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 #if INCLUDE_VBC
 169 int Universe::_oop_metadata_odd_mask = 0;
 170 #endif
 171 
 172 void Universe::basic_type_classes_do(void f(Klass*)) {
 173   f(boolArrayKlassObj());
 174   f(byteArrayKlassObj());
 175   f(charArrayKlassObj());
 176   f(intArrayKlassObj());
 177   f(shortArrayKlassObj());
 178   f(longArrayKlassObj());
 179   f(singleArrayKlassObj());
 180   f(doubleArrayKlassObj());
 181 }
 182 
 183 void Universe::oops_do(OopClosure* f, bool do_all) {
 184 
 185   f->do_oop((oop*) &_int_mirror);
 186   f->do_oop((oop*) &_float_mirror);
 187   f->do_oop((oop*) &_double_mirror);
 188   f->do_oop((oop*) &_byte_mirror);
 189   f->do_oop((oop*) &_bool_mirror);
 190   f->do_oop((oop*) &_char_mirror);
 191   f->do_oop((oop*) &_long_mirror);
 192   f->do_oop((oop*) &_short_mirror);
 193   f->do_oop((oop*) &_void_mirror);
 194 
 195   for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
 196     f->do_oop((oop*) &_mirrors[i]);
 197   }
 198   assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
 199 
 200   f->do_oop((oop*)&_the_empty_class_klass_array);
 201   f->do_oop((oop*)&_the_null_string);
 202   f->do_oop((oop*)&_the_min_jint_string);
 203   f->do_oop((oop*)&_out_of_memory_error_java_heap);
 204   f->do_oop((oop*)&_out_of_memory_error_metaspace);
 205   f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
 206   f->do_oop((oop*)&_out_of_memory_error_array_size);
 207   f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
 208   f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
 209   f->do_oop((oop*)&_delayed_stack_overflow_error_message);
 210   f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
 211   f->do_oop((oop*)&_null_ptr_exception_instance);
 212   f->do_oop((oop*)&_arithmetic_exception_instance);
 213   f->do_oop((oop*)&_virtual_machine_error_instance);
 214   f->do_oop((oop*)&_main_thread_group);
 215   f->do_oop((oop*)&_system_thread_group);
 216   f->do_oop((oop*)&_vm_exception);
 217   f->do_oop((oop*)&_allocation_context_notification_obj);
 218   f->do_oop((oop*)&_reference_pending_list);
 219   debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
 220 }
 221 
 222 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
 223   it->push(&_klass);
 224 }
 225 
 226 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
 227   it->push(&_boolArrayKlassObj);
 228   it->push(&_byteArrayKlassObj);
 229   it->push(&_charArrayKlassObj);
 230   it->push(&_intArrayKlassObj);
 231   it->push(&_shortArrayKlassObj);
 232   it->push(&_longArrayKlassObj);
 233   it->push(&_singleArrayKlassObj);
 234   it->push(&_doubleArrayKlassObj);
 235   for (int i = 0; i < T_VOID+1; i++) {
 236     it->push(&_typeArrayKlassObjs[i]);
 237   }
 238   it->push(&_objectArrayKlassObj);
 239 
 240   it->push(&_the_empty_int_array);
 241   it->push(&_the_empty_short_array);
 242   it->push(&_the_empty_klass_array);
 243   it->push(&_the_empty_method_array);
 244   it->push(&_the_array_interfaces_array);
 245 
 246   _finalizer_register_cache->metaspace_pointers_do(it);
 247   _loader_addClass_cache->metaspace_pointers_do(it);
 248   _pd_implies_cache->metaspace_pointers_do(it);
 249   _throw_illegal_access_error_cache->metaspace_pointers_do(it);
 250   _do_stack_walk_cache->metaspace_pointers_do(it);
 251 }
 252 
 253 // Serialize metadata in and out of CDS archive, not oops.
 254 void Universe::serialize(SerializeClosure* f, bool do_all) {
 255 
 256   f->do_ptr((void**)&_boolArrayKlassObj);
 257   f->do_ptr((void**)&_byteArrayKlassObj);
 258   f->do_ptr((void**)&_charArrayKlassObj);
 259   f->do_ptr((void**)&_intArrayKlassObj);
 260   f->do_ptr((void**)&_shortArrayKlassObj);
 261   f->do_ptr((void**)&_longArrayKlassObj);
 262   f->do_ptr((void**)&_singleArrayKlassObj);
 263   f->do_ptr((void**)&_doubleArrayKlassObj);
 264   f->do_ptr((void**)&_objectArrayKlassObj);
 265 
 266   {
 267     for (int i = 0; i < T_VOID+1; i++) {
 268       if (_typeArrayKlassObjs[i] != NULL) {
 269         assert(i >= T_BOOLEAN, "checking");
 270         f->do_ptr((void**)&_typeArrayKlassObjs[i]);
 271       } else if (do_all) {
 272         f->do_ptr((void**)&_typeArrayKlassObjs[i]);
 273       }
 274     }
 275   }
 276 
 277   f->do_ptr((void**)&_the_array_interfaces_array);
 278   f->do_ptr((void**)&_the_empty_int_array);
 279   f->do_ptr((void**)&_the_empty_short_array);
 280   f->do_ptr((void**)&_the_empty_method_array);
 281   f->do_ptr((void**)&_the_empty_klass_array);
 282   _finalizer_register_cache->serialize(f);
 283   _loader_addClass_cache->serialize(f);
 284   _pd_implies_cache->serialize(f);
 285   _throw_illegal_access_error_cache->serialize(f);
 286   _do_stack_walk_cache->serialize(f);
 287 }
 288 
 289 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
 290   if (size < alignment || size % alignment != 0) {
 291     vm_exit_during_initialization(
 292       err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
 293   }
 294 }
 295 
 296 void initialize_basic_type_klass(Klass* k, TRAPS) {
 297   Klass* ok = SystemDictionary::Object_klass();
 298 #if INCLUDE_CDS
 299   if (UseSharedSpaces) {
 300     ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
 301     assert(k->super() == ok, "u3");
 302     k->restore_unshareable_info(loader_data, Handle(), CHECK);
 303   } else
 304 #endif
 305   {
 306     k->initialize_supers(ok, CHECK);
 307   }
 308   k->append_to_sibling_list();
 309 }
 310 
 311 void Universe::genesis(TRAPS) {
 312   ResourceMark rm;
 313 
 314   { FlagSetting fs(_bootstrapping, true);
 315 
 316     { MutexLocker mc(Compile_lock);
 317 
 318       java_lang_Class::allocate_fixup_lists();
 319 
 320       // determine base vtable size; without that we cannot create the array klasses
 321       compute_base_vtable_size();
 322 
 323       if (!UseSharedSpaces) {
 324         _boolArrayKlassObj      = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
 325         _charArrayKlassObj      = TypeArrayKlass::create_klass(T_CHAR,    sizeof(jchar),    CHECK);
 326         _singleArrayKlassObj    = TypeArrayKlass::create_klass(T_FLOAT,   sizeof(jfloat),   CHECK);
 327         _doubleArrayKlassObj    = TypeArrayKlass::create_klass(T_DOUBLE,  sizeof(jdouble),  CHECK);
 328         _byteArrayKlassObj      = TypeArrayKlass::create_klass(T_BYTE,    sizeof(jbyte),    CHECK);
 329         _shortArrayKlassObj     = TypeArrayKlass::create_klass(T_SHORT,   sizeof(jshort),   CHECK);
 330         _intArrayKlassObj       = TypeArrayKlass::create_klass(T_INT,     sizeof(jint),     CHECK);
 331         _longArrayKlassObj      = TypeArrayKlass::create_klass(T_LONG,    sizeof(jlong),    CHECK);
 332 
 333         _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
 334         _typeArrayKlassObjs[T_CHAR]    = _charArrayKlassObj;
 335         _typeArrayKlassObjs[T_FLOAT]   = _singleArrayKlassObj;
 336         _typeArrayKlassObjs[T_DOUBLE]  = _doubleArrayKlassObj;
 337         _typeArrayKlassObjs[T_BYTE]    = _byteArrayKlassObj;
 338         _typeArrayKlassObjs[T_SHORT]   = _shortArrayKlassObj;
 339         _typeArrayKlassObjs[T_INT]     = _intArrayKlassObj;
 340         _typeArrayKlassObjs[T_LONG]    = _longArrayKlassObj;
 341 
 342         ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
 343 
 344         _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
 345         _the_empty_int_array        = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
 346         _the_empty_short_array      = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
 347         _the_empty_method_array     = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
 348         _the_empty_klass_array      = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
 349       }
 350     }
 351 
 352     vmSymbols::initialize(CHECK);
 353 
 354     SystemDictionary::initialize(CHECK);
 355 
 356     Klass* ok = SystemDictionary::Object_klass();
 357 
 358     _the_null_string            = StringTable::intern("null", CHECK);
 359     _the_min_jint_string       = StringTable::intern("-2147483648", CHECK);
 360 
 361 #if INCLUDE_CDS
 362     if (UseSharedSpaces) {
 363       // Verify shared interfaces array.
 364       assert(_the_array_interfaces_array->at(0) ==
 365              SystemDictionary::Cloneable_klass(), "u3");
 366       assert(_the_array_interfaces_array->at(1) ==
 367              SystemDictionary::Serializable_klass(), "u3");
 368       MetaspaceShared::fixup_mapped_heap_regions();
 369     } else
 370 #endif
 371     {
 372       // Set up shared interfaces array.  (Do this before supers are set up.)
 373       _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
 374       _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
 375     }
 376 
 377     initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
 378     initialize_basic_type_klass(charArrayKlassObj(), CHECK);
 379     initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
 380     initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
 381     initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
 382     initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
 383     initialize_basic_type_klass(intArrayKlassObj(), CHECK);
 384     initialize_basic_type_klass(longArrayKlassObj(), CHECK);
 385   } // end of core bootstrapping
 386 
 387   // Maybe this could be lifted up now that object array can be initialized
 388   // during the bootstrapping.
 389 
 390   // OLD
 391   // Initialize _objectArrayKlass after core bootstraping to make
 392   // sure the super class is set up properly for _objectArrayKlass.
 393   // ---
 394   // NEW
 395   // Since some of the old system object arrays have been converted to
 396   // ordinary object arrays, _objectArrayKlass will be loaded when
 397   // SystemDictionary::initialize(CHECK); is run. See the extra check
 398   // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
 399   _objectArrayKlassObj = InstanceKlass::
 400     cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
 401   // OLD
 402   // Add the class to the class hierarchy manually to make sure that
 403   // its vtable is initialized after core bootstrapping is completed.
 404   // ---
 405   // New
 406   // Have already been initialized.
 407   _objectArrayKlassObj->append_to_sibling_list();
 408 
 409   #ifdef ASSERT
 410   if (FullGCALot) {
 411     // Allocate an array of dummy objects.
 412     // We'd like these to be at the bottom of the old generation,
 413     // so that when we free one and then collect,
 414     // (almost) the whole heap moves
 415     // and we find out if we actually update all the oops correctly.
 416     // But we can't allocate directly in the old generation,
 417     // so we allocate wherever, and hope that the first collection
 418     // moves these objects to the bottom of the old generation.
 419     // We can allocate directly in the permanent generation, so we do.
 420     int size;
 421     if (UseConcMarkSweepGC) {
 422       log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
 423       size = FullGCALotDummies;
 424     } else {
 425       size = FullGCALotDummies * 2;
 426     }
 427     objArrayOop    naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
 428     objArrayHandle dummy_array(THREAD, naked_array);
 429     int i = 0;
 430     while (i < size) {
 431         // Allocate dummy in old generation
 432       oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
 433       dummy_array->obj_at_put(i++, dummy);
 434     }
 435     {
 436       // Only modify the global variable inside the mutex.
 437       // If we had a race to here, the other dummy_array instances
 438       // and their elements just get dropped on the floor, which is fine.
 439       MutexLocker ml(FullGCALot_lock);
 440       if (_fullgc_alot_dummy_array == NULL) {
 441         _fullgc_alot_dummy_array = dummy_array();
 442       }
 443     }
 444     assert(i == _fullgc_alot_dummy_array->length(), "just checking");
 445   }
 446   #endif
 447 
 448   // Initialize dependency array for null class loader
 449   ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
 450 
 451 }
 452 
 453 void Universe::initialize_basic_type_mirrors(TRAPS) {
 454     assert(_int_mirror==NULL, "basic type mirrors already initialized");
 455     _int_mirror     =
 456       java_lang_Class::create_basic_type_mirror("int",    T_INT, CHECK);
 457     _float_mirror   =
 458       java_lang_Class::create_basic_type_mirror("float",  T_FLOAT,   CHECK);
 459     _double_mirror  =
 460       java_lang_Class::create_basic_type_mirror("double", T_DOUBLE,  CHECK);
 461     _byte_mirror    =
 462       java_lang_Class::create_basic_type_mirror("byte",   T_BYTE, CHECK);
 463     _bool_mirror    =
 464       java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
 465     _char_mirror    =
 466       java_lang_Class::create_basic_type_mirror("char",   T_CHAR, CHECK);
 467     _long_mirror    =
 468       java_lang_Class::create_basic_type_mirror("long",   T_LONG, CHECK);
 469     _short_mirror   =
 470       java_lang_Class::create_basic_type_mirror("short",  T_SHORT,   CHECK);
 471     _void_mirror    =
 472       java_lang_Class::create_basic_type_mirror("void",   T_VOID, CHECK);
 473 
 474     _mirrors[T_INT]     = _int_mirror;
 475     _mirrors[T_FLOAT]   = _float_mirror;
 476     _mirrors[T_DOUBLE]  = _double_mirror;
 477     _mirrors[T_BYTE]    = _byte_mirror;
 478     _mirrors[T_BOOLEAN] = _bool_mirror;
 479     _mirrors[T_CHAR]    = _char_mirror;
 480     _mirrors[T_LONG]    = _long_mirror;
 481     _mirrors[T_SHORT]   = _short_mirror;
 482     _mirrors[T_VOID]    = _void_mirror;
 483   //_mirrors[T_OBJECT]  = _object_klass->java_mirror();
 484   //_mirrors[T_ARRAY]   = _object_klass->java_mirror();
 485 }
 486 
 487 void Universe::fixup_mirrors(TRAPS) {
 488   // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
 489   // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
 490   // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
 491   // that the number of objects allocated at this point is very small.
 492   assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
 493   HandleMark hm(THREAD);
 494   // Cache the start of the static fields
 495   InstanceMirrorKlass::init_offset_of_static_fields();
 496 
 497   GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
 498   int list_length = list->length();
 499   for (int i = 0; i < list_length; i++) {
 500     Klass* k = list->at(i);
 501     assert(k->is_klass(), "List should only hold classes");
 502     EXCEPTION_MARK;
 503     java_lang_Class::fixup_mirror(k, CATCH);
 504   }
 505   delete java_lang_Class::fixup_mirror_list();
 506   java_lang_Class::set_fixup_mirror_list(NULL);
 507 }
 508 
 509 #define assert_pll_locked(test) \
 510   assert(Heap_lock->test(), "Reference pending list access requires lock")
 511 
 512 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
 513 
 514 oop Universe::reference_pending_list() {
 515   if (Thread::current()->is_VM_thread()) {
 516     assert_pll_locked(is_locked);
 517   } else {
 518     assert_pll_ownership();
 519   }
 520   return _reference_pending_list;
 521 }
 522 
 523 void Universe::set_reference_pending_list(oop list) {
 524   assert_pll_ownership();
 525   _reference_pending_list = list;
 526 }
 527 
 528 bool Universe::has_reference_pending_list() {
 529   assert_pll_ownership();
 530   return _reference_pending_list != NULL;
 531 }
 532 
 533 oop Universe::swap_reference_pending_list(oop list) {
 534   assert_pll_locked(is_locked);
 535   return Atomic::xchg(list, &_reference_pending_list);
 536 }
 537 
 538 #undef assert_pll_locked
 539 #undef assert_pll_ownership
 540 
 541 
 542 static bool has_run_finalizers_on_exit = false;
 543 
 544 void Universe::run_finalizers_on_exit() {
 545   if (has_run_finalizers_on_exit) return;
 546   has_run_finalizers_on_exit = true;
 547 
 548   // Called on VM exit. This ought to be run in a separate thread.
 549   log_trace(ref)("Callback to run finalizers on exit");
 550   {
 551     PRESERVE_EXCEPTION_MARK;
 552     Klass* finalizer_klass = SystemDictionary::Finalizer_klass();
 553     JavaValue result(T_VOID);
 554     JavaCalls::call_static(
 555       &result,
 556       finalizer_klass,
 557       vmSymbols::run_finalizers_on_exit_name(),
 558       vmSymbols::void_method_signature(),
 559       THREAD
 560     );
 561     // Ignore any pending exceptions
 562     CLEAR_PENDING_EXCEPTION;
 563   }
 564 }
 565 
 566 
 567 // initialize_vtable could cause gc if
 568 // 1) we specified true to initialize_vtable and
 569 // 2) this ran after gc was enabled
 570 // In case those ever change we use handles for oops
 571 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
 572   // init vtable of k and all subclasses
 573   ko->vtable().initialize_vtable(false, CHECK);
 574   if (ko->is_instance_klass()) {
 575     for (Klass* sk = ko->subklass();
 576          sk != NULL;
 577          sk = sk->next_sibling()) {
 578       reinitialize_vtable_of(sk, CHECK);
 579     }
 580   }
 581 }
 582 
 583 
 584 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
 585   k->itable().initialize_itable(false, CHECK);
 586 }
 587 
 588 
 589 void Universe::reinitialize_itables(TRAPS) {
 590   ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
 591 }
 592 
 593 
 594 bool Universe::on_page_boundary(void* addr) {
 595   return is_aligned(addr, os::vm_page_size());
 596 }
 597 
 598 
 599 bool Universe::should_fill_in_stack_trace(Handle throwable) {
 600   // never attempt to fill in the stack trace of preallocated errors that do not have
 601   // backtrace. These errors are kept alive forever and may be "re-used" when all
 602   // preallocated errors with backtrace have been consumed. Also need to avoid
 603   // a potential loop which could happen if an out of memory occurs when attempting
 604   // to allocate the backtrace.
 605   return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
 606           (throwable() != Universe::_out_of_memory_error_metaspace)  &&
 607           (throwable() != Universe::_out_of_memory_error_class_metaspace)  &&
 608           (throwable() != Universe::_out_of_memory_error_array_size) &&
 609           (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
 610           (throwable() != Universe::_out_of_memory_error_realloc_objects));
 611 }
 612 
 613 
 614 oop Universe::gen_out_of_memory_error(oop default_err) {
 615   // generate an out of memory error:
 616   // - if there is a preallocated error and stack traces are available
 617   //   (j.l.Throwable is initialized), then return the preallocated
 618   //   error with a filled in stack trace, and with the message
 619   //   provided by the default error.
 620   // - otherwise, return the default error, without a stack trace.
 621   int next;
 622   if ((_preallocated_out_of_memory_error_avail_count > 0) &&
 623       SystemDictionary::Throwable_klass()->is_initialized()) {
 624     next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
 625     assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
 626   } else {
 627     next = -1;
 628   }
 629   if (next < 0) {
 630     // all preallocated errors have been used.
 631     // return default
 632     return default_err;
 633   } else {
 634     Thread* THREAD = Thread::current();
 635     Handle default_err_h(THREAD, default_err);
 636     // get the error object at the slot and set set it to NULL so that the
 637     // array isn't keeping it alive anymore.
 638     Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
 639     assert(exc() != NULL, "slot has been used already");
 640     preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
 641 
 642     // use the message from the default error
 643     oop msg = java_lang_Throwable::message(default_err_h());
 644     assert(msg != NULL, "no message");
 645     java_lang_Throwable::set_message(exc(), msg);
 646 
 647     // populate the stack trace and return it.
 648     java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
 649     return exc();
 650   }
 651 }
 652 
 653 intptr_t Universe::_non_oop_bits = 0;
 654 
 655 void* Universe::non_oop_word() {
 656   // Neither the high bits nor the low bits of this value is allowed
 657   // to look like (respectively) the high or low bits of a real oop.
 658   //
 659   // High and low are CPU-specific notions, but low always includes
 660   // the low-order bit.  Since oops are always aligned at least mod 4,
 661   // setting the low-order bit will ensure that the low half of the
 662   // word will never look like that of a real oop.
 663   //
 664   // Using the OS-supplied non-memory-address word (usually 0 or -1)
 665   // will take care of the high bits, however many there are.
 666 
 667   if (_non_oop_bits == 0) {
 668     _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
 669   }
 670 
 671   return (void*)_non_oop_bits;
 672 }
 673 
 674 jint universe_init() {
 675   assert(!Universe::_fully_initialized, "called after initialize_vtables");
 676   guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
 677          "LogHeapWordSize is incorrect.");
 678   guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
 679   guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
 680             "oop size is not not a multiple of HeapWord size");
 681 
 682   TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
 683 
 684   JavaClasses::compute_hard_coded_offsets();
 685 
 686   jint status = Universe::initialize_heap();
 687   if (status != JNI_OK) {
 688     return status;
 689   }
 690 
 691   Metaspace::global_initialize();
 692 
 693   // Initialize performance counters for metaspaces
 694   MetaspaceCounters::initialize_performance_counters();
 695   CompressedClassSpaceCounters::initialize_performance_counters();
 696 
 697   AOTLoader::universe_init();
 698 
 699   // Checks 'AfterMemoryInit' constraints.
 700   if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
 701     return JNI_EINVAL;
 702   }
 703 
 704   // Create memory for metadata.  Must be after initializing heap for
 705   // DumpSharedSpaces.
 706   ClassLoaderData::init_null_class_loader_data();
 707 
 708   // We have a heap so create the Method* caches before
 709   // Metaspace::initialize_shared_spaces() tries to populate them.
 710   Universe::_finalizer_register_cache = new LatestMethodCache();
 711   Universe::_loader_addClass_cache    = new LatestMethodCache();
 712   Universe::_pd_implies_cache         = new LatestMethodCache();
 713   Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
 714   Universe::_do_stack_walk_cache = new LatestMethodCache();
 715 
 716 #if INCLUDE_CDS
 717   if (UseSharedSpaces) {
 718     // Read the data structures supporting the shared spaces (shared
 719     // system dictionary, symbol table, etc.).  After that, access to
 720     // the file (other than the mapped regions) is no longer needed, and
 721     // the file is closed. Closing the file does not affect the
 722     // currently mapped regions.
 723     MetaspaceShared::initialize_shared_spaces();
 724     StringTable::create_table();
 725   } else
 726 #endif
 727   {
 728     SymbolTable::create_table();
 729     StringTable::create_table();
 730 
 731 #if INCLUDE_CDS
 732     if (DumpSharedSpaces) {
 733       MetaspaceShared::prepare_for_dumping();
 734     }
 735 #endif
 736   }
 737   if (strlen(VerifySubSet) > 0) {
 738     Universe::initialize_verify_flags();
 739   }
 740 
 741   ResolvedMethodTable::create_table();
 742 
 743   return JNI_OK;
 744 }
 745 
 746 CollectedHeap* Universe::create_heap() {
 747   assert(_collectedHeap == NULL, "Heap already created");
 748   assert(GCArguments::is_initialized(), "GC must be initialized here");
 749   return GCArguments::arguments()->create_heap();
 750 }
 751 
 752 // Choose the heap base address and oop encoding mode
 753 // when compressed oops are used:
 754 // Unscaled  - Use 32-bits oops without encoding when
 755 //     NarrowOopHeapBaseMin + heap_size < 4Gb
 756 // ZeroBased - Use zero based compressed oops with encoding when
 757 //     NarrowOopHeapBaseMin + heap_size < 32Gb
 758 // HeapBased - Use compressed oops with heap base + encoding.
 759 
 760 jint Universe::initialize_heap() {
 761   jint status = JNI_ERR;
 762 
 763   _collectedHeap = create_heap_ext();
 764   if (_collectedHeap == NULL) {
 765     _collectedHeap = create_heap();
 766   }
 767 
 768   status = _collectedHeap->initialize();
 769   if (status != JNI_OK) {
 770     return status;
 771   }
 772   log_info(gc)("Using %s", _collectedHeap->name());
 773 
 774   GCArguments::arguments()->post_heap_initialize();
 775   ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
 776 
 777 #ifdef _LP64
 778   if (UseCompressedOops) {
 779     // Subtract a page because something can get allocated at heap base.
 780     // This also makes implicit null checking work, because the
 781     // memory+1 page below heap_base needs to cause a signal.
 782     // See needs_explicit_null_check.
 783     // Only set the heap base for compressed oops because it indicates
 784     // compressed oops for pstack code.
 785     if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
 786       // Didn't reserve heap below 4Gb.  Must shift.
 787       Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
 788     }
 789     if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
 790       // Did reserve heap below 32Gb. Can use base == 0;
 791       Universe::set_narrow_oop_base(0);
 792     }
 793 
 794     Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
 795 
 796     LogTarget(Info, gc, heap, coops) lt;
 797     if (lt.is_enabled()) {
 798       ResourceMark rm;
 799       LogStream ls(lt);
 800       Universe::print_compressed_oops_mode(&ls);
 801     }
 802 
 803     // Tell tests in which mode we run.
 804     Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
 805                                                    narrow_oop_mode_to_string(narrow_oop_mode()),
 806                                                    false));
 807   }
 808   // Universe::narrow_oop_base() is one page below the heap.
 809   assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
 810          os::vm_page_size()) ||
 811          Universe::narrow_oop_base() == NULL, "invalid value");
 812   assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
 813          Universe::narrow_oop_shift() == 0, "invalid value");
 814 #endif
 815 
 816   // We will never reach the CATCH below since Exceptions::_throw will cause
 817   // the VM to exit if an exception is thrown during initialization
 818 
 819   if (UseTLAB) {
 820     assert(Universe::heap()->supports_tlab_allocation(),
 821            "Should support thread-local allocation buffers");
 822     ThreadLocalAllocBuffer::startup_initialization();
 823   }
 824   return JNI_OK;
 825 }
 826 
 827 void Universe::print_compressed_oops_mode(outputStream* st) {
 828   st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
 829             p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
 830 
 831   st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
 832 
 833   if (Universe::narrow_oop_base() != 0) {
 834     st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
 835   }
 836 
 837   if (Universe::narrow_oop_shift() != 0) {
 838     st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
 839   }
 840 
 841   if (!Universe::narrow_oop_use_implicit_null_checks()) {
 842     st->print(", no protected page in front of the heap");
 843   }
 844   st->cr();
 845 }
 846 
 847 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
 848 
 849   assert(alignment <= Arguments::conservative_max_heap_alignment(),
 850          "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
 851          alignment, Arguments::conservative_max_heap_alignment());
 852 
 853   size_t total_reserved = align_up(heap_size, alignment);
 854   assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
 855       "heap size is too big for compressed oops");
 856 
 857   bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
 858   assert(!UseLargePages
 859       || UseParallelGC
 860       || use_large_pages, "Wrong alignment to use large pages");
 861 
 862   // Now create the space.
 863   ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
 864 
 865   if (total_rs.is_reserved()) {
 866     assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
 867            "must be exactly of required size and alignment");
 868     // We are good.
 869 
 870     if (UseCompressedOops) {
 871       // Universe::initialize_heap() will reset this to NULL if unscaled
 872       // or zero-based narrow oops are actually used.
 873       // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
 874       Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
 875     }
 876 
 877     if (AllocateHeapAt != NULL) {
 878       log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
 879     }
 880     return total_rs;
 881   }
 882 
 883   vm_exit_during_initialization(
 884     err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
 885             total_reserved/K));
 886 
 887   // satisfy compiler
 888   ShouldNotReachHere();
 889   return ReservedHeapSpace(0, 0, false);
 890 }
 891 
 892 
 893 // It's the caller's responsibility to ensure glitch-freedom
 894 // (if required).
 895 void Universe::update_heap_info_at_gc() {
 896   _heap_capacity_at_last_gc = heap()->capacity();
 897   _heap_used_at_last_gc     = heap()->used();
 898 }
 899 
 900 
 901 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
 902   switch (mode) {
 903     case UnscaledNarrowOop:
 904       return "32-bit";
 905     case ZeroBasedNarrowOop:
 906       return "Zero based";
 907     case DisjointBaseNarrowOop:
 908       return "Non-zero disjoint base";
 909     case HeapBasedNarrowOop:
 910       return "Non-zero based";
 911     default:
 912       ShouldNotReachHere();
 913       return "";
 914   }
 915 }
 916 
 917 
 918 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
 919   if (narrow_oop_base_disjoint()) {
 920     return DisjointBaseNarrowOop;
 921   }
 922 
 923   if (narrow_oop_base() != 0) {
 924     return HeapBasedNarrowOop;
 925   }
 926 
 927   if (narrow_oop_shift() != 0) {
 928     return ZeroBasedNarrowOop;
 929   }
 930 
 931   return UnscaledNarrowOop;
 932 }
 933 
 934 void initialize_known_method(LatestMethodCache* method_cache,
 935                              InstanceKlass* ik,
 936                              const char* method,
 937                              Symbol* signature,
 938                              bool is_static, TRAPS)
 939 {
 940   TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
 941   Method* m = NULL;
 942   // The klass must be linked before looking up the method.
 943   if (!ik->link_class_or_fail(THREAD) ||
 944       ((m = ik->find_method(name, signature)) == NULL) ||
 945       is_static != m->is_static()) {
 946     ResourceMark rm(THREAD);
 947     // NoSuchMethodException doesn't actually work because it tries to run the
 948     // <init> function before java_lang_Class is linked. Print error and exit.
 949     vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
 950                                  ik->name()->as_C_string(), method));
 951   }
 952   method_cache->init(ik, m);
 953 }
 954 
 955 void Universe::initialize_known_methods(TRAPS) {
 956   // Set up static method for registering finalizers
 957   initialize_known_method(_finalizer_register_cache,
 958                           SystemDictionary::Finalizer_klass(),
 959                           "register",
 960                           vmSymbols::object_void_signature(), true, CHECK);
 961 
 962   initialize_known_method(_throw_illegal_access_error_cache,
 963                           SystemDictionary::internal_Unsafe_klass(),
 964                           "throwIllegalAccessError",
 965                           vmSymbols::void_method_signature(), true, CHECK);
 966 
 967   // Set up method for registering loaded classes in class loader vector
 968   initialize_known_method(_loader_addClass_cache,
 969                           SystemDictionary::ClassLoader_klass(),
 970                           "addClass",
 971                           vmSymbols::class_void_signature(), false, CHECK);
 972 
 973   // Set up method for checking protection domain
 974   initialize_known_method(_pd_implies_cache,
 975                           SystemDictionary::ProtectionDomain_klass(),
 976                           "impliesCreateAccessControlContext",
 977                           vmSymbols::void_boolean_signature(), false, CHECK);
 978 
 979   // Set up method for stack walking
 980   initialize_known_method(_do_stack_walk_cache,
 981                           SystemDictionary::AbstractStackWalker_klass(),
 982                           "doStackWalk",
 983                           vmSymbols::doStackWalk_signature(), false, CHECK);
 984 }
 985 
 986 void universe2_init() {
 987   EXCEPTION_MARK;
 988   Universe::genesis(CATCH);
 989 }
 990 
 991 // Set after initialization of the module runtime, call_initModuleRuntime
 992 void universe_post_module_init() {
 993   Universe::_module_initialized = true;
 994 }
 995 
 996 bool universe_post_init() {
 997   assert(!is_init_completed(), "Error: initialization not yet completed!");
 998   Universe::_fully_initialized = true;
 999   EXCEPTION_MARK;
1000   { ResourceMark rm;
1001     Interpreter::initialize();      // needed for interpreter entry points
1002     if (!UseSharedSpaces) {
1003       HandleMark hm(THREAD);
1004       Klass* ok = SystemDictionary::Object_klass();
1005       Universe::reinitialize_vtable_of(ok, CHECK_false);
1006       Universe::reinitialize_itables(CHECK_false);
1007     }
1008   }
1009 
1010   HandleMark hm(THREAD);
1011   // Setup preallocated empty java.lang.Class array
1012   Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
1013 
1014   // Setup preallocated OutOfMemoryError errors
1015   Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
1016   InstanceKlass* ik = InstanceKlass::cast(k);
1017   Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
1018   Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
1019   Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
1020   Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
1021   Universe::_out_of_memory_error_gc_overhead_limit =
1022     ik->allocate_instance(CHECK_false);
1023   Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
1024 
1025   // Setup preallocated cause message for delayed StackOverflowError
1026   if (StackReservedPages > 0) {
1027     Universe::_delayed_stack_overflow_error_message =
1028       java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
1029   }
1030 
1031   // Setup preallocated NullPointerException
1032   // (this is currently used for a cheap & dirty solution in compiler exception handling)
1033   k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1034   Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1035   // Setup preallocated ArithmeticException
1036   // (this is currently used for a cheap & dirty solution in compiler exception handling)
1037   k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1038   Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1039   // Virtual Machine Error for when we get into a situation we can't resolve
1040   k = SystemDictionary::resolve_or_fail(
1041     vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1042   bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1043   if (!linked) {
1044      tty->print_cr("Unable to link/verify VirtualMachineError class");
1045      return false; // initialization failed
1046   }
1047   Universe::_virtual_machine_error_instance =
1048     InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1049 
1050   Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1051 
1052   Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1053   java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1054 
1055   msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1056   java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1057   msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1058   java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1059 
1060   msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1061   java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1062 
1063   msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1064   java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1065 
1066   msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1067   java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1068 
1069   msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1070   java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1071 
1072   // Setup the array of errors that have preallocated backtrace
1073   k = Universe::_out_of_memory_error_java_heap->klass();
1074   assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1075   ik = InstanceKlass::cast(k);
1076 
1077   int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1078   Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1079   for (int i=0; i<len; i++) {
1080     oop err = ik->allocate_instance(CHECK_false);
1081     Handle err_h = Handle(THREAD, err);
1082     java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1083     Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1084   }
1085   Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1086 
1087   Universe::initialize_known_methods(CHECK_false);
1088 
1089   // This needs to be done before the first scavenge/gc, since
1090   // it's an input to soft ref clearing policy.
1091   {
1092     MutexLocker x(Heap_lock);
1093     Universe::update_heap_info_at_gc();
1094   }
1095 
1096   // ("weak") refs processing infrastructure initialization
1097   Universe::heap()->post_initialize();
1098 
1099   MemoryService::add_metaspace_memory_pools();
1100 
1101   MemoryService::set_universe_heap(Universe::heap());
1102 #if INCLUDE_CDS
1103   SharedClassUtil::initialize(CHECK_false);
1104 #endif
1105   return true;
1106 }
1107 
1108 
1109 void Universe::compute_base_vtable_size() {
1110   _base_vtable_size = ClassLoader::compute_Object_vtable();
1111 }
1112 
1113 void Universe::print_on(outputStream* st) {
1114   GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1115   st->print_cr("Heap");
1116   heap()->print_on(st);
1117 }
1118 
1119 void Universe::print_heap_at_SIGBREAK() {
1120   if (PrintHeapAtSIGBREAK) {
1121     print_on(tty);
1122     tty->cr();
1123     tty->flush();
1124   }
1125 }
1126 
1127 void Universe::print_heap_before_gc() {
1128   LogTarget(Debug, gc, heap) lt;
1129   if (lt.is_enabled()) {
1130     LogStream ls(lt);
1131     ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1132     ResourceMark rm;
1133     heap()->print_on(&ls);
1134   }
1135 }
1136 
1137 void Universe::print_heap_after_gc() {
1138   LogTarget(Debug, gc, heap) lt;
1139   if (lt.is_enabled()) {
1140     LogStream ls(lt);
1141     ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1142     ResourceMark rm;
1143     heap()->print_on(&ls);
1144   }
1145 }
1146 
1147 void Universe::initialize_verify_flags() {
1148   verify_flags = 0;
1149   const char delimiter[] = " ,";
1150 
1151   size_t length = strlen(VerifySubSet);
1152   char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1153   strncpy(subset_list, VerifySubSet, length + 1);
1154 
1155   char* token = strtok(subset_list, delimiter);
1156   while (token != NULL) {
1157     if (strcmp(token, "threads") == 0) {
1158       verify_flags |= Verify_Threads;
1159     } else if (strcmp(token, "heap") == 0) {
1160       verify_flags |= Verify_Heap;
1161     } else if (strcmp(token, "symbol_table") == 0) {
1162       verify_flags |= Verify_SymbolTable;
1163     } else if (strcmp(token, "string_table") == 0) {
1164       verify_flags |= Verify_StringTable;
1165     } else if (strcmp(token, "codecache") == 0) {
1166       verify_flags |= Verify_CodeCache;
1167     } else if (strcmp(token, "dictionary") == 0) {
1168       verify_flags |= Verify_SystemDictionary;
1169     } else if (strcmp(token, "classloader_data_graph") == 0) {
1170       verify_flags |= Verify_ClassLoaderDataGraph;
1171     } else if (strcmp(token, "metaspace") == 0) {
1172       verify_flags |= Verify_MetaspaceAux;
1173     } else if (strcmp(token, "jni_handles") == 0) {
1174       verify_flags |= Verify_JNIHandles;
1175     } else if (strcmp(token, "codecache_oops") == 0) {
1176       verify_flags |= Verify_CodeCacheOops;
1177     } else {
1178       vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1179     }
1180     token = strtok(NULL, delimiter);
1181   }
1182   FREE_C_HEAP_ARRAY(char, subset_list);
1183 }
1184 
1185 bool Universe::should_verify_subset(uint subset) {
1186   if (verify_flags & subset) {
1187     return true;
1188   }
1189   return false;
1190 }
1191 
1192 void Universe::verify(VerifyOption option, const char* prefix) {
1193   // The use of _verify_in_progress is a temporary work around for
1194   // 6320749.  Don't bother with a creating a class to set and clear
1195   // it since it is only used in this method and the control flow is
1196   // straight forward.
1197   _verify_in_progress = true;
1198 
1199   COMPILER2_PRESENT(
1200     assert(!DerivedPointerTable::is_active(),
1201          "DPT should not be active during verification "
1202          "(of thread stacks below)");
1203   )
1204 
1205   ResourceMark rm;
1206   HandleMark hm;  // Handles created during verification can be zapped
1207   _verify_count++;
1208 
1209   FormatBuffer<> title("Verifying %s", prefix);
1210   GCTraceTime(Info, gc, verify) tm(title.buffer());
1211   if (should_verify_subset(Verify_Threads)) {
1212     log_debug(gc, verify)("Threads");
1213     Threads::verify();
1214   }
1215   if (should_verify_subset(Verify_Heap)) {
1216     log_debug(gc, verify)("Heap");
1217     heap()->verify(option);
1218   }
1219   if (should_verify_subset(Verify_SymbolTable)) {
1220     log_debug(gc, verify)("SymbolTable");
1221     SymbolTable::verify();
1222   }
1223   if (should_verify_subset(Verify_StringTable)) {
1224     log_debug(gc, verify)("StringTable");
1225     StringTable::verify();
1226   }
1227   if (should_verify_subset(Verify_CodeCache)) {
1228   {
1229     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1230     log_debug(gc, verify)("CodeCache");
1231     CodeCache::verify();
1232   }
1233   }
1234   if (should_verify_subset(Verify_SystemDictionary)) {
1235     log_debug(gc, verify)("SystemDictionary");
1236     SystemDictionary::verify();
1237   }
1238 #ifndef PRODUCT
1239   if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1240     log_debug(gc, verify)("ClassLoaderDataGraph");
1241     ClassLoaderDataGraph::verify();
1242   }
1243 #endif
1244   if (should_verify_subset(Verify_MetaspaceAux)) {
1245     log_debug(gc, verify)("MetaspaceAux");
1246     MetaspaceAux::verify_free_chunks();
1247   }
1248   if (should_verify_subset(Verify_JNIHandles)) {
1249     log_debug(gc, verify)("JNIHandles");
1250     JNIHandles::verify();
1251   }
1252   if (should_verify_subset(Verify_CodeCacheOops)) {
1253     log_debug(gc, verify)("CodeCache Oops");
1254     CodeCache::verify_oops();
1255   }
1256 
1257   _verify_in_progress = false;
1258 }
1259 
1260 
1261 #ifndef PRODUCT
1262 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1263   assert(low_boundary < high_boundary, "bad interval");
1264 
1265   // decide which low-order bits we require to be clear:
1266   size_t alignSize = MinObjAlignmentInBytes;
1267   size_t min_object_size = CollectedHeap::min_fill_size();
1268 
1269   // make an inclusive limit:
1270   uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1271   uintptr_t min = (uintptr_t)low_boundary;
1272   assert(min < max, "bad interval");
1273   uintptr_t diff = max ^ min;
1274 
1275   // throw away enough low-order bits to make the diff vanish
1276   uintptr_t mask = (uintptr_t)(-1);
1277   while ((mask & diff) != 0)
1278     mask <<= 1;
1279   uintptr_t bits = (min & mask);
1280   assert(bits == (max & mask), "correct mask");
1281   // check an intermediate value between min and max, just to make sure:
1282   assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1283 
1284   // require address alignment, too:
1285   mask |= (alignSize - 1);
1286 
1287   if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1288     assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1289   }
1290   _verify_oop_mask = mask;
1291   _verify_oop_bits = bits;
1292 }
1293 
1294 // Oop verification (see MacroAssembler::verify_oop)
1295 
1296 uintptr_t Universe::verify_oop_mask() {
1297   MemRegion m = heap()->reserved_region();
1298   calculate_verify_data(m.start(), m.end());
1299   return _verify_oop_mask;
1300 }
1301 
1302 uintptr_t Universe::verify_oop_bits() {
1303   MemRegion m = heap()->reserved_region();
1304   calculate_verify_data(m.start(), m.end());
1305   return _verify_oop_bits;
1306 }
1307 
1308 uintptr_t Universe::verify_mark_mask() {
1309   return markOopDesc::lock_mask_in_place;
1310 }
1311 
1312 uintptr_t Universe::verify_mark_bits() {
1313   intptr_t mask = verify_mark_mask();
1314   intptr_t bits = (intptr_t)markOopDesc::prototype();
1315   assert((bits & ~mask) == 0, "no stray header bits");
1316   return bits;
1317 }
1318 #endif // PRODUCT
1319 
1320 
1321 void Universe::compute_verify_oop_data() {
1322   verify_oop_mask();
1323   verify_oop_bits();
1324   verify_mark_mask();
1325   verify_mark_bits();
1326 }
1327 
1328 
1329 void LatestMethodCache::init(Klass* k, Method* m) {
1330   if (!UseSharedSpaces) {
1331     _klass = k;
1332   }
1333 #ifndef PRODUCT
1334   else {
1335     // sharing initilization should have already set up _klass
1336     assert(_klass != NULL, "just checking");
1337   }
1338 #endif
1339 
1340   _method_idnum = m->method_idnum();
1341   assert(_method_idnum >= 0, "sanity check");
1342 }
1343 
1344 
1345 Method* LatestMethodCache::get_method() {
1346   if (klass() == NULL) return NULL;
1347   InstanceKlass* ik = InstanceKlass::cast(klass());
1348   Method* m = ik->method_with_idnum(method_idnum());
1349   assert(m != NULL, "sanity check");
1350   return m;
1351 }
1352 
1353 
1354 #ifdef ASSERT
1355 // Release dummy object(s) at bottom of heap
1356 bool Universe::release_fullgc_alot_dummy() {
1357   MutexLocker ml(FullGCALot_lock);
1358   if (_fullgc_alot_dummy_array != NULL) {
1359     if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1360       // No more dummies to release, release entire array instead
1361       _fullgc_alot_dummy_array = NULL;
1362       return false;
1363     }
1364     if (!UseConcMarkSweepGC) {
1365       // Release dummy at bottom of old generation
1366       _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1367     }
1368     // Release dummy at bottom of permanent generation
1369     _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1370   }
1371   return true;
1372 }
1373 
1374 #endif // ASSERT
--- EOF ---