public override void EnterStop_stat(langParser.Stop_statContext context)
        {
            RuleContext rule = context.Parent;

            while (rule != context.my_while)
            {
                if (rule.GetType().Name == "IifContext" || rule.GetType().Name == "Else_ifContext")
                {
                    this.current_space.add_instruction(new PopStack(this.current_space));
                }
                rule = rule.Parent;
                //remove all of the if conditional values from expression stack
            }

            this.current_space.add_instruction(new PopStack(this.current_space));            // remomve the value of the if conditional expression from expression_stack
        }
 public override void ExitStop_stat(langParser.Stop_statContext context)
 {
     this.current_space.add_instruction(null);
     context.my_while.breaks.Add(this.current_space.number_of_instruction() - 1);
 }