Merge pull request #457 from strawd/aspnetwebstack-resources

[mono.git] / mcs / class / System.Core / System.Linq.Expressions / ParameterExpression.cs

diff --git a/mcs/class/System.Core/System.Linq.Expressions/ParameterExpression.cs b/mcs/class/System.Core/System.Linq.Expressions/ParameterExpression.cs
index 3ff5c1f70ef7eba36ef023ae8271c1f7e66867c1..651f9a90b94c71532848e5db6b2e75cd070b5b62 100644 (file)
--- a/mcs/class/System.Core/System.Linq.Expressions/ParameterExpression.cs
+++ b/mcs/class/System.Core/System.Linq.Expressions/ParameterExpression.cs
@@ -1,3 +1,12 @@
+//
+// ParameterExpression.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
@@ -5,55 +14,73 @@
 // 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
-//
-// Authors:
-//        Marek Safar (marek.safar@seznam.cz)
-//        Antonello Provenzano  <antonello@deveel.com>
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 //
 
 using System;
-using System.Text;
-
-namespace System.Linq.Expressions
-{
-    public sealed class ParameterExpression : Expression
-    {
-        #region .ctor
-        internal ParameterExpression(Type type, string name)
-            : base(ExpressionType.Parameter, type) {
-            this.name = name;
-        }
-        #endregion
-
-        #region Fields
-        private string name;
-        #endregion
-
-        #region Properties
-        public string Name
-        {
-            get { return name; }
-        }
-        #endregion
-
-        #region Internal Methods
-        internal override void BuildString(StringBuilder builder)
-        {
-            string param = name;
-            if (param == null)
-                param = "<param>";
-            builder.Append(param);
-        }
-        #endregion
-    }
+using System.Reflection.Emit;
+
+namespace System.Linq.Expressions {
+
+       public sealed class ParameterExpression : Expression {
+
+               string name;
+
+               public string Name {
+                       get { return name; }
+               }
+
+               internal ParameterExpression (Type type, string name)
+                       : base (ExpressionType.Parameter, type)
+               {
+                       this.name = name;
+               }
+
+               void EmitLocalParameter (EmitContext ec, int position)
+               {
+                       ec.ig.Emit (OpCodes.Ldarg, position);
+               }
+
+               void EmitHoistedLocal (EmitContext ec, int level, int position)
+               {
+                       ec.EmitScope ();
+
+                       for (int i = 0; i < level; i++)
+                               ec.EmitParentScope ();
+
+                       ec.EmitLoadLocals ();
+
+                       ec.ig.Emit (OpCodes.Ldc_I4, position);
+                       ec.ig.Emit (OpCodes.Ldelem, typeof (object));
+
+                       ec.EmitLoadStrongBoxValue (Type);
+               }
+
+               internal override void Emit (EmitContext ec)
+               {
+                       int position = -1;
+                       if (ec.IsLocalParameter (this, ref position)) {
+                               EmitLocalParameter (ec, position);
+                               return;
+                       }
+
+                       int level = 0;
+                       if (ec.IsHoistedLocal (this, ref level, ref position)) {
+                               EmitHoistedLocal (ec, level, position);
+                               return;
+                       }
+
+                       throw new InvalidOperationException ("Parameter out of scope");
+               }
+       }
 }