universe.cpp revision 5965:bdd155477289
1103285Sikob/* 2103285Sikob * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3103285Sikob * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4103285Sikob * 5103285Sikob * This code is free software; you can redistribute it and/or modify it 6103285Sikob * under the terms of the GNU General Public License version 2 only, as 7103285Sikob * published by the Free Software Foundation. 8103285Sikob * 9103285Sikob * This code is distributed in the hope that it will be useful, but WITHOUT 10103285Sikob * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11103285Sikob * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12103285Sikob * version 2 for more details (a copy is included in the LICENSE file that 13103285Sikob * accompanied this code). 14103285Sikob * 15103285Sikob * You should have received a copy of the GNU General Public License version 16103285Sikob * 2 along with this work; if not, write to the Free Software Foundation, 17103285Sikob * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18103285Sikob * 19103285Sikob * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20103285Sikob * or visit www.oracle.com if you need additional information or have any 21103285Sikob * questions. 22103285Sikob * 23103285Sikob */ 24103285Sikob 25103285Sikob#include "precompiled.hpp" 26103285Sikob#include "classfile/classLoader.hpp" 27103285Sikob#include "classfile/classLoaderData.hpp" 28103285Sikob#include "classfile/javaClasses.hpp" 29103285Sikob#include "classfile/symbolTable.hpp" 30103285Sikob#include "classfile/systemDictionary.hpp" 31103285Sikob#include "classfile/vmSymbols.hpp" 32103285Sikob#include "code/codeCache.hpp" 33103285Sikob#include "code/dependencies.hpp" 34103285Sikob#include "gc_interface/collectedHeap.inline.hpp" 35103285Sikob#include "interpreter/interpreter.hpp" 36103285Sikob#include "memory/cardTableModRefBS.hpp" 37103285Sikob#include "memory/gcLocker.inline.hpp" 38103285Sikob#include "memory/genCollectedHeap.hpp" 39103285Sikob#include "memory/genRemSet.hpp" 40103285Sikob#include "memory/generation.hpp" 41103285Sikob#include "memory/metadataFactory.hpp" 42103285Sikob#include "memory/metaspaceShared.hpp" 43103285Sikob#include "memory/oopFactory.hpp" 44103285Sikob#include "memory/space.hpp" 45103285Sikob#include "memory/universe.hpp" 46103285Sikob#include "memory/universe.inline.hpp" 47103285Sikob#include "oops/constantPool.hpp" 48103285Sikob#include "oops/instanceClassLoaderKlass.hpp" 49103285Sikob#include "oops/instanceKlass.hpp" 50103285Sikob#include "oops/instanceMirrorKlass.hpp" 51103285Sikob#include "oops/instanceRefKlass.hpp" 52103285Sikob#include "oops/oop.inline.hpp" 53103285Sikob#include "oops/typeArrayKlass.hpp" 54103285Sikob#include "prims/jvmtiRedefineClassesTrace.hpp" 55103285Sikob#include "runtime/arguments.hpp" 56103285Sikob#include "runtime/deoptimization.hpp" 57103285Sikob#include "runtime/fprofiler.hpp" 58103285Sikob#include "runtime/handles.inline.hpp" 59103285Sikob#include "runtime/init.hpp" 60103285Sikob#include "runtime/java.hpp" 61103285Sikob#include "runtime/javaCalls.hpp" 62103285Sikob#include "runtime/sharedRuntime.hpp" 63103285Sikob#include "runtime/synchronizer.hpp" 64103285Sikob#include "runtime/thread.inline.hpp" 65103285Sikob#include "runtime/timer.hpp" 66103285Sikob#include "runtime/vm_operations.hpp" 67103285Sikob#include "services/memoryService.hpp" 68103285Sikob#include "utilities/copy.hpp" 69103285Sikob#include "utilities/events.hpp" 70103285Sikob#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 82Klass* Universe::_boolArrayKlassObj = NULL; 83Klass* Universe::_byteArrayKlassObj = NULL; 84Klass* Universe::_charArrayKlassObj = NULL; 85Klass* Universe::_intArrayKlassObj = NULL; 86Klass* Universe::_shortArrayKlassObj = NULL; 87Klass* Universe::_longArrayKlassObj = NULL; 88Klass* Universe::_singleArrayKlassObj = NULL; 89Klass* Universe::_doubleArrayKlassObj = NULL; 90Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 91Klass* Universe::_objectArrayKlassObj = NULL; 92oop Universe::_int_mirror = NULL; 93oop Universe::_float_mirror = NULL; 94oop Universe::_double_mirror = NULL; 95oop Universe::_byte_mirror = NULL; 96oop Universe::_bool_mirror = NULL; 97oop Universe::_char_mirror = NULL; 98oop Universe::_long_mirror = NULL; 99oop Universe::_short_mirror = NULL; 100oop Universe::_void_mirror = NULL; 101oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 102oop Universe::_main_thread_group = NULL; 103oop Universe::_system_thread_group = NULL; 104objArrayOop Universe::_the_empty_class_klass_array = NULL; 105Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 106oop Universe::_the_null_string = NULL; 107oop Universe::_the_min_jint_string = NULL; 108LatestMethodOopCache* Universe::_finalizer_register_cache = NULL; 109LatestMethodOopCache* Universe::_loader_addClass_cache = NULL; 110LatestMethodOopCache* Universe::_pd_implies_cache = NULL; 111ActiveMethodOopsCache* Universe::_reflect_invoke_cache = NULL; 112oop Universe::_out_of_memory_error_java_heap = NULL; 113oop Universe::_out_of_memory_error_metaspace = NULL; 114oop Universe::_out_of_memory_error_class_metaspace = NULL; 115oop Universe::_out_of_memory_error_array_size = NULL; 116oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 117objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 118volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 119bool Universe::_verify_in_progress = false; 120oop Universe::_null_ptr_exception_instance = NULL; 121oop Universe::_arithmetic_exception_instance = NULL; 122oop Universe::_virtual_machine_error_instance = NULL; 123oop Universe::_vm_exception = NULL; 124Array<int>* Universe::_the_empty_int_array = NULL; 125Array<u2>* Universe::_the_empty_short_array = NULL; 126Array<Klass*>* Universe::_the_empty_klass_array = NULL; 127Array<Method*>* Universe::_the_empty_method_array = NULL; 128 129// These variables are guarded by FullGCALot_lock. 130debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 131debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 132 133// Heap 134int Universe::_verify_count = 0; 135 136int Universe::_base_vtable_size = 0; 137bool Universe::_bootstrapping = false; 138bool Universe::_fully_initialized = false; 139 140size_t Universe::_heap_capacity_at_last_gc; 141size_t Universe::_heap_used_at_last_gc = 0; 142 143CollectedHeap* Universe::_collectedHeap = NULL; 144 145NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 146NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 147address Universe::_narrow_ptrs_base; 148 149size_t Universe::_class_metaspace_size; 150 151void Universe::basic_type_classes_do(void f(Klass*)) { 152 f(boolArrayKlassObj()); 153 f(byteArrayKlassObj()); 154 f(charArrayKlassObj()); 155 f(intArrayKlassObj()); 156 f(shortArrayKlassObj()); 157 f(longArrayKlassObj()); 158 f(singleArrayKlassObj()); 159 f(doubleArrayKlassObj()); 160} 161 162void Universe::oops_do(OopClosure* f, bool do_all) { 163 164 f->do_oop((oop*) &_int_mirror); 165 f->do_oop((oop*) &_float_mirror); 166 f->do_oop((oop*) &_double_mirror); 167 f->do_oop((oop*) &_byte_mirror); 168 f->do_oop((oop*) &_bool_mirror); 169 f->do_oop((oop*) &_char_mirror); 170 f->do_oop((oop*) &_long_mirror); 171 f->do_oop((oop*) &_short_mirror); 172 f->do_oop((oop*) &_void_mirror); 173 174 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 175 f->do_oop((oop*) &_mirrors[i]); 176 } 177 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 178 179 f->do_oop((oop*)&_the_empty_class_klass_array); 180 f->do_oop((oop*)&_the_null_string); 181 f->do_oop((oop*)&_the_min_jint_string); 182 f->do_oop((oop*)&_out_of_memory_error_java_heap); 183 f->do_oop((oop*)&_out_of_memory_error_metaspace); 184 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 185 f->do_oop((oop*)&_out_of_memory_error_array_size); 186 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 187 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 188 f->do_oop((oop*)&_null_ptr_exception_instance); 189 f->do_oop((oop*)&_arithmetic_exception_instance); 190 f->do_oop((oop*)&_virtual_machine_error_instance); 191 f->do_oop((oop*)&_main_thread_group); 192 f->do_oop((oop*)&_system_thread_group); 193 f->do_oop((oop*)&_vm_exception); 194 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 195} 196 197// Serialize metadata in and out of CDS archive, not oops. 198void Universe::serialize(SerializeClosure* f, bool do_all) { 199 200 f->do_ptr((void**)&_boolArrayKlassObj); 201 f->do_ptr((void**)&_byteArrayKlassObj); 202 f->do_ptr((void**)&_charArrayKlassObj); 203 f->do_ptr((void**)&_intArrayKlassObj); 204 f->do_ptr((void**)&_shortArrayKlassObj); 205 f->do_ptr((void**)&_longArrayKlassObj); 206 f->do_ptr((void**)&_singleArrayKlassObj); 207 f->do_ptr((void**)&_doubleArrayKlassObj); 208 f->do_ptr((void**)&_objectArrayKlassObj); 209 210 { 211 for (int i = 0; i < T_VOID+1; i++) { 212 if (_typeArrayKlassObjs[i] != NULL) { 213 assert(i >= T_BOOLEAN, "checking"); 214 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 215 } else if (do_all) { 216 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 217 } 218 } 219 } 220 221 f->do_ptr((void**)&_the_array_interfaces_array); 222 f->do_ptr((void**)&_the_empty_int_array); 223 f->do_ptr((void**)&_the_empty_short_array); 224 f->do_ptr((void**)&_the_empty_method_array); 225 f->do_ptr((void**)&_the_empty_klass_array); 226 _finalizer_register_cache->serialize(f); 227 _loader_addClass_cache->serialize(f); 228 _reflect_invoke_cache->serialize(f); 229 _pd_implies_cache->serialize(f); 230} 231 232void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 233 if (size < alignment || size % alignment != 0) { 234 vm_exit_during_initialization( 235 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 236 } 237} 238 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()); 536 s_h() != NULL; 537 s_h = KlassHandle(THREAD, s_h()->next_sibling())) { 538 reinitialize_vtable_of(s_h, CHECK); 539 } 540 } 541} 542 543 544void initialize_itable_for_klass(Klass* k, TRAPS) { 545 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 546} 547 548 549void Universe::reinitialize_itables(TRAPS) { 550 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 551 552} 553 554 555bool Universe::on_page_boundary(void* addr) { 556 return ((uintptr_t) addr) % os::vm_page_size() == 0; 557} 558 559 560bool Universe::should_fill_in_stack_trace(Handle throwable) { 561 // never attempt to fill in the stack trace of preallocated errors that do not have 562 // backtrace. These errors are kept alive forever and may be "re-used" when all 563 // preallocated errors with backtrace have been consumed. Also need to avoid 564 // a potential loop which could happen if an out of memory occurs when attempting 565 // to allocate the backtrace. 566 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 567 (throwable() != Universe::_out_of_memory_error_metaspace) && 568 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 569 (throwable() != Universe::_out_of_memory_error_array_size) && 570 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); 571} 572 573 574oop Universe::gen_out_of_memory_error(oop default_err) { 575 // generate an out of memory error: 576 // - if there is a preallocated error with backtrace available then return it wth 577 // a filled in stack trace. 578 // - if there are no preallocated errors with backtrace available then return 579 // an error without backtrace. 580 int next; 581 if (_preallocated_out_of_memory_error_avail_count > 0) { 582 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 583 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 584 } else { 585 next = -1; 586 } 587 if (next < 0) { 588 // all preallocated errors have been used. 589 // return default 590 return default_err; 591 } else { 592 // get the error object at the slot and set set it to NULL so that the 593 // array isn't keeping it alive anymore. 594 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 595 assert(exc != NULL, "slot has been used already"); 596 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 597 598 // use the message from the default error 599 oop msg = java_lang_Throwable::message(default_err); 600 assert(msg != NULL, "no message"); 601 java_lang_Throwable::set_message(exc, msg); 602 603 // populate the stack trace and return it. 604 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 605 return exc; 606 } 607} 608 609static intptr_t non_oop_bits = 0; 610 611void* Universe::non_oop_word() { 612 // Neither the high bits nor the low bits of this value is allowed 613 // to look like (respectively) the high or low bits of a real oop. 614 // 615 // High and low are CPU-specific notions, but low always includes 616 // the low-order bit. Since oops are always aligned at least mod 4, 617 // setting the low-order bit will ensure that the low half of the 618 // word will never look like that of a real oop. 619 // 620 // Using the OS-supplied non-memory-address word (usually 0 or -1) 621 // will take care of the high bits, however many there are. 622 623 if (non_oop_bits == 0) { 624 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 625 } 626 627 return (void*)non_oop_bits; 628} 629 630jint universe_init() { 631 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 632 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 633 "LogHeapWordSize is incorrect."); 634 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 635 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 636 "oop size is not not a multiple of HeapWord size"); 637 TraceTime timer("Genesis", TraceStartupTime); 638 GC_locker::lock(); // do not allow gc during bootstrapping 639 JavaClasses::compute_hard_coded_offsets(); 640 641 jint status = Universe::initialize_heap(); 642 if (status != JNI_OK) { 643 return status; 644 } 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 683static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); 684// 32Gb 685// OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes; 686 687char* 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 and the metaspace size are small enough to allow 700 // UnscaledNarrowOop then just use UnscaledNarrowOop. 701 } else if ((total_size <= OopEncodingHeapMax) && (mode != HeapBasedNarrowOop) && 702 (!UseCompressedKlassPointers || 703 (((OopEncodingHeapMax - heap_size) + Universe::class_metaspace_size()) <= KlassEncodingMetaspaceMax))) { 704 // We don't need to check the metaspace size here because it is always smaller 705 // than total_size. 706 if ((total_size <= NarrowOopHeapMax) && (mode == UnscaledNarrowOop) && 707 (Universe::narrow_oop_shift() == 0)) { 708 // Use 32-bits oops without encoding and 709 // place heap's top on the 4Gb boundary 710 base = (NarrowOopHeapMax - heap_size); 711 } else { 712 // Can't reserve with NarrowOopShift == 0 713 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 714 if (mode == UnscaledNarrowOop || 715 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { 716 // Use zero based compressed oops with encoding and 717 // place heap's top on the 32Gb boundary in case 718 // total_size > 4Gb or failed to reserve below 4Gb. 719 base = (OopEncodingHeapMax - heap_size); 720 } 721 } 722 723 // See if ZeroBaseNarrowOop encoding will work for a heap based at 724 // (KlassEncodingMetaspaceMax - class_metaspace_size()). 725 } else if (UseCompressedKlassPointers && (mode != HeapBasedNarrowOop) && 726 (Universe::class_metaspace_size() + HeapBaseMinAddress <= KlassEncodingMetaspaceMax) && 727 (KlassEncodingMetaspaceMax + heap_size - Universe::class_metaspace_size() <= OopEncodingHeapMax)) { 728 base = (KlassEncodingMetaspaceMax - Universe::class_metaspace_size()); 729 } else { 730 // UnscaledNarrowOop encoding didn't work, and no base was found for ZeroBasedOops or 731 // HeapBasedNarrowOop encoding was requested. So, can't reserve below 32Gb. 732 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 733 } 734 735 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks 736 // used in ReservedHeapSpace() constructors. 737 // The final values will be set in initialize_heap() below. 738 if ((base != 0) && ((base + heap_size) <= OopEncodingHeapMax) && 739 (!UseCompressedKlassPointers || (base + Universe::class_metaspace_size()) <= KlassEncodingMetaspaceMax)) { 740 // Use zero based compressed oops 741 Universe::set_narrow_oop_base(NULL); 742 // Don't need guard page for implicit checks in indexed 743 // addressing mode with zero based Compressed Oops. 744 Universe::set_narrow_oop_use_implicit_null_checks(true); 745 } else { 746 // Set to a non-NULL value so the ReservedSpace ctor computes 747 // the correct no-access prefix. 748 // The final value will be set in initialize_heap() below. 749 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); 750#if defined(_WIN64) || defined(AIX) 751 if (UseLargePages) { 752 // Cannot allocate guard pages for implicit checks in indexed 753 // addressing mode when large pages are specified on windows. 754 Universe::set_narrow_oop_use_implicit_null_checks(false); 755 } 756#endif // _WIN64 757 } 758 } 759#endif 760 return (char*)base; // also return NULL (don't care) for 32-bit VM 761} 762 763jint Universe::initialize_heap() { 764 765 if (UseParallelGC) { 766#if INCLUDE_ALL_GCS 767 Universe::_collectedHeap = new ParallelScavengeHeap(); 768#else // INCLUDE_ALL_GCS 769 fatal("UseParallelGC not supported in this VM."); 770#endif // INCLUDE_ALL_GCS 771 772 } else if (UseG1GC) { 773#if INCLUDE_ALL_GCS 774 G1CollectorPolicy* g1p = new G1CollectorPolicy(); 775 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); 776 Universe::_collectedHeap = g1h; 777#else // INCLUDE_ALL_GCS 778 fatal("UseG1GC not supported in java kernel vm."); 779#endif // INCLUDE_ALL_GCS 780 781 } else { 782 GenCollectorPolicy *gc_policy; 783 784 if (UseSerialGC) { 785 gc_policy = new MarkSweepPolicy(); 786 } else if (UseConcMarkSweepGC) { 787#if INCLUDE_ALL_GCS 788 if (UseAdaptiveSizePolicy) { 789 gc_policy = new ASConcurrentMarkSweepPolicy(); 790 } else { 791 gc_policy = new ConcurrentMarkSweepPolicy(); 792 } 793#else // INCLUDE_ALL_GCS 794 fatal("UseConcMarkSweepGC not supported in this VM."); 795#endif // INCLUDE_ALL_GCS 796 } else { // default old generation 797 gc_policy = new MarkSweepPolicy(); 798 } 799 800 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); 801 } 802 803 jint status = Universe::heap()->initialize(); 804 if (status != JNI_OK) { 805 return status; 806 } 807 808#ifdef _LP64 809 if (UseCompressedOops) { 810 // Subtract a page because something can get allocated at heap base. 811 // This also makes implicit null checking work, because the 812 // memory+1 page below heap_base needs to cause a signal. 813 // See needs_explicit_null_check. 814 // Only set the heap base for compressed oops because it indicates 815 // compressed oops for pstack code. 816 bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose); 817 if (verbose) { 818 tty->cr(); 819 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 820 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); 821 } 822 if (((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax) || 823 (UseCompressedKlassPointers && 824 ((uint64_t)Universe::heap()->base() + Universe::class_metaspace_size() > KlassEncodingMetaspaceMax))) { 825 // Can't reserve heap below 32Gb. 826 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap() 827 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 828#ifdef AIX 829 // There is no protected page before the heap. This assures all oops 830 // are decoded so that NULL is preserved, so this page will not be accessed. 831 Universe::set_narrow_oop_use_implicit_null_checks(false); 832#endif 833 if (verbose) { 834 tty->print(", %s: "PTR_FORMAT, 835 narrow_oop_mode_to_string(HeapBasedNarrowOop), 836 Universe::narrow_oop_base()); 837 } 838 } else { 839 Universe::set_narrow_oop_base(0); 840 if (verbose) { 841 tty->print(", %s", narrow_oop_mode_to_string(ZeroBasedNarrowOop)); 842 } 843#ifdef _WIN64 844 if (!Universe::narrow_oop_use_implicit_null_checks()) { 845 // Don't need guard page for implicit checks in indexed addressing 846 // mode with zero based Compressed Oops. 847 Universe::set_narrow_oop_use_implicit_null_checks(true); 848 } 849#endif // _WIN64 850 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { 851 // Can't reserve heap below 4Gb. 852 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 853 } else { 854 Universe::set_narrow_oop_shift(0); 855 if (verbose) { 856 tty->print(", %s", narrow_oop_mode_to_string(UnscaledNarrowOop)); 857 } 858 } 859 } 860 if (verbose) { 861 tty->cr(); 862 tty->cr(); 863 } 864 if (UseCompressedKlassPointers) { 865 Universe::set_narrow_klass_base(Universe::narrow_oop_base()); 866 Universe::set_narrow_klass_shift(MIN2(Universe::narrow_oop_shift(), LogKlassAlignmentInBytes)); 867 } 868 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 869 } 870 // Universe::narrow_oop_base() is one page below the metaspace 871 // base. The actual metaspace base depends on alignment constraints 872 // so we don't know its exact location here. 873 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - os::vm_page_size() - ClassMetaspaceSize) || 874 Universe::narrow_oop_base() == NULL, "invalid value"); 875 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 876 Universe::narrow_oop_shift() == 0, "invalid value"); 877#endif 878 879 // We will never reach the CATCH below since Exceptions::_throw will cause 880 // the VM to exit if an exception is thrown during initialization 881 882 if (UseTLAB) { 883 assert(Universe::heap()->supports_tlab_allocation(), 884 "Should support thread-local allocation buffers"); 885 ThreadLocalAllocBuffer::startup_initialization(); 886 } 887 return JNI_OK; 888} 889 890 891// Reserve the Java heap, which is now the same for all GCs. 892ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 893 // Add in the class metaspace area so the classes in the headers can 894 // be compressed the same as instances. 895 // Need to round class space size up because it's below the heap and 896 // the actual alignment depends on its size. 897 Universe::set_class_metaspace_size(align_size_up(ClassMetaspaceSize, alignment)); 898 size_t total_reserved = align_size_up(heap_size + Universe::class_metaspace_size(), alignment); 899 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 900 "heap size is too big for compressed oops"); 901 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); 902 903 ReservedHeapSpace total_rs(total_reserved, alignment, UseLargePages, addr); 904 905 if (UseCompressedOops) { 906 if (addr != NULL && !total_rs.is_reserved()) { 907 // Failed to reserve at specified address - the requested memory 908 // region is taken already, for example, by 'java' launcher. 909 // Try again to reserver heap higher. 910 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); 911 912 ReservedHeapSpace total_rs0(total_reserved, alignment, 913 UseLargePages, addr); 914 915 if (addr != NULL && !total_rs0.is_reserved()) { 916 // Failed to reserve at specified address again - give up. 917 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); 918 assert(addr == NULL, ""); 919 920 ReservedHeapSpace total_rs1(total_reserved, alignment, 921 UseLargePages, addr); 922 total_rs = total_rs1; 923 } else { 924 total_rs = total_rs0; 925 } 926 } 927 } 928 929 if (!total_rs.is_reserved()) { 930 vm_exit_during_initialization(err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", total_reserved/K)); 931 return total_rs; 932 } 933 934 // Split the reserved space into main Java heap and a space for 935 // classes so that they can be compressed using the same algorithm 936 // as compressed oops. If compress oops and compress klass ptrs are 937 // used we need the meta space first: if the alignment used for 938 // compressed oops is greater than the one used for compressed klass 939 // ptrs, a metadata space on top of the heap could become 940 // unreachable. 941 ReservedSpace class_rs = total_rs.first_part(Universe::class_metaspace_size()); 942 ReservedSpace heap_rs = total_rs.last_part(Universe::class_metaspace_size(), alignment); 943 Metaspace::initialize_class_space(class_rs); 944 945 if (UseCompressedOops) { 946 // Universe::initialize_heap() will reset this to NULL if unscaled 947 // or zero-based narrow oops are actually used. 948 address base = (address)(total_rs.base() - os::vm_page_size()); 949 Universe::set_narrow_oop_base(base); 950 } 951 return heap_rs; 952} 953 954 955// It's the caller's repsonsibility to ensure glitch-freedom 956// (if required). 957void Universe::update_heap_info_at_gc() { 958 _heap_capacity_at_last_gc = heap()->capacity(); 959 _heap_used_at_last_gc = heap()->used(); 960} 961 962 963const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 964 switch (mode) { 965 case UnscaledNarrowOop: 966 return "32-bits Oops"; 967 case ZeroBasedNarrowOop: 968 return "zero based Compressed Oops"; 969 case HeapBasedNarrowOop: 970 return "Compressed Oops with base"; 971 } 972 973 ShouldNotReachHere(); 974 return ""; 975} 976 977 978Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 979 if (narrow_oop_base() != 0) { 980 return HeapBasedNarrowOop; 981 } 982 983 if (narrow_oop_shift() != 0) { 984 return ZeroBasedNarrowOop; 985 } 986 987 return UnscaledNarrowOop; 988} 989 990 991void universe2_init() { 992 EXCEPTION_MARK; 993 Universe::genesis(CATCH); 994} 995 996 997// This function is defined in JVM.cpp 998extern void initialize_converter_functions(); 999 1000bool universe_post_init() { 1001 assert(!is_init_completed(), "Error: initialization not yet completed!"); 1002 Universe::_fully_initialized = true; 1003 EXCEPTION_MARK; 1004 { ResourceMark rm; 1005 Interpreter::initialize(); // needed for interpreter entry points 1006 if (!UseSharedSpaces) { 1007 HandleMark hm(THREAD); 1008 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 1009 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 1010 Universe::reinitialize_itables(CHECK_false); 1011 } 1012 } 1013 1014 HandleMark hm(THREAD); 1015 Klass* k; 1016 instanceKlassHandle k_h; 1017 // Setup preallocated empty java.lang.Class array 1018 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 1019 1020 // Setup preallocated OutOfMemoryError errors 1021 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 1022 k_h = instanceKlassHandle(THREAD, k); 1023 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 1024 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); 1025 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); 1026 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 1027 Universe::_out_of_memory_error_gc_overhead_limit = 1028 k_h->allocate_instance(CHECK_false); 1029 1030 // Setup preallocated NullPointerException 1031 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1032 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1033 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1034 // Setup preallocated ArithmeticException 1035 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1036 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1037 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1038 // Virtual Machine Error for when we get into a situation we can't resolve 1039 k = SystemDictionary::resolve_or_fail( 1040 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1041 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1042 if (!linked) { 1043 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1044 return false; // initialization failed 1045 } 1046 Universe::_virtual_machine_error_instance = 1047 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1048 1049 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1050 1051 if (!DumpSharedSpaces) { 1052 // These are the only Java fields that are currently set during shared space dumping. 1053 // We prefer to not handle this generally, so we always reinitialize these detail messages. 1054 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1055 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1056 1057 msg = java_lang_String::create_from_str("Metadata space", CHECK_false); 1058 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 1059 msg = java_lang_String::create_from_str("Class Metadata space", CHECK_false); 1060 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 1061 1062 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1063 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1064 1065 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1066 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1067 1068 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1069 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1070 1071 // Setup the array of errors that have preallocated backtrace 1072 k = Universe::_out_of_memory_error_java_heap->klass(); 1073 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1074 k_h = instanceKlassHandle(THREAD, k); 1075 1076 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1077 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 1078 for (int i=0; i<len; i++) { 1079 oop err = k_h->allocate_instance(CHECK_false); 1080 Handle err_h = Handle(THREAD, err); 1081 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1082 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1083 } 1084 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1085 } 1086 1087 1088 // Setup static method for registering finalizers 1089 // The finalizer klass must be linked before looking up the method, in 1090 // case it needs to get rewritten. 1091 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); 1092 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( 1093 vmSymbols::register_method_name(), 1094 vmSymbols::register_method_signature()); 1095 if (m == NULL || !m->is_static()) { 1096 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1097 "java.lang.ref.Finalizer.register", false); 1098 } 1099 Universe::_finalizer_register_cache->init( 1100 SystemDictionary::Finalizer_klass(), m, CHECK_false); 1101 1102 // Resolve on first use and initialize class. 1103 // Note: No race-condition here, since a resolve will always return the same result 1104 1105 // Setup method for security checks 1106 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_reflect_Method(), true, CHECK_false); 1107 k_h = instanceKlassHandle(THREAD, k); 1108 k_h->link_class(CHECK_false); 1109 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_object_array_object_signature()); 1110 if (m == NULL || m->is_static()) { 1111 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1112 "java.lang.reflect.Method.invoke", false); 1113 } 1114 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false); 1115 1116 // Setup method for registering loaded classes in class loader vector 1117 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); 1118 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1119 if (m == NULL || m->is_static()) { 1120 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1121 "java.lang.ClassLoader.addClass", false); 1122 } 1123 Universe::_loader_addClass_cache->init( 1124 SystemDictionary::ClassLoader_klass(), m, CHECK_false); 1125 1126 // Setup method for checking protection domain 1127 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false); 1128 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())-> 1129 find_method(vmSymbols::impliesCreateAccessControlContext_name(), 1130 vmSymbols::void_boolean_signature()); 1131 // Allow NULL which should only happen with bootstrapping. 1132 if (m != NULL) { 1133 if (m->is_static()) { 1134 // NoSuchMethodException doesn't actually work because it tries to run the 1135 // <init> function before java_lang_Class is linked. Print error and exit. 1136 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); 1137 return false; // initialization failed 1138 } 1139 Universe::_pd_implies_cache->init( 1140 SystemDictionary::ProtectionDomain_klass(), m, CHECK_false);; 1141 } 1142 1143 // The folowing is initializing converter functions for serialization in 1144 // JVM.cpp. If we clean up the StrictMath code above we may want to find 1145 // a better solution for this as well. 1146 initialize_converter_functions(); 1147 1148 // This needs to be done before the first scavenge/gc, since 1149 // it's an input to soft ref clearing policy. 1150 { 1151 MutexLocker x(Heap_lock); 1152 Universe::update_heap_info_at_gc(); 1153 } 1154 1155 // ("weak") refs processing infrastructure initialization 1156 Universe::heap()->post_initialize(); 1157 1158 // Initialize performance counters for metaspaces 1159 MetaspaceCounters::initialize_performance_counters(); 1160 MemoryService::add_metaspace_memory_pools(); 1161 1162 GC_locker::unlock(); // allow gc after bootstrapping 1163 1164 MemoryService::set_universe_heap(Universe::_collectedHeap); 1165 return true; 1166} 1167 1168 1169void Universe::compute_base_vtable_size() { 1170 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1171} 1172 1173 1174// %%% The Universe::flush_foo methods belong in CodeCache. 1175 1176// Flushes compiled methods dependent on dependee. 1177void Universe::flush_dependents_on(instanceKlassHandle dependee) { 1178 assert_lock_strong(Compile_lock); 1179 1180 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1181 1182 // CodeCache can only be updated by a thread_in_VM and they will all be 1183 // stopped dring the safepoint so CodeCache will be safe to update without 1184 // holding the CodeCache_lock. 1185 1186 KlassDepChange changes(dependee); 1187 1188 // Compute the dependent nmethods 1189 if (CodeCache::mark_for_deoptimization(changes) > 0) { 1190 // At least one nmethod has been marked for deoptimization 1191 VM_Deoptimize op; 1192 VMThread::execute(&op); 1193 } 1194} 1195 1196// Flushes compiled methods dependent on a particular CallSite 1197// instance when its target is different than the given MethodHandle. 1198void Universe::flush_dependents_on(Handle call_site, Handle method_handle) { 1199 assert_lock_strong(Compile_lock); 1200 1201 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1202 1203 // CodeCache can only be updated by a thread_in_VM and they will all be 1204 // stopped dring the safepoint so CodeCache will be safe to update without 1205 // holding the CodeCache_lock. 1206 1207 CallSiteDepChange changes(call_site(), method_handle()); 1208 1209 // Compute the dependent nmethods that have a reference to a 1210 // CallSite object. We use InstanceKlass::mark_dependent_nmethod 1211 // directly instead of CodeCache::mark_for_deoptimization because we 1212 // want dependents on the call site class only not all classes in 1213 // the ContextStream. 1214 int marked = 0; 1215 { 1216 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1217 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass()); 1218 marked = call_site_klass->mark_dependent_nmethods(changes); 1219 } 1220 if (marked > 0) { 1221 // At least one nmethod has been marked for deoptimization 1222 VM_Deoptimize op; 1223 VMThread::execute(&op); 1224 } 1225} 1226 1227#ifdef HOTSWAP 1228// Flushes compiled methods dependent on dependee in the evolutionary sense 1229void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { 1230 // --- Compile_lock is not held. However we are at a safepoint. 1231 assert_locked_or_safepoint(Compile_lock); 1232 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1233 1234 // CodeCache can only be updated by a thread_in_VM and they will all be 1235 // stopped dring the safepoint so CodeCache will be safe to update without 1236 // holding the CodeCache_lock. 1237 1238 // Compute the dependent nmethods 1239 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { 1240 // At least one nmethod has been marked for deoptimization 1241 1242 // All this already happens inside a VM_Operation, so we'll do all the work here. 1243 // Stuff copied from VM_Deoptimize and modified slightly. 1244 1245 // We do not want any GCs to happen while we are in the middle of this VM operation 1246 ResourceMark rm; 1247 DeoptimizationMarker dm; 1248 1249 // Deoptimize all activations depending on marked nmethods 1250 Deoptimization::deoptimize_dependents(); 1251 1252 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1253 CodeCache::make_marked_nmethods_not_entrant(); 1254 } 1255} 1256#endif // HOTSWAP 1257 1258 1259// Flushes compiled methods dependent on dependee 1260void Universe::flush_dependents_on_method(methodHandle m_h) { 1261 // --- Compile_lock is not held. However we are at a safepoint. 1262 assert_locked_or_safepoint(Compile_lock); 1263 1264 // CodeCache can only be updated by a thread_in_VM and they will all be 1265 // stopped dring the safepoint so CodeCache will be safe to update without 1266 // holding the CodeCache_lock. 1267 1268 // Compute the dependent nmethods 1269 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { 1270 // At least one nmethod has been marked for deoptimization 1271 1272 // All this already happens inside a VM_Operation, so we'll do all the work here. 1273 // Stuff copied from VM_Deoptimize and modified slightly. 1274 1275 // We do not want any GCs to happen while we are in the middle of this VM operation 1276 ResourceMark rm; 1277 DeoptimizationMarker dm; 1278 1279 // Deoptimize all activations depending on marked nmethods 1280 Deoptimization::deoptimize_dependents(); 1281 1282 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1283 CodeCache::make_marked_nmethods_not_entrant(); 1284 } 1285} 1286 1287void Universe::print() { 1288 print_on(gclog_or_tty); 1289} 1290 1291void Universe::print_on(outputStream* st, bool extended) { 1292 st->print_cr("Heap"); 1293 if (!extended) { 1294 heap()->print_on(st); 1295 } else { 1296 heap()->print_extended_on(st); 1297 } 1298} 1299 1300void Universe::print_heap_at_SIGBREAK() { 1301 if (PrintHeapAtSIGBREAK) { 1302 MutexLocker hl(Heap_lock); 1303 print_on(tty); 1304 tty->cr(); 1305 tty->flush(); 1306 } 1307} 1308 1309void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1310 st->print_cr("{Heap before GC invocations=%u (full %u):", 1311 heap()->total_collections(), 1312 heap()->total_full_collections()); 1313 if (!PrintHeapAtGCExtended || ignore_extended) { 1314 heap()->print_on(st); 1315 } else { 1316 heap()->print_extended_on(st); 1317 } 1318} 1319 1320void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1321 st->print_cr("Heap after GC invocations=%u (full %u):", 1322 heap()->total_collections(), 1323 heap()->total_full_collections()); 1324 if (!PrintHeapAtGCExtended || ignore_extended) { 1325 heap()->print_on(st); 1326 } else { 1327 heap()->print_extended_on(st); 1328 } 1329 st->print_cr("}"); 1330} 1331 1332void Universe::verify(VerifyOption option, const char* prefix, bool silent) { 1333 // The use of _verify_in_progress is a temporary work around for 1334 // 6320749. Don't bother with a creating a class to set and clear 1335 // it since it is only used in this method and the control flow is 1336 // straight forward. 1337 _verify_in_progress = true; 1338 1339 COMPILER2_PRESENT( 1340 assert(!DerivedPointerTable::is_active(), 1341 "DPT should not be active during verification " 1342 "(of thread stacks below)"); 1343 ) 1344 1345 ResourceMark rm; 1346 HandleMark hm; // Handles created during verification can be zapped 1347 _verify_count++; 1348 1349 if (!silent) gclog_or_tty->print(prefix); 1350 if (!silent) gclog_or_tty->print("[Verifying "); 1351 if (!silent) gclog_or_tty->print("threads "); 1352 Threads::verify(); 1353 if (!silent) gclog_or_tty->print("heap "); 1354 heap()->verify(silent, option); 1355 if (!silent) gclog_or_tty->print("syms "); 1356 SymbolTable::verify(); 1357 if (!silent) gclog_or_tty->print("strs "); 1358 StringTable::verify(); 1359 { 1360 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1361 if (!silent) gclog_or_tty->print("zone "); 1362 CodeCache::verify(); 1363 } 1364 if (!silent) gclog_or_tty->print("dict "); 1365 SystemDictionary::verify(); 1366#ifndef PRODUCT 1367 if (!silent) gclog_or_tty->print("cldg "); 1368 ClassLoaderDataGraph::verify(); 1369#endif 1370 if (!silent) gclog_or_tty->print("metaspace chunks "); 1371 MetaspaceAux::verify_free_chunks(); 1372 if (!silent) gclog_or_tty->print("hand "); 1373 JNIHandles::verify(); 1374 if (!silent) gclog_or_tty->print("C-heap "); 1375 os::check_heap(); 1376 if (!silent) gclog_or_tty->print("code cache "); 1377 CodeCache::verify_oops(); 1378 if (!silent) gclog_or_tty->print_cr("]"); 1379 1380 _verify_in_progress = false; 1381} 1382 1383// Oop verification (see MacroAssembler::verify_oop) 1384 1385static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; 1386static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; 1387 1388 1389#ifndef PRODUCT 1390 1391static void calculate_verify_data(uintptr_t verify_data[2], 1392 HeapWord* low_boundary, 1393 HeapWord* high_boundary) { 1394 assert(low_boundary < high_boundary, "bad interval"); 1395 1396 // decide which low-order bits we require to be clear: 1397 size_t alignSize = MinObjAlignmentInBytes; 1398 size_t min_object_size = CollectedHeap::min_fill_size(); 1399 1400 // make an inclusive limit: 1401 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1402 uintptr_t min = (uintptr_t)low_boundary; 1403 assert(min < max, "bad interval"); 1404 uintptr_t diff = max ^ min; 1405 1406 // throw away enough low-order bits to make the diff vanish 1407 uintptr_t mask = (uintptr_t)(-1); 1408 while ((mask & diff) != 0) 1409 mask <<= 1; 1410 uintptr_t bits = (min & mask); 1411 assert(bits == (max & mask), "correct mask"); 1412 // check an intermediate value between min and max, just to make sure: 1413 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1414 1415 // require address alignment, too: 1416 mask |= (alignSize - 1); 1417 1418 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { 1419 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); 1420 } 1421 verify_data[0] = mask; 1422 verify_data[1] = bits; 1423} 1424 1425// Oop verification (see MacroAssembler::verify_oop) 1426 1427uintptr_t Universe::verify_oop_mask() { 1428 MemRegion m = heap()->reserved_region(); 1429 calculate_verify_data(_verify_oop_data, 1430 m.start(), 1431 m.end()); 1432 return _verify_oop_data[0]; 1433} 1434 1435 1436 1437uintptr_t Universe::verify_oop_bits() { 1438 verify_oop_mask(); 1439 return _verify_oop_data[1]; 1440} 1441 1442uintptr_t Universe::verify_mark_mask() { 1443 return markOopDesc::lock_mask_in_place; 1444} 1445 1446uintptr_t Universe::verify_mark_bits() { 1447 intptr_t mask = verify_mark_mask(); 1448 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1449 assert((bits & ~mask) == 0, "no stray header bits"); 1450 return bits; 1451} 1452#endif // PRODUCT 1453 1454 1455void Universe::compute_verify_oop_data() { 1456 verify_oop_mask(); 1457 verify_oop_bits(); 1458 verify_mark_mask(); 1459 verify_mark_bits(); 1460} 1461 1462 1463void CommonMethodOopCache::init(Klass* k, Method* m, TRAPS) { 1464 if (!UseSharedSpaces) { 1465 _klass = k; 1466 } 1467#ifndef PRODUCT 1468 else { 1469 // sharing initilization should have already set up _klass 1470 assert(_klass != NULL, "just checking"); 1471 } 1472#endif 1473 1474 _method_idnum = m->method_idnum(); 1475 assert(_method_idnum >= 0, "sanity check"); 1476} 1477 1478 1479ActiveMethodOopsCache::~ActiveMethodOopsCache() { 1480 if (_prev_methods != NULL) { 1481 delete _prev_methods; 1482 _prev_methods = NULL; 1483 } 1484} 1485 1486 1487void ActiveMethodOopsCache::add_previous_version(Method* method) { 1488 assert(Thread::current()->is_VM_thread(), 1489 "only VMThread can add previous versions"); 1490 1491 // Only append the previous method if it is executing on the stack. 1492 if (method->on_stack()) { 1493 1494 if (_prev_methods == NULL) { 1495 // This is the first previous version so make some space. 1496 // Start with 2 elements under the assumption that the class 1497 // won't be redefined much. 1498 _prev_methods = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Method*>(2, true); 1499 } 1500 1501 // RC_TRACE macro has an embedded ResourceMark 1502 RC_TRACE(0x00000100, 1503 ("add: %s(%s): adding prev version ref for cached method @%d", 1504 method->name()->as_C_string(), method->signature()->as_C_string(), 1505 _prev_methods->length())); 1506 1507 _prev_methods->append(method); 1508 } 1509 1510 1511 // Since the caller is the VMThread and we are at a safepoint, this is a good 1512 // time to clear out unused method references. 1513 1514 if (_prev_methods == NULL) return; 1515 1516 for (int i = _prev_methods->length() - 1; i >= 0; i--) { 1517 Method* method = _prev_methods->at(i); 1518 assert(method != NULL, "weak method ref was unexpectedly cleared"); 1519 1520 if (!method->on_stack()) { 1521 // This method isn't running anymore so remove it 1522 _prev_methods->remove_at(i); 1523 MetadataFactory::free_metadata(method->method_holder()->class_loader_data(), method); 1524 } else { 1525 // RC_TRACE macro has an embedded ResourceMark 1526 RC_TRACE(0x00000400, 1527 ("add: %s(%s): previous cached method @%d is alive", 1528 method->name()->as_C_string(), method->signature()->as_C_string(), i)); 1529 } 1530 } 1531} // end add_previous_version() 1532 1533 1534bool ActiveMethodOopsCache::is_same_method(const Method* method) const { 1535 InstanceKlass* ik = InstanceKlass::cast(klass()); 1536 const Method* check_method = ik->method_with_idnum(method_idnum()); 1537 assert(check_method != NULL, "sanity check"); 1538 if (check_method == method) { 1539 // done with the easy case 1540 return true; 1541 } 1542 1543 if (_prev_methods != NULL) { 1544 // The cached method has been redefined at least once so search 1545 // the previous versions for a match. 1546 for (int i = 0; i < _prev_methods->length(); i++) { 1547 check_method = _prev_methods->at(i); 1548 if (check_method == method) { 1549 // a previous version matches 1550 return true; 1551 } 1552 } 1553 } 1554 1555 // either no previous versions or no previous version matched 1556 return false; 1557} 1558 1559 1560Method* LatestMethodOopCache::get_Method() { 1561 if (klass() == NULL) return NULL; 1562 InstanceKlass* ik = InstanceKlass::cast(klass()); 1563 Method* m = ik->method_with_idnum(method_idnum()); 1564 assert(m != NULL, "sanity check"); 1565 return m; 1566} 1567 1568 1569#ifdef ASSERT 1570// Release dummy object(s) at bottom of heap 1571bool Universe::release_fullgc_alot_dummy() { 1572 MutexLocker ml(FullGCALot_lock); 1573 if (_fullgc_alot_dummy_array != NULL) { 1574 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1575 // No more dummies to release, release entire array instead 1576 _fullgc_alot_dummy_array = NULL; 1577 return false; 1578 } 1579 if (!UseConcMarkSweepGC) { 1580 // Release dummy at bottom of old generation 1581 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1582 } 1583 // Release dummy at bottom of permanent generation 1584 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1585 } 1586 return true; 1587} 1588 1589#endif // ASSERT 1590