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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.
using System;
using System.Diagnostics;
using Internal.TypeSystem;
namespace Internal.JitInterface
{
/// <summary>
/// Represents the unboxing entrypoint of a valuetype instance method.
/// This class is for internal purposes within the JitInterface. It's not expected
/// for it to escape the JitInterface.
/// </summary>
internal sealed class UnboxingMethodDesc : MethodDelegator
{
private readonly UnboxingMethodDescFactory _factory;
public MethodDesc Target => _wrappedMethod;
public UnboxingMethodDesc(MethodDesc wrappedMethod, UnboxingMethodDescFactory factory)
: base(wrappedMethod)
{
Debug.Assert(wrappedMethod.OwningType.IsValueType);
Debug.Assert(!wrappedMethod.Signature.IsStatic);
_factory = factory;
}
public override MethodDesc GetCanonMethodTarget(CanonicalFormKind kind)
{
MethodDesc realCanonTarget = _wrappedMethod.GetCanonMethodTarget(kind);
if (realCanonTarget != _wrappedMethod)
return _factory.GetUnboxingMethod(realCanonTarget);
return this;
}
public override MethodDesc GetMethodDefinition()
{
MethodDesc realMethodDefinition = _wrappedMethod.GetMethodDefinition();
if (realMethodDefinition != _wrappedMethod)
return _factory.GetUnboxingMethod(realMethodDefinition);
return this;
}
public override MethodDesc GetTypicalMethodDefinition()
{
MethodDesc realTypicalMethodDefinition = _wrappedMethod.GetTypicalMethodDefinition();
if (realTypicalMethodDefinition != _wrappedMethod)
return _factory.GetUnboxingMethod(realTypicalMethodDefinition);
return this;
}
public override MethodDesc InstantiateSignature(Instantiation typeInstantiation, Instantiation methodInstantiation)
{
MethodDesc realInstantiateSignature = _wrappedMethod.InstantiateSignature(typeInstantiation, methodInstantiation);
if (realInstantiateSignature != _wrappedMethod)
return _factory.GetUnboxingMethod(realInstantiateSignature);
return this;
}
public override string ToString()
{
return "Unboxing MethodDesc: " + _wrappedMethod.ToString();
}
#if !SUPPORT_JIT
protected override int ClassCode => throw new NotImplementedException();
protected override int CompareToImpl(MethodDesc other, TypeSystemComparer comparer)
{
throw new NotImplementedException();
}
#endif
}
internal static class UnboxingMethodDescExtensions
{
public static bool IsUnboxingThunk(this MethodDesc method)
{
return method is UnboxingMethodDesc;
}
public static MethodDesc GetUnboxedMethod(this MethodDesc method)
{
return ((UnboxingMethodDesc)method).Target;
}
}
}
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