1 /* 2 * Copyright (c) 1997, 2017, 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/cardTableModRefBS.hpp" 36 #include "gc/shared/collectedHeap.inline.hpp" 37 #include "gc/shared/gcLocker.inline.hpp" 38 #include "gc/shared/genCollectedHeap.hpp" 39 #include "gc/shared/generation.hpp" 40 #include "gc/shared/gcTraceTime.inline.hpp" 41 #include "gc/shared/space.hpp" 42 #include "interpreter/interpreter.hpp" 43 #include "logging/log.hpp" 44 #include "logging/logStream.hpp" 45 #include "memory/filemap.hpp" 46 #include "memory/metadataFactory.hpp" 47 #include "memory/metaspaceClosure.hpp" 48 #include "memory/metaspaceShared.hpp" 49 #include "memory/oopFactory.hpp" 50 #include "memory/resourceArea.hpp" 51 #include "memory/universe.hpp" 52 #include "memory/universe.inline.hpp" 53 #include "oops/constantPool.hpp" 54 #include "oops/instanceClassLoaderKlass.hpp" 55 #include "oops/instanceKlass.hpp" 56 #include "oops/instanceMirrorKlass.hpp" 57 #include "oops/instanceRefKlass.hpp" 58 #include "oops/objArrayOop.inline.hpp" 59 #include "oops/oop.inline.hpp" 60 #include "oops/typeArrayKlass.hpp" 61 #include "prims/resolvedMethodTable.hpp" 62 #include "runtime/arguments.hpp" 63 #include "runtime/atomic.hpp" 64 #include "runtime/commandLineFlagConstraintList.hpp" 65 #include "runtime/deoptimization.hpp" 66 #include "runtime/handles.inline.hpp" 67 #include "runtime/init.hpp" 68 #include "runtime/java.hpp" 69 #include "runtime/javaCalls.hpp" 70 #include "runtime/sharedRuntime.hpp" 71 #include "runtime/synchronizer.hpp" 72 #include "runtime/thread.inline.hpp" 73 #include "runtime/timerTrace.hpp" 74 #include "runtime/vm_operations.hpp" 75 #include "services/memoryService.hpp" 76 #include "utilities/align.hpp" 77 #include "utilities/copy.hpp" 78 #include "utilities/debug.hpp" 79 #include "utilities/events.hpp" 80 #include "utilities/formatBuffer.hpp" 81 #include "utilities/hashtable.inline.hpp" 82 #include "utilities/macros.hpp" 83 #include "utilities/ostream.hpp" 84 #include "utilities/preserveException.hpp" 85 #if INCLUDE_ALL_GCS 86 #include "gc/cms/cmsCollectorPolicy.hpp" 87 #include "gc/g1/g1CollectedHeap.inline.hpp" 88 #include "gc/g1/g1CollectorPolicy.hpp" 89 #include "gc/parallel/parallelScavengeHeap.hpp" 90 #include "gc/shared/adaptiveSizePolicy.hpp" 91 #endif // INCLUDE_ALL_GCS 92 #if INCLUDE_CDS 93 #include "classfile/sharedClassUtil.hpp" 94 #endif 95 96 // Known objects 97 Klass* Universe::_boolArrayKlassObj = NULL; 98 Klass* Universe::_byteArrayKlassObj = NULL; 99 Klass* Universe::_charArrayKlassObj = NULL; 100 Klass* Universe::_intArrayKlassObj = NULL; 101 Klass* Universe::_shortArrayKlassObj = NULL; 102 Klass* Universe::_longArrayKlassObj = NULL; 103 Klass* Universe::_singleArrayKlassObj = NULL; 104 Klass* Universe::_doubleArrayKlassObj = NULL; 105 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 106 Klass* Universe::_objectArrayKlassObj = NULL; 107 oop Universe::_int_mirror = NULL; 108 oop Universe::_float_mirror = NULL; 109 oop Universe::_double_mirror = NULL; 110 oop Universe::_byte_mirror = NULL; 111 oop Universe::_bool_mirror = NULL; 112 oop Universe::_char_mirror = NULL; 113 oop Universe::_long_mirror = NULL; 114 oop Universe::_short_mirror = NULL; 115 oop Universe::_void_mirror = NULL; 116 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 117 oop Universe::_main_thread_group = NULL; 118 oop Universe::_system_thread_group = NULL; 119 objArrayOop Universe::_the_empty_class_klass_array = NULL; 120 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 121 oop Universe::_the_null_string = NULL; 122 oop Universe::_the_min_jint_string = NULL; 123 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 124 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 125 LatestMethodCache* Universe::_pd_implies_cache = NULL; 126 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 127 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 128 oop Universe::_out_of_memory_error_java_heap = NULL; 129 oop Universe::_out_of_memory_error_metaspace = NULL; 130 oop Universe::_out_of_memory_error_class_metaspace = NULL; 131 oop Universe::_out_of_memory_error_array_size = NULL; 132 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 133 oop Universe::_out_of_memory_error_realloc_objects = NULL; 134 oop Universe::_delayed_stack_overflow_error_message = NULL; 135 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 136 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 137 bool Universe::_verify_in_progress = false; 138 long Universe::verify_flags = Universe::Verify_All; 139 oop Universe::_null_ptr_exception_instance = NULL; 140 oop Universe::_arithmetic_exception_instance = NULL; 141 oop Universe::_virtual_machine_error_instance = NULL; 142 oop Universe::_vm_exception = NULL; 143 oop Universe::_allocation_context_notification_obj = NULL; 144 oop Universe::_reference_pending_list = NULL; 145 146 Array<int>* Universe::_the_empty_int_array = NULL; 147 Array<u2>* Universe::_the_empty_short_array = NULL; 148 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 149 Array<Method*>* Universe::_the_empty_method_array = NULL; 150 151 // These variables are guarded by FullGCALot_lock. 152 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 153 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 154 155 // Heap 156 int Universe::_verify_count = 0; 157 158 // Oop verification (see MacroAssembler::verify_oop) 159 uintptr_t Universe::_verify_oop_mask = 0; 160 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 161 162 int Universe::_base_vtable_size = 0; 163 bool Universe::_bootstrapping = false; 164 bool Universe::_module_initialized = false; 165 bool Universe::_fully_initialized = false; 166 167 size_t Universe::_heap_capacity_at_last_gc; 168 size_t Universe::_heap_used_at_last_gc = 0; 169 170 CollectedHeap* Universe::_collectedHeap = NULL; 171 172 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 173 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 174 address Universe::_narrow_ptrs_base; 175 176 void Universe::basic_type_classes_do(void f(Klass*)) { 177 f(boolArrayKlassObj()); 178 f(byteArrayKlassObj()); 179 f(charArrayKlassObj()); 180 f(intArrayKlassObj()); 181 f(shortArrayKlassObj()); 182 f(longArrayKlassObj()); 183 f(singleArrayKlassObj()); 184 f(doubleArrayKlassObj()); 185 } 186 187 void Universe::oops_do(OopClosure* f, bool do_all) { 188 189 f->do_oop((oop*) &_int_mirror); 190 f->do_oop((oop*) &_float_mirror); 191 f->do_oop((oop*) &_double_mirror); 192 f->do_oop((oop*) &_byte_mirror); 193 f->do_oop((oop*) &_bool_mirror); 194 f->do_oop((oop*) &_char_mirror); 195 f->do_oop((oop*) &_long_mirror); 196 f->do_oop((oop*) &_short_mirror); 197 f->do_oop((oop*) &_void_mirror); 198 199 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 200 f->do_oop((oop*) &_mirrors[i]); 201 } 202 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 203 204 f->do_oop((oop*)&_the_empty_class_klass_array); 205 f->do_oop((oop*)&_the_null_string); 206 f->do_oop((oop*)&_the_min_jint_string); 207 f->do_oop((oop*)&_out_of_memory_error_java_heap); 208 f->do_oop((oop*)&_out_of_memory_error_metaspace); 209 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 210 f->do_oop((oop*)&_out_of_memory_error_array_size); 211 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 212 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 213 f->do_oop((oop*)&_delayed_stack_overflow_error_message); 214 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 215 f->do_oop((oop*)&_null_ptr_exception_instance); 216 f->do_oop((oop*)&_arithmetic_exception_instance); 217 f->do_oop((oop*)&_virtual_machine_error_instance); 218 f->do_oop((oop*)&_main_thread_group); 219 f->do_oop((oop*)&_system_thread_group); 220 f->do_oop((oop*)&_vm_exception); 221 f->do_oop((oop*)&_allocation_context_notification_obj); 222 f->do_oop((oop*)&_reference_pending_list); 223 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 224 } 225 226 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 227 it->push(&_klass); 228 } 229 230 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 231 it->push(&_boolArrayKlassObj); 232 it->push(&_byteArrayKlassObj); 233 it->push(&_charArrayKlassObj); 234 it->push(&_intArrayKlassObj); 235 it->push(&_shortArrayKlassObj); 236 it->push(&_longArrayKlassObj); 237 it->push(&_singleArrayKlassObj); 238 it->push(&_doubleArrayKlassObj); 239 for (int i = 0; i < T_VOID+1; i++) { 240 it->push(&_typeArrayKlassObjs[i]); 241 } 242 it->push(&_objectArrayKlassObj); 243 244 it->push(&_the_empty_int_array); 245 it->push(&_the_empty_short_array); 246 it->push(&_the_empty_klass_array); 247 it->push(&_the_empty_method_array); 248 it->push(&_the_array_interfaces_array); 249 250 _finalizer_register_cache->metaspace_pointers_do(it); 251 _loader_addClass_cache->metaspace_pointers_do(it); 252 _pd_implies_cache->metaspace_pointers_do(it); 253 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 254 _do_stack_walk_cache->metaspace_pointers_do(it); 255 } 256 257 // Serialize metadata in and out of CDS archive, not oops. 258 void Universe::serialize(SerializeClosure* f, bool do_all) { 259 260 f->do_ptr((void**)&_boolArrayKlassObj); 261 f->do_ptr((void**)&_byteArrayKlassObj); 262 f->do_ptr((void**)&_charArrayKlassObj); 263 f->do_ptr((void**)&_intArrayKlassObj); 264 f->do_ptr((void**)&_shortArrayKlassObj); 265 f->do_ptr((void**)&_longArrayKlassObj); 266 f->do_ptr((void**)&_singleArrayKlassObj); 267 f->do_ptr((void**)&_doubleArrayKlassObj); 268 f->do_ptr((void**)&_objectArrayKlassObj); 269 270 { 271 for (int i = 0; i < T_VOID+1; i++) { 272 if (_typeArrayKlassObjs[i] != NULL) { 273 assert(i >= T_BOOLEAN, "checking"); 274 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 275 } else if (do_all) { 276 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 277 } 278 } 279 } 280 281 f->do_ptr((void**)&_the_array_interfaces_array); 282 f->do_ptr((void**)&_the_empty_int_array); 283 f->do_ptr((void**)&_the_empty_short_array); 284 f->do_ptr((void**)&_the_empty_method_array); 285 f->do_ptr((void**)&_the_empty_klass_array); 286 _finalizer_register_cache->serialize(f); 287 _loader_addClass_cache->serialize(f); 288 _pd_implies_cache->serialize(f); 289 _throw_illegal_access_error_cache->serialize(f); 290 _do_stack_walk_cache->serialize(f); 291 } 292 293 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 294 if (size < alignment || size % alignment != 0) { 295 vm_exit_during_initialization( 296 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 297 } 298 } 299 300 void initialize_basic_type_klass(Klass* k, TRAPS) { 301 Klass* ok = SystemDictionary::Object_klass(); 302 #if INCLUDE_CDS 303 if (UseSharedSpaces) { 304 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 305 assert(k->super() == ok, "u3"); 306 k->restore_unshareable_info(loader_data, Handle(), CHECK); 307 } else 308 #endif 309 { 310 k->initialize_supers(ok, CHECK); 311 } 312 k->append_to_sibling_list(); 313 } 314 315 void Universe::genesis(TRAPS) { 316 ResourceMark rm; 317 318 { FlagSetting fs(_bootstrapping, true); 319 320 { MutexLocker mc(Compile_lock); 321 322 java_lang_Class::allocate_fixup_lists(); 323 324 // determine base vtable size; without that we cannot create the array klasses 325 compute_base_vtable_size(); 326 327 if (!UseSharedSpaces) { 328 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 329 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 330 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 331 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 332 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 333 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 334 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 335 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 336 337 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 338 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 339 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 340 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 341 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 342 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 343 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 344 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 345 346 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 347 348 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 349 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 350 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 351 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 352 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 353 } 354 } 355 356 vmSymbols::initialize(CHECK); 357 358 SystemDictionary::initialize(CHECK); 359 360 Klass* ok = SystemDictionary::Object_klass(); 361 362 _the_null_string = StringTable::intern("null", CHECK); 363 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 364 365 #if INCLUDE_CDS 366 if (UseSharedSpaces) { 367 // Verify shared interfaces array. 368 assert(_the_array_interfaces_array->at(0) == 369 SystemDictionary::Cloneable_klass(), "u3"); 370 assert(_the_array_interfaces_array->at(1) == 371 SystemDictionary::Serializable_klass(), "u3"); 372 MetaspaceShared::fixup_mapped_heap_regions(); 373 } else 374 #endif 375 { 376 // Set up shared interfaces array. (Do this before supers are set up.) 377 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 378 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 379 } 380 381 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 382 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 383 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 384 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 385 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 386 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 387 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 388 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 389 } // end of core bootstrapping 390 391 // Maybe this could be lifted up now that object array can be initialized 392 // during the bootstrapping. 393 394 // OLD 395 // Initialize _objectArrayKlass after core bootstraping to make 396 // sure the super class is set up properly for _objectArrayKlass. 397 // --- 398 // NEW 399 // Since some of the old system object arrays have been converted to 400 // ordinary object arrays, _objectArrayKlass will be loaded when 401 // SystemDictionary::initialize(CHECK); is run. See the extra check 402 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 403 _objectArrayKlassObj = InstanceKlass:: 404 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 405 // OLD 406 // Add the class to the class hierarchy manually to make sure that 407 // its vtable is initialized after core bootstrapping is completed. 408 // --- 409 // New 410 // Have already been initialized. 411 _objectArrayKlassObj->append_to_sibling_list(); 412 413 #ifdef ASSERT 414 if (FullGCALot) { 415 // Allocate an array of dummy objects. 416 // We'd like these to be at the bottom of the old generation, 417 // so that when we free one and then collect, 418 // (almost) the whole heap moves 419 // and we find out if we actually update all the oops correctly. 420 // But we can't allocate directly in the old generation, 421 // so we allocate wherever, and hope that the first collection 422 // moves these objects to the bottom of the old generation. 423 // We can allocate directly in the permanent generation, so we do. 424 int size; 425 if (UseConcMarkSweepGC) { 426 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate"); 427 size = FullGCALotDummies; 428 } else { 429 size = FullGCALotDummies * 2; 430 } 431 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 432 objArrayHandle dummy_array(THREAD, naked_array); 433 int i = 0; 434 while (i < size) { 435 // Allocate dummy in old generation 436 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 437 dummy_array->obj_at_put(i++, dummy); 438 } 439 { 440 // Only modify the global variable inside the mutex. 441 // If we had a race to here, the other dummy_array instances 442 // and their elements just get dropped on the floor, which is fine. 443 MutexLocker ml(FullGCALot_lock); 444 if (_fullgc_alot_dummy_array == NULL) { 445 _fullgc_alot_dummy_array = dummy_array(); 446 } 447 } 448 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 449 } 450 #endif 451 452 // Initialize dependency array for null class loader 453 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 454 455 } 456 457 void Universe::initialize_basic_type_mirrors(TRAPS) { 458 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 459 _int_mirror = 460 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 461 _float_mirror = 462 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 463 _double_mirror = 464 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 465 _byte_mirror = 466 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 467 _bool_mirror = 468 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 469 _char_mirror = 470 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 471 _long_mirror = 472 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 473 _short_mirror = 474 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 475 _void_mirror = 476 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 477 478 _mirrors[T_INT] = _int_mirror; 479 _mirrors[T_FLOAT] = _float_mirror; 480 _mirrors[T_DOUBLE] = _double_mirror; 481 _mirrors[T_BYTE] = _byte_mirror; 482 _mirrors[T_BOOLEAN] = _bool_mirror; 483 _mirrors[T_CHAR] = _char_mirror; 484 _mirrors[T_LONG] = _long_mirror; 485 _mirrors[T_SHORT] = _short_mirror; 486 _mirrors[T_VOID] = _void_mirror; 487 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 488 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 489 } 490 491 void Universe::fixup_mirrors(TRAPS) { 492 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 493 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 494 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 495 // that the number of objects allocated at this point is very small. 496 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 497 HandleMark hm(THREAD); 498 // Cache the start of the static fields 499 InstanceMirrorKlass::init_offset_of_static_fields(); 500 501 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 502 int list_length = list->length(); 503 for (int i = 0; i < list_length; i++) { 504 Klass* k = list->at(i); 505 assert(k->is_klass(), "List should only hold classes"); 506 EXCEPTION_MARK; 507 java_lang_Class::fixup_mirror(k, CATCH); 508 } 509 delete java_lang_Class::fixup_mirror_list(); 510 java_lang_Class::set_fixup_mirror_list(NULL); 511 } 512 513 #define assert_pll_locked(test) \ 514 assert(Heap_lock->test(), "Reference pending list access requires lock") 515 516 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 517 518 oop Universe::reference_pending_list() { 519 if (Thread::current()->is_VM_thread()) { 520 assert_pll_locked(is_locked); 521 } else { 522 assert_pll_ownership(); 523 } 524 return _reference_pending_list; 525 } 526 527 void Universe::set_reference_pending_list(oop list) { 528 assert_pll_ownership(); 529 _reference_pending_list = list; 530 } 531 532 bool Universe::has_reference_pending_list() { 533 assert_pll_ownership(); 534 return _reference_pending_list != NULL; 535 } 536 537 oop Universe::swap_reference_pending_list(oop list) { 538 assert_pll_locked(is_locked); 539 return (oop)Atomic::xchg_ptr(list, &_reference_pending_list); 540 } 541 542 #undef assert_pll_locked 543 #undef assert_pll_ownership 544 545 546 static bool has_run_finalizers_on_exit = false; 547 548 void Universe::run_finalizers_on_exit() { 549 if (has_run_finalizers_on_exit) return; 550 has_run_finalizers_on_exit = true; 551 552 // Called on VM exit. This ought to be run in a separate thread. 553 log_trace(ref)("Callback to run finalizers on exit"); 554 { 555 PRESERVE_EXCEPTION_MARK; 556 Klass* finalizer_klass = SystemDictionary::Finalizer_klass(); 557 JavaValue result(T_VOID); 558 JavaCalls::call_static( 559 &result, 560 finalizer_klass, 561 vmSymbols::run_finalizers_on_exit_name(), 562 vmSymbols::void_method_signature(), 563 THREAD 564 ); 565 // Ignore any pending exceptions 566 CLEAR_PENDING_EXCEPTION; 567 } 568 } 569 570 571 // initialize_vtable could cause gc if 572 // 1) we specified true to initialize_vtable and 573 // 2) this ran after gc was enabled 574 // In case those ever change we use handles for oops 575 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) { 576 // init vtable of k and all subclasses 577 ko->vtable().initialize_vtable(false, CHECK); 578 if (ko->is_instance_klass()) { 579 for (Klass* sk = ko->subklass(); 580 sk != NULL; 581 sk = sk->next_sibling()) { 582 reinitialize_vtable_of(sk, CHECK); 583 } 584 } 585 } 586 587 588 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) { 589 k->itable().initialize_itable(false, CHECK); 590 } 591 592 593 void Universe::reinitialize_itables(TRAPS) { 594 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK); 595 } 596 597 598 bool Universe::on_page_boundary(void* addr) { 599 return is_aligned(addr, os::vm_page_size()); 600 } 601 602 603 bool Universe::should_fill_in_stack_trace(Handle throwable) { 604 // never attempt to fill in the stack trace of preallocated errors that do not have 605 // backtrace. These errors are kept alive forever and may be "re-used" when all 606 // preallocated errors with backtrace have been consumed. Also need to avoid 607 // a potential loop which could happen if an out of memory occurs when attempting 608 // to allocate the backtrace. 609 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 610 (throwable() != Universe::_out_of_memory_error_metaspace) && 611 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 612 (throwable() != Universe::_out_of_memory_error_array_size) && 613 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) && 614 (throwable() != Universe::_out_of_memory_error_realloc_objects)); 615 } 616 617 618 oop Universe::gen_out_of_memory_error(oop default_err) { 619 // generate an out of memory error: 620 // - if there is a preallocated error and stack traces are available 621 // (j.l.Throwable is initialized), then return the preallocated 622 // error with a filled in stack trace, and with the message 623 // provided by the default error. 624 // - otherwise, return the default error, without a stack trace. 625 int next; 626 if ((_preallocated_out_of_memory_error_avail_count > 0) && 627 SystemDictionary::Throwable_klass()->is_initialized()) { 628 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 629 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 630 } else { 631 next = -1; 632 } 633 if (next < 0) { 634 // all preallocated errors have been used. 635 // return default 636 return default_err; 637 } else { 638 Thread* THREAD = Thread::current(); 639 Handle default_err_h(THREAD, default_err); 640 // get the error object at the slot and set set it to NULL so that the 641 // array isn't keeping it alive anymore. 642 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next)); 643 assert(exc() != NULL, "slot has been used already"); 644 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 645 646 // use the message from the default error 647 oop msg = java_lang_Throwable::message(default_err_h()); 648 assert(msg != NULL, "no message"); 649 java_lang_Throwable::set_message(exc(), msg); 650 651 // populate the stack trace and return it. 652 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 653 return exc(); 654 } 655 } 656 657 intptr_t Universe::_non_oop_bits = 0; 658 659 void* Universe::non_oop_word() { 660 // Neither the high bits nor the low bits of this value is allowed 661 // to look like (respectively) the high or low bits of a real oop. 662 // 663 // High and low are CPU-specific notions, but low always includes 664 // the low-order bit. Since oops are always aligned at least mod 4, 665 // setting the low-order bit will ensure that the low half of the 666 // word will never look like that of a real oop. 667 // 668 // Using the OS-supplied non-memory-address word (usually 0 or -1) 669 // will take care of the high bits, however many there are. 670 671 if (_non_oop_bits == 0) { 672 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 673 } 674 675 return (void*)_non_oop_bits; 676 } 677 678 jint universe_init() { 679 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 680 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 681 "LogHeapWordSize is incorrect."); 682 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 683 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 684 "oop size is not not a multiple of HeapWord size"); 685 686 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 687 688 JavaClasses::compute_hard_coded_offsets(); 689 690 jint status = Universe::initialize_heap(); 691 if (status != JNI_OK) { 692 return status; 693 } 694 695 Metaspace::global_initialize(); 696 697 AOTLoader::universe_init(); 698 699 // Checks 'AfterMemoryInit' constraints. 700 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) { 701 return JNI_EINVAL; 702 } 703 704 // Create memory for metadata. Must be after initializing heap for 705 // DumpSharedSpaces. 706 ClassLoaderData::init_null_class_loader_data(); 707 708 // We have a heap so create the Method* caches before 709 // Metaspace::initialize_shared_spaces() tries to populate them. 710 Universe::_finalizer_register_cache = new LatestMethodCache(); 711 Universe::_loader_addClass_cache = new LatestMethodCache(); 712 Universe::_pd_implies_cache = new LatestMethodCache(); 713 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 714 Universe::_do_stack_walk_cache = new LatestMethodCache(); 715 716 #if INCLUDE_CDS 717 if (UseSharedSpaces) { 718 // Read the data structures supporting the shared spaces (shared 719 // system dictionary, symbol table, etc.). After that, access to 720 // the file (other than the mapped regions) is no longer needed, and 721 // the file is closed. Closing the file does not affect the 722 // currently mapped regions. 723 MetaspaceShared::initialize_shared_spaces(); 724 StringTable::create_table(); 725 } else 726 #endif 727 { 728 SymbolTable::create_table(); 729 StringTable::create_table(); 730 731 #if INCLUDE_CDS 732 if (DumpSharedSpaces) { 733 MetaspaceShared::prepare_for_dumping(); 734 } 735 #endif 736 } 737 if (strlen(VerifySubSet) > 0) { 738 Universe::initialize_verify_flags(); 739 } 740 741 ResolvedMethodTable::create_table(); 742 743 return JNI_OK; 744 } 745 746 CollectedHeap* Universe::create_heap() { 747 assert(_collectedHeap == NULL, "Heap already created"); 748 #if !INCLUDE_ALL_GCS 749 if (UseParallelGC) { 750 fatal("UseParallelGC not supported in this VM."); 751 } else if (UseG1GC) { 752 fatal("UseG1GC not supported in this VM."); 753 } else if (UseConcMarkSweepGC) { 754 fatal("UseConcMarkSweepGC not supported in this VM."); 755 #else 756 if (UseParallelGC) { 757 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>(); 758 } else if (UseG1GC) { 759 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>(); 760 } else if (UseConcMarkSweepGC) { 761 return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>(); 762 #endif 763 } else if (UseSerialGC) { 764 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>(); 765 } 766 767 ShouldNotReachHere(); 768 return NULL; 769 } 770 771 // Choose the heap base address and oop encoding mode 772 // when compressed oops are used: 773 // Unscaled - Use 32-bits oops without encoding when 774 // NarrowOopHeapBaseMin + heap_size < 4Gb 775 // ZeroBased - Use zero based compressed oops with encoding when 776 // NarrowOopHeapBaseMin + heap_size < 32Gb 777 // HeapBased - Use compressed oops with heap base + encoding. 778 779 jint Universe::initialize_heap() { 780 jint status = JNI_ERR; 781 782 _collectedHeap = create_heap_ext(); 783 if (_collectedHeap == NULL) { 784 _collectedHeap = create_heap(); 785 } 786 787 status = _collectedHeap->initialize(); 788 if (status != JNI_OK) { 789 return status; 790 } 791 log_info(gc)("Using %s", _collectedHeap->name()); 792 793 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 794 795 #ifdef _LP64 796 if (UseCompressedOops) { 797 // Subtract a page because something can get allocated at heap base. 798 // This also makes implicit null checking work, because the 799 // memory+1 page below heap_base needs to cause a signal. 800 // See needs_explicit_null_check. 801 // Only set the heap base for compressed oops because it indicates 802 // compressed oops for pstack code. 803 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 804 // Didn't reserve heap below 4Gb. Must shift. 805 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 806 } 807 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 808 // Did reserve heap below 32Gb. Can use base == 0; 809 Universe::set_narrow_oop_base(0); 810 } 811 812 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 813 814 LogTarget(Info, gc, heap, coops) lt; 815 if (lt.is_enabled()) { 816 ResourceMark rm; 817 LogStream ls(lt); 818 Universe::print_compressed_oops_mode(&ls); 819 } 820 821 // Tell tests in which mode we run. 822 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 823 narrow_oop_mode_to_string(narrow_oop_mode()), 824 false)); 825 } 826 // Universe::narrow_oop_base() is one page below the heap. 827 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 828 os::vm_page_size()) || 829 Universe::narrow_oop_base() == NULL, "invalid value"); 830 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 831 Universe::narrow_oop_shift() == 0, "invalid value"); 832 #endif 833 834 // We will never reach the CATCH below since Exceptions::_throw will cause 835 // the VM to exit if an exception is thrown during initialization 836 837 if (UseTLAB) { 838 assert(Universe::heap()->supports_tlab_allocation(), 839 "Should support thread-local allocation buffers"); 840 ThreadLocalAllocBuffer::startup_initialization(); 841 } 842 return JNI_OK; 843 } 844 845 void Universe::print_compressed_oops_mode(outputStream* st) { 846 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 847 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 848 849 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 850 851 if (Universe::narrow_oop_base() != 0) { 852 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 853 } 854 855 if (Universe::narrow_oop_shift() != 0) { 856 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 857 } 858 859 if (!Universe::narrow_oop_use_implicit_null_checks()) { 860 st->print(", no protected page in front of the heap"); 861 } 862 st->cr(); 863 } 864 865 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 866 867 assert(alignment <= Arguments::conservative_max_heap_alignment(), 868 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 869 alignment, Arguments::conservative_max_heap_alignment()); 870 871 size_t total_reserved = align_up(heap_size, alignment); 872 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 873 "heap size is too big for compressed oops"); 874 875 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size()); 876 assert(!UseLargePages 877 || UseParallelGC 878 || use_large_pages, "Wrong alignment to use large pages"); 879 880 // Now create the space. 881 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages); 882 883 if (total_rs.is_reserved()) { 884 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 885 "must be exactly of required size and alignment"); 886 // We are good. 887 888 if (UseCompressedOops) { 889 // Universe::initialize_heap() will reset this to NULL if unscaled 890 // or zero-based narrow oops are actually used. 891 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 892 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 893 } 894 895 return total_rs; 896 } 897 898 vm_exit_during_initialization( 899 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 900 total_reserved/K)); 901 902 // satisfy compiler 903 ShouldNotReachHere(); 904 return ReservedHeapSpace(0, 0, false); 905 } 906 907 908 // It's the caller's responsibility to ensure glitch-freedom 909 // (if required). 910 void Universe::update_heap_info_at_gc() { 911 _heap_capacity_at_last_gc = heap()->capacity(); 912 _heap_used_at_last_gc = heap()->used(); 913 } 914 915 916 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 917 switch (mode) { 918 case UnscaledNarrowOop: 919 return "32-bit"; 920 case ZeroBasedNarrowOop: 921 return "Zero based"; 922 case DisjointBaseNarrowOop: 923 return "Non-zero disjoint base"; 924 case HeapBasedNarrowOop: 925 return "Non-zero based"; 926 default: 927 ShouldNotReachHere(); 928 return ""; 929 } 930 } 931 932 933 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 934 if (narrow_oop_base_disjoint()) { 935 return DisjointBaseNarrowOop; 936 } 937 938 if (narrow_oop_base() != 0) { 939 return HeapBasedNarrowOop; 940 } 941 942 if (narrow_oop_shift() != 0) { 943 return ZeroBasedNarrowOop; 944 } 945 946 return UnscaledNarrowOop; 947 } 948 949 void initialize_known_method(LatestMethodCache* method_cache, 950 InstanceKlass* ik, 951 const char* method, 952 Symbol* signature, 953 bool is_static, TRAPS) 954 { 955 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK); 956 Method* m = NULL; 957 // The klass must be linked before looking up the method. 958 if (!ik->link_class_or_fail(THREAD) || 959 ((m = ik->find_method(name, signature)) == NULL) || 960 is_static != m->is_static()) { 961 ResourceMark rm(THREAD); 962 // NoSuchMethodException doesn't actually work because it tries to run the 963 // <init> function before java_lang_Class is linked. Print error and exit. 964 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 965 ik->name()->as_C_string(), method)); 966 } 967 method_cache->init(ik, m); 968 } 969 970 void Universe::initialize_known_methods(TRAPS) { 971 // Set up static method for registering finalizers 972 initialize_known_method(_finalizer_register_cache, 973 SystemDictionary::Finalizer_klass(), 974 "register", 975 vmSymbols::object_void_signature(), true, CHECK); 976 977 initialize_known_method(_throw_illegal_access_error_cache, 978 SystemDictionary::internal_Unsafe_klass(), 979 "throwIllegalAccessError", 980 vmSymbols::void_method_signature(), true, CHECK); 981 982 // Set up method for registering loaded classes in class loader vector 983 initialize_known_method(_loader_addClass_cache, 984 SystemDictionary::ClassLoader_klass(), 985 "addClass", 986 vmSymbols::class_void_signature(), false, CHECK); 987 988 // Set up method for checking protection domain 989 initialize_known_method(_pd_implies_cache, 990 SystemDictionary::ProtectionDomain_klass(), 991 "impliesCreateAccessControlContext", 992 vmSymbols::void_boolean_signature(), false, CHECK); 993 994 // Set up method for stack walking 995 initialize_known_method(_do_stack_walk_cache, 996 SystemDictionary::AbstractStackWalker_klass(), 997 "doStackWalk", 998 vmSymbols::doStackWalk_signature(), false, CHECK); 999 } 1000 1001 void universe2_init() { 1002 EXCEPTION_MARK; 1003 Universe::genesis(CATCH); 1004 } 1005 1006 // Set after initialization of the module runtime, call_initModuleRuntime 1007 void universe_post_module_init() { 1008 Universe::_module_initialized = true; 1009 } 1010 1011 bool universe_post_init() { 1012 assert(!is_init_completed(), "Error: initialization not yet completed!"); 1013 Universe::_fully_initialized = true; 1014 EXCEPTION_MARK; 1015 { ResourceMark rm; 1016 Interpreter::initialize(); // needed for interpreter entry points 1017 if (!UseSharedSpaces) { 1018 HandleMark hm(THREAD); 1019 Klass* ok = SystemDictionary::Object_klass(); 1020 Universe::reinitialize_vtable_of(ok, CHECK_false); 1021 Universe::reinitialize_itables(CHECK_false); 1022 } 1023 } 1024 1025 HandleMark hm(THREAD); 1026 // Setup preallocated empty java.lang.Class array 1027 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 1028 1029 // Setup preallocated OutOfMemoryError errors 1030 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 1031 InstanceKlass* ik = InstanceKlass::cast(k); 1032 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false); 1033 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false); 1034 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false); 1035 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false); 1036 Universe::_out_of_memory_error_gc_overhead_limit = 1037 ik->allocate_instance(CHECK_false); 1038 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false); 1039 1040 // Setup preallocated cause message for delayed StackOverflowError 1041 if (StackReservedPages > 0) { 1042 Universe::_delayed_stack_overflow_error_message = 1043 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1044 } 1045 1046 // Setup preallocated NullPointerException 1047 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1048 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1049 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1050 // Setup preallocated ArithmeticException 1051 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1052 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1053 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1054 // Virtual Machine Error for when we get into a situation we can't resolve 1055 k = SystemDictionary::resolve_or_fail( 1056 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1057 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1058 if (!linked) { 1059 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1060 return false; // initialization failed 1061 } 1062 Universe::_virtual_machine_error_instance = 1063 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1064 1065 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1066 1067 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1068 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1069 1070 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 1071 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1072 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 1073 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1074 1075 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1076 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1077 1078 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1079 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1080 1081 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 1082 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 1083 1084 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1085 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1086 1087 // Setup the array of errors that have preallocated backtrace 1088 k = Universe::_out_of_memory_error_java_heap->klass(); 1089 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1090 ik = InstanceKlass::cast(k); 1091 1092 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1093 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false); 1094 for (int i=0; i<len; i++) { 1095 oop err = ik->allocate_instance(CHECK_false); 1096 Handle err_h = Handle(THREAD, err); 1097 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1098 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1099 } 1100 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1101 1102 Universe::initialize_known_methods(CHECK_false); 1103 1104 // This needs to be done before the first scavenge/gc, since 1105 // it's an input to soft ref clearing policy. 1106 { 1107 MutexLocker x(Heap_lock); 1108 Universe::update_heap_info_at_gc(); 1109 } 1110 1111 // ("weak") refs processing infrastructure initialization 1112 Universe::heap()->post_initialize(); 1113 1114 // Initialize performance counters for metaspaces 1115 MetaspaceCounters::initialize_performance_counters(); 1116 CompressedClassSpaceCounters::initialize_performance_counters(); 1117 1118 MemoryService::add_metaspace_memory_pools(); 1119 1120 MemoryService::set_universe_heap(Universe::heap()); 1121 #if INCLUDE_CDS 1122 SharedClassUtil::initialize(CHECK_false); 1123 #endif 1124 return true; 1125 } 1126 1127 1128 void Universe::compute_base_vtable_size() { 1129 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1130 } 1131 1132 void Universe::print_on(outputStream* st) { 1133 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1134 st->print_cr("Heap"); 1135 heap()->print_on(st); 1136 } 1137 1138 void Universe::print_heap_at_SIGBREAK() { 1139 if (PrintHeapAtSIGBREAK) { 1140 print_on(tty); 1141 tty->cr(); 1142 tty->flush(); 1143 } 1144 } 1145 1146 void Universe::print_heap_before_gc() { 1147 LogTarget(Debug, gc, heap) lt; 1148 if (lt.is_enabled()) { 1149 LogStream ls(lt); 1150 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1151 ResourceMark rm; 1152 heap()->print_on(&ls); 1153 } 1154 } 1155 1156 void Universe::print_heap_after_gc() { 1157 LogTarget(Debug, gc, heap) lt; 1158 if (lt.is_enabled()) { 1159 LogStream ls(lt); 1160 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1161 ResourceMark rm; 1162 heap()->print_on(&ls); 1163 } 1164 } 1165 1166 void Universe::initialize_verify_flags() { 1167 verify_flags = 0; 1168 const char delimiter[] = " ,"; 1169 1170 size_t length = strlen(VerifySubSet); 1171 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1172 strncpy(subset_list, VerifySubSet, length + 1); 1173 1174 char* token = strtok(subset_list, delimiter); 1175 while (token != NULL) { 1176 if (strcmp(token, "threads") == 0) { 1177 verify_flags |= Verify_Threads; 1178 } else if (strcmp(token, "heap") == 0) { 1179 verify_flags |= Verify_Heap; 1180 } else if (strcmp(token, "symbol_table") == 0) { 1181 verify_flags |= Verify_SymbolTable; 1182 } else if (strcmp(token, "string_table") == 0) { 1183 verify_flags |= Verify_StringTable; 1184 } else if (strcmp(token, "codecache") == 0) { 1185 verify_flags |= Verify_CodeCache; 1186 } else if (strcmp(token, "dictionary") == 0) { 1187 verify_flags |= Verify_SystemDictionary; 1188 } else if (strcmp(token, "classloader_data_graph") == 0) { 1189 verify_flags |= Verify_ClassLoaderDataGraph; 1190 } else if (strcmp(token, "metaspace") == 0) { 1191 verify_flags |= Verify_MetaspaceAux; 1192 } else if (strcmp(token, "jni_handles") == 0) { 1193 verify_flags |= Verify_JNIHandles; 1194 } else if (strcmp(token, "codecache_oops") == 0) { 1195 verify_flags |= Verify_CodeCacheOops; 1196 } else { 1197 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1198 } 1199 token = strtok(NULL, delimiter); 1200 } 1201 FREE_C_HEAP_ARRAY(char, subset_list); 1202 } 1203 1204 bool Universe::should_verify_subset(uint subset) { 1205 if (verify_flags & subset) { 1206 return true; 1207 } 1208 return false; 1209 } 1210 1211 void Universe::verify(VerifyOption option, const char* prefix) { 1212 // The use of _verify_in_progress is a temporary work around for 1213 // 6320749. Don't bother with a creating a class to set and clear 1214 // it since it is only used in this method and the control flow is 1215 // straight forward. 1216 _verify_in_progress = true; 1217 1218 COMPILER2_PRESENT( 1219 assert(!DerivedPointerTable::is_active(), 1220 "DPT should not be active during verification " 1221 "(of thread stacks below)"); 1222 ) 1223 1224 ResourceMark rm; 1225 HandleMark hm; // Handles created during verification can be zapped 1226 _verify_count++; 1227 1228 FormatBuffer<> title("Verifying %s", prefix); 1229 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1230 if (should_verify_subset(Verify_Threads)) { 1231 log_debug(gc, verify)("Threads"); 1232 Threads::verify(); 1233 } 1234 if (should_verify_subset(Verify_Heap)) { 1235 log_debug(gc, verify)("Heap"); 1236 heap()->verify(option); 1237 } 1238 if (should_verify_subset(Verify_SymbolTable)) { 1239 log_debug(gc, verify)("SymbolTable"); 1240 SymbolTable::verify(); 1241 } 1242 if (should_verify_subset(Verify_StringTable)) { 1243 log_debug(gc, verify)("StringTable"); 1244 StringTable::verify(); 1245 } 1246 if (should_verify_subset(Verify_CodeCache)) { 1247 { 1248 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1249 log_debug(gc, verify)("CodeCache"); 1250 CodeCache::verify(); 1251 } 1252 } 1253 if (should_verify_subset(Verify_SystemDictionary)) { 1254 log_debug(gc, verify)("SystemDictionary"); 1255 SystemDictionary::verify(); 1256 } 1257 #ifndef PRODUCT 1258 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1259 log_debug(gc, verify)("ClassLoaderDataGraph"); 1260 ClassLoaderDataGraph::verify(); 1261 } 1262 #endif 1263 if (should_verify_subset(Verify_MetaspaceAux)) { 1264 log_debug(gc, verify)("MetaspaceAux"); 1265 MetaspaceAux::verify_free_chunks(); 1266 } 1267 if (should_verify_subset(Verify_JNIHandles)) { 1268 log_debug(gc, verify)("JNIHandles"); 1269 JNIHandles::verify(); 1270 } 1271 if (should_verify_subset(Verify_CodeCacheOops)) { 1272 log_debug(gc, verify)("CodeCache Oops"); 1273 CodeCache::verify_oops(); 1274 } 1275 1276 _verify_in_progress = false; 1277 } 1278 1279 1280 #ifndef PRODUCT 1281 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1282 assert(low_boundary < high_boundary, "bad interval"); 1283 1284 // decide which low-order bits we require to be clear: 1285 size_t alignSize = MinObjAlignmentInBytes; 1286 size_t min_object_size = CollectedHeap::min_fill_size(); 1287 1288 // make an inclusive limit: 1289 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1290 uintptr_t min = (uintptr_t)low_boundary; 1291 assert(min < max, "bad interval"); 1292 uintptr_t diff = max ^ min; 1293 1294 // throw away enough low-order bits to make the diff vanish 1295 uintptr_t mask = (uintptr_t)(-1); 1296 while ((mask & diff) != 0) 1297 mask <<= 1; 1298 uintptr_t bits = (min & mask); 1299 assert(bits == (max & mask), "correct mask"); 1300 // check an intermediate value between min and max, just to make sure: 1301 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1302 1303 // require address alignment, too: 1304 mask |= (alignSize - 1); 1305 1306 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1307 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1308 } 1309 _verify_oop_mask = mask; 1310 _verify_oop_bits = bits; 1311 } 1312 1313 // Oop verification (see MacroAssembler::verify_oop) 1314 1315 uintptr_t Universe::verify_oop_mask() { 1316 MemRegion m = heap()->reserved_region(); 1317 calculate_verify_data(m.start(), m.end()); 1318 return _verify_oop_mask; 1319 } 1320 1321 uintptr_t Universe::verify_oop_bits() { 1322 MemRegion m = heap()->reserved_region(); 1323 calculate_verify_data(m.start(), m.end()); 1324 return _verify_oop_bits; 1325 } 1326 1327 uintptr_t Universe::verify_mark_mask() { 1328 return markOopDesc::lock_mask_in_place; 1329 } 1330 1331 uintptr_t Universe::verify_mark_bits() { 1332 intptr_t mask = verify_mark_mask(); 1333 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1334 assert((bits & ~mask) == 0, "no stray header bits"); 1335 return bits; 1336 } 1337 #endif // PRODUCT 1338 1339 1340 void Universe::compute_verify_oop_data() { 1341 verify_oop_mask(); 1342 verify_oop_bits(); 1343 verify_mark_mask(); 1344 verify_mark_bits(); 1345 } 1346 1347 1348 void LatestMethodCache::init(Klass* k, Method* m) { 1349 if (!UseSharedSpaces) { 1350 _klass = k; 1351 } 1352 #ifndef PRODUCT 1353 else { 1354 // sharing initilization should have already set up _klass 1355 assert(_klass != NULL, "just checking"); 1356 } 1357 #endif 1358 1359 _method_idnum = m->method_idnum(); 1360 assert(_method_idnum >= 0, "sanity check"); 1361 } 1362 1363 1364 Method* LatestMethodCache::get_method() { 1365 if (klass() == NULL) return NULL; 1366 InstanceKlass* ik = InstanceKlass::cast(klass()); 1367 Method* m = ik->method_with_idnum(method_idnum()); 1368 assert(m != NULL, "sanity check"); 1369 return m; 1370 } 1371 1372 1373 #ifdef ASSERT 1374 // Release dummy object(s) at bottom of heap 1375 bool Universe::release_fullgc_alot_dummy() { 1376 MutexLocker ml(FullGCALot_lock); 1377 if (_fullgc_alot_dummy_array != NULL) { 1378 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1379 // No more dummies to release, release entire array instead 1380 _fullgc_alot_dummy_array = NULL; 1381 return false; 1382 } 1383 if (!UseConcMarkSweepGC) { 1384 // Release dummy at bottom of old generation 1385 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1386 } 1387 // Release dummy at bottom of permanent generation 1388 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1389 } 1390 return true; 1391 } 1392 1393 #endif // ASSERT