1 /* 2 * Copyright (c) 2018, 2025, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "cds/aotArtifactFinder.hpp" 26 #include "cds/aotClassInitializer.hpp" 27 #include "cds/aotClassLocation.hpp" 28 #include "cds/aotLogging.hpp" 29 #include "cds/aotReferenceObjSupport.hpp" 30 #include "cds/archiveBuilder.hpp" 31 #include "cds/archiveHeapLoader.hpp" 32 #include "cds/archiveHeapWriter.hpp" 33 #include "cds/archiveUtils.hpp" 34 #include "cds/cdsConfig.hpp" 35 #include "cds/cdsEnumKlass.hpp" 36 #include "cds/cdsHeapVerifier.hpp" 37 #include "cds/heapShared.hpp" 38 #include "cds/metaspaceShared.hpp" 39 #include "cds/regeneratedClasses.hpp" 40 #include "classfile/classLoaderData.hpp" 41 #include "classfile/javaClasses.inline.hpp" 42 #include "classfile/modules.hpp" 43 #include "classfile/stringTable.hpp" 44 #include "classfile/symbolTable.hpp" 45 #include "classfile/systemDictionary.hpp" 46 #include "classfile/systemDictionaryShared.hpp" 47 #include "classfile/vmClasses.hpp" 48 #include "classfile/vmSymbols.hpp" 49 #include "gc/shared/collectedHeap.hpp" 50 #include "gc/shared/gcLocker.hpp" 51 #include "gc/shared/gcVMOperations.hpp" 52 #include "logging/log.hpp" 53 #include "logging/logStream.hpp" 54 #include "memory/iterator.inline.hpp" 55 #include "memory/resourceArea.hpp" 56 #include "memory/universe.hpp" 57 #include "oops/compressedOops.inline.hpp" 58 #include "oops/fieldStreams.inline.hpp" 59 #include "oops/objArrayOop.inline.hpp" 60 #include "oops/oop.inline.hpp" 61 #include "oops/typeArrayOop.inline.hpp" 62 #include "prims/jvmtiExport.hpp" 63 #include "runtime/arguments.hpp" 64 #include "runtime/fieldDescriptor.inline.hpp" 65 #include "runtime/init.hpp" 66 #include "runtime/javaCalls.hpp" 67 #include "runtime/mutexLocker.hpp" 68 #include "runtime/safepointVerifiers.hpp" 69 #include "utilities/bitMap.inline.hpp" 70 #include "utilities/copy.hpp" 71 #if INCLUDE_G1GC 72 #include "gc/g1/g1CollectedHeap.hpp" 73 #endif 74 75 #if INCLUDE_CDS_JAVA_HEAP 76 77 struct ArchivableStaticFieldInfo { 78 const char* klass_name; 79 const char* field_name; 80 InstanceKlass* klass; 81 int offset; 82 BasicType type; 83 84 ArchivableStaticFieldInfo(const char* k, const char* f) 85 : klass_name(k), field_name(f), klass(nullptr), offset(0), type(T_ILLEGAL) {} 86 87 bool valid() { 88 return klass_name != nullptr; 89 } 90 }; 91 92 DumpedInternedStrings *HeapShared::_dumped_interned_strings = nullptr; 93 94 size_t HeapShared::_alloc_count[HeapShared::ALLOC_STAT_SLOTS]; 95 size_t HeapShared::_alloc_size[HeapShared::ALLOC_STAT_SLOTS]; 96 size_t HeapShared::_total_obj_count; 97 size_t HeapShared::_total_obj_size; 98 99 #ifndef PRODUCT 100 #define ARCHIVE_TEST_FIELD_NAME "archivedObjects" 101 static Array<char>* _archived_ArchiveHeapTestClass = nullptr; 102 static const char* _test_class_name = nullptr; 103 static Klass* _test_class = nullptr; 104 static const ArchivedKlassSubGraphInfoRecord* _test_class_record = nullptr; 105 #endif 106 107 108 // 109 // If you add new entries to the following tables, you should know what you're doing! 110 // 111 112 static ArchivableStaticFieldInfo archive_subgraph_entry_fields[] = { 113 {"java/lang/Integer$IntegerCache", "archivedCache"}, 114 {"java/lang/Long$LongCache", "archivedCache"}, 115 {"java/lang/Byte$ByteCache", "archivedCache"}, 116 {"java/lang/Short$ShortCache", "archivedCache"}, 117 {"java/lang/Character$CharacterCache", "archivedCache"}, 118 {"java/util/jar/Attributes$Name", "KNOWN_NAMES"}, 119 {"sun/util/locale/BaseLocale", "constantBaseLocales"}, 120 {"jdk/internal/module/ArchivedModuleGraph", "archivedModuleGraph"}, 121 {"java/util/ImmutableCollections", "archivedObjects"}, 122 {"java/lang/ModuleLayer", "EMPTY_LAYER"}, 123 {"java/lang/module/Configuration", "EMPTY_CONFIGURATION"}, 124 {"jdk/internal/math/FDBigInteger", "archivedCaches"}, 125 126 #ifndef PRODUCT 127 {nullptr, nullptr}, // Extra slot for -XX:ArchiveHeapTestClass 128 #endif 129 {nullptr, nullptr}, 130 }; 131 132 // full module graph 133 static ArchivableStaticFieldInfo fmg_archive_subgraph_entry_fields[] = { 134 {"jdk/internal/loader/ArchivedClassLoaders", "archivedClassLoaders"}, 135 {ARCHIVED_BOOT_LAYER_CLASS, ARCHIVED_BOOT_LAYER_FIELD}, 136 {"java/lang/Module$ArchivedData", "archivedData"}, 137 {nullptr, nullptr}, 138 }; 139 140 KlassSubGraphInfo* HeapShared::_dump_time_special_subgraph; 141 ArchivedKlassSubGraphInfoRecord* HeapShared::_run_time_special_subgraph; 142 GrowableArrayCHeap<oop, mtClassShared>* HeapShared::_pending_roots = nullptr; 143 GrowableArrayCHeap<OopHandle, mtClassShared>* HeapShared::_root_segments = nullptr; 144 int HeapShared::_root_segment_max_size_elems; 145 OopHandle HeapShared::_scratch_basic_type_mirrors[T_VOID+1]; 146 MetaspaceObjToOopHandleTable* HeapShared::_scratch_objects_table = nullptr; 147 148 static bool is_subgraph_root_class_of(ArchivableStaticFieldInfo fields[], InstanceKlass* ik) { 149 for (int i = 0; fields[i].valid(); i++) { 150 if (fields[i].klass == ik) { 151 return true; 152 } 153 } 154 return false; 155 } 156 157 bool HeapShared::is_subgraph_root_class(InstanceKlass* ik) { 158 return is_subgraph_root_class_of(archive_subgraph_entry_fields, ik) || 159 is_subgraph_root_class_of(fmg_archive_subgraph_entry_fields, ik); 160 } 161 162 unsigned HeapShared::oop_hash(oop const& p) { 163 // Do not call p->identity_hash() as that will update the 164 // object header. 165 return primitive_hash(cast_from_oop<intptr_t>(p)); 166 } 167 168 static void reset_states(oop obj, TRAPS) { 169 Handle h_obj(THREAD, obj); 170 InstanceKlass* klass = InstanceKlass::cast(obj->klass()); 171 TempNewSymbol method_name = SymbolTable::new_symbol("resetArchivedStates"); 172 Symbol* method_sig = vmSymbols::void_method_signature(); 173 174 while (klass != nullptr) { 175 Method* method = klass->find_method(method_name, method_sig); 176 if (method != nullptr) { 177 assert(method->is_private(), "must be"); 178 if (log_is_enabled(Debug, aot)) { 179 ResourceMark rm(THREAD); 180 log_debug(aot)(" calling %s", method->name_and_sig_as_C_string()); 181 } 182 JavaValue result(T_VOID); 183 JavaCalls::call_special(&result, h_obj, klass, 184 method_name, method_sig, CHECK); 185 } 186 klass = klass->java_super(); 187 } 188 } 189 190 void HeapShared::reset_archived_object_states(TRAPS) { 191 assert(CDSConfig::is_dumping_heap(), "dump-time only"); 192 log_debug(aot)("Resetting platform loader"); 193 reset_states(SystemDictionary::java_platform_loader(), CHECK); 194 log_debug(aot)("Resetting system loader"); 195 reset_states(SystemDictionary::java_system_loader(), CHECK); 196 197 // Clean up jdk.internal.loader.ClassLoaders::bootLoader(), which is not 198 // directly used for class loading, but rather is used by the core library 199 // to keep track of resources, etc, loaded by the null class loader. 200 // 201 // Note, this object is non-null, and is not the same as 202 // ClassLoaderData::the_null_class_loader_data()->class_loader(), 203 // which is null. 204 log_debug(aot)("Resetting boot loader"); 205 JavaValue result(T_OBJECT); 206 JavaCalls::call_static(&result, 207 vmClasses::jdk_internal_loader_ClassLoaders_klass(), 208 vmSymbols::bootLoader_name(), 209 vmSymbols::void_BuiltinClassLoader_signature(), 210 CHECK); 211 Handle boot_loader(THREAD, result.get_oop()); 212 reset_states(boot_loader(), CHECK); 213 } 214 215 HeapShared::ArchivedObjectCache* HeapShared::_archived_object_cache = nullptr; 216 217 bool HeapShared::has_been_archived(oop obj) { 218 assert(CDSConfig::is_dumping_heap(), "dump-time only"); 219 return archived_object_cache()->get(obj) != nullptr; 220 } 221 222 int HeapShared::append_root(oop obj) { 223 assert(CDSConfig::is_dumping_heap(), "dump-time only"); 224 if (obj != nullptr) { 225 assert(has_been_archived(obj), "must be"); 226 } 227 // No GC should happen since we aren't scanning _pending_roots. 228 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); 229 230 return _pending_roots->append(obj); 231 } 232 233 objArrayOop HeapShared::root_segment(int segment_idx) { 234 if (CDSConfig::is_dumping_heap()) { 235 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); 236 } else { 237 assert(CDSConfig::is_using_archive(), "must be"); 238 } 239 240 objArrayOop segment = (objArrayOop)_root_segments->at(segment_idx).resolve(); 241 assert(segment != nullptr, "should have been initialized"); 242 return segment; 243 } 244 245 void HeapShared::get_segment_indexes(int idx, int& seg_idx, int& int_idx) { 246 assert(_root_segment_max_size_elems > 0, "sanity"); 247 248 // Try to avoid divisions for the common case. 249 if (idx < _root_segment_max_size_elems) { 250 seg_idx = 0; 251 int_idx = idx; 252 } else { 253 seg_idx = idx / _root_segment_max_size_elems; 254 int_idx = idx % _root_segment_max_size_elems; 255 } 256 257 assert(idx == seg_idx * _root_segment_max_size_elems + int_idx, 258 "sanity: %d index maps to %d segment and %d internal", idx, seg_idx, int_idx); 259 } 260 261 // Returns an objArray that contains all the roots of the archived objects 262 oop HeapShared::get_root(int index, bool clear) { 263 assert(index >= 0, "sanity"); 264 assert(!CDSConfig::is_dumping_heap() && CDSConfig::is_using_archive(), "runtime only"); 265 assert(!_root_segments->is_empty(), "must have loaded shared heap"); 266 int seg_idx, int_idx; 267 get_segment_indexes(index, seg_idx, int_idx); 268 oop result = root_segment(seg_idx)->obj_at(int_idx); 269 if (clear) { 270 clear_root(index); 271 } 272 return result; 273 } 274 275 void HeapShared::clear_root(int index) { 276 assert(index >= 0, "sanity"); 277 assert(CDSConfig::is_using_archive(), "must be"); 278 if (ArchiveHeapLoader::is_in_use()) { 279 int seg_idx, int_idx; 280 get_segment_indexes(index, seg_idx, int_idx); 281 if (log_is_enabled(Debug, aot, heap)) { 282 oop old = root_segment(seg_idx)->obj_at(int_idx); 283 log_debug(aot, heap)("Clearing root %d: was " PTR_FORMAT, index, p2i(old)); 284 } 285 root_segment(seg_idx)->obj_at_put(int_idx, nullptr); 286 } 287 } 288 289 bool HeapShared::archive_object(oop obj, oop referrer, KlassSubGraphInfo* subgraph_info) { 290 assert(CDSConfig::is_dumping_heap(), "dump-time only"); 291 292 assert(!obj->is_stackChunk(), "do not archive stack chunks"); 293 if (has_been_archived(obj)) { 294 return true; 295 } 296 297 if (ArchiveHeapWriter::is_too_large_to_archive(obj->size())) { 298 log_debug(aot, heap)("Cannot archive, object (" PTR_FORMAT ") is too large: %zu", 299 p2i(obj), obj->size()); 300 debug_trace(); 301 return false; 302 } else { 303 count_allocation(obj->size()); 304 ArchiveHeapWriter::add_source_obj(obj); 305 CachedOopInfo info = make_cached_oop_info(obj, referrer); 306 archived_object_cache()->put_when_absent(obj, info); 307 archived_object_cache()->maybe_grow(); 308 mark_native_pointers(obj); 309 310 Klass* k = obj->klass(); 311 if (k->is_instance_klass()) { 312 // Whenever we see a non-array Java object of type X, we mark X to be aot-initialized. 313 // This ensures that during the production run, whenever Java code sees a cached object 314 // of type X, we know that X is already initialized. (see TODO comment below ...) 315 316 if (InstanceKlass::cast(k)->is_enum_subclass() 317 // We can't rerun <clinit> of enum classes (see cdsEnumKlass.cpp) so 318 // we must store them as AOT-initialized. 319 || (subgraph_info == _dump_time_special_subgraph)) 320 // TODO: we do this only for the special subgraph for now. Extending this to 321 // other subgraphs would require more refactoring of the core library (such as 322 // move some initialization logic into runtimeSetup()). 323 // 324 // For the other subgraphs, we have a weaker mechanism to ensure that 325 // all classes in a subgraph are initialized before the subgraph is programmatically 326 // returned from jdk.internal.misc.CDS::initializeFromArchive(). 327 // See HeapShared::initialize_from_archived_subgraph(). 328 { 329 AOTArtifactFinder::add_aot_inited_class(InstanceKlass::cast(k)); 330 } 331 332 if (java_lang_Class::is_instance(obj)) { 333 Klass* mirror_k = java_lang_Class::as_Klass(obj); 334 if (mirror_k != nullptr) { 335 AOTArtifactFinder::add_cached_class(mirror_k); 336 } 337 } else if (java_lang_invoke_ResolvedMethodName::is_instance(obj)) { 338 Method* m = java_lang_invoke_ResolvedMethodName::vmtarget(obj); 339 if (m != nullptr) { 340 if (RegeneratedClasses::has_been_regenerated(m)) { 341 m = RegeneratedClasses::get_regenerated_object(m); 342 } 343 InstanceKlass* method_holder = m->method_holder(); 344 AOTArtifactFinder::add_cached_class(method_holder); 345 } 346 } 347 } 348 349 if (log_is_enabled(Debug, aot, heap)) { 350 ResourceMark rm; 351 LogTarget(Debug, aot, heap) log; 352 LogStream out(log); 353 out.print("Archived heap object " PTR_FORMAT " : %s ", 354 p2i(obj), obj->klass()->external_name()); 355 if (java_lang_Class::is_instance(obj)) { 356 Klass* k = java_lang_Class::as_Klass(obj); 357 if (k != nullptr) { 358 out.print("%s", k->external_name()); 359 } else { 360 out.print("primitive"); 361 } 362 } 363 out.cr(); 364 } 365 366 return true; 367 } 368 } 369 370 class MetaspaceObjToOopHandleTable: public ResourceHashtable<MetaspaceObj*, OopHandle, 371 36137, // prime number 372 AnyObj::C_HEAP, 373 mtClassShared> { 374 public: 375 oop get_oop(MetaspaceObj* ptr) { 376 MutexLocker ml(ScratchObjects_lock, Mutex::_no_safepoint_check_flag); 377 OopHandle* handle = get(ptr); 378 if (handle != nullptr) { 379 return handle->resolve(); 380 } else { 381 return nullptr; 382 } 383 } 384 void set_oop(MetaspaceObj* ptr, oop o) { 385 MutexLocker ml(ScratchObjects_lock, Mutex::_no_safepoint_check_flag); 386 OopHandle handle(Universe::vm_global(), o); 387 bool is_new = put(ptr, handle); 388 assert(is_new, "cannot set twice"); 389 } 390 void remove_oop(MetaspaceObj* ptr) { 391 MutexLocker ml(ScratchObjects_lock, Mutex::_no_safepoint_check_flag); 392 OopHandle* handle = get(ptr); 393 if (handle != nullptr) { 394 handle->release(Universe::vm_global()); 395 remove(ptr); 396 } 397 } 398 }; 399 400 void HeapShared::add_scratch_resolved_references(ConstantPool* src, objArrayOop dest) { 401 if (SystemDictionaryShared::is_builtin_loader(src->pool_holder()->class_loader_data())) { 402 _scratch_objects_table->set_oop(src, dest); 403 } 404 } 405 406 objArrayOop HeapShared::scratch_resolved_references(ConstantPool* src) { 407 return (objArrayOop)_scratch_objects_table->get_oop(src); 408 } 409 410 void HeapShared::init_dumping() { 411 _scratch_objects_table = new (mtClass)MetaspaceObjToOopHandleTable(); 412 _pending_roots = new GrowableArrayCHeap<oop, mtClassShared>(500); 413 } 414 415 void HeapShared::init_scratch_objects_for_basic_type_mirrors(TRAPS) { 416 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 417 BasicType bt = (BasicType)i; 418 if (!is_reference_type(bt)) { 419 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK); 420 _scratch_basic_type_mirrors[i] = OopHandle(Universe::vm_global(), m); 421 } 422 } 423 } 424 425 // Given java_mirror that represents a (primitive or reference) type T, 426 // return the "scratch" version that represents the same type T. 427 // Note that if java_mirror will be returned if it's already a 428 // scratch mirror. 429 // 430 // See java_lang_Class::create_scratch_mirror() for more info. 431 oop HeapShared::scratch_java_mirror(oop java_mirror) { 432 assert(java_lang_Class::is_instance(java_mirror), "must be"); 433 434 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 435 BasicType bt = (BasicType)i; 436 if (!is_reference_type(bt)) { 437 if (_scratch_basic_type_mirrors[i].resolve() == java_mirror) { 438 return java_mirror; 439 } 440 } 441 } 442 443 if (java_lang_Class::is_primitive(java_mirror)) { 444 return scratch_java_mirror(java_lang_Class::as_BasicType(java_mirror)); 445 } else { 446 return scratch_java_mirror(java_lang_Class::as_Klass(java_mirror)); 447 } 448 } 449 450 oop HeapShared::scratch_java_mirror(BasicType t) { 451 assert((uint)t < T_VOID+1, "range check"); 452 assert(!is_reference_type(t), "sanity"); 453 return _scratch_basic_type_mirrors[t].resolve(); 454 } 455 456 oop HeapShared::scratch_java_mirror(Klass* k) { 457 return _scratch_objects_table->get_oop(k); 458 } 459 460 void HeapShared::set_scratch_java_mirror(Klass* k, oop mirror) { 461 _scratch_objects_table->set_oop(k, mirror); 462 } 463 464 void HeapShared::remove_scratch_objects(Klass* k) { 465 // Klass is being deallocated. Java mirror can still be alive, and it should not 466 // point to dead klass. We need to break the link from mirror to the Klass. 467 // See how InstanceKlass::deallocate_contents does it for normal mirrors. 468 oop mirror = _scratch_objects_table->get_oop(k); 469 if (mirror != nullptr) { 470 java_lang_Class::set_klass(mirror, nullptr); 471 } 472 _scratch_objects_table->remove_oop(k); 473 if (k->is_instance_klass()) { 474 _scratch_objects_table->remove(InstanceKlass::cast(k)->constants()); 475 } 476 } 477 478 //TODO: we eventually want a more direct test for these kinds of things. 479 //For example the JVM could record some bit of context from the creation 480 //of the klass, such as who called the hidden class factory. Using 481 //string compares on names is fragile and will break as soon as somebody 482 //changes the names in the JDK code. See discussion in JDK-8342481 for 483 //related ideas about marking AOT-related classes. 484 bool HeapShared::is_lambda_form_klass(InstanceKlass* ik) { 485 return ik->is_hidden() && 486 (ik->name()->starts_with("java/lang/invoke/LambdaForm$MH+") || 487 ik->name()->starts_with("java/lang/invoke/LambdaForm$DMH+") || 488 ik->name()->starts_with("java/lang/invoke/LambdaForm$BMH+") || 489 ik->name()->starts_with("java/lang/invoke/LambdaForm$VH+")); 490 } 491 492 bool HeapShared::is_lambda_proxy_klass(InstanceKlass* ik) { 493 return ik->is_hidden() && (ik->name()->index_of_at(0, "$$Lambda+", 9) > 0); 494 } 495 496 bool HeapShared::is_string_concat_klass(InstanceKlass* ik) { 497 return ik->is_hidden() && ik->name()->starts_with("java/lang/String$$StringConcat"); 498 } 499 500 bool HeapShared::is_archivable_hidden_klass(InstanceKlass* ik) { 501 return CDSConfig::is_dumping_method_handles() && 502 (is_lambda_form_klass(ik) || is_lambda_proxy_klass(ik) || is_string_concat_klass(ik)); 503 } 504 505 506 void HeapShared::copy_and_rescan_aot_inited_mirror(InstanceKlass* ik) { 507 ik->set_has_aot_initialized_mirror(); 508 if (AOTClassInitializer::is_runtime_setup_required(ik)) { 509 ik->set_is_runtime_setup_required(); 510 } 511 512 oop orig_mirror; 513 if (RegeneratedClasses::is_regenerated_object(ik)) { 514 InstanceKlass* orig_ik = RegeneratedClasses::get_original_object(ik); 515 precond(orig_ik->is_initialized()); 516 orig_mirror = orig_ik->java_mirror(); 517 } else { 518 precond(ik->is_initialized()); 519 orig_mirror = ik->java_mirror(); 520 } 521 522 oop m = scratch_java_mirror(ik); 523 int nfields = 0; 524 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 525 if (fs.access_flags().is_static()) { 526 fieldDescriptor& fd = fs.field_descriptor(); 527 int offset = fd.offset(); 528 switch (fd.field_type()) { 529 case T_OBJECT: 530 case T_ARRAY: 531 { 532 oop field_obj = orig_mirror->obj_field(offset); 533 if (offset == java_lang_Class::reflection_data_offset()) { 534 // Class::reflectData use SoftReference, which cannot be archived. Set it 535 // to null and it will be recreated at runtime. 536 field_obj = nullptr; 537 } 538 m->obj_field_put(offset, field_obj); 539 if (field_obj != nullptr) { 540 bool success = archive_reachable_objects_from(1, _dump_time_special_subgraph, field_obj); 541 assert(success, "sanity"); 542 } 543 } 544 break; 545 case T_BOOLEAN: 546 m->bool_field_put(offset, orig_mirror->bool_field(offset)); 547 break; 548 case T_BYTE: 549 m->byte_field_put(offset, orig_mirror->byte_field(offset)); 550 break; 551 case T_SHORT: 552 m->short_field_put(offset, orig_mirror->short_field(offset)); 553 break; 554 case T_CHAR: 555 m->char_field_put(offset, orig_mirror->char_field(offset)); 556 break; 557 case T_INT: 558 m->int_field_put(offset, orig_mirror->int_field(offset)); 559 break; 560 case T_LONG: 561 m->long_field_put(offset, orig_mirror->long_field(offset)); 562 break; 563 case T_FLOAT: 564 m->float_field_put(offset, orig_mirror->float_field(offset)); 565 break; 566 case T_DOUBLE: 567 m->double_field_put(offset, orig_mirror->double_field(offset)); 568 break; 569 default: 570 ShouldNotReachHere(); 571 } 572 nfields ++; 573 } 574 } 575 576 oop class_data = java_lang_Class::class_data(orig_mirror); 577 java_lang_Class::set_class_data(m, class_data); 578 if (class_data != nullptr) { 579 bool success = archive_reachable_objects_from(1, _dump_time_special_subgraph, class_data); 580 assert(success, "sanity"); 581 } 582 583 if (log_is_enabled(Debug, aot, init)) { 584 ResourceMark rm; 585 log_debug(aot, init)("copied %3d field(s) in aot-initialized mirror %s%s%s", nfields, ik->external_name(), 586 ik->is_hidden() ? " (hidden)" : "", 587 ik->is_enum_subclass() ? " (enum)" : ""); 588 } 589 } 590 591 static void copy_java_mirror_hashcode(oop orig_mirror, oop scratch_m) { 592 // We need to retain the identity_hash, because it may have been used by some hashtables 593 // in the shared heap. 594 if (!orig_mirror->fast_no_hash_check()) { 595 intptr_t src_hash = orig_mirror->identity_hash(); 596 if (UseCompactObjectHeaders) { 597 narrowKlass nk = CompressedKlassPointers::encode(orig_mirror->klass()); 598 scratch_m->set_mark(markWord::prototype().set_narrow_klass(nk).copy_set_hash(src_hash)); 599 } else { 600 scratch_m->set_mark(markWord::prototype().copy_set_hash(src_hash)); 601 } 602 assert(scratch_m->mark().is_unlocked(), "sanity"); 603 604 DEBUG_ONLY(intptr_t archived_hash = scratch_m->identity_hash()); 605 assert(src_hash == archived_hash, "Different hash codes: original " INTPTR_FORMAT ", archived " INTPTR_FORMAT, src_hash, archived_hash); 606 } 607 } 608 609 static objArrayOop get_archived_resolved_references(InstanceKlass* src_ik) { 610 if (SystemDictionaryShared::is_builtin_loader(src_ik->class_loader_data())) { 611 objArrayOop rr = src_ik->constants()->resolved_references_or_null(); 612 if (rr != nullptr && !ArchiveHeapWriter::is_too_large_to_archive(rr)) { 613 return HeapShared::scratch_resolved_references(src_ik->constants()); 614 } 615 } 616 return nullptr; 617 } 618 619 void HeapShared::archive_strings() { 620 oop shared_strings_array = StringTable::init_shared_strings_array(); 621 bool success = archive_reachable_objects_from(1, _dump_time_special_subgraph, shared_strings_array); 622 assert(success, "shared strings array must not point to arrays or strings that are too large to archive"); 623 StringTable::set_shared_strings_array_index(append_root(shared_strings_array)); 624 } 625 626 int HeapShared::archive_exception_instance(oop exception) { 627 bool success = archive_reachable_objects_from(1, _dump_time_special_subgraph, exception); 628 assert(success, "sanity"); 629 return append_root(exception); 630 } 631 632 void HeapShared::mark_native_pointers(oop orig_obj) { 633 if (java_lang_Class::is_instance(orig_obj)) { 634 ArchiveHeapWriter::mark_native_pointer(orig_obj, java_lang_Class::klass_offset()); 635 ArchiveHeapWriter::mark_native_pointer(orig_obj, java_lang_Class::array_klass_offset()); 636 } else if (java_lang_invoke_ResolvedMethodName::is_instance(orig_obj)) { 637 ArchiveHeapWriter::mark_native_pointer(orig_obj, java_lang_invoke_ResolvedMethodName::vmtarget_offset()); 638 } 639 } 640 641 void HeapShared::get_pointer_info(oop src_obj, bool& has_oop_pointers, bool& has_native_pointers) { 642 CachedOopInfo* info = archived_object_cache()->get(src_obj); 643 assert(info != nullptr, "must be"); 644 has_oop_pointers = info->has_oop_pointers(); 645 has_native_pointers = info->has_native_pointers(); 646 } 647 648 void HeapShared::set_has_native_pointers(oop src_obj) { 649 CachedOopInfo* info = archived_object_cache()->get(src_obj); 650 assert(info != nullptr, "must be"); 651 info->set_has_native_pointers(); 652 } 653 654 // Between start_scanning_for_oops() and end_scanning_for_oops(), we discover all Java heap objects that 655 // should be stored in the AOT cache. The scanning is coordinated by AOTArtifactFinder. 656 void HeapShared::start_scanning_for_oops() { 657 { 658 NoSafepointVerifier nsv; 659 660 // The special subgraph doesn't belong to any class. We use Object_klass() here just 661 // for convenience. 662 _dump_time_special_subgraph = init_subgraph_info(vmClasses::Object_klass(), false); 663 664 // Cache for recording where the archived objects are copied to 665 create_archived_object_cache(); 666 667 if (UseCompressedOops || UseG1GC) { 668 aot_log_info(aot)("Heap range = [" PTR_FORMAT " - " PTR_FORMAT "]", 669 UseCompressedOops ? p2i(CompressedOops::begin()) : 670 p2i((address)G1CollectedHeap::heap()->reserved().start()), 671 UseCompressedOops ? p2i(CompressedOops::end()) : 672 p2i((address)G1CollectedHeap::heap()->reserved().end())); 673 } 674 675 archive_subgraphs(); 676 } 677 678 init_seen_objects_table(); 679 Universe::archive_exception_instances(); 680 } 681 682 void HeapShared::end_scanning_for_oops() { 683 archive_strings(); 684 delete_seen_objects_table(); 685 } 686 687 void HeapShared::write_heap(ArchiveHeapInfo *heap_info) { 688 { 689 NoSafepointVerifier nsv; 690 CDSHeapVerifier::verify(); 691 check_special_subgraph_classes(); 692 } 693 694 StringTable::write_shared_table(); 695 ArchiveHeapWriter::write(_pending_roots, heap_info); 696 697 ArchiveBuilder::OtherROAllocMark mark; 698 write_subgraph_info_table(); 699 } 700 701 void HeapShared::scan_java_mirror(oop orig_mirror) { 702 oop m = scratch_java_mirror(orig_mirror); 703 if (m != nullptr) { // nullptr if for custom class loader 704 copy_java_mirror_hashcode(orig_mirror, m); 705 bool success = archive_reachable_objects_from(1, _dump_time_special_subgraph, m); 706 assert(success, "sanity"); 707 } 708 } 709 710 void HeapShared::scan_java_class(Klass* orig_k) { 711 scan_java_mirror(orig_k->java_mirror()); 712 713 if (orig_k->is_instance_klass()) { 714 InstanceKlass* orig_ik = InstanceKlass::cast(orig_k); 715 orig_ik->constants()->prepare_resolved_references_for_archiving(); 716 objArrayOop rr = get_archived_resolved_references(orig_ik); 717 if (rr != nullptr) { 718 bool success = HeapShared::archive_reachable_objects_from(1, _dump_time_special_subgraph, rr); 719 assert(success, "must be"); 720 } 721 } 722 } 723 724 void HeapShared::archive_subgraphs() { 725 assert(CDSConfig::is_dumping_heap(), "must be"); 726 727 archive_object_subgraphs(archive_subgraph_entry_fields, 728 false /* is_full_module_graph */); 729 730 if (CDSConfig::is_dumping_full_module_graph()) { 731 archive_object_subgraphs(fmg_archive_subgraph_entry_fields, 732 true /* is_full_module_graph */); 733 Modules::verify_archived_modules(); 734 } 735 } 736 737 // 738 // Subgraph archiving support 739 // 740 HeapShared::DumpTimeKlassSubGraphInfoTable* HeapShared::_dump_time_subgraph_info_table = nullptr; 741 HeapShared::RunTimeKlassSubGraphInfoTable HeapShared::_run_time_subgraph_info_table; 742 743 // Get the subgraph_info for Klass k. A new subgraph_info is created if 744 // there is no existing one for k. The subgraph_info records the "buffered" 745 // address of the class. 746 KlassSubGraphInfo* HeapShared::init_subgraph_info(Klass* k, bool is_full_module_graph) { 747 assert(CDSConfig::is_dumping_heap(), "dump time only"); 748 bool created; 749 KlassSubGraphInfo* info = 750 _dump_time_subgraph_info_table->put_if_absent(k, KlassSubGraphInfo(k, is_full_module_graph), 751 &created); 752 assert(created, "must not initialize twice"); 753 return info; 754 } 755 756 KlassSubGraphInfo* HeapShared::get_subgraph_info(Klass* k) { 757 assert(CDSConfig::is_dumping_heap(), "dump time only"); 758 KlassSubGraphInfo* info = _dump_time_subgraph_info_table->get(k); 759 assert(info != nullptr, "must have been initialized"); 760 return info; 761 } 762 763 // Add an entry field to the current KlassSubGraphInfo. 764 void KlassSubGraphInfo::add_subgraph_entry_field(int static_field_offset, oop v) { 765 assert(CDSConfig::is_dumping_heap(), "dump time only"); 766 if (_subgraph_entry_fields == nullptr) { 767 _subgraph_entry_fields = 768 new (mtClass) GrowableArray<int>(10, mtClass); 769 } 770 _subgraph_entry_fields->append(static_field_offset); 771 _subgraph_entry_fields->append(HeapShared::append_root(v)); 772 } 773 774 // Add the Klass* for an object in the current KlassSubGraphInfo's subgraphs. 775 // Only objects of boot classes can be included in sub-graph. 776 void KlassSubGraphInfo::add_subgraph_object_klass(Klass* orig_k) { 777 assert(CDSConfig::is_dumping_heap(), "dump time only"); 778 779 if (_subgraph_object_klasses == nullptr) { 780 _subgraph_object_klasses = 781 new (mtClass) GrowableArray<Klass*>(50, mtClass); 782 } 783 784 if (_k == orig_k) { 785 // Don't add the Klass containing the sub-graph to it's own klass 786 // initialization list. 787 return; 788 } 789 790 if (orig_k->is_instance_klass()) { 791 #ifdef ASSERT 792 InstanceKlass* ik = InstanceKlass::cast(orig_k); 793 if (CDSConfig::is_dumping_method_handles()) { 794 // -XX:AOTInitTestClass must be used carefully in regression tests to 795 // include only classes that are safe to aot-initialize. 796 assert(ik->class_loader() == nullptr || 797 HeapShared::is_lambda_proxy_klass(ik) || 798 AOTClassInitializer::has_test_class(), 799 "we can archive only instances of boot classes or lambda proxy classes"); 800 } else { 801 assert(ik->class_loader() == nullptr, "must be boot class"); 802 } 803 #endif 804 // vmClasses::xxx_klass() are not updated, need to check 805 // the original Klass* 806 if (orig_k == vmClasses::String_klass() || 807 orig_k == vmClasses::Object_klass()) { 808 // Initialized early during VM initialization. No need to be added 809 // to the sub-graph object class list. 810 return; 811 } 812 check_allowed_klass(InstanceKlass::cast(orig_k)); 813 } else if (orig_k->is_objArray_klass()) { 814 Klass* abk = ObjArrayKlass::cast(orig_k)->bottom_klass(); 815 if (abk->is_instance_klass()) { 816 assert(InstanceKlass::cast(abk)->defined_by_boot_loader(), 817 "must be boot class"); 818 check_allowed_klass(InstanceKlass::cast(ObjArrayKlass::cast(orig_k)->bottom_klass())); 819 } 820 if (orig_k == Universe::objectArrayKlass()) { 821 // Initialized early during Universe::genesis. No need to be added 822 // to the list. 823 return; 824 } 825 } else { 826 assert(orig_k->is_typeArray_klass(), "must be"); 827 // Primitive type arrays are created early during Universe::genesis. 828 return; 829 } 830 831 if (log_is_enabled(Debug, aot, heap)) { 832 if (!_subgraph_object_klasses->contains(orig_k)) { 833 ResourceMark rm; 834 log_debug(aot, heap)("Adding klass %s", orig_k->external_name()); 835 } 836 } 837 838 _subgraph_object_klasses->append_if_missing(orig_k); 839 _has_non_early_klasses |= is_non_early_klass(orig_k); 840 } 841 842 void KlassSubGraphInfo::check_allowed_klass(InstanceKlass* ik) { 843 #ifndef PRODUCT 844 if (AOTClassInitializer::has_test_class()) { 845 // The tests can cache arbitrary types of objects. 846 return; 847 } 848 #endif 849 850 if (ik->module()->name() == vmSymbols::java_base()) { 851 assert(ik->package() != nullptr, "classes in java.base cannot be in unnamed package"); 852 return; 853 } 854 855 const char* lambda_msg = ""; 856 if (CDSConfig::is_dumping_method_handles()) { 857 lambda_msg = ", or a lambda proxy class"; 858 if (HeapShared::is_lambda_proxy_klass(ik) && 859 (ik->class_loader() == nullptr || 860 ik->class_loader() == SystemDictionary::java_platform_loader() || 861 ik->class_loader() == SystemDictionary::java_system_loader())) { 862 return; 863 } 864 } 865 866 #ifndef PRODUCT 867 if (!ik->module()->is_named() && ik->package() == nullptr && ArchiveHeapTestClass != nullptr) { 868 // This class is loaded by ArchiveHeapTestClass 869 return; 870 } 871 const char* testcls_msg = ", or a test class in an unnamed package of an unnamed module"; 872 #else 873 const char* testcls_msg = ""; 874 #endif 875 876 ResourceMark rm; 877 log_error(aot, heap)("Class %s not allowed in archive heap. Must be in java.base%s%s", 878 ik->external_name(), lambda_msg, testcls_msg); 879 MetaspaceShared::unrecoverable_writing_error(); 880 } 881 882 bool KlassSubGraphInfo::is_non_early_klass(Klass* k) { 883 if (k->is_objArray_klass()) { 884 k = ObjArrayKlass::cast(k)->bottom_klass(); 885 } 886 if (k->is_instance_klass()) { 887 if (!SystemDictionaryShared::is_early_klass(InstanceKlass::cast(k))) { 888 ResourceMark rm; 889 log_info(aot, heap)("non-early: %s", k->external_name()); 890 return true; 891 } else { 892 return false; 893 } 894 } else { 895 return false; 896 } 897 } 898 899 // Initialize an archived subgraph_info_record from the given KlassSubGraphInfo. 900 void ArchivedKlassSubGraphInfoRecord::init(KlassSubGraphInfo* info) { 901 _k = ArchiveBuilder::get_buffered_klass(info->klass()); 902 _entry_field_records = nullptr; 903 _subgraph_object_klasses = nullptr; 904 _is_full_module_graph = info->is_full_module_graph(); 905 906 if (_is_full_module_graph) { 907 // Consider all classes referenced by the full module graph as early -- we will be 908 // allocating objects of these classes during JVMTI early phase, so they cannot 909 // be processed by (non-early) JVMTI ClassFileLoadHook 910 _has_non_early_klasses = false; 911 } else { 912 _has_non_early_klasses = info->has_non_early_klasses(); 913 } 914 915 if (_has_non_early_klasses) { 916 ResourceMark rm; 917 log_info(aot, heap)( 918 "Subgraph of klass %s has non-early klasses and cannot be used when JVMTI ClassFileLoadHook is enabled", 919 _k->external_name()); 920 } 921 922 // populate the entry fields 923 GrowableArray<int>* entry_fields = info->subgraph_entry_fields(); 924 if (entry_fields != nullptr) { 925 int num_entry_fields = entry_fields->length(); 926 assert(num_entry_fields % 2 == 0, "sanity"); 927 _entry_field_records = 928 ArchiveBuilder::new_ro_array<int>(num_entry_fields); 929 for (int i = 0 ; i < num_entry_fields; i++) { 930 _entry_field_records->at_put(i, entry_fields->at(i)); 931 } 932 } 933 934 // <recorded_klasses> has the Klasses of all the objects that are referenced by this subgraph. 935 // Copy those that need to be explicitly initialized into <_subgraph_object_klasses>. 936 GrowableArray<Klass*>* recorded_klasses = info->subgraph_object_klasses(); 937 if (recorded_klasses != nullptr) { 938 // AOT-inited classes are automatically marked as "initialized" during bootstrap. When 939 // programmatically loading a subgraph, we only need to explicitly initialize the classes 940 // that are not aot-inited. 941 int num_to_copy = 0; 942 for (int i = 0; i < recorded_klasses->length(); i++) { 943 Klass* subgraph_k = ArchiveBuilder::get_buffered_klass(recorded_klasses->at(i)); 944 if (!subgraph_k->has_aot_initialized_mirror()) { 945 num_to_copy ++; 946 } 947 } 948 949 _subgraph_object_klasses = ArchiveBuilder::new_ro_array<Klass*>(num_to_copy); 950 bool is_special = (_k == ArchiveBuilder::get_buffered_klass(vmClasses::Object_klass())); 951 for (int i = 0, n = 0; i < recorded_klasses->length(); i++) { 952 Klass* subgraph_k = ArchiveBuilder::get_buffered_klass(recorded_klasses->at(i)); 953 if (subgraph_k->has_aot_initialized_mirror()) { 954 continue; 955 } 956 if (log_is_enabled(Info, aot, heap)) { 957 ResourceMark rm; 958 const char* owner_name = is_special ? "<special>" : _k->external_name(); 959 if (subgraph_k->is_instance_klass()) { 960 InstanceKlass* src_ik = InstanceKlass::cast(ArchiveBuilder::current()->get_source_addr(subgraph_k)); 961 } 962 log_info(aot, heap)( 963 "Archived object klass %s (%2d) => %s", 964 owner_name, n, subgraph_k->external_name()); 965 } 966 _subgraph_object_klasses->at_put(n, subgraph_k); 967 ArchivePtrMarker::mark_pointer(_subgraph_object_klasses->adr_at(n)); 968 n++; 969 } 970 } 971 972 ArchivePtrMarker::mark_pointer(&_k); 973 ArchivePtrMarker::mark_pointer(&_entry_field_records); 974 ArchivePtrMarker::mark_pointer(&_subgraph_object_klasses); 975 } 976 977 class HeapShared::CopyKlassSubGraphInfoToArchive : StackObj { 978 CompactHashtableWriter* _writer; 979 public: 980 CopyKlassSubGraphInfoToArchive(CompactHashtableWriter* writer) : _writer(writer) {} 981 982 bool do_entry(Klass* klass, KlassSubGraphInfo& info) { 983 if (info.subgraph_object_klasses() != nullptr || info.subgraph_entry_fields() != nullptr) { 984 ArchivedKlassSubGraphInfoRecord* record = HeapShared::archive_subgraph_info(&info); 985 Klass* buffered_k = ArchiveBuilder::get_buffered_klass(klass); 986 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary((address)buffered_k); 987 u4 delta = ArchiveBuilder::current()->any_to_offset_u4(record); 988 _writer->add(hash, delta); 989 } 990 return true; // keep on iterating 991 } 992 }; 993 994 ArchivedKlassSubGraphInfoRecord* HeapShared::archive_subgraph_info(KlassSubGraphInfo* info) { 995 ArchivedKlassSubGraphInfoRecord* record = 996 (ArchivedKlassSubGraphInfoRecord*)ArchiveBuilder::ro_region_alloc(sizeof(ArchivedKlassSubGraphInfoRecord)); 997 record->init(info); 998 if (info == _dump_time_special_subgraph) { 999 _run_time_special_subgraph = record; 1000 } 1001 return record; 1002 } 1003 1004 // Build the records of archived subgraph infos, which include: 1005 // - Entry points to all subgraphs from the containing class mirror. The entry 1006 // points are static fields in the mirror. For each entry point, the field 1007 // offset, and value are recorded in the sub-graph 1008 // info. The value is stored back to the corresponding field at runtime. 1009 // - A list of klasses that need to be loaded/initialized before archived 1010 // java object sub-graph can be accessed at runtime. 1011 void HeapShared::write_subgraph_info_table() { 1012 // Allocate the contents of the hashtable(s) inside the RO region of the CDS archive. 1013 DumpTimeKlassSubGraphInfoTable* d_table = _dump_time_subgraph_info_table; 1014 CompactHashtableStats stats; 1015 1016 _run_time_subgraph_info_table.reset(); 1017 1018 CompactHashtableWriter writer(d_table->_count, &stats); 1019 CopyKlassSubGraphInfoToArchive copy(&writer); 1020 d_table->iterate(©); 1021 writer.dump(&_run_time_subgraph_info_table, "subgraphs"); 1022 1023 #ifndef PRODUCT 1024 if (ArchiveHeapTestClass != nullptr) { 1025 size_t len = strlen(ArchiveHeapTestClass) + 1; 1026 Array<char>* array = ArchiveBuilder::new_ro_array<char>((int)len); 1027 strncpy(array->adr_at(0), ArchiveHeapTestClass, len); 1028 _archived_ArchiveHeapTestClass = array; 1029 } 1030 #endif 1031 if (log_is_enabled(Info, aot, heap)) { 1032 print_stats(); 1033 } 1034 } 1035 1036 void HeapShared::add_root_segment(objArrayOop segment_oop) { 1037 assert(segment_oop != nullptr, "must be"); 1038 assert(ArchiveHeapLoader::is_in_use(), "must be"); 1039 if (_root_segments == nullptr) { 1040 _root_segments = new GrowableArrayCHeap<OopHandle, mtClassShared>(10); 1041 } 1042 _root_segments->push(OopHandle(Universe::vm_global(), segment_oop)); 1043 } 1044 1045 void HeapShared::init_root_segment_sizes(int max_size_elems) { 1046 _root_segment_max_size_elems = max_size_elems; 1047 } 1048 1049 void HeapShared::serialize_tables(SerializeClosure* soc) { 1050 1051 #ifndef PRODUCT 1052 soc->do_ptr(&_archived_ArchiveHeapTestClass); 1053 if (soc->reading() && _archived_ArchiveHeapTestClass != nullptr) { 1054 _test_class_name = _archived_ArchiveHeapTestClass->adr_at(0); 1055 setup_test_class(_test_class_name); 1056 } 1057 #endif 1058 1059 _run_time_subgraph_info_table.serialize_header(soc); 1060 soc->do_ptr(&_run_time_special_subgraph); 1061 } 1062 1063 static void verify_the_heap(Klass* k, const char* which) { 1064 if (VerifyArchivedFields > 0) { 1065 ResourceMark rm; 1066 log_info(aot, heap)("Verify heap %s initializing static field(s) in %s", 1067 which, k->external_name()); 1068 1069 VM_Verify verify_op; 1070 VMThread::execute(&verify_op); 1071 1072 if (VerifyArchivedFields > 1 && is_init_completed()) { 1073 // At this time, the oop->klass() of some archived objects in the heap may not 1074 // have been loaded into the system dictionary yet. Nevertheless, oop->klass() should 1075 // have enough information (object size, oop maps, etc) so that a GC can be safely 1076 // performed. 1077 // 1078 // -XX:VerifyArchivedFields=2 force a GC to happen in such an early stage 1079 // to check for GC safety. 1080 log_info(aot, heap)("Trigger GC %s initializing static field(s) in %s", 1081 which, k->external_name()); 1082 FlagSetting fs1(VerifyBeforeGC, true); 1083 FlagSetting fs2(VerifyDuringGC, true); 1084 FlagSetting fs3(VerifyAfterGC, true); 1085 Universe::heap()->collect(GCCause::_java_lang_system_gc); 1086 } 1087 } 1088 } 1089 1090 // Before GC can execute, we must ensure that all oops reachable from HeapShared::roots() 1091 // have a valid klass. I.e., oopDesc::klass() must have already been resolved. 1092 // 1093 // Note: if a ArchivedKlassSubGraphInfoRecord contains non-early classes, and JVMTI 1094 // ClassFileLoadHook is enabled, it's possible for this class to be dynamically replaced. In 1095 // this case, we will not load the ArchivedKlassSubGraphInfoRecord and will clear its roots. 1096 void HeapShared::resolve_classes(JavaThread* current) { 1097 assert(CDSConfig::is_using_archive(), "runtime only!"); 1098 if (!ArchiveHeapLoader::is_in_use()) { 1099 return; // nothing to do 1100 } 1101 resolve_classes_for_subgraphs(current, archive_subgraph_entry_fields); 1102 resolve_classes_for_subgraphs(current, fmg_archive_subgraph_entry_fields); 1103 } 1104 1105 void HeapShared::resolve_classes_for_subgraphs(JavaThread* current, ArchivableStaticFieldInfo fields[]) { 1106 for (int i = 0; fields[i].valid(); i++) { 1107 ArchivableStaticFieldInfo* info = &fields[i]; 1108 TempNewSymbol klass_name = SymbolTable::new_symbol(info->klass_name); 1109 InstanceKlass* k = SystemDictionaryShared::find_builtin_class(klass_name); 1110 assert(k != nullptr && k->defined_by_boot_loader(), "sanity"); 1111 resolve_classes_for_subgraph_of(current, k); 1112 } 1113 } 1114 1115 void HeapShared::resolve_classes_for_subgraph_of(JavaThread* current, Klass* k) { 1116 JavaThread* THREAD = current; 1117 ExceptionMark em(THREAD); 1118 const ArchivedKlassSubGraphInfoRecord* record = 1119 resolve_or_init_classes_for_subgraph_of(k, /*do_init=*/false, THREAD); 1120 if (HAS_PENDING_EXCEPTION) { 1121 CLEAR_PENDING_EXCEPTION; 1122 } 1123 if (record == nullptr) { 1124 clear_archived_roots_of(k); 1125 } 1126 } 1127 1128 void HeapShared::initialize_java_lang_invoke(TRAPS) { 1129 if (CDSConfig::is_using_aot_linked_classes() || CDSConfig::is_dumping_method_handles()) { 1130 resolve_or_init("java/lang/invoke/Invokers$Holder", true, CHECK); 1131 resolve_or_init("java/lang/invoke/MethodHandle", true, CHECK); 1132 resolve_or_init("java/lang/invoke/MethodHandleNatives", true, CHECK); 1133 resolve_or_init("java/lang/invoke/DirectMethodHandle$Holder", true, CHECK); 1134 resolve_or_init("java/lang/invoke/DelegatingMethodHandle$Holder", true, CHECK); 1135 resolve_or_init("java/lang/invoke/LambdaForm$Holder", true, CHECK); 1136 resolve_or_init("java/lang/invoke/BoundMethodHandle$Species_L", true, CHECK); 1137 } 1138 } 1139 1140 // Initialize the InstanceKlasses of objects that are reachable from the following roots: 1141 // - interned strings 1142 // - Klass::java_mirror() -- including aot-initialized mirrors such as those of Enum klasses. 1143 // - ConstantPool::resolved_references() 1144 // - Universe::<xxx>_exception_instance() 1145 // 1146 // For example, if this enum class is initialized at AOT cache assembly time: 1147 // 1148 // enum Fruit { 1149 // APPLE, ORANGE, BANANA; 1150 // static final Set<Fruit> HAVE_SEEDS = new HashSet<>(Arrays.asList(APPLE, ORANGE)); 1151 // } 1152 // 1153 // the aot-initialized mirror of Fruit has a static field that references HashSet, which 1154 // should be initialized before any Java code can access the Fruit class. Note that 1155 // HashSet itself doesn't necessary need to be an aot-initialized class. 1156 void HeapShared::init_classes_for_special_subgraph(Handle class_loader, TRAPS) { 1157 if (!ArchiveHeapLoader::is_in_use()) { 1158 return; 1159 } 1160 1161 assert( _run_time_special_subgraph != nullptr, "must be"); 1162 Array<Klass*>* klasses = _run_time_special_subgraph->subgraph_object_klasses(); 1163 if (klasses != nullptr) { 1164 for (int pass = 0; pass < 2; pass ++) { 1165 for (int i = 0; i < klasses->length(); i++) { 1166 Klass* k = klasses->at(i); 1167 if (k->class_loader_data() == nullptr) { 1168 // This class is not yet loaded. We will initialize it in a later phase. 1169 // For example, we have loaded only AOTLinkedClassCategory::BOOT1 classes 1170 // but k is part of AOTLinkedClassCategory::BOOT2. 1171 continue; 1172 } 1173 if (k->class_loader() == class_loader()) { 1174 if (pass == 0) { 1175 if (k->is_instance_klass()) { 1176 InstanceKlass::cast(k)->link_class(CHECK); 1177 } 1178 } else { 1179 resolve_or_init(k, /*do_init*/true, CHECK); 1180 } 1181 } 1182 } 1183 } 1184 } 1185 } 1186 1187 void HeapShared::initialize_from_archived_subgraph(JavaThread* current, Klass* k) { 1188 JavaThread* THREAD = current; 1189 if (!ArchiveHeapLoader::is_in_use()) { 1190 return; // nothing to do 1191 } 1192 1193 if (k->name()->equals("jdk/internal/module/ArchivedModuleGraph") && 1194 !CDSConfig::is_using_optimized_module_handling() && 1195 // archive was created with --module-path 1196 AOTClassLocationConfig::runtime()->num_module_paths() > 0) { 1197 // ArchivedModuleGraph was created with a --module-path that's different than the runtime --module-path. 1198 // Thus, it might contain references to modules that do not exist at runtime. We cannot use it. 1199 log_info(aot, heap)("Skip initializing ArchivedModuleGraph subgraph: is_using_optimized_module_handling=%s num_module_paths=%d", 1200 BOOL_TO_STR(CDSConfig::is_using_optimized_module_handling()), 1201 AOTClassLocationConfig::runtime()->num_module_paths()); 1202 return; 1203 } 1204 1205 ExceptionMark em(THREAD); 1206 const ArchivedKlassSubGraphInfoRecord* record = 1207 resolve_or_init_classes_for_subgraph_of(k, /*do_init=*/true, THREAD); 1208 1209 if (HAS_PENDING_EXCEPTION) { 1210 CLEAR_PENDING_EXCEPTION; 1211 // None of the field value will be set if there was an exception when initializing the classes. 1212 // The java code will not see any of the archived objects in the 1213 // subgraphs referenced from k in this case. 1214 return; 1215 } 1216 1217 if (record != nullptr) { 1218 init_archived_fields_for(k, record); 1219 } 1220 } 1221 1222 const ArchivedKlassSubGraphInfoRecord* 1223 HeapShared::resolve_or_init_classes_for_subgraph_of(Klass* k, bool do_init, TRAPS) { 1224 assert(!CDSConfig::is_dumping_heap(), "Should not be called when dumping heap"); 1225 1226 if (!k->is_shared()) { 1227 return nullptr; 1228 } 1229 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(k); 1230 const ArchivedKlassSubGraphInfoRecord* record = _run_time_subgraph_info_table.lookup(k, hash, 0); 1231 1232 #ifndef PRODUCT 1233 if (_test_class_name != nullptr && k->name()->equals(_test_class_name) && record != nullptr) { 1234 _test_class = k; 1235 _test_class_record = record; 1236 } 1237 #endif 1238 1239 // Initialize from archived data. Currently this is done only 1240 // during VM initialization time. No lock is needed. 1241 if (record == nullptr) { 1242 if (log_is_enabled(Info, aot, heap)) { 1243 ResourceMark rm(THREAD); 1244 log_info(aot, heap)("subgraph %s is not recorded", 1245 k->external_name()); 1246 } 1247 return nullptr; 1248 } else { 1249 if (record->is_full_module_graph() && !CDSConfig::is_using_full_module_graph()) { 1250 if (log_is_enabled(Info, aot, heap)) { 1251 ResourceMark rm(THREAD); 1252 log_info(aot, heap)("subgraph %s cannot be used because full module graph is disabled", 1253 k->external_name()); 1254 } 1255 return nullptr; 1256 } 1257 1258 if (record->has_non_early_klasses() && JvmtiExport::should_post_class_file_load_hook()) { 1259 if (log_is_enabled(Info, aot, heap)) { 1260 ResourceMark rm(THREAD); 1261 log_info(aot, heap)("subgraph %s cannot be used because JVMTI ClassFileLoadHook is enabled", 1262 k->external_name()); 1263 } 1264 return nullptr; 1265 } 1266 1267 if (log_is_enabled(Info, aot, heap)) { 1268 ResourceMark rm; 1269 log_info(aot, heap)("%s subgraph %s ", do_init ? "init" : "resolve", k->external_name()); 1270 } 1271 1272 resolve_or_init(k, do_init, CHECK_NULL); 1273 1274 // Load/link/initialize the klasses of the objects in the subgraph. 1275 // nullptr class loader is used. 1276 Array<Klass*>* klasses = record->subgraph_object_klasses(); 1277 if (klasses != nullptr) { 1278 for (int i = 0; i < klasses->length(); i++) { 1279 Klass* klass = klasses->at(i); 1280 if (!klass->is_shared()) { 1281 return nullptr; 1282 } 1283 resolve_or_init(klass, do_init, CHECK_NULL); 1284 } 1285 } 1286 } 1287 1288 return record; 1289 } 1290 1291 void HeapShared::resolve_or_init(const char* klass_name, bool do_init, TRAPS) { 1292 TempNewSymbol klass_name_sym = SymbolTable::new_symbol(klass_name); 1293 InstanceKlass* k = SystemDictionaryShared::find_builtin_class(klass_name_sym); 1294 if (k == nullptr) { 1295 return; 1296 } 1297 assert(k->defined_by_boot_loader(), "sanity"); 1298 resolve_or_init(k, false, CHECK); 1299 if (do_init) { 1300 resolve_or_init(k, true, CHECK); 1301 } 1302 } 1303 1304 void HeapShared::resolve_or_init(Klass* k, bool do_init, TRAPS) { 1305 if (!do_init) { 1306 if (k->class_loader_data() == nullptr) { 1307 Klass* resolved_k = SystemDictionary::resolve_or_null(k->name(), CHECK); 1308 assert(resolved_k == k, "classes used by archived heap must not be replaced by JVMTI ClassFileLoadHook"); 1309 } 1310 } else { 1311 assert(k->class_loader_data() != nullptr, "must have been resolved by HeapShared::resolve_classes"); 1312 if (k->is_instance_klass()) { 1313 InstanceKlass* ik = InstanceKlass::cast(k); 1314 ik->initialize(CHECK); 1315 } else if (k->is_objArray_klass()) { 1316 ObjArrayKlass* oak = ObjArrayKlass::cast(k); 1317 oak->initialize(CHECK); 1318 } 1319 } 1320 } 1321 1322 void HeapShared::init_archived_fields_for(Klass* k, const ArchivedKlassSubGraphInfoRecord* record) { 1323 verify_the_heap(k, "before"); 1324 1325 // Load the subgraph entry fields from the record and store them back to 1326 // the corresponding fields within the mirror. 1327 oop m = k->java_mirror(); 1328 Array<int>* entry_field_records = record->entry_field_records(); 1329 if (entry_field_records != nullptr) { 1330 int efr_len = entry_field_records->length(); 1331 assert(efr_len % 2 == 0, "sanity"); 1332 for (int i = 0; i < efr_len; i += 2) { 1333 int field_offset = entry_field_records->at(i); 1334 int root_index = entry_field_records->at(i+1); 1335 oop v = get_root(root_index, /*clear=*/true); 1336 if (k->has_aot_initialized_mirror()) { 1337 assert(v == m->obj_field(field_offset), "must be aot-initialized"); 1338 } else { 1339 m->obj_field_put(field_offset, v); 1340 } 1341 log_debug(aot, heap)(" " PTR_FORMAT " init field @ %2d = " PTR_FORMAT, p2i(k), field_offset, p2i(v)); 1342 } 1343 1344 // Done. Java code can see the archived sub-graphs referenced from k's 1345 // mirror after this point. 1346 if (log_is_enabled(Info, aot, heap)) { 1347 ResourceMark rm; 1348 log_info(aot, heap)("initialize_from_archived_subgraph %s " PTR_FORMAT "%s%s", 1349 k->external_name(), p2i(k), JvmtiExport::is_early_phase() ? " (early)" : "", 1350 k->has_aot_initialized_mirror() ? " (aot-inited)" : ""); 1351 } 1352 } 1353 1354 verify_the_heap(k, "after "); 1355 } 1356 1357 void HeapShared::clear_archived_roots_of(Klass* k) { 1358 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(k); 1359 const ArchivedKlassSubGraphInfoRecord* record = _run_time_subgraph_info_table.lookup(k, hash, 0); 1360 if (record != nullptr) { 1361 Array<int>* entry_field_records = record->entry_field_records(); 1362 if (entry_field_records != nullptr) { 1363 int efr_len = entry_field_records->length(); 1364 assert(efr_len % 2 == 0, "sanity"); 1365 for (int i = 0; i < efr_len; i += 2) { 1366 int root_index = entry_field_records->at(i+1); 1367 clear_root(root_index); 1368 } 1369 } 1370 } 1371 } 1372 1373 // Push all oop fields (or oop array elemenets in case of an objArray) in 1374 // _referencing_obj onto the _stack. 1375 class HeapShared::OopFieldPusher: public BasicOopIterateClosure { 1376 PendingOopStack* _stack; 1377 GrowableArray<oop> _found_oop_fields; 1378 int _level; 1379 bool _record_klasses_only; 1380 KlassSubGraphInfo* _subgraph_info; 1381 oop _referencing_obj; 1382 bool _is_java_lang_ref; 1383 public: 1384 OopFieldPusher(PendingOopStack* stack, 1385 int level, 1386 bool record_klasses_only, 1387 KlassSubGraphInfo* subgraph_info, 1388 oop orig) : 1389 _stack(stack), 1390 _found_oop_fields(), 1391 _level(level), 1392 _record_klasses_only(record_klasses_only), 1393 _subgraph_info(subgraph_info), 1394 _referencing_obj(orig) { 1395 _is_java_lang_ref = AOTReferenceObjSupport::check_if_ref_obj(orig); 1396 } 1397 void do_oop(narrowOop *p) { OopFieldPusher::do_oop_work(p); } 1398 void do_oop( oop *p) { OopFieldPusher::do_oop_work(p); } 1399 1400 ~OopFieldPusher() { 1401 while (_found_oop_fields.length() > 0) { 1402 // This produces the exact same traversal order as the previous version 1403 // of OopFieldPusher that recurses on the C stack -- a depth-first search, 1404 // walking the oop fields in _referencing_obj by ascending field offsets. 1405 oop obj = _found_oop_fields.pop(); 1406 _stack->push(PendingOop(obj, _referencing_obj, _level + 1)); 1407 } 1408 } 1409 1410 protected: 1411 template <class T> void do_oop_work(T *p) { 1412 int field_offset = pointer_delta_as_int((char*)p, cast_from_oop<char*>(_referencing_obj)); 1413 oop obj = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_load_at(_referencing_obj, field_offset); 1414 if (!CompressedOops::is_null(obj)) { 1415 if (_is_java_lang_ref && AOTReferenceObjSupport::skip_field(field_offset)) { 1416 // Do not follow these fields. They will be cleared to null. 1417 return; 1418 } 1419 1420 if (!_record_klasses_only && log_is_enabled(Debug, aot, heap)) { 1421 ResourceMark rm; 1422 log_debug(aot, heap)("(%d) %s[%d] ==> " PTR_FORMAT " size %zu %s", _level, 1423 _referencing_obj->klass()->external_name(), field_offset, 1424 p2i(obj), obj->size() * HeapWordSize, obj->klass()->external_name()); 1425 if (log_is_enabled(Trace, aot, heap)) { 1426 LogTarget(Trace, aot, heap) log; 1427 LogStream out(log); 1428 obj->print_on(&out); 1429 } 1430 } 1431 1432 _found_oop_fields.push(obj); 1433 } 1434 } 1435 1436 public: 1437 oop referencing_obj() { return _referencing_obj; } 1438 KlassSubGraphInfo* subgraph_info() { return _subgraph_info; } 1439 }; 1440 1441 // Checks if an oop has any non-null oop fields 1442 class PointsToOopsChecker : public BasicOopIterateClosure { 1443 bool _result; 1444 1445 template <class T> void check(T *p) { 1446 _result |= (HeapAccess<>::oop_load(p) != nullptr); 1447 } 1448 1449 public: 1450 PointsToOopsChecker() : _result(false) {} 1451 void do_oop(narrowOop *p) { check(p); } 1452 void do_oop( oop *p) { check(p); } 1453 bool result() { return _result; } 1454 }; 1455 1456 HeapShared::CachedOopInfo HeapShared::make_cached_oop_info(oop obj, oop referrer) { 1457 PointsToOopsChecker points_to_oops_checker; 1458 obj->oop_iterate(&points_to_oops_checker); 1459 return CachedOopInfo(referrer, points_to_oops_checker.result()); 1460 } 1461 1462 void HeapShared::init_box_classes(TRAPS) { 1463 if (ArchiveHeapLoader::is_in_use()) { 1464 vmClasses::Boolean_klass()->initialize(CHECK); 1465 vmClasses::Character_klass()->initialize(CHECK); 1466 vmClasses::Float_klass()->initialize(CHECK); 1467 vmClasses::Double_klass()->initialize(CHECK); 1468 vmClasses::Byte_klass()->initialize(CHECK); 1469 vmClasses::Short_klass()->initialize(CHECK); 1470 vmClasses::Integer_klass()->initialize(CHECK); 1471 vmClasses::Long_klass()->initialize(CHECK); 1472 vmClasses::Void_klass()->initialize(CHECK); 1473 } 1474 } 1475 1476 // (1) If orig_obj has not been archived yet, archive it. 1477 // (2) If orig_obj has not been seen yet (since start_recording_subgraph() was called), 1478 // trace all objects that are reachable from it, and make sure these objects are archived. 1479 // (3) Record the klasses of all objects that are reachable from orig_obj (including those that 1480 // were already archived when this function is called) 1481 bool HeapShared::archive_reachable_objects_from(int level, 1482 KlassSubGraphInfo* subgraph_info, 1483 oop orig_obj) { 1484 assert(orig_obj != nullptr, "must be"); 1485 PendingOopStack stack; 1486 stack.push(PendingOop(orig_obj, nullptr, level)); 1487 1488 while (stack.length() > 0) { 1489 PendingOop po = stack.pop(); 1490 _object_being_archived = po; 1491 bool status = walk_one_object(&stack, po.level(), subgraph_info, po.obj(), po.referrer()); 1492 _object_being_archived = PendingOop(); 1493 1494 if (!status) { 1495 // Don't archive a subgraph root that's too big. For archives static fields, that's OK 1496 // as the Java code will take care of initializing this field dynamically. 1497 assert(level == 1, "VM should have exited with unarchivable objects for _level > 1"); 1498 return false; 1499 } 1500 } 1501 1502 return true; 1503 } 1504 1505 bool HeapShared::walk_one_object(PendingOopStack* stack, int level, KlassSubGraphInfo* subgraph_info, 1506 oop orig_obj, oop referrer) { 1507 assert(orig_obj != nullptr, "must be"); 1508 if (!JavaClasses::is_supported_for_archiving(orig_obj)) { 1509 // This object has injected fields that cannot be supported easily, so we disallow them for now. 1510 // If you get an error here, you probably made a change in the JDK library that has added 1511 // these objects that are referenced (directly or indirectly) by static fields. 1512 ResourceMark rm; 1513 log_error(aot, heap)("Cannot archive object " PTR_FORMAT " of class %s", p2i(orig_obj), orig_obj->klass()->external_name()); 1514 debug_trace(); 1515 MetaspaceShared::unrecoverable_writing_error(); 1516 } 1517 1518 if (log_is_enabled(Debug, aot, heap) && java_lang_Class::is_instance(orig_obj)) { 1519 ResourceMark rm; 1520 LogTarget(Debug, aot, heap) log; 1521 LogStream out(log); 1522 out.print("Found java mirror " PTR_FORMAT " ", p2i(orig_obj)); 1523 Klass* k = java_lang_Class::as_Klass(orig_obj); 1524 if (k != nullptr) { 1525 out.print("%s", k->external_name()); 1526 } else { 1527 out.print("primitive"); 1528 } 1529 out.print_cr("; scratch mirror = " PTR_FORMAT, 1530 p2i(scratch_java_mirror(orig_obj))); 1531 } 1532 1533 if (java_lang_Class::is_instance(orig_obj)) { 1534 Klass* k = java_lang_Class::as_Klass(orig_obj); 1535 if (RegeneratedClasses::has_been_regenerated(k)) { 1536 orig_obj = RegeneratedClasses::get_regenerated_object(k)->java_mirror(); 1537 } 1538 } 1539 1540 if (CDSConfig::is_initing_classes_at_dump_time()) { 1541 if (java_lang_Class::is_instance(orig_obj)) { 1542 orig_obj = scratch_java_mirror(orig_obj); 1543 assert(orig_obj != nullptr, "must be archived"); 1544 } 1545 } else if (java_lang_Class::is_instance(orig_obj) && subgraph_info != _dump_time_special_subgraph) { 1546 // Without CDSConfig::is_initing_classes_at_dump_time(), we only allow archived objects to 1547 // point to the mirrors of (1) j.l.Object, (2) primitive classes, and (3) box classes. These are initialized 1548 // very early by HeapShared::init_box_classes(). 1549 if (orig_obj == vmClasses::Object_klass()->java_mirror() 1550 || java_lang_Class::is_primitive(orig_obj) 1551 || orig_obj == vmClasses::Boolean_klass()->java_mirror() 1552 || orig_obj == vmClasses::Character_klass()->java_mirror() 1553 || orig_obj == vmClasses::Float_klass()->java_mirror() 1554 || orig_obj == vmClasses::Double_klass()->java_mirror() 1555 || orig_obj == vmClasses::Byte_klass()->java_mirror() 1556 || orig_obj == vmClasses::Short_klass()->java_mirror() 1557 || orig_obj == vmClasses::Integer_klass()->java_mirror() 1558 || orig_obj == vmClasses::Long_klass()->java_mirror() 1559 || orig_obj == vmClasses::Void_klass()->java_mirror()) { 1560 orig_obj = scratch_java_mirror(orig_obj); 1561 assert(orig_obj != nullptr, "must be archived"); 1562 } else { 1563 // If you get an error here, you probably made a change in the JDK library that has added a Class 1564 // object that is referenced (directly or indirectly) by an ArchivableStaticFieldInfo 1565 // defined at the top of this file. 1566 log_error(aot, heap)("(%d) Unknown java.lang.Class object is in the archived sub-graph", level); 1567 debug_trace(); 1568 MetaspaceShared::unrecoverable_writing_error(); 1569 } 1570 } 1571 1572 if (has_been_seen_during_subgraph_recording(orig_obj)) { 1573 // orig_obj has already been archived and traced. Nothing more to do. 1574 return true; 1575 } else { 1576 set_has_been_seen_during_subgraph_recording(orig_obj); 1577 } 1578 1579 bool already_archived = has_been_archived(orig_obj); 1580 bool record_klasses_only = already_archived; 1581 if (!already_archived) { 1582 ++_num_new_archived_objs; 1583 if (!archive_object(orig_obj, referrer, subgraph_info)) { 1584 // Skip archiving the sub-graph referenced from the current entry field. 1585 ResourceMark rm; 1586 log_error(aot, heap)( 1587 "Cannot archive the sub-graph referenced from %s object (" 1588 PTR_FORMAT ") size %zu, skipped.", 1589 orig_obj->klass()->external_name(), p2i(orig_obj), orig_obj->size() * HeapWordSize); 1590 if (level == 1) { 1591 // Don't archive a subgraph root that's too big. For archives static fields, that's OK 1592 // as the Java code will take care of initializing this field dynamically. 1593 return false; 1594 } else { 1595 // We don't know how to handle an object that has been archived, but some of its reachable 1596 // objects cannot be archived. Bail out for now. We might need to fix this in the future if 1597 // we have a real use case. 1598 MetaspaceShared::unrecoverable_writing_error(); 1599 } 1600 } 1601 } 1602 1603 Klass *orig_k = orig_obj->klass(); 1604 subgraph_info->add_subgraph_object_klass(orig_k); 1605 1606 { 1607 // Find all the oops that are referenced by orig_obj, push them onto the stack 1608 // so we can work on them next. 1609 ResourceMark rm; 1610 OopFieldPusher pusher(stack, level, record_klasses_only, subgraph_info, orig_obj); 1611 orig_obj->oop_iterate(&pusher); 1612 } 1613 1614 if (CDSConfig::is_initing_classes_at_dump_time()) { 1615 // The enum klasses are archived with aot-initialized mirror. 1616 // See AOTClassInitializer::can_archive_initialized_mirror(). 1617 } else { 1618 if (CDSEnumKlass::is_enum_obj(orig_obj)) { 1619 CDSEnumKlass::handle_enum_obj(level + 1, subgraph_info, orig_obj); 1620 } 1621 } 1622 1623 return true; 1624 } 1625 1626 // 1627 // Start from the given static field in a java mirror and archive the 1628 // complete sub-graph of java heap objects that are reached directly 1629 // or indirectly from the starting object by following references. 1630 // Sub-graph archiving restrictions (current): 1631 // 1632 // - All classes of objects in the archived sub-graph (including the 1633 // entry class) must be boot class only. 1634 // - No java.lang.Class instance (java mirror) can be included inside 1635 // an archived sub-graph. Mirror can only be the sub-graph entry object. 1636 // 1637 // The Java heap object sub-graph archiving process (see OopFieldPusher): 1638 // 1639 // 1) Java object sub-graph archiving starts from a given static field 1640 // within a Class instance (java mirror). If the static field is a 1641 // reference field and points to a non-null java object, proceed to 1642 // the next step. 1643 // 1644 // 2) Archives the referenced java object. If an archived copy of the 1645 // current object already exists, updates the pointer in the archived 1646 // copy of the referencing object to point to the current archived object. 1647 // Otherwise, proceed to the next step. 1648 // 1649 // 3) Follows all references within the current java object and recursively 1650 // archive the sub-graph of objects starting from each reference. 1651 // 1652 // 4) Updates the pointer in the archived copy of referencing object to 1653 // point to the current archived object. 1654 // 1655 // 5) The Klass of the current java object is added to the list of Klasses 1656 // for loading and initializing before any object in the archived graph can 1657 // be accessed at runtime. 1658 // 1659 void HeapShared::archive_reachable_objects_from_static_field(InstanceKlass *k, 1660 const char* klass_name, 1661 int field_offset, 1662 const char* field_name) { 1663 assert(CDSConfig::is_dumping_heap(), "dump time only"); 1664 assert(k->defined_by_boot_loader(), "must be boot class"); 1665 1666 oop m = k->java_mirror(); 1667 1668 KlassSubGraphInfo* subgraph_info = get_subgraph_info(k); 1669 oop f = m->obj_field(field_offset); 1670 1671 log_debug(aot, heap)("Start archiving from: %s::%s (" PTR_FORMAT ")", klass_name, field_name, p2i(f)); 1672 1673 if (!CompressedOops::is_null(f)) { 1674 if (log_is_enabled(Trace, aot, heap)) { 1675 LogTarget(Trace, aot, heap) log; 1676 LogStream out(log); 1677 f->print_on(&out); 1678 } 1679 1680 bool success = archive_reachable_objects_from(1, subgraph_info, f); 1681 if (!success) { 1682 log_error(aot, heap)("Archiving failed %s::%s (some reachable objects cannot be archived)", 1683 klass_name, field_name); 1684 } else { 1685 // Note: the field value is not preserved in the archived mirror. 1686 // Record the field as a new subGraph entry point. The recorded 1687 // information is restored from the archive at runtime. 1688 subgraph_info->add_subgraph_entry_field(field_offset, f); 1689 log_info(aot, heap)("Archived field %s::%s => " PTR_FORMAT, klass_name, field_name, p2i(f)); 1690 } 1691 } else { 1692 // The field contains null, we still need to record the entry point, 1693 // so it can be restored at runtime. 1694 subgraph_info->add_subgraph_entry_field(field_offset, nullptr); 1695 } 1696 } 1697 1698 #ifndef PRODUCT 1699 class VerifySharedOopClosure: public BasicOopIterateClosure { 1700 public: 1701 void do_oop(narrowOop *p) { VerifySharedOopClosure::do_oop_work(p); } 1702 void do_oop( oop *p) { VerifySharedOopClosure::do_oop_work(p); } 1703 1704 protected: 1705 template <class T> void do_oop_work(T *p) { 1706 oop obj = RawAccess<>::oop_load(p); 1707 if (!CompressedOops::is_null(obj)) { 1708 HeapShared::verify_reachable_objects_from(obj); 1709 } 1710 } 1711 }; 1712 1713 void HeapShared::verify_subgraph_from_static_field(InstanceKlass* k, int field_offset) { 1714 assert(CDSConfig::is_dumping_heap(), "dump time only"); 1715 assert(k->defined_by_boot_loader(), "must be boot class"); 1716 1717 oop m = k->java_mirror(); 1718 oop f = m->obj_field(field_offset); 1719 if (!CompressedOops::is_null(f)) { 1720 verify_subgraph_from(f); 1721 } 1722 } 1723 1724 void HeapShared::verify_subgraph_from(oop orig_obj) { 1725 if (!has_been_archived(orig_obj)) { 1726 // It's OK for the root of a subgraph to be not archived. See comments in 1727 // archive_reachable_objects_from(). 1728 return; 1729 } 1730 1731 // Verify that all objects reachable from orig_obj are archived. 1732 init_seen_objects_table(); 1733 verify_reachable_objects_from(orig_obj); 1734 delete_seen_objects_table(); 1735 } 1736 1737 void HeapShared::verify_reachable_objects_from(oop obj) { 1738 _num_total_verifications ++; 1739 if (java_lang_Class::is_instance(obj)) { 1740 obj = scratch_java_mirror(obj); 1741 assert(obj != nullptr, "must be"); 1742 } 1743 if (!has_been_seen_during_subgraph_recording(obj)) { 1744 set_has_been_seen_during_subgraph_recording(obj); 1745 assert(has_been_archived(obj), "must be"); 1746 VerifySharedOopClosure walker; 1747 obj->oop_iterate(&walker); 1748 } 1749 } 1750 #endif 1751 1752 void HeapShared::check_special_subgraph_classes() { 1753 if (CDSConfig::is_initing_classes_at_dump_time()) { 1754 // We can have aot-initialized classes (such as Enums) that can reference objects 1755 // of arbitrary types. Currently, we trust the JEP 483 implementation to only 1756 // aot-initialize classes that are "safe". 1757 // 1758 // TODO: we need an automatic tool that checks the safety of aot-initialized 1759 // classes (when we extend the set of aot-initialized classes beyond JEP 483) 1760 return; 1761 } else { 1762 // In this case, the special subgraph should contain a few specific types 1763 GrowableArray<Klass*>* klasses = _dump_time_special_subgraph->subgraph_object_klasses(); 1764 int num = klasses->length(); 1765 for (int i = 0; i < num; i++) { 1766 Klass* subgraph_k = klasses->at(i); 1767 Symbol* name = subgraph_k->name(); 1768 if (subgraph_k->is_instance_klass() && 1769 name != vmSymbols::java_lang_Class() && 1770 name != vmSymbols::java_lang_String() && 1771 name != vmSymbols::java_lang_ArithmeticException() && 1772 name != vmSymbols::java_lang_ArrayIndexOutOfBoundsException() && 1773 name != vmSymbols::java_lang_ArrayStoreException() && 1774 name != vmSymbols::java_lang_ClassCastException() && 1775 name != vmSymbols::java_lang_InternalError() && 1776 name != vmSymbols::java_lang_NullPointerException()) { 1777 ResourceMark rm; 1778 fatal("special subgraph cannot have objects of type %s", subgraph_k->external_name()); 1779 } 1780 } 1781 } 1782 } 1783 1784 HeapShared::SeenObjectsTable* HeapShared::_seen_objects_table = nullptr; 1785 HeapShared::PendingOop HeapShared::_object_being_archived; 1786 int HeapShared::_num_new_walked_objs; 1787 int HeapShared::_num_new_archived_objs; 1788 int HeapShared::_num_old_recorded_klasses; 1789 1790 int HeapShared::_num_total_subgraph_recordings = 0; 1791 int HeapShared::_num_total_walked_objs = 0; 1792 int HeapShared::_num_total_archived_objs = 0; 1793 int HeapShared::_num_total_recorded_klasses = 0; 1794 int HeapShared::_num_total_verifications = 0; 1795 1796 bool HeapShared::has_been_seen_during_subgraph_recording(oop obj) { 1797 return _seen_objects_table->get(obj) != nullptr; 1798 } 1799 1800 void HeapShared::set_has_been_seen_during_subgraph_recording(oop obj) { 1801 assert(!has_been_seen_during_subgraph_recording(obj), "sanity"); 1802 _seen_objects_table->put_when_absent(obj, true); 1803 _seen_objects_table->maybe_grow(); 1804 ++ _num_new_walked_objs; 1805 } 1806 1807 void HeapShared::start_recording_subgraph(InstanceKlass *k, const char* class_name, bool is_full_module_graph) { 1808 log_info(aot, heap)("Start recording subgraph(s) for archived fields in %s", class_name); 1809 init_subgraph_info(k, is_full_module_graph); 1810 init_seen_objects_table(); 1811 _num_new_walked_objs = 0; 1812 _num_new_archived_objs = 0; 1813 _num_old_recorded_klasses = get_subgraph_info(k)->num_subgraph_object_klasses(); 1814 } 1815 1816 void HeapShared::done_recording_subgraph(InstanceKlass *k, const char* class_name) { 1817 int num_new_recorded_klasses = get_subgraph_info(k)->num_subgraph_object_klasses() - 1818 _num_old_recorded_klasses; 1819 log_info(aot, heap)("Done recording subgraph(s) for archived fields in %s: " 1820 "walked %d objs, archived %d new objs, recorded %d classes", 1821 class_name, _num_new_walked_objs, _num_new_archived_objs, 1822 num_new_recorded_klasses); 1823 1824 delete_seen_objects_table(); 1825 1826 _num_total_subgraph_recordings ++; 1827 _num_total_walked_objs += _num_new_walked_objs; 1828 _num_total_archived_objs += _num_new_archived_objs; 1829 _num_total_recorded_klasses += num_new_recorded_klasses; 1830 } 1831 1832 class ArchivableStaticFieldFinder: public FieldClosure { 1833 InstanceKlass* _ik; 1834 Symbol* _field_name; 1835 bool _found; 1836 int _offset; 1837 public: 1838 ArchivableStaticFieldFinder(InstanceKlass* ik, Symbol* field_name) : 1839 _ik(ik), _field_name(field_name), _found(false), _offset(-1) {} 1840 1841 virtual void do_field(fieldDescriptor* fd) { 1842 if (fd->name() == _field_name) { 1843 assert(!_found, "fields can never be overloaded"); 1844 if (is_reference_type(fd->field_type())) { 1845 _found = true; 1846 _offset = fd->offset(); 1847 } 1848 } 1849 } 1850 bool found() { return _found; } 1851 int offset() { return _offset; } 1852 }; 1853 1854 void HeapShared::init_subgraph_entry_fields(ArchivableStaticFieldInfo fields[], 1855 TRAPS) { 1856 for (int i = 0; fields[i].valid(); i++) { 1857 ArchivableStaticFieldInfo* info = &fields[i]; 1858 TempNewSymbol klass_name = SymbolTable::new_symbol(info->klass_name); 1859 TempNewSymbol field_name = SymbolTable::new_symbol(info->field_name); 1860 ResourceMark rm; // for stringStream::as_string() etc. 1861 1862 #ifndef PRODUCT 1863 bool is_test_class = (ArchiveHeapTestClass != nullptr) && (strcmp(info->klass_name, ArchiveHeapTestClass) == 0); 1864 const char* test_class_name = ArchiveHeapTestClass; 1865 #else 1866 bool is_test_class = false; 1867 const char* test_class_name = ""; // avoid C++ printf checks warnings. 1868 #endif 1869 1870 if (is_test_class) { 1871 log_warning(aot)("Loading ArchiveHeapTestClass %s ...", test_class_name); 1872 } 1873 1874 Klass* k = SystemDictionary::resolve_or_fail(klass_name, true, THREAD); 1875 if (HAS_PENDING_EXCEPTION) { 1876 CLEAR_PENDING_EXCEPTION; 1877 stringStream st; 1878 st.print("Fail to initialize archive heap: %s cannot be loaded by the boot loader", info->klass_name); 1879 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1880 } 1881 1882 if (!k->is_instance_klass()) { 1883 stringStream st; 1884 st.print("Fail to initialize archive heap: %s is not an instance class", info->klass_name); 1885 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1886 } 1887 1888 InstanceKlass* ik = InstanceKlass::cast(k); 1889 assert(InstanceKlass::cast(ik)->defined_by_boot_loader(), 1890 "Only support boot classes"); 1891 1892 if (is_test_class) { 1893 if (ik->module()->is_named()) { 1894 // We don't want ArchiveHeapTestClass to be abused to easily load/initialize arbitrary 1895 // core-lib classes. You need to at least append to the bootclasspath. 1896 stringStream st; 1897 st.print("ArchiveHeapTestClass %s is not in unnamed module", test_class_name); 1898 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1899 } 1900 1901 if (ik->package() != nullptr) { 1902 // This restriction makes HeapShared::is_a_test_class_in_unnamed_module() easy. 1903 stringStream st; 1904 st.print("ArchiveHeapTestClass %s is not in unnamed package", test_class_name); 1905 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1906 } 1907 } else { 1908 if (ik->module()->name() != vmSymbols::java_base()) { 1909 // We don't want to deal with cases when a module is unavailable at runtime. 1910 // FUTURE -- load from archived heap only when module graph has not changed 1911 // between dump and runtime. 1912 stringStream st; 1913 st.print("%s is not in java.base module", info->klass_name); 1914 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1915 } 1916 } 1917 1918 if (is_test_class) { 1919 log_warning(aot)("Initializing ArchiveHeapTestClass %s ...", test_class_name); 1920 } 1921 ik->initialize(CHECK); 1922 1923 ArchivableStaticFieldFinder finder(ik, field_name); 1924 ik->do_local_static_fields(&finder); 1925 if (!finder.found()) { 1926 stringStream st; 1927 st.print("Unable to find the static T_OBJECT field %s::%s", info->klass_name, info->field_name); 1928 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1929 } 1930 1931 info->klass = ik; 1932 info->offset = finder.offset(); 1933 } 1934 } 1935 1936 void HeapShared::init_subgraph_entry_fields(TRAPS) { 1937 assert(CDSConfig::is_dumping_heap(), "must be"); 1938 _dump_time_subgraph_info_table = new (mtClass)DumpTimeKlassSubGraphInfoTable(); 1939 init_subgraph_entry_fields(archive_subgraph_entry_fields, CHECK); 1940 if (CDSConfig::is_dumping_full_module_graph()) { 1941 init_subgraph_entry_fields(fmg_archive_subgraph_entry_fields, CHECK); 1942 } 1943 } 1944 1945 #ifndef PRODUCT 1946 void HeapShared::setup_test_class(const char* test_class_name) { 1947 ArchivableStaticFieldInfo* p = archive_subgraph_entry_fields; 1948 int num_slots = sizeof(archive_subgraph_entry_fields) / sizeof(ArchivableStaticFieldInfo); 1949 assert(p[num_slots - 2].klass_name == nullptr, "must have empty slot that's patched below"); 1950 assert(p[num_slots - 1].klass_name == nullptr, "must have empty slot that marks the end of the list"); 1951 1952 if (test_class_name != nullptr) { 1953 p[num_slots - 2].klass_name = test_class_name; 1954 p[num_slots - 2].field_name = ARCHIVE_TEST_FIELD_NAME; 1955 } 1956 } 1957 1958 // See if ik is one of the test classes that are pulled in by -XX:ArchiveHeapTestClass 1959 // during runtime. This may be called before the module system is initialized so 1960 // we cannot rely on InstanceKlass::module(), etc. 1961 bool HeapShared::is_a_test_class_in_unnamed_module(Klass* ik) { 1962 if (_test_class != nullptr) { 1963 if (ik == _test_class) { 1964 return true; 1965 } 1966 Array<Klass*>* klasses = _test_class_record->subgraph_object_klasses(); 1967 if (klasses == nullptr) { 1968 return false; 1969 } 1970 1971 for (int i = 0; i < klasses->length(); i++) { 1972 Klass* k = klasses->at(i); 1973 if (k == ik) { 1974 Symbol* name; 1975 if (k->is_instance_klass()) { 1976 name = InstanceKlass::cast(k)->name(); 1977 } else if (k->is_objArray_klass()) { 1978 Klass* bk = ObjArrayKlass::cast(k)->bottom_klass(); 1979 if (!bk->is_instance_klass()) { 1980 return false; 1981 } 1982 name = bk->name(); 1983 } else { 1984 return false; 1985 } 1986 1987 // See KlassSubGraphInfo::check_allowed_klass() - we only allow test classes 1988 // to be: 1989 // (A) java.base classes (which must not be in the unnamed module) 1990 // (B) test classes which must be in the unnamed package of the unnamed module. 1991 // So if we see a '/' character in the class name, it must be in (A); 1992 // otherwise it must be in (B). 1993 if (name->index_of_at(0, "/", 1) >= 0) { 1994 return false; // (A) 1995 } 1996 1997 return true; // (B) 1998 } 1999 } 2000 } 2001 2002 return false; 2003 } 2004 2005 void HeapShared::initialize_test_class_from_archive(JavaThread* current) { 2006 Klass* k = _test_class; 2007 if (k != nullptr && ArchiveHeapLoader::is_in_use()) { 2008 JavaThread* THREAD = current; 2009 ExceptionMark em(THREAD); 2010 const ArchivedKlassSubGraphInfoRecord* record = 2011 resolve_or_init_classes_for_subgraph_of(k, /*do_init=*/false, THREAD); 2012 2013 // The _test_class is in the unnamed module, so it can't call CDS.initializeFromArchive() 2014 // from its <clinit> method. So we set up its "archivedObjects" field first, before 2015 // calling its <clinit>. This is not strictly clean, but it's a convenient way to write unit 2016 // test cases (see test/hotspot/jtreg/runtime/cds/appcds/cacheObject/ArchiveHeapTestClass.java). 2017 if (record != nullptr) { 2018 init_archived_fields_for(k, record); 2019 } 2020 resolve_or_init_classes_for_subgraph_of(k, /*do_init=*/true, THREAD); 2021 } 2022 } 2023 #endif 2024 2025 void HeapShared::init_for_dumping(TRAPS) { 2026 if (CDSConfig::is_dumping_heap()) { 2027 setup_test_class(ArchiveHeapTestClass); 2028 _dumped_interned_strings = new (mtClass)DumpedInternedStrings(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE); 2029 init_subgraph_entry_fields(CHECK); 2030 } 2031 } 2032 2033 void HeapShared::archive_object_subgraphs(ArchivableStaticFieldInfo fields[], 2034 bool is_full_module_graph) { 2035 _num_total_subgraph_recordings = 0; 2036 _num_total_walked_objs = 0; 2037 _num_total_archived_objs = 0; 2038 _num_total_recorded_klasses = 0; 2039 _num_total_verifications = 0; 2040 2041 // For each class X that has one or more archived fields: 2042 // [1] Dump the subgraph of each archived field 2043 // [2] Create a list of all the class of the objects that can be reached 2044 // by any of these static fields. 2045 // At runtime, these classes are initialized before X's archived fields 2046 // are restored by HeapShared::initialize_from_archived_subgraph(). 2047 for (int i = 0; fields[i].valid(); ) { 2048 ArchivableStaticFieldInfo* info = &fields[i]; 2049 const char* klass_name = info->klass_name; 2050 start_recording_subgraph(info->klass, klass_name, is_full_module_graph); 2051 2052 // If you have specified consecutive fields of the same klass in 2053 // fields[], these will be archived in the same 2054 // {start_recording_subgraph ... done_recording_subgraph} pass to 2055 // save time. 2056 for (; fields[i].valid(); i++) { 2057 ArchivableStaticFieldInfo* f = &fields[i]; 2058 if (f->klass_name != klass_name) { 2059 break; 2060 } 2061 2062 archive_reachable_objects_from_static_field(f->klass, f->klass_name, 2063 f->offset, f->field_name); 2064 } 2065 done_recording_subgraph(info->klass, klass_name); 2066 } 2067 2068 log_info(aot, heap)("Archived subgraph records = %d", 2069 _num_total_subgraph_recordings); 2070 log_info(aot, heap)(" Walked %d objects", _num_total_walked_objs); 2071 log_info(aot, heap)(" Archived %d objects", _num_total_archived_objs); 2072 log_info(aot, heap)(" Recorded %d klasses", _num_total_recorded_klasses); 2073 2074 #ifndef PRODUCT 2075 for (int i = 0; fields[i].valid(); i++) { 2076 ArchivableStaticFieldInfo* f = &fields[i]; 2077 verify_subgraph_from_static_field(f->klass, f->offset); 2078 } 2079 log_info(aot, heap)(" Verified %d references", _num_total_verifications); 2080 #endif 2081 } 2082 2083 // Keep track of the contents of the archived interned string table. This table 2084 // is used only by CDSHeapVerifier. 2085 void HeapShared::add_to_dumped_interned_strings(oop string) { 2086 assert_at_safepoint(); // DumpedInternedStrings uses raw oops 2087 assert(!ArchiveHeapWriter::is_string_too_large_to_archive(string), "must be"); 2088 bool created; 2089 _dumped_interned_strings->put_if_absent(string, true, &created); 2090 if (created) { 2091 // Prevent string deduplication from changing the value field to 2092 // something not in the archive. 2093 java_lang_String::set_deduplication_forbidden(string); 2094 _dumped_interned_strings->maybe_grow(); 2095 } 2096 } 2097 2098 bool HeapShared::is_dumped_interned_string(oop o) { 2099 return _dumped_interned_strings->get(o) != nullptr; 2100 } 2101 2102 void HeapShared::debug_trace() { 2103 ResourceMark rm; 2104 oop referrer = _object_being_archived.referrer(); 2105 if (referrer != nullptr) { 2106 LogStream ls(Log(aot, heap)::error()); 2107 ls.print_cr("Reference trace"); 2108 CDSHeapVerifier::trace_to_root(&ls, referrer); 2109 } 2110 } 2111 2112 #ifndef PRODUCT 2113 // At dump-time, find the location of all the non-null oop pointers in an archived heap 2114 // region. This way we can quickly relocate all the pointers without using 2115 // BasicOopIterateClosure at runtime. 2116 class FindEmbeddedNonNullPointers: public BasicOopIterateClosure { 2117 void* _start; 2118 BitMap *_oopmap; 2119 int _num_total_oops; 2120 int _num_null_oops; 2121 public: 2122 FindEmbeddedNonNullPointers(void* start, BitMap* oopmap) 2123 : _start(start), _oopmap(oopmap), _num_total_oops(0), _num_null_oops(0) {} 2124 2125 virtual void do_oop(narrowOop* p) { 2126 assert(UseCompressedOops, "sanity"); 2127 _num_total_oops ++; 2128 narrowOop v = *p; 2129 if (!CompressedOops::is_null(v)) { 2130 size_t idx = p - (narrowOop*)_start; 2131 _oopmap->set_bit(idx); 2132 } else { 2133 _num_null_oops ++; 2134 } 2135 } 2136 virtual void do_oop(oop* p) { 2137 assert(!UseCompressedOops, "sanity"); 2138 _num_total_oops ++; 2139 if ((*p) != nullptr) { 2140 size_t idx = p - (oop*)_start; 2141 _oopmap->set_bit(idx); 2142 } else { 2143 _num_null_oops ++; 2144 } 2145 } 2146 int num_total_oops() const { return _num_total_oops; } 2147 int num_null_oops() const { return _num_null_oops; } 2148 }; 2149 #endif 2150 2151 void HeapShared::count_allocation(size_t size) { 2152 _total_obj_count ++; 2153 _total_obj_size += size; 2154 for (int i = 0; i < ALLOC_STAT_SLOTS; i++) { 2155 if (size <= (size_t(1) << i)) { 2156 _alloc_count[i] ++; 2157 _alloc_size[i] += size; 2158 return; 2159 } 2160 } 2161 } 2162 2163 static double avg_size(size_t size, size_t count) { 2164 double avg = 0; 2165 if (count > 0) { 2166 avg = double(size * HeapWordSize) / double(count); 2167 } 2168 return avg; 2169 } 2170 2171 void HeapShared::print_stats() { 2172 size_t huge_count = _total_obj_count; 2173 size_t huge_size = _total_obj_size; 2174 2175 for (int i = 0; i < ALLOC_STAT_SLOTS; i++) { 2176 size_t byte_size_limit = (size_t(1) << i) * HeapWordSize; 2177 size_t count = _alloc_count[i]; 2178 size_t size = _alloc_size[i]; 2179 log_info(aot, heap)("%8zu objects are <= %-6zu" 2180 " bytes (total %8zu bytes, avg %8.1f bytes)", 2181 count, byte_size_limit, size * HeapWordSize, avg_size(size, count)); 2182 huge_count -= count; 2183 huge_size -= size; 2184 } 2185 2186 log_info(aot, heap)("%8zu huge objects (total %8zu bytes" 2187 ", avg %8.1f bytes)", 2188 huge_count, huge_size * HeapWordSize, 2189 avg_size(huge_size, huge_count)); 2190 log_info(aot, heap)("%8zu total objects (total %8zu bytes" 2191 ", avg %8.1f bytes)", 2192 _total_obj_count, _total_obj_size * HeapWordSize, 2193 avg_size(_total_obj_size, _total_obj_count)); 2194 } 2195 2196 bool HeapShared::is_archived_boot_layer_available(JavaThread* current) { 2197 TempNewSymbol klass_name = SymbolTable::new_symbol(ARCHIVED_BOOT_LAYER_CLASS); 2198 InstanceKlass* k = SystemDictionary::find_instance_klass(current, klass_name, Handle()); 2199 if (k == nullptr) { 2200 return false; 2201 } else { 2202 TempNewSymbol field_name = SymbolTable::new_symbol(ARCHIVED_BOOT_LAYER_FIELD); 2203 TempNewSymbol field_signature = SymbolTable::new_symbol("Ljdk/internal/module/ArchivedBootLayer;"); 2204 fieldDescriptor fd; 2205 if (k->find_field(field_name, field_signature, true, &fd) != nullptr) { 2206 oop m = k->java_mirror(); 2207 oop f = m->obj_field(fd.offset()); 2208 if (CompressedOops::is_null(f)) { 2209 return false; 2210 } 2211 } else { 2212 return false; 2213 } 2214 } 2215 return true; 2216 } 2217 2218 #endif // INCLUDE_CDS_JAVA_HEAP