1 files changed, 37 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/Reflection/MethodImplAttributes.cs b/src/mscorlib/shared/System/Reflection/MethodImplAttributes.cs
new file mode 100644
index 0000000000..a1ed326002
--- /dev/null
+++ b/src/mscorlib/shared/System/Reflection/MethodImplAttributes.cs
@@ -0,0 +1,37 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace System.Reflection
+{
+    // This Enum matchs the CorMethodImpl defined in CorHdr.h
+    public enum MethodImplAttributes
+    {
+        // code impl mask
+        CodeTypeMask = 0x0003,   // Flags about code type.   
+        IL = 0x0000,   // Method impl is IL.
+        Native = 0x0001,   // Method impl is native.     
+        OPTIL = 0x0002,   // Method impl is OPTIL 
+        Runtime = 0x0003,   // Method impl is provided by the runtime.
+                            // end code impl mask
+
+        // managed mask
+        ManagedMask = 0x0004,   // Flags specifying whether the code is managed or unmanaged.
+        Unmanaged = 0x0004,   // Method impl is unmanaged, otherwise managed.
+        Managed = 0x0000,   // Method impl is managed.
+                            // end managed mask
+
+        // implementation info and interop
+        ForwardRef = 0x0010,   // Indicates method is not defined; used primarily in merge scenarios.
+        PreserveSig = 0x0080,   // Indicates method sig is exported exactly as declared.
+
+        InternalCall = 0x1000,   // Internal Call...
+
+        Synchronized = 0x0020,   // Method is single threaded through the body.
+        NoInlining = 0x0008,   // Method may not be inlined.
+        AggressiveInlining = 0x0100,   // Method should be inlined if possible.
+        NoOptimization = 0x0040,   // Method may not be optimized.
+
+        MaxMethodImplVal = 0xffff,
+    }
+}