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src/hotspot/share/oops/instanceKlass.cpp

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  53 #include "logging/logStream.hpp"
  54 #include "memory/allocation.inline.hpp"
  55 #include "memory/iterator.inline.hpp"
  56 #include "memory/metadataFactory.hpp"
  57 #include "memory/metaspaceClosure.hpp"
  58 #include "memory/oopFactory.hpp"
  59 #include "memory/resourceArea.hpp"
  60 #include "memory/universe.hpp"
  61 #include "oops/fieldStreams.inline.hpp"
  62 #include "oops/constantPool.hpp"
  63 #include "oops/instanceClassLoaderKlass.hpp"
  64 #include "oops/instanceKlass.inline.hpp"
  65 #include "oops/instanceMirrorKlass.hpp"
  66 #include "oops/instanceOop.hpp"
  67 #include "oops/instanceStackChunkKlass.hpp"
  68 #include "oops/klass.inline.hpp"
  69 #include "oops/method.hpp"
  70 #include "oops/oop.inline.hpp"
  71 #include "oops/recordComponent.hpp"
  72 #include "oops/symbol.hpp"

  73 #include "prims/jvmtiExport.hpp"
  74 #include "prims/jvmtiRedefineClasses.hpp"
  75 #include "prims/jvmtiThreadState.hpp"
  76 #include "prims/methodComparator.hpp"
  77 #include "runtime/arguments.hpp"
  78 #include "runtime/deoptimization.hpp"
  79 #include "runtime/atomic.hpp"
  80 #include "runtime/fieldDescriptor.inline.hpp"
  81 #include "runtime/handles.inline.hpp"
  82 #include "runtime/javaCalls.hpp"
  83 #include "runtime/javaThread.inline.hpp"
  84 #include "runtime/mutexLocker.hpp"
  85 #include "runtime/orderAccess.hpp"
  86 #include "runtime/os.inline.hpp"
  87 #include "runtime/reflectionUtils.hpp"
  88 #include "runtime/threads.hpp"
  89 #include "services/classLoadingService.hpp"
  90 #include "services/finalizerService.hpp"
  91 #include "services/threadService.hpp"
  92 #include "utilities/dtrace.hpp"

 149 
 150 static inline bool is_class_loader(const Symbol* class_name,
 151                                    const ClassFileParser& parser) {
 152   assert(class_name != nullptr, "invariant");
 153 
 154   if (class_name == vmSymbols::java_lang_ClassLoader()) {
 155     return true;
 156   }
 157 
 158   if (vmClasses::ClassLoader_klass_loaded()) {
 159     const Klass* const super_klass = parser.super_klass();
 160     if (super_klass != nullptr) {
 161       if (super_klass->is_subtype_of(vmClasses::ClassLoader_klass())) {
 162         return true;
 163       }
 164     }
 165   }
 166   return false;
 167 }
 168 




 169 static inline bool is_stack_chunk_class(const Symbol* class_name,
 170                                         const ClassLoaderData* loader_data) {
 171   return (class_name == vmSymbols::jdk_internal_vm_StackChunk() &&
 172           loader_data->is_the_null_class_loader_data());
 173 }
 174 
 175 // private: called to verify that k is a static member of this nest.
 176 // We know that k is an instance class in the same package and hence the
 177 // same classloader.
 178 bool InstanceKlass::has_nest_member(JavaThread* current, InstanceKlass* k) const {
 179   assert(!is_hidden(), "unexpected hidden class");
 180   if (_nest_members == nullptr || _nest_members == Universe::the_empty_short_array()) {
 181     if (log_is_enabled(Trace, class, nestmates)) {
 182       ResourceMark rm(current);
 183       log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s",
 184                                   k->external_name(), this->external_name());
 185     }
 186     return false;
 187   }
 188 

 421   log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
 422                               this->external_name(),
 423                               access ? "" : "NOT ",
 424                               k->external_name());
 425   return access;
 426 }
 427 
 428 const char* InstanceKlass::nest_host_error() {
 429   if (_nest_host_index == 0) {
 430     return nullptr;
 431   } else {
 432     constantPoolHandle cph(Thread::current(), constants());
 433     return SystemDictionary::find_nest_host_error(cph, (int)_nest_host_index);
 434   }
 435 }
 436 
 437 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
 438   const int size = InstanceKlass::size(parser.vtable_size(),
 439                                        parser.itable_size(),
 440                                        nonstatic_oop_map_size(parser.total_oop_map_count()),
 441                                        parser.is_interface());


 442 
 443   const Symbol* const class_name = parser.class_name();
 444   assert(class_name != nullptr, "invariant");
 445   ClassLoaderData* loader_data = parser.loader_data();
 446   assert(loader_data != nullptr, "invariant");
 447 
 448   InstanceKlass* ik;
 449 
 450   // Allocation
 451   if (parser.is_instance_ref_klass()) {
 452     // java.lang.ref.Reference
 453     ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
 454   } else if (class_name == vmSymbols::java_lang_Class()) {
 455     // mirror - java.lang.Class
 456     ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser);
 457   } else if (is_stack_chunk_class(class_name, loader_data)) {
 458     // stack chunk
 459     ik = new (loader_data, size, THREAD) InstanceStackChunkKlass(parser);
 460   } else if (is_class_loader(class_name, parser)) {
 461     // class loader - java.lang.ClassLoader
 462     ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);



 463   } else {
 464     // normal
 465     ik = new (loader_data, size, THREAD) InstanceKlass(parser);
 466   }
 467 
 468   // Check for pending exception before adding to the loader data and incrementing
 469   // class count.  Can get OOM here.
 470   if (HAS_PENDING_EXCEPTION) {
 471     return nullptr;
 472   }
 473 






 474   return ik;
 475 }
 476 























 477 
 478 // copy method ordering from resource area to Metaspace
 479 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
 480   if (m != nullptr) {
 481     // allocate a new array and copy contents (memcpy?)
 482     _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
 483     for (int i = 0; i < m->length(); i++) {
 484       _method_ordering->at_put(i, m->at(i));
 485     }
 486   } else {
 487     _method_ordering = Universe::the_empty_int_array();
 488   }
 489 }
 490 
 491 // create a new array of vtable_indices for default methods
 492 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
 493   Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
 494   assert(default_vtable_indices() == nullptr, "only create once");
 495   set_default_vtable_indices(vtable_indices);
 496   return vtable_indices;
 497 }
 498 
 499 static Monitor* create_init_monitor(const char* name) {
 500   return new Monitor(Mutex::safepoint, name);
 501 }
 502 
 503 InstanceKlass::InstanceKlass(const ClassFileParser& parser, KlassKind kind, ReferenceType reference_type) :
 504   Klass(kind),
 505   _nest_members(nullptr),
 506   _nest_host(nullptr),
 507   _permitted_subclasses(nullptr),
 508   _record_components(nullptr),
 509   _static_field_size(parser.static_field_size()),
 510   _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
 511   _itable_len(parser.itable_size()),
 512   _nest_host_index(0),
 513   _init_state(allocated),
 514   _reference_type(reference_type),
 515   _init_monitor(create_init_monitor("InstanceKlassInitMonitor_lock")),
 516   _init_thread(nullptr)



 517 {
 518   set_vtable_length(parser.vtable_size());
 519   set_access_flags(parser.access_flags());
 520   if (parser.is_hidden()) set_is_hidden();
 521   set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
 522                                                     false));



 523 
 524   assert(nullptr == _methods, "underlying memory not zeroed?");
 525   assert(is_instance_klass(), "is layout incorrect?");
 526   assert(size_helper() == parser.layout_size(), "incorrect size_helper?");




 527 }
 528 
 529 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
 530                                        Array<Method*>* methods) {
 531   if (methods != nullptr && methods != Universe::the_empty_method_array() &&
 532       !methods->is_shared()) {
 533     for (int i = 0; i < methods->length(); i++) {
 534       Method* method = methods->at(i);
 535       if (method == nullptr) continue;  // maybe null if error processing
 536       // Only want to delete methods that are not executing for RedefineClasses.
 537       // The previous version will point to them so they're not totally dangling
 538       assert (!method->on_stack(), "shouldn't be called with methods on stack");
 539       MetadataFactory::free_metadata(loader_data, method);
 540     }
 541     MetadataFactory::free_array<Method*>(loader_data, methods);
 542   }
 543 }
 544 
 545 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
 546                                           const Klass* super_klass,

 676       inner_classes() != Universe::the_empty_short_array() &&
 677       !inner_classes()->is_shared()) {
 678     MetadataFactory::free_array<jushort>(loader_data, inner_classes());
 679   }
 680   set_inner_classes(nullptr);
 681 
 682   if (nest_members() != nullptr &&
 683       nest_members() != Universe::the_empty_short_array() &&
 684       !nest_members()->is_shared()) {
 685     MetadataFactory::free_array<jushort>(loader_data, nest_members());
 686   }
 687   set_nest_members(nullptr);
 688 
 689   if (permitted_subclasses() != nullptr &&
 690       permitted_subclasses() != Universe::the_empty_short_array() &&
 691       !permitted_subclasses()->is_shared()) {
 692     MetadataFactory::free_array<jushort>(loader_data, permitted_subclasses());
 693   }
 694   set_permitted_subclasses(nullptr);
 695 






 696   // We should deallocate the Annotations instance if it's not in shared spaces.
 697   if (annotations() != nullptr && !annotations()->is_shared()) {
 698     MetadataFactory::free_metadata(loader_data, annotations());
 699   }
 700   set_annotations(nullptr);
 701 
 702   SystemDictionaryShared::handle_class_unloading(this);
 703 
 704 #if INCLUDE_CDS_JAVA_HEAP
 705   if (DumpSharedSpaces) {
 706     HeapShared::remove_scratch_objects(this);
 707   }
 708 #endif
 709 }
 710 
 711 bool InstanceKlass::is_record() const {
 712   return _record_components != nullptr &&
 713          is_final() &&
 714          java_super() == vmClasses::Record_klass();
 715 }

 832         vmSymbols::java_lang_IncompatibleClassChangeError(),
 833         "class %s has interface %s as super class",
 834         external_name(),
 835         super_klass->external_name()
 836       );
 837       return false;
 838     }
 839 
 840     InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
 841     ik_super->link_class_impl(CHECK_false);
 842   }
 843 
 844   // link all interfaces implemented by this class before linking this class
 845   Array<InstanceKlass*>* interfaces = local_interfaces();
 846   int num_interfaces = interfaces->length();
 847   for (int index = 0; index < num_interfaces; index++) {
 848     InstanceKlass* interk = interfaces->at(index);
 849     interk->link_class_impl(CHECK_false);
 850   }
 851 














































































 852   // in case the class is linked in the process of linking its superclasses
 853   if (is_linked()) {
 854     return true;
 855   }
 856 
 857   // trace only the link time for this klass that includes
 858   // the verification time
 859   PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
 860                              ClassLoader::perf_class_link_selftime(),
 861                              ClassLoader::perf_classes_linked(),
 862                              jt->get_thread_stat()->perf_recursion_counts_addr(),
 863                              jt->get_thread_stat()->perf_timers_addr(),
 864                              PerfClassTraceTime::CLASS_LINK);
 865 
 866   // verification & rewriting
 867   {
 868     LockLinkState init_lock(this, jt);
 869 
 870     // rewritten will have been set if loader constraint error found
 871     // on an earlier link attempt

1093       set_init_thread(jt);
1094     }
1095   }
1096 
1097   // Throw error outside lock
1098   if (throw_error) {
1099     DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
1100     ResourceMark rm(THREAD);
1101     Handle cause(THREAD, get_initialization_error(THREAD));
1102 
1103     stringStream ss;
1104     ss.print("Could not initialize class %s", external_name());
1105     if (cause.is_null()) {
1106       THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), ss.as_string());
1107     } else {
1108       THROW_MSG_CAUSE(vmSymbols::java_lang_NoClassDefFoundError(),
1109                       ss.as_string(), cause);
1110     }
1111   }
1112 



















1113   // Step 7
1114   // Next, if C is a class rather than an interface, initialize it's super class and super
1115   // interfaces.
1116   if (!is_interface()) {
1117     Klass* super_klass = super();
1118     if (super_klass != nullptr && super_klass->should_be_initialized()) {
1119       super_klass->initialize(THREAD);
1120     }
1121     // If C implements any interface that declares a non-static, concrete method,
1122     // the initialization of C triggers initialization of its super interfaces.
1123     // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
1124     // having a superinterface that declares, non-static, concrete methods
1125     if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1126       initialize_super_interfaces(THREAD);
1127     }
1128 
1129     // If any exceptions, complete abruptly, throwing the same exception as above.
1130     if (HAS_PENDING_EXCEPTION) {
1131       Handle e(THREAD, PENDING_EXCEPTION);
1132       CLEAR_PENDING_EXCEPTION;
1133       {
1134         EXCEPTION_MARK;
1135         add_initialization_error(THREAD, e);
1136         // Locks object, set state, and notify all waiting threads
1137         set_initialization_state_and_notify(initialization_error, THREAD);
1138         CLEAR_PENDING_EXCEPTION;
1139       }
1140       DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1141       THROW_OOP(e());
1142     }
1143   }
1144 
1145 
1146   // Step 8









































1147   {
1148     DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1149     if (class_initializer() != nullptr) {
1150       // Timer includes any side effects of class initialization (resolution,
1151       // etc), but not recursive entry into call_class_initializer().
1152       PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1153                                ClassLoader::perf_class_init_selftime(),
1154                                ClassLoader::perf_classes_inited(),
1155                                jt->get_thread_stat()->perf_recursion_counts_addr(),
1156                                jt->get_thread_stat()->perf_timers_addr(),
1157                                PerfClassTraceTime::CLASS_CLINIT);
1158       call_class_initializer(THREAD);
1159     } else {
1160       // The elapsed time is so small it's not worth counting.
1161       if (UsePerfData) {
1162         ClassLoader::perf_classes_inited()->inc();
1163       }
1164       call_class_initializer(THREAD);
1165     }
1166   }
1167 
1168   // Step 9
1169   if (!HAS_PENDING_EXCEPTION) {
1170     set_initialization_state_and_notify(fully_initialized, THREAD);
1171     debug_only(vtable().verify(tty, true);)
1172   }
1173   else {
1174     // Step 10 and 11
1175     Handle e(THREAD, PENDING_EXCEPTION);
1176     CLEAR_PENDING_EXCEPTION;
1177     // JVMTI has already reported the pending exception
1178     // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1179     JvmtiExport::clear_detected_exception(jt);
1180     {
1181       EXCEPTION_MARK;
1182       add_initialization_error(THREAD, e);
1183       set_initialization_state_and_notify(initialization_error, THREAD);
1184       CLEAR_PENDING_EXCEPTION;   // ignore any exception thrown, class initialization error is thrown below
1185       // JVMTI has already reported the pending exception
1186       // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1187       JvmtiExport::clear_detected_exception(jt);
1188     }
1189     DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1190     if (e->is_a(vmClasses::Error_klass())) {
1191       THROW_OOP(e());
1192     } else {
1193       JavaCallArguments args(e);
1194       THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),

1480               : vmSymbols::java_lang_InstantiationException(), external_name());
1481   }
1482   if (this == vmClasses::Class_klass()) {
1483     ResourceMark rm(THREAD);
1484     THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1485               : vmSymbols::java_lang_IllegalAccessException(), external_name());
1486   }
1487 }
1488 
1489 Klass* InstanceKlass::array_klass(int n, TRAPS) {
1490   // Need load-acquire for lock-free read
1491   if (array_klasses_acquire() == nullptr) {
1492     ResourceMark rm(THREAD);
1493     JavaThread *jt = THREAD;
1494     {
1495       // Atomic creation of array_klasses
1496       MutexLocker ma(THREAD, MultiArray_lock);
1497 
1498       // Check if update has already taken place
1499       if (array_klasses() == nullptr) {
1500         ObjArrayKlass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL);

1501         // use 'release' to pair with lock-free load
1502         release_set_array_klasses(k);
1503       }
1504     }
1505   }
1506   // array_klasses() will always be set at this point
1507   ObjArrayKlass* oak = array_klasses();
1508   return oak->array_klass(n, THREAD);
1509 }
1510 
1511 Klass* InstanceKlass::array_klass_or_null(int n) {
1512   // Need load-acquire for lock-free read
1513   ObjArrayKlass* oak = array_klasses_acquire();
1514   if (oak == nullptr) {
1515     return nullptr;
1516   } else {
1517     return oak->array_klass_or_null(n);
1518   }
1519 }
1520 
1521 Klass* InstanceKlass::array_klass(TRAPS) {
1522   return array_klass(1, THREAD);
1523 }
1524 
1525 Klass* InstanceKlass::array_klass_or_null() {
1526   return array_klass_or_null(1);
1527 }
1528 
1529 static int call_class_initializer_counter = 0;   // for debugging
1530 
1531 Method* InstanceKlass::class_initializer() const {
1532   Method* clinit = find_method(
1533       vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1534   if (clinit != nullptr && clinit->has_valid_initializer_flags()) {
1535     return clinit;
1536   }
1537   return nullptr;
1538 }
1539 
1540 void InstanceKlass::call_class_initializer(TRAPS) {
1541   if (ReplayCompiles &&
1542       (ReplaySuppressInitializers == 1 ||
1543        (ReplaySuppressInitializers >= 2 && class_loader() != nullptr))) {
1544     // Hide the existence of the initializer for the purpose of replaying the compile
1545     return;
1546   }
1547 
1548 #if INCLUDE_CDS
1549   // This is needed to ensure the consistency of the archived heap objects.
1550   if (has_archived_enum_objs()) {
1551     assert(is_shared(), "must be");
1552     bool initialized = HeapShared::initialize_enum_klass(this, CHECK);
1553     if (initialized) {
1554       return;

1563     ResourceMark rm(THREAD);
1564     LogStream ls(lt);
1565     ls.print("%d Initializing ", call_class_initializer_counter++);
1566     name()->print_value_on(&ls);
1567     ls.print_cr("%s (" PTR_FORMAT ")", h_method() == nullptr ? "(no method)" : "", p2i(this));
1568   }
1569   if (h_method() != nullptr) {
1570     JavaCallArguments args; // No arguments
1571     JavaValue result(T_VOID);
1572     JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1573   }
1574 }
1575 
1576 
1577 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1578   InterpreterOopMap* entry_for) {
1579   // Lazily create the _oop_map_cache at first request
1580   // Lock-free access requires load_acquire.
1581   OopMapCache* oop_map_cache = Atomic::load_acquire(&_oop_map_cache);
1582   if (oop_map_cache == nullptr) {
1583     MutexLocker x(OopMapCacheAlloc_lock);
1584     // Check if _oop_map_cache was allocated while we were waiting for this lock
1585     if ((oop_map_cache = _oop_map_cache) == nullptr) {
1586       oop_map_cache = new OopMapCache();
1587       // Ensure _oop_map_cache is stable, since it is examined without a lock
1588       Atomic::release_store(&_oop_map_cache, oop_map_cache);
1589     }
1590   }
1591   // _oop_map_cache is constant after init; lookup below does its own locking.
1592   oop_map_cache->lookup(method, bci, entry_for);
1593 }
1594 
1595 bool InstanceKlass::contains_field_offset(int offset) {
1596   fieldDescriptor fd;
1597   return find_field_from_offset(offset, false, &fd);
1598 }
1599 
1600 FieldInfo InstanceKlass::field(int index) const {
1601   for (AllFieldStream fs(this); !fs.done(); fs.next()) {
1602     if (fs.index() == index) {
1603       return fs.to_FieldInfo();
1604     }
1605   }
1606   fatal("Field not found");
1607   return FieldInfo();
1608 }
1609 
1610 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1611   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1612     Symbol* f_name = fs.name();
1613     Symbol* f_sig  = fs.signature();
1614     if (f_name == name && f_sig == sig) {
1615       fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1616       return true;
1617     }
1618   }

1660 
1661 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1662   // search order according to newest JVM spec (5.4.3.2, p.167).
1663   // 1) search for field in current klass
1664   if (find_local_field(name, sig, fd)) {
1665     if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1666   }
1667   // 2) search for field recursively in direct superinterfaces
1668   if (is_static) {
1669     Klass* intf = find_interface_field(name, sig, fd);
1670     if (intf != nullptr) return intf;
1671   }
1672   // 3) apply field lookup recursively if superclass exists
1673   { Klass* supr = super();
1674     if (supr != nullptr) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
1675   }
1676   // 4) otherwise field lookup fails
1677   return nullptr;
1678 }
1679 









1680 
1681 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1682   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1683     if (fs.offset() == offset) {
1684       fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1685       if (fd->is_static() == is_static) return true;
1686     }
1687   }
1688   return false;
1689 }
1690 
1691 
1692 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1693   Klass* klass = const_cast<InstanceKlass*>(this);
1694   while (klass != nullptr) {
1695     if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
1696       return true;
1697     }
1698     klass = klass->super();
1699   }

2052 }
2053 
2054 // uncached_lookup_method searches both the local class methods array and all
2055 // superclasses methods arrays, skipping any overpass methods in superclasses,
2056 // and possibly skipping private methods.
2057 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
2058                                               const Symbol* signature,
2059                                               OverpassLookupMode overpass_mode,
2060                                               PrivateLookupMode private_mode) const {
2061   OverpassLookupMode overpass_local_mode = overpass_mode;
2062   const Klass* klass = this;
2063   while (klass != nullptr) {
2064     Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
2065                                                                         signature,
2066                                                                         overpass_local_mode,
2067                                                                         StaticLookupMode::find,
2068                                                                         private_mode);
2069     if (method != nullptr) {
2070       return method;
2071     }




2072     klass = klass->super();
2073     overpass_local_mode = OverpassLookupMode::skip;   // Always ignore overpass methods in superclasses
2074   }
2075   return nullptr;
2076 }
2077 
2078 #ifdef ASSERT
2079 // search through class hierarchy and return true if this class or
2080 // one of the superclasses was redefined
2081 bool InstanceKlass::has_redefined_this_or_super() const {
2082   const Klass* klass = this;
2083   while (klass != nullptr) {
2084     if (InstanceKlass::cast(klass)->has_been_redefined()) {
2085       return true;
2086     }
2087     klass = klass->super();
2088   }
2089   return false;
2090 }
2091 #endif

2532     int method_table_offset_in_words = ioe->offset()/wordSize;
2533     int itable_offset_in_words = (int)(start_of_itable() - (intptr_t*)this);
2534 
2535     int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words)
2536                          / itableOffsetEntry::size();
2537 
2538     for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2539       if (ioe->interface_klass() != nullptr) {
2540         it->push(ioe->interface_klass_addr());
2541         itableMethodEntry* ime = ioe->first_method_entry(this);
2542         int n = klassItable::method_count_for_interface(ioe->interface_klass());
2543         for (int index = 0; index < n; index ++) {
2544           it->push(ime[index].method_addr());
2545         }
2546       }
2547     }
2548   }
2549 
2550   it->push(&_nest_members);
2551   it->push(&_permitted_subclasses);

2552   it->push(&_record_components);






2553 }
2554 
2555 #if INCLUDE_CDS
2556 void InstanceKlass::remove_unshareable_info() {
2557 
2558   if (is_linked()) {
2559     assert(can_be_verified_at_dumptime(), "must be");
2560     // Remember this so we can avoid walking the hierarchy at runtime.
2561     set_verified_at_dump_time();
2562   }
2563 
2564   Klass::remove_unshareable_info();
2565 
2566   if (SystemDictionaryShared::has_class_failed_verification(this)) {
2567     // Classes are attempted to link during dumping and may fail,
2568     // but these classes are still in the dictionary and class list in CLD.
2569     // If the class has failed verification, there is nothing else to remove.
2570     return;
2571   }
2572 

2576   // being added to class hierarchy (see InstanceKlass:::add_to_hierarchy()).
2577   _init_state = allocated;
2578 
2579   { // Otherwise this needs to take out the Compile_lock.
2580     assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2581     init_implementor();
2582   }
2583 
2584   constants()->remove_unshareable_info();
2585 
2586   for (int i = 0; i < methods()->length(); i++) {
2587     Method* m = methods()->at(i);
2588     m->remove_unshareable_info();
2589   }
2590 
2591   // do array classes also.
2592   if (array_klasses() != nullptr) {
2593     array_klasses()->remove_unshareable_info();
2594   }
2595 
2596   // These are not allocated from metaspace. They are safe to set to null.








2597   _source_debug_extension = nullptr;
2598   _dep_context = nullptr;
2599   _osr_nmethods_head = nullptr;
2600 #if INCLUDE_JVMTI
2601   _breakpoints = nullptr;
2602   _previous_versions = nullptr;
2603   _cached_class_file = nullptr;
2604   _jvmti_cached_class_field_map = nullptr;
2605 #endif
2606 
2607   _init_thread = nullptr;
2608   _methods_jmethod_ids = nullptr;
2609   _jni_ids = nullptr;
2610   _oop_map_cache = nullptr;
2611   // clear _nest_host to ensure re-load at runtime
2612   _nest_host = nullptr;
2613   init_shared_package_entry();
2614   _dep_context_last_cleaned = 0;
2615   _init_monitor = nullptr;
2616 

2660 void InstanceKlass::compute_has_loops_flag_for_methods() {
2661   Array<Method*>* methods = this->methods();
2662   for (int index = 0; index < methods->length(); ++index) {
2663     Method* m = methods->at(index);
2664     if (!m->is_overpass()) { // work around JDK-8305771
2665       m->compute_has_loops_flag();
2666     }
2667   }
2668 }
2669 
2670 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain,
2671                                              PackageEntry* pkg_entry, TRAPS) {
2672   // InstanceKlass::add_to_hierarchy() sets the init_state to loaded
2673   // before the InstanceKlass is added to the SystemDictionary. Make
2674   // sure the current state is <loaded.
2675   assert(!is_loaded(), "invalid init state");
2676   assert(!shared_loading_failed(), "Must not try to load failed class again");
2677   set_package(loader_data, pkg_entry, CHECK);
2678   Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2679 




2680   Array<Method*>* methods = this->methods();
2681   int num_methods = methods->length();
2682   for (int index = 0; index < num_methods; ++index) {
2683     methods->at(index)->restore_unshareable_info(CHECK);
2684   }
2685 #if INCLUDE_JVMTI
2686   if (JvmtiExport::has_redefined_a_class()) {
2687     // Reinitialize vtable because RedefineClasses may have changed some
2688     // entries in this vtable for super classes so the CDS vtable might
2689     // point to old or obsolete entries.  RedefineClasses doesn't fix up
2690     // vtables in the shared system dictionary, only the main one.
2691     // It also redefines the itable too so fix that too.
2692     // First fix any default methods that point to a super class that may
2693     // have been redefined.
2694     bool trace_name_printed = false;
2695     adjust_default_methods(&trace_name_printed);
2696     vtable().initialize_vtable();
2697     itable().initialize_itable();
2698   }
2699 #endif

2886   } else {
2887     // Adding one to the attribute length in order to store a null terminator
2888     // character could cause an overflow because the attribute length is
2889     // already coded with an u4 in the classfile, but in practice, it's
2890     // unlikely to happen.
2891     assert((length+1) > length, "Overflow checking");
2892     char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2893     for (int i = 0; i < length; i++) {
2894       sde[i] = array[i];
2895     }
2896     sde[length] = '\0';
2897     _source_debug_extension = sde;
2898   }
2899 }
2900 
2901 Symbol* InstanceKlass::generic_signature() const                   { return _constants->generic_signature(); }
2902 u2 InstanceKlass::generic_signature_index() const                  { return _constants->generic_signature_index(); }
2903 void InstanceKlass::set_generic_signature_index(u2 sig_index)      { _constants->set_generic_signature_index(sig_index); }
2904 
2905 const char* InstanceKlass::signature_name() const {


2906 

2907   // Get the internal name as a c string
2908   const char* src = (const char*) (name()->as_C_string());
2909   const int src_length = (int)strlen(src);
2910 
2911   char* dest = NEW_RESOURCE_ARRAY(char, src_length + 3);
2912 
2913   // Add L as type indicator
2914   int dest_index = 0;
2915   dest[dest_index++] = JVM_SIGNATURE_CLASS;
2916 
2917   // Add the actual class name
2918   for (int src_index = 0; src_index < src_length; ) {
2919     dest[dest_index++] = src[src_index++];
2920   }
2921 
2922   if (is_hidden()) { // Replace the last '+' with a '.'.
2923     for (int index = (int)src_length; index > 0; index--) {
2924       if (dest[index] == '+') {
2925         dest[index] = JVM_SIGNATURE_DOT;
2926         break;
2927       }
2928     }
2929   }
2930 
2931   // Add the semicolon and the null
2932   dest[dest_index++] = JVM_SIGNATURE_ENDCLASS;
2933   dest[dest_index] = '\0';
2934   return dest;
2935 }

3237 jint InstanceKlass::compute_modifier_flags() const {
3238   jint access = access_flags().as_int();
3239 
3240   // But check if it happens to be member class.
3241   InnerClassesIterator iter(this);
3242   for (; !iter.done(); iter.next()) {
3243     int ioff = iter.inner_class_info_index();
3244     // Inner class attribute can be zero, skip it.
3245     // Strange but true:  JVM spec. allows null inner class refs.
3246     if (ioff == 0) continue;
3247 
3248     // only look at classes that are already loaded
3249     // since we are looking for the flags for our self.
3250     Symbol* inner_name = constants()->klass_name_at(ioff);
3251     if (name() == inner_name) {
3252       // This is really a member class.
3253       access = iter.inner_access_flags();
3254       break;
3255     }
3256   }
3257   // Remember to strip ACC_SUPER bit
3258   return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
3259 }
3260 
3261 jint InstanceKlass::jvmti_class_status() const {
3262   jint result = 0;
3263 
3264   if (is_linked()) {
3265     result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3266   }
3267 
3268   if (is_initialized()) {
3269     assert(is_linked(), "Class status is not consistent");
3270     result |= JVMTI_CLASS_STATUS_INITIALIZED;
3271   }
3272   if (is_in_error_state()) {
3273     result |= JVMTI_CLASS_STATUS_ERROR;
3274   }
3275   return result;
3276 }
3277 
3278 Method* InstanceKlass::method_at_itable(InstanceKlass* holder, int index, TRAPS) {

3495     }
3496     osr = osr->osr_link();
3497   }
3498 
3499   assert(match_level == false || best == nullptr, "shouldn't pick up anything if match_level is set");
3500   if (best != nullptr && best->comp_level() >= comp_level) {
3501     return best;
3502   }
3503   return nullptr;
3504 }
3505 
3506 // -----------------------------------------------------------------------------------------------------
3507 // Printing
3508 
3509 #define BULLET  " - "
3510 
3511 static const char* state_names[] = {
3512   "allocated", "loaded", "being_linked", "linked", "being_initialized", "fully_initialized", "initialization_error"
3513 };
3514 
3515 static void print_vtable(intptr_t* start, int len, outputStream* st) {



3516   for (int i = 0; i < len; i++) {
3517     intptr_t e = start[i];
3518     st->print("%d : " INTPTR_FORMAT, i, e);





3519     if (MetaspaceObj::is_valid((Metadata*)e)) {
3520       st->print(" ");
3521       ((Metadata*)e)->print_value_on(st);






3522     }
3523     st->cr();
3524   }
3525 }
3526 
3527 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3528   return print_vtable(reinterpret_cast<intptr_t*>(start), len, st);





















3529 }
3530 
3531 const char* InstanceKlass::init_state_name() const {
3532   return state_names[init_state()];
3533 }
3534 
3535 void InstanceKlass::print_on(outputStream* st) const {
3536   assert(is_klass(), "must be klass");
3537   Klass::print_on(st);
3538 
3539   st->print(BULLET"instance size:     %d", size_helper());                        st->cr();
3540   st->print(BULLET"klass size:        %d", size());                               st->cr();
3541   st->print(BULLET"access:            "); access_flags().print_on(st);            st->cr();
3542   st->print(BULLET"flags:             "); _misc_flags.print_on(st);               st->cr();
3543   st->print(BULLET"state:             "); st->print_cr("%s", init_state_name());
3544   st->print(BULLET"name:              "); name()->print_value_on(st);             st->cr();
3545   st->print(BULLET"super:             "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3546   st->print(BULLET"sub:               ");
3547   Klass* sub = subklass();
3548   int n;
3549   for (n = 0; sub != nullptr; n++, sub = sub->next_sibling()) {
3550     if (n < MaxSubklassPrintSize) {
3551       sub->print_value_on(st);
3552       st->print("   ");
3553     }
3554   }
3555   if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
3556   st->cr();
3557 
3558   if (is_interface()) {
3559     st->print_cr(BULLET"nof implementors:  %d", nof_implementors());
3560     if (nof_implementors() == 1) {
3561       st->print_cr(BULLET"implementor:    ");
3562       st->print("   ");
3563       implementor()->print_value_on(st);
3564       st->cr();
3565     }
3566   }
3567 
3568   st->print(BULLET"arrays:            "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3569   st->print(BULLET"methods:           "); methods()->print_value_on(st);                  st->cr();
3570   if (Verbose || WizardMode) {
3571     Array<Method*>* method_array = methods();
3572     for (int i = 0; i < method_array->length(); i++) {
3573       st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3574     }
3575   }
3576   st->print(BULLET"method ordering:   "); method_ordering()->print_value_on(st);      st->cr();
3577   st->print(BULLET"default_methods:   "); default_methods()->print_value_on(st);      st->cr();
3578   if (Verbose && default_methods() != nullptr) {
3579     Array<Method*>* method_array = default_methods();
3580     for (int i = 0; i < method_array->length(); i++) {
3581       st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3582     }
3583   }
3584   if (default_vtable_indices() != nullptr) {
3585     st->print(BULLET"default vtable indices:   "); default_vtable_indices()->print_value_on(st);       st->cr();
3586   }
3587   st->print(BULLET"local interfaces:  "); local_interfaces()->print_value_on(st);      st->cr();
3588   st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
3589   st->print(BULLET"constants:         "); constants()->print_value_on(st);         st->cr();
3590   if (class_loader_data() != nullptr) {
3591     st->print(BULLET"class loader data:  ");
3592     class_loader_data()->print_value_on(st);
3593     st->cr();
3594   }
3595   if (source_file_name() != nullptr) {
3596     st->print(BULLET"source file:       ");
3597     source_file_name()->print_value_on(st);
3598     st->cr();
3599   }
3600   if (source_debug_extension() != nullptr) {
3601     st->print(BULLET"source debug extension:       ");
3602     st->print("%s", source_debug_extension());
3603     st->cr();
3604   }
3605   st->print(BULLET"class annotations:       "); class_annotations()->print_value_on(st); st->cr();
3606   st->print(BULLET"class type annotations:  "); class_type_annotations()->print_value_on(st); st->cr();
3607   st->print(BULLET"field annotations:       "); fields_annotations()->print_value_on(st); st->cr();
3608   st->print(BULLET"field type annotations:  "); fields_type_annotations()->print_value_on(st); st->cr();

3614          pv_node = pv_node->previous_versions()) {
3615       if (!have_pv)
3616         st->print(BULLET"previous version:  ");
3617       have_pv = true;
3618       pv_node->constants()->print_value_on(st);
3619     }
3620     if (have_pv) st->cr();
3621   }
3622 
3623   if (generic_signature() != nullptr) {
3624     st->print(BULLET"generic signature: ");
3625     generic_signature()->print_value_on(st);
3626     st->cr();
3627   }
3628   st->print(BULLET"inner classes:     "); inner_classes()->print_value_on(st);     st->cr();
3629   st->print(BULLET"nest members:     "); nest_members()->print_value_on(st);     st->cr();
3630   if (record_components() != nullptr) {
3631     st->print(BULLET"record components:     "); record_components()->print_value_on(st);     st->cr();
3632   }
3633   st->print(BULLET"permitted subclasses:     "); permitted_subclasses()->print_value_on(st);     st->cr();

3634   if (java_mirror() != nullptr) {
3635     st->print(BULLET"java mirror:       ");
3636     java_mirror()->print_value_on(st);
3637     st->cr();
3638   } else {
3639     st->print_cr(BULLET"java mirror:       null");
3640   }
3641   st->print(BULLET"vtable length      %d  (start addr: " PTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3642   if (vtable_length() > 0 && (Verbose || WizardMode))  print_vtable(start_of_vtable(), vtable_length(), st);
3643   st->print(BULLET"itable length      %d (start addr: " PTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3644   if (itable_length() > 0 && (Verbose || WizardMode))  print_vtable(start_of_itable(), itable_length(), st);
3645   st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3646   FieldPrinter print_static_field(st);
3647   ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3648   st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3649   FieldPrinter print_nonstatic_field(st);
3650   InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3651   ik->print_nonstatic_fields(&print_nonstatic_field);
3652 
3653   st->print(BULLET"non-static oop maps: ");
3654   OopMapBlock* map     = start_of_nonstatic_oop_maps();
3655   OopMapBlock* end_map = map + nonstatic_oop_map_count();
3656   while (map < end_map) {
3657     st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3658     map++;
3659   }
3660   st->cr();
3661 }
3662 
3663 void InstanceKlass::print_value_on(outputStream* st) const {
3664   assert(is_klass(), "must be klass");

  53 #include "logging/logStream.hpp"
  54 #include "memory/allocation.inline.hpp"
  55 #include "memory/iterator.inline.hpp"
  56 #include "memory/metadataFactory.hpp"
  57 #include "memory/metaspaceClosure.hpp"
  58 #include "memory/oopFactory.hpp"
  59 #include "memory/resourceArea.hpp"
  60 #include "memory/universe.hpp"
  61 #include "oops/fieldStreams.inline.hpp"
  62 #include "oops/constantPool.hpp"
  63 #include "oops/instanceClassLoaderKlass.hpp"
  64 #include "oops/instanceKlass.inline.hpp"
  65 #include "oops/instanceMirrorKlass.hpp"
  66 #include "oops/instanceOop.hpp"
  67 #include "oops/instanceStackChunkKlass.hpp"
  68 #include "oops/klass.inline.hpp"
  69 #include "oops/method.hpp"
  70 #include "oops/oop.inline.hpp"
  71 #include "oops/recordComponent.hpp"
  72 #include "oops/symbol.hpp"
  73 #include "oops/inlineKlass.hpp"
  74 #include "prims/jvmtiExport.hpp"
  75 #include "prims/jvmtiRedefineClasses.hpp"
  76 #include "prims/jvmtiThreadState.hpp"
  77 #include "prims/methodComparator.hpp"
  78 #include "runtime/arguments.hpp"
  79 #include "runtime/deoptimization.hpp"
  80 #include "runtime/atomic.hpp"
  81 #include "runtime/fieldDescriptor.inline.hpp"
  82 #include "runtime/handles.inline.hpp"
  83 #include "runtime/javaCalls.hpp"
  84 #include "runtime/javaThread.inline.hpp"
  85 #include "runtime/mutexLocker.hpp"
  86 #include "runtime/orderAccess.hpp"
  87 #include "runtime/os.inline.hpp"
  88 #include "runtime/reflectionUtils.hpp"
  89 #include "runtime/threads.hpp"
  90 #include "services/classLoadingService.hpp"
  91 #include "services/finalizerService.hpp"
  92 #include "services/threadService.hpp"
  93 #include "utilities/dtrace.hpp"

 150 
 151 static inline bool is_class_loader(const Symbol* class_name,
 152                                    const ClassFileParser& parser) {
 153   assert(class_name != nullptr, "invariant");
 154 
 155   if (class_name == vmSymbols::java_lang_ClassLoader()) {
 156     return true;
 157   }
 158 
 159   if (vmClasses::ClassLoader_klass_loaded()) {
 160     const Klass* const super_klass = parser.super_klass();
 161     if (super_klass != nullptr) {
 162       if (super_klass->is_subtype_of(vmClasses::ClassLoader_klass())) {
 163         return true;
 164       }
 165     }
 166   }
 167   return false;
 168 }
 169 
 170 bool InstanceKlass::field_is_null_free_inline_type(int index) const {
 171   return field(index).field_flags().is_null_free_inline_type();
 172 }
 173 
 174 static inline bool is_stack_chunk_class(const Symbol* class_name,
 175                                         const ClassLoaderData* loader_data) {
 176   return (class_name == vmSymbols::jdk_internal_vm_StackChunk() &&
 177           loader_data->is_the_null_class_loader_data());
 178 }
 179 
 180 // private: called to verify that k is a static member of this nest.
 181 // We know that k is an instance class in the same package and hence the
 182 // same classloader.
 183 bool InstanceKlass::has_nest_member(JavaThread* current, InstanceKlass* k) const {
 184   assert(!is_hidden(), "unexpected hidden class");
 185   if (_nest_members == nullptr || _nest_members == Universe::the_empty_short_array()) {
 186     if (log_is_enabled(Trace, class, nestmates)) {
 187       ResourceMark rm(current);
 188       log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s",
 189                                   k->external_name(), this->external_name());
 190     }
 191     return false;
 192   }
 193 

 426   log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
 427                               this->external_name(),
 428                               access ? "" : "NOT ",
 429                               k->external_name());
 430   return access;
 431 }
 432 
 433 const char* InstanceKlass::nest_host_error() {
 434   if (_nest_host_index == 0) {
 435     return nullptr;
 436   } else {
 437     constantPoolHandle cph(Thread::current(), constants());
 438     return SystemDictionary::find_nest_host_error(cph, (int)_nest_host_index);
 439   }
 440 }
 441 
 442 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
 443   const int size = InstanceKlass::size(parser.vtable_size(),
 444                                        parser.itable_size(),
 445                                        nonstatic_oop_map_size(parser.total_oop_map_count()),
 446                                        parser.is_interface(),
 447                                        parser.has_inline_fields() ? parser.java_fields_count() : 0,
 448                                        parser.is_inline_type());
 449 
 450   const Symbol* const class_name = parser.class_name();
 451   assert(class_name != nullptr, "invariant");
 452   ClassLoaderData* loader_data = parser.loader_data();
 453   assert(loader_data != nullptr, "invariant");
 454 
 455   InstanceKlass* ik;
 456 
 457   // Allocation
 458   if (parser.is_instance_ref_klass()) {
 459     // java.lang.ref.Reference
 460     ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
 461   } else if (class_name == vmSymbols::java_lang_Class()) {
 462     // mirror - java.lang.Class
 463     ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser);
 464   } else if (is_stack_chunk_class(class_name, loader_data)) {
 465     // stack chunk
 466     ik = new (loader_data, size, THREAD) InstanceStackChunkKlass(parser);
 467   } else if (is_class_loader(class_name, parser)) {
 468     // class loader - java.lang.ClassLoader
 469     ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);
 470   } else if (parser.is_inline_type()) {
 471     // inline type
 472     ik = new (loader_data, size, THREAD) InlineKlass(parser);
 473   } else {
 474     // normal
 475     ik = new (loader_data, size, THREAD) InstanceKlass(parser);
 476   }
 477 
 478   // Check for pending exception before adding to the loader data and incrementing
 479   // class count.  Can get OOM here.
 480   if (HAS_PENDING_EXCEPTION) {
 481     return nullptr;
 482   }
 483 
 484 #ifdef ASSERT
 485   ik->bounds_check((address) ik->start_of_vtable(), false, size);
 486   ik->bounds_check((address) ik->start_of_itable(), false, size);
 487   ik->bounds_check((address) ik->end_of_itable(), true, size);
 488   ik->bounds_check((address) ik->end_of_nonstatic_oop_maps(), true, size);
 489 #endif //ASSERT
 490   return ik;
 491 }
 492 
 493 #ifndef PRODUCT
 494 bool InstanceKlass::bounds_check(address addr, bool edge_ok, intptr_t size_in_bytes) const {
 495   const char* bad = nullptr;
 496   address end = nullptr;
 497   if (addr < (address)this) {
 498     bad = "before";
 499   } else if (addr == (address)this) {
 500     if (edge_ok)  return true;
 501     bad = "just before";
 502   } else if (addr == (end = (address)this + sizeof(intptr_t) * (size_in_bytes < 0 ? size() : size_in_bytes))) {
 503     if (edge_ok)  return true;
 504     bad = "just after";
 505   } else if (addr > end) {
 506     bad = "after";
 507   } else {
 508     return true;
 509   }
 510   tty->print_cr("%s object bounds: " INTPTR_FORMAT " [" INTPTR_FORMAT ".." INTPTR_FORMAT "]",
 511       bad, (intptr_t)addr, (intptr_t)this, (intptr_t)end);
 512   Verbose = WizardMode = true; this->print(); //@@
 513   return false;
 514 }
 515 #endif //PRODUCT
 516 
 517 // copy method ordering from resource area to Metaspace
 518 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
 519   if (m != nullptr) {
 520     // allocate a new array and copy contents (memcpy?)
 521     _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
 522     for (int i = 0; i < m->length(); i++) {
 523       _method_ordering->at_put(i, m->at(i));
 524     }
 525   } else {
 526     _method_ordering = Universe::the_empty_int_array();
 527   }
 528 }
 529 
 530 // create a new array of vtable_indices for default methods
 531 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
 532   Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
 533   assert(default_vtable_indices() == nullptr, "only create once");
 534   set_default_vtable_indices(vtable_indices);
 535   return vtable_indices;
 536 }
 537 
 538 static Monitor* create_init_monitor(const char* name) {
 539   return new Monitor(Mutex::safepoint, name);
 540 }
 541 
 542 InstanceKlass::InstanceKlass(const ClassFileParser& parser, KlassKind kind, ReferenceType reference_type) :
 543   Klass(kind),
 544   _nest_members(nullptr),
 545   _nest_host(nullptr),
 546   _permitted_subclasses(nullptr),
 547   _record_components(nullptr),
 548   _static_field_size(parser.static_field_size()),
 549   _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
 550   _itable_len(parser.itable_size()),
 551   _nest_host_index(0),
 552   _init_state(allocated),
 553   _reference_type(reference_type),
 554   _init_monitor(create_init_monitor("InstanceKlassInitMonitor_lock")),
 555   _init_thread(nullptr),
 556   _inline_type_field_klasses(nullptr),
 557   _preload_classes(nullptr),
 558   _adr_inlineklass_fixed_block(nullptr)
 559 {
 560   set_vtable_length(parser.vtable_size());
 561   set_access_flags(parser.access_flags());
 562   if (parser.is_hidden()) set_is_hidden();
 563   set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
 564                                                     false));
 565   if (parser.has_inline_fields()) {
 566     set_has_inline_type_fields();
 567   }
 568 
 569   assert(nullptr == _methods, "underlying memory not zeroed?");
 570   assert(is_instance_klass(), "is layout incorrect?");
 571   assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
 572 
 573   if (has_inline_type_fields()) {
 574     _inline_type_field_klasses = (const Klass**) adr_inline_type_field_klasses();
 575   }
 576 }
 577 
 578 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
 579                                        Array<Method*>* methods) {
 580   if (methods != nullptr && methods != Universe::the_empty_method_array() &&
 581       !methods->is_shared()) {
 582     for (int i = 0; i < methods->length(); i++) {
 583       Method* method = methods->at(i);
 584       if (method == nullptr) continue;  // maybe null if error processing
 585       // Only want to delete methods that are not executing for RedefineClasses.
 586       // The previous version will point to them so they're not totally dangling
 587       assert (!method->on_stack(), "shouldn't be called with methods on stack");
 588       MetadataFactory::free_metadata(loader_data, method);
 589     }
 590     MetadataFactory::free_array<Method*>(loader_data, methods);
 591   }
 592 }
 593 
 594 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
 595                                           const Klass* super_klass,

 725       inner_classes() != Universe::the_empty_short_array() &&
 726       !inner_classes()->is_shared()) {
 727     MetadataFactory::free_array<jushort>(loader_data, inner_classes());
 728   }
 729   set_inner_classes(nullptr);
 730 
 731   if (nest_members() != nullptr &&
 732       nest_members() != Universe::the_empty_short_array() &&
 733       !nest_members()->is_shared()) {
 734     MetadataFactory::free_array<jushort>(loader_data, nest_members());
 735   }
 736   set_nest_members(nullptr);
 737 
 738   if (permitted_subclasses() != nullptr &&
 739       permitted_subclasses() != Universe::the_empty_short_array() &&
 740       !permitted_subclasses()->is_shared()) {
 741     MetadataFactory::free_array<jushort>(loader_data, permitted_subclasses());
 742   }
 743   set_permitted_subclasses(nullptr);
 744 
 745   if (preload_classes() != nullptr &&
 746       preload_classes() != Universe::the_empty_short_array() &&
 747       !preload_classes()->is_shared()) {
 748     MetadataFactory::free_array<jushort>(loader_data, preload_classes());
 749   }
 750 
 751   // We should deallocate the Annotations instance if it's not in shared spaces.
 752   if (annotations() != nullptr && !annotations()->is_shared()) {
 753     MetadataFactory::free_metadata(loader_data, annotations());
 754   }
 755   set_annotations(nullptr);
 756 
 757   SystemDictionaryShared::handle_class_unloading(this);
 758 
 759 #if INCLUDE_CDS_JAVA_HEAP
 760   if (DumpSharedSpaces) {
 761     HeapShared::remove_scratch_objects(this);
 762   }
 763 #endif
 764 }
 765 
 766 bool InstanceKlass::is_record() const {
 767   return _record_components != nullptr &&
 768          is_final() &&
 769          java_super() == vmClasses::Record_klass();
 770 }

 887         vmSymbols::java_lang_IncompatibleClassChangeError(),
 888         "class %s has interface %s as super class",
 889         external_name(),
 890         super_klass->external_name()
 891       );
 892       return false;
 893     }
 894 
 895     InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
 896     ik_super->link_class_impl(CHECK_false);
 897   }
 898 
 899   // link all interfaces implemented by this class before linking this class
 900   Array<InstanceKlass*>* interfaces = local_interfaces();
 901   int num_interfaces = interfaces->length();
 902   for (int index = 0; index < num_interfaces; index++) {
 903     InstanceKlass* interk = interfaces->at(index);
 904     interk->link_class_impl(CHECK_false);
 905   }
 906 
 907 
 908   // If a class declares a method that uses an inline class as an argument
 909   // type or return inline type, this inline class must be loaded during the
 910   // linking of this class because size and properties of the inline class
 911   // must be known in order to be able to perform inline type optimizations.
 912   // The implementation below is an approximation of this rule, the code
 913   // iterates over all methods of the current class (including overridden
 914   // methods), not only the methods declared by this class. This
 915   // approximation makes the code simpler, and doesn't change the semantic
 916   // because classes declaring methods overridden by the current class are
 917   // linked (and have performed their own pre-loading) before the linking
 918   // of the current class.
 919 
 920 
 921   // Note:
 922   // Inline class types are loaded during
 923   // the loading phase (see ClassFileParser::post_process_parsed_stream()).
 924   // Inline class types used as element types for array creation
 925   // are not pre-loaded. Their loading is triggered by either anewarray
 926   // or multianewarray bytecodes.
 927 
 928   // Could it be possible to do the following processing only if the
 929   // class uses inline types?
 930   if (EnableValhalla) {
 931     ResourceMark rm(THREAD);
 932     if (EnablePrimitiveClasses) {
 933       for (int i = 0; i < methods()->length(); i++) {
 934         Method* m = methods()->at(i);
 935         for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
 936           if (ss.is_reference()) {
 937             if (ss.is_array()) {
 938               continue;
 939             }
 940             if (ss.type() == T_PRIMITIVE_OBJECT) {
 941               Symbol* symb = ss.as_symbol();
 942               if (symb == name()) continue;
 943               oop loader = class_loader();
 944               oop protection_domain = this->protection_domain();
 945               Klass* klass = SystemDictionary::resolve_or_fail(symb,
 946                                                               Handle(THREAD, loader), Handle(THREAD, protection_domain), true,
 947                                                               CHECK_false);
 948               if (klass == nullptr) {
 949                 THROW_(vmSymbols::java_lang_LinkageError(), false);
 950               }
 951               if (!klass->is_inline_klass()) {
 952                 Exceptions::fthrow(
 953                   THREAD_AND_LOCATION,
 954                   vmSymbols::java_lang_IncompatibleClassChangeError(),
 955                   "class %s is not an inline type",
 956                   klass->external_name());
 957               }
 958             }
 959           }
 960         }
 961       }
 962     }
 963     // Aggressively preloading all classes from the Preload attribute
 964     if (preload_classes() != nullptr) {
 965       for (int i = 0; i < preload_classes()->length(); i++) {
 966         if (constants()->tag_at(preload_classes()->at(i)).is_klass()) continue;
 967         Symbol* class_name = constants()->klass_at_noresolve(preload_classes()->at(i));
 968         if (class_name == name()) continue;
 969         oop loader = class_loader();
 970         oop protection_domain = this->protection_domain();
 971         Klass* klass = SystemDictionary::resolve_or_null(class_name,
 972                                                           Handle(THREAD, loader), Handle(THREAD, protection_domain), THREAD);
 973         if (HAS_PENDING_EXCEPTION) {
 974           CLEAR_PENDING_EXCEPTION;
 975         }
 976         if (klass != nullptr) {
 977           log_info(class, preload)("Preloading class %s during linking of class %s because of its Preload attribute", class_name->as_C_string(), name()->as_C_string());
 978         } else {
 979           log_warning(class, preload)("Preloading of class %s during linking of class %s (Preload attribute) failed", class_name->as_C_string(), name()->as_C_string());
 980         }
 981       }
 982     }
 983   }
 984 
 985   // in case the class is linked in the process of linking its superclasses
 986   if (is_linked()) {
 987     return true;
 988   }
 989 
 990   // trace only the link time for this klass that includes
 991   // the verification time
 992   PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
 993                              ClassLoader::perf_class_link_selftime(),
 994                              ClassLoader::perf_classes_linked(),
 995                              jt->get_thread_stat()->perf_recursion_counts_addr(),
 996                              jt->get_thread_stat()->perf_timers_addr(),
 997                              PerfClassTraceTime::CLASS_LINK);
 998 
 999   // verification & rewriting
1000   {
1001     LockLinkState init_lock(this, jt);
1002 
1003     // rewritten will have been set if loader constraint error found
1004     // on an earlier link attempt

1226       set_init_thread(jt);
1227     }
1228   }
1229 
1230   // Throw error outside lock
1231   if (throw_error) {
1232     DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
1233     ResourceMark rm(THREAD);
1234     Handle cause(THREAD, get_initialization_error(THREAD));
1235 
1236     stringStream ss;
1237     ss.print("Could not initialize class %s", external_name());
1238     if (cause.is_null()) {
1239       THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), ss.as_string());
1240     } else {
1241       THROW_MSG_CAUSE(vmSymbols::java_lang_NoClassDefFoundError(),
1242                       ss.as_string(), cause);
1243     }
1244   }
1245 
1246   // Pre-allocating an instance of the default value
1247   if (is_inline_klass()) {
1248       InlineKlass* vk = InlineKlass::cast(this);
1249       oop val = vk->allocate_instance(THREAD);
1250       if (HAS_PENDING_EXCEPTION) {
1251           Handle e(THREAD, PENDING_EXCEPTION);
1252           CLEAR_PENDING_EXCEPTION;
1253           {
1254               EXCEPTION_MARK;
1255               add_initialization_error(THREAD, e);
1256               // Locks object, set state, and notify all waiting threads
1257               set_initialization_state_and_notify(initialization_error, THREAD);
1258               CLEAR_PENDING_EXCEPTION;
1259           }
1260           THROW_OOP(e());
1261       }
1262       vk->set_default_value(val);
1263   }
1264 
1265   // Step 7
1266   // Next, if C is a class rather than an interface, initialize it's super class and super
1267   // interfaces.
1268   if (!is_interface()) {
1269     Klass* super_klass = super();
1270     if (super_klass != nullptr && super_klass->should_be_initialized()) {
1271       super_klass->initialize(THREAD);
1272     }
1273     // If C implements any interface that declares a non-static, concrete method,
1274     // the initialization of C triggers initialization of its super interfaces.
1275     // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
1276     // having a superinterface that declares, non-static, concrete methods
1277     if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1278       initialize_super_interfaces(THREAD);
1279     }
1280 
1281     // If any exceptions, complete abruptly, throwing the same exception as above.
1282     if (HAS_PENDING_EXCEPTION) {
1283       Handle e(THREAD, PENDING_EXCEPTION);
1284       CLEAR_PENDING_EXCEPTION;
1285       {
1286         EXCEPTION_MARK;
1287         add_initialization_error(THREAD, e);
1288         // Locks object, set state, and notify all waiting threads
1289         set_initialization_state_and_notify(initialization_error, THREAD);
1290         CLEAR_PENDING_EXCEPTION;
1291       }
1292       DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1293       THROW_OOP(e());
1294     }
1295   }
1296 

1297   // Step 8
1298   // Initialize classes of inline fields
1299   if (EnablePrimitiveClasses) {
1300     for (AllFieldStream fs(this); !fs.done(); fs.next()) {
1301       if (fs.is_null_free_inline_type()) {
1302         Klass* klass = get_inline_type_field_klass_or_null(fs.index());
1303         if (fs.access_flags().is_static() && klass == nullptr) {
1304           klass = SystemDictionary::resolve_or_fail(field_signature(fs.index())->fundamental_name(THREAD),
1305               Handle(THREAD, class_loader()),
1306               Handle(THREAD, protection_domain()),
1307               true, THREAD);
1308           set_inline_type_field_klass(fs.index(), klass);
1309         }
1310 
1311         if (!HAS_PENDING_EXCEPTION) {
1312           assert(klass != nullptr, "Must  be");
1313           InstanceKlass::cast(klass)->initialize(THREAD);
1314           if (fs.access_flags().is_static()) {
1315             if (java_mirror()->obj_field(fs.offset()) == nullptr) {
1316               java_mirror()->obj_field_put(fs.offset(), InlineKlass::cast(klass)->default_value());
1317             }
1318           }
1319         }
1320 
1321         if (HAS_PENDING_EXCEPTION) {
1322           Handle e(THREAD, PENDING_EXCEPTION);
1323           CLEAR_PENDING_EXCEPTION;
1324           {
1325             EXCEPTION_MARK;
1326             add_initialization_error(THREAD, e);
1327             // Locks object, set state, and notify all waiting threads
1328             set_initialization_state_and_notify(initialization_error, THREAD);
1329             CLEAR_PENDING_EXCEPTION;
1330           }
1331           THROW_OOP(e());
1332         }
1333       }
1334     }
1335   }
1336 
1337 
1338   // Step 9
1339   {
1340     DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1341     if (class_initializer() != nullptr) {
1342       // Timer includes any side effects of class initialization (resolution,
1343       // etc), but not recursive entry into call_class_initializer().
1344       PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1345                                ClassLoader::perf_class_init_selftime(),
1346                                ClassLoader::perf_classes_inited(),
1347                                jt->get_thread_stat()->perf_recursion_counts_addr(),
1348                                jt->get_thread_stat()->perf_timers_addr(),
1349                                PerfClassTraceTime::CLASS_CLINIT);
1350       call_class_initializer(THREAD);
1351     } else {
1352       // The elapsed time is so small it's not worth counting.
1353       if (UsePerfData) {
1354         ClassLoader::perf_classes_inited()->inc();
1355       }
1356       call_class_initializer(THREAD);
1357     }
1358   }
1359 
1360   // Step 10
1361   if (!HAS_PENDING_EXCEPTION) {
1362     set_initialization_state_and_notify(fully_initialized, THREAD);
1363     debug_only(vtable().verify(tty, true);)
1364   }
1365   else {
1366     // Step 11 and 12
1367     Handle e(THREAD, PENDING_EXCEPTION);
1368     CLEAR_PENDING_EXCEPTION;
1369     // JVMTI has already reported the pending exception
1370     // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1371     JvmtiExport::clear_detected_exception(jt);
1372     {
1373       EXCEPTION_MARK;
1374       add_initialization_error(THREAD, e);
1375       set_initialization_state_and_notify(initialization_error, THREAD);
1376       CLEAR_PENDING_EXCEPTION;   // ignore any exception thrown, class initialization error is thrown below
1377       // JVMTI has already reported the pending exception
1378       // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1379       JvmtiExport::clear_detected_exception(jt);
1380     }
1381     DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1382     if (e->is_a(vmClasses::Error_klass())) {
1383       THROW_OOP(e());
1384     } else {
1385       JavaCallArguments args(e);
1386       THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),

1672               : vmSymbols::java_lang_InstantiationException(), external_name());
1673   }
1674   if (this == vmClasses::Class_klass()) {
1675     ResourceMark rm(THREAD);
1676     THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1677               : vmSymbols::java_lang_IllegalAccessException(), external_name());
1678   }
1679 }
1680 
1681 Klass* InstanceKlass::array_klass(int n, TRAPS) {
1682   // Need load-acquire for lock-free read
1683   if (array_klasses_acquire() == nullptr) {
1684     ResourceMark rm(THREAD);
1685     JavaThread *jt = THREAD;
1686     {
1687       // Atomic creation of array_klasses
1688       MutexLocker ma(THREAD, MultiArray_lock);
1689 
1690       // Check if update has already taken place
1691       if (array_klasses() == nullptr) {
1692         ObjArrayKlass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this,
1693                                                                   false, false, CHECK_NULL);
1694         // use 'release' to pair with lock-free load
1695         release_set_array_klasses(k);
1696       }
1697     }
1698   }
1699   // array_klasses() will always be set at this point
1700   ArrayKlass* ak = array_klasses();
1701   return ak->array_klass(n, THREAD);
1702 }
1703 
1704 Klass* InstanceKlass::array_klass_or_null(int n) {
1705   // Need load-acquire for lock-free read
1706   ArrayKlass* ak = array_klasses_acquire();
1707   if (ak == nullptr) {
1708     return nullptr;
1709   } else {
1710     return ak->array_klass_or_null(n);
1711   }
1712 }
1713 
1714 Klass* InstanceKlass::array_klass(TRAPS) {
1715   return array_klass(1, THREAD);
1716 }
1717 
1718 Klass* InstanceKlass::array_klass_or_null() {
1719   return array_klass_or_null(1);
1720 }
1721 
1722 static int call_class_initializer_counter = 0;   // for debugging
1723 
1724 Method* InstanceKlass::class_initializer() const {
1725   Method* clinit = find_method(
1726       vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1727   if (clinit != nullptr && clinit->is_class_initializer()) {
1728     return clinit;
1729   }
1730   return nullptr;
1731 }
1732 
1733 void InstanceKlass::call_class_initializer(TRAPS) {
1734   if (ReplayCompiles &&
1735       (ReplaySuppressInitializers == 1 ||
1736        (ReplaySuppressInitializers >= 2 && class_loader() != nullptr))) {
1737     // Hide the existence of the initializer for the purpose of replaying the compile
1738     return;
1739   }
1740 
1741 #if INCLUDE_CDS
1742   // This is needed to ensure the consistency of the archived heap objects.
1743   if (has_archived_enum_objs()) {
1744     assert(is_shared(), "must be");
1745     bool initialized = HeapShared::initialize_enum_klass(this, CHECK);
1746     if (initialized) {
1747       return;

1756     ResourceMark rm(THREAD);
1757     LogStream ls(lt);
1758     ls.print("%d Initializing ", call_class_initializer_counter++);
1759     name()->print_value_on(&ls);
1760     ls.print_cr("%s (" PTR_FORMAT ")", h_method() == nullptr ? "(no method)" : "", p2i(this));
1761   }
1762   if (h_method() != nullptr) {
1763     JavaCallArguments args; // No arguments
1764     JavaValue result(T_VOID);
1765     JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1766   }
1767 }
1768 
1769 
1770 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1771   InterpreterOopMap* entry_for) {
1772   // Lazily create the _oop_map_cache at first request
1773   // Lock-free access requires load_acquire.
1774   OopMapCache* oop_map_cache = Atomic::load_acquire(&_oop_map_cache);
1775   if (oop_map_cache == nullptr) {
1776     MutexLocker x(OopMapCacheAlloc_lock,  Mutex::_no_safepoint_check_flag);
1777     // Check if _oop_map_cache was allocated while we were waiting for this lock
1778     if ((oop_map_cache = _oop_map_cache) == nullptr) {
1779       oop_map_cache = new OopMapCache();
1780       // Ensure _oop_map_cache is stable, since it is examined without a lock
1781       Atomic::release_store(&_oop_map_cache, oop_map_cache);
1782     }
1783   }
1784   // _oop_map_cache is constant after init; lookup below does its own locking.
1785   oop_map_cache->lookup(method, bci, entry_for);
1786 }
1787 




1788 
1789 FieldInfo InstanceKlass::field(int index) const {
1790   for (AllFieldStream fs(this); !fs.done(); fs.next()) {
1791     if (fs.index() == index) {
1792       return fs.to_FieldInfo();
1793     }
1794   }
1795   fatal("Field not found");
1796   return FieldInfo();
1797 }
1798 
1799 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1800   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1801     Symbol* f_name = fs.name();
1802     Symbol* f_sig  = fs.signature();
1803     if (f_name == name && f_sig == sig) {
1804       fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1805       return true;
1806     }
1807   }

1849 
1850 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1851   // search order according to newest JVM spec (5.4.3.2, p.167).
1852   // 1) search for field in current klass
1853   if (find_local_field(name, sig, fd)) {
1854     if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1855   }
1856   // 2) search for field recursively in direct superinterfaces
1857   if (is_static) {
1858     Klass* intf = find_interface_field(name, sig, fd);
1859     if (intf != nullptr) return intf;
1860   }
1861   // 3) apply field lookup recursively if superclass exists
1862   { Klass* supr = super();
1863     if (supr != nullptr) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
1864   }
1865   // 4) otherwise field lookup fails
1866   return nullptr;
1867 }
1868 
1869 bool InstanceKlass::contains_field_offset(int offset) {
1870   if (this->is_inline_klass()) {
1871     InlineKlass* vk = InlineKlass::cast(this);
1872     return offset >= vk->first_field_offset() && offset < (vk->first_field_offset() + vk->get_exact_size_in_bytes());
1873   } else {
1874     fieldDescriptor fd;
1875     return find_field_from_offset(offset, false, &fd);
1876   }
1877 }
1878 
1879 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1880   for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1881     if (fs.offset() == offset) {
1882       fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1883       if (fd->is_static() == is_static) return true;
1884     }
1885   }
1886   return false;
1887 }
1888 
1889 
1890 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1891   Klass* klass = const_cast<InstanceKlass*>(this);
1892   while (klass != nullptr) {
1893     if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
1894       return true;
1895     }
1896     klass = klass->super();
1897   }

2250 }
2251 
2252 // uncached_lookup_method searches both the local class methods array and all
2253 // superclasses methods arrays, skipping any overpass methods in superclasses,
2254 // and possibly skipping private methods.
2255 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
2256                                               const Symbol* signature,
2257                                               OverpassLookupMode overpass_mode,
2258                                               PrivateLookupMode private_mode) const {
2259   OverpassLookupMode overpass_local_mode = overpass_mode;
2260   const Klass* klass = this;
2261   while (klass != nullptr) {
2262     Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
2263                                                                         signature,
2264                                                                         overpass_local_mode,
2265                                                                         StaticLookupMode::find,
2266                                                                         private_mode);
2267     if (method != nullptr) {
2268       return method;
2269     }
2270     if (name == vmSymbols::object_initializer_name() ||
2271         name == vmSymbols::inline_factory_name()) {
2272       break;  // <init> and <vnew> is never inherited
2273     }
2274     klass = klass->super();
2275     overpass_local_mode = OverpassLookupMode::skip;   // Always ignore overpass methods in superclasses
2276   }
2277   return nullptr;
2278 }
2279 
2280 #ifdef ASSERT
2281 // search through class hierarchy and return true if this class or
2282 // one of the superclasses was redefined
2283 bool InstanceKlass::has_redefined_this_or_super() const {
2284   const Klass* klass = this;
2285   while (klass != nullptr) {
2286     if (InstanceKlass::cast(klass)->has_been_redefined()) {
2287       return true;
2288     }
2289     klass = klass->super();
2290   }
2291   return false;
2292 }
2293 #endif

2734     int method_table_offset_in_words = ioe->offset()/wordSize;
2735     int itable_offset_in_words = (int)(start_of_itable() - (intptr_t*)this);
2736 
2737     int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words)
2738                          / itableOffsetEntry::size();
2739 
2740     for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2741       if (ioe->interface_klass() != nullptr) {
2742         it->push(ioe->interface_klass_addr());
2743         itableMethodEntry* ime = ioe->first_method_entry(this);
2744         int n = klassItable::method_count_for_interface(ioe->interface_klass());
2745         for (int index = 0; index < n; index ++) {
2746           it->push(ime[index].method_addr());
2747         }
2748       }
2749     }
2750   }
2751 
2752   it->push(&_nest_members);
2753   it->push(&_permitted_subclasses);
2754   it->push(&_preload_classes);
2755   it->push(&_record_components);
2756 
2757   if (has_inline_type_fields()) {
2758     for (int i = 0; i < java_fields_count(); i++) {
2759       it->push(&((Klass**)adr_inline_type_field_klasses())[i]);
2760     }
2761   }
2762 }
2763 
2764 #if INCLUDE_CDS
2765 void InstanceKlass::remove_unshareable_info() {
2766 
2767   if (is_linked()) {
2768     assert(can_be_verified_at_dumptime(), "must be");
2769     // Remember this so we can avoid walking the hierarchy at runtime.
2770     set_verified_at_dump_time();
2771   }
2772 
2773   Klass::remove_unshareable_info();
2774 
2775   if (SystemDictionaryShared::has_class_failed_verification(this)) {
2776     // Classes are attempted to link during dumping and may fail,
2777     // but these classes are still in the dictionary and class list in CLD.
2778     // If the class has failed verification, there is nothing else to remove.
2779     return;
2780   }
2781 

2785   // being added to class hierarchy (see InstanceKlass:::add_to_hierarchy()).
2786   _init_state = allocated;
2787 
2788   { // Otherwise this needs to take out the Compile_lock.
2789     assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2790     init_implementor();
2791   }
2792 
2793   constants()->remove_unshareable_info();
2794 
2795   for (int i = 0; i < methods()->length(); i++) {
2796     Method* m = methods()->at(i);
2797     m->remove_unshareable_info();
2798   }
2799 
2800   // do array classes also.
2801   if (array_klasses() != nullptr) {
2802     array_klasses()->remove_unshareable_info();
2803   }
2804 
2805   if (has_inline_type_fields()) {
2806     for (AllFieldStream fs(this); !fs.done(); fs.next()) {
2807       if (fs.is_null_free_inline_type()) {
2808         reset_inline_type_field_klass(fs.index());
2809       }
2810     }
2811   }
2812 
2813   // These are not allocated from metaspace. They are safe to set to nullptr.
2814   _source_debug_extension = nullptr;
2815   _dep_context = nullptr;
2816   _osr_nmethods_head = nullptr;
2817 #if INCLUDE_JVMTI
2818   _breakpoints = nullptr;
2819   _previous_versions = nullptr;
2820   _cached_class_file = nullptr;
2821   _jvmti_cached_class_field_map = nullptr;
2822 #endif
2823 
2824   _init_thread = nullptr;
2825   _methods_jmethod_ids = nullptr;
2826   _jni_ids = nullptr;
2827   _oop_map_cache = nullptr;
2828   // clear _nest_host to ensure re-load at runtime
2829   _nest_host = nullptr;
2830   init_shared_package_entry();
2831   _dep_context_last_cleaned = 0;
2832   _init_monitor = nullptr;
2833 

2877 void InstanceKlass::compute_has_loops_flag_for_methods() {
2878   Array<Method*>* methods = this->methods();
2879   for (int index = 0; index < methods->length(); ++index) {
2880     Method* m = methods->at(index);
2881     if (!m->is_overpass()) { // work around JDK-8305771
2882       m->compute_has_loops_flag();
2883     }
2884   }
2885 }
2886 
2887 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain,
2888                                              PackageEntry* pkg_entry, TRAPS) {
2889   // InstanceKlass::add_to_hierarchy() sets the init_state to loaded
2890   // before the InstanceKlass is added to the SystemDictionary. Make
2891   // sure the current state is <loaded.
2892   assert(!is_loaded(), "invalid init state");
2893   assert(!shared_loading_failed(), "Must not try to load failed class again");
2894   set_package(loader_data, pkg_entry, CHECK);
2895   Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2896 
2897   if (is_inline_klass()) {
2898     InlineKlass::cast(this)->initialize_calling_convention(CHECK);
2899   }
2900 
2901   Array<Method*>* methods = this->methods();
2902   int num_methods = methods->length();
2903   for (int index = 0; index < num_methods; ++index) {
2904     methods->at(index)->restore_unshareable_info(CHECK);
2905   }
2906 #if INCLUDE_JVMTI
2907   if (JvmtiExport::has_redefined_a_class()) {
2908     // Reinitialize vtable because RedefineClasses may have changed some
2909     // entries in this vtable for super classes so the CDS vtable might
2910     // point to old or obsolete entries.  RedefineClasses doesn't fix up
2911     // vtables in the shared system dictionary, only the main one.
2912     // It also redefines the itable too so fix that too.
2913     // First fix any default methods that point to a super class that may
2914     // have been redefined.
2915     bool trace_name_printed = false;
2916     adjust_default_methods(&trace_name_printed);
2917     vtable().initialize_vtable();
2918     itable().initialize_itable();
2919   }
2920 #endif

3107   } else {
3108     // Adding one to the attribute length in order to store a null terminator
3109     // character could cause an overflow because the attribute length is
3110     // already coded with an u4 in the classfile, but in practice, it's
3111     // unlikely to happen.
3112     assert((length+1) > length, "Overflow checking");
3113     char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
3114     for (int i = 0; i < length; i++) {
3115       sde[i] = array[i];
3116     }
3117     sde[length] = '\0';
3118     _source_debug_extension = sde;
3119   }
3120 }
3121 
3122 Symbol* InstanceKlass::generic_signature() const                   { return _constants->generic_signature(); }
3123 u2 InstanceKlass::generic_signature_index() const                  { return _constants->generic_signature_index(); }
3124 void InstanceKlass::set_generic_signature_index(u2 sig_index)      { _constants->set_generic_signature_index(sig_index); }
3125 
3126 const char* InstanceKlass::signature_name() const {
3127   return signature_name_of_carrier(JVM_SIGNATURE_CLASS);
3128 }
3129 
3130 const char* InstanceKlass::signature_name_of_carrier(char c) const {
3131   // Get the internal name as a c string
3132   const char* src = (const char*) (name()->as_C_string());
3133   const int src_length = (int)strlen(src);
3134 
3135   char* dest = NEW_RESOURCE_ARRAY(char, src_length + 3);
3136 
3137   // Add L or Q as type indicator
3138   int dest_index = 0;
3139   dest[dest_index++] = c;
3140 
3141   // Add the actual class name
3142   for (int src_index = 0; src_index < src_length; ) {
3143     dest[dest_index++] = src[src_index++];
3144   }
3145 
3146   if (is_hidden()) { // Replace the last '+' with a '.'.
3147     for (int index = (int)src_length; index > 0; index--) {
3148       if (dest[index] == '+') {
3149         dest[index] = JVM_SIGNATURE_DOT;
3150         break;
3151       }
3152     }
3153   }
3154 
3155   // Add the semicolon and the null
3156   dest[dest_index++] = JVM_SIGNATURE_ENDCLASS;
3157   dest[dest_index] = '\0';
3158   return dest;
3159 }

3461 jint InstanceKlass::compute_modifier_flags() const {
3462   jint access = access_flags().as_int();
3463 
3464   // But check if it happens to be member class.
3465   InnerClassesIterator iter(this);
3466   for (; !iter.done(); iter.next()) {
3467     int ioff = iter.inner_class_info_index();
3468     // Inner class attribute can be zero, skip it.
3469     // Strange but true:  JVM spec. allows null inner class refs.
3470     if (ioff == 0) continue;
3471 
3472     // only look at classes that are already loaded
3473     // since we are looking for the flags for our self.
3474     Symbol* inner_name = constants()->klass_name_at(ioff);
3475     if (name() == inner_name) {
3476       // This is really a member class.
3477       access = iter.inner_access_flags();
3478       break;
3479     }
3480   }
3481   return (access & JVM_ACC_WRITTEN_FLAGS);

3482 }
3483 
3484 jint InstanceKlass::jvmti_class_status() const {
3485   jint result = 0;
3486 
3487   if (is_linked()) {
3488     result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3489   }
3490 
3491   if (is_initialized()) {
3492     assert(is_linked(), "Class status is not consistent");
3493     result |= JVMTI_CLASS_STATUS_INITIALIZED;
3494   }
3495   if (is_in_error_state()) {
3496     result |= JVMTI_CLASS_STATUS_ERROR;
3497   }
3498   return result;
3499 }
3500 
3501 Method* InstanceKlass::method_at_itable(InstanceKlass* holder, int index, TRAPS) {

3718     }
3719     osr = osr->osr_link();
3720   }
3721 
3722   assert(match_level == false || best == nullptr, "shouldn't pick up anything if match_level is set");
3723   if (best != nullptr && best->comp_level() >= comp_level) {
3724     return best;
3725   }
3726   return nullptr;
3727 }
3728 
3729 // -----------------------------------------------------------------------------------------------------
3730 // Printing
3731 
3732 #define BULLET  " - "
3733 
3734 static const char* state_names[] = {
3735   "allocated", "loaded", "being_linked", "linked", "being_initialized", "fully_initialized", "initialization_error"
3736 };
3737 
3738 static void print_vtable(address self, intptr_t* start, int len, outputStream* st) {
3739   ResourceMark rm;
3740   int* forward_refs = NEW_RESOURCE_ARRAY(int, len);
3741   for (int i = 0; i < len; i++)  forward_refs[i] = 0;
3742   for (int i = 0; i < len; i++) {
3743     intptr_t e = start[i];
3744     st->print("%d : " INTPTR_FORMAT, i, e);
3745     if (forward_refs[i] != 0) {
3746       int from = forward_refs[i];
3747       int off = (int) start[from];
3748       st->print(" (offset %d <= [%d])", off, from);
3749     }
3750     if (MetaspaceObj::is_valid((Metadata*)e)) {
3751       st->print(" ");
3752       ((Metadata*)e)->print_value_on(st);
3753     } else if (self != nullptr && e > 0 && e < 0x10000) {
3754       address location = self + e;
3755       int index = (int)((intptr_t*)location - start);
3756       st->print(" (offset %d => [%d])", (int)e, index);
3757       if (index >= 0 && index < len)
3758         forward_refs[index] = i;
3759     }
3760     st->cr();
3761   }
3762 }
3763 
3764 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3765   return print_vtable(nullptr, reinterpret_cast<intptr_t*>(start), len, st);
3766 }
3767 
3768 template<typename T>
3769  static void print_array_on(outputStream* st, Array<T>* array) {
3770    if (array == nullptr) { st->print_cr("nullptr"); return; }
3771    array->print_value_on(st); st->cr();
3772    if (Verbose || WizardMode) {
3773      for (int i = 0; i < array->length(); i++) {
3774        st->print("%d : ", i); array->at(i)->print_value_on(st); st->cr();
3775      }
3776    }
3777  }
3778 
3779 static void print_array_on(outputStream* st, Array<int>* array) {
3780   if (array == nullptr) { st->print_cr("nullptr"); return; }
3781   array->print_value_on(st); st->cr();
3782   if (Verbose || WizardMode) {
3783     for (int i = 0; i < array->length(); i++) {
3784       st->print("%d : %d", i, array->at(i)); st->cr();
3785     }
3786   }
3787 }
3788 
3789 const char* InstanceKlass::init_state_name() const {
3790   return state_names[init_state()];
3791 }
3792 
3793 void InstanceKlass::print_on(outputStream* st) const {
3794   assert(is_klass(), "must be klass");
3795   Klass::print_on(st);
3796 
3797   st->print(BULLET"instance size:     %d", size_helper());                        st->cr();
3798   st->print(BULLET"klass size:        %d", size());                               st->cr();
3799   st->print(BULLET"access:            "); access_flags().print_on(st);            st->cr();
3800   st->print(BULLET"flags:             "); _misc_flags.print_on(st);               st->cr();
3801   st->print(BULLET"state:             "); st->print_cr("%s", init_state_name());
3802   st->print(BULLET"name:              "); name()->print_value_on(st);             st->cr();
3803   st->print(BULLET"super:             "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3804   st->print(BULLET"sub:               ");
3805   Klass* sub = subklass();
3806   int n;
3807   for (n = 0; sub != nullptr; n++, sub = sub->next_sibling()) {
3808     if (n < MaxSubklassPrintSize) {
3809       sub->print_value_on(st);
3810       st->print("   ");
3811     }
3812   }
3813   if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
3814   st->cr();
3815 
3816   if (is_interface()) {
3817     st->print_cr(BULLET"nof implementors:  %d", nof_implementors());
3818     if (nof_implementors() == 1) {
3819       st->print_cr(BULLET"implementor:    ");
3820       st->print("   ");
3821       implementor()->print_value_on(st);
3822       st->cr();
3823     }
3824   }
3825 
3826   st->print(BULLET"arrays:            "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3827   st->print(BULLET"methods:           "); print_array_on(st, methods());
3828   st->print(BULLET"method ordering:   "); print_array_on(st, method_ordering());
3829   st->print(BULLET"default_methods:   "); print_array_on(st, default_methods());












3830   if (default_vtable_indices() != nullptr) {
3831     st->print(BULLET"default vtable indices:   "); print_array_on(st, default_vtable_indices());
3832   }
3833   st->print(BULLET"local interfaces:  "); print_array_on(st, local_interfaces());
3834   st->print(BULLET"trans. interfaces: "); print_array_on(st, transitive_interfaces());
3835   st->print(BULLET"constants:         "); constants()->print_value_on(st);         st->cr();
3836   if (class_loader_data() != nullptr) {
3837     st->print(BULLET"class loader data:  ");
3838     class_loader_data()->print_value_on(st);
3839     st->cr();
3840   }
3841   if (source_file_name() != nullptr) {
3842     st->print(BULLET"source file:       ");
3843     source_file_name()->print_value_on(st);
3844     st->cr();
3845   }
3846   if (source_debug_extension() != nullptr) {
3847     st->print(BULLET"source debug extension:       ");
3848     st->print("%s", source_debug_extension());
3849     st->cr();
3850   }
3851   st->print(BULLET"class annotations:       "); class_annotations()->print_value_on(st); st->cr();
3852   st->print(BULLET"class type annotations:  "); class_type_annotations()->print_value_on(st); st->cr();
3853   st->print(BULLET"field annotations:       "); fields_annotations()->print_value_on(st); st->cr();
3854   st->print(BULLET"field type annotations:  "); fields_type_annotations()->print_value_on(st); st->cr();

3860          pv_node = pv_node->previous_versions()) {
3861       if (!have_pv)
3862         st->print(BULLET"previous version:  ");
3863       have_pv = true;
3864       pv_node->constants()->print_value_on(st);
3865     }
3866     if (have_pv) st->cr();
3867   }
3868 
3869   if (generic_signature() != nullptr) {
3870     st->print(BULLET"generic signature: ");
3871     generic_signature()->print_value_on(st);
3872     st->cr();
3873   }
3874   st->print(BULLET"inner classes:     "); inner_classes()->print_value_on(st);     st->cr();
3875   st->print(BULLET"nest members:     "); nest_members()->print_value_on(st);     st->cr();
3876   if (record_components() != nullptr) {
3877     st->print(BULLET"record components:     "); record_components()->print_value_on(st);     st->cr();
3878   }
3879   st->print(BULLET"permitted subclasses:     "); permitted_subclasses()->print_value_on(st);     st->cr();
3880   st->print(BULLET"preload classes:     "); preload_classes()->print_value_on(st); st->cr();
3881   if (java_mirror() != nullptr) {
3882     st->print(BULLET"java mirror:       ");
3883     java_mirror()->print_value_on(st);
3884     st->cr();
3885   } else {
3886     st->print_cr(BULLET"java mirror:       null");
3887   }
3888   st->print(BULLET"vtable length      %d  (start addr: " PTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3889   if (vtable_length() > 0 && (Verbose || WizardMode))  print_vtable(start_of_vtable(), vtable_length(), st);
3890   st->print(BULLET"itable length      %d (start addr: " PTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3891   if (itable_length() > 0 && (Verbose || WizardMode))  print_vtable(nullptr, start_of_itable(), itable_length(), st);
3892   st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3893   FieldPrinter print_static_field(st);
3894   ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3895   st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3896   FieldPrinter print_nonstatic_field(st);
3897   InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3898   ik->print_nonstatic_fields(&print_nonstatic_field);
3899 
3900   st->print(BULLET"non-static oop maps: ");
3901   OopMapBlock* map     = start_of_nonstatic_oop_maps();
3902   OopMapBlock* end_map = map + nonstatic_oop_map_count();
3903   while (map < end_map) {
3904     st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3905     map++;
3906   }
3907   st->cr();
3908 }
3909 
3910 void InstanceKlass::print_value_on(outputStream* st) const {
3911   assert(is_klass(), "must be klass");
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