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diff --git a/include/lld/Core/Writer.h b/include/lld/Core/Writer.h
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+++ b/include/lld/Core/Writer.h
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+//===- lld/Core/Writer.h - Abstract File Format Interface -----------------===//
+//
+//                             The LLVM Linker
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLD_CORE_WRITER_H
+#define LLD_CORE_WRITER_H
+
+#include "lld/Core/LLVM.h"
+#include <memory>
+#include <vector>
+
+namespace lld {
+class File;
+class ELFLinkingContext;
+class MachOLinkingContext;
+class PECOFFLinkingContext;
+class LinkingContext;
+class TargetHandlerBase;
+
+/// \brief The Writer is an abstract class for writing object files, shared
+/// library files, and executable files.  Each file format (e.g. ELF, mach-o,
+/// PECOFF, native, etc) have a concrete subclass of Writer.
+class Writer {
+public:
+  virtual ~Writer();
+
+  /// \brief Write a file from the supplied File object
+  virtual std::error_code writeFile(const File &linkedFile, StringRef path) = 0;
+
+  /// \brief 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 bool createImplicitFiles(std::vector<std::unique_ptr<File> > &);
+
+protected:
+  // only concrete subclasses can be instantiated
+  Writer();
+};
+
+std::unique_ptr<Writer> createWriterELF(TargetHandlerBase *handler);
+std::unique_ptr<Writer> createWriterMachO(const MachOLinkingContext &);
+std::unique_ptr<Writer> createWriterPECOFF(const PECOFFLinkingContext &);
+std::unique_ptr<Writer> createWriterNative();
+std::unique_ptr<Writer> createWriterYAML(const LinkingContext &);
+} // end namespace lld
+
+#endif