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/dynamicArchive.hpp" 27 #include "cds/heapShared.hpp" 28 #include "cds/metaspaceShared.hpp" 29 #include "classfile/classLoader.hpp" 30 #include "classfile/classLoaderDataGraph.hpp" 31 #include "classfile/javaClasses.hpp" 32 #include "classfile/stringTable.hpp" 33 #include "classfile/symbolTable.hpp" 34 #include "classfile/systemDictionary.hpp" 35 #include "classfile/vmClasses.hpp" 36 #include "classfile/vmSymbols.hpp" 37 #include "code/codeBehaviours.hpp" 38 #include "code/codeCache.hpp" 39 #include "compiler/oopMap.hpp" 40 #include "gc/shared/collectedHeap.inline.hpp" 41 #include "gc/shared/gcArguments.hpp" 42 #include "gc/shared/gcConfig.hpp" 43 #include "gc/shared/gcLogPrecious.hpp" 44 #include "gc/shared/gcTraceTime.inline.hpp" 45 #include "gc/shared/oopStorageSet.hpp" 46 #include "gc/shared/stringdedup/stringDedup.hpp" 47 #include "gc/shared/tlab_globals.hpp" 48 #include "logging/log.hpp" 49 #include "logging/logStream.hpp" 50 #include "memory/metadataFactory.hpp" 51 #include "memory/metaspaceClosure.hpp" 52 #include "memory/metaspaceCounters.hpp" 53 #include "memory/metaspaceUtils.hpp" 54 #include "memory/oopFactory.hpp" 55 #include "memory/resourceArea.hpp" 56 #include "memory/universe.hpp" 57 #include "oops/compressedOops.hpp" 58 #include "oops/instanceKlass.hpp" 59 #include "oops/instanceMirrorKlass.hpp" 60 #include "oops/klass.inline.hpp" 61 #include "oops/objArrayOop.inline.hpp" 62 #include "oops/oop.inline.hpp" 63 #include "oops/oopHandle.inline.hpp" 64 #include "oops/typeArrayKlass.hpp" 65 #include "prims/resolvedMethodTable.hpp" 66 #include "runtime/arguments.hpp" 67 #include "runtime/atomic.hpp" 68 #include "runtime/flags/jvmFlagLimit.hpp" 69 #include "runtime/handles.inline.hpp" 70 #include "runtime/init.hpp" 71 #include "runtime/java.hpp" 72 #include "runtime/jniHandles.hpp" 73 #include "runtime/thread.inline.hpp" 74 #include "runtime/timerTrace.hpp" 75 #include "services/memoryService.hpp" 76 #include "utilities/align.hpp" 77 #include "utilities/autoRestore.hpp" 78 #include "utilities/debug.hpp" 79 #include "utilities/formatBuffer.hpp" 80 #include "utilities/macros.hpp" 81 #include "utilities/ostream.hpp" 82 #include "utilities/preserveException.hpp" 83 84 // Known objects 85 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ }; 86 Klass* Universe::_objectArrayKlassObj = NULL; 87 OopHandle Universe::_mirrors[T_VOID+1]; 88 89 OopHandle Universe::_main_thread_group; 90 OopHandle Universe::_system_thread_group; 91 OopHandle Universe::_the_empty_class_array; 92 OopHandle Universe::_the_null_string; 93 OopHandle Universe::_the_min_jint_string; 94 95 OopHandle Universe::_the_null_sentinel; 96 97 // _out_of_memory_errors is an objArray 98 enum OutOfMemoryInstance { _oom_java_heap, 99 _oom_c_heap, 100 _oom_metaspace, 101 _oom_class_metaspace, 102 _oom_array_size, 103 _oom_gc_overhead_limit, 104 _oom_realloc_objects, 105 _oom_retry, 106 _oom_count }; 107 108 OopHandle Universe::_out_of_memory_errors; 109 OopHandle Universe::_delayed_stack_overflow_error_message; 110 OopHandle Universe::_preallocated_out_of_memory_error_array; 111 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 112 113 // Message details for OOME objects, preallocate these objects since they could be 114 // used when throwing OOME, we should try to avoid further allocation in such case 115 OopHandle Universe::_msg_metaspace; 116 OopHandle Universe::_msg_class_metaspace; 117 118 OopHandle Universe::_null_ptr_exception_instance; 119 OopHandle Universe::_arithmetic_exception_instance; 120 OopHandle Universe::_virtual_machine_error_instance; 121 122 OopHandle Universe::_reference_pending_list; 123 124 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 125 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 126 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 127 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 128 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL; 129 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 130 LatestMethodCache* Universe::_is_substitutable_cache = NULL; 131 LatestMethodCache* Universe::_primitive_type_hash_code_cache = NULL; 132 133 long Universe::verify_flags = Universe::Verify_All; 134 135 Array<int>* Universe::_the_empty_int_array = NULL; 136 Array<u2>* Universe::_the_empty_short_array = NULL; 137 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 138 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL; 139 Array<Method*>* Universe::_the_empty_method_array = NULL; 140 141 // These variables are guarded by FullGCALot_lock. 142 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;) 143 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 144 145 // Heap 146 int Universe::_verify_count = 0; 147 148 // Oop verification (see MacroAssembler::verify_oop) 149 uintptr_t Universe::_verify_oop_mask = 0; 150 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 151 152 int Universe::_base_vtable_size = 0; 153 bool Universe::_bootstrapping = false; 154 bool Universe::_module_initialized = false; 155 bool Universe::_fully_initialized = false; 156 157 OopStorage* Universe::_vm_weak = NULL; 158 OopStorage* Universe::_vm_global = NULL; 159 160 CollectedHeap* Universe::_collectedHeap = NULL; 161 162 objArrayOop Universe::the_empty_class_array () { 163 return (objArrayOop)_the_empty_class_array.resolve(); 164 } 165 166 oop Universe::main_thread_group() { return _main_thread_group.resolve(); } 167 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); } 168 169 oop Universe::system_thread_group() { return _system_thread_group.resolve(); } 170 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); } 171 172 oop Universe::the_null_string() { return _the_null_string.resolve(); } 173 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); } 174 175 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); } 176 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); } 177 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); } 178 179 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); } 180 181 oop Universe::int_mirror() { return check_mirror(_mirrors[T_INT].resolve()); } 182 oop Universe::float_mirror() { return check_mirror(_mirrors[T_FLOAT].resolve()); } 183 oop Universe::double_mirror() { return check_mirror(_mirrors[T_DOUBLE].resolve()); } 184 oop Universe::byte_mirror() { return check_mirror(_mirrors[T_BYTE].resolve()); } 185 oop Universe::bool_mirror() { return check_mirror(_mirrors[T_BOOLEAN].resolve()); } 186 oop Universe::char_mirror() { return check_mirror(_mirrors[T_CHAR].resolve()); } 187 oop Universe::long_mirror() { return check_mirror(_mirrors[T_LONG].resolve()); } 188 oop Universe::short_mirror() { return check_mirror(_mirrors[T_SHORT].resolve()); } 189 oop Universe::void_mirror() { return check_mirror(_mirrors[T_VOID].resolve()); } 190 191 oop Universe::java_mirror(BasicType t) { 192 assert((uint)t < T_VOID+1, "range check"); 193 return check_mirror(_mirrors[t].resolve()); 194 } 195 196 // Used by CDS dumping 197 void Universe::replace_mirror(BasicType t, oop new_mirror) { 198 Universe::_mirrors[t].replace(new_mirror); 199 } 200 201 void Universe::basic_type_classes_do(KlassClosure *closure) { 202 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 203 closure->do_klass(_typeArrayKlassObjs[i]); 204 } 205 } 206 207 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) { 208 it->push(&_klass); 209 } 210 211 void Universe::metaspace_pointers_do(MetaspaceClosure* it) { 212 for (int i = 0; i < T_LONG+1; i++) { 213 it->push(&_typeArrayKlassObjs[i]); 214 } 215 it->push(&_objectArrayKlassObj); 216 217 it->push(&_the_empty_int_array); 218 it->push(&_the_empty_short_array); 219 it->push(&_the_empty_klass_array); 220 it->push(&_the_empty_instance_klass_array); 221 it->push(&_the_empty_method_array); 222 it->push(&_the_array_interfaces_array); 223 224 _finalizer_register_cache->metaspace_pointers_do(it); 225 _loader_addClass_cache->metaspace_pointers_do(it); 226 _throw_illegal_access_error_cache->metaspace_pointers_do(it); 227 _throw_no_such_method_error_cache->metaspace_pointers_do(it); 228 _do_stack_walk_cache->metaspace_pointers_do(it); 229 _is_substitutable_cache->metaspace_pointers_do(it); 230 _primitive_type_hash_code_cache->metaspace_pointers_do(it); 231 } 232 233 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive 234 void Universe::serialize(SerializeClosure* f) { 235 236 #if INCLUDE_CDS_JAVA_HEAP 237 { 238 oop mirror_oop; 239 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 240 if (f->reading()) { 241 f->do_oop(&mirror_oop); // read from archive 242 assert(oopDesc::is_oop_or_null(mirror_oop), "is oop"); 243 // Only create an OopHandle for non-null mirrors 244 if (mirror_oop != NULL) { 245 _mirrors[i] = OopHandle(vm_global(), mirror_oop); 246 } 247 } else { 248 if (HeapShared::can_write()) { 249 mirror_oop = _mirrors[i].resolve(); 250 } else { 251 mirror_oop = NULL; 252 } 253 f->do_oop(&mirror_oop); // write to archive 254 } 255 if (mirror_oop != NULL) { // may be null if archived heap is disabled 256 java_lang_Class::update_archived_primitive_mirror_native_pointers(mirror_oop); 257 } 258 } 259 } 260 #endif 261 262 for (int i = 0; i < T_LONG+1; i++) { 263 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 264 } 265 266 f->do_ptr((void**)&_objectArrayKlassObj); 267 f->do_ptr((void**)&_the_array_interfaces_array); 268 f->do_ptr((void**)&_the_empty_int_array); 269 f->do_ptr((void**)&_the_empty_short_array); 270 f->do_ptr((void**)&_the_empty_method_array); 271 f->do_ptr((void**)&_the_empty_klass_array); 272 f->do_ptr((void**)&_the_empty_instance_klass_array); 273 _finalizer_register_cache->serialize(f); 274 _loader_addClass_cache->serialize(f); 275 _throw_illegal_access_error_cache->serialize(f); 276 _throw_no_such_method_error_cache->serialize(f); 277 _do_stack_walk_cache->serialize(f); 278 _is_substitutable_cache->serialize(f); 279 _primitive_type_hash_code_cache->serialize(f); 280 } 281 282 283 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 284 if (size < alignment || size % alignment != 0) { 285 vm_exit_during_initialization( 286 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 287 } 288 } 289 290 void initialize_basic_type_klass(Klass* k, TRAPS) { 291 Klass* ok = vmClasses::Object_klass(); 292 #if INCLUDE_CDS 293 if (UseSharedSpaces) { 294 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 295 assert(k->super() == ok, "u3"); 296 if (k->is_instance_klass()) { 297 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK); 298 } else { 299 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK); 300 } 301 } else 302 #endif 303 { 304 k->initialize_supers(ok, NULL, CHECK); 305 } 306 k->append_to_sibling_list(); 307 } 308 309 void Universe::genesis(TRAPS) { 310 ResourceMark rm(THREAD); 311 HandleMark hm(THREAD); 312 313 { AutoModifyRestore<bool> temporarily(_bootstrapping, true); 314 315 { MutexLocker mc(THREAD, Compile_lock); 316 317 java_lang_Class::allocate_fixup_lists(); 318 319 // determine base vtable size; without that we cannot create the array klasses 320 compute_base_vtable_size(); 321 322 if (!UseSharedSpaces) { 323 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 324 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 325 } 326 327 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 328 329 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 330 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 331 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 332 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 333 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 334 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 335 } 336 } 337 338 vmSymbols::initialize(); 339 340 SystemDictionary::initialize(CHECK); 341 342 // Create string constants 343 oop s = StringTable::intern("null", CHECK); 344 _the_null_string = OopHandle(vm_global(), s); 345 s = StringTable::intern("-2147483648", CHECK); 346 _the_min_jint_string = OopHandle(vm_global(), s); 347 348 349 #if INCLUDE_CDS 350 if (UseSharedSpaces) { 351 // Verify shared interfaces array. 352 assert(_the_array_interfaces_array->at(0) == 353 vmClasses::Cloneable_klass(), "u3"); 354 assert(_the_array_interfaces_array->at(1) == 355 vmClasses::Serializable_klass(), "u3"); 356 357 } else 358 #endif 359 { 360 // Set up shared interfaces array. (Do this before supers are set up.) 361 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass()); 362 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass()); 363 } 364 365 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 366 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 367 initialize_basic_type_klass(floatArrayKlassObj(), CHECK); 368 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 369 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 370 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 371 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 372 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 373 } // end of core bootstrapping 374 375 { 376 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 377 _the_null_sentinel = OopHandle(vm_global(), tns()); 378 } 379 380 // Create a handle for reference_pending_list 381 _reference_pending_list = OopHandle(vm_global(), NULL); 382 383 // Maybe this could be lifted up now that object array can be initialized 384 // during the bootstrapping. 385 386 // OLD 387 // Initialize _objectArrayKlass after core bootstraping to make 388 // sure the super class is set up properly for _objectArrayKlass. 389 // --- 390 // NEW 391 // Since some of the old system object arrays have been converted to 392 // ordinary object arrays, _objectArrayKlass will be loaded when 393 // SystemDictionary::initialize(CHECK); is run. See the extra check 394 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 395 _objectArrayKlassObj = InstanceKlass:: 396 cast(vmClasses::Object_klass())->array_klass(1, CHECK); 397 // OLD 398 // Add the class to the class hierarchy manually to make sure that 399 // its vtable is initialized after core bootstrapping is completed. 400 // --- 401 // New 402 // Have already been initialized. 403 _objectArrayKlassObj->append_to_sibling_list(); 404 405 #ifdef ASSERT 406 if (FullGCALot) { 407 // Allocate an array of dummy objects. 408 // We'd like these to be at the bottom of the old generation, 409 // so that when we free one and then collect, 410 // (almost) the whole heap moves 411 // and we find out if we actually update all the oops correctly. 412 // But we can't allocate directly in the old generation, 413 // so we allocate wherever, and hope that the first collection 414 // moves these objects to the bottom of the old generation. 415 int size = FullGCALotDummies * 2; 416 417 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK); 418 objArrayHandle dummy_array(THREAD, naked_array); 419 int i = 0; 420 while (i < size) { 421 // Allocate dummy in old generation 422 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK); 423 dummy_array->obj_at_put(i++, dummy); 424 } 425 { 426 // Only modify the global variable inside the mutex. 427 // If we had a race to here, the other dummy_array instances 428 // and their elements just get dropped on the floor, which is fine. 429 MutexLocker ml(THREAD, FullGCALot_lock); 430 if (_fullgc_alot_dummy_array.is_empty()) { 431 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array()); 432 } 433 } 434 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking"); 435 } 436 #endif 437 } 438 439 void Universe::initialize_basic_type_mirrors(TRAPS) { 440 #if INCLUDE_CDS_JAVA_HEAP 441 if (UseSharedSpaces && 442 HeapShared::are_archived_mirrors_available() && 443 _mirrors[T_INT].resolve() != NULL) { 444 assert(HeapShared::can_use(), "Sanity"); 445 446 // check that all mirrors are mapped also 447 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 448 if (!is_reference_type((BasicType)i)) { 449 oop m = _mirrors[i].resolve(); 450 assert(m != NULL, "archived mirrors should not be NULL"); 451 } 452 } 453 } else 454 // _mirror[T_INT} could be NULL if archived heap is not mapped. 455 #endif 456 { 457 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 458 BasicType bt = (BasicType)i; 459 if (!is_reference_type(bt)) { 460 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK); 461 _mirrors[i] = OopHandle(vm_global(), m); 462 } 463 } 464 } 465 } 466 467 void Universe::fixup_mirrors(TRAPS) { 468 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 469 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 470 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 471 // that the number of objects allocated at this point is very small. 472 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded"); 473 HandleMark hm(THREAD); 474 475 if (!UseSharedSpaces) { 476 // Cache the start of the static fields 477 InstanceMirrorKlass::init_offset_of_static_fields(); 478 } 479 480 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 481 int list_length = list->length(); 482 for (int i = 0; i < list_length; i++) { 483 Klass* k = list->at(i); 484 assert(k->is_klass(), "List should only hold classes"); 485 java_lang_Class::fixup_mirror(k, CATCH); 486 } 487 delete java_lang_Class::fixup_mirror_list(); 488 java_lang_Class::set_fixup_mirror_list(NULL); 489 } 490 491 #define assert_pll_locked(test) \ 492 assert(Heap_lock->test(), "Reference pending list access requires lock") 493 494 #define assert_pll_ownership() assert_pll_locked(owned_by_self) 495 496 oop Universe::reference_pending_list() { 497 if (Thread::current()->is_VM_thread()) { 498 assert_pll_locked(is_locked); 499 } else { 500 assert_pll_ownership(); 501 } 502 return _reference_pending_list.resolve(); 503 } 504 505 void Universe::clear_reference_pending_list() { 506 assert_pll_ownership(); 507 _reference_pending_list.replace(NULL); 508 } 509 510 bool Universe::has_reference_pending_list() { 511 assert_pll_ownership(); 512 return _reference_pending_list.peek() != NULL; 513 } 514 515 oop Universe::swap_reference_pending_list(oop list) { 516 assert_pll_locked(is_locked); 517 return _reference_pending_list.xchg(list); 518 } 519 520 #undef assert_pll_locked 521 #undef assert_pll_ownership 522 523 static void reinitialize_vtables() { 524 // The vtables are initialized by starting at java.lang.Object and 525 // initializing through the subclass links, so that the super 526 // classes are always initialized first. 527 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) { 528 Klass* sub = iter.klass(); 529 sub->vtable().initialize_vtable(); 530 } 531 } 532 533 static void reinitialize_itables() { 534 535 class ReinitTableClosure : public KlassClosure { 536 public: 537 void do_klass(Klass* k) { 538 if (k->is_instance_klass()) { 539 InstanceKlass::cast(k)->itable().initialize_itable(); 540 } 541 } 542 }; 543 544 MutexLocker mcld(ClassLoaderDataGraph_lock); 545 ReinitTableClosure cl; 546 ClassLoaderDataGraph::classes_do(&cl); 547 } 548 549 bool Universe::on_page_boundary(void* addr) { 550 return is_aligned(addr, os::vm_page_size()); 551 } 552 553 // the array of preallocated errors with backtraces 554 objArrayOop Universe::preallocated_out_of_memory_errors() { 555 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve(); 556 } 557 558 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); } 559 560 oop Universe::out_of_memory_error_java_heap() { 561 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap)); 562 } 563 564 oop Universe::out_of_memory_error_c_heap() { 565 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap)); 566 } 567 568 oop Universe::out_of_memory_error_metaspace() { 569 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace)); 570 } 571 572 oop Universe::out_of_memory_error_class_metaspace() { 573 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace)); 574 } 575 576 oop Universe::out_of_memory_error_array_size() { 577 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size)); 578 } 579 580 oop Universe::out_of_memory_error_gc_overhead_limit() { 581 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit)); 582 } 583 584 oop Universe::out_of_memory_error_realloc_objects() { 585 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects)); 586 } 587 588 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM 589 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); } 590 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); } 591 592 593 bool Universe::should_fill_in_stack_trace(Handle throwable) { 594 // never attempt to fill in the stack trace of preallocated errors that do not have 595 // backtrace. These errors are kept alive forever and may be "re-used" when all 596 // preallocated errors with backtrace have been consumed. Also need to avoid 597 // a potential loop which could happen if an out of memory occurs when attempting 598 // to allocate the backtrace. 599 objArrayOop preallocated_oom = out_of_memory_errors(); 600 for (int i = 0; i < _oom_count; i++) { 601 if (throwable() == preallocated_oom->obj_at(i)) { 602 return false; 603 } 604 } 605 return true; 606 } 607 608 609 oop Universe::gen_out_of_memory_error(oop default_err) { 610 // generate an out of memory error: 611 // - if there is a preallocated error and stack traces are available 612 // (j.l.Throwable is initialized), then return the preallocated 613 // error with a filled in stack trace, and with the message 614 // provided by the default error. 615 // - otherwise, return the default error, without a stack trace. 616 int next; 617 if ((_preallocated_out_of_memory_error_avail_count > 0) && 618 vmClasses::Throwable_klass()->is_initialized()) { 619 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1); 620 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 621 } else { 622 next = -1; 623 } 624 if (next < 0) { 625 // all preallocated errors have been used. 626 // return default 627 return default_err; 628 } else { 629 JavaThread* current = JavaThread::current(); 630 Handle default_err_h(current, default_err); 631 // get the error object at the slot and set set it to NULL so that the 632 // array isn't keeping it alive anymore. 633 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next)); 634 assert(exc() != NULL, "slot has been used already"); 635 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 636 637 // use the message from the default error 638 oop msg = java_lang_Throwable::message(default_err_h()); 639 assert(msg != NULL, "no message"); 640 java_lang_Throwable::set_message(exc(), msg); 641 642 // populate the stack trace and return it. 643 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 644 return exc(); 645 } 646 } 647 648 bool Universe::is_out_of_memory_error_metaspace(oop ex_obj) { 649 return java_lang_Throwable::message(ex_obj) == _msg_metaspace.resolve(); 650 } 651 652 bool Universe::is_out_of_memory_error_class_metaspace(oop ex_obj) { 653 return java_lang_Throwable::message(ex_obj) == _msg_class_metaspace.resolve(); 654 } 655 656 // Setup preallocated OutOfMemoryError errors 657 void Universe::create_preallocated_out_of_memory_errors(TRAPS) { 658 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass(); 659 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK); 660 objArrayHandle oom_array(THREAD, oa); 661 662 for (int i = 0; i < _oom_count; i++) { 663 oop oom_obj = ik->allocate_instance(CHECK); 664 oom_array->obj_at_put(i, oom_obj); 665 } 666 _out_of_memory_errors = OopHandle(vm_global(), oom_array()); 667 668 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK); 669 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg()); 670 671 msg = java_lang_String::create_from_str("C heap space", CHECK); 672 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg()); 673 674 msg = java_lang_String::create_from_str("Metaspace", CHECK); 675 _msg_metaspace = OopHandle(vm_global(), msg()); 676 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg()); 677 678 msg = java_lang_String::create_from_str("Compressed class space", CHECK); 679 _msg_class_metaspace = OopHandle(vm_global(), msg()); 680 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg()); 681 682 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK); 683 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg()); 684 685 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK); 686 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg()); 687 688 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK); 689 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg()); 690 691 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK); 692 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg()); 693 694 // Setup the array of errors that have preallocated backtrace 695 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 696 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK); 697 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance); 698 objArrayHandle preallocated_oom_array(THREAD, instance); 699 700 for (int i=0; i<len; i++) { 701 oop err = ik->allocate_instance(CHECK); 702 Handle err_h(THREAD, err); 703 java_lang_Throwable::allocate_backtrace(err_h, CHECK); 704 preallocated_oom_array->obj_at_put(i, err_h()); 705 } 706 _preallocated_out_of_memory_error_avail_count = (jint)len; 707 } 708 709 intptr_t Universe::_non_oop_bits = 0; 710 711 void* Universe::non_oop_word() { 712 // Neither the high bits nor the low bits of this value is allowed 713 // to look like (respectively) the high or low bits of a real oop. 714 // 715 // High and low are CPU-specific notions, but low always includes 716 // the low-order bit. Since oops are always aligned at least mod 4, 717 // setting the low-order bit will ensure that the low half of the 718 // word will never look like that of a real oop. 719 // 720 // Using the OS-supplied non-memory-address word (usually 0 or -1) 721 // will take care of the high bits, however many there are. 722 723 if (_non_oop_bits == 0) { 724 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 725 } 726 727 return (void*)_non_oop_bits; 728 } 729 730 bool Universe::contains_non_oop_word(void* p) { 731 return *(void**)p == non_oop_word(); 732 } 733 734 static void initialize_global_behaviours() { 735 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour()); 736 } 737 738 jint universe_init() { 739 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 740 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 741 "LogHeapWordSize is incorrect."); 742 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 743 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 744 "oop size is not not a multiple of HeapWord size"); 745 746 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 747 748 initialize_global_behaviours(); 749 750 GCLogPrecious::initialize(); 751 752 #ifdef _LP64 753 MetaspaceShared::adjust_heap_sizes_for_dumping(); 754 #endif // _LP64 755 756 GCConfig::arguments()->initialize_heap_sizes(); 757 758 jint status = Universe::initialize_heap(); 759 if (status != JNI_OK) { 760 return status; 761 } 762 763 Universe::initialize_tlab(); 764 765 Metaspace::global_initialize(); 766 // Initialize performance counters for metaspaces 767 MetaspaceCounters::initialize_performance_counters(); 768 769 // Checks 'AfterMemoryInit' constraints. 770 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) { 771 return JNI_EINVAL; 772 } 773 774 // Create memory for metadata. Must be after initializing heap for 775 // DumpSharedSpaces. 776 ClassLoaderData::init_null_class_loader_data(); 777 778 // We have a heap so create the Method* caches before 779 // Metaspace::initialize_shared_spaces() tries to populate them. 780 Universe::_finalizer_register_cache = new LatestMethodCache(); 781 Universe::_loader_addClass_cache = new LatestMethodCache(); 782 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 783 Universe::_throw_no_such_method_error_cache = new LatestMethodCache(); 784 Universe::_do_stack_walk_cache = new LatestMethodCache(); 785 Universe::_is_substitutable_cache = new LatestMethodCache(); 786 Universe::_primitive_type_hash_code_cache = new LatestMethodCache(); 787 788 #if INCLUDE_CDS 789 DynamicArchive::check_for_dynamic_dump(); 790 if (UseSharedSpaces) { 791 // Read the data structures supporting the shared spaces (shared 792 // system dictionary, symbol table, etc.). After that, access to 793 // the file (other than the mapped regions) is no longer needed, and 794 // the file is closed. Closing the file does not affect the 795 // currently mapped regions. 796 MetaspaceShared::initialize_shared_spaces(); 797 StringTable::create_table(); 798 if (HeapShared::is_loaded()) { 799 StringTable::transfer_shared_strings_to_local_table(); 800 } 801 } else 802 #endif 803 { 804 SymbolTable::create_table(); 805 StringTable::create_table(); 806 } 807 808 #if INCLUDE_CDS 809 if (Arguments::is_dumping_archive()) { 810 MetaspaceShared::prepare_for_dumping(); 811 } 812 #endif 813 814 if (strlen(VerifySubSet) > 0) { 815 Universe::initialize_verify_flags(); 816 } 817 818 ResolvedMethodTable::create_table(); 819 820 return JNI_OK; 821 } 822 823 jint Universe::initialize_heap() { 824 assert(_collectedHeap == NULL, "Heap already created"); 825 _collectedHeap = GCConfig::arguments()->create_heap(); 826 827 log_info(gc)("Using %s", _collectedHeap->name()); 828 return _collectedHeap->initialize(); 829 } 830 831 void Universe::initialize_tlab() { 832 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 833 if (UseTLAB) { 834 ThreadLocalAllocBuffer::startup_initialization(); 835 } 836 } 837 838 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 839 840 assert(alignment <= Arguments::conservative_max_heap_alignment(), 841 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 842 alignment, Arguments::conservative_max_heap_alignment()); 843 844 size_t total_reserved = align_up(heap_size, alignment); 845 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 846 "heap size is too big for compressed oops"); 847 848 size_t page_size = os::vm_page_size(); 849 if (UseLargePages && is_aligned(alignment, os::large_page_size())) { 850 page_size = os::large_page_size(); 851 } else { 852 // Parallel is the only collector that might opt out of using large pages 853 // for the heap. 854 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages"); 855 } 856 857 // Now create the space. 858 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt); 859 860 if (total_rs.is_reserved()) { 861 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 862 "must be exactly of required size and alignment"); 863 // We are good. 864 865 if (AllocateHeapAt != NULL) { 866 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 867 } 868 869 if (UseCompressedOops) { 870 CompressedOops::initialize(total_rs); 871 } 872 873 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end()); 874 875 return total_rs; 876 } 877 878 vm_exit_during_initialization( 879 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 880 total_reserved/K)); 881 882 // satisfy compiler 883 ShouldNotReachHere(); 884 return ReservedHeapSpace(0, 0, os::vm_page_size()); 885 } 886 887 OopStorage* Universe::vm_weak() { 888 return Universe::_vm_weak; 889 } 890 891 OopStorage* Universe::vm_global() { 892 return Universe::_vm_global; 893 } 894 895 void Universe::oopstorage_init() { 896 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal); 897 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal); 898 } 899 900 void universe_oopstorage_init() { 901 Universe::oopstorage_init(); 902 } 903 904 void initialize_known_method(LatestMethodCache* method_cache, 905 InstanceKlass* ik, 906 const char* method, 907 Symbol* signature, 908 bool is_static, TRAPS) 909 { 910 TempNewSymbol name = SymbolTable::new_symbol(method); 911 Method* m = NULL; 912 // The klass must be linked before looking up the method. 913 if (!ik->link_class_or_fail(THREAD) || 914 ((m = ik->find_method(name, signature)) == NULL) || 915 is_static != m->is_static()) { 916 ResourceMark rm(THREAD); 917 // NoSuchMethodException doesn't actually work because it tries to run the 918 // <init> function before java_lang_Class is linked. Print error and exit. 919 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 920 ik->name()->as_C_string(), method)); 921 } 922 method_cache->init(ik, m); 923 } 924 925 void Universe::initialize_known_methods(TRAPS) { 926 // Set up static method for registering finalizers 927 initialize_known_method(_finalizer_register_cache, 928 vmClasses::Finalizer_klass(), 929 "register", 930 vmSymbols::object_void_signature(), true, CHECK); 931 932 initialize_known_method(_throw_illegal_access_error_cache, 933 vmClasses::internal_Unsafe_klass(), 934 "throwIllegalAccessError", 935 vmSymbols::void_method_signature(), true, CHECK); 936 937 initialize_known_method(_throw_no_such_method_error_cache, 938 vmClasses::internal_Unsafe_klass(), 939 "throwNoSuchMethodError", 940 vmSymbols::void_method_signature(), true, CHECK); 941 942 // Set up method for registering loaded classes in class loader vector 943 initialize_known_method(_loader_addClass_cache, 944 vmClasses::ClassLoader_klass(), 945 "addClass", 946 vmSymbols::class_void_signature(), false, CHECK); 947 948 // Set up method for stack walking 949 initialize_known_method(_do_stack_walk_cache, 950 vmClasses::AbstractStackWalker_klass(), 951 "doStackWalk", 952 vmSymbols::doStackWalk_signature(), false, CHECK); 953 954 // Set up substitutability testing 955 ResourceMark rm; 956 initialize_known_method(_is_substitutable_cache, 957 vmClasses::PrimitiveObjectMethods_klass(), 958 vmSymbols::isSubstitutable_name()->as_C_string(), 959 vmSymbols::object_object_boolean_signature(), true, CHECK); 960 initialize_known_method(_primitive_type_hash_code_cache, 961 vmClasses::PrimitiveObjectMethods_klass(), 962 vmSymbols::primitiveObjectHashCode_name()->as_C_string(), 963 vmSymbols::object_int_signature(), true, CHECK); 964 } 965 966 void universe2_init() { 967 EXCEPTION_MARK; 968 Universe::genesis(CATCH); 969 } 970 971 // Set after initialization of the module runtime, call_initModuleRuntime 972 void universe_post_module_init() { 973 Universe::_module_initialized = true; 974 } 975 976 bool universe_post_init() { 977 assert(!is_init_completed(), "Error: initialization not yet completed!"); 978 Universe::_fully_initialized = true; 979 EXCEPTION_MARK; 980 if (!UseSharedSpaces) { 981 reinitialize_vtables(); 982 reinitialize_itables(); 983 } 984 985 HandleMark hm(THREAD); 986 // Setup preallocated empty java.lang.Class array for Method reflection. 987 988 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false); 989 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array); 990 991 // Setup preallocated OutOfMemoryError errors 992 Universe::create_preallocated_out_of_memory_errors(CHECK_false); 993 994 oop instance; 995 // Setup preallocated cause message for delayed StackOverflowError 996 if (StackReservedPages > 0) { 997 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 998 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance); 999 } 1000 1001 // Setup preallocated NullPointerException 1002 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1003 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1004 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1005 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance); 1006 1007 // Setup preallocated ArithmeticException 1008 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1009 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1010 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1011 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance); 1012 1013 // Virtual Machine Error for when we get into a situation we can't resolve 1014 k = vmClasses::VirtualMachineError_klass(); 1015 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1016 if (!linked) { 1017 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1018 return false; // initialization failed 1019 } 1020 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1021 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance); 1022 1023 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1024 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg()); 1025 1026 Universe::initialize_known_methods(CHECK_false); 1027 1028 // This needs to be done before the first scavenge/gc, since 1029 // it's an input to soft ref clearing policy. 1030 { 1031 MutexLocker x(THREAD, Heap_lock); 1032 Universe::heap()->update_capacity_and_used_at_gc(); 1033 } 1034 1035 // ("weak") refs processing infrastructure initialization 1036 Universe::heap()->post_initialize(); 1037 1038 MemoryService::add_metaspace_memory_pools(); 1039 1040 MemoryService::set_universe_heap(Universe::heap()); 1041 #if INCLUDE_CDS 1042 MetaspaceShared::post_initialize(CHECK_false); 1043 #endif 1044 return true; 1045 } 1046 1047 1048 void Universe::compute_base_vtable_size() { 1049 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1050 } 1051 1052 void Universe::print_on(outputStream* st) { 1053 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1054 st->print_cr("Heap"); 1055 heap()->print_on(st); 1056 } 1057 1058 void Universe::print_heap_at_SIGBREAK() { 1059 if (PrintHeapAtSIGBREAK) { 1060 print_on(tty); 1061 tty->cr(); 1062 tty->flush(); 1063 } 1064 } 1065 1066 void Universe::initialize_verify_flags() { 1067 verify_flags = 0; 1068 const char delimiter[] = " ,"; 1069 1070 size_t length = strlen(VerifySubSet); 1071 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1072 strncpy(subset_list, VerifySubSet, length + 1); 1073 char* save_ptr; 1074 1075 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1076 while (token != NULL) { 1077 if (strcmp(token, "threads") == 0) { 1078 verify_flags |= Verify_Threads; 1079 } else if (strcmp(token, "heap") == 0) { 1080 verify_flags |= Verify_Heap; 1081 } else if (strcmp(token, "symbol_table") == 0) { 1082 verify_flags |= Verify_SymbolTable; 1083 } else if (strcmp(token, "string_table") == 0) { 1084 verify_flags |= Verify_StringTable; 1085 } else if (strcmp(token, "codecache") == 0) { 1086 verify_flags |= Verify_CodeCache; 1087 } else if (strcmp(token, "dictionary") == 0) { 1088 verify_flags |= Verify_SystemDictionary; 1089 } else if (strcmp(token, "classloader_data_graph") == 0) { 1090 verify_flags |= Verify_ClassLoaderDataGraph; 1091 } else if (strcmp(token, "metaspace") == 0) { 1092 verify_flags |= Verify_MetaspaceUtils; 1093 } else if (strcmp(token, "jni_handles") == 0) { 1094 verify_flags |= Verify_JNIHandles; 1095 } else if (strcmp(token, "codecache_oops") == 0) { 1096 verify_flags |= Verify_CodeCacheOops; 1097 } else if (strcmp(token, "resolved_method_table") == 0) { 1098 verify_flags |= Verify_ResolvedMethodTable; 1099 } else if (strcmp(token, "stringdedup") == 0) { 1100 verify_flags |= Verify_StringDedup; 1101 } else { 1102 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1103 } 1104 token = strtok_r(NULL, delimiter, &save_ptr); 1105 } 1106 FREE_C_HEAP_ARRAY(char, subset_list); 1107 } 1108 1109 bool Universe::should_verify_subset(uint subset) { 1110 if (verify_flags & subset) { 1111 return true; 1112 } 1113 return false; 1114 } 1115 1116 void Universe::verify(VerifyOption option, const char* prefix) { 1117 COMPILER2_PRESENT( 1118 assert(!DerivedPointerTable::is_active(), 1119 "DPT should not be active during verification " 1120 "(of thread stacks below)"); 1121 ) 1122 1123 Thread* thread = Thread::current(); 1124 ResourceMark rm(thread); 1125 HandleMark hm(thread); // Handles created during verification can be zapped 1126 _verify_count++; 1127 1128 FormatBuffer<> title("Verifying %s", prefix); 1129 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1130 if (should_verify_subset(Verify_Threads)) { 1131 log_debug(gc, verify)("Threads"); 1132 Threads::verify(); 1133 } 1134 if (should_verify_subset(Verify_Heap)) { 1135 log_debug(gc, verify)("Heap"); 1136 heap()->verify(option); 1137 } 1138 if (should_verify_subset(Verify_SymbolTable)) { 1139 log_debug(gc, verify)("SymbolTable"); 1140 SymbolTable::verify(); 1141 } 1142 if (should_verify_subset(Verify_StringTable)) { 1143 log_debug(gc, verify)("StringTable"); 1144 StringTable::verify(); 1145 } 1146 if (should_verify_subset(Verify_CodeCache)) { 1147 log_debug(gc, verify)("CodeCache"); 1148 CodeCache::verify(); 1149 } 1150 if (should_verify_subset(Verify_SystemDictionary)) { 1151 log_debug(gc, verify)("SystemDictionary"); 1152 SystemDictionary::verify(); 1153 } 1154 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1155 log_debug(gc, verify)("ClassLoaderDataGraph"); 1156 ClassLoaderDataGraph::verify(); 1157 } 1158 if (should_verify_subset(Verify_MetaspaceUtils)) { 1159 log_debug(gc, verify)("MetaspaceUtils"); 1160 DEBUG_ONLY(MetaspaceUtils::verify();) 1161 } 1162 if (should_verify_subset(Verify_JNIHandles)) { 1163 log_debug(gc, verify)("JNIHandles"); 1164 JNIHandles::verify(); 1165 } 1166 if (should_verify_subset(Verify_CodeCacheOops)) { 1167 log_debug(gc, verify)("CodeCache Oops"); 1168 CodeCache::verify_oops(); 1169 } 1170 if (should_verify_subset(Verify_ResolvedMethodTable)) { 1171 log_debug(gc, verify)("ResolvedMethodTable Oops"); 1172 ResolvedMethodTable::verify(); 1173 } 1174 if (should_verify_subset(Verify_StringDedup)) { 1175 log_debug(gc, verify)("String Deduplication"); 1176 StringDedup::verify(); 1177 } 1178 } 1179 1180 1181 #ifndef PRODUCT 1182 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1183 assert(low_boundary < high_boundary, "bad interval"); 1184 1185 // decide which low-order bits we require to be clear: 1186 size_t alignSize = MinObjAlignmentInBytes; 1187 size_t min_object_size = CollectedHeap::min_fill_size(); 1188 1189 // make an inclusive limit: 1190 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1191 uintptr_t min = (uintptr_t)low_boundary; 1192 assert(min < max, "bad interval"); 1193 uintptr_t diff = max ^ min; 1194 1195 // throw away enough low-order bits to make the diff vanish 1196 uintptr_t mask = (uintptr_t)(-1); 1197 while ((mask & diff) != 0) 1198 mask <<= 1; 1199 uintptr_t bits = (min & mask); 1200 assert(bits == (max & mask), "correct mask"); 1201 // check an intermediate value between min and max, just to make sure: 1202 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1203 1204 // require address alignment, too: 1205 mask |= (alignSize - 1); 1206 1207 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1208 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1209 } 1210 _verify_oop_mask = mask; 1211 _verify_oop_bits = bits; 1212 } 1213 1214 // Oop verification (see MacroAssembler::verify_oop) 1215 1216 uintptr_t Universe::verify_oop_mask() { 1217 return _verify_oop_mask; 1218 } 1219 1220 uintptr_t Universe::verify_oop_bits() { 1221 return _verify_oop_bits; 1222 } 1223 1224 uintptr_t Universe::verify_mark_mask() { 1225 return markWord::lock_mask_in_place; 1226 } 1227 1228 uintptr_t Universe::verify_mark_bits() { 1229 intptr_t mask = verify_mark_mask(); 1230 intptr_t bits = (intptr_t)markWord::prototype().value(); 1231 assert((bits & ~mask) == 0, "no stray header bits"); 1232 return bits; 1233 } 1234 #endif // PRODUCT 1235 1236 1237 void LatestMethodCache::init(Klass* k, Method* m) { 1238 if (!UseSharedSpaces) { 1239 _klass = k; 1240 } 1241 #ifndef PRODUCT 1242 else { 1243 // sharing initilization should have already set up _klass 1244 assert(_klass != NULL, "just checking"); 1245 } 1246 #endif 1247 1248 _method_idnum = m->method_idnum(); 1249 assert(_method_idnum >= 0, "sanity check"); 1250 } 1251 1252 1253 Method* LatestMethodCache::get_method() { 1254 if (klass() == NULL) return NULL; 1255 InstanceKlass* ik = InstanceKlass::cast(klass()); 1256 Method* m = ik->method_with_idnum(method_idnum()); 1257 assert(m != NULL, "sanity check"); 1258 return m; 1259 } 1260 1261 #ifdef ASSERT 1262 // Release dummy object(s) at bottom of heap 1263 bool Universe::release_fullgc_alot_dummy() { 1264 MutexLocker ml(FullGCALot_lock); 1265 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve(); 1266 if (fullgc_alot_dummy_array != NULL) { 1267 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) { 1268 // No more dummies to release, release entire array instead 1269 _fullgc_alot_dummy_array.release(Universe::vm_global()); 1270 _fullgc_alot_dummy_array = OopHandle(); // NULL out OopStorage pointer. 1271 return false; 1272 } 1273 1274 // Release dummy at bottom of old generation 1275 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1276 } 1277 return true; 1278 } 1279 1280 bool Universe::is_gc_active() { 1281 return heap()->is_gc_active(); 1282 } 1283 1284 bool Universe::is_in_heap(const void* p) { 1285 return heap()->is_in(p); 1286 } 1287 1288 #endif // ASSERT