1 /* 2 * Copyright (c) 1997, 2021, 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/instanceStackChunkKlass.hpp" 61 #include "oops/klass.inline.hpp" 62 #include "oops/objArrayOop.inline.hpp" 63 #include "oops/oop.inline.hpp" 64 #include "oops/oopHandle.inline.hpp" 65 #include "oops/typeArrayKlass.hpp" 66 #include "prims/resolvedMethodTable.hpp" 67 #include "runtime/arguments.hpp" 68 #include "runtime/atomic.hpp" 69 #include "runtime/flags/jvmFlagLimit.hpp" 70 #include "runtime/handles.inline.hpp" 71 #include "runtime/init.hpp" 72 #include "runtime/java.hpp" 73 #include "runtime/jniHandles.hpp" 74 #include "runtime/thread.inline.hpp" 75 #include "runtime/timerTrace.hpp" 76 #include "services/memoryService.hpp" 77 #include "utilities/align.hpp" 78 #include "utilities/autoRestore.hpp" 79 #include "utilities/debug.hpp" 80 #include "utilities/formatBuffer.hpp" 81 #include "utilities/macros.hpp" 82 #include "utilities/ostream.hpp" 83 #include "utilities/preserveException.hpp" 84 85 // Known objects 86 Klass* Universe::_typeArrayKlassObjs[T_LONG+1] = { NULL /*, NULL...*/ }; 87 Klass* Universe::_objectArrayKlassObj = NULL; 88 OopHandle Universe::_mirrors[T_VOID+1]; 89 90 OopHandle Universe::_main_thread_group; 91 OopHandle Universe::_system_thread_group; 92 OopHandle Universe::_the_empty_class_array; 93 OopHandle Universe::_the_null_string; 94 OopHandle Universe::_the_min_jint_string; 95 96 OopHandle Universe::_the_null_sentinel; 97 98 // _out_of_memory_errors is an objArray 99 enum OutOfMemoryInstance { _oom_java_heap, 100 _oom_c_heap, 101 _oom_metaspace, 102 _oom_class_metaspace, 103 _oom_array_size, 104 _oom_gc_overhead_limit, 105 _oom_realloc_objects, 106 _oom_retry, 107 _oom_count }; 108 109 OopHandle Universe::_out_of_memory_errors; 110 OopHandle Universe::_delayed_stack_overflow_error_message; 111 OopHandle Universe::_preallocated_out_of_memory_error_array; 112 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 113 114 OopHandle Universe::_null_ptr_exception_instance; 115 OopHandle Universe::_arithmetic_exception_instance; 116 OopHandle Universe::_virtual_machine_error_instance; 117 118 OopHandle Universe::_reference_pending_list; 119 120 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 121 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 122 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 123 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 124 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL; 125 LatestMethodCache* Universe::_do_stack_walk_cache = NULL; 126 127 long Universe::verify_flags = Universe::Verify_All; 128 129 Array<int>* Universe::_the_empty_int_array = NULL; 130 Array<u2>* Universe::_the_empty_short_array = NULL; 131 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 132 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array = NULL; 133 Array<Method*>* Universe::_the_empty_method_array = NULL; 134 135 // These variables are guarded by FullGCALot_lock. 136 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;) 137 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 138 139 // Heap 140 int Universe::_verify_count = 0; 141 142 // Oop verification (see MacroAssembler::verify_oop) 143 uintptr_t Universe::_verify_oop_mask = 0; 144 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 145 146 int Universe::_base_vtable_size = 0; 147 bool Universe::_bootstrapping = false; 148 bool Universe::_module_initialized = false; 149 bool Universe::_fully_initialized = false; 150 151 OopStorage* Universe::_vm_weak = NULL; 152 OopStorage* Universe::_vm_global = NULL; 153 154 CollectedHeap* Universe::_collectedHeap = NULL; 155 156 objArrayOop Universe::the_empty_class_array () { 157 return (objArrayOop)_the_empty_class_array.resolve(); 158 } 159 160 oop Universe::main_thread_group() { return _main_thread_group.resolve(); } 161 void Universe::set_main_thread_group(oop group) { _main_thread_group = OopHandle(vm_global(), group); } 162 163 oop Universe::system_thread_group() { return _system_thread_group.resolve(); } 164 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); } 165 166 oop Universe::the_null_string() { return _the_null_string.resolve(); } 167 oop Universe::the_min_jint_string() { return _the_min_jint_string.resolve(); } 168 169 oop Universe::null_ptr_exception_instance() { return _null_ptr_exception_instance.resolve(); } 170 oop Universe::arithmetic_exception_instance() { return _arithmetic_exception_instance.resolve(); } 171 oop Universe::virtual_machine_error_instance() { return _virtual_machine_error_instance.resolve(); } 172 173 oop Universe::the_null_sentinel() { return _the_null_sentinel.resolve(); } 174 175 oop Universe::int_mirror() { return check_mirror(_mirrors[T_INT].resolve()); } 176 oop Universe::float_mirror() { return check_mirror(_mirrors[T_FLOAT].resolve()); } 177 oop Universe::double_mirror() { return check_mirror(_mirrors[T_DOUBLE].resolve()); } 178 oop Universe::byte_mirror() { return check_mirror(_mirrors[T_BYTE].resolve()); } 179 oop Universe::bool_mirror() { return check_mirror(_mirrors[T_BOOLEAN].resolve()); } 180 oop Universe::char_mirror() { return check_mirror(_mirrors[T_CHAR].resolve()); } 181 oop Universe::long_mirror() { return check_mirror(_mirrors[T_LONG].resolve()); } 182 oop Universe::short_mirror() { return check_mirror(_mirrors[T_SHORT].resolve()); } 183 oop Universe::void_mirror() { return check_mirror(_mirrors[T_VOID].resolve()); } 184 185 oop Universe::java_mirror(BasicType t) { 186 assert((uint)t < T_VOID+1, "range check"); 187 return check_mirror(_mirrors[t].resolve()); 188 } 189 190 // Used by CDS dumping 191 void Universe::replace_mirror(BasicType t, oop new_mirror) { 192 Universe::_mirrors[t].replace(new_mirror); 193 } 194 195 void Universe::basic_type_classes_do(void f(Klass*)) { 196 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 197 f(_typeArrayKlassObjs[i]); 198 } 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 } 230 231 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive 232 void Universe::serialize(SerializeClosure* f) { 233 234 #if INCLUDE_CDS_JAVA_HEAP 235 { 236 oop mirror_oop; 237 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 238 if (f->reading()) { 239 f->do_oop(&mirror_oop); // read from archive 240 assert(oopDesc::is_oop_or_null(mirror_oop), "is oop"); 241 // Only create an OopHandle for non-null mirrors 242 if (mirror_oop != NULL) { 243 _mirrors[i] = OopHandle(vm_global(), mirror_oop); 244 } 245 } else { 246 if (HeapShared::can_write()) { 247 mirror_oop = _mirrors[i].resolve(); 248 } else { 249 mirror_oop = NULL; 250 } 251 f->do_oop(&mirror_oop); // write to archive 252 } 253 if (mirror_oop != NULL) { // may be null if archived heap is disabled 254 java_lang_Class::update_archived_primitive_mirror_native_pointers(mirror_oop); 255 } 256 } 257 } 258 #endif 259 260 for (int i = 0; i < T_LONG+1; i++) { 261 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 262 } 263 264 f->do_ptr((void**)&_objectArrayKlassObj); 265 f->do_ptr((void**)&_the_array_interfaces_array); 266 f->do_ptr((void**)&_the_empty_int_array); 267 f->do_ptr((void**)&_the_empty_short_array); 268 f->do_ptr((void**)&_the_empty_method_array); 269 f->do_ptr((void**)&_the_empty_klass_array); 270 f->do_ptr((void**)&_the_empty_instance_klass_array); 271 _finalizer_register_cache->serialize(f); 272 _loader_addClass_cache->serialize(f); 273 _throw_illegal_access_error_cache->serialize(f); 274 _throw_no_such_method_error_cache->serialize(f); 275 _do_stack_walk_cache->serialize(f); 276 } 277 278 279 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 280 if (size < alignment || size % alignment != 0) { 281 vm_exit_during_initialization( 282 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 283 } 284 } 285 286 void initialize_basic_type_klass(Klass* k, TRAPS) { 287 Klass* ok = vmClasses::Object_klass(); 288 #if INCLUDE_CDS 289 if (UseSharedSpaces) { 290 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 291 assert(k->super() == ok, "u3"); 292 if (k->is_instance_klass()) { 293 InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK); 294 } else { 295 ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK); 296 } 297 } else 298 #endif 299 { 300 k->initialize_supers(ok, NULL, CHECK); 301 } 302 k->append_to_sibling_list(); 303 } 304 305 void Universe::genesis(TRAPS) { 306 ResourceMark rm(THREAD); 307 HandleMark hm(THREAD); 308 309 { AutoModifyRestore<bool> temporarily(_bootstrapping, true); 310 311 { MutexLocker mc(THREAD, Compile_lock); 312 313 java_lang_Class::allocate_fixup_lists(); 314 315 // determine base vtable size; without that we cannot create the array klasses 316 compute_base_vtable_size(); 317 318 if (!UseSharedSpaces) { 319 for (int i = T_BOOLEAN; i < T_LONG+1; i++) { 320 _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK); 321 } 322 323 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 324 325 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 326 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 327 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 328 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 329 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 330 _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK); 331 } 332 } 333 334 vmSymbols::initialize(); 335 336 SystemDictionary::initialize(CHECK); 337 338 // Create string constants 339 oop s = StringTable::intern("null", CHECK); 340 _the_null_string = OopHandle(vm_global(), s); 341 s = StringTable::intern("-2147483648", CHECK); 342 _the_min_jint_string = OopHandle(vm_global(), s); 343 344 345 #if INCLUDE_CDS 346 if (UseSharedSpaces) { 347 // Verify shared interfaces array. 348 assert(_the_array_interfaces_array->at(0) == 349 vmClasses::Cloneable_klass(), "u3"); 350 assert(_the_array_interfaces_array->at(1) == 351 vmClasses::Serializable_klass(), "u3"); 352 } else 353 #endif 354 { 355 // Set up shared interfaces array. (Do this before supers are set up.) 356 _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass()); 357 _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass()); 358 } 359 360 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 361 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 362 initialize_basic_type_klass(floatArrayKlassObj(), CHECK); 363 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 364 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 365 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 366 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 367 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 368 369 InstanceStackChunkKlass::init_offset_of_stack(); 370 } // end of core bootstrapping 371 372 { 373 Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK); 374 _the_null_sentinel = OopHandle(vm_global(), tns()); 375 } 376 377 // Create a handle for reference_pending_list 378 _reference_pending_list = OopHandle(vm_global(), NULL); 379 380 // Maybe this could be lifted up now that object array can be initialized 381 // during the bootstrapping. 382 383 // OLD 384 // Initialize _objectArrayKlass after core bootstraping to make 385 // sure the super class is set up properly for _objectArrayKlass. 386 // --- 387 // NEW 388 // Since some of the old system object arrays have been converted to 389 // ordinary object arrays, _objectArrayKlass will be loaded when 390 // SystemDictionary::initialize(CHECK); is run. See the extra check 391 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 392 _objectArrayKlassObj = InstanceKlass:: 393 cast(vmClasses::Object_klass())->array_klass(1, CHECK); 394 // OLD 395 // Add the class to the class hierarchy manually to make sure that 396 // its vtable is initialized after core bootstrapping is completed. 397 // --- 398 // New 399 // Have already been initialized. 400 _objectArrayKlassObj->append_to_sibling_list(); 401 402 #ifdef ASSERT 403 if (FullGCALot) { 404 // Allocate an array of dummy objects. 405 // We'd like these to be at the bottom of the old generation, 406 // so that when we free one and then collect, 407 // (almost) the whole heap moves 408 // and we find out if we actually update all the oops correctly. 409 // But we can't allocate directly in the old generation, 410 // so we allocate wherever, and hope that the first collection 411 // moves these objects to the bottom of the old generation. 412 int size = FullGCALotDummies * 2; 413 414 objArrayOop naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK); 415 objArrayHandle dummy_array(THREAD, naked_array); 416 int i = 0; 417 while (i < size) { 418 // Allocate dummy in old generation 419 oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK); 420 dummy_array->obj_at_put(i++, dummy); 421 } 422 { 423 // Only modify the global variable inside the mutex. 424 // If we had a race to here, the other dummy_array instances 425 // and their elements just get dropped on the floor, which is fine. 426 MutexLocker ml(THREAD, FullGCALot_lock); 427 if (_fullgc_alot_dummy_array.is_empty()) { 428 _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array()); 429 } 430 } 431 assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking"); 432 } 433 #endif 434 } 435 436 void Universe::initialize_basic_type_mirrors(TRAPS) { 437 #if INCLUDE_CDS_JAVA_HEAP 438 if (UseSharedSpaces && 439 HeapShared::are_archived_mirrors_available() && 440 _mirrors[T_INT].resolve() != NULL) { 441 assert(HeapShared::can_use(), "Sanity"); 442 443 // check that all mirrors are mapped also 444 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 445 if (!is_reference_type((BasicType)i)) { 446 oop m = _mirrors[i].resolve(); 447 assert(m != NULL, "archived mirrors should not be NULL"); 448 } 449 } 450 } else 451 // _mirror[T_INT} could be NULL if archived heap is not mapped. 452 #endif 453 { 454 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 455 BasicType bt = (BasicType)i; 456 if (!is_reference_type(bt)) { 457 oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK); 458 _mirrors[i] = OopHandle(vm_global(), m); 459 } 460 } 461 } 462 } 463 464 void Universe::fixup_mirrors(TRAPS) { 465 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 466 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 467 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 468 // that the number of objects allocated at this point is very small. 469 assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded"); 470 HandleMark hm(THREAD); 471 472 if (!UseSharedSpaces) { 473 // Cache the start of the static fields 474 InstanceMirrorKlass::init_offset_of_static_fields(); 475 } 476 477 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 478 int list_length = list->length(); 479 for (int i = 0; i < list_length; i++) { 480 Klass* k = list->at(i); 481 assert(k->is_klass(), "List should only hold classes"); 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 static void reinitialize_vtables() { 521 // The vtables are initialized by starting at java.lang.Object and 522 // initializing through the subclass links, so that the super 523 // classes are always initialized first. 524 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) { 525 Klass* sub = iter.klass(); 526 sub->vtable().initialize_vtable(); 527 } 528 } 529 530 static void reinitialize_itables() { 531 532 class ReinitTableClosure : public KlassClosure { 533 public: 534 void do_klass(Klass* k) { 535 if (k->is_instance_klass()) { 536 InstanceKlass::cast(k)->itable().initialize_itable(); 537 } 538 } 539 }; 540 541 MutexLocker mcld(ClassLoaderDataGraph_lock); 542 ReinitTableClosure cl; 543 ClassLoaderDataGraph::classes_do(&cl); 544 } 545 546 547 bool Universe::on_page_boundary(void* addr) { 548 return is_aligned(addr, os::vm_page_size()); 549 } 550 551 // the array of preallocated errors with backtraces 552 objArrayOop Universe::preallocated_out_of_memory_errors() { 553 return (objArrayOop)_preallocated_out_of_memory_error_array.resolve(); 554 } 555 556 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); } 557 558 oop Universe::out_of_memory_error_java_heap() { 559 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap)); 560 } 561 562 oop Universe::out_of_memory_error_c_heap() { 563 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap)); 564 } 565 566 oop Universe::out_of_memory_error_metaspace() { 567 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace)); 568 } 569 570 oop Universe::out_of_memory_error_class_metaspace() { 571 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace)); 572 } 573 574 oop Universe::out_of_memory_error_array_size() { 575 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size)); 576 } 577 578 oop Universe::out_of_memory_error_gc_overhead_limit() { 579 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit)); 580 } 581 582 oop Universe::out_of_memory_error_realloc_objects() { 583 return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects)); 584 } 585 586 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM 587 oop Universe::out_of_memory_error_retry() { return out_of_memory_errors()->obj_at(_oom_retry); } 588 oop Universe::delayed_stack_overflow_error_message() { return _delayed_stack_overflow_error_message.resolve(); } 589 590 591 bool Universe::should_fill_in_stack_trace(Handle throwable) { 592 // never attempt to fill in the stack trace of preallocated errors that do not have 593 // backtrace. These errors are kept alive forever and may be "re-used" when all 594 // preallocated errors with backtrace have been consumed. Also need to avoid 595 // a potential loop which could happen if an out of memory occurs when attempting 596 // to allocate the backtrace. 597 objArrayOop preallocated_oom = out_of_memory_errors(); 598 for (int i = 0; i < _oom_count; i++) { 599 if (throwable() == preallocated_oom->obj_at(i)) { 600 return false; 601 } 602 } 603 return true; 604 } 605 606 607 oop Universe::gen_out_of_memory_error(oop default_err) { 608 // generate an out of memory error: 609 // - if there is a preallocated error and stack traces are available 610 // (j.l.Throwable is initialized), then return the preallocated 611 // error with a filled in stack trace, and with the message 612 // provided by the default error. 613 // - otherwise, return the default error, without a stack trace. 614 int next; 615 if ((_preallocated_out_of_memory_error_avail_count > 0) && 616 vmClasses::Throwable_klass()->is_initialized()) { 617 next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1); 618 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 619 } else { 620 next = -1; 621 } 622 if (next < 0) { 623 // all preallocated errors have been used. 624 // return default 625 return default_err; 626 } else { 627 JavaThread* current = JavaThread::current(); 628 Handle default_err_h(current, default_err); 629 // get the error object at the slot and set set it to NULL so that the 630 // array isn't keeping it alive anymore. 631 Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next)); 632 assert(exc() != NULL, "slot has been used already"); 633 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 634 635 // use the message from the default error 636 oop msg = java_lang_Throwable::message(default_err_h()); 637 assert(msg != NULL, "no message"); 638 java_lang_Throwable::set_message(exc(), msg); 639 640 // populate the stack trace and return it. 641 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 642 return exc(); 643 } 644 } 645 646 // Setup preallocated OutOfMemoryError errors 647 void Universe::create_preallocated_out_of_memory_errors(TRAPS) { 648 InstanceKlass* ik = vmClasses::OutOfMemoryError_klass(); 649 objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK); 650 objArrayHandle oom_array(THREAD, oa); 651 652 for (int i = 0; i < _oom_count; i++) { 653 oop oom_obj = ik->allocate_instance(CHECK); 654 oom_array->obj_at_put(i, oom_obj); 655 } 656 _out_of_memory_errors = OopHandle(vm_global(), oom_array()); 657 658 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK); 659 java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg()); 660 661 msg = java_lang_String::create_from_str("C heap space", CHECK); 662 java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg()); 663 664 msg = java_lang_String::create_from_str("Metaspace", CHECK); 665 java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg()); 666 667 msg = java_lang_String::create_from_str("Compressed class space", CHECK); 668 java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg()); 669 670 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK); 671 java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg()); 672 673 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK); 674 java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg()); 675 676 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK); 677 java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg()); 678 679 msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK); 680 java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg()); 681 682 // Setup the array of errors that have preallocated backtrace 683 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 684 objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK); 685 _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance); 686 objArrayHandle preallocated_oom_array(THREAD, instance); 687 688 for (int i=0; i<len; i++) { 689 oop err = ik->allocate_instance(CHECK); 690 Handle err_h(THREAD, err); 691 java_lang_Throwable::allocate_backtrace(err_h, CHECK); 692 preallocated_oom_array->obj_at_put(i, err_h()); 693 } 694 _preallocated_out_of_memory_error_avail_count = (jint)len; 695 } 696 697 intptr_t Universe::_non_oop_bits = 0; 698 699 void* Universe::non_oop_word() { 700 // Neither the high bits nor the low bits of this value is allowed 701 // to look like (respectively) the high or low bits of a real oop. 702 // 703 // High and low are CPU-specific notions, but low always includes 704 // the low-order bit. Since oops are always aligned at least mod 4, 705 // setting the low-order bit will ensure that the low half of the 706 // word will never look like that of a real oop. 707 // 708 // Using the OS-supplied non-memory-address word (usually 0 or -1) 709 // will take care of the high bits, however many there are. 710 711 if (_non_oop_bits == 0) { 712 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 713 } 714 715 return (void*)_non_oop_bits; 716 } 717 718 bool Universe::contains_non_oop_word(void* p) { 719 return *(void**)p == non_oop_word(); 720 } 721 722 static void initialize_global_behaviours() { 723 CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour()); 724 } 725 726 jint universe_init() { 727 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 728 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 729 "LogHeapWordSize is incorrect."); 730 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 731 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 732 "oop size is not not a multiple of HeapWord size"); 733 734 TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime)); 735 736 initialize_global_behaviours(); 737 738 GCLogPrecious::initialize(); 739 740 GCConfig::arguments()->initialize_heap_sizes(); 741 742 jint status = Universe::initialize_heap(); 743 if (status != JNI_OK) { 744 return status; 745 } 746 747 Universe::initialize_tlab(); 748 749 Metaspace::global_initialize(); 750 751 // Initialize performance counters for metaspaces 752 MetaspaceCounters::initialize_performance_counters(); 753 754 // Checks 'AfterMemoryInit' constraints. 755 if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) { 756 return JNI_EINVAL; 757 } 758 759 // Create memory for metadata. Must be after initializing heap for 760 // DumpSharedSpaces. 761 ClassLoaderData::init_null_class_loader_data(); 762 763 // We have a heap so create the Method* caches before 764 // Metaspace::initialize_shared_spaces() tries to populate them. 765 Universe::_finalizer_register_cache = new LatestMethodCache(); 766 Universe::_loader_addClass_cache = new LatestMethodCache(); 767 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 768 Universe::_throw_no_such_method_error_cache = new LatestMethodCache(); 769 Universe::_do_stack_walk_cache = new LatestMethodCache(); 770 771 #if INCLUDE_CDS 772 DynamicArchive::check_for_dynamic_dump(); 773 if (UseSharedSpaces) { 774 // Read the data structures supporting the shared spaces (shared 775 // system dictionary, symbol table, etc.). After that, access to 776 // the file (other than the mapped regions) is no longer needed, and 777 // the file is closed. Closing the file does not affect the 778 // currently mapped regions. 779 MetaspaceShared::initialize_shared_spaces(); 780 StringTable::create_table(); 781 if (HeapShared::is_loaded()) { 782 StringTable::transfer_shared_strings_to_local_table(); 783 } 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 ThreadLocalAllocBuffer::startup_initialization(); 818 } 819 } 820 821 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 822 823 assert(alignment <= Arguments::conservative_max_heap_alignment(), 824 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 825 alignment, Arguments::conservative_max_heap_alignment()); 826 827 size_t total_reserved = align_up(heap_size, alignment); 828 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 829 "heap size is too big for compressed oops"); 830 831 size_t page_size = os::vm_page_size(); 832 if (UseLargePages && is_aligned(alignment, os::large_page_size())) { 833 page_size = os::large_page_size(); 834 } else { 835 // Parallel is the only collector that might opt out of using large pages 836 // for the heap. 837 assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages"); 838 } 839 840 // Now create the space. 841 ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt); 842 843 if (total_rs.is_reserved()) { 844 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 845 "must be exactly of required size and alignment"); 846 // We are good. 847 848 if (AllocateHeapAt != NULL) { 849 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt); 850 } 851 852 if (UseCompressedOops) { 853 CompressedOops::initialize(total_rs); 854 } 855 856 Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end()); 857 858 return total_rs; 859 } 860 861 vm_exit_during_initialization( 862 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 863 total_reserved/K)); 864 865 // satisfy compiler 866 ShouldNotReachHere(); 867 return ReservedHeapSpace(0, 0, os::vm_page_size()); 868 } 869 870 OopStorage* Universe::vm_weak() { 871 return Universe::_vm_weak; 872 } 873 874 OopStorage* Universe::vm_global() { 875 return Universe::_vm_global; 876 } 877 878 void Universe::oopstorage_init() { 879 Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal); 880 Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal); 881 } 882 883 void universe_oopstorage_init() { 884 Universe::oopstorage_init(); 885 } 886 887 void initialize_known_method(LatestMethodCache* method_cache, 888 InstanceKlass* ik, 889 const char* method, 890 Symbol* signature, 891 bool is_static, TRAPS) 892 { 893 TempNewSymbol name = SymbolTable::new_symbol(method); 894 Method* m = NULL; 895 // The klass must be linked before looking up the method. 896 if (!ik->link_class_or_fail(THREAD) || 897 ((m = ik->find_method(name, signature)) == NULL) || 898 is_static != m->is_static()) { 899 ResourceMark rm(THREAD); 900 // NoSuchMethodException doesn't actually work because it tries to run the 901 // <init> function before java_lang_Class is linked. Print error and exit. 902 vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method", 903 ik->name()->as_C_string(), method)); 904 } 905 method_cache->init(ik, m); 906 } 907 908 void Universe::initialize_known_methods(TRAPS) { 909 // Set up static method for registering finalizers 910 initialize_known_method(_finalizer_register_cache, 911 vmClasses::Finalizer_klass(), 912 "register", 913 vmSymbols::object_void_signature(), true, CHECK); 914 915 initialize_known_method(_throw_illegal_access_error_cache, 916 vmClasses::internal_Unsafe_klass(), 917 "throwIllegalAccessError", 918 vmSymbols::void_method_signature(), true, CHECK); 919 920 initialize_known_method(_throw_no_such_method_error_cache, 921 vmClasses::internal_Unsafe_klass(), 922 "throwNoSuchMethodError", 923 vmSymbols::void_method_signature(), true, CHECK); 924 925 // Set up method for registering loaded classes in class loader vector 926 initialize_known_method(_loader_addClass_cache, 927 vmClasses::ClassLoader_klass(), 928 "addClass", 929 vmSymbols::class_void_signature(), false, CHECK); 930 931 // Set up method for stack walking 932 initialize_known_method(_do_stack_walk_cache, 933 vmClasses::AbstractStackWalker_klass(), 934 "doStackWalk", 935 vmSymbols::doStackWalk_signature(), false, CHECK); 936 } 937 938 void universe2_init() { 939 EXCEPTION_MARK; 940 Universe::genesis(CATCH); 941 } 942 943 // Set after initialization of the module runtime, call_initModuleRuntime 944 void universe_post_module_init() { 945 Universe::_module_initialized = true; 946 } 947 948 bool universe_post_init() { 949 assert(!is_init_completed(), "Error: initialization not yet completed!"); 950 Universe::_fully_initialized = true; 951 EXCEPTION_MARK; 952 if (!UseSharedSpaces) { 953 reinitialize_vtables(); 954 reinitialize_itables(); 955 } 956 957 HandleMark hm(THREAD); 958 // Setup preallocated empty java.lang.Class array for Method reflection. 959 960 objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false); 961 Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array); 962 963 // Setup preallocated OutOfMemoryError errors 964 Universe::create_preallocated_out_of_memory_errors(CHECK_false); 965 966 oop instance; 967 // Setup preallocated cause message for delayed StackOverflowError 968 if (StackReservedPages > 0) { 969 instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false); 970 Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance); 971 } 972 973 // Setup preallocated NullPointerException 974 // (this is currently used for a cheap & dirty solution in compiler exception handling) 975 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 976 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 977 Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance); 978 979 // Setup preallocated ArithmeticException 980 // (this is currently used for a cheap & dirty solution in compiler exception handling) 981 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 982 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 983 Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance); 984 985 // Virtual Machine Error for when we get into a situation we can't resolve 986 k = vmClasses::VirtualMachineError_klass(); 987 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 988 if (!linked) { 989 tty->print_cr("Unable to link/verify VirtualMachineError class"); 990 return false; // initialization failed 991 } 992 instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 993 Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance); 994 995 Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 996 java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg()); 997 998 Universe::initialize_known_methods(CHECK_false); 999 1000 // This needs to be done before the first scavenge/gc, since 1001 // it's an input to soft ref clearing policy. 1002 { 1003 MutexLocker x(THREAD, Heap_lock); 1004 Universe::heap()->update_capacity_and_used_at_gc(); 1005 } 1006 1007 // ("weak") refs processing infrastructure initialization 1008 Universe::heap()->post_initialize(); 1009 1010 MemoryService::add_metaspace_memory_pools(); 1011 1012 MemoryService::set_universe_heap(Universe::heap()); 1013 #if INCLUDE_CDS 1014 MetaspaceShared::post_initialize(CHECK_false); 1015 #endif 1016 return true; 1017 } 1018 1019 1020 void Universe::compute_base_vtable_size() { 1021 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1022 } 1023 1024 void Universe::print_on(outputStream* st) { 1025 GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread. 1026 st->print_cr("Heap"); 1027 heap()->print_on(st); 1028 } 1029 1030 void Universe::print_heap_at_SIGBREAK() { 1031 if (PrintHeapAtSIGBREAK) { 1032 print_on(tty); 1033 tty->cr(); 1034 tty->flush(); 1035 } 1036 } 1037 1038 void Universe::initialize_verify_flags() { 1039 verify_flags = 0; 1040 const char delimiter[] = " ,"; 1041 1042 size_t length = strlen(VerifySubSet); 1043 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1044 strncpy(subset_list, VerifySubSet, length + 1); 1045 char* save_ptr; 1046 1047 char* token = strtok_r(subset_list, delimiter, &save_ptr); 1048 while (token != NULL) { 1049 if (strcmp(token, "threads") == 0) { 1050 verify_flags |= Verify_Threads; 1051 } else if (strcmp(token, "heap") == 0) { 1052 verify_flags |= Verify_Heap; 1053 } else if (strcmp(token, "symbol_table") == 0) { 1054 verify_flags |= Verify_SymbolTable; 1055 } else if (strcmp(token, "string_table") == 0) { 1056 verify_flags |= Verify_StringTable; 1057 } else if (strcmp(token, "codecache") == 0) { 1058 verify_flags |= Verify_CodeCache; 1059 } else if (strcmp(token, "dictionary") == 0) { 1060 verify_flags |= Verify_SystemDictionary; 1061 } else if (strcmp(token, "classloader_data_graph") == 0) { 1062 verify_flags |= Verify_ClassLoaderDataGraph; 1063 } else if (strcmp(token, "metaspace") == 0) { 1064 verify_flags |= Verify_MetaspaceUtils; 1065 } else if (strcmp(token, "jni_handles") == 0) { 1066 verify_flags |= Verify_JNIHandles; 1067 } else if (strcmp(token, "codecache_oops") == 0) { 1068 verify_flags |= Verify_CodeCacheOops; 1069 } else if (strcmp(token, "resolved_method_table") == 0) { 1070 verify_flags |= Verify_ResolvedMethodTable; 1071 } else if (strcmp(token, "stringdedup") == 0) { 1072 verify_flags |= Verify_StringDedup; 1073 } else { 1074 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1075 } 1076 token = strtok_r(NULL, delimiter, &save_ptr); 1077 } 1078 FREE_C_HEAP_ARRAY(char, subset_list); 1079 } 1080 1081 bool Universe::should_verify_subset(uint subset) { 1082 if (verify_flags & subset) { 1083 return true; 1084 } 1085 return false; 1086 } 1087 1088 void Universe::verify(VerifyOption option, const char* prefix) { 1089 COMPILER2_PRESENT( 1090 assert(!DerivedPointerTable::is_active(), 1091 "DPT should not be active during verification " 1092 "(of thread stacks below)"); 1093 ) 1094 1095 Thread* thread = Thread::current(); 1096 ResourceMark rm(thread); 1097 HandleMark hm(thread); // Handles created during verification can be zapped 1098 _verify_count++; 1099 1100 FormatBuffer<> title("Verifying %s", prefix); 1101 GCTraceTime(Info, gc, verify) tm(title.buffer()); 1102 if (should_verify_subset(Verify_Threads)) { 1103 log_debug(gc, verify)("Threads"); 1104 Threads::verify(); 1105 } 1106 if (should_verify_subset(Verify_Heap)) { 1107 log_debug(gc, verify)("Heap"); 1108 heap()->verify(option); 1109 } 1110 if (should_verify_subset(Verify_SymbolTable)) { 1111 log_debug(gc, verify)("SymbolTable"); 1112 SymbolTable::verify(); 1113 } 1114 if (should_verify_subset(Verify_StringTable)) { 1115 log_debug(gc, verify)("StringTable"); 1116 StringTable::verify(); 1117 } 1118 if (should_verify_subset(Verify_CodeCache)) { 1119 log_debug(gc, verify)("CodeCache"); 1120 CodeCache::verify(); 1121 } 1122 if (should_verify_subset(Verify_SystemDictionary)) { 1123 log_debug(gc, verify)("SystemDictionary"); 1124 SystemDictionary::verify(); 1125 } 1126 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1127 log_debug(gc, verify)("ClassLoaderDataGraph"); 1128 ClassLoaderDataGraph::verify(); 1129 } 1130 if (should_verify_subset(Verify_MetaspaceUtils)) { 1131 log_debug(gc, verify)("MetaspaceUtils"); 1132 DEBUG_ONLY(MetaspaceUtils::verify();) 1133 } 1134 if (should_verify_subset(Verify_JNIHandles)) { 1135 log_debug(gc, verify)("JNIHandles"); 1136 JNIHandles::verify(); 1137 } 1138 if (should_verify_subset(Verify_CodeCacheOops)) { 1139 log_debug(gc, verify)("CodeCache Oops"); 1140 CodeCache::verify_oops(); 1141 } 1142 if (should_verify_subset(Verify_ResolvedMethodTable)) { 1143 log_debug(gc, verify)("ResolvedMethodTable Oops"); 1144 ResolvedMethodTable::verify(); 1145 } 1146 if (should_verify_subset(Verify_StringDedup)) { 1147 log_debug(gc, verify)("String Deduplication"); 1148 StringDedup::verify(); 1149 } 1150 } 1151 1152 1153 #ifndef PRODUCT 1154 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1155 assert(low_boundary < high_boundary, "bad interval"); 1156 1157 // decide which low-order bits we require to be clear: 1158 size_t alignSize = MinObjAlignmentInBytes; 1159 size_t min_object_size = CollectedHeap::min_fill_size(); 1160 1161 // make an inclusive limit: 1162 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1163 uintptr_t min = (uintptr_t)low_boundary; 1164 assert(min < max, "bad interval"); 1165 uintptr_t diff = max ^ min; 1166 1167 // throw away enough low-order bits to make the diff vanish 1168 uintptr_t mask = (uintptr_t)(-1); 1169 while ((mask & diff) != 0) 1170 mask <<= 1; 1171 uintptr_t bits = (min & mask); 1172 assert(bits == (max & mask), "correct mask"); 1173 // check an intermediate value between min and max, just to make sure: 1174 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1175 1176 // require address alignment, too: 1177 mask |= (alignSize - 1); 1178 1179 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1180 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1181 } 1182 _verify_oop_mask = mask; 1183 _verify_oop_bits = bits; 1184 } 1185 1186 // Oop verification (see MacroAssembler::verify_oop) 1187 1188 uintptr_t Universe::verify_oop_mask() { 1189 return _verify_oop_mask; 1190 } 1191 1192 uintptr_t Universe::verify_oop_bits() { 1193 return _verify_oop_bits; 1194 } 1195 1196 uintptr_t Universe::verify_mark_mask() { 1197 return markWord::lock_mask_in_place; 1198 } 1199 1200 uintptr_t Universe::verify_mark_bits() { 1201 intptr_t mask = verify_mark_mask(); 1202 intptr_t bits = (intptr_t)markWord::prototype().value(); 1203 assert((bits & ~mask) == 0, "no stray header bits"); 1204 return bits; 1205 } 1206 #endif // PRODUCT 1207 1208 1209 void LatestMethodCache::init(Klass* k, Method* m) { 1210 if (!UseSharedSpaces) { 1211 _klass = k; 1212 } 1213 #ifndef PRODUCT 1214 else { 1215 // sharing initilization should have already set up _klass 1216 assert(_klass != NULL, "just checking"); 1217 } 1218 #endif 1219 1220 _method_idnum = m->method_idnum(); 1221 assert(_method_idnum >= 0, "sanity check"); 1222 } 1223 1224 1225 Method* LatestMethodCache::get_method() { 1226 if (klass() == NULL) return NULL; 1227 InstanceKlass* ik = InstanceKlass::cast(klass()); 1228 Method* m = ik->method_with_idnum(method_idnum()); 1229 assert(m != NULL, "sanity check"); 1230 return m; 1231 } 1232 1233 #ifdef ASSERT 1234 // Release dummy object(s) at bottom of heap 1235 bool Universe::release_fullgc_alot_dummy() { 1236 MutexLocker ml(FullGCALot_lock); 1237 objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve(); 1238 if (fullgc_alot_dummy_array != NULL) { 1239 if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) { 1240 // No more dummies to release, release entire array instead 1241 _fullgc_alot_dummy_array.release(Universe::vm_global()); 1242 return false; 1243 } 1244 1245 // Release dummy at bottom of old generation 1246 fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1247 } 1248 return true; 1249 } 1250 1251 bool Universe::is_gc_active() { 1252 return heap()->is_gc_active(); 1253 } 1254 1255 bool Universe::is_in_heap(const void* p) { 1256 return heap()->is_in(p); 1257 } 1258 1259 #endif // ASSERT --- EOF ---