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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.
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Options;
using Microsoft.CodeAnalysis.SolutionCrawler;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.Diagnostics;
internal sealed partial class DiagnosticAnalyzerService
{
private sealed partial class DocumentAnalysisExecutor
{
private const string AnalyzerExceptionDiagnosticCategory = "Intellisense";
/// <summary>
/// Create a diagnostic for exception thrown by the given analyzer.
/// </summary>
/// <remarks>
/// Keep this method in sync with "AnalyzerExecutor.CreateAnalyzerExceptionDiagnostic".
/// </remarks>
internal static Diagnostic CreateAnalyzerExceptionDiagnostic(DiagnosticAnalyzer analyzer, Exception e)
{
var analyzerName = analyzer.ToString();
// TODO: It is not ideal to create a new descriptor per analyzer exception diagnostic instance.
// However, until we add a LongMessage field to the Diagnostic, we are forced to park the instance specific description onto the Descriptor's Description field.
// This requires us to create a new DiagnosticDescriptor instance per diagnostic instance.
var descriptor = new DiagnosticDescriptor(AnalyzerExceptionDiagnosticId,
title: FeaturesResources.User_Diagnostic_Analyzer_Failure,
messageFormat: FeaturesResources.Analyzer_0_threw_an_exception_of_type_1_with_message_2,
description: string.Format(FeaturesResources.Analyzer_0_threw_the_following_exception_colon_1, analyzerName, e.CreateDiagnosticDescription()),
category: AnalyzerExceptionDiagnosticCategory,
defaultSeverity: DiagnosticSeverity.Warning,
isEnabledByDefault: true,
customTags: WellKnownDiagnosticTags.AnalyzerException);
return Diagnostic.Create(descriptor, Location.None, analyzerName, e.GetType(), e.Message);
}
/// <summary>
/// Return true if the given <paramref name="analyzer"/> is not suppressed for the given project.
/// NOTE: This API is intended to be used only for performance optimization.
/// </summary>
public static bool IsAnalyzerEnabledForProject(DiagnosticAnalyzer analyzer, Project project, IGlobalOptionService globalOptions)
{
var options = project.CompilationOptions;
if (options == null || analyzer == FileContentLoadAnalyzer.Instance || analyzer == GeneratorDiagnosticsPlaceholderAnalyzer.Instance)
{
return true;
}
if (analyzer.IsCompilerAnalyzer())
{
return globalOptions.GetBackgroundCompilerAnalysisScope(project.Language) != CompilerDiagnosticsScope.None;
}
// Check if user has disabled analyzer execution for this project or via options.
if (!project.State.RunAnalyzers || globalOptions.GetBackgroundAnalysisScope(project.Language) == BackgroundAnalysisScope.None)
{
return false;
}
// NOTE: Previously we used to return "CompilationWithAnalyzers.IsDiagnosticAnalyzerSuppressed(options)"
// on this code path, which returns true if analyzer is suppressed through compilation options.
// However, this check is no longer correct as analyzers can be enabled/disabled for individual
// documents through .editorconfig files. So we pessimistically assume analyzer is not suppressed
// and let the core analyzer driver in the compiler layer handle skipping redundant analysis callbacks.
return true;
}
public static async Task<ImmutableArray<Diagnostic>> ComputeDocumentDiagnosticAnalyzerDiagnosticsAsync(
DocumentDiagnosticAnalyzer analyzer,
TextDocument document,
AnalysisKind kind,
Compilation? compilation,
SyntaxTree? tree,
CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
ImmutableArray<Diagnostic> diagnostics;
try
{
diagnostics = kind switch
{
AnalysisKind.Syntax => await analyzer.AnalyzeSyntaxAsync(document, tree, cancellationToken).ConfigureAwait(false),
AnalysisKind.Semantic => await analyzer.AnalyzeSemanticsAsync(document, tree, cancellationToken).ConfigureAwait(false),
_ => throw ExceptionUtilities.UnexpectedValue(kind),
};
diagnostics = diagnostics.NullToEmpty();
#if DEBUG
// since all DocumentDiagnosticAnalyzers are from internal users, we only do debug check. also this can be expensive at runtime
// since it requires await. if we find any offender through NFW, we should be able to fix those since all those should
// from intern teams.
await VerifyDiagnosticLocationsAsync(diagnostics, document.Project, cancellationToken).ConfigureAwait(false);
#endif
}
catch (Exception e) when (!IsCanceled(e, cancellationToken))
{
diagnostics = [CreateAnalyzerExceptionDiagnostic(analyzer, e)];
}
if (compilation != null)
{
diagnostics = CompilationWithAnalyzers.GetEffectiveDiagnostics(diagnostics, compilation).ToImmutableArrayOrEmpty();
}
return diagnostics;
}
private static bool IsCanceled(Exception ex, CancellationToken cancellationToken)
=> (ex as OperationCanceledException)?.CancellationToken == cancellationToken;
#if DEBUG
private static async Task VerifyDiagnosticLocationsAsync(ImmutableArray<Diagnostic> diagnostics, Project project, CancellationToken cancellationToken)
{
foreach (var diagnostic in diagnostics)
{
await VerifyDiagnosticLocationAsync(diagnostic.Id, diagnostic.Location).ConfigureAwait(false);
if (diagnostic.AdditionalLocations != null)
{
foreach (var location in diagnostic.AdditionalLocations)
{
await VerifyDiagnosticLocationAsync(diagnostic.Id, location).ConfigureAwait(false);
}
}
}
async Task VerifyDiagnosticLocationAsync(string id, Location location)
{
switch (location.Kind)
{
case LocationKind.None:
case LocationKind.MetadataFile:
case LocationKind.XmlFile:
// ignore these kinds
break;
case LocationKind.SourceFile:
{
RoslynDebug.Assert(location.SourceTree != null);
if (project.GetDocument(location.SourceTree) == null)
{
// Disallow diagnostics with source locations outside this project.
throw new ArgumentException(string.Format(FeaturesResources.Reported_diagnostic_0_has_a_source_location_in_file_1_which_is_not_part_of_the_compilation_being_analyzed, id, location.SourceTree.FilePath), "diagnostic");
}
if (location.SourceSpan.End > location.SourceTree.Length)
{
// Disallow diagnostics with source locations outside this project.
throw new ArgumentException(string.Format(FeaturesResources.Reported_diagnostic_0_has_a_source_location_1_in_file_2_which_is_outside_of_the_given_file, id, location.SourceSpan, location.SourceTree.FilePath), "diagnostic");
}
}
break;
case LocationKind.ExternalFile:
{
var filePath = location.GetLineSpan().Path;
var document = TryGetDocumentWithFilePath(filePath);
if (document == null)
{
// this is not a roslyn file. we don't care about this file.
return;
}
// this can be potentially expensive since it will load text if it is not already loaded.
// but, this text is most likely already loaded since producer of this diagnostic (Document/ProjectDiagnosticAnalyzers)
// should have loaded it to produce the diagnostic at the first place. once loaded, it should stay in memory until
// project cache goes away. when text is already there, await should return right away.
var text = await document.GetValueTextAsync(cancellationToken).ConfigureAwait(false);
if (location.SourceSpan.End > text.Length)
{
// Disallow diagnostics with locations outside this project.
throw new ArgumentException(string.Format(FeaturesResources.Reported_diagnostic_0_has_a_source_location_1_in_file_2_which_is_outside_of_the_given_file, id, location.SourceSpan, filePath), "diagnostic");
}
}
break;
default:
throw ExceptionUtilities.Unreachable();
}
}
Document? TryGetDocumentWithFilePath(string path)
{
foreach (var documentId in project.Solution.GetDocumentIdsWithFilePath(path))
{
if (documentId.ProjectId == project.Id)
{
return project.GetDocument(documentId);
}
}
return null;
}
}
#endif
#if DEBUG
internal static bool AreEquivalent(Diagnostic[] diagnosticsA, Diagnostic[] diagnosticsB)
{
var set = new HashSet<Diagnostic>(diagnosticsA, DiagnosticComparer.Instance);
return set.SetEquals(diagnosticsB);
}
private sealed class DiagnosticComparer : IEqualityComparer<Diagnostic?>
{
internal static readonly DiagnosticComparer Instance = new();
public bool Equals(Diagnostic? x, Diagnostic? y)
{
if (x is null)
return y is null;
else if (y is null)
return false;
return x.Id == y.Id && x.Location == y.Location;
}
public int GetHashCode(Diagnostic? obj)
{
if (obj is null)
return 0;
return Hash.Combine(obj.Id.GetHashCode(), obj.Location.GetHashCode());
}
}
#endif
}
}
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