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/cms/cmsHeap.hpp" 88 #include "gc/g1/g1CollectedHeap.inline.hpp" 89 #include "gc/g1/g1CollectorPolicy.hpp" 90 #include "gc/parallel/parallelScavengeHeap.hpp" 91 #include "gc/shared/adaptiveSizePolicy.hpp" 92 #endif // INCLUDE_ALL_GCS 93 #if INCLUDE_CDS 94 #include "classfile/sharedClassUtil.hpp" 95 #endif 96 97 // Known objects 98 Klass* Universe::_boolArrayKlassObj = NULL; 99 Klass* Universe::_byteArrayKlassObj = NULL; 100 Klass* Universe::_charArrayKlassObj = NULL; 101 Klass* Universe::_intArrayKlassObj = NULL; 102 Klass* Universe::_shortArrayKlassObj = NULL; 103 Klass* Universe::_longArrayKlassObj = NULL; 104 Klass* Universe::_singleArrayKlassObj = NULL; 105 Klass* Universe::_doubleArrayKlassObj = NULL; 106 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 107 Klass* Universe::_objectArrayKlassObj = NULL; 108 oop Universe::_int_mirror = NULL; 109 oop Universe::_float_mirror = NULL; 110 oop Universe::_double_mirror = NULL; 111 oop Universe::_byte_mirror = NULL; 112 oop Universe::_bool_mirror = NULL; 113 oop Universe::_char_mirror = NULL; 114 oop Universe::_long_mirror = NULL; 115 oop Universe::_short_mirror = NULL; 116 oop Universe::_void_mirror = NULL; 117 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 118 oop Universe::_main_thread_group = NULL; 119 oop Universe::_system_thread_group = NULL; 120 objArrayOop Universe::_the_empty_class_klass_array = NULL; 121 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 122 oop Universe::_the_null_string = NULL; 123 oop Universe::_the_min_jint_string = NULL; 124 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 125 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 126 LatestMethodCache* Universe::_pd_implies_cache = NULL; 127 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 128 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 129 oop Universe::_out_of_memory_error_java_heap = NULL; 130 oop Universe::_out_of_memory_error_metaspace = NULL; 131 oop Universe::_out_of_memory_error_class_metaspace = NULL; 132 oop Universe::_out_of_memory_error_array_size = NULL; 133 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 134 oop Universe::_out_of_memory_error_realloc_objects = NULL; 135 oop Universe::_delayed_stack_overflow_error_message = NULL; 136 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 137 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 138 bool Universe::_verify_in_progress = false; 139 long Universe::verify_flags = Universe::Verify_All; 140 oop Universe::_null_ptr_exception_instance = NULL; 141 oop Universe::_arithmetic_exception_instance = NULL; 142 oop Universe::_virtual_machine_error_instance = NULL; 143 oop Universe::_vm_exception = NULL; 144 oop Universe::_allocation_context_notification_obj = NULL; 145 oop Universe::_reference_pending_list = NULL; 146 147 Array<int>* Universe::_the_empty_int_array = NULL; 148 Array<u2>* Universe::_the_empty_short_array = NULL; 149 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 150 Array<Method*>* Universe::_the_empty_method_array = NULL; 151 152 // These variables are guarded by FullGCALot_lock. 153 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 154 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 155 156 // Heap 157 int Universe::_verify_count = 0; 158 159 // Oop verification (see MacroAssembler::verify_oop) 160 uintptr_t Universe::_verify_oop_mask = 0; 161 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 162 163 int Universe::_base_vtable_size = 0; 164 bool Universe::_bootstrapping = false; 165 bool Universe::_module_initialized = false; 166 bool Universe::_fully_initialized = false; 167 168 size_t Universe::_heap_capacity_at_last_gc; 169 size_t Universe::_heap_used_at_last_gc = 0; 170 171 CollectedHeap* Universe::_collectedHeap = NULL; 172 173 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 174 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 175 address Universe::_narrow_ptrs_base; 176 177 void Universe::basic_type_classes_do(void f(Klass*)) { 178 f(boolArrayKlassObj()); 179 f(byteArrayKlassObj()); 180 f(charArrayKlassObj()); 181 f(intArrayKlassObj()); 182 f(shortArrayKlassObj()); 183 f(longArrayKlassObj()); 184 f(singleArrayKlassObj()); 185 f(doubleArrayKlassObj()); 186 } 187 188 void Universe::oops_do(OopClosure* f, bool do_all) { 189 190 f->do_oop((oop*) &_int_mirror); 191 f->do_oop((oop*) &_float_mirror); 192 f->do_oop((oop*) &_double_mirror); 193 f->do_oop((oop*) &_byte_mirror); 194 f->do_oop((oop*) &_bool_mirror); 195 f->do_oop((oop*) &_char_mirror); 196 f->do_oop((oop*) &_long_mirror); 197 f->do_oop((oop*) &_short_mirror); 198 f->do_oop((oop*) &_void_mirror); 199 200 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 201 f->do_oop((oop*) &_mirrors[i]); 202 } 203 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 204 205 f->do_oop((oop*)&_the_empty_class_klass_array); 206 f->do_oop((oop*)&_the_null_string); 207 f->do_oop((oop*)&_the_min_jint_string); 208 f->do_oop((oop*)&_out_of_memory_error_java_heap); 209 f->do_oop((oop*)&_out_of_memory_error_metaspace); 210 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 211 f->do_oop((oop*)&_out_of_memory_error_array_size); 212 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 213 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 214 f->do_oop((oop*)&_delayed_stack_overflow_error_message); 215 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 216 f->do_oop((oop*)&_null_ptr_exception_instance); 217 f->do_oop((oop*)&_arithmetic_exception_instance); 218 f->do_oop((oop*)&_virtual_machine_error_instance); 219 f->do_oop((oop*)&_main_thread_group); 220 f->do_oop((oop*)&_system_thread_group); 221 f->do_oop((oop*)&_vm_exception); 222 f->do_oop((oop*)&_allocation_context_notification_obj); 223 f->do_oop((oop*)&_reference_pending_list); 224 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 225 } 226 227 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 228 it->push(&_klass); 229 } 230 231 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 232 it->push(&_boolArrayKlassObj); 233 it->push(&_byteArrayKlassObj); 234 it->push(&_charArrayKlassObj); 235 it->push(&_intArrayKlassObj); 236 it->push(&_shortArrayKlassObj); 237 it->push(&_longArrayKlassObj); 238 it->push(&_singleArrayKlassObj); 239 it->push(&_doubleArrayKlassObj); 240 for (int i = 0; i < T_VOID+1; i++) { 241 it->push(&_typeArrayKlassObjs[i]); 242 } 243 it->push(&_objectArrayKlassObj); 244 245 it->push(&_the_empty_int_array); 246 it->push(&_the_empty_short_array); 247 it->push(&_the_empty_klass_array); 248 it->push(&_the_empty_method_array); 249 it->push(&_the_array_interfaces_array); 250 251 _finalizer_register_cache->metaspace_pointers_do(it); 252 _loader_addClass_cache->metaspace_pointers_do(it); 253 _pd_implies_cache->metaspace_pointers_do(it); 254 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 255 _do_stack_walk_cache->metaspace_pointers_do(it); 256 } 257 258 // Serialize metadata in and out of CDS archive, not oops. 259 void Universe::serialize(SerializeClosure* f, bool do_all) { 260 261 f->do_ptr((void**)&_boolArrayKlassObj); 262 f->do_ptr((void**)&_byteArrayKlassObj); 263 f->do_ptr((void**)&_charArrayKlassObj); 264 f->do_ptr((void**)&_intArrayKlassObj); 265 f->do_ptr((void**)&_shortArrayKlassObj); 266 f->do_ptr((void**)&_longArrayKlassObj); 267 f->do_ptr((void**)&_singleArrayKlassObj); 268 f->do_ptr((void**)&_doubleArrayKlassObj); 269 f->do_ptr((void**)&_objectArrayKlassObj); 270 271 { 272 for (int i = 0; i < T_VOID+1; i++) { 273 if (_typeArrayKlassObjs[i] != NULL) { 274 assert(i >= T_BOOLEAN, "checking"); 275 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 276 } else if (do_all) { 277 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 278 } 279 } 280 } 281 282 f->do_ptr((void**)&_the_array_interfaces_array); 283 f->do_ptr((void**)&_the_empty_int_array); 284 f->do_ptr((void**)&_the_empty_short_array); 285 f->do_ptr((void**)&_the_empty_method_array); 286 f->do_ptr((void**)&_the_empty_klass_array); 287 _finalizer_register_cache->serialize(f); 288 _loader_addClass_cache->serialize(f); 289 _pd_implies_cache->serialize(f); 290 _throw_illegal_access_error_cache->serialize(f); 291 _do_stack_walk_cache->serialize(f); 292 } 293 294 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 295 if (size < alignment || size % alignment != 0) { 296 vm_exit_during_initialization( 297 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 298 } 299 } 300 301 void initialize_basic_type_klass(Klass* k, TRAPS) { 302 Klass* ok = SystemDictionary::Object_klass(); 303 #if INCLUDE_CDS 304 if (UseSharedSpaces) { 305 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 306 assert(k->super() == ok, "u3"); 307 k->restore_unshareable_info(loader_data, Handle(), CHECK); 308 } else 309 #endif 310 { 311 k->initialize_supers(ok, CHECK); 312 } 313 k->append_to_sibling_list(); 314 } 315 316 void Universe::genesis(TRAPS) { 317 ResourceMark rm; 318 319 { FlagSetting fs(_bootstrapping, true); 320 321 { MutexLocker mc(Compile_lock); 322 323 java_lang_Class::allocate_fixup_lists(); 324 325 // determine base vtable size; without that we cannot create the array klasses 326 compute_base_vtable_size(); 327 328 if (!UseSharedSpaces) { 329 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 330 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 331 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 332 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 333 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 334 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 335 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 336 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 337 338 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 339 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 340 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 341 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 342 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 343 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 344 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 345 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 346 347 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 348 349 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 350 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 351 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 352 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 353 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 354 } 355 } 356 357 vmSymbols::initialize(CHECK); 358 359 SystemDictionary::initialize(CHECK); 360 361 Klass* ok = SystemDictionary::Object_klass(); 362 363 _the_null_string = StringTable::intern("null", CHECK); 364 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 365 366 #if INCLUDE_CDS 367 if (UseSharedSpaces) { 368 // Verify shared interfaces array. 369 assert(_the_array_interfaces_array->at(0) == 370 SystemDictionary::Cloneable_klass(), "u3"); 371 assert(_the_array_interfaces_array->at(1) == 372 SystemDictionary::Serializable_klass(), "u3"); 373 MetaspaceShared::fixup_mapped_heap_regions(); 374 } else 375 #endif 376 { 377 // Set up shared interfaces array. (Do this before supers are set up.) 378 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 379 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 380 } 381 382 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 383 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 384 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 385 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 386 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 387 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 388 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 389 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 390 } // end of core bootstrapping 391 392 // Maybe this could be lifted up now that object array can be initialized 393 // during the bootstrapping. 394 395 // OLD 396 // Initialize _objectArrayKlass after core bootstraping to make 397 // sure the super class is set up properly for _objectArrayKlass. 398 // --- 399 // NEW 400 // Since some of the old system object arrays have been converted to 401 // ordinary object arrays, _objectArrayKlass will be loaded when 402 // SystemDictionary::initialize(CHECK); is run. See the extra check 403 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 404 _objectArrayKlassObj = InstanceKlass:: 405 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 406 // OLD 407 // Add the class to the class hierarchy manually to make sure that 408 // its vtable is initialized after core bootstrapping is completed. 409 // --- 410 // New 411 // Have already been initialized. 412 _objectArrayKlassObj->append_to_sibling_list(); 413 414 #ifdef ASSERT 415 if (FullGCALot) { 416 // Allocate an array of dummy objects. 417 // We'd like these to be at the bottom of the old generation, 418 // so that when we free one and then collect, 419 // (almost) the whole heap moves 420 // and we find out if we actually update all the oops correctly. 421 // But we can't allocate directly in the old generation, 422 // so we allocate wherever, and hope that the first collection 423 // moves these objects to the bottom of the old generation. 424 // We can allocate directly in the permanent generation, so we do. 425 int size; 426 if (UseConcMarkSweepGC) { 427 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate"); 428 size = FullGCALotDummies; 429 } else { 430 size = FullGCALotDummies * 2; 431 } 432 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 433 objArrayHandle dummy_array(THREAD, naked_array); 434 int i = 0; 435 while (i < size) { 436 // Allocate dummy in old generation 437 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 438 dummy_array->obj_at_put(i++, dummy); 439 } 440 { 441 // Only modify the global variable inside the mutex. 442 // If we had a race to here, the other dummy_array instances 443 // and their elements just get dropped on the floor, which is fine. 444 MutexLocker ml(FullGCALot_lock); 445 if (_fullgc_alot_dummy_array == NULL) { 446 _fullgc_alot_dummy_array = dummy_array(); 447 } 448 } 449 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 450 } 451 #endif 452 453 // Initialize dependency array for null class loader 454 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 455 456 } 457 458 void Universe::initialize_basic_type_mirrors(TRAPS) { 459 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 460 _int_mirror = 461 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 462 _float_mirror = 463 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 464 _double_mirror = 465 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 466 _byte_mirror = 467 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 468 _bool_mirror = 469 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 470 _char_mirror = 471 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 472 _long_mirror = 473 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 474 _short_mirror = 475 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 476 _void_mirror = 477 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 478 479 _mirrors[T_INT] = _int_mirror; 480 _mirrors[T_FLOAT] = _float_mirror; 481 _mirrors[T_DOUBLE] = _double_mirror; 482 _mirrors[T_BYTE] = _byte_mirror; 483 _mirrors[T_BOOLEAN] = _bool_mirror; 484 _mirrors[T_CHAR] = _char_mirror; 485 _mirrors[T_LONG] = _long_mirror; 486 _mirrors[T_SHORT] = _short_mirror; 487 _mirrors[T_VOID] = _void_mirror; 488 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 489 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 490 } 491 492 void Universe::fixup_mirrors(TRAPS) { 493 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 494 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 495 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 496 // that the number of objects allocated at this point is very small. 497 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 498 HandleMark hm(THREAD); 499 // Cache the start of the static fields 500 InstanceMirrorKlass::init_offset_of_static_fields(); 501 502 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 503 int list_length = list->length(); 504 for (int i = 0; i < list_length; i++) { 505 Klass* k = list->at(i); 506 assert(k->is_klass(), "List should only hold classes"); 507 EXCEPTION_MARK; 508 java_lang_Class::fixup_mirror(k, CATCH); 509 } 510 delete java_lang_Class::fixup_mirror_list(); 511 java_lang_Class::set_fixup_mirror_list(NULL); 512 } 513 514 #define assert_pll_locked(test) \ 515 assert(Heap_lock->test(), "Reference pending list access requires lock") 516 517 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 518 519 oop Universe::reference_pending_list() { 520 if (Thread::current()->is_VM_thread()) { 521 assert_pll_locked(is_locked); 522 } else { 523 assert_pll_ownership(); 524 } 525 return _reference_pending_list; 526 } 527 528 void Universe::set_reference_pending_list(oop list) { 529 assert_pll_ownership(); 530 _reference_pending_list = list; 531 } 532 533 bool Universe::has_reference_pending_list() { 534 assert_pll_ownership(); 535 return _reference_pending_list != NULL; 536 } 537 538 oop Universe::swap_reference_pending_list(oop list) { 539 assert_pll_locked(is_locked); 540 return Atomic::xchg(list, &_reference_pending_list); 541 } 542 543 #undef assert_pll_locked 544 #undef assert_pll_ownership 545 546 547 static bool has_run_finalizers_on_exit = false; 548 549 void Universe::run_finalizers_on_exit() { 550 if (has_run_finalizers_on_exit) return; 551 has_run_finalizers_on_exit = true; 552 553 // Called on VM exit. This ought to be run in a separate thread. 554 log_trace(ref)("Callback to run finalizers on exit"); 555 { 556 PRESERVE_EXCEPTION_MARK; 557 Klass* finalizer_klass = SystemDictionary::Finalizer_klass(); 558 JavaValue result(T_VOID); 559 JavaCalls::call_static( 560 &result, 561 finalizer_klass, 562 vmSymbols::run_finalizers_on_exit_name(), 563 vmSymbols::void_method_signature(), 564 THREAD 565 ); 566 // Ignore any pending exceptions 567 CLEAR_PENDING_EXCEPTION; 568 } 569 } 570 571 572 // initialize_vtable could cause gc if 573 // 1) we specified true to initialize_vtable and 574 // 2) this ran after gc was enabled 575 // In case those ever change we use handles for oops 576 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) { 577 // init vtable of k and all subclasses 578 ko->vtable().initialize_vtable(false, CHECK); 579 if (ko->is_instance_klass()) { 580 for (Klass* sk = ko->subklass(); 581 sk != NULL; 582 sk = sk->next_sibling()) { 583 reinitialize_vtable_of(sk, CHECK); 584 } 585 } 586 } 587 588 589 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) { 590 k->itable().initialize_itable(false, CHECK); 591 } 592 593 594 void Universe::reinitialize_itables(TRAPS) { 595 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK); 596 } 597 598 599 bool Universe::on_page_boundary(void* addr) { 600 return is_aligned(addr, os::vm_page_size()); 601 } 602 603 604 bool Universe::should_fill_in_stack_trace(Handle throwable) { 605 // never attempt to fill in the stack trace of preallocated errors that do not have 606 // backtrace. These errors are kept alive forever and may be "re-used" when all 607 // preallocated errors with backtrace have been consumed. Also need to avoid 608 // a potential loop which could happen if an out of memory occurs when attempting 609 // to allocate the backtrace. 610 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 611 (throwable() != Universe::_out_of_memory_error_metaspace) && 612 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 613 (throwable() != Universe::_out_of_memory_error_array_size) && 614 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) && 615 (throwable() != Universe::_out_of_memory_error_realloc_objects)); 616 } 617 618 619 oop Universe::gen_out_of_memory_error(oop default_err) { 620 // generate an out of memory error: 621 // - if there is a preallocated error and stack traces are available 622 // (j.l.Throwable is initialized), then return the preallocated 623 // error with a filled in stack trace, and with the message 624 // provided by the default error. 625 // - otherwise, return the default error, without a stack trace. 626 int next; 627 if ((_preallocated_out_of_memory_error_avail_count > 0) && 628 SystemDictionary::Throwable_klass()->is_initialized()) { 629 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 630 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 631 } else { 632 next = -1; 633 } 634 if (next < 0) { 635 // all preallocated errors have been used. 636 // return default 637 return default_err; 638 } else { 639 Thread* THREAD = Thread::current(); 640 Handle default_err_h(THREAD, default_err); 641 // get the error object at the slot and set set it to NULL so that the 642 // array isn't keeping it alive anymore. 643 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next)); 644 assert(exc() != NULL, "slot has been used already"); 645 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 646 647 // use the message from the default error 648 oop msg = java_lang_Throwable::message(default_err_h()); 649 assert(msg != NULL, "no message"); 650 java_lang_Throwable::set_message(exc(), msg); 651 652 // populate the stack trace and return it. 653 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 654 return exc(); 655 } 656 } 657 658 intptr_t Universe::_non_oop_bits = 0; 659 660 void* Universe::non_oop_word() { 661 // Neither the high bits nor the low bits of this value is allowed 662 // to look like (respectively) the high or low bits of a real oop. 663 // 664 // High and low are CPU-specific notions, but low always includes 665 // the low-order bit. Since oops are always aligned at least mod 4, 666 // setting the low-order bit will ensure that the low half of the 667 // word will never look like that of a real oop. 668 // 669 // Using the OS-supplied non-memory-address word (usually 0 or -1) 670 // will take care of the high bits, however many there are. 671 672 if (_non_oop_bits == 0) { 673 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 674 } 675 676 return (void*)_non_oop_bits; 677 } 678 679 jint universe_init() { 680 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 681 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 682 "LogHeapWordSize is incorrect."); 683 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 684 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 685 "oop size is not not a multiple of HeapWord size"); 686 687 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 688 689 JavaClasses::compute_hard_coded_offsets(); 690 691 jint status = Universe::initialize_heap(); 692 if (status != JNI_OK) { 693 return status; 694 } 695 696 Metaspace::global_initialize(); 697 698 AOTLoader::universe_init(); 699 700 // Checks 'AfterMemoryInit' constraints. 701 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) { 702 return JNI_EINVAL; 703 } 704 705 // Create memory for metadata. Must be after initializing heap for 706 // DumpSharedSpaces. 707 ClassLoaderData::init_null_class_loader_data(); 708 709 // We have a heap so create the Method* caches before 710 // Metaspace::initialize_shared_spaces() tries to populate them. 711 Universe::_finalizer_register_cache = new LatestMethodCache(); 712 Universe::_loader_addClass_cache = new LatestMethodCache(); 713 Universe::_pd_implies_cache = new LatestMethodCache(); 714 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 715 Universe::_do_stack_walk_cache = new LatestMethodCache(); 716 717 #if INCLUDE_CDS 718 if (UseSharedSpaces) { 719 // Read the data structures supporting the shared spaces (shared 720 // system dictionary, symbol table, etc.). After that, access to 721 // the file (other than the mapped regions) is no longer needed, and 722 // the file is closed. Closing the file does not affect the 723 // currently mapped regions. 724 MetaspaceShared::initialize_shared_spaces(); 725 StringTable::create_table(); 726 } else 727 #endif 728 { 729 SymbolTable::create_table(); 730 StringTable::create_table(); 731 732 #if INCLUDE_CDS 733 if (DumpSharedSpaces) { 734 MetaspaceShared::prepare_for_dumping(); 735 } 736 #endif 737 } 738 if (strlen(VerifySubSet) > 0) { 739 Universe::initialize_verify_flags(); 740 } 741 742 ResolvedMethodTable::create_table(); 743 744 return JNI_OK; 745 } 746 747 CollectedHeap* Universe::create_heap() { 748 assert(_collectedHeap == NULL, "Heap already created"); 749 #if !INCLUDE_ALL_GCS 750 if (UseParallelGC) { 751 fatal("UseParallelGC not supported in this VM."); 752 } else if (UseG1GC) { 753 fatal("UseG1GC not supported in this VM."); 754 } else if (UseConcMarkSweepGC) { 755 fatal("UseConcMarkSweepGC not supported in this VM."); 756 #else 757 if (UseParallelGC) { 758 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>(); 759 } else if (UseG1GC) { 760 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>(); 761 } else if (UseConcMarkSweepGC) { 762 return Universe::create_heap_with_policy<CMSHeap, ConcurrentMarkSweepPolicy>(); 763 #endif 764 } else if (UseSerialGC) { 765 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>(); 766 } 767 768 ShouldNotReachHere(); 769 return NULL; 770 } 771 772 // Choose the heap base address and oop encoding mode 773 // when compressed oops are used: 774 // Unscaled - Use 32-bits oops without encoding when 775 // NarrowOopHeapBaseMin + heap_size < 4Gb 776 // ZeroBased - Use zero based compressed oops with encoding when 777 // NarrowOopHeapBaseMin + heap_size < 32Gb 778 // HeapBased - Use compressed oops with heap base + encoding. 779 780 jint Universe::initialize_heap() { 781 jint status = JNI_ERR; 782 783 _collectedHeap = create_heap_ext(); 784 if (_collectedHeap == NULL) { 785 _collectedHeap = create_heap(); 786 } 787 788 status = _collectedHeap->initialize(); 789 if (status != JNI_OK) { 790 return status; 791 } 792 log_info(gc)("Using %s", _collectedHeap->name()); 793 794 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 795 796 #ifdef _LP64 797 if (UseCompressedOops) { 798 // Subtract a page because something can get allocated at heap base. 799 // This also makes implicit null checking work, because the 800 // memory+1 page below heap_base needs to cause a signal. 801 // See needs_explicit_null_check. 802 // Only set the heap base for compressed oops because it indicates 803 // compressed oops for pstack code. 804 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 805 // Didn't reserve heap below 4Gb. Must shift. 806 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 807 } 808 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 809 // Did reserve heap below 32Gb. Can use base == 0; 810 Universe::set_narrow_oop_base(0); 811 } 812 813 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 814 815 LogTarget(Info, gc, heap, coops) lt; 816 if (lt.is_enabled()) { 817 ResourceMark rm; 818 LogStream ls(lt); 819 Universe::print_compressed_oops_mode(&ls); 820 } 821 822 // Tell tests in which mode we run. 823 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 824 narrow_oop_mode_to_string(narrow_oop_mode()), 825 false)); 826 } 827 // Universe::narrow_oop_base() is one page below the heap. 828 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 829 os::vm_page_size()) || 830 Universe::narrow_oop_base() == NULL, "invalid value"); 831 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 832 Universe::narrow_oop_shift() == 0, "invalid value"); 833 #endif 834 835 // We will never reach the CATCH below since Exceptions::_throw will cause 836 // the VM to exit if an exception is thrown during initialization 837 838 if (UseTLAB) { 839 assert(Universe::heap()->supports_tlab_allocation(), 840 "Should support thread-local allocation buffers"); 841 ThreadLocalAllocBuffer::startup_initialization(); 842 } 843 return JNI_OK; 844 } 845 846 void Universe::print_compressed_oops_mode(outputStream* st) { 847 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 848 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 849 850 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 851 852 if (Universe::narrow_oop_base() != 0) { 853 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 854 } 855 856 if (Universe::narrow_oop_shift() != 0) { 857 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 858 } 859 860 if (!Universe::narrow_oop_use_implicit_null_checks()) { 861 st->print(", no protected page in front of the heap"); 862 } 863 st->cr(); 864 } 865 866 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 867 868 assert(alignment <= Arguments::conservative_max_heap_alignment(), 869 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 870 alignment, Arguments::conservative_max_heap_alignment()); 871 872 size_t total_reserved = align_up(heap_size, alignment); 873 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 874 "heap size is too big for compressed oops"); 875 876 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size()); 877 assert(!UseLargePages 878 || UseParallelGC 879 || use_large_pages, "Wrong alignment to use large pages"); 880 881 // Now create the space. 882 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages); 883 884 if (total_rs.is_reserved()) { 885 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 886 "must be exactly of required size and alignment"); 887 // We are good. 888 889 if (UseCompressedOops) { 890 // Universe::initialize_heap() will reset this to NULL if unscaled 891 // or zero-based narrow oops are actually used. 892 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 893 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 894 } 895 896 return total_rs; 897 } 898 899 vm_exit_during_initialization( 900 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 901 total_reserved/K)); 902 903 // satisfy compiler 904 ShouldNotReachHere(); 905 return ReservedHeapSpace(0, 0, false); 906 } 907 908 909 // It's the caller's responsibility to ensure glitch-freedom 910 // (if required). 911 void Universe::update_heap_info_at_gc() { 912 _heap_capacity_at_last_gc = heap()->capacity(); 913 _heap_used_at_last_gc = heap()->used(); 914 } 915 916 917 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 918 switch (mode) { 919 case UnscaledNarrowOop: 920 return "32-bit"; 921 case ZeroBasedNarrowOop: 922 return "Zero based"; 923 case DisjointBaseNarrowOop: 924 return "Non-zero disjoint base"; 925 case HeapBasedNarrowOop: 926 return "Non-zero based"; 927 default: 928 ShouldNotReachHere(); 929 return ""; 930 } 931 } 932 933 934 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 935 if (narrow_oop_base_disjoint()) { 936 return DisjointBaseNarrowOop; 937 } 938 939 if (narrow_oop_base() != 0) { 940 return HeapBasedNarrowOop; 941 } 942 943 if (narrow_oop_shift() != 0) { 944 return ZeroBasedNarrowOop; 945 } 946 947 return UnscaledNarrowOop; 948 } 949 950 void initialize_known_method(LatestMethodCache* method_cache, 951 InstanceKlass* ik, 952 const char* method, 953 Symbol* signature, 954 bool is_static, TRAPS) 955 { 956 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK); 957 Method* m = NULL; 958 // The klass must be linked before looking up the method. 959 if (!ik->link_class_or_fail(THREAD) || 960 ((m = ik->find_method(name, signature)) == NULL) || 961 is_static != m->is_static()) { 962 ResourceMark rm(THREAD); 963 // NoSuchMethodException doesn't actually work because it tries to run the 964 // <init> function before java_lang_Class is linked. Print error and exit. 965 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 966 ik->name()->as_C_string(), method)); 967 } 968 method_cache->init(ik, m); 969 } 970 971 void Universe::initialize_known_methods(TRAPS) { 972 // Set up static method for registering finalizers 973 initialize_known_method(_finalizer_register_cache, 974 SystemDictionary::Finalizer_klass(), 975 "register", 976 vmSymbols::object_void_signature(), true, CHECK); 977 978 initialize_known_method(_throw_illegal_access_error_cache, 979 SystemDictionary::internal_Unsafe_klass(), 980 "throwIllegalAccessError", 981 vmSymbols::void_method_signature(), true, CHECK); 982 983 // Set up method for registering loaded classes in class loader vector 984 initialize_known_method(_loader_addClass_cache, 985 SystemDictionary::ClassLoader_klass(), 986 "addClass", 987 vmSymbols::class_void_signature(), false, CHECK); 988 989 // Set up method for checking protection domain 990 initialize_known_method(_pd_implies_cache, 991 SystemDictionary::ProtectionDomain_klass(), 992 "impliesCreateAccessControlContext", 993 vmSymbols::void_boolean_signature(), false, CHECK); 994 995 // Set up method for stack walking 996 initialize_known_method(_do_stack_walk_cache, 997 SystemDictionary::AbstractStackWalker_klass(), 998 "doStackWalk", 999 vmSymbols::doStackWalk_signature(), false, CHECK); 1000 } 1001 1002 void universe2_init() { 1003 EXCEPTION_MARK; 1004 Universe::genesis(CATCH); 1005 } 1006 1007 // Set after initialization of the module runtime, call_initModuleRuntime 1008 void universe_post_module_init() { 1009 Universe::_module_initialized = true; 1010 } 1011 1012 bool universe_post_init() { 1013 assert(!is_init_completed(), "Error: initialization not yet completed!"); 1014 Universe::_fully_initialized = true; 1015 EXCEPTION_MARK; 1016 { ResourceMark rm; 1017 Interpreter::initialize(); // needed for interpreter entry points 1018 if (!UseSharedSpaces) { 1019 HandleMark hm(THREAD); 1020 Klass* ok = SystemDictionary::Object_klass(); 1021 Universe::reinitialize_vtable_of(ok, CHECK_false); 1022 Universe::reinitialize_itables(CHECK_false); 1023 } 1024 } 1025 1026 HandleMark hm(THREAD); 1027 // Setup preallocated empty java.lang.Class array 1028 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 1029 1030 // Setup preallocated OutOfMemoryError errors 1031 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 1032 InstanceKlass* ik = InstanceKlass::cast(k); 1033 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false); 1034 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false); 1035 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false); 1036 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false); 1037 Universe::_out_of_memory_error_gc_overhead_limit = 1038 ik->allocate_instance(CHECK_false); 1039 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false); 1040 1041 // Setup preallocated cause message for delayed StackOverflowError 1042 if (StackReservedPages > 0) { 1043 Universe::_delayed_stack_overflow_error_message = 1044 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1045 } 1046 1047 // Setup preallocated NullPointerException 1048 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1049 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1050 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1051 // Setup preallocated ArithmeticException 1052 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1053 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1054 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1055 // Virtual Machine Error for when we get into a situation we can't resolve 1056 k = SystemDictionary::resolve_or_fail( 1057 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1058 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1059 if (!linked) { 1060 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1061 return false; // initialization failed 1062 } 1063 Universe::_virtual_machine_error_instance = 1064 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1065 1066 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1067 1068 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1069 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1070 1071 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 1072 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1073 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 1074 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1075 1076 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1077 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1078 1079 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1080 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1081 1082 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 1083 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 1084 1085 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1086 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1087 1088 // Setup the array of errors that have preallocated backtrace 1089 k = Universe::_out_of_memory_error_java_heap->klass(); 1090 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1091 ik = InstanceKlass::cast(k); 1092 1093 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1094 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false); 1095 for (int i=0; i<len; i++) { 1096 oop err = ik->allocate_instance(CHECK_false); 1097 Handle err_h = Handle(THREAD, err); 1098 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1099 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1100 } 1101 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1102 1103 Universe::initialize_known_methods(CHECK_false); 1104 1105 // This needs to be done before the first scavenge/gc, since 1106 // it's an input to soft ref clearing policy. 1107 { 1108 MutexLocker x(Heap_lock); 1109 Universe::update_heap_info_at_gc(); 1110 } 1111 1112 // ("weak") refs processing infrastructure initialization 1113 Universe::heap()->post_initialize(); 1114 1115 // Initialize performance counters for metaspaces 1116 MetaspaceCounters::initialize_performance_counters(); 1117 CompressedClassSpaceCounters::initialize_performance_counters(); 1118 1119 MemoryService::add_metaspace_memory_pools(); 1120 1121 MemoryService::set_universe_heap(Universe::heap()); 1122 #if INCLUDE_CDS 1123 SharedClassUtil::initialize(CHECK_false); 1124 #endif 1125 return true; 1126 } 1127 1128 1129 void Universe::compute_base_vtable_size() { 1130 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1131 } 1132 1133 void Universe::print_on(outputStream* st) { 1134 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1135 st->print_cr("Heap"); 1136 heap()->print_on(st); 1137 } 1138 1139 void Universe::print_heap_at_SIGBREAK() { 1140 if (PrintHeapAtSIGBREAK) { 1141 print_on(tty); 1142 tty->cr(); 1143 tty->flush(); 1144 } 1145 } 1146 1147 void Universe::print_heap_before_gc() { 1148 LogTarget(Debug, gc, heap) lt; 1149 if (lt.is_enabled()) { 1150 LogStream ls(lt); 1151 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1152 ResourceMark rm; 1153 heap()->print_on(&ls); 1154 } 1155 } 1156 1157 void Universe::print_heap_after_gc() { 1158 LogTarget(Debug, gc, heap) lt; 1159 if (lt.is_enabled()) { 1160 LogStream ls(lt); 1161 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1162 ResourceMark rm; 1163 heap()->print_on(&ls); 1164 } 1165 } 1166 1167 void Universe::initialize_verify_flags() { 1168 verify_flags = 0; 1169 const char delimiter[] = " ,"; 1170 1171 size_t length = strlen(VerifySubSet); 1172 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1173 strncpy(subset_list, VerifySubSet, length + 1); 1174 1175 char* token = strtok(subset_list, delimiter); 1176 while (token != NULL) { 1177 if (strcmp(token, "threads") == 0) { 1178 verify_flags |= Verify_Threads; 1179 } else if (strcmp(token, "heap") == 0) { 1180 verify_flags |= Verify_Heap; 1181 } else if (strcmp(token, "symbol_table") == 0) { 1182 verify_flags |= Verify_SymbolTable; 1183 } else if (strcmp(token, "string_table") == 0) { 1184 verify_flags |= Verify_StringTable; 1185 } else if (strcmp(token, "codecache") == 0) { 1186 verify_flags |= Verify_CodeCache; 1187 } else if (strcmp(token, "dictionary") == 0) { 1188 verify_flags |= Verify_SystemDictionary; 1189 } else if (strcmp(token, "classloader_data_graph") == 0) { 1190 verify_flags |= Verify_ClassLoaderDataGraph; 1191 } else if (strcmp(token, "metaspace") == 0) { 1192 verify_flags |= Verify_MetaspaceAux; 1193 } else if (strcmp(token, "jni_handles") == 0) { 1194 verify_flags |= Verify_JNIHandles; 1195 } else if (strcmp(token, "codecache_oops") == 0) { 1196 verify_flags |= Verify_CodeCacheOops; 1197 } else { 1198 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1199 } 1200 token = strtok(NULL, delimiter); 1201 } 1202 FREE_C_HEAP_ARRAY(char, subset_list); 1203 } 1204 1205 bool Universe::should_verify_subset(uint subset) { 1206 if (verify_flags & subset) { 1207 return true; 1208 } 1209 return false; 1210 } 1211 1212 void Universe::verify(VerifyOption option, const char* prefix) { 1213 // The use of _verify_in_progress is a temporary work around for 1214 // 6320749. Don't bother with a creating a class to set and clear 1215 // it since it is only used in this method and the control flow is 1216 // straight forward. 1217 _verify_in_progress = true; 1218 1219 COMPILER2_PRESENT( 1220 assert(!DerivedPointerTable::is_active(), 1221 "DPT should not be active during verification " 1222 "(of thread stacks below)"); 1223 ) 1224 1225 ResourceMark rm; 1226 HandleMark hm; // Handles created during verification can be zapped 1227 _verify_count++; 1228 1229 FormatBuffer<> title("Verifying %s", prefix); 1230 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1231 if (should_verify_subset(Verify_Threads)) { 1232 log_debug(gc, verify)("Threads"); 1233 Threads::verify(); 1234 } 1235 if (should_verify_subset(Verify_Heap)) { 1236 log_debug(gc, verify)("Heap"); 1237 heap()->verify(option); 1238 } 1239 if (should_verify_subset(Verify_SymbolTable)) { 1240 log_debug(gc, verify)("SymbolTable"); 1241 SymbolTable::verify(); 1242 } 1243 if (should_verify_subset(Verify_StringTable)) { 1244 log_debug(gc, verify)("StringTable"); 1245 StringTable::verify(); 1246 } 1247 if (should_verify_subset(Verify_CodeCache)) { 1248 { 1249 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1250 log_debug(gc, verify)("CodeCache"); 1251 CodeCache::verify(); 1252 } 1253 } 1254 if (should_verify_subset(Verify_SystemDictionary)) { 1255 log_debug(gc, verify)("SystemDictionary"); 1256 SystemDictionary::verify(); 1257 } 1258 #ifndef PRODUCT 1259 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1260 log_debug(gc, verify)("ClassLoaderDataGraph"); 1261 ClassLoaderDataGraph::verify(); 1262 } 1263 #endif 1264 if (should_verify_subset(Verify_MetaspaceAux)) { 1265 log_debug(gc, verify)("MetaspaceAux"); 1266 MetaspaceAux::verify_free_chunks(); 1267 } 1268 if (should_verify_subset(Verify_JNIHandles)) { 1269 log_debug(gc, verify)("JNIHandles"); 1270 JNIHandles::verify(); 1271 } 1272 if (should_verify_subset(Verify_CodeCacheOops)) { 1273 log_debug(gc, verify)("CodeCache Oops"); 1274 CodeCache::verify_oops(); 1275 } 1276 1277 _verify_in_progress = false; 1278 } 1279 1280 1281 #ifndef PRODUCT 1282 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1283 assert(low_boundary < high_boundary, "bad interval"); 1284 1285 // decide which low-order bits we require to be clear: 1286 size_t alignSize = MinObjAlignmentInBytes; 1287 size_t min_object_size = CollectedHeap::min_fill_size(); 1288 1289 // make an inclusive limit: 1290 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1291 uintptr_t min = (uintptr_t)low_boundary; 1292 assert(min < max, "bad interval"); 1293 uintptr_t diff = max ^ min; 1294 1295 // throw away enough low-order bits to make the diff vanish 1296 uintptr_t mask = (uintptr_t)(-1); 1297 while ((mask & diff) != 0) 1298 mask <<= 1; 1299 uintptr_t bits = (min & mask); 1300 assert(bits == (max & mask), "correct mask"); 1301 // check an intermediate value between min and max, just to make sure: 1302 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1303 1304 // require address alignment, too: 1305 mask |= (alignSize - 1); 1306 1307 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1308 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1309 } 1310 _verify_oop_mask = mask; 1311 _verify_oop_bits = bits; 1312 } 1313 1314 // Oop verification (see MacroAssembler::verify_oop) 1315 1316 uintptr_t Universe::verify_oop_mask() { 1317 MemRegion m = heap()->reserved_region(); 1318 calculate_verify_data(m.start(), m.end()); 1319 return _verify_oop_mask; 1320 } 1321 1322 uintptr_t Universe::verify_oop_bits() { 1323 MemRegion m = heap()->reserved_region(); 1324 calculate_verify_data(m.start(), m.end()); 1325 return _verify_oop_bits; 1326 } 1327 1328 uintptr_t Universe::verify_mark_mask() { 1329 return markOopDesc::lock_mask_in_place; 1330 } 1331 1332 uintptr_t Universe::verify_mark_bits() { 1333 intptr_t mask = verify_mark_mask(); 1334 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1335 assert((bits & ~mask) == 0, "no stray header bits"); 1336 return bits; 1337 } 1338 #endif // PRODUCT 1339 1340 1341 void Universe::compute_verify_oop_data() { 1342 verify_oop_mask(); 1343 verify_oop_bits(); 1344 verify_mark_mask(); 1345 verify_mark_bits(); 1346 } 1347 1348 1349 void LatestMethodCache::init(Klass* k, Method* m) { 1350 if (!UseSharedSpaces) { 1351 _klass = k; 1352 } 1353 #ifndef PRODUCT 1354 else { 1355 // sharing initilization should have already set up _klass 1356 assert(_klass != NULL, "just checking"); 1357 } 1358 #endif 1359 1360 _method_idnum = m->method_idnum(); 1361 assert(_method_idnum >= 0, "sanity check"); 1362 } 1363 1364 1365 Method* LatestMethodCache::get_method() { 1366 if (klass() == NULL) return NULL; 1367 InstanceKlass* ik = InstanceKlass::cast(klass()); 1368 Method* m = ik->method_with_idnum(method_idnum()); 1369 assert(m != NULL, "sanity check"); 1370 return m; 1371 } 1372 1373 1374 #ifdef ASSERT 1375 // Release dummy object(s) at bottom of heap 1376 bool Universe::release_fullgc_alot_dummy() { 1377 MutexLocker ml(FullGCALot_lock); 1378 if (_fullgc_alot_dummy_array != NULL) { 1379 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1380 // No more dummies to release, release entire array instead 1381 _fullgc_alot_dummy_array = NULL; 1382 return false; 1383 } 1384 if (!UseConcMarkSweepGC) { 1385 // Release dummy at bottom of old generation 1386 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1387 } 1388 // Release dummy at bottom of permanent generation 1389 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1390 } 1391 return true; 1392 } 1393 1394 #endif // ASSERT