Move GetRefAny (with FCThrow) to managed

src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/CastHelpers.cs

@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System;
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.InteropServices;
@@ -24,6 +25,9 @@ internal static void ThrowInvalidCastException(object fromType, void* toTypeHnd)
             throw null!; // Provide hint to the inliner that this method does not return
         }
 
+        [DoesNotReturn]
+        private static void ThrowInvalidCastException() => throw new InvalidCastException();
+
         [MethodImpl(MethodImplOptions.InternalCall)]
         private static extern object IsInstanceOfAny_NoCacheLookup(void* toTypeHnd, object obj);
 
@@ -33,6 +37,16 @@ internal static void ThrowInvalidCastException(object fromType, void* toTypeHnd)
         [MethodImpl(MethodImplOptions.InternalCall)]
         private static extern void WriteBarrier(ref object? dst, object? obj);
 
+        internal static ref byte GetRefAny(IntPtr clsHnd, TypedReference typedByRef)
+        {
+            if (clsHnd != typedByRef.Type)
+            {
+                ThrowInvalidCastException();
+            }
+
+            return ref typedByRef.Value;
+        }
+
         // IsInstanceOf test used for unusual cases (naked type parameters, variant generic types)
         // Unlike the IsInstanceOfInterface and IsInstanceOfClass functions,
         // this test must deal with all kinds of type tests

src/coreclr/System.Private.CoreLib/src/System/TypedReference.CoreCLR.cs

@@ -16,6 +16,9 @@ public ref partial struct TypedReference
         private readonly ref byte _value;
         private readonly IntPtr _type;
 
+        internal readonly IntPtr Type => _type;
+        internal readonly ref byte Value => ref _value;
+
         private TypedReference(ref byte target, RuntimeType type)
         {
             _value = ref target;

src/coreclr/inc/jithelpers.h

@@ -117,7 +117,7 @@
     DYNAMICJITHELPER(CORINFO_HELP_UNBOX_TYPETEST,NULL,              METHOD__CASTHELPERS__UNBOX_TYPETEST)
     DYNAMICJITHELPER(CORINFO_HELP_UNBOX_NULLABLE,NULL,              METHOD__CASTHELPERS__UNBOX_NULLABLE)
 
-    JITHELPER(CORINFO_HELP_GETREFANY,           JIT_GetRefAny,      METHOD__NIL)
+    DYNAMICJITHELPER(CORINFO_HELP_GETREFANY,    NULL,               METHOD__CASTHELPERS__GETREFANY)
     DYNAMICJITHELPER(CORINFO_HELP_ARRADDR_ST,   NULL,               METHOD__CASTHELPERS__STELEMREF)
     DYNAMICJITHELPER(CORINFO_HELP_LDELEMA_REF,  NULL,               METHOD__CASTHELPERS__LDELEMAREF)
 

src/coreclr/vm/corelib.h

@@ -1178,8 +1178,9 @@ DEFINE_METHOD(CASTHELPERS, UNBOX,            Unbox,                       NoSig)
 DEFINE_METHOD(CASTHELPERS, STELEMREF,        StelemRef,                   SM_ArrObject_IntPtr_Obj_RetVoid)
 DEFINE_METHOD(CASTHELPERS, LDELEMAREF,       LdelemaRef,                  SM_ArrObject_IntPtr_PtrVoid_RetRefObj)
 DEFINE_METHOD(CASTHELPERS, ARRAYTYPECHECK,   ArrayTypeCheck,              SM_Obj_Array_RetVoid)
-DEFINE_METHOD(CASTHELPERS, UNBOX_NULLABLE,   Unbox_Nullable, NoSig)
-DEFINE_METHOD(CASTHELPERS, UNBOX_TYPETEST,   Unbox_TypeTest, NoSig)
+DEFINE_METHOD(CASTHELPERS, UNBOX_NULLABLE,   Unbox_Nullable,              NoSig)
+DEFINE_METHOD(CASTHELPERS, UNBOX_TYPETEST,   Unbox_TypeTest,              NoSig)
+DEFINE_METHOD(CASTHELPERS, GETREFANY,        GetRefAny,                   NoSig)
 
 DEFINE_CLASS(VIRTUALDISPATCHHELPERS, CompilerServices, VirtualDispatchHelpers)
 DEFINE_METHOD(VIRTUALDISPATCHHELPERS, VIRTUALFUNCTIONPOINTER, VirtualFunctionPointer, NoSig)

src/coreclr/vm/jithelpers.cpp

@@ -1382,24 +1382,6 @@ HCIMPL2(Object*, JIT_Box, CORINFO_CLASS_HANDLE type, void* unboxedData)
 }
 HCIMPLEND
 
-/*************************************************************/
-HCIMPL2_IV(LPVOID, JIT_GetRefAny, CORINFO_CLASS_HANDLE type, TypedByRef typedByRef)
-{
-    FCALL_CONTRACT;
-
-    TypeHandle clsHnd(type);
-    // <TODO>@TODO right now we check for precisely the correct type.
-    // do we want to allow inheritance?  (watch out since value
-    // classes inherit from object but do not normal object layout).</TODO>
-    if (clsHnd != typedByRef.type) {
-        FCThrow(kInvalidCastException);
-    }
-
-    return(typedByRef.data);
-}
-HCIMPLEND
-
-
 /*************************************************************/
 HCIMPL2(BOOL, JIT_IsInstanceOfException, CORINFO_CLASS_HANDLE type, Object* obj)
 {