292   static ByteSize primary_supers_offset()        { return in_ByteSize(offset_of(Klass, _primary_supers)); }
 293   static ByteSize secondary_super_cache_offset() { return in_ByteSize(offset_of(Klass, _secondary_super_cache)); }
 294   static ByteSize secondary_supers_offset()      { return in_ByteSize(offset_of(Klass, _secondary_supers)); }
 295   static ByteSize java_mirror_offset()           { return in_ByteSize(offset_of(Klass, _java_mirror)); }
 296   static ByteSize modifier_flags_offset()        { return in_ByteSize(offset_of(Klass, _modifier_flags)); }
 297   static ByteSize layout_helper_offset()         { return in_ByteSize(offset_of(Klass, _layout_helper)); }
 298   static ByteSize access_flags_offset()          { return in_ByteSize(offset_of(Klass, _access_flags)); }
 299 
 300   // Unpacking layout_helper:
 301   enum {
 302     _lh_neutral_value           = 0,  // neutral non-array non-instance value
 303     _lh_instance_slow_path_bit  = 0x01,
 304     _lh_log2_element_size_shift = BitsPerByte*0,
 305     _lh_log2_element_size_mask  = BitsPerLong-1,
 306     _lh_element_type_shift      = BitsPerByte*1,
 307     _lh_element_type_mask       = right_n_bits(BitsPerByte),  // shifted mask
 308     _lh_header_size_shift       = BitsPerByte*2,
 309     _lh_header_size_mask        = right_n_bits(BitsPerByte),  // shifted mask
 310     _lh_array_tag_bits          = 2,
 311     _lh_array_tag_shift         = BitsPerInt - _lh_array_tag_bits,
 312     _lh_array_tag_type_value    = ~0x00,  // 0xC0000000 >> 30
 313     _lh_array_tag_obj_value     = ~0x01   // 0x80000000 >> 30
 314   };
 315 


 316   static int layout_helper_size_in_bytes(jint lh) {
 317     assert(lh > (jint)_lh_neutral_value, "must be instance");
 318     return (int) lh & ~_lh_instance_slow_path_bit;
 319   }
 320   static bool layout_helper_needs_slow_path(jint lh) {
 321     assert(lh > (jint)_lh_neutral_value, "must be instance");
 322     return (lh & _lh_instance_slow_path_bit) != 0;
 323   }
 324   static bool layout_helper_is_instance(jint lh) {
 325     return (jint)lh > (jint)_lh_neutral_value;
 326   }
 327   static bool layout_helper_is_array(jint lh) {
 328     return (jint)lh < (jint)_lh_neutral_value;
 329   }
 330   static bool layout_helper_is_typeArray(jint lh) {
 331     // _lh_array_tag_type_value == (lh >> _lh_array_tag_shift);
 332     return (juint)lh >= (juint)(_lh_array_tag_type_value << _lh_array_tag_shift);
 333   }
 334   static bool layout_helper_is_objArray(jint lh) {
 335     // _lh_array_tag_obj_value == (lh >> _lh_array_tag_shift);

 292   static ByteSize primary_supers_offset()        { return in_ByteSize(offset_of(Klass, _primary_supers)); }
 293   static ByteSize secondary_super_cache_offset() { return in_ByteSize(offset_of(Klass, _secondary_super_cache)); }
 294   static ByteSize secondary_supers_offset()      { return in_ByteSize(offset_of(Klass, _secondary_supers)); }
 295   static ByteSize java_mirror_offset()           { return in_ByteSize(offset_of(Klass, _java_mirror)); }
 296   static ByteSize modifier_flags_offset()        { return in_ByteSize(offset_of(Klass, _modifier_flags)); }
 297   static ByteSize layout_helper_offset()         { return in_ByteSize(offset_of(Klass, _layout_helper)); }
 298   static ByteSize access_flags_offset()          { return in_ByteSize(offset_of(Klass, _access_flags)); }
 299 
 300   // Unpacking layout_helper:
 301   enum {
 302     _lh_neutral_value           = 0,  // neutral non-array non-instance value
 303     _lh_instance_slow_path_bit  = 0x01,
 304     _lh_log2_element_size_shift = BitsPerByte*0,
 305     _lh_log2_element_size_mask  = BitsPerLong-1,
 306     _lh_element_type_shift      = BitsPerByte*1,
 307     _lh_element_type_mask       = right_n_bits(BitsPerByte),  // shifted mask
 308     _lh_header_size_shift       = BitsPerByte*2,
 309     _lh_header_size_mask        = right_n_bits(BitsPerByte),  // shifted mask
 310     _lh_array_tag_bits          = 2,
 311     _lh_array_tag_shift         = BitsPerInt - _lh_array_tag_bits,

 312     _lh_array_tag_obj_value     = ~0x01   // 0x80000000 >> 30
 313   };
 314 
 315   static const unsigned int _lh_array_tag_type_value = 0Xffffffff; // ~0x00,  // 0xC0000000 >> 30
 316 
 317   static int layout_helper_size_in_bytes(jint lh) {
 318     assert(lh > (jint)_lh_neutral_value, "must be instance");
 319     return (int) lh & ~_lh_instance_slow_path_bit;
 320   }
 321   static bool layout_helper_needs_slow_path(jint lh) {
 322     assert(lh > (jint)_lh_neutral_value, "must be instance");
 323     return (lh & _lh_instance_slow_path_bit) != 0;
 324   }
 325   static bool layout_helper_is_instance(jint lh) {
 326     return (jint)lh > (jint)_lh_neutral_value;
 327   }
 328   static bool layout_helper_is_array(jint lh) {
 329     return (jint)lh < (jint)_lh_neutral_value;
 330   }
 331   static bool layout_helper_is_typeArray(jint lh) {
 332     // _lh_array_tag_type_value == (lh >> _lh_array_tag_shift);
 333     return (juint)lh >= (juint)(_lh_array_tag_type_value << _lh_array_tag_shift);
 334   }
 335   static bool layout_helper_is_objArray(jint lh) {
 336     // _lh_array_tag_obj_value == (lh >> _lh_array_tag_shift);