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/cdsConfig.hpp" 28 #include "cds/dynamicArchive.hpp" 29 #include "cds/heapShared.hpp" 30 #include "cds/metaspaceShared.hpp" 31 #include "classfile/classLoader.hpp" 32 #include "classfile/classLoaderDataGraph.hpp" 33 #include "classfile/javaClasses.hpp" 34 #include "classfile/stringTable.hpp" 35 #include "classfile/symbolTable.hpp" 36 #include "classfile/systemDictionary.hpp" 37 #include "classfile/vmClasses.hpp" 38 #include "classfile/vmSymbols.hpp" 39 #include "code/codeBehaviours.hpp" 40 #include "code/codeCache.hpp" 41 #include "compiler/oopMap.hpp" 42 #include "gc/shared/collectedHeap.inline.hpp" 43 #include "gc/shared/gcArguments.hpp" 44 #include "gc/shared/gcConfig.hpp" 45 #include "gc/shared/gcLogPrecious.hpp" 46 #include "gc/shared/gcTraceTime.inline.hpp" 47 #include "gc/shared/oopStorageSet.hpp" 48 #include "gc/shared/plab.hpp" 49 #include "gc/shared/stringdedup/stringDedup.hpp" 50 #include "gc/shared/tlab_globals.hpp" 51 #include "logging/log.hpp" 52 #include "logging/logStream.hpp" 53 #include "memory/metadataFactory.hpp" 54 #include "memory/metaspaceClosure.hpp" 55 #include "memory/metaspaceCounters.hpp" 56 #include "memory/metaspaceUtils.hpp" 57 #include "memory/oopFactory.hpp" 58 #include "memory/resourceArea.hpp" 59 #include "memory/universe.hpp" 60 #include "oops/compressedOops.hpp" 61 #include "oops/instanceKlass.hpp" 62 #include "oops/instanceMirrorKlass.hpp" 63 #include "oops/klass.inline.hpp" 64 #include "oops/objArrayOop.inline.hpp" 65 #include "oops/oop.inline.hpp" 66 #include "oops/oopHandle.inline.hpp" 67 #include "oops/typeArrayKlass.hpp" 68 #include "prims/resolvedMethodTable.hpp" 69 #include "runtime/arguments.hpp" 70 #include "runtime/atomic.hpp" 71 #include "runtime/cpuTimeCounters.hpp" 72 #include "runtime/flags/jvmFlagLimit.hpp" 73 #include "runtime/handles.inline.hpp" 74 #include "runtime/init.hpp" 75 #include "runtime/java.hpp" 76 #include "runtime/javaThread.hpp" 77 #include "runtime/jniHandles.hpp" 78 #include "runtime/threads.hpp" 79 #include "runtime/timerTrace.hpp" 80 #include "sanitizers/leak.hpp" 81 #include "services/memoryService.hpp" 82 #include "utilities/align.hpp" 83 #include "utilities/autoRestore.hpp" 84 #include "utilities/debug.hpp" 85 #include "utilities/formatBuffer.hpp" 86 #include "utilities/macros.hpp" 87 #include "utilities/ostream.hpp" 88 #include "utilities/preserveException.hpp" 89 90 // Known objects 91 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { nullptr /*, nullptr...*/ }; 92 Klass* Universe::_objectArrayKlassObj = nullptr; 93 Klass* Universe::_fillerArrayKlassObj = nullptr; 94 OopHandle Universe::_basic_type_mirrors[T_VOID+1]; 95 #if INCLUDE_CDS_JAVA_HEAP 96 int Universe::_archived_basic_type_mirror_indices[T_VOID+1]; 97 #endif 98 99 OopHandle Universe::_main_thread_group; 100 OopHandle Universe::_system_thread_group; 101 OopHandle Universe::_the_empty_class_array; 102 OopHandle Universe::_the_null_string; 103 OopHandle Universe::_the_min_jint_string; 104 105 OopHandle Universe::_the_null_sentinel; 106 107 // _out_of_memory_errors is an objArray 108 enum OutOfMemoryInstance { _oom_java_heap, 109 _oom_c_heap, 110 _oom_metaspace, 111 _oom_class_metaspace, 112 _oom_array_size, 113 _oom_gc_overhead_limit, 114 _oom_realloc_objects, 115 _oom_retry, 116 _oom_count }; 117 118 OopHandle Universe::_out_of_memory_errors; 119 OopHandle Universe:: _class_init_stack_overflow_error; 120 OopHandle Universe::_delayed_stack_overflow_error_message; 121 OopHandle Universe::_preallocated_out_of_memory_error_array; 122 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 123 124 // Message details for OOME objects, preallocate these objects since they could be 125 // used when throwing OOME, we should try to avoid further allocation in such case 126 OopHandle Universe::_msg_metaspace; 127 OopHandle Universe::_msg_class_metaspace; 128 129 OopHandle Universe::_null_ptr_exception_instance; 130 OopHandle Universe::_arithmetic_exception_instance; 131 OopHandle Universe::_virtual_machine_error_instance; 132 133 OopHandle Universe::_reference_pending_list; 134 135 Array<Klass*>* Universe::_the_array_interfaces_array = nullptr; 136 LatestMethodCache* Universe::_finalizer_register_cache = nullptr; 137 LatestMethodCache* Universe::_loader_addClass_cache = nullptr; 138 LatestMethodCache* Universe::_throw_illegal_access_error_cache = nullptr; 139 LatestMethodCache* Universe::_throw_no_such_method_error_cache = nullptr; 140 LatestMethodCache* Universe::_do_stack_walk_cache = nullptr; 141 LatestMethodCache* Universe::_is_substitutable_cache = nullptr; 142 LatestMethodCache* Universe::_value_object_hash_code_cache = nullptr; 143 144 long Universe::verify_flags = Universe::Verify_All; 145 146 Array<int>* Universe::_the_empty_int_array = nullptr; 147 Array<u2>* Universe::_the_empty_short_array = nullptr; 148 Array<Klass*>* Universe::_the_empty_klass_array = nullptr; 149 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = nullptr; 150 Array<Method*>* Universe::_the_empty_method_array = nullptr; 151 152 // These variables are guarded by FullGCALot_lock. 153 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;) 154 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 155 156 // Heap 157 int Universe::_verify_count = 0; 158 159 // Oop verification (see MacroAssembler::verify_oop) 160 uintptr_t Universe::_verify_oop_mask = 0; 161 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 162 163 int Universe::_base_vtable_size = 0; 164 bool Universe::_bootstrapping = false; 165 bool Universe::_module_initialized = false; 166 bool Universe::_fully_initialized = false; 167 168 OopStorage* Universe::_vm_weak = nullptr; 169 OopStorage* Universe::_vm_global = nullptr; 170 171 CollectedHeap* Universe::_collectedHeap = nullptr; 172 173 objArrayOop Universe::the_empty_class_array () { 174 return (objArrayOop)_the_empty_class_array.resolve(); 175 } 176 177 oop Universe::main_thread_group() { return _main_thread_group.resolve(); } 178 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); } 179 180 oop Universe::system_thread_group() { return _system_thread_group.resolve(); } 181 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); } 182 183 oop Universe::the_null_string() { return _the_null_string.resolve(); } 184 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); } 185 186 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); } 187 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); } 188 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); } 189 190 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); } 191 192 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); } 193 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); } 194 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); } 195 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); } 196 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); } 197 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); } 198 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); } 199 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); } 200 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); } 201 202 oop Universe::java_mirror(BasicType t) { 203 assert((uint)t < T_VOID+1, "range check"); 204 assert(!is_reference_type(t), "sanity"); 205 return check_mirror(_basic_type_mirrors[t].resolve()); 206 } 207 208 void Universe::basic_type_classes_do(KlassClosure *closure) { 209 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 210 closure->do_klass(_typeArrayKlassObjs[i]); 211 } 212 // We don't do the following because it will confuse JVMTI. 213 // _fillerArrayKlassObj is used only by GC, which doesn't need to see 214 // this klass from basic_type_classes_do(). 215 // 216 // closure->do_klass(_fillerArrayKlassObj); 217 } 218 219 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 220 it->push(&_klass); 221 } 222 223 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 224 it->push(&_fillerArrayKlassObj); 225 for (int i = 0; i < T_LONG+1; i++) { 226 it->push(&_typeArrayKlassObjs[i]); 227 } 228 it->push(&_objectArrayKlassObj); 229 230 it->push(&_the_empty_int_array); 231 it->push(&_the_empty_short_array); 232 it->push(&_the_empty_klass_array); 233 it->push(&_the_empty_instance_klass_array); 234 it->push(&_the_empty_method_array); 235 it->push(&_the_array_interfaces_array); 236 237 _finalizer_register_cache->metaspace_pointers_do(it); 238 _loader_addClass_cache->metaspace_pointers_do(it); 239 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 240 _throw_no_such_method_error_cache->metaspace_pointers_do(it); 241 _do_stack_walk_cache->metaspace_pointers_do(it); 242 _is_substitutable_cache->metaspace_pointers_do(it); 243 _value_object_hash_code_cache->metaspace_pointers_do(it); 244 } 245 246 #if INCLUDE_CDS_JAVA_HEAP 247 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) { 248 assert(CDSConfig::is_dumping_heap(), "sanity"); 249 assert(!is_reference_type(t), "sanity"); 250 _archived_basic_type_mirror_indices[t] = index; 251 } 252 253 void Universe::update_archived_basic_type_mirrors() { 254 if (ArchiveHeapLoader::is_in_use()) { 255 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 256 int index = _archived_basic_type_mirror_indices[i]; 257 if (!is_reference_type((BasicType)i) && index >= 0) { 258 oop mirror_oop = HeapShared::get_root(index); 259 assert(mirror_oop != nullptr, "must be"); 260 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop); 261 } 262 } 263 } 264 } 265 #endif 266 267 void Universe::serialize(SerializeClosure* f) { 268 269 #if INCLUDE_CDS_JAVA_HEAP 270 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 271 f->do_int(&_archived_basic_type_mirror_indices[i]); 272 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap 273 // contents may need to be relocated. _basic_type_mirrors[i] will be 274 // updated later in Universe::update_archived_basic_type_mirrors(). 275 } 276 #endif 277 278 f->do_ptr(&_fillerArrayKlassObj); 279 for (int i = 0; i < T_LONG+1; i++) { 280 f->do_ptr(&_typeArrayKlassObjs[i]); 281 } 282 283 f->do_ptr(&_objectArrayKlassObj); 284 f->do_ptr(&_the_array_interfaces_array); 285 f->do_ptr(&_the_empty_int_array); 286 f->do_ptr(&_the_empty_short_array); 287 f->do_ptr(&_the_empty_method_array); 288 f->do_ptr(&_the_empty_klass_array); 289 f->do_ptr(&_the_empty_instance_klass_array); 290 _finalizer_register_cache->serialize(f); 291 _loader_addClass_cache->serialize(f); 292 _throw_illegal_access_error_cache->serialize(f); 293 _throw_no_such_method_error_cache->serialize(f); 294 _do_stack_walk_cache->serialize(f); 295 _is_substitutable_cache->serialize(f); 296 _value_object_hash_code_cache->serialize(f); 297 } 298 299 300 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 301 if (size < alignment || size % alignment != 0) { 302 vm_exit_during_initialization( 303 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 304 } 305 } 306 307 void initialize_basic_type_klass(Klass* k, TRAPS) { 308 Klass* ok = vmClasses::Object_klass(); 309 #if INCLUDE_CDS 310 if (UseSharedSpaces) { 311 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 312 assert(k->super() == ok, "u3"); 313 if (k->is_instance_klass()) { 314 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), nullptr, CHECK); 315 } else { 316 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK); 317 } 318 } else 319 #endif 320 { 321 k->initialize_supers(ok, nullptr, CHECK); 322 } 323 k->append_to_sibling_list(); 324 } 325 326 void Universe::genesis(TRAPS) { 327 ResourceMark rm(THREAD); 328 HandleMark hm(THREAD); 329 330 // Explicit null checks are needed if these offsets are not smaller than the page size 331 assert(oopDesc::klass_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()), 332 "Klass offset is expected to be less than the page size"); 333 assert(arrayOopDesc::length_offset_in_bytes() < static_cast<intptr_t>(os::vm_page_size()), 334 "Array length offset is expected to be less than the page size"); 335 336 { AutoModifyRestore<bool> temporarily(_bootstrapping, true); 337 338 java_lang_Class::allocate_fixup_lists(); 339 340 // determine base vtable size; without that we cannot create the array klasses 341 compute_base_vtable_size(); 342 343 if (!UseSharedSpaces) { 344 // Initialization of the fillerArrayKlass must come before regular 345 // int-TypeArrayKlass so that the int-Array mirror points to the 346 // int-TypeArrayKlass. 347 _fillerArrayKlassObj = TypeArrayKlass::create_klass(T_INT, "Ljdk/internal/vm/FillerArray;", CHECK); 348 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 349 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 350 } 351 352 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 353 354 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, nullptr, CHECK); 355 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 356 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 357 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 358 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 359 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 360 } 361 362 vmSymbols::initialize(); 363 364 SystemDictionary::initialize(CHECK); 365 366 // Create string constants 367 oop s = StringTable::intern("null", CHECK); 368 _the_null_string = OopHandle(vm_global(), s); 369 s = StringTable::intern("-2147483648", CHECK); 370 _the_min_jint_string = OopHandle(vm_global(), s); 371 372 373 #if INCLUDE_CDS 374 if (UseSharedSpaces) { 375 // Verify shared interfaces array. 376 assert(_the_array_interfaces_array->at(0) == 377 vmClasses::Cloneable_klass(), "u3"); 378 assert(_the_array_interfaces_array->at(1) == 379 vmClasses::Serializable_klass(), "u3"); 380 381 } else 382 #endif 383 { 384 // Set up shared interfaces array. (Do this before supers are set up.) 385 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass()); 386 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass()); 387 } 388 389 initialize_basic_type_klass(_fillerArrayKlassObj, CHECK); 390 391 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 392 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 393 initialize_basic_type_klass(floatArrayKlassObj(), CHECK); 394 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 395 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 396 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 397 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 398 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 399 400 assert(_fillerArrayKlassObj != intArrayKlassObj(), 401 "Internal filler array klass should be different to int array Klass"); 402 } // end of core bootstrapping 403 404 { 405 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 406 _the_null_sentinel = OopHandle(vm_global(), tns()); 407 } 408 409 // Create a handle for reference_pending_list 410 _reference_pending_list = OopHandle(vm_global(), nullptr); 411 412 // Maybe this could be lifted up now that object array can be initialized 413 // during the bootstrapping. 414 415 // OLD 416 // Initialize _objectArrayKlass after core bootstraping to make 417 // sure the super class is set up properly for _objectArrayKlass. 418 // --- 419 // NEW 420 // Since some of the old system object arrays have been converted to 421 // ordinary object arrays, _objectArrayKlass will be loaded when 422 // SystemDictionary::initialize(CHECK); is run. See the extra check 423 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 424 _objectArrayKlassObj = InstanceKlass:: 425 cast(vmClasses::Object_klass())->array_klass(1, CHECK); 426 // OLD 427 // Add the class to the class hierarchy manually to make sure that 428 // its vtable is initialized after core bootstrapping is completed. 429 // --- 430 // New 431 // Have already been initialized. 432 _objectArrayKlassObj->append_to_sibling_list(); 433 434 #ifdef ASSERT 435 if (FullGCALot) { 436 // Allocate an array of dummy objects. 437 // We'd like these to be at the bottom of the old generation, 438 // so that when we free one and then collect, 439 // (almost) the whole heap moves 440 // and we find out if we actually update all the oops correctly. 441 // But we can't allocate directly in the old generation, 442 // so we allocate wherever, and hope that the first collection 443 // moves these objects to the bottom of the old generation. 444 int size = FullGCALotDummies * 2; 445 446 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK); 447 objArrayHandle dummy_array(THREAD, naked_array); 448 int i = 0; 449 while (i < size) { 450 // Allocate dummy in old generation 451 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK); 452 dummy_array->obj_at_put(i++, dummy); 453 } 454 { 455 // Only modify the global variable inside the mutex. 456 // If we had a race to here, the other dummy_array instances 457 // and their elements just get dropped on the floor, which is fine. 458 MutexLocker ml(THREAD, FullGCALot_lock); 459 if (_fullgc_alot_dummy_array.is_empty()) { 460 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array()); 461 } 462 } 463 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking"); 464 } 465 #endif 466 } 467 468 void Universe::initialize_basic_type_mirrors(TRAPS) { 469 #if INCLUDE_CDS_JAVA_HEAP 470 if (UseSharedSpaces && 471 ArchiveHeapLoader::is_in_use() && 472 _basic_type_mirrors[T_INT].resolve() != nullptr) { 473 assert(ArchiveHeapLoader::can_use(), "Sanity"); 474 475 // check that all basic type mirrors are mapped also 476 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 477 if (!is_reference_type((BasicType)i)) { 478 oop m = _basic_type_mirrors[i].resolve(); 479 assert(m != nullptr, "archived mirrors should not be null"); 480 } 481 } 482 } else 483 // _basic_type_mirrors[T_INT], etc, are null if archived heap is not mapped. 484 #endif 485 { 486 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 487 BasicType bt = (BasicType)i; 488 if (!is_reference_type(bt)) { 489 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK); 490 _basic_type_mirrors[i] = OopHandle(vm_global(), m); 491 } 492 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1); 493 } 494 } 495 if (CDSConfig::is_dumping_heap()) { 496 HeapShared::init_scratch_objects(CHECK); 497 } 498 } 499 500 void Universe::fixup_mirrors(TRAPS) { 501 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 502 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 503 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 504 // that the number of objects allocated at this point is very small. 505 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded"); 506 HandleMark hm(THREAD); 507 508 if (!UseSharedSpaces) { 509 // Cache the start of the static fields 510 InstanceMirrorKlass::init_offset_of_static_fields(); 511 } 512 513 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 514 int list_length = list->length(); 515 for (int i = 0; i < list_length; i++) { 516 Klass* k = list->at(i); 517 assert(k->is_klass(), "List should only hold classes"); 518 java_lang_Class::fixup_mirror(k, CATCH); 519 } 520 delete java_lang_Class::fixup_mirror_list(); 521 java_lang_Class::set_fixup_mirror_list(nullptr); 522 } 523 524 #define assert_pll_locked(test) \ 525 assert(Heap_lock->test(), "Reference pending list access requires lock") 526 527 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 528 529 oop Universe::reference_pending_list() { 530 if (Thread::current()->is_VM_thread()) { 531 assert_pll_locked(is_locked); 532 } else { 533 assert_pll_ownership(); 534 } 535 return _reference_pending_list.resolve(); 536 } 537 538 void Universe::clear_reference_pending_list() { 539 assert_pll_ownership(); 540 _reference_pending_list.replace(nullptr); 541 } 542 543 bool Universe::has_reference_pending_list() { 544 assert_pll_ownership(); 545 return _reference_pending_list.peek() != nullptr; 546 } 547 548 oop Universe::swap_reference_pending_list(oop list) { 549 assert_pll_locked(is_locked); 550 return _reference_pending_list.xchg(list); 551 } 552 553 #undef assert_pll_locked 554 #undef assert_pll_ownership 555 556 static void reinitialize_vtables() { 557 // The vtables are initialized by starting at java.lang.Object and 558 // initializing through the subclass links, so that the super 559 // classes are always initialized first. 560 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) { 561 Klass* sub = iter.klass(); 562 sub->vtable().initialize_vtable(); 563 } 564 } 565 566 static void reinitialize_itables() { 567 568 class ReinitTableClosure : public KlassClosure { 569 public: 570 void do_klass(Klass* k) { 571 if (k->is_instance_klass()) { 572 InstanceKlass::cast(k)->itable().initialize_itable(); 573 } 574 } 575 }; 576 577 MutexLocker mcld(ClassLoaderDataGraph_lock); 578 ReinitTableClosure cl; 579 ClassLoaderDataGraph::classes_do(&cl); 580 } 581 582 bool Universe::on_page_boundary(void* addr) { 583 return is_aligned(addr, os::vm_page_size()); 584 } 585 586 // the array of preallocated errors with backtraces 587 objArrayOop Universe::preallocated_out_of_memory_errors() { 588 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve(); 589 } 590 591 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); } 592 593 oop Universe::out_of_memory_error_java_heap() { 594 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap)); 595 } 596 597 oop Universe::out_of_memory_error_c_heap() { 598 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap)); 599 } 600 601 oop Universe::out_of_memory_error_metaspace() { 602 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace)); 603 } 604 605 oop Universe::out_of_memory_error_class_metaspace() { 606 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace)); 607 } 608 609 oop Universe::out_of_memory_error_array_size() { 610 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size)); 611 } 612 613 oop Universe::out_of_memory_error_gc_overhead_limit() { 614 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit)); 615 } 616 617 oop Universe::out_of_memory_error_realloc_objects() { 618 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects)); 619 } 620 621 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM 622 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); } 623 624 oop Universe::class_init_out_of_memory_error() { return out_of_memory_errors()->obj_at(_oom_java_heap); } 625 oop Universe::class_init_stack_overflow_error() { return _class_init_stack_overflow_error.resolve(); } 626 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); } 627 628 629 bool Universe::should_fill_in_stack_trace(Handle throwable) { 630 // never attempt to fill in the stack trace of preallocated errors that do not have 631 // backtrace. These errors are kept alive forever and may be "re-used" when all 632 // preallocated errors with backtrace have been consumed. Also need to avoid 633 // a potential loop which could happen if an out of memory occurs when attempting 634 // to allocate the backtrace. 635 objArrayOop preallocated_oom = out_of_memory_errors(); 636 for (int i = 0; i < _oom_count; i++) { 637 if (throwable() == preallocated_oom->obj_at(i)) { 638 return false; 639 } 640 } 641 return true; 642 } 643 644 645 oop Universe::gen_out_of_memory_error(oop default_err) { 646 // generate an out of memory error: 647 // - if there is a preallocated error and stack traces are available 648 // (j.l.Throwable is initialized), then return the preallocated 649 // error with a filled in stack trace, and with the message 650 // provided by the default error. 651 // - otherwise, return the default error, without a stack trace. 652 int next; 653 if ((_preallocated_out_of_memory_error_avail_count > 0) && 654 vmClasses::Throwable_klass()->is_initialized()) { 655 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1); 656 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 657 } else { 658 next = -1; 659 } 660 if (next < 0) { 661 // all preallocated errors have been used. 662 // return default 663 return default_err; 664 } else { 665 JavaThread* current = JavaThread::current(); 666 Handle default_err_h(current, default_err); 667 // get the error object at the slot and set set it to null so that the 668 // array isn't keeping it alive anymore. 669 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next)); 670 assert(exc() != nullptr, "slot has been used already"); 671 preallocated_out_of_memory_errors()->obj_at_put(next, nullptr); 672 673 // use the message from the default error 674 oop msg = java_lang_Throwable::message(default_err_h()); 675 assert(msg != nullptr, "no message"); 676 java_lang_Throwable::set_message(exc(), msg); 677 678 // populate the stack trace and return it. 679 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 680 return exc(); 681 } 682 } 683 684 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) { 685 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve(); 686 } 687 688 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) { 689 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve(); 690 } 691 692 // Setup preallocated OutOfMemoryError errors 693 void Universe::create_preallocated_out_of_memory_errors(TRAPS) { 694 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass(); 695 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK); 696 objArrayHandle oom_array(THREAD, oa); 697 698 for (int i = 0; i < _oom_count; i++) { 699 oop oom_obj = ik->allocate_instance(CHECK); 700 oom_array->obj_at_put(i, oom_obj); 701 } 702 _out_of_memory_errors = OopHandle(vm_global(), oom_array()); 703 704 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK); 705 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg()); 706 707 msg = java_lang_String::create_from_str("C heap space", CHECK); 708 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg()); 709 710 msg = java_lang_String::create_from_str("Metaspace", CHECK); 711 _msg_metaspace = OopHandle(vm_global(), msg()); 712 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg()); 713 714 msg = java_lang_String::create_from_str("Compressed class space", CHECK); 715 _msg_class_metaspace = OopHandle(vm_global(), msg()); 716 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg()); 717 718 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK); 719 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg()); 720 721 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK); 722 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg()); 723 724 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK); 725 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg()); 726 727 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK); 728 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg()); 729 730 // Setup the array of errors that have preallocated backtrace 731 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 732 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK); 733 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance); 734 objArrayHandle preallocated_oom_array(THREAD, instance); 735 736 for (int i=0; i<len; i++) { 737 oop err = ik->allocate_instance(CHECK); 738 Handle err_h(THREAD, err); 739 java_lang_Throwable::allocate_backtrace(err_h, CHECK); 740 preallocated_oom_array->obj_at_put(i, err_h()); 741 } 742 _preallocated_out_of_memory_error_avail_count = (jint)len; 743 } 744 745 intptr_t Universe::_non_oop_bits = 0; 746 747 void* Universe::non_oop_word() { 748 // Neither the high bits nor the low bits of this value is allowed 749 // to look like (respectively) the high or low bits of a real oop. 750 // 751 // High and low are CPU-specific notions, but low always includes 752 // the low-order bit. Since oops are always aligned at least mod 4, 753 // setting the low-order bit will ensure that the low half of the 754 // word will never look like that of a real oop. 755 // 756 // Using the OS-supplied non-memory-address word (usually 0 or -1) 757 // will take care of the high bits, however many there are. 758 759 if (_non_oop_bits == 0) { 760 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 761 } 762 763 return (void*)_non_oop_bits; 764 } 765 766 bool Universe::contains_non_oop_word(void* p) { 767 return *(void**)p == non_oop_word(); 768 } 769 770 static void initialize_global_behaviours() { 771 DefaultICProtectionBehaviour* protection_behavior = new DefaultICProtectionBehaviour(); 772 // Ignore leak of DefaultICProtectionBehaviour. It is overriden by some GC implementations and the 773 // pointer is leaked once. 774 LSAN_IGNORE_OBJECT(protection_behavior); 775 CompiledICProtectionBehaviour::set_current(protection_behavior); 776 } 777 778 jint universe_init() { 779 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 780 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 781 "LogHeapWordSize is incorrect."); 782 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 783 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 784 "oop size is not not a multiple of HeapWord size"); 785 786 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 787 788 initialize_global_behaviours(); 789 790 GCLogPrecious::initialize(); 791 792 // Initialize CPUTimeCounters object, which must be done before creation of the heap. 793 CPUTimeCounters::initialize(); 794 795 #ifdef _LP64 796 MetaspaceShared::adjust_heap_sizes_for_dumping(); 797 #endif // _LP64 798 799 GCConfig::arguments()->initialize_heap_sizes(); 800 801 jint status = Universe::initialize_heap(); 802 if (status != JNI_OK) { 803 return status; 804 } 805 806 Universe::initialize_tlab(); 807 808 Metaspace::global_initialize(); 809 // Initialize performance counters for metaspaces 810 MetaspaceCounters::initialize_performance_counters(); 811 812 // Checks 'AfterMemoryInit' constraints. 813 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) { 814 return JNI_EINVAL; 815 } 816 817 ClassLoaderData::init_null_class_loader_data(); 818 819 // We have a heap so create the Method* caches before 820 // Metaspace::initialize_shared_spaces() tries to populate them. 821 Universe::_finalizer_register_cache = new LatestMethodCache(); 822 Universe::_loader_addClass_cache = new LatestMethodCache(); 823 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 824 Universe::_throw_no_such_method_error_cache = new LatestMethodCache(); 825 Universe::_do_stack_walk_cache = new LatestMethodCache(); 826 Universe::_is_substitutable_cache = new LatestMethodCache(); 827 Universe::_value_object_hash_code_cache = new LatestMethodCache(); 828 829 #if INCLUDE_CDS 830 DynamicArchive::check_for_dynamic_dump(); 831 if (UseSharedSpaces) { 832 // Read the data structures supporting the shared spaces (shared 833 // system dictionary, symbol table, etc.) 834 MetaspaceShared::initialize_shared_spaces(); 835 } 836 if (CDSConfig::is_dumping_archive()) { 837 MetaspaceShared::prepare_for_dumping(); 838 } 839 #endif 840 841 SymbolTable::create_table(); 842 StringTable::create_table(); 843 844 if (strlen(VerifySubSet) > 0) { 845 Universe::initialize_verify_flags(); 846 } 847 848 ResolvedMethodTable::create_table(); 849 850 return JNI_OK; 851 } 852 853 jint Universe::initialize_heap() { 854 assert(_collectedHeap == nullptr, "Heap already created"); 855 _collectedHeap = GCConfig::arguments()->create_heap(); 856 857 log_info(gc)("Using %s", _collectedHeap->name()); 858 return _collectedHeap->initialize(); 859 } 860 861 void Universe::initialize_tlab() { 862 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 863 PLAB::startup_initialization(); 864 if (UseTLAB) { 865 ThreadLocalAllocBuffer::startup_initialization(); 866 } 867 } 868 869 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 870 871 assert(alignment <= Arguments::conservative_max_heap_alignment(), 872 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 873 alignment, Arguments::conservative_max_heap_alignment()); 874 875 size_t total_reserved = align_up(heap_size, alignment); 876 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 877 "heap size is too big for compressed oops"); 878 879 size_t page_size = os::vm_page_size(); 880 if (UseLargePages && is_aligned(alignment, os::large_page_size())) { 881 page_size = os::large_page_size(); 882 } else { 883 // Parallel is the only collector that might opt out of using large pages 884 // for the heap. 885 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages"); 886 } 887 888 // Now create the space. 889 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt); 890 891 if (total_rs.is_reserved()) { 892 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 893 "must be exactly of required size and alignment"); 894 // We are good. 895 896 if (AllocateHeapAt != nullptr) { 897 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 898 } 899 900 if (UseCompressedOops) { 901 CompressedOops::initialize(total_rs); 902 } 903 904 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end()); 905 906 return total_rs; 907 } 908 909 vm_exit_during_initialization( 910 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 911 total_reserved/K)); 912 913 // satisfy compiler 914 ShouldNotReachHere(); 915 return ReservedHeapSpace(0, 0, os::vm_page_size()); 916 } 917 918 OopStorage* Universe::vm_weak() { 919 return Universe::_vm_weak; 920 } 921 922 OopStorage* Universe::vm_global() { 923 return Universe::_vm_global; 924 } 925 926 void Universe::oopstorage_init() { 927 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal); 928 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal); 929 } 930 931 void universe_oopstorage_init() { 932 Universe::oopstorage_init(); 933 } 934 935 void initialize_known_method(LatestMethodCache* method_cache, 936 InstanceKlass* ik, 937 const char* method, 938 Symbol* signature, 939 bool is_static, TRAPS) 940 { 941 TempNewSymbol name = SymbolTable::new_symbol(method); 942 Method* m = nullptr; 943 // The klass must be linked before looking up the method. 944 if (!ik->link_class_or_fail(THREAD) || 945 ((m = ik->find_method(name, signature)) == nullptr) || 946 is_static != m->is_static()) { 947 ResourceMark rm(THREAD); 948 // NoSuchMethodException doesn't actually work because it tries to run the 949 // <init> function before java_lang_Class is linked. Print error and exit. 950 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 951 ik->name()->as_C_string(), method)); 952 } 953 method_cache->init(ik, m); 954 } 955 956 void Universe::initialize_known_methods(TRAPS) { 957 // Set up static method for registering finalizers 958 initialize_known_method(_finalizer_register_cache, 959 vmClasses::Finalizer_klass(), 960 "register", 961 vmSymbols::object_void_signature(), true, CHECK); 962 963 initialize_known_method(_throw_illegal_access_error_cache, 964 vmClasses::internal_Unsafe_klass(), 965 "throwIllegalAccessError", 966 vmSymbols::void_method_signature(), true, CHECK); 967 968 initialize_known_method(_throw_no_such_method_error_cache, 969 vmClasses::internal_Unsafe_klass(), 970 "throwNoSuchMethodError", 971 vmSymbols::void_method_signature(), true, CHECK); 972 973 // Set up method for registering loaded classes in class loader vector 974 initialize_known_method(_loader_addClass_cache, 975 vmClasses::ClassLoader_klass(), 976 "addClass", 977 vmSymbols::class_void_signature(), false, CHECK); 978 979 // Set up method for stack walking 980 initialize_known_method(_do_stack_walk_cache, 981 vmClasses::AbstractStackWalker_klass(), 982 "doStackWalk", 983 vmSymbols::doStackWalk_signature(), false, CHECK); 984 985 // Set up substitutability testing 986 ResourceMark rm; 987 initialize_known_method(_is_substitutable_cache, 988 vmClasses::ValueObjectMethods_klass(), 989 vmSymbols::isSubstitutable_name()->as_C_string(), 990 vmSymbols::object_object_boolean_signature(), true, CHECK); 991 initialize_known_method(_value_object_hash_code_cache, 992 vmClasses::ValueObjectMethods_klass(), 993 vmSymbols::valueObjectHashCode_name()->as_C_string(), 994 vmSymbols::object_int_signature(), true, CHECK); 995 } 996 997 void universe2_init() { 998 EXCEPTION_MARK; 999 Universe::genesis(CATCH); 1000 } 1001 1002 // Set after initialization of the module runtime, call_initModuleRuntime 1003 void universe_post_module_init() { 1004 Universe::_module_initialized = true; 1005 } 1006 1007 bool universe_post_init() { 1008 assert(!is_init_completed(), "Error: initialization not yet completed!"); 1009 Universe::_fully_initialized = true; 1010 EXCEPTION_MARK; 1011 if (!UseSharedSpaces) { 1012 reinitialize_vtables(); 1013 reinitialize_itables(); 1014 } 1015 1016 HandleMark hm(THREAD); 1017 // Setup preallocated empty java.lang.Class array for Method reflection. 1018 1019 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false); 1020 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array); 1021 1022 // Setup preallocated OutOfMemoryError errors 1023 Universe::create_preallocated_out_of_memory_errors(CHECK_false); 1024 1025 oop instance; 1026 // Setup preallocated cause message for delayed StackOverflowError 1027 if (StackReservedPages > 0) { 1028 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1029 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance); 1030 } 1031 1032 // Setup preallocated NullPointerException 1033 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1034 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1035 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1036 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance); 1037 1038 // Setup preallocated ArithmeticException 1039 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1040 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1041 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1042 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance); 1043 1044 // Virtual Machine Error for when we get into a situation we can't resolve 1045 k = vmClasses::VirtualMachineError_klass(); 1046 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1047 if (!linked) { 1048 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1049 return false; // initialization failed 1050 } 1051 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1052 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance); 1053 1054 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1055 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg()); 1056 1057 // Setup preallocated StackOverflowError for use with class initialization failure 1058 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackOverflowError(), true, CHECK_false); 1059 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1060 Universe::_class_init_stack_overflow_error = OopHandle(Universe::vm_global(), instance); 1061 1062 Universe::initialize_known_methods(CHECK_false); 1063 1064 // This needs to be done before the first scavenge/gc, since 1065 // it's an input to soft ref clearing policy. 1066 { 1067 MutexLocker x(THREAD, Heap_lock); 1068 Universe::heap()->update_capacity_and_used_at_gc(); 1069 } 1070 1071 // ("weak") refs processing infrastructure initialization 1072 Universe::heap()->post_initialize(); 1073 1074 MemoryService::add_metaspace_memory_pools(); 1075 1076 MemoryService::set_universe_heap(Universe::heap()); 1077 #if INCLUDE_CDS 1078 MetaspaceShared::post_initialize(CHECK_false); 1079 #endif 1080 return true; 1081 } 1082 1083 1084 void Universe::compute_base_vtable_size() { 1085 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1086 } 1087 1088 void Universe::print_on(outputStream* st) { 1089 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1090 st->print_cr("Heap"); 1091 heap()->print_on(st); 1092 } 1093 1094 void Universe::print_heap_at_SIGBREAK() { 1095 if (PrintHeapAtSIGBREAK) { 1096 print_on(tty); 1097 tty->cr(); 1098 tty->flush(); 1099 } 1100 } 1101 1102 void Universe::initialize_verify_flags() { 1103 verify_flags = 0; 1104 const char delimiter[] = " ,"; 1105 1106 size_t length = strlen(VerifySubSet); 1107 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1108 strncpy(subset_list, VerifySubSet, length + 1); 1109 char* save_ptr; 1110 1111 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1112 while (token != nullptr) { 1113 if (strcmp(token, "threads") == 0) { 1114 verify_flags |= Verify_Threads; 1115 } else if (strcmp(token, "heap") == 0) { 1116 verify_flags |= Verify_Heap; 1117 } else if (strcmp(token, "symbol_table") == 0) { 1118 verify_flags |= Verify_SymbolTable; 1119 } else if (strcmp(token, "string_table") == 0) { 1120 verify_flags |= Verify_StringTable; 1121 } else if (strcmp(token, "codecache") == 0) { 1122 verify_flags |= Verify_CodeCache; 1123 } else if (strcmp(token, "dictionary") == 0) { 1124 verify_flags |= Verify_SystemDictionary; 1125 } else if (strcmp(token, "classloader_data_graph") == 0) { 1126 verify_flags |= Verify_ClassLoaderDataGraph; 1127 } else if (strcmp(token, "metaspace") == 0) { 1128 verify_flags |= Verify_MetaspaceUtils; 1129 } else if (strcmp(token, "jni_handles") == 0) { 1130 verify_flags |= Verify_JNIHandles; 1131 } else if (strcmp(token, "codecache_oops") == 0) { 1132 verify_flags |= Verify_CodeCacheOops; 1133 } else if (strcmp(token, "resolved_method_table") == 0) { 1134 verify_flags |= Verify_ResolvedMethodTable; 1135 } else if (strcmp(token, "stringdedup") == 0) { 1136 verify_flags |= Verify_StringDedup; 1137 } else { 1138 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1139 } 1140 token = strtok_r(nullptr, delimiter, &save_ptr); 1141 } 1142 FREE_C_HEAP_ARRAY(char, subset_list); 1143 } 1144 1145 bool Universe::should_verify_subset(uint subset) { 1146 if (verify_flags & subset) { 1147 return true; 1148 } 1149 return false; 1150 } 1151 1152 void Universe::verify(VerifyOption option, const char* prefix) { 1153 COMPILER2_PRESENT( 1154 assert(!DerivedPointerTable::is_active(), 1155 "DPT should not be active during verification " 1156 "(of thread stacks below)"); 1157 ) 1158 1159 Thread* thread = Thread::current(); 1160 ResourceMark rm(thread); 1161 HandleMark hm(thread); // Handles created during verification can be zapped 1162 _verify_count++; 1163 1164 FormatBuffer<> title("Verifying %s", prefix); 1165 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1166 if (should_verify_subset(Verify_Threads)) { 1167 log_debug(gc, verify)("Threads"); 1168 Threads::verify(); 1169 } 1170 if (should_verify_subset(Verify_Heap)) { 1171 log_debug(gc, verify)("Heap"); 1172 heap()->verify(option); 1173 } 1174 if (should_verify_subset(Verify_SymbolTable)) { 1175 log_debug(gc, verify)("SymbolTable"); 1176 SymbolTable::verify(); 1177 } 1178 if (should_verify_subset(Verify_StringTable)) { 1179 log_debug(gc, verify)("StringTable"); 1180 StringTable::verify(); 1181 } 1182 if (should_verify_subset(Verify_CodeCache)) { 1183 log_debug(gc, verify)("CodeCache"); 1184 CodeCache::verify(); 1185 } 1186 if (should_verify_subset(Verify_SystemDictionary)) { 1187 log_debug(gc, verify)("SystemDictionary"); 1188 SystemDictionary::verify(); 1189 } 1190 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1191 log_debug(gc, verify)("ClassLoaderDataGraph"); 1192 ClassLoaderDataGraph::verify(); 1193 } 1194 if (should_verify_subset(Verify_MetaspaceUtils)) { 1195 log_debug(gc, verify)("MetaspaceUtils"); 1196 DEBUG_ONLY(MetaspaceUtils::verify();) 1197 } 1198 if (should_verify_subset(Verify_JNIHandles)) { 1199 log_debug(gc, verify)("JNIHandles"); 1200 JNIHandles::verify(); 1201 } 1202 if (should_verify_subset(Verify_CodeCacheOops)) { 1203 log_debug(gc, verify)("CodeCache Oops"); 1204 CodeCache::verify_oops(); 1205 } 1206 if (should_verify_subset(Verify_ResolvedMethodTable)) { 1207 log_debug(gc, verify)("ResolvedMethodTable Oops"); 1208 ResolvedMethodTable::verify(); 1209 } 1210 if (should_verify_subset(Verify_StringDedup)) { 1211 log_debug(gc, verify)("String Deduplication"); 1212 StringDedup::verify(); 1213 } 1214 } 1215 1216 1217 #ifndef PRODUCT 1218 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1219 assert(low_boundary < high_boundary, "bad interval"); 1220 1221 // decide which low-order bits we require to be clear: 1222 size_t alignSize = MinObjAlignmentInBytes; 1223 size_t min_object_size = CollectedHeap::min_fill_size(); 1224 1225 // make an inclusive limit: 1226 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1227 uintptr_t min = (uintptr_t)low_boundary; 1228 assert(min < max, "bad interval"); 1229 uintptr_t diff = max ^ min; 1230 1231 // throw away enough low-order bits to make the diff vanish 1232 uintptr_t mask = (uintptr_t)(-1); 1233 while ((mask & diff) != 0) 1234 mask <<= 1; 1235 uintptr_t bits = (min & mask); 1236 assert(bits == (max & mask), "correct mask"); 1237 // check an intermediate value between min and max, just to make sure: 1238 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1239 1240 // require address alignment, too: 1241 mask |= (alignSize - 1); 1242 1243 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1244 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1245 } 1246 _verify_oop_mask = mask; 1247 _verify_oop_bits = bits; 1248 } 1249 1250 void Universe::set_verify_data(uintptr_t mask, uintptr_t bits) { 1251 _verify_oop_mask = mask; 1252 _verify_oop_bits = bits; 1253 } 1254 1255 // Oop verification (see MacroAssembler::verify_oop) 1256 1257 uintptr_t Universe::verify_oop_mask() { 1258 return _verify_oop_mask; 1259 } 1260 1261 uintptr_t Universe::verify_oop_bits() { 1262 return _verify_oop_bits; 1263 } 1264 1265 uintptr_t Universe::verify_mark_mask() { 1266 return markWord::lock_mask_in_place; 1267 } 1268 1269 uintptr_t Universe::verify_mark_bits() { 1270 intptr_t mask = verify_mark_mask(); 1271 intptr_t bits = (intptr_t)markWord::prototype().value(); 1272 assert((bits & ~mask) == 0, "no stray header bits"); 1273 return bits; 1274 } 1275 #endif // PRODUCT 1276 1277 1278 void LatestMethodCache::init(Klass* k, Method* m) { 1279 if (!UseSharedSpaces) { 1280 _klass = k; 1281 } 1282 #ifndef PRODUCT 1283 else { 1284 // sharing initialization should have already set up _klass 1285 assert(_klass != nullptr, "just checking"); 1286 } 1287 #endif 1288 1289 _method_idnum = m->method_idnum(); 1290 assert(_method_idnum >= 0, "sanity check"); 1291 } 1292 1293 1294 Method* LatestMethodCache::get_method() { 1295 if (klass() == nullptr) return nullptr; 1296 InstanceKlass* ik = InstanceKlass::cast(klass()); 1297 Method* m = ik->method_with_idnum(method_idnum()); 1298 assert(m != nullptr, "sanity check"); 1299 return m; 1300 } 1301 1302 void LatestMethodCache::serialize(SerializeClosure* f) { 1303 f->do_ptr(&_klass); 1304 } 1305 1306 #ifdef ASSERT 1307 // Release dummy object(s) at bottom of heap 1308 bool Universe::release_fullgc_alot_dummy() { 1309 MutexLocker ml(FullGCALot_lock); 1310 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve(); 1311 if (fullgc_alot_dummy_array != nullptr) { 1312 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) { 1313 // No more dummies to release, release entire array instead 1314 _fullgc_alot_dummy_array.release(Universe::vm_global()); 1315 _fullgc_alot_dummy_array = OopHandle(); // null out OopStorage pointer. 1316 return false; 1317 } 1318 1319 // Release dummy at bottom of old generation 1320 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, nullptr); 1321 } 1322 return true; 1323 } 1324 1325 bool Universe::is_gc_active() { 1326 return heap()->is_gc_active(); 1327 } 1328 1329 bool Universe::is_in_heap(const void* p) { 1330 return heap()->is_in(p); 1331 } 1332 1333 #endif // ASSERT