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diff --git a/clang-r353983/include/lld/Core/Writer.h b/clang-r353983/include/lld/Core/Writer.h
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+//===- lld/Core/Writer.h - Abstract File Format Interface -----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLD_CORE_WRITER_H
+#define LLD_CORE_WRITER_H
+
+#include "lld/Common/LLVM.h"
+#include "llvm/Support/Error.h"
+#include <memory>
+#include <vector>
+
+namespace lld {
+class File;
+class LinkingContext;
+class MachOLinkingContext;
+
+/// The Writer is an abstract class for writing object files, shared
+/// library files, and executable files.  Each file format (e.g. mach-o, etc)
+/// has a concrete subclass of Writer.
+class Writer {
+public:
+  virtual ~Writer();
+
+  /// Write a file from the supplied File object
+  virtual llvm::Error writeFile(const File &linkedFile, StringRef path) = 0;
+
+  /// This method is called by Core Linking to give the Writer a chance
+  /// to add file format specific "files" to set of files to be linked. This is
+  /// how file format specific atoms can be added to the link.
+  virtual void createImplicitFiles(std::vector<std::unique_ptr<File>> &) {}
+
+protected:
+  // only concrete subclasses can be instantiated
+  Writer();
+};
+
+std::unique_ptr<Writer> createWriterMachO(const MachOLinkingContext &);
+std::unique_ptr<Writer> createWriterYAML(const LinkingContext &);
+} // end namespace lld
+
+#endif