324   static bool layout_helper_is_objArray(jint lh) {
 325     // _lh_array_tag_obj_value == (lh >> _lh_array_tag_shift);
 326     return (jint)lh < (jint)(_lh_array_tag_type_value << _lh_array_tag_shift);
 327   }
 328   static int layout_helper_header_size(jint lh) {
 329     assert(lh < (jint)_lh_neutral_value, "must be array");
 330     int hsize = (lh >> _lh_header_size_shift) & _lh_header_size_mask;
 331     assert(hsize > 0 && hsize < (int)sizeof(oopDesc)*3, "sanity");
 332     return hsize;
 333   }
 334   static BasicType layout_helper_element_type(jint lh) {
 335     assert(lh < (jint)_lh_neutral_value, "must be array");
 336     int btvalue = (lh >> _lh_element_type_shift) & _lh_element_type_mask;
 337     assert(btvalue >= T_BOOLEAN && btvalue <= T_OBJECT, "sanity");
 338     return (BasicType) btvalue;
 339   }
 340   static int layout_helper_log2_element_size(jint lh) {
 341     assert(lh < (jint)_lh_neutral_value, "must be array");
 342     int l2esz = (lh >> _lh_log2_element_size_shift) & _lh_log2_element_size_mask;
 343     assert(l2esz <= LogBitsPerLong,
 344         err_msg("sanity. l2esz: 0x%x for lh: 0x%x", (uint)l2esz, (uint)lh));
 345     return l2esz;
 346   }
 347   static jint array_layout_helper(jint tag, int hsize, BasicType etype, int log2_esize) {
 348     return (tag        << _lh_array_tag_shift)
 349       |    (hsize      << _lh_header_size_shift)
 350       |    ((int)etype << _lh_element_type_shift)
 351       |    (log2_esize << _lh_log2_element_size_shift);
 352   }
 353   static jint instance_layout_helper(jint size, bool slow_path_flag) {
 354     return (size << LogHeapWordSize)
 355       |    (slow_path_flag ? _lh_instance_slow_path_bit : 0);
 356   }
 357   static int layout_helper_to_size_helper(jint lh) {
 358     assert(lh > (jint)_lh_neutral_value, "must be instance");
 359     // Note that the following expression discards _lh_instance_slow_path_bit.
 360     return lh >> LogHeapWordSize;
 361   }
 362   // Out-of-line version computes everything based on the etype:
 363   static jint array_layout_helper(BasicType etype);
 364 

 324   static bool layout_helper_is_objArray(jint lh) {
 325     // _lh_array_tag_obj_value == (lh >> _lh_array_tag_shift);
 326     return (jint)lh < (jint)(_lh_array_tag_type_value << _lh_array_tag_shift);
 327   }
 328   static int layout_helper_header_size(jint lh) {
 329     assert(lh < (jint)_lh_neutral_value, "must be array");
 330     int hsize = (lh >> _lh_header_size_shift) & _lh_header_size_mask;
 331     assert(hsize > 0 && hsize < (int)sizeof(oopDesc)*3, "sanity");
 332     return hsize;
 333   }
 334   static BasicType layout_helper_element_type(jint lh) {
 335     assert(lh < (jint)_lh_neutral_value, "must be array");
 336     int btvalue = (lh >> _lh_element_type_shift) & _lh_element_type_mask;
 337     assert(btvalue >= T_BOOLEAN && btvalue <= T_OBJECT, "sanity");
 338     return (BasicType) btvalue;
 339   }
 340   static int layout_helper_log2_element_size(jint lh) {
 341     assert(lh < (jint)_lh_neutral_value, "must be array");
 342     int l2esz = (lh >> _lh_log2_element_size_shift) & _lh_log2_element_size_mask;
 343     assert(l2esz <= LogBitsPerLong,
 344            "sanity. l2esz: 0x%x for lh: 0x%x", (uint)l2esz, (uint)lh);
 345     return l2esz;
 346   }
 347   static jint array_layout_helper(jint tag, int hsize, BasicType etype, int log2_esize) {
 348     return (tag        << _lh_array_tag_shift)
 349       |    (hsize      << _lh_header_size_shift)
 350       |    ((int)etype << _lh_element_type_shift)
 351       |    (log2_esize << _lh_log2_element_size_shift);
 352   }
 353   static jint instance_layout_helper(jint size, bool slow_path_flag) {
 354     return (size << LogHeapWordSize)
 355       |    (slow_path_flag ? _lh_instance_slow_path_bit : 0);
 356   }
 357   static int layout_helper_to_size_helper(jint lh) {
 358     assert(lh > (jint)_lh_neutral_value, "must be instance");
 359     // Note that the following expression discards _lh_instance_slow_path_bit.
 360     return lh >> LogHeapWordSize;
 361   }
 362   // Out-of-line version computes everything based on the etype:
 363   static jint array_layout_helper(BasicType etype);
 364