1 /*
   2  * Copyright (c) 1997, 2021, 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 "cds/dynamicArchive.hpp"
  27 #include "cds/heapShared.hpp"
  28 #include "cds/metaspaceShared.hpp"
  29 #include "classfile/classLoader.hpp"
  30 #include "classfile/classLoaderDataGraph.hpp"
  31 #include "classfile/javaClasses.hpp"
  32 #include "classfile/stringTable.hpp"
  33 #include "classfile/symbolTable.hpp"
  34 #include "classfile/systemDictionary.hpp"
  35 #include "classfile/vmClasses.hpp"
  36 #include "classfile/vmSymbols.hpp"
  37 #include "code/codeBehaviours.hpp"
  38 #include "code/codeCache.hpp"
  39 #include "compiler/oopMap.hpp"
  40 #include "gc/shared/collectedHeap.inline.hpp"
  41 #include "gc/shared/gcArguments.hpp"
  42 #include "gc/shared/gcConfig.hpp"
  43 #include "gc/shared/gcLogPrecious.hpp"
  44 #include "gc/shared/gcTraceTime.inline.hpp"
  45 #include "gc/shared/oopStorageSet.hpp"
  46 #include "gc/shared/stringdedup/stringDedup.hpp"
  47 #include "gc/shared/tlab_globals.hpp"
  48 #include "logging/log.hpp"
  49 #include "logging/logStream.hpp"
  50 #include "memory/metadataFactory.hpp"
  51 #include "memory/metaspaceClosure.hpp"
  52 #include "memory/metaspaceCounters.hpp"
  53 #include "memory/metaspaceUtils.hpp"
  54 #include "memory/oopFactory.hpp"
  55 #include "memory/resourceArea.hpp"
  56 #include "memory/universe.hpp"
  57 #include "oops/compressedOops.hpp"
  58 #include "oops/instanceKlass.hpp"
  59 #include "oops/instanceMirrorKlass.hpp"

  60 #include "oops/klass.inline.hpp"
  61 #include "oops/objArrayOop.inline.hpp"
  62 #include "oops/oop.inline.hpp"
  63 #include "oops/oopHandle.inline.hpp"
  64 #include "oops/typeArrayKlass.hpp"
  65 #include "prims/resolvedMethodTable.hpp"
  66 #include "runtime/arguments.hpp"
  67 #include "runtime/atomic.hpp"
  68 #include "runtime/flags/jvmFlagLimit.hpp"
  69 #include "runtime/handles.inline.hpp"
  70 #include "runtime/init.hpp"
  71 #include "runtime/java.hpp"
  72 #include "runtime/jniHandles.hpp"
  73 #include "runtime/thread.inline.hpp"
  74 #include "runtime/timerTrace.hpp"
  75 #include "services/memoryService.hpp"
  76 #include "utilities/align.hpp"
  77 #include "utilities/autoRestore.hpp"
  78 #include "utilities/debug.hpp"
  79 #include "utilities/formatBuffer.hpp"
  80 #include "utilities/macros.hpp"
  81 #include "utilities/ostream.hpp"
  82 #include "utilities/preserveException.hpp"
  83 
  84 // Known objects
  85 Klass* Universe::_typeArrayKlassObjs[T_LONG+1]        = { NULL /*, NULL...*/ };
  86 Klass* Universe::_objectArrayKlassObj                 = NULL;
  87 OopHandle Universe::_mirrors[T_VOID+1];
  88 
  89 OopHandle Universe::_main_thread_group;
  90 OopHandle Universe::_system_thread_group;
  91 OopHandle Universe::_the_empty_class_array;
  92 OopHandle Universe::_the_null_string;
  93 OopHandle Universe::_the_min_jint_string;
  94 
  95 OopHandle Universe::_the_null_sentinel;
  96 
  97 // _out_of_memory_errors is an objArray
  98 enum OutOfMemoryInstance { _oom_java_heap,
  99                            _oom_c_heap,
 100                            _oom_metaspace,
 101                            _oom_class_metaspace,
 102                            _oom_array_size,
 103                            _oom_gc_overhead_limit,
 104                            _oom_realloc_objects,
 105                            _oom_retry,
 106                            _oom_count };
 107 
 108 OopHandle Universe::_out_of_memory_errors;
 109 OopHandle Universe::_delayed_stack_overflow_error_message;
 110 OopHandle Universe::_preallocated_out_of_memory_error_array;
 111 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
 112 
 113 OopHandle Universe::_null_ptr_exception_instance;
 114 OopHandle Universe::_arithmetic_exception_instance;
 115 OopHandle Universe::_virtual_machine_error_instance;
 116 
 117 OopHandle Universe::_reference_pending_list;
 118 
 119 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
 120 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
 121 LatestMethodCache* Universe::_loader_addClass_cache    = NULL;
 122 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
 123 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL;
 124 LatestMethodCache* Universe::_do_stack_walk_cache     = NULL;
 125 
 126 long Universe::verify_flags                           = Universe::Verify_All;
 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(OopHandle Universe::_fullgc_alot_dummy_array;)
 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 OopStorage*     Universe::_vm_weak = NULL;
 151 OopStorage*     Universe::_vm_global = NULL;
 152 
 153 CollectedHeap*  Universe::_collectedHeap = NULL;
 154 
 155 objArrayOop Universe::the_empty_class_array ()  {
 156   return (objArrayOop)_the_empty_class_array.resolve();
 157 }
 158 
 159 oop Universe::main_thread_group()                 { return _main_thread_group.resolve(); }
 160 void Universe::set_main_thread_group(oop group)   { _main_thread_group = OopHandle(vm_global(), group); }
 161 
 162 oop Universe::system_thread_group()               { return _system_thread_group.resolve(); }
 163 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
 164 
 165 oop Universe::the_null_string()                   { return _the_null_string.resolve(); }
 166 oop Universe::the_min_jint_string()               { return _the_min_jint_string.resolve(); }
 167 
 168 oop Universe::null_ptr_exception_instance()       { return _null_ptr_exception_instance.resolve(); }
 169 oop Universe::arithmetic_exception_instance()     { return _arithmetic_exception_instance.resolve(); }
 170 oop Universe::virtual_machine_error_instance()    { return _virtual_machine_error_instance.resolve(); }
 171 
 172 oop Universe::the_null_sentinel()                 { return _the_null_sentinel.resolve(); }
 173 
 174 oop Universe::int_mirror()                        { return check_mirror(_mirrors[T_INT].resolve()); }
 175 oop Universe::float_mirror()                      { return check_mirror(_mirrors[T_FLOAT].resolve()); }
 176 oop Universe::double_mirror()                     { return check_mirror(_mirrors[T_DOUBLE].resolve()); }
 177 oop Universe::byte_mirror()                       { return check_mirror(_mirrors[T_BYTE].resolve()); }
 178 oop Universe::bool_mirror()                       { return check_mirror(_mirrors[T_BOOLEAN].resolve()); }
 179 oop Universe::char_mirror()                       { return check_mirror(_mirrors[T_CHAR].resolve()); }
 180 oop Universe::long_mirror()                       { return check_mirror(_mirrors[T_LONG].resolve()); }
 181 oop Universe::short_mirror()                      { return check_mirror(_mirrors[T_SHORT].resolve()); }
 182 oop Universe::void_mirror()                       { return check_mirror(_mirrors[T_VOID].resolve()); }
 183 
 184 oop Universe::java_mirror(BasicType t) {
 185   assert((uint)t < T_VOID+1, "range check");
 186   return check_mirror(_mirrors[t].resolve());
 187 }
 188 
 189 // Used by CDS dumping
 190 void Universe::replace_mirror(BasicType t, oop new_mirror) {
 191   Universe::_mirrors[t].replace(new_mirror);
 192 }
 193 
 194 void Universe::basic_type_classes_do(void f(Klass*)) {
 195   for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
 196     f(_typeArrayKlassObjs[i]);
 197   }
 198 }
 199 
 200 void Universe::basic_type_classes_do(KlassClosure *closure) {
 201   for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
 202     closure->do_klass(_typeArrayKlassObjs[i]);
 203   }
 204 }
 205 
 206 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
 207   it->push(&_klass);
 208 }
 209 
 210 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
 211   for (int i = 0; i < T_LONG+1; i++) {
 212     it->push(&_typeArrayKlassObjs[i]);
 213   }
 214   it->push(&_objectArrayKlassObj);
 215 
 216   it->push(&_the_empty_int_array);
 217   it->push(&_the_empty_short_array);
 218   it->push(&_the_empty_klass_array);
 219   it->push(&_the_empty_instance_klass_array);
 220   it->push(&_the_empty_method_array);
 221   it->push(&_the_array_interfaces_array);
 222 
 223   _finalizer_register_cache->metaspace_pointers_do(it);
 224   _loader_addClass_cache->metaspace_pointers_do(it);
 225   _throw_illegal_access_error_cache->metaspace_pointers_do(it);
 226   _throw_no_such_method_error_cache->metaspace_pointers_do(it);
 227   _do_stack_walk_cache->metaspace_pointers_do(it);
 228 }
 229 
 230 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
 231 void Universe::serialize(SerializeClosure* f) {
 232 
 233 #if INCLUDE_CDS_JAVA_HEAP
 234   {
 235     oop mirror_oop;
 236     for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
 237       if (f->reading()) {
 238         f->do_oop(&mirror_oop); // read from archive
 239         assert(oopDesc::is_oop_or_null(mirror_oop), "is oop");
 240         // Only create an OopHandle for non-null mirrors
 241         if (mirror_oop != NULL) {
 242           _mirrors[i] = OopHandle(vm_global(), mirror_oop);
 243         }
 244       } else {
 245         if (HeapShared::can_write()) {
 246           mirror_oop = _mirrors[i].resolve();
 247         } else {
 248           mirror_oop = NULL;
 249         }
 250         f->do_oop(&mirror_oop); // write to archive
 251       }
 252       if (mirror_oop != NULL) { // may be null if archived heap is disabled
 253         java_lang_Class::update_archived_primitive_mirror_native_pointers(mirror_oop);
 254       }
 255     }
 256   }
 257 #endif
 258 
 259   for (int i = 0; i < T_LONG+1; i++) {
 260     f->do_ptr((void**)&_typeArrayKlassObjs[i]);
 261   }
 262 
 263   f->do_ptr((void**)&_objectArrayKlassObj);
 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   _throw_no_such_method_error_cache->serialize(f);
 274   _do_stack_walk_cache->serialize(f);
 275 }
 276 
 277 
 278 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
 279   if (size < alignment || size % alignment != 0) {
 280     vm_exit_during_initialization(
 281       err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
 282   }
 283 }
 284 
 285 void initialize_basic_type_klass(Klass* k, TRAPS) {
 286   Klass* ok = vmClasses::Object_klass();
 287 #if INCLUDE_CDS
 288   if (UseSharedSpaces) {
 289     ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
 290     assert(k->super() == ok, "u3");
 291     if (k->is_instance_klass()) {
 292       InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK);
 293     } else {
 294       ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
 295     }
 296   } else
 297 #endif
 298   {
 299     k->initialize_supers(ok, NULL, CHECK);
 300   }
 301   k->append_to_sibling_list();
 302 }
 303 
 304 void Universe::genesis(TRAPS) {
 305   ResourceMark rm(THREAD);
 306   HandleMark   hm(THREAD);
 307 
 308   { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
 309 
 310     { MutexLocker mc(THREAD, Compile_lock);
 311 
 312       java_lang_Class::allocate_fixup_lists();
 313 
 314       // determine base vtable size; without that we cannot create the array klasses
 315       compute_base_vtable_size();
 316 
 317       if (!UseSharedSpaces) {
 318         for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
 319           _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
 320         }
 321 
 322         ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
 323 
 324         _the_array_interfaces_array     = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
 325         _the_empty_int_array            = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
 326         _the_empty_short_array          = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
 327         _the_empty_method_array         = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
 328         _the_empty_klass_array          = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
 329         _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
 330       }
 331     }
 332 
 333     vmSymbols::initialize();
 334 
 335     SystemDictionary::initialize(CHECK);
 336 
 337     // Create string constants
 338     oop s = StringTable::intern("null", CHECK);
 339     _the_null_string = OopHandle(vm_global(), s);
 340     s = StringTable::intern("-2147483648", CHECK);
 341     _the_min_jint_string = OopHandle(vm_global(), s);
 342 
 343 
 344 #if INCLUDE_CDS
 345     if (UseSharedSpaces) {
 346       // Verify shared interfaces array.
 347       assert(_the_array_interfaces_array->at(0) ==
 348              vmClasses::Cloneable_klass(), "u3");
 349       assert(_the_array_interfaces_array->at(1) ==
 350              vmClasses::Serializable_klass(), "u3");
 351     } else
 352 #endif
 353     {
 354       // Set up shared interfaces array.  (Do this before supers are set up.)
 355       _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass());
 356       _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass());
 357     }
 358 
 359     initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
 360     initialize_basic_type_klass(charArrayKlassObj(), CHECK);
 361     initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
 362     initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
 363     initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
 364     initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
 365     initialize_basic_type_klass(intArrayKlassObj(), CHECK);
 366     initialize_basic_type_klass(longArrayKlassObj(), CHECK);


 367   } // end of core bootstrapping
 368 
 369   {
 370     Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
 371     _the_null_sentinel = OopHandle(vm_global(), tns());
 372   }
 373 
 374   // Create a handle for reference_pending_list
 375   _reference_pending_list = OopHandle(vm_global(), NULL);
 376 
 377   // Maybe this could be lifted up now that object array can be initialized
 378   // during the bootstrapping.
 379 
 380   // OLD
 381   // Initialize _objectArrayKlass after core bootstraping to make
 382   // sure the super class is set up properly for _objectArrayKlass.
 383   // ---
 384   // NEW
 385   // Since some of the old system object arrays have been converted to
 386   // ordinary object arrays, _objectArrayKlass will be loaded when
 387   // SystemDictionary::initialize(CHECK); is run. See the extra check
 388   // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
 389   _objectArrayKlassObj = InstanceKlass::
 390     cast(vmClasses::Object_klass())->array_klass(1, CHECK);
 391   // OLD
 392   // Add the class to the class hierarchy manually to make sure that
 393   // its vtable is initialized after core bootstrapping is completed.
 394   // ---
 395   // New
 396   // Have already been initialized.
 397   _objectArrayKlassObj->append_to_sibling_list();
 398 
 399   #ifdef ASSERT
 400   if (FullGCALot) {
 401     // Allocate an array of dummy objects.
 402     // We'd like these to be at the bottom of the old generation,
 403     // so that when we free one and then collect,
 404     // (almost) the whole heap moves
 405     // and we find out if we actually update all the oops correctly.
 406     // But we can't allocate directly in the old generation,
 407     // so we allocate wherever, and hope that the first collection
 408     // moves these objects to the bottom of the old generation.
 409     int size = FullGCALotDummies * 2;
 410 
 411     objArrayOop    naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK);
 412     objArrayHandle dummy_array(THREAD, naked_array);
 413     int i = 0;
 414     while (i < size) {
 415         // Allocate dummy in old generation
 416       oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK);
 417       dummy_array->obj_at_put(i++, dummy);
 418     }
 419     {
 420       // Only modify the global variable inside the mutex.
 421       // If we had a race to here, the other dummy_array instances
 422       // and their elements just get dropped on the floor, which is fine.
 423       MutexLocker ml(THREAD, FullGCALot_lock);
 424       if (_fullgc_alot_dummy_array.is_empty()) {
 425         _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
 426       }
 427     }
 428     assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
 429   }
 430   #endif
 431 }
 432 
 433 void Universe::initialize_basic_type_mirrors(TRAPS) {
 434 #if INCLUDE_CDS_JAVA_HEAP
 435     if (UseSharedSpaces &&
 436         HeapShared::are_archived_mirrors_available() &&
 437         _mirrors[T_INT].resolve() != NULL) {
 438       assert(HeapShared::can_use(), "Sanity");
 439 
 440       // check that all mirrors are mapped also
 441       for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
 442         if (!is_reference_type((BasicType)i)) {
 443           oop m = _mirrors[i].resolve();
 444           assert(m != NULL, "archived mirrors should not be NULL");
 445         }
 446       }
 447     } else
 448       // _mirror[T_INT} could be NULL if archived heap is not mapped.
 449 #endif
 450     {
 451       for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
 452         BasicType bt = (BasicType)i;
 453         if (!is_reference_type(bt)) {
 454           oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
 455           _mirrors[i] = OopHandle(vm_global(), m);
 456         }
 457       }
 458     }
 459 }
 460 
 461 void Universe::fixup_mirrors(TRAPS) {
 462   // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
 463   // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
 464   // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
 465   // that the number of objects allocated at this point is very small.
 466   assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded");
 467   HandleMark hm(THREAD);
 468 
 469   if (!UseSharedSpaces) {
 470     // Cache the start of the static fields
 471     InstanceMirrorKlass::init_offset_of_static_fields();
 472   }
 473 
 474   GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
 475   int list_length = list->length();
 476   for (int i = 0; i < list_length; i++) {
 477     Klass* k = list->at(i);
 478     assert(k->is_klass(), "List should only hold classes");
 479     java_lang_Class::fixup_mirror(k, CATCH);
 480   }
 481   delete java_lang_Class::fixup_mirror_list();
 482   java_lang_Class::set_fixup_mirror_list(NULL);
 483 }
 484 
 485 #define assert_pll_locked(test) \
 486   assert(Heap_lock->test(), "Reference pending list access requires lock")
 487 
 488 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
 489 
 490 oop Universe::reference_pending_list() {
 491   if (Thread::current()->is_VM_thread()) {
 492     assert_pll_locked(is_locked);
 493   } else {
 494     assert_pll_ownership();
 495   }
 496   return _reference_pending_list.resolve();
 497 }
 498 
 499 void Universe::clear_reference_pending_list() {
 500   assert_pll_ownership();
 501   _reference_pending_list.replace(NULL);
 502 }
 503 
 504 bool Universe::has_reference_pending_list() {
 505   assert_pll_ownership();
 506   return _reference_pending_list.peek() != NULL;
 507 }
 508 
 509 oop Universe::swap_reference_pending_list(oop list) {
 510   assert_pll_locked(is_locked);
 511   return _reference_pending_list.xchg(list);
 512 }
 513 
 514 #undef assert_pll_locked
 515 #undef assert_pll_ownership
 516 
 517 static void reinitialize_vtables() {
 518   // The vtables are initialized by starting at java.lang.Object and
 519   // initializing through the subclass links, so that the super
 520   // classes are always initialized first.
 521   for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
 522     Klass* sub = iter.klass();
 523     sub->vtable().initialize_vtable();
 524   }
 525 }
 526 
 527 static void reinitialize_itables() {
 528 
 529   class ReinitTableClosure : public KlassClosure {
 530    public:
 531     void do_klass(Klass* k) {
 532       if (k->is_instance_klass()) {
 533          InstanceKlass::cast(k)->itable().initialize_itable();
 534       }
 535     }
 536   };
 537 
 538   MutexLocker mcld(ClassLoaderDataGraph_lock);
 539   ReinitTableClosure cl;
 540   ClassLoaderDataGraph::classes_do(&cl);
 541 }
 542 
 543 
 544 bool Universe::on_page_boundary(void* addr) {
 545   return is_aligned(addr, os::vm_page_size());
 546 }
 547 
 548 // the array of preallocated errors with backtraces
 549 objArrayOop Universe::preallocated_out_of_memory_errors() {
 550   return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
 551 }
 552 
 553 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
 554 
 555 oop Universe::out_of_memory_error_java_heap() {
 556   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
 557 }
 558 
 559 oop Universe::out_of_memory_error_c_heap() {
 560   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
 561 }
 562 
 563 oop Universe::out_of_memory_error_metaspace() {
 564   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
 565 }
 566 
 567 oop Universe::out_of_memory_error_class_metaspace() {
 568   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
 569 }
 570 
 571 oop Universe::out_of_memory_error_array_size() {
 572   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
 573 }
 574 
 575 oop Universe::out_of_memory_error_gc_overhead_limit() {
 576   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
 577 }
 578 
 579 oop Universe::out_of_memory_error_realloc_objects() {
 580   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
 581 }
 582 
 583 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM
 584 oop Universe::out_of_memory_error_retry()              { return out_of_memory_errors()->obj_at(_oom_retry);  }
 585 oop Universe::delayed_stack_overflow_error_message()   { return _delayed_stack_overflow_error_message.resolve(); }
 586 
 587 
 588 bool Universe::should_fill_in_stack_trace(Handle throwable) {
 589   // never attempt to fill in the stack trace of preallocated errors that do not have
 590   // backtrace. These errors are kept alive forever and may be "re-used" when all
 591   // preallocated errors with backtrace have been consumed. Also need to avoid
 592   // a potential loop which could happen if an out of memory occurs when attempting
 593   // to allocate the backtrace.
 594   objArrayOop preallocated_oom = out_of_memory_errors();
 595   for (int i = 0; i < _oom_count; i++) {
 596     if (throwable() == preallocated_oom->obj_at(i)) {
 597       return false;
 598     }
 599   }
 600   return true;
 601 }
 602 
 603 
 604 oop Universe::gen_out_of_memory_error(oop default_err) {
 605   // generate an out of memory error:
 606   // - if there is a preallocated error and stack traces are available
 607   //   (j.l.Throwable is initialized), then return the preallocated
 608   //   error with a filled in stack trace, and with the message
 609   //   provided by the default error.
 610   // - otherwise, return the default error, without a stack trace.
 611   int next;
 612   if ((_preallocated_out_of_memory_error_avail_count > 0) &&
 613       vmClasses::Throwable_klass()->is_initialized()) {
 614     next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
 615     assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
 616   } else {
 617     next = -1;
 618   }
 619   if (next < 0) {
 620     // all preallocated errors have been used.
 621     // return default
 622     return default_err;
 623   } else {
 624     JavaThread* current = JavaThread::current();
 625     Handle default_err_h(current, default_err);
 626     // get the error object at the slot and set set it to NULL so that the
 627     // array isn't keeping it alive anymore.
 628     Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next));
 629     assert(exc() != NULL, "slot has been used already");
 630     preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
 631 
 632     // use the message from the default error
 633     oop msg = java_lang_Throwable::message(default_err_h());
 634     assert(msg != NULL, "no message");
 635     java_lang_Throwable::set_message(exc(), msg);
 636 
 637     // populate the stack trace and return it.
 638     java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
 639     return exc();
 640   }
 641 }
 642 
 643 // Setup preallocated OutOfMemoryError errors
 644 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
 645   InstanceKlass* ik = vmClasses::OutOfMemoryError_klass();
 646   objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
 647   objArrayHandle oom_array(THREAD, oa);
 648 
 649   for (int i = 0; i < _oom_count; i++) {
 650     oop oom_obj = ik->allocate_instance(CHECK);
 651     oom_array->obj_at_put(i, oom_obj);
 652   }
 653   _out_of_memory_errors = OopHandle(vm_global(), oom_array());
 654 
 655   Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
 656   java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
 657 
 658   msg = java_lang_String::create_from_str("C heap space", CHECK);
 659   java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
 660 
 661   msg = java_lang_String::create_from_str("Metaspace", CHECK);
 662   java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
 663 
 664   msg = java_lang_String::create_from_str("Compressed class space", CHECK);
 665   java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
 666 
 667   msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
 668   java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
 669 
 670   msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
 671   java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
 672 
 673   msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
 674   java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
 675 
 676   msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK);
 677   java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg());
 678 
 679   // Setup the array of errors that have preallocated backtrace
 680   int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
 681   objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
 682   _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
 683   objArrayHandle preallocated_oom_array(THREAD, instance);
 684 
 685   for (int i=0; i<len; i++) {
 686     oop err = ik->allocate_instance(CHECK);
 687     Handle err_h(THREAD, err);
 688     java_lang_Throwable::allocate_backtrace(err_h, CHECK);
 689     preallocated_oom_array->obj_at_put(i, err_h());
 690   }
 691   _preallocated_out_of_memory_error_avail_count = (jint)len;
 692 }
 693 
 694 intptr_t Universe::_non_oop_bits = 0;
 695 
 696 void* Universe::non_oop_word() {
 697   // Neither the high bits nor the low bits of this value is allowed
 698   // to look like (respectively) the high or low bits of a real oop.
 699   //
 700   // High and low are CPU-specific notions, but low always includes
 701   // the low-order bit.  Since oops are always aligned at least mod 4,
 702   // setting the low-order bit will ensure that the low half of the
 703   // word will never look like that of a real oop.
 704   //
 705   // Using the OS-supplied non-memory-address word (usually 0 or -1)
 706   // will take care of the high bits, however many there are.
 707 
 708   if (_non_oop_bits == 0) {
 709     _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
 710   }
 711 
 712   return (void*)_non_oop_bits;
 713 }
 714 
 715 bool Universe::contains_non_oop_word(void* p) {
 716   return *(void**)p == non_oop_word();
 717 }
 718 
 719 static void initialize_global_behaviours() {
 720   CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour());
 721 }
 722 
 723 jint universe_init() {
 724   assert(!Universe::_fully_initialized, "called after initialize_vtables");
 725   guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
 726          "LogHeapWordSize is incorrect.");
 727   guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
 728   guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
 729             "oop size is not not a multiple of HeapWord size");
 730 
 731   TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
 732 
 733   initialize_global_behaviours();
 734 
 735   GCLogPrecious::initialize();
 736 
 737   GCConfig::arguments()->initialize_heap_sizes();
 738 
 739   jint status = Universe::initialize_heap();
 740   if (status != JNI_OK) {
 741     return status;
 742   }
 743 
 744   Universe::initialize_tlab();
 745 
 746   Metaspace::global_initialize();
 747 
 748   // Initialize performance counters for metaspaces
 749   MetaspaceCounters::initialize_performance_counters();
 750 
 751   // Checks 'AfterMemoryInit' constraints.
 752   if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) {
 753     return JNI_EINVAL;
 754   }
 755 
 756   // Create memory for metadata.  Must be after initializing heap for
 757   // DumpSharedSpaces.
 758   ClassLoaderData::init_null_class_loader_data();
 759 
 760   // We have a heap so create the Method* caches before
 761   // Metaspace::initialize_shared_spaces() tries to populate them.
 762   Universe::_finalizer_register_cache = new LatestMethodCache();
 763   Universe::_loader_addClass_cache    = new LatestMethodCache();
 764   Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
 765   Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
 766   Universe::_do_stack_walk_cache = new LatestMethodCache();
 767 
 768 #if INCLUDE_CDS
 769   DynamicArchive::check_for_dynamic_dump();
 770   if (UseSharedSpaces) {
 771     // Read the data structures supporting the shared spaces (shared
 772     // system dictionary, symbol table, etc.).  After that, access to
 773     // the file (other than the mapped regions) is no longer needed, and
 774     // the file is closed. Closing the file does not affect the
 775     // currently mapped regions.
 776     MetaspaceShared::initialize_shared_spaces();
 777     StringTable::create_table();
 778     if (HeapShared::is_loaded()) {
 779       StringTable::transfer_shared_strings_to_local_table();
 780     }
 781   } else
 782 #endif
 783   {
 784     SymbolTable::create_table();
 785     StringTable::create_table();
 786   }
 787 
 788 #if INCLUDE_CDS
 789   if (Arguments::is_dumping_archive()) {
 790     MetaspaceShared::prepare_for_dumping();
 791   }
 792 #endif
 793 
 794   if (strlen(VerifySubSet) > 0) {
 795     Universe::initialize_verify_flags();
 796   }
 797 
 798   ResolvedMethodTable::create_table();
 799 
 800   return JNI_OK;
 801 }
 802 
 803 jint Universe::initialize_heap() {
 804   assert(_collectedHeap == NULL, "Heap already created");
 805   _collectedHeap = GCConfig::arguments()->create_heap();
 806 
 807   log_info(gc)("Using %s", _collectedHeap->name());
 808   return _collectedHeap->initialize();
 809 }
 810 
 811 void Universe::initialize_tlab() {
 812   ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
 813   if (UseTLAB) {
 814     ThreadLocalAllocBuffer::startup_initialization();
 815   }
 816 }
 817 
 818 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
 819 
 820   assert(alignment <= Arguments::conservative_max_heap_alignment(),
 821          "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
 822          alignment, Arguments::conservative_max_heap_alignment());
 823 
 824   size_t total_reserved = align_up(heap_size, alignment);
 825   assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
 826       "heap size is too big for compressed oops");
 827 
 828   size_t page_size = os::vm_page_size();
 829   if (UseLargePages && is_aligned(alignment, os::large_page_size())) {
 830     page_size = os::large_page_size();
 831   } else {
 832     // Parallel is the only collector that might opt out of using large pages
 833     // for the heap.
 834     assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages");
 835   }
 836 
 837   // Now create the space.
 838   ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt);
 839 
 840   if (total_rs.is_reserved()) {
 841     assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
 842            "must be exactly of required size and alignment");
 843     // We are good.
 844 
 845     if (AllocateHeapAt != NULL) {
 846       log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
 847     }
 848 
 849     if (UseCompressedOops) {
 850       CompressedOops::initialize(total_rs);
 851     }
 852 
 853     Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
 854 
 855     return total_rs;
 856   }
 857 
 858   vm_exit_during_initialization(
 859     err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
 860             total_reserved/K));
 861 
 862   // satisfy compiler
 863   ShouldNotReachHere();
 864   return ReservedHeapSpace(0, 0, os::vm_page_size());
 865 }
 866 
 867 OopStorage* Universe::vm_weak() {
 868   return Universe::_vm_weak;
 869 }
 870 
 871 OopStorage* Universe::vm_global() {
 872   return Universe::_vm_global;
 873 }
 874 
 875 void Universe::oopstorage_init() {
 876   Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal);
 877   Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal);
 878 }
 879 
 880 void universe_oopstorage_init() {
 881   Universe::oopstorage_init();
 882 }
 883 
 884 void initialize_known_method(LatestMethodCache* method_cache,
 885                              InstanceKlass* ik,
 886                              const char* method,
 887                              Symbol* signature,
 888                              bool is_static, TRAPS)
 889 {
 890   TempNewSymbol name = SymbolTable::new_symbol(method);
 891   Method* m = NULL;
 892   // The klass must be linked before looking up the method.
 893   if (!ik->link_class_or_fail(THREAD) ||
 894       ((m = ik->find_method(name, signature)) == NULL) ||
 895       is_static != m->is_static()) {
 896     ResourceMark rm(THREAD);
 897     // NoSuchMethodException doesn't actually work because it tries to run the
 898     // <init> function before java_lang_Class is linked. Print error and exit.
 899     vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
 900                                  ik->name()->as_C_string(), method));
 901   }
 902   method_cache->init(ik, m);
 903 }
 904 
 905 void Universe::initialize_known_methods(TRAPS) {
 906   // Set up static method for registering finalizers
 907   initialize_known_method(_finalizer_register_cache,
 908                           vmClasses::Finalizer_klass(),
 909                           "register",
 910                           vmSymbols::object_void_signature(), true, CHECK);
 911 
 912   initialize_known_method(_throw_illegal_access_error_cache,
 913                           vmClasses::internal_Unsafe_klass(),
 914                           "throwIllegalAccessError",
 915                           vmSymbols::void_method_signature(), true, CHECK);
 916 
 917   initialize_known_method(_throw_no_such_method_error_cache,
 918                           vmClasses::internal_Unsafe_klass(),
 919                           "throwNoSuchMethodError",
 920                           vmSymbols::void_method_signature(), true, CHECK);
 921 
 922   // Set up method for registering loaded classes in class loader vector
 923   initialize_known_method(_loader_addClass_cache,
 924                           vmClasses::ClassLoader_klass(),
 925                           "addClass",
 926                           vmSymbols::class_void_signature(), false, CHECK);
 927 
 928   // Set up method for stack walking
 929   initialize_known_method(_do_stack_walk_cache,
 930                           vmClasses::AbstractStackWalker_klass(),
 931                           "doStackWalk",
 932                           vmSymbols::doStackWalk_signature(), false, CHECK);
 933 }
 934 
 935 void universe2_init() {
 936   EXCEPTION_MARK;
 937   Universe::genesis(CATCH);
 938 }
 939 
 940 // Set after initialization of the module runtime, call_initModuleRuntime
 941 void universe_post_module_init() {
 942   Universe::_module_initialized = true;
 943 }
 944 
 945 bool universe_post_init() {
 946   assert(!is_init_completed(), "Error: initialization not yet completed!");
 947   Universe::_fully_initialized = true;
 948   EXCEPTION_MARK;
 949   if (!UseSharedSpaces) {
 950     reinitialize_vtables();
 951     reinitialize_itables();
 952   }
 953 
 954   HandleMark hm(THREAD);
 955   // Setup preallocated empty java.lang.Class array for Method reflection.
 956 
 957   objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false);
 958   Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
 959 
 960   // Setup preallocated OutOfMemoryError errors
 961   Universe::create_preallocated_out_of_memory_errors(CHECK_false);
 962 
 963   oop instance;
 964   // Setup preallocated cause message for delayed StackOverflowError
 965   if (StackReservedPages > 0) {
 966     instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
 967     Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
 968   }
 969 
 970   // Setup preallocated NullPointerException
 971   // (this is currently used for a cheap & dirty solution in compiler exception handling)
 972   Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
 973   instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 974   Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance);
 975 
 976   // Setup preallocated ArithmeticException
 977   // (this is currently used for a cheap & dirty solution in compiler exception handling)
 978   k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
 979   instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 980   Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance);
 981 
 982   // Virtual Machine Error for when we get into a situation we can't resolve
 983   k = vmClasses::VirtualMachineError_klass();
 984   bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
 985   if (!linked) {
 986      tty->print_cr("Unable to link/verify VirtualMachineError class");
 987      return false; // initialization failed
 988   }
 989   instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 990   Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance);
 991 
 992   Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
 993   java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
 994 
 995   Universe::initialize_known_methods(CHECK_false);
 996 
 997   // This needs to be done before the first scavenge/gc, since
 998   // it's an input to soft ref clearing policy.
 999   {
1000     MutexLocker x(THREAD, Heap_lock);
1001     Universe::heap()->update_capacity_and_used_at_gc();
1002   }
1003 
1004   // ("weak") refs processing infrastructure initialization
1005   Universe::heap()->post_initialize();
1006 
1007   MemoryService::add_metaspace_memory_pools();
1008 
1009   MemoryService::set_universe_heap(Universe::heap());
1010 #if INCLUDE_CDS
1011   MetaspaceShared::post_initialize(CHECK_false);
1012 #endif
1013   return true;
1014 }
1015 
1016 
1017 void Universe::compute_base_vtable_size() {
1018   _base_vtable_size = ClassLoader::compute_Object_vtable();
1019 }
1020 
1021 void Universe::print_on(outputStream* st) {
1022   GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1023   st->print_cr("Heap");
1024   heap()->print_on(st);
1025 }
1026 
1027 void Universe::print_heap_at_SIGBREAK() {
1028   if (PrintHeapAtSIGBREAK) {
1029     print_on(tty);
1030     tty->cr();
1031     tty->flush();
1032   }
1033 }
1034 
1035 void Universe::initialize_verify_flags() {
1036   verify_flags = 0;
1037   const char delimiter[] = " ,";
1038 
1039   size_t length = strlen(VerifySubSet);
1040   char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1041   strncpy(subset_list, VerifySubSet, length + 1);
1042   char* save_ptr;
1043 
1044   char* token = strtok_r(subset_list, delimiter, &save_ptr);
1045   while (token != NULL) {
1046     if (strcmp(token, "threads") == 0) {
1047       verify_flags |= Verify_Threads;
1048     } else if (strcmp(token, "heap") == 0) {
1049       verify_flags |= Verify_Heap;
1050     } else if (strcmp(token, "symbol_table") == 0) {
1051       verify_flags |= Verify_SymbolTable;
1052     } else if (strcmp(token, "string_table") == 0) {
1053       verify_flags |= Verify_StringTable;
1054     } else if (strcmp(token, "codecache") == 0) {
1055       verify_flags |= Verify_CodeCache;
1056     } else if (strcmp(token, "dictionary") == 0) {
1057       verify_flags |= Verify_SystemDictionary;
1058     } else if (strcmp(token, "classloader_data_graph") == 0) {
1059       verify_flags |= Verify_ClassLoaderDataGraph;
1060     } else if (strcmp(token, "metaspace") == 0) {
1061       verify_flags |= Verify_MetaspaceUtils;
1062     } else if (strcmp(token, "jni_handles") == 0) {
1063       verify_flags |= Verify_JNIHandles;
1064     } else if (strcmp(token, "codecache_oops") == 0) {
1065       verify_flags |= Verify_CodeCacheOops;
1066     } else if (strcmp(token, "resolved_method_table") == 0) {
1067       verify_flags |= Verify_ResolvedMethodTable;
1068     } else if (strcmp(token, "stringdedup") == 0) {
1069       verify_flags |= Verify_StringDedup;
1070     } else {
1071       vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1072     }
1073     token = strtok_r(NULL, delimiter, &save_ptr);
1074   }
1075   FREE_C_HEAP_ARRAY(char, subset_list);
1076 }
1077 
1078 bool Universe::should_verify_subset(uint subset) {
1079   if (verify_flags & subset) {
1080     return true;
1081   }
1082   return false;
1083 }
1084 
1085 void Universe::verify(VerifyOption option, const char* prefix) {
1086   COMPILER2_PRESENT(
1087     assert(!DerivedPointerTable::is_active(),
1088          "DPT should not be active during verification "
1089          "(of thread stacks below)");
1090   )
1091 
1092   Thread* thread = Thread::current();
1093   ResourceMark rm(thread);
1094   HandleMark hm(thread);  // Handles created during verification can be zapped
1095   _verify_count++;
1096 
1097   FormatBuffer<> title("Verifying %s", prefix);
1098   GCTraceTime(Info, gc, verify) tm(title.buffer());
1099   if (should_verify_subset(Verify_Threads)) {
1100     log_debug(gc, verify)("Threads");
1101     Threads::verify();
1102   }
1103   if (should_verify_subset(Verify_Heap)) {
1104     log_debug(gc, verify)("Heap");
1105     heap()->verify(option);
1106   }
1107   if (should_verify_subset(Verify_SymbolTable)) {
1108     log_debug(gc, verify)("SymbolTable");
1109     SymbolTable::verify();
1110   }
1111   if (should_verify_subset(Verify_StringTable)) {
1112     log_debug(gc, verify)("StringTable");
1113     StringTable::verify();
1114   }
1115   if (should_verify_subset(Verify_CodeCache)) {
1116     log_debug(gc, verify)("CodeCache");
1117     CodeCache::verify();
1118   }
1119   if (should_verify_subset(Verify_SystemDictionary)) {
1120     log_debug(gc, verify)("SystemDictionary");
1121     SystemDictionary::verify();
1122   }
1123   if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1124     log_debug(gc, verify)("ClassLoaderDataGraph");
1125     ClassLoaderDataGraph::verify();
1126   }
1127   if (should_verify_subset(Verify_MetaspaceUtils)) {
1128     log_debug(gc, verify)("MetaspaceUtils");
1129     DEBUG_ONLY(MetaspaceUtils::verify();)
1130   }
1131   if (should_verify_subset(Verify_JNIHandles)) {
1132     log_debug(gc, verify)("JNIHandles");
1133     JNIHandles::verify();
1134   }
1135   if (should_verify_subset(Verify_CodeCacheOops)) {
1136     log_debug(gc, verify)("CodeCache Oops");
1137     CodeCache::verify_oops();
1138   }
1139   if (should_verify_subset(Verify_ResolvedMethodTable)) {
1140     log_debug(gc, verify)("ResolvedMethodTable Oops");
1141     ResolvedMethodTable::verify();
1142   }
1143   if (should_verify_subset(Verify_StringDedup)) {
1144     log_debug(gc, verify)("String Deduplication");
1145     StringDedup::verify();
1146   }
1147 }
1148 
1149 
1150 #ifndef PRODUCT
1151 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1152   assert(low_boundary < high_boundary, "bad interval");
1153 
1154   // decide which low-order bits we require to be clear:
1155   size_t alignSize = MinObjAlignmentInBytes;
1156   size_t min_object_size = CollectedHeap::min_fill_size();
1157 
1158   // make an inclusive limit:
1159   uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1160   uintptr_t min = (uintptr_t)low_boundary;
1161   assert(min < max, "bad interval");
1162   uintptr_t diff = max ^ min;
1163 
1164   // throw away enough low-order bits to make the diff vanish
1165   uintptr_t mask = (uintptr_t)(-1);
1166   while ((mask & diff) != 0)
1167     mask <<= 1;
1168   uintptr_t bits = (min & mask);
1169   assert(bits == (max & mask), "correct mask");
1170   // check an intermediate value between min and max, just to make sure:
1171   assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1172 
1173   // require address alignment, too:
1174   mask |= (alignSize - 1);
1175 
1176   if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1177     assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1178   }
1179   _verify_oop_mask = mask;
1180   _verify_oop_bits = bits;
1181 }
1182 
1183 // Oop verification (see MacroAssembler::verify_oop)
1184 
1185 uintptr_t Universe::verify_oop_mask() {
1186   return _verify_oop_mask;
1187 }
1188 
1189 uintptr_t Universe::verify_oop_bits() {
1190   return _verify_oop_bits;
1191 }
1192 
1193 uintptr_t Universe::verify_mark_mask() {
1194   return markWord::lock_mask_in_place;
1195 }
1196 
1197 uintptr_t Universe::verify_mark_bits() {
1198   intptr_t mask = verify_mark_mask();
1199   intptr_t bits = (intptr_t)markWord::prototype().value();
1200   assert((bits & ~mask) == 0, "no stray header bits");
1201   return bits;
1202 }
1203 #endif // PRODUCT
1204 
1205 
1206 void LatestMethodCache::init(Klass* k, Method* m) {
1207   if (!UseSharedSpaces) {
1208     _klass = k;
1209   }
1210 #ifndef PRODUCT
1211   else {
1212     // sharing initilization should have already set up _klass
1213     assert(_klass != NULL, "just checking");
1214   }
1215 #endif
1216 
1217   _method_idnum = m->method_idnum();
1218   assert(_method_idnum >= 0, "sanity check");
1219 }
1220 
1221 
1222 Method* LatestMethodCache::get_method() {
1223   if (klass() == NULL) return NULL;
1224   InstanceKlass* ik = InstanceKlass::cast(klass());
1225   Method* m = ik->method_with_idnum(method_idnum());
1226   assert(m != NULL, "sanity check");
1227   return m;
1228 }
1229 
1230 #ifdef ASSERT
1231 // Release dummy object(s) at bottom of heap
1232 bool Universe::release_fullgc_alot_dummy() {
1233   MutexLocker ml(FullGCALot_lock);
1234   objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1235   if (fullgc_alot_dummy_array != NULL) {
1236     if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1237       // No more dummies to release, release entire array instead
1238       _fullgc_alot_dummy_array.release(Universe::vm_global());
1239       return false;
1240     }
1241 
1242     // Release dummy at bottom of old generation
1243     fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1244   }
1245   return true;
1246 }
1247 
1248 bool Universe::is_gc_active() {
1249   return heap()->is_gc_active();
1250 }
1251 
1252 bool Universe::is_in_heap(const void* p) {
1253   return heap()->is_in(p);
1254 }
1255 
1256 #endif // ASSERT
--- EOF ---