1 /* 2 * Copyright (c) 1997, 2023, 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/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/metadataFactory.hpp" 53 #include "memory/metaspaceClosure.hpp" 54 #include "memory/metaspaceCounters.hpp" 55 #include "memory/metaspaceUtils.hpp" 56 #include "memory/oopFactory.hpp" 57 #include "memory/resourceArea.hpp" 58 #include "memory/universe.hpp" 59 #include "oops/compressedOops.hpp" 60 #include "oops/instanceKlass.hpp" 61 #include "oops/instanceMirrorKlass.hpp" 62 #include "oops/klass.inline.hpp" 63 #include "oops/objArrayOop.inline.hpp" 64 #include "oops/oop.inline.hpp" 65 #include "oops/oopHandle.inline.hpp" 66 #include "oops/typeArrayKlass.hpp" 67 #include "prims/resolvedMethodTable.hpp" 68 #include "runtime/arguments.hpp" 69 #include "runtime/atomic.hpp" 70 #include "runtime/flags/jvmFlagLimit.hpp" 71 #include "runtime/handles.inline.hpp" 72 #include "runtime/init.hpp" 73 #include "runtime/java.hpp" 74 #include "runtime/javaThread.hpp" 75 #include "runtime/jniHandles.hpp" 76 #include "runtime/threads.hpp" 77 #include "runtime/timerTrace.hpp" 78 #include "sanitizers/leak.hpp" 79 #include "services/memoryService.hpp" 80 #include "utilities/align.hpp" 81 #include "utilities/autoRestore.hpp" 82 #include "utilities/debug.hpp" 83 #include "utilities/formatBuffer.hpp" 84 #include "utilities/macros.hpp" 85 #include "utilities/ostream.hpp" 86 #include "utilities/preserveException.hpp" 87 88 // Known objects 89 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { nullptr /*, nullptr...*/ }; 90 Klass* Universe::_objectArrayKlassObj = nullptr; 91 Klass* Universe::_fillerArrayKlassObj = nullptr; 92 OopHandle Universe::_basic_type_mirrors[T_VOID+1]; 93 #if INCLUDE_CDS_JAVA_HEAP 94 int Universe::_archived_basic_type_mirror_indices[T_VOID+1]; 95 #endif 96 97 OopHandle Universe::_main_thread_group; 98 OopHandle Universe::_system_thread_group; 99 OopHandle Universe::_the_empty_class_array; 100 OopHandle Universe::_the_null_string; 101 OopHandle Universe::_the_min_jint_string; 102 103 OopHandle Universe::_the_null_sentinel; 104 105 // _out_of_memory_errors is an objArray 106 enum OutOfMemoryInstance { _oom_java_heap, 107 _oom_c_heap, 108 _oom_metaspace, 109 _oom_class_metaspace, 110 _oom_array_size, 111 _oom_gc_overhead_limit, 112 _oom_realloc_objects, 113 _oom_retry, 114 _oom_count }; 115 116 OopHandle Universe::_out_of_memory_errors; 117 OopHandle Universe:: _class_init_stack_overflow_error; 118 OopHandle Universe::_delayed_stack_overflow_error_message; 119 OopHandle Universe::_preallocated_out_of_memory_error_array; 120 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 121 122 // Message details for OOME objects, preallocate these objects since they could be 123 // used when throwing OOME, we should try to avoid further allocation in such case 124 OopHandle Universe::_msg_metaspace; 125 OopHandle Universe::_msg_class_metaspace; 126 127 OopHandle Universe::_null_ptr_exception_instance; 128 OopHandle Universe::_arithmetic_exception_instance; 129 OopHandle Universe::_virtual_machine_error_instance; 130 131 OopHandle Universe::_reference_pending_list; 132 133 Array<Klass*>* Universe::_the_array_interfaces_array = nullptr; 134 LatestMethodCache* Universe::_finalizer_register_cache = nullptr; 135 LatestMethodCache* Universe::_loader_addClass_cache = nullptr; 136 LatestMethodCache* Universe::_throw_illegal_access_error_cache = nullptr; 137 LatestMethodCache* Universe::_throw_no_such_method_error_cache = nullptr; 138 LatestMethodCache* Universe::_do_stack_walk_cache = nullptr; 139 140 long Universe::verify_flags = Universe::Verify_All; 141 142 Array<int>* Universe::_the_empty_int_array = nullptr; 143 Array<u2>* Universe::_the_empty_short_array = nullptr; 144 Array<Klass*>* Universe::_the_empty_klass_array = nullptr; 145 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = nullptr; 146 Array<Method*>* Universe::_the_empty_method_array = nullptr; 147 148 // These variables are guarded by FullGCALot_lock. 149 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;) 150 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 151 152 // Heap 153 int Universe::_verify_count = 0; 154 155 // Oop verification (see MacroAssembler::verify_oop) 156 uintptr_t Universe::_verify_oop_mask = 0; 157 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 158 159 int Universe::_base_vtable_size = 0; 160 bool Universe::_bootstrapping = false; 161 bool Universe::_module_initialized = false; 162 bool Universe::_fully_initialized = false; 163 164 OopStorage* Universe::_vm_weak = nullptr; 165 OopStorage* Universe::_vm_global = nullptr; 166 167 CollectedHeap* Universe::_collectedHeap = nullptr; 168 169 objArrayOop Universe::the_empty_class_array () { 170 return (objArrayOop)_the_empty_class_array.resolve(); 171 } 172 173 oop Universe::main_thread_group() { return _main_thread_group.resolve(); } 174 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); } 175 176 oop Universe::system_thread_group() { return _system_thread_group.resolve(); } 177 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); } 178 179 oop Universe::the_null_string() { return _the_null_string.resolve(); } 180 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); } 181 182 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); } 183 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); } 184 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); } 185 186 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); } 187 188 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); } 189 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); } 190 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); } 191 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); } 192 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); } 193 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); } 194 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); } 195 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); } 196 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); } 197 198 oop Universe::java_mirror(BasicType t) { 199 assert((uint)t < T_VOID+1, "range check"); 200 assert(!is_reference_type(t), "sanity"); 201 return check_mirror(_basic_type_mirrors[t].resolve()); 202 } 203 204 void Universe::basic_type_classes_do(KlassClosure *closure) { 205 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 206 closure->do_klass(_typeArrayKlassObjs[i]); 207 } 208 // We don't do the following because it will confuse JVMTI. 209 // _fillerArrayKlassObj is used only by GC, which doesn't need to see 210 // this klass from basic_type_classes_do(). 211 // 212 // closure->do_klass(_fillerArrayKlassObj); 213 } 214 215 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 216 it->push(&_klass); 217 } 218 219 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 220 it->push(&_fillerArrayKlassObj); 221 for (int i = 0; i < T_LONG+1; i++) { 222 it->push(&_typeArrayKlassObjs[i]); 223 } 224 it->push(&_objectArrayKlassObj); 225 226 it->push(&_the_empty_int_array); 227 it->push(&_the_empty_short_array); 228 it->push(&_the_empty_klass_array); 229 it->push(&_the_empty_instance_klass_array); 230 it->push(&_the_empty_method_array); 231 it->push(&_the_array_interfaces_array); 232 233 _finalizer_register_cache->metaspace_pointers_do(it); 234 _loader_addClass_cache->metaspace_pointers_do(it); 235 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 236 _throw_no_such_method_error_cache->metaspace_pointers_do(it); 237 _do_stack_walk_cache->metaspace_pointers_do(it); 238 } 239 240 #if INCLUDE_CDS_JAVA_HEAP 241 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) { 242 assert(DumpSharedSpaces, "dump-time only"); 243 assert(!is_reference_type(t), "sanity"); 244 _archived_basic_type_mirror_indices[t] = index; 245 } 246 247 void Universe::update_archived_basic_type_mirrors() { 248 if (ArchiveHeapLoader::is_in_use()) { 249 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 250 int index = _archived_basic_type_mirror_indices[i]; 251 if (!is_reference_type((BasicType)i) && index >= 0) { 252 oop mirror_oop = HeapShared::get_root(index); 253 assert(mirror_oop != nullptr, "must be"); 254 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop); 255 } 256 } 257 } 258 } 259 #endif 260 261 void Universe::serialize(SerializeClosure* f) { 262 263 #if INCLUDE_CDS_JAVA_HEAP 264 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 265 f->do_int(&_archived_basic_type_mirror_indices[i]); 266 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap 267 // contents may need to be relocated. _basic_type_mirrors[i] will be 268 // updated later in Universe::update_archived_basic_type_mirrors(). 269 } 270 #endif 271 272 f->do_ptr(&_fillerArrayKlassObj); 273 for (int i = 0; i < T_LONG+1; i++) { 274 f->do_ptr(&_typeArrayKlassObjs[i]); 275 } 276 277 f->do_ptr(&_objectArrayKlassObj); 278 f->do_ptr(&_the_array_interfaces_array); 279 f->do_ptr(&_the_empty_int_array); 280 f->do_ptr(&_the_empty_short_array); 281 f->do_ptr(&_the_empty_method_array); 282 f->do_ptr(&_the_empty_klass_array); 283 f->do_ptr(&_the_empty_instance_klass_array); 284 _finalizer_register_cache->serialize(f); 285 _loader_addClass_cache->serialize(f); 286 _throw_illegal_access_error_cache->serialize(f); 287 _throw_no_such_method_error_cache->serialize(f); 288 _do_stack_walk_cache->serialize(f); 289 } 290 291 292 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 293 if (size < alignment || size % alignment != 0) { 294 vm_exit_during_initialization( 295 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 296 } 297 } 298 299 void initialize_basic_type_klass(Klass* k, TRAPS) { 300 Klass* ok = vmClasses::Object_klass(); 301 #if INCLUDE_CDS 302 if (UseSharedSpaces) { 303 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 304 assert(k->super() == ok, "u3"); 305 if (k->is_instance_klass()) { 306 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), nullptr, CHECK); 307 } else { 308 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK); 309 } 310 } else 311 #endif 312 { 313 k->initialize_supers(ok, nullptr, CHECK); 314 } 315 k->append_to_sibling_list(); 316 } 317 318 void Universe::genesis(TRAPS) { 319 ResourceMark rm(THREAD); 320 HandleMark hm(THREAD); 321 322 // Explicit null checks are needed if these offsets are not smaller than the page size 323 assert(oopDesc::klass_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()), 324 "Klass offset is expected to be less than the page size"); 325 assert(arrayOopDesc::length_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()), 326 "Array length offset is expected to be less than the page size"); 327 328 { AutoModifyRestore<bool> temporarily(_bootstrapping, true); 329 330 java_lang_Class::allocate_fixup_lists(); 331 332 // determine base vtable size; without that we cannot create the array klasses 333 compute_base_vtable_size(); 334 335 if (!UseSharedSpaces) { 336 // Initialization of the fillerArrayKlass must come before regular 337 // int-TypeArrayKlass so that the int-Array mirror points to the 338 // int-TypeArrayKlass. 339 _fillerArrayKlassObj = TypeArrayKlass::create_klass(T_INT, "Ljdk/internal/vm/FillerArray;", CHECK); 340 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 341 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 342 } 343 344 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 345 346 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, nullptr, CHECK); 347 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 348 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 349 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 350 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 351 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 352 } 353 354 vmSymbols::initialize(); 355 356 SystemDictionary::initialize(CHECK); 357 358 // Create string constants 359 oop s = StringTable::intern("null", CHECK); 360 _the_null_string = OopHandle(vm_global(), s); 361 s = StringTable::intern("-2147483648", CHECK); 362 _the_min_jint_string = OopHandle(vm_global(), s); 363 364 365 #if INCLUDE_CDS 366 if (UseSharedSpaces) { 367 // Verify shared interfaces array. 368 assert(_the_array_interfaces_array->at(0) == 369 vmClasses::Cloneable_klass(), "u3"); 370 assert(_the_array_interfaces_array->at(1) == 371 vmClasses::Serializable_klass(), "u3"); 372 } else 373 #endif 374 { 375 // Set up shared interfaces array. (Do this before supers are set up.) 376 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass()); 377 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass()); 378 } 379 380 initialize_basic_type_klass(_fillerArrayKlassObj, CHECK); 381 382 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 383 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 384 initialize_basic_type_klass(floatArrayKlassObj(), CHECK); 385 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 386 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 387 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 388 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 389 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 390 391 assert(_fillerArrayKlassObj != intArrayKlassObj(), 392 "Internal filler array klass should be different to int array Klass"); 393 } // end of core bootstrapping 394 395 { 396 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 397 _the_null_sentinel = OopHandle(vm_global(), tns()); 398 } 399 400 // Create a handle for reference_pending_list 401 _reference_pending_list = OopHandle(vm_global(), nullptr); 402 403 // Maybe this could be lifted up now that object array can be initialized 404 // during the bootstrapping. 405 406 // OLD 407 // Initialize _objectArrayKlass after core bootstraping to make 408 // sure the super class is set up properly for _objectArrayKlass. 409 // --- 410 // NEW 411 // Since some of the old system object arrays have been converted to 412 // ordinary object arrays, _objectArrayKlass will be loaded when 413 // SystemDictionary::initialize(CHECK); is run. See the extra check 414 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 415 _objectArrayKlassObj = InstanceKlass:: 416 cast(vmClasses::Object_klass())->array_klass(1, CHECK); 417 // OLD 418 // Add the class to the class hierarchy manually to make sure that 419 // its vtable is initialized after core bootstrapping is completed. 420 // --- 421 // New 422 // Have already been initialized. 423 _objectArrayKlassObj->append_to_sibling_list(); 424 425 #ifdef ASSERT 426 if (FullGCALot) { 427 // Allocate an array of dummy objects. 428 // We'd like these to be at the bottom of the old generation, 429 // so that when we free one and then collect, 430 // (almost) the whole heap moves 431 // and we find out if we actually update all the oops correctly. 432 // But we can't allocate directly in the old generation, 433 // so we allocate wherever, and hope that the first collection 434 // moves these objects to the bottom of the old generation. 435 int size = FullGCALotDummies * 2; 436 437 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK); 438 objArrayHandle dummy_array(THREAD, naked_array); 439 int i = 0; 440 while (i < size) { 441 // Allocate dummy in old generation 442 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK); 443 dummy_array->obj_at_put(i++, dummy); 444 } 445 { 446 // Only modify the global variable inside the mutex. 447 // If we had a race to here, the other dummy_array instances 448 // and their elements just get dropped on the floor, which is fine. 449 MutexLocker ml(THREAD, FullGCALot_lock); 450 if (_fullgc_alot_dummy_array.is_empty()) { 451 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array()); 452 } 453 } 454 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking"); 455 } 456 #endif 457 } 458 459 void Universe::initialize_basic_type_mirrors(TRAPS) { 460 #if INCLUDE_CDS_JAVA_HEAP 461 if (UseSharedSpaces && 462 ArchiveHeapLoader::is_in_use() && 463 _basic_type_mirrors[T_INT].resolve() != nullptr) { 464 assert(ArchiveHeapLoader::can_use(), "Sanity"); 465 466 // check that all basic type mirrors are mapped also 467 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 468 if (!is_reference_type((BasicType)i)) { 469 oop m = _basic_type_mirrors[i].resolve(); 470 assert(m != nullptr, "archived mirrors should not be null"); 471 } 472 } 473 } else 474 // _basic_type_mirrors[T_INT], etc, are null if archived heap is not mapped. 475 #endif 476 { 477 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 478 BasicType bt = (BasicType)i; 479 if (!is_reference_type(bt)) { 480 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK); 481 _basic_type_mirrors[i] = OopHandle(vm_global(), m); 482 } 483 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1); 484 } 485 } 486 if (DumpSharedSpaces) { 487 HeapShared::init_scratch_objects(CHECK); 488 } 489 } 490 491 void Universe::fixup_mirrors(TRAPS) { 492 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 493 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 494 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 495 // that the number of objects allocated at this point is very small. 496 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded"); 497 HandleMark hm(THREAD); 498 499 if (!UseSharedSpaces) { 500 // Cache the start of the static fields 501 InstanceMirrorKlass::init_offset_of_static_fields(); 502 } 503 504 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 505 int list_length = list->length(); 506 for (int i = 0; i < list_length; i++) { 507 Klass* k = list->at(i); 508 assert(k->is_klass(), "List should only hold classes"); 509 java_lang_Class::fixup_mirror(k, CATCH); 510 } 511 delete java_lang_Class::fixup_mirror_list(); 512 java_lang_Class::set_fixup_mirror_list(nullptr); 513 } 514 515 #define assert_pll_locked(test) \ 516 assert(Heap_lock->test(), "Reference pending list access requires lock") 517 518 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 519 520 oop Universe::reference_pending_list() { 521 if (Thread::current()->is_VM_thread()) { 522 assert_pll_locked(is_locked); 523 } else { 524 assert_pll_ownership(); 525 } 526 return _reference_pending_list.resolve(); 527 } 528 529 void Universe::clear_reference_pending_list() { 530 assert_pll_ownership(); 531 _reference_pending_list.replace(nullptr); 532 } 533 534 bool Universe::has_reference_pending_list() { 535 assert_pll_ownership(); 536 return _reference_pending_list.peek() != nullptr; 537 } 538 539 oop Universe::swap_reference_pending_list(oop list) { 540 assert_pll_locked(is_locked); 541 return _reference_pending_list.xchg(list); 542 } 543 544 #undef assert_pll_locked 545 #undef assert_pll_ownership 546 547 static void reinitialize_vtables() { 548 // The vtables are initialized by starting at java.lang.Object and 549 // initializing through the subclass links, so that the super 550 // classes are always initialized first. 551 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) { 552 Klass* sub = iter.klass(); 553 sub->vtable().initialize_vtable(); 554 } 555 } 556 557 static void reinitialize_itables() { 558 559 class ReinitTableClosure : public KlassClosure { 560 public: 561 void do_klass(Klass* k) { 562 if (k->is_instance_klass()) { 563 InstanceKlass::cast(k)->itable().initialize_itable(); 564 } 565 } 566 }; 567 568 MutexLocker mcld(ClassLoaderDataGraph_lock); 569 ReinitTableClosure cl; 570 ClassLoaderDataGraph::classes_do(&cl); 571 } 572 573 bool Universe::on_page_boundary(void* addr) { 574 return is_aligned(addr, os::vm_page_size()); 575 } 576 577 // the array of preallocated errors with backtraces 578 objArrayOop Universe::preallocated_out_of_memory_errors() { 579 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve(); 580 } 581 582 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); } 583 584 oop Universe::out_of_memory_error_java_heap() { 585 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap)); 586 } 587 588 oop Universe::out_of_memory_error_c_heap() { 589 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap)); 590 } 591 592 oop Universe::out_of_memory_error_metaspace() { 593 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace)); 594 } 595 596 oop Universe::out_of_memory_error_class_metaspace() { 597 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace)); 598 } 599 600 oop Universe::out_of_memory_error_array_size() { 601 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size)); 602 } 603 604 oop Universe::out_of_memory_error_gc_overhead_limit() { 605 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit)); 606 } 607 608 oop Universe::out_of_memory_error_realloc_objects() { 609 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects)); 610 } 611 612 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM 613 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); } 614 615 oop Universe::class_init_out_of_memory_error() { return out_of_memory_errors()->obj_at(_oom_java_heap); } 616 oop Universe::class_init_stack_overflow_error() { return _class_init_stack_overflow_error.resolve(); } 617 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); } 618 619 620 bool Universe::should_fill_in_stack_trace(Handle throwable) { 621 // never attempt to fill in the stack trace of preallocated errors that do not have 622 // backtrace. These errors are kept alive forever and may be "re-used" when all 623 // preallocated errors with backtrace have been consumed. Also need to avoid 624 // a potential loop which could happen if an out of memory occurs when attempting 625 // to allocate the backtrace. 626 objArrayOop preallocated_oom = out_of_memory_errors(); 627 for (int i = 0; i < _oom_count; i++) { 628 if (throwable() == preallocated_oom->obj_at(i)) { 629 return false; 630 } 631 } 632 return true; 633 } 634 635 636 oop Universe::gen_out_of_memory_error(oop default_err) { 637 // generate an out of memory error: 638 // - if there is a preallocated error and stack traces are available 639 // (j.l.Throwable is initialized), then return the preallocated 640 // error with a filled in stack trace, and with the message 641 // provided by the default error. 642 // - otherwise, return the default error, without a stack trace. 643 int next; 644 if ((_preallocated_out_of_memory_error_avail_count > 0) && 645 vmClasses::Throwable_klass()->is_initialized()) { 646 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1); 647 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 648 } else { 649 next = -1; 650 } 651 if (next < 0) { 652 // all preallocated errors have been used. 653 // return default 654 return default_err; 655 } else { 656 JavaThread* current = JavaThread::current(); 657 Handle default_err_h(current, default_err); 658 // get the error object at the slot and set set it to null so that the 659 // array isn't keeping it alive anymore. 660 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next)); 661 assert(exc() != nullptr, "slot has been used already"); 662 preallocated_out_of_memory_errors()->obj_at_put(next, nullptr); 663 664 // use the message from the default error 665 oop msg = java_lang_Throwable::message(default_err_h()); 666 assert(msg != nullptr, "no message"); 667 java_lang_Throwable::set_message(exc(), msg); 668 669 // populate the stack trace and return it. 670 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 671 return exc(); 672 } 673 } 674 675 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) { 676 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve(); 677 } 678 679 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) { 680 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve(); 681 } 682 683 // Setup preallocated OutOfMemoryError errors 684 void Universe::create_preallocated_out_of_memory_errors(TRAPS) { 685 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass(); 686 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK); 687 objArrayHandle oom_array(THREAD, oa); 688 689 for (int i = 0; i < _oom_count; i++) { 690 oop oom_obj = ik->allocate_instance(CHECK); 691 oom_array->obj_at_put(i, oom_obj); 692 } 693 _out_of_memory_errors = OopHandle(vm_global(), oom_array()); 694 695 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK); 696 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg()); 697 698 msg = java_lang_String::create_from_str("C heap space", CHECK); 699 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg()); 700 701 msg = java_lang_String::create_from_str("Metaspace", CHECK); 702 _msg_metaspace = OopHandle(vm_global(), msg()); 703 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg()); 704 705 msg = java_lang_String::create_from_str("Compressed class space", CHECK); 706 _msg_class_metaspace = OopHandle(vm_global(), msg()); 707 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg()); 708 709 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK); 710 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg()); 711 712 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK); 713 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg()); 714 715 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK); 716 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg()); 717 718 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK); 719 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg()); 720 721 // Setup the array of errors that have preallocated backtrace 722 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 723 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK); 724 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance); 725 objArrayHandle preallocated_oom_array(THREAD, instance); 726 727 for (int i=0; i<len; i++) { 728 oop err = ik->allocate_instance(CHECK); 729 Handle err_h(THREAD, err); 730 java_lang_Throwable::allocate_backtrace(err_h, CHECK); 731 preallocated_oom_array->obj_at_put(i, err_h()); 732 } 733 _preallocated_out_of_memory_error_avail_count = (jint)len; 734 } 735 736 intptr_t Universe::_non_oop_bits = 0; 737 738 void* Universe::non_oop_word() { 739 // Neither the high bits nor the low bits of this value is allowed 740 // to look like (respectively) the high or low bits of a real oop. 741 // 742 // High and low are CPU-specific notions, but low always includes 743 // the low-order bit. Since oops are always aligned at least mod 4, 744 // setting the low-order bit will ensure that the low half of the 745 // word will never look like that of a real oop. 746 // 747 // Using the OS-supplied non-memory-address word (usually 0 or -1) 748 // will take care of the high bits, however many there are. 749 750 if (_non_oop_bits == 0) { 751 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 752 } 753 754 return (void*)_non_oop_bits; 755 } 756 757 bool Universe::contains_non_oop_word(void* p) { 758 return *(void**)p == non_oop_word(); 759 } 760 761 static void initialize_global_behaviours() { 762 DefaultICProtectionBehaviour* protection_behavior = new DefaultICProtectionBehaviour(); 763 // Ignore leak of DefaultICProtectionBehaviour. It is overriden by some GC implementations and the 764 // pointer is leaked once. 765 LSAN_IGNORE_OBJECT(protection_behavior); 766 CompiledICProtectionBehaviour::set_current(protection_behavior); 767 } 768 769 jint universe_init() { 770 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 771 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 772 "LogHeapWordSize is incorrect."); 773 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 774 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 775 "oop size is not not a multiple of HeapWord size"); 776 777 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 778 779 initialize_global_behaviours(); 780 781 GCLogPrecious::initialize(); 782 783 #ifdef _LP64 784 MetaspaceShared::adjust_heap_sizes_for_dumping(); 785 #endif // _LP64 786 787 GCConfig::arguments()->initialize_heap_sizes(); 788 789 jint status = Universe::initialize_heap(); 790 if (status != JNI_OK) { 791 return status; 792 } 793 794 Universe::initialize_tlab(); 795 796 Metaspace::global_initialize(); 797 798 // Initialize performance counters for metaspaces 799 MetaspaceCounters::initialize_performance_counters(); 800 801 // Checks 'AfterMemoryInit' constraints. 802 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) { 803 return JNI_EINVAL; 804 } 805 806 // Create memory for metadata. Must be after initializing heap for 807 // DumpSharedSpaces. 808 ClassLoaderData::init_null_class_loader_data(); 809 810 // We have a heap so create the Method* caches before 811 // Metaspace::initialize_shared_spaces() tries to populate them. 812 Universe::_finalizer_register_cache = new LatestMethodCache(); 813 Universe::_loader_addClass_cache = new LatestMethodCache(); 814 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 815 Universe::_throw_no_such_method_error_cache = new LatestMethodCache(); 816 Universe::_do_stack_walk_cache = new LatestMethodCache(); 817 818 #if INCLUDE_CDS 819 DynamicArchive::check_for_dynamic_dump(); 820 if (UseSharedSpaces) { 821 // Read the data structures supporting the shared spaces (shared 822 // system dictionary, symbol table, etc.) 823 MetaspaceShared::initialize_shared_spaces(); 824 } 825 if (Arguments::is_dumping_archive()) { 826 MetaspaceShared::prepare_for_dumping(); 827 } 828 #endif 829 830 SymbolTable::create_table(); 831 StringTable::create_table(); 832 833 if (strlen(VerifySubSet) > 0) { 834 Universe::initialize_verify_flags(); 835 } 836 837 ResolvedMethodTable::create_table(); 838 839 return JNI_OK; 840 } 841 842 jint Universe::initialize_heap() { 843 assert(_collectedHeap == nullptr, "Heap already created"); 844 _collectedHeap = GCConfig::arguments()->create_heap(); 845 846 log_info(gc)("Using %s", _collectedHeap->name()); 847 return _collectedHeap->initialize(); 848 } 849 850 void Universe::initialize_tlab() { 851 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 852 PLAB::startup_initialization(); 853 if (UseTLAB) { 854 ThreadLocalAllocBuffer::startup_initialization(); 855 } 856 } 857 858 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 859 860 assert(alignment <= Arguments::conservative_max_heap_alignment(), 861 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 862 alignment, Arguments::conservative_max_heap_alignment()); 863 864 size_t total_reserved = align_up(heap_size, alignment); 865 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 866 "heap size is too big for compressed oops"); 867 868 size_t page_size = os::vm_page_size(); 869 if (UseLargePages && is_aligned(alignment, os::large_page_size())) { 870 page_size = os::large_page_size(); 871 } else { 872 // Parallel is the only collector that might opt out of using large pages 873 // for the heap. 874 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages"); 875 } 876 877 // Now create the space. 878 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt); 879 880 if (total_rs.is_reserved()) { 881 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 882 "must be exactly of required size and alignment"); 883 // We are good. 884 885 if (AllocateHeapAt != nullptr) { 886 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 887 } 888 889 if (UseCompressedOops) { 890 CompressedOops::initialize(total_rs); 891 } 892 893 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end()); 894 895 return total_rs; 896 } 897 898 vm_exit_during_initialization( 899 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 900 total_reserved/K)); 901 902 // satisfy compiler 903 ShouldNotReachHere(); 904 return ReservedHeapSpace(0, 0, os::vm_page_size()); 905 } 906 907 OopStorage* Universe::vm_weak() { 908 return Universe::_vm_weak; 909 } 910 911 OopStorage* Universe::vm_global() { 912 return Universe::_vm_global; 913 } 914 915 void Universe::oopstorage_init() { 916 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal); 917 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal); 918 } 919 920 void universe_oopstorage_init() { 921 Universe::oopstorage_init(); 922 } 923 924 void initialize_known_method(LatestMethodCache* method_cache, 925 InstanceKlass* ik, 926 const char* method, 927 Symbol* signature, 928 bool is_static, TRAPS) 929 { 930 TempNewSymbol name = SymbolTable::new_symbol(method); 931 Method* m = nullptr; 932 // The klass must be linked before looking up the method. 933 if (!ik->link_class_or_fail(THREAD) || 934 ((m = ik->find_method(name, signature)) == nullptr) || 935 is_static != m->is_static()) { 936 ResourceMark rm(THREAD); 937 // NoSuchMethodException doesn't actually work because it tries to run the 938 // <init> function before java_lang_Class is linked. Print error and exit. 939 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 940 ik->name()->as_C_string(), method)); 941 } 942 method_cache->init(ik, m); 943 } 944 945 void Universe::initialize_known_methods(TRAPS) { 946 // Set up static method for registering finalizers 947 initialize_known_method(_finalizer_register_cache, 948 vmClasses::Finalizer_klass(), 949 "register", 950 vmSymbols::object_void_signature(), true, CHECK); 951 952 initialize_known_method(_throw_illegal_access_error_cache, 953 vmClasses::internal_Unsafe_klass(), 954 "throwIllegalAccessError", 955 vmSymbols::void_method_signature(), true, CHECK); 956 957 initialize_known_method(_throw_no_such_method_error_cache, 958 vmClasses::internal_Unsafe_klass(), 959 "throwNoSuchMethodError", 960 vmSymbols::void_method_signature(), true, CHECK); 961 962 // Set up method for registering loaded classes in class loader vector 963 initialize_known_method(_loader_addClass_cache, 964 vmClasses::ClassLoader_klass(), 965 "addClass", 966 vmSymbols::class_void_signature(), false, CHECK); 967 968 // Set up method for stack walking 969 initialize_known_method(_do_stack_walk_cache, 970 vmClasses::AbstractStackWalker_klass(), 971 "doStackWalk", 972 vmSymbols::doStackWalk_signature(), false, CHECK); 973 } 974 975 void universe2_init() { 976 EXCEPTION_MARK; 977 Universe::genesis(CATCH); 978 } 979 980 // Set after initialization of the module runtime, call_initModuleRuntime 981 void universe_post_module_init() { 982 Universe::_module_initialized = true; 983 } 984 985 bool universe_post_init() { 986 assert(!is_init_completed(), "Error: initialization not yet completed!"); 987 Universe::_fully_initialized = true; 988 EXCEPTION_MARK; 989 if (!UseSharedSpaces) { 990 reinitialize_vtables(); 991 reinitialize_itables(); 992 } 993 994 HandleMark hm(THREAD); 995 // Setup preallocated empty java.lang.Class array for Method reflection. 996 997 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false); 998 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array); 999 1000 // Setup preallocated OutOfMemoryError errors 1001 Universe::create_preallocated_out_of_memory_errors(CHECK_false); 1002 1003 oop instance; 1004 // Setup preallocated cause message for delayed StackOverflowError 1005 if (StackReservedPages > 0) { 1006 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1007 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance); 1008 } 1009 1010 // Setup preallocated NullPointerException 1011 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1012 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1013 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1014 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance); 1015 1016 // Setup preallocated ArithmeticException 1017 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1018 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1019 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1020 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance); 1021 1022 // Virtual Machine Error for when we get into a situation we can't resolve 1023 k = vmClasses::VirtualMachineError_klass(); 1024 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1025 if (!linked) { 1026 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1027 return false; // initialization failed 1028 } 1029 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1030 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance); 1031 1032 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1033 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg()); 1034 1035 // Setup preallocated StackOverflowError for use with class initialization failure 1036 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackOverflowError(), true, CHECK_false); 1037 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1038 Universe::_class_init_stack_overflow_error = OopHandle(Universe::vm_global(), instance); 1039 1040 Universe::initialize_known_methods(CHECK_false); 1041 1042 // This needs to be done before the first scavenge/gc, since 1043 // it's an input to soft ref clearing policy. 1044 { 1045 MutexLocker x(THREAD, Heap_lock); 1046 Universe::heap()->update_capacity_and_used_at_gc(); 1047 } 1048 1049 // ("weak") refs processing infrastructure initialization 1050 Universe::heap()->post_initialize(); 1051 1052 MemoryService::add_metaspace_memory_pools(); 1053 1054 MemoryService::set_universe_heap(Universe::heap()); 1055 #if INCLUDE_CDS 1056 MetaspaceShared::post_initialize(CHECK_false); 1057 #endif 1058 return true; 1059 } 1060 1061 1062 void Universe::compute_base_vtable_size() { 1063 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1064 } 1065 1066 void Universe::print_on(outputStream* st) { 1067 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1068 st->print_cr("Heap"); 1069 heap()->print_on(st); 1070 } 1071 1072 void Universe::print_heap_at_SIGBREAK() { 1073 if (PrintHeapAtSIGBREAK) { 1074 print_on(tty); 1075 tty->cr(); 1076 tty->flush(); 1077 } 1078 } 1079 1080 void Universe::initialize_verify_flags() { 1081 verify_flags = 0; 1082 const char delimiter[] = " ,"; 1083 1084 size_t length = strlen(VerifySubSet); 1085 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1086 strncpy(subset_list, VerifySubSet, length + 1); 1087 char* save_ptr; 1088 1089 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1090 while (token != nullptr) { 1091 if (strcmp(token, "threads") == 0) { 1092 verify_flags |= Verify_Threads; 1093 } else if (strcmp(token, "heap") == 0) { 1094 verify_flags |= Verify_Heap; 1095 } else if (strcmp(token, "symbol_table") == 0) { 1096 verify_flags |= Verify_SymbolTable; 1097 } else if (strcmp(token, "string_table") == 0) { 1098 verify_flags |= Verify_StringTable; 1099 } else if (strcmp(token, "codecache") == 0) { 1100 verify_flags |= Verify_CodeCache; 1101 } else if (strcmp(token, "dictionary") == 0) { 1102 verify_flags |= Verify_SystemDictionary; 1103 } else if (strcmp(token, "classloader_data_graph") == 0) { 1104 verify_flags |= Verify_ClassLoaderDataGraph; 1105 } else if (strcmp(token, "metaspace") == 0) { 1106 verify_flags |= Verify_MetaspaceUtils; 1107 } else if (strcmp(token, "jni_handles") == 0) { 1108 verify_flags |= Verify_JNIHandles; 1109 } else if (strcmp(token, "codecache_oops") == 0) { 1110 verify_flags |= Verify_CodeCacheOops; 1111 } else if (strcmp(token, "resolved_method_table") == 0) { 1112 verify_flags |= Verify_ResolvedMethodTable; 1113 } else if (strcmp(token, "stringdedup") == 0) { 1114 verify_flags |= Verify_StringDedup; 1115 } else { 1116 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1117 } 1118 token = strtok_r(nullptr, delimiter, &save_ptr); 1119 } 1120 FREE_C_HEAP_ARRAY(char, subset_list); 1121 } 1122 1123 bool Universe::should_verify_subset(uint subset) { 1124 if (verify_flags & subset) { 1125 return true; 1126 } 1127 return false; 1128 } 1129 1130 void Universe::verify(VerifyOption option, const char* prefix) { 1131 COMPILER2_PRESENT( 1132 assert(!DerivedPointerTable::is_active(), 1133 "DPT should not be active during verification " 1134 "(of thread stacks below)"); 1135 ) 1136 1137 Thread* thread = Thread::current(); 1138 ResourceMark rm(thread); 1139 HandleMark hm(thread); // Handles created during verification can be zapped 1140 _verify_count++; 1141 1142 FormatBuffer<> title("Verifying %s", prefix); 1143 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1144 if (should_verify_subset(Verify_Threads)) { 1145 log_debug(gc, verify)("Threads"); 1146 Threads::verify(); 1147 } 1148 if (should_verify_subset(Verify_Heap)) { 1149 log_debug(gc, verify)("Heap"); 1150 heap()->verify(option); 1151 } 1152 if (should_verify_subset(Verify_SymbolTable)) { 1153 log_debug(gc, verify)("SymbolTable"); 1154 SymbolTable::verify(); 1155 } 1156 if (should_verify_subset(Verify_StringTable)) { 1157 log_debug(gc, verify)("StringTable"); 1158 StringTable::verify(); 1159 } 1160 if (should_verify_subset(Verify_CodeCache)) { 1161 log_debug(gc, verify)("CodeCache"); 1162 CodeCache::verify(); 1163 } 1164 if (should_verify_subset(Verify_SystemDictionary)) { 1165 log_debug(gc, verify)("SystemDictionary"); 1166 SystemDictionary::verify(); 1167 } 1168 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1169 log_debug(gc, verify)("ClassLoaderDataGraph"); 1170 ClassLoaderDataGraph::verify(); 1171 } 1172 if (should_verify_subset(Verify_MetaspaceUtils)) { 1173 log_debug(gc, verify)("MetaspaceUtils"); 1174 DEBUG_ONLY(MetaspaceUtils::verify();) 1175 } 1176 if (should_verify_subset(Verify_JNIHandles)) { 1177 log_debug(gc, verify)("JNIHandles"); 1178 JNIHandles::verify(); 1179 } 1180 if (should_verify_subset(Verify_CodeCacheOops)) { 1181 log_debug(gc, verify)("CodeCache Oops"); 1182 CodeCache::verify_oops(); 1183 } 1184 if (should_verify_subset(Verify_ResolvedMethodTable)) { 1185 log_debug(gc, verify)("ResolvedMethodTable Oops"); 1186 ResolvedMethodTable::verify(); 1187 } 1188 if (should_verify_subset(Verify_StringDedup)) { 1189 log_debug(gc, verify)("String Deduplication"); 1190 StringDedup::verify(); 1191 } 1192 } 1193 1194 1195 #ifndef PRODUCT 1196 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1197 assert(low_boundary < high_boundary, "bad interval"); 1198 1199 // decide which low-order bits we require to be clear: 1200 size_t alignSize = MinObjAlignmentInBytes; 1201 size_t min_object_size = CollectedHeap::min_fill_size(); 1202 1203 // make an inclusive limit: 1204 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1205 uintptr_t min = (uintptr_t)low_boundary; 1206 assert(min < max, "bad interval"); 1207 uintptr_t diff = max ^ min; 1208 1209 // throw away enough low-order bits to make the diff vanish 1210 uintptr_t mask = (uintptr_t)(-1); 1211 while ((mask & diff) != 0) 1212 mask <<= 1; 1213 uintptr_t bits = (min & mask); 1214 assert(bits == (max & mask), "correct mask"); 1215 // check an intermediate value between min and max, just to make sure: 1216 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1217 1218 // require address alignment, too: 1219 mask |= (alignSize - 1); 1220 1221 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1222 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1223 } 1224 _verify_oop_mask = mask; 1225 _verify_oop_bits = bits; 1226 } 1227 1228 void Universe::set_verify_data(uintptr_t mask, uintptr_t bits) { 1229 _verify_oop_mask = mask; 1230 _verify_oop_bits = bits; 1231 } 1232 1233 // Oop verification (see MacroAssembler::verify_oop) 1234 1235 uintptr_t Universe::verify_oop_mask() { 1236 return _verify_oop_mask; 1237 } 1238 1239 uintptr_t Universe::verify_oop_bits() { 1240 return _verify_oop_bits; 1241 } 1242 1243 uintptr_t Universe::verify_mark_mask() { 1244 return markWord::lock_mask_in_place; 1245 } 1246 1247 uintptr_t Universe::verify_mark_bits() { 1248 intptr_t mask = verify_mark_mask(); 1249 intptr_t bits = (intptr_t)markWord::prototype().value(); 1250 assert((bits & ~mask) == 0, "no stray header bits"); 1251 return bits; 1252 } 1253 #endif // PRODUCT 1254 1255 1256 void LatestMethodCache::init(Klass* k, Method* m) { 1257 if (!UseSharedSpaces) { 1258 _klass = k; 1259 } 1260 #ifndef PRODUCT 1261 else { 1262 // sharing initialization should have already set up _klass 1263 assert(_klass != nullptr, "just checking"); 1264 } 1265 #endif 1266 1267 _method_idnum = m->method_idnum(); 1268 assert(_method_idnum >= 0, "sanity check"); 1269 } 1270 1271 1272 Method* LatestMethodCache::get_method() { 1273 if (klass() == nullptr) return nullptr; 1274 InstanceKlass* ik = InstanceKlass::cast(klass()); 1275 Method* m = ik->method_with_idnum(method_idnum()); 1276 assert(m != nullptr, "sanity check"); 1277 return m; 1278 } 1279 1280 void LatestMethodCache::serialize(SerializeClosure* f) { 1281 f->do_ptr(&_klass); 1282 } 1283 1284 #ifdef ASSERT 1285 // Release dummy object(s) at bottom of heap 1286 bool Universe::release_fullgc_alot_dummy() { 1287 MutexLocker ml(FullGCALot_lock); 1288 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve(); 1289 if (fullgc_alot_dummy_array != nullptr) { 1290 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) { 1291 // No more dummies to release, release entire array instead 1292 _fullgc_alot_dummy_array.release(Universe::vm_global()); 1293 _fullgc_alot_dummy_array = OopHandle(); // null out OopStorage pointer. 1294 return false; 1295 } 1296 1297 // Release dummy at bottom of old generation 1298 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, nullptr); 1299 } 1300 return true; 1301 } 1302 1303 bool Universe::is_gc_active() { 1304 return heap()->is_gc_active(); 1305 } 1306 1307 bool Universe::is_in_heap(const void* p) { 1308 return heap()->is_in(p); 1309 } 1310 1311 #endif // ASSERT