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diff --git a/include/google/protobuf/compiler/cpp/file.h b/include/google/protobuf/compiler/cpp/file.h
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_CPP_FILE_H__
+#define GOOGLE_PROTOBUF_COMPILER_CPP_FILE_H__
+
+#include <algorithm>
+#include <memory>
+#include <set>
+#include <string>
+#include <vector>
+
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/compiler/cpp/field.h>
+#include <google/protobuf/compiler/cpp/helpers.h>
+#include <google/protobuf/compiler/scc.h>
+#include <google/protobuf/compiler/cpp/options.h>
+
+namespace google {
+namespace protobuf {
+class FileDescriptor;  // descriptor.h
+namespace io {
+class Printer;  // printer.h
+}
+}  // namespace protobuf
+}  // namespace google
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace cpp {
+
+class EnumGenerator;       // enum.h
+class MessageGenerator;    // message.h
+class ServiceGenerator;    // service.h
+class ExtensionGenerator;  // extension.h
+
+class FileGenerator {
+ public:
+  // See generator.cc for the meaning of dllexport_decl.
+  FileGenerator(const FileDescriptor* file, const Options& options);
+  ~FileGenerator();
+
+  // Shared code between the two header generators below.
+  void GenerateHeader(io::Printer* printer);
+
+  // info_path, if non-empty, should be the path (relative to printer's
+  // output) to the metadata file describing this proto header.
+  void GenerateProtoHeader(io::Printer* printer, const std::string& info_path);
+  // info_path, if non-empty, should be the path (relative to printer's
+  // output) to the metadata file describing this PB header.
+  void GeneratePBHeader(io::Printer* printer, const std::string& info_path);
+  void GenerateSource(io::Printer* printer);
+
+  // The following member functions are used when the lite_implicit_weak_fields
+  // option is set. In this mode the code is organized a bit differently to
+  // promote better linker stripping of unused code. In particular, we generate
+  // one .cc file per message, one .cc file per extension, and a main pb.cc file
+  // containing everything else.
+
+  int NumMessages() const { return message_generators_.size(); }
+  int NumExtensions() const { return extension_generators_.size(); }
+  // Generates the source file for one message.
+  void GenerateSourceForMessage(int idx, io::Printer* printer);
+  // Generates the source file for one extension.
+  void GenerateSourceForExtension(int idx, io::Printer* printer);
+  // Generates a source file containing everything except messages and
+  // extensions.
+  void GenerateGlobalSource(io::Printer* printer);
+
+ private:
+  // Internal type used by GenerateForwardDeclarations (defined in file.cc).
+  class ForwardDeclarations;
+  struct CrossFileReferences;
+
+  void IncludeFile(const std::string& google3_name, io::Printer* printer) {
+    DoIncludeFile(google3_name, false, printer);
+  }
+  void IncludeFileAndExport(const std::string& google3_name,
+                            io::Printer* printer) {
+    DoIncludeFile(google3_name, true, printer);
+  }
+  void DoIncludeFile(const std::string& google3_name, bool do_export,
+                     io::Printer* printer);
+
+  std::string CreateHeaderInclude(const std::string& basename,
+                                  const FileDescriptor* file);
+  void GetCrossFileReferencesForField(const FieldDescriptor* field,
+                                      CrossFileReferences* refs);
+  void GetCrossFileReferencesForFile(const FileDescriptor* file,
+                                     CrossFileReferences* refs);
+  void GenerateInternalForwardDeclarations(const CrossFileReferences& refs,
+                                           io::Printer* printer);
+  void GenerateSourceIncludes(io::Printer* printer);
+  void GenerateSourcePrelude(io::Printer* printer);
+  void GenerateSourceDefaultInstance(int idx, io::Printer* printer);
+
+  void GenerateInitForSCC(const SCC* scc, const CrossFileReferences& refs,
+                          io::Printer* printer);
+  void GenerateReflectionInitializationCode(io::Printer* printer);
+
+  // For other imports, generates their forward-declarations.
+  void GenerateForwardDeclarations(io::Printer* printer);
+
+  // Generates top or bottom of a header file.
+  void GenerateTopHeaderGuard(io::Printer* printer, bool pb_h);
+  void GenerateBottomHeaderGuard(io::Printer* printer, bool pb_h);
+
+  // Generates #include directives.
+  void GenerateLibraryIncludes(io::Printer* printer);
+  void GenerateDependencyIncludes(io::Printer* printer);
+
+  // Generate a pragma to pull in metadata using the given info_path (if
+  // non-empty). info_path should be relative to printer's output.
+  void GenerateMetadataPragma(io::Printer* printer,
+                              const std::string& info_path);
+
+  // Generates a couple of different pieces before definitions:
+  void GenerateGlobalStateFunctionDeclarations(io::Printer* printer);
+
+  // Generates types for classes.
+  void GenerateMessageDefinitions(io::Printer* printer);
+
+  void GenerateEnumDefinitions(io::Printer* printer);
+
+  // Generates generic service definitions.
+  void GenerateServiceDefinitions(io::Printer* printer);
+
+  // Generates extension identifiers.
+  void GenerateExtensionIdentifiers(io::Printer* printer);
+
+  // Generates inline function definitions.
+  void GenerateInlineFunctionDefinitions(io::Printer* printer);
+
+  void GenerateProto2NamespaceEnumSpecializations(io::Printer* printer);
+
+  // Sometimes the names we use in a .proto file happen to be defined as
+  // macros on some platforms (e.g., macro/minor used in plugin.proto are
+  // defined as macros in sys/types.h on FreeBSD and a few other platforms).
+  // To make the generated code compile on these platforms, we either have to
+  // undef the macro for these few platforms, or rename the field name for all
+  // platforms. Since these names are part of protobuf public API, renaming is
+  // generally a breaking change so we prefer the #undef approach.
+  void GenerateMacroUndefs(io::Printer* printer);
+
+  bool IsDepWeak(const FileDescriptor* dep) const {
+    if (weak_deps_.count(dep) != 0) {
+      GOOGLE_CHECK(!options_.opensource_runtime);
+      return true;
+    }
+    return false;
+  }
+
+  std::set<const FileDescriptor*> weak_deps_;
+
+  const FileDescriptor* file_;
+  const Options options_;
+
+  MessageSCCAnalyzer scc_analyzer_;
+
+  std::map<std::string, std::string> variables_;
+
+  // Contains the post-order walk of all the messages (and child messages) in
+  // this file. If you need a pre-order walk just reverse iterate.
+  std::vector<std::unique_ptr<MessageGenerator>> message_generators_;
+  std::vector<std::unique_ptr<EnumGenerator>> enum_generators_;
+  std::vector<std::unique_ptr<ServiceGenerator>> service_generators_;
+  std::vector<std::unique_ptr<ExtensionGenerator>> extension_generators_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FileGenerator);
+};
+
+}  // namespace cpp
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
+
+#endif  // GOOGLE_PROTOBUF_COMPILER_CPP_FILE_H__