1 /* 2 * Copyright (c) 1997, 2018, 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/systemDictionary.hpp" 32 #include "classfile/vmSymbols.hpp" 33 #include "code/codeBehaviours.hpp" 34 #include "code/codeCache.hpp" 35 #include "code/dependencies.hpp" 36 #include "gc/shared/collectedHeap.inline.hpp" 37 #include "gc/shared/gcArguments.hpp" 38 #include "gc/shared/gcConfig.hpp" 39 #include "gc/shared/gcTraceTime.inline.hpp" 40 #include "interpreter/interpreter.hpp" 41 #include "logging/log.hpp" 42 #include "logging/logStream.hpp" 43 #include "memory/heapShared.hpp" 44 #include "memory/filemap.hpp" 45 #include "memory/metadataFactory.hpp" 46 #include "memory/metaspaceClosure.hpp" 47 #include "memory/metaspaceCounters.hpp" 48 #include "memory/metaspaceShared.hpp" 49 #include "memory/oopFactory.hpp" 50 #include "memory/resourceArea.hpp" 51 #include "memory/universe.hpp" 52 #include "memory/universe.hpp" 53 #include "oops/constantPool.hpp" 54 #include "oops/instanceClassLoaderKlass.hpp" 55 #include "oops/instanceKlass.hpp" 56 #include "oops/instanceMirrorKlass.hpp" 57 #include "oops/instanceRefKlass.hpp" 58 #include "oops/objArrayOop.inline.hpp" 59 #include "oops/oop.inline.hpp" 60 #include "oops/typeArrayKlass.hpp" 61 #include "prims/resolvedMethodTable.hpp" 62 #include "runtime/arguments.hpp" 63 #include "runtime/atomic.hpp" 64 #include "runtime/deoptimization.hpp" 65 #include "runtime/flags/flagSetting.hpp" 66 #include "runtime/flags/jvmFlagConstraintList.hpp" 67 #include "runtime/handles.inline.hpp" 68 #include "runtime/init.hpp" 69 #include "runtime/java.hpp" 70 #include "runtime/javaCalls.hpp" 71 #include "runtime/sharedRuntime.hpp" 72 #include "runtime/synchronizer.hpp" 73 #include "runtime/thread.inline.hpp" 74 #include "runtime/timerTrace.hpp" 75 #include "runtime/vm_operations.hpp" 76 #include "services/memoryService.hpp" 77 #include "utilities/align.hpp" 78 #include "utilities/copy.hpp" 79 #include "utilities/debug.hpp" 80 #include "utilities/events.hpp" 81 #include "utilities/formatBuffer.hpp" 82 #include "utilities/hashtable.inline.hpp" 83 #include "utilities/macros.hpp" 84 #include "utilities/ostream.hpp" 85 #include "utilities/preserveException.hpp" 86 87 // Known objects 88 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ }; 89 Klass* Universe::_objectArrayKlassObj = NULL; 90 oop Universe::_int_mirror = NULL; 91 oop Universe::_float_mirror = NULL; 92 oop Universe::_double_mirror = NULL; 93 oop Universe::_byte_mirror = NULL; 94 oop Universe::_bool_mirror = NULL; 95 oop Universe::_char_mirror = NULL; 96 oop Universe::_long_mirror = NULL; 97 oop Universe::_short_mirror = NULL; 98 oop Universe::_void_mirror = NULL; 99 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 100 oop Universe::_main_thread_group = NULL; 101 oop Universe::_system_thread_group = NULL; 102 objArrayOop Universe::_the_empty_class_klass_array = NULL; 103 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 104 oop Universe::_the_null_sentinel = NULL; 105 oop Universe::_the_null_string = NULL; 106 oop Universe::_the_min_jint_string = NULL; 107 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 108 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 109 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 110 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 111 oop Universe::_out_of_memory_error_java_heap = NULL; 112 oop Universe::_out_of_memory_error_metaspace = NULL; 113 oop Universe::_out_of_memory_error_class_metaspace = NULL; 114 oop Universe::_out_of_memory_error_array_size = NULL; 115 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 116 oop Universe::_out_of_memory_error_realloc_objects = NULL; 117 oop Universe::_out_of_memory_error_retry = NULL; 118 oop Universe::_delayed_stack_overflow_error_message = NULL; 119 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 120 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 121 bool Universe::_verify_in_progress = false; 122 long Universe::verify_flags = Universe::Verify_All; 123 oop Universe::_null_ptr_exception_instance = NULL; 124 oop Universe::_arithmetic_exception_instance = NULL; 125 oop Universe::_virtual_machine_error_instance = NULL; 126 oop Universe::_vm_exception = NULL; 127 oop Universe::_reference_pending_list = NULL; 128 129 Array<int>* Universe::_the_empty_int_array = NULL; 130 Array<u2>* Universe::_the_empty_short_array = NULL; 131 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 132 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL; 133 Array<Method*>* Universe::_the_empty_method_array = NULL; 134 135 // These variables are guarded by FullGCALot_lock. 136 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 137 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 138 139 // Heap 140 int Universe::_verify_count = 0; 141 142 // Oop verification (see MacroAssembler::verify_oop) 143 uintptr_t Universe::_verify_oop_mask = 0; 144 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 145 146 int Universe::_base_vtable_size = 0; 147 bool Universe::_bootstrapping = false; 148 bool Universe::_module_initialized = false; 149 bool Universe::_fully_initialized = false; 150 151 size_t Universe::_heap_capacity_at_last_gc; 152 size_t Universe::_heap_used_at_last_gc = 0; 153 154 CollectedHeap* Universe::_collectedHeap = NULL; 155 156 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 157 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 158 address Universe::_narrow_ptrs_base; 159 uint64_t Universe::_narrow_klass_range = (uint64_t(max_juint)+1); 160 161 void Universe::basic_type_classes_do(void f(Klass*)) { 162 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 163 f(_typeArrayKlassObjs[i]); 164 } 165 } 166 167 void Universe::basic_type_classes_do(KlassClosure *closure) { 168 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 169 closure->do_klass(_typeArrayKlassObjs[i]); 170 } 171 } 172 173 void Universe::oops_do(OopClosure* f) { 174 175 f->do_oop((oop*) &_int_mirror); 176 f->do_oop((oop*) &_float_mirror); 177 f->do_oop((oop*) &_double_mirror); 178 f->do_oop((oop*) &_byte_mirror); 179 f->do_oop((oop*) &_bool_mirror); 180 f->do_oop((oop*) &_char_mirror); 181 f->do_oop((oop*) &_long_mirror); 182 f->do_oop((oop*) &_short_mirror); 183 f->do_oop((oop*) &_void_mirror); 184 185 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 186 f->do_oop((oop*) &_mirrors[i]); 187 } 188 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 189 190 f->do_oop((oop*)&_the_empty_class_klass_array); 191 f->do_oop((oop*)&_the_null_sentinel); 192 f->do_oop((oop*)&_the_null_string); 193 f->do_oop((oop*)&_the_min_jint_string); 194 f->do_oop((oop*)&_out_of_memory_error_java_heap); 195 f->do_oop((oop*)&_out_of_memory_error_metaspace); 196 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 197 f->do_oop((oop*)&_out_of_memory_error_array_size); 198 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 199 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 200 f->do_oop((oop*)&_out_of_memory_error_retry); 201 f->do_oop((oop*)&_delayed_stack_overflow_error_message); 202 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 203 f->do_oop((oop*)&_null_ptr_exception_instance); 204 f->do_oop((oop*)&_arithmetic_exception_instance); 205 f->do_oop((oop*)&_virtual_machine_error_instance); 206 f->do_oop((oop*)&_main_thread_group); 207 f->do_oop((oop*)&_system_thread_group); 208 f->do_oop((oop*)&_vm_exception); 209 f->do_oop((oop*)&_reference_pending_list); 210 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 211 } 212 213 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 214 it->push(&_klass); 215 } 216 217 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 218 for (int i = 0; i < T_LONG+1; i++) { 219 it->push(&_typeArrayKlassObjs[i]); 220 } 221 it->push(&_objectArrayKlassObj); 222 223 it->push(&_the_empty_int_array); 224 it->push(&_the_empty_short_array); 225 it->push(&_the_empty_klass_array); 226 it->push(&_the_empty_instance_klass_array); 227 it->push(&_the_empty_method_array); 228 it->push(&_the_array_interfaces_array); 229 230 _finalizer_register_cache->metaspace_pointers_do(it); 231 _loader_addClass_cache->metaspace_pointers_do(it); 232 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 233 _do_stack_walk_cache->metaspace_pointers_do(it); 234 } 235 236 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive 237 void Universe::serialize(SerializeClosure* f) { 238 239 for (int i = 0; i < T_LONG+1; i++) { 240 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 241 } 242 243 f->do_ptr((void**)&_objectArrayKlassObj); 244 #if INCLUDE_CDS_JAVA_HEAP 245 #ifdef ASSERT 246 if (DumpSharedSpaces && !HeapShared::is_heap_object_archiving_allowed()) { 247 assert(_int_mirror == NULL && _float_mirror == NULL && 248 _double_mirror == NULL && _byte_mirror == NULL && 249 _bool_mirror == NULL && _char_mirror == NULL && 250 _long_mirror == NULL && _short_mirror == NULL && 251 _void_mirror == NULL, "mirrors should be NULL"); 252 } 253 #endif 254 f->do_oop(&_int_mirror); 255 f->do_oop(&_float_mirror); 256 f->do_oop(&_double_mirror); 257 f->do_oop(&_byte_mirror); 258 f->do_oop(&_bool_mirror); 259 f->do_oop(&_char_mirror); 260 f->do_oop(&_long_mirror); 261 f->do_oop(&_short_mirror); 262 f->do_oop(&_void_mirror); 263 #endif 264 265 f->do_ptr((void**)&_the_array_interfaces_array); 266 f->do_ptr((void**)&_the_empty_int_array); 267 f->do_ptr((void**)&_the_empty_short_array); 268 f->do_ptr((void**)&_the_empty_method_array); 269 f->do_ptr((void**)&_the_empty_klass_array); 270 f->do_ptr((void**)&_the_empty_instance_klass_array); 271 _finalizer_register_cache->serialize(f); 272 _loader_addClass_cache->serialize(f); 273 _throw_illegal_access_error_cache->serialize(f); 274 _do_stack_walk_cache->serialize(f); 275 } 276 277 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 278 if (size < alignment || size % alignment != 0) { 279 vm_exit_during_initialization( 280 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 281 } 282 } 283 284 void initialize_basic_type_klass(Klass* k, TRAPS) { 285 Klass* ok = SystemDictionary::Object_klass(); 286 #if INCLUDE_CDS 287 if (UseSharedSpaces) { 288 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 289 assert(k->super() == ok, "u3"); 290 k->restore_unshareable_info(loader_data, Handle(), CHECK); 291 } else 292 #endif 293 { 294 k->initialize_supers(ok, NULL, CHECK); 295 } 296 k->append_to_sibling_list(); 297 } 298 299 void Universe::genesis(TRAPS) { 300 ResourceMark rm; 301 302 { FlagSetting fs(_bootstrapping, true); 303 304 { MutexLocker mc(Compile_lock); 305 306 java_lang_Class::allocate_fixup_lists(); 307 308 // determine base vtable size; without that we cannot create the array klasses 309 compute_base_vtable_size(); 310 311 if (!UseSharedSpaces) { 312 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 313 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 314 } 315 316 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 317 318 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 319 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 320 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 321 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 322 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 323 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 324 } 325 } 326 327 vmSymbols::initialize(CHECK); 328 329 SystemDictionary::initialize(CHECK); 330 331 Klass* ok = SystemDictionary::Object_klass(); 332 333 _the_null_string = StringTable::intern("null", CHECK); 334 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 335 336 #if INCLUDE_CDS 337 if (UseSharedSpaces) { 338 // Verify shared interfaces array. 339 assert(_the_array_interfaces_array->at(0) == 340 SystemDictionary::Cloneable_klass(), "u3"); 341 assert(_the_array_interfaces_array->at(1) == 342 SystemDictionary::Serializable_klass(), "u3"); 343 } else 344 #endif 345 { 346 // Set up shared interfaces array. (Do this before supers are set up.) 347 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 348 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 349 } 350 351 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 352 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 353 initialize_basic_type_klass(floatArrayKlassObj(), CHECK); 354 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 355 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 356 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 357 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 358 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 359 } // end of core bootstrapping 360 361 { 362 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 363 _the_null_sentinel = tns(); 364 } 365 366 // Maybe this could be lifted up now that object array can be initialized 367 // during the bootstrapping. 368 369 // OLD 370 // Initialize _objectArrayKlass after core bootstraping to make 371 // sure the super class is set up properly for _objectArrayKlass. 372 // --- 373 // NEW 374 // Since some of the old system object arrays have been converted to 375 // ordinary object arrays, _objectArrayKlass will be loaded when 376 // SystemDictionary::initialize(CHECK); is run. See the extra check 377 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 378 _objectArrayKlassObj = InstanceKlass:: 379 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 380 // OLD 381 // Add the class to the class hierarchy manually to make sure that 382 // its vtable is initialized after core bootstrapping is completed. 383 // --- 384 // New 385 // Have already been initialized. 386 _objectArrayKlassObj->append_to_sibling_list(); 387 388 #ifdef ASSERT 389 if (FullGCALot) { 390 // Allocate an array of dummy objects. 391 // We'd like these to be at the bottom of the old generation, 392 // so that when we free one and then collect, 393 // (almost) the whole heap moves 394 // and we find out if we actually update all the oops correctly. 395 // But we can't allocate directly in the old generation, 396 // so we allocate wherever, and hope that the first collection 397 // moves these objects to the bottom of the old generation. 398 // We can allocate directly in the permanent generation, so we do. 399 int size; 400 if (UseConcMarkSweepGC) { 401 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate"); 402 size = FullGCALotDummies; 403 } else { 404 size = FullGCALotDummies * 2; 405 } 406 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 407 objArrayHandle dummy_array(THREAD, naked_array); 408 int i = 0; 409 while (i < size) { 410 // Allocate dummy in old generation 411 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 412 dummy_array->obj_at_put(i++, dummy); 413 } 414 { 415 // Only modify the global variable inside the mutex. 416 // If we had a race to here, the other dummy_array instances 417 // and their elements just get dropped on the floor, which is fine. 418 MutexLocker ml(FullGCALot_lock); 419 if (_fullgc_alot_dummy_array == NULL) { 420 _fullgc_alot_dummy_array = dummy_array(); 421 } 422 } 423 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 424 } 425 #endif 426 } 427 428 void Universe::initialize_basic_type_mirrors(TRAPS) { 429 #if INCLUDE_CDS_JAVA_HEAP 430 if (UseSharedSpaces && 431 HeapShared::open_archive_heap_region_mapped() && 432 _int_mirror != NULL) { 433 assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity"); 434 assert(_float_mirror != NULL && _double_mirror != NULL && 435 _byte_mirror != NULL && _byte_mirror != NULL && 436 _bool_mirror != NULL && _char_mirror != NULL && 437 _long_mirror != NULL && _short_mirror != NULL && 438 _void_mirror != NULL, "Sanity"); 439 } else 440 #endif 441 { 442 _int_mirror = 443 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 444 _float_mirror = 445 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 446 _double_mirror = 447 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 448 _byte_mirror = 449 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 450 _bool_mirror = 451 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 452 _char_mirror = 453 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 454 _long_mirror = 455 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 456 _short_mirror = 457 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 458 _void_mirror = 459 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 460 } 461 462 _mirrors[T_INT] = _int_mirror; 463 _mirrors[T_FLOAT] = _float_mirror; 464 _mirrors[T_DOUBLE] = _double_mirror; 465 _mirrors[T_BYTE] = _byte_mirror; 466 _mirrors[T_BOOLEAN] = _bool_mirror; 467 _mirrors[T_CHAR] = _char_mirror; 468 _mirrors[T_LONG] = _long_mirror; 469 _mirrors[T_SHORT] = _short_mirror; 470 _mirrors[T_VOID] = _void_mirror; 471 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 472 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 473 } 474 475 void Universe::fixup_mirrors(TRAPS) { 476 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 477 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 478 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 479 // that the number of objects allocated at this point is very small. 480 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 481 HandleMark hm(THREAD); 482 483 if (!UseSharedSpaces) { 484 // Cache the start of the static fields 485 InstanceMirrorKlass::init_offset_of_static_fields(); 486 } 487 488 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 489 int list_length = list->length(); 490 for (int i = 0; i < list_length; i++) { 491 Klass* k = list->at(i); 492 assert(k->is_klass(), "List should only hold classes"); 493 EXCEPTION_MARK; 494 java_lang_Class::fixup_mirror(k, CATCH); 495 } 496 delete java_lang_Class::fixup_mirror_list(); 497 java_lang_Class::set_fixup_mirror_list(NULL); 498 } 499 500 #define assert_pll_locked(test) \ 501 assert(Heap_lock->test(), "Reference pending list access requires lock") 502 503 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 504 505 oop Universe::reference_pending_list() { 506 if (Thread::current()->is_VM_thread()) { 507 assert_pll_locked(is_locked); 508 } else { 509 assert_pll_ownership(); 510 } 511 return _reference_pending_list; 512 } 513 514 void Universe::set_reference_pending_list(oop list) { 515 assert_pll_ownership(); 516 _reference_pending_list = list; 517 } 518 519 bool Universe::has_reference_pending_list() { 520 assert_pll_ownership(); 521 return _reference_pending_list != NULL; 522 } 523 524 oop Universe::swap_reference_pending_list(oop list) { 525 assert_pll_locked(is_locked); 526 return Atomic::xchg(list, &_reference_pending_list); 527 } 528 529 #undef assert_pll_locked 530 #undef assert_pll_ownership 531 532 // initialize_vtable could cause gc if 533 // 1) we specified true to initialize_vtable and 534 // 2) this ran after gc was enabled 535 // In case those ever change we use handles for oops 536 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) { 537 // init vtable of k and all subclasses 538 ko->vtable().initialize_vtable(false, CHECK); 539 if (ko->is_instance_klass()) { 540 for (Klass* sk = ko->subklass(); 541 sk != NULL; 542 sk = sk->next_sibling()) { 543 reinitialize_vtable_of(sk, CHECK); 544 } 545 } 546 } 547 548 549 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) { 550 k->itable().initialize_itable(false, CHECK); 551 } 552 553 554 void Universe::reinitialize_itables(TRAPS) { 555 MutexLocker mcld(ClassLoaderDataGraph_lock); 556 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK); 557 } 558 559 560 bool Universe::on_page_boundary(void* addr) { 561 return is_aligned(addr, os::vm_page_size()); 562 } 563 564 565 bool Universe::should_fill_in_stack_trace(Handle throwable) { 566 // never attempt to fill in the stack trace of preallocated errors that do not have 567 // backtrace. These errors are kept alive forever and may be "re-used" when all 568 // preallocated errors with backtrace have been consumed. Also need to avoid 569 // a potential loop which could happen if an out of memory occurs when attempting 570 // to allocate the backtrace. 571 return ((!oopDesc::equals(throwable(), Universe::_out_of_memory_error_java_heap)) && 572 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_metaspace)) && 573 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_class_metaspace)) && 574 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_array_size)) && 575 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_gc_overhead_limit)) && 576 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_realloc_objects)) && 577 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_retry))); 578 } 579 580 581 oop Universe::gen_out_of_memory_error(oop default_err) { 582 // generate an out of memory error: 583 // - if there is a preallocated error and stack traces are available 584 // (j.l.Throwable is initialized), then return the preallocated 585 // error with a filled in stack trace, and with the message 586 // provided by the default error. 587 // - otherwise, return the default error, without a stack trace. 588 int next; 589 if ((_preallocated_out_of_memory_error_avail_count > 0) && 590 SystemDictionary::Throwable_klass()->is_initialized()) { 591 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 592 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 593 } else { 594 next = -1; 595 } 596 if (next < 0) { 597 // all preallocated errors have been used. 598 // return default 599 return default_err; 600 } else { 601 Thread* THREAD = Thread::current(); 602 Handle default_err_h(THREAD, default_err); 603 // get the error object at the slot and set set it to NULL so that the 604 // array isn't keeping it alive anymore. 605 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next)); 606 assert(exc() != NULL, "slot has been used already"); 607 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 608 609 // use the message from the default error 610 oop msg = java_lang_Throwable::message(default_err_h()); 611 assert(msg != NULL, "no message"); 612 java_lang_Throwable::set_message(exc(), msg); 613 614 // populate the stack trace and return it. 615 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 616 return exc(); 617 } 618 } 619 620 intptr_t Universe::_non_oop_bits = 0; 621 622 void* Universe::non_oop_word() { 623 // Neither the high bits nor the low bits of this value is allowed 624 // to look like (respectively) the high or low bits of a real oop. 625 // 626 // High and low are CPU-specific notions, but low always includes 627 // the low-order bit. Since oops are always aligned at least mod 4, 628 // setting the low-order bit will ensure that the low half of the 629 // word will never look like that of a real oop. 630 // 631 // Using the OS-supplied non-memory-address word (usually 0 or -1) 632 // will take care of the high bits, however many there are. 633 634 if (_non_oop_bits == 0) { 635 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 636 } 637 638 return (void*)_non_oop_bits; 639 } 640 641 static void initialize_global_behaviours() { 642 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour()); 643 } 644 645 jint universe_init() { 646 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 647 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 648 "LogHeapWordSize is incorrect."); 649 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 650 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 651 "oop size is not not a multiple of HeapWord size"); 652 653 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 654 655 JavaClasses::compute_hard_coded_offsets(); 656 657 initialize_global_behaviours(); 658 659 jint status = Universe::initialize_heap(); 660 if (status != JNI_OK) { 661 return status; 662 } 663 664 SystemDictionary::initialize_oop_storage(); 665 666 Metaspace::global_initialize(); 667 668 // Initialize performance counters for metaspaces 669 MetaspaceCounters::initialize_performance_counters(); 670 CompressedClassSpaceCounters::initialize_performance_counters(); 671 672 AOTLoader::universe_init(); 673 674 // Checks 'AfterMemoryInit' constraints. 675 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) { 676 return JNI_EINVAL; 677 } 678 679 // Create memory for metadata. Must be after initializing heap for 680 // DumpSharedSpaces. 681 ClassLoaderData::init_null_class_loader_data(); 682 683 // We have a heap so create the Method* caches before 684 // Metaspace::initialize_shared_spaces() tries to populate them. 685 Universe::_finalizer_register_cache = new LatestMethodCache(); 686 Universe::_loader_addClass_cache = new LatestMethodCache(); 687 Universe::_throw_illegal_access_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 #if INCLUDE_CDS 706 if (DumpSharedSpaces) { 707 MetaspaceShared::prepare_for_dumping(); 708 } 709 #endif 710 } 711 if (strlen(VerifySubSet) > 0) { 712 Universe::initialize_verify_flags(); 713 } 714 715 ResolvedMethodTable::create_table(); 716 717 return JNI_OK; 718 } 719 720 CollectedHeap* Universe::create_heap() { 721 assert(_collectedHeap == NULL, "Heap already created"); 722 return GCConfig::arguments()->create_heap(); 723 } 724 725 // Choose the heap base address and oop encoding mode 726 // when compressed oops are used: 727 // Unscaled - Use 32-bits oops without encoding when 728 // NarrowOopHeapBaseMin + heap_size < 4Gb 729 // ZeroBased - Use zero based compressed oops with encoding when 730 // NarrowOopHeapBaseMin + heap_size < 32Gb 731 // HeapBased - Use compressed oops with heap base + encoding. 732 733 jint Universe::initialize_heap() { 734 _collectedHeap = create_heap(); 735 jint status = _collectedHeap->initialize(); 736 if (status != JNI_OK) { 737 return status; 738 } 739 log_info(gc)("Using %s", _collectedHeap->name()); 740 741 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 742 743 #ifdef _LP64 744 if (UseCompressedOops) { 745 // Subtract a page because something can get allocated at heap base. 746 // This also makes implicit null checking work, because the 747 // memory+1 page below heap_base needs to cause a signal. 748 // See needs_explicit_null_check. 749 // Only set the heap base for compressed oops because it indicates 750 // compressed oops for pstack code. 751 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 752 // Didn't reserve heap below 4Gb. Must shift. 753 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 754 } 755 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 756 // Did reserve heap below 32Gb. Can use base == 0; 757 Universe::set_narrow_oop_base(0); 758 } 759 AOTLoader::set_narrow_oop_shift(); 760 761 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 762 763 LogTarget(Info, gc, heap, coops) lt; 764 if (lt.is_enabled()) { 765 ResourceMark rm; 766 LogStream ls(lt); 767 Universe::print_compressed_oops_mode(&ls); 768 } 769 770 // Tell tests in which mode we run. 771 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 772 narrow_oop_mode_to_string(narrow_oop_mode()), 773 false)); 774 } 775 // Universe::narrow_oop_base() is one page below the heap. 776 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 777 os::vm_page_size()) || 778 Universe::narrow_oop_base() == NULL, "invalid value"); 779 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 780 Universe::narrow_oop_shift() == 0, "invalid value"); 781 #endif 782 783 // We will never reach the CATCH below since Exceptions::_throw will cause 784 // the VM to exit if an exception is thrown during initialization 785 786 if (UseTLAB) { 787 assert(Universe::heap()->supports_tlab_allocation(), 788 "Should support thread-local allocation buffers"); 789 ThreadLocalAllocBuffer::startup_initialization(); 790 } 791 return JNI_OK; 792 } 793 794 void Universe::print_compressed_oops_mode(outputStream* st) { 795 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 796 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 797 798 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 799 800 if (Universe::narrow_oop_base() != 0) { 801 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 802 } 803 804 if (Universe::narrow_oop_shift() != 0) { 805 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 806 } 807 808 if (!Universe::narrow_oop_use_implicit_null_checks()) { 809 st->print(", no protected page in front of the heap"); 810 } 811 st->cr(); 812 } 813 814 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 815 816 assert(alignment <= Arguments::conservative_max_heap_alignment(), 817 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 818 alignment, Arguments::conservative_max_heap_alignment()); 819 820 size_t total_reserved = align_up(heap_size, alignment); 821 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 822 "heap size is too big for compressed oops"); 823 824 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size()); 825 assert(!UseLargePages 826 || UseParallelGC 827 || use_large_pages, "Wrong alignment to use large pages"); 828 829 // Now create the space. 830 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt); 831 832 if (total_rs.is_reserved()) { 833 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 834 "must be exactly of required size and alignment"); 835 // We are good. 836 837 if (UseCompressedOops) { 838 // Universe::initialize_heap() will reset this to NULL if unscaled 839 // or zero-based narrow oops are actually used. 840 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 841 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 842 } 843 844 if (AllocateHeapAt != NULL) { 845 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 846 } 847 return total_rs; 848 } 849 850 vm_exit_during_initialization( 851 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 852 total_reserved/K)); 853 854 // satisfy compiler 855 ShouldNotReachHere(); 856 return ReservedHeapSpace(0, 0, false); 857 } 858 859 860 // It's the caller's responsibility to ensure glitch-freedom 861 // (if required). 862 void Universe::update_heap_info_at_gc() { 863 _heap_capacity_at_last_gc = heap()->capacity(); 864 _heap_used_at_last_gc = heap()->used(); 865 } 866 867 868 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 869 switch (mode) { 870 case UnscaledNarrowOop: 871 return "32-bit"; 872 case ZeroBasedNarrowOop: 873 return "Zero based"; 874 case DisjointBaseNarrowOop: 875 return "Non-zero disjoint base"; 876 case HeapBasedNarrowOop: 877 return "Non-zero based"; 878 default: 879 ShouldNotReachHere(); 880 return ""; 881 } 882 } 883 884 885 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 886 if (narrow_oop_base_disjoint()) { 887 return DisjointBaseNarrowOop; 888 } 889 890 if (narrow_oop_base() != 0) { 891 return HeapBasedNarrowOop; 892 } 893 894 if (narrow_oop_shift() != 0) { 895 return ZeroBasedNarrowOop; 896 } 897 898 return UnscaledNarrowOop; 899 } 900 901 void initialize_known_method(LatestMethodCache* method_cache, 902 InstanceKlass* ik, 903 const char* method, 904 Symbol* signature, 905 bool is_static, TRAPS) 906 { 907 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK); 908 Method* m = NULL; 909 // The klass must be linked before looking up the method. 910 if (!ik->link_class_or_fail(THREAD) || 911 ((m = ik->find_method(name, signature)) == NULL) || 912 is_static != m->is_static()) { 913 ResourceMark rm(THREAD); 914 // NoSuchMethodException doesn't actually work because it tries to run the 915 // <init> function before java_lang_Class is linked. Print error and exit. 916 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 917 ik->name()->as_C_string(), method)); 918 } 919 method_cache->init(ik, m); 920 } 921 922 void Universe::initialize_known_methods(TRAPS) { 923 // Set up static method for registering finalizers 924 initialize_known_method(_finalizer_register_cache, 925 SystemDictionary::Finalizer_klass(), 926 "register", 927 vmSymbols::object_void_signature(), true, CHECK); 928 929 initialize_known_method(_throw_illegal_access_error_cache, 930 SystemDictionary::internal_Unsafe_klass(), 931 "throwIllegalAccessError", 932 vmSymbols::void_method_signature(), true, CHECK); 933 934 // Set up method for registering loaded classes in class loader vector 935 initialize_known_method(_loader_addClass_cache, 936 SystemDictionary::ClassLoader_klass(), 937 "addClass", 938 vmSymbols::class_void_signature(), false, CHECK); 939 940 // Set up method for stack walking 941 initialize_known_method(_do_stack_walk_cache, 942 SystemDictionary::AbstractStackWalker_klass(), 943 "doStackWalk", 944 vmSymbols::doStackWalk_signature(), false, CHECK); 945 } 946 947 void universe2_init() { 948 EXCEPTION_MARK; 949 Universe::genesis(CATCH); 950 } 951 952 // Set after initialization of the module runtime, call_initModuleRuntime 953 void universe_post_module_init() { 954 Universe::_module_initialized = true; 955 } 956 957 bool universe_post_init() { 958 assert(!is_init_completed(), "Error: initialization not yet completed!"); 959 Universe::_fully_initialized = true; 960 EXCEPTION_MARK; 961 { ResourceMark rm; 962 Interpreter::initialize(); // needed for interpreter entry points 963 if (!UseSharedSpaces) { 964 HandleMark hm(THREAD); 965 Klass* ok = SystemDictionary::Object_klass(); 966 Universe::reinitialize_vtable_of(ok, CHECK_false); 967 Universe::reinitialize_itables(CHECK_false); 968 } 969 } 970 971 HandleMark hm(THREAD); 972 // Setup preallocated empty java.lang.Class array 973 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 974 975 // Setup preallocated OutOfMemoryError errors 976 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 977 InstanceKlass* ik = InstanceKlass::cast(k); 978 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false); 979 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false); 980 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false); 981 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false); 982 Universe::_out_of_memory_error_gc_overhead_limit = 983 ik->allocate_instance(CHECK_false); 984 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false); 985 Universe::_out_of_memory_error_retry = ik->allocate_instance(CHECK_false); 986 987 // Setup preallocated cause message for delayed StackOverflowError 988 if (StackReservedPages > 0) { 989 Universe::_delayed_stack_overflow_error_message = 990 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 991 } 992 993 // Setup preallocated NullPointerException 994 // (this is currently used for a cheap & dirty solution in compiler exception handling) 995 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 996 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 997 // Setup preallocated ArithmeticException 998 // (this is currently used for a cheap & dirty solution in compiler exception handling) 999 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1000 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1001 // Virtual Machine Error for when we get into a situation we can't resolve 1002 k = SystemDictionary::resolve_or_fail( 1003 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1004 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1005 if (!linked) { 1006 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1007 return false; // initialization failed 1008 } 1009 Universe::_virtual_machine_error_instance = 1010 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1011 1012 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1013 1014 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1015 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1016 1017 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 1018 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1019 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 1020 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1021 1022 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1023 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1024 1025 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1026 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1027 1028 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 1029 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 1030 1031 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK_false); 1032 java_lang_Throwable::set_message(Universe::_out_of_memory_error_retry, msg()); 1033 1034 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1035 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1036 1037 // Setup the array of errors that have preallocated backtrace 1038 k = Universe::_out_of_memory_error_java_heap->klass(); 1039 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1040 ik = InstanceKlass::cast(k); 1041 1042 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1043 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false); 1044 for (int i=0; i<len; i++) { 1045 oop err = ik->allocate_instance(CHECK_false); 1046 Handle err_h = Handle(THREAD, err); 1047 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1048 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1049 } 1050 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1051 1052 Universe::initialize_known_methods(CHECK_false); 1053 1054 // This needs to be done before the first scavenge/gc, since 1055 // it's an input to soft ref clearing policy. 1056 { 1057 MutexLocker x(Heap_lock); 1058 Universe::update_heap_info_at_gc(); 1059 } 1060 1061 // ("weak") refs processing infrastructure initialization 1062 Universe::heap()->post_initialize(); 1063 1064 MemoryService::add_metaspace_memory_pools(); 1065 1066 MemoryService::set_universe_heap(Universe::heap()); 1067 #if INCLUDE_CDS 1068 MetaspaceShared::post_initialize(CHECK_false); 1069 #endif 1070 return true; 1071 } 1072 1073 1074 void Universe::compute_base_vtable_size() { 1075 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1076 } 1077 1078 void Universe::print_on(outputStream* st) { 1079 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1080 st->print_cr("Heap"); 1081 heap()->print_on(st); 1082 } 1083 1084 void Universe::print_heap_at_SIGBREAK() { 1085 if (PrintHeapAtSIGBREAK) { 1086 print_on(tty); 1087 tty->cr(); 1088 tty->flush(); 1089 } 1090 } 1091 1092 void Universe::print_heap_before_gc() { 1093 LogTarget(Debug, gc, heap) lt; 1094 if (lt.is_enabled()) { 1095 LogStream ls(lt); 1096 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1097 ResourceMark rm; 1098 heap()->print_on(&ls); 1099 } 1100 } 1101 1102 void Universe::print_heap_after_gc() { 1103 LogTarget(Debug, gc, heap) lt; 1104 if (lt.is_enabled()) { 1105 LogStream ls(lt); 1106 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1107 ResourceMark rm; 1108 heap()->print_on(&ls); 1109 } 1110 } 1111 1112 void Universe::initialize_verify_flags() { 1113 verify_flags = 0; 1114 const char delimiter[] = " ,"; 1115 1116 size_t length = strlen(VerifySubSet); 1117 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1118 strncpy(subset_list, VerifySubSet, length + 1); 1119 1120 char* token = strtok(subset_list, delimiter); 1121 while (token != NULL) { 1122 if (strcmp(token, "threads") == 0) { 1123 verify_flags |= Verify_Threads; 1124 } else if (strcmp(token, "heap") == 0) { 1125 verify_flags |= Verify_Heap; 1126 } else if (strcmp(token, "symbol_table") == 0) { 1127 verify_flags |= Verify_SymbolTable; 1128 } else if (strcmp(token, "string_table") == 0) { 1129 verify_flags |= Verify_StringTable; 1130 } else if (strcmp(token, "codecache") == 0) { 1131 verify_flags |= Verify_CodeCache; 1132 } else if (strcmp(token, "dictionary") == 0) { 1133 verify_flags |= Verify_SystemDictionary; 1134 } else if (strcmp(token, "classloader_data_graph") == 0) { 1135 verify_flags |= Verify_ClassLoaderDataGraph; 1136 } else if (strcmp(token, "metaspace") == 0) { 1137 verify_flags |= Verify_MetaspaceUtils; 1138 } else if (strcmp(token, "jni_handles") == 0) { 1139 verify_flags |= Verify_JNIHandles; 1140 } else if (strcmp(token, "codecache_oops") == 0) { 1141 verify_flags |= Verify_CodeCacheOops; 1142 } else { 1143 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1144 } 1145 token = strtok(NULL, delimiter); 1146 } 1147 FREE_C_HEAP_ARRAY(char, subset_list); 1148 } 1149 1150 bool Universe::should_verify_subset(uint subset) { 1151 if (verify_flags & subset) { 1152 return true; 1153 } 1154 return false; 1155 } 1156 1157 void Universe::verify(VerifyOption option, const char* prefix) { 1158 // The use of _verify_in_progress is a temporary work around for 1159 // 6320749. Don't bother with a creating a class to set and clear 1160 // it since it is only used in this method and the control flow is 1161 // straight forward. 1162 _verify_in_progress = true; 1163 1164 COMPILER2_PRESENT( 1165 assert(!DerivedPointerTable::is_active(), 1166 "DPT should not be active during verification " 1167 "(of thread stacks below)"); 1168 ) 1169 1170 ResourceMark rm; 1171 HandleMark hm; // Handles created during verification can be zapped 1172 _verify_count++; 1173 1174 FormatBuffer<> title("Verifying %s", prefix); 1175 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1176 if (should_verify_subset(Verify_Threads)) { 1177 log_debug(gc, verify)("Threads"); 1178 Threads::verify(); 1179 } 1180 if (should_verify_subset(Verify_Heap)) { 1181 log_debug(gc, verify)("Heap"); 1182 heap()->verify(option); 1183 } 1184 if (should_verify_subset(Verify_SymbolTable)) { 1185 log_debug(gc, verify)("SymbolTable"); 1186 SymbolTable::verify(); 1187 } 1188 if (should_verify_subset(Verify_StringTable)) { 1189 log_debug(gc, verify)("StringTable"); 1190 StringTable::verify(); 1191 } 1192 if (should_verify_subset(Verify_CodeCache)) { 1193 { 1194 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1195 log_debug(gc, verify)("CodeCache"); 1196 CodeCache::verify(); 1197 } 1198 } 1199 if (should_verify_subset(Verify_SystemDictionary)) { 1200 log_debug(gc, verify)("SystemDictionary"); 1201 SystemDictionary::verify(); 1202 } 1203 #ifndef PRODUCT 1204 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1205 log_debug(gc, verify)("ClassLoaderDataGraph"); 1206 ClassLoaderDataGraph::verify(); 1207 } 1208 #endif 1209 if (should_verify_subset(Verify_MetaspaceUtils)) { 1210 log_debug(gc, verify)("MetaspaceUtils"); 1211 MetaspaceUtils::verify_free_chunks(); 1212 } 1213 if (should_verify_subset(Verify_JNIHandles)) { 1214 log_debug(gc, verify)("JNIHandles"); 1215 JNIHandles::verify(); 1216 } 1217 if (should_verify_subset(Verify_CodeCacheOops)) { 1218 log_debug(gc, verify)("CodeCache Oops"); 1219 CodeCache::verify_oops(); 1220 } 1221 1222 _verify_in_progress = false; 1223 } 1224 1225 1226 #ifndef PRODUCT 1227 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1228 assert(low_boundary < high_boundary, "bad interval"); 1229 1230 // decide which low-order bits we require to be clear: 1231 size_t alignSize = MinObjAlignmentInBytes; 1232 size_t min_object_size = CollectedHeap::min_fill_size(); 1233 1234 // make an inclusive limit: 1235 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1236 uintptr_t min = (uintptr_t)low_boundary; 1237 assert(min < max, "bad interval"); 1238 uintptr_t diff = max ^ min; 1239 1240 // throw away enough low-order bits to make the diff vanish 1241 uintptr_t mask = (uintptr_t)(-1); 1242 while ((mask & diff) != 0) 1243 mask <<= 1; 1244 uintptr_t bits = (min & mask); 1245 assert(bits == (max & mask), "correct mask"); 1246 // check an intermediate value between min and max, just to make sure: 1247 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1248 1249 // require address alignment, too: 1250 mask |= (alignSize - 1); 1251 1252 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1253 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1254 } 1255 _verify_oop_mask = mask; 1256 _verify_oop_bits = bits; 1257 } 1258 1259 // Oop verification (see MacroAssembler::verify_oop) 1260 1261 uintptr_t Universe::verify_oop_mask() { 1262 MemRegion m = heap()->reserved_region(); 1263 calculate_verify_data(m.start(), m.end()); 1264 return _verify_oop_mask; 1265 } 1266 1267 uintptr_t Universe::verify_oop_bits() { 1268 MemRegion m = heap()->reserved_region(); 1269 calculate_verify_data(m.start(), m.end()); 1270 return _verify_oop_bits; 1271 } 1272 1273 uintptr_t Universe::verify_mark_mask() { 1274 return markOopDesc::lock_mask_in_place; 1275 } 1276 1277 uintptr_t Universe::verify_mark_bits() { 1278 intptr_t mask = verify_mark_mask(); 1279 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1280 assert((bits & ~mask) == 0, "no stray header bits"); 1281 return bits; 1282 } 1283 #endif // PRODUCT 1284 1285 1286 void Universe::compute_verify_oop_data() { 1287 verify_oop_mask(); 1288 verify_oop_bits(); 1289 verify_mark_mask(); 1290 verify_mark_bits(); 1291 } 1292 1293 1294 void LatestMethodCache::init(Klass* k, Method* m) { 1295 if (!UseSharedSpaces) { 1296 _klass = k; 1297 } 1298 #ifndef PRODUCT 1299 else { 1300 // sharing initilization should have already set up _klass 1301 assert(_klass != NULL, "just checking"); 1302 } 1303 #endif 1304 1305 _method_idnum = m->method_idnum(); 1306 assert(_method_idnum >= 0, "sanity check"); 1307 } 1308 1309 1310 Method* LatestMethodCache::get_method() { 1311 if (klass() == NULL) return NULL; 1312 InstanceKlass* ik = InstanceKlass::cast(klass()); 1313 Method* m = ik->method_with_idnum(method_idnum()); 1314 assert(m != NULL, "sanity check"); 1315 return m; 1316 } 1317 1318 1319 #ifdef ASSERT 1320 // Release dummy object(s) at bottom of heap 1321 bool Universe::release_fullgc_alot_dummy() { 1322 MutexLocker ml(FullGCALot_lock); 1323 if (_fullgc_alot_dummy_array != NULL) { 1324 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1325 // No more dummies to release, release entire array instead 1326 _fullgc_alot_dummy_array = NULL; 1327 return false; 1328 } 1329 if (!UseConcMarkSweepGC) { 1330 // Release dummy at bottom of old generation 1331 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1332 } 1333 // Release dummy at bottom of permanent generation 1334 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1335 } 1336 return true; 1337 } 1338 1339 #endif // ASSERT