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diff --git a/include/clang/Frontend/SerializedDiagnosticReader.h b/include/clang/Frontend/SerializedDiagnosticReader.h
new file mode 100644
index 000000000000..92e99d305da5
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+++ b/include/clang/Frontend/SerializedDiagnosticReader.h
@@ -0,0 +1,131 @@
+//===--- SerializedDiagnosticReader.h - Reads diagnostics -------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_FRONTEND_SERIALIZED_DIAGNOSTIC_READER_H_
+#define LLVM_CLANG_FRONTEND_SERIALIZED_DIAGNOSTIC_READER_H_
+
+#include "clang/Basic/LLVM.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/Bitcode/BitstreamReader.h"
+#include "llvm/Support/ErrorOr.h"
+
+namespace clang {
+namespace serialized_diags {
+
+enum class SDError {
+  CouldNotLoad = 1,
+  InvalidSignature,
+  InvalidDiagnostics,
+  MalformedTopLevelBlock,
+  MalformedSubBlock,
+  MalformedBlockInfoBlock,
+  MalformedMetadataBlock,
+  MalformedDiagnosticBlock,
+  MalformedDiagnosticRecord,
+  MissingVersion,
+  VersionMismatch,
+  UnsupportedConstruct,
+  /// A generic error for subclass handlers that don't want or need to define
+  /// their own error_category.
+  HandlerFailed
+};
+
+const std::error_category &SDErrorCategory();
+
+inline std::error_code make_error_code(SDError E) {
+  return std::error_code(static_cast<int>(E), SDErrorCategory());
+}
+
+/// \brief A location that is represented in the serialized diagnostics.
+struct Location {
+  unsigned FileID;
+  unsigned Line;
+  unsigned Col;
+  unsigned Offset;
+  Location(unsigned FileID, unsigned Line, unsigned Col, unsigned Offset)
+      : FileID(FileID), Line(Line), Col(Col), Offset(Offset) {}
+};
+
+/// \brief A base class that handles reading serialized diagnostics from a file.
+///
+/// Subclasses should override the visit* methods with their logic for handling
+/// the various constructs that are found in serialized diagnostics.
+class SerializedDiagnosticReader {
+public:
+  SerializedDiagnosticReader() {}
+  virtual ~SerializedDiagnosticReader() {}
+
+  /// \brief Read the diagnostics in \c File
+  std::error_code readDiagnostics(StringRef File);
+
+private:
+  enum class Cursor;
+
+  /// \brief Read to the next record or block to process.
+  llvm::ErrorOr<Cursor> skipUntilRecordOrBlock(llvm::BitstreamCursor &Stream,
+                                               unsigned &BlockOrRecordId);
+
+  /// \brief Read a metadata block from \c Stream.
+  std::error_code readMetaBlock(llvm::BitstreamCursor &Stream);
+
+  /// \brief Read a diagnostic block from \c Stream.
+  std::error_code readDiagnosticBlock(llvm::BitstreamCursor &Stream);
+
+protected:
+  /// \brief Visit the start of a diagnostic block.
+  virtual std::error_code visitStartOfDiagnostic() {
+    return std::error_code();
+  };
+  /// \brief Visit the end of a diagnostic block.
+  virtual std::error_code visitEndOfDiagnostic() { return std::error_code(); };
+  /// \brief Visit a category. This associates the category \c ID to a \c Name.
+  virtual std::error_code visitCategoryRecord(unsigned ID, StringRef Name) {
+    return std::error_code();
+  };
+  /// \brief Visit a flag. This associates the flag's \c ID to a \c Name.
+  virtual std::error_code visitDiagFlagRecord(unsigned ID, StringRef Name) {
+    return std::error_code();
+  };
+  /// \brief Visit a diagnostic.
+  virtual std::error_code
+  visitDiagnosticRecord(unsigned Severity, const Location &Location,
+                        unsigned Category, unsigned Flag, StringRef Message) {
+    return std::error_code();
+  };
+  /// \brief Visit a filename. This associates the file's \c ID to a \c Name.
+  virtual std::error_code visitFilenameRecord(unsigned ID, unsigned Size,
+                                              unsigned Timestamp,
+                                              StringRef Name) {
+    return std::error_code();
+  };
+  /// \brief Visit a fixit hint.
+  virtual std::error_code
+  visitFixitRecord(const Location &Start, const Location &End, StringRef Text) {
+    return std::error_code();
+  };
+  /// \brief Visit a source range.
+  virtual std::error_code visitSourceRangeRecord(const Location &Start,
+                                                 const Location &End) {
+    return std::error_code();
+  };
+  /// \brief Visit the version of the set of diagnostics.
+  virtual std::error_code visitVersionRecord(unsigned Version) {
+    return std::error_code();
+  };
+};
+
+} // end serialized_diags namespace
+} // end clang namespace
+
+namespace std {
+template <>
+struct is_error_code_enum<clang::serialized_diags::SDError> : std::true_type {};
+}
+
+#endif