rev 48545 : Value-based classes (vbc) / Oop value test via metadata ptr

   1 /*
   2  * Copyright (c) 1997, 2017, 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 "aot/aotLoader.hpp"
  27 #include "classfile/classLoader.hpp"
  28 #include "classfile/classLoaderData.hpp"
  29 #include "classfile/javaClasses.hpp"
  30 #include "classfile/stringTable.hpp"
  31 #include "classfile/systemDictionary.hpp"
  32 #include "classfile/vmSymbols.hpp"
  33 #include "code/codeCache.hpp"
  34 #include "code/dependencies.hpp"
  35 #include "gc/shared/cardTableModRefBS.hpp"
  36 #include "gc/shared/collectedHeap.inline.hpp"
  37 #include "gc/shared/gcArguments.hpp"
  38 #include "gc/shared/gcLocker.inline.hpp"
  39 #include "gc/shared/generation.hpp"
  40 #include "gc/shared/gcTraceTime.inline.hpp"
  41 #include "gc/shared/space.hpp"
  42 #include "interpreter/interpreter.hpp"
  43 #include "logging/log.hpp"
  44 #include "logging/logStream.hpp"
  45 #include "memory/filemap.hpp"
  46 #include "memory/metadataFactory.hpp"
  47 #include "memory/metaspaceClosure.hpp"
  48 #include "memory/metaspaceShared.hpp"
  49 #include "memory/oopFactory.hpp"
  50 #include "memory/resourceArea.hpp"
  51 #include "memory/universe.hpp"
  52 #include "memory/universe.inline.hpp"
  53 #include "oops/constantPool.hpp"
  54 #include "oops/instanceClassLoaderKlass.hpp"
  55 #include "oops/instanceKlass.hpp"
  56 #include "oops/instanceMirrorKlass.hpp"
  57 #include "oops/instanceRefKlass.hpp"
  58 #include "oops/objArrayOop.inline.hpp"
  59 #include "oops/oop.inline.hpp"
  60 #include "oops/typeArrayKlass.hpp"
  61 #include "prims/resolvedMethodTable.hpp"
  62 #include "runtime/arguments.hpp"
  63 #include "runtime/atomic.hpp"
  64 #include "runtime/commandLineFlagConstraintList.hpp"
  65 #include "runtime/deoptimization.hpp"
  66 #include "runtime/handles.inline.hpp"
  67 #include "runtime/init.hpp"
  68 #include "runtime/java.hpp"
  69 #include "runtime/javaCalls.hpp"
  70 #include "runtime/sharedRuntime.hpp"
  71 #include "runtime/synchronizer.hpp"
  72 #include "runtime/thread.inline.hpp"
  73 #include "runtime/timerTrace.hpp"
  74 #include "runtime/vm_operations.hpp"
  75 #include "services/memoryService.hpp"
  76 #include "utilities/align.hpp"
  77 #include "utilities/copy.hpp"
  78 #include "utilities/debug.hpp"
  79 #include "utilities/events.hpp"
  80 #include "utilities/formatBuffer.hpp"
  81 #include "utilities/hashtable.inline.hpp"
  82 #include "utilities/macros.hpp"
  83 #include "utilities/ostream.hpp"
  84 #include "utilities/preserveException.hpp"
  85 #if INCLUDE_CDS
  86 #include "classfile/sharedClassUtil.hpp"
  87 #endif
  88 
  89 // Known objects
  90 Klass* Universe::_boolArrayKlassObj                 = NULL;
  91 Klass* Universe::_byteArrayKlassObj                 = NULL;
  92 Klass* Universe::_charArrayKlassObj                 = NULL;
  93 Klass* Universe::_intArrayKlassObj                  = NULL;
  94 Klass* Universe::_shortArrayKlassObj                = NULL;
  95 Klass* Universe::_longArrayKlassObj                 = NULL;
  96 Klass* Universe::_singleArrayKlassObj               = NULL;
  97 Klass* Universe::_doubleArrayKlassObj               = NULL;
  98 Klass* Universe::_typeArrayKlassObjs[T_VOID+1]      = { NULL /*, NULL...*/ };
  99 Klass* Universe::_objectArrayKlassObj               = NULL;
 100 oop Universe::_int_mirror                             = NULL;
 101 oop Universe::_float_mirror                           = NULL;
 102 oop Universe::_double_mirror                          = NULL;
 103 oop Universe::_byte_mirror                            = NULL;
 104 oop Universe::_bool_mirror                            = NULL;
 105 oop Universe::_char_mirror                            = NULL;
 106 oop Universe::_long_mirror                            = NULL;
 107 oop Universe::_short_mirror                           = NULL;
 108 oop Universe::_void_mirror                            = NULL;
 109 oop Universe::_mirrors[T_VOID+1]                      = { NULL /*, NULL...*/ };
 110 oop Universe::_main_thread_group                      = NULL;
 111 oop Universe::_system_thread_group                    = NULL;
 112 objArrayOop Universe::_the_empty_class_klass_array    = NULL;
 113 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
 114 oop Universe::_the_null_string                        = NULL;
 115 oop Universe::_the_min_jint_string                   = NULL;
 116 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
 117 LatestMethodCache* Universe::_loader_addClass_cache    = NULL;
 118 LatestMethodCache* Universe::_pd_implies_cache         = NULL;
 119 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
 120 LatestMethodCache* Universe::_do_stack_walk_cache     = NULL;
 121 oop Universe::_out_of_memory_error_java_heap          = NULL;
 122 oop Universe::_out_of_memory_error_metaspace          = NULL;
 123 oop Universe::_out_of_memory_error_class_metaspace    = NULL;
 124 oop Universe::_out_of_memory_error_array_size         = NULL;
 125 oop Universe::_out_of_memory_error_gc_overhead_limit  = NULL;
 126 oop Universe::_out_of_memory_error_realloc_objects    = NULL;
 127 oop Universe::_delayed_stack_overflow_error_message   = NULL;
 128 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
 129 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
 130 bool Universe::_verify_in_progress                    = false;
 131 long Universe::verify_flags                           = Universe::Verify_All;
 132 oop Universe::_null_ptr_exception_instance            = NULL;
 133 oop Universe::_arithmetic_exception_instance          = NULL;
 134 oop Universe::_virtual_machine_error_instance         = NULL;
 135 oop Universe::_vm_exception                           = NULL;
 136 oop Universe::_allocation_context_notification_obj    = NULL;
 137 oop Universe::_reference_pending_list                 = NULL;
 138 
 139 Array<int>* Universe::_the_empty_int_array            = NULL;
 140 Array<u2>* Universe::_the_empty_short_array           = NULL;
 141 Array<Klass*>* Universe::_the_empty_klass_array     = NULL;
 142 Array<Method*>* Universe::_the_empty_method_array   = NULL;
 143 
 144 // These variables are guarded by FullGCALot_lock.
 145 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
 146 debug_only(int Universe::_fullgc_alot_dummy_next      = 0;)
 147 
 148 // Heap
 149 int             Universe::_verify_count = 0;
 150 
 151 // Oop verification (see MacroAssembler::verify_oop)
 152 uintptr_t       Universe::_verify_oop_mask = 0;
 153 uintptr_t       Universe::_verify_oop_bits = (uintptr_t) -1;
 154 
 155 int             Universe::_base_vtable_size = 0;
 156 bool            Universe::_bootstrapping = false;
 157 bool            Universe::_module_initialized = false;
 158 bool            Universe::_fully_initialized = false;
 159 
 160 size_t          Universe::_heap_capacity_at_last_gc;
 161 size_t          Universe::_heap_used_at_last_gc = 0;
 162 
 163 CollectedHeap*  Universe::_collectedHeap = NULL;
 164 
 165 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
 166 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
 167 address Universe::_narrow_ptrs_base;



 168 
 169 void Universe::basic_type_classes_do(void f(Klass*)) {
 170   f(boolArrayKlassObj());
 171   f(byteArrayKlassObj());
 172   f(charArrayKlassObj());
 173   f(intArrayKlassObj());
 174   f(shortArrayKlassObj());
 175   f(longArrayKlassObj());
 176   f(singleArrayKlassObj());
 177   f(doubleArrayKlassObj());
 178 }
 179 
 180 void Universe::oops_do(OopClosure* f, bool do_all) {
 181 
 182   f->do_oop((oop*) &_int_mirror);
 183   f->do_oop((oop*) &_float_mirror);
 184   f->do_oop((oop*) &_double_mirror);
 185   f->do_oop((oop*) &_byte_mirror);
 186   f->do_oop((oop*) &_bool_mirror);
 187   f->do_oop((oop*) &_char_mirror);
 188   f->do_oop((oop*) &_long_mirror);
 189   f->do_oop((oop*) &_short_mirror);
 190   f->do_oop((oop*) &_void_mirror);
 191 
 192   for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
 193     f->do_oop((oop*) &_mirrors[i]);
 194   }
 195   assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
 196 
 197   f->do_oop((oop*)&_the_empty_class_klass_array);
 198   f->do_oop((oop*)&_the_null_string);
 199   f->do_oop((oop*)&_the_min_jint_string);
 200   f->do_oop((oop*)&_out_of_memory_error_java_heap);
 201   f->do_oop((oop*)&_out_of_memory_error_metaspace);
 202   f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
 203   f->do_oop((oop*)&_out_of_memory_error_array_size);
 204   f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
 205   f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
 206   f->do_oop((oop*)&_delayed_stack_overflow_error_message);
 207   f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
 208   f->do_oop((oop*)&_null_ptr_exception_instance);
 209   f->do_oop((oop*)&_arithmetic_exception_instance);
 210   f->do_oop((oop*)&_virtual_machine_error_instance);
 211   f->do_oop((oop*)&_main_thread_group);
 212   f->do_oop((oop*)&_system_thread_group);
 213   f->do_oop((oop*)&_vm_exception);
 214   f->do_oop((oop*)&_allocation_context_notification_obj);
 215   f->do_oop((oop*)&_reference_pending_list);
 216   debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
 217 }
 218 
 219 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
 220   it->push(&_klass);
 221 }
 222 
 223 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
 224   it->push(&_boolArrayKlassObj);
 225   it->push(&_byteArrayKlassObj);
 226   it->push(&_charArrayKlassObj);
 227   it->push(&_intArrayKlassObj);
 228   it->push(&_shortArrayKlassObj);
 229   it->push(&_longArrayKlassObj);
 230   it->push(&_singleArrayKlassObj);
 231   it->push(&_doubleArrayKlassObj);
 232   for (int i = 0; i < T_VOID+1; i++) {
 233     it->push(&_typeArrayKlassObjs[i]);
 234   }
 235   it->push(&_objectArrayKlassObj);
 236 
 237   it->push(&_the_empty_int_array);
 238   it->push(&_the_empty_short_array);
 239   it->push(&_the_empty_klass_array);
 240   it->push(&_the_empty_method_array);
 241   it->push(&_the_array_interfaces_array);
 242 
 243   _finalizer_register_cache->metaspace_pointers_do(it);
 244   _loader_addClass_cache->metaspace_pointers_do(it);
 245   _pd_implies_cache->metaspace_pointers_do(it);
 246   _throw_illegal_access_error_cache->metaspace_pointers_do(it);
 247   _do_stack_walk_cache->metaspace_pointers_do(it);
 248 }
 249 
 250 // Serialize metadata in and out of CDS archive, not oops.
 251 void Universe::serialize(SerializeClosure* f, bool do_all) {
 252 
 253   f->do_ptr((void**)&_boolArrayKlassObj);
 254   f->do_ptr((void**)&_byteArrayKlassObj);
 255   f->do_ptr((void**)&_charArrayKlassObj);
 256   f->do_ptr((void**)&_intArrayKlassObj);
 257   f->do_ptr((void**)&_shortArrayKlassObj);
 258   f->do_ptr((void**)&_longArrayKlassObj);
 259   f->do_ptr((void**)&_singleArrayKlassObj);
 260   f->do_ptr((void**)&_doubleArrayKlassObj);
 261   f->do_ptr((void**)&_objectArrayKlassObj);
 262 
 263   {
 264     for (int i = 0; i < T_VOID+1; i++) {
 265       if (_typeArrayKlassObjs[i] != NULL) {
 266         assert(i >= T_BOOLEAN, "checking");
 267         f->do_ptr((void**)&_typeArrayKlassObjs[i]);
 268       } else if (do_all) {
 269         f->do_ptr((void**)&_typeArrayKlassObjs[i]);
 270       }
 271     }
 272   }
 273 
 274   f->do_ptr((void**)&_the_array_interfaces_array);
 275   f->do_ptr((void**)&_the_empty_int_array);
 276   f->do_ptr((void**)&_the_empty_short_array);
 277   f->do_ptr((void**)&_the_empty_method_array);
 278   f->do_ptr((void**)&_the_empty_klass_array);
 279   _finalizer_register_cache->serialize(f);
 280   _loader_addClass_cache->serialize(f);
 281   _pd_implies_cache->serialize(f);
 282   _throw_illegal_access_error_cache->serialize(f);
 283   _do_stack_walk_cache->serialize(f);
 284 }
 285 
 286 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
 287   if (size < alignment || size % alignment != 0) {
 288     vm_exit_during_initialization(
 289       err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
 290   }
 291 }
 292 
 293 void initialize_basic_type_klass(Klass* k, TRAPS) {
 294   Klass* ok = SystemDictionary::Object_klass();
 295 #if INCLUDE_CDS
 296   if (UseSharedSpaces) {
 297     ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
 298     assert(k->super() == ok, "u3");
 299     k->restore_unshareable_info(loader_data, Handle(), CHECK);
 300   } else
 301 #endif
 302   {
 303     k->initialize_supers(ok, CHECK);
 304   }
 305   k->append_to_sibling_list();
 306 }
 307 
 308 void Universe::genesis(TRAPS) {
 309   ResourceMark rm;
 310 
 311   { FlagSetting fs(_bootstrapping, true);
 312 
 313     { MutexLocker mc(Compile_lock);
 314 
 315       java_lang_Class::allocate_fixup_lists();
 316 
 317       // determine base vtable size; without that we cannot create the array klasses
 318       compute_base_vtable_size();
 319 
 320       if (!UseSharedSpaces) {
 321         _boolArrayKlassObj      = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
 322         _charArrayKlassObj      = TypeArrayKlass::create_klass(T_CHAR,    sizeof(jchar),    CHECK);
 323         _singleArrayKlassObj    = TypeArrayKlass::create_klass(T_FLOAT,   sizeof(jfloat),   CHECK);
 324         _doubleArrayKlassObj    = TypeArrayKlass::create_klass(T_DOUBLE,  sizeof(jdouble),  CHECK);
 325         _byteArrayKlassObj      = TypeArrayKlass::create_klass(T_BYTE,    sizeof(jbyte),    CHECK);
 326         _shortArrayKlassObj     = TypeArrayKlass::create_klass(T_SHORT,   sizeof(jshort),   CHECK);
 327         _intArrayKlassObj       = TypeArrayKlass::create_klass(T_INT,     sizeof(jint),     CHECK);
 328         _longArrayKlassObj      = TypeArrayKlass::create_klass(T_LONG,    sizeof(jlong),    CHECK);
 329 
 330         _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
 331         _typeArrayKlassObjs[T_CHAR]    = _charArrayKlassObj;
 332         _typeArrayKlassObjs[T_FLOAT]   = _singleArrayKlassObj;
 333         _typeArrayKlassObjs[T_DOUBLE]  = _doubleArrayKlassObj;
 334         _typeArrayKlassObjs[T_BYTE]    = _byteArrayKlassObj;
 335         _typeArrayKlassObjs[T_SHORT]   = _shortArrayKlassObj;
 336         _typeArrayKlassObjs[T_INT]     = _intArrayKlassObj;
 337         _typeArrayKlassObjs[T_LONG]    = _longArrayKlassObj;
 338 
 339         ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
 340 
 341         _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
 342         _the_empty_int_array        = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
 343         _the_empty_short_array      = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
 344         _the_empty_method_array     = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
 345         _the_empty_klass_array      = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
 346       }
 347     }
 348 
 349     vmSymbols::initialize(CHECK);
 350 
 351     SystemDictionary::initialize(CHECK);
 352 
 353     Klass* ok = SystemDictionary::Object_klass();
 354 
 355     _the_null_string            = StringTable::intern("null", CHECK);
 356     _the_min_jint_string       = StringTable::intern("-2147483648", CHECK);
 357 
 358 #if INCLUDE_CDS
 359     if (UseSharedSpaces) {
 360       // Verify shared interfaces array.
 361       assert(_the_array_interfaces_array->at(0) ==
 362              SystemDictionary::Cloneable_klass(), "u3");
 363       assert(_the_array_interfaces_array->at(1) ==
 364              SystemDictionary::Serializable_klass(), "u3");
 365       MetaspaceShared::fixup_mapped_heap_regions();
 366     } else
 367 #endif
 368     {
 369       // Set up shared interfaces array.  (Do this before supers are set up.)
 370       _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
 371       _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
 372     }
 373 
 374     initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
 375     initialize_basic_type_klass(charArrayKlassObj(), CHECK);
 376     initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
 377     initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
 378     initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
 379     initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
 380     initialize_basic_type_klass(intArrayKlassObj(), CHECK);
 381     initialize_basic_type_klass(longArrayKlassObj(), CHECK);
 382   } // end of core bootstrapping
 383 
 384   // Maybe this could be lifted up now that object array can be initialized
 385   // during the bootstrapping.
 386 
 387   // OLD
 388   // Initialize _objectArrayKlass after core bootstraping to make
 389   // sure the super class is set up properly for _objectArrayKlass.
 390   // ---
 391   // NEW
 392   // Since some of the old system object arrays have been converted to
 393   // ordinary object arrays, _objectArrayKlass will be loaded when
 394   // SystemDictionary::initialize(CHECK); is run. See the extra check
 395   // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
 396   _objectArrayKlassObj = InstanceKlass::
 397     cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
 398   // OLD
 399   // Add the class to the class hierarchy manually to make sure that
 400   // its vtable is initialized after core bootstrapping is completed.
 401   // ---
 402   // New
 403   // Have already been initialized.
 404   _objectArrayKlassObj->append_to_sibling_list();
 405 
 406   #ifdef ASSERT
 407   if (FullGCALot) {
 408     // Allocate an array of dummy objects.
 409     // We'd like these to be at the bottom of the old generation,
 410     // so that when we free one and then collect,
 411     // (almost) the whole heap moves
 412     // and we find out if we actually update all the oops correctly.
 413     // But we can't allocate directly in the old generation,
 414     // so we allocate wherever, and hope that the first collection
 415     // moves these objects to the bottom of the old generation.
 416     // We can allocate directly in the permanent generation, so we do.
 417     int size;
 418     if (UseConcMarkSweepGC) {
 419       log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
 420       size = FullGCALotDummies;
 421     } else {
 422       size = FullGCALotDummies * 2;
 423     }
 424     objArrayOop    naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
 425     objArrayHandle dummy_array(THREAD, naked_array);
 426     int i = 0;
 427     while (i < size) {
 428         // Allocate dummy in old generation
 429       oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
 430       dummy_array->obj_at_put(i++, dummy);
 431     }
 432     {
 433       // Only modify the global variable inside the mutex.
 434       // If we had a race to here, the other dummy_array instances
 435       // and their elements just get dropped on the floor, which is fine.
 436       MutexLocker ml(FullGCALot_lock);
 437       if (_fullgc_alot_dummy_array == NULL) {
 438         _fullgc_alot_dummy_array = dummy_array();
 439       }
 440     }
 441     assert(i == _fullgc_alot_dummy_array->length(), "just checking");
 442   }
 443   #endif
 444 
 445   // Initialize dependency array for null class loader
 446   ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
 447 
 448 }
 449 
 450 void Universe::initialize_basic_type_mirrors(TRAPS) {
 451     assert(_int_mirror==NULL, "basic type mirrors already initialized");
 452     _int_mirror     =
 453       java_lang_Class::create_basic_type_mirror("int",    T_INT, CHECK);
 454     _float_mirror   =
 455       java_lang_Class::create_basic_type_mirror("float",  T_FLOAT,   CHECK);
 456     _double_mirror  =
 457       java_lang_Class::create_basic_type_mirror("double", T_DOUBLE,  CHECK);
 458     _byte_mirror    =
 459       java_lang_Class::create_basic_type_mirror("byte",   T_BYTE, CHECK);
 460     _bool_mirror    =
 461       java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
 462     _char_mirror    =
 463       java_lang_Class::create_basic_type_mirror("char",   T_CHAR, CHECK);
 464     _long_mirror    =
 465       java_lang_Class::create_basic_type_mirror("long",   T_LONG, CHECK);
 466     _short_mirror   =
 467       java_lang_Class::create_basic_type_mirror("short",  T_SHORT,   CHECK);
 468     _void_mirror    =
 469       java_lang_Class::create_basic_type_mirror("void",   T_VOID, CHECK);
 470 
 471     _mirrors[T_INT]     = _int_mirror;
 472     _mirrors[T_FLOAT]   = _float_mirror;
 473     _mirrors[T_DOUBLE]  = _double_mirror;
 474     _mirrors[T_BYTE]    = _byte_mirror;
 475     _mirrors[T_BOOLEAN] = _bool_mirror;
 476     _mirrors[T_CHAR]    = _char_mirror;
 477     _mirrors[T_LONG]    = _long_mirror;
 478     _mirrors[T_SHORT]   = _short_mirror;
 479     _mirrors[T_VOID]    = _void_mirror;
 480   //_mirrors[T_OBJECT]  = _object_klass->java_mirror();
 481   //_mirrors[T_ARRAY]   = _object_klass->java_mirror();
 482 }
 483 
 484 void Universe::fixup_mirrors(TRAPS) {
 485   // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
 486   // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
 487   // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
 488   // that the number of objects allocated at this point is very small.
 489   assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
 490   HandleMark hm(THREAD);
 491   // Cache the start of the static fields
 492   InstanceMirrorKlass::init_offset_of_static_fields();
 493 
 494   GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
 495   int list_length = list->length();
 496   for (int i = 0; i < list_length; i++) {
 497     Klass* k = list->at(i);
 498     assert(k->is_klass(), "List should only hold classes");
 499     EXCEPTION_MARK;
 500     java_lang_Class::fixup_mirror(k, CATCH);
 501   }
 502   delete java_lang_Class::fixup_mirror_list();
 503   java_lang_Class::set_fixup_mirror_list(NULL);
 504 }
 505 
 506 #define assert_pll_locked(test) \
 507   assert(Heap_lock->test(), "Reference pending list access requires lock")
 508 
 509 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
 510 
 511 oop Universe::reference_pending_list() {
 512   if (Thread::current()->is_VM_thread()) {
 513     assert_pll_locked(is_locked);
 514   } else {
 515     assert_pll_ownership();
 516   }
 517   return _reference_pending_list;
 518 }
 519 
 520 void Universe::set_reference_pending_list(oop list) {
 521   assert_pll_ownership();
 522   _reference_pending_list = list;
 523 }
 524 
 525 bool Universe::has_reference_pending_list() {
 526   assert_pll_ownership();
 527   return _reference_pending_list != NULL;
 528 }
 529 
 530 oop Universe::swap_reference_pending_list(oop list) {
 531   assert_pll_locked(is_locked);
 532   return Atomic::xchg(list, &_reference_pending_list);
 533 }
 534 
 535 #undef assert_pll_locked
 536 #undef assert_pll_ownership
 537 
 538 
 539 static bool has_run_finalizers_on_exit = false;
 540 
 541 void Universe::run_finalizers_on_exit() {
 542   if (has_run_finalizers_on_exit) return;
 543   has_run_finalizers_on_exit = true;
 544 
 545   // Called on VM exit. This ought to be run in a separate thread.
 546   log_trace(ref)("Callback to run finalizers on exit");
 547   {
 548     PRESERVE_EXCEPTION_MARK;
 549     Klass* finalizer_klass = SystemDictionary::Finalizer_klass();
 550     JavaValue result(T_VOID);
 551     JavaCalls::call_static(
 552       &result,
 553       finalizer_klass,
 554       vmSymbols::run_finalizers_on_exit_name(),
 555       vmSymbols::void_method_signature(),
 556       THREAD
 557     );
 558     // Ignore any pending exceptions
 559     CLEAR_PENDING_EXCEPTION;
 560   }
 561 }
 562 
 563 
 564 // initialize_vtable could cause gc if
 565 // 1) we specified true to initialize_vtable and
 566 // 2) this ran after gc was enabled
 567 // In case those ever change we use handles for oops
 568 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
 569   // init vtable of k and all subclasses
 570   ko->vtable().initialize_vtable(false, CHECK);
 571   if (ko->is_instance_klass()) {
 572     for (Klass* sk = ko->subklass();
 573          sk != NULL;
 574          sk = sk->next_sibling()) {
 575       reinitialize_vtable_of(sk, CHECK);
 576     }
 577   }
 578 }
 579 
 580 
 581 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
 582   k->itable().initialize_itable(false, CHECK);
 583 }
 584 
 585 
 586 void Universe::reinitialize_itables(TRAPS) {
 587   ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
 588 }
 589 
 590 
 591 bool Universe::on_page_boundary(void* addr) {
 592   return is_aligned(addr, os::vm_page_size());
 593 }
 594 
 595 
 596 bool Universe::should_fill_in_stack_trace(Handle throwable) {
 597   // never attempt to fill in the stack trace of preallocated errors that do not have
 598   // backtrace. These errors are kept alive forever and may be "re-used" when all
 599   // preallocated errors with backtrace have been consumed. Also need to avoid
 600   // a potential loop which could happen if an out of memory occurs when attempting
 601   // to allocate the backtrace.
 602   return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
 603           (throwable() != Universe::_out_of_memory_error_metaspace)  &&
 604           (throwable() != Universe::_out_of_memory_error_class_metaspace)  &&
 605           (throwable() != Universe::_out_of_memory_error_array_size) &&
 606           (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
 607           (throwable() != Universe::_out_of_memory_error_realloc_objects));
 608 }
 609 
 610 
 611 oop Universe::gen_out_of_memory_error(oop default_err) {
 612   // generate an out of memory error:
 613   // - if there is a preallocated error and stack traces are available
 614   //   (j.l.Throwable is initialized), then return the preallocated
 615   //   error with a filled in stack trace, and with the message
 616   //   provided by the default error.
 617   // - otherwise, return the default error, without a stack trace.
 618   int next;
 619   if ((_preallocated_out_of_memory_error_avail_count > 0) &&
 620       SystemDictionary::Throwable_klass()->is_initialized()) {
 621     next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
 622     assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
 623   } else {
 624     next = -1;
 625   }
 626   if (next < 0) {
 627     // all preallocated errors have been used.
 628     // return default
 629     return default_err;
 630   } else {
 631     Thread* THREAD = Thread::current();
 632     Handle default_err_h(THREAD, default_err);
 633     // get the error object at the slot and set set it to NULL so that the
 634     // array isn't keeping it alive anymore.
 635     Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
 636     assert(exc() != NULL, "slot has been used already");
 637     preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
 638 
 639     // use the message from the default error
 640     oop msg = java_lang_Throwable::message(default_err_h());
 641     assert(msg != NULL, "no message");
 642     java_lang_Throwable::set_message(exc(), msg);
 643 
 644     // populate the stack trace and return it.
 645     java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
 646     return exc();
 647   }
 648 }
 649 
 650 intptr_t Universe::_non_oop_bits = 0;
 651 
 652 void* Universe::non_oop_word() {
 653   // Neither the high bits nor the low bits of this value is allowed
 654   // to look like (respectively) the high or low bits of a real oop.
 655   //
 656   // High and low are CPU-specific notions, but low always includes
 657   // the low-order bit.  Since oops are always aligned at least mod 4,
 658   // setting the low-order bit will ensure that the low half of the
 659   // word will never look like that of a real oop.
 660   //
 661   // Using the OS-supplied non-memory-address word (usually 0 or -1)
 662   // will take care of the high bits, however many there are.
 663 
 664   if (_non_oop_bits == 0) {
 665     _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
 666   }
 667 
 668   return (void*)_non_oop_bits;
 669 }
 670 
 671 jint universe_init() {
 672   assert(!Universe::_fully_initialized, "called after initialize_vtables");
 673   guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
 674          "LogHeapWordSize is incorrect.");
 675   guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
 676   guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
 677             "oop size is not not a multiple of HeapWord size");
 678 
 679   TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
 680 
 681   JavaClasses::compute_hard_coded_offsets();
 682 
 683   jint status = Universe::initialize_heap();
 684   if (status != JNI_OK) {
 685     return status;
 686   }
 687 
 688   Metaspace::global_initialize();
 689 
 690   // Initialize performance counters for metaspaces
 691   MetaspaceCounters::initialize_performance_counters();
 692   CompressedClassSpaceCounters::initialize_performance_counters();
 693 
 694   AOTLoader::universe_init();
 695 
 696   // Checks 'AfterMemoryInit' constraints.
 697   if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
 698     return JNI_EINVAL;
 699   }
 700 
 701   // Create memory for metadata.  Must be after initializing heap for
 702   // DumpSharedSpaces.
 703   ClassLoaderData::init_null_class_loader_data();
 704 
 705   // We have a heap so create the Method* caches before
 706   // Metaspace::initialize_shared_spaces() tries to populate them.
 707   Universe::_finalizer_register_cache = new LatestMethodCache();
 708   Universe::_loader_addClass_cache    = new LatestMethodCache();
 709   Universe::_pd_implies_cache         = new LatestMethodCache();
 710   Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
 711   Universe::_do_stack_walk_cache = new LatestMethodCache();
 712 
 713 #if INCLUDE_CDS
 714   if (UseSharedSpaces) {
 715     // Read the data structures supporting the shared spaces (shared
 716     // system dictionary, symbol table, etc.).  After that, access to
 717     // the file (other than the mapped regions) is no longer needed, and
 718     // the file is closed. Closing the file does not affect the
 719     // currently mapped regions.
 720     MetaspaceShared::initialize_shared_spaces();
 721     StringTable::create_table();
 722   } else
 723 #endif
 724   {
 725     SymbolTable::create_table();
 726     StringTable::create_table();
 727 
 728 #if INCLUDE_CDS
 729     if (DumpSharedSpaces) {
 730       MetaspaceShared::prepare_for_dumping();
 731     }
 732 #endif
 733   }
 734   if (strlen(VerifySubSet) > 0) {
 735     Universe::initialize_verify_flags();
 736   }
 737 
 738   ResolvedMethodTable::create_table();
 739 
 740   return JNI_OK;
 741 }
 742 
 743 CollectedHeap* Universe::create_heap() {
 744   assert(_collectedHeap == NULL, "Heap already created");
 745   assert(GCArguments::is_initialized(), "GC must be initialized here");
 746   return GCArguments::arguments()->create_heap();
 747 }
 748 
 749 // Choose the heap base address and oop encoding mode
 750 // when compressed oops are used:
 751 // Unscaled  - Use 32-bits oops without encoding when
 752 //     NarrowOopHeapBaseMin + heap_size < 4Gb
 753 // ZeroBased - Use zero based compressed oops with encoding when
 754 //     NarrowOopHeapBaseMin + heap_size < 32Gb
 755 // HeapBased - Use compressed oops with heap base + encoding.
 756 
 757 jint Universe::initialize_heap() {
 758   jint status = JNI_ERR;
 759 
 760   _collectedHeap = create_heap_ext();
 761   if (_collectedHeap == NULL) {
 762     _collectedHeap = create_heap();
 763   }
 764 
 765   status = _collectedHeap->initialize();
 766   if (status != JNI_OK) {
 767     return status;
 768   }
 769   log_info(gc)("Using %s", _collectedHeap->name());
 770 
 771   GCArguments::arguments()->post_heap_initialize();
 772   ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
 773 
 774 #ifdef _LP64
 775   if (UseCompressedOops) {
 776     // Subtract a page because something can get allocated at heap base.
 777     // This also makes implicit null checking work, because the
 778     // memory+1 page below heap_base needs to cause a signal.
 779     // See needs_explicit_null_check.
 780     // Only set the heap base for compressed oops because it indicates
 781     // compressed oops for pstack code.
 782     if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
 783       // Didn't reserve heap below 4Gb.  Must shift.
 784       Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
 785     }
 786     if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
 787       // Did reserve heap below 32Gb. Can use base == 0;
 788       Universe::set_narrow_oop_base(0);
 789     }
 790 
 791     Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
 792 
 793     LogTarget(Info, gc, heap, coops) lt;
 794     if (lt.is_enabled()) {
 795       ResourceMark rm;
 796       LogStream ls(lt);
 797       Universe::print_compressed_oops_mode(&ls);
 798     }
 799 
 800     // Tell tests in which mode we run.
 801     Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
 802                                                    narrow_oop_mode_to_string(narrow_oop_mode()),
 803                                                    false));
 804   }
 805   // Universe::narrow_oop_base() is one page below the heap.
 806   assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
 807          os::vm_page_size()) ||
 808          Universe::narrow_oop_base() == NULL, "invalid value");
 809   assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
 810          Universe::narrow_oop_shift() == 0, "invalid value");
 811 #endif
 812 
 813   // We will never reach the CATCH below since Exceptions::_throw will cause
 814   // the VM to exit if an exception is thrown during initialization
 815 
 816   if (UseTLAB) {
 817     assert(Universe::heap()->supports_tlab_allocation(),
 818            "Should support thread-local allocation buffers");
 819     ThreadLocalAllocBuffer::startup_initialization();
 820   }
 821   return JNI_OK;
 822 }
 823 
 824 void Universe::print_compressed_oops_mode(outputStream* st) {
 825   st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
 826             p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
 827 
 828   st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
 829 
 830   if (Universe::narrow_oop_base() != 0) {
 831     st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
 832   }
 833 
 834   if (Universe::narrow_oop_shift() != 0) {
 835     st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
 836   }
 837 
 838   if (!Universe::narrow_oop_use_implicit_null_checks()) {
 839     st->print(", no protected page in front of the heap");
 840   }
 841   st->cr();
 842 }
 843 
 844 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
 845 
 846   assert(alignment <= Arguments::conservative_max_heap_alignment(),
 847          "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
 848          alignment, Arguments::conservative_max_heap_alignment());
 849 
 850   size_t total_reserved = align_up(heap_size, alignment);
 851   assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
 852       "heap size is too big for compressed oops");
 853 
 854   bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
 855   assert(!UseLargePages
 856       || UseParallelGC
 857       || use_large_pages, "Wrong alignment to use large pages");
 858 
 859   // Now create the space.
 860   ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
 861 
 862   if (total_rs.is_reserved()) {
 863     assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
 864            "must be exactly of required size and alignment");
 865     // We are good.
 866 
 867     if (UseCompressedOops) {
 868       // Universe::initialize_heap() will reset this to NULL if unscaled
 869       // or zero-based narrow oops are actually used.
 870       // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
 871       Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
 872     }
 873 
 874     if (AllocateHeapAt != NULL) {
 875       log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
 876     }
 877     return total_rs;
 878   }
 879 
 880   vm_exit_during_initialization(
 881     err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
 882             total_reserved/K));
 883 
 884   // satisfy compiler
 885   ShouldNotReachHere();
 886   return ReservedHeapSpace(0, 0, false);
 887 }
 888 
 889 
 890 // It's the caller's responsibility to ensure glitch-freedom
 891 // (if required).
 892 void Universe::update_heap_info_at_gc() {
 893   _heap_capacity_at_last_gc = heap()->capacity();
 894   _heap_used_at_last_gc     = heap()->used();
 895 }
 896 
 897 
 898 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
 899   switch (mode) {
 900     case UnscaledNarrowOop:
 901       return "32-bit";
 902     case ZeroBasedNarrowOop:
 903       return "Zero based";
 904     case DisjointBaseNarrowOop:
 905       return "Non-zero disjoint base";
 906     case HeapBasedNarrowOop:
 907       return "Non-zero based";
 908     default:
 909       ShouldNotReachHere();
 910       return "";
 911   }
 912 }
 913 
 914 
 915 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
 916   if (narrow_oop_base_disjoint()) {
 917     return DisjointBaseNarrowOop;
 918   }
 919 
 920   if (narrow_oop_base() != 0) {
 921     return HeapBasedNarrowOop;
 922   }
 923 
 924   if (narrow_oop_shift() != 0) {
 925     return ZeroBasedNarrowOop;
 926   }
 927 
 928   return UnscaledNarrowOop;
 929 }
 930 
 931 void initialize_known_method(LatestMethodCache* method_cache,
 932                              InstanceKlass* ik,
 933                              const char* method,
 934                              Symbol* signature,
 935                              bool is_static, TRAPS)
 936 {
 937   TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
 938   Method* m = NULL;
 939   // The klass must be linked before looking up the method.
 940   if (!ik->link_class_or_fail(THREAD) ||
 941       ((m = ik->find_method(name, signature)) == NULL) ||
 942       is_static != m->is_static()) {
 943     ResourceMark rm(THREAD);
 944     // NoSuchMethodException doesn't actually work because it tries to run the
 945     // <init> function before java_lang_Class is linked. Print error and exit.
 946     vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
 947                                  ik->name()->as_C_string(), method));
 948   }
 949   method_cache->init(ik, m);
 950 }
 951 
 952 void Universe::initialize_known_methods(TRAPS) {
 953   // Set up static method for registering finalizers
 954   initialize_known_method(_finalizer_register_cache,
 955                           SystemDictionary::Finalizer_klass(),
 956                           "register",
 957                           vmSymbols::object_void_signature(), true, CHECK);
 958 
 959   initialize_known_method(_throw_illegal_access_error_cache,
 960                           SystemDictionary::internal_Unsafe_klass(),
 961                           "throwIllegalAccessError",
 962                           vmSymbols::void_method_signature(), true, CHECK);
 963 
 964   // Set up method for registering loaded classes in class loader vector
 965   initialize_known_method(_loader_addClass_cache,
 966                           SystemDictionary::ClassLoader_klass(),
 967                           "addClass",
 968                           vmSymbols::class_void_signature(), false, CHECK);
 969 
 970   // Set up method for checking protection domain
 971   initialize_known_method(_pd_implies_cache,
 972                           SystemDictionary::ProtectionDomain_klass(),
 973                           "impliesCreateAccessControlContext",
 974                           vmSymbols::void_boolean_signature(), false, CHECK);
 975 
 976   // Set up method for stack walking
 977   initialize_known_method(_do_stack_walk_cache,
 978                           SystemDictionary::AbstractStackWalker_klass(),
 979                           "doStackWalk",
 980                           vmSymbols::doStackWalk_signature(), false, CHECK);
 981 }
 982 
 983 void universe2_init() {
 984   EXCEPTION_MARK;
 985   Universe::genesis(CATCH);
 986 }
 987 
 988 // Set after initialization of the module runtime, call_initModuleRuntime
 989 void universe_post_module_init() {
 990   Universe::_module_initialized = true;
 991 }
 992 
 993 bool universe_post_init() {
 994   assert(!is_init_completed(), "Error: initialization not yet completed!");
 995   Universe::_fully_initialized = true;
 996   EXCEPTION_MARK;
 997   { ResourceMark rm;
 998     Interpreter::initialize();      // needed for interpreter entry points
 999     if (!UseSharedSpaces) {
1000       HandleMark hm(THREAD);
1001       Klass* ok = SystemDictionary::Object_klass();
1002       Universe::reinitialize_vtable_of(ok, CHECK_false);
1003       Universe::reinitialize_itables(CHECK_false);
1004     }
1005   }
1006 
1007   HandleMark hm(THREAD);
1008   // Setup preallocated empty java.lang.Class array
1009   Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
1010 
1011   // Setup preallocated OutOfMemoryError errors
1012   Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
1013   InstanceKlass* ik = InstanceKlass::cast(k);
1014   Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
1015   Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
1016   Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
1017   Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
1018   Universe::_out_of_memory_error_gc_overhead_limit =
1019     ik->allocate_instance(CHECK_false);
1020   Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
1021 
1022   // Setup preallocated cause message for delayed StackOverflowError
1023   if (StackReservedPages > 0) {
1024     Universe::_delayed_stack_overflow_error_message =
1025       java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1026   }
1027 
1028   // Setup preallocated NullPointerException
1029   // (this is currently used for a cheap & dirty solution in compiler exception handling)
1030   k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1031   Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1032   // Setup preallocated ArithmeticException
1033   // (this is currently used for a cheap & dirty solution in compiler exception handling)
1034   k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1035   Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1036   // Virtual Machine Error for when we get into a situation we can't resolve
1037   k = SystemDictionary::resolve_or_fail(
1038     vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1039   bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1040   if (!linked) {
1041      tty->print_cr("Unable to link/verify VirtualMachineError class");
1042      return false; // initialization failed
1043   }
1044   Universe::_virtual_machine_error_instance =
1045     InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1046 
1047   Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1048 
1049   Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1050   java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1051 
1052   msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1053   java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1054   msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1055   java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1056 
1057   msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1058   java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1059 
1060   msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1061   java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1062 
1063   msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1064   java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1065 
1066   msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1067   java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1068 
1069   // Setup the array of errors that have preallocated backtrace
1070   k = Universe::_out_of_memory_error_java_heap->klass();
1071   assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1072   ik = InstanceKlass::cast(k);
1073 
1074   int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1075   Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1076   for (int i=0; i<len; i++) {
1077     oop err = ik->allocate_instance(CHECK_false);
1078     Handle err_h = Handle(THREAD, err);
1079     java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1080     Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1081   }
1082   Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1083 
1084   Universe::initialize_known_methods(CHECK_false);
1085 
1086   // This needs to be done before the first scavenge/gc, since
1087   // it's an input to soft ref clearing policy.
1088   {
1089     MutexLocker x(Heap_lock);
1090     Universe::update_heap_info_at_gc();
1091   }
1092 
1093   // ("weak") refs processing infrastructure initialization
1094   Universe::heap()->post_initialize();
1095 
1096   MemoryService::add_metaspace_memory_pools();
1097 
1098   MemoryService::set_universe_heap(Universe::heap());
1099 #if INCLUDE_CDS
1100   SharedClassUtil::initialize(CHECK_false);
1101 #endif
1102   return true;
1103 }
1104 
1105 
1106 void Universe::compute_base_vtable_size() {
1107   _base_vtable_size = ClassLoader::compute_Object_vtable();
1108 }
1109 
1110 void Universe::print_on(outputStream* st) {
1111   GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1112   st->print_cr("Heap");
1113   heap()->print_on(st);
1114 }
1115 
1116 void Universe::print_heap_at_SIGBREAK() {
1117   if (PrintHeapAtSIGBREAK) {
1118     print_on(tty);
1119     tty->cr();
1120     tty->flush();
1121   }
1122 }
1123 
1124 void Universe::print_heap_before_gc() {
1125   LogTarget(Debug, gc, heap) lt;
1126   if (lt.is_enabled()) {
1127     LogStream ls(lt);
1128     ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1129     ResourceMark rm;
1130     heap()->print_on(&ls);
1131   }
1132 }
1133 
1134 void Universe::print_heap_after_gc() {
1135   LogTarget(Debug, gc, heap) lt;
1136   if (lt.is_enabled()) {
1137     LogStream ls(lt);
1138     ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1139     ResourceMark rm;
1140     heap()->print_on(&ls);
1141   }
1142 }
1143 
1144 void Universe::initialize_verify_flags() {
1145   verify_flags = 0;
1146   const char delimiter[] = " ,";
1147 
1148   size_t length = strlen(VerifySubSet);
1149   char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1150   strncpy(subset_list, VerifySubSet, length + 1);
1151 
1152   char* token = strtok(subset_list, delimiter);
1153   while (token != NULL) {
1154     if (strcmp(token, "threads") == 0) {
1155       verify_flags |= Verify_Threads;
1156     } else if (strcmp(token, "heap") == 0) {
1157       verify_flags |= Verify_Heap;
1158     } else if (strcmp(token, "symbol_table") == 0) {
1159       verify_flags |= Verify_SymbolTable;
1160     } else if (strcmp(token, "string_table") == 0) {
1161       verify_flags |= Verify_StringTable;
1162     } else if (strcmp(token, "codecache") == 0) {
1163       verify_flags |= Verify_CodeCache;
1164     } else if (strcmp(token, "dictionary") == 0) {
1165       verify_flags |= Verify_SystemDictionary;
1166     } else if (strcmp(token, "classloader_data_graph") == 0) {
1167       verify_flags |= Verify_ClassLoaderDataGraph;
1168     } else if (strcmp(token, "metaspace") == 0) {
1169       verify_flags |= Verify_MetaspaceAux;
1170     } else if (strcmp(token, "jni_handles") == 0) {
1171       verify_flags |= Verify_JNIHandles;
1172     } else if (strcmp(token, "codecache_oops") == 0) {
1173       verify_flags |= Verify_CodeCacheOops;
1174     } else {
1175       vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1176     }
1177     token = strtok(NULL, delimiter);
1178   }
1179   FREE_C_HEAP_ARRAY(char, subset_list);
1180 }
1181 
1182 bool Universe::should_verify_subset(uint subset) {
1183   if (verify_flags & subset) {
1184     return true;
1185   }
1186   return false;
1187 }
1188 
1189 void Universe::verify(VerifyOption option, const char* prefix) {
1190   // The use of _verify_in_progress is a temporary work around for
1191   // 6320749.  Don't bother with a creating a class to set and clear
1192   // it since it is only used in this method and the control flow is
1193   // straight forward.
1194   _verify_in_progress = true;
1195 
1196   COMPILER2_PRESENT(
1197     assert(!DerivedPointerTable::is_active(),
1198          "DPT should not be active during verification "
1199          "(of thread stacks below)");
1200   )
1201 
1202   ResourceMark rm;
1203   HandleMark hm;  // Handles created during verification can be zapped
1204   _verify_count++;
1205 
1206   FormatBuffer<> title("Verifying %s", prefix);
1207   GCTraceTime(Info, gc, verify) tm(title.buffer());
1208   if (should_verify_subset(Verify_Threads)) {
1209     log_debug(gc, verify)("Threads");
1210     Threads::verify();
1211   }
1212   if (should_verify_subset(Verify_Heap)) {
1213     log_debug(gc, verify)("Heap");
1214     heap()->verify(option);
1215   }
1216   if (should_verify_subset(Verify_SymbolTable)) {
1217     log_debug(gc, verify)("SymbolTable");
1218     SymbolTable::verify();
1219   }
1220   if (should_verify_subset(Verify_StringTable)) {
1221     log_debug(gc, verify)("StringTable");
1222     StringTable::verify();
1223   }
1224   if (should_verify_subset(Verify_CodeCache)) {
1225   {
1226     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1227     log_debug(gc, verify)("CodeCache");
1228     CodeCache::verify();
1229   }
1230   }
1231   if (should_verify_subset(Verify_SystemDictionary)) {
1232     log_debug(gc, verify)("SystemDictionary");
1233     SystemDictionary::verify();
1234   }
1235 #ifndef PRODUCT
1236   if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1237     log_debug(gc, verify)("ClassLoaderDataGraph");
1238     ClassLoaderDataGraph::verify();
1239   }
1240 #endif
1241   if (should_verify_subset(Verify_MetaspaceAux)) {
1242     log_debug(gc, verify)("MetaspaceAux");
1243     MetaspaceAux::verify_free_chunks();
1244   }
1245   if (should_verify_subset(Verify_JNIHandles)) {
1246     log_debug(gc, verify)("JNIHandles");
1247     JNIHandles::verify();
1248   }
1249   if (should_verify_subset(Verify_CodeCacheOops)) {
1250     log_debug(gc, verify)("CodeCache Oops");
1251     CodeCache::verify_oops();
1252   }
1253 
1254   _verify_in_progress = false;
1255 }
1256 
1257 
1258 #ifndef PRODUCT
1259 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1260   assert(low_boundary < high_boundary, "bad interval");
1261 
1262   // decide which low-order bits we require to be clear:
1263   size_t alignSize = MinObjAlignmentInBytes;
1264   size_t min_object_size = CollectedHeap::min_fill_size();
1265 
1266   // make an inclusive limit:
1267   uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1268   uintptr_t min = (uintptr_t)low_boundary;
1269   assert(min < max, "bad interval");
1270   uintptr_t diff = max ^ min;
1271 
1272   // throw away enough low-order bits to make the diff vanish
1273   uintptr_t mask = (uintptr_t)(-1);
1274   while ((mask & diff) != 0)
1275     mask <<= 1;
1276   uintptr_t bits = (min & mask);
1277   assert(bits == (max & mask), "correct mask");
1278   // check an intermediate value between min and max, just to make sure:
1279   assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1280 
1281   // require address alignment, too:
1282   mask |= (alignSize - 1);
1283 
1284   if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1285     assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1286   }
1287   _verify_oop_mask = mask;
1288   _verify_oop_bits = bits;
1289 }
1290 
1291 // Oop verification (see MacroAssembler::verify_oop)
1292 
1293 uintptr_t Universe::verify_oop_mask() {
1294   MemRegion m = heap()->reserved_region();
1295   calculate_verify_data(m.start(), m.end());
1296   return _verify_oop_mask;
1297 }
1298 
1299 uintptr_t Universe::verify_oop_bits() {
1300   MemRegion m = heap()->reserved_region();
1301   calculate_verify_data(m.start(), m.end());
1302   return _verify_oop_bits;
1303 }
1304 
1305 uintptr_t Universe::verify_mark_mask() {
1306   return markOopDesc::lock_mask_in_place;
1307 }
1308 
1309 uintptr_t Universe::verify_mark_bits() {
1310   intptr_t mask = verify_mark_mask();
1311   intptr_t bits = (intptr_t)markOopDesc::prototype();
1312   assert((bits & ~mask) == 0, "no stray header bits");
1313   return bits;
1314 }
1315 #endif // PRODUCT
1316 
1317 
1318 void Universe::compute_verify_oop_data() {
1319   verify_oop_mask();
1320   verify_oop_bits();
1321   verify_mark_mask();
1322   verify_mark_bits();
1323 }
1324 
1325 
1326 void LatestMethodCache::init(Klass* k, Method* m) {
1327   if (!UseSharedSpaces) {
1328     _klass = k;
1329   }
1330 #ifndef PRODUCT
1331   else {
1332     // sharing initilization should have already set up _klass
1333     assert(_klass != NULL, "just checking");
1334   }
1335 #endif
1336 
1337   _method_idnum = m->method_idnum();
1338   assert(_method_idnum >= 0, "sanity check");
1339 }
1340 
1341 
1342 Method* LatestMethodCache::get_method() {
1343   if (klass() == NULL) return NULL;
1344   InstanceKlass* ik = InstanceKlass::cast(klass());
1345   Method* m = ik->method_with_idnum(method_idnum());
1346   assert(m != NULL, "sanity check");
1347   return m;
1348 }
1349 
1350 
1351 #ifdef ASSERT
1352 // Release dummy object(s) at bottom of heap
1353 bool Universe::release_fullgc_alot_dummy() {
1354   MutexLocker ml(FullGCALot_lock);
1355   if (_fullgc_alot_dummy_array != NULL) {
1356     if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1357       // No more dummies to release, release entire array instead
1358       _fullgc_alot_dummy_array = NULL;
1359       return false;
1360     }
1361     if (!UseConcMarkSweepGC) {
1362       // Release dummy at bottom of old generation
1363       _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1364     }
1365     // Release dummy at bottom of permanent generation
1366     _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1367   }
1368   return true;
1369 }
1370 
1371 #endif // ASSERT
--- EOF ---