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/heapShared.hpp"
  27 #include "cds/metaspaceShared.hpp"
  28 #include "classfile/classLoader.hpp"
  29 #include "classfile/classLoaderDataGraph.hpp"
  30 #include "classfile/javaClasses.hpp"
  31 #include "classfile/stringTable.hpp"
  32 #include "classfile/symbolTable.hpp"
  33 #include "classfile/systemDictionary.hpp"
  34 #include "classfile/vmClasses.hpp"
  35 #include "classfile/vmSymbols.hpp"
  36 #include "code/codeBehaviours.hpp"
  37 #include "code/codeCache.hpp"
  38 #include "compiler/oopMap.hpp"
  39 #include "gc/shared/collectedHeap.inline.hpp"
  40 #include "gc/shared/gcArguments.hpp"
  41 #include "gc/shared/gcConfig.hpp"
  42 #include "gc/shared/gcLogPrecious.hpp"
  43 #include "gc/shared/gcTraceTime.inline.hpp"
  44 #include "gc/shared/oopStorageSet.hpp"
  45 #include "gc/shared/stringdedup/stringDedup.hpp"
  46 #include "gc/shared/tlab_globals.hpp"
  47 #include "logging/log.hpp"
  48 #include "logging/logStream.hpp"
  49 #include "memory/metadataFactory.hpp"
  50 #include "memory/metaspaceClosure.hpp"
  51 #include "memory/metaspaceCounters.hpp"
  52 #include "memory/metaspaceUtils.hpp"
  53 #include "memory/oopFactory.hpp"
  54 #include "memory/resourceArea.hpp"
  55 #include "memory/universe.hpp"
  56 #include "oops/compressedOops.hpp"
  57 #include "oops/instanceKlass.hpp"
  58 #include "oops/instanceMirrorKlass.hpp"
  59 #include "oops/klass.inline.hpp"
  60 #include "oops/objArrayOop.inline.hpp"
  61 #include "oops/oop.inline.hpp"
  62 #include "oops/oopHandle.inline.hpp"
  63 #include "oops/typeArrayKlass.hpp"
  64 #include "prims/resolvedMethodTable.hpp"
  65 #include "runtime/arguments.hpp"
  66 #include "runtime/atomic.hpp"
  67 #include "runtime/flags/jvmFlagLimit.hpp"
  68 #include "runtime/handles.inline.hpp"
  69 #include "runtime/init.hpp"
  70 #include "runtime/java.hpp"
  71 #include "runtime/jniHandles.hpp"
  72 #include "runtime/thread.inline.hpp"
  73 #include "runtime/timerTrace.hpp"
  74 #include "services/memoryService.hpp"
  75 #include "utilities/align.hpp"
  76 #include "utilities/autoRestore.hpp"
  77 #include "utilities/debug.hpp"
  78 #include "utilities/formatBuffer.hpp"
  79 #include "utilities/macros.hpp"
  80 #include "utilities/ostream.hpp"
  81 #include "utilities/preserveException.hpp"
  82 
  83 // Known objects
  84 Klass* Universe::_typeArrayKlassObjs[T_LONG+1]        = { NULL /*, NULL...*/ };
  85 Klass* Universe::_objectArrayKlassObj                 = NULL;
  86 OopHandle Universe::_mirrors[T_VOID+1];
  87 
  88 OopHandle Universe::_main_thread_group;
  89 OopHandle Universe::_system_thread_group;
  90 OopHandle Universe::_the_empty_class_array;
  91 OopHandle Universe::_the_null_string;
  92 OopHandle Universe::_the_min_jint_string;
  93 
  94 OopHandle Universe::_the_null_sentinel;
  95 
  96 // _out_of_memory_errors is an objArray
  97 enum OutOfMemoryInstance { _oom_java_heap,
  98                            _oom_c_heap,
  99                            _oom_metaspace,
 100                            _oom_class_metaspace,
 101                            _oom_array_size,
 102                            _oom_gc_overhead_limit,
 103                            _oom_realloc_objects,
 104                            _oom_retry,
 105                            _oom_count };
 106 
 107 OopHandle Universe::_out_of_memory_errors;
 108 OopHandle Universe::_delayed_stack_overflow_error_message;
 109 OopHandle Universe::_preallocated_out_of_memory_error_array;
 110 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
 111 
 112 OopHandle Universe::_null_ptr_exception_instance;
 113 OopHandle Universe::_arithmetic_exception_instance;
 114 OopHandle Universe::_virtual_machine_error_instance;
 115 
 116 OopHandle Universe::_reference_pending_list;
 117 
 118 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
 119 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
 120 LatestMethodCache* Universe::_loader_addClass_cache    = NULL;
 121 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
 122 LatestMethodCache* Universe::_throw_no_such_method_error_cache = NULL;
 123 LatestMethodCache* Universe::_do_stack_walk_cache     = NULL;
 124 
 125 long Universe::verify_flags                           = Universe::Verify_All;
 126 
 127 Array<int>* Universe::_the_empty_int_array            = NULL;
 128 Array<u2>* Universe::_the_empty_short_array           = NULL;
 129 Array<Klass*>* Universe::_the_empty_klass_array     = NULL;
 130 Array<InstanceKlass*>* Universe::_the_empty_instance_klass_array  = NULL;
 131 Array<Method*>* Universe::_the_empty_method_array   = NULL;
 132 
 133 // These variables are guarded by FullGCALot_lock.
 134 debug_only(OopHandle Universe::_fullgc_alot_dummy_array;)
 135 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
 136 
 137 // Heap
 138 int             Universe::_verify_count = 0;
 139 
 140 // Oop verification (see MacroAssembler::verify_oop)
 141 uintptr_t       Universe::_verify_oop_mask = 0;
 142 uintptr_t       Universe::_verify_oop_bits = (uintptr_t) -1;
 143 
 144 int             Universe::_base_vtable_size = 0;
 145 bool            Universe::_bootstrapping = false;
 146 bool            Universe::_module_initialized = false;
 147 bool            Universe::_fully_initialized = false;
 148 
 149 OopStorage*     Universe::_vm_weak = NULL;
 150 OopStorage*     Universe::_vm_global = NULL;
 151 
 152 CollectedHeap*  Universe::_collectedHeap = NULL;
 153 
 154 objArrayOop Universe::the_empty_class_array ()  {
 155   return (objArrayOop)_the_empty_class_array.resolve();
 156 }
 157 
 158 oop Universe::main_thread_group()                 { return _main_thread_group.resolve(); }
 159 void Universe::set_main_thread_group(oop group)   { _main_thread_group = OopHandle(vm_global(), group); }
 160 
 161 oop Universe::system_thread_group()               { return _system_thread_group.resolve(); }
 162 void Universe::set_system_thread_group(oop group) { _system_thread_group = OopHandle(vm_global(), group); }
 163 
 164 oop Universe::the_null_string()                   { return _the_null_string.resolve(); }
 165 oop Universe::the_min_jint_string()               { return _the_min_jint_string.resolve(); }
 166 
 167 oop Universe::null_ptr_exception_instance()       { return _null_ptr_exception_instance.resolve(); }
 168 oop Universe::arithmetic_exception_instance()     { return _arithmetic_exception_instance.resolve(); }
 169 oop Universe::virtual_machine_error_instance()    { return _virtual_machine_error_instance.resolve(); }
 170 
 171 oop Universe::the_null_sentinel()                 { return _the_null_sentinel.resolve(); }
 172 
 173 oop Universe::int_mirror()                        { return check_mirror(_mirrors[T_INT].resolve()); }
 174 oop Universe::float_mirror()                      { return check_mirror(_mirrors[T_FLOAT].resolve()); }
 175 oop Universe::double_mirror()                     { return check_mirror(_mirrors[T_DOUBLE].resolve()); }
 176 oop Universe::byte_mirror()                       { return check_mirror(_mirrors[T_BYTE].resolve()); }
 177 oop Universe::bool_mirror()                       { return check_mirror(_mirrors[T_BOOLEAN].resolve()); }
 178 oop Universe::char_mirror()                       { return check_mirror(_mirrors[T_CHAR].resolve()); }
 179 oop Universe::long_mirror()                       { return check_mirror(_mirrors[T_LONG].resolve()); }
 180 oop Universe::short_mirror()                      { return check_mirror(_mirrors[T_SHORT].resolve()); }
 181 oop Universe::void_mirror()                       { return check_mirror(_mirrors[T_VOID].resolve()); }
 182 
 183 oop Universe::java_mirror(BasicType t) {
 184   assert((uint)t < T_VOID+1, "range check");
 185   return check_mirror(_mirrors[t].resolve());
 186 }
 187 
 188 // Used by CDS dumping
 189 void Universe::replace_mirror(BasicType t, oop new_mirror) {
 190   Universe::_mirrors[t].replace(new_mirror);
 191 }
 192 
 193 void Universe::basic_type_classes_do(void f(Klass*)) {
 194   for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
 195     f(_typeArrayKlassObjs[i]);
 196   }
 197 }
 198 
 199 void Universe::basic_type_classes_do(KlassClosure *closure) {
 200   for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
 201     closure->do_klass(_typeArrayKlassObjs[i]);
 202   }
 203 }
 204 
 205 void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
 206   it->push(&_klass);
 207 }
 208 
 209 void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
 210   for (int i = 0; i < T_LONG+1; i++) {
 211     it->push(&_typeArrayKlassObjs[i]);
 212   }
 213   it->push(&_objectArrayKlassObj);
 214 
 215   it->push(&_the_empty_int_array);
 216   it->push(&_the_empty_short_array);
 217   it->push(&_the_empty_klass_array);
 218   it->push(&_the_empty_instance_klass_array);
 219   it->push(&_the_empty_method_array);
 220   it->push(&_the_array_interfaces_array);
 221 
 222   _finalizer_register_cache->metaspace_pointers_do(it);
 223   _loader_addClass_cache->metaspace_pointers_do(it);
 224   _throw_illegal_access_error_cache->metaspace_pointers_do(it);
 225   _throw_no_such_method_error_cache->metaspace_pointers_do(it);
 226   _do_stack_walk_cache->metaspace_pointers_do(it);
 227 }
 228 
 229 // Serialize metadata and pointers to primitive type mirrors in and out of CDS archive
 230 void Universe::serialize(SerializeClosure* f) {
 231 
 232 #if INCLUDE_CDS_JAVA_HEAP
 233   {
 234     oop mirror_oop;
 235     for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
 236       if (f->reading()) {
 237         f->do_oop(&mirror_oop); // read from archive
 238         assert(oopDesc::is_oop_or_null(mirror_oop), "is oop");
 239         // Only create an OopHandle for non-null mirrors
 240         if (mirror_oop != NULL) {
 241           _mirrors[i] = OopHandle(vm_global(), mirror_oop);
 242         }
 243       } else {
 244         if (HeapShared::can_write()) {
 245           mirror_oop = _mirrors[i].resolve();
 246         } else {
 247           mirror_oop = NULL;
 248         }
 249         f->do_oop(&mirror_oop); // write to archive
 250       }
 251       if (mirror_oop != NULL) { // may be null if archived heap is disabled
 252         java_lang_Class::update_archived_primitive_mirror_native_pointers(mirror_oop);
 253       }
 254     }
 255   }
 256 #endif
 257 
 258   for (int i = 0; i < T_LONG+1; i++) {
 259     f->do_ptr((void**)&_typeArrayKlassObjs[i]);
 260   }
 261 
 262   f->do_ptr((void**)&_objectArrayKlassObj);
 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 
 277 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
 278   if (size < alignment || size % alignment != 0) {
 279     vm_exit_during_initialization(
 280       err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
 281   }
 282 }
 283 
 284 void initialize_basic_type_klass(Klass* k, TRAPS) {
 285   Klass* ok = vmClasses::Object_klass();
 286 #if INCLUDE_CDS
 287   if (UseSharedSpaces) {
 288     ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
 289     assert(k->super() == ok, "u3");
 290     if (k->is_instance_klass()) {
 291       InstanceKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), NULL, CHECK);
 292     } else {
 293       ArrayKlass::cast(k)->restore_unshareable_info(loader_data, Handle(), CHECK);
 294     }
 295   } else
 296 #endif
 297   {
 298     k->initialize_supers(ok, NULL, CHECK);
 299   }
 300   k->append_to_sibling_list();
 301 }
 302 
 303 void Universe::genesis(TRAPS) {
 304   ResourceMark rm(THREAD);
 305   HandleMark   hm(THREAD);
 306 
 307   { AutoModifyRestore<bool> temporarily(_bootstrapping, true);
 308 
 309     { MutexLocker mc(THREAD, Compile_lock);
 310 
 311       java_lang_Class::allocate_fixup_lists();
 312 
 313       // determine base vtable size; without that we cannot create the array klasses
 314       compute_base_vtable_size();
 315 
 316       if (!UseSharedSpaces) {
 317         for (int i = T_BOOLEAN; i < T_LONG+1; i++) {
 318           _typeArrayKlassObjs[i] = TypeArrayKlass::create_klass((BasicType)i, CHECK);
 319         }
 320 
 321         ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
 322 
 323         _the_array_interfaces_array     = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
 324         _the_empty_int_array            = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
 325         _the_empty_short_array          = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
 326         _the_empty_method_array         = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
 327         _the_empty_klass_array          = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
 328         _the_empty_instance_klass_array = MetadataFactory::new_array<InstanceKlass*>(null_cld, 0, CHECK);
 329       }
 330     }
 331 
 332     vmSymbols::initialize();
 333 
 334     SystemDictionary::initialize(CHECK);
 335 
 336     // Create string constants
 337     oop s = StringTable::intern("null", CHECK);
 338     _the_null_string = OopHandle(vm_global(), s);
 339     s = StringTable::intern("-2147483648", CHECK);
 340     _the_min_jint_string = OopHandle(vm_global(), s);
 341 
 342 
 343 #if INCLUDE_CDS
 344     if (UseSharedSpaces) {
 345       // Verify shared interfaces array.
 346       assert(_the_array_interfaces_array->at(0) ==
 347              vmClasses::Cloneable_klass(), "u3");
 348       assert(_the_array_interfaces_array->at(1) ==
 349              vmClasses::Serializable_klass(), "u3");
 350     } else
 351 #endif
 352     {
 353       // Set up shared interfaces array.  (Do this before supers are set up.)
 354       _the_array_interfaces_array->at_put(0, vmClasses::Cloneable_klass());
 355       _the_array_interfaces_array->at_put(1, vmClasses::Serializable_klass());
 356     }
 357 
 358     initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
 359     initialize_basic_type_klass(charArrayKlassObj(), CHECK);
 360     initialize_basic_type_klass(floatArrayKlassObj(), CHECK);
 361     initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
 362     initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
 363     initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
 364     initialize_basic_type_klass(intArrayKlassObj(), CHECK);
 365     initialize_basic_type_klass(longArrayKlassObj(), CHECK);
 366   } // end of core bootstrapping
 367 
 368   {
 369     Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
 370     _the_null_sentinel = OopHandle(vm_global(), tns());
 371   }
 372 
 373   // Create a handle for reference_pending_list
 374   _reference_pending_list = OopHandle(vm_global(), NULL);
 375 
 376   // Maybe this could be lifted up now that object array can be initialized
 377   // during the bootstrapping.
 378 
 379   // OLD
 380   // Initialize _objectArrayKlass after core bootstraping to make
 381   // sure the super class is set up properly for _objectArrayKlass.
 382   // ---
 383   // NEW
 384   // Since some of the old system object arrays have been converted to
 385   // ordinary object arrays, _objectArrayKlass will be loaded when
 386   // SystemDictionary::initialize(CHECK); is run. See the extra check
 387   // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
 388   _objectArrayKlassObj = InstanceKlass::
 389     cast(vmClasses::Object_klass())->array_klass(1, CHECK);
 390   // OLD
 391   // Add the class to the class hierarchy manually to make sure that
 392   // its vtable is initialized after core bootstrapping is completed.
 393   // ---
 394   // New
 395   // Have already been initialized.
 396   _objectArrayKlassObj->append_to_sibling_list();
 397 
 398   #ifdef ASSERT
 399   if (FullGCALot) {
 400     // Allocate an array of dummy objects.
 401     // We'd like these to be at the bottom of the old generation,
 402     // so that when we free one and then collect,
 403     // (almost) the whole heap moves
 404     // and we find out if we actually update all the oops correctly.
 405     // But we can't allocate directly in the old generation,
 406     // so we allocate wherever, and hope that the first collection
 407     // moves these objects to the bottom of the old generation.
 408     int size = FullGCALotDummies * 2;
 409 
 410     objArrayOop    naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK);
 411     objArrayHandle dummy_array(THREAD, naked_array);
 412     int i = 0;
 413     while (i < size) {
 414         // Allocate dummy in old generation
 415       oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK);
 416       dummy_array->obj_at_put(i++, dummy);
 417     }
 418     {
 419       // Only modify the global variable inside the mutex.
 420       // If we had a race to here, the other dummy_array instances
 421       // and their elements just get dropped on the floor, which is fine.
 422       MutexLocker ml(THREAD, FullGCALot_lock);
 423       if (_fullgc_alot_dummy_array.is_empty()) {
 424         _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
 425       }
 426     }
 427     assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
 428   }
 429   #endif
 430 }
 431 
 432 void Universe::initialize_basic_type_mirrors(TRAPS) {
 433 #if INCLUDE_CDS_JAVA_HEAP
 434     if (UseSharedSpaces &&
 435         HeapShared::are_archived_mirrors_available() &&
 436         _mirrors[T_INT].resolve() != NULL) {
 437       assert(HeapShared::can_use(), "Sanity");
 438 
 439       // check that all mirrors are mapped also
 440       for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
 441         if (!is_reference_type((BasicType)i)) {
 442           oop m = _mirrors[i].resolve();
 443           assert(m != NULL, "archived mirrors should not be NULL");
 444         }
 445       }
 446     } else
 447       // _mirror[T_INT} could be NULL if archived heap is not mapped.
 448 #endif
 449     {
 450       for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
 451         BasicType bt = (BasicType)i;
 452         if (!is_reference_type(bt)) {
 453           oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
 454           _mirrors[i] = OopHandle(vm_global(), m);
 455         }
 456       }
 457     }
 458 }
 459 
 460 void Universe::fixup_mirrors(TRAPS) {
 461   // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
 462   // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
 463   // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
 464   // that the number of objects allocated at this point is very small.
 465   assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded");
 466   HandleMark hm(THREAD);
 467 
 468   if (!UseSharedSpaces) {
 469     // Cache the start of the static fields
 470     InstanceMirrorKlass::init_offset_of_static_fields();
 471   }
 472 
 473   GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
 474   int list_length = list->length();
 475   for (int i = 0; i < list_length; i++) {
 476     Klass* k = list->at(i);
 477     assert(k->is_klass(), "List should only hold classes");
 478     java_lang_Class::fixup_mirror(k, CATCH);
 479   }
 480   delete java_lang_Class::fixup_mirror_list();
 481   java_lang_Class::set_fixup_mirror_list(NULL);
 482 }
 483 
 484 #define assert_pll_locked(test) \
 485   assert(Heap_lock->test(), "Reference pending list access requires lock")
 486 
 487 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
 488 
 489 oop Universe::reference_pending_list() {
 490   if (Thread::current()->is_VM_thread()) {
 491     assert_pll_locked(is_locked);
 492   } else {
 493     assert_pll_ownership();
 494   }
 495   return _reference_pending_list.resolve();
 496 }
 497 
 498 void Universe::clear_reference_pending_list() {
 499   assert_pll_ownership();
 500   _reference_pending_list.replace(NULL);
 501 }
 502 
 503 bool Universe::has_reference_pending_list() {
 504   assert_pll_ownership();
 505   return _reference_pending_list.peek() != NULL;
 506 }
 507 
 508 oop Universe::swap_reference_pending_list(oop list) {
 509   assert_pll_locked(is_locked);
 510   return _reference_pending_list.xchg(list);
 511 }
 512 
 513 #undef assert_pll_locked
 514 #undef assert_pll_ownership
 515 
 516 static void reinitialize_vtables() {
 517   // The vtables are initialized by starting at java.lang.Object and
 518   // initializing through the subclass links, so that the super
 519   // classes are always initialized first.
 520   for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
 521     Klass* sub = iter.klass();
 522     sub->vtable().initialize_vtable();
 523   }
 524 }
 525 
 526 static void reinitialize_itables() {
 527 
 528   class ReinitTableClosure : public KlassClosure {
 529    public:
 530     void do_klass(Klass* k) {
 531       if (k->is_instance_klass()) {
 532          InstanceKlass::cast(k)->itable().initialize_itable();
 533       }
 534     }
 535   };
 536 
 537   MutexLocker mcld(ClassLoaderDataGraph_lock);
 538   ReinitTableClosure cl;
 539   ClassLoaderDataGraph::classes_do(&cl);
 540 }
 541 
 542 
 543 bool Universe::on_page_boundary(void* addr) {
 544   return is_aligned(addr, os::vm_page_size());
 545 }
 546 
 547 // the array of preallocated errors with backtraces
 548 objArrayOop Universe::preallocated_out_of_memory_errors() {
 549   return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
 550 }
 551 
 552 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
 553 
 554 oop Universe::out_of_memory_error_java_heap() {
 555   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
 556 }
 557 
 558 oop Universe::out_of_memory_error_c_heap() {
 559   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
 560 }
 561 
 562 oop Universe::out_of_memory_error_metaspace() {
 563   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
 564 }
 565 
 566 oop Universe::out_of_memory_error_class_metaspace() {
 567   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
 568 }
 569 
 570 oop Universe::out_of_memory_error_array_size() {
 571   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
 572 }
 573 
 574 oop Universe::out_of_memory_error_gc_overhead_limit() {
 575   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
 576 }
 577 
 578 oop Universe::out_of_memory_error_realloc_objects() {
 579   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
 580 }
 581 
 582 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM
 583 oop Universe::out_of_memory_error_retry()              { return out_of_memory_errors()->obj_at(_oom_retry);  }
 584 oop Universe::delayed_stack_overflow_error_message()   { return _delayed_stack_overflow_error_message.resolve(); }
 585 
 586 
 587 bool Universe::should_fill_in_stack_trace(Handle throwable) {
 588   // never attempt to fill in the stack trace of preallocated errors that do not have
 589   // backtrace. These errors are kept alive forever and may be "re-used" when all
 590   // preallocated errors with backtrace have been consumed. Also need to avoid
 591   // a potential loop which could happen if an out of memory occurs when attempting
 592   // to allocate the backtrace.
 593   objArrayOop preallocated_oom = out_of_memory_errors();
 594   for (int i = 0; i < _oom_count; i++) {
 595     if (throwable() == preallocated_oom->obj_at(i)) {
 596       return false;
 597     }
 598   }
 599   return true;
 600 }
 601 
 602 
 603 oop Universe::gen_out_of_memory_error(oop default_err) {
 604   // generate an out of memory error:
 605   // - if there is a preallocated error and stack traces are available
 606   //   (j.l.Throwable is initialized), then return the preallocated
 607   //   error with a filled in stack trace, and with the message
 608   //   provided by the default error.
 609   // - otherwise, return the default error, without a stack trace.
 610   int next;
 611   if ((_preallocated_out_of_memory_error_avail_count > 0) &&
 612       vmClasses::Throwable_klass()->is_initialized()) {
 613     next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
 614     assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
 615   } else {
 616     next = -1;
 617   }
 618   if (next < 0) {
 619     // all preallocated errors have been used.
 620     // return default
 621     return default_err;
 622   } else {
 623     JavaThread* current = JavaThread::current();
 624     Handle default_err_h(current, default_err);
 625     // get the error object at the slot and set set it to NULL so that the
 626     // array isn't keeping it alive anymore.
 627     Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next));
 628     assert(exc() != NULL, "slot has been used already");
 629     preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
 630 
 631     // use the message from the default error
 632     oop msg = java_lang_Throwable::message(default_err_h());
 633     assert(msg != NULL, "no message");
 634     java_lang_Throwable::set_message(exc(), msg);
 635 
 636     // populate the stack trace and return it.
 637     java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
 638     return exc();
 639   }
 640 }
 641 
 642 // Setup preallocated OutOfMemoryError errors
 643 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
 644   InstanceKlass* ik = vmClasses::OutOfMemoryError_klass();
 645   objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
 646   objArrayHandle oom_array(THREAD, oa);
 647 
 648   for (int i = 0; i < _oom_count; i++) {
 649     oop oom_obj = ik->allocate_instance(CHECK);
 650     oom_array->obj_at_put(i, oom_obj);
 651   }
 652   _out_of_memory_errors = OopHandle(vm_global(), oom_array());
 653 
 654   Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
 655   java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
 656 
 657   msg = java_lang_String::create_from_str("C heap space", CHECK);
 658   java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
 659 
 660   msg = java_lang_String::create_from_str("Metaspace", CHECK);
 661   java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
 662 
 663   msg = java_lang_String::create_from_str("Compressed class space", CHECK);
 664   java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
 665 
 666   msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
 667   java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
 668 
 669   msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
 670   java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
 671 
 672   msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
 673   java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
 674 
 675   msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK);
 676   java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg());
 677 
 678   // Setup the array of errors that have preallocated backtrace
 679   int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
 680   objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
 681   _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
 682   objArrayHandle preallocated_oom_array(THREAD, instance);
 683 
 684   for (int i=0; i<len; i++) {
 685     oop err = ik->allocate_instance(CHECK);
 686     Handle err_h(THREAD, err);
 687     java_lang_Throwable::allocate_backtrace(err_h, CHECK);
 688     preallocated_oom_array->obj_at_put(i, err_h());
 689   }
 690   _preallocated_out_of_memory_error_avail_count = (jint)len;
 691 }
 692 
 693 intptr_t Universe::_non_oop_bits = 0;
 694 
 695 void* Universe::non_oop_word() {
 696   // Neither the high bits nor the low bits of this value is allowed
 697   // to look like (respectively) the high or low bits of a real oop.
 698   //
 699   // High and low are CPU-specific notions, but low always includes
 700   // the low-order bit.  Since oops are always aligned at least mod 4,
 701   // setting the low-order bit will ensure that the low half of the
 702   // word will never look like that of a real oop.
 703   //
 704   // Using the OS-supplied non-memory-address word (usually 0 or -1)
 705   // will take care of the high bits, however many there are.
 706 
 707   if (_non_oop_bits == 0) {
 708     _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
 709   }
 710 
 711   return (void*)_non_oop_bits;
 712 }
 713 
 714 bool Universe::contains_non_oop_word(void* p) {
 715   return *(void**)p == non_oop_word();
 716 }
 717 
 718 static void initialize_global_behaviours() {
 719   CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour());
 720 }
 721 
 722 jint universe_init() {
 723   assert(!Universe::_fully_initialized, "called after initialize_vtables");
 724   guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
 725          "LogHeapWordSize is incorrect.");
 726   guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
 727   guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
 728             "oop size is not not a multiple of HeapWord size");
 729 
 730   TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
 731 
 732   initialize_global_behaviours();
 733 
 734   GCLogPrecious::initialize();
 735 
 736   GCConfig::arguments()->initialize_heap_sizes();
 737 
 738   jint status = Universe::initialize_heap();
 739   if (status != JNI_OK) {
 740     return status;
 741   }
 742 
 743   Universe::initialize_tlab();
 744 
 745   Metaspace::global_initialize();
 746 
 747   // Initialize performance counters for metaspaces
 748   MetaspaceCounters::initialize_performance_counters();
 749 
 750   // Checks 'AfterMemoryInit' constraints.
 751   if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) {
 752     return JNI_EINVAL;
 753   }
 754 
 755   // Create memory for metadata.  Must be after initializing heap for
 756   // DumpSharedSpaces.
 757   ClassLoaderData::init_null_class_loader_data();
 758 
 759   // We have a heap so create the Method* caches before
 760   // Metaspace::initialize_shared_spaces() tries to populate them.
 761   Universe::_finalizer_register_cache = new LatestMethodCache();
 762   Universe::_loader_addClass_cache    = new LatestMethodCache();
 763   Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
 764   Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
 765   Universe::_do_stack_walk_cache = new LatestMethodCache();
 766 
 767 #if INCLUDE_CDS
 768   if (UseSharedSpaces) {
 769     // Read the data structures supporting the shared spaces (shared
 770     // system dictionary, symbol table, etc.).  After that, access to
 771     // the file (other than the mapped regions) is no longer needed, and
 772     // the file is closed. Closing the file does not affect the
 773     // currently mapped regions.
 774     MetaspaceShared::initialize_shared_spaces();
 775     StringTable::create_table();
 776     if (HeapShared::is_loaded()) {
 777       StringTable::transfer_shared_strings_to_local_table();
 778     }
 779   } else
 780 #endif
 781   {
 782     SymbolTable::create_table();
 783     StringTable::create_table();
 784   }
 785 
 786 #if INCLUDE_CDS
 787   if (Arguments::is_dumping_archive()) {
 788     MetaspaceShared::prepare_for_dumping();
 789   }
 790 #endif
 791 
 792   if (strlen(VerifySubSet) > 0) {
 793     Universe::initialize_verify_flags();
 794   }
 795 
 796   ResolvedMethodTable::create_table();
 797 
 798   return JNI_OK;
 799 }
 800 
 801 jint Universe::initialize_heap() {
 802   assert(_collectedHeap == NULL, "Heap already created");
 803   _collectedHeap = GCConfig::arguments()->create_heap();
 804 
 805   log_info(gc)("Using %s", _collectedHeap->name());
 806   return _collectedHeap->initialize();
 807 }
 808 
 809 void Universe::initialize_tlab() {
 810   ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
 811   if (UseTLAB) {
 812     ThreadLocalAllocBuffer::startup_initialization();
 813   }
 814 }
 815 
 816 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
 817 
 818   assert(alignment <= Arguments::conservative_max_heap_alignment(),
 819          "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
 820          alignment, Arguments::conservative_max_heap_alignment());
 821 
 822   size_t total_reserved = align_up(heap_size, alignment);
 823   assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
 824       "heap size is too big for compressed oops");
 825 
 826   size_t page_size = os::vm_page_size();
 827   if (UseLargePages && is_aligned(alignment, os::large_page_size())) {
 828     page_size = os::large_page_size();
 829   } else {
 830     // Parallel is the only collector that might opt out of using large pages
 831     // for the heap.
 832     assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages");
 833   }
 834 
 835   // Now create the space.
 836   ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt);
 837 
 838   if (total_rs.is_reserved()) {
 839     assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
 840            "must be exactly of required size and alignment");
 841     // We are good.
 842 
 843     if (AllocateHeapAt != NULL) {
 844       log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
 845     }
 846 
 847     if (UseCompressedOops) {
 848       CompressedOops::initialize(total_rs);
 849     }
 850 
 851     Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
 852 
 853     return total_rs;
 854   }
 855 
 856   vm_exit_during_initialization(
 857     err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
 858             total_reserved/K));
 859 
 860   // satisfy compiler
 861   ShouldNotReachHere();
 862   return ReservedHeapSpace(0, 0, os::vm_page_size());
 863 }
 864 
 865 OopStorage* Universe::vm_weak() {
 866   return Universe::_vm_weak;
 867 }
 868 
 869 OopStorage* Universe::vm_global() {
 870   return Universe::_vm_global;
 871 }
 872 
 873 void Universe::oopstorage_init() {
 874   Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal);
 875   Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal);
 876 }
 877 
 878 void universe_oopstorage_init() {
 879   Universe::oopstorage_init();
 880 }
 881 
 882 void initialize_known_method(LatestMethodCache* method_cache,
 883                              InstanceKlass* ik,
 884                              const char* method,
 885                              Symbol* signature,
 886                              bool is_static, TRAPS)
 887 {
 888   TempNewSymbol name = SymbolTable::new_symbol(method);
 889   Method* m = NULL;
 890   // The klass must be linked before looking up the method.
 891   if (!ik->link_class_or_fail(THREAD) ||
 892       ((m = ik->find_method(name, signature)) == NULL) ||
 893       is_static != m->is_static()) {
 894     ResourceMark rm(THREAD);
 895     // NoSuchMethodException doesn't actually work because it tries to run the
 896     // <init> function before java_lang_Class is linked. Print error and exit.
 897     vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
 898                                  ik->name()->as_C_string(), method));
 899   }
 900   method_cache->init(ik, m);
 901 }
 902 
 903 void Universe::initialize_known_methods(TRAPS) {
 904   // Set up static method for registering finalizers
 905   initialize_known_method(_finalizer_register_cache,
 906                           vmClasses::Finalizer_klass(),
 907                           "register",
 908                           vmSymbols::object_void_signature(), true, CHECK);
 909 
 910   initialize_known_method(_throw_illegal_access_error_cache,
 911                           vmClasses::internal_Unsafe_klass(),
 912                           "throwIllegalAccessError",
 913                           vmSymbols::void_method_signature(), true, CHECK);
 914 
 915   initialize_known_method(_throw_no_such_method_error_cache,
 916                           vmClasses::internal_Unsafe_klass(),
 917                           "throwNoSuchMethodError",
 918                           vmSymbols::void_method_signature(), true, CHECK);
 919 
 920   // Set up method for registering loaded classes in class loader vector
 921   initialize_known_method(_loader_addClass_cache,
 922                           vmClasses::ClassLoader_klass(),
 923                           "addClass",
 924                           vmSymbols::class_void_signature(), false, CHECK);
 925 
 926   // Set up method for stack walking
 927   initialize_known_method(_do_stack_walk_cache,
 928                           vmClasses::AbstractStackWalker_klass(),
 929                           "doStackWalk",
 930                           vmSymbols::doStackWalk_signature(), false, CHECK);
 931 }
 932 
 933 void universe2_init() {
 934   EXCEPTION_MARK;
 935   Universe::genesis(CATCH);
 936 }
 937 
 938 // Set after initialization of the module runtime, call_initModuleRuntime
 939 void universe_post_module_init() {
 940   Universe::_module_initialized = true;
 941 }
 942 
 943 bool universe_post_init() {
 944   assert(!is_init_completed(), "Error: initialization not yet completed!");
 945   Universe::_fully_initialized = true;
 946   EXCEPTION_MARK;
 947   if (!UseSharedSpaces) {
 948     reinitialize_vtables();
 949     reinitialize_itables();
 950   }
 951 
 952   HandleMark hm(THREAD);
 953   // Setup preallocated empty java.lang.Class array for Method reflection.
 954 
 955   objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false);
 956   Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
 957 
 958   // Setup preallocated OutOfMemoryError errors
 959   Universe::create_preallocated_out_of_memory_errors(CHECK_false);
 960 
 961   oop instance;
 962   // Setup preallocated cause message for delayed StackOverflowError
 963   if (StackReservedPages > 0) {
 964     instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
 965     Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
 966   }
 967 
 968   // Setup preallocated NullPointerException
 969   // (this is currently used for a cheap & dirty solution in compiler exception handling)
 970   Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
 971   instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 972   Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance);
 973 
 974   // Setup preallocated ArithmeticException
 975   // (this is currently used for a cheap & dirty solution in compiler exception handling)
 976   k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
 977   instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 978   Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance);
 979 
 980   // Virtual Machine Error for when we get into a situation we can't resolve
 981   k = vmClasses::VirtualMachineError_klass();
 982   bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
 983   if (!linked) {
 984      tty->print_cr("Unable to link/verify VirtualMachineError class");
 985      return false; // initialization failed
 986   }
 987   instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 988   Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance);
 989 
 990   Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
 991   java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
 992 
 993   Universe::initialize_known_methods(CHECK_false);
 994 
 995   // This needs to be done before the first scavenge/gc, since
 996   // it's an input to soft ref clearing policy.
 997   {
 998     MutexLocker x(THREAD, Heap_lock);
 999     Universe::heap()->update_capacity_and_used_at_gc();
1000   }
1001 
1002   // ("weak") refs processing infrastructure initialization
1003   Universe::heap()->post_initialize();
1004 
1005   MemoryService::add_metaspace_memory_pools();
1006 
1007   MemoryService::set_universe_heap(Universe::heap());
1008 #if INCLUDE_CDS
1009   MetaspaceShared::post_initialize(CHECK_false);
1010 #endif
1011   return true;
1012 }
1013 
1014 
1015 void Universe::compute_base_vtable_size() {
1016   _base_vtable_size = ClassLoader::compute_Object_vtable();
1017 }
1018 
1019 void Universe::print_on(outputStream* st) {
1020   GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1021   st->print_cr("Heap");
1022   heap()->print_on(st);
1023 }
1024 
1025 void Universe::print_heap_at_SIGBREAK() {
1026   if (PrintHeapAtSIGBREAK) {
1027     print_on(tty);
1028     tty->cr();
1029     tty->flush();
1030   }
1031 }
1032 
1033 void Universe::initialize_verify_flags() {
1034   verify_flags = 0;
1035   const char delimiter[] = " ,";
1036 
1037   size_t length = strlen(VerifySubSet);
1038   char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1039   strncpy(subset_list, VerifySubSet, length + 1);
1040   char* save_ptr;
1041 
1042   char* token = strtok_r(subset_list, delimiter, &save_ptr);
1043   while (token != NULL) {
1044     if (strcmp(token, "threads") == 0) {
1045       verify_flags |= Verify_Threads;
1046     } else if (strcmp(token, "heap") == 0) {
1047       verify_flags |= Verify_Heap;
1048     } else if (strcmp(token, "symbol_table") == 0) {
1049       verify_flags |= Verify_SymbolTable;
1050     } else if (strcmp(token, "string_table") == 0) {
1051       verify_flags |= Verify_StringTable;
1052     } else if (strcmp(token, "codecache") == 0) {
1053       verify_flags |= Verify_CodeCache;
1054     } else if (strcmp(token, "dictionary") == 0) {
1055       verify_flags |= Verify_SystemDictionary;
1056     } else if (strcmp(token, "classloader_data_graph") == 0) {
1057       verify_flags |= Verify_ClassLoaderDataGraph;
1058     } else if (strcmp(token, "metaspace") == 0) {
1059       verify_flags |= Verify_MetaspaceUtils;
1060     } else if (strcmp(token, "jni_handles") == 0) {
1061       verify_flags |= Verify_JNIHandles;
1062     } else if (strcmp(token, "codecache_oops") == 0) {
1063       verify_flags |= Verify_CodeCacheOops;
1064     } else if (strcmp(token, "resolved_method_table") == 0) {
1065       verify_flags |= Verify_ResolvedMethodTable;
1066     } else if (strcmp(token, "stringdedup") == 0) {
1067       verify_flags |= Verify_StringDedup;
1068     } else {
1069       vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1070     }
1071     token = strtok_r(NULL, delimiter, &save_ptr);
1072   }
1073   FREE_C_HEAP_ARRAY(char, subset_list);
1074 }
1075 
1076 bool Universe::should_verify_subset(uint subset) {
1077   if (verify_flags & subset) {
1078     return true;
1079   }
1080   return false;
1081 }
1082 
1083 void Universe::verify(VerifyOption option, const char* prefix) {
1084   COMPILER2_PRESENT(
1085     assert(!DerivedPointerTable::is_active(),
1086          "DPT should not be active during verification "
1087          "(of thread stacks below)");
1088   )
1089 
1090   Thread* thread = Thread::current();
1091   ResourceMark rm(thread);
1092   HandleMark hm(thread);  // Handles created during verification can be zapped
1093   _verify_count++;
1094 
1095   FormatBuffer<> title("Verifying %s", prefix);
1096   GCTraceTime(Info, gc, verify) tm(title.buffer());
1097   if (should_verify_subset(Verify_Threads)) {
1098     log_debug(gc, verify)("Threads");
1099     Threads::verify();
1100   }
1101   if (should_verify_subset(Verify_Heap)) {
1102     log_debug(gc, verify)("Heap");
1103     heap()->verify(option);
1104   }
1105   if (should_verify_subset(Verify_SymbolTable)) {
1106     log_debug(gc, verify)("SymbolTable");
1107     SymbolTable::verify();
1108   }
1109   if (should_verify_subset(Verify_StringTable)) {
1110     log_debug(gc, verify)("StringTable");
1111     StringTable::verify();
1112   }
1113   if (should_verify_subset(Verify_CodeCache)) {
1114     log_debug(gc, verify)("CodeCache");
1115     CodeCache::verify();
1116   }
1117   if (should_verify_subset(Verify_SystemDictionary)) {
1118     log_debug(gc, verify)("SystemDictionary");
1119     SystemDictionary::verify();
1120   }
1121   if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1122     log_debug(gc, verify)("ClassLoaderDataGraph");
1123     ClassLoaderDataGraph::verify();
1124   }
1125   if (should_verify_subset(Verify_MetaspaceUtils)) {
1126     log_debug(gc, verify)("MetaspaceUtils");
1127     DEBUG_ONLY(MetaspaceUtils::verify();)
1128   }
1129   if (should_verify_subset(Verify_JNIHandles)) {
1130     log_debug(gc, verify)("JNIHandles");
1131     JNIHandles::verify();
1132   }
1133   if (should_verify_subset(Verify_CodeCacheOops)) {
1134     log_debug(gc, verify)("CodeCache Oops");
1135     CodeCache::verify_oops();
1136   }
1137   if (should_verify_subset(Verify_ResolvedMethodTable)) {
1138     log_debug(gc, verify)("ResolvedMethodTable Oops");
1139     ResolvedMethodTable::verify();
1140   }
1141   if (should_verify_subset(Verify_StringDedup)) {
1142     log_debug(gc, verify)("String Deduplication");
1143     StringDedup::verify();
1144   }
1145 }
1146 
1147 
1148 #ifndef PRODUCT
1149 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1150   assert(low_boundary < high_boundary, "bad interval");
1151 
1152   // decide which low-order bits we require to be clear:
1153   size_t alignSize = MinObjAlignmentInBytes;
1154   size_t min_object_size = CollectedHeap::min_fill_size();
1155 
1156   // make an inclusive limit:
1157   uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1158   uintptr_t min = (uintptr_t)low_boundary;
1159   assert(min < max, "bad interval");
1160   uintptr_t diff = max ^ min;
1161 
1162   // throw away enough low-order bits to make the diff vanish
1163   uintptr_t mask = (uintptr_t)(-1);
1164   while ((mask & diff) != 0)
1165     mask <<= 1;
1166   uintptr_t bits = (min & mask);
1167   assert(bits == (max & mask), "correct mask");
1168   // check an intermediate value between min and max, just to make sure:
1169   assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1170 
1171   // require address alignment, too:
1172   mask |= (alignSize - 1);
1173 
1174   if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1175     assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1176   }
1177   _verify_oop_mask = mask;
1178   _verify_oop_bits = bits;
1179 }
1180 
1181 // Oop verification (see MacroAssembler::verify_oop)
1182 
1183 uintptr_t Universe::verify_oop_mask() {
1184   return _verify_oop_mask;
1185 }
1186 
1187 uintptr_t Universe::verify_oop_bits() {
1188   return _verify_oop_bits;
1189 }
1190 
1191 uintptr_t Universe::verify_mark_mask() {
1192   return markWord::lock_mask_in_place;
1193 }
1194 
1195 uintptr_t Universe::verify_mark_bits() {
1196   intptr_t mask = verify_mark_mask();
1197   intptr_t bits = (intptr_t)markWord::prototype().value();
1198   assert((bits & ~mask) == 0, "no stray header bits");
1199   return bits;
1200 }
1201 #endif // PRODUCT
1202 
1203 
1204 void LatestMethodCache::init(Klass* k, Method* m) {
1205   if (!UseSharedSpaces) {
1206     _klass = k;
1207   }
1208 #ifndef PRODUCT
1209   else {
1210     // sharing initilization should have already set up _klass
1211     assert(_klass != NULL, "just checking");
1212   }
1213 #endif
1214 
1215   _method_idnum = m->method_idnum();
1216   assert(_method_idnum >= 0, "sanity check");
1217 }
1218 
1219 
1220 Method* LatestMethodCache::get_method() {
1221   if (klass() == NULL) return NULL;
1222   InstanceKlass* ik = InstanceKlass::cast(klass());
1223   Method* m = ik->method_with_idnum(method_idnum());
1224   assert(m != NULL, "sanity check");
1225   return m;
1226 }
1227 
1228 #ifdef ASSERT
1229 // Release dummy object(s) at bottom of heap
1230 bool Universe::release_fullgc_alot_dummy() {
1231   MutexLocker ml(FullGCALot_lock);
1232   objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1233   if (fullgc_alot_dummy_array != NULL) {
1234     if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1235       // No more dummies to release, release entire array instead
1236       _fullgc_alot_dummy_array.release(Universe::vm_global());
1237       return false;
1238     }
1239 
1240     // Release dummy at bottom of old generation
1241     fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1242   }
1243   return true;
1244 }
1245 
1246 bool Universe::is_gc_active() {
1247   return heap()->is_gc_active();
1248 }
1249 
1250 bool Universe::is_in_heap(const void* p) {
1251   return heap()->is_in(p);
1252 }
1253 
1254 #endif // ASSERT