5 // Jb Evain (jbevain@novell.com)
6 // Miguel de Icaza (miguel@novell.com)
8 // (C) 2008 Novell, Inc. (http://www.novell.com)
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 using System.Collections.ObjectModel;
32 using System.Collections.Generic;
33 using System.Reflection;
34 using System.Reflection.Emit;
36 namespace System.Linq.Expressions {
38 public class LambdaExpression : Expression {
41 ReadOnlyCollection<ParameterExpression> parameters;
43 public Expression Body {
47 public ReadOnlyCollection<ParameterExpression> Parameters {
48 get { return parameters; }
51 static bool CanAssign (Type target, Type source)
53 // This catches object and value type mixage, type compatibility is handled later
54 if (target.IsValueType ^ source.IsValueType)
57 return source.IsAssignableTo (target);
60 internal LambdaExpression (Type delegateType, Expression body, ReadOnlyCollection<ParameterExpression> parameters)
61 : base (ExpressionType.Lambda, delegateType)
63 if (!delegateType.IsSubclassOf (typeof (System.Delegate)))
64 throw new ArgumentException ("delegateType");
66 var invoke = delegateType.GetMethod ("Invoke", BindingFlags.Instance | BindingFlags.Public);
68 throw new ArgumentException ("delegate must contain an Invoke method", "delegateType");
70 var invoke_parameters = invoke.GetParameters ();
71 if (invoke_parameters.Length != parameters.Count)
72 throw new ArgumentException (string.Format ("Different number of arguments in delegate {0}", delegateType), "delegateType");
74 for (int i = 0; i < invoke_parameters.Length; i++){
75 if (!CanAssign (parameters [i].Type, invoke_parameters [i].ParameterType))
76 throw new ArgumentException (String.Format ("Can not assign a {0} to a {1}", invoke_parameters [i].ParameterType, parameters [i].Type));
79 if (invoke.ReturnType != typeof (void) && !CanAssign (invoke.ReturnType, body.Type))
80 throw new ArgumentException (String.Format ("body type {0} can not be assigned to {1}", body.Type, invoke.ReturnType));
83 this.parameters = parameters;
86 void EmitPopIfNeeded (EmitContext ec)
88 if (GetReturnType () == typeof (void) && body.Type != typeof (void))
89 ec.ig.Emit (OpCodes.Pop);
92 internal override void Emit (EmitContext ec)
96 ec.ig.Emit (OpCodes.Ret);
99 internal Type GetReturnType ()
101 return this.Type.GetMethod ("Invoke").ReturnType;
104 public Delegate Compile ()
107 System.Linq.jvm.Interpreter inter =
108 new System.Linq.jvm.Interpreter (this);
110 return inter.CreateDelegate ();
112 var context = EmitContext.Create (this);
113 return context.CreateDelegate ();