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