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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System;
using System.Linq.Expressions;
namespace Microsoft.Scripting.Ast {
/// <summary>
/// We don't need to insert code to track lines in adaptive mode as the
/// interpreter does that for us. TODO: improve the adaptive compiler so we
/// don't need to do this, and can just remove line tracking from languages
/// </summary>
public sealed class SkipInterpretExpression : Expression {
private readonly Expression _body;
internal SkipInterpretExpression(Expression body) {
if (body.Type != typeof(void)) {
body = Expression.Block(body, Utils.Empty());
}
_body = body;
}
public Expression Body {
get { return _body; }
}
public sealed override Type Type {
get { return typeof(void); }
}
public sealed override ExpressionType NodeType {
get { return ExpressionType.Extension; }
}
public override bool CanReduce {
get { return true; }
}
public override Expression Reduce() {
return _body;
}
protected override Expression VisitChildren(ExpressionVisitor visitor) {
Expression body = visitor.Visit(_body);
if (body == _body) {
return this;
}
return new SkipInterpretExpression(body);
}
}
public static partial class Utils {
public static SkipInterpretExpression SkipInterpret(Expression body) {
var skip = body as SkipInterpretExpression;
if (skip != null) {
return skip;
}
return new SkipInterpretExpression(body);
}
}
}
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