1 /* 2 * Copyright (c) 1997, 2019, 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/classLoaderDataGraph.hpp" 29 #include "classfile/javaClasses.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "classfile/vmSymbols.hpp" 33 #include "code/codeBehaviours.hpp" 34 #include "code/codeCache.hpp" 35 #include "code/dependencies.hpp" 36 #include "gc/shared/collectedHeap.inline.hpp" 37 #include "gc/shared/gcArguments.hpp" 38 #include "gc/shared/gcConfig.hpp" 39 #include "gc/shared/gcTraceTime.inline.hpp" 40 #include "interpreter/interpreter.hpp" 41 #include "logging/log.hpp" 42 #include "logging/logStream.hpp" 43 #include "memory/heapShared.hpp" 44 #include "memory/filemap.hpp" 45 #include "memory/metadataFactory.hpp" 46 #include "memory/metaspaceClosure.hpp" 47 #include "memory/metaspaceCounters.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.hpp" 53 #include "oops/constantPool.hpp" 54 #include "oops/instanceClassLoaderKlass.hpp" 55 #include "oops/instanceKlass.hpp" 56 #include "oops/instanceMirrorKlass.hpp" 57 #include "oops/instanceRefKlass.hpp" 58 #include "oops/objArrayOop.inline.hpp" 59 #include "oops/oop.inline.hpp" 60 #include "oops/typeArrayKlass.hpp" 61 #include "prims/resolvedMethodTable.hpp" 62 #include "runtime/arguments.hpp" 63 #include "runtime/atomic.hpp" 64 #include "runtime/deoptimization.hpp" 65 #include "runtime/flags/flagSetting.hpp" 66 #include "runtime/flags/jvmFlagConstraintList.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/vmOperations.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 87 // Known objects 88 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ }; 89 Klass* Universe::_objectArrayKlassObj = NULL; 90 oop Universe::_int_mirror = NULL; 91 oop Universe::_float_mirror = NULL; 92 oop Universe::_double_mirror = NULL; 93 oop Universe::_byte_mirror = NULL; 94 oop Universe::_bool_mirror = NULL; 95 oop Universe::_char_mirror = NULL; 96 oop Universe::_long_mirror = NULL; 97 oop Universe::_short_mirror = NULL; 98 oop Universe::_void_mirror = NULL; 99 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 100 oop Universe::_main_thread_group = NULL; 101 oop Universe::_system_thread_group = NULL; 102 objArrayOop Universe::_the_empty_class_klass_array = NULL; 103 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 104 oop Universe::_the_null_sentinel = NULL; 105 oop Universe::_the_null_string = NULL; 106 oop Universe::_the_min_jint_string = NULL; 107 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 108 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 109 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 110 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL; 111 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 112 oop Universe::_out_of_memory_error_java_heap = NULL; 113 oop Universe::_out_of_memory_error_metaspace = NULL; 114 oop Universe::_out_of_memory_error_class_metaspace = NULL; 115 oop Universe::_out_of_memory_error_array_size = NULL; 116 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 117 oop Universe::_out_of_memory_error_realloc_objects = NULL; 118 oop Universe::_out_of_memory_error_retry = NULL; 119 oop Universe::_delayed_stack_overflow_error_message = NULL; 120 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 121 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 122 bool Universe::_verify_in_progress = false; 123 long Universe::verify_flags = Universe::Verify_All; 124 oop Universe::_null_ptr_exception_instance = NULL; 125 oop Universe::_arithmetic_exception_instance = NULL; 126 oop Universe::_virtual_machine_error_instance = NULL; 127 oop Universe::_vm_exception = NULL; 128 oop Universe::_reference_pending_list = NULL; 129 130 Array<int>* Universe::_the_empty_int_array = NULL; 131 Array<u2>* Universe::_the_empty_short_array = NULL; 132 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 133 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL; 134 Array<Method*>* Universe::_the_empty_method_array = NULL; 135 136 // These variables are guarded by FullGCALot_lock. 137 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 138 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 139 140 // Heap 141 int Universe::_verify_count = 0; 142 143 // Oop verification (see MacroAssembler::verify_oop) 144 uintptr_t Universe::_verify_oop_mask = 0; 145 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 146 147 int Universe::_base_vtable_size = 0; 148 bool Universe::_bootstrapping = false; 149 bool Universe::_module_initialized = false; 150 bool Universe::_fully_initialized = false; 151 152 size_t Universe::_heap_capacity_at_last_gc; 153 size_t Universe::_heap_used_at_last_gc = 0; 154 155 CollectedHeap* Universe::_collectedHeap = NULL; 156 157 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 158 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 159 address Universe::_narrow_ptrs_base; 160 uint64_t Universe::_narrow_klass_range = (uint64_t(max_juint)+1); 161 162 void Universe::basic_type_classes_do(void f(Klass*)) { 163 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 164 f(_typeArrayKlassObjs[i]); 165 } 166 } 167 168 void Universe::basic_type_classes_do(KlassClosure *closure) { 169 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 170 closure->do_klass(_typeArrayKlassObjs[i]); 171 } 172 } 173 174 void Universe::oops_do(OopClosure* f) { 175 176 f->do_oop((oop*) &_int_mirror); 177 f->do_oop((oop*) &_float_mirror); 178 f->do_oop((oop*) &_double_mirror); 179 f->do_oop((oop*) &_byte_mirror); 180 f->do_oop((oop*) &_bool_mirror); 181 f->do_oop((oop*) &_char_mirror); 182 f->do_oop((oop*) &_long_mirror); 183 f->do_oop((oop*) &_short_mirror); 184 f->do_oop((oop*) &_void_mirror); 185 186 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 187 f->do_oop((oop*) &_mirrors[i]); 188 } 189 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 190 191 f->do_oop((oop*)&_the_empty_class_klass_array); 192 f->do_oop((oop*)&_the_null_sentinel); 193 f->do_oop((oop*)&_the_null_string); 194 f->do_oop((oop*)&_the_min_jint_string); 195 f->do_oop((oop*)&_out_of_memory_error_java_heap); 196 f->do_oop((oop*)&_out_of_memory_error_metaspace); 197 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 198 f->do_oop((oop*)&_out_of_memory_error_array_size); 199 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 200 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 201 f->do_oop((oop*)&_out_of_memory_error_retry); 202 f->do_oop((oop*)&_delayed_stack_overflow_error_message); 203 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 204 f->do_oop((oop*)&_null_ptr_exception_instance); 205 f->do_oop((oop*)&_arithmetic_exception_instance); 206 f->do_oop((oop*)&_virtual_machine_error_instance); 207 f->do_oop((oop*)&_main_thread_group); 208 f->do_oop((oop*)&_system_thread_group); 209 f->do_oop((oop*)&_vm_exception); 210 f->do_oop((oop*)&_reference_pending_list); 211 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 212 } 213 214 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 215 it->push(&_klass); 216 } 217 218 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 219 for (int i = 0; i < T_LONG+1; i++) { 220 it->push(&_typeArrayKlassObjs[i]); 221 } 222 it->push(&_objectArrayKlassObj); 223 224 it->push(&_the_empty_int_array); 225 it->push(&_the_empty_short_array); 226 it->push(&_the_empty_klass_array); 227 it->push(&_the_empty_instance_klass_array); 228 it->push(&_the_empty_method_array); 229 it->push(&_the_array_interfaces_array); 230 231 _finalizer_register_cache->metaspace_pointers_do(it); 232 _loader_addClass_cache->metaspace_pointers_do(it); 233 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 234 _throw_no_such_method_error_cache->metaspace_pointers_do(it); 235 _do_stack_walk_cache->metaspace_pointers_do(it); 236 } 237 238 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive 239 void Universe::serialize(SerializeClosure* f) { 240 241 for (int i = 0; i < T_LONG+1; i++) { 242 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 243 } 244 245 f->do_ptr((void**)&_objectArrayKlassObj); 246 #if INCLUDE_CDS_JAVA_HEAP 247 #ifdef ASSERT 248 if (DumpSharedSpaces && !HeapShared::is_heap_object_archiving_allowed()) { 249 assert(_int_mirror == NULL && _float_mirror == NULL && 250 _double_mirror == NULL && _byte_mirror == NULL && 251 _bool_mirror == NULL && _char_mirror == NULL && 252 _long_mirror == NULL && _short_mirror == NULL && 253 _void_mirror == NULL, "mirrors should be NULL"); 254 } 255 #endif 256 f->do_oop(&_int_mirror); 257 f->do_oop(&_float_mirror); 258 f->do_oop(&_double_mirror); 259 f->do_oop(&_byte_mirror); 260 f->do_oop(&_bool_mirror); 261 f->do_oop(&_char_mirror); 262 f->do_oop(&_long_mirror); 263 f->do_oop(&_short_mirror); 264 f->do_oop(&_void_mirror); 265 #endif 266 267 f->do_ptr((void**)&_the_array_interfaces_array); 268 f->do_ptr((void**)&_the_empty_int_array); 269 f->do_ptr((void**)&_the_empty_short_array); 270 f->do_ptr((void**)&_the_empty_method_array); 271 f->do_ptr((void**)&_the_empty_klass_array); 272 f->do_ptr((void**)&_the_empty_instance_klass_array); 273 _finalizer_register_cache->serialize(f); 274 _loader_addClass_cache->serialize(f); 275 _throw_illegal_access_error_cache->serialize(f); 276 _throw_no_such_method_error_cache->serialize(f); 277 _do_stack_walk_cache->serialize(f); 278 } 279 280 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 281 if (size < alignment || size % alignment != 0) { 282 vm_exit_during_initialization( 283 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 284 } 285 } 286 287 void initialize_basic_type_klass(Klass* k, TRAPS) { 288 Klass* ok = SystemDictionary::Object_klass(); 289 #if INCLUDE_CDS 290 if (UseSharedSpaces) { 291 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 292 assert(k->super() == ok, "u3"); 293 k->restore_unshareable_info(loader_data, Handle(), CHECK); 294 } else 295 #endif 296 { 297 k->initialize_supers(ok, NULL, CHECK); 298 } 299 k->append_to_sibling_list(); 300 } 301 302 void Universe::genesis(TRAPS) { 303 ResourceMark rm; 304 305 { FlagSetting fs(_bootstrapping, true); 306 307 { MutexLocker mc(Compile_lock); 308 309 java_lang_Class::allocate_fixup_lists(); 310 311 // determine base vtable size; without that we cannot create the array klasses 312 compute_base_vtable_size(); 313 314 if (!UseSharedSpaces) { 315 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 316 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 317 } 318 319 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 320 321 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 322 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 323 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 324 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 325 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 326 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 327 } 328 } 329 330 vmSymbols::initialize(CHECK); 331 332 SystemDictionary::initialize(CHECK); 333 334 Klass* ok = SystemDictionary::Object_klass(); 335 336 _the_null_string = StringTable::intern("null", CHECK); 337 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 338 339 #if INCLUDE_CDS 340 if (UseSharedSpaces) { 341 // Verify shared interfaces array. 342 assert(_the_array_interfaces_array->at(0) == 343 SystemDictionary::Cloneable_klass(), "u3"); 344 assert(_the_array_interfaces_array->at(1) == 345 SystemDictionary::Serializable_klass(), "u3"); 346 } else 347 #endif 348 { 349 // Set up shared interfaces array. (Do this before supers are set up.) 350 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 351 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 352 } 353 354 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 355 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 356 initialize_basic_type_klass(floatArrayKlassObj(), CHECK); 357 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 358 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 359 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 360 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 361 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 362 } // end of core bootstrapping 363 364 { 365 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 366 _the_null_sentinel = tns(); 367 } 368 369 // Maybe this could be lifted up now that object array can be initialized 370 // during the bootstrapping. 371 372 // OLD 373 // Initialize _objectArrayKlass after core bootstraping to make 374 // sure the super class is set up properly for _objectArrayKlass. 375 // --- 376 // NEW 377 // Since some of the old system object arrays have been converted to 378 // ordinary object arrays, _objectArrayKlass will be loaded when 379 // SystemDictionary::initialize(CHECK); is run. See the extra check 380 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 381 _objectArrayKlassObj = InstanceKlass:: 382 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 383 // OLD 384 // Add the class to the class hierarchy manually to make sure that 385 // its vtable is initialized after core bootstrapping is completed. 386 // --- 387 // New 388 // Have already been initialized. 389 _objectArrayKlassObj->append_to_sibling_list(); 390 391 #ifdef ASSERT 392 if (FullGCALot) { 393 // Allocate an array of dummy objects. 394 // We'd like these to be at the bottom of the old generation, 395 // so that when we free one and then collect, 396 // (almost) the whole heap moves 397 // and we find out if we actually update all the oops correctly. 398 // But we can't allocate directly in the old generation, 399 // so we allocate wherever, and hope that the first collection 400 // moves these objects to the bottom of the old generation. 401 // We can allocate directly in the permanent generation, so we do. 402 int size; 403 if (UseConcMarkSweepGC) { 404 log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate"); 405 size = FullGCALotDummies; 406 } else { 407 size = FullGCALotDummies * 2; 408 } 409 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 410 objArrayHandle dummy_array(THREAD, naked_array); 411 int i = 0; 412 while (i < size) { 413 // Allocate dummy in old generation 414 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 415 dummy_array->obj_at_put(i++, dummy); 416 } 417 { 418 // Only modify the global variable inside the mutex. 419 // If we had a race to here, the other dummy_array instances 420 // and their elements just get dropped on the floor, which is fine. 421 MutexLocker ml(FullGCALot_lock); 422 if (_fullgc_alot_dummy_array == NULL) { 423 _fullgc_alot_dummy_array = dummy_array(); 424 } 425 } 426 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 427 } 428 #endif 429 } 430 431 void Universe::initialize_basic_type_mirrors(TRAPS) { 432 #if INCLUDE_CDS_JAVA_HEAP 433 if (UseSharedSpaces && 434 HeapShared::open_archive_heap_region_mapped() && 435 _int_mirror != NULL) { 436 assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity"); 437 assert(_float_mirror != NULL && _double_mirror != NULL && 438 _byte_mirror != NULL && _byte_mirror != NULL && 439 _bool_mirror != NULL && _char_mirror != NULL && 440 _long_mirror != NULL && _short_mirror != NULL && 441 _void_mirror != NULL, "Sanity"); 442 } else 443 #endif 444 { 445 _int_mirror = 446 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 447 _float_mirror = 448 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 449 _double_mirror = 450 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 451 _byte_mirror = 452 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 453 _bool_mirror = 454 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 455 _char_mirror = 456 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 457 _long_mirror = 458 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 459 _short_mirror = 460 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 461 _void_mirror = 462 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 463 } 464 465 _mirrors[T_INT] = _int_mirror; 466 _mirrors[T_FLOAT] = _float_mirror; 467 _mirrors[T_DOUBLE] = _double_mirror; 468 _mirrors[T_BYTE] = _byte_mirror; 469 _mirrors[T_BOOLEAN] = _bool_mirror; 470 _mirrors[T_CHAR] = _char_mirror; 471 _mirrors[T_LONG] = _long_mirror; 472 _mirrors[T_SHORT] = _short_mirror; 473 _mirrors[T_VOID] = _void_mirror; 474 //_mirrors[T_OBJECT] = _object_klass->java_mirror(); 475 //_mirrors[T_ARRAY] = _object_klass->java_mirror(); 476 } 477 478 void Universe::fixup_mirrors(TRAPS) { 479 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 480 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 481 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 482 // that the number of objects allocated at this point is very small. 483 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 484 HandleMark hm(THREAD); 485 486 if (!UseSharedSpaces) { 487 // Cache the start of the static fields 488 InstanceMirrorKlass::init_offset_of_static_fields(); 489 } 490 491 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 492 int list_length = list->length(); 493 for (int i = 0; i < list_length; i++) { 494 Klass* k = list->at(i); 495 assert(k->is_klass(), "List should only hold classes"); 496 EXCEPTION_MARK; 497 java_lang_Class::fixup_mirror(k, CATCH); 498 } 499 delete java_lang_Class::fixup_mirror_list(); 500 java_lang_Class::set_fixup_mirror_list(NULL); 501 } 502 503 #define assert_pll_locked(test) \ 504 assert(Heap_lock->test(), "Reference pending list access requires lock") 505 506 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 507 508 oop Universe::reference_pending_list() { 509 if (Thread::current()->is_VM_thread()) { 510 assert_pll_locked(is_locked); 511 } else { 512 assert_pll_ownership(); 513 } 514 return _reference_pending_list; 515 } 516 517 void Universe::set_reference_pending_list(oop list) { 518 assert_pll_ownership(); 519 _reference_pending_list = list; 520 } 521 522 bool Universe::has_reference_pending_list() { 523 assert_pll_ownership(); 524 return _reference_pending_list != NULL; 525 } 526 527 oop Universe::swap_reference_pending_list(oop list) { 528 assert_pll_locked(is_locked); 529 return Atomic::xchg(list, &_reference_pending_list); 530 } 531 532 #undef assert_pll_locked 533 #undef assert_pll_ownership 534 535 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) { 536 // init vtable of k and all subclasses 537 ko->vtable().initialize_vtable(false, CHECK); 538 if (ko->is_instance_klass()) { 539 for (Klass* sk = ko->subklass(); 540 sk != NULL; 541 sk = sk->next_sibling()) { 542 reinitialize_vtable_of(sk, CHECK); 543 } 544 } 545 } 546 547 void Universe::reinitialize_vtables(TRAPS) { 548 // The vtables are initialized by starting at java.lang.Object and 549 // initializing through the subclass links, so that the super 550 // classes are always initialized first. 551 Klass* ok = SystemDictionary::Object_klass(); 552 Universe::reinitialize_vtable_of(ok, THREAD); 553 } 554 555 556 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) { 557 k->itable().initialize_itable(false, CHECK); 558 } 559 560 561 void Universe::reinitialize_itables(TRAPS) { 562 MutexLocker mcld(ClassLoaderDataGraph_lock); 563 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK); 564 } 565 566 567 bool Universe::on_page_boundary(void* addr) { 568 return is_aligned(addr, os::vm_page_size()); 569 } 570 571 572 bool Universe::should_fill_in_stack_trace(Handle throwable) { 573 // never attempt to fill in the stack trace of preallocated errors that do not have 574 // backtrace. These errors are kept alive forever and may be "re-used" when all 575 // preallocated errors with backtrace have been consumed. Also need to avoid 576 // a potential loop which could happen if an out of memory occurs when attempting 577 // to allocate the backtrace. 578 return ((!oopDesc::equals(throwable(), Universe::_out_of_memory_error_java_heap)) && 579 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_metaspace)) && 580 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_class_metaspace)) && 581 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_array_size)) && 582 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_gc_overhead_limit)) && 583 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_realloc_objects)) && 584 (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_retry))); 585 } 586 587 588 oop Universe::gen_out_of_memory_error(oop default_err) { 589 // generate an out of memory error: 590 // - if there is a preallocated error and stack traces are available 591 // (j.l.Throwable is initialized), then return the preallocated 592 // error with a filled in stack trace, and with the message 593 // provided by the default error. 594 // - otherwise, return the default error, without a stack trace. 595 int next; 596 if ((_preallocated_out_of_memory_error_avail_count > 0) && 597 SystemDictionary::Throwable_klass()->is_initialized()) { 598 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 599 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 600 } else { 601 next = -1; 602 } 603 if (next < 0) { 604 // all preallocated errors have been used. 605 // return default 606 return default_err; 607 } else { 608 Thread* THREAD = Thread::current(); 609 Handle default_err_h(THREAD, default_err); 610 // get the error object at the slot and set set it to NULL so that the 611 // array isn't keeping it alive anymore. 612 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next)); 613 assert(exc() != NULL, "slot has been used already"); 614 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 615 616 // use the message from the default error 617 oop msg = java_lang_Throwable::message(default_err_h()); 618 assert(msg != NULL, "no message"); 619 java_lang_Throwable::set_message(exc(), msg); 620 621 // populate the stack trace and return it. 622 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 623 return exc(); 624 } 625 } 626 627 intptr_t Universe::_non_oop_bits = 0; 628 629 void* Universe::non_oop_word() { 630 // Neither the high bits nor the low bits of this value is allowed 631 // to look like (respectively) the high or low bits of a real oop. 632 // 633 // High and low are CPU-specific notions, but low always includes 634 // the low-order bit. Since oops are always aligned at least mod 4, 635 // setting the low-order bit will ensure that the low half of the 636 // word will never look like that of a real oop. 637 // 638 // Using the OS-supplied non-memory-address word (usually 0 or -1) 639 // will take care of the high bits, however many there are. 640 641 if (_non_oop_bits == 0) { 642 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 643 } 644 645 return (void*)_non_oop_bits; 646 } 647 648 static void initialize_global_behaviours() { 649 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour()); 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 initialize_global_behaviours(); 665 666 jint status = Universe::initialize_heap(); 667 if (status != JNI_OK) { 668 return status; 669 } 670 671 SystemDictionary::initialize_oop_storage(); 672 673 Metaspace::global_initialize(); 674 675 // Initialize performance counters for metaspaces 676 MetaspaceCounters::initialize_performance_counters(); 677 CompressedClassSpaceCounters::initialize_performance_counters(); 678 679 AOTLoader::universe_init(); 680 681 // Checks 'AfterMemoryInit' constraints. 682 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) { 683 return JNI_EINVAL; 684 } 685 686 // Create memory for metadata. Must be after initializing heap for 687 // DumpSharedSpaces. 688 ClassLoaderData::init_null_class_loader_data(); 689 690 // We have a heap so create the Method* caches before 691 // Metaspace::initialize_shared_spaces() tries to populate them. 692 Universe::_finalizer_register_cache = new LatestMethodCache(); 693 Universe::_loader_addClass_cache = new LatestMethodCache(); 694 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 695 Universe::_throw_no_such_method_error_cache = new LatestMethodCache(); 696 Universe::_do_stack_walk_cache = new LatestMethodCache(); 697 698 #if INCLUDE_CDS 699 if (UseSharedSpaces) { 700 // Read the data structures supporting the shared spaces (shared 701 // system dictionary, symbol table, etc.). After that, access to 702 // the file (other than the mapped regions) is no longer needed, and 703 // the file is closed. Closing the file does not affect the 704 // currently mapped regions. 705 MetaspaceShared::initialize_shared_spaces(); 706 StringTable::create_table(); 707 } else 708 #endif 709 { 710 SymbolTable::create_table(); 711 StringTable::create_table(); 712 713 #if INCLUDE_CDS 714 if (DumpSharedSpaces) { 715 MetaspaceShared::prepare_for_dumping(); 716 } 717 #endif 718 } 719 if (strlen(VerifySubSet) > 0) { 720 Universe::initialize_verify_flags(); 721 } 722 723 ResolvedMethodTable::create_table(); 724 725 return JNI_OK; 726 } 727 728 CollectedHeap* Universe::create_heap() { 729 assert(_collectedHeap == NULL, "Heap already created"); 730 return GCConfig::arguments()->create_heap(); 731 } 732 733 // Choose the heap base address and oop encoding mode 734 // when compressed oops are used: 735 // Unscaled - Use 32-bits oops without encoding when 736 // NarrowOopHeapBaseMin + heap_size < 4Gb 737 // ZeroBased - Use zero based compressed oops with encoding when 738 // NarrowOopHeapBaseMin + heap_size < 32Gb 739 // HeapBased - Use compressed oops with heap base + encoding. 740 741 jint Universe::initialize_heap() { 742 _collectedHeap = create_heap(); 743 jint status = _collectedHeap->initialize(); 744 if (status != JNI_OK) { 745 return status; 746 } 747 log_info(gc)("Using %s", _collectedHeap->name()); 748 749 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 750 751 #ifdef _LP64 752 if (UseCompressedOops) { 753 // Subtract a page because something can get allocated at heap base. 754 // This also makes implicit null checking work, because the 755 // memory+1 page below heap_base needs to cause a signal. 756 // See needs_explicit_null_check. 757 // Only set the heap base for compressed oops because it indicates 758 // compressed oops for pstack code. 759 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 760 // Didn't reserve heap below 4Gb. Must shift. 761 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 762 } 763 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 764 // Did reserve heap below 32Gb. Can use base == 0; 765 Universe::set_narrow_oop_base(0); 766 } 767 AOTLoader::set_narrow_oop_shift(); 768 769 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 770 771 LogTarget(Info, gc, heap, coops) lt; 772 if (lt.is_enabled()) { 773 ResourceMark rm; 774 LogStream ls(lt); 775 Universe::print_compressed_oops_mode(&ls); 776 } 777 778 // Tell tests in which mode we run. 779 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 780 narrow_oop_mode_to_string(narrow_oop_mode()), 781 false)); 782 } 783 // Universe::narrow_oop_base() is one page below the heap. 784 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 785 os::vm_page_size()) || 786 Universe::narrow_oop_base() == NULL, "invalid value"); 787 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 788 Universe::narrow_oop_shift() == 0, "invalid value"); 789 #endif 790 791 // We will never reach the CATCH below since Exceptions::_throw will cause 792 // the VM to exit if an exception is thrown during initialization 793 794 if (UseTLAB) { 795 assert(Universe::heap()->supports_tlab_allocation(), 796 "Should support thread-local allocation buffers"); 797 ThreadLocalAllocBuffer::startup_initialization(); 798 } 799 return JNI_OK; 800 } 801 802 void Universe::print_compressed_oops_mode(outputStream* st) { 803 st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 804 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 805 806 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 807 808 if (Universe::narrow_oop_base() != 0) { 809 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 810 } 811 812 if (Universe::narrow_oop_shift() != 0) { 813 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 814 } 815 816 if (!Universe::narrow_oop_use_implicit_null_checks()) { 817 st->print(", no protected page in front of the heap"); 818 } 819 st->cr(); 820 } 821 822 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 823 824 assert(alignment <= Arguments::conservative_max_heap_alignment(), 825 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 826 alignment, Arguments::conservative_max_heap_alignment()); 827 828 size_t total_reserved = align_up(heap_size, alignment); 829 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 830 "heap size is too big for compressed oops"); 831 832 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size()); 833 assert(!UseLargePages 834 || UseParallelGC 835 || use_large_pages, "Wrong alignment to use large pages"); 836 837 // Now create the space. 838 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt); 839 840 if (total_rs.is_reserved()) { 841 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 842 "must be exactly of required size and alignment"); 843 // We are good. 844 845 if (UseCompressedOops) { 846 // Universe::initialize_heap() will reset this to NULL if unscaled 847 // or zero-based narrow oops are actually used. 848 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 849 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 850 } 851 852 if (AllocateHeapAt != NULL) { 853 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 854 } 855 return total_rs; 856 } 857 858 vm_exit_during_initialization( 859 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 860 total_reserved/K)); 861 862 // satisfy compiler 863 ShouldNotReachHere(); 864 return ReservedHeapSpace(0, 0, false); 865 } 866 867 868 // It's the caller's responsibility to ensure glitch-freedom 869 // (if required). 870 void Universe::update_heap_info_at_gc() { 871 _heap_capacity_at_last_gc = heap()->capacity(); 872 _heap_used_at_last_gc = heap()->used(); 873 } 874 875 876 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 877 switch (mode) { 878 case UnscaledNarrowOop: 879 return "32-bit"; 880 case ZeroBasedNarrowOop: 881 return "Zero based"; 882 case DisjointBaseNarrowOop: 883 return "Non-zero disjoint base"; 884 case HeapBasedNarrowOop: 885 return "Non-zero based"; 886 default: 887 ShouldNotReachHere(); 888 return ""; 889 } 890 } 891 892 893 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 894 if (narrow_oop_base_disjoint()) { 895 return DisjointBaseNarrowOop; 896 } 897 898 if (narrow_oop_base() != 0) { 899 return HeapBasedNarrowOop; 900 } 901 902 if (narrow_oop_shift() != 0) { 903 return ZeroBasedNarrowOop; 904 } 905 906 return UnscaledNarrowOop; 907 } 908 909 void initialize_known_method(LatestMethodCache* method_cache, 910 InstanceKlass* ik, 911 const char* method, 912 Symbol* signature, 913 bool is_static, TRAPS) 914 { 915 TempNewSymbol name = SymbolTable::new_symbol(method, CHECK); 916 Method* m = NULL; 917 // The klass must be linked before looking up the method. 918 if (!ik->link_class_or_fail(THREAD) || 919 ((m = ik->find_method(name, signature)) == NULL) || 920 is_static != m->is_static()) { 921 ResourceMark rm(THREAD); 922 // NoSuchMethodException doesn't actually work because it tries to run the 923 // <init> function before java_lang_Class is linked. Print error and exit. 924 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 925 ik->name()->as_C_string(), method)); 926 } 927 method_cache->init(ik, m); 928 } 929 930 void Universe::initialize_known_methods(TRAPS) { 931 // Set up static method for registering finalizers 932 initialize_known_method(_finalizer_register_cache, 933 SystemDictionary::Finalizer_klass(), 934 "register", 935 vmSymbols::object_void_signature(), true, CHECK); 936 937 initialize_known_method(_throw_illegal_access_error_cache, 938 SystemDictionary::internal_Unsafe_klass(), 939 "throwIllegalAccessError", 940 vmSymbols::void_method_signature(), true, CHECK); 941 942 initialize_known_method(_throw_no_such_method_error_cache, 943 SystemDictionary::internal_Unsafe_klass(), 944 "throwNoSuchMethodError", 945 vmSymbols::void_method_signature(), true, CHECK); 946 947 // Set up method for registering loaded classes in class loader vector 948 initialize_known_method(_loader_addClass_cache, 949 SystemDictionary::ClassLoader_klass(), 950 "addClass", 951 vmSymbols::class_void_signature(), false, CHECK); 952 953 // Set up method for stack walking 954 initialize_known_method(_do_stack_walk_cache, 955 SystemDictionary::AbstractStackWalker_klass(), 956 "doStackWalk", 957 vmSymbols::doStackWalk_signature(), false, CHECK); 958 } 959 960 void universe2_init() { 961 EXCEPTION_MARK; 962 Universe::genesis(CATCH); 963 } 964 965 // Set after initialization of the module runtime, call_initModuleRuntime 966 void universe_post_module_init() { 967 Universe::_module_initialized = true; 968 } 969 970 bool universe_post_init() { 971 assert(!is_init_completed(), "Error: initialization not yet completed!"); 972 Universe::_fully_initialized = true; 973 EXCEPTION_MARK; 974 { ResourceMark rm; 975 Interpreter::initialize(); // needed for interpreter entry points 976 if (!UseSharedSpaces) { 977 Universe::reinitialize_vtables(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 Universe::_out_of_memory_error_retry = ik->allocate_instance(CHECK_false); 997 998 // Setup preallocated cause message for delayed StackOverflowError 999 if (StackReservedPages > 0) { 1000 Universe::_delayed_stack_overflow_error_message = 1001 java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1002 } 1003 1004 // Setup preallocated NullPointerException 1005 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1006 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1007 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1008 // Setup preallocated ArithmeticException 1009 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1010 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1011 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1012 // Virtual Machine Error for when we get into a situation we can't resolve 1013 k = SystemDictionary::resolve_or_fail( 1014 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1015 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1016 if (!linked) { 1017 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1018 return false; // initialization failed 1019 } 1020 Universe::_virtual_machine_error_instance = 1021 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1022 1023 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1024 1025 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1026 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1027 1028 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 1029 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1030 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 1031 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1032 1033 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1034 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1035 1036 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1037 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1038 1039 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 1040 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 1041 1042 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK_false); 1043 java_lang_Throwable::set_message(Universe::_out_of_memory_error_retry, msg()); 1044 1045 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1046 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1047 1048 // Setup the array of errors that have preallocated backtrace 1049 k = Universe::_out_of_memory_error_java_heap->klass(); 1050 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1051 ik = InstanceKlass::cast(k); 1052 1053 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1054 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false); 1055 for (int i=0; i<len; i++) { 1056 oop err = ik->allocate_instance(CHECK_false); 1057 Handle err_h = Handle(THREAD, err); 1058 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1059 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1060 } 1061 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1062 1063 Universe::initialize_known_methods(CHECK_false); 1064 1065 // This needs to be done before the first scavenge/gc, since 1066 // it's an input to soft ref clearing policy. 1067 { 1068 MutexLocker x(Heap_lock); 1069 Universe::update_heap_info_at_gc(); 1070 } 1071 1072 // ("weak") refs processing infrastructure initialization 1073 Universe::heap()->post_initialize(); 1074 1075 MemoryService::add_metaspace_memory_pools(); 1076 1077 MemoryService::set_universe_heap(Universe::heap()); 1078 #if INCLUDE_CDS 1079 MetaspaceShared::post_initialize(CHECK_false); 1080 #endif 1081 return true; 1082 } 1083 1084 1085 void Universe::compute_base_vtable_size() { 1086 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1087 } 1088 1089 void Universe::print_on(outputStream* st) { 1090 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1091 st->print_cr("Heap"); 1092 heap()->print_on(st); 1093 } 1094 1095 void Universe::print_heap_at_SIGBREAK() { 1096 if (PrintHeapAtSIGBREAK) { 1097 print_on(tty); 1098 tty->cr(); 1099 tty->flush(); 1100 } 1101 } 1102 1103 void Universe::print_heap_before_gc() { 1104 LogTarget(Debug, gc, heap) lt; 1105 if (lt.is_enabled()) { 1106 LogStream ls(lt); 1107 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1108 ResourceMark rm; 1109 heap()->print_on(&ls); 1110 } 1111 } 1112 1113 void Universe::print_heap_after_gc() { 1114 LogTarget(Debug, gc, heap) lt; 1115 if (lt.is_enabled()) { 1116 LogStream ls(lt); 1117 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1118 ResourceMark rm; 1119 heap()->print_on(&ls); 1120 } 1121 } 1122 1123 void Universe::initialize_verify_flags() { 1124 verify_flags = 0; 1125 const char delimiter[] = " ,"; 1126 1127 size_t length = strlen(VerifySubSet); 1128 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1129 strncpy(subset_list, VerifySubSet, length + 1); 1130 char* save_ptr; 1131 1132 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1133 while (token != NULL) { 1134 if (strcmp(token, "threads") == 0) { 1135 verify_flags |= Verify_Threads; 1136 } else if (strcmp(token, "heap") == 0) { 1137 verify_flags |= Verify_Heap; 1138 } else if (strcmp(token, "symbol_table") == 0) { 1139 verify_flags |= Verify_SymbolTable; 1140 } else if (strcmp(token, "string_table") == 0) { 1141 verify_flags |= Verify_StringTable; 1142 } else if (strcmp(token, "codecache") == 0) { 1143 verify_flags |= Verify_CodeCache; 1144 } else if (strcmp(token, "dictionary") == 0) { 1145 verify_flags |= Verify_SystemDictionary; 1146 } else if (strcmp(token, "classloader_data_graph") == 0) { 1147 verify_flags |= Verify_ClassLoaderDataGraph; 1148 } else if (strcmp(token, "metaspace") == 0) { 1149 verify_flags |= Verify_MetaspaceUtils; 1150 } else if (strcmp(token, "jni_handles") == 0) { 1151 verify_flags |= Verify_JNIHandles; 1152 } else if (strcmp(token, "codecache_oops") == 0) { 1153 verify_flags |= Verify_CodeCacheOops; 1154 } else { 1155 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1156 } 1157 token = strtok_r(NULL, delimiter, &save_ptr); 1158 } 1159 FREE_C_HEAP_ARRAY(char, subset_list); 1160 } 1161 1162 bool Universe::should_verify_subset(uint subset) { 1163 if (verify_flags & subset) { 1164 return true; 1165 } 1166 return false; 1167 } 1168 1169 void Universe::verify(VerifyOption option, const char* prefix) { 1170 // The use of _verify_in_progress is a temporary work around for 1171 // 6320749. Don't bother with a creating a class to set and clear 1172 // it since it is only used in this method and the control flow is 1173 // straight forward. 1174 _verify_in_progress = true; 1175 1176 COMPILER2_PRESENT( 1177 assert(!DerivedPointerTable::is_active(), 1178 "DPT should not be active during verification " 1179 "(of thread stacks below)"); 1180 ) 1181 1182 ResourceMark rm; 1183 HandleMark hm; // Handles created during verification can be zapped 1184 _verify_count++; 1185 1186 FormatBuffer<> title("Verifying %s", prefix); 1187 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1188 if (should_verify_subset(Verify_Threads)) { 1189 log_debug(gc, verify)("Threads"); 1190 Threads::verify(); 1191 } 1192 if (should_verify_subset(Verify_Heap)) { 1193 log_debug(gc, verify)("Heap"); 1194 heap()->verify(option); 1195 } 1196 if (should_verify_subset(Verify_SymbolTable)) { 1197 log_debug(gc, verify)("SymbolTable"); 1198 SymbolTable::verify(); 1199 } 1200 if (should_verify_subset(Verify_StringTable)) { 1201 log_debug(gc, verify)("StringTable"); 1202 StringTable::verify(); 1203 } 1204 if (should_verify_subset(Verify_CodeCache)) { 1205 { 1206 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1207 log_debug(gc, verify)("CodeCache"); 1208 CodeCache::verify(); 1209 } 1210 } 1211 if (should_verify_subset(Verify_SystemDictionary)) { 1212 log_debug(gc, verify)("SystemDictionary"); 1213 SystemDictionary::verify(); 1214 } 1215 #ifndef PRODUCT 1216 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1217 log_debug(gc, verify)("ClassLoaderDataGraph"); 1218 ClassLoaderDataGraph::verify(); 1219 } 1220 #endif 1221 if (should_verify_subset(Verify_MetaspaceUtils)) { 1222 log_debug(gc, verify)("MetaspaceUtils"); 1223 MetaspaceUtils::verify_free_chunks(); 1224 } 1225 if (should_verify_subset(Verify_JNIHandles)) { 1226 log_debug(gc, verify)("JNIHandles"); 1227 JNIHandles::verify(); 1228 } 1229 if (should_verify_subset(Verify_CodeCacheOops)) { 1230 log_debug(gc, verify)("CodeCache Oops"); 1231 CodeCache::verify_oops(); 1232 } 1233 1234 _verify_in_progress = false; 1235 } 1236 1237 1238 #ifndef PRODUCT 1239 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1240 assert(low_boundary < high_boundary, "bad interval"); 1241 1242 // decide which low-order bits we require to be clear: 1243 size_t alignSize = MinObjAlignmentInBytes; 1244 size_t min_object_size = CollectedHeap::min_fill_size(); 1245 1246 // make an inclusive limit: 1247 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1248 uintptr_t min = (uintptr_t)low_boundary; 1249 assert(min < max, "bad interval"); 1250 uintptr_t diff = max ^ min; 1251 1252 // throw away enough low-order bits to make the diff vanish 1253 uintptr_t mask = (uintptr_t)(-1); 1254 while ((mask & diff) != 0) 1255 mask <<= 1; 1256 uintptr_t bits = (min & mask); 1257 assert(bits == (max & mask), "correct mask"); 1258 // check an intermediate value between min and max, just to make sure: 1259 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1260 1261 // require address alignment, too: 1262 mask |= (alignSize - 1); 1263 1264 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1265 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1266 } 1267 _verify_oop_mask = mask; 1268 _verify_oop_bits = bits; 1269 } 1270 1271 // Oop verification (see MacroAssembler::verify_oop) 1272 1273 uintptr_t Universe::verify_oop_mask() { 1274 MemRegion m = heap()->reserved_region(); 1275 calculate_verify_data(m.start(), m.end()); 1276 return _verify_oop_mask; 1277 } 1278 1279 uintptr_t Universe::verify_oop_bits() { 1280 MemRegion m = heap()->reserved_region(); 1281 calculate_verify_data(m.start(), m.end()); 1282 return _verify_oop_bits; 1283 } 1284 1285 uintptr_t Universe::verify_mark_mask() { 1286 return markOopDesc::lock_mask_in_place; 1287 } 1288 1289 uintptr_t Universe::verify_mark_bits() { 1290 intptr_t mask = verify_mark_mask(); 1291 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1292 assert((bits & ~mask) == 0, "no stray header bits"); 1293 return bits; 1294 } 1295 #endif // PRODUCT 1296 1297 1298 void LatestMethodCache::init(Klass* k, Method* m) { 1299 if (!UseSharedSpaces) { 1300 _klass = k; 1301 } 1302 #ifndef PRODUCT 1303 else { 1304 // sharing initilization should have already set up _klass 1305 assert(_klass != NULL, "just checking"); 1306 } 1307 #endif 1308 1309 _method_idnum = m->method_idnum(); 1310 assert(_method_idnum >= 0, "sanity check"); 1311 } 1312 1313 1314 Method* LatestMethodCache::get_method() { 1315 if (klass() == NULL) return NULL; 1316 InstanceKlass* ik = InstanceKlass::cast(klass()); 1317 Method* m = ik->method_with_idnum(method_idnum()); 1318 assert(m != NULL, "sanity check"); 1319 return m; 1320 } 1321 1322 1323 #ifdef ASSERT 1324 // Release dummy object(s) at bottom of heap 1325 bool Universe::release_fullgc_alot_dummy() { 1326 MutexLocker ml(FullGCALot_lock); 1327 if (_fullgc_alot_dummy_array != NULL) { 1328 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1329 // No more dummies to release, release entire array instead 1330 _fullgc_alot_dummy_array = NULL; 1331 return false; 1332 } 1333 if (!UseConcMarkSweepGC) { 1334 // Release dummy at bottom of old generation 1335 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1336 } 1337 // Release dummy at bottom of permanent generation 1338 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1339 } 1340 return true; 1341 } 1342 1343 #endif // ASSERT