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::_boolArrayKlassObj = NULL; 87 Klass* Universe::_byteArrayKlassObj = NULL; 88 Klass* Universe::_charArrayKlassObj = NULL; 89 Klass* Universe::_intArrayKlassObj = NULL; 90 Klass* Universe::_shortArrayKlassObj = NULL; 91 Klass* Universe::_longArrayKlassObj = NULL; 92 Klass* Universe::_singleArrayKlassObj = NULL; 93 Klass* Universe::_doubleArrayKlassObj = NULL; 94 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 95 Klass* Universe::_objectArrayKlassObj = NULL; 96 oop Universe::_int_mirror = NULL; 97 oop Universe::_float_mirror = NULL; 98 oop Universe::_double_mirror = NULL; 99 oop Universe::_byte_mirror = NULL; 100 oop Universe::_bool_mirror = NULL; 101 oop Universe::_char_mirror = NULL; 102 oop Universe::_long_mirror = NULL; 103 oop Universe::_short_mirror = NULL; 104 oop Universe::_void_mirror = NULL; 105 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 106 oop Universe::_main_thread_group = NULL; 107 oop Universe::_system_thread_group = NULL; 108 objArrayOop Universe::_the_empty_class_klass_array = NULL; 109 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 110 oop Universe::_the_null_sentinel = NULL; 111 oop Universe::_the_null_string = NULL; 112 oop Universe::_the_min_jint_string = NULL; 113 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 114 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 115 LatestMethodCache* Universe::_pd_implies_cache = NULL; 116 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 117 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 118 oop Universe::_out_of_memory_error_java_heap = NULL; 119 oop Universe::_out_of_memory_error_metaspace = NULL; 120 oop Universe::_out_of_memory_error_class_metaspace = NULL; 121 oop Universe::_out_of_memory_error_array_size = NULL; 122 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 123 oop Universe::_out_of_memory_error_realloc_objects = NULL; 124 oop Universe::_delayed_stack_overflow_error_message = NULL; 125 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 126 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 127 bool Universe::_verify_in_progress = false; 128 long Universe::verify_flags = Universe::Verify_All; 129 oop Universe::_null_ptr_exception_instance = NULL; 130 oop Universe::_arithmetic_exception_instance = NULL; 131 oop Universe::_virtual_machine_error_instance = NULL; 132 oop Universe::_vm_exception = NULL; 133 oop Universe::_reference_pending_list = NULL; 134 135 Array<int>* Universe::_the_empty_int_array = NULL; 136 Array<u2>* Universe::_the_empty_short_array = NULL; 137 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 138 Array<Method*>* Universe::_the_empty_method_array = NULL; 139 140 // These variables are guarded by FullGCALot_lock. 141 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 142 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 143 144 // Heap 145 int Universe::_verify_count = 0; 146 147 // Oop verification (see MacroAssembler::verify_oop) 148 uintptr_t Universe::_verify_oop_mask = 0; 149 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 150 151 int Universe::_base_vtable_size = 0; 152 bool Universe::_bootstrapping = false; 153 bool Universe::_module_initialized = false; 154 bool Universe::_fully_initialized = false; 155 156 size_t Universe::_heap_capacity_at_last_gc; 157 size_t Universe::_heap_used_at_last_gc = 0; 158 159 CollectedHeap* Universe::_collectedHeap = NULL; 160 161 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 162 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 163 address Universe::_narrow_ptrs_base; 164 uint64_t Universe::_narrow_klass_range = (uint64_t(max_juint)+1); 165 166 void Universe::basic_type_classes_do(void f(Klass*)) { 167 f(boolArrayKlassObj()); 168 f(byteArrayKlassObj()); 169 f(charArrayKlassObj()); 170 f(intArrayKlassObj()); 171 f(shortArrayKlassObj()); 172 f(longArrayKlassObj()); 173 f(singleArrayKlassObj()); 174 f(doubleArrayKlassObj()); 175 } 176 177 void Universe::oops_do(OopClosure* f, bool do_all) { 178 179 f->do_oop((oop*) &_int_mirror); 180 f->do_oop((oop*) &_float_mirror); 181 f->do_oop((oop*) &_double_mirror); 182 f->do_oop((oop*) &_byte_mirror); 183 f->do_oop((oop*) &_bool_mirror); 184 f->do_oop((oop*) &_char_mirror); 185 f->do_oop((oop*) &_long_mirror); 186 f->do_oop((oop*) &_short_mirror); 187 f->do_oop((oop*) &_void_mirror); 188 189 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 190 f->do_oop((oop*) &_mirrors[i]); 191 } 192 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 193 194 f->do_oop((oop*)&_the_empty_class_klass_array); 195 f->do_oop((oop*)&_the_null_sentinel); 196 f->do_oop((oop*)&_the_null_string); 197 f->do_oop((oop*)&_the_min_jint_string); 198 f->do_oop((oop*)&_out_of_memory_error_java_heap); 199 f->do_oop((oop*)&_out_of_memory_error_metaspace); 200 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 201 f->do_oop((oop*)&_out_of_memory_error_array_size); 202 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 203 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 204 f->do_oop((oop*)&_delayed_stack_overflow_error_message); 205 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 206 f->do_oop((oop*)&_null_ptr_exception_instance); 207 f->do_oop((oop*)&_arithmetic_exception_instance); 208 f->do_oop((oop*)&_virtual_machine_error_instance); 209 f->do_oop((oop*)&_main_thread_group); 210 f->do_oop((oop*)&_system_thread_group); 211 f->do_oop((oop*)&_vm_exception); 212 f->do_oop((oop*)&_reference_pending_list); 213 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 214 } 215 216 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 217 it->push(&_klass); 218 } 219 220 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 221 it->push(&_boolArrayKlassObj); 222 it->push(&_byteArrayKlassObj); 223 it->push(&_charArrayKlassObj); 224 it->push(&_intArrayKlassObj); 225 it->push(&_shortArrayKlassObj); 226 it->push(&_longArrayKlassObj); 227 it->push(&_singleArrayKlassObj); 228 it->push(&_doubleArrayKlassObj); 229 for (int i = 0; i < T_VOID+1; i++) { 230 it->push(&_typeArrayKlassObjs[i]); 231 } 232 it->push(&_objectArrayKlassObj); 233 234 it->push(&_the_empty_int_array); 235 it->push(&_the_empty_short_array); 236 it->push(&_the_empty_klass_array); 237 it->push(&_the_empty_method_array); 238 it->push(&_the_array_interfaces_array); 239 240 _finalizer_register_cache->metaspace_pointers_do(it); 241 _loader_addClass_cache->metaspace_pointers_do(it); 242 _pd_implies_cache->metaspace_pointers_do(it); 243 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 244 _do_stack_walk_cache->metaspace_pointers_do(it); 245 } 246 247 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive 248 void Universe::serialize(SerializeClosure* f, bool do_all) { 249 250 f->do_ptr((void**)&_boolArrayKlassObj); 251 f->do_ptr((void**)&_byteArrayKlassObj); 252 f->do_ptr((void**)&_charArrayKlassObj); 253 f->do_ptr((void**)&_intArrayKlassObj); 254 f->do_ptr((void**)&_shortArrayKlassObj); 255 f->do_ptr((void**)&_longArrayKlassObj); 256 f->do_ptr((void**)&_singleArrayKlassObj); 257 f->do_ptr((void**)&_doubleArrayKlassObj); 258 f->do_ptr((void**)&_objectArrayKlassObj); 259 260 { 261 for (int i = 0; i < T_VOID+1; i++) { 262 if (_typeArrayKlassObjs[i] != NULL) { 263 assert(i >= T_BOOLEAN, "checking"); 264 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 265 } else if (do_all) { 266 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 267 } 268 } 269 } 270 271 #if INCLUDE_CDS_JAVA_HEAP 272 // The mirrors are NULL if MetaspaceShared::is_heap_object_archiving_allowed 273 // is false. 274 f->do_oop(&_int_mirror); 275 f->do_oop(&_float_mirror); 276 f->do_oop(&_double_mirror); 277 f->do_oop(&_byte_mirror); 278 f->do_oop(&_bool_mirror); 279 f->do_oop(&_char_mirror); 280 f->do_oop(&_long_mirror); 281 f->do_oop(&_short_mirror); 282 f->do_oop(&_void_mirror); 283 #endif 284 285 f->do_ptr((void**)&_the_array_interfaces_array); 286 f->do_ptr((void**)&_the_empty_int_array); 287 f->do_ptr((void**)&_the_empty_short_array); 288 f->do_ptr((void**)&_the_empty_method_array); 289 f->do_ptr((void**)&_the_empty_klass_array); 290 _finalizer_register_cache->serialize(f); 291 _loader_addClass_cache->serialize(f); 292 _pd_implies_cache->serialize(f); 293 _throw_illegal_access_error_cache->serialize(f); 294 _do_stack_walk_cache->serialize(f); 295 } 296 297 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 298 if (size < alignment || size % alignment != 0) { 299 vm_exit_during_initialization( 300 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 301 } 302 } 303 304 void initialize_basic_type_klass(Klass* k, TRAPS) { 305 Klass* ok = SystemDictionary::Object_klass(); 306 #if INCLUDE_CDS 307 if (UseSharedSpaces) { 308 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 309 assert(k->super() == ok, "u3"); 310 k->restore_unshareable_info(loader_data, Handle(), CHECK); 311 } else 312 #endif 313 { 314 k->initialize_supers(ok, NULL, CHECK); 315 } 316 k->append_to_sibling_list(); 317 } 318 319 void Universe::genesis(TRAPS) { 320 ResourceMark rm; 321 322 { FlagSetting fs(_bootstrapping, true); 323 324 { MutexLocker mc(Compile_lock); 325 326 java_lang_Class::allocate_fixup_lists(); 327 328 // determine base vtable size; without that we cannot create the array klasses 329 compute_base_vtable_size(); 330 331 if (!UseSharedSpaces) { 332 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 333 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 334 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 335 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 336 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 337 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 338 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 339 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 340 341 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 342 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 343 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 344 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 345 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 346 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 347 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 348 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 349 350 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 351 352 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 353 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 354 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 355 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 356 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 357 } 358 } 359 360 vmSymbols::initialize(CHECK); 361 362 SystemDictionary::initialize(CHECK); 363 364 Klass* ok = SystemDictionary::Object_klass(); 365 366 _the_null_string = StringTable::intern("null", CHECK); 367 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 368 369 #if INCLUDE_CDS 370 if (UseSharedSpaces) { 371 // Verify shared interfaces array. 372 assert(_the_array_interfaces_array->at(0) == 373 SystemDictionary::Cloneable_klass(), "u3"); 374 assert(_the_array_interfaces_array->at(1) == 375 SystemDictionary::Serializable_klass(), "u3"); 376 MetaspaceShared::fixup_mapped_heap_regions(); 377 } else 378 #endif 379 { 380 // Set up shared interfaces array. (Do this before supers are set up.) 381 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 382 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 383 } 384 385 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 386 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 387 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 388 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 389 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 390 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 391 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 392 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 393 } // end of core bootstrapping 394 395 { 396 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 397 _the_null_sentinel = tns(); 398 } 399 400 // Maybe this could be lifted up now that object array can be initialized 401 // during the bootstrapping. 402 403 // OLD 404 // Initialize _objectArrayKlass after core bootstraping to make 405 // sure the super class is set up properly for _objectArrayKlass. 406 // --- 407 // NEW 408 // Since some of the old system object arrays have been converted to 409 // ordinary object arrays, _objectArrayKlass will be loaded when 410 // SystemDictionary::initialize(CHECK); is run. See the extra check 411 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 412 _objectArrayKlassObj = InstanceKlass:: 413 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 414 // OLD 415 // Add the class to the class hierarchy manually to make sure that 416 // its vtable is initialized after core bootstrapping is completed. 417 // --- 418 // New 419 // Have already been initialized. 420 _objectArrayKlassObj->append_to_sibling_list(); 421 422 #ifdef ASSERT 423 if (FullGCALot) { 424 // Allocate an array of dummy objects. 425 // We'd like these to be at the bottom of the old generation, 426 // so that when we free one and then collect, 427 // (almost) the whole heap moves 428 // and we find out if we actually update all the oops correctly. 429 // But we can't allocate directly in the old generation, 430 // so we allocate wherever, and hope that the first collection 431 // moves these objects to the bottom of the old generation. 432 // We can allocate directly in the permanent generation, so we do. 433 int size; 434 if (UseConcMarkSweepGC) { 435 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate"); 436 size = FullGCALotDummies; 437 } else { 438 size = FullGCALotDummies * 2; 439 } 440 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 441 objArrayHandle dummy_array(THREAD, naked_array); 442 int i = 0; 443 while (i < size) { 444 // Allocate dummy in old generation 445 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 446 dummy_array->obj_at_put(i++, dummy); 447 } 448 { 449 // Only modify the global variable inside the mutex. 450 // If we had a race to here, the other dummy_array instances 451 // and their elements just get dropped on the floor, which is fine. 452 MutexLocker ml(FullGCALot_lock); 453 if (_fullgc_alot_dummy_array == NULL) { 454 _fullgc_alot_dummy_array = dummy_array(); 455 } 456 } 457 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 458 } 459 #endif 460 } 461 462 void Universe::initialize_basic_type_mirrors(TRAPS) { 463 #if INCLUDE_CDS_JAVA_HEAP 464 if (UseSharedSpaces && 465 MetaspaceShared::open_archive_heap_region_mapped() && 466 _int_mirror != NULL) { 467 assert(MetaspaceShared::is_heap_object_archiving_allowed(), "Sanity"); 468 assert(_float_mirror != NULL && _double_mirror != NULL && 469 _byte_mirror != NULL && _byte_mirror != NULL && 470 _bool_mirror != NULL && _char_mirror != NULL && 471 _long_mirror != NULL && _short_mirror != NULL && 472 _void_mirror != NULL, "Sanity"); 473 } else 474 #endif 475 { 476 _int_mirror = 477 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 478 _float_mirror = 479 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 480 _double_mirror = 481 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 482 _byte_mirror = 483 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 484 _bool_mirror = 485 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 486 _char_mirror = 487 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 488 _long_mirror = 489 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 490 _short_mirror = 491 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 492 _void_mirror = 493 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 494 } 495 496 _mirrors[T_INT] = _int_mirror; 497 _mirrors[T_FLOAT] = _float_mirror; 498 _mirrors[T_DOUBLE] = _double_mirror; 499 _mirrors[T_BYTE] = _byte_mirror; 500 _mirrors[T_BOOLEAN] = _bool_mirror; 501 _mirrors[T_CHAR] = _char_mirror; 502 _mirrors[T_LONG] = _long_mirror; 503 _mirrors[T_SHORT] = _short_mirror; 504 _mirrors[T_VOID] = _void_mirror; 505 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 506 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 507 } 508 509 void Universe::fixup_mirrors(TRAPS) { 510 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 511 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 512 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 513 // that the number of objects allocated at this point is very small. 514 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 515 HandleMark hm(THREAD); 516 517 if (!UseSharedSpaces) { 518 // Cache the start of the static fields 519 InstanceMirrorKlass::init_offset_of_static_fields(); 520 } 521 522 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 523 int list_length = list->length(); 524 for (int i = 0; i < list_length; i++) { 525 Klass* k = list->at(i); 526 assert(k->is_klass(), "List should only hold classes"); 527 EXCEPTION_MARK; 528 java_lang_Class::fixup_mirror(k, CATCH); 529 } 530 delete java_lang_Class::fixup_mirror_list(); 531 java_lang_Class::set_fixup_mirror_list(NULL); 532 } 533 534 #define assert_pll_locked(test) \ 535 assert(Heap_lock->test(), "Reference pending list access requires lock") 536 537 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 538 539 oop Universe::reference_pending_list() { 540 if (Thread::current()->is_VM_thread()) { 541 assert_pll_locked(is_locked); 542 } else { 543 assert_pll_ownership(); 544 } 545 return _reference_pending_list; 546 } 547 548 void Universe::set_reference_pending_list(oop list) { 549 assert_pll_ownership(); 550 _reference_pending_list = list; 551 } 552 553 bool Universe::has_reference_pending_list() { 554 assert_pll_ownership(); 555 return _reference_pending_list != NULL; 556 } 557 558 oop Universe::swap_reference_pending_list(oop list) { 559 assert_pll_locked(is_locked); 560 return Atomic::xchg(list, &_reference_pending_list); 561 } 562 563 #undef assert_pll_locked 564 #undef assert_pll_ownership 565 566 // initialize_vtable could cause gc if 567 // 1) we specified true to initialize_vtable and 568 // 2) this ran after gc was enabled 569 // In case those ever change we use handles for oops 570 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) { 571 // init vtable of k and all subclasses 572 ko->vtable().initialize_vtable(false, CHECK); 573 if (ko->is_instance_klass()) { 574 for (Klass* sk = ko->subklass(); 575 sk != NULL; 576 sk = sk->next_sibling()) { 577 reinitialize_vtable_of(sk, CHECK); 578 } 579 } 580 } 581 582 583 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) { 584 k->itable().initialize_itable(false, CHECK); 585 } 586 587 588 void Universe::reinitialize_itables(TRAPS) { 589 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK); 590 } 591 592 593 bool Universe::on_page_boundary(void* addr) { 594 return is_aligned(addr, os::vm_page_size()); 595 } 596 597 598 bool Universe::should_fill_in_stack_trace(Handle throwable) { 599 // never attempt to fill in the stack trace of preallocated errors that do not have 600 // backtrace. These errors are kept alive forever and may be "re-used" when all 601 // preallocated errors with backtrace have been consumed. Also need to avoid 602 // a potential loop which could happen if an out of memory occurs when attempting 603 // to allocate the backtrace. 604 return ((!oopDesc::equals(throwable(), Universe::_out_of_memory_error_java_heap)) && 605 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_metaspace)) && 606 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_class_metaspace)) && 607 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_array_size)) && 608 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_gc_overhead_limit)) && 609 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_realloc_objects))); 610 } 611 612 613 oop Universe::gen_out_of_memory_error(oop default_err) { 614 // generate an out of memory error: 615 // - if there is a preallocated error and stack traces are available 616 // (j.l.Throwable is initialized), then return the preallocated 617 // error with a filled in stack trace, and with the message 618 // provided by the default error. 619 // - otherwise, return the default error, without a stack trace. 620 int next; 621 if ((_preallocated_out_of_memory_error_avail_count > 0) && 622 SystemDictionary::Throwable_klass()->is_initialized()) { 623 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 624 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 625 } else { 626 next = -1; 627 } 628 if (next < 0) { 629 // all preallocated errors have been used. 630 // return default 631 return default_err; 632 } else { 633 Thread* THREAD = Thread::current(); 634 Handle default_err_h(THREAD, default_err); 635 // get the error object at the slot and set set it to NULL so that the 636 // array isn't keeping it alive anymore. 637 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next)); 638 assert(exc() != NULL, "slot has been used already"); 639 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 640 641 // use the message from the default error 642 oop msg = java_lang_Throwable::message(default_err_h()); 643 assert(msg != NULL, "no message"); 644 java_lang_Throwable::set_message(exc(), msg); 645 646 // populate the stack trace and return it. 647 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 648 return exc(); 649 } 650 } 651 652 intptr_t Universe::_non_oop_bits = 0; 653 654 void* Universe::non_oop_word() { 655 // Neither the high bits nor the low bits of this value is allowed 656 // to look like (respectively) the high or low bits of a real oop. 657 // 658 // High and low are CPU-specific notions, but low always includes 659 // the low-order bit. Since oops are always aligned at least mod 4, 660 // setting the low-order bit will ensure that the low half of the 661 // word will never look like that of a real oop. 662 // 663 // Using the OS-supplied non-memory-address word (usually 0 or -1) 664 // will take care of the high bits, however many there are. 665 666 if (_non_oop_bits == 0) { 667 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 668 } 669 670 return (void*)_non_oop_bits; 671 } 672 673 jint universe_init() { 674 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 675 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 676 "LogHeapWordSize is incorrect."); 677 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 678 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 679 "oop size is not not a multiple of HeapWord size"); 680 681 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 682 683 JavaClasses::compute_hard_coded_offsets(); 684 685 jint status = Universe::initialize_heap(); 686 if (status != JNI_OK) { 687 return status; 688 } 689 690 SystemDictionary::initialize_oop_storage(); 691 692 Metaspace::global_initialize(); 693 694 // Initialize performance counters for metaspaces 695 MetaspaceCounters::initialize_performance_counters(); 696 CompressedClassSpaceCounters::initialize_performance_counters(); 697 698 AOTLoader::universe_init(); 699 700 // Checks 'AfterMemoryInit' constraints. 701 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) { 702 return JNI_EINVAL; 703 } 704 705 // Create memory for metadata. Must be after initializing heap for 706 // DumpSharedSpaces. 707 ClassLoaderData::init_null_class_loader_data(); 708 709 // We have a heap so create the Method* caches before 710 // Metaspace::initialize_shared_spaces() tries to populate them. 711 Universe::_finalizer_register_cache = new LatestMethodCache(); 712 Universe::_loader_addClass_cache = new LatestMethodCache(); 713 Universe::_pd_implies_cache = new LatestMethodCache(); 714 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 715 Universe::_do_stack_walk_cache = new LatestMethodCache(); 716 717 #if INCLUDE_CDS 718 if (UseSharedSpaces) { 719 // Read the data structures supporting the shared spaces (shared 720 // system dictionary, symbol table, etc.). After that, access to 721 // the file (other than the mapped regions) is no longer needed, and 722 // the file is closed. Closing the file does not affect the 723 // currently mapped regions. 724 MetaspaceShared::initialize_shared_spaces(); 725 StringTable::create_table(); 726 } else 727 #endif 728 { 729 SymbolTable::create_table(); 730 StringTable::create_table(); 731 732 #if INCLUDE_CDS 733 if (DumpSharedSpaces) { 734 MetaspaceShared::prepare_for_dumping(); 735 } 736 #endif 737 } 738 if (strlen(VerifySubSet) > 0) { 739 Universe::initialize_verify_flags(); 740 } 741 742 ResolvedMethodTable::create_table(); 743 744 return JNI_OK; 745 } 746 747 CollectedHeap* Universe::create_heap() { 748 assert(_collectedHeap == NULL, "Heap already created"); 749 return GCConfig::arguments()->create_heap(); 750 } 751 752 // Choose the heap base address and oop encoding mode 753 // when compressed oops are used: 754 // Unscaled - Use 32-bits oops without encoding when 755 // NarrowOopHeapBaseMin + heap_size < 4Gb 756 // ZeroBased - Use zero based compressed oops with encoding when 757 // NarrowOopHeapBaseMin + heap_size < 32Gb 758 // HeapBased - Use compressed oops with heap base + encoding. 759 760 jint Universe::initialize_heap() { 761 _collectedHeap = create_heap(); 762 jint status = _collectedHeap->initialize(); 763 if (status != JNI_OK) { 764 return status; 765 } 766 log_info(gc)("Using %s", _collectedHeap->name()); 767 768 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 769 770 #ifdef _LP64 771 if (UseCompressedOops) { 772 // Subtract a page because something can get allocated at heap base. 773 // This also makes implicit null checking work, because the 774 // memory+1 page below heap_base needs to cause a signal. 775 // See needs_explicit_null_check. 776 // Only set the heap base for compressed oops because it indicates 777 // compressed oops for pstack code. 778 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 779 // Didn't reserve heap below 4Gb. Must shift. 780 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 781 } 782 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 783 // Did reserve heap below 32Gb. Can use base == 0; 784 Universe::set_narrow_oop_base(0); 785 } 786 AOTLoader::set_narrow_oop_shift(); 787 788 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 789 790 LogTarget(Info, gc, heap, coops) lt; 791 if (lt.is_enabled()) { 792 ResourceMark rm; 793 LogStream ls(lt); 794 Universe::print_compressed_oops_mode(&ls); 795 } 796 797 // Tell tests in which mode we run. 798 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 799 narrow_oop_mode_to_string(narrow_oop_mode()), 800 false)); 801 } 802 // Universe::narrow_oop_base() is one page below the heap. 803 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 804 os::vm_page_size()) || 805 Universe::narrow_oop_base() == NULL, "invalid value"); 806 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 807 Universe::narrow_oop_shift() == 0, "invalid value"); 808 #endif 809 810 // We will never reach the CATCH below since Exceptions::_throw will cause 811 // the VM to exit if an exception is thrown during initialization 812 813 if (UseTLAB) { 814 assert(Universe::heap()->supports_tlab_allocation(), 815 "Should support thread-local allocation buffers"); 816 ThreadLocalAllocBuffer::startup_initialization(); 817 } 818 return JNI_OK; 819 } 820 821 void Universe::print_compressed_oops_mode(outputStream* st) { 822 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 823 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 824 825 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 826 827 if (Universe::narrow_oop_base() != 0) { 828 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 829 } 830 831 if (Universe::narrow_oop_shift() != 0) { 832 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 833 } 834 835 if (!Universe::narrow_oop_use_implicit_null_checks()) { 836 st->print(", no protected page in front of the heap"); 837 } 838 st->cr(); 839 } 840 841 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 842 843 assert(alignment <= Arguments::conservative_max_heap_alignment(), 844 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 845 alignment, Arguments::conservative_max_heap_alignment()); 846 847 size_t total_reserved = align_up(heap_size, alignment); 848 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 849 "heap size is too big for compressed oops"); 850 851 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size()); 852 assert(!UseLargePages 853 || UseParallelGC 854 || use_large_pages, "Wrong alignment to use large pages"); 855 856 // Now create the space. 857 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt); 858 859 if (total_rs.is_reserved()) { 860 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 861 "must be exactly of required size and alignment"); 862 // We are good. 863 864 if (UseCompressedOops) { 865 // Universe::initialize_heap() will reset this to NULL if unscaled 866 // or zero-based narrow oops are actually used. 867 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 868 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 869 } 870 871 if (AllocateHeapAt != NULL) { 872 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 873 } 874 return total_rs; 875 } 876 877 vm_exit_during_initialization( 878 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 879 total_reserved/K)); 880 881 // satisfy compiler 882 ShouldNotReachHere(); 883 return ReservedHeapSpace(0, 0, false); 884 } 885 886 887 // It's the caller's responsibility to ensure glitch-freedom 888 // (if required). 889 void Universe::update_heap_info_at_gc() { 890 _heap_capacity_at_last_gc = heap()->capacity(); 891 _heap_used_at_last_gc = heap()->used(); 892 } 893 894 895 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 896 switch (mode) { 897 case UnscaledNarrowOop: 898 return "32-bit"; 899 case ZeroBasedNarrowOop: 900 return "Zero based"; 901 case DisjointBaseNarrowOop: 902 return "Non-zero disjoint base"; 903 case HeapBasedNarrowOop: 904 return "Non-zero based"; 905 default: 906 ShouldNotReachHere(); 907 return ""; 908 } 909 } 910 911 912 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 913 if (narrow_oop_base_disjoint()) { 914 return DisjointBaseNarrowOop; 915 } 916 917 if (narrow_oop_base() != 0) { 918 return HeapBasedNarrowOop; 919 } 920 921 if (narrow_oop_shift() != 0) { 922 return ZeroBasedNarrowOop; 923 } 924 925 return UnscaledNarrowOop; 926 } 927 928 void initialize_known_method(LatestMethodCache* method_cache, 929 InstanceKlass* ik, 930 const char* method, 931 Symbol* signature, 932 bool is_static, TRAPS) 933 { 934 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK); 935 Method* m = NULL; 936 // The klass must be linked before looking up the method. 937 if (!ik->link_class_or_fail(THREAD) || 938 ((m = ik->find_method(name, signature)) == NULL) || 939 is_static != m->is_static()) { 940 ResourceMark rm(THREAD); 941 // NoSuchMethodException doesn't actually work because it tries to run the 942 // <init> function before java_lang_Class is linked. Print error and exit. 943 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 944 ik->name()->as_C_string(), method)); 945 } 946 method_cache->init(ik, m); 947 } 948 949 void Universe::initialize_known_methods(TRAPS) { 950 // Set up static method for registering finalizers 951 initialize_known_method(_finalizer_register_cache, 952 SystemDictionary::Finalizer_klass(), 953 "register", 954 vmSymbols::object_void_signature(), true, CHECK); 955 956 initialize_known_method(_throw_illegal_access_error_cache, 957 SystemDictionary::internal_Unsafe_klass(), 958 "throwIllegalAccessError", 959 vmSymbols::void_method_signature(), true, CHECK); 960 961 // Set up method for registering loaded classes in class loader vector 962 initialize_known_method(_loader_addClass_cache, 963 SystemDictionary::ClassLoader_klass(), 964 "addClass", 965 vmSymbols::class_void_signature(), false, CHECK); 966 967 // Set up method for checking protection domain 968 initialize_known_method(_pd_implies_cache, 969 SystemDictionary::ProtectionDomain_klass(), 970 "impliesCreateAccessControlContext", 971 vmSymbols::void_boolean_signature(), false, CHECK); 972 973 // Set up method for stack walking 974 initialize_known_method(_do_stack_walk_cache, 975 SystemDictionary::AbstractStackWalker_klass(), 976 "doStackWalk", 977 vmSymbols::doStackWalk_signature(), false, CHECK); 978 } 979 980 void universe2_init() { 981 EXCEPTION_MARK; 982 Universe::genesis(CATCH); 983 } 984 985 // Set after initialization of the module runtime, call_initModuleRuntime 986 void universe_post_module_init() { 987 Universe::_module_initialized = true; 988 } 989 990 bool universe_post_init() { 991 assert(!is_init_completed(), "Error: initialization not yet completed!"); 992 Universe::_fully_initialized = true; 993 EXCEPTION_MARK; 994 { ResourceMark rm; 995 Interpreter::initialize(); // needed for interpreter entry points 996 if (!UseSharedSpaces) { 997 HandleMark hm(THREAD); 998 Klass* ok = SystemDictionary::Object_klass(); 999 Universe::reinitialize_vtable_of(ok, CHECK_false); 1000 Universe::reinitialize_itables(CHECK_false); 1001 } 1002 } 1003 1004 HandleMark hm(THREAD); 1005 // Setup preallocated empty java.lang.Class array 1006 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 1007 1008 // Setup preallocated OutOfMemoryError errors 1009 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 1010 InstanceKlass* ik = InstanceKlass::cast(k); 1011 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false); 1012 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false); 1013 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false); 1014 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false); 1015 Universe::_out_of_memory_error_gc_overhead_limit = 1016 ik->allocate_instance(CHECK_false); 1017 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false); 1018 1019 // Setup preallocated cause message for delayed StackOverflowError 1020 if (StackReservedPages > 0) { 1021 Universe::_delayed_stack_overflow_error_message = 1022 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1023 } 1024 1025 // Setup preallocated NullPointerException 1026 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1027 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1028 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1029 // Setup preallocated ArithmeticException 1030 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1031 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1032 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1033 // Virtual Machine Error for when we get into a situation we can't resolve 1034 k = SystemDictionary::resolve_or_fail( 1035 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1036 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1037 if (!linked) { 1038 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1039 return false; // initialization failed 1040 } 1041 Universe::_virtual_machine_error_instance = 1042 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1043 1044 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1045 1046 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1047 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1048 1049 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 1050 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1051 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 1052 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1053 1054 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1055 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1056 1057 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1058 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1059 1060 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 1061 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 1062 1063 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1064 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1065 1066 // Setup the array of errors that have preallocated backtrace 1067 k = Universe::_out_of_memory_error_java_heap->klass(); 1068 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1069 ik = InstanceKlass::cast(k); 1070 1071 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1072 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false); 1073 for (int i=0; i<len; i++) { 1074 oop err = ik->allocate_instance(CHECK_false); 1075 Handle err_h = Handle(THREAD, err); 1076 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1077 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1078 } 1079 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1080 1081 Universe::initialize_known_methods(CHECK_false); 1082 1083 // This needs to be done before the first scavenge/gc, since 1084 // it's an input to soft ref clearing policy. 1085 { 1086 MutexLocker x(Heap_lock); 1087 Universe::update_heap_info_at_gc(); 1088 } 1089 1090 // ("weak") refs processing infrastructure initialization 1091 Universe::heap()->post_initialize(); 1092 1093 MemoryService::add_metaspace_memory_pools(); 1094 1095 MemoryService::set_universe_heap(Universe::heap()); 1096 #if INCLUDE_CDS 1097 MetaspaceShared::post_initialize(CHECK_false); 1098 #endif 1099 return true; 1100 } 1101 1102 1103 void Universe::compute_base_vtable_size() { 1104 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1105 } 1106 1107 void Universe::print_on(outputStream* st) { 1108 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1109 st->print_cr("Heap"); 1110 heap()->print_on(st); 1111 } 1112 1113 void Universe::print_heap_at_SIGBREAK() { 1114 if (PrintHeapAtSIGBREAK) { 1115 print_on(tty); 1116 tty->cr(); 1117 tty->flush(); 1118 } 1119 } 1120 1121 void Universe::print_heap_before_gc() { 1122 LogTarget(Debug, gc, heap) lt; 1123 if (lt.is_enabled()) { 1124 LogStream ls(lt); 1125 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1126 ResourceMark rm; 1127 heap()->print_on(&ls); 1128 } 1129 } 1130 1131 void Universe::print_heap_after_gc() { 1132 LogTarget(Debug, gc, heap) lt; 1133 if (lt.is_enabled()) { 1134 LogStream ls(lt); 1135 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1136 ResourceMark rm; 1137 heap()->print_on(&ls); 1138 } 1139 } 1140 1141 void Universe::initialize_verify_flags() { 1142 verify_flags = 0; 1143 const char delimiter[] = " ,"; 1144 1145 size_t length = strlen(VerifySubSet); 1146 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1147 strncpy(subset_list, VerifySubSet, length + 1); 1148 1149 char* token = strtok(subset_list, delimiter); 1150 while (token != NULL) { 1151 if (strcmp(token, "threads") == 0) { 1152 verify_flags |= Verify_Threads; 1153 } else if (strcmp(token, "heap") == 0) { 1154 verify_flags |= Verify_Heap; 1155 } else if (strcmp(token, "symbol_table") == 0) { 1156 verify_flags |= Verify_SymbolTable; 1157 } else if (strcmp(token, "string_table") == 0) { 1158 verify_flags |= Verify_StringTable; 1159 } else if (strcmp(token, "codecache") == 0) { 1160 verify_flags |= Verify_CodeCache; 1161 } else if (strcmp(token, "dictionary") == 0) { 1162 verify_flags |= Verify_SystemDictionary; 1163 } else if (strcmp(token, "classloader_data_graph") == 0) { 1164 verify_flags |= Verify_ClassLoaderDataGraph; 1165 } else if (strcmp(token, "metaspace") == 0) { 1166 verify_flags |= Verify_MetaspaceUtils; 1167 } else if (strcmp(token, "jni_handles") == 0) { 1168 verify_flags |= Verify_JNIHandles; 1169 } else if (strcmp(token, "codecache_oops") == 0) { 1170 verify_flags |= Verify_CodeCacheOops; 1171 } else { 1172 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1173 } 1174 token = strtok(NULL, delimiter); 1175 } 1176 FREE_C_HEAP_ARRAY(char, subset_list); 1177 } 1178 1179 bool Universe::should_verify_subset(uint subset) { 1180 if (verify_flags & subset) { 1181 return true; 1182 } 1183 return false; 1184 } 1185 1186 void Universe::verify(VerifyOption option, const char* prefix) { 1187 // The use of _verify_in_progress is a temporary work around for 1188 // 6320749. Don't bother with a creating a class to set and clear 1189 // it since it is only used in this method and the control flow is 1190 // straight forward. 1191 _verify_in_progress = true; 1192 1193 COMPILER2_PRESENT( 1194 assert(!DerivedPointerTable::is_active(), 1195 "DPT should not be active during verification " 1196 "(of thread stacks below)"); 1197 ) 1198 1199 ResourceMark rm; 1200 HandleMark hm; // Handles created during verification can be zapped 1201 _verify_count++; 1202 1203 FormatBuffer<> title("Verifying %s", prefix); 1204 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1205 if (should_verify_subset(Verify_Threads)) { 1206 log_debug(gc, verify)("Threads"); 1207 Threads::verify(); 1208 } 1209 if (should_verify_subset(Verify_Heap)) { 1210 log_debug(gc, verify)("Heap"); 1211 heap()->verify(option); 1212 } 1213 if (should_verify_subset(Verify_SymbolTable)) { 1214 log_debug(gc, verify)("SymbolTable"); 1215 SymbolTable::verify(); 1216 } 1217 if (should_verify_subset(Verify_StringTable)) { 1218 log_debug(gc, verify)("StringTable"); 1219 StringTable::verify(); 1220 } 1221 if (should_verify_subset(Verify_CodeCache)) { 1222 { 1223 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1224 log_debug(gc, verify)("CodeCache"); 1225 CodeCache::verify(); 1226 } 1227 } 1228 if (should_verify_subset(Verify_SystemDictionary)) { 1229 log_debug(gc, verify)("SystemDictionary"); 1230 SystemDictionary::verify(); 1231 } 1232 #ifndef PRODUCT 1233 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1234 log_debug(gc, verify)("ClassLoaderDataGraph"); 1235 ClassLoaderDataGraph::verify(); 1236 } 1237 #endif 1238 if (should_verify_subset(Verify_MetaspaceUtils)) { 1239 log_debug(gc, verify)("MetaspaceUtils"); 1240 MetaspaceUtils::verify_free_chunks(); 1241 } 1242 if (should_verify_subset(Verify_JNIHandles)) { 1243 log_debug(gc, verify)("JNIHandles"); 1244 JNIHandles::verify(); 1245 } 1246 if (should_verify_subset(Verify_CodeCacheOops)) { 1247 log_debug(gc, verify)("CodeCache Oops"); 1248 CodeCache::verify_oops(); 1249 } 1250 1251 _verify_in_progress = false; 1252 } 1253 1254 1255 #ifndef PRODUCT 1256 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1257 assert(low_boundary < high_boundary, "bad interval"); 1258 1259 // decide which low-order bits we require to be clear: 1260 size_t alignSize = MinObjAlignmentInBytes; 1261 size_t min_object_size = CollectedHeap::min_fill_size(); 1262 1263 // make an inclusive limit: 1264 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1265 uintptr_t min = (uintptr_t)low_boundary; 1266 assert(min < max, "bad interval"); 1267 uintptr_t diff = max ^ min; 1268 1269 // throw away enough low-order bits to make the diff vanish 1270 uintptr_t mask = (uintptr_t)(-1); 1271 while ((mask & diff) != 0) 1272 mask <<= 1; 1273 uintptr_t bits = (min & mask); 1274 assert(bits == (max & mask), "correct mask"); 1275 // check an intermediate value between min and max, just to make sure: 1276 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1277 1278 // require address alignment, too: 1279 mask |= (alignSize - 1); 1280 1281 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1282 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1283 } 1284 _verify_oop_mask = mask; 1285 _verify_oop_bits = bits; 1286 } 1287 1288 // Oop verification (see MacroAssembler::verify_oop) 1289 1290 uintptr_t Universe::verify_oop_mask() { 1291 MemRegion m = heap()->reserved_region(); 1292 calculate_verify_data(m.start(), m.end()); 1293 return _verify_oop_mask; 1294 } 1295 1296 uintptr_t Universe::verify_oop_bits() { 1297 MemRegion m = heap()->reserved_region(); 1298 calculate_verify_data(m.start(), m.end()); 1299 return _verify_oop_bits; 1300 } 1301 1302 uintptr_t Universe::verify_mark_mask() { 1303 return markOopDesc::lock_mask_in_place; 1304 } 1305 1306 uintptr_t Universe::verify_mark_bits() { 1307 intptr_t mask = verify_mark_mask(); 1308 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1309 assert((bits & ~mask) == 0, "no stray header bits"); 1310 return bits; 1311 } 1312 #endif // PRODUCT 1313 1314 1315 void Universe::compute_verify_oop_data() { 1316 verify_oop_mask(); 1317 verify_oop_bits(); 1318 verify_mark_mask(); 1319 verify_mark_bits(); 1320 } 1321 1322 1323 void LatestMethodCache::init(Klass* k, Method* m) { 1324 if (!UseSharedSpaces) { 1325 _klass = k; 1326 } 1327 #ifndef PRODUCT 1328 else { 1329 // sharing initilization should have already set up _klass 1330 assert(_klass != NULL, "just checking"); 1331 } 1332 #endif 1333 1334 _method_idnum = m->method_idnum(); 1335 assert(_method_idnum >= 0, "sanity check"); 1336 } 1337 1338 1339 Method* LatestMethodCache::get_method() { 1340 if (klass() == NULL) return NULL; 1341 InstanceKlass* ik = InstanceKlass::cast(klass()); 1342 Method* m = ik->method_with_idnum(method_idnum()); 1343 assert(m != NULL, "sanity check"); 1344 return m; 1345 } 1346 1347 1348 #ifdef ASSERT 1349 // Release dummy object(s) at bottom of heap 1350 bool Universe::release_fullgc_alot_dummy() { 1351 MutexLocker ml(FullGCALot_lock); 1352 if (_fullgc_alot_dummy_array != NULL) { 1353 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1354 // No more dummies to release, release entire array instead 1355 _fullgc_alot_dummy_array = NULL; 1356 return false; 1357 } 1358 if (!UseConcMarkSweepGC) { 1359 // Release dummy at bottom of old generation 1360 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1361 } 1362 // Release dummy at bottom of permanent generation 1363 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1364 } 1365 return true; 1366 } 1367 1368 #endif // ASSERT