1 /* 2 * Copyright (c) 2014, 2023, 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/classListParser.hpp" 30 #include "cds/classListWriter.hpp" 31 #include "cds/dynamicArchive.hpp" 32 #include "cds/filemap.hpp" 33 #include "cds/cdsProtectionDomain.hpp" 34 #include "cds/dumpTimeClassInfo.inline.hpp" 35 #include "cds/metaspaceShared.hpp" 36 #include "cds/runTimeClassInfo.hpp" 37 #include "classfile/classFileStream.hpp" 38 #include "classfile/classLoader.hpp" 39 #include "classfile/classLoaderData.inline.hpp" 40 #include "classfile/classLoaderDataGraph.hpp" 41 #include "classfile/classLoaderExt.hpp" 42 #include "classfile/dictionary.hpp" 43 #include "classfile/javaClasses.hpp" 44 #include "classfile/javaClasses.inline.hpp" 45 #include "classfile/symbolTable.hpp" 46 #include "classfile/systemDictionary.hpp" 47 #include "classfile/systemDictionaryShared.hpp" 48 #include "classfile/verificationType.hpp" 49 #include "classfile/vmClasses.hpp" 50 #include "classfile/vmSymbols.hpp" 51 #include "interpreter/bootstrapInfo.hpp" 52 #include "jfr/jfrEvents.hpp" 53 #include "logging/log.hpp" 54 #include "logging/logStream.hpp" 55 #include "memory/allocation.hpp" 56 #include "memory/metadataFactory.hpp" 57 #include "memory/metaspaceClosure.hpp" 58 #include "memory/oopFactory.hpp" 59 #include "memory/resourceArea.hpp" 60 #include "memory/universe.hpp" 61 #include "oops/instanceKlass.hpp" 62 #include "oops/klass.inline.hpp" 63 #include "oops/objArrayKlass.hpp" 64 #include "oops/objArrayOop.inline.hpp" 65 #include "oops/oop.inline.hpp" 66 #include "oops/oopHandle.inline.hpp" 67 #include "oops/typeArrayOop.inline.hpp" 68 #include "runtime/arguments.hpp" 69 #include "runtime/handles.inline.hpp" 70 #include "runtime/java.hpp" 71 #include "runtime/javaCalls.hpp" 72 #include "runtime/mutexLocker.hpp" 73 #include "utilities/resourceHash.hpp" 74 #include "utilities/stringUtils.hpp" 75 76 SystemDictionaryShared::ArchiveInfo SystemDictionaryShared::_static_archive; 77 SystemDictionaryShared::ArchiveInfo SystemDictionaryShared::_dynamic_archive; 78 79 DumpTimeSharedClassTable* SystemDictionaryShared::_dumptime_table = nullptr; 80 DumpTimeSharedClassTable* SystemDictionaryShared::_cloned_dumptime_table = nullptr; 81 DumpTimeLambdaProxyClassDictionary* SystemDictionaryShared::_dumptime_lambda_proxy_class_dictionary = nullptr; 82 DumpTimeLambdaProxyClassDictionary* SystemDictionaryShared::_cloned_dumptime_lambda_proxy_class_dictionary = nullptr; 83 84 // Used by NoClassLoadingMark 85 DEBUG_ONLY(bool SystemDictionaryShared::_class_loading_may_happen = true;) 86 87 InstanceKlass* SystemDictionaryShared::load_shared_class_for_builtin_loader( 88 Symbol* class_name, Handle class_loader, TRAPS) { 89 assert(UseSharedSpaces, "must be"); 90 InstanceKlass* ik = find_builtin_class(class_name); 91 92 if (ik != nullptr && !ik->shared_loading_failed()) { 93 if ((SystemDictionary::is_system_class_loader(class_loader()) && ik->is_shared_app_class()) || 94 (SystemDictionary::is_platform_class_loader(class_loader()) && ik->is_shared_platform_class())) { 95 SharedClassLoadingMark slm(THREAD, ik); 96 PackageEntry* pkg_entry = CDSProtectionDomain::get_package_entry_from_class(ik, class_loader); 97 Handle protection_domain = 98 CDSProtectionDomain::init_security_info(class_loader, ik, pkg_entry, CHECK_NULL); 99 return load_shared_class(ik, class_loader, protection_domain, nullptr, pkg_entry, THREAD); 100 } 101 } 102 return nullptr; 103 } 104 105 // This function is called for loading only UNREGISTERED classes 106 InstanceKlass* SystemDictionaryShared::lookup_from_stream(Symbol* class_name, 107 Handle class_loader, 108 Handle protection_domain, 109 const ClassFileStream* cfs, 110 TRAPS) { 111 if (!UseSharedSpaces) { 112 return nullptr; 113 } 114 if (class_name == nullptr) { // don't do this for hidden classes 115 return nullptr; 116 } 117 if (class_loader.is_null() || 118 SystemDictionary::is_system_class_loader(class_loader()) || 119 SystemDictionary::is_platform_class_loader(class_loader())) { 120 // Do nothing for the BUILTIN loaders. 121 return nullptr; 122 } 123 124 const RunTimeClassInfo* record = find_record(&_static_archive._unregistered_dictionary, 125 &_dynamic_archive._unregistered_dictionary, 126 class_name); 127 if (record == nullptr) { 128 return nullptr; 129 } 130 131 int clsfile_size = cfs->length(); 132 int clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length()); 133 134 if (!record->matches(clsfile_size, clsfile_crc32)) { 135 return nullptr; 136 } 137 138 return acquire_class_for_current_thread(record->_klass, class_loader, 139 protection_domain, cfs, 140 THREAD); 141 } 142 143 InstanceKlass* SystemDictionaryShared::acquire_class_for_current_thread( 144 InstanceKlass *ik, 145 Handle class_loader, 146 Handle protection_domain, 147 const ClassFileStream *cfs, 148 TRAPS) { 149 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader()); 150 151 { 152 MutexLocker mu(THREAD, SharedDictionary_lock); 153 if (ik->class_loader_data() != nullptr) { 154 // ik is already loaded (by this loader or by a different loader) 155 // or ik is being loaded by a different thread (by this loader or by a different loader) 156 return nullptr; 157 } 158 159 // No other thread has acquired this yet, so give it to *this thread* 160 ik->set_class_loader_data(loader_data); 161 } 162 163 // No longer holding SharedDictionary_lock 164 // No need to lock, as <ik> can be held only by a single thread. 165 loader_data->add_class(ik); 166 167 // Get the package entry. 168 PackageEntry* pkg_entry = CDSProtectionDomain::get_package_entry_from_class(ik, class_loader); 169 170 // Load and check super/interfaces, restore unshareable info 171 InstanceKlass* shared_klass = load_shared_class(ik, class_loader, protection_domain, 172 cfs, pkg_entry, THREAD); 173 if (shared_klass == nullptr || HAS_PENDING_EXCEPTION) { 174 // TODO: clean up <ik> so it can be used again 175 return nullptr; 176 } 177 178 return shared_klass; 179 } 180 181 // Guaranteed to return non-null value for non-shared classes. 182 // k must not be a shared class. 183 DumpTimeClassInfo* SystemDictionaryShared::get_info(InstanceKlass* k) { 184 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag); 185 assert(!k->is_shared(), "sanity"); 186 return get_info_locked(k); 187 } 188 189 DumpTimeClassInfo* SystemDictionaryShared::get_info_locked(InstanceKlass* k) { 190 assert_lock_strong(DumpTimeTable_lock); 191 assert(!k->is_shared(), "sanity"); 192 DumpTimeClassInfo* info = _dumptime_table->get_info(k); 193 assert(info != nullptr, "must be"); 194 return info; 195 } 196 197 bool SystemDictionaryShared::check_for_exclusion(InstanceKlass* k, DumpTimeClassInfo* info) { 198 if (MetaspaceShared::is_in_shared_metaspace(k)) { 199 // We have reached a super type that's already in the base archive. Treat it 200 // as "not excluded". 201 assert(DynamicDumpSharedSpaces, "must be"); 202 return false; 203 } 204 205 if (info == nullptr) { 206 info = _dumptime_table->get(k); 207 assert(info != nullptr, "supertypes of any classes in _dumptime_table must either be shared, or must also be in _dumptime_table"); 208 } 209 210 if (!info->has_checked_exclusion()) { 211 if (check_for_exclusion_impl(k)) { 212 info->set_excluded(); 213 } 214 info->set_has_checked_exclusion(); 215 } 216 217 return info->is_excluded(); 218 } 219 220 // Returns true so the caller can do: return warn_excluded("....."); 221 bool SystemDictionaryShared::warn_excluded(InstanceKlass* k, const char* reason) { 222 ResourceMark rm; 223 log_warning(cds)("Skipping %s: %s", k->name()->as_C_string(), reason); 224 return true; 225 } 226 227 bool SystemDictionaryShared::is_jfr_event_class(InstanceKlass *k) { 228 while (k) { 229 if (k->name()->equals("jdk/internal/event/Event")) { 230 return true; 231 } 232 k = k->java_super(); 233 } 234 return false; 235 } 236 237 bool SystemDictionaryShared::is_registered_lambda_proxy_class(InstanceKlass* ik) { 238 DumpTimeClassInfo* info = _dumptime_table->get(ik); 239 return (info != nullptr) ? info->_is_archived_lambda_proxy : false; 240 } 241 242 void SystemDictionaryShared::reset_registered_lambda_proxy_class(InstanceKlass* ik) { 243 DumpTimeClassInfo* info = _dumptime_table->get(ik); 244 if (info != nullptr) { 245 info->_is_archived_lambda_proxy = false; 246 info->set_excluded(); 247 } 248 } 249 250 bool SystemDictionaryShared::is_early_klass(InstanceKlass* ik) { 251 DumpTimeClassInfo* info = _dumptime_table->get(ik); 252 return (info != nullptr) ? info->is_early_klass() : false; 253 } 254 255 bool SystemDictionaryShared::is_hidden_lambda_proxy(InstanceKlass* ik) { 256 assert(ik->is_shared(), "applicable to only a shared class"); 257 if (ik->is_hidden()) { 258 return true; 259 } else { 260 return false; 261 } 262 } 263 264 bool SystemDictionaryShared::check_for_exclusion_impl(InstanceKlass* k) { 265 if (k->is_in_error_state()) { 266 return warn_excluded(k, "In error state"); 267 } 268 if (k->is_scratch_class()) { 269 return warn_excluded(k, "A scratch class"); 270 } 271 if (!k->is_loaded()) { 272 return warn_excluded(k, "Not in loaded state"); 273 } 274 if (has_been_redefined(k)) { 275 return warn_excluded(k, "Has been redefined"); 276 } 277 if (!k->is_hidden() && k->shared_classpath_index() < 0 && is_builtin(k)) { 278 // These are classes loaded from unsupported locations (such as those loaded by JVMTI native 279 // agent during dump time). 280 return warn_excluded(k, "Unsupported location"); 281 } 282 if (k->signers() != nullptr) { 283 // We cannot include signed classes in the archive because the certificates 284 // used during dump time may be different than those used during 285 // runtime (due to expiration, etc). 286 return warn_excluded(k, "Signed JAR"); 287 } 288 if (is_jfr_event_class(k)) { 289 // We cannot include JFR event classes because they need runtime-specific 290 // instrumentation in order to work with -XX:FlightRecorderOptions:retransform=false. 291 // There are only a small number of these classes, so it's not worthwhile to 292 // support them and make CDS more complicated. 293 return warn_excluded(k, "JFR event class"); 294 } 295 296 if (!k->is_linked()) { 297 if (has_class_failed_verification(k)) { 298 return warn_excluded(k, "Failed verification"); 299 } 300 } else { 301 if (!k->can_be_verified_at_dumptime()) { 302 // We have an old class that has been linked (e.g., it's been executed during 303 // dump time). This class has been verified using the old verifier, which 304 // doesn't save the verification constraints, so check_verification_constraints() 305 // won't work at runtime. 306 // As a result, we cannot store this class. It must be loaded and fully verified 307 // at runtime. 308 return warn_excluded(k, "Old class has been linked"); 309 } 310 } 311 312 if (k->is_hidden() && !is_registered_lambda_proxy_class(k)) { 313 ResourceMark rm; 314 log_debug(cds)("Skipping %s: Hidden class", k->name()->as_C_string()); 315 return true; 316 } 317 318 InstanceKlass* super = k->java_super(); 319 if (super != nullptr && check_for_exclusion(super, nullptr)) { 320 ResourceMark rm; 321 log_warning(cds)("Skipping %s: super class %s is excluded", k->name()->as_C_string(), super->name()->as_C_string()); 322 return true; 323 } 324 325 Array<InstanceKlass*>* interfaces = k->local_interfaces(); 326 int len = interfaces->length(); 327 for (int i = 0; i < len; i++) { 328 InstanceKlass* intf = interfaces->at(i); 329 if (check_for_exclusion(intf, nullptr)) { 330 ResourceMark rm; 331 log_warning(cds)("Skipping %s: interface %s is excluded", k->name()->as_C_string(), intf->name()->as_C_string()); 332 return true; 333 } 334 } 335 336 return false; // false == k should NOT be excluded 337 } 338 339 bool SystemDictionaryShared::is_builtin_loader(ClassLoaderData* loader_data) { 340 oop class_loader = loader_data->class_loader(); 341 return (class_loader == nullptr || 342 SystemDictionary::is_system_class_loader(class_loader) || 343 SystemDictionary::is_platform_class_loader(class_loader)); 344 } 345 346 bool SystemDictionaryShared::has_platform_or_app_classes() { 347 if (FileMapInfo::current_info()->has_platform_or_app_classes()) { 348 return true; 349 } 350 if (DynamicArchive::is_mapped() && 351 FileMapInfo::dynamic_info()->has_platform_or_app_classes()) { 352 return true; 353 } 354 return false; 355 } 356 357 // The following stack shows how this code is reached: 358 // 359 // [0] SystemDictionaryShared::find_or_load_shared_class() 360 // [1] JVM_FindLoadedClass 361 // [2] java.lang.ClassLoader.findLoadedClass0() 362 // [3] java.lang.ClassLoader.findLoadedClass() 363 // [4] jdk.internal.loader.BuiltinClassLoader.loadClassOrNull() 364 // [5] jdk.internal.loader.BuiltinClassLoader.loadClass() 365 // [6] jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(), or 366 // jdk.internal.loader.ClassLoaders$PlatformClassLoader.loadClass() 367 // 368 // AppCDS supports fast class loading for these 2 built-in class loaders: 369 // jdk.internal.loader.ClassLoaders$PlatformClassLoader 370 // jdk.internal.loader.ClassLoaders$AppClassLoader 371 // with the following assumptions (based on the JDK core library source code): 372 // 373 // [a] these two loaders use the BuiltinClassLoader.loadClassOrNull() to 374 // load the named class. 375 // [b] BuiltinClassLoader.loadClassOrNull() first calls findLoadedClass(name). 376 // [c] At this point, if we can find the named class inside the 377 // shared_dictionary, we can perform further checks (see 378 // SystemDictionary::is_shared_class_visible) to ensure that this class 379 // was loaded by the same class loader during dump time. 380 // 381 // Given these assumptions, we intercept the findLoadedClass() call to invoke 382 // SystemDictionaryShared::find_or_load_shared_class() to load the shared class from 383 // the archive for the 2 built-in class loaders. This way, 384 // we can improve start-up because we avoid decoding the classfile, 385 // and avoid delegating to the parent loader. 386 // 387 // NOTE: there's a lot of assumption about the Java code. If any of that change, this 388 // needs to be redesigned. 389 390 InstanceKlass* SystemDictionaryShared::find_or_load_shared_class( 391 Symbol* name, Handle class_loader, TRAPS) { 392 InstanceKlass* k = nullptr; 393 if (UseSharedSpaces) { 394 if (!has_platform_or_app_classes()) { 395 return nullptr; 396 } 397 398 if (SystemDictionary::is_system_class_loader(class_loader()) || 399 SystemDictionary::is_platform_class_loader(class_loader())) { 400 // Fix for 4474172; see evaluation for more details 401 class_loader = Handle( 402 THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); 403 ClassLoaderData *loader_data = register_loader(class_loader); 404 Dictionary* dictionary = loader_data->dictionary(); 405 406 // Note: currently, find_or_load_shared_class is called only from 407 // JVM_FindLoadedClass and used for PlatformClassLoader and AppClassLoader, 408 // which are parallel-capable loaders, so a lock here is NOT taken. 409 assert(get_loader_lock_or_null(class_loader) == nullptr, "ObjectLocker not required"); 410 { 411 MutexLocker mu(THREAD, SystemDictionary_lock); 412 InstanceKlass* check = dictionary->find_class(THREAD, name); 413 if (check != nullptr) { 414 return check; 415 } 416 } 417 418 k = load_shared_class_for_builtin_loader(name, class_loader, THREAD); 419 if (k != nullptr) { 420 SharedClassLoadingMark slm(THREAD, k); 421 k = find_or_define_instance_class(name, class_loader, k, CHECK_NULL); 422 } 423 } 424 } 425 return k; 426 } 427 428 class UnregisteredClassesTable : public ResourceHashtable< 429 Symbol*, InstanceKlass*, 430 15889, // prime number 431 AnyObj::C_HEAP> {}; 432 433 static UnregisteredClassesTable* _unregistered_classes_table = nullptr; 434 435 // true == class was successfully added; false == a duplicated class (with the same name) already exists. 436 bool SystemDictionaryShared::add_unregistered_class(Thread* current, InstanceKlass* klass) { 437 // We don't allow duplicated unregistered classes with the same name. 438 // We only archive the first class with that name that succeeds putting 439 // itself into the table. 440 assert(Arguments::is_dumping_archive() || ClassListWriter::is_enabled(), "sanity"); 441 MutexLocker ml(current, UnregisteredClassesTable_lock); 442 Symbol* name = klass->name(); 443 if (_unregistered_classes_table == nullptr) { 444 _unregistered_classes_table = new (mtClass)UnregisteredClassesTable(); 445 } 446 bool created; 447 InstanceKlass** v = _unregistered_classes_table->put_if_absent(name, klass, &created); 448 if (created) { 449 name->increment_refcount(); 450 } 451 return (klass == *v); 452 } 453 454 // This function is called to lookup the super/interfaces of shared classes for 455 // unregistered loaders. E.g., SharedClass in the below example 456 // where "super:" (and optionally "interface:") have been specified. 457 // 458 // java/lang/Object id: 0 459 // Interface id: 2 super: 0 source: cust.jar 460 // SharedClass id: 4 super: 0 interfaces: 2 source: cust.jar 461 InstanceKlass* SystemDictionaryShared::lookup_super_for_unregistered_class( 462 Symbol* class_name, Symbol* super_name, bool is_superclass) { 463 464 assert(DumpSharedSpaces, "only when static dumping"); 465 466 if (!ClassListParser::is_parsing_thread()) { 467 // Unregistered classes can be created only by ClassListParser::_parsing_thread. 468 469 return nullptr; 470 } 471 472 ClassListParser* parser = ClassListParser::instance(); 473 if (parser == nullptr) { 474 // We're still loading the well-known classes, before the ClassListParser is created. 475 return nullptr; 476 } 477 if (class_name->equals(parser->current_class_name())) { 478 // When this function is called, all the numbered super and interface types 479 // must have already been loaded. Hence this function is never recursively called. 480 if (is_superclass) { 481 return parser->lookup_super_for_current_class(super_name); 482 } else { 483 return parser->lookup_interface_for_current_class(super_name); 484 } 485 } else { 486 // The VM is not trying to resolve a super type of parser->current_class_name(). 487 // Instead, it's resolving an error class (because parser->current_class_name() has 488 // failed parsing or verification). Don't do anything here. 489 return nullptr; 490 } 491 } 492 493 void SystemDictionaryShared::set_shared_class_misc_info(InstanceKlass* k, ClassFileStream* cfs) { 494 Arguments::assert_is_dumping_archive(); 495 assert(!is_builtin(k), "must be unregistered class"); 496 DumpTimeClassInfo* info = get_info(k); 497 info->_clsfile_size = cfs->length(); 498 info->_clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length()); 499 } 500 501 void SystemDictionaryShared::initialize() { 502 if (Arguments::is_dumping_archive()) { 503 _dumptime_table = new (mtClass) DumpTimeSharedClassTable; 504 _dumptime_lambda_proxy_class_dictionary = 505 new (mtClass) DumpTimeLambdaProxyClassDictionary; 506 } 507 } 508 509 void SystemDictionaryShared::init_dumptime_info(InstanceKlass* k) { 510 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag); 511 assert(SystemDictionaryShared::class_loading_may_happen(), "sanity"); 512 _dumptime_table->allocate_info(k); 513 } 514 515 void SystemDictionaryShared::remove_dumptime_info(InstanceKlass* k) { 516 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag); 517 _dumptime_table->remove(k); 518 } 519 520 void SystemDictionaryShared::handle_class_unloading(InstanceKlass* klass) { 521 if (Arguments::is_dumping_archive()) { 522 remove_dumptime_info(klass); 523 } 524 525 if (_unregistered_classes_table != nullptr) { 526 // Remove the class from _unregistered_classes_table: keep the entry but 527 // set it to null. This ensure no classes with the same name can be 528 // added again. 529 MutexLocker ml(Thread::current(), UnregisteredClassesTable_lock); 530 InstanceKlass** v = _unregistered_classes_table->get(klass->name()); 531 if (v != nullptr) { 532 *v = nullptr; 533 } 534 } 535 536 if (ClassListWriter::is_enabled()) { 537 ClassListWriter cw; 538 cw.handle_class_unloading((const InstanceKlass*)klass); 539 } 540 } 541 542 // Check if a class or any of its supertypes has been redefined. 543 bool SystemDictionaryShared::has_been_redefined(InstanceKlass* k) { 544 if (k->has_been_redefined()) { 545 return true; 546 } 547 if (k->java_super() != nullptr && has_been_redefined(k->java_super())) { 548 return true; 549 } 550 Array<InstanceKlass*>* interfaces = k->local_interfaces(); 551 int len = interfaces->length(); 552 for (int i = 0; i < len; i++) { 553 if (has_been_redefined(interfaces->at(i))) { 554 return true; 555 } 556 } 557 return false; 558 } 559 560 // k is a class before relocating by ArchiveBuilder 561 void SystemDictionaryShared::validate_before_archiving(InstanceKlass* k) { 562 ResourceMark rm; 563 const char* name = k->name()->as_C_string(); 564 DumpTimeClassInfo* info = _dumptime_table->get(k); 565 assert(!class_loading_may_happen(), "class loading must be disabled"); 566 guarantee(info != nullptr, "Class %s must be entered into _dumptime_table", name); 567 guarantee(!info->is_excluded(), "Should not attempt to archive excluded class %s", name); 568 if (is_builtin(k)) { 569 if (k->is_hidden()) { 570 assert(is_registered_lambda_proxy_class(k), "unexpected hidden class %s", name); 571 } 572 guarantee(!k->is_shared_unregistered_class(), 573 "Class loader type must be set for BUILTIN class %s", name); 574 575 } else { 576 guarantee(k->is_shared_unregistered_class(), 577 "Class loader type must not be set for UNREGISTERED class %s", name); 578 } 579 } 580 581 class UnregisteredClassesDuplicationChecker : StackObj { 582 GrowableArray<InstanceKlass*> _list; 583 Thread* _thread; 584 public: 585 UnregisteredClassesDuplicationChecker() : _thread(Thread::current()) {} 586 587 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) { 588 if (!SystemDictionaryShared::is_builtin(k)) { 589 _list.append(k); 590 } 591 } 592 593 static int compare_by_loader(InstanceKlass** a, InstanceKlass** b) { 594 ClassLoaderData* loader_a = a[0]->class_loader_data(); 595 ClassLoaderData* loader_b = b[0]->class_loader_data(); 596 597 if (loader_a != loader_b) { 598 return intx(loader_a) - intx(loader_b); 599 } else { 600 return intx(a[0]) - intx(b[0]); 601 } 602 } 603 604 void mark_duplicated_classes() { 605 // Two loaders may load two identical or similar hierarchies of classes. If we 606 // check for duplication in random order, we may end up excluding important base classes 607 // in both hierarchies, causing most of the classes to be excluded. 608 // We sort the classes by their loaders. This way we're likely to archive 609 // all classes in the one of the two hierarchies. 610 _list.sort(compare_by_loader); 611 for (int i = 0; i < _list.length(); i++) { 612 InstanceKlass* k = _list.at(i); 613 bool i_am_first = SystemDictionaryShared::add_unregistered_class(_thread, k); 614 if (!i_am_first) { 615 SystemDictionaryShared::warn_excluded(k, "Duplicated unregistered class"); 616 SystemDictionaryShared::set_excluded_locked(k); 617 } 618 } 619 } 620 }; 621 622 void SystemDictionaryShared::check_excluded_classes() { 623 assert(!class_loading_may_happen(), "class loading must be disabled"); 624 assert_lock_strong(DumpTimeTable_lock); 625 626 if (DynamicDumpSharedSpaces) { 627 // Do this first -- if a base class is excluded due to duplication, 628 // all of its subclasses will also be excluded. 629 ResourceMark rm; 630 UnregisteredClassesDuplicationChecker dup_checker; 631 _dumptime_table->iterate_all_live_classes(&dup_checker); 632 dup_checker.mark_duplicated_classes(); 633 } 634 635 auto check_for_exclusion = [&] (InstanceKlass* k, DumpTimeClassInfo& info) { 636 SystemDictionaryShared::check_for_exclusion(k, &info); 637 }; 638 _dumptime_table->iterate_all_live_classes(check_for_exclusion); 639 _dumptime_table->update_counts(); 640 641 cleanup_lambda_proxy_class_dictionary(); 642 } 643 644 bool SystemDictionaryShared::is_excluded_class(InstanceKlass* k) { 645 assert(!class_loading_may_happen(), "class loading must be disabled"); 646 assert_lock_strong(DumpTimeTable_lock); 647 Arguments::assert_is_dumping_archive(); 648 DumpTimeClassInfo* p = get_info_locked(k); 649 return p->is_excluded(); 650 } 651 652 void SystemDictionaryShared::set_excluded_locked(InstanceKlass* k) { 653 assert_lock_strong(DumpTimeTable_lock); 654 Arguments::assert_is_dumping_archive(); 655 DumpTimeClassInfo* info = get_info_locked(k); 656 info->set_excluded(); 657 } 658 659 void SystemDictionaryShared::set_excluded(InstanceKlass* k) { 660 Arguments::assert_is_dumping_archive(); 661 DumpTimeClassInfo* info = get_info(k); 662 info->set_excluded(); 663 } 664 665 void SystemDictionaryShared::set_class_has_failed_verification(InstanceKlass* ik) { 666 Arguments::assert_is_dumping_archive(); 667 DumpTimeClassInfo* p = get_info(ik); 668 p->set_failed_verification(); 669 } 670 671 bool SystemDictionaryShared::has_class_failed_verification(InstanceKlass* ik) { 672 Arguments::assert_is_dumping_archive(); 673 DumpTimeClassInfo* p = _dumptime_table->get(ik); 674 return (p == nullptr) ? false : p->failed_verification(); 675 } 676 677 void SystemDictionaryShared::dumptime_classes_do(class MetaspaceClosure* it) { 678 assert_lock_strong(DumpTimeTable_lock); 679 680 auto do_klass = [&] (InstanceKlass* k, DumpTimeClassInfo& info) { 681 if (k->is_loader_alive() && !info.is_excluded()) { 682 info.metaspace_pointers_do(it); 683 } 684 }; 685 _dumptime_table->iterate_all_live_classes(do_klass); 686 687 auto do_lambda = [&] (LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) { 688 if (key.caller_ik()->is_loader_alive()) { 689 info.metaspace_pointers_do(it); 690 key.metaspace_pointers_do(it); 691 } 692 }; 693 _dumptime_lambda_proxy_class_dictionary->iterate_all(do_lambda); 694 } 695 696 bool SystemDictionaryShared::add_verification_constraint(InstanceKlass* k, Symbol* name, 697 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) { 698 Arguments::assert_is_dumping_archive(); 699 DumpTimeClassInfo* info = get_info(k); 700 info->add_verification_constraint(k, name, from_name, from_field_is_protected, 701 from_is_array, from_is_object); 702 703 if (DynamicDumpSharedSpaces) { 704 // For dynamic dumping, we can resolve all the constraint classes for all class loaders during 705 // the initial run prior to creating the archive before vm exit. We will also perform verification 706 // check when running with the archive. 707 return false; 708 } else { 709 if (is_builtin(k)) { 710 // For builtin class loaders, we can try to complete the verification check at dump time, 711 // because we can resolve all the constraint classes. We will also perform verification check 712 // when running with the archive. 713 return false; 714 } else { 715 // For non-builtin class loaders, we cannot complete the verification check at dump time, 716 // because at dump time we don't know how to resolve classes for such loaders. 717 return true; 718 } 719 } 720 } 721 722 void SystemDictionaryShared::add_enum_klass_static_field(InstanceKlass* ik, int root_index) { 723 assert(DumpSharedSpaces, "static dump only"); 724 DumpTimeClassInfo* info = get_info_locked(ik); 725 info->add_enum_klass_static_field(root_index); 726 } 727 728 void SystemDictionaryShared::add_to_dump_time_lambda_proxy_class_dictionary(LambdaProxyClassKey& key, 729 InstanceKlass* proxy_klass) { 730 assert_lock_strong(DumpTimeTable_lock); 731 732 bool created; 733 DumpTimeLambdaProxyClassInfo* info = _dumptime_lambda_proxy_class_dictionary->put_if_absent(key, &created); 734 info->add_proxy_klass(proxy_klass); 735 if (created) { 736 ++_dumptime_lambda_proxy_class_dictionary->_count; 737 } 738 } 739 740 void SystemDictionaryShared::add_lambda_proxy_class(InstanceKlass* caller_ik, 741 InstanceKlass* lambda_ik, 742 Symbol* invoked_name, 743 Symbol* invoked_type, 744 Symbol* method_type, 745 Method* member_method, 746 Symbol* instantiated_method_type, 747 TRAPS) { 748 749 assert(caller_ik->class_loader() == lambda_ik->class_loader(), "mismatched class loader"); 750 assert(caller_ik->class_loader_data() == lambda_ik->class_loader_data(), "mismatched class loader data"); 751 assert(java_lang_Class::class_data(lambda_ik->java_mirror()) == nullptr, "must not have class data"); 752 753 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag); 754 755 lambda_ik->assign_class_loader_type(); 756 lambda_ik->set_shared_classpath_index(caller_ik->shared_classpath_index()); 757 InstanceKlass* nest_host = caller_ik->nest_host(CHECK); 758 assert(nest_host != nullptr, "unexpected nullptr nest_host"); 759 760 DumpTimeClassInfo* info = _dumptime_table->get(lambda_ik); 761 if (info != nullptr && !lambda_ik->is_non_strong_hidden() && is_builtin(lambda_ik) && is_builtin(caller_ik) 762 // Don't include the lambda proxy if its nest host is not in the "linked" state. 763 && nest_host->is_linked()) { 764 // Set _is_archived_lambda_proxy in DumpTimeClassInfo so that the lambda_ik 765 // won't be excluded during dumping of shared archive. See ExcludeDumpTimeSharedClasses. 766 info->_is_archived_lambda_proxy = true; 767 info->set_nest_host(nest_host); 768 769 LambdaProxyClassKey key(caller_ik, 770 invoked_name, 771 invoked_type, 772 method_type, 773 member_method, 774 instantiated_method_type); 775 add_to_dump_time_lambda_proxy_class_dictionary(key, lambda_ik); 776 } 777 } 778 779 InstanceKlass* SystemDictionaryShared::get_shared_lambda_proxy_class(InstanceKlass* caller_ik, 780 Symbol* invoked_name, 781 Symbol* invoked_type, 782 Symbol* method_type, 783 Method* member_method, 784 Symbol* instantiated_method_type) { 785 MutexLocker ml(CDSLambda_lock, Mutex::_no_safepoint_check_flag); 786 LambdaProxyClassKey key(caller_ik, invoked_name, invoked_type, 787 method_type, member_method, instantiated_method_type); 788 const RunTimeLambdaProxyClassInfo* info = _static_archive.lookup_lambda_proxy_class(&key); 789 if (info == nullptr) { 790 info = _dynamic_archive.lookup_lambda_proxy_class(&key); 791 } 792 InstanceKlass* proxy_klass = nullptr; 793 if (info != nullptr) { 794 InstanceKlass* curr_klass = info->proxy_klass_head(); 795 InstanceKlass* prev_klass = curr_klass; 796 if (curr_klass->lambda_proxy_is_available()) { 797 while (curr_klass->next_link() != nullptr) { 798 prev_klass = curr_klass; 799 curr_klass = InstanceKlass::cast(curr_klass->next_link()); 800 } 801 assert(curr_klass->is_hidden(), "must be"); 802 assert(curr_klass->lambda_proxy_is_available(), "must be"); 803 804 prev_klass->set_next_link(nullptr); 805 proxy_klass = curr_klass; 806 proxy_klass->clear_lambda_proxy_is_available(); 807 if (log_is_enabled(Debug, cds)) { 808 ResourceMark rm; 809 log_debug(cds)("Loaded lambda proxy: %s ", proxy_klass->external_name()); 810 } 811 } else { 812 if (log_is_enabled(Debug, cds)) { 813 ResourceMark rm; 814 log_debug(cds)("Used all archived lambda proxy classes for: %s %s%s", 815 caller_ik->external_name(), invoked_name->as_C_string(), invoked_type->as_C_string()); 816 } 817 } 818 } 819 return proxy_klass; 820 } 821 822 InstanceKlass* SystemDictionaryShared::get_shared_nest_host(InstanceKlass* lambda_ik) { 823 assert(!DumpSharedSpaces && UseSharedSpaces, "called at run time with CDS enabled only"); 824 RunTimeClassInfo* record = RunTimeClassInfo::get_for(lambda_ik); 825 return record->nest_host(); 826 } 827 828 InstanceKlass* SystemDictionaryShared::prepare_shared_lambda_proxy_class(InstanceKlass* lambda_ik, 829 InstanceKlass* caller_ik, TRAPS) { 830 Handle class_loader(THREAD, caller_ik->class_loader()); 831 Handle protection_domain; 832 PackageEntry* pkg_entry = caller_ik->package(); 833 if (caller_ik->class_loader() != nullptr) { 834 protection_domain = CDSProtectionDomain::init_security_info(class_loader, caller_ik, pkg_entry, CHECK_NULL); 835 } 836 837 InstanceKlass* shared_nest_host = get_shared_nest_host(lambda_ik); 838 assert(shared_nest_host != nullptr, "unexpected nullptr _nest_host"); 839 840 InstanceKlass* loaded_lambda = 841 SystemDictionary::load_shared_lambda_proxy_class(lambda_ik, class_loader, protection_domain, pkg_entry, CHECK_NULL); 842 843 if (loaded_lambda == nullptr) { 844 return nullptr; 845 } 846 847 // Ensures the nest host is the same as the lambda proxy's 848 // nest host recorded at dump time. 849 InstanceKlass* nest_host = caller_ik->nest_host(THREAD); 850 assert(nest_host == shared_nest_host, "mismatched nest host"); 851 852 EventClassLoad class_load_start_event; 853 { 854 MutexLocker mu_r(THREAD, Compile_lock); 855 856 // Add to class hierarchy, and do possible deoptimizations. 857 SystemDictionary::add_to_hierarchy(loaded_lambda); 858 // But, do not add to dictionary. 859 } 860 loaded_lambda->link_class(CHECK_NULL); 861 // notify jvmti 862 if (JvmtiExport::should_post_class_load()) { 863 JvmtiExport::post_class_load(THREAD, loaded_lambda); 864 } 865 if (class_load_start_event.should_commit()) { 866 SystemDictionary::post_class_load_event(&class_load_start_event, loaded_lambda, ClassLoaderData::class_loader_data(class_loader())); 867 } 868 869 loaded_lambda->initialize(CHECK_NULL); 870 871 return loaded_lambda; 872 } 873 874 void SystemDictionaryShared::check_verification_constraints(InstanceKlass* klass, 875 TRAPS) { 876 assert(!DumpSharedSpaces && UseSharedSpaces, "called at run time with CDS enabled only"); 877 RunTimeClassInfo* record = RunTimeClassInfo::get_for(klass); 878 879 int length = record->_num_verifier_constraints; 880 if (length > 0) { 881 for (int i = 0; i < length; i++) { 882 RunTimeClassInfo::RTVerifierConstraint* vc = record->verifier_constraint_at(i); 883 Symbol* name = vc->name(); 884 Symbol* from_name = vc->from_name(); 885 char c = record->verifier_constraint_flag(i); 886 887 if (log_is_enabled(Trace, cds, verification)) { 888 ResourceMark rm(THREAD); 889 log_trace(cds, verification)("check_verification_constraint: %s: %s must be subclass of %s [0x%x]", 890 klass->external_name(), from_name->as_klass_external_name(), 891 name->as_klass_external_name(), c); 892 } 893 894 bool from_field_is_protected = (c & SystemDictionaryShared::FROM_FIELD_IS_PROTECTED) ? true : false; 895 bool from_is_array = (c & SystemDictionaryShared::FROM_IS_ARRAY) ? true : false; 896 bool from_is_object = (c & SystemDictionaryShared::FROM_IS_OBJECT) ? true : false; 897 898 bool ok = VerificationType::resolve_and_check_assignability(klass, name, 899 from_name, from_field_is_protected, from_is_array, from_is_object, CHECK); 900 if (!ok) { 901 ResourceMark rm(THREAD); 902 stringStream ss; 903 904 ss.print_cr("Bad type on operand stack"); 905 ss.print_cr("Exception Details:"); 906 ss.print_cr(" Location:\n %s", klass->name()->as_C_string()); 907 ss.print_cr(" Reason:\n Type '%s' is not assignable to '%s'", 908 from_name->as_quoted_ascii(), name->as_quoted_ascii()); 909 THROW_MSG(vmSymbols::java_lang_VerifyError(), ss.as_string()); 910 } 911 } 912 } 913 } 914 915 static oop get_class_loader_by(char type) { 916 if (type == (char)ClassLoader::BOOT_LOADER) { 917 return (oop)nullptr; 918 } else if (type == (char)ClassLoader::PLATFORM_LOADER) { 919 return SystemDictionary::java_platform_loader(); 920 } else { 921 assert (type == (char)ClassLoader::APP_LOADER, "Sanity"); 922 return SystemDictionary::java_system_loader(); 923 } 924 } 925 926 // Record class loader constraints that are checked inside 927 // InstanceKlass::link_class(), so that these can be checked quickly 928 // at runtime without laying out the vtable/itables. 929 void SystemDictionaryShared::record_linking_constraint(Symbol* name, InstanceKlass* klass, 930 Handle loader1, Handle loader2) { 931 // A linking constraint check is executed when: 932 // - klass extends or implements type S 933 // - klass overrides method S.M(...) with X.M 934 // - If klass defines the method M, X is 935 // the same as klass. 936 // - If klass does not define the method M, 937 // X must be a supertype of klass and X.M is 938 // a default method defined by X. 939 // - loader1 = X->class_loader() 940 // - loader2 = S->class_loader() 941 // - loader1 != loader2 942 // - M's parameter(s) include an object type T 943 // We require that 944 // - whenever loader1 and loader2 try to 945 // resolve the type T, they must always resolve to 946 // the same InstanceKlass. 947 // NOTE: type T may or may not be currently resolved in 948 // either of these two loaders. The check itself does not 949 // try to resolve T. 950 oop klass_loader = klass->class_loader(); 951 952 if (!is_system_class_loader(klass_loader) && 953 !is_platform_class_loader(klass_loader)) { 954 // If klass is loaded by system/platform loaders, we can 955 // guarantee that klass and S must be loaded by the same 956 // respective loader between dump time and run time, and 957 // the exact same check on (name, loader1, loader2) will 958 // be executed. Hence, we can cache this check and execute 959 // it at runtime without walking the vtable/itables. 960 // 961 // This cannot be guaranteed for classes loaded by other 962 // loaders, so we bail. 963 return; 964 } 965 966 assert(is_builtin(klass), "must be"); 967 assert(klass_loader != nullptr, "should not be called for boot loader"); 968 assert(loader1 != loader2, "must be"); 969 970 if (DynamicDumpSharedSpaces && Thread::current()->is_VM_thread()) { 971 // We are re-laying out the vtable/itables of the *copy* of 972 // a class during the final stage of dynamic dumping. The 973 // linking constraints for this class has already been recorded. 974 return; 975 } 976 assert(!Thread::current()->is_VM_thread(), "must be"); 977 978 Arguments::assert_is_dumping_archive(); 979 DumpTimeClassInfo* info = get_info(klass); 980 info->record_linking_constraint(name, loader1, loader2); 981 } 982 983 // returns true IFF there's no need to re-initialize the i/v-tables for klass for 984 // the purpose of checking class loader constraints. 985 bool SystemDictionaryShared::check_linking_constraints(Thread* current, InstanceKlass* klass) { 986 assert(!DumpSharedSpaces && UseSharedSpaces, "called at run time with CDS enabled only"); 987 LogTarget(Info, class, loader, constraints) log; 988 if (klass->is_shared_boot_class()) { 989 // No class loader constraint check performed for boot classes. 990 return true; 991 } 992 if (klass->is_shared_platform_class() || klass->is_shared_app_class()) { 993 RunTimeClassInfo* info = RunTimeClassInfo::get_for(klass); 994 assert(info != nullptr, "Sanity"); 995 if (info->_num_loader_constraints > 0) { 996 HandleMark hm(current); 997 for (int i = 0; i < info->_num_loader_constraints; i++) { 998 RunTimeClassInfo::RTLoaderConstraint* lc = info->loader_constraint_at(i); 999 Symbol* name = lc->constraint_name(); 1000 Handle loader1(current, get_class_loader_by(lc->_loader_type1)); 1001 Handle loader2(current, get_class_loader_by(lc->_loader_type2)); 1002 if (log.is_enabled()) { 1003 ResourceMark rm(current); 1004 log.print("[CDS add loader constraint for class %s symbol %s loader[0] %s loader[1] %s", 1005 klass->external_name(), name->as_C_string(), 1006 ClassLoaderData::class_loader_data(loader1())->loader_name_and_id(), 1007 ClassLoaderData::class_loader_data(loader2())->loader_name_and_id()); 1008 } 1009 if (!SystemDictionary::add_loader_constraint(name, klass, loader1, loader2)) { 1010 // Loader constraint violation has been found. The caller 1011 // will re-layout the vtable/itables to produce the correct 1012 // exception. 1013 if (log.is_enabled()) { 1014 log.print(" failed]"); 1015 } 1016 return false; 1017 } 1018 if (log.is_enabled()) { 1019 log.print(" succeeded]"); 1020 } 1021 } 1022 return true; // for all recorded constraints added successfully. 1023 } 1024 } 1025 if (log.is_enabled()) { 1026 ResourceMark rm(current); 1027 log.print("[CDS has not recorded loader constraint for class %s]", klass->external_name()); 1028 } 1029 return false; 1030 } 1031 1032 bool SystemDictionaryShared::is_supported_invokedynamic(BootstrapInfo* bsi) { 1033 LogTarget(Debug, cds, lambda) log; 1034 if (bsi->arg_values() == nullptr || !bsi->arg_values()->is_objArray()) { 1035 if (log.is_enabled()) { 1036 LogStream log_stream(log); 1037 log.print("bsi check failed"); 1038 log.print(" bsi->arg_values().not_null() %d", bsi->arg_values().not_null()); 1039 if (bsi->arg_values().not_null()) { 1040 log.print(" bsi->arg_values()->is_objArray() %d", bsi->arg_values()->is_objArray()); 1041 bsi->print_msg_on(&log_stream); 1042 } 1043 } 1044 return false; 1045 } 1046 1047 Handle bsm = bsi->bsm(); 1048 if (bsm.is_null() || !java_lang_invoke_DirectMethodHandle::is_instance(bsm())) { 1049 if (log.is_enabled()) { 1050 log.print("bsm check failed"); 1051 log.print(" bsm.is_null() %d", bsm.is_null()); 1052 log.print(" java_lang_invoke_DirectMethodHandle::is_instance(bsm()) %d", 1053 java_lang_invoke_DirectMethodHandle::is_instance(bsm())); 1054 } 1055 return false; 1056 } 1057 1058 oop mn = java_lang_invoke_DirectMethodHandle::member(bsm()); 1059 Method* method = java_lang_invoke_MemberName::vmtarget(mn); 1060 if (method->klass_name()->equals("java/lang/invoke/LambdaMetafactory") && 1061 method->name()->equals("metafactory") && 1062 method->signature()->equals("(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;" 1063 "Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;" 1064 "Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;")) { 1065 return true; 1066 } else { 1067 if (log.is_enabled()) { 1068 ResourceMark rm; 1069 log.print("method check failed"); 1070 log.print(" klass_name() %s", method->klass_name()->as_C_string()); 1071 log.print(" name() %s", method->name()->as_C_string()); 1072 log.print(" signature() %s", method->signature()->as_C_string()); 1073 } 1074 } 1075 1076 return false; 1077 } 1078 1079 class EstimateSizeForArchive : StackObj { 1080 size_t _shared_class_info_size; 1081 int _num_builtin_klasses; 1082 int _num_unregistered_klasses; 1083 1084 public: 1085 EstimateSizeForArchive() { 1086 _shared_class_info_size = 0; 1087 _num_builtin_klasses = 0; 1088 _num_unregistered_klasses = 0; 1089 } 1090 1091 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) { 1092 if (!info.is_excluded()) { 1093 size_t byte_size = info.runtime_info_bytesize(); 1094 _shared_class_info_size += align_up(byte_size, SharedSpaceObjectAlignment); 1095 } 1096 } 1097 1098 size_t total() { 1099 return _shared_class_info_size; 1100 } 1101 }; 1102 1103 size_t SystemDictionaryShared::estimate_size_for_archive() { 1104 EstimateSizeForArchive est; 1105 _dumptime_table->iterate_all_live_classes(&est); 1106 size_t total_size = est.total() + 1107 CompactHashtableWriter::estimate_size(_dumptime_table->count_of(true)) + 1108 CompactHashtableWriter::estimate_size(_dumptime_table->count_of(false)); 1109 1110 size_t bytesize = align_up(sizeof(RunTimeLambdaProxyClassInfo), SharedSpaceObjectAlignment); 1111 total_size += 1112 (bytesize * _dumptime_lambda_proxy_class_dictionary->_count) + 1113 CompactHashtableWriter::estimate_size(_dumptime_lambda_proxy_class_dictionary->_count); 1114 1115 return total_size; 1116 } 1117 1118 unsigned int SystemDictionaryShared::hash_for_shared_dictionary(address ptr) { 1119 if (ArchiveBuilder::is_active()) { 1120 uintx offset = ArchiveBuilder::current()->any_to_offset(ptr); 1121 unsigned int hash = primitive_hash<uintx>(offset); 1122 DEBUG_ONLY({ 1123 if (MetaspaceObj::is_shared((const MetaspaceObj*)ptr)) { 1124 assert(hash == SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr), "must be"); 1125 } 1126 }); 1127 return hash; 1128 } else { 1129 return SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr); 1130 } 1131 } 1132 1133 class CopyLambdaProxyClassInfoToArchive : StackObj { 1134 CompactHashtableWriter* _writer; 1135 ArchiveBuilder* _builder; 1136 public: 1137 CopyLambdaProxyClassInfoToArchive(CompactHashtableWriter* writer) 1138 : _writer(writer), _builder(ArchiveBuilder::current()) {} 1139 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) { 1140 // In static dump, info._proxy_klasses->at(0) is already relocated to point to the archived class 1141 // (not the original class). 1142 // 1143 // The following check has been moved to SystemDictionaryShared::check_excluded_classes(), which 1144 // happens before the classes are copied. 1145 // 1146 // if (SystemDictionaryShared::is_excluded_class(info._proxy_klasses->at(0))) { 1147 // return true; 1148 //} 1149 ResourceMark rm; 1150 log_info(cds,dynamic)("Archiving hidden %s", info._proxy_klasses->at(0)->external_name()); 1151 size_t byte_size = sizeof(RunTimeLambdaProxyClassInfo); 1152 RunTimeLambdaProxyClassInfo* runtime_info = 1153 (RunTimeLambdaProxyClassInfo*)ArchiveBuilder::ro_region_alloc(byte_size); 1154 runtime_info->init(key, info); 1155 unsigned int hash = runtime_info->hash(); 1156 u4 delta = _builder->any_to_offset_u4((void*)runtime_info); 1157 _writer->add(hash, delta); 1158 return true; 1159 } 1160 }; 1161 1162 class AdjustLambdaProxyClassInfo : StackObj { 1163 public: 1164 AdjustLambdaProxyClassInfo() {} 1165 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) { 1166 int len = info._proxy_klasses->length(); 1167 if (len > 1) { 1168 for (int i = 0; i < len-1; i++) { 1169 InstanceKlass* ok0 = info._proxy_klasses->at(i+0); // this is original klass 1170 InstanceKlass* ok1 = info._proxy_klasses->at(i+1); // this is original klass 1171 assert(ArchiveBuilder::current()->is_in_buffer_space(ok0), "must be"); 1172 assert(ArchiveBuilder::current()->is_in_buffer_space(ok1), "must be"); 1173 InstanceKlass* bk0 = ok0; 1174 InstanceKlass* bk1 = ok1; 1175 assert(bk0->next_link() == 0, "must be called after Klass::remove_unshareable_info()"); 1176 assert(bk1->next_link() == 0, "must be called after Klass::remove_unshareable_info()"); 1177 bk0->set_next_link(bk1); 1178 bk1->set_lambda_proxy_is_available(); 1179 ArchivePtrMarker::mark_pointer(bk0->next_link_addr()); 1180 } 1181 } 1182 info._proxy_klasses->at(0)->set_lambda_proxy_is_available(); 1183 1184 return true; 1185 } 1186 }; 1187 1188 class CopySharedClassInfoToArchive : StackObj { 1189 CompactHashtableWriter* _writer; 1190 bool _is_builtin; 1191 ArchiveBuilder *_builder; 1192 public: 1193 CopySharedClassInfoToArchive(CompactHashtableWriter* writer, 1194 bool is_builtin) 1195 : _writer(writer), _is_builtin(is_builtin), _builder(ArchiveBuilder::current()) {} 1196 1197 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) { 1198 if (!info.is_excluded() && info.is_builtin() == _is_builtin) { 1199 size_t byte_size = info.runtime_info_bytesize(); 1200 RunTimeClassInfo* record; 1201 record = (RunTimeClassInfo*)ArchiveBuilder::ro_region_alloc(byte_size); 1202 record->init(info); 1203 1204 unsigned int hash; 1205 Symbol* name = info._klass->name(); 1206 hash = SystemDictionaryShared::hash_for_shared_dictionary((address)name); 1207 u4 delta = _builder->buffer_to_offset_u4((address)record); 1208 if (_is_builtin && info._klass->is_hidden()) { 1209 // skip 1210 } else { 1211 _writer->add(hash, delta); 1212 } 1213 if (log_is_enabled(Trace, cds, hashtables)) { 1214 ResourceMark rm; 1215 log_trace(cds,hashtables)("%s dictionary: %s", (_is_builtin ? "builtin" : "unregistered"), info._klass->external_name()); 1216 } 1217 1218 // Save this for quick runtime lookup of InstanceKlass* -> RunTimeClassInfo* 1219 RunTimeClassInfo::set_for(info._klass, record); 1220 } 1221 } 1222 }; 1223 1224 void SystemDictionaryShared::write_lambda_proxy_class_dictionary(LambdaProxyClassDictionary *dictionary) { 1225 CompactHashtableStats stats; 1226 dictionary->reset(); 1227 CompactHashtableWriter writer(_dumptime_lambda_proxy_class_dictionary->_count, &stats); 1228 CopyLambdaProxyClassInfoToArchive copy(&writer); 1229 _dumptime_lambda_proxy_class_dictionary->iterate(©); 1230 writer.dump(dictionary, "lambda proxy class dictionary"); 1231 } 1232 1233 void SystemDictionaryShared::write_dictionary(RunTimeSharedDictionary* dictionary, 1234 bool is_builtin) { 1235 CompactHashtableStats stats; 1236 dictionary->reset(); 1237 CompactHashtableWriter writer(_dumptime_table->count_of(is_builtin), &stats); 1238 CopySharedClassInfoToArchive copy(&writer, is_builtin); 1239 assert_lock_strong(DumpTimeTable_lock); 1240 _dumptime_table->iterate_all_live_classes(©); 1241 writer.dump(dictionary, is_builtin ? "builtin dictionary" : "unregistered dictionary"); 1242 } 1243 1244 void SystemDictionaryShared::write_to_archive(bool is_static_archive) { 1245 ArchiveInfo* archive = get_archive(is_static_archive); 1246 1247 write_dictionary(&archive->_builtin_dictionary, true); 1248 write_dictionary(&archive->_unregistered_dictionary, false); 1249 1250 write_lambda_proxy_class_dictionary(&archive->_lambda_proxy_class_dictionary); 1251 } 1252 1253 void SystemDictionaryShared::adjust_lambda_proxy_class_dictionary() { 1254 AdjustLambdaProxyClassInfo adjuster; 1255 _dumptime_lambda_proxy_class_dictionary->iterate(&adjuster); 1256 } 1257 1258 void SystemDictionaryShared::serialize_dictionary_headers(SerializeClosure* soc, 1259 bool is_static_archive) { 1260 ArchiveInfo* archive = get_archive(is_static_archive); 1261 1262 archive->_builtin_dictionary.serialize_header(soc); 1263 archive->_unregistered_dictionary.serialize_header(soc); 1264 archive->_lambda_proxy_class_dictionary.serialize_header(soc); 1265 } 1266 1267 void SystemDictionaryShared::serialize_vm_classes(SerializeClosure* soc) { 1268 for (auto id : EnumRange<vmClassID>{}) { 1269 soc->do_ptr((void**)vmClasses::klass_addr_at(id)); 1270 } 1271 } 1272 1273 const RunTimeClassInfo* 1274 SystemDictionaryShared::find_record(RunTimeSharedDictionary* static_dict, RunTimeSharedDictionary* dynamic_dict, Symbol* name) { 1275 if (!UseSharedSpaces || !name->is_shared()) { 1276 // The names of all shared classes must also be a shared Symbol. 1277 return nullptr; 1278 } 1279 1280 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(name); 1281 const RunTimeClassInfo* record = nullptr; 1282 if (DynamicArchive::is_mapped()) { 1283 // Use the regenerated holder classes in the dynamic archive as they 1284 // have more methods than those in the base archive. 1285 if (name == vmSymbols::java_lang_invoke_Invokers_Holder() || 1286 name == vmSymbols::java_lang_invoke_DirectMethodHandle_Holder() || 1287 name == vmSymbols::java_lang_invoke_LambdaForm_Holder() || 1288 name == vmSymbols::java_lang_invoke_DelegatingMethodHandle_Holder()) { 1289 record = dynamic_dict->lookup(name, hash, 0); 1290 if (record != nullptr) { 1291 return record; 1292 } 1293 } 1294 } 1295 1296 if (!MetaspaceShared::is_shared_dynamic(name)) { 1297 // The names of all shared classes in the static dict must also be in the 1298 // static archive 1299 record = static_dict->lookup(name, hash, 0); 1300 } 1301 1302 if (record == nullptr && DynamicArchive::is_mapped()) { 1303 record = dynamic_dict->lookup(name, hash, 0); 1304 } 1305 1306 return record; 1307 } 1308 1309 InstanceKlass* SystemDictionaryShared::find_builtin_class(Symbol* name) { 1310 const RunTimeClassInfo* record = find_record(&_static_archive._builtin_dictionary, 1311 &_dynamic_archive._builtin_dictionary, 1312 name); 1313 if (record != nullptr) { 1314 assert(!record->_klass->is_hidden(), "hidden class cannot be looked up by name"); 1315 assert(check_alignment(record->_klass), "Address not aligned"); 1316 // We did not save the classfile data of the generated LambdaForm invoker classes, 1317 // so we cannot support CLFH for such classes. 1318 if (record->_klass->is_generated_shared_class() && JvmtiExport::should_post_class_file_load_hook()) { 1319 return nullptr; 1320 } 1321 return record->_klass; 1322 } else { 1323 return nullptr; 1324 } 1325 } 1326 1327 void SystemDictionaryShared::update_shared_entry(InstanceKlass* k, int id) { 1328 assert(DumpSharedSpaces, "supported only when dumping"); 1329 DumpTimeClassInfo* info = get_info(k); 1330 info->_id = id; 1331 } 1332 1333 const char* class_loader_name_for_shared(Klass* k) { 1334 assert(k != nullptr, "Sanity"); 1335 assert(k->is_shared(), "Must be"); 1336 assert(k->is_instance_klass(), "Must be"); 1337 InstanceKlass* ik = InstanceKlass::cast(k); 1338 if (ik->is_shared_boot_class()) { 1339 return "boot_loader"; 1340 } else if (ik->is_shared_platform_class()) { 1341 return "platform_loader"; 1342 } else if (ik->is_shared_app_class()) { 1343 return "app_loader"; 1344 } else if (ik->is_shared_unregistered_class()) { 1345 return "unregistered_loader"; 1346 } else { 1347 return "unknown loader"; 1348 } 1349 } 1350 1351 class SharedDictionaryPrinter : StackObj { 1352 outputStream* _st; 1353 int _index; 1354 public: 1355 SharedDictionaryPrinter(outputStream* st) : _st(st), _index(0) {} 1356 1357 void do_value(const RunTimeClassInfo* record) { 1358 ResourceMark rm; 1359 _st->print_cr("%4d: %s %s", _index++, record->_klass->external_name(), 1360 class_loader_name_for_shared(record->_klass)); 1361 } 1362 int index() const { return _index; } 1363 }; 1364 1365 class SharedLambdaDictionaryPrinter : StackObj { 1366 outputStream* _st; 1367 int _index; 1368 public: 1369 SharedLambdaDictionaryPrinter(outputStream* st, int idx) : _st(st), _index(idx) {} 1370 1371 void do_value(const RunTimeLambdaProxyClassInfo* record) { 1372 if (record->proxy_klass_head()->lambda_proxy_is_available()) { 1373 ResourceMark rm; 1374 Klass* k = record->proxy_klass_head(); 1375 while (k != nullptr) { 1376 _st->print_cr("%4d: %s %s", _index++, k->external_name(), 1377 class_loader_name_for_shared(k)); 1378 k = k->next_link(); 1379 } 1380 } 1381 } 1382 }; 1383 1384 void SystemDictionaryShared::ArchiveInfo::print_on(const char* prefix, 1385 outputStream* st) { 1386 st->print_cr("%sShared Dictionary", prefix); 1387 SharedDictionaryPrinter p(st); 1388 st->print_cr("%sShared Builtin Dictionary", prefix); 1389 _builtin_dictionary.iterate(&p); 1390 st->print_cr("%sShared Unregistered Dictionary", prefix); 1391 _unregistered_dictionary.iterate(&p); 1392 if (!_lambda_proxy_class_dictionary.empty()) { 1393 st->print_cr("%sShared Lambda Dictionary", prefix); 1394 SharedLambdaDictionaryPrinter ldp(st, p.index()); 1395 _lambda_proxy_class_dictionary.iterate(&ldp); 1396 } 1397 } 1398 1399 void SystemDictionaryShared::ArchiveInfo::print_table_statistics(const char* prefix, 1400 outputStream* st) { 1401 st->print_cr("%sArchve Statistics", prefix); 1402 _builtin_dictionary.print_table_statistics(st, "Builtin Shared Dictionary"); 1403 _unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary"); 1404 _lambda_proxy_class_dictionary.print_table_statistics(st, "Lambda Shared Dictionary"); 1405 } 1406 1407 void SystemDictionaryShared::print_shared_archive(outputStream* st, bool is_static) { 1408 if (UseSharedSpaces) { 1409 if (is_static) { 1410 _static_archive.print_on("", st); 1411 } else { 1412 if (DynamicArchive::is_mapped()) { 1413 _dynamic_archive.print_on("Dynamic ", st); 1414 } 1415 } 1416 } 1417 } 1418 1419 void SystemDictionaryShared::print_on(outputStream* st) { 1420 print_shared_archive(st, true); 1421 print_shared_archive(st, false); 1422 } 1423 1424 void SystemDictionaryShared::print_table_statistics(outputStream* st) { 1425 if (UseSharedSpaces) { 1426 _static_archive.print_table_statistics("Static ", st); 1427 if (DynamicArchive::is_mapped()) { 1428 _dynamic_archive.print_table_statistics("Dynamic ", st); 1429 } 1430 } 1431 } 1432 1433 bool SystemDictionaryShared::is_dumptime_table_empty() { 1434 assert_lock_strong(DumpTimeTable_lock); 1435 _dumptime_table->update_counts(); 1436 if (_dumptime_table->count_of(true) == 0 && _dumptime_table->count_of(false) == 0){ 1437 return true; 1438 } 1439 return false; 1440 } 1441 1442 class CloneDumpTimeClassTable: public StackObj { 1443 DumpTimeSharedClassTable* _table; 1444 DumpTimeSharedClassTable* _cloned_table; 1445 public: 1446 CloneDumpTimeClassTable(DumpTimeSharedClassTable* table, DumpTimeSharedClassTable* clone) : 1447 _table(table), _cloned_table(clone) { 1448 assert(_table != nullptr, "_dumptime_table is nullptr"); 1449 assert(_cloned_table != nullptr, "_cloned_table is nullptr"); 1450 } 1451 void do_entry(InstanceKlass* k, DumpTimeClassInfo& info) { 1452 bool created; 1453 _cloned_table->put_if_absent(k, info, &created); 1454 assert(created, "must be"); 1455 } 1456 }; 1457 1458 class CloneDumpTimeLambdaProxyClassTable: StackObj { 1459 DumpTimeLambdaProxyClassDictionary* _table; 1460 DumpTimeLambdaProxyClassDictionary* _cloned_table; 1461 public: 1462 CloneDumpTimeLambdaProxyClassTable(DumpTimeLambdaProxyClassDictionary* table, 1463 DumpTimeLambdaProxyClassDictionary* clone) : 1464 _table(table), _cloned_table(clone) { 1465 assert(_table != nullptr, "_dumptime_table is nullptr"); 1466 assert(_cloned_table != nullptr, "_cloned_table is nullptr"); 1467 } 1468 1469 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) { 1470 assert_lock_strong(DumpTimeTable_lock); 1471 bool created; 1472 // make copies then store in _clone_table 1473 LambdaProxyClassKey keyCopy = key; 1474 _cloned_table->put_if_absent(keyCopy, info, &created); 1475 assert(created, "must be"); 1476 ++ _cloned_table->_count; 1477 return true; // keep on iterating 1478 } 1479 }; 1480 1481 // When dumping the CDS archive, the ArchiveBuilder will irrecoverably modify the 1482 // _dumptime_table and _dumptime_lambda_proxy_class_dictionary (e.g., metaspace 1483 // pointers are changed to use "buffer" addresses.) 1484 // 1485 // We save a copy of these tables and restore them after the dumping is finished. 1486 // This makes it possible to repeat the dumping operation (e.g., use 1487 // "jcmd VM.cds dynamic_dump" multiple times on the same JVM process). 1488 // 1489 // We use the copy constructors to clone the values in these tables. The copy constructors 1490 // must make a deep copy, as internal data structures such as the contents of 1491 // DumpTimeClassInfo::_loader_constraints are also modified by the ArchiveBuilder. 1492 1493 void SystemDictionaryShared::clone_dumptime_tables() { 1494 Arguments::assert_is_dumping_archive(); 1495 assert_lock_strong(DumpTimeTable_lock); 1496 1497 assert(_cloned_dumptime_table == nullptr, "_cloned_dumptime_table must be cleaned"); 1498 _cloned_dumptime_table = new (mtClass) DumpTimeSharedClassTable; 1499 CloneDumpTimeClassTable copy_classes(_dumptime_table, _cloned_dumptime_table); 1500 _dumptime_table->iterate_all_live_classes(©_classes); 1501 _cloned_dumptime_table->update_counts(); 1502 1503 assert(_cloned_dumptime_lambda_proxy_class_dictionary == nullptr, 1504 "_cloned_dumptime_lambda_proxy_class_dictionary must be cleaned"); 1505 _cloned_dumptime_lambda_proxy_class_dictionary = 1506 new (mtClass) DumpTimeLambdaProxyClassDictionary; 1507 CloneDumpTimeLambdaProxyClassTable copy_proxy_classes(_dumptime_lambda_proxy_class_dictionary, 1508 _cloned_dumptime_lambda_proxy_class_dictionary); 1509 _dumptime_lambda_proxy_class_dictionary->iterate(©_proxy_classes); 1510 } 1511 1512 void SystemDictionaryShared::restore_dumptime_tables() { 1513 assert_lock_strong(DumpTimeTable_lock); 1514 delete _dumptime_table; 1515 _dumptime_table = _cloned_dumptime_table; 1516 _cloned_dumptime_table = nullptr; 1517 1518 delete _dumptime_lambda_proxy_class_dictionary; 1519 _dumptime_lambda_proxy_class_dictionary = _cloned_dumptime_lambda_proxy_class_dictionary; 1520 _cloned_dumptime_lambda_proxy_class_dictionary = nullptr; 1521 } 1522 1523 class CleanupDumpTimeLambdaProxyClassTable: StackObj { 1524 public: 1525 bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) { 1526 assert_lock_strong(DumpTimeTable_lock); 1527 InstanceKlass* caller_ik = key.caller_ik(); 1528 InstanceKlass* nest_host = caller_ik->nest_host_not_null(); 1529 1530 // If the caller class and/or nest_host are excluded, the associated lambda proxy 1531 // must also be excluded. 1532 bool always_exclude = SystemDictionaryShared::check_for_exclusion(caller_ik, nullptr) || 1533 SystemDictionaryShared::check_for_exclusion(nest_host, nullptr); 1534 1535 for (int i = info._proxy_klasses->length() - 1; i >= 0; i--) { 1536 InstanceKlass* ik = info._proxy_klasses->at(i); 1537 if (always_exclude || SystemDictionaryShared::check_for_exclusion(ik, nullptr)) { 1538 SystemDictionaryShared::reset_registered_lambda_proxy_class(ik); 1539 info._proxy_klasses->remove_at(i); 1540 } 1541 } 1542 return info._proxy_klasses->length() == 0 ? true /* delete the node*/ : false; 1543 } 1544 }; 1545 1546 void SystemDictionaryShared::cleanup_lambda_proxy_class_dictionary() { 1547 assert_lock_strong(DumpTimeTable_lock); 1548 CleanupDumpTimeLambdaProxyClassTable cleanup_proxy_classes; 1549 _dumptime_lambda_proxy_class_dictionary->unlink(&cleanup_proxy_classes); 1550 }