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//
// LambdaExpression.cs
//
// Author:
// Jb Evain (jbevain@novell.com)
// Miguel de Icaza (miguel@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.Collections.ObjectModel;
using System.Collections.Generic;
using System.Reflection;
using System.Reflection.Emit;
namespace System.Linq.Expressions {
public class LambdaExpression : Expression {
Expression body;
ReadOnlyCollection<ParameterExpression> parameters;
public Expression Body {
get { return body; }
}
public ReadOnlyCollection<ParameterExpression> Parameters {
get { return parameters; }
}
internal LambdaExpression (Type delegateType, Expression body, ReadOnlyCollection<ParameterExpression> parameters)
: base (ExpressionType.Lambda, delegateType)
{
this.body = body;
this.parameters = parameters;
}
void EmitPopIfNeeded (EmitContext ec)
{
if (GetReturnType () == typeof (void) && body.Type != typeof (void))
ec.ig.Emit (OpCodes.Pop);
}
internal override void Emit (EmitContext ec)
{
ec.EmitCreateDelegate (this);
}
internal void EmitBody (EmitContext ec)
{
body.Emit (ec);
EmitPopIfNeeded (ec);
ec.ig.Emit (OpCodes.Ret);
}
internal Type GetReturnType ()
{
return this.Type.GetInvokeMethod ().ReturnType;
}
public Delegate Compile ()
{
#if TARGET_JVM || MONOTOUCH
System.Linq.jvm.Interpreter inter =
new System.Linq.jvm.Interpreter (this);
inter.Validate ();
return inter.CreateDelegate ();
#else
var context = new CompilationContext ();
context.AddCompilationUnit (this);
return context.CreateDelegate ();
#endif
}
}
}
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