1 /* 2 * Copyright (c) 1997, 2019, 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 // Known objects 89 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ }; 90 Klass* Universe::_objectArrayKlassObj = NULL; 91 oop Universe::_int_mirror = NULL; 92 oop Universe::_float_mirror = NULL; 93 oop Universe::_double_mirror = NULL; 94 oop Universe::_byte_mirror = NULL; 95 oop Universe::_bool_mirror = NULL; 96 oop Universe::_char_mirror = NULL; 97 oop Universe::_long_mirror = NULL; 98 oop Universe::_short_mirror = NULL; 99 oop Universe::_void_mirror = NULL; 100 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 101 oop Universe::_main_thread_group = NULL; 102 oop Universe::_system_thread_group = NULL; 103 objArrayOop Universe::_the_empty_class_klass_array = NULL; 104 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 105 oop Universe::_the_null_sentinel = NULL; 106 oop Universe::_the_null_string = NULL; 107 oop Universe::_the_min_jint_string = NULL; 108 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 109 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 110 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 111 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL; 112 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 113 oop Universe::_out_of_memory_error_java_heap = NULL; 114 oop Universe::_out_of_memory_error_metaspace = NULL; 115 oop Universe::_out_of_memory_error_class_metaspace = NULL; 116 oop Universe::_out_of_memory_error_array_size = NULL; 117 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 118 oop Universe::_out_of_memory_error_realloc_objects = NULL; 119 oop Universe::_out_of_memory_error_retry = NULL; 120 oop Universe::_delayed_stack_overflow_error_message = NULL; 121 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 122 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 123 bool Universe::_verify_in_progress = false; 124 long Universe::verify_flags = Universe::Verify_All; 125 oop Universe::_null_ptr_exception_instance = NULL; 126 oop Universe::_arithmetic_exception_instance = NULL; 127 oop Universe::_virtual_machine_error_instance = NULL; 128 oop Universe::_vm_exception = NULL; 129 oop Universe::_reference_pending_list = NULL; 130 131 Array<int>* Universe::_the_empty_int_array = NULL; 132 Array<u2>* Universe::_the_empty_short_array = NULL; 133 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 134 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL; 135 Array<Method*>* Universe::_the_empty_method_array = NULL; 136 137 // These variables are guarded by FullGCALot_lock. 138 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 139 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 140 141 // Heap 142 int Universe::_verify_count = 0; 143 144 // Oop verification (see MacroAssembler::verify_oop) 145 uintptr_t Universe::_verify_oop_mask = 0; 146 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 147 148 int Universe::_base_vtable_size = 0; 149 bool Universe::_bootstrapping = false; 150 bool Universe::_module_initialized = false; 151 bool Universe::_fully_initialized = false; 152 153 size_t Universe::_heap_capacity_at_last_gc; 154 size_t Universe::_heap_used_at_last_gc = 0; 155 156 CollectedHeap* Universe::_collectedHeap = NULL; 157 158 void Universe::basic_type_classes_do(void f(Klass*)) { 159 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 160 f(_typeArrayKlassObjs[i]); 161 } 162 } 163 164 void Universe::basic_type_classes_do(KlassClosure *closure) { 165 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 166 closure->do_klass(_typeArrayKlassObjs[i]); 167 } 168 } 169 170 void Universe::oops_do(OopClosure* f) { 171 172 f->do_oop((oop*) &_int_mirror); 173 f->do_oop((oop*) &_float_mirror); 174 f->do_oop((oop*) &_double_mirror); 175 f->do_oop((oop*) &_byte_mirror); 176 f->do_oop((oop*) &_bool_mirror); 177 f->do_oop((oop*) &_char_mirror); 178 f->do_oop((oop*) &_long_mirror); 179 f->do_oop((oop*) &_short_mirror); 180 f->do_oop((oop*) &_void_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 } 209 210 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 211 it->push(&_klass); 212 } 213 214 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 215 for (int i = 0; i < T_LONG+1; i++) { 216 it->push(&_typeArrayKlassObjs[i]); 217 } 218 it->push(&_objectArrayKlassObj); 219 220 it->push(&_the_empty_int_array); 221 it->push(&_the_empty_short_array); 222 it->push(&_the_empty_klass_array); 223 it->push(&_the_empty_instance_klass_array); 224 it->push(&_the_empty_method_array); 225 it->push(&_the_array_interfaces_array); 226 227 _finalizer_register_cache->metaspace_pointers_do(it); 228 _loader_addClass_cache->metaspace_pointers_do(it); 229 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 230 _throw_no_such_method_error_cache->metaspace_pointers_do(it); 231 _do_stack_walk_cache->metaspace_pointers_do(it); 232 } 233 234 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive 235 void Universe::serialize(SerializeClosure* f) { 236 237 for (int i = 0; i < T_LONG+1; i++) { 238 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 239 } 240 241 f->do_ptr((void**)&_objectArrayKlassObj); 242 #if INCLUDE_CDS_JAVA_HEAP 243 #ifdef ASSERT 244 if (DumpSharedSpaces && !HeapShared::is_heap_object_archiving_allowed()) { 245 assert(_int_mirror == NULL && _float_mirror == NULL && 246 _double_mirror == NULL && _byte_mirror == NULL && 247 _bool_mirror == NULL && _char_mirror == NULL && 248 _long_mirror == NULL && _short_mirror == NULL && 249 _void_mirror == NULL, "mirrors should be NULL"); 250 } 251 #endif 252 f->do_mirror_oop(&_int_mirror); 253 f->do_mirror_oop(&_float_mirror); 254 f->do_mirror_oop(&_double_mirror); 255 f->do_mirror_oop(&_byte_mirror); 256 f->do_mirror_oop(&_bool_mirror); 257 f->do_mirror_oop(&_char_mirror); 258 f->do_mirror_oop(&_long_mirror); 259 f->do_mirror_oop(&_short_mirror); 260 f->do_mirror_oop(&_void_mirror); 261 #endif 262 263 f->do_ptr((void**)&_the_array_interfaces_array); 264 f->do_ptr((void**)&_the_empty_int_array); 265 f->do_ptr((void**)&_the_empty_short_array); 266 f->do_ptr((void**)&_the_empty_method_array); 267 f->do_ptr((void**)&_the_empty_klass_array); 268 f->do_ptr((void**)&_the_empty_instance_klass_array); 269 _finalizer_register_cache->serialize(f); 270 _loader_addClass_cache->serialize(f); 271 _throw_illegal_access_error_cache->serialize(f); 272 _throw_no_such_method_error_cache->serialize(f); 273 _do_stack_walk_cache->serialize(f); 274 } 275 276 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 277 if (size < alignment || size % alignment != 0) { 278 vm_exit_during_initialization( 279 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 280 } 281 } 282 283 void initialize_basic_type_klass(Klass* k, TRAPS) { 284 Klass* ok = SystemDictionary::Object_klass(); 285 #if INCLUDE_CDS 286 if (UseSharedSpaces) { 287 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 288 assert(k->super() == ok, "u3"); 289 k->restore_unshareable_info(loader_data, Handle(), CHECK); 290 } else 291 #endif 292 { 293 k->initialize_supers(ok, NULL, CHECK); 294 } 295 k->append_to_sibling_list(); 296 } 297 298 void Universe::genesis(TRAPS) { 299 ResourceMark rm; 300 301 { FlagSetting fs(_bootstrapping, true); 302 303 { MutexLocker mc(Compile_lock); 304 305 java_lang_Class::allocate_fixup_lists(); 306 307 // determine base vtable size; without that we cannot create the array klasses 308 compute_base_vtable_size(); 309 310 if (!UseSharedSpaces) { 311 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 312 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 313 } 314 315 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 316 317 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 318 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 319 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 320 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 321 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 322 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 323 } 324 } 325 326 vmSymbols::initialize(CHECK); 327 328 SystemDictionary::initialize(CHECK); 329 330 Klass* ok = SystemDictionary::Object_klass(); 331 332 _the_null_string = StringTable::intern("null", CHECK); 333 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 334 335 #if INCLUDE_CDS 336 if (UseSharedSpaces) { 337 // Verify shared interfaces array. 338 assert(_the_array_interfaces_array->at(0) == 339 SystemDictionary::Cloneable_klass(), "u3"); 340 assert(_the_array_interfaces_array->at(1) == 341 SystemDictionary::Serializable_klass(), "u3"); 342 } else 343 #endif 344 { 345 // Set up shared interfaces array. (Do this before supers are set up.) 346 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 347 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 348 } 349 350 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 351 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 352 initialize_basic_type_klass(floatArrayKlassObj(), CHECK); 353 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 354 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 355 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 356 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 357 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 358 } // end of core bootstrapping 359 360 { 361 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 362 _the_null_sentinel = tns(); 363 } 364 365 // Maybe this could be lifted up now that object array can be initialized 366 // during the bootstrapping. 367 368 // OLD 369 // Initialize _objectArrayKlass after core bootstraping to make 370 // sure the super class is set up properly for _objectArrayKlass. 371 // --- 372 // NEW 373 // Since some of the old system object arrays have been converted to 374 // ordinary object arrays, _objectArrayKlass will be loaded when 375 // SystemDictionary::initialize(CHECK); is run. See the extra check 376 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 377 _objectArrayKlassObj = InstanceKlass:: 378 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 379 // OLD 380 // Add the class to the class hierarchy manually to make sure that 381 // its vtable is initialized after core bootstrapping is completed. 382 // --- 383 // New 384 // Have already been initialized. 385 _objectArrayKlassObj->append_to_sibling_list(); 386 387 #ifdef ASSERT 388 if (FullGCALot) { 389 // Allocate an array of dummy objects. 390 // We'd like these to be at the bottom of the old generation, 391 // so that when we free one and then collect, 392 // (almost) the whole heap moves 393 // and we find out if we actually update all the oops correctly. 394 // But we can't allocate directly in the old generation, 395 // so we allocate wherever, and hope that the first collection 396 // moves these objects to the bottom of the old generation. 397 // We can allocate directly in the permanent generation, so we do. 398 int size; 399 if (UseConcMarkSweepGC) { 400 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate"); 401 size = FullGCALotDummies; 402 } else { 403 size = FullGCALotDummies * 2; 404 } 405 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 406 objArrayHandle dummy_array(THREAD, naked_array); 407 int i = 0; 408 while (i < size) { 409 // Allocate dummy in old generation 410 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 411 dummy_array->obj_at_put(i++, dummy); 412 } 413 { 414 // Only modify the global variable inside the mutex. 415 // If we had a race to here, the other dummy_array instances 416 // and their elements just get dropped on the floor, which is fine. 417 MutexLocker ml(FullGCALot_lock); 418 if (_fullgc_alot_dummy_array == NULL) { 419 _fullgc_alot_dummy_array = dummy_array(); 420 } 421 } 422 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 423 } 424 #endif 425 } 426 427 void Universe::initialize_basic_type_mirrors(TRAPS) { 428 #if INCLUDE_CDS_JAVA_HEAP 429 if (UseSharedSpaces && 430 HeapShared::open_archive_heap_region_mapped() && 431 _int_mirror != NULL) { 432 assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity"); 433 assert(_float_mirror != NULL && _double_mirror != NULL && 434 _byte_mirror != NULL && _byte_mirror != NULL && 435 _bool_mirror != NULL && _char_mirror != NULL && 436 _long_mirror != NULL && _short_mirror != NULL && 437 _void_mirror != NULL, "Sanity"); 438 } else 439 #endif 440 { 441 _int_mirror = 442 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 443 _float_mirror = 444 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 445 _double_mirror = 446 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 447 _byte_mirror = 448 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 449 _bool_mirror = 450 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 451 _char_mirror = 452 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 453 _long_mirror = 454 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 455 _short_mirror = 456 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 457 _void_mirror = 458 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 459 } 460 461 _mirrors[T_INT] = _int_mirror; 462 _mirrors[T_FLOAT] = _float_mirror; 463 _mirrors[T_DOUBLE] = _double_mirror; 464 _mirrors[T_BYTE] = _byte_mirror; 465 _mirrors[T_BOOLEAN] = _bool_mirror; 466 _mirrors[T_CHAR] = _char_mirror; 467 _mirrors[T_LONG] = _long_mirror; 468 _mirrors[T_SHORT] = _short_mirror; 469 _mirrors[T_VOID] = _void_mirror; 470 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 471 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 472 } 473 474 void Universe::fixup_mirrors(TRAPS) { 475 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 476 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 477 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 478 // that the number of objects allocated at this point is very small. 479 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 480 HandleMark hm(THREAD); 481 482 if (!UseSharedSpaces) { 483 // Cache the start of the static fields 484 InstanceMirrorKlass::init_offset_of_static_fields(); 485 } 486 487 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 488 int list_length = list->length(); 489 for (int i = 0; i < list_length; i++) { 490 Klass* k = list->at(i); 491 assert(k->is_klass(), "List should only hold classes"); 492 EXCEPTION_MARK; 493 java_lang_Class::fixup_mirror(k, CATCH); 494 } 495 delete java_lang_Class::fixup_mirror_list(); 496 java_lang_Class::set_fixup_mirror_list(NULL); 497 } 498 499 #define assert_pll_locked(test) \ 500 assert(Heap_lock->test(), "Reference pending list access requires lock") 501 502 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 503 504 oop Universe::reference_pending_list() { 505 if (Thread::current()->is_VM_thread()) { 506 assert_pll_locked(is_locked); 507 } else { 508 assert_pll_ownership(); 509 } 510 return _reference_pending_list; 511 } 512 513 void Universe::set_reference_pending_list(oop list) { 514 assert_pll_ownership(); 515 _reference_pending_list = list; 516 } 517 518 bool Universe::has_reference_pending_list() { 519 assert_pll_ownership(); 520 return _reference_pending_list != NULL; 521 } 522 523 oop Universe::swap_reference_pending_list(oop list) { 524 assert_pll_locked(is_locked); 525 return Atomic::xchg(list, &_reference_pending_list); 526 } 527 528 #undef assert_pll_locked 529 #undef assert_pll_ownership 530 531 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) { 532 // init vtable of k and all subclasses 533 ko->vtable().initialize_vtable(false, CHECK); 534 if (ko->is_instance_klass()) { 535 for (Klass* sk = ko->subklass(); 536 sk != NULL; 537 sk = sk->next_sibling()) { 538 reinitialize_vtable_of(sk, CHECK); 539 } 540 } 541 } 542 543 void Universe::reinitialize_vtables(TRAPS) { 544 // The vtables are initialized by starting at java.lang.Object and 545 // initializing through the subclass links, so that the super 546 // classes are always initialized first. 547 Klass* ok = SystemDictionary::Object_klass(); 548 Universe::reinitialize_vtable_of(ok, THREAD); 549 } 550 551 552 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) { 553 k->itable().initialize_itable(false, CHECK); 554 } 555 556 557 void Universe::reinitialize_itables(TRAPS) { 558 MutexLocker mcld(ClassLoaderDataGraph_lock); 559 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK); 560 } 561 562 563 bool Universe::on_page_boundary(void* addr) { 564 return is_aligned(addr, os::vm_page_size()); 565 } 566 567 568 bool Universe::should_fill_in_stack_trace(Handle throwable) { 569 // never attempt to fill in the stack trace of preallocated errors that do not have 570 // backtrace. These errors are kept alive forever and may be "re-used" when all 571 // preallocated errors with backtrace have been consumed. Also need to avoid 572 // a potential loop which could happen if an out of memory occurs when attempting 573 // to allocate the backtrace. 574 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 575 (throwable() != Universe::_out_of_memory_error_metaspace) && 576 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 577 (throwable() != Universe::_out_of_memory_error_array_size) && 578 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) && 579 (throwable() != Universe::_out_of_memory_error_realloc_objects) && 580 (throwable() != Universe::_out_of_memory_error_retry)); 581 } 582 583 584 oop Universe::gen_out_of_memory_error(oop default_err) { 585 // generate an out of memory error: 586 // - if there is a preallocated error and stack traces are available 587 // (j.l.Throwable is initialized), then return the preallocated 588 // error with a filled in stack trace, and with the message 589 // provided by the default error. 590 // - otherwise, return the default error, without a stack trace. 591 int next; 592 if ((_preallocated_out_of_memory_error_avail_count > 0) && 593 SystemDictionary::Throwable_klass()->is_initialized()) { 594 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 595 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 596 } else { 597 next = -1; 598 } 599 if (next < 0) { 600 // all preallocated errors have been used. 601 // return default 602 return default_err; 603 } else { 604 Thread* THREAD = Thread::current(); 605 Handle default_err_h(THREAD, default_err); 606 // get the error object at the slot and set set it to NULL so that the 607 // array isn't keeping it alive anymore. 608 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next)); 609 assert(exc() != NULL, "slot has been used already"); 610 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 611 612 // use the message from the default error 613 oop msg = java_lang_Throwable::message(default_err_h()); 614 assert(msg != NULL, "no message"); 615 java_lang_Throwable::set_message(exc(), msg); 616 617 // populate the stack trace and return it. 618 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 619 return exc(); 620 } 621 } 622 623 intptr_t Universe::_non_oop_bits = 0; 624 625 void* Universe::non_oop_word() { 626 // Neither the high bits nor the low bits of this value is allowed 627 // to look like (respectively) the high or low bits of a real oop. 628 // 629 // High and low are CPU-specific notions, but low always includes 630 // the low-order bit. Since oops are always aligned at least mod 4, 631 // setting the low-order bit will ensure that the low half of the 632 // word will never look like that of a real oop. 633 // 634 // Using the OS-supplied non-memory-address word (usually 0 or -1) 635 // will take care of the high bits, however many there are. 636 637 if (_non_oop_bits == 0) { 638 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 639 } 640 641 return (void*)_non_oop_bits; 642 } 643 644 static void initialize_global_behaviours() { 645 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour()); 646 } 647 648 jint universe_init() { 649 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 650 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 651 "LogHeapWordSize is incorrect."); 652 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 653 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 654 "oop size is not not a multiple of HeapWord size"); 655 656 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 657 658 JavaClasses::compute_hard_coded_offsets(); 659 660 initialize_global_behaviours(); 661 662 GCConfig::arguments()->initialize_heap_sizes(); 663 664 jint status = Universe::initialize_heap(); 665 if (status != JNI_OK) { 666 return status; 667 } 668 669 Universe::initialize_tlab(); 670 671 Metaspace::global_initialize(); 672 673 // Initialize performance counters for metaspaces 674 MetaspaceCounters::initialize_performance_counters(); 675 CompressedClassSpaceCounters::initialize_performance_counters(); 676 677 AOTLoader::universe_init(); 678 679 // Checks 'AfterMemoryInit' constraints. 680 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) { 681 return JNI_EINVAL; 682 } 683 684 // Create memory for metadata. Must be after initializing heap for 685 // DumpSharedSpaces. 686 ClassLoaderData::init_null_class_loader_data(); 687 688 // We have a heap so create the Method* caches before 689 // Metaspace::initialize_shared_spaces() tries to populate them. 690 Universe::_finalizer_register_cache = new LatestMethodCache(); 691 Universe::_loader_addClass_cache = new LatestMethodCache(); 692 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 693 Universe::_throw_no_such_method_error_cache = new LatestMethodCache(); 694 Universe::_do_stack_walk_cache = new LatestMethodCache(); 695 696 #if INCLUDE_CDS 697 if (UseSharedSpaces) { 698 // Read the data structures supporting the shared spaces (shared 699 // system dictionary, symbol table, etc.). After that, access to 700 // the file (other than the mapped regions) is no longer needed, and 701 // the file is closed. Closing the file does not affect the 702 // currently mapped regions. 703 MetaspaceShared::initialize_shared_spaces(); 704 StringTable::create_table(); 705 } else 706 #endif 707 { 708 SymbolTable::create_table(); 709 StringTable::create_table(); 710 } 711 712 #if INCLUDE_CDS 713 if (Arguments::is_dumping_archive()) { 714 MetaspaceShared::prepare_for_dumping(); 715 } 716 #endif 717 718 if (strlen(VerifySubSet) > 0) { 719 Universe::initialize_verify_flags(); 720 } 721 722 ResolvedMethodTable::create_table(); 723 724 return JNI_OK; 725 } 726 727 jint Universe::initialize_heap() { 728 assert(_collectedHeap == NULL, "Heap already created"); 729 _collectedHeap = GCConfig::arguments()->create_heap(); 730 jint status = _collectedHeap->initialize(); 731 732 if (status == JNI_OK) { 733 log_info(gc)("Using %s", _collectedHeap->name()); 734 } 735 736 return status; 737 } 738 739 void Universe::initialize_tlab() { 740 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 741 if (UseTLAB) { 742 assert(Universe::heap()->supports_tlab_allocation(), 743 "Should support thread-local allocation buffers"); 744 ThreadLocalAllocBuffer::startup_initialization(); 745 } 746 } 747 748 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 749 750 assert(alignment <= Arguments::conservative_max_heap_alignment(), 751 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 752 alignment, Arguments::conservative_max_heap_alignment()); 753 754 size_t total_reserved = align_up(heap_size, alignment); 755 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 756 "heap size is too big for compressed oops"); 757 758 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size()); 759 assert(!UseLargePages 760 || UseParallelGC 761 || use_large_pages, "Wrong alignment to use large pages"); 762 763 // Now create the space. 764 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt); 765 766 if (total_rs.is_reserved()) { 767 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 768 "must be exactly of required size and alignment"); 769 // We are good. 770 771 if (AllocateHeapAt != NULL) { 772 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 773 } 774 775 if (UseCompressedOops) { 776 CompressedOops::initialize(total_rs); 777 } 778 779 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end()); 780 781 return total_rs; 782 } 783 784 vm_exit_during_initialization( 785 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 786 total_reserved/K)); 787 788 // satisfy compiler 789 ShouldNotReachHere(); 790 return ReservedHeapSpace(0, 0, false); 791 } 792 793 794 // It's the caller's responsibility to ensure glitch-freedom 795 // (if required). 796 void Universe::update_heap_info_at_gc() { 797 _heap_capacity_at_last_gc = heap()->capacity(); 798 _heap_used_at_last_gc = heap()->used(); 799 } 800 801 void initialize_known_method(LatestMethodCache* method_cache, 802 InstanceKlass* ik, 803 const char* method, 804 Symbol* signature, 805 bool is_static, TRAPS) 806 { 807 TempNewSymbol name = SymbolTable::new_symbol(method); 808 Method* m = NULL; 809 // The klass must be linked before looking up the method. 810 if (!ik->link_class_or_fail(THREAD) || 811 ((m = ik->find_method(name, signature)) == NULL) || 812 is_static != m->is_static()) { 813 ResourceMark rm(THREAD); 814 // NoSuchMethodException doesn't actually work because it tries to run the 815 // <init> function before java_lang_Class is linked. Print error and exit. 816 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 817 ik->name()->as_C_string(), method)); 818 } 819 method_cache->init(ik, m); 820 } 821 822 void Universe::initialize_known_methods(TRAPS) { 823 // Set up static method for registering finalizers 824 initialize_known_method(_finalizer_register_cache, 825 SystemDictionary::Finalizer_klass(), 826 "register", 827 vmSymbols::object_void_signature(), true, CHECK); 828 829 initialize_known_method(_throw_illegal_access_error_cache, 830 SystemDictionary::internal_Unsafe_klass(), 831 "throwIllegalAccessError", 832 vmSymbols::void_method_signature(), true, CHECK); 833 834 initialize_known_method(_throw_no_such_method_error_cache, 835 SystemDictionary::internal_Unsafe_klass(), 836 "throwNoSuchMethodError", 837 vmSymbols::void_method_signature(), true, CHECK); 838 839 // Set up method for registering loaded classes in class loader vector 840 initialize_known_method(_loader_addClass_cache, 841 SystemDictionary::ClassLoader_klass(), 842 "addClass", 843 vmSymbols::class_void_signature(), false, CHECK); 844 845 // Set up method for stack walking 846 initialize_known_method(_do_stack_walk_cache, 847 SystemDictionary::AbstractStackWalker_klass(), 848 "doStackWalk", 849 vmSymbols::doStackWalk_signature(), false, CHECK); 850 } 851 852 void universe2_init() { 853 EXCEPTION_MARK; 854 Universe::genesis(CATCH); 855 } 856 857 // Set after initialization of the module runtime, call_initModuleRuntime 858 void universe_post_module_init() { 859 Universe::_module_initialized = true; 860 } 861 862 bool universe_post_init() { 863 assert(!is_init_completed(), "Error: initialization not yet completed!"); 864 Universe::_fully_initialized = true; 865 EXCEPTION_MARK; 866 { ResourceMark rm; 867 Interpreter::initialize(); // needed for interpreter entry points 868 if (!UseSharedSpaces) { 869 Universe::reinitialize_vtables(CHECK_false); 870 Universe::reinitialize_itables(CHECK_false); 871 } 872 } 873 874 HandleMark hm(THREAD); 875 // Setup preallocated empty java.lang.Class array 876 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 877 878 // Setup preallocated OutOfMemoryError errors 879 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 880 InstanceKlass* ik = InstanceKlass::cast(k); 881 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false); 882 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false); 883 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false); 884 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false); 885 Universe::_out_of_memory_error_gc_overhead_limit = 886 ik->allocate_instance(CHECK_false); 887 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false); 888 Universe::_out_of_memory_error_retry = ik->allocate_instance(CHECK_false); 889 890 // Setup preallocated cause message for delayed StackOverflowError 891 if (StackReservedPages > 0) { 892 Universe::_delayed_stack_overflow_error_message = 893 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 894 } 895 896 // Setup preallocated NullPointerException 897 // (this is currently used for a cheap & dirty solution in compiler exception handling) 898 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 899 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 900 // Setup preallocated ArithmeticException 901 // (this is currently used for a cheap & dirty solution in compiler exception handling) 902 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 903 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 904 // Virtual Machine Error for when we get into a situation we can't resolve 905 k = SystemDictionary::resolve_or_fail( 906 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 907 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 908 if (!linked) { 909 tty->print_cr("Unable to link/verify VirtualMachineError class"); 910 return false; // initialization failed 911 } 912 Universe::_virtual_machine_error_instance = 913 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 914 915 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 916 917 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 918 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 919 920 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 921 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 922 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 923 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 924 925 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 926 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 927 928 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 929 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 930 931 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 932 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 933 934 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK_false); 935 java_lang_Throwable::set_message(Universe::_out_of_memory_error_retry, msg()); 936 937 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 938 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 939 940 // Setup the array of errors that have preallocated backtrace 941 k = Universe::_out_of_memory_error_java_heap->klass(); 942 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 943 ik = InstanceKlass::cast(k); 944 945 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 946 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false); 947 for (int i=0; i<len; i++) { 948 oop err = ik->allocate_instance(CHECK_false); 949 Handle err_h = Handle(THREAD, err); 950 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 951 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 952 } 953 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 954 955 Universe::initialize_known_methods(CHECK_false); 956 957 // This needs to be done before the first scavenge/gc, since 958 // it's an input to soft ref clearing policy. 959 { 960 MutexLocker x(Heap_lock); 961 Universe::update_heap_info_at_gc(); 962 } 963 964 // ("weak") refs processing infrastructure initialization 965 Universe::heap()->post_initialize(); 966 967 MemoryService::add_metaspace_memory_pools(); 968 969 MemoryService::set_universe_heap(Universe::heap()); 970 #if INCLUDE_CDS 971 MetaspaceShared::post_initialize(CHECK_false); 972 #endif 973 return true; 974 } 975 976 977 void Universe::compute_base_vtable_size() { 978 _base_vtable_size = ClassLoader::compute_Object_vtable(); 979 } 980 981 void Universe::print_on(outputStream* st) { 982 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 983 st->print_cr("Heap"); 984 heap()->print_on(st); 985 } 986 987 void Universe::print_heap_at_SIGBREAK() { 988 if (PrintHeapAtSIGBREAK) { 989 print_on(tty); 990 tty->cr(); 991 tty->flush(); 992 } 993 } 994 995 void Universe::print_heap_before_gc() { 996 LogTarget(Debug, gc, heap) lt; 997 if (lt.is_enabled()) { 998 LogStream ls(lt); 999 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1000 ResourceMark rm; 1001 heap()->print_on(&ls); 1002 } 1003 } 1004 1005 void Universe::print_heap_after_gc() { 1006 LogTarget(Debug, gc, heap) lt; 1007 if (lt.is_enabled()) { 1008 LogStream ls(lt); 1009 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1010 ResourceMark rm; 1011 heap()->print_on(&ls); 1012 } 1013 } 1014 1015 void Universe::initialize_verify_flags() { 1016 verify_flags = 0; 1017 const char delimiter[] = " ,"; 1018 1019 size_t length = strlen(VerifySubSet); 1020 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1021 strncpy(subset_list, VerifySubSet, length + 1); 1022 char* save_ptr; 1023 1024 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1025 while (token != NULL) { 1026 if (strcmp(token, "threads") == 0) { 1027 verify_flags |= Verify_Threads; 1028 } else if (strcmp(token, "heap") == 0) { 1029 verify_flags |= Verify_Heap; 1030 } else if (strcmp(token, "symbol_table") == 0) { 1031 verify_flags |= Verify_SymbolTable; 1032 } else if (strcmp(token, "string_table") == 0) { 1033 verify_flags |= Verify_StringTable; 1034 } else if (strcmp(token, "codecache") == 0) { 1035 verify_flags |= Verify_CodeCache; 1036 } else if (strcmp(token, "dictionary") == 0) { 1037 verify_flags |= Verify_SystemDictionary; 1038 } else if (strcmp(token, "classloader_data_graph") == 0) { 1039 verify_flags |= Verify_ClassLoaderDataGraph; 1040 } else if (strcmp(token, "metaspace") == 0) { 1041 verify_flags |= Verify_MetaspaceUtils; 1042 } else if (strcmp(token, "jni_handles") == 0) { 1043 verify_flags |= Verify_JNIHandles; 1044 } else if (strcmp(token, "codecache_oops") == 0) { 1045 verify_flags |= Verify_CodeCacheOops; 1046 } else if (strcmp(token, "resolved_method_table") == 0) { 1047 verify_flags |= Verify_ResolvedMethodTable; 1048 } else { 1049 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1050 } 1051 token = strtok_r(NULL, delimiter, &save_ptr); 1052 } 1053 FREE_C_HEAP_ARRAY(char, subset_list); 1054 } 1055 1056 bool Universe::should_verify_subset(uint subset) { 1057 if (verify_flags & subset) { 1058 return true; 1059 } 1060 return false; 1061 } 1062 1063 void Universe::verify(VerifyOption option, const char* prefix) { 1064 // The use of _verify_in_progress is a temporary work around for 1065 // 6320749. Don't bother with a creating a class to set and clear 1066 // it since it is only used in this method and the control flow is 1067 // straight forward. 1068 _verify_in_progress = true; 1069 1070 COMPILER2_PRESENT( 1071 assert(!DerivedPointerTable::is_active(), 1072 "DPT should not be active during verification " 1073 "(of thread stacks below)"); 1074 ) 1075 1076 ResourceMark rm; 1077 HandleMark hm; // Handles created during verification can be zapped 1078 _verify_count++; 1079 1080 FormatBuffer<> title("Verifying %s", prefix); 1081 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1082 if (should_verify_subset(Verify_Threads)) { 1083 log_debug(gc, verify)("Threads"); 1084 Threads::verify(); 1085 } 1086 if (should_verify_subset(Verify_Heap)) { 1087 log_debug(gc, verify)("Heap"); 1088 heap()->verify(option); 1089 } 1090 if (should_verify_subset(Verify_SymbolTable)) { 1091 log_debug(gc, verify)("SymbolTable"); 1092 SymbolTable::verify(); 1093 } 1094 if (should_verify_subset(Verify_StringTable)) { 1095 log_debug(gc, verify)("StringTable"); 1096 StringTable::verify(); 1097 } 1098 if (should_verify_subset(Verify_CodeCache)) { 1099 { 1100 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1101 log_debug(gc, verify)("CodeCache"); 1102 CodeCache::verify(); 1103 } 1104 } 1105 if (should_verify_subset(Verify_SystemDictionary)) { 1106 log_debug(gc, verify)("SystemDictionary"); 1107 SystemDictionary::verify(); 1108 } 1109 #ifndef PRODUCT 1110 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1111 log_debug(gc, verify)("ClassLoaderDataGraph"); 1112 ClassLoaderDataGraph::verify(); 1113 } 1114 #endif 1115 if (should_verify_subset(Verify_MetaspaceUtils)) { 1116 log_debug(gc, verify)("MetaspaceUtils"); 1117 MetaspaceUtils::verify_free_chunks(); 1118 } 1119 if (should_verify_subset(Verify_JNIHandles)) { 1120 log_debug(gc, verify)("JNIHandles"); 1121 JNIHandles::verify(); 1122 } 1123 if (should_verify_subset(Verify_CodeCacheOops)) { 1124 log_debug(gc, verify)("CodeCache Oops"); 1125 CodeCache::verify_oops(); 1126 } 1127 if (should_verify_subset(Verify_ResolvedMethodTable)) { 1128 log_debug(gc, verify)("ResolvedMethodTable Oops"); 1129 ResolvedMethodTable::verify(); 1130 } 1131 1132 _verify_in_progress = false; 1133 } 1134 1135 1136 #ifndef PRODUCT 1137 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1138 assert(low_boundary < high_boundary, "bad interval"); 1139 1140 // decide which low-order bits we require to be clear: 1141 size_t alignSize = MinObjAlignmentInBytes; 1142 size_t min_object_size = CollectedHeap::min_fill_size(); 1143 1144 // make an inclusive limit: 1145 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1146 uintptr_t min = (uintptr_t)low_boundary; 1147 assert(min < max, "bad interval"); 1148 uintptr_t diff = max ^ min; 1149 1150 // throw away enough low-order bits to make the diff vanish 1151 uintptr_t mask = (uintptr_t)(-1); 1152 while ((mask & diff) != 0) 1153 mask <<= 1; 1154 uintptr_t bits = (min & mask); 1155 assert(bits == (max & mask), "correct mask"); 1156 // check an intermediate value between min and max, just to make sure: 1157 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1158 1159 // require address alignment, too: 1160 mask |= (alignSize - 1); 1161 1162 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1163 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1164 } 1165 _verify_oop_mask = mask; 1166 _verify_oop_bits = bits; 1167 } 1168 1169 // Oop verification (see MacroAssembler::verify_oop) 1170 1171 uintptr_t Universe::verify_oop_mask() { 1172 return _verify_oop_mask; 1173 } 1174 1175 uintptr_t Universe::verify_oop_bits() { 1176 return _verify_oop_bits; 1177 } 1178 1179 uintptr_t Universe::verify_mark_mask() { 1180 return markWord::lock_mask_in_place; 1181 } 1182 1183 uintptr_t Universe::verify_mark_bits() { 1184 intptr_t mask = verify_mark_mask(); 1185 intptr_t bits = (intptr_t)markWord::prototype().value(); 1186 assert((bits & ~mask) == 0, "no stray header bits"); 1187 return bits; 1188 } 1189 #endif // PRODUCT 1190 1191 1192 void LatestMethodCache::init(Klass* k, Method* m) { 1193 if (!UseSharedSpaces) { 1194 _klass = k; 1195 } 1196 #ifndef PRODUCT 1197 else { 1198 // sharing initilization should have already set up _klass 1199 assert(_klass != NULL, "just checking"); 1200 } 1201 #endif 1202 1203 _method_idnum = m->method_idnum(); 1204 assert(_method_idnum >= 0, "sanity check"); 1205 } 1206 1207 1208 Method* LatestMethodCache::get_method() { 1209 if (klass() == NULL) return NULL; 1210 InstanceKlass* ik = InstanceKlass::cast(klass()); 1211 Method* m = ik->method_with_idnum(method_idnum()); 1212 assert(m != NULL, "sanity check"); 1213 return m; 1214 } 1215 1216 1217 #ifdef ASSERT 1218 // Release dummy object(s) at bottom of heap 1219 bool Universe::release_fullgc_alot_dummy() { 1220 MutexLocker ml(FullGCALot_lock); 1221 if (_fullgc_alot_dummy_array != NULL) { 1222 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1223 // No more dummies to release, release entire array instead 1224 _fullgc_alot_dummy_array = NULL; 1225 return false; 1226 } 1227 if (!UseConcMarkSweepGC) { 1228 // Release dummy at bottom of old generation 1229 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1230 } 1231 // Release dummy at bottom of permanent generation 1232 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1233 } 1234 return true; 1235 } 1236 1237 #endif // ASSERT