1 /*
   2  * Copyright (c) 1997, 2019, 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/symbolTable.hpp"
  32 #include "classfile/systemDictionary.hpp"
  33 #include "classfile/vmSymbols.hpp"
  34 #include "code/codeBehaviours.hpp"
  35 #include "code/codeCache.hpp"
  36 #include "code/dependencies.hpp"
  37 #include "gc/shared/collectedHeap.inline.hpp"
  38 #include "gc/shared/gcArguments.hpp"
  39 #include "gc/shared/gcConfig.hpp"
  40 #include "gc/shared/gcTraceTime.inline.hpp"
  41 #include "interpreter/interpreter.hpp"
  42 #include "logging/log.hpp"
  43 #include "logging/logStream.hpp"
  44 #include "memory/heapShared.hpp"
  45 #include "memory/filemap.hpp"
  46 #include "memory/metadataFactory.hpp"
  47 #include "memory/metaspaceClosure.hpp"
  48 #include "memory/metaspaceCounters.hpp"
  49 #include "memory/metaspaceShared.hpp"
  50 #include "memory/oopFactory.hpp"
  51 #include "memory/resourceArea.hpp"
  52 #include "memory/universe.hpp"
  53 #include "oops/compressedOops.hpp"
  54 #include "oops/constantPool.hpp"
  55 #include "oops/instanceClassLoaderKlass.hpp"
  56 #include "oops/instanceKlass.hpp"
  57 #include "oops/instanceMirrorKlass.hpp"
  58 #include "oops/instanceRefKlass.hpp"
  59 #include "oops/objArrayOop.inline.hpp"
  60 #include "oops/oop.inline.hpp"
  61 #include "oops/typeArrayKlass.hpp"
  62 #include "prims/resolvedMethodTable.hpp"
  63 #include "runtime/arguments.hpp"
  64 #include "runtime/atomic.hpp"
  65 #include "runtime/deoptimization.hpp"
  66 #include "runtime/flags/flagSetting.hpp"
  67 #include "runtime/flags/jvmFlagConstraintList.hpp"
  68 #include "runtime/handles.inline.hpp"
  69 #include "runtime/init.hpp"
  70 #include "runtime/java.hpp"
  71 #include "runtime/javaCalls.hpp"
  72 #include "runtime/sharedRuntime.hpp"
  73 #include "runtime/synchronizer.hpp"
  74 #include "runtime/thread.inline.hpp"
  75 #include "runtime/timerTrace.hpp"
  76 #include "runtime/vmOperations.hpp"
  77 #include "services/memoryService.hpp"
  78 #include "utilities/align.hpp"
  79 #include "utilities/copy.hpp"
  80 #include "utilities/debug.hpp"
  81 #include "utilities/events.hpp"
  82 #include "utilities/formatBuffer.hpp"
  83 #include "utilities/hashtable.inline.hpp"
  84 #include "utilities/macros.hpp"
  85 #include "utilities/ostream.hpp"
  86 #include "utilities/preserveException.hpp"
  87 
  88 // Known objects
  89 Klass* Universe::_typeArrayKlassObjs[T_LONG+1]        = { NULL /*, NULL...*/ };
  90 Klass* Universe::_objectArrayKlassObj                 = NULL;
  91 oop Universe::_int_mirror                             = NULL;
  92 oop Universe::_float_mirror                           = NULL;
  93 oop Universe::_double_mirror                          = NULL;
  94 oop Universe::_byte_mirror                            = NULL;
  95 oop Universe::_bool_mirror                            = NULL;
  96 oop Universe::_char_mirror                            = NULL;
  97 oop Universe::_long_mirror                            = NULL;
  98 oop Universe::_short_mirror                           = NULL;
  99 oop Universe::_void_mirror                            = NULL;
 100 oop Universe::_mirrors[T_VOID+1]                      = { NULL /*, NULL...*/ };
 101 oop Universe::_main_thread_group                      = NULL;
 102 oop Universe::_system_thread_group                    = NULL;
 103 objArrayOop Universe::_the_empty_class_klass_array    = NULL;
 104 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
 105 oop Universe::_the_null_sentinel                      = NULL;
 106 oop Universe::_the_null_string                        = NULL;
 107 oop Universe::_the_min_jint_string                   = NULL;
 108 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
 109 LatestMethodCache* Universe::_loader_addClass_cache    = NULL;
 110 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
 111 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL;
 112 LatestMethodCache* Universe::_do_stack_walk_cache     = NULL;
 113 oop Universe::_out_of_memory_error_java_heap          = NULL;
 114 oop Universe::_out_of_memory_error_metaspace          = NULL;
 115 oop Universe::_out_of_memory_error_class_metaspace    = NULL;
 116 oop Universe::_out_of_memory_error_array_size         = NULL;
 117 oop Universe::_out_of_memory_error_gc_overhead_limit  = NULL;
 118 oop Universe::_out_of_memory_error_realloc_objects    = NULL;
 119 oop Universe::_out_of_memory_error_retry              = NULL;
 120 oop Universe::_delayed_stack_overflow_error_message   = NULL;
 121 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
 122 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
 123 bool Universe::_verify_in_progress                    = false;
 124 long Universe::verify_flags                           = Universe::Verify_All;
 125 oop Universe::_null_ptr_exception_instance            = NULL;
 126 oop Universe::_arithmetic_exception_instance          = NULL;
 127 oop Universe::_virtual_machine_error_instance         = NULL;
 128 oop Universe::_vm_exception                           = NULL;
 129 oop Universe::_reference_pending_list                 = NULL;
 130 
 131 Array<int>* Universe::_the_empty_int_array            = NULL;
 132 Array<u2>* Universe::_the_empty_short_array           = NULL;
 133 Array<Klass*>* Universe::_the_empty_klass_array     = NULL;
 134 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array  = NULL;
 135 Array<Method*>* Universe::_the_empty_method_array   = NULL;
 136 
 137 // These variables are guarded by FullGCALot_lock.
 138 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
 139 debug_only(int Universe::_fullgc_alot_dummy_next      = 0;)
 140 
 141 // Heap
 142 int             Universe::_verify_count = 0;
 143 
 144 // Oop verification (see MacroAssembler::verify_oop)
 145 uintptr_t       Universe::_verify_oop_mask = 0;
 146 uintptr_t       Universe::_verify_oop_bits = (uintptr_t) -1;
 147 
 148 int             Universe::_base_vtable_size = 0;
 149 bool            Universe::_bootstrapping = false;
 150 bool            Universe::_module_initialized = false;
 151 bool            Universe::_fully_initialized = false;
 152 
 153 size_t          Universe::_heap_capacity_at_last_gc;
 154 size_t          Universe::_heap_used_at_last_gc = 0;
 155 
 156 CollectedHeap*  Universe::_collectedHeap = NULL;
 157 
 158 void Universe::basic_type_classes_do(void f(Klass*)) {
 159   for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
 160     f(_typeArrayKlassObjs[i]);
 161   }
 162 }
 163 
 164 void Universe::basic_type_classes_do(KlassClosure *closure) {
 165   for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
 166     closure->do_klass(_typeArrayKlassObjs[i]);
 167   }
 168 }
 169 
 170 void Universe::oops_do(OopClosure* f) {
 171 
 172   f->do_oop((oop*) &_int_mirror);
 173   f->do_oop((oop*) &_float_mirror);
 174   f->do_oop((oop*) &_double_mirror);
 175   f->do_oop((oop*) &_byte_mirror);
 176   f->do_oop((oop*) &_bool_mirror);
 177   f->do_oop((oop*) &_char_mirror);
 178   f->do_oop((oop*) &_long_mirror);
 179   f->do_oop((oop*) &_short_mirror);
 180   f->do_oop((oop*) &_void_mirror);
 181 
 182   for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
 183     f->do_oop((oop*) &_mirrors[i]);
 184   }
 185   assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
 186 
 187   f->do_oop((oop*)&_the_empty_class_klass_array);
 188   f->do_oop((oop*)&_the_null_sentinel);
 189   f->do_oop((oop*)&_the_null_string);
 190   f->do_oop((oop*)&_the_min_jint_string);
 191   f->do_oop((oop*)&_out_of_memory_error_java_heap);
 192   f->do_oop((oop*)&_out_of_memory_error_metaspace);
 193   f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
 194   f->do_oop((oop*)&_out_of_memory_error_array_size);
 195   f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
 196   f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
 197   f->do_oop((oop*)&_out_of_memory_error_retry);
 198   f->do_oop((oop*)&_delayed_stack_overflow_error_message);
 199   f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
 200   f->do_oop((oop*)&_null_ptr_exception_instance);
 201   f->do_oop((oop*)&_arithmetic_exception_instance);
 202   f->do_oop((oop*)&_virtual_machine_error_instance);
 203   f->do_oop((oop*)&_main_thread_group);
 204   f->do_oop((oop*)&_system_thread_group);
 205   f->do_oop((oop*)&_vm_exception);
 206   f->do_oop((oop*)&_reference_pending_list);
 207   debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
 208 }
 209 
 210 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
 211   it->push(&_klass);
 212 }
 213 
 214 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
 215   for (int i = 0; i < T_LONG+1; i++) {
 216     it->push(&_typeArrayKlassObjs[i]);
 217   }
 218   it->push(&_objectArrayKlassObj);
 219 
 220   it->push(&_the_empty_int_array);
 221   it->push(&_the_empty_short_array);
 222   it->push(&_the_empty_klass_array);
 223   it->push(&_the_empty_instance_klass_array);
 224   it->push(&_the_empty_method_array);
 225   it->push(&_the_array_interfaces_array);
 226 
 227   _finalizer_register_cache->metaspace_pointers_do(it);
 228   _loader_addClass_cache->metaspace_pointers_do(it);
 229   _throw_illegal_access_error_cache->metaspace_pointers_do(it);
 230   _throw_no_such_method_error_cache->metaspace_pointers_do(it);
 231   _do_stack_walk_cache->metaspace_pointers_do(it);
 232 }
 233 
 234 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
 235 void Universe::serialize(SerializeClosure* f) {
 236 
 237   for (int i = 0; i < T_LONG+1; i++) {
 238     f->do_ptr((void**)&_typeArrayKlassObjs[i]);
 239   }
 240 
 241   f->do_ptr((void**)&_objectArrayKlassObj);
 242 #if INCLUDE_CDS_JAVA_HEAP
 243 #ifdef ASSERT
 244   if (DumpSharedSpaces && !HeapShared::is_heap_object_archiving_allowed()) {
 245     assert(_int_mirror == NULL    && _float_mirror == NULL &&
 246            _double_mirror == NULL && _byte_mirror == NULL  &&
 247            _bool_mirror == NULL   && _char_mirror == NULL  &&
 248            _long_mirror == NULL   && _short_mirror == NULL &&
 249            _void_mirror == NULL, "mirrors should be NULL");
 250   }
 251 #endif
 252   f->do_mirror_oop(&_int_mirror);
 253   f->do_mirror_oop(&_float_mirror);
 254   f->do_mirror_oop(&_double_mirror);
 255   f->do_mirror_oop(&_byte_mirror);
 256   f->do_mirror_oop(&_bool_mirror);
 257   f->do_mirror_oop(&_char_mirror);
 258   f->do_mirror_oop(&_long_mirror);
 259   f->do_mirror_oop(&_short_mirror);
 260   f->do_mirror_oop(&_void_mirror);
 261 #endif
 262 
 263   f->do_ptr((void**)&_the_array_interfaces_array);
 264   f->do_ptr((void**)&_the_empty_int_array);
 265   f->do_ptr((void**)&_the_empty_short_array);
 266   f->do_ptr((void**)&_the_empty_method_array);
 267   f->do_ptr((void**)&_the_empty_klass_array);
 268   f->do_ptr((void**)&_the_empty_instance_klass_array);
 269   _finalizer_register_cache->serialize(f);
 270   _loader_addClass_cache->serialize(f);
 271   _throw_illegal_access_error_cache->serialize(f);
 272   _throw_no_such_method_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 void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
 532   // init vtable of k and all subclasses
 533   ko->vtable().initialize_vtable(false, CHECK);
 534   if (ko->is_instance_klass()) {
 535     for (Klass* sk = ko->subklass();
 536          sk != NULL;
 537          sk = sk->next_sibling()) {
 538       reinitialize_vtable_of(sk, CHECK);
 539     }
 540   }
 541 }
 542 
 543 void Universe::reinitialize_vtables(TRAPS) {
 544   // The vtables are initialized by starting at java.lang.Object and
 545   // initializing through the subclass links, so that the super
 546   // classes are always initialized first.
 547   Klass* ok = SystemDictionary::Object_klass();
 548   Universe::reinitialize_vtable_of(ok, THREAD);
 549 }
 550 
 551 
 552 void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
 553   k->itable().initialize_itable(false, CHECK);
 554 }
 555 
 556 
 557 void Universe::reinitialize_itables(TRAPS) {
 558   MutexLocker mcld(ClassLoaderDataGraph_lock);
 559   ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
 560 }
 561 
 562 
 563 bool Universe::on_page_boundary(void* addr) {
 564   return is_aligned(addr, os::vm_page_size());
 565 }
 566 
 567 
 568 bool Universe::should_fill_in_stack_trace(Handle throwable) {
 569   // never attempt to fill in the stack trace of preallocated errors that do not have
 570   // backtrace. These errors are kept alive forever and may be "re-used" when all
 571   // preallocated errors with backtrace have been consumed. Also need to avoid
 572   // a potential loop which could happen if an out of memory occurs when attempting
 573   // to allocate the backtrace.
 574   return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
 575           (throwable() != Universe::_out_of_memory_error_metaspace)  &&
 576           (throwable() != Universe::_out_of_memory_error_class_metaspace)  &&
 577           (throwable() != Universe::_out_of_memory_error_array_size) &&
 578           (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
 579           (throwable() != Universe::_out_of_memory_error_realloc_objects) &&
 580           (throwable() != Universe::_out_of_memory_error_retry));
 581 }
 582 
 583 
 584 oop Universe::gen_out_of_memory_error(oop default_err) {
 585   // generate an out of memory error:
 586   // - if there is a preallocated error and stack traces are available
 587   //   (j.l.Throwable is initialized), then return the preallocated
 588   //   error with a filled in stack trace, and with the message
 589   //   provided by the default error.
 590   // - otherwise, return the default error, without a stack trace.
 591   int next;
 592   if ((_preallocated_out_of_memory_error_avail_count > 0) &&
 593       SystemDictionary::Throwable_klass()->is_initialized()) {
 594     next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
 595     assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
 596   } else {
 597     next = -1;
 598   }
 599   if (next < 0) {
 600     // all preallocated errors have been used.
 601     // return default
 602     return default_err;
 603   } else {
 604     Thread* THREAD = Thread::current();
 605     Handle default_err_h(THREAD, default_err);
 606     // get the error object at the slot and set set it to NULL so that the
 607     // array isn't keeping it alive anymore.
 608     Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
 609     assert(exc() != NULL, "slot has been used already");
 610     preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
 611 
 612     // use the message from the default error
 613     oop msg = java_lang_Throwable::message(default_err_h());
 614     assert(msg != NULL, "no message");
 615     java_lang_Throwable::set_message(exc(), msg);
 616 
 617     // populate the stack trace and return it.
 618     java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
 619     return exc();
 620   }
 621 }
 622 
 623 intptr_t Universe::_non_oop_bits = 0;
 624 
 625 void* Universe::non_oop_word() {
 626   // Neither the high bits nor the low bits of this value is allowed
 627   // to look like (respectively) the high or low bits of a real oop.
 628   //
 629   // High and low are CPU-specific notions, but low always includes
 630   // the low-order bit.  Since oops are always aligned at least mod 4,
 631   // setting the low-order bit will ensure that the low half of the
 632   // word will never look like that of a real oop.
 633   //
 634   // Using the OS-supplied non-memory-address word (usually 0 or -1)
 635   // will take care of the high bits, however many there are.
 636 
 637   if (_non_oop_bits == 0) {
 638     _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
 639   }
 640 
 641   return (void*)_non_oop_bits;
 642 }
 643 
 644 static void initialize_global_behaviours() {
 645   CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour());
 646 }
 647 
 648 jint universe_init() {
 649   assert(!Universe::_fully_initialized, "called after initialize_vtables");
 650   guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
 651          "LogHeapWordSize is incorrect.");
 652   guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
 653   guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
 654             "oop size is not not a multiple of HeapWord size");
 655 
 656   TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
 657 
 658   JavaClasses::compute_hard_coded_offsets();
 659 
 660   initialize_global_behaviours();
 661 
 662   GCConfig::arguments()->initialize_heap_sizes();
 663 
 664   jint status = Universe::initialize_heap();
 665   if (status != JNI_OK) {
 666     return status;
 667   }
 668 
 669   Universe::initialize_tlab();
 670 
 671   Metaspace::global_initialize();
 672 
 673   // Initialize performance counters for metaspaces
 674   MetaspaceCounters::initialize_performance_counters();
 675   CompressedClassSpaceCounters::initialize_performance_counters();
 676 
 677   AOTLoader::universe_init();
 678 
 679   // Checks 'AfterMemoryInit' constraints.
 680   if (!JVMFlagConstraintList::check_constraints(JVMFlagConstraint::AfterMemoryInit)) {
 681     return JNI_EINVAL;
 682   }
 683 
 684   // Create memory for metadata.  Must be after initializing heap for
 685   // DumpSharedSpaces.
 686   ClassLoaderData::init_null_class_loader_data();
 687 
 688   // We have a heap so create the Method* caches before
 689   // Metaspace::initialize_shared_spaces() tries to populate them.
 690   Universe::_finalizer_register_cache = new LatestMethodCache();
 691   Universe::_loader_addClass_cache    = new LatestMethodCache();
 692   Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
 693   Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
 694   Universe::_do_stack_walk_cache = new LatestMethodCache();
 695 
 696 #if INCLUDE_CDS
 697   if (UseSharedSpaces) {
 698     // Read the data structures supporting the shared spaces (shared
 699     // system dictionary, symbol table, etc.).  After that, access to
 700     // the file (other than the mapped regions) is no longer needed, and
 701     // the file is closed. Closing the file does not affect the
 702     // currently mapped regions.
 703     MetaspaceShared::initialize_shared_spaces();
 704     StringTable::create_table();
 705   } else
 706 #endif
 707   {
 708     SymbolTable::create_table();
 709     StringTable::create_table();
 710   }
 711 
 712 #if INCLUDE_CDS
 713   if (Arguments::is_dumping_archive()) {
 714     MetaspaceShared::prepare_for_dumping();
 715   }
 716 #endif
 717 
 718   if (strlen(VerifySubSet) > 0) {
 719     Universe::initialize_verify_flags();
 720   }
 721 
 722   ResolvedMethodTable::create_table();
 723 
 724   return JNI_OK;
 725 }
 726 
 727 jint Universe::initialize_heap() {
 728   assert(_collectedHeap == NULL, "Heap already created");
 729   _collectedHeap = GCConfig::arguments()->create_heap();
 730   jint status = _collectedHeap->initialize();
 731 
 732   if (status == JNI_OK) {
 733     log_info(gc)("Using %s", _collectedHeap->name());
 734   }
 735 
 736   return status;
 737 }
 738 
 739 void Universe::initialize_tlab() {
 740   ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
 741   if (UseTLAB) {
 742     assert(Universe::heap()->supports_tlab_allocation(),
 743            "Should support thread-local allocation buffers");
 744     ThreadLocalAllocBuffer::startup_initialization();
 745   }
 746 }
 747 
 748 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
 749 
 750   assert(alignment <= Arguments::conservative_max_heap_alignment(),
 751          "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
 752          alignment, Arguments::conservative_max_heap_alignment());
 753 
 754   size_t total_reserved = align_up(heap_size, alignment);
 755   assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
 756       "heap size is too big for compressed oops");
 757 
 758   bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
 759   assert(!UseLargePages
 760       || UseParallelGC
 761       || use_large_pages, "Wrong alignment to use large pages");
 762 
 763   // Now create the space.
 764   ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
 765 
 766   if (total_rs.is_reserved()) {
 767     assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
 768            "must be exactly of required size and alignment");
 769     // We are good.
 770 
 771     if (AllocateHeapAt != NULL) {
 772       log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
 773     }
 774 
 775     if (UseCompressedOops) {
 776       CompressedOops::initialize(total_rs);
 777     }
 778 
 779     Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
 780 
 781     return total_rs;
 782   }
 783 
 784   vm_exit_during_initialization(
 785     err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
 786             total_reserved/K));
 787 
 788   // satisfy compiler
 789   ShouldNotReachHere();
 790   return ReservedHeapSpace(0, 0, false);
 791 }
 792 
 793 
 794 // It's the caller's responsibility to ensure glitch-freedom
 795 // (if required).
 796 void Universe::update_heap_info_at_gc() {
 797   _heap_capacity_at_last_gc = heap()->capacity();
 798   _heap_used_at_last_gc     = heap()->used();
 799 }
 800 
 801 void initialize_known_method(LatestMethodCache* method_cache,
 802                              InstanceKlass* ik,
 803                              const char* method,
 804                              Symbol* signature,
 805                              bool is_static, TRAPS)
 806 {
 807   TempNewSymbol name = SymbolTable::new_symbol(method);
 808   Method* m = NULL;
 809   // The klass must be linked before looking up the method.
 810   if (!ik->link_class_or_fail(THREAD) ||
 811       ((m = ik->find_method(name, signature)) == NULL) ||
 812       is_static != m->is_static()) {
 813     ResourceMark rm(THREAD);
 814     // NoSuchMethodException doesn't actually work because it tries to run the
 815     // <init> function before java_lang_Class is linked. Print error and exit.
 816     vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
 817                                  ik->name()->as_C_string(), method));
 818   }
 819   method_cache->init(ik, m);
 820 }
 821 
 822 void Universe::initialize_known_methods(TRAPS) {
 823   // Set up static method for registering finalizers
 824   initialize_known_method(_finalizer_register_cache,
 825                           SystemDictionary::Finalizer_klass(),
 826                           "register",
 827                           vmSymbols::object_void_signature(), true, CHECK);
 828 
 829   initialize_known_method(_throw_illegal_access_error_cache,
 830                           SystemDictionary::internal_Unsafe_klass(),
 831                           "throwIllegalAccessError",
 832                           vmSymbols::void_method_signature(), true, CHECK);
 833 
 834   initialize_known_method(_throw_no_such_method_error_cache,
 835                           SystemDictionary::internal_Unsafe_klass(),
 836                           "throwNoSuchMethodError",
 837                           vmSymbols::void_method_signature(), true, CHECK);
 838 
 839   // Set up method for registering loaded classes in class loader vector
 840   initialize_known_method(_loader_addClass_cache,
 841                           SystemDictionary::ClassLoader_klass(),
 842                           "addClass",
 843                           vmSymbols::class_void_signature(), false, CHECK);
 844 
 845   // Set up method for stack walking
 846   initialize_known_method(_do_stack_walk_cache,
 847                           SystemDictionary::AbstractStackWalker_klass(),
 848                           "doStackWalk",
 849                           vmSymbols::doStackWalk_signature(), false, CHECK);
 850 }
 851 
 852 void universe2_init() {
 853   EXCEPTION_MARK;
 854   Universe::genesis(CATCH);
 855 }
 856 
 857 // Set after initialization of the module runtime, call_initModuleRuntime
 858 void universe_post_module_init() {
 859   Universe::_module_initialized = true;
 860 }
 861 
 862 bool universe_post_init() {
 863   assert(!is_init_completed(), "Error: initialization not yet completed!");
 864   Universe::_fully_initialized = true;
 865   EXCEPTION_MARK;
 866   { ResourceMark rm;
 867     Interpreter::initialize();      // needed for interpreter entry points
 868     if (!UseSharedSpaces) {
 869       Universe::reinitialize_vtables(CHECK_false);
 870       Universe::reinitialize_itables(CHECK_false);
 871     }
 872   }
 873 
 874   HandleMark hm(THREAD);
 875   // Setup preallocated empty java.lang.Class array
 876   Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
 877 
 878   // Setup preallocated OutOfMemoryError errors
 879   Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
 880   InstanceKlass* ik = InstanceKlass::cast(k);
 881   Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
 882   Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
 883   Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
 884   Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
 885   Universe::_out_of_memory_error_gc_overhead_limit =
 886     ik->allocate_instance(CHECK_false);
 887   Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
 888   Universe::_out_of_memory_error_retry = ik->allocate_instance(CHECK_false);
 889 
 890   // Setup preallocated cause message for delayed StackOverflowError
 891   if (StackReservedPages > 0) {
 892     Universe::_delayed_stack_overflow_error_message =
 893       java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
 894   }
 895 
 896   // Setup preallocated NullPointerException
 897   // (this is currently used for a cheap & dirty solution in compiler exception handling)
 898   k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
 899   Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 900   // Setup preallocated ArithmeticException
 901   // (this is currently used for a cheap & dirty solution in compiler exception handling)
 902   k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
 903   Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 904   // Virtual Machine Error for when we get into a situation we can't resolve
 905   k = SystemDictionary::resolve_or_fail(
 906     vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
 907   bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
 908   if (!linked) {
 909      tty->print_cr("Unable to link/verify VirtualMachineError class");
 910      return false; // initialization failed
 911   }
 912   Universe::_virtual_machine_error_instance =
 913     InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 914 
 915   Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 916 
 917   Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
 918   java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
 919 
 920   msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
 921   java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
 922   msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
 923   java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
 924 
 925   msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
 926   java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
 927 
 928   msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
 929   java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
 930 
 931   msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
 932   java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
 933 
 934   msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK_false);
 935   java_lang_Throwable::set_message(Universe::_out_of_memory_error_retry, msg());
 936 
 937   msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
 938   java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
 939 
 940   // Setup the array of errors that have preallocated backtrace
 941   k = Universe::_out_of_memory_error_java_heap->klass();
 942   assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
 943   ik = InstanceKlass::cast(k);
 944 
 945   int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
 946   Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
 947   for (int i=0; i<len; i++) {
 948     oop err = ik->allocate_instance(CHECK_false);
 949     Handle err_h = Handle(THREAD, err);
 950     java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
 951     Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
 952   }
 953   Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
 954 
 955   Universe::initialize_known_methods(CHECK_false);
 956 
 957   // This needs to be done before the first scavenge/gc, since
 958   // it's an input to soft ref clearing policy.
 959   {
 960     MutexLocker x(Heap_lock);
 961     Universe::update_heap_info_at_gc();
 962   }
 963 
 964   // ("weak") refs processing infrastructure initialization
 965   Universe::heap()->post_initialize();
 966 
 967   MemoryService::add_metaspace_memory_pools();
 968 
 969   MemoryService::set_universe_heap(Universe::heap());
 970 #if INCLUDE_CDS
 971   MetaspaceShared::post_initialize(CHECK_false);
 972 #endif
 973   return true;
 974 }
 975 
 976 
 977 void Universe::compute_base_vtable_size() {
 978   _base_vtable_size = ClassLoader::compute_Object_vtable();
 979 }
 980 
 981 void Universe::print_on(outputStream* st) {
 982   GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
 983   st->print_cr("Heap");
 984   heap()->print_on(st);
 985 }
 986 
 987 void Universe::print_heap_at_SIGBREAK() {
 988   if (PrintHeapAtSIGBREAK) {
 989     print_on(tty);
 990     tty->cr();
 991     tty->flush();
 992   }
 993 }
 994 
 995 void Universe::print_heap_before_gc() {
 996   LogTarget(Debug, gc, heap) lt;
 997   if (lt.is_enabled()) {
 998     LogStream ls(lt);
 999     ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1000     ResourceMark rm;
1001     heap()->print_on(&ls);
1002   }
1003 }
1004 
1005 void Universe::print_heap_after_gc() {
1006   LogTarget(Debug, gc, heap) lt;
1007   if (lt.is_enabled()) {
1008     LogStream ls(lt);
1009     ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
1010     ResourceMark rm;
1011     heap()->print_on(&ls);
1012   }
1013 }
1014 
1015 void Universe::initialize_verify_flags() {
1016   verify_flags = 0;
1017   const char delimiter[] = " ,";
1018 
1019   size_t length = strlen(VerifySubSet);
1020   char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1021   strncpy(subset_list, VerifySubSet, length + 1);
1022   char* save_ptr;
1023 
1024   char* token = strtok_r(subset_list, delimiter, &save_ptr);
1025   while (token != NULL) {
1026     if (strcmp(token, "threads") == 0) {
1027       verify_flags |= Verify_Threads;
1028     } else if (strcmp(token, "heap") == 0) {
1029       verify_flags |= Verify_Heap;
1030     } else if (strcmp(token, "symbol_table") == 0) {
1031       verify_flags |= Verify_SymbolTable;
1032     } else if (strcmp(token, "string_table") == 0) {
1033       verify_flags |= Verify_StringTable;
1034     } else if (strcmp(token, "codecache") == 0) {
1035       verify_flags |= Verify_CodeCache;
1036     } else if (strcmp(token, "dictionary") == 0) {
1037       verify_flags |= Verify_SystemDictionary;
1038     } else if (strcmp(token, "classloader_data_graph") == 0) {
1039       verify_flags |= Verify_ClassLoaderDataGraph;
1040     } else if (strcmp(token, "metaspace") == 0) {
1041       verify_flags |= Verify_MetaspaceUtils;
1042     } else if (strcmp(token, "jni_handles") == 0) {
1043       verify_flags |= Verify_JNIHandles;
1044     } else if (strcmp(token, "codecache_oops") == 0) {
1045       verify_flags |= Verify_CodeCacheOops;
1046     } else if (strcmp(token, "resolved_method_table") == 0) {
1047       verify_flags |= Verify_ResolvedMethodTable;
1048     } else {
1049       vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1050     }
1051     token = strtok_r(NULL, delimiter, &save_ptr);
1052   }
1053   FREE_C_HEAP_ARRAY(char, subset_list);
1054 }
1055 
1056 bool Universe::should_verify_subset(uint subset) {
1057   if (verify_flags & subset) {
1058     return true;
1059   }
1060   return false;
1061 }
1062 
1063 void Universe::verify(VerifyOption option, const char* prefix) {
1064   // The use of _verify_in_progress is a temporary work around for
1065   // 6320749.  Don't bother with a creating a class to set and clear
1066   // it since it is only used in this method and the control flow is
1067   // straight forward.
1068   _verify_in_progress = true;
1069 
1070   COMPILER2_PRESENT(
1071     assert(!DerivedPointerTable::is_active(),
1072          "DPT should not be active during verification "
1073          "(of thread stacks below)");
1074   )
1075 
1076   ResourceMark rm;
1077   HandleMark hm;  // Handles created during verification can be zapped
1078   _verify_count++;
1079 
1080   FormatBuffer<> title("Verifying %s", prefix);
1081   GCTraceTime(Info, gc, verify) tm(title.buffer());
1082   if (should_verify_subset(Verify_Threads)) {
1083     log_debug(gc, verify)("Threads");
1084     Threads::verify();
1085   }
1086   if (should_verify_subset(Verify_Heap)) {
1087     log_debug(gc, verify)("Heap");
1088     heap()->verify(option);
1089   }
1090   if (should_verify_subset(Verify_SymbolTable)) {
1091     log_debug(gc, verify)("SymbolTable");
1092     SymbolTable::verify();
1093   }
1094   if (should_verify_subset(Verify_StringTable)) {
1095     log_debug(gc, verify)("StringTable");
1096     StringTable::verify();
1097   }
1098   if (should_verify_subset(Verify_CodeCache)) {
1099   {
1100     MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1101     log_debug(gc, verify)("CodeCache");
1102     CodeCache::verify();
1103   }
1104   }
1105   if (should_verify_subset(Verify_SystemDictionary)) {
1106     log_debug(gc, verify)("SystemDictionary");
1107     SystemDictionary::verify();
1108   }
1109 #ifndef PRODUCT
1110   if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1111     log_debug(gc, verify)("ClassLoaderDataGraph");
1112     ClassLoaderDataGraph::verify();
1113   }
1114 #endif
1115   if (should_verify_subset(Verify_MetaspaceUtils)) {
1116     log_debug(gc, verify)("MetaspaceUtils");
1117     MetaspaceUtils::verify_free_chunks();
1118   }
1119   if (should_verify_subset(Verify_JNIHandles)) {
1120     log_debug(gc, verify)("JNIHandles");
1121     JNIHandles::verify();
1122   }
1123   if (should_verify_subset(Verify_CodeCacheOops)) {
1124     log_debug(gc, verify)("CodeCache Oops");
1125     CodeCache::verify_oops();
1126   }
1127   if (should_verify_subset(Verify_ResolvedMethodTable)) {
1128     log_debug(gc, verify)("ResolvedMethodTable Oops");
1129     ResolvedMethodTable::verify();
1130   }
1131 
1132   _verify_in_progress = false;
1133 }
1134 
1135 
1136 #ifndef PRODUCT
1137 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1138   assert(low_boundary < high_boundary, "bad interval");
1139 
1140   // decide which low-order bits we require to be clear:
1141   size_t alignSize = MinObjAlignmentInBytes;
1142   size_t min_object_size = CollectedHeap::min_fill_size();
1143 
1144   // make an inclusive limit:
1145   uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1146   uintptr_t min = (uintptr_t)low_boundary;
1147   assert(min < max, "bad interval");
1148   uintptr_t diff = max ^ min;
1149 
1150   // throw away enough low-order bits to make the diff vanish
1151   uintptr_t mask = (uintptr_t)(-1);
1152   while ((mask & diff) != 0)
1153     mask <<= 1;
1154   uintptr_t bits = (min & mask);
1155   assert(bits == (max & mask), "correct mask");
1156   // check an intermediate value between min and max, just to make sure:
1157   assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1158 
1159   // require address alignment, too:
1160   mask |= (alignSize - 1);
1161 
1162   if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1163     assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1164   }
1165   _verify_oop_mask = mask;
1166   _verify_oop_bits = bits;
1167 }
1168 
1169 // Oop verification (see MacroAssembler::verify_oop)
1170 
1171 uintptr_t Universe::verify_oop_mask() {
1172   return _verify_oop_mask;
1173 }
1174 
1175 uintptr_t Universe::verify_oop_bits() {
1176   return _verify_oop_bits;
1177 }
1178 
1179 uintptr_t Universe::verify_mark_mask() {
1180   return markWord::lock_mask_in_place;
1181 }
1182 
1183 uintptr_t Universe::verify_mark_bits() {
1184   intptr_t mask = verify_mark_mask();
1185   intptr_t bits = (intptr_t)markWord::prototype().value();
1186   assert((bits & ~mask) == 0, "no stray header bits");
1187   return bits;
1188 }
1189 #endif // PRODUCT
1190 
1191 
1192 void LatestMethodCache::init(Klass* k, Method* m) {
1193   if (!UseSharedSpaces) {
1194     _klass = k;
1195   }
1196 #ifndef PRODUCT
1197   else {
1198     // sharing initilization should have already set up _klass
1199     assert(_klass != NULL, "just checking");
1200   }
1201 #endif
1202 
1203   _method_idnum = m->method_idnum();
1204   assert(_method_idnum >= 0, "sanity check");
1205 }
1206 
1207 
1208 Method* LatestMethodCache::get_method() {
1209   if (klass() == NULL) return NULL;
1210   InstanceKlass* ik = InstanceKlass::cast(klass());
1211   Method* m = ik->method_with_idnum(method_idnum());
1212   assert(m != NULL, "sanity check");
1213   return m;
1214 }
1215 
1216 
1217 #ifdef ASSERT
1218 // Release dummy object(s) at bottom of heap
1219 bool Universe::release_fullgc_alot_dummy() {
1220   MutexLocker ml(FullGCALot_lock);
1221   if (_fullgc_alot_dummy_array != NULL) {
1222     if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1223       // No more dummies to release, release entire array instead
1224       _fullgc_alot_dummy_array = NULL;
1225       return false;
1226     }
1227     if (!UseConcMarkSweepGC) {
1228       // Release dummy at bottom of old generation
1229       _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1230     }
1231     // Release dummy at bottom of permanent generation
1232     _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1233   }
1234   return true;
1235 }
1236 
1237 #endif // ASSERT