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 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 119 oop Universe::_out_of_memory_error_java_heap = NULL; 120 oop Universe::_out_of_memory_error_metaspace = NULL; 121 oop Universe::_out_of_memory_error_class_metaspace = NULL; 122 oop Universe::_out_of_memory_error_array_size = NULL; 123 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 124 oop Universe::_out_of_memory_error_realloc_objects = NULL; 125 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 126 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 127 bool Universe::_verify_in_progress = false; 128 oop Universe::_null_ptr_exception_instance = NULL; 129 oop Universe::_arithmetic_exception_instance = NULL; 130 oop Universe::_virtual_machine_error_instance = NULL; 131 oop Universe::_vm_exception = NULL; 132 oop Universe::_allocation_context_notification_obj = NULL; 133 134 Array<int>* Universe::_the_empty_int_array = NULL; 135 Array<u2>* Universe::_the_empty_short_array = NULL; 136 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 137 Array<Method*>* Universe::_the_empty_method_array = NULL; 138 139 // These variables are guarded by FullGCALot_lock. 140 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 141 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 142 143 // Heap 144 int Universe::_verify_count = 0; 145 146 // Oop verification (see MacroAssembler::verify_oop) 147 uintptr_t Universe::_verify_oop_mask = 0; 148 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 149 150 int Universe::_base_vtable_size = 0; 151 bool Universe::_bootstrapping = false; 152 bool Universe::_fully_initialized = false; 153 154 size_t Universe::_heap_capacity_at_last_gc; 155 size_t Universe::_heap_used_at_last_gc = 0; 156 157 CollectedHeap* Universe::_collectedHeap = NULL; 158 159 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 160 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 161 address Universe::_narrow_ptrs_base; 162 163 void Universe::basic_type_classes_do(void f(Klass*)) { 164 f(boolArrayKlassObj()); 165 f(byteArrayKlassObj()); 166 f(charArrayKlassObj()); 167 f(intArrayKlassObj()); 168 f(shortArrayKlassObj()); 169 f(longArrayKlassObj()); 170 f(singleArrayKlassObj()); 171 f(doubleArrayKlassObj()); 172 } 173 174 void Universe::oops_do(OopClosure* f, bool do_all) { 175 176 f->do_oop((oop*) &_int_mirror); 177 f->do_oop((oop*) &_float_mirror); 178 f->do_oop((oop*) &_double_mirror); 179 f->do_oop((oop*) &_byte_mirror); 180 f->do_oop((oop*) &_bool_mirror); 181 f->do_oop((oop*) &_char_mirror); 182 f->do_oop((oop*) &_long_mirror); 183 f->do_oop((oop*) &_short_mirror); 184 f->do_oop((oop*) &_void_mirror); 185 186 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 187 f->do_oop((oop*) &_mirrors[i]); 188 } 189 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 190 191 f->do_oop((oop*)&_the_empty_class_klass_array); 192 f->do_oop((oop*)&_the_null_string); 193 f->do_oop((oop*)&_the_min_jint_string); 194 f->do_oop((oop*)&_out_of_memory_error_java_heap); 195 f->do_oop((oop*)&_out_of_memory_error_metaspace); 196 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 197 f->do_oop((oop*)&_out_of_memory_error_array_size); 198 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 199 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 200 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 201 f->do_oop((oop*)&_null_ptr_exception_instance); 202 f->do_oop((oop*)&_arithmetic_exception_instance); 203 f->do_oop((oop*)&_virtual_machine_error_instance); 204 f->do_oop((oop*)&_main_thread_group); 205 f->do_oop((oop*)&_system_thread_group); 206 f->do_oop((oop*)&_vm_exception); 207 f->do_oop((oop*)&_allocation_context_notification_obj); 208 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 209 } 210 211 // Serialize metadata in and out of CDS archive, not oops. 212 void Universe::serialize(SerializeClosure* f, bool do_all) { 213 214 f->do_ptr((void**)&_boolArrayKlassObj); 215 f->do_ptr((void**)&_byteArrayKlassObj); 216 f->do_ptr((void**)&_charArrayKlassObj); 217 f->do_ptr((void**)&_intArrayKlassObj); 218 f->do_ptr((void**)&_shortArrayKlassObj); 219 f->do_ptr((void**)&_longArrayKlassObj); 220 f->do_ptr((void**)&_singleArrayKlassObj); 221 f->do_ptr((void**)&_doubleArrayKlassObj); 222 f->do_ptr((void**)&_objectArrayKlassObj); 223 224 { 225 for (int i = 0; i < T_VOID+1; i++) { 226 if (_typeArrayKlassObjs[i] != NULL) { 227 assert(i >= T_BOOLEAN, "checking"); 228 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 229 } else if (do_all) { 230 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 231 } 232 } 233 } 234 235 f->do_ptr((void**)&_the_array_interfaces_array); 236 f->do_ptr((void**)&_the_empty_int_array); 237 f->do_ptr((void**)&_the_empty_short_array); 238 f->do_ptr((void**)&_the_empty_method_array); 239 f->do_ptr((void**)&_the_empty_klass_array); 240 _finalizer_register_cache->serialize(f); 241 _loader_addClass_cache->serialize(f); 242 _pd_implies_cache->serialize(f); 243 _throw_illegal_access_error_cache->serialize(f); 244 _do_stack_walk_cache->serialize(f); 245 } 246 247 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 248 if (size < alignment || size % alignment != 0) { 249 vm_exit_during_initialization( 250 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 251 } 252 } 253 254 void initialize_basic_type_klass(Klass* k, TRAPS) { 255 Klass* ok = SystemDictionary::Object_klass(); 256 if (UseSharedSpaces) { 257 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 258 assert(k->super() == ok, "u3"); 259 k->restore_unshareable_info(loader_data, Handle(), CHECK); 260 } else { 261 k->initialize_supers(ok, CHECK); 262 } 263 k->append_to_sibling_list(); 264 } 265 266 void Universe::genesis(TRAPS) { 267 ResourceMark rm; 268 269 { FlagSetting fs(_bootstrapping, true); 270 271 { MutexLocker mc(Compile_lock); 272 273 // determine base vtable size; without that we cannot create the array klasses 274 compute_base_vtable_size(); 275 276 if (!UseSharedSpaces) { 277 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 278 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 279 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 280 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 281 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 282 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 283 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 284 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 285 286 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 287 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 288 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 289 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 290 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 291 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 292 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 293 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 294 295 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 296 297 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 298 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 299 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 300 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 301 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 302 } 303 } 304 305 vmSymbols::initialize(CHECK); 306 307 SystemDictionary::initialize(CHECK); 308 309 Klass* ok = SystemDictionary::Object_klass(); 310 311 _the_null_string = StringTable::intern("null", CHECK); 312 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 313 314 if (UseSharedSpaces) { 315 // Verify shared interfaces array. 316 assert(_the_array_interfaces_array->at(0) == 317 SystemDictionary::Cloneable_klass(), "u3"); 318 assert(_the_array_interfaces_array->at(1) == 319 SystemDictionary::Serializable_klass(), "u3"); 320 MetaspaceShared::fixup_shared_string_regions(); 321 } else { 322 // Set up shared interfaces array. (Do this before supers are set up.) 323 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 324 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 325 } 326 327 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 328 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 329 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 330 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 331 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 332 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 333 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 334 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 335 } // end of core bootstrapping 336 337 // Maybe this could be lifted up now that object array can be initialized 338 // during the bootstrapping. 339 340 // OLD 341 // Initialize _objectArrayKlass after core bootstraping to make 342 // sure the super class is set up properly for _objectArrayKlass. 343 // --- 344 // NEW 345 // Since some of the old system object arrays have been converted to 346 // ordinary object arrays, _objectArrayKlass will be loaded when 347 // SystemDictionary::initialize(CHECK); is run. See the extra check 348 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 349 _objectArrayKlassObj = InstanceKlass:: 350 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 351 // OLD 352 // Add the class to the class hierarchy manually to make sure that 353 // its vtable is initialized after core bootstrapping is completed. 354 // --- 355 // New 356 // Have already been initialized. 357 _objectArrayKlassObj->append_to_sibling_list(); 358 359 // Compute is_jdk version flags. 360 // Only 1.3 or later has the java.lang.Shutdown class. 361 // Only 1.4 or later has the java.lang.CharSequence interface. 362 // Only 1.5 or later has the java.lang.management.MemoryUsage class. 363 if (JDK_Version::is_partially_initialized()) { 364 uint8_t jdk_version; 365 Klass* k = SystemDictionary::resolve_or_null( 366 vmSymbols::java_lang_management_MemoryUsage(), THREAD); 367 CLEAR_PENDING_EXCEPTION; // ignore exceptions 368 if (k == NULL) { 369 k = SystemDictionary::resolve_or_null( 370 vmSymbols::java_lang_CharSequence(), THREAD); 371 CLEAR_PENDING_EXCEPTION; // ignore exceptions 372 if (k == NULL) { 373 k = SystemDictionary::resolve_or_null( 374 vmSymbols::java_lang_Shutdown(), THREAD); 375 CLEAR_PENDING_EXCEPTION; // ignore exceptions 376 if (k == NULL) { 377 jdk_version = 2; 378 } else { 379 jdk_version = 3; 380 } 381 } else { 382 jdk_version = 4; 383 } 384 } else { 385 jdk_version = 5; 386 } 387 JDK_Version::fully_initialize(jdk_version); 388 } 389 390 #ifdef ASSERT 391 if (FullGCALot) { 392 // Allocate an array of dummy objects. 393 // We'd like these to be at the bottom of the old generation, 394 // so that when we free one and then collect, 395 // (almost) the whole heap moves 396 // and we find out if we actually update all the oops correctly. 397 // But we can't allocate directly in the old generation, 398 // so we allocate wherever, and hope that the first collection 399 // moves these objects to the bottom of the old generation. 400 // We can allocate directly in the permanent generation, so we do. 401 int size; 402 if (UseConcMarkSweepGC) { 403 warning("Using +FullGCALot with concurrent mark sweep gc " 404 "will not force all objects to relocate"); 405 size = FullGCALotDummies; 406 } else { 407 size = FullGCALotDummies * 2; 408 } 409 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 410 objArrayHandle dummy_array(THREAD, naked_array); 411 int i = 0; 412 while (i < size) { 413 // Allocate dummy in old generation 414 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 415 dummy_array->obj_at_put(i++, dummy); 416 } 417 { 418 // Only modify the global variable inside the mutex. 419 // If we had a race to here, the other dummy_array instances 420 // and their elements just get dropped on the floor, which is fine. 421 MutexLocker ml(FullGCALot_lock); 422 if (_fullgc_alot_dummy_array == NULL) { 423 _fullgc_alot_dummy_array = dummy_array(); 424 } 425 } 426 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 427 } 428 #endif 429 430 // Initialize dependency array for null class loader 431 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 432 433 } 434 435 // CDS support for patching vtables in metadata in the shared archive. 436 // All types inherited from Metadata have vtables, but not types inherited 437 // from MetaspaceObj, because the latter does not have virtual functions. 438 // If the metadata type has a vtable, it cannot be shared in the read-only 439 // section of the CDS archive, because the vtable pointer is patched. 440 static inline void add_vtable(void** list, int* n, void* o, int count) { 441 guarantee((*n) < count, "vtable list too small"); 442 void* vtable = dereference_vptr(o); 443 assert(*(void**)(vtable) != NULL, "invalid vtable"); 444 list[(*n)++] = vtable; 445 } 446 447 void Universe::init_self_patching_vtbl_list(void** list, int count) { 448 int n = 0; 449 { InstanceKlass o; add_vtable(list, &n, &o, count); } 450 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 451 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 452 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 453 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 454 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 455 { Method o; add_vtable(list, &n, &o, count); } 456 { ConstantPool o; add_vtable(list, &n, &o, count); } 457 } 458 459 void Universe::initialize_basic_type_mirrors(TRAPS) { 460 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 461 _int_mirror = 462 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 463 _float_mirror = 464 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 465 _double_mirror = 466 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 467 _byte_mirror = 468 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 469 _bool_mirror = 470 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 471 _char_mirror = 472 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 473 _long_mirror = 474 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 475 _short_mirror = 476 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 477 _void_mirror = 478 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 479 480 _mirrors[T_INT] = _int_mirror; 481 _mirrors[T_FLOAT] = _float_mirror; 482 _mirrors[T_DOUBLE] = _double_mirror; 483 _mirrors[T_BYTE] = _byte_mirror; 484 _mirrors[T_BOOLEAN] = _bool_mirror; 485 _mirrors[T_CHAR] = _char_mirror; 486 _mirrors[T_LONG] = _long_mirror; 487 _mirrors[T_SHORT] = _short_mirror; 488 _mirrors[T_VOID] = _void_mirror; 489 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 490 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 491 } 492 493 void Universe::fixup_mirrors(TRAPS) { 494 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 495 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 496 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 497 // that the number of objects allocated at this point is very small. 498 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 499 HandleMark hm(THREAD); 500 // Cache the start of the static fields 501 InstanceMirrorKlass::init_offset_of_static_fields(); 502 503 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 504 int list_length = list->length(); 505 for (int i = 0; i < list_length; i++) { 506 Klass* k = list->at(i); 507 assert(k->is_klass(), "List should only hold classes"); 508 EXCEPTION_MARK; 509 KlassHandle kh(THREAD, k); 510 java_lang_Class::fixup_mirror(kh, CATCH); 511 } 512 delete java_lang_Class::fixup_mirror_list(); 513 java_lang_Class::set_fixup_mirror_list(NULL); 514 } 515 516 static bool has_run_finalizers_on_exit = false; 517 518 void Universe::run_finalizers_on_exit() { 519 if (has_run_finalizers_on_exit) return; 520 has_run_finalizers_on_exit = true; 521 522 // Called on VM exit. This ought to be run in a separate thread. 523 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 524 { 525 PRESERVE_EXCEPTION_MARK; 526 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 527 JavaValue result(T_VOID); 528 JavaCalls::call_static( 529 &result, 530 finalizer_klass, 531 vmSymbols::run_finalizers_on_exit_name(), 532 vmSymbols::void_method_signature(), 533 THREAD 534 ); 535 // Ignore any pending exceptions 536 CLEAR_PENDING_EXCEPTION; 537 } 538 } 539 540 541 // initialize_vtable could cause gc if 542 // 1) we specified true to initialize_vtable and 543 // 2) this ran after gc was enabled 544 // In case those ever change we use handles for oops 545 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 546 // init vtable of k and all subclasses 547 Klass* ko = k_h(); 548 klassVtable* vt = ko->vtable(); 549 if (vt) vt->initialize_vtable(false, CHECK); 550 if (ko->is_instance_klass()) { 551 for (KlassHandle s_h(THREAD, ko->subklass()); 552 s_h() != NULL; 553 s_h = KlassHandle(THREAD, s_h()->next_sibling())) { 554 reinitialize_vtable_of(s_h, CHECK); 555 } 556 } 557 } 558 559 560 void initialize_itable_for_klass(Klass* k, TRAPS) { 561 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 562 } 563 564 565 void Universe::reinitialize_itables(TRAPS) { 566 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 567 568 } 569 570 571 bool Universe::on_page_boundary(void* addr) { 572 return ((uintptr_t) addr) % os::vm_page_size() == 0; 573 } 574 575 576 bool Universe::should_fill_in_stack_trace(Handle throwable) { 577 // never attempt to fill in the stack trace of preallocated errors that do not have 578 // backtrace. These errors are kept alive forever and may be "re-used" when all 579 // preallocated errors with backtrace have been consumed. Also need to avoid 580 // a potential loop which could happen if an out of memory occurs when attempting 581 // to allocate the backtrace. 582 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 583 (throwable() != Universe::_out_of_memory_error_metaspace) && 584 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 585 (throwable() != Universe::_out_of_memory_error_array_size) && 586 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) && 587 (throwable() != Universe::_out_of_memory_error_realloc_objects)); 588 } 589 590 591 oop Universe::gen_out_of_memory_error(oop default_err) { 592 // generate an out of memory error: 593 // - if there is a preallocated error with backtrace available then return it wth 594 // a filled in stack trace. 595 // - if there are no preallocated errors with backtrace available then return 596 // an error without backtrace. 597 int next; 598 if (_preallocated_out_of_memory_error_avail_count > 0) { 599 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 600 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 601 } else { 602 next = -1; 603 } 604 if (next < 0) { 605 // all preallocated errors have been used. 606 // return default 607 return default_err; 608 } else { 609 // get the error object at the slot and set set it to NULL so that the 610 // array isn't keeping it alive anymore. 611 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 612 assert(exc != NULL, "slot has been used already"); 613 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 614 615 // use the message from the default error 616 oop msg = java_lang_Throwable::message(default_err); 617 assert(msg != NULL, "no message"); 618 java_lang_Throwable::set_message(exc, msg); 619 620 // populate the stack trace and return it. 621 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 622 return exc; 623 } 624 } 625 626 intptr_t Universe::_non_oop_bits = 0; 627 628 void* Universe::non_oop_word() { 629 // Neither the high bits nor the low bits of this value is allowed 630 // to look like (respectively) the high or low bits of a real oop. 631 // 632 // High and low are CPU-specific notions, but low always includes 633 // the low-order bit. Since oops are always aligned at least mod 4, 634 // setting the low-order bit will ensure that the low half of the 635 // word will never look like that of a real oop. 636 // 637 // Using the OS-supplied non-memory-address word (usually 0 or -1) 638 // will take care of the high bits, however many there are. 639 640 if (_non_oop_bits == 0) { 641 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 642 } 643 644 return (void*)_non_oop_bits; 645 } 646 647 jint universe_init() { 648 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 649 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 650 "LogHeapWordSize is incorrect."); 651 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 652 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 653 "oop size is not not a multiple of HeapWord size"); 654 TraceTime timer("Genesis", TraceStartupTime); 655 JavaClasses::compute_hard_coded_offsets(); 656 657 jint status = Universe::initialize_heap(); 658 if (status != JNI_OK) { 659 return status; 660 } 661 662 Metaspace::global_initialize(); 663 664 // Checks 'AfterMemoryInit' constraints. 665 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) { 666 return JNI_EINVAL; 667 } 668 669 // Create memory for metadata. Must be after initializing heap for 670 // DumpSharedSpaces. 671 ClassLoaderData::init_null_class_loader_data(); 672 673 // We have a heap so create the Method* caches before 674 // Metaspace::initialize_shared_spaces() tries to populate them. 675 Universe::_finalizer_register_cache = new LatestMethodCache(); 676 Universe::_loader_addClass_cache = new LatestMethodCache(); 677 Universe::_pd_implies_cache = new LatestMethodCache(); 678 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 679 Universe::_do_stack_walk_cache = new LatestMethodCache(); 680 681 if (UseSharedSpaces) { 682 // Read the data structures supporting the shared spaces (shared 683 // system dictionary, symbol table, etc.). After that, access to 684 // the file (other than the mapped regions) is no longer needed, and 685 // the file is closed. Closing the file does not affect the 686 // currently mapped regions. 687 MetaspaceShared::initialize_shared_spaces(); 688 StringTable::create_table(); 689 } else { 690 SymbolTable::create_table(); 691 StringTable::create_table(); 692 ClassLoader::create_package_info_table(); 693 694 if (DumpSharedSpaces) { 695 MetaspaceShared::prepare_for_dumping(); 696 } 697 } 698 699 return JNI_OK; 700 } 701 702 CollectedHeap* Universe::create_heap() { 703 assert(_collectedHeap == NULL, "Heap already created"); 704 #if !INCLUDE_ALL_GCS 705 if (UseParallelGC) { 706 fatal("UseParallelGC not supported in this VM."); 707 } else if (UseG1GC) { 708 fatal("UseG1GC not supported in this VM."); 709 } else if (UseConcMarkSweepGC) { 710 fatal("UseConcMarkSweepGC not supported in this VM."); 711 #else 712 if (UseParallelGC) { 713 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>(); 714 } else if (UseG1GC) { 715 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>(); 716 } else if (UseConcMarkSweepGC) { 717 return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>(); 718 #endif 719 } else if (UseSerialGC) { 720 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>(); 721 } 722 723 ShouldNotReachHere(); 724 return NULL; 725 } 726 727 // Choose the heap base address and oop encoding mode 728 // when compressed oops are used: 729 // Unscaled - Use 32-bits oops without encoding when 730 // NarrowOopHeapBaseMin + heap_size < 4Gb 731 // ZeroBased - Use zero based compressed oops with encoding when 732 // NarrowOopHeapBaseMin + heap_size < 32Gb 733 // HeapBased - Use compressed oops with heap base + encoding. 734 735 jint Universe::initialize_heap() { 736 jint status = JNI_ERR; 737 738 _collectedHeap = create_heap_ext(); 739 if (_collectedHeap == NULL) { 740 _collectedHeap = create_heap(); 741 } 742 743 status = _collectedHeap->initialize(); 744 if (status != JNI_OK) { 745 return status; 746 } 747 748 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 749 750 #ifdef _LP64 751 if (UseCompressedOops) { 752 // Subtract a page because something can get allocated at heap base. 753 // This also makes implicit null checking work, because the 754 // memory+1 page below heap_base needs to cause a signal. 755 // See needs_explicit_null_check. 756 // Only set the heap base for compressed oops because it indicates 757 // compressed oops for pstack code. 758 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 759 // Didn't reserve heap below 4Gb. Must shift. 760 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 761 } 762 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 763 // Did reserve heap below 32Gb. Can use base == 0; 764 Universe::set_narrow_oop_base(0); 765 } 766 767 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 768 769 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 770 Universe::print_compressed_oops_mode(tty); 771 } 772 773 // Tell tests in which mode we run. 774 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 775 narrow_oop_mode_to_string(narrow_oop_mode()), 776 false)); 777 } 778 // Universe::narrow_oop_base() is one page below the heap. 779 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 780 os::vm_page_size()) || 781 Universe::narrow_oop_base() == NULL, "invalid value"); 782 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 783 Universe::narrow_oop_shift() == 0, "invalid value"); 784 #endif 785 786 // We will never reach the CATCH below since Exceptions::_throw will cause 787 // the VM to exit if an exception is thrown during initialization 788 789 if (UseTLAB) { 790 assert(Universe::heap()->supports_tlab_allocation(), 791 "Should support thread-local allocation buffers"); 792 ThreadLocalAllocBuffer::startup_initialization(); 793 } 794 return JNI_OK; 795 } 796 797 void Universe::print_compressed_oops_mode(outputStream* st) { 798 st->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 799 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 800 801 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 802 803 if (Universe::narrow_oop_base() != 0) { 804 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 805 } 806 807 if (Universe::narrow_oop_shift() != 0) { 808 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 809 } 810 811 if (!Universe::narrow_oop_use_implicit_null_checks()) { 812 st->print(", no protected page in front of the heap"); 813 } 814 st->cr(); 815 } 816 817 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 818 819 assert(alignment <= Arguments::conservative_max_heap_alignment(), 820 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 821 alignment, Arguments::conservative_max_heap_alignment()); 822 823 size_t total_reserved = align_size_up(heap_size, alignment); 824 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 825 "heap size is too big for compressed oops"); 826 827 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size()); 828 assert(!UseLargePages 829 || UseParallelGC 830 || use_large_pages, "Wrong alignment to use large pages"); 831 832 // Now create the space. 833 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages); 834 835 if (total_rs.is_reserved()) { 836 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 837 "must be exactly of required size and alignment"); 838 // We are good. 839 840 if (UseCompressedOops) { 841 // Universe::initialize_heap() will reset this to NULL if unscaled 842 // or zero-based narrow oops are actually used. 843 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 844 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 845 } 846 847 return total_rs; 848 } 849 850 vm_exit_during_initialization( 851 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 852 total_reserved/K)); 853 854 // satisfy compiler 855 ShouldNotReachHere(); 856 return ReservedHeapSpace(0, 0, false); 857 } 858 859 860 // It's the caller's responsibility to ensure glitch-freedom 861 // (if required). 862 void Universe::update_heap_info_at_gc() { 863 _heap_capacity_at_last_gc = heap()->capacity(); 864 _heap_used_at_last_gc = heap()->used(); 865 } 866 867 868 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 869 switch (mode) { 870 case UnscaledNarrowOop: 871 return "32-bit"; 872 case ZeroBasedNarrowOop: 873 return "Zero based"; 874 case DisjointBaseNarrowOop: 875 return "Non-zero disjoint base"; 876 case HeapBasedNarrowOop: 877 return "Non-zero based"; 878 } 879 880 ShouldNotReachHere(); 881 return ""; 882 } 883 884 885 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 886 if (narrow_oop_base_disjoint()) { 887 return DisjointBaseNarrowOop; 888 } 889 890 if (narrow_oop_base() != 0) { 891 return HeapBasedNarrowOop; 892 } 893 894 if (narrow_oop_shift() != 0) { 895 return ZeroBasedNarrowOop; 896 } 897 898 return UnscaledNarrowOop; 899 } 900 901 902 void universe2_init() { 903 EXCEPTION_MARK; 904 Universe::genesis(CATCH); 905 } 906 907 908 bool universe_post_init() { 909 assert(!is_init_completed(), "Error: initialization not yet completed!"); 910 Universe::_fully_initialized = true; 911 EXCEPTION_MARK; 912 { ResourceMark rm; 913 Interpreter::initialize(); // needed for interpreter entry points 914 if (!UseSharedSpaces) { 915 HandleMark hm(THREAD); 916 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 917 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 918 Universe::reinitialize_itables(CHECK_false); 919 } 920 } 921 922 HandleMark hm(THREAD); 923 Klass* k; 924 instanceKlassHandle k_h; 925 // Setup preallocated empty java.lang.Class array 926 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 927 928 // Setup preallocated OutOfMemoryError errors 929 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 930 k_h = instanceKlassHandle(THREAD, k); 931 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 932 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); 933 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); 934 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 935 Universe::_out_of_memory_error_gc_overhead_limit = 936 k_h->allocate_instance(CHECK_false); 937 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false); 938 939 // Setup preallocated NullPointerException 940 // (this is currently used for a cheap & dirty solution in compiler exception handling) 941 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 942 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 943 // Setup preallocated ArithmeticException 944 // (this is currently used for a cheap & dirty solution in compiler exception handling) 945 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 946 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 947 // Virtual Machine Error for when we get into a situation we can't resolve 948 k = SystemDictionary::resolve_or_fail( 949 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 950 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 951 if (!linked) { 952 tty->print_cr("Unable to link/verify VirtualMachineError class"); 953 return false; // initialization failed 954 } 955 Universe::_virtual_machine_error_instance = 956 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 957 958 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 959 960 if (!DumpSharedSpaces) { 961 // These are the only Java fields that are currently set during shared space dumping. 962 // We prefer to not handle this generally, so we always reinitialize these detail messages. 963 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 964 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 965 966 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 967 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 968 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 969 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 970 971 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 972 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 973 974 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 975 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 976 977 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 978 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 979 980 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 981 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 982 983 // Setup the array of errors that have preallocated backtrace 984 k = Universe::_out_of_memory_error_java_heap->klass(); 985 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 986 k_h = instanceKlassHandle(THREAD, k); 987 988 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 989 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 990 for (int i=0; i<len; i++) { 991 oop err = k_h->allocate_instance(CHECK_false); 992 Handle err_h = Handle(THREAD, err); 993 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 994 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 995 } 996 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 997 } 998 999 1000 // Setup static method for registering finalizers 1001 // The finalizer klass must be linked before looking up the method, in 1002 // case it needs to get rewritten. 1003 SystemDictionary::Finalizer_klass()->link_class(CHECK_false); 1004 Method* m = SystemDictionary::Finalizer_klass()->find_method( 1005 vmSymbols::register_method_name(), 1006 vmSymbols::register_method_signature()); 1007 if (m == NULL || !m->is_static()) { 1008 tty->print_cr("Unable to link/verify Finalizer.register method"); 1009 return false; // initialization failed (cannot throw exception yet) 1010 } 1011 Universe::_finalizer_register_cache->init( 1012 SystemDictionary::Finalizer_klass(), m); 1013 1014 SystemDictionary::internal_Unsafe_klass()->link_class(CHECK_false); 1015 m = SystemDictionary::internal_Unsafe_klass()->find_method( 1016 vmSymbols::throwIllegalAccessError_name(), 1017 vmSymbols::void_method_signature()); 1018 if (m != NULL && !m->is_static()) { 1019 // Note null is okay; this method is used in itables, and if it is null, 1020 // then AbstractMethodError is thrown instead. 1021 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method"); 1022 return false; // initialization failed (cannot throw exception yet) 1023 } 1024 Universe::_throw_illegal_access_error_cache->init( 1025 SystemDictionary::internal_Unsafe_klass(), m); 1026 1027 // Setup method for registering loaded classes in class loader vector 1028 SystemDictionary::ClassLoader_klass()->link_class(CHECK_false); 1029 m = SystemDictionary::ClassLoader_klass()->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1030 if (m == NULL || m->is_static()) { 1031 tty->print_cr("Unable to link/verify ClassLoader.addClass method"); 1032 return false; // initialization failed (cannot throw exception yet) 1033 } 1034 Universe::_loader_addClass_cache->init( 1035 SystemDictionary::ClassLoader_klass(), m); 1036 1037 // Setup method for checking protection domain 1038 SystemDictionary::ProtectionDomain_klass()->link_class(CHECK_false); 1039 m = SystemDictionary::ProtectionDomain_klass()-> 1040 find_method(vmSymbols::impliesCreateAccessControlContext_name(), 1041 vmSymbols::void_boolean_signature()); 1042 // Allow NULL which should only happen with bootstrapping. 1043 if (m != NULL) { 1044 if (m->is_static()) { 1045 // NoSuchMethodException doesn't actually work because it tries to run the 1046 // <init> function before java_lang_Class is linked. Print error and exit. 1047 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); 1048 return false; // initialization failed 1049 } 1050 Universe::_pd_implies_cache->init( 1051 SystemDictionary::ProtectionDomain_klass(), m); 1052 } 1053 1054 // Setup method for stack walking 1055 InstanceKlass::cast(SystemDictionary::AbstractStackWalker_klass())->link_class(CHECK_false); 1056 m = InstanceKlass::cast(SystemDictionary::AbstractStackWalker_klass())-> 1057 find_method(vmSymbols::doStackWalk_name(), 1058 vmSymbols::doStackWalk_signature()); 1059 // Allow NULL which should only happen with bootstrapping. 1060 if (m != NULL) { 1061 Universe::_do_stack_walk_cache->init( 1062 SystemDictionary::AbstractStackWalker_klass(), m); 1063 } 1064 1065 // This needs to be done before the first scavenge/gc, since 1066 // it's an input to soft ref clearing policy. 1067 { 1068 MutexLocker x(Heap_lock); 1069 Universe::update_heap_info_at_gc(); 1070 } 1071 1072 // ("weak") refs processing infrastructure initialization 1073 Universe::heap()->post_initialize(); 1074 1075 // Initialize performance counters for metaspaces 1076 MetaspaceCounters::initialize_performance_counters(); 1077 CompressedClassSpaceCounters::initialize_performance_counters(); 1078 1079 MemoryService::add_metaspace_memory_pools(); 1080 1081 MemoryService::set_universe_heap(Universe::heap()); 1082 #if INCLUDE_CDS 1083 SharedClassUtil::initialize(CHECK_false); 1084 #endif 1085 return true; 1086 } 1087 1088 1089 void Universe::compute_base_vtable_size() { 1090 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1091 } 1092 1093 1094 void Universe::print() { 1095 print_on(gclog_or_tty); 1096 } 1097 1098 void Universe::print_on(outputStream* st, bool extended) { 1099 st->print_cr("Heap"); 1100 if (!extended) { 1101 heap()->print_on(st); 1102 } else { 1103 heap()->print_extended_on(st); 1104 } 1105 } 1106 1107 void Universe::print_heap_at_SIGBREAK() { 1108 if (PrintHeapAtSIGBREAK) { 1109 MutexLocker hl(Heap_lock); 1110 print_on(tty); 1111 tty->cr(); 1112 tty->flush(); 1113 } 1114 } 1115 1116 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1117 st->print_cr("{Heap before GC invocations=%u (full %u):", 1118 heap()->total_collections(), 1119 heap()->total_full_collections()); 1120 if (!PrintHeapAtGCExtended || ignore_extended) { 1121 heap()->print_on(st); 1122 } else { 1123 heap()->print_extended_on(st); 1124 } 1125 } 1126 1127 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1128 st->print_cr("Heap after GC invocations=%u (full %u):", 1129 heap()->total_collections(), 1130 heap()->total_full_collections()); 1131 if (!PrintHeapAtGCExtended || ignore_extended) { 1132 heap()->print_on(st); 1133 } else { 1134 heap()->print_extended_on(st); 1135 } 1136 st->print_cr("}"); 1137 } 1138 1139 void Universe::verify(VerifyOption option, const char* prefix, bool silent) { 1140 // The use of _verify_in_progress is a temporary work around for 1141 // 6320749. Don't bother with a creating a class to set and clear 1142 // it since it is only used in this method and the control flow is 1143 // straight forward. 1144 _verify_in_progress = true; 1145 1146 COMPILER2_PRESENT( 1147 assert(!DerivedPointerTable::is_active(), 1148 "DPT should not be active during verification " 1149 "(of thread stacks below)"); 1150 ) 1151 1152 ResourceMark rm; 1153 HandleMark hm; // Handles created during verification can be zapped 1154 _verify_count++; 1155 1156 if (!silent) gclog_or_tty->print("%s", prefix); 1157 if (!silent) gclog_or_tty->print("[Verifying "); 1158 if (!silent) gclog_or_tty->print("threads "); 1159 Threads::verify(); 1160 if (!silent) gclog_or_tty->print("heap "); 1161 heap()->verify(silent, option); 1162 if (!silent) gclog_or_tty->print("syms "); 1163 SymbolTable::verify(); 1164 if (!silent) gclog_or_tty->print("strs "); 1165 StringTable::verify(); 1166 { 1167 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1168 if (!silent) gclog_or_tty->print("zone "); 1169 CodeCache::verify(); 1170 } 1171 if (!silent) gclog_or_tty->print("dict "); 1172 SystemDictionary::verify(); 1173 #ifndef PRODUCT 1174 if (!silent) gclog_or_tty->print("cldg "); 1175 ClassLoaderDataGraph::verify(); 1176 #endif 1177 if (!silent) gclog_or_tty->print("metaspace chunks "); 1178 MetaspaceAux::verify_free_chunks(); 1179 if (!silent) gclog_or_tty->print("hand "); 1180 JNIHandles::verify(); 1181 if (!silent) gclog_or_tty->print("C-heap "); 1182 os::check_heap(); 1183 if (!silent) gclog_or_tty->print("code cache "); 1184 CodeCache::verify_oops(); 1185 if (!silent) gclog_or_tty->print_cr("]"); 1186 1187 _verify_in_progress = false; 1188 } 1189 1190 1191 #ifndef PRODUCT 1192 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1193 assert(low_boundary < high_boundary, "bad interval"); 1194 1195 // decide which low-order bits we require to be clear: 1196 size_t alignSize = MinObjAlignmentInBytes; 1197 size_t min_object_size = CollectedHeap::min_fill_size(); 1198 1199 // make an inclusive limit: 1200 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1201 uintptr_t min = (uintptr_t)low_boundary; 1202 assert(min < max, "bad interval"); 1203 uintptr_t diff = max ^ min; 1204 1205 // throw away enough low-order bits to make the diff vanish 1206 uintptr_t mask = (uintptr_t)(-1); 1207 while ((mask & diff) != 0) 1208 mask <<= 1; 1209 uintptr_t bits = (min & mask); 1210 assert(bits == (max & mask), "correct mask"); 1211 // check an intermediate value between min and max, just to make sure: 1212 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1213 1214 // require address alignment, too: 1215 mask |= (alignSize - 1); 1216 1217 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1218 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1219 } 1220 _verify_oop_mask = mask; 1221 _verify_oop_bits = bits; 1222 } 1223 1224 // Oop verification (see MacroAssembler::verify_oop) 1225 1226 uintptr_t Universe::verify_oop_mask() { 1227 MemRegion m = heap()->reserved_region(); 1228 calculate_verify_data(m.start(), m.end()); 1229 return _verify_oop_mask; 1230 } 1231 1232 uintptr_t Universe::verify_oop_bits() { 1233 MemRegion m = heap()->reserved_region(); 1234 calculate_verify_data(m.start(), m.end()); 1235 return _verify_oop_bits; 1236 } 1237 1238 uintptr_t Universe::verify_mark_mask() { 1239 return markOopDesc::lock_mask_in_place; 1240 } 1241 1242 uintptr_t Universe::verify_mark_bits() { 1243 intptr_t mask = verify_mark_mask(); 1244 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1245 assert((bits & ~mask) == 0, "no stray header bits"); 1246 return bits; 1247 } 1248 #endif // PRODUCT 1249 1250 1251 void Universe::compute_verify_oop_data() { 1252 verify_oop_mask(); 1253 verify_oop_bits(); 1254 verify_mark_mask(); 1255 verify_mark_bits(); 1256 } 1257 1258 1259 void LatestMethodCache::init(Klass* k, Method* m) { 1260 if (!UseSharedSpaces) { 1261 _klass = k; 1262 } 1263 #ifndef PRODUCT 1264 else { 1265 // sharing initilization should have already set up _klass 1266 assert(_klass != NULL, "just checking"); 1267 } 1268 #endif 1269 1270 _method_idnum = m->method_idnum(); 1271 assert(_method_idnum >= 0, "sanity check"); 1272 } 1273 1274 1275 Method* LatestMethodCache::get_method() { 1276 if (klass() == NULL) return NULL; 1277 InstanceKlass* ik = InstanceKlass::cast(klass()); 1278 Method* m = ik->method_with_idnum(method_idnum()); 1279 assert(m != NULL, "sanity check"); 1280 return m; 1281 } 1282 1283 1284 #ifdef ASSERT 1285 // Release dummy object(s) at bottom of heap 1286 bool Universe::release_fullgc_alot_dummy() { 1287 MutexLocker ml(FullGCALot_lock); 1288 if (_fullgc_alot_dummy_array != NULL) { 1289 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1290 // No more dummies to release, release entire array instead 1291 _fullgc_alot_dummy_array = NULL; 1292 return false; 1293 } 1294 if (!UseConcMarkSweepGC) { 1295 // Release dummy at bottom of old generation 1296 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1297 } 1298 // Release dummy at bottom of permanent generation 1299 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1300 } 1301 return true; 1302 } 1303 1304 #endif // ASSERT