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// 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 {
// TypedReference is basically only ever seen on the call stack, and in param arrays.
// These are blob that must be dealt with by the compiler.
using System;
using System.Reflection;
using System.Runtime.CompilerServices;
using CultureInfo = System.Globalization.CultureInfo;
using FieldInfo = System.Reflection.FieldInfo;
using System.Security.Permissions;
using System.Runtime.Versioning;
using System.Diagnostics.Contracts;
[CLSCompliant(false)]
[System.Runtime.InteropServices.ComVisible(true)]
[System.Runtime.Versioning.NonVersionable] // This only applies to field layout
public struct TypedReference
{
private IntPtr Value;
private IntPtr Type;
[CLSCompliant(false)]
public static TypedReference MakeTypedReference(Object target, FieldInfo[] flds) {
if (target == null)
throw new ArgumentNullException(nameof(target));
if (flds == null)
throw new ArgumentNullException(nameof(flds));
Contract.EndContractBlock();
if (flds.Length == 0)
throw new ArgumentException(Environment.GetResourceString("Arg_ArrayZeroError"));
IntPtr[] fields = new IntPtr[flds.Length];
// For proper handling of Nullable<T> don't change GetType() to something like 'IsAssignableFrom'
// Currently we can't make a TypedReference to fields of Nullable<T>, which is fine.
RuntimeType targetType = (RuntimeType)target.GetType();
for (int i = 0; i < flds.Length; i++)
{
RuntimeFieldInfo field = flds[i] as RuntimeFieldInfo;
if (field == null)
throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeFieldInfo"));
if (field.IsInitOnly || field.IsStatic)
throw new ArgumentException(Environment.GetResourceString("Argument_TypedReferenceInvalidField"));
if (targetType != field.GetDeclaringTypeInternal() && !targetType.IsSubclassOf(field.GetDeclaringTypeInternal()))
throw new MissingMemberException(Environment.GetResourceString("MissingMemberTypeRef"));
RuntimeType fieldType = (RuntimeType)field.FieldType;
if (fieldType.IsPrimitive)
throw new ArgumentException(Environment.GetResourceString("Arg_TypeRefPrimitve"));
if (i < (flds.Length - 1) && !fieldType.IsValueType)
throw new MissingMemberException(Environment.GetResourceString("MissingMemberNestErr"));
fields[i] = field.FieldHandle.Value;
targetType = fieldType;
}
TypedReference result = new TypedReference ();
// reference to TypedReference is banned, so have to pass result as pointer
unsafe
{
InternalMakeTypedReference(&result, target, fields, targetType);
}
return result;
}
[MethodImplAttribute(MethodImplOptions.InternalCall)]
// reference to TypedReference is banned, so have to pass result as pointer
private unsafe static extern void InternalMakeTypedReference(void* result, Object target, IntPtr[] flds, RuntimeType lastFieldType);
public override int GetHashCode()
{
if (Type == IntPtr.Zero)
return 0;
else
return __reftype(this).GetHashCode();
}
public override bool Equals(Object o)
{
throw new NotSupportedException(Environment.GetResourceString("NotSupported_NYI"));
}
public unsafe static Object ToObject(TypedReference value)
{
return InternalToObject(&value);
}
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal unsafe extern static Object InternalToObject(void * value);
internal bool IsNull
{
get
{
return Value.IsNull() && Type.IsNull();
}
}
public static Type GetTargetType (TypedReference value)
{
return __reftype(value);
}
public static RuntimeTypeHandle TargetTypeToken (TypedReference value)
{
return __reftype(value).TypeHandle;
}
// This may cause the type to be changed.
[CLSCompliant(false)]
public unsafe static void SetTypedReference(TypedReference target, Object value)
{
InternalSetTypedReference(&target, value);
}
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal unsafe extern static void InternalSetTypedReference(void * target, Object value);
}
}
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