1 /* 2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "aot/aotLoader.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/classLoaderDataGraph.hpp" 29 #include "classfile/javaClasses.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/symbolTable.hpp" 32 #include "classfile/systemDictionary.hpp" 33 #include "classfile/vmSymbols.hpp" 34 #include "code/codeBehaviours.hpp" 35 #include "code/codeCache.hpp" 36 #include "gc/shared/collectedHeap.inline.hpp" 37 #include "gc/shared/gcArguments.hpp" 38 #include "gc/shared/gcConfig.hpp" 39 #include "gc/shared/gcLogPrecious.hpp" 40 #include "gc/shared/gcTraceTime.inline.hpp" 41 #include "gc/shared/oopStorageSet.hpp" 42 #include "logging/log.hpp" 43 #include "logging/logStream.hpp" 44 #include "memory/heapShared.hpp" 45 #include "memory/metadataFactory.hpp" 46 #include "memory/metaspaceClosure.hpp" 47 #include "memory/metaspaceCounters.hpp" 48 #include "memory/metaspaceShared.hpp" 49 #include "memory/oopFactory.hpp" 50 #include "memory/resourceArea.hpp" 51 #include "memory/universe.hpp" 52 #include "oops/compressedOops.hpp" 53 #include "oops/instanceKlass.hpp" 54 #include "oops/instanceMirrorKlass.hpp" 55 #include "oops/objArrayOop.inline.hpp" 56 #include "oops/oop.inline.hpp" 57 #include "oops/oopHandle.inline.hpp" 58 #include "oops/typeArrayKlass.hpp" 59 #include "prims/resolvedMethodTable.hpp" 60 #include "runtime/arguments.hpp" 61 #include "runtime/atomic.hpp" 62 #include "runtime/flags/jvmFlagConstraintList.hpp" 63 #include "runtime/handles.inline.hpp" 64 #include "runtime/init.hpp" 65 #include "runtime/java.hpp" 66 #include "runtime/thread.inline.hpp" 67 #include "runtime/timerTrace.hpp" 68 #include "services/memoryService.hpp" 69 #include "utilities/align.hpp" 70 #include "utilities/autoRestore.hpp" 71 #include "utilities/debug.hpp" 72 #include "utilities/formatBuffer.hpp" 73 #include "utilities/macros.hpp" 74 #include "utilities/ostream.hpp" 75 #include "utilities/preserveException.hpp" 76 77 // Known objects 78 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ }; 79 Klass* Universe::_objectArrayKlassObj = NULL; 80 OopHandle Universe::_mirrors[T_VOID+1]; 81 82 OopHandle Universe::_main_thread_group; 83 OopHandle Universe::_system_thread_group; 84 OopHandle Universe::_the_empty_class_array; 85 OopHandle Universe::_the_null_string; 86 OopHandle Universe::_the_min_jint_string; 87 88 OopHandle Universe::_the_null_sentinel; 89 90 // _out_of_memory_errors is an objArray 91 enum OutOfMemoryInstance { _oom_java_heap, 92 _oom_c_heap, 93 _oom_metaspace, 94 _oom_class_metaspace, 95 _oom_array_size, 96 _oom_gc_overhead_limit, 97 _oom_realloc_objects, 98 _oom_retry, 99 _oom_count }; 100 101 OopHandle Universe::_out_of_memory_errors; 102 OopHandle Universe::_delayed_stack_overflow_error_message; 103 OopHandle Universe::_preallocated_out_of_memory_error_array; 104 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 105 106 OopHandle Universe::_null_ptr_exception_instance; 107 OopHandle Universe::_arithmetic_exception_instance; 108 OopHandle Universe::_virtual_machine_error_instance; 109 110 OopHandle Universe::_reference_pending_list; 111 112 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 113 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 114 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 115 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 116 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL; 117 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 118 119 bool Universe::_verify_in_progress = false; 120 long Universe::verify_flags = Universe::Verify_All; 121 122 Array<int>* Universe::_the_empty_int_array = NULL; 123 Array<u2>* Universe::_the_empty_short_array = NULL; 124 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 125 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL; 126 Array<Method*>* Universe::_the_empty_method_array = NULL; 127 128 // These variables are guarded by FullGCALot_lock. 129 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;) 130 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 131 132 // Heap 133 int Universe::_verify_count = 0; 134 135 // Oop verification (see MacroAssembler::verify_oop) 136 uintptr_t Universe::_verify_oop_mask = 0; 137 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 138 139 int Universe::_base_vtable_size = 0; 140 bool Universe::_bootstrapping = false; 141 bool Universe::_module_initialized = false; 142 bool Universe::_fully_initialized = false; 143 144 size_t Universe::_heap_capacity_at_last_gc; 145 size_t Universe::_heap_used_at_last_gc = 0; 146 147 OopStorage* Universe::_vm_weak = NULL; 148 OopStorage* Universe::_vm_global = NULL; 149 150 CollectedHeap* Universe::_collectedHeap = NULL; 151 152 objArrayOop Universe::the_empty_class_array () { 153 return (objArrayOop)_the_empty_class_array.resolve(); 154 } 155 156 oop Universe::main_thread_group() { return _main_thread_group.resolve(); } 157 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); } 158 159 oop Universe::system_thread_group() { return _system_thread_group.resolve(); } 160 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); } 161 162 oop Universe::the_null_string() { return _the_null_string.resolve(); } 163 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); } 164 165 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); } 166 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); } 167 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); } 168 169 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); } 170 171 oop Universe::int_mirror() { return check_mirror(_mirrors[T_INT].resolve()); } 172 oop Universe::float_mirror() { return check_mirror(_mirrors[T_FLOAT].resolve()); } 173 oop Universe::double_mirror() { return check_mirror(_mirrors[T_DOUBLE].resolve()); } 174 oop Universe::byte_mirror() { return check_mirror(_mirrors[T_BYTE].resolve()); } 175 oop Universe::bool_mirror() { return check_mirror(_mirrors[T_BOOLEAN].resolve()); } 176 oop Universe::char_mirror() { return check_mirror(_mirrors[T_CHAR].resolve()); } 177 oop Universe::long_mirror() { return check_mirror(_mirrors[T_LONG].resolve()); } 178 oop Universe::short_mirror() { return check_mirror(_mirrors[T_SHORT].resolve()); } 179 oop Universe::void_mirror() { return check_mirror(_mirrors[T_VOID].resolve()); } 180 181 oop Universe::java_mirror(BasicType t) { 182 assert((uint)t < T_VOID+1, "range check"); 183 return check_mirror(_mirrors[t].resolve()); 184 } 185 186 // Used by CDS dumping 187 void Universe::replace_mirror(BasicType t, oop new_mirror) { 188 Universe::_mirrors[t].replace(new_mirror); 189 } 190 191 // Not sure why CDS has to do this 192 void Universe::clear_basic_type_mirrors() { 193 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 194 if (!is_reference_type((BasicType)i)) { 195 Universe::_mirrors[i].replace(NULL); 196 } 197 } 198 } 199 200 void Universe::basic_type_classes_do(void f(Klass*)) { 201 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 202 f(_typeArrayKlassObjs[i]); 203 } 204 } 205 206 void Universe::basic_type_classes_do(KlassClosure *closure) { 207 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 208 closure->do_klass(_typeArrayKlassObjs[i]); 209 } 210 } 211 212 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 213 it->push(&_klass); 214 } 215 216 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 217 for (int i = 0; i < T_LONG+1; i++) { 218 it->push(&_typeArrayKlassObjs[i]); 219 } 220 it->push(&_objectArrayKlassObj); 221 222 it->push(&_the_empty_int_array); 223 it->push(&_the_empty_short_array); 224 it->push(&_the_empty_klass_array); 225 it->push(&_the_empty_instance_klass_array); 226 it->push(&_the_empty_method_array); 227 it->push(&_the_array_interfaces_array); 228 229 _finalizer_register_cache->metaspace_pointers_do(it); 230 _loader_addClass_cache->metaspace_pointers_do(it); 231 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 232 _throw_no_such_method_error_cache->metaspace_pointers_do(it); 233 _do_stack_walk_cache->metaspace_pointers_do(it); 234 } 235 236 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive 237 void Universe::serialize(SerializeClosure* f) { 238 239 #if INCLUDE_CDS_JAVA_HEAP 240 { 241 oop mirror_oop; 242 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 243 if (f->reading()) { 244 f->do_oop(&mirror_oop); // read from archive 245 assert(oopDesc::is_oop_or_null(mirror_oop), "is oop"); 246 // Only create an OopHandle for non-null mirrors 247 if (mirror_oop != NULL) { 248 _mirrors[i] = OopHandle(vm_global(), mirror_oop); 249 } 250 } else { 251 mirror_oop = _mirrors[i].resolve(); 252 f->do_oop(&mirror_oop); // write to archive 253 } 254 if (mirror_oop != NULL) { // may be null if archived heap is disabled 255 java_lang_Class::update_archived_primitive_mirror_native_pointers(mirror_oop); 256 } 257 } 258 } 259 #endif 260 261 for (int i = 0; i < T_LONG+1; i++) { 262 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 263 } 264 265 f->do_ptr((void**)&_objectArrayKlassObj); 266 f->do_ptr((void**)&_the_array_interfaces_array); 267 f->do_ptr((void**)&_the_empty_int_array); 268 f->do_ptr((void**)&_the_empty_short_array); 269 f->do_ptr((void**)&_the_empty_method_array); 270 f->do_ptr((void**)&_the_empty_klass_array); 271 f->do_ptr((void**)&_the_empty_instance_klass_array); 272 _finalizer_register_cache->serialize(f); 273 _loader_addClass_cache->serialize(f); 274 _throw_illegal_access_error_cache->serialize(f); 275 _throw_no_such_method_error_cache->serialize(f); 276 _do_stack_walk_cache->serialize(f); 277 } 278 279 280 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 281 if (size < alignment || size % alignment != 0) { 282 vm_exit_during_initialization( 283 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 284 } 285 } 286 287 void initialize_basic_type_klass(Klass* k, TRAPS) { 288 Klass* ok = SystemDictionary::Object_klass(); 289 #if INCLUDE_CDS 290 if (UseSharedSpaces) { 291 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 292 assert(k->super() == ok, "u3"); 293 if (k->is_instance_klass()) { 294 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK); 295 } else { 296 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK); 297 } 298 } else 299 #endif 300 { 301 k->initialize_supers(ok, NULL, CHECK); 302 } 303 k->append_to_sibling_list(); 304 } 305 306 void Universe::genesis(TRAPS) { 307 ResourceMark rm(THREAD); 308 HandleMark hm(THREAD); 309 310 { AutoModifyRestore<bool> temporarily(_bootstrapping, true); 311 312 { MutexLocker mc(THREAD, Compile_lock); 313 314 java_lang_Class::allocate_fixup_lists(); 315 316 // determine base vtable size; without that we cannot create the array klasses 317 compute_base_vtable_size(); 318 319 if (!UseSharedSpaces) { 320 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 321 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 322 } 323 324 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 325 326 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 327 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 328 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 329 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 330 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 331 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 332 } 333 } 334 335 vmSymbols::initialize(CHECK); 336 337 SystemDictionary::initialize(CHECK); 338 339 // Create string constants 340 oop s = StringTable::intern("null", CHECK); 341 _the_null_string = OopHandle(vm_global(), s); 342 s = StringTable::intern("-2147483648", CHECK); 343 _the_min_jint_string = OopHandle(vm_global(), s); 344 345 346 #if INCLUDE_CDS 347 if (UseSharedSpaces) { 348 // Verify shared interfaces array. 349 assert(_the_array_interfaces_array->at(0) == 350 SystemDictionary::Cloneable_klass(), "u3"); 351 assert(_the_array_interfaces_array->at(1) == 352 SystemDictionary::Serializable_klass(), "u3"); 353 } else 354 #endif 355 { 356 // Set up shared interfaces array. (Do this before supers are set up.) 357 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 358 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 359 } 360 361 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 362 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 363 initialize_basic_type_klass(floatArrayKlassObj(), CHECK); 364 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 365 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 366 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 367 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 368 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 369 } // end of core bootstrapping 370 371 { 372 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 373 _the_null_sentinel = OopHandle(vm_global(), tns()); 374 } 375 376 // Create a handle for reference_pending_list 377 _reference_pending_list = OopHandle(vm_global(), NULL); 378 379 // Maybe this could be lifted up now that object array can be initialized 380 // during the bootstrapping. 381 382 // OLD 383 // Initialize _objectArrayKlass after core bootstraping to make 384 // sure the super class is set up properly for _objectArrayKlass. 385 // --- 386 // NEW 387 // Since some of the old system object arrays have been converted to 388 // ordinary object arrays, _objectArrayKlass will be loaded when 389 // SystemDictionary::initialize(CHECK); is run. See the extra check 390 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 391 _objectArrayKlassObj = InstanceKlass:: 392 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 393 // OLD 394 // Add the class to the class hierarchy manually to make sure that 395 // its vtable is initialized after core bootstrapping is completed. 396 // --- 397 // New 398 // Have already been initialized. 399 _objectArrayKlassObj->append_to_sibling_list(); 400 401 #ifdef ASSERT 402 if (FullGCALot) { 403 // Allocate an array of dummy objects. 404 // We'd like these to be at the bottom of the old generation, 405 // so that when we free one and then collect, 406 // (almost) the whole heap moves 407 // and we find out if we actually update all the oops correctly. 408 // But we can't allocate directly in the old generation, 409 // so we allocate wherever, and hope that the first collection 410 // moves these objects to the bottom of the old generation. 411 int size = FullGCALotDummies * 2; 412 413 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 414 objArrayHandle dummy_array(THREAD, naked_array); 415 int i = 0; 416 while (i < size) { 417 // Allocate dummy in old generation 418 oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK); 419 dummy_array->obj_at_put(i++, dummy); 420 } 421 { 422 // Only modify the global variable inside the mutex. 423 // If we had a race to here, the other dummy_array instances 424 // and their elements just get dropped on the floor, which is fine. 425 MutexLocker ml(THREAD, FullGCALot_lock); 426 if (_fullgc_alot_dummy_array.is_empty()) { 427 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array()); 428 } 429 } 430 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking"); 431 } 432 #endif 433 } 434 435 void Universe::initialize_basic_type_mirrors(TRAPS) { 436 #if INCLUDE_CDS_JAVA_HEAP 437 if (UseSharedSpaces && 438 HeapShared::open_archive_heap_region_mapped() && 439 _mirrors[T_INT].resolve() != NULL) { 440 assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity"); 441 442 // check that all mirrors are mapped also 443 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 444 if (!is_reference_type((BasicType)i)) { 445 oop m = _mirrors[i].resolve(); 446 assert(m != NULL, "archived mirrors should not be NULL"); 447 } 448 } 449 } else 450 // _mirror[T_INT} could be NULL if archived heap is not mapped. 451 #endif 452 { 453 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 454 BasicType bt = (BasicType)i; 455 if (!is_reference_type(bt)) { 456 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK); 457 _mirrors[i] = OopHandle(vm_global(), m); 458 } 459 } 460 } 461 } 462 463 void Universe::fixup_mirrors(TRAPS) { 464 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 465 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 466 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 467 // that the number of objects allocated at this point is very small. 468 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 469 HandleMark hm(THREAD); 470 471 if (!UseSharedSpaces) { 472 // Cache the start of the static fields 473 InstanceMirrorKlass::init_offset_of_static_fields(); 474 } 475 476 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 477 int list_length = list->length(); 478 for (int i = 0; i < list_length; i++) { 479 Klass* k = list->at(i); 480 assert(k->is_klass(), "List should only hold classes"); 481 EXCEPTION_MARK; 482 java_lang_Class::fixup_mirror(k, CATCH); 483 } 484 delete java_lang_Class::fixup_mirror_list(); 485 java_lang_Class::set_fixup_mirror_list(NULL); 486 } 487 488 #define assert_pll_locked(test) \ 489 assert(Heap_lock->test(), "Reference pending list access requires lock") 490 491 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 492 493 oop Universe::reference_pending_list() { 494 if (Thread::current()->is_VM_thread()) { 495 assert_pll_locked(is_locked); 496 } else { 497 assert_pll_ownership(); 498 } 499 return _reference_pending_list.resolve(); 500 } 501 502 void Universe::clear_reference_pending_list() { 503 assert_pll_ownership(); 504 _reference_pending_list.replace(NULL); 505 } 506 507 bool Universe::has_reference_pending_list() { 508 assert_pll_ownership(); 509 return _reference_pending_list.peek() != NULL; 510 } 511 512 oop Universe::swap_reference_pending_list(oop list) { 513 assert_pll_locked(is_locked); 514 return _reference_pending_list.xchg(list); 515 } 516 517 #undef assert_pll_locked 518 #undef assert_pll_ownership 519 520 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) { 521 // init vtable of k and all subclasses 522 ko->vtable().initialize_vtable(false, CHECK); 523 if (ko->is_instance_klass()) { 524 for (Klass* sk = ko->subklass(); 525 sk != NULL; 526 sk = sk->next_sibling()) { 527 reinitialize_vtable_of(sk, CHECK); 528 } 529 } 530 } 531 532 void Universe::reinitialize_vtables(TRAPS) { 533 // The vtables are initialized by starting at java.lang.Object and 534 // initializing through the subclass links, so that the super 535 // classes are always initialized first. 536 Klass* ok = SystemDictionary::Object_klass(); 537 Universe::reinitialize_vtable_of(ok, THREAD); 538 } 539 540 541 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) { 542 k->itable().initialize_itable(false, CHECK); 543 } 544 545 546 void Universe::reinitialize_itables(TRAPS) { 547 MutexLocker mcld(THREAD, ClassLoaderDataGraph_lock); 548 ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK); 549 } 550 551 552 bool Universe::on_page_boundary(void* addr) { 553 return is_aligned(addr, os::vm_page_size()); 554 } 555 556 // the array of preallocated errors with backtraces 557 objArrayOop Universe::preallocated_out_of_memory_errors() { 558 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve(); 559 } 560 561 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); } 562 563 oop Universe::out_of_memory_error_java_heap() { 564 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap)); 565 } 566 567 oop Universe::out_of_memory_error_c_heap() { 568 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap)); 569 } 570 571 oop Universe::out_of_memory_error_metaspace() { 572 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace)); 573 } 574 575 oop Universe::out_of_memory_error_class_metaspace() { 576 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace)); 577 } 578 579 oop Universe::out_of_memory_error_array_size() { 580 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size)); 581 } 582 583 oop Universe::out_of_memory_error_gc_overhead_limit() { 584 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit)); 585 } 586 587 oop Universe::out_of_memory_error_realloc_objects() { 588 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects)); 589 } 590 591 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM 592 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); } 593 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); } 594 595 596 bool Universe::should_fill_in_stack_trace(Handle throwable) { 597 // never attempt to fill in the stack trace of preallocated errors that do not have 598 // backtrace. These errors are kept alive forever and may be "re-used" when all 599 // preallocated errors with backtrace have been consumed. Also need to avoid 600 // a potential loop which could happen if an out of memory occurs when attempting 601 // to allocate the backtrace. 602 objArrayOop preallocated_oom = out_of_memory_errors(); 603 for (int i = 0; i < _oom_count; i++) { 604 if (throwable() == preallocated_oom->obj_at(i)) { 605 return false; 606 } 607 } 608 return true; 609 } 610 611 612 oop Universe::gen_out_of_memory_error(oop default_err) { 613 // generate an out of memory error: 614 // - if there is a preallocated error and stack traces are available 615 // (j.l.Throwable is initialized), then return the preallocated 616 // error with a filled in stack trace, and with the message 617 // provided by the default error. 618 // - otherwise, return the default error, without a stack trace. 619 int next; 620 if ((_preallocated_out_of_memory_error_avail_count > 0) && 621 SystemDictionary::Throwable_klass()->is_initialized()) { 622 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1); 623 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 624 } else { 625 next = -1; 626 } 627 if (next < 0) { 628 // all preallocated errors have been used. 629 // return default 630 return default_err; 631 } else { 632 Thread* THREAD = Thread::current(); 633 Handle default_err_h(THREAD, default_err); 634 // get the error object at the slot and set set it to NULL so that the 635 // array isn't keeping it alive anymore. 636 Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next)); 637 assert(exc() != NULL, "slot has been used already"); 638 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 639 640 // use the message from the default error 641 oop msg = java_lang_Throwable::message(default_err_h()); 642 assert(msg != NULL, "no message"); 643 java_lang_Throwable::set_message(exc(), msg); 644 645 // populate the stack trace and return it. 646 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 647 return exc(); 648 } 649 } 650 651 // Setup preallocated OutOfMemoryError errors 652 void Universe::create_preallocated_out_of_memory_errors(TRAPS) { 653 InstanceKlass* ik = SystemDictionary::OutOfMemoryError_klass(); 654 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK); 655 objArrayHandle oom_array(THREAD, oa); 656 657 for (int i = 0; i < _oom_count; i++) { 658 oop oom_obj = ik->allocate_instance(CHECK); 659 oom_array->obj_at_put(i, oom_obj); 660 } 661 _out_of_memory_errors = OopHandle(vm_global(), oom_array()); 662 663 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK); 664 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg()); 665 666 msg = java_lang_String::create_from_str("C heap space", CHECK); 667 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg()); 668 669 msg = java_lang_String::create_from_str("Metaspace", CHECK); 670 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg()); 671 672 msg = java_lang_String::create_from_str("Compressed class space", CHECK); 673 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg()); 674 675 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK); 676 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg()); 677 678 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK); 679 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg()); 680 681 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK); 682 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg()); 683 684 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK); 685 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg()); 686 687 // Setup the array of errors that have preallocated backtrace 688 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 689 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK); 690 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance); 691 objArrayHandle preallocated_oom_array(THREAD, instance); 692 693 for (int i=0; i<len; i++) { 694 oop err = ik->allocate_instance(CHECK); 695 Handle err_h(THREAD, err); 696 java_lang_Throwable::allocate_backtrace(err_h, CHECK); 697 preallocated_oom_array->obj_at_put(i, err_h()); 698 } 699 _preallocated_out_of_memory_error_avail_count = (jint)len; 700 } 701 702 intptr_t Universe::_non_oop_bits = 0; 703 704 void* Universe::non_oop_word() { 705 // Neither the high bits nor the low bits of this value is allowed 706 // to look like (respectively) the high or low bits of a real oop. 707 // 708 // High and low are CPU-specific notions, but low always includes 709 // the low-order bit. Since oops are always aligned at least mod 4, 710 // setting the low-order bit will ensure that the low half of the 711 // word will never look like that of a real oop. 712 // 713 // Using the OS-supplied non-memory-address word (usually 0 or -1) 714 // will take care of the high bits, however many there are. 715 716 if (_non_oop_bits == 0) { 717 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 718 } 719 720 return (void*)_non_oop_bits; 721 } 722 723 static void initialize_global_behaviours() { 724 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour()); 725 } 726 727 jint universe_init() { 728 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 729 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 730 "LogHeapWordSize is incorrect."); 731 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 732 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 733 "oop size is not not a multiple of HeapWord size"); 734 735 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 736 737 initialize_global_behaviours(); 738 739 GCLogPrecious::initialize(); 740 741 GCConfig::arguments()->initialize_heap_sizes(); 742 743 jint status = Universe::initialize_heap(); 744 if (status != JNI_OK) { 745 return status; 746 } 747 748 Universe::initialize_tlab(); 749 750 Metaspace::global_initialize(); 751 752 // Initialize performance counters for metaspaces 753 MetaspaceCounters::initialize_performance_counters(); 754 CompressedClassSpaceCounters::initialize_performance_counters(); 755 756 AOTLoader::universe_init(); 757 758 // Checks 'AfterMemoryInit' constraints. 759 if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) { 760 return JNI_EINVAL; 761 } 762 763 // Create memory for metadata. Must be after initializing heap for 764 // DumpSharedSpaces. 765 ClassLoaderData::init_null_class_loader_data(); 766 767 // We have a heap so create the Method* caches before 768 // Metaspace::initialize_shared_spaces() tries to populate them. 769 Universe::_finalizer_register_cache = new LatestMethodCache(); 770 Universe::_loader_addClass_cache = new LatestMethodCache(); 771 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 772 Universe::_throw_no_such_method_error_cache = new LatestMethodCache(); 773 Universe::_do_stack_walk_cache = new LatestMethodCache(); 774 775 #if INCLUDE_CDS 776 if (UseSharedSpaces) { 777 // Read the data structures supporting the shared spaces (shared 778 // system dictionary, symbol table, etc.). After that, access to 779 // the file (other than the mapped regions) is no longer needed, and 780 // the file is closed. Closing the file does not affect the 781 // currently mapped regions. 782 MetaspaceShared::initialize_shared_spaces(); 783 StringTable::create_table(); 784 } else 785 #endif 786 { 787 SymbolTable::create_table(); 788 StringTable::create_table(); 789 } 790 791 #if INCLUDE_CDS 792 if (Arguments::is_dumping_archive()) { 793 MetaspaceShared::prepare_for_dumping(); 794 } 795 #endif 796 797 if (strlen(VerifySubSet) > 0) { 798 Universe::initialize_verify_flags(); 799 } 800 801 ResolvedMethodTable::create_table(); 802 803 return JNI_OK; 804 } 805 806 jint Universe::initialize_heap() { 807 assert(_collectedHeap == NULL, "Heap already created"); 808 _collectedHeap = GCConfig::arguments()->create_heap(); 809 810 log_info(gc)("Using %s", _collectedHeap->name()); 811 return _collectedHeap->initialize(); 812 } 813 814 void Universe::initialize_tlab() { 815 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 816 if (UseTLAB) { 817 assert(Universe::heap()->supports_tlab_allocation(), 818 "Should support thread-local allocation buffers"); 819 ThreadLocalAllocBuffer::startup_initialization(); 820 } 821 } 822 823 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 824 825 assert(alignment <= Arguments::conservative_max_heap_alignment(), 826 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 827 alignment, Arguments::conservative_max_heap_alignment()); 828 829 size_t total_reserved = align_up(heap_size, alignment); 830 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 831 "heap size is too big for compressed oops"); 832 833 bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size()); 834 assert(!UseLargePages 835 || UseParallelGC 836 || use_large_pages, "Wrong alignment to use large pages"); 837 838 // Now create the space. 839 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt); 840 841 if (total_rs.is_reserved()) { 842 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 843 "must be exactly of required size and alignment"); 844 // We are good. 845 846 if (AllocateHeapAt != NULL) { 847 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 848 } 849 850 if (UseCompressedOops) { 851 CompressedOops::initialize(total_rs); 852 } 853 854 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end()); 855 856 return total_rs; 857 } 858 859 vm_exit_during_initialization( 860 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 861 total_reserved/K)); 862 863 // satisfy compiler 864 ShouldNotReachHere(); 865 return ReservedHeapSpace(0, 0, false); 866 } 867 868 869 // It's the caller's responsibility to ensure glitch-freedom 870 // (if required). 871 void Universe::update_heap_info_at_gc() { 872 _heap_capacity_at_last_gc = heap()->capacity(); 873 _heap_used_at_last_gc = heap()->used(); 874 } 875 876 OopStorage* Universe::vm_weak() { 877 return Universe::_vm_weak; 878 } 879 880 OopStorage* Universe::vm_global() { 881 return Universe::_vm_global; 882 } 883 884 void Universe::oopstorage_init() { 885 Universe::_vm_global = OopStorageSet::create_strong("VM Global"); 886 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak"); 887 } 888 889 void universe_oopstorage_init() { 890 Universe::oopstorage_init(); 891 } 892 893 void initialize_known_method(LatestMethodCache* method_cache, 894 InstanceKlass* ik, 895 const char* method, 896 Symbol* signature, 897 bool is_static, TRAPS) 898 { 899 TempNewSymbol name = SymbolTable::new_symbol(method); 900 Method* m = NULL; 901 // The klass must be linked before looking up the method. 902 if (!ik->link_class_or_fail(THREAD) || 903 ((m = ik->find_method(name, signature)) == NULL) || 904 is_static != m->is_static()) { 905 ResourceMark rm(THREAD); 906 // NoSuchMethodException doesn't actually work because it tries to run the 907 // <init> function before java_lang_Class is linked. Print error and exit. 908 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 909 ik->name()->as_C_string(), method)); 910 } 911 method_cache->init(ik, m); 912 } 913 914 void Universe::initialize_known_methods(TRAPS) { 915 // Set up static method for registering finalizers 916 initialize_known_method(_finalizer_register_cache, 917 SystemDictionary::Finalizer_klass(), 918 "register", 919 vmSymbols::object_void_signature(), true, CHECK); 920 921 initialize_known_method(_throw_illegal_access_error_cache, 922 SystemDictionary::internal_Unsafe_klass(), 923 "throwIllegalAccessError", 924 vmSymbols::void_method_signature(), true, CHECK); 925 926 initialize_known_method(_throw_no_such_method_error_cache, 927 SystemDictionary::internal_Unsafe_klass(), 928 "throwNoSuchMethodError", 929 vmSymbols::void_method_signature(), true, CHECK); 930 931 // Set up method for registering loaded classes in class loader vector 932 initialize_known_method(_loader_addClass_cache, 933 SystemDictionary::ClassLoader_klass(), 934 "addClass", 935 vmSymbols::class_void_signature(), false, CHECK); 936 937 // Set up method for stack walking 938 initialize_known_method(_do_stack_walk_cache, 939 SystemDictionary::AbstractStackWalker_klass(), 940 "doStackWalk", 941 vmSymbols::doStackWalk_signature(), false, CHECK); 942 } 943 944 void universe2_init() { 945 EXCEPTION_MARK; 946 Universe::genesis(CATCH); 947 } 948 949 // Set after initialization of the module runtime, call_initModuleRuntime 950 void universe_post_module_init() { 951 Universe::_module_initialized = true; 952 } 953 954 bool universe_post_init() { 955 assert(!is_init_completed(), "Error: initialization not yet completed!"); 956 Universe::_fully_initialized = true; 957 EXCEPTION_MARK; 958 if (!UseSharedSpaces) { 959 ResourceMark rm; 960 Universe::reinitialize_vtables(CHECK_false); 961 Universe::reinitialize_itables(CHECK_false); 962 } 963 964 HandleMark hm(THREAD); 965 // Setup preallocated empty java.lang.Class array for Method reflection. 966 967 objArrayOop the_empty_class_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 968 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array); 969 970 // Setup preallocated OutOfMemoryError errors 971 Universe::create_preallocated_out_of_memory_errors(CHECK_false); 972 973 oop instance; 974 // Setup preallocated cause message for delayed StackOverflowError 975 if (StackReservedPages > 0) { 976 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 977 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance); 978 } 979 980 // Setup preallocated NullPointerException 981 // (this is currently used for a cheap & dirty solution in compiler exception handling) 982 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 983 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 984 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance); 985 986 // Setup preallocated ArithmeticException 987 // (this is currently used for a cheap & dirty solution in compiler exception handling) 988 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 989 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 990 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance); 991 992 // Virtual Machine Error for when we get into a situation we can't resolve 993 k = SystemDictionary::VirtualMachineError_klass(); 994 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 995 if (!linked) { 996 tty->print_cr("Unable to link/verify VirtualMachineError class"); 997 return false; // initialization failed 998 } 999 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1000 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance); 1001 1002 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1003 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg()); 1004 1005 Universe::initialize_known_methods(CHECK_false); 1006 1007 // This needs to be done before the first scavenge/gc, since 1008 // it's an input to soft ref clearing policy. 1009 { 1010 MutexLocker x(THREAD, Heap_lock); 1011 Universe::update_heap_info_at_gc(); 1012 } 1013 1014 // ("weak") refs processing infrastructure initialization 1015 Universe::heap()->post_initialize(); 1016 1017 MemoryService::add_metaspace_memory_pools(); 1018 1019 MemoryService::set_universe_heap(Universe::heap()); 1020 #if INCLUDE_CDS 1021 MetaspaceShared::post_initialize(CHECK_false); 1022 #endif 1023 return true; 1024 } 1025 1026 1027 void Universe::compute_base_vtable_size() { 1028 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1029 } 1030 1031 void Universe::print_on(outputStream* st) { 1032 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1033 st->print_cr("Heap"); 1034 heap()->print_on(st); 1035 } 1036 1037 void Universe::print_heap_at_SIGBREAK() { 1038 if (PrintHeapAtSIGBREAK) { 1039 print_on(tty); 1040 tty->cr(); 1041 tty->flush(); 1042 } 1043 } 1044 1045 void Universe::print_heap_before_gc() { 1046 LogTarget(Debug, gc, heap) lt; 1047 if (lt.is_enabled()) { 1048 LogStream ls(lt); 1049 ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1050 ResourceMark rm; 1051 heap()->print_on(&ls); 1052 } 1053 } 1054 1055 void Universe::print_heap_after_gc() { 1056 LogTarget(Debug, gc, heap) lt; 1057 if (lt.is_enabled()) { 1058 LogStream ls(lt); 1059 ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections()); 1060 ResourceMark rm; 1061 heap()->print_on(&ls); 1062 } 1063 } 1064 1065 void Universe::initialize_verify_flags() { 1066 verify_flags = 0; 1067 const char delimiter[] = " ,"; 1068 1069 size_t length = strlen(VerifySubSet); 1070 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1071 strncpy(subset_list, VerifySubSet, length + 1); 1072 char* save_ptr; 1073 1074 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1075 while (token != NULL) { 1076 if (strcmp(token, "threads") == 0) { 1077 verify_flags |= Verify_Threads; 1078 } else if (strcmp(token, "heap") == 0) { 1079 verify_flags |= Verify_Heap; 1080 } else if (strcmp(token, "symbol_table") == 0) { 1081 verify_flags |= Verify_SymbolTable; 1082 } else if (strcmp(token, "string_table") == 0) { 1083 verify_flags |= Verify_StringTable; 1084 } else if (strcmp(token, "codecache") == 0) { 1085 verify_flags |= Verify_CodeCache; 1086 } else if (strcmp(token, "dictionary") == 0) { 1087 verify_flags |= Verify_SystemDictionary; 1088 } else if (strcmp(token, "classloader_data_graph") == 0) { 1089 verify_flags |= Verify_ClassLoaderDataGraph; 1090 } else if (strcmp(token, "metaspace") == 0) { 1091 verify_flags |= Verify_MetaspaceUtils; 1092 } else if (strcmp(token, "jni_handles") == 0) { 1093 verify_flags |= Verify_JNIHandles; 1094 } else if (strcmp(token, "codecache_oops") == 0) { 1095 verify_flags |= Verify_CodeCacheOops; 1096 } else if (strcmp(token, "resolved_method_table") == 0) { 1097 verify_flags |= Verify_ResolvedMethodTable; 1098 } else { 1099 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1100 } 1101 token = strtok_r(NULL, delimiter, &save_ptr); 1102 } 1103 FREE_C_HEAP_ARRAY(char, subset_list); 1104 } 1105 1106 bool Universe::should_verify_subset(uint subset) { 1107 if (verify_flags & subset) { 1108 return true; 1109 } 1110 return false; 1111 } 1112 1113 void Universe::verify(VerifyOption option, const char* prefix) { 1114 // The use of _verify_in_progress is a temporary work around for 1115 // 6320749. Don't bother with a creating a class to set and clear 1116 // it since it is only used in this method and the control flow is 1117 // straight forward. 1118 _verify_in_progress = true; 1119 1120 COMPILER2_PRESENT( 1121 assert(!DerivedPointerTable::is_active(), 1122 "DPT should not be active during verification " 1123 "(of thread stacks below)"); 1124 ) 1125 1126 Thread* thread = Thread::current(); 1127 ResourceMark rm(thread); 1128 HandleMark hm(thread); // Handles created during verification can be zapped 1129 _verify_count++; 1130 1131 FormatBuffer<> title("Verifying %s", prefix); 1132 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1133 if (should_verify_subset(Verify_Threads)) { 1134 log_debug(gc, verify)("Threads"); 1135 Threads::verify(); 1136 } 1137 if (should_verify_subset(Verify_Heap)) { 1138 log_debug(gc, verify)("Heap"); 1139 heap()->verify(option); 1140 } 1141 if (should_verify_subset(Verify_SymbolTable)) { 1142 log_debug(gc, verify)("SymbolTable"); 1143 SymbolTable::verify(); 1144 } 1145 if (should_verify_subset(Verify_StringTable)) { 1146 log_debug(gc, verify)("StringTable"); 1147 StringTable::verify(); 1148 } 1149 if (should_verify_subset(Verify_CodeCache)) { 1150 { 1151 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1152 log_debug(gc, verify)("CodeCache"); 1153 CodeCache::verify(); 1154 } 1155 } 1156 if (should_verify_subset(Verify_SystemDictionary)) { 1157 log_debug(gc, verify)("SystemDictionary"); 1158 SystemDictionary::verify(); 1159 } 1160 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1161 log_debug(gc, verify)("ClassLoaderDataGraph"); 1162 ClassLoaderDataGraph::verify(); 1163 } 1164 if (should_verify_subset(Verify_MetaspaceUtils)) { 1165 log_debug(gc, verify)("MetaspaceUtils"); 1166 MetaspaceUtils::verify_free_chunks(); 1167 } 1168 if (should_verify_subset(Verify_JNIHandles)) { 1169 log_debug(gc, verify)("JNIHandles"); 1170 JNIHandles::verify(); 1171 } 1172 if (should_verify_subset(Verify_CodeCacheOops)) { 1173 log_debug(gc, verify)("CodeCache Oops"); 1174 CodeCache::verify_oops(); 1175 } 1176 if (should_verify_subset(Verify_ResolvedMethodTable)) { 1177 log_debug(gc, verify)("ResolvedMethodTable Oops"); 1178 ResolvedMethodTable::verify(); 1179 } 1180 1181 _verify_in_progress = false; 1182 } 1183 1184 1185 #ifndef PRODUCT 1186 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1187 assert(low_boundary < high_boundary, "bad interval"); 1188 1189 // decide which low-order bits we require to be clear: 1190 size_t alignSize = MinObjAlignmentInBytes; 1191 size_t min_object_size = CollectedHeap::min_fill_size(); 1192 1193 // make an inclusive limit: 1194 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1195 uintptr_t min = (uintptr_t)low_boundary; 1196 assert(min < max, "bad interval"); 1197 uintptr_t diff = max ^ min; 1198 1199 // throw away enough low-order bits to make the diff vanish 1200 uintptr_t mask = (uintptr_t)(-1); 1201 while ((mask & diff) != 0) 1202 mask <<= 1; 1203 uintptr_t bits = (min & mask); 1204 assert(bits == (max & mask), "correct mask"); 1205 // check an intermediate value between min and max, just to make sure: 1206 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1207 1208 // require address alignment, too: 1209 mask |= (alignSize - 1); 1210 1211 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1212 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1213 } 1214 _verify_oop_mask = mask; 1215 _verify_oop_bits = bits; 1216 } 1217 1218 // Oop verification (see MacroAssembler::verify_oop) 1219 1220 uintptr_t Universe::verify_oop_mask() { 1221 return _verify_oop_mask; 1222 } 1223 1224 uintptr_t Universe::verify_oop_bits() { 1225 return _verify_oop_bits; 1226 } 1227 1228 uintptr_t Universe::verify_mark_mask() { 1229 return markWord::lock_mask_in_place; 1230 } 1231 1232 uintptr_t Universe::verify_mark_bits() { 1233 intptr_t mask = verify_mark_mask(); 1234 intptr_t bits = (intptr_t)markWord::prototype().value(); 1235 assert((bits & ~mask) == 0, "no stray header bits"); 1236 return bits; 1237 } 1238 #endif // PRODUCT 1239 1240 1241 void LatestMethodCache::init(Klass* k, Method* m) { 1242 if (!UseSharedSpaces) { 1243 _klass = k; 1244 } 1245 #ifndef PRODUCT 1246 else { 1247 // sharing initilization should have already set up _klass 1248 assert(_klass != NULL, "just checking"); 1249 } 1250 #endif 1251 1252 _method_idnum = m->method_idnum(); 1253 assert(_method_idnum >= 0, "sanity check"); 1254 } 1255 1256 1257 Method* LatestMethodCache::get_method() { 1258 if (klass() == NULL) return NULL; 1259 InstanceKlass* ik = InstanceKlass::cast(klass()); 1260 Method* m = ik->method_with_idnum(method_idnum()); 1261 assert(m != NULL, "sanity check"); 1262 return m; 1263 } 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 return false; 1276 } 1277 1278 // Release dummy at bottom of old generation 1279 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1280 } 1281 return true; 1282 } 1283 1284 #endif // ASSERT