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/instanceStackChunkKlass.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 
 368     InstanceStackChunkKlass::init_offset_of_stack();
 369   } // end of core bootstrapping
 370 
 371   {
 372     Handle tns = java_lang_String::create_from_str("<null_sentinel>", CHECK);
 373     _the_null_sentinel = OopHandle(vm_global(), tns());
 374   }
 375 
 376   // Create a handle for reference_pending_list
 377   _reference_pending_list = OopHandle(vm_global(), NULL);
 378 
 379   // Maybe this could be lifted up now that object array can be initialized
 380   // during the bootstrapping.
 381 
 382   // OLD
 383   // Initialize _objectArrayKlass after core bootstraping to make
 384   // sure the super class is set up properly for _objectArrayKlass.
 385   // ---
 386   // NEW
 387   // Since some of the old system object arrays have been converted to
 388   // ordinary object arrays, _objectArrayKlass will be loaded when
 389   // SystemDictionary::initialize(CHECK); is run. See the extra check
 390   // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
 391   _objectArrayKlassObj = InstanceKlass::
 392     cast(vmClasses::Object_klass())->array_klass(1, CHECK);
 393   // OLD
 394   // Add the class to the class hierarchy manually to make sure that
 395   // its vtable is initialized after core bootstrapping is completed.
 396   // ---
 397   // New
 398   // Have already been initialized.
 399   _objectArrayKlassObj->append_to_sibling_list();
 400 
 401   #ifdef ASSERT
 402   if (FullGCALot) {
 403     // Allocate an array of dummy objects.
 404     // We'd like these to be at the bottom of the old generation,
 405     // so that when we free one and then collect,
 406     // (almost) the whole heap moves
 407     // and we find out if we actually update all the oops correctly.
 408     // But we can't allocate directly in the old generation,
 409     // so we allocate wherever, and hope that the first collection
 410     // moves these objects to the bottom of the old generation.
 411     int size = FullGCALotDummies * 2;
 412 
 413     objArrayOop    naked_array = oopFactory::new_objArray(vmClasses::Object_klass(), size, CHECK);
 414     objArrayHandle dummy_array(THREAD, naked_array);
 415     int i = 0;
 416     while (i < size) {
 417         // Allocate dummy in old generation
 418       oop dummy = vmClasses::Object_klass()->allocate_instance(CHECK);
 419       dummy_array->obj_at_put(i++, dummy);
 420     }
 421     {
 422       // Only modify the global variable inside the mutex.
 423       // If we had a race to here, the other dummy_array instances
 424       // and their elements just get dropped on the floor, which is fine.
 425       MutexLocker ml(THREAD, FullGCALot_lock);
 426       if (_fullgc_alot_dummy_array.is_empty()) {
 427         _fullgc_alot_dummy_array = OopHandle(vm_global(), dummy_array());
 428       }
 429     }
 430     assert(i == ((objArrayOop)_fullgc_alot_dummy_array.resolve())->length(), "just checking");
 431   }
 432   #endif
 433 }
 434 
 435 void Universe::initialize_basic_type_mirrors(TRAPS) {
 436 #if INCLUDE_CDS_JAVA_HEAP
 437     if (UseSharedSpaces &&
 438         HeapShared::are_archived_mirrors_available() &&
 439         _mirrors[T_INT].resolve() != NULL) {
 440       assert(HeapShared::can_use(), "Sanity");
 441 
 442       // check that all mirrors are mapped also
 443       for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
 444         if (!is_reference_type((BasicType)i)) {
 445           oop m = _mirrors[i].resolve();
 446           assert(m != NULL, "archived mirrors should not be NULL");
 447         }
 448       }
 449     } else
 450       // _mirror[T_INT} could be NULL if archived heap is not mapped.
 451 #endif
 452     {
 453       for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
 454         BasicType bt = (BasicType)i;
 455         if (!is_reference_type(bt)) {
 456           oop m = java_lang_Class::create_basic_type_mirror(type2name(bt), bt, CHECK);
 457           _mirrors[i] = OopHandle(vm_global(), m);
 458         }
 459       }
 460     }
 461 }
 462 
 463 void Universe::fixup_mirrors(TRAPS) {
 464   // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
 465   // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
 466   // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
 467   // that the number of objects allocated at this point is very small.
 468   assert(vmClasses::Class_klass_loaded(), "java.lang.Class should be loaded");
 469   HandleMark hm(THREAD);
 470 
 471   if (!UseSharedSpaces) {
 472     // Cache the start of the static fields
 473     InstanceMirrorKlass::init_offset_of_static_fields();
 474   }
 475 
 476   GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
 477   int list_length = list->length();
 478   for (int i = 0; i < list_length; i++) {
 479     Klass* k = list->at(i);
 480     assert(k->is_klass(), "List should only hold classes");
 481     java_lang_Class::fixup_mirror(k, CATCH);
 482   }
 483   delete java_lang_Class::fixup_mirror_list();
 484   java_lang_Class::set_fixup_mirror_list(NULL);
 485 }
 486 
 487 #define assert_pll_locked(test) \
 488   assert(Heap_lock->test(), "Reference pending list access requires lock")
 489 
 490 #define assert_pll_ownership() assert_pll_locked(owned_by_self)
 491 
 492 oop Universe::reference_pending_list() {
 493   if (Thread::current()->is_VM_thread()) {
 494     assert_pll_locked(is_locked);
 495   } else {
 496     assert_pll_ownership();
 497   }
 498   return _reference_pending_list.resolve();
 499 }
 500 
 501 void Universe::clear_reference_pending_list() {
 502   assert_pll_ownership();
 503   _reference_pending_list.replace(NULL);
 504 }
 505 
 506 bool Universe::has_reference_pending_list() {
 507   assert_pll_ownership();
 508   return _reference_pending_list.peek() != NULL;
 509 }
 510 
 511 oop Universe::swap_reference_pending_list(oop list) {
 512   assert_pll_locked(is_locked);
 513   return _reference_pending_list.xchg(list);
 514 }
 515 
 516 #undef assert_pll_locked
 517 #undef assert_pll_ownership
 518 
 519 static void reinitialize_vtables() {
 520   // The vtables are initialized by starting at java.lang.Object and
 521   // initializing through the subclass links, so that the super
 522   // classes are always initialized first.
 523   for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
 524     Klass* sub = iter.klass();
 525     sub->vtable().initialize_vtable();
 526   }
 527 }
 528 
 529 static void reinitialize_itables() {
 530 
 531   class ReinitTableClosure : public KlassClosure {
 532    public:
 533     void do_klass(Klass* k) {
 534       if (k->is_instance_klass()) {
 535          InstanceKlass::cast(k)->itable().initialize_itable();
 536       }
 537     }
 538   };
 539 
 540   MutexLocker mcld(ClassLoaderDataGraph_lock);
 541   ReinitTableClosure cl;
 542   ClassLoaderDataGraph::classes_do(&cl);
 543 }
 544 
 545 
 546 bool Universe::on_page_boundary(void* addr) {
 547   return is_aligned(addr, os::vm_page_size());
 548 }
 549 
 550 // the array of preallocated errors with backtraces
 551 objArrayOop Universe::preallocated_out_of_memory_errors() {
 552   return (objArrayOop)_preallocated_out_of_memory_error_array.resolve();
 553 }
 554 
 555 objArrayOop Universe::out_of_memory_errors() { return (objArrayOop)_out_of_memory_errors.resolve(); }
 556 
 557 oop Universe::out_of_memory_error_java_heap() {
 558   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_java_heap));
 559 }
 560 
 561 oop Universe::out_of_memory_error_c_heap() {
 562   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_c_heap));
 563 }
 564 
 565 oop Universe::out_of_memory_error_metaspace() {
 566   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_metaspace));
 567 }
 568 
 569 oop Universe::out_of_memory_error_class_metaspace() {
 570   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_class_metaspace));
 571 }
 572 
 573 oop Universe::out_of_memory_error_array_size() {
 574   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_array_size));
 575 }
 576 
 577 oop Universe::out_of_memory_error_gc_overhead_limit() {
 578   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
 579 }
 580 
 581 oop Universe::out_of_memory_error_realloc_objects() {
 582   return gen_out_of_memory_error(out_of_memory_errors()->obj_at(_oom_realloc_objects));
 583 }
 584 
 585 // Throw default _out_of_memory_error_retry object as it will never propagate out of the VM
 586 oop Universe::out_of_memory_error_retry()              { return out_of_memory_errors()->obj_at(_oom_retry);  }
 587 oop Universe::delayed_stack_overflow_error_message()   { return _delayed_stack_overflow_error_message.resolve(); }
 588 
 589 
 590 bool Universe::should_fill_in_stack_trace(Handle throwable) {
 591   // never attempt to fill in the stack trace of preallocated errors that do not have
 592   // backtrace. These errors are kept alive forever and may be "re-used" when all
 593   // preallocated errors with backtrace have been consumed. Also need to avoid
 594   // a potential loop which could happen if an out of memory occurs when attempting
 595   // to allocate the backtrace.
 596   objArrayOop preallocated_oom = out_of_memory_errors();
 597   for (int i = 0; i < _oom_count; i++) {
 598     if (throwable() == preallocated_oom->obj_at(i)) {
 599       return false;
 600     }
 601   }
 602   return true;
 603 }
 604 
 605 
 606 oop Universe::gen_out_of_memory_error(oop default_err) {
 607   // generate an out of memory error:
 608   // - if there is a preallocated error and stack traces are available
 609   //   (j.l.Throwable is initialized), then return the preallocated
 610   //   error with a filled in stack trace, and with the message
 611   //   provided by the default error.
 612   // - otherwise, return the default error, without a stack trace.
 613   int next;
 614   if ((_preallocated_out_of_memory_error_avail_count > 0) &&
 615       vmClasses::Throwable_klass()->is_initialized()) {
 616     next = (int)Atomic::add(&_preallocated_out_of_memory_error_avail_count, -1);
 617     assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
 618   } else {
 619     next = -1;
 620   }
 621   if (next < 0) {
 622     // all preallocated errors have been used.
 623     // return default
 624     return default_err;
 625   } else {
 626     JavaThread* current = JavaThread::current();
 627     Handle default_err_h(current, default_err);
 628     // get the error object at the slot and set set it to NULL so that the
 629     // array isn't keeping it alive anymore.
 630     Handle exc(current, preallocated_out_of_memory_errors()->obj_at(next));
 631     assert(exc() != NULL, "slot has been used already");
 632     preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
 633 
 634     // use the message from the default error
 635     oop msg = java_lang_Throwable::message(default_err_h());
 636     assert(msg != NULL, "no message");
 637     java_lang_Throwable::set_message(exc(), msg);
 638 
 639     // populate the stack trace and return it.
 640     java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
 641     return exc();
 642   }
 643 }
 644 
 645 // Setup preallocated OutOfMemoryError errors
 646 void Universe::create_preallocated_out_of_memory_errors(TRAPS) {
 647   InstanceKlass* ik = vmClasses::OutOfMemoryError_klass();
 648   objArrayOop oa = oopFactory::new_objArray(ik, _oom_count, CHECK);
 649   objArrayHandle oom_array(THREAD, oa);
 650 
 651   for (int i = 0; i < _oom_count; i++) {
 652     oop oom_obj = ik->allocate_instance(CHECK);
 653     oom_array->obj_at_put(i, oom_obj);
 654   }
 655   _out_of_memory_errors = OopHandle(vm_global(), oom_array());
 656 
 657   Handle msg = java_lang_String::create_from_str("Java heap space", CHECK);
 658   java_lang_Throwable::set_message(oom_array->obj_at(_oom_java_heap), msg());
 659 
 660   msg = java_lang_String::create_from_str("C heap space", CHECK);
 661   java_lang_Throwable::set_message(oom_array->obj_at(_oom_c_heap), msg());
 662 
 663   msg = java_lang_String::create_from_str("Metaspace", CHECK);
 664   java_lang_Throwable::set_message(oom_array->obj_at(_oom_metaspace), msg());
 665 
 666   msg = java_lang_String::create_from_str("Compressed class space", CHECK);
 667   java_lang_Throwable::set_message(oom_array->obj_at(_oom_class_metaspace), msg());
 668 
 669   msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK);
 670   java_lang_Throwable::set_message(oom_array->obj_at(_oom_array_size), msg());
 671 
 672   msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK);
 673   java_lang_Throwable::set_message(oom_array->obj_at(_oom_gc_overhead_limit), msg());
 674 
 675   msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK);
 676   java_lang_Throwable::set_message(oom_array->obj_at(_oom_realloc_objects), msg());
 677 
 678   msg = java_lang_String::create_from_str("Java heap space: failed retryable allocation", CHECK);
 679   java_lang_Throwable::set_message(oom_array->obj_at(_oom_retry), msg());
 680 
 681   // Setup the array of errors that have preallocated backtrace
 682   int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
 683   objArrayOop instance = oopFactory::new_objArray(ik, len, CHECK);
 684   _preallocated_out_of_memory_error_array = OopHandle(vm_global(), instance);
 685   objArrayHandle preallocated_oom_array(THREAD, instance);
 686 
 687   for (int i=0; i<len; i++) {
 688     oop err = ik->allocate_instance(CHECK);
 689     Handle err_h(THREAD, err);
 690     java_lang_Throwable::allocate_backtrace(err_h, CHECK);
 691     preallocated_oom_array->obj_at_put(i, err_h());
 692   }
 693   _preallocated_out_of_memory_error_avail_count = (jint)len;
 694 }
 695 
 696 intptr_t Universe::_non_oop_bits = 0;
 697 
 698 void* Universe::non_oop_word() {
 699   // Neither the high bits nor the low bits of this value is allowed
 700   // to look like (respectively) the high or low bits of a real oop.
 701   //
 702   // High and low are CPU-specific notions, but low always includes
 703   // the low-order bit.  Since oops are always aligned at least mod 4,
 704   // setting the low-order bit will ensure that the low half of the
 705   // word will never look like that of a real oop.
 706   //
 707   // Using the OS-supplied non-memory-address word (usually 0 or -1)
 708   // will take care of the high bits, however many there are.
 709 
 710   if (_non_oop_bits == 0) {
 711     _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
 712   }
 713 
 714   return (void*)_non_oop_bits;
 715 }
 716 
 717 bool Universe::contains_non_oop_word(void* p) {
 718   return *(void**)p == non_oop_word();
 719 }
 720 
 721 static void initialize_global_behaviours() {
 722   CompiledICProtectionBehaviour::set_current(new DefaultICProtectionBehaviour());
 723 }
 724 
 725 jint universe_init() {
 726   assert(!Universe::_fully_initialized, "called after initialize_vtables");
 727   guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
 728          "LogHeapWordSize is incorrect.");
 729   guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
 730   guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
 731             "oop size is not not a multiple of HeapWord size");
 732 
 733   TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
 734 
 735   initialize_global_behaviours();
 736 
 737   GCLogPrecious::initialize();
 738 
 739   GCConfig::arguments()->initialize_heap_sizes();
 740 
 741   jint status = Universe::initialize_heap();
 742   if (status != JNI_OK) {
 743     return status;
 744   }
 745 
 746   Universe::initialize_tlab();
 747 
 748   Metaspace::global_initialize();
 749 
 750   // Initialize performance counters for metaspaces
 751   MetaspaceCounters::initialize_performance_counters();
 752 
 753   // Checks 'AfterMemoryInit' constraints.
 754   if (!JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterMemoryInit)) {
 755     return JNI_EINVAL;
 756   }
 757 
 758   // Create memory for metadata.  Must be after initializing heap for
 759   // DumpSharedSpaces.
 760   ClassLoaderData::init_null_class_loader_data();
 761 
 762   // We have a heap so create the Method* caches before
 763   // Metaspace::initialize_shared_spaces() tries to populate them.
 764   Universe::_finalizer_register_cache = new LatestMethodCache();
 765   Universe::_loader_addClass_cache    = new LatestMethodCache();
 766   Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
 767   Universe::_throw_no_such_method_error_cache = new LatestMethodCache();
 768   Universe::_do_stack_walk_cache = new LatestMethodCache();
 769 
 770 #if INCLUDE_CDS
 771   if (UseSharedSpaces) {
 772     // Read the data structures supporting the shared spaces (shared
 773     // system dictionary, symbol table, etc.).  After that, access to
 774     // the file (other than the mapped regions) is no longer needed, and
 775     // the file is closed. Closing the file does not affect the
 776     // currently mapped regions.
 777     MetaspaceShared::initialize_shared_spaces();
 778     StringTable::create_table();
 779     if (HeapShared::is_loaded()) {
 780       StringTable::transfer_shared_strings_to_local_table();
 781     }
 782   } else
 783 #endif
 784   {
 785     SymbolTable::create_table();
 786     StringTable::create_table();
 787   }
 788 
 789 #if INCLUDE_CDS
 790   if (Arguments::is_dumping_archive()) {
 791     MetaspaceShared::prepare_for_dumping();
 792   }
 793 #endif
 794 
 795   if (strlen(VerifySubSet) > 0) {
 796     Universe::initialize_verify_flags();
 797   }
 798 
 799   ResolvedMethodTable::create_table();
 800 
 801   return JNI_OK;
 802 }
 803 
 804 jint Universe::initialize_heap() {
 805   assert(_collectedHeap == NULL, "Heap already created");
 806   _collectedHeap = GCConfig::arguments()->create_heap();
 807 
 808   log_info(gc)("Using %s", _collectedHeap->name());
 809   return _collectedHeap->initialize();
 810 }
 811 
 812 void Universe::initialize_tlab() {
 813   ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
 814   if (UseTLAB) {
 815     ThreadLocalAllocBuffer::startup_initialization();
 816   }
 817 }
 818 
 819 ReservedHeapSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
 820 
 821   assert(alignment <= Arguments::conservative_max_heap_alignment(),
 822          "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
 823          alignment, Arguments::conservative_max_heap_alignment());
 824 
 825   size_t total_reserved = align_up(heap_size, alignment);
 826   assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
 827       "heap size is too big for compressed oops");
 828 
 829   size_t page_size = os::vm_page_size();
 830   if (UseLargePages && is_aligned(alignment, os::large_page_size())) {
 831     page_size = os::large_page_size();
 832   } else {
 833     // Parallel is the only collector that might opt out of using large pages
 834     // for the heap.
 835     assert(!UseLargePages || UseParallelGC , "Wrong alignment to use large pages");
 836   }
 837 
 838   // Now create the space.
 839   ReservedHeapSpace total_rs(total_reserved, alignment, page_size, AllocateHeapAt);
 840 
 841   if (total_rs.is_reserved()) {
 842     assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
 843            "must be exactly of required size and alignment");
 844     // We are good.
 845 
 846     if (AllocateHeapAt != NULL) {
 847       log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
 848     }
 849 
 850     if (UseCompressedOops) {
 851       CompressedOops::initialize(total_rs);
 852     }
 853 
 854     Universe::calculate_verify_data((HeapWord*)total_rs.base(), (HeapWord*)total_rs.end());
 855 
 856     return total_rs;
 857   }
 858 
 859   vm_exit_during_initialization(
 860     err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
 861             total_reserved/K));
 862 
 863   // satisfy compiler
 864   ShouldNotReachHere();
 865   return ReservedHeapSpace(0, 0, os::vm_page_size());
 866 }
 867 
 868 OopStorage* Universe::vm_weak() {
 869   return Universe::_vm_weak;
 870 }
 871 
 872 OopStorage* Universe::vm_global() {
 873   return Universe::_vm_global;
 874 }
 875 
 876 void Universe::oopstorage_init() {
 877   Universe::_vm_global = OopStorageSet::create_strong("VM Global", mtInternal);
 878   Universe::_vm_weak = OopStorageSet::create_weak("VM Weak", mtInternal);
 879 }
 880 
 881 void universe_oopstorage_init() {
 882   Universe::oopstorage_init();
 883 }
 884 
 885 void initialize_known_method(LatestMethodCache* method_cache,
 886                              InstanceKlass* ik,
 887                              const char* method,
 888                              Symbol* signature,
 889                              bool is_static, TRAPS)
 890 {
 891   TempNewSymbol name = SymbolTable::new_symbol(method);
 892   Method* m = NULL;
 893   // The klass must be linked before looking up the method.
 894   if (!ik->link_class_or_fail(THREAD) ||
 895       ((m = ik->find_method(name, signature)) == NULL) ||
 896       is_static != m->is_static()) {
 897     ResourceMark rm(THREAD);
 898     // NoSuchMethodException doesn't actually work because it tries to run the
 899     // <init> function before java_lang_Class is linked. Print error and exit.
 900     vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
 901                                  ik->name()->as_C_string(), method));
 902   }
 903   method_cache->init(ik, m);
 904 }
 905 
 906 void Universe::initialize_known_methods(TRAPS) {
 907   // Set up static method for registering finalizers
 908   initialize_known_method(_finalizer_register_cache,
 909                           vmClasses::Finalizer_klass(),
 910                           "register",
 911                           vmSymbols::object_void_signature(), true, CHECK);
 912 
 913   initialize_known_method(_throw_illegal_access_error_cache,
 914                           vmClasses::internal_Unsafe_klass(),
 915                           "throwIllegalAccessError",
 916                           vmSymbols::void_method_signature(), true, CHECK);
 917 
 918   initialize_known_method(_throw_no_such_method_error_cache,
 919                           vmClasses::internal_Unsafe_klass(),
 920                           "throwNoSuchMethodError",
 921                           vmSymbols::void_method_signature(), true, CHECK);
 922 
 923   // Set up method for registering loaded classes in class loader vector
 924   initialize_known_method(_loader_addClass_cache,
 925                           vmClasses::ClassLoader_klass(),
 926                           "addClass",
 927                           vmSymbols::class_void_signature(), false, CHECK);
 928 
 929   // Set up method for stack walking
 930   initialize_known_method(_do_stack_walk_cache,
 931                           vmClasses::AbstractStackWalker_klass(),
 932                           "doStackWalk",
 933                           vmSymbols::doStackWalk_signature(), false, CHECK);
 934 }
 935 
 936 void universe2_init() {
 937   EXCEPTION_MARK;
 938   Universe::genesis(CATCH);
 939 }
 940 
 941 // Set after initialization of the module runtime, call_initModuleRuntime
 942 void universe_post_module_init() {
 943   Universe::_module_initialized = true;
 944 }
 945 
 946 bool universe_post_init() {
 947   assert(!is_init_completed(), "Error: initialization not yet completed!");
 948   Universe::_fully_initialized = true;
 949   EXCEPTION_MARK;
 950   if (!UseSharedSpaces) {
 951     reinitialize_vtables();
 952     reinitialize_itables();
 953   }
 954 
 955   HandleMark hm(THREAD);
 956   // Setup preallocated empty java.lang.Class array for Method reflection.
 957 
 958   objArrayOop the_empty_class_array = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_false);
 959   Universe::_the_empty_class_array = OopHandle(Universe::vm_global(), the_empty_class_array);
 960 
 961   // Setup preallocated OutOfMemoryError errors
 962   Universe::create_preallocated_out_of_memory_errors(CHECK_false);
 963 
 964   oop instance;
 965   // Setup preallocated cause message for delayed StackOverflowError
 966   if (StackReservedPages > 0) {
 967     instance = java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
 968     Universe::_delayed_stack_overflow_error_message = OopHandle(Universe::vm_global(), instance);
 969   }
 970 
 971   // Setup preallocated NullPointerException
 972   // (this is currently used for a cheap & dirty solution in compiler exception handling)
 973   Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
 974   instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 975   Universe::_null_ptr_exception_instance = OopHandle(Universe::vm_global(), instance);
 976 
 977   // Setup preallocated ArithmeticException
 978   // (this is currently used for a cheap & dirty solution in compiler exception handling)
 979   k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
 980   instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 981   Universe::_arithmetic_exception_instance = OopHandle(Universe::vm_global(), instance);
 982 
 983   // Virtual Machine Error for when we get into a situation we can't resolve
 984   k = vmClasses::VirtualMachineError_klass();
 985   bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
 986   if (!linked) {
 987      tty->print_cr("Unable to link/verify VirtualMachineError class");
 988      return false; // initialization failed
 989   }
 990   instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
 991   Universe::_virtual_machine_error_instance = OopHandle(Universe::vm_global(), instance);
 992 
 993   Handle msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
 994   java_lang_Throwable::set_message(Universe::arithmetic_exception_instance(), msg());
 995 
 996   Universe::initialize_known_methods(CHECK_false);
 997 
 998   // This needs to be done before the first scavenge/gc, since
 999   // it's an input to soft ref clearing policy.
1000   {
1001     MutexLocker x(THREAD, Heap_lock);
1002     Universe::heap()->update_capacity_and_used_at_gc();
1003   }
1004 
1005   // ("weak") refs processing infrastructure initialization
1006   Universe::heap()->post_initialize();
1007 
1008   MemoryService::add_metaspace_memory_pools();
1009 
1010   MemoryService::set_universe_heap(Universe::heap());
1011 #if INCLUDE_CDS
1012   MetaspaceShared::post_initialize(CHECK_false);
1013 #endif
1014   return true;
1015 }
1016 
1017 
1018 void Universe::compute_base_vtable_size() {
1019   _base_vtable_size = ClassLoader::compute_Object_vtable();
1020 }
1021 
1022 void Universe::print_on(outputStream* st) {
1023   GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
1024   st->print_cr("Heap");
1025   heap()->print_on(st);
1026 }
1027 
1028 void Universe::print_heap_at_SIGBREAK() {
1029   if (PrintHeapAtSIGBREAK) {
1030     print_on(tty);
1031     tty->cr();
1032     tty->flush();
1033   }
1034 }
1035 
1036 void Universe::initialize_verify_flags() {
1037   verify_flags = 0;
1038   const char delimiter[] = " ,";
1039 
1040   size_t length = strlen(VerifySubSet);
1041   char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
1042   strncpy(subset_list, VerifySubSet, length + 1);
1043   char* save_ptr;
1044 
1045   char* token = strtok_r(subset_list, delimiter, &save_ptr);
1046   while (token != NULL) {
1047     if (strcmp(token, "threads") == 0) {
1048       verify_flags |= Verify_Threads;
1049     } else if (strcmp(token, "heap") == 0) {
1050       verify_flags |= Verify_Heap;
1051     } else if (strcmp(token, "symbol_table") == 0) {
1052       verify_flags |= Verify_SymbolTable;
1053     } else if (strcmp(token, "string_table") == 0) {
1054       verify_flags |= Verify_StringTable;
1055     } else if (strcmp(token, "codecache") == 0) {
1056       verify_flags |= Verify_CodeCache;
1057     } else if (strcmp(token, "dictionary") == 0) {
1058       verify_flags |= Verify_SystemDictionary;
1059     } else if (strcmp(token, "classloader_data_graph") == 0) {
1060       verify_flags |= Verify_ClassLoaderDataGraph;
1061     } else if (strcmp(token, "metaspace") == 0) {
1062       verify_flags |= Verify_MetaspaceUtils;
1063     } else if (strcmp(token, "jni_handles") == 0) {
1064       verify_flags |= Verify_JNIHandles;
1065     } else if (strcmp(token, "codecache_oops") == 0) {
1066       verify_flags |= Verify_CodeCacheOops;
1067     } else if (strcmp(token, "resolved_method_table") == 0) {
1068       verify_flags |= Verify_ResolvedMethodTable;
1069     } else if (strcmp(token, "stringdedup") == 0) {
1070       verify_flags |= Verify_StringDedup;
1071     } else {
1072       vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
1073     }
1074     token = strtok_r(NULL, delimiter, &save_ptr);
1075   }
1076   FREE_C_HEAP_ARRAY(char, subset_list);
1077 }
1078 
1079 bool Universe::should_verify_subset(uint subset) {
1080   if (verify_flags & subset) {
1081     return true;
1082   }
1083   return false;
1084 }
1085 
1086 void Universe::verify(VerifyOption option, const char* prefix) {
1087   COMPILER2_PRESENT(
1088     assert(!DerivedPointerTable::is_active(),
1089          "DPT should not be active during verification "
1090          "(of thread stacks below)");
1091   )
1092 
1093   Thread* thread = Thread::current();
1094   ResourceMark rm(thread);
1095   HandleMark hm(thread);  // Handles created during verification can be zapped
1096   _verify_count++;
1097 
1098   FormatBuffer<> title("Verifying %s", prefix);
1099   GCTraceTime(Info, gc, verify) tm(title.buffer());
1100   if (should_verify_subset(Verify_Threads)) {
1101     log_debug(gc, verify)("Threads");
1102     Threads::verify();
1103   }
1104   if (should_verify_subset(Verify_Heap)) {
1105     log_debug(gc, verify)("Heap");
1106     heap()->verify(option);
1107   }
1108   if (should_verify_subset(Verify_SymbolTable)) {
1109     log_debug(gc, verify)("SymbolTable");
1110     SymbolTable::verify();
1111   }
1112   if (should_verify_subset(Verify_StringTable)) {
1113     log_debug(gc, verify)("StringTable");
1114     StringTable::verify();
1115   }
1116   if (should_verify_subset(Verify_CodeCache)) {
1117     log_debug(gc, verify)("CodeCache");
1118     CodeCache::verify();
1119   }
1120   if (should_verify_subset(Verify_SystemDictionary)) {
1121     log_debug(gc, verify)("SystemDictionary");
1122     SystemDictionary::verify();
1123   }
1124   if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
1125     log_debug(gc, verify)("ClassLoaderDataGraph");
1126     ClassLoaderDataGraph::verify();
1127   }
1128   if (should_verify_subset(Verify_MetaspaceUtils)) {
1129     log_debug(gc, verify)("MetaspaceUtils");
1130     DEBUG_ONLY(MetaspaceUtils::verify();)
1131   }
1132   if (should_verify_subset(Verify_JNIHandles)) {
1133     log_debug(gc, verify)("JNIHandles");
1134     JNIHandles::verify();
1135   }
1136   if (should_verify_subset(Verify_CodeCacheOops)) {
1137     log_debug(gc, verify)("CodeCache Oops");
1138     CodeCache::verify_oops();
1139   }
1140   if (should_verify_subset(Verify_ResolvedMethodTable)) {
1141     log_debug(gc, verify)("ResolvedMethodTable Oops");
1142     ResolvedMethodTable::verify();
1143   }
1144   if (should_verify_subset(Verify_StringDedup)) {
1145     log_debug(gc, verify)("String Deduplication");
1146     StringDedup::verify();
1147   }
1148 }
1149 
1150 
1151 #ifndef PRODUCT
1152 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
1153   assert(low_boundary < high_boundary, "bad interval");
1154 
1155   // decide which low-order bits we require to be clear:
1156   size_t alignSize = MinObjAlignmentInBytes;
1157   size_t min_object_size = CollectedHeap::min_fill_size();
1158 
1159   // make an inclusive limit:
1160   uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1161   uintptr_t min = (uintptr_t)low_boundary;
1162   assert(min < max, "bad interval");
1163   uintptr_t diff = max ^ min;
1164 
1165   // throw away enough low-order bits to make the diff vanish
1166   uintptr_t mask = (uintptr_t)(-1);
1167   while ((mask & diff) != 0)
1168     mask <<= 1;
1169   uintptr_t bits = (min & mask);
1170   assert(bits == (max & mask), "correct mask");
1171   // check an intermediate value between min and max, just to make sure:
1172   assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1173 
1174   // require address alignment, too:
1175   mask |= (alignSize - 1);
1176 
1177   if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
1178     assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
1179   }
1180   _verify_oop_mask = mask;
1181   _verify_oop_bits = bits;
1182 }
1183 
1184 // Oop verification (see MacroAssembler::verify_oop)
1185 
1186 uintptr_t Universe::verify_oop_mask() {
1187   return _verify_oop_mask;
1188 }
1189 
1190 uintptr_t Universe::verify_oop_bits() {
1191   return _verify_oop_bits;
1192 }
1193 
1194 uintptr_t Universe::verify_mark_mask() {
1195   return markWord::lock_mask_in_place;
1196 }
1197 
1198 uintptr_t Universe::verify_mark_bits() {
1199   intptr_t mask = verify_mark_mask();
1200   intptr_t bits = (intptr_t)markWord::prototype().value();
1201   assert((bits & ~mask) == 0, "no stray header bits");
1202   return bits;
1203 }
1204 #endif // PRODUCT
1205 
1206 
1207 void LatestMethodCache::init(Klass* k, Method* m) {
1208   if (!UseSharedSpaces) {
1209     _klass = k;
1210   }
1211 #ifndef PRODUCT
1212   else {
1213     // sharing initilization should have already set up _klass
1214     assert(_klass != NULL, "just checking");
1215   }
1216 #endif
1217 
1218   _method_idnum = m->method_idnum();
1219   assert(_method_idnum >= 0, "sanity check");
1220 }
1221 
1222 
1223 Method* LatestMethodCache::get_method() {
1224   if (klass() == NULL) return NULL;
1225   InstanceKlass* ik = InstanceKlass::cast(klass());
1226   Method* m = ik->method_with_idnum(method_idnum());
1227   assert(m != NULL, "sanity check");
1228   return m;
1229 }
1230 
1231 #ifdef ASSERT
1232 // Release dummy object(s) at bottom of heap
1233 bool Universe::release_fullgc_alot_dummy() {
1234   MutexLocker ml(FullGCALot_lock);
1235   objArrayOop fullgc_alot_dummy_array = (objArrayOop)_fullgc_alot_dummy_array.resolve();
1236   if (fullgc_alot_dummy_array != NULL) {
1237     if (_fullgc_alot_dummy_next >= fullgc_alot_dummy_array->length()) {
1238       // No more dummies to release, release entire array instead
1239       _fullgc_alot_dummy_array.release(Universe::vm_global());
1240       return false;
1241     }
1242 
1243     // Release dummy at bottom of old generation
1244     fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1245   }
1246   return true;
1247 }
1248 
1249 bool Universe::is_gc_active() {
1250   return heap()->is_gc_active();
1251 }
1252 
1253 bool Universe::is_in_heap(const void* p) {
1254   return heap()->is_in(p);
1255 }
1256 
1257 #endif // ASSERT