1 /* 2 * Copyright (c) 1997, 2016, 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 #if INCLUDE_CDS 30 #include "classfile/sharedClassUtil.hpp" 31 #endif 32 #include "classfile/symbolTable.hpp" 33 #include "classfile/systemDictionary.hpp" 34 #include "classfile/vmSymbols.hpp" 35 #include "code/codeCache.hpp" 36 #include "code/dependencies.hpp" 37 #include "gc_interface/collectedHeap.inline.hpp" 38 #include "interpreter/interpreter.hpp" 39 #include "memory/cardTableModRefBS.hpp" 40 #include "memory/filemap.hpp" 41 #include "memory/gcLocker.inline.hpp" 42 #include "memory/genCollectedHeap.hpp" 43 #include "memory/genRemSet.hpp" 44 #include "memory/generation.hpp" 45 #include "memory/metadataFactory.hpp" 46 #include "memory/metaspaceShared.hpp" 47 #include "memory/oopFactory.hpp" 48 #include "memory/space.hpp" 49 #include "memory/universe.hpp" 50 #include "memory/universe.inline.hpp" 51 #include "oops/constantPool.hpp" 52 #include "oops/instanceClassLoaderKlass.hpp" 53 #include "oops/instanceKlass.hpp" 54 #include "oops/instanceMirrorKlass.hpp" 55 #include "oops/instanceRefKlass.hpp" 56 #include "oops/oop.inline.hpp" 57 #include "oops/typeArrayKlass.hpp" 58 #include "prims/jvmtiRedefineClassesTrace.hpp" 59 #include "runtime/arguments.hpp" 60 #include "runtime/deoptimization.hpp" 61 #include "runtime/fprofiler.hpp" 62 #include "runtime/handles.inline.hpp" 63 #include "runtime/init.hpp" 64 #include "runtime/java.hpp" 65 #include "runtime/javaCalls.hpp" 66 #include "runtime/sharedRuntime.hpp" 67 #include "runtime/synchronizer.hpp" 68 #include "runtime/thread.inline.hpp" 69 #include "runtime/timer.hpp" 70 #include "runtime/vm_operations.hpp" 71 #include "services/memoryService.hpp" 72 #include "utilities/copy.hpp" 73 #include "utilities/events.hpp" 74 #include "utilities/hashtable.inline.hpp" 75 #include "utilities/preserveException.hpp" 76 #include "utilities/macros.hpp" 77 #if INCLUDE_ALL_GCS 78 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" 79 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp" 80 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 81 #include "gc_implementation/g1/g1CollectorPolicy_ext.hpp" 82 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 83 #endif // INCLUDE_ALL_GCS 84 85 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 86 87 // Known objects 88 Klass* Universe::_boolArrayKlassObj = NULL; 89 Klass* Universe::_byteArrayKlassObj = NULL; 90 Klass* Universe::_charArrayKlassObj = NULL; 91 Klass* Universe::_intArrayKlassObj = NULL; 92 Klass* Universe::_shortArrayKlassObj = NULL; 93 Klass* Universe::_longArrayKlassObj = NULL; 94 Klass* Universe::_singleArrayKlassObj = NULL; 95 Klass* Universe::_doubleArrayKlassObj = NULL; 96 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 97 Klass* Universe::_objectArrayKlassObj = NULL; 98 oop Universe::_int_mirror = NULL; 99 oop Universe::_float_mirror = NULL; 100 oop Universe::_double_mirror = NULL; 101 oop Universe::_byte_mirror = NULL; 102 oop Universe::_bool_mirror = NULL; 103 oop Universe::_char_mirror = NULL; 104 oop Universe::_long_mirror = NULL; 105 oop Universe::_short_mirror = NULL; 106 oop Universe::_void_mirror = NULL; 107 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 108 oop Universe::_main_thread_group = NULL; 109 oop Universe::_system_thread_group = NULL; 110 objArrayOop Universe::_the_empty_class_klass_array = NULL; 111 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 112 oop Universe::_the_null_string = NULL; 113 oop Universe::_the_min_jint_string = NULL; 114 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 115 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 116 LatestMethodCache* Universe::_pd_implies_cache = NULL; 117 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 118 oop Universe::_out_of_memory_error_java_heap = NULL; 119 oop Universe::_out_of_memory_error_metaspace = NULL; 120 oop Universe::_out_of_memory_error_class_metaspace = NULL; 121 oop Universe::_out_of_memory_error_array_size = NULL; 122 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 123 oop Universe::_out_of_memory_error_realloc_objects = NULL; 124 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 125 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 126 bool Universe::_verify_in_progress = false; 127 long Universe::verify_flags = Universe::Verify_All; 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 if (strlen(VerifySubSet) > 0) { 688 Universe::initialize_verify_flags(); 689 } 690 691 return JNI_OK; 692 } 693 694 // Choose the heap base address and oop encoding mode 695 // when compressed oops are used: 696 // Unscaled - Use 32-bits oops without encoding when 697 // NarrowOopHeapBaseMin + heap_size < 4Gb 698 // ZeroBased - Use zero based compressed oops with encoding when 699 // NarrowOopHeapBaseMin + heap_size < 32Gb 700 // HeapBased - Use compressed oops with heap base + encoding. 701 702 // 4Gb 703 static const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1); 704 // 32Gb 705 // OopEncodingHeapMax == UnscaledOopHeapMax << LogMinObjAlignmentInBytes; 706 707 char* Universe::preferred_heap_base(size_t heap_size, size_t alignment, NARROW_OOP_MODE mode) { 708 assert(is_size_aligned((size_t)OopEncodingHeapMax, alignment), "Must be"); 709 assert(is_size_aligned((size_t)UnscaledOopHeapMax, alignment), "Must be"); 710 assert(is_size_aligned(heap_size, alignment), "Must be"); 711 712 uintx heap_base_min_address_aligned = align_size_up(HeapBaseMinAddress, alignment); 713 714 size_t base = 0; 715 #ifdef _LP64 716 if (UseCompressedOops) { 717 assert(mode == UnscaledNarrowOop || 718 mode == ZeroBasedNarrowOop || 719 mode == HeapBasedNarrowOop, "mode is invalid"); 720 const size_t total_size = heap_size + heap_base_min_address_aligned; 721 // Return specified base for the first request. 722 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { 723 base = heap_base_min_address_aligned; 724 725 // If the total size is small enough to allow UnscaledNarrowOop then 726 // just use UnscaledNarrowOop. 727 } else if ((total_size <= OopEncodingHeapMax) && (mode != HeapBasedNarrowOop)) { 728 if ((total_size <= UnscaledOopHeapMax) && (mode == UnscaledNarrowOop) && 729 (Universe::narrow_oop_shift() == 0)) { 730 // Use 32-bits oops without encoding and 731 // place heap's top on the 4Gb boundary 732 base = (UnscaledOopHeapMax - heap_size); 733 } else { 734 // Can't reserve with NarrowOopShift == 0 735 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 736 737 if (mode == UnscaledNarrowOop || 738 mode == ZeroBasedNarrowOop && total_size <= UnscaledOopHeapMax) { 739 740 // Use zero based compressed oops with encoding and 741 // place heap's top on the 32Gb boundary in case 742 // total_size > 4Gb or failed to reserve below 4Gb. 743 uint64_t heap_top = OopEncodingHeapMax; 744 745 // For small heaps, save some space for compressed class pointer 746 // space so it can be decoded with no base. 747 if (UseCompressedClassPointers && !UseSharedSpaces && 748 OopEncodingHeapMax <= 32*G) { 749 750 uint64_t class_space = align_size_up(CompressedClassSpaceSize, alignment); 751 assert(is_size_aligned((size_t)OopEncodingHeapMax-class_space, 752 alignment), "difference must be aligned too"); 753 uint64_t new_top = OopEncodingHeapMax-class_space; 754 755 if (total_size <= new_top) { 756 heap_top = new_top; 757 } 758 } 759 760 // Align base to the adjusted top of the heap 761 base = heap_top - heap_size; 762 } 763 } 764 } else { 765 // UnscaledNarrowOop encoding didn't work, and no base was found for ZeroBasedOops or 766 // HeapBasedNarrowOop encoding was requested. So, can't reserve below 32Gb. 767 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 768 } 769 770 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks 771 // used in ReservedHeapSpace() constructors. 772 // The final values will be set in initialize_heap() below. 773 if ((base != 0) && ((base + heap_size) <= OopEncodingHeapMax)) { 774 // Use zero based compressed oops 775 Universe::set_narrow_oop_base(NULL); 776 // Don't need guard page for implicit checks in indexed 777 // addressing mode with zero based Compressed Oops. 778 Universe::set_narrow_oop_use_implicit_null_checks(true); 779 } else { 780 // Set to a non-NULL value so the ReservedSpace ctor computes 781 // the correct no-access prefix. 782 // The final value will be set in initialize_heap() below. 783 Universe::set_narrow_oop_base((address)UnscaledOopHeapMax); 784 #if defined(_WIN64) || defined(AIX) 785 if (UseLargePages) { 786 // Cannot allocate guard pages for implicit checks in indexed 787 // addressing mode when large pages are specified on windows. 788 Universe::set_narrow_oop_use_implicit_null_checks(false); 789 } 790 #endif // _WIN64 791 } 792 } 793 #endif 794 795 assert(is_ptr_aligned((char*)base, alignment), "Must be"); 796 return (char*)base; // also return NULL (don't care) for 32-bit VM 797 } 798 799 jint Universe::initialize_heap() { 800 801 if (UseParallelGC) { 802 #if INCLUDE_ALL_GCS 803 Universe::_collectedHeap = new ParallelScavengeHeap(); 804 #else // INCLUDE_ALL_GCS 805 fatal("UseParallelGC not supported in this VM."); 806 #endif // INCLUDE_ALL_GCS 807 808 } else if (UseG1GC) { 809 #if INCLUDE_ALL_GCS 810 G1CollectorPolicyExt* g1p = new G1CollectorPolicyExt(); 811 g1p->initialize_all(); 812 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); 813 Universe::_collectedHeap = g1h; 814 #else // INCLUDE_ALL_GCS 815 fatal("UseG1GC not supported in java kernel vm."); 816 #endif // INCLUDE_ALL_GCS 817 818 } else { 819 GenCollectorPolicy *gc_policy; 820 821 if (UseSerialGC) { 822 gc_policy = new MarkSweepPolicy(); 823 } else if (UseConcMarkSweepGC) { 824 #if INCLUDE_ALL_GCS 825 if (UseAdaptiveSizePolicy) { 826 gc_policy = new ASConcurrentMarkSweepPolicy(); 827 } else { 828 gc_policy = new ConcurrentMarkSweepPolicy(); 829 } 830 #else // INCLUDE_ALL_GCS 831 fatal("UseConcMarkSweepGC not supported in this VM."); 832 #endif // INCLUDE_ALL_GCS 833 } else { // default old generation 834 gc_policy = new MarkSweepPolicy(); 835 } 836 gc_policy->initialize_all(); 837 838 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); 839 } 840 841 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 842 843 jint status = Universe::heap()->initialize(); 844 if (status != JNI_OK) { 845 return status; 846 } 847 848 #ifdef _LP64 849 if (UseCompressedOops) { 850 // Subtract a page because something can get allocated at heap base. 851 // This also makes implicit null checking work, because the 852 // memory+1 page below heap_base needs to cause a signal. 853 // See needs_explicit_null_check. 854 // Only set the heap base for compressed oops because it indicates 855 // compressed oops for pstack code. 856 if (((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax)) { 857 // Can't reserve heap below 32Gb. 858 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap() 859 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 860 #ifdef AIX 861 // There is no protected page before the heap. This assures all oops 862 // are decoded so that NULL is preserved, so this page will not be accessed. 863 Universe::set_narrow_oop_use_implicit_null_checks(false); 864 #endif 865 } else { 866 Universe::set_narrow_oop_base(0); 867 #ifdef _WIN64 868 if (!Universe::narrow_oop_use_implicit_null_checks()) { 869 // Don't need guard page for implicit checks in indexed addressing 870 // mode with zero based Compressed Oops. 871 Universe::set_narrow_oop_use_implicit_null_checks(true); 872 } 873 #endif // _WIN64 874 if((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 875 // Can't reserve heap below 4Gb. 876 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 877 } else { 878 Universe::set_narrow_oop_shift(0); 879 } 880 } 881 882 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 883 884 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 885 Universe::print_compressed_oops_mode(); 886 } 887 } 888 // Universe::narrow_oop_base() is one page below the heap. 889 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 890 os::vm_page_size()) || 891 Universe::narrow_oop_base() == NULL, "invalid value"); 892 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 893 Universe::narrow_oop_shift() == 0, "invalid value"); 894 #endif 895 896 // We will never reach the CATCH below since Exceptions::_throw will cause 897 // the VM to exit if an exception is thrown during initialization 898 899 if (UseTLAB) { 900 assert(Universe::heap()->supports_tlab_allocation(), 901 "Should support thread-local allocation buffers"); 902 ThreadLocalAllocBuffer::startup_initialization(); 903 } 904 return JNI_OK; 905 } 906 907 void Universe::print_compressed_oops_mode() { 908 tty->cr(); 909 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 910 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); 911 912 tty->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 913 914 if (Universe::narrow_oop_base() != 0) { 915 tty->print(":" PTR_FORMAT, Universe::narrow_oop_base()); 916 } 917 918 if (Universe::narrow_oop_shift() != 0) { 919 tty->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 920 } 921 922 tty->cr(); 923 tty->cr(); 924 } 925 926 // Reserve the Java heap, which is now the same for all GCs. 927 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 928 assert(alignment <= Arguments::conservative_max_heap_alignment(), 929 err_msg("actual alignment "SIZE_FORMAT" must be within maximum heap alignment "SIZE_FORMAT, 930 alignment, Arguments::conservative_max_heap_alignment())); 931 size_t total_reserved = align_size_up(heap_size, alignment); 932 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 933 "heap size is too big for compressed oops"); 934 935 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size()); 936 assert(!UseLargePages 937 || UseParallelGC 938 || use_large_pages, "Wrong alignment to use large pages"); 939 940 char* addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::UnscaledNarrowOop); 941 942 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, addr); 943 944 if (UseCompressedOops) { 945 if (addr != NULL && !total_rs.is_reserved()) { 946 // Failed to reserve at specified address - the requested memory 947 // region is taken already, for example, by 'java' launcher. 948 // Try again to reserver heap higher. 949 addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::ZeroBasedNarrowOop); 950 951 ReservedHeapSpace total_rs0(total_reserved, alignment, 952 use_large_pages, addr); 953 954 if (addr != NULL && !total_rs0.is_reserved()) { 955 // Failed to reserve at specified address again - give up. 956 addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::HeapBasedNarrowOop); 957 assert(addr == NULL, ""); 958 959 ReservedHeapSpace total_rs1(total_reserved, alignment, 960 use_large_pages, addr); 961 total_rs = total_rs1; 962 } else { 963 total_rs = total_rs0; 964 } 965 } 966 } 967 968 if (!total_rs.is_reserved()) { 969 vm_exit_during_initialization(err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", total_reserved/K)); 970 return total_rs; 971 } 972 973 if (UseCompressedOops) { 974 // Universe::initialize_heap() will reset this to NULL if unscaled 975 // or zero-based narrow oops are actually used. 976 address base = (address)(total_rs.base() - os::vm_page_size()); 977 Universe::set_narrow_oop_base(base); 978 } 979 return total_rs; 980 } 981 982 983 // It's the caller's responsibility to ensure glitch-freedom 984 // (if required). 985 void Universe::update_heap_info_at_gc() { 986 _heap_capacity_at_last_gc = heap()->capacity(); 987 _heap_used_at_last_gc = heap()->used(); 988 } 989 990 991 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 992 switch (mode) { 993 case UnscaledNarrowOop: 994 return "32-bit"; 995 case ZeroBasedNarrowOop: 996 return "Zero based"; 997 case HeapBasedNarrowOop: 998 return "Non-zero based"; 999 } 1000 1001 ShouldNotReachHere(); 1002 return ""; 1003 } 1004 1005 1006 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 1007 if (narrow_oop_base() != 0) { 1008 return HeapBasedNarrowOop; 1009 } 1010 1011 if (narrow_oop_shift() != 0) { 1012 return ZeroBasedNarrowOop; 1013 } 1014 1015 return UnscaledNarrowOop; 1016 } 1017 1018 1019 void universe2_init() { 1020 EXCEPTION_MARK; 1021 Universe::genesis(CATCH); 1022 } 1023 1024 1025 // This function is defined in JVM.cpp 1026 extern void initialize_converter_functions(); 1027 1028 bool universe_post_init() { 1029 assert(!is_init_completed(), "Error: initialization not yet completed!"); 1030 Universe::_fully_initialized = true; 1031 EXCEPTION_MARK; 1032 { ResourceMark rm; 1033 Interpreter::initialize(); // needed for interpreter entry points 1034 if (!UseSharedSpaces) { 1035 HandleMark hm(THREAD); 1036 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 1037 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 1038 Universe::reinitialize_itables(CHECK_false); 1039 } 1040 } 1041 1042 HandleMark hm(THREAD); 1043 Klass* k; 1044 instanceKlassHandle k_h; 1045 // Setup preallocated empty java.lang.Class array 1046 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 1047 1048 // Setup preallocated OutOfMemoryError errors 1049 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 1050 k_h = instanceKlassHandle(THREAD, k); 1051 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 1052 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); 1053 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); 1054 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 1055 Universe::_out_of_memory_error_gc_overhead_limit = 1056 k_h->allocate_instance(CHECK_false); 1057 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false); 1058 1059 // Setup preallocated NullPointerException 1060 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1061 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1062 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1063 // Setup preallocated ArithmeticException 1064 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1065 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1066 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1067 // Virtual Machine Error for when we get into a situation we can't resolve 1068 k = SystemDictionary::resolve_or_fail( 1069 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1070 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1071 if (!linked) { 1072 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1073 return false; // initialization failed 1074 } 1075 Universe::_virtual_machine_error_instance = 1076 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1077 1078 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1079 1080 if (!DumpSharedSpaces) { 1081 // These are the only Java fields that are currently set during shared space dumping. 1082 // We prefer to not handle this generally, so we always reinitialize these detail messages. 1083 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1084 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1085 1086 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 1087 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1088 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 1089 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1090 1091 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1092 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1093 1094 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1095 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1096 1097 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 1098 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 1099 1100 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1101 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1102 1103 // Setup the array of errors that have preallocated backtrace 1104 k = Universe::_out_of_memory_error_java_heap->klass(); 1105 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1106 k_h = instanceKlassHandle(THREAD, k); 1107 1108 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1109 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 1110 for (int i=0; i<len; i++) { 1111 oop err = k_h->allocate_instance(CHECK_false); 1112 Handle err_h = Handle(THREAD, err); 1113 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1114 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1115 } 1116 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1117 } 1118 1119 1120 // Setup static method for registering finalizers 1121 // The finalizer klass must be linked before looking up the method, in 1122 // case it needs to get rewritten. 1123 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); 1124 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( 1125 vmSymbols::register_method_name(), 1126 vmSymbols::register_method_signature()); 1127 if (m == NULL || !m->is_static()) { 1128 tty->print_cr("Unable to link/verify Finalizer.register method"); 1129 return false; // initialization failed (cannot throw exception yet) 1130 } 1131 Universe::_finalizer_register_cache->init( 1132 SystemDictionary::Finalizer_klass(), m); 1133 1134 InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->link_class(CHECK_false); 1135 m = InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->find_method( 1136 vmSymbols::throwIllegalAccessError_name(), 1137 vmSymbols::void_method_signature()); 1138 if (m != NULL && !m->is_static()) { 1139 // Note null is okay; this method is used in itables, and if it is null, 1140 // then AbstractMethodError is thrown instead. 1141 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method"); 1142 return false; // initialization failed (cannot throw exception yet) 1143 } 1144 Universe::_throw_illegal_access_error_cache->init( 1145 SystemDictionary::misc_Unsafe_klass(), m); 1146 1147 // Setup method for registering loaded classes in class loader vector 1148 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); 1149 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1150 if (m == NULL || m->is_static()) { 1151 tty->print_cr("Unable to link/verify ClassLoader.addClass method"); 1152 return false; // initialization failed (cannot throw exception yet) 1153 } 1154 Universe::_loader_addClass_cache->init( 1155 SystemDictionary::ClassLoader_klass(), m); 1156 1157 // Setup method for checking protection domain 1158 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false); 1159 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())-> 1160 find_method(vmSymbols::impliesCreateAccessControlContext_name(), 1161 vmSymbols::void_boolean_signature()); 1162 // Allow NULL which should only happen with bootstrapping. 1163 if (m != NULL) { 1164 if (m->is_static()) { 1165 // NoSuchMethodException doesn't actually work because it tries to run the 1166 // <init> function before java_lang_Class is linked. Print error and exit. 1167 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); 1168 return false; // initialization failed 1169 } 1170 Universe::_pd_implies_cache->init( 1171 SystemDictionary::ProtectionDomain_klass(), m); 1172 } 1173 1174 // The folowing is initializing converter functions for serialization in 1175 // JVM.cpp. If we clean up the StrictMath code above we may want to find 1176 // a better solution for this as well. 1177 initialize_converter_functions(); 1178 1179 // This needs to be done before the first scavenge/gc, since 1180 // it's an input to soft ref clearing policy. 1181 { 1182 MutexLocker x(Heap_lock); 1183 Universe::update_heap_info_at_gc(); 1184 } 1185 1186 // ("weak") refs processing infrastructure initialization 1187 Universe::heap()->post_initialize(); 1188 1189 // Initialize performance counters for metaspaces 1190 MetaspaceCounters::initialize_performance_counters(); 1191 CompressedClassSpaceCounters::initialize_performance_counters(); 1192 1193 MemoryService::add_metaspace_memory_pools(); 1194 1195 MemoryService::set_universe_heap(Universe::_collectedHeap); 1196 #if INCLUDE_CDS 1197 if (UseSharedSpaces) { 1198 SharedClassUtil::initialize(CHECK_false); 1199 } 1200 #endif 1201 return true; 1202 } 1203 1204 1205 void Universe::compute_base_vtable_size() { 1206 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1207 } 1208 1209 1210 // %%% The Universe::flush_foo methods belong in CodeCache. 1211 1212 // Flushes compiled methods dependent on dependee. 1213 void Universe::flush_dependents_on(instanceKlassHandle dependee) { 1214 assert_lock_strong(Compile_lock); 1215 1216 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1217 1218 // CodeCache can only be updated by a thread_in_VM and they will all be 1219 // stopped dring the safepoint so CodeCache will be safe to update without 1220 // holding the CodeCache_lock. 1221 1222 KlassDepChange changes(dependee); 1223 1224 // Compute the dependent nmethods 1225 if (CodeCache::mark_for_deoptimization(changes) > 0) { 1226 // At least one nmethod has been marked for deoptimization 1227 VM_Deoptimize op; 1228 VMThread::execute(&op); 1229 } 1230 } 1231 1232 // Flushes compiled methods dependent on a particular CallSite 1233 // instance when its target is different than the given MethodHandle. 1234 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) { 1235 assert_lock_strong(Compile_lock); 1236 1237 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1238 1239 // CodeCache can only be updated by a thread_in_VM and they will all be 1240 // stopped dring the safepoint so CodeCache will be safe to update without 1241 // holding the CodeCache_lock. 1242 1243 CallSiteDepChange changes(call_site(), method_handle()); 1244 1245 // Compute the dependent nmethods that have a reference to a 1246 // CallSite object. We use InstanceKlass::mark_dependent_nmethod 1247 // directly instead of CodeCache::mark_for_deoptimization because we 1248 // want dependents on the call site class only not all classes in 1249 // the ContextStream. 1250 int marked = 0; 1251 { 1252 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1253 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass()); 1254 marked = call_site_klass->mark_dependent_nmethods(changes); 1255 } 1256 if (marked > 0) { 1257 // At least one nmethod has been marked for deoptimization 1258 VM_Deoptimize op; 1259 VMThread::execute(&op); 1260 } 1261 } 1262 1263 #ifdef HOTSWAP 1264 // Flushes compiled methods dependent on dependee in the evolutionary sense 1265 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { 1266 // --- Compile_lock is not held. However we are at a safepoint. 1267 assert_locked_or_safepoint(Compile_lock); 1268 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1269 1270 // CodeCache can only be updated by a thread_in_VM and they will all be 1271 // stopped dring the safepoint so CodeCache will be safe to update without 1272 // holding the CodeCache_lock. 1273 1274 // Compute the dependent nmethods 1275 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { 1276 // At least one nmethod has been marked for deoptimization 1277 1278 // All this already happens inside a VM_Operation, so we'll do all the work here. 1279 // Stuff copied from VM_Deoptimize and modified slightly. 1280 1281 // We do not want any GCs to happen while we are in the middle of this VM operation 1282 ResourceMark rm; 1283 DeoptimizationMarker dm; 1284 1285 // Deoptimize all activations depending on marked nmethods 1286 Deoptimization::deoptimize_dependents(); 1287 1288 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1289 CodeCache::make_marked_nmethods_not_entrant(); 1290 } 1291 } 1292 #endif // HOTSWAP 1293 1294 1295 // Flushes compiled methods dependent on dependee 1296 void Universe::flush_dependents_on_method(methodHandle m_h) { 1297 // --- Compile_lock is not held. However we are at a safepoint. 1298 assert_locked_or_safepoint(Compile_lock); 1299 1300 // CodeCache can only be updated by a thread_in_VM and they will all be 1301 // stopped dring the safepoint so CodeCache will be safe to update without 1302 // holding the CodeCache_lock. 1303 1304 // Compute the dependent nmethods 1305 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { 1306 // At least one nmethod has been marked for deoptimization 1307 1308 // All this already happens inside a VM_Operation, so we'll do all the work here. 1309 // Stuff copied from VM_Deoptimize and modified slightly. 1310 1311 // We do not want any GCs to happen while we are in the middle of this VM operation 1312 ResourceMark rm; 1313 DeoptimizationMarker dm; 1314 1315 // Deoptimize all activations depending on marked nmethods 1316 Deoptimization::deoptimize_dependents(); 1317 1318 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1319 CodeCache::make_marked_nmethods_not_entrant(); 1320 } 1321 } 1322 1323 void Universe::print() { 1324 print_on(gclog_or_tty); 1325 } 1326 1327 void Universe::print_on(outputStream* st, bool extended) { 1328 st->print_cr("Heap"); 1329 if (!extended) { 1330 heap()->print_on(st); 1331 } else { 1332 heap()->print_extended_on(st); 1333 } 1334 } 1335 1336 void Universe::print_heap_at_SIGBREAK() { 1337 if (PrintHeapAtSIGBREAK) { 1338 MutexLocker hl(Heap_lock); 1339 print_on(tty); 1340 tty->cr(); 1341 tty->flush(); 1342 } 1343 } 1344 1345 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1346 st->print_cr("{Heap before GC invocations=%u (full %u):", 1347 heap()->total_collections(), 1348 heap()->total_full_collections()); 1349 if (!PrintHeapAtGCExtended || ignore_extended) { 1350 heap()->print_on(st); 1351 } else { 1352 heap()->print_extended_on(st); 1353 } 1354 } 1355 1356 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1357 st->print_cr("Heap after GC invocations=%u (full %u):", 1358 heap()->total_collections(), 1359 heap()->total_full_collections()); 1360 if (!PrintHeapAtGCExtended || ignore_extended) { 1361 heap()->print_on(st); 1362 } else { 1363 heap()->print_extended_on(st); 1364 } 1365 st->print_cr("}"); 1366 } 1367 1368 void Universe::initialize_verify_flags() { 1369 verify_flags = 0; 1370 const char delimiter[] = " ,"; 1371 1372 size_t length = strlen(VerifySubSet); 1373 char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal); 1374 strncpy(subset_list, VerifySubSet, length + 1); 1375 1376 char* token = strtok(subset_list, delimiter); 1377 while (token != NULL) { 1378 if (strcmp(token, "threads") == 0) { 1379 verify_flags |= Verify_Threads; 1380 } else if (strcmp(token, "heap") == 0) { 1381 verify_flags |= Verify_Heap; 1382 } else if (strcmp(token, "symbol_table") == 0) { 1383 verify_flags |= Verify_SymbolTable; 1384 } else if (strcmp(token, "string_table") == 0) { 1385 verify_flags |= Verify_StringTable; 1386 } else if (strcmp(token, "codecache") == 0) { 1387 verify_flags |= Verify_CodeCache; 1388 } else if (strcmp(token, "dictionary") == 0) { 1389 verify_flags |= Verify_SystemDictionary; 1390 } else if (strcmp(token, "classloader_data_graph") == 0) { 1391 verify_flags |= Verify_ClassLoaderDataGraph; 1392 } else if (strcmp(token, "metaspace") == 0) { 1393 verify_flags |= Verify_MetaspaceAux; 1394 } else if (strcmp(token, "jni_handles") == 0) { 1395 verify_flags |= Verify_JNIHandles; 1396 } else if (strcmp(token, "c-heap") == 0) { 1397 verify_flags |= Verify_CHeap; 1398 } else if (strcmp(token, "codecache_oops") == 0) { 1399 verify_flags |= Verify_CodeCacheOops; 1400 } else { 1401 vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token)); 1402 } 1403 token = strtok(NULL, delimiter); 1404 } 1405 FREE_C_HEAP_ARRAY(char, subset_list, mtInternal); 1406 } 1407 1408 bool Universe::should_verify_subset(uint subset) { 1409 if (verify_flags & subset) { 1410 return true; 1411 } 1412 return false; 1413 } 1414 1415 void Universe::verify(VerifyOption option, const char* prefix, bool silent) { 1416 // The use of _verify_in_progress is a temporary work around for 1417 // 6320749. Don't bother with a creating a class to set and clear 1418 // it since it is only used in this method and the control flow is 1419 // straight forward. 1420 _verify_in_progress = true; 1421 1422 COMPILER2_PRESENT( 1423 assert(!DerivedPointerTable::is_active(), 1424 "DPT should not be active during verification " 1425 "(of thread stacks below)"); 1426 ) 1427 1428 ResourceMark rm; 1429 HandleMark hm; // Handles created during verification can be zapped 1430 _verify_count++; 1431 1432 if (!silent) gclog_or_tty->print("%s", prefix); 1433 if (!silent) gclog_or_tty->print("[Verifying "); 1434 if (should_verify_subset(Verify_Threads)) { 1435 if (!silent) gclog_or_tty->print("Threads "); 1436 Threads::verify(); 1437 } 1438 if (should_verify_subset(Verify_Heap)) { 1439 if (!silent) gclog_or_tty->print("Heap "); 1440 heap()->verify(silent, option); 1441 } 1442 if (should_verify_subset(Verify_SymbolTable)) { 1443 if (!silent) gclog_or_tty->print("SymbolTable "); 1444 SymbolTable::verify(); 1445 } 1446 if (should_verify_subset(Verify_StringTable)) { 1447 if (!silent) gclog_or_tty->print("StringTable "); 1448 StringTable::verify(); 1449 } 1450 if (should_verify_subset(Verify_CodeCache)) { 1451 { 1452 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1453 if (!silent) gclog_or_tty->print("CodeCache "); 1454 CodeCache::verify(); 1455 } 1456 } 1457 if (should_verify_subset(Verify_SystemDictionary)) { 1458 if (!silent) gclog_or_tty->print("SystemDictionary "); 1459 SystemDictionary::verify(); 1460 } 1461 #ifndef PRODUCT 1462 if (should_verify_subset(Verify_ClassLoaderDataGraph)) { 1463 if (!silent) gclog_or_tty->print("ClassLoaderDataGraph "); 1464 ClassLoaderDataGraph::verify(); 1465 } 1466 #endif 1467 if (should_verify_subset(Verify_MetaspaceAux)) { 1468 if (!silent) gclog_or_tty->print("MetaspaceAux "); 1469 MetaspaceAux::verify_free_chunks(); 1470 } 1471 if (should_verify_subset(Verify_JNIHandles)) { 1472 if (!silent) gclog_or_tty->print("JNIHandles "); 1473 JNIHandles::verify(); 1474 } 1475 if (should_verify_subset(Verify_CHeap)) { 1476 if (!silent) gclog_or_tty->print("C-heap "); 1477 os::check_heap(); 1478 } 1479 if (should_verify_subset(Verify_CodeCacheOops)) { 1480 if (!silent) gclog_or_tty->print("CodeCache Oops "); 1481 CodeCache::verify_oops(); 1482 } 1483 if (!silent) gclog_or_tty->print_cr("]"); 1484 1485 _verify_in_progress = false; 1486 } 1487 1488 // Oop verification (see MacroAssembler::verify_oop) 1489 1490 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; 1491 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; 1492 1493 1494 #ifndef PRODUCT 1495 1496 static void calculate_verify_data(uintptr_t verify_data[2], 1497 HeapWord* low_boundary, 1498 HeapWord* high_boundary) { 1499 assert(low_boundary < high_boundary, "bad interval"); 1500 1501 // decide which low-order bits we require to be clear: 1502 size_t alignSize = MinObjAlignmentInBytes; 1503 size_t min_object_size = CollectedHeap::min_fill_size(); 1504 1505 // make an inclusive limit: 1506 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1507 uintptr_t min = (uintptr_t)low_boundary; 1508 assert(min < max, "bad interval"); 1509 uintptr_t diff = max ^ min; 1510 1511 // throw away enough low-order bits to make the diff vanish 1512 uintptr_t mask = (uintptr_t)(-1); 1513 while ((mask & diff) != 0) 1514 mask <<= 1; 1515 uintptr_t bits = (min & mask); 1516 assert(bits == (max & mask), "correct mask"); 1517 // check an intermediate value between min and max, just to make sure: 1518 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1519 1520 // require address alignment, too: 1521 mask |= (alignSize - 1); 1522 1523 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { 1524 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); 1525 } 1526 verify_data[0] = mask; 1527 verify_data[1] = bits; 1528 } 1529 1530 // Oop verification (see MacroAssembler::verify_oop) 1531 1532 uintptr_t Universe::verify_oop_mask() { 1533 MemRegion m = heap()->reserved_region(); 1534 calculate_verify_data(_verify_oop_data, 1535 m.start(), 1536 m.end()); 1537 return _verify_oop_data[0]; 1538 } 1539 1540 1541 1542 uintptr_t Universe::verify_oop_bits() { 1543 verify_oop_mask(); 1544 return _verify_oop_data[1]; 1545 } 1546 1547 uintptr_t Universe::verify_mark_mask() { 1548 return markOopDesc::lock_mask_in_place; 1549 } 1550 1551 uintptr_t Universe::verify_mark_bits() { 1552 intptr_t mask = verify_mark_mask(); 1553 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1554 assert((bits & ~mask) == 0, "no stray header bits"); 1555 return bits; 1556 } 1557 #endif // PRODUCT 1558 1559 1560 void Universe::compute_verify_oop_data() { 1561 verify_oop_mask(); 1562 verify_oop_bits(); 1563 verify_mark_mask(); 1564 verify_mark_bits(); 1565 } 1566 1567 1568 void LatestMethodCache::init(Klass* k, Method* m) { 1569 if (!UseSharedSpaces) { 1570 _klass = k; 1571 } 1572 #ifndef PRODUCT 1573 else { 1574 // sharing initilization should have already set up _klass 1575 assert(_klass != NULL, "just checking"); 1576 } 1577 #endif 1578 1579 _method_idnum = m->method_idnum(); 1580 assert(_method_idnum >= 0, "sanity check"); 1581 } 1582 1583 1584 Method* LatestMethodCache::get_method() { 1585 if (klass() == NULL) return NULL; 1586 InstanceKlass* ik = InstanceKlass::cast(klass()); 1587 Method* m = ik->method_with_idnum(method_idnum()); 1588 assert(m != NULL, "sanity check"); 1589 return m; 1590 } 1591 1592 1593 #ifdef ASSERT 1594 // Release dummy object(s) at bottom of heap 1595 bool Universe::release_fullgc_alot_dummy() { 1596 MutexLocker ml(FullGCALot_lock); 1597 if (_fullgc_alot_dummy_array != NULL) { 1598 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1599 // No more dummies to release, release entire array instead 1600 _fullgc_alot_dummy_array = NULL; 1601 return false; 1602 } 1603 if (!UseConcMarkSweepGC) { 1604 // Release dummy at bottom of old generation 1605 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1606 } 1607 // Release dummy at bottom of permanent generation 1608 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1609 } 1610 return true; 1611 } 1612 1613 #endif // ASSERT