1 /* 2 * Copyright (c) 1997, 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/archiveHeapLoader.hpp" 26 #include "cds/cdsConfig.hpp" 27 #include "cds/dynamicArchive.hpp" 28 #include "cds/heapShared.hpp" 29 #include "cds/metaspaceShared.hpp" 30 #include "classfile/classLoader.hpp" 31 #include "classfile/classLoaderDataGraph.hpp" 32 #include "classfile/javaClasses.hpp" 33 #include "classfile/stringTable.hpp" 34 #include "classfile/symbolTable.hpp" 35 #include "classfile/systemDictionary.hpp" 36 #include "classfile/vmClasses.hpp" 37 #include "classfile/vmSymbols.hpp" 38 #include "code/codeBehaviours.hpp" 39 #include "code/codeCache.hpp" 40 #include "compiler/oopMap.hpp" 41 #include "gc/shared/collectedHeap.inline.hpp" 42 #include "gc/shared/gcArguments.hpp" 43 #include "gc/shared/gcConfig.hpp" 44 #include "gc/shared/gcLogPrecious.hpp" 45 #include "gc/shared/gcTraceTime.inline.hpp" 46 #include "gc/shared/oopStorageSet.hpp" 47 #include "gc/shared/plab.hpp" 48 #include "gc/shared/stringdedup/stringDedup.hpp" 49 #include "gc/shared/tlab_globals.hpp" 50 #include "logging/log.hpp" 51 #include "logging/logStream.hpp" 52 #include "memory/memoryReserver.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/jmethodIDTable.hpp" 64 #include "oops/klass.inline.hpp" 65 #include "oops/objArrayOop.inline.hpp" 66 #include "oops/objLayout.hpp" 67 #include "oops/oop.inline.hpp" 68 #include "oops/oopHandle.inline.hpp" 69 #include "oops/typeArrayKlass.hpp" 70 #include "prims/resolvedMethodTable.hpp" 71 #include "runtime/arguments.hpp" 72 #include "runtime/atomic.hpp" 73 #include "runtime/cpuTimeCounters.hpp" 74 #include "runtime/flags/jvmFlagLimit.hpp" 75 #include "runtime/handles.inline.hpp" 76 #include "runtime/init.hpp" 77 #include "runtime/java.hpp" 78 #include "runtime/javaThread.hpp" 79 #include "runtime/jniHandles.hpp" 80 #include "runtime/threads.hpp" 81 #include "runtime/timerTrace.hpp" 82 #include "sanitizers/leak.hpp" 83 #include "services/memoryService.hpp" 84 #include "utilities/align.hpp" 85 #include "utilities/autoRestore.hpp" 86 #include "utilities/debug.hpp" 87 #include "utilities/formatBuffer.hpp" 88 #include "utilities/macros.hpp" 89 #include "utilities/ostream.hpp" 90 #include "utilities/preserveException.hpp" 91 92 // A helper class for caching a Method* when the user of the cache 93 // only cares about the latest version of the Method*. This cache safely 94 // interacts with the RedefineClasses API. 95 class LatestMethodCache { 96 // We save the InstanceKlass* and the idnum of Method* in order to get 97 // the current Method*. 98 InstanceKlass* _klass; 99 int _method_idnum; 100 101 public: 102 LatestMethodCache() { _klass = nullptr; _method_idnum = -1; } 103 104 void init(JavaThread* current, InstanceKlass* ik, const char* method, 105 Symbol* signature, bool is_static); 106 Method* get_method(); 107 }; 108 109 static LatestMethodCache _finalizer_register_cache; // Finalizer.register() 110 static LatestMethodCache _loader_addClass_cache; // ClassLoader.addClass() 111 static LatestMethodCache _throw_illegal_access_error_cache; // Unsafe.throwIllegalAccessError() 112 static LatestMethodCache _throw_no_such_method_error_cache; // Unsafe.throwNoSuchMethodError() 113 static LatestMethodCache _do_stack_walk_cache; // AbstractStackWalker.doStackWalk() 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 static BuiltinException _array_index_out_of_bounds_exception; 235 static BuiltinException _array_store_exception; 236 static BuiltinException _class_cast_exception; 237 238 objArrayOop Universe::the_empty_class_array () { 239 return (objArrayOop)_the_empty_class_array.resolve(); 240 } 241 242 oop Universe::main_thread_group() { return _main_thread_group.resolve(); } 243 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); } 244 245 oop Universe::system_thread_group() { return _system_thread_group.resolve(); } 246 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); } 247 248 oop Universe::the_null_string() { return _the_null_string.resolve(); } 249 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); } 250 251 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception.instance(); } 252 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception.instance(); } 253 oop Universe::internal_error_instance() { return _internal_error.instance(); } 254 oop Universe::array_index_out_of_bounds_exception_instance() { return _array_index_out_of_bounds_exception.instance(); } 255 oop Universe::array_store_exception_instance() { return _array_store_exception.instance(); } 256 oop Universe::class_cast_exception_instance() { return _class_cast_exception.instance(); } 257 258 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); } 259 260 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); } 261 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); } 262 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); } 263 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); } 264 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); } 265 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); } 266 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); } 267 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); } 268 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); } 269 270 oop Universe::java_mirror(BasicType t) { 271 assert((uint)t < T_VOID+1, "range check"); 272 assert(!is_reference_type(t), "sanity"); 273 return check_mirror(_basic_type_mirrors[t].resolve()); 274 } 275 276 void Universe::basic_type_classes_do(KlassClosure *closure) { 277 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 278 closure->do_klass(_typeArrayKlasses[i]); 279 } 280 // We don't do the following because it will confuse JVMTI. 281 // _fillerArrayKlass is used only by GC, which doesn't need to see 282 // this klass from basic_type_classes_do(). 283 // 284 // closure->do_klass(_fillerArrayKlass); 285 } 286 287 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 288 it->push(&_fillerArrayKlass); 289 for (int i = 0; i < T_LONG+1; i++) { 290 it->push(&_typeArrayKlasses[i]); 291 } 292 it->push(&_objectArrayKlass); 293 294 it->push(&_the_empty_int_array); 295 it->push(&_the_empty_short_array); 296 it->push(&_the_empty_klass_array); 297 it->push(&_the_empty_instance_klass_array); 298 it->push(&_the_empty_method_array); 299 it->push(&_the_array_interfaces_array); 300 } 301 302 #if INCLUDE_CDS_JAVA_HEAP 303 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) { 304 assert(CDSConfig::is_dumping_heap(), "sanity"); 305 assert(!is_reference_type(t), "sanity"); 306 _archived_basic_type_mirror_indices[t] = index; 307 } 308 309 void Universe::archive_exception_instances() { 310 _null_ptr_exception.store_in_cds(); 311 _arithmetic_exception.store_in_cds(); 312 _internal_error.store_in_cds(); 313 _array_index_out_of_bounds_exception.store_in_cds(); 314 _array_store_exception.store_in_cds(); 315 _class_cast_exception.store_in_cds(); 316 } 317 318 void Universe::load_archived_object_instances() { 319 if (ArchiveHeapLoader::is_in_use()) { 320 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 321 int index = _archived_basic_type_mirror_indices[i]; 322 if (!is_reference_type((BasicType)i) && index >= 0) { 323 oop mirror_oop = HeapShared::get_root(index); 324 assert(mirror_oop != nullptr, "must be"); 325 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop); 326 } 327 } 328 329 _null_ptr_exception.load_from_cds(); 330 _arithmetic_exception.load_from_cds(); 331 _internal_error.load_from_cds(); 332 _array_index_out_of_bounds_exception.load_from_cds(); 333 _array_store_exception.load_from_cds(); 334 _class_cast_exception.load_from_cds(); 335 } 336 } 337 #endif 338 339 void Universe::serialize(SerializeClosure* f) { 340 341 #if INCLUDE_CDS_JAVA_HEAP 342 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 343 f->do_int(&_archived_basic_type_mirror_indices[i]); 344 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap 345 // contents may need to be relocated. _basic_type_mirrors[i] will be 346 // updated later in Universe::load_archived_object_instances(). 347 } 348 _null_ptr_exception.serialize(f); 349 _arithmetic_exception.serialize(f); 350 _internal_error.serialize(f); 351 _array_index_out_of_bounds_exception.serialize(f); 352 _array_store_exception.serialize(f); 353 _class_cast_exception.serialize(f); 354 #endif 355 356 f->do_ptr(&_fillerArrayKlass); 357 for (int i = 0; i < T_LONG+1; i++) { 358 f->do_ptr(&_typeArrayKlasses[i]); 359 } 360 361 f->do_ptr(&_objectArrayKlass); 362 f->do_ptr(&_the_array_interfaces_array); 363 f->do_ptr(&_the_empty_int_array); 364 f->do_ptr(&_the_empty_short_array); 365 f->do_ptr(&_the_empty_method_array); 366 f->do_ptr(&_the_empty_klass_array); 367 f->do_ptr(&_the_empty_instance_klass_array); 368 } 369 370 371 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 372 if (size < alignment || size % alignment != 0) { 373 vm_exit_during_initialization( 374 err_msg("Size of %s (%zu bytes) must be aligned to %zu bytes", name, size, alignment)); 375 } 376 } 377 378 static void initialize_basic_type_klass(Klass* k, TRAPS) { 379 Klass* ok = vmClasses::Object_klass(); 380 #if INCLUDE_CDS 381 if (CDSConfig::is_using_archive()) { 382 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 383 assert(k->super() == ok, "u3"); 384 if (k->is_instance_klass()) { 385 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), nullptr, CHECK); 386 } else { 387 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK); 388 } 389 } else 390 #endif 391 { 392 k->initialize_supers(ok, nullptr, CHECK); 393 } 394 k->append_to_sibling_list(); 395 } 396 397 void Universe::genesis(TRAPS) { 398 ResourceMark rm(THREAD); 399 HandleMark hm(THREAD); 400 401 // Explicit null checks are needed if these offsets are not smaller than the page size 402 if (UseCompactObjectHeaders) { 403 assert(oopDesc::mark_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()), 404 "Mark offset is expected to be less than the page size"); 405 } else { 406 assert(oopDesc::klass_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()), 407 "Klass offset is expected to be less than the page size"); 408 } 409 assert(arrayOopDesc::length_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()), 410 "Array length offset is expected to be less than the page size"); 411 412 { AutoModifyRestore<bool> temporarily(_bootstrapping, true); 413 414 java_lang_Class::allocate_fixup_lists(); 415 416 // determine base vtable size; without that we cannot create the array klasses 417 compute_base_vtable_size(); 418 419 if (!CDSConfig::is_using_archive()) { 420 // Initialization of the fillerArrayKlass must come before regular 421 // int-TypeArrayKlass so that the int-Array mirror points to the 422 // int-TypeArrayKlass. 423 _fillerArrayKlass = TypeArrayKlass::create_klass(T_INT, "[Ljdk/internal/vm/FillerElement;", CHECK); 424 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 425 _typeArrayKlasses[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 426 } 427 428 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 429 430 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, nullptr, CHECK); 431 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 432 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 433 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 434 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 435 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 436 } 437 438 vmSymbols::initialize(); 439 440 // Initialize table for matching jmethodID, before SystemDictionary. 441 JmethodIDTable::initialize(); 442 443 SystemDictionary::initialize(CHECK); 444 445 // Create string constants 446 oop s = StringTable::intern("null", CHECK); 447 _the_null_string = OopHandle(vm_global(), s); 448 s = StringTable::intern("-2147483648", CHECK); 449 _the_min_jint_string = OopHandle(vm_global(), s); 450 451 #if INCLUDE_CDS 452 if (CDSConfig::is_using_archive()) { 453 // Verify shared interfaces array. 454 assert(_the_array_interfaces_array->at(0) == 455 vmClasses::Cloneable_klass(), "u3"); 456 assert(_the_array_interfaces_array->at(1) == 457 vmClasses::Serializable_klass(), "u3"); 458 } else 459 #endif 460 { 461 // Set up shared interfaces array. (Do this before supers are set up.) 462 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass()); 463 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass()); 464 } 465 466 _the_array_interfaces_bitmap = Klass::compute_secondary_supers_bitmap(_the_array_interfaces_array); 467 _the_empty_klass_bitmap = Klass::compute_secondary_supers_bitmap(_the_empty_klass_array); 468 469 initialize_basic_type_klass(_fillerArrayKlass, CHECK); 470 471 initialize_basic_type_klass(boolArrayKlass(), CHECK); 472 initialize_basic_type_klass(charArrayKlass(), CHECK); 473 initialize_basic_type_klass(floatArrayKlass(), CHECK); 474 initialize_basic_type_klass(doubleArrayKlass(), CHECK); 475 initialize_basic_type_klass(byteArrayKlass(), CHECK); 476 initialize_basic_type_klass(shortArrayKlass(), CHECK); 477 initialize_basic_type_klass(intArrayKlass(), CHECK); 478 initialize_basic_type_klass(longArrayKlass(), CHECK); 479 480 assert(_fillerArrayKlass != intArrayKlass(), 481 "Internal filler array klass should be different to int array Klass"); 482 } // end of core bootstrapping 483 484 { 485 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 486 _the_null_sentinel = OopHandle(vm_global(), tns()); 487 } 488 489 // Create a handle for reference_pending_list 490 _reference_pending_list = OopHandle(vm_global(), nullptr); 491 492 // Maybe this could be lifted up now that object array can be initialized 493 // during the bootstrapping. 494 495 // OLD 496 // Initialize _objectArrayKlass after core bootstraping to make 497 // sure the super class is set up properly for _objectArrayKlass. 498 // --- 499 // NEW 500 // Since some of the old system object arrays have been converted to 501 // ordinary object arrays, _objectArrayKlass will be loaded when 502 // SystemDictionary::initialize(CHECK); is run. See the extra check 503 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 504 { 505 Klass* oak = vmClasses::Object_klass()->array_klass(CHECK); 506 _objectArrayKlass = ObjArrayKlass::cast(oak); 507 } 508 // OLD 509 // Add the class to the class hierarchy manually to make sure that 510 // its vtable is initialized after core bootstrapping is completed. 511 // --- 512 // New 513 // Have already been initialized. 514 _objectArrayKlass->append_to_sibling_list(); 515 516 #ifdef ASSERT 517 if (FullGCALot) { 518 // Allocate an array of dummy objects. 519 // We'd like these to be at the bottom of the old generation, 520 // so that when we free one and then collect, 521 // (almost) the whole heap moves 522 // and we find out if we actually update all the oops correctly. 523 // But we can't allocate directly in the old generation, 524 // so we allocate wherever, and hope that the first collection 525 // moves these objects to the bottom of the old generation. 526 int size = FullGCALotDummies * 2; 527 528 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK); 529 objArrayHandle dummy_array(THREAD, naked_array); 530 int i = 0; 531 while (i < size) { 532 // Allocate dummy in old generation 533 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK); 534 dummy_array->obj_at_put(i++, dummy); 535 } 536 { 537 // Only modify the global variable inside the mutex. 538 // If we had a race to here, the other dummy_array instances 539 // and their elements just get dropped on the floor, which is fine. 540 MutexLocker ml(THREAD, FullGCALot_lock); 541 if (_fullgc_alot_dummy_array.is_empty()) { 542 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array()); 543 } 544 } 545 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking"); 546 } 547 #endif 548 } 549 550 void Universe::initialize_basic_type_mirrors(TRAPS) { 551 #if INCLUDE_CDS_JAVA_HEAP 552 if (CDSConfig::is_using_archive() && 553 ArchiveHeapLoader::is_in_use() && 554 _basic_type_mirrors[T_INT].resolve() != nullptr) { 555 assert(ArchiveHeapLoader::can_use(), "Sanity"); 556 557 // check that all basic type mirrors are mapped also 558 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 559 if (!is_reference_type((BasicType)i)) { 560 oop m = _basic_type_mirrors[i].resolve(); 561 assert(m != nullptr, "archived mirrors should not be null"); 562 } 563 } 564 } else 565 // _basic_type_mirrors[T_INT], etc, are null if archived heap is not mapped. 566 #endif 567 { 568 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 569 BasicType bt = (BasicType)i; 570 if (!is_reference_type(bt)) { 571 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK); 572 _basic_type_mirrors[i] = OopHandle(vm_global(), m); 573 } 574 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1); 575 } 576 } 577 if (CDSConfig::is_dumping_heap()) { 578 HeapShared::init_scratch_objects_for_basic_type_mirrors(CHECK); 579 } 580 } 581 582 void Universe::fixup_mirrors(TRAPS) { 583 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 584 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 585 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 586 // that the number of objects allocated at this point is very small. 587 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded"); 588 HandleMark hm(THREAD); 589 590 if (!CDSConfig::is_using_archive()) { 591 // Cache the start of the static fields 592 InstanceMirrorKlass::init_offset_of_static_fields(); 593 } 594 595 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 596 int list_length = list->length(); 597 for (int i = 0; i < list_length; i++) { 598 Klass* k = list->at(i); 599 assert(k->is_klass(), "List should only hold classes"); 600 java_lang_Class::fixup_mirror(k, CATCH); 601 } 602 delete java_lang_Class::fixup_mirror_list(); 603 java_lang_Class::set_fixup_mirror_list(nullptr); 604 } 605 606 #define assert_pll_locked(test) \ 607 assert(Heap_lock->test(), "Reference pending list access requires lock") 608 609 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 610 611 oop Universe::reference_pending_list() { 612 if (Thread::current()->is_VM_thread()) { 613 assert_pll_locked(is_locked); 614 } else { 615 assert_pll_ownership(); 616 } 617 return _reference_pending_list.resolve(); 618 } 619 620 void Universe::clear_reference_pending_list() { 621 assert_pll_ownership(); 622 _reference_pending_list.replace(nullptr); 623 } 624 625 bool Universe::has_reference_pending_list() { 626 assert_pll_ownership(); 627 return _reference_pending_list.peek() != nullptr; 628 } 629 630 oop Universe::swap_reference_pending_list(oop list) { 631 assert_pll_locked(is_locked); 632 return _reference_pending_list.xchg(list); 633 } 634 635 #undef assert_pll_locked 636 #undef assert_pll_ownership 637 638 static void reinitialize_vtables() { 639 // The vtables are initialized by starting at java.lang.Object and 640 // initializing through the subclass links, so that the super 641 // classes are always initialized first. 642 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) { 643 Klass* sub = iter.klass(); 644 sub->vtable().initialize_vtable(); 645 } 646 } 647 648 static void reinitialize_itables() { 649 650 class ReinitTableClosure : public KlassClosure { 651 public: 652 void do_klass(Klass* k) { 653 if (k->is_instance_klass()) { 654 InstanceKlass::cast(k)->itable().initialize_itable(); 655 } 656 } 657 }; 658 659 MutexLocker mcld(ClassLoaderDataGraph_lock); 660 ReinitTableClosure cl; 661 ClassLoaderDataGraph::classes_do(&cl); 662 } 663 664 bool Universe::on_page_boundary(void* addr) { 665 return is_aligned(addr, os::vm_page_size()); 666 } 667 668 // the array of preallocated errors with backtraces 669 objArrayOop Universe::preallocated_out_of_memory_errors() { 670 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve(); 671 } 672 673 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); } 674 675 oop Universe::out_of_memory_error_java_heap() { 676 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap)); 677 } 678 679 oop Universe::out_of_memory_error_java_heap_without_backtrace() { 680 return out_of_memory_errors()->obj_at(_oom_java_heap); 681 } 682 683 oop Universe::out_of_memory_error_c_heap() { 684 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap)); 685 } 686 687 oop Universe::out_of_memory_error_metaspace() { 688 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace)); 689 } 690 691 oop Universe::out_of_memory_error_class_metaspace() { 692 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace)); 693 } 694 695 oop Universe::out_of_memory_error_array_size() { 696 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size)); 697 } 698 699 oop Universe::out_of_memory_error_gc_overhead_limit() { 700 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit)); 701 } 702 703 oop Universe::out_of_memory_error_realloc_objects() { 704 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects)); 705 } 706 707 oop Universe::class_init_out_of_memory_error() { return out_of_memory_errors()->obj_at(_oom_java_heap); } 708 oop Universe::class_init_stack_overflow_error() { return _class_init_stack_overflow_error.resolve(); } 709 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); } 710 711 712 bool Universe::should_fill_in_stack_trace(Handle throwable) { 713 // never attempt to fill in the stack trace of preallocated errors that do not have 714 // backtrace. These errors are kept alive forever and may be "re-used" when all 715 // preallocated errors with backtrace have been consumed. Also need to avoid 716 // a potential loop which could happen if an out of memory occurs when attempting 717 // to allocate the backtrace. 718 objArrayOop preallocated_oom = out_of_memory_errors(); 719 for (int i = 0; i < _oom_count; i++) { 720 if (throwable() == preallocated_oom->obj_at(i)) { 721 return false; 722 } 723 } 724 return true; 725 } 726 727 728 oop Universe::gen_out_of_memory_error(oop default_err) { 729 // generate an out of memory error: 730 // - if there is a preallocated error and stack traces are available 731 // (j.l.Throwable is initialized), then return the preallocated 732 // error with a filled in stack trace, and with the message 733 // provided by the default error. 734 // - otherwise, return the default error, without a stack trace. 735 int next; 736 if ((_preallocated_out_of_memory_error_avail_count > 0) && 737 vmClasses::Throwable_klass()->is_initialized()) { 738 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1); 739 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 740 } else { 741 next = -1; 742 } 743 if (next < 0) { 744 // all preallocated errors have been used. 745 // return default 746 return default_err; 747 } else { 748 JavaThread* current = JavaThread::current(); 749 Handle default_err_h(current, default_err); 750 // get the error object at the slot and set set it to null so that the 751 // array isn't keeping it alive anymore. 752 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next)); 753 assert(exc() != nullptr, "slot has been used already"); 754 preallocated_out_of_memory_errors()->obj_at_put(next, nullptr); 755 756 // use the message from the default error 757 oop msg = java_lang_Throwable::message(default_err_h()); 758 assert(msg != nullptr, "no message"); 759 java_lang_Throwable::set_message(exc(), msg); 760 761 // populate the stack trace and return it. 762 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 763 return exc(); 764 } 765 } 766 767 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) { 768 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve(); 769 } 770 771 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) { 772 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve(); 773 } 774 775 // Setup preallocated OutOfMemoryError errors 776 void Universe::create_preallocated_out_of_memory_errors(TRAPS) { 777 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass(); 778 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK); 779 objArrayHandle oom_array(THREAD, oa); 780 781 for (int i = 0; i < _oom_count; i++) { 782 oop oom_obj = ik->allocate_instance(CHECK); 783 oom_array->obj_at_put(i, oom_obj); 784 } 785 _out_of_memory_errors = OopHandle(vm_global(), oom_array()); 786 787 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK); 788 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg()); 789 790 msg = java_lang_String::create_from_str("C heap space", CHECK); 791 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg()); 792 793 msg = java_lang_String::create_from_str("Metaspace", CHECK); 794 _msg_metaspace = OopHandle(vm_global(), msg()); 795 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg()); 796 797 msg = java_lang_String::create_from_str("Compressed class space", CHECK); 798 _msg_class_metaspace = OopHandle(vm_global(), msg()); 799 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg()); 800 801 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK); 802 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg()); 803 804 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK); 805 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg()); 806 807 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK); 808 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg()); 809 810 // Setup the array of errors that have preallocated backtrace 811 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 812 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK); 813 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance); 814 objArrayHandle preallocated_oom_array(THREAD, instance); 815 816 for (int i=0; i<len; i++) { 817 oop err = ik->allocate_instance(CHECK); 818 Handle err_h(THREAD, err); 819 java_lang_Throwable::allocate_backtrace(err_h, CHECK); 820 preallocated_oom_array->obj_at_put(i, err_h()); 821 } 822 _preallocated_out_of_memory_error_avail_count = (jint)len; 823 } 824 825 intptr_t Universe::_non_oop_bits = 0; 826 827 void* Universe::non_oop_word() { 828 // Neither the high bits nor the low bits of this value is allowed 829 // to look like (respectively) the high or low bits of a real oop. 830 // 831 // High and low are CPU-specific notions, but low always includes 832 // the low-order bit. Since oops are always aligned at least mod 4, 833 // setting the low-order bit will ensure that the low half of the 834 // word will never look like that of a real oop. 835 // 836 // Using the OS-supplied non-memory-address word (usually 0 or -1) 837 // will take care of the high bits, however many there are. 838 839 if (_non_oop_bits == 0) { 840 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 841 } 842 843 return (void*)_non_oop_bits; 844 } 845 846 bool Universe::contains_non_oop_word(void* p) { 847 return *(void**)p == non_oop_word(); 848 } 849 850 static void initialize_global_behaviours() { 851 DefaultICProtectionBehaviour* protection_behavior = new DefaultICProtectionBehaviour(); 852 // Ignore leak of DefaultICProtectionBehaviour. It is overriden by some GC implementations and the 853 // pointer is leaked once. 854 LSAN_IGNORE_OBJECT(protection_behavior); 855 CompiledICProtectionBehaviour::set_current(protection_behavior); 856 } 857 858 jint universe_init() { 859 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 860 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 861 "LogHeapWordSize is incorrect."); 862 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 863 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 864 "oop size is not not a multiple of HeapWord size"); 865 866 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 867 868 initialize_global_behaviours(); 869 870 GCLogPrecious::initialize(); 871 872 // Initialize CPUTimeCounters object, which must be done before creation of the heap. 873 CPUTimeCounters::initialize(); 874 875 ObjLayout::initialize(); 876 877 #ifdef _LP64 878 MetaspaceShared::adjust_heap_sizes_for_dumping(); 879 #endif // _LP64 880 881 GCConfig::arguments()->initialize_heap_sizes(); 882 883 jint status = Universe::initialize_heap(); 884 if (status != JNI_OK) { 885 return status; 886 } 887 888 Universe::initialize_tlab(); 889 890 Metaspace::global_initialize(); 891 892 // Initialize performance counters for metaspaces 893 MetaspaceCounters::initialize_performance_counters(); 894 895 // Checks 'AfterMemoryInit' constraints. 896 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) { 897 return JNI_EINVAL; 898 } 899 900 ClassLoaderData::init_null_class_loader_data(); 901 902 #if INCLUDE_CDS 903 if (CDSConfig::is_using_archive()) { 904 // Read the data structures supporting the shared spaces (shared 905 // system dictionary, symbol table, etc.) 906 MetaspaceShared::initialize_shared_spaces(); 907 } 908 if (CDSConfig::is_dumping_archive()) { 909 CDSConfig::prepare_for_dumping(); 910 } 911 #endif 912 913 SymbolTable::create_table(); 914 StringTable::create_table(); 915 916 if (strlen(VerifySubSet) > 0) { 917 Universe::initialize_verify_flags(); 918 } 919 920 ResolvedMethodTable::create_table(); 921 922 return JNI_OK; 923 } 924 925 jint Universe::initialize_heap() { 926 assert(_collectedHeap == nullptr, "Heap already created"); 927 _collectedHeap = GCConfig::arguments()->create_heap(); 928 929 log_info(gc)("Using %s", _collectedHeap->name()); 930 return _collectedHeap->initialize(); 931 } 932 933 void Universe::initialize_tlab() { 934 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 935 PLAB::startup_initialization(); 936 if (UseTLAB) { 937 ThreadLocalAllocBuffer::startup_initialization(); 938 } 939 } 940 941 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 942 943 assert(alignment <= Arguments::conservative_max_heap_alignment(), 944 "actual alignment %zu must be within maximum heap alignment %zu", 945 alignment, Arguments::conservative_max_heap_alignment()); 946 947 size_t total_reserved = align_up(heap_size, alignment); 948 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 949 "heap size is too big for compressed oops"); 950 951 size_t page_size = os::vm_page_size(); 952 if (UseLargePages && is_aligned(alignment, os::large_page_size())) { 953 page_size = os::large_page_size(); 954 } else { 955 // Parallel is the only collector that might opt out of using large pages 956 // for the heap. 957 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages"); 958 } 959 960 // Now create the space. 961 ReservedHeapSpace rhs = HeapReserver::reserve(total_reserved, alignment, page_size, AllocateHeapAt); 962 963 if (!rhs.is_reserved()) { 964 vm_exit_during_initialization( 965 err_msg("Could not reserve enough space for %zu KB object heap", 966 total_reserved/K)); 967 } 968 969 assert(total_reserved == rhs.size(), "must be exactly of required size"); 970 assert(is_aligned(rhs.base(),alignment),"must be exactly of required alignment"); 971 972 assert(markWord::encode_pointer_as_mark(rhs.base()).decode_pointer() == rhs.base(), 973 "area must be distinguishable from marks for mark-sweep"); 974 assert(markWord::encode_pointer_as_mark(&rhs.base()[rhs.size()]).decode_pointer() == 975 &rhs.base()[rhs.size()], 976 "area must be distinguishable from marks for mark-sweep"); 977 978 // We are good. 979 980 if (AllocateHeapAt != nullptr) { 981 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 982 } 983 984 if (UseCompressedOops) { 985 CompressedOops::initialize(rhs); 986 } 987 988 Universe::calculate_verify_data((HeapWord*)rhs.base(), (HeapWord*)rhs.end()); 989 990 return rhs; 991 } 992 993 OopStorage* Universe::vm_weak() { 994 return Universe::_vm_weak; 995 } 996 997 OopStorage* Universe::vm_global() { 998 return Universe::_vm_global; 999 } 1000 1001 void Universe::oopstorage_init() { 1002 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal); 1003 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal); 1004 } 1005 1006 void universe_oopstorage_init() { 1007 Universe::oopstorage_init(); 1008 } 1009 1010 void LatestMethodCache::init(JavaThread* current, InstanceKlass* ik, 1011 const char* method, Symbol* signature, bool is_static) 1012 { 1013 TempNewSymbol name = SymbolTable::new_symbol(method); 1014 Method* m = nullptr; 1015 // The klass must be linked before looking up the method. 1016 if (!ik->link_class_or_fail(current) || 1017 ((m = ik->find_method(name, signature)) == nullptr) || 1018 is_static != m->is_static()) { 1019 ResourceMark rm(current); 1020 // NoSuchMethodException doesn't actually work because it tries to run the 1021 // <init> function before java_lang_Class is linked. Print error and exit. 1022 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 1023 ik->name()->as_C_string(), method)); 1024 } 1025 1026 _klass = ik; 1027 _method_idnum = m->method_idnum(); 1028 assert(_method_idnum >= 0, "sanity check"); 1029 } 1030 1031 Method* LatestMethodCache::get_method() { 1032 if (_klass == nullptr) { 1033 return nullptr; 1034 } else { 1035 Method* m = _klass->method_with_idnum(_method_idnum); 1036 assert(m != nullptr, "sanity check"); 1037 return m; 1038 } 1039 } 1040 1041 Method* Universe::finalizer_register_method() { return _finalizer_register_cache.get_method(); } 1042 Method* Universe::loader_addClass_method() { return _loader_addClass_cache.get_method(); } 1043 Method* Universe::throw_illegal_access_error() { return _throw_illegal_access_error_cache.get_method(); } 1044 Method* Universe::throw_no_such_method_error() { return _throw_no_such_method_error_cache.get_method(); } 1045 Method* Universe::do_stack_walk_method() { return _do_stack_walk_cache.get_method(); } 1046 1047 void Universe::initialize_known_methods(JavaThread* current) { 1048 // Set up static method for registering finalizers 1049 _finalizer_register_cache.init(current, 1050 vmClasses::Finalizer_klass(), 1051 "register", 1052 vmSymbols::object_void_signature(), true); 1053 1054 _throw_illegal_access_error_cache.init(current, 1055 vmClasses::internal_Unsafe_klass(), 1056 "throwIllegalAccessError", 1057 vmSymbols::void_method_signature(), true); 1058 1059 _throw_no_such_method_error_cache.init(current, 1060 vmClasses::internal_Unsafe_klass(), 1061 "throwNoSuchMethodError", 1062 vmSymbols::void_method_signature(), true); 1063 1064 // Set up method for registering loaded classes in class loader vector 1065 _loader_addClass_cache.init(current, 1066 vmClasses::ClassLoader_klass(), 1067 "addClass", 1068 vmSymbols::class_void_signature(), false); 1069 1070 // Set up method for stack walking 1071 _do_stack_walk_cache.init(current, 1072 vmClasses::AbstractStackWalker_klass(), 1073 "doStackWalk", 1074 vmSymbols::doStackWalk_signature(), false); 1075 } 1076 1077 void universe2_init() { 1078 EXCEPTION_MARK; 1079 Universe::genesis(CATCH); 1080 } 1081 1082 // Set after initialization of the module runtime, call_initModuleRuntime 1083 void universe_post_module_init() { 1084 Universe::_module_initialized = true; 1085 } 1086 1087 bool universe_post_init() { 1088 assert(!is_init_completed(), "Error: initialization not yet completed!"); 1089 Universe::_fully_initialized = true; 1090 EXCEPTION_MARK; 1091 if (!CDSConfig::is_using_archive()) { 1092 reinitialize_vtables(); 1093 reinitialize_itables(); 1094 } 1095 1096 HandleMark hm(THREAD); 1097 // Setup preallocated empty java.lang.Class array for Method reflection. 1098 1099 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false); 1100 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array); 1101 1102 // Setup preallocated OutOfMemoryError errors 1103 Universe::create_preallocated_out_of_memory_errors(CHECK_false); 1104 1105 oop instance; 1106 // Setup preallocated cause message for delayed StackOverflowError 1107 if (StackReservedPages > 0) { 1108 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1109 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance); 1110 } 1111 1112 // Setup preallocated exceptions used for a cheap & dirty solution in compiler exception handling 1113 _null_ptr_exception.init_if_empty(vmSymbols::java_lang_NullPointerException(), CHECK_false); 1114 _arithmetic_exception.init_if_empty(vmSymbols::java_lang_ArithmeticException(), CHECK_false); 1115 _array_index_out_of_bounds_exception.init_if_empty(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), CHECK_false); 1116 _array_store_exception.init_if_empty(vmSymbols::java_lang_ArrayStoreException(), CHECK_false); 1117 _class_cast_exception.init_if_empty(vmSymbols::java_lang_ClassCastException(), CHECK_false); 1118 1119 // Virtual Machine Error for when we get into a situation we can't resolve 1120 Klass* k = vmClasses::InternalError_klass(); 1121 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1122 if (!linked) { 1123 tty->print_cr("Unable to link/verify InternalError class"); 1124 return false; // initialization failed 1125 } 1126 _internal_error.init_if_empty(vmSymbols::java_lang_InternalError(), CHECK_false); 1127 1128 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1129 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg()); 1130 1131 // Setup preallocated StackOverflowError for use with class initialization failure 1132 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackOverflowError(), true, CHECK_false); 1133 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1134 Universe::_class_init_stack_overflow_error = OopHandle(Universe::vm_global(), instance); 1135 1136 Universe::initialize_known_methods(THREAD); 1137 1138 // This needs to be done before the first scavenge/gc, since 1139 // it's an input to soft ref clearing policy. 1140 { 1141 MutexLocker x(THREAD, Heap_lock); 1142 Universe::heap()->update_capacity_and_used_at_gc(); 1143 } 1144 1145 // ("weak") refs processing infrastructure initialization 1146 Universe::heap()->post_initialize(); 1147 1148 MemoryService::add_metaspace_memory_pools(); 1149 1150 MemoryService::set_universe_heap(Universe::heap()); 1151 #if INCLUDE_CDS 1152 MetaspaceShared::post_initialize(CHECK_false); 1153 #endif 1154 return true; 1155 } 1156 1157 1158 void Universe::compute_base_vtable_size() { 1159 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1160 } 1161 1162 void Universe::print_on(outputStream* st) { 1163 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1164 st->print_cr("Heap"); 1165 1166 StreamIndentor si(st, 1); 1167 heap()->print_heap_on(st); 1168 MetaspaceUtils::print_on(st); 1169 } 1170 1171 void Universe::print_heap_at_SIGBREAK() { 1172 if (PrintHeapAtSIGBREAK) { 1173 print_on(tty); 1174 tty->cr(); 1175 tty->flush(); 1176 } 1177 } 1178 1179 void Universe::initialize_verify_flags() { 1180 verify_flags = 0; 1181 const char delimiter[] = " ,"; 1182 1183 size_t length = strlen(VerifySubSet); 1184 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1185 strncpy(subset_list, VerifySubSet, length + 1); 1186 char* save_ptr; 1187 1188 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1189 while (token != nullptr) { 1190 if (strcmp(token, "threads") == 0) { 1191 verify_flags |= Verify_Threads; 1192 } else if (strcmp(token, "heap") == 0) { 1193 verify_flags |= Verify_Heap; 1194 } else if (strcmp(token, "symbol_table") == 0) { 1195 verify_flags |= Verify_SymbolTable; 1196 } else if (strcmp(token, "string_table") == 0) { 1197 verify_flags |= Verify_StringTable; 1198 } else if (strcmp(token, "codecache") == 0) { 1199 verify_flags |= Verify_CodeCache; 1200 } else if (strcmp(token, "dictionary") == 0) { 1201 verify_flags |= Verify_SystemDictionary; 1202 } else if (strcmp(token, "classloader_data_graph") == 0) { 1203 verify_flags |= Verify_ClassLoaderDataGraph; 1204 } else if (strcmp(token, "metaspace") == 0) { 1205 verify_flags |= Verify_MetaspaceUtils; 1206 } else if (strcmp(token, "jni_handles") == 0) { 1207 verify_flags |= Verify_JNIHandles; 1208 } else if (strcmp(token, "codecache_oops") == 0) { 1209 verify_flags |= Verify_CodeCacheOops; 1210 } else if (strcmp(token, "resolved_method_table") == 0) { 1211 verify_flags |= Verify_ResolvedMethodTable; 1212 } else if (strcmp(token, "stringdedup") == 0) { 1213 verify_flags |= Verify_StringDedup; 1214 } else { 1215 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1216 } 1217 token = strtok_r(nullptr, delimiter, &save_ptr); 1218 } 1219 FREE_C_HEAP_ARRAY(char, subset_list); 1220 } 1221 1222 bool Universe::should_verify_subset(uint subset) { 1223 if (verify_flags & subset) { 1224 return true; 1225 } 1226 return false; 1227 } 1228 1229 void Universe::verify(VerifyOption option, const char* prefix) { 1230 COMPILER2_PRESENT( 1231 assert(!DerivedPointerTable::is_active(), 1232 "DPT should not be active during verification " 1233 "(of thread stacks below)"); 1234 ) 1235 1236 Thread* thread = Thread::current(); 1237 ResourceMark rm(thread); 1238 HandleMark hm(thread); // Handles created during verification can be zapped 1239 _verify_count++; 1240 1241 FormatBuffer<> title("Verifying %s", prefix); 1242 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1243 if (should_verify_subset(Verify_Threads)) { 1244 log_debug(gc, verify)("Threads"); 1245 Threads::verify(); 1246 } 1247 if (should_verify_subset(Verify_Heap)) { 1248 log_debug(gc, verify)("Heap"); 1249 heap()->verify(option); 1250 } 1251 if (should_verify_subset(Verify_SymbolTable)) { 1252 log_debug(gc, verify)("SymbolTable"); 1253 SymbolTable::verify(); 1254 } 1255 if (should_verify_subset(Verify_StringTable)) { 1256 log_debug(gc, verify)("StringTable"); 1257 StringTable::verify(); 1258 } 1259 if (should_verify_subset(Verify_CodeCache)) { 1260 log_debug(gc, verify)("CodeCache"); 1261 CodeCache::verify(); 1262 } 1263 if (should_verify_subset(Verify_SystemDictionary)) { 1264 log_debug(gc, verify)("SystemDictionary"); 1265 SystemDictionary::verify(); 1266 } 1267 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1268 log_debug(gc, verify)("ClassLoaderDataGraph"); 1269 ClassLoaderDataGraph::verify(); 1270 } 1271 if (should_verify_subset(Verify_MetaspaceUtils)) { 1272 log_debug(gc, verify)("MetaspaceUtils"); 1273 DEBUG_ONLY(MetaspaceUtils::verify();) 1274 } 1275 if (should_verify_subset(Verify_JNIHandles)) { 1276 log_debug(gc, verify)("JNIHandles"); 1277 JNIHandles::verify(); 1278 } 1279 if (should_verify_subset(Verify_CodeCacheOops)) { 1280 log_debug(gc, verify)("CodeCache Oops"); 1281 CodeCache::verify_oops(); 1282 } 1283 if (should_verify_subset(Verify_ResolvedMethodTable)) { 1284 log_debug(gc, verify)("ResolvedMethodTable Oops"); 1285 ResolvedMethodTable::verify(); 1286 } 1287 if (should_verify_subset(Verify_StringDedup)) { 1288 log_debug(gc, verify)("String Deduplication"); 1289 StringDedup::verify(); 1290 } 1291 } 1292 1293 1294 #ifndef PRODUCT 1295 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1296 assert(low_boundary < high_boundary, "bad interval"); 1297 1298 // decide which low-order bits we require to be clear: 1299 size_t alignSize = MinObjAlignmentInBytes; 1300 size_t min_object_size = CollectedHeap::min_fill_size(); 1301 1302 // make an inclusive limit: 1303 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1304 uintptr_t min = (uintptr_t)low_boundary; 1305 assert(min < max, "bad interval"); 1306 uintptr_t diff = max ^ min; 1307 1308 // throw away enough low-order bits to make the diff vanish 1309 uintptr_t mask = (uintptr_t)(-1); 1310 while ((mask & diff) != 0) 1311 mask <<= 1; 1312 uintptr_t bits = (min & mask); 1313 assert(bits == (max & mask), "correct mask"); 1314 // check an intermediate value between min and max, just to make sure: 1315 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1316 1317 // require address alignment, too: 1318 mask |= (alignSize - 1); 1319 1320 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1321 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1322 } 1323 _verify_oop_mask = mask; 1324 _verify_oop_bits = bits; 1325 } 1326 1327 void Universe::set_verify_data(uintptr_t mask, uintptr_t bits) { 1328 _verify_oop_mask = mask; 1329 _verify_oop_bits = bits; 1330 } 1331 1332 // Oop verification (see MacroAssembler::verify_oop) 1333 1334 uintptr_t Universe::verify_oop_mask() { 1335 return _verify_oop_mask; 1336 } 1337 1338 uintptr_t Universe::verify_oop_bits() { 1339 return _verify_oop_bits; 1340 } 1341 1342 uintptr_t Universe::verify_mark_mask() { 1343 return markWord::lock_mask_in_place; 1344 } 1345 1346 uintptr_t Universe::verify_mark_bits() { 1347 intptr_t mask = verify_mark_mask(); 1348 intptr_t bits = (intptr_t)markWord::prototype().value(); 1349 assert((bits & ~mask) == 0, "no stray header bits"); 1350 return bits; 1351 } 1352 #endif // PRODUCT 1353 1354 #ifdef ASSERT 1355 // Release dummy object(s) at bottom of heap 1356 bool Universe::release_fullgc_alot_dummy() { 1357 MutexLocker ml(FullGCALot_lock); 1358 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve(); 1359 if (fullgc_alot_dummy_array != nullptr) { 1360 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) { 1361 // No more dummies to release, release entire array instead 1362 _fullgc_alot_dummy_array.release(Universe::vm_global()); 1363 _fullgc_alot_dummy_array = OopHandle(); // null out OopStorage pointer. 1364 return false; 1365 } 1366 1367 // Release dummy at bottom of old generation 1368 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, nullptr); 1369 } 1370 return true; 1371 } 1372 1373 bool Universe::is_stw_gc_active() { 1374 return heap()->is_stw_gc_active(); 1375 } 1376 1377 bool Universe::is_in_heap(const void* p) { 1378 return heap()->is_in(p); 1379 } 1380 1381 #endif // ASSERT --- EOF ---