1 /* 2 * Copyright (c) 1997, 2020, 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 "aot/aotLoader.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/classLoaderDataGraph.hpp" 29 #include "classfile/javaClasses.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/symbolTable.hpp" 32 #include "classfile/systemDictionary.hpp" 33 #include "classfile/vmSymbols.hpp" 34 #include "code/codeBehaviours.hpp" 35 #include "code/codeCache.hpp" 36 #include "code/dependencies.hpp" 37 #include "gc/shared/collectedHeap.inline.hpp" 38 #include "gc/shared/gcArguments.hpp" 39 #include "gc/shared/gcConfig.hpp" 40 #include "gc/shared/gcTraceTime.inline.hpp" 41 #include "interpreter/interpreter.hpp" 42 #include "logging/log.hpp" 43 #include "logging/logStream.hpp" 44 #include "memory/heapShared.hpp" 45 #include "memory/filemap.hpp" 46 #include "memory/metadataFactory.hpp" 47 #include "memory/metaspaceClosure.hpp" 48 #include "memory/metaspaceCounters.hpp" 49 #include "memory/metaspaceShared.hpp" 50 #include "memory/oopFactory.hpp" 51 #include "memory/resourceArea.hpp" 52 #include "memory/universe.hpp" 53 #include "oops/compressedOops.hpp" 54 #include "oops/constantPool.hpp" 55 #include "oops/instanceClassLoaderKlass.hpp" 56 #include "oops/instanceKlass.hpp" 57 #include "oops/instanceMirrorKlass.hpp" 58 #include "oops/instanceRefKlass.hpp" 59 #include "oops/objArrayOop.inline.hpp" 60 #include "oops/oop.inline.hpp" 61 #include "oops/typeArrayKlass.hpp" 62 #include "prims/resolvedMethodTable.hpp" 63 #include "runtime/arguments.hpp" 64 #include "runtime/atomic.hpp" 65 #include "runtime/deoptimization.hpp" 66 #include "runtime/flags/flagSetting.hpp" 67 #include "runtime/flags/jvmFlagConstraintList.hpp" 68 #include "runtime/handles.inline.hpp" 69 #include "runtime/init.hpp" 70 #include "runtime/java.hpp" 71 #include "runtime/javaCalls.hpp" 72 #include "runtime/sharedRuntime.hpp" 73 #include "runtime/synchronizer.hpp" 74 #include "runtime/thread.inline.hpp" 75 #include "runtime/timerTrace.hpp" 76 #include "runtime/vmOperations.hpp" 77 #include "services/memoryService.hpp" 78 #include "utilities/align.hpp" 79 #include "utilities/copy.hpp" 80 #include "utilities/debug.hpp" 81 #include "utilities/events.hpp" 82 #include "utilities/formatBuffer.hpp" 83 #include "utilities/hashtable.inline.hpp" 84 #include "utilities/macros.hpp" 85 #include "utilities/ostream.hpp" 86 #include "utilities/preserveException.hpp" 87 88 #define PRIMITIVE_MIRRORS_DO(func) \ 89 func(_int_mirror) \ 90 func(_float_mirror) \ 91 func(_double_mirror) \ 92 func(_byte_mirror) \ 93 func(_bool_mirror) \ 94 func(_char_mirror) \ 95 func(_long_mirror) \ 96 func(_short_mirror) \ 97 func(_void_mirror) 98 99 #define DEFINE_PRIMITIVE_MIRROR(m) \ 100 oop Universe::m = NULL; 101 102 // Known objects 103 PRIMITIVE_MIRRORS_DO(DEFINE_PRIMITIVE_MIRROR) 104 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ }; 105 Klass* Universe::_objectArrayKlassObj = NULL; 106 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 107 oop Universe::_main_thread_group = NULL; 108 oop Universe::_system_thread_group = NULL; 109 objArrayOop Universe::_the_empty_class_klass_array = NULL; 110 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 111 oop Universe::_the_null_sentinel = NULL; 112 oop Universe::_the_null_string = NULL; 113 oop Universe::_the_min_jint_string = NULL; 114 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 115 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 116 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 117 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL; 118 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 119 oop Universe::_out_of_memory_error_java_heap = NULL; 120 oop Universe::_out_of_memory_error_metaspace = NULL; 121 oop Universe::_out_of_memory_error_class_metaspace = NULL; 122 oop Universe::_out_of_memory_error_array_size = NULL; 123 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 124 oop Universe::_out_of_memory_error_realloc_objects = NULL; 125 oop Universe::_out_of_memory_error_retry = NULL; 126 oop Universe::_delayed_stack_overflow_error_message = NULL; 127 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 128 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 129 bool Universe::_verify_in_progress = false; 130 long Universe::verify_flags = Universe::Verify_All; 131 oop Universe::_null_ptr_exception_instance = NULL; 132 oop Universe::_arithmetic_exception_instance = NULL; 133 oop Universe::_virtual_machine_error_instance = NULL; 134 oop Universe::_vm_exception = NULL; 135 oop Universe::_reference_pending_list = NULL; 136 137 Array<int>* Universe::_the_empty_int_array = NULL; 138 Array<u2>* Universe::_the_empty_short_array = NULL; 139 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 140 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL; 141 Array<Method*>* Universe::_the_empty_method_array = NULL; 142 143 // These variables are guarded by FullGCALot_lock. 144 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 145 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 146 147 // Heap 148 int Universe::_verify_count = 0; 149 150 // Oop verification (see MacroAssembler::verify_oop) 151 uintptr_t Universe::_verify_oop_mask = 0; 152 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 153 154 int Universe::_base_vtable_size = 0; 155 bool Universe::_bootstrapping = false; 156 bool Universe::_module_initialized = false; 157 bool Universe::_fully_initialized = false; 158 159 size_t Universe::_heap_capacity_at_last_gc; 160 size_t Universe::_heap_used_at_last_gc = 0; 161 162 CollectedHeap* Universe::_collectedHeap = NULL; 163 164 void Universe::basic_type_classes_do(void f(Klass*)) { 165 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 166 f(_typeArrayKlassObjs[i]); 167 } 168 } 169 170 void Universe::basic_type_classes_do(KlassClosure *closure) { 171 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 172 closure->do_klass(_typeArrayKlassObjs[i]); 173 } 174 } 175 176 #define DO_PRIMITIVE_MIRROR(m) \ 177 f->do_oop((oop*) &m); 178 179 void Universe::oops_do(OopClosure* f) { 180 PRIMITIVE_MIRRORS_DO(DO_PRIMITIVE_MIRROR); 181 182 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 183 f->do_oop((oop*) &_mirrors[i]); 184 } 185 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 186 187 f->do_oop((oop*)&_the_empty_class_klass_array); 188 f->do_oop((oop*)&_the_null_sentinel); 189 f->do_oop((oop*)&_the_null_string); 190 f->do_oop((oop*)&_the_min_jint_string); 191 f->do_oop((oop*)&_out_of_memory_error_java_heap); 192 f->do_oop((oop*)&_out_of_memory_error_metaspace); 193 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 194 f->do_oop((oop*)&_out_of_memory_error_array_size); 195 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 196 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 197 f->do_oop((oop*)&_out_of_memory_error_retry); 198 f->do_oop((oop*)&_delayed_stack_overflow_error_message); 199 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 200 f->do_oop((oop*)&_null_ptr_exception_instance); 201 f->do_oop((oop*)&_arithmetic_exception_instance); 202 f->do_oop((oop*)&_virtual_machine_error_instance); 203 f->do_oop((oop*)&_main_thread_group); 204 f->do_oop((oop*)&_system_thread_group); 205 f->do_oop((oop*)&_vm_exception); 206 f->do_oop((oop*)&_reference_pending_list); 207 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 208 ThreadsSMRSupport::exiting_threads_oops_do(f); 209 } 210 211 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 212 it->push(&_klass); 213 } 214 215 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 216 for (int i = 0; i < T_LONG+1; i++) { 217 it->push(&_typeArrayKlassObjs[i]); 218 } 219 it->push(&_objectArrayKlassObj); 220 221 it->push(&_the_empty_int_array); 222 it->push(&_the_empty_short_array); 223 it->push(&_the_empty_klass_array); 224 it->push(&_the_empty_instance_klass_array); 225 it->push(&_the_empty_method_array); 226 it->push(&_the_array_interfaces_array); 227 228 _finalizer_register_cache->metaspace_pointers_do(it); 229 _loader_addClass_cache->metaspace_pointers_do(it); 230 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 231 _throw_no_such_method_error_cache->metaspace_pointers_do(it); 232 _do_stack_walk_cache->metaspace_pointers_do(it); 233 } 234 235 #define ASSERT_MIRROR_NULL(m) \ 236 assert(m == NULL, "archived mirrors should be NULL"); 237 238 #define SERIALIZE_MIRROR(m) \ 239 f->do_oop(&m); \ 240 if (m != NULL) { java_lang_Class::update_archived_primitive_mirror_native_pointers(m); } 241 242 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive 243 void Universe::serialize(SerializeClosure* f) { 244 245 for (int i = 0; i < T_LONG+1; i++) { 246 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 247 } 248 249 f->do_ptr((void**)&_objectArrayKlassObj); 250 251 #if INCLUDE_CDS_JAVA_HEAP 252 DEBUG_ONLY(if (DumpSharedSpaces && !HeapShared::is_heap_object_archiving_allowed()) { 253 PRIMITIVE_MIRRORS_DO(ASSERT_MIRROR_NULL); 254 }); 255 PRIMITIVE_MIRRORS_DO(SERIALIZE_MIRROR); 256 #endif 257 258 f->do_ptr((void**)&_the_array_interfaces_array); 259 f->do_ptr((void**)&_the_empty_int_array); 260 f->do_ptr((void**)&_the_empty_short_array); 261 f->do_ptr((void**)&_the_empty_method_array); 262 f->do_ptr((void**)&_the_empty_klass_array); 263 f->do_ptr((void**)&_the_empty_instance_klass_array); 264 _finalizer_register_cache->serialize(f); 265 _loader_addClass_cache->serialize(f); 266 _throw_illegal_access_error_cache->serialize(f); 267 _throw_no_such_method_error_cache->serialize(f); 268 _do_stack_walk_cache->serialize(f); 269 } 270 271 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 272 if (size < alignment || size % alignment != 0) { 273 vm_exit_during_initialization( 274 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 275 } 276 } 277 278 void initialize_basic_type_klass(Klass* k, TRAPS) { 279 Klass* ok = SystemDictionary::Object_klass(); 280 #if INCLUDE_CDS 281 if (UseSharedSpaces) { 282 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 283 assert(k->super() == ok, "u3"); 284 if (k->is_instance_klass()) { 285 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK); 286 } else { 287 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK); 288 } 289 } else 290 #endif 291 { 292 k->initialize_supers(ok, NULL, CHECK); 293 } 294 k->append_to_sibling_list(); 295 } 296 297 void Universe::genesis(TRAPS) { 298 ResourceMark rm(THREAD); 299 300 { FlagSetting fs(_bootstrapping, true); 301 302 { MutexLocker mc(THREAD, Compile_lock); 303 304 java_lang_Class::allocate_fixup_lists(); 305 306 // determine base vtable size; without that we cannot create the array klasses 307 compute_base_vtable_size(); 308 309 if (!UseSharedSpaces) { 310 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 311 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 312 } 313 314 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 315 316 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 317 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 318 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 319 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 320 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 321 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 322 } 323 } 324 325 vmSymbols::initialize(CHECK); 326 327 SystemDictionary::initialize(CHECK); 328 329 Klass* ok = SystemDictionary::Object_klass(); 330 331 _the_null_string = StringTable::intern("null", CHECK); 332 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 333 334 #if INCLUDE_CDS 335 if (UseSharedSpaces) { 336 // Verify shared interfaces array. 337 assert(_the_array_interfaces_array->at(0) == 338 SystemDictionary::Cloneable_klass(), "u3"); 339 assert(_the_array_interfaces_array->at(1) == 340 SystemDictionary::Serializable_klass(), "u3"); 341 } else 342 #endif 343 { 344 // Set up shared interfaces array. (Do this before supers are set up.) 345 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 346 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 347 } 348 349 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 350 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 351 initialize_basic_type_klass(floatArrayKlassObj(), CHECK); 352 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 353 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 354 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 355 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 356 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 357 } // end of core bootstrapping 358 359 { 360 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 361 _the_null_sentinel = tns(); 362 } 363 364 // Maybe this could be lifted up now that object array can be initialized 365 // during the bootstrapping. 366 367 // OLD 368 // Initialize _objectArrayKlass after core bootstraping to make 369 // sure the super class is set up properly for _objectArrayKlass. 370 // --- 371 // NEW 372 // Since some of the old system object arrays have been converted to 373 // ordinary object arrays, _objectArrayKlass will be loaded when 374 // SystemDictionary::initialize(CHECK); is run. See the extra check 375 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 376 _objectArrayKlassObj = InstanceKlass:: 377 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 378 // OLD 379 // Add the class to the class hierarchy manually to make sure that 380 // its vtable is initialized after core bootstrapping is completed. 381 // --- 382 // New 383 // Have already been initialized. 384 _objectArrayKlassObj->append_to_sibling_list(); 385 386 #ifdef ASSERT 387 if (FullGCALot) { 388 // Allocate an array of dummy objects. 389 // We'd like these to be at the bottom of the old generation, 390 // so that when we free one and then collect, 391 // (almost) the whole heap moves 392 // and we find out if we actually update all the oops correctly. 393 // But we can't allocate directly in the old generation, 394 // so we allocate wherever, and hope that the first collection 395 // moves these objects to the bottom of the old generation. 396 // We can allocate directly in the permanent generation, so we do. 397 int size = FullGCALotDummies * 2; 398 399 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 400 objArrayHandle dummy_array(THREAD, naked_array); 401 int i = 0; 402 while (i < size) { 403 // Allocate dummy in old generation 404 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 405 dummy_array->obj_at_put(i++, dummy); 406 } 407 { 408 // Only modify the global variable inside the mutex. 409 // If we had a race to here, the other dummy_array instances 410 // and their elements just get dropped on the floor, which is fine. 411 MutexLocker ml(THREAD, FullGCALot_lock); 412 if (_fullgc_alot_dummy_array == NULL) { 413 _fullgc_alot_dummy_array = dummy_array(); 414 } 415 } 416 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 417 } 418 #endif 419 } 420 421 #define ASSERT_MIRROR_NOT_NULL(m) \ 422 assert(m != NULL, "archived mirrors should not be NULL"); 423 424 void Universe::initialize_basic_type_mirrors(TRAPS) { 425 #if INCLUDE_CDS_JAVA_HEAP 426 if (UseSharedSpaces && 427 HeapShared::open_archive_heap_region_mapped() && 428 _int_mirror != NULL) { 429 assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity"); 430 PRIMITIVE_MIRRORS_DO(ASSERT_MIRROR_NOT_NULL); 431 } else 432 // _int_mirror could be NULL if archived heap is not mapped. 433 #endif 434 { 435 _int_mirror = 436 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 437 _float_mirror = 438 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 439 _double_mirror = 440 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 441 _byte_mirror = 442 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 443 _bool_mirror = 444 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 445 _char_mirror = 446 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 447 _long_mirror = 448 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 449 _short_mirror = 450 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 451 _void_mirror = 452 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 453 } 454 455 _mirrors[T_INT] = _int_mirror; 456 _mirrors[T_FLOAT] = _float_mirror; 457 _mirrors[T_DOUBLE] = _double_mirror; 458 _mirrors[T_BYTE] = _byte_mirror; 459 _mirrors[T_BOOLEAN] = _bool_mirror; 460 _mirrors[T_CHAR] = _char_mirror; 461 _mirrors[T_LONG] = _long_mirror; 462 _mirrors[T_SHORT] = _short_mirror; 463 _mirrors[T_VOID] = _void_mirror; 464 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 465 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 466 } 467 468 void Universe::fixup_mirrors(TRAPS) { 469 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 470 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 471 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 472 // that the number of objects allocated at this point is very small. 473 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 474 HandleMark hm(THREAD); 475 476 if (!UseSharedSpaces) { 477 // Cache the start of the static fields 478 InstanceMirrorKlass::init_offset_of_static_fields(); 479 } 480 481 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 482 int list_length = list->length(); 483 for (int i = 0; i < list_length; i++) { 484 Klass* k = list->at(i); 485 assert(k->is_klass(), "List should only hold classes"); 486 EXCEPTION_MARK; 487 java_lang_Class::fixup_mirror(k, CATCH); 488 } 489 delete java_lang_Class::fixup_mirror_list(); 490 java_lang_Class::set_fixup_mirror_list(NULL); 491 } 492 493 #define assert_pll_locked(test) \ 494 assert(Heap_lock->test(), "Reference pending list access requires lock") 495 496 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 497 498 oop Universe::reference_pending_list() { 499 if (Thread::current()->is_VM_thread()) { 500 assert_pll_locked(is_locked); 501 } else { 502 assert_pll_ownership(); 503 } 504 return _reference_pending_list; 505 } 506 507 void Universe::set_reference_pending_list(oop list) { 508 assert_pll_ownership(); 509 _reference_pending_list = list; 510 } 511 512 bool Universe::has_reference_pending_list() { 513 assert_pll_ownership(); 514 return _reference_pending_list != NULL; 515 } 516 517 oop Universe::swap_reference_pending_list(oop list) { 518 assert_pll_locked(is_locked); 519 return Atomic::xchg(&_reference_pending_list, list); 520 } 521 522 #undef assert_pll_locked 523 #undef assert_pll_ownership 524 525 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) { 526 // init vtable of k and all subclasses 527 ko->vtable().initialize_vtable(false, CHECK); 528 if (ko->is_instance_klass()) { 529 for (Klass* sk = ko->subklass(); 530 sk != NULL; 531 sk = sk->next_sibling()) { 532 reinitialize_vtable_of(sk, CHECK); 533 } 534 } 535 } 536 537 void Universe::reinitialize_vtables(TRAPS) { 538 // The vtables are initialized by starting at java.lang.Object and 539 // initializing through the subclass links, so that the super 540 // classes are always initialized first. 541 Klass* ok = SystemDictionary::Object_klass(); 542 Universe::reinitialize_vtable_of(ok, THREAD); 543 } 544 545 546 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) { 547 k->itable().initialize_itable(false, CHECK); 548 } 549 550 551 void Universe::reinitialize_itables(TRAPS) { 552 MutexLocker mcld(THREAD, ClassLoaderDataGraph_lock); 553 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK); 554 } 555 556 557 bool Universe::on_page_boundary(void* addr) { 558 return is_aligned(addr, os::vm_page_size()); 559 } 560 561 562 bool Universe::should_fill_in_stack_trace(Handle throwable) { 563 // never attempt to fill in the stack trace of preallocated errors that do not have 564 // backtrace. These errors are kept alive forever and may be "re-used" when all 565 // preallocated errors with backtrace have been consumed. Also need to avoid 566 // a potential loop which could happen if an out of memory occurs when attempting 567 // to allocate the backtrace. 568 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 569 (throwable() != Universe::_out_of_memory_error_metaspace) && 570 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 571 (throwable() != Universe::_out_of_memory_error_array_size) && 572 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) && 573 (throwable() != Universe::_out_of_memory_error_realloc_objects) && 574 (throwable() != Universe::_out_of_memory_error_retry)); 575 } 576 577 578 oop Universe::gen_out_of_memory_error(oop default_err) { 579 // generate an out of memory error: 580 // - if there is a preallocated error and stack traces are available 581 // (j.l.Throwable is initialized), then return the preallocated 582 // error with a filled in stack trace, and with the message 583 // provided by the default error. 584 // - otherwise, return the default error, without a stack trace. 585 int next; 586 if ((_preallocated_out_of_memory_error_avail_count > 0) && 587 SystemDictionary::Throwable_klass()->is_initialized()) { 588 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1); 589 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 590 } else { 591 next = -1; 592 } 593 if (next < 0) { 594 // all preallocated errors have been used. 595 // return default 596 return default_err; 597 } else { 598 Thread* THREAD = Thread::current(); 599 Handle default_err_h(THREAD, default_err); 600 // get the error object at the slot and set set it to NULL so that the 601 // array isn't keeping it alive anymore. 602 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next)); 603 assert(exc() != NULL, "slot has been used already"); 604 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 605 606 // use the message from the default error 607 oop msg = java_lang_Throwable::message(default_err_h()); 608 assert(msg != NULL, "no message"); 609 java_lang_Throwable::set_message(exc(), msg); 610 611 // populate the stack trace and return it. 612 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 613 return exc(); 614 } 615 } 616 617 intptr_t Universe::_non_oop_bits = 0; 618 619 void* Universe::non_oop_word() { 620 // Neither the high bits nor the low bits of this value is allowed 621 // to look like (respectively) the high or low bits of a real oop. 622 // 623 // High and low are CPU-specific notions, but low always includes 624 // the low-order bit. Since oops are always aligned at least mod 4, 625 // setting the low-order bit will ensure that the low half of the 626 // word will never look like that of a real oop. 627 // 628 // Using the OS-supplied non-memory-address word (usually 0 or -1) 629 // will take care of the high bits, however many there are. 630 631 if (_non_oop_bits == 0) { 632 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 633 } 634 635 return (void*)_non_oop_bits; 636 } 637 638 static void initialize_global_behaviours() { 639 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour()); 640 } 641 642 jint universe_init() { 643 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 644 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 645 "LogHeapWordSize is incorrect."); 646 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 647 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 648 "oop size is not not a multiple of HeapWord size"); 649 650 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 651 652 JavaClasses::compute_hard_coded_offsets(); 653 654 initialize_global_behaviours(); 655 656 GCConfig::arguments()->initialize_heap_sizes(); 657 658 jint status = Universe::initialize_heap(); 659 if (status != JNI_OK) { 660 return status; 661 } 662 663 Universe::initialize_tlab(); 664 665 Metaspace::global_initialize(); 666 667 // Initialize performance counters for metaspaces 668 MetaspaceCounters::initialize_performance_counters(); 669 CompressedClassSpaceCounters::initialize_performance_counters(); 670 671 AOTLoader::universe_init(); 672 673 // Checks 'AfterMemoryInit' constraints. 674 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) { 675 return JNI_EINVAL; 676 } 677 678 // Create memory for metadata. Must be after initializing heap for 679 // DumpSharedSpaces. 680 ClassLoaderData::init_null_class_loader_data(); 681 682 // We have a heap so create the Method* caches before 683 // Metaspace::initialize_shared_spaces() tries to populate them. 684 Universe::_finalizer_register_cache = new LatestMethodCache(); 685 Universe::_loader_addClass_cache = new LatestMethodCache(); 686 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 687 Universe::_throw_no_such_method_error_cache = new LatestMethodCache(); 688 Universe::_do_stack_walk_cache = new LatestMethodCache(); 689 690 #if INCLUDE_CDS 691 if (UseSharedSpaces) { 692 // Read the data structures supporting the shared spaces (shared 693 // system dictionary, symbol table, etc.). After that, access to 694 // the file (other than the mapped regions) is no longer needed, and 695 // the file is closed. Closing the file does not affect the 696 // currently mapped regions. 697 MetaspaceShared::initialize_shared_spaces(); 698 StringTable::create_table(); 699 } else 700 #endif 701 { 702 SymbolTable::create_table(); 703 StringTable::create_table(); 704 } 705 706 #if INCLUDE_CDS 707 if (Arguments::is_dumping_archive()) { 708 MetaspaceShared::prepare_for_dumping(); 709 } 710 #endif 711 712 if (strlen(VerifySubSet) > 0) { 713 Universe::initialize_verify_flags(); 714 } 715 716 ResolvedMethodTable::create_table(); 717 718 return JNI_OK; 719 } 720 721 jint Universe::initialize_heap() { 722 assert(_collectedHeap == NULL, "Heap already created"); 723 _collectedHeap = GCConfig::arguments()->create_heap(); 724 jint status = _collectedHeap->initialize(); 725 726 if (status == JNI_OK) { 727 log_info(gc)("Using %s", _collectedHeap->name()); 728 } 729 730 return status; 731 } 732 733 void Universe::initialize_tlab() { 734 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 735 if (UseTLAB) { 736 assert(Universe::heap()->supports_tlab_allocation(), 737 "Should support thread-local allocation buffers"); 738 ThreadLocalAllocBuffer::startup_initialization(); 739 } 740 } 741 742 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 743 744 assert(alignment <= Arguments::conservative_max_heap_alignment(), 745 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 746 alignment, Arguments::conservative_max_heap_alignment()); 747 748 size_t total_reserved = align_up(heap_size, alignment); 749 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 750 "heap size is too big for compressed oops"); 751 752 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size()); 753 assert(!UseLargePages 754 || UseParallelGC 755 || use_large_pages, "Wrong alignment to use large pages"); 756 757 // Now create the space. 758 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt); 759 760 if (total_rs.is_reserved()) { 761 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 762 "must be exactly of required size and alignment"); 763 // We are good. 764 765 if (AllocateHeapAt != NULL) { 766 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 767 } 768 769 if (UseCompressedOops) { 770 CompressedOops::initialize(total_rs); 771 } 772 773 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end()); 774 775 return total_rs; 776 } 777 778 vm_exit_during_initialization( 779 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 780 total_reserved/K)); 781 782 // satisfy compiler 783 ShouldNotReachHere(); 784 return ReservedHeapSpace(0, 0, false); 785 } 786 787 788 // It's the caller's responsibility to ensure glitch-freedom 789 // (if required). 790 void Universe::update_heap_info_at_gc() { 791 _heap_capacity_at_last_gc = heap()->capacity(); 792 _heap_used_at_last_gc = heap()->used(); 793 } 794 795 void initialize_known_method(LatestMethodCache* method_cache, 796 InstanceKlass* ik, 797 const char* method, 798 Symbol* signature, 799 bool is_static, TRAPS) 800 { 801 TempNewSymbol name = SymbolTable::new_symbol(method); 802 Method* m = NULL; 803 // The klass must be linked before looking up the method. 804 if (!ik->link_class_or_fail(THREAD) || 805 ((m = ik->find_method(name, signature)) == NULL) || 806 is_static != m->is_static()) { 807 ResourceMark rm(THREAD); 808 // NoSuchMethodException doesn't actually work because it tries to run the 809 // <init> function before java_lang_Class is linked. Print error and exit. 810 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 811 ik->name()->as_C_string(), method)); 812 } 813 method_cache->init(ik, m); 814 } 815 816 void Universe::initialize_known_methods(TRAPS) { 817 // Set up static method for registering finalizers 818 initialize_known_method(_finalizer_register_cache, 819 SystemDictionary::Finalizer_klass(), 820 "register", 821 vmSymbols::object_void_signature(), true, CHECK); 822 823 initialize_known_method(_throw_illegal_access_error_cache, 824 SystemDictionary::internal_Unsafe_klass(), 825 "throwIllegalAccessError", 826 vmSymbols::void_method_signature(), true, CHECK); 827 828 initialize_known_method(_throw_no_such_method_error_cache, 829 SystemDictionary::internal_Unsafe_klass(), 830 "throwNoSuchMethodError", 831 vmSymbols::void_method_signature(), true, CHECK); 832 833 // Set up method for registering loaded classes in class loader vector 834 initialize_known_method(_loader_addClass_cache, 835 SystemDictionary::ClassLoader_klass(), 836 "addClass", 837 vmSymbols::class_void_signature(), false, CHECK); 838 839 // Set up method for stack walking 840 initialize_known_method(_do_stack_walk_cache, 841 SystemDictionary::AbstractStackWalker_klass(), 842 "doStackWalk", 843 vmSymbols::doStackWalk_signature(), false, CHECK); 844 } 845 846 void universe2_init() { 847 EXCEPTION_MARK; 848 Universe::genesis(CATCH); 849 } 850 851 // Set after initialization of the module runtime, call_initModuleRuntime 852 void universe_post_module_init() { 853 Universe::_module_initialized = true; 854 } 855 856 bool universe_post_init() { 857 assert(!is_init_completed(), "Error: initialization not yet completed!"); 858 Universe::_fully_initialized = true; 859 EXCEPTION_MARK; 860 if (!UseSharedSpaces) { 861 ResourceMark rm; 862 Universe::reinitialize_vtables(CHECK_false); 863 Universe::reinitialize_itables(CHECK_false); 864 } 865 866 HandleMark hm(THREAD); 867 // Setup preallocated empty java.lang.Class array 868 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 869 870 // Setup preallocated OutOfMemoryError errors 871 Klass* k = SystemDictionary::OutOfMemoryError_klass(); 872 InstanceKlass* ik = InstanceKlass::cast(k); 873 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false); 874 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false); 875 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false); 876 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false); 877 Universe::_out_of_memory_error_gc_overhead_limit = 878 ik->allocate_instance(CHECK_false); 879 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false); 880 Universe::_out_of_memory_error_retry = ik->allocate_instance(CHECK_false); 881 882 // Setup preallocated cause message for delayed StackOverflowError 883 if (StackReservedPages > 0) { 884 Universe::_delayed_stack_overflow_error_message = 885 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 886 } 887 888 // Setup preallocated NullPointerException 889 // (this is currently used for a cheap & dirty solution in compiler exception handling) 890 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 891 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 892 // Setup preallocated ArithmeticException 893 // (this is currently used for a cheap & dirty solution in compiler exception handling) 894 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 895 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 896 // Virtual Machine Error for when we get into a situation we can't resolve 897 k = SystemDictionary::VirtualMachineError_klass(); 898 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 899 if (!linked) { 900 tty->print_cr("Unable to link/verify VirtualMachineError class"); 901 return false; // initialization failed 902 } 903 Universe::_virtual_machine_error_instance = 904 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 905 906 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 907 908 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 909 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 910 911 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 912 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 913 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 914 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 915 916 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 917 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 918 919 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 920 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 921 922 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 923 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 924 925 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK_false); 926 java_lang_Throwable::set_message(Universe::_out_of_memory_error_retry, msg()); 927 928 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 929 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 930 931 // Setup the array of errors that have preallocated backtrace 932 k = Universe::_out_of_memory_error_java_heap->klass(); 933 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 934 ik = InstanceKlass::cast(k); 935 936 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 937 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false); 938 for (int i=0; i<len; i++) { 939 oop err = ik->allocate_instance(CHECK_false); 940 Handle err_h = Handle(THREAD, err); 941 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 942 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 943 } 944 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 945 946 Universe::initialize_known_methods(CHECK_false); 947 948 // This needs to be done before the first scavenge/gc, since 949 // it's an input to soft ref clearing policy. 950 { 951 MutexLocker x(THREAD, Heap_lock); 952 Universe::update_heap_info_at_gc(); 953 } 954 955 // ("weak") refs processing infrastructure initialization 956 Universe::heap()->post_initialize(); 957 958 MemoryService::add_metaspace_memory_pools(); 959 960 MemoryService::set_universe_heap(Universe::heap()); 961 #if INCLUDE_CDS 962 MetaspaceShared::post_initialize(CHECK_false); 963 #endif 964 return true; 965 } 966 967 968 void Universe::compute_base_vtable_size() { 969 _base_vtable_size = ClassLoader::compute_Object_vtable(); 970 } 971 972 void Universe::print_on(outputStream* st) { 973 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 974 st->print_cr("Heap"); 975 heap()->print_on(st); 976 } 977 978 void Universe::print_heap_at_SIGBREAK() { 979 if (PrintHeapAtSIGBREAK) { 980 print_on(tty); 981 tty->cr(); 982 tty->flush(); 983 } 984 } 985 986 void Universe::print_heap_before_gc() { 987 LogTarget(Debug, gc, heap) lt; 988 if (lt.is_enabled()) { 989 LogStream ls(lt); 990 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 991 ResourceMark rm; 992 heap()->print_on(&ls); 993 } 994 } 995 996 void Universe::print_heap_after_gc() { 997 LogTarget(Debug, gc, heap) lt; 998 if (lt.is_enabled()) { 999 LogStream ls(lt); 1000 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1001 ResourceMark rm; 1002 heap()->print_on(&ls); 1003 } 1004 } 1005 1006 void Universe::initialize_verify_flags() { 1007 verify_flags = 0; 1008 const char delimiter[] = " ,"; 1009 1010 size_t length = strlen(VerifySubSet); 1011 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1012 strncpy(subset_list, VerifySubSet, length + 1); 1013 char* save_ptr; 1014 1015 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1016 while (token != NULL) { 1017 if (strcmp(token, "threads") == 0) { 1018 verify_flags |= Verify_Threads; 1019 } else if (strcmp(token, "heap") == 0) { 1020 verify_flags |= Verify_Heap; 1021 } else if (strcmp(token, "symbol_table") == 0) { 1022 verify_flags |= Verify_SymbolTable; 1023 } else if (strcmp(token, "string_table") == 0) { 1024 verify_flags |= Verify_StringTable; 1025 } else if (strcmp(token, "codecache") == 0) { 1026 verify_flags |= Verify_CodeCache; 1027 } else if (strcmp(token, "dictionary") == 0) { 1028 verify_flags |= Verify_SystemDictionary; 1029 } else if (strcmp(token, "classloader_data_graph") == 0) { 1030 verify_flags |= Verify_ClassLoaderDataGraph; 1031 } else if (strcmp(token, "metaspace") == 0) { 1032 verify_flags |= Verify_MetaspaceUtils; 1033 } else if (strcmp(token, "jni_handles") == 0) { 1034 verify_flags |= Verify_JNIHandles; 1035 } else if (strcmp(token, "codecache_oops") == 0) { 1036 verify_flags |= Verify_CodeCacheOops; 1037 } else if (strcmp(token, "resolved_method_table") == 0) { 1038 verify_flags |= Verify_ResolvedMethodTable; 1039 } else { 1040 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1041 } 1042 token = strtok_r(NULL, delimiter, &save_ptr); 1043 } 1044 FREE_C_HEAP_ARRAY(char, subset_list); 1045 } 1046 1047 bool Universe::should_verify_subset(uint subset) { 1048 if (verify_flags & subset) { 1049 return true; 1050 } 1051 return false; 1052 } 1053 1054 void Universe::verify(VerifyOption option, const char* prefix) { 1055 // The use of _verify_in_progress is a temporary work around for 1056 // 6320749. Don't bother with a creating a class to set and clear 1057 // it since it is only used in this method and the control flow is 1058 // straight forward. 1059 _verify_in_progress = true; 1060 1061 COMPILER2_PRESENT( 1062 assert(!DerivedPointerTable::is_active(), 1063 "DPT should not be active during verification " 1064 "(of thread stacks below)"); 1065 ) 1066 1067 ResourceMark rm; 1068 HandleMark hm; // Handles created during verification can be zapped 1069 _verify_count++; 1070 1071 FormatBuffer<> title("Verifying %s", prefix); 1072 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1073 if (should_verify_subset(Verify_Threads)) { 1074 log_debug(gc, verify)("Threads"); 1075 Threads::verify(); 1076 } 1077 if (should_verify_subset(Verify_Heap)) { 1078 log_debug(gc, verify)("Heap"); 1079 heap()->verify(option); 1080 } 1081 if (should_verify_subset(Verify_SymbolTable)) { 1082 log_debug(gc, verify)("SymbolTable"); 1083 SymbolTable::verify(); 1084 } 1085 if (should_verify_subset(Verify_StringTable)) { 1086 log_debug(gc, verify)("StringTable"); 1087 StringTable::verify(); 1088 } 1089 if (should_verify_subset(Verify_CodeCache)) { 1090 { 1091 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1092 log_debug(gc, verify)("CodeCache"); 1093 CodeCache::verify(); 1094 } 1095 } 1096 if (should_verify_subset(Verify_SystemDictionary)) { 1097 log_debug(gc, verify)("SystemDictionary"); 1098 SystemDictionary::verify(); 1099 } 1100 #ifndef PRODUCT 1101 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1102 log_debug(gc, verify)("ClassLoaderDataGraph"); 1103 ClassLoaderDataGraph::verify(); 1104 } 1105 #endif 1106 if (should_verify_subset(Verify_MetaspaceUtils)) { 1107 log_debug(gc, verify)("MetaspaceUtils"); 1108 MetaspaceUtils::verify_free_chunks(); 1109 } 1110 if (should_verify_subset(Verify_JNIHandles)) { 1111 log_debug(gc, verify)("JNIHandles"); 1112 JNIHandles::verify(); 1113 } 1114 if (should_verify_subset(Verify_CodeCacheOops)) { 1115 log_debug(gc, verify)("CodeCache Oops"); 1116 CodeCache::verify_oops(); 1117 } 1118 if (should_verify_subset(Verify_ResolvedMethodTable)) { 1119 log_debug(gc, verify)("ResolvedMethodTable Oops"); 1120 ResolvedMethodTable::verify(); 1121 } 1122 1123 _verify_in_progress = false; 1124 } 1125 1126 1127 #ifndef PRODUCT 1128 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1129 assert(low_boundary < high_boundary, "bad interval"); 1130 1131 // decide which low-order bits we require to be clear: 1132 size_t alignSize = MinObjAlignmentInBytes; 1133 size_t min_object_size = CollectedHeap::min_fill_size(); 1134 1135 // make an inclusive limit: 1136 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1137 uintptr_t min = (uintptr_t)low_boundary; 1138 assert(min < max, "bad interval"); 1139 uintptr_t diff = max ^ min; 1140 1141 // throw away enough low-order bits to make the diff vanish 1142 uintptr_t mask = (uintptr_t)(-1); 1143 while ((mask & diff) != 0) 1144 mask <<= 1; 1145 uintptr_t bits = (min & mask); 1146 assert(bits == (max & mask), "correct mask"); 1147 // check an intermediate value between min and max, just to make sure: 1148 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1149 1150 // require address alignment, too: 1151 mask |= (alignSize - 1); 1152 1153 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1154 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1155 } 1156 _verify_oop_mask = mask; 1157 _verify_oop_bits = bits; 1158 } 1159 1160 // Oop verification (see MacroAssembler::verify_oop) 1161 1162 uintptr_t Universe::verify_oop_mask() { 1163 return _verify_oop_mask; 1164 } 1165 1166 uintptr_t Universe::verify_oop_bits() { 1167 return _verify_oop_bits; 1168 } 1169 1170 uintptr_t Universe::verify_mark_mask() { 1171 return markWord::lock_mask_in_place; 1172 } 1173 1174 uintptr_t Universe::verify_mark_bits() { 1175 intptr_t mask = verify_mark_mask(); 1176 intptr_t bits = (intptr_t)markWord::prototype().value(); 1177 assert((bits & ~mask) == 0, "no stray header bits"); 1178 return bits; 1179 } 1180 #endif // PRODUCT 1181 1182 1183 void LatestMethodCache::init(Klass* k, Method* m) { 1184 if (!UseSharedSpaces) { 1185 _klass = k; 1186 } 1187 #ifndef PRODUCT 1188 else { 1189 // sharing initilization should have already set up _klass 1190 assert(_klass != NULL, "just checking"); 1191 } 1192 #endif 1193 1194 _method_idnum = m->method_idnum(); 1195 assert(_method_idnum >= 0, "sanity check"); 1196 } 1197 1198 1199 Method* LatestMethodCache::get_method() { 1200 if (klass() == NULL) return NULL; 1201 InstanceKlass* ik = InstanceKlass::cast(klass()); 1202 Method* m = ik->method_with_idnum(method_idnum()); 1203 assert(m != NULL, "sanity check"); 1204 return m; 1205 } 1206 1207 1208 #ifdef ASSERT 1209 // Release dummy object(s) at bottom of heap 1210 bool Universe::release_fullgc_alot_dummy() { 1211 MutexLocker ml(FullGCALot_lock); 1212 if (_fullgc_alot_dummy_array != NULL) { 1213 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1214 // No more dummies to release, release entire array instead 1215 _fullgc_alot_dummy_array = NULL; 1216 return false; 1217 } 1218 1219 // Release dummy at bottom of old generation 1220 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1221 1222 // Release dummy at bottom of permanent generation 1223 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1224 } 1225 return true; 1226 } 1227 1228 #endif // ASSERT