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/klass.inline.hpp" 64 #include "oops/objArrayOop.inline.hpp" 65 #include "oops/objLayout.hpp" 66 #include "oops/oop.inline.hpp" 67 #include "oops/oopHandle.inline.hpp" 68 #include "oops/typeArrayKlass.hpp" 69 #include "prims/resolvedMethodTable.hpp" 70 #include "runtime/arguments.hpp" 71 #include "runtime/atomic.hpp" 72 #include "runtime/cpuTimeCounters.hpp" 73 #include "runtime/flags/jvmFlagLimit.hpp" 74 #include "runtime/handles.inline.hpp" 75 #include "runtime/init.hpp" 76 #include "runtime/java.hpp" 77 #include "runtime/javaThread.hpp" 78 #include "runtime/jniHandles.hpp" 79 #include "runtime/threads.hpp" 80 #include "runtime/timerTrace.hpp" 81 #include "sanitizers/leak.hpp" 82 #include "services/memoryService.hpp" 83 #include "utilities/align.hpp" 84 #include "utilities/autoRestore.hpp" 85 #include "utilities/debug.hpp" 86 #include "utilities/formatBuffer.hpp" 87 #include "utilities/macros.hpp" 88 #include "utilities/ostream.hpp" 89 #include "utilities/preserveException.hpp" 90 91 // A helper class for caching a Method* when the user of the cache 92 // only cares about the latest version of the Method*. This cache safely 93 // interacts with the RedefineClasses API. 94 class LatestMethodCache { 95 // We save the InstanceKlass* and the idnum of Method* in order to get 96 // the current Method*. 97 InstanceKlass* _klass; 98 int _method_idnum; 99 100 public: 101 LatestMethodCache() { _klass = nullptr; _method_idnum = -1; } 102 103 void init(JavaThread* current, InstanceKlass* ik, const char* method, 104 Symbol* signature, bool is_static); 105 Method* get_method(); 106 }; 107 108 static LatestMethodCache _finalizer_register_cache; // Finalizer.register() 109 static LatestMethodCache _loader_addClass_cache; // ClassLoader.addClass() 110 static LatestMethodCache _throw_illegal_access_error_cache; // Unsafe.throwIllegalAccessError() 111 static LatestMethodCache _throw_no_such_method_error_cache; // Unsafe.throwNoSuchMethodError() 112 static LatestMethodCache _do_stack_walk_cache; // AbstractStackWalker.doStackWalk() 113 static LatestMethodCache _is_substitutable_cache; // ValueObjectMethods.isSubstitutable() 114 static LatestMethodCache _value_object_hash_code_cache; // ValueObjectMethods.valueObjectHashCode() 115 116 // Known objects 117 TypeArrayKlass* Universe::_typeArrayKlasses[T_LONG+1] = { nullptr /*, nullptr...*/ }; 118 ObjArrayKlass* Universe::_objectArrayKlass = nullptr; 119 Klass* Universe::_fillerArrayKlass = nullptr; 120 OopHandle Universe::_basic_type_mirrors[T_VOID+1]; 121 #if INCLUDE_CDS_JAVA_HEAP 122 int Universe::_archived_basic_type_mirror_indices[T_VOID+1]; 123 #endif 124 125 OopHandle Universe::_main_thread_group; 126 OopHandle Universe::_system_thread_group; 127 OopHandle Universe::_the_empty_class_array; 128 OopHandle Universe::_the_null_string; 129 OopHandle Universe::_the_min_jint_string; 130 131 OopHandle Universe::_the_null_sentinel; 132 133 // _out_of_memory_errors is an objArray 134 enum OutOfMemoryInstance { _oom_java_heap, 135 _oom_c_heap, 136 _oom_metaspace, 137 _oom_class_metaspace, 138 _oom_array_size, 139 _oom_gc_overhead_limit, 140 _oom_realloc_objects, 141 _oom_count }; 142 143 OopHandle Universe::_out_of_memory_errors; 144 OopHandle Universe:: _class_init_stack_overflow_error; 145 OopHandle Universe::_delayed_stack_overflow_error_message; 146 OopHandle Universe::_preallocated_out_of_memory_error_array; 147 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 148 149 // Message details for OOME objects, preallocate these objects since they could be 150 // used when throwing OOME, we should try to avoid further allocation in such case 151 OopHandle Universe::_msg_metaspace; 152 OopHandle Universe::_msg_class_metaspace; 153 154 OopHandle Universe::_reference_pending_list; 155 156 Array<Klass*>* Universe::_the_array_interfaces_array = nullptr; 157 158 long Universe::verify_flags = Universe::Verify_All; 159 160 Array<int>* Universe::_the_empty_int_array = nullptr; 161 Array<u2>* Universe::_the_empty_short_array = nullptr; 162 Array<Klass*>* Universe::_the_empty_klass_array = nullptr; 163 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = nullptr; 164 Array<Method*>* Universe::_the_empty_method_array = nullptr; 165 166 uintx Universe::_the_array_interfaces_bitmap = 0; 167 uintx Universe::_the_empty_klass_bitmap = 0; 168 169 // These variables are guarded by FullGCALot_lock. 170 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;) 171 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 172 173 // Heap 174 int Universe::_verify_count = 0; 175 176 // Oop verification (see MacroAssembler::verify_oop) 177 uintptr_t Universe::_verify_oop_mask = 0; 178 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 179 180 int Universe::_base_vtable_size = 0; 181 bool Universe::_bootstrapping = false; 182 bool Universe::_module_initialized = false; 183 bool Universe::_fully_initialized = false; 184 185 OopStorage* Universe::_vm_weak = nullptr; 186 OopStorage* Universe::_vm_global = nullptr; 187 188 CollectedHeap* Universe::_collectedHeap = nullptr; 189 190 // These are the exceptions that are always created and are guatanteed to exist. 191 // If possible, they can be stored as CDS archived objects to speed up AOT code. 192 class BuiltinException { 193 OopHandle _instance; 194 CDS_JAVA_HEAP_ONLY(int _archived_root_index;) 195 196 public: 197 BuiltinException() : _instance() { 198 CDS_JAVA_HEAP_ONLY(_archived_root_index = 0); 199 } 200 201 void init_if_empty(Symbol* symbol, TRAPS) { 202 if (_instance.is_empty()) { 203 Klass* k = SystemDictionary::resolve_or_fail(symbol, true, CHECK); 204 oop obj = InstanceKlass::cast(k)->allocate_instance(CHECK); 205 _instance = OopHandle(Universe::vm_global(), obj); 206 } 207 } 208 209 oop instance() { 210 return _instance.resolve(); 211 } 212 213 #if INCLUDE_CDS_JAVA_HEAP 214 void store_in_cds() { 215 _archived_root_index = HeapShared::archive_exception_instance(instance()); 216 } 217 218 void load_from_cds() { 219 if (_archived_root_index >= 0) { 220 oop obj = HeapShared::get_root(_archived_root_index); 221 assert(obj != nullptr, "must be"); 222 _instance = OopHandle(Universe::vm_global(), obj); 223 } 224 } 225 226 void serialize(SerializeClosure *f) { 227 f->do_int(&_archived_root_index); 228 } 229 #endif 230 }; 231 232 static BuiltinException _null_ptr_exception; 233 static BuiltinException _arithmetic_exception; 234 static BuiltinException _internal_error; 235 static BuiltinException _array_index_out_of_bounds_exception; 236 static BuiltinException _array_store_exception; 237 static BuiltinException _class_cast_exception; 238 239 objArrayOop Universe::the_empty_class_array () { 240 return (objArrayOop)_the_empty_class_array.resolve(); 241 } 242 243 oop Universe::main_thread_group() { return _main_thread_group.resolve(); } 244 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); } 245 246 oop Universe::system_thread_group() { return _system_thread_group.resolve(); } 247 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); } 248 249 oop Universe::the_null_string() { return _the_null_string.resolve(); } 250 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); } 251 252 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception.instance(); } 253 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception.instance(); } 254 oop Universe::internal_error_instance() { return _internal_error.instance(); } 255 oop Universe::array_index_out_of_bounds_exception_instance() { return _array_index_out_of_bounds_exception.instance(); } 256 oop Universe::array_store_exception_instance() { return _array_store_exception.instance(); } 257 oop Universe::class_cast_exception_instance() { return _class_cast_exception.instance(); } 258 259 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); } 260 261 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); } 262 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); } 263 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); } 264 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); } 265 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); } 266 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); } 267 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); } 268 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); } 269 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); } 270 271 oop Universe::java_mirror(BasicType t) { 272 assert((uint)t < T_VOID+1, "range check"); 273 assert(!is_reference_type(t), "sanity"); 274 return check_mirror(_basic_type_mirrors[t].resolve()); 275 } 276 277 void Universe::basic_type_classes_do(KlassClosure *closure) { 278 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 279 closure->do_klass(_typeArrayKlasses[i]); 280 } 281 // We don't do the following because it will confuse JVMTI. 282 // _fillerArrayKlass is used only by GC, which doesn't need to see 283 // this klass from basic_type_classes_do(). 284 // 285 // closure->do_klass(_fillerArrayKlass); 286 } 287 288 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 289 it->push(&_fillerArrayKlass); 290 for (int i = 0; i < T_LONG+1; i++) { 291 it->push(&_typeArrayKlasses[i]); 292 } 293 it->push(&_objectArrayKlass); 294 295 it->push(&_the_empty_int_array); 296 it->push(&_the_empty_short_array); 297 it->push(&_the_empty_klass_array); 298 it->push(&_the_empty_instance_klass_array); 299 it->push(&_the_empty_method_array); 300 it->push(&_the_array_interfaces_array); 301 } 302 303 #if INCLUDE_CDS_JAVA_HEAP 304 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) { 305 assert(CDSConfig::is_dumping_heap(), "sanity"); 306 assert(!is_reference_type(t), "sanity"); 307 _archived_basic_type_mirror_indices[t] = index; 308 } 309 310 void Universe::archive_exception_instances() { 311 _null_ptr_exception.store_in_cds(); 312 _arithmetic_exception.store_in_cds(); 313 _internal_error.store_in_cds(); 314 _array_index_out_of_bounds_exception.store_in_cds(); 315 _array_store_exception.store_in_cds(); 316 _class_cast_exception.store_in_cds(); 317 } 318 319 void Universe::load_archived_object_instances() { 320 if (ArchiveHeapLoader::is_in_use()) { 321 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 322 int index = _archived_basic_type_mirror_indices[i]; 323 if (!is_reference_type((BasicType)i) && index >= 0) { 324 oop mirror_oop = HeapShared::get_root(index); 325 assert(mirror_oop != nullptr, "must be"); 326 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop); 327 } 328 } 329 330 _null_ptr_exception.load_from_cds(); 331 _arithmetic_exception.load_from_cds(); 332 _internal_error.load_from_cds(); 333 _array_index_out_of_bounds_exception.load_from_cds(); 334 _array_store_exception.load_from_cds(); 335 _class_cast_exception.load_from_cds(); 336 } 337 } 338 #endif 339 340 void Universe::serialize(SerializeClosure* f) { 341 342 #if INCLUDE_CDS_JAVA_HEAP 343 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 344 f->do_int(&_archived_basic_type_mirror_indices[i]); 345 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap 346 // contents may need to be relocated. _basic_type_mirrors[i] will be 347 // updated later in Universe::load_archived_object_instances(). 348 } 349 _null_ptr_exception.serialize(f); 350 _arithmetic_exception.serialize(f); 351 _internal_error.serialize(f); 352 _array_index_out_of_bounds_exception.serialize(f); 353 _array_store_exception.serialize(f); 354 _class_cast_exception.serialize(f); 355 #endif 356 357 f->do_ptr(&_fillerArrayKlass); 358 for (int i = 0; i < T_LONG+1; i++) { 359 f->do_ptr(&_typeArrayKlasses[i]); 360 } 361 362 f->do_ptr(&_objectArrayKlass); 363 f->do_ptr(&_the_array_interfaces_array); 364 f->do_ptr(&_the_empty_int_array); 365 f->do_ptr(&_the_empty_short_array); 366 f->do_ptr(&_the_empty_method_array); 367 f->do_ptr(&_the_empty_klass_array); 368 f->do_ptr(&_the_empty_instance_klass_array); 369 } 370 371 372 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 373 if (size < alignment || size % alignment != 0) { 374 vm_exit_during_initialization( 375 err_msg("Size of %s (%zu bytes) must be aligned to %zu bytes", name, size, alignment)); 376 } 377 } 378 379 static void initialize_basic_type_klass(Klass* k, TRAPS) { 380 Klass* ok = vmClasses::Object_klass(); 381 #if INCLUDE_CDS 382 if (CDSConfig::is_using_archive()) { 383 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 384 assert(k->super() == ok, "u3"); 385 if (k->is_instance_klass()) { 386 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), nullptr, CHECK); 387 } else { 388 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK); 389 } 390 } else 391 #endif 392 { 393 k->initialize_supers(ok, nullptr, CHECK); 394 } 395 k->append_to_sibling_list(); 396 } 397 398 void Universe::genesis(TRAPS) { 399 ResourceMark rm(THREAD); 400 HandleMark hm(THREAD); 401 402 // Explicit null checks are needed if these offsets are not smaller than the page size 403 if (UseCompactObjectHeaders) { 404 assert(oopDesc::mark_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()), 405 "Mark offset is expected to be less than the page size"); 406 } else { 407 assert(oopDesc::klass_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()), 408 "Klass offset is expected to be less than the page size"); 409 } 410 assert(arrayOopDesc::length_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()), 411 "Array length offset is expected to be less than the page size"); 412 413 { AutoModifyRestore<bool> temporarily(_bootstrapping, true); 414 415 java_lang_Class::allocate_fixup_lists(); 416 417 // determine base vtable size; without that we cannot create the array klasses 418 compute_base_vtable_size(); 419 420 if (!CDSConfig::is_using_archive()) { 421 // Initialization of the fillerArrayKlass must come before regular 422 // int-TypeArrayKlass so that the int-Array mirror points to the 423 // int-TypeArrayKlass. 424 _fillerArrayKlass = TypeArrayKlass::create_klass(T_INT, "[Ljdk/internal/vm/FillerElement;", CHECK); 425 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 426 _typeArrayKlasses[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 427 } 428 429 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 430 431 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, nullptr, CHECK); 432 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 433 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 434 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 435 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 436 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 437 } 438 439 vmSymbols::initialize(); 440 441 SystemDictionary::initialize(CHECK); 442 443 // Create string constants 444 oop s = StringTable::intern("null", CHECK); 445 _the_null_string = OopHandle(vm_global(), s); 446 s = StringTable::intern("-2147483648", CHECK); 447 _the_min_jint_string = OopHandle(vm_global(), s); 448 449 450 #if INCLUDE_CDS 451 if (CDSConfig::is_using_archive()) { 452 // Verify shared interfaces array. 453 assert(_the_array_interfaces_array->at(0) == 454 vmClasses::Cloneable_klass(), "u3"); 455 assert(_the_array_interfaces_array->at(1) == 456 vmClasses::Serializable_klass(), "u3"); 457 458 } 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 // Initialize performance counters for metaspaces 892 MetaspaceCounters::initialize_performance_counters(); 893 894 // Checks 'AfterMemoryInit' constraints. 895 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) { 896 return JNI_EINVAL; 897 } 898 899 ClassLoaderData::init_null_class_loader_data(); 900 901 #if INCLUDE_CDS 902 if (CDSConfig::is_using_archive()) { 903 // Read the data structures supporting the shared spaces (shared 904 // system dictionary, symbol table, etc.) 905 MetaspaceShared::initialize_shared_spaces(); 906 } 907 if (CDSConfig::is_dumping_archive()) { 908 CDSConfig::prepare_for_dumping(); 909 } 910 #endif 911 912 SymbolTable::create_table(); 913 StringTable::create_table(); 914 915 if (strlen(VerifySubSet) > 0) { 916 Universe::initialize_verify_flags(); 917 } 918 919 ResolvedMethodTable::create_table(); 920 921 return JNI_OK; 922 } 923 924 jint Universe::initialize_heap() { 925 assert(_collectedHeap == nullptr, "Heap already created"); 926 _collectedHeap = GCConfig::arguments()->create_heap(); 927 928 log_info(gc)("Using %s", _collectedHeap->name()); 929 return _collectedHeap->initialize(); 930 } 931 932 void Universe::initialize_tlab() { 933 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 934 PLAB::startup_initialization(); 935 if (UseTLAB) { 936 ThreadLocalAllocBuffer::startup_initialization(); 937 } 938 } 939 940 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 941 942 assert(alignment <= Arguments::conservative_max_heap_alignment(), 943 "actual alignment %zu must be within maximum heap alignment %zu", 944 alignment, Arguments::conservative_max_heap_alignment()); 945 946 size_t total_reserved = align_up(heap_size, alignment); 947 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 948 "heap size is too big for compressed oops"); 949 950 size_t page_size = os::vm_page_size(); 951 if (UseLargePages && is_aligned(alignment, os::large_page_size())) { 952 page_size = os::large_page_size(); 953 } else { 954 // Parallel is the only collector that might opt out of using large pages 955 // for the heap. 956 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages"); 957 } 958 959 // Now create the space. 960 ReservedHeapSpace rhs = HeapReserver::reserve(total_reserved, alignment, page_size, AllocateHeapAt); 961 962 if (!rhs.is_reserved()) { 963 vm_exit_during_initialization( 964 err_msg("Could not reserve enough space for %zu KB object heap", 965 total_reserved/K)); 966 } 967 968 assert(total_reserved == rhs.size(), "must be exactly of required size"); 969 assert(is_aligned(rhs.base(),alignment),"must be exactly of required alignment"); 970 971 assert(markWord::encode_pointer_as_mark(rhs.base()).decode_pointer() == rhs.base(), 972 "area must be distinguishable from marks for mark-sweep"); 973 assert(markWord::encode_pointer_as_mark(&rhs.base()[rhs.size()]).decode_pointer() == 974 &rhs.base()[rhs.size()], 975 "area must be distinguishable from marks for mark-sweep"); 976 977 // We are good. 978 979 if (AllocateHeapAt != nullptr) { 980 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 981 } 982 983 if (UseCompressedOops) { 984 CompressedOops::initialize(rhs); 985 } 986 987 Universe::calculate_verify_data((HeapWord*)rhs.base(), (HeapWord*)rhs.end()); 988 989 return rhs; 990 } 991 992 OopStorage* Universe::vm_weak() { 993 return Universe::_vm_weak; 994 } 995 996 OopStorage* Universe::vm_global() { 997 return Universe::_vm_global; 998 } 999 1000 void Universe::oopstorage_init() { 1001 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal); 1002 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal); 1003 } 1004 1005 void universe_oopstorage_init() { 1006 Universe::oopstorage_init(); 1007 } 1008 1009 void LatestMethodCache::init(JavaThread* current, InstanceKlass* ik, 1010 const char* method, Symbol* signature, bool is_static) 1011 { 1012 TempNewSymbol name = SymbolTable::new_symbol(method); 1013 Method* m = nullptr; 1014 // The klass must be linked before looking up the method. 1015 if (!ik->link_class_or_fail(current) || 1016 ((m = ik->find_method(name, signature)) == nullptr) || 1017 is_static != m->is_static()) { 1018 ResourceMark rm(current); 1019 // NoSuchMethodException doesn't actually work because it tries to run the 1020 // <init> function before java_lang_Class is linked. Print error and exit. 1021 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 1022 ik->name()->as_C_string(), method)); 1023 } 1024 1025 _klass = ik; 1026 _method_idnum = m->method_idnum(); 1027 assert(_method_idnum >= 0, "sanity check"); 1028 } 1029 1030 Method* LatestMethodCache::get_method() { 1031 if (_klass == nullptr) { 1032 return nullptr; 1033 } else { 1034 Method* m = _klass->method_with_idnum(_method_idnum); 1035 assert(m != nullptr, "sanity check"); 1036 return m; 1037 } 1038 } 1039 1040 Method* Universe::finalizer_register_method() { return _finalizer_register_cache.get_method(); } 1041 Method* Universe::loader_addClass_method() { return _loader_addClass_cache.get_method(); } 1042 Method* Universe::throw_illegal_access_error() { return _throw_illegal_access_error_cache.get_method(); } 1043 Method* Universe::throw_no_such_method_error() { return _throw_no_such_method_error_cache.get_method(); } 1044 Method* Universe::do_stack_walk_method() { return _do_stack_walk_cache.get_method(); } 1045 Method* Universe::is_substitutable_method() { return _is_substitutable_cache.get_method(); } 1046 Method* Universe::value_object_hash_code_method() { return _value_object_hash_code_cache.get_method(); } 1047 1048 void Universe::initialize_known_methods(JavaThread* current) { 1049 // Set up static method for registering finalizers 1050 _finalizer_register_cache.init(current, 1051 vmClasses::Finalizer_klass(), 1052 "register", 1053 vmSymbols::object_void_signature(), true); 1054 1055 _throw_illegal_access_error_cache.init(current, 1056 vmClasses::internal_Unsafe_klass(), 1057 "throwIllegalAccessError", 1058 vmSymbols::void_method_signature(), true); 1059 1060 _throw_no_such_method_error_cache.init(current, 1061 vmClasses::internal_Unsafe_klass(), 1062 "throwNoSuchMethodError", 1063 vmSymbols::void_method_signature(), true); 1064 1065 // Set up method for registering loaded classes in class loader vector 1066 _loader_addClass_cache.init(current, 1067 vmClasses::ClassLoader_klass(), 1068 "addClass", 1069 vmSymbols::class_void_signature(), false); 1070 1071 // Set up method for stack walking 1072 _do_stack_walk_cache.init(current, 1073 vmClasses::AbstractStackWalker_klass(), 1074 "doStackWalk", 1075 vmSymbols::doStackWalk_signature(), false); 1076 1077 // Set up substitutability testing 1078 ResourceMark rm(current); 1079 _is_substitutable_cache.init(current, 1080 vmClasses::ValueObjectMethods_klass(), 1081 vmSymbols::isSubstitutable_name()->as_C_string(), 1082 vmSymbols::object_object_boolean_signature(), true); 1083 _value_object_hash_code_cache.init(current, 1084 vmClasses::ValueObjectMethods_klass(), 1085 vmSymbols::valueObjectHashCode_name()->as_C_string(), 1086 vmSymbols::object_int_signature(), true); 1087 } 1088 1089 void universe2_init() { 1090 EXCEPTION_MARK; 1091 Universe::genesis(CATCH); 1092 } 1093 1094 // Set after initialization of the module runtime, call_initModuleRuntime 1095 void universe_post_module_init() { 1096 Universe::_module_initialized = true; 1097 } 1098 1099 bool universe_post_init() { 1100 assert(!is_init_completed(), "Error: initialization not yet completed!"); 1101 Universe::_fully_initialized = true; 1102 EXCEPTION_MARK; 1103 if (!CDSConfig::is_using_archive()) { 1104 reinitialize_vtables(); 1105 reinitialize_itables(); 1106 } 1107 1108 HandleMark hm(THREAD); 1109 // Setup preallocated empty java.lang.Class array for Method reflection. 1110 1111 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false); 1112 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array); 1113 1114 // Setup preallocated OutOfMemoryError errors 1115 Universe::create_preallocated_out_of_memory_errors(CHECK_false); 1116 1117 oop instance; 1118 // Setup preallocated cause message for delayed StackOverflowError 1119 if (StackReservedPages > 0) { 1120 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1121 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance); 1122 } 1123 1124 // Setup preallocated exceptions used for a cheap & dirty solution in compiler exception handling 1125 _null_ptr_exception.init_if_empty(vmSymbols::java_lang_NullPointerException(), CHECK_false); 1126 _arithmetic_exception.init_if_empty(vmSymbols::java_lang_ArithmeticException(), CHECK_false); 1127 _array_index_out_of_bounds_exception.init_if_empty(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), CHECK_false); 1128 _array_store_exception.init_if_empty(vmSymbols::java_lang_ArrayStoreException(), CHECK_false); 1129 _class_cast_exception.init_if_empty(vmSymbols::java_lang_ClassCastException(), CHECK_false); 1130 1131 // Virtual Machine Error for when we get into a situation we can't resolve 1132 Klass* k = vmClasses::InternalError_klass(); 1133 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1134 if (!linked) { 1135 tty->print_cr("Unable to link/verify InternalError class"); 1136 return false; // initialization failed 1137 } 1138 _internal_error.init_if_empty(vmSymbols::java_lang_InternalError(), CHECK_false); 1139 1140 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1141 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg()); 1142 1143 // Setup preallocated StackOverflowError for use with class initialization failure 1144 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackOverflowError(), true, CHECK_false); 1145 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1146 Universe::_class_init_stack_overflow_error = OopHandle(Universe::vm_global(), instance); 1147 1148 Universe::initialize_known_methods(THREAD); 1149 1150 // This needs to be done before the first scavenge/gc, since 1151 // it's an input to soft ref clearing policy. 1152 { 1153 MutexLocker x(THREAD, Heap_lock); 1154 Universe::heap()->update_capacity_and_used_at_gc(); 1155 } 1156 1157 // ("weak") refs processing infrastructure initialization 1158 Universe::heap()->post_initialize(); 1159 1160 MemoryService::add_metaspace_memory_pools(); 1161 1162 MemoryService::set_universe_heap(Universe::heap()); 1163 #if INCLUDE_CDS 1164 MetaspaceShared::post_initialize(CHECK_false); 1165 #endif 1166 return true; 1167 } 1168 1169 1170 void Universe::compute_base_vtable_size() { 1171 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1172 } 1173 1174 void Universe::print_on(outputStream* st) { 1175 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1176 st->print_cr("Heap"); 1177 heap()->print_on(st); 1178 } 1179 1180 void Universe::print_heap_at_SIGBREAK() { 1181 if (PrintHeapAtSIGBREAK) { 1182 print_on(tty); 1183 tty->cr(); 1184 tty->flush(); 1185 } 1186 } 1187 1188 void Universe::initialize_verify_flags() { 1189 verify_flags = 0; 1190 const char delimiter[] = " ,"; 1191 1192 size_t length = strlen(VerifySubSet); 1193 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1194 strncpy(subset_list, VerifySubSet, length + 1); 1195 char* save_ptr; 1196 1197 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1198 while (token != nullptr) { 1199 if (strcmp(token, "threads") == 0) { 1200 verify_flags |= Verify_Threads; 1201 } else if (strcmp(token, "heap") == 0) { 1202 verify_flags |= Verify_Heap; 1203 } else if (strcmp(token, "symbol_table") == 0) { 1204 verify_flags |= Verify_SymbolTable; 1205 } else if (strcmp(token, "string_table") == 0) { 1206 verify_flags |= Verify_StringTable; 1207 } else if (strcmp(token, "codecache") == 0) { 1208 verify_flags |= Verify_CodeCache; 1209 } else if (strcmp(token, "dictionary") == 0) { 1210 verify_flags |= Verify_SystemDictionary; 1211 } else if (strcmp(token, "classloader_data_graph") == 0) { 1212 verify_flags |= Verify_ClassLoaderDataGraph; 1213 } else if (strcmp(token, "metaspace") == 0) { 1214 verify_flags |= Verify_MetaspaceUtils; 1215 } else if (strcmp(token, "jni_handles") == 0) { 1216 verify_flags |= Verify_JNIHandles; 1217 } else if (strcmp(token, "codecache_oops") == 0) { 1218 verify_flags |= Verify_CodeCacheOops; 1219 } else if (strcmp(token, "resolved_method_table") == 0) { 1220 verify_flags |= Verify_ResolvedMethodTable; 1221 } else if (strcmp(token, "stringdedup") == 0) { 1222 verify_flags |= Verify_StringDedup; 1223 } else { 1224 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1225 } 1226 token = strtok_r(nullptr, delimiter, &save_ptr); 1227 } 1228 FREE_C_HEAP_ARRAY(char, subset_list); 1229 } 1230 1231 bool Universe::should_verify_subset(uint subset) { 1232 if (verify_flags & subset) { 1233 return true; 1234 } 1235 return false; 1236 } 1237 1238 void Universe::verify(VerifyOption option, const char* prefix) { 1239 COMPILER2_PRESENT( 1240 assert(!DerivedPointerTable::is_active(), 1241 "DPT should not be active during verification " 1242 "(of thread stacks below)"); 1243 ) 1244 1245 Thread* thread = Thread::current(); 1246 ResourceMark rm(thread); 1247 HandleMark hm(thread); // Handles created during verification can be zapped 1248 _verify_count++; 1249 1250 FormatBuffer<> title("Verifying %s", prefix); 1251 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1252 if (should_verify_subset(Verify_Threads)) { 1253 log_debug(gc, verify)("Threads"); 1254 Threads::verify(); 1255 } 1256 if (should_verify_subset(Verify_Heap)) { 1257 log_debug(gc, verify)("Heap"); 1258 heap()->verify(option); 1259 } 1260 if (should_verify_subset(Verify_SymbolTable)) { 1261 log_debug(gc, verify)("SymbolTable"); 1262 SymbolTable::verify(); 1263 } 1264 if (should_verify_subset(Verify_StringTable)) { 1265 log_debug(gc, verify)("StringTable"); 1266 StringTable::verify(); 1267 } 1268 if (should_verify_subset(Verify_CodeCache)) { 1269 log_debug(gc, verify)("CodeCache"); 1270 CodeCache::verify(); 1271 } 1272 if (should_verify_subset(Verify_SystemDictionary)) { 1273 log_debug(gc, verify)("SystemDictionary"); 1274 SystemDictionary::verify(); 1275 } 1276 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1277 log_debug(gc, verify)("ClassLoaderDataGraph"); 1278 ClassLoaderDataGraph::verify(); 1279 } 1280 if (should_verify_subset(Verify_MetaspaceUtils)) { 1281 log_debug(gc, verify)("MetaspaceUtils"); 1282 DEBUG_ONLY(MetaspaceUtils::verify();) 1283 } 1284 if (should_verify_subset(Verify_JNIHandles)) { 1285 log_debug(gc, verify)("JNIHandles"); 1286 JNIHandles::verify(); 1287 } 1288 if (should_verify_subset(Verify_CodeCacheOops)) { 1289 log_debug(gc, verify)("CodeCache Oops"); 1290 CodeCache::verify_oops(); 1291 } 1292 if (should_verify_subset(Verify_ResolvedMethodTable)) { 1293 log_debug(gc, verify)("ResolvedMethodTable Oops"); 1294 ResolvedMethodTable::verify(); 1295 } 1296 if (should_verify_subset(Verify_StringDedup)) { 1297 log_debug(gc, verify)("String Deduplication"); 1298 StringDedup::verify(); 1299 } 1300 } 1301 1302 1303 #ifndef PRODUCT 1304 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1305 assert(low_boundary < high_boundary, "bad interval"); 1306 1307 // decide which low-order bits we require to be clear: 1308 size_t alignSize = MinObjAlignmentInBytes; 1309 size_t min_object_size = CollectedHeap::min_fill_size(); 1310 1311 // make an inclusive limit: 1312 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1313 uintptr_t min = (uintptr_t)low_boundary; 1314 assert(min < max, "bad interval"); 1315 uintptr_t diff = max ^ min; 1316 1317 // throw away enough low-order bits to make the diff vanish 1318 uintptr_t mask = (uintptr_t)(-1); 1319 while ((mask & diff) != 0) 1320 mask <<= 1; 1321 uintptr_t bits = (min & mask); 1322 assert(bits == (max & mask), "correct mask"); 1323 // check an intermediate value between min and max, just to make sure: 1324 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1325 1326 // require address alignment, too: 1327 mask |= (alignSize - 1); 1328 1329 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1330 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1331 } 1332 _verify_oop_mask = mask; 1333 _verify_oop_bits = bits; 1334 } 1335 1336 void Universe::set_verify_data(uintptr_t mask, uintptr_t bits) { 1337 _verify_oop_mask = mask; 1338 _verify_oop_bits = bits; 1339 } 1340 1341 // Oop verification (see MacroAssembler::verify_oop) 1342 1343 uintptr_t Universe::verify_oop_mask() { 1344 return _verify_oop_mask; 1345 } 1346 1347 uintptr_t Universe::verify_oop_bits() { 1348 return _verify_oop_bits; 1349 } 1350 1351 uintptr_t Universe::verify_mark_mask() { 1352 return markWord::lock_mask_in_place; 1353 } 1354 1355 uintptr_t Universe::verify_mark_bits() { 1356 intptr_t mask = verify_mark_mask(); 1357 intptr_t bits = (intptr_t)markWord::prototype().value(); 1358 assert((bits & ~mask) == 0, "no stray header bits"); 1359 return bits; 1360 } 1361 #endif // PRODUCT 1362 1363 #ifdef ASSERT 1364 // Release dummy object(s) at bottom of heap 1365 bool Universe::release_fullgc_alot_dummy() { 1366 MutexLocker ml(FullGCALot_lock); 1367 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve(); 1368 if (fullgc_alot_dummy_array != nullptr) { 1369 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) { 1370 // No more dummies to release, release entire array instead 1371 _fullgc_alot_dummy_array.release(Universe::vm_global()); 1372 _fullgc_alot_dummy_array = OopHandle(); // null out OopStorage pointer. 1373 return false; 1374 } 1375 1376 // Release dummy at bottom of old generation 1377 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, nullptr); 1378 } 1379 return true; 1380 } 1381 1382 bool Universe::is_stw_gc_active() { 1383 return heap()->is_stw_gc_active(); 1384 } 1385 1386 bool Universe::is_in_heap(const void* p) { 1387 return heap()->is_in(p); 1388 } 1389 1390 #endif // ASSERT