AST.Variable.GetExpr C# (CSharp) 메소드

        public override ABT.Expr GetExpr(ABT.Env env) {
            Option<ABT.Env.Entry> entry_opt = env.Find(this.Name);

            if (entry_opt.IsNone) {
                throw new InvalidOperationException($"Cannot find variable '{this.Name}'");
            }

            ABT.Env.Entry entry = entry_opt.Value;

            switch (entry.Kind) {
                case ABT.Env.EntryKind.TYPEDEF:
                    throw new InvalidOperationException($"Expected a variable '{this.Name}', not a typedef.");
                case ABT.Env.EntryKind.ENUM:
                    return new ABT.ConstLong(entry.Offset, env);
                case ABT.Env.EntryKind.FRAME:
                case ABT.Env.EntryKind.GLOBAL:
                case ABT.Env.EntryKind.STACK:
                    return new ABT.Variable(entry.Type, this.Name, env);
                default:
                    throw new InvalidOperationException($"Cannot find variable '{this.Name}'");
            }
        }
    }