class/System.Core/System.Linq.Expressions/ElementInit.cs

   1 //
   2 // ElementInit.cs
   3 //
   4 // Author:
   5 //   Jb Evain (jbevain@novell.com)
   6 //
   7 // (C) 2008 Novell, Inc. (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.Collections.ObjectModel;
  31 using System.Reflection;
  32 using System.Reflection.Emit;
  33
  34 namespace System.Linq.Expressions {
  35
  36         public sealed class ElementInit {
  37
  38                 MethodInfo add_method;
  39                 ReadOnlyCollection<Expression> arguments;
  40
  41                 public MethodInfo AddMethod {
  42                         get { return add_method; }
  43                 }
  44
  45                 public ReadOnlyCollection<Expression> Arguments {
  46                         get { return arguments; }
  47                 }
  48
  49                 internal ElementInit (MethodInfo add_method, ReadOnlyCollection<Expression> arguments)
  50                 {
  51                         this.add_method = add_method;
  52                         this.arguments = arguments;
  53                 }
  54
  55                 public override string ToString ()
  56                 {
  57                         return ExpressionPrinter.ToString (this);
  58                 }
  59
  60                 void EmitPopIfNeeded (EmitContext ec)
  61                 {
  62                         if (add_method.ReturnType == typeof (void))
  63                                 return;
  64
  65                         ec.ig.Emit (OpCodes.Pop);
  66                 }
  67
  68                 internal void Emit (EmitContext ec, LocalBuilder local)
  69                 {
  70                         ec.EmitCall (local, arguments, add_method);
  71                         EmitPopIfNeeded (ec);
  72                 }
  73         }
  74 }