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// Copyright (c) .NET Foundation and contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
using System;
using ILLink.Shared.DataFlow;
using Microsoft.CodeAnalysis;
namespace ILLink.RoslynAnalyzer.DataFlow
{
public struct CapturedReferenceValue : IEquatable<CapturedReferenceValue>
{
public readonly IOperation? Reference;
public CapturedReferenceValue (IOperation operation)
{
switch (operation.Kind) {
case OperationKind.PropertyReference:
case OperationKind.LocalReference:
case OperationKind.FieldReference:
case OperationKind.ParameterReference:
case OperationKind.ArrayElementReference:
case OperationKind.ImplicitIndexerReference:
break;
case OperationKind.None:
case OperationKind.InstanceReference:
case OperationKind.Invocation:
case OperationKind.EventReference:
// These will just be ignored when referenced later.
break;
default:
throw new NotImplementedException (operation.Kind.ToString ());
}
Reference = operation;
}
public bool Equals (CapturedReferenceValue other) => Reference == other.Reference;
}
public struct CapturedReferenceLattice : ILattice<CapturedReferenceValue>
{
public CapturedReferenceValue Top => new CapturedReferenceValue ();
public CapturedReferenceValue Meet (CapturedReferenceValue left, CapturedReferenceValue right)
{
if (left.Equals (right))
return left;
if (left.Reference == null)
return right;
if (right.Reference == null)
return left;
// Both non-null and different shouldn't happen.
// We assume that a flow capture can capture only a single property.
throw new InvalidOperationException ();
}
}
}
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