1 /* 2 * Copyright (c) 1997, 2013, 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/symbolTable.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/gcLocker.inline.hpp" 38 #include "memory/genCollectedHeap.hpp" 39 #include "memory/genRemSet.hpp" 40 #include "memory/generation.hpp" 41 #include "memory/metadataFactory.hpp" 42 #include "memory/metaspaceShared.hpp" 43 #include "memory/oopFactory.hpp" 44 #include "memory/space.hpp" 45 #include "memory/universe.hpp" 46 #include "memory/universe.inline.hpp" 47 #include "oops/constantPool.hpp" 48 #include "oops/instanceClassLoaderKlass.hpp" 49 #include "oops/instanceKlass.hpp" 50 #include "oops/instanceMirrorKlass.hpp" 51 #include "oops/instanceRefKlass.hpp" 52 #include "oops/oop.inline.hpp" 53 #include "oops/typeArrayKlass.hpp" 54 #include "prims/jvmtiRedefineClassesTrace.hpp" 55 #include "runtime/arguments.hpp" 56 #include "runtime/deoptimization.hpp" 57 #include "runtime/fprofiler.hpp" 58 #include "runtime/handles.inline.hpp" 59 #include "runtime/init.hpp" 60 #include "runtime/java.hpp" 61 #include "runtime/javaCalls.hpp" 62 #include "runtime/sharedRuntime.hpp" 63 #include "runtime/synchronizer.hpp" 64 #include "runtime/thread.inline.hpp" 65 #include "runtime/timer.hpp" 66 #include "runtime/vm_operations.hpp" 67 #include "services/memoryService.hpp" 68 #include "utilities/copy.hpp" 69 #include "utilities/events.hpp" 70 #include "utilities/hashtable.inline.hpp" 71 #include "utilities/preserveException.hpp" 72 #include "utilities/macros.hpp" 73 #if INCLUDE_ALL_GCS 74 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" 75 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp" 76 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 77 #include "gc_implementation/g1/g1CollectorPolicy.hpp" 78 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 79 #endif // INCLUDE_ALL_GCS 80 81 // Known objects 82 Klass* Universe::_boolArrayKlassObj = NULL; 83 Klass* Universe::_byteArrayKlassObj = NULL; 84 Klass* Universe::_charArrayKlassObj = NULL; 85 Klass* Universe::_intArrayKlassObj = NULL; 86 Klass* Universe::_shortArrayKlassObj = NULL; 87 Klass* Universe::_longArrayKlassObj = NULL; 88 Klass* Universe::_singleArrayKlassObj = NULL; 89 Klass* Universe::_doubleArrayKlassObj = NULL; 90 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 91 Klass* Universe::_objectArrayKlassObj = NULL; 92 oop Universe::_int_mirror = NULL; 93 oop Universe::_float_mirror = NULL; 94 oop Universe::_double_mirror = NULL; 95 oop Universe::_byte_mirror = NULL; 96 oop Universe::_bool_mirror = NULL; 97 oop Universe::_char_mirror = NULL; 98 oop Universe::_long_mirror = NULL; 99 oop Universe::_short_mirror = NULL; 100 oop Universe::_void_mirror = NULL; 101 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 102 oop Universe::_main_thread_group = NULL; 103 oop Universe::_system_thread_group = NULL; 104 objArrayOop Universe::_the_empty_class_klass_array = NULL; 105 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 106 oop Universe::_the_null_string = NULL; 107 oop Universe::_the_min_jint_string = NULL; 108 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 109 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 110 LatestMethodCache* Universe::_pd_implies_cache = NULL; 111 oop Universe::_out_of_memory_error_java_heap = NULL; 112 oop Universe::_out_of_memory_error_metaspace = NULL; 113 oop Universe::_out_of_memory_error_class_metaspace = NULL; 114 oop Universe::_out_of_memory_error_array_size = NULL; 115 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 116 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 117 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 118 bool Universe::_verify_in_progress = false; 119 oop Universe::_null_ptr_exception_instance = NULL; 120 oop Universe::_arithmetic_exception_instance = NULL; 121 oop Universe::_virtual_machine_error_instance = NULL; 122 oop Universe::_vm_exception = NULL; 123 Array<int>* Universe::_the_empty_int_array = NULL; 124 Array<u2>* Universe::_the_empty_short_array = NULL; 125 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 126 Array<Method*>* Universe::_the_empty_method_array = NULL; 127 128 // These variables are guarded by FullGCALot_lock. 129 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 130 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 131 132 // Heap 133 int Universe::_verify_count = 0; 134 135 int Universe::_base_vtable_size = 0; 136 bool Universe::_bootstrapping = false; 137 bool Universe::_fully_initialized = false; 138 139 size_t Universe::_heap_capacity_at_last_gc; 140 size_t Universe::_heap_used_at_last_gc = 0; 141 142 CollectedHeap* Universe::_collectedHeap = NULL; 143 144 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 145 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 146 address Universe::_narrow_ptrs_base; 147 148 void Universe::basic_type_classes_do(void f(Klass*)) { 149 f(boolArrayKlassObj()); 150 f(byteArrayKlassObj()); 151 f(charArrayKlassObj()); 152 f(intArrayKlassObj()); 153 f(shortArrayKlassObj()); 154 f(longArrayKlassObj()); 155 f(singleArrayKlassObj()); 156 f(doubleArrayKlassObj()); 157 } 158 159 void Universe::oops_do(OopClosure* f, bool do_all) { 160 161 f->do_oop((oop*) &_int_mirror); 162 f->do_oop((oop*) &_float_mirror); 163 f->do_oop((oop*) &_double_mirror); 164 f->do_oop((oop*) &_byte_mirror); 165 f->do_oop((oop*) &_bool_mirror); 166 f->do_oop((oop*) &_char_mirror); 167 f->do_oop((oop*) &_long_mirror); 168 f->do_oop((oop*) &_short_mirror); 169 f->do_oop((oop*) &_void_mirror); 170 171 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 172 f->do_oop((oop*) &_mirrors[i]); 173 } 174 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 175 176 f->do_oop((oop*)&_the_empty_class_klass_array); 177 f->do_oop((oop*)&_the_null_string); 178 f->do_oop((oop*)&_the_min_jint_string); 179 f->do_oop((oop*)&_out_of_memory_error_java_heap); 180 f->do_oop((oop*)&_out_of_memory_error_metaspace); 181 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 182 f->do_oop((oop*)&_out_of_memory_error_array_size); 183 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 184 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 185 f->do_oop((oop*)&_null_ptr_exception_instance); 186 f->do_oop((oop*)&_arithmetic_exception_instance); 187 f->do_oop((oop*)&_virtual_machine_error_instance); 188 f->do_oop((oop*)&_main_thread_group); 189 f->do_oop((oop*)&_system_thread_group); 190 f->do_oop((oop*)&_vm_exception); 191 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 192 } 193 194 // Serialize metadata in and out of CDS archive, not oops. 195 void Universe::serialize(SerializeClosure* f, bool do_all) { 196 197 f->do_ptr((void**)&_boolArrayKlassObj); 198 f->do_ptr((void**)&_byteArrayKlassObj); 199 f->do_ptr((void**)&_charArrayKlassObj); 200 f->do_ptr((void**)&_intArrayKlassObj); 201 f->do_ptr((void**)&_shortArrayKlassObj); 202 f->do_ptr((void**)&_longArrayKlassObj); 203 f->do_ptr((void**)&_singleArrayKlassObj); 204 f->do_ptr((void**)&_doubleArrayKlassObj); 205 f->do_ptr((void**)&_objectArrayKlassObj); 206 207 { 208 for (int i = 0; i < T_VOID+1; i++) { 209 if (_typeArrayKlassObjs[i] != NULL) { 210 assert(i >= T_BOOLEAN, "checking"); 211 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 212 } else if (do_all) { 213 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 214 } 215 } 216 } 217 218 f->do_ptr((void**)&_the_array_interfaces_array); 219 f->do_ptr((void**)&_the_empty_int_array); 220 f->do_ptr((void**)&_the_empty_short_array); 221 f->do_ptr((void**)&_the_empty_method_array); 222 f->do_ptr((void**)&_the_empty_klass_array); 223 _finalizer_register_cache->serialize(f); 224 _loader_addClass_cache->serialize(f); 225 _pd_implies_cache->serialize(f); 226 } 227 228 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 229 if (size < alignment || size % alignment != 0) { 230 vm_exit_during_initialization( 231 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 232 } 233 } 234 235 void initialize_basic_type_klass(Klass* k, TRAPS) { 236 Klass* ok = SystemDictionary::Object_klass(); 237 if (UseSharedSpaces) { 238 assert(k->super() == ok, "u3"); 239 k->restore_unshareable_info(CHECK); 240 } else { 241 k->initialize_supers(ok, CHECK); 242 } 243 k->append_to_sibling_list(); 244 } 245 246 void Universe::genesis(TRAPS) { 247 ResourceMark rm; 248 249 { FlagSetting fs(_bootstrapping, true); 250 251 { MutexLocker mc(Compile_lock); 252 253 // determine base vtable size; without that we cannot create the array klasses 254 compute_base_vtable_size(); 255 256 if (!UseSharedSpaces) { 257 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 258 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 259 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 260 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 261 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 262 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 263 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 264 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 265 266 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 267 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 268 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 269 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 270 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 271 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 272 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 273 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 274 275 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 276 277 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 278 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 279 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 280 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 281 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 282 } 283 } 284 285 vmSymbols::initialize(CHECK); 286 287 SystemDictionary::initialize(CHECK); 288 289 Klass* ok = SystemDictionary::Object_klass(); 290 291 _the_null_string = StringTable::intern("null", CHECK); 292 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 293 294 if (UseSharedSpaces) { 295 // Verify shared interfaces array. 296 assert(_the_array_interfaces_array->at(0) == 297 SystemDictionary::Cloneable_klass(), "u3"); 298 assert(_the_array_interfaces_array->at(1) == 299 SystemDictionary::Serializable_klass(), "u3"); 300 } else { 301 // Set up shared interfaces array. (Do this before supers are set up.) 302 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 303 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 304 } 305 306 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 307 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 308 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 309 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 310 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 311 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 312 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 313 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 314 } // end of core bootstrapping 315 316 // Maybe this could be lifted up now that object array can be initialized 317 // during the bootstrapping. 318 319 // OLD 320 // Initialize _objectArrayKlass after core bootstraping to make 321 // sure the super class is set up properly for _objectArrayKlass. 322 // --- 323 // NEW 324 // Since some of the old system object arrays have been converted to 325 // ordinary object arrays, _objectArrayKlass will be loaded when 326 // SystemDictionary::initialize(CHECK); is run. See the extra check 327 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 328 _objectArrayKlassObj = InstanceKlass:: 329 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 330 // OLD 331 // Add the class to the class hierarchy manually to make sure that 332 // its vtable is initialized after core bootstrapping is completed. 333 // --- 334 // New 335 // Have already been initialized. 336 _objectArrayKlassObj->append_to_sibling_list(); 337 338 // Compute is_jdk version flags. 339 // Only 1.3 or later has the java.lang.Shutdown class. 340 // Only 1.4 or later has the java.lang.CharSequence interface. 341 // Only 1.5 or later has the java.lang.management.MemoryUsage class. 342 if (JDK_Version::is_partially_initialized()) { 343 uint8_t jdk_version; 344 Klass* k = SystemDictionary::resolve_or_null( 345 vmSymbols::java_lang_management_MemoryUsage(), THREAD); 346 CLEAR_PENDING_EXCEPTION; // ignore exceptions 347 if (k == NULL) { 348 k = SystemDictionary::resolve_or_null( 349 vmSymbols::java_lang_CharSequence(), THREAD); 350 CLEAR_PENDING_EXCEPTION; // ignore exceptions 351 if (k == NULL) { 352 k = SystemDictionary::resolve_or_null( 353 vmSymbols::java_lang_Shutdown(), THREAD); 354 CLEAR_PENDING_EXCEPTION; // ignore exceptions 355 if (k == NULL) { 356 jdk_version = 2; 357 } else { 358 jdk_version = 3; 359 } 360 } else { 361 jdk_version = 4; 362 } 363 } else { 364 jdk_version = 5; 365 } 366 JDK_Version::fully_initialize(jdk_version); 367 } 368 369 #ifdef ASSERT 370 if (FullGCALot) { 371 // Allocate an array of dummy objects. 372 // We'd like these to be at the bottom of the old generation, 373 // so that when we free one and then collect, 374 // (almost) the whole heap moves 375 // and we find out if we actually update all the oops correctly. 376 // But we can't allocate directly in the old generation, 377 // so we allocate wherever, and hope that the first collection 378 // moves these objects to the bottom of the old generation. 379 // We can allocate directly in the permanent generation, so we do. 380 int size; 381 if (UseConcMarkSweepGC) { 382 warning("Using +FullGCALot with concurrent mark sweep gc " 383 "will not force all objects to relocate"); 384 size = FullGCALotDummies; 385 } else { 386 size = FullGCALotDummies * 2; 387 } 388 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 389 objArrayHandle dummy_array(THREAD, naked_array); 390 int i = 0; 391 while (i < size) { 392 // Allocate dummy in old generation 393 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); 394 dummy_array->obj_at_put(i++, dummy); 395 } 396 { 397 // Only modify the global variable inside the mutex. 398 // If we had a race to here, the other dummy_array instances 399 // and their elements just get dropped on the floor, which is fine. 400 MutexLocker ml(FullGCALot_lock); 401 if (_fullgc_alot_dummy_array == NULL) { 402 _fullgc_alot_dummy_array = dummy_array(); 403 } 404 } 405 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 406 } 407 #endif 408 409 // Initialize dependency array for null class loader 410 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 411 412 } 413 414 // CDS support for patching vtables in metadata in the shared archive. 415 // All types inherited from Metadata have vtables, but not types inherited 416 // from MetaspaceObj, because the latter does not have virtual functions. 417 // If the metadata type has a vtable, it cannot be shared in the read-only 418 // section of the CDS archive, because the vtable pointer is patched. 419 static inline void add_vtable(void** list, int* n, void* o, int count) { 420 guarantee((*n) < count, "vtable list too small"); 421 void* vtable = dereference_vptr(o); 422 assert(*(void**)(vtable) != NULL, "invalid vtable"); 423 list[(*n)++] = vtable; 424 } 425 426 void Universe::init_self_patching_vtbl_list(void** list, int count) { 427 int n = 0; 428 { InstanceKlass o; add_vtable(list, &n, &o, count); } 429 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 430 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 431 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 432 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 433 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 434 { Method o; add_vtable(list, &n, &o, count); } 435 { ConstantPool o; add_vtable(list, &n, &o, count); } 436 } 437 438 void Universe::initialize_basic_type_mirrors(TRAPS) { 439 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 440 _int_mirror = 441 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 442 _float_mirror = 443 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 444 _double_mirror = 445 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 446 _byte_mirror = 447 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 448 _bool_mirror = 449 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 450 _char_mirror = 451 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 452 _long_mirror = 453 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 454 _short_mirror = 455 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 456 _void_mirror = 457 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 458 459 _mirrors[T_INT] = _int_mirror; 460 _mirrors[T_FLOAT] = _float_mirror; 461 _mirrors[T_DOUBLE] = _double_mirror; 462 _mirrors[T_BYTE] = _byte_mirror; 463 _mirrors[T_BOOLEAN] = _bool_mirror; 464 _mirrors[T_CHAR] = _char_mirror; 465 _mirrors[T_LONG] = _long_mirror; 466 _mirrors[T_SHORT] = _short_mirror; 467 _mirrors[T_VOID] = _void_mirror; 468 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); 469 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); 470 } 471 472 void Universe::fixup_mirrors(TRAPS) { 473 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 474 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 475 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 476 // that the number of objects allocated at this point is very small. 477 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 478 HandleMark hm(THREAD); 479 // Cache the start of the static fields 480 InstanceMirrorKlass::init_offset_of_static_fields(); 481 482 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 483 int list_length = list->length(); 484 for (int i = 0; i < list_length; i++) { 485 Klass* k = list->at(i); 486 assert(k->is_klass(), "List should only hold classes"); 487 EXCEPTION_MARK; 488 KlassHandle kh(THREAD, k); 489 java_lang_Class::fixup_mirror(kh, CATCH); 490 } 491 delete java_lang_Class::fixup_mirror_list(); 492 java_lang_Class::set_fixup_mirror_list(NULL); 493 } 494 495 static bool has_run_finalizers_on_exit = false; 496 497 void Universe::run_finalizers_on_exit() { 498 if (has_run_finalizers_on_exit) return; 499 has_run_finalizers_on_exit = true; 500 501 // Called on VM exit. This ought to be run in a separate thread. 502 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 503 { 504 PRESERVE_EXCEPTION_MARK; 505 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 506 JavaValue result(T_VOID); 507 JavaCalls::call_static( 508 &result, 509 finalizer_klass, 510 vmSymbols::run_finalizers_on_exit_name(), 511 vmSymbols::void_method_signature(), 512 THREAD 513 ); 514 // Ignore any pending exceptions 515 CLEAR_PENDING_EXCEPTION; 516 } 517 } 518 519 520 // initialize_vtable could cause gc if 521 // 1) we specified true to initialize_vtable and 522 // 2) this ran after gc was enabled 523 // In case those ever change we use handles for oops 524 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 525 // init vtable of k and all subclasses 526 Klass* ko = k_h(); 527 klassVtable* vt = ko->vtable(); 528 if (vt) vt->initialize_vtable(false, CHECK); 529 if (ko->oop_is_instance()) { 530 InstanceKlass* ik = (InstanceKlass*)ko; 531 for (KlassHandle s_h(THREAD, ik->subklass()); 532 s_h() != NULL; 533 s_h = KlassHandle(THREAD, s_h()->next_sibling())) { 534 reinitialize_vtable_of(s_h, CHECK); 535 } 536 } 537 } 538 539 540 void initialize_itable_for_klass(Klass* k, TRAPS) { 541 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 542 } 543 544 545 void Universe::reinitialize_itables(TRAPS) { 546 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 547 548 } 549 550 551 bool Universe::on_page_boundary(void* addr) { 552 return ((uintptr_t) addr) % os::vm_page_size() == 0; 553 } 554 555 556 bool Universe::should_fill_in_stack_trace(Handle throwable) { 557 // never attempt to fill in the stack trace of preallocated errors that do not have 558 // backtrace. These errors are kept alive forever and may be "re-used" when all 559 // preallocated errors with backtrace have been consumed. Also need to avoid 560 // a potential loop which could happen if an out of memory occurs when attempting 561 // to allocate the backtrace. 562 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 563 (throwable() != Universe::_out_of_memory_error_metaspace) && 564 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 565 (throwable() != Universe::_out_of_memory_error_array_size) && 566 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); 567 } 568 569 570 oop Universe::gen_out_of_memory_error(oop default_err) { 571 // generate an out of memory error: 572 // - if there is a preallocated error with backtrace available then return it wth 573 // a filled in stack trace. 574 // - if there are no preallocated errors with backtrace available then return 575 // an error without backtrace. 576 int next; 577 if (_preallocated_out_of_memory_error_avail_count > 0) { 578 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 579 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 580 } else { 581 next = -1; 582 } 583 if (next < 0) { 584 // all preallocated errors have been used. 585 // return default 586 return default_err; 587 } else { 588 // get the error object at the slot and set set it to NULL so that the 589 // array isn't keeping it alive anymore. 590 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 591 assert(exc != NULL, "slot has been used already"); 592 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 593 594 // use the message from the default error 595 oop msg = java_lang_Throwable::message(default_err); 596 assert(msg != NULL, "no message"); 597 java_lang_Throwable::set_message(exc, msg); 598 599 // populate the stack trace and return it. 600 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 601 return exc; 602 } 603 } 604 605 intptr_t Universe::_non_oop_bits = 0; 606 607 void* Universe::non_oop_word() { 608 // Neither the high bits nor the low bits of this value is allowed 609 // to look like (respectively) the high or low bits of a real oop. 610 // 611 // High and low are CPU-specific notions, but low always includes 612 // the low-order bit. Since oops are always aligned at least mod 4, 613 // setting the low-order bit will ensure that the low half of the 614 // word will never look like that of a real oop. 615 // 616 // Using the OS-supplied non-memory-address word (usually 0 or -1) 617 // will take care of the high bits, however many there are. 618 619 if (_non_oop_bits == 0) { 620 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 621 } 622 623 return (void*)_non_oop_bits; 624 } 625 626 jint universe_init() { 627 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 628 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 629 "LogHeapWordSize is incorrect."); 630 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 631 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 632 "oop size is not not a multiple of HeapWord size"); 633 TraceTime timer("Genesis", TraceStartupTime); 634 GC_locker::lock(); // do not allow gc during bootstrapping 635 JavaClasses::compute_hard_coded_offsets(); 636 637 jint status = Universe::initialize_heap(); 638 if (status != JNI_OK) { 639 return status; 640 } 641 642 Metaspace::global_initialize(); 643 644 // Create memory for metadata. Must be after initializing heap for 645 // DumpSharedSpaces. 646 ClassLoaderData::init_null_class_loader_data(); 647 648 // We have a heap so create the Method* caches before 649 // Metaspace::initialize_shared_spaces() tries to populate them. 650 Universe::_finalizer_register_cache = new LatestMethodCache(); 651 Universe::_loader_addClass_cache = new LatestMethodCache(); 652 Universe::_pd_implies_cache = new LatestMethodCache(); 653 654 if (UseSharedSpaces) { 655 // Read the data structures supporting the shared spaces (shared 656 // system dictionary, symbol table, etc.). After that, access to 657 // the file (other than the mapped regions) is no longer needed, and 658 // the file is closed. Closing the file does not affect the 659 // currently mapped regions. 660 MetaspaceShared::initialize_shared_spaces(); 661 StringTable::create_table(); 662 } else { 663 SymbolTable::create_table(); 664 StringTable::create_table(); 665 ClassLoader::create_package_info_table(); 666 } 667 668 return JNI_OK; 669 } 670 671 // Choose the heap base address and oop encoding mode 672 // when compressed oops are used: 673 // Unscaled - Use 32-bits oops without encoding when 674 // NarrowOopHeapBaseMin + heap_size < 4Gb 675 // ZeroBased - Use zero based compressed oops with encoding when 676 // NarrowOopHeapBaseMin + heap_size < 32Gb 677 // HeapBased - Use compressed oops with heap base + encoding. 678 679 // 4Gb 680 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); 681 // 32Gb 682 // OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes; 683 684 char* Universe::preferred_heap_base(size_t heap_size, size_t alignment, NARROW_OOP_MODE mode) { 685 assert(is_size_aligned((size_t)OopEncodingHeapMax, alignment), "Must be"); 686 assert(is_size_aligned((size_t)NarrowOopHeapMax, alignment), "Must be"); 687 assert(is_size_aligned(heap_size, alignment), "Must be"); 688 689 uintx heap_base_min_address_aligned = align_size_up(HeapBaseMinAddress, alignment); 690 691 size_t base = 0; 692 #ifdef _LP64 693 if (UseCompressedOops) { 694 assert(mode == UnscaledNarrowOop || 695 mode == ZeroBasedNarrowOop || 696 mode == HeapBasedNarrowOop, "mode is invalid"); 697 const size_t total_size = heap_size + heap_base_min_address_aligned; 698 // Return specified base for the first request. 699 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { 700 base = heap_base_min_address_aligned; 701 702 // If the total size is small enough to allow UnscaledNarrowOop then 703 // just use UnscaledNarrowOop. 704 } else if ((total_size <= OopEncodingHeapMax) && (mode != HeapBasedNarrowOop)) { 705 if ((total_size <= NarrowOopHeapMax) && (mode == UnscaledNarrowOop) && 706 (Universe::narrow_oop_shift() == 0)) { 707 // Use 32-bits oops without encoding and 708 // place heap's top on the 4Gb boundary 709 base = (NarrowOopHeapMax - heap_size); 710 } else { 711 // Can't reserve with NarrowOopShift == 0 712 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 713 if (mode == UnscaledNarrowOop || 714 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { 715 // Use zero based compressed oops with encoding and 716 // place heap's top on the 32Gb boundary in case 717 // total_size > 4Gb or failed to reserve below 4Gb. 718 base = (OopEncodingHeapMax - heap_size); 719 } 720 } 721 } else { 722 // UnscaledNarrowOop encoding didn't work, and no base was found for ZeroBasedOops or 723 // HeapBasedNarrowOop encoding was requested. So, can't reserve below 32Gb. 724 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 725 } 726 727 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks 728 // used in ReservedHeapSpace() constructors. 729 // The final values will be set in initialize_heap() below. 730 if ((base != 0) && ((base + heap_size) <= OopEncodingHeapMax)) { 731 // Use zero based compressed oops 732 Universe::set_narrow_oop_base(NULL); 733 // Don't need guard page for implicit checks in indexed 734 // addressing mode with zero based Compressed Oops. 735 Universe::set_narrow_oop_use_implicit_null_checks(true); 736 } else { 737 // Set to a non-NULL value so the ReservedSpace ctor computes 738 // the correct no-access prefix. 739 // The final value will be set in initialize_heap() below. 740 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); 741 #ifdef _WIN64 742 if (UseLargePages) { 743 // Cannot allocate guard pages for implicit checks in indexed 744 // addressing mode when large pages are specified on windows. 745 Universe::set_narrow_oop_use_implicit_null_checks(false); 746 } 747 #endif // _WIN64 748 } 749 } 750 #endif 751 752 assert(is_ptr_aligned((char*)base, alignment), "Must be"); 753 return (char*)base; // also return NULL (don't care) for 32-bit VM 754 } 755 756 jint Universe::initialize_heap() { 757 758 if (UseParallelGC) { 759 #if INCLUDE_ALL_GCS 760 Universe::_collectedHeap = new ParallelScavengeHeap(); 761 #else // INCLUDE_ALL_GCS 762 fatal("UseParallelGC not supported in this VM."); 763 #endif // INCLUDE_ALL_GCS 764 765 } else if (UseG1GC) { 766 #if INCLUDE_ALL_GCS 767 G1CollectorPolicy* g1p = new G1CollectorPolicy(); 768 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); 769 Universe::_collectedHeap = g1h; 770 #else // INCLUDE_ALL_GCS 771 fatal("UseG1GC not supported in java kernel vm."); 772 #endif // INCLUDE_ALL_GCS 773 774 } else { 775 GenCollectorPolicy *gc_policy; 776 777 if (UseSerialGC) { 778 gc_policy = new MarkSweepPolicy(); 779 } else if (UseConcMarkSweepGC) { 780 #if INCLUDE_ALL_GCS 781 if (UseAdaptiveSizePolicy) { 782 gc_policy = new ASConcurrentMarkSweepPolicy(); 783 } else { 784 gc_policy = new ConcurrentMarkSweepPolicy(); 785 } 786 #else // INCLUDE_ALL_GCS 787 fatal("UseConcMarkSweepGC not supported in this VM."); 788 #endif // INCLUDE_ALL_GCS 789 } else { // default old generation 790 gc_policy = new MarkSweepPolicy(); 791 } 792 793 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); 794 } 795 796 jint status = Universe::heap()->initialize(); 797 if (status != JNI_OK) { 798 return status; 799 } 800 801 #ifdef _LP64 802 if (UseCompressedOops) { 803 // Subtract a page because something can get allocated at heap base. 804 // This also makes implicit null checking work, because the 805 // memory+1 page below heap_base needs to cause a signal. 806 // See needs_explicit_null_check. 807 // Only set the heap base for compressed oops because it indicates 808 // compressed oops for pstack code. 809 bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose); 810 if (verbose) { 811 tty->cr(); 812 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 813 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); 814 } 815 if (((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax)) { 816 // Can't reserve heap below 32Gb. 817 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap() 818 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 819 if (verbose) { 820 tty->print(", %s: "PTR_FORMAT, 821 narrow_oop_mode_to_string(HeapBasedNarrowOop), 822 Universe::narrow_oop_base()); 823 } 824 } else { 825 Universe::set_narrow_oop_base(0); 826 if (verbose) { 827 tty->print(", %s", narrow_oop_mode_to_string(ZeroBasedNarrowOop)); 828 } 829 #ifdef _WIN64 830 if (!Universe::narrow_oop_use_implicit_null_checks()) { 831 // Don't need guard page for implicit checks in indexed addressing 832 // mode with zero based Compressed Oops. 833 Universe::set_narrow_oop_use_implicit_null_checks(true); 834 } 835 #endif // _WIN64 836 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { 837 // Can't reserve heap below 4Gb. 838 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 839 } else { 840 Universe::set_narrow_oop_shift(0); 841 if (verbose) { 842 tty->print(", %s", narrow_oop_mode_to_string(UnscaledNarrowOop)); 843 } 844 } 845 } 846 847 if (verbose) { 848 tty->cr(); 849 tty->cr(); 850 } 851 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 852 } 853 // Universe::narrow_oop_base() is one page below the heap. 854 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 855 os::vm_page_size()) || 856 Universe::narrow_oop_base() == NULL, "invalid value"); 857 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 858 Universe::narrow_oop_shift() == 0, "invalid value"); 859 #endif 860 861 // We will never reach the CATCH below since Exceptions::_throw will cause 862 // the VM to exit if an exception is thrown during initialization 863 864 if (UseTLAB) { 865 assert(Universe::heap()->supports_tlab_allocation(), 866 "Should support thread-local allocation buffers"); 867 ThreadLocalAllocBuffer::startup_initialization(); 868 } 869 return JNI_OK; 870 } 871 872 873 // Reserve the Java heap, which is now the same for all GCs. 874 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 875 assert(alignment <= Arguments::conservative_max_heap_alignment(), 876 err_msg("actual alignment "SIZE_FORMAT" must be within maximum heap alignment "SIZE_FORMAT, 877 alignment, Arguments::conservative_max_heap_alignment())); 878 size_t total_reserved = align_size_up(heap_size, alignment); 879 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 880 "heap size is too big for compressed oops"); 881 882 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size()); 883 assert(!UseLargePages 884 || UseParallelGC 885 || use_large_pages, "Wrong alignment to use large pages"); 886 887 char* addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::UnscaledNarrowOop); 888 889 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, addr); 890 891 if (UseCompressedOops) { 892 if (addr != NULL && !total_rs.is_reserved()) { 893 // Failed to reserve at specified address - the requested memory 894 // region is taken already, for example, by 'java' launcher. 895 // Try again to reserver heap higher. 896 addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::ZeroBasedNarrowOop); 897 898 ReservedHeapSpace total_rs0(total_reserved, alignment, 899 use_large_pages, addr); 900 901 if (addr != NULL && !total_rs0.is_reserved()) { 902 // Failed to reserve at specified address again - give up. 903 addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::HeapBasedNarrowOop); 904 assert(addr == NULL, ""); 905 906 ReservedHeapSpace total_rs1(total_reserved, alignment, 907 use_large_pages, addr); 908 total_rs = total_rs1; 909 } else { 910 total_rs = total_rs0; 911 } 912 } 913 } 914 915 if (!total_rs.is_reserved()) { 916 vm_exit_during_initialization(err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", total_reserved/K)); 917 return total_rs; 918 } 919 920 if (UseCompressedOops) { 921 // Universe::initialize_heap() will reset this to NULL if unscaled 922 // or zero-based narrow oops are actually used. 923 address base = (address)(total_rs.base() - os::vm_page_size()); 924 Universe::set_narrow_oop_base(base); 925 } 926 return total_rs; 927 } 928 929 930 // It's the caller's responsibility to ensure glitch-freedom 931 // (if required). 932 void Universe::update_heap_info_at_gc() { 933 _heap_capacity_at_last_gc = heap()->capacity(); 934 _heap_used_at_last_gc = heap()->used(); 935 } 936 937 938 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 939 switch (mode) { 940 case UnscaledNarrowOop: 941 return "32-bits Oops"; 942 case ZeroBasedNarrowOop: 943 return "zero based Compressed Oops"; 944 case HeapBasedNarrowOop: 945 return "Compressed Oops with base"; 946 } 947 948 ShouldNotReachHere(); 949 return ""; 950 } 951 952 953 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 954 if (narrow_oop_base() != 0) { 955 return HeapBasedNarrowOop; 956 } 957 958 if (narrow_oop_shift() != 0) { 959 return ZeroBasedNarrowOop; 960 } 961 962 return UnscaledNarrowOop; 963 } 964 965 966 void universe2_init() { 967 EXCEPTION_MARK; 968 Universe::genesis(CATCH); 969 } 970 971 972 // This function is defined in JVM.cpp 973 extern void initialize_converter_functions(); 974 975 bool universe_post_init() { 976 assert(!is_init_completed(), "Error: initialization not yet completed!"); 977 Universe::_fully_initialized = true; 978 EXCEPTION_MARK; 979 { ResourceMark rm; 980 Interpreter::initialize(); // needed for interpreter entry points 981 if (!UseSharedSpaces) { 982 HandleMark hm(THREAD); 983 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 984 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 985 Universe::reinitialize_itables(CHECK_false); 986 } 987 } 988 989 HandleMark hm(THREAD); 990 Klass* k; 991 instanceKlassHandle k_h; 992 // Setup preallocated empty java.lang.Class array 993 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 994 995 // Setup preallocated OutOfMemoryError errors 996 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 997 k_h = instanceKlassHandle(THREAD, k); 998 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 999 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); 1000 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); 1001 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 1002 Universe::_out_of_memory_error_gc_overhead_limit = 1003 k_h->allocate_instance(CHECK_false); 1004 1005 // Setup preallocated NullPointerException 1006 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1007 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1008 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1009 // Setup preallocated ArithmeticException 1010 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1011 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1012 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1013 // Virtual Machine Error for when we get into a situation we can't resolve 1014 k = SystemDictionary::resolve_or_fail( 1015 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1016 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1017 if (!linked) { 1018 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1019 return false; // initialization failed 1020 } 1021 Universe::_virtual_machine_error_instance = 1022 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1023 1024 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1025 1026 if (!DumpSharedSpaces) { 1027 // These are the only Java fields that are currently set during shared space dumping. 1028 // We prefer to not handle this generally, so we always reinitialize these detail messages. 1029 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1030 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1031 1032 msg = java_lang_String::create_from_str("Metadata space", CHECK_false); 1033 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1034 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 1035 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1036 1037 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1038 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1039 1040 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1041 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1042 1043 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1044 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1045 1046 // Setup the array of errors that have preallocated backtrace 1047 k = Universe::_out_of_memory_error_java_heap->klass(); 1048 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1049 k_h = instanceKlassHandle(THREAD, k); 1050 1051 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1052 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 1053 for (int i=0; i<len; i++) { 1054 oop err = k_h->allocate_instance(CHECK_false); 1055 Handle err_h = Handle(THREAD, err); 1056 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1057 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1058 } 1059 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1060 } 1061 1062 1063 // Setup static method for registering finalizers 1064 // The finalizer klass must be linked before looking up the method, in 1065 // case it needs to get rewritten. 1066 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); 1067 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( 1068 vmSymbols::register_method_name(), 1069 vmSymbols::register_method_signature()); 1070 if (m == NULL || !m->is_static()) { 1071 tty->print_cr("Unable to link/verify Finalizer.register method"); 1072 return false; // initialization failed (cannot throw exception yet) 1073 } 1074 Universe::_finalizer_register_cache->init( 1075 SystemDictionary::Finalizer_klass(), m); 1076 1077 // Setup method for registering loaded classes in class loader vector 1078 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); 1079 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1080 if (m == NULL || m->is_static()) { 1081 tty->print_cr("Unable to link/verify ClassLoader.addClass method"); 1082 return false; // initialization failed (cannot throw exception yet) 1083 } 1084 Universe::_loader_addClass_cache->init( 1085 SystemDictionary::ClassLoader_klass(), m); 1086 1087 // Setup method for checking protection domain 1088 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false); 1089 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())-> 1090 find_method(vmSymbols::impliesCreateAccessControlContext_name(), 1091 vmSymbols::void_boolean_signature()); 1092 // Allow NULL which should only happen with bootstrapping. 1093 if (m != NULL) { 1094 if (m->is_static()) { 1095 // NoSuchMethodException doesn't actually work because it tries to run the 1096 // <init> function before java_lang_Class is linked. Print error and exit. 1097 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); 1098 return false; // initialization failed 1099 } 1100 Universe::_pd_implies_cache->init( 1101 SystemDictionary::ProtectionDomain_klass(), m);; 1102 } 1103 1104 // The folowing is initializing converter functions for serialization in 1105 // JVM.cpp. If we clean up the StrictMath code above we may want to find 1106 // a better solution for this as well. 1107 initialize_converter_functions(); 1108 1109 // This needs to be done before the first scavenge/gc, since 1110 // it's an input to soft ref clearing policy. 1111 { 1112 MutexLocker x(Heap_lock); 1113 Universe::update_heap_info_at_gc(); 1114 } 1115 1116 // ("weak") refs processing infrastructure initialization 1117 Universe::heap()->post_initialize(); 1118 1119 // Initialize performance counters for metaspaces 1120 MetaspaceCounters::initialize_performance_counters(); 1121 CompressedClassSpaceCounters::initialize_performance_counters(); 1122 1123 MemoryService::add_metaspace_memory_pools(); 1124 1125 GC_locker::unlock(); // allow gc after bootstrapping 1126 1127 MemoryService::set_universe_heap(Universe::_collectedHeap); 1128 return true; 1129 } 1130 1131 1132 void Universe::compute_base_vtable_size() { 1133 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1134 } 1135 1136 1137 // %%% The Universe::flush_foo methods belong in CodeCache. 1138 1139 // Flushes compiled methods dependent on dependee. 1140 void Universe::flush_dependents_on(instanceKlassHandle dependee) { 1141 assert_lock_strong(Compile_lock); 1142 1143 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1144 1145 // CodeCache can only be updated by a thread_in_VM and they will all be 1146 // stopped dring the safepoint so CodeCache will be safe to update without 1147 // holding the CodeCache_lock. 1148 1149 KlassDepChange changes(dependee); 1150 1151 // Compute the dependent nmethods 1152 if (CodeCache::mark_for_deoptimization(changes) > 0) { 1153 // At least one nmethod has been marked for deoptimization 1154 VM_Deoptimize op; 1155 VMThread::execute(&op); 1156 } 1157 } 1158 1159 // Flushes compiled methods dependent on a particular CallSite 1160 // instance when its target is different than the given MethodHandle. 1161 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) { 1162 assert_lock_strong(Compile_lock); 1163 1164 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1165 1166 // CodeCache can only be updated by a thread_in_VM and they will all be 1167 // stopped dring the safepoint so CodeCache will be safe to update without 1168 // holding the CodeCache_lock. 1169 1170 CallSiteDepChange changes(call_site(), method_handle()); 1171 1172 // Compute the dependent nmethods that have a reference to a 1173 // CallSite object. We use InstanceKlass::mark_dependent_nmethod 1174 // directly instead of CodeCache::mark_for_deoptimization because we 1175 // want dependents on the call site class only not all classes in 1176 // the ContextStream. 1177 int marked = 0; 1178 { 1179 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1180 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass()); 1181 marked = call_site_klass->mark_dependent_nmethods(changes); 1182 } 1183 if (marked > 0) { 1184 // At least one nmethod has been marked for deoptimization 1185 VM_Deoptimize op; 1186 VMThread::execute(&op); 1187 } 1188 } 1189 1190 #ifdef HOTSWAP 1191 // Flushes compiled methods dependent on dependee in the evolutionary sense 1192 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { 1193 // --- Compile_lock is not held. However we are at a safepoint. 1194 assert_locked_or_safepoint(Compile_lock); 1195 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1196 1197 // CodeCache can only be updated by a thread_in_VM and they will all be 1198 // stopped dring the safepoint so CodeCache will be safe to update without 1199 // holding the CodeCache_lock. 1200 1201 // Compute the dependent nmethods 1202 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { 1203 // At least one nmethod has been marked for deoptimization 1204 1205 // All this already happens inside a VM_Operation, so we'll do all the work here. 1206 // Stuff copied from VM_Deoptimize and modified slightly. 1207 1208 // We do not want any GCs to happen while we are in the middle of this VM operation 1209 ResourceMark rm; 1210 DeoptimizationMarker dm; 1211 1212 // Deoptimize all activations depending on marked nmethods 1213 Deoptimization::deoptimize_dependents(); 1214 1215 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1216 CodeCache::make_marked_nmethods_not_entrant(); 1217 } 1218 } 1219 #endif // HOTSWAP 1220 1221 1222 // Flushes compiled methods dependent on dependee 1223 void Universe::flush_dependents_on_method(methodHandle m_h) { 1224 // --- Compile_lock is not held. However we are at a safepoint. 1225 assert_locked_or_safepoint(Compile_lock); 1226 1227 // CodeCache can only be updated by a thread_in_VM and they will all be 1228 // stopped dring the safepoint so CodeCache will be safe to update without 1229 // holding the CodeCache_lock. 1230 1231 // Compute the dependent nmethods 1232 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { 1233 // At least one nmethod has been marked for deoptimization 1234 1235 // All this already happens inside a VM_Operation, so we'll do all the work here. 1236 // Stuff copied from VM_Deoptimize and modified slightly. 1237 1238 // We do not want any GCs to happen while we are in the middle of this VM operation 1239 ResourceMark rm; 1240 DeoptimizationMarker dm; 1241 1242 // Deoptimize all activations depending on marked nmethods 1243 Deoptimization::deoptimize_dependents(); 1244 1245 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1246 CodeCache::make_marked_nmethods_not_entrant(); 1247 } 1248 } 1249 1250 void Universe::print() { 1251 print_on(gclog_or_tty); 1252 } 1253 1254 void Universe::print_on(outputStream* st, bool extended) { 1255 st->print_cr("Heap"); 1256 if (!extended) { 1257 heap()->print_on(st); 1258 } else { 1259 heap()->print_extended_on(st); 1260 } 1261 } 1262 1263 void Universe::print_heap_at_SIGBREAK() { 1264 if (PrintHeapAtSIGBREAK) { 1265 MutexLocker hl(Heap_lock); 1266 print_on(tty); 1267 tty->cr(); 1268 tty->flush(); 1269 } 1270 } 1271 1272 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1273 st->print_cr("{Heap before GC invocations=%u (full %u):", 1274 heap()->total_collections(), 1275 heap()->total_full_collections()); 1276 if (!PrintHeapAtGCExtended || ignore_extended) { 1277 heap()->print_on(st); 1278 } else { 1279 heap()->print_extended_on(st); 1280 } 1281 } 1282 1283 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1284 st->print_cr("Heap after GC invocations=%u (full %u):", 1285 heap()->total_collections(), 1286 heap()->total_full_collections()); 1287 if (!PrintHeapAtGCExtended || ignore_extended) { 1288 heap()->print_on(st); 1289 } else { 1290 heap()->print_extended_on(st); 1291 } 1292 st->print_cr("}"); 1293 } 1294 1295 void Universe::verify(VerifyOption option, const char* prefix, bool silent) { 1296 // The use of _verify_in_progress is a temporary work around for 1297 // 6320749. Don't bother with a creating a class to set and clear 1298 // it since it is only used in this method and the control flow is 1299 // straight forward. 1300 _verify_in_progress = true; 1301 1302 COMPILER2_PRESENT( 1303 assert(!DerivedPointerTable::is_active(), 1304 "DPT should not be active during verification " 1305 "(of thread stacks below)"); 1306 ) 1307 1308 ResourceMark rm; 1309 HandleMark hm; // Handles created during verification can be zapped 1310 _verify_count++; 1311 1312 if (!silent) gclog_or_tty->print(prefix); 1313 if (!silent) gclog_or_tty->print("[Verifying "); 1314 if (!silent) gclog_or_tty->print("threads "); 1315 Threads::verify(); 1316 if (!silent) gclog_or_tty->print("heap "); 1317 heap()->verify(silent, option); 1318 if (!silent) gclog_or_tty->print("syms "); 1319 SymbolTable::verify(); 1320 if (!silent) gclog_or_tty->print("strs "); 1321 StringTable::verify(); 1322 { 1323 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1324 if (!silent) gclog_or_tty->print("zone "); 1325 CodeCache::verify(); 1326 } 1327 if (!silent) gclog_or_tty->print("dict "); 1328 SystemDictionary::verify(); 1329 #ifndef PRODUCT 1330 if (!silent) gclog_or_tty->print("cldg "); 1331 ClassLoaderDataGraph::verify(); 1332 #endif 1333 if (!silent) gclog_or_tty->print("metaspace chunks "); 1334 MetaspaceAux::verify_free_chunks(); 1335 if (!silent) gclog_or_tty->print("hand "); 1336 JNIHandles::verify(); 1337 if (!silent) gclog_or_tty->print("C-heap "); 1338 os::check_heap(); 1339 if (!silent) gclog_or_tty->print("code cache "); 1340 CodeCache::verify_oops(); 1341 if (!silent) gclog_or_tty->print_cr("]"); 1342 1343 _verify_in_progress = false; 1344 } 1345 1346 // Oop verification (see MacroAssembler::verify_oop) 1347 1348 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; 1349 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; 1350 1351 1352 #ifndef PRODUCT 1353 1354 static void calculate_verify_data(uintptr_t verify_data[2], 1355 HeapWord* low_boundary, 1356 HeapWord* high_boundary) { 1357 assert(low_boundary < high_boundary, "bad interval"); 1358 1359 // decide which low-order bits we require to be clear: 1360 size_t alignSize = MinObjAlignmentInBytes; 1361 size_t min_object_size = CollectedHeap::min_fill_size(); 1362 1363 // make an inclusive limit: 1364 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1365 uintptr_t min = (uintptr_t)low_boundary; 1366 assert(min < max, "bad interval"); 1367 uintptr_t diff = max ^ min; 1368 1369 // throw away enough low-order bits to make the diff vanish 1370 uintptr_t mask = (uintptr_t)(-1); 1371 while ((mask & diff) != 0) 1372 mask <<= 1; 1373 uintptr_t bits = (min & mask); 1374 assert(bits == (max & mask), "correct mask"); 1375 // check an intermediate value between min and max, just to make sure: 1376 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1377 1378 // require address alignment, too: 1379 mask |= (alignSize - 1); 1380 1381 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { 1382 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); 1383 } 1384 verify_data[0] = mask; 1385 verify_data[1] = bits; 1386 } 1387 1388 // Oop verification (see MacroAssembler::verify_oop) 1389 1390 uintptr_t Universe::verify_oop_mask() { 1391 MemRegion m = heap()->reserved_region(); 1392 calculate_verify_data(_verify_oop_data, 1393 m.start(), 1394 m.end()); 1395 return _verify_oop_data[0]; 1396 } 1397 1398 1399 1400 uintptr_t Universe::verify_oop_bits() { 1401 verify_oop_mask(); 1402 return _verify_oop_data[1]; 1403 } 1404 1405 uintptr_t Universe::verify_mark_mask() { 1406 return markOopDesc::lock_mask_in_place; 1407 } 1408 1409 uintptr_t Universe::verify_mark_bits() { 1410 intptr_t mask = verify_mark_mask(); 1411 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1412 assert((bits & ~mask) == 0, "no stray header bits"); 1413 return bits; 1414 } 1415 #endif // PRODUCT 1416 1417 1418 void Universe::compute_verify_oop_data() { 1419 verify_oop_mask(); 1420 verify_oop_bits(); 1421 verify_mark_mask(); 1422 verify_mark_bits(); 1423 } 1424 1425 1426 void LatestMethodCache::init(Klass* k, Method* m) { 1427 if (!UseSharedSpaces) { 1428 _klass = k; 1429 } 1430 #ifndef PRODUCT 1431 else { 1432 // sharing initilization should have already set up _klass 1433 assert(_klass != NULL, "just checking"); 1434 } 1435 #endif 1436 1437 _method_idnum = m->method_idnum(); 1438 assert(_method_idnum >= 0, "sanity check"); 1439 } 1440 1441 1442 Method* LatestMethodCache::get_method() { 1443 if (klass() == NULL) return NULL; 1444 InstanceKlass* ik = InstanceKlass::cast(klass()); 1445 Method* m = ik->method_with_idnum(method_idnum()); 1446 assert(m != NULL, "sanity check"); 1447 return m; 1448 } 1449 1450 1451 #ifdef ASSERT 1452 // Release dummy object(s) at bottom of heap 1453 bool Universe::release_fullgc_alot_dummy() { 1454 MutexLocker ml(FullGCALot_lock); 1455 if (_fullgc_alot_dummy_array != NULL) { 1456 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1457 // No more dummies to release, release entire array instead 1458 _fullgc_alot_dummy_array = NULL; 1459 return false; 1460 } 1461 if (!UseConcMarkSweepGC) { 1462 // Release dummy at bottom of old generation 1463 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1464 } 1465 // Release dummy at bottom of permanent generation 1466 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1467 } 1468 return true; 1469 } 1470 1471 #endif // ASSERT