203 Symbol* _source_file_name;
204 // the source debug extension for this klass, NULL if not specified.
205 // Specified as UTF-8 string without terminating zero byte in the classfile,
206 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
207 char* _source_debug_extension;
208 // Generic signature, or null if none.
209 Symbol* _generic_signature;
210 // Array name derived from this class which needs unreferencing
211 // if this class is unloaded.
212 Symbol* _array_name;
213
214 // Number of heapOopSize words used by non-static fields in this klass
215 // (including inherited fields but after header_size()).
216 int _nonstatic_field_size;
217 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
218 u2 _static_oop_field_count;// number of static oop fields in this klass
219 u2 _java_fields_count; // The number of declared Java fields
220 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
221
222 bool _is_marked_dependent; // used for marking during flushing and deoptimization
223 enum {
224 _misc_rewritten = 1 << 0, // methods rewritten.
225 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
226 _misc_should_verify_class = 1 << 2, // allow caching of preverification
227 _misc_is_anonymous = 1 << 3 // has embedded _inner_classes field
228 };
229 u2 _misc_flags;
230 u2 _minor_version; // minor version number of class file
231 u2 _major_version; // major version number of class file
232 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
233 int _vtable_len; // length of Java vtable (in words)
234 int _itable_len; // length of Java itable (in words)
235 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
236 JNIid* _jni_ids; // First JNI identifier for static fields in this class
237 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
238 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
239 nmethodBucket* _dependencies; // list of dependent nmethods
240 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
241 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
242 // Array of interesting part(s) of the previous version(s) of this
243 // InstanceKlass. See PreviousVersionWalker below.
244 GrowableArray<PreviousVersionNode *>* _previous_versions;
245 // JVMTI fields can be moved to their own structure - see 6315920
246 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
247 jint _cached_class_file_len; // JVMTI: length of above
248 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
249
250 // true if class, superclass, or implemented interfaces have default methods
251 bool _has_default_methods;
252
253 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
254 // Method array.
255 Array<Method*>* _methods;
256 // Interface (Klass*s) this class declares locally to implement.
257 Array<Klass*>* _local_interfaces;
258 // Interface (Klass*s) this class implements transitively.
259 Array<Klass*>* _transitive_interfaces;
260 // Int array containing the original order of method in the class file (for JVMTI).
261 Array<int>* _method_ordering;
262 // Instance and static variable information, starts with 6-tuples of shorts
263 // [access, name index, sig index, initval index, low_offset, high_offset]
264 // for all fields, followed by the generic signature data at the end of
265 // the array. Only fields with generic signature attributes have the generic
266 // signature data set in the array. The fields array looks like following:
267 //
268 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
269 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
270 // ...
271 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
272 // [generic signature index]
273 // [generic signature index]
274 // ...
275 Array<u2>* _fields;
276
277 // Class states are defined as ClassState (see above).
278 // Place the _init_state here to utilize the unused 2-byte after
279 // _idnum_allocated_count.
280 u1 _init_state; // state of class
281
282 u1 _reference_type; // reference type
283
284 // embedded Java vtable follows here
285 // embedded Java itables follows here
286 // embedded static fields follows here
287 // embedded nonstatic oop-map blocks follows here
288 // embedded implementor of this interface follows here
289 // The embedded implementor only exists if the current klass is an
290 // iterface. The possible values of the implementor fall into following
291 // three cases:
292 // NULL: no implementor.
293 // A Klass* that's not itself: one implementor.
294 // Itsef: more than one implementors.
295 // embedded host klass follows here
296 // The embedded host klass only exists in an anonymous class for
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203 Symbol* _source_file_name;
204 // the source debug extension for this klass, NULL if not specified.
205 // Specified as UTF-8 string without terminating zero byte in the classfile,
206 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
207 char* _source_debug_extension;
208 // Generic signature, or null if none.
209 Symbol* _generic_signature;
210 // Array name derived from this class which needs unreferencing
211 // if this class is unloaded.
212 Symbol* _array_name;
213
214 // Number of heapOopSize words used by non-static fields in this klass
215 // (including inherited fields but after header_size()).
216 int _nonstatic_field_size;
217 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
218 u2 _static_oop_field_count;// number of static oop fields in this klass
219 u2 _java_fields_count; // The number of declared Java fields
220 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
221
222 bool _is_marked_dependent; // used for marking during flushing and deoptimization
223 // true if class, superclass, or implemented interfaces have default methods
224 bool _has_default_methods;
225
226 enum {
227 _misc_rewritten = 1 << 0, // methods rewritten.
228 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
229 _misc_should_verify_class = 1 << 2, // allow caching of preverification
230 _misc_is_anonymous = 1 << 3 // has embedded _inner_classes field
231 };
232 u2 _misc_flags;
233 u2 _minor_version; // minor version number of class file
234 u2 _major_version; // major version number of class file
235 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
236 int _vtable_len; // length of Java vtable (in words)
237 int _itable_len; // length of Java itable (in words)
238 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
239 JNIid* _jni_ids; // First JNI identifier for static fields in this class
240 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
241 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
242 nmethodBucket* _dependencies; // list of dependent nmethods
243 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
244 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
245 // Array of interesting part(s) of the previous version(s) of this
246 // InstanceKlass. See PreviousVersionWalker below.
247 GrowableArray<PreviousVersionNode *>* _previous_versions;
248 // JVMTI fields can be moved to their own structure - see 6315920
249 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
250 jint _cached_class_file_len; // JVMTI: length of above
251 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
252
253 // Method array.
254 Array<Method*>* _methods;
255 // Interface (Klass*s) this class declares locally to implement.
256 Array<Klass*>* _local_interfaces;
257 // Interface (Klass*s) this class implements transitively.
258 Array<Klass*>* _transitive_interfaces;
259 // Int array containing the original order of method in the class file (for JVMTI).
260 Array<int>* _method_ordering;
261 // Instance and static variable information, starts with 6-tuples of shorts
262 // [access, name index, sig index, initval index, low_offset, high_offset]
263 // for all fields, followed by the generic signature data at the end of
264 // the array. Only fields with generic signature attributes have the generic
265 // signature data set in the array. The fields array looks like following:
266 //
267 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
268 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
269 // ...
270 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
271 // [generic signature index]
272 // [generic signature index]
273 // ...
274 Array<u2>* _fields;
275
276 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
277
278 // Class states are defined as ClassState (see above).
279 // Place the _init_state here to utilize the unused 2-byte after
280 // _idnum_allocated_count.
281 u1 _init_state; // state of class
282
283 u1 _reference_type; // reference type
284
285 // embedded Java vtable follows here
286 // embedded Java itables follows here
287 // embedded static fields follows here
288 // embedded nonstatic oop-map blocks follows here
289 // embedded implementor of this interface follows here
290 // The embedded implementor only exists if the current klass is an
291 // iterface. The possible values of the implementor fall into following
292 // three cases:
293 // NULL: no implementor.
294 // A Klass* that's not itself: one implementor.
295 // Itsef: more than one implementors.
296 // embedded host klass follows here
297 // The embedded host klass only exists in an anonymous class for
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