1 files changed, 76 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Runtime/CompilerServices/MethodImplAttribute.cs b/src/mscorlib/src/System/Runtime/CompilerServices/MethodImplAttribute.cs
new file mode 100644
index 0000000000..0d38b4b26c
--- /dev/null
+++ b/src/mscorlib/src/System/Runtime/CompilerServices/MethodImplAttribute.cs
@@ -0,0 +1,76 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+namespace System.Runtime.CompilerServices {
+    
+    using System;
+    using System.Reflection;    
+    
+    // This Enum matchs the miImpl flags defined in corhdr.h. It is used to specify 
+    // certain method properties.
+    
+    [Serializable]
+    [Flags]
+[System.Runtime.InteropServices.ComVisible(true)]
+    public enum MethodImplOptions
+    {
+        Unmanaged          =   System.Reflection.MethodImplAttributes.Unmanaged,
+        ForwardRef         =   System.Reflection.MethodImplAttributes.ForwardRef,
+        PreserveSig        =   System.Reflection.MethodImplAttributes.PreserveSig,
+        InternalCall       =   System.Reflection.MethodImplAttributes.InternalCall,
+        Synchronized       =   System.Reflection.MethodImplAttributes.Synchronized,
+        NoInlining         =   System.Reflection.MethodImplAttributes.NoInlining,
+        [System.Runtime.InteropServices.ComVisible(false)]
+        AggressiveInlining =   System.Reflection.MethodImplAttributes.AggressiveInlining,
+        NoOptimization     =   System.Reflection.MethodImplAttributes.NoOptimization,
+        // **** If you add something, update internal MethodImplAttribute(MethodImplAttributes methodImplAttributes)! ****
+    }
+
+    [Serializable]
+[System.Runtime.InteropServices.ComVisible(true)]
+    public enum MethodCodeType
+    {
+        IL              =   System.Reflection.MethodImplAttributes.IL,
+        Native          =   System.Reflection.MethodImplAttributes.Native,
+        /// <internalonly/>
+        OPTIL           =   System.Reflection.MethodImplAttributes.OPTIL,
+        Runtime         =   System.Reflection.MethodImplAttributes.Runtime  
+    }
+
+    // Custom attribute to specify additional method properties.
+[Serializable]
+[AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor, Inherited = false)] 
+[System.Runtime.InteropServices.ComVisible(true)]
+    sealed public class MethodImplAttribute : Attribute  
+    {    
+        internal MethodImplOptions  _val;
+        public   MethodCodeType     MethodCodeType;
+
+        internal MethodImplAttribute(MethodImplAttributes methodImplAttributes)
+        {
+            MethodImplOptions all = 
+                MethodImplOptions.Unmanaged | MethodImplOptions.ForwardRef | MethodImplOptions.PreserveSig | 
+                MethodImplOptions.InternalCall | MethodImplOptions.Synchronized |
+                MethodImplOptions.NoInlining | MethodImplOptions.AggressiveInlining |
+                MethodImplOptions.NoOptimization;
+            _val = ((MethodImplOptions)methodImplAttributes) & all;
+        }
+        
+        public MethodImplAttribute(MethodImplOptions methodImplOptions)
+        {
+            _val = methodImplOptions;
+        }
+        
+        public MethodImplAttribute(short value)
+        {
+            _val = (MethodImplOptions)value;
+        }
+        
+        public MethodImplAttribute()
+        {
+        }
+        
+        public MethodImplOptions Value { get {return _val;} }   
+    }
+
+}