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 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 (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " 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 assert(oopDesc::klass_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()), 403 "Klass offset is expected to be less than the page size"); 404 assert(arrayOopDesc::length_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()), 405 "Array length offset is expected to be less than the page size"); 406 407 { AutoModifyRestore<bool> temporarily(_bootstrapping, true); 408 409 java_lang_Class::allocate_fixup_lists(); 410 411 // determine base vtable size; without that we cannot create the array klasses 412 compute_base_vtable_size(); 413 414 if (!CDSConfig::is_using_archive()) { 415 // Initialization of the fillerArrayKlass must come before regular 416 // int-TypeArrayKlass so that the int-Array mirror points to the 417 // int-TypeArrayKlass. 418 _fillerArrayKlass = TypeArrayKlass::create_klass(T_INT, "[Ljdk/internal/vm/FillerElement;", CHECK); 419 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 420 _typeArrayKlasses[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 421 } 422 423 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 424 425 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, nullptr, CHECK); 426 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 427 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 428 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 429 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 430 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 431 } 432 433 vmSymbols::initialize(); 434 435 SystemDictionary::initialize(CHECK); 436 437 // Create string constants 438 oop s = StringTable::intern("null", CHECK); 439 _the_null_string = OopHandle(vm_global(), s); 440 s = StringTable::intern("-2147483648", CHECK); 441 _the_min_jint_string = OopHandle(vm_global(), s); 442 443 444 #if INCLUDE_CDS 445 if (CDSConfig::is_using_archive()) { 446 // Verify shared interfaces array. 447 assert(_the_array_interfaces_array->at(0) == 448 vmClasses::Cloneable_klass(), "u3"); 449 assert(_the_array_interfaces_array->at(1) == 450 vmClasses::Serializable_klass(), "u3"); 451 452 } else 453 #endif 454 { 455 // Set up shared interfaces array. (Do this before supers are set up.) 456 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass()); 457 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass()); 458 } 459 460 if (UseSecondarySupersTable) { 461 Universe::_the_array_interfaces_bitmap = Klass::compute_secondary_supers_bitmap(_the_array_interfaces_array); 462 Universe::_the_empty_klass_bitmap = Klass::compute_secondary_supers_bitmap(_the_empty_klass_array); 463 } 464 465 initialize_basic_type_klass(_fillerArrayKlass, CHECK); 466 467 initialize_basic_type_klass(boolArrayKlass(), CHECK); 468 initialize_basic_type_klass(charArrayKlass(), CHECK); 469 initialize_basic_type_klass(floatArrayKlass(), CHECK); 470 initialize_basic_type_klass(doubleArrayKlass(), CHECK); 471 initialize_basic_type_klass(byteArrayKlass(), CHECK); 472 initialize_basic_type_klass(shortArrayKlass(), CHECK); 473 initialize_basic_type_klass(intArrayKlass(), CHECK); 474 initialize_basic_type_klass(longArrayKlass(), CHECK); 475 476 assert(_fillerArrayKlass != intArrayKlass(), 477 "Internal filler array klass should be different to int array Klass"); 478 } // end of core bootstrapping 479 480 { 481 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 482 _the_null_sentinel = OopHandle(vm_global(), tns()); 483 } 484 485 // Create a handle for reference_pending_list 486 _reference_pending_list = OopHandle(vm_global(), nullptr); 487 488 // Maybe this could be lifted up now that object array can be initialized 489 // during the bootstrapping. 490 491 // OLD 492 // Initialize _objectArrayKlass after core bootstraping to make 493 // sure the super class is set up properly for _objectArrayKlass. 494 // --- 495 // NEW 496 // Since some of the old system object arrays have been converted to 497 // ordinary object arrays, _objectArrayKlass will be loaded when 498 // SystemDictionary::initialize(CHECK); is run. See the extra check 499 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 500 { 501 Klass* oak = vmClasses::Object_klass()->array_klass(CHECK); 502 _objectArrayKlass = ObjArrayKlass::cast(oak); 503 } 504 // OLD 505 // Add the class to the class hierarchy manually to make sure that 506 // its vtable is initialized after core bootstrapping is completed. 507 // --- 508 // New 509 // Have already been initialized. 510 _objectArrayKlass->append_to_sibling_list(); 511 512 #ifdef ASSERT 513 if (FullGCALot) { 514 // Allocate an array of dummy objects. 515 // We'd like these to be at the bottom of the old generation, 516 // so that when we free one and then collect, 517 // (almost) the whole heap moves 518 // and we find out if we actually update all the oops correctly. 519 // But we can't allocate directly in the old generation, 520 // so we allocate wherever, and hope that the first collection 521 // moves these objects to the bottom of the old generation. 522 int size = FullGCALotDummies * 2; 523 524 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK); 525 objArrayHandle dummy_array(THREAD, naked_array); 526 int i = 0; 527 while (i < size) { 528 // Allocate dummy in old generation 529 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK); 530 dummy_array->obj_at_put(i++, dummy); 531 } 532 { 533 // Only modify the global variable inside the mutex. 534 // If we had a race to here, the other dummy_array instances 535 // and their elements just get dropped on the floor, which is fine. 536 MutexLocker ml(THREAD, FullGCALot_lock); 537 if (_fullgc_alot_dummy_array.is_empty()) { 538 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array()); 539 } 540 } 541 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking"); 542 } 543 #endif 544 } 545 546 void Universe::initialize_basic_type_mirrors(TRAPS) { 547 #if INCLUDE_CDS_JAVA_HEAP 548 if (CDSConfig::is_using_archive() && 549 ArchiveHeapLoader::is_in_use() && 550 _basic_type_mirrors[T_INT].resolve() != nullptr) { 551 assert(ArchiveHeapLoader::can_use(), "Sanity"); 552 553 // check that all basic type mirrors are mapped also 554 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 555 if (!is_reference_type((BasicType)i)) { 556 oop m = _basic_type_mirrors[i].resolve(); 557 assert(m != nullptr, "archived mirrors should not be null"); 558 } 559 } 560 } else 561 // _basic_type_mirrors[T_INT], etc, are null if archived heap is not mapped. 562 #endif 563 { 564 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 565 BasicType bt = (BasicType)i; 566 if (!is_reference_type(bt)) { 567 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK); 568 _basic_type_mirrors[i] = OopHandle(vm_global(), m); 569 } 570 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1); 571 } 572 } 573 if (CDSConfig::is_dumping_heap()) { 574 HeapShared::init_scratch_objects(CHECK); 575 } 576 } 577 578 void Universe::fixup_mirrors(TRAPS) { 579 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 580 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 581 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 582 // that the number of objects allocated at this point is very small. 583 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded"); 584 HandleMark hm(THREAD); 585 586 if (!CDSConfig::is_using_archive()) { 587 // Cache the start of the static fields 588 InstanceMirrorKlass::init_offset_of_static_fields(); 589 } 590 591 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 592 int list_length = list->length(); 593 for (int i = 0; i < list_length; i++) { 594 Klass* k = list->at(i); 595 assert(k->is_klass(), "List should only hold classes"); 596 java_lang_Class::fixup_mirror(k, CATCH); 597 } 598 delete java_lang_Class::fixup_mirror_list(); 599 java_lang_Class::set_fixup_mirror_list(nullptr); 600 } 601 602 #define assert_pll_locked(test) \ 603 assert(Heap_lock->test(), "Reference pending list access requires lock") 604 605 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 606 607 oop Universe::reference_pending_list() { 608 if (Thread::current()->is_VM_thread()) { 609 assert_pll_locked(is_locked); 610 } else { 611 assert_pll_ownership(); 612 } 613 return _reference_pending_list.resolve(); 614 } 615 616 void Universe::clear_reference_pending_list() { 617 assert_pll_ownership(); 618 _reference_pending_list.replace(nullptr); 619 } 620 621 bool Universe::has_reference_pending_list() { 622 assert_pll_ownership(); 623 return _reference_pending_list.peek() != nullptr; 624 } 625 626 oop Universe::swap_reference_pending_list(oop list) { 627 assert_pll_locked(is_locked); 628 return _reference_pending_list.xchg(list); 629 } 630 631 #undef assert_pll_locked 632 #undef assert_pll_ownership 633 634 static void reinitialize_vtables() { 635 // The vtables are initialized by starting at java.lang.Object and 636 // initializing through the subclass links, so that the super 637 // classes are always initialized first. 638 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) { 639 Klass* sub = iter.klass(); 640 sub->vtable().initialize_vtable(); 641 } 642 } 643 644 static void reinitialize_itables() { 645 646 class ReinitTableClosure : public KlassClosure { 647 public: 648 void do_klass(Klass* k) { 649 if (k->is_instance_klass()) { 650 InstanceKlass::cast(k)->itable().initialize_itable(); 651 } 652 } 653 }; 654 655 MutexLocker mcld(ClassLoaderDataGraph_lock); 656 ReinitTableClosure cl; 657 ClassLoaderDataGraph::classes_do(&cl); 658 } 659 660 bool Universe::on_page_boundary(void* addr) { 661 return is_aligned(addr, os::vm_page_size()); 662 } 663 664 // the array of preallocated errors with backtraces 665 objArrayOop Universe::preallocated_out_of_memory_errors() { 666 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve(); 667 } 668 669 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); } 670 671 oop Universe::out_of_memory_error_java_heap() { 672 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap)); 673 } 674 675 oop Universe::out_of_memory_error_java_heap_without_backtrace() { 676 return out_of_memory_errors()->obj_at(_oom_java_heap); 677 } 678 679 oop Universe::out_of_memory_error_c_heap() { 680 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap)); 681 } 682 683 oop Universe::out_of_memory_error_metaspace() { 684 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace)); 685 } 686 687 oop Universe::out_of_memory_error_class_metaspace() { 688 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace)); 689 } 690 691 oop Universe::out_of_memory_error_array_size() { 692 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size)); 693 } 694 695 oop Universe::out_of_memory_error_gc_overhead_limit() { 696 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit)); 697 } 698 699 oop Universe::out_of_memory_error_realloc_objects() { 700 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects)); 701 } 702 703 oop Universe::class_init_out_of_memory_error() { return out_of_memory_errors()->obj_at(_oom_java_heap); } 704 oop Universe::class_init_stack_overflow_error() { return _class_init_stack_overflow_error.resolve(); } 705 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); } 706 707 708 bool Universe::should_fill_in_stack_trace(Handle throwable) { 709 // never attempt to fill in the stack trace of preallocated errors that do not have 710 // backtrace. These errors are kept alive forever and may be "re-used" when all 711 // preallocated errors with backtrace have been consumed. Also need to avoid 712 // a potential loop which could happen if an out of memory occurs when attempting 713 // to allocate the backtrace. 714 objArrayOop preallocated_oom = out_of_memory_errors(); 715 for (int i = 0; i < _oom_count; i++) { 716 if (throwable() == preallocated_oom->obj_at(i)) { 717 return false; 718 } 719 } 720 return true; 721 } 722 723 724 oop Universe::gen_out_of_memory_error(oop default_err) { 725 // generate an out of memory error: 726 // - if there is a preallocated error and stack traces are available 727 // (j.l.Throwable is initialized), then return the preallocated 728 // error with a filled in stack trace, and with the message 729 // provided by the default error. 730 // - otherwise, return the default error, without a stack trace. 731 int next; 732 if ((_preallocated_out_of_memory_error_avail_count > 0) && 733 vmClasses::Throwable_klass()->is_initialized()) { 734 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1); 735 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 736 } else { 737 next = -1; 738 } 739 if (next < 0) { 740 // all preallocated errors have been used. 741 // return default 742 return default_err; 743 } else { 744 JavaThread* current = JavaThread::current(); 745 Handle default_err_h(current, default_err); 746 // get the error object at the slot and set set it to null so that the 747 // array isn't keeping it alive anymore. 748 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next)); 749 assert(exc() != nullptr, "slot has been used already"); 750 preallocated_out_of_memory_errors()->obj_at_put(next, nullptr); 751 752 // use the message from the default error 753 oop msg = java_lang_Throwable::message(default_err_h()); 754 assert(msg != nullptr, "no message"); 755 java_lang_Throwable::set_message(exc(), msg); 756 757 // populate the stack trace and return it. 758 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 759 return exc(); 760 } 761 } 762 763 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) { 764 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve(); 765 } 766 767 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) { 768 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve(); 769 } 770 771 // Setup preallocated OutOfMemoryError errors 772 void Universe::create_preallocated_out_of_memory_errors(TRAPS) { 773 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass(); 774 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK); 775 objArrayHandle oom_array(THREAD, oa); 776 777 for (int i = 0; i < _oom_count; i++) { 778 oop oom_obj = ik->allocate_instance(CHECK); 779 oom_array->obj_at_put(i, oom_obj); 780 } 781 _out_of_memory_errors = OopHandle(vm_global(), oom_array()); 782 783 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK); 784 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg()); 785 786 msg = java_lang_String::create_from_str("C heap space", CHECK); 787 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg()); 788 789 msg = java_lang_String::create_from_str("Metaspace", CHECK); 790 _msg_metaspace = OopHandle(vm_global(), msg()); 791 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg()); 792 793 msg = java_lang_String::create_from_str("Compressed class space", CHECK); 794 _msg_class_metaspace = OopHandle(vm_global(), msg()); 795 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg()); 796 797 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK); 798 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg()); 799 800 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK); 801 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg()); 802 803 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK); 804 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg()); 805 806 // Setup the array of errors that have preallocated backtrace 807 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 808 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK); 809 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance); 810 objArrayHandle preallocated_oom_array(THREAD, instance); 811 812 for (int i=0; i<len; i++) { 813 oop err = ik->allocate_instance(CHECK); 814 Handle err_h(THREAD, err); 815 java_lang_Throwable::allocate_backtrace(err_h, CHECK); 816 preallocated_oom_array->obj_at_put(i, err_h()); 817 } 818 _preallocated_out_of_memory_error_avail_count = (jint)len; 819 } 820 821 intptr_t Universe::_non_oop_bits = 0; 822 823 void* Universe::non_oop_word() { 824 // Neither the high bits nor the low bits of this value is allowed 825 // to look like (respectively) the high or low bits of a real oop. 826 // 827 // High and low are CPU-specific notions, but low always includes 828 // the low-order bit. Since oops are always aligned at least mod 4, 829 // setting the low-order bit will ensure that the low half of the 830 // word will never look like that of a real oop. 831 // 832 // Using the OS-supplied non-memory-address word (usually 0 or -1) 833 // will take care of the high bits, however many there are. 834 835 if (_non_oop_bits == 0) { 836 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 837 } 838 839 return (void*)_non_oop_bits; 840 } 841 842 bool Universe::contains_non_oop_word(void* p) { 843 return *(void**)p == non_oop_word(); 844 } 845 846 static void initialize_global_behaviours() { 847 DefaultICProtectionBehaviour* protection_behavior = new DefaultICProtectionBehaviour(); 848 // Ignore leak of DefaultICProtectionBehaviour. It is overriden by some GC implementations and the 849 // pointer is leaked once. 850 LSAN_IGNORE_OBJECT(protection_behavior); 851 CompiledICProtectionBehaviour::set_current(protection_behavior); 852 } 853 854 jint universe_init() { 855 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 856 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 857 "LogHeapWordSize is incorrect."); 858 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 859 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 860 "oop size is not not a multiple of HeapWord size"); 861 862 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 863 864 initialize_global_behaviours(); 865 866 GCLogPrecious::initialize(); 867 868 // Initialize CPUTimeCounters object, which must be done before creation of the heap. 869 CPUTimeCounters::initialize(); 870 871 #ifdef _LP64 872 MetaspaceShared::adjust_heap_sizes_for_dumping(); 873 #endif // _LP64 874 875 GCConfig::arguments()->initialize_heap_sizes(); 876 877 jint status = Universe::initialize_heap(); 878 if (status != JNI_OK) { 879 return status; 880 } 881 882 Universe::initialize_tlab(); 883 884 Metaspace::global_initialize(); 885 // Initialize performance counters for metaspaces 886 MetaspaceCounters::initialize_performance_counters(); 887 888 // Checks 'AfterMemoryInit' constraints. 889 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) { 890 return JNI_EINVAL; 891 } 892 893 ClassLoaderData::init_null_class_loader_data(); 894 895 #if INCLUDE_CDS 896 DynamicArchive::check_for_dynamic_dump(); 897 if (CDSConfig::is_using_archive()) { 898 // Read the data structures supporting the shared spaces (shared 899 // system dictionary, symbol table, etc.) 900 MetaspaceShared::initialize_shared_spaces(); 901 } 902 if (CDSConfig::is_dumping_archive()) { 903 MetaspaceShared::prepare_for_dumping(); 904 } 905 #endif 906 907 SymbolTable::create_table(); 908 StringTable::create_table(); 909 910 if (strlen(VerifySubSet) > 0) { 911 Universe::initialize_verify_flags(); 912 } 913 914 ResolvedMethodTable::create_table(); 915 916 return JNI_OK; 917 } 918 919 jint Universe::initialize_heap() { 920 assert(_collectedHeap == nullptr, "Heap already created"); 921 _collectedHeap = GCConfig::arguments()->create_heap(); 922 923 log_info(gc)("Using %s", _collectedHeap->name()); 924 return _collectedHeap->initialize(); 925 } 926 927 void Universe::initialize_tlab() { 928 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 929 PLAB::startup_initialization(); 930 if (UseTLAB) { 931 ThreadLocalAllocBuffer::startup_initialization(); 932 } 933 } 934 935 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 936 937 assert(alignment <= Arguments::conservative_max_heap_alignment(), 938 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 939 alignment, Arguments::conservative_max_heap_alignment()); 940 941 size_t total_reserved = align_up(heap_size, alignment); 942 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 943 "heap size is too big for compressed oops"); 944 945 size_t page_size = os::vm_page_size(); 946 if (UseLargePages && is_aligned(alignment, os::large_page_size())) { 947 page_size = os::large_page_size(); 948 } else { 949 // Parallel is the only collector that might opt out of using large pages 950 // for the heap. 951 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages"); 952 } 953 954 // Now create the space. 955 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt); 956 957 if (total_rs.is_reserved()) { 958 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 959 "must be exactly of required size and alignment"); 960 // We are good. 961 962 if (AllocateHeapAt != nullptr) { 963 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 964 } 965 966 if (UseCompressedOops) { 967 CompressedOops::initialize(total_rs); 968 } 969 970 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end()); 971 972 return total_rs; 973 } 974 975 vm_exit_during_initialization( 976 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 977 total_reserved/K)); 978 979 // satisfy compiler 980 ShouldNotReachHere(); 981 return ReservedHeapSpace(0, 0, os::vm_page_size()); 982 } 983 984 OopStorage* Universe::vm_weak() { 985 return Universe::_vm_weak; 986 } 987 988 OopStorage* Universe::vm_global() { 989 return Universe::_vm_global; 990 } 991 992 void Universe::oopstorage_init() { 993 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal); 994 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal); 995 } 996 997 void universe_oopstorage_init() { 998 Universe::oopstorage_init(); 999 } 1000 1001 void LatestMethodCache::init(JavaThread* current, InstanceKlass* ik, 1002 const char* method, Symbol* signature, bool is_static) 1003 { 1004 TempNewSymbol name = SymbolTable::new_symbol(method); 1005 Method* m = nullptr; 1006 // The klass must be linked before looking up the method. 1007 if (!ik->link_class_or_fail(current) || 1008 ((m = ik->find_method(name, signature)) == nullptr) || 1009 is_static != m->is_static()) { 1010 ResourceMark rm(current); 1011 // NoSuchMethodException doesn't actually work because it tries to run the 1012 // <init> function before java_lang_Class is linked. Print error and exit. 1013 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 1014 ik->name()->as_C_string(), method)); 1015 } 1016 1017 _klass = ik; 1018 _method_idnum = m->method_idnum(); 1019 assert(_method_idnum >= 0, "sanity check"); 1020 } 1021 1022 Method* LatestMethodCache::get_method() { 1023 if (_klass == nullptr) { 1024 return nullptr; 1025 } else { 1026 Method* m = _klass->method_with_idnum(_method_idnum); 1027 assert(m != nullptr, "sanity check"); 1028 return m; 1029 } 1030 } 1031 1032 Method* Universe::finalizer_register_method() { return _finalizer_register_cache.get_method(); } 1033 Method* Universe::loader_addClass_method() { return _loader_addClass_cache.get_method(); } 1034 Method* Universe::throw_illegal_access_error() { return _throw_illegal_access_error_cache.get_method(); } 1035 Method* Universe::throw_no_such_method_error() { return _throw_no_such_method_error_cache.get_method(); } 1036 Method* Universe::do_stack_walk_method() { return _do_stack_walk_cache.get_method(); } 1037 Method* Universe::is_substitutable_method() { return _is_substitutable_cache.get_method(); } 1038 Method* Universe::value_object_hash_code_method() { return _value_object_hash_code_cache.get_method(); } 1039 1040 void Universe::initialize_known_methods(JavaThread* current) { 1041 // Set up static method for registering finalizers 1042 _finalizer_register_cache.init(current, 1043 vmClasses::Finalizer_klass(), 1044 "register", 1045 vmSymbols::object_void_signature(), true); 1046 1047 _throw_illegal_access_error_cache.init(current, 1048 vmClasses::internal_Unsafe_klass(), 1049 "throwIllegalAccessError", 1050 vmSymbols::void_method_signature(), true); 1051 1052 _throw_no_such_method_error_cache.init(current, 1053 vmClasses::internal_Unsafe_klass(), 1054 "throwNoSuchMethodError", 1055 vmSymbols::void_method_signature(), true); 1056 1057 // Set up method for registering loaded classes in class loader vector 1058 _loader_addClass_cache.init(current, 1059 vmClasses::ClassLoader_klass(), 1060 "addClass", 1061 vmSymbols::class_void_signature(), false); 1062 1063 // Set up method for stack walking 1064 _do_stack_walk_cache.init(current, 1065 vmClasses::AbstractStackWalker_klass(), 1066 "doStackWalk", 1067 vmSymbols::doStackWalk_signature(), false); 1068 1069 // Set up substitutability testing 1070 ResourceMark rm(current); 1071 _is_substitutable_cache.init(current, 1072 vmClasses::ValueObjectMethods_klass(), 1073 vmSymbols::isSubstitutable_name()->as_C_string(), 1074 vmSymbols::object_object_boolean_signature(), true); 1075 _value_object_hash_code_cache.init(current, 1076 vmClasses::ValueObjectMethods_klass(), 1077 vmSymbols::valueObjectHashCode_name()->as_C_string(), 1078 vmSymbols::object_int_signature(), true); 1079 } 1080 1081 void universe2_init() { 1082 EXCEPTION_MARK; 1083 Universe::genesis(CATCH); 1084 } 1085 1086 // Set after initialization of the module runtime, call_initModuleRuntime 1087 void universe_post_module_init() { 1088 Universe::_module_initialized = true; 1089 } 1090 1091 bool universe_post_init() { 1092 assert(!is_init_completed(), "Error: initialization not yet completed!"); 1093 Universe::_fully_initialized = true; 1094 EXCEPTION_MARK; 1095 if (!CDSConfig::is_using_archive()) { 1096 reinitialize_vtables(); 1097 reinitialize_itables(); 1098 } 1099 1100 HandleMark hm(THREAD); 1101 // Setup preallocated empty java.lang.Class array for Method reflection. 1102 1103 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false); 1104 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array); 1105 1106 // Setup preallocated OutOfMemoryError errors 1107 Universe::create_preallocated_out_of_memory_errors(CHECK_false); 1108 1109 oop instance; 1110 // Setup preallocated cause message for delayed StackOverflowError 1111 if (StackReservedPages > 0) { 1112 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1113 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance); 1114 } 1115 1116 // Setup preallocated exceptions used for a cheap & dirty solution in compiler exception handling 1117 _null_ptr_exception.init_if_empty(vmSymbols::java_lang_NullPointerException(), CHECK_false); 1118 _arithmetic_exception.init_if_empty(vmSymbols::java_lang_ArithmeticException(), CHECK_false); 1119 _array_index_out_of_bounds_exception.init_if_empty(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), CHECK_false); 1120 _array_store_exception.init_if_empty(vmSymbols::java_lang_ArrayStoreException(), CHECK_false); 1121 _class_cast_exception.init_if_empty(vmSymbols::java_lang_ClassCastException(), CHECK_false); 1122 1123 // Virtual Machine Error for when we get into a situation we can't resolve 1124 Klass* k = vmClasses::InternalError_klass(); 1125 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1126 if (!linked) { 1127 tty->print_cr("Unable to link/verify InternalError class"); 1128 return false; // initialization failed 1129 } 1130 _internal_error.init_if_empty(vmSymbols::java_lang_InternalError(), CHECK_false); 1131 1132 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1133 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg()); 1134 1135 // Setup preallocated StackOverflowError for use with class initialization failure 1136 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackOverflowError(), true, CHECK_false); 1137 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1138 Universe::_class_init_stack_overflow_error = OopHandle(Universe::vm_global(), instance); 1139 1140 Universe::initialize_known_methods(THREAD); 1141 1142 // This needs to be done before the first scavenge/gc, since 1143 // it's an input to soft ref clearing policy. 1144 { 1145 MutexLocker x(THREAD, Heap_lock); 1146 Universe::heap()->update_capacity_and_used_at_gc(); 1147 } 1148 1149 // ("weak") refs processing infrastructure initialization 1150 Universe::heap()->post_initialize(); 1151 1152 MemoryService::add_metaspace_memory_pools(); 1153 1154 MemoryService::set_universe_heap(Universe::heap()); 1155 #if INCLUDE_CDS 1156 MetaspaceShared::post_initialize(CHECK_false); 1157 #endif 1158 return true; 1159 } 1160 1161 1162 void Universe::compute_base_vtable_size() { 1163 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1164 } 1165 1166 void Universe::print_on(outputStream* st) { 1167 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1168 st->print_cr("Heap"); 1169 heap()->print_on(st); 1170 } 1171 1172 void Universe::print_heap_at_SIGBREAK() { 1173 if (PrintHeapAtSIGBREAK) { 1174 print_on(tty); 1175 tty->cr(); 1176 tty->flush(); 1177 } 1178 } 1179 1180 void Universe::initialize_verify_flags() { 1181 verify_flags = 0; 1182 const char delimiter[] = " ,"; 1183 1184 size_t length = strlen(VerifySubSet); 1185 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1186 strncpy(subset_list, VerifySubSet, length + 1); 1187 char* save_ptr; 1188 1189 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1190 while (token != nullptr) { 1191 if (strcmp(token, "threads") == 0) { 1192 verify_flags |= Verify_Threads; 1193 } else if (strcmp(token, "heap") == 0) { 1194 verify_flags |= Verify_Heap; 1195 } else if (strcmp(token, "symbol_table") == 0) { 1196 verify_flags |= Verify_SymbolTable; 1197 } else if (strcmp(token, "string_table") == 0) { 1198 verify_flags |= Verify_StringTable; 1199 } else if (strcmp(token, "codecache") == 0) { 1200 verify_flags |= Verify_CodeCache; 1201 } else if (strcmp(token, "dictionary") == 0) { 1202 verify_flags |= Verify_SystemDictionary; 1203 } else if (strcmp(token, "classloader_data_graph") == 0) { 1204 verify_flags |= Verify_ClassLoaderDataGraph; 1205 } else if (strcmp(token, "metaspace") == 0) { 1206 verify_flags |= Verify_MetaspaceUtils; 1207 } else if (strcmp(token, "jni_handles") == 0) { 1208 verify_flags |= Verify_JNIHandles; 1209 } else if (strcmp(token, "codecache_oops") == 0) { 1210 verify_flags |= Verify_CodeCacheOops; 1211 } else if (strcmp(token, "resolved_method_table") == 0) { 1212 verify_flags |= Verify_ResolvedMethodTable; 1213 } else if (strcmp(token, "stringdedup") == 0) { 1214 verify_flags |= Verify_StringDedup; 1215 } else { 1216 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1217 } 1218 token = strtok_r(nullptr, delimiter, &save_ptr); 1219 } 1220 FREE_C_HEAP_ARRAY(char, subset_list); 1221 } 1222 1223 bool Universe::should_verify_subset(uint subset) { 1224 if (verify_flags & subset) { 1225 return true; 1226 } 1227 return false; 1228 } 1229 1230 void Universe::verify(VerifyOption option, const char* prefix) { 1231 COMPILER2_PRESENT( 1232 assert(!DerivedPointerTable::is_active(), 1233 "DPT should not be active during verification " 1234 "(of thread stacks below)"); 1235 ) 1236 1237 Thread* thread = Thread::current(); 1238 ResourceMark rm(thread); 1239 HandleMark hm(thread); // Handles created during verification can be zapped 1240 _verify_count++; 1241 1242 FormatBuffer<> title("Verifying %s", prefix); 1243 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1244 if (should_verify_subset(Verify_Threads)) { 1245 log_debug(gc, verify)("Threads"); 1246 Threads::verify(); 1247 } 1248 if (should_verify_subset(Verify_Heap)) { 1249 log_debug(gc, verify)("Heap"); 1250 heap()->verify(option); 1251 } 1252 if (should_verify_subset(Verify_SymbolTable)) { 1253 log_debug(gc, verify)("SymbolTable"); 1254 SymbolTable::verify(); 1255 } 1256 if (should_verify_subset(Verify_StringTable)) { 1257 log_debug(gc, verify)("StringTable"); 1258 StringTable::verify(); 1259 } 1260 if (should_verify_subset(Verify_CodeCache)) { 1261 log_debug(gc, verify)("CodeCache"); 1262 CodeCache::verify(); 1263 } 1264 if (should_verify_subset(Verify_SystemDictionary)) { 1265 log_debug(gc, verify)("SystemDictionary"); 1266 SystemDictionary::verify(); 1267 } 1268 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1269 log_debug(gc, verify)("ClassLoaderDataGraph"); 1270 ClassLoaderDataGraph::verify(); 1271 } 1272 if (should_verify_subset(Verify_MetaspaceUtils)) { 1273 log_debug(gc, verify)("MetaspaceUtils"); 1274 DEBUG_ONLY(MetaspaceUtils::verify();) 1275 } 1276 if (should_verify_subset(Verify_JNIHandles)) { 1277 log_debug(gc, verify)("JNIHandles"); 1278 JNIHandles::verify(); 1279 } 1280 if (should_verify_subset(Verify_CodeCacheOops)) { 1281 log_debug(gc, verify)("CodeCache Oops"); 1282 CodeCache::verify_oops(); 1283 } 1284 if (should_verify_subset(Verify_ResolvedMethodTable)) { 1285 log_debug(gc, verify)("ResolvedMethodTable Oops"); 1286 ResolvedMethodTable::verify(); 1287 } 1288 if (should_verify_subset(Verify_StringDedup)) { 1289 log_debug(gc, verify)("String Deduplication"); 1290 StringDedup::verify(); 1291 } 1292 } 1293 1294 1295 #ifndef PRODUCT 1296 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1297 assert(low_boundary < high_boundary, "bad interval"); 1298 1299 // decide which low-order bits we require to be clear: 1300 size_t alignSize = MinObjAlignmentInBytes; 1301 size_t min_object_size = CollectedHeap::min_fill_size(); 1302 1303 // make an inclusive limit: 1304 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1305 uintptr_t min = (uintptr_t)low_boundary; 1306 assert(min < max, "bad interval"); 1307 uintptr_t diff = max ^ min; 1308 1309 // throw away enough low-order bits to make the diff vanish 1310 uintptr_t mask = (uintptr_t)(-1); 1311 while ((mask & diff) != 0) 1312 mask <<= 1; 1313 uintptr_t bits = (min & mask); 1314 assert(bits == (max & mask), "correct mask"); 1315 // check an intermediate value between min and max, just to make sure: 1316 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1317 1318 // require address alignment, too: 1319 mask |= (alignSize - 1); 1320 1321 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1322 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1323 } 1324 _verify_oop_mask = mask; 1325 _verify_oop_bits = bits; 1326 } 1327 1328 void Universe::set_verify_data(uintptr_t mask, uintptr_t bits) { 1329 _verify_oop_mask = mask; 1330 _verify_oop_bits = bits; 1331 } 1332 1333 // Oop verification (see MacroAssembler::verify_oop) 1334 1335 uintptr_t Universe::verify_oop_mask() { 1336 return _verify_oop_mask; 1337 } 1338 1339 uintptr_t Universe::verify_oop_bits() { 1340 return _verify_oop_bits; 1341 } 1342 1343 uintptr_t Universe::verify_mark_mask() { 1344 return markWord::lock_mask_in_place; 1345 } 1346 1347 uintptr_t Universe::verify_mark_bits() { 1348 intptr_t mask = verify_mark_mask(); 1349 intptr_t bits = (intptr_t)markWord::prototype().value(); 1350 assert((bits & ~mask) == 0, "no stray header bits"); 1351 return bits; 1352 } 1353 #endif // PRODUCT 1354 1355 #ifdef ASSERT 1356 // Release dummy object(s) at bottom of heap 1357 bool Universe::release_fullgc_alot_dummy() { 1358 MutexLocker ml(FullGCALot_lock); 1359 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve(); 1360 if (fullgc_alot_dummy_array != nullptr) { 1361 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) { 1362 // No more dummies to release, release entire array instead 1363 _fullgc_alot_dummy_array.release(Universe::vm_global()); 1364 _fullgc_alot_dummy_array = OopHandle(); // null out OopStorage pointer. 1365 return false; 1366 } 1367 1368 // Release dummy at bottom of old generation 1369 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, nullptr); 1370 } 1371 return true; 1372 } 1373 1374 bool Universe::is_stw_gc_active() { 1375 return heap()->is_stw_gc_active(); 1376 } 1377 1378 bool Universe::is_in_heap(const void* p) { 1379 return heap()->is_in(p); 1380 } 1381 1382 #endif // ASSERT --- EOF ---