1 /* 2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "cds/archiveHeapLoader.hpp" 27 #include "cds/cdsConfig.hpp" 28 #include "cds/dynamicArchive.hpp" 29 #include "cds/heapShared.hpp" 30 #include "cds/metaspaceShared.hpp" 31 #include "classfile/classLoader.hpp" 32 #include "classfile/classLoaderDataGraph.hpp" 33 #include "classfile/javaClasses.hpp" 34 #include "classfile/stringTable.hpp" 35 #include "classfile/symbolTable.hpp" 36 #include "classfile/systemDictionary.hpp" 37 #include "classfile/vmClasses.hpp" 38 #include "classfile/vmSymbols.hpp" 39 #include "code/codeBehaviours.hpp" 40 #include "code/codeCache.hpp" 41 #include "compiler/oopMap.hpp" 42 #include "gc/shared/collectedHeap.inline.hpp" 43 #include "gc/shared/gcArguments.hpp" 44 #include "gc/shared/gcConfig.hpp" 45 #include "gc/shared/gcLogPrecious.hpp" 46 #include "gc/shared/gcTraceTime.inline.hpp" 47 #include "gc/shared/oopStorageSet.hpp" 48 #include "gc/shared/plab.hpp" 49 #include "gc/shared/stringdedup/stringDedup.hpp" 50 #include "gc/shared/tlab_globals.hpp" 51 #include "logging/log.hpp" 52 #include "logging/logStream.hpp" 53 #include "memory/metadataFactory.hpp" 54 #include "memory/metaspaceClosure.hpp" 55 #include "memory/metaspaceCounters.hpp" 56 #include "memory/metaspaceUtils.hpp" 57 #include "memory/oopFactory.hpp" 58 #include "memory/resourceArea.hpp" 59 #include "memory/universe.hpp" 60 #include "oops/compressedOops.hpp" 61 #include "oops/instanceKlass.hpp" 62 #include "oops/instanceMirrorKlass.hpp" 63 #include "oops/klass.inline.hpp" 64 #include "oops/objArrayOop.inline.hpp" 65 #include "oops/oop.inline.hpp" 66 #include "oops/oopHandle.inline.hpp" 67 #include "oops/typeArrayKlass.hpp" 68 #include "prims/resolvedMethodTable.hpp" 69 #include "runtime/arguments.hpp" 70 #include "runtime/atomic.hpp" 71 #include "runtime/cpuTimeCounters.hpp" 72 #include "runtime/flags/jvmFlagLimit.hpp" 73 #include "runtime/handles.inline.hpp" 74 #include "runtime/init.hpp" 75 #include "runtime/java.hpp" 76 #include "runtime/javaThread.hpp" 77 #include "runtime/jniHandles.hpp" 78 #include "runtime/threads.hpp" 79 #include "runtime/timerTrace.hpp" 80 #include "sanitizers/leak.hpp" 81 #include "services/memoryService.hpp" 82 #include "utilities/align.hpp" 83 #include "utilities/autoRestore.hpp" 84 #include "utilities/debug.hpp" 85 #include "utilities/formatBuffer.hpp" 86 #include "utilities/macros.hpp" 87 #include "utilities/ostream.hpp" 88 #include "utilities/preserveException.hpp" 89 90 // A helper class for caching a Method* when the user of the cache 91 // only cares about the latest version of the Method*. This cache safely 92 // interacts with the RedefineClasses API. 93 class LatestMethodCache { 94 // We save the InstanceKlass* and the idnum of Method* in order to get 95 // the current Method*. 96 InstanceKlass* _klass; 97 int _method_idnum; 98 99 public: 100 LatestMethodCache() { _klass = nullptr; _method_idnum = -1; } 101 102 void init(JavaThread* current, InstanceKlass* ik, const char* method, 103 Symbol* signature, bool is_static); 104 Method* get_method(); 105 }; 106 107 static LatestMethodCache _finalizer_register_cache; // Finalizer.register() 108 static LatestMethodCache _loader_addClass_cache; // ClassLoader.addClass() 109 static LatestMethodCache _throw_illegal_access_error_cache; // Unsafe.throwIllegalAccessError() 110 static LatestMethodCache _throw_no_such_method_error_cache; // Unsafe.throwNoSuchMethodError() 111 static LatestMethodCache _do_stack_walk_cache; // AbstractStackWalker.doStackWalk() 112 static LatestMethodCache _is_substitutable_cache; // ValueObjectMethods.isSubstitutable() 113 static LatestMethodCache _value_object_hash_code_cache; // ValueObjectMethods.valueObjectHashCode() 114 115 // Known objects 116 TypeArrayKlass* Universe::_typeArrayKlasses[T_LONG+1] = { nullptr /*, nullptr...*/ }; 117 ObjArrayKlass* Universe::_objectArrayKlass = nullptr; 118 Klass* Universe::_fillerArrayKlass = nullptr; 119 OopHandle Universe::_basic_type_mirrors[T_VOID+1]; 120 #if INCLUDE_CDS_JAVA_HEAP 121 int Universe::_archived_basic_type_mirror_indices[T_VOID+1]; 122 #endif 123 124 OopHandle Universe::_main_thread_group; 125 OopHandle Universe::_system_thread_group; 126 OopHandle Universe::_the_empty_class_array; 127 OopHandle Universe::_the_null_string; 128 OopHandle Universe::_the_min_jint_string; 129 130 OopHandle Universe::_the_null_sentinel; 131 132 // _out_of_memory_errors is an objArray 133 enum OutOfMemoryInstance { _oom_java_heap, 134 _oom_c_heap, 135 _oom_metaspace, 136 _oom_class_metaspace, 137 _oom_array_size, 138 _oom_gc_overhead_limit, 139 _oom_realloc_objects, 140 _oom_count }; 141 142 OopHandle Universe::_out_of_memory_errors; 143 OopHandle Universe:: _class_init_stack_overflow_error; 144 OopHandle Universe::_delayed_stack_overflow_error_message; 145 OopHandle Universe::_preallocated_out_of_memory_error_array; 146 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 147 148 // Message details for OOME objects, preallocate these objects since they could be 149 // used when throwing OOME, we should try to avoid further allocation in such case 150 OopHandle Universe::_msg_metaspace; 151 OopHandle Universe::_msg_class_metaspace; 152 153 OopHandle Universe::_reference_pending_list; 154 155 Array<Klass*>* Universe::_the_array_interfaces_array = nullptr; 156 157 long Universe::verify_flags = Universe::Verify_All; 158 159 Array<int>* Universe::_the_empty_int_array = nullptr; 160 Array<u2>* Universe::_the_empty_short_array = nullptr; 161 Array<Klass*>* Universe::_the_empty_klass_array = nullptr; 162 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = nullptr; 163 Array<Method*>* Universe::_the_empty_method_array = nullptr; 164 165 uintx Universe::_the_array_interfaces_bitmap = 0; 166 uintx Universe::_the_empty_klass_bitmap = 0; 167 168 // These variables are guarded by FullGCALot_lock. 169 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;) 170 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 171 172 // Heap 173 int Universe::_verify_count = 0; 174 175 // Oop verification (see MacroAssembler::verify_oop) 176 uintptr_t Universe::_verify_oop_mask = 0; 177 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 178 179 int Universe::_base_vtable_size = 0; 180 bool Universe::_bootstrapping = false; 181 bool Universe::_module_initialized = false; 182 bool Universe::_fully_initialized = false; 183 184 OopStorage* Universe::_vm_weak = nullptr; 185 OopStorage* Universe::_vm_global = nullptr; 186 187 CollectedHeap* Universe::_collectedHeap = nullptr; 188 189 // These are the exceptions that are always created and are guatanteed to exist. 190 // If possible, they can be stored as CDS archived objects to speed up AOT code. 191 class BuiltinException { 192 OopHandle _instance; 193 CDS_JAVA_HEAP_ONLY(int _archived_root_index;) 194 195 public: 196 BuiltinException() : _instance() { 197 CDS_JAVA_HEAP_ONLY(_archived_root_index = 0); 198 } 199 200 void init_if_empty(Symbol* symbol, TRAPS) { 201 if (_instance.is_empty()) { 202 Klass* k = SystemDictionary::resolve_or_fail(symbol, true, CHECK); 203 oop obj = InstanceKlass::cast(k)->allocate_instance(CHECK); 204 _instance = OopHandle(Universe::vm_global(), obj); 205 } 206 } 207 208 oop instance() { 209 return _instance.resolve(); 210 } 211 212 #if INCLUDE_CDS_JAVA_HEAP 213 void store_in_cds() { 214 _archived_root_index = HeapShared::archive_exception_instance(instance()); 215 } 216 217 void load_from_cds() { 218 if (_archived_root_index >= 0) { 219 oop obj = HeapShared::get_root(_archived_root_index); 220 assert(obj != nullptr, "must be"); 221 _instance = OopHandle(Universe::vm_global(), obj); 222 } 223 } 224 225 void serialize(SerializeClosure *f) { 226 f->do_int(&_archived_root_index); 227 } 228 #endif 229 }; 230 231 static BuiltinException _null_ptr_exception; 232 static BuiltinException _arithmetic_exception; 233 static BuiltinException _internal_error; 234 235 objArrayOop Universe::the_empty_class_array () { 236 return (objArrayOop)_the_empty_class_array.resolve(); 237 } 238 239 oop Universe::main_thread_group() { return _main_thread_group.resolve(); } 240 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); } 241 242 oop Universe::system_thread_group() { return _system_thread_group.resolve(); } 243 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); } 244 245 oop Universe::the_null_string() { return _the_null_string.resolve(); } 246 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); } 247 248 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception.instance(); } 249 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception.instance(); } 250 oop Universe::internal_error_instance() { return _internal_error.instance(); } 251 252 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); } 253 254 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); } 255 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); } 256 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); } 257 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); } 258 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); } 259 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); } 260 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); } 261 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); } 262 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); } 263 264 oop Universe::java_mirror(BasicType t) { 265 assert((uint)t < T_VOID+1, "range check"); 266 assert(!is_reference_type(t), "sanity"); 267 return check_mirror(_basic_type_mirrors[t].resolve()); 268 } 269 270 void Universe::basic_type_classes_do(KlassClosure *closure) { 271 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 272 closure->do_klass(_typeArrayKlasses[i]); 273 } 274 // We don't do the following because it will confuse JVMTI. 275 // _fillerArrayKlass is used only by GC, which doesn't need to see 276 // this klass from basic_type_classes_do(). 277 // 278 // closure->do_klass(_fillerArrayKlass); 279 } 280 281 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 282 it->push(&_fillerArrayKlass); 283 for (int i = 0; i < T_LONG+1; i++) { 284 it->push(&_typeArrayKlasses[i]); 285 } 286 it->push(&_objectArrayKlass); 287 288 it->push(&_the_empty_int_array); 289 it->push(&_the_empty_short_array); 290 it->push(&_the_empty_klass_array); 291 it->push(&_the_empty_instance_klass_array); 292 it->push(&_the_empty_method_array); 293 it->push(&_the_array_interfaces_array); 294 } 295 296 #if INCLUDE_CDS_JAVA_HEAP 297 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) { 298 assert(CDSConfig::is_dumping_heap(), "sanity"); 299 assert(!is_reference_type(t), "sanity"); 300 _archived_basic_type_mirror_indices[t] = index; 301 } 302 303 void Universe::archive_exception_instances() { 304 _null_ptr_exception.store_in_cds(); 305 _arithmetic_exception.store_in_cds(); 306 _internal_error.store_in_cds(); 307 } 308 309 void Universe::load_archived_object_instances() { 310 if (ArchiveHeapLoader::is_in_use()) { 311 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 312 int index = _archived_basic_type_mirror_indices[i]; 313 if (!is_reference_type((BasicType)i) && index >= 0) { 314 oop mirror_oop = HeapShared::get_root(index); 315 assert(mirror_oop != nullptr, "must be"); 316 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop); 317 } 318 } 319 320 _null_ptr_exception.load_from_cds(); 321 _arithmetic_exception.load_from_cds(); 322 _internal_error.load_from_cds(); 323 } 324 } 325 #endif 326 327 void Universe::serialize(SerializeClosure* f) { 328 329 #if INCLUDE_CDS_JAVA_HEAP 330 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 331 f->do_int(&_archived_basic_type_mirror_indices[i]); 332 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap 333 // contents may need to be relocated. _basic_type_mirrors[i] will be 334 // updated later in Universe::load_archived_object_instances(). 335 } 336 _null_ptr_exception.serialize(f); 337 _arithmetic_exception.serialize(f); 338 _internal_error.serialize(f); 339 #endif 340 341 f->do_ptr(&_fillerArrayKlass); 342 for (int i = 0; i < T_LONG+1; i++) { 343 f->do_ptr(&_typeArrayKlasses[i]); 344 } 345 346 f->do_ptr(&_objectArrayKlass); 347 f->do_ptr(&_the_array_interfaces_array); 348 f->do_ptr(&_the_empty_int_array); 349 f->do_ptr(&_the_empty_short_array); 350 f->do_ptr(&_the_empty_method_array); 351 f->do_ptr(&_the_empty_klass_array); 352 f->do_ptr(&_the_empty_instance_klass_array); 353 } 354 355 356 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 357 if (size < alignment || size % alignment != 0) { 358 vm_exit_during_initialization( 359 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 360 } 361 } 362 363 static void initialize_basic_type_klass(Klass* k, TRAPS) { 364 Klass* ok = vmClasses::Object_klass(); 365 #if INCLUDE_CDS 366 if (CDSConfig::is_using_archive()) { 367 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 368 assert(k->super() == ok, "u3"); 369 if (k->is_instance_klass()) { 370 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), nullptr, CHECK); 371 } else { 372 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK); 373 } 374 } else 375 #endif 376 { 377 k->initialize_supers(ok, nullptr, CHECK); 378 } 379 k->append_to_sibling_list(); 380 } 381 382 void Universe::genesis(TRAPS) { 383 ResourceMark rm(THREAD); 384 HandleMark hm(THREAD); 385 386 // Explicit null checks are needed if these offsets are not smaller than the page size 387 assert(oopDesc::klass_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()), 388 "Klass offset is expected to be less than the page size"); 389 assert(arrayOopDesc::length_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()), 390 "Array length offset is expected to be less than the page size"); 391 392 { AutoModifyRestore<bool> temporarily(_bootstrapping, true); 393 394 java_lang_Class::allocate_fixup_lists(); 395 396 // determine base vtable size; without that we cannot create the array klasses 397 compute_base_vtable_size(); 398 399 if (!CDSConfig::is_using_archive()) { 400 // Initialization of the fillerArrayKlass must come before regular 401 // int-TypeArrayKlass so that the int-Array mirror points to the 402 // int-TypeArrayKlass. 403 _fillerArrayKlass = TypeArrayKlass::create_klass(T_INT, "[Ljdk/internal/vm/FillerElement;", CHECK); 404 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 405 _typeArrayKlasses[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 406 } 407 408 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 409 410 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, nullptr, CHECK); 411 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 412 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 413 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 414 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 415 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 416 } 417 418 vmSymbols::initialize(); 419 420 SystemDictionary::initialize(CHECK); 421 422 // Create string constants 423 oop s = StringTable::intern("null", CHECK); 424 _the_null_string = OopHandle(vm_global(), s); 425 s = StringTable::intern("-2147483648", CHECK); 426 _the_min_jint_string = OopHandle(vm_global(), s); 427 428 429 #if INCLUDE_CDS 430 if (CDSConfig::is_using_archive()) { 431 // Verify shared interfaces array. 432 assert(_the_array_interfaces_array->at(0) == 433 vmClasses::Cloneable_klass(), "u3"); 434 assert(_the_array_interfaces_array->at(1) == 435 vmClasses::Serializable_klass(), "u3"); 436 437 } else 438 #endif 439 { 440 // Set up shared interfaces array. (Do this before supers are set up.) 441 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass()); 442 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass()); 443 } 444 445 if (UseSecondarySupersTable) { 446 Universe::_the_array_interfaces_bitmap = Klass::compute_secondary_supers_bitmap(_the_array_interfaces_array); 447 Universe::_the_empty_klass_bitmap = Klass::compute_secondary_supers_bitmap(_the_empty_klass_array); 448 } 449 450 initialize_basic_type_klass(_fillerArrayKlass, CHECK); 451 452 initialize_basic_type_klass(boolArrayKlass(), CHECK); 453 initialize_basic_type_klass(charArrayKlass(), CHECK); 454 initialize_basic_type_klass(floatArrayKlass(), CHECK); 455 initialize_basic_type_klass(doubleArrayKlass(), CHECK); 456 initialize_basic_type_klass(byteArrayKlass(), CHECK); 457 initialize_basic_type_klass(shortArrayKlass(), CHECK); 458 initialize_basic_type_klass(intArrayKlass(), CHECK); 459 initialize_basic_type_klass(longArrayKlass(), CHECK); 460 461 assert(_fillerArrayKlass != intArrayKlass(), 462 "Internal filler array klass should be different to int array Klass"); 463 } // end of core bootstrapping 464 465 { 466 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 467 _the_null_sentinel = OopHandle(vm_global(), tns()); 468 } 469 470 // Create a handle for reference_pending_list 471 _reference_pending_list = OopHandle(vm_global(), nullptr); 472 473 // Maybe this could be lifted up now that object array can be initialized 474 // during the bootstrapping. 475 476 // OLD 477 // Initialize _objectArrayKlass after core bootstraping to make 478 // sure the super class is set up properly for _objectArrayKlass. 479 // --- 480 // NEW 481 // Since some of the old system object arrays have been converted to 482 // ordinary object arrays, _objectArrayKlass will be loaded when 483 // SystemDictionary::initialize(CHECK); is run. See the extra check 484 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 485 { 486 Klass* oak = vmClasses::Object_klass()->array_klass(CHECK); 487 _objectArrayKlass = ObjArrayKlass::cast(oak); 488 } 489 // OLD 490 // Add the class to the class hierarchy manually to make sure that 491 // its vtable is initialized after core bootstrapping is completed. 492 // --- 493 // New 494 // Have already been initialized. 495 _objectArrayKlass->append_to_sibling_list(); 496 497 #ifdef ASSERT 498 if (FullGCALot) { 499 // Allocate an array of dummy objects. 500 // We'd like these to be at the bottom of the old generation, 501 // so that when we free one and then collect, 502 // (almost) the whole heap moves 503 // and we find out if we actually update all the oops correctly. 504 // But we can't allocate directly in the old generation, 505 // so we allocate wherever, and hope that the first collection 506 // moves these objects to the bottom of the old generation. 507 int size = FullGCALotDummies * 2; 508 509 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK); 510 objArrayHandle dummy_array(THREAD, naked_array); 511 int i = 0; 512 while (i < size) { 513 // Allocate dummy in old generation 514 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK); 515 dummy_array->obj_at_put(i++, dummy); 516 } 517 { 518 // Only modify the global variable inside the mutex. 519 // If we had a race to here, the other dummy_array instances 520 // and their elements just get dropped on the floor, which is fine. 521 MutexLocker ml(THREAD, FullGCALot_lock); 522 if (_fullgc_alot_dummy_array.is_empty()) { 523 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array()); 524 } 525 } 526 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking"); 527 } 528 #endif 529 } 530 531 void Universe::initialize_basic_type_mirrors(TRAPS) { 532 #if INCLUDE_CDS_JAVA_HEAP 533 if (CDSConfig::is_using_archive() && 534 ArchiveHeapLoader::is_in_use() && 535 _basic_type_mirrors[T_INT].resolve() != nullptr) { 536 assert(ArchiveHeapLoader::can_use(), "Sanity"); 537 538 // check that all basic type mirrors are mapped also 539 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 540 if (!is_reference_type((BasicType)i)) { 541 oop m = _basic_type_mirrors[i].resolve(); 542 assert(m != nullptr, "archived mirrors should not be null"); 543 } 544 } 545 } else 546 // _basic_type_mirrors[T_INT], etc, are null if archived heap is not mapped. 547 #endif 548 { 549 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 550 BasicType bt = (BasicType)i; 551 if (!is_reference_type(bt)) { 552 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK); 553 _basic_type_mirrors[i] = OopHandle(vm_global(), m); 554 } 555 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1); 556 } 557 } 558 if (CDSConfig::is_dumping_heap()) { 559 HeapShared::init_scratch_objects(CHECK); 560 } 561 } 562 563 void Universe::fixup_mirrors(TRAPS) { 564 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 565 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 566 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 567 // that the number of objects allocated at this point is very small. 568 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded"); 569 HandleMark hm(THREAD); 570 571 if (!CDSConfig::is_using_archive()) { 572 // Cache the start of the static fields 573 InstanceMirrorKlass::init_offset_of_static_fields(); 574 } 575 576 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 577 int list_length = list->length(); 578 for (int i = 0; i < list_length; i++) { 579 Klass* k = list->at(i); 580 assert(k->is_klass(), "List should only hold classes"); 581 java_lang_Class::fixup_mirror(k, CATCH); 582 } 583 delete java_lang_Class::fixup_mirror_list(); 584 java_lang_Class::set_fixup_mirror_list(nullptr); 585 } 586 587 #define assert_pll_locked(test) \ 588 assert(Heap_lock->test(), "Reference pending list access requires lock") 589 590 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 591 592 oop Universe::reference_pending_list() { 593 if (Thread::current()->is_VM_thread()) { 594 assert_pll_locked(is_locked); 595 } else { 596 assert_pll_ownership(); 597 } 598 return _reference_pending_list.resolve(); 599 } 600 601 void Universe::clear_reference_pending_list() { 602 assert_pll_ownership(); 603 _reference_pending_list.replace(nullptr); 604 } 605 606 bool Universe::has_reference_pending_list() { 607 assert_pll_ownership(); 608 return _reference_pending_list.peek() != nullptr; 609 } 610 611 oop Universe::swap_reference_pending_list(oop list) { 612 assert_pll_locked(is_locked); 613 return _reference_pending_list.xchg(list); 614 } 615 616 #undef assert_pll_locked 617 #undef assert_pll_ownership 618 619 static void reinitialize_vtables() { 620 // The vtables are initialized by starting at java.lang.Object and 621 // initializing through the subclass links, so that the super 622 // classes are always initialized first. 623 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) { 624 Klass* sub = iter.klass(); 625 sub->vtable().initialize_vtable(); 626 } 627 } 628 629 static void reinitialize_itables() { 630 631 class ReinitTableClosure : public KlassClosure { 632 public: 633 void do_klass(Klass* k) { 634 if (k->is_instance_klass()) { 635 InstanceKlass::cast(k)->itable().initialize_itable(); 636 } 637 } 638 }; 639 640 MutexLocker mcld(ClassLoaderDataGraph_lock); 641 ReinitTableClosure cl; 642 ClassLoaderDataGraph::classes_do(&cl); 643 } 644 645 bool Universe::on_page_boundary(void* addr) { 646 return is_aligned(addr, os::vm_page_size()); 647 } 648 649 // the array of preallocated errors with backtraces 650 objArrayOop Universe::preallocated_out_of_memory_errors() { 651 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve(); 652 } 653 654 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); } 655 656 oop Universe::out_of_memory_error_java_heap() { 657 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap)); 658 } 659 660 oop Universe::out_of_memory_error_java_heap_without_backtrace() { 661 return out_of_memory_errors()->obj_at(_oom_java_heap); 662 } 663 664 oop Universe::out_of_memory_error_c_heap() { 665 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap)); 666 } 667 668 oop Universe::out_of_memory_error_metaspace() { 669 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace)); 670 } 671 672 oop Universe::out_of_memory_error_class_metaspace() { 673 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace)); 674 } 675 676 oop Universe::out_of_memory_error_array_size() { 677 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size)); 678 } 679 680 oop Universe::out_of_memory_error_gc_overhead_limit() { 681 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit)); 682 } 683 684 oop Universe::out_of_memory_error_realloc_objects() { 685 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects)); 686 } 687 688 oop Universe::class_init_out_of_memory_error() { return out_of_memory_errors()->obj_at(_oom_java_heap); } 689 oop Universe::class_init_stack_overflow_error() { return _class_init_stack_overflow_error.resolve(); } 690 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); } 691 692 693 bool Universe::should_fill_in_stack_trace(Handle throwable) { 694 // never attempt to fill in the stack trace of preallocated errors that do not have 695 // backtrace. These errors are kept alive forever and may be "re-used" when all 696 // preallocated errors with backtrace have been consumed. Also need to avoid 697 // a potential loop which could happen if an out of memory occurs when attempting 698 // to allocate the backtrace. 699 objArrayOop preallocated_oom = out_of_memory_errors(); 700 for (int i = 0; i < _oom_count; i++) { 701 if (throwable() == preallocated_oom->obj_at(i)) { 702 return false; 703 } 704 } 705 return true; 706 } 707 708 709 oop Universe::gen_out_of_memory_error(oop default_err) { 710 // generate an out of memory error: 711 // - if there is a preallocated error and stack traces are available 712 // (j.l.Throwable is initialized), then return the preallocated 713 // error with a filled in stack trace, and with the message 714 // provided by the default error. 715 // - otherwise, return the default error, without a stack trace. 716 int next; 717 if ((_preallocated_out_of_memory_error_avail_count > 0) && 718 vmClasses::Throwable_klass()->is_initialized()) { 719 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1); 720 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 721 } else { 722 next = -1; 723 } 724 if (next < 0) { 725 // all preallocated errors have been used. 726 // return default 727 return default_err; 728 } else { 729 JavaThread* current = JavaThread::current(); 730 Handle default_err_h(current, default_err); 731 // get the error object at the slot and set set it to null so that the 732 // array isn't keeping it alive anymore. 733 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next)); 734 assert(exc() != nullptr, "slot has been used already"); 735 preallocated_out_of_memory_errors()->obj_at_put(next, nullptr); 736 737 // use the message from the default error 738 oop msg = java_lang_Throwable::message(default_err_h()); 739 assert(msg != nullptr, "no message"); 740 java_lang_Throwable::set_message(exc(), msg); 741 742 // populate the stack trace and return it. 743 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 744 return exc(); 745 } 746 } 747 748 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) { 749 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve(); 750 } 751 752 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) { 753 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve(); 754 } 755 756 // Setup preallocated OutOfMemoryError errors 757 void Universe::create_preallocated_out_of_memory_errors(TRAPS) { 758 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass(); 759 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK); 760 objArrayHandle oom_array(THREAD, oa); 761 762 for (int i = 0; i < _oom_count; i++) { 763 oop oom_obj = ik->allocate_instance(CHECK); 764 oom_array->obj_at_put(i, oom_obj); 765 } 766 _out_of_memory_errors = OopHandle(vm_global(), oom_array()); 767 768 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK); 769 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg()); 770 771 msg = java_lang_String::create_from_str("C heap space", CHECK); 772 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg()); 773 774 msg = java_lang_String::create_from_str("Metaspace", CHECK); 775 _msg_metaspace = OopHandle(vm_global(), msg()); 776 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg()); 777 778 msg = java_lang_String::create_from_str("Compressed class space", CHECK); 779 _msg_class_metaspace = OopHandle(vm_global(), msg()); 780 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg()); 781 782 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK); 783 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg()); 784 785 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK); 786 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg()); 787 788 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK); 789 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg()); 790 791 // Setup the array of errors that have preallocated backtrace 792 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 793 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK); 794 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance); 795 objArrayHandle preallocated_oom_array(THREAD, instance); 796 797 for (int i=0; i<len; i++) { 798 oop err = ik->allocate_instance(CHECK); 799 Handle err_h(THREAD, err); 800 java_lang_Throwable::allocate_backtrace(err_h, CHECK); 801 preallocated_oom_array->obj_at_put(i, err_h()); 802 } 803 _preallocated_out_of_memory_error_avail_count = (jint)len; 804 } 805 806 intptr_t Universe::_non_oop_bits = 0; 807 808 void* Universe::non_oop_word() { 809 // Neither the high bits nor the low bits of this value is allowed 810 // to look like (respectively) the high or low bits of a real oop. 811 // 812 // High and low are CPU-specific notions, but low always includes 813 // the low-order bit. Since oops are always aligned at least mod 4, 814 // setting the low-order bit will ensure that the low half of the 815 // word will never look like that of a real oop. 816 // 817 // Using the OS-supplied non-memory-address word (usually 0 or -1) 818 // will take care of the high bits, however many there are. 819 820 if (_non_oop_bits == 0) { 821 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 822 } 823 824 return (void*)_non_oop_bits; 825 } 826 827 bool Universe::contains_non_oop_word(void* p) { 828 return *(void**)p == non_oop_word(); 829 } 830 831 static void initialize_global_behaviours() { 832 DefaultICProtectionBehaviour* protection_behavior = new DefaultICProtectionBehaviour(); 833 // Ignore leak of DefaultICProtectionBehaviour. It is overriden by some GC implementations and the 834 // pointer is leaked once. 835 LSAN_IGNORE_OBJECT(protection_behavior); 836 CompiledICProtectionBehaviour::set_current(protection_behavior); 837 } 838 839 jint universe_init() { 840 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 841 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 842 "LogHeapWordSize is incorrect."); 843 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 844 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 845 "oop size is not not a multiple of HeapWord size"); 846 847 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 848 849 initialize_global_behaviours(); 850 851 GCLogPrecious::initialize(); 852 853 // Initialize CPUTimeCounters object, which must be done before creation of the heap. 854 CPUTimeCounters::initialize(); 855 856 #ifdef _LP64 857 MetaspaceShared::adjust_heap_sizes_for_dumping(); 858 #endif // _LP64 859 860 GCConfig::arguments()->initialize_heap_sizes(); 861 862 jint status = Universe::initialize_heap(); 863 if (status != JNI_OK) { 864 return status; 865 } 866 867 Universe::initialize_tlab(); 868 869 Metaspace::global_initialize(); 870 // Initialize performance counters for metaspaces 871 MetaspaceCounters::initialize_performance_counters(); 872 873 // Checks 'AfterMemoryInit' constraints. 874 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) { 875 return JNI_EINVAL; 876 } 877 878 ClassLoaderData::init_null_class_loader_data(); 879 880 #if INCLUDE_CDS 881 DynamicArchive::check_for_dynamic_dump(); 882 if (CDSConfig::is_using_archive()) { 883 // Read the data structures supporting the shared spaces (shared 884 // system dictionary, symbol table, etc.) 885 MetaspaceShared::initialize_shared_spaces(); 886 } 887 if (CDSConfig::is_dumping_archive()) { 888 MetaspaceShared::prepare_for_dumping(); 889 } 890 #endif 891 892 SymbolTable::create_table(); 893 StringTable::create_table(); 894 895 if (strlen(VerifySubSet) > 0) { 896 Universe::initialize_verify_flags(); 897 } 898 899 ResolvedMethodTable::create_table(); 900 901 return JNI_OK; 902 } 903 904 jint Universe::initialize_heap() { 905 assert(_collectedHeap == nullptr, "Heap already created"); 906 _collectedHeap = GCConfig::arguments()->create_heap(); 907 908 log_info(gc)("Using %s", _collectedHeap->name()); 909 return _collectedHeap->initialize(); 910 } 911 912 void Universe::initialize_tlab() { 913 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 914 PLAB::startup_initialization(); 915 if (UseTLAB) { 916 ThreadLocalAllocBuffer::startup_initialization(); 917 } 918 } 919 920 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 921 922 assert(alignment <= Arguments::conservative_max_heap_alignment(), 923 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 924 alignment, Arguments::conservative_max_heap_alignment()); 925 926 size_t total_reserved = align_up(heap_size, alignment); 927 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 928 "heap size is too big for compressed oops"); 929 930 size_t page_size = os::vm_page_size(); 931 if (UseLargePages && is_aligned(alignment, os::large_page_size())) { 932 page_size = os::large_page_size(); 933 } else { 934 // Parallel is the only collector that might opt out of using large pages 935 // for the heap. 936 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages"); 937 } 938 939 // Now create the space. 940 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt); 941 942 if (total_rs.is_reserved()) { 943 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 944 "must be exactly of required size and alignment"); 945 // We are good. 946 947 if (AllocateHeapAt != nullptr) { 948 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 949 } 950 951 if (UseCompressedOops) { 952 CompressedOops::initialize(total_rs); 953 } 954 955 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end()); 956 957 return total_rs; 958 } 959 960 vm_exit_during_initialization( 961 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 962 total_reserved/K)); 963 964 // satisfy compiler 965 ShouldNotReachHere(); 966 return ReservedHeapSpace(0, 0, os::vm_page_size()); 967 } 968 969 OopStorage* Universe::vm_weak() { 970 return Universe::_vm_weak; 971 } 972 973 OopStorage* Universe::vm_global() { 974 return Universe::_vm_global; 975 } 976 977 void Universe::oopstorage_init() { 978 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal); 979 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal); 980 } 981 982 void universe_oopstorage_init() { 983 Universe::oopstorage_init(); 984 } 985 986 void LatestMethodCache::init(JavaThread* current, InstanceKlass* ik, 987 const char* method, Symbol* signature, bool is_static) 988 { 989 TempNewSymbol name = SymbolTable::new_symbol(method); 990 Method* m = nullptr; 991 // The klass must be linked before looking up the method. 992 if (!ik->link_class_or_fail(current) || 993 ((m = ik->find_method(name, signature)) == nullptr) || 994 is_static != m->is_static()) { 995 ResourceMark rm(current); 996 // NoSuchMethodException doesn't actually work because it tries to run the 997 // <init> function before java_lang_Class is linked. Print error and exit. 998 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 999 ik->name()->as_C_string(), method)); 1000 } 1001 1002 _klass = ik; 1003 _method_idnum = m->method_idnum(); 1004 assert(_method_idnum >= 0, "sanity check"); 1005 } 1006 1007 Method* LatestMethodCache::get_method() { 1008 if (_klass == nullptr) { 1009 return nullptr; 1010 } else { 1011 Method* m = _klass->method_with_idnum(_method_idnum); 1012 assert(m != nullptr, "sanity check"); 1013 return m; 1014 } 1015 } 1016 1017 Method* Universe::finalizer_register_method() { return _finalizer_register_cache.get_method(); } 1018 Method* Universe::loader_addClass_method() { return _loader_addClass_cache.get_method(); } 1019 Method* Universe::throw_illegal_access_error() { return _throw_illegal_access_error_cache.get_method(); } 1020 Method* Universe::throw_no_such_method_error() { return _throw_no_such_method_error_cache.get_method(); } 1021 Method* Universe::do_stack_walk_method() { return _do_stack_walk_cache.get_method(); } 1022 Method* Universe::is_substitutable_method() { return _is_substitutable_cache.get_method(); } 1023 Method* Universe::value_object_hash_code_method() { return _value_object_hash_code_cache.get_method(); } 1024 1025 void Universe::initialize_known_methods(JavaThread* current) { 1026 // Set up static method for registering finalizers 1027 _finalizer_register_cache.init(current, 1028 vmClasses::Finalizer_klass(), 1029 "register", 1030 vmSymbols::object_void_signature(), true); 1031 1032 _throw_illegal_access_error_cache.init(current, 1033 vmClasses::internal_Unsafe_klass(), 1034 "throwIllegalAccessError", 1035 vmSymbols::void_method_signature(), true); 1036 1037 _throw_no_such_method_error_cache.init(current, 1038 vmClasses::internal_Unsafe_klass(), 1039 "throwNoSuchMethodError", 1040 vmSymbols::void_method_signature(), true); 1041 1042 // Set up method for registering loaded classes in class loader vector 1043 _loader_addClass_cache.init(current, 1044 vmClasses::ClassLoader_klass(), 1045 "addClass", 1046 vmSymbols::class_void_signature(), false); 1047 1048 // Set up method for stack walking 1049 _do_stack_walk_cache.init(current, 1050 vmClasses::AbstractStackWalker_klass(), 1051 "doStackWalk", 1052 vmSymbols::doStackWalk_signature(), false); 1053 1054 // Set up substitutability testing 1055 ResourceMark rm(current); 1056 _is_substitutable_cache.init(current, 1057 vmClasses::ValueObjectMethods_klass(), 1058 vmSymbols::isSubstitutable_name()->as_C_string(), 1059 vmSymbols::object_object_boolean_signature(), true); 1060 _value_object_hash_code_cache.init(current, 1061 vmClasses::ValueObjectMethods_klass(), 1062 vmSymbols::valueObjectHashCode_name()->as_C_string(), 1063 vmSymbols::object_int_signature(), true); 1064 } 1065 1066 void universe2_init() { 1067 EXCEPTION_MARK; 1068 Universe::genesis(CATCH); 1069 } 1070 1071 // Set after initialization of the module runtime, call_initModuleRuntime 1072 void universe_post_module_init() { 1073 Universe::_module_initialized = true; 1074 } 1075 1076 bool universe_post_init() { 1077 assert(!is_init_completed(), "Error: initialization not yet completed!"); 1078 Universe::_fully_initialized = true; 1079 EXCEPTION_MARK; 1080 if (!CDSConfig::is_using_archive()) { 1081 reinitialize_vtables(); 1082 reinitialize_itables(); 1083 } 1084 1085 HandleMark hm(THREAD); 1086 // Setup preallocated empty java.lang.Class array for Method reflection. 1087 1088 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false); 1089 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array); 1090 1091 // Setup preallocated OutOfMemoryError errors 1092 Universe::create_preallocated_out_of_memory_errors(CHECK_false); 1093 1094 oop instance; 1095 // Setup preallocated cause message for delayed StackOverflowError 1096 if (StackReservedPages > 0) { 1097 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1098 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance); 1099 } 1100 1101 // Setup preallocated NullPointerException/ArithmeticException 1102 // (used for a cheap & dirty solution in compiler exception handling) 1103 _null_ptr_exception.init_if_empty(vmSymbols::java_lang_NullPointerException(), CHECK_false); 1104 _arithmetic_exception.init_if_empty(vmSymbols::java_lang_ArithmeticException(), CHECK_false); 1105 1106 // Virtual Machine Error for when we get into a situation we can't resolve 1107 Klass* k = vmClasses::InternalError_klass(); 1108 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1109 if (!linked) { 1110 tty->print_cr("Unable to link/verify InternalError class"); 1111 return false; // initialization failed 1112 } 1113 _internal_error.init_if_empty(vmSymbols::java_lang_InternalError(), CHECK_false); 1114 1115 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1116 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg()); 1117 1118 // Setup preallocated StackOverflowError for use with class initialization failure 1119 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackOverflowError(), true, CHECK_false); 1120 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1121 Universe::_class_init_stack_overflow_error = OopHandle(Universe::vm_global(), instance); 1122 1123 Universe::initialize_known_methods(THREAD); 1124 1125 // This needs to be done before the first scavenge/gc, since 1126 // it's an input to soft ref clearing policy. 1127 { 1128 MutexLocker x(THREAD, Heap_lock); 1129 Universe::heap()->update_capacity_and_used_at_gc(); 1130 } 1131 1132 // ("weak") refs processing infrastructure initialization 1133 Universe::heap()->post_initialize(); 1134 1135 MemoryService::add_metaspace_memory_pools(); 1136 1137 MemoryService::set_universe_heap(Universe::heap()); 1138 #if INCLUDE_CDS 1139 MetaspaceShared::post_initialize(CHECK_false); 1140 #endif 1141 return true; 1142 } 1143 1144 1145 void Universe::compute_base_vtable_size() { 1146 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1147 } 1148 1149 void Universe::print_on(outputStream* st) { 1150 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1151 st->print_cr("Heap"); 1152 heap()->print_on(st); 1153 } 1154 1155 void Universe::print_heap_at_SIGBREAK() { 1156 if (PrintHeapAtSIGBREAK) { 1157 print_on(tty); 1158 tty->cr(); 1159 tty->flush(); 1160 } 1161 } 1162 1163 void Universe::initialize_verify_flags() { 1164 verify_flags = 0; 1165 const char delimiter[] = " ,"; 1166 1167 size_t length = strlen(VerifySubSet); 1168 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1169 strncpy(subset_list, VerifySubSet, length + 1); 1170 char* save_ptr; 1171 1172 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1173 while (token != nullptr) { 1174 if (strcmp(token, "threads") == 0) { 1175 verify_flags |= Verify_Threads; 1176 } else if (strcmp(token, "heap") == 0) { 1177 verify_flags |= Verify_Heap; 1178 } else if (strcmp(token, "symbol_table") == 0) { 1179 verify_flags |= Verify_SymbolTable; 1180 } else if (strcmp(token, "string_table") == 0) { 1181 verify_flags |= Verify_StringTable; 1182 } else if (strcmp(token, "codecache") == 0) { 1183 verify_flags |= Verify_CodeCache; 1184 } else if (strcmp(token, "dictionary") == 0) { 1185 verify_flags |= Verify_SystemDictionary; 1186 } else if (strcmp(token, "classloader_data_graph") == 0) { 1187 verify_flags |= Verify_ClassLoaderDataGraph; 1188 } else if (strcmp(token, "metaspace") == 0) { 1189 verify_flags |= Verify_MetaspaceUtils; 1190 } else if (strcmp(token, "jni_handles") == 0) { 1191 verify_flags |= Verify_JNIHandles; 1192 } else if (strcmp(token, "codecache_oops") == 0) { 1193 verify_flags |= Verify_CodeCacheOops; 1194 } else if (strcmp(token, "resolved_method_table") == 0) { 1195 verify_flags |= Verify_ResolvedMethodTable; 1196 } else if (strcmp(token, "stringdedup") == 0) { 1197 verify_flags |= Verify_StringDedup; 1198 } else { 1199 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1200 } 1201 token = strtok_r(nullptr, delimiter, &save_ptr); 1202 } 1203 FREE_C_HEAP_ARRAY(char, subset_list); 1204 } 1205 1206 bool Universe::should_verify_subset(uint subset) { 1207 if (verify_flags & subset) { 1208 return true; 1209 } 1210 return false; 1211 } 1212 1213 void Universe::verify(VerifyOption option, const char* prefix) { 1214 COMPILER2_PRESENT( 1215 assert(!DerivedPointerTable::is_active(), 1216 "DPT should not be active during verification " 1217 "(of thread stacks below)"); 1218 ) 1219 1220 Thread* thread = Thread::current(); 1221 ResourceMark rm(thread); 1222 HandleMark hm(thread); // Handles created during verification can be zapped 1223 _verify_count++; 1224 1225 FormatBuffer<> title("Verifying %s", prefix); 1226 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1227 if (should_verify_subset(Verify_Threads)) { 1228 log_debug(gc, verify)("Threads"); 1229 Threads::verify(); 1230 } 1231 if (should_verify_subset(Verify_Heap)) { 1232 log_debug(gc, verify)("Heap"); 1233 heap()->verify(option); 1234 } 1235 if (should_verify_subset(Verify_SymbolTable)) { 1236 log_debug(gc, verify)("SymbolTable"); 1237 SymbolTable::verify(); 1238 } 1239 if (should_verify_subset(Verify_StringTable)) { 1240 log_debug(gc, verify)("StringTable"); 1241 StringTable::verify(); 1242 } 1243 if (should_verify_subset(Verify_CodeCache)) { 1244 log_debug(gc, verify)("CodeCache"); 1245 CodeCache::verify(); 1246 } 1247 if (should_verify_subset(Verify_SystemDictionary)) { 1248 log_debug(gc, verify)("SystemDictionary"); 1249 SystemDictionary::verify(); 1250 } 1251 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1252 log_debug(gc, verify)("ClassLoaderDataGraph"); 1253 ClassLoaderDataGraph::verify(); 1254 } 1255 if (should_verify_subset(Verify_MetaspaceUtils)) { 1256 log_debug(gc, verify)("MetaspaceUtils"); 1257 DEBUG_ONLY(MetaspaceUtils::verify();) 1258 } 1259 if (should_verify_subset(Verify_JNIHandles)) { 1260 log_debug(gc, verify)("JNIHandles"); 1261 JNIHandles::verify(); 1262 } 1263 if (should_verify_subset(Verify_CodeCacheOops)) { 1264 log_debug(gc, verify)("CodeCache Oops"); 1265 CodeCache::verify_oops(); 1266 } 1267 if (should_verify_subset(Verify_ResolvedMethodTable)) { 1268 log_debug(gc, verify)("ResolvedMethodTable Oops"); 1269 ResolvedMethodTable::verify(); 1270 } 1271 if (should_verify_subset(Verify_StringDedup)) { 1272 log_debug(gc, verify)("String Deduplication"); 1273 StringDedup::verify(); 1274 } 1275 } 1276 1277 1278 #ifndef PRODUCT 1279 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1280 assert(low_boundary < high_boundary, "bad interval"); 1281 1282 // decide which low-order bits we require to be clear: 1283 size_t alignSize = MinObjAlignmentInBytes; 1284 size_t min_object_size = CollectedHeap::min_fill_size(); 1285 1286 // make an inclusive limit: 1287 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1288 uintptr_t min = (uintptr_t)low_boundary; 1289 assert(min < max, "bad interval"); 1290 uintptr_t diff = max ^ min; 1291 1292 // throw away enough low-order bits to make the diff vanish 1293 uintptr_t mask = (uintptr_t)(-1); 1294 while ((mask & diff) != 0) 1295 mask <<= 1; 1296 uintptr_t bits = (min & mask); 1297 assert(bits == (max & mask), "correct mask"); 1298 // check an intermediate value between min and max, just to make sure: 1299 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1300 1301 // require address alignment, too: 1302 mask |= (alignSize - 1); 1303 1304 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1305 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1306 } 1307 _verify_oop_mask = mask; 1308 _verify_oop_bits = bits; 1309 } 1310 1311 void Universe::set_verify_data(uintptr_t mask, uintptr_t bits) { 1312 _verify_oop_mask = mask; 1313 _verify_oop_bits = bits; 1314 } 1315 1316 // Oop verification (see MacroAssembler::verify_oop) 1317 1318 uintptr_t Universe::verify_oop_mask() { 1319 return _verify_oop_mask; 1320 } 1321 1322 uintptr_t Universe::verify_oop_bits() { 1323 return _verify_oop_bits; 1324 } 1325 1326 uintptr_t Universe::verify_mark_mask() { 1327 return markWord::lock_mask_in_place; 1328 } 1329 1330 uintptr_t Universe::verify_mark_bits() { 1331 intptr_t mask = verify_mark_mask(); 1332 intptr_t bits = (intptr_t)markWord::prototype().value(); 1333 assert((bits & ~mask) == 0, "no stray header bits"); 1334 return bits; 1335 } 1336 #endif // PRODUCT 1337 1338 #ifdef ASSERT 1339 // Release dummy object(s) at bottom of heap 1340 bool Universe::release_fullgc_alot_dummy() { 1341 MutexLocker ml(FullGCALot_lock); 1342 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve(); 1343 if (fullgc_alot_dummy_array != nullptr) { 1344 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) { 1345 // No more dummies to release, release entire array instead 1346 _fullgc_alot_dummy_array.release(Universe::vm_global()); 1347 _fullgc_alot_dummy_array = OopHandle(); // null out OopStorage pointer. 1348 return false; 1349 } 1350 1351 // Release dummy at bottom of old generation 1352 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, nullptr); 1353 } 1354 return true; 1355 } 1356 1357 bool Universe::is_stw_gc_active() { 1358 return heap()->is_stw_gc_active(); 1359 } 1360 1361 bool Universe::is_in_heap(const void* p) { 1362 return heap()->is_in(p); 1363 } 1364 1365 #endif // ASSERT