rev 52361 : [mq]: webrev.2.incr

   1 /*
   2  * Copyright (c) 1997, 2018, 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/classLoaderDataGraph.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/collectedHeap.inline.hpp"
  36 #include "gc/shared/gcArguments.hpp"
  37 #include "gc/shared/gcConfig.hpp"
  38 #include "gc/shared/gcTraceTime.inline.hpp"
  39 #include "interpreter/interpreter.hpp"
  40 #include "logging/log.hpp"
  41 #include "logging/logStream.hpp"
  42 #include "memory/heapShared.hpp"
  43 #include "memory/filemap.hpp"
  44 #include "memory/metadataFactory.hpp"
  45 #include "memory/metaspaceClosure.hpp"
  46 #include "memory/metaspaceCounters.hpp"
  47 #include "memory/metaspaceShared.hpp"
  48 #include "memory/oopFactory.hpp"
  49 #include "memory/resourceArea.hpp"
  50 #include "memory/universe.hpp"
  51 #include "memory/universe.hpp"
  52 #include "oops/constantPool.hpp"
  53 #include "oops/instanceClassLoaderKlass.hpp"
  54 #include "oops/instanceKlass.hpp"
  55 #include "oops/instanceMirrorKlass.hpp"
  56 #include "oops/instanceRefKlass.hpp"
  57 #include "oops/objArrayOop.inline.hpp"
  58 #include "oops/oop.inline.hpp"
  59 #include "oops/typeArrayKlass.hpp"
  60 #include "prims/resolvedMethodTable.hpp"
  61 #include "runtime/arguments.hpp"
  62 #include "runtime/atomic.hpp"
  63 #include "runtime/flags/flagSetting.hpp"
  64 #include "runtime/flags/jvmFlagConstraintList.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 
  86 // Known objects
  87 Klass* Universe::_typeArrayKlassObjs[T_LONG+1]        = { NULL /*, NULL...*/ };
  88 Klass* Universe::_objectArrayKlassObj                 = NULL;
  89 oop Universe::_int_mirror                             = NULL;
  90 oop Universe::_float_mirror                           = NULL;
  91 oop Universe::_double_mirror                          = NULL;
  92 oop Universe::_byte_mirror                            = NULL;
  93 oop Universe::_bool_mirror                            = NULL;
  94 oop Universe::_char_mirror                            = NULL;
  95 oop Universe::_long_mirror                            = NULL;
  96 oop Universe::_short_mirror                           = NULL;
  97 oop Universe::_void_mirror                            = NULL;
  98 oop Universe::_mirrors[T_VOID+1]                      = { NULL /*, NULL...*/ };
  99 oop Universe::_main_thread_group                      = NULL;
 100 oop Universe::_system_thread_group                    = NULL;
 101 objArrayOop Universe::_the_empty_class_klass_array    = NULL;
 102 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
 103 oop Universe::_the_null_sentinel                      = NULL;
 104 oop Universe::_the_null_string                        = NULL;
 105 oop Universe::_the_min_jint_string                   = NULL;
 106 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
 107 LatestMethodCache* Universe::_loader_addClass_cache    = NULL;
 108 LatestMethodCache* Universe::_pd_implies_cache         = NULL;
 109 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
 110 LatestMethodCache* Universe::_do_stack_walk_cache     = NULL;
 111 oop Universe::_out_of_memory_error_java_heap          = NULL;
 112 oop Universe::_out_of_memory_error_metaspace          = NULL;
 113 oop Universe::_out_of_memory_error_class_metaspace    = NULL;
 114 oop Universe::_out_of_memory_error_array_size         = NULL;
 115 oop Universe::_out_of_memory_error_gc_overhead_limit  = NULL;
 116 oop Universe::_out_of_memory_error_realloc_objects    = NULL;
 117 oop Universe::_out_of_memory_error_retry              = NULL;
 118 oop Universe::_delayed_stack_overflow_error_message   = NULL;
 119 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
 120 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
 121 bool Universe::_verify_in_progress                    = false;
 122 long Universe::verify_flags                           = Universe::Verify_All;
 123 oop Universe::_null_ptr_exception_instance            = NULL;
 124 oop Universe::_arithmetic_exception_instance          = NULL;
 125 oop Universe::_virtual_machine_error_instance         = NULL;
 126 oop Universe::_vm_exception                           = NULL;
 127 oop Universe::_reference_pending_list                 = NULL;
 128 
 129 Array<int>* Universe::_the_empty_int_array            = NULL;
 130 Array<u2>* Universe::_the_empty_short_array           = NULL;
 131 Array<Klass*>* Universe::_the_empty_klass_array     = NULL;
 132 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array  = NULL;
 133 Array<Method*>* Universe::_the_empty_method_array   = NULL;
 134 
 135 // These variables are guarded by FullGCALot_lock.
 136 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
 137 debug_only(int Universe::_fullgc_alot_dummy_next      = 0;)
 138 
 139 // Heap
 140 int             Universe::_verify_count = 0;
 141 
 142 // Oop verification (see MacroAssembler::verify_oop)
 143 uintptr_t       Universe::_verify_oop_mask = 0;
 144 uintptr_t       Universe::_verify_oop_bits = (uintptr_t) -1;
 145 
 146 int             Universe::_base_vtable_size = 0;
 147 bool            Universe::_bootstrapping = false;
 148 bool            Universe::_module_initialized = false;
 149 bool            Universe::_fully_initialized = false;
 150 
 151 size_t          Universe::_heap_capacity_at_last_gc;
 152 size_t          Universe::_heap_used_at_last_gc = 0;
 153 
 154 CollectedHeap*  Universe::_collectedHeap = NULL;
 155 
 156 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
 157 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
 158 address Universe::_narrow_ptrs_base;
 159 uint64_t Universe::_narrow_klass_range = (uint64_t(max_juint)+1);
 160 
 161 void Universe::basic_type_classes_do(void f(Klass*)) {
 162   for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
 163     f(_typeArrayKlassObjs[i]);
 164   }
 165 }
 166 
 167 void Universe::basic_type_classes_do(KlassClosure *closure) {
 168   for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
 169     closure->do_klass(_typeArrayKlassObjs[i]);
 170   }
 171 }
 172 
 173 void Universe::oops_do(OopClosure* f) {
 174 
 175   f->do_oop((oop*) &_int_mirror);
 176   f->do_oop((oop*) &_float_mirror);
 177   f->do_oop((oop*) &_double_mirror);
 178   f->do_oop((oop*) &_byte_mirror);
 179   f->do_oop((oop*) &_bool_mirror);
 180   f->do_oop((oop*) &_char_mirror);
 181   f->do_oop((oop*) &_long_mirror);
 182   f->do_oop((oop*) &_short_mirror);
 183   f->do_oop((oop*) &_void_mirror);
 184 
 185   for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
 186     f->do_oop((oop*) &_mirrors[i]);
 187   }
 188   assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
 189 
 190   f->do_oop((oop*)&_the_empty_class_klass_array);
 191   f->do_oop((oop*)&_the_null_sentinel);
 192   f->do_oop((oop*)&_the_null_string);
 193   f->do_oop((oop*)&_the_min_jint_string);
 194   f->do_oop((oop*)&_out_of_memory_error_java_heap);
 195   f->do_oop((oop*)&_out_of_memory_error_metaspace);
 196   f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
 197   f->do_oop((oop*)&_out_of_memory_error_array_size);
 198   f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
 199   f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
 200   f->do_oop((oop*)&_out_of_memory_error_retry);
 201   f->do_oop((oop*)&_delayed_stack_overflow_error_message);
 202   f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
 203   f->do_oop((oop*)&_null_ptr_exception_instance);
 204   f->do_oop((oop*)&_arithmetic_exception_instance);
 205   f->do_oop((oop*)&_virtual_machine_error_instance);
 206   f->do_oop((oop*)&_main_thread_group);
 207   f->do_oop((oop*)&_system_thread_group);
 208   f->do_oop((oop*)&_vm_exception);
 209   f->do_oop((oop*)&_reference_pending_list);
 210   debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
 211 }
 212 
 213 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
 214   it->push(&_klass);
 215 }
 216 
 217 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
 218   for (int i = 0; i < T_LONG+1; i++) {
 219     it->push(&_typeArrayKlassObjs[i]);
 220   }
 221   it->push(&_objectArrayKlassObj);
 222 
 223   it->push(&_the_empty_int_array);
 224   it->push(&_the_empty_short_array);
 225   it->push(&_the_empty_klass_array);
 226   it->push(&_the_empty_instance_klass_array);
 227   it->push(&_the_empty_method_array);
 228   it->push(&_the_array_interfaces_array);
 229 
 230   _finalizer_register_cache->metaspace_pointers_do(it);
 231   _loader_addClass_cache->metaspace_pointers_do(it);
 232   _pd_implies_cache->metaspace_pointers_do(it);
 233   _throw_illegal_access_error_cache->metaspace_pointers_do(it);
 234   _do_stack_walk_cache->metaspace_pointers_do(it);
 235 }
 236 
 237 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
 238 void Universe::serialize(SerializeClosure* f) {
 239 
 240   for (int i = 0; i < T_LONG+1; i++) {
 241     f->do_ptr((void**)&_typeArrayKlassObjs[i]);
 242   }
 243 
 244   f->do_ptr((void**)&_objectArrayKlassObj);
 245 #if INCLUDE_CDS_JAVA_HEAP
 246 #ifdef ASSERT
 247   if (DumpSharedSpaces && !HeapShared::is_heap_object_archiving_allowed()) {
 248     assert(_int_mirror == NULL    && _float_mirror == NULL &&
 249            _double_mirror == NULL && _byte_mirror == NULL  &&
 250            _bool_mirror == NULL   && _char_mirror == NULL  &&
 251            _long_mirror == NULL   && _short_mirror == NULL &&
 252            _void_mirror == NULL, "mirrors should be NULL");
 253   }
 254 #endif
 255   f->do_oop(&_int_mirror);
 256   f->do_oop(&_float_mirror);
 257   f->do_oop(&_double_mirror);
 258   f->do_oop(&_byte_mirror);
 259   f->do_oop(&_bool_mirror);
 260   f->do_oop(&_char_mirror);
 261   f->do_oop(&_long_mirror);
 262   f->do_oop(&_short_mirror);
 263   f->do_oop(&_void_mirror);
 264 #endif
 265 
 266   f->do_ptr((void**)&_the_array_interfaces_array);
 267   f->do_ptr((void**)&_the_empty_int_array);
 268   f->do_ptr((void**)&_the_empty_short_array);
 269   f->do_ptr((void**)&_the_empty_method_array);
 270   f->do_ptr((void**)&_the_empty_klass_array);
 271   f->do_ptr((void**)&_the_empty_instance_klass_array);
 272   _finalizer_register_cache->serialize(f);
 273   _loader_addClass_cache->serialize(f);
 274   _pd_implies_cache->serialize(f);
 275   _throw_illegal_access_error_cache->serialize(f);
 276   _do_stack_walk_cache->serialize(f);
 277 }
 278 
 279 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
 280   if (size < alignment || size % alignment != 0) {
 281     vm_exit_during_initialization(
 282       err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
 283   }
 284 }
 285 
 286 void initialize_basic_type_klass(Klass* k, TRAPS) {
 287   Klass* ok = SystemDictionary::Object_klass();
 288 #if INCLUDE_CDS
 289   if (UseSharedSpaces) {
 290     ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
 291     assert(k->super() == ok, "u3");
 292     k->restore_unshareable_info(loader_data, Handle(), CHECK);
 293   } else
 294 #endif
 295   {
 296     k->initialize_supers(ok, NULL, CHECK);
 297   }
 298   k->append_to_sibling_list();
 299 }
 300 
 301 void Universe::genesis(TRAPS) {
 302   ResourceMark rm;
 303 
 304   { FlagSetting fs(_bootstrapping, true);
 305 
 306     { MutexLocker mc(Compile_lock);
 307 
 308       java_lang_Class::allocate_fixup_lists();
 309 
 310       // determine base vtable size; without that we cannot create the array klasses
 311       compute_base_vtable_size();
 312 
 313       if (!UseSharedSpaces) {
 314         for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
 315           _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
 316         }
 317 
 318         ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
 319 
 320         _the_array_interfaces_array     = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
 321         _the_empty_int_array            = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
 322         _the_empty_short_array          = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
 323         _the_empty_method_array         = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
 324         _the_empty_klass_array          = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
 325         _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
 326       }
 327     }
 328 
 329     vmSymbols::initialize(CHECK);
 330 
 331     SystemDictionary::initialize(CHECK);
 332 
 333     Klass* ok = SystemDictionary::Object_klass();
 334 
 335     _the_null_string            = StringTable::intern("null", CHECK);
 336     _the_min_jint_string       = StringTable::intern("-2147483648", CHECK);
 337 
 338 #if INCLUDE_CDS
 339     if (UseSharedSpaces) {
 340       // Verify shared interfaces array.
 341       assert(_the_array_interfaces_array->at(0) ==
 342              SystemDictionary::Cloneable_klass(), "u3");
 343       assert(_the_array_interfaces_array->at(1) ==
 344              SystemDictionary::Serializable_klass(), "u3");
 345     } else
 346 #endif
 347     {
 348       // Set up shared interfaces array.  (Do this before supers are set up.)
 349       _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
 350       _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
 351     }
 352 
 353     initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
 354     initialize_basic_type_klass(charArrayKlassObj(), CHECK);
 355     initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
 356     initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
 357     initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
 358     initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
 359     initialize_basic_type_klass(intArrayKlassObj(), CHECK);
 360     initialize_basic_type_klass(longArrayKlassObj(), CHECK);
 361   } // end of core bootstrapping
 362 
 363   {
 364     Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
 365     _the_null_sentinel = tns();
 366   }
 367 
 368   // Maybe this could be lifted up now that object array can be initialized
 369   // during the bootstrapping.
 370 
 371   // OLD
 372   // Initialize _objectArrayKlass after core bootstraping to make
 373   // sure the super class is set up properly for _objectArrayKlass.
 374   // ---
 375   // NEW
 376   // Since some of the old system object arrays have been converted to
 377   // ordinary object arrays, _objectArrayKlass will be loaded when
 378   // SystemDictionary::initialize(CHECK); is run. See the extra check
 379   // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
 380   _objectArrayKlassObj = InstanceKlass::
 381     cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
 382   // OLD
 383   // Add the class to the class hierarchy manually to make sure that
 384   // its vtable is initialized after core bootstrapping is completed.
 385   // ---
 386   // New
 387   // Have already been initialized.
 388   _objectArrayKlassObj->append_to_sibling_list();
 389 
 390   #ifdef ASSERT
 391   if (FullGCALot) {
 392     // Allocate an array of dummy objects.
 393     // We'd like these to be at the bottom of the old generation,
 394     // so that when we free one and then collect,
 395     // (almost) the whole heap moves
 396     // and we find out if we actually update all the oops correctly.
 397     // But we can't allocate directly in the old generation,
 398     // so we allocate wherever, and hope that the first collection
 399     // moves these objects to the bottom of the old generation.
 400     // We can allocate directly in the permanent generation, so we do.
 401     int size;
 402     if (UseConcMarkSweepGC) {
 403       log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
 404       size = FullGCALotDummies;
 405     } else {
 406       size = FullGCALotDummies * 2;
 407     }
 408     objArrayOop    naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
 409     objArrayHandle dummy_array(THREAD, naked_array);
 410     int i = 0;
 411     while (i < size) {
 412         // Allocate dummy in old generation
 413       oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
 414       dummy_array->obj_at_put(i++, dummy);
 415     }
 416     {
 417       // Only modify the global variable inside the mutex.
 418       // If we had a race to here, the other dummy_array instances
 419       // and their elements just get dropped on the floor, which is fine.
 420       MutexLocker ml(FullGCALot_lock);
 421       if (_fullgc_alot_dummy_array == NULL) {
 422         _fullgc_alot_dummy_array = dummy_array();
 423       }
 424     }
 425     assert(i == _fullgc_alot_dummy_array->length(), "just checking");
 426   }
 427   #endif
 428 }
 429 
 430 void Universe::initialize_basic_type_mirrors(TRAPS) {
 431 #if INCLUDE_CDS_JAVA_HEAP
 432     if (UseSharedSpaces &&
 433         HeapShared::open_archive_heap_region_mapped() &&
 434         _int_mirror != NULL) {
 435       assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity");
 436       assert(_float_mirror != NULL && _double_mirror != NULL &&
 437              _byte_mirror  != NULL && _byte_mirror   != NULL &&
 438              _bool_mirror  != NULL && _char_mirror   != NULL &&
 439              _long_mirror  != NULL && _short_mirror  != NULL &&
 440              _void_mirror  != NULL, "Sanity");
 441     } else
 442 #endif
 443     {
 444       _int_mirror     =
 445         java_lang_Class::create_basic_type_mirror("int",    T_INT, CHECK);
 446       _float_mirror   =
 447         java_lang_Class::create_basic_type_mirror("float",  T_FLOAT,   CHECK);
 448       _double_mirror  =
 449         java_lang_Class::create_basic_type_mirror("double", T_DOUBLE,  CHECK);
 450       _byte_mirror    =
 451         java_lang_Class::create_basic_type_mirror("byte",   T_BYTE, CHECK);
 452       _bool_mirror    =
 453         java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
 454       _char_mirror    =
 455         java_lang_Class::create_basic_type_mirror("char",   T_CHAR, CHECK);
 456       _long_mirror    =
 457         java_lang_Class::create_basic_type_mirror("long",   T_LONG, CHECK);
 458       _short_mirror   =
 459         java_lang_Class::create_basic_type_mirror("short",  T_SHORT,   CHECK);
 460       _void_mirror    =
 461         java_lang_Class::create_basic_type_mirror("void",   T_VOID, CHECK);
 462     }
 463 
 464     _mirrors[T_INT]     = _int_mirror;
 465     _mirrors[T_FLOAT]   = _float_mirror;
 466     _mirrors[T_DOUBLE]  = _double_mirror;
 467     _mirrors[T_BYTE]    = _byte_mirror;
 468     _mirrors[T_BOOLEAN] = _bool_mirror;
 469     _mirrors[T_CHAR]    = _char_mirror;
 470     _mirrors[T_LONG]    = _long_mirror;
 471     _mirrors[T_SHORT]   = _short_mirror;
 472     _mirrors[T_VOID]    = _void_mirror;
 473   //_mirrors[T_OBJECT]  = _object_klass->java_mirror();
 474   //_mirrors[T_ARRAY]   = _object_klass->java_mirror();
 475 }
 476 
 477 void Universe::fixup_mirrors(TRAPS) {
 478   // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
 479   // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
 480   // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
 481   // that the number of objects allocated at this point is very small.
 482   assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
 483   HandleMark hm(THREAD);
 484 
 485   if (!UseSharedSpaces) {
 486     // Cache the start of the static fields
 487     InstanceMirrorKlass::init_offset_of_static_fields();
 488   }
 489 
 490   GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
 491   int list_length = list->length();
 492   for (int i = 0; i < list_length; i++) {
 493     Klass* k = list->at(i);
 494     assert(k->is_klass(), "List should only hold classes");
 495     EXCEPTION_MARK;
 496     java_lang_Class::fixup_mirror(k, CATCH);
 497   }
 498   delete java_lang_Class::fixup_mirror_list();
 499   java_lang_Class::set_fixup_mirror_list(NULL);
 500 }
 501 
 502 #define assert_pll_locked(test) \
 503   assert(Heap_lock->test(), "Reference pending list access requires lock")
 504 
 505 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
 506 
 507 oop Universe::reference_pending_list() {
 508   if (Thread::current()->is_VM_thread()) {
 509     assert_pll_locked(is_locked);
 510   } else {
 511     assert_pll_ownership();
 512   }
 513   return _reference_pending_list;
 514 }
 515 
 516 void Universe::set_reference_pending_list(oop list) {
 517   assert_pll_ownership();
 518   _reference_pending_list = list;
 519 }
 520 
 521 bool Universe::has_reference_pending_list() {
 522   assert_pll_ownership();
 523   return _reference_pending_list != NULL;
 524 }
 525 
 526 oop Universe::swap_reference_pending_list(oop list) {
 527   assert_pll_locked(is_locked);
 528   return Atomic::xchg(list, &_reference_pending_list);
 529 }
 530 
 531 #undef assert_pll_locked
 532 #undef assert_pll_ownership
 533 
 534 // initialize_vtable could cause gc if
 535 // 1) we specified true to initialize_vtable and
 536 // 2) this ran after gc was enabled
 537 // In case those ever change we use handles for oops
 538 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
 539   // init vtable of k and all subclasses
 540   ko->vtable().initialize_vtable(false, CHECK);
 541   if (ko->is_instance_klass()) {
 542     for (Klass* sk = ko->subklass();
 543          sk != NULL;
 544          sk = sk->next_sibling()) {
 545       reinitialize_vtable_of(sk, CHECK);
 546     }
 547   }
 548 }
 549 
 550 
 551 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
 552   k->itable().initialize_itable(false, CHECK);
 553 }
 554 
 555 
 556 void Universe::reinitialize_itables(TRAPS) {
 557   MutexLocker mcld(ClassLoaderDataGraph_lock);
 558   ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
 559 }
 560 
 561 
 562 bool Universe::on_page_boundary(void* addr) {
 563   return is_aligned(addr, os::vm_page_size());
 564 }
 565 
 566 
 567 bool Universe::should_fill_in_stack_trace(Handle throwable) {
 568   // never attempt to fill in the stack trace of preallocated errors that do not have
 569   // backtrace. These errors are kept alive forever and may be "re-used" when all
 570   // preallocated errors with backtrace have been consumed. Also need to avoid
 571   // a potential loop which could happen if an out of memory occurs when attempting
 572   // to allocate the backtrace.
 573   return ((!oopDesc::equals(throwable(), Universe::_out_of_memory_error_java_heap)) &&
 574           (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_metaspace))  &&
 575           (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_class_metaspace))  &&
 576           (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_array_size)) &&
 577           (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_gc_overhead_limit)) &&
 578           (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_realloc_objects)) &&
 579           (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_retry)));
 580 }
 581 
 582 
 583 oop Universe::gen_out_of_memory_error(oop default_err) {
 584   // generate an out of memory error:
 585   // - if there is a preallocated error and stack traces are available
 586   //   (j.l.Throwable is initialized), then return the preallocated
 587   //   error with a filled in stack trace, and with the message
 588   //   provided by the default error.
 589   // - otherwise, return the default error, without a stack trace.
 590   int next;
 591   if ((_preallocated_out_of_memory_error_avail_count > 0) &&
 592       SystemDictionary::Throwable_klass()->is_initialized()) {
 593     next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
 594     assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
 595   } else {
 596     next = -1;
 597   }
 598   if (next < 0) {
 599     // all preallocated errors have been used.
 600     // return default
 601     return default_err;
 602   } else {
 603     Thread* THREAD = Thread::current();
 604     Handle default_err_h(THREAD, default_err);
 605     // get the error object at the slot and set set it to NULL so that the
 606     // array isn't keeping it alive anymore.
 607     Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
 608     assert(exc() != NULL, "slot has been used already");
 609     preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
 610 
 611     // use the message from the default error
 612     oop msg = java_lang_Throwable::message(default_err_h());
 613     assert(msg != NULL, "no message");
 614     java_lang_Throwable::set_message(exc(), msg);
 615 
 616     // populate the stack trace and return it.
 617     java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
 618     return exc();
 619   }
 620 }
 621 
 622 intptr_t Universe::_non_oop_bits = 0;
 623 
 624 void* Universe::non_oop_word() {
 625   // Neither the high bits nor the low bits of this value is allowed
 626   // to look like (respectively) the high or low bits of a real oop.
 627   //
 628   // High and low are CPU-specific notions, but low always includes
 629   // the low-order bit.  Since oops are always aligned at least mod 4,
 630   // setting the low-order bit will ensure that the low half of the
 631   // word will never look like that of a real oop.
 632   //
 633   // Using the OS-supplied non-memory-address word (usually 0 or -1)
 634   // will take care of the high bits, however many there are.
 635 
 636   if (_non_oop_bits == 0) {
 637     _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
 638   }
 639 
 640   return (void*)_non_oop_bits;
 641 }
 642 
 643 jint universe_init() {
 644   assert(!Universe::_fully_initialized, "called after initialize_vtables");
 645   guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
 646          "LogHeapWordSize is incorrect.");
 647   guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
 648   guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
 649             "oop size is not not a multiple of HeapWord size");
 650 
 651   TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
 652 
 653   JavaClasses::compute_hard_coded_offsets();
 654 
 655   jint status = Universe::initialize_heap();
 656   if (status != JNI_OK) {
 657     return status;
 658   }
 659 
 660   SystemDictionary::initialize_oop_storage();
 661 
 662   Metaspace::global_initialize();
 663 
 664   // Initialize performance counters for metaspaces
 665   MetaspaceCounters::initialize_performance_counters();
 666   CompressedClassSpaceCounters::initialize_performance_counters();
 667 
 668   AOTLoader::universe_init();
 669 
 670   // Checks 'AfterMemoryInit' constraints.
 671   if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) {
 672     return JNI_EINVAL;
 673   }
 674 
 675   // Create memory for metadata.  Must be after initializing heap for
 676   // DumpSharedSpaces.
 677   ClassLoaderData::init_null_class_loader_data();
 678 
 679   // We have a heap so create the Method* caches before
 680   // Metaspace::initialize_shared_spaces() tries to populate them.
 681   Universe::_finalizer_register_cache = new LatestMethodCache();
 682   Universe::_loader_addClass_cache    = new LatestMethodCache();
 683   Universe::_pd_implies_cache         = new LatestMethodCache();
 684   Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
 685   Universe::_do_stack_walk_cache = new LatestMethodCache();
 686 
 687 #if INCLUDE_CDS
 688   if (UseSharedSpaces) {
 689     // Read the data structures supporting the shared spaces (shared
 690     // system dictionary, symbol table, etc.).  After that, access to
 691     // the file (other than the mapped regions) is no longer needed, and
 692     // the file is closed. Closing the file does not affect the
 693     // currently mapped regions.
 694     MetaspaceShared::initialize_shared_spaces();
 695     StringTable::create_table();
 696   } else
 697 #endif
 698   {
 699     SymbolTable::create_table();
 700     StringTable::create_table();
 701 
 702 #if INCLUDE_CDS
 703     if (DumpSharedSpaces) {
 704       MetaspaceShared::prepare_for_dumping();
 705     }
 706 #endif
 707   }
 708   if (strlen(VerifySubSet) > 0) {
 709     Universe::initialize_verify_flags();
 710   }
 711 
 712   ResolvedMethodTable::create_table();
 713 
 714   return JNI_OK;
 715 }
 716 
 717 CollectedHeap* Universe::create_heap() {
 718   assert(_collectedHeap == NULL, "Heap already created");
 719   return GCConfig::arguments()->create_heap();
 720 }
 721 
 722 // Choose the heap base address and oop encoding mode
 723 // when compressed oops are used:
 724 // Unscaled  - Use 32-bits oops without encoding when
 725 //     NarrowOopHeapBaseMin + heap_size < 4Gb
 726 // ZeroBased - Use zero based compressed oops with encoding when
 727 //     NarrowOopHeapBaseMin + heap_size < 32Gb
 728 // HeapBased - Use compressed oops with heap base + encoding.
 729 
 730 jint Universe::initialize_heap() {
 731   _collectedHeap = create_heap();
 732   jint status = _collectedHeap->initialize();
 733   if (status != JNI_OK) {
 734     return status;
 735   }
 736   log_info(gc)("Using %s", _collectedHeap->name());
 737 
 738   ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
 739 
 740 #ifdef _LP64
 741   if (UseCompressedOops) {
 742     // Subtract a page because something can get allocated at heap base.
 743     // This also makes implicit null checking work, because the
 744     // memory+1 page below heap_base needs to cause a signal.
 745     // See needs_explicit_null_check.
 746     // Only set the heap base for compressed oops because it indicates
 747     // compressed oops for pstack code.
 748     if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
 749       // Didn't reserve heap below 4Gb.  Must shift.
 750       Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
 751     }
 752     if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
 753       // Did reserve heap below 32Gb. Can use base == 0;
 754       Universe::set_narrow_oop_base(0);
 755     }
 756     AOTLoader::set_narrow_oop_shift();
 757 
 758     Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
 759 
 760     LogTarget(Info, gc, heap, coops) lt;
 761     if (lt.is_enabled()) {
 762       ResourceMark rm;
 763       LogStream ls(lt);
 764       Universe::print_compressed_oops_mode(&ls);
 765     }
 766 
 767     // Tell tests in which mode we run.
 768     Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
 769                                                    narrow_oop_mode_to_string(narrow_oop_mode()),
 770                                                    false));
 771   }
 772   // Universe::narrow_oop_base() is one page below the heap.
 773   assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
 774          os::vm_page_size()) ||
 775          Universe::narrow_oop_base() == NULL, "invalid value");
 776   assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
 777          Universe::narrow_oop_shift() == 0, "invalid value");
 778 #endif
 779 
 780   // We will never reach the CATCH below since Exceptions::_throw will cause
 781   // the VM to exit if an exception is thrown during initialization
 782 
 783   if (UseTLAB) {
 784     assert(Universe::heap()->supports_tlab_allocation(),
 785            "Should support thread-local allocation buffers");
 786     ThreadLocalAllocBuffer::startup_initialization();
 787   }
 788   return JNI_OK;
 789 }
 790 
 791 void Universe::print_compressed_oops_mode(outputStream* st) {
 792   st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
 793             p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
 794 
 795   st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
 796 
 797   if (Universe::narrow_oop_base() != 0) {
 798     st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
 799   }
 800 
 801   if (Universe::narrow_oop_shift() != 0) {
 802     st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
 803   }
 804 
 805   if (!Universe::narrow_oop_use_implicit_null_checks()) {
 806     st->print(", no protected page in front of the heap");
 807   }
 808   st->cr();
 809 }
 810 
 811 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
 812 
 813   assert(alignment <= Arguments::conservative_max_heap_alignment(),
 814          "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
 815          alignment, Arguments::conservative_max_heap_alignment());
 816 
 817   size_t total_reserved = align_up(heap_size, alignment);
 818   assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
 819       "heap size is too big for compressed oops");
 820 
 821   bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
 822   assert(!UseLargePages
 823       || UseParallelGC
 824       || use_large_pages, "Wrong alignment to use large pages");
 825 
 826   // Now create the space.
 827   ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
 828 
 829   if (total_rs.is_reserved()) {
 830     assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
 831            "must be exactly of required size and alignment");
 832     // We are good.
 833 
 834     if (UseCompressedOops) {
 835       // Universe::initialize_heap() will reset this to NULL if unscaled
 836       // or zero-based narrow oops are actually used.
 837       // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
 838       Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
 839     }
 840 
 841     if (AllocateHeapAt != NULL) {
 842       log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
 843     }
 844     return total_rs;
 845   }
 846 
 847   vm_exit_during_initialization(
 848     err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
 849             total_reserved/K));
 850 
 851   // satisfy compiler
 852   ShouldNotReachHere();
 853   return ReservedHeapSpace(0, 0, false);
 854 }
 855 
 856 
 857 // It's the caller's responsibility to ensure glitch-freedom
 858 // (if required).
 859 void Universe::update_heap_info_at_gc() {
 860   _heap_capacity_at_last_gc = heap()->capacity();
 861   _heap_used_at_last_gc     = heap()->used();
 862 }
 863 
 864 
 865 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
 866   switch (mode) {
 867     case UnscaledNarrowOop:
 868       return "32-bit";
 869     case ZeroBasedNarrowOop:
 870       return "Zero based";
 871     case DisjointBaseNarrowOop:
 872       return "Non-zero disjoint base";
 873     case HeapBasedNarrowOop:
 874       return "Non-zero based";
 875     default:
 876       ShouldNotReachHere();
 877       return "";
 878   }
 879 }
 880 
 881 
 882 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
 883   if (narrow_oop_base_disjoint()) {
 884     return DisjointBaseNarrowOop;
 885   }
 886 
 887   if (narrow_oop_base() != 0) {
 888     return HeapBasedNarrowOop;
 889   }
 890 
 891   if (narrow_oop_shift() != 0) {
 892     return ZeroBasedNarrowOop;
 893   }
 894 
 895   return UnscaledNarrowOop;
 896 }
 897 
 898 void initialize_known_method(LatestMethodCache* method_cache,
 899                              InstanceKlass* ik,
 900                              const char* method,
 901                              Symbol* signature,
 902                              bool is_static, TRAPS)
 903 {
 904   TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
 905   Method* m = NULL;
 906   // The klass must be linked before looking up the method.
 907   if (!ik->link_class_or_fail(THREAD) ||
 908       ((m = ik->find_method(name, signature)) == NULL) ||
 909       is_static != m->is_static()) {
 910     ResourceMark rm(THREAD);
 911     // NoSuchMethodException doesn't actually work because it tries to run the
 912     // <init> function before java_lang_Class is linked. Print error and exit.
 913     vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
 914                                  ik->name()->as_C_string(), method));
 915   }
 916   method_cache->init(ik, m);
 917 }
 918 
 919 void Universe::initialize_known_methods(TRAPS) {
 920   // Set up static method for registering finalizers
 921   initialize_known_method(_finalizer_register_cache,
 922                           SystemDictionary::Finalizer_klass(),
 923                           "register",
 924                           vmSymbols::object_void_signature(), true, CHECK);
 925 
 926   initialize_known_method(_throw_illegal_access_error_cache,
 927                           SystemDictionary::internal_Unsafe_klass(),
 928                           "throwIllegalAccessError",
 929                           vmSymbols::void_method_signature(), true, CHECK);
 930 
 931   // Set up method for registering loaded classes in class loader vector
 932   initialize_known_method(_loader_addClass_cache,
 933                           SystemDictionary::ClassLoader_klass(),
 934                           "addClass",
 935                           vmSymbols::class_void_signature(), false, CHECK);
 936 
 937   // Set up method for checking protection domain
 938   initialize_known_method(_pd_implies_cache,
 939                           SystemDictionary::ProtectionDomain_klass(),
 940                           "impliesCreateAccessControlContext",
 941                           vmSymbols::void_boolean_signature(), false, CHECK);
 942 
 943   // Set up method for stack walking
 944   initialize_known_method(_do_stack_walk_cache,
 945                           SystemDictionary::AbstractStackWalker_klass(),
 946                           "doStackWalk",
 947                           vmSymbols::doStackWalk_signature(), false, CHECK);
 948 }
 949 
 950 void universe2_init() {
 951   EXCEPTION_MARK;
 952   Universe::genesis(CATCH);
 953 }
 954 
 955 // Set after initialization of the module runtime, call_initModuleRuntime
 956 void universe_post_module_init() {
 957   Universe::_module_initialized = true;
 958 }
 959 
 960 bool universe_post_init() {
 961   assert(!is_init_completed(), "Error: initialization not yet completed!");
 962   Universe::_fully_initialized = true;
 963   EXCEPTION_MARK;
 964   { ResourceMark rm;
 965     Interpreter::initialize();      // needed for interpreter entry points
 966     if (!UseSharedSpaces) {
 967       HandleMark hm(THREAD);
 968       Klass* ok = SystemDictionary::Object_klass();
 969       Universe::reinitialize_vtable_of(ok, CHECK_false);
 970       Universe::reinitialize_itables(CHECK_false);
 971     }
 972   }
 973 
 974   HandleMark hm(THREAD);
 975   // Setup preallocated empty java.lang.Class array
 976   Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
 977 
 978   // Setup preallocated OutOfMemoryError errors
 979   Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
 980   InstanceKlass* ik = InstanceKlass::cast(k);
 981   Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
 982   Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
 983   Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
 984   Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
 985   Universe::_out_of_memory_error_gc_overhead_limit =
 986     ik->allocate_instance(CHECK_false);
 987   Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
 988   Universe::_out_of_memory_error_retry = ik->allocate_instance(CHECK_false);
 989 
 990   // Setup preallocated cause message for delayed StackOverflowError
 991   if (StackReservedPages > 0) {
 992     Universe::_delayed_stack_overflow_error_message =
 993       java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
 994   }
 995 
 996   // Setup preallocated NullPointerException
 997   // (this is currently used for a cheap & dirty solution in compiler exception handling)
 998   k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
 999   Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1000   // Setup preallocated ArithmeticException
1001   // (this is currently used for a cheap & dirty solution in compiler exception handling)
1002   k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1003   Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1004   // Virtual Machine Error for when we get into a situation we can't resolve
1005   k = SystemDictionary::resolve_or_fail(
1006     vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1007   bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1008   if (!linked) {
1009      tty->print_cr("Unable to link/verify VirtualMachineError class");
1010      return false; // initialization failed
1011   }
1012   Universe::_virtual_machine_error_instance =
1013     InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1014 
1015   Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1016 
1017   Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1018   java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1019 
1020   msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1021   java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1022   msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1023   java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1024 
1025   msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1026   java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1027 
1028   msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1029   java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1030 
1031   msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1032   java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1033 
1034   msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK_false);
1035   java_lang_Throwable::set_message(Universe::_out_of_memory_error_retry, msg());
1036 
1037   msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1038   java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1039 
1040   // Setup the array of errors that have preallocated backtrace
1041   k = Universe::_out_of_memory_error_java_heap->klass();
1042   assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1043   ik = InstanceKlass::cast(k);
1044 
1045   int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1046   Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1047   for (int i=0; i<len; i++) {
1048     oop err = ik->allocate_instance(CHECK_false);
1049     Handle err_h = Handle(THREAD, err);
1050     java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1051     Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1052   }
1053   Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1054 
1055   Universe::initialize_known_methods(CHECK_false);
1056 
1057   // This needs to be done before the first scavenge/gc, since
1058   // it's an input to soft ref clearing policy.
1059   {
1060     MutexLocker x(Heap_lock);
1061     Universe::update_heap_info_at_gc();
1062   }
1063 
1064   // ("weak") refs processing infrastructure initialization
1065   Universe::heap()->post_initialize();
1066 
1067   MemoryService::add_metaspace_memory_pools();
1068 
1069   MemoryService::set_universe_heap(Universe::heap());
1070 #if INCLUDE_CDS
1071   MetaspaceShared::post_initialize(CHECK_false);
1072 #endif
1073   return true;
1074 }
1075 
1076 
1077 void Universe::compute_base_vtable_size() {
1078   _base_vtable_size = ClassLoader::compute_Object_vtable();
1079 }
1080 
1081 void Universe::print_on(outputStream* st) {
1082   GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1083   st->print_cr("Heap");
1084   heap()->print_on(st);
1085 }
1086 
1087 void Universe::print_heap_at_SIGBREAK() {
1088   if (PrintHeapAtSIGBREAK) {
1089     print_on(tty);
1090     tty->cr();
1091     tty->flush();
1092   }
1093 }
1094 
1095 void Universe::print_heap_before_gc() {
1096   LogTarget(Debug, gc, heap) lt;
1097   if (lt.is_enabled()) {
1098     LogStream ls(lt);
1099     ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1100     ResourceMark rm;
1101     heap()->print_on(&ls);
1102   }
1103 }
1104 
1105 void Universe::print_heap_after_gc() {
1106   LogTarget(Debug, gc, heap) lt;
1107   if (lt.is_enabled()) {
1108     LogStream ls(lt);
1109     ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1110     ResourceMark rm;
1111     heap()->print_on(&ls);
1112   }
1113 }
1114 
1115 void Universe::initialize_verify_flags() {
1116   verify_flags = 0;
1117   const char delimiter[] = " ,";
1118 
1119   size_t length = strlen(VerifySubSet);
1120   char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1121   strncpy(subset_list, VerifySubSet, length + 1);
1122 
1123   char* token = strtok(subset_list, delimiter);
1124   while (token != NULL) {
1125     if (strcmp(token, "threads") == 0) {
1126       verify_flags |= Verify_Threads;
1127     } else if (strcmp(token, "heap") == 0) {
1128       verify_flags |= Verify_Heap;
1129     } else if (strcmp(token, "symbol_table") == 0) {
1130       verify_flags |= Verify_SymbolTable;
1131     } else if (strcmp(token, "string_table") == 0) {
1132       verify_flags |= Verify_StringTable;
1133     } else if (strcmp(token, "codecache") == 0) {
1134       verify_flags |= Verify_CodeCache;
1135     } else if (strcmp(token, "dictionary") == 0) {
1136       verify_flags |= Verify_SystemDictionary;
1137     } else if (strcmp(token, "classloader_data_graph") == 0) {
1138       verify_flags |= Verify_ClassLoaderDataGraph;
1139     } else if (strcmp(token, "metaspace") == 0) {
1140       verify_flags |= Verify_MetaspaceUtils;
1141     } else if (strcmp(token, "jni_handles") == 0) {
1142       verify_flags |= Verify_JNIHandles;
1143     } else if (strcmp(token, "codecache_oops") == 0) {
1144       verify_flags |= Verify_CodeCacheOops;
1145     } else {
1146       vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1147     }
1148     token = strtok(NULL, delimiter);
1149   }
1150   FREE_C_HEAP_ARRAY(char, subset_list);
1151 }
1152 
1153 bool Universe::should_verify_subset(uint subset) {
1154   if (verify_flags & subset) {
1155     return true;
1156   }
1157   return false;
1158 }
1159 
1160 void Universe::verify(VerifyOption option, const char* prefix) {
1161   // The use of _verify_in_progress is a temporary work around for
1162   // 6320749.  Don't bother with a creating a class to set and clear
1163   // it since it is only used in this method and the control flow is
1164   // straight forward.
1165   _verify_in_progress = true;
1166 
1167   COMPILER2_PRESENT(
1168     assert(!DerivedPointerTable::is_active(),
1169          "DPT should not be active during verification "
1170          "(of thread stacks below)");
1171   )
1172 
1173   ResourceMark rm;
1174   HandleMark hm;  // Handles created during verification can be zapped
1175   _verify_count++;
1176 
1177   FormatBuffer<> title("Verifying %s", prefix);
1178   GCTraceTime(Info, gc, verify) tm(title.buffer());
1179   if (should_verify_subset(Verify_Threads)) {
1180     log_debug(gc, verify)("Threads");
1181     Threads::verify();
1182   }
1183   if (should_verify_subset(Verify_Heap)) {
1184     log_debug(gc, verify)("Heap");
1185     heap()->verify(option);
1186   }
1187   if (should_verify_subset(Verify_SymbolTable)) {
1188     log_debug(gc, verify)("SymbolTable");
1189     SymbolTable::verify();
1190   }
1191   if (should_verify_subset(Verify_StringTable)) {
1192     log_debug(gc, verify)("StringTable");
1193     StringTable::verify();
1194   }
1195   if (should_verify_subset(Verify_CodeCache)) {
1196   {
1197     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1198     log_debug(gc, verify)("CodeCache");
1199     CodeCache::verify();
1200   }
1201   }
1202   if (should_verify_subset(Verify_SystemDictionary)) {
1203     log_debug(gc, verify)("SystemDictionary");
1204     SystemDictionary::verify();
1205   }
1206 #ifndef PRODUCT
1207   if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1208     log_debug(gc, verify)("ClassLoaderDataGraph");
1209     ClassLoaderDataGraph::verify();
1210   }
1211 #endif
1212   if (should_verify_subset(Verify_MetaspaceUtils)) {
1213     log_debug(gc, verify)("MetaspaceUtils");
1214     MetaspaceUtils::verify_free_chunks();
1215   }
1216   if (should_verify_subset(Verify_JNIHandles)) {
1217     log_debug(gc, verify)("JNIHandles");
1218     JNIHandles::verify();
1219   }
1220   if (should_verify_subset(Verify_CodeCacheOops)) {
1221     log_debug(gc, verify)("CodeCache Oops");
1222     CodeCache::verify_oops();
1223   }
1224 
1225   _verify_in_progress = false;
1226 }
1227 
1228 
1229 #ifndef PRODUCT
1230 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1231   assert(low_boundary < high_boundary, "bad interval");
1232 
1233   // decide which low-order bits we require to be clear:
1234   size_t alignSize = MinObjAlignmentInBytes;
1235   size_t min_object_size = CollectedHeap::min_fill_size();
1236 
1237   // make an inclusive limit:
1238   uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1239   uintptr_t min = (uintptr_t)low_boundary;
1240   assert(min < max, "bad interval");
1241   uintptr_t diff = max ^ min;
1242 
1243   // throw away enough low-order bits to make the diff vanish
1244   uintptr_t mask = (uintptr_t)(-1);
1245   while ((mask & diff) != 0)
1246     mask <<= 1;
1247   uintptr_t bits = (min & mask);
1248   assert(bits == (max & mask), "correct mask");
1249   // check an intermediate value between min and max, just to make sure:
1250   assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1251 
1252   // require address alignment, too:
1253   mask |= (alignSize - 1);
1254 
1255   if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1256     assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1257   }
1258   _verify_oop_mask = mask;
1259   _verify_oop_bits = bits;
1260 }
1261 
1262 // Oop verification (see MacroAssembler::verify_oop)
1263 
1264 uintptr_t Universe::verify_oop_mask() {
1265   MemRegion m = heap()->reserved_region();
1266   calculate_verify_data(m.start(), m.end());
1267   return _verify_oop_mask;
1268 }
1269 
1270 uintptr_t Universe::verify_oop_bits() {
1271   MemRegion m = heap()->reserved_region();
1272   calculate_verify_data(m.start(), m.end());
1273   return _verify_oop_bits;
1274 }
1275 
1276 uintptr_t Universe::verify_mark_mask() {
1277   return markOopDesc::lock_mask_in_place;
1278 }
1279 
1280 uintptr_t Universe::verify_mark_bits() {
1281   intptr_t mask = verify_mark_mask();
1282   intptr_t bits = (intptr_t)markOopDesc::prototype();
1283   assert((bits & ~mask) == 0, "no stray header bits");
1284   return bits;
1285 }
1286 #endif // PRODUCT
1287 
1288 
1289 void Universe::compute_verify_oop_data() {
1290   verify_oop_mask();
1291   verify_oop_bits();
1292   verify_mark_mask();
1293   verify_mark_bits();
1294 }
1295 
1296 
1297 void LatestMethodCache::init(Klass* k, Method* m) {
1298   if (!UseSharedSpaces) {
1299     _klass = k;
1300   }
1301 #ifndef PRODUCT
1302   else {
1303     // sharing initilization should have already set up _klass
1304     assert(_klass != NULL, "just checking");
1305   }
1306 #endif
1307 
1308   _method_idnum = m->method_idnum();
1309   assert(_method_idnum >= 0, "sanity check");
1310 }
1311 
1312 
1313 Method* LatestMethodCache::get_method() {
1314   if (klass() == NULL) return NULL;
1315   InstanceKlass* ik = InstanceKlass::cast(klass());
1316   Method* m = ik->method_with_idnum(method_idnum());
1317   assert(m != NULL, "sanity check");
1318   return m;
1319 }
1320 
1321 
1322 #ifdef ASSERT
1323 // Release dummy object(s) at bottom of heap
1324 bool Universe::release_fullgc_alot_dummy() {
1325   MutexLocker ml(FullGCALot_lock);
1326   if (_fullgc_alot_dummy_array != NULL) {
1327     if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1328       // No more dummies to release, release entire array instead
1329       _fullgc_alot_dummy_array = NULL;
1330       return false;
1331     }
1332     if (!UseConcMarkSweepGC) {
1333       // Release dummy at bottom of old generation
1334       _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1335     }
1336     // Release dummy at bottom of permanent generation
1337     _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1338   }
1339   return true;
1340 }
1341 
1342 #endif // ASSERT
--- EOF ---