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comparison src/share/vm/oops/instanceKlass.hpp @ 4737:75c0a73eee98

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7102776: Pack instanceKlass boolean fields into single u1 field Summary: Reduce class runtime memory usage by packing 4 instanceKlass boolean fields into single u1 field. Save 4-byte for each loaded class. Reviewed-by: dholmes, bobv, phh, twisti, never, coleenp Contributed-by: Jiangli Zhou <jiangli.zhou@oracle.com>
author coleenp
date Thu, 17 Nov 2011 12:53:59 -0500
parents f6f3bb0ee072
children 52b5d32fbfaf
comparison
equal deleted inserted replaced
4038:869804b759e7 4737:75c0a73eee98
228 int _nonstatic_field_size; 228 int _nonstatic_field_size;
229 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 229 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
230 int _static_oop_field_count;// number of static oop fields in this klass 230 int _static_oop_field_count;// number of static oop fields in this klass
231 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 231 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
232 int _java_fields_count; // The number of declared Java fields 232 int _java_fields_count; // The number of declared Java fields
233 bool _is_marked_dependent; // used for marking during flushing and deoptimization 233
234 bool _rewritten; // methods rewritten.
235 bool _has_nonstatic_fields; // for sizing with UseCompressedOops
236 bool _should_verify_class; // allow caching of preverification
237 u2 _minor_version; // minor version number of class file 234 u2 _minor_version; // minor version number of class file
238 u2 _major_version; // major version number of class file 235 u2 _major_version; // major version number of class file
239 ClassState _init_state; // state of class 236 ClassState _init_state; // state of class
240 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 237 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
241 int _vtable_len; // length of Java vtable (in words) 238 int _vtable_len; // length of Java vtable (in words)
258 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH 255 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
259 jint _cached_class_file_len; // JVMTI: length of above 256 jint _cached_class_file_len; // JVMTI: length of above
260 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 257 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
261 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 258 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
262 259
260 // Compact the following four boolean flags into 1-bit each. These four flags
261 // were defined as separate boolean fields and each was 1-byte before. Since
262 // there are 2 bytes unused after the _idnum_allocated_count field, place the
263 // _misc_flags field after _idnum_allocated_count to utilize the unused bits
264 // and save total 4-bytes.
265 enum {
266 IS_MARKED_DEPENDENT = 0x1, // used for marking during flushing and deoptimization
267 REWRITTEN = 0x2, // methods rewritten.
268 HAS_NONSTATIC_FIELDS = 0x4, // for sizing with UseCompressedOops
269 SHOULD_VERIFY_CLASS = 0x8 // allow caching of preverification
270 };
271 u1 _misc_flags;
272
263 // embedded Java vtable follows here 273 // embedded Java vtable follows here
264 // embedded Java itables follows here 274 // embedded Java itables follows here
265 // embedded static fields follows here 275 // embedded static fields follows here
266 // embedded nonstatic oop-map blocks follows here 276 // embedded nonstatic oop-map blocks follows here
267 277
268 friend class instanceKlassKlass; 278 friend class instanceKlassKlass;
269 friend class SystemDictionary; 279 friend class SystemDictionary;
270 280
271 public: 281 public:
272 bool has_nonstatic_fields() const { return _has_nonstatic_fields; } 282 bool has_nonstatic_fields() const { return (_misc_flags & HAS_NONSTATIC_FIELDS) != 0; }
273 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; } 283 void set_has_nonstatic_fields(bool b) {
284 if (b) {
285 _misc_flags |= HAS_NONSTATIC_FIELDS;
286 } else {
287 _misc_flags &= ~HAS_NONSTATIC_FIELDS;
288 }
289 }
274 290
275 // field sizes 291 // field sizes
276 int nonstatic_field_size() const { return _nonstatic_field_size; } 292 int nonstatic_field_size() const { return _nonstatic_field_size; }
277 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 293 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
278 294
376 bool is_not_initialized() const { return _init_state < being_initialized; } 392 bool is_not_initialized() const { return _init_state < being_initialized; }
377 bool is_being_initialized() const { return _init_state == being_initialized; } 393 bool is_being_initialized() const { return _init_state == being_initialized; }
378 bool is_in_error_state() const { return _init_state == initialization_error; } 394 bool is_in_error_state() const { return _init_state == initialization_error; }
379 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 395 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
380 int get_init_state() { return _init_state; } // Useful for debugging 396 int get_init_state() { return _init_state; } // Useful for debugging
381 bool is_rewritten() const { return _rewritten; } 397 bool is_rewritten() const { return (_misc_flags & REWRITTEN) != 0; }
382 398
383 // defineClass specified verification 399 // defineClass specified verification
384 bool should_verify_class() const { return _should_verify_class; } 400 bool should_verify_class() const { return (_misc_flags & SHOULD_VERIFY_CLASS) != 0; }
385 void set_should_verify_class(bool value) { _should_verify_class = value; } 401 void set_should_verify_class(bool value) {
402 if (value) {
403 _misc_flags |= SHOULD_VERIFY_CLASS;
404 } else {
405 _misc_flags &= ~SHOULD_VERIFY_CLASS;
406 }
407 }
408
386 409
387 // marking 410 // marking
388 bool is_marked_dependent() const { return _is_marked_dependent; } 411 bool is_marked_dependent() const { return (_misc_flags & IS_MARKED_DEPENDENT) != 0; }
389 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 412 void set_is_marked_dependent() { _misc_flags |= IS_MARKED_DEPENDENT; }
413 void clear_is_marked_dependent() { _misc_flags &= ~IS_MARKED_DEPENDENT; }
390 414
391 // initialization (virtuals from Klass) 415 // initialization (virtuals from Klass)
392 bool should_be_initialized() const; // means that initialize should be called 416 bool should_be_initialized() const; // means that initialize should be called
393 void initialize(TRAPS); 417 void initialize(TRAPS);
394 void link_class(TRAPS); 418 void link_class(TRAPS);
754 #ifdef ASSERT 778 #ifdef ASSERT
755 void set_init_state(ClassState state); 779 void set_init_state(ClassState state);
756 #else 780 #else
757 void set_init_state(ClassState state) { _init_state = state; } 781 void set_init_state(ClassState state) { _init_state = state; }
758 #endif 782 #endif
759 void set_rewritten() { _rewritten = true; } 783 void set_rewritten() { _misc_flags |= REWRITTEN; }
760 void set_init_thread(Thread *thread) { _init_thread = thread; } 784 void set_init_thread(Thread *thread) { _init_thread = thread; }
761 785
762 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 786 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
763 // The RedefineClasses() API can cause new method idnums to be needed 787 // The RedefineClasses() API can cause new method idnums to be needed
764 // which will cause the caches to grow. Safety requires different 788 // which will cause the caches to grow. Safety requires different