mcs/class/corlib/System.Runtime.CompilerServices/RuntimeHelpers.cs

   1 // System.Runtime.CompilerServices.RuntimeHelpers
   2 //
   3 // Sean MacIsaac (macisaac@ximian.com)
   4 // Paolo Molaro (lupus@ximian.com)
   5 //
   6 // (C) Ximian, Inc. 2001
   7
   8 //
   9 // Copyright (C) 2004 Novell, Inc (http://www.novell.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
  31 using System.Runtime.ConstrainedExecution;
  32 using System.Reflection;
  33
  34 namespace System.Runtime.CompilerServices
  35 {
  36         public static class RuntimeHelpers
  37         {
  38                 public delegate void TryCode (Object userData);
  39
  40                 public delegate void CleanupCode (Object userData, bool exceptionThrown);
  41
  42                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  43                 static extern void InitializeArray (Array array, IntPtr fldHandle);
  44
  45                 public static void InitializeArray (Array array, RuntimeFieldHandle fldHandle)
  46                 {
  47                         if ((array == null) || (fldHandle.Value == IntPtr.Zero))
  48                                 throw new ArgumentNullException ();
  49
  50                         InitializeArray (array, fldHandle.Value);
  51                 }
  52
  53                 public static extern int OffsetToStringData {
  54                         [MethodImpl (MethodImplOptions.InternalCall)]
  55                         get;
  56                 }
  57
  58                 public static int GetHashCode (object o) {
  59                         return Object.InternalGetHashCode (o);
  60                 }
  61
  62                 public static new bool Equals (object o1, object o2) {
  63                         // LAMESPEC: According to MSDN, this is equivalent to
  64                         // Object::Equals (). But the MS version of Object::Equals()
  65                         // includes the functionality of ValueType::Equals(), while
  66                         // our version does not.
  67                         if (o1 == o2)
  68                                 return true;
  69                         if ((o1 == null) || (o2 == null))
  70                                 return false;
  71                         if (o1 is ValueType)
  72                                 return ValueType.DefaultEquals (o1, o2);
  73                         else
  74                                 return Object.Equals (o1, o2);
  75                 }
  76
  77                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  78                 public static extern object GetObjectValue (object obj);
  79
  80                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  81                 static extern void RunClassConstructor (IntPtr type);
  82
  83                 public static void RunClassConstructor (RuntimeTypeHandle type)
  84                 {
  85                         if (type.Value == IntPtr.Zero)
  86                                 throw new ArgumentException ("Handle is not initialized.", "type");
  87
  88                         RunClassConstructor (type.Value);
  89                 }
  90
  91 #if NET_4_0
  92                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
  93                 static extern bool SufficientExecutionStack ();
  94
  95                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  96                 public static void EnsureSufficientExecutionStack ()
  97                 {
  98                         if (SufficientExecutionStack ())
  99                                 return;
 100                         throw new InsufficientExecutionStackException ();
 101                 }
 102 #endif
 103
 104                 [MonoTODO("Currently a no-op")]
 105                 public static void ExecuteCodeWithGuaranteedCleanup (TryCode code, CleanupCode backoutCode, Object userData)
 106                 {
 107                 }
 108
 109                 [MonoTODO("Currently a no-op")]
 110                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
 111                 public static void PrepareConstrainedRegions ()
 112                 {
 113                 }
 114
 115                 [MonoTODO("Currently a no-op")]
 116                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
 117                 public static void PrepareConstrainedRegionsNoOP ()
 118                 {
 119                 }
 120
 121                 [MonoTODO("Currently a no-op")]
 122                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.MayFail)]
 123                 public static void ProbeForSufficientStack()
 124                 {
 125                 }
 126
 127                 [MonoTODO("Currently a no-op")]
 128                 public static void PrepareDelegate (Delegate d)
 129                 {
 130                         if (d == null)
 131                                 throw new ArgumentNullException ("d");
 132                 }
 133
 134                 [MonoTODO("Currently a no-op")]
 135                 public static void PrepareMethod (RuntimeMethodHandle method)
 136                 {
 137                 }
 138
 139                 [MonoTODO("Currently a no-op")]
 140                 public static void PrepareMethod (RuntimeMethodHandle method, RuntimeTypeHandle[] instantiation)
 141                 {
 142                 }
 143
 144                 public static void RunModuleConstructor (ModuleHandle module)
 145                 {
 146                         if (module == ModuleHandle.EmptyHandle)
 147                                 throw new ArgumentException ("Handle is not initialized.", "module");
 148
 149                         RunModuleConstructor (module.Value);
 150                 }
 151
 152                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 153                 static extern void RunModuleConstructor (IntPtr module);
 154         }
 155 }