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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.
#nullable disable
using System.Diagnostics;
using Microsoft.CodeAnalysis.CSharp.Symbols;
namespace Microsoft.CodeAnalysis.CSharp
{
internal sealed class LazyObsoleteDiagnosticInfo : LazyDiagnosticInfo
{
private readonly object _symbolOrSymbolWithAnnotations;
private readonly Symbol _containingSymbol;
private readonly BinderFlags _binderFlags;
internal LazyObsoleteDiagnosticInfo(object symbol, Symbol containingSymbol, BinderFlags binderFlags)
{
Debug.Assert(symbol is Symbol || symbol is TypeWithAnnotations);
_symbolOrSymbolWithAnnotations = symbol;
_containingSymbol = containingSymbol;
_binderFlags = binderFlags;
}
private LazyObsoleteDiagnosticInfo(LazyObsoleteDiagnosticInfo original, DiagnosticSeverity severity) : base(original, severity)
{
_symbolOrSymbolWithAnnotations = original._symbolOrSymbolWithAnnotations;
_containingSymbol = original._containingSymbol;
_binderFlags = original._binderFlags;
}
protected override DiagnosticInfo GetInstanceWithSeverityCore(DiagnosticSeverity severity)
{
return new LazyObsoleteDiagnosticInfo(this, severity);
}
protected override DiagnosticInfo ResolveInfo()
{
// A symbol's Obsoleteness may not have been calculated yet if the symbol is coming
// from a different compilation's source. In that case, force completion of attributes.
var symbol = (_symbolOrSymbolWithAnnotations as Symbol) ?? ((TypeWithAnnotations)_symbolOrSymbolWithAnnotations).Type;
symbol.ForceCompleteObsoleteAttribute();
var kind = ObsoleteAttributeHelpers.GetObsoleteDiagnosticKind(symbol, _containingSymbol, forceComplete: true);
Debug.Assert(kind != ObsoleteDiagnosticKind.Lazy);
Debug.Assert(kind != ObsoleteDiagnosticKind.LazyPotentiallySuppressed);
// If this symbol is not obsolete or is in an obsolete context, we don't want to report any diagnostics.
// Therefore return null.
return (kind == ObsoleteDiagnosticKind.Diagnostic) ?
ObsoleteAttributeHelpers.CreateObsoleteDiagnostic(symbol, _binderFlags) :
null;
}
}
}
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