//
// TypeBinaryExpression.cs
//
// Author:
//   Jb Evain (jbevain@novell.com)
//
// (C) 2008 Novell, Inc. (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Reflection.Emit;

namespace System.Linq.Expressions {

	public sealed class TypeBinaryExpression : Expression {

		Expression expression;
		Type type_operand;

		public Expression Expression {
			get { return expression; }
		}

		public Type TypeOperand {
			get { return type_operand; }
		}

		internal TypeBinaryExpression (ExpressionType node_type, Expression expression, Type type_operand, Type type)
			: base (node_type, type)
		{
			this.expression = expression;
			this.type_operand = type_operand;
		}

		internal override void Emit (EmitContext ec)
		{
			if (expression.Type == typeof (void)) {
				ec.ig.Emit (OpCodes.Ldc_I4_0);
				return;
			}

			ec.EmitIsInst (expression, type_operand);

			ec.ig.Emit (OpCodes.Ldnull);
			ec.ig.Emit (OpCodes.Cgt_Un);
		}
	}
}