221 u2 _nest_host_index;
222 u2 _this_class_index; // constant pool entry
223 u2 _static_oop_field_count; // number of static oop fields in this klass
224
225 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
226
227 // Class states are defined as ClassState (see above).
228 // Place the _init_state here to utilize the unused 2-byte after
229 // _idnum_allocated_count.
230 volatile ClassState _init_state; // state of class
231
232 u1 _reference_type; // reference type
233
234 AccessFlags _access_flags; // Access flags. The class/interface distinction is stored here.
235
236 // State is set either at parse time or while executing, atomically to not disturb other state
237 InstanceKlassFlags _misc_flags;
238
239 JavaThread* volatile _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization)
240
241 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
242 JNIid* _jni_ids; // First JNI identifier for static fields in this class
243 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or null if none
244 nmethodBucket* volatile _dep_context; // packed DependencyContext structure
245 uint64_t volatile _dep_context_last_cleaned;
246 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
247 #if INCLUDE_JVMTI
248 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
249 // Linked instanceKlasses of previous versions
250 InstanceKlass* _previous_versions;
251 // JVMTI fields can be moved to their own structure - see 6315920
252 // JVMTI: cached class file, before retransformable agent modified it in CFLH
253 JvmtiCachedClassFileData* _cached_class_file;
254 #endif
255
256 #if INCLUDE_JVMTI
257 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
258 #endif
259
260 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
889 // check whether this class or one of its superclasses was redefined
890 bool has_redefined_this_or_super() const;
891 #endif
892
893 // Access to the implementor of an interface.
894 InstanceKlass* implementor() const;
895 void set_implementor(InstanceKlass* ik);
896 int nof_implementors() const;
897 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface
898 void init_implementor(); // initialize
899
900 private:
901 // link this class into the implementors list of every interface it implements
902 void process_interfaces();
903
904 public:
905 // virtual operations from Klass
906 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
907 Array<InstanceKlass*>* transitive_interfaces) override;
908 bool can_be_primary_super_slow() const override;
909 size_t oop_size(oop obj) const override { return size_helper(); }
910 // slow because it's a virtual call and used for verifying the layout_helper.
911 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
912 DEBUG_ONLY(bool is_instance_klass_slow() const override { return true; })
913
914 // Iterators
915 void do_local_static_fields(FieldClosure* cl);
916 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
917 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
918 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields
919
920 void methods_do(void f(Method* method));
921
922 static InstanceKlass* cast(Klass* k) {
923 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
924 }
925
926 static const InstanceKlass* cast(const Klass* k) {
927 assert(k != nullptr, "k should not be null");
928 assert(k->is_instance_klass(), "cast to InstanceKlass");
929 return static_cast<const InstanceKlass*>(k);
956 itable_length(),
957 nonstatic_oop_map_size(),
958 is_interface());
959 }
960
961
962 inline intptr_t* start_of_itable() const;
963 inline intptr_t* end_of_itable() const;
964 inline oop static_field_base_raw();
965
966 inline OopMapBlock* start_of_nonstatic_oop_maps() const;
967 inline Klass** end_of_nonstatic_oop_maps() const;
968
969 inline InstanceKlass* volatile* adr_implementor() const;
970
971 // Use this to return the size of an instance in heap words:
972 int size_helper() const {
973 return layout_helper_to_size_helper(layout_helper());
974 }
975
976 // This bit is initialized in classFileParser.cpp.
977 // It is false under any of the following conditions:
978 // - the class is abstract (including any interface)
979 // - the class size is larger than FastAllocateSizeLimit
980 // - the class is java/lang/Class, which cannot be allocated directly
981 bool can_be_fastpath_allocated() const {
982 return !layout_helper_needs_slow_path(layout_helper());
983 }
984
985 // Java itable
986 klassItable itable() const; // return klassItable wrapper
987 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS);
988 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found);
989 int vtable_index_of_interface_method(Method* method);
990
991 #if INCLUDE_JVMTI
992 void adjust_default_methods(bool* trace_name_printed);
993 #endif // INCLUDE_JVMTI
994
995 void clean_weak_instanceklass_links();
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221 u2 _nest_host_index;
222 u2 _this_class_index; // constant pool entry
223 u2 _static_oop_field_count; // number of static oop fields in this klass
224
225 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
226
227 // Class states are defined as ClassState (see above).
228 // Place the _init_state here to utilize the unused 2-byte after
229 // _idnum_allocated_count.
230 volatile ClassState _init_state; // state of class
231
232 u1 _reference_type; // reference type
233
234 AccessFlags _access_flags; // Access flags. The class/interface distinction is stored here.
235
236 // State is set either at parse time or while executing, atomically to not disturb other state
237 InstanceKlassFlags _misc_flags;
238
239 JavaThread* volatile _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization)
240
241 int _hash_offset; // Offset of hidden field for i-hash
242
243 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
244 JNIid* _jni_ids; // First JNI identifier for static fields in this class
245 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or null if none
246 nmethodBucket* volatile _dep_context; // packed DependencyContext structure
247 uint64_t volatile _dep_context_last_cleaned;
248 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
249 #if INCLUDE_JVMTI
250 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
251 // Linked instanceKlasses of previous versions
252 InstanceKlass* _previous_versions;
253 // JVMTI fields can be moved to their own structure - see 6315920
254 // JVMTI: cached class file, before retransformable agent modified it in CFLH
255 JvmtiCachedClassFileData* _cached_class_file;
256 #endif
257
258 #if INCLUDE_JVMTI
259 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
260 #endif
261
262 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
891 // check whether this class or one of its superclasses was redefined
892 bool has_redefined_this_or_super() const;
893 #endif
894
895 // Access to the implementor of an interface.
896 InstanceKlass* implementor() const;
897 void set_implementor(InstanceKlass* ik);
898 int nof_implementors() const;
899 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface
900 void init_implementor(); // initialize
901
902 private:
903 // link this class into the implementors list of every interface it implements
904 void process_interfaces();
905
906 public:
907 // virtual operations from Klass
908 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
909 Array<InstanceKlass*>* transitive_interfaces) override;
910 bool can_be_primary_super_slow() const override;
911 size_t oop_size(oop obj, markWord mark) const override { return size_helper(); }
912 // slow because it's a virtual call and used for verifying the layout_helper.
913 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
914 DEBUG_ONLY(bool is_instance_klass_slow() const override { return true; })
915
916 // Iterators
917 void do_local_static_fields(FieldClosure* cl);
918 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
919 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
920 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields
921
922 void methods_do(void f(Method* method));
923
924 static InstanceKlass* cast(Klass* k) {
925 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
926 }
927
928 static const InstanceKlass* cast(const Klass* k) {
929 assert(k != nullptr, "k should not be null");
930 assert(k->is_instance_klass(), "cast to InstanceKlass");
931 return static_cast<const InstanceKlass*>(k);
958 itable_length(),
959 nonstatic_oop_map_size(),
960 is_interface());
961 }
962
963
964 inline intptr_t* start_of_itable() const;
965 inline intptr_t* end_of_itable() const;
966 inline oop static_field_base_raw();
967
968 inline OopMapBlock* start_of_nonstatic_oop_maps() const;
969 inline Klass** end_of_nonstatic_oop_maps() const;
970
971 inline InstanceKlass* volatile* adr_implementor() const;
972
973 // Use this to return the size of an instance in heap words:
974 int size_helper() const {
975 return layout_helper_to_size_helper(layout_helper());
976 }
977
978 virtual int hash_offset_in_bytes(oop obj, markWord m) const override {
979 assert(UseCompactObjectHeaders, "only with compact i-hash");
980 return _hash_offset;
981 }
982 static int hash_offset_offset_in_bytes() {
983 assert(UseCompactObjectHeaders, "only with compact i-hash");
984 return (int)offset_of(InstanceKlass, _hash_offset);
985 }
986
987 // This bit is initialized in classFileParser.cpp.
988 // It is false under any of the following conditions:
989 // - the class is abstract (including any interface)
990 // - the class size is larger than FastAllocateSizeLimit
991 // - the class is java/lang/Class, which cannot be allocated directly
992 bool can_be_fastpath_allocated() const {
993 return !layout_helper_needs_slow_path(layout_helper());
994 }
995
996 // Java itable
997 klassItable itable() const; // return klassItable wrapper
998 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS);
999 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found);
1000 int vtable_index_of_interface_method(Method* method);
1001
1002 #if INCLUDE_JVMTI
1003 void adjust_default_methods(bool* trace_name_printed);
1004 #endif // INCLUDE_JVMTI
1005
1006 void clean_weak_instanceklass_links();
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