mcs/class/corlib/System/RuntimeTypeHandle.cs

   1 //
   2 // System.RuntimeTypeHandle.cs
   3 //
   4 // Authors:
   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.Runtime.Serialization;
  35 using System.Runtime.InteropServices;
  36 using System.Runtime.ConstrainedExecution;
  37 using System.Threading;
  38 using System.Runtime.CompilerServices;
  39 using System.Reflection;
  40 using System.Diagnostics.Contracts;
  41
  42 namespace System
  43 {
  44         [ComVisible (true)]
  45         [Serializable]
  46         public struct RuntimeTypeHandle : ISerializable
  47         {
  48                 IntPtr value;
  49
  50                 internal RuntimeTypeHandle (IntPtr val)
  51                 {
  52                         value = val;
  53                 }
  54
  55                 internal RuntimeTypeHandle (RuntimeType type)
  56                         : this (type._impl.value)
  57                 {
  58                 }
  59
  60                 RuntimeTypeHandle (SerializationInfo info, StreamingContext context)
  61                 {
  62                         if (info == null)
  63                                 throw new ArgumentNullException ("info");
  64
  65                         RuntimeType mt = ((RuntimeType) info.GetValue ("TypeObj", typeof (RuntimeType)));
  66                         value = mt.TypeHandle.Value;
  67                         if (value == IntPtr.Zero)
  68                                 throw new SerializationException (Locale.GetText ("Insufficient state."));
  69                 }
  70
  71                 public IntPtr Value {
  72                         get {
  73                                 return value;
  74                         }
  75                 }
  76
  77                 public void GetObjectData (SerializationInfo info, StreamingContext context)
  78                 {
  79                         if (info == null)
  80                                 throw new ArgumentNullException ("info");
  81
  82                         if (value == IntPtr.Zero)
  83                                 throw new SerializationException ("Object fields may not be properly initialized");
  84
  85                         info.AddValue ("TypeObj", Type.GetTypeHandle (this), typeof (RuntimeType));
  86                 }
  87
  88                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
  89                 public override bool Equals (object obj)
  90                 {
  91                         if (obj == null || GetType () != obj.GetType ())
  92                                 return false;
  93
  94                         return value == ((RuntimeTypeHandle)obj).Value;
  95                 }
  96
  97                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
  98                 public bool Equals (RuntimeTypeHandle handle)
  99                 {
 100                         return value == handle.Value;
 101                 }
 102
 103                 public override int GetHashCode ()
 104                 {
 105                         return value.GetHashCode ();
 106                 }
 107
 108                 public static bool operator == (RuntimeTypeHandle left, Object right)
 109                 {
 110                         return (right != null) && (right is RuntimeTypeHandle) && left.Equals ((RuntimeTypeHandle)right);
 111                 }
 112
 113                 public static bool operator != (RuntimeTypeHandle left, Object right)
 114                 {
 115                         return (right == null) || !(right is RuntimeTypeHandle) || !left.Equals ((RuntimeTypeHandle)right);
 116                 }
 117
 118                 public static bool operator == (Object left, RuntimeTypeHandle right)
 119                 {
 120                         return (left != null) && (left is RuntimeTypeHandle) && ((RuntimeTypeHandle)left).Equals (right);
 121                 }
 122
 123                 public static bool operator != (Object left, RuntimeTypeHandle right)
 124                 {
 125                         return (left == null) || !(left is RuntimeTypeHandle) || !((RuntimeTypeHandle)left).Equals (right);
 126                 }
 127
 128                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 129                 internal static extern TypeAttributes GetAttributes (RuntimeType type);
 130
 131                 [CLSCompliant (false)]
 132                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 133                 public ModuleHandle GetModuleHandle ()
 134                 {
 135                         // Although MS' runtime is crashing here, we prefer throwing an exception.
 136                         // The check is needed because Type.GetTypeFromHandle returns null
 137                         // for zero handles.
 138                         if (value == IntPtr.Zero)
 139                                 throw new InvalidOperationException ("Object fields may not be properly initialized");
 140
 141                         return Type.GetTypeFromHandle (this).Module.ModuleHandle;
 142                 }
 143
 144                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 145                 static extern int GetMetadataToken (RuntimeType type);
 146
 147                 internal static int GetToken (RuntimeType type)
 148                 {
 149                         return GetMetadataToken (type);
 150                 }
 151
 152                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 153                 extern static Type GetGenericTypeDefinition_impl (RuntimeType type);
 154
 155                 internal static Type GetGenericTypeDefinition (RuntimeType type)
 156                 {
 157                         return GetGenericTypeDefinition_impl (type);
 158                 }
 159
 160                 internal static bool HasElementType (RuntimeType type)
 161                 {
 162                         return IsArray (type) || IsByRef (type) || IsPointer (type);
 163                 }
 164
 165                 internal static bool HasProxyAttribute (RuntimeType type)
 166                 {
 167                         throw new NotImplementedException ("HasProxyAttribute");
 168                 }
 169
 170                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 171                 internal extern static bool HasInstantiation (RuntimeType type);
 172
 173                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 174                 internal extern static bool IsArray(RuntimeType type);
 175
 176                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 177                 internal extern static bool IsByRef (RuntimeType type);
 178
 179                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 180                 internal extern static bool IsComObject (RuntimeType type);
 181
 182                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 183                 internal extern static bool IsInstanceOfType (RuntimeType type, Object o);
 184
 185                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 186                 internal extern static bool IsPointer (RuntimeType type);
 187
 188                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 189                 internal extern static bool IsPrimitive (RuntimeType type);
 190
 191                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 192                 internal extern static bool HasReferences (RuntimeType type);
 193
 194                 internal static bool IsComObject (RuntimeType type, bool isGenericCOM)
 195                 {
 196                         return isGenericCOM ? false : IsComObject (type);
 197                 }
 198
 199                 internal static bool IsContextful (RuntimeType type)
 200                 {
 201                         return typeof (ContextBoundObject).IsAssignableFrom (type);
 202                 }
 203
 204                 internal static bool IsEquivalentTo (RuntimeType rtType1, RuntimeType rtType2)
 205                 {
 206                         // refence check is done earlier and we don't recognize anything else
 207                         return false;
 208                 }
 209
 210                 internal static bool IsSzArray(RuntimeType type)
 211                 {
 212                         // TODO: Better check
 213                         return IsArray (type) && type.GetArrayRank () == 1;
 214                 }
 215
 216                 internal static bool IsInterface (RuntimeType type)
 217                 {
 218                         return (type.Attributes & TypeAttributes.ClassSemanticsMask) == TypeAttributes.Interface;
 219                 }
 220
 221                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 222                 internal extern static int GetArrayRank(RuntimeType type);
 223
 224                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 225                 internal extern static RuntimeAssembly GetAssembly (RuntimeType type);
 226
 227                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 228                 internal extern static RuntimeType GetElementType (RuntimeType type);
 229
 230                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 231                 internal extern static RuntimeModule GetModule (RuntimeType type);
 232
 233                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 234                 internal extern static bool IsGenericVariable (RuntimeType type);
 235
 236                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 237                 internal extern static RuntimeType GetBaseType (RuntimeType type);
 238
 239                 internal static bool CanCastTo (RuntimeType type, RuntimeType target)
 240                 {
 241                         return type_is_assignable_from (target, type);
 242                 }
 243
 244                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 245                 static extern bool type_is_assignable_from (Type a, Type b);
 246
 247                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 248                 internal extern static bool IsGenericTypeDefinition (RuntimeType type);
 249
 250                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 251                 internal extern static IntPtr GetGenericParameterInfo (RuntimeType type);
 252
 253         }
 254 }