Tools/Castle.DynamicProxy2/Castle.DynamicProxy/Generators/Emitters/SimpleAST/IndirectReference.cs

   1 // Copyright 2004-2008 Castle Project - http://www.castleproject.org/
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 namespace Castle.DynamicProxy.Generators.Emitters.SimpleAST
  16 {
  17         using System;
  18         using System.Reflection.Emit;
  19
  20         /// <summary>
  21         /// Wraps a reference that is passed
  22         /// ByRef and provides indirect load/store support.
  23         /// </summary>
  24         public class IndirectReference : TypeReference
  25         {
  26                 public IndirectReference(TypeReference byRefReference) :
  27                         base(byRefReference, byRefReference.Type.GetElementType())
  28                 {
  29                         if (!byRefReference.Type.IsByRef)
  30                         {
  31                                 throw new ArgumentException("Expected an IsByRef reference", "byRefReference");
  32                         }
  33                 }
  34
  35                 // TODO: Better name
  36                 public static TypeReference WrapIfByRef(TypeReference reference)
  37                 {
  38                         return reference.Type.IsByRef ? new IndirectReference(reference) : reference;
  39                 }
  40
  41                 // TODO: Better name
  42                 public static TypeReference[] WrapIfByRef(TypeReference[] references)
  43                 {
  44                         TypeReference[] result = new TypeReference[references.Length];
  45
  46                         for(int i = 0; i < references.Length; i++)
  47                         {
  48                                 result[i] = WrapIfByRef(references[i]);
  49                         }
  50
  51                         return result;
  52                 }
  53
  54                 public override void LoadReference(ILGenerator gen)
  55                 {
  56                         OpCodeUtil.EmitLoadIndirectOpCodeForType(gen, Type);
  57                 }
  58
  59                 public override void StoreReference(ILGenerator gen)
  60                 {
  61                         OpCodeUtil.EmitStoreIndirectOpCodeForType(gen, Type);
  62                 }
  63
  64                 public override void LoadAddressOfReference(ILGenerator gen)
  65                 {
  66                         // Load of owner reference takes care of this.
  67                 }
  68         }
  69 }