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/classLoaderData.hpp" 29 #include "classfile/javaClasses.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "classfile/vmSymbols.hpp" 33 #include "code/codeCache.hpp" 34 #include "code/dependencies.hpp" 35 #include "gc/shared/collectedHeap.inline.hpp" 36 #include "gc/shared/gcArguments.hpp" 37 #include "gc/shared/gcConfig.hpp" 38 #include "gc/shared/gcTraceTime.inline.hpp" 39 #include "interpreter/interpreter.hpp" 40 #include "logging/log.hpp" 41 #include "logging/logStream.hpp" 42 #include "memory/filemap.hpp" 43 #include "memory/metadataFactory.hpp" 44 #include "memory/metaspaceClosure.hpp" 45 #include "memory/metaspaceCounters.hpp" 46 #include "memory/metaspaceShared.hpp" 47 #include "memory/oopFactory.hpp" 48 #include "memory/resourceArea.hpp" 49 #include "memory/universe.hpp" 50 #include "memory/universe.hpp" 51 #include "oops/constantPool.hpp" 52 #include "oops/instanceClassLoaderKlass.hpp" 53 #include "oops/instanceKlass.hpp" 54 #include "oops/instanceMirrorKlass.hpp" 55 #include "oops/instanceRefKlass.hpp" 56 #include "oops/objArrayOop.inline.hpp" 57 #include "oops/oop.inline.hpp" 58 #include "oops/typeArrayKlass.hpp" 59 #include "prims/resolvedMethodTable.hpp" 60 #include "runtime/arguments.hpp" 61 #include "runtime/atomic.hpp" 62 #include "runtime/flags/flagSetting.hpp" 63 #include "runtime/flags/jvmFlagConstraintList.hpp" 64 #include "runtime/deoptimization.hpp" 65 #include "runtime/handles.inline.hpp" 66 #include "runtime/init.hpp" 67 #include "runtime/java.hpp" 68 #include "runtime/javaCalls.hpp" 69 #include "runtime/sharedRuntime.hpp" 70 #include "runtime/synchronizer.hpp" 71 #include "runtime/thread.inline.hpp" 72 #include "runtime/timerTrace.hpp" 73 #include "runtime/vm_operations.hpp" 74 #include "services/memoryService.hpp" 75 #include "utilities/align.hpp" 76 #include "utilities/copy.hpp" 77 #include "utilities/debug.hpp" 78 #include "utilities/events.hpp" 79 #include "utilities/formatBuffer.hpp" 80 #include "utilities/hashtable.inline.hpp" 81 #include "utilities/macros.hpp" 82 #include "utilities/ostream.hpp" 83 #include "utilities/preserveException.hpp" 84 85 // Known objects 86 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ }; 87 Klass* Universe::_objectArrayKlassObj = NULL; 88 oop Universe::_int_mirror = NULL; 89 oop Universe::_float_mirror = NULL; 90 oop Universe::_double_mirror = NULL; 91 oop Universe::_byte_mirror = NULL; 92 oop Universe::_bool_mirror = NULL; 93 oop Universe::_char_mirror = NULL; 94 oop Universe::_long_mirror = NULL; 95 oop Universe::_short_mirror = NULL; 96 oop Universe::_void_mirror = NULL; 97 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 98 oop Universe::_main_thread_group = NULL; 99 oop Universe::_system_thread_group = NULL; 100 objArrayOop Universe::_the_empty_class_klass_array = NULL; 101 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 102 oop Universe::_the_null_sentinel = NULL; 103 oop Universe::_the_null_string = NULL; 104 oop Universe::_the_min_jint_string = NULL; 105 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 106 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 107 LatestMethodCache* Universe::_pd_implies_cache = NULL; 108 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 109 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 110 oop Universe::_out_of_memory_error_java_heap = NULL; 111 oop Universe::_out_of_memory_error_metaspace = NULL; 112 oop Universe::_out_of_memory_error_class_metaspace = NULL; 113 oop Universe::_out_of_memory_error_array_size = NULL; 114 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 115 oop Universe::_out_of_memory_error_realloc_objects = NULL; 116 oop Universe::_out_of_memory_error_retry = NULL; 117 oop Universe::_delayed_stack_overflow_error_message = NULL; 118 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 119 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 120 bool Universe::_verify_in_progress = false; 121 long Universe::verify_flags = Universe::Verify_All; 122 oop Universe::_null_ptr_exception_instance = NULL; 123 oop Universe::_arithmetic_exception_instance = NULL; 124 oop Universe::_virtual_machine_error_instance = NULL; 125 oop Universe::_vm_exception = NULL; 126 oop Universe::_reference_pending_list = NULL; 127 128 Array<int>* Universe::_the_empty_int_array = NULL; 129 Array<u2>* Universe::_the_empty_short_array = NULL; 130 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 131 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL; 132 Array<Method*>* Universe::_the_empty_method_array = NULL; 133 134 // These variables are guarded by FullGCALot_lock. 135 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 136 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 137 138 // Heap 139 int Universe::_verify_count = 0; 140 141 // Oop verification (see MacroAssembler::verify_oop) 142 uintptr_t Universe::_verify_oop_mask = 0; 143 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 144 145 int Universe::_base_vtable_size = 0; 146 bool Universe::_bootstrapping = false; 147 bool Universe::_module_initialized = false; 148 bool Universe::_fully_initialized = false; 149 150 size_t Universe::_heap_capacity_at_last_gc; 151 size_t Universe::_heap_used_at_last_gc = 0; 152 153 CollectedHeap* Universe::_collectedHeap = NULL; 154 155 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 156 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 157 address Universe::_narrow_ptrs_base; 158 uint64_t Universe::_narrow_klass_range = (uint64_t(max_juint)+1); 159 160 void Universe::basic_type_classes_do(void f(Klass*)) { 161 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 162 f(_typeArrayKlassObjs[i]); 163 } 164 } 165 166 void Universe::basic_type_classes_do(KlassClosure *closure) { 167 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 168 closure->do_klass(_typeArrayKlassObjs[i]); 169 } 170 } 171 172 void Universe::oops_do(OopClosure* f) { 173 174 f->do_oop((oop*) &_int_mirror); 175 f->do_oop((oop*) &_float_mirror); 176 f->do_oop((oop*) &_double_mirror); 177 f->do_oop((oop*) &_byte_mirror); 178 f->do_oop((oop*) &_bool_mirror); 179 f->do_oop((oop*) &_char_mirror); 180 f->do_oop((oop*) &_long_mirror); 181 f->do_oop((oop*) &_short_mirror); 182 f->do_oop((oop*) &_void_mirror); 183 184 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 185 f->do_oop((oop*) &_mirrors[i]); 186 } 187 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 188 189 f->do_oop((oop*)&_the_empty_class_klass_array); 190 f->do_oop((oop*)&_the_null_sentinel); 191 f->do_oop((oop*)&_the_null_string); 192 f->do_oop((oop*)&_the_min_jint_string); 193 f->do_oop((oop*)&_out_of_memory_error_java_heap); 194 f->do_oop((oop*)&_out_of_memory_error_metaspace); 195 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 196 f->do_oop((oop*)&_out_of_memory_error_array_size); 197 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 198 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 199 f->do_oop((oop*)&_out_of_memory_error_retry); 200 f->do_oop((oop*)&_delayed_stack_overflow_error_message); 201 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 202 f->do_oop((oop*)&_null_ptr_exception_instance); 203 f->do_oop((oop*)&_arithmetic_exception_instance); 204 f->do_oop((oop*)&_virtual_machine_error_instance); 205 f->do_oop((oop*)&_main_thread_group); 206 f->do_oop((oop*)&_system_thread_group); 207 f->do_oop((oop*)&_vm_exception); 208 f->do_oop((oop*)&_reference_pending_list); 209 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 210 } 211 212 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 213 it->push(&_klass); 214 } 215 216 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 217 for (int i = 0; i < T_LONG+1; i++) { 218 it->push(&_typeArrayKlassObjs[i]); 219 } 220 it->push(&_objectArrayKlassObj); 221 222 it->push(&_the_empty_int_array); 223 it->push(&_the_empty_short_array); 224 it->push(&_the_empty_klass_array); 225 it->push(&_the_empty_instance_klass_array); 226 it->push(&_the_empty_method_array); 227 it->push(&_the_array_interfaces_array); 228 229 _finalizer_register_cache->metaspace_pointers_do(it); 230 _loader_addClass_cache->metaspace_pointers_do(it); 231 _pd_implies_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 // The mirrors are NULL if MetaspaceShared::is_heap_object_archiving_allowed 246 // is false. 247 f->do_oop(&_int_mirror); 248 f->do_oop(&_float_mirror); 249 f->do_oop(&_double_mirror); 250 f->do_oop(&_byte_mirror); 251 f->do_oop(&_bool_mirror); 252 f->do_oop(&_char_mirror); 253 f->do_oop(&_long_mirror); 254 f->do_oop(&_short_mirror); 255 f->do_oop(&_void_mirror); 256 #endif 257 258 f->do_ptr((void**)&_the_array_interfaces_array); 259 f->do_ptr((void**)&_the_empty_int_array); 260 f->do_ptr((void**)&_the_empty_short_array); 261 f->do_ptr((void**)&_the_empty_method_array); 262 f->do_ptr((void**)&_the_empty_klass_array); 263 f->do_ptr((void**)&_the_empty_instance_klass_array); 264 _finalizer_register_cache->serialize(f); 265 _loader_addClass_cache->serialize(f); 266 _pd_implies_cache->serialize(f); 267 _throw_illegal_access_error_cache->serialize(f); 268 _do_stack_walk_cache->serialize(f); 269 } 270 271 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 272 if (size < alignment || size % alignment != 0) { 273 vm_exit_during_initialization( 274 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 275 } 276 } 277 278 void initialize_basic_type_klass(Klass* k, TRAPS) { 279 Klass* ok = SystemDictionary::Object_klass(); 280 #if INCLUDE_CDS 281 if (UseSharedSpaces) { 282 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 283 assert(k->super() == ok, "u3"); 284 k->restore_unshareable_info(loader_data, Handle(), CHECK); 285 } else 286 #endif 287 { 288 k->initialize_supers(ok, NULL, CHECK); 289 } 290 k->append_to_sibling_list(); 291 } 292 293 void Universe::genesis(TRAPS) { 294 ResourceMark rm; 295 296 { FlagSetting fs(_bootstrapping, true); 297 298 { MutexLocker mc(Compile_lock); 299 300 java_lang_Class::allocate_fixup_lists(); 301 302 // determine base vtable size; without that we cannot create the array klasses 303 compute_base_vtable_size(); 304 305 if (!UseSharedSpaces) { 306 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 307 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 308 } 309 310 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 311 312 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 313 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 314 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 315 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 316 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 317 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 318 } 319 } 320 321 vmSymbols::initialize(CHECK); 322 323 SystemDictionary::initialize(CHECK); 324 325 Klass* ok = SystemDictionary::Object_klass(); 326 327 _the_null_string = StringTable::intern("null", CHECK); 328 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 329 330 #if INCLUDE_CDS 331 if (UseSharedSpaces) { 332 // Verify shared interfaces array. 333 assert(_the_array_interfaces_array->at(0) == 334 SystemDictionary::Cloneable_klass(), "u3"); 335 assert(_the_array_interfaces_array->at(1) == 336 SystemDictionary::Serializable_klass(), "u3"); 337 } else 338 #endif 339 { 340 // Set up shared interfaces array. (Do this before supers are set up.) 341 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 342 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 343 } 344 345 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 346 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 347 initialize_basic_type_klass(floatArrayKlassObj(), CHECK); 348 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 349 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 350 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 351 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 352 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 353 } // end of core bootstrapping 354 355 { 356 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 357 _the_null_sentinel = tns(); 358 } 359 360 // Maybe this could be lifted up now that object array can be initialized 361 // during the bootstrapping. 362 363 // OLD 364 // Initialize _objectArrayKlass after core bootstraping to make 365 // sure the super class is set up properly for _objectArrayKlass. 366 // --- 367 // NEW 368 // Since some of the old system object arrays have been converted to 369 // ordinary object arrays, _objectArrayKlass will be loaded when 370 // SystemDictionary::initialize(CHECK); is run. See the extra check 371 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 372 _objectArrayKlassObj = InstanceKlass:: 373 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 374 // OLD 375 // Add the class to the class hierarchy manually to make sure that 376 // its vtable is initialized after core bootstrapping is completed. 377 // --- 378 // New 379 // Have already been initialized. 380 _objectArrayKlassObj->append_to_sibling_list(); 381 382 #ifdef ASSERT 383 if (FullGCALot) { 384 // Allocate an array of dummy objects. 385 // We'd like these to be at the bottom of the old generation, 386 // so that when we free one and then collect, 387 // (almost) the whole heap moves 388 // and we find out if we actually update all the oops correctly. 389 // But we can't allocate directly in the old generation, 390 // so we allocate wherever, and hope that the first collection 391 // moves these objects to the bottom of the old generation. 392 // We can allocate directly in the permanent generation, so we do. 393 int size; 394 if (UseConcMarkSweepGC) { 395 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate"); 396 size = FullGCALotDummies; 397 } else { 398 size = FullGCALotDummies * 2; 399 } 400 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 401 objArrayHandle dummy_array(THREAD, naked_array); 402 int i = 0; 403 while (i < size) { 404 // Allocate dummy in old generation 405 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 406 dummy_array->obj_at_put(i++, dummy); 407 } 408 { 409 // Only modify the global variable inside the mutex. 410 // If we had a race to here, the other dummy_array instances 411 // and their elements just get dropped on the floor, which is fine. 412 MutexLocker ml(FullGCALot_lock); 413 if (_fullgc_alot_dummy_array == NULL) { 414 _fullgc_alot_dummy_array = dummy_array(); 415 } 416 } 417 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 418 } 419 #endif 420 } 421 422 void Universe::initialize_basic_type_mirrors(TRAPS) { 423 #if INCLUDE_CDS_JAVA_HEAP 424 if (UseSharedSpaces && 425 MetaspaceShared::open_archive_heap_region_mapped() && 426 _int_mirror != NULL) { 427 assert(MetaspaceShared::is_heap_object_archiving_allowed(), "Sanity"); 428 assert(_float_mirror != NULL && _double_mirror != NULL && 429 _byte_mirror != NULL && _byte_mirror != NULL && 430 _bool_mirror != NULL && _char_mirror != NULL && 431 _long_mirror != NULL && _short_mirror != NULL && 432 _void_mirror != NULL, "Sanity"); 433 } else 434 #endif 435 { 436 _int_mirror = 437 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 438 _float_mirror = 439 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 440 _double_mirror = 441 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 442 _byte_mirror = 443 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 444 _bool_mirror = 445 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 446 _char_mirror = 447 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 448 _long_mirror = 449 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 450 _short_mirror = 451 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 452 _void_mirror = 453 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 454 } 455 456 _mirrors[T_INT] = _int_mirror; 457 _mirrors[T_FLOAT] = _float_mirror; 458 _mirrors[T_DOUBLE] = _double_mirror; 459 _mirrors[T_BYTE] = _byte_mirror; 460 _mirrors[T_BOOLEAN] = _bool_mirror; 461 _mirrors[T_CHAR] = _char_mirror; 462 _mirrors[T_LONG] = _long_mirror; 463 _mirrors[T_SHORT] = _short_mirror; 464 _mirrors[T_VOID] = _void_mirror; 465 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 466 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 467 } 468 469 void Universe::fixup_mirrors(TRAPS) { 470 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 471 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 472 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 473 // that the number of objects allocated at this point is very small. 474 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 475 HandleMark hm(THREAD); 476 477 if (!UseSharedSpaces) { 478 // Cache the start of the static fields 479 InstanceMirrorKlass::init_offset_of_static_fields(); 480 } 481 482 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 483 int list_length = list->length(); 484 for (int i = 0; i < list_length; i++) { 485 Klass* k = list->at(i); 486 assert(k->is_klass(), "List should only hold classes"); 487 EXCEPTION_MARK; 488 java_lang_Class::fixup_mirror(k, CATCH); 489 } 490 delete java_lang_Class::fixup_mirror_list(); 491 java_lang_Class::set_fixup_mirror_list(NULL); 492 } 493 494 #define assert_pll_locked(test) \ 495 assert(Heap_lock->test(), "Reference pending list access requires lock") 496 497 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 498 499 oop Universe::reference_pending_list() { 500 if (Thread::current()->is_VM_thread()) { 501 assert_pll_locked(is_locked); 502 } else { 503 assert_pll_ownership(); 504 } 505 return _reference_pending_list; 506 } 507 508 void Universe::set_reference_pending_list(oop list) { 509 assert_pll_ownership(); 510 _reference_pending_list = list; 511 } 512 513 bool Universe::has_reference_pending_list() { 514 assert_pll_ownership(); 515 return _reference_pending_list != NULL; 516 } 517 518 oop Universe::swap_reference_pending_list(oop list) { 519 assert_pll_locked(is_locked); 520 return Atomic::xchg(list, &_reference_pending_list); 521 } 522 523 #undef assert_pll_locked 524 #undef assert_pll_ownership 525 526 // initialize_vtable could cause gc if 527 // 1) we specified true to initialize_vtable and 528 // 2) this ran after gc was enabled 529 // In case those ever change we use handles for oops 530 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) { 531 // init vtable of k and all subclasses 532 ko->vtable().initialize_vtable(false, CHECK); 533 if (ko->is_instance_klass()) { 534 for (Klass* sk = ko->subklass(); 535 sk != NULL; 536 sk = sk->next_sibling()) { 537 reinitialize_vtable_of(sk, CHECK); 538 } 539 } 540 } 541 542 543 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) { 544 k->itable().initialize_itable(false, CHECK); 545 } 546 547 548 void Universe::reinitialize_itables(TRAPS) { 549 MutexLocker mcld(ClassLoaderDataGraph_lock); 550 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK); 551 } 552 553 554 bool Universe::on_page_boundary(void* addr) { 555 return is_aligned(addr, os::vm_page_size()); 556 } 557 558 559 bool Universe::should_fill_in_stack_trace(Handle throwable) { 560 // never attempt to fill in the stack trace of preallocated errors that do not have 561 // backtrace. These errors are kept alive forever and may be "re-used" when all 562 // preallocated errors with backtrace have been consumed. Also need to avoid 563 // a potential loop which could happen if an out of memory occurs when attempting 564 // to allocate the backtrace. 565 return ((!oopDesc::equals(throwable(), Universe::_out_of_memory_error_java_heap)) && 566 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_metaspace)) && 567 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_class_metaspace)) && 568 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_array_size)) && 569 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_gc_overhead_limit)) && 570 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_realloc_objects)) && 571 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_retry))); 572 } 573 574 575 oop Universe::gen_out_of_memory_error(oop default_err) { 576 // generate an out of memory error: 577 // - if there is a preallocated error and stack traces are available 578 // (j.l.Throwable is initialized), then return the preallocated 579 // error with a filled in stack trace, and with the message 580 // provided by the default error. 581 // - otherwise, return the default error, without a stack trace. 582 int next; 583 if ((_preallocated_out_of_memory_error_avail_count > 0) && 584 SystemDictionary::Throwable_klass()->is_initialized()) { 585 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 586 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 587 } else { 588 next = -1; 589 } 590 if (next < 0) { 591 // all preallocated errors have been used. 592 // return default 593 return default_err; 594 } else { 595 Thread* THREAD = Thread::current(); 596 Handle default_err_h(THREAD, default_err); 597 // get the error object at the slot and set set it to NULL so that the 598 // array isn't keeping it alive anymore. 599 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next)); 600 assert(exc() != NULL, "slot has been used already"); 601 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 602 603 // use the message from the default error 604 oop msg = java_lang_Throwable::message(default_err_h()); 605 assert(msg != NULL, "no message"); 606 java_lang_Throwable::set_message(exc(), msg); 607 608 // populate the stack trace and return it. 609 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 610 return exc(); 611 } 612 } 613 614 intptr_t Universe::_non_oop_bits = 0; 615 616 void* Universe::non_oop_word() { 617 // Neither the high bits nor the low bits of this value is allowed 618 // to look like (respectively) the high or low bits of a real oop. 619 // 620 // High and low are CPU-specific notions, but low always includes 621 // the low-order bit. Since oops are always aligned at least mod 4, 622 // setting the low-order bit will ensure that the low half of the 623 // word will never look like that of a real oop. 624 // 625 // Using the OS-supplied non-memory-address word (usually 0 or -1) 626 // will take care of the high bits, however many there are. 627 628 if (_non_oop_bits == 0) { 629 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 630 } 631 632 return (void*)_non_oop_bits; 633 } 634 635 jint universe_init() { 636 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 637 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 638 "LogHeapWordSize is incorrect."); 639 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 640 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 641 "oop size is not not a multiple of HeapWord size"); 642 643 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 644 645 JavaClasses::compute_hard_coded_offsets(); 646 647 jint status = Universe::initialize_heap(); 648 if (status != JNI_OK) { 649 return status; 650 } 651 652 SystemDictionary::initialize_oop_storage(); 653 654 Metaspace::global_initialize(); 655 656 // Initialize performance counters for metaspaces 657 MetaspaceCounters::initialize_performance_counters(); 658 CompressedClassSpaceCounters::initialize_performance_counters(); 659 660 AOTLoader::universe_init(); 661 662 // Checks 'AfterMemoryInit' constraints. 663 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) { 664 return JNI_EINVAL; 665 } 666 667 // Create memory for metadata. Must be after initializing heap for 668 // DumpSharedSpaces. 669 ClassLoaderData::init_null_class_loader_data(); 670 671 // We have a heap so create the Method* caches before 672 // Metaspace::initialize_shared_spaces() tries to populate them. 673 Universe::_finalizer_register_cache = new LatestMethodCache(); 674 Universe::_loader_addClass_cache = new LatestMethodCache(); 675 Universe::_pd_implies_cache = new LatestMethodCache(); 676 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 677 Universe::_do_stack_walk_cache = new LatestMethodCache(); 678 679 #if INCLUDE_CDS 680 if (UseSharedSpaces) { 681 // Read the data structures supporting the shared spaces (shared 682 // system dictionary, symbol table, etc.). After that, access to 683 // the file (other than the mapped regions) is no longer needed, and 684 // the file is closed. Closing the file does not affect the 685 // currently mapped regions. 686 MetaspaceShared::initialize_shared_spaces(); 687 StringTable::create_table(); 688 } else 689 #endif 690 { 691 SymbolTable::create_table(); 692 StringTable::create_table(); 693 694 #if INCLUDE_CDS 695 if (DumpSharedSpaces) { 696 MetaspaceShared::prepare_for_dumping(); 697 } 698 #endif 699 } 700 if (strlen(VerifySubSet) > 0) { 701 Universe::initialize_verify_flags(); 702 } 703 704 ResolvedMethodTable::create_table(); 705 706 return JNI_OK; 707 } 708 709 CollectedHeap* Universe::create_heap() { 710 assert(_collectedHeap == NULL, "Heap already created"); 711 return GCConfig::arguments()->create_heap(); 712 } 713 714 // Choose the heap base address and oop encoding mode 715 // when compressed oops are used: 716 // Unscaled - Use 32-bits oops without encoding when 717 // NarrowOopHeapBaseMin + heap_size < 4Gb 718 // ZeroBased - Use zero based compressed oops with encoding when 719 // NarrowOopHeapBaseMin + heap_size < 32Gb 720 // HeapBased - Use compressed oops with heap base + encoding. 721 722 jint Universe::initialize_heap() { 723 _collectedHeap = create_heap(); 724 jint status = _collectedHeap->initialize(); 725 if (status != JNI_OK) { 726 return status; 727 } 728 log_info(gc)("Using %s", _collectedHeap->name()); 729 730 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 731 732 #ifdef _LP64 733 if (UseCompressedOops) { 734 // Subtract a page because something can get allocated at heap base. 735 // This also makes implicit null checking work, because the 736 // memory+1 page below heap_base needs to cause a signal. 737 // See needs_explicit_null_check. 738 // Only set the heap base for compressed oops because it indicates 739 // compressed oops for pstack code. 740 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 741 // Didn't reserve heap below 4Gb. Must shift. 742 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 743 } 744 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 745 // Did reserve heap below 32Gb. Can use base == 0; 746 Universe::set_narrow_oop_base(0); 747 } 748 AOTLoader::set_narrow_oop_shift(); 749 750 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 751 752 LogTarget(Info, gc, heap, coops) lt; 753 if (lt.is_enabled()) { 754 ResourceMark rm; 755 LogStream ls(lt); 756 Universe::print_compressed_oops_mode(&ls); 757 } 758 759 // Tell tests in which mode we run. 760 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 761 narrow_oop_mode_to_string(narrow_oop_mode()), 762 false)); 763 } 764 // Universe::narrow_oop_base() is one page below the heap. 765 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 766 os::vm_page_size()) || 767 Universe::narrow_oop_base() == NULL, "invalid value"); 768 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 769 Universe::narrow_oop_shift() == 0, "invalid value"); 770 #endif 771 772 // We will never reach the CATCH below since Exceptions::_throw will cause 773 // the VM to exit if an exception is thrown during initialization 774 775 if (UseTLAB) { 776 assert(Universe::heap()->supports_tlab_allocation(), 777 "Should support thread-local allocation buffers"); 778 ThreadLocalAllocBuffer::startup_initialization(); 779 } 780 return JNI_OK; 781 } 782 783 void Universe::print_compressed_oops_mode(outputStream* st) { 784 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 785 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 786 787 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 788 789 if (Universe::narrow_oop_base() != 0) { 790 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 791 } 792 793 if (Universe::narrow_oop_shift() != 0) { 794 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 795 } 796 797 if (!Universe::narrow_oop_use_implicit_null_checks()) { 798 st->print(", no protected page in front of the heap"); 799 } 800 st->cr(); 801 } 802 803 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 804 805 assert(alignment <= Arguments::conservative_max_heap_alignment(), 806 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 807 alignment, Arguments::conservative_max_heap_alignment()); 808 809 size_t total_reserved = align_up(heap_size, alignment); 810 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 811 "heap size is too big for compressed oops"); 812 813 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size()); 814 assert(!UseLargePages 815 || UseParallelGC 816 || use_large_pages, "Wrong alignment to use large pages"); 817 818 // Now create the space. 819 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt); 820 821 if (total_rs.is_reserved()) { 822 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 823 "must be exactly of required size and alignment"); 824 // We are good. 825 826 if (UseCompressedOops) { 827 // Universe::initialize_heap() will reset this to NULL if unscaled 828 // or zero-based narrow oops are actually used. 829 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 830 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 831 } 832 833 if (AllocateHeapAt != NULL) { 834 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 835 } 836 return total_rs; 837 } 838 839 vm_exit_during_initialization( 840 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 841 total_reserved/K)); 842 843 // satisfy compiler 844 ShouldNotReachHere(); 845 return ReservedHeapSpace(0, 0, false); 846 } 847 848 849 // It's the caller's responsibility to ensure glitch-freedom 850 // (if required). 851 void Universe::update_heap_info_at_gc() { 852 _heap_capacity_at_last_gc = heap()->capacity(); 853 _heap_used_at_last_gc = heap()->used(); 854 } 855 856 857 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 858 switch (mode) { 859 case UnscaledNarrowOop: 860 return "32-bit"; 861 case ZeroBasedNarrowOop: 862 return "Zero based"; 863 case DisjointBaseNarrowOop: 864 return "Non-zero disjoint base"; 865 case HeapBasedNarrowOop: 866 return "Non-zero based"; 867 default: 868 ShouldNotReachHere(); 869 return ""; 870 } 871 } 872 873 874 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 875 if (narrow_oop_base_disjoint()) { 876 return DisjointBaseNarrowOop; 877 } 878 879 if (narrow_oop_base() != 0) { 880 return HeapBasedNarrowOop; 881 } 882 883 if (narrow_oop_shift() != 0) { 884 return ZeroBasedNarrowOop; 885 } 886 887 return UnscaledNarrowOop; 888 } 889 890 void initialize_known_method(LatestMethodCache* method_cache, 891 InstanceKlass* ik, 892 const char* method, 893 Symbol* signature, 894 bool is_static, TRAPS) 895 { 896 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK); 897 Method* m = NULL; 898 // The klass must be linked before looking up the method. 899 if (!ik->link_class_or_fail(THREAD) || 900 ((m = ik->find_method(name, signature)) == NULL) || 901 is_static != m->is_static()) { 902 ResourceMark rm(THREAD); 903 // NoSuchMethodException doesn't actually work because it tries to run the 904 // <init> function before java_lang_Class is linked. Print error and exit. 905 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 906 ik->name()->as_C_string(), method)); 907 } 908 method_cache->init(ik, m); 909 } 910 911 void Universe::initialize_known_methods(TRAPS) { 912 // Set up static method for registering finalizers 913 initialize_known_method(_finalizer_register_cache, 914 SystemDictionary::Finalizer_klass(), 915 "register", 916 vmSymbols::object_void_signature(), true, CHECK); 917 918 initialize_known_method(_throw_illegal_access_error_cache, 919 SystemDictionary::internal_Unsafe_klass(), 920 "throwIllegalAccessError", 921 vmSymbols::void_method_signature(), true, CHECK); 922 923 // Set up method for registering loaded classes in class loader vector 924 initialize_known_method(_loader_addClass_cache, 925 SystemDictionary::ClassLoader_klass(), 926 "addClass", 927 vmSymbols::class_void_signature(), false, CHECK); 928 929 // Set up method for checking protection domain 930 initialize_known_method(_pd_implies_cache, 931 SystemDictionary::ProtectionDomain_klass(), 932 "impliesCreateAccessControlContext", 933 vmSymbols::void_boolean_signature(), false, CHECK); 934 935 // Set up method for stack walking 936 initialize_known_method(_do_stack_walk_cache, 937 SystemDictionary::AbstractStackWalker_klass(), 938 "doStackWalk", 939 vmSymbols::doStackWalk_signature(), false, CHECK); 940 } 941 942 void universe2_init() { 943 EXCEPTION_MARK; 944 Universe::genesis(CATCH); 945 } 946 947 // Set after initialization of the module runtime, call_initModuleRuntime 948 void universe_post_module_init() { 949 Universe::_module_initialized = true; 950 } 951 952 bool universe_post_init() { 953 assert(!is_init_completed(), "Error: initialization not yet completed!"); 954 Universe::_fully_initialized = true; 955 EXCEPTION_MARK; 956 { ResourceMark rm; 957 Interpreter::initialize(); // needed for interpreter entry points 958 if (!UseSharedSpaces) { 959 HandleMark hm(THREAD); 960 Klass* ok = SystemDictionary::Object_klass(); 961 Universe::reinitialize_vtable_of(ok, CHECK_false); 962 Universe::reinitialize_itables(CHECK_false); 963 } 964 } 965 966 HandleMark hm(THREAD); 967 // Setup preallocated empty java.lang.Class array 968 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 969 970 // Setup preallocated OutOfMemoryError errors 971 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 972 InstanceKlass* ik = InstanceKlass::cast(k); 973 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false); 974 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false); 975 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false); 976 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false); 977 Universe::_out_of_memory_error_gc_overhead_limit = 978 ik->allocate_instance(CHECK_false); 979 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false); 980 Universe::_out_of_memory_error_retry = ik->allocate_instance(CHECK_false); 981 982 // Setup preallocated cause message for delayed StackOverflowError 983 if (StackReservedPages > 0) { 984 Universe::_delayed_stack_overflow_error_message = 985 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 986 } 987 988 // Setup preallocated NullPointerException 989 // (this is currently used for a cheap & dirty solution in compiler exception handling) 990 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 991 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 992 // Setup preallocated ArithmeticException 993 // (this is currently used for a cheap & dirty solution in compiler exception handling) 994 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 995 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 996 // Virtual Machine Error for when we get into a situation we can't resolve 997 k = SystemDictionary::resolve_or_fail( 998 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 999 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1000 if (!linked) { 1001 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1002 return false; // initialization failed 1003 } 1004 Universe::_virtual_machine_error_instance = 1005 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1006 1007 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1008 1009 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1010 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1011 1012 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 1013 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1014 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 1015 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1016 1017 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1018 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1019 1020 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1021 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1022 1023 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 1024 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 1025 1026 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK_false); 1027 java_lang_Throwable::set_message(Universe::_out_of_memory_error_retry, msg()); 1028 1029 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1030 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1031 1032 // Setup the array of errors that have preallocated backtrace 1033 k = Universe::_out_of_memory_error_java_heap->klass(); 1034 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1035 ik = InstanceKlass::cast(k); 1036 1037 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1038 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false); 1039 for (int i=0; i<len; i++) { 1040 oop err = ik->allocate_instance(CHECK_false); 1041 Handle err_h = Handle(THREAD, err); 1042 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1043 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1044 } 1045 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1046 1047 Universe::initialize_known_methods(CHECK_false); 1048 1049 // This needs to be done before the first scavenge/gc, since 1050 // it's an input to soft ref clearing policy. 1051 { 1052 MutexLocker x(Heap_lock); 1053 Universe::update_heap_info_at_gc(); 1054 } 1055 1056 // ("weak") refs processing infrastructure initialization 1057 Universe::heap()->post_initialize(); 1058 1059 MemoryService::add_metaspace_memory_pools(); 1060 1061 MemoryService::set_universe_heap(Universe::heap()); 1062 #if INCLUDE_CDS 1063 MetaspaceShared::post_initialize(CHECK_false); 1064 #endif 1065 return true; 1066 } 1067 1068 1069 void Universe::compute_base_vtable_size() { 1070 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1071 } 1072 1073 void Universe::print_on(outputStream* st) { 1074 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1075 st->print_cr("Heap"); 1076 heap()->print_on(st); 1077 } 1078 1079 void Universe::print_heap_at_SIGBREAK() { 1080 if (PrintHeapAtSIGBREAK) { 1081 print_on(tty); 1082 tty->cr(); 1083 tty->flush(); 1084 } 1085 } 1086 1087 void Universe::print_heap_before_gc() { 1088 LogTarget(Debug, gc, heap) lt; 1089 if (lt.is_enabled()) { 1090 LogStream ls(lt); 1091 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1092 ResourceMark rm; 1093 heap()->print_on(&ls); 1094 } 1095 } 1096 1097 void Universe::print_heap_after_gc() { 1098 LogTarget(Debug, gc, heap) lt; 1099 if (lt.is_enabled()) { 1100 LogStream ls(lt); 1101 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1102 ResourceMark rm; 1103 heap()->print_on(&ls); 1104 } 1105 } 1106 1107 void Universe::initialize_verify_flags() { 1108 verify_flags = 0; 1109 const char delimiter[] = " ,"; 1110 1111 size_t length = strlen(VerifySubSet); 1112 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1113 strncpy(subset_list, VerifySubSet, length + 1); 1114 1115 char* token = strtok(subset_list, delimiter); 1116 while (token != NULL) { 1117 if (strcmp(token, "threads") == 0) { 1118 verify_flags |= Verify_Threads; 1119 } else if (strcmp(token, "heap") == 0) { 1120 verify_flags |= Verify_Heap; 1121 } else if (strcmp(token, "symbol_table") == 0) { 1122 verify_flags |= Verify_SymbolTable; 1123 } else if (strcmp(token, "string_table") == 0) { 1124 verify_flags |= Verify_StringTable; 1125 } else if (strcmp(token, "codecache") == 0) { 1126 verify_flags |= Verify_CodeCache; 1127 } else if (strcmp(token, "dictionary") == 0) { 1128 verify_flags |= Verify_SystemDictionary; 1129 } else if (strcmp(token, "classloader_data_graph") == 0) { 1130 verify_flags |= Verify_ClassLoaderDataGraph; 1131 } else if (strcmp(token, "metaspace") == 0) { 1132 verify_flags |= Verify_MetaspaceUtils; 1133 } else if (strcmp(token, "jni_handles") == 0) { 1134 verify_flags |= Verify_JNIHandles; 1135 } else if (strcmp(token, "codecache_oops") == 0) { 1136 verify_flags |= Verify_CodeCacheOops; 1137 } else { 1138 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1139 } 1140 token = strtok(NULL, delimiter); 1141 } 1142 FREE_C_HEAP_ARRAY(char, subset_list); 1143 } 1144 1145 bool Universe::should_verify_subset(uint subset) { 1146 if (verify_flags & subset) { 1147 return true; 1148 } 1149 return false; 1150 } 1151 1152 void Universe::verify(VerifyOption option, const char* prefix) { 1153 // The use of _verify_in_progress is a temporary work around for 1154 // 6320749. Don't bother with a creating a class to set and clear 1155 // it since it is only used in this method and the control flow is 1156 // straight forward. 1157 _verify_in_progress = true; 1158 1159 COMPILER2_PRESENT( 1160 assert(!DerivedPointerTable::is_active(), 1161 "DPT should not be active during verification " 1162 "(of thread stacks below)"); 1163 ) 1164 1165 ResourceMark rm; 1166 HandleMark hm; // Handles created during verification can be zapped 1167 _verify_count++; 1168 1169 FormatBuffer<> title("Verifying %s", prefix); 1170 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1171 if (should_verify_subset(Verify_Threads)) { 1172 log_debug(gc, verify)("Threads"); 1173 Threads::verify(); 1174 } 1175 if (should_verify_subset(Verify_Heap)) { 1176 log_debug(gc, verify)("Heap"); 1177 heap()->verify(option); 1178 } 1179 if (should_verify_subset(Verify_SymbolTable)) { 1180 log_debug(gc, verify)("SymbolTable"); 1181 SymbolTable::verify(); 1182 } 1183 if (should_verify_subset(Verify_StringTable)) { 1184 log_debug(gc, verify)("StringTable"); 1185 StringTable::verify(); 1186 } 1187 if (should_verify_subset(Verify_CodeCache)) { 1188 { 1189 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1190 log_debug(gc, verify)("CodeCache"); 1191 CodeCache::verify(); 1192 } 1193 } 1194 if (should_verify_subset(Verify_SystemDictionary)) { 1195 log_debug(gc, verify)("SystemDictionary"); 1196 SystemDictionary::verify(); 1197 } 1198 #ifndef PRODUCT 1199 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1200 log_debug(gc, verify)("ClassLoaderDataGraph"); 1201 ClassLoaderDataGraph::verify(); 1202 } 1203 #endif 1204 if (should_verify_subset(Verify_MetaspaceUtils)) { 1205 log_debug(gc, verify)("MetaspaceUtils"); 1206 MetaspaceUtils::verify_free_chunks(); 1207 } 1208 if (should_verify_subset(Verify_JNIHandles)) { 1209 log_debug(gc, verify)("JNIHandles"); 1210 JNIHandles::verify(); 1211 } 1212 if (should_verify_subset(Verify_CodeCacheOops)) { 1213 log_debug(gc, verify)("CodeCache Oops"); 1214 CodeCache::verify_oops(); 1215 } 1216 1217 _verify_in_progress = false; 1218 } 1219 1220 1221 #ifndef PRODUCT 1222 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1223 assert(low_boundary < high_boundary, "bad interval"); 1224 1225 // decide which low-order bits we require to be clear: 1226 size_t alignSize = MinObjAlignmentInBytes; 1227 size_t min_object_size = CollectedHeap::min_fill_size(); 1228 1229 // make an inclusive limit: 1230 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1231 uintptr_t min = (uintptr_t)low_boundary; 1232 assert(min < max, "bad interval"); 1233 uintptr_t diff = max ^ min; 1234 1235 // throw away enough low-order bits to make the diff vanish 1236 uintptr_t mask = (uintptr_t)(-1); 1237 while ((mask & diff) != 0) 1238 mask <<= 1; 1239 uintptr_t bits = (min & mask); 1240 assert(bits == (max & mask), "correct mask"); 1241 // check an intermediate value between min and max, just to make sure: 1242 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1243 1244 // require address alignment, too: 1245 mask |= (alignSize - 1); 1246 1247 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1248 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1249 } 1250 _verify_oop_mask = mask; 1251 _verify_oop_bits = bits; 1252 } 1253 1254 // Oop verification (see MacroAssembler::verify_oop) 1255 1256 uintptr_t Universe::verify_oop_mask() { 1257 MemRegion m = heap()->reserved_region(); 1258 calculate_verify_data(m.start(), m.end()); 1259 return _verify_oop_mask; 1260 } 1261 1262 uintptr_t Universe::verify_oop_bits() { 1263 MemRegion m = heap()->reserved_region(); 1264 calculate_verify_data(m.start(), m.end()); 1265 return _verify_oop_bits; 1266 } 1267 1268 uintptr_t Universe::verify_mark_mask() { 1269 return markOopDesc::lock_mask_in_place; 1270 } 1271 1272 uintptr_t Universe::verify_mark_bits() { 1273 intptr_t mask = verify_mark_mask(); 1274 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1275 assert((bits & ~mask) == 0, "no stray header bits"); 1276 return bits; 1277 } 1278 #endif // PRODUCT 1279 1280 1281 void Universe::compute_verify_oop_data() { 1282 verify_oop_mask(); 1283 verify_oop_bits(); 1284 verify_mark_mask(); 1285 verify_mark_bits(); 1286 } 1287 1288 1289 void LatestMethodCache::init(Klass* k, Method* m) { 1290 if (!UseSharedSpaces) { 1291 _klass = k; 1292 } 1293 #ifndef PRODUCT 1294 else { 1295 // sharing initilization should have already set up _klass 1296 assert(_klass != NULL, "just checking"); 1297 } 1298 #endif 1299 1300 _method_idnum = m->method_idnum(); 1301 assert(_method_idnum >= 0, "sanity check"); 1302 } 1303 1304 1305 Method* LatestMethodCache::get_method() { 1306 if (klass() == NULL) return NULL; 1307 InstanceKlass* ik = InstanceKlass::cast(klass()); 1308 Method* m = ik->method_with_idnum(method_idnum()); 1309 assert(m != NULL, "sanity check"); 1310 return m; 1311 } 1312 1313 1314 #ifdef ASSERT 1315 // Release dummy object(s) at bottom of heap 1316 bool Universe::release_fullgc_alot_dummy() { 1317 MutexLocker ml(FullGCALot_lock); 1318 if (_fullgc_alot_dummy_array != NULL) { 1319 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1320 // No more dummies to release, release entire array instead 1321 _fullgc_alot_dummy_array = NULL; 1322 return false; 1323 } 1324 if (!UseConcMarkSweepGC) { 1325 // Release dummy at bottom of old generation 1326 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1327 } 1328 // Release dummy at bottom of permanent generation 1329 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1330 } 1331 return true; 1332 } 1333 1334 #endif // ASSERT