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











1346 
1347 #ifdef ASSERT
1348 // Release dummy object(s) at bottom of heap
1349 bool Universe::release_fullgc_alot_dummy() {
1350   MutexLocker ml(FullGCALot_lock);
1351   if (_fullgc_alot_dummy_array != NULL) {
1352     if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1353       // No more dummies to release, release entire array instead
1354       _fullgc_alot_dummy_array = NULL;
1355       return false;
1356     }
1357     if (!UseConcMarkSweepGC) {
1358       // Release dummy at bottom of old generation
1359       _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1360     }
1361     // Release dummy at bottom of permanent generation
1362     _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1363   }
1364   return true;
1365 }
1366 
1367 #endif // ASSERT
--- EOF ---