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/genRemSet.hpp" 39 #include "gc/shared/generation.hpp" 40 #include "gc/shared/space.hpp" 41 #include "interpreter/interpreter.hpp" 42 #include "memory/filemap.hpp" 43 #include "memory/metadataFactory.hpp" 44 #include "memory/metaspaceShared.hpp" 45 #include "memory/oopFactory.hpp" 46 #include "memory/universe.hpp" 47 #include "memory/universe.inline.hpp" 48 #include "oops/constantPool.hpp" 49 #include "oops/instanceClassLoaderKlass.hpp" 50 #include "oops/instanceKlass.hpp" 51 #include "oops/instanceMirrorKlass.hpp" 52 #include "oops/instanceRefKlass.hpp" 53 #include "oops/objArrayOop.inline.hpp" 54 #include "oops/oop.inline.hpp" 55 #include "oops/typeArrayKlass.hpp" 56 #include "prims/jvmtiRedefineClassesTrace.hpp" 57 #include "runtime/arguments.hpp" 58 #include "runtime/atomic.inline.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_ext.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 int Universe::_base_vtable_size = 0; 146 bool Universe::_bootstrapping = false; 147 bool Universe::_fully_initialized = false; 148 149 size_t Universe::_heap_capacity_at_last_gc; 150 size_t Universe::_heap_used_at_last_gc = 0; 151 152 CollectedHeap* Universe::_collectedHeap = NULL; 153 154 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 155 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 156 address Universe::_narrow_ptrs_base; 157 158 void Universe::basic_type_classes_do(void f(Klass*)) { 159 f(boolArrayKlassObj()); 160 f(byteArrayKlassObj()); 161 f(charArrayKlassObj()); 162 f(intArrayKlassObj()); 163 f(shortArrayKlassObj()); 164 f(longArrayKlassObj()); 165 f(singleArrayKlassObj()); 166 f(doubleArrayKlassObj()); 167 } 168 169 void Universe::oops_do(OopClosure* f, bool do_all) { 170 171 f->do_oop((oop*) &_int_mirror); 172 f->do_oop((oop*) &_float_mirror); 173 f->do_oop((oop*) &_double_mirror); 174 f->do_oop((oop*) &_byte_mirror); 175 f->do_oop((oop*) &_bool_mirror); 176 f->do_oop((oop*) &_char_mirror); 177 f->do_oop((oop*) &_long_mirror); 178 f->do_oop((oop*) &_short_mirror); 179 f->do_oop((oop*) &_void_mirror); 180 181 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 182 f->do_oop((oop*) &_mirrors[i]); 183 } 184 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 185 186 f->do_oop((oop*)&_the_empty_class_klass_array); 187 f->do_oop((oop*)&_the_null_string); 188 f->do_oop((oop*)&_the_min_jint_string); 189 f->do_oop((oop*)&_out_of_memory_error_java_heap); 190 f->do_oop((oop*)&_out_of_memory_error_metaspace); 191 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 192 f->do_oop((oop*)&_out_of_memory_error_array_size); 193 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 194 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 195 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 196 f->do_oop((oop*)&_null_ptr_exception_instance); 197 f->do_oop((oop*)&_arithmetic_exception_instance); 198 f->do_oop((oop*)&_virtual_machine_error_instance); 199 f->do_oop((oop*)&_main_thread_group); 200 f->do_oop((oop*)&_system_thread_group); 201 f->do_oop((oop*)&_vm_exception); 202 f->do_oop((oop*)&_allocation_context_notification_obj); 203 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 204 } 205 206 // Serialize metadata in and out of CDS archive, not oops. 207 void Universe::serialize(SerializeClosure* f, bool do_all) { 208 209 f->do_ptr((void**)&_boolArrayKlassObj); 210 f->do_ptr((void**)&_byteArrayKlassObj); 211 f->do_ptr((void**)&_charArrayKlassObj); 212 f->do_ptr((void**)&_intArrayKlassObj); 213 f->do_ptr((void**)&_shortArrayKlassObj); 214 f->do_ptr((void**)&_longArrayKlassObj); 215 f->do_ptr((void**)&_singleArrayKlassObj); 216 f->do_ptr((void**)&_doubleArrayKlassObj); 217 f->do_ptr((void**)&_objectArrayKlassObj); 218 219 { 220 for (int i = 0; i < T_VOID+1; i++) { 221 if (_typeArrayKlassObjs[i] != NULL) { 222 assert(i >= T_BOOLEAN, "checking"); 223 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 224 } else if (do_all) { 225 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 226 } 227 } 228 } 229 230 f->do_ptr((void**)&_the_array_interfaces_array); 231 f->do_ptr((void**)&_the_empty_int_array); 232 f->do_ptr((void**)&_the_empty_short_array); 233 f->do_ptr((void**)&_the_empty_method_array); 234 f->do_ptr((void**)&_the_empty_klass_array); 235 _finalizer_register_cache->serialize(f); 236 _loader_addClass_cache->serialize(f); 237 _pd_implies_cache->serialize(f); 238 _throw_illegal_access_error_cache->serialize(f); 239 } 240 241 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 242 if (size < alignment || size % alignment != 0) { 243 vm_exit_during_initialization( 244 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 245 } 246 } 247 248 void initialize_basic_type_klass(Klass* k, TRAPS) { 249 Klass* ok = SystemDictionary::Object_klass(); 250 if (UseSharedSpaces) { 251 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 252 assert(k->super() == ok, "u3"); 253 k->restore_unshareable_info(loader_data, Handle(), CHECK); 254 } else { 255 k->initialize_supers(ok, CHECK); 256 } 257 k->append_to_sibling_list(); 258 } 259 260 void Universe::genesis(TRAPS) { 261 ResourceMark rm; 262 263 { FlagSetting fs(_bootstrapping, true); 264 265 { MutexLocker mc(Compile_lock); 266 267 // determine base vtable size; without that we cannot create the array klasses 268 compute_base_vtable_size(); 269 270 if (!UseSharedSpaces) { 271 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 272 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 273 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 274 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 275 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 276 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 277 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 278 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 279 280 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 281 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 282 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 283 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 284 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 285 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 286 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 287 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 288 289 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 290 291 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 292 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 293 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 294 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 295 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 296 } 297 } 298 299 vmSymbols::initialize(CHECK); 300 301 SystemDictionary::initialize(CHECK); 302 303 Klass* ok = SystemDictionary::Object_klass(); 304 305 _the_null_string = StringTable::intern("null", CHECK); 306 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 307 308 if (UseSharedSpaces) { 309 // Verify shared interfaces array. 310 assert(_the_array_interfaces_array->at(0) == 311 SystemDictionary::Cloneable_klass(), "u3"); 312 assert(_the_array_interfaces_array->at(1) == 313 SystemDictionary::Serializable_klass(), "u3"); 314 } else { 315 // Set up shared interfaces array. (Do this before supers are set up.) 316 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 317 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 318 } 319 320 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 321 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 322 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 323 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 324 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 325 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 326 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 327 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 328 } // end of core bootstrapping 329 330 // Maybe this could be lifted up now that object array can be initialized 331 // during the bootstrapping. 332 333 // OLD 334 // Initialize _objectArrayKlass after core bootstraping to make 335 // sure the super class is set up properly for _objectArrayKlass. 336 // --- 337 // NEW 338 // Since some of the old system object arrays have been converted to 339 // ordinary object arrays, _objectArrayKlass will be loaded when 340 // SystemDictionary::initialize(CHECK); is run. See the extra check 341 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 342 _objectArrayKlassObj = InstanceKlass:: 343 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 344 // OLD 345 // Add the class to the class hierarchy manually to make sure that 346 // its vtable is initialized after core bootstrapping is completed. 347 // --- 348 // New 349 // Have already been initialized. 350 _objectArrayKlassObj->append_to_sibling_list(); 351 352 // Compute is_jdk version flags. 353 // Only 1.3 or later has the java.lang.Shutdown class. 354 // Only 1.4 or later has the java.lang.CharSequence interface. 355 // Only 1.5 or later has the java.lang.management.MemoryUsage class. 356 if (JDK_Version::is_partially_initialized()) { 357 uint8_t jdk_version; 358 Klass* k = SystemDictionary::resolve_or_null( 359 vmSymbols::java_lang_management_MemoryUsage(), THREAD); 360 CLEAR_PENDING_EXCEPTION; // ignore exceptions 361 if (k == NULL) { 362 k = SystemDictionary::resolve_or_null( 363 vmSymbols::java_lang_CharSequence(), THREAD); 364 CLEAR_PENDING_EXCEPTION; // ignore exceptions 365 if (k == NULL) { 366 k = SystemDictionary::resolve_or_null( 367 vmSymbols::java_lang_Shutdown(), THREAD); 368 CLEAR_PENDING_EXCEPTION; // ignore exceptions 369 if (k == NULL) { 370 jdk_version = 2; 371 } else { 372 jdk_version = 3; 373 } 374 } else { 375 jdk_version = 4; 376 } 377 } else { 378 jdk_version = 5; 379 } 380 JDK_Version::fully_initialize(jdk_version); 381 } 382 383 #ifdef ASSERT 384 if (FullGCALot) { 385 // Allocate an array of dummy objects. 386 // We'd like these to be at the bottom of the old generation, 387 // so that when we free one and then collect, 388 // (almost) the whole heap moves 389 // and we find out if we actually update all the oops correctly. 390 // But we can't allocate directly in the old generation, 391 // so we allocate wherever, and hope that the first collection 392 // moves these objects to the bottom of the old generation. 393 // We can allocate directly in the permanent generation, so we do. 394 int size; 395 if (UseConcMarkSweepGC) { 396 warning("Using +FullGCALot with concurrent mark sweep gc " 397 "will not force all objects to relocate"); 398 size = FullGCALotDummies; 399 } else { 400 size = FullGCALotDummies * 2; 401 } 402 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 403 objArrayHandle dummy_array(THREAD, naked_array); 404 int i = 0; 405 while (i < size) { 406 // Allocate dummy in old generation 407 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); 408 dummy_array->obj_at_put(i++, dummy); 409 } 410 { 411 // Only modify the global variable inside the mutex. 412 // If we had a race to here, the other dummy_array instances 413 // and their elements just get dropped on the floor, which is fine. 414 MutexLocker ml(FullGCALot_lock); 415 if (_fullgc_alot_dummy_array == NULL) { 416 _fullgc_alot_dummy_array = dummy_array(); 417 } 418 } 419 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 420 } 421 #endif 422 423 // Initialize dependency array for null class loader 424 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 425 426 } 427 428 // CDS support for patching vtables in metadata in the shared archive. 429 // All types inherited from Metadata have vtables, but not types inherited 430 // from MetaspaceObj, because the latter does not have virtual functions. 431 // If the metadata type has a vtable, it cannot be shared in the read-only 432 // section of the CDS archive, because the vtable pointer is patched. 433 static inline void add_vtable(void** list, int* n, void* o, int count) { 434 guarantee((*n) < count, "vtable list too small"); 435 void* vtable = dereference_vptr(o); 436 assert(*(void**)(vtable) != NULL, "invalid vtable"); 437 list[(*n)++] = vtable; 438 } 439 440 void Universe::init_self_patching_vtbl_list(void** list, int count) { 441 int n = 0; 442 { InstanceKlass o; add_vtable(list, &n, &o, count); } 443 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 444 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 445 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 446 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 447 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 448 { Method o; add_vtable(list, &n, &o, count); } 449 { ConstantPool o; add_vtable(list, &n, &o, count); } 450 } 451 452 void Universe::initialize_basic_type_mirrors(TRAPS) { 453 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 454 _int_mirror = 455 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 456 _float_mirror = 457 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 458 _double_mirror = 459 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 460 _byte_mirror = 461 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 462 _bool_mirror = 463 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 464 _char_mirror = 465 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 466 _long_mirror = 467 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 468 _short_mirror = 469 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 470 _void_mirror = 471 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 472 473 _mirrors[T_INT] = _int_mirror; 474 _mirrors[T_FLOAT] = _float_mirror; 475 _mirrors[T_DOUBLE] = _double_mirror; 476 _mirrors[T_BYTE] = _byte_mirror; 477 _mirrors[T_BOOLEAN] = _bool_mirror; 478 _mirrors[T_CHAR] = _char_mirror; 479 _mirrors[T_LONG] = _long_mirror; 480 _mirrors[T_SHORT] = _short_mirror; 481 _mirrors[T_VOID] = _void_mirror; 482 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); 483 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); 484 } 485 486 void Universe::fixup_mirrors(TRAPS) { 487 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 488 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 489 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 490 // that the number of objects allocated at this point is very small. 491 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 492 HandleMark hm(THREAD); 493 // Cache the start of the static fields 494 InstanceMirrorKlass::init_offset_of_static_fields(); 495 496 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 497 int list_length = list->length(); 498 for (int i = 0; i < list_length; i++) { 499 Klass* k = list->at(i); 500 assert(k->is_klass(), "List should only hold classes"); 501 EXCEPTION_MARK; 502 KlassHandle kh(THREAD, k); 503 java_lang_Class::fixup_mirror(kh, CATCH); 504 } 505 delete java_lang_Class::fixup_mirror_list(); 506 java_lang_Class::set_fixup_mirror_list(NULL); 507 } 508 509 static bool has_run_finalizers_on_exit = false; 510 511 void Universe::run_finalizers_on_exit() { 512 if (has_run_finalizers_on_exit) return; 513 has_run_finalizers_on_exit = true; 514 515 // Called on VM exit. This ought to be run in a separate thread. 516 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 517 { 518 PRESERVE_EXCEPTION_MARK; 519 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 520 JavaValue result(T_VOID); 521 JavaCalls::call_static( 522 &result, 523 finalizer_klass, 524 vmSymbols::run_finalizers_on_exit_name(), 525 vmSymbols::void_method_signature(), 526 THREAD 527 ); 528 // Ignore any pending exceptions 529 CLEAR_PENDING_EXCEPTION; 530 } 531 } 532 533 534 // initialize_vtable could cause gc if 535 // 1) we specified true to initialize_vtable and 536 // 2) this ran after gc was enabled 537 // In case those ever change we use handles for oops 538 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 539 // init vtable of k and all subclasses 540 Klass* ko = k_h(); 541 klassVtable* vt = ko->vtable(); 542 if (vt) vt->initialize_vtable(false, CHECK); 543 if (ko->oop_is_instance()) { 544 InstanceKlass* ik = (InstanceKlass*)ko; 545 for (KlassHandle s_h(THREAD, ik->subklass()); 546 s_h() != NULL; 547 s_h = KlassHandle(THREAD, s_h()->next_sibling())) { 548 reinitialize_vtable_of(s_h, CHECK); 549 } 550 } 551 } 552 553 554 void initialize_itable_for_klass(Klass* k, TRAPS) { 555 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 556 } 557 558 559 void Universe::reinitialize_itables(TRAPS) { 560 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 561 562 } 563 564 565 bool Universe::on_page_boundary(void* addr) { 566 return ((uintptr_t) addr) % os::vm_page_size() == 0; 567 } 568 569 570 bool Universe::should_fill_in_stack_trace(Handle throwable) { 571 // never attempt to fill in the stack trace of preallocated errors that do not have 572 // backtrace. These errors are kept alive forever and may be "re-used" when all 573 // preallocated errors with backtrace have been consumed. Also need to avoid 574 // a potential loop which could happen if an out of memory occurs when attempting 575 // to allocate the backtrace. 576 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 577 (throwable() != Universe::_out_of_memory_error_metaspace) && 578 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 579 (throwable() != Universe::_out_of_memory_error_array_size) && 580 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) && 581 (throwable() != Universe::_out_of_memory_error_realloc_objects)); 582 } 583 584 585 oop Universe::gen_out_of_memory_error(oop default_err) { 586 // generate an out of memory error: 587 // - if there is a preallocated error with backtrace available then return it wth 588 // a filled in stack trace. 589 // - if there are no preallocated errors with backtrace available then return 590 // an error without backtrace. 591 int next; 592 if (_preallocated_out_of_memory_error_avail_count > 0) { 593 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 594 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 595 } else { 596 next = -1; 597 } 598 if (next < 0) { 599 // all preallocated errors have been used. 600 // return default 601 return default_err; 602 } else { 603 // get the error object at the slot and set set it to NULL so that the 604 // array isn't keeping it alive anymore. 605 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 606 assert(exc != NULL, "slot has been used already"); 607 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 608 609 // use the message from the default error 610 oop msg = java_lang_Throwable::message(default_err); 611 assert(msg != NULL, "no message"); 612 java_lang_Throwable::set_message(exc, msg); 613 614 // populate the stack trace and return it. 615 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 616 return exc; 617 } 618 } 619 620 intptr_t Universe::_non_oop_bits = 0; 621 622 void* Universe::non_oop_word() { 623 // Neither the high bits nor the low bits of this value is allowed 624 // to look like (respectively) the high or low bits of a real oop. 625 // 626 // High and low are CPU-specific notions, but low always includes 627 // the low-order bit. Since oops are always aligned at least mod 4, 628 // setting the low-order bit will ensure that the low half of the 629 // word will never look like that of a real oop. 630 // 631 // Using the OS-supplied non-memory-address word (usually 0 or -1) 632 // will take care of the high bits, however many there are. 633 634 if (_non_oop_bits == 0) { 635 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 636 } 637 638 return (void*)_non_oop_bits; 639 } 640 641 jint universe_init() { 642 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 643 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 644 "LogHeapWordSize is incorrect."); 645 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 646 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 647 "oop size is not not a multiple of HeapWord size"); 648 TraceTime timer("Genesis", TraceStartupTime); 649 JavaClasses::compute_hard_coded_offsets(); 650 651 jint status = Universe::initialize_heap(); 652 if (status != JNI_OK) { 653 return status; 654 } 655 656 Metaspace::global_initialize(); 657 658 // Create memory for metadata. Must be after initializing heap for 659 // DumpSharedSpaces. 660 ClassLoaderData::init_null_class_loader_data(); 661 662 // We have a heap so create the Method* caches before 663 // Metaspace::initialize_shared_spaces() tries to populate them. 664 Universe::_finalizer_register_cache = new LatestMethodCache(); 665 Universe::_loader_addClass_cache = new LatestMethodCache(); 666 Universe::_pd_implies_cache = new LatestMethodCache(); 667 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 668 669 if (UseSharedSpaces) { 670 // Read the data structures supporting the shared spaces (shared 671 // system dictionary, symbol table, etc.). After that, access to 672 // the file (other than the mapped regions) is no longer needed, and 673 // the file is closed. Closing the file does not affect the 674 // currently mapped regions. 675 MetaspaceShared::initialize_shared_spaces(); 676 StringTable::create_table(); 677 } else { 678 SymbolTable::create_table(); 679 StringTable::create_table(); 680 ClassLoader::create_package_info_table(); 681 682 if (DumpSharedSpaces) { 683 MetaspaceShared::prepare_for_dumping(); 684 } 685 } 686 687 return JNI_OK; 688 } 689 690 template <class Heap, class Policy> 691 jint Universe::create_heap() { 692 assert(_collectedHeap == NULL, "Heap already created"); 693 Policy* policy = new Policy(); 694 policy->initialize_all(); 695 _collectedHeap = new Heap(policy); 696 return _collectedHeap->initialize(); 697 } 698 699 // Choose the heap base address and oop encoding mode 700 // when compressed oops are used: 701 // Unscaled - Use 32-bits oops without encoding when 702 // NarrowOopHeapBaseMin + heap_size < 4Gb 703 // ZeroBased - Use zero based compressed oops with encoding when 704 // NarrowOopHeapBaseMin + heap_size < 32Gb 705 // HeapBased - Use compressed oops with heap base + encoding. 706 707 jint Universe::initialize_heap() { 708 jint status = JNI_ERR; 709 710 #if !INCLUDE_ALL_GCS 711 if (UseParallelGC) { 712 fatal("UseParallelGC not supported in this VM."); 713 } else if (UseG1GC) { 714 fatal("UseG1GC not supported in this VM."); 715 } else if (UseConcMarkSweepGC) { 716 fatal("UseConcMarkSweepGC not supported in this VM."); 717 #else 718 if (UseParallelGC) { 719 status = Universe::create_heap<ParallelScavengeHeap, GenerationSizer>(); 720 } else if (UseG1GC) { 721 status = Universe::create_heap<G1CollectedHeap, G1CollectorPolicyExt>(); 722 } else if (UseConcMarkSweepGC) { 723 status = Universe::create_heap<GenCollectedHeap, ConcurrentMarkSweepPolicy>(); 724 #endif 725 } else if (UseSerialGC) { 726 status = Universe::create_heap<GenCollectedHeap, MarkSweepPolicy>(); 727 } else { 728 ShouldNotReachHere(); 729 } 730 731 if (status != JNI_OK) { 732 return status; 733 } 734 735 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 736 737 #ifdef _LP64 738 if (UseCompressedOops) { 739 // Subtract a page because something can get allocated at heap base. 740 // This also makes implicit null checking work, because the 741 // memory+1 page below heap_base needs to cause a signal. 742 // See needs_explicit_null_check. 743 // Only set the heap base for compressed oops because it indicates 744 // compressed oops for pstack code. 745 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 746 // Didn't reserve heap below 4Gb. Must shift. 747 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 748 } 749 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 750 // Did reserve heap below 32Gb. Can use base == 0; 751 Universe::set_narrow_oop_base(0); 752 } 753 754 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 755 756 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 757 Universe::print_compressed_oops_mode(tty); 758 } 759 760 // Tell tests in which mode we run. 761 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 762 narrow_oop_mode_to_string(narrow_oop_mode()), 763 false)); 764 } 765 // Universe::narrow_oop_base() is one page below the heap. 766 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 767 os::vm_page_size()) || 768 Universe::narrow_oop_base() == NULL, "invalid value"); 769 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 770 Universe::narrow_oop_shift() == 0, "invalid value"); 771 #endif 772 773 // We will never reach the CATCH below since Exceptions::_throw will cause 774 // the VM to exit if an exception is thrown during initialization 775 776 if (UseTLAB) { 777 assert(Universe::heap()->supports_tlab_allocation(), 778 "Should support thread-local allocation buffers"); 779 ThreadLocalAllocBuffer::startup_initialization(); 780 } 781 return JNI_OK; 782 } 783 784 void Universe::print_compressed_oops_mode(outputStream* st) { 785 st->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 786 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 787 788 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 789 790 if (Universe::narrow_oop_base() != 0) { 791 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 792 } 793 794 if (Universe::narrow_oop_shift() != 0) { 795 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 796 } 797 798 if (!Universe::narrow_oop_use_implicit_null_checks()) { 799 st->print(", no protected page in front of the heap"); 800 } 801 st->cr(); 802 } 803 804 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 805 806 assert(alignment <= Arguments::conservative_max_heap_alignment(), 807 err_msg("actual alignment "SIZE_FORMAT" must be within maximum heap alignment "SIZE_FORMAT, 808 alignment, Arguments::conservative_max_heap_alignment())); 809 810 size_t total_reserved = align_size_up(heap_size, alignment); 811 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 812 "heap size is too big for compressed oops"); 813 814 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size()); 815 assert(!UseLargePages 816 || UseParallelGC 817 || use_large_pages, "Wrong alignment to use large pages"); 818 819 // Now create the space. 820 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages); 821 822 if (total_rs.is_reserved()) { 823 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 824 "must be exactly of required size and alignment"); 825 // We are good. 826 827 if (UseCompressedOops) { 828 // Universe::initialize_heap() will reset this to NULL if unscaled 829 // or zero-based narrow oops are actually used. 830 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 831 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 832 } 833 834 return total_rs; 835 } 836 837 vm_exit_during_initialization( 838 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 839 total_reserved/K)); 840 841 // satisfy compiler 842 ShouldNotReachHere(); 843 return ReservedHeapSpace(0, 0, false); 844 } 845 846 847 // It's the caller's responsibility to ensure glitch-freedom 848 // (if required). 849 void Universe::update_heap_info_at_gc() { 850 _heap_capacity_at_last_gc = heap()->capacity(); 851 _heap_used_at_last_gc = heap()->used(); 852 } 853 854 855 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 856 switch (mode) { 857 case UnscaledNarrowOop: 858 return "32-bit"; 859 case ZeroBasedNarrowOop: 860 return "Zero based"; 861 case DisjointBaseNarrowOop: 862 return "Non-zero disjoint base"; 863 case HeapBasedNarrowOop: 864 return "Non-zero based"; 865 } 866 867 ShouldNotReachHere(); 868 return ""; 869 } 870 871 872 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 873 if (narrow_oop_base_disjoint()) { 874 return DisjointBaseNarrowOop; 875 } 876 877 if (narrow_oop_base() != 0) { 878 return HeapBasedNarrowOop; 879 } 880 881 if (narrow_oop_shift() != 0) { 882 return ZeroBasedNarrowOop; 883 } 884 885 return UnscaledNarrowOop; 886 } 887 888 889 void universe2_init() { 890 EXCEPTION_MARK; 891 Universe::genesis(CATCH); 892 } 893 894 895 bool universe_post_init() { 896 assert(!is_init_completed(), "Error: initialization not yet completed!"); 897 Universe::_fully_initialized = true; 898 EXCEPTION_MARK; 899 { ResourceMark rm; 900 Interpreter::initialize(); // needed for interpreter entry points 901 if (!UseSharedSpaces) { 902 HandleMark hm(THREAD); 903 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 904 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 905 Universe::reinitialize_itables(CHECK_false); 906 } 907 } 908 909 HandleMark hm(THREAD); 910 Klass* k; 911 instanceKlassHandle k_h; 912 // Setup preallocated empty java.lang.Class array 913 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 914 915 // Setup preallocated OutOfMemoryError errors 916 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 917 k_h = instanceKlassHandle(THREAD, k); 918 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 919 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); 920 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); 921 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 922 Universe::_out_of_memory_error_gc_overhead_limit = 923 k_h->allocate_instance(CHECK_false); 924 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false); 925 926 // Setup preallocated NullPointerException 927 // (this is currently used for a cheap & dirty solution in compiler exception handling) 928 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 929 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 930 // Setup preallocated ArithmeticException 931 // (this is currently used for a cheap & dirty solution in compiler exception handling) 932 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 933 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 934 // Virtual Machine Error for when we get into a situation we can't resolve 935 k = SystemDictionary::resolve_or_fail( 936 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 937 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 938 if (!linked) { 939 tty->print_cr("Unable to link/verify VirtualMachineError class"); 940 return false; // initialization failed 941 } 942 Universe::_virtual_machine_error_instance = 943 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 944 945 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 946 947 if (!DumpSharedSpaces) { 948 // These are the only Java fields that are currently set during shared space dumping. 949 // We prefer to not handle this generally, so we always reinitialize these detail messages. 950 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 951 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 952 953 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 954 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 955 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 956 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 957 958 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 959 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 960 961 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 962 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 963 964 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 965 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 966 967 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 968 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 969 970 // Setup the array of errors that have preallocated backtrace 971 k = Universe::_out_of_memory_error_java_heap->klass(); 972 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 973 k_h = instanceKlassHandle(THREAD, k); 974 975 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 976 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 977 for (int i=0; i<len; i++) { 978 oop err = k_h->allocate_instance(CHECK_false); 979 Handle err_h = Handle(THREAD, err); 980 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 981 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 982 } 983 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 984 } 985 986 987 // Setup static method for registering finalizers 988 // The finalizer klass must be linked before looking up the method, in 989 // case it needs to get rewritten. 990 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); 991 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( 992 vmSymbols::register_method_name(), 993 vmSymbols::register_method_signature()); 994 if (m == NULL || !m->is_static()) { 995 tty->print_cr("Unable to link/verify Finalizer.register method"); 996 return false; // initialization failed (cannot throw exception yet) 997 } 998 Universe::_finalizer_register_cache->init( 999 SystemDictionary::Finalizer_klass(), m); 1000 1001 InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->link_class(CHECK_false); 1002 m = InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->find_method( 1003 vmSymbols::throwIllegalAccessError_name(), 1004 vmSymbols::void_method_signature()); 1005 if (m != NULL && !m->is_static()) { 1006 // Note null is okay; this method is used in itables, and if it is null, 1007 // then AbstractMethodError is thrown instead. 1008 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method"); 1009 return false; // initialization failed (cannot throw exception yet) 1010 } 1011 Universe::_throw_illegal_access_error_cache->init( 1012 SystemDictionary::misc_Unsafe_klass(), m); 1013 1014 // Setup method for registering loaded classes in class loader vector 1015 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); 1016 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1017 if (m == NULL || m->is_static()) { 1018 tty->print_cr("Unable to link/verify ClassLoader.addClass method"); 1019 return false; // initialization failed (cannot throw exception yet) 1020 } 1021 Universe::_loader_addClass_cache->init( 1022 SystemDictionary::ClassLoader_klass(), m); 1023 1024 // Setup method for checking protection domain 1025 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false); 1026 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())-> 1027 find_method(vmSymbols::impliesCreateAccessControlContext_name(), 1028 vmSymbols::void_boolean_signature()); 1029 // Allow NULL which should only happen with bootstrapping. 1030 if (m != NULL) { 1031 if (m->is_static()) { 1032 // NoSuchMethodException doesn't actually work because it tries to run the 1033 // <init> function before java_lang_Class is linked. Print error and exit. 1034 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); 1035 return false; // initialization failed 1036 } 1037 Universe::_pd_implies_cache->init( 1038 SystemDictionary::ProtectionDomain_klass(), m); 1039 } 1040 1041 // This needs to be done before the first scavenge/gc, since 1042 // it's an input to soft ref clearing policy. 1043 { 1044 MutexLocker x(Heap_lock); 1045 Universe::update_heap_info_at_gc(); 1046 } 1047 1048 // ("weak") refs processing infrastructure initialization 1049 Universe::heap()->post_initialize(); 1050 1051 // Initialize performance counters for metaspaces 1052 MetaspaceCounters::initialize_performance_counters(); 1053 CompressedClassSpaceCounters::initialize_performance_counters(); 1054 1055 MemoryService::add_metaspace_memory_pools(); 1056 1057 MemoryService::set_universe_heap(Universe::heap()); 1058 #if INCLUDE_CDS 1059 SharedClassUtil::initialize(CHECK_false); 1060 #endif 1061 return true; 1062 } 1063 1064 1065 void Universe::compute_base_vtable_size() { 1066 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1067 } 1068 1069 1070 void Universe::print() { 1071 print_on(gclog_or_tty); 1072 } 1073 1074 void Universe::print_on(outputStream* st, bool extended) { 1075 st->print_cr("Heap"); 1076 if (!extended) { 1077 heap()->print_on(st); 1078 } else { 1079 heap()->print_extended_on(st); 1080 } 1081 } 1082 1083 void Universe::print_heap_at_SIGBREAK() { 1084 if (PrintHeapAtSIGBREAK) { 1085 MutexLocker hl(Heap_lock); 1086 print_on(tty); 1087 tty->cr(); 1088 tty->flush(); 1089 } 1090 } 1091 1092 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1093 st->print_cr("{Heap before GC invocations=%u (full %u):", 1094 heap()->total_collections(), 1095 heap()->total_full_collections()); 1096 if (!PrintHeapAtGCExtended || ignore_extended) { 1097 heap()->print_on(st); 1098 } else { 1099 heap()->print_extended_on(st); 1100 } 1101 } 1102 1103 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1104 st->print_cr("Heap after GC invocations=%u (full %u):", 1105 heap()->total_collections(), 1106 heap()->total_full_collections()); 1107 if (!PrintHeapAtGCExtended || ignore_extended) { 1108 heap()->print_on(st); 1109 } else { 1110 heap()->print_extended_on(st); 1111 } 1112 st->print_cr("}"); 1113 } 1114 1115 void Universe::verify(VerifyOption option, const char* prefix, bool silent) { 1116 // The use of _verify_in_progress is a temporary work around for 1117 // 6320749. Don't bother with a creating a class to set and clear 1118 // it since it is only used in this method and the control flow is 1119 // straight forward. 1120 _verify_in_progress = true; 1121 1122 COMPILER2_PRESENT( 1123 assert(!DerivedPointerTable::is_active(), 1124 "DPT should not be active during verification " 1125 "(of thread stacks below)"); 1126 ) 1127 1128 ResourceMark rm; 1129 HandleMark hm; // Handles created during verification can be zapped 1130 _verify_count++; 1131 1132 if (!silent) gclog_or_tty->print("%s", prefix); 1133 if (!silent) gclog_or_tty->print("[Verifying "); 1134 if (!silent) gclog_or_tty->print("threads "); 1135 Threads::verify(); 1136 if (!silent) gclog_or_tty->print("heap "); 1137 heap()->verify(silent, option); 1138 if (!silent) gclog_or_tty->print("syms "); 1139 SymbolTable::verify(); 1140 if (!silent) gclog_or_tty->print("strs "); 1141 StringTable::verify(); 1142 { 1143 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1144 if (!silent) gclog_or_tty->print("zone "); 1145 CodeCache::verify(); 1146 } 1147 if (!silent) gclog_or_tty->print("dict "); 1148 SystemDictionary::verify(); 1149 #ifndef PRODUCT 1150 if (!silent) gclog_or_tty->print("cldg "); 1151 ClassLoaderDataGraph::verify(); 1152 #endif 1153 if (!silent) gclog_or_tty->print("metaspace chunks "); 1154 MetaspaceAux::verify_free_chunks(); 1155 if (!silent) gclog_or_tty->print("hand "); 1156 JNIHandles::verify(); 1157 if (!silent) gclog_or_tty->print("C-heap "); 1158 os::check_heap(); 1159 if (!silent) gclog_or_tty->print("code cache "); 1160 CodeCache::verify_oops(); 1161 if (!silent) gclog_or_tty->print_cr("]"); 1162 1163 _verify_in_progress = false; 1164 } 1165 1166 // Oop verification (see MacroAssembler::verify_oop) 1167 1168 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; 1169 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; 1170 1171 1172 #ifndef PRODUCT 1173 1174 static void calculate_verify_data(uintptr_t verify_data[2], 1175 HeapWord* low_boundary, 1176 HeapWord* high_boundary) { 1177 assert(low_boundary < high_boundary, "bad interval"); 1178 1179 // decide which low-order bits we require to be clear: 1180 size_t alignSize = MinObjAlignmentInBytes; 1181 size_t min_object_size = CollectedHeap::min_fill_size(); 1182 1183 // make an inclusive limit: 1184 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1185 uintptr_t min = (uintptr_t)low_boundary; 1186 assert(min < max, "bad interval"); 1187 uintptr_t diff = max ^ min; 1188 1189 // throw away enough low-order bits to make the diff vanish 1190 uintptr_t mask = (uintptr_t)(-1); 1191 while ((mask & diff) != 0) 1192 mask <<= 1; 1193 uintptr_t bits = (min & mask); 1194 assert(bits == (max & mask), "correct mask"); 1195 // check an intermediate value between min and max, just to make sure: 1196 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1197 1198 // require address alignment, too: 1199 mask |= (alignSize - 1); 1200 1201 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { 1202 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); 1203 } 1204 verify_data[0] = mask; 1205 verify_data[1] = bits; 1206 } 1207 1208 // Oop verification (see MacroAssembler::verify_oop) 1209 1210 uintptr_t Universe::verify_oop_mask() { 1211 MemRegion m = heap()->reserved_region(); 1212 calculate_verify_data(_verify_oop_data, 1213 m.start(), 1214 m.end()); 1215 return _verify_oop_data[0]; 1216 } 1217 1218 1219 1220 uintptr_t Universe::verify_oop_bits() { 1221 verify_oop_mask(); 1222 return _verify_oop_data[1]; 1223 } 1224 1225 uintptr_t Universe::verify_mark_mask() { 1226 return markOopDesc::lock_mask_in_place; 1227 } 1228 1229 uintptr_t Universe::verify_mark_bits() { 1230 intptr_t mask = verify_mark_mask(); 1231 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1232 assert((bits & ~mask) == 0, "no stray header bits"); 1233 return bits; 1234 } 1235 #endif // PRODUCT 1236 1237 1238 void Universe::compute_verify_oop_data() { 1239 verify_oop_mask(); 1240 verify_oop_bits(); 1241 verify_mark_mask(); 1242 verify_mark_bits(); 1243 } 1244 1245 1246 void LatestMethodCache::init(Klass* k, Method* m) { 1247 if (!UseSharedSpaces) { 1248 _klass = k; 1249 } 1250 #ifndef PRODUCT 1251 else { 1252 // sharing initilization should have already set up _klass 1253 assert(_klass != NULL, "just checking"); 1254 } 1255 #endif 1256 1257 _method_idnum = m->method_idnum(); 1258 assert(_method_idnum >= 0, "sanity check"); 1259 } 1260 1261 1262 Method* LatestMethodCache::get_method() { 1263 if (klass() == NULL) return NULL; 1264 InstanceKlass* ik = InstanceKlass::cast(klass()); 1265 Method* m = ik->method_with_idnum(method_idnum()); 1266 assert(m != NULL, "sanity check"); 1267 return m; 1268 } 1269 1270 1271 #ifdef ASSERT 1272 // Release dummy object(s) at bottom of heap 1273 bool Universe::release_fullgc_alot_dummy() { 1274 MutexLocker ml(FullGCALot_lock); 1275 if (_fullgc_alot_dummy_array != NULL) { 1276 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1277 // No more dummies to release, release entire array instead 1278 _fullgc_alot_dummy_array = NULL; 1279 return false; 1280 } 1281 if (!UseConcMarkSweepGC) { 1282 // Release dummy at bottom of old generation 1283 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1284 } 1285 // Release dummy at bottom of permanent generation 1286 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1287 } 1288 return true; 1289 } 1290 1291 #endif // ASSERT