jint Klass::array_layout_helper(BasicType etype) { assert(etype >= T_BOOLEAN && etype <= T_OBJECT, "valid etype"); // Note that T_ARRAY is not allowed here. int hsize = arrayOopDesc::base_offset_in_bytes(etype); int esize = type2aelembytes(etype); bool isobj = (etype == T_OBJECT); int tag = isobj ? _lh_array_tag_obj_value : _lh_array_tag_type_value; int lh = array_layout_helper(tag, hsize, etype, exact_log2(esize)); assert(lh < (int)_lh_neutral_value, "must look like an array layout"); assert(layout_helper_is_javaArray(lh), "correct kind"); assert(layout_helper_is_objArray(lh) == isobj, "correct kind"); assert(layout_helper_is_typeArray(lh) == !isobj, "correct kind"); assert(layout_helper_header_size(lh) == hsize, "correct decode"); assert(layout_helper_element_type(lh) == etype, "correct decode"); assert(1 << layout_helper_log2_element_size(lh) == esize, "correct decode"); return lh; }
// offset of first element, including any padding for the sake of alignment int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); }