1 /* 2 * Copyright (c) 1997, 2015, 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/space.hpp" 40 #include "interpreter/interpreter.hpp" 41 #include "memory/filemap.hpp" 42 #include "memory/metadataFactory.hpp" 43 #include "memory/metaspaceShared.hpp" 44 #include "memory/oopFactory.hpp" 45 #include "memory/universe.hpp" 46 #include "memory/universe.inline.hpp" 47 #include "oops/constantPool.hpp" 48 #include "oops/instanceClassLoaderKlass.hpp" 49 #include "oops/instanceKlass.hpp" 50 #include "oops/instanceMirrorKlass.hpp" 51 #include "oops/instanceRefKlass.hpp" 52 #include "oops/objArrayOop.inline.hpp" 53 #include "oops/oop.inline.hpp" 54 #include "oops/typeArrayKlass.hpp" 55 #include "prims/jvmtiRedefineClassesTrace.hpp" 56 #include "runtime/arguments.hpp" 57 #include "runtime/atomic.inline.hpp" 58 #include "runtime/commandLineFlagConstraintList.hpp" 59 #include "runtime/deoptimization.hpp" 60 #include "runtime/fprofiler.hpp" 61 #include "runtime/handles.inline.hpp" 62 #include "runtime/init.hpp" 63 #include "runtime/java.hpp" 64 #include "runtime/javaCalls.hpp" 65 #include "runtime/sharedRuntime.hpp" 66 #include "runtime/synchronizer.hpp" 67 #include "runtime/thread.inline.hpp" 68 #include "runtime/timer.hpp" 69 #include "runtime/vm_operations.hpp" 70 #include "services/memoryService.hpp" 71 #include "utilities/copy.hpp" 72 #include "utilities/events.hpp" 73 #include "utilities/hashtable.inline.hpp" 74 #include "utilities/macros.hpp" 75 #include "utilities/preserveException.hpp" 76 #if INCLUDE_ALL_GCS 77 #include "gc/cms/cmsCollectorPolicy.hpp" 78 #include "gc/g1/g1CollectedHeap.inline.hpp" 79 #include "gc/g1/g1CollectorPolicy.hpp" 80 #include "gc/parallel/parallelScavengeHeap.hpp" 81 #include "gc/shared/adaptiveSizePolicy.hpp" 82 #endif // INCLUDE_ALL_GCS 83 #if INCLUDE_CDS 84 #include "classfile/sharedClassUtil.hpp" 85 #endif 86 87 // Known objects 88 Klass* Universe::_boolArrayKlassObj = NULL; 89 Klass* Universe::_byteArrayKlassObj = NULL; 90 Klass* Universe::_charArrayKlassObj = NULL; 91 Klass* Universe::_intArrayKlassObj = NULL; 92 Klass* Universe::_shortArrayKlassObj = NULL; 93 Klass* Universe::_longArrayKlassObj = NULL; 94 Klass* Universe::_singleArrayKlassObj = NULL; 95 Klass* Universe::_doubleArrayKlassObj = NULL; 96 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 97 Klass* Universe::_objectArrayKlassObj = NULL; 98 oop Universe::_int_mirror = NULL; 99 oop Universe::_float_mirror = NULL; 100 oop Universe::_double_mirror = NULL; 101 oop Universe::_byte_mirror = NULL; 102 oop Universe::_bool_mirror = NULL; 103 oop Universe::_char_mirror = NULL; 104 oop Universe::_long_mirror = NULL; 105 oop Universe::_short_mirror = NULL; 106 oop Universe::_void_mirror = NULL; 107 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 108 oop Universe::_main_thread_group = NULL; 109 oop Universe::_system_thread_group = NULL; 110 objArrayOop Universe::_the_empty_class_klass_array = NULL; 111 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 112 oop Universe::_the_null_string = NULL; 113 oop Universe::_the_min_jint_string = NULL; 114 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 115 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 116 LatestMethodCache* Universe::_pd_implies_cache = NULL; 117 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 118 oop Universe::_out_of_memory_error_java_heap = NULL; 119 oop Universe::_out_of_memory_error_metaspace = NULL; 120 oop Universe::_out_of_memory_error_class_metaspace = NULL; 121 oop Universe::_out_of_memory_error_array_size = NULL; 122 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 123 oop Universe::_out_of_memory_error_realloc_objects = NULL; 124 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 125 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 126 bool Universe::_verify_in_progress = false; 127 oop Universe::_null_ptr_exception_instance = NULL; 128 oop Universe::_arithmetic_exception_instance = NULL; 129 oop Universe::_virtual_machine_error_instance = NULL; 130 oop Universe::_vm_exception = NULL; 131 oop Universe::_allocation_context_notification_obj = NULL; 132 133 Array<int>* Universe::_the_empty_int_array = NULL; 134 Array<u2>* Universe::_the_empty_short_array = NULL; 135 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 136 Array<Method*>* Universe::_the_empty_method_array = NULL; 137 138 // These variables are guarded by FullGCALot_lock. 139 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 140 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 141 142 // Heap 143 int Universe::_verify_count = 0; 144 145 // Oop verification (see MacroAssembler::verify_oop) 146 uintptr_t Universe::_verify_oop_mask = 0; 147 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 148 149 int Universe::_base_vtable_size = 0; 150 bool Universe::_bootstrapping = false; 151 bool Universe::_fully_initialized = false; 152 153 size_t Universe::_heap_capacity_at_last_gc; 154 size_t Universe::_heap_used_at_last_gc = 0; 155 156 CollectedHeap* Universe::_collectedHeap = NULL; 157 158 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 159 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 160 address Universe::_narrow_ptrs_base; 161 162 void Universe::basic_type_classes_do(void f(Klass*)) { 163 f(boolArrayKlassObj()); 164 f(byteArrayKlassObj()); 165 f(charArrayKlassObj()); 166 f(intArrayKlassObj()); 167 f(shortArrayKlassObj()); 168 f(longArrayKlassObj()); 169 f(singleArrayKlassObj()); 170 f(doubleArrayKlassObj()); 171 } 172 173 void Universe::oops_do(OopClosure* f, bool do_all) { 174 175 f->do_oop((oop*) &_int_mirror); 176 f->do_oop((oop*) &_float_mirror); 177 f->do_oop((oop*) &_double_mirror); 178 f->do_oop((oop*) &_byte_mirror); 179 f->do_oop((oop*) &_bool_mirror); 180 f->do_oop((oop*) &_char_mirror); 181 f->do_oop((oop*) &_long_mirror); 182 f->do_oop((oop*) &_short_mirror); 183 f->do_oop((oop*) &_void_mirror); 184 185 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 186 f->do_oop((oop*) &_mirrors[i]); 187 } 188 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 189 190 f->do_oop((oop*)&_the_empty_class_klass_array); 191 f->do_oop((oop*)&_the_null_string); 192 f->do_oop((oop*)&_the_min_jint_string); 193 f->do_oop((oop*)&_out_of_memory_error_java_heap); 194 f->do_oop((oop*)&_out_of_memory_error_metaspace); 195 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 196 f->do_oop((oop*)&_out_of_memory_error_array_size); 197 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 198 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 199 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 200 f->do_oop((oop*)&_null_ptr_exception_instance); 201 f->do_oop((oop*)&_arithmetic_exception_instance); 202 f->do_oop((oop*)&_virtual_machine_error_instance); 203 f->do_oop((oop*)&_main_thread_group); 204 f->do_oop((oop*)&_system_thread_group); 205 f->do_oop((oop*)&_vm_exception); 206 f->do_oop((oop*)&_allocation_context_notification_obj); 207 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 208 } 209 210 // Serialize metadata in and out of CDS archive, not oops. 211 void Universe::serialize(SerializeClosure* f, bool do_all) { 212 213 f->do_ptr((void**)&_boolArrayKlassObj); 214 f->do_ptr((void**)&_byteArrayKlassObj); 215 f->do_ptr((void**)&_charArrayKlassObj); 216 f->do_ptr((void**)&_intArrayKlassObj); 217 f->do_ptr((void**)&_shortArrayKlassObj); 218 f->do_ptr((void**)&_longArrayKlassObj); 219 f->do_ptr((void**)&_singleArrayKlassObj); 220 f->do_ptr((void**)&_doubleArrayKlassObj); 221 f->do_ptr((void**)&_objectArrayKlassObj); 222 223 { 224 for (int i = 0; i < T_VOID+1; i++) { 225 if (_typeArrayKlassObjs[i] != NULL) { 226 assert(i >= T_BOOLEAN, "checking"); 227 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 228 } else if (do_all) { 229 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 230 } 231 } 232 } 233 234 f->do_ptr((void**)&_the_array_interfaces_array); 235 f->do_ptr((void**)&_the_empty_int_array); 236 f->do_ptr((void**)&_the_empty_short_array); 237 f->do_ptr((void**)&_the_empty_method_array); 238 f->do_ptr((void**)&_the_empty_klass_array); 239 _finalizer_register_cache->serialize(f); 240 _loader_addClass_cache->serialize(f); 241 _pd_implies_cache->serialize(f); 242 _throw_illegal_access_error_cache->serialize(f); 243 } 244 245 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 246 if (size < alignment || size % alignment != 0) { 247 vm_exit_during_initialization( 248 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 249 } 250 } 251 252 void initialize_basic_type_klass(Klass* k, TRAPS) { 253 Klass* ok = SystemDictionary::Object_klass(); 254 if (UseSharedSpaces) { 255 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 256 assert(k->super() == ok, "u3"); 257 k->restore_unshareable_info(loader_data, Handle(), CHECK); 258 } else { 259 k->initialize_supers(ok, CHECK); 260 } 261 k->append_to_sibling_list(); 262 } 263 264 void Universe::genesis(TRAPS) { 265 ResourceMark rm; 266 267 { FlagSetting fs(_bootstrapping, true); 268 269 { MutexLocker mc(Compile_lock); 270 271 // determine base vtable size; without that we cannot create the array klasses 272 compute_base_vtable_size(); 273 274 if (!UseSharedSpaces) { 275 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 276 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 277 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 278 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 279 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 280 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 281 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 282 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 283 284 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 285 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 286 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 287 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 288 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 289 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 290 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 291 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 292 293 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 294 295 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 296 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 297 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 298 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 299 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 300 } 301 } 302 303 vmSymbols::initialize(CHECK); 304 305 SystemDictionary::initialize(CHECK); 306 307 Klass* ok = SystemDictionary::Object_klass(); 308 309 _the_null_string = StringTable::intern("null", CHECK); 310 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 311 312 if (UseSharedSpaces) { 313 // Verify shared interfaces array. 314 assert(_the_array_interfaces_array->at(0) == 315 SystemDictionary::Cloneable_klass(), "u3"); 316 assert(_the_array_interfaces_array->at(1) == 317 SystemDictionary::Serializable_klass(), "u3"); 318 MetaspaceShared::fixup_shared_string_regions(); 319 } else { 320 // Set up shared interfaces array. (Do this before supers are set up.) 321 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 322 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 323 } 324 325 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 326 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 327 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 328 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 329 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 330 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 331 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 332 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 333 } // end of core bootstrapping 334 335 // Maybe this could be lifted up now that object array can be initialized 336 // during the bootstrapping. 337 338 // OLD 339 // Initialize _objectArrayKlass after core bootstraping to make 340 // sure the super class is set up properly for _objectArrayKlass. 341 // --- 342 // NEW 343 // Since some of the old system object arrays have been converted to 344 // ordinary object arrays, _objectArrayKlass will be loaded when 345 // SystemDictionary::initialize(CHECK); is run. See the extra check 346 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 347 _objectArrayKlassObj = InstanceKlass:: 348 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 349 // OLD 350 // Add the class to the class hierarchy manually to make sure that 351 // its vtable is initialized after core bootstrapping is completed. 352 // --- 353 // New 354 // Have already been initialized. 355 _objectArrayKlassObj->append_to_sibling_list(); 356 357 // Compute is_jdk version flags. 358 // Only 1.3 or later has the java.lang.Shutdown class. 359 // Only 1.4 or later has the java.lang.CharSequence interface. 360 // Only 1.5 or later has the java.lang.management.MemoryUsage class. 361 if (JDK_Version::is_partially_initialized()) { 362 uint8_t jdk_version; 363 Klass* k = SystemDictionary::resolve_or_null( 364 vmSymbols::java_lang_management_MemoryUsage(), THREAD); 365 CLEAR_PENDING_EXCEPTION; // ignore exceptions 366 if (k == NULL) { 367 k = SystemDictionary::resolve_or_null( 368 vmSymbols::java_lang_CharSequence(), THREAD); 369 CLEAR_PENDING_EXCEPTION; // ignore exceptions 370 if (k == NULL) { 371 k = SystemDictionary::resolve_or_null( 372 vmSymbols::java_lang_Shutdown(), THREAD); 373 CLEAR_PENDING_EXCEPTION; // ignore exceptions 374 if (k == NULL) { 375 jdk_version = 2; 376 } else { 377 jdk_version = 3; 378 } 379 } else { 380 jdk_version = 4; 381 } 382 } else { 383 jdk_version = 5; 384 } 385 JDK_Version::fully_initialize(jdk_version); 386 } 387 388 #ifdef ASSERT 389 if (FullGCALot) { 390 // Allocate an array of dummy objects. 391 // We'd like these to be at the bottom of the old generation, 392 // so that when we free one and then collect, 393 // (almost) the whole heap moves 394 // and we find out if we actually update all the oops correctly. 395 // But we can't allocate directly in the old generation, 396 // so we allocate wherever, and hope that the first collection 397 // moves these objects to the bottom of the old generation. 398 // We can allocate directly in the permanent generation, so we do. 399 int size; 400 if (UseConcMarkSweepGC) { 401 warning("Using +FullGCALot with concurrent mark sweep gc " 402 "will not force all objects to relocate"); 403 size = FullGCALotDummies; 404 } else { 405 size = FullGCALotDummies * 2; 406 } 407 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 408 objArrayHandle dummy_array(THREAD, naked_array); 409 int i = 0; 410 while (i < size) { 411 // Allocate dummy in old generation 412 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 413 dummy_array->obj_at_put(i++, dummy); 414 } 415 { 416 // Only modify the global variable inside the mutex. 417 // If we had a race to here, the other dummy_array instances 418 // and their elements just get dropped on the floor, which is fine. 419 MutexLocker ml(FullGCALot_lock); 420 if (_fullgc_alot_dummy_array == NULL) { 421 _fullgc_alot_dummy_array = dummy_array(); 422 } 423 } 424 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 425 } 426 #endif 427 428 // Initialize dependency array for null class loader 429 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 430 431 } 432 433 // CDS support for patching vtables in metadata in the shared archive. 434 // All types inherited from Metadata have vtables, but not types inherited 435 // from MetaspaceObj, because the latter does not have virtual functions. 436 // If the metadata type has a vtable, it cannot be shared in the read-only 437 // section of the CDS archive, because the vtable pointer is patched. 438 static inline void add_vtable(void** list, int* n, void* o, int count) { 439 guarantee((*n) < count, "vtable list too small"); 440 void* vtable = dereference_vptr(o); 441 assert(*(void**)(vtable) != NULL, "invalid vtable"); 442 list[(*n)++] = vtable; 443 } 444 445 void Universe::init_self_patching_vtbl_list(void** list, int count) { 446 int n = 0; 447 { InstanceKlass o; add_vtable(list, &n, &o, count); } 448 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 449 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 450 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 451 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 452 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 453 { Method o; add_vtable(list, &n, &o, count); } 454 { ConstantPool o; add_vtable(list, &n, &o, count); } 455 } 456 457 void Universe::initialize_basic_type_mirrors(TRAPS) { 458 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 459 _int_mirror = 460 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 461 _float_mirror = 462 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 463 _double_mirror = 464 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 465 _byte_mirror = 466 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 467 _bool_mirror = 468 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 469 _char_mirror = 470 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 471 _long_mirror = 472 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 473 _short_mirror = 474 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 475 _void_mirror = 476 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 477 478 _mirrors[T_INT] = _int_mirror; 479 _mirrors[T_FLOAT] = _float_mirror; 480 _mirrors[T_DOUBLE] = _double_mirror; 481 _mirrors[T_BYTE] = _byte_mirror; 482 _mirrors[T_BOOLEAN] = _bool_mirror; 483 _mirrors[T_CHAR] = _char_mirror; 484 _mirrors[T_LONG] = _long_mirror; 485 _mirrors[T_SHORT] = _short_mirror; 486 _mirrors[T_VOID] = _void_mirror; 487 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 488 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 489 } 490 491 void Universe::fixup_mirrors(TRAPS) { 492 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 493 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 494 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 495 // that the number of objects allocated at this point is very small. 496 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 497 HandleMark hm(THREAD); 498 // Cache the start of the static fields 499 InstanceMirrorKlass::init_offset_of_static_fields(); 500 501 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 502 int list_length = list->length(); 503 for (int i = 0; i < list_length; i++) { 504 Klass* k = list->at(i); 505 assert(k->is_klass(), "List should only hold classes"); 506 EXCEPTION_MARK; 507 KlassHandle kh(THREAD, k); 508 java_lang_Class::fixup_mirror(kh, CATCH); 509 } 510 delete java_lang_Class::fixup_mirror_list(); 511 java_lang_Class::set_fixup_mirror_list(NULL); 512 } 513 514 static bool has_run_finalizers_on_exit = false; 515 516 void Universe::run_finalizers_on_exit() { 517 if (has_run_finalizers_on_exit) return; 518 has_run_finalizers_on_exit = true; 519 520 // Called on VM exit. This ought to be run in a separate thread. 521 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 522 { 523 PRESERVE_EXCEPTION_MARK; 524 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 525 JavaValue result(T_VOID); 526 JavaCalls::call_static( 527 &result, 528 finalizer_klass, 529 vmSymbols::run_finalizers_on_exit_name(), 530 vmSymbols::void_method_signature(), 531 THREAD 532 ); 533 // Ignore any pending exceptions 534 CLEAR_PENDING_EXCEPTION; 535 } 536 } 537 538 539 // initialize_vtable could cause gc if 540 // 1) we specified true to initialize_vtable and 541 // 2) this ran after gc was enabled 542 // In case those ever change we use handles for oops 543 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 544 // init vtable of k and all subclasses 545 Klass* ko = k_h(); 546 klassVtable* vt = ko->vtable(); 547 if (vt) vt->initialize_vtable(false, CHECK); 548 if (ko->is_instance_klass()) { 549 for (KlassHandle s_h(THREAD, ko->subklass()); 550 s_h() != NULL; 551 s_h = KlassHandle(THREAD, s_h()->next_sibling())) { 552 reinitialize_vtable_of(s_h, CHECK); 553 } 554 } 555 } 556 557 558 void initialize_itable_for_klass(Klass* k, TRAPS) { 559 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 560 } 561 562 563 void Universe::reinitialize_itables(TRAPS) { 564 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 565 566 } 567 568 569 bool Universe::on_page_boundary(void* addr) { 570 return ((uintptr_t) addr) % os::vm_page_size() == 0; 571 } 572 573 574 bool Universe::should_fill_in_stack_trace(Handle throwable) { 575 // never attempt to fill in the stack trace of preallocated errors that do not have 576 // backtrace. These errors are kept alive forever and may be "re-used" when all 577 // preallocated errors with backtrace have been consumed. Also need to avoid 578 // a potential loop which could happen if an out of memory occurs when attempting 579 // to allocate the backtrace. 580 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 581 (throwable() != Universe::_out_of_memory_error_metaspace) && 582 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 583 (throwable() != Universe::_out_of_memory_error_array_size) && 584 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) && 585 (throwable() != Universe::_out_of_memory_error_realloc_objects)); 586 } 587 588 589 oop Universe::gen_out_of_memory_error(oop default_err) { 590 // generate an out of memory error: 591 // - if there is a preallocated error with backtrace available then return it wth 592 // a filled in stack trace. 593 // - if there are no preallocated errors with backtrace available then return 594 // an error without backtrace. 595 int next; 596 if (_preallocated_out_of_memory_error_avail_count > 0) { 597 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 598 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 599 } else { 600 next = -1; 601 } 602 if (next < 0) { 603 // all preallocated errors have been used. 604 // return default 605 return default_err; 606 } else { 607 // get the error object at the slot and set set it to NULL so that the 608 // array isn't keeping it alive anymore. 609 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 610 assert(exc != NULL, "slot has been used already"); 611 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 612 613 // use the message from the default error 614 oop msg = java_lang_Throwable::message(default_err); 615 assert(msg != NULL, "no message"); 616 java_lang_Throwable::set_message(exc, msg); 617 618 // populate the stack trace and return it. 619 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 620 return exc; 621 } 622 } 623 624 intptr_t Universe::_non_oop_bits = 0; 625 626 void* Universe::non_oop_word() { 627 // Neither the high bits nor the low bits of this value is allowed 628 // to look like (respectively) the high or low bits of a real oop. 629 // 630 // High and low are CPU-specific notions, but low always includes 631 // the low-order bit. Since oops are always aligned at least mod 4, 632 // setting the low-order bit will ensure that the low half of the 633 // word will never look like that of a real oop. 634 // 635 // Using the OS-supplied non-memory-address word (usually 0 or -1) 636 // will take care of the high bits, however many there are. 637 638 if (_non_oop_bits == 0) { 639 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 640 } 641 642 return (void*)_non_oop_bits; 643 } 644 645 jint universe_init() { 646 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 647 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 648 "LogHeapWordSize is incorrect."); 649 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 650 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 651 "oop size is not not a multiple of HeapWord size"); 652 TraceTime timer("Genesis", TraceStartupTime); 653 JavaClasses::compute_hard_coded_offsets(); 654 655 jint status = Universe::initialize_heap(); 656 if (status != JNI_OK) { 657 return status; 658 } 659 660 Metaspace::global_initialize(); 661 662 // Checks 'AfterMemoryInit' constraints. 663 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) { 664 return JNI_EINVAL; 665 } 666 667 // Create memory for metadata. Must be after initializing heap for 668 // DumpSharedSpaces. 669 ClassLoaderData::init_null_class_loader_data(); 670 671 // We have a heap so create the Method* caches before 672 // Metaspace::initialize_shared_spaces() tries to populate them. 673 Universe::_finalizer_register_cache = new LatestMethodCache(); 674 Universe::_loader_addClass_cache = new LatestMethodCache(); 675 Universe::_pd_implies_cache = new LatestMethodCache(); 676 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 677 678 if (UseSharedSpaces) { 679 // Read the data structures supporting the shared spaces (shared 680 // system dictionary, symbol table, etc.). After that, access to 681 // the file (other than the mapped regions) is no longer needed, and 682 // the file is closed. Closing the file does not affect the 683 // currently mapped regions. 684 MetaspaceShared::initialize_shared_spaces(); 685 StringTable::create_table(); 686 } else { 687 SymbolTable::create_table(); 688 StringTable::create_table(); 689 ClassLoader::create_package_info_table(); 690 691 if (DumpSharedSpaces) { 692 MetaspaceShared::prepare_for_dumping(); 693 } 694 } 695 696 return JNI_OK; 697 } 698 699 CollectedHeap* Universe::create_heap() { 700 assert(_collectedHeap == NULL, "Heap already created"); 701 #if !INCLUDE_ALL_GCS 702 if (UseParallelGC) { 703 fatal("UseParallelGC not supported in this VM."); 704 } else if (UseG1GC) { 705 fatal("UseG1GC not supported in this VM."); 706 } else if (UseConcMarkSweepGC) { 707 fatal("UseConcMarkSweepGC not supported in this VM."); 708 #else 709 if (UseParallelGC) { 710 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>(); 711 } else if (UseG1GC) { 712 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>(); 713 } else if (UseConcMarkSweepGC) { 714 return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>(); 715 #endif 716 } else if (UseSerialGC) { 717 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>(); 718 } 719 720 ShouldNotReachHere(); 721 return NULL; 722 } 723 724 // Choose the heap base address and oop encoding mode 725 // when compressed oops are used: 726 // Unscaled - Use 32-bits oops without encoding when 727 // NarrowOopHeapBaseMin + heap_size < 4Gb 728 // ZeroBased - Use zero based compressed oops with encoding when 729 // NarrowOopHeapBaseMin + heap_size < 32Gb 730 // HeapBased - Use compressed oops with heap base + encoding. 731 732 jint Universe::initialize_heap() { 733 jint status = JNI_ERR; 734 735 _collectedHeap = create_heap_ext(); 736 if (_collectedHeap == NULL) { 737 _collectedHeap = create_heap(); 738 } 739 740 status = _collectedHeap->initialize(); 741 if (status != JNI_OK) { 742 return status; 743 } 744 745 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 746 747 #ifdef _LP64 748 if (UseCompressedOops) { 749 // Subtract a page because something can get allocated at heap base. 750 // This also makes implicit null checking work, because the 751 // memory+1 page below heap_base needs to cause a signal. 752 // See needs_explicit_null_check. 753 // Only set the heap base for compressed oops because it indicates 754 // compressed oops for pstack code. 755 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 756 // Didn't reserve heap below 4Gb. Must shift. 757 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 758 } 759 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 760 // Did reserve heap below 32Gb. Can use base == 0; 761 Universe::set_narrow_oop_base(0); 762 } 763 764 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 765 766 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 767 Universe::print_compressed_oops_mode(tty); 768 } 769 770 // Tell tests in which mode we run. 771 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 772 narrow_oop_mode_to_string(narrow_oop_mode()), 773 false)); 774 } 775 // Universe::narrow_oop_base() is one page below the heap. 776 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 777 os::vm_page_size()) || 778 Universe::narrow_oop_base() == NULL, "invalid value"); 779 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 780 Universe::narrow_oop_shift() == 0, "invalid value"); 781 #endif 782 783 // We will never reach the CATCH below since Exceptions::_throw will cause 784 // the VM to exit if an exception is thrown during initialization 785 786 if (UseTLAB) { 787 assert(Universe::heap()->supports_tlab_allocation(), 788 "Should support thread-local allocation buffers"); 789 ThreadLocalAllocBuffer::startup_initialization(); 790 } 791 return JNI_OK; 792 } 793 794 void Universe::print_compressed_oops_mode(outputStream* st) { 795 st->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 796 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 797 798 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 799 800 if (Universe::narrow_oop_base() != 0) { 801 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 802 } 803 804 if (Universe::narrow_oop_shift() != 0) { 805 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 806 } 807 808 if (!Universe::narrow_oop_use_implicit_null_checks()) { 809 st->print(", no protected page in front of the heap"); 810 } 811 st->cr(); 812 } 813 814 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 815 816 assert(alignment <= Arguments::conservative_max_heap_alignment(), 817 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 818 alignment, Arguments::conservative_max_heap_alignment()); 819 820 size_t total_reserved = align_size_up(heap_size, alignment); 821 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 822 "heap size is too big for compressed oops"); 823 824 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size()); 825 assert(!UseLargePages 826 || UseParallelGC 827 || use_large_pages, "Wrong alignment to use large pages"); 828 829 // Now create the space. 830 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages); 831 832 if (total_rs.is_reserved()) { 833 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 834 "must be exactly of required size and alignment"); 835 // We are good. 836 837 if (UseCompressedOops) { 838 // Universe::initialize_heap() will reset this to NULL if unscaled 839 // or zero-based narrow oops are actually used. 840 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 841 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 842 } 843 844 return total_rs; 845 } 846 847 vm_exit_during_initialization( 848 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 849 total_reserved/K)); 850 851 // satisfy compiler 852 ShouldNotReachHere(); 853 return ReservedHeapSpace(0, 0, false); 854 } 855 856 857 // It's the caller's responsibility to ensure glitch-freedom 858 // (if required). 859 void Universe::update_heap_info_at_gc() { 860 _heap_capacity_at_last_gc = heap()->capacity(); 861 _heap_used_at_last_gc = heap()->used(); 862 } 863 864 865 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 866 switch (mode) { 867 case UnscaledNarrowOop: 868 return "32-bit"; 869 case ZeroBasedNarrowOop: 870 return "Zero based"; 871 case DisjointBaseNarrowOop: 872 return "Non-zero disjoint base"; 873 case HeapBasedNarrowOop: 874 return "Non-zero based"; 875 } 876 877 ShouldNotReachHere(); 878 return ""; 879 } 880 881 882 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 883 if (narrow_oop_base_disjoint()) { 884 return DisjointBaseNarrowOop; 885 } 886 887 if (narrow_oop_base() != 0) { 888 return HeapBasedNarrowOop; 889 } 890 891 if (narrow_oop_shift() != 0) { 892 return ZeroBasedNarrowOop; 893 } 894 895 return UnscaledNarrowOop; 896 } 897 898 899 void universe2_init() { 900 EXCEPTION_MARK; 901 Universe::genesis(CATCH); 902 } 903 904 905 bool universe_post_init() { 906 assert(!is_init_completed(), "Error: initialization not yet completed!"); 907 Universe::_fully_initialized = true; 908 EXCEPTION_MARK; 909 { ResourceMark rm; 910 Interpreter::initialize(); // needed for interpreter entry points 911 if (!UseSharedSpaces) { 912 HandleMark hm(THREAD); 913 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 914 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 915 Universe::reinitialize_itables(CHECK_false); 916 } 917 } 918 919 HandleMark hm(THREAD); 920 Klass* k; 921 instanceKlassHandle k_h; 922 // Setup preallocated empty java.lang.Class array 923 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 924 925 // Setup preallocated OutOfMemoryError errors 926 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 927 k_h = instanceKlassHandle(THREAD, k); 928 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 929 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); 930 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); 931 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 932 Universe::_out_of_memory_error_gc_overhead_limit = 933 k_h->allocate_instance(CHECK_false); 934 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false); 935 936 // Setup preallocated NullPointerException 937 // (this is currently used for a cheap & dirty solution in compiler exception handling) 938 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 939 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 940 // Setup preallocated ArithmeticException 941 // (this is currently used for a cheap & dirty solution in compiler exception handling) 942 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 943 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 944 // Virtual Machine Error for when we get into a situation we can't resolve 945 k = SystemDictionary::resolve_or_fail( 946 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 947 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 948 if (!linked) { 949 tty->print_cr("Unable to link/verify VirtualMachineError class"); 950 return false; // initialization failed 951 } 952 Universe::_virtual_machine_error_instance = 953 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 954 955 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 956 957 if (!DumpSharedSpaces) { 958 // These are the only Java fields that are currently set during shared space dumping. 959 // We prefer to not handle this generally, so we always reinitialize these detail messages. 960 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 961 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 962 963 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 964 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 965 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 966 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 967 968 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 969 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 970 971 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 972 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 973 974 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 975 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 976 977 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 978 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 979 980 // Setup the array of errors that have preallocated backtrace 981 k = Universe::_out_of_memory_error_java_heap->klass(); 982 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 983 k_h = instanceKlassHandle(THREAD, k); 984 985 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 986 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 987 for (int i=0; i<len; i++) { 988 oop err = k_h->allocate_instance(CHECK_false); 989 Handle err_h = Handle(THREAD, err); 990 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 991 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 992 } 993 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 994 } 995 996 997 // Setup static method for registering finalizers 998 // The finalizer klass must be linked before looking up the method, in 999 // case it needs to get rewritten. 1000 SystemDictionary::Finalizer_klass()->link_class(CHECK_false); 1001 Method* m = SystemDictionary::Finalizer_klass()->find_method( 1002 vmSymbols::register_method_name(), 1003 vmSymbols::register_method_signature()); 1004 if (m == NULL || !m->is_static()) { 1005 tty->print_cr("Unable to link/verify Finalizer.register method"); 1006 return false; // initialization failed (cannot throw exception yet) 1007 } 1008 Universe::_finalizer_register_cache->init( 1009 SystemDictionary::Finalizer_klass(), m); 1010 1011 SystemDictionary::internal_Unsafe_klass()->link_class(CHECK_false); 1012 m = SystemDictionary::internal_Unsafe_klass()->find_method( 1013 vmSymbols::throwIllegalAccessError_name(), 1014 vmSymbols::void_method_signature()); 1015 if (m != NULL && !m->is_static()) { 1016 // Note null is okay; this method is used in itables, and if it is null, 1017 // then AbstractMethodError is thrown instead. 1018 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method"); 1019 return false; // initialization failed (cannot throw exception yet) 1020 } 1021 Universe::_throw_illegal_access_error_cache->init( 1022 SystemDictionary::internal_Unsafe_klass(), m); 1023 1024 // Setup method for registering loaded classes in class loader vector 1025 SystemDictionary::ClassLoader_klass()->link_class(CHECK_false); 1026 m = SystemDictionary::ClassLoader_klass()->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1027 if (m == NULL || m->is_static()) { 1028 tty->print_cr("Unable to link/verify ClassLoader.addClass method"); 1029 return false; // initialization failed (cannot throw exception yet) 1030 } 1031 Universe::_loader_addClass_cache->init( 1032 SystemDictionary::ClassLoader_klass(), m); 1033 1034 // Setup method for checking protection domain 1035 SystemDictionary::ProtectionDomain_klass()->link_class(CHECK_false); 1036 m = SystemDictionary::ProtectionDomain_klass()-> 1037 find_method(vmSymbols::impliesCreateAccessControlContext_name(), 1038 vmSymbols::void_boolean_signature()); 1039 // Allow NULL which should only happen with bootstrapping. 1040 if (m != NULL) { 1041 if (m->is_static()) { 1042 // NoSuchMethodException doesn't actually work because it tries to run the 1043 // <init> function before java_lang_Class is linked. Print error and exit. 1044 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); 1045 return false; // initialization failed 1046 } 1047 Universe::_pd_implies_cache->init( 1048 SystemDictionary::ProtectionDomain_klass(), m); 1049 } 1050 1051 // This needs to be done before the first scavenge/gc, since 1052 // it's an input to soft ref clearing policy. 1053 { 1054 MutexLocker x(Heap_lock); 1055 Universe::update_heap_info_at_gc(); 1056 } 1057 1058 // ("weak") refs processing infrastructure initialization 1059 Universe::heap()->post_initialize(); 1060 1061 // Initialize performance counters for metaspaces 1062 MetaspaceCounters::initialize_performance_counters(); 1063 CompressedClassSpaceCounters::initialize_performance_counters(); 1064 1065 MemoryService::add_metaspace_memory_pools(); 1066 1067 MemoryService::set_universe_heap(Universe::heap()); 1068 #if INCLUDE_CDS 1069 SharedClassUtil::initialize(CHECK_false); 1070 #endif 1071 return true; 1072 } 1073 1074 1075 void Universe::compute_base_vtable_size() { 1076 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1077 } 1078 1079 1080 void Universe::print() { 1081 print_on(gclog_or_tty); 1082 } 1083 1084 void Universe::print_on(outputStream* st, bool extended) { 1085 st->print_cr("Heap"); 1086 if (!extended) { 1087 heap()->print_on(st); 1088 } else { 1089 heap()->print_extended_on(st); 1090 } 1091 } 1092 1093 void Universe::print_heap_at_SIGBREAK() { 1094 if (PrintHeapAtSIGBREAK) { 1095 MutexLocker hl(Heap_lock); 1096 print_on(tty); 1097 tty->cr(); 1098 tty->flush(); 1099 } 1100 } 1101 1102 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1103 st->print_cr("{Heap before GC invocations=%u (full %u):", 1104 heap()->total_collections(), 1105 heap()->total_full_collections()); 1106 if (!PrintHeapAtGCExtended || ignore_extended) { 1107 heap()->print_on(st); 1108 } else { 1109 heap()->print_extended_on(st); 1110 } 1111 } 1112 1113 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1114 st->print_cr("Heap after GC invocations=%u (full %u):", 1115 heap()->total_collections(), 1116 heap()->total_full_collections()); 1117 if (!PrintHeapAtGCExtended || ignore_extended) { 1118 heap()->print_on(st); 1119 } else { 1120 heap()->print_extended_on(st); 1121 } 1122 st->print_cr("}"); 1123 } 1124 1125 void Universe::verify(VerifyOption option, const char* prefix, bool silent) { 1126 // The use of _verify_in_progress is a temporary work around for 1127 // 6320749. Don't bother with a creating a class to set and clear 1128 // it since it is only used in this method and the control flow is 1129 // straight forward. 1130 _verify_in_progress = true; 1131 1132 COMPILER2_PRESENT( 1133 assert(!DerivedPointerTable::is_active(), 1134 "DPT should not be active during verification " 1135 "(of thread stacks below)"); 1136 ) 1137 1138 ResourceMark rm; 1139 HandleMark hm; // Handles created during verification can be zapped 1140 _verify_count++; 1141 1142 if (!silent) gclog_or_tty->print("%s", prefix); 1143 if (!silent) gclog_or_tty->print("[Verifying "); 1144 if (!silent) gclog_or_tty->print("threads "); 1145 Threads::verify(); 1146 if (!silent) gclog_or_tty->print("heap "); 1147 heap()->verify(silent, option); 1148 if (!silent) gclog_or_tty->print("syms "); 1149 SymbolTable::verify(); 1150 if (!silent) gclog_or_tty->print("strs "); 1151 StringTable::verify(); 1152 { 1153 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1154 if (!silent) gclog_or_tty->print("zone "); 1155 CodeCache::verify(); 1156 } 1157 if (!silent) gclog_or_tty->print("dict "); 1158 SystemDictionary::verify(); 1159 #ifndef PRODUCT 1160 if (!silent) gclog_or_tty->print("cldg "); 1161 ClassLoaderDataGraph::verify(); 1162 #endif 1163 if (!silent) gclog_or_tty->print("metaspace chunks "); 1164 MetaspaceAux::verify_free_chunks(); 1165 if (!silent) gclog_or_tty->print("hand "); 1166 JNIHandles::verify(); 1167 if (!silent) gclog_or_tty->print("C-heap "); 1168 os::check_heap(); 1169 if (!silent) gclog_or_tty->print("code cache "); 1170 CodeCache::verify_oops(); 1171 if (!silent) gclog_or_tty->print_cr("]"); 1172 1173 _verify_in_progress = false; 1174 } 1175 1176 1177 #ifndef PRODUCT 1178 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1179 assert(low_boundary < high_boundary, "bad interval"); 1180 1181 // decide which low-order bits we require to be clear: 1182 size_t alignSize = MinObjAlignmentInBytes; 1183 size_t min_object_size = CollectedHeap::min_fill_size(); 1184 1185 // make an inclusive limit: 1186 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1187 uintptr_t min = (uintptr_t)low_boundary; 1188 assert(min < max, "bad interval"); 1189 uintptr_t diff = max ^ min; 1190 1191 // throw away enough low-order bits to make the diff vanish 1192 uintptr_t mask = (uintptr_t)(-1); 1193 while ((mask & diff) != 0) 1194 mask <<= 1; 1195 uintptr_t bits = (min & mask); 1196 assert(bits == (max & mask), "correct mask"); 1197 // check an intermediate value between min and max, just to make sure: 1198 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1199 1200 // require address alignment, too: 1201 mask |= (alignSize - 1); 1202 1203 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1204 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1205 } 1206 _verify_oop_mask = mask; 1207 _verify_oop_bits = bits; 1208 } 1209 1210 // Oop verification (see MacroAssembler::verify_oop) 1211 1212 uintptr_t Universe::verify_oop_mask() { 1213 MemRegion m = heap()->reserved_region(); 1214 calculate_verify_data(m.start(), m.end()); 1215 return _verify_oop_mask; 1216 } 1217 1218 uintptr_t Universe::verify_oop_bits() { 1219 MemRegion m = heap()->reserved_region(); 1220 calculate_verify_data(m.start(), m.end()); 1221 return _verify_oop_bits; 1222 } 1223 1224 uintptr_t Universe::verify_mark_mask() { 1225 return markOopDesc::lock_mask_in_place; 1226 } 1227 1228 uintptr_t Universe::verify_mark_bits() { 1229 intptr_t mask = verify_mark_mask(); 1230 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1231 assert((bits & ~mask) == 0, "no stray header bits"); 1232 return bits; 1233 } 1234 #endif // PRODUCT 1235 1236 1237 void Universe::compute_verify_oop_data() { 1238 verify_oop_mask(); 1239 verify_oop_bits(); 1240 verify_mark_mask(); 1241 verify_mark_bits(); 1242 } 1243 1244 1245 void LatestMethodCache::init(Klass* k, Method* m) { 1246 if (!UseSharedSpaces) { 1247 _klass = k; 1248 } 1249 #ifndef PRODUCT 1250 else { 1251 // sharing initilization should have already set up _klass 1252 assert(_klass != NULL, "just checking"); 1253 } 1254 #endif 1255 1256 _method_idnum = m->method_idnum(); 1257 assert(_method_idnum >= 0, "sanity check"); 1258 } 1259 1260 1261 Method* LatestMethodCache::get_method() { 1262 if (klass() == NULL) return NULL; 1263 InstanceKlass* ik = InstanceKlass::cast(klass()); 1264 Method* m = ik->method_with_idnum(method_idnum()); 1265 assert(m != NULL, "sanity check"); 1266 return m; 1267 } 1268 1269 1270 #ifdef ASSERT 1271 // Release dummy object(s) at bottom of heap 1272 bool Universe::release_fullgc_alot_dummy() { 1273 MutexLocker ml(FullGCALot_lock); 1274 if (_fullgc_alot_dummy_array != NULL) { 1275 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1276 // No more dummies to release, release entire array instead 1277 _fullgc_alot_dummy_array = NULL; 1278 return false; 1279 } 1280 if (!UseConcMarkSweepGC) { 1281 // Release dummy at bottom of old generation 1282 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1283 } 1284 // Release dummy at bottom of permanent generation 1285 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1286 } 1287 return true; 1288 } 1289 1290 #endif // ASSERT