--- /dev/null
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package lsp
+
+import (
+ "context"
+
+ "golang.org/x/tools/internal/lsp/protocol"
+ "golang.org/x/tools/internal/lsp/source"
+)
+
+func (s *Server) prepareCallHierarchy(ctx context.Context, params *protocol.CallHierarchyPrepareParams) ([]protocol.CallHierarchyItem, error) {
+ snapshot, fh, ok, release, err := s.beginFileRequest(ctx, params.TextDocument.URI, source.Go)
+ defer release()
+ if !ok {
+ return nil, err
+ }
+
+ return source.PrepareCallHierarchy(ctx, snapshot, fh, params.Position)
+}
+
+func (s *Server) incomingCalls(ctx context.Context, params *protocol.CallHierarchyIncomingCallsParams) ([]protocol.CallHierarchyIncomingCall, error) {
+ snapshot, fh, ok, release, err := s.beginFileRequest(ctx, params.Item.URI, source.Go)
+ defer release()
+ if !ok {
+ return nil, err
+ }
+
+ return source.IncomingCalls(ctx, snapshot, fh, params.Item.Range.Start)
+}
+
+func (s *Server) outgoingCalls(ctx context.Context, params *protocol.CallHierarchyOutgoingCallsParams) ([]protocol.CallHierarchyOutgoingCall, error) {
+ snapshot, fh, ok, release, err := s.beginFileRequest(ctx, params.Item.URI, source.Go)
+ defer release()
+ if !ok {
+ return nil, err
+ }
+
+ return source.OutgoingCalls(ctx, snapshot, fh, params.Item.Range.Start)
+}