src/Boo.Lang/Runtime/SetFieldEmitter.cs

   1 #region license
   2 // Copyright (c) 2003, 2004, 2005 Rodrigo B. de Oliveira (rbo@acm.org)
   3 // All rights reserved.
   4 //
   5 // Redistribution and use in source and binary forms, with or without modification,
   6 // are permitted provided that the following conditions are met:
   7 //
   8 //     * Redistributions of source code must retain the above copyright notice,
   9 //     this list of conditions and the following disclaimer.
  10 //     * Redistributions in binary form must reproduce the above copyright notice,
  11 //     this list of conditions and the following disclaimer in the documentation
  12 //     and/or other materials provided with the distribution.
  13 //     * Neither the name of Rodrigo B. de Oliveira nor the names of its
  14 //     contributors may be used to endorse or promote products derived from this
  15 //     software without specific prior written permission.
  16 //
  17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  18 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
  21 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  23 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  24 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  25 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26 // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27 #endregion
  28
  29
  30 using System;
  31 using System.Reflection;
  32 using System.Reflection.Emit;
  33
  34 namespace Boo.Lang.Runtime
  35 {
  36         class SetFieldEmitter : DispatcherEmitter
  37         {
  38                 private readonly FieldInfo _field;
  39                 private Type _argumentType;
  40
  41                 public SetFieldEmitter(FieldInfo field, Type argumentType)
  42                         : base(field.DeclaringType, field.Name + "=")
  43                 {
  44                         _field = field;
  45                         _argumentType = argumentType;
  46                 }
  47
  48                 protected override void EmitMethodBody()
  49                 {
  50                         LocalBuilder value = DeclareLocal(_field.FieldType);
  51                         EmitLoadValue();
  52                         StoreLocal(value);
  53
  54                         if (_field.IsStatic)
  55                         {
  56                                 LoadLocal(value);
  57                                 _il.Emit(OpCodes.Stsfld, _field);
  58                         }
  59                         else
  60                         {
  61                                 EmitLoadTargetObject(_field.DeclaringType);
  62                                 LoadLocal(value);
  63                                 _il.Emit(OpCodes.Stfld, _field);
  64                         }
  65
  66                         LoadLocal(value);
  67                         EmitReturn(_field.FieldType);
  68                 }
  69
  70                 private void EmitLoadValue()
  71                 {
  72                         EmitArgArrayElement(0);
  73                         EmitCoercion(_argumentType, _field.FieldType, CandidateMethod.CalculateArgumentScore(_field.FieldType, _argumentType));
  74                 }
  75         }
  76 }