Snapshots: more logging, fix memory leak

internal/lsp/server.go

@@ -445,6 +445,7 @@ var handlers = sync.OnceValue(func() handlerMap {
 	registerNotificationHandler(handlers, lsproto.TextDocumentDidSaveInfo, (*Server).handleDidSave)
 	registerNotificationHandler(handlers, lsproto.TextDocumentDidCloseInfo, (*Server).handleDidClose)
 	registerNotificationHandler(handlers, lsproto.WorkspaceDidChangeWatchedFilesInfo, (*Server).handleDidChangeWatchedFiles)
+	registerNotificationHandler(handlers, lsproto.SetTraceInfo, (*Server).handleSetTrace)
 
 	registerLanguageServiceDocumentRequestHandler(handlers, lsproto.TextDocumentDiagnosticInfo, (*Server).handleDocumentDiagnostic)
 	registerLanguageServiceDocumentRequestHandler(handlers, lsproto.TextDocumentHoverInfo, (*Server).handleHover)
@@ -557,6 +558,10 @@ func (s *Server) handleInitialize(ctx context.Context, params *lsproto.Initializ
 		s.locale = locale
 	}
 
+	if s.initializeParams.Trace != nil && *s.initializeParams.Trace == "verbose" {
+		s.logger.SetVerbose(true)
+	}
+
 	response := &lsproto.InitializeResult{
 		ServerInfo: &lsproto.ServerInfo{
 			Name:    "typescript-go",
@@ -686,6 +691,21 @@ func (s *Server) handleDidChangeWatchedFiles(ctx context.Context, params *lsprot
 	return nil
 }
 
+func (s *Server) handleSetTrace(ctx context.Context, params *lsproto.SetTraceParams) error {
+	switch params.Value {
+	case "verbose":
+		s.logger.SetVerbose(true)
+	case "messages":
+		s.logger.SetVerbose(false)
+	case "off":
+		// !!! logging cannot be completely turned off for now
+		s.logger.SetVerbose(false)
+	default:
+		return fmt.Errorf("unknown trace value: %s", params.Value)
+	}
+	return nil
+}
+
 func (s *Server) handleDocumentDiagnostic(ctx context.Context, ls *ls.LanguageService, params *lsproto.DocumentDiagnosticParams) (lsproto.DocumentDiagnosticResponse, error) {
 	return ls.ProvideDiagnostics(ctx, params.TextDocument.Uri)
 }

internal/project/ata/ata_test.go

@@ -382,6 +382,8 @@ func TestATA(t *testing.T) {
 			Type: lsproto.FileChangeTypeChanged,
 			Uri:  lsproto.DocumentUri("file:///user/username/projects/project/package.json"),
 		}})
+		// diagnostics refresh triggered - simulate by getting the language service
+		_, _ = session.GetLanguageService(context.Background(), uri)
 		session.WaitForBackgroundTasks()
 
 		calls = utils.NpmExecutor().NpmInstallCalls()

internal/project/compilerhost.go

@@ -4,6 +4,7 @@ import (
 	"time"
 
 	"github.com/microsoft/typescript-go/internal/ast"
+	"github.com/microsoft/typescript-go/internal/collections"
 	"github.com/microsoft/typescript-go/internal/compiler"
 	"github.com/microsoft/typescript-go/internal/ls"
 	"github.com/microsoft/typescript-go/internal/project/logging"
@@ -22,24 +23,49 @@ type compilerHost struct {
 	fs                 *snapshotFSBuilder
 	compilerFS         *compilerFS
 	configFileRegistry *ConfigFileRegistry
+	seenFiles          *collections.SyncSet[tspath.Path]
 
 	project *Project
 	builder *projectCollectionBuilder
 	logger  *logging.LogTree
 }
 
+type builderFileSource struct {
+	seenFiles         *collections.SyncSet[tspath.Path]
+	snapshotFSBuilder *snapshotFSBuilder
+}
+
+func (c *builderFileSource) GetFile(fileName string) FileHandle {
+	path := c.snapshotFSBuilder.toPath(fileName)
+	c.seenFiles.Add(path)
+	return c.snapshotFSBuilder.GetFileByPath(fileName, path)
+}
+
+func (c *builderFileSource) FS() vfs.FS {
+	return c.snapshotFSBuilder.FS()
+}
+
 func newCompilerHost(
 	currentDirectory string,
 	project *Project,
 	builder *projectCollectionBuilder,
 	logger *logging.LogTree,
 ) *compilerHost {
+	seenFiles := &collections.SyncSet[tspath.Path]{}
+	compilerFS := &compilerFS{
+		source: &builderFileSource{
+			seenFiles:         seenFiles,
+			snapshotFSBuilder: builder.fs,
+		},
+	}
+
 	return &compilerHost{
 		configFilePath:   project.configFilePath,
 		currentDirectory: currentDirectory,
 		sessionOptions:   builder.sessionOptions,
 
-		compilerFS: &compilerFS{source: builder.fs},
+		compilerFS: compilerFS,
+		seenFiles:  seenFiles,
 
 		fs:      builder.fs,
 		project: project,
@@ -88,6 +114,7 @@ func (c *compilerHost) GetResolvedProjectReference(fileName string, path tspath.
 	if c.builder == nil {
 		return c.configFileRegistry.GetConfig(path)
 	} else {
+		c.seenFiles.Add(path)
 		return c.builder.configFileRegistryBuilder.acquireConfigForProject(fileName, path, c.project, c.logger)
 	}
 }
@@ -97,6 +124,7 @@ func (c *compilerHost) GetResolvedProjectReference(fileName string, path tspath.
 // be a corresponding release for each call made.
 func (c *compilerHost) GetSourceFile(opts ast.SourceFileParseOptions) *ast.SourceFile {
 	c.ensureAlive()
+	c.seenFiles.Add(opts.Path)
 	if fh := c.fs.GetFileByPath(opts.FileName, opts.Path); fh != nil {
 		return c.builder.parseCache.Acquire(fh, opts, fh.Kind())
 	}

internal/project/filechange.go

@@ -38,8 +38,6 @@ type FileChangeSummary struct {
 	Created collections.Set[lsproto.DocumentUri]
 	// Only set when file watching is enabled
 	Deleted collections.Set[lsproto.DocumentUri]
-
-	IncludesWatchChangesOnly bool
 }
 
 func (f FileChangeSummary) IsEmpty() bool {

internal/project/overlayfs.go

@@ -197,7 +197,6 @@ func (fs *overlayFS) processChanges(changes []FileChange) (FileChangeSummary, ma
 	fs.mu.Lock()
 	defer fs.mu.Unlock()
 
-	var includesNonWatchChange bool
 	var result FileChangeSummary
 	newOverlays := maps.Clone(fs.overlays)
 
@@ -283,7 +282,6 @@ func (fs *overlayFS) processChanges(changes []FileChange) (FileChangeSummary, ma
 			if result.Opened != "" {
 				panic("can only process one file open event at a time")
 			}
-			includesNonWatchChange = true
 			result.Opened = uri
 			newOverlays[path] = newOverlay(
 				uri.FileName(),
@@ -295,7 +293,6 @@ func (fs *overlayFS) processChanges(changes []FileChange) (FileChangeSummary, ma
 		}
 
 		if events.closeChange != nil {
-			includesNonWatchChange = true
 			if result.Closed == nil {
 				result.Closed = make(map[lsproto.DocumentUri]xxh3.Uint128)
 			}
@@ -316,7 +313,6 @@ func (fs *overlayFS) processChanges(changes []FileChange) (FileChangeSummary, ma
 		}
 
 		if len(events.changes) > 0 {
-			includesNonWatchChange = true
 			result.Changed.Add(uri)
 			if o == nil {
 				panic("overlay not found for changed file: " + uri)
@@ -361,6 +357,5 @@ func (fs *overlayFS) processChanges(changes []FileChange) (FileChangeSummary, ma
 	}
 
 	fs.overlays = newOverlays
-	result.IncludesWatchChangesOnly = !includesNonWatchChange
 	return result, newOverlays
 }

internal/project/projectcollectionbuilder.go

@@ -772,12 +772,16 @@ func (b *projectCollectionBuilder) updateProgram(entry dirty.Value[*Project], lo
 		}
 		if updateProgram {
 			entry.Change(func(project *Project) {
+				oldHost := project.host
 				project.host = newCompilerHost(project.currentDirectory, project, b, logger.Fork("CompilerHost"))
 				result := project.CreateProgram()
 				project.Program = result.Program
 				project.checkerPool = result.CheckerPool
 				project.ProgramUpdateKind = result.UpdateKind
 				project.ProgramLastUpdate = b.newSnapshotID
+				if result.UpdateKind == ProgramUpdateKindCloned {
+					project.host.seenFiles = oldHost.seenFiles
+				}
 				if result.UpdateKind == ProgramUpdateKindNewFiles {
 					filesChanged = true
 					if b.sessionOptions.WatchEnabled {