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/collectedHeap.inline.hpp" 36 #include "gc/shared/gcArguments.hpp" 37 #include "gc/shared/gcConfig.hpp" 38 #include "gc/shared/gcTraceTime.inline.hpp" 39 #include "interpreter/interpreter.hpp" 40 #include "logging/log.hpp" 41 #include "logging/logStream.hpp" 42 #include "memory/filemap.hpp" 43 #include "memory/metadataFactory.hpp" 44 #include "memory/metaspaceClosure.hpp" 45 #include "memory/metaspaceCounters.hpp" 46 #include "memory/metaspaceShared.hpp" 47 #include "memory/oopFactory.hpp" 48 #include "memory/resourceArea.hpp" 49 #include "memory/universe.hpp" 50 #include "memory/universe.hpp" 51 #include "oops/constantPool.hpp" 52 #include "oops/instanceClassLoaderKlass.hpp" 53 #include "oops/instanceKlass.hpp" 54 #include "oops/instanceMirrorKlass.hpp" 55 #include "oops/instanceRefKlass.hpp" 56 #include "oops/objArrayOop.inline.hpp" 57 #include "oops/oop.inline.hpp" 58 #include "oops/typeArrayKlass.hpp" 59 #include "prims/resolvedMethodTable.hpp" 60 #include "runtime/arguments.hpp" 61 #include "runtime/atomic.hpp" 62 #include "runtime/flags/flagSetting.hpp" 63 #include "runtime/flags/jvmFlagConstraintList.hpp" 64 #include "runtime/deoptimization.hpp" 65 #include "runtime/handles.inline.hpp" 66 #include "runtime/init.hpp" 67 #include "runtime/java.hpp" 68 #include "runtime/javaCalls.hpp" 69 #include "runtime/sharedRuntime.hpp" 70 #include "runtime/synchronizer.hpp" 71 #include "runtime/thread.inline.hpp" 72 #include "runtime/timerTrace.hpp" 73 #include "runtime/vmOperations.hpp" 74 #include "services/memoryService.hpp" 75 #include "utilities/align.hpp" 76 #include "utilities/copy.hpp" 77 #include "utilities/debug.hpp" 78 #include "utilities/events.hpp" 79 #include "utilities/formatBuffer.hpp" 80 #include "utilities/hashtable.inline.hpp" 81 #include "utilities/macros.hpp" 82 #include "utilities/ostream.hpp" 83 #include "utilities/preserveException.hpp" 84 85 // Known objects 86 Klass* Universe::_boolArrayKlassObj = NULL; 87 Klass* Universe::_byteArrayKlassObj = NULL; 88 Klass* Universe::_charArrayKlassObj = NULL; 89 Klass* Universe::_intArrayKlassObj = NULL; 90 Klass* Universe::_shortArrayKlassObj = NULL; 91 Klass* Universe::_longArrayKlassObj = NULL; 92 Klass* Universe::_singleArrayKlassObj = NULL; 93 Klass* Universe::_doubleArrayKlassObj = NULL; 94 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 95 Klass* Universe::_objectArrayKlassObj = NULL; 96 oop Universe::_int_mirror = NULL; 97 oop Universe::_float_mirror = NULL; 98 oop Universe::_double_mirror = NULL; 99 oop Universe::_byte_mirror = NULL; 100 oop Universe::_bool_mirror = NULL; 101 oop Universe::_char_mirror = NULL; 102 oop Universe::_long_mirror = NULL; 103 oop Universe::_short_mirror = NULL; 104 oop Universe::_void_mirror = NULL; 105 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 106 oop Universe::_main_thread_group = NULL; 107 oop Universe::_system_thread_group = NULL; 108 objArrayOop Universe::_the_empty_class_klass_array = NULL; 109 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 110 oop Universe::_the_null_sentinel = NULL; 111 oop Universe::_the_null_string = NULL; 112 oop Universe::_the_min_jint_string = NULL; 113 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 114 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 115 LatestMethodCache* Universe::_pd_implies_cache = NULL; 116 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 117 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL; 118 LatestMethodCache* Universe::_do_stack_walk_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 oop Universe::_delayed_stack_overflow_error_message = NULL; 126 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 127 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 128 bool Universe::_verify_in_progress = false; 129 long Universe::verify_flags = Universe::Verify_All; 130 oop Universe::_null_ptr_exception_instance = NULL; 131 oop Universe::_arithmetic_exception_instance = NULL; 132 oop Universe::_virtual_machine_error_instance = NULL; 133 oop Universe::_vm_exception = NULL; 134 oop Universe::_reference_pending_list = NULL; 135 136 Array<int>* Universe::_the_empty_int_array = NULL; 137 Array<u2>* Universe::_the_empty_short_array = NULL; 138 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 139 Array<Method*>* Universe::_the_empty_method_array = NULL; 140 141 // These variables are guarded by FullGCALot_lock. 142 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 143 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 144 145 // Heap 146 int Universe::_verify_count = 0; 147 148 // Oop verification (see MacroAssembler::verify_oop) 149 uintptr_t Universe::_verify_oop_mask = 0; 150 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 151 152 int Universe::_base_vtable_size = 0; 153 bool Universe::_bootstrapping = false; 154 bool Universe::_module_initialized = false; 155 bool Universe::_fully_initialized = false; 156 157 size_t Universe::_heap_capacity_at_last_gc; 158 size_t Universe::_heap_used_at_last_gc = 0; 159 160 CollectedHeap* Universe::_collectedHeap = NULL; 161 162 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 163 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 164 address Universe::_narrow_ptrs_base; 165 uint64_t Universe::_narrow_klass_range = (uint64_t(max_juint)+1); 166 167 void Universe::basic_type_classes_do(void f(Klass*)) { 168 f(boolArrayKlassObj()); 169 f(byteArrayKlassObj()); 170 f(charArrayKlassObj()); 171 f(intArrayKlassObj()); 172 f(shortArrayKlassObj()); 173 f(longArrayKlassObj()); 174 f(singleArrayKlassObj()); 175 f(doubleArrayKlassObj()); 176 } 177 178 void Universe::oops_do(OopClosure* f, bool do_all) { 179 180 f->do_oop((oop*) &_int_mirror); 181 f->do_oop((oop*) &_float_mirror); 182 f->do_oop((oop*) &_double_mirror); 183 f->do_oop((oop*) &_byte_mirror); 184 f->do_oop((oop*) &_bool_mirror); 185 f->do_oop((oop*) &_char_mirror); 186 f->do_oop((oop*) &_long_mirror); 187 f->do_oop((oop*) &_short_mirror); 188 f->do_oop((oop*) &_void_mirror); 189 190 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 191 f->do_oop((oop*) &_mirrors[i]); 192 } 193 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 194 195 f->do_oop((oop*)&_the_empty_class_klass_array); 196 f->do_oop((oop*)&_the_null_sentinel); 197 f->do_oop((oop*)&_the_null_string); 198 f->do_oop((oop*)&_the_min_jint_string); 199 f->do_oop((oop*)&_out_of_memory_error_java_heap); 200 f->do_oop((oop*)&_out_of_memory_error_metaspace); 201 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 202 f->do_oop((oop*)&_out_of_memory_error_array_size); 203 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 204 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 205 f->do_oop((oop*)&_delayed_stack_overflow_error_message); 206 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 207 f->do_oop((oop*)&_null_ptr_exception_instance); 208 f->do_oop((oop*)&_arithmetic_exception_instance); 209 f->do_oop((oop*)&_virtual_machine_error_instance); 210 f->do_oop((oop*)&_main_thread_group); 211 f->do_oop((oop*)&_system_thread_group); 212 f->do_oop((oop*)&_vm_exception); 213 f->do_oop((oop*)&_reference_pending_list); 214 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 215 } 216 217 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 218 it->push(&_klass); 219 } 220 221 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 222 it->push(&_boolArrayKlassObj); 223 it->push(&_byteArrayKlassObj); 224 it->push(&_charArrayKlassObj); 225 it->push(&_intArrayKlassObj); 226 it->push(&_shortArrayKlassObj); 227 it->push(&_longArrayKlassObj); 228 it->push(&_singleArrayKlassObj); 229 it->push(&_doubleArrayKlassObj); 230 for (int i = 0; i < T_VOID+1; i++) { 231 it->push(&_typeArrayKlassObjs[i]); 232 } 233 it->push(&_objectArrayKlassObj); 234 235 it->push(&_the_empty_int_array); 236 it->push(&_the_empty_short_array); 237 it->push(&_the_empty_klass_array); 238 it->push(&_the_empty_method_array); 239 it->push(&_the_array_interfaces_array); 240 241 _finalizer_register_cache->metaspace_pointers_do(it); 242 _loader_addClass_cache->metaspace_pointers_do(it); 243 _pd_implies_cache->metaspace_pointers_do(it); 244 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 245 _throw_no_such_method_error_cache->metaspace_pointers_do(it); 246 _do_stack_walk_cache->metaspace_pointers_do(it); 247 } 248 249 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive 250 void Universe::serialize(SerializeClosure* f, bool do_all) { 251 252 f->do_ptr((void**)&_boolArrayKlassObj); 253 f->do_ptr((void**)&_byteArrayKlassObj); 254 f->do_ptr((void**)&_charArrayKlassObj); 255 f->do_ptr((void**)&_intArrayKlassObj); 256 f->do_ptr((void**)&_shortArrayKlassObj); 257 f->do_ptr((void**)&_longArrayKlassObj); 258 f->do_ptr((void**)&_singleArrayKlassObj); 259 f->do_ptr((void**)&_doubleArrayKlassObj); 260 f->do_ptr((void**)&_objectArrayKlassObj); 261 262 { 263 for (int i = 0; i < T_VOID+1; i++) { 264 if (_typeArrayKlassObjs[i] != NULL) { 265 assert(i >= T_BOOLEAN, "checking"); 266 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 267 } else if (do_all) { 268 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 269 } 270 } 271 } 272 273 #if INCLUDE_CDS_JAVA_HEAP 274 // The mirrors are NULL if MetaspaceShared::is_heap_object_archiving_allowed 275 // is false. 276 f->do_oop(&_int_mirror); 277 f->do_oop(&_float_mirror); 278 f->do_oop(&_double_mirror); 279 f->do_oop(&_byte_mirror); 280 f->do_oop(&_bool_mirror); 281 f->do_oop(&_char_mirror); 282 f->do_oop(&_long_mirror); 283 f->do_oop(&_short_mirror); 284 f->do_oop(&_void_mirror); 285 #endif 286 287 f->do_ptr((void**)&_the_array_interfaces_array); 288 f->do_ptr((void**)&_the_empty_int_array); 289 f->do_ptr((void**)&_the_empty_short_array); 290 f->do_ptr((void**)&_the_empty_method_array); 291 f->do_ptr((void**)&_the_empty_klass_array); 292 _finalizer_register_cache->serialize(f); 293 _loader_addClass_cache->serialize(f); 294 _pd_implies_cache->serialize(f); 295 _throw_illegal_access_error_cache->serialize(f); 296 _throw_no_such_method_error_cache->serialize(f); 297 _do_stack_walk_cache->serialize(f); 298 } 299 300 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 301 if (size < alignment || size % alignment != 0) { 302 vm_exit_during_initialization( 303 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 304 } 305 } 306 307 void initialize_basic_type_klass(Klass* k, TRAPS) { 308 Klass* ok = SystemDictionary::Object_klass(); 309 #if INCLUDE_CDS 310 if (UseSharedSpaces) { 311 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 312 assert(k->super() == ok, "u3"); 313 k->restore_unshareable_info(loader_data, Handle(), CHECK); 314 } else 315 #endif 316 { 317 k->initialize_supers(ok, NULL, CHECK); 318 } 319 k->append_to_sibling_list(); 320 } 321 322 void Universe::genesis(TRAPS) { 323 ResourceMark rm; 324 325 { FlagSetting fs(_bootstrapping, true); 326 327 { MutexLocker mc(Compile_lock); 328 329 java_lang_Class::allocate_fixup_lists(); 330 331 // determine base vtable size; without that we cannot create the array klasses 332 compute_base_vtable_size(); 333 334 if (!UseSharedSpaces) { 335 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 336 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 337 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 338 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 339 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 340 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 341 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 342 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 343 344 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 345 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 346 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 347 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 348 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 349 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 350 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 351 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 352 353 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 354 355 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 356 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 357 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 358 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 359 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 360 } 361 } 362 363 vmSymbols::initialize(CHECK); 364 365 SystemDictionary::initialize(CHECK); 366 367 Klass* ok = SystemDictionary::Object_klass(); 368 369 _the_null_string = StringTable::intern("null", CHECK); 370 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 371 372 #if INCLUDE_CDS 373 if (UseSharedSpaces) { 374 // Verify shared interfaces array. 375 assert(_the_array_interfaces_array->at(0) == 376 SystemDictionary::Cloneable_klass(), "u3"); 377 assert(_the_array_interfaces_array->at(1) == 378 SystemDictionary::Serializable_klass(), "u3"); 379 MetaspaceShared::fixup_mapped_heap_regions(); 380 } else 381 #endif 382 { 383 // Set up shared interfaces array. (Do this before supers are set up.) 384 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 385 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 386 } 387 388 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 389 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 390 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 391 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 392 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 393 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 394 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 395 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 396 } // end of core bootstrapping 397 398 { 399 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 400 _the_null_sentinel = tns(); 401 } 402 403 // Maybe this could be lifted up now that object array can be initialized 404 // during the bootstrapping. 405 406 // OLD 407 // Initialize _objectArrayKlass after core bootstraping to make 408 // sure the super class is set up properly for _objectArrayKlass. 409 // --- 410 // NEW 411 // Since some of the old system object arrays have been converted to 412 // ordinary object arrays, _objectArrayKlass will be loaded when 413 // SystemDictionary::initialize(CHECK); is run. See the extra check 414 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 415 _objectArrayKlassObj = InstanceKlass:: 416 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 417 // OLD 418 // Add the class to the class hierarchy manually to make sure that 419 // its vtable is initialized after core bootstrapping is completed. 420 // --- 421 // New 422 // Have already been initialized. 423 _objectArrayKlassObj->append_to_sibling_list(); 424 425 #ifdef ASSERT 426 if (FullGCALot) { 427 // Allocate an array of dummy objects. 428 // We'd like these to be at the bottom of the old generation, 429 // so that when we free one and then collect, 430 // (almost) the whole heap moves 431 // and we find out if we actually update all the oops correctly. 432 // But we can't allocate directly in the old generation, 433 // so we allocate wherever, and hope that the first collection 434 // moves these objects to the bottom of the old generation. 435 // We can allocate directly in the permanent generation, so we do. 436 int size; 437 if (UseConcMarkSweepGC) { 438 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate"); 439 size = FullGCALotDummies; 440 } else { 441 size = FullGCALotDummies * 2; 442 } 443 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 444 objArrayHandle dummy_array(THREAD, naked_array); 445 int i = 0; 446 while (i < size) { 447 // Allocate dummy in old generation 448 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 449 dummy_array->obj_at_put(i++, dummy); 450 } 451 { 452 // Only modify the global variable inside the mutex. 453 // If we had a race to here, the other dummy_array instances 454 // and their elements just get dropped on the floor, which is fine. 455 MutexLocker ml(FullGCALot_lock); 456 if (_fullgc_alot_dummy_array == NULL) { 457 _fullgc_alot_dummy_array = dummy_array(); 458 } 459 } 460 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 461 } 462 #endif 463 } 464 465 void Universe::initialize_basic_type_mirrors(TRAPS) { 466 #if INCLUDE_CDS_JAVA_HEAP 467 if (UseSharedSpaces && 468 MetaspaceShared::open_archive_heap_region_mapped() && 469 _int_mirror != NULL) { 470 assert(MetaspaceShared::is_heap_object_archiving_allowed(), "Sanity"); 471 assert(_float_mirror != NULL && _double_mirror != NULL && 472 _byte_mirror != NULL && _byte_mirror != NULL && 473 _bool_mirror != NULL && _char_mirror != NULL && 474 _long_mirror != NULL && _short_mirror != NULL && 475 _void_mirror != NULL, "Sanity"); 476 } else 477 #endif 478 { 479 _int_mirror = 480 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 481 _float_mirror = 482 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 483 _double_mirror = 484 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 485 _byte_mirror = 486 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 487 _bool_mirror = 488 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 489 _char_mirror = 490 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 491 _long_mirror = 492 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 493 _short_mirror = 494 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 495 _void_mirror = 496 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 497 } 498 499 _mirrors[T_INT] = _int_mirror; 500 _mirrors[T_FLOAT] = _float_mirror; 501 _mirrors[T_DOUBLE] = _double_mirror; 502 _mirrors[T_BYTE] = _byte_mirror; 503 _mirrors[T_BOOLEAN] = _bool_mirror; 504 _mirrors[T_CHAR] = _char_mirror; 505 _mirrors[T_LONG] = _long_mirror; 506 _mirrors[T_SHORT] = _short_mirror; 507 _mirrors[T_VOID] = _void_mirror; 508 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 509 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 510 } 511 512 void Universe::fixup_mirrors(TRAPS) { 513 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 514 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 515 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 516 // that the number of objects allocated at this point is very small. 517 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 518 HandleMark hm(THREAD); 519 // Cache the start of the static fields 520 InstanceMirrorKlass::init_offset_of_static_fields(); 521 522 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 523 int list_length = list->length(); 524 for (int i = 0; i < list_length; i++) { 525 Klass* k = list->at(i); 526 assert(k->is_klass(), "List should only hold classes"); 527 EXCEPTION_MARK; 528 java_lang_Class::fixup_mirror(k, CATCH); 529 } 530 delete java_lang_Class::fixup_mirror_list(); 531 java_lang_Class::set_fixup_mirror_list(NULL); 532 } 533 534 #define assert_pll_locked(test) \ 535 assert(Heap_lock->test(), "Reference pending list access requires lock") 536 537 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 538 539 oop Universe::reference_pending_list() { 540 if (Thread::current()->is_VM_thread()) { 541 assert_pll_locked(is_locked); 542 } else { 543 assert_pll_ownership(); 544 } 545 return _reference_pending_list; 546 } 547 548 void Universe::set_reference_pending_list(oop list) { 549 assert_pll_ownership(); 550 _reference_pending_list = list; 551 } 552 553 bool Universe::has_reference_pending_list() { 554 assert_pll_ownership(); 555 return _reference_pending_list != NULL; 556 } 557 558 oop Universe::swap_reference_pending_list(oop list) { 559 assert_pll_locked(is_locked); 560 return Atomic::xchg(list, &_reference_pending_list); 561 } 562 563 #undef assert_pll_locked 564 #undef assert_pll_ownership 565 566 // initialize_vtable could cause gc if 567 // 1) we specified true to initialize_vtable and 568 // 2) this ran after gc was enabled 569 // In case those ever change we use handles for oops 570 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) { 571 // init vtable of k and all subclasses 572 ko->vtable().initialize_vtable(false, CHECK); 573 if (ko->is_instance_klass()) { 574 for (Klass* sk = ko->subklass(); 575 sk != NULL; 576 sk = sk->next_sibling()) { 577 reinitialize_vtable_of(sk, CHECK); 578 } 579 } 580 } 581 582 583 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) { 584 k->itable().initialize_itable(false, CHECK); 585 } 586 587 588 void Universe::reinitialize_itables(TRAPS) { 589 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK); 590 } 591 592 593 bool Universe::on_page_boundary(void* addr) { 594 return is_aligned(addr, os::vm_page_size()); 595 } 596 597 598 bool Universe::should_fill_in_stack_trace(Handle throwable) { 599 // never attempt to fill in the stack trace of preallocated errors that do not have 600 // backtrace. These errors are kept alive forever and may be "re-used" when all 601 // preallocated errors with backtrace have been consumed. Also need to avoid 602 // a potential loop which could happen if an out of memory occurs when attempting 603 // to allocate the backtrace. 604 return ((!oopDesc::equals(throwable(), Universe::_out_of_memory_error_java_heap)) && 605 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_metaspace)) && 606 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_class_metaspace)) && 607 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_array_size)) && 608 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_gc_overhead_limit)) && 609 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_realloc_objects))); 610 } 611 612 613 oop Universe::gen_out_of_memory_error(oop default_err) { 614 // generate an out of memory error: 615 // - if there is a preallocated error and stack traces are available 616 // (j.l.Throwable is initialized), then return the preallocated 617 // error with a filled in stack trace, and with the message 618 // provided by the default error. 619 // - otherwise, return the default error, without a stack trace. 620 int next; 621 if ((_preallocated_out_of_memory_error_avail_count > 0) && 622 SystemDictionary::Throwable_klass()->is_initialized()) { 623 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 624 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 625 } else { 626 next = -1; 627 } 628 if (next < 0) { 629 // all preallocated errors have been used. 630 // return default 631 return default_err; 632 } else { 633 Thread* THREAD = Thread::current(); 634 Handle default_err_h(THREAD, default_err); 635 // get the error object at the slot and set set it to NULL so that the 636 // array isn't keeping it alive anymore. 637 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next)); 638 assert(exc() != NULL, "slot has been used already"); 639 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 640 641 // use the message from the default error 642 oop msg = java_lang_Throwable::message(default_err_h()); 643 assert(msg != NULL, "no message"); 644 java_lang_Throwable::set_message(exc(), msg); 645 646 // populate the stack trace and return it. 647 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 648 return exc(); 649 } 650 } 651 652 intptr_t Universe::_non_oop_bits = 0; 653 654 void* Universe::non_oop_word() { 655 // Neither the high bits nor the low bits of this value is allowed 656 // to look like (respectively) the high or low bits of a real oop. 657 // 658 // High and low are CPU-specific notions, but low always includes 659 // the low-order bit. Since oops are always aligned at least mod 4, 660 // setting the low-order bit will ensure that the low half of the 661 // word will never look like that of a real oop. 662 // 663 // Using the OS-supplied non-memory-address word (usually 0 or -1) 664 // will take care of the high bits, however many there are. 665 666 if (_non_oop_bits == 0) { 667 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 668 } 669 670 return (void*)_non_oop_bits; 671 } 672 673 jint universe_init() { 674 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 675 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 676 "LogHeapWordSize is incorrect."); 677 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 678 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 679 "oop size is not not a multiple of HeapWord size"); 680 681 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 682 683 JavaClasses::compute_hard_coded_offsets(); 684 685 jint status = Universe::initialize_heap(); 686 if (status != JNI_OK) { 687 return status; 688 } 689 690 SystemDictionary::initialize_oop_storage(); 691 692 Metaspace::global_initialize(); 693 694 // Initialize performance counters for metaspaces 695 MetaspaceCounters::initialize_performance_counters(); 696 CompressedClassSpaceCounters::initialize_performance_counters(); 697 698 AOTLoader::universe_init(); 699 700 // Checks 'AfterMemoryInit' constraints. 701 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) { 702 return JNI_EINVAL; 703 } 704 705 // Create memory for metadata. Must be after initializing heap for 706 // DumpSharedSpaces. 707 ClassLoaderData::init_null_class_loader_data(); 708 709 // We have a heap so create the Method* caches before 710 // Metaspace::initialize_shared_spaces() tries to populate them. 711 Universe::_finalizer_register_cache = new LatestMethodCache(); 712 Universe::_loader_addClass_cache = new LatestMethodCache(); 713 Universe::_pd_implies_cache = new LatestMethodCache(); 714 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 715 Universe::_throw_no_such_method_error_cache = new LatestMethodCache(); 716 Universe::_do_stack_walk_cache = new LatestMethodCache(); 717 718 #if INCLUDE_CDS 719 if (UseSharedSpaces) { 720 // Read the data structures supporting the shared spaces (shared 721 // system dictionary, symbol table, etc.). After that, access to 722 // the file (other than the mapped regions) is no longer needed, and 723 // the file is closed. Closing the file does not affect the 724 // currently mapped regions. 725 MetaspaceShared::initialize_shared_spaces(); 726 StringTable::create_table(); 727 } else 728 #endif 729 { 730 SymbolTable::create_table(); 731 StringTable::create_table(); 732 733 #if INCLUDE_CDS 734 if (DumpSharedSpaces) { 735 MetaspaceShared::prepare_for_dumping(); 736 } 737 #endif 738 } 739 if (strlen(VerifySubSet) > 0) { 740 Universe::initialize_verify_flags(); 741 } 742 743 ResolvedMethodTable::create_table(); 744 745 return JNI_OK; 746 } 747 748 CollectedHeap* Universe::create_heap() { 749 assert(_collectedHeap == NULL, "Heap already created"); 750 return GCConfig::arguments()->create_heap(); 751 } 752 753 // Choose the heap base address and oop encoding mode 754 // when compressed oops are used: 755 // Unscaled - Use 32-bits oops without encoding when 756 // NarrowOopHeapBaseMin + heap_size < 4Gb 757 // ZeroBased - Use zero based compressed oops with encoding when 758 // NarrowOopHeapBaseMin + heap_size < 32Gb 759 // HeapBased - Use compressed oops with heap base + encoding. 760 761 jint Universe::initialize_heap() { 762 _collectedHeap = create_heap(); 763 jint status = _collectedHeap->initialize(); 764 if (status != JNI_OK) { 765 return status; 766 } 767 log_info(gc)("Using %s", _collectedHeap->name()); 768 769 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 770 771 #ifdef _LP64 772 if (UseCompressedOops) { 773 // Subtract a page because something can get allocated at heap base. 774 // This also makes implicit null checking work, because the 775 // memory+1 page below heap_base needs to cause a signal. 776 // See needs_explicit_null_check. 777 // Only set the heap base for compressed oops because it indicates 778 // compressed oops for pstack code. 779 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 780 // Didn't reserve heap below 4Gb. Must shift. 781 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 782 } 783 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 784 // Did reserve heap below 32Gb. Can use base == 0; 785 Universe::set_narrow_oop_base(0); 786 } 787 AOTLoader::set_narrow_oop_shift(); 788 789 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 790 791 LogTarget(Info, gc, heap, coops) lt; 792 if (lt.is_enabled()) { 793 ResourceMark rm; 794 LogStream ls(lt); 795 Universe::print_compressed_oops_mode(&ls); 796 } 797 798 // Tell tests in which mode we run. 799 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 800 narrow_oop_mode_to_string(narrow_oop_mode()), 801 false)); 802 } 803 // Universe::narrow_oop_base() is one page below the heap. 804 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 805 os::vm_page_size()) || 806 Universe::narrow_oop_base() == NULL, "invalid value"); 807 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 808 Universe::narrow_oop_shift() == 0, "invalid value"); 809 #endif 810 811 // We will never reach the CATCH below since Exceptions::_throw will cause 812 // the VM to exit if an exception is thrown during initialization 813 814 if (UseTLAB) { 815 assert(Universe::heap()->supports_tlab_allocation(), 816 "Should support thread-local allocation buffers"); 817 ThreadLocalAllocBuffer::startup_initialization(); 818 } 819 return JNI_OK; 820 } 821 822 void Universe::print_compressed_oops_mode(outputStream* st) { 823 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 824 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 825 826 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 827 828 if (Universe::narrow_oop_base() != 0) { 829 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 830 } 831 832 if (Universe::narrow_oop_shift() != 0) { 833 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 834 } 835 836 if (!Universe::narrow_oop_use_implicit_null_checks()) { 837 st->print(", no protected page in front of the heap"); 838 } 839 st->cr(); 840 } 841 842 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 843 844 assert(alignment <= Arguments::conservative_max_heap_alignment(), 845 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 846 alignment, Arguments::conservative_max_heap_alignment()); 847 848 size_t total_reserved = align_up(heap_size, alignment); 849 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 850 "heap size is too big for compressed oops"); 851 852 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size()); 853 assert(!UseLargePages 854 || UseParallelGC 855 || use_large_pages, "Wrong alignment to use large pages"); 856 857 // Now create the space. 858 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt); 859 860 if (total_rs.is_reserved()) { 861 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 862 "must be exactly of required size and alignment"); 863 // We are good. 864 865 if (UseCompressedOops) { 866 // Universe::initialize_heap() will reset this to NULL if unscaled 867 // or zero-based narrow oops are actually used. 868 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 869 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 870 } 871 872 if (AllocateHeapAt != NULL) { 873 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 874 } 875 return total_rs; 876 } 877 878 vm_exit_during_initialization( 879 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 880 total_reserved/K)); 881 882 // satisfy compiler 883 ShouldNotReachHere(); 884 return ReservedHeapSpace(0, 0, false); 885 } 886 887 888 // It's the caller's responsibility to ensure glitch-freedom 889 // (if required). 890 void Universe::update_heap_info_at_gc() { 891 _heap_capacity_at_last_gc = heap()->capacity(); 892 _heap_used_at_last_gc = heap()->used(); 893 } 894 895 896 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 897 switch (mode) { 898 case UnscaledNarrowOop: 899 return "32-bit"; 900 case ZeroBasedNarrowOop: 901 return "Zero based"; 902 case DisjointBaseNarrowOop: 903 return "Non-zero disjoint base"; 904 case HeapBasedNarrowOop: 905 return "Non-zero based"; 906 default: 907 ShouldNotReachHere(); 908 return ""; 909 } 910 } 911 912 913 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 914 if (narrow_oop_base_disjoint()) { 915 return DisjointBaseNarrowOop; 916 } 917 918 if (narrow_oop_base() != 0) { 919 return HeapBasedNarrowOop; 920 } 921 922 if (narrow_oop_shift() != 0) { 923 return ZeroBasedNarrowOop; 924 } 925 926 return UnscaledNarrowOop; 927 } 928 929 void initialize_known_method(LatestMethodCache* method_cache, 930 InstanceKlass* ik, 931 const char* method, 932 Symbol* signature, 933 bool is_static, TRAPS) 934 { 935 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK); 936 Method* m = NULL; 937 // The klass must be linked before looking up the method. 938 if (!ik->link_class_or_fail(THREAD) || 939 ((m = ik->find_method(name, signature)) == NULL) || 940 is_static != m->is_static()) { 941 ResourceMark rm(THREAD); 942 // NoSuchMethodException doesn't actually work because it tries to run the 943 // <init> function before java_lang_Class is linked. Print error and exit. 944 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 945 ik->name()->as_C_string(), method)); 946 } 947 method_cache->init(ik, m); 948 } 949 950 void Universe::initialize_known_methods(TRAPS) { 951 // Set up static method for registering finalizers 952 initialize_known_method(_finalizer_register_cache, 953 SystemDictionary::Finalizer_klass(), 954 "register", 955 vmSymbols::object_void_signature(), true, CHECK); 956 957 initialize_known_method(_throw_illegal_access_error_cache, 958 SystemDictionary::internal_Unsafe_klass(), 959 "throwIllegalAccessError", 960 vmSymbols::void_method_signature(), true, CHECK); 961 962 initialize_known_method(_throw_no_such_method_error_cache, 963 SystemDictionary::internal_Unsafe_klass(), 964 "throwNoSuchMethodError", 965 vmSymbols::void_method_signature(), true, CHECK); 966 967 // Set up method for registering loaded classes in class loader vector 968 initialize_known_method(_loader_addClass_cache, 969 SystemDictionary::ClassLoader_klass(), 970 "addClass", 971 vmSymbols::class_void_signature(), false, CHECK); 972 973 // Set up method for checking protection domain 974 initialize_known_method(_pd_implies_cache, 975 SystemDictionary::ProtectionDomain_klass(), 976 "impliesCreateAccessControlContext", 977 vmSymbols::void_boolean_signature(), false, CHECK); 978 979 // Set up method for stack walking 980 initialize_known_method(_do_stack_walk_cache, 981 SystemDictionary::AbstractStackWalker_klass(), 982 "doStackWalk", 983 vmSymbols::doStackWalk_signature(), false, CHECK); 984 } 985 986 void universe2_init() { 987 EXCEPTION_MARK; 988 Universe::genesis(CATCH); 989 } 990 991 // Set after initialization of the module runtime, call_initModuleRuntime 992 void universe_post_module_init() { 993 Universe::_module_initialized = true; 994 } 995 996 bool universe_post_init() { 997 assert(!is_init_completed(), "Error: initialization not yet completed!"); 998 Universe::_fully_initialized = true; 999 EXCEPTION_MARK; 1000 { ResourceMark rm; 1001 Interpreter::initialize(); // needed for interpreter entry points 1002 if (!UseSharedSpaces) { 1003 HandleMark hm(THREAD); 1004 Klass* ok = SystemDictionary::Object_klass(); 1005 Universe::reinitialize_vtable_of(ok, CHECK_false); 1006 Universe::reinitialize_itables(CHECK_false); 1007 } 1008 } 1009 1010 HandleMark hm(THREAD); 1011 // Setup preallocated empty java.lang.Class array 1012 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 1013 1014 // Setup preallocated OutOfMemoryError errors 1015 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 1016 InstanceKlass* ik = InstanceKlass::cast(k); 1017 Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false); 1018 Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false); 1019 Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false); 1020 Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false); 1021 Universe::_out_of_memory_error_gc_overhead_limit = 1022 ik->allocate_instance(CHECK_false); 1023 Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false); 1024 1025 // Setup preallocated cause message for delayed StackOverflowError 1026 if (StackReservedPages > 0) { 1027 Universe::_delayed_stack_overflow_error_message = 1028 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1029 } 1030 1031 // Setup preallocated NullPointerException 1032 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1033 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1034 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1035 // Setup preallocated ArithmeticException 1036 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1037 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1038 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1039 // Virtual Machine Error for when we get into a situation we can't resolve 1040 k = SystemDictionary::resolve_or_fail( 1041 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1042 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1043 if (!linked) { 1044 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1045 return false; // initialization failed 1046 } 1047 Universe::_virtual_machine_error_instance = 1048 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1049 1050 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1051 1052 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1053 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1054 1055 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 1056 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1057 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 1058 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1059 1060 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1061 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1062 1063 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1064 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1065 1066 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 1067 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 1068 1069 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1070 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1071 1072 // Setup the array of errors that have preallocated backtrace 1073 k = Universe::_out_of_memory_error_java_heap->klass(); 1074 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1075 ik = InstanceKlass::cast(k); 1076 1077 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1078 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false); 1079 for (int i=0; i<len; i++) { 1080 oop err = ik->allocate_instance(CHECK_false); 1081 Handle err_h = Handle(THREAD, err); 1082 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1083 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1084 } 1085 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1086 1087 Universe::initialize_known_methods(CHECK_false); 1088 1089 // This needs to be done before the first scavenge/gc, since 1090 // it's an input to soft ref clearing policy. 1091 { 1092 MutexLocker x(Heap_lock); 1093 Universe::update_heap_info_at_gc(); 1094 } 1095 1096 // ("weak") refs processing infrastructure initialization 1097 Universe::heap()->post_initialize(); 1098 1099 MemoryService::add_metaspace_memory_pools(); 1100 1101 MemoryService::set_universe_heap(Universe::heap()); 1102 #if INCLUDE_CDS 1103 MetaspaceShared::post_initialize(CHECK_false); 1104 #endif 1105 return true; 1106 } 1107 1108 1109 void Universe::compute_base_vtable_size() { 1110 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1111 } 1112 1113 void Universe::print_on(outputStream* st) { 1114 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1115 st->print_cr("Heap"); 1116 heap()->print_on(st); 1117 } 1118 1119 void Universe::print_heap_at_SIGBREAK() { 1120 if (PrintHeapAtSIGBREAK) { 1121 print_on(tty); 1122 tty->cr(); 1123 tty->flush(); 1124 } 1125 } 1126 1127 void Universe::print_heap_before_gc() { 1128 LogTarget(Debug, gc, heap) lt; 1129 if (lt.is_enabled()) { 1130 LogStream ls(lt); 1131 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1132 ResourceMark rm; 1133 heap()->print_on(&ls); 1134 } 1135 } 1136 1137 void Universe::print_heap_after_gc() { 1138 LogTarget(Debug, gc, heap) lt; 1139 if (lt.is_enabled()) { 1140 LogStream ls(lt); 1141 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1142 ResourceMark rm; 1143 heap()->print_on(&ls); 1144 } 1145 } 1146 1147 void Universe::initialize_verify_flags() { 1148 verify_flags = 0; 1149 const char delimiter[] = " ,"; 1150 1151 size_t length = strlen(VerifySubSet); 1152 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1153 strncpy(subset_list, VerifySubSet, length + 1); 1154 char* save_ptr; 1155 1156 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1157 while (token != NULL) { 1158 if (strcmp(token, "threads") == 0) { 1159 verify_flags |= Verify_Threads; 1160 } else if (strcmp(token, "heap") == 0) { 1161 verify_flags |= Verify_Heap; 1162 } else if (strcmp(token, "symbol_table") == 0) { 1163 verify_flags |= Verify_SymbolTable; 1164 } else if (strcmp(token, "string_table") == 0) { 1165 verify_flags |= Verify_StringTable; 1166 } else if (strcmp(token, "codecache") == 0) { 1167 verify_flags |= Verify_CodeCache; 1168 } else if (strcmp(token, "dictionary") == 0) { 1169 verify_flags |= Verify_SystemDictionary; 1170 } else if (strcmp(token, "classloader_data_graph") == 0) { 1171 verify_flags |= Verify_ClassLoaderDataGraph; 1172 } else if (strcmp(token, "metaspace") == 0) { 1173 verify_flags |= Verify_MetaspaceUtils; 1174 } else if (strcmp(token, "jni_handles") == 0) { 1175 verify_flags |= Verify_JNIHandles; 1176 } else if (strcmp(token, "codecache_oops") == 0) { 1177 verify_flags |= Verify_CodeCacheOops; 1178 } else { 1179 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1180 } 1181 token = strtok_r(NULL, delimiter, &save_ptr); 1182 } 1183 FREE_C_HEAP_ARRAY(char, subset_list); 1184 } 1185 1186 bool Universe::should_verify_subset(uint subset) { 1187 if (verify_flags & subset) { 1188 return true; 1189 } 1190 return false; 1191 } 1192 1193 void Universe::verify(VerifyOption option, const char* prefix) { 1194 // The use of _verify_in_progress is a temporary work around for 1195 // 6320749. Don't bother with a creating a class to set and clear 1196 // it since it is only used in this method and the control flow is 1197 // straight forward. 1198 _verify_in_progress = true; 1199 1200 COMPILER2_PRESENT( 1201 assert(!DerivedPointerTable::is_active(), 1202 "DPT should not be active during verification " 1203 "(of thread stacks below)"); 1204 ) 1205 1206 ResourceMark rm; 1207 HandleMark hm; // Handles created during verification can be zapped 1208 _verify_count++; 1209 1210 FormatBuffer<> title("Verifying %s", prefix); 1211 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1212 if (should_verify_subset(Verify_Threads)) { 1213 log_debug(gc, verify)("Threads"); 1214 Threads::verify(); 1215 } 1216 if (should_verify_subset(Verify_Heap)) { 1217 log_debug(gc, verify)("Heap"); 1218 heap()->verify(option); 1219 } 1220 if (should_verify_subset(Verify_SymbolTable)) { 1221 log_debug(gc, verify)("SymbolTable"); 1222 SymbolTable::verify(); 1223 } 1224 if (should_verify_subset(Verify_StringTable)) { 1225 log_debug(gc, verify)("StringTable"); 1226 StringTable::verify(); 1227 } 1228 if (should_verify_subset(Verify_CodeCache)) { 1229 { 1230 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1231 log_debug(gc, verify)("CodeCache"); 1232 CodeCache::verify(); 1233 } 1234 } 1235 if (should_verify_subset(Verify_SystemDictionary)) { 1236 log_debug(gc, verify)("SystemDictionary"); 1237 SystemDictionary::verify(); 1238 } 1239 #ifndef PRODUCT 1240 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1241 log_debug(gc, verify)("ClassLoaderDataGraph"); 1242 ClassLoaderDataGraph::verify(); 1243 } 1244 #endif 1245 if (should_verify_subset(Verify_MetaspaceUtils)) { 1246 log_debug(gc, verify)("MetaspaceUtils"); 1247 MetaspaceUtils::verify_free_chunks(); 1248 } 1249 if (should_verify_subset(Verify_JNIHandles)) { 1250 log_debug(gc, verify)("JNIHandles"); 1251 JNIHandles::verify(); 1252 } 1253 if (should_verify_subset(Verify_CodeCacheOops)) { 1254 log_debug(gc, verify)("CodeCache Oops"); 1255 CodeCache::verify_oops(); 1256 } 1257 1258 _verify_in_progress = false; 1259 } 1260 1261 1262 #ifndef PRODUCT 1263 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1264 assert(low_boundary < high_boundary, "bad interval"); 1265 1266 // decide which low-order bits we require to be clear: 1267 size_t alignSize = MinObjAlignmentInBytes; 1268 size_t min_object_size = CollectedHeap::min_fill_size(); 1269 1270 // make an inclusive limit: 1271 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1272 uintptr_t min = (uintptr_t)low_boundary; 1273 assert(min < max, "bad interval"); 1274 uintptr_t diff = max ^ min; 1275 1276 // throw away enough low-order bits to make the diff vanish 1277 uintptr_t mask = (uintptr_t)(-1); 1278 while ((mask & diff) != 0) 1279 mask <<= 1; 1280 uintptr_t bits = (min & mask); 1281 assert(bits == (max & mask), "correct mask"); 1282 // check an intermediate value between min and max, just to make sure: 1283 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1284 1285 // require address alignment, too: 1286 mask |= (alignSize - 1); 1287 1288 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1289 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1290 } 1291 _verify_oop_mask = mask; 1292 _verify_oop_bits = bits; 1293 } 1294 1295 // Oop verification (see MacroAssembler::verify_oop) 1296 1297 uintptr_t Universe::verify_oop_mask() { 1298 MemRegion m = heap()->reserved_region(); 1299 calculate_verify_data(m.start(), m.end()); 1300 return _verify_oop_mask; 1301 } 1302 1303 uintptr_t Universe::verify_oop_bits() { 1304 MemRegion m = heap()->reserved_region(); 1305 calculate_verify_data(m.start(), m.end()); 1306 return _verify_oop_bits; 1307 } 1308 1309 uintptr_t Universe::verify_mark_mask() { 1310 return markOopDesc::lock_mask_in_place; 1311 } 1312 1313 uintptr_t Universe::verify_mark_bits() { 1314 intptr_t mask = verify_mark_mask(); 1315 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1316 assert((bits & ~mask) == 0, "no stray header bits"); 1317 return bits; 1318 } 1319 #endif // PRODUCT 1320 1321 1322 void Universe::compute_verify_oop_data() { 1323 verify_oop_mask(); 1324 verify_oop_bits(); 1325 verify_mark_mask(); 1326 verify_mark_bits(); 1327 } 1328 1329 1330 void LatestMethodCache::init(Klass* k, Method* m) { 1331 if (!UseSharedSpaces) { 1332 _klass = k; 1333 } 1334 #ifndef PRODUCT 1335 else { 1336 // sharing initilization should have already set up _klass 1337 assert(_klass != NULL, "just checking"); 1338 } 1339 #endif 1340 1341 _method_idnum = m->method_idnum(); 1342 assert(_method_idnum >= 0, "sanity check"); 1343 } 1344 1345 1346 Method* LatestMethodCache::get_method() { 1347 if (klass() == NULL) return NULL; 1348 InstanceKlass* ik = InstanceKlass::cast(klass()); 1349 Method* m = ik->method_with_idnum(method_idnum()); 1350 assert(m != NULL, "sanity check"); 1351 return m; 1352 } 1353 1354 1355 #ifdef ASSERT 1356 // Release dummy object(s) at bottom of heap 1357 bool Universe::release_fullgc_alot_dummy() { 1358 MutexLocker ml(FullGCALot_lock); 1359 if (_fullgc_alot_dummy_array != NULL) { 1360 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1361 // No more dummies to release, release entire array instead 1362 _fullgc_alot_dummy_array = NULL; 1363 return false; 1364 } 1365 if (!UseConcMarkSweepGC) { 1366 // Release dummy at bottom of old generation 1367 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1368 } 1369 // Release dummy at bottom of permanent generation 1370 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1371 } 1372 return true; 1373 } 1374 1375 #endif // ASSERT