Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / TypedReference.cs / 1305376 / 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; using System.Runtime.Versioning; using System.Diagnostics.Contracts; [CLSCompliant(false)] [System.Runtime.InteropServices.ComVisible(true)] public struct TypedReference { private IntPtr Value; private IntPtr Type; [System.Security.SecurityCritical] // auto-generated_required [CLSCompliant(false)] public static TypedReference MakeTypedReference(Object target, FieldInfo[] flds) { if (target == null) throw new ArgumentNullException("target"); if (flds == null) throw new ArgumentNullException("flds"); Contract.EndContractBlock(); if (flds.Length == 0) throw new ArgumentException(Environment.GetResourceString("Arg_ArrayZeroError")); else { IntPtr[] fields = new IntPtr[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.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.TypeHandle.GetRuntimeType()); } return result; } } [System.Security.SecurityCritical] // auto-generated [ResourceExposure(ResourceScope.None)] [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")); } [System.Security.SecuritySafeCritical] // auto-generated public unsafe static Object ToObject(TypedReference value) { return InternalToObject(&value); } [System.Security.SecurityCritical] // auto-generated [ResourceExposure(ResourceScope.None)] [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. [System.Security.SecuritySafeCritical] // auto-generated [CLSCompliant(false)] public unsafe static void SetTypedReference(TypedReference target, Object value) { InternalSetTypedReference(&target, value); } [System.Security.SecurityCritical] // auto-generated [ResourceExposure(ResourceScope.None)] [MethodImplAttribute(MethodImplOptions.InternalCall)] internal unsafe extern static void InternalSetTypedReference(void * target, Object value); // Internal method for getting a raw pointer for handles in JitHelpers. // The reference has to point into a local stack variable in order so it can not be moved by the GC. [System.Security.SecurityCritical] // auto-generated internal IntPtr GetPointerOnStack() { #if _DEBUG Contract.Assert(IsAddressInStack(Value), "Pointer not in the stack!"); #endif return Value; } #if _DEBUG [System.Security.SecurityCritical] // auto-generated [ResourceExposure(ResourceScope.None)] [MethodImplAttribute(MethodImplOptions.InternalCall)] extern static bool IsAddressInStack(IntPtr ptr); #endif } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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