Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / TypedReference.cs / 1 / TypedReference.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== 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; [CLSCompliant(false)] [System.Runtime.InteropServices.ComVisible(true)] public struct TypedReference { private IntPtr Value; private IntPtr Type; [CLSCompliant(false)] [ReflectionPermission(SecurityAction.LinkDemand, MemberAccess=true)] public static TypedReference MakeTypedReference(Object target, FieldInfo[] flds) { if (target == null) throw new ArgumentNullException("target"); if (flds == null) throw new ArgumentNullException("flds"); if (flds.Length == 0) throw new ArgumentException(Environment.GetResourceString("Arg_ArrayZeroError")); else { RuntimeFieldHandle[] fields = new RuntimeFieldHandle[flds.Length]; // For proper handling of Nullabledon't change GetType() to something like 'IsAssignableFrom' // Currently we can't make a TypedReference to fields of Nullable , which is fine. Type targetType = target.GetType(); for (int i = 0; i < flds.Length; i++) { FieldInfo field = flds[i]; if (!(field is RuntimeFieldInfo)) throw new ArgumentException(Environment.GetResourceString("Argument_MustBeRuntimeFieldInfo")); else if (field.IsInitOnly || field.IsStatic) throw new ArgumentException(Environment.GetResourceString("Argument_TypedReferenceInvalidField")); if (targetType != field.DeclaringType && !targetType.IsSubclassOf(field.DeclaringType)) throw new MissingMemberException(Environment.GetResourceString("MissingMemberTypeRef")); Type fieldType = field.FieldType; if (fieldType.IsPrimitive) throw new ArgumentException(Environment.GetResourceString("Arg_TypeRefPrimitve")); if (i < flds.Length - 1) if (!fieldType.IsValueType) throw new MissingMemberException(Environment.GetResourceString("MissingMemberNestErr")); fields[i] = field.FieldHandle; targetType = fieldType; } TypedReference result = new TypedReference (); // reference to TypedReference is banned, so have to pass result as pointer unsafe { InternalMakeTypedReference(&result, target, fields, targetType.TypeHandle); } 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, RuntimeFieldHandle[] flds, RuntimeTypeHandle 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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