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