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/aotMetaspace.hpp" 30 #include "cds/aotOopChecker.hpp" 31 #include "cds/aotReferenceObjSupport.hpp" 32 #include "cds/archiveBuilder.hpp" 33 #include "cds/archiveHeapLoader.hpp" 34 #include "cds/archiveHeapWriter.hpp" 35 #include "cds/archiveUtils.hpp" 36 #include "cds/cdsConfig.hpp" 37 #include "cds/cdsEnumKlass.hpp" 38 #include "cds/cdsHeapVerifier.hpp" 39 #include "cds/heapShared.hpp" 40 #include "cds/regeneratedClasses.hpp" 41 #include "classfile/classLoaderData.hpp" 42 #include "classfile/javaClasses.inline.hpp" 43 #include "classfile/modules.hpp" 44 #include "classfile/stringTable.hpp" 45 #include "classfile/symbolTable.hpp" 46 #include "classfile/systemDictionary.hpp" 47 #include "classfile/systemDictionaryShared.hpp" 48 #include "classfile/vmClasses.hpp" 49 #include "classfile/vmSymbols.hpp" 50 #include "gc/shared/collectedHeap.hpp" 51 #include "gc/shared/gcLocker.hpp" 52 #include "gc/shared/gcVMOperations.hpp" 53 #include "logging/log.hpp" 54 #include "logging/logStream.hpp" 55 #include "memory/iterator.inline.hpp" 56 #include "memory/resourceArea.hpp" 57 #include "memory/universe.hpp" 58 #include "oops/compressedOops.inline.hpp" 59 #include "oops/fieldStreams.inline.hpp" 60 #include "oops/objArrayOop.inline.hpp" 61 #include "oops/oop.inline.hpp" 62 #include "oops/oopHandle.inline.hpp" 63 #include "oops/typeArrayOop.inline.hpp" 64 #include "prims/jvmtiExport.hpp" 65 #include "runtime/arguments.hpp" 66 #include "runtime/fieldDescriptor.inline.hpp" 67 #include "runtime/init.hpp" 68 #include "runtime/javaCalls.hpp" 69 #include "runtime/mutexLocker.hpp" 70 #include "runtime/safepointVerifiers.hpp" 71 #include "utilities/bitMap.inline.hpp" 72 #include "utilities/copy.hpp" 73 #if INCLUDE_G1GC 74 #include "gc/g1/g1CollectedHeap.hpp" 75 #endif 76 77 #if INCLUDE_CDS_JAVA_HEAP 78 79 struct ArchivableStaticFieldInfo { 80 const char* klass_name; 81 const char* field_name; 82 InstanceKlass* klass; 83 int offset; 84 BasicType type; 85 86 ArchivableStaticFieldInfo(const char* k, const char* f) 87 : klass_name(k), field_name(f), klass(nullptr), offset(0), type(T_ILLEGAL) {} 88 89 bool valid() { 90 return klass_name != nullptr; 91 } 92 }; 93 94 DumpedInternedStrings *HeapShared::_dumped_interned_strings = nullptr; 95 96 size_t HeapShared::_alloc_count[HeapShared::ALLOC_STAT_SLOTS]; 97 size_t HeapShared::_alloc_size[HeapShared::ALLOC_STAT_SLOTS]; 98 size_t HeapShared::_total_obj_count; 99 size_t HeapShared::_total_obj_size; 100 101 #ifndef PRODUCT 102 #define ARCHIVE_TEST_FIELD_NAME "archivedObjects" 103 static Array<char>* _archived_ArchiveHeapTestClass = nullptr; 104 static const char* _test_class_name = nullptr; 105 static Klass* _test_class = nullptr; 106 static const ArchivedKlassSubGraphInfoRecord* _test_class_record = nullptr; 107 #endif 108 109 110 // 111 // If you add new entries to the following tables, you should know what you're doing! 112 // 113 114 static ArchivableStaticFieldInfo archive_subgraph_entry_fields[] = { 115 {"java/lang/Integer$IntegerCache", "archivedCache"}, 116 {"java/lang/Long$LongCache", "archivedCache"}, 117 {"java/lang/Byte$ByteCache", "archivedCache"}, 118 {"java/lang/Short$ShortCache", "archivedCache"}, 119 {"java/lang/Character$CharacterCache", "archivedCache"}, 120 {"java/util/jar/Attributes$Name", "KNOWN_NAMES"}, 121 {"sun/util/locale/BaseLocale", "constantBaseLocales"}, 122 {"jdk/internal/module/ArchivedModuleGraph", "archivedModuleGraph"}, 123 {"java/util/ImmutableCollections", "archivedObjects"}, 124 {"java/lang/ModuleLayer", "EMPTY_LAYER"}, 125 {"java/lang/module/Configuration", "EMPTY_CONFIGURATION"}, 126 {"jdk/internal/math/FDBigInteger", "archivedCaches"}, 127 128 #ifndef PRODUCT 129 {nullptr, nullptr}, // Extra slot for -XX:ArchiveHeapTestClass 130 #endif 131 {nullptr, nullptr}, 132 }; 133 134 // full module graph 135 static ArchivableStaticFieldInfo fmg_archive_subgraph_entry_fields[] = { 136 {"jdk/internal/loader/ArchivedClassLoaders", "archivedClassLoaders"}, 137 {ARCHIVED_BOOT_LAYER_CLASS, ARCHIVED_BOOT_LAYER_FIELD}, 138 {"java/lang/Module$ArchivedData", "archivedData"}, 139 {nullptr, nullptr}, 140 }; 141 142 KlassSubGraphInfo* HeapShared::_dump_time_special_subgraph; 143 ArchivedKlassSubGraphInfoRecord* HeapShared::_run_time_special_subgraph; 144 GrowableArrayCHeap<oop, mtClassShared>* HeapShared::_pending_roots = nullptr; 145 GrowableArrayCHeap<OopHandle, mtClassShared>* HeapShared::_root_segments = nullptr; 146 int HeapShared::_root_segment_max_size_elems; 147 OopHandle HeapShared::_scratch_basic_type_mirrors[T_VOID+1]; 148 MetaspaceObjToOopHandleTable* HeapShared::_scratch_objects_table = nullptr; 149 150 static bool is_subgraph_root_class_of(ArchivableStaticFieldInfo fields[], InstanceKlass* ik) { 151 for (int i = 0; fields[i].valid(); i++) { 152 if (fields[i].klass == ik) { 153 return true; 154 } 155 } 156 return false; 157 } 158 159 bool HeapShared::is_subgraph_root_class(InstanceKlass* ik) { 160 return is_subgraph_root_class_of(archive_subgraph_entry_fields, ik) || 161 is_subgraph_root_class_of(fmg_archive_subgraph_entry_fields, ik); 162 } 163 164 oop HeapShared::CachedOopInfo::orig_referrer() const { 165 return _orig_referrer.resolve(); 166 } 167 168 unsigned HeapShared::oop_hash(oop const& p) { 169 assert(SafepointSynchronize::is_at_safepoint() || 170 JavaThread::current()->is_in_no_safepoint_scope(), "sanity"); 171 // Do not call p->identity_hash() as that will update the 172 // object header. 173 return primitive_hash(cast_from_oop<intptr_t>(p)); 174 } 175 176 unsigned int HeapShared::oop_handle_hash_raw(const OopHandle& oh) { 177 return oop_hash(oh.resolve()); 178 } 179 180 unsigned int HeapShared::oop_handle_hash(const OopHandle& oh) { 181 oop o = oh.resolve(); 182 if (o == nullptr) { 183 return 0; 184 } else { 185 return o->identity_hash(); 186 } 187 } 188 189 bool HeapShared::oop_handle_equals(const OopHandle& a, const OopHandle& b) { 190 return a.resolve() == b.resolve(); 191 } 192 193 static void reset_states(oop obj, TRAPS) { 194 Handle h_obj(THREAD, obj); 195 InstanceKlass* klass = InstanceKlass::cast(obj->klass()); 196 TempNewSymbol method_name = SymbolTable::new_symbol("resetArchivedStates"); 197 Symbol* method_sig = vmSymbols::void_method_signature(); 198 199 while (klass != nullptr) { 200 Method* method = klass->find_method(method_name, method_sig); 201 if (method != nullptr) { 202 assert(method->is_private(), "must be"); 203 if (log_is_enabled(Debug, aot)) { 204 ResourceMark rm(THREAD); 205 log_debug(aot)(" calling %s", method->name_and_sig_as_C_string()); 206 } 207 JavaValue result(T_VOID); 208 JavaCalls::call_special(&result, h_obj, klass, 209 method_name, method_sig, CHECK); 210 } 211 klass = klass->super(); 212 } 213 } 214 215 void HeapShared::reset_archived_object_states(TRAPS) { 216 assert(CDSConfig::is_dumping_heap(), "dump-time only"); 217 log_debug(aot)("Resetting platform loader"); 218 reset_states(SystemDictionary::java_platform_loader(), CHECK); 219 log_debug(aot)("Resetting system loader"); 220 reset_states(SystemDictionary::java_system_loader(), CHECK); 221 222 // Clean up jdk.internal.loader.ClassLoaders::bootLoader(), which is not 223 // directly used for class loading, but rather is used by the core library 224 // to keep track of resources, etc, loaded by the null class loader. 225 // 226 // Note, this object is non-null, and is not the same as 227 // ClassLoaderData::the_null_class_loader_data()->class_loader(), 228 // which is null. 229 log_debug(aot)("Resetting boot loader"); 230 JavaValue result(T_OBJECT); 231 JavaCalls::call_static(&result, 232 vmClasses::jdk_internal_loader_ClassLoaders_klass(), 233 vmSymbols::bootLoader_name(), 234 vmSymbols::void_BuiltinClassLoader_signature(), 235 CHECK); 236 Handle boot_loader(THREAD, result.get_oop()); 237 reset_states(boot_loader(), CHECK); 238 } 239 240 HeapShared::ArchivedObjectCache* HeapShared::_archived_object_cache = nullptr; 241 242 bool HeapShared::has_been_archived(oop obj) { 243 assert(CDSConfig::is_dumping_heap(), "dump-time only"); 244 OopHandle oh(&obj); 245 return archived_object_cache()->get(oh) != nullptr; 246 } 247 248 int HeapShared::append_root(oop obj) { 249 assert(CDSConfig::is_dumping_heap(), "dump-time only"); 250 if (obj != nullptr) { 251 assert(has_been_archived(obj), "must be"); 252 } 253 // No GC should happen since we aren't scanning _pending_roots. 254 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); 255 256 return _pending_roots->append(obj); 257 } 258 259 objArrayOop HeapShared::root_segment(int segment_idx) { 260 if (CDSConfig::is_dumping_heap()) { 261 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); 262 } else { 263 assert(CDSConfig::is_using_archive(), "must be"); 264 } 265 266 objArrayOop segment = (objArrayOop)_root_segments->at(segment_idx).resolve(); 267 assert(segment != nullptr, "should have been initialized"); 268 return segment; 269 } 270 271 void HeapShared::get_segment_indexes(int idx, int& seg_idx, int& int_idx) { 272 assert(_root_segment_max_size_elems > 0, "sanity"); 273 274 // Try to avoid divisions for the common case. 275 if (idx < _root_segment_max_size_elems) { 276 seg_idx = 0; 277 int_idx = idx; 278 } else { 279 seg_idx = idx / _root_segment_max_size_elems; 280 int_idx = idx % _root_segment_max_size_elems; 281 } 282 283 assert(idx == seg_idx * _root_segment_max_size_elems + int_idx, 284 "sanity: %d index maps to %d segment and %d internal", idx, seg_idx, int_idx); 285 } 286 287 // Returns an objArray that contains all the roots of the archived objects 288 oop HeapShared::get_root(int index, bool clear) { 289 assert(index >= 0, "sanity"); 290 assert(!CDSConfig::is_dumping_heap() && CDSConfig::is_using_archive(), "runtime only"); 291 assert(!_root_segments->is_empty(), "must have loaded shared heap"); 292 int seg_idx, int_idx; 293 get_segment_indexes(index, seg_idx, int_idx); 294 oop result = root_segment(seg_idx)->obj_at(int_idx); 295 if (clear) { 296 clear_root(index); 297 } 298 return result; 299 } 300 301 void HeapShared::clear_root(int index) { 302 assert(index >= 0, "sanity"); 303 assert(CDSConfig::is_using_archive(), "must be"); 304 if (ArchiveHeapLoader::is_in_use()) { 305 int seg_idx, int_idx; 306 get_segment_indexes(index, seg_idx, int_idx); 307 if (log_is_enabled(Debug, aot, heap)) { 308 oop old = root_segment(seg_idx)->obj_at(int_idx); 309 log_debug(aot, heap)("Clearing root %d: was " PTR_FORMAT, index, p2i(old)); 310 } 311 root_segment(seg_idx)->obj_at_put(int_idx, nullptr); 312 } 313 } 314 315 bool HeapShared::archive_object(oop obj, oop referrer, KlassSubGraphInfo* subgraph_info) { 316 assert(CDSConfig::is_dumping_heap(), "dump-time only"); 317 318 assert(!obj->is_stackChunk(), "do not archive stack chunks"); 319 if (has_been_archived(obj)) { 320 return true; 321 } 322 323 if (ArchiveHeapWriter::is_too_large_to_archive(obj->size())) { 324 log_debug(aot, heap)("Cannot archive, object (" PTR_FORMAT ") is too large: %zu", 325 p2i(obj), obj->size()); 326 debug_trace(); 327 return false; 328 } else { 329 AOTOopChecker::check(obj); // Make sure contents of this oop are safe. 330 331 count_allocation(obj->size()); 332 ArchiveHeapWriter::add_source_obj(obj); 333 CachedOopInfo info = make_cached_oop_info(obj, referrer); 334 335 OopHandle oh(Universe::vm_global(), obj); 336 archived_object_cache()->put_when_absent(oh, info); 337 archived_object_cache()->maybe_grow(); 338 mark_native_pointers(obj); 339 340 Klass* k = obj->klass(); 341 if (k->is_instance_klass()) { 342 // Whenever we see a non-array Java object of type X, we mark X to be aot-initialized. 343 // This ensures that during the production run, whenever Java code sees a cached object 344 // of type X, we know that X is already initialized. (see TODO comment below ...) 345 346 if (InstanceKlass::cast(k)->is_enum_subclass() 347 // We can't rerun <clinit> of enum classes (see cdsEnumKlass.cpp) so 348 // we must store them as AOT-initialized. 349 || (subgraph_info == _dump_time_special_subgraph)) 350 // TODO: we do this only for the special subgraph for now. Extending this to 351 // other subgraphs would require more refactoring of the core library (such as 352 // move some initialization logic into runtimeSetup()). 353 // 354 // For the other subgraphs, we have a weaker mechanism to ensure that 355 // all classes in a subgraph are initialized before the subgraph is programmatically 356 // returned from jdk.internal.misc.CDS::initializeFromArchive(). 357 // See HeapShared::initialize_from_archived_subgraph(). 358 { 359 AOTArtifactFinder::add_aot_inited_class(InstanceKlass::cast(k)); 360 } 361 362 if (java_lang_Class::is_instance(obj)) { 363 Klass* mirror_k = java_lang_Class::as_Klass(obj); 364 if (mirror_k != nullptr) { 365 AOTArtifactFinder::add_cached_class(mirror_k); 366 } 367 } else if (java_lang_invoke_ResolvedMethodName::is_instance(obj)) { 368 Method* m = java_lang_invoke_ResolvedMethodName::vmtarget(obj); 369 if (m != nullptr) { 370 if (RegeneratedClasses::has_been_regenerated(m)) { 371 m = RegeneratedClasses::get_regenerated_object(m); 372 } 373 InstanceKlass* method_holder = m->method_holder(); 374 AOTArtifactFinder::add_cached_class(method_holder); 375 } 376 } 377 } 378 379 if (log_is_enabled(Debug, aot, heap)) { 380 ResourceMark rm; 381 LogTarget(Debug, aot, heap) log; 382 LogStream out(log); 383 out.print("Archived heap object " PTR_FORMAT " : %s ", 384 p2i(obj), obj->klass()->external_name()); 385 if (java_lang_Class::is_instance(obj)) { 386 Klass* k = java_lang_Class::as_Klass(obj); 387 if (k != nullptr) { 388 out.print("%s", k->external_name()); 389 } else { 390 out.print("primitive"); 391 } 392 } 393 out.cr(); 394 } 395 396 return true; 397 } 398 } 399 400 class MetaspaceObjToOopHandleTable: public HashTable<MetaspaceObj*, OopHandle, 401 36137, // prime number 402 AnyObj::C_HEAP, 403 mtClassShared> { 404 public: 405 oop get_oop(MetaspaceObj* ptr) { 406 MutexLocker ml(ScratchObjects_lock, Mutex::_no_safepoint_check_flag); 407 OopHandle* handle = get(ptr); 408 if (handle != nullptr) { 409 return handle->resolve(); 410 } else { 411 return nullptr; 412 } 413 } 414 void set_oop(MetaspaceObj* ptr, oop o) { 415 MutexLocker ml(ScratchObjects_lock, Mutex::_no_safepoint_check_flag); 416 OopHandle handle(Universe::vm_global(), o); 417 bool is_new = put(ptr, handle); 418 assert(is_new, "cannot set twice"); 419 } 420 void remove_oop(MetaspaceObj* ptr) { 421 MutexLocker ml(ScratchObjects_lock, Mutex::_no_safepoint_check_flag); 422 OopHandle* handle = get(ptr); 423 if (handle != nullptr) { 424 handle->release(Universe::vm_global()); 425 remove(ptr); 426 } 427 } 428 }; 429 430 void HeapShared::add_scratch_resolved_references(ConstantPool* src, objArrayOop dest) { 431 if (SystemDictionaryShared::is_builtin_loader(src->pool_holder()->class_loader_data())) { 432 _scratch_objects_table->set_oop(src, dest); 433 } 434 } 435 436 objArrayOop HeapShared::scratch_resolved_references(ConstantPool* src) { 437 return (objArrayOop)_scratch_objects_table->get_oop(src); 438 } 439 440 void HeapShared::init_dumping() { 441 _scratch_objects_table = new (mtClass)MetaspaceObjToOopHandleTable(); 442 _pending_roots = new GrowableArrayCHeap<oop, mtClassShared>(500); 443 } 444 445 void HeapShared::init_scratch_objects_for_basic_type_mirrors(TRAPS) { 446 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 447 BasicType bt = (BasicType)i; 448 if (!is_reference_type(bt)) { 449 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK); 450 _scratch_basic_type_mirrors[i] = OopHandle(Universe::vm_global(), m); 451 } 452 } 453 } 454 455 // Given java_mirror that represents a (primitive or reference) type T, 456 // return the "scratch" version that represents the same type T. 457 // Note that if java_mirror will be returned if it's already a 458 // scratch mirror. 459 // 460 // See java_lang_Class::create_scratch_mirror() for more info. 461 oop HeapShared::scratch_java_mirror(oop java_mirror) { 462 assert(java_lang_Class::is_instance(java_mirror), "must be"); 463 464 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 465 BasicType bt = (BasicType)i; 466 if (!is_reference_type(bt)) { 467 if (_scratch_basic_type_mirrors[i].resolve() == java_mirror) { 468 return java_mirror; 469 } 470 } 471 } 472 473 if (java_lang_Class::is_primitive(java_mirror)) { 474 return scratch_java_mirror(java_lang_Class::as_BasicType(java_mirror)); 475 } else { 476 return scratch_java_mirror(java_lang_Class::as_Klass(java_mirror)); 477 } 478 } 479 480 oop HeapShared::scratch_java_mirror(BasicType t) { 481 assert((uint)t < T_VOID+1, "range check"); 482 assert(!is_reference_type(t), "sanity"); 483 return _scratch_basic_type_mirrors[t].resolve(); 484 } 485 486 oop HeapShared::scratch_java_mirror(Klass* k) { 487 return _scratch_objects_table->get_oop(k); 488 } 489 490 void HeapShared::set_scratch_java_mirror(Klass* k, oop mirror) { 491 _scratch_objects_table->set_oop(k, mirror); 492 } 493 494 void HeapShared::remove_scratch_objects(Klass* k) { 495 // Klass is being deallocated. Java mirror can still be alive, and it should not 496 // point to dead klass. We need to break the link from mirror to the Klass. 497 // See how InstanceKlass::deallocate_contents does it for normal mirrors. 498 oop mirror = _scratch_objects_table->get_oop(k); 499 if (mirror != nullptr) { 500 java_lang_Class::set_klass(mirror, nullptr); 501 } 502 _scratch_objects_table->remove_oop(k); 503 if (k->is_instance_klass()) { 504 _scratch_objects_table->remove(InstanceKlass::cast(k)->constants()); 505 } 506 } 507 508 //TODO: we eventually want a more direct test for these kinds of things. 509 //For example the JVM could record some bit of context from the creation 510 //of the klass, such as who called the hidden class factory. Using 511 //string compares on names is fragile and will break as soon as somebody 512 //changes the names in the JDK code. See discussion in JDK-8342481 for 513 //related ideas about marking AOT-related classes. 514 bool HeapShared::is_lambda_form_klass(InstanceKlass* ik) { 515 return ik->is_hidden() && 516 (ik->name()->starts_with("java/lang/invoke/LambdaForm$MH+") || 517 ik->name()->starts_with("java/lang/invoke/LambdaForm$DMH+") || 518 ik->name()->starts_with("java/lang/invoke/LambdaForm$BMH+") || 519 ik->name()->starts_with("java/lang/invoke/LambdaForm$VH+")); 520 } 521 522 bool HeapShared::is_lambda_proxy_klass(InstanceKlass* ik) { 523 return ik->is_hidden() && (ik->name()->index_of_at(0, "$$Lambda+", 9) > 0); 524 } 525 526 bool HeapShared::is_string_concat_klass(InstanceKlass* ik) { 527 return ik->is_hidden() && ik->name()->starts_with("java/lang/String$$StringConcat"); 528 } 529 530 bool HeapShared::is_archivable_hidden_klass(InstanceKlass* ik) { 531 return CDSConfig::is_dumping_method_handles() && 532 (is_lambda_form_klass(ik) || is_lambda_proxy_klass(ik) || is_string_concat_klass(ik)); 533 } 534 535 536 void HeapShared::copy_and_rescan_aot_inited_mirror(InstanceKlass* ik) { 537 ik->set_has_aot_initialized_mirror(); 538 539 oop orig_mirror; 540 if (RegeneratedClasses::is_regenerated_object(ik)) { 541 InstanceKlass* orig_ik = RegeneratedClasses::get_original_object(ik); 542 precond(orig_ik->is_initialized()); 543 orig_mirror = orig_ik->java_mirror(); 544 } else { 545 precond(ik->is_initialized()); 546 orig_mirror = ik->java_mirror(); 547 } 548 549 oop m = scratch_java_mirror(ik); 550 int nfields = 0; 551 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) { 552 if (fs.access_flags().is_static()) { 553 fieldDescriptor& fd = fs.field_descriptor(); 554 int offset = fd.offset(); 555 switch (fd.field_type()) { 556 case T_OBJECT: 557 case T_ARRAY: 558 { 559 oop field_obj = orig_mirror->obj_field(offset); 560 if (offset == java_lang_Class::reflection_data_offset()) { 561 // Class::reflectData use SoftReference, which cannot be archived. Set it 562 // to null and it will be recreated at runtime. 563 field_obj = nullptr; 564 } 565 m->obj_field_put(offset, field_obj); 566 if (field_obj != nullptr) { 567 bool success = archive_reachable_objects_from(1, _dump_time_special_subgraph, field_obj); 568 assert(success, "sanity"); 569 } 570 } 571 break; 572 case T_BOOLEAN: 573 m->bool_field_put(offset, orig_mirror->bool_field(offset)); 574 break; 575 case T_BYTE: 576 m->byte_field_put(offset, orig_mirror->byte_field(offset)); 577 break; 578 case T_SHORT: 579 m->short_field_put(offset, orig_mirror->short_field(offset)); 580 break; 581 case T_CHAR: 582 m->char_field_put(offset, orig_mirror->char_field(offset)); 583 break; 584 case T_INT: 585 m->int_field_put(offset, orig_mirror->int_field(offset)); 586 break; 587 case T_LONG: 588 m->long_field_put(offset, orig_mirror->long_field(offset)); 589 break; 590 case T_FLOAT: 591 m->float_field_put(offset, orig_mirror->float_field(offset)); 592 break; 593 case T_DOUBLE: 594 m->double_field_put(offset, orig_mirror->double_field(offset)); 595 break; 596 default: 597 ShouldNotReachHere(); 598 } 599 nfields ++; 600 } 601 } 602 603 oop class_data = java_lang_Class::class_data(orig_mirror); 604 java_lang_Class::set_class_data(m, class_data); 605 if (class_data != nullptr) { 606 bool success = archive_reachable_objects_from(1, _dump_time_special_subgraph, class_data); 607 assert(success, "sanity"); 608 } 609 610 if (log_is_enabled(Debug, aot, init)) { 611 ResourceMark rm; 612 log_debug(aot, init)("copied %3d field(s) in aot-initialized mirror %s%s%s", nfields, ik->external_name(), 613 ik->is_hidden() ? " (hidden)" : "", 614 ik->is_enum_subclass() ? " (enum)" : ""); 615 } 616 } 617 618 void HeapShared::copy_java_mirror(oop orig_mirror, oop scratch_m) { 619 // We need to retain the identity_hash, because it may have been used by some hashtables 620 // in the shared heap. 621 if (!orig_mirror->fast_no_hash_check()) { 622 intptr_t src_hash = orig_mirror->identity_hash(); 623 if (UseCompactObjectHeaders) { 624 narrowKlass nk = CompressedKlassPointers::encode(orig_mirror->klass()); 625 scratch_m->set_mark(markWord::prototype().set_narrow_klass(nk).copy_set_hash(src_hash)); 626 } else { 627 scratch_m->set_mark(markWord::prototype().copy_set_hash(src_hash)); 628 } 629 assert(scratch_m->mark().is_unlocked(), "sanity"); 630 631 DEBUG_ONLY(intptr_t archived_hash = scratch_m->identity_hash()); 632 assert(src_hash == archived_hash, "Different hash codes: original " INTPTR_FORMAT ", archived " INTPTR_FORMAT, src_hash, archived_hash); 633 } 634 635 if (CDSConfig::is_dumping_aot_linked_classes()) { 636 java_lang_Class::set_module(scratch_m, java_lang_Class::module(orig_mirror)); 637 java_lang_Class::set_protection_domain(scratch_m, java_lang_Class::protection_domain(orig_mirror)); 638 } 639 } 640 641 static objArrayOop get_archived_resolved_references(InstanceKlass* src_ik) { 642 if (SystemDictionaryShared::is_builtin_loader(src_ik->class_loader_data())) { 643 objArrayOop rr = src_ik->constants()->resolved_references_or_null(); 644 if (rr != nullptr && !ArchiveHeapWriter::is_too_large_to_archive(rr)) { 645 return HeapShared::scratch_resolved_references(src_ik->constants()); 646 } 647 } 648 return nullptr; 649 } 650 651 void HeapShared::archive_strings() { 652 oop shared_strings_array = StringTable::init_shared_strings_array(); 653 bool success = archive_reachable_objects_from(1, _dump_time_special_subgraph, shared_strings_array); 654 assert(success, "shared strings array must not point to arrays or strings that are too large to archive"); 655 StringTable::set_shared_strings_array_index(append_root(shared_strings_array)); 656 } 657 658 int HeapShared::archive_exception_instance(oop exception) { 659 bool success = archive_reachable_objects_from(1, _dump_time_special_subgraph, exception); 660 assert(success, "sanity"); 661 return append_root(exception); 662 } 663 664 void HeapShared::mark_native_pointers(oop orig_obj) { 665 if (java_lang_Class::is_instance(orig_obj)) { 666 ArchiveHeapWriter::mark_native_pointer(orig_obj, java_lang_Class::klass_offset()); 667 ArchiveHeapWriter::mark_native_pointer(orig_obj, java_lang_Class::array_klass_offset()); 668 } else if (java_lang_invoke_ResolvedMethodName::is_instance(orig_obj)) { 669 ArchiveHeapWriter::mark_native_pointer(orig_obj, java_lang_invoke_ResolvedMethodName::vmtarget_offset()); 670 } 671 } 672 673 void HeapShared::get_pointer_info(oop src_obj, bool& has_oop_pointers, bool& has_native_pointers) { 674 OopHandle oh(&src_obj); 675 CachedOopInfo* info = archived_object_cache()->get(oh); 676 assert(info != nullptr, "must be"); 677 has_oop_pointers = info->has_oop_pointers(); 678 has_native_pointers = info->has_native_pointers(); 679 } 680 681 void HeapShared::set_has_native_pointers(oop src_obj) { 682 OopHandle oh(&src_obj); 683 CachedOopInfo* info = archived_object_cache()->get(oh); 684 assert(info != nullptr, "must be"); 685 info->set_has_native_pointers(); 686 } 687 688 // Between start_scanning_for_oops() and end_scanning_for_oops(), we discover all Java heap objects that 689 // should be stored in the AOT cache. The scanning is coordinated by AOTArtifactFinder. 690 void HeapShared::start_scanning_for_oops() { 691 { 692 NoSafepointVerifier nsv; 693 694 // The special subgraph doesn't belong to any class. We use Object_klass() here just 695 // for convenience. 696 _dump_time_special_subgraph = init_subgraph_info(vmClasses::Object_klass(), false); 697 698 // Cache for recording where the archived objects are copied to 699 create_archived_object_cache(); 700 701 if (UseCompressedOops || UseG1GC) { 702 aot_log_info(aot)("Heap range = [" PTR_FORMAT " - " PTR_FORMAT "]", 703 UseCompressedOops ? p2i(CompressedOops::begin()) : 704 p2i((address)G1CollectedHeap::heap()->reserved().start()), 705 UseCompressedOops ? p2i(CompressedOops::end()) : 706 p2i((address)G1CollectedHeap::heap()->reserved().end())); 707 } 708 709 archive_subgraphs(); 710 } 711 712 init_seen_objects_table(); 713 Universe::archive_exception_instances(); 714 } 715 716 void HeapShared::end_scanning_for_oops() { 717 archive_strings(); 718 delete_seen_objects_table(); 719 } 720 721 void HeapShared::write_heap(ArchiveHeapInfo *heap_info) { 722 { 723 NoSafepointVerifier nsv; 724 CDSHeapVerifier::verify(); 725 check_special_subgraph_classes(); 726 } 727 728 StringTable::write_shared_table(); 729 ArchiveHeapWriter::write(_pending_roots, heap_info); 730 731 ArchiveBuilder::OtherROAllocMark mark; 732 write_subgraph_info_table(); 733 } 734 735 void HeapShared::scan_java_mirror(oop orig_mirror) { 736 oop m = scratch_java_mirror(orig_mirror); 737 if (m != nullptr) { // nullptr if for custom class loader 738 copy_java_mirror(orig_mirror, m); 739 bool success = archive_reachable_objects_from(1, _dump_time_special_subgraph, m); 740 assert(success, "sanity"); 741 } 742 } 743 744 void HeapShared::scan_java_class(Klass* orig_k) { 745 scan_java_mirror(orig_k->java_mirror()); 746 747 if (orig_k->is_instance_klass()) { 748 InstanceKlass* orig_ik = InstanceKlass::cast(orig_k); 749 orig_ik->constants()->prepare_resolved_references_for_archiving(); 750 objArrayOop rr = get_archived_resolved_references(orig_ik); 751 if (rr != nullptr) { 752 bool success = HeapShared::archive_reachable_objects_from(1, _dump_time_special_subgraph, rr); 753 assert(success, "must be"); 754 } 755 } 756 } 757 758 void HeapShared::archive_subgraphs() { 759 assert(CDSConfig::is_dumping_heap(), "must be"); 760 761 archive_object_subgraphs(archive_subgraph_entry_fields, 762 false /* is_full_module_graph */); 763 764 if (CDSConfig::is_dumping_full_module_graph()) { 765 archive_object_subgraphs(fmg_archive_subgraph_entry_fields, 766 true /* is_full_module_graph */); 767 Modules::verify_archived_modules(); 768 } 769 } 770 771 // 772 // Subgraph archiving support 773 // 774 HeapShared::DumpTimeKlassSubGraphInfoTable* HeapShared::_dump_time_subgraph_info_table = nullptr; 775 HeapShared::RunTimeKlassSubGraphInfoTable HeapShared::_run_time_subgraph_info_table; 776 777 // Get the subgraph_info for Klass k. A new subgraph_info is created if 778 // there is no existing one for k. The subgraph_info records the "buffered" 779 // address of the class. 780 KlassSubGraphInfo* HeapShared::init_subgraph_info(Klass* k, bool is_full_module_graph) { 781 assert(CDSConfig::is_dumping_heap(), "dump time only"); 782 bool created; 783 KlassSubGraphInfo* info = 784 _dump_time_subgraph_info_table->put_if_absent(k, KlassSubGraphInfo(k, is_full_module_graph), 785 &created); 786 assert(created, "must not initialize twice"); 787 return info; 788 } 789 790 KlassSubGraphInfo* HeapShared::get_subgraph_info(Klass* k) { 791 assert(CDSConfig::is_dumping_heap(), "dump time only"); 792 KlassSubGraphInfo* info = _dump_time_subgraph_info_table->get(k); 793 assert(info != nullptr, "must have been initialized"); 794 return info; 795 } 796 797 // Add an entry field to the current KlassSubGraphInfo. 798 void KlassSubGraphInfo::add_subgraph_entry_field(int static_field_offset, oop v) { 799 assert(CDSConfig::is_dumping_heap(), "dump time only"); 800 if (_subgraph_entry_fields == nullptr) { 801 _subgraph_entry_fields = 802 new (mtClass) GrowableArray<int>(10, mtClass); 803 } 804 _subgraph_entry_fields->append(static_field_offset); 805 _subgraph_entry_fields->append(HeapShared::append_root(v)); 806 } 807 808 // Add the Klass* for an object in the current KlassSubGraphInfo's subgraphs. 809 // Only objects of boot classes can be included in sub-graph. 810 void KlassSubGraphInfo::add_subgraph_object_klass(Klass* orig_k) { 811 assert(CDSConfig::is_dumping_heap(), "dump time only"); 812 813 if (_subgraph_object_klasses == nullptr) { 814 _subgraph_object_klasses = 815 new (mtClass) GrowableArray<Klass*>(50, mtClass); 816 } 817 818 if (_k == orig_k) { 819 // Don't add the Klass containing the sub-graph to it's own klass 820 // initialization list. 821 return; 822 } 823 824 if (orig_k->is_instance_klass()) { 825 #ifdef ASSERT 826 InstanceKlass* ik = InstanceKlass::cast(orig_k); 827 if (CDSConfig::is_dumping_method_handles()) { 828 // -XX:AOTInitTestClass must be used carefully in regression tests to 829 // include only classes that are safe to aot-initialize. 830 assert(ik->class_loader() == nullptr || 831 HeapShared::is_lambda_proxy_klass(ik) || 832 AOTClassInitializer::has_test_class(), 833 "we can archive only instances of boot classes or lambda proxy classes"); 834 } else { 835 assert(ik->class_loader() == nullptr, "must be boot class"); 836 } 837 #endif 838 // vmClasses::xxx_klass() are not updated, need to check 839 // the original Klass* 840 if (orig_k == vmClasses::String_klass() || 841 orig_k == vmClasses::Object_klass()) { 842 // Initialized early during VM initialization. No need to be added 843 // to the sub-graph object class list. 844 return; 845 } 846 check_allowed_klass(InstanceKlass::cast(orig_k)); 847 } else if (orig_k->is_objArray_klass()) { 848 Klass* abk = ObjArrayKlass::cast(orig_k)->bottom_klass(); 849 if (abk->is_instance_klass()) { 850 assert(InstanceKlass::cast(abk)->defined_by_boot_loader(), 851 "must be boot class"); 852 check_allowed_klass(InstanceKlass::cast(ObjArrayKlass::cast(orig_k)->bottom_klass())); 853 } 854 if (orig_k == Universe::objectArrayKlass()) { 855 // Initialized early during Universe::genesis. No need to be added 856 // to the list. 857 return; 858 } 859 } else { 860 assert(orig_k->is_typeArray_klass(), "must be"); 861 // Primitive type arrays are created early during Universe::genesis. 862 return; 863 } 864 865 if (log_is_enabled(Debug, aot, heap)) { 866 if (!_subgraph_object_klasses->contains(orig_k)) { 867 ResourceMark rm; 868 log_debug(aot, heap)("Adding klass %s", orig_k->external_name()); 869 } 870 } 871 872 _subgraph_object_klasses->append_if_missing(orig_k); 873 _has_non_early_klasses |= is_non_early_klass(orig_k); 874 } 875 876 void KlassSubGraphInfo::check_allowed_klass(InstanceKlass* ik) { 877 #ifndef PRODUCT 878 if (AOTClassInitializer::has_test_class()) { 879 // The tests can cache arbitrary types of objects. 880 return; 881 } 882 #endif 883 884 if (ik->module()->name() == vmSymbols::java_base()) { 885 assert(ik->package() != nullptr, "classes in java.base cannot be in unnamed package"); 886 return; 887 } 888 889 const char* lambda_msg = ""; 890 if (CDSConfig::is_dumping_method_handles()) { 891 lambda_msg = ", or a lambda proxy class"; 892 if (HeapShared::is_lambda_proxy_klass(ik) && 893 (ik->class_loader() == nullptr || 894 ik->class_loader() == SystemDictionary::java_platform_loader() || 895 ik->class_loader() == SystemDictionary::java_system_loader())) { 896 return; 897 } 898 } 899 900 #ifndef PRODUCT 901 if (!ik->module()->is_named() && ik->package() == nullptr && ArchiveHeapTestClass != nullptr) { 902 // This class is loaded by ArchiveHeapTestClass 903 return; 904 } 905 const char* testcls_msg = ", or a test class in an unnamed package of an unnamed module"; 906 #else 907 const char* testcls_msg = ""; 908 #endif 909 910 ResourceMark rm; 911 log_error(aot, heap)("Class %s not allowed in archive heap. Must be in java.base%s%s", 912 ik->external_name(), lambda_msg, testcls_msg); 913 AOTMetaspace::unrecoverable_writing_error(); 914 } 915 916 bool KlassSubGraphInfo::is_non_early_klass(Klass* k) { 917 if (k->is_objArray_klass()) { 918 k = ObjArrayKlass::cast(k)->bottom_klass(); 919 } 920 if (k->is_instance_klass()) { 921 if (!SystemDictionaryShared::is_early_klass(InstanceKlass::cast(k))) { 922 ResourceMark rm; 923 log_info(aot, heap)("non-early: %s", k->external_name()); 924 return true; 925 } else { 926 return false; 927 } 928 } else { 929 return false; 930 } 931 } 932 933 // Initialize an archived subgraph_info_record from the given KlassSubGraphInfo. 934 void ArchivedKlassSubGraphInfoRecord::init(KlassSubGraphInfo* info) { 935 _k = ArchiveBuilder::get_buffered_klass(info->klass()); 936 _entry_field_records = nullptr; 937 _subgraph_object_klasses = nullptr; 938 _is_full_module_graph = info->is_full_module_graph(); 939 940 if (_is_full_module_graph) { 941 // Consider all classes referenced by the full module graph as early -- we will be 942 // allocating objects of these classes during JVMTI early phase, so they cannot 943 // be processed by (non-early) JVMTI ClassFileLoadHook 944 _has_non_early_klasses = false; 945 } else { 946 _has_non_early_klasses = info->has_non_early_klasses(); 947 } 948 949 if (_has_non_early_klasses) { 950 ResourceMark rm; 951 log_info(aot, heap)( 952 "Subgraph of klass %s has non-early klasses and cannot be used when JVMTI ClassFileLoadHook is enabled", 953 _k->external_name()); 954 } 955 956 // populate the entry fields 957 GrowableArray<int>* entry_fields = info->subgraph_entry_fields(); 958 if (entry_fields != nullptr) { 959 int num_entry_fields = entry_fields->length(); 960 assert(num_entry_fields % 2 == 0, "sanity"); 961 _entry_field_records = 962 ArchiveBuilder::new_ro_array<int>(num_entry_fields); 963 for (int i = 0 ; i < num_entry_fields; i++) { 964 _entry_field_records->at_put(i, entry_fields->at(i)); 965 } 966 } 967 968 // <recorded_klasses> has the Klasses of all the objects that are referenced by this subgraph. 969 // Copy those that need to be explicitly initialized into <_subgraph_object_klasses>. 970 GrowableArray<Klass*>* recorded_klasses = info->subgraph_object_klasses(); 971 if (recorded_klasses != nullptr) { 972 // AOT-inited classes are automatically marked as "initialized" during bootstrap. When 973 // programmatically loading a subgraph, we only need to explicitly initialize the classes 974 // that are not aot-inited. 975 int num_to_copy = 0; 976 for (int i = 0; i < recorded_klasses->length(); i++) { 977 Klass* subgraph_k = ArchiveBuilder::get_buffered_klass(recorded_klasses->at(i)); 978 if (!subgraph_k->has_aot_initialized_mirror()) { 979 num_to_copy ++; 980 } 981 } 982 983 _subgraph_object_klasses = ArchiveBuilder::new_ro_array<Klass*>(num_to_copy); 984 bool is_special = (_k == ArchiveBuilder::get_buffered_klass(vmClasses::Object_klass())); 985 for (int i = 0, n = 0; i < recorded_klasses->length(); i++) { 986 Klass* subgraph_k = ArchiveBuilder::get_buffered_klass(recorded_klasses->at(i)); 987 if (subgraph_k->has_aot_initialized_mirror()) { 988 continue; 989 } 990 if (log_is_enabled(Info, aot, heap)) { 991 ResourceMark rm; 992 const char* owner_name = is_special ? "<special>" : _k->external_name(); 993 if (subgraph_k->is_instance_klass()) { 994 InstanceKlass* src_ik = InstanceKlass::cast(ArchiveBuilder::current()->get_source_addr(subgraph_k)); 995 } 996 log_info(aot, heap)( 997 "Archived object klass %s (%2d) => %s", 998 owner_name, n, subgraph_k->external_name()); 999 } 1000 _subgraph_object_klasses->at_put(n, subgraph_k); 1001 ArchivePtrMarker::mark_pointer(_subgraph_object_klasses->adr_at(n)); 1002 n++; 1003 } 1004 } 1005 1006 ArchivePtrMarker::mark_pointer(&_k); 1007 ArchivePtrMarker::mark_pointer(&_entry_field_records); 1008 ArchivePtrMarker::mark_pointer(&_subgraph_object_klasses); 1009 } 1010 1011 class HeapShared::CopyKlassSubGraphInfoToArchive : StackObj { 1012 CompactHashtableWriter* _writer; 1013 public: 1014 CopyKlassSubGraphInfoToArchive(CompactHashtableWriter* writer) : _writer(writer) {} 1015 1016 bool do_entry(Klass* klass, KlassSubGraphInfo& info) { 1017 if (info.subgraph_object_klasses() != nullptr || info.subgraph_entry_fields() != nullptr) { 1018 ArchivedKlassSubGraphInfoRecord* record = HeapShared::archive_subgraph_info(&info); 1019 Klass* buffered_k = ArchiveBuilder::get_buffered_klass(klass); 1020 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary((address)buffered_k); 1021 u4 delta = ArchiveBuilder::current()->any_to_offset_u4(record); 1022 _writer->add(hash, delta); 1023 } 1024 return true; // keep on iterating 1025 } 1026 }; 1027 1028 ArchivedKlassSubGraphInfoRecord* HeapShared::archive_subgraph_info(KlassSubGraphInfo* info) { 1029 ArchivedKlassSubGraphInfoRecord* record = 1030 (ArchivedKlassSubGraphInfoRecord*)ArchiveBuilder::ro_region_alloc(sizeof(ArchivedKlassSubGraphInfoRecord)); 1031 record->init(info); 1032 if (info == _dump_time_special_subgraph) { 1033 _run_time_special_subgraph = record; 1034 } 1035 return record; 1036 } 1037 1038 // Build the records of archived subgraph infos, which include: 1039 // - Entry points to all subgraphs from the containing class mirror. The entry 1040 // points are static fields in the mirror. For each entry point, the field 1041 // offset, and value are recorded in the sub-graph 1042 // info. The value is stored back to the corresponding field at runtime. 1043 // - A list of klasses that need to be loaded/initialized before archived 1044 // java object sub-graph can be accessed at runtime. 1045 void HeapShared::write_subgraph_info_table() { 1046 // Allocate the contents of the hashtable(s) inside the RO region of the CDS archive. 1047 DumpTimeKlassSubGraphInfoTable* d_table = _dump_time_subgraph_info_table; 1048 CompactHashtableStats stats; 1049 1050 _run_time_subgraph_info_table.reset(); 1051 1052 CompactHashtableWriter writer(d_table->_count, &stats); 1053 CopyKlassSubGraphInfoToArchive copy(&writer); 1054 d_table->iterate(©); 1055 writer.dump(&_run_time_subgraph_info_table, "subgraphs"); 1056 1057 #ifndef PRODUCT 1058 if (ArchiveHeapTestClass != nullptr) { 1059 size_t len = strlen(ArchiveHeapTestClass) + 1; 1060 Array<char>* array = ArchiveBuilder::new_ro_array<char>((int)len); 1061 strncpy(array->adr_at(0), ArchiveHeapTestClass, len); 1062 _archived_ArchiveHeapTestClass = array; 1063 } 1064 #endif 1065 if (log_is_enabled(Info, aot, heap)) { 1066 print_stats(); 1067 } 1068 } 1069 1070 void HeapShared::add_root_segment(objArrayOop segment_oop) { 1071 assert(segment_oop != nullptr, "must be"); 1072 assert(ArchiveHeapLoader::is_in_use(), "must be"); 1073 if (_root_segments == nullptr) { 1074 _root_segments = new GrowableArrayCHeap<OopHandle, mtClassShared>(10); 1075 } 1076 _root_segments->push(OopHandle(Universe::vm_global(), segment_oop)); 1077 } 1078 1079 void HeapShared::init_root_segment_sizes(int max_size_elems) { 1080 _root_segment_max_size_elems = max_size_elems; 1081 } 1082 1083 void HeapShared::serialize_tables(SerializeClosure* soc) { 1084 1085 #ifndef PRODUCT 1086 soc->do_ptr(&_archived_ArchiveHeapTestClass); 1087 if (soc->reading() && _archived_ArchiveHeapTestClass != nullptr) { 1088 _test_class_name = _archived_ArchiveHeapTestClass->adr_at(0); 1089 setup_test_class(_test_class_name); 1090 } 1091 #endif 1092 1093 _run_time_subgraph_info_table.serialize_header(soc); 1094 soc->do_ptr(&_run_time_special_subgraph); 1095 } 1096 1097 static void verify_the_heap(Klass* k, const char* which) { 1098 if (VerifyArchivedFields > 0) { 1099 ResourceMark rm; 1100 log_info(aot, heap)("Verify heap %s initializing static field(s) in %s", 1101 which, k->external_name()); 1102 1103 VM_Verify verify_op; 1104 VMThread::execute(&verify_op); 1105 1106 if (VerifyArchivedFields > 1 && is_init_completed()) { 1107 // At this time, the oop->klass() of some archived objects in the heap may not 1108 // have been loaded into the system dictionary yet. Nevertheless, oop->klass() should 1109 // have enough information (object size, oop maps, etc) so that a GC can be safely 1110 // performed. 1111 // 1112 // -XX:VerifyArchivedFields=2 force a GC to happen in such an early stage 1113 // to check for GC safety. 1114 log_info(aot, heap)("Trigger GC %s initializing static field(s) in %s", 1115 which, k->external_name()); 1116 FlagSetting fs1(VerifyBeforeGC, true); 1117 FlagSetting fs2(VerifyDuringGC, true); 1118 FlagSetting fs3(VerifyAfterGC, true); 1119 Universe::heap()->collect(GCCause::_java_lang_system_gc); 1120 } 1121 } 1122 } 1123 1124 // Before GC can execute, we must ensure that all oops reachable from HeapShared::roots() 1125 // have a valid klass. I.e., oopDesc::klass() must have already been resolved. 1126 // 1127 // Note: if a ArchivedKlassSubGraphInfoRecord contains non-early classes, and JVMTI 1128 // ClassFileLoadHook is enabled, it's possible for this class to be dynamically replaced. In 1129 // this case, we will not load the ArchivedKlassSubGraphInfoRecord and will clear its roots. 1130 void HeapShared::resolve_classes(JavaThread* current) { 1131 assert(CDSConfig::is_using_archive(), "runtime only!"); 1132 if (!ArchiveHeapLoader::is_in_use()) { 1133 return; // nothing to do 1134 } 1135 resolve_classes_for_subgraphs(current, archive_subgraph_entry_fields); 1136 resolve_classes_for_subgraphs(current, fmg_archive_subgraph_entry_fields); 1137 } 1138 1139 void HeapShared::resolve_classes_for_subgraphs(JavaThread* current, ArchivableStaticFieldInfo fields[]) { 1140 for (int i = 0; fields[i].valid(); i++) { 1141 ArchivableStaticFieldInfo* info = &fields[i]; 1142 TempNewSymbol klass_name = SymbolTable::new_symbol(info->klass_name); 1143 InstanceKlass* k = SystemDictionaryShared::find_builtin_class(klass_name); 1144 assert(k != nullptr && k->defined_by_boot_loader(), "sanity"); 1145 resolve_classes_for_subgraph_of(current, k); 1146 } 1147 } 1148 1149 void HeapShared::resolve_classes_for_subgraph_of(JavaThread* current, Klass* k) { 1150 JavaThread* THREAD = current; 1151 ExceptionMark em(THREAD); 1152 const ArchivedKlassSubGraphInfoRecord* record = 1153 resolve_or_init_classes_for_subgraph_of(k, /*do_init=*/false, THREAD); 1154 if (HAS_PENDING_EXCEPTION) { 1155 CLEAR_PENDING_EXCEPTION; 1156 } 1157 if (record == nullptr) { 1158 clear_archived_roots_of(k); 1159 } 1160 } 1161 1162 void HeapShared::initialize_java_lang_invoke(TRAPS) { 1163 if (CDSConfig::is_using_aot_linked_classes() || CDSConfig::is_dumping_method_handles()) { 1164 resolve_or_init("java/lang/invoke/Invokers$Holder", true, CHECK); 1165 resolve_or_init("java/lang/invoke/MethodHandle", true, CHECK); 1166 resolve_or_init("java/lang/invoke/MethodHandleNatives", true, CHECK); 1167 resolve_or_init("java/lang/invoke/DirectMethodHandle$Holder", true, CHECK); 1168 resolve_or_init("java/lang/invoke/DelegatingMethodHandle$Holder", true, CHECK); 1169 resolve_or_init("java/lang/invoke/LambdaForm$Holder", true, CHECK); 1170 resolve_or_init("java/lang/invoke/BoundMethodHandle$Species_L", true, CHECK); 1171 } 1172 } 1173 1174 // Initialize the InstanceKlasses of objects that are reachable from the following roots: 1175 // - interned strings 1176 // - Klass::java_mirror() -- including aot-initialized mirrors such as those of Enum klasses. 1177 // - ConstantPool::resolved_references() 1178 // - Universe::<xxx>_exception_instance() 1179 // 1180 // For example, if this enum class is initialized at AOT cache assembly time: 1181 // 1182 // enum Fruit { 1183 // APPLE, ORANGE, BANANA; 1184 // static final Set<Fruit> HAVE_SEEDS = new HashSet<>(Arrays.asList(APPLE, ORANGE)); 1185 // } 1186 // 1187 // the aot-initialized mirror of Fruit has a static field that references HashSet, which 1188 // should be initialized before any Java code can access the Fruit class. Note that 1189 // HashSet itself doesn't necessary need to be an aot-initialized class. 1190 void HeapShared::init_classes_for_special_subgraph(Handle class_loader, TRAPS) { 1191 if (!ArchiveHeapLoader::is_in_use()) { 1192 return; 1193 } 1194 1195 assert( _run_time_special_subgraph != nullptr, "must be"); 1196 Array<Klass*>* klasses = _run_time_special_subgraph->subgraph_object_klasses(); 1197 if (klasses != nullptr) { 1198 for (int pass = 0; pass < 2; pass ++) { 1199 for (int i = 0; i < klasses->length(); i++) { 1200 Klass* k = klasses->at(i); 1201 if (k->class_loader_data() == nullptr) { 1202 // This class is not yet loaded. We will initialize it in a later phase. 1203 // For example, we have loaded only AOTLinkedClassCategory::BOOT1 classes 1204 // but k is part of AOTLinkedClassCategory::BOOT2. 1205 continue; 1206 } 1207 if (k->class_loader() == class_loader()) { 1208 if (pass == 0) { 1209 if (k->is_instance_klass()) { 1210 InstanceKlass::cast(k)->link_class(CHECK); 1211 } 1212 } else { 1213 resolve_or_init(k, /*do_init*/true, CHECK); 1214 } 1215 } 1216 } 1217 } 1218 } 1219 } 1220 1221 void HeapShared::initialize_from_archived_subgraph(JavaThread* current, Klass* k) { 1222 JavaThread* THREAD = current; 1223 if (!ArchiveHeapLoader::is_in_use()) { 1224 return; // nothing to do 1225 } 1226 1227 if (k->name()->equals("jdk/internal/module/ArchivedModuleGraph") && 1228 !CDSConfig::is_using_optimized_module_handling() && 1229 // archive was created with --module-path 1230 AOTClassLocationConfig::runtime()->num_module_paths() > 0) { 1231 // ArchivedModuleGraph was created with a --module-path that's different than the runtime --module-path. 1232 // Thus, it might contain references to modules that do not exist at runtime. We cannot use it. 1233 log_info(aot, heap)("Skip initializing ArchivedModuleGraph subgraph: is_using_optimized_module_handling=%s num_module_paths=%d", 1234 BOOL_TO_STR(CDSConfig::is_using_optimized_module_handling()), 1235 AOTClassLocationConfig::runtime()->num_module_paths()); 1236 return; 1237 } 1238 1239 ExceptionMark em(THREAD); 1240 const ArchivedKlassSubGraphInfoRecord* record = 1241 resolve_or_init_classes_for_subgraph_of(k, /*do_init=*/true, THREAD); 1242 1243 if (HAS_PENDING_EXCEPTION) { 1244 CLEAR_PENDING_EXCEPTION; 1245 // None of the field value will be set if there was an exception when initializing the classes. 1246 // The java code will not see any of the archived objects in the 1247 // subgraphs referenced from k in this case. 1248 return; 1249 } 1250 1251 if (record != nullptr) { 1252 init_archived_fields_for(k, record); 1253 } 1254 } 1255 1256 const ArchivedKlassSubGraphInfoRecord* 1257 HeapShared::resolve_or_init_classes_for_subgraph_of(Klass* k, bool do_init, TRAPS) { 1258 assert(!CDSConfig::is_dumping_heap(), "Should not be called when dumping heap"); 1259 1260 if (!k->in_aot_cache()) { 1261 return nullptr; 1262 } 1263 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(k); 1264 const ArchivedKlassSubGraphInfoRecord* record = _run_time_subgraph_info_table.lookup(k, hash, 0); 1265 1266 #ifndef PRODUCT 1267 if (_test_class_name != nullptr && k->name()->equals(_test_class_name) && record != nullptr) { 1268 _test_class = k; 1269 _test_class_record = record; 1270 } 1271 #endif 1272 1273 // Initialize from archived data. Currently this is done only 1274 // during VM initialization time. No lock is needed. 1275 if (record == nullptr) { 1276 if (log_is_enabled(Info, aot, heap)) { 1277 ResourceMark rm(THREAD); 1278 log_info(aot, heap)("subgraph %s is not recorded", 1279 k->external_name()); 1280 } 1281 return nullptr; 1282 } else { 1283 if (record->is_full_module_graph() && !CDSConfig::is_using_full_module_graph()) { 1284 if (log_is_enabled(Info, aot, heap)) { 1285 ResourceMark rm(THREAD); 1286 log_info(aot, heap)("subgraph %s cannot be used because full module graph is disabled", 1287 k->external_name()); 1288 } 1289 return nullptr; 1290 } 1291 1292 if (record->has_non_early_klasses() && JvmtiExport::should_post_class_file_load_hook()) { 1293 if (log_is_enabled(Info, aot, heap)) { 1294 ResourceMark rm(THREAD); 1295 log_info(aot, heap)("subgraph %s cannot be used because JVMTI ClassFileLoadHook is enabled", 1296 k->external_name()); 1297 } 1298 return nullptr; 1299 } 1300 1301 if (log_is_enabled(Info, aot, heap)) { 1302 ResourceMark rm; 1303 log_info(aot, heap)("%s subgraph %s ", do_init ? "init" : "resolve", k->external_name()); 1304 } 1305 1306 resolve_or_init(k, do_init, CHECK_NULL); 1307 1308 // Load/link/initialize the klasses of the objects in the subgraph. 1309 // nullptr class loader is used. 1310 Array<Klass*>* klasses = record->subgraph_object_klasses(); 1311 if (klasses != nullptr) { 1312 for (int i = 0; i < klasses->length(); i++) { 1313 Klass* klass = klasses->at(i); 1314 if (!klass->in_aot_cache()) { 1315 return nullptr; 1316 } 1317 resolve_or_init(klass, do_init, CHECK_NULL); 1318 } 1319 } 1320 } 1321 1322 return record; 1323 } 1324 1325 void HeapShared::resolve_or_init(const char* klass_name, bool do_init, TRAPS) { 1326 TempNewSymbol klass_name_sym = SymbolTable::new_symbol(klass_name); 1327 InstanceKlass* k = SystemDictionaryShared::find_builtin_class(klass_name_sym); 1328 if (k == nullptr) { 1329 return; 1330 } 1331 assert(k->defined_by_boot_loader(), "sanity"); 1332 resolve_or_init(k, false, CHECK); 1333 if (do_init) { 1334 resolve_or_init(k, true, CHECK); 1335 } 1336 } 1337 1338 void HeapShared::resolve_or_init(Klass* k, bool do_init, TRAPS) { 1339 if (!do_init) { 1340 if (k->class_loader_data() == nullptr) { 1341 Klass* resolved_k = SystemDictionary::resolve_or_null(k->name(), CHECK); 1342 assert(resolved_k == k, "classes used by archived heap must not be replaced by JVMTI ClassFileLoadHook"); 1343 } 1344 } else { 1345 assert(k->class_loader_data() != nullptr, "must have been resolved by HeapShared::resolve_classes"); 1346 if (k->is_instance_klass()) { 1347 InstanceKlass* ik = InstanceKlass::cast(k); 1348 ik->initialize(CHECK); 1349 } else if (k->is_objArray_klass()) { 1350 ObjArrayKlass* oak = ObjArrayKlass::cast(k); 1351 oak->initialize(CHECK); 1352 } 1353 } 1354 } 1355 1356 void HeapShared::init_archived_fields_for(Klass* k, const ArchivedKlassSubGraphInfoRecord* record) { 1357 verify_the_heap(k, "before"); 1358 1359 // Load the subgraph entry fields from the record and store them back to 1360 // the corresponding fields within the mirror. 1361 oop m = k->java_mirror(); 1362 Array<int>* entry_field_records = record->entry_field_records(); 1363 if (entry_field_records != nullptr) { 1364 int efr_len = entry_field_records->length(); 1365 assert(efr_len % 2 == 0, "sanity"); 1366 for (int i = 0; i < efr_len; i += 2) { 1367 int field_offset = entry_field_records->at(i); 1368 int root_index = entry_field_records->at(i+1); 1369 oop v = get_root(root_index, /*clear=*/true); 1370 if (k->has_aot_initialized_mirror()) { 1371 assert(v == m->obj_field(field_offset), "must be aot-initialized"); 1372 } else { 1373 m->obj_field_put(field_offset, v); 1374 } 1375 log_debug(aot, heap)(" " PTR_FORMAT " init field @ %2d = " PTR_FORMAT, p2i(k), field_offset, p2i(v)); 1376 } 1377 1378 // Done. Java code can see the archived sub-graphs referenced from k's 1379 // mirror after this point. 1380 if (log_is_enabled(Info, aot, heap)) { 1381 ResourceMark rm; 1382 log_info(aot, heap)("initialize_from_archived_subgraph %s " PTR_FORMAT "%s%s", 1383 k->external_name(), p2i(k), JvmtiExport::is_early_phase() ? " (early)" : "", 1384 k->has_aot_initialized_mirror() ? " (aot-inited)" : ""); 1385 } 1386 } 1387 1388 verify_the_heap(k, "after "); 1389 } 1390 1391 void HeapShared::clear_archived_roots_of(Klass* k) { 1392 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(k); 1393 const ArchivedKlassSubGraphInfoRecord* record = _run_time_subgraph_info_table.lookup(k, hash, 0); 1394 if (record != nullptr) { 1395 Array<int>* entry_field_records = record->entry_field_records(); 1396 if (entry_field_records != nullptr) { 1397 int efr_len = entry_field_records->length(); 1398 assert(efr_len % 2 == 0, "sanity"); 1399 for (int i = 0; i < efr_len; i += 2) { 1400 int root_index = entry_field_records->at(i+1); 1401 clear_root(root_index); 1402 } 1403 } 1404 } 1405 } 1406 1407 // Push all oop fields (or oop array elemenets in case of an objArray) in 1408 // _referencing_obj onto the _stack. 1409 class HeapShared::OopFieldPusher: public BasicOopIterateClosure { 1410 PendingOopStack* _stack; 1411 GrowableArray<oop> _found_oop_fields; 1412 int _level; 1413 bool _record_klasses_only; 1414 KlassSubGraphInfo* _subgraph_info; 1415 oop _referencing_obj; 1416 bool _is_java_lang_ref; 1417 public: 1418 OopFieldPusher(PendingOopStack* stack, 1419 int level, 1420 bool record_klasses_only, 1421 KlassSubGraphInfo* subgraph_info, 1422 oop orig) : 1423 _stack(stack), 1424 _found_oop_fields(), 1425 _level(level), 1426 _record_klasses_only(record_klasses_only), 1427 _subgraph_info(subgraph_info), 1428 _referencing_obj(orig) { 1429 _is_java_lang_ref = AOTReferenceObjSupport::check_if_ref_obj(orig); 1430 } 1431 void do_oop(narrowOop *p) { OopFieldPusher::do_oop_work(p); } 1432 void do_oop( oop *p) { OopFieldPusher::do_oop_work(p); } 1433 1434 ~OopFieldPusher() { 1435 while (_found_oop_fields.length() > 0) { 1436 // This produces the exact same traversal order as the previous version 1437 // of OopFieldPusher that recurses on the C stack -- a depth-first search, 1438 // walking the oop fields in _referencing_obj by ascending field offsets. 1439 oop obj = _found_oop_fields.pop(); 1440 _stack->push(PendingOop(obj, _referencing_obj, _level + 1)); 1441 } 1442 } 1443 1444 protected: 1445 template <class T> void do_oop_work(T *p) { 1446 int field_offset = pointer_delta_as_int((char*)p, cast_from_oop<char*>(_referencing_obj)); 1447 oop obj = HeapAccess<ON_UNKNOWN_OOP_REF>::oop_load_at(_referencing_obj, field_offset); 1448 if (!CompressedOops::is_null(obj)) { 1449 if (_is_java_lang_ref && AOTReferenceObjSupport::skip_field(field_offset)) { 1450 // Do not follow these fields. They will be cleared to null. 1451 return; 1452 } 1453 1454 if (!_record_klasses_only && log_is_enabled(Debug, aot, heap)) { 1455 ResourceMark rm; 1456 log_debug(aot, heap)("(%d) %s[%d] ==> " PTR_FORMAT " size %zu %s", _level, 1457 _referencing_obj->klass()->external_name(), field_offset, 1458 p2i(obj), obj->size() * HeapWordSize, obj->klass()->external_name()); 1459 if (log_is_enabled(Trace, aot, heap)) { 1460 LogTarget(Trace, aot, heap) log; 1461 LogStream out(log); 1462 obj->print_on(&out); 1463 } 1464 } 1465 1466 _found_oop_fields.push(obj); 1467 } 1468 } 1469 1470 public: 1471 oop referencing_obj() { return _referencing_obj; } 1472 KlassSubGraphInfo* subgraph_info() { return _subgraph_info; } 1473 }; 1474 1475 // Checks if an oop has any non-null oop fields 1476 class PointsToOopsChecker : public BasicOopIterateClosure { 1477 bool _result; 1478 1479 template <class T> void check(T *p) { 1480 _result |= (HeapAccess<>::oop_load(p) != nullptr); 1481 } 1482 1483 public: 1484 PointsToOopsChecker() : _result(false) {} 1485 void do_oop(narrowOop *p) { check(p); } 1486 void do_oop( oop *p) { check(p); } 1487 bool result() { return _result; } 1488 }; 1489 1490 HeapShared::CachedOopInfo HeapShared::make_cached_oop_info(oop obj, oop referrer) { 1491 PointsToOopsChecker points_to_oops_checker; 1492 obj->oop_iterate(&points_to_oops_checker); 1493 return CachedOopInfo(OopHandle(Universe::vm_global(), referrer), points_to_oops_checker.result()); 1494 } 1495 1496 void HeapShared::init_box_classes(TRAPS) { 1497 if (ArchiveHeapLoader::is_in_use()) { 1498 vmClasses::Boolean_klass()->initialize(CHECK); 1499 vmClasses::Character_klass()->initialize(CHECK); 1500 vmClasses::Float_klass()->initialize(CHECK); 1501 vmClasses::Double_klass()->initialize(CHECK); 1502 vmClasses::Byte_klass()->initialize(CHECK); 1503 vmClasses::Short_klass()->initialize(CHECK); 1504 vmClasses::Integer_klass()->initialize(CHECK); 1505 vmClasses::Long_klass()->initialize(CHECK); 1506 vmClasses::Void_klass()->initialize(CHECK); 1507 } 1508 } 1509 1510 // (1) If orig_obj has not been archived yet, archive it. 1511 // (2) If orig_obj has not been seen yet (since start_recording_subgraph() was called), 1512 // trace all objects that are reachable from it, and make sure these objects are archived. 1513 // (3) Record the klasses of all objects that are reachable from orig_obj (including those that 1514 // were already archived when this function is called) 1515 bool HeapShared::archive_reachable_objects_from(int level, 1516 KlassSubGraphInfo* subgraph_info, 1517 oop orig_obj) { 1518 assert(orig_obj != nullptr, "must be"); 1519 PendingOopStack stack; 1520 stack.push(PendingOop(orig_obj, nullptr, level)); 1521 1522 while (stack.length() > 0) { 1523 PendingOop po = stack.pop(); 1524 _object_being_archived = po; 1525 bool status = walk_one_object(&stack, po.level(), subgraph_info, po.obj(), po.referrer()); 1526 _object_being_archived = PendingOop(); 1527 1528 if (!status) { 1529 // Don't archive a subgraph root that's too big. For archives static fields, that's OK 1530 // as the Java code will take care of initializing this field dynamically. 1531 assert(level == 1, "VM should have exited with unarchivable objects for _level > 1"); 1532 return false; 1533 } 1534 } 1535 1536 return true; 1537 } 1538 1539 bool HeapShared::walk_one_object(PendingOopStack* stack, int level, KlassSubGraphInfo* subgraph_info, 1540 oop orig_obj, oop referrer) { 1541 assert(orig_obj != nullptr, "must be"); 1542 if (!JavaClasses::is_supported_for_archiving(orig_obj)) { 1543 // This object has injected fields that cannot be supported easily, so we disallow them for now. 1544 // If you get an error here, you probably made a change in the JDK library that has added 1545 // these objects that are referenced (directly or indirectly) by static fields. 1546 ResourceMark rm; 1547 log_error(aot, heap)("Cannot archive object " PTR_FORMAT " of class %s", p2i(orig_obj), orig_obj->klass()->external_name()); 1548 debug_trace(); 1549 AOTMetaspace::unrecoverable_writing_error(); 1550 } 1551 1552 if (log_is_enabled(Debug, aot, heap) && java_lang_Class::is_instance(orig_obj)) { 1553 ResourceMark rm; 1554 LogTarget(Debug, aot, heap) log; 1555 LogStream out(log); 1556 out.print("Found java mirror " PTR_FORMAT " ", p2i(orig_obj)); 1557 Klass* k = java_lang_Class::as_Klass(orig_obj); 1558 if (k != nullptr) { 1559 out.print("%s", k->external_name()); 1560 } else { 1561 out.print("primitive"); 1562 } 1563 out.print_cr("; scratch mirror = " PTR_FORMAT, 1564 p2i(scratch_java_mirror(orig_obj))); 1565 } 1566 1567 if (java_lang_Class::is_instance(orig_obj)) { 1568 Klass* k = java_lang_Class::as_Klass(orig_obj); 1569 if (RegeneratedClasses::has_been_regenerated(k)) { 1570 orig_obj = RegeneratedClasses::get_regenerated_object(k)->java_mirror(); 1571 } 1572 } 1573 1574 if (CDSConfig::is_initing_classes_at_dump_time()) { 1575 if (java_lang_Class::is_instance(orig_obj)) { 1576 orig_obj = scratch_java_mirror(orig_obj); 1577 assert(orig_obj != nullptr, "must be archived"); 1578 } 1579 } else if (java_lang_Class::is_instance(orig_obj) && subgraph_info != _dump_time_special_subgraph) { 1580 // Without CDSConfig::is_initing_classes_at_dump_time(), we only allow archived objects to 1581 // point to the mirrors of (1) j.l.Object, (2) primitive classes, and (3) box classes. These are initialized 1582 // very early by HeapShared::init_box_classes(). 1583 if (orig_obj == vmClasses::Object_klass()->java_mirror() 1584 || java_lang_Class::is_primitive(orig_obj) 1585 || orig_obj == vmClasses::Boolean_klass()->java_mirror() 1586 || orig_obj == vmClasses::Character_klass()->java_mirror() 1587 || orig_obj == vmClasses::Float_klass()->java_mirror() 1588 || orig_obj == vmClasses::Double_klass()->java_mirror() 1589 || orig_obj == vmClasses::Byte_klass()->java_mirror() 1590 || orig_obj == vmClasses::Short_klass()->java_mirror() 1591 || orig_obj == vmClasses::Integer_klass()->java_mirror() 1592 || orig_obj == vmClasses::Long_klass()->java_mirror() 1593 || orig_obj == vmClasses::Void_klass()->java_mirror()) { 1594 orig_obj = scratch_java_mirror(orig_obj); 1595 assert(orig_obj != nullptr, "must be archived"); 1596 } else { 1597 // If you get an error here, you probably made a change in the JDK library that has added a Class 1598 // object that is referenced (directly or indirectly) by an ArchivableStaticFieldInfo 1599 // defined at the top of this file. 1600 log_error(aot, heap)("(%d) Unknown java.lang.Class object is in the archived sub-graph", level); 1601 debug_trace(); 1602 AOTMetaspace::unrecoverable_writing_error(); 1603 } 1604 } 1605 1606 if (has_been_seen_during_subgraph_recording(orig_obj)) { 1607 // orig_obj has already been archived and traced. Nothing more to do. 1608 return true; 1609 } else { 1610 set_has_been_seen_during_subgraph_recording(orig_obj); 1611 } 1612 1613 bool already_archived = has_been_archived(orig_obj); 1614 bool record_klasses_only = already_archived; 1615 if (!already_archived) { 1616 ++_num_new_archived_objs; 1617 if (!archive_object(orig_obj, referrer, subgraph_info)) { 1618 // Skip archiving the sub-graph referenced from the current entry field. 1619 ResourceMark rm; 1620 log_error(aot, heap)( 1621 "Cannot archive the sub-graph referenced from %s object (" 1622 PTR_FORMAT ") size %zu, skipped.", 1623 orig_obj->klass()->external_name(), p2i(orig_obj), orig_obj->size() * HeapWordSize); 1624 if (level == 1) { 1625 // Don't archive a subgraph root that's too big. For archives static fields, that's OK 1626 // as the Java code will take care of initializing this field dynamically. 1627 return false; 1628 } else { 1629 // We don't know how to handle an object that has been archived, but some of its reachable 1630 // objects cannot be archived. Bail out for now. We might need to fix this in the future if 1631 // we have a real use case. 1632 AOTMetaspace::unrecoverable_writing_error(); 1633 } 1634 } 1635 } 1636 1637 Klass *orig_k = orig_obj->klass(); 1638 subgraph_info->add_subgraph_object_klass(orig_k); 1639 1640 { 1641 // Find all the oops that are referenced by orig_obj, push them onto the stack 1642 // so we can work on them next. 1643 ResourceMark rm; 1644 OopFieldPusher pusher(stack, level, record_klasses_only, subgraph_info, orig_obj); 1645 orig_obj->oop_iterate(&pusher); 1646 } 1647 1648 if (CDSConfig::is_initing_classes_at_dump_time()) { 1649 // The classes of all archived enum instances have been marked as aot-init, 1650 // so there's nothing else to be done in the production run. 1651 } else { 1652 // This is legacy support for enum classes before JEP 483 -- we cannot rerun 1653 // the enum's <clinit> in the production run, so special handling is needed. 1654 if (CDSEnumKlass::is_enum_obj(orig_obj)) { 1655 CDSEnumKlass::handle_enum_obj(level + 1, subgraph_info, orig_obj); 1656 } 1657 } 1658 1659 return true; 1660 } 1661 1662 // 1663 // Start from the given static field in a java mirror and archive the 1664 // complete sub-graph of java heap objects that are reached directly 1665 // or indirectly from the starting object by following references. 1666 // Sub-graph archiving restrictions (current): 1667 // 1668 // - All classes of objects in the archived sub-graph (including the 1669 // entry class) must be boot class only. 1670 // - No java.lang.Class instance (java mirror) can be included inside 1671 // an archived sub-graph. Mirror can only be the sub-graph entry object. 1672 // 1673 // The Java heap object sub-graph archiving process (see OopFieldPusher): 1674 // 1675 // 1) Java object sub-graph archiving starts from a given static field 1676 // within a Class instance (java mirror). If the static field is a 1677 // reference field and points to a non-null java object, proceed to 1678 // the next step. 1679 // 1680 // 2) Archives the referenced java object. If an archived copy of the 1681 // current object already exists, updates the pointer in the archived 1682 // copy of the referencing object to point to the current archived object. 1683 // Otherwise, proceed to the next step. 1684 // 1685 // 3) Follows all references within the current java object and recursively 1686 // archive the sub-graph of objects starting from each reference. 1687 // 1688 // 4) Updates the pointer in the archived copy of referencing object to 1689 // point to the current archived object. 1690 // 1691 // 5) The Klass of the current java object is added to the list of Klasses 1692 // for loading and initializing before any object in the archived graph can 1693 // be accessed at runtime. 1694 // 1695 void HeapShared::archive_reachable_objects_from_static_field(InstanceKlass *k, 1696 const char* klass_name, 1697 int field_offset, 1698 const char* field_name) { 1699 assert(CDSConfig::is_dumping_heap(), "dump time only"); 1700 assert(k->defined_by_boot_loader(), "must be boot class"); 1701 1702 oop m = k->java_mirror(); 1703 1704 KlassSubGraphInfo* subgraph_info = get_subgraph_info(k); 1705 oop f = m->obj_field(field_offset); 1706 1707 log_debug(aot, heap)("Start archiving from: %s::%s (" PTR_FORMAT ")", klass_name, field_name, p2i(f)); 1708 1709 if (!CompressedOops::is_null(f)) { 1710 if (log_is_enabled(Trace, aot, heap)) { 1711 LogTarget(Trace, aot, heap) log; 1712 LogStream out(log); 1713 f->print_on(&out); 1714 } 1715 1716 bool success = archive_reachable_objects_from(1, subgraph_info, f); 1717 if (!success) { 1718 log_error(aot, heap)("Archiving failed %s::%s (some reachable objects cannot be archived)", 1719 klass_name, field_name); 1720 } else { 1721 // Note: the field value is not preserved in the archived mirror. 1722 // Record the field as a new subGraph entry point. The recorded 1723 // information is restored from the archive at runtime. 1724 subgraph_info->add_subgraph_entry_field(field_offset, f); 1725 log_info(aot, heap)("Archived field %s::%s => " PTR_FORMAT, klass_name, field_name, p2i(f)); 1726 } 1727 } else { 1728 // The field contains null, we still need to record the entry point, 1729 // so it can be restored at runtime. 1730 subgraph_info->add_subgraph_entry_field(field_offset, nullptr); 1731 } 1732 } 1733 1734 #ifndef PRODUCT 1735 class VerifySharedOopClosure: public BasicOopIterateClosure { 1736 public: 1737 void do_oop(narrowOop *p) { VerifySharedOopClosure::do_oop_work(p); } 1738 void do_oop( oop *p) { VerifySharedOopClosure::do_oop_work(p); } 1739 1740 protected: 1741 template <class T> void do_oop_work(T *p) { 1742 oop obj = RawAccess<>::oop_load(p); 1743 if (!CompressedOops::is_null(obj)) { 1744 HeapShared::verify_reachable_objects_from(obj); 1745 } 1746 } 1747 }; 1748 1749 void HeapShared::verify_subgraph_from_static_field(InstanceKlass* k, int field_offset) { 1750 assert(CDSConfig::is_dumping_heap(), "dump time only"); 1751 assert(k->defined_by_boot_loader(), "must be boot class"); 1752 1753 oop m = k->java_mirror(); 1754 oop f = m->obj_field(field_offset); 1755 if (!CompressedOops::is_null(f)) { 1756 verify_subgraph_from(f); 1757 } 1758 } 1759 1760 void HeapShared::verify_subgraph_from(oop orig_obj) { 1761 if (!has_been_archived(orig_obj)) { 1762 // It's OK for the root of a subgraph to be not archived. See comments in 1763 // archive_reachable_objects_from(). 1764 return; 1765 } 1766 1767 // Verify that all objects reachable from orig_obj are archived. 1768 init_seen_objects_table(); 1769 verify_reachable_objects_from(orig_obj); 1770 delete_seen_objects_table(); 1771 } 1772 1773 void HeapShared::verify_reachable_objects_from(oop obj) { 1774 _num_total_verifications ++; 1775 if (java_lang_Class::is_instance(obj)) { 1776 obj = scratch_java_mirror(obj); 1777 assert(obj != nullptr, "must be"); 1778 } 1779 if (!has_been_seen_during_subgraph_recording(obj)) { 1780 set_has_been_seen_during_subgraph_recording(obj); 1781 assert(has_been_archived(obj), "must be"); 1782 VerifySharedOopClosure walker; 1783 obj->oop_iterate(&walker); 1784 } 1785 } 1786 #endif 1787 1788 void HeapShared::check_special_subgraph_classes() { 1789 if (CDSConfig::is_initing_classes_at_dump_time()) { 1790 // We can have aot-initialized classes (such as Enums) that can reference objects 1791 // of arbitrary types. Currently, we trust the JEP 483 implementation to only 1792 // aot-initialize classes that are "safe". 1793 // 1794 // TODO: we need an automatic tool that checks the safety of aot-initialized 1795 // classes (when we extend the set of aot-initialized classes beyond JEP 483) 1796 return; 1797 } else { 1798 // In this case, the special subgraph should contain a few specific types 1799 GrowableArray<Klass*>* klasses = _dump_time_special_subgraph->subgraph_object_klasses(); 1800 int num = klasses->length(); 1801 for (int i = 0; i < num; i++) { 1802 Klass* subgraph_k = klasses->at(i); 1803 Symbol* name = subgraph_k->name(); 1804 if (subgraph_k->is_instance_klass() && 1805 name != vmSymbols::java_lang_Class() && 1806 name != vmSymbols::java_lang_String() && 1807 name != vmSymbols::java_lang_ArithmeticException() && 1808 name != vmSymbols::java_lang_ArrayIndexOutOfBoundsException() && 1809 name != vmSymbols::java_lang_ArrayStoreException() && 1810 name != vmSymbols::java_lang_ClassCastException() && 1811 name != vmSymbols::java_lang_InternalError() && 1812 name != vmSymbols::java_lang_NullPointerException()) { 1813 ResourceMark rm; 1814 fatal("special subgraph cannot have objects of type %s", subgraph_k->external_name()); 1815 } 1816 } 1817 } 1818 } 1819 1820 HeapShared::SeenObjectsTable* HeapShared::_seen_objects_table = nullptr; 1821 HeapShared::PendingOop HeapShared::_object_being_archived; 1822 int HeapShared::_num_new_walked_objs; 1823 int HeapShared::_num_new_archived_objs; 1824 int HeapShared::_num_old_recorded_klasses; 1825 1826 int HeapShared::_num_total_subgraph_recordings = 0; 1827 int HeapShared::_num_total_walked_objs = 0; 1828 int HeapShared::_num_total_archived_objs = 0; 1829 int HeapShared::_num_total_recorded_klasses = 0; 1830 int HeapShared::_num_total_verifications = 0; 1831 1832 bool HeapShared::has_been_seen_during_subgraph_recording(oop obj) { 1833 return _seen_objects_table->get(obj) != nullptr; 1834 } 1835 1836 void HeapShared::set_has_been_seen_during_subgraph_recording(oop obj) { 1837 assert(!has_been_seen_during_subgraph_recording(obj), "sanity"); 1838 _seen_objects_table->put_when_absent(obj, true); 1839 _seen_objects_table->maybe_grow(); 1840 ++ _num_new_walked_objs; 1841 } 1842 1843 void HeapShared::start_recording_subgraph(InstanceKlass *k, const char* class_name, bool is_full_module_graph) { 1844 log_info(aot, heap)("Start recording subgraph(s) for archived fields in %s", class_name); 1845 init_subgraph_info(k, is_full_module_graph); 1846 init_seen_objects_table(); 1847 _num_new_walked_objs = 0; 1848 _num_new_archived_objs = 0; 1849 _num_old_recorded_klasses = get_subgraph_info(k)->num_subgraph_object_klasses(); 1850 } 1851 1852 void HeapShared::done_recording_subgraph(InstanceKlass *k, const char* class_name) { 1853 int num_new_recorded_klasses = get_subgraph_info(k)->num_subgraph_object_klasses() - 1854 _num_old_recorded_klasses; 1855 log_info(aot, heap)("Done recording subgraph(s) for archived fields in %s: " 1856 "walked %d objs, archived %d new objs, recorded %d classes", 1857 class_name, _num_new_walked_objs, _num_new_archived_objs, 1858 num_new_recorded_klasses); 1859 1860 delete_seen_objects_table(); 1861 1862 _num_total_subgraph_recordings ++; 1863 _num_total_walked_objs += _num_new_walked_objs; 1864 _num_total_archived_objs += _num_new_archived_objs; 1865 _num_total_recorded_klasses += num_new_recorded_klasses; 1866 } 1867 1868 class ArchivableStaticFieldFinder: public FieldClosure { 1869 InstanceKlass* _ik; 1870 Symbol* _field_name; 1871 bool _found; 1872 int _offset; 1873 public: 1874 ArchivableStaticFieldFinder(InstanceKlass* ik, Symbol* field_name) : 1875 _ik(ik), _field_name(field_name), _found(false), _offset(-1) {} 1876 1877 virtual void do_field(fieldDescriptor* fd) { 1878 if (fd->name() == _field_name) { 1879 assert(!_found, "fields can never be overloaded"); 1880 if (is_reference_type(fd->field_type())) { 1881 _found = true; 1882 _offset = fd->offset(); 1883 } 1884 } 1885 } 1886 bool found() { return _found; } 1887 int offset() { return _offset; } 1888 }; 1889 1890 void HeapShared::init_subgraph_entry_fields(ArchivableStaticFieldInfo fields[], 1891 TRAPS) { 1892 for (int i = 0; fields[i].valid(); i++) { 1893 ArchivableStaticFieldInfo* info = &fields[i]; 1894 TempNewSymbol klass_name = SymbolTable::new_symbol(info->klass_name); 1895 TempNewSymbol field_name = SymbolTable::new_symbol(info->field_name); 1896 ResourceMark rm; // for stringStream::as_string() etc. 1897 1898 #ifndef PRODUCT 1899 bool is_test_class = (ArchiveHeapTestClass != nullptr) && (strcmp(info->klass_name, ArchiveHeapTestClass) == 0); 1900 const char* test_class_name = ArchiveHeapTestClass; 1901 #else 1902 bool is_test_class = false; 1903 const char* test_class_name = ""; // avoid C++ printf checks warnings. 1904 #endif 1905 1906 if (is_test_class) { 1907 log_warning(aot)("Loading ArchiveHeapTestClass %s ...", test_class_name); 1908 } 1909 1910 Klass* k = SystemDictionary::resolve_or_fail(klass_name, true, THREAD); 1911 if (HAS_PENDING_EXCEPTION) { 1912 CLEAR_PENDING_EXCEPTION; 1913 stringStream st; 1914 st.print("Fail to initialize archive heap: %s cannot be loaded by the boot loader", info->klass_name); 1915 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1916 } 1917 1918 if (!k->is_instance_klass()) { 1919 stringStream st; 1920 st.print("Fail to initialize archive heap: %s is not an instance class", info->klass_name); 1921 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1922 } 1923 1924 InstanceKlass* ik = InstanceKlass::cast(k); 1925 assert(InstanceKlass::cast(ik)->defined_by_boot_loader(), 1926 "Only support boot classes"); 1927 1928 if (is_test_class) { 1929 if (ik->module()->is_named()) { 1930 // We don't want ArchiveHeapTestClass to be abused to easily load/initialize arbitrary 1931 // core-lib classes. You need to at least append to the bootclasspath. 1932 stringStream st; 1933 st.print("ArchiveHeapTestClass %s is not in unnamed module", test_class_name); 1934 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1935 } 1936 1937 if (ik->package() != nullptr) { 1938 // This restriction makes HeapShared::is_a_test_class_in_unnamed_module() easy. 1939 stringStream st; 1940 st.print("ArchiveHeapTestClass %s is not in unnamed package", test_class_name); 1941 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1942 } 1943 } else { 1944 if (ik->module()->name() != vmSymbols::java_base()) { 1945 // We don't want to deal with cases when a module is unavailable at runtime. 1946 // FUTURE -- load from archived heap only when module graph has not changed 1947 // between dump and runtime. 1948 stringStream st; 1949 st.print("%s is not in java.base module", info->klass_name); 1950 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1951 } 1952 } 1953 1954 if (is_test_class) { 1955 log_warning(aot)("Initializing ArchiveHeapTestClass %s ...", test_class_name); 1956 } 1957 ik->initialize(CHECK); 1958 1959 ArchivableStaticFieldFinder finder(ik, field_name); 1960 ik->do_local_static_fields(&finder); 1961 if (!finder.found()) { 1962 stringStream st; 1963 st.print("Unable to find the static T_OBJECT field %s::%s", info->klass_name, info->field_name); 1964 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), st.as_string()); 1965 } 1966 1967 info->klass = ik; 1968 info->offset = finder.offset(); 1969 } 1970 } 1971 1972 void HeapShared::init_subgraph_entry_fields(TRAPS) { 1973 assert(CDSConfig::is_dumping_heap(), "must be"); 1974 _dump_time_subgraph_info_table = new (mtClass)DumpTimeKlassSubGraphInfoTable(); 1975 init_subgraph_entry_fields(archive_subgraph_entry_fields, CHECK); 1976 if (CDSConfig::is_dumping_full_module_graph()) { 1977 init_subgraph_entry_fields(fmg_archive_subgraph_entry_fields, CHECK); 1978 } 1979 } 1980 1981 #ifndef PRODUCT 1982 void HeapShared::setup_test_class(const char* test_class_name) { 1983 ArchivableStaticFieldInfo* p = archive_subgraph_entry_fields; 1984 int num_slots = sizeof(archive_subgraph_entry_fields) / sizeof(ArchivableStaticFieldInfo); 1985 assert(p[num_slots - 2].klass_name == nullptr, "must have empty slot that's patched below"); 1986 assert(p[num_slots - 1].klass_name == nullptr, "must have empty slot that marks the end of the list"); 1987 1988 if (test_class_name != nullptr) { 1989 p[num_slots - 2].klass_name = test_class_name; 1990 p[num_slots - 2].field_name = ARCHIVE_TEST_FIELD_NAME; 1991 } 1992 } 1993 1994 // See if ik is one of the test classes that are pulled in by -XX:ArchiveHeapTestClass 1995 // during runtime. This may be called before the module system is initialized so 1996 // we cannot rely on InstanceKlass::module(), etc. 1997 bool HeapShared::is_a_test_class_in_unnamed_module(Klass* ik) { 1998 if (_test_class != nullptr) { 1999 if (ik == _test_class) { 2000 return true; 2001 } 2002 Array<Klass*>* klasses = _test_class_record->subgraph_object_klasses(); 2003 if (klasses == nullptr) { 2004 return false; 2005 } 2006 2007 for (int i = 0; i < klasses->length(); i++) { 2008 Klass* k = klasses->at(i); 2009 if (k == ik) { 2010 Symbol* name; 2011 if (k->is_instance_klass()) { 2012 name = InstanceKlass::cast(k)->name(); 2013 } else if (k->is_objArray_klass()) { 2014 Klass* bk = ObjArrayKlass::cast(k)->bottom_klass(); 2015 if (!bk->is_instance_klass()) { 2016 return false; 2017 } 2018 name = bk->name(); 2019 } else { 2020 return false; 2021 } 2022 2023 // See KlassSubGraphInfo::check_allowed_klass() - we only allow test classes 2024 // to be: 2025 // (A) java.base classes (which must not be in the unnamed module) 2026 // (B) test classes which must be in the unnamed package of the unnamed module. 2027 // So if we see a '/' character in the class name, it must be in (A); 2028 // otherwise it must be in (B). 2029 if (name->index_of_at(0, "/", 1) >= 0) { 2030 return false; // (A) 2031 } 2032 2033 return true; // (B) 2034 } 2035 } 2036 } 2037 2038 return false; 2039 } 2040 2041 void HeapShared::initialize_test_class_from_archive(JavaThread* current) { 2042 Klass* k = _test_class; 2043 if (k != nullptr && ArchiveHeapLoader::is_in_use()) { 2044 JavaThread* THREAD = current; 2045 ExceptionMark em(THREAD); 2046 const ArchivedKlassSubGraphInfoRecord* record = 2047 resolve_or_init_classes_for_subgraph_of(k, /*do_init=*/false, THREAD); 2048 2049 // The _test_class is in the unnamed module, so it can't call CDS.initializeFromArchive() 2050 // from its <clinit> method. So we set up its "archivedObjects" field first, before 2051 // calling its <clinit>. This is not strictly clean, but it's a convenient way to write unit 2052 // test cases (see test/hotspot/jtreg/runtime/cds/appcds/cacheObject/ArchiveHeapTestClass.java). 2053 if (record != nullptr) { 2054 init_archived_fields_for(k, record); 2055 } 2056 resolve_or_init_classes_for_subgraph_of(k, /*do_init=*/true, THREAD); 2057 } 2058 } 2059 #endif 2060 2061 void HeapShared::init_for_dumping(TRAPS) { 2062 if (CDSConfig::is_dumping_heap()) { 2063 setup_test_class(ArchiveHeapTestClass); 2064 _dumped_interned_strings = new (mtClass)DumpedInternedStrings(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE); 2065 init_subgraph_entry_fields(CHECK); 2066 } 2067 } 2068 2069 void HeapShared::archive_object_subgraphs(ArchivableStaticFieldInfo fields[], 2070 bool is_full_module_graph) { 2071 _num_total_subgraph_recordings = 0; 2072 _num_total_walked_objs = 0; 2073 _num_total_archived_objs = 0; 2074 _num_total_recorded_klasses = 0; 2075 _num_total_verifications = 0; 2076 2077 // For each class X that has one or more archived fields: 2078 // [1] Dump the subgraph of each archived field 2079 // [2] Create a list of all the class of the objects that can be reached 2080 // by any of these static fields. 2081 // At runtime, these classes are initialized before X's archived fields 2082 // are restored by HeapShared::initialize_from_archived_subgraph(). 2083 for (int i = 0; fields[i].valid(); ) { 2084 ArchivableStaticFieldInfo* info = &fields[i]; 2085 const char* klass_name = info->klass_name; 2086 start_recording_subgraph(info->klass, klass_name, is_full_module_graph); 2087 2088 // If you have specified consecutive fields of the same klass in 2089 // fields[], these will be archived in the same 2090 // {start_recording_subgraph ... done_recording_subgraph} pass to 2091 // save time. 2092 for (; fields[i].valid(); i++) { 2093 ArchivableStaticFieldInfo* f = &fields[i]; 2094 if (f->klass_name != klass_name) { 2095 break; 2096 } 2097 2098 archive_reachable_objects_from_static_field(f->klass, f->klass_name, 2099 f->offset, f->field_name); 2100 } 2101 done_recording_subgraph(info->klass, klass_name); 2102 } 2103 2104 log_info(aot, heap)("Archived subgraph records = %d", 2105 _num_total_subgraph_recordings); 2106 log_info(aot, heap)(" Walked %d objects", _num_total_walked_objs); 2107 log_info(aot, heap)(" Archived %d objects", _num_total_archived_objs); 2108 log_info(aot, heap)(" Recorded %d klasses", _num_total_recorded_klasses); 2109 2110 #ifndef PRODUCT 2111 for (int i = 0; fields[i].valid(); i++) { 2112 ArchivableStaticFieldInfo* f = &fields[i]; 2113 verify_subgraph_from_static_field(f->klass, f->offset); 2114 } 2115 log_info(aot, heap)(" Verified %d references", _num_total_verifications); 2116 #endif 2117 } 2118 2119 // Keep track of the contents of the archived interned string table. This table 2120 // is used only by CDSHeapVerifier. 2121 void HeapShared::add_to_dumped_interned_strings(oop string) { 2122 assert_at_safepoint(); // DumpedInternedStrings uses raw oops 2123 assert(!ArchiveHeapWriter::is_string_too_large_to_archive(string), "must be"); 2124 bool created; 2125 _dumped_interned_strings->put_if_absent(string, true, &created); 2126 if (created) { 2127 // Prevent string deduplication from changing the value field to 2128 // something not in the archive. 2129 java_lang_String::set_deduplication_forbidden(string); 2130 _dumped_interned_strings->maybe_grow(); 2131 } 2132 } 2133 2134 bool HeapShared::is_dumped_interned_string(oop o) { 2135 return _dumped_interned_strings->get(o) != nullptr; 2136 } 2137 2138 // These tables should be used only within the CDS safepoint, so 2139 // delete them before we exit the safepoint. Otherwise the table will 2140 // contain bad oops after a GC. 2141 void HeapShared::delete_tables_with_raw_oops() { 2142 assert(_seen_objects_table == nullptr, "should have been deleted"); 2143 2144 delete _dumped_interned_strings; 2145 _dumped_interned_strings = nullptr; 2146 2147 ArchiveHeapWriter::delete_tables_with_raw_oops(); 2148 } 2149 2150 void HeapShared::debug_trace() { 2151 ResourceMark rm; 2152 oop referrer = _object_being_archived.referrer(); 2153 if (referrer != nullptr) { 2154 LogStream ls(Log(aot, heap)::error()); 2155 ls.print_cr("Reference trace"); 2156 CDSHeapVerifier::trace_to_root(&ls, referrer); 2157 } 2158 } 2159 2160 #ifndef PRODUCT 2161 // At dump-time, find the location of all the non-null oop pointers in an archived heap 2162 // region. This way we can quickly relocate all the pointers without using 2163 // BasicOopIterateClosure at runtime. 2164 class FindEmbeddedNonNullPointers: public BasicOopIterateClosure { 2165 void* _start; 2166 BitMap *_oopmap; 2167 int _num_total_oops; 2168 int _num_null_oops; 2169 public: 2170 FindEmbeddedNonNullPointers(void* start, BitMap* oopmap) 2171 : _start(start), _oopmap(oopmap), _num_total_oops(0), _num_null_oops(0) {} 2172 2173 virtual void do_oop(narrowOop* p) { 2174 assert(UseCompressedOops, "sanity"); 2175 _num_total_oops ++; 2176 narrowOop v = *p; 2177 if (!CompressedOops::is_null(v)) { 2178 size_t idx = p - (narrowOop*)_start; 2179 _oopmap->set_bit(idx); 2180 } else { 2181 _num_null_oops ++; 2182 } 2183 } 2184 virtual void do_oop(oop* p) { 2185 assert(!UseCompressedOops, "sanity"); 2186 _num_total_oops ++; 2187 if ((*p) != nullptr) { 2188 size_t idx = p - (oop*)_start; 2189 _oopmap->set_bit(idx); 2190 } else { 2191 _num_null_oops ++; 2192 } 2193 } 2194 int num_total_oops() const { return _num_total_oops; } 2195 int num_null_oops() const { return _num_null_oops; } 2196 }; 2197 #endif 2198 2199 void HeapShared::count_allocation(size_t size) { 2200 _total_obj_count ++; 2201 _total_obj_size += size; 2202 for (int i = 0; i < ALLOC_STAT_SLOTS; i++) { 2203 if (size <= (size_t(1) << i)) { 2204 _alloc_count[i] ++; 2205 _alloc_size[i] += size; 2206 return; 2207 } 2208 } 2209 } 2210 2211 static double avg_size(size_t size, size_t count) { 2212 double avg = 0; 2213 if (count > 0) { 2214 avg = double(size * HeapWordSize) / double(count); 2215 } 2216 return avg; 2217 } 2218 2219 void HeapShared::print_stats() { 2220 size_t huge_count = _total_obj_count; 2221 size_t huge_size = _total_obj_size; 2222 2223 for (int i = 0; i < ALLOC_STAT_SLOTS; i++) { 2224 size_t byte_size_limit = (size_t(1) << i) * HeapWordSize; 2225 size_t count = _alloc_count[i]; 2226 size_t size = _alloc_size[i]; 2227 log_info(aot, heap)("%8zu objects are <= %-6zu" 2228 " bytes (total %8zu bytes, avg %8.1f bytes)", 2229 count, byte_size_limit, size * HeapWordSize, avg_size(size, count)); 2230 huge_count -= count; 2231 huge_size -= size; 2232 } 2233 2234 log_info(aot, heap)("%8zu huge objects (total %8zu bytes" 2235 ", avg %8.1f bytes)", 2236 huge_count, huge_size * HeapWordSize, 2237 avg_size(huge_size, huge_count)); 2238 log_info(aot, heap)("%8zu total objects (total %8zu bytes" 2239 ", avg %8.1f bytes)", 2240 _total_obj_count, _total_obj_size * HeapWordSize, 2241 avg_size(_total_obj_size, _total_obj_count)); 2242 } 2243 2244 bool HeapShared::is_archived_boot_layer_available(JavaThread* current) { 2245 TempNewSymbol klass_name = SymbolTable::new_symbol(ARCHIVED_BOOT_LAYER_CLASS); 2246 InstanceKlass* k = SystemDictionary::find_instance_klass(current, klass_name, Handle()); 2247 if (k == nullptr) { 2248 return false; 2249 } else { 2250 TempNewSymbol field_name = SymbolTable::new_symbol(ARCHIVED_BOOT_LAYER_FIELD); 2251 TempNewSymbol field_signature = SymbolTable::new_symbol("Ljdk/internal/module/ArchivedBootLayer;"); 2252 fieldDescriptor fd; 2253 if (k->find_field(field_name, field_signature, true, &fd) != nullptr) { 2254 oop m = k->java_mirror(); 2255 oop f = m->obj_field(fd.offset()); 2256 if (CompressedOops::is_null(f)) { 2257 return false; 2258 } 2259 } else { 2260 return false; 2261 } 2262 } 2263 return true; 2264 } 2265 2266 #endif // INCLUDE_CDS_JAVA_HEAP