/IronPython_Main/Languages/Ruby/Ruby/Compiler/Ast/Statements/ShutdownHandlerStatement.cs

/* ****************************************************************************

 *

 * Copyright (c) Microsoft Corporation. 

 *

 * This source code is subject to terms and conditions of the Apache License, Version 2.0. A 

 * copy of the license can be found in the License.html file at the root of this distribution. If 

 * you cannot locate the  Apache License, Version 2.0, please send an email to 

 * ironruby@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 

 * by the terms of the Apache License, Version 2.0.

 *

 * You must not remove this notice, or any other, from this software.

 *

 *

 * ***************************************************************************/



#if !CLR2

using MSA = System.Linq.Expressions;

#else

using MSA = Microsoft.Scripting.Ast;

#endif



using Microsoft.Scripting;



namespace IronRuby.Compiler.Ast {

    using Ast = MSA.Expression;

    using AstUtils = Microsoft.Scripting.Ast.Utils;



    /// <summary>

    /// Implements END block. This block behaves like Kernel#at_exit with a true block definition. 

    /// </summary>

    public partial class ShutdownHandlerStatement : Expression {

        private readonly BlockDefinition/*!*/ _block;



        public BlockDefinition/*!*/ Block {

            get { return _block; }

        }



        public ShutdownHandlerStatement(LexicalScope/*!*/ definedScope, Statements/*!*/ body, SourceSpan location)

            : base(location) {

            _block = new BlockDefinition(definedScope, null, body, location);

        }



        internal override MSA.Expression/*!*/ Transform(AstGenerator/*!*/ gen) {

            return Methods.RegisterShutdownHandler.OpCall(_block.Transform(gen));

        }



        internal override MSA.Expression/*!*/ TransformRead(AstGenerator/*!*/ gen) {

            return Ast.Block(Transform(gen), AstUtils.Constant(null));

        }

    }



}