1 /* 2 * Copyright (c) 1997, 2015, 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 "classfile/classLoader.hpp" 27 #include "classfile/classLoaderData.hpp" 28 #include "classfile/javaClasses.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "code/codeCache.hpp" 33 #include "code/dependencies.hpp" 34 #include "gc_interface/collectedHeap.inline.hpp" 35 #include "interpreter/interpreter.hpp" 36 #include "memory/cardTableModRefBS.hpp" 37 #include "memory/filemap.hpp" 38 #include "memory/gcLocker.inline.hpp" 39 #include "memory/genCollectedHeap.hpp" 40 #include "memory/genRemSet.hpp" 41 #include "memory/generation.hpp" 42 #include "memory/metadataFactory.hpp" 43 #include "memory/metaspaceShared.hpp" 44 #include "memory/oopFactory.hpp" 45 #include "memory/space.hpp" 46 #include "memory/universe.hpp" 47 #include "memory/universe.inline.hpp" 48 #include "oops/constantPool.hpp" 49 #include "oops/instanceClassLoaderKlass.hpp" 50 #include "oops/instanceKlass.hpp" 51 #include "oops/instanceMirrorKlass.hpp" 52 #include "oops/instanceRefKlass.hpp" 53 #include "oops/oop.inline.hpp" 54 #include "oops/typeArrayKlass.hpp" 55 #include "prims/jvmtiRedefineClassesTrace.hpp" 56 #include "runtime/arguments.hpp" 57 #include "runtime/atomic.inline.hpp" 58 #include "runtime/deoptimization.hpp" 59 #include "runtime/fprofiler.hpp" 60 #include "runtime/handles.inline.hpp" 61 #include "runtime/init.hpp" 62 #include "runtime/java.hpp" 63 #include "runtime/javaCalls.hpp" 64 #include "runtime/sharedRuntime.hpp" 65 #include "runtime/synchronizer.hpp" 66 #include "runtime/thread.inline.hpp" 67 #include "runtime/timer.hpp" 68 #include "runtime/vm_operations.hpp" 69 #include "services/memoryService.hpp" 70 #include "utilities/copy.hpp" 71 #include "utilities/events.hpp" 72 #include "utilities/hashtable.inline.hpp" 73 #include "utilities/preserveException.hpp" 74 #include "utilities/macros.hpp" 75 #if INCLUDE_ALL_GCS 76 #include "gc_implementation/shared/adaptiveSizePolicy.hpp" 77 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp" 78 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 79 #include "gc_implementation/g1/g1CollectorPolicy_ext.hpp" 80 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 81 #endif // INCLUDE_ALL_GCS 82 #if INCLUDE_CDS 83 #include "classfile/sharedClassUtil.hpp" 84 #endif 85 86 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 87 88 // Known objects 89 Klass* Universe::_boolArrayKlassObj = NULL; 90 Klass* Universe::_byteArrayKlassObj = NULL; 91 Klass* Universe::_charArrayKlassObj = NULL; 92 Klass* Universe::_intArrayKlassObj = NULL; 93 Klass* Universe::_shortArrayKlassObj = NULL; 94 Klass* Universe::_longArrayKlassObj = NULL; 95 Klass* Universe::_singleArrayKlassObj = NULL; 96 Klass* Universe::_doubleArrayKlassObj = NULL; 97 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 98 Klass* Universe::_objectArrayKlassObj = NULL; 99 oop Universe::_int_mirror = NULL; 100 oop Universe::_float_mirror = NULL; 101 oop Universe::_double_mirror = NULL; 102 oop Universe::_byte_mirror = NULL; 103 oop Universe::_bool_mirror = NULL; 104 oop Universe::_char_mirror = NULL; 105 oop Universe::_long_mirror = NULL; 106 oop Universe::_short_mirror = NULL; 107 oop Universe::_void_mirror = NULL; 108 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 109 oop Universe::_main_thread_group = NULL; 110 oop Universe::_system_thread_group = NULL; 111 objArrayOop Universe::_the_empty_class_klass_array = NULL; 112 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 113 oop Universe::_the_null_string = NULL; 114 oop Universe::_the_min_jint_string = NULL; 115 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 116 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 117 LatestMethodCache* Universe::_pd_implies_cache = NULL; 118 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 119 oop Universe::_out_of_memory_error_java_heap = NULL; 120 oop Universe::_out_of_memory_error_metaspace = NULL; 121 oop Universe::_out_of_memory_error_class_metaspace = NULL; 122 oop Universe::_out_of_memory_error_array_size = NULL; 123 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 124 oop Universe::_out_of_memory_error_realloc_objects = NULL; 125 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 126 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 127 bool Universe::_verify_in_progress = false; 128 oop Universe::_null_ptr_exception_instance = NULL; 129 oop Universe::_arithmetic_exception_instance = NULL; 130 oop Universe::_virtual_machine_error_instance = NULL; 131 oop Universe::_vm_exception = NULL; 132 oop Universe::_allocation_context_notification_obj = NULL; 133 134 Array<int>* Universe::_the_empty_int_array = NULL; 135 Array<u2>* Universe::_the_empty_short_array = NULL; 136 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 137 Array<Method*>* Universe::_the_empty_method_array = NULL; 138 139 // These variables are guarded by FullGCALot_lock. 140 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 141 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 142 143 // Heap 144 int Universe::_verify_count = 0; 145 146 int Universe::_base_vtable_size = 0; 147 bool Universe::_bootstrapping = false; 148 bool Universe::_fully_initialized = false; 149 150 size_t Universe::_heap_capacity_at_last_gc; 151 size_t Universe::_heap_used_at_last_gc = 0; 152 153 CollectedHeap* Universe::_collectedHeap = NULL; 154 155 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 156 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 157 address Universe::_narrow_ptrs_base; 158 159 void Universe::basic_type_classes_do(void f(Klass*)) { 160 f(boolArrayKlassObj()); 161 f(byteArrayKlassObj()); 162 f(charArrayKlassObj()); 163 f(intArrayKlassObj()); 164 f(shortArrayKlassObj()); 165 f(longArrayKlassObj()); 166 f(singleArrayKlassObj()); 167 f(doubleArrayKlassObj()); 168 } 169 170 void Universe::oops_do(OopClosure* f, bool do_all) { 171 172 f->do_oop((oop*) &_int_mirror); 173 f->do_oop((oop*) &_float_mirror); 174 f->do_oop((oop*) &_double_mirror); 175 f->do_oop((oop*) &_byte_mirror); 176 f->do_oop((oop*) &_bool_mirror); 177 f->do_oop((oop*) &_char_mirror); 178 f->do_oop((oop*) &_long_mirror); 179 f->do_oop((oop*) &_short_mirror); 180 f->do_oop((oop*) &_void_mirror); 181 182 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 183 f->do_oop((oop*) &_mirrors[i]); 184 } 185 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 186 187 f->do_oop((oop*)&_the_empty_class_klass_array); 188 f->do_oop((oop*)&_the_null_string); 189 f->do_oop((oop*)&_the_min_jint_string); 190 f->do_oop((oop*)&_out_of_memory_error_java_heap); 191 f->do_oop((oop*)&_out_of_memory_error_metaspace); 192 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 193 f->do_oop((oop*)&_out_of_memory_error_array_size); 194 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 195 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 196 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 197 f->do_oop((oop*)&_null_ptr_exception_instance); 198 f->do_oop((oop*)&_arithmetic_exception_instance); 199 f->do_oop((oop*)&_virtual_machine_error_instance); 200 f->do_oop((oop*)&_main_thread_group); 201 f->do_oop((oop*)&_system_thread_group); 202 f->do_oop((oop*)&_vm_exception); 203 f->do_oop((oop*)&_allocation_context_notification_obj); 204 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 205 } 206 207 // Serialize metadata in and out of CDS archive, not oops. 208 void Universe::serialize(SerializeClosure* f, bool do_all) { 209 210 f->do_ptr((void**)&_boolArrayKlassObj); 211 f->do_ptr((void**)&_byteArrayKlassObj); 212 f->do_ptr((void**)&_charArrayKlassObj); 213 f->do_ptr((void**)&_intArrayKlassObj); 214 f->do_ptr((void**)&_shortArrayKlassObj); 215 f->do_ptr((void**)&_longArrayKlassObj); 216 f->do_ptr((void**)&_singleArrayKlassObj); 217 f->do_ptr((void**)&_doubleArrayKlassObj); 218 f->do_ptr((void**)&_objectArrayKlassObj); 219 220 { 221 for (int i = 0; i < T_VOID+1; i++) { 222 if (_typeArrayKlassObjs[i] != NULL) { 223 assert(i >= T_BOOLEAN, "checking"); 224 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 225 } else if (do_all) { 226 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 227 } 228 } 229 } 230 231 f->do_ptr((void**)&_the_array_interfaces_array); 232 f->do_ptr((void**)&_the_empty_int_array); 233 f->do_ptr((void**)&_the_empty_short_array); 234 f->do_ptr((void**)&_the_empty_method_array); 235 f->do_ptr((void**)&_the_empty_klass_array); 236 _finalizer_register_cache->serialize(f); 237 _loader_addClass_cache->serialize(f); 238 _pd_implies_cache->serialize(f); 239 _throw_illegal_access_error_cache->serialize(f); 240 } 241 242 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 243 if (size < alignment || size % alignment != 0) { 244 vm_exit_during_initialization( 245 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 246 } 247 } 248 249 void initialize_basic_type_klass(Klass* k, TRAPS) { 250 Klass* ok = SystemDictionary::Object_klass(); 251 if (UseSharedSpaces) { 252 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 253 assert(k->super() == ok, "u3"); 254 k->restore_unshareable_info(loader_data, Handle(), CHECK); 255 } else { 256 k->initialize_supers(ok, CHECK); 257 } 258 k->append_to_sibling_list(); 259 } 260 261 void Universe::genesis(TRAPS) { 262 ResourceMark rm; 263 264 { FlagSetting fs(_bootstrapping, true); 265 266 { MutexLocker mc(Compile_lock); 267 268 // determine base vtable size; without that we cannot create the array klasses 269 compute_base_vtable_size(); 270 271 if (!UseSharedSpaces) { 272 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 273 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 274 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 275 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 276 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 277 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 278 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 279 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 280 281 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 282 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 283 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 284 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 285 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 286 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 287 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 288 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 289 290 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 291 292 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 293 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 294 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 295 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 296 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 297 } 298 } 299 300 vmSymbols::initialize(CHECK); 301 302 SystemDictionary::initialize(CHECK); 303 304 Klass* ok = SystemDictionary::Object_klass(); 305 306 _the_null_string = StringTable::intern("null", CHECK); 307 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 308 309 if (UseSharedSpaces) { 310 // Verify shared interfaces array. 311 assert(_the_array_interfaces_array->at(0) == 312 SystemDictionary::Cloneable_klass(), "u3"); 313 assert(_the_array_interfaces_array->at(1) == 314 SystemDictionary::Serializable_klass(), "u3"); 315 } else { 316 // Set up shared interfaces array. (Do this before supers are set up.) 317 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 318 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 319 } 320 321 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 322 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 323 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 324 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 325 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 326 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 327 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 328 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 329 } // end of core bootstrapping 330 331 // Maybe this could be lifted up now that object array can be initialized 332 // during the bootstrapping. 333 334 // OLD 335 // Initialize _objectArrayKlass after core bootstraping to make 336 // sure the super class is set up properly for _objectArrayKlass. 337 // --- 338 // NEW 339 // Since some of the old system object arrays have been converted to 340 // ordinary object arrays, _objectArrayKlass will be loaded when 341 // SystemDictionary::initialize(CHECK); is run. See the extra check 342 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 343 _objectArrayKlassObj = InstanceKlass:: 344 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 345 // OLD 346 // Add the class to the class hierarchy manually to make sure that 347 // its vtable is initialized after core bootstrapping is completed. 348 // --- 349 // New 350 // Have already been initialized. 351 _objectArrayKlassObj->append_to_sibling_list(); 352 353 // Compute is_jdk version flags. 354 // Only 1.3 or later has the java.lang.Shutdown class. 355 // Only 1.4 or later has the java.lang.CharSequence interface. 356 // Only 1.5 or later has the java.lang.management.MemoryUsage class. 357 if (JDK_Version::is_partially_initialized()) { 358 uint8_t jdk_version; 359 Klass* k = SystemDictionary::resolve_or_null( 360 vmSymbols::java_lang_management_MemoryUsage(), THREAD); 361 CLEAR_PENDING_EXCEPTION; // ignore exceptions 362 if (k == NULL) { 363 k = SystemDictionary::resolve_or_null( 364 vmSymbols::java_lang_CharSequence(), THREAD); 365 CLEAR_PENDING_EXCEPTION; // ignore exceptions 366 if (k == NULL) { 367 k = SystemDictionary::resolve_or_null( 368 vmSymbols::java_lang_Shutdown(), THREAD); 369 CLEAR_PENDING_EXCEPTION; // ignore exceptions 370 if (k == NULL) { 371 jdk_version = 2; 372 } else { 373 jdk_version = 3; 374 } 375 } else { 376 jdk_version = 4; 377 } 378 } else { 379 jdk_version = 5; 380 } 381 JDK_Version::fully_initialize(jdk_version); 382 } 383 384 #ifdef ASSERT 385 if (FullGCALot) { 386 // Allocate an array of dummy objects. 387 // We'd like these to be at the bottom of the old generation, 388 // so that when we free one and then collect, 389 // (almost) the whole heap moves 390 // and we find out if we actually update all the oops correctly. 391 // But we can't allocate directly in the old generation, 392 // so we allocate wherever, and hope that the first collection 393 // moves these objects to the bottom of the old generation. 394 // We can allocate directly in the permanent generation, so we do. 395 int size; 396 if (UseConcMarkSweepGC) { 397 warning("Using +FullGCALot with concurrent mark sweep gc " 398 "will not force all objects to relocate"); 399 size = FullGCALotDummies; 400 } else { 401 size = FullGCALotDummies * 2; 402 } 403 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 404 objArrayHandle dummy_array(THREAD, naked_array); 405 int i = 0; 406 while (i < size) { 407 // Allocate dummy in old generation 408 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); 409 dummy_array->obj_at_put(i++, dummy); 410 } 411 { 412 // Only modify the global variable inside the mutex. 413 // If we had a race to here, the other dummy_array instances 414 // and their elements just get dropped on the floor, which is fine. 415 MutexLocker ml(FullGCALot_lock); 416 if (_fullgc_alot_dummy_array == NULL) { 417 _fullgc_alot_dummy_array = dummy_array(); 418 } 419 } 420 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 421 } 422 #endif 423 424 // Initialize dependency array for null class loader 425 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 426 427 } 428 429 // CDS support for patching vtables in metadata in the shared archive. 430 // All types inherited from Metadata have vtables, but not types inherited 431 // from MetaspaceObj, because the latter does not have virtual functions. 432 // If the metadata type has a vtable, it cannot be shared in the read-only 433 // section of the CDS archive, because the vtable pointer is patched. 434 static inline void add_vtable(void** list, int* n, void* o, int count) { 435 guarantee((*n) < count, "vtable list too small"); 436 void* vtable = dereference_vptr(o); 437 assert(*(void**)(vtable) != NULL, "invalid vtable"); 438 list[(*n)++] = vtable; 439 } 440 441 void Universe::init_self_patching_vtbl_list(void** list, int count) { 442 int n = 0; 443 { InstanceKlass o; add_vtable(list, &n, &o, count); } 444 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 445 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 446 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 447 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 448 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 449 { Method o; add_vtable(list, &n, &o, count); } 450 { ConstantPool o; add_vtable(list, &n, &o, count); } 451 } 452 453 void Universe::initialize_basic_type_mirrors(TRAPS) { 454 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 455 _int_mirror = 456 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 457 _float_mirror = 458 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 459 _double_mirror = 460 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 461 _byte_mirror = 462 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 463 _bool_mirror = 464 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 465 _char_mirror = 466 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 467 _long_mirror = 468 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 469 _short_mirror = 470 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 471 _void_mirror = 472 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 473 474 _mirrors[T_INT] = _int_mirror; 475 _mirrors[T_FLOAT] = _float_mirror; 476 _mirrors[T_DOUBLE] = _double_mirror; 477 _mirrors[T_BYTE] = _byte_mirror; 478 _mirrors[T_BOOLEAN] = _bool_mirror; 479 _mirrors[T_CHAR] = _char_mirror; 480 _mirrors[T_LONG] = _long_mirror; 481 _mirrors[T_SHORT] = _short_mirror; 482 _mirrors[T_VOID] = _void_mirror; 483 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); 484 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); 485 } 486 487 void Universe::fixup_mirrors(TRAPS) { 488 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 489 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 490 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 491 // that the number of objects allocated at this point is very small. 492 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 493 HandleMark hm(THREAD); 494 // Cache the start of the static fields 495 InstanceMirrorKlass::init_offset_of_static_fields(); 496 497 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 498 int list_length = list->length(); 499 for (int i = 0; i < list_length; i++) { 500 Klass* k = list->at(i); 501 assert(k->is_klass(), "List should only hold classes"); 502 EXCEPTION_MARK; 503 KlassHandle kh(THREAD, k); 504 java_lang_Class::fixup_mirror(kh, CATCH); 505 } 506 delete java_lang_Class::fixup_mirror_list(); 507 java_lang_Class::set_fixup_mirror_list(NULL); 508 } 509 510 static bool has_run_finalizers_on_exit = false; 511 512 void Universe::run_finalizers_on_exit() { 513 if (has_run_finalizers_on_exit) return; 514 has_run_finalizers_on_exit = true; 515 516 // Called on VM exit. This ought to be run in a separate thread. 517 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 518 { 519 PRESERVE_EXCEPTION_MARK; 520 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 521 JavaValue result(T_VOID); 522 JavaCalls::call_static( 523 &result, 524 finalizer_klass, 525 vmSymbols::run_finalizers_on_exit_name(), 526 vmSymbols::void_method_signature(), 527 THREAD 528 ); 529 // Ignore any pending exceptions 530 CLEAR_PENDING_EXCEPTION; 531 } 532 } 533 534 535 // initialize_vtable could cause gc if 536 // 1) we specified true to initialize_vtable and 537 // 2) this ran after gc was enabled 538 // In case those ever change we use handles for oops 539 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 540 // init vtable of k and all subclasses 541 Klass* ko = k_h(); 542 klassVtable* vt = ko->vtable(); 543 if (vt) vt->initialize_vtable(false, CHECK); 544 if (ko->oop_is_instance()) { 545 InstanceKlass* ik = (InstanceKlass*)ko; 546 for (KlassHandle s_h(THREAD, ik->subklass()); 547 s_h() != NULL; 548 s_h = KlassHandle(THREAD, s_h()->next_sibling())) { 549 reinitialize_vtable_of(s_h, CHECK); 550 } 551 } 552 } 553 554 555 void initialize_itable_for_klass(Klass* k, TRAPS) { 556 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 557 } 558 559 560 void Universe::reinitialize_itables(TRAPS) { 561 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 562 563 } 564 565 566 bool Universe::on_page_boundary(void* addr) { 567 return ((uintptr_t) addr) % os::vm_page_size() == 0; 568 } 569 570 571 bool Universe::should_fill_in_stack_trace(Handle throwable) { 572 // never attempt to fill in the stack trace of preallocated errors that do not have 573 // backtrace. These errors are kept alive forever and may be "re-used" when all 574 // preallocated errors with backtrace have been consumed. Also need to avoid 575 // a potential loop which could happen if an out of memory occurs when attempting 576 // to allocate the backtrace. 577 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 578 (throwable() != Universe::_out_of_memory_error_metaspace) && 579 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 580 (throwable() != Universe::_out_of_memory_error_array_size) && 581 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) && 582 (throwable() != Universe::_out_of_memory_error_realloc_objects)); 583 } 584 585 586 oop Universe::gen_out_of_memory_error(oop default_err) { 587 // generate an out of memory error: 588 // - if there is a preallocated error with backtrace available then return it wth 589 // a filled in stack trace. 590 // - if there are no preallocated errors with backtrace available then return 591 // an error without backtrace. 592 int next; 593 if (_preallocated_out_of_memory_error_avail_count > 0) { 594 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 595 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 596 } else { 597 next = -1; 598 } 599 if (next < 0) { 600 // all preallocated errors have been used. 601 // return default 602 return default_err; 603 } else { 604 // get the error object at the slot and set set it to NULL so that the 605 // array isn't keeping it alive anymore. 606 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 607 assert(exc != NULL, "slot has been used already"); 608 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 609 610 // use the message from the default error 611 oop msg = java_lang_Throwable::message(default_err); 612 assert(msg != NULL, "no message"); 613 java_lang_Throwable::set_message(exc, msg); 614 615 // populate the stack trace and return it. 616 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 617 return exc; 618 } 619 } 620 621 intptr_t Universe::_non_oop_bits = 0; 622 623 void* Universe::non_oop_word() { 624 // Neither the high bits nor the low bits of this value is allowed 625 // to look like (respectively) the high or low bits of a real oop. 626 // 627 // High and low are CPU-specific notions, but low always includes 628 // the low-order bit. Since oops are always aligned at least mod 4, 629 // setting the low-order bit will ensure that the low half of the 630 // word will never look like that of a real oop. 631 // 632 // Using the OS-supplied non-memory-address word (usually 0 or -1) 633 // will take care of the high bits, however many there are. 634 635 if (_non_oop_bits == 0) { 636 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 637 } 638 639 return (void*)_non_oop_bits; 640 } 641 642 jint universe_init() { 643 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 644 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 645 "LogHeapWordSize is incorrect."); 646 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 647 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 648 "oop size is not not a multiple of HeapWord size"); 649 TraceTime timer("Genesis", TraceStartupTime); 650 JavaClasses::compute_hard_coded_offsets(); 651 652 jint status = Universe::initialize_heap(); 653 if (status != JNI_OK) { 654 return status; 655 } 656 657 Metaspace::global_initialize(); 658 659 // Create memory for metadata. Must be after initializing heap for 660 // DumpSharedSpaces. 661 ClassLoaderData::init_null_class_loader_data(); 662 663 // We have a heap so create the Method* caches before 664 // Metaspace::initialize_shared_spaces() tries to populate them. 665 Universe::_finalizer_register_cache = new LatestMethodCache(); 666 Universe::_loader_addClass_cache = new LatestMethodCache(); 667 Universe::_pd_implies_cache = new LatestMethodCache(); 668 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 669 670 if (UseSharedSpaces) { 671 // Read the data structures supporting the shared spaces (shared 672 // system dictionary, symbol table, etc.). After that, access to 673 // the file (other than the mapped regions) is no longer needed, and 674 // the file is closed. Closing the file does not affect the 675 // currently mapped regions. 676 MetaspaceShared::initialize_shared_spaces(); 677 StringTable::create_table(); 678 } else { 679 SymbolTable::create_table(); 680 StringTable::create_table(); 681 ClassLoader::create_package_info_table(); 682 683 if (DumpSharedSpaces) { 684 MetaspaceShared::prepare_for_dumping(); 685 } 686 } 687 688 return JNI_OK; 689 } 690 691 // Choose the heap base address and oop encoding mode 692 // when compressed oops are used: 693 // Unscaled - Use 32-bits oops without encoding when 694 // NarrowOopHeapBaseMin + heap_size < 4Gb 695 // ZeroBased - Use zero based compressed oops with encoding when 696 // NarrowOopHeapBaseMin + heap_size < 32Gb 697 // HeapBased - Use compressed oops with heap base + encoding. 698 699 // 4Gb 700 static const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1); 701 // 32Gb 702 // OopEncodingHeapMax == UnscaledOopHeapMax << LogMinObjAlignmentInBytes; 703 704 char* Universe::preferred_heap_base(size_t heap_size, size_t alignment, NARROW_OOP_MODE mode) { 705 assert(is_size_aligned((size_t)OopEncodingHeapMax, alignment), "Must be"); 706 assert(is_size_aligned((size_t)UnscaledOopHeapMax, alignment), "Must be"); 707 assert(is_size_aligned(heap_size, alignment), "Must be"); 708 709 uintx heap_base_min_address_aligned = align_size_up(HeapBaseMinAddress, alignment); 710 711 size_t base = 0; 712 #ifdef _LP64 713 if (UseCompressedOops) { 714 assert(mode == UnscaledNarrowOop || 715 mode == ZeroBasedNarrowOop || 716 mode == HeapBasedNarrowOop, "mode is invalid"); 717 const size_t total_size = heap_size + heap_base_min_address_aligned; 718 // Return specified base for the first request. 719 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { 720 base = heap_base_min_address_aligned; 721 722 // If the total size is small enough to allow UnscaledNarrowOop then 723 // just use UnscaledNarrowOop. 724 } else if ((total_size <= OopEncodingHeapMax) && (mode != HeapBasedNarrowOop)) { 725 if ((total_size <= UnscaledOopHeapMax) && (mode == UnscaledNarrowOop) && 726 (Universe::narrow_oop_shift() == 0)) { 727 // Use 32-bits oops without encoding and 728 // place heap's top on the 4Gb boundary 729 base = (UnscaledOopHeapMax - heap_size); 730 } else { 731 // Can't reserve with NarrowOopShift == 0 732 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 733 734 if (mode == UnscaledNarrowOop || 735 mode == ZeroBasedNarrowOop && total_size <= UnscaledOopHeapMax) { 736 737 // Use zero based compressed oops with encoding and 738 // place heap's top on the 32Gb boundary in case 739 // total_size > 4Gb or failed to reserve below 4Gb. 740 uint64_t heap_top = OopEncodingHeapMax; 741 742 // For small heaps, save some space for compressed class pointer 743 // space so it can be decoded with no base. 744 if (UseCompressedClassPointers && !UseSharedSpaces && 745 OopEncodingHeapMax <= 32*G) { 746 747 uint64_t class_space = align_size_up(CompressedClassSpaceSize, alignment); 748 assert(is_size_aligned((size_t)OopEncodingHeapMax-class_space, 749 alignment), "difference must be aligned too"); 750 uint64_t new_top = OopEncodingHeapMax-class_space; 751 752 if (total_size <= new_top) { 753 heap_top = new_top; 754 } 755 } 756 757 // Align base to the adjusted top of the heap 758 base = heap_top - heap_size; 759 } 760 } 761 } else { 762 // UnscaledNarrowOop encoding didn't work, and no base was found for ZeroBasedOops or 763 // HeapBasedNarrowOop encoding was requested. So, can't reserve below 32Gb. 764 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 765 } 766 767 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks 768 // used in ReservedHeapSpace() constructors. 769 // The final values will be set in initialize_heap() below. 770 if ((base != 0) && ((base + heap_size) <= OopEncodingHeapMax)) { 771 // Use zero based compressed oops 772 Universe::set_narrow_oop_base(NULL); 773 // Don't need guard page for implicit checks in indexed 774 // addressing mode with zero based Compressed Oops. 775 Universe::set_narrow_oop_use_implicit_null_checks(true); 776 } else { 777 // Set to a non-NULL value so the ReservedSpace ctor computes 778 // the correct no-access prefix. 779 // The final value will be set in initialize_heap() below. 780 Universe::set_narrow_oop_base((address)UnscaledOopHeapMax); 781 #if defined(_WIN64) || defined(AIX) 782 if (UseLargePages) { 783 // Cannot allocate guard pages for implicit checks in indexed 784 // addressing mode when large pages are specified on windows. 785 Universe::set_narrow_oop_use_implicit_null_checks(false); 786 } 787 #endif // _WIN64 788 } 789 } 790 #endif 791 792 assert(is_ptr_aligned((char*)base, alignment), "Must be"); 793 return (char*)base; // also return NULL (don't care) for 32-bit VM 794 } 795 796 jint Universe::initialize_heap() { 797 798 if (UseParallelGC) { 799 #if INCLUDE_ALL_GCS 800 Universe::_collectedHeap = new ParallelScavengeHeap(); 801 #else // INCLUDE_ALL_GCS 802 fatal("UseParallelGC not supported in this VM."); 803 #endif // INCLUDE_ALL_GCS 804 805 } else if (UseG1GC) { 806 #if INCLUDE_ALL_GCS 807 G1CollectorPolicyExt* g1p = new G1CollectorPolicyExt(); 808 g1p->initialize_all(); 809 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); 810 Universe::_collectedHeap = g1h; 811 #else // INCLUDE_ALL_GCS 812 fatal("UseG1GC not supported in java kernel vm."); 813 #endif // INCLUDE_ALL_GCS 814 815 } else { 816 GenCollectorPolicy *gc_policy; 817 818 if (UseSerialGC) { 819 gc_policy = new MarkSweepPolicy(); 820 } else if (UseConcMarkSweepGC) { 821 #if INCLUDE_ALL_GCS 822 gc_policy = new ConcurrentMarkSweepPolicy(); 823 #else // INCLUDE_ALL_GCS 824 fatal("UseConcMarkSweepGC not supported in this VM."); 825 #endif // INCLUDE_ALL_GCS 826 } else { // default old generation 827 gc_policy = new MarkSweepPolicy(); 828 } 829 gc_policy->initialize_all(); 830 831 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); 832 } 833 834 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 835 836 jint status = Universe::heap()->initialize(); 837 if (status != JNI_OK) { 838 return status; 839 } 840 841 #ifdef _LP64 842 if (UseCompressedOops) { 843 // Subtract a page because something can get allocated at heap base. 844 // This also makes implicit null checking work, because the 845 // memory+1 page below heap_base needs to cause a signal. 846 // See needs_explicit_null_check. 847 // Only set the heap base for compressed oops because it indicates 848 // compressed oops for pstack code. 849 if (((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax)) { 850 // Can't reserve heap below 32Gb. 851 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap() 852 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 853 #ifdef AIX 854 // There is no protected page before the heap. This assures all oops 855 // are decoded so that NULL is preserved, so this page will not be accessed. 856 Universe::set_narrow_oop_use_implicit_null_checks(false); 857 #endif 858 } else { 859 Universe::set_narrow_oop_base(0); 860 #ifdef _WIN64 861 if (!Universe::narrow_oop_use_implicit_null_checks()) { 862 // Don't need guard page for implicit checks in indexed addressing 863 // mode with zero based Compressed Oops. 864 Universe::set_narrow_oop_use_implicit_null_checks(true); 865 } 866 #endif // _WIN64 867 if((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 868 // Can't reserve heap below 4Gb. 869 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 870 } else { 871 Universe::set_narrow_oop_shift(0); 872 } 873 } 874 875 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 876 877 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 878 Universe::print_compressed_oops_mode(); 879 } 880 } 881 // Universe::narrow_oop_base() is one page below the heap. 882 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 883 os::vm_page_size()) || 884 Universe::narrow_oop_base() == NULL, "invalid value"); 885 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 886 Universe::narrow_oop_shift() == 0, "invalid value"); 887 #endif 888 889 // We will never reach the CATCH below since Exceptions::_throw will cause 890 // the VM to exit if an exception is thrown during initialization 891 892 if (UseTLAB) { 893 assert(Universe::heap()->supports_tlab_allocation(), 894 "Should support thread-local allocation buffers"); 895 ThreadLocalAllocBuffer::startup_initialization(); 896 } 897 return JNI_OK; 898 } 899 900 void Universe::print_compressed_oops_mode() { 901 tty->cr(); 902 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 903 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); 904 905 tty->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 906 907 if (Universe::narrow_oop_base() != 0) { 908 tty->print(":" PTR_FORMAT, Universe::narrow_oop_base()); 909 } 910 911 if (Universe::narrow_oop_shift() != 0) { 912 tty->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 913 } 914 915 tty->cr(); 916 tty->cr(); 917 } 918 919 // Reserve the Java heap, which is now the same for all GCs. 920 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 921 assert(alignment <= Arguments::conservative_max_heap_alignment(), 922 err_msg("actual alignment "SIZE_FORMAT" must be within maximum heap alignment "SIZE_FORMAT, 923 alignment, Arguments::conservative_max_heap_alignment())); 924 size_t total_reserved = align_size_up(heap_size, alignment); 925 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 926 "heap size is too big for compressed oops"); 927 928 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size()); 929 assert(!UseLargePages 930 || UseParallelGC 931 || use_large_pages, "Wrong alignment to use large pages"); 932 933 char* addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::UnscaledNarrowOop); 934 935 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, addr); 936 937 if (UseCompressedOops) { 938 if (addr != NULL && !total_rs.is_reserved()) { 939 // Failed to reserve at specified address - the requested memory 940 // region is taken already, for example, by 'java' launcher. 941 // Try again to reserver heap higher. 942 addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::ZeroBasedNarrowOop); 943 944 ReservedHeapSpace total_rs0(total_reserved, alignment, 945 use_large_pages, addr); 946 947 if (addr != NULL && !total_rs0.is_reserved()) { 948 // Failed to reserve at specified address again - give up. 949 addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::HeapBasedNarrowOop); 950 assert(addr == NULL, ""); 951 952 ReservedHeapSpace total_rs1(total_reserved, alignment, 953 use_large_pages, addr); 954 total_rs = total_rs1; 955 } else { 956 total_rs = total_rs0; 957 } 958 } 959 } 960 961 if (!total_rs.is_reserved()) { 962 vm_exit_during_initialization(err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", total_reserved/K)); 963 return total_rs; 964 } 965 966 if (UseCompressedOops) { 967 // Universe::initialize_heap() will reset this to NULL if unscaled 968 // or zero-based narrow oops are actually used. 969 address base = (address)(total_rs.base() - os::vm_page_size()); 970 Universe::set_narrow_oop_base(base); 971 } 972 return total_rs; 973 } 974 975 976 // It's the caller's responsibility to ensure glitch-freedom 977 // (if required). 978 void Universe::update_heap_info_at_gc() { 979 _heap_capacity_at_last_gc = heap()->capacity(); 980 _heap_used_at_last_gc = heap()->used(); 981 } 982 983 984 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 985 switch (mode) { 986 case UnscaledNarrowOop: 987 return "32-bit"; 988 case ZeroBasedNarrowOop: 989 return "Zero based"; 990 case HeapBasedNarrowOop: 991 return "Non-zero based"; 992 } 993 994 ShouldNotReachHere(); 995 return ""; 996 } 997 998 999 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 1000 if (narrow_oop_base() != 0) { 1001 return HeapBasedNarrowOop; 1002 } 1003 1004 if (narrow_oop_shift() != 0) { 1005 return ZeroBasedNarrowOop; 1006 } 1007 1008 return UnscaledNarrowOop; 1009 } 1010 1011 1012 void universe2_init() { 1013 EXCEPTION_MARK; 1014 Universe::genesis(CATCH); 1015 } 1016 1017 1018 bool universe_post_init() { 1019 assert(!is_init_completed(), "Error: initialization not yet completed!"); 1020 Universe::_fully_initialized = true; 1021 EXCEPTION_MARK; 1022 { ResourceMark rm; 1023 Interpreter::initialize(); // needed for interpreter entry points 1024 if (!UseSharedSpaces) { 1025 HandleMark hm(THREAD); 1026 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 1027 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 1028 Universe::reinitialize_itables(CHECK_false); 1029 } 1030 } 1031 1032 HandleMark hm(THREAD); 1033 Klass* k; 1034 instanceKlassHandle k_h; 1035 // Setup preallocated empty java.lang.Class array 1036 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 1037 1038 // Setup preallocated OutOfMemoryError errors 1039 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 1040 k_h = instanceKlassHandle(THREAD, k); 1041 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 1042 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); 1043 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); 1044 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 1045 Universe::_out_of_memory_error_gc_overhead_limit = 1046 k_h->allocate_instance(CHECK_false); 1047 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false); 1048 1049 // Setup preallocated NullPointerException 1050 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1051 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1052 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1053 // Setup preallocated ArithmeticException 1054 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1055 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1056 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1057 // Virtual Machine Error for when we get into a situation we can't resolve 1058 k = SystemDictionary::resolve_or_fail( 1059 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1060 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1061 if (!linked) { 1062 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1063 return false; // initialization failed 1064 } 1065 Universe::_virtual_machine_error_instance = 1066 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1067 1068 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1069 1070 if (!DumpSharedSpaces) { 1071 // These are the only Java fields that are currently set during shared space dumping. 1072 // We prefer to not handle this generally, so we always reinitialize these detail messages. 1073 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1074 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1075 1076 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 1077 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1078 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 1079 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1080 1081 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1082 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1083 1084 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1085 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1086 1087 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 1088 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 1089 1090 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1091 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1092 1093 // Setup the array of errors that have preallocated backtrace 1094 k = Universe::_out_of_memory_error_java_heap->klass(); 1095 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1096 k_h = instanceKlassHandle(THREAD, k); 1097 1098 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1099 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 1100 for (int i=0; i<len; i++) { 1101 oop err = k_h->allocate_instance(CHECK_false); 1102 Handle err_h = Handle(THREAD, err); 1103 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1104 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1105 } 1106 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1107 } 1108 1109 1110 // Setup static method for registering finalizers 1111 // The finalizer klass must be linked before looking up the method, in 1112 // case it needs to get rewritten. 1113 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); 1114 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( 1115 vmSymbols::register_method_name(), 1116 vmSymbols::register_method_signature()); 1117 if (m == NULL || !m->is_static()) { 1118 tty->print_cr("Unable to link/verify Finalizer.register method"); 1119 return false; // initialization failed (cannot throw exception yet) 1120 } 1121 Universe::_finalizer_register_cache->init( 1122 SystemDictionary::Finalizer_klass(), m); 1123 1124 InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->link_class(CHECK_false); 1125 m = InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->find_method( 1126 vmSymbols::throwIllegalAccessError_name(), 1127 vmSymbols::void_method_signature()); 1128 if (m != NULL && !m->is_static()) { 1129 // Note null is okay; this method is used in itables, and if it is null, 1130 // then AbstractMethodError is thrown instead. 1131 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method"); 1132 return false; // initialization failed (cannot throw exception yet) 1133 } 1134 Universe::_throw_illegal_access_error_cache->init( 1135 SystemDictionary::misc_Unsafe_klass(), m); 1136 1137 // Setup method for registering loaded classes in class loader vector 1138 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); 1139 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1140 if (m == NULL || m->is_static()) { 1141 tty->print_cr("Unable to link/verify ClassLoader.addClass method"); 1142 return false; // initialization failed (cannot throw exception yet) 1143 } 1144 Universe::_loader_addClass_cache->init( 1145 SystemDictionary::ClassLoader_klass(), m); 1146 1147 // Setup method for checking protection domain 1148 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false); 1149 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())-> 1150 find_method(vmSymbols::impliesCreateAccessControlContext_name(), 1151 vmSymbols::void_boolean_signature()); 1152 // Allow NULL which should only happen with bootstrapping. 1153 if (m != NULL) { 1154 if (m->is_static()) { 1155 // NoSuchMethodException doesn't actually work because it tries to run the 1156 // <init> function before java_lang_Class is linked. Print error and exit. 1157 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); 1158 return false; // initialization failed 1159 } 1160 Universe::_pd_implies_cache->init( 1161 SystemDictionary::ProtectionDomain_klass(), m); 1162 } 1163 1164 // This needs to be done before the first scavenge/gc, since 1165 // it's an input to soft ref clearing policy. 1166 { 1167 MutexLocker x(Heap_lock); 1168 Universe::update_heap_info_at_gc(); 1169 } 1170 1171 // ("weak") refs processing infrastructure initialization 1172 Universe::heap()->post_initialize(); 1173 1174 // Initialize performance counters for metaspaces 1175 MetaspaceCounters::initialize_performance_counters(); 1176 CompressedClassSpaceCounters::initialize_performance_counters(); 1177 1178 MemoryService::add_metaspace_memory_pools(); 1179 1180 MemoryService::set_universe_heap(Universe::_collectedHeap); 1181 #if INCLUDE_CDS 1182 SharedClassUtil::initialize(CHECK_false); 1183 #endif 1184 return true; 1185 } 1186 1187 1188 void Universe::compute_base_vtable_size() { 1189 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1190 } 1191 1192 1193 // %%% The Universe::flush_foo methods belong in CodeCache. 1194 1195 // Flushes compiled methods dependent on dependee. 1196 void Universe::flush_dependents_on(instanceKlassHandle dependee) { 1197 assert_lock_strong(Compile_lock); 1198 1199 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1200 1201 // CodeCache can only be updated by a thread_in_VM and they will all be 1202 // stopped during the safepoint so CodeCache will be safe to update without 1203 // holding the CodeCache_lock. 1204 1205 KlassDepChange changes(dependee); 1206 1207 // Compute the dependent nmethods 1208 if (CodeCache::mark_for_deoptimization(changes) > 0) { 1209 // At least one nmethod has been marked for deoptimization 1210 VM_Deoptimize op; 1211 VMThread::execute(&op); 1212 } 1213 } 1214 1215 // Flushes compiled methods dependent on a particular CallSite 1216 // instance when its target is different than the given MethodHandle. 1217 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) { 1218 assert_lock_strong(Compile_lock); 1219 1220 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1221 1222 // CodeCache can only be updated by a thread_in_VM and they will all be 1223 // stopped during the safepoint so CodeCache will be safe to update without 1224 // holding the CodeCache_lock. 1225 1226 CallSiteDepChange changes(call_site(), method_handle()); 1227 1228 // Compute the dependent nmethods that have a reference to a 1229 // CallSite object. We use InstanceKlass::mark_dependent_nmethod 1230 // directly instead of CodeCache::mark_for_deoptimization because we 1231 // want dependents on the call site class only not all classes in 1232 // the ContextStream. 1233 int marked = 0; 1234 { 1235 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1236 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass()); 1237 marked = call_site_klass->mark_dependent_nmethods(changes); 1238 } 1239 if (marked > 0) { 1240 // At least one nmethod has been marked for deoptimization 1241 VM_Deoptimize op; 1242 VMThread::execute(&op); 1243 } 1244 } 1245 1246 #ifdef HOTSWAP 1247 // Flushes compiled methods dependent on dependee in the evolutionary sense 1248 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { 1249 // --- Compile_lock is not held. However we are at a safepoint. 1250 assert_locked_or_safepoint(Compile_lock); 1251 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1252 1253 // CodeCache can only be updated by a thread_in_VM and they will all be 1254 // stopped during the safepoint so CodeCache will be safe to update without 1255 // holding the CodeCache_lock. 1256 1257 // Compute the dependent nmethods 1258 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { 1259 // At least one nmethod has been marked for deoptimization 1260 1261 // All this already happens inside a VM_Operation, so we'll do all the work here. 1262 // Stuff copied from VM_Deoptimize and modified slightly. 1263 1264 // We do not want any GCs to happen while we are in the middle of this VM operation 1265 ResourceMark rm; 1266 DeoptimizationMarker dm; 1267 1268 // Deoptimize all activations depending on marked nmethods 1269 Deoptimization::deoptimize_dependents(); 1270 1271 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1272 CodeCache::make_marked_nmethods_not_entrant(); 1273 } 1274 } 1275 #endif // HOTSWAP 1276 1277 1278 // Flushes compiled methods dependent on dependee 1279 void Universe::flush_dependents_on_method(methodHandle m_h) { 1280 // --- Compile_lock is not held. However we are at a safepoint. 1281 assert_locked_or_safepoint(Compile_lock); 1282 1283 // CodeCache can only be updated by a thread_in_VM and they will all be 1284 // stopped dring the safepoint so CodeCache will be safe to update without 1285 // holding the CodeCache_lock. 1286 1287 // Compute the dependent nmethods 1288 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { 1289 // At least one nmethod has been marked for deoptimization 1290 1291 // All this already happens inside a VM_Operation, so we'll do all the work here. 1292 // Stuff copied from VM_Deoptimize and modified slightly. 1293 1294 // We do not want any GCs to happen while we are in the middle of this VM operation 1295 ResourceMark rm; 1296 DeoptimizationMarker dm; 1297 1298 // Deoptimize all activations depending on marked nmethods 1299 Deoptimization::deoptimize_dependents(); 1300 1301 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1302 CodeCache::make_marked_nmethods_not_entrant(); 1303 } 1304 } 1305 1306 void Universe::print() { 1307 print_on(gclog_or_tty); 1308 } 1309 1310 void Universe::print_on(outputStream* st, bool extended) { 1311 st->print_cr("Heap"); 1312 if (!extended) { 1313 heap()->print_on(st); 1314 } else { 1315 heap()->print_extended_on(st); 1316 } 1317 } 1318 1319 void Universe::print_heap_at_SIGBREAK() { 1320 if (PrintHeapAtSIGBREAK) { 1321 MutexLocker hl(Heap_lock); 1322 print_on(tty); 1323 tty->cr(); 1324 tty->flush(); 1325 } 1326 } 1327 1328 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1329 st->print_cr("{Heap before GC invocations=%u (full %u):", 1330 heap()->total_collections(), 1331 heap()->total_full_collections()); 1332 if (!PrintHeapAtGCExtended || ignore_extended) { 1333 heap()->print_on(st); 1334 } else { 1335 heap()->print_extended_on(st); 1336 } 1337 } 1338 1339 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1340 st->print_cr("Heap after GC invocations=%u (full %u):", 1341 heap()->total_collections(), 1342 heap()->total_full_collections()); 1343 if (!PrintHeapAtGCExtended || ignore_extended) { 1344 heap()->print_on(st); 1345 } else { 1346 heap()->print_extended_on(st); 1347 } 1348 st->print_cr("}"); 1349 } 1350 1351 void Universe::verify(VerifyOption option, const char* prefix, bool silent) { 1352 // The use of _verify_in_progress is a temporary work around for 1353 // 6320749. Don't bother with a creating a class to set and clear 1354 // it since it is only used in this method and the control flow is 1355 // straight forward. 1356 _verify_in_progress = true; 1357 1358 COMPILER2_PRESENT( 1359 assert(!DerivedPointerTable::is_active(), 1360 "DPT should not be active during verification " 1361 "(of thread stacks below)"); 1362 ) 1363 1364 ResourceMark rm; 1365 HandleMark hm; // Handles created during verification can be zapped 1366 _verify_count++; 1367 1368 if (!silent) gclog_or_tty->print("%s", prefix); 1369 if (!silent) gclog_or_tty->print("[Verifying "); 1370 if (!silent) gclog_or_tty->print("threads "); 1371 Threads::verify(); 1372 if (!silent) gclog_or_tty->print("heap "); 1373 heap()->verify(silent, option); 1374 if (!silent) gclog_or_tty->print("syms "); 1375 SymbolTable::verify(); 1376 if (!silent) gclog_or_tty->print("strs "); 1377 StringTable::verify(); 1378 { 1379 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1380 if (!silent) gclog_or_tty->print("zone "); 1381 CodeCache::verify(); 1382 } 1383 if (!silent) gclog_or_tty->print("dict "); 1384 SystemDictionary::verify(); 1385 #ifndef PRODUCT 1386 if (!silent) gclog_or_tty->print("cldg "); 1387 ClassLoaderDataGraph::verify(); 1388 #endif 1389 if (!silent) gclog_or_tty->print("metaspace chunks "); 1390 MetaspaceAux::verify_free_chunks(); 1391 if (!silent) gclog_or_tty->print("hand "); 1392 JNIHandles::verify(); 1393 if (!silent) gclog_or_tty->print("C-heap "); 1394 os::check_heap(); 1395 if (!silent) gclog_or_tty->print("code cache "); 1396 CodeCache::verify_oops(); 1397 if (!silent) gclog_or_tty->print_cr("]"); 1398 1399 _verify_in_progress = false; 1400 } 1401 1402 // Oop verification (see MacroAssembler::verify_oop) 1403 1404 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; 1405 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; 1406 1407 1408 #ifndef PRODUCT 1409 1410 static void calculate_verify_data(uintptr_t verify_data[2], 1411 HeapWord* low_boundary, 1412 HeapWord* high_boundary) { 1413 assert(low_boundary < high_boundary, "bad interval"); 1414 1415 // decide which low-order bits we require to be clear: 1416 size_t alignSize = MinObjAlignmentInBytes; 1417 size_t min_object_size = CollectedHeap::min_fill_size(); 1418 1419 // make an inclusive limit: 1420 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1421 uintptr_t min = (uintptr_t)low_boundary; 1422 assert(min < max, "bad interval"); 1423 uintptr_t diff = max ^ min; 1424 1425 // throw away enough low-order bits to make the diff vanish 1426 uintptr_t mask = (uintptr_t)(-1); 1427 while ((mask & diff) != 0) 1428 mask <<= 1; 1429 uintptr_t bits = (min & mask); 1430 assert(bits == (max & mask), "correct mask"); 1431 // check an intermediate value between min and max, just to make sure: 1432 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1433 1434 // require address alignment, too: 1435 mask |= (alignSize - 1); 1436 1437 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { 1438 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); 1439 } 1440 verify_data[0] = mask; 1441 verify_data[1] = bits; 1442 } 1443 1444 // Oop verification (see MacroAssembler::verify_oop) 1445 1446 uintptr_t Universe::verify_oop_mask() { 1447 MemRegion m = heap()->reserved_region(); 1448 calculate_verify_data(_verify_oop_data, 1449 m.start(), 1450 m.end()); 1451 return _verify_oop_data[0]; 1452 } 1453 1454 1455 1456 uintptr_t Universe::verify_oop_bits() { 1457 verify_oop_mask(); 1458 return _verify_oop_data[1]; 1459 } 1460 1461 uintptr_t Universe::verify_mark_mask() { 1462 return markOopDesc::lock_mask_in_place; 1463 } 1464 1465 uintptr_t Universe::verify_mark_bits() { 1466 intptr_t mask = verify_mark_mask(); 1467 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1468 assert((bits & ~mask) == 0, "no stray header bits"); 1469 return bits; 1470 } 1471 #endif // PRODUCT 1472 1473 1474 void Universe::compute_verify_oop_data() { 1475 verify_oop_mask(); 1476 verify_oop_bits(); 1477 verify_mark_mask(); 1478 verify_mark_bits(); 1479 } 1480 1481 1482 void LatestMethodCache::init(Klass* k, Method* m) { 1483 if (!UseSharedSpaces) { 1484 _klass = k; 1485 } 1486 #ifndef PRODUCT 1487 else { 1488 // sharing initilization should have already set up _klass 1489 assert(_klass != NULL, "just checking"); 1490 } 1491 #endif 1492 1493 _method_idnum = m->method_idnum(); 1494 assert(_method_idnum >= 0, "sanity check"); 1495 } 1496 1497 1498 Method* LatestMethodCache::get_method() { 1499 if (klass() == NULL) return NULL; 1500 InstanceKlass* ik = InstanceKlass::cast(klass()); 1501 Method* m = ik->method_with_idnum(method_idnum()); 1502 assert(m != NULL, "sanity check"); 1503 return m; 1504 } 1505 1506 1507 #ifdef ASSERT 1508 // Release dummy object(s) at bottom of heap 1509 bool Universe::release_fullgc_alot_dummy() { 1510 MutexLocker ml(FullGCALot_lock); 1511 if (_fullgc_alot_dummy_array != NULL) { 1512 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1513 // No more dummies to release, release entire array instead 1514 _fullgc_alot_dummy_array = NULL; 1515 return false; 1516 } 1517 if (!UseConcMarkSweepGC) { 1518 // Release dummy at bottom of old generation 1519 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1520 } 1521 // Release dummy at bottom of permanent generation 1522 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1523 } 1524 return true; 1525 } 1526 1527 #endif // ASSERT