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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.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Linq;
using System.Runtime.Serialization;
using Microsoft.CodeAnalysis.Contracts.EditAndContinue;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.PooledObjects;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.EditAndContinue;
internal readonly struct EmitSolutionUpdateResults
{
[DataContract]
internal readonly struct Data
{
[DataMember]
public required ModuleUpdates ModuleUpdates { get; init; }
[DataMember]
public required ImmutableArray<DiagnosticData> Diagnostics { get; init; }
[DataMember]
public required DiagnosticData? SyntaxError { get; init; }
[DataMember]
public required ImmutableDictionary<ProjectId, ImmutableArray<ProjectId>> ProjectsToRestart { get; init; }
[DataMember]
public required ImmutableArray<ProjectId> ProjectsToRebuild { get; init; }
internal ImmutableArray<ManagedHotReloadDiagnostic> GetAllDiagnostics()
{
using var _ = ArrayBuilder<ManagedHotReloadDiagnostic>.GetInstance(out var builder);
foreach (var diagnostic in Diagnostics)
{
var severity = diagnostic.Severity switch
{
DiagnosticSeverity.Error => EditAndContinueDiagnosticDescriptors.IsEncDiagnostic(diagnostic.Id) ? ManagedHotReloadDiagnosticSeverity.RestartRequired : ManagedHotReloadDiagnosticSeverity.Error,
DiagnosticSeverity.Warning => ManagedHotReloadDiagnosticSeverity.Warning,
_ => default
};
if (severity != default)
{
builder.Add(diagnostic.ToHotReloadDiagnostic(severity));
}
}
if (SyntaxError != null)
{
Debug.Assert(SyntaxError.DataLocation != null);
Debug.Assert(SyntaxError.Message != null);
var fileSpan = SyntaxError.DataLocation.MappedFileSpan;
builder.Add(new ManagedHotReloadDiagnostic(
SyntaxError.Id,
SyntaxError.Message,
ManagedHotReloadDiagnosticSeverity.Error,
fileSpan.Path,
fileSpan.Span.ToSourceSpan()));
}
return builder.ToImmutableAndClear();
}
public static Data CreateFromInternalError(Solution solution, string errorMessage, ImmutableDictionary<ProjectId, RunningProjectInfo> runningProjects)
{
ImmutableArray<DiagnosticData> diagnostics = [];
var firstProject = solution.GetProject(runningProjects.FirstOrDefault().Key) ?? solution.Projects.First();
var descriptor = EditAndContinueDiagnosticDescriptors.GetDescriptor(EditAndContinueErrorCode.CannotApplyChangesUnexpectedError);
var diagnostic = Diagnostic.Create(
descriptor,
Location.None,
string.Format(descriptor.MessageFormat.ToString(), "", errorMessage));
return new()
{
ModuleUpdates = new ModuleUpdates(ModuleUpdateStatus.Ready, []),
Diagnostics = [DiagnosticData.Create(diagnostic, firstProject)],
SyntaxError = null,
ProjectsToRebuild = [.. runningProjects.Keys],
ProjectsToRestart = runningProjects.Keys.ToImmutableDictionary(keySelector: static p => p, elementSelector: static p => ImmutableArray.Create(p))
};
}
}
public static readonly EmitSolutionUpdateResults Empty = new()
{
Solution = null,
ModuleUpdates = new ModuleUpdates(ModuleUpdateStatus.None, []),
Diagnostics = [],
SyntaxError = null,
ProjectsToRestart = ImmutableDictionary<ProjectId, ImmutableArray<ProjectId>>.Empty,
ProjectsToRebuild = [],
};
/// <summary>
/// Solution snapshot to resolve diagnostics in.
/// Note that this might be a different snapshot from the one passed to EmitSolutionUpdateAsync,
/// with source generator files refreshed.
///
/// Null only for empty results.
/// </summary>
public required Solution? Solution { get; init; }
public required ModuleUpdates ModuleUpdates { get; init; }
/// <summary>
/// Reported diagnostics per project.
/// At most one set of diagnostics per project.
/// </summary>
public required ImmutableArray<ProjectDiagnostics> Diagnostics { get; init; }
public required Diagnostic? SyntaxError { get; init; }
/// <summary>
/// Running projects that have to be restarted and a list of projects with rude edits that caused the restart.
/// </summary>
public required ImmutableDictionary<ProjectId, ImmutableArray<ProjectId>> ProjectsToRestart { get; init; }
/// <summary>
/// Projects whose source have been updated and need to be rebuilt. Does not include projects without change that depend on such projects.
/// It is assumed that the host automatically rebuilds all such projects that need rebuilding because it detects the dependent project outputs have been updated.
/// Unordered set.
/// </summary>
public required ImmutableArray<ProjectId> ProjectsToRebuild { get; init; }
public Data Dehydrate()
=> Solution == null
? new()
{
ModuleUpdates = ModuleUpdates,
Diagnostics = [],
SyntaxError = null,
ProjectsToRestart = ImmutableDictionary<ProjectId, ImmutableArray<ProjectId>>.Empty,
ProjectsToRebuild = [],
}
: new()
{
ModuleUpdates = ModuleUpdates,
Diagnostics = Diagnostics.ToDiagnosticData(Solution),
SyntaxError = GetSyntaxErrorData(),
ProjectsToRestart = ProjectsToRestart,
ProjectsToRebuild = ProjectsToRebuild,
};
private DiagnosticData? GetSyntaxErrorData()
{
if (SyntaxError == null)
{
return null;
}
Debug.Assert(Solution != null);
Debug.Assert(SyntaxError.Location.SourceTree != null);
return DiagnosticData.Create(SyntaxError, Solution.GetRequiredDocument(SyntaxError.Location.SourceTree));
}
/// <summary>
/// Returns projects that need to be rebuilt and/or restarted due to blocking rude edits in order to apply changes.
/// </summary>
/// <param name="runningProjects">Identifies projects that have been launched.</param>
/// <param name="projectsToRestart">
/// Running projects that have to be restarted and a list of projects with rude edits that caused the restart.
/// </param>
/// <param name="projectsToRebuild">
/// Projects whose source have been updated and need to be rebuilt. Does not include projects without change that depend on such projects.
/// It is assumed that the host automatically rebuilds all such projects that need rebuilding because it detects the dependent project outputs have been updated.
/// Unordered set.
/// </param>
internal static void GetProjectsToRebuildAndRestart(
Solution solution,
ImmutableArray<ManagedHotReloadUpdate> moduleUpdates,
ImmutableArray<ProjectDiagnostics> diagnostics,
ImmutableDictionary<ProjectId, RunningProjectInfo> runningProjects,
out ImmutableDictionary<ProjectId, ImmutableArray<ProjectId>> projectsToRestart,
out ImmutableArray<ProjectId> projectsToRebuild)
{
Debug.Assert(!diagnostics.HasDuplicates(d => d.ProjectId));
Debug.Assert(diagnostics.Select(re => re.ProjectId).IsSorted());
// Projects with errors (including blocking rude edits) should not have updates:
Debug.Assert(diagnostics
.Where(r => r.Diagnostics.Any(static d => d.Severity == DiagnosticSeverity.Error))
.Select(r => r.ProjectId)
.Intersect(moduleUpdates.Select(u => u.ProjectId))
.IsEmpty());
var graph = solution.GetProjectDependencyGraph();
// First, find all running projects that transitively depend on projects with blocking rude edits
// or edits that have no effect until restart. Note that the latter only trigger restart
// of projects that are configured to restart on no-effect change.
//
// These will need to be rebuilt and restarted. In order to rebuilt these projects
// all their transitive references must either be free of source changes [*] or be rebuilt as well.
// This may add more running projects to the set of projects we need to restart.
// We need to repeat this process until we find a fixed point.
//
// [*] If a running project depended on a project with changes and was not restarted,
// the debugger might stop at the changed method body and its current source code
// wouldn't match the IL being executed.
using var _1 = ArrayBuilder<ProjectId>.GetInstance(out var traversalStack);
// Maps project to restart to all projects with rude edits that caused the restart:
var projectsToRestartBuilder = PooledDictionary<ProjectId, ArrayBuilder<ProjectId>>.GetInstance();
using var _3 = PooledHashSet<ProjectId>.GetInstance(out var projectsToRebuildBuilder);
using var _4 = ArrayBuilder<(ProjectId projectWithRudeEdits, ImmutableArray<ProjectId> impactedRunningProjects)>.GetInstance(out var impactedRunningProjectMap);
using var _5 = ArrayBuilder<ProjectId>.GetInstance(out var impactedRunningProjects);
foreach (var (projectId, projectDiagnostics) in diagnostics)
{
ClassifyRudeEdits(projectDiagnostics, out var hasBlocking, out var hasNoEffect);
if (!hasBlocking && !hasNoEffect)
{
continue;
}
AddImpactedRunningProjects(impactedRunningProjects, projectId, hasBlocking);
foreach (var impactedRunningProject in impactedRunningProjects)
{
projectsToRestartBuilder.MultiAdd(impactedRunningProject, projectId);
}
if (hasBlocking && impactedRunningProjects is [])
{
// Projects with rude edits that do not impact running projects has to be rebuilt,
// so that the change takes effect if it is loaded in future.
projectsToRebuildBuilder.Add(projectId);
}
impactedRunningProjects.Clear();
}
// At this point the restart set contains all running projects transitively affected by rude edits.
// Next, find projects that were successfully updated and affect running projects.
// Remove once https://github.com/dotnet/roslyn/issues/78244 is implemented.
if (!runningProjects.Any(static p => p.Value.AllowPartialUpdate))
{
// Partial solution update not supported.
if (projectsToRestartBuilder.Any())
{
foreach (var update in moduleUpdates)
{
AddImpactedRunningProjects(impactedRunningProjects, update.ProjectId, isBlocking: true);
foreach (var impactedRunningProject in impactedRunningProjects)
{
projectsToRestartBuilder.TryAdd(impactedRunningProject, []);
}
impactedRunningProjects.Clear();
}
}
}
else if (!moduleUpdates.IsEmpty && projectsToRestartBuilder.Count > 0)
{
// The set of updated projects is usually much smaller than the number of all projects in the solution.
// We iterate over this set updating the reset set until no new project is added to the reset set.
// Once a project is determined to affect a running process, all running processes that
// reference this project are added to the reset set. The project is then removed from updated
// project set as it can't contribute any more running projects to the reset set.
// If an updated project does not affect reset set in a given iteration, it stays in the set
// because it may affect reset set later on, after another running project is added to it.
using var _6 = PooledHashSet<ProjectId>.GetInstance(out var updatedProjects);
using var _7 = ArrayBuilder<ProjectId>.GetInstance(out var updatedProjectsToRemove);
using var _8 = PooledHashSet<ProjectId>.GetInstance(out var projectsThatCausedRestart);
updatedProjects.AddRange(moduleUpdates.Select(static u => u.ProjectId));
while (true)
{
Debug.Assert(updatedProjectsToRemove.IsEmpty);
foreach (var updatedProjectId in updatedProjects)
{
AddImpactedRunningProjects(impactedRunningProjects, updatedProjectId, isBlocking: true);
Debug.Assert(projectsThatCausedRestart.Count == 0);
// collect all projects that caused restart of any of the impacted running projects:
foreach (var impactedRunningProject in impactedRunningProjects)
{
if (projectsToRestartBuilder.TryGetValue(impactedRunningProject, out var causes))
{
projectsThatCausedRestart.AddRange(causes);
}
}
if (projectsThatCausedRestart.Any())
{
// The projects that caused the impacted running project to be restarted
// indirectly cause the running project that depends on the updated project to be restarted.
foreach (var impactedRunningProject in impactedRunningProjects)
{
if (!projectsToRestartBuilder.ContainsKey(impactedRunningProject))
{
projectsToRestartBuilder.MultiAddRange(impactedRunningProject, projectsThatCausedRestart);
}
}
updatedProjectsToRemove.Add(updatedProjectId);
}
impactedRunningProjects.Clear();
projectsThatCausedRestart.Clear();
}
if (updatedProjectsToRemove is [])
{
// none of the remaining updated projects affect restart set:
break;
}
updatedProjects.RemoveAll(updatedProjectsToRemove);
updatedProjectsToRemove.Clear();
}
}
foreach (var (_, causes) in projectsToRestartBuilder)
{
causes.SortAndRemoveDuplicates();
}
projectsToRebuildBuilder.AddRange(projectsToRestartBuilder.Keys);
projectsToRestart = projectsToRestartBuilder.ToImmutableMultiDictionaryAndFree();
projectsToRebuild = [.. projectsToRebuildBuilder];
return;
void AddImpactedRunningProjects(ArrayBuilder<ProjectId> impactedProjects, ProjectId initialProject, bool isBlocking)
{
Debug.Assert(impactedProjects.IsEmpty);
Debug.Assert(traversalStack.Count == 0);
traversalStack.Push(initialProject);
while (traversalStack.Count > 0)
{
var projectId = traversalStack.Pop();
if (runningProjects.TryGetValue(projectId, out var runningProject) &&
(isBlocking || runningProject.RestartWhenChangesHaveNoEffect))
{
impactedProjects.Add(projectId);
}
foreach (var referencingProjectId in graph.GetProjectsThatDirectlyDependOnThisProject(projectId))
{
traversalStack.Push(referencingProjectId);
}
}
}
}
private static void ClassifyRudeEdits(ImmutableArray<Diagnostic> diagnostics, out bool blocking, out bool noEffect)
{
noEffect = false;
blocking = false;
foreach (var diagnostic in diagnostics)
{
noEffect |= diagnostic.IsNoEffectDiagnostic();
blocking |= diagnostic.IsEncDiagnostic() && diagnostic.Severity == DiagnosticSeverity.Error;
if (noEffect && blocking)
{
return;
}
}
}
public ImmutableArray<Diagnostic> GetAllDiagnostics()
{
using var _ = ArrayBuilder<Diagnostic>.GetInstance(out var result);
foreach (var (_, projectEmitDiagnostics) in Diagnostics)
{
result.AddRange(projectEmitDiagnostics);
}
if (SyntaxError != null)
{
result.Add(SyntaxError);
}
return result.ToImmutableAndClear();
}
/// <summary>
/// Returns all diagnostics that can be addressed by rebuilding/restarting the project.
/// </summary>
public ImmutableArray<(ProjectId projectId, ImmutableArray<Diagnostic> diagnostics)> GetTransientDiagnostics()
{
using var _ = ArrayBuilder<(ProjectId projectId, ImmutableArray<Diagnostic> diagnostics)>.GetInstance(out var result);
foreach (var (projectId, diagnostics) in Diagnostics)
{
var transientDiagnostics = diagnostics.WhereAsArray(static d => d.IsEncDiagnostic());
if (transientDiagnostics.Length > 0)
{
result.Add((projectId, transientDiagnostics));
}
}
return result.ToImmutable();
}
/// <summary>
/// Returns all diagnostics that can't be addressed by rebuilding/restarting the project.
/// </summary>
public ImmutableArray<Diagnostic> GetPersistentDiagnostics()
{
using var _ = ArrayBuilder<Diagnostic>.GetInstance(out var result);
foreach (var (_, diagnostics) in Diagnostics)
{
foreach (var diagnostic in diagnostics)
{
if (!diagnostic.IsEncDiagnostic())
{
result.Add(diagnostic);
}
}
}
if (SyntaxError != null)
{
result.Add(SyntaxError);
}
return result.ToImmutableAndClear();
}
}
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