1 /* 2 * Copyright (c) 1997, 2022, 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 "cds/archiveHeapLoader.hpp" 27 #include "cds/dynamicArchive.hpp" 28 #include "cds/heapShared.hpp" 29 #include "cds/metaspaceShared.hpp" 30 #include "classfile/classLoader.hpp" 31 #include "classfile/classLoaderDataGraph.hpp" 32 #include "classfile/javaClasses.hpp" 33 #include "classfile/stringTable.hpp" 34 #include "classfile/symbolTable.hpp" 35 #include "classfile/systemDictionary.hpp" 36 #include "classfile/vmClasses.hpp" 37 #include "classfile/vmSymbols.hpp" 38 #include "code/codeBehaviours.hpp" 39 #include "code/codeCache.hpp" 40 #include "compiler/oopMap.hpp" 41 #include "gc/shared/collectedHeap.inline.hpp" 42 #include "gc/shared/gcArguments.hpp" 43 #include "gc/shared/gcConfig.hpp" 44 #include "gc/shared/gcLogPrecious.hpp" 45 #include "gc/shared/gcTraceTime.inline.hpp" 46 #include "gc/shared/oopStorageSet.hpp" 47 #include "gc/shared/plab.hpp" 48 #include "gc/shared/stringdedup/stringDedup.hpp" 49 #include "gc/shared/tlab_globals.hpp" 50 #include "logging/log.hpp" 51 #include "logging/logStream.hpp" 52 #include "memory/metadataFactory.hpp" 53 #include "memory/metaspaceClosure.hpp" 54 #include "memory/metaspaceCounters.hpp" 55 #include "memory/metaspaceUtils.hpp" 56 #include "memory/oopFactory.hpp" 57 #include "memory/resourceArea.hpp" 58 #include "memory/universe.hpp" 59 #include "oops/compressedOops.hpp" 60 #include "oops/instanceKlass.hpp" 61 #include "oops/instanceMirrorKlass.hpp" 62 #include "oops/klass.inline.hpp" 63 #include "oops/objArrayOop.inline.hpp" 64 #include "oops/oop.inline.hpp" 65 #include "oops/oopHandle.inline.hpp" 66 #include "oops/typeArrayKlass.hpp" 67 #include "prims/resolvedMethodTable.hpp" 68 #include "runtime/arguments.hpp" 69 #include "runtime/atomic.hpp" 70 #include "runtime/flags/jvmFlagLimit.hpp" 71 #include "runtime/handles.inline.hpp" 72 #include "runtime/init.hpp" 73 #include "runtime/java.hpp" 74 #include "runtime/javaThread.hpp" 75 #include "runtime/jniHandles.hpp" 76 #include "runtime/threads.hpp" 77 #include "runtime/timerTrace.hpp" 78 #include "services/memoryService.hpp" 79 #include "utilities/align.hpp" 80 #include "utilities/autoRestore.hpp" 81 #include "utilities/debug.hpp" 82 #include "utilities/formatBuffer.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 Klass* Universe::_fillerArrayKlassObj = NULL; 91 OopHandle Universe::_basic_type_mirrors[T_VOID+1]; 92 #if INCLUDE_CDS_JAVA_HEAP 93 int Universe::_archived_basic_type_mirror_indices[T_VOID+1]; 94 #endif 95 96 OopHandle Universe::_main_thread_group; 97 OopHandle Universe::_system_thread_group; 98 OopHandle Universe::_the_empty_class_array; 99 OopHandle Universe::_the_null_string; 100 OopHandle Universe::_the_min_jint_string; 101 102 OopHandle Universe::_the_null_sentinel; 103 104 // _out_of_memory_errors is an objArray 105 enum OutOfMemoryInstance { _oom_java_heap, 106 _oom_c_heap, 107 _oom_metaspace, 108 _oom_class_metaspace, 109 _oom_array_size, 110 _oom_gc_overhead_limit, 111 _oom_realloc_objects, 112 _oom_retry, 113 _oom_count }; 114 115 OopHandle Universe::_out_of_memory_errors; 116 OopHandle Universe::_delayed_stack_overflow_error_message; 117 OopHandle Universe::_preallocated_out_of_memory_error_array; 118 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 119 120 // Message details for OOME objects, preallocate these objects since they could be 121 // used when throwing OOME, we should try to avoid further allocation in such case 122 OopHandle Universe::_msg_metaspace; 123 OopHandle Universe::_msg_class_metaspace; 124 125 OopHandle Universe::_null_ptr_exception_instance; 126 OopHandle Universe::_arithmetic_exception_instance; 127 OopHandle Universe::_virtual_machine_error_instance; 128 129 OopHandle Universe::_reference_pending_list; 130 131 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 132 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 133 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 134 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 135 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL; 136 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 137 LatestMethodCache* Universe::_is_substitutable_cache = NULL; 138 LatestMethodCache* Universe::_value_object_hash_code_cache = NULL; 139 140 long Universe::verify_flags = Universe::Verify_All; 141 142 Array<int>* Universe::_the_empty_int_array = NULL; 143 Array<u2>* Universe::_the_empty_short_array = NULL; 144 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 145 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL; 146 Array<Method*>* Universe::_the_empty_method_array = NULL; 147 148 // These variables are guarded by FullGCALot_lock. 149 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;) 150 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 151 152 // Heap 153 int Universe::_verify_count = 0; 154 155 // Oop verification (see MacroAssembler::verify_oop) 156 uintptr_t Universe::_verify_oop_mask = 0; 157 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 158 159 int Universe::_base_vtable_size = 0; 160 bool Universe::_bootstrapping = false; 161 bool Universe::_module_initialized = false; 162 bool Universe::_fully_initialized = false; 163 164 OopStorage* Universe::_vm_weak = NULL; 165 OopStorage* Universe::_vm_global = NULL; 166 167 CollectedHeap* Universe::_collectedHeap = NULL; 168 169 objArrayOop Universe::the_empty_class_array () { 170 return (objArrayOop)_the_empty_class_array.resolve(); 171 } 172 173 oop Universe::main_thread_group() { return _main_thread_group.resolve(); } 174 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); } 175 176 oop Universe::system_thread_group() { return _system_thread_group.resolve(); } 177 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); } 178 179 oop Universe::the_null_string() { return _the_null_string.resolve(); } 180 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); } 181 182 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); } 183 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); } 184 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); } 185 186 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); } 187 188 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); } 189 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); } 190 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); } 191 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); } 192 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); } 193 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); } 194 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); } 195 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); } 196 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); } 197 198 oop Universe::java_mirror(BasicType t) { 199 assert((uint)t < T_VOID+1, "range check"); 200 assert(!is_reference_type(t), "sanity"); 201 return check_mirror(_basic_type_mirrors[t].resolve()); 202 } 203 204 void Universe::basic_type_classes_do(KlassClosure *closure) { 205 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 206 closure->do_klass(_typeArrayKlassObjs[i]); 207 } 208 // We don't do the following because it will confuse JVMTI. 209 // _fillerArrayKlassObj is used only by GC, which doesn't need to see 210 // this klass from basic_type_classes_do(). 211 // 212 // closure->do_klass(_fillerArrayKlassObj); 213 } 214 215 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 216 it->push(&_klass); 217 } 218 219 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 220 it->push(&_fillerArrayKlassObj); 221 for (int i = 0; i < T_LONG+1; i++) { 222 it->push(&_typeArrayKlassObjs[i]); 223 } 224 it->push(&_objectArrayKlassObj); 225 226 it->push(&_the_empty_int_array); 227 it->push(&_the_empty_short_array); 228 it->push(&_the_empty_klass_array); 229 it->push(&_the_empty_instance_klass_array); 230 it->push(&_the_empty_method_array); 231 it->push(&_the_array_interfaces_array); 232 233 _finalizer_register_cache->metaspace_pointers_do(it); 234 _loader_addClass_cache->metaspace_pointers_do(it); 235 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 236 _throw_no_such_method_error_cache->metaspace_pointers_do(it); 237 _do_stack_walk_cache->metaspace_pointers_do(it); 238 _is_substitutable_cache->metaspace_pointers_do(it); 239 _value_object_hash_code_cache->metaspace_pointers_do(it); 240 } 241 242 #if INCLUDE_CDS_JAVA_HEAP 243 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) { 244 assert(DumpSharedSpaces, "dump-time only"); 245 assert(!is_reference_type(t), "sanity"); 246 _archived_basic_type_mirror_indices[t] = index; 247 } 248 249 void Universe::update_archived_basic_type_mirrors() { 250 if (ArchiveHeapLoader::are_archived_mirrors_available()) { 251 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 252 int index = _archived_basic_type_mirror_indices[i]; 253 if (!is_reference_type((BasicType)i) && index >= 0) { 254 oop mirror_oop = HeapShared::get_root(index); 255 assert(mirror_oop != NULL, "must be"); 256 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop); 257 } 258 } 259 } 260 } 261 #endif 262 263 void Universe::serialize(SerializeClosure* f) { 264 265 #if INCLUDE_CDS_JAVA_HEAP 266 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 267 f->do_u4((u4*)&_archived_basic_type_mirror_indices[i]); 268 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap 269 // contents may need to be relocated. _basic_type_mirrors[i] will be 270 // updated later in Universe::update_archived_basic_type_mirrors(). 271 } 272 #endif 273 274 f->do_ptr((void**)&_fillerArrayKlassObj); 275 for (int i = 0; i < T_LONG+1; i++) { 276 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 277 } 278 279 f->do_ptr((void**)&_objectArrayKlassObj); 280 f->do_ptr((void**)&_the_array_interfaces_array); 281 f->do_ptr((void**)&_the_empty_int_array); 282 f->do_ptr((void**)&_the_empty_short_array); 283 f->do_ptr((void**)&_the_empty_method_array); 284 f->do_ptr((void**)&_the_empty_klass_array); 285 f->do_ptr((void**)&_the_empty_instance_klass_array); 286 _finalizer_register_cache->serialize(f); 287 _loader_addClass_cache->serialize(f); 288 _throw_illegal_access_error_cache->serialize(f); 289 _throw_no_such_method_error_cache->serialize(f); 290 _do_stack_walk_cache->serialize(f); 291 _is_substitutable_cache->serialize(f); 292 _value_object_hash_code_cache->serialize(f); 293 } 294 295 296 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 297 if (size < alignment || size % alignment != 0) { 298 vm_exit_during_initialization( 299 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 300 } 301 } 302 303 void initialize_basic_type_klass(Klass* k, TRAPS) { 304 Klass* ok = vmClasses::Object_klass(); 305 #if INCLUDE_CDS 306 if (UseSharedSpaces) { 307 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 308 assert(k->super() == ok, "u3"); 309 if (k->is_instance_klass()) { 310 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK); 311 } else { 312 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK); 313 } 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(THREAD); 324 HandleMark hm(THREAD); 325 326 { AutoModifyRestore<bool> temporarily(_bootstrapping, true); 327 328 { MutexLocker mc(THREAD, Compile_lock); 329 330 java_lang_Class::allocate_fixup_lists(); 331 332 // determine base vtable size; without that we cannot create the array klasses 333 compute_base_vtable_size(); 334 335 if (!UseSharedSpaces) { 336 // Initialization of the fillerArrayKlass must come before regular 337 // int-TypeArrayKlass so that the int-Array mirror points to the 338 // int-TypeArrayKlass. 339 _fillerArrayKlassObj = TypeArrayKlass::create_klass(T_INT, "Ljdk/internal/vm/FillerArray;", CHECK); 340 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 341 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 342 } 343 344 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 345 346 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 347 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 348 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 349 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 350 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 351 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 352 } 353 } 354 355 vmSymbols::initialize(); 356 357 SystemDictionary::initialize(CHECK); 358 359 // Create string constants 360 oop s = StringTable::intern("null", CHECK); 361 _the_null_string = OopHandle(vm_global(), s); 362 s = StringTable::intern("-2147483648", CHECK); 363 _the_min_jint_string = OopHandle(vm_global(), s); 364 365 366 #if INCLUDE_CDS 367 if (UseSharedSpaces) { 368 // Verify shared interfaces array. 369 assert(_the_array_interfaces_array->at(0) == 370 vmClasses::Cloneable_klass(), "u3"); 371 assert(_the_array_interfaces_array->at(1) == 372 vmClasses::Serializable_klass(), "u3"); 373 374 } else 375 #endif 376 { 377 // Set up shared interfaces array. (Do this before supers are set up.) 378 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass()); 379 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass()); 380 } 381 382 initialize_basic_type_klass(_fillerArrayKlassObj, CHECK); 383 384 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 385 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 386 initialize_basic_type_klass(floatArrayKlassObj(), CHECK); 387 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 388 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 389 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 390 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 391 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 392 393 assert(_fillerArrayKlassObj != intArrayKlassObj(), 394 "Internal filler array klass should be different to int array Klass"); 395 } // end of core bootstrapping 396 397 { 398 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 399 _the_null_sentinel = OopHandle(vm_global(), tns()); 400 } 401 402 // Create a handle for reference_pending_list 403 _reference_pending_list = OopHandle(vm_global(), NULL); 404 405 // Maybe this could be lifted up now that object array can be initialized 406 // during the bootstrapping. 407 408 // OLD 409 // Initialize _objectArrayKlass after core bootstraping to make 410 // sure the super class is set up properly for _objectArrayKlass. 411 // --- 412 // NEW 413 // Since some of the old system object arrays have been converted to 414 // ordinary object arrays, _objectArrayKlass will be loaded when 415 // SystemDictionary::initialize(CHECK); is run. See the extra check 416 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 417 _objectArrayKlassObj = InstanceKlass:: 418 cast(vmClasses::Object_klass())->array_klass(1, CHECK); 419 // OLD 420 // Add the class to the class hierarchy manually to make sure that 421 // its vtable is initialized after core bootstrapping is completed. 422 // --- 423 // New 424 // Have already been initialized. 425 _objectArrayKlassObj->append_to_sibling_list(); 426 427 #ifdef ASSERT 428 if (FullGCALot) { 429 // Allocate an array of dummy objects. 430 // We'd like these to be at the bottom of the old generation, 431 // so that when we free one and then collect, 432 // (almost) the whole heap moves 433 // and we find out if we actually update all the oops correctly. 434 // But we can't allocate directly in the old generation, 435 // so we allocate wherever, and hope that the first collection 436 // moves these objects to the bottom of the old generation. 437 int size = FullGCALotDummies * 2; 438 439 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK); 440 objArrayHandle dummy_array(THREAD, naked_array); 441 int i = 0; 442 while (i < size) { 443 // Allocate dummy in old generation 444 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK); 445 dummy_array->obj_at_put(i++, dummy); 446 } 447 { 448 // Only modify the global variable inside the mutex. 449 // If we had a race to here, the other dummy_array instances 450 // and their elements just get dropped on the floor, which is fine. 451 MutexLocker ml(THREAD, FullGCALot_lock); 452 if (_fullgc_alot_dummy_array.is_empty()) { 453 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array()); 454 } 455 } 456 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking"); 457 } 458 #endif 459 } 460 461 void Universe::initialize_basic_type_mirrors(TRAPS) { 462 #if INCLUDE_CDS_JAVA_HEAP 463 if (UseSharedSpaces && 464 ArchiveHeapLoader::are_archived_mirrors_available() && 465 _basic_type_mirrors[T_INT].resolve() != NULL) { 466 assert(ArchiveHeapLoader::can_use(), "Sanity"); 467 468 // check that all basic type mirrors are mapped also 469 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 470 if (!is_reference_type((BasicType)i)) { 471 oop m = _basic_type_mirrors[i].resolve(); 472 assert(m != NULL, "archived mirrors should not be NULL"); 473 } 474 } 475 } else 476 // _basic_type_mirrors[T_INT], etc, are NULL if archived heap is not mapped. 477 #endif 478 { 479 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 480 BasicType bt = (BasicType)i; 481 if (!is_reference_type(bt)) { 482 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK); 483 _basic_type_mirrors[i] = OopHandle(vm_global(), m); 484 } 485 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1); 486 } 487 } 488 } 489 490 void Universe::fixup_mirrors(TRAPS) { 491 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 492 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 493 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 494 // that the number of objects allocated at this point is very small. 495 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded"); 496 HandleMark hm(THREAD); 497 498 if (!UseSharedSpaces) { 499 // Cache the start of the static fields 500 InstanceMirrorKlass::init_offset_of_static_fields(); 501 } 502 503 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 504 int list_length = list->length(); 505 for (int i = 0; i < list_length; i++) { 506 Klass* k = list->at(i); 507 assert(k->is_klass(), "List should only hold classes"); 508 java_lang_Class::fixup_mirror(k, CATCH); 509 } 510 delete java_lang_Class::fixup_mirror_list(); 511 java_lang_Class::set_fixup_mirror_list(NULL); 512 } 513 514 #define assert_pll_locked(test) \ 515 assert(Heap_lock->test(), "Reference pending list access requires lock") 516 517 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 518 519 oop Universe::reference_pending_list() { 520 if (Thread::current()->is_VM_thread()) { 521 assert_pll_locked(is_locked); 522 } else { 523 assert_pll_ownership(); 524 } 525 return _reference_pending_list.resolve(); 526 } 527 528 void Universe::clear_reference_pending_list() { 529 assert_pll_ownership(); 530 _reference_pending_list.replace(NULL); 531 } 532 533 bool Universe::has_reference_pending_list() { 534 assert_pll_ownership(); 535 return _reference_pending_list.peek() != NULL; 536 } 537 538 oop Universe::swap_reference_pending_list(oop list) { 539 assert_pll_locked(is_locked); 540 return _reference_pending_list.xchg(list); 541 } 542 543 #undef assert_pll_locked 544 #undef assert_pll_ownership 545 546 static void reinitialize_vtables() { 547 // The vtables are initialized by starting at java.lang.Object and 548 // initializing through the subclass links, so that the super 549 // classes are always initialized first. 550 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) { 551 Klass* sub = iter.klass(); 552 sub->vtable().initialize_vtable(); 553 } 554 } 555 556 static void reinitialize_itables() { 557 558 class ReinitTableClosure : public KlassClosure { 559 public: 560 void do_klass(Klass* k) { 561 if (k->is_instance_klass()) { 562 InstanceKlass::cast(k)->itable().initialize_itable(); 563 } 564 } 565 }; 566 567 MutexLocker mcld(ClassLoaderDataGraph_lock); 568 ReinitTableClosure cl; 569 ClassLoaderDataGraph::classes_do(&cl); 570 } 571 572 bool Universe::on_page_boundary(void* addr) { 573 return is_aligned(addr, os::vm_page_size()); 574 } 575 576 // the array of preallocated errors with backtraces 577 objArrayOop Universe::preallocated_out_of_memory_errors() { 578 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve(); 579 } 580 581 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); } 582 583 oop Universe::out_of_memory_error_java_heap() { 584 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap)); 585 } 586 587 oop Universe::out_of_memory_error_c_heap() { 588 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap)); 589 } 590 591 oop Universe::out_of_memory_error_metaspace() { 592 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace)); 593 } 594 595 oop Universe::out_of_memory_error_class_metaspace() { 596 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace)); 597 } 598 599 oop Universe::out_of_memory_error_array_size() { 600 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size)); 601 } 602 603 oop Universe::out_of_memory_error_gc_overhead_limit() { 604 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit)); 605 } 606 607 oop Universe::out_of_memory_error_realloc_objects() { 608 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects)); 609 } 610 611 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM 612 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); } 613 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); } 614 615 616 bool Universe::should_fill_in_stack_trace(Handle throwable) { 617 // never attempt to fill in the stack trace of preallocated errors that do not have 618 // backtrace. These errors are kept alive forever and may be "re-used" when all 619 // preallocated errors with backtrace have been consumed. Also need to avoid 620 // a potential loop which could happen if an out of memory occurs when attempting 621 // to allocate the backtrace. 622 objArrayOop preallocated_oom = out_of_memory_errors(); 623 for (int i = 0; i < _oom_count; i++) { 624 if (throwable() == preallocated_oom->obj_at(i)) { 625 return false; 626 } 627 } 628 return true; 629 } 630 631 632 oop Universe::gen_out_of_memory_error(oop default_err) { 633 // generate an out of memory error: 634 // - if there is a preallocated error and stack traces are available 635 // (j.l.Throwable is initialized), then return the preallocated 636 // error with a filled in stack trace, and with the message 637 // provided by the default error. 638 // - otherwise, return the default error, without a stack trace. 639 int next; 640 if ((_preallocated_out_of_memory_error_avail_count > 0) && 641 vmClasses::Throwable_klass()->is_initialized()) { 642 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1); 643 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 644 } else { 645 next = -1; 646 } 647 if (next < 0) { 648 // all preallocated errors have been used. 649 // return default 650 return default_err; 651 } else { 652 JavaThread* current = JavaThread::current(); 653 Handle default_err_h(current, default_err); 654 // get the error object at the slot and set set it to NULL so that the 655 // array isn't keeping it alive anymore. 656 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next)); 657 assert(exc() != NULL, "slot has been used already"); 658 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 659 660 // use the message from the default error 661 oop msg = java_lang_Throwable::message(default_err_h()); 662 assert(msg != NULL, "no message"); 663 java_lang_Throwable::set_message(exc(), msg); 664 665 // populate the stack trace and return it. 666 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 667 return exc(); 668 } 669 } 670 671 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) { 672 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve(); 673 } 674 675 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) { 676 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve(); 677 } 678 679 // Setup preallocated OutOfMemoryError errors 680 void Universe::create_preallocated_out_of_memory_errors(TRAPS) { 681 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass(); 682 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK); 683 objArrayHandle oom_array(THREAD, oa); 684 685 for (int i = 0; i < _oom_count; i++) { 686 oop oom_obj = ik->allocate_instance(CHECK); 687 oom_array->obj_at_put(i, oom_obj); 688 } 689 _out_of_memory_errors = OopHandle(vm_global(), oom_array()); 690 691 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK); 692 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg()); 693 694 msg = java_lang_String::create_from_str("C heap space", CHECK); 695 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg()); 696 697 msg = java_lang_String::create_from_str("Metaspace", CHECK); 698 _msg_metaspace = OopHandle(vm_global(), msg()); 699 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg()); 700 701 msg = java_lang_String::create_from_str("Compressed class space", CHECK); 702 _msg_class_metaspace = OopHandle(vm_global(), msg()); 703 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg()); 704 705 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK); 706 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg()); 707 708 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK); 709 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg()); 710 711 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK); 712 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg()); 713 714 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK); 715 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg()); 716 717 // Setup the array of errors that have preallocated backtrace 718 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 719 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK); 720 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance); 721 objArrayHandle preallocated_oom_array(THREAD, instance); 722 723 for (int i=0; i<len; i++) { 724 oop err = ik->allocate_instance(CHECK); 725 Handle err_h(THREAD, err); 726 java_lang_Throwable::allocate_backtrace(err_h, CHECK); 727 preallocated_oom_array->obj_at_put(i, err_h()); 728 } 729 _preallocated_out_of_memory_error_avail_count = (jint)len; 730 } 731 732 intptr_t Universe::_non_oop_bits = 0; 733 734 void* Universe::non_oop_word() { 735 // Neither the high bits nor the low bits of this value is allowed 736 // to look like (respectively) the high or low bits of a real oop. 737 // 738 // High and low are CPU-specific notions, but low always includes 739 // the low-order bit. Since oops are always aligned at least mod 4, 740 // setting the low-order bit will ensure that the low half of the 741 // word will never look like that of a real oop. 742 // 743 // Using the OS-supplied non-memory-address word (usually 0 or -1) 744 // will take care of the high bits, however many there are. 745 746 if (_non_oop_bits == 0) { 747 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 748 } 749 750 return (void*)_non_oop_bits; 751 } 752 753 bool Universe::contains_non_oop_word(void* p) { 754 return *(void**)p == non_oop_word(); 755 } 756 757 static void initialize_global_behaviours() { 758 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour()); 759 } 760 761 jint universe_init() { 762 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 763 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 764 "LogHeapWordSize is incorrect."); 765 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 766 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 767 "oop size is not not a multiple of HeapWord size"); 768 769 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 770 771 initialize_global_behaviours(); 772 773 GCLogPrecious::initialize(); 774 775 #ifdef _LP64 776 MetaspaceShared::adjust_heap_sizes_for_dumping(); 777 #endif // _LP64 778 779 GCConfig::arguments()->initialize_heap_sizes(); 780 781 jint status = Universe::initialize_heap(); 782 if (status != JNI_OK) { 783 return status; 784 } 785 786 Universe::initialize_tlab(); 787 788 Metaspace::global_initialize(); 789 // Initialize performance counters for metaspaces 790 MetaspaceCounters::initialize_performance_counters(); 791 792 // Checks 'AfterMemoryInit' constraints. 793 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) { 794 return JNI_EINVAL; 795 } 796 797 // Create memory for metadata. Must be after initializing heap for 798 // DumpSharedSpaces. 799 ClassLoaderData::init_null_class_loader_data(); 800 801 // We have a heap so create the Method* caches before 802 // Metaspace::initialize_shared_spaces() tries to populate them. 803 Universe::_finalizer_register_cache = new LatestMethodCache(); 804 Universe::_loader_addClass_cache = new LatestMethodCache(); 805 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 806 Universe::_throw_no_such_method_error_cache = new LatestMethodCache(); 807 Universe::_do_stack_walk_cache = new LatestMethodCache(); 808 Universe::_is_substitutable_cache = new LatestMethodCache(); 809 Universe::_value_object_hash_code_cache = new LatestMethodCache(); 810 811 #if INCLUDE_CDS 812 DynamicArchive::check_for_dynamic_dump(); 813 if (UseSharedSpaces) { 814 // Read the data structures supporting the shared spaces (shared 815 // system dictionary, symbol table, etc.). After that, access to 816 // the file (other than the mapped regions) is no longer needed, and 817 // the file is closed. Closing the file does not affect the 818 // currently mapped regions. 819 MetaspaceShared::initialize_shared_spaces(); 820 StringTable::create_table(); 821 if (ArchiveHeapLoader::is_loaded()) { 822 StringTable::transfer_shared_strings_to_local_table(); 823 } 824 } else 825 #endif 826 { 827 SymbolTable::create_table(); 828 StringTable::create_table(); 829 } 830 831 #if INCLUDE_CDS 832 if (Arguments::is_dumping_archive()) { 833 MetaspaceShared::prepare_for_dumping(); 834 } 835 #endif 836 837 if (strlen(VerifySubSet) > 0) { 838 Universe::initialize_verify_flags(); 839 } 840 841 ResolvedMethodTable::create_table(); 842 843 return JNI_OK; 844 } 845 846 jint Universe::initialize_heap() { 847 assert(_collectedHeap == NULL, "Heap already created"); 848 _collectedHeap = GCConfig::arguments()->create_heap(); 849 850 log_info(gc)("Using %s", _collectedHeap->name()); 851 return _collectedHeap->initialize(); 852 } 853 854 void Universe::initialize_tlab() { 855 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 856 PLAB::startup_initialization(); 857 if (UseTLAB) { 858 ThreadLocalAllocBuffer::startup_initialization(); 859 } 860 } 861 862 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 863 864 assert(alignment <= Arguments::conservative_max_heap_alignment(), 865 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 866 alignment, Arguments::conservative_max_heap_alignment()); 867 868 size_t total_reserved = align_up(heap_size, alignment); 869 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 870 "heap size is too big for compressed oops"); 871 872 size_t page_size = os::vm_page_size(); 873 if (UseLargePages && is_aligned(alignment, os::large_page_size())) { 874 page_size = os::large_page_size(); 875 } else { 876 // Parallel is the only collector that might opt out of using large pages 877 // for the heap. 878 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages"); 879 } 880 881 // Now create the space. 882 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt); 883 884 if (total_rs.is_reserved()) { 885 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 886 "must be exactly of required size and alignment"); 887 // We are good. 888 889 if (AllocateHeapAt != NULL) { 890 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 891 } 892 893 if (UseCompressedOops) { 894 CompressedOops::initialize(total_rs); 895 } 896 897 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end()); 898 899 return total_rs; 900 } 901 902 vm_exit_during_initialization( 903 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 904 total_reserved/K)); 905 906 // satisfy compiler 907 ShouldNotReachHere(); 908 return ReservedHeapSpace(0, 0, os::vm_page_size()); 909 } 910 911 OopStorage* Universe::vm_weak() { 912 return Universe::_vm_weak; 913 } 914 915 OopStorage* Universe::vm_global() { 916 return Universe::_vm_global; 917 } 918 919 void Universe::oopstorage_init() { 920 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal); 921 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal); 922 } 923 924 void universe_oopstorage_init() { 925 Universe::oopstorage_init(); 926 } 927 928 void initialize_known_method(LatestMethodCache* method_cache, 929 InstanceKlass* ik, 930 const char* method, 931 Symbol* signature, 932 bool is_static, TRAPS) 933 { 934 TempNewSymbol name = SymbolTable::new_symbol(method); 935 Method* m = NULL; 936 // The klass must be linked before looking up the method. 937 if (!ik->link_class_or_fail(THREAD) || 938 ((m = ik->find_method(name, signature)) == NULL) || 939 is_static != m->is_static()) { 940 ResourceMark rm(THREAD); 941 // NoSuchMethodException doesn't actually work because it tries to run the 942 // <init> function before java_lang_Class is linked. Print error and exit. 943 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 944 ik->name()->as_C_string(), method)); 945 } 946 method_cache->init(ik, m); 947 } 948 949 void Universe::initialize_known_methods(TRAPS) { 950 // Set up static method for registering finalizers 951 initialize_known_method(_finalizer_register_cache, 952 vmClasses::Finalizer_klass(), 953 "register", 954 vmSymbols::object_void_signature(), true, CHECK); 955 956 initialize_known_method(_throw_illegal_access_error_cache, 957 vmClasses::internal_Unsafe_klass(), 958 "throwIllegalAccessError", 959 vmSymbols::void_method_signature(), true, CHECK); 960 961 initialize_known_method(_throw_no_such_method_error_cache, 962 vmClasses::internal_Unsafe_klass(), 963 "throwNoSuchMethodError", 964 vmSymbols::void_method_signature(), true, CHECK); 965 966 // Set up method for registering loaded classes in class loader vector 967 initialize_known_method(_loader_addClass_cache, 968 vmClasses::ClassLoader_klass(), 969 "addClass", 970 vmSymbols::class_void_signature(), false, CHECK); 971 972 // Set up method for stack walking 973 initialize_known_method(_do_stack_walk_cache, 974 vmClasses::AbstractStackWalker_klass(), 975 "doStackWalk", 976 vmSymbols::doStackWalk_signature(), false, CHECK); 977 978 // Set up substitutability testing 979 ResourceMark rm; 980 initialize_known_method(_is_substitutable_cache, 981 vmClasses::ValueObjectMethods_klass(), 982 vmSymbols::isSubstitutable_name()->as_C_string(), 983 vmSymbols::object_object_boolean_signature(), true, CHECK); 984 initialize_known_method(_value_object_hash_code_cache, 985 vmClasses::ValueObjectMethods_klass(), 986 vmSymbols::valueObjectHashCode_name()->as_C_string(), 987 vmSymbols::object_int_signature(), true, CHECK); 988 } 989 990 void universe2_init() { 991 EXCEPTION_MARK; 992 Universe::genesis(CATCH); 993 } 994 995 // Set after initialization of the module runtime, call_initModuleRuntime 996 void universe_post_module_init() { 997 Universe::_module_initialized = true; 998 } 999 1000 bool universe_post_init() { 1001 assert(!is_init_completed(), "Error: initialization not yet completed!"); 1002 Universe::_fully_initialized = true; 1003 EXCEPTION_MARK; 1004 if (!UseSharedSpaces) { 1005 reinitialize_vtables(); 1006 reinitialize_itables(); 1007 } 1008 1009 HandleMark hm(THREAD); 1010 // Setup preallocated empty java.lang.Class array for Method reflection. 1011 1012 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false); 1013 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array); 1014 1015 // Setup preallocated OutOfMemoryError errors 1016 Universe::create_preallocated_out_of_memory_errors(CHECK_false); 1017 1018 oop instance; 1019 // Setup preallocated cause message for delayed StackOverflowError 1020 if (StackReservedPages > 0) { 1021 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1022 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance); 1023 } 1024 1025 // Setup preallocated NullPointerException 1026 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1027 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1028 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1029 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance); 1030 1031 // Setup preallocated ArithmeticException 1032 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1033 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1034 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1035 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance); 1036 1037 // Virtual Machine Error for when we get into a situation we can't resolve 1038 k = vmClasses::VirtualMachineError_klass(); 1039 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1040 if (!linked) { 1041 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1042 return false; // initialization failed 1043 } 1044 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1045 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance); 1046 1047 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1048 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg()); 1049 1050 Universe::initialize_known_methods(CHECK_false); 1051 1052 // This needs to be done before the first scavenge/gc, since 1053 // it's an input to soft ref clearing policy. 1054 { 1055 MutexLocker x(THREAD, Heap_lock); 1056 Universe::heap()->update_capacity_and_used_at_gc(); 1057 } 1058 1059 // ("weak") refs processing infrastructure initialization 1060 Universe::heap()->post_initialize(); 1061 1062 MemoryService::add_metaspace_memory_pools(); 1063 1064 MemoryService::set_universe_heap(Universe::heap()); 1065 #if INCLUDE_CDS 1066 MetaspaceShared::post_initialize(CHECK_false); 1067 #endif 1068 return true; 1069 } 1070 1071 1072 void Universe::compute_base_vtable_size() { 1073 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1074 } 1075 1076 void Universe::print_on(outputStream* st) { 1077 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1078 st->print_cr("Heap"); 1079 heap()->print_on(st); 1080 } 1081 1082 void Universe::print_heap_at_SIGBREAK() { 1083 if (PrintHeapAtSIGBREAK) { 1084 print_on(tty); 1085 tty->cr(); 1086 tty->flush(); 1087 } 1088 } 1089 1090 void Universe::initialize_verify_flags() { 1091 verify_flags = 0; 1092 const char delimiter[] = " ,"; 1093 1094 size_t length = strlen(VerifySubSet); 1095 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1096 strncpy(subset_list, VerifySubSet, length + 1); 1097 char* save_ptr; 1098 1099 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1100 while (token != NULL) { 1101 if (strcmp(token, "threads") == 0) { 1102 verify_flags |= Verify_Threads; 1103 } else if (strcmp(token, "heap") == 0) { 1104 verify_flags |= Verify_Heap; 1105 } else if (strcmp(token, "symbol_table") == 0) { 1106 verify_flags |= Verify_SymbolTable; 1107 } else if (strcmp(token, "string_table") == 0) { 1108 verify_flags |= Verify_StringTable; 1109 } else if (strcmp(token, "codecache") == 0) { 1110 verify_flags |= Verify_CodeCache; 1111 } else if (strcmp(token, "dictionary") == 0) { 1112 verify_flags |= Verify_SystemDictionary; 1113 } else if (strcmp(token, "classloader_data_graph") == 0) { 1114 verify_flags |= Verify_ClassLoaderDataGraph; 1115 } else if (strcmp(token, "metaspace") == 0) { 1116 verify_flags |= Verify_MetaspaceUtils; 1117 } else if (strcmp(token, "jni_handles") == 0) { 1118 verify_flags |= Verify_JNIHandles; 1119 } else if (strcmp(token, "codecache_oops") == 0) { 1120 verify_flags |= Verify_CodeCacheOops; 1121 } else if (strcmp(token, "resolved_method_table") == 0) { 1122 verify_flags |= Verify_ResolvedMethodTable; 1123 } else if (strcmp(token, "stringdedup") == 0) { 1124 verify_flags |= Verify_StringDedup; 1125 } else { 1126 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1127 } 1128 token = strtok_r(NULL, delimiter, &save_ptr); 1129 } 1130 FREE_C_HEAP_ARRAY(char, subset_list); 1131 } 1132 1133 bool Universe::should_verify_subset(uint subset) { 1134 if (verify_flags & subset) { 1135 return true; 1136 } 1137 return false; 1138 } 1139 1140 void Universe::verify(VerifyOption option, const char* prefix) { 1141 COMPILER2_PRESENT( 1142 assert(!DerivedPointerTable::is_active(), 1143 "DPT should not be active during verification " 1144 "(of thread stacks below)"); 1145 ) 1146 1147 Thread* thread = Thread::current(); 1148 ResourceMark rm(thread); 1149 HandleMark hm(thread); // Handles created during verification can be zapped 1150 _verify_count++; 1151 1152 FormatBuffer<> title("Verifying %s", prefix); 1153 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1154 if (should_verify_subset(Verify_Threads)) { 1155 log_debug(gc, verify)("Threads"); 1156 Threads::verify(); 1157 } 1158 if (should_verify_subset(Verify_Heap)) { 1159 log_debug(gc, verify)("Heap"); 1160 heap()->verify(option); 1161 } 1162 if (should_verify_subset(Verify_SymbolTable)) { 1163 log_debug(gc, verify)("SymbolTable"); 1164 SymbolTable::verify(); 1165 } 1166 if (should_verify_subset(Verify_StringTable)) { 1167 log_debug(gc, verify)("StringTable"); 1168 StringTable::verify(); 1169 } 1170 if (should_verify_subset(Verify_CodeCache)) { 1171 log_debug(gc, verify)("CodeCache"); 1172 CodeCache::verify(); 1173 } 1174 if (should_verify_subset(Verify_SystemDictionary)) { 1175 log_debug(gc, verify)("SystemDictionary"); 1176 SystemDictionary::verify(); 1177 } 1178 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1179 log_debug(gc, verify)("ClassLoaderDataGraph"); 1180 ClassLoaderDataGraph::verify(); 1181 } 1182 if (should_verify_subset(Verify_MetaspaceUtils)) { 1183 log_debug(gc, verify)("MetaspaceUtils"); 1184 DEBUG_ONLY(MetaspaceUtils::verify();) 1185 } 1186 if (should_verify_subset(Verify_JNIHandles)) { 1187 log_debug(gc, verify)("JNIHandles"); 1188 JNIHandles::verify(); 1189 } 1190 if (should_verify_subset(Verify_CodeCacheOops)) { 1191 log_debug(gc, verify)("CodeCache Oops"); 1192 CodeCache::verify_oops(); 1193 } 1194 if (should_verify_subset(Verify_ResolvedMethodTable)) { 1195 log_debug(gc, verify)("ResolvedMethodTable Oops"); 1196 ResolvedMethodTable::verify(); 1197 } 1198 if (should_verify_subset(Verify_StringDedup)) { 1199 log_debug(gc, verify)("String Deduplication"); 1200 StringDedup::verify(); 1201 } 1202 } 1203 1204 1205 #ifndef PRODUCT 1206 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1207 assert(low_boundary < high_boundary, "bad interval"); 1208 1209 // decide which low-order bits we require to be clear: 1210 size_t alignSize = MinObjAlignmentInBytes; 1211 size_t min_object_size = CollectedHeap::min_fill_size(); 1212 1213 // make an inclusive limit: 1214 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1215 uintptr_t min = (uintptr_t)low_boundary; 1216 assert(min < max, "bad interval"); 1217 uintptr_t diff = max ^ min; 1218 1219 // throw away enough low-order bits to make the diff vanish 1220 uintptr_t mask = (uintptr_t)(-1); 1221 while ((mask & diff) != 0) 1222 mask <<= 1; 1223 uintptr_t bits = (min & mask); 1224 assert(bits == (max & mask), "correct mask"); 1225 // check an intermediate value between min and max, just to make sure: 1226 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1227 1228 // require address alignment, too: 1229 mask |= (alignSize - 1); 1230 1231 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1232 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1233 } 1234 _verify_oop_mask = mask; 1235 _verify_oop_bits = bits; 1236 } 1237 1238 // Oop verification (see MacroAssembler::verify_oop) 1239 1240 uintptr_t Universe::verify_oop_mask() { 1241 return _verify_oop_mask; 1242 } 1243 1244 uintptr_t Universe::verify_oop_bits() { 1245 return _verify_oop_bits; 1246 } 1247 1248 uintptr_t Universe::verify_mark_mask() { 1249 return markWord::lock_mask_in_place; 1250 } 1251 1252 uintptr_t Universe::verify_mark_bits() { 1253 intptr_t mask = verify_mark_mask(); 1254 intptr_t bits = (intptr_t)markWord::prototype().value(); 1255 assert((bits & ~mask) == 0, "no stray header bits"); 1256 return bits; 1257 } 1258 #endif // PRODUCT 1259 1260 1261 void LatestMethodCache::init(Klass* k, Method* m) { 1262 if (!UseSharedSpaces) { 1263 _klass = k; 1264 } 1265 #ifndef PRODUCT 1266 else { 1267 // sharing initialization should have already set up _klass 1268 assert(_klass != NULL, "just checking"); 1269 } 1270 #endif 1271 1272 _method_idnum = m->method_idnum(); 1273 assert(_method_idnum >= 0, "sanity check"); 1274 } 1275 1276 1277 Method* LatestMethodCache::get_method() { 1278 if (klass() == NULL) return NULL; 1279 InstanceKlass* ik = InstanceKlass::cast(klass()); 1280 Method* m = ik->method_with_idnum(method_idnum()); 1281 assert(m != NULL, "sanity check"); 1282 return m; 1283 } 1284 1285 #ifdef ASSERT 1286 // Release dummy object(s) at bottom of heap 1287 bool Universe::release_fullgc_alot_dummy() { 1288 MutexLocker ml(FullGCALot_lock); 1289 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve(); 1290 if (fullgc_alot_dummy_array != NULL) { 1291 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) { 1292 // No more dummies to release, release entire array instead 1293 _fullgc_alot_dummy_array.release(Universe::vm_global()); 1294 _fullgc_alot_dummy_array = OopHandle(); // NULL out OopStorage pointer. 1295 return false; 1296 } 1297 1298 // Release dummy at bottom of old generation 1299 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1300 } 1301 return true; 1302 } 1303 1304 bool Universe::is_gc_active() { 1305 return heap()->is_gc_active(); 1306 } 1307 1308 bool Universe::is_in_heap(const void* p) { 1309 return heap()->is_in(p); 1310 } 1311 1312 #endif // ASSERT