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diff --git a/third_party/protobuf/src/google/protobuf/generated_message_util.h b/third_party/protobuf/src/google/protobuf/generated_message_util.h
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@@ -0,0 +1,181 @@
+// 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.
+//
+// This file contains miscellaneous helper code used by generated code --
+// including lite types -- but which should not be used directly by users.
+
+#ifndef GOOGLE_PROTOBUF_GENERATED_MESSAGE_UTIL_H__
+#define GOOGLE_PROTOBUF_GENERATED_MESSAGE_UTIL_H__
+
+#include <assert.h>
+#include <string>
+
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/once.h>
+#include <google/protobuf/has_bits.h>
+
+#ifndef PROTOBUF_FINAL
+#if LANG_CXX11
+#define PROTOBUF_FINAL final
+#else
+#define PROTOBUF_FINAL
+#endif
+#endif  // !PROTOBUF_FINAL
+
+namespace google {
+
+namespace protobuf {
+
+class Arena;
+namespace io { class CodedInputStream; }
+
+namespace internal {
+
+
+// Annotation for the compiler to emit a deprecation message if a field marked
+// with option 'deprecated=true' is used in the code, or for other things in
+// generated code which are deprecated.
+//
+// For internal use in the pb.cc files, deprecation warnings are suppressed
+// there.
+#undef DEPRECATED_PROTOBUF_FIELD
+#define PROTOBUF_DEPRECATED
+
+#define GOOGLE_PROTOBUF_DEPRECATED_ATTR
+
+
+// Constants for special floating point values.
+LIBPROTOBUF_EXPORT double Infinity();
+LIBPROTOBUF_EXPORT double NaN();
+
+// This type is used to define a global variable, without it's constructor
+// and destructor run on start and end of the program lifetime. This circumvents
+// the initial construction order fiasco, while keeping the address of the
+// empty string a compile time constant.
+template <typename T>
+class ExplicitlyConstructed {
+ public:
+  void DefaultConstruct() {
+    new (&union_) T();
+    init_ = true;
+  }
+
+  bool IsInitialized() { return init_; }
+  void Shutdown() {
+    if (init_) {
+      init_ = false;
+      get_mutable()->~T();
+    }
+  }
+
+#if LANG_CXX11
+  constexpr
+#endif
+      const T&
+      get() const {
+    return reinterpret_cast<const T&>(union_);
+  }
+  T* get_mutable() { return reinterpret_cast<T*>(&union_); }
+
+ private:
+  // Prefer c++14 aligned_storage, but for compatibility this will do.
+  union AlignedUnion {
+    char space[sizeof(T)];
+    int64 align_to_int64;
+    void* align_to_ptr;
+  } union_;
+  bool init_;  // false by linker
+};
+
+// TODO(jieluo): Change to template. We have tried to use template,
+// but it causes net/rpc/python:rpcutil_test fail (the empty string will
+// init twice). It may related to swig. Change to template after we
+// found the solution.
+
+// Default empty string object. Don't use this directly. Instead, call
+// GetEmptyString() to get the reference.
+LIBPROTOBUF_EXPORT extern ExplicitlyConstructed< ::std::string> fixed_address_empty_string;
+LIBPROTOBUF_EXPORT extern ProtobufOnceType empty_string_once_init_;
+LIBPROTOBUF_EXPORT void InitEmptyString();
+
+
+LIBPROTOBUF_EXPORT inline const ::std::string& GetEmptyStringAlreadyInited() {
+  return fixed_address_empty_string.get();
+}
+
+LIBPROTOBUF_EXPORT inline const ::std::string& GetEmptyString() {
+  ::google::protobuf::GoogleOnceInit(&empty_string_once_init_, &InitEmptyString);
+  return GetEmptyStringAlreadyInited();
+}
+
+LIBPROTOBUF_EXPORT int StringSpaceUsedExcludingSelf(const string& str);
+
+
+// True if IsInitialized() is true for all elements of t.  Type is expected
+// to be a RepeatedPtrField<some message type>.  It's useful to have this
+// helper here to keep the protobuf compiler from ever having to emit loops in
+// IsInitialized() methods.  We want the C++ compiler to inline this or not
+// as it sees fit.
+template <class Type> bool AllAreInitialized(const Type& t) {
+  for (int i = t.size(); --i >= 0; ) {
+    if (!t.Get(i).IsInitialized()) return false;
+  }
+  return true;
+}
+
+LIBPROTOBUF_EXPORT void InitProtobufDefaults();
+
+// We compute sizes as size_t but cache them as int.  This function converts a
+// computed size to a cached size.  Since we don't proceed with serialization if
+// the total size was > INT_MAX, it is not important what this function returns
+// for inputs > INT_MAX.
+inline int ToCachedSize(size_t size) {
+  return static_cast<int>(size);
+}
+
+// We mainly calculate sizes in terms of size_t, but some functions that compute
+// sizes return "int".  These int sizes are expected to always be positive.
+// This function is more efficient than casting an int to size_t directly on
+// 64-bit platforms because it avoids making the compiler emit a sign extending
+// instruction, which we don't want and don't want to pay for.
+inline size_t FromIntSize(int size) {
+  // Convert to unsigned before widening so sign extension is not necessary.
+  return static_cast<unsigned int>(size);
+}
+
+}  // namespace internal
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_GENERATED_MESSAGE_UTIL_H__