# Compile the runtime value structure
	#
	# RTVal both represents object instances and primitives values:
	# * object instances:
	#   * `rtclass` the class of the RTVal is instance of
	#   * `attrs` contains the attributes of the instance
	# * primitive values:
	#   * `rtclass` represents the class of the primitive value Nit type
	#   * `value` contains the primitive value of the instance
	# * null values:
	#   * they must have both `rtclass` and `value` as null
	fun compile_rtval(compiler: JavaCompiler) do
		var v = compiler.new_visitor("RTVal.java")
		v.add("import java.util.HashMap;")
		v.add("public class RTVal \{")
		v.add("  public RTClass rtclass;")
		v.add("  public HashMap<String, RTVal> attrs = new HashMap<>();")
		v.add("  Object value;")
		v.add("  public RTVal(RTClass rtclass) \{")
		v.add("    this.rtclass = rtclass;")
		v.add("  \}")
		v.add("  public RTVal(RTClass rtclass, Object value) \{")
		v.add("    this.rtclass = rtclass;")
		v.add("    this.value = value;")
		v.add("  \}")
		v.add("  public boolean is_null() \{ return rtclass == null && value == null; \}")
		v.add("\}")
	end