1 /* 2 * Copyright (c) 1997, 2016, 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 "classfile/classLoader.hpp" 27 #include "classfile/classLoaderData.hpp" 28 #include "classfile/javaClasses.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "code/codeCache.hpp" 33 #include "code/dependencies.hpp" 34 #include "gc/shared/cardTableModRefBS.hpp" 35 #include "gc/shared/collectedHeap.inline.hpp" 36 #include "gc/shared/gcLocker.inline.hpp" 37 #include "gc/shared/genCollectedHeap.hpp" 38 #include "gc/shared/generation.hpp" 39 #include "gc/shared/gcTraceTime.inline.hpp" 40 #include "gc/shared/space.hpp" 41 #include "interpreter/interpreter.hpp" 42 #include "logging/log.hpp" 43 #include "memory/filemap.hpp" 44 #include "memory/metadataFactory.hpp" 45 #include "memory/metaspaceShared.hpp" 46 #include "memory/oopFactory.hpp" 47 #include "memory/resourceArea.hpp" 48 #include "memory/universe.hpp" 49 #include "memory/universe.inline.hpp" 50 #include "oops/constantPool.hpp" 51 #include "oops/instanceClassLoaderKlass.hpp" 52 #include "oops/instanceKlass.hpp" 53 #include "oops/instanceMirrorKlass.hpp" 54 #include "oops/instanceRefKlass.hpp" 55 #include "oops/objArrayOop.inline.hpp" 56 #include "oops/oop.inline.hpp" 57 #include "oops/typeArrayKlass.hpp" 58 #include "runtime/arguments.hpp" 59 #include "runtime/atomic.hpp" 60 #include "runtime/commandLineFlagConstraintList.hpp" 61 #include "runtime/deoptimization.hpp" 62 #include "runtime/fprofiler.hpp" 63 #include "runtime/handles.inline.hpp" 64 #include "runtime/init.hpp" 65 #include "runtime/java.hpp" 66 #include "runtime/javaCalls.hpp" 67 #include "runtime/sharedRuntime.hpp" 68 #include "runtime/synchronizer.hpp" 69 #include "runtime/thread.inline.hpp" 70 #include "runtime/timerTrace.hpp" 71 #include "runtime/vm_operations.hpp" 72 #include "services/memoryService.hpp" 73 #include "utilities/copy.hpp" 74 #include "utilities/events.hpp" 75 #include "utilities/hashtable.inline.hpp" 76 #include "utilities/macros.hpp" 77 #include "utilities/ostream.hpp" 78 #include "utilities/preserveException.hpp" 79 #if INCLUDE_ALL_GCS 80 #include "gc/cms/cmsCollectorPolicy.hpp" 81 #include "gc/g1/g1CollectedHeap.inline.hpp" 82 #include "gc/g1/g1CollectorPolicy.hpp" 83 #include "gc/parallel/parallelScavengeHeap.hpp" 84 #include "gc/shared/adaptiveSizePolicy.hpp" 85 #endif // INCLUDE_ALL_GCS 86 #if INCLUDE_CDS 87 #include "classfile/sharedClassUtil.hpp" 88 #endif 89 90 // Known objects 91 Klass* Universe::_boolArrayKlassObj = NULL; 92 Klass* Universe::_byteArrayKlassObj = NULL; 93 Klass* Universe::_charArrayKlassObj = NULL; 94 Klass* Universe::_intArrayKlassObj = NULL; 95 Klass* Universe::_shortArrayKlassObj = NULL; 96 Klass* Universe::_longArrayKlassObj = NULL; 97 Klass* Universe::_singleArrayKlassObj = NULL; 98 Klass* Universe::_doubleArrayKlassObj = NULL; 99 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 100 Klass* Universe::_objectArrayKlassObj = NULL; 101 oop Universe::_int_mirror = NULL; 102 oop Universe::_float_mirror = NULL; 103 oop Universe::_double_mirror = NULL; 104 oop Universe::_byte_mirror = NULL; 105 oop Universe::_bool_mirror = NULL; 106 oop Universe::_char_mirror = NULL; 107 oop Universe::_long_mirror = NULL; 108 oop Universe::_short_mirror = NULL; 109 oop Universe::_void_mirror = NULL; 110 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 111 oop Universe::_main_thread_group = NULL; 112 oop Universe::_system_thread_group = NULL; 113 objArrayOop Universe::_the_empty_class_klass_array = NULL; 114 Array<Klass*>* Universe::_the_array_interfaces_array = 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 void Universe::basic_type_classes_do(void f(Klass*)) { 171 f(boolArrayKlassObj()); 172 f(byteArrayKlassObj()); 173 f(charArrayKlassObj()); 174 f(intArrayKlassObj()); 175 f(shortArrayKlassObj()); 176 f(longArrayKlassObj()); 177 f(singleArrayKlassObj()); 178 f(doubleArrayKlassObj()); 179 } 180 181 void Universe::oops_do(OopClosure* f, bool do_all) { 182 183 f->do_oop((oop*) &_int_mirror); 184 f->do_oop((oop*) &_float_mirror); 185 f->do_oop((oop*) &_double_mirror); 186 f->do_oop((oop*) &_byte_mirror); 187 f->do_oop((oop*) &_bool_mirror); 188 f->do_oop((oop*) &_char_mirror); 189 f->do_oop((oop*) &_long_mirror); 190 f->do_oop((oop*) &_short_mirror); 191 f->do_oop((oop*) &_void_mirror); 192 193 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 194 f->do_oop((oop*) &_mirrors[i]); 195 } 196 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 197 198 f->do_oop((oop*)&_the_empty_class_klass_array); 199 f->do_oop((oop*)&_the_null_string); 200 f->do_oop((oop*)&_the_min_jint_string); 201 f->do_oop((oop*)&_out_of_memory_error_java_heap); 202 f->do_oop((oop*)&_out_of_memory_error_metaspace); 203 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 204 f->do_oop((oop*)&_out_of_memory_error_array_size); 205 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 206 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 207 f->do_oop((oop*)&_delayed_stack_overflow_error_message); 208 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 209 f->do_oop((oop*)&_null_ptr_exception_instance); 210 f->do_oop((oop*)&_arithmetic_exception_instance); 211 f->do_oop((oop*)&_virtual_machine_error_instance); 212 f->do_oop((oop*)&_main_thread_group); 213 f->do_oop((oop*)&_system_thread_group); 214 f->do_oop((oop*)&_vm_exception); 215 f->do_oop((oop*)&_allocation_context_notification_obj); 216 f->do_oop((oop*)&_reference_pending_list); 217 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 218 } 219 220 // Serialize metadata in and out of CDS archive, not oops. 221 void Universe::serialize(SerializeClosure* f, bool do_all) { 222 223 f->do_ptr((void**)&_boolArrayKlassObj); 224 f->do_ptr((void**)&_byteArrayKlassObj); 225 f->do_ptr((void**)&_charArrayKlassObj); 226 f->do_ptr((void**)&_intArrayKlassObj); 227 f->do_ptr((void**)&_shortArrayKlassObj); 228 f->do_ptr((void**)&_longArrayKlassObj); 229 f->do_ptr((void**)&_singleArrayKlassObj); 230 f->do_ptr((void**)&_doubleArrayKlassObj); 231 f->do_ptr((void**)&_objectArrayKlassObj); 232 233 { 234 for (int i = 0; i < T_VOID+1; i++) { 235 if (_typeArrayKlassObjs[i] != NULL) { 236 assert(i >= T_BOOLEAN, "checking"); 237 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 238 } else if (do_all) { 239 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 240 } 241 } 242 } 243 244 f->do_ptr((void**)&_the_array_interfaces_array); 245 f->do_ptr((void**)&_the_empty_int_array); 246 f->do_ptr((void**)&_the_empty_short_array); 247 f->do_ptr((void**)&_the_empty_method_array); 248 f->do_ptr((void**)&_the_empty_klass_array); 249 _finalizer_register_cache->serialize(f); 250 _loader_addClass_cache->serialize(f); 251 _pd_implies_cache->serialize(f); 252 _throw_illegal_access_error_cache->serialize(f); 253 _do_stack_walk_cache->serialize(f); 254 } 255 256 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 257 if (size < alignment || size % alignment != 0) { 258 vm_exit_during_initialization( 259 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 260 } 261 } 262 263 void initialize_basic_type_klass(Klass* k, TRAPS) { 264 Klass* ok = SystemDictionary::Object_klass(); 265 if (UseSharedSpaces) { 266 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 267 assert(k->super() == ok, "u3"); 268 k->restore_unshareable_info(loader_data, Handle(), CHECK); 269 } else { 270 k->initialize_supers(ok, CHECK); 271 } 272 k->append_to_sibling_list(); 273 } 274 275 void Universe::genesis(TRAPS) { 276 ResourceMark rm; 277 278 { FlagSetting fs(_bootstrapping, true); 279 280 { MutexLocker mc(Compile_lock); 281 282 // determine base vtable size; without that we cannot create the array klasses 283 compute_base_vtable_size(); 284 285 if (!UseSharedSpaces) { 286 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 287 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 288 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 289 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 290 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 291 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 292 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 293 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 294 295 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 296 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 297 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 298 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 299 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 300 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 301 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 302 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 303 304 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 305 306 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 307 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 308 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 309 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 310 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 311 } 312 } 313 314 vmSymbols::initialize(CHECK); 315 316 SystemDictionary::initialize(CHECK); 317 318 Klass* ok = SystemDictionary::Object_klass(); 319 320 _the_null_string = StringTable::intern("null", CHECK); 321 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 322 323 if (UseSharedSpaces) { 324 // Verify shared interfaces array. 325 assert(_the_array_interfaces_array->at(0) == 326 SystemDictionary::Cloneable_klass(), "u3"); 327 assert(_the_array_interfaces_array->at(1) == 328 SystemDictionary::Serializable_klass(), "u3"); 329 MetaspaceShared::fixup_shared_string_regions(); 330 } else { 331 // Set up shared interfaces array. (Do this before supers are set up.) 332 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 333 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 334 } 335 336 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 337 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 338 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 339 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 340 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 341 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 342 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 343 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 344 } // end of core bootstrapping 345 346 // Maybe this could be lifted up now that object array can be initialized 347 // during the bootstrapping. 348 349 // OLD 350 // Initialize _objectArrayKlass after core bootstraping to make 351 // sure the super class is set up properly for _objectArrayKlass. 352 // --- 353 // NEW 354 // Since some of the old system object arrays have been converted to 355 // ordinary object arrays, _objectArrayKlass will be loaded when 356 // SystemDictionary::initialize(CHECK); is run. See the extra check 357 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 358 _objectArrayKlassObj = InstanceKlass:: 359 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 360 // OLD 361 // Add the class to the class hierarchy manually to make sure that 362 // its vtable is initialized after core bootstrapping is completed. 363 // --- 364 // New 365 // Have already been initialized. 366 _objectArrayKlassObj->append_to_sibling_list(); 367 368 #ifdef ASSERT 369 if (FullGCALot) { 370 // Allocate an array of dummy objects. 371 // We'd like these to be at the bottom of the old generation, 372 // so that when we free one and then collect, 373 // (almost) the whole heap moves 374 // and we find out if we actually update all the oops correctly. 375 // But we can't allocate directly in the old generation, 376 // so we allocate wherever, and hope that the first collection 377 // moves these objects to the bottom of the old generation. 378 // We can allocate directly in the permanent generation, so we do. 379 int size; 380 if (UseConcMarkSweepGC) { 381 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate"); 382 size = FullGCALotDummies; 383 } else { 384 size = FullGCALotDummies * 2; 385 } 386 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 387 objArrayHandle dummy_array(THREAD, naked_array); 388 int i = 0; 389 while (i < size) { 390 // Allocate dummy in old generation 391 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 392 dummy_array->obj_at_put(i++, dummy); 393 } 394 { 395 // Only modify the global variable inside the mutex. 396 // If we had a race to here, the other dummy_array instances 397 // and their elements just get dropped on the floor, which is fine. 398 MutexLocker ml(FullGCALot_lock); 399 if (_fullgc_alot_dummy_array == NULL) { 400 _fullgc_alot_dummy_array = dummy_array(); 401 } 402 } 403 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 404 } 405 #endif 406 407 // Initialize dependency array for null class loader 408 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 409 410 } 411 412 // CDS support for patching vtables in metadata in the shared archive. 413 // All types inherited from Metadata have vtables, but not types inherited 414 // from MetaspaceObj, because the latter does not have virtual functions. 415 // If the metadata type has a vtable, it cannot be shared in the read-only 416 // section of the CDS archive, because the vtable pointer is patched. 417 static inline void add_vtable(void** list, int* n, void* o, int count) { 418 guarantee((*n) < count, "vtable list too small"); 419 void* vtable = dereference_vptr(o); 420 assert(*(void**)(vtable) != NULL, "invalid vtable"); 421 list[(*n)++] = vtable; 422 } 423 424 void Universe::init_self_patching_vtbl_list(void** list, int count) { 425 int n = 0; 426 { InstanceKlass o; add_vtable(list, &n, &o, count); } 427 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 428 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 429 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 430 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 431 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 432 { Method o; add_vtable(list, &n, &o, count); } 433 { ConstantPool o; add_vtable(list, &n, &o, count); } 434 } 435 436 void Universe::initialize_basic_type_mirrors(TRAPS) { 437 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 438 _int_mirror = 439 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 440 _float_mirror = 441 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 442 _double_mirror = 443 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 444 _byte_mirror = 445 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 446 _bool_mirror = 447 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 448 _char_mirror = 449 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 450 _long_mirror = 451 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 452 _short_mirror = 453 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 454 _void_mirror = 455 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 456 457 _mirrors[T_INT] = _int_mirror; 458 _mirrors[T_FLOAT] = _float_mirror; 459 _mirrors[T_DOUBLE] = _double_mirror; 460 _mirrors[T_BYTE] = _byte_mirror; 461 _mirrors[T_BOOLEAN] = _bool_mirror; 462 _mirrors[T_CHAR] = _char_mirror; 463 _mirrors[T_LONG] = _long_mirror; 464 _mirrors[T_SHORT] = _short_mirror; 465 _mirrors[T_VOID] = _void_mirror; 466 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 467 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 468 } 469 470 void Universe::fixup_mirrors(TRAPS) { 471 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 472 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 473 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 474 // that the number of objects allocated at this point is very small. 475 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 476 HandleMark hm(THREAD); 477 // Cache the start of the static fields 478 InstanceMirrorKlass::init_offset_of_static_fields(); 479 480 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 481 int list_length = list->length(); 482 for (int i = 0; i < list_length; i++) { 483 Klass* k = list->at(i); 484 assert(k->is_klass(), "List should only hold classes"); 485 EXCEPTION_MARK; 486 KlassHandle kh(THREAD, k); 487 java_lang_Class::fixup_mirror(kh, CATCH); 488 } 489 delete java_lang_Class::fixup_mirror_list(); 490 java_lang_Class::set_fixup_mirror_list(NULL); 491 } 492 493 #define assert_pll_locked(test) \ 494 assert(Heap_lock->test(), "Reference pending list access requires lock") 495 496 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 497 498 oop Universe::reference_pending_list() { 499 assert_pll_ownership(); 500 return _reference_pending_list; 501 } 502 503 void Universe::set_reference_pending_list(oop list) { 504 assert_pll_ownership(); 505 _reference_pending_list = list; 506 } 507 508 bool Universe::has_reference_pending_list() { 509 assert_pll_ownership(); 510 return _reference_pending_list != NULL; 511 } 512 513 oop Universe::swap_reference_pending_list(oop list) { 514 assert_pll_locked(is_locked); 515 return (oop)Atomic::xchg_ptr(list, &_reference_pending_list); 516 } 517 518 #undef assert_pll_locked 519 #undef assert_pll_ownership 520 521 522 static bool has_run_finalizers_on_exit = false; 523 524 void Universe::run_finalizers_on_exit() { 525 if (has_run_finalizers_on_exit) return; 526 has_run_finalizers_on_exit = true; 527 528 // Called on VM exit. This ought to be run in a separate thread. 529 log_trace(ref)("Callback to run finalizers on exit"); 530 { 531 PRESERVE_EXCEPTION_MARK; 532 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 533 JavaValue result(T_VOID); 534 JavaCalls::call_static( 535 &result, 536 finalizer_klass, 537 vmSymbols::run_finalizers_on_exit_name(), 538 vmSymbols::void_method_signature(), 539 THREAD 540 ); 541 // Ignore any pending exceptions 542 CLEAR_PENDING_EXCEPTION; 543 } 544 } 545 546 547 // initialize_vtable could cause gc if 548 // 1) we specified true to initialize_vtable and 549 // 2) this ran after gc was enabled 550 // In case those ever change we use handles for oops 551 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 552 // init vtable of k and all subclasses 553 Klass* ko = k_h(); 554 klassVtable* vt = ko->vtable(); 555 if (vt) vt->initialize_vtable(false, CHECK); 556 if (ko->is_instance_klass()) { 557 for (KlassHandle s_h(THREAD, ko->subklass()); 558 s_h() != NULL; 559 s_h = KlassHandle(THREAD, s_h()->next_sibling())) { 560 reinitialize_vtable_of(s_h, CHECK); 561 } 562 } 563 } 564 565 566 void initialize_itable_for_klass(Klass* k, TRAPS) { 567 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 568 } 569 570 571 void Universe::reinitialize_itables(TRAPS) { 572 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 573 574 } 575 576 577 bool Universe::on_page_boundary(void* addr) { 578 return ((uintptr_t) addr) % os::vm_page_size() == 0; 579 } 580 581 582 bool Universe::should_fill_in_stack_trace(Handle throwable) { 583 // never attempt to fill in the stack trace of preallocated errors that do not have 584 // backtrace. These errors are kept alive forever and may be "re-used" when all 585 // preallocated errors with backtrace have been consumed. Also need to avoid 586 // a potential loop which could happen if an out of memory occurs when attempting 587 // to allocate the backtrace. 588 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 589 (throwable() != Universe::_out_of_memory_error_metaspace) && 590 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 591 (throwable() != Universe::_out_of_memory_error_array_size) && 592 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) && 593 (throwable() != Universe::_out_of_memory_error_realloc_objects)); 594 } 595 596 597 oop Universe::gen_out_of_memory_error(oop default_err) { 598 // generate an out of memory error: 599 // - if there is a preallocated error and stack traces are available 600 // (j.l.Throwable is initialized), then return the preallocated 601 // error with a filled in stack trace, and with the message 602 // provided by the default error. 603 // - otherwise, return the default error, without a stack trace. 604 int next; 605 if ((_preallocated_out_of_memory_error_avail_count > 0) && 606 SystemDictionary::Throwable_klass()->is_initialized()) { 607 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 608 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 609 } else { 610 next = -1; 611 } 612 if (next < 0) { 613 // all preallocated errors have been used. 614 // return default 615 return default_err; 616 } else { 617 // get the error object at the slot and set set it to NULL so that the 618 // array isn't keeping it alive anymore. 619 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 620 assert(exc != NULL, "slot has been used already"); 621 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 622 623 // use the message from the default error 624 oop msg = java_lang_Throwable::message(default_err); 625 assert(msg != NULL, "no message"); 626 java_lang_Throwable::set_message(exc, msg); 627 628 // populate the stack trace and return it. 629 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 630 return exc; 631 } 632 } 633 634 intptr_t Universe::_non_oop_bits = 0; 635 636 void* Universe::non_oop_word() { 637 // Neither the high bits nor the low bits of this value is allowed 638 // to look like (respectively) the high or low bits of a real oop. 639 // 640 // High and low are CPU-specific notions, but low always includes 641 // the low-order bit. Since oops are always aligned at least mod 4, 642 // setting the low-order bit will ensure that the low half of the 643 // word will never look like that of a real oop. 644 // 645 // Using the OS-supplied non-memory-address word (usually 0 or -1) 646 // will take care of the high bits, however many there are. 647 648 if (_non_oop_bits == 0) { 649 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 650 } 651 652 return (void*)_non_oop_bits; 653 } 654 655 jint universe_init() { 656 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 657 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 658 "LogHeapWordSize is incorrect."); 659 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 660 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 661 "oop size is not not a multiple of HeapWord size"); 662 663 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 664 665 JavaClasses::compute_hard_coded_offsets(); 666 667 jint status = Universe::initialize_heap(); 668 if (status != JNI_OK) { 669 return status; 670 } 671 672 Metaspace::global_initialize(); 673 674 // Checks 'AfterMemoryInit' constraints. 675 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) { 676 return JNI_EINVAL; 677 } 678 679 // Create memory for metadata. Must be after initializing heap for 680 // DumpSharedSpaces. 681 ClassLoaderData::init_null_class_loader_data(); 682 683 // We have a heap so create the Method* caches before 684 // Metaspace::initialize_shared_spaces() tries to populate them. 685 Universe::_finalizer_register_cache = new LatestMethodCache(); 686 Universe::_loader_addClass_cache = new LatestMethodCache(); 687 Universe::_pd_implies_cache = new LatestMethodCache(); 688 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 689 Universe::_do_stack_walk_cache = new LatestMethodCache(); 690 691 if (UseSharedSpaces) { 692 // Read the data structures supporting the shared spaces (shared 693 // system dictionary, symbol table, etc.). After that, access to 694 // the file (other than the mapped regions) is no longer needed, and 695 // the file is closed. Closing the file does not affect the 696 // currently mapped regions. 697 MetaspaceShared::initialize_shared_spaces(); 698 StringTable::create_table(); 699 } else { 700 SymbolTable::create_table(); 701 StringTable::create_table(); 702 703 if (DumpSharedSpaces) { 704 MetaspaceShared::prepare_for_dumping(); 705 } 706 } 707 if (strlen(VerifySubSet) > 0) { 708 Universe::initialize_verify_flags(); 709 } 710 711 return JNI_OK; 712 } 713 714 CollectedHeap* Universe::create_heap() { 715 assert(_collectedHeap == NULL, "Heap already created"); 716 #if !INCLUDE_ALL_GCS 717 if (UseParallelGC) { 718 fatal("UseParallelGC not supported in this VM."); 719 } else if (UseG1GC) { 720 fatal("UseG1GC not supported in this VM."); 721 } else if (UseConcMarkSweepGC) { 722 fatal("UseConcMarkSweepGC not supported in this VM."); 723 #else 724 if (UseParallelGC) { 725 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>(); 726 } else if (UseG1GC) { 727 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>(); 728 } else if (UseConcMarkSweepGC) { 729 return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>(); 730 #endif 731 } else if (UseSerialGC) { 732 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>(); 733 } 734 735 ShouldNotReachHere(); 736 return NULL; 737 } 738 739 // Choose the heap base address and oop encoding mode 740 // when compressed oops are used: 741 // Unscaled - Use 32-bits oops without encoding when 742 // NarrowOopHeapBaseMin + heap_size < 4Gb 743 // ZeroBased - Use zero based compressed oops with encoding when 744 // NarrowOopHeapBaseMin + heap_size < 32Gb 745 // HeapBased - Use compressed oops with heap base + encoding. 746 747 jint Universe::initialize_heap() { 748 jint status = JNI_ERR; 749 750 _collectedHeap = create_heap_ext(); 751 if (_collectedHeap == NULL) { 752 _collectedHeap = create_heap(); 753 } 754 755 status = _collectedHeap->initialize(); 756 if (status != JNI_OK) { 757 return status; 758 } 759 log_info(gc)("Using %s", _collectedHeap->name()); 760 761 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 762 763 #ifdef _LP64 764 if (UseCompressedOops) { 765 // Subtract a page because something can get allocated at heap base. 766 // This also makes implicit null checking work, because the 767 // memory+1 page below heap_base needs to cause a signal. 768 // See needs_explicit_null_check. 769 // Only set the heap base for compressed oops because it indicates 770 // compressed oops for pstack code. 771 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 772 // Didn't reserve heap below 4Gb. Must shift. 773 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 774 } 775 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 776 // Did reserve heap below 32Gb. Can use base == 0; 777 Universe::set_narrow_oop_base(0); 778 } 779 780 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 781 782 if (log_is_enabled(Info, gc, heap, coops)) { 783 ResourceMark rm; 784 outputStream* logst = Log(gc, heap, coops)::info_stream(); 785 Universe::print_compressed_oops_mode(logst); 786 } 787 788 // Tell tests in which mode we run. 789 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 790 narrow_oop_mode_to_string(narrow_oop_mode()), 791 false)); 792 } 793 // Universe::narrow_oop_base() is one page below the heap. 794 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 795 os::vm_page_size()) || 796 Universe::narrow_oop_base() == NULL, "invalid value"); 797 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 798 Universe::narrow_oop_shift() == 0, "invalid value"); 799 #endif 800 801 // We will never reach the CATCH below since Exceptions::_throw will cause 802 // the VM to exit if an exception is thrown during initialization 803 804 if (UseTLAB) { 805 assert(Universe::heap()->supports_tlab_allocation(), 806 "Should support thread-local allocation buffers"); 807 ThreadLocalAllocBuffer::startup_initialization(); 808 } 809 return JNI_OK; 810 } 811 812 void Universe::print_compressed_oops_mode(outputStream* st) { 813 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 814 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 815 816 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 817 818 if (Universe::narrow_oop_base() != 0) { 819 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 820 } 821 822 if (Universe::narrow_oop_shift() != 0) { 823 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 824 } 825 826 if (!Universe::narrow_oop_use_implicit_null_checks()) { 827 st->print(", no protected page in front of the heap"); 828 } 829 st->cr(); 830 } 831 832 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 833 834 assert(alignment <= Arguments::conservative_max_heap_alignment(), 835 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 836 alignment, Arguments::conservative_max_heap_alignment()); 837 838 size_t total_reserved = align_size_up(heap_size, alignment); 839 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 840 "heap size is too big for compressed oops"); 841 842 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size()); 843 assert(!UseLargePages 844 || UseParallelGC 845 || use_large_pages, "Wrong alignment to use large pages"); 846 847 // Now create the space. 848 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages); 849 850 if (total_rs.is_reserved()) { 851 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 852 "must be exactly of required size and alignment"); 853 // We are good. 854 855 if (UseCompressedOops) { 856 // Universe::initialize_heap() will reset this to NULL if unscaled 857 // or zero-based narrow oops are actually used. 858 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 859 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 860 } 861 862 return total_rs; 863 } 864 865 vm_exit_during_initialization( 866 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 867 total_reserved/K)); 868 869 // satisfy compiler 870 ShouldNotReachHere(); 871 return ReservedHeapSpace(0, 0, false); 872 } 873 874 875 // It's the caller's responsibility to ensure glitch-freedom 876 // (if required). 877 void Universe::update_heap_info_at_gc() { 878 _heap_capacity_at_last_gc = heap()->capacity(); 879 _heap_used_at_last_gc = heap()->used(); 880 } 881 882 883 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 884 switch (mode) { 885 case UnscaledNarrowOop: 886 return "32-bit"; 887 case ZeroBasedNarrowOop: 888 return "Zero based"; 889 case DisjointBaseNarrowOop: 890 return "Non-zero disjoint base"; 891 case HeapBasedNarrowOop: 892 return "Non-zero based"; 893 } 894 895 ShouldNotReachHere(); 896 return ""; 897 } 898 899 900 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 901 if (narrow_oop_base_disjoint()) { 902 return DisjointBaseNarrowOop; 903 } 904 905 if (narrow_oop_base() != 0) { 906 return HeapBasedNarrowOop; 907 } 908 909 if (narrow_oop_shift() != 0) { 910 return ZeroBasedNarrowOop; 911 } 912 913 return UnscaledNarrowOop; 914 } 915 916 void initialize_known_method(LatestMethodCache* method_cache, 917 InstanceKlass* ik, 918 const char* method, 919 Symbol* signature, 920 bool is_static, TRAPS) 921 { 922 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK); 923 Method* m = NULL; 924 // The klass must be linked before looking up the method. 925 if (!ik->link_class_or_fail(THREAD) || 926 ((m = ik->find_method(name, signature)) == NULL) || 927 is_static != m->is_static()) { 928 ResourceMark rm(THREAD); 929 // NoSuchMethodException doesn't actually work because it tries to run the 930 // <init> function before java_lang_Class is linked. Print error and exit. 931 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 932 ik->name()->as_C_string(), method)); 933 } 934 method_cache->init(ik, m); 935 } 936 937 void Universe::initialize_known_methods(TRAPS) { 938 // Set up static method for registering finalizers 939 initialize_known_method(_finalizer_register_cache, 940 SystemDictionary::Finalizer_klass(), 941 "register", 942 vmSymbols::object_void_signature(), true, CHECK); 943 944 initialize_known_method(_throw_illegal_access_error_cache, 945 SystemDictionary::internal_Unsafe_klass(), 946 "throwIllegalAccessError", 947 vmSymbols::void_method_signature(), true, CHECK); 948 949 // Set up method for registering loaded classes in class loader vector 950 initialize_known_method(_loader_addClass_cache, 951 SystemDictionary::ClassLoader_klass(), 952 "addClass", 953 vmSymbols::class_void_signature(), false, CHECK); 954 955 // Set up method for checking protection domain 956 initialize_known_method(_pd_implies_cache, 957 SystemDictionary::ProtectionDomain_klass(), 958 "impliesCreateAccessControlContext", 959 vmSymbols::void_boolean_signature(), false, CHECK); 960 961 // Set up method for stack walking 962 initialize_known_method(_do_stack_walk_cache, 963 SystemDictionary::AbstractStackWalker_klass(), 964 "doStackWalk", 965 vmSymbols::doStackWalk_signature(), false, CHECK); 966 } 967 968 void universe2_init() { 969 EXCEPTION_MARK; 970 Universe::genesis(CATCH); 971 } 972 973 // Set after initialization of the module runtime, call_initModuleRuntime 974 void universe_post_module_init() { 975 Universe::_module_initialized = true; 976 } 977 978 bool universe_post_init() { 979 assert(!is_init_completed(), "Error: initialization not yet completed!"); 980 Universe::_fully_initialized = true; 981 EXCEPTION_MARK; 982 { ResourceMark rm; 983 Interpreter::initialize(); // needed for interpreter entry points 984 if (!UseSharedSpaces) { 985 HandleMark hm(THREAD); 986 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 987 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 988 Universe::reinitialize_itables(CHECK_false); 989 } 990 } 991 992 HandleMark hm(THREAD); 993 Klass* k; 994 instanceKlassHandle k_h; 995 // Setup preallocated empty java.lang.Class array 996 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 997 998 // Setup preallocated OutOfMemoryError errors 999 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 1000 k_h = instanceKlassHandle(THREAD, k); 1001 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 1002 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); 1003 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); 1004 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 1005 Universe::_out_of_memory_error_gc_overhead_limit = 1006 k_h->allocate_instance(CHECK_false); 1007 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false); 1008 1009 // Setup preallocated cause message for delayed StackOverflowError 1010 if (StackReservedPages > 0) { 1011 Universe::_delayed_stack_overflow_error_message = 1012 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1013 } 1014 1015 // Setup preallocated NullPointerException 1016 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1017 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1018 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1019 // Setup preallocated ArithmeticException 1020 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1021 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1022 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1023 // Virtual Machine Error for when we get into a situation we can't resolve 1024 k = SystemDictionary::resolve_or_fail( 1025 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1026 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1027 if (!linked) { 1028 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1029 return false; // initialization failed 1030 } 1031 Universe::_virtual_machine_error_instance = 1032 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1033 1034 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1035 1036 if (!DumpSharedSpaces) { 1037 // These are the only Java fields that are currently set during shared space dumping. 1038 // We prefer to not handle this generally, so we always reinitialize these detail messages. 1039 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1040 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1041 1042 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 1043 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1044 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 1045 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1046 1047 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1048 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1049 1050 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1051 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1052 1053 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 1054 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 1055 1056 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1057 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1058 1059 // Setup the array of errors that have preallocated backtrace 1060 k = Universe::_out_of_memory_error_java_heap->klass(); 1061 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1062 k_h = instanceKlassHandle(THREAD, k); 1063 1064 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1065 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 1066 for (int i=0; i<len; i++) { 1067 oop err = k_h->allocate_instance(CHECK_false); 1068 Handle err_h = Handle(THREAD, err); 1069 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1070 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1071 } 1072 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1073 } 1074 1075 Universe::initialize_known_methods(CHECK_false); 1076 1077 // This needs to be done before the first scavenge/gc, since 1078 // it's an input to soft ref clearing policy. 1079 { 1080 MutexLocker x(Heap_lock); 1081 Universe::update_heap_info_at_gc(); 1082 } 1083 1084 // ("weak") refs processing infrastructure initialization 1085 Universe::heap()->post_initialize(); 1086 1087 // Initialize performance counters for metaspaces 1088 MetaspaceCounters::initialize_performance_counters(); 1089 CompressedClassSpaceCounters::initialize_performance_counters(); 1090 1091 MemoryService::add_metaspace_memory_pools(); 1092 1093 MemoryService::set_universe_heap(Universe::heap()); 1094 #if INCLUDE_CDS 1095 SharedClassUtil::initialize(CHECK_false); 1096 #endif 1097 return true; 1098 } 1099 1100 1101 void Universe::compute_base_vtable_size() { 1102 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1103 } 1104 1105 void Universe::print_on(outputStream* st) { 1106 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1107 st->print_cr("Heap"); 1108 heap()->print_on(st); 1109 } 1110 1111 void Universe::print_heap_at_SIGBREAK() { 1112 if (PrintHeapAtSIGBREAK) { 1113 print_on(tty); 1114 tty->cr(); 1115 tty->flush(); 1116 } 1117 } 1118 1119 void Universe::print_heap_before_gc() { 1120 Log(gc, heap) log; 1121 if (log.is_debug()) { 1122 log.debug("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1123 ResourceMark rm; 1124 heap()->print_on(log.debug_stream()); 1125 } 1126 } 1127 1128 void Universe::print_heap_after_gc() { 1129 Log(gc, heap) log; 1130 if (log.is_debug()) { 1131 log.debug("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1132 ResourceMark rm; 1133 heap()->print_on(log.debug_stream()); 1134 } 1135 } 1136 1137 void Universe::initialize_verify_flags() { 1138 verify_flags = 0; 1139 const char delimiter[] = " ,"; 1140 1141 size_t length = strlen(VerifySubSet); 1142 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1143 strncpy(subset_list, VerifySubSet, length + 1); 1144 1145 char* token = strtok(subset_list, delimiter); 1146 while (token != NULL) { 1147 if (strcmp(token, "threads") == 0) { 1148 verify_flags |= Verify_Threads; 1149 } else if (strcmp(token, "heap") == 0) { 1150 verify_flags |= Verify_Heap; 1151 } else if (strcmp(token, "symbol_table") == 0) { 1152 verify_flags |= Verify_SymbolTable; 1153 } else if (strcmp(token, "string_table") == 0) { 1154 verify_flags |= Verify_StringTable; 1155 } else if (strcmp(token, "codecache") == 0) { 1156 verify_flags |= Verify_CodeCache; 1157 } else if (strcmp(token, "dictionary") == 0) { 1158 verify_flags |= Verify_SystemDictionary; 1159 } else if (strcmp(token, "classloader_data_graph") == 0) { 1160 verify_flags |= Verify_ClassLoaderDataGraph; 1161 } else if (strcmp(token, "metaspace") == 0) { 1162 verify_flags |= Verify_MetaspaceAux; 1163 } else if (strcmp(token, "jni_handles") == 0) { 1164 verify_flags |= Verify_JNIHandles; 1165 } else if (strcmp(token, "codecache_oops") == 0) { 1166 verify_flags |= Verify_CodeCacheOops; 1167 } else { 1168 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1169 } 1170 token = strtok(NULL, delimiter); 1171 } 1172 FREE_C_HEAP_ARRAY(char, subset_list); 1173 } 1174 1175 bool Universe::should_verify_subset(uint subset) { 1176 if (verify_flags & subset) { 1177 return true; 1178 } 1179 return false; 1180 } 1181 1182 void Universe::verify(VerifyOption option, const char* prefix) { 1183 // The use of _verify_in_progress is a temporary work around for 1184 // 6320749. Don't bother with a creating a class to set and clear 1185 // it since it is only used in this method and the control flow is 1186 // straight forward. 1187 _verify_in_progress = true; 1188 1189 COMPILER2_PRESENT( 1190 assert(!DerivedPointerTable::is_active(), 1191 "DPT should not be active during verification " 1192 "(of thread stacks below)"); 1193 ) 1194 1195 ResourceMark rm; 1196 HandleMark hm; // Handles created during verification can be zapped 1197 _verify_count++; 1198 1199 FormatBuffer<> title("Verifying %s", prefix); 1200 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1201 if (should_verify_subset(Verify_Threads)) { 1202 log_debug(gc, verify)("Threads"); 1203 Threads::verify(); 1204 } 1205 if (should_verify_subset(Verify_Heap)) { 1206 log_debug(gc, verify)("Heap"); 1207 heap()->verify(option); 1208 } 1209 if (should_verify_subset(Verify_SymbolTable)) { 1210 log_debug(gc, verify)("SymbolTable"); 1211 SymbolTable::verify(); 1212 } 1213 if (should_verify_subset(Verify_StringTable)) { 1214 log_debug(gc, verify)("StringTable"); 1215 StringTable::verify(); 1216 } 1217 if (should_verify_subset(Verify_CodeCache)) { 1218 { 1219 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1220 log_debug(gc, verify)("CodeCache"); 1221 CodeCache::verify(); 1222 } 1223 } 1224 if (should_verify_subset(Verify_SystemDictionary)) { 1225 log_debug(gc, verify)("SystemDictionary"); 1226 SystemDictionary::verify(); 1227 } 1228 #ifndef PRODUCT 1229 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1230 log_debug(gc, verify)("ClassLoaderDataGraph"); 1231 ClassLoaderDataGraph::verify(); 1232 } 1233 #endif 1234 if (should_verify_subset(Verify_MetaspaceAux)) { 1235 log_debug(gc, verify)("MetaspaceAux"); 1236 MetaspaceAux::verify_free_chunks(); 1237 } 1238 if (should_verify_subset(Verify_JNIHandles)) { 1239 log_debug(gc, verify)("JNIHandles"); 1240 JNIHandles::verify(); 1241 } 1242 if (should_verify_subset(Verify_CodeCacheOops)) { 1243 log_debug(gc, verify)("CodeCache Oops"); 1244 CodeCache::verify_oops(); 1245 } 1246 1247 _verify_in_progress = false; 1248 } 1249 1250 1251 #ifndef PRODUCT 1252 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1253 assert(low_boundary < high_boundary, "bad interval"); 1254 1255 // decide which low-order bits we require to be clear: 1256 size_t alignSize = MinObjAlignmentInBytes; 1257 size_t min_object_size = CollectedHeap::min_fill_size(); 1258 1259 // make an inclusive limit: 1260 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1261 uintptr_t min = (uintptr_t)low_boundary; 1262 assert(min < max, "bad interval"); 1263 uintptr_t diff = max ^ min; 1264 1265 // throw away enough low-order bits to make the diff vanish 1266 uintptr_t mask = (uintptr_t)(-1); 1267 while ((mask & diff) != 0) 1268 mask <<= 1; 1269 uintptr_t bits = (min & mask); 1270 assert(bits == (max & mask), "correct mask"); 1271 // check an intermediate value between min and max, just to make sure: 1272 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1273 1274 // require address alignment, too: 1275 mask |= (alignSize - 1); 1276 1277 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1278 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1279 } 1280 _verify_oop_mask = mask; 1281 _verify_oop_bits = bits; 1282 } 1283 1284 // Oop verification (see MacroAssembler::verify_oop) 1285 1286 uintptr_t Universe::verify_oop_mask() { 1287 MemRegion m = heap()->reserved_region(); 1288 calculate_verify_data(m.start(), m.end()); 1289 return _verify_oop_mask; 1290 } 1291 1292 uintptr_t Universe::verify_oop_bits() { 1293 MemRegion m = heap()->reserved_region(); 1294 calculate_verify_data(m.start(), m.end()); 1295 return _verify_oop_bits; 1296 } 1297 1298 uintptr_t Universe::verify_mark_mask() { 1299 return markOopDesc::lock_mask_in_place; 1300 } 1301 1302 uintptr_t Universe::verify_mark_bits() { 1303 intptr_t mask = verify_mark_mask(); 1304 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1305 assert((bits & ~mask) == 0, "no stray header bits"); 1306 return bits; 1307 } 1308 #endif // PRODUCT 1309 1310 1311 void Universe::compute_verify_oop_data() { 1312 verify_oop_mask(); 1313 verify_oop_bits(); 1314 verify_mark_mask(); 1315 verify_mark_bits(); 1316 } 1317 1318 1319 void LatestMethodCache::init(Klass* k, Method* m) { 1320 if (!UseSharedSpaces) { 1321 _klass = k; 1322 } 1323 #ifndef PRODUCT 1324 else { 1325 // sharing initilization should have already set up _klass 1326 assert(_klass != NULL, "just checking"); 1327 } 1328 #endif 1329 1330 _method_idnum = m->method_idnum(); 1331 assert(_method_idnum >= 0, "sanity check"); 1332 } 1333 1334 1335 Method* LatestMethodCache::get_method() { 1336 if (klass() == NULL) return NULL; 1337 InstanceKlass* ik = InstanceKlass::cast(klass()); 1338 Method* m = ik->method_with_idnum(method_idnum()); 1339 assert(m != NULL, "sanity check"); 1340 return m; 1341 } 1342 1343 1344 #ifdef ASSERT 1345 // Release dummy object(s) at bottom of heap 1346 bool Universe::release_fullgc_alot_dummy() { 1347 MutexLocker ml(FullGCALot_lock); 1348 if (_fullgc_alot_dummy_array != NULL) { 1349 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1350 // No more dummies to release, release entire array instead 1351 _fullgc_alot_dummy_array = NULL; 1352 return false; 1353 } 1354 if (!UseConcMarkSweepGC) { 1355 // Release dummy at bottom of old generation 1356 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1357 } 1358 // Release dummy at bottom of permanent generation 1359 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1360 } 1361 return true; 1362 } 1363 1364 #endif // ASSERT