mcs/class/corlib/System/RuntimeFieldHandle.cs

   1 //
   2 // System.RuntimeFieldHandle.cs
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //
   8 // (C) Ximian, Inc.  http://www.ximian.com
   9 //
  10
  11 //
  12 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34 using System.Reflection;
  35 using System.Runtime.Serialization;
  36 using System.Runtime.InteropServices;
  37 using System.Runtime.ConstrainedExecution;
  38 using System.Runtime.CompilerServices;
  39
  40 namespace System
  41 {
  42         [ComVisible (true)]
  43         [Serializable]
  44         public struct RuntimeFieldHandle : ISerializable
  45         {
  46                 IntPtr value;
  47
  48                 internal RuntimeFieldHandle (IntPtr v)
  49                 {
  50                         value = v;
  51                 }
  52
  53                 RuntimeFieldHandle (SerializationInfo info, StreamingContext context)
  54                 {
  55                         if (info == null)
  56                                 throw new ArgumentNullException ("info");
  57
  58                         RuntimeFieldInfo mf = ((RuntimeFieldInfo) info.GetValue ("FieldObj", typeof (RuntimeFieldInfo)));
  59                         value = mf.FieldHandle.Value;
  60                         if (value == IntPtr.Zero)
  61                                 throw new SerializationException ("Insufficient state.");
  62                 }
  63
  64                 public IntPtr Value {
  65                         get {
  66                                 return value;
  67                         }
  68                 }
  69
  70                 internal bool IsNullHandle ()
  71                 {
  72                         return value == IntPtr.Zero;
  73                 }
  74
  75                 public void GetObjectData (SerializationInfo info, StreamingContext context)
  76                 {
  77                         if (info == null)
  78                                 throw new ArgumentNullException ("info");
  79
  80                         if (value == IntPtr.Zero)
  81                                 throw new SerializationException ("Object fields may not be properly initialized");
  82
  83                         info.AddValue ("FieldObj", (RuntimeFieldInfo) FieldInfo.GetFieldFromHandle (this), typeof (RuntimeFieldInfo));
  84                 }
  85
  86                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
  87                 public override bool Equals (object obj)
  88                 {
  89                         if (obj == null || GetType () != obj.GetType ())
  90                                 return false;
  91
  92                         return value == ((RuntimeFieldHandle)obj).Value;
  93                 }
  94
  95                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
  96                 public bool Equals (RuntimeFieldHandle handle)
  97                 {
  98                         return value == handle.Value;
  99                 }
 100
 101                 public override int GetHashCode ()
 102                 {
 103                         return value.GetHashCode ();
 104                 }
 105
 106                 public static bool operator == (RuntimeFieldHandle left, RuntimeFieldHandle right)
 107                 {
 108                         return left.Equals (right);
 109                 }
 110
 111                 public static bool operator != (RuntimeFieldHandle left, RuntimeFieldHandle right)
 112                 {
 113                         return !left.Equals (right);
 114                 }
 115
 116                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 117                 static extern void SetValueInternal (FieldInfo fi, object obj, object value);
 118
 119                 internal static void SetValue (RuntimeFieldInfo field, Object obj, Object value, RuntimeType fieldType, FieldAttributes fieldAttr, RuntimeType declaringType, ref bool domainInitialized)
 120                 {
 121                         SetValueInternal (field, obj, value);
 122                 }
 123
 124                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 125                 static unsafe extern internal Object GetValueDirect (RuntimeFieldInfo field, RuntimeType fieldType, void *pTypedRef, RuntimeType contextType);
 126
 127                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 128                 static unsafe extern internal void SetValueDirect (RuntimeFieldInfo field, RuntimeType fieldType, void* pTypedRef, Object value, RuntimeType contextType);
 129         }
 130
 131 }