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::_throw_illegal_access_error_cache = NULL;
 109 LatestMethodCache* Universe::_do_stack_walk_cache     = NULL;
 110 oop Universe::_out_of_memory_error_java_heap          = NULL;
 111 oop Universe::_out_of_memory_error_metaspace          = NULL;
 112 oop Universe::_out_of_memory_error_class_metaspace    = NULL;
 113 oop Universe::_out_of_memory_error_array_size         = NULL;
 114 oop Universe::_out_of_memory_error_gc_overhead_limit  = NULL;
 115 oop Universe::_out_of_memory_error_realloc_objects    = NULL;
 116 oop Universe::_out_of_memory_error_retry              = NULL;
 117 oop Universe::_delayed_stack_overflow_error_message   = NULL;
 118 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
 119 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
 120 bool Universe::_verify_in_progress                    = false;
 121 long Universe::verify_flags                           = Universe::Verify_All;
 122 oop Universe::_null_ptr_exception_instance            = NULL;
 123 oop Universe::_arithmetic_exception_instance          = NULL;
 124 oop Universe::_virtual_machine_error_instance         = NULL;
 125 oop Universe::_vm_exception                           = NULL;
 126 oop Universe::_reference_pending_list                 = NULL;
 127 
 128 Array<int>* Universe::_the_empty_int_array            = NULL;
 129 Array<u2>* Universe::_the_empty_short_array           = NULL;
 130 Array<Klass*>* Universe::_the_empty_klass_array     = NULL;
 131 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array  = NULL;
 132 Array<Method*>* Universe::_the_empty_method_array   = NULL;
 133 
 134 // These variables are guarded by FullGCALot_lock.
 135 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
 136 debug_only(int Universe::_fullgc_alot_dummy_next      = 0;)
 137 
 138 // Heap
 139 int             Universe::_verify_count = 0;
 140 
 141 // Oop verification (see MacroAssembler::verify_oop)
 142 uintptr_t       Universe::_verify_oop_mask = 0;
 143 uintptr_t       Universe::_verify_oop_bits = (uintptr_t) -1;
 144 
 145 int             Universe::_base_vtable_size = 0;
 146 bool            Universe::_bootstrapping = false;
 147 bool            Universe::_module_initialized = false;
 148 bool            Universe::_fully_initialized = false;
 149 
 150 size_t          Universe::_heap_capacity_at_last_gc;
 151 size_t          Universe::_heap_used_at_last_gc = 0;
 152 
 153 CollectedHeap*  Universe::_collectedHeap = NULL;
 154 
 155 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
 156 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
 157 address Universe::_narrow_ptrs_base;
 158 uint64_t Universe::_narrow_klass_range = (uint64_t(max_juint)+1);
 159 
 160 void Universe::basic_type_classes_do(void f(Klass*)) {
 161   for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
 162     f(_typeArrayKlassObjs[i]);
 163   }
 164 }
 165 
 166 void Universe::basic_type_classes_do(KlassClosure *closure) {
 167   for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
 168     closure->do_klass(_typeArrayKlassObjs[i]);
 169   }
 170 }
 171 
 172 void Universe::oops_do(OopClosure* f) {
 173 
 174   f->do_oop((oop*) &_int_mirror);
 175   f->do_oop((oop*) &_float_mirror);
 176   f->do_oop((oop*) &_double_mirror);
 177   f->do_oop((oop*) &_byte_mirror);
 178   f->do_oop((oop*) &_bool_mirror);
 179   f->do_oop((oop*) &_char_mirror);
 180   f->do_oop((oop*) &_long_mirror);
 181   f->do_oop((oop*) &_short_mirror);
 182   f->do_oop((oop*) &_void_mirror);
 183 
 184   for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
 185     f->do_oop((oop*) &_mirrors[i]);
 186   }
 187   assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
 188 
 189   f->do_oop((oop*)&_the_empty_class_klass_array);
 190   f->do_oop((oop*)&_the_null_sentinel);
 191   f->do_oop((oop*)&_the_null_string);
 192   f->do_oop((oop*)&_the_min_jint_string);
 193   f->do_oop((oop*)&_out_of_memory_error_java_heap);
 194   f->do_oop((oop*)&_out_of_memory_error_metaspace);
 195   f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
 196   f->do_oop((oop*)&_out_of_memory_error_array_size);
 197   f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
 198   f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
 199   f->do_oop((oop*)&_out_of_memory_error_retry);
 200   f->do_oop((oop*)&_delayed_stack_overflow_error_message);
 201   f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
 202   f->do_oop((oop*)&_null_ptr_exception_instance);
 203   f->do_oop((oop*)&_arithmetic_exception_instance);
 204   f->do_oop((oop*)&_virtual_machine_error_instance);
 205   f->do_oop((oop*)&_main_thread_group);
 206   f->do_oop((oop*)&_system_thread_group);
 207   f->do_oop((oop*)&_vm_exception);
 208   f->do_oop((oop*)&_reference_pending_list);
 209   debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
 210 }
 211 
 212 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
 213   it->push(&_klass);
 214 }
 215 
 216 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
 217   for (int i = 0; i < T_LONG+1; i++) {
 218     it->push(&_typeArrayKlassObjs[i]);
 219   }
 220   it->push(&_objectArrayKlassObj);
 221 
 222   it->push(&_the_empty_int_array);
 223   it->push(&_the_empty_short_array);
 224   it->push(&_the_empty_klass_array);
 225   it->push(&_the_empty_instance_klass_array);
 226   it->push(&_the_empty_method_array);
 227   it->push(&_the_array_interfaces_array);
 228 
 229   _finalizer_register_cache->metaspace_pointers_do(it);
 230   _loader_addClass_cache->metaspace_pointers_do(it);

 231   _throw_illegal_access_error_cache->metaspace_pointers_do(it);
 232   _do_stack_walk_cache->metaspace_pointers_do(it);
 233 }
 234 
 235 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
 236 void Universe::serialize(SerializeClosure* f) {
 237 
 238   for (int i = 0; i < T_LONG+1; i++) {
 239     f->do_ptr((void**)&_typeArrayKlassObjs[i]);
 240   }
 241 
 242   f->do_ptr((void**)&_objectArrayKlassObj);
 243 #if INCLUDE_CDS_JAVA_HEAP
 244 #ifdef ASSERT
 245   if (DumpSharedSpaces && !HeapShared::is_heap_object_archiving_allowed()) {
 246     assert(_int_mirror == NULL    && _float_mirror == NULL &&
 247            _double_mirror == NULL && _byte_mirror == NULL  &&
 248            _bool_mirror == NULL   && _char_mirror == NULL  &&
 249            _long_mirror == NULL   && _short_mirror == NULL &&
 250            _void_mirror == NULL, "mirrors should be NULL");
 251   }
 252 #endif
 253   f->do_oop(&_int_mirror);
 254   f->do_oop(&_float_mirror);
 255   f->do_oop(&_double_mirror);
 256   f->do_oop(&_byte_mirror);
 257   f->do_oop(&_bool_mirror);
 258   f->do_oop(&_char_mirror);
 259   f->do_oop(&_long_mirror);
 260   f->do_oop(&_short_mirror);
 261   f->do_oop(&_void_mirror);
 262 #endif
 263 
 264   f->do_ptr((void**)&_the_array_interfaces_array);
 265   f->do_ptr((void**)&_the_empty_int_array);
 266   f->do_ptr((void**)&_the_empty_short_array);
 267   f->do_ptr((void**)&_the_empty_method_array);
 268   f->do_ptr((void**)&_the_empty_klass_array);
 269   f->do_ptr((void**)&_the_empty_instance_klass_array);
 270   _finalizer_register_cache->serialize(f);
 271   _loader_addClass_cache->serialize(f);

 272   _throw_illegal_access_error_cache->serialize(f);
 273   _do_stack_walk_cache->serialize(f);
 274 }
 275 
 276 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
 277   if (size < alignment || size % alignment != 0) {
 278     vm_exit_during_initialization(
 279       err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
 280   }
 281 }
 282 
 283 void initialize_basic_type_klass(Klass* k, TRAPS) {
 284   Klass* ok = SystemDictionary::Object_klass();
 285 #if INCLUDE_CDS
 286   if (UseSharedSpaces) {
 287     ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
 288     assert(k->super() == ok, "u3");
 289     k->restore_unshareable_info(loader_data, Handle(), CHECK);
 290   } else
 291 #endif
 292   {
 293     k->initialize_supers(ok, NULL, CHECK);
 294   }
 295   k->append_to_sibling_list();
 296 }
 297 
 298 void Universe::genesis(TRAPS) {
 299   ResourceMark rm;
 300 
 301   { FlagSetting fs(_bootstrapping, true);
 302 
 303     { MutexLocker mc(Compile_lock);
 304 
 305       java_lang_Class::allocate_fixup_lists();
 306 
 307       // determine base vtable size; without that we cannot create the array klasses
 308       compute_base_vtable_size();
 309 
 310       if (!UseSharedSpaces) {
 311         for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
 312           _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
 313         }
 314 
 315         ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
 316 
 317         _the_array_interfaces_array     = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
 318         _the_empty_int_array            = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
 319         _the_empty_short_array          = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
 320         _the_empty_method_array         = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
 321         _the_empty_klass_array          = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
 322         _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
 323       }
 324     }
 325 
 326     vmSymbols::initialize(CHECK);
 327 
 328     SystemDictionary::initialize(CHECK);
 329 
 330     Klass* ok = SystemDictionary::Object_klass();
 331 
 332     _the_null_string            = StringTable::intern("null", CHECK);
 333     _the_min_jint_string       = StringTable::intern("-2147483648", CHECK);
 334 
 335 #if INCLUDE_CDS
 336     if (UseSharedSpaces) {
 337       // Verify shared interfaces array.
 338       assert(_the_array_interfaces_array->at(0) ==
 339              SystemDictionary::Cloneable_klass(), "u3");
 340       assert(_the_array_interfaces_array->at(1) ==
 341              SystemDictionary::Serializable_klass(), "u3");
 342     } else
 343 #endif
 344     {
 345       // Set up shared interfaces array.  (Do this before supers are set up.)
 346       _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
 347       _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
 348     }
 349 
 350     initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
 351     initialize_basic_type_klass(charArrayKlassObj(), CHECK);
 352     initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
 353     initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
 354     initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
 355     initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
 356     initialize_basic_type_klass(intArrayKlassObj(), CHECK);
 357     initialize_basic_type_klass(longArrayKlassObj(), CHECK);
 358   } // end of core bootstrapping
 359 
 360   {
 361     Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
 362     _the_null_sentinel = tns();
 363   }
 364 
 365   // Maybe this could be lifted up now that object array can be initialized
 366   // during the bootstrapping.
 367 
 368   // OLD
 369   // Initialize _objectArrayKlass after core bootstraping to make
 370   // sure the super class is set up properly for _objectArrayKlass.
 371   // ---
 372   // NEW
 373   // Since some of the old system object arrays have been converted to
 374   // ordinary object arrays, _objectArrayKlass will be loaded when
 375   // SystemDictionary::initialize(CHECK); is run. See the extra check
 376   // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
 377   _objectArrayKlassObj = InstanceKlass::
 378     cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
 379   // OLD
 380   // Add the class to the class hierarchy manually to make sure that
 381   // its vtable is initialized after core bootstrapping is completed.
 382   // ---
 383   // New
 384   // Have already been initialized.
 385   _objectArrayKlassObj->append_to_sibling_list();
 386 
 387   #ifdef ASSERT
 388   if (FullGCALot) {
 389     // Allocate an array of dummy objects.
 390     // We'd like these to be at the bottom of the old generation,
 391     // so that when we free one and then collect,
 392     // (almost) the whole heap moves
 393     // and we find out if we actually update all the oops correctly.
 394     // But we can't allocate directly in the old generation,
 395     // so we allocate wherever, and hope that the first collection
 396     // moves these objects to the bottom of the old generation.
 397     // We can allocate directly in the permanent generation, so we do.
 398     int size;
 399     if (UseConcMarkSweepGC) {
 400       log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
 401       size = FullGCALotDummies;
 402     } else {
 403       size = FullGCALotDummies * 2;
 404     }
 405     objArrayOop    naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
 406     objArrayHandle dummy_array(THREAD, naked_array);
 407     int i = 0;
 408     while (i < size) {
 409         // Allocate dummy in old generation
 410       oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
 411       dummy_array->obj_at_put(i++, dummy);
 412     }
 413     {
 414       // Only modify the global variable inside the mutex.
 415       // If we had a race to here, the other dummy_array instances
 416       // and their elements just get dropped on the floor, which is fine.
 417       MutexLocker ml(FullGCALot_lock);
 418       if (_fullgc_alot_dummy_array == NULL) {
 419         _fullgc_alot_dummy_array = dummy_array();
 420       }
 421     }
 422     assert(i == _fullgc_alot_dummy_array->length(), "just checking");
 423   }
 424   #endif
 425 }
 426 
 427 void Universe::initialize_basic_type_mirrors(TRAPS) {
 428 #if INCLUDE_CDS_JAVA_HEAP
 429     if (UseSharedSpaces &&
 430         HeapShared::open_archive_heap_region_mapped() &&
 431         _int_mirror != NULL) {
 432       assert(HeapShared::is_heap_object_archiving_allowed(), "Sanity");
 433       assert(_float_mirror != NULL && _double_mirror != NULL &&
 434              _byte_mirror  != NULL && _byte_mirror   != NULL &&
 435              _bool_mirror  != NULL && _char_mirror   != NULL &&
 436              _long_mirror  != NULL && _short_mirror  != NULL &&
 437              _void_mirror  != NULL, "Sanity");
 438     } else
 439 #endif
 440     {
 441       _int_mirror     =
 442         java_lang_Class::create_basic_type_mirror("int",    T_INT, CHECK);
 443       _float_mirror   =
 444         java_lang_Class::create_basic_type_mirror("float",  T_FLOAT,   CHECK);
 445       _double_mirror  =
 446         java_lang_Class::create_basic_type_mirror("double", T_DOUBLE,  CHECK);
 447       _byte_mirror    =
 448         java_lang_Class::create_basic_type_mirror("byte",   T_BYTE, CHECK);
 449       _bool_mirror    =
 450         java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
 451       _char_mirror    =
 452         java_lang_Class::create_basic_type_mirror("char",   T_CHAR, CHECK);
 453       _long_mirror    =
 454         java_lang_Class::create_basic_type_mirror("long",   T_LONG, CHECK);
 455       _short_mirror   =
 456         java_lang_Class::create_basic_type_mirror("short",  T_SHORT,   CHECK);
 457       _void_mirror    =
 458         java_lang_Class::create_basic_type_mirror("void",   T_VOID, CHECK);
 459     }
 460 
 461     _mirrors[T_INT]     = _int_mirror;
 462     _mirrors[T_FLOAT]   = _float_mirror;
 463     _mirrors[T_DOUBLE]  = _double_mirror;
 464     _mirrors[T_BYTE]    = _byte_mirror;
 465     _mirrors[T_BOOLEAN] = _bool_mirror;
 466     _mirrors[T_CHAR]    = _char_mirror;
 467     _mirrors[T_LONG]    = _long_mirror;
 468     _mirrors[T_SHORT]   = _short_mirror;
 469     _mirrors[T_VOID]    = _void_mirror;
 470   //_mirrors[T_OBJECT]  = _object_klass->java_mirror();
 471   //_mirrors[T_ARRAY]   = _object_klass->java_mirror();
 472 }
 473 
 474 void Universe::fixup_mirrors(TRAPS) {
 475   // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
 476   // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
 477   // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
 478   // that the number of objects allocated at this point is very small.
 479   assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
 480   HandleMark hm(THREAD);
 481 
 482   if (!UseSharedSpaces) {
 483     // Cache the start of the static fields
 484     InstanceMirrorKlass::init_offset_of_static_fields();
 485   }
 486 
 487   GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
 488   int list_length = list->length();
 489   for (int i = 0; i < list_length; i++) {
 490     Klass* k = list->at(i);
 491     assert(k->is_klass(), "List should only hold classes");
 492     EXCEPTION_MARK;
 493     java_lang_Class::fixup_mirror(k, CATCH);
 494   }
 495   delete java_lang_Class::fixup_mirror_list();
 496   java_lang_Class::set_fixup_mirror_list(NULL);
 497 }
 498 
 499 #define assert_pll_locked(test) \
 500   assert(Heap_lock->test(), "Reference pending list access requires lock")
 501 
 502 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
 503 
 504 oop Universe::reference_pending_list() {
 505   if (Thread::current()->is_VM_thread()) {
 506     assert_pll_locked(is_locked);
 507   } else {
 508     assert_pll_ownership();
 509   }
 510   return _reference_pending_list;
 511 }
 512 
 513 void Universe::set_reference_pending_list(oop list) {
 514   assert_pll_ownership();
 515   _reference_pending_list = list;
 516 }
 517 
 518 bool Universe::has_reference_pending_list() {
 519   assert_pll_ownership();
 520   return _reference_pending_list != NULL;
 521 }
 522 
 523 oop Universe::swap_reference_pending_list(oop list) {
 524   assert_pll_locked(is_locked);
 525   return Atomic::xchg(list, &_reference_pending_list);
 526 }
 527 
 528 #undef assert_pll_locked
 529 #undef assert_pll_ownership
 530 
 531 // initialize_vtable could cause gc if
 532 // 1) we specified true to initialize_vtable and
 533 // 2) this ran after gc was enabled
 534 // In case those ever change we use handles for oops
 535 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
 536   // init vtable of k and all subclasses
 537   ko->vtable().initialize_vtable(false, CHECK);
 538   if (ko->is_instance_klass()) {
 539     for (Klass* sk = ko->subklass();
 540          sk != NULL;
 541          sk = sk->next_sibling()) {
 542       reinitialize_vtable_of(sk, CHECK);
 543     }
 544   }
 545 }
 546 
 547 
 548 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
 549   k->itable().initialize_itable(false, CHECK);
 550 }
 551 
 552 
 553 void Universe::reinitialize_itables(TRAPS) {
 554   MutexLocker mcld(ClassLoaderDataGraph_lock);
 555   ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
 556 }
 557 
 558 
 559 bool Universe::on_page_boundary(void* addr) {
 560   return is_aligned(addr, os::vm_page_size());
 561 }
 562 
 563 
 564 bool Universe::should_fill_in_stack_trace(Handle throwable) {
 565   // never attempt to fill in the stack trace of preallocated errors that do not have
 566   // backtrace. These errors are kept alive forever and may be "re-used" when all
 567   // preallocated errors with backtrace have been consumed. Also need to avoid
 568   // a potential loop which could happen if an out of memory occurs when attempting
 569   // to allocate the backtrace.
 570   return ((!oopDesc::equals(throwable(), Universe::_out_of_memory_error_java_heap)) &&
 571           (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_metaspace))  &&
 572           (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_class_metaspace))  &&
 573           (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_array_size)) &&
 574           (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_gc_overhead_limit)) &&
 575           (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_realloc_objects)) &&
 576           (!oopDesc::equals(throwable(), Universe::_out_of_memory_error_retry)));
 577 }
 578 
 579 
 580 oop Universe::gen_out_of_memory_error(oop default_err) {
 581   // generate an out of memory error:
 582   // - if there is a preallocated error and stack traces are available
 583   //   (j.l.Throwable is initialized), then return the preallocated
 584   //   error with a filled in stack trace, and with the message
 585   //   provided by the default error.
 586   // - otherwise, return the default error, without a stack trace.
 587   int next;
 588   if ((_preallocated_out_of_memory_error_avail_count > 0) &&
 589       SystemDictionary::Throwable_klass()->is_initialized()) {
 590     next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
 591     assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
 592   } else {
 593     next = -1;
 594   }
 595   if (next < 0) {
 596     // all preallocated errors have been used.
 597     // return default
 598     return default_err;
 599   } else {
 600     Thread* THREAD = Thread::current();
 601     Handle default_err_h(THREAD, default_err);
 602     // get the error object at the slot and set set it to NULL so that the
 603     // array isn't keeping it alive anymore.
 604     Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
 605     assert(exc() != NULL, "slot has been used already");
 606     preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
 607 
 608     // use the message from the default error
 609     oop msg = java_lang_Throwable::message(default_err_h());
 610     assert(msg != NULL, "no message");
 611     java_lang_Throwable::set_message(exc(), msg);
 612 
 613     // populate the stack trace and return it.
 614     java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
 615     return exc();
 616   }
 617 }
 618 
 619 intptr_t Universe::_non_oop_bits = 0;
 620 
 621 void* Universe::non_oop_word() {
 622   // Neither the high bits nor the low bits of this value is allowed
 623   // to look like (respectively) the high or low bits of a real oop.
 624   //
 625   // High and low are CPU-specific notions, but low always includes
 626   // the low-order bit.  Since oops are always aligned at least mod 4,
 627   // setting the low-order bit will ensure that the low half of the
 628   // word will never look like that of a real oop.
 629   //
 630   // Using the OS-supplied non-memory-address word (usually 0 or -1)
 631   // will take care of the high bits, however many there are.
 632 
 633   if (_non_oop_bits == 0) {
 634     _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
 635   }
 636 
 637   return (void*)_non_oop_bits;
 638 }
 639 
 640 jint universe_init() {
 641   assert(!Universe::_fully_initialized, "called after initialize_vtables");
 642   guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
 643          "LogHeapWordSize is incorrect.");
 644   guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
 645   guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
 646             "oop size is not not a multiple of HeapWord size");
 647 
 648   TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
 649 
 650   JavaClasses::compute_hard_coded_offsets();
 651 
 652   jint status = Universe::initialize_heap();
 653   if (status != JNI_OK) {
 654     return status;
 655   }
 656 
 657   SystemDictionary::initialize_oop_storage();
 658 
 659   Metaspace::global_initialize();
 660 
 661   // Initialize performance counters for metaspaces
 662   MetaspaceCounters::initialize_performance_counters();
 663   CompressedClassSpaceCounters::initialize_performance_counters();
 664 
 665   AOTLoader::universe_init();
 666 
 667   // Checks 'AfterMemoryInit' constraints.
 668   if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) {
 669     return JNI_EINVAL;
 670   }
 671 
 672   // Create memory for metadata.  Must be after initializing heap for
 673   // DumpSharedSpaces.
 674   ClassLoaderData::init_null_class_loader_data();
 675 
 676   // We have a heap so create the Method* caches before
 677   // Metaspace::initialize_shared_spaces() tries to populate them.
 678   Universe::_finalizer_register_cache = new LatestMethodCache();
 679   Universe::_loader_addClass_cache    = new LatestMethodCache();

 680   Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
 681   Universe::_do_stack_walk_cache = new LatestMethodCache();
 682 
 683 #if INCLUDE_CDS
 684   if (UseSharedSpaces) {
 685     // Read the data structures supporting the shared spaces (shared
 686     // system dictionary, symbol table, etc.).  After that, access to
 687     // the file (other than the mapped regions) is no longer needed, and
 688     // the file is closed. Closing the file does not affect the
 689     // currently mapped regions.
 690     MetaspaceShared::initialize_shared_spaces();
 691     StringTable::create_table();
 692   } else
 693 #endif
 694   {
 695     SymbolTable::create_table();
 696     StringTable::create_table();
 697 
 698 #if INCLUDE_CDS
 699     if (DumpSharedSpaces) {
 700       MetaspaceShared::prepare_for_dumping();
 701     }
 702 #endif
 703   }
 704   if (strlen(VerifySubSet) > 0) {
 705     Universe::initialize_verify_flags();
 706   }
 707 
 708   ResolvedMethodTable::create_table();
 709 
 710   return JNI_OK;
 711 }
 712 
 713 CollectedHeap* Universe::create_heap() {
 714   assert(_collectedHeap == NULL, "Heap already created");
 715   return GCConfig::arguments()->create_heap();
 716 }
 717 
 718 // Choose the heap base address and oop encoding mode
 719 // when compressed oops are used:
 720 // Unscaled  - Use 32-bits oops without encoding when
 721 //     NarrowOopHeapBaseMin + heap_size < 4Gb
 722 // ZeroBased - Use zero based compressed oops with encoding when
 723 //     NarrowOopHeapBaseMin + heap_size < 32Gb
 724 // HeapBased - Use compressed oops with heap base + encoding.
 725 
 726 jint Universe::initialize_heap() {
 727   _collectedHeap = create_heap();
 728   jint status = _collectedHeap->initialize();
 729   if (status != JNI_OK) {
 730     return status;
 731   }
 732   log_info(gc)("Using %s", _collectedHeap->name());
 733 
 734   ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
 735 
 736 #ifdef _LP64
 737   if (UseCompressedOops) {
 738     // Subtract a page because something can get allocated at heap base.
 739     // This also makes implicit null checking work, because the
 740     // memory+1 page below heap_base needs to cause a signal.
 741     // See needs_explicit_null_check.
 742     // Only set the heap base for compressed oops because it indicates
 743     // compressed oops for pstack code.
 744     if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
 745       // Didn't reserve heap below 4Gb.  Must shift.
 746       Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
 747     }
 748     if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
 749       // Did reserve heap below 32Gb. Can use base == 0;
 750       Universe::set_narrow_oop_base(0);
 751     }
 752     AOTLoader::set_narrow_oop_shift();
 753 
 754     Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
 755 
 756     LogTarget(Info, gc, heap, coops) lt;
 757     if (lt.is_enabled()) {
 758       ResourceMark rm;
 759       LogStream ls(lt);
 760       Universe::print_compressed_oops_mode(&ls);
 761     }
 762 
 763     // Tell tests in which mode we run.
 764     Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
 765                                                    narrow_oop_mode_to_string(narrow_oop_mode()),
 766                                                    false));
 767   }
 768   // Universe::narrow_oop_base() is one page below the heap.
 769   assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
 770          os::vm_page_size()) ||
 771          Universe::narrow_oop_base() == NULL, "invalid value");
 772   assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
 773          Universe::narrow_oop_shift() == 0, "invalid value");
 774 #endif
 775 
 776   // We will never reach the CATCH below since Exceptions::_throw will cause
 777   // the VM to exit if an exception is thrown during initialization
 778 
 779   if (UseTLAB) {
 780     assert(Universe::heap()->supports_tlab_allocation(),
 781            "Should support thread-local allocation buffers");
 782     ThreadLocalAllocBuffer::startup_initialization();
 783   }
 784   return JNI_OK;
 785 }
 786 
 787 void Universe::print_compressed_oops_mode(outputStream* st) {
 788   st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
 789             p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
 790 
 791   st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
 792 
 793   if (Universe::narrow_oop_base() != 0) {
 794     st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
 795   }
 796 
 797   if (Universe::narrow_oop_shift() != 0) {
 798     st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
 799   }
 800 
 801   if (!Universe::narrow_oop_use_implicit_null_checks()) {
 802     st->print(", no protected page in front of the heap");
 803   }
 804   st->cr();
 805 }
 806 
 807 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
 808 
 809   assert(alignment <= Arguments::conservative_max_heap_alignment(),
 810          "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
 811          alignment, Arguments::conservative_max_heap_alignment());
 812 
 813   size_t total_reserved = align_up(heap_size, alignment);
 814   assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
 815       "heap size is too big for compressed oops");
 816 
 817   bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
 818   assert(!UseLargePages
 819       || UseParallelGC
 820       || use_large_pages, "Wrong alignment to use large pages");
 821 
 822   // Now create the space.
 823   ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
 824 
 825   if (total_rs.is_reserved()) {
 826     assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
 827            "must be exactly of required size and alignment");
 828     // We are good.
 829 
 830     if (UseCompressedOops) {
 831       // Universe::initialize_heap() will reset this to NULL if unscaled
 832       // or zero-based narrow oops are actually used.
 833       // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
 834       Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
 835     }
 836 
 837     if (AllocateHeapAt != NULL) {
 838       log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
 839     }
 840     return total_rs;
 841   }
 842 
 843   vm_exit_during_initialization(
 844     err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
 845             total_reserved/K));
 846 
 847   // satisfy compiler
 848   ShouldNotReachHere();
 849   return ReservedHeapSpace(0, 0, false);
 850 }
 851 
 852 
 853 // It's the caller's responsibility to ensure glitch-freedom
 854 // (if required).
 855 void Universe::update_heap_info_at_gc() {
 856   _heap_capacity_at_last_gc = heap()->capacity();
 857   _heap_used_at_last_gc     = heap()->used();
 858 }
 859 
 860 
 861 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
 862   switch (mode) {
 863     case UnscaledNarrowOop:
 864       return "32-bit";
 865     case ZeroBasedNarrowOop:
 866       return "Zero based";
 867     case DisjointBaseNarrowOop:
 868       return "Non-zero disjoint base";
 869     case HeapBasedNarrowOop:
 870       return "Non-zero based";
 871     default:
 872       ShouldNotReachHere();
 873       return "";
 874   }
 875 }
 876 
 877 
 878 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
 879   if (narrow_oop_base_disjoint()) {
 880     return DisjointBaseNarrowOop;
 881   }
 882 
 883   if (narrow_oop_base() != 0) {
 884     return HeapBasedNarrowOop;
 885   }
 886 
 887   if (narrow_oop_shift() != 0) {
 888     return ZeroBasedNarrowOop;
 889   }
 890 
 891   return UnscaledNarrowOop;
 892 }
 893 
 894 void initialize_known_method(LatestMethodCache* method_cache,
 895                              InstanceKlass* ik,
 896                              const char* method,
 897                              Symbol* signature,
 898                              bool is_static, TRAPS)
 899 {
 900   TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
 901   Method* m = NULL;
 902   // The klass must be linked before looking up the method.
 903   if (!ik->link_class_or_fail(THREAD) ||
 904       ((m = ik->find_method(name, signature)) == NULL) ||
 905       is_static != m->is_static()) {
 906     ResourceMark rm(THREAD);
 907     // NoSuchMethodException doesn't actually work because it tries to run the
 908     // <init> function before java_lang_Class is linked. Print error and exit.
 909     vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
 910                                  ik->name()->as_C_string(), method));
 911   }
 912   method_cache->init(ik, m);
 913 }
 914 
 915 void Universe::initialize_known_methods(TRAPS) {
 916   // Set up static method for registering finalizers
 917   initialize_known_method(_finalizer_register_cache,
 918                           SystemDictionary::Finalizer_klass(),
 919                           "register",
 920                           vmSymbols::object_void_signature(), true, CHECK);
 921 
 922   initialize_known_method(_throw_illegal_access_error_cache,
 923                           SystemDictionary::internal_Unsafe_klass(),
 924                           "throwIllegalAccessError",
 925                           vmSymbols::void_method_signature(), true, CHECK);
 926 
 927   // Set up method for registering loaded classes in class loader vector
 928   initialize_known_method(_loader_addClass_cache,
 929                           SystemDictionary::ClassLoader_klass(),
 930                           "addClass",
 931                           vmSymbols::class_void_signature(), false, CHECK);






 932 
 933   // Set up method for stack walking
 934   initialize_known_method(_do_stack_walk_cache,
 935                           SystemDictionary::AbstractStackWalker_klass(),
 936                           "doStackWalk",
 937                           vmSymbols::doStackWalk_signature(), false, CHECK);
 938 }
 939 
 940 void universe2_init() {
 941   EXCEPTION_MARK;
 942   Universe::genesis(CATCH);
 943 }
 944 
 945 // Set after initialization of the module runtime, call_initModuleRuntime
 946 void universe_post_module_init() {
 947   Universe::_module_initialized = true;
 948 }
 949 
 950 bool universe_post_init() {
 951   assert(!is_init_completed(), "Error: initialization not yet completed!");
 952   Universe::_fully_initialized = true;
 953   EXCEPTION_MARK;
 954   { ResourceMark rm;
 955     Interpreter::initialize();      // needed for interpreter entry points
 956     if (!UseSharedSpaces) {
 957       HandleMark hm(THREAD);
 958       Klass* ok = SystemDictionary::Object_klass();
 959       Universe::reinitialize_vtable_of(ok, CHECK_false);
 960       Universe::reinitialize_itables(CHECK_false);
 961     }
 962   }
 963 
 964   HandleMark hm(THREAD);
 965   // Setup preallocated empty java.lang.Class array
 966   Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
 967 
 968   // Setup preallocated OutOfMemoryError errors
 969   Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
 970   InstanceKlass* ik = InstanceKlass::cast(k);
 971   Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
 972   Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
 973   Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
 974   Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
 975   Universe::_out_of_memory_error_gc_overhead_limit =
 976     ik->allocate_instance(CHECK_false);
 977   Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
 978   Universe::_out_of_memory_error_retry = ik->allocate_instance(CHECK_false);
 979 
 980   // Setup preallocated cause message for delayed StackOverflowError
 981   if (StackReservedPages > 0) {
 982     Universe::_delayed_stack_overflow_error_message =
 983       java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
 984   }
 985 
 986   // Setup preallocated NullPointerException
 987   // (this is currently used for a cheap & dirty solution in compiler exception handling)
 988   k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
 989   Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 990   // Setup preallocated ArithmeticException
 991   // (this is currently used for a cheap & dirty solution in compiler exception handling)
 992   k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
 993   Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 994   // Virtual Machine Error for when we get into a situation we can't resolve
 995   k = SystemDictionary::resolve_or_fail(
 996     vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
 997   bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
 998   if (!linked) {
 999      tty->print_cr("Unable to link/verify VirtualMachineError class");
1000      return false; // initialization failed
1001   }
1002   Universe::_virtual_machine_error_instance =
1003     InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1004 
1005   Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1006 
1007   Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1008   java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1009 
1010   msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1011   java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1012   msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1013   java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1014 
1015   msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1016   java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1017 
1018   msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1019   java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1020 
1021   msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
1022   java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
1023 
1024   msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK_false);
1025   java_lang_Throwable::set_message(Universe::_out_of_memory_error_retry, msg());
1026 
1027   msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1028   java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1029 
1030   // Setup the array of errors that have preallocated backtrace
1031   k = Universe::_out_of_memory_error_java_heap->klass();
1032   assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1033   ik = InstanceKlass::cast(k);
1034 
1035   int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1036   Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
1037   for (int i=0; i<len; i++) {
1038     oop err = ik->allocate_instance(CHECK_false);
1039     Handle err_h = Handle(THREAD, err);
1040     java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1041     Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1042   }
1043   Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1044 
1045   Universe::initialize_known_methods(CHECK_false);
1046 
1047   // This needs to be done before the first scavenge/gc, since
1048   // it's an input to soft ref clearing policy.
1049   {
1050     MutexLocker x(Heap_lock);
1051     Universe::update_heap_info_at_gc();
1052   }
1053 
1054   // ("weak") refs processing infrastructure initialization
1055   Universe::heap()->post_initialize();
1056 
1057   MemoryService::add_metaspace_memory_pools();
1058 
1059   MemoryService::set_universe_heap(Universe::heap());
1060 #if INCLUDE_CDS
1061   MetaspaceShared::post_initialize(CHECK_false);
1062 #endif
1063   return true;
1064 }
1065 
1066 
1067 void Universe::compute_base_vtable_size() {
1068   _base_vtable_size = ClassLoader::compute_Object_vtable();
1069 }
1070 
1071 void Universe::print_on(outputStream* st) {
1072   GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1073   st->print_cr("Heap");
1074   heap()->print_on(st);
1075 }
1076 
1077 void Universe::print_heap_at_SIGBREAK() {
1078   if (PrintHeapAtSIGBREAK) {
1079     print_on(tty);
1080     tty->cr();
1081     tty->flush();
1082   }
1083 }
1084 
1085 void Universe::print_heap_before_gc() {
1086   LogTarget(Debug, gc, heap) lt;
1087   if (lt.is_enabled()) {
1088     LogStream ls(lt);
1089     ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1090     ResourceMark rm;
1091     heap()->print_on(&ls);
1092   }
1093 }
1094 
1095 void Universe::print_heap_after_gc() {
1096   LogTarget(Debug, gc, heap) lt;
1097   if (lt.is_enabled()) {
1098     LogStream ls(lt);
1099     ls.print("Heap after 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::initialize_verify_flags() {
1106   verify_flags = 0;
1107   const char delimiter[] = " ,";
1108 
1109   size_t length = strlen(VerifySubSet);
1110   char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1111   strncpy(subset_list, VerifySubSet, length + 1);
1112 
1113   char* token = strtok(subset_list, delimiter);
1114   while (token != NULL) {
1115     if (strcmp(token, "threads") == 0) {
1116       verify_flags |= Verify_Threads;
1117     } else if (strcmp(token, "heap") == 0) {
1118       verify_flags |= Verify_Heap;
1119     } else if (strcmp(token, "symbol_table") == 0) {
1120       verify_flags |= Verify_SymbolTable;
1121     } else if (strcmp(token, "string_table") == 0) {
1122       verify_flags |= Verify_StringTable;
1123     } else if (strcmp(token, "codecache") == 0) {
1124       verify_flags |= Verify_CodeCache;
1125     } else if (strcmp(token, "dictionary") == 0) {
1126       verify_flags |= Verify_SystemDictionary;
1127     } else if (strcmp(token, "classloader_data_graph") == 0) {
1128       verify_flags |= Verify_ClassLoaderDataGraph;
1129     } else if (strcmp(token, "metaspace") == 0) {
1130       verify_flags |= Verify_MetaspaceUtils;
1131     } else if (strcmp(token, "jni_handles") == 0) {
1132       verify_flags |= Verify_JNIHandles;
1133     } else if (strcmp(token, "codecache_oops") == 0) {
1134       verify_flags |= Verify_CodeCacheOops;
1135     } else {
1136       vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1137     }
1138     token = strtok(NULL, delimiter);
1139   }
1140   FREE_C_HEAP_ARRAY(char, subset_list);
1141 }
1142 
1143 bool Universe::should_verify_subset(uint subset) {
1144   if (verify_flags & subset) {
1145     return true;
1146   }
1147   return false;
1148 }
1149 
1150 void Universe::verify(VerifyOption option, const char* prefix) {
1151   // The use of _verify_in_progress is a temporary work around for
1152   // 6320749.  Don't bother with a creating a class to set and clear
1153   // it since it is only used in this method and the control flow is
1154   // straight forward.
1155   _verify_in_progress = true;
1156 
1157   COMPILER2_PRESENT(
1158     assert(!DerivedPointerTable::is_active(),
1159          "DPT should not be active during verification "
1160          "(of thread stacks below)");
1161   )
1162 
1163   ResourceMark rm;
1164   HandleMark hm;  // Handles created during verification can be zapped
1165   _verify_count++;
1166 
1167   FormatBuffer<> title("Verifying %s", prefix);
1168   GCTraceTime(Info, gc, verify) tm(title.buffer());
1169   if (should_verify_subset(Verify_Threads)) {
1170     log_debug(gc, verify)("Threads");
1171     Threads::verify();
1172   }
1173   if (should_verify_subset(Verify_Heap)) {
1174     log_debug(gc, verify)("Heap");
1175     heap()->verify(option);
1176   }
1177   if (should_verify_subset(Verify_SymbolTable)) {
1178     log_debug(gc, verify)("SymbolTable");
1179     SymbolTable::verify();
1180   }
1181   if (should_verify_subset(Verify_StringTable)) {
1182     log_debug(gc, verify)("StringTable");
1183     StringTable::verify();
1184   }
1185   if (should_verify_subset(Verify_CodeCache)) {
1186   {
1187     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1188     log_debug(gc, verify)("CodeCache");
1189     CodeCache::verify();
1190   }
1191   }
1192   if (should_verify_subset(Verify_SystemDictionary)) {
1193     log_debug(gc, verify)("SystemDictionary");
1194     SystemDictionary::verify();
1195   }
1196 #ifndef PRODUCT
1197   if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1198     log_debug(gc, verify)("ClassLoaderDataGraph");
1199     ClassLoaderDataGraph::verify();
1200   }
1201 #endif
1202   if (should_verify_subset(Verify_MetaspaceUtils)) {
1203     log_debug(gc, verify)("MetaspaceUtils");
1204     MetaspaceUtils::verify_free_chunks();
1205   }
1206   if (should_verify_subset(Verify_JNIHandles)) {
1207     log_debug(gc, verify)("JNIHandles");
1208     JNIHandles::verify();
1209   }
1210   if (should_verify_subset(Verify_CodeCacheOops)) {
1211     log_debug(gc, verify)("CodeCache Oops");
1212     CodeCache::verify_oops();
1213   }
1214 
1215   _verify_in_progress = false;
1216 }
1217 
1218 
1219 #ifndef PRODUCT
1220 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1221   assert(low_boundary < high_boundary, "bad interval");
1222 
1223   // decide which low-order bits we require to be clear:
1224   size_t alignSize = MinObjAlignmentInBytes;
1225   size_t min_object_size = CollectedHeap::min_fill_size();
1226 
1227   // make an inclusive limit:
1228   uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1229   uintptr_t min = (uintptr_t)low_boundary;
1230   assert(min < max, "bad interval");
1231   uintptr_t diff = max ^ min;
1232 
1233   // throw away enough low-order bits to make the diff vanish
1234   uintptr_t mask = (uintptr_t)(-1);
1235   while ((mask & diff) != 0)
1236     mask <<= 1;
1237   uintptr_t bits = (min & mask);
1238   assert(bits == (max & mask), "correct mask");
1239   // check an intermediate value between min and max, just to make sure:
1240   assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1241 
1242   // require address alignment, too:
1243   mask |= (alignSize - 1);
1244 
1245   if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1246     assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1247   }
1248   _verify_oop_mask = mask;
1249   _verify_oop_bits = bits;
1250 }
1251 
1252 // Oop verification (see MacroAssembler::verify_oop)
1253 
1254 uintptr_t Universe::verify_oop_mask() {
1255   MemRegion m = heap()->reserved_region();
1256   calculate_verify_data(m.start(), m.end());
1257   return _verify_oop_mask;
1258 }
1259 
1260 uintptr_t Universe::verify_oop_bits() {
1261   MemRegion m = heap()->reserved_region();
1262   calculate_verify_data(m.start(), m.end());
1263   return _verify_oop_bits;
1264 }
1265 
1266 uintptr_t Universe::verify_mark_mask() {
1267   return markOopDesc::lock_mask_in_place;
1268 }
1269 
1270 uintptr_t Universe::verify_mark_bits() {
1271   intptr_t mask = verify_mark_mask();
1272   intptr_t bits = (intptr_t)markOopDesc::prototype();
1273   assert((bits & ~mask) == 0, "no stray header bits");
1274   return bits;
1275 }
1276 #endif // PRODUCT
1277 
1278 
1279 void Universe::compute_verify_oop_data() {
1280   verify_oop_mask();
1281   verify_oop_bits();
1282   verify_mark_mask();
1283   verify_mark_bits();
1284 }
1285 
1286 
1287 void LatestMethodCache::init(Klass* k, Method* m) {
1288   if (!UseSharedSpaces) {
1289     _klass = k;
1290   }
1291 #ifndef PRODUCT
1292   else {
1293     // sharing initilization should have already set up _klass
1294     assert(_klass != NULL, "just checking");
1295   }
1296 #endif
1297 
1298   _method_idnum = m->method_idnum();
1299   assert(_method_idnum >= 0, "sanity check");
1300 }
1301 
1302 
1303 Method* LatestMethodCache::get_method() {
1304   if (klass() == NULL) return NULL;
1305   InstanceKlass* ik = InstanceKlass::cast(klass());
1306   Method* m = ik->method_with_idnum(method_idnum());
1307   assert(m != NULL, "sanity check");
1308   return m;
1309 }
1310 
1311 
1312 #ifdef ASSERT
1313 // Release dummy object(s) at bottom of heap
1314 bool Universe::release_fullgc_alot_dummy() {
1315   MutexLocker ml(FullGCALot_lock);
1316   if (_fullgc_alot_dummy_array != NULL) {
1317     if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1318       // No more dummies to release, release entire array instead
1319       _fullgc_alot_dummy_array = NULL;
1320       return false;
1321     }
1322     if (!UseConcMarkSweepGC) {
1323       // Release dummy at bottom of old generation
1324       _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1325     }
1326     // Release dummy at bottom of permanent generation
1327     _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1328   }
1329   return true;
1330 }
1331 
1332 #endif // ASSERT
--- EOF ---