1 /* 2 * Copyright (c) 1997, 2018, 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 "aot/aotLoader.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/classLoaderData.hpp" 29 #include "classfile/javaClasses.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "classfile/vmSymbols.hpp" 33 #include "code/codeCache.hpp" 34 #include "code/dependencies.hpp" 35 #include "gc/shared/cardTableModRefBS.hpp" 36 #include "gc/shared/collectedHeap.inline.hpp" 37 #include "gc/shared/gcArguments.hpp" 38 #include "gc/shared/gcLocker.inline.hpp" 39 #include "gc/shared/generation.hpp" 40 #include "gc/shared/gcTraceTime.inline.hpp" 41 #include "gc/shared/space.hpp" 42 #include "interpreter/interpreter.hpp" 43 #include "logging/log.hpp" 44 #include "logging/logStream.hpp" 45 #include "memory/filemap.hpp" 46 #include "memory/metadataFactory.hpp" 47 #include "memory/metaspaceClosure.hpp" 48 #include "memory/metaspaceShared.hpp" 49 #include "memory/oopFactory.hpp" 50 #include "memory/resourceArea.hpp" 51 #include "memory/universe.hpp" 52 #include "memory/universe.inline.hpp" 53 #include "memory/vtBuffer.hpp" 54 #include "oops/constantPool.hpp" 55 #include "oops/instanceClassLoaderKlass.hpp" 56 #include "oops/instanceKlass.hpp" 57 #include "oops/instanceMirrorKlass.hpp" 58 #include "oops/instanceRefKlass.hpp" 59 #include "oops/objArrayOop.inline.hpp" 60 #include "oops/oop.inline.hpp" 61 #include "oops/typeArrayKlass.hpp" 62 #include "prims/resolvedMethodTable.hpp" 63 #include "runtime/arguments.hpp" 64 #include "runtime/atomic.hpp" 65 #include "runtime/commandLineFlagConstraintList.hpp" 66 #include "runtime/deoptimization.hpp" 67 #include "runtime/handles.inline.hpp" 68 #include "runtime/init.hpp" 69 #include "runtime/java.hpp" 70 #include "runtime/javaCalls.hpp" 71 #include "runtime/sharedRuntime.hpp" 72 #include "runtime/synchronizer.hpp" 73 #include "runtime/thread.inline.hpp" 74 #include "runtime/timerTrace.hpp" 75 #include "runtime/vm_operations.hpp" 76 #include "services/memoryService.hpp" 77 #include "utilities/align.hpp" 78 #include "utilities/copy.hpp" 79 #include "utilities/debug.hpp" 80 #include "utilities/events.hpp" 81 #include "utilities/formatBuffer.hpp" 82 #include "utilities/hashtable.inline.hpp" 83 #include "utilities/macros.hpp" 84 #include "utilities/ostream.hpp" 85 #include "utilities/preserveException.hpp" 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_sentinel = NULL; 116 oop Universe::_the_null_string = NULL; 117 oop Universe::_the_min_jint_string = NULL; 118 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 119 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 120 LatestMethodCache* Universe::_pd_implies_cache = NULL; 121 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 122 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 123 oop Universe::_out_of_memory_error_java_heap = NULL; 124 oop Universe::_out_of_memory_error_metaspace = NULL; 125 oop Universe::_out_of_memory_error_class_metaspace = NULL; 126 oop Universe::_out_of_memory_error_array_size = NULL; 127 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 128 oop Universe::_out_of_memory_error_realloc_objects = NULL; 129 oop Universe::_delayed_stack_overflow_error_message = NULL; 130 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 131 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 132 bool Universe::_verify_in_progress = false; 133 long Universe::verify_flags = Universe::Verify_All; 134 oop Universe::_null_ptr_exception_instance = NULL; 135 oop Universe::_arithmetic_exception_instance = NULL; 136 oop Universe::_virtual_machine_error_instance = NULL; 137 oop Universe::_vm_exception = NULL; 138 oop Universe::_reference_pending_list = NULL; 139 140 Array<int>* Universe::_the_empty_int_array = NULL; 141 Array<u2>* Universe::_the_empty_short_array = NULL; 142 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 143 Array<Method*>* Universe::_the_empty_method_array = NULL; 144 145 // These variables are guarded by FullGCALot_lock. 146 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 147 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 148 149 // Heap 150 int Universe::_verify_count = 0; 151 152 // Oop verification (see MacroAssembler::verify_oop) 153 uintptr_t Universe::_verify_oop_mask = 0; 154 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 155 156 int Universe::_base_vtable_size = 0; 157 bool Universe::_bootstrapping = false; 158 bool Universe::_module_initialized = false; 159 bool Universe::_fully_initialized = false; 160 161 size_t Universe::_heap_capacity_at_last_gc; 162 size_t Universe::_heap_used_at_last_gc = 0; 163 164 CollectedHeap* Universe::_collectedHeap = NULL; 165 166 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 167 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 168 address Universe::_narrow_ptrs_base; 169 int Universe::_oop_metadata_valuetype_mask = KlassPtrValueTypeMask; 170 171 void Universe::basic_type_classes_do(void f(Klass*)) { 172 f(boolArrayKlassObj()); 173 f(byteArrayKlassObj()); 174 f(charArrayKlassObj()); 175 f(intArrayKlassObj()); 176 f(shortArrayKlassObj()); 177 f(longArrayKlassObj()); 178 f(singleArrayKlassObj()); 179 f(doubleArrayKlassObj()); 180 } 181 182 void Universe::oops_do(OopClosure* f, bool do_all) { 183 184 f->do_oop((oop*) &_int_mirror); 185 f->do_oop((oop*) &_float_mirror); 186 f->do_oop((oop*) &_double_mirror); 187 f->do_oop((oop*) &_byte_mirror); 188 f->do_oop((oop*) &_bool_mirror); 189 f->do_oop((oop*) &_char_mirror); 190 f->do_oop((oop*) &_long_mirror); 191 f->do_oop((oop*) &_short_mirror); 192 f->do_oop((oop*) &_void_mirror); 193 194 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 195 f->do_oop((oop*) &_mirrors[i]); 196 } 197 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 198 199 f->do_oop((oop*)&_the_empty_class_klass_array); 200 f->do_oop((oop*)&_the_null_sentinel); 201 f->do_oop((oop*)&_the_null_string); 202 f->do_oop((oop*)&_the_min_jint_string); 203 f->do_oop((oop*)&_out_of_memory_error_java_heap); 204 f->do_oop((oop*)&_out_of_memory_error_metaspace); 205 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 206 f->do_oop((oop*)&_out_of_memory_error_array_size); 207 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 208 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 209 f->do_oop((oop*)&_delayed_stack_overflow_error_message); 210 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 211 f->do_oop((oop*)&_null_ptr_exception_instance); 212 f->do_oop((oop*)&_arithmetic_exception_instance); 213 f->do_oop((oop*)&_virtual_machine_error_instance); 214 f->do_oop((oop*)&_main_thread_group); 215 f->do_oop((oop*)&_system_thread_group); 216 f->do_oop((oop*)&_vm_exception); 217 f->do_oop((oop*)&_reference_pending_list); 218 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 219 } 220 221 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 222 it->push(&_klass); 223 } 224 225 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 226 it->push(&_boolArrayKlassObj); 227 it->push(&_byteArrayKlassObj); 228 it->push(&_charArrayKlassObj); 229 it->push(&_intArrayKlassObj); 230 it->push(&_shortArrayKlassObj); 231 it->push(&_longArrayKlassObj); 232 it->push(&_singleArrayKlassObj); 233 it->push(&_doubleArrayKlassObj); 234 for (int i = 0; i < T_VOID+1; i++) { 235 it->push(&_typeArrayKlassObjs[i]); 236 } 237 it->push(&_objectArrayKlassObj); 238 239 it->push(&_the_empty_int_array); 240 it->push(&_the_empty_short_array); 241 it->push(&_the_empty_klass_array); 242 it->push(&_the_empty_method_array); 243 it->push(&_the_array_interfaces_array); 244 245 _finalizer_register_cache->metaspace_pointers_do(it); 246 _loader_addClass_cache->metaspace_pointers_do(it); 247 _pd_implies_cache->metaspace_pointers_do(it); 248 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 249 _do_stack_walk_cache->metaspace_pointers_do(it); 250 } 251 252 // Serialize metadata in and out of CDS archive, not oops. 253 void Universe::serialize(SerializeClosure* f, bool do_all) { 254 255 f->do_ptr((void**)&_boolArrayKlassObj); 256 f->do_ptr((void**)&_byteArrayKlassObj); 257 f->do_ptr((void**)&_charArrayKlassObj); 258 f->do_ptr((void**)&_intArrayKlassObj); 259 f->do_ptr((void**)&_shortArrayKlassObj); 260 f->do_ptr((void**)&_longArrayKlassObj); 261 f->do_ptr((void**)&_singleArrayKlassObj); 262 f->do_ptr((void**)&_doubleArrayKlassObj); 263 f->do_ptr((void**)&_objectArrayKlassObj); 264 265 { 266 for (int i = 0; i < T_VOID+1; i++) { 267 if (_typeArrayKlassObjs[i] != NULL) { 268 assert(i >= T_BOOLEAN, "checking"); 269 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 270 } else if (do_all) { 271 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 272 } 273 } 274 } 275 276 f->do_ptr((void**)&_the_array_interfaces_array); 277 f->do_ptr((void**)&_the_empty_int_array); 278 f->do_ptr((void**)&_the_empty_short_array); 279 f->do_ptr((void**)&_the_empty_method_array); 280 f->do_ptr((void**)&_the_empty_klass_array); 281 _finalizer_register_cache->serialize(f); 282 _loader_addClass_cache->serialize(f); 283 _pd_implies_cache->serialize(f); 284 _throw_illegal_access_error_cache->serialize(f); 285 _do_stack_walk_cache->serialize(f); 286 } 287 288 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 289 if (size < alignment || size % alignment != 0) { 290 vm_exit_during_initialization( 291 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 292 } 293 } 294 295 void initialize_basic_type_klass(Klass* k, TRAPS) { 296 Klass* ok = SystemDictionary::Object_klass(); 297 #if INCLUDE_CDS 298 if (UseSharedSpaces) { 299 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 300 assert(k->super() == ok, "u3"); 301 k->restore_unshareable_info(loader_data, Handle(), CHECK); 302 } else 303 #endif 304 { 305 k->initialize_supers(ok, CHECK); 306 } 307 k->append_to_sibling_list(); 308 } 309 310 void Universe::genesis(TRAPS) { 311 ResourceMark rm; 312 313 { FlagSetting fs(_bootstrapping, true); 314 315 { MutexLocker mc(Compile_lock); 316 317 java_lang_Class::allocate_fixup_lists(); 318 319 // determine base vtable size; without that we cannot create the array klasses 320 compute_base_vtable_size(); 321 322 if (!UseSharedSpaces) { 323 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 324 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 325 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 326 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 327 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 328 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 329 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 330 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 331 332 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 333 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 334 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 335 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 336 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 337 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 338 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 339 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 340 341 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 342 343 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 344 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 345 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 346 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 347 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 348 } 349 } 350 351 vmSymbols::initialize(CHECK); 352 353 SystemDictionary::initialize(CHECK); 354 355 Klass* ok = SystemDictionary::Object_klass(); 356 357 _the_null_string = StringTable::intern("null", CHECK); 358 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 359 360 #if INCLUDE_CDS 361 if (UseSharedSpaces) { 362 // Verify shared interfaces array. 363 assert(_the_array_interfaces_array->at(0) == 364 SystemDictionary::Cloneable_klass(), "u3"); 365 assert(_the_array_interfaces_array->at(1) == 366 SystemDictionary::Serializable_klass(), "u3"); 367 MetaspaceShared::fixup_mapped_heap_regions(); 368 } else 369 #endif 370 { 371 // Set up shared interfaces array. (Do this before supers are set up.) 372 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 373 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 374 } 375 376 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 377 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 378 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 379 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 380 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 381 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 382 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 383 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 384 } // end of core bootstrapping 385 386 { 387 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 388 _the_null_sentinel = tns(); 389 } 390 391 // Maybe this could be lifted up now that object array can be initialized 392 // during the bootstrapping. 393 394 // OLD 395 // Initialize _objectArrayKlass after core bootstraping to make 396 // sure the super class is set up properly for _objectArrayKlass. 397 // --- 398 // NEW 399 // Since some of the old system object arrays have been converted to 400 // ordinary object arrays, _objectArrayKlass will be loaded when 401 // SystemDictionary::initialize(CHECK); is run. See the extra check 402 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 403 _objectArrayKlassObj = InstanceKlass:: 404 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 405 // OLD 406 // Add the class to the class hierarchy manually to make sure that 407 // its vtable is initialized after core bootstrapping is completed. 408 // --- 409 // New 410 // Have already been initialized. 411 _objectArrayKlassObj->append_to_sibling_list(); 412 413 #ifdef ASSERT 414 if (FullGCALot) { 415 // Allocate an array of dummy objects. 416 // We'd like these to be at the bottom of the old generation, 417 // so that when we free one and then collect, 418 // (almost) the whole heap moves 419 // and we find out if we actually update all the oops correctly. 420 // But we can't allocate directly in the old generation, 421 // so we allocate wherever, and hope that the first collection 422 // moves these objects to the bottom of the old generation. 423 // We can allocate directly in the permanent generation, so we do. 424 int size; 425 if (UseConcMarkSweepGC) { 426 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate"); 427 size = FullGCALotDummies; 428 } else { 429 size = FullGCALotDummies * 2; 430 } 431 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 432 objArrayHandle dummy_array(THREAD, naked_array); 433 int i = 0; 434 while (i < size) { 435 // Allocate dummy in old generation 436 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 437 dummy_array->obj_at_put(i++, dummy); 438 } 439 { 440 // Only modify the global variable inside the mutex. 441 // If we had a race to here, the other dummy_array instances 442 // and their elements just get dropped on the floor, which is fine. 443 MutexLocker ml(FullGCALot_lock); 444 if (_fullgc_alot_dummy_array == NULL) { 445 _fullgc_alot_dummy_array = dummy_array(); 446 } 447 } 448 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 449 } 450 #endif 451 452 // Initialize dependency array for null class loader 453 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 454 455 } 456 457 void Universe::initialize_basic_type_mirrors(TRAPS) { 458 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 459 _int_mirror = 460 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 461 _float_mirror = 462 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 463 _double_mirror = 464 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 465 _byte_mirror = 466 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 467 _bool_mirror = 468 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 469 _char_mirror = 470 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 471 _long_mirror = 472 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 473 _short_mirror = 474 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 475 _void_mirror = 476 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 477 478 _mirrors[T_INT] = _int_mirror; 479 _mirrors[T_FLOAT] = _float_mirror; 480 _mirrors[T_DOUBLE] = _double_mirror; 481 _mirrors[T_BYTE] = _byte_mirror; 482 _mirrors[T_BOOLEAN] = _bool_mirror; 483 _mirrors[T_CHAR] = _char_mirror; 484 _mirrors[T_LONG] = _long_mirror; 485 _mirrors[T_SHORT] = _short_mirror; 486 _mirrors[T_VOID] = _void_mirror; 487 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 488 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 489 } 490 491 void Universe::fixup_mirrors(TRAPS) { 492 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 493 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 494 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 495 // that the number of objects allocated at this point is very small. 496 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 497 HandleMark hm(THREAD); 498 // Cache the start of the static fields 499 InstanceMirrorKlass::init_offset_of_static_fields(); 500 501 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 502 int list_length = list->length(); 503 for (int i = 0; i < list_length; i++) { 504 Klass* k = list->at(i); 505 assert(k->is_klass(), "List should only hold classes"); 506 EXCEPTION_MARK; 507 java_lang_Class::fixup_mirror(k, CATCH); 508 } 509 delete java_lang_Class::fixup_mirror_list(); 510 java_lang_Class::set_fixup_mirror_list(NULL); 511 } 512 513 #define assert_pll_locked(test) \ 514 assert(Heap_lock->test(), "Reference pending list access requires lock") 515 516 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 517 518 oop Universe::reference_pending_list() { 519 if (Thread::current()->is_VM_thread()) { 520 assert_pll_locked(is_locked); 521 } else { 522 assert_pll_ownership(); 523 } 524 return _reference_pending_list; 525 } 526 527 void Universe::set_reference_pending_list(oop list) { 528 assert_pll_ownership(); 529 _reference_pending_list = list; 530 } 531 532 bool Universe::has_reference_pending_list() { 533 assert_pll_ownership(); 534 return _reference_pending_list != NULL; 535 } 536 537 oop Universe::swap_reference_pending_list(oop list) { 538 assert_pll_locked(is_locked); 539 return Atomic::xchg(list, &_reference_pending_list); 540 } 541 542 #undef assert_pll_locked 543 #undef assert_pll_ownership 544 545 // initialize_vtable could cause gc if 546 // 1) we specified true to initialize_vtable and 547 // 2) this ran after gc was enabled 548 // In case those ever change we use handles for oops 549 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) { 550 // init vtable of k and all subclasses 551 ko->vtable().initialize_vtable(false, CHECK); 552 if (ko->is_instance_klass()) { 553 for (Klass* sk = ko->subklass(); 554 sk != NULL; 555 sk = sk->next_sibling()) { 556 reinitialize_vtable_of(sk, CHECK); 557 } 558 } 559 } 560 561 562 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) { 563 k->itable().initialize_itable(false, CHECK); 564 } 565 566 567 void Universe::reinitialize_itables(TRAPS) { 568 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK); 569 } 570 571 572 bool Universe::on_page_boundary(void* addr) { 573 return is_aligned(addr, os::vm_page_size()); 574 } 575 576 577 bool Universe::should_fill_in_stack_trace(Handle throwable) { 578 // never attempt to fill in the stack trace of preallocated errors that do not have 579 // backtrace. These errors are kept alive forever and may be "re-used" when all 580 // preallocated errors with backtrace have been consumed. Also need to avoid 581 // a potential loop which could happen if an out of memory occurs when attempting 582 // to allocate the backtrace. 583 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 584 (throwable() != Universe::_out_of_memory_error_metaspace) && 585 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 586 (throwable() != Universe::_out_of_memory_error_array_size) && 587 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) && 588 (throwable() != Universe::_out_of_memory_error_realloc_objects)); 589 } 590 591 592 oop Universe::gen_out_of_memory_error(oop default_err) { 593 // generate an out of memory error: 594 // - if there is a preallocated error and stack traces are available 595 // (j.l.Throwable is initialized), then return the preallocated 596 // error with a filled in stack trace, and with the message 597 // provided by the default error. 598 // - otherwise, return the default error, without a stack trace. 599 int next; 600 if ((_preallocated_out_of_memory_error_avail_count > 0) && 601 SystemDictionary::Throwable_klass()->is_initialized()) { 602 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 603 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 604 } else { 605 next = -1; 606 } 607 if (next < 0) { 608 // all preallocated errors have been used. 609 // return default 610 return default_err; 611 } else { 612 Thread* THREAD = Thread::current(); 613 Handle default_err_h(THREAD, default_err); 614 // get the error object at the slot and set set it to NULL so that the 615 // array isn't keeping it alive anymore. 616 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next)); 617 assert(exc() != NULL, "slot has been used already"); 618 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 619 620 // use the message from the default error 621 oop msg = java_lang_Throwable::message(default_err_h()); 622 assert(msg != NULL, "no message"); 623 java_lang_Throwable::set_message(exc(), msg); 624 625 // populate the stack trace and return it. 626 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 627 return exc(); 628 } 629 } 630 631 intptr_t Universe::_non_oop_bits = 0; 632 633 void* Universe::non_oop_word() { 634 // Neither the high bits nor the low bits of this value is allowed 635 // to look like (respectively) the high or low bits of a real oop. 636 // 637 // High and low are CPU-specific notions, but low always includes 638 // the low-order bit. Since oops are always aligned at least mod 4, 639 // setting the low-order bit will ensure that the low half of the 640 // word will never look like that of a real oop. 641 // 642 // Using the OS-supplied non-memory-address word (usually 0 or -1) 643 // will take care of the high bits, however many there are. 644 645 if (_non_oop_bits == 0) { 646 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 647 } 648 649 return (void*)_non_oop_bits; 650 } 651 652 jint universe_init() { 653 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 654 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 655 "LogHeapWordSize is incorrect."); 656 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 657 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 658 "oop size is not not a multiple of HeapWord size"); 659 660 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 661 662 JavaClasses::compute_hard_coded_offsets(); 663 664 jint status = Universe::initialize_heap(); 665 if (status != JNI_OK) { 666 return status; 667 } 668 669 Metaspace::global_initialize(); 670 VTBuffer::init(); 671 // Initialize performance counters for metaspaces 672 MetaspaceCounters::initialize_performance_counters(); 673 CompressedClassSpaceCounters::initialize_performance_counters(); 674 675 AOTLoader::universe_init(); 676 677 // Checks 'AfterMemoryInit' constraints. 678 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) { 679 return JNI_EINVAL; 680 } 681 682 // Create memory for metadata. Must be after initializing heap for 683 // DumpSharedSpaces. 684 ClassLoaderData::init_null_class_loader_data(); 685 686 // We have a heap so create the Method* caches before 687 // Metaspace::initialize_shared_spaces() tries to populate them. 688 Universe::_finalizer_register_cache = new LatestMethodCache(); 689 Universe::_loader_addClass_cache = new LatestMethodCache(); 690 Universe::_pd_implies_cache = new LatestMethodCache(); 691 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 692 Universe::_do_stack_walk_cache = new LatestMethodCache(); 693 694 #if INCLUDE_CDS 695 if (UseSharedSpaces) { 696 // Read the data structures supporting the shared spaces (shared 697 // system dictionary, symbol table, etc.). After that, access to 698 // the file (other than the mapped regions) is no longer needed, and 699 // the file is closed. Closing the file does not affect the 700 // currently mapped regions. 701 MetaspaceShared::initialize_shared_spaces(); 702 StringTable::create_table(); 703 } else 704 #endif 705 { 706 SymbolTable::create_table(); 707 StringTable::create_table(); 708 709 #if INCLUDE_CDS 710 if (DumpSharedSpaces) { 711 MetaspaceShared::prepare_for_dumping(); 712 } 713 #endif 714 } 715 if (strlen(VerifySubSet) > 0) { 716 Universe::initialize_verify_flags(); 717 } 718 719 ResolvedMethodTable::create_table(); 720 721 return JNI_OK; 722 } 723 724 CollectedHeap* Universe::create_heap() { 725 assert(_collectedHeap == NULL, "Heap already created"); 726 assert(GCArguments::is_initialized(), "GC must be initialized here"); 727 return GCArguments::arguments()->create_heap(); 728 } 729 730 // Choose the heap base address and oop encoding mode 731 // when compressed oops are used: 732 // Unscaled - Use 32-bits oops without encoding when 733 // NarrowOopHeapBaseMin + heap_size < 4Gb 734 // ZeroBased - Use zero based compressed oops with encoding when 735 // NarrowOopHeapBaseMin + heap_size < 32Gb 736 // HeapBased - Use compressed oops with heap base + encoding. 737 738 jint Universe::initialize_heap() { 739 _collectedHeap = create_heap(); 740 jint status = _collectedHeap->initialize(); 741 if (status != JNI_OK) { 742 return status; 743 } 744 log_info(gc)("Using %s", _collectedHeap->name()); 745 746 GCArguments::arguments()->post_heap_initialize(); 747 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 748 749 #ifdef _LP64 750 if (UseCompressedOops) { 751 // Subtract a page because something can get allocated at heap base. 752 // This also makes implicit null checking work, because the 753 // memory+1 page below heap_base needs to cause a signal. 754 // See needs_explicit_null_check. 755 // Only set the heap base for compressed oops because it indicates 756 // compressed oops for pstack code. 757 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 758 // Didn't reserve heap below 4Gb. Must shift. 759 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 760 } 761 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 762 // Did reserve heap below 32Gb. Can use base == 0; 763 Universe::set_narrow_oop_base(0); 764 } 765 766 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 767 768 LogTarget(Info, gc, heap, coops) lt; 769 if (lt.is_enabled()) { 770 ResourceMark rm; 771 LogStream ls(lt); 772 Universe::print_compressed_oops_mode(&ls); 773 } 774 775 // Tell tests in which mode we run. 776 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 777 narrow_oop_mode_to_string(narrow_oop_mode()), 778 false)); 779 } 780 // Universe::narrow_oop_base() is one page below the heap. 781 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 782 os::vm_page_size()) || 783 Universe::narrow_oop_base() == NULL, "invalid value"); 784 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 785 Universe::narrow_oop_shift() == 0, "invalid value"); 786 #endif 787 788 // We will never reach the CATCH below since Exceptions::_throw will cause 789 // the VM to exit if an exception is thrown during initialization 790 791 if (UseTLAB) { 792 assert(Universe::heap()->supports_tlab_allocation(), 793 "Should support thread-local allocation buffers"); 794 ThreadLocalAllocBuffer::startup_initialization(); 795 } 796 return JNI_OK; 797 } 798 799 void Universe::print_compressed_oops_mode(outputStream* st) { 800 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 801 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 802 803 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 804 805 if (Universe::narrow_oop_base() != 0) { 806 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 807 } 808 809 if (Universe::narrow_oop_shift() != 0) { 810 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 811 } 812 813 if (!Universe::narrow_oop_use_implicit_null_checks()) { 814 st->print(", no protected page in front of the heap"); 815 } 816 st->cr(); 817 } 818 819 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 820 821 assert(alignment <= Arguments::conservative_max_heap_alignment(), 822 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 823 alignment, Arguments::conservative_max_heap_alignment()); 824 825 size_t total_reserved = align_up(heap_size, alignment); 826 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 827 "heap size is too big for compressed oops"); 828 829 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size()); 830 assert(!UseLargePages 831 || UseParallelGC 832 || use_large_pages, "Wrong alignment to use large pages"); 833 834 // Now create the space. 835 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt); 836 837 if (total_rs.is_reserved()) { 838 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 839 "must be exactly of required size and alignment"); 840 // We are good. 841 842 if (UseCompressedOops) { 843 // Universe::initialize_heap() will reset this to NULL if unscaled 844 // or zero-based narrow oops are actually used. 845 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 846 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 847 } 848 849 if (AllocateHeapAt != NULL) { 850 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 851 } 852 return total_rs; 853 } 854 855 vm_exit_during_initialization( 856 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 857 total_reserved/K)); 858 859 // satisfy compiler 860 ShouldNotReachHere(); 861 return ReservedHeapSpace(0, 0, false); 862 } 863 864 865 // It's the caller's responsibility to ensure glitch-freedom 866 // (if required). 867 void Universe::update_heap_info_at_gc() { 868 _heap_capacity_at_last_gc = heap()->capacity(); 869 _heap_used_at_last_gc = heap()->used(); 870 } 871 872 873 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 874 switch (mode) { 875 case UnscaledNarrowOop: 876 return "32-bit"; 877 case ZeroBasedNarrowOop: 878 return "Zero based"; 879 case DisjointBaseNarrowOop: 880 return "Non-zero disjoint base"; 881 case HeapBasedNarrowOop: 882 return "Non-zero based"; 883 default: 884 ShouldNotReachHere(); 885 return ""; 886 } 887 } 888 889 890 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 891 if (narrow_oop_base_disjoint()) { 892 return DisjointBaseNarrowOop; 893 } 894 895 if (narrow_oop_base() != 0) { 896 return HeapBasedNarrowOop; 897 } 898 899 if (narrow_oop_shift() != 0) { 900 return ZeroBasedNarrowOop; 901 } 902 903 return UnscaledNarrowOop; 904 } 905 906 void initialize_known_method(LatestMethodCache* method_cache, 907 InstanceKlass* ik, 908 const char* method, 909 Symbol* signature, 910 bool is_static, TRAPS) 911 { 912 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK); 913 Method* m = NULL; 914 // The klass must be linked before looking up the method. 915 if (!ik->link_class_or_fail(THREAD) || 916 ((m = ik->find_method(name, signature)) == NULL) || 917 is_static != m->is_static()) { 918 ResourceMark rm(THREAD); 919 // NoSuchMethodException doesn't actually work because it tries to run the 920 // <init> function before java_lang_Class is linked. Print error and exit. 921 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 922 ik->name()->as_C_string(), method)); 923 } 924 method_cache->init(ik, m); 925 } 926 927 void Universe::initialize_known_methods(TRAPS) { 928 // Set up static method for registering finalizers 929 initialize_known_method(_finalizer_register_cache, 930 SystemDictionary::Finalizer_klass(), 931 "register", 932 vmSymbols::object_void_signature(), true, CHECK); 933 934 initialize_known_method(_throw_illegal_access_error_cache, 935 SystemDictionary::internal_Unsafe_klass(), 936 "throwIllegalAccessError", 937 vmSymbols::void_method_signature(), true, CHECK); 938 939 // Set up method for registering loaded classes in class loader vector 940 initialize_known_method(_loader_addClass_cache, 941 SystemDictionary::ClassLoader_klass(), 942 "addClass", 943 vmSymbols::class_void_signature(), false, CHECK); 944 945 // Set up method for checking protection domain 946 initialize_known_method(_pd_implies_cache, 947 SystemDictionary::ProtectionDomain_klass(), 948 "impliesCreateAccessControlContext", 949 vmSymbols::void_boolean_signature(), false, CHECK); 950 951 // Set up method for stack walking 952 initialize_known_method(_do_stack_walk_cache, 953 SystemDictionary::AbstractStackWalker_klass(), 954 "doStackWalk", 955 vmSymbols::doStackWalk_signature(), false, CHECK); 956 } 957 958 void universe2_init() { 959 EXCEPTION_MARK; 960 Universe::genesis(CATCH); 961 } 962 963 // Set after initialization of the module runtime, call_initModuleRuntime 964 void universe_post_module_init() { 965 Universe::_module_initialized = true; 966 } 967 968 bool universe_post_init() { 969 assert(!is_init_completed(), "Error: initialization not yet completed!"); 970 Universe::_fully_initialized = true; 971 EXCEPTION_MARK; 972 { ResourceMark rm; 973 Interpreter::initialize(); // needed for interpreter entry points 974 if (!UseSharedSpaces) { 975 HandleMark hm(THREAD); 976 Klass* ok = SystemDictionary::Object_klass(); 977 Universe::reinitialize_vtable_of(ok, CHECK_false); 978 Universe::reinitialize_itables(CHECK_false); 979 } 980 } 981 982 HandleMark hm(THREAD); 983 // Setup preallocated empty java.lang.Class array 984 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 985 986 // Setup preallocated OutOfMemoryError errors 987 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 988 InstanceKlass* ik = InstanceKlass::cast(k); 989 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false); 990 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false); 991 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false); 992 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false); 993 Universe::_out_of_memory_error_gc_overhead_limit = 994 ik->allocate_instance(CHECK_false); 995 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false); 996 997 // Setup preallocated cause message for delayed StackOverflowError 998 if (StackReservedPages > 0) { 999 Universe::_delayed_stack_overflow_error_message = 1000 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1001 } 1002 1003 // Setup preallocated NullPointerException 1004 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1005 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1006 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1007 // Setup preallocated ArithmeticException 1008 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1009 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1010 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1011 // Virtual Machine Error for when we get into a situation we can't resolve 1012 k = SystemDictionary::resolve_or_fail( 1013 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1014 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1015 if (!linked) { 1016 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1017 return false; // initialization failed 1018 } 1019 Universe::_virtual_machine_error_instance = 1020 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1021 1022 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1023 1024 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1025 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1026 1027 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 1028 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1029 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 1030 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1031 1032 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1033 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1034 1035 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1036 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1037 1038 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 1039 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 1040 1041 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1042 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1043 1044 // Setup the array of errors that have preallocated backtrace 1045 k = Universe::_out_of_memory_error_java_heap->klass(); 1046 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1047 ik = InstanceKlass::cast(k); 1048 1049 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1050 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false); 1051 for (int i=0; i<len; i++) { 1052 oop err = ik->allocate_instance(CHECK_false); 1053 Handle err_h = Handle(THREAD, err); 1054 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1055 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1056 } 1057 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1058 1059 Universe::initialize_known_methods(CHECK_false); 1060 1061 // This needs to be done before the first scavenge/gc, since 1062 // it's an input to soft ref clearing policy. 1063 { 1064 MutexLocker x(Heap_lock); 1065 Universe::update_heap_info_at_gc(); 1066 } 1067 1068 // ("weak") refs processing infrastructure initialization 1069 Universe::heap()->post_initialize(); 1070 1071 MemoryService::add_metaspace_memory_pools(); 1072 1073 MemoryService::set_universe_heap(Universe::heap()); 1074 #if INCLUDE_CDS 1075 SharedClassUtil::initialize(CHECK_false); 1076 #endif 1077 return true; 1078 } 1079 1080 1081 void Universe::compute_base_vtable_size() { 1082 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1083 } 1084 1085 void Universe::print_on(outputStream* st) { 1086 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1087 st->print_cr("Heap"); 1088 heap()->print_on(st); 1089 } 1090 1091 void Universe::print_heap_at_SIGBREAK() { 1092 if (PrintHeapAtSIGBREAK) { 1093 print_on(tty); 1094 tty->cr(); 1095 tty->flush(); 1096 } 1097 } 1098 1099 void Universe::print_heap_before_gc() { 1100 LogTarget(Debug, gc, heap) lt; 1101 if (lt.is_enabled()) { 1102 LogStream ls(lt); 1103 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1104 ResourceMark rm; 1105 heap()->print_on(&ls); 1106 } 1107 } 1108 1109 void Universe::print_heap_after_gc() { 1110 LogTarget(Debug, gc, heap) lt; 1111 if (lt.is_enabled()) { 1112 LogStream ls(lt); 1113 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1114 ResourceMark rm; 1115 heap()->print_on(&ls); 1116 } 1117 } 1118 1119 void Universe::initialize_verify_flags() { 1120 verify_flags = 0; 1121 const char delimiter[] = " ,"; 1122 1123 size_t length = strlen(VerifySubSet); 1124 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1125 strncpy(subset_list, VerifySubSet, length + 1); 1126 1127 char* token = strtok(subset_list, delimiter); 1128 while (token != NULL) { 1129 if (strcmp(token, "threads") == 0) { 1130 verify_flags |= Verify_Threads; 1131 } else if (strcmp(token, "heap") == 0) { 1132 verify_flags |= Verify_Heap; 1133 } else if (strcmp(token, "symbol_table") == 0) { 1134 verify_flags |= Verify_SymbolTable; 1135 } else if (strcmp(token, "string_table") == 0) { 1136 verify_flags |= Verify_StringTable; 1137 } else if (strcmp(token, "codecache") == 0) { 1138 verify_flags |= Verify_CodeCache; 1139 } else if (strcmp(token, "dictionary") == 0) { 1140 verify_flags |= Verify_SystemDictionary; 1141 } else if (strcmp(token, "classloader_data_graph") == 0) { 1142 verify_flags |= Verify_ClassLoaderDataGraph; 1143 } else if (strcmp(token, "metaspace") == 0) { 1144 verify_flags |= Verify_MetaspaceAux; 1145 } else if (strcmp(token, "jni_handles") == 0) { 1146 verify_flags |= Verify_JNIHandles; 1147 } else if (strcmp(token, "codecache_oops") == 0) { 1148 verify_flags |= Verify_CodeCacheOops; 1149 } else { 1150 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1151 } 1152 token = strtok(NULL, delimiter); 1153 } 1154 FREE_C_HEAP_ARRAY(char, subset_list); 1155 } 1156 1157 bool Universe::should_verify_subset(uint subset) { 1158 if (verify_flags & subset) { 1159 return true; 1160 } 1161 return false; 1162 } 1163 1164 void Universe::verify(VerifyOption option, const char* prefix) { 1165 // The use of _verify_in_progress is a temporary work around for 1166 // 6320749. Don't bother with a creating a class to set and clear 1167 // it since it is only used in this method and the control flow is 1168 // straight forward. 1169 _verify_in_progress = true; 1170 1171 COMPILER2_PRESENT( 1172 assert(!DerivedPointerTable::is_active(), 1173 "DPT should not be active during verification " 1174 "(of thread stacks below)"); 1175 ) 1176 1177 ResourceMark rm; 1178 HandleMark hm; // Handles created during verification can be zapped 1179 _verify_count++; 1180 1181 FormatBuffer<> title("Verifying %s", prefix); 1182 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1183 if (should_verify_subset(Verify_Threads)) { 1184 log_debug(gc, verify)("Threads"); 1185 Threads::verify(); 1186 } 1187 if (should_verify_subset(Verify_Heap)) { 1188 log_debug(gc, verify)("Heap"); 1189 heap()->verify(option); 1190 } 1191 if (should_verify_subset(Verify_SymbolTable)) { 1192 log_debug(gc, verify)("SymbolTable"); 1193 SymbolTable::verify(); 1194 } 1195 if (should_verify_subset(Verify_StringTable)) { 1196 log_debug(gc, verify)("StringTable"); 1197 StringTable::verify(); 1198 } 1199 if (should_verify_subset(Verify_CodeCache)) { 1200 { 1201 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1202 log_debug(gc, verify)("CodeCache"); 1203 CodeCache::verify(); 1204 } 1205 } 1206 if (should_verify_subset(Verify_SystemDictionary)) { 1207 log_debug(gc, verify)("SystemDictionary"); 1208 SystemDictionary::verify(); 1209 } 1210 #ifndef PRODUCT 1211 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1212 log_debug(gc, verify)("ClassLoaderDataGraph"); 1213 ClassLoaderDataGraph::verify(); 1214 } 1215 #endif 1216 if (should_verify_subset(Verify_MetaspaceAux)) { 1217 log_debug(gc, verify)("MetaspaceAux"); 1218 MetaspaceAux::verify_free_chunks(); 1219 } 1220 if (should_verify_subset(Verify_JNIHandles)) { 1221 log_debug(gc, verify)("JNIHandles"); 1222 JNIHandles::verify(); 1223 } 1224 if (should_verify_subset(Verify_CodeCacheOops)) { 1225 log_debug(gc, verify)("CodeCache Oops"); 1226 CodeCache::verify_oops(); 1227 } 1228 1229 _verify_in_progress = false; 1230 } 1231 1232 1233 #ifndef PRODUCT 1234 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1235 assert(low_boundary < high_boundary, "bad interval"); 1236 1237 // decide which low-order bits we require to be clear: 1238 size_t alignSize = MinObjAlignmentInBytes; 1239 size_t min_object_size = CollectedHeap::min_fill_size(); 1240 1241 // make an inclusive limit: 1242 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1243 uintptr_t min = (uintptr_t)low_boundary; 1244 assert(min < max, "bad interval"); 1245 uintptr_t diff = max ^ min; 1246 1247 // throw away enough low-order bits to make the diff vanish 1248 uintptr_t mask = (uintptr_t)(-1); 1249 while ((mask & diff) != 0) 1250 mask <<= 1; 1251 uintptr_t bits = (min & mask); 1252 assert(bits == (max & mask), "correct mask"); 1253 // check an intermediate value between min and max, just to make sure: 1254 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1255 1256 // require address alignment, too: 1257 mask |= (alignSize - 1); 1258 1259 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1260 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1261 } 1262 _verify_oop_mask = mask; 1263 _verify_oop_bits = bits; 1264 } 1265 1266 // Oop verification (see MacroAssembler::verify_oop) 1267 1268 uintptr_t Universe::verify_oop_mask() { 1269 MemRegion m = heap()->reserved_region(); 1270 calculate_verify_data(m.start(), m.end()); 1271 return _verify_oop_mask; 1272 } 1273 1274 uintptr_t Universe::verify_oop_bits() { 1275 MemRegion m = heap()->reserved_region(); 1276 calculate_verify_data(m.start(), m.end()); 1277 return _verify_oop_bits; 1278 } 1279 1280 uintptr_t Universe::verify_mark_mask() { 1281 return markOopDesc::lock_mask_in_place; 1282 } 1283 1284 uintptr_t Universe::verify_mark_bits() { 1285 intptr_t mask = verify_mark_mask(); 1286 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1287 assert((bits & ~mask) == 0, "no stray header bits"); 1288 return bits; 1289 } 1290 #endif // PRODUCT 1291 1292 1293 void Universe::compute_verify_oop_data() { 1294 verify_oop_mask(); 1295 verify_oop_bits(); 1296 verify_mark_mask(); 1297 verify_mark_bits(); 1298 } 1299 1300 1301 void LatestMethodCache::init(Klass* k, Method* m) { 1302 if (!UseSharedSpaces) { 1303 _klass = k; 1304 } 1305 #ifndef PRODUCT 1306 else { 1307 // sharing initilization should have already set up _klass 1308 assert(_klass != NULL, "just checking"); 1309 } 1310 #endif 1311 1312 _method_idnum = m->method_idnum(); 1313 assert(_method_idnum >= 0, "sanity check"); 1314 } 1315 1316 1317 Method* LatestMethodCache::get_method() { 1318 if (klass() == NULL) return NULL; 1319 InstanceKlass* ik = InstanceKlass::cast(klass()); 1320 Method* m = ik->method_with_idnum(method_idnum()); 1321 assert(m != NULL, "sanity check"); 1322 return m; 1323 } 1324 1325 1326 #ifdef ASSERT 1327 // Release dummy object(s) at bottom of heap 1328 bool Universe::release_fullgc_alot_dummy() { 1329 MutexLocker ml(FullGCALot_lock); 1330 if (_fullgc_alot_dummy_array != NULL) { 1331 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1332 // No more dummies to release, release entire array instead 1333 _fullgc_alot_dummy_array = NULL; 1334 return false; 1335 } 1336 if (!UseConcMarkSweepGC) { 1337 // Release dummy at bottom of old generation 1338 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1339 } 1340 // Release dummy at bottom of permanent generation 1341 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1342 } 1343 return true; 1344 } 1345 1346 #endif // ASSERT