mcs/class/corlib/System.Reflection/FieldInfo.cs

   1 //
   2 // System.Reflection.FieldInfo.cs
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //
   7 // (C) Ximian, Inc.  http://www.ximian.com
   8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   9 // Copyright 2011 Xamarin Inc (http://www.xamarin.com).
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29
  30 using System.Collections.Generic;
  31 using System.Diagnostics;
  32 using System.Globalization;
  33 using System.Runtime.CompilerServices;
  34 using System.Runtime.InteropServices;
  35
  36 namespace System.Reflection {
  37
  38         [Serializable]
  39         partial class FieldInfo : MemberInfo {
  40
  41                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  42                 private static extern FieldInfo internal_from_handle_type (IntPtr field_handle, IntPtr type_handle);
  43
  44                 public static FieldInfo GetFieldFromHandle (RuntimeFieldHandle handle)
  45                 {
  46                         if (handle.Value == IntPtr.Zero)
  47                                 throw new ArgumentException ("The handle is invalid.");
  48                         return internal_from_handle_type (handle.Value, IntPtr.Zero);
  49                 }
  50
  51                 [ComVisible (false)]
  52                 public static FieldInfo GetFieldFromHandle (RuntimeFieldHandle handle, RuntimeTypeHandle declaringType)
  53                 {
  54                         if (handle.Value == IntPtr.Zero)
  55                                 throw new ArgumentException ("The handle is invalid.");
  56                         FieldInfo fi = internal_from_handle_type (handle.Value, declaringType.Value);
  57                         if (fi == null)
  58                                 throw new ArgumentException ("The field handle and the type handle are incompatible.");
  59                         return fi;
  60                 }
  61
  62                 internal virtual int GetFieldOffset ()
  63                 {
  64                         throw new SystemException ("This method should not be called");
  65                 }
  66
  67                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  68                 private extern MarshalAsAttribute get_marshal_info ();
  69
  70                 internal object[] GetPseudoCustomAttributes ()
  71                 {
  72                         int count = 0;
  73
  74                         if (IsNotSerialized)
  75                                 count ++;
  76
  77                         if (DeclaringType.IsExplicitLayout)
  78                                 count ++;
  79
  80                         MarshalAsAttribute marshalAs = get_marshal_info ();
  81                         if (marshalAs != null)
  82                                 count ++;
  83
  84                         if (count == 0)
  85                                 return null;
  86                         object[] attrs = new object [count];
  87                         count = 0;
  88
  89                         if (IsNotSerialized)
  90                                 attrs [count ++] = new NonSerializedAttribute ();
  91                         if (DeclaringType.IsExplicitLayout)
  92                                 attrs [count ++] = new FieldOffsetAttribute (GetFieldOffset ());
  93                         if (marshalAs != null)
  94                                 attrs [count ++] = marshalAs;
  95
  96                         return attrs;
  97                 }
  98
  99                 internal CustomAttributeData[] GetPseudoCustomAttributesData ()
 100                 {
 101                         int count = 0;
 102
 103                         if (IsNotSerialized)
 104                                 count++;
 105
 106                         if (DeclaringType.IsExplicitLayout)
 107                                 count++;
 108
 109                         MarshalAsAttribute marshalAs = get_marshal_info ();
 110                         if (marshalAs != null)
 111                                 count++;
 112
 113                         if (count == 0)
 114                                 return null;
 115                         CustomAttributeData[] attrsData = new CustomAttributeData [count];
 116                         count = 0;
 117
 118                         if (IsNotSerialized)
 119                                 attrsData [count++] = new CustomAttributeData ((typeof (NonSerializedAttribute)).GetConstructor (Type.EmptyTypes));
 120                         if (DeclaringType.IsExplicitLayout) {
 121                                 var ctorArgs = new CustomAttributeTypedArgument[] { new CustomAttributeTypedArgument (typeof (int), GetFieldOffset ()) };
 122                                 attrsData [count++] = new CustomAttributeData (
 123                                         (typeof (FieldOffsetAttribute)).GetConstructor (new[] { typeof (int) }),
 124                                         ctorArgs,
 125                                         EmptyArray<CustomAttributeNamedArgument>.Value);
 126                         }
 127
 128                         if (marshalAs != null) {
 129                                 var ctorArgs = new CustomAttributeTypedArgument[] { new CustomAttributeTypedArgument (typeof (UnmanagedType), marshalAs.Value) };
 130                                 attrsData [count++] = new CustomAttributeData (
 131                                         (typeof (MarshalAsAttribute)).GetConstructor (new[] { typeof (UnmanagedType) }),
 132                                         ctorArgs,
 133                                         EmptyArray<CustomAttributeNamedArgument>.Value);//FIXME Get named params
 134                         }
 135
 136                         return attrsData;
 137                 }
 138
 139         }
 140 }