1 files changed, 42 insertions, 0 deletions
diff --git a/gopls/internal/lsp/call_hierarchy.go b/gopls/internal/lsp/call_hierarchy.go
new file mode 100644
index 000000000..79eeb25cc
--- /dev/null
+++ b/gopls/internal/lsp/call_hierarchy.go
@@ -0,0 +1,42 @@
+// 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/gopls/internal/lsp/protocol"
+	"golang.org/x/tools/gopls/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)
+}