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/cardTableBarrierSet.hpp" 36 #include "gc/shared/collectedHeap.inline.hpp" 37 #include "gc/shared/gcArguments.hpp" 38 #include "gc/shared/gcConfig.hpp" 39 #include "gc/shared/gcLocker.hpp" 40 #include "gc/shared/generation.hpp" 41 #include "gc/shared/gcTraceTime.inline.hpp" 42 #include "gc/shared/space.hpp" 43 #include "interpreter/interpreter.hpp" 44 #include "logging/log.hpp" 45 #include "logging/logStream.hpp" 46 #include "memory/filemap.hpp" 47 #include "memory/metadataFactory.hpp" 48 #include "memory/metaspaceClosure.hpp" 49 #include "memory/metaspaceCounters.hpp" 50 #include "memory/metaspaceShared.hpp" 51 #include "memory/oopFactory.hpp" 52 #include "memory/resourceArea.hpp" 53 #include "memory/universe.hpp" 54 #include "memory/universe.hpp" 55 #include "oops/constantPool.hpp" 56 #include "oops/instanceClassLoaderKlass.hpp" 57 #include "oops/instanceKlass.hpp" 58 #include "oops/instanceMirrorKlass.hpp" 59 #include "oops/instanceRefKlass.hpp" 60 #include "oops/objArrayOop.inline.hpp" 61 #include "oops/oop.inline.hpp" 62 #include "oops/typeArrayKlass.hpp" 63 #include "prims/resolvedMethodTable.hpp" 64 #include "runtime/arguments.hpp" 65 #include "runtime/atomic.hpp" 66 #include "runtime/flags/flagSetting.hpp" 67 #include "runtime/flags/jvmFlagConstraintList.hpp" 68 #include "runtime/deoptimization.hpp" 69 #include "runtime/handles.inline.hpp" 70 #include "runtime/init.hpp" 71 #include "runtime/java.hpp" 72 #include "runtime/javaCalls.hpp" 73 #include "runtime/sharedRuntime.hpp" 74 #include "runtime/synchronizer.hpp" 75 #include "runtime/thread.inline.hpp" 76 #include "runtime/timerTrace.hpp" 77 #include "runtime/vm_operations.hpp" 78 #include "services/memoryService.hpp" 79 #include "utilities/align.hpp" 80 #include "utilities/copy.hpp" 81 #include "utilities/debug.hpp" 82 #include "utilities/events.hpp" 83 #include "utilities/formatBuffer.hpp" 84 #include "utilities/hashtable.inline.hpp" 85 #include "utilities/macros.hpp" 86 #include "utilities/ostream.hpp" 87 #include "utilities/preserveException.hpp" 88 #if INCLUDE_CDS 89 #include "classfile/sharedClassUtil.hpp" 90 #endif 91 92 // Known objects 93 Klass* Universe::_boolArrayKlassObj = NULL; 94 Klass* Universe::_byteArrayKlassObj = NULL; 95 Klass* Universe::_charArrayKlassObj = NULL; 96 Klass* Universe::_intArrayKlassObj = NULL; 97 Klass* Universe::_shortArrayKlassObj = NULL; 98 Klass* Universe::_longArrayKlassObj = NULL; 99 Klass* Universe::_singleArrayKlassObj = NULL; 100 Klass* Universe::_doubleArrayKlassObj = NULL; 101 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 102 Klass* Universe::_objectArrayKlassObj = NULL; 103 oop Universe::_int_mirror = NULL; 104 oop Universe::_float_mirror = NULL; 105 oop Universe::_double_mirror = NULL; 106 oop Universe::_byte_mirror = NULL; 107 oop Universe::_bool_mirror = NULL; 108 oop Universe::_char_mirror = NULL; 109 oop Universe::_long_mirror = NULL; 110 oop Universe::_short_mirror = NULL; 111 oop Universe::_void_mirror = NULL; 112 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 113 oop Universe::_main_thread_group = NULL; 114 oop Universe::_system_thread_group = NULL; 115 objArrayOop Universe::_the_empty_class_klass_array = NULL; 116 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 117 oop Universe::_the_null_sentinel = NULL; 118 oop Universe::_the_null_string = NULL; 119 oop Universe::_the_min_jint_string = NULL; 120 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 121 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 122 LatestMethodCache* Universe::_pd_implies_cache = NULL; 123 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 124 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 125 oop Universe::_out_of_memory_error_java_heap = NULL; 126 oop Universe::_out_of_memory_error_metaspace = NULL; 127 oop Universe::_out_of_memory_error_class_metaspace = NULL; 128 oop Universe::_out_of_memory_error_array_size = NULL; 129 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 130 oop Universe::_out_of_memory_error_realloc_objects = NULL; 131 oop Universe::_delayed_stack_overflow_error_message = NULL; 132 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 133 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 134 bool Universe::_verify_in_progress = false; 135 long Universe::verify_flags = Universe::Verify_All; 136 oop Universe::_null_ptr_exception_instance = NULL; 137 oop Universe::_arithmetic_exception_instance = NULL; 138 oop Universe::_virtual_machine_error_instance = NULL; 139 oop Universe::_vm_exception = NULL; 140 oop Universe::_reference_pending_list = NULL; 141 142 Array<int>* Universe::_the_empty_int_array = NULL; 143 Array<u2>* Universe::_the_empty_short_array = NULL; 144 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 145 Array<Method*>* Universe::_the_empty_method_array = NULL; 146 147 // These variables are guarded by FullGCALot_lock. 148 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 149 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 150 151 // Heap 152 int Universe::_verify_count = 0; 153 154 // Oop verification (see MacroAssembler::verify_oop) 155 uintptr_t Universe::_verify_oop_mask = 0; 156 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 157 158 int Universe::_base_vtable_size = 0; 159 bool Universe::_bootstrapping = false; 160 bool Universe::_module_initialized = false; 161 bool Universe::_fully_initialized = false; 162 163 size_t Universe::_heap_capacity_at_last_gc; 164 size_t Universe::_heap_used_at_last_gc = 0; 165 166 CollectedHeap* Universe::_collectedHeap = NULL; 167 168 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 169 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 170 address Universe::_narrow_ptrs_base; 171 uint64_t Universe::_narrow_klass_range = (uint64_t(max_juint)+1); 172 173 void Universe::basic_type_classes_do(void f(Klass*)) { 174 f(boolArrayKlassObj()); 175 f(byteArrayKlassObj()); 176 f(charArrayKlassObj()); 177 f(intArrayKlassObj()); 178 f(shortArrayKlassObj()); 179 f(longArrayKlassObj()); 180 f(singleArrayKlassObj()); 181 f(doubleArrayKlassObj()); 182 } 183 184 void Universe::oops_do(OopClosure* f, bool do_all) { 185 186 f->do_oop((oop*) &_int_mirror); 187 f->do_oop((oop*) &_float_mirror); 188 f->do_oop((oop*) &_double_mirror); 189 f->do_oop((oop*) &_byte_mirror); 190 f->do_oop((oop*) &_bool_mirror); 191 f->do_oop((oop*) &_char_mirror); 192 f->do_oop((oop*) &_long_mirror); 193 f->do_oop((oop*) &_short_mirror); 194 f->do_oop((oop*) &_void_mirror); 195 196 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 197 f->do_oop((oop*) &_mirrors[i]); 198 } 199 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 200 201 f->do_oop((oop*)&_the_empty_class_klass_array); 202 f->do_oop((oop*)&_the_null_sentinel); 203 f->do_oop((oop*)&_the_null_string); 204 f->do_oop((oop*)&_the_min_jint_string); 205 f->do_oop((oop*)&_out_of_memory_error_java_heap); 206 f->do_oop((oop*)&_out_of_memory_error_metaspace); 207 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 208 f->do_oop((oop*)&_out_of_memory_error_array_size); 209 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 210 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 211 f->do_oop((oop*)&_delayed_stack_overflow_error_message); 212 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 213 f->do_oop((oop*)&_null_ptr_exception_instance); 214 f->do_oop((oop*)&_arithmetic_exception_instance); 215 f->do_oop((oop*)&_virtual_machine_error_instance); 216 f->do_oop((oop*)&_main_thread_group); 217 f->do_oop((oop*)&_system_thread_group); 218 f->do_oop((oop*)&_vm_exception); 219 f->do_oop((oop*)&_reference_pending_list); 220 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 221 } 222 223 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 224 it->push(&_klass); 225 } 226 227 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 228 it->push(&_boolArrayKlassObj); 229 it->push(&_byteArrayKlassObj); 230 it->push(&_charArrayKlassObj); 231 it->push(&_intArrayKlassObj); 232 it->push(&_shortArrayKlassObj); 233 it->push(&_longArrayKlassObj); 234 it->push(&_singleArrayKlassObj); 235 it->push(&_doubleArrayKlassObj); 236 for (int i = 0; i < T_VOID+1; i++) { 237 it->push(&_typeArrayKlassObjs[i]); 238 } 239 it->push(&_objectArrayKlassObj); 240 241 it->push(&_the_empty_int_array); 242 it->push(&_the_empty_short_array); 243 it->push(&_the_empty_klass_array); 244 it->push(&_the_empty_method_array); 245 it->push(&_the_array_interfaces_array); 246 247 _finalizer_register_cache->metaspace_pointers_do(it); 248 _loader_addClass_cache->metaspace_pointers_do(it); 249 _pd_implies_cache->metaspace_pointers_do(it); 250 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 251 _do_stack_walk_cache->metaspace_pointers_do(it); 252 } 253 254 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive 255 void Universe::serialize(SerializeClosure* f, bool do_all) { 256 257 f->do_ptr((void**)&_boolArrayKlassObj); 258 f->do_ptr((void**)&_byteArrayKlassObj); 259 f->do_ptr((void**)&_charArrayKlassObj); 260 f->do_ptr((void**)&_intArrayKlassObj); 261 f->do_ptr((void**)&_shortArrayKlassObj); 262 f->do_ptr((void**)&_longArrayKlassObj); 263 f->do_ptr((void**)&_singleArrayKlassObj); 264 f->do_ptr((void**)&_doubleArrayKlassObj); 265 f->do_ptr((void**)&_objectArrayKlassObj); 266 267 { 268 for (int i = 0; i < T_VOID+1; i++) { 269 if (_typeArrayKlassObjs[i] != NULL) { 270 assert(i >= T_BOOLEAN, "checking"); 271 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 272 } else if (do_all) { 273 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 274 } 275 } 276 } 277 278 #if INCLUDE_CDS_JAVA_HEAP 279 // The mirrors are NULL if MetaspaceShared::is_heap_object_archiving_allowed 280 // is false. 281 f->do_oop(&_int_mirror); 282 f->do_oop(&_float_mirror); 283 f->do_oop(&_double_mirror); 284 f->do_oop(&_byte_mirror); 285 f->do_oop(&_bool_mirror); 286 f->do_oop(&_char_mirror); 287 f->do_oop(&_long_mirror); 288 f->do_oop(&_short_mirror); 289 f->do_oop(&_void_mirror); 290 #endif 291 292 f->do_ptr((void**)&_the_array_interfaces_array); 293 f->do_ptr((void**)&_the_empty_int_array); 294 f->do_ptr((void**)&_the_empty_short_array); 295 f->do_ptr((void**)&_the_empty_method_array); 296 f->do_ptr((void**)&_the_empty_klass_array); 297 _finalizer_register_cache->serialize(f); 298 _loader_addClass_cache->serialize(f); 299 _pd_implies_cache->serialize(f); 300 _throw_illegal_access_error_cache->serialize(f); 301 _do_stack_walk_cache->serialize(f); 302 } 303 304 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 305 if (size < alignment || size % alignment != 0) { 306 vm_exit_during_initialization( 307 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 308 } 309 } 310 311 void initialize_basic_type_klass(Klass* k, TRAPS) { 312 Klass* ok = SystemDictionary::Object_klass(); 313 #if INCLUDE_CDS 314 if (UseSharedSpaces) { 315 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 316 assert(k->super() == ok, "u3"); 317 k->restore_unshareable_info(loader_data, Handle(), CHECK); 318 } else 319 #endif 320 { 321 k->initialize_supers(ok, CHECK); 322 } 323 k->append_to_sibling_list(); 324 } 325 326 void Universe::genesis(TRAPS) { 327 ResourceMark rm; 328 329 { FlagSetting fs(_bootstrapping, true); 330 331 { MutexLocker mc(Compile_lock); 332 333 java_lang_Class::allocate_fixup_lists(); 334 335 // determine base vtable size; without that we cannot create the array klasses 336 compute_base_vtable_size(); 337 338 if (!UseSharedSpaces) { 339 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 340 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 341 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 342 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 343 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 344 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 345 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 346 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 347 348 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 349 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 350 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 351 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 352 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 353 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 354 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 355 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 356 357 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 358 359 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 360 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 361 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 362 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 363 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 364 } 365 } 366 367 vmSymbols::initialize(CHECK); 368 369 SystemDictionary::initialize(CHECK); 370 371 Klass* ok = SystemDictionary::Object_klass(); 372 373 _the_null_string = StringTable::intern("null", CHECK); 374 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 375 376 #if INCLUDE_CDS 377 if (UseSharedSpaces) { 378 // Verify shared interfaces array. 379 assert(_the_array_interfaces_array->at(0) == 380 SystemDictionary::Cloneable_klass(), "u3"); 381 assert(_the_array_interfaces_array->at(1) == 382 SystemDictionary::Serializable_klass(), "u3"); 383 MetaspaceShared::fixup_mapped_heap_regions(); 384 } else 385 #endif 386 { 387 // Set up shared interfaces array. (Do this before supers are set up.) 388 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 389 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 390 } 391 392 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 393 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 394 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 395 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 396 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 397 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 398 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 399 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 400 } // end of core bootstrapping 401 402 { 403 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 404 _the_null_sentinel = tns(); 405 } 406 407 // Maybe this could be lifted up now that object array can be initialized 408 // during the bootstrapping. 409 410 // OLD 411 // Initialize _objectArrayKlass after core bootstraping to make 412 // sure the super class is set up properly for _objectArrayKlass. 413 // --- 414 // NEW 415 // Since some of the old system object arrays have been converted to 416 // ordinary object arrays, _objectArrayKlass will be loaded when 417 // SystemDictionary::initialize(CHECK); is run. See the extra check 418 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 419 _objectArrayKlassObj = InstanceKlass:: 420 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 421 // OLD 422 // Add the class to the class hierarchy manually to make sure that 423 // its vtable is initialized after core bootstrapping is completed. 424 // --- 425 // New 426 // Have already been initialized. 427 _objectArrayKlassObj->append_to_sibling_list(); 428 429 #ifdef ASSERT 430 if (FullGCALot) { 431 // Allocate an array of dummy objects. 432 // We'd like these to be at the bottom of the old generation, 433 // so that when we free one and then collect, 434 // (almost) the whole heap moves 435 // and we find out if we actually update all the oops correctly. 436 // But we can't allocate directly in the old generation, 437 // so we allocate wherever, and hope that the first collection 438 // moves these objects to the bottom of the old generation. 439 // We can allocate directly in the permanent generation, so we do. 440 int size; 441 if (UseConcMarkSweepGC) { 442 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate"); 443 size = FullGCALotDummies; 444 } else { 445 size = FullGCALotDummies * 2; 446 } 447 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 448 objArrayHandle dummy_array(THREAD, naked_array); 449 int i = 0; 450 while (i < size) { 451 // Allocate dummy in old generation 452 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 453 dummy_array->obj_at_put(i++, dummy); 454 } 455 { 456 // Only modify the global variable inside the mutex. 457 // If we had a race to here, the other dummy_array instances 458 // and their elements just get dropped on the floor, which is fine. 459 MutexLocker ml(FullGCALot_lock); 460 if (_fullgc_alot_dummy_array == NULL) { 461 _fullgc_alot_dummy_array = dummy_array(); 462 } 463 } 464 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 465 } 466 #endif 467 } 468 469 void Universe::initialize_basic_type_mirrors(TRAPS) { 470 #if INCLUDE_CDS_JAVA_HEAP 471 if (UseSharedSpaces && 472 MetaspaceShared::open_archive_heap_region_mapped() && 473 _int_mirror != NULL) { 474 assert(MetaspaceShared::is_heap_object_archiving_allowed(), "Sanity"); 475 assert(_float_mirror != NULL && _double_mirror != NULL && 476 _byte_mirror != NULL && _byte_mirror != NULL && 477 _bool_mirror != NULL && _char_mirror != NULL && 478 _long_mirror != NULL && _short_mirror != NULL && 479 _void_mirror != NULL, "Sanity"); 480 } else 481 #endif 482 { 483 _int_mirror = 484 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 485 _float_mirror = 486 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 487 _double_mirror = 488 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 489 _byte_mirror = 490 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 491 _bool_mirror = 492 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 493 _char_mirror = 494 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 495 _long_mirror = 496 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 497 _short_mirror = 498 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 499 _void_mirror = 500 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 501 } 502 503 _mirrors[T_INT] = _int_mirror; 504 _mirrors[T_FLOAT] = _float_mirror; 505 _mirrors[T_DOUBLE] = _double_mirror; 506 _mirrors[T_BYTE] = _byte_mirror; 507 _mirrors[T_BOOLEAN] = _bool_mirror; 508 _mirrors[T_CHAR] = _char_mirror; 509 _mirrors[T_LONG] = _long_mirror; 510 _mirrors[T_SHORT] = _short_mirror; 511 _mirrors[T_VOID] = _void_mirror; 512 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 513 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 514 } 515 516 void Universe::fixup_mirrors(TRAPS) { 517 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 518 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 519 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 520 // that the number of objects allocated at this point is very small. 521 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 522 HandleMark hm(THREAD); 523 // Cache the start of the static fields 524 InstanceMirrorKlass::init_offset_of_static_fields(); 525 526 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 527 int list_length = list->length(); 528 for (int i = 0; i < list_length; i++) { 529 Klass* k = list->at(i); 530 assert(k->is_klass(), "List should only hold classes"); 531 EXCEPTION_MARK; 532 java_lang_Class::fixup_mirror(k, CATCH); 533 } 534 delete java_lang_Class::fixup_mirror_list(); 535 java_lang_Class::set_fixup_mirror_list(NULL); 536 } 537 538 #define assert_pll_locked(test) \ 539 assert(Heap_lock->test(), "Reference pending list access requires lock") 540 541 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 542 543 oop Universe::reference_pending_list() { 544 if (Thread::current()->is_VM_thread()) { 545 assert_pll_locked(is_locked); 546 } else { 547 assert_pll_ownership(); 548 } 549 return _reference_pending_list; 550 } 551 552 void Universe::set_reference_pending_list(oop list) { 553 assert_pll_ownership(); 554 _reference_pending_list = list; 555 } 556 557 bool Universe::has_reference_pending_list() { 558 assert_pll_ownership(); 559 return _reference_pending_list != NULL; 560 } 561 562 oop Universe::swap_reference_pending_list(oop list) { 563 assert_pll_locked(is_locked); 564 return Atomic::xchg(list, &_reference_pending_list); 565 } 566 567 #undef assert_pll_locked 568 #undef assert_pll_ownership 569 570 // initialize_vtable could cause gc if 571 // 1) we specified true to initialize_vtable and 572 // 2) this ran after gc was enabled 573 // In case those ever change we use handles for oops 574 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) { 575 // init vtable of k and all subclasses 576 ko->vtable().initialize_vtable(false, CHECK); 577 if (ko->is_instance_klass()) { 578 for (Klass* sk = ko->subklass(); 579 sk != NULL; 580 sk = sk->next_sibling()) { 581 reinitialize_vtable_of(sk, CHECK); 582 } 583 } 584 } 585 586 587 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) { 588 k->itable().initialize_itable(false, CHECK); 589 } 590 591 592 void Universe::reinitialize_itables(TRAPS) { 593 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK); 594 } 595 596 597 bool Universe::on_page_boundary(void* addr) { 598 return is_aligned(addr, os::vm_page_size()); 599 } 600 601 602 bool Universe::should_fill_in_stack_trace(Handle throwable) { 603 // never attempt to fill in the stack trace of preallocated errors that do not have 604 // backtrace. These errors are kept alive forever and may be "re-used" when all 605 // preallocated errors with backtrace have been consumed. Also need to avoid 606 // a potential loop which could happen if an out of memory occurs when attempting 607 // to allocate the backtrace. 608 return ((!oopDesc::equals(throwable(), Universe::_out_of_memory_error_java_heap)) && 609 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_metaspace)) && 610 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_class_metaspace)) && 611 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_array_size)) && 612 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_gc_overhead_limit)) && 613 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_realloc_objects))); 614 } 615 616 617 oop Universe::gen_out_of_memory_error(oop default_err) { 618 // generate an out of memory error: 619 // - if there is a preallocated error and stack traces are available 620 // (j.l.Throwable is initialized), then return the preallocated 621 // error with a filled in stack trace, and with the message 622 // provided by the default error. 623 // - otherwise, return the default error, without a stack trace. 624 int next; 625 if ((_preallocated_out_of_memory_error_avail_count > 0) && 626 SystemDictionary::Throwable_klass()->is_initialized()) { 627 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 628 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 629 } else { 630 next = -1; 631 } 632 if (next < 0) { 633 // all preallocated errors have been used. 634 // return default 635 return default_err; 636 } else { 637 Thread* THREAD = Thread::current(); 638 Handle default_err_h(THREAD, default_err); 639 // get the error object at the slot and set set it to NULL so that the 640 // array isn't keeping it alive anymore. 641 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next)); 642 assert(exc() != NULL, "slot has been used already"); 643 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 644 645 // use the message from the default error 646 oop msg = java_lang_Throwable::message(default_err_h()); 647 assert(msg != NULL, "no message"); 648 java_lang_Throwable::set_message(exc(), msg); 649 650 // populate the stack trace and return it. 651 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 652 return exc(); 653 } 654 } 655 656 intptr_t Universe::_non_oop_bits = 0; 657 658 void* Universe::non_oop_word() { 659 // Neither the high bits nor the low bits of this value is allowed 660 // to look like (respectively) the high or low bits of a real oop. 661 // 662 // High and low are CPU-specific notions, but low always includes 663 // the low-order bit. Since oops are always aligned at least mod 4, 664 // setting the low-order bit will ensure that the low half of the 665 // word will never look like that of a real oop. 666 // 667 // Using the OS-supplied non-memory-address word (usually 0 or -1) 668 // will take care of the high bits, however many there are. 669 670 if (_non_oop_bits == 0) { 671 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 672 } 673 674 return (void*)_non_oop_bits; 675 } 676 677 jint universe_init() { 678 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 679 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 680 "LogHeapWordSize is incorrect."); 681 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 682 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 683 "oop size is not not a multiple of HeapWord size"); 684 685 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 686 687 JavaClasses::compute_hard_coded_offsets(); 688 689 jint status = Universe::initialize_heap(); 690 if (status != JNI_OK) { 691 return status; 692 } 693 694 SystemDictionary::initialize_oop_storage(); 695 696 Metaspace::global_initialize(); 697 698 // Initialize performance counters for metaspaces 699 MetaspaceCounters::initialize_performance_counters(); 700 CompressedClassSpaceCounters::initialize_performance_counters(); 701 702 AOTLoader::universe_init(); 703 704 // Checks 'AfterMemoryInit' constraints. 705 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) { 706 return JNI_EINVAL; 707 } 708 709 // Create memory for metadata. Must be after initializing heap for 710 // DumpSharedSpaces. 711 ClassLoaderData::init_null_class_loader_data(); 712 713 // We have a heap so create the Method* caches before 714 // Metaspace::initialize_shared_spaces() tries to populate them. 715 Universe::_finalizer_register_cache = new LatestMethodCache(); 716 Universe::_loader_addClass_cache = new LatestMethodCache(); 717 Universe::_pd_implies_cache = new LatestMethodCache(); 718 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 719 Universe::_do_stack_walk_cache = new LatestMethodCache(); 720 721 #if INCLUDE_CDS 722 if (UseSharedSpaces) { 723 // Read the data structures supporting the shared spaces (shared 724 // system dictionary, symbol table, etc.). After that, access to 725 // the file (other than the mapped regions) is no longer needed, and 726 // the file is closed. Closing the file does not affect the 727 // currently mapped regions. 728 MetaspaceShared::initialize_shared_spaces(); 729 StringTable::create_table(); 730 } else 731 #endif 732 { 733 SymbolTable::create_table(); 734 StringTable::create_table(); 735 736 #if INCLUDE_CDS 737 if (DumpSharedSpaces) { 738 MetaspaceShared::prepare_for_dumping(); 739 } 740 #endif 741 } 742 if (strlen(VerifySubSet) > 0) { 743 Universe::initialize_verify_flags(); 744 } 745 746 ResolvedMethodTable::create_table(); 747 748 return JNI_OK; 749 } 750 751 CollectedHeap* Universe::create_heap() { 752 assert(_collectedHeap == NULL, "Heap already created"); 753 return GCConfig::arguments()->create_heap(); 754 } 755 756 // Choose the heap base address and oop encoding mode 757 // when compressed oops are used: 758 // Unscaled - Use 32-bits oops without encoding when 759 // NarrowOopHeapBaseMin + heap_size < 4Gb 760 // ZeroBased - Use zero based compressed oops with encoding when 761 // NarrowOopHeapBaseMin + heap_size < 32Gb 762 // HeapBased - Use compressed oops with heap base + encoding. 763 764 jint Universe::initialize_heap() { 765 _collectedHeap = create_heap(); 766 jint status = _collectedHeap->initialize(); 767 if (status != JNI_OK) { 768 return status; 769 } 770 log_info(gc)("Using %s", _collectedHeap->name()); 771 772 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 773 774 #ifdef _LP64 775 if (UseCompressedOops) { 776 // Subtract a page because something can get allocated at heap base. 777 // This also makes implicit null checking work, because the 778 // memory+1 page below heap_base needs to cause a signal. 779 // See needs_explicit_null_check. 780 // Only set the heap base for compressed oops because it indicates 781 // compressed oops for pstack code. 782 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 783 // Didn't reserve heap below 4Gb. Must shift. 784 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 785 } 786 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 787 // Did reserve heap below 32Gb. Can use base == 0; 788 Universe::set_narrow_oop_base(0); 789 } 790 AOTLoader::set_narrow_oop_shift(); 791 792 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 793 794 LogTarget(Info, gc, heap, coops) lt; 795 if (lt.is_enabled()) { 796 ResourceMark rm; 797 LogStream ls(lt); 798 Universe::print_compressed_oops_mode(&ls); 799 } 800 801 // Tell tests in which mode we run. 802 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 803 narrow_oop_mode_to_string(narrow_oop_mode()), 804 false)); 805 } 806 // Universe::narrow_oop_base() is one page below the heap. 807 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 808 os::vm_page_size()) || 809 Universe::narrow_oop_base() == NULL, "invalid value"); 810 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 811 Universe::narrow_oop_shift() == 0, "invalid value"); 812 #endif 813 814 // We will never reach the CATCH below since Exceptions::_throw will cause 815 // the VM to exit if an exception is thrown during initialization 816 817 if (UseTLAB) { 818 assert(Universe::heap()->supports_tlab_allocation(), 819 "Should support thread-local allocation buffers"); 820 ThreadLocalAllocBuffer::startup_initialization(); 821 } 822 return JNI_OK; 823 } 824 825 void Universe::print_compressed_oops_mode(outputStream* st) { 826 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 827 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 828 829 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 830 831 if (Universe::narrow_oop_base() != 0) { 832 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 833 } 834 835 if (Universe::narrow_oop_shift() != 0) { 836 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 837 } 838 839 if (!Universe::narrow_oop_use_implicit_null_checks()) { 840 st->print(", no protected page in front of the heap"); 841 } 842 st->cr(); 843 } 844 845 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 846 847 assert(alignment <= Arguments::conservative_max_heap_alignment(), 848 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 849 alignment, Arguments::conservative_max_heap_alignment()); 850 851 size_t total_reserved = align_up(heap_size, alignment); 852 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 853 "heap size is too big for compressed oops"); 854 855 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size()); 856 assert(!UseLargePages 857 || UseParallelGC 858 || use_large_pages, "Wrong alignment to use large pages"); 859 860 // Now create the space. 861 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt); 862 863 if (total_rs.is_reserved()) { 864 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 865 "must be exactly of required size and alignment"); 866 // We are good. 867 868 if (UseCompressedOops) { 869 // Universe::initialize_heap() will reset this to NULL if unscaled 870 // or zero-based narrow oops are actually used. 871 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 872 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 873 } 874 875 if (AllocateHeapAt != NULL) { 876 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 877 } 878 return total_rs; 879 } 880 881 vm_exit_during_initialization( 882 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 883 total_reserved/K)); 884 885 // satisfy compiler 886 ShouldNotReachHere(); 887 return ReservedHeapSpace(0, 0, false); 888 } 889 890 891 // It's the caller's responsibility to ensure glitch-freedom 892 // (if required). 893 void Universe::update_heap_info_at_gc() { 894 _heap_capacity_at_last_gc = heap()->capacity(); 895 _heap_used_at_last_gc = heap()->used(); 896 } 897 898 899 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 900 switch (mode) { 901 case UnscaledNarrowOop: 902 return "32-bit"; 903 case ZeroBasedNarrowOop: 904 return "Zero based"; 905 case DisjointBaseNarrowOop: 906 return "Non-zero disjoint base"; 907 case HeapBasedNarrowOop: 908 return "Non-zero based"; 909 default: 910 ShouldNotReachHere(); 911 return ""; 912 } 913 } 914 915 916 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 917 if (narrow_oop_base_disjoint()) { 918 return DisjointBaseNarrowOop; 919 } 920 921 if (narrow_oop_base() != 0) { 922 return HeapBasedNarrowOop; 923 } 924 925 if (narrow_oop_shift() != 0) { 926 return ZeroBasedNarrowOop; 927 } 928 929 return UnscaledNarrowOop; 930 } 931 932 void initialize_known_method(LatestMethodCache* method_cache, 933 InstanceKlass* ik, 934 const char* method, 935 Symbol* signature, 936 bool is_static, TRAPS) 937 { 938 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK); 939 Method* m = NULL; 940 // The klass must be linked before looking up the method. 941 if (!ik->link_class_or_fail(THREAD) || 942 ((m = ik->find_method(name, signature)) == NULL) || 943 is_static != m->is_static()) { 944 ResourceMark rm(THREAD); 945 // NoSuchMethodException doesn't actually work because it tries to run the 946 // <init> function before java_lang_Class is linked. Print error and exit. 947 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 948 ik->name()->as_C_string(), method)); 949 } 950 method_cache->init(ik, m); 951 } 952 953 void Universe::initialize_known_methods(TRAPS) { 954 // Set up static method for registering finalizers 955 initialize_known_method(_finalizer_register_cache, 956 SystemDictionary::Finalizer_klass(), 957 "register", 958 vmSymbols::object_void_signature(), true, CHECK); 959 960 initialize_known_method(_throw_illegal_access_error_cache, 961 SystemDictionary::internal_Unsafe_klass(), 962 "throwIllegalAccessError", 963 vmSymbols::void_method_signature(), true, CHECK); 964 965 // Set up method for registering loaded classes in class loader vector 966 initialize_known_method(_loader_addClass_cache, 967 SystemDictionary::ClassLoader_klass(), 968 "addClass", 969 vmSymbols::class_void_signature(), false, CHECK); 970 971 // Set up method for checking protection domain 972 initialize_known_method(_pd_implies_cache, 973 SystemDictionary::ProtectionDomain_klass(), 974 "impliesCreateAccessControlContext", 975 vmSymbols::void_boolean_signature(), false, CHECK); 976 977 // Set up method for stack walking 978 initialize_known_method(_do_stack_walk_cache, 979 SystemDictionary::AbstractStackWalker_klass(), 980 "doStackWalk", 981 vmSymbols::doStackWalk_signature(), false, CHECK); 982 } 983 984 void universe2_init() { 985 EXCEPTION_MARK; 986 Universe::genesis(CATCH); 987 } 988 989 // Set after initialization of the module runtime, call_initModuleRuntime 990 void universe_post_module_init() { 991 Universe::_module_initialized = true; 992 } 993 994 bool universe_post_init() { 995 assert(!is_init_completed(), "Error: initialization not yet completed!"); 996 Universe::_fully_initialized = true; 997 EXCEPTION_MARK; 998 { ResourceMark rm; 999 Interpreter::initialize(); // needed for interpreter entry points 1000 if (!UseSharedSpaces) { 1001 HandleMark hm(THREAD); 1002 Klass* ok = SystemDictionary::Object_klass(); 1003 Universe::reinitialize_vtable_of(ok, CHECK_false); 1004 Universe::reinitialize_itables(CHECK_false); 1005 } 1006 } 1007 1008 HandleMark hm(THREAD); 1009 // Setup preallocated empty java.lang.Class array 1010 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 1011 1012 // Setup preallocated OutOfMemoryError errors 1013 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 1014 InstanceKlass* ik = InstanceKlass::cast(k); 1015 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false); 1016 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false); 1017 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false); 1018 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false); 1019 Universe::_out_of_memory_error_gc_overhead_limit = 1020 ik->allocate_instance(CHECK_false); 1021 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false); 1022 1023 // Setup preallocated cause message for delayed StackOverflowError 1024 if (StackReservedPages > 0) { 1025 Universe::_delayed_stack_overflow_error_message = 1026 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1027 } 1028 1029 // Setup preallocated NullPointerException 1030 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1031 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1032 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1033 // Setup preallocated ArithmeticException 1034 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1035 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1036 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1037 // Virtual Machine Error for when we get into a situation we can't resolve 1038 k = SystemDictionary::resolve_or_fail( 1039 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1040 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1041 if (!linked) { 1042 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1043 return false; // initialization failed 1044 } 1045 Universe::_virtual_machine_error_instance = 1046 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1047 1048 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1049 1050 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1051 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1052 1053 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 1054 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1055 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 1056 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1057 1058 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1059 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1060 1061 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1062 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1063 1064 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 1065 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 1066 1067 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1068 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1069 1070 // Setup the array of errors that have preallocated backtrace 1071 k = Universe::_out_of_memory_error_java_heap->klass(); 1072 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1073 ik = InstanceKlass::cast(k); 1074 1075 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1076 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false); 1077 for (int i=0; i<len; i++) { 1078 oop err = ik->allocate_instance(CHECK_false); 1079 Handle err_h = Handle(THREAD, err); 1080 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1081 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1082 } 1083 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1084 1085 Universe::initialize_known_methods(CHECK_false); 1086 1087 // This needs to be done before the first scavenge/gc, since 1088 // it's an input to soft ref clearing policy. 1089 { 1090 MutexLocker x(Heap_lock); 1091 Universe::update_heap_info_at_gc(); 1092 } 1093 1094 // ("weak") refs processing infrastructure initialization 1095 Universe::heap()->post_initialize(); 1096 1097 MemoryService::add_metaspace_memory_pools(); 1098 1099 MemoryService::set_universe_heap(Universe::heap()); 1100 #if INCLUDE_CDS 1101 SharedClassUtil::initialize(CHECK_false); 1102 #endif 1103 return true; 1104 } 1105 1106 1107 void Universe::compute_base_vtable_size() { 1108 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1109 } 1110 1111 void Universe::print_on(outputStream* st) { 1112 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1113 st->print_cr("Heap"); 1114 heap()->print_on(st); 1115 } 1116 1117 void Universe::print_heap_at_SIGBREAK() { 1118 if (PrintHeapAtSIGBREAK) { 1119 print_on(tty); 1120 tty->cr(); 1121 tty->flush(); 1122 } 1123 } 1124 1125 void Universe::print_heap_before_gc() { 1126 LogTarget(Debug, gc, heap) lt; 1127 if (lt.is_enabled()) { 1128 LogStream ls(lt); 1129 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1130 ResourceMark rm; 1131 heap()->print_on(&ls); 1132 } 1133 } 1134 1135 void Universe::print_heap_after_gc() { 1136 LogTarget(Debug, gc, heap) lt; 1137 if (lt.is_enabled()) { 1138 LogStream ls(lt); 1139 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1140 ResourceMark rm; 1141 heap()->print_on(&ls); 1142 } 1143 } 1144 1145 void Universe::initialize_verify_flags() { 1146 verify_flags = 0; 1147 const char delimiter[] = " ,"; 1148 1149 size_t length = strlen(VerifySubSet); 1150 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1151 strncpy(subset_list, VerifySubSet, length + 1); 1152 1153 char* token = strtok(subset_list, delimiter); 1154 while (token != NULL) { 1155 if (strcmp(token, "threads") == 0) { 1156 verify_flags |= Verify_Threads; 1157 } else if (strcmp(token, "heap") == 0) { 1158 verify_flags |= Verify_Heap; 1159 } else if (strcmp(token, "symbol_table") == 0) { 1160 verify_flags |= Verify_SymbolTable; 1161 } else if (strcmp(token, "string_table") == 0) { 1162 verify_flags |= Verify_StringTable; 1163 } else if (strcmp(token, "codecache") == 0) { 1164 verify_flags |= Verify_CodeCache; 1165 } else if (strcmp(token, "dictionary") == 0) { 1166 verify_flags |= Verify_SystemDictionary; 1167 } else if (strcmp(token, "classloader_data_graph") == 0) { 1168 verify_flags |= Verify_ClassLoaderDataGraph; 1169 } else if (strcmp(token, "metaspace") == 0) { 1170 verify_flags |= Verify_MetaspaceUtils; 1171 } else if (strcmp(token, "jni_handles") == 0) { 1172 verify_flags |= Verify_JNIHandles; 1173 } else if (strcmp(token, "codecache_oops") == 0) { 1174 verify_flags |= Verify_CodeCacheOops; 1175 } else { 1176 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1177 } 1178 token = strtok(NULL, delimiter); 1179 } 1180 FREE_C_HEAP_ARRAY(char, subset_list); 1181 } 1182 1183 bool Universe::should_verify_subset(uint subset) { 1184 if (verify_flags & subset) { 1185 return true; 1186 } 1187 return false; 1188 } 1189 1190 void Universe::verify(VerifyOption option, const char* prefix) { 1191 // The use of _verify_in_progress is a temporary work around for 1192 // 6320749. Don't bother with a creating a class to set and clear 1193 // it since it is only used in this method and the control flow is 1194 // straight forward. 1195 _verify_in_progress = true; 1196 1197 COMPILER2_PRESENT( 1198 assert(!DerivedPointerTable::is_active(), 1199 "DPT should not be active during verification " 1200 "(of thread stacks below)"); 1201 ) 1202 1203 ResourceMark rm; 1204 HandleMark hm; // Handles created during verification can be zapped 1205 _verify_count++; 1206 1207 FormatBuffer<> title("Verifying %s", prefix); 1208 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1209 if (should_verify_subset(Verify_Threads)) { 1210 log_debug(gc, verify)("Threads"); 1211 Threads::verify(); 1212 } 1213 if (should_verify_subset(Verify_Heap)) { 1214 log_debug(gc, verify)("Heap"); 1215 heap()->verify(option); 1216 } 1217 if (should_verify_subset(Verify_SymbolTable)) { 1218 log_debug(gc, verify)("SymbolTable"); 1219 SymbolTable::verify(); 1220 } 1221 if (should_verify_subset(Verify_StringTable)) { 1222 log_debug(gc, verify)("StringTable"); 1223 StringTable::verify(); 1224 } 1225 if (should_verify_subset(Verify_CodeCache)) { 1226 { 1227 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1228 log_debug(gc, verify)("CodeCache"); 1229 CodeCache::verify(); 1230 } 1231 } 1232 if (should_verify_subset(Verify_SystemDictionary)) { 1233 log_debug(gc, verify)("SystemDictionary"); 1234 SystemDictionary::verify(); 1235 } 1236 #ifndef PRODUCT 1237 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1238 log_debug(gc, verify)("ClassLoaderDataGraph"); 1239 ClassLoaderDataGraph::verify(); 1240 } 1241 #endif 1242 if (should_verify_subset(Verify_MetaspaceUtils)) { 1243 log_debug(gc, verify)("MetaspaceUtils"); 1244 MetaspaceUtils::verify_free_chunks(); 1245 } 1246 if (should_verify_subset(Verify_JNIHandles)) { 1247 log_debug(gc, verify)("JNIHandles"); 1248 JNIHandles::verify(); 1249 } 1250 if (should_verify_subset(Verify_CodeCacheOops)) { 1251 log_debug(gc, verify)("CodeCache Oops"); 1252 CodeCache::verify_oops(); 1253 } 1254 1255 _verify_in_progress = false; 1256 } 1257 1258 1259 #ifndef PRODUCT 1260 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1261 assert(low_boundary < high_boundary, "bad interval"); 1262 1263 // decide which low-order bits we require to be clear: 1264 size_t alignSize = MinObjAlignmentInBytes; 1265 size_t min_object_size = CollectedHeap::min_fill_size(); 1266 1267 // make an inclusive limit: 1268 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1269 uintptr_t min = (uintptr_t)low_boundary; 1270 assert(min < max, "bad interval"); 1271 uintptr_t diff = max ^ min; 1272 1273 // throw away enough low-order bits to make the diff vanish 1274 uintptr_t mask = (uintptr_t)(-1); 1275 while ((mask & diff) != 0) 1276 mask <<= 1; 1277 uintptr_t bits = (min & mask); 1278 assert(bits == (max & mask), "correct mask"); 1279 // check an intermediate value between min and max, just to make sure: 1280 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1281 1282 // require address alignment, too: 1283 mask |= (alignSize - 1); 1284 1285 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1286 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1287 } 1288 _verify_oop_mask = mask; 1289 _verify_oop_bits = bits; 1290 } 1291 1292 // Oop verification (see MacroAssembler::verify_oop) 1293 1294 uintptr_t Universe::verify_oop_mask() { 1295 MemRegion m = heap()->reserved_region(); 1296 calculate_verify_data(m.start(), m.end()); 1297 return _verify_oop_mask; 1298 } 1299 1300 uintptr_t Universe::verify_oop_bits() { 1301 MemRegion m = heap()->reserved_region(); 1302 calculate_verify_data(m.start(), m.end()); 1303 return _verify_oop_bits; 1304 } 1305 1306 uintptr_t Universe::verify_mark_mask() { 1307 return markOopDesc::lock_mask_in_place; 1308 } 1309 1310 uintptr_t Universe::verify_mark_bits() { 1311 intptr_t mask = verify_mark_mask(); 1312 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1313 assert((bits & ~mask) == 0, "no stray header bits"); 1314 return bits; 1315 } 1316 #endif // PRODUCT 1317 1318 1319 void Universe::compute_verify_oop_data() { 1320 verify_oop_mask(); 1321 verify_oop_bits(); 1322 verify_mark_mask(); 1323 verify_mark_bits(); 1324 } 1325 1326 1327 void LatestMethodCache::init(Klass* k, Method* m) { 1328 if (!UseSharedSpaces) { 1329 _klass = k; 1330 } 1331 #ifndef PRODUCT 1332 else { 1333 // sharing initilization should have already set up _klass 1334 assert(_klass != NULL, "just checking"); 1335 } 1336 #endif 1337 1338 _method_idnum = m->method_idnum(); 1339 assert(_method_idnum >= 0, "sanity check"); 1340 } 1341 1342 1343 Method* LatestMethodCache::get_method() { 1344 if (klass() == NULL) return NULL; 1345 InstanceKlass* ik = InstanceKlass::cast(klass()); 1346 Method* m = ik->method_with_idnum(method_idnum()); 1347 assert(m != NULL, "sanity check"); 1348 return m; 1349 } 1350 1351 1352 #ifdef ASSERT 1353 // Release dummy object(s) at bottom of heap 1354 bool Universe::release_fullgc_alot_dummy() { 1355 MutexLocker ml(FullGCALot_lock); 1356 if (_fullgc_alot_dummy_array != NULL) { 1357 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1358 // No more dummies to release, release entire array instead 1359 _fullgc_alot_dummy_array = NULL; 1360 return false; 1361 } 1362 if (!UseConcMarkSweepGC) { 1363 // Release dummy at bottom of old generation 1364 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1365 } 1366 // Release dummy at bottom of permanent generation 1367 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1368 } 1369 return true; 1370 } 1371 1372 #endif // ASSERT