universe.cpp revision 4454:cc32ccaaf47f
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 83Klass* Universe::_boolArrayKlassObj = NULL; 84Klass* Universe::_byteArrayKlassObj = NULL; 85Klass* Universe::_charArrayKlassObj = NULL; 86Klass* Universe::_intArrayKlassObj = NULL; 87Klass* Universe::_shortArrayKlassObj = NULL; 88Klass* Universe::_longArrayKlassObj = NULL; 89Klass* Universe::_singleArrayKlassObj = NULL; 90Klass* Universe::_doubleArrayKlassObj = NULL; 91Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 92Klass* Universe::_objectArrayKlassObj = NULL; 93oop Universe::_int_mirror = NULL; 94oop Universe::_float_mirror = NULL; 95oop Universe::_double_mirror = NULL; 96oop Universe::_byte_mirror = NULL; 97oop Universe::_bool_mirror = NULL; 98oop Universe::_char_mirror = NULL; 99oop Universe::_long_mirror = NULL; 100oop Universe::_short_mirror = NULL; 101oop Universe::_void_mirror = NULL; 102oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 103oop Universe::_main_thread_group = NULL; 104oop Universe::_system_thread_group = NULL; 105objArrayOop Universe::_the_empty_class_klass_array = NULL; 106Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 107oop Universe::_the_null_string = NULL; 108oop Universe::_the_min_jint_string = NULL; 109LatestMethodOopCache* Universe::_finalizer_register_cache = NULL; 110LatestMethodOopCache* Universe::_loader_addClass_cache = NULL; 111ActiveMethodOopsCache* Universe::_reflect_invoke_cache = NULL; 112oop Universe::_out_of_memory_error_java_heap = NULL; 113oop Universe::_out_of_memory_error_perm_gen = NULL; 114oop Universe::_out_of_memory_error_array_size = NULL; 115oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 116objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 117volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 118bool Universe::_verify_in_progress = false; 119oop Universe::_null_ptr_exception_instance = NULL; 120oop Universe::_arithmetic_exception_instance = NULL; 121oop Universe::_virtual_machine_error_instance = NULL; 122oop Universe::_vm_exception = NULL; 123Array<int>* Universe::_the_empty_int_array = NULL; 124Array<u2>* Universe::_the_empty_short_array = NULL; 125Array<Klass*>* Universe::_the_empty_klass_array = NULL; 126Array<Method*>* Universe::_the_empty_method_array = NULL; 127 128// These variables are guarded by FullGCALot_lock. 129debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 130debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 131 132// Heap 133int Universe::_verify_count = 0; 134 135int Universe::_base_vtable_size = 0; 136bool Universe::_bootstrapping = false; 137bool Universe::_fully_initialized = false; 138 139size_t Universe::_heap_capacity_at_last_gc; 140size_t Universe::_heap_used_at_last_gc = 0; 141 142CollectedHeap* Universe::_collectedHeap = NULL; 143 144NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 145NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 146address Universe::_narrow_ptrs_base; 147 148size_t Universe::_class_metaspace_size; 149 150void 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 161void 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. 196void 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 229void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 230 if (size < alignment || size % alignment != 0) { 231 ResourceMark rm; 232 stringStream st; 233 st.print("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment); 234 char* error = st.as_string(); 235 vm_exit_during_initialization(error); 236 } 237} 238 239void initialize_basic_type_klass(Klass* k, TRAPS) { 240 Klass* ok = SystemDictionary::Object_klass(); 241 if (UseSharedSpaces) { 242 assert(k->super() == ok, "u3"); 243 k->restore_unshareable_info(CHECK); 244 } else { 245 k->initialize_supers(ok, CHECK); 246 } 247 k->append_to_sibling_list(); 248} 249 250void Universe::genesis(TRAPS) { 251 ResourceMark rm; 252 253 { FlagSetting fs(_bootstrapping, true); 254 255 { MutexLocker mc(Compile_lock); 256 257 // determine base vtable size; without that we cannot create the array klasses 258 compute_base_vtable_size(); 259 260 if (!UseSharedSpaces) { 261 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 262 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 263 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 264 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 265 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 266 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 267 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 268 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 269 270 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 271 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 272 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 273 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 274 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 275 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 276 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 277 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 278 279 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 280 281 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 282 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 283 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 284 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 285 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 286 } 287 } 288 289 vmSymbols::initialize(CHECK); 290 291 SystemDictionary::initialize(CHECK); 292 293 Klass* ok = SystemDictionary::Object_klass(); 294 295 _the_null_string = StringTable::intern("null", CHECK); 296 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 297 298 if (UseSharedSpaces) { 299 // Verify shared interfaces array. 300 assert(_the_array_interfaces_array->at(0) == 301 SystemDictionary::Cloneable_klass(), "u3"); 302 assert(_the_array_interfaces_array->at(1) == 303 SystemDictionary::Serializable_klass(), "u3"); 304 } else { 305 // Set up shared interfaces array. (Do this before supers are set up.) 306 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 307 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 308 } 309 310 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 311 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 312 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 313 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 314 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 315 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 316 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 317 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 318 } // end of core bootstrapping 319 320 // Maybe this could be lifted up now that object array can be initialized 321 // during the bootstrapping. 322 323 // OLD 324 // Initialize _objectArrayKlass after core bootstraping to make 325 // sure the super class is set up properly for _objectArrayKlass. 326 // --- 327 // NEW 328 // Since some of the old system object arrays have been converted to 329 // ordinary object arrays, _objectArrayKlass will be loaded when 330 // SystemDictionary::initialize(CHECK); is run. See the extra check 331 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 332 _objectArrayKlassObj = InstanceKlass:: 333 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 334 // OLD 335 // Add the class to the class hierarchy manually to make sure that 336 // its vtable is initialized after core bootstrapping is completed. 337 // --- 338 // New 339 // Have already been initialized. 340 _objectArrayKlassObj->append_to_sibling_list(); 341 342 // Compute is_jdk version flags. 343 // Only 1.3 or later has the java.lang.Shutdown class. 344 // Only 1.4 or later has the java.lang.CharSequence interface. 345 // Only 1.5 or later has the java.lang.management.MemoryUsage class. 346 if (JDK_Version::is_partially_initialized()) { 347 uint8_t jdk_version; 348 Klass* k = SystemDictionary::resolve_or_null( 349 vmSymbols::java_lang_management_MemoryUsage(), THREAD); 350 CLEAR_PENDING_EXCEPTION; // ignore exceptions 351 if (k == NULL) { 352 k = SystemDictionary::resolve_or_null( 353 vmSymbols::java_lang_CharSequence(), THREAD); 354 CLEAR_PENDING_EXCEPTION; // ignore exceptions 355 if (k == NULL) { 356 k = SystemDictionary::resolve_or_null( 357 vmSymbols::java_lang_Shutdown(), THREAD); 358 CLEAR_PENDING_EXCEPTION; // ignore exceptions 359 if (k == NULL) { 360 jdk_version = 2; 361 } else { 362 jdk_version = 3; 363 } 364 } else { 365 jdk_version = 4; 366 } 367 } else { 368 jdk_version = 5; 369 } 370 JDK_Version::fully_initialize(jdk_version); 371 } 372 373 #ifdef ASSERT 374 if (FullGCALot) { 375 // Allocate an array of dummy objects. 376 // We'd like these to be at the bottom of the old generation, 377 // so that when we free one and then collect, 378 // (almost) the whole heap moves 379 // and we find out if we actually update all the oops correctly. 380 // But we can't allocate directly in the old generation, 381 // so we allocate wherever, and hope that the first collection 382 // moves these objects to the bottom of the old generation. 383 // We can allocate directly in the permanent generation, so we do. 384 int size; 385 if (UseConcMarkSweepGC) { 386 warning("Using +FullGCALot with concurrent mark sweep gc " 387 "will not force all objects to relocate"); 388 size = FullGCALotDummies; 389 } else { 390 size = FullGCALotDummies * 2; 391 } 392 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 393 objArrayHandle dummy_array(THREAD, naked_array); 394 int i = 0; 395 while (i < size) { 396 // Allocate dummy in old generation 397 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); 398 dummy_array->obj_at_put(i++, dummy); 399 } 400 { 401 // Only modify the global variable inside the mutex. 402 // If we had a race to here, the other dummy_array instances 403 // and their elements just get dropped on the floor, which is fine. 404 MutexLocker ml(FullGCALot_lock); 405 if (_fullgc_alot_dummy_array == NULL) { 406 _fullgc_alot_dummy_array = dummy_array(); 407 } 408 } 409 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 410 } 411 #endif 412 413 // Initialize dependency array for null class loader 414 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 415 416} 417 418// CDS support for patching vtables in metadata in the shared archive. 419// All types inherited from Metadata have vtables, but not types inherited 420// from MetaspaceObj, because the latter does not have virtual functions. 421// If the metadata type has a vtable, it cannot be shared in the read-only 422// section of the CDS archive, because the vtable pointer is patched. 423static inline void add_vtable(void** list, int* n, void* o, int count) { 424 guarantee((*n) < count, "vtable list too small"); 425 void* vtable = dereference_vptr(o); 426 assert(*(void**)(vtable) != NULL, "invalid vtable"); 427 list[(*n)++] = vtable; 428} 429 430void Universe::init_self_patching_vtbl_list(void** list, int count) { 431 int n = 0; 432 { InstanceKlass o; add_vtable(list, &n, &o, count); } 433 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 434 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 435 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 436 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 437 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 438 { Method o; add_vtable(list, &n, &o, count); } 439 { ConstantPool o; add_vtable(list, &n, &o, count); } 440} 441 442void Universe::initialize_basic_type_mirrors(TRAPS) { 443 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 444 _int_mirror = 445 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 446 _float_mirror = 447 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 448 _double_mirror = 449 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 450 _byte_mirror = 451 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 452 _bool_mirror = 453 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 454 _char_mirror = 455 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 456 _long_mirror = 457 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 458 _short_mirror = 459 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 460 _void_mirror = 461 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 462 463 _mirrors[T_INT] = _int_mirror; 464 _mirrors[T_FLOAT] = _float_mirror; 465 _mirrors[T_DOUBLE] = _double_mirror; 466 _mirrors[T_BYTE] = _byte_mirror; 467 _mirrors[T_BOOLEAN] = _bool_mirror; 468 _mirrors[T_CHAR] = _char_mirror; 469 _mirrors[T_LONG] = _long_mirror; 470 _mirrors[T_SHORT] = _short_mirror; 471 _mirrors[T_VOID] = _void_mirror; 472 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); 473 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); 474} 475 476void Universe::fixup_mirrors(TRAPS) { 477 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 478 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 479 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 480 // that the number of objects allocated at this point is very small. 481 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 482 HandleMark hm(THREAD); 483 // Cache the start of the static fields 484 InstanceMirrorKlass::init_offset_of_static_fields(); 485 486 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 487 int list_length = list->length(); 488 for (int i = 0; i < list_length; i++) { 489 Klass* k = list->at(i); 490 assert(k->is_klass(), "List should only hold classes"); 491 EXCEPTION_MARK; 492 KlassHandle kh(THREAD, k); 493 java_lang_Class::fixup_mirror(kh, CATCH); 494} 495 delete java_lang_Class::fixup_mirror_list(); 496 java_lang_Class::set_fixup_mirror_list(NULL); 497} 498 499static bool has_run_finalizers_on_exit = false; 500 501void Universe::run_finalizers_on_exit() { 502 if (has_run_finalizers_on_exit) return; 503 has_run_finalizers_on_exit = true; 504 505 // Called on VM exit. This ought to be run in a separate thread. 506 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 507 { 508 PRESERVE_EXCEPTION_MARK; 509 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 510 JavaValue result(T_VOID); 511 JavaCalls::call_static( 512 &result, 513 finalizer_klass, 514 vmSymbols::run_finalizers_on_exit_name(), 515 vmSymbols::void_method_signature(), 516 THREAD 517 ); 518 // Ignore any pending exceptions 519 CLEAR_PENDING_EXCEPTION; 520 } 521} 522 523 524// initialize_vtable could cause gc if 525// 1) we specified true to initialize_vtable and 526// 2) this ran after gc was enabled 527// In case those ever change we use handles for oops 528void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 529 // init vtable of k and all subclasses 530 Klass* ko = k_h(); 531 klassVtable* vt = ko->vtable(); 532 if (vt) vt->initialize_vtable(false, CHECK); 533 if (ko->oop_is_instance()) { 534 InstanceKlass* ik = (InstanceKlass*)ko; 535 for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->next_sibling())) { 536 reinitialize_vtable_of(s_h, CHECK); 537 } 538 } 539} 540 541 542void initialize_itable_for_klass(Klass* k, TRAPS) { 543 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 544} 545 546 547void Universe::reinitialize_itables(TRAPS) { 548 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 549 550} 551 552 553bool Universe::on_page_boundary(void* addr) { 554 return ((uintptr_t) addr) % os::vm_page_size() == 0; 555} 556 557 558bool 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_perm_gen) && 566 (throwable() != Universe::_out_of_memory_error_array_size) && 567 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); 568} 569 570 571oop Universe::gen_out_of_memory_error(oop default_err) { 572 // generate an out of memory error: 573 // - if there is a preallocated error with backtrace available then return it wth 574 // a filled in stack trace. 575 // - if there are no preallocated errors with backtrace available then return 576 // an error without backtrace. 577 int next; 578 if (_preallocated_out_of_memory_error_avail_count > 0) { 579 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 580 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 581 } else { 582 next = -1; 583 } 584 if (next < 0) { 585 // all preallocated errors have been used. 586 // return default 587 return default_err; 588 } else { 589 // get the error object at the slot and set set it to NULL so that the 590 // array isn't keeping it alive anymore. 591 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 592 assert(exc != NULL, "slot has been used already"); 593 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 594 595 // use the message from the default error 596 oop msg = java_lang_Throwable::message(default_err); 597 assert(msg != NULL, "no message"); 598 java_lang_Throwable::set_message(exc, msg); 599 600 // populate the stack trace and return it. 601 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 602 return exc; 603 } 604} 605 606static intptr_t non_oop_bits = 0; 607 608void* Universe::non_oop_word() { 609 // Neither the high bits nor the low bits of this value is allowed 610 // to look like (respectively) the high or low bits of a real oop. 611 // 612 // High and low are CPU-specific notions, but low always includes 613 // the low-order bit. Since oops are always aligned at least mod 4, 614 // setting the low-order bit will ensure that the low half of the 615 // word will never look like that of a real oop. 616 // 617 // Using the OS-supplied non-memory-address word (usually 0 or -1) 618 // will take care of the high bits, however many there are. 619 620 if (non_oop_bits == 0) { 621 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 622 } 623 624 return (void*)non_oop_bits; 625} 626 627jint universe_init() { 628 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 629 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 630 "LogHeapWordSize is incorrect."); 631 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 632 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 633 "oop size is not not a multiple of HeapWord size"); 634 TraceTime timer("Genesis", TraceStartupTime); 635 GC_locker::lock(); // do not allow gc during bootstrapping 636 JavaClasses::compute_hard_coded_offsets(); 637 638 jint status = Universe::initialize_heap(); 639 if (status != JNI_OK) { 640 return status; 641 } 642 643 // Create memory for metadata. Must be after initializing heap for 644 // DumpSharedSpaces. 645 ClassLoaderData::init_null_class_loader_data(); 646 647 // We have a heap so create the Method* caches before 648 // Metaspace::initialize_shared_spaces() tries to populate them. 649 Universe::_finalizer_register_cache = new LatestMethodOopCache(); 650 Universe::_loader_addClass_cache = new LatestMethodOopCache(); 651 Universe::_reflect_invoke_cache = new ActiveMethodOopsCache(); 652 653 if (UseSharedSpaces) { 654 // Read the data structures supporting the shared spaces (shared 655 // system dictionary, symbol table, etc.). After that, access to 656 // the file (other than the mapped regions) is no longer needed, and 657 // the file is closed. Closing the file does not affect the 658 // currently mapped regions. 659 MetaspaceShared::initialize_shared_spaces(); 660 StringTable::create_table(); 661 } else { 662 SymbolTable::create_table(); 663 StringTable::create_table(); 664 ClassLoader::create_package_info_table(); 665 } 666 667 return JNI_OK; 668} 669 670// Choose the heap base address and oop encoding mode 671// when compressed oops are used: 672// Unscaled - Use 32-bits oops without encoding when 673// NarrowOopHeapBaseMin + heap_size < 4Gb 674// ZeroBased - Use zero based compressed oops with encoding when 675// NarrowOopHeapBaseMin + heap_size < 32Gb 676// HeapBased - Use compressed oops with heap base + encoding. 677 678// 4Gb 679static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); 680// 32Gb 681// OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes; 682 683char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) { 684 size_t base = 0; 685#ifdef _LP64 686 if (UseCompressedOops) { 687 assert(mode == UnscaledNarrowOop || 688 mode == ZeroBasedNarrowOop || 689 mode == HeapBasedNarrowOop, "mode is invalid"); 690 const size_t total_size = heap_size + HeapBaseMinAddress; 691 // Return specified base for the first request. 692 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { 693 base = HeapBaseMinAddress; 694 695 // If the total size and the metaspace size are small enough to allow 696 // UnscaledNarrowOop then just use UnscaledNarrowOop. 697 } else if ((total_size <= OopEncodingHeapMax) && (mode != HeapBasedNarrowOop) && 698 (!UseCompressedKlassPointers || 699 (((OopEncodingHeapMax - heap_size) + Universe::class_metaspace_size()) <= KlassEncodingMetaspaceMax))) { 700 // We don't need to check the metaspace size here because it is always smaller 701 // than total_size. 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 } 718 719 // See if ZeroBaseNarrowOop encoding will work for a heap based at 720 // (KlassEncodingMetaspaceMax - class_metaspace_size()). 721 } else if (UseCompressedKlassPointers && (mode != HeapBasedNarrowOop) && 722 (Universe::class_metaspace_size() + HeapBaseMinAddress <= KlassEncodingMetaspaceMax) && 723 (KlassEncodingMetaspaceMax + heap_size - Universe::class_metaspace_size() <= OopEncodingHeapMax)) { 724 base = (KlassEncodingMetaspaceMax - Universe::class_metaspace_size()); 725 } else { 726 // UnscaledNarrowOop encoding didn't work, and no base was found for ZeroBasedOops or 727 // HeapBasedNarrowOop encoding was requested. So, can't reserve below 32Gb. 728 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 729 } 730 731 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks 732 // used in ReservedHeapSpace() constructors. 733 // The final values will be set in initialize_heap() below. 734 if ((base != 0) && ((base + heap_size) <= OopEncodingHeapMax) && 735 (!UseCompressedKlassPointers || (base + Universe::class_metaspace_size()) <= KlassEncodingMetaspaceMax)) { 736 // Use zero based compressed oops 737 Universe::set_narrow_oop_base(NULL); 738 // Don't need guard page for implicit checks in indexed 739 // addressing mode with zero based Compressed Oops. 740 Universe::set_narrow_oop_use_implicit_null_checks(true); 741 } else { 742 // Set to a non-NULL value so the ReservedSpace ctor computes 743 // the correct no-access prefix. 744 // The final value will be set in initialize_heap() below. 745 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); 746#ifdef _WIN64 747 if (UseLargePages) { 748 // Cannot allocate guard pages for implicit checks in indexed 749 // addressing mode when large pages are specified on windows. 750 Universe::set_narrow_oop_use_implicit_null_checks(false); 751 } 752#endif // _WIN64 753 } 754 } 755#endif 756 return (char*)base; // also return NULL (don't care) for 32-bit VM 757} 758 759jint Universe::initialize_heap() { 760 761 if (UseParallelGC) { 762#if INCLUDE_ALL_GCS 763 Universe::_collectedHeap = new ParallelScavengeHeap(); 764#else // INCLUDE_ALL_GCS 765 fatal("UseParallelGC not supported in this VM."); 766#endif // INCLUDE_ALL_GCS 767 768 } else if (UseG1GC) { 769#if INCLUDE_ALL_GCS 770 G1CollectorPolicy* g1p = new G1CollectorPolicy(); 771 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); 772 Universe::_collectedHeap = g1h; 773#else // INCLUDE_ALL_GCS 774 fatal("UseG1GC not supported in java kernel vm."); 775#endif // INCLUDE_ALL_GCS 776 777 } else { 778 GenCollectorPolicy *gc_policy; 779 780 if (UseSerialGC) { 781 gc_policy = new MarkSweepPolicy(); 782 } else if (UseConcMarkSweepGC) { 783#if INCLUDE_ALL_GCS 784 if (UseAdaptiveSizePolicy) { 785 gc_policy = new ASConcurrentMarkSweepPolicy(); 786 } else { 787 gc_policy = new ConcurrentMarkSweepPolicy(); 788 } 789#else // INCLUDE_ALL_GCS 790 fatal("UseConcMarkSweepGC not supported in this VM."); 791#endif // INCLUDE_ALL_GCS 792 } else { // default old generation 793 gc_policy = new MarkSweepPolicy(); 794 } 795 796 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); 797 } 798 799 jint status = Universe::heap()->initialize(); 800 if (status != JNI_OK) { 801 return status; 802 } 803 804#ifdef _LP64 805 if (UseCompressedOops) { 806 // Subtract a page because something can get allocated at heap base. 807 // This also makes implicit null checking work, because the 808 // memory+1 page below heap_base needs to cause a signal. 809 // See needs_explicit_null_check. 810 // Only set the heap base for compressed oops because it indicates 811 // compressed oops for pstack code. 812 bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose); 813 if (verbose) { 814 tty->cr(); 815 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 816 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); 817 } 818 if (((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax) || 819 (UseCompressedKlassPointers && 820 ((uint64_t)Universe::heap()->base() + Universe::class_metaspace_size() > KlassEncodingMetaspaceMax))) { 821 // Can't reserve heap below 32Gb. 822 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap() 823 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 824 if (verbose) { 825 tty->print(", Compressed Oops with base: "PTR_FORMAT, Universe::narrow_oop_base()); 826 } 827 } else { 828 Universe::set_narrow_oop_base(0); 829 if (verbose) { 830 tty->print(", zero based Compressed Oops"); 831 } 832#ifdef _WIN64 833 if (!Universe::narrow_oop_use_implicit_null_checks()) { 834 // Don't need guard page for implicit checks in indexed addressing 835 // mode with zero based Compressed Oops. 836 Universe::set_narrow_oop_use_implicit_null_checks(true); 837 } 838#endif // _WIN64 839 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { 840 // Can't reserve heap below 4Gb. 841 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 842 } else { 843 Universe::set_narrow_oop_shift(0); 844 if (verbose) { 845 tty->print(", 32-bits Oops"); 846 } 847 } 848 } 849 if (verbose) { 850 tty->cr(); 851 tty->cr(); 852 } 853 if (UseCompressedKlassPointers) { 854 Universe::set_narrow_klass_base(Universe::narrow_oop_base()); 855 Universe::set_narrow_klass_shift(MIN2(Universe::narrow_oop_shift(), LogKlassAlignmentInBytes)); 856 } 857 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 858 } 859 // Universe::narrow_oop_base() is one page below the metaspace 860 // base. The actual metaspace base depends on alignment constraints 861 // so we don't know its exact location here. 862 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - os::vm_page_size() - ClassMetaspaceSize) || 863 Universe::narrow_oop_base() == NULL, "invalid value"); 864 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 865 Universe::narrow_oop_shift() == 0, "invalid value"); 866#endif 867 868 // We will never reach the CATCH below since Exceptions::_throw will cause 869 // the VM to exit if an exception is thrown during initialization 870 871 if (UseTLAB) { 872 assert(Universe::heap()->supports_tlab_allocation(), 873 "Should support thread-local allocation buffers"); 874 ThreadLocalAllocBuffer::startup_initialization(); 875 } 876 return JNI_OK; 877} 878 879 880// Reserve the Java heap, which is now the same for all GCs. 881ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 882 // Add in the class metaspace area so the classes in the headers can 883 // be compressed the same as instances. 884 // Need to round class space size up because it's below the heap and 885 // the actual alignment depends on its size. 886 Universe::set_class_metaspace_size(align_size_up(ClassMetaspaceSize, alignment)); 887 size_t total_reserved = align_size_up(heap_size + Universe::class_metaspace_size(), alignment); 888 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 889 "heap size is too big for compressed oops"); 890 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); 891 892 ReservedHeapSpace total_rs(total_reserved, alignment, UseLargePages, addr); 893 894 if (UseCompressedOops) { 895 if (addr != NULL && !total_rs.is_reserved()) { 896 // Failed to reserve at specified address - the requested memory 897 // region is taken already, for example, by 'java' launcher. 898 // Try again to reserver heap higher. 899 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); 900 901 ReservedHeapSpace total_rs0(total_reserved, alignment, 902 UseLargePages, addr); 903 904 if (addr != NULL && !total_rs0.is_reserved()) { 905 // Failed to reserve at specified address again - give up. 906 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); 907 assert(addr == NULL, ""); 908 909 ReservedHeapSpace total_rs1(total_reserved, alignment, 910 UseLargePages, addr); 911 total_rs = total_rs1; 912 } else { 913 total_rs = total_rs0; 914 } 915 } 916 } 917 918 if (!total_rs.is_reserved()) { 919 vm_exit_during_initialization(err_msg("Could not reserve enough space for object heap %d bytes", total_reserved)); 920 return total_rs; 921 } 922 923 // Split the reserved space into main Java heap and a space for 924 // classes so that they can be compressed using the same algorithm 925 // as compressed oops. If compress oops and compress klass ptrs are 926 // used we need the meta space first: if the alignment used for 927 // compressed oops is greater than the one used for compressed klass 928 // ptrs, a metadata space on top of the heap could become 929 // unreachable. 930 ReservedSpace class_rs = total_rs.first_part(Universe::class_metaspace_size()); 931 ReservedSpace heap_rs = total_rs.last_part(Universe::class_metaspace_size(), alignment); 932 Metaspace::initialize_class_space(class_rs); 933 934 if (UseCompressedOops) { 935 // Universe::initialize_heap() will reset this to NULL if unscaled 936 // or zero-based narrow oops are actually used. 937 address base = (address)(total_rs.base() - os::vm_page_size()); 938 Universe::set_narrow_oop_base(base); 939 } 940 return heap_rs; 941} 942 943 944// It's the caller's repsonsibility to ensure glitch-freedom 945// (if required). 946void Universe::update_heap_info_at_gc() { 947 _heap_capacity_at_last_gc = heap()->capacity(); 948 _heap_used_at_last_gc = heap()->used(); 949} 950 951 952 953void universe2_init() { 954 EXCEPTION_MARK; 955 Universe::genesis(CATCH); 956 // Although we'd like to verify here that the state of the heap 957 // is good, we can't because the main thread has not yet added 958 // itself to the threads list (so, using current interfaces 959 // we can't "fill" its TLAB), unless TLABs are disabled. 960 if (VerifyBeforeGC && !UseTLAB && 961 Universe::heap()->total_collections() >= VerifyGCStartAt) { 962 Universe::heap()->prepare_for_verify(); 963 Universe::verify(); // make sure we're starting with a clean slate 964 } 965} 966 967 968// This function is defined in JVM.cpp 969extern void initialize_converter_functions(); 970 971bool universe_post_init() { 972 assert(!is_init_completed(), "Error: initialization not yet completed!"); 973 Universe::_fully_initialized = true; 974 EXCEPTION_MARK; 975 { ResourceMark rm; 976 Interpreter::initialize(); // needed for interpreter entry points 977 if (!UseSharedSpaces) { 978 HandleMark hm(THREAD); 979 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 980 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 981 Universe::reinitialize_itables(CHECK_false); 982 } 983 } 984 985 HandleMark hm(THREAD); 986 Klass* k; 987 instanceKlassHandle k_h; 988 // Setup preallocated empty java.lang.Class array 989 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 990 991 // Setup preallocated OutOfMemoryError errors 992 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 993 k_h = instanceKlassHandle(THREAD, k); 994 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 995 Universe::_out_of_memory_error_perm_gen = k_h->allocate_instance(CHECK_false); 996 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 997 Universe::_out_of_memory_error_gc_overhead_limit = 998 k_h->allocate_instance(CHECK_false); 999 1000 // Setup preallocated NullPointerException 1001 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1002 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1003 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1004 // Setup preallocated ArithmeticException 1005 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1006 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1007 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1008 // Virtual Machine Error for when we get into a situation we can't resolve 1009 k = SystemDictionary::resolve_or_fail( 1010 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1011 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1012 if (!linked) { 1013 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1014 return false; // initialization failed 1015 } 1016 Universe::_virtual_machine_error_instance = 1017 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1018 1019 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1020 1021 if (!DumpSharedSpaces) { 1022 // These are the only Java fields that are currently set during shared space dumping. 1023 // We prefer to not handle this generally, so we always reinitialize these detail messages. 1024 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1025 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1026 1027 msg = java_lang_String::create_from_str("Metadata space", CHECK_false); 1028 java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg()); 1029 1030 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1031 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1032 1033 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1034 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1035 1036 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1037 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1038 1039 // Setup the array of errors that have preallocated backtrace 1040 k = Universe::_out_of_memory_error_java_heap->klass(); 1041 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1042 k_h = instanceKlassHandle(THREAD, k); 1043 1044 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1045 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 1046 for (int i=0; i<len; i++) { 1047 oop err = k_h->allocate_instance(CHECK_false); 1048 Handle err_h = Handle(THREAD, err); 1049 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1050 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1051 } 1052 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1053 } 1054 1055 1056 // Setup static method for registering finalizers 1057 // The finalizer klass must be linked before looking up the method, in 1058 // case it needs to get rewritten. 1059 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); 1060 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( 1061 vmSymbols::register_method_name(), 1062 vmSymbols::register_method_signature()); 1063 if (m == NULL || !m->is_static()) { 1064 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1065 "java.lang.ref.Finalizer.register", false); 1066 } 1067 Universe::_finalizer_register_cache->init( 1068 SystemDictionary::Finalizer_klass(), m, CHECK_false); 1069 1070 // Resolve on first use and initialize class. 1071 // Note: No race-condition here, since a resolve will always return the same result 1072 1073 // Setup method for security checks 1074 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_reflect_Method(), true, CHECK_false); 1075 k_h = instanceKlassHandle(THREAD, k); 1076 k_h->link_class(CHECK_false); 1077 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_object_array_object_signature()); 1078 if (m == NULL || m->is_static()) { 1079 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1080 "java.lang.reflect.Method.invoke", false); 1081 } 1082 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false); 1083 1084 // Setup method for registering loaded classes in class loader vector 1085 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); 1086 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1087 if (m == NULL || m->is_static()) { 1088 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1089 "java.lang.ClassLoader.addClass", false); 1090 } 1091 Universe::_loader_addClass_cache->init( 1092 SystemDictionary::ClassLoader_klass(), m, CHECK_false); 1093 1094 // The folowing is initializing converter functions for serialization in 1095 // JVM.cpp. If we clean up the StrictMath code above we may want to find 1096 // a better solution for this as well. 1097 initialize_converter_functions(); 1098 1099 // This needs to be done before the first scavenge/gc, since 1100 // it's an input to soft ref clearing policy. 1101 { 1102 MutexLocker x(Heap_lock); 1103 Universe::update_heap_info_at_gc(); 1104 } 1105 1106 // ("weak") refs processing infrastructure initialization 1107 Universe::heap()->post_initialize(); 1108 1109 // Initialize performance counters for metaspaces 1110 MetaspaceCounters::initialize_performance_counters(); 1111 1112 GC_locker::unlock(); // allow gc after bootstrapping 1113 1114 MemoryService::set_universe_heap(Universe::_collectedHeap); 1115 return true; 1116} 1117 1118 1119void Universe::compute_base_vtable_size() { 1120 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1121} 1122 1123 1124// %%% The Universe::flush_foo methods belong in CodeCache. 1125 1126// Flushes compiled methods dependent on dependee. 1127void Universe::flush_dependents_on(instanceKlassHandle dependee) { 1128 assert_lock_strong(Compile_lock); 1129 1130 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1131 1132 // CodeCache can only be updated by a thread_in_VM and they will all be 1133 // stopped dring the safepoint so CodeCache will be safe to update without 1134 // holding the CodeCache_lock. 1135 1136 KlassDepChange changes(dependee); 1137 1138 // Compute the dependent nmethods 1139 if (CodeCache::mark_for_deoptimization(changes) > 0) { 1140 // At least one nmethod has been marked for deoptimization 1141 VM_Deoptimize op; 1142 VMThread::execute(&op); 1143 } 1144} 1145 1146// Flushes compiled methods dependent on a particular CallSite 1147// instance when its target is different than the given MethodHandle. 1148void Universe::flush_dependents_on(Handle call_site, Handle method_handle) { 1149 assert_lock_strong(Compile_lock); 1150 1151 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1152 1153 // CodeCache can only be updated by a thread_in_VM and they will all be 1154 // stopped dring the safepoint so CodeCache will be safe to update without 1155 // holding the CodeCache_lock. 1156 1157 CallSiteDepChange changes(call_site(), method_handle()); 1158 1159 // Compute the dependent nmethods that have a reference to a 1160 // CallSite object. We use InstanceKlass::mark_dependent_nmethod 1161 // directly instead of CodeCache::mark_for_deoptimization because we 1162 // want dependents on the call site class only not all classes in 1163 // the ContextStream. 1164 int marked = 0; 1165 { 1166 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1167 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass()); 1168 marked = call_site_klass->mark_dependent_nmethods(changes); 1169 } 1170 if (marked > 0) { 1171 // At least one nmethod has been marked for deoptimization 1172 VM_Deoptimize op; 1173 VMThread::execute(&op); 1174 } 1175} 1176 1177#ifdef HOTSWAP 1178// Flushes compiled methods dependent on dependee in the evolutionary sense 1179void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { 1180 // --- Compile_lock is not held. However we are at a safepoint. 1181 assert_locked_or_safepoint(Compile_lock); 1182 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1183 1184 // CodeCache can only be updated by a thread_in_VM and they will all be 1185 // stopped dring the safepoint so CodeCache will be safe to update without 1186 // holding the CodeCache_lock. 1187 1188 // Compute the dependent nmethods 1189 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { 1190 // At least one nmethod has been marked for deoptimization 1191 1192 // All this already happens inside a VM_Operation, so we'll do all the work here. 1193 // Stuff copied from VM_Deoptimize and modified slightly. 1194 1195 // We do not want any GCs to happen while we are in the middle of this VM operation 1196 ResourceMark rm; 1197 DeoptimizationMarker dm; 1198 1199 // Deoptimize all activations depending on marked nmethods 1200 Deoptimization::deoptimize_dependents(); 1201 1202 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1203 CodeCache::make_marked_nmethods_not_entrant(); 1204 } 1205} 1206#endif // HOTSWAP 1207 1208 1209// Flushes compiled methods dependent on dependee 1210void Universe::flush_dependents_on_method(methodHandle m_h) { 1211 // --- Compile_lock is not held. However we are at a safepoint. 1212 assert_locked_or_safepoint(Compile_lock); 1213 1214 // CodeCache can only be updated by a thread_in_VM and they will all be 1215 // stopped dring the safepoint so CodeCache will be safe to update without 1216 // holding the CodeCache_lock. 1217 1218 // Compute the dependent nmethods 1219 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { 1220 // At least one nmethod has been marked for deoptimization 1221 1222 // All this already happens inside a VM_Operation, so we'll do all the work here. 1223 // Stuff copied from VM_Deoptimize and modified slightly. 1224 1225 // We do not want any GCs to happen while we are in the middle of this VM operation 1226 ResourceMark rm; 1227 DeoptimizationMarker dm; 1228 1229 // Deoptimize all activations depending on marked nmethods 1230 Deoptimization::deoptimize_dependents(); 1231 1232 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1233 CodeCache::make_marked_nmethods_not_entrant(); 1234 } 1235} 1236 1237void Universe::print() { 1238 print_on(gclog_or_tty); 1239} 1240 1241void Universe::print_on(outputStream* st, bool extended) { 1242 st->print_cr("Heap"); 1243 if (!extended) { 1244 heap()->print_on(st); 1245 } else { 1246 heap()->print_extended_on(st); 1247 } 1248} 1249 1250void Universe::print_heap_at_SIGBREAK() { 1251 if (PrintHeapAtSIGBREAK) { 1252 MutexLocker hl(Heap_lock); 1253 print_on(tty); 1254 tty->cr(); 1255 tty->flush(); 1256 } 1257} 1258 1259void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1260 st->print_cr("{Heap before GC invocations=%u (full %u):", 1261 heap()->total_collections(), 1262 heap()->total_full_collections()); 1263 if (!PrintHeapAtGCExtended || ignore_extended) { 1264 heap()->print_on(st); 1265 } else { 1266 heap()->print_extended_on(st); 1267 } 1268} 1269 1270void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1271 st->print_cr("Heap after 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 st->print_cr("}"); 1280} 1281 1282void Universe::verify(bool silent, VerifyOption option) { 1283 // The use of _verify_in_progress is a temporary work around for 1284 // 6320749. Don't bother with a creating a class to set and clear 1285 // it since it is only used in this method and the control flow is 1286 // straight forward. 1287 _verify_in_progress = true; 1288 1289 COMPILER2_PRESENT( 1290 assert(!DerivedPointerTable::is_active(), 1291 "DPT should not be active during verification " 1292 "(of thread stacks below)"); 1293 ) 1294 1295 ResourceMark rm; 1296 HandleMark hm; // Handles created during verification can be zapped 1297 _verify_count++; 1298 1299 if (!silent) gclog_or_tty->print("[Verifying "); 1300 if (!silent) gclog_or_tty->print("threads "); 1301 Threads::verify(); 1302 heap()->verify(silent, option); 1303 1304 if (!silent) gclog_or_tty->print("syms "); 1305 SymbolTable::verify(); 1306 if (!silent) gclog_or_tty->print("strs "); 1307 StringTable::verify(); 1308 { 1309 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1310 if (!silent) gclog_or_tty->print("zone "); 1311 CodeCache::verify(); 1312 } 1313 if (!silent) gclog_or_tty->print("dict "); 1314 SystemDictionary::verify(); 1315#ifndef PRODUCT 1316 if (!silent) gclog_or_tty->print("cldg "); 1317 ClassLoaderDataGraph::verify(); 1318#endif 1319 if (!silent) gclog_or_tty->print("metaspace chunks "); 1320 MetaspaceAux::verify_free_chunks(); 1321 if (!silent) gclog_or_tty->print("hand "); 1322 JNIHandles::verify(); 1323 if (!silent) gclog_or_tty->print("C-heap "); 1324 os::check_heap(); 1325 if (!silent) gclog_or_tty->print("code cache "); 1326 CodeCache::verify_oops(); 1327 if (!silent) gclog_or_tty->print_cr("]"); 1328 1329 _verify_in_progress = false; 1330} 1331 1332// Oop verification (see MacroAssembler::verify_oop) 1333 1334static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; 1335static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; 1336 1337 1338#ifndef PRODUCT 1339 1340static void calculate_verify_data(uintptr_t verify_data[2], 1341 HeapWord* low_boundary, 1342 HeapWord* high_boundary) { 1343 assert(low_boundary < high_boundary, "bad interval"); 1344 1345 // decide which low-order bits we require to be clear: 1346 size_t alignSize = MinObjAlignmentInBytes; 1347 size_t min_object_size = CollectedHeap::min_fill_size(); 1348 1349 // make an inclusive limit: 1350 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1351 uintptr_t min = (uintptr_t)low_boundary; 1352 assert(min < max, "bad interval"); 1353 uintptr_t diff = max ^ min; 1354 1355 // throw away enough low-order bits to make the diff vanish 1356 uintptr_t mask = (uintptr_t)(-1); 1357 while ((mask & diff) != 0) 1358 mask <<= 1; 1359 uintptr_t bits = (min & mask); 1360 assert(bits == (max & mask), "correct mask"); 1361 // check an intermediate value between min and max, just to make sure: 1362 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1363 1364 // require address alignment, too: 1365 mask |= (alignSize - 1); 1366 1367 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { 1368 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); 1369 } 1370 verify_data[0] = mask; 1371 verify_data[1] = bits; 1372} 1373 1374// Oop verification (see MacroAssembler::verify_oop) 1375 1376uintptr_t Universe::verify_oop_mask() { 1377 MemRegion m = heap()->reserved_region(); 1378 calculate_verify_data(_verify_oop_data, 1379 m.start(), 1380 m.end()); 1381 return _verify_oop_data[0]; 1382} 1383 1384 1385 1386uintptr_t Universe::verify_oop_bits() { 1387 verify_oop_mask(); 1388 return _verify_oop_data[1]; 1389} 1390 1391uintptr_t Universe::verify_mark_mask() { 1392 return markOopDesc::lock_mask_in_place; 1393} 1394 1395uintptr_t Universe::verify_mark_bits() { 1396 intptr_t mask = verify_mark_mask(); 1397 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1398 assert((bits & ~mask) == 0, "no stray header bits"); 1399 return bits; 1400} 1401#endif // PRODUCT 1402 1403 1404void Universe::compute_verify_oop_data() { 1405 verify_oop_mask(); 1406 verify_oop_bits(); 1407 verify_mark_mask(); 1408 verify_mark_bits(); 1409} 1410 1411 1412void CommonMethodOopCache::init(Klass* k, Method* m, TRAPS) { 1413 if (!UseSharedSpaces) { 1414 _klass = k; 1415 } 1416#ifndef PRODUCT 1417 else { 1418 // sharing initilization should have already set up _klass 1419 assert(_klass != NULL, "just checking"); 1420 } 1421#endif 1422 1423 _method_idnum = m->method_idnum(); 1424 assert(_method_idnum >= 0, "sanity check"); 1425} 1426 1427 1428ActiveMethodOopsCache::~ActiveMethodOopsCache() { 1429 if (_prev_methods != NULL) { 1430 delete _prev_methods; 1431 _prev_methods = NULL; 1432 } 1433} 1434 1435 1436void ActiveMethodOopsCache::add_previous_version(Method* const method) { 1437 assert(Thread::current()->is_VM_thread(), 1438 "only VMThread can add previous versions"); 1439 1440 // Only append the previous method if it is executing on the stack. 1441 if (method->on_stack()) { 1442 1443 if (_prev_methods == NULL) { 1444 // This is the first previous version so make some space. 1445 // Start with 2 elements under the assumption that the class 1446 // won't be redefined much. 1447 _prev_methods = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Method*>(2, true); 1448 } 1449 1450 // RC_TRACE macro has an embedded ResourceMark 1451 RC_TRACE(0x00000100, 1452 ("add: %s(%s): adding prev version ref for cached method @%d", 1453 method->name()->as_C_string(), method->signature()->as_C_string(), 1454 _prev_methods->length())); 1455 1456 _prev_methods->append(method); 1457 } 1458 1459 1460 // Since the caller is the VMThread and we are at a safepoint, this is a good 1461 // time to clear out unused method references. 1462 1463 if (_prev_methods == NULL) return; 1464 1465 for (int i = _prev_methods->length() - 1; i >= 0; i--) { 1466 Method* method = _prev_methods->at(i); 1467 assert(method != NULL, "weak method ref was unexpectedly cleared"); 1468 1469 if (!method->on_stack()) { 1470 // This method isn't running anymore so remove it 1471 _prev_methods->remove_at(i); 1472 MetadataFactory::free_metadata(method->method_holder()->class_loader_data(), method); 1473 } else { 1474 // RC_TRACE macro has an embedded ResourceMark 1475 RC_TRACE(0x00000400, ("add: %s(%s): previous cached method @%d is alive", 1476 method->name()->as_C_string(), method->signature()->as_C_string(), i)); 1477 } 1478 } 1479} // end add_previous_version() 1480 1481 1482bool ActiveMethodOopsCache::is_same_method(Method* const method) const { 1483 InstanceKlass* ik = InstanceKlass::cast(klass()); 1484 Method* check_method = ik->method_with_idnum(method_idnum()); 1485 assert(check_method != NULL, "sanity check"); 1486 if (check_method == method) { 1487 // done with the easy case 1488 return true; 1489 } 1490 1491 if (_prev_methods != NULL) { 1492 // The cached method has been redefined at least once so search 1493 // the previous versions for a match. 1494 for (int i = 0; i < _prev_methods->length(); i++) { 1495 check_method = _prev_methods->at(i); 1496 if (check_method == method) { 1497 // a previous version matches 1498 return true; 1499 } 1500 } 1501 } 1502 1503 // either no previous versions or no previous version matched 1504 return false; 1505} 1506 1507 1508Method* LatestMethodOopCache::get_Method() { 1509 InstanceKlass* ik = InstanceKlass::cast(klass()); 1510 Method* m = ik->method_with_idnum(method_idnum()); 1511 assert(m != NULL, "sanity check"); 1512 return m; 1513} 1514 1515 1516#ifdef ASSERT 1517// Release dummy object(s) at bottom of heap 1518bool Universe::release_fullgc_alot_dummy() { 1519 MutexLocker ml(FullGCALot_lock); 1520 if (_fullgc_alot_dummy_array != NULL) { 1521 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1522 // No more dummies to release, release entire array instead 1523 _fullgc_alot_dummy_array = NULL; 1524 return false; 1525 } 1526 if (!UseConcMarkSweepGC) { 1527 // Release dummy at bottom of old generation 1528 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1529 } 1530 // Release dummy at bottom of permanent generation 1531 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1532 } 1533 return true; 1534} 1535 1536#endif // ASSERT 1537