1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/classLoaderData.hpp" 28 #include "classfile/javaClasses.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "code/codeCache.hpp" 33 #include "code/dependencies.hpp" 34 #include "gc_interface/collectedHeap.inline.hpp" 35 #include "interpreter/interpreter.hpp" 36 #include "memory/cardTableModRefBS.hpp" 37 #include "memory/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/atomic.inline.hpp" 57 #include "runtime/deoptimization.hpp" 58 #include "runtime/fprofiler.hpp" 59 #include "runtime/handles.inline.hpp" 60 #include "runtime/init.hpp" 61 #include "runtime/java.hpp" 62 #include "runtime/javaCalls.hpp" 63 #include "runtime/sharedRuntime.hpp" 64 #include "runtime/synchronizer.hpp" 65 #include "runtime/thread.inline.hpp" 66 #include "runtime/timer.hpp" 67 #include "runtime/vm_operations.hpp" 68 #include "services/memoryService.hpp" 69 #include "utilities/copy.hpp" 70 #include "utilities/events.hpp" 71 #include "utilities/hashtable.inline.hpp" 72 #include "utilities/preserveException.hpp" 73 #include "utilities/macros.hpp" 74 #if INCLUDE_ALL_GCS 75 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" 76 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp" 77 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 78 #include "gc_implementation/g1/g1CollectorPolicy.hpp" 79 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 80 #endif // INCLUDE_ALL_GCS 81 82 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 83 84 // Known objects 85 Klass* Universe::_boolArrayKlassObj = NULL; 86 Klass* Universe::_byteArrayKlassObj = NULL; 87 Klass* Universe::_charArrayKlassObj = NULL; 88 Klass* Universe::_intArrayKlassObj = NULL; 89 Klass* Universe::_shortArrayKlassObj = NULL; 90 Klass* Universe::_longArrayKlassObj = NULL; 91 Klass* Universe::_singleArrayKlassObj = NULL; 92 Klass* Universe::_doubleArrayKlassObj = NULL; 93 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 94 Klass* Universe::_objectArrayKlassObj = NULL; 95 oop Universe::_int_mirror = NULL; 96 oop Universe::_float_mirror = NULL; 97 oop Universe::_double_mirror = NULL; 98 oop Universe::_byte_mirror = NULL; 99 oop Universe::_bool_mirror = NULL; 100 oop Universe::_char_mirror = NULL; 101 oop Universe::_long_mirror = NULL; 102 oop Universe::_short_mirror = NULL; 103 oop Universe::_void_mirror = NULL; 104 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 105 oop Universe::_main_thread_group = NULL; 106 oop Universe::_system_thread_group = NULL; 107 objArrayOop Universe::_the_empty_class_klass_array = NULL; 108 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 109 oop Universe::_the_null_string = NULL; 110 oop Universe::_the_min_jint_string = NULL; 111 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 112 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 113 LatestMethodCache* Universe::_pd_implies_cache = NULL; 114 oop Universe::_out_of_memory_error_java_heap = NULL; 115 oop Universe::_out_of_memory_error_metaspace = NULL; 116 oop Universe::_out_of_memory_error_class_metaspace = NULL; 117 oop Universe::_out_of_memory_error_array_size = NULL; 118 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 119 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 120 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 121 bool Universe::_verify_in_progress = false; 122 oop Universe::_null_ptr_exception_instance = NULL; 123 oop Universe::_arithmetic_exception_instance = NULL; 124 oop Universe::_virtual_machine_error_instance = NULL; 125 oop Universe::_vm_exception = NULL; 126 Method* Universe::_throw_illegal_access_error = NULL; 127 Array<int>* Universe::_the_empty_int_array = NULL; 128 Array<u2>* Universe::_the_empty_short_array = NULL; 129 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 130 Array<Method*>* Universe::_the_empty_method_array = NULL; 131 132 // These variables are guarded by FullGCALot_lock. 133 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 134 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 135 136 // Heap 137 int Universe::_verify_count = 0; 138 139 int Universe::_base_vtable_size = 0; 140 bool Universe::_bootstrapping = false; 141 bool Universe::_fully_initialized = false; 142 143 size_t Universe::_heap_capacity_at_last_gc; 144 size_t Universe::_heap_used_at_last_gc = 0; 145 146 CollectedHeap* Universe::_collectedHeap = NULL; 147 148 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 149 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 150 address Universe::_narrow_ptrs_base; 151 152 void Universe::basic_type_classes_do(void f(Klass*)) { 153 f(boolArrayKlassObj()); 154 f(byteArrayKlassObj()); 155 f(charArrayKlassObj()); 156 f(intArrayKlassObj()); 157 f(shortArrayKlassObj()); 158 f(longArrayKlassObj()); 159 f(singleArrayKlassObj()); 160 f(doubleArrayKlassObj()); 161 } 162 163 void Universe::oops_do(OopClosure* f, bool do_all) { 164 165 f->do_oop((oop*) &_int_mirror); 166 f->do_oop((oop*) &_float_mirror); 167 f->do_oop((oop*) &_double_mirror); 168 f->do_oop((oop*) &_byte_mirror); 169 f->do_oop((oop*) &_bool_mirror); 170 f->do_oop((oop*) &_char_mirror); 171 f->do_oop((oop*) &_long_mirror); 172 f->do_oop((oop*) &_short_mirror); 173 f->do_oop((oop*) &_void_mirror); 174 175 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 176 f->do_oop((oop*) &_mirrors[i]); 177 } 178 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 179 180 f->do_oop((oop*)&_the_empty_class_klass_array); 181 f->do_oop((oop*)&_the_null_string); 182 f->do_oop((oop*)&_the_min_jint_string); 183 f->do_oop((oop*)&_out_of_memory_error_java_heap); 184 f->do_oop((oop*)&_out_of_memory_error_metaspace); 185 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 186 f->do_oop((oop*)&_out_of_memory_error_array_size); 187 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 188 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 189 f->do_oop((oop*)&_null_ptr_exception_instance); 190 f->do_oop((oop*)&_arithmetic_exception_instance); 191 f->do_oop((oop*)&_virtual_machine_error_instance); 192 f->do_oop((oop*)&_main_thread_group); 193 f->do_oop((oop*)&_system_thread_group); 194 f->do_oop((oop*)&_vm_exception); 195 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 196 } 197 198 // Serialize metadata in and out of CDS archive, not oops. 199 void Universe::serialize(SerializeClosure* f, bool do_all) { 200 201 f->do_ptr((void**)&_boolArrayKlassObj); 202 f->do_ptr((void**)&_byteArrayKlassObj); 203 f->do_ptr((void**)&_charArrayKlassObj); 204 f->do_ptr((void**)&_intArrayKlassObj); 205 f->do_ptr((void**)&_shortArrayKlassObj); 206 f->do_ptr((void**)&_longArrayKlassObj); 207 f->do_ptr((void**)&_singleArrayKlassObj); 208 f->do_ptr((void**)&_doubleArrayKlassObj); 209 f->do_ptr((void**)&_objectArrayKlassObj); 210 211 { 212 for (int i = 0; i < T_VOID+1; i++) { 213 if (_typeArrayKlassObjs[i] != NULL) { 214 assert(i >= T_BOOLEAN, "checking"); 215 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 216 } else if (do_all) { 217 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 218 } 219 } 220 } 221 222 f->do_ptr((void**)&_the_array_interfaces_array); 223 f->do_ptr((void**)&_the_empty_int_array); 224 f->do_ptr((void**)&_the_empty_short_array); 225 f->do_ptr((void**)&_the_empty_method_array); 226 f->do_ptr((void**)&_the_empty_klass_array); 227 _finalizer_register_cache->serialize(f); 228 _loader_addClass_cache->serialize(f); 229 _pd_implies_cache->serialize(f); 230 } 231 232 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 233 if (size < alignment || size % alignment != 0) { 234 vm_exit_during_initialization( 235 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 236 } 237 } 238 239 void initialize_basic_type_klass(Klass* k, TRAPS) { 240 Klass* ok = SystemDictionary::Object_klass(); 241 if (UseSharedSpaces) { 242 assert(k->super() == ok, "u3"); 243 k->restore_unshareable_info(CHECK); 244 } else { 245 k->initialize_supers(ok, CHECK); 246 } 247 k->append_to_sibling_list(); 248 } 249 250 void Universe::genesis(TRAPS) { 251 ResourceMark rm; 252 253 { FlagSetting fs(_bootstrapping, true); 254 255 { MutexLocker mc(Compile_lock); 256 257 // determine base vtable size; without that we cannot create the array klasses 258 compute_base_vtable_size(); 259 260 if (!UseSharedSpaces) { 261 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 262 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 263 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 264 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 265 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 266 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 267 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 268 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 269 270 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 271 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 272 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 273 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 274 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 275 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 276 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 277 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 278 279 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 280 281 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 282 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 283 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 284 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 285 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 286 } 287 } 288 289 vmSymbols::initialize(CHECK); 290 291 SystemDictionary::initialize(CHECK); 292 293 Klass* ok = SystemDictionary::Object_klass(); 294 295 _the_null_string = StringTable::intern("null", CHECK); 296 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 297 298 if (UseSharedSpaces) { 299 // Verify shared interfaces array. 300 assert(_the_array_interfaces_array->at(0) == 301 SystemDictionary::Cloneable_klass(), "u3"); 302 assert(_the_array_interfaces_array->at(1) == 303 SystemDictionary::Serializable_klass(), "u3"); 304 } else { 305 // Set up shared interfaces array. (Do this before supers are set up.) 306 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 307 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 308 } 309 310 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 311 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 312 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 313 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 314 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 315 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 316 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 317 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 318 } // end of core bootstrapping 319 320 // Maybe this could be lifted up now that object array can be initialized 321 // during the bootstrapping. 322 323 // OLD 324 // Initialize _objectArrayKlass after core bootstraping to make 325 // sure the super class is set up properly for _objectArrayKlass. 326 // --- 327 // NEW 328 // Since some of the old system object arrays have been converted to 329 // ordinary object arrays, _objectArrayKlass will be loaded when 330 // SystemDictionary::initialize(CHECK); is run. See the extra check 331 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 332 _objectArrayKlassObj = InstanceKlass:: 333 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 334 // OLD 335 // Add the class to the class hierarchy manually to make sure that 336 // its vtable is initialized after core bootstrapping is completed. 337 // --- 338 // New 339 // Have already been initialized. 340 _objectArrayKlassObj->append_to_sibling_list(); 341 342 // Compute is_jdk version flags. 343 // Only 1.3 or later has the java.lang.Shutdown class. 344 // Only 1.4 or later has the java.lang.CharSequence interface. 345 // Only 1.5 or later has the java.lang.management.MemoryUsage class. 346 if (JDK_Version::is_partially_initialized()) { 347 uint8_t jdk_version; 348 Klass* k = SystemDictionary::resolve_or_null( 349 vmSymbols::java_lang_management_MemoryUsage(), THREAD); 350 CLEAR_PENDING_EXCEPTION; // ignore exceptions 351 if (k == NULL) { 352 k = SystemDictionary::resolve_or_null( 353 vmSymbols::java_lang_CharSequence(), THREAD); 354 CLEAR_PENDING_EXCEPTION; // ignore exceptions 355 if (k == NULL) { 356 k = SystemDictionary::resolve_or_null( 357 vmSymbols::java_lang_Shutdown(), THREAD); 358 CLEAR_PENDING_EXCEPTION; // ignore exceptions 359 if (k == NULL) { 360 jdk_version = 2; 361 } else { 362 jdk_version = 3; 363 } 364 } else { 365 jdk_version = 4; 366 } 367 } else { 368 jdk_version = 5; 369 } 370 JDK_Version::fully_initialize(jdk_version); 371 } 372 373 #ifdef ASSERT 374 if (FullGCALot) { 375 // Allocate an array of dummy objects. 376 // We'd like these to be at the bottom of the old generation, 377 // so that when we free one and then collect, 378 // (almost) the whole heap moves 379 // and we find out if we actually update all the oops correctly. 380 // But we can't allocate directly in the old generation, 381 // so we allocate wherever, and hope that the first collection 382 // moves these objects to the bottom of the old generation. 383 // We can allocate directly in the permanent generation, so we do. 384 int size; 385 if (UseConcMarkSweepGC) { 386 warning("Using +FullGCALot with concurrent mark sweep gc " 387 "will not force all objects to relocate"); 388 size = FullGCALotDummies; 389 } else { 390 size = FullGCALotDummies * 2; 391 } 392 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 393 objArrayHandle dummy_array(THREAD, naked_array); 394 int i = 0; 395 while (i < size) { 396 // Allocate dummy in old generation 397 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); 398 dummy_array->obj_at_put(i++, dummy); 399 } 400 { 401 // Only modify the global variable inside the mutex. 402 // If we had a race to here, the other dummy_array instances 403 // and their elements just get dropped on the floor, which is fine. 404 MutexLocker ml(FullGCALot_lock); 405 if (_fullgc_alot_dummy_array == NULL) { 406 _fullgc_alot_dummy_array = dummy_array(); 407 } 408 } 409 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 410 } 411 #endif 412 413 // Initialize dependency array for null class loader 414 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 415 416 } 417 418 // CDS support for patching vtables in metadata in the shared archive. 419 // All types inherited from Metadata have vtables, but not types inherited 420 // from MetaspaceObj, because the latter does not have virtual functions. 421 // If the metadata type has a vtable, it cannot be shared in the read-only 422 // section of the CDS archive, because the vtable pointer is patched. 423 static inline void add_vtable(void** list, int* n, void* o, int count) { 424 guarantee((*n) < count, "vtable list too small"); 425 void* vtable = dereference_vptr(o); 426 assert(*(void**)(vtable) != NULL, "invalid vtable"); 427 list[(*n)++] = vtable; 428 } 429 430 void Universe::init_self_patching_vtbl_list(void** list, int count) { 431 int n = 0; 432 { InstanceKlass o; add_vtable(list, &n, &o, count); } 433 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 434 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 435 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 436 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 437 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 438 { Method o; add_vtable(list, &n, &o, count); } 439 { ConstantPool o; add_vtable(list, &n, &o, count); } 440 } 441 442 void Universe::initialize_basic_type_mirrors(TRAPS) { 443 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 444 _int_mirror = 445 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 446 _float_mirror = 447 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 448 _double_mirror = 449 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 450 _byte_mirror = 451 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 452 _bool_mirror = 453 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 454 _char_mirror = 455 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 456 _long_mirror = 457 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 458 _short_mirror = 459 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 460 _void_mirror = 461 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 462 463 _mirrors[T_INT] = _int_mirror; 464 _mirrors[T_FLOAT] = _float_mirror; 465 _mirrors[T_DOUBLE] = _double_mirror; 466 _mirrors[T_BYTE] = _byte_mirror; 467 _mirrors[T_BOOLEAN] = _bool_mirror; 468 _mirrors[T_CHAR] = _char_mirror; 469 _mirrors[T_LONG] = _long_mirror; 470 _mirrors[T_SHORT] = _short_mirror; 471 _mirrors[T_VOID] = _void_mirror; 472 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); 473 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); 474 } 475 476 void Universe::fixup_mirrors(TRAPS) { 477 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 478 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 479 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 480 // that the number of objects allocated at this point is very small. 481 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 482 HandleMark hm(THREAD); 483 // Cache the start of the static fields 484 InstanceMirrorKlass::init_offset_of_static_fields(); 485 486 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 487 int list_length = list->length(); 488 for (int i = 0; i < list_length; i++) { 489 Klass* k = list->at(i); 490 assert(k->is_klass(), "List should only hold classes"); 491 EXCEPTION_MARK; 492 KlassHandle kh(THREAD, k); 493 java_lang_Class::fixup_mirror(kh, CATCH); 494 } 495 delete java_lang_Class::fixup_mirror_list(); 496 java_lang_Class::set_fixup_mirror_list(NULL); 497 } 498 499 static bool has_run_finalizers_on_exit = false; 500 501 void Universe::run_finalizers_on_exit() { 502 if (has_run_finalizers_on_exit) return; 503 has_run_finalizers_on_exit = true; 504 505 // Called on VM exit. This ought to be run in a separate thread. 506 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 507 { 508 PRESERVE_EXCEPTION_MARK; 509 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 510 JavaValue result(T_VOID); 511 JavaCalls::call_static( 512 &result, 513 finalizer_klass, 514 vmSymbols::run_finalizers_on_exit_name(), 515 vmSymbols::void_method_signature(), 516 THREAD 517 ); 518 // Ignore any pending exceptions 519 CLEAR_PENDING_EXCEPTION; 520 } 521 } 522 523 524 // initialize_vtable could cause gc if 525 // 1) we specified true to initialize_vtable and 526 // 2) this ran after gc was enabled 527 // In case those ever change we use handles for oops 528 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 529 // init vtable of k and all subclasses 530 Klass* ko = k_h(); 531 klassVtable* vt = ko->vtable(); 532 if (vt) vt->initialize_vtable(false, CHECK); 533 if (ko->oop_is_instance()) { 534 InstanceKlass* ik = (InstanceKlass*)ko; 535 for (KlassHandle s_h(THREAD, ik->subklass()); 536 s_h() != NULL; 537 s_h = KlassHandle(THREAD, s_h()->next_sibling())) { 538 reinitialize_vtable_of(s_h, CHECK); 539 } 540 } 541 } 542 543 544 void initialize_itable_for_klass(Klass* k, TRAPS) { 545 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 546 } 547 548 549 void Universe::reinitialize_itables(TRAPS) { 550 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 551 552 } 553 554 555 bool Universe::on_page_boundary(void* addr) { 556 return ((uintptr_t) addr) % os::vm_page_size() == 0; 557 } 558 559 560 bool Universe::should_fill_in_stack_trace(Handle throwable) { 561 // never attempt to fill in the stack trace of preallocated errors that do not have 562 // backtrace. These errors are kept alive forever and may be "re-used" when all 563 // preallocated errors with backtrace have been consumed. Also need to avoid 564 // a potential loop which could happen if an out of memory occurs when attempting 565 // to allocate the backtrace. 566 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 567 (throwable() != Universe::_out_of_memory_error_metaspace) && 568 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 569 (throwable() != Universe::_out_of_memory_error_array_size) && 570 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); 571 } 572 573 574 oop Universe::gen_out_of_memory_error(oop default_err) { 575 // generate an out of memory error: 576 // - if there is a preallocated error with backtrace available then return it wth 577 // a filled in stack trace. 578 // - if there are no preallocated errors with backtrace available then return 579 // an error without backtrace. 580 int next; 581 if (_preallocated_out_of_memory_error_avail_count > 0) { 582 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 583 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 584 } else { 585 next = -1; 586 } 587 if (next < 0) { 588 // all preallocated errors have been used. 589 // return default 590 return default_err; 591 } else { 592 // get the error object at the slot and set set it to NULL so that the 593 // array isn't keeping it alive anymore. 594 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 595 assert(exc != NULL, "slot has been used already"); 596 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 597 598 // use the message from the default error 599 oop msg = java_lang_Throwable::message(default_err); 600 assert(msg != NULL, "no message"); 601 java_lang_Throwable::set_message(exc, msg); 602 603 // populate the stack trace and return it. 604 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 605 return exc; 606 } 607 } 608 609 intptr_t Universe::_non_oop_bits = 0; 610 611 void* Universe::non_oop_word() { 612 // Neither the high bits nor the low bits of this value is allowed 613 // to look like (respectively) the high or low bits of a real oop. 614 // 615 // High and low are CPU-specific notions, but low always includes 616 // the low-order bit. Since oops are always aligned at least mod 4, 617 // setting the low-order bit will ensure that the low half of the 618 // word will never look like that of a real oop. 619 // 620 // Using the OS-supplied non-memory-address word (usually 0 or -1) 621 // will take care of the high bits, however many there are. 622 623 if (_non_oop_bits == 0) { 624 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 625 } 626 627 return (void*)_non_oop_bits; 628 } 629 630 jint universe_init() { 631 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 632 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 633 "LogHeapWordSize is incorrect."); 634 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 635 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 636 "oop size is not not a multiple of HeapWord size"); 637 TraceTime timer("Genesis", TraceStartupTime); 638 JavaClasses::compute_hard_coded_offsets(); 639 640 jint status = Universe::initialize_heap(); 641 if (status != JNI_OK) { 642 return status; 643 } 644 645 Metaspace::global_initialize(); 646 647 // Create memory for metadata. Must be after initializing heap for 648 // DumpSharedSpaces. 649 ClassLoaderData::init_null_class_loader_data(); 650 651 // We have a heap so create the Method* caches before 652 // Metaspace::initialize_shared_spaces() tries to populate them. 653 Universe::_finalizer_register_cache = new LatestMethodCache(); 654 Universe::_loader_addClass_cache = new LatestMethodCache(); 655 Universe::_pd_implies_cache = new LatestMethodCache(); 656 657 if (UseSharedSpaces) { 658 // Read the data structures supporting the shared spaces (shared 659 // system dictionary, symbol table, etc.). After that, access to 660 // the file (other than the mapped regions) is no longer needed, and 661 // the file is closed. Closing the file does not affect the 662 // currently mapped regions. 663 MetaspaceShared::initialize_shared_spaces(); 664 StringTable::create_table(); 665 } else { 666 SymbolTable::create_table(); 667 StringTable::create_table(); 668 ClassLoader::create_package_info_table(); 669 } 670 671 return JNI_OK; 672 } 673 674 // Choose the heap base address and oop encoding mode 675 // when compressed oops are used: 676 // Unscaled - Use 32-bits oops without encoding when 677 // NarrowOopHeapBaseMin + heap_size < 4Gb 678 // ZeroBased - Use zero based compressed oops with encoding when 679 // NarrowOopHeapBaseMin + heap_size < 32Gb 680 // HeapBased - Use compressed oops with heap base + encoding. 681 682 // 4Gb 683 static const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1); 684 // 32Gb 685 // OopEncodingHeapMax == UnscaledOopHeapMax << LogMinObjAlignmentInBytes; 686 687 char* Universe::preferred_heap_base(size_t heap_size, size_t alignment, NARROW_OOP_MODE mode) { 688 assert(is_size_aligned((size_t)OopEncodingHeapMax, alignment), "Must be"); 689 assert(is_size_aligned((size_t)UnscaledOopHeapMax, alignment), "Must be"); 690 assert(is_size_aligned(heap_size, alignment), "Must be"); 691 692 uintx heap_base_min_address_aligned = align_size_up(HeapBaseMinAddress, alignment); 693 694 size_t base = 0; 695 #ifdef _LP64 696 if (UseCompressedOops) { 697 assert(mode == UnscaledNarrowOop || 698 mode == ZeroBasedNarrowOop || 699 mode == HeapBasedNarrowOop, "mode is invalid"); 700 const size_t total_size = heap_size + heap_base_min_address_aligned; 701 // Return specified base for the first request. 702 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { 703 base = heap_base_min_address_aligned; 704 705 // If the total size is small enough to allow UnscaledNarrowOop then 706 // just use UnscaledNarrowOop. 707 } else if ((total_size <= OopEncodingHeapMax) && (mode != HeapBasedNarrowOop)) { 708 if ((total_size <= UnscaledOopHeapMax) && (mode == UnscaledNarrowOop) && 709 (Universe::narrow_oop_shift() == 0)) { 710 // Use 32-bits oops without encoding and 711 // place heap's top on the 4Gb boundary 712 base = (UnscaledOopHeapMax - heap_size); 713 } else { 714 // Can't reserve with NarrowOopShift == 0 715 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 716 717 if (mode == UnscaledNarrowOop || 718 mode == ZeroBasedNarrowOop && total_size <= UnscaledOopHeapMax) { 719 720 // Use zero based compressed oops with encoding and 721 // place heap's top on the 32Gb boundary in case 722 // total_size > 4Gb or failed to reserve below 4Gb. 723 uint64_t heap_top = OopEncodingHeapMax; 724 725 // For small heaps, save some space for compressed class pointer 726 // space so it can be decoded with no base. 727 if (UseCompressedClassPointers && !UseSharedSpaces && 728 OopEncodingHeapMax <= 32*G) { 729 730 uint64_t class_space = align_size_up(CompressedClassSpaceSize, alignment); 731 assert(is_size_aligned((size_t)OopEncodingHeapMax-class_space, 732 alignment), "difference must be aligned too"); 733 uint64_t new_top = OopEncodingHeapMax-class_space; 734 735 if (total_size <= new_top) { 736 heap_top = new_top; 737 } 738 } 739 740 // Align base to the adjusted top of the heap 741 base = heap_top - heap_size; 742 } 743 } 744 } else { 745 // UnscaledNarrowOop encoding didn't work, and no base was found for ZeroBasedOops or 746 // HeapBasedNarrowOop encoding was requested. So, can't reserve below 32Gb. 747 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 748 } 749 750 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks 751 // used in ReservedHeapSpace() constructors. 752 // The final values will be set in initialize_heap() below. 753 if ((base != 0) && ((base + heap_size) <= OopEncodingHeapMax)) { 754 // Use zero based compressed oops 755 Universe::set_narrow_oop_base(NULL); 756 // Don't need guard page for implicit checks in indexed 757 // addressing mode with zero based Compressed Oops. 758 Universe::set_narrow_oop_use_implicit_null_checks(true); 759 } else { 760 // Set to a non-NULL value so the ReservedSpace ctor computes 761 // the correct no-access prefix. 762 // The final value will be set in initialize_heap() below. 763 Universe::set_narrow_oop_base((address)UnscaledOopHeapMax); 764 #if defined(_WIN64) || defined(AIX) 765 if (UseLargePages) { 766 // Cannot allocate guard pages for implicit checks in indexed 767 // addressing mode when large pages are specified on windows. 768 Universe::set_narrow_oop_use_implicit_null_checks(false); 769 } 770 #endif // _WIN64 771 } 772 } 773 #endif 774 775 assert(is_ptr_aligned((char*)base, alignment), "Must be"); 776 return (char*)base; // also return NULL (don't care) for 32-bit VM 777 } 778 779 jint Universe::initialize_heap() { 780 781 if (UseParallelGC) { 782 #if INCLUDE_ALL_GCS 783 Universe::_collectedHeap = new ParallelScavengeHeap(); 784 #else // INCLUDE_ALL_GCS 785 fatal("UseParallelGC not supported in this VM."); 786 #endif // INCLUDE_ALL_GCS 787 788 } else if (UseG1GC) { 789 #if INCLUDE_ALL_GCS 790 G1CollectorPolicy* g1p = new G1CollectorPolicy(); 791 g1p->initialize_all(); 792 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); 793 Universe::_collectedHeap = g1h; 794 #else // INCLUDE_ALL_GCS 795 fatal("UseG1GC not supported in java kernel vm."); 796 #endif // INCLUDE_ALL_GCS 797 798 } else { 799 GenCollectorPolicy *gc_policy; 800 801 if (UseSerialGC) { 802 gc_policy = new MarkSweepPolicy(); 803 } else if (UseConcMarkSweepGC) { 804 #if INCLUDE_ALL_GCS 805 if (UseAdaptiveSizePolicy) { 806 gc_policy = new ASConcurrentMarkSweepPolicy(); 807 } else { 808 gc_policy = new ConcurrentMarkSweepPolicy(); 809 } 810 #else // INCLUDE_ALL_GCS 811 fatal("UseConcMarkSweepGC not supported in this VM."); 812 #endif // INCLUDE_ALL_GCS 813 } else { // default old generation 814 gc_policy = new MarkSweepPolicy(); 815 } 816 gc_policy->initialize_all(); 817 818 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); 819 } 820 821 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 822 823 jint status = Universe::heap()->initialize(); 824 if (status != JNI_OK) { 825 return status; 826 } 827 828 #ifdef _LP64 829 if (UseCompressedOops) { 830 // Subtract a page because something can get allocated at heap base. 831 // This also makes implicit null checking work, because the 832 // memory+1 page below heap_base needs to cause a signal. 833 // See needs_explicit_null_check. 834 // Only set the heap base for compressed oops because it indicates 835 // compressed oops for pstack code. 836 bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose); 837 if (verbose) { 838 tty->cr(); 839 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 840 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); 841 } 842 if (((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax)) { 843 // Can't reserve heap below 32Gb. 844 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap() 845 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 846 #ifdef AIX 847 // There is no protected page before the heap. This assures all oops 848 // are decoded so that NULL is preserved, so this page will not be accessed. 849 Universe::set_narrow_oop_use_implicit_null_checks(false); 850 #endif 851 if (verbose) { 852 tty->print(", %s: "PTR_FORMAT, 853 narrow_oop_mode_to_string(HeapBasedNarrowOop), 854 Universe::narrow_oop_base()); 855 } 856 } else { 857 Universe::set_narrow_oop_base(0); 858 if (verbose) { 859 tty->print(", %s", narrow_oop_mode_to_string(ZeroBasedNarrowOop)); 860 } 861 #ifdef _WIN64 862 if (!Universe::narrow_oop_use_implicit_null_checks()) { 863 // Don't need guard page for implicit checks in indexed addressing 864 // mode with zero based Compressed Oops. 865 Universe::set_narrow_oop_use_implicit_null_checks(true); 866 } 867 #endif // _WIN64 868 if((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 869 // Can't reserve heap below 4Gb. 870 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 871 } else { 872 Universe::set_narrow_oop_shift(0); 873 if (verbose) { 874 tty->print(", %s", narrow_oop_mode_to_string(UnscaledNarrowOop)); 875 } 876 } 877 } 878 879 if (verbose) { 880 tty->cr(); 881 tty->cr(); 882 } 883 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 884 } 885 // Universe::narrow_oop_base() is one page below the heap. 886 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 887 os::vm_page_size()) || 888 Universe::narrow_oop_base() == NULL, "invalid value"); 889 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 890 Universe::narrow_oop_shift() == 0, "invalid value"); 891 #endif 892 893 // We will never reach the CATCH below since Exceptions::_throw will cause 894 // the VM to exit if an exception is thrown during initialization 895 896 if (UseTLAB) { 897 assert(Universe::heap()->supports_tlab_allocation(), 898 "Should support thread-local allocation buffers"); 899 ThreadLocalAllocBuffer::startup_initialization(); 900 } 901 return JNI_OK; 902 } 903 904 905 // Reserve the Java heap, which is now the same for all GCs. 906 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 907 assert(alignment <= Arguments::conservative_max_heap_alignment(), 908 err_msg("actual alignment "SIZE_FORMAT" must be within maximum heap alignment "SIZE_FORMAT, 909 alignment, Arguments::conservative_max_heap_alignment())); 910 size_t total_reserved = align_size_up(heap_size, alignment); 911 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 912 "heap size is too big for compressed oops"); 913 914 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size()); 915 assert(!UseLargePages 916 || UseParallelGC 917 || use_large_pages, "Wrong alignment to use large pages"); 918 919 char* addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::UnscaledNarrowOop); 920 921 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, addr); 922 923 if (UseCompressedOops) { 924 if (addr != NULL && !total_rs.is_reserved()) { 925 // Failed to reserve at specified address - the requested memory 926 // region is taken already, for example, by 'java' launcher. 927 // Try again to reserver heap higher. 928 addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::ZeroBasedNarrowOop); 929 930 ReservedHeapSpace total_rs0(total_reserved, alignment, 931 use_large_pages, addr); 932 933 if (addr != NULL && !total_rs0.is_reserved()) { 934 // Failed to reserve at specified address again - give up. 935 addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::HeapBasedNarrowOop); 936 assert(addr == NULL, ""); 937 938 ReservedHeapSpace total_rs1(total_reserved, alignment, 939 use_large_pages, addr); 940 total_rs = total_rs1; 941 } else { 942 total_rs = total_rs0; 943 } 944 } 945 } 946 947 if (!total_rs.is_reserved()) { 948 vm_exit_during_initialization(err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", total_reserved/K)); 949 return total_rs; 950 } 951 952 if (UseCompressedOops) { 953 // Universe::initialize_heap() will reset this to NULL if unscaled 954 // or zero-based narrow oops are actually used. 955 address base = (address)(total_rs.base() - os::vm_page_size()); 956 Universe::set_narrow_oop_base(base); 957 } 958 return total_rs; 959 } 960 961 962 // It's the caller's responsibility to ensure glitch-freedom 963 // (if required). 964 void Universe::update_heap_info_at_gc() { 965 _heap_capacity_at_last_gc = heap()->capacity(); 966 _heap_used_at_last_gc = heap()->used(); 967 } 968 969 970 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 971 switch (mode) { 972 case UnscaledNarrowOop: 973 return "32-bits Oops"; 974 case ZeroBasedNarrowOop: 975 return "zero based Compressed Oops"; 976 case HeapBasedNarrowOop: 977 return "Compressed Oops with base"; 978 } 979 980 ShouldNotReachHere(); 981 return ""; 982 } 983 984 985 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 986 if (narrow_oop_base() != 0) { 987 return HeapBasedNarrowOop; 988 } 989 990 if (narrow_oop_shift() != 0) { 991 return ZeroBasedNarrowOop; 992 } 993 994 return UnscaledNarrowOop; 995 } 996 997 998 void universe2_init() { 999 EXCEPTION_MARK; 1000 Universe::genesis(CATCH); 1001 } 1002 1003 1004 // This function is defined in JVM.cpp 1005 extern void initialize_converter_functions(); 1006 1007 bool universe_post_init() { 1008 assert(!is_init_completed(), "Error: initialization not yet completed!"); 1009 Universe::_fully_initialized = true; 1010 EXCEPTION_MARK; 1011 { ResourceMark rm; 1012 Interpreter::initialize(); // needed for interpreter entry points 1013 if (!UseSharedSpaces) { 1014 HandleMark hm(THREAD); 1015 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 1016 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 1017 Universe::reinitialize_itables(CHECK_false); 1018 } 1019 } 1020 1021 HandleMark hm(THREAD); 1022 Klass* k; 1023 instanceKlassHandle k_h; 1024 // Setup preallocated empty java.lang.Class array 1025 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 1026 1027 // Setup preallocated OutOfMemoryError errors 1028 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 1029 k_h = instanceKlassHandle(THREAD, k); 1030 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 1031 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); 1032 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); 1033 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 1034 Universe::_out_of_memory_error_gc_overhead_limit = 1035 k_h->allocate_instance(CHECK_false); 1036 1037 // Setup preallocated NullPointerException 1038 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1039 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1040 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1041 // Setup preallocated ArithmeticException 1042 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1043 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1044 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1045 // Virtual Machine Error for when we get into a situation we can't resolve 1046 k = SystemDictionary::resolve_or_fail( 1047 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1048 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1049 if (!linked) { 1050 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1051 return false; // initialization failed 1052 } 1053 Universe::_virtual_machine_error_instance = 1054 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1055 1056 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1057 1058 if (!DumpSharedSpaces) { 1059 // These are the only Java fields that are currently set during shared space dumping. 1060 // We prefer to not handle this generally, so we always reinitialize these detail messages. 1061 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1062 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1063 1064 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 1065 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1066 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 1067 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1068 1069 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1070 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1071 1072 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1073 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1074 1075 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1076 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1077 1078 // Setup the array of errors that have preallocated backtrace 1079 k = Universe::_out_of_memory_error_java_heap->klass(); 1080 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1081 k_h = instanceKlassHandle(THREAD, k); 1082 1083 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1084 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 1085 for (int i=0; i<len; i++) { 1086 oop err = k_h->allocate_instance(CHECK_false); 1087 Handle err_h = Handle(THREAD, err); 1088 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1089 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1090 } 1091 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1092 } 1093 1094 1095 // Setup static method for registering finalizers 1096 // The finalizer klass must be linked before looking up the method, in 1097 // case it needs to get rewritten. 1098 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); 1099 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( 1100 vmSymbols::register_method_name(), 1101 vmSymbols::register_method_signature()); 1102 if (m == NULL || !m->is_static()) { 1103 tty->print_cr("Unable to link/verify Finalizer.register method"); 1104 return false; // initialization failed (cannot throw exception yet) 1105 } 1106 Universe::_finalizer_register_cache->init( 1107 SystemDictionary::Finalizer_klass(), m); 1108 1109 InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->link_class(CHECK_false); 1110 m = InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->find_method( 1111 vmSymbols::throwIllegalAccessError_name(), 1112 vmSymbols::void_method_signature()); 1113 if (m != NULL && !m->is_static()) { 1114 // Note null is okay; this method is used in itables, and if it is null, 1115 // then AbstractMethodError is thrown instead. 1116 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method"); 1117 return false; // initialization failed (cannot throw exception yet) 1118 } 1119 Universe::_throw_illegal_access_error = m; 1120 1121 // Setup method for registering loaded classes in class loader vector 1122 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); 1123 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1124 if (m == NULL || m->is_static()) { 1125 tty->print_cr("Unable to link/verify ClassLoader.addClass method"); 1126 return false; // initialization failed (cannot throw exception yet) 1127 } 1128 Universe::_loader_addClass_cache->init( 1129 SystemDictionary::ClassLoader_klass(), m); 1130 1131 // Setup method for checking protection domain 1132 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false); 1133 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())-> 1134 find_method(vmSymbols::impliesCreateAccessControlContext_name(), 1135 vmSymbols::void_boolean_signature()); 1136 // Allow NULL which should only happen with bootstrapping. 1137 if (m != NULL) { 1138 if (m->is_static()) { 1139 // NoSuchMethodException doesn't actually work because it tries to run the 1140 // <init> function before java_lang_Class is linked. Print error and exit. 1141 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); 1142 return false; // initialization failed 1143 } 1144 Universe::_pd_implies_cache->init( 1145 SystemDictionary::ProtectionDomain_klass(), m);; 1146 } 1147 1148 // The following is initializing converter functions for serialization in 1149 // JVM.cpp. If we clean up the StrictMath code above we may want to find 1150 // a better solution for this as well. 1151 initialize_converter_functions(); 1152 1153 // This needs to be done before the first scavenge/gc, since 1154 // it's an input to soft ref clearing policy. 1155 { 1156 MutexLocker x(Heap_lock); 1157 Universe::update_heap_info_at_gc(); 1158 } 1159 1160 // ("weak") refs processing infrastructure initialization 1161 Universe::heap()->post_initialize(); 1162 1163 // Initialize performance counters for metaspaces 1164 MetaspaceCounters::initialize_performance_counters(); 1165 CompressedClassSpaceCounters::initialize_performance_counters(); 1166 1167 MemoryService::add_metaspace_memory_pools(); 1168 1169 MemoryService::set_universe_heap(Universe::_collectedHeap); 1170 return true; 1171 } 1172 1173 1174 void Universe::compute_base_vtable_size() { 1175 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1176 } 1177 1178 1179 // %%% The Universe::flush_foo methods belong in CodeCache. 1180 1181 // Flushes compiled methods dependent on dependee. 1182 void Universe::flush_dependents_on(instanceKlassHandle dependee) { 1183 assert_lock_strong(Compile_lock); 1184 1185 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1186 1187 // CodeCache can only be updated by a thread_in_VM and they will all be 1188 // stopped during the safepoint so CodeCache will be safe to update without 1189 // holding the CodeCache_lock. 1190 1191 KlassDepChange changes(dependee); 1192 1193 // Compute the dependent nmethods 1194 if (CodeCache::mark_for_deoptimization(changes) > 0) { 1195 // At least one nmethod has been marked for deoptimization 1196 VM_Deoptimize op; 1197 VMThread::execute(&op); 1198 } 1199 } 1200 1201 // Flushes compiled methods dependent on a particular CallSite 1202 // instance when its target is different than the given MethodHandle. 1203 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) { 1204 assert_lock_strong(Compile_lock); 1205 1206 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1207 1208 // CodeCache can only be updated by a thread_in_VM and they will all be 1209 // stopped during the safepoint so CodeCache will be safe to update without 1210 // holding the CodeCache_lock. 1211 1212 CallSiteDepChange changes(call_site(), method_handle()); 1213 1214 // Compute the dependent nmethods that have a reference to a 1215 // CallSite object. We use InstanceKlass::mark_dependent_nmethod 1216 // directly instead of CodeCache::mark_for_deoptimization because we 1217 // want dependents on the call site class only not all classes in 1218 // the ContextStream. 1219 int marked = 0; 1220 { 1221 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1222 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass()); 1223 marked = call_site_klass->mark_dependent_nmethods(changes); 1224 } 1225 if (marked > 0) { 1226 // At least one nmethod has been marked for deoptimization 1227 VM_Deoptimize op; 1228 VMThread::execute(&op); 1229 } 1230 } 1231 1232 #ifdef HOTSWAP 1233 // Flushes compiled methods dependent on dependee in the evolutionary sense 1234 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { 1235 // --- Compile_lock is not held. However we are at a safepoint. 1236 assert_locked_or_safepoint(Compile_lock); 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 during the safepoint so CodeCache will be safe to update without 1241 // holding the CodeCache_lock. 1242 1243 // Compute the dependent nmethods 1244 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { 1245 // At least one nmethod has been marked for deoptimization 1246 1247 // All this already happens inside a VM_Operation, so we'll do all the work here. 1248 // Stuff copied from VM_Deoptimize and modified slightly. 1249 1250 // We do not want any GCs to happen while we are in the middle of this VM operation 1251 ResourceMark rm; 1252 DeoptimizationMarker dm; 1253 1254 // Deoptimize all activations depending on marked nmethods 1255 Deoptimization::deoptimize_dependents(); 1256 1257 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1258 CodeCache::make_marked_nmethods_not_entrant(); 1259 } 1260 } 1261 #endif // HOTSWAP 1262 1263 1264 // Flushes compiled methods dependent on dependee 1265 void Universe::flush_dependents_on_method(methodHandle m_h) { 1266 // --- Compile_lock is not held. However we are at a safepoint. 1267 assert_locked_or_safepoint(Compile_lock); 1268 1269 // CodeCache can only be updated by a thread_in_VM and they will all be 1270 // stopped dring the safepoint so CodeCache will be safe to update without 1271 // holding the CodeCache_lock. 1272 1273 // Compute the dependent nmethods 1274 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { 1275 // At least one nmethod has been marked for deoptimization 1276 1277 // All this already happens inside a VM_Operation, so we'll do all the work here. 1278 // Stuff copied from VM_Deoptimize and modified slightly. 1279 1280 // We do not want any GCs to happen while we are in the middle of this VM operation 1281 ResourceMark rm; 1282 DeoptimizationMarker dm; 1283 1284 // Deoptimize all activations depending on marked nmethods 1285 Deoptimization::deoptimize_dependents(); 1286 1287 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1288 CodeCache::make_marked_nmethods_not_entrant(); 1289 } 1290 } 1291 1292 void Universe::print() { 1293 print_on(gclog_or_tty); 1294 } 1295 1296 void Universe::print_on(outputStream* st, bool extended) { 1297 st->print_cr("Heap"); 1298 if (!extended) { 1299 heap()->print_on(st); 1300 } else { 1301 heap()->print_extended_on(st); 1302 } 1303 } 1304 1305 void Universe::print_heap_at_SIGBREAK() { 1306 if (PrintHeapAtSIGBREAK) { 1307 MutexLocker hl(Heap_lock); 1308 print_on(tty); 1309 tty->cr(); 1310 tty->flush(); 1311 } 1312 } 1313 1314 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1315 st->print_cr("{Heap before GC invocations=%u (full %u):", 1316 heap()->total_collections(), 1317 heap()->total_full_collections()); 1318 if (!PrintHeapAtGCExtended || ignore_extended) { 1319 heap()->print_on(st); 1320 } else { 1321 heap()->print_extended_on(st); 1322 } 1323 } 1324 1325 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1326 st->print_cr("Heap after GC invocations=%u (full %u):", 1327 heap()->total_collections(), 1328 heap()->total_full_collections()); 1329 if (!PrintHeapAtGCExtended || ignore_extended) { 1330 heap()->print_on(st); 1331 } else { 1332 heap()->print_extended_on(st); 1333 } 1334 st->print_cr("}"); 1335 } 1336 1337 void Universe::verify(VerifyOption option, const char* prefix, bool silent) { 1338 // The use of _verify_in_progress is a temporary work around for 1339 // 6320749. Don't bother with a creating a class to set and clear 1340 // it since it is only used in this method and the control flow is 1341 // straight forward. 1342 _verify_in_progress = true; 1343 1344 COMPILER2_PRESENT( 1345 assert(!DerivedPointerTable::is_active(), 1346 "DPT should not be active during verification " 1347 "(of thread stacks below)"); 1348 ) 1349 1350 ResourceMark rm; 1351 HandleMark hm; // Handles created during verification can be zapped 1352 _verify_count++; 1353 1354 if (!silent) gclog_or_tty->print("%s", prefix); 1355 if (!silent) gclog_or_tty->print("[Verifying "); 1356 if (!silent) gclog_or_tty->print("threads "); 1357 Threads::verify(); 1358 if (!silent) gclog_or_tty->print("heap "); 1359 heap()->verify(silent, option); 1360 if (!silent) gclog_or_tty->print("syms "); 1361 SymbolTable::verify(); 1362 if (!silent) gclog_or_tty->print("strs "); 1363 StringTable::verify(); 1364 { 1365 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1366 if (!silent) gclog_or_tty->print("zone "); 1367 CodeCache::verify(); 1368 } 1369 if (!silent) gclog_or_tty->print("dict "); 1370 SystemDictionary::verify(); 1371 #ifndef PRODUCT 1372 if (!silent) gclog_or_tty->print("cldg "); 1373 ClassLoaderDataGraph::verify(); 1374 #endif 1375 if (!silent) gclog_or_tty->print("metaspace chunks "); 1376 MetaspaceAux::verify_free_chunks(); 1377 if (!silent) gclog_or_tty->print("hand "); 1378 JNIHandles::verify(); 1379 if (!silent) gclog_or_tty->print("C-heap "); 1380 os::check_heap(); 1381 if (!silent) gclog_or_tty->print("code cache "); 1382 CodeCache::verify_oops(); 1383 if (!silent) gclog_or_tty->print_cr("]"); 1384 1385 _verify_in_progress = false; 1386 } 1387 1388 // Oop verification (see MacroAssembler::verify_oop) 1389 1390 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; 1391 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; 1392 1393 1394 #ifndef PRODUCT 1395 1396 static void calculate_verify_data(uintptr_t verify_data[2], 1397 HeapWord* low_boundary, 1398 HeapWord* high_boundary) { 1399 assert(low_boundary < high_boundary, "bad interval"); 1400 1401 // decide which low-order bits we require to be clear: 1402 size_t alignSize = MinObjAlignmentInBytes; 1403 size_t min_object_size = CollectedHeap::min_fill_size(); 1404 1405 // make an inclusive limit: 1406 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1407 uintptr_t min = (uintptr_t)low_boundary; 1408 assert(min < max, "bad interval"); 1409 uintptr_t diff = max ^ min; 1410 1411 // throw away enough low-order bits to make the diff vanish 1412 uintptr_t mask = (uintptr_t)(-1); 1413 while ((mask & diff) != 0) 1414 mask <<= 1; 1415 uintptr_t bits = (min & mask); 1416 assert(bits == (max & mask), "correct mask"); 1417 // check an intermediate value between min and max, just to make sure: 1418 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1419 1420 // require address alignment, too: 1421 mask |= (alignSize - 1); 1422 1423 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { 1424 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); 1425 } 1426 verify_data[0] = mask; 1427 verify_data[1] = bits; 1428 } 1429 1430 // Oop verification (see MacroAssembler::verify_oop) 1431 1432 uintptr_t Universe::verify_oop_mask() { 1433 MemRegion m = heap()->reserved_region(); 1434 calculate_verify_data(_verify_oop_data, 1435 m.start(), 1436 m.end()); 1437 return _verify_oop_data[0]; 1438 } 1439 1440 1441 1442 uintptr_t Universe::verify_oop_bits() { 1443 verify_oop_mask(); 1444 return _verify_oop_data[1]; 1445 } 1446 1447 uintptr_t Universe::verify_mark_mask() { 1448 return markOopDesc::lock_mask_in_place; 1449 } 1450 1451 uintptr_t Universe::verify_mark_bits() { 1452 intptr_t mask = verify_mark_mask(); 1453 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1454 assert((bits & ~mask) == 0, "no stray header bits"); 1455 return bits; 1456 } 1457 #endif // PRODUCT 1458 1459 1460 void Universe::compute_verify_oop_data() { 1461 verify_oop_mask(); 1462 verify_oop_bits(); 1463 verify_mark_mask(); 1464 verify_mark_bits(); 1465 } 1466 1467 1468 void LatestMethodCache::init(Klass* k, Method* m) { 1469 if (!UseSharedSpaces) { 1470 _klass = k; 1471 } 1472 #ifndef PRODUCT 1473 else { 1474 // sharing initilization should have already set up _klass 1475 assert(_klass != NULL, "just checking"); 1476 } 1477 #endif 1478 1479 _method_idnum = m->method_idnum(); 1480 assert(_method_idnum >= 0, "sanity check"); 1481 } 1482 1483 1484 Method* LatestMethodCache::get_method() { 1485 if (klass() == NULL) return NULL; 1486 InstanceKlass* ik = InstanceKlass::cast(klass()); 1487 Method* m = ik->method_with_idnum(method_idnum()); 1488 assert(m != NULL, "sanity check"); 1489 return m; 1490 } 1491 1492 1493 #ifdef ASSERT 1494 // Release dummy object(s) at bottom of heap 1495 bool Universe::release_fullgc_alot_dummy() { 1496 MutexLocker ml(FullGCALot_lock); 1497 if (_fullgc_alot_dummy_array != NULL) { 1498 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1499 // No more dummies to release, release entire array instead 1500 _fullgc_alot_dummy_array = NULL; 1501 return false; 1502 } 1503 if (!UseConcMarkSweepGC) { 1504 // Release dummy at bottom of old generation 1505 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1506 } 1507 // Release dummy at bottom of permanent generation 1508 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1509 } 1510 return true; 1511 } 1512 1513 #endif // ASSERT