third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_message.h

Index: third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_message.h
diff --git a/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_message.h b/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_message.h
index 31223e13ff4d7395940a4fb04cd0c48153f2303b..3bdc0ed3975dfa1cdeb6b768ff0added5ef4ab3f 100644
--- a/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_message.h
+++ b/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_message.h
@@ -66,7 +66,7 @@ class MessageGenerator {
 
   // Header stuff.
 
-  // Return names for foward declarations of this class and all its nested
+  // Return names for forward declarations of this class and all its nested
   // types. A given key in {class,enum}_names will map from a class name to the
   // descriptor that was responsible for its inclusion in the map. This can be
   // used to associate the descriptor with the code generated for it.
@@ -165,6 +165,11 @@ class MessageGenerator {
   void GenerateSerializeOneField(io::Printer* printer,
                                  const FieldDescriptor* field,
                                  bool unbounded);
+  // Generate a switch statement to serialize 2+ fields from the same oneof.
+  // Or, if fields.size() == 1, just call GenerateSerializeOneField().
+  void GenerateSerializeOneofFields(
+      io::Printer* printer, const vector<const FieldDescriptor*>& fields,
+      bool to_array);
   void GenerateSerializeOneExtensionRange(
       io::Printer* printer, const Descriptor::ExtensionRange* range,
       bool unbounded);
@@ -189,6 +194,11 @@ class MessageGenerator {
   string classname_;
   Options options_;
   FieldGeneratorMap field_generators_;
+  // optimized_order_ is the order we layout the message's fields in the class.
+  // This is reused to initialize the fields in-order for cache efficiency.
+  //
+  // optimized_order_ excludes oneof fields.
+  vector<const FieldDescriptor *> optimized_order_;
   vector< vector<string> > runs_of_fields_;  // that might be trivially cleared
   google::protobuf::scoped_array<google::protobuf::scoped_ptr<MessageGenerator> > nested_generators_;
   google::protobuf::scoped_array<google::protobuf::scoped_ptr<EnumGenerator> > enum_generators_;