray());
1209 bsi->print_msg_on(&log_stream);
1210 }
1211 }
1212 return false;
1213 }
1214
1215 Handle bsm = bsi->bsm();
1216 if (bsm.is_null() || !java_lang_invoke_DirectMethodHandle::is_instance(bsm())) {
1217 if (log.is_enabled()) {
1218 log.print("bsm check failed");
1219 log.print(" bsm.is_null() %d", bsm.is_null());
1220 log.print(" java_lang_invoke_DirectMethodHandle::is_instance(bsm()) %d",
1221 java_lang_invoke_DirectMethodHandle::is_instance(bsm()));
1222 }
1223 return false;
1224 }
1225
1226 oop mn = java_lang_invoke_DirectMethodHandle::member(bsm());
1227 Method* method = java_lang_invoke_MemberName::vmtarget(mn);
1228 if (method->klass_name()->equals("java/lang/invoke/LambdaMetafactory") &&
1229 method->name()->equals("metafactory") &&
1230 method->signature()->equals("(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;"
1231 "Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;"
1232 "Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;")) {
1233 return true;
1234 } else {
1235 if (log.is_enabled()) {
1236 ResourceMark rm;
1237 log.print("method check failed");
1238 log.print(" klass_name() %s", method->klass_name()->as_C_string());
1239 log.print(" name() %s", method->name()->as_C_string());
1240 log.print(" signature() %s", method->signature()->as_C_string());
1241 }
1242 }
1243
1244 return false;
1245 }
1246
1247 class EstimateSizeForArchive : StackObj {
1248 size_t _shared_class_info_size;
1249 int _num_builtin_klasses;
1250 int _num_unregistered_klasses;
1251
1252 public:
1253 EstimateSizeForArchive() {
1254 _shared_class_info_size = 0;
1255 _num_builtin_klasses = 0;
1256 _num_unregistered_klasses = 0;
1257 }
1258
1259 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
1260 if (!info.is_excluded()) {
1261 size_t byte_size = info.runtime_info_bytesize();
1262 _shared_class_info_size += align_up(byte_size, SharedSpaceObjectAlignment);
1263 }
1264 }
1265
1266 size_t total() {
1267 return _shared_class_info_size;
1268 }
1269 };
1270
1271 size_t SystemDictionaryShared::estimate_size_for_archive() {
1272 EstimateSizeForArchive est;
1273 _dumptime_table->iterate_all_live_classes(&est);
1274 size_t total_size = est.total() +
1275 CompactHashtableWriter::estimate_size(_dumptime_table->count_of(true)) +
1276 CompactHashtableWriter::estimate_size(_dumptime_table->count_of(false));
1277
1278 size_t bytesize = align_up(sizeof(RunTimeLambdaProxyClassInfo), SharedSpaceObjectAlignment);
1279 total_size +=
1280 (bytesize * _dumptime_lambda_proxy_class_dictionary->_count) +
1281 CompactHashtableWriter::estimate_size(_dumptime_lambda_proxy_class_dictionary->_count);
1282
1283 size_t method_info_byte_size = align_up(sizeof(RunTimeMethodDataInfo), SharedSpaceObjectAlignment);
1284 total_size +=
1285 (method_info_byte_size * _dumptime_method_info_dictionary->_count) +
1286 CompactHashtableWriter::estimate_size(_dumptime_method_info_dictionary->_count);
1287
1288 return total_size;
1289 }
1290
1291 unsigned int SystemDictionaryShared::hash_for_shared_dictionary(address ptr) {
1292 if (ArchiveBuilder::is_active() && ArchiveBuilder::current()->is_in_buffer_space(ptr)) {
1293 uintx offset = ArchiveBuilder::current()->any_to_offset(ptr);
1294 unsigned int hash = primitive_hash<uintx>(offset);
1295 DEBUG_ONLY({
1296 if (MetaspaceObj::is_shared((const MetaspaceObj*)ptr)) {
1297 assert(hash == SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr), "must be");
1298 }
1299 });
1300 return hash;
1301 } else {
1302 return SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr);
1303 }
1304 }
1305
1306 class CopyLambdaProxyClassInfoToArchive : StackObj {
1307 CompactHashtableWriter* _writer;
1308 ArchiveBuilder* _builder;
1309 public:
1310 CopyLambdaProxyClassInfoToArchive(CompactHashtableWriter* writer)
1311 : _writer(writer), _builder(ArchiveBuilder::current()) {}
1312 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
1313 // In static dump, info._proxy_klasses->at(0) is already relocated to point to the archived class
1314 // (not the original class).
1315 //
1316 // The following check has been moved to SystemDictionaryShared::check_excluded_classes(), which
1317 // happens before the classes are copied.
1318 //
1319 // if (SystemDictionaryShared::is_excluded_class(info._proxy_klasses->at(0))) {
1320 // return true;
1321 //}
1322 ResourceMark rm;
1323 log_info(cds,dynamic)("Archiving hidden %s", info._proxy_klasses->at(0)->external_name());
1324 size_t byte_size = sizeof(RunTimeLambdaProxyClassInfo);
1325 RunTimeLambdaProxyClassInfo* runtime_info =
1326 (RunTimeLambdaProxyClassInfo*)ArchiveBuilder::ro_region_alloc(byte_size);
1327 runtime_info->init(key, info);
1328 unsigned int hash = runtime_info->hash();
1329 u4 delta = _builder->any_to_offset_u4((void*)runtime_info);
1330 _writer->add(hash, delta);
1331 return true;
1332 }
1333 };
1334
1335 class AdjustLambdaProxyClassInfo : StackObj {
1336 public:
1337 AdjustLambdaProxyClassInfo() {}
1338 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
1339 int len = info._proxy_klasses->length();
1340 InstanceKlass* last_buff_k = nullptr;
1341
1342 for (int i = len - 1; i >= 0; i--) {
1343 InstanceKlass* orig_k = info._proxy_klasses->at(i);
1344 InstanceKlass* buff_k = ArchiveBuilder::current()->get_buffered_addr(orig_k);
1345 assert(ArchiveBuilder::current()->is_in_buffer_space(buff_k), "must be");
1346 buff_k->set_lambda_proxy_is_available();
1347 buff_k->set_next_link(last_buff_k);
1348 if (last_buff_k != nullptr) {
1349 ArchivePtrMarker::mark_pointer(buff_k->next_link_addr());
1350 }
1351 last_buff_k = buff_k;
1352 }
1353
1354 return true;
1355 }
1356 };
1357
1358 class CopySharedClassInfoToArchive : StackObj {
1359 CompactHashtableWriter* _writer;
1360 bool _is_builtin;
1361 ArchiveBuilder *_builder;
1362 public:
1363 CopySharedClassInfoToArchive(CompactHashtableWriter* writer,
1364 bool is_builtin)
1365 : _writer(writer), _is_builtin(is_builtin), _builder(ArchiveBuilder::current()) {}
1366
1367 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
1368 if (!info.is_excluded() && info.is_builtin() == _is_builtin) {
1369 size_t byte_size = info.runtime_info_bytesize();
1370 RunTimeClassInfo* record;
1371 record = (RunTimeClassInfo*)ArchiveBuilder::ro_region_alloc(byte_size);
1372 record->init(info);
1373
1374 unsigned int hash;
1375 Symbol* name = info._klass->name();
1376 name = ArchiveBuilder::current()->get_buffered_addr(name);
1377 hash = SystemDictionaryShared::hash_for_shared_dictionary((address)name);
1378 u4 delta = _builder->buffer_to_offset_u4((address)record);
1379 if (_is_builtin && info._klass->is_hidden()) {
1380 // skip
1381 } else {
1382 _writer->add(hash, delta);
1383 }
1384 if (log_is_enabled(Trace, cds, hashtables)) {
1385 ResourceMark rm;
1386 log_trace(cds,hashtables)("%s dictionary: %s", (_is_builtin ? "builtin" : "unregistered"), info._klass->external_name());
1387 }
1388
1389 // Save this for quick runtime lookup of InstanceKlass* -> RunTimeClassInfo*
1390 InstanceKlass* buffered_klass = ArchiveBuilder::current()->get_buffered_addr(info._klass);
1391 RunTimeClassInfo::set_for(buffered_klass, record);
1392 }
1393 }
1394 };
1395
1396 void SystemDictionaryShared::write_lambda_proxy_class_dictionary(LambdaProxyClassDictionary *dictionary) {
1397 CompactHashtableStats stats;
1398 dictionary->reset();
1399 CompactHashtableWriter writer(_dumptime_lambda_proxy_class_dictionary->_count, &stats);
1400 CopyLambdaProxyClassInfoToArchive copy(&writer);
1401 _dumptime_lambda_proxy_class_dictionary->iterate(©);
1402 writer.dump(dictionary, "lambda proxy class dictionary");
1403 }
1404
1405 class CopyMethodDataInfoToArchive : StackObj {
1406 CompactHashtableWriter* _writer;
1407 ArchiveBuilder* _builder;
1408 public:
1409 CopyMethodDataInfoToArchive(CompactHashtableWriter* writer)
1410 : _writer(writer), _builder(ArchiveBuilder::current()) {}
1411
1412 bool do_entry(MethodDataKey& key, DumpTimeMethodDataInfo& info) {
1413 Method* holder = key.method();
1414 log_info(cds,dynamic)("Archiving method info for %s", holder->external_name());
1415
1416 size_t byte_size = sizeof(RunTimeMethodDataInfo);
1417 RunTimeMethodDataInfo* record = (RunTimeMethodDataInfo*)ArchiveBuilder::ro_region_alloc(byte_size);
1418
1419 DumpTimeMethodDataInfo data(info.method_data(), info.method_counters());
1420 record->init(key, data);
1421
1422 uint hash = SystemDictionaryShared::hash_for_shared_dictionary((address)holder);
1423 u4 delta = _builder->buffer_to_offset_u4((address)record);
1424 _writer->add(hash, delta);
1425
1426 return true;
1427 }
1428 };
1429
1430 void SystemDictionaryShared::write_method_info_dictionary(MethodDataInfoDictionary* dictionary) {
1431 CompactHashtableStats stats;
1432 dictionary->reset();
1433 CompactHashtableWriter writer(_dumptime_method_info_dictionary->_count, &stats);
1434 CopyMethodDataInfoToArchive copy(&writer);
1435 _dumptime_method_info_dictionary->iterate(©);
1436 writer.dump(dictionary, "method info dictionary");
1437 }
1438
1439 void SystemDictionaryShared::write_dictionary(RunTimeSharedDictionary* dictionary,
1440 bool is_builtin) {
1441 CompactHashtableStats stats;
1442 dictionary->reset();
1443 CompactHashtableWriter writer(_dumptime_table->count_of(is_builtin), &stats);
1444 CopySharedClassInfoToArchive copy(&writer, is_builtin);
1445 assert_lock_strong(DumpTimeTable_lock);
1446 _dumptime_table->iterate_all_live_classes(©);
1447 writer.dump(dictionary, is_builtin ? "builtin dictionary" : "unregistered dictionary");
1448 }
1449
1450 void SystemDictionaryShared::write_to_archive(bool is_static_archive) {
1451 ArchiveInfo* archive = get_archive(is_static_archive);
1452
1453 write_dictionary(&archive->_builtin_dictionary, true);
1454 write_dictionary(&archive->_unregistered_dictionary, false);
1455
1456 write_lambda_proxy_class_dictionary(&archive->_lambda_proxy_class_dictionary);
1457
1458 write_method_info_dictionary(&archive->_method_info_dictionary);
1459 }
1460
1461 void SystemDictionaryShared::adjust_lambda_proxy_class_dictionary() {
1462 AdjustLambdaProxyClassInfo adjuster;
1463 _dumptime_lambda_proxy_class_dictionary->iterate(&adjuster);
1464 }
1465
1466 class AdjustMethodInfo : StackObj {
1467 public:
1468 AdjustMethodInfo() {}
1469 bool do_entry(MethodDataKey& key, DumpTimeMethodDataInfo& info) {
1470 // TODO: is it possible for the data to become stale/invalid?
1471 MethodData* md = info.method_data();
1472 MethodCounters* mc = info.method_counters();
1473 if (md != nullptr) {
1474 md = ArchiveBuilder::current()->get_buffered_addr(md);
1475 }
1476 if (mc != nullptr) {
1477 mc = ArchiveBuilder::current()->get_buffered_addr(mc);
1478 }
1479 assert(ArchiveBuilder::current()->is_in_buffer_space(md) || md == nullptr, "must be");
1480 assert(ArchiveBuilder::current()->is_in_buffer_space(mc) || mc == nullptr, "must be");
1481 if (md != nullptr) {
1482 md->remove_unshareable_info();
1483 }
1484 if (mc != nullptr) {
1485 mc->remove_unshareable_info();
1486 }
1487 return true;
1488 }
1489 };
1490
1491 void SystemDictionaryShared::adjust_method_info_dictionary() {
1492 AdjustMethodInfo adjuster;
1493 _dumptime_method_info_dictionary->iterate(&adjuster);
1494 }
1495
1496 void SystemDictionaryShared::serialize_dictionary_headers(SerializeClosure* soc,
1497 bool is_static_archive) {
1498 ArchiveInfo* archive = get_archive(is_static_archive);
1499
1500 archive->_builtin_dictionary.serialize_header(soc);
1501 archive->_unregistered_dictionary.serialize_header(soc);
1502 archive->_lambda_proxy_class_dictionary.serialize_header(soc);
1503 archive->_method_info_dictionary.serialize_header(soc);
1504 }
1505
1506 void SystemDictionaryShared::serialize_vm_classes(SerializeClosure* soc) {
1507 for (auto id : EnumRange<vmClassID>{}) {
1508 soc->do_ptr(vmClasses::klass_addr_at(id));
1509 }
1510 soc->do_ptr((void**)&_archived_lambda_form_classes);
1511 soc->do_ptr((void**)&_archived_lambda_proxy_classes_boot);
1512 soc->do_ptr((void**)&_archived_lambda_proxy_classes_boot2);
1513 soc->do_ptr((void**)&_archived_lambda_proxy_classes_platform);
1514 soc->do_ptr((void**)&_archived_lambda_proxy_classes_app);
1515 }
1516
1517 const RunTimeClassInfo*
1518 SystemDictionaryShared::find_record(RunTimeSharedDictionary* static_dict, RunTimeSharedDictionary* dynamic_dict, Symbol* name) {
1519 if (!CDSConfig::is_using_archive() || !name->is_shared()) {
1520 // The names of all shared classes must also be a shared Symbol.
1521 return nullptr;
1522 }
1523
1524 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(name);
1525 const RunTimeClassInfo* record = nullptr;
1526 if (DynamicArchive::is_mapped()) {
1527 // Use the regenerated holder classes in the dynamic archive as they
1528 // have more methods than those in the base archive.
1529 if (LambdaFormInvokers::may_be_regenerated_class(name)) {
1530 record = dynamic_dict->lookup(name, hash, 0);
1531 if (record != nullptr) {
1532 return record;
1533 }
1534 }
1535 }
1536
1537 if (!MetaspaceShared::is_shared_dynamic(name)) {
1538 // The names of all shared classes in the static dict must also be in the
1539 // static archive
1540 record = static_dict->lookup(name, hash, 0);
1541 }
1542
1543 if (record == nullptr && DynamicArchive::is_mapped()) {
1544 record = dynamic_dict->lookup(name, hash, 0);
1545 }
1546
1547 return record;
1548 }
1549
1550 InstanceKlass* SystemDictionaryShared::find_builtin_class(Symbol* name) {
1551 const RunTimeClassInfo* record = find_record(&_static_archive._builtin_dictionary,
1552 &_dynamic_archive._builtin_dictionary,
1553 name);
1554 if (record != nullptr) {
1555 assert(!record->_klass->is_hidden(), "hidden class cannot be looked up by name");
1556 assert(check_alignment(record->_klass), "Address not aligned");
1557 // We did not save the classfile data of the generated LambdaForm invoker classes,
1558 // so we cannot support CLFH for such classes.
1559 if (record->_klass->is_generated_shared_class() && JvmtiExport::should_post_class_file_load_hook()) {
1560 return nullptr;
1561 }
1562 return record->_klass;
1563 } else {
1564 return nullptr;
1565 }
1566 }
1567
1568 void SystemDictionaryShared::update_shared_entry(InstanceKlass* k, int id) {
1569 assert(CDSConfig::is_dumping_static_archive(), "class ID is used only for static dump (from classlist)");
1570 DumpTimeClassInfo* info = get_info(k);
1571 info->_id = id;
1572 }
1573
1574 const char* SystemDictionaryShared::class_loader_name_for_shared(Klass* k) {
1575 assert(k != nullptr, "Sanity");
1576 assert(k->is_shared(), "Must be");
1577 assert(k->is_instance_klass(), "Must be");
1578 InstanceKlass* ik = InstanceKlass::cast(k);
1579 if (ik->is_shared_boot_class()) {
1580 return "boot_loader";
1581 } else if (ik->is_shared_platform_class()) {
1582 return "platform_loader";
1583 } else if (ik->is_shared_app_class()) {
1584 return "app_loader";
1585 } else if (ik->is_shared_unregistered_class()) {
1586 return "unregistered_loader";
1587 } else {
1588 return "unknown loader";
1589 }
1590 }
1591
1592 class SharedDictionaryPrinter : StackObj {
1593 outputStream* _st;
1594 int _index;
1595 public:
1596 SharedDictionaryPrinter(outputStream* st) : _st(st), _index(0) {}
1597
1598 void do_value(const RunTimeClassInfo* record) {
1599 ResourceMark rm;
1600 _st->print_cr("%4d: %s %s", _index++, record->_klass->external_name(),
1601 SystemDictionaryShared::class_loader_name_for_shared(record->_klass));
1602 if (record->_klass->array_klasses() != nullptr) {
1603 record->_klass->array_klasses()->cds_print_value_on(_st);
1604 _st->cr();
1605 }
1606 }
1607 int index() const { return _index; }
1608 };
1609
1610 class SharedLambdaDictionaryPrinter : StackObj {
1611 outputStream* _st;
1612 int _index;
1613 public:
1614 SharedLambdaDictionaryPrinter(outputStream* st, int idx) : _st(st), _index(idx) {}
1615
1616 void do_value(const RunTimeLambdaProxyClassInfo* record) {
1617 if (record->proxy_klass_head()->lambda_proxy_is_available()) {
1618 ResourceMark rm;
1619 Klass* k = record->proxy_klass_head();
1620 while (k != nullptr) {
1621 _st->print_cr("%4d: %s %s", _index++, k->external_name(),
1622 SystemDictionaryShared::class_loader_name_for_shared(k));
1623 k = k->next_link();
1624 }
1625 }
1626 }
1627 };
1628
1629 class SharedMethodInfoDictionaryPrinter : StackObj {
1630 outputStream* _st;
1631 int _index;
1632
1633 private:
1634 static const char* tag(void* p) {
1635 if (p == nullptr) {
1636 return " ";
1637 } else if (MetaspaceShared::is_shared_dynamic(p)) {
1638 return "<D>";
1639 } else if (MetaspaceShared::is_in_shared_metaspace(p)) {
1640 return "<S>";
1641 } else {
1642 return "???";
1643 }
1644 }
1645 public:
1646 SharedMethodInfoDictionaryPrinter(outputStream* st) : _st(st), _index(0) {}
1647
1648 void do_value(const RunTimeMethodDataInfo* record) {
1649 ResourceMark rm;
1650 Method* m = record->method();
1651 MethodCounters* mc = record->method_counters();
1652 MethodData* md = record->method_data();
1653
1654 _st->print_cr("%4d: %s" PTR_FORMAT " %s" PTR_FORMAT " %s" PTR_FORMAT " %s", _index++,
1655 tag(m), p2i(m),
1656 tag(mc), p2i(mc),
1657 tag(md), p2i(md),
1658 m->external_name());
1659 if (Verbose) {
1660 if (mc != nullptr) {
1661 mc->print_on(_st);
1662 }
1663 if (md != nullptr) {
1664 md->print_on(_st);
1665 }
1666 _st->cr();
1667 }
1668 }
1669 };
1670
1671 void SystemDictionaryShared::ArchiveInfo::print_on(const char* prefix,
1672 outputStream* st) {
1673 st->print_cr("%sShared Dictionary", prefix);
1674 SharedDictionaryPrinter p(st);
1675 st->print_cr("%sShared Builtin Dictionary", prefix);
1676 _builtin_dictionary.iterate(&p);
1677 st->print_cr("%sShared Unregistered Dictionary", prefix);
1678 _unregistered_dictionary.iterate(&p);
1679 if (!_lambda_proxy_class_dictionary.empty()) {
1680 st->print_cr("%sShared Lambda Dictionary", prefix);
1681 SharedLambdaDictionaryPrinter ldp(st, p.index());
1682 _lambda_proxy_class_dictionary.iterate(&ldp);
1683 }
1684 if (!_method_info_dictionary.empty()) {
1685 st->print_cr("%sShared MethodData Dictionary", prefix);
1686 SharedMethodInfoDictionaryPrinter mdp(st);
1687 _method_info_dictionary.iterate(&mdp);
1688 }
1689 }
1690
1691 void SystemDictionaryShared::ArchiveInfo::print_table_statistics(const char* prefix,
1692 outputStream* st) {
1693 st->print_cr("%sArchve Statistics", prefix);
1694 _builtin_dictionary.print_table_statistics(st, "Builtin Shared Dictionary");
1695 _unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary");
1696 _lambda_proxy_class_dictionary.print_table_statistics(st, "Lambda Shared Dictionary");
1697 _method_info_dictionary.print_table_statistics(st, "MethodData Dictionary");
1698 }
1699
1700 void SystemDictionaryShared::print_shared_archive(outputStream* st, bool is_static) {
1701 if (CDSConfig::is_using_archive()) {
1702 if (is_static) {
1703 _static_archive.print_on("", st);
1704 } else {
1705 if (DynamicArchive::is_mapped()) {
1706 _dynamic_archive.print_on("Dynamic ", st);
1707 }
1708 }
1709 }
1710 }
1711
1712 void SystemDictionaryShared::print_on(outputStream* st) {
1713 print_shared_archive(st, true);
1714 print_shared_archive(st, false);
1715 }
1716
1717 void SystemDictionaryShared::print_table_statistics(outputStream* st) {
1718 if (CDSConfig::is_using_archive()) {
1719 _static_archive.print_table_statistics("Static ", st);
1720 if (DynamicArchive::is_mapped()) {
1721 _dynamic_archive.print_table_statistics("Dynamic ", st);
1722 }
1723 }
1724 }
1725
1726 bool SystemDictionaryShared::is_dumptime_table_empty() {
1727 assert_lock_strong(DumpTimeTable_lock);
1728 _dumptime_table->update_counts();
1729 if (_dumptime_table->count_of(true) == 0 && _dumptime_table->count_of(false) == 0){
1730 return true;
1731 }
1732 return false;
1733 }
1734
1735 class CleanupDumpTimeLambdaProxyClassTable: StackObj {
1736 public:
1737 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
1738 assert_lock_strong(DumpTimeTable_lock);
1739 InstanceKlass* caller_ik = key.caller_ik();
1740 InstanceKlass* nest_host = caller_ik->nest_host_not_null();
1741
1742 // If the caller class and/or nest_host are excluded, the associated lambda proxy
1743 // must also be excluded.
1744 bool always_exclude = SystemDictionaryShared::check_for_exclusion(caller_ik, nullptr) ||
1745 SystemDictionaryShared::check_for_exclusion(nest_host, nullptr);
1746
1747 for (int i = info._proxy_klasses->length() - 1; i >= 0; i--) {
1748 InstanceKlass* ik = info._proxy_klasses->at(i);
1749 if (always_exclude || SystemDictionaryShared::check_for_exclusion(ik, nullptr)) {
1750 SystemDictionaryShared::reset_registered_lambda_proxy_class(ik);
1751 info._proxy_klasses->remove_at(i);
1752 }
1753 }
1754 return info._proxy_klasses->length() == 0 ? true /* delete the node*/ : false;
1755 }
1756 };
1757
1758 void SystemDictionaryShared::cleanup_lambda_proxy_class_dictionary() {
1759 assert_lock_strong(DumpTimeTable_lock);
1760 CleanupDumpTimeLambdaProxyClassTable cleanup_proxy_classes;
1761 _dumptime_lambda_proxy_class_dictionary->unlink(&cleanup_proxy_classes);
1762 }
1763
1764 class CleanupDumpTimeMethodInfoTable : StackObj {
1765 public:
1766 bool do_entry(MethodDataKey& key, DumpTimeMethodDataInfo& info) {
1767 assert_lock_strong(DumpTimeTable_lock);
1768 assert(MetaspaceShared::is_in_shared_metaspace(key.method()), "");
1769 InstanceKlass* holder = key.method()->method_holder();
1770 bool is_excluded = SystemDictionaryShared::check_for_exclusion(holder, nullptr);
1771 return is_excluded;
1772 }
1773 };
1774
1775 void SystemDictionaryShared::cleanup_method_info_dictionary() {
1776 assert_lock_strong(DumpTimeTable_lock);
1777
1778 CleanupDumpTimeMethodInfoTable cleanup_method_info;
1779 _dumptime_method_info_dictionary->unlink(&cleanup_method_info);
1780 }
1781
1782 void SystemDictionaryShared::create_loader_positive_lookup_cache(TRAPS) {
1783 GrowableArray<InstanceKlass*> shared_classes_list;
1784 {
1785 // With static dumping, we have only a single Java thread (see JVM_StartThread) so
1786 // no no other threads should be loading classes. Otherwise, the code below may miss some
1787 // classes that are loaded concurrently.
1788 assert(CDSConfig::is_dumping_static_archive(), "no other threads should be loading classes");
1789
1790 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
1791 _dumptime_table->iterate_all_classes_in_builtin_loaders([&](InstanceKlass* k, DumpTimeClassInfo& info) {
1792 if (!k->is_hidden() && !check_for_exclusion(k, &info)) {
1793 shared_classes_list.append(k);
1794 }
1795 }
1796 );
1797 }
1798
1799 InstanceKlass* ik = vmClasses::Class_klass();
1800 objArrayOop r = oopFactory::new_objArray(ik, shared_classes_list.length(), CHECK);
1801 objArrayHandle array_h(THREAD, r);
1802
1803 for (int i = 0; i < shared_classes_list.length(); i++) {
1804 oop mirror = shared_classes_list.at(i)->java_mirror();
1805 Handle mirror_h(THREAD, mirror);
1806 array_h->obj_at_put(i, mirror_h());
1807 }
1808
1809 TempNewSymbol method = SymbolTable::new_symbol("generatePositiveLookupCache");
1810 TempNewSymbol signature = SymbolTable::new_symbol("([Ljava/lang/Class;)V");
1811
1812 JavaCallArguments args(Handle(THREAD, SystemDictionary::java_system_loader()));
1813 args.push_oop(array_h);
1814 JavaValue result(T_VOID);
1815 JavaCalls::call_virtual(&result,
1816 vmClasses::jdk_internal_loader_ClassLoaders_AppClassLoader_klass(),
1817 method,
1818 signature,
1819 &args,
1820 CHECK);
1821
1822 if (HAS_PENDING_EXCEPTION) {
1823 Handle exc_handle(THREAD, PENDING_EXCEPTION);
1824 CLEAR_PENDING_EXCEPTION;
1825 ResourceMark rm(THREAD);
1826
1827 log_warning(cds)("Exception during AppClassLoader::generatePositiveLookupCache() call");
1828 LogStreamHandle(Debug, cds) log;
1829 if (log.is_enabled()) {
1830 java_lang_Throwable::print_stack_trace(exc_handle, &log);
1831 }
1832 return;
1833 }
1834 }