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