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/aprofiler.hpp" 56 #include "runtime/arguments.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 // Known objects 83 Klass* Universe::_boolArrayKlassObj = NULL; 84 Klass* Universe::_byteArrayKlassObj = NULL; 85 Klass* Universe::_charArrayKlassObj = NULL; 86 Klass* Universe::_intArrayKlassObj = NULL; 87 Klass* Universe::_shortArrayKlassObj = NULL; 88 Klass* Universe::_longArrayKlassObj = NULL; 89 Klass* Universe::_singleArrayKlassObj = NULL; 90 Klass* Universe::_doubleArrayKlassObj = NULL; 91 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 92 Klass* Universe::_objectArrayKlassObj = NULL; 93 oop Universe::_int_mirror = NULL; 94 oop Universe::_float_mirror = NULL; 95 oop Universe::_double_mirror = NULL; 96 oop Universe::_byte_mirror = NULL; 97 oop Universe::_bool_mirror = NULL; 98 oop Universe::_char_mirror = NULL; 99 oop Universe::_long_mirror = NULL; 100 oop Universe::_short_mirror = NULL; 101 oop Universe::_void_mirror = NULL; 102 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 103 oop Universe::_main_thread_group = NULL; 104 oop Universe::_system_thread_group = NULL; 105 objArrayOop Universe::_the_empty_class_klass_array = NULL; 106 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 107 oop Universe::_the_null_string = NULL; 108 oop Universe::_the_min_jint_string = NULL; 109 LatestMethodOopCache* Universe::_finalizer_register_cache = NULL; 110 LatestMethodOopCache* Universe::_loader_addClass_cache = NULL; 111 ActiveMethodOopsCache* Universe::_reflect_invoke_cache = NULL; 112 oop Universe::_out_of_memory_error_java_heap = NULL; 113 oop Universe::_out_of_memory_error_perm_gen = 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 size_t Universe::_class_metaspace_size; 149 150 void Universe::basic_type_classes_do(void f(Klass*)) { 151 f(boolArrayKlassObj()); 152 f(byteArrayKlassObj()); 153 f(charArrayKlassObj()); 154 f(intArrayKlassObj()); 155 f(shortArrayKlassObj()); 156 f(longArrayKlassObj()); 157 f(singleArrayKlassObj()); 158 f(doubleArrayKlassObj()); 159 } 160 161 void Universe::oops_do(OopClosure* f, bool do_all) { 162 163 f->do_oop((oop*) &_int_mirror); 164 f->do_oop((oop*) &_float_mirror); 165 f->do_oop((oop*) &_double_mirror); 166 f->do_oop((oop*) &_byte_mirror); 167 f->do_oop((oop*) &_bool_mirror); 168 f->do_oop((oop*) &_char_mirror); 169 f->do_oop((oop*) &_long_mirror); 170 f->do_oop((oop*) &_short_mirror); 171 f->do_oop((oop*) &_void_mirror); 172 173 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 174 f->do_oop((oop*) &_mirrors[i]); 175 } 176 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 177 178 f->do_oop((oop*)&_the_empty_class_klass_array); 179 f->do_oop((oop*)&_the_null_string); 180 f->do_oop((oop*)&_the_min_jint_string); 181 f->do_oop((oop*)&_out_of_memory_error_java_heap); 182 f->do_oop((oop*)&_out_of_memory_error_perm_gen); 183 f->do_oop((oop*)&_out_of_memory_error_array_size); 184 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 185 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 186 f->do_oop((oop*)&_null_ptr_exception_instance); 187 f->do_oop((oop*)&_arithmetic_exception_instance); 188 f->do_oop((oop*)&_virtual_machine_error_instance); 189 f->do_oop((oop*)&_main_thread_group); 190 f->do_oop((oop*)&_system_thread_group); 191 f->do_oop((oop*)&_vm_exception); 192 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 193 } 194 195 // Serialize metadata in and out of CDS archive, not oops. 196 void Universe::serialize(SerializeClosure* f, bool do_all) { 197 198 f->do_ptr((void**)&_boolArrayKlassObj); 199 f->do_ptr((void**)&_byteArrayKlassObj); 200 f->do_ptr((void**)&_charArrayKlassObj); 201 f->do_ptr((void**)&_intArrayKlassObj); 202 f->do_ptr((void**)&_shortArrayKlassObj); 203 f->do_ptr((void**)&_longArrayKlassObj); 204 f->do_ptr((void**)&_singleArrayKlassObj); 205 f->do_ptr((void**)&_doubleArrayKlassObj); 206 f->do_ptr((void**)&_objectArrayKlassObj); 207 208 { 209 for (int i = 0; i < T_VOID+1; i++) { 210 if (_typeArrayKlassObjs[i] != NULL) { 211 assert(i >= T_BOOLEAN, "checking"); 212 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 213 } else if (do_all) { 214 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 215 } 216 } 217 } 218 219 f->do_ptr((void**)&_the_array_interfaces_array); 220 f->do_ptr((void**)&_the_empty_int_array); 221 f->do_ptr((void**)&_the_empty_short_array); 222 f->do_ptr((void**)&_the_empty_method_array); 223 f->do_ptr((void**)&_the_empty_klass_array); 224 _finalizer_register_cache->serialize(f); 225 _loader_addClass_cache->serialize(f); 226 _reflect_invoke_cache->serialize(f); 227 } 228 229 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 230 if (size < alignment || size % alignment != 0) { 231 vm_exit_during_initialization( 232 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 233 } 234 } 235 236 void initialize_basic_type_klass(Klass* k, TRAPS) { 237 Klass* ok = SystemDictionary::Object_klass(); 238 if (UseSharedSpaces) { 239 assert(k->super() == ok, "u3"); 240 k->restore_unshareable_info(CHECK); 241 } else { 242 k->initialize_supers(ok, CHECK); 243 } 244 k->append_to_sibling_list(); 245 } 246 247 void Universe::genesis(TRAPS) { 248 ResourceMark rm; 249 250 { FlagSetting fs(_bootstrapping, true); 251 252 { MutexLocker mc(Compile_lock); 253 254 // determine base vtable size; without that we cannot create the array klasses 255 compute_base_vtable_size(); 256 257 if (!UseSharedSpaces) { 258 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 259 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 260 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 261 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 262 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 263 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 264 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 265 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 266 267 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 268 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 269 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 270 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 271 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 272 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 273 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 274 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 275 276 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 277 278 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 279 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 280 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 281 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 282 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 283 } 284 } 285 286 vmSymbols::initialize(CHECK); 287 288 SystemDictionary::initialize(CHECK); 289 290 Klass* ok = SystemDictionary::Object_klass(); 291 292 _the_null_string = StringTable::intern("null", CHECK); 293 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 294 295 if (UseSharedSpaces) { 296 // Verify shared interfaces array. 297 assert(_the_array_interfaces_array->at(0) == 298 SystemDictionary::Cloneable_klass(), "u3"); 299 assert(_the_array_interfaces_array->at(1) == 300 SystemDictionary::Serializable_klass(), "u3"); 301 } else { 302 // Set up shared interfaces array. (Do this before supers are set up.) 303 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 304 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 305 } 306 307 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 308 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 309 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 310 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 311 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 312 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 313 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 314 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 315 } // end of core bootstrapping 316 317 // Maybe this could be lifted up now that object array can be initialized 318 // during the bootstrapping. 319 320 // OLD 321 // Initialize _objectArrayKlass after core bootstraping to make 322 // sure the super class is set up properly for _objectArrayKlass. 323 // --- 324 // NEW 325 // Since some of the old system object arrays have been converted to 326 // ordinary object arrays, _objectArrayKlass will be loaded when 327 // SystemDictionary::initialize(CHECK); is run. See the extra check 328 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 329 _objectArrayKlassObj = InstanceKlass:: 330 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 331 // OLD 332 // Add the class to the class hierarchy manually to make sure that 333 // its vtable is initialized after core bootstrapping is completed. 334 // --- 335 // New 336 // Have already been initialized. 337 _objectArrayKlassObj->append_to_sibling_list(); 338 339 // Compute is_jdk version flags. 340 // Only 1.3 or later has the java.lang.Shutdown class. 341 // Only 1.4 or later has the java.lang.CharSequence interface. 342 // Only 1.5 or later has the java.lang.management.MemoryUsage class. 343 if (JDK_Version::is_partially_initialized()) { 344 uint8_t jdk_version; 345 Klass* k = SystemDictionary::resolve_or_null( 346 vmSymbols::java_lang_management_MemoryUsage(), THREAD); 347 CLEAR_PENDING_EXCEPTION; // ignore exceptions 348 if (k == NULL) { 349 k = SystemDictionary::resolve_or_null( 350 vmSymbols::java_lang_CharSequence(), THREAD); 351 CLEAR_PENDING_EXCEPTION; // ignore exceptions 352 if (k == NULL) { 353 k = SystemDictionary::resolve_or_null( 354 vmSymbols::java_lang_Shutdown(), THREAD); 355 CLEAR_PENDING_EXCEPTION; // ignore exceptions 356 if (k == NULL) { 357 jdk_version = 2; 358 } else { 359 jdk_version = 3; 360 } 361 } else { 362 jdk_version = 4; 363 } 364 } else { 365 jdk_version = 5; 366 } 367 JDK_Version::fully_initialize(jdk_version); 368 } 369 370 #ifdef ASSERT 371 if (FullGCALot) { 372 // Allocate an array of dummy objects. 373 // We'd like these to be at the bottom of the old generation, 374 // so that when we free one and then collect, 375 // (almost) the whole heap moves 376 // and we find out if we actually update all the oops correctly. 377 // But we can't allocate directly in the old generation, 378 // so we allocate wherever, and hope that the first collection 379 // moves these objects to the bottom of the old generation. 380 // We can allocate directly in the permanent generation, so we do. 381 int size; 382 if (UseConcMarkSweepGC) { 383 warning("Using +FullGCALot with concurrent mark sweep gc " 384 "will not force all objects to relocate"); 385 size = FullGCALotDummies; 386 } else { 387 size = FullGCALotDummies * 2; 388 } 389 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 390 objArrayHandle dummy_array(THREAD, naked_array); 391 int i = 0; 392 while (i < size) { 393 // Allocate dummy in old generation 394 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); 395 dummy_array->obj_at_put(i++, dummy); 396 } 397 { 398 // Only modify the global variable inside the mutex. 399 // If we had a race to here, the other dummy_array instances 400 // and their elements just get dropped on the floor, which is fine. 401 MutexLocker ml(FullGCALot_lock); 402 if (_fullgc_alot_dummy_array == NULL) { 403 _fullgc_alot_dummy_array = dummy_array(); 404 } 405 } 406 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 407 } 408 #endif 409 410 // Initialize dependency array for null class loader 411 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 412 413 } 414 415 // CDS support for patching vtables in metadata in the shared archive. 416 // All types inherited from Metadata have vtables, but not types inherited 417 // from MetaspaceObj, because the latter does not have virtual functions. 418 // If the metadata type has a vtable, it cannot be shared in the read-only 419 // section of the CDS archive, because the vtable pointer is patched. 420 static inline void add_vtable(void** list, int* n, void* o, int count) { 421 guarantee((*n) < count, "vtable list too small"); 422 void* vtable = dereference_vptr(o); 423 assert(*(void**)(vtable) != NULL, "invalid vtable"); 424 list[(*n)++] = vtable; 425 } 426 427 void Universe::init_self_patching_vtbl_list(void** list, int count) { 428 int n = 0; 429 { InstanceKlass o; add_vtable(list, &n, &o, count); } 430 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 431 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 432 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 433 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 434 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 435 { Method o; add_vtable(list, &n, &o, count); } 436 { ConstantPool o; add_vtable(list, &n, &o, count); } 437 } 438 439 void Universe::initialize_basic_type_mirrors(TRAPS) { 440 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 441 _int_mirror = 442 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 443 _float_mirror = 444 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 445 _double_mirror = 446 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 447 _byte_mirror = 448 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 449 _bool_mirror = 450 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 451 _char_mirror = 452 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 453 _long_mirror = 454 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 455 _short_mirror = 456 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 457 _void_mirror = 458 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 459 460 _mirrors[T_INT] = _int_mirror; 461 _mirrors[T_FLOAT] = _float_mirror; 462 _mirrors[T_DOUBLE] = _double_mirror; 463 _mirrors[T_BYTE] = _byte_mirror; 464 _mirrors[T_BOOLEAN] = _bool_mirror; 465 _mirrors[T_CHAR] = _char_mirror; 466 _mirrors[T_LONG] = _long_mirror; 467 _mirrors[T_SHORT] = _short_mirror; 468 _mirrors[T_VOID] = _void_mirror; 469 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); 470 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); 471 } 472 473 void Universe::fixup_mirrors(TRAPS) { 474 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 475 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 476 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 477 // that the number of objects allocated at this point is very small. 478 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 479 HandleMark hm(THREAD); 480 // Cache the start of the static fields 481 InstanceMirrorKlass::init_offset_of_static_fields(); 482 483 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 484 int list_length = list->length(); 485 for (int i = 0; i < list_length; i++) { 486 Klass* k = list->at(i); 487 assert(k->is_klass(), "List should only hold classes"); 488 EXCEPTION_MARK; 489 KlassHandle kh(THREAD, k); 490 java_lang_Class::fixup_mirror(kh, CATCH); 491 } 492 delete java_lang_Class::fixup_mirror_list(); 493 java_lang_Class::set_fixup_mirror_list(NULL); 494 } 495 496 static bool has_run_finalizers_on_exit = false; 497 498 void Universe::run_finalizers_on_exit() { 499 if (has_run_finalizers_on_exit) return; 500 has_run_finalizers_on_exit = true; 501 502 // Called on VM exit. This ought to be run in a separate thread. 503 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 504 { 505 PRESERVE_EXCEPTION_MARK; 506 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 507 JavaValue result(T_VOID); 508 JavaCalls::call_static( 509 &result, 510 finalizer_klass, 511 vmSymbols::run_finalizers_on_exit_name(), 512 vmSymbols::void_method_signature(), 513 THREAD 514 ); 515 // Ignore any pending exceptions 516 CLEAR_PENDING_EXCEPTION; 517 } 518 } 519 520 521 // initialize_vtable could cause gc if 522 // 1) we specified true to initialize_vtable and 523 // 2) this ran after gc was enabled 524 // In case those ever change we use handles for oops 525 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 526 // init vtable of k and all subclasses 527 Klass* ko = k_h(); 528 klassVtable* vt = ko->vtable(); 529 if (vt) vt->initialize_vtable(false, CHECK); 530 if (ko->oop_is_instance()) { 531 InstanceKlass* ik = (InstanceKlass*)ko; 532 for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->next_sibling())) { 533 reinitialize_vtable_of(s_h, CHECK); 534 } 535 } 536 } 537 538 539 void initialize_itable_for_klass(Klass* k, TRAPS) { 540 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 541 } 542 543 544 void Universe::reinitialize_itables(TRAPS) { 545 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 546 547 } 548 549 550 bool Universe::on_page_boundary(void* addr) { 551 return ((uintptr_t) addr) % os::vm_page_size() == 0; 552 } 553 554 555 bool Universe::should_fill_in_stack_trace(Handle throwable) { 556 // never attempt to fill in the stack trace of preallocated errors that do not have 557 // backtrace. These errors are kept alive forever and may be "re-used" when all 558 // preallocated errors with backtrace have been consumed. Also need to avoid 559 // a potential loop which could happen if an out of memory occurs when attempting 560 // to allocate the backtrace. 561 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 562 (throwable() != Universe::_out_of_memory_error_perm_gen) && 563 (throwable() != Universe::_out_of_memory_error_array_size) && 564 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); 565 } 566 567 568 oop Universe::gen_out_of_memory_error(oop default_err) { 569 // generate an out of memory error: 570 // - if there is a preallocated error with backtrace available then return it wth 571 // a filled in stack trace. 572 // - if there are no preallocated errors with backtrace available then return 573 // an error without backtrace. 574 int next; 575 if (_preallocated_out_of_memory_error_avail_count > 0) { 576 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 577 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 578 } else { 579 next = -1; 580 } 581 if (next < 0) { 582 // all preallocated errors have been used. 583 // return default 584 return default_err; 585 } else { 586 // get the error object at the slot and set set it to NULL so that the 587 // array isn't keeping it alive anymore. 588 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 589 assert(exc != NULL, "slot has been used already"); 590 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 591 592 // use the message from the default error 593 oop msg = java_lang_Throwable::message(default_err); 594 assert(msg != NULL, "no message"); 595 java_lang_Throwable::set_message(exc, msg); 596 597 // populate the stack trace and return it. 598 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 599 return exc; 600 } 601 } 602 603 static intptr_t non_oop_bits = 0; 604 605 void* Universe::non_oop_word() { 606 // Neither the high bits nor the low bits of this value is allowed 607 // to look like (respectively) the high or low bits of a real oop. 608 // 609 // High and low are CPU-specific notions, but low always includes 610 // the low-order bit. Since oops are always aligned at least mod 4, 611 // setting the low-order bit will ensure that the low half of the 612 // word will never look like that of a real oop. 613 // 614 // Using the OS-supplied non-memory-address word (usually 0 or -1) 615 // will take care of the high bits, however many there are. 616 617 if (non_oop_bits == 0) { 618 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 619 } 620 621 return (void*)non_oop_bits; 622 } 623 624 jint universe_init() { 625 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 626 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 627 "LogHeapWordSize is incorrect."); 628 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 629 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 630 "oop size is not not a multiple of HeapWord size"); 631 TraceTime timer("Genesis", TraceStartupTime); 632 GC_locker::lock(); // do not allow gc during bootstrapping 633 JavaClasses::compute_hard_coded_offsets(); 634 635 jint status = Universe::initialize_heap(); 636 if (status != JNI_OK) { 637 return status; 638 } 639 640 // Create memory for metadata. Must be after initializing heap for 641 // DumpSharedSpaces. 642 ClassLoaderData::init_null_class_loader_data(); 643 644 // We have a heap so create the Method* caches before 645 // Metaspace::initialize_shared_spaces() tries to populate them. 646 Universe::_finalizer_register_cache = new LatestMethodOopCache(); 647 Universe::_loader_addClass_cache = new LatestMethodOopCache(); 648 Universe::_reflect_invoke_cache = new ActiveMethodOopsCache(); 649 650 if (UseSharedSpaces) { 651 // Read the data structures supporting the shared spaces (shared 652 // system dictionary, symbol table, etc.). After that, access to 653 // the file (other than the mapped regions) is no longer needed, and 654 // the file is closed. Closing the file does not affect the 655 // currently mapped regions. 656 MetaspaceShared::initialize_shared_spaces(); 657 StringTable::create_table(); 658 } else { 659 SymbolTable::create_table(); 660 StringTable::create_table(); 661 ClassLoader::create_package_info_table(); 662 } 663 664 return JNI_OK; 665 } 666 667 // Choose the heap base address and oop encoding mode 668 // when compressed oops are used: 669 // Unscaled - Use 32-bits oops without encoding when 670 // NarrowOopHeapBaseMin + heap_size < 4Gb 671 // ZeroBased - Use zero based compressed oops with encoding when 672 // NarrowOopHeapBaseMin + heap_size < 32Gb 673 // HeapBased - Use compressed oops with heap base + encoding. 674 675 // 4Gb 676 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); 677 // 32Gb 678 // OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes; 679 680 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) { 681 size_t base = 0; 682 #ifdef _LP64 683 if (UseCompressedOops) { 684 assert(mode == UnscaledNarrowOop || 685 mode == ZeroBasedNarrowOop || 686 mode == HeapBasedNarrowOop, "mode is invalid"); 687 const size_t total_size = heap_size + HeapBaseMinAddress; 688 // Return specified base for the first request. 689 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { 690 base = HeapBaseMinAddress; 691 692 // If the total size and the metaspace size are small enough to allow 693 // UnscaledNarrowOop then just use UnscaledNarrowOop. 694 } else if ((total_size <= OopEncodingHeapMax) && (mode != HeapBasedNarrowOop) && 695 (!UseCompressedKlassPointers || 696 (((OopEncodingHeapMax - heap_size) + Universe::class_metaspace_size()) <= KlassEncodingMetaspaceMax))) { 697 // We don't need to check the metaspace size here because it is always smaller 698 // than total_size. 699 if ((total_size <= NarrowOopHeapMax) && (mode == UnscaledNarrowOop) && 700 (Universe::narrow_oop_shift() == 0)) { 701 // Use 32-bits oops without encoding and 702 // place heap's top on the 4Gb boundary 703 base = (NarrowOopHeapMax - heap_size); 704 } else { 705 // Can't reserve with NarrowOopShift == 0 706 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 707 if (mode == UnscaledNarrowOop || 708 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { 709 // Use zero based compressed oops with encoding and 710 // place heap's top on the 32Gb boundary in case 711 // total_size > 4Gb or failed to reserve below 4Gb. 712 base = (OopEncodingHeapMax - heap_size); 713 } 714 } 715 716 // See if ZeroBaseNarrowOop encoding will work for a heap based at 717 // (KlassEncodingMetaspaceMax - class_metaspace_size()). 718 } else if (UseCompressedKlassPointers && (mode != HeapBasedNarrowOop) && 719 (Universe::class_metaspace_size() + HeapBaseMinAddress <= KlassEncodingMetaspaceMax) && 720 (KlassEncodingMetaspaceMax + heap_size - Universe::class_metaspace_size() <= OopEncodingHeapMax)) { 721 base = (KlassEncodingMetaspaceMax - Universe::class_metaspace_size()); 722 } else { 723 // UnscaledNarrowOop encoding didn't work, and no base was found for ZeroBasedOops or 724 // HeapBasedNarrowOop encoding was requested. So, can't reserve below 32Gb. 725 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 726 } 727 728 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks 729 // used in ReservedHeapSpace() constructors. 730 // The final values will be set in initialize_heap() below. 731 if ((base != 0) && ((base + heap_size) <= OopEncodingHeapMax) && 732 (!UseCompressedKlassPointers || (base + Universe::class_metaspace_size()) <= KlassEncodingMetaspaceMax)) { 733 // Use zero based compressed oops 734 Universe::set_narrow_oop_base(NULL); 735 // Don't need guard page for implicit checks in indexed 736 // addressing mode with zero based Compressed Oops. 737 Universe::set_narrow_oop_use_implicit_null_checks(true); 738 } else { 739 // Set to a non-NULL value so the ReservedSpace ctor computes 740 // the correct no-access prefix. 741 // The final value will be set in initialize_heap() below. 742 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); 743 #ifdef _WIN64 744 if (UseLargePages) { 745 // Cannot allocate guard pages for implicit checks in indexed 746 // addressing mode when large pages are specified on windows. 747 Universe::set_narrow_oop_use_implicit_null_checks(false); 748 } 749 #endif // _WIN64 750 } 751 } 752 #endif 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 (UseCompressedKlassPointers && 817 ((uint64_t)Universe::heap()->base() + Universe::class_metaspace_size() > KlassEncodingMetaspaceMax))) { 818 // Can't reserve heap below 32Gb. 819 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap() 820 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 821 if (verbose) { 822 tty->print(", Compressed Oops with base: "PTR_FORMAT, Universe::narrow_oop_base()); 823 } 824 } else { 825 Universe::set_narrow_oop_base(0); 826 if (verbose) { 827 tty->print(", zero based Compressed Oops"); 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(", 32-bits Oops"); 843 } 844 } 845 } 846 if (verbose) { 847 tty->cr(); 848 tty->cr(); 849 } 850 if (UseCompressedKlassPointers) { 851 Universe::set_narrow_klass_base(Universe::narrow_oop_base()); 852 Universe::set_narrow_klass_shift(MIN2(Universe::narrow_oop_shift(), LogKlassAlignmentInBytes)); 853 } 854 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 855 } 856 // Universe::narrow_oop_base() is one page below the metaspace 857 // base. The actual metaspace base depends on alignment constraints 858 // so we don't know its exact location here. 859 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - os::vm_page_size() - ClassMetaspaceSize) || 860 Universe::narrow_oop_base() == NULL, "invalid value"); 861 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 862 Universe::narrow_oop_shift() == 0, "invalid value"); 863 #endif 864 865 // We will never reach the CATCH below since Exceptions::_throw will cause 866 // the VM to exit if an exception is thrown during initialization 867 868 if (UseTLAB) { 869 assert(Universe::heap()->supports_tlab_allocation(), 870 "Should support thread-local allocation buffers"); 871 ThreadLocalAllocBuffer::startup_initialization(); 872 } 873 return JNI_OK; 874 } 875 876 877 // Reserve the Java heap, which is now the same for all GCs. 878 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 879 // Add in the class metaspace area so the classes in the headers can 880 // be compressed the same as instances. 881 // Need to round class space size up because it's below the heap and 882 // the actual alignment depends on its size. 883 Universe::set_class_metaspace_size(align_size_up(ClassMetaspaceSize, alignment)); 884 size_t total_reserved = align_size_up(heap_size + Universe::class_metaspace_size(), alignment); 885 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 886 "heap size is too big for compressed oops"); 887 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); 888 889 ReservedHeapSpace total_rs(total_reserved, alignment, UseLargePages, 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, Universe::ZeroBasedNarrowOop); 897 898 ReservedHeapSpace total_rs0(total_reserved, alignment, 899 UseLargePages, 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, Universe::HeapBasedNarrowOop); 904 assert(addr == NULL, ""); 905 906 ReservedHeapSpace total_rs1(total_reserved, alignment, 907 UseLargePages, 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 // Split the reserved space into main Java heap and a space for 921 // classes so that they can be compressed using the same algorithm 922 // as compressed oops. If compress oops and compress klass ptrs are 923 // used we need the meta space first: if the alignment used for 924 // compressed oops is greater than the one used for compressed klass 925 // ptrs, a metadata space on top of the heap could become 926 // unreachable. 927 ReservedSpace class_rs = total_rs.first_part(Universe::class_metaspace_size()); 928 ReservedSpace heap_rs = total_rs.last_part(Universe::class_metaspace_size(), alignment); 929 Metaspace::initialize_class_space(class_rs); 930 931 if (UseCompressedOops) { 932 // Universe::initialize_heap() will reset this to NULL if unscaled 933 // or zero-based narrow oops are actually used. 934 address base = (address)(total_rs.base() - os::vm_page_size()); 935 Universe::set_narrow_oop_base(base); 936 } 937 return heap_rs; 938 } 939 940 941 // It's the caller's repsonsibility to ensure glitch-freedom 942 // (if required). 943 void Universe::update_heap_info_at_gc() { 944 _heap_capacity_at_last_gc = heap()->capacity(); 945 _heap_used_at_last_gc = heap()->used(); 946 } 947 948 949 950 void universe2_init() { 951 EXCEPTION_MARK; 952 Universe::genesis(CATCH); 953 } 954 955 956 // This function is defined in JVM.cpp 957 extern void initialize_converter_functions(); 958 959 bool universe_post_init() { 960 assert(!is_init_completed(), "Error: initialization not yet completed!"); 961 Universe::_fully_initialized = true; 962 EXCEPTION_MARK; 963 { ResourceMark rm; 964 Interpreter::initialize(); // needed for interpreter entry points 965 if (!UseSharedSpaces) { 966 HandleMark hm(THREAD); 967 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 968 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 969 Universe::reinitialize_itables(CHECK_false); 970 } 971 } 972 973 HandleMark hm(THREAD); 974 Klass* k; 975 instanceKlassHandle k_h; 976 // Setup preallocated empty java.lang.Class array 977 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 978 979 // Setup preallocated OutOfMemoryError errors 980 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 981 k_h = instanceKlassHandle(THREAD, k); 982 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 983 Universe::_out_of_memory_error_perm_gen = k_h->allocate_instance(CHECK_false); 984 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 985 Universe::_out_of_memory_error_gc_overhead_limit = 986 k_h->allocate_instance(CHECK_false); 987 988 // Setup preallocated NullPointerException 989 // (this is currently used for a cheap & dirty solution in compiler exception handling) 990 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 991 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 992 // Setup preallocated ArithmeticException 993 // (this is currently used for a cheap & dirty solution in compiler exception handling) 994 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 995 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 996 // Virtual Machine Error for when we get into a situation we can't resolve 997 k = SystemDictionary::resolve_or_fail( 998 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 999 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1000 if (!linked) { 1001 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1002 return false; // initialization failed 1003 } 1004 Universe::_virtual_machine_error_instance = 1005 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1006 1007 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1008 1009 if (!DumpSharedSpaces) { 1010 // These are the only Java fields that are currently set during shared space dumping. 1011 // We prefer to not handle this generally, so we always reinitialize these detail messages. 1012 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1013 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1014 1015 msg = java_lang_String::create_from_str("Metadata space", CHECK_false); 1016 java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg()); 1017 1018 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1019 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1020 1021 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1022 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1023 1024 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1025 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1026 1027 // Setup the array of errors that have preallocated backtrace 1028 k = Universe::_out_of_memory_error_java_heap->klass(); 1029 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1030 k_h = instanceKlassHandle(THREAD, k); 1031 1032 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1033 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 1034 for (int i=0; i<len; i++) { 1035 oop err = k_h->allocate_instance(CHECK_false); 1036 Handle err_h = Handle(THREAD, err); 1037 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1038 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1039 } 1040 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1041 } 1042 1043 1044 // Setup static method for registering finalizers 1045 // The finalizer klass must be linked before looking up the method, in 1046 // case it needs to get rewritten. 1047 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); 1048 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( 1049 vmSymbols::register_method_name(), 1050 vmSymbols::register_method_signature()); 1051 if (m == NULL || !m->is_static()) { 1052 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1053 "java.lang.ref.Finalizer.register", false); 1054 } 1055 Universe::_finalizer_register_cache->init( 1056 SystemDictionary::Finalizer_klass(), m, CHECK_false); 1057 1058 // Resolve on first use and initialize class. 1059 // Note: No race-condition here, since a resolve will always return the same result 1060 1061 // Setup method for security checks 1062 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_reflect_Method(), true, CHECK_false); 1063 k_h = instanceKlassHandle(THREAD, k); 1064 k_h->link_class(CHECK_false); 1065 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_object_array_object_signature()); 1066 if (m == NULL || m->is_static()) { 1067 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1068 "java.lang.reflect.Method.invoke", false); 1069 } 1070 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false); 1071 1072 // Setup method for registering loaded classes in class loader vector 1073 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); 1074 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1075 if (m == NULL || m->is_static()) { 1076 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1077 "java.lang.ClassLoader.addClass", false); 1078 } 1079 Universe::_loader_addClass_cache->init( 1080 SystemDictionary::ClassLoader_klass(), m, CHECK_false); 1081 1082 // The folowing is initializing converter functions for serialization in 1083 // JVM.cpp. If we clean up the StrictMath code above we may want to find 1084 // a better solution for this as well. 1085 initialize_converter_functions(); 1086 1087 // This needs to be done before the first scavenge/gc, since 1088 // it's an input to soft ref clearing policy. 1089 { 1090 MutexLocker x(Heap_lock); 1091 Universe::update_heap_info_at_gc(); 1092 } 1093 1094 // ("weak") refs processing infrastructure initialization 1095 Universe::heap()->post_initialize(); 1096 1097 // Initialize performance counters for metaspaces 1098 MetaspaceCounters::initialize_performance_counters(); 1099 1100 GC_locker::unlock(); // allow gc after bootstrapping 1101 1102 MemoryService::set_universe_heap(Universe::_collectedHeap); 1103 return true; 1104 } 1105 1106 1107 void Universe::compute_base_vtable_size() { 1108 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1109 } 1110 1111 1112 // %%% The Universe::flush_foo methods belong in CodeCache. 1113 1114 // Flushes compiled methods dependent on dependee. 1115 void Universe::flush_dependents_on(instanceKlassHandle dependee) { 1116 assert_lock_strong(Compile_lock); 1117 1118 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1119 1120 // CodeCache can only be updated by a thread_in_VM and they will all be 1121 // stopped dring the safepoint so CodeCache will be safe to update without 1122 // holding the CodeCache_lock. 1123 1124 KlassDepChange changes(dependee); 1125 1126 // Compute the dependent nmethods 1127 if (CodeCache::mark_for_deoptimization(changes) > 0) { 1128 // At least one nmethod has been marked for deoptimization 1129 VM_Deoptimize op; 1130 VMThread::execute(&op); 1131 } 1132 } 1133 1134 // Flushes compiled methods dependent on a particular CallSite 1135 // instance when its target is different than the given MethodHandle. 1136 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) { 1137 assert_lock_strong(Compile_lock); 1138 1139 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1140 1141 // CodeCache can only be updated by a thread_in_VM and they will all be 1142 // stopped dring the safepoint so CodeCache will be safe to update without 1143 // holding the CodeCache_lock. 1144 1145 CallSiteDepChange changes(call_site(), method_handle()); 1146 1147 // Compute the dependent nmethods that have a reference to a 1148 // CallSite object. We use InstanceKlass::mark_dependent_nmethod 1149 // directly instead of CodeCache::mark_for_deoptimization because we 1150 // want dependents on the call site class only not all classes in 1151 // the ContextStream. 1152 int marked = 0; 1153 { 1154 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1155 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass()); 1156 marked = call_site_klass->mark_dependent_nmethods(changes); 1157 } 1158 if (marked > 0) { 1159 // At least one nmethod has been marked for deoptimization 1160 VM_Deoptimize op; 1161 VMThread::execute(&op); 1162 } 1163 } 1164 1165 #ifdef HOTSWAP 1166 // Flushes compiled methods dependent on dependee in the evolutionary sense 1167 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { 1168 // --- Compile_lock is not held. However we are at a safepoint. 1169 assert_locked_or_safepoint(Compile_lock); 1170 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1171 1172 // CodeCache can only be updated by a thread_in_VM and they will all be 1173 // stopped dring the safepoint so CodeCache will be safe to update without 1174 // holding the CodeCache_lock. 1175 1176 // Compute the dependent nmethods 1177 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { 1178 // At least one nmethod has been marked for deoptimization 1179 1180 // All this already happens inside a VM_Operation, so we'll do all the work here. 1181 // Stuff copied from VM_Deoptimize and modified slightly. 1182 1183 // We do not want any GCs to happen while we are in the middle of this VM operation 1184 ResourceMark rm; 1185 DeoptimizationMarker dm; 1186 1187 // Deoptimize all activations depending on marked nmethods 1188 Deoptimization::deoptimize_dependents(); 1189 1190 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1191 CodeCache::make_marked_nmethods_not_entrant(); 1192 } 1193 } 1194 #endif // HOTSWAP 1195 1196 1197 // Flushes compiled methods dependent on dependee 1198 void Universe::flush_dependents_on_method(methodHandle m_h) { 1199 // --- Compile_lock is not held. However we are at a safepoint. 1200 assert_locked_or_safepoint(Compile_lock); 1201 1202 // CodeCache can only be updated by a thread_in_VM and they will all be 1203 // stopped dring the safepoint so CodeCache will be safe to update without 1204 // holding the CodeCache_lock. 1205 1206 // Compute the dependent nmethods 1207 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { 1208 // At least one nmethod has been marked for deoptimization 1209 1210 // All this already happens inside a VM_Operation, so we'll do all the work here. 1211 // Stuff copied from VM_Deoptimize and modified slightly. 1212 1213 // We do not want any GCs to happen while we are in the middle of this VM operation 1214 ResourceMark rm; 1215 DeoptimizationMarker dm; 1216 1217 // Deoptimize all activations depending on marked nmethods 1218 Deoptimization::deoptimize_dependents(); 1219 1220 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1221 CodeCache::make_marked_nmethods_not_entrant(); 1222 } 1223 } 1224 1225 void Universe::print() { 1226 print_on(gclog_or_tty); 1227 } 1228 1229 void Universe::print_on(outputStream* st, bool extended) { 1230 st->print_cr("Heap"); 1231 if (!extended) { 1232 heap()->print_on(st); 1233 } else { 1234 heap()->print_extended_on(st); 1235 } 1236 } 1237 1238 void Universe::print_heap_at_SIGBREAK() { 1239 if (PrintHeapAtSIGBREAK) { 1240 MutexLocker hl(Heap_lock); 1241 print_on(tty); 1242 tty->cr(); 1243 tty->flush(); 1244 } 1245 } 1246 1247 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1248 st->print_cr("{Heap before GC invocations=%u (full %u):", 1249 heap()->total_collections(), 1250 heap()->total_full_collections()); 1251 if (!PrintHeapAtGCExtended || ignore_extended) { 1252 heap()->print_on(st); 1253 } else { 1254 heap()->print_extended_on(st); 1255 } 1256 } 1257 1258 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1259 st->print_cr("Heap after GC invocations=%u (full %u):", 1260 heap()->total_collections(), 1261 heap()->total_full_collections()); 1262 if (!PrintHeapAtGCExtended || ignore_extended) { 1263 heap()->print_on(st); 1264 } else { 1265 heap()->print_extended_on(st); 1266 } 1267 st->print_cr("}"); 1268 } 1269 1270 void Universe::verify(VerifyOption option, const char* prefix, bool silent) { 1271 // The use of _verify_in_progress is a temporary work around for 1272 // 6320749. Don't bother with a creating a class to set and clear 1273 // it since it is only used in this method and the control flow is 1274 // straight forward. 1275 _verify_in_progress = true; 1276 1277 COMPILER2_PRESENT( 1278 assert(!DerivedPointerTable::is_active(), 1279 "DPT should not be active during verification " 1280 "(of thread stacks below)"); 1281 ) 1282 1283 ResourceMark rm; 1284 HandleMark hm; // Handles created during verification can be zapped 1285 _verify_count++; 1286 1287 if (!silent) gclog_or_tty->print(prefix); 1288 if (!silent) gclog_or_tty->print("[Verifying "); 1289 if (!silent) gclog_or_tty->print("threads "); 1290 Threads::verify(); 1291 if (!silent) gclog_or_tty->print("heap "); 1292 heap()->verify(silent, option); 1293 if (!silent) gclog_or_tty->print("syms "); 1294 SymbolTable::verify(); 1295 if (!silent) gclog_or_tty->print("strs "); 1296 StringTable::verify(); 1297 { 1298 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1299 if (!silent) gclog_or_tty->print("zone "); 1300 CodeCache::verify(); 1301 } 1302 if (!silent) gclog_or_tty->print("dict "); 1303 SystemDictionary::verify(); 1304 #ifndef PRODUCT 1305 if (!silent) gclog_or_tty->print("cldg "); 1306 ClassLoaderDataGraph::verify(); 1307 #endif 1308 if (!silent) gclog_or_tty->print("metaspace chunks "); 1309 MetaspaceAux::verify_free_chunks(); 1310 if (!silent) gclog_or_tty->print("hand "); 1311 JNIHandles::verify(); 1312 if (!silent) gclog_or_tty->print("C-heap "); 1313 os::check_heap(); 1314 if (!silent) gclog_or_tty->print("code cache "); 1315 CodeCache::verify_oops(); 1316 if (!silent) gclog_or_tty->print_cr("]"); 1317 1318 _verify_in_progress = false; 1319 } 1320 1321 // Oop verification (see MacroAssembler::verify_oop) 1322 1323 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; 1324 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; 1325 1326 1327 #ifndef PRODUCT 1328 1329 static void calculate_verify_data(uintptr_t verify_data[2], 1330 HeapWord* low_boundary, 1331 HeapWord* high_boundary) { 1332 assert(low_boundary < high_boundary, "bad interval"); 1333 1334 // decide which low-order bits we require to be clear: 1335 size_t alignSize = MinObjAlignmentInBytes; 1336 size_t min_object_size = CollectedHeap::min_fill_size(); 1337 1338 // make an inclusive limit: 1339 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1340 uintptr_t min = (uintptr_t)low_boundary; 1341 assert(min < max, "bad interval"); 1342 uintptr_t diff = max ^ min; 1343 1344 // throw away enough low-order bits to make the diff vanish 1345 uintptr_t mask = (uintptr_t)(-1); 1346 while ((mask & diff) != 0) 1347 mask <<= 1; 1348 uintptr_t bits = (min & mask); 1349 assert(bits == (max & mask), "correct mask"); 1350 // check an intermediate value between min and max, just to make sure: 1351 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1352 1353 // require address alignment, too: 1354 mask |= (alignSize - 1); 1355 1356 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { 1357 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); 1358 } 1359 verify_data[0] = mask; 1360 verify_data[1] = bits; 1361 } 1362 1363 // Oop verification (see MacroAssembler::verify_oop) 1364 1365 uintptr_t Universe::verify_oop_mask() { 1366 MemRegion m = heap()->reserved_region(); 1367 calculate_verify_data(_verify_oop_data, 1368 m.start(), 1369 m.end()); 1370 return _verify_oop_data[0]; 1371 } 1372 1373 1374 1375 uintptr_t Universe::verify_oop_bits() { 1376 verify_oop_mask(); 1377 return _verify_oop_data[1]; 1378 } 1379 1380 uintptr_t Universe::verify_mark_mask() { 1381 return markOopDesc::lock_mask_in_place; 1382 } 1383 1384 uintptr_t Universe::verify_mark_bits() { 1385 intptr_t mask = verify_mark_mask(); 1386 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1387 assert((bits & ~mask) == 0, "no stray header bits"); 1388 return bits; 1389 } 1390 #endif // PRODUCT 1391 1392 1393 void Universe::compute_verify_oop_data() { 1394 verify_oop_mask(); 1395 verify_oop_bits(); 1396 verify_mark_mask(); 1397 verify_mark_bits(); 1398 } 1399 1400 1401 void CommonMethodOopCache::init(Klass* k, Method* m, TRAPS) { 1402 if (!UseSharedSpaces) { 1403 _klass = k; 1404 } 1405 #ifndef PRODUCT 1406 else { 1407 // sharing initilization should have already set up _klass 1408 assert(_klass != NULL, "just checking"); 1409 } 1410 #endif 1411 1412 _method_idnum = m->method_idnum(); 1413 assert(_method_idnum >= 0, "sanity check"); 1414 } 1415 1416 1417 ActiveMethodOopsCache::~ActiveMethodOopsCache() { 1418 if (_prev_methods != NULL) { 1419 delete _prev_methods; 1420 _prev_methods = NULL; 1421 } 1422 } 1423 1424 1425 void ActiveMethodOopsCache::add_previous_version(Method* method) { 1426 assert(Thread::current()->is_VM_thread(), 1427 "only VMThread can add previous versions"); 1428 1429 // Only append the previous method if it is executing on the stack. 1430 if (method->on_stack()) { 1431 1432 if (_prev_methods == NULL) { 1433 // This is the first previous version so make some space. 1434 // Start with 2 elements under the assumption that the class 1435 // won't be redefined much. 1436 _prev_methods = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Method*>(2, true); 1437 } 1438 1439 // RC_TRACE macro has an embedded ResourceMark 1440 RC_TRACE(0x00000100, 1441 ("add: %s(%s): adding prev version ref for cached method @%d", 1442 method->name()->as_C_string(), method->signature()->as_C_string(), 1443 _prev_methods->length())); 1444 1445 _prev_methods->append(method); 1446 } 1447 1448 1449 // Since the caller is the VMThread and we are at a safepoint, this is a good 1450 // time to clear out unused method references. 1451 1452 if (_prev_methods == NULL) return; 1453 1454 for (int i = _prev_methods->length() - 1; i >= 0; i--) { 1455 Method* method = _prev_methods->at(i); 1456 assert(method != NULL, "weak method ref was unexpectedly cleared"); 1457 1458 if (!method->on_stack()) { 1459 // This method isn't running anymore so remove it 1460 _prev_methods->remove_at(i); 1461 MetadataFactory::free_metadata(method->method_holder()->class_loader_data(), method); 1462 } else { 1463 // RC_TRACE macro has an embedded ResourceMark 1464 RC_TRACE(0x00000400, 1465 ("add: %s(%s): previous cached method @%d is alive", 1466 method->name()->as_C_string(), method->signature()->as_C_string(), i)); 1467 } 1468 } 1469 } // end add_previous_version() 1470 1471 1472 bool ActiveMethodOopsCache::is_same_method(const Method* method) const { 1473 InstanceKlass* ik = InstanceKlass::cast(klass()); 1474 const Method* check_method = ik->method_with_idnum(method_idnum()); 1475 assert(check_method != NULL, "sanity check"); 1476 if (check_method == method) { 1477 // done with the easy case 1478 return true; 1479 } 1480 1481 if (_prev_methods != NULL) { 1482 // The cached method has been redefined at least once so search 1483 // the previous versions for a match. 1484 for (int i = 0; i < _prev_methods->length(); i++) { 1485 check_method = _prev_methods->at(i); 1486 if (check_method == method) { 1487 // a previous version matches 1488 return true; 1489 } 1490 } 1491 } 1492 1493 // either no previous versions or no previous version matched 1494 return false; 1495 } 1496 1497 1498 Method* LatestMethodOopCache::get_Method() { 1499 InstanceKlass* ik = InstanceKlass::cast(klass()); 1500 Method* m = ik->method_with_idnum(method_idnum()); 1501 assert(m != NULL, "sanity check"); 1502 return m; 1503 } 1504 1505 1506 #ifdef ASSERT 1507 // Release dummy object(s) at bottom of heap 1508 bool Universe::release_fullgc_alot_dummy() { 1509 MutexLocker ml(FullGCALot_lock); 1510 if (_fullgc_alot_dummy_array != NULL) { 1511 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1512 // No more dummies to release, release entire array instead 1513 _fullgc_alot_dummy_array = NULL; 1514 return false; 1515 } 1516 if (!UseConcMarkSweepGC) { 1517 // Release dummy at bottom of old generation 1518 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1519 } 1520 // Release dummy at bottom of permanent generation 1521 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1522 } 1523 return true; 1524 } 1525 1526 #endif // ASSERT