void Initialize ()
{
TypeInfo[] sub_fields = TypeInfo.SubStructInfo;
if (sub_fields != null) {
sub_info = new VariableInfo [sub_fields.Length];
for (int i = 0; i < sub_fields.Length; i++) {
if (sub_fields [i] != null)
sub_info [i] = new VariableInfo (this, sub_fields [i]);
}
} else
sub_info = new VariableInfo [0];
}