--- /dev/null
+//===-- llvm/Bitcode/BitcodeWriter.h - Bitcode writers ----*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This header defines interfaces to write LLVM bitcode files/streams.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_BITCODE_BITCODEWRITER_H
+#define LLVM_BITCODE_BITCODEWRITER_H
+
+#include "llvm/IR/ModuleSummaryIndex.h"
+#include <string>
+
+namespace llvm {
+ class Module;
+ class raw_ostream;
+
+ /// \brief Write the specified module to the specified raw output stream.
+ ///
+ /// For streams where it matters, the given stream should be in "binary"
+ /// mode.
+ ///
+ /// If \c ShouldPreserveUseListOrder, encode the use-list order for each \a
+ /// Value in \c M. These will be reconstructed exactly when \a M is
+ /// deserialized.
+ ///
+ /// If \c Index is supplied, the bitcode will contain the summary index
+ /// (currently for use in ThinLTO optimization).
+ ///
+ /// \p GenerateHash enables hashing the Module and including the hash in the
+ /// bitcode (currently for use in ThinLTO incremental build).
+ void WriteBitcodeToFile(const Module *M, raw_ostream &Out,
+ bool ShouldPreserveUseListOrder = false,
+ const ModuleSummaryIndex *Index = nullptr,
+ bool GenerateHash = false);
+
+ /// Write the specified module summary index to the given raw output stream,
+ /// where it will be written in a new bitcode block. This is used when
+ /// writing the combined index file for ThinLTO. When writing a subset of the
+ /// index for a distributed backend, provide the \p ModuleToSummariesForIndex
+ /// map.
+ void WriteIndexToFile(const ModuleSummaryIndex &Index, raw_ostream &Out,
+ const std::map<std::string, GVSummaryMapTy>
+ *ModuleToSummariesForIndex = nullptr);
+} // End llvm namespace
+
+#endif