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; 137 138 long Universe::verify_flags = Universe::Verify_All; 139 140 Array<int>* Universe::_the_empty_int_array = NULL; 141 Array<u2>* Universe::_the_empty_short_array = NULL; 142 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 143 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL; 144 Array<Method*>* Universe::_the_empty_method_array = NULL; 145 146 // These variables are guarded by FullGCALot_lock. 147 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;) 148 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 149 150 // Heap 151 int Universe::_verify_count = 0; 152 153 // Oop verification (see MacroAssembler::verify_oop) 154 uintptr_t Universe::_verify_oop_mask = 0; 155 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 156 157 int Universe::_base_vtable_size = 0; 158 bool Universe::_bootstrapping = false; 159 bool Universe::_module_initialized = false; 160 bool Universe::_fully_initialized = false; 161 162 OopStorage* Universe::_vm_weak = NULL; 163 OopStorage* Universe::_vm_global = NULL; 164 165 CollectedHeap* Universe::_collectedHeap = NULL; 166 167 objArrayOop Universe::the_empty_class_array () { 168 return (objArrayOop)_the_empty_class_array.resolve(); 169 } 170 171 oop Universe::main_thread_group() { return _main_thread_group.resolve(); } 172 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); } 173 174 oop Universe::system_thread_group() { return _system_thread_group.resolve(); } 175 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); } 176 177 oop Universe::the_null_string() { return _the_null_string.resolve(); } 178 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); } 179 180 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); } 181 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); } 182 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); } 183 184 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); } 185 186 oop Universe::int_mirror() { return check_mirror(_basic_type_mirrors[T_INT].resolve()); } 187 oop Universe::float_mirror() { return check_mirror(_basic_type_mirrors[T_FLOAT].resolve()); } 188 oop Universe::double_mirror() { return check_mirror(_basic_type_mirrors[T_DOUBLE].resolve()); } 189 oop Universe::byte_mirror() { return check_mirror(_basic_type_mirrors[T_BYTE].resolve()); } 190 oop Universe::bool_mirror() { return check_mirror(_basic_type_mirrors[T_BOOLEAN].resolve()); } 191 oop Universe::char_mirror() { return check_mirror(_basic_type_mirrors[T_CHAR].resolve()); } 192 oop Universe::long_mirror() { return check_mirror(_basic_type_mirrors[T_LONG].resolve()); } 193 oop Universe::short_mirror() { return check_mirror(_basic_type_mirrors[T_SHORT].resolve()); } 194 oop Universe::void_mirror() { return check_mirror(_basic_type_mirrors[T_VOID].resolve()); } 195 196 oop Universe::java_mirror(BasicType t) { 197 assert((uint)t < T_VOID+1, "range check"); 198 assert(!is_reference_type(t), "sanity"); 199 return check_mirror(_basic_type_mirrors[t].resolve()); 200 } 201 202 void Universe::basic_type_classes_do(KlassClosure *closure) { 203 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 204 closure->do_klass(_typeArrayKlassObjs[i]); 205 } 206 // We don't do the following because it will confuse JVMTI. 207 // _fillerArrayKlassObj is used only by GC, which doesn't need to see 208 // this klass from basic_type_classes_do(). 209 // 210 // closure->do_klass(_fillerArrayKlassObj); 211 } 212 213 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 214 it->push(&_klass); 215 } 216 217 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 218 it->push(&_fillerArrayKlassObj); 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 #if INCLUDE_CDS_JAVA_HEAP 239 void Universe::set_archived_basic_type_mirror_index(BasicType t, int index) { 240 assert(DumpSharedSpaces, "dump-time only"); 241 assert(!is_reference_type(t), "sanity"); 242 _archived_basic_type_mirror_indices[t] = index; 243 } 244 245 void Universe::update_archived_basic_type_mirrors() { 246 if (ArchiveHeapLoader::are_archived_mirrors_available()) { 247 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 248 int index = _archived_basic_type_mirror_indices[i]; 249 if (!is_reference_type((BasicType)i) && index >= 0) { 250 oop mirror_oop = HeapShared::get_root(index); 251 assert(mirror_oop != NULL, "must be"); 252 _basic_type_mirrors[i] = OopHandle(vm_global(), mirror_oop); 253 } 254 } 255 } 256 } 257 #endif 258 259 void Universe::serialize(SerializeClosure* f) { 260 261 #if INCLUDE_CDS_JAVA_HEAP 262 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 263 f->do_u4((u4*)&_archived_basic_type_mirror_indices[i]); 264 // if f->reading(): We can't call HeapShared::get_root() yet, as the heap 265 // contents may need to be relocated. _basic_type_mirrors[i] will be 266 // updated later in Universe::update_archived_basic_type_mirrors(). 267 } 268 #endif 269 270 f->do_ptr((void**)&_fillerArrayKlassObj); 271 for (int i = 0; i < T_LONG+1; i++) { 272 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 273 } 274 275 f->do_ptr((void**)&_objectArrayKlassObj); 276 f->do_ptr((void**)&_the_array_interfaces_array); 277 f->do_ptr((void**)&_the_empty_int_array); 278 f->do_ptr((void**)&_the_empty_short_array); 279 f->do_ptr((void**)&_the_empty_method_array); 280 f->do_ptr((void**)&_the_empty_klass_array); 281 f->do_ptr((void**)&_the_empty_instance_klass_array); 282 _finalizer_register_cache->serialize(f); 283 _loader_addClass_cache->serialize(f); 284 _throw_illegal_access_error_cache->serialize(f); 285 _throw_no_such_method_error_cache->serialize(f); 286 _do_stack_walk_cache->serialize(f); 287 } 288 289 290 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 291 if (size < alignment || size % alignment != 0) { 292 vm_exit_during_initialization( 293 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 294 } 295 } 296 297 void initialize_basic_type_klass(Klass* k, TRAPS) { 298 Klass* ok = vmClasses::Object_klass(); 299 #if INCLUDE_CDS 300 if (UseSharedSpaces) { 301 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 302 assert(k->super() == ok, "u3"); 303 if (k->is_instance_klass()) { 304 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK); 305 } else { 306 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK); 307 } 308 } else 309 #endif 310 { 311 k->initialize_supers(ok, NULL, CHECK); 312 } 313 k->append_to_sibling_list(); 314 } 315 316 void Universe::genesis(TRAPS) { 317 ResourceMark rm(THREAD); 318 HandleMark hm(THREAD); 319 320 { AutoModifyRestore<bool> temporarily(_bootstrapping, true); 321 322 { MutexLocker mc(THREAD, Compile_lock); 323 324 java_lang_Class::allocate_fixup_lists(); 325 326 // determine base vtable size; without that we cannot create the array klasses 327 compute_base_vtable_size(); 328 329 if (!UseSharedSpaces) { 330 // Initialization of the fillerArrayKlass must come before regular 331 // int-TypeArrayKlass so that the int-Array mirror points to the 332 // int-TypeArrayKlass. 333 _fillerArrayKlassObj = TypeArrayKlass::create_klass(T_INT, "Ljdk/internal/vm/FillerArray;", CHECK); 334 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 335 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 336 } 337 338 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 339 340 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 341 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 342 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 343 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 344 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 345 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 346 } 347 } 348 349 vmSymbols::initialize(); 350 351 SystemDictionary::initialize(CHECK); 352 353 // Create string constants 354 oop s = StringTable::intern("null", CHECK); 355 _the_null_string = OopHandle(vm_global(), s); 356 s = StringTable::intern("-2147483648", CHECK); 357 _the_min_jint_string = OopHandle(vm_global(), s); 358 359 360 #if INCLUDE_CDS 361 if (UseSharedSpaces) { 362 // Verify shared interfaces array. 363 assert(_the_array_interfaces_array->at(0) == 364 vmClasses::Cloneable_klass(), "u3"); 365 assert(_the_array_interfaces_array->at(1) == 366 vmClasses::Serializable_klass(), "u3"); 367 } else 368 #endif 369 { 370 // Set up shared interfaces array. (Do this before supers are set up.) 371 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass()); 372 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass()); 373 } 374 375 initialize_basic_type_klass(_fillerArrayKlassObj, CHECK); 376 377 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 378 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 379 initialize_basic_type_klass(floatArrayKlassObj(), CHECK); 380 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 381 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 382 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 383 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 384 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 385 386 assert(_fillerArrayKlassObj != intArrayKlassObj(), 387 "Internal filler array klass should be different to int array Klass"); 388 } // end of core bootstrapping 389 390 { 391 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 392 _the_null_sentinel = OopHandle(vm_global(), tns()); 393 } 394 395 // Create a handle for reference_pending_list 396 _reference_pending_list = OopHandle(vm_global(), NULL); 397 398 // Maybe this could be lifted up now that object array can be initialized 399 // during the bootstrapping. 400 401 // OLD 402 // Initialize _objectArrayKlass after core bootstraping to make 403 // sure the super class is set up properly for _objectArrayKlass. 404 // --- 405 // NEW 406 // Since some of the old system object arrays have been converted to 407 // ordinary object arrays, _objectArrayKlass will be loaded when 408 // SystemDictionary::initialize(CHECK); is run. See the extra check 409 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 410 _objectArrayKlassObj = InstanceKlass:: 411 cast(vmClasses::Object_klass())->array_klass(1, CHECK); 412 // OLD 413 // Add the class to the class hierarchy manually to make sure that 414 // its vtable is initialized after core bootstrapping is completed. 415 // --- 416 // New 417 // Have already been initialized. 418 _objectArrayKlassObj->append_to_sibling_list(); 419 420 #ifdef ASSERT 421 if (FullGCALot) { 422 // Allocate an array of dummy objects. 423 // We'd like these to be at the bottom of the old generation, 424 // so that when we free one and then collect, 425 // (almost) the whole heap moves 426 // and we find out if we actually update all the oops correctly. 427 // But we can't allocate directly in the old generation, 428 // so we allocate wherever, and hope that the first collection 429 // moves these objects to the bottom of the old generation. 430 int size = FullGCALotDummies * 2; 431 432 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK); 433 objArrayHandle dummy_array(THREAD, naked_array); 434 int i = 0; 435 while (i < size) { 436 // Allocate dummy in old generation 437 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK); 438 dummy_array->obj_at_put(i++, dummy); 439 } 440 { 441 // Only modify the global variable inside the mutex. 442 // If we had a race to here, the other dummy_array instances 443 // and their elements just get dropped on the floor, which is fine. 444 MutexLocker ml(THREAD, FullGCALot_lock); 445 if (_fullgc_alot_dummy_array.is_empty()) { 446 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array()); 447 } 448 } 449 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking"); 450 } 451 #endif 452 } 453 454 void Universe::initialize_basic_type_mirrors(TRAPS) { 455 #if INCLUDE_CDS_JAVA_HEAP 456 if (UseSharedSpaces && 457 ArchiveHeapLoader::are_archived_mirrors_available() && 458 _basic_type_mirrors[T_INT].resolve() != NULL) { 459 assert(ArchiveHeapLoader::can_use(), "Sanity"); 460 461 // check that all basic type mirrors are mapped also 462 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 463 if (!is_reference_type((BasicType)i)) { 464 oop m = _basic_type_mirrors[i].resolve(); 465 assert(m != NULL, "archived mirrors should not be NULL"); 466 } 467 } 468 } else 469 // _basic_type_mirrors[T_INT], etc, are NULL if archived heap is not mapped. 470 #endif 471 { 472 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 473 BasicType bt = (BasicType)i; 474 if (!is_reference_type(bt)) { 475 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK); 476 _basic_type_mirrors[i] = OopHandle(vm_global(), m); 477 } 478 CDS_JAVA_HEAP_ONLY(_archived_basic_type_mirror_indices[i] = -1); 479 } 480 } 481 } 482 483 void Universe::fixup_mirrors(TRAPS) { 484 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 485 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 486 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 487 // that the number of objects allocated at this point is very small. 488 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded"); 489 HandleMark hm(THREAD); 490 491 if (!UseSharedSpaces) { 492 // Cache the start of the static fields 493 InstanceMirrorKlass::init_offset_of_static_fields(); 494 } 495 496 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 497 int list_length = list->length(); 498 for (int i = 0; i < list_length; i++) { 499 Klass* k = list->at(i); 500 assert(k->is_klass(), "List should only hold classes"); 501 java_lang_Class::fixup_mirror(k, CATCH); 502 } 503 delete java_lang_Class::fixup_mirror_list(); 504 java_lang_Class::set_fixup_mirror_list(NULL); 505 } 506 507 #define assert_pll_locked(test) \ 508 assert(Heap_lock->test(), "Reference pending list access requires lock") 509 510 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 511 512 oop Universe::reference_pending_list() { 513 if (Thread::current()->is_VM_thread()) { 514 assert_pll_locked(is_locked); 515 } else { 516 assert_pll_ownership(); 517 } 518 return _reference_pending_list.resolve(); 519 } 520 521 void Universe::clear_reference_pending_list() { 522 assert_pll_ownership(); 523 _reference_pending_list.replace(NULL); 524 } 525 526 bool Universe::has_reference_pending_list() { 527 assert_pll_ownership(); 528 return _reference_pending_list.peek() != NULL; 529 } 530 531 oop Universe::swap_reference_pending_list(oop list) { 532 assert_pll_locked(is_locked); 533 return _reference_pending_list.xchg(list); 534 } 535 536 #undef assert_pll_locked 537 #undef assert_pll_ownership 538 539 static void reinitialize_vtables() { 540 // The vtables are initialized by starting at java.lang.Object and 541 // initializing through the subclass links, so that the super 542 // classes are always initialized first. 543 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) { 544 Klass* sub = iter.klass(); 545 sub->vtable().initialize_vtable(); 546 } 547 } 548 549 static void reinitialize_itables() { 550 551 class ReinitTableClosure : public KlassClosure { 552 public: 553 void do_klass(Klass* k) { 554 if (k->is_instance_klass()) { 555 InstanceKlass::cast(k)->itable().initialize_itable(); 556 } 557 } 558 }; 559 560 MutexLocker mcld(ClassLoaderDataGraph_lock); 561 ReinitTableClosure cl; 562 ClassLoaderDataGraph::classes_do(&cl); 563 } 564 565 bool Universe::on_page_boundary(void* addr) { 566 return is_aligned(addr, os::vm_page_size()); 567 } 568 569 // the array of preallocated errors with backtraces 570 objArrayOop Universe::preallocated_out_of_memory_errors() { 571 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve(); 572 } 573 574 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); } 575 576 oop Universe::out_of_memory_error_java_heap() { 577 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap)); 578 } 579 580 oop Universe::out_of_memory_error_c_heap() { 581 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap)); 582 } 583 584 oop Universe::out_of_memory_error_metaspace() { 585 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace)); 586 } 587 588 oop Universe::out_of_memory_error_class_metaspace() { 589 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace)); 590 } 591 592 oop Universe::out_of_memory_error_array_size() { 593 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size)); 594 } 595 596 oop Universe::out_of_memory_error_gc_overhead_limit() { 597 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit)); 598 } 599 600 oop Universe::out_of_memory_error_realloc_objects() { 601 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects)); 602 } 603 604 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM 605 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); } 606 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); } 607 608 609 bool Universe::should_fill_in_stack_trace(Handle throwable) { 610 // never attempt to fill in the stack trace of preallocated errors that do not have 611 // backtrace. These errors are kept alive forever and may be "re-used" when all 612 // preallocated errors with backtrace have been consumed. Also need to avoid 613 // a potential loop which could happen if an out of memory occurs when attempting 614 // to allocate the backtrace. 615 objArrayOop preallocated_oom = out_of_memory_errors(); 616 for (int i = 0; i < _oom_count; i++) { 617 if (throwable() == preallocated_oom->obj_at(i)) { 618 return false; 619 } 620 } 621 return true; 622 } 623 624 625 oop Universe::gen_out_of_memory_error(oop default_err) { 626 // generate an out of memory error: 627 // - if there is a preallocated error and stack traces are available 628 // (j.l.Throwable is initialized), then return the preallocated 629 // error with a filled in stack trace, and with the message 630 // provided by the default error. 631 // - otherwise, return the default error, without a stack trace. 632 int next; 633 if ((_preallocated_out_of_memory_error_avail_count > 0) && 634 vmClasses::Throwable_klass()->is_initialized()) { 635 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1); 636 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 637 } else { 638 next = -1; 639 } 640 if (next < 0) { 641 // all preallocated errors have been used. 642 // return default 643 return default_err; 644 } else { 645 JavaThread* current = JavaThread::current(); 646 Handle default_err_h(current, default_err); 647 // get the error object at the slot and set set it to NULL so that the 648 // array isn't keeping it alive anymore. 649 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next)); 650 assert(exc() != NULL, "slot has been used already"); 651 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 652 653 // use the message from the default error 654 oop msg = java_lang_Throwable::message(default_err_h()); 655 assert(msg != NULL, "no message"); 656 java_lang_Throwable::set_message(exc(), msg); 657 658 // populate the stack trace and return it. 659 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 660 return exc(); 661 } 662 } 663 664 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) { 665 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve(); 666 } 667 668 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) { 669 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve(); 670 } 671 672 // Setup preallocated OutOfMemoryError errors 673 void Universe::create_preallocated_out_of_memory_errors(TRAPS) { 674 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass(); 675 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK); 676 objArrayHandle oom_array(THREAD, oa); 677 678 for (int i = 0; i < _oom_count; i++) { 679 oop oom_obj = ik->allocate_instance(CHECK); 680 oom_array->obj_at_put(i, oom_obj); 681 } 682 _out_of_memory_errors = OopHandle(vm_global(), oom_array()); 683 684 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK); 685 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg()); 686 687 msg = java_lang_String::create_from_str("C heap space", CHECK); 688 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg()); 689 690 msg = java_lang_String::create_from_str("Metaspace", CHECK); 691 _msg_metaspace = OopHandle(vm_global(), msg()); 692 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg()); 693 694 msg = java_lang_String::create_from_str("Compressed class space", CHECK); 695 _msg_class_metaspace = OopHandle(vm_global(), msg()); 696 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg()); 697 698 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK); 699 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg()); 700 701 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK); 702 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg()); 703 704 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK); 705 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg()); 706 707 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK); 708 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg()); 709 710 // Setup the array of errors that have preallocated backtrace 711 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 712 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK); 713 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance); 714 objArrayHandle preallocated_oom_array(THREAD, instance); 715 716 for (int i=0; i<len; i++) { 717 oop err = ik->allocate_instance(CHECK); 718 Handle err_h(THREAD, err); 719 java_lang_Throwable::allocate_backtrace(err_h, CHECK); 720 preallocated_oom_array->obj_at_put(i, err_h()); 721 } 722 _preallocated_out_of_memory_error_avail_count = (jint)len; 723 } 724 725 intptr_t Universe::_non_oop_bits = 0; 726 727 void* Universe::non_oop_word() { 728 // Neither the high bits nor the low bits of this value is allowed 729 // to look like (respectively) the high or low bits of a real oop. 730 // 731 // High and low are CPU-specific notions, but low always includes 732 // the low-order bit. Since oops are always aligned at least mod 4, 733 // setting the low-order bit will ensure that the low half of the 734 // word will never look like that of a real oop. 735 // 736 // Using the OS-supplied non-memory-address word (usually 0 or -1) 737 // will take care of the high bits, however many there are. 738 739 if (_non_oop_bits == 0) { 740 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 741 } 742 743 return (void*)_non_oop_bits; 744 } 745 746 bool Universe::contains_non_oop_word(void* p) { 747 return *(void**)p == non_oop_word(); 748 } 749 750 static void initialize_global_behaviours() { 751 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour()); 752 } 753 754 jint universe_init() { 755 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 756 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 757 "LogHeapWordSize is incorrect."); 758 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 759 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 760 "oop size is not not a multiple of HeapWord size"); 761 762 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 763 764 initialize_global_behaviours(); 765 766 GCLogPrecious::initialize(); 767 768 #ifdef _LP64 769 MetaspaceShared::adjust_heap_sizes_for_dumping(); 770 #endif // _LP64 771 772 GCConfig::arguments()->initialize_heap_sizes(); 773 774 jint status = Universe::initialize_heap(); 775 if (status != JNI_OK) { 776 return status; 777 } 778 779 Universe::initialize_tlab(); 780 781 Metaspace::global_initialize(); 782 783 // Initialize performance counters for metaspaces 784 MetaspaceCounters::initialize_performance_counters(); 785 786 // Checks 'AfterMemoryInit' constraints. 787 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) { 788 return JNI_EINVAL; 789 } 790 791 // Create memory for metadata. Must be after initializing heap for 792 // DumpSharedSpaces. 793 ClassLoaderData::init_null_class_loader_data(); 794 795 // We have a heap so create the Method* caches before 796 // Metaspace::initialize_shared_spaces() tries to populate them. 797 Universe::_finalizer_register_cache = new LatestMethodCache(); 798 Universe::_loader_addClass_cache = new LatestMethodCache(); 799 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 800 Universe::_throw_no_such_method_error_cache = new LatestMethodCache(); 801 Universe::_do_stack_walk_cache = new LatestMethodCache(); 802 803 #if INCLUDE_CDS 804 DynamicArchive::check_for_dynamic_dump(); 805 if (UseSharedSpaces) { 806 // Read the data structures supporting the shared spaces (shared 807 // system dictionary, symbol table, etc.). After that, access to 808 // the file (other than the mapped regions) is no longer needed, and 809 // the file is closed. Closing the file does not affect the 810 // currently mapped regions. 811 MetaspaceShared::initialize_shared_spaces(); 812 StringTable::create_table(); 813 if (ArchiveHeapLoader::is_loaded()) { 814 StringTable::transfer_shared_strings_to_local_table(); 815 } 816 } else 817 #endif 818 { 819 SymbolTable::create_table(); 820 StringTable::create_table(); 821 } 822 823 #if INCLUDE_CDS 824 if (Arguments::is_dumping_archive()) { 825 MetaspaceShared::prepare_for_dumping(); 826 } 827 #endif 828 829 if (strlen(VerifySubSet) > 0) { 830 Universe::initialize_verify_flags(); 831 } 832 833 ResolvedMethodTable::create_table(); 834 835 return JNI_OK; 836 } 837 838 jint Universe::initialize_heap() { 839 assert(_collectedHeap == NULL, "Heap already created"); 840 _collectedHeap = GCConfig::arguments()->create_heap(); 841 842 log_info(gc)("Using %s", _collectedHeap->name()); 843 return _collectedHeap->initialize(); 844 } 845 846 void Universe::initialize_tlab() { 847 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 848 PLAB::startup_initialization(); 849 if (UseTLAB) { 850 ThreadLocalAllocBuffer::startup_initialization(); 851 } 852 } 853 854 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 855 856 assert(alignment <= Arguments::conservative_max_heap_alignment(), 857 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 858 alignment, Arguments::conservative_max_heap_alignment()); 859 860 size_t total_reserved = align_up(heap_size, alignment); 861 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 862 "heap size is too big for compressed oops"); 863 864 size_t page_size = os::vm_page_size(); 865 if (UseLargePages && is_aligned(alignment, os::large_page_size())) { 866 page_size = os::large_page_size(); 867 } else { 868 // Parallel is the only collector that might opt out of using large pages 869 // for the heap. 870 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages"); 871 } 872 873 // Now create the space. 874 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt); 875 876 if (total_rs.is_reserved()) { 877 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 878 "must be exactly of required size and alignment"); 879 // We are good. 880 881 if (AllocateHeapAt != NULL) { 882 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 883 } 884 885 if (UseCompressedOops) { 886 CompressedOops::initialize(total_rs); 887 } 888 889 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end()); 890 891 return total_rs; 892 } 893 894 vm_exit_during_initialization( 895 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 896 total_reserved/K)); 897 898 // satisfy compiler 899 ShouldNotReachHere(); 900 return ReservedHeapSpace(0, 0, os::vm_page_size()); 901 } 902 903 OopStorage* Universe::vm_weak() { 904 return Universe::_vm_weak; 905 } 906 907 OopStorage* Universe::vm_global() { 908 return Universe::_vm_global; 909 } 910 911 void Universe::oopstorage_init() { 912 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal); 913 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal); 914 } 915 916 void universe_oopstorage_init() { 917 Universe::oopstorage_init(); 918 } 919 920 void initialize_known_method(LatestMethodCache* method_cache, 921 InstanceKlass* ik, 922 const char* method, 923 Symbol* signature, 924 bool is_static, TRAPS) 925 { 926 TempNewSymbol name = SymbolTable::new_symbol(method); 927 Method* m = NULL; 928 // The klass must be linked before looking up the method. 929 if (!ik->link_class_or_fail(THREAD) || 930 ((m = ik->find_method(name, signature)) == NULL) || 931 is_static != m->is_static()) { 932 ResourceMark rm(THREAD); 933 // NoSuchMethodException doesn't actually work because it tries to run the 934 // <init> function before java_lang_Class is linked. Print error and exit. 935 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 936 ik->name()->as_C_string(), method)); 937 } 938 method_cache->init(ik, m); 939 } 940 941 void Universe::initialize_known_methods(TRAPS) { 942 // Set up static method for registering finalizers 943 initialize_known_method(_finalizer_register_cache, 944 vmClasses::Finalizer_klass(), 945 "register", 946 vmSymbols::object_void_signature(), true, CHECK); 947 948 initialize_known_method(_throw_illegal_access_error_cache, 949 vmClasses::internal_Unsafe_klass(), 950 "throwIllegalAccessError", 951 vmSymbols::void_method_signature(), true, CHECK); 952 953 initialize_known_method(_throw_no_such_method_error_cache, 954 vmClasses::internal_Unsafe_klass(), 955 "throwNoSuchMethodError", 956 vmSymbols::void_method_signature(), true, CHECK); 957 958 // Set up method for registering loaded classes in class loader vector 959 initialize_known_method(_loader_addClass_cache, 960 vmClasses::ClassLoader_klass(), 961 "addClass", 962 vmSymbols::class_void_signature(), false, CHECK); 963 964 // Set up method for stack walking 965 initialize_known_method(_do_stack_walk_cache, 966 vmClasses::AbstractStackWalker_klass(), 967 "doStackWalk", 968 vmSymbols::doStackWalk_signature(), false, CHECK); 969 } 970 971 void universe2_init() { 972 EXCEPTION_MARK; 973 Universe::genesis(CATCH); 974 } 975 976 // Set after initialization of the module runtime, call_initModuleRuntime 977 void universe_post_module_init() { 978 Universe::_module_initialized = true; 979 } 980 981 bool universe_post_init() { 982 assert(!is_init_completed(), "Error: initialization not yet completed!"); 983 Universe::_fully_initialized = true; 984 EXCEPTION_MARK; 985 if (!UseSharedSpaces) { 986 reinitialize_vtables(); 987 reinitialize_itables(); 988 } 989 990 HandleMark hm(THREAD); 991 // Setup preallocated empty java.lang.Class array for Method reflection. 992 993 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false); 994 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array); 995 996 // Setup preallocated OutOfMemoryError errors 997 Universe::create_preallocated_out_of_memory_errors(CHECK_false); 998 999 oop instance; 1000 // Setup preallocated cause message for delayed StackOverflowError 1001 if (StackReservedPages > 0) { 1002 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 1003 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance); 1004 } 1005 1006 // Setup preallocated NullPointerException 1007 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1008 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1009 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1010 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance); 1011 1012 // Setup preallocated ArithmeticException 1013 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1014 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1015 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1016 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance); 1017 1018 // Virtual Machine Error for when we get into a situation we can't resolve 1019 k = vmClasses::VirtualMachineError_klass(); 1020 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1021 if (!linked) { 1022 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1023 return false; // initialization failed 1024 } 1025 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1026 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance); 1027 1028 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1029 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg()); 1030 1031 Universe::initialize_known_methods(CHECK_false); 1032 1033 // This needs to be done before the first scavenge/gc, since 1034 // it's an input to soft ref clearing policy. 1035 { 1036 MutexLocker x(THREAD, Heap_lock); 1037 Universe::heap()->update_capacity_and_used_at_gc(); 1038 } 1039 1040 // ("weak") refs processing infrastructure initialization 1041 Universe::heap()->post_initialize(); 1042 1043 MemoryService::add_metaspace_memory_pools(); 1044 1045 MemoryService::set_universe_heap(Universe::heap()); 1046 #if INCLUDE_CDS 1047 MetaspaceShared::post_initialize(CHECK_false); 1048 #endif 1049 return true; 1050 } 1051 1052 1053 void Universe::compute_base_vtable_size() { 1054 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1055 } 1056 1057 void Universe::print_on(outputStream* st) { 1058 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1059 st->print_cr("Heap"); 1060 heap()->print_on(st); 1061 } 1062 1063 void Universe::print_heap_at_SIGBREAK() { 1064 if (PrintHeapAtSIGBREAK) { 1065 print_on(tty); 1066 tty->cr(); 1067 tty->flush(); 1068 } 1069 } 1070 1071 void Universe::initialize_verify_flags() { 1072 verify_flags = 0; 1073 const char delimiter[] = " ,"; 1074 1075 size_t length = strlen(VerifySubSet); 1076 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1077 strncpy(subset_list, VerifySubSet, length + 1); 1078 char* save_ptr; 1079 1080 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1081 while (token != NULL) { 1082 if (strcmp(token, "threads") == 0) { 1083 verify_flags |= Verify_Threads; 1084 } else if (strcmp(token, "heap") == 0) { 1085 verify_flags |= Verify_Heap; 1086 } else if (strcmp(token, "symbol_table") == 0) { 1087 verify_flags |= Verify_SymbolTable; 1088 } else if (strcmp(token, "string_table") == 0) { 1089 verify_flags |= Verify_StringTable; 1090 } else if (strcmp(token, "codecache") == 0) { 1091 verify_flags |= Verify_CodeCache; 1092 } else if (strcmp(token, "dictionary") == 0) { 1093 verify_flags |= Verify_SystemDictionary; 1094 } else if (strcmp(token, "classloader_data_graph") == 0) { 1095 verify_flags |= Verify_ClassLoaderDataGraph; 1096 } else if (strcmp(token, "metaspace") == 0) { 1097 verify_flags |= Verify_MetaspaceUtils; 1098 } else if (strcmp(token, "jni_handles") == 0) { 1099 verify_flags |= Verify_JNIHandles; 1100 } else if (strcmp(token, "codecache_oops") == 0) { 1101 verify_flags |= Verify_CodeCacheOops; 1102 } else if (strcmp(token, "resolved_method_table") == 0) { 1103 verify_flags |= Verify_ResolvedMethodTable; 1104 } else if (strcmp(token, "stringdedup") == 0) { 1105 verify_flags |= Verify_StringDedup; 1106 } else { 1107 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1108 } 1109 token = strtok_r(NULL, delimiter, &save_ptr); 1110 } 1111 FREE_C_HEAP_ARRAY(char, subset_list); 1112 } 1113 1114 bool Universe::should_verify_subset(uint subset) { 1115 if (verify_flags & subset) { 1116 return true; 1117 } 1118 return false; 1119 } 1120 1121 void Universe::verify(VerifyOption option, const char* prefix) { 1122 COMPILER2_PRESENT( 1123 assert(!DerivedPointerTable::is_active(), 1124 "DPT should not be active during verification " 1125 "(of thread stacks below)"); 1126 ) 1127 1128 Thread* thread = Thread::current(); 1129 ResourceMark rm(thread); 1130 HandleMark hm(thread); // Handles created during verification can be zapped 1131 _verify_count++; 1132 1133 FormatBuffer<> title("Verifying %s", prefix); 1134 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1135 if (should_verify_subset(Verify_Threads)) { 1136 log_debug(gc, verify)("Threads"); 1137 Threads::verify(); 1138 } 1139 if (should_verify_subset(Verify_Heap)) { 1140 log_debug(gc, verify)("Heap"); 1141 heap()->verify(option); 1142 } 1143 if (should_verify_subset(Verify_SymbolTable)) { 1144 log_debug(gc, verify)("SymbolTable"); 1145 SymbolTable::verify(); 1146 } 1147 if (should_verify_subset(Verify_StringTable)) { 1148 log_debug(gc, verify)("StringTable"); 1149 StringTable::verify(); 1150 } 1151 if (should_verify_subset(Verify_CodeCache)) { 1152 log_debug(gc, verify)("CodeCache"); 1153 CodeCache::verify(); 1154 } 1155 if (should_verify_subset(Verify_SystemDictionary)) { 1156 log_debug(gc, verify)("SystemDictionary"); 1157 SystemDictionary::verify(); 1158 } 1159 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1160 log_debug(gc, verify)("ClassLoaderDataGraph"); 1161 ClassLoaderDataGraph::verify(); 1162 } 1163 if (should_verify_subset(Verify_MetaspaceUtils)) { 1164 log_debug(gc, verify)("MetaspaceUtils"); 1165 DEBUG_ONLY(MetaspaceUtils::verify();) 1166 } 1167 if (should_verify_subset(Verify_JNIHandles)) { 1168 log_debug(gc, verify)("JNIHandles"); 1169 JNIHandles::verify(); 1170 } 1171 if (should_verify_subset(Verify_CodeCacheOops)) { 1172 log_debug(gc, verify)("CodeCache Oops"); 1173 CodeCache::verify_oops(); 1174 } 1175 if (should_verify_subset(Verify_ResolvedMethodTable)) { 1176 log_debug(gc, verify)("ResolvedMethodTable Oops"); 1177 ResolvedMethodTable::verify(); 1178 } 1179 if (should_verify_subset(Verify_StringDedup)) { 1180 log_debug(gc, verify)("String Deduplication"); 1181 StringDedup::verify(); 1182 } 1183 } 1184 1185 1186 #ifndef PRODUCT 1187 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1188 assert(low_boundary < high_boundary, "bad interval"); 1189 1190 // decide which low-order bits we require to be clear: 1191 size_t alignSize = MinObjAlignmentInBytes; 1192 size_t min_object_size = CollectedHeap::min_fill_size(); 1193 1194 // make an inclusive limit: 1195 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1196 uintptr_t min = (uintptr_t)low_boundary; 1197 assert(min < max, "bad interval"); 1198 uintptr_t diff = max ^ min; 1199 1200 // throw away enough low-order bits to make the diff vanish 1201 uintptr_t mask = (uintptr_t)(-1); 1202 while ((mask & diff) != 0) 1203 mask <<= 1; 1204 uintptr_t bits = (min & mask); 1205 assert(bits == (max & mask), "correct mask"); 1206 // check an intermediate value between min and max, just to make sure: 1207 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1208 1209 // require address alignment, too: 1210 mask |= (alignSize - 1); 1211 1212 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1213 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1214 } 1215 _verify_oop_mask = mask; 1216 _verify_oop_bits = bits; 1217 } 1218 1219 // Oop verification (see MacroAssembler::verify_oop) 1220 1221 uintptr_t Universe::verify_oop_mask() { 1222 return _verify_oop_mask; 1223 } 1224 1225 uintptr_t Universe::verify_oop_bits() { 1226 return _verify_oop_bits; 1227 } 1228 1229 uintptr_t Universe::verify_mark_mask() { 1230 return markWord::lock_mask_in_place; 1231 } 1232 1233 uintptr_t Universe::verify_mark_bits() { 1234 intptr_t mask = verify_mark_mask(); 1235 intptr_t bits = (intptr_t)markWord::prototype().value(); 1236 assert((bits & ~mask) == 0, "no stray header bits"); 1237 return bits; 1238 } 1239 #endif // PRODUCT 1240 1241 1242 void LatestMethodCache::init(Klass* k, Method* m) { 1243 if (!UseSharedSpaces) { 1244 _klass = k; 1245 } 1246 #ifndef PRODUCT 1247 else { 1248 // sharing initialization should have already set up _klass 1249 assert(_klass != NULL, "just checking"); 1250 } 1251 #endif 1252 1253 _method_idnum = m->method_idnum(); 1254 assert(_method_idnum >= 0, "sanity check"); 1255 } 1256 1257 1258 Method* LatestMethodCache::get_method() { 1259 if (klass() == NULL) return NULL; 1260 InstanceKlass* ik = InstanceKlass::cast(klass()); 1261 Method* m = ik->method_with_idnum(method_idnum()); 1262 assert(m != NULL, "sanity check"); 1263 return m; 1264 } 1265 1266 #ifdef ASSERT 1267 // Release dummy object(s) at bottom of heap 1268 bool Universe::release_fullgc_alot_dummy() { 1269 MutexLocker ml(FullGCALot_lock); 1270 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve(); 1271 if (fullgc_alot_dummy_array != NULL) { 1272 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) { 1273 // No more dummies to release, release entire array instead 1274 _fullgc_alot_dummy_array.release(Universe::vm_global()); 1275 _fullgc_alot_dummy_array = OopHandle(); // NULL out OopStorage pointer. 1276 return false; 1277 } 1278 1279 // Release dummy at bottom of old generation 1280 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1281 } 1282 return true; 1283 } 1284 1285 bool Universe::is_gc_active() { 1286 return heap()->is_gc_active(); 1287 } 1288 1289 bool Universe::is_in_heap(const void* p) { 1290 return heap()->is_in(p); 1291 } 1292 1293 #endif // ASSERT