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diff --git a/src/google/protobuf/compiler/objectivec/objectivec_field.h b/src/google/protobuf/compiler/objectivec/objectivec_field.h
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@@ -0,0 +1,194 @@
+// 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.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_OBJECTIVEC_FIELD_H__
+#define GOOGLE_PROTOBUF_COMPILER_OBJECTIVEC_FIELD_H__
+
+#include <map>
+#include <string>
+#include <google/protobuf/compiler/objectivec/objectivec_helpers.h>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/descriptor.h>
+
+namespace google {
+namespace protobuf {
+
+namespace io {
+class Printer;  // printer.h
+}  // namespace io
+
+namespace compiler {
+namespace objectivec {
+
+class FieldGenerator {
+ public:
+  static FieldGenerator* Make(const FieldDescriptor* field,
+                              const Options& options);
+
+  virtual ~FieldGenerator();
+
+  // Exposed for subclasses to fill in.
+  virtual void GenerateFieldStorageDeclaration(io::Printer* printer) const = 0;
+  virtual void GeneratePropertyDeclaration(io::Printer* printer) const = 0;
+  virtual void GeneratePropertyImplementation(io::Printer* printer) const = 0;
+
+  // Called by GenerateFieldDescription, exposed for classes that need custom
+  // generation.
+
+  // Exposed for subclasses to extend, base does nothing.
+  virtual void GenerateCFunctionDeclarations(io::Printer* printer) const;
+  virtual void GenerateCFunctionImplementations(io::Printer* printer) const;
+
+  // Exposed for subclasses, should always call it on the parent class also.
+  virtual void DetermineForwardDeclarations(set<string>* fwd_decls) const;
+
+  // Used during generation, not intended to be extended by subclasses.
+  void GenerateFieldDescription(
+      io::Printer* printer, bool include_default) const;
+  void GenerateFieldNumberConstant(io::Printer* printer) const;
+
+  // Exposed to get and set the has bits information.
+  virtual bool RuntimeUsesHasBit(void) const = 0;
+  void SetRuntimeHasBit(int has_index);
+  void SetNoHasBit(void);
+  virtual int ExtraRuntimeHasBitsNeeded(void) const;
+  virtual void SetExtraRuntimeHasBitsBase(int index_base);
+  void SetOneofIndexBase(int index_base);
+
+  string variable(const char* key) const {
+    return variables_.find(key)->second;
+  }
+
+  bool needs_textformat_name_support() const {
+    const string& field_flags = variable("fieldflags");
+    return field_flags.find("GPBFieldTextFormatNameCustom") != string::npos;
+  }
+  string generated_objc_name() const { return variable("name"); }
+  string raw_field_name() const { return variable("raw_field_name"); }
+
+ protected:
+  FieldGenerator(const FieldDescriptor* descriptor, const Options& options);
+
+  virtual void FinishInitialization(void);
+  virtual bool WantsHasProperty(void) const = 0;
+
+  const FieldDescriptor* descriptor_;
+  map<string, string> variables_;
+
+ private:
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGenerator);
+};
+
+class SingleFieldGenerator : public FieldGenerator {
+ public:
+  virtual ~SingleFieldGenerator();
+
+  virtual void GenerateFieldStorageDeclaration(io::Printer* printer) const;
+  virtual void GeneratePropertyDeclaration(io::Printer* printer) const;
+
+  virtual void GeneratePropertyImplementation(io::Printer* printer) const;
+
+  virtual bool RuntimeUsesHasBit(void) const;
+
+ protected:
+  SingleFieldGenerator(const FieldDescriptor* descriptor,
+                       const Options& options);
+  virtual bool WantsHasProperty(void) const;
+
+ private:
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(SingleFieldGenerator);
+};
+
+// Subclass with common support for when the field ends up as an ObjC Object.
+class ObjCObjFieldGenerator : public SingleFieldGenerator {
+ public:
+  virtual ~ObjCObjFieldGenerator();
+
+  virtual void GenerateFieldStorageDeclaration(io::Printer* printer) const;
+  virtual void GeneratePropertyDeclaration(io::Printer* printer) const;
+
+ protected:
+  ObjCObjFieldGenerator(const FieldDescriptor* descriptor,
+                        const Options& options);
+
+ private:
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ObjCObjFieldGenerator);
+};
+
+class RepeatedFieldGenerator : public ObjCObjFieldGenerator {
+ public:
+  virtual ~RepeatedFieldGenerator();
+
+  virtual void GenerateFieldStorageDeclaration(io::Printer* printer) const;
+  virtual void GeneratePropertyDeclaration(io::Printer* printer) const;
+
+  virtual void GeneratePropertyImplementation(io::Printer* printer) const;
+
+  virtual bool RuntimeUsesHasBit(void) const;
+
+ protected:
+  RepeatedFieldGenerator(const FieldDescriptor* descriptor,
+                         const Options& options);
+  virtual void FinishInitialization(void);
+  virtual bool WantsHasProperty(void) const;
+
+ private:
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(RepeatedFieldGenerator);
+};
+
+// Convenience class which constructs FieldGenerators for a Descriptor.
+class FieldGeneratorMap {
+ public:
+  FieldGeneratorMap(const Descriptor* descriptor, const Options& options);
+  ~FieldGeneratorMap();
+
+  const FieldGenerator& get(const FieldDescriptor* field) const;
+  const FieldGenerator& get_extension(int index) const;
+
+  // Assigns the has bits and returns the number of bits needed.
+  int CalculateHasBits(void);
+
+  void SetOneofIndexBase(int index_base);
+
+  // Check if any field of this message has a non zero default.
+  bool DoesAnyFieldHaveNonZeroDefault(void) const;
+
+ private:
+  const Descriptor* descriptor_;
+  scoped_array<scoped_ptr<FieldGenerator> > field_generators_;
+  scoped_array<scoped_ptr<FieldGenerator> > extension_generators_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGeneratorMap);
+};
+}  // namespace objectivec
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_OBJECTIVEC_FIELD_H__