1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/classLoaderData.hpp" 28 #include "classfile/javaClasses.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "code/codeCache.hpp" 33 #include "code/dependencies.hpp" 34 #include "gc/shared/cardTableModRefBS.hpp" 35 #include "gc/shared/collectedHeap.inline.hpp" 36 #include "gc/shared/gcLocker.inline.hpp" 37 #include "gc/shared/genCollectedHeap.hpp" 38 #include "gc/shared/generation.hpp" 39 #include "gc/shared/gcTraceTime.inline.hpp" 40 #include "gc/shared/space.hpp" 41 #include "interpreter/interpreter.hpp" 42 #include "logging/log.hpp" 43 #include "memory/filemap.hpp" 44 #include "memory/metadataFactory.hpp" 45 #include "memory/metaspaceShared.hpp" 46 #include "memory/oopFactory.hpp" 47 #include "memory/universe.hpp" 48 #include "memory/universe.inline.hpp" 49 #include "oops/constantPool.hpp" 50 #include "oops/instanceClassLoaderKlass.hpp" 51 #include "oops/instanceKlass.hpp" 52 #include "oops/instanceMirrorKlass.hpp" 53 #include "oops/instanceRefKlass.hpp" 54 #include "oops/objArrayOop.inline.hpp" 55 #include "oops/oop.inline.hpp" 56 #include "oops/typeArrayKlass.hpp" 57 #include "prims/jvmtiRedefineClassesTrace.hpp" 58 #include "runtime/arguments.hpp" 59 #include "runtime/atomic.inline.hpp" 60 #include "runtime/commandLineFlagConstraintList.hpp" 61 #include "runtime/deoptimization.hpp" 62 #include "runtime/fprofiler.hpp" 63 #include "runtime/handles.inline.hpp" 64 #include "runtime/init.hpp" 65 #include "runtime/java.hpp" 66 #include "runtime/javaCalls.hpp" 67 #include "runtime/sharedRuntime.hpp" 68 #include "runtime/synchronizer.hpp" 69 #include "runtime/thread.inline.hpp" 70 #include "runtime/timerTrace.hpp" 71 #include "runtime/vm_operations.hpp" 72 #include "services/memoryService.hpp" 73 #include "utilities/copy.hpp" 74 #include "utilities/events.hpp" 75 #include "utilities/hashtable.inline.hpp" 76 #include "utilities/macros.hpp" 77 #include "utilities/ostream.hpp" 78 #include "utilities/preserveException.hpp" 79 #if INCLUDE_ALL_GCS 80 #include "gc/cms/cmsCollectorPolicy.hpp" 81 #include "gc/g1/g1CollectedHeap.inline.hpp" 82 #include "gc/g1/g1CollectorPolicy.hpp" 83 #include "gc/parallel/parallelScavengeHeap.hpp" 84 #include "gc/shared/adaptiveSizePolicy.hpp" 85 #endif // INCLUDE_ALL_GCS 86 #if INCLUDE_CDS 87 #include "classfile/sharedClassUtil.hpp" 88 #endif 89 90 // Known objects 91 Klass* Universe::_boolArrayKlassObj = NULL; 92 Klass* Universe::_byteArrayKlassObj = NULL; 93 Klass* Universe::_charArrayKlassObj = NULL; 94 Klass* Universe::_intArrayKlassObj = NULL; 95 Klass* Universe::_shortArrayKlassObj = NULL; 96 Klass* Universe::_longArrayKlassObj = NULL; 97 Klass* Universe::_singleArrayKlassObj = NULL; 98 Klass* Universe::_doubleArrayKlassObj = NULL; 99 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 100 Klass* Universe::_objectArrayKlassObj = NULL; 101 oop Universe::_int_mirror = NULL; 102 oop Universe::_float_mirror = NULL; 103 oop Universe::_double_mirror = NULL; 104 oop Universe::_byte_mirror = NULL; 105 oop Universe::_bool_mirror = NULL; 106 oop Universe::_char_mirror = NULL; 107 oop Universe::_long_mirror = NULL; 108 oop Universe::_short_mirror = NULL; 109 oop Universe::_void_mirror = NULL; 110 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 111 oop Universe::_main_thread_group = NULL; 112 oop Universe::_system_thread_group = NULL; 113 objArrayOop Universe::_the_empty_class_klass_array = NULL; 114 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 115 oop Universe::_the_null_string = NULL; 116 oop Universe::_the_min_jint_string = NULL; 117 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 118 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 119 LatestMethodCache* Universe::_pd_implies_cache = NULL; 120 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 121 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 122 oop Universe::_out_of_memory_error_java_heap = NULL; 123 oop Universe::_out_of_memory_error_metaspace = NULL; 124 oop Universe::_out_of_memory_error_class_metaspace = NULL; 125 oop Universe::_out_of_memory_error_array_size = NULL; 126 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 127 oop Universe::_out_of_memory_error_realloc_objects = NULL; 128 oop Universe::_delayed_stack_overflow_error_message = NULL; 129 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 130 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 131 bool Universe::_verify_in_progress = false; 132 long Universe::verify_flags = Universe::Verify_All; 133 oop Universe::_null_ptr_exception_instance = NULL; 134 oop Universe::_arithmetic_exception_instance = NULL; 135 oop Universe::_virtual_machine_error_instance = NULL; 136 oop Universe::_vm_exception = NULL; 137 oop Universe::_allocation_context_notification_obj = NULL; 138 139 Array<int>* Universe::_the_empty_int_array = NULL; 140 Array<u2>* Universe::_the_empty_short_array = NULL; 141 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 142 Array<Method*>* Universe::_the_empty_method_array = NULL; 143 144 // These variables are guarded by FullGCALot_lock. 145 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 146 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 147 148 // Heap 149 int Universe::_verify_count = 0; 150 151 // Oop verification (see MacroAssembler::verify_oop) 152 uintptr_t Universe::_verify_oop_mask = 0; 153 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 154 155 int Universe::_base_vtable_size = 0; 156 bool Universe::_bootstrapping = false; 157 bool Universe::_fully_initialized = false; 158 159 size_t Universe::_heap_capacity_at_last_gc; 160 size_t Universe::_heap_used_at_last_gc = 0; 161 162 CollectedHeap* Universe::_collectedHeap = NULL; 163 164 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 165 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 166 address Universe::_narrow_ptrs_base; 167 168 void Universe::basic_type_classes_do(void f(Klass*)) { 169 f(boolArrayKlassObj()); 170 f(byteArrayKlassObj()); 171 f(charArrayKlassObj()); 172 f(intArrayKlassObj()); 173 f(shortArrayKlassObj()); 174 f(longArrayKlassObj()); 175 f(singleArrayKlassObj()); 176 f(doubleArrayKlassObj()); 177 } 178 179 void Universe::oops_do(OopClosure* f, bool do_all) { 180 181 f->do_oop((oop*) &_int_mirror); 182 f->do_oop((oop*) &_float_mirror); 183 f->do_oop((oop*) &_double_mirror); 184 f->do_oop((oop*) &_byte_mirror); 185 f->do_oop((oop*) &_bool_mirror); 186 f->do_oop((oop*) &_char_mirror); 187 f->do_oop((oop*) &_long_mirror); 188 f->do_oop((oop*) &_short_mirror); 189 f->do_oop((oop*) &_void_mirror); 190 191 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 192 f->do_oop((oop*) &_mirrors[i]); 193 } 194 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 195 196 f->do_oop((oop*)&_the_empty_class_klass_array); 197 f->do_oop((oop*)&_the_null_string); 198 f->do_oop((oop*)&_the_min_jint_string); 199 f->do_oop((oop*)&_out_of_memory_error_java_heap); 200 f->do_oop((oop*)&_out_of_memory_error_metaspace); 201 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 202 f->do_oop((oop*)&_out_of_memory_error_array_size); 203 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 204 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 205 f->do_oop((oop*)&_delayed_stack_overflow_error_message); 206 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 207 f->do_oop((oop*)&_null_ptr_exception_instance); 208 f->do_oop((oop*)&_arithmetic_exception_instance); 209 f->do_oop((oop*)&_virtual_machine_error_instance); 210 f->do_oop((oop*)&_main_thread_group); 211 f->do_oop((oop*)&_system_thread_group); 212 f->do_oop((oop*)&_vm_exception); 213 f->do_oop((oop*)&_allocation_context_notification_obj); 214 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 215 } 216 217 // Serialize metadata in and out of CDS archive, not oops. 218 void Universe::serialize(SerializeClosure* f, bool do_all) { 219 220 f->do_ptr((void**)&_boolArrayKlassObj); 221 f->do_ptr((void**)&_byteArrayKlassObj); 222 f->do_ptr((void**)&_charArrayKlassObj); 223 f->do_ptr((void**)&_intArrayKlassObj); 224 f->do_ptr((void**)&_shortArrayKlassObj); 225 f->do_ptr((void**)&_longArrayKlassObj); 226 f->do_ptr((void**)&_singleArrayKlassObj); 227 f->do_ptr((void**)&_doubleArrayKlassObj); 228 f->do_ptr((void**)&_objectArrayKlassObj); 229 230 { 231 for (int i = 0; i < T_VOID+1; i++) { 232 if (_typeArrayKlassObjs[i] != NULL) { 233 assert(i >= T_BOOLEAN, "checking"); 234 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 235 } else if (do_all) { 236 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 237 } 238 } 239 } 240 241 f->do_ptr((void**)&_the_array_interfaces_array); 242 f->do_ptr((void**)&_the_empty_int_array); 243 f->do_ptr((void**)&_the_empty_short_array); 244 f->do_ptr((void**)&_the_empty_method_array); 245 f->do_ptr((void**)&_the_empty_klass_array); 246 _finalizer_register_cache->serialize(f); 247 _loader_addClass_cache->serialize(f); 248 _pd_implies_cache->serialize(f); 249 _throw_illegal_access_error_cache->serialize(f); 250 _do_stack_walk_cache->serialize(f); 251 } 252 253 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 254 if (size < alignment || size % alignment != 0) { 255 vm_exit_during_initialization( 256 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 257 } 258 } 259 260 void initialize_basic_type_klass(Klass* k, TRAPS) { 261 Klass* ok = SystemDictionary::Object_klass(); 262 if (UseSharedSpaces) { 263 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 264 assert(k->super() == ok, "u3"); 265 k->restore_unshareable_info(loader_data, Handle(), CHECK); 266 } else { 267 k->initialize_supers(ok, CHECK); 268 } 269 k->append_to_sibling_list(); 270 } 271 272 void Universe::genesis(TRAPS) { 273 ResourceMark rm; 274 275 { FlagSetting fs(_bootstrapping, true); 276 277 { MutexLocker mc(Compile_lock); 278 279 // determine base vtable size; without that we cannot create the array klasses 280 compute_base_vtable_size(); 281 282 if (!UseSharedSpaces) { 283 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 284 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 285 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 286 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 287 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 288 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 289 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 290 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 291 292 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 293 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 294 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 295 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 296 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 297 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 298 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 299 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 300 301 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 302 303 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 304 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 305 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 306 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 307 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 308 } 309 } 310 311 vmSymbols::initialize(CHECK); 312 313 SystemDictionary::initialize(CHECK); 314 315 Klass* ok = SystemDictionary::Object_klass(); 316 317 _the_null_string = StringTable::intern("null", CHECK); 318 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 319 320 if (UseSharedSpaces) { 321 // Verify shared interfaces array. 322 assert(_the_array_interfaces_array->at(0) == 323 SystemDictionary::Cloneable_klass(), "u3"); 324 assert(_the_array_interfaces_array->at(1) == 325 SystemDictionary::Serializable_klass(), "u3"); 326 MetaspaceShared::fixup_shared_string_regions(); 327 } else { 328 // Set up shared interfaces array. (Do this before supers are set up.) 329 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 330 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 331 } 332 333 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 334 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 335 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 336 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 337 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 338 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 339 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 340 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 341 } // end of core bootstrapping 342 343 // Maybe this could be lifted up now that object array can be initialized 344 // during the bootstrapping. 345 346 // OLD 347 // Initialize _objectArrayKlass after core bootstraping to make 348 // sure the super class is set up properly for _objectArrayKlass. 349 // --- 350 // NEW 351 // Since some of the old system object arrays have been converted to 352 // ordinary object arrays, _objectArrayKlass will be loaded when 353 // SystemDictionary::initialize(CHECK); is run. See the extra check 354 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 355 _objectArrayKlassObj = InstanceKlass:: 356 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 357 // OLD 358 // Add the class to the class hierarchy manually to make sure that 359 // its vtable is initialized after core bootstrapping is completed. 360 // --- 361 // New 362 // Have already been initialized. 363 _objectArrayKlassObj->append_to_sibling_list(); 364 365 #ifdef ASSERT 366 if (FullGCALot) { 367 // Allocate an array of dummy objects. 368 // We'd like these to be at the bottom of the old generation, 369 // so that when we free one and then collect, 370 // (almost) the whole heap moves 371 // and we find out if we actually update all the oops correctly. 372 // But we can't allocate directly in the old generation, 373 // so we allocate wherever, and hope that the first collection 374 // moves these objects to the bottom of the old generation. 375 // We can allocate directly in the permanent generation, so we do. 376 int size; 377 if (UseConcMarkSweepGC) { 378 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate"); 379 size = FullGCALotDummies; 380 } else { 381 size = FullGCALotDummies * 2; 382 } 383 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 384 objArrayHandle dummy_array(THREAD, naked_array); 385 int i = 0; 386 while (i < size) { 387 // Allocate dummy in old generation 388 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 389 dummy_array->obj_at_put(i++, dummy); 390 } 391 { 392 // Only modify the global variable inside the mutex. 393 // If we had a race to here, the other dummy_array instances 394 // and their elements just get dropped on the floor, which is fine. 395 MutexLocker ml(FullGCALot_lock); 396 if (_fullgc_alot_dummy_array == NULL) { 397 _fullgc_alot_dummy_array = dummy_array(); 398 } 399 } 400 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 401 } 402 #endif 403 404 // Initialize dependency array for null class loader 405 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 406 407 } 408 409 // CDS support for patching vtables in metadata in the shared archive. 410 // All types inherited from Metadata have vtables, but not types inherited 411 // from MetaspaceObj, because the latter does not have virtual functions. 412 // If the metadata type has a vtable, it cannot be shared in the read-only 413 // section of the CDS archive, because the vtable pointer is patched. 414 static inline void add_vtable(void** list, int* n, void* o, int count) { 415 guarantee((*n) < count, "vtable list too small"); 416 void* vtable = dereference_vptr(o); 417 assert(*(void**)(vtable) != NULL, "invalid vtable"); 418 list[(*n)++] = vtable; 419 } 420 421 void Universe::init_self_patching_vtbl_list(void** list, int count) { 422 int n = 0; 423 { InstanceKlass o; add_vtable(list, &n, &o, count); } 424 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 425 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 426 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 427 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 428 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 429 { Method o; add_vtable(list, &n, &o, count); } 430 { ConstantPool o; add_vtable(list, &n, &o, count); } 431 } 432 433 void Universe::initialize_basic_type_mirrors(TRAPS) { 434 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 435 _int_mirror = 436 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 437 _float_mirror = 438 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 439 _double_mirror = 440 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 441 _byte_mirror = 442 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 443 _bool_mirror = 444 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 445 _char_mirror = 446 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 447 _long_mirror = 448 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 449 _short_mirror = 450 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 451 _void_mirror = 452 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 453 454 _mirrors[T_INT] = _int_mirror; 455 _mirrors[T_FLOAT] = _float_mirror; 456 _mirrors[T_DOUBLE] = _double_mirror; 457 _mirrors[T_BYTE] = _byte_mirror; 458 _mirrors[T_BOOLEAN] = _bool_mirror; 459 _mirrors[T_CHAR] = _char_mirror; 460 _mirrors[T_LONG] = _long_mirror; 461 _mirrors[T_SHORT] = _short_mirror; 462 _mirrors[T_VOID] = _void_mirror; 463 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 464 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 465 } 466 467 void Universe::fixup_mirrors(TRAPS) { 468 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 469 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 470 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 471 // that the number of objects allocated at this point is very small. 472 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 473 HandleMark hm(THREAD); 474 // Cache the start of the static fields 475 InstanceMirrorKlass::init_offset_of_static_fields(); 476 477 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 478 int list_length = list->length(); 479 for (int i = 0; i < list_length; i++) { 480 Klass* k = list->at(i); 481 assert(k->is_klass(), "List should only hold classes"); 482 EXCEPTION_MARK; 483 KlassHandle kh(THREAD, k); 484 java_lang_Class::fixup_mirror(kh, CATCH); 485 } 486 delete java_lang_Class::fixup_mirror_list(); 487 java_lang_Class::set_fixup_mirror_list(NULL); 488 } 489 490 static bool has_run_finalizers_on_exit = false; 491 492 void Universe::run_finalizers_on_exit() { 493 if (has_run_finalizers_on_exit) return; 494 has_run_finalizers_on_exit = true; 495 496 // Called on VM exit. This ought to be run in a separate thread. 497 log_trace(ref)("Callback to run finalizers on exit"); 498 { 499 PRESERVE_EXCEPTION_MARK; 500 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 501 JavaValue result(T_VOID); 502 JavaCalls::call_static( 503 &result, 504 finalizer_klass, 505 vmSymbols::run_finalizers_on_exit_name(), 506 vmSymbols::void_method_signature(), 507 THREAD 508 ); 509 // Ignore any pending exceptions 510 CLEAR_PENDING_EXCEPTION; 511 } 512 } 513 514 515 // initialize_vtable could cause gc if 516 // 1) we specified true to initialize_vtable and 517 // 2) this ran after gc was enabled 518 // In case those ever change we use handles for oops 519 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 520 // init vtable of k and all subclasses 521 Klass* ko = k_h(); 522 klassVtable* vt = ko->vtable(); 523 if (vt) vt->initialize_vtable(false, CHECK); 524 if (ko->is_instance_klass()) { 525 for (KlassHandle s_h(THREAD, ko->subklass()); 526 s_h() != NULL; 527 s_h = KlassHandle(THREAD, s_h()->next_sibling())) { 528 reinitialize_vtable_of(s_h, CHECK); 529 } 530 } 531 } 532 533 534 void initialize_itable_for_klass(Klass* k, TRAPS) { 535 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 536 } 537 538 539 void Universe::reinitialize_itables(TRAPS) { 540 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 541 542 } 543 544 545 bool Universe::on_page_boundary(void* addr) { 546 return ((uintptr_t) addr) % os::vm_page_size() == 0; 547 } 548 549 550 bool Universe::should_fill_in_stack_trace(Handle throwable) { 551 // never attempt to fill in the stack trace of preallocated errors that do not have 552 // backtrace. These errors are kept alive forever and may be "re-used" when all 553 // preallocated errors with backtrace have been consumed. Also need to avoid 554 // a potential loop which could happen if an out of memory occurs when attempting 555 // to allocate the backtrace. 556 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 557 (throwable() != Universe::_out_of_memory_error_metaspace) && 558 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 559 (throwable() != Universe::_out_of_memory_error_array_size) && 560 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) && 561 (throwable() != Universe::_out_of_memory_error_realloc_objects)); 562 } 563 564 565 oop Universe::gen_out_of_memory_error(oop default_err) { 566 // generate an out of memory error: 567 // - if there is a preallocated error with backtrace available then return it wth 568 // a filled in stack trace. 569 // - if there are no preallocated errors with backtrace available then return 570 // an error without backtrace. 571 int next; 572 if (_preallocated_out_of_memory_error_avail_count > 0) { 573 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 574 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 575 } else { 576 next = -1; 577 } 578 if (next < 0) { 579 // all preallocated errors have been used. 580 // return default 581 return default_err; 582 } else { 583 // get the error object at the slot and set set it to NULL so that the 584 // array isn't keeping it alive anymore. 585 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 586 assert(exc != NULL, "slot has been used already"); 587 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 588 589 // use the message from the default error 590 oop msg = java_lang_Throwable::message(default_err); 591 assert(msg != NULL, "no message"); 592 java_lang_Throwable::set_message(exc, msg); 593 594 // populate the stack trace and return it. 595 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 596 return exc; 597 } 598 } 599 600 intptr_t Universe::_non_oop_bits = 0; 601 602 void* Universe::non_oop_word() { 603 // Neither the high bits nor the low bits of this value is allowed 604 // to look like (respectively) the high or low bits of a real oop. 605 // 606 // High and low are CPU-specific notions, but low always includes 607 // the low-order bit. Since oops are always aligned at least mod 4, 608 // setting the low-order bit will ensure that the low half of the 609 // word will never look like that of a real oop. 610 // 611 // Using the OS-supplied non-memory-address word (usually 0 or -1) 612 // will take care of the high bits, however many there are. 613 614 if (_non_oop_bits == 0) { 615 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 616 } 617 618 return (void*)_non_oop_bits; 619 } 620 621 jint universe_init() { 622 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 623 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 624 "LogHeapWordSize is incorrect."); 625 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 626 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 627 "oop size is not not a multiple of HeapWord size"); 628 629 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 630 631 JavaClasses::compute_hard_coded_offsets(); 632 633 jint status = Universe::initialize_heap(); 634 if (status != JNI_OK) { 635 return status; 636 } 637 638 Metaspace::global_initialize(); 639 640 // Checks 'AfterMemoryInit' constraints. 641 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) { 642 return JNI_EINVAL; 643 } 644 645 // Create memory for metadata. Must be after initializing heap for 646 // DumpSharedSpaces. 647 ClassLoaderData::init_null_class_loader_data(); 648 649 // We have a heap so create the Method* caches before 650 // Metaspace::initialize_shared_spaces() tries to populate them. 651 Universe::_finalizer_register_cache = new LatestMethodCache(); 652 Universe::_loader_addClass_cache = new LatestMethodCache(); 653 Universe::_pd_implies_cache = new LatestMethodCache(); 654 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 655 Universe::_do_stack_walk_cache = new LatestMethodCache(); 656 657 if (UseSharedSpaces) { 658 // Read the data structures supporting the shared spaces (shared 659 // system dictionary, symbol table, etc.). After that, access to 660 // the file (other than the mapped regions) is no longer needed, and 661 // the file is closed. Closing the file does not affect the 662 // currently mapped regions. 663 MetaspaceShared::initialize_shared_spaces(); 664 StringTable::create_table(); 665 } else { 666 SymbolTable::create_table(); 667 StringTable::create_table(); 668 ClassLoader::create_package_info_table(); 669 670 if (DumpSharedSpaces) { 671 MetaspaceShared::prepare_for_dumping(); 672 } 673 } 674 if (strlen(VerifySubSet) > 0) { 675 Universe::initialize_verify_flags(); 676 } 677 678 return JNI_OK; 679 } 680 681 CollectedHeap* Universe::create_heap() { 682 assert(_collectedHeap == NULL, "Heap already created"); 683 #if !INCLUDE_ALL_GCS 684 if (UseParallelGC) { 685 fatal("UseParallelGC not supported in this VM."); 686 } else if (UseG1GC) { 687 fatal("UseG1GC not supported in this VM."); 688 } else if (UseConcMarkSweepGC) { 689 fatal("UseConcMarkSweepGC not supported in this VM."); 690 #else 691 if (UseParallelGC) { 692 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>(); 693 } else if (UseG1GC) { 694 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>(); 695 } else if (UseConcMarkSweepGC) { 696 return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>(); 697 #endif 698 } else if (UseSerialGC) { 699 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>(); 700 } 701 702 ShouldNotReachHere(); 703 return NULL; 704 } 705 706 // Choose the heap base address and oop encoding mode 707 // when compressed oops are used: 708 // Unscaled - Use 32-bits oops without encoding when 709 // NarrowOopHeapBaseMin + heap_size < 4Gb 710 // ZeroBased - Use zero based compressed oops with encoding when 711 // NarrowOopHeapBaseMin + heap_size < 32Gb 712 // HeapBased - Use compressed oops with heap base + encoding. 713 714 jint Universe::initialize_heap() { 715 jint status = JNI_ERR; 716 717 _collectedHeap = create_heap_ext(); 718 if (_collectedHeap == NULL) { 719 _collectedHeap = create_heap(); 720 } 721 722 status = _collectedHeap->initialize(); 723 if (status != JNI_OK) { 724 return status; 725 } 726 log_info(gc)("Using %s", _collectedHeap->name()); 727 728 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 729 730 #ifdef _LP64 731 if (UseCompressedOops) { 732 // Subtract a page because something can get allocated at heap base. 733 // This also makes implicit null checking work, because the 734 // memory+1 page below heap_base needs to cause a signal. 735 // See needs_explicit_null_check. 736 // Only set the heap base for compressed oops because it indicates 737 // compressed oops for pstack code. 738 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 739 // Didn't reserve heap below 4Gb. Must shift. 740 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 741 } 742 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 743 // Did reserve heap below 32Gb. Can use base == 0; 744 Universe::set_narrow_oop_base(0); 745 } 746 747 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 748 749 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 750 Universe::print_compressed_oops_mode(tty); 751 } 752 753 // Tell tests in which mode we run. 754 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 755 narrow_oop_mode_to_string(narrow_oop_mode()), 756 false)); 757 } 758 // Universe::narrow_oop_base() is one page below the heap. 759 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 760 os::vm_page_size()) || 761 Universe::narrow_oop_base() == NULL, "invalid value"); 762 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 763 Universe::narrow_oop_shift() == 0, "invalid value"); 764 #endif 765 766 // We will never reach the CATCH below since Exceptions::_throw will cause 767 // the VM to exit if an exception is thrown during initialization 768 769 if (UseTLAB) { 770 assert(Universe::heap()->supports_tlab_allocation(), 771 "Should support thread-local allocation buffers"); 772 ThreadLocalAllocBuffer::startup_initialization(); 773 } 774 return JNI_OK; 775 } 776 777 void Universe::print_compressed_oops_mode(outputStream* st) { 778 st->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 779 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 780 781 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 782 783 if (Universe::narrow_oop_base() != 0) { 784 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 785 } 786 787 if (Universe::narrow_oop_shift() != 0) { 788 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 789 } 790 791 if (!Universe::narrow_oop_use_implicit_null_checks()) { 792 st->print(", no protected page in front of the heap"); 793 } 794 st->cr(); 795 } 796 797 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 798 799 assert(alignment <= Arguments::conservative_max_heap_alignment(), 800 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 801 alignment, Arguments::conservative_max_heap_alignment()); 802 803 size_t total_reserved = align_size_up(heap_size, alignment); 804 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 805 "heap size is too big for compressed oops"); 806 807 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size()); 808 assert(!UseLargePages 809 || UseParallelGC 810 || use_large_pages, "Wrong alignment to use large pages"); 811 812 // Now create the space. 813 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages); 814 815 if (total_rs.is_reserved()) { 816 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 817 "must be exactly of required size and alignment"); 818 // We are good. 819 820 if (UseCompressedOops) { 821 // Universe::initialize_heap() will reset this to NULL if unscaled 822 // or zero-based narrow oops are actually used. 823 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 824 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 825 } 826 827 return total_rs; 828 } 829 830 vm_exit_during_initialization( 831 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 832 total_reserved/K)); 833 834 // satisfy compiler 835 ShouldNotReachHere(); 836 return ReservedHeapSpace(0, 0, false); 837 } 838 839 840 // It's the caller's responsibility to ensure glitch-freedom 841 // (if required). 842 void Universe::update_heap_info_at_gc() { 843 _heap_capacity_at_last_gc = heap()->capacity(); 844 _heap_used_at_last_gc = heap()->used(); 845 } 846 847 848 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 849 switch (mode) { 850 case UnscaledNarrowOop: 851 return "32-bit"; 852 case ZeroBasedNarrowOop: 853 return "Zero based"; 854 case DisjointBaseNarrowOop: 855 return "Non-zero disjoint base"; 856 case HeapBasedNarrowOop: 857 return "Non-zero based"; 858 } 859 860 ShouldNotReachHere(); 861 return ""; 862 } 863 864 865 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 866 if (narrow_oop_base_disjoint()) { 867 return DisjointBaseNarrowOop; 868 } 869 870 if (narrow_oop_base() != 0) { 871 return HeapBasedNarrowOop; 872 } 873 874 if (narrow_oop_shift() != 0) { 875 return ZeroBasedNarrowOop; 876 } 877 878 return UnscaledNarrowOop; 879 } 880 881 882 void universe2_init() { 883 EXCEPTION_MARK; 884 Universe::genesis(CATCH); 885 } 886 887 888 bool universe_post_init() { 889 assert(!is_init_completed(), "Error: initialization not yet completed!"); 890 Universe::_fully_initialized = true; 891 EXCEPTION_MARK; 892 { ResourceMark rm; 893 Interpreter::initialize(); // needed for interpreter entry points 894 if (!UseSharedSpaces) { 895 HandleMark hm(THREAD); 896 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 897 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 898 Universe::reinitialize_itables(CHECK_false); 899 } 900 } 901 902 HandleMark hm(THREAD); 903 Klass* k; 904 instanceKlassHandle k_h; 905 // Setup preallocated empty java.lang.Class array 906 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 907 908 // Setup preallocated OutOfMemoryError errors 909 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 910 k_h = instanceKlassHandle(THREAD, k); 911 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 912 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); 913 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); 914 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 915 Universe::_out_of_memory_error_gc_overhead_limit = 916 k_h->allocate_instance(CHECK_false); 917 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false); 918 919 // Setup preallocated cause message for delayed StackOverflowError 920 if (StackReservedPages > 0) { 921 Universe::_delayed_stack_overflow_error_message = 922 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 923 } 924 925 // Setup preallocated NullPointerException 926 // (this is currently used for a cheap & dirty solution in compiler exception handling) 927 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 928 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 929 // Setup preallocated ArithmeticException 930 // (this is currently used for a cheap & dirty solution in compiler exception handling) 931 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 932 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 933 // Virtual Machine Error for when we get into a situation we can't resolve 934 k = SystemDictionary::resolve_or_fail( 935 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 936 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 937 if (!linked) { 938 tty->print_cr("Unable to link/verify VirtualMachineError class"); 939 return false; // initialization failed 940 } 941 Universe::_virtual_machine_error_instance = 942 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 943 944 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 945 946 if (!DumpSharedSpaces) { 947 // These are the only Java fields that are currently set during shared space dumping. 948 // We prefer to not handle this generally, so we always reinitialize these detail messages. 949 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 950 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 951 952 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 953 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 954 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 955 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 956 957 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 958 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 959 960 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 961 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 962 963 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 964 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 965 966 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 967 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 968 969 // Setup the array of errors that have preallocated backtrace 970 k = Universe::_out_of_memory_error_java_heap->klass(); 971 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 972 k_h = instanceKlassHandle(THREAD, k); 973 974 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 975 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 976 for (int i=0; i<len; i++) { 977 oop err = k_h->allocate_instance(CHECK_false); 978 Handle err_h = Handle(THREAD, err); 979 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 980 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 981 } 982 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 983 } 984 985 986 // Setup static method for registering finalizers 987 // The finalizer klass must be linked before looking up the method, in 988 // case it needs to get rewritten. 989 SystemDictionary::Finalizer_klass()->link_class(CHECK_false); 990 Method* m = SystemDictionary::Finalizer_klass()->find_method( 991 vmSymbols::register_method_name(), 992 vmSymbols::register_method_signature()); 993 if (m == NULL || !m->is_static()) { 994 tty->print_cr("Unable to link/verify Finalizer.register method"); 995 return false; // initialization failed (cannot throw exception yet) 996 } 997 Universe::_finalizer_register_cache->init( 998 SystemDictionary::Finalizer_klass(), m); 999 1000 SystemDictionary::internal_Unsafe_klass()->link_class(CHECK_false); 1001 m = SystemDictionary::internal_Unsafe_klass()->find_method( 1002 vmSymbols::throwIllegalAccessError_name(), 1003 vmSymbols::void_method_signature()); 1004 if (m != NULL && !m->is_static()) { 1005 // Note null is okay; this method is used in itables, and if it is null, 1006 // then AbstractMethodError is thrown instead. 1007 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method"); 1008 return false; // initialization failed (cannot throw exception yet) 1009 } 1010 Universe::_throw_illegal_access_error_cache->init( 1011 SystemDictionary::internal_Unsafe_klass(), m); 1012 1013 // Setup method for registering loaded classes in class loader vector 1014 SystemDictionary::ClassLoader_klass()->link_class(CHECK_false); 1015 m = SystemDictionary::ClassLoader_klass()->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1016 if (m == NULL || m->is_static()) { 1017 tty->print_cr("Unable to link/verify ClassLoader.addClass method"); 1018 return false; // initialization failed (cannot throw exception yet) 1019 } 1020 Universe::_loader_addClass_cache->init( 1021 SystemDictionary::ClassLoader_klass(), m); 1022 1023 // Setup method for checking protection domain 1024 SystemDictionary::ProtectionDomain_klass()->link_class(CHECK_false); 1025 m = SystemDictionary::ProtectionDomain_klass()-> 1026 find_method(vmSymbols::impliesCreateAccessControlContext_name(), 1027 vmSymbols::void_boolean_signature()); 1028 // Allow NULL which should only happen with bootstrapping. 1029 if (m != NULL) { 1030 if (m->is_static()) { 1031 // NoSuchMethodException doesn't actually work because it tries to run the 1032 // <init> function before java_lang_Class is linked. Print error and exit. 1033 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); 1034 return false; // initialization failed 1035 } 1036 Universe::_pd_implies_cache->init( 1037 SystemDictionary::ProtectionDomain_klass(), m); 1038 } 1039 1040 // Setup method for stack walking 1041 InstanceKlass::cast(SystemDictionary::AbstractStackWalker_klass())->link_class(CHECK_false); 1042 m = InstanceKlass::cast(SystemDictionary::AbstractStackWalker_klass())-> 1043 find_method(vmSymbols::doStackWalk_name(), 1044 vmSymbols::doStackWalk_signature()); 1045 // Allow NULL which should only happen with bootstrapping. 1046 if (m != NULL) { 1047 Universe::_do_stack_walk_cache->init( 1048 SystemDictionary::AbstractStackWalker_klass(), m); 1049 } 1050 1051 // This needs to be done before the first scavenge/gc, since 1052 // it's an input to soft ref clearing policy. 1053 { 1054 MutexLocker x(Heap_lock); 1055 Universe::update_heap_info_at_gc(); 1056 } 1057 1058 // ("weak") refs processing infrastructure initialization 1059 Universe::heap()->post_initialize(); 1060 1061 // Initialize performance counters for metaspaces 1062 MetaspaceCounters::initialize_performance_counters(); 1063 CompressedClassSpaceCounters::initialize_performance_counters(); 1064 1065 MemoryService::add_metaspace_memory_pools(); 1066 1067 MemoryService::set_universe_heap(Universe::heap()); 1068 #if INCLUDE_CDS 1069 SharedClassUtil::initialize(CHECK_false); 1070 #endif 1071 return true; 1072 } 1073 1074 1075 void Universe::compute_base_vtable_size() { 1076 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1077 } 1078 1079 void Universe::print_on(outputStream* st) { 1080 st->print_cr("Heap"); 1081 heap()->print_on(st); 1082 } 1083 1084 void Universe::print_heap_at_SIGBREAK() { 1085 if (PrintHeapAtSIGBREAK) { 1086 MutexLocker hl(Heap_lock); 1087 print_on(tty); 1088 tty->cr(); 1089 tty->flush(); 1090 } 1091 } 1092 1093 void Universe::print_heap_before_gc() { 1094 LogHandle(gc, heap) log; 1095 if (log.is_debug()) { 1096 log.debug("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1097 ResourceMark rm; 1098 heap()->print_on(log.debug_stream()); 1099 } 1100 } 1101 1102 void Universe::print_heap_after_gc() { 1103 LogHandle(gc, heap) log; 1104 if (log.is_debug()) { 1105 log.debug("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1106 ResourceMark rm; 1107 heap()->print_on(log.debug_stream()); 1108 } 1109 } 1110 1111 void Universe::initialize_verify_flags() { 1112 verify_flags = 0; 1113 const char delimiter[] = " ,"; 1114 1115 size_t length = strlen(VerifySubSet); 1116 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1117 strncpy(subset_list, VerifySubSet, length + 1); 1118 1119 char* token = strtok(subset_list, delimiter); 1120 while (token != NULL) { 1121 if (strcmp(token, "threads") == 0) { 1122 verify_flags |= Verify_Threads; 1123 } else if (strcmp(token, "heap") == 0) { 1124 verify_flags |= Verify_Heap; 1125 } else if (strcmp(token, "symbol_table") == 0) { 1126 verify_flags |= Verify_SymbolTable; 1127 } else if (strcmp(token, "string_table") == 0) { 1128 verify_flags |= Verify_StringTable; 1129 } else if (strcmp(token, "codecache") == 0) { 1130 verify_flags |= Verify_CodeCache; 1131 } else if (strcmp(token, "dictionary") == 0) { 1132 verify_flags |= Verify_SystemDictionary; 1133 } else if (strcmp(token, "classloader_data_graph") == 0) { 1134 verify_flags |= Verify_ClassLoaderDataGraph; 1135 } else if (strcmp(token, "metaspace") == 0) { 1136 verify_flags |= Verify_MetaspaceAux; 1137 } else if (strcmp(token, "jni_handles") == 0) { 1138 verify_flags |= Verify_JNIHandles; 1139 } else if (strcmp(token, "c-heap") == 0) { 1140 verify_flags |= Verify_CHeap; 1141 } else if (strcmp(token, "codecache_oops") == 0) { 1142 verify_flags |= Verify_CodeCacheOops; 1143 } else { 1144 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1145 } 1146 token = strtok(NULL, delimiter); 1147 } 1148 FREE_C_HEAP_ARRAY(char, subset_list); 1149 } 1150 1151 bool Universe::should_verify_subset(uint subset) { 1152 if (verify_flags & subset) { 1153 return true; 1154 } 1155 return false; 1156 } 1157 1158 void Universe::verify(VerifyOption option, const char* prefix) { 1159 // The use of _verify_in_progress is a temporary work around for 1160 // 6320749. Don't bother with a creating a class to set and clear 1161 // it since it is only used in this method and the control flow is 1162 // straight forward. 1163 _verify_in_progress = true; 1164 1165 COMPILER2_PRESENT( 1166 assert(!DerivedPointerTable::is_active(), 1167 "DPT should not be active during verification " 1168 "(of thread stacks below)"); 1169 ) 1170 1171 ResourceMark rm; 1172 HandleMark hm; // Handles created during verification can be zapped 1173 _verify_count++; 1174 1175 FormatBuffer<> title("Verifying %s", prefix); 1176 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1177 if (should_verify_subset(Verify_Threads)) { 1178 log_debug(gc, verify)("Threads"); 1179 Threads::verify(); 1180 } 1181 if (should_verify_subset(Verify_Heap)) { 1182 log_debug(gc, verify)("Heap"); 1183 heap()->verify(option); 1184 } 1185 if (should_verify_subset(Verify_SymbolTable)) { 1186 log_debug(gc, verify)("SymbolTable"); 1187 SymbolTable::verify(); 1188 } 1189 if (should_verify_subset(Verify_StringTable)) { 1190 log_debug(gc, verify)("StringTable"); 1191 StringTable::verify(); 1192 } 1193 if (should_verify_subset(Verify_CodeCache)) { 1194 { 1195 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1196 log_debug(gc, verify)("CodeCache"); 1197 CodeCache::verify(); 1198 } 1199 } 1200 if (should_verify_subset(Verify_SystemDictionary)) { 1201 log_debug(gc, verify)("SystemDictionary"); 1202 SystemDictionary::verify(); 1203 } 1204 #ifndef PRODUCT 1205 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1206 log_debug(gc, verify)("ClassLoaderDataGraph"); 1207 ClassLoaderDataGraph::verify(); 1208 } 1209 #endif 1210 if (should_verify_subset(Verify_MetaspaceAux)) { 1211 log_debug(gc, verify)("MetaspaceAux"); 1212 MetaspaceAux::verify_free_chunks(); 1213 } 1214 if (should_verify_subset(Verify_JNIHandles)) { 1215 log_debug(gc, verify)("JNIHandles"); 1216 JNIHandles::verify(); 1217 } 1218 if (should_verify_subset(Verify_CHeap)) { 1219 log_debug(gc, verify)("C-heap"); 1220 os::check_heap(); 1221 } 1222 if (should_verify_subset(Verify_CodeCacheOops)) { 1223 log_debug(gc, verify)("CodeCache Oops"); 1224 CodeCache::verify_oops(); 1225 } 1226 1227 _verify_in_progress = false; 1228 } 1229 1230 1231 #ifndef PRODUCT 1232 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1233 assert(low_boundary < high_boundary, "bad interval"); 1234 1235 // decide which low-order bits we require to be clear: 1236 size_t alignSize = MinObjAlignmentInBytes; 1237 size_t min_object_size = CollectedHeap::min_fill_size(); 1238 1239 // make an inclusive limit: 1240 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1241 uintptr_t min = (uintptr_t)low_boundary; 1242 assert(min < max, "bad interval"); 1243 uintptr_t diff = max ^ min; 1244 1245 // throw away enough low-order bits to make the diff vanish 1246 uintptr_t mask = (uintptr_t)(-1); 1247 while ((mask & diff) != 0) 1248 mask <<= 1; 1249 uintptr_t bits = (min & mask); 1250 assert(bits == (max & mask), "correct mask"); 1251 // check an intermediate value between min and max, just to make sure: 1252 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1253 1254 // require address alignment, too: 1255 mask |= (alignSize - 1); 1256 1257 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1258 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1259 } 1260 _verify_oop_mask = mask; 1261 _verify_oop_bits = bits; 1262 } 1263 1264 // Oop verification (see MacroAssembler::verify_oop) 1265 1266 uintptr_t Universe::verify_oop_mask() { 1267 MemRegion m = heap()->reserved_region(); 1268 calculate_verify_data(m.start(), m.end()); 1269 return _verify_oop_mask; 1270 } 1271 1272 uintptr_t Universe::verify_oop_bits() { 1273 MemRegion m = heap()->reserved_region(); 1274 calculate_verify_data(m.start(), m.end()); 1275 return _verify_oop_bits; 1276 } 1277 1278 uintptr_t Universe::verify_mark_mask() { 1279 return markOopDesc::lock_mask_in_place; 1280 } 1281 1282 uintptr_t Universe::verify_mark_bits() { 1283 intptr_t mask = verify_mark_mask(); 1284 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1285 assert((bits & ~mask) == 0, "no stray header bits"); 1286 return bits; 1287 } 1288 #endif // PRODUCT 1289 1290 1291 void Universe::compute_verify_oop_data() { 1292 verify_oop_mask(); 1293 verify_oop_bits(); 1294 verify_mark_mask(); 1295 verify_mark_bits(); 1296 } 1297 1298 1299 void LatestMethodCache::init(Klass* k, Method* m) { 1300 if (!UseSharedSpaces) { 1301 _klass = k; 1302 } 1303 #ifndef PRODUCT 1304 else { 1305 // sharing initilization should have already set up _klass 1306 assert(_klass != NULL, "just checking"); 1307 } 1308 #endif 1309 1310 _method_idnum = m->method_idnum(); 1311 assert(_method_idnum >= 0, "sanity check"); 1312 } 1313 1314 1315 Method* LatestMethodCache::get_method() { 1316 if (klass() == NULL) return NULL; 1317 InstanceKlass* ik = InstanceKlass::cast(klass()); 1318 Method* m = ik->method_with_idnum(method_idnum()); 1319 assert(m != NULL, "sanity check"); 1320 return m; 1321 } 1322 1323 1324 #ifdef ASSERT 1325 // Release dummy object(s) at bottom of heap 1326 bool Universe::release_fullgc_alot_dummy() { 1327 MutexLocker ml(FullGCALot_lock); 1328 if (_fullgc_alot_dummy_array != NULL) { 1329 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1330 // No more dummies to release, release entire array instead 1331 _fullgc_alot_dummy_array = NULL; 1332 return false; 1333 } 1334 if (!UseConcMarkSweepGC) { 1335 // Release dummy at bottom of old generation 1336 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1337 } 1338 // Release dummy at bottom of permanent generation 1339 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1340 } 1341 return true; 1342 } 1343 1344 #endif // ASSERT