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;
35 using System.Threading;
37 namespace System.Linq.Expressions {
39 internal class EmitContext {
40 internal LambdaExpression Owner;
41 internal Type [] ParamTypes;
42 internal DynamicMethod Method;
43 internal ILGenerator ig;
45 static object mlock = new object ();
46 internal static int method_count;
47 static string GenName ()
50 return "<LINQ-" + method_count++ + ">";
54 public EmitContext (LambdaExpression owner)
58 ParamTypes = new Type [Owner.parameters.Count];
59 for (int i = 0; i < Owner.parameters.Count; i++)
60 ParamTypes [i] = Owner.parameters [i].Type;
63 // We probably want to use the 3.5 new API calls to associate
64 // the method with the "sandboxed" Assembly, instead am currently
65 // dumping these types in this class
67 Type owner_of_code = typeof (EmitContext);
71 // FIXME: Need to force this to be verifiable, see:
72 // https://bugzilla.novell.com/show_bug.cgi?id=355005
74 string name = GenName ();
75 Method = new DynamicMethod (name, Owner.Type, ParamTypes, owner_of_code);
77 ig = Method.GetILGenerator ();
80 internal Delegate CreateDelegate ()
82 return Method.CreateDelegate (Owner.delegate_type);
85 internal int GetParameterPosition (ParameterExpression p)
87 int position = Owner.Parameters.IndexOf (p);
89 throw new InvalidOperationException ("Parameter not in scope");
95 public class LambdaExpression : Expression {
98 // LambdaExpression parameters
101 internal ReadOnlyCollection<ParameterExpression> parameters;
102 internal Type delegate_type;
104 // This is set during compilation
105 Delegate lambda_delegate;
107 static bool CanAssign (Type target, Type source)
109 // This catches object and value type mixage, type compatibility is handled later
110 if (target.IsValueType ^ source.IsValueType)
113 return target.IsAssignableFrom (source);
116 internal LambdaExpression (Type delegateType, Expression body, ReadOnlyCollection<ParameterExpression> parameters)
117 : base (ExpressionType.Lambda, body.Type)
119 if (!delegateType.IsSubclassOf (typeof (System.Delegate)))
120 throw new ArgumentException ("delegateType");
122 var invoke = delegateType.GetMethod ("Invoke", BindingFlags.Instance | BindingFlags.Public);
124 throw new ArgumentException ("delegate must contain an Invoke method", "delegateType");
126 var invoke_parameters = invoke.GetParameters ();
127 if (invoke_parameters.Length != parameters.Count)
128 throw new ArgumentException ("Different number of arguments in delegate {0}", "delegateType");
130 for (int i = 0; i < invoke_parameters.Length; i++){
131 if (!CanAssign (parameters [i].Type, invoke_parameters [i].ParameterType))
132 throw new ArgumentException (String.Format ("Can not assign a {0} to a {1}", invoke_parameters [i].ParameterType, parameters [i].Type));
135 if (!CanAssign (invoke.ReturnType, body.Type))
136 throw new ArgumentException (String.Format ("body type {0} can not be assigned to {1}", body.Type, invoke.ReturnType));
139 this.parameters = parameters;
140 delegate_type = delegateType;
143 public Expression Body {
147 public ReadOnlyCollection<ParameterExpression> Parameters {
148 get { return parameters; }
151 internal override void Emit (EmitContext ec)
154 ec.ig.Emit (OpCodes.Ret);
157 public Delegate Compile ()
159 if (lambda_delegate != null)
160 return lambda_delegate;
162 var ec = new EmitContext (this);
166 if (Environment.GetEnvironmentVariable ("LINQ_DBG") != null){
167 string fname = "linq" + (EmitContext.method_count-1) + ".dll";
168 AssemblyBuilder ab = Thread.GetDomain ().DefineDynamicAssembly (
169 new AssemblyName (fname), AssemblyBuilderAccess.RunAndSave, "/tmp");
171 ModuleBuilder b = ab.DefineDynamicModule (fname, fname);
172 TypeBuilder tb = b.DefineType ("LINQ", TypeAttributes.Public);
173 MethodBuilder mb = tb.DefineMethod ("GeneratedMethod", MethodAttributes.Static, Type, ec.ParamTypes);
174 ec.ig = mb.GetILGenerator ();
182 lambda_delegate = ec.CreateDelegate ();
183 return lambda_delegate;