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, true, 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 assert(!UseCompactObjectHeaders || scratch_m->mark().is_not_hashed_expanded(), "scratch mirror must have not-hashed-expanded state"); 595 if (!orig_mirror->fast_no_hash_check()) { 596 intptr_t orig_mark = orig_mirror->mark().value(); 597 intptr_t src_hash = orig_mirror->identity_hash(); 598 if (UseCompactObjectHeaders) { 599 // We leave the cases not_hashed/not_hashed_expanded as they are. 600 assert(orig_mirror->mark().is_hashed_not_expanded() || orig_mirror->mark().is_hashed_expanded(), "must be hashed"); 601 Klass* orig_klass = orig_mirror->klass(); 602 narrowKlass nk = CompressedKlassPointers::encode(orig_klass); 603 markWord mark = markWord::prototype().set_narrow_klass(nk); 604 mark = mark.copy_hashctrl_from(orig_mirror->mark()); 605 if (mark.is_hashed_not_expanded()) { 606 scratch_m->initialize_hash_if_necessary(orig_mirror, orig_klass, mark); 607 } else { 608 assert(mark.is_hashed_expanded(), "must be hashed & moved"); 609 int offset = orig_klass->hash_offset_in_bytes(orig_mirror, mark); 610 assert(offset >= 8, "hash offset must not be in header"); 611 scratch_m->int_field_put(offset, (jint) src_hash); 612 scratch_m->set_mark(mark); 613 } 614 assert(scratch_m->mark().is_hashed_expanded(), "must be hashed & moved"); 615 assert(scratch_m->mark().is_not_hashed_expanded() || scratch_m->mark().is_hashed_expanded(), "must be not hashed and expanded"); 616 } else { 617 scratch_m->set_mark(markWord::prototype().copy_set_hash(src_hash)); 618 DEBUG_ONLY(intptr_t archived_hash = scratch_m->identity_hash()); 619 assert(src_hash == archived_hash, "Different hash codes: original " INTPTR_FORMAT ", archived " INTPTR_FORMAT, src_hash, archived_hash); 620 } 621 assert(scratch_m->mark().is_unlocked(), "sanity"); 622 } 623 } 624 625 static objArrayOop get_archived_resolved_references(InstanceKlass* src_ik) { 626 if (SystemDictionaryShared::is_builtin_loader(src_ik->class_loader_data())) { 627 objArrayOop rr = src_ik->constants()->resolved_references_or_null(); 628 if (rr != nullptr && !ArchiveHeapWriter::is_too_large_to_archive(rr)) { 629 return HeapShared::scratch_resolved_references(src_ik->constants()); 630 } 631 } 632 return nullptr; 633 } 634 635 void HeapShared::archive_strings() { 636 oop shared_strings_array = StringTable::init_shared_strings_array(); 637 bool success = archive_reachable_objects_from(1, _dump_time_special_subgraph, shared_strings_array); 638 assert(success, "shared strings array must not point to arrays or strings that are too large to archive"); 639 StringTable::set_shared_strings_array_index(append_root(shared_strings_array)); 640 } 641 642 int HeapShared::archive_exception_instance(oop exception) { 643 bool success = archive_reachable_objects_from(1, _dump_time_special_subgraph, exception); 644 assert(success, "sanity"); 645 return append_root(exception); 646 } 647 648 void HeapShared::mark_native_pointers(oop orig_obj) { 649 if (java_lang_Class::is_instance(orig_obj)) { 650 ArchiveHeapWriter::mark_native_pointer(orig_obj, java_lang_Class::klass_offset()); 651 ArchiveHeapWriter::mark_native_pointer(orig_obj, java_lang_Class::array_klass_offset()); 652 } else if (java_lang_invoke_ResolvedMethodName::is_instance(orig_obj)) { 653 ArchiveHeapWriter::mark_native_pointer(orig_obj, java_lang_invoke_ResolvedMethodName::vmtarget_offset()); 654 } 655 } 656 657 void HeapShared::get_pointer_info(oop src_obj, bool& has_oop_pointers, bool& has_native_pointers) { 658 CachedOopInfo* info = archived_object_cache()->get(src_obj); 659 assert(info != nullptr, "must be"); 660 has_oop_pointers = info->has_oop_pointers(); 661 has_native_pointers = info->has_native_pointers(); 662 } 663 664 void HeapShared::set_has_native_pointers(oop src_obj) { 665 CachedOopInfo* info = archived_object_cache()->get(src_obj); 666 assert(info != nullptr, "must be"); 667 info->set_has_native_pointers(); 668 } 669 670 // Between start_scanning_for_oops() and end_scanning_for_oops(), we discover all Java heap objects that 671 // should be stored in the AOT cache. The scanning is coordinated by AOTArtifactFinder. 672 void HeapShared::start_scanning_for_oops() { 673 { 674 NoSafepointVerifier nsv; 675 676 // The special subgraph doesn't belong to any class. We use Object_klass() here just 677 // for convenience. 678 _dump_time_special_subgraph = init_subgraph_info(vmClasses::Object_klass(), false); 679 680 // Cache for recording where the archived objects are copied to 681 create_archived_object_cache(); 682 683 if (UseCompressedOops || UseG1GC) { 684 aot_log_info(aot)("Heap range = [" PTR_FORMAT " - " PTR_FORMAT "]", 685 UseCompressedOops ? p2i(CompressedOops::begin()) : 686 p2i((address)G1CollectedHeap::heap()->reserved().start()), 687 UseCompressedOops ? p2i(CompressedOops::end()) : 688 p2i((address)G1CollectedHeap::heap()->reserved().end())); 689 } 690 691 archive_subgraphs(); 692 } 693 694 init_seen_objects_table(); 695 Universe::archive_exception_instances(); 696 } 697 698 void HeapShared::end_scanning_for_oops() { 699 archive_strings(); 700 delete_seen_objects_table(); 701 } 702 703 void HeapShared::write_heap(ArchiveHeapInfo *heap_info) { 704 { 705 NoSafepointVerifier nsv; 706 CDSHeapVerifier::verify(); 707 check_special_subgraph_classes(); 708 } 709 710 StringTable::write_shared_table(); 711 ArchiveHeapWriter::write(_pending_roots, heap_info); 712 713 ArchiveBuilder::OtherROAllocMark mark; 714 write_subgraph_info_table(); 715 } 716 717 void HeapShared::scan_java_mirror(oop orig_mirror) { 718 oop m = scratch_java_mirror(orig_mirror); 719 if (m != nullptr) { // nullptr if for custom class loader 720 copy_java_mirror_hashcode(orig_mirror, m); 721 bool success = archive_reachable_objects_from(1, _dump_time_special_subgraph, m); 722 assert(success, "sanity"); 723 } 724 } 725 726 void HeapShared::scan_java_class(Klass* orig_k) { 727 scan_java_mirror(orig_k->java_mirror()); 728 729 if (orig_k->is_instance_klass()) { 730 InstanceKlass* orig_ik = InstanceKlass::cast(orig_k); 731 orig_ik->constants()->prepare_resolved_references_for_archiving(); 732 objArrayOop rr = get_archived_resolved_references(orig_ik); 733 if (rr != nullptr) { 734 bool success = HeapShared::archive_reachable_objects_from(1, _dump_time_special_subgraph, rr); 735 assert(success, "must be"); 736 } 737 } 738 } 739 740 void HeapShared::archive_subgraphs() { 741 assert(CDSConfig::is_dumping_heap(), "must be"); 742 743 archive_object_subgraphs(archive_subgraph_entry_fields, 744 false /* is_full_module_graph */); 745 746 if (CDSConfig::is_dumping_full_module_graph()) { 747 archive_object_subgraphs(fmg_archive_subgraph_entry_fields, 748 true /* is_full_module_graph */); 749 Modules::verify_archived_modules(); 750 } 751 } 752 753 // 754 // Subgraph archiving support 755 // 756 HeapShared::DumpTimeKlassSubGraphInfoTable* HeapShared::_dump_time_subgraph_info_table = nullptr; 757 HeapShared::RunTimeKlassSubGraphInfoTable HeapShared::_run_time_subgraph_info_table; 758 759 // Get the subgraph_info for Klass k. A new subgraph_info is created if 760 // there is no existing one for k. The subgraph_info records the "buffered" 761 // address of the class. 762 KlassSubGraphInfo* HeapShared::init_subgraph_info(Klass* k, bool is_full_module_graph) { 763 assert(CDSConfig::is_dumping_heap(), "dump time only"); 764 bool created; 765 KlassSubGraphInfo* info = 766 _dump_time_subgraph_info_table->put_if_absent(k, KlassSubGraphInfo(k, is_full_module_graph), 767 &created); 768 assert(created, "must not initialize twice"); 769 return info; 770 } 771 772 KlassSubGraphInfo* HeapShared::get_subgraph_info(Klass* k) { 773 assert(CDSConfig::is_dumping_heap(), "dump time only"); 774 KlassSubGraphInfo* info = _dump_time_subgraph_info_table->get(k); 775 assert(info != nullptr, "must have been initialized"); 776 return info; 777 } 778 779 // Add an entry field to the current KlassSubGraphInfo. 780 void KlassSubGraphInfo::add_subgraph_entry_field(int static_field_offset, oop v) { 781 assert(CDSConfig::is_dumping_heap(), "dump time only"); 782 if (_subgraph_entry_fields == nullptr) { 783 _subgraph_entry_fields = 784 new (mtClass) GrowableArray<int>(10, mtClass); 785 } 786 _subgraph_entry_fields->append(static_field_offset); 787 _subgraph_entry_fields->append(HeapShared::append_root(v)); 788 } 789 790 // Add the Klass* for an object in the current KlassSubGraphInfo's subgraphs. 791 // Only objects of boot classes can be included in sub-graph. 792 void KlassSubGraphInfo::add_subgraph_object_klass(Klass* orig_k) { 793 assert(CDSConfig::is_dumping_heap(), "dump time only"); 794 795 if (_subgraph_object_klasses == nullptr) { 796 _subgraph_object_klasses = 797 new (mtClass) GrowableArray<Klass*>(50, mtClass); 798 } 799 800 if (_k == orig_k) { 801 // Don't add the Klass containing the sub-graph to it's own klass 802 // initialization list. 803 return; 804 } 805 806 if (orig_k->is_instance_klass()) { 807 #ifdef ASSERT 808 InstanceKlass* ik = InstanceKlass::cast(orig_k); 809 if (CDSConfig::is_dumping_method_handles()) { 810 // -XX:AOTInitTestClass must be used carefully in regression tests to 811 // include only classes that are safe to aot-initialize. 812 assert(ik->class_loader() == nullptr || 813 HeapShared::is_lambda_proxy_klass(ik) || 814 AOTClassInitializer::has_test_class(), 815 "we can archive only instances of boot classes or lambda proxy classes"); 816 } else { 817 assert(ik->class_loader() == nullptr, "must be boot class"); 818 } 819 #endif 820 // vmClasses::xxx_klass() are not updated, need to check 821 // the original Klass* 822 if (orig_k == vmClasses::String_klass() || 823 orig_k == vmClasses::Object_klass()) { 824 // Initialized early during VM initialization. No need to be added 825 // to the sub-graph object class list. 826 return; 827 } 828 check_allowed_klass(InstanceKlass::cast(orig_k)); 829 } else if (orig_k->is_objArray_klass()) { 830 Klass* abk = ObjArrayKlass::cast(orig_k)->bottom_klass(); 831 if (abk->is_instance_klass()) { 832 assert(InstanceKlass::cast(abk)->defined_by_boot_loader(), 833 "must be boot class"); 834 check_allowed_klass(InstanceKlass::cast(ObjArrayKlass::cast(orig_k)->bottom_klass())); 835 } 836 if (orig_k == Universe::objectArrayKlass()) { 837 // Initialized early during Universe::genesis. No need to be added 838 // to the list. 839 return; 840 } 841 } else { 842 assert(orig_k->is_typeArray_klass(), "must be"); 843 // Primitive type arrays are created early during Universe::genesis. 844 return; 845 } 846 847 if (log_is_enabled(Debug, aot, heap)) { 848 if (!_subgraph_object_klasses->contains(orig_k)) { 849 ResourceMark rm; 850 log_debug(aot, heap)("Adding klass %s", orig_k->external_name()); 851 } 852 } 853 854 _subgraph_object_klasses->append_if_missing(orig_k); 855 _has_non_early_klasses |= is_non_early_klass(orig_k); 856 } 857 858 void KlassSubGraphInfo::check_allowed_klass(InstanceKlass* ik) { 859 #ifndef PRODUCT 860 if (AOTClassInitializer::has_test_class()) { 861 // The tests can cache arbitrary types of objects. 862 return; 863 } 864 #endif 865 866 if (ik->module()->name() == vmSymbols::java_base()) { 867 assert(ik->package() != nullptr, "classes in java.base cannot be in unnamed package"); 868 return; 869 } 870 871 const char* lambda_msg = ""; 872 if (CDSConfig::is_dumping_method_handles()) { 873 lambda_msg = ", or a lambda proxy class"; 874 if (HeapShared::is_lambda_proxy_klass(ik) && 875 (ik->class_loader() == nullptr || 876 ik->class_loader() == SystemDictionary::java_platform_loader() || 877 ik->class_loader() == SystemDictionary::java_system_loader())) { 878 return; 879 } 880 } 881 882 #ifndef PRODUCT 883 if (!ik->module()->is_named() && ik->package() == nullptr && ArchiveHeapTestClass != nullptr) { 884 // This class is loaded by ArchiveHeapTestClass 885 return; 886 } 887 const char* testcls_msg = ", or a test class in an unnamed package of an unnamed module"; 888 #else 889 const char* testcls_msg = ""; 890 #endif 891 892 ResourceMark rm; 893 log_error(aot, heap)("Class %s not allowed in archive heap. Must be in java.base%s%s", 894 ik->external_name(), lambda_msg, testcls_msg); 895 MetaspaceShared::unrecoverable_writing_error(); 896 } 897 898 bool KlassSubGraphInfo::is_non_early_klass(Klass* k) { 899 if (k->is_objArray_klass()) { 900 k = ObjArrayKlass::cast(k)->bottom_klass(); 901 } 902 if (k->is_instance_klass()) { 903 if (!SystemDictionaryShared::is_early_klass(InstanceKlass::cast(k))) { 904 ResourceMark rm; 905 log_info(aot, heap)("non-early: %s", k->external_name()); 906 return true; 907 } else { 908 return false; 909 } 910 } else { 911 return false; 912 } 913 } 914 915 // Initialize an archived subgraph_info_record from the given KlassSubGraphInfo. 916 void ArchivedKlassSubGraphInfoRecord::init(KlassSubGraphInfo* info) { 917 _k = ArchiveBuilder::get_buffered_klass(info->klass()); 918 _entry_field_records = nullptr; 919 _subgraph_object_klasses = nullptr; 920 _is_full_module_graph = info->is_full_module_graph(); 921 922 if (_is_full_module_graph) { 923 // Consider all classes referenced by the full module graph as early -- we will be 924 // allocating objects of these classes during JVMTI early phase, so they cannot 925 // be processed by (non-early) JVMTI ClassFileLoadHook 926 _has_non_early_klasses = false; 927 } else { 928 _has_non_early_klasses = info->has_non_early_klasses(); 929 } 930 931 if (_has_non_early_klasses) { 932 ResourceMark rm; 933 log_info(aot, heap)( 934 "Subgraph of klass %s has non-early klasses and cannot be used when JVMTI ClassFileLoadHook is enabled", 935 _k->external_name()); 936 } 937 938 // populate the entry fields 939 GrowableArray<int>* entry_fields = info->subgraph_entry_fields(); 940 if (entry_fields != nullptr) { 941 int num_entry_fields = entry_fields->length(); 942 assert(num_entry_fields % 2 == 0, "sanity"); 943 _entry_field_records = 944 ArchiveBuilder::new_ro_array<int>(num_entry_fields); 945 for (int i = 0 ; i < num_entry_fields; i++) { 946 _entry_field_records->at_put(i, entry_fields->at(i)); 947 } 948 } 949 950 // <recorded_klasses> has the Klasses of all the objects that are referenced by this subgraph. 951 // Copy those that need to be explicitly initialized into <_subgraph_object_klasses>. 952 GrowableArray<Klass*>* recorded_klasses = info->subgraph_object_klasses(); 953 if (recorded_klasses != nullptr) { 954 // AOT-inited classes are automatically marked as "initialized" during bootstrap. When 955 // programmatically loading a subgraph, we only need to explicitly initialize the classes 956 // that are not aot-inited. 957 int num_to_copy = 0; 958 for (int i = 0; i < recorded_klasses->length(); i++) { 959 Klass* subgraph_k = ArchiveBuilder::get_buffered_klass(recorded_klasses->at(i)); 960 if (!subgraph_k->has_aot_initialized_mirror()) { 961 num_to_copy ++; 962 } 963 } 964 965 _subgraph_object_klasses = ArchiveBuilder::new_ro_array<Klass*>(num_to_copy); 966 bool is_special = (_k == ArchiveBuilder::get_buffered_klass(vmClasses::Object_klass())); 967 for (int i = 0, n = 0; i < recorded_klasses->length(); i++) { 968 Klass* subgraph_k = ArchiveBuilder::get_buffered_klass(recorded_klasses->at(i)); 969 if (subgraph_k->has_aot_initialized_mirror()) { 970 continue; 971 } 972 if (log_is_enabled(Info, aot, heap)) { 973 ResourceMark rm; 974 const char* owner_name = is_special ? "<special>" : _k->external_name(); 975 if (subgraph_k->is_instance_klass()) { 976 InstanceKlass* src_ik = InstanceKlass::cast(ArchiveBuilder::current()->get_source_addr(subgraph_k)); 977 } 978 log_info(aot, heap)( 979 "Archived object klass %s (%2d) => %s", 980 owner_name, n, subgraph_k->external_name()); 981 } 982 _subgraph_object_klasses->at_put(n, subgraph_k); 983 ArchivePtrMarker::mark_pointer(_subgraph_object_klasses->adr_at(n)); 984 n++; 985 } 986 } 987 988 ArchivePtrMarker::mark_pointer(&_k); 989 ArchivePtrMarker::mark_pointer(&_entry_field_records); 990 ArchivePtrMarker::mark_pointer(&_subgraph_object_klasses); 991 } 992 993 class HeapShared::CopyKlassSubGraphInfoToArchive : StackObj { 994 CompactHashtableWriter* _writer; 995 public: 996 CopyKlassSubGraphInfoToArchive(CompactHashtableWriter* writer) : _writer(writer) {} 997 998 bool do_entry(Klass* klass, KlassSubGraphInfo& info) { 999 if (info.subgraph_object_klasses() != nullptr || info.subgraph_entry_fields() != nullptr) { 1000 ArchivedKlassSubGraphInfoRecord* record = HeapShared::archive_subgraph_info(&info); 1001 Klass* buffered_k = ArchiveBuilder::get_buffered_klass(klass); 1002 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary((address)buffered_k); 1003 u4 delta = ArchiveBuilder::current()->any_to_offset_u4(record); 1004 _writer->add(hash, delta); 1005 } 1006 return true; // keep on iterating 1007 } 1008 }; 1009 1010 ArchivedKlassSubGraphInfoRecord* HeapShared::archive_subgraph_info(KlassSubGraphInfo* info) { 1011 ArchivedKlassSubGraphInfoRecord* record = 1012 (ArchivedKlassSubGraphInfoRecord*)ArchiveBuilder::ro_region_alloc(sizeof(ArchivedKlassSubGraphInfoRecord)); 1013 record->init(info); 1014 if (info == _dump_time_special_subgraph) { 1015 _run_time_special_subgraph = record; 1016 } 1017 return record; 1018 } 1019 1020 // Build the records of archived subgraph infos, which include: 1021 // - Entry points to all subgraphs from the containing class mirror. The entry 1022 // points are static fields in the mirror. For each entry point, the field 1023 // offset, and value are recorded in the sub-graph 1024 // info. The value is stored back to the corresponding field at runtime. 1025 // - A list of klasses that need to be loaded/initialized before archived 1026 // java object sub-graph can be accessed at runtime. 1027 void HeapShared::write_subgraph_info_table() { 1028 // Allocate the contents of the hashtable(s) inside the RO region of the CDS archive. 1029 DumpTimeKlassSubGraphInfoTable* d_table = _dump_time_subgraph_info_table; 1030 CompactHashtableStats stats; 1031 1032 _run_time_subgraph_info_table.reset(); 1033 1034 CompactHashtableWriter writer(d_table->_count, &stats); 1035 CopyKlassSubGraphInfoToArchive copy(&writer); 1036 d_table->iterate(©); 1037 writer.dump(&_run_time_subgraph_info_table, "subgraphs"); 1038 1039 #ifndef PRODUCT 1040 if (ArchiveHeapTestClass != nullptr) { 1041 size_t len = strlen(ArchiveHeapTestClass) + 1; 1042 Array<char>* array = ArchiveBuilder::new_ro_array<char>((int)len); 1043 strncpy(array->adr_at(0), ArchiveHeapTestClass, len); 1044 _archived_ArchiveHeapTestClass = array; 1045 } 1046 #endif 1047 if (log_is_enabled(Info, aot, heap)) { 1048 print_stats(); 1049 } 1050 } 1051 1052 void HeapShared::add_root_segment(objArrayOop segment_oop) { 1053 assert(segment_oop != nullptr, "must be"); 1054 assert(ArchiveHeapLoader::is_in_use(), "must be"); 1055 if (_root_segments == nullptr) { 1056 _root_segments = new GrowableArrayCHeap<OopHandle, mtClassShared>(10); 1057 } 1058 _root_segments->push(OopHandle(Universe::vm_global(), segment_oop)); 1059 } 1060 1061 void HeapShared::init_root_segment_sizes(int max_size_elems) { 1062 _root_segment_max_size_elems = max_size_elems; 1063 } 1064 1065 void HeapShared::serialize_tables(SerializeClosure* soc) { 1066 1067 #ifndef PRODUCT 1068 soc->do_ptr(&_archived_ArchiveHeapTestClass); 1069 if (soc->reading() && _archived_ArchiveHeapTestClass != nullptr) { 1070 _test_class_name = _archived_ArchiveHeapTestClass->adr_at(0); 1071 setup_test_class(_test_class_name); 1072 } 1073 #endif 1074 1075 _run_time_subgraph_info_table.serialize_header(soc); 1076 soc->do_ptr(&_run_time_special_subgraph); 1077 } 1078 1079 static void verify_the_heap(Klass* k, const char* which) { 1080 if (VerifyArchivedFields > 0) { 1081 ResourceMark rm; 1082 log_info(aot, heap)("Verify heap %s initializing static field(s) in %s", 1083 which, k->external_name()); 1084 1085 VM_Verify verify_op; 1086 VMThread::execute(&verify_op); 1087 1088 if (VerifyArchivedFields > 1 && is_init_completed()) { 1089 // At this time, the oop->klass() of some archived objects in the heap may not 1090 // have been loaded into the system dictionary yet. Nevertheless, oop->klass() should 1091 // have enough information (object size, oop maps, etc) so that a GC can be safely 1092 // performed. 1093 // 1094 // -XX:VerifyArchivedFields=2 force a GC to happen in such an early stage 1095 // to check for GC safety. 1096 log_info(aot, heap)("Trigger GC %s initializing static field(s) in %s", 1097 which, k->external_name()); 1098 FlagSetting fs1(VerifyBeforeGC, true); 1099 FlagSetting fs2(VerifyDuringGC, true); 1100 FlagSetting fs3(VerifyAfterGC, true); 1101 Universe::heap()->collect(GCCause::_java_lang_system_gc); 1102 } 1103 } 1104 } 1105 1106 // Before GC can execute, we must ensure that all oops reachable from HeapShared::roots() 1107 // have a valid klass. I.e., oopDesc::klass() must have already been resolved. 1108 // 1109 // Note: if a ArchivedKlassSubGraphInfoRecord contains non-early classes, and JVMTI 1110 // ClassFileLoadHook is enabled, it's possible for this class to be dynamically replaced. In 1111 // this case, we will not load the ArchivedKlassSubGraphInfoRecord and will clear its roots. 1112 void HeapShared::resolve_classes(JavaThread* current) { 1113 assert(CDSConfig::is_using_archive(), "runtime only!"); 1114 if (!ArchiveHeapLoader::is_in_use()) { 1115 return; // nothing to do 1116 } 1117 resolve_classes_for_subgraphs(current, archive_subgraph_entry_fields); 1118 resolve_classes_for_subgraphs(current, fmg_archive_subgraph_entry_fields); 1119 } 1120 1121 void HeapShared::resolve_classes_for_subgraphs(JavaThread* current, ArchivableStaticFieldInfo fields[]) { 1122 for (int i = 0; fields[i].valid(); i++) { 1123 ArchivableStaticFieldInfo* info = &fields[i]; 1124 TempNewSymbol klass_name = SymbolTable::new_symbol(info->klass_name); 1125 InstanceKlass* k = SystemDictionaryShared::find_builtin_class(klass_name); 1126 assert(k != nullptr && k->defined_by_boot_loader(), "sanity"); 1127 resolve_classes_for_subgraph_of(current, k); 1128 } 1129 } 1130 1131 void HeapShared::resolve_classes_for_subgraph_of(JavaThread* current, Klass* k) { 1132 JavaThread* THREAD = current; 1133 ExceptionMark em(THREAD); 1134 const ArchivedKlassSubGraphInfoRecord* record = 1135 resolve_or_init_classes_for_subgraph_of(k, /*do_init=*/false, THREAD); 1136 if (HAS_PENDING_EXCEPTION) { 1137 CLEAR_PENDING_EXCEPTION; 1138 } 1139 if (record == nullptr) { 1140 clear_archived_roots_of(k); 1141 } 1142 } 1143 1144 void HeapShared::initialize_java_lang_invoke(TRAPS) { 1145 if (CDSConfig::is_using_aot_linked_classes() || CDSConfig::is_dumping_method_handles()) { 1146 resolve_or_init("java/lang/invoke/Invokers$Holder", true, CHECK); 1147 resolve_or_init("java/lang/invoke/MethodHandle", true, CHECK); 1148 resolve_or_init("java/lang/invoke/MethodHandleNatives", true, CHECK); 1149 resolve_or_init("java/lang/invoke/DirectMethodHandle$Holder", true, CHECK); 1150 resolve_or_init("java/lang/invoke/DelegatingMethodHandle$Holder", true, CHECK); 1151 resolve_or_init("java/lang/invoke/LambdaForm$Holder", true, CHECK); 1152 resolve_or_init("java/lang/invoke/BoundMethodHandle$Species_L", true, CHECK); 1153 } 1154 } 1155 1156 // Initialize the InstanceKlasses of objects that are reachable from the following roots: 1157 // - interned strings 1158 // - Klass::java_mirror() -- including aot-initialized mirrors such as those of Enum klasses. 1159 // - ConstantPool::resolved_references() 1160 // - Universe::<xxx>_exception_instance() 1161 // 1162 // For example, if this enum class is initialized at AOT cache assembly time: 1163 // 1164 // enum Fruit { 1165 // APPLE, ORANGE, BANANA; 1166 // static final Set<Fruit> HAVE_SEEDS = new HashSet<>(Arrays.asList(APPLE, ORANGE)); 1167 // } 1168 // 1169 // the aot-initialized mirror of Fruit has a static field that references HashSet, which 1170 // should be initialized before any Java code can access the Fruit class. Note that 1171 // HashSet itself doesn't necessary need to be an aot-initialized class. 1172 void HeapShared::init_classes_for_special_subgraph(Handle class_loader, TRAPS) { 1173 if (!ArchiveHeapLoader::is_in_use()) { 1174 return; 1175 } 1176 1177 assert( _run_time_special_subgraph != nullptr, "must be"); 1178 Array<Klass*>* klasses = _run_time_special_subgraph->subgraph_object_klasses(); 1179 if (klasses != nullptr) { 1180 for (int pass = 0; pass < 2; pass ++) { 1181 for (int i = 0; i < klasses->length(); i++) { 1182 Klass* k = klasses->at(i); 1183 if (k->class_loader_data() == nullptr) { 1184 // This class is not yet loaded. We will initialize it in a later phase. 1185 // For example, we have loaded only AOTLinkedClassCategory::BOOT1 classes 1186 // but k is part of AOTLinkedClassCategory::BOOT2. 1187 continue; 1188 } 1189 if (k->class_loader() == class_loader()) { 1190 if (pass == 0) { 1191 if (k->is_instance_klass()) { 1192 InstanceKlass::cast(k)->link_class(CHECK); 1193 } 1194 } else { 1195 resolve_or_init(k, /*do_init*/true, CHECK); 1196 } 1197 } 1198 } 1199 } 1200 } 1201 } 1202 1203 void HeapShared::initialize_from_archived_subgraph(JavaThread* current, Klass* k) { 1204 JavaThread* THREAD = current; 1205 if (!ArchiveHeapLoader::is_in_use()) { 1206 return; // nothing to do 1207 } 1208 1209 if (k->name()->equals("jdk/internal/module/ArchivedModuleGraph") && 1210 !CDSConfig::is_using_optimized_module_handling() && 1211 // archive was created with --module-path 1212 AOTClassLocationConfig::runtime()->num_module_paths() > 0) { 1213 // ArchivedModuleGraph was created with a --module-path that's different than the runtime --module-path. 1214 // Thus, it might contain references to modules that do not exist at runtime. We cannot use it. 1215 log_info(aot, heap)("Skip initializing ArchivedModuleGraph subgraph: is_using_optimized_module_handling=%s num_module_paths=%d", 1216 BOOL_TO_STR(CDSConfig::is_using_optimized_module_handling()), 1217 AOTClassLocationConfig::runtime()->num_module_paths()); 1218 return; 1219 } 1220 1221 ExceptionMark em(THREAD); 1222 const ArchivedKlassSubGraphInfoRecord* record = 1223 resolve_or_init_classes_for_subgraph_of(k, /*do_init=*/true, THREAD); 1224 1225 if (HAS_PENDING_EXCEPTION) { 1226 CLEAR_PENDING_EXCEPTION; 1227 // None of the field value will be set if there was an exception when initializing the classes. 1228 // The java code will not see any of the archived objects in the 1229 // subgraphs referenced from k in this case. 1230 return; 1231 } 1232 1233 if (record != nullptr) { 1234 init_archived_fields_for(k, record); 1235 } 1236 } 1237 1238 const ArchivedKlassSubGraphInfoRecord* 1239 HeapShared::resolve_or_init_classes_for_subgraph_of(Klass* k, bool do_init, TRAPS) { 1240 assert(!CDSConfig::is_dumping_heap(), "Should not be called when dumping heap"); 1241 1242 if (!k->is_shared()) { 1243 return nullptr; 1244 } 1245 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(k); 1246 const ArchivedKlassSubGraphInfoRecord* record = _run_time_subgraph_info_table.lookup(k, hash, 0); 1247 1248 #ifndef PRODUCT 1249 if (_test_class_name != nullptr && k->name()->equals(_test_class_name) && record != nullptr) { 1250 _test_class = k; 1251 _test_class_record = record; 1252 } 1253 #endif 1254 1255 // Initialize from archived data. Currently this is done only 1256 // during VM initialization time. No lock is needed. 1257 if (record == nullptr) { 1258 if (log_is_enabled(Info, aot, heap)) { 1259 ResourceMark rm(THREAD); 1260 log_info(aot, heap)("subgraph %s is not recorded", 1261 k->external_name()); 1262 } 1263 return nullptr; 1264 } else { 1265 if (record->is_full_module_graph() && !CDSConfig::is_using_full_module_graph()) { 1266 if (log_is_enabled(Info, aot, heap)) { 1267 ResourceMark rm(THREAD); 1268 log_info(aot, heap)("subgraph %s cannot be used because full module graph is disabled", 1269 k->external_name()); 1270 } 1271 return nullptr; 1272 } 1273 1274 if (record->has_non_early_klasses() && JvmtiExport::should_post_class_file_load_hook()) { 1275 if (log_is_enabled(Info, aot, heap)) { 1276 ResourceMark rm(THREAD); 1277 log_info(aot, heap)("subgraph %s cannot be used because JVMTI ClassFileLoadHook is enabled", 1278 k->external_name()); 1279 } 1280 return nullptr; 1281 } 1282 1283 if (log_is_enabled(Info, aot, heap)) { 1284 ResourceMark rm; 1285 log_info(aot, heap)("%s subgraph %s ", do_init ? "init" : "resolve", k->external_name()); 1286 } 1287 1288 resolve_or_init(k, do_init, CHECK_NULL); 1289 1290 // Load/link/initialize the klasses of the objects in the subgraph. 1291 // nullptr class loader is used. 1292 Array<Klass*>* klasses = record->subgraph_object_klasses(); 1293 if (klasses != nullptr) { 1294 for (int i = 0; i < klasses->length(); i++) { 1295 Klass* klass = klasses->at(i); 1296 if (!klass->is_shared()) { 1297 return nullptr; 1298 } 1299 resolve_or_init(klass, do_init, CHECK_NULL); 1300 } 1301 } 1302 } 1303 1304 return record; 1305 } 1306 1307 void HeapShared::resolve_or_init(const char* klass_name, bool do_init, TRAPS) { 1308 TempNewSymbol klass_name_sym = SymbolTable::new_symbol(klass_name); 1309 InstanceKlass* k = SystemDictionaryShared::find_builtin_class(klass_name_sym); 1310 if (k == nullptr) { 1311 return; 1312 } 1313 assert(k->defined_by_boot_loader(), "sanity"); 1314 resolve_or_init(k, false, CHECK); 1315 if (do_init) { 1316 resolve_or_init(k, true, CHECK); 1317 } 1318 } 1319 1320 void HeapShared::resolve_or_init(Klass* k, bool do_init, TRAPS) { 1321 if (!do_init) { 1322 if (k->class_loader_data() == nullptr) { 1323 Klass* resolved_k = SystemDictionary::resolve_or_null(k->name(), CHECK); 1324 assert(resolved_k == k, "classes used by archived heap must not be replaced by JVMTI ClassFileLoadHook"); 1325 } 1326 } else { 1327 assert(k->class_loader_data() != nullptr, "must have been resolved by HeapShared::resolve_classes"); 1328 if (k->is_instance_klass()) { 1329 InstanceKlass* ik = InstanceKlass::cast(k); 1330 ik->initialize(CHECK); 1331 } else if (k->is_objArray_klass()) { 1332 ObjArrayKlass* oak = ObjArrayKlass::cast(k); 1333 oak->initialize(CHECK); 1334 } 1335 } 1336 } 1337 1338 void HeapShared::init_archived_fields_for(Klass* k, const ArchivedKlassSubGraphInfoRecord* record) { 1339 verify_the_heap(k, "before"); 1340 1341 // Load the subgraph entry fields from the record and store them back to 1342 // the corresponding fields within the mirror. 1343 oop m = k->java_mirror(); 1344 Array<int>* entry_field_records = record->entry_field_records(); 1345 if (entry_field_records != nullptr) { 1346 int efr_len = entry_field_records->length(); 1347 assert(efr_len % 2 == 0, "sanity"); 1348 for (int i = 0; i < efr_len; i += 2) { 1349 int field_offset = entry_field_records->at(i); 1350 int root_index = entry_field_records->at(i+1); 1351 oop v = get_root(root_index, /*clear=*/true); 1352 if (k->has_aot_initialized_mirror()) { 1353 assert(v == m->obj_field(field_offset), "must be aot-initialized"); 1354 } else { 1355 m->obj_field_put(field_offset, v); 1356 } 1357 log_debug(aot, heap)(" " PTR_FORMAT " init field @ %2d = " PTR_FORMAT, p2i(k), field_offset, p2i(v)); 1358 } 1359 1360 // Done. Java code can see the archived sub-graphs referenced from k's 1361 // mirror after this point. 1362 if (log_is_enabled(Info, aot, heap)) { 1363 ResourceMark rm; 1364 log_info(aot, heap)("initialize_from_archived_subgraph %s " PTR_FORMAT "%s%s", 1365 k->external_name(), p2i(k), JvmtiExport::is_early_phase() ? " (early)" : "", 1366 k->has_aot_initialized_mirror() ? " (aot-inited)" : ""); 1367 } 1368 } 1369 1370 verify_the_heap(k, "after "); 1371 } 1372 1373 void HeapShared::clear_archived_roots_of(Klass* k) { 1374 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(k); 1375 const ArchivedKlassSubGraphInfoRecord* record = _run_time_subgraph_info_table.lookup(k, hash, 0); 1376 if (record != nullptr) { 1377 Array<int>* entry_field_records = record->entry_field_records(); 1378 if (entry_field_records != nullptr) { 1379 int efr_len = entry_field_records->length(); 1380 assert(efr_len % 2 == 0, "sanity"); 1381 for (int i = 0; i < efr_len; i += 2) { 1382 int root_index = entry_field_records->at(i+1); 1383 clear_root(root_index); 1384 } 1385 } 1386 } 1387 } 1388 1389 // Push all oop fields (or oop array elemenets in case of an objArray) in 1390 // _referencing_obj onto the _stack. 1391 class HeapShared::OopFieldPusher: public BasicOopIterateClosure { 1392 PendingOopStack* _stack; 1393 GrowableArray<oop> _found_oop_fields; 1394 int _level; 1395 bool _record_klasses_only; 1396 KlassSubGraphInfo* _subgraph_info; 1397 oop _referencing_obj; 1398 bool _is_java_lang_ref; 1399 public: 1400 OopFieldPusher(PendingOopStack* stack, 1401 int level, 1402 bool record_klasses_only, 1403 KlassSubGraphInfo* subgraph_info, 1404 oop orig) : 1405 _stack(stack), 1406 _found_oop_fields(), 1407 _level(level), 1408 _record_klasses_only(record_klasses_only), 1409 _subgraph_info(subgraph_info), 1410 _referencing_obj(orig) { 1411 _is_java_lang_ref = AOTReferenceObjSupport::check_if_ref_obj(orig); 1412 } 1413 void do_oop(narrowOop *p) { OopFieldPusher::do_oop_work(p); } 1414 void do_oop( oop *p) { OopFieldPusher::do_oop_work(p); } 1415 1416 ~OopFieldPusher() { 1417 while (_found_oop_fields.length() > 0) { 1418 // This produces the exact same traversal order as the previous version 1419 // of OopFieldPusher that recurses on the C stack -- a depth-first search, 1420 // walking the oop fields in _referencing_obj by ascending field offsets. 1421 oop obj = _found_oop_fields.pop(); 1422 _stack->push(PendingOop(obj, _referencing_obj, _level + 1)); 1423 } 1424 } 1425 1426 protected: 1427 template <class T> void do_oop_work(T *p) { 1428 int field_offset = pointer_delta_as_int((char*)p, cast_from_oop<char*>(_referencing_obj)); 1429 oop obj = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_load_at(_referencing_obj, field_offset); 1430 if (!CompressedOops::is_null(obj)) { 1431 if (_is_java_lang_ref && AOTReferenceObjSupport::skip_field(field_offset)) { 1432 // Do not follow these fields. They will be cleared to null. 1433 return; 1434 } 1435 1436 if (!_record_klasses_only && log_is_enabled(Debug, aot, heap)) { 1437 ResourceMark rm; 1438 log_debug(aot, heap)("(%d) %s[%d] ==> " PTR_FORMAT " size %zu %s", _level, 1439 _referencing_obj->klass()->external_name(), field_offset, 1440 p2i(obj), obj->size() * HeapWordSize, obj->klass()->external_name()); 1441 if (log_is_enabled(Trace, aot, heap)) { 1442 LogTarget(Trace, aot, heap) log; 1443 LogStream out(log); 1444 obj->print_on(&out); 1445 } 1446 } 1447 1448 _found_oop_fields.push(obj); 1449 } 1450 } 1451 1452 public: 1453 oop referencing_obj() { return _referencing_obj; } 1454 KlassSubGraphInfo* subgraph_info() { return _subgraph_info; } 1455 }; 1456 1457 // Checks if an oop has any non-null oop fields 1458 class PointsToOopsChecker : public BasicOopIterateClosure { 1459 bool _result; 1460 1461 template <class T> void check(T *p) { 1462 _result |= (HeapAccess<>::oop_load(p) != nullptr); 1463 } 1464 1465 public: 1466 PointsToOopsChecker() : _result(false) {} 1467 void do_oop(narrowOop *p) { check(p); } 1468 void do_oop( oop *p) { check(p); } 1469 bool result() { return _result; } 1470 }; 1471 1472 HeapShared::CachedOopInfo HeapShared::make_cached_oop_info(oop obj, oop referrer) { 1473 PointsToOopsChecker points_to_oops_checker; 1474 obj->oop_iterate(&points_to_oops_checker); 1475 return CachedOopInfo(referrer, points_to_oops_checker.result()); 1476 } 1477 1478 void HeapShared::init_box_classes(TRAPS) { 1479 if (ArchiveHeapLoader::is_in_use()) { 1480 vmClasses::Boolean_klass()->initialize(CHECK); 1481 vmClasses::Character_klass()->initialize(CHECK); 1482 vmClasses::Float_klass()->initialize(CHECK); 1483 vmClasses::Double_klass()->initialize(CHECK); 1484 vmClasses::Byte_klass()->initialize(CHECK); 1485 vmClasses::Short_klass()->initialize(CHECK); 1486 vmClasses::Integer_klass()->initialize(CHECK); 1487 vmClasses::Long_klass()->initialize(CHECK); 1488 vmClasses::Void_klass()->initialize(CHECK); 1489 } 1490 } 1491 1492 // (1) If orig_obj has not been archived yet, archive it. 1493 // (2) If orig_obj has not been seen yet (since start_recording_subgraph() was called), 1494 // trace all objects that are reachable from it, and make sure these objects are archived. 1495 // (3) Record the klasses of all objects that are reachable from orig_obj (including those that 1496 // were already archived when this function is called) 1497 bool HeapShared::archive_reachable_objects_from(int level, 1498 KlassSubGraphInfo* subgraph_info, 1499 oop orig_obj) { 1500 assert(orig_obj != nullptr, "must be"); 1501 PendingOopStack stack; 1502 stack.push(PendingOop(orig_obj, nullptr, level)); 1503 1504 while (stack.length() > 0) { 1505 PendingOop po = stack.pop(); 1506 _object_being_archived = po; 1507 bool status = walk_one_object(&stack, po.level(), subgraph_info, po.obj(), po.referrer()); 1508 _object_being_archived = PendingOop(); 1509 1510 if (!status) { 1511 // Don't archive a subgraph root that's too big. For archives static fields, that's OK 1512 // as the Java code will take care of initializing this field dynamically. 1513 assert(level == 1, "VM should have exited with unarchivable objects for _level > 1"); 1514 return false; 1515 } 1516 } 1517 1518 return true; 1519 } 1520 1521 bool HeapShared::walk_one_object(PendingOopStack* stack, int level, KlassSubGraphInfo* subgraph_info, 1522 oop orig_obj, oop referrer) { 1523 assert(orig_obj != nullptr, "must be"); 1524 if (!JavaClasses::is_supported_for_archiving(orig_obj)) { 1525 // This object has injected fields that cannot be supported easily, so we disallow them for now. 1526 // If you get an error here, you probably made a change in the JDK library that has added 1527 // these objects that are referenced (directly or indirectly) by static fields. 1528 ResourceMark rm; 1529 log_error(aot, heap)("Cannot archive object " PTR_FORMAT " of class %s", p2i(orig_obj), orig_obj->klass()->external_name()); 1530 debug_trace(); 1531 MetaspaceShared::unrecoverable_writing_error(); 1532 } 1533 1534 if (log_is_enabled(Debug, aot, heap) && java_lang_Class::is_instance(orig_obj)) { 1535 ResourceMark rm; 1536 LogTarget(Debug, aot, heap) log; 1537 LogStream out(log); 1538 out.print("Found java mirror " PTR_FORMAT " ", p2i(orig_obj)); 1539 Klass* k = java_lang_Class::as_Klass(orig_obj); 1540 if (k != nullptr) { 1541 out.print("%s", k->external_name()); 1542 } else { 1543 out.print("primitive"); 1544 } 1545 out.print_cr("; scratch mirror = " PTR_FORMAT, 1546 p2i(scratch_java_mirror(orig_obj))); 1547 } 1548 1549 if (java_lang_Class::is_instance(orig_obj)) { 1550 Klass* k = java_lang_Class::as_Klass(orig_obj); 1551 if (RegeneratedClasses::has_been_regenerated(k)) { 1552 orig_obj = RegeneratedClasses::get_regenerated_object(k)->java_mirror(); 1553 } 1554 } 1555 1556 if (CDSConfig::is_initing_classes_at_dump_time()) { 1557 if (java_lang_Class::is_instance(orig_obj)) { 1558 orig_obj = scratch_java_mirror(orig_obj); 1559 assert(orig_obj != nullptr, "must be archived"); 1560 } 1561 } else if (java_lang_Class::is_instance(orig_obj) && subgraph_info != _dump_time_special_subgraph) { 1562 // Without CDSConfig::is_initing_classes_at_dump_time(), we only allow archived objects to 1563 // point to the mirrors of (1) j.l.Object, (2) primitive classes, and (3) box classes. These are initialized 1564 // very early by HeapShared::init_box_classes(). 1565 if (orig_obj == vmClasses::Object_klass()->java_mirror() 1566 || java_lang_Class::is_primitive(orig_obj) 1567 || orig_obj == vmClasses::Boolean_klass()->java_mirror() 1568 || orig_obj == vmClasses::Character_klass()->java_mirror() 1569 || orig_obj == vmClasses::Float_klass()->java_mirror() 1570 || orig_obj == vmClasses::Double_klass()->java_mirror() 1571 || orig_obj == vmClasses::Byte_klass()->java_mirror() 1572 || orig_obj == vmClasses::Short_klass()->java_mirror() 1573 || orig_obj == vmClasses::Integer_klass()->java_mirror() 1574 || orig_obj == vmClasses::Long_klass()->java_mirror() 1575 || orig_obj == vmClasses::Void_klass()->java_mirror()) { 1576 orig_obj = scratch_java_mirror(orig_obj); 1577 assert(orig_obj != nullptr, "must be archived"); 1578 } else { 1579 // If you get an error here, you probably made a change in the JDK library that has added a Class 1580 // object that is referenced (directly or indirectly) by an ArchivableStaticFieldInfo 1581 // defined at the top of this file. 1582 log_error(aot, heap)("(%d) Unknown java.lang.Class object is in the archived sub-graph", level); 1583 debug_trace(); 1584 MetaspaceShared::unrecoverable_writing_error(); 1585 } 1586 } 1587 1588 if (has_been_seen_during_subgraph_recording(orig_obj)) { 1589 // orig_obj has already been archived and traced. Nothing more to do. 1590 return true; 1591 } else { 1592 set_has_been_seen_during_subgraph_recording(orig_obj); 1593 } 1594 1595 bool already_archived = has_been_archived(orig_obj); 1596 bool record_klasses_only = already_archived; 1597 if (!already_archived) { 1598 ++_num_new_archived_objs; 1599 if (!archive_object(orig_obj, referrer, subgraph_info)) { 1600 // Skip archiving the sub-graph referenced from the current entry field. 1601 ResourceMark rm; 1602 log_error(aot, heap)( 1603 "Cannot archive the sub-graph referenced from %s object (" 1604 PTR_FORMAT ") size %zu, skipped.", 1605 orig_obj->klass()->external_name(), p2i(orig_obj), orig_obj->size() * HeapWordSize); 1606 if (level == 1) { 1607 // Don't archive a subgraph root that's too big. For archives static fields, that's OK 1608 // as the Java code will take care of initializing this field dynamically. 1609 return false; 1610 } else { 1611 // We don't know how to handle an object that has been archived, but some of its reachable 1612 // objects cannot be archived. Bail out for now. We might need to fix this in the future if 1613 // we have a real use case. 1614 MetaspaceShared::unrecoverable_writing_error(); 1615 } 1616 } 1617 } 1618 1619 Klass *orig_k = orig_obj->klass(); 1620 subgraph_info->add_subgraph_object_klass(orig_k); 1621 1622 { 1623 // Find all the oops that are referenced by orig_obj, push them onto the stack 1624 // so we can work on them next. 1625 ResourceMark rm; 1626 OopFieldPusher pusher(stack, level, record_klasses_only, subgraph_info, orig_obj); 1627 orig_obj->oop_iterate(&pusher); 1628 } 1629 1630 if (CDSConfig::is_initing_classes_at_dump_time()) { 1631 // The enum klasses are archived with aot-initialized mirror. 1632 // See AOTClassInitializer::can_archive_initialized_mirror(). 1633 } else { 1634 if (CDSEnumKlass::is_enum_obj(orig_obj)) { 1635 CDSEnumKlass::handle_enum_obj(level + 1, subgraph_info, orig_obj); 1636 } 1637 } 1638 1639 return true; 1640 } 1641 1642 // 1643 // Start from the given static field in a java mirror and archive the 1644 // complete sub-graph of java heap objects that are reached directly 1645 // or indirectly from the starting object by following references. 1646 // Sub-graph archiving restrictions (current): 1647 // 1648 // - All classes of objects in the archived sub-graph (including the 1649 // entry class) must be boot class only. 1650 // - No java.lang.Class instance (java mirror) can be included inside 1651 // an archived sub-graph. Mirror can only be the sub-graph entry object. 1652 // 1653 // The Java heap object sub-graph archiving process (see OopFieldPusher): 1654 // 1655 // 1) Java object sub-graph archiving starts from a given static field 1656 // within a Class instance (java mirror). If the static field is a 1657 // reference field and points to a non-null java object, proceed to 1658 // the next step. 1659 // 1660 // 2) Archives the referenced java object. If an archived copy of the 1661 // current object already exists, updates the pointer in the archived 1662 // copy of the referencing object to point to the current archived object. 1663 // Otherwise, proceed to the next step. 1664 // 1665 // 3) Follows all references within the current java object and recursively 1666 // archive the sub-graph of objects starting from each reference. 1667 // 1668 // 4) Updates the pointer in the archived copy of referencing object to 1669 // point to the current archived object. 1670 // 1671 // 5) The Klass of the current java object is added to the list of Klasses 1672 // for loading and initializing before any object in the archived graph can 1673 // be accessed at runtime. 1674 // 1675 void HeapShared::archive_reachable_objects_from_static_field(InstanceKlass *k, 1676 const char* klass_name, 1677 int field_offset, 1678 const char* field_name) { 1679 assert(CDSConfig::is_dumping_heap(), "dump time only"); 1680 assert(k->defined_by_boot_loader(), "must be boot class"); 1681 1682 oop m = k->java_mirror(); 1683 1684 KlassSubGraphInfo* subgraph_info = get_subgraph_info(k); 1685 oop f = m->obj_field(field_offset); 1686 1687 log_debug(aot, heap)("Start archiving from: %s::%s (" PTR_FORMAT ")", klass_name, field_name, p2i(f)); 1688 1689 if (!CompressedOops::is_null(f)) { 1690 if (log_is_enabled(Trace, aot, heap)) { 1691 LogTarget(Trace, aot, heap) log; 1692 LogStream out(log); 1693 f->print_on(&out); 1694 } 1695 1696 bool success = archive_reachable_objects_from(1, subgraph_info, f); 1697 if (!success) { 1698 log_error(aot, heap)("Archiving failed %s::%s (some reachable objects cannot be archived)", 1699 klass_name, field_name); 1700 } else { 1701 // Note: the field value is not preserved in the archived mirror. 1702 // Record the field as a new subGraph entry point. The recorded 1703 // information is restored from the archive at runtime. 1704 subgraph_info->add_subgraph_entry_field(field_offset, f); 1705 log_info(aot, heap)("Archived field %s::%s => " PTR_FORMAT, klass_name, field_name, p2i(f)); 1706 } 1707 } else { 1708 // The field contains null, we still need to record the entry point, 1709 // so it can be restored at runtime. 1710 subgraph_info->add_subgraph_entry_field(field_offset, nullptr); 1711 } 1712 } 1713 1714 #ifndef PRODUCT 1715 class VerifySharedOopClosure: public BasicOopIterateClosure { 1716 public: 1717 void do_oop(narrowOop *p) { VerifySharedOopClosure::do_oop_work(p); } 1718 void do_oop( oop *p) { VerifySharedOopClosure::do_oop_work(p); } 1719 1720 protected: 1721 template <class T> void do_oop_work(T *p) { 1722 oop obj = RawAccess<>::oop_load(p); 1723 if (!CompressedOops::is_null(obj)) { 1724 HeapShared::verify_reachable_objects_from(obj); 1725 } 1726 } 1727 }; 1728 1729 void HeapShared::verify_subgraph_from_static_field(InstanceKlass* k, int field_offset) { 1730 assert(CDSConfig::is_dumping_heap(), "dump time only"); 1731 assert(k->defined_by_boot_loader(), "must be boot class"); 1732 1733 oop m = k->java_mirror(); 1734 oop f = m->obj_field(field_offset); 1735 if (!CompressedOops::is_null(f)) { 1736 verify_subgraph_from(f); 1737 } 1738 } 1739 1740 void HeapShared::verify_subgraph_from(oop orig_obj) { 1741 if (!has_been_archived(orig_obj)) { 1742 // It's OK for the root of a subgraph to be not archived. See comments in 1743 // archive_reachable_objects_from(). 1744 return; 1745 } 1746 1747 // Verify that all objects reachable from orig_obj are archived. 1748 init_seen_objects_table(); 1749 verify_reachable_objects_from(orig_obj); 1750 delete_seen_objects_table(); 1751 } 1752 1753 void HeapShared::verify_reachable_objects_from(oop obj) { 1754 _num_total_verifications ++; 1755 if (java_lang_Class::is_instance(obj)) { 1756 obj = scratch_java_mirror(obj); 1757 assert(obj != nullptr, "must be"); 1758 } 1759 if (!has_been_seen_during_subgraph_recording(obj)) { 1760 set_has_been_seen_during_subgraph_recording(obj); 1761 assert(has_been_archived(obj), "must be"); 1762 VerifySharedOopClosure walker; 1763 obj->oop_iterate(&walker); 1764 } 1765 } 1766 #endif 1767 1768 void HeapShared::check_special_subgraph_classes() { 1769 if (CDSConfig::is_initing_classes_at_dump_time()) { 1770 // We can have aot-initialized classes (such as Enums) that can reference objects 1771 // of arbitrary types. Currently, we trust the JEP 483 implementation to only 1772 // aot-initialize classes that are "safe". 1773 // 1774 // TODO: we need an automatic tool that checks the safety of aot-initialized 1775 // classes (when we extend the set of aot-initialized classes beyond JEP 483) 1776 return; 1777 } else { 1778 // In this case, the special subgraph should contain a few specific types 1779 GrowableArray<Klass*>* klasses = _dump_time_special_subgraph->subgraph_object_klasses(); 1780 int num = klasses->length(); 1781 for (int i = 0; i < num; i++) { 1782 Klass* subgraph_k = klasses->at(i); 1783 Symbol* name = subgraph_k->name(); 1784 if (subgraph_k->is_instance_klass() && 1785 name != vmSymbols::java_lang_Class() && 1786 name != vmSymbols::java_lang_String() && 1787 name != vmSymbols::java_lang_ArithmeticException() && 1788 name != vmSymbols::java_lang_ArrayIndexOutOfBoundsException() && 1789 name != vmSymbols::java_lang_ArrayStoreException() && 1790 name != vmSymbols::java_lang_ClassCastException() && 1791 name != vmSymbols::java_lang_InternalError() && 1792 name != vmSymbols::java_lang_NullPointerException()) { 1793 ResourceMark rm; 1794 fatal("special subgraph cannot have objects of type %s", subgraph_k->external_name()); 1795 } 1796 } 1797 } 1798 } 1799 1800 HeapShared::SeenObjectsTable* HeapShared::_seen_objects_table = nullptr; 1801 HeapShared::PendingOop HeapShared::_object_being_archived; 1802 int HeapShared::_num_new_walked_objs; 1803 int HeapShared::_num_new_archived_objs; 1804 int HeapShared::_num_old_recorded_klasses; 1805 1806 int HeapShared::_num_total_subgraph_recordings = 0; 1807 int HeapShared::_num_total_walked_objs = 0; 1808 int HeapShared::_num_total_archived_objs = 0; 1809 int HeapShared::_num_total_recorded_klasses = 0; 1810 int HeapShared::_num_total_verifications = 0; 1811 1812 bool HeapShared::has_been_seen_during_subgraph_recording(oop obj) { 1813 return _seen_objects_table->get(obj) != nullptr; 1814 } 1815 1816 void HeapShared::set_has_been_seen_during_subgraph_recording(oop obj) { 1817 assert(!has_been_seen_during_subgraph_recording(obj), "sanity"); 1818 _seen_objects_table->put_when_absent(obj, true); 1819 _seen_objects_table->maybe_grow(); 1820 ++ _num_new_walked_objs; 1821 } 1822 1823 void HeapShared::start_recording_subgraph(InstanceKlass *k, const char* class_name, bool is_full_module_graph) { 1824 log_info(aot, heap)("Start recording subgraph(s) for archived fields in %s", class_name); 1825 init_subgraph_info(k, is_full_module_graph); 1826 init_seen_objects_table(); 1827 _num_new_walked_objs = 0; 1828 _num_new_archived_objs = 0; 1829 _num_old_recorded_klasses = get_subgraph_info(k)->num_subgraph_object_klasses(); 1830 } 1831 1832 void HeapShared::done_recording_subgraph(InstanceKlass *k, const char* class_name) { 1833 int num_new_recorded_klasses = get_subgraph_info(k)->num_subgraph_object_klasses() - 1834 _num_old_recorded_klasses; 1835 log_info(aot, heap)("Done recording subgraph(s) for archived fields in %s: " 1836 "walked %d objs, archived %d new objs, recorded %d classes", 1837 class_name, _num_new_walked_objs, _num_new_archived_objs, 1838 num_new_recorded_klasses); 1839 1840 delete_seen_objects_table(); 1841 1842 _num_total_subgraph_recordings ++; 1843 _num_total_walked_objs += _num_new_walked_objs; 1844 _num_total_archived_objs += _num_new_archived_objs; 1845 _num_total_recorded_klasses += num_new_recorded_klasses; 1846 } 1847 1848 class ArchivableStaticFieldFinder: public FieldClosure { 1849 InstanceKlass* _ik; 1850 Symbol* _field_name; 1851 bool _found; 1852 int _offset; 1853 public: 1854 ArchivableStaticFieldFinder(InstanceKlass* ik, Symbol* field_name) : 1855 _ik(ik), _field_name(field_name), _found(false), _offset(-1) {} 1856 1857 virtual void do_field(fieldDescriptor* fd) { 1858 if (fd->name() == _field_name) { 1859 assert(!_found, "fields can never be overloaded"); 1860 if (is_reference_type(fd->field_type())) { 1861 _found = true; 1862 _offset = fd->offset(); 1863 } 1864 } 1865 } 1866 bool found() { return _found; } 1867 int offset() { return _offset; } 1868 }; 1869 1870 void HeapShared::init_subgraph_entry_fields(ArchivableStaticFieldInfo fields[], 1871 TRAPS) { 1872 for (int i = 0; fields[i].valid(); i++) { 1873 ArchivableStaticFieldInfo* info = &fields[i]; 1874 TempNewSymbol klass_name = SymbolTable::new_symbol(info->klass_name); 1875 TempNewSymbol field_name = SymbolTable::new_symbol(info->field_name); 1876 ResourceMark rm; // for stringStream::as_string() etc. 1877 1878 #ifndef PRODUCT 1879 bool is_test_class = (ArchiveHeapTestClass != nullptr) && (strcmp(info->klass_name, ArchiveHeapTestClass) == 0); 1880 const char* test_class_name = ArchiveHeapTestClass; 1881 #else 1882 bool is_test_class = false; 1883 const char* test_class_name = ""; // avoid C++ printf checks warnings. 1884 #endif 1885 1886 if (is_test_class) { 1887 log_warning(aot)("Loading ArchiveHeapTestClass %s ...", test_class_name); 1888 } 1889 1890 Klass* k = SystemDictionary::resolve_or_fail(klass_name, true, THREAD); 1891 if (HAS_PENDING_EXCEPTION) { 1892 CLEAR_PENDING_EXCEPTION; 1893 stringStream st; 1894 st.print("Fail to initialize archive heap: %s cannot be loaded by the boot loader", info->klass_name); 1895 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1896 } 1897 1898 if (!k->is_instance_klass()) { 1899 stringStream st; 1900 st.print("Fail to initialize archive heap: %s is not an instance class", info->klass_name); 1901 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1902 } 1903 1904 InstanceKlass* ik = InstanceKlass::cast(k); 1905 assert(InstanceKlass::cast(ik)->defined_by_boot_loader(), 1906 "Only support boot classes"); 1907 1908 if (is_test_class) { 1909 if (ik->module()->is_named()) { 1910 // We don't want ArchiveHeapTestClass to be abused to easily load/initialize arbitrary 1911 // core-lib classes. You need to at least append to the bootclasspath. 1912 stringStream st; 1913 st.print("ArchiveHeapTestClass %s is not in unnamed module", test_class_name); 1914 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1915 } 1916 1917 if (ik->package() != nullptr) { 1918 // This restriction makes HeapShared::is_a_test_class_in_unnamed_module() easy. 1919 stringStream st; 1920 st.print("ArchiveHeapTestClass %s is not in unnamed package", test_class_name); 1921 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1922 } 1923 } else { 1924 if (ik->module()->name() != vmSymbols::java_base()) { 1925 // We don't want to deal with cases when a module is unavailable at runtime. 1926 // FUTURE -- load from archived heap only when module graph has not changed 1927 // between dump and runtime. 1928 stringStream st; 1929 st.print("%s is not in java.base module", info->klass_name); 1930 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1931 } 1932 } 1933 1934 if (is_test_class) { 1935 log_warning(aot)("Initializing ArchiveHeapTestClass %s ...", test_class_name); 1936 } 1937 ik->initialize(CHECK); 1938 1939 ArchivableStaticFieldFinder finder(ik, field_name); 1940 ik->do_local_static_fields(&finder); 1941 if (!finder.found()) { 1942 stringStream st; 1943 st.print("Unable to find the static T_OBJECT field %s::%s", info->klass_name, info->field_name); 1944 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1945 } 1946 1947 info->klass = ik; 1948 info->offset = finder.offset(); 1949 } 1950 } 1951 1952 void HeapShared::init_subgraph_entry_fields(TRAPS) { 1953 assert(CDSConfig::is_dumping_heap(), "must be"); 1954 _dump_time_subgraph_info_table = new (mtClass)DumpTimeKlassSubGraphInfoTable(); 1955 init_subgraph_entry_fields(archive_subgraph_entry_fields, CHECK); 1956 if (CDSConfig::is_dumping_full_module_graph()) { 1957 init_subgraph_entry_fields(fmg_archive_subgraph_entry_fields, CHECK); 1958 } 1959 } 1960 1961 #ifndef PRODUCT 1962 void HeapShared::setup_test_class(const char* test_class_name) { 1963 ArchivableStaticFieldInfo* p = archive_subgraph_entry_fields; 1964 int num_slots = sizeof(archive_subgraph_entry_fields) / sizeof(ArchivableStaticFieldInfo); 1965 assert(p[num_slots - 2].klass_name == nullptr, "must have empty slot that's patched below"); 1966 assert(p[num_slots - 1].klass_name == nullptr, "must have empty slot that marks the end of the list"); 1967 1968 if (test_class_name != nullptr) { 1969 p[num_slots - 2].klass_name = test_class_name; 1970 p[num_slots - 2].field_name = ARCHIVE_TEST_FIELD_NAME; 1971 } 1972 } 1973 1974 // See if ik is one of the test classes that are pulled in by -XX:ArchiveHeapTestClass 1975 // during runtime. This may be called before the module system is initialized so 1976 // we cannot rely on InstanceKlass::module(), etc. 1977 bool HeapShared::is_a_test_class_in_unnamed_module(Klass* ik) { 1978 if (_test_class != nullptr) { 1979 if (ik == _test_class) { 1980 return true; 1981 } 1982 Array<Klass*>* klasses = _test_class_record->subgraph_object_klasses(); 1983 if (klasses == nullptr) { 1984 return false; 1985 } 1986 1987 for (int i = 0; i < klasses->length(); i++) { 1988 Klass* k = klasses->at(i); 1989 if (k == ik) { 1990 Symbol* name; 1991 if (k->is_instance_klass()) { 1992 name = InstanceKlass::cast(k)->name(); 1993 } else if (k->is_objArray_klass()) { 1994 Klass* bk = ObjArrayKlass::cast(k)->bottom_klass(); 1995 if (!bk->is_instance_klass()) { 1996 return false; 1997 } 1998 name = bk->name(); 1999 } else { 2000 return false; 2001 } 2002 2003 // See KlassSubGraphInfo::check_allowed_klass() - we only allow test classes 2004 // to be: 2005 // (A) java.base classes (which must not be in the unnamed module) 2006 // (B) test classes which must be in the unnamed package of the unnamed module. 2007 // So if we see a '/' character in the class name, it must be in (A); 2008 // otherwise it must be in (B). 2009 if (name->index_of_at(0, "/", 1) >= 0) { 2010 return false; // (A) 2011 } 2012 2013 return true; // (B) 2014 } 2015 } 2016 } 2017 2018 return false; 2019 } 2020 2021 void HeapShared::initialize_test_class_from_archive(JavaThread* current) { 2022 Klass* k = _test_class; 2023 if (k != nullptr && ArchiveHeapLoader::is_in_use()) { 2024 JavaThread* THREAD = current; 2025 ExceptionMark em(THREAD); 2026 const ArchivedKlassSubGraphInfoRecord* record = 2027 resolve_or_init_classes_for_subgraph_of(k, /*do_init=*/false, THREAD); 2028 2029 // The _test_class is in the unnamed module, so it can't call CDS.initializeFromArchive() 2030 // from its <clinit> method. So we set up its "archivedObjects" field first, before 2031 // calling its <clinit>. This is not strictly clean, but it's a convenient way to write unit 2032 // test cases (see test/hotspot/jtreg/runtime/cds/appcds/cacheObject/ArchiveHeapTestClass.java). 2033 if (record != nullptr) { 2034 init_archived_fields_for(k, record); 2035 } 2036 resolve_or_init_classes_for_subgraph_of(k, /*do_init=*/true, THREAD); 2037 } 2038 } 2039 #endif 2040 2041 void HeapShared::init_for_dumping(TRAPS) { 2042 if (CDSConfig::is_dumping_heap()) { 2043 setup_test_class(ArchiveHeapTestClass); 2044 _dumped_interned_strings = new (mtClass)DumpedInternedStrings(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE); 2045 init_subgraph_entry_fields(CHECK); 2046 } 2047 } 2048 2049 void HeapShared::archive_object_subgraphs(ArchivableStaticFieldInfo fields[], 2050 bool is_full_module_graph) { 2051 _num_total_subgraph_recordings = 0; 2052 _num_total_walked_objs = 0; 2053 _num_total_archived_objs = 0; 2054 _num_total_recorded_klasses = 0; 2055 _num_total_verifications = 0; 2056 2057 // For each class X that has one or more archived fields: 2058 // [1] Dump the subgraph of each archived field 2059 // [2] Create a list of all the class of the objects that can be reached 2060 // by any of these static fields. 2061 // At runtime, these classes are initialized before X's archived fields 2062 // are restored by HeapShared::initialize_from_archived_subgraph(). 2063 for (int i = 0; fields[i].valid(); ) { 2064 ArchivableStaticFieldInfo* info = &fields[i]; 2065 const char* klass_name = info->klass_name; 2066 start_recording_subgraph(info->klass, klass_name, is_full_module_graph); 2067 2068 // If you have specified consecutive fields of the same klass in 2069 // fields[], these will be archived in the same 2070 // {start_recording_subgraph ... done_recording_subgraph} pass to 2071 // save time. 2072 for (; fields[i].valid(); i++) { 2073 ArchivableStaticFieldInfo* f = &fields[i]; 2074 if (f->klass_name != klass_name) { 2075 break; 2076 } 2077 2078 archive_reachable_objects_from_static_field(f->klass, f->klass_name, 2079 f->offset, f->field_name); 2080 } 2081 done_recording_subgraph(info->klass, klass_name); 2082 } 2083 2084 log_info(aot, heap)("Archived subgraph records = %d", 2085 _num_total_subgraph_recordings); 2086 log_info(aot, heap)(" Walked %d objects", _num_total_walked_objs); 2087 log_info(aot, heap)(" Archived %d objects", _num_total_archived_objs); 2088 log_info(aot, heap)(" Recorded %d klasses", _num_total_recorded_klasses); 2089 2090 #ifndef PRODUCT 2091 for (int i = 0; fields[i].valid(); i++) { 2092 ArchivableStaticFieldInfo* f = &fields[i]; 2093 verify_subgraph_from_static_field(f->klass, f->offset); 2094 } 2095 log_info(aot, heap)(" Verified %d references", _num_total_verifications); 2096 #endif 2097 } 2098 2099 // Keep track of the contents of the archived interned string table. This table 2100 // is used only by CDSHeapVerifier. 2101 void HeapShared::add_to_dumped_interned_strings(oop string) { 2102 assert_at_safepoint(); // DumpedInternedStrings uses raw oops 2103 assert(!ArchiveHeapWriter::is_string_too_large_to_archive(string), "must be"); 2104 bool created; 2105 _dumped_interned_strings->put_if_absent(string, true, &created); 2106 if (created) { 2107 // Prevent string deduplication from changing the value field to 2108 // something not in the archive. 2109 java_lang_String::set_deduplication_forbidden(string); 2110 _dumped_interned_strings->maybe_grow(); 2111 } 2112 } 2113 2114 bool HeapShared::is_dumped_interned_string(oop o) { 2115 return _dumped_interned_strings->get(o) != nullptr; 2116 } 2117 2118 void HeapShared::debug_trace() { 2119 ResourceMark rm; 2120 oop referrer = _object_being_archived.referrer(); 2121 if (referrer != nullptr) { 2122 LogStream ls(Log(aot, heap)::error()); 2123 ls.print_cr("Reference trace"); 2124 CDSHeapVerifier::trace_to_root(&ls, referrer); 2125 } 2126 } 2127 2128 #ifndef PRODUCT 2129 // At dump-time, find the location of all the non-null oop pointers in an archived heap 2130 // region. This way we can quickly relocate all the pointers without using 2131 // BasicOopIterateClosure at runtime. 2132 class FindEmbeddedNonNullPointers: public BasicOopIterateClosure { 2133 void* _start; 2134 BitMap *_oopmap; 2135 int _num_total_oops; 2136 int _num_null_oops; 2137 public: 2138 FindEmbeddedNonNullPointers(void* start, BitMap* oopmap) 2139 : _start(start), _oopmap(oopmap), _num_total_oops(0), _num_null_oops(0) {} 2140 2141 virtual void do_oop(narrowOop* p) { 2142 assert(UseCompressedOops, "sanity"); 2143 _num_total_oops ++; 2144 narrowOop v = *p; 2145 if (!CompressedOops::is_null(v)) { 2146 size_t idx = p - (narrowOop*)_start; 2147 _oopmap->set_bit(idx); 2148 } else { 2149 _num_null_oops ++; 2150 } 2151 } 2152 virtual void do_oop(oop* p) { 2153 assert(!UseCompressedOops, "sanity"); 2154 _num_total_oops ++; 2155 if ((*p) != nullptr) { 2156 size_t idx = p - (oop*)_start; 2157 _oopmap->set_bit(idx); 2158 } else { 2159 _num_null_oops ++; 2160 } 2161 } 2162 int num_total_oops() const { return _num_total_oops; } 2163 int num_null_oops() const { return _num_null_oops; } 2164 }; 2165 #endif 2166 2167 void HeapShared::count_allocation(size_t size) { 2168 _total_obj_count ++; 2169 _total_obj_size += size; 2170 for (int i = 0; i < ALLOC_STAT_SLOTS; i++) { 2171 if (size <= (size_t(1) << i)) { 2172 _alloc_count[i] ++; 2173 _alloc_size[i] += size; 2174 return; 2175 } 2176 } 2177 } 2178 2179 static double avg_size(size_t size, size_t count) { 2180 double avg = 0; 2181 if (count > 0) { 2182 avg = double(size * HeapWordSize) / double(count); 2183 } 2184 return avg; 2185 } 2186 2187 void HeapShared::print_stats() { 2188 size_t huge_count = _total_obj_count; 2189 size_t huge_size = _total_obj_size; 2190 2191 for (int i = 0; i < ALLOC_STAT_SLOTS; i++) { 2192 size_t byte_size_limit = (size_t(1) << i) * HeapWordSize; 2193 size_t count = _alloc_count[i]; 2194 size_t size = _alloc_size[i]; 2195 log_info(aot, heap)("%8zu objects are <= %-6zu" 2196 " bytes (total %8zu bytes, avg %8.1f bytes)", 2197 count, byte_size_limit, size * HeapWordSize, avg_size(size, count)); 2198 huge_count -= count; 2199 huge_size -= size; 2200 } 2201 2202 log_info(aot, heap)("%8zu huge objects (total %8zu bytes" 2203 ", avg %8.1f bytes)", 2204 huge_count, huge_size * HeapWordSize, 2205 avg_size(huge_size, huge_count)); 2206 log_info(aot, heap)("%8zu total objects (total %8zu bytes" 2207 ", avg %8.1f bytes)", 2208 _total_obj_count, _total_obj_size * HeapWordSize, 2209 avg_size(_total_obj_size, _total_obj_count)); 2210 } 2211 2212 bool HeapShared::is_archived_boot_layer_available(JavaThread* current) { 2213 TempNewSymbol klass_name = SymbolTable::new_symbol(ARCHIVED_BOOT_LAYER_CLASS); 2214 InstanceKlass* k = SystemDictionary::find_instance_klass(current, klass_name, Handle()); 2215 if (k == nullptr) { 2216 return false; 2217 } else { 2218 TempNewSymbol field_name = SymbolTable::new_symbol(ARCHIVED_BOOT_LAYER_FIELD); 2219 TempNewSymbol field_signature = SymbolTable::new_symbol("Ljdk/internal/module/ArchivedBootLayer;"); 2220 fieldDescriptor fd; 2221 if (k->find_field(field_name, field_signature, true, &fd) != nullptr) { 2222 oop m = k->java_mirror(); 2223 oop f = m->obj_field(fd.offset()); 2224 if (CompressedOops::is_null(f)) { 2225 return false; 2226 } 2227 } else { 2228 return false; 2229 } 2230 } 2231 return true; 2232 } 2233 2234 #endif // INCLUDE_CDS_JAVA_HEAP