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/commandLineFlagConstraintList.hpp" 60 #include "runtime/deoptimization.hpp" 61 #include "runtime/fprofiler.hpp" 62 #include "runtime/handles.inline.hpp" 63 #include "runtime/init.hpp" 64 #include "runtime/java.hpp" 65 #include "runtime/javaCalls.hpp" 66 #include "runtime/sharedRuntime.hpp" 67 #include "runtime/synchronizer.hpp" 68 #include "runtime/thread.inline.hpp" 69 #include "runtime/timer.hpp" 70 #include "runtime/vm_operations.hpp" 71 #include "services/memoryService.hpp" 72 #include "utilities/copy.hpp" 73 #include "utilities/events.hpp" 74 #include "utilities/hashtable.inline.hpp" 75 #include "utilities/macros.hpp" 76 #include "utilities/preserveException.hpp" 77 #if INCLUDE_ALL_GCS 78 #include "gc/shenandoah/shenandoahHeap.hpp" 79 #include "gc/shenandoah/shenandoahCollectorPolicy.hpp" 80 #include "gc/cms/cmsCollectorPolicy.hpp" 81 #include "gc/g1/g1CollectedHeap.inline.hpp" 82 #include "gc/g1/g1CollectorPolicy.hpp" 83 #include "gc/parallel/parallelScavengeHeap.hpp" 84 #include "gc/shared/adaptiveSizePolicy.hpp" 85 #endif // INCLUDE_ALL_GCS 86 #if INCLUDE_CDS 87 #include "classfile/sharedClassUtil.hpp" 88 #endif 89 90 // Known objects 91 Klass* Universe::_boolArrayKlassObj = NULL; 92 Klass* Universe::_byteArrayKlassObj = NULL; 93 Klass* Universe::_charArrayKlassObj = NULL; 94 Klass* Universe::_intArrayKlassObj = NULL; 95 Klass* Universe::_shortArrayKlassObj = NULL; 96 Klass* Universe::_longArrayKlassObj = NULL; 97 Klass* Universe::_singleArrayKlassObj = NULL; 98 Klass* Universe::_doubleArrayKlassObj = NULL; 99 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 100 Klass* Universe::_objectArrayKlassObj = NULL; 101 oop Universe::_int_mirror = NULL; 102 oop Universe::_float_mirror = NULL; 103 oop Universe::_double_mirror = NULL; 104 oop Universe::_byte_mirror = NULL; 105 oop Universe::_bool_mirror = NULL; 106 oop Universe::_char_mirror = NULL; 107 oop Universe::_long_mirror = NULL; 108 oop Universe::_short_mirror = NULL; 109 oop Universe::_void_mirror = NULL; 110 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 111 oop Universe::_main_thread_group = NULL; 112 oop Universe::_system_thread_group = NULL; 113 objArrayOop Universe::_the_empty_class_klass_array = NULL; 114 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 115 oop Universe::_the_null_string = NULL; 116 oop Universe::_the_min_jint_string = NULL; 117 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 118 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 119 LatestMethodCache* Universe::_pd_implies_cache = NULL; 120 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 121 oop Universe::_out_of_memory_error_java_heap = NULL; 122 oop Universe::_out_of_memory_error_metaspace = NULL; 123 oop Universe::_out_of_memory_error_class_metaspace = NULL; 124 oop Universe::_out_of_memory_error_array_size = NULL; 125 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 126 oop Universe::_out_of_memory_error_realloc_objects = NULL; 127 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 128 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 129 bool Universe::_verify_in_progress = false; 130 oop Universe::_null_ptr_exception_instance = NULL; 131 oop Universe::_arithmetic_exception_instance = NULL; 132 oop Universe::_virtual_machine_error_instance = NULL; 133 oop Universe::_vm_exception = NULL; 134 oop Universe::_allocation_context_notification_obj = NULL; 135 136 Array<int>* Universe::_the_empty_int_array = NULL; 137 Array<u2>* Universe::_the_empty_short_array = NULL; 138 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 139 Array<Method*>* Universe::_the_empty_method_array = NULL; 140 141 // These variables are guarded by FullGCALot_lock. 142 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 143 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 144 145 // Heap 146 int Universe::_verify_count = 0; 147 148 int Universe::_base_vtable_size = 0; 149 bool Universe::_bootstrapping = false; 150 bool Universe::_fully_initialized = false; 151 152 size_t Universe::_heap_capacity_at_last_gc; 153 size_t Universe::_heap_used_at_last_gc = 0; 154 155 CollectedHeap* Universe::_collectedHeap = NULL; 156 157 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 158 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 159 address Universe::_narrow_ptrs_base; 160 161 void Universe::basic_type_classes_do(void f(Klass*)) { 162 f(boolArrayKlassObj()); 163 f(byteArrayKlassObj()); 164 f(charArrayKlassObj()); 165 f(intArrayKlassObj()); 166 f(shortArrayKlassObj()); 167 f(longArrayKlassObj()); 168 f(singleArrayKlassObj()); 169 f(doubleArrayKlassObj()); 170 } 171 172 void Universe::oops_do(OopClosure* f, bool do_all) { 173 174 f->do_oop((oop*) &_int_mirror); 175 f->do_oop((oop*) &_float_mirror); 176 f->do_oop((oop*) &_double_mirror); 177 f->do_oop((oop*) &_byte_mirror); 178 f->do_oop((oop*) &_bool_mirror); 179 f->do_oop((oop*) &_char_mirror); 180 f->do_oop((oop*) &_long_mirror); 181 f->do_oop((oop*) &_short_mirror); 182 f->do_oop((oop*) &_void_mirror); 183 184 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 185 f->do_oop((oop*) &_mirrors[i]); 186 } 187 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 188 189 f->do_oop((oop*)&_the_empty_class_klass_array); 190 f->do_oop((oop*)&_the_null_string); 191 f->do_oop((oop*)&_the_min_jint_string); 192 f->do_oop((oop*)&_out_of_memory_error_java_heap); 193 f->do_oop((oop*)&_out_of_memory_error_metaspace); 194 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 195 f->do_oop((oop*)&_out_of_memory_error_array_size); 196 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 197 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 198 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 199 f->do_oop((oop*)&_null_ptr_exception_instance); 200 f->do_oop((oop*)&_arithmetic_exception_instance); 201 f->do_oop((oop*)&_virtual_machine_error_instance); 202 f->do_oop((oop*)&_main_thread_group); 203 f->do_oop((oop*)&_system_thread_group); 204 f->do_oop((oop*)&_vm_exception); 205 f->do_oop((oop*)&_allocation_context_notification_obj); 206 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 207 } 208 209 // Serialize metadata in and out of CDS archive, not oops. 210 void Universe::serialize(SerializeClosure* f, bool do_all) { 211 212 f->do_ptr((void**)&_boolArrayKlassObj); 213 f->do_ptr((void**)&_byteArrayKlassObj); 214 f->do_ptr((void**)&_charArrayKlassObj); 215 f->do_ptr((void**)&_intArrayKlassObj); 216 f->do_ptr((void**)&_shortArrayKlassObj); 217 f->do_ptr((void**)&_longArrayKlassObj); 218 f->do_ptr((void**)&_singleArrayKlassObj); 219 f->do_ptr((void**)&_doubleArrayKlassObj); 220 f->do_ptr((void**)&_objectArrayKlassObj); 221 222 { 223 for (int i = 0; i < T_VOID+1; i++) { 224 if (_typeArrayKlassObjs[i] != NULL) { 225 assert(i >= T_BOOLEAN, "checking"); 226 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 227 } else if (do_all) { 228 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 229 } 230 } 231 } 232 233 f->do_ptr((void**)&_the_array_interfaces_array); 234 f->do_ptr((void**)&_the_empty_int_array); 235 f->do_ptr((void**)&_the_empty_short_array); 236 f->do_ptr((void**)&_the_empty_method_array); 237 f->do_ptr((void**)&_the_empty_klass_array); 238 _finalizer_register_cache->serialize(f); 239 _loader_addClass_cache->serialize(f); 240 _pd_implies_cache->serialize(f); 241 _throw_illegal_access_error_cache->serialize(f); 242 } 243 244 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 245 if (size < alignment || size % alignment != 0) { 246 vm_exit_during_initialization( 247 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 248 } 249 } 250 251 void initialize_basic_type_klass(Klass* k, TRAPS) { 252 Klass* ok = SystemDictionary::Object_klass(); 253 if (UseSharedSpaces) { 254 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 255 assert(k->super() == ok, "u3"); 256 k->restore_unshareable_info(loader_data, Handle(), CHECK); 257 } else { 258 k->initialize_supers(ok, CHECK); 259 } 260 k->append_to_sibling_list(); 261 } 262 263 void Universe::genesis(TRAPS) { 264 ResourceMark rm; 265 266 { FlagSetting fs(_bootstrapping, true); 267 268 { MutexLocker mc(Compile_lock); 269 270 // determine base vtable size; without that we cannot create the array klasses 271 compute_base_vtable_size(); 272 273 if (!UseSharedSpaces) { 274 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 275 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 276 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 277 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 278 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 279 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 280 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 281 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 282 283 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 284 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 285 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 286 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 287 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 288 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 289 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 290 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 291 292 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 293 294 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 295 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 296 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 297 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 298 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 299 } 300 } 301 302 vmSymbols::initialize(CHECK); 303 304 SystemDictionary::initialize(CHECK); 305 306 Klass* ok = SystemDictionary::Object_klass(); 307 308 _the_null_string = StringTable::intern("null", CHECK); 309 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 310 311 if (UseSharedSpaces) { 312 // Verify shared interfaces array. 313 assert(_the_array_interfaces_array->at(0) == 314 SystemDictionary::Cloneable_klass(), "u3"); 315 assert(_the_array_interfaces_array->at(1) == 316 SystemDictionary::Serializable_klass(), "u3"); 317 MetaspaceShared::fixup_shared_string_regions(); 318 } else { 319 // Set up shared interfaces array. (Do this before supers are set up.) 320 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 321 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 322 } 323 324 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 325 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 326 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 327 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 328 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 329 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 330 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 331 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 332 } // end of core bootstrapping 333 334 // Maybe this could be lifted up now that object array can be initialized 335 // during the bootstrapping. 336 337 // OLD 338 // Initialize _objectArrayKlass after core bootstraping to make 339 // sure the super class is set up properly for _objectArrayKlass. 340 // --- 341 // NEW 342 // Since some of the old system object arrays have been converted to 343 // ordinary object arrays, _objectArrayKlass will be loaded when 344 // SystemDictionary::initialize(CHECK); is run. See the extra check 345 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 346 _objectArrayKlassObj = InstanceKlass:: 347 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 348 // OLD 349 // Add the class to the class hierarchy manually to make sure that 350 // its vtable is initialized after core bootstrapping is completed. 351 // --- 352 // New 353 // Have already been initialized. 354 _objectArrayKlassObj->append_to_sibling_list(); 355 356 // Compute is_jdk version flags. 357 // Only 1.3 or later has the java.lang.Shutdown class. 358 // Only 1.4 or later has the java.lang.CharSequence interface. 359 // Only 1.5 or later has the java.lang.management.MemoryUsage class. 360 if (JDK_Version::is_partially_initialized()) { 361 uint8_t jdk_version; 362 Klass* k = SystemDictionary::resolve_or_null( 363 vmSymbols::java_lang_management_MemoryUsage(), THREAD); 364 CLEAR_PENDING_EXCEPTION; // ignore exceptions 365 if (k == NULL) { 366 k = SystemDictionary::resolve_or_null( 367 vmSymbols::java_lang_CharSequence(), THREAD); 368 CLEAR_PENDING_EXCEPTION; // ignore exceptions 369 if (k == NULL) { 370 k = SystemDictionary::resolve_or_null( 371 vmSymbols::java_lang_Shutdown(), THREAD); 372 CLEAR_PENDING_EXCEPTION; // ignore exceptions 373 if (k == NULL) { 374 jdk_version = 2; 375 } else { 376 jdk_version = 3; 377 } 378 } else { 379 jdk_version = 4; 380 } 381 } else { 382 jdk_version = 5; 383 } 384 JDK_Version::fully_initialize(jdk_version); 385 } 386 387 #ifdef ASSERT 388 if (FullGCALot) { 389 // Allocate an array of dummy objects. 390 // We'd like these to be at the bottom of the old generation, 391 // so that when we free one and then collect, 392 // (almost) the whole heap moves 393 // and we find out if we actually update all the oops correctly. 394 // But we can't allocate directly in the old generation, 395 // so we allocate wherever, and hope that the first collection 396 // moves these objects to the bottom of the old generation. 397 // We can allocate directly in the permanent generation, so we do. 398 int size; 399 if (UseConcMarkSweepGC) { 400 warning("Using +FullGCALot with concurrent mark sweep gc " 401 "will not force all objects to relocate"); 402 size = FullGCALotDummies; 403 } else { 404 size = FullGCALotDummies * 2; 405 } 406 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 407 objArrayHandle dummy_array(THREAD, naked_array); 408 int i = 0; 409 while (i < size) { 410 // Allocate dummy in old generation 411 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); 412 dummy_array->obj_at_put(i++, dummy); 413 } 414 { 415 // Only modify the global variable inside the mutex. 416 // If we had a race to here, the other dummy_array instances 417 // and their elements just get dropped on the floor, which is fine. 418 MutexLocker ml(FullGCALot_lock); 419 if (_fullgc_alot_dummy_array == NULL) { 420 _fullgc_alot_dummy_array = dummy_array(); 421 } 422 } 423 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 424 } 425 #endif 426 427 // Initialize dependency array for null class loader 428 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 429 430 } 431 432 // CDS support for patching vtables in metadata in the shared archive. 433 // All types inherited from Metadata have vtables, but not types inherited 434 // from MetaspaceObj, because the latter does not have virtual functions. 435 // If the metadata type has a vtable, it cannot be shared in the read-only 436 // section of the CDS archive, because the vtable pointer is patched. 437 static inline void add_vtable(void** list, int* n, void* o, int count) { 438 guarantee((*n) < count, "vtable list too small"); 439 void* vtable = dereference_vptr(o); 440 assert(*(void**)(vtable) != NULL, "invalid vtable"); 441 list[(*n)++] = vtable; 442 } 443 444 void Universe::init_self_patching_vtbl_list(void** list, int count) { 445 int n = 0; 446 { InstanceKlass o; add_vtable(list, &n, &o, count); } 447 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 448 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 449 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 450 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 451 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 452 { Method o; add_vtable(list, &n, &o, count); } 453 { ConstantPool o; add_vtable(list, &n, &o, count); } 454 } 455 456 void Universe::initialize_basic_type_mirrors(TRAPS) { 457 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 458 _int_mirror = 459 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 460 _float_mirror = 461 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 462 _double_mirror = 463 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 464 _byte_mirror = 465 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 466 _bool_mirror = 467 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 468 _char_mirror = 469 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 470 _long_mirror = 471 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 472 _short_mirror = 473 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 474 _void_mirror = 475 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 476 477 _mirrors[T_INT] = _int_mirror; 478 _mirrors[T_FLOAT] = _float_mirror; 479 _mirrors[T_DOUBLE] = _double_mirror; 480 _mirrors[T_BYTE] = _byte_mirror; 481 _mirrors[T_BOOLEAN] = _bool_mirror; 482 _mirrors[T_CHAR] = _char_mirror; 483 _mirrors[T_LONG] = _long_mirror; 484 _mirrors[T_SHORT] = _short_mirror; 485 _mirrors[T_VOID] = _void_mirror; 486 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); 487 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); 488 } 489 490 void Universe::fixup_mirrors(TRAPS) { 491 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 492 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 493 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 494 // that the number of objects allocated at this point is very small. 495 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 496 HandleMark hm(THREAD); 497 // Cache the start of the static fields 498 InstanceMirrorKlass::init_offset_of_static_fields(); 499 500 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 501 int list_length = list->length(); 502 for (int i = 0; i < list_length; i++) { 503 Klass* k = list->at(i); 504 assert(k->is_klass(), "List should only hold classes"); 505 EXCEPTION_MARK; 506 KlassHandle kh(THREAD, k); 507 java_lang_Class::fixup_mirror(kh, CATCH); 508 } 509 delete java_lang_Class::fixup_mirror_list(); 510 java_lang_Class::set_fixup_mirror_list(NULL); 511 } 512 513 static bool has_run_finalizers_on_exit = false; 514 515 void Universe::run_finalizers_on_exit() { 516 if (has_run_finalizers_on_exit) return; 517 has_run_finalizers_on_exit = true; 518 519 // Called on VM exit. This ought to be run in a separate thread. 520 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 521 { 522 PRESERVE_EXCEPTION_MARK; 523 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 524 JavaValue result(T_VOID); 525 JavaCalls::call_static( 526 &result, 527 finalizer_klass, 528 vmSymbols::run_finalizers_on_exit_name(), 529 vmSymbols::void_method_signature(), 530 THREAD 531 ); 532 // Ignore any pending exceptions 533 CLEAR_PENDING_EXCEPTION; 534 } 535 } 536 537 538 // initialize_vtable could cause gc if 539 // 1) we specified true to initialize_vtable and 540 // 2) this ran after gc was enabled 541 // In case those ever change we use handles for oops 542 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 543 // init vtable of k and all subclasses 544 Klass* ko = k_h(); 545 klassVtable* vt = ko->vtable(); 546 if (vt) vt->initialize_vtable(false, CHECK); 547 if (ko->oop_is_instance()) { 548 InstanceKlass* ik = (InstanceKlass*)ko; 549 for (KlassHandle s_h(THREAD, ik->subklass()); 550 s_h() != NULL; 551 s_h = KlassHandle(THREAD, s_h()->next_sibling())) { 552 reinitialize_vtable_of(s_h, CHECK); 553 } 554 } 555 } 556 557 558 void initialize_itable_for_klass(Klass* k, TRAPS) { 559 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 560 } 561 562 563 void Universe::reinitialize_itables(TRAPS) { 564 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 565 566 } 567 568 569 bool Universe::on_page_boundary(void* addr) { 570 return ((uintptr_t) addr) % os::vm_page_size() == 0; 571 } 572 573 574 bool Universe::should_fill_in_stack_trace(Handle throwable) { 575 // never attempt to fill in the stack trace of preallocated errors that do not have 576 // backtrace. These errors are kept alive forever and may be "re-used" when all 577 // preallocated errors with backtrace have been consumed. Also need to avoid 578 // a potential loop which could happen if an out of memory occurs when attempting 579 // to allocate the backtrace. 580 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 581 (throwable() != Universe::_out_of_memory_error_metaspace) && 582 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 583 (throwable() != Universe::_out_of_memory_error_array_size) && 584 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) && 585 (throwable() != Universe::_out_of_memory_error_realloc_objects)); 586 } 587 588 589 oop Universe::gen_out_of_memory_error(oop default_err) { 590 // generate an out of memory error: 591 // - if there is a preallocated error with backtrace available then return it wth 592 // a filled in stack trace. 593 // - if there are no preallocated errors with backtrace available then return 594 // an error without backtrace. 595 int next; 596 if (_preallocated_out_of_memory_error_avail_count > 0) { 597 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 598 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 599 } else { 600 next = -1; 601 } 602 if (next < 0) { 603 // all preallocated errors have been used. 604 // return default 605 return default_err; 606 } else { 607 // get the error object at the slot and set set it to NULL so that the 608 // array isn't keeping it alive anymore. 609 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 610 assert(exc != NULL, "slot has been used already"); 611 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 612 613 // use the message from the default error 614 oop msg = java_lang_Throwable::message(default_err); 615 assert(msg != NULL, "no message"); 616 java_lang_Throwable::set_message(exc, msg); 617 618 // populate the stack trace and return it. 619 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 620 return exc; 621 } 622 } 623 624 intptr_t Universe::_non_oop_bits = 0; 625 626 void* Universe::non_oop_word() { 627 // Neither the high bits nor the low bits of this value is allowed 628 // to look like (respectively) the high or low bits of a real oop. 629 // 630 // High and low are CPU-specific notions, but low always includes 631 // the low-order bit. Since oops are always aligned at least mod 4, 632 // setting the low-order bit will ensure that the low half of the 633 // word will never look like that of a real oop. 634 // 635 // Using the OS-supplied non-memory-address word (usually 0 or -1) 636 // will take care of the high bits, however many there are. 637 638 if (_non_oop_bits == 0) { 639 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 640 } 641 642 return (void*)_non_oop_bits; 643 } 644 645 jint universe_init() { 646 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 647 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 648 "LogHeapWordSize is incorrect."); 649 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 650 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 651 "oop size is not not a multiple of HeapWord size"); 652 TraceTime timer("Genesis", TraceStartupTime); 653 JavaClasses::compute_hard_coded_offsets(); 654 655 jint status = Universe::initialize_heap(); 656 if (status != JNI_OK) { 657 return status; 658 } 659 660 Metaspace::global_initialize(); 661 662 // Checks 'AfterMemoryInit' constraints. 663 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) { 664 return JNI_EINVAL; 665 } 666 667 // Create memory for metadata. Must be after initializing heap for 668 // DumpSharedSpaces. 669 ClassLoaderData::init_null_class_loader_data(); 670 671 // We have a heap so create the Method* caches before 672 // Metaspace::initialize_shared_spaces() tries to populate them. 673 Universe::_finalizer_register_cache = new LatestMethodCache(); 674 Universe::_loader_addClass_cache = new LatestMethodCache(); 675 Universe::_pd_implies_cache = new LatestMethodCache(); 676 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 677 678 if (UseSharedSpaces) { 679 // Read the data structures supporting the shared spaces (shared 680 // system dictionary, symbol table, etc.). After that, access to 681 // the file (other than the mapped regions) is no longer needed, and 682 // the file is closed. Closing the file does not affect the 683 // currently mapped regions. 684 MetaspaceShared::initialize_shared_spaces(); 685 StringTable::create_table(); 686 } else { 687 SymbolTable::create_table(); 688 StringTable::create_table(); 689 ClassLoader::create_package_info_table(); 690 691 if (DumpSharedSpaces) { 692 MetaspaceShared::prepare_for_dumping(); 693 } 694 } 695 696 return JNI_OK; 697 } 698 699 CollectedHeap* Universe::create_heap() { 700 assert(_collectedHeap == NULL, "Heap already created"); 701 #if !INCLUDE_ALL_GCS 702 if (UseParallelGC) { 703 fatal("UseParallelGC not supported in this VM."); 704 } else if (UseG1GC) { 705 fatal("UseG1GC not supported in this VM."); 706 } else if (UseConcMarkSweepGC) { 707 fatal("UseConcMarkSweepGC not supported in this VM."); 708 } else if (UseShenandoahGC) { 709 fatal("UseShenandoahGC not supported in this VM."); 710 } 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 } else if (UseShenandoahGC) { 719 return Universe::create_heap_with_policy<ShenandoahHeap, ShenandoahCollectorPolicy>(); 720 #endif 721 } else if (UseSerialGC) { 722 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>(); 723 } 724 725 ShouldNotReachHere(); 726 return NULL; 727 } 728 729 // Choose the heap base address and oop encoding mode 730 // when compressed oops are used: 731 // Unscaled - Use 32-bits oops without encoding when 732 // NarrowOopHeapBaseMin + heap_size < 4Gb 733 // ZeroBased - Use zero based compressed oops with encoding when 734 // NarrowOopHeapBaseMin + heap_size < 32Gb 735 // HeapBased - Use compressed oops with heap base + encoding. 736 737 jint Universe::initialize_heap() { 738 jint status = JNI_ERR; 739 740 _collectedHeap = create_heap_ext(); 741 if (_collectedHeap == NULL) { 742 _collectedHeap = create_heap(); 743 } 744 745 status = _collectedHeap->initialize(); 746 if (status != JNI_OK) { 747 return status; 748 } 749 750 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 751 752 #ifdef _LP64 753 if (UseCompressedOops) { 754 // Subtract a page because something can get allocated at heap base. 755 // This also makes implicit null checking work, because the 756 // memory+1 page below heap_base needs to cause a signal. 757 // See needs_explicit_null_check. 758 // Only set the heap base for compressed oops because it indicates 759 // compressed oops for pstack code. 760 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 761 // Didn't reserve heap below 4Gb. Must shift. 762 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 763 } 764 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 765 // Did reserve heap below 32Gb. Can use base == 0; 766 Universe::set_narrow_oop_base(0); 767 } 768 769 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 770 771 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 772 Universe::print_compressed_oops_mode(tty); 773 } 774 775 // Tell tests in which mode we run. 776 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 777 narrow_oop_mode_to_string(narrow_oop_mode()), 778 false)); 779 } 780 // Universe::narrow_oop_base() is one page below the heap. 781 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 782 os::vm_page_size()) || 783 Universe::narrow_oop_base() == NULL, "invalid value"); 784 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 785 Universe::narrow_oop_shift() == 0, "invalid value"); 786 #endif 787 788 // We will never reach the CATCH below since Exceptions::_throw will cause 789 // the VM to exit if an exception is thrown during initialization 790 791 if (UseTLAB) { 792 assert(Universe::heap()->supports_tlab_allocation(), 793 "Should support thread-local allocation buffers"); 794 ThreadLocalAllocBuffer::startup_initialization(); 795 } 796 return JNI_OK; 797 } 798 799 void Universe::print_compressed_oops_mode(outputStream* st) { 800 st->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 801 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 802 803 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 804 805 if (Universe::narrow_oop_base() != 0) { 806 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 807 } 808 809 if (Universe::narrow_oop_shift() != 0) { 810 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 811 } 812 813 if (!Universe::narrow_oop_use_implicit_null_checks()) { 814 st->print(", no protected page in front of the heap"); 815 } 816 st->cr(); 817 } 818 819 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 820 821 assert(alignment <= Arguments::conservative_max_heap_alignment(), 822 err_msg("actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 823 alignment, Arguments::conservative_max_heap_alignment())); 824 825 size_t total_reserved = align_size_up(heap_size, alignment); 826 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 827 "heap size is too big for compressed oops"); 828 829 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size()); 830 assert(!UseLargePages 831 || UseParallelGC 832 || use_large_pages, "Wrong alignment to use large pages"); 833 834 // Now create the space. 835 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages); 836 837 if (total_rs.is_reserved()) { 838 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 839 "must be exactly of required size and alignment"); 840 // We are good. 841 842 if (UseCompressedOops) { 843 // Universe::initialize_heap() will reset this to NULL if unscaled 844 // or zero-based narrow oops are actually used. 845 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 846 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 847 } 848 849 return total_rs; 850 } 851 852 vm_exit_during_initialization( 853 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 854 total_reserved/K)); 855 856 // satisfy compiler 857 ShouldNotReachHere(); 858 return ReservedHeapSpace(0, 0, false); 859 } 860 861 862 // It's the caller's responsibility to ensure glitch-freedom 863 // (if required). 864 void Universe::update_heap_info_at_gc() { 865 _heap_capacity_at_last_gc = heap()->capacity(); 866 _heap_used_at_last_gc = heap()->used(); 867 } 868 869 870 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 871 switch (mode) { 872 case UnscaledNarrowOop: 873 return "32-bit"; 874 case ZeroBasedNarrowOop: 875 return "Zero based"; 876 case DisjointBaseNarrowOop: 877 return "Non-zero disjoint base"; 878 case HeapBasedNarrowOop: 879 return "Non-zero based"; 880 } 881 882 ShouldNotReachHere(); 883 return ""; 884 } 885 886 887 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 888 if (narrow_oop_base_disjoint()) { 889 return DisjointBaseNarrowOop; 890 } 891 892 if (narrow_oop_base() != 0) { 893 return HeapBasedNarrowOop; 894 } 895 896 if (narrow_oop_shift() != 0) { 897 return ZeroBasedNarrowOop; 898 } 899 900 return UnscaledNarrowOop; 901 } 902 903 904 void universe2_init() { 905 EXCEPTION_MARK; 906 Universe::genesis(CATCH); 907 } 908 909 910 bool universe_post_init() { 911 assert(!is_init_completed(), "Error: initialization not yet completed!"); 912 Universe::_fully_initialized = true; 913 EXCEPTION_MARK; 914 { ResourceMark rm; 915 Interpreter::initialize(); // needed for interpreter entry points 916 if (!UseSharedSpaces) { 917 HandleMark hm(THREAD); 918 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 919 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 920 Universe::reinitialize_itables(CHECK_false); 921 } 922 } 923 924 HandleMark hm(THREAD); 925 Klass* k; 926 instanceKlassHandle k_h; 927 // Setup preallocated empty java.lang.Class array 928 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 929 930 // Setup preallocated OutOfMemoryError errors 931 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 932 k_h = instanceKlassHandle(THREAD, k); 933 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 934 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); 935 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); 936 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 937 Universe::_out_of_memory_error_gc_overhead_limit = 938 k_h->allocate_instance(CHECK_false); 939 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false); 940 941 // Setup preallocated NullPointerException 942 // (this is currently used for a cheap & dirty solution in compiler exception handling) 943 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 944 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 945 // Setup preallocated ArithmeticException 946 // (this is currently used for a cheap & dirty solution in compiler exception handling) 947 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 948 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 949 // Virtual Machine Error for when we get into a situation we can't resolve 950 k = SystemDictionary::resolve_or_fail( 951 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 952 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 953 if (!linked) { 954 tty->print_cr("Unable to link/verify VirtualMachineError class"); 955 return false; // initialization failed 956 } 957 Universe::_virtual_machine_error_instance = 958 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 959 960 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 961 962 if (!DumpSharedSpaces) { 963 // These are the only Java fields that are currently set during shared space dumping. 964 // We prefer to not handle this generally, so we always reinitialize these detail messages. 965 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 966 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 967 968 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 969 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 970 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 971 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 972 973 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 974 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 975 976 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 977 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 978 979 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 980 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 981 982 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 983 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 984 985 // Setup the array of errors that have preallocated backtrace 986 k = Universe::_out_of_memory_error_java_heap->klass(); 987 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 988 k_h = instanceKlassHandle(THREAD, k); 989 990 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 991 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 992 for (int i=0; i<len; i++) { 993 oop err = k_h->allocate_instance(CHECK_false); 994 Handle err_h = Handle(THREAD, err); 995 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 996 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 997 } 998 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 999 } 1000 1001 1002 // Setup static method for registering finalizers 1003 // The finalizer klass must be linked before looking up the method, in 1004 // case it needs to get rewritten. 1005 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); 1006 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( 1007 vmSymbols::register_method_name(), 1008 vmSymbols::register_method_signature()); 1009 if (m == NULL || !m->is_static()) { 1010 tty->print_cr("Unable to link/verify Finalizer.register method"); 1011 return false; // initialization failed (cannot throw exception yet) 1012 } 1013 Universe::_finalizer_register_cache->init( 1014 SystemDictionary::Finalizer_klass(), m); 1015 1016 InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->link_class(CHECK_false); 1017 m = InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->find_method( 1018 vmSymbols::throwIllegalAccessError_name(), 1019 vmSymbols::void_method_signature()); 1020 if (m != NULL && !m->is_static()) { 1021 // Note null is okay; this method is used in itables, and if it is null, 1022 // then AbstractMethodError is thrown instead. 1023 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method"); 1024 return false; // initialization failed (cannot throw exception yet) 1025 } 1026 Universe::_throw_illegal_access_error_cache->init( 1027 SystemDictionary::misc_Unsafe_klass(), m); 1028 1029 // Setup method for registering loaded classes in class loader vector 1030 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); 1031 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1032 if (m == NULL || m->is_static()) { 1033 tty->print_cr("Unable to link/verify ClassLoader.addClass method"); 1034 return false; // initialization failed (cannot throw exception yet) 1035 } 1036 Universe::_loader_addClass_cache->init( 1037 SystemDictionary::ClassLoader_klass(), m); 1038 1039 // Setup method for checking protection domain 1040 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false); 1041 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())-> 1042 find_method(vmSymbols::impliesCreateAccessControlContext_name(), 1043 vmSymbols::void_boolean_signature()); 1044 // Allow NULL which should only happen with bootstrapping. 1045 if (m != NULL) { 1046 if (m->is_static()) { 1047 // NoSuchMethodException doesn't actually work because it tries to run the 1048 // <init> function before java_lang_Class is linked. Print error and exit. 1049 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); 1050 return false; // initialization failed 1051 } 1052 Universe::_pd_implies_cache->init( 1053 SystemDictionary::ProtectionDomain_klass(), m); 1054 } 1055 1056 // This needs to be done before the first scavenge/gc, since 1057 // it's an input to soft ref clearing policy. 1058 { 1059 MutexLocker x(Heap_lock); 1060 Universe::update_heap_info_at_gc(); 1061 } 1062 1063 // ("weak") refs processing infrastructure initialization 1064 Universe::heap()->post_initialize(); 1065 1066 // Initialize performance counters for metaspaces 1067 MetaspaceCounters::initialize_performance_counters(); 1068 CompressedClassSpaceCounters::initialize_performance_counters(); 1069 1070 MemoryService::add_metaspace_memory_pools(); 1071 1072 MemoryService::set_universe_heap(Universe::heap()); 1073 #if INCLUDE_CDS 1074 SharedClassUtil::initialize(CHECK_false); 1075 #endif 1076 return true; 1077 } 1078 1079 1080 void Universe::compute_base_vtable_size() { 1081 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1082 } 1083 1084 1085 void Universe::print() { 1086 print_on(gclog_or_tty); 1087 } 1088 1089 void Universe::print_on(outputStream* st, bool extended) { 1090 st->print_cr("Heap"); 1091 if (!extended) { 1092 heap()->print_on(st); 1093 } else { 1094 heap()->print_extended_on(st); 1095 } 1096 } 1097 1098 void Universe::print_heap_at_SIGBREAK() { 1099 if (PrintHeapAtSIGBREAK) { 1100 MutexLocker hl(Heap_lock); 1101 print_on(tty); 1102 tty->cr(); 1103 tty->flush(); 1104 } 1105 } 1106 1107 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1108 st->print_cr("{Heap before GC invocations=%u (full %u):", 1109 heap()->total_collections(), 1110 heap()->total_full_collections()); 1111 if (!PrintHeapAtGCExtended || ignore_extended) { 1112 heap()->print_on(st); 1113 } else { 1114 heap()->print_extended_on(st); 1115 } 1116 } 1117 1118 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1119 st->print_cr("Heap after GC invocations=%u (full %u):", 1120 heap()->total_collections(), 1121 heap()->total_full_collections()); 1122 if (!PrintHeapAtGCExtended || ignore_extended) { 1123 heap()->print_on(st); 1124 } else { 1125 heap()->print_extended_on(st); 1126 } 1127 st->print_cr("}"); 1128 } 1129 1130 void Universe::verify(VerifyOption option, const char* prefix, bool silent) { 1131 // The use of _verify_in_progress is a temporary work around for 1132 // 6320749. Don't bother with a creating a class to set and clear 1133 // it since it is only used in this method and the control flow is 1134 // straight forward. 1135 _verify_in_progress = true; 1136 1137 COMPILER2_PRESENT( 1138 assert(!DerivedPointerTable::is_active(), 1139 "DPT should not be active during verification " 1140 "(of thread stacks below)"); 1141 ) 1142 1143 ResourceMark rm; 1144 HandleMark hm; // Handles created during verification can be zapped 1145 _verify_count++; 1146 1147 if (!silent) gclog_or_tty->print("%s", prefix); 1148 if (!silent) gclog_or_tty->print("[Verifying "); 1149 if (!silent) gclog_or_tty->print("threads "); 1150 Threads::verify(); 1151 if (!silent) gclog_or_tty->print("heap "); 1152 heap()->verify(silent, option); 1153 if (!silent) gclog_or_tty->print("syms "); 1154 SymbolTable::verify(); 1155 if (!silent) gclog_or_tty->print("strs "); 1156 StringTable::verify(); 1157 { 1158 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1159 if (!silent) gclog_or_tty->print("zone "); 1160 CodeCache::verify(); 1161 } 1162 if (!silent) gclog_or_tty->print("dict "); 1163 SystemDictionary::verify(); 1164 #ifndef PRODUCT 1165 if (!silent) gclog_or_tty->print("cldg "); 1166 ClassLoaderDataGraph::verify(); 1167 #endif 1168 if (!silent) gclog_or_tty->print("metaspace chunks "); 1169 MetaspaceAux::verify_free_chunks(); 1170 if (!silent) gclog_or_tty->print("hand "); 1171 JNIHandles::verify(); 1172 if (!silent) gclog_or_tty->print("C-heap "); 1173 os::check_heap(); 1174 if (!silent) gclog_or_tty->print("code cache "); 1175 CodeCache::verify_oops(); 1176 if (!silent) gclog_or_tty->print_cr("]"); 1177 1178 _verify_in_progress = false; 1179 } 1180 1181 // Oop verification (see MacroAssembler::verify_oop) 1182 1183 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; 1184 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; 1185 1186 1187 #ifndef PRODUCT 1188 1189 static void calculate_verify_data(uintptr_t verify_data[2], 1190 HeapWord* low_boundary, 1191 HeapWord* high_boundary) { 1192 assert(low_boundary < high_boundary, "bad interval"); 1193 1194 // decide which low-order bits we require to be clear: 1195 size_t alignSize = MinObjAlignmentInBytes; 1196 size_t min_object_size = CollectedHeap::min_fill_size(); 1197 1198 // make an inclusive limit: 1199 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1200 uintptr_t min = (uintptr_t)low_boundary; 1201 assert(min < max, "bad interval"); 1202 uintptr_t diff = max ^ min; 1203 1204 // throw away enough low-order bits to make the diff vanish 1205 uintptr_t mask = (uintptr_t)(-1); 1206 while ((mask & diff) != 0) 1207 mask <<= 1; 1208 uintptr_t bits = (min & mask); 1209 assert(bits == (max & mask), "correct mask"); 1210 // check an intermediate value between min and max, just to make sure: 1211 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1212 1213 // require address alignment, too: 1214 mask |= (alignSize - 1); 1215 1216 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { 1217 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); 1218 } 1219 verify_data[0] = mask; 1220 verify_data[1] = bits; 1221 } 1222 1223 // Oop verification (see MacroAssembler::verify_oop) 1224 1225 uintptr_t Universe::verify_oop_mask() { 1226 MemRegion m = heap()->reserved_region(); 1227 calculate_verify_data(_verify_oop_data, 1228 m.start(), 1229 m.end()); 1230 return _verify_oop_data[0]; 1231 } 1232 1233 1234 1235 uintptr_t Universe::verify_oop_bits() { 1236 verify_oop_mask(); 1237 return _verify_oop_data[1]; 1238 } 1239 1240 uintptr_t Universe::verify_mark_mask() { 1241 return markOopDesc::lock_mask_in_place; 1242 } 1243 1244 uintptr_t Universe::verify_mark_bits() { 1245 intptr_t mask = verify_mark_mask(); 1246 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1247 assert((bits & ~mask) == 0, "no stray header bits"); 1248 return bits; 1249 } 1250 #endif // PRODUCT 1251 1252 1253 void Universe::compute_verify_oop_data() { 1254 verify_oop_mask(); 1255 verify_oop_bits(); 1256 verify_mark_mask(); 1257 verify_mark_bits(); 1258 } 1259 1260 1261 void LatestMethodCache::init(Klass* k, Method* m) { 1262 if (!UseSharedSpaces) { 1263 _klass = k; 1264 } 1265 #ifndef PRODUCT 1266 else { 1267 // sharing initilization should have already set up _klass 1268 assert(_klass != NULL, "just checking"); 1269 } 1270 #endif 1271 1272 _method_idnum = m->method_idnum(); 1273 assert(_method_idnum >= 0, "sanity check"); 1274 } 1275 1276 1277 Method* LatestMethodCache::get_method() { 1278 if (klass() == NULL) return NULL; 1279 InstanceKlass* ik = InstanceKlass::cast(klass()); 1280 Method* m = ik->method_with_idnum(method_idnum()); 1281 assert(m != NULL, "sanity check"); 1282 return m; 1283 } 1284 1285 1286 #ifdef ASSERT 1287 // Release dummy object(s) at bottom of heap 1288 bool Universe::release_fullgc_alot_dummy() { 1289 MutexLocker ml(FullGCALot_lock); 1290 if (_fullgc_alot_dummy_array != NULL) { 1291 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1292 // No more dummies to release, release entire array instead 1293 _fullgc_alot_dummy_array = NULL; 1294 return false; 1295 } 1296 if (!UseConcMarkSweepGC) { 1297 // Release dummy at bottom of old generation 1298 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1299 } 1300 // Release dummy at bottom of permanent generation 1301 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1302 } 1303 return true; 1304 } 1305 1306 #endif // ASSERT