// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
 
namespace Microsoft.CSharp.RuntimeBinder.Semantics
{
    internal abstract class Expr
    {
        private CType _type;
 
        protected Expr(ExpressionKind kind)
        {
            Kind = kind;
        }
 
        internal object RuntimeObject { get; set; }
 
        internal CType RuntimeObjectActualType { get; set; }
 
        public ExpressionKind Kind { get; }
 
        public EXPRFLAG Flags { get; set; }
 
        public bool IsOptionalArgument { get; set; }
 
        public string ErrorString { get; set; }
 
        public CType Type
        {
            get
            {
                Debug.Assert(!(this is ExprList));
                Debug.Assert(_type != null);
                return _type;
            }
            protected set { _type = value; }
        }
 
        [ExcludeFromCodeCoverage(Justification = "Should only be called through override")]
        public virtual object Object
        {
            [RequiresUnreferencedCode(Binder.TrimmerWarning)]
            get
            {
                Debug.Fail("Invalid Expr in GetObject");
                throw Error.InternalCompilerError();
            }
        }
    }
}