1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/classLoaderData.hpp" 28 #include "classfile/javaClasses.hpp" 29 #include "classfile/symbolTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "code/codeCache.hpp" 33 #include "code/dependencies.hpp" 34 #include "gc_interface/collectedHeap.inline.hpp" 35 #include "interpreter/interpreter.hpp" 36 #include "memory/cardTableModRefBS.hpp" 37 #include "memory/gcLocker.inline.hpp" 38 #include "memory/genCollectedHeap.hpp" 39 #include "memory/genRemSet.hpp" 40 #include "memory/generation.hpp" 41 #include "memory/metadataFactory.hpp" 42 #include "memory/metaspaceShared.hpp" 43 #include "memory/oopFactory.hpp" 44 #include "memory/space.hpp" 45 #include "memory/universe.hpp" 46 #include "memory/universe.inline.hpp" 47 #include "oops/constantPool.hpp" 48 #include "oops/instanceClassLoaderKlass.hpp" 49 #include "oops/instanceKlass.hpp" 50 #include "oops/instanceMirrorKlass.hpp" 51 #include "oops/instanceRefKlass.hpp" 52 #include "oops/oop.inline.hpp" 53 #include "oops/typeArrayKlass.hpp" 54 #include "prims/jvmtiRedefineClassesTrace.hpp" 55 #include "runtime/arguments.hpp" 56 #include "runtime/deoptimization.hpp" 57 #include "runtime/fprofiler.hpp" 58 #include "runtime/handles.inline.hpp" 59 #include "runtime/init.hpp" 60 #include "runtime/java.hpp" 61 #include "runtime/javaCalls.hpp" 62 #include "runtime/sharedRuntime.hpp" 63 #include "runtime/synchronizer.hpp" 64 #include "runtime/thread.inline.hpp" 65 #include "runtime/timer.hpp" 66 #include "runtime/vm_operations.hpp" 67 #include "services/memoryService.hpp" 68 #include "utilities/copy.hpp" 69 #include "utilities/events.hpp" 70 #include "utilities/hashtable.inline.hpp" 71 #include "utilities/preserveException.hpp" 72 #include "utilities/macros.hpp" 73 #if INCLUDE_ALL_GCS 74 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" 75 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp" 76 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 77 #include "gc_implementation/g1/g1CollectorPolicy.hpp" 78 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 79 #endif // INCLUDE_ALL_GCS 80 81 // Known objects 82 Klass* Universe::_boolArrayKlassObj = NULL; 83 Klass* Universe::_byteArrayKlassObj = NULL; 84 Klass* Universe::_charArrayKlassObj = NULL; 85 Klass* Universe::_intArrayKlassObj = NULL; 86 Klass* Universe::_shortArrayKlassObj = NULL; 87 Klass* Universe::_longArrayKlassObj = NULL; 88 Klass* Universe::_singleArrayKlassObj = NULL; 89 Klass* Universe::_doubleArrayKlassObj = NULL; 90 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 91 Klass* Universe::_objectArrayKlassObj = NULL; 92 oop Universe::_int_mirror = NULL; 93 oop Universe::_float_mirror = NULL; 94 oop Universe::_double_mirror = NULL; 95 oop Universe::_byte_mirror = NULL; 96 oop Universe::_bool_mirror = NULL; 97 oop Universe::_char_mirror = NULL; 98 oop Universe::_long_mirror = NULL; 99 oop Universe::_short_mirror = NULL; 100 oop Universe::_void_mirror = NULL; 101 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 102 oop Universe::_main_thread_group = NULL; 103 oop Universe::_system_thread_group = NULL; 104 objArrayOop Universe::_the_empty_class_klass_array = NULL; 105 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 106 oop Universe::_the_null_string = NULL; 107 oop Universe::_the_min_jint_string = NULL; 108 LatestMethodOopCache* Universe::_finalizer_register_cache = NULL; 109 LatestMethodOopCache* Universe::_loader_addClass_cache = NULL; 110 LatestMethodOopCache* Universe::_pd_implies_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_metaspace = NULL; 114 oop Universe::_out_of_memory_error_class_metaspace = NULL; 115 oop Universe::_out_of_memory_error_array_size = NULL; 116 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 117 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 118 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 119 bool Universe::_verify_in_progress = false; 120 oop Universe::_null_ptr_exception_instance = NULL; 121 oop Universe::_arithmetic_exception_instance = NULL; 122 oop Universe::_virtual_machine_error_instance = NULL; 123 oop Universe::_vm_exception = NULL; 124 Array<int>* Universe::_the_empty_int_array = NULL; 125 Array<u2>* Universe::_the_empty_short_array = NULL; 126 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 127 Array<Method*>* Universe::_the_empty_method_array = NULL; 128 129 // These variables are guarded by FullGCALot_lock. 130 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 131 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 132 133 // Heap 134 int Universe::_verify_count = 0; 135 136 int Universe::_base_vtable_size = 0; 137 bool Universe::_bootstrapping = false; 138 bool Universe::_fully_initialized = false; 139 140 size_t Universe::_heap_capacity_at_last_gc; 141 size_t Universe::_heap_used_at_last_gc = 0; 142 143 CollectedHeap* Universe::_collectedHeap = NULL; 144 145 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 146 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 147 address Universe::_narrow_ptrs_base; 148 149 void Universe::basic_type_classes_do(void f(Klass*)) { 150 f(boolArrayKlassObj()); 151 f(byteArrayKlassObj()); 152 f(charArrayKlassObj()); 153 f(intArrayKlassObj()); 154 f(shortArrayKlassObj()); 155 f(longArrayKlassObj()); 156 f(singleArrayKlassObj()); 157 f(doubleArrayKlassObj()); 158 } 159 160 void Universe::oops_do(OopClosure* f, bool do_all) { 161 162 f->do_oop((oop*) &_int_mirror); 163 f->do_oop((oop*) &_float_mirror); 164 f->do_oop((oop*) &_double_mirror); 165 f->do_oop((oop*) &_byte_mirror); 166 f->do_oop((oop*) &_bool_mirror); 167 f->do_oop((oop*) &_char_mirror); 168 f->do_oop((oop*) &_long_mirror); 169 f->do_oop((oop*) &_short_mirror); 170 f->do_oop((oop*) &_void_mirror); 171 172 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 173 f->do_oop((oop*) &_mirrors[i]); 174 } 175 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 176 177 f->do_oop((oop*)&_the_empty_class_klass_array); 178 f->do_oop((oop*)&_the_null_string); 179 f->do_oop((oop*)&_the_min_jint_string); 180 f->do_oop((oop*)&_out_of_memory_error_java_heap); 181 f->do_oop((oop*)&_out_of_memory_error_metaspace); 182 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 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 _pd_implies_cache->serialize(f); 228 } 229 230 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 231 if (size < alignment || size % alignment != 0) { 232 vm_exit_during_initialization( 233 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 234 } 235 } 236 237 void initialize_basic_type_klass(Klass* k, TRAPS) { 238 Klass* ok = SystemDictionary::Object_klass(); 239 if (UseSharedSpaces) { 240 assert(k->super() == ok, "u3"); 241 k->restore_unshareable_info(CHECK); 242 } else { 243 k->initialize_supers(ok, CHECK); 244 } 245 k->append_to_sibling_list(); 246 } 247 248 void Universe::genesis(TRAPS) { 249 ResourceMark rm; 250 251 { FlagSetting fs(_bootstrapping, true); 252 253 { MutexLocker mc(Compile_lock); 254 255 // determine base vtable size; without that we cannot create the array klasses 256 compute_base_vtable_size(); 257 258 if (!UseSharedSpaces) { 259 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 260 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 261 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 262 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 263 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 264 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 265 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 266 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 267 268 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 269 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 270 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 271 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 272 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 273 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 274 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 275 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 276 277 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 278 279 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 280 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 281 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 282 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 283 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 284 } 285 } 286 287 vmSymbols::initialize(CHECK); 288 289 SystemDictionary::initialize(CHECK); 290 291 Klass* ok = SystemDictionary::Object_klass(); 292 293 _the_null_string = StringTable::intern("null", CHECK); 294 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 295 296 if (UseSharedSpaces) { 297 // Verify shared interfaces array. 298 assert(_the_array_interfaces_array->at(0) == 299 SystemDictionary::Cloneable_klass(), "u3"); 300 assert(_the_array_interfaces_array->at(1) == 301 SystemDictionary::Serializable_klass(), "u3"); 302 } else { 303 // Set up shared interfaces array. (Do this before supers are set up.) 304 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 305 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 306 } 307 308 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 309 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 310 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 311 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 312 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 313 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 314 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 315 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 316 } // end of core bootstrapping 317 318 // Maybe this could be lifted up now that object array can be initialized 319 // during the bootstrapping. 320 321 // OLD 322 // Initialize _objectArrayKlass after core bootstraping to make 323 // sure the super class is set up properly for _objectArrayKlass. 324 // --- 325 // NEW 326 // Since some of the old system object arrays have been converted to 327 // ordinary object arrays, _objectArrayKlass will be loaded when 328 // SystemDictionary::initialize(CHECK); is run. See the extra check 329 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 330 _objectArrayKlassObj = InstanceKlass:: 331 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 332 // OLD 333 // Add the class to the class hierarchy manually to make sure that 334 // its vtable is initialized after core bootstrapping is completed. 335 // --- 336 // New 337 // Have already been initialized. 338 _objectArrayKlassObj->append_to_sibling_list(); 339 340 // Compute is_jdk version flags. 341 // Only 1.3 or later has the java.lang.Shutdown class. 342 // Only 1.4 or later has the java.lang.CharSequence interface. 343 // Only 1.5 or later has the java.lang.management.MemoryUsage class. 344 if (JDK_Version::is_partially_initialized()) { 345 uint8_t jdk_version; 346 Klass* k = SystemDictionary::resolve_or_null( 347 vmSymbols::java_lang_management_MemoryUsage(), THREAD); 348 CLEAR_PENDING_EXCEPTION; // ignore exceptions 349 if (k == NULL) { 350 k = SystemDictionary::resolve_or_null( 351 vmSymbols::java_lang_CharSequence(), THREAD); 352 CLEAR_PENDING_EXCEPTION; // ignore exceptions 353 if (k == NULL) { 354 k = SystemDictionary::resolve_or_null( 355 vmSymbols::java_lang_Shutdown(), THREAD); 356 CLEAR_PENDING_EXCEPTION; // ignore exceptions 357 if (k == NULL) { 358 jdk_version = 2; 359 } else { 360 jdk_version = 3; 361 } 362 } else { 363 jdk_version = 4; 364 } 365 } else { 366 jdk_version = 5; 367 } 368 JDK_Version::fully_initialize(jdk_version); 369 } 370 371 #ifdef ASSERT 372 if (FullGCALot) { 373 // Allocate an array of dummy objects. 374 // We'd like these to be at the bottom of the old generation, 375 // so that when we free one and then collect, 376 // (almost) the whole heap moves 377 // and we find out if we actually update all the oops correctly. 378 // But we can't allocate directly in the old generation, 379 // so we allocate wherever, and hope that the first collection 380 // moves these objects to the bottom of the old generation. 381 // We can allocate directly in the permanent generation, so we do. 382 int size; 383 if (UseConcMarkSweepGC) { 384 warning("Using +FullGCALot with concurrent mark sweep gc " 385 "will not force all objects to relocate"); 386 size = FullGCALotDummies; 387 } else { 388 size = FullGCALotDummies * 2; 389 } 390 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 391 objArrayHandle dummy_array(THREAD, naked_array); 392 int i = 0; 393 while (i < size) { 394 // Allocate dummy in old generation 395 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); 396 dummy_array->obj_at_put(i++, dummy); 397 } 398 { 399 // Only modify the global variable inside the mutex. 400 // If we had a race to here, the other dummy_array instances 401 // and their elements just get dropped on the floor, which is fine. 402 MutexLocker ml(FullGCALot_lock); 403 if (_fullgc_alot_dummy_array == NULL) { 404 _fullgc_alot_dummy_array = dummy_array(); 405 } 406 } 407 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 408 } 409 #endif 410 411 // Initialize dependency array for null class loader 412 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 413 414 } 415 416 // CDS support for patching vtables in metadata in the shared archive. 417 // All types inherited from Metadata have vtables, but not types inherited 418 // from MetaspaceObj, because the latter does not have virtual functions. 419 // If the metadata type has a vtable, it cannot be shared in the read-only 420 // section of the CDS archive, because the vtable pointer is patched. 421 static inline void add_vtable(void** list, int* n, void* o, int count) { 422 guarantee((*n) < count, "vtable list too small"); 423 void* vtable = dereference_vptr(o); 424 assert(*(void**)(vtable) != NULL, "invalid vtable"); 425 list[(*n)++] = vtable; 426 } 427 428 void Universe::init_self_patching_vtbl_list(void** list, int count) { 429 int n = 0; 430 { InstanceKlass o; add_vtable(list, &n, &o, count); } 431 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 432 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 433 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 434 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 435 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 436 { Method o; add_vtable(list, &n, &o, count); } 437 { ConstantPool o; add_vtable(list, &n, &o, count); } 438 } 439 440 void Universe::initialize_basic_type_mirrors(TRAPS) { 441 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 442 _int_mirror = 443 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 444 _float_mirror = 445 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 446 _double_mirror = 447 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 448 _byte_mirror = 449 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 450 _bool_mirror = 451 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 452 _char_mirror = 453 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 454 _long_mirror = 455 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 456 _short_mirror = 457 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 458 _void_mirror = 459 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 460 461 _mirrors[T_INT] = _int_mirror; 462 _mirrors[T_FLOAT] = _float_mirror; 463 _mirrors[T_DOUBLE] = _double_mirror; 464 _mirrors[T_BYTE] = _byte_mirror; 465 _mirrors[T_BOOLEAN] = _bool_mirror; 466 _mirrors[T_CHAR] = _char_mirror; 467 _mirrors[T_LONG] = _long_mirror; 468 _mirrors[T_SHORT] = _short_mirror; 469 _mirrors[T_VOID] = _void_mirror; 470 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); 471 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); 472 } 473 474 void Universe::fixup_mirrors(TRAPS) { 475 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 476 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 477 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 478 // that the number of objects allocated at this point is very small. 479 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 480 HandleMark hm(THREAD); 481 // Cache the start of the static fields 482 InstanceMirrorKlass::init_offset_of_static_fields(); 483 484 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 485 int list_length = list->length(); 486 for (int i = 0; i < list_length; i++) { 487 Klass* k = list->at(i); 488 assert(k->is_klass(), "List should only hold classes"); 489 EXCEPTION_MARK; 490 KlassHandle kh(THREAD, k); 491 java_lang_Class::fixup_mirror(kh, CATCH); 492 } 493 delete java_lang_Class::fixup_mirror_list(); 494 java_lang_Class::set_fixup_mirror_list(NULL); 495 } 496 497 static bool has_run_finalizers_on_exit = false; 498 499 void Universe::run_finalizers_on_exit() { 500 if (has_run_finalizers_on_exit) return; 501 has_run_finalizers_on_exit = true; 502 503 // Called on VM exit. This ought to be run in a separate thread. 504 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 505 { 506 PRESERVE_EXCEPTION_MARK; 507 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 508 JavaValue result(T_VOID); 509 JavaCalls::call_static( 510 &result, 511 finalizer_klass, 512 vmSymbols::run_finalizers_on_exit_name(), 513 vmSymbols::void_method_signature(), 514 THREAD 515 ); 516 // Ignore any pending exceptions 517 CLEAR_PENDING_EXCEPTION; 518 } 519 } 520 521 522 // initialize_vtable could cause gc if 523 // 1) we specified true to initialize_vtable and 524 // 2) this ran after gc was enabled 525 // In case those ever change we use handles for oops 526 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 527 // init vtable of k and all subclasses 528 Klass* ko = k_h(); 529 klassVtable* vt = ko->vtable(); 530 if (vt) vt->initialize_vtable(false, CHECK); 531 if (ko->oop_is_instance()) { 532 InstanceKlass* ik = (InstanceKlass*)ko; 533 for (KlassHandle s_h(THREAD, ik->subklass()); 534 s_h() != NULL; 535 s_h = KlassHandle(THREAD, s_h()->next_sibling())) { 536 reinitialize_vtable_of(s_h, CHECK); 537 } 538 } 539 } 540 541 542 void initialize_itable_for_klass(Klass* k, TRAPS) { 543 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 544 } 545 546 547 void Universe::reinitialize_itables(TRAPS) { 548 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 549 550 } 551 552 553 bool Universe::on_page_boundary(void* addr) { 554 return ((uintptr_t) addr) % os::vm_page_size() == 0; 555 } 556 557 558 bool Universe::should_fill_in_stack_trace(Handle throwable) { 559 // never attempt to fill in the stack trace of preallocated errors that do not have 560 // backtrace. These errors are kept alive forever and may be "re-used" when all 561 // preallocated errors with backtrace have been consumed. Also need to avoid 562 // a potential loop which could happen if an out of memory occurs when attempting 563 // to allocate the backtrace. 564 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 565 (throwable() != Universe::_out_of_memory_error_metaspace) && 566 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 567 (throwable() != Universe::_out_of_memory_error_array_size) && 568 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); 569 } 570 571 572 oop Universe::gen_out_of_memory_error(oop default_err) { 573 // generate an out of memory error: 574 // - if there is a preallocated error with backtrace available then return it wth 575 // a filled in stack trace. 576 // - if there are no preallocated errors with backtrace available then return 577 // an error without backtrace. 578 int next; 579 if (_preallocated_out_of_memory_error_avail_count > 0) { 580 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 581 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 582 } else { 583 next = -1; 584 } 585 if (next < 0) { 586 // all preallocated errors have been used. 587 // return default 588 return default_err; 589 } else { 590 // get the error object at the slot and set set it to NULL so that the 591 // array isn't keeping it alive anymore. 592 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 593 assert(exc != NULL, "slot has been used already"); 594 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 595 596 // use the message from the default error 597 oop msg = java_lang_Throwable::message(default_err); 598 assert(msg != NULL, "no message"); 599 java_lang_Throwable::set_message(exc, msg); 600 601 // populate the stack trace and return it. 602 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 603 return exc; 604 } 605 } 606 607 static intptr_t non_oop_bits = 0; 608 609 void* Universe::non_oop_word() { 610 // Neither the high bits nor the low bits of this value is allowed 611 // to look like (respectively) the high or low bits of a real oop. 612 // 613 // High and low are CPU-specific notions, but low always includes 614 // the low-order bit. Since oops are always aligned at least mod 4, 615 // setting the low-order bit will ensure that the low half of the 616 // word will never look like that of a real oop. 617 // 618 // Using the OS-supplied non-memory-address word (usually 0 or -1) 619 // will take care of the high bits, however many there are. 620 621 if (non_oop_bits == 0) { 622 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 623 } 624 625 return (void*)non_oop_bits; 626 } 627 628 jint universe_init() { 629 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 630 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 631 "LogHeapWordSize is incorrect."); 632 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 633 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 634 "oop size is not not a multiple of HeapWord size"); 635 TraceTime timer("Genesis", TraceStartupTime); 636 GC_locker::lock(); // do not allow gc during bootstrapping 637 JavaClasses::compute_hard_coded_offsets(); 638 639 jint status = Universe::initialize_heap(); 640 if (status != JNI_OK) { 641 return status; 642 } 643 644 Metaspace::global_initialize(); 645 646 // Create memory for metadata. Must be after initializing heap for 647 // DumpSharedSpaces. 648 ClassLoaderData::init_null_class_loader_data(); 649 650 // We have a heap so create the Method* caches before 651 // Metaspace::initialize_shared_spaces() tries to populate them. 652 Universe::_finalizer_register_cache = new LatestMethodOopCache(); 653 Universe::_loader_addClass_cache = new LatestMethodOopCache(); 654 Universe::_pd_implies_cache = new LatestMethodOopCache(); 655 Universe::_reflect_invoke_cache = new ActiveMethodOopsCache(); 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 NarrowOopHeapMax = (uint64_t(max_juint) + 1); 684 // 32Gb 685 // OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes; 686 687 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) { 688 size_t base = 0; 689 #ifdef _LP64 690 if (UseCompressedOops) { 691 assert(mode == UnscaledNarrowOop || 692 mode == ZeroBasedNarrowOop || 693 mode == HeapBasedNarrowOop, "mode is invalid"); 694 const size_t total_size = heap_size + HeapBaseMinAddress; 695 // Return specified base for the first request. 696 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { 697 base = HeapBaseMinAddress; 698 699 // If the total size is small enough to allow UnscaledNarrowOop then 700 // just use UnscaledNarrowOop. 701 } else if ((total_size <= OopEncodingHeapMax) && (mode != HeapBasedNarrowOop)) { 702 if ((total_size <= NarrowOopHeapMax) && (mode == UnscaledNarrowOop) && 703 (Universe::narrow_oop_shift() == 0)) { 704 // Use 32-bits oops without encoding and 705 // place heap's top on the 4Gb boundary 706 base = (NarrowOopHeapMax - heap_size); 707 } else { 708 // Can't reserve with NarrowOopShift == 0 709 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 710 if (mode == UnscaledNarrowOop || 711 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { 712 // Use zero based compressed oops with encoding and 713 // place heap's top on the 32Gb boundary in case 714 // total_size > 4Gb or failed to reserve below 4Gb. 715 base = (OopEncodingHeapMax - heap_size); 716 } 717 } 718 } else { 719 // UnscaledNarrowOop encoding didn't work, and no base was found for ZeroBasedOops or 720 // HeapBasedNarrowOop encoding was requested. So, can't reserve below 32Gb. 721 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 722 } 723 724 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks 725 // used in ReservedHeapSpace() constructors. 726 // The final values will be set in initialize_heap() below. 727 if ((base != 0) && ((base + heap_size) <= OopEncodingHeapMax)) { 728 // Use zero based compressed oops 729 Universe::set_narrow_oop_base(NULL); 730 // Don't need guard page for implicit checks in indexed 731 // addressing mode with zero based Compressed Oops. 732 Universe::set_narrow_oop_use_implicit_null_checks(true); 733 } else { 734 // Set to a non-NULL value so the ReservedSpace ctor computes 735 // the correct no-access prefix. 736 // The final value will be set in initialize_heap() below. 737 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); 738 #ifdef _WIN64 739 if (UseLargePages) { 740 // Cannot allocate guard pages for implicit checks in indexed 741 // addressing mode when large pages are specified on windows. 742 Universe::set_narrow_oop_use_implicit_null_checks(false); 743 } 744 #endif // _WIN64 745 } 746 } 747 #endif 748 return (char*)base; // also return NULL (don't care) for 32-bit VM 749 } 750 751 jint Universe::initialize_heap() { 752 753 if (UseParallelGC) { 754 #if INCLUDE_ALL_GCS 755 Universe::_collectedHeap = new ParallelScavengeHeap(); 756 #else // INCLUDE_ALL_GCS 757 fatal("UseParallelGC not supported in this VM."); 758 #endif // INCLUDE_ALL_GCS 759 760 } else if (UseG1GC) { 761 #if INCLUDE_ALL_GCS 762 G1CollectorPolicy* g1p = new G1CollectorPolicy(); 763 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); 764 Universe::_collectedHeap = g1h; 765 #else // INCLUDE_ALL_GCS 766 fatal("UseG1GC not supported in java kernel vm."); 767 #endif // INCLUDE_ALL_GCS 768 769 } else { 770 GenCollectorPolicy *gc_policy; 771 772 if (UseSerialGC) { 773 gc_policy = new MarkSweepPolicy(); 774 } else if (UseConcMarkSweepGC) { 775 #if INCLUDE_ALL_GCS 776 if (UseAdaptiveSizePolicy) { 777 gc_policy = new ASConcurrentMarkSweepPolicy(); 778 } else { 779 gc_policy = new ConcurrentMarkSweepPolicy(); 780 } 781 #else // INCLUDE_ALL_GCS 782 fatal("UseConcMarkSweepGC not supported in this VM."); 783 #endif // INCLUDE_ALL_GCS 784 } else { // default old generation 785 gc_policy = new MarkSweepPolicy(); 786 } 787 788 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); 789 } 790 791 jint status = Universe::heap()->initialize(); 792 if (status != JNI_OK) { 793 return status; 794 } 795 796 #ifdef _LP64 797 if (UseCompressedOops) { 798 // Subtract a page because something can get allocated at heap base. 799 // This also makes implicit null checking work, because the 800 // memory+1 page below heap_base needs to cause a signal. 801 // See needs_explicit_null_check. 802 // Only set the heap base for compressed oops because it indicates 803 // compressed oops for pstack code. 804 bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose); 805 if (verbose) { 806 tty->cr(); 807 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 808 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); 809 } 810 if (((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax)) { 811 // Can't reserve heap below 32Gb. 812 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap() 813 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 814 if (verbose) { 815 tty->print(", %s: "PTR_FORMAT, 816 narrow_oop_mode_to_string(HeapBasedNarrowOop), 817 Universe::narrow_oop_base()); 818 } 819 } else { 820 Universe::set_narrow_oop_base(0); 821 if (verbose) { 822 tty->print(", %s", narrow_oop_mode_to_string(ZeroBasedNarrowOop)); 823 } 824 #ifdef _WIN64 825 if (!Universe::narrow_oop_use_implicit_null_checks()) { 826 // Don't need guard page for implicit checks in indexed addressing 827 // mode with zero based Compressed Oops. 828 Universe::set_narrow_oop_use_implicit_null_checks(true); 829 } 830 #endif // _WIN64 831 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { 832 // Can't reserve heap below 4Gb. 833 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 834 } else { 835 Universe::set_narrow_oop_shift(0); 836 if (verbose) { 837 tty->print(", %s", narrow_oop_mode_to_string(UnscaledNarrowOop)); 838 } 839 } 840 } 841 842 if (verbose) { 843 tty->cr(); 844 tty->cr(); 845 } 846 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 847 } 848 // Universe::narrow_oop_base() is one page below the heap. 849 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 850 os::vm_page_size()) || 851 Universe::narrow_oop_base() == NULL, "invalid value"); 852 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 853 Universe::narrow_oop_shift() == 0, "invalid value"); 854 #endif 855 856 // We will never reach the CATCH below since Exceptions::_throw will cause 857 // the VM to exit if an exception is thrown during initialization 858 859 if (UseTLAB) { 860 assert(Universe::heap()->supports_tlab_allocation(), 861 "Should support thread-local allocation buffers"); 862 ThreadLocalAllocBuffer::startup_initialization(); 863 } 864 return JNI_OK; 865 } 866 867 868 // Reserve the Java heap, which is now the same for all GCs. 869 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 870 size_t total_reserved = align_size_up(heap_size, alignment); 871 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 872 "heap size is too big for compressed oops"); 873 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); 874 875 ReservedHeapSpace total_rs(total_reserved, alignment, UseLargePages, addr); 876 877 if (UseCompressedOops) { 878 if (addr != NULL && !total_rs.is_reserved()) { 879 // Failed to reserve at specified address - the requested memory 880 // region is taken already, for example, by 'java' launcher. 881 // Try again to reserver heap higher. 882 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); 883 884 ReservedHeapSpace total_rs0(total_reserved, alignment, 885 UseLargePages, addr); 886 887 if (addr != NULL && !total_rs0.is_reserved()) { 888 // Failed to reserve at specified address again - give up. 889 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); 890 assert(addr == NULL, ""); 891 892 ReservedHeapSpace total_rs1(total_reserved, alignment, 893 UseLargePages, addr); 894 total_rs = total_rs1; 895 } else { 896 total_rs = total_rs0; 897 } 898 } 899 } 900 901 if (!total_rs.is_reserved()) { 902 vm_exit_during_initialization(err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", total_reserved/K)); 903 return total_rs; 904 } 905 906 if (UseCompressedOops) { 907 // Universe::initialize_heap() will reset this to NULL if unscaled 908 // or zero-based narrow oops are actually used. 909 address base = (address)(total_rs.base() - os::vm_page_size()); 910 Universe::set_narrow_oop_base(base); 911 } 912 return total_rs; 913 } 914 915 916 // It's the caller's responsibility to ensure glitch-freedom 917 // (if required). 918 void Universe::update_heap_info_at_gc() { 919 _heap_capacity_at_last_gc = heap()->capacity(); 920 _heap_used_at_last_gc = heap()->used(); 921 } 922 923 924 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 925 switch (mode) { 926 case UnscaledNarrowOop: 927 return "32-bits Oops"; 928 case ZeroBasedNarrowOop: 929 return "zero based Compressed Oops"; 930 case HeapBasedNarrowOop: 931 return "Compressed Oops with base"; 932 } 933 934 ShouldNotReachHere(); 935 return ""; 936 } 937 938 939 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 940 if (narrow_oop_base() != 0) { 941 return HeapBasedNarrowOop; 942 } 943 944 if (narrow_oop_shift() != 0) { 945 return ZeroBasedNarrowOop; 946 } 947 948 return UnscaledNarrowOop; 949 } 950 951 952 void universe2_init() { 953 EXCEPTION_MARK; 954 Universe::genesis(CATCH); 955 } 956 957 958 // This function is defined in JVM.cpp 959 extern void initialize_converter_functions(); 960 961 bool universe_post_init() { 962 assert(!is_init_completed(), "Error: initialization not yet completed!"); 963 Universe::_fully_initialized = true; 964 EXCEPTION_MARK; 965 { ResourceMark rm; 966 Interpreter::initialize(); // needed for interpreter entry points 967 if (!UseSharedSpaces) { 968 HandleMark hm(THREAD); 969 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 970 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 971 Universe::reinitialize_itables(CHECK_false); 972 } 973 } 974 975 HandleMark hm(THREAD); 976 Klass* k; 977 instanceKlassHandle k_h; 978 // Setup preallocated empty java.lang.Class array 979 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 980 981 // Setup preallocated OutOfMemoryError errors 982 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 983 k_h = instanceKlassHandle(THREAD, k); 984 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 985 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); 986 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); 987 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 988 Universe::_out_of_memory_error_gc_overhead_limit = 989 k_h->allocate_instance(CHECK_false); 990 991 // Setup preallocated NullPointerException 992 // (this is currently used for a cheap & dirty solution in compiler exception handling) 993 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 994 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 995 // Setup preallocated ArithmeticException 996 // (this is currently used for a cheap & dirty solution in compiler exception handling) 997 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 998 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 999 // Virtual Machine Error for when we get into a situation we can't resolve 1000 k = SystemDictionary::resolve_or_fail( 1001 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1002 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1003 if (!linked) { 1004 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1005 return false; // initialization failed 1006 } 1007 Universe::_virtual_machine_error_instance = 1008 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1009 1010 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1011 1012 if (!DumpSharedSpaces) { 1013 // These are the only Java fields that are currently set during shared space dumping. 1014 // We prefer to not handle this generally, so we always reinitialize these detail messages. 1015 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1016 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1017 1018 msg = java_lang_String::create_from_str("Metadata space", CHECK_false); 1019 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1020 msg = java_lang_String::create_from_str("Class Metadata space", CHECK_false); 1021 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1022 1023 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1024 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1025 1026 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1027 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1028 1029 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1030 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1031 1032 // Setup the array of errors that have preallocated backtrace 1033 k = Universe::_out_of_memory_error_java_heap->klass(); 1034 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1035 k_h = instanceKlassHandle(THREAD, k); 1036 1037 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1038 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 1039 for (int i=0; i<len; i++) { 1040 oop err = k_h->allocate_instance(CHECK_false); 1041 Handle err_h = Handle(THREAD, err); 1042 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1043 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1044 } 1045 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1046 } 1047 1048 1049 // Setup static method for registering finalizers 1050 // The finalizer klass must be linked before looking up the method, in 1051 // case it needs to get rewritten. 1052 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); 1053 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( 1054 vmSymbols::register_method_name(), 1055 vmSymbols::register_method_signature()); 1056 if (m == NULL || !m->is_static()) { 1057 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1058 "java.lang.ref.Finalizer.register", false); 1059 } 1060 Universe::_finalizer_register_cache->init( 1061 SystemDictionary::Finalizer_klass(), m, CHECK_false); 1062 1063 // Resolve on first use and initialize class. 1064 // Note: No race-condition here, since a resolve will always return the same result 1065 1066 // Setup method for security checks 1067 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_reflect_Method(), true, CHECK_false); 1068 k_h = instanceKlassHandle(THREAD, k); 1069 k_h->link_class(CHECK_false); 1070 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_object_array_object_signature()); 1071 if (m == NULL || m->is_static()) { 1072 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1073 "java.lang.reflect.Method.invoke", false); 1074 } 1075 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false); 1076 1077 // Setup method for registering loaded classes in class loader vector 1078 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); 1079 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1080 if (m == NULL || m->is_static()) { 1081 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1082 "java.lang.ClassLoader.addClass", false); 1083 } 1084 Universe::_loader_addClass_cache->init( 1085 SystemDictionary::ClassLoader_klass(), m, CHECK_false); 1086 1087 // Setup method for checking protection domain 1088 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false); 1089 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())-> 1090 find_method(vmSymbols::impliesCreateAccessControlContext_name(), 1091 vmSymbols::void_boolean_signature()); 1092 // Allow NULL which should only happen with bootstrapping. 1093 if (m != NULL) { 1094 if (m->is_static()) { 1095 // NoSuchMethodException doesn't actually work because it tries to run the 1096 // <init> function before java_lang_Class is linked. Print error and exit. 1097 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); 1098 return false; // initialization failed 1099 } 1100 Universe::_pd_implies_cache->init( 1101 SystemDictionary::ProtectionDomain_klass(), m, CHECK_false);; 1102 } 1103 1104 // The folowing is initializing converter functions for serialization in 1105 // JVM.cpp. If we clean up the StrictMath code above we may want to find 1106 // a better solution for this as well. 1107 initialize_converter_functions(); 1108 1109 // This needs to be done before the first scavenge/gc, since 1110 // it's an input to soft ref clearing policy. 1111 { 1112 MutexLocker x(Heap_lock); 1113 Universe::update_heap_info_at_gc(); 1114 } 1115 1116 // ("weak") refs processing infrastructure initialization 1117 Universe::heap()->post_initialize(); 1118 1119 // Initialize performance counters for metaspaces 1120 MetaspaceCounters::initialize_performance_counters(); 1121 MemoryService::add_metaspace_memory_pools(); 1122 1123 GC_locker::unlock(); // allow gc after bootstrapping 1124 1125 MemoryService::set_universe_heap(Universe::_collectedHeap); 1126 return true; 1127 } 1128 1129 1130 void Universe::compute_base_vtable_size() { 1131 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1132 } 1133 1134 1135 // %%% The Universe::flush_foo methods belong in CodeCache. 1136 1137 // Flushes compiled methods dependent on dependee. 1138 void Universe::flush_dependents_on(instanceKlassHandle dependee) { 1139 assert_lock_strong(Compile_lock); 1140 1141 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1142 1143 // CodeCache can only be updated by a thread_in_VM and they will all be 1144 // stopped dring the safepoint so CodeCache will be safe to update without 1145 // holding the CodeCache_lock. 1146 1147 KlassDepChange changes(dependee); 1148 1149 // Compute the dependent nmethods 1150 if (CodeCache::mark_for_deoptimization(changes) > 0) { 1151 // At least one nmethod has been marked for deoptimization 1152 VM_Deoptimize op; 1153 VMThread::execute(&op); 1154 } 1155 } 1156 1157 // Flushes compiled methods dependent on a particular CallSite 1158 // instance when its target is different than the given MethodHandle. 1159 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) { 1160 assert_lock_strong(Compile_lock); 1161 1162 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1163 1164 // CodeCache can only be updated by a thread_in_VM and they will all be 1165 // stopped dring the safepoint so CodeCache will be safe to update without 1166 // holding the CodeCache_lock. 1167 1168 CallSiteDepChange changes(call_site(), method_handle()); 1169 1170 // Compute the dependent nmethods that have a reference to a 1171 // CallSite object. We use InstanceKlass::mark_dependent_nmethod 1172 // directly instead of CodeCache::mark_for_deoptimization because we 1173 // want dependents on the call site class only not all classes in 1174 // the ContextStream. 1175 int marked = 0; 1176 { 1177 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1178 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass()); 1179 marked = call_site_klass->mark_dependent_nmethods(changes); 1180 } 1181 if (marked > 0) { 1182 // At least one nmethod has been marked for deoptimization 1183 VM_Deoptimize op; 1184 VMThread::execute(&op); 1185 } 1186 } 1187 1188 #ifdef HOTSWAP 1189 // Flushes compiled methods dependent on dependee in the evolutionary sense 1190 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { 1191 // --- Compile_lock is not held. However we are at a safepoint. 1192 assert_locked_or_safepoint(Compile_lock); 1193 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1194 1195 // CodeCache can only be updated by a thread_in_VM and they will all be 1196 // stopped dring the safepoint so CodeCache will be safe to update without 1197 // holding the CodeCache_lock. 1198 1199 // Compute the dependent nmethods 1200 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { 1201 // At least one nmethod has been marked for deoptimization 1202 1203 // All this already happens inside a VM_Operation, so we'll do all the work here. 1204 // Stuff copied from VM_Deoptimize and modified slightly. 1205 1206 // We do not want any GCs to happen while we are in the middle of this VM operation 1207 ResourceMark rm; 1208 DeoptimizationMarker dm; 1209 1210 // Deoptimize all activations depending on marked nmethods 1211 Deoptimization::deoptimize_dependents(); 1212 1213 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1214 CodeCache::make_marked_nmethods_not_entrant(); 1215 } 1216 } 1217 #endif // HOTSWAP 1218 1219 1220 // Flushes compiled methods dependent on dependee 1221 void Universe::flush_dependents_on_method(methodHandle m_h) { 1222 // --- Compile_lock is not held. However we are at a safepoint. 1223 assert_locked_or_safepoint(Compile_lock); 1224 1225 // CodeCache can only be updated by a thread_in_VM and they will all be 1226 // stopped dring the safepoint so CodeCache will be safe to update without 1227 // holding the CodeCache_lock. 1228 1229 // Compute the dependent nmethods 1230 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { 1231 // At least one nmethod has been marked for deoptimization 1232 1233 // All this already happens inside a VM_Operation, so we'll do all the work here. 1234 // Stuff copied from VM_Deoptimize and modified slightly. 1235 1236 // We do not want any GCs to happen while we are in the middle of this VM operation 1237 ResourceMark rm; 1238 DeoptimizationMarker dm; 1239 1240 // Deoptimize all activations depending on marked nmethods 1241 Deoptimization::deoptimize_dependents(); 1242 1243 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1244 CodeCache::make_marked_nmethods_not_entrant(); 1245 } 1246 } 1247 1248 void Universe::print() { 1249 print_on(gclog_or_tty); 1250 } 1251 1252 void Universe::print_on(outputStream* st, bool extended) { 1253 st->print_cr("Heap"); 1254 if (!extended) { 1255 heap()->print_on(st); 1256 } else { 1257 heap()->print_extended_on(st); 1258 } 1259 } 1260 1261 void Universe::print_heap_at_SIGBREAK() { 1262 if (PrintHeapAtSIGBREAK) { 1263 MutexLocker hl(Heap_lock); 1264 print_on(tty); 1265 tty->cr(); 1266 tty->flush(); 1267 } 1268 } 1269 1270 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1271 st->print_cr("{Heap before GC invocations=%u (full %u):", 1272 heap()->total_collections(), 1273 heap()->total_full_collections()); 1274 if (!PrintHeapAtGCExtended || ignore_extended) { 1275 heap()->print_on(st); 1276 } else { 1277 heap()->print_extended_on(st); 1278 } 1279 } 1280 1281 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1282 st->print_cr("Heap after GC invocations=%u (full %u):", 1283 heap()->total_collections(), 1284 heap()->total_full_collections()); 1285 if (!PrintHeapAtGCExtended || ignore_extended) { 1286 heap()->print_on(st); 1287 } else { 1288 heap()->print_extended_on(st); 1289 } 1290 st->print_cr("}"); 1291 } 1292 1293 void Universe::verify(VerifyOption option, const char* prefix, bool silent) { 1294 // The use of _verify_in_progress is a temporary work around for 1295 // 6320749. Don't bother with a creating a class to set and clear 1296 // it since it is only used in this method and the control flow is 1297 // straight forward. 1298 _verify_in_progress = true; 1299 1300 COMPILER2_PRESENT( 1301 assert(!DerivedPointerTable::is_active(), 1302 "DPT should not be active during verification " 1303 "(of thread stacks below)"); 1304 ) 1305 1306 ResourceMark rm; 1307 HandleMark hm; // Handles created during verification can be zapped 1308 _verify_count++; 1309 1310 if (!silent) gclog_or_tty->print(prefix); 1311 if (!silent) gclog_or_tty->print("[Verifying "); 1312 if (!silent) gclog_or_tty->print("threads "); 1313 Threads::verify(); 1314 if (!silent) gclog_or_tty->print("heap "); 1315 heap()->verify(silent, option); 1316 if (!silent) gclog_or_tty->print("syms "); 1317 SymbolTable::verify(); 1318 if (!silent) gclog_or_tty->print("strs "); 1319 StringTable::verify(); 1320 { 1321 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1322 if (!silent) gclog_or_tty->print("zone "); 1323 CodeCache::verify(); 1324 } 1325 if (!silent) gclog_or_tty->print("dict "); 1326 SystemDictionary::verify(); 1327 #ifndef PRODUCT 1328 if (!silent) gclog_or_tty->print("cldg "); 1329 ClassLoaderDataGraph::verify(); 1330 #endif 1331 if (!silent) gclog_or_tty->print("metaspace chunks "); 1332 MetaspaceAux::verify_free_chunks(); 1333 if (!silent) gclog_or_tty->print("hand "); 1334 JNIHandles::verify(); 1335 if (!silent) gclog_or_tty->print("C-heap "); 1336 os::check_heap(); 1337 if (!silent) gclog_or_tty->print("code cache "); 1338 CodeCache::verify_oops(); 1339 if (!silent) gclog_or_tty->print_cr("]"); 1340 1341 _verify_in_progress = false; 1342 } 1343 1344 // Oop verification (see MacroAssembler::verify_oop) 1345 1346 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; 1347 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; 1348 1349 1350 #ifndef PRODUCT 1351 1352 static void calculate_verify_data(uintptr_t verify_data[2], 1353 HeapWord* low_boundary, 1354 HeapWord* high_boundary) { 1355 assert(low_boundary < high_boundary, "bad interval"); 1356 1357 // decide which low-order bits we require to be clear: 1358 size_t alignSize = MinObjAlignmentInBytes; 1359 size_t min_object_size = CollectedHeap::min_fill_size(); 1360 1361 // make an inclusive limit: 1362 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1363 uintptr_t min = (uintptr_t)low_boundary; 1364 assert(min < max, "bad interval"); 1365 uintptr_t diff = max ^ min; 1366 1367 // throw away enough low-order bits to make the diff vanish 1368 uintptr_t mask = (uintptr_t)(-1); 1369 while ((mask & diff) != 0) 1370 mask <<= 1; 1371 uintptr_t bits = (min & mask); 1372 assert(bits == (max & mask), "correct mask"); 1373 // check an intermediate value between min and max, just to make sure: 1374 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1375 1376 // require address alignment, too: 1377 mask |= (alignSize - 1); 1378 1379 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { 1380 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); 1381 } 1382 verify_data[0] = mask; 1383 verify_data[1] = bits; 1384 } 1385 1386 // Oop verification (see MacroAssembler::verify_oop) 1387 1388 uintptr_t Universe::verify_oop_mask() { 1389 MemRegion m = heap()->reserved_region(); 1390 calculate_verify_data(_verify_oop_data, 1391 m.start(), 1392 m.end()); 1393 return _verify_oop_data[0]; 1394 } 1395 1396 1397 1398 uintptr_t Universe::verify_oop_bits() { 1399 verify_oop_mask(); 1400 return _verify_oop_data[1]; 1401 } 1402 1403 uintptr_t Universe::verify_mark_mask() { 1404 return markOopDesc::lock_mask_in_place; 1405 } 1406 1407 uintptr_t Universe::verify_mark_bits() { 1408 intptr_t mask = verify_mark_mask(); 1409 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1410 assert((bits & ~mask) == 0, "no stray header bits"); 1411 return bits; 1412 } 1413 #endif // PRODUCT 1414 1415 1416 void Universe::compute_verify_oop_data() { 1417 verify_oop_mask(); 1418 verify_oop_bits(); 1419 verify_mark_mask(); 1420 verify_mark_bits(); 1421 } 1422 1423 1424 void CommonMethodOopCache::init(Klass* k, Method* m, TRAPS) { 1425 if (!UseSharedSpaces) { 1426 _klass = k; 1427 } 1428 #ifndef PRODUCT 1429 else { 1430 // sharing initilization should have already set up _klass 1431 assert(_klass != NULL, "just checking"); 1432 } 1433 #endif 1434 1435 _method_idnum = m->method_idnum(); 1436 assert(_method_idnum >= 0, "sanity check"); 1437 } 1438 1439 1440 ActiveMethodOopsCache::~ActiveMethodOopsCache() { 1441 if (_prev_methods != NULL) { 1442 delete _prev_methods; 1443 _prev_methods = NULL; 1444 } 1445 } 1446 1447 1448 void ActiveMethodOopsCache::add_previous_version(Method* method) { 1449 assert(Thread::current()->is_VM_thread(), 1450 "only VMThread can add previous versions"); 1451 1452 // Only append the previous method if it is executing on the stack. 1453 if (method->on_stack()) { 1454 1455 if (_prev_methods == NULL) { 1456 // This is the first previous version so make some space. 1457 // Start with 2 elements under the assumption that the class 1458 // won't be redefined much. 1459 _prev_methods = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Method*>(2, true); 1460 } 1461 1462 // RC_TRACE macro has an embedded ResourceMark 1463 RC_TRACE(0x00000100, 1464 ("add: %s(%s): adding prev version ref for cached method @%d", 1465 method->name()->as_C_string(), method->signature()->as_C_string(), 1466 _prev_methods->length())); 1467 1468 _prev_methods->append(method); 1469 } 1470 1471 1472 // Since the caller is the VMThread and we are at a safepoint, this is a good 1473 // time to clear out unused method references. 1474 1475 if (_prev_methods == NULL) return; 1476 1477 for (int i = _prev_methods->length() - 1; i >= 0; i--) { 1478 Method* method = _prev_methods->at(i); 1479 assert(method != NULL, "weak method ref was unexpectedly cleared"); 1480 1481 if (!method->on_stack()) { 1482 // This method isn't running anymore so remove it 1483 _prev_methods->remove_at(i); 1484 MetadataFactory::free_metadata(method->method_holder()->class_loader_data(), method); 1485 } else { 1486 // RC_TRACE macro has an embedded ResourceMark 1487 RC_TRACE(0x00000400, 1488 ("add: %s(%s): previous cached method @%d is alive", 1489 method->name()->as_C_string(), method->signature()->as_C_string(), i)); 1490 } 1491 } 1492 } // end add_previous_version() 1493 1494 1495 bool ActiveMethodOopsCache::is_same_method(const Method* method) const { 1496 InstanceKlass* ik = InstanceKlass::cast(klass()); 1497 const Method* check_method = ik->method_with_idnum(method_idnum()); 1498 assert(check_method != NULL, "sanity check"); 1499 if (check_method == method) { 1500 // done with the easy case 1501 return true; 1502 } 1503 1504 if (_prev_methods != NULL) { 1505 // The cached method has been redefined at least once so search 1506 // the previous versions for a match. 1507 for (int i = 0; i < _prev_methods->length(); i++) { 1508 check_method = _prev_methods->at(i); 1509 if (check_method == method) { 1510 // a previous version matches 1511 return true; 1512 } 1513 } 1514 } 1515 1516 // either no previous versions or no previous version matched 1517 return false; 1518 } 1519 1520 1521 Method* LatestMethodOopCache::get_Method() { 1522 if (klass() == NULL) return NULL; 1523 InstanceKlass* ik = InstanceKlass::cast(klass()); 1524 Method* m = ik->method_with_idnum(method_idnum()); 1525 assert(m != NULL, "sanity check"); 1526 return m; 1527 } 1528 1529 1530 #ifdef ASSERT 1531 // Release dummy object(s) at bottom of heap 1532 bool Universe::release_fullgc_alot_dummy() { 1533 MutexLocker ml(FullGCALot_lock); 1534 if (_fullgc_alot_dummy_array != NULL) { 1535 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1536 // No more dummies to release, release entire array instead 1537 _fullgc_alot_dummy_array = NULL; 1538 return false; 1539 } 1540 if (!UseConcMarkSweepGC) { 1541 // Release dummy at bottom of old generation 1542 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1543 } 1544 // Release dummy at bottom of permanent generation 1545 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1546 } 1547 return true; 1548 } 1549 1550 #endif // ASSERT