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/cms/cmsCollectorPolicy.hpp" 79 #include "gc/g1/g1CollectedHeap.inline.hpp" 80 #include "gc/g1/g1CollectorPolicy.hpp" 81 #include "gc/parallel/parallelScavengeHeap.hpp" 82 #include "gc/shared/adaptiveSizePolicy.hpp" 83 #endif // INCLUDE_ALL_GCS 84 #if INCLUDE_CDS 85 #include "classfile/sharedClassUtil.hpp" 86 #endif 87 88 // Known objects 89 Klass* Universe::_boolArrayKlassObj = NULL; 90 Klass* Universe::_byteArrayKlassObj = NULL; 91 Klass* Universe::_charArrayKlassObj = NULL; 92 Klass* Universe::_intArrayKlassObj = NULL; 93 Klass* Universe::_shortArrayKlassObj = NULL; 94 Klass* Universe::_longArrayKlassObj = NULL; 95 Klass* Universe::_singleArrayKlassObj = NULL; 96 Klass* Universe::_doubleArrayKlassObj = NULL; 97 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 98 Klass* Universe::_objectArrayKlassObj = NULL; 99 oop Universe::_int_mirror = NULL; 100 oop Universe::_float_mirror = NULL; 101 oop Universe::_double_mirror = NULL; 102 oop Universe::_byte_mirror = NULL; 103 oop Universe::_bool_mirror = NULL; 104 oop Universe::_char_mirror = NULL; 105 oop Universe::_long_mirror = NULL; 106 oop Universe::_short_mirror = NULL; 107 oop Universe::_void_mirror = NULL; 108 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 109 oop Universe::_main_thread_group = NULL; 110 oop Universe::_system_thread_group = NULL; 111 objArrayOop Universe::_the_empty_class_klass_array = NULL; 112 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 113 oop Universe::_the_null_string = NULL; 114 oop Universe::_the_min_jint_string = NULL; 115 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 116 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 117 LatestMethodCache* Universe::_pd_implies_cache = NULL; 118 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 119 oop Universe::_out_of_memory_error_java_heap = NULL; 120 oop Universe::_out_of_memory_error_metaspace = NULL; 121 oop Universe::_out_of_memory_error_class_metaspace = NULL; 122 oop Universe::_out_of_memory_error_array_size = NULL; 123 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 124 oop Universe::_out_of_memory_error_realloc_objects = NULL; 125 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 126 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 127 bool Universe::_verify_in_progress = false; 128 oop Universe::_null_ptr_exception_instance = NULL; 129 oop Universe::_arithmetic_exception_instance = NULL; 130 oop Universe::_virtual_machine_error_instance = NULL; 131 oop Universe::_vm_exception = NULL; 132 oop Universe::_allocation_context_notification_obj = NULL; 133 134 Array<int>* Universe::_the_empty_int_array = NULL; 135 Array<u2>* Universe::_the_empty_short_array = NULL; 136 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 137 Array<Method*>* Universe::_the_empty_method_array = NULL; 138 139 // These variables are guarded by FullGCALot_lock. 140 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 141 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 142 143 // Heap 144 int Universe::_verify_count = 0; 145 146 int Universe::_base_vtable_size = 0; 147 bool Universe::_bootstrapping = false; 148 bool Universe::_fully_initialized = false; 149 150 size_t Universe::_heap_capacity_at_last_gc; 151 size_t Universe::_heap_used_at_last_gc = 0; 152 153 CollectedHeap* Universe::_collectedHeap = NULL; 154 155 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 156 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 157 address Universe::_narrow_ptrs_base; 158 159 void Universe::basic_type_classes_do(void f(Klass*)) { 160 f(boolArrayKlassObj()); 161 f(byteArrayKlassObj()); 162 f(charArrayKlassObj()); 163 f(intArrayKlassObj()); 164 f(shortArrayKlassObj()); 165 f(longArrayKlassObj()); 166 f(singleArrayKlassObj()); 167 f(doubleArrayKlassObj()); 168 } 169 170 void Universe::oops_do(OopClosure* f, bool do_all) { 171 172 f->do_oop((oop*) &_int_mirror); 173 f->do_oop((oop*) &_float_mirror); 174 f->do_oop((oop*) &_double_mirror); 175 f->do_oop((oop*) &_byte_mirror); 176 f->do_oop((oop*) &_bool_mirror); 177 f->do_oop((oop*) &_char_mirror); 178 f->do_oop((oop*) &_long_mirror); 179 f->do_oop((oop*) &_short_mirror); 180 f->do_oop((oop*) &_void_mirror); 181 182 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 183 f->do_oop((oop*) &_mirrors[i]); 184 } 185 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 186 187 f->do_oop((oop*)&_the_empty_class_klass_array); 188 f->do_oop((oop*)&_the_null_string); 189 f->do_oop((oop*)&_the_min_jint_string); 190 f->do_oop((oop*)&_out_of_memory_error_java_heap); 191 f->do_oop((oop*)&_out_of_memory_error_metaspace); 192 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 193 f->do_oop((oop*)&_out_of_memory_error_array_size); 194 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 195 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 196 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 197 f->do_oop((oop*)&_null_ptr_exception_instance); 198 f->do_oop((oop*)&_arithmetic_exception_instance); 199 f->do_oop((oop*)&_virtual_machine_error_instance); 200 f->do_oop((oop*)&_main_thread_group); 201 f->do_oop((oop*)&_system_thread_group); 202 f->do_oop((oop*)&_vm_exception); 203 f->do_oop((oop*)&_allocation_context_notification_obj); 204 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 205 } 206 207 // Serialize metadata in and out of CDS archive, not oops. 208 void Universe::serialize(SerializeClosure* f, bool do_all) { 209 210 f->do_ptr((void**)&_boolArrayKlassObj); 211 f->do_ptr((void**)&_byteArrayKlassObj); 212 f->do_ptr((void**)&_charArrayKlassObj); 213 f->do_ptr((void**)&_intArrayKlassObj); 214 f->do_ptr((void**)&_shortArrayKlassObj); 215 f->do_ptr((void**)&_longArrayKlassObj); 216 f->do_ptr((void**)&_singleArrayKlassObj); 217 f->do_ptr((void**)&_doubleArrayKlassObj); 218 f->do_ptr((void**)&_objectArrayKlassObj); 219 220 { 221 for (int i = 0; i < T_VOID+1; i++) { 222 if (_typeArrayKlassObjs[i] != NULL) { 223 assert(i >= T_BOOLEAN, "checking"); 224 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 225 } else if (do_all) { 226 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 227 } 228 } 229 } 230 231 f->do_ptr((void**)&_the_array_interfaces_array); 232 f->do_ptr((void**)&_the_empty_int_array); 233 f->do_ptr((void**)&_the_empty_short_array); 234 f->do_ptr((void**)&_the_empty_method_array); 235 f->do_ptr((void**)&_the_empty_klass_array); 236 _finalizer_register_cache->serialize(f); 237 _loader_addClass_cache->serialize(f); 238 _pd_implies_cache->serialize(f); 239 _throw_illegal_access_error_cache->serialize(f); 240 } 241 242 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 243 if (size < alignment || size % alignment != 0) { 244 vm_exit_during_initialization( 245 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 246 } 247 } 248 249 void initialize_basic_type_klass(Klass* k, TRAPS) { 250 Klass* ok = SystemDictionary::Object_klass(); 251 if (UseSharedSpaces) { 252 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 253 assert(k->super() == ok, "u3"); 254 k->restore_unshareable_info(loader_data, Handle(), CHECK); 255 } else { 256 k->initialize_supers(ok, CHECK); 257 } 258 k->append_to_sibling_list(); 259 } 260 261 void Universe::genesis(TRAPS) { 262 ResourceMark rm; 263 264 { FlagSetting fs(_bootstrapping, true); 265 266 { MutexLocker mc(Compile_lock); 267 268 // determine base vtable size; without that we cannot create the array klasses 269 compute_base_vtable_size(); 270 271 if (!UseSharedSpaces) { 272 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 273 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 274 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 275 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 276 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 277 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 278 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 279 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 280 281 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 282 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 283 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 284 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 285 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 286 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 287 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 288 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 289 290 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 291 292 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 293 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 294 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 295 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 296 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 297 } 298 } 299 300 vmSymbols::initialize(CHECK); 301 302 SystemDictionary::initialize(CHECK); 303 304 Klass* ok = SystemDictionary::Object_klass(); 305 306 _the_null_string = StringTable::intern("null", CHECK); 307 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 308 309 if (UseSharedSpaces) { 310 // Verify shared interfaces array. 311 assert(_the_array_interfaces_array->at(0) == 312 SystemDictionary::Cloneable_klass(), "u3"); 313 assert(_the_array_interfaces_array->at(1) == 314 SystemDictionary::Serializable_klass(), "u3"); 315 MetaspaceShared::fixup_shared_string_regions(); 316 } else { 317 // Set up shared interfaces array. (Do this before supers are set up.) 318 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 319 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 320 } 321 322 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 323 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 324 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 325 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 326 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 327 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 328 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 329 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 330 } // end of core bootstrapping 331 332 // Maybe this could be lifted up now that object array can be initialized 333 // during the bootstrapping. 334 335 // OLD 336 // Initialize _objectArrayKlass after core bootstraping to make 337 // sure the super class is set up properly for _objectArrayKlass. 338 // --- 339 // NEW 340 // Since some of the old system object arrays have been converted to 341 // ordinary object arrays, _objectArrayKlass will be loaded when 342 // SystemDictionary::initialize(CHECK); is run. See the extra check 343 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 344 _objectArrayKlassObj = InstanceKlass:: 345 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 346 // OLD 347 // Add the class to the class hierarchy manually to make sure that 348 // its vtable is initialized after core bootstrapping is completed. 349 // --- 350 // New 351 // Have already been initialized. 352 _objectArrayKlassObj->append_to_sibling_list(); 353 354 // Compute is_jdk version flags. 355 // Only 1.3 or later has the java.lang.Shutdown class. 356 // Only 1.4 or later has the java.lang.CharSequence interface. 357 // Only 1.5 or later has the java.lang.management.MemoryUsage class. 358 if (JDK_Version::is_partially_initialized()) { 359 uint8_t jdk_version; 360 Klass* k = SystemDictionary::resolve_or_null( 361 vmSymbols::java_lang_management_MemoryUsage(), THREAD); 362 CLEAR_PENDING_EXCEPTION; // ignore exceptions 363 if (k == NULL) { 364 k = SystemDictionary::resolve_or_null( 365 vmSymbols::java_lang_CharSequence(), THREAD); 366 CLEAR_PENDING_EXCEPTION; // ignore exceptions 367 if (k == NULL) { 368 k = SystemDictionary::resolve_or_null( 369 vmSymbols::java_lang_Shutdown(), THREAD); 370 CLEAR_PENDING_EXCEPTION; // ignore exceptions 371 if (k == NULL) { 372 jdk_version = 2; 373 } else { 374 jdk_version = 3; 375 } 376 } else { 377 jdk_version = 4; 378 } 379 } else { 380 jdk_version = 5; 381 } 382 JDK_Version::fully_initialize(jdk_version); 383 } 384 385 #ifdef ASSERT 386 if (FullGCALot) { 387 // Allocate an array of dummy objects. 388 // We'd like these to be at the bottom of the old generation, 389 // so that when we free one and then collect, 390 // (almost) the whole heap moves 391 // and we find out if we actually update all the oops correctly. 392 // But we can't allocate directly in the old generation, 393 // so we allocate wherever, and hope that the first collection 394 // moves these objects to the bottom of the old generation. 395 // We can allocate directly in the permanent generation, so we do. 396 int size; 397 if (UseConcMarkSweepGC) { 398 warning("Using +FullGCALot with concurrent mark sweep gc " 399 "will not force all objects to relocate"); 400 size = FullGCALotDummies; 401 } else { 402 size = FullGCALotDummies * 2; 403 } 404 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 405 objArrayHandle dummy_array(THREAD, naked_array); 406 int i = 0; 407 while (i < size) { 408 // Allocate dummy in old generation 409 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); 410 dummy_array->obj_at_put(i++, dummy); 411 } 412 { 413 // Only modify the global variable inside the mutex. 414 // If we had a race to here, the other dummy_array instances 415 // and their elements just get dropped on the floor, which is fine. 416 MutexLocker ml(FullGCALot_lock); 417 if (_fullgc_alot_dummy_array == NULL) { 418 _fullgc_alot_dummy_array = dummy_array(); 419 } 420 } 421 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 422 } 423 #endif 424 425 // Initialize dependency array for null class loader 426 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 427 428 } 429 430 // CDS support for patching vtables in metadata in the shared archive. 431 // All types inherited from Metadata have vtables, but not types inherited 432 // from MetaspaceObj, because the latter does not have virtual functions. 433 // If the metadata type has a vtable, it cannot be shared in the read-only 434 // section of the CDS archive, because the vtable pointer is patched. 435 static inline void add_vtable(void** list, int* n, void* o, int count) { 436 guarantee((*n) < count, "vtable list too small"); 437 void* vtable = dereference_vptr(o); 438 assert(*(void**)(vtable) != NULL, "invalid vtable"); 439 list[(*n)++] = vtable; 440 } 441 442 void Universe::init_self_patching_vtbl_list(void** list, int count) { 443 int n = 0; 444 { InstanceKlass o; add_vtable(list, &n, &o, count); } 445 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 446 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 447 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 448 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 449 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 450 { Method o; add_vtable(list, &n, &o, count); } 451 { ConstantPool o; add_vtable(list, &n, &o, count); } 452 } 453 454 void Universe::initialize_basic_type_mirrors(TRAPS) { 455 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 456 _int_mirror = 457 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 458 _float_mirror = 459 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 460 _double_mirror = 461 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 462 _byte_mirror = 463 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 464 _bool_mirror = 465 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 466 _char_mirror = 467 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 468 _long_mirror = 469 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 470 _short_mirror = 471 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 472 _void_mirror = 473 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 474 475 _mirrors[T_INT] = _int_mirror; 476 _mirrors[T_FLOAT] = _float_mirror; 477 _mirrors[T_DOUBLE] = _double_mirror; 478 _mirrors[T_BYTE] = _byte_mirror; 479 _mirrors[T_BOOLEAN] = _bool_mirror; 480 _mirrors[T_CHAR] = _char_mirror; 481 _mirrors[T_LONG] = _long_mirror; 482 _mirrors[T_SHORT] = _short_mirror; 483 _mirrors[T_VOID] = _void_mirror; 484 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); 485 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); 486 } 487 488 void Universe::fixup_mirrors(TRAPS) { 489 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 490 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 491 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 492 // that the number of objects allocated at this point is very small. 493 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 494 HandleMark hm(THREAD); 495 // Cache the start of the static fields 496 InstanceMirrorKlass::init_offset_of_static_fields(); 497 498 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 499 int list_length = list->length(); 500 for (int i = 0; i < list_length; i++) { 501 Klass* k = list->at(i); 502 assert(k->is_klass(), "List should only hold classes"); 503 EXCEPTION_MARK; 504 KlassHandle kh(THREAD, k); 505 java_lang_Class::fixup_mirror(kh, CATCH); 506 } 507 delete java_lang_Class::fixup_mirror_list(); 508 java_lang_Class::set_fixup_mirror_list(NULL); 509 } 510 511 static bool has_run_finalizers_on_exit = false; 512 513 void Universe::run_finalizers_on_exit() { 514 if (has_run_finalizers_on_exit) return; 515 has_run_finalizers_on_exit = true; 516 517 // Called on VM exit. This ought to be run in a separate thread. 518 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 519 { 520 PRESERVE_EXCEPTION_MARK; 521 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 522 JavaValue result(T_VOID); 523 JavaCalls::call_static( 524 &result, 525 finalizer_klass, 526 vmSymbols::run_finalizers_on_exit_name(), 527 vmSymbols::void_method_signature(), 528 THREAD 529 ); 530 // Ignore any pending exceptions 531 CLEAR_PENDING_EXCEPTION; 532 } 533 } 534 535 536 // initialize_vtable could cause gc if 537 // 1) we specified true to initialize_vtable and 538 // 2) this ran after gc was enabled 539 // In case those ever change we use handles for oops 540 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 541 // init vtable of k and all subclasses 542 Klass* ko = k_h(); 543 klassVtable* vt = ko->vtable(); 544 if (vt) vt->initialize_vtable(false, CHECK); 545 if (ko->oop_is_instance()) { 546 InstanceKlass* ik = (InstanceKlass*)ko; 547 for (KlassHandle s_h(THREAD, ik->subklass()); 548 s_h() != NULL; 549 s_h = KlassHandle(THREAD, s_h()->next_sibling())) { 550 reinitialize_vtable_of(s_h, CHECK); 551 } 552 } 553 } 554 555 556 void initialize_itable_for_klass(Klass* k, TRAPS) { 557 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 558 } 559 560 561 void Universe::reinitialize_itables(TRAPS) { 562 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 563 564 } 565 566 567 bool Universe::on_page_boundary(void* addr) { 568 return ((uintptr_t) addr) % os::vm_page_size() == 0; 569 } 570 571 572 bool Universe::should_fill_in_stack_trace(Handle throwable) { 573 // never attempt to fill in the stack trace of preallocated errors that do not have 574 // backtrace. These errors are kept alive forever and may be "re-used" when all 575 // preallocated errors with backtrace have been consumed. Also need to avoid 576 // a potential loop which could happen if an out of memory occurs when attempting 577 // to allocate the backtrace. 578 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 579 (throwable() != Universe::_out_of_memory_error_metaspace) && 580 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 581 (throwable() != Universe::_out_of_memory_error_array_size) && 582 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) && 583 (throwable() != Universe::_out_of_memory_error_realloc_objects)); 584 } 585 586 587 oop Universe::gen_out_of_memory_error(oop default_err) { 588 // generate an out of memory error: 589 // - if there is a preallocated error with backtrace available then return it wth 590 // a filled in stack trace. 591 // - if there are no preallocated errors with backtrace available then return 592 // an error without backtrace. 593 int next; 594 if (_preallocated_out_of_memory_error_avail_count > 0) { 595 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 596 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 597 } else { 598 next = -1; 599 } 600 if (next < 0) { 601 // all preallocated errors have been used. 602 // return default 603 return default_err; 604 } else { 605 // get the error object at the slot and set set it to NULL so that the 606 // array isn't keeping it alive anymore. 607 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 608 assert(exc != NULL, "slot has been used already"); 609 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 610 611 // use the message from the default error 612 oop msg = java_lang_Throwable::message(default_err); 613 assert(msg != NULL, "no message"); 614 java_lang_Throwable::set_message(exc, msg); 615 616 // populate the stack trace and return it. 617 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 618 return exc; 619 } 620 } 621 622 intptr_t Universe::_non_oop_bits = 0; 623 624 void* Universe::non_oop_word() { 625 // Neither the high bits nor the low bits of this value is allowed 626 // to look like (respectively) the high or low bits of a real oop. 627 // 628 // High and low are CPU-specific notions, but low always includes 629 // the low-order bit. Since oops are always aligned at least mod 4, 630 // setting the low-order bit will ensure that the low half of the 631 // word will never look like that of a real oop. 632 // 633 // Using the OS-supplied non-memory-address word (usually 0 or -1) 634 // will take care of the high bits, however many there are. 635 636 if (_non_oop_bits == 0) { 637 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 638 } 639 640 return (void*)_non_oop_bits; 641 } 642 643 jint universe_init() { 644 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 645 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 646 "LogHeapWordSize is incorrect."); 647 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 648 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 649 "oop size is not not a multiple of HeapWord size"); 650 TraceTime timer("Genesis", TraceStartupTime); 651 JavaClasses::compute_hard_coded_offsets(); 652 653 jint status = Universe::initialize_heap(); 654 if (status != JNI_OK) { 655 return status; 656 } 657 658 Metaspace::global_initialize(); 659 660 // Checks 'AfterMemoryInit' constraints. 661 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) { 662 return JNI_EINVAL; 663 } 664 665 // Create memory for metadata. Must be after initializing heap for 666 // DumpSharedSpaces. 667 ClassLoaderData::init_null_class_loader_data(); 668 669 // We have a heap so create the Method* caches before 670 // Metaspace::initialize_shared_spaces() tries to populate them. 671 Universe::_finalizer_register_cache = new LatestMethodCache(); 672 Universe::_loader_addClass_cache = new LatestMethodCache(); 673 Universe::_pd_implies_cache = new LatestMethodCache(); 674 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 675 676 if (UseSharedSpaces) { 677 // Read the data structures supporting the shared spaces (shared 678 // system dictionary, symbol table, etc.). After that, access to 679 // the file (other than the mapped regions) is no longer needed, and 680 // the file is closed. Closing the file does not affect the 681 // currently mapped regions. 682 MetaspaceShared::initialize_shared_spaces(); 683 StringTable::create_table(); 684 } else { 685 SymbolTable::create_table(); 686 StringTable::create_table(); 687 ClassLoader::create_package_info_table(); 688 689 if (DumpSharedSpaces) { 690 MetaspaceShared::prepare_for_dumping(); 691 } 692 } 693 694 return JNI_OK; 695 } 696 697 CollectedHeap* Universe::create_heap() { 698 assert(_collectedHeap == NULL, "Heap already created"); 699 #if !INCLUDE_ALL_GCS 700 if (UseParallelGC) { 701 fatal("UseParallelGC not supported in this VM."); 702 } else if (UseG1GC) { 703 fatal("UseG1GC not supported in this VM."); 704 } else if (UseConcMarkSweepGC) { 705 fatal("UseConcMarkSweepGC not supported in this VM."); 706 #else 707 if (UseParallelGC) { 708 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>(); 709 } else if (UseG1GC) { 710 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>(); 711 } else if (UseConcMarkSweepGC) { 712 return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>(); 713 #endif 714 } else if (UseSerialGC) { 715 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>(); 716 } 717 718 ShouldNotReachHere(); 719 return NULL; 720 } 721 722 // Choose the heap base address and oop encoding mode 723 // when compressed oops are used: 724 // Unscaled - Use 32-bits oops without encoding when 725 // NarrowOopHeapBaseMin + heap_size < 4Gb 726 // ZeroBased - Use zero based compressed oops with encoding when 727 // NarrowOopHeapBaseMin + heap_size < 32Gb 728 // HeapBased - Use compressed oops with heap base + encoding. 729 730 jint Universe::initialize_heap() { 731 jint status = JNI_ERR; 732 733 _collectedHeap = create_heap_ext(); 734 if (_collectedHeap == NULL) { 735 _collectedHeap = create_heap(); 736 } 737 738 status = _collectedHeap->initialize(); 739 if (status != JNI_OK) { 740 return status; 741 } 742 743 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 744 745 #ifdef _LP64 746 if (UseCompressedOops) { 747 // Subtract a page because something can get allocated at heap base. 748 // This also makes implicit null checking work, because the 749 // memory+1 page below heap_base needs to cause a signal. 750 // See needs_explicit_null_check. 751 // Only set the heap base for compressed oops because it indicates 752 // compressed oops for pstack code. 753 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 754 // Didn't reserve heap below 4Gb. Must shift. 755 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 756 } 757 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 758 // Did reserve heap below 32Gb. Can use base == 0; 759 Universe::set_narrow_oop_base(0); 760 } 761 762 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 763 764 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 765 Universe::print_compressed_oops_mode(tty); 766 } 767 768 // Tell tests in which mode we run. 769 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 770 narrow_oop_mode_to_string(narrow_oop_mode()), 771 false)); 772 } 773 // Universe::narrow_oop_base() is one page below the heap. 774 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 775 os::vm_page_size()) || 776 Universe::narrow_oop_base() == NULL, "invalid value"); 777 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 778 Universe::narrow_oop_shift() == 0, "invalid value"); 779 #endif 780 781 // We will never reach the CATCH below since Exceptions::_throw will cause 782 // the VM to exit if an exception is thrown during initialization 783 784 if (UseTLAB) { 785 assert(Universe::heap()->supports_tlab_allocation(), 786 "Should support thread-local allocation buffers"); 787 ThreadLocalAllocBuffer::startup_initialization(); 788 } 789 return JNI_OK; 790 } 791 792 void Universe::print_compressed_oops_mode(outputStream* st) { 793 st->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 794 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 795 796 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 797 798 if (Universe::narrow_oop_base() != 0) { 799 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 800 } 801 802 if (Universe::narrow_oop_shift() != 0) { 803 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 804 } 805 806 if (!Universe::narrow_oop_use_implicit_null_checks()) { 807 st->print(", no protected page in front of the heap"); 808 } 809 st->cr(); 810 } 811 812 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 813 814 assert(alignment <= Arguments::conservative_max_heap_alignment(), 815 err_msg("actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 816 alignment, Arguments::conservative_max_heap_alignment())); 817 818 size_t total_reserved = align_size_up(heap_size, alignment); 819 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 820 "heap size is too big for compressed oops"); 821 822 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size()); 823 assert(!UseLargePages 824 || UseParallelGC 825 || use_large_pages, "Wrong alignment to use large pages"); 826 827 // Now create the space. 828 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages); 829 830 if (total_rs.is_reserved()) { 831 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 832 "must be exactly of required size and alignment"); 833 // We are good. 834 835 if (UseCompressedOops) { 836 // Universe::initialize_heap() will reset this to NULL if unscaled 837 // or zero-based narrow oops are actually used. 838 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 839 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 840 } 841 842 return total_rs; 843 } 844 845 vm_exit_during_initialization( 846 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 847 total_reserved/K)); 848 849 // satisfy compiler 850 ShouldNotReachHere(); 851 return ReservedHeapSpace(0, 0, false); 852 } 853 854 855 // It's the caller's responsibility to ensure glitch-freedom 856 // (if required). 857 void Universe::update_heap_info_at_gc() { 858 _heap_capacity_at_last_gc = heap()->capacity(); 859 _heap_used_at_last_gc = heap()->used(); 860 } 861 862 863 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 864 switch (mode) { 865 case UnscaledNarrowOop: 866 return "32-bit"; 867 case ZeroBasedNarrowOop: 868 return "Zero based"; 869 case DisjointBaseNarrowOop: 870 return "Non-zero disjoint base"; 871 case HeapBasedNarrowOop: 872 return "Non-zero based"; 873 } 874 875 ShouldNotReachHere(); 876 return ""; 877 } 878 879 880 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 881 if (narrow_oop_base_disjoint()) { 882 return DisjointBaseNarrowOop; 883 } 884 885 if (narrow_oop_base() != 0) { 886 return HeapBasedNarrowOop; 887 } 888 889 if (narrow_oop_shift() != 0) { 890 return ZeroBasedNarrowOop; 891 } 892 893 return UnscaledNarrowOop; 894 } 895 896 897 void universe2_init() { 898 EXCEPTION_MARK; 899 Universe::genesis(CATCH); 900 } 901 902 903 bool universe_post_init() { 904 assert(!is_init_completed(), "Error: initialization not yet completed!"); 905 Universe::_fully_initialized = true; 906 EXCEPTION_MARK; 907 { ResourceMark rm; 908 Interpreter::initialize(); // needed for interpreter entry points 909 if (!UseSharedSpaces) { 910 HandleMark hm(THREAD); 911 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 912 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 913 Universe::reinitialize_itables(CHECK_false); 914 } 915 } 916 917 HandleMark hm(THREAD); 918 Klass* k; 919 instanceKlassHandle k_h; 920 // Setup preallocated empty java.lang.Class array 921 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 922 923 // Setup preallocated OutOfMemoryError errors 924 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 925 k_h = instanceKlassHandle(THREAD, k); 926 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 927 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); 928 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); 929 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 930 Universe::_out_of_memory_error_gc_overhead_limit = 931 k_h->allocate_instance(CHECK_false); 932 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false); 933 934 // Setup preallocated NullPointerException 935 // (this is currently used for a cheap & dirty solution in compiler exception handling) 936 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 937 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 938 // Setup preallocated ArithmeticException 939 // (this is currently used for a cheap & dirty solution in compiler exception handling) 940 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 941 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 942 // Virtual Machine Error for when we get into a situation we can't resolve 943 k = SystemDictionary::resolve_or_fail( 944 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 945 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 946 if (!linked) { 947 tty->print_cr("Unable to link/verify VirtualMachineError class"); 948 return false; // initialization failed 949 } 950 Universe::_virtual_machine_error_instance = 951 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 952 953 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 954 955 if (!DumpSharedSpaces) { 956 // These are the only Java fields that are currently set during shared space dumping. 957 // We prefer to not handle this generally, so we always reinitialize these detail messages. 958 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 959 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 960 961 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 962 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 963 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 964 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 965 966 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 967 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 968 969 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 970 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 971 972 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 973 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 974 975 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 976 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 977 978 // Setup the array of errors that have preallocated backtrace 979 k = Universe::_out_of_memory_error_java_heap->klass(); 980 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 981 k_h = instanceKlassHandle(THREAD, k); 982 983 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 984 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 985 for (int i=0; i<len; i++) { 986 oop err = k_h->allocate_instance(CHECK_false); 987 Handle err_h = Handle(THREAD, err); 988 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 989 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 990 } 991 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 992 } 993 994 995 // Setup static method for registering finalizers 996 // The finalizer klass must be linked before looking up the method, in 997 // case it needs to get rewritten. 998 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); 999 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( 1000 vmSymbols::register_method_name(), 1001 vmSymbols::register_method_signature()); 1002 if (m == NULL || !m->is_static()) { 1003 tty->print_cr("Unable to link/verify Finalizer.register method"); 1004 return false; // initialization failed (cannot throw exception yet) 1005 } 1006 Universe::_finalizer_register_cache->init( 1007 SystemDictionary::Finalizer_klass(), m); 1008 1009 InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->link_class(CHECK_false); 1010 m = InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->find_method( 1011 vmSymbols::throwIllegalAccessError_name(), 1012 vmSymbols::void_method_signature()); 1013 if (m != NULL && !m->is_static()) { 1014 // Note null is okay; this method is used in itables, and if it is null, 1015 // then AbstractMethodError is thrown instead. 1016 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method"); 1017 return false; // initialization failed (cannot throw exception yet) 1018 } 1019 Universe::_throw_illegal_access_error_cache->init( 1020 SystemDictionary::misc_Unsafe_klass(), m); 1021 1022 // Setup method for registering loaded classes in class loader vector 1023 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); 1024 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1025 if (m == NULL || m->is_static()) { 1026 tty->print_cr("Unable to link/verify ClassLoader.addClass method"); 1027 return false; // initialization failed (cannot throw exception yet) 1028 } 1029 Universe::_loader_addClass_cache->init( 1030 SystemDictionary::ClassLoader_klass(), m); 1031 1032 // Setup method for checking protection domain 1033 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false); 1034 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())-> 1035 find_method(vmSymbols::impliesCreateAccessControlContext_name(), 1036 vmSymbols::void_boolean_signature()); 1037 // Allow NULL which should only happen with bootstrapping. 1038 if (m != NULL) { 1039 if (m->is_static()) { 1040 // NoSuchMethodException doesn't actually work because it tries to run the 1041 // <init> function before java_lang_Class is linked. Print error and exit. 1042 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); 1043 return false; // initialization failed 1044 } 1045 Universe::_pd_implies_cache->init( 1046 SystemDictionary::ProtectionDomain_klass(), m); 1047 } 1048 1049 // This needs to be done before the first scavenge/gc, since 1050 // it's an input to soft ref clearing policy. 1051 { 1052 MutexLocker x(Heap_lock); 1053 Universe::update_heap_info_at_gc(); 1054 } 1055 1056 // ("weak") refs processing infrastructure initialization 1057 Universe::heap()->post_initialize(); 1058 1059 // Initialize performance counters for metaspaces 1060 MetaspaceCounters::initialize_performance_counters(); 1061 CompressedClassSpaceCounters::initialize_performance_counters(); 1062 1063 MemoryService::add_metaspace_memory_pools(); 1064 1065 MemoryService::set_universe_heap(Universe::heap()); 1066 #if INCLUDE_CDS 1067 SharedClassUtil::initialize(CHECK_false); 1068 #endif 1069 return true; 1070 } 1071 1072 1073 void Universe::compute_base_vtable_size() { 1074 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1075 } 1076 1077 1078 void Universe::print() { 1079 print_on(gclog_or_tty); 1080 } 1081 1082 void Universe::print_on(outputStream* st, bool extended) { 1083 st->print_cr("Heap"); 1084 if (!extended) { 1085 heap()->print_on(st); 1086 } else { 1087 heap()->print_extended_on(st); 1088 } 1089 } 1090 1091 void Universe::print_heap_at_SIGBREAK() { 1092 if (PrintHeapAtSIGBREAK) { 1093 MutexLocker hl(Heap_lock); 1094 print_on(tty); 1095 tty->cr(); 1096 tty->flush(); 1097 } 1098 } 1099 1100 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1101 st->print_cr("{Heap before GC invocations=%u (full %u):", 1102 heap()->total_collections(), 1103 heap()->total_full_collections()); 1104 if (!PrintHeapAtGCExtended || ignore_extended) { 1105 heap()->print_on(st); 1106 } else { 1107 heap()->print_extended_on(st); 1108 } 1109 } 1110 1111 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1112 st->print_cr("Heap after GC invocations=%u (full %u):", 1113 heap()->total_collections(), 1114 heap()->total_full_collections()); 1115 if (!PrintHeapAtGCExtended || ignore_extended) { 1116 heap()->print_on(st); 1117 } else { 1118 heap()->print_extended_on(st); 1119 } 1120 st->print_cr("}"); 1121 } 1122 1123 void Universe::verify(VerifyOption option, const char* prefix, bool silent) { 1124 // The use of _verify_in_progress is a temporary work around for 1125 // 6320749. Don't bother with a creating a class to set and clear 1126 // it since it is only used in this method and the control flow is 1127 // straight forward. 1128 _verify_in_progress = true; 1129 1130 COMPILER2_PRESENT( 1131 assert(!DerivedPointerTable::is_active(), 1132 "DPT should not be active during verification " 1133 "(of thread stacks below)"); 1134 ) 1135 1136 ResourceMark rm; 1137 HandleMark hm; // Handles created during verification can be zapped 1138 _verify_count++; 1139 1140 if (!silent) gclog_or_tty->print("%s", prefix); 1141 if (!silent) gclog_or_tty->print("[Verifying "); 1142 if (!silent) gclog_or_tty->print("threads "); 1143 Threads::verify(); 1144 if (!silent) gclog_or_tty->print("heap "); 1145 heap()->verify(silent, option); 1146 if (!silent) gclog_or_tty->print("syms "); 1147 SymbolTable::verify(); 1148 if (!silent) gclog_or_tty->print("strs "); 1149 StringTable::verify(); 1150 { 1151 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1152 if (!silent) gclog_or_tty->print("zone "); 1153 CodeCache::verify(); 1154 } 1155 if (!silent) gclog_or_tty->print("dict "); 1156 SystemDictionary::verify(); 1157 #ifndef PRODUCT 1158 if (!silent) gclog_or_tty->print("cldg "); 1159 ClassLoaderDataGraph::verify(); 1160 #endif 1161 if (!silent) gclog_or_tty->print("metaspace chunks "); 1162 MetaspaceAux::verify_free_chunks(); 1163 if (!silent) gclog_or_tty->print("hand "); 1164 JNIHandles::verify(); 1165 if (!silent) gclog_or_tty->print("C-heap "); 1166 os::check_heap(); 1167 if (!silent) gclog_or_tty->print("code cache "); 1168 CodeCache::verify_oops(); 1169 if (!silent) gclog_or_tty->print_cr("]"); 1170 1171 _verify_in_progress = false; 1172 } 1173 1174 // Oop verification (see MacroAssembler::verify_oop) 1175 1176 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; 1177 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; 1178 1179 1180 #ifndef PRODUCT 1181 1182 static void calculate_verify_data(uintptr_t verify_data[2], 1183 HeapWord* low_boundary, 1184 HeapWord* high_boundary) { 1185 assert(low_boundary < high_boundary, "bad interval"); 1186 1187 // decide which low-order bits we require to be clear: 1188 size_t alignSize = MinObjAlignmentInBytes; 1189 size_t min_object_size = CollectedHeap::min_fill_size(); 1190 1191 // make an inclusive limit: 1192 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1193 uintptr_t min = (uintptr_t)low_boundary; 1194 assert(min < max, "bad interval"); 1195 uintptr_t diff = max ^ min; 1196 1197 // throw away enough low-order bits to make the diff vanish 1198 uintptr_t mask = (uintptr_t)(-1); 1199 while ((mask & diff) != 0) 1200 mask <<= 1; 1201 uintptr_t bits = (min & mask); 1202 assert(bits == (max & mask), "correct mask"); 1203 // check an intermediate value between min and max, just to make sure: 1204 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1205 1206 // require address alignment, too: 1207 mask |= (alignSize - 1); 1208 1209 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { 1210 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); 1211 } 1212 verify_data[0] = mask; 1213 verify_data[1] = bits; 1214 } 1215 1216 // Oop verification (see MacroAssembler::verify_oop) 1217 1218 uintptr_t Universe::verify_oop_mask() { 1219 MemRegion m = heap()->reserved_region(); 1220 calculate_verify_data(_verify_oop_data, 1221 m.start(), 1222 m.end()); 1223 return _verify_oop_data[0]; 1224 } 1225 1226 1227 1228 uintptr_t Universe::verify_oop_bits() { 1229 verify_oop_mask(); 1230 return _verify_oop_data[1]; 1231 } 1232 1233 uintptr_t Universe::verify_mark_mask() { 1234 return markOopDesc::lock_mask_in_place; 1235 } 1236 1237 uintptr_t Universe::verify_mark_bits() { 1238 intptr_t mask = verify_mark_mask(); 1239 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1240 assert((bits & ~mask) == 0, "no stray header bits"); 1241 return bits; 1242 } 1243 #endif // PRODUCT 1244 1245 1246 void Universe::compute_verify_oop_data() { 1247 verify_oop_mask(); 1248 verify_oop_bits(); 1249 verify_mark_mask(); 1250 verify_mark_bits(); 1251 } 1252 1253 1254 void LatestMethodCache::init(Klass* k, Method* m) { 1255 if (!UseSharedSpaces) { 1256 _klass = k; 1257 } 1258 #ifndef PRODUCT 1259 else { 1260 // sharing initilization should have already set up _klass 1261 assert(_klass != NULL, "just checking"); 1262 } 1263 #endif 1264 1265 _method_idnum = m->method_idnum(); 1266 assert(_method_idnum >= 0, "sanity check"); 1267 } 1268 1269 1270 Method* LatestMethodCache::get_method() { 1271 if (klass() == NULL) return NULL; 1272 InstanceKlass* ik = InstanceKlass::cast(klass()); 1273 Method* m = ik->method_with_idnum(method_idnum()); 1274 assert(m != NULL, "sanity check"); 1275 return m; 1276 } 1277 1278 1279 #ifdef ASSERT 1280 // Release dummy object(s) at bottom of heap 1281 bool Universe::release_fullgc_alot_dummy() { 1282 MutexLocker ml(FullGCALot_lock); 1283 if (_fullgc_alot_dummy_array != NULL) { 1284 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1285 // No more dummies to release, release entire array instead 1286 _fullgc_alot_dummy_array = NULL; 1287 return false; 1288 } 1289 if (!UseConcMarkSweepGC) { 1290 // Release dummy at bottom of old generation 1291 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1292 } 1293 // Release dummy at bottom of permanent generation 1294 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1295 } 1296 return true; 1297 } 1298 1299 #endif // ASSERT