Merge pull request #625 from jskeet/reflection-refactor

Reflection refactor

9 files changed, 231 insertions, 518 deletions

diff --git a/csharp/src/Google.Protobuf.Test/GeneratedMessageTest.cs b/csharp/src/Google.Protobuf.Test/GeneratedMessageTest.cs
index acb20b15..180976d1 100644
--- a/csharp/src/Google.Protobuf.Test/GeneratedMessageTest.cs
+++ b/csharp/src/Google.Protobuf.Test/GeneratedMessageTest.cs
@@ -604,7 +604,7 @@ namespace Google.Protobuf
         public void Reflection_GetValue()

         {

             var message = SampleMessages.CreateFullTestAllTypes();

-            var fields = ((IReflectedMessage) message).Fields;

+            var fields = TestAllTypes.Descriptor.FieldAccessorsByFieldNumber;

             Assert.AreEqual(message.SingleBool, fields[TestAllTypes.SingleBoolFieldNumber].GetValue(message));

             Assert.AreEqual(message.SingleBytes, fields[TestAllTypes.SingleBytesFieldNumber].GetValue(message));

             Assert.AreEqual(message.SingleDouble, fields[TestAllTypes.SingleDoubleFieldNumber].GetValue(message));

@@ -639,7 +639,7 @@ namespace Google.Protobuf
 

             // Just a single map field, for the same reason

             var mapMessage = new TestMap { MapStringString = { { "key1", "value1" }, { "key2", "value2" } } };

-            fields = ((IReflectedMessage) mapMessage).Fields;

+            fields = TestMap.Descriptor.FieldAccessorsByFieldNumber;

             var dictionary = (IDictionary) fields[TestMap.MapStringStringFieldNumber].GetValue(mapMessage);

             Assert.AreEqual(mapMessage.MapStringString, dictionary);

             Assert.AreEqual("value1", dictionary["key1"]);

@@ -648,8 +648,8 @@ namespace Google.Protobuf
         [Test]

         public void Reflection_Clear()

         {

-            IReflectedMessage message = SampleMessages.CreateFullTestAllTypes();

-            var fields = message.Fields;

+            var message = SampleMessages.CreateFullTestAllTypes();

+            var fields = TestAllTypes.Descriptor.FieldAccessorsByFieldNumber;

             fields[TestAllTypes.SingleBoolFieldNumber].Clear(message);

             fields[TestAllTypes.SingleInt32FieldNumber].Clear(message);

             fields[TestAllTypes.SingleStringFieldNumber].Clear(message);

@@ -673,7 +673,7 @@ namespace Google.Protobuf
 

             // Separately, maps.

             var mapMessage = new TestMap { MapStringString = { { "key1", "value1" }, { "key2", "value2" } } };

-            fields = ((IReflectedMessage) mapMessage).Fields;

+            fields = TestMap.Descriptor.FieldAccessorsByFieldNumber;

             fields[TestMap.MapStringStringFieldNumber].Clear(mapMessage);

             Assert.AreEqual(0, mapMessage.MapStringString.Count);

         }

@@ -682,8 +682,8 @@ namespace Google.Protobuf
         public void Reflection_SetValue_SingleFields()

         {

             // Just a sample (primitives, messages, enums, strings, byte strings)

-            IReflectedMessage message = SampleMessages.CreateFullTestAllTypes();

-            var fields = message.Fields;

+            var message = SampleMessages.CreateFullTestAllTypes();

+            var fields = TestAllTypes.Descriptor.FieldAccessorsByFieldNumber;

             fields[TestAllTypes.SingleBoolFieldNumber].SetValue(message, false);

             fields[TestAllTypes.SingleInt32FieldNumber].SetValue(message, 500);

             fields[TestAllTypes.SingleStringFieldNumber].SetValue(message, "It's a string");

@@ -709,51 +709,52 @@ namespace Google.Protobuf
         [Test]

         public void Reflection_SetValue_SingleFields_WrongType()

         {

-            IReflectedMessage message = SampleMessages.CreateFullTestAllTypes();

-            var fields = message.Fields;

+            IMessage message = SampleMessages.CreateFullTestAllTypes();

+            var fields = message.Descriptor.FieldAccessorsByFieldNumber;

             Assert.Throws<InvalidCastException>(() => fields[TestAllTypes.SingleBoolFieldNumber].SetValue(message, "This isn't a bool"));

         }

 

         [Test]

         public void Reflection_SetValue_MapFields()

         {

-            IReflectedMessage message = new TestMap();

-            var fields = message.Fields;

+            IMessage message = new TestMap();

+            var fields = message.Descriptor.FieldAccessorsByFieldNumber;

             Assert.Throws<InvalidOperationException>(() => fields[TestMap.MapStringStringFieldNumber].SetValue(message, new Dictionary<string, string>()));

         }

 

         [Test]

         public void Reflection_SetValue_RepeatedFields()

         {

-            IReflectedMessage message = SampleMessages.CreateFullTestAllTypes();

-            var fields = message.Fields;

+            IMessage message = SampleMessages.CreateFullTestAllTypes();

+            var fields = message.Descriptor.FieldAccessorsByFieldNumber;

             Assert.Throws<InvalidOperationException>(() => fields[TestAllTypes.RepeatedDoubleFieldNumber].SetValue(message, new double[10]));

         }

 

         [Test]

         public void Reflection_GetValue_IncorrectType()

         {

-            IReflectedMessage message = SampleMessages.CreateFullTestAllTypes();

-            Assert.Throws<InvalidCastException>(() => message.Fields[TestAllTypes.SingleBoolFieldNumber].GetValue(new TestMap()));

+            IMessage message = SampleMessages.CreateFullTestAllTypes();

+            var fields = message.Descriptor.FieldAccessorsByFieldNumber;

+            Assert.Throws<InvalidCastException>(() => fields[TestAllTypes.SingleBoolFieldNumber].GetValue(new TestMap()));

         }

 

         [Test]

         public void Reflection_Oneof()

         {

             var message = new TestAllTypes();

-            var fields = ((IReflectedMessage) message).Fields;

-            Assert.AreEqual(1, fields.Oneofs.Count);

-            var oneof = fields.Oneofs[0];

-            Assert.AreEqual("oneof_field", oneof.Descriptor.Name);

-            Assert.IsNull(oneof.GetCaseFieldDescriptor(message));

+            var descriptor = TestAllTypes.Descriptor;

+            Assert.AreEqual(1, descriptor.Oneofs.Count);

+            var oneof = descriptor.Oneofs[0];

+            Assert.AreEqual("oneof_field", oneof.Name);

+            Assert.IsNull(oneof.Accessor.GetCaseFieldDescriptor(message));

 

             message.OneofString = "foo";

-            Assert.AreSame(fields[TestAllTypes.OneofStringFieldNumber].Descriptor, oneof.GetCaseFieldDescriptor(message));

+            Assert.AreSame(descriptor.FieldAccessorsByFieldNumber[TestAllTypes.OneofStringFieldNumber].Descriptor, oneof.Accessor.GetCaseFieldDescriptor(message));

 

             message.OneofUint32 = 10;

-            Assert.AreSame(fields[TestAllTypes.OneofUint32FieldNumber].Descriptor, oneof.GetCaseFieldDescriptor(message));

+            Assert.AreSame(descriptor.FieldAccessorsByFieldNumber[TestAllTypes.OneofUint32FieldNumber].Descriptor, oneof.Accessor.GetCaseFieldDescriptor(message));

 

-            oneof.Clear(message);

+            oneof.Accessor.Clear(message);

             Assert.AreEqual(TestAllTypes.OneofFieldOneofCase.None, message.OneofFieldCase);

         }

     }

diff --git a/csharp/src/Google.Protobuf.Test/Reflection/DescriptorsTest.cs b/csharp/src/Google.Protobuf.Test/Reflection/DescriptorsTest.cs
index 0db01a5e..0aff0a6c 100644
--- a/csharp/src/Google.Protobuf.Test/Reflection/DescriptorsTest.cs
+++ b/csharp/src/Google.Protobuf.Test/Reflection/DescriptorsTest.cs
@@ -62,6 +62,7 @@ namespace Google.Protobuf.Reflection
             Assert.AreEqual(UnittestImportProto3.Descriptor, file.Dependencies[0]);
 
             MessageDescriptor messageType = TestAllTypes.Descriptor;
+            Assert.AreSame(typeof(TestAllTypes), messageType.GeneratedType);
             Assert.AreEqual(messageType, file.MessageTypes[0]);
             Assert.AreEqual(messageType, file.FindTypeByName<MessageDescriptor>("TestAllTypes"));
             Assert.Null(file.FindTypeByName<MessageDescriptor>("NoSuchType"));
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs
index 5f6eae0c..7da82bf0 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs
@@ -12,15 +12,6 @@ namespace Google.Protobuf.TestProtos {
   [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
   public static partial class MapUnittestProto3 {
 
-    #region Static variables
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestMap__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestMapSubmessage__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestMessageMap__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestSameTypeMap__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestArenaMap__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_MessageContainingEnumCalledType__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_MessageContainingMapCalledEntry__FieldAccessorTable;
-    #endregion
     #region Descriptor
     public static pbr::FileDescriptor Descriptor {
       get { return descriptor; }
@@ -153,32 +144,18 @@ namespace Google.Protobuf.TestProtos {
             "dHJ5LkVudHJ5RW50cnkaLAoKRW50cnlFbnRyeRILCgNrZXkYASABKAUSDQoF", 
             "dmFsdWUYAiABKAU6AjgBKj8KB01hcEVudW0SEAoMTUFQX0VOVU1fRk9PEAAS", 
             "EAoMTUFQX0VOVU1fQkFSEAESEAoMTUFQX0VOVU1fQkFaEAJCIPgBAaoCGkdv", 
-          "b2dsZS5Qcm90b2J1Zi5UZXN0UHJvdG9zYgZwcm90bzM="));
+            "b2dsZS5Qcm90b2J1Zi5UZXN0UHJvdG9zYgZwcm90bzM="));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
-          new pbr::FileDescriptor[] {
-          global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor, 
-          });
-      internal__static_protobuf_unittest_TestMap__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMap), descriptor.MessageTypes[0],
-              new string[] { "MapInt32Int32", "MapInt64Int64", "MapUint32Uint32", "MapUint64Uint64", "MapSint32Sint32", "MapSint64Sint64", "MapFixed32Fixed32", "MapFixed64Fixed64", "MapSfixed32Sfixed32", "MapSfixed64Sfixed64", "MapInt32Float", "MapInt32Double", "MapBoolBool", "MapStringString", "MapInt32Bytes", "MapInt32Enum", "MapInt32ForeignMessage", }, new string[] { });
-      internal__static_protobuf_unittest_TestMapSubmessage__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMapSubmessage), descriptor.MessageTypes[1],
-              new string[] { "TestMap", }, new string[] { });
-      internal__static_protobuf_unittest_TestMessageMap__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMessageMap), descriptor.MessageTypes[2],
-              new string[] { "MapInt32Message", }, new string[] { });
-      internal__static_protobuf_unittest_TestSameTypeMap__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestSameTypeMap), descriptor.MessageTypes[3],
-              new string[] { "Map1", "Map2", }, new string[] { });
-      internal__static_protobuf_unittest_TestArenaMap__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestArenaMap), descriptor.MessageTypes[4],
-              new string[] { "MapInt32Int32", "MapInt64Int64", "MapUint32Uint32", "MapUint64Uint64", "MapSint32Sint32", "MapSint64Sint64", "MapFixed32Fixed32", "MapFixed64Fixed64", "MapSfixed32Sfixed32", "MapSfixed64Sfixed64", "MapInt32Float", "MapInt32Double", "MapBoolBool", "MapInt32Enum", "MapInt32ForeignMessage", }, new string[] { });
-      internal__static_protobuf_unittest_MessageContainingEnumCalledType__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.MessageContainingEnumCalledType), descriptor.MessageTypes[5],
-              new string[] { "Type", }, new string[] { });
-      internal__static_protobuf_unittest_MessageContainingMapCalledEntry__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.MessageContainingMapCalledEntry), descriptor.MessageTypes[6],
-              new string[] { "Entry", }, new string[] { });
+          new pbr::FileDescriptor[] { global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor, },
+          new pbr::GeneratedCodeInfo(new[] {typeof(global::Google.Protobuf.TestProtos.MapEnum), }, new pbr::GeneratedCodeInfo[] {
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestMap), new[]{ "MapInt32Int32", "MapInt64Int64", "MapUint32Uint32", "MapUint64Uint64", "MapSint32Sint32", "MapSint64Sint64", "MapFixed32Fixed32", "MapFixed64Fixed64", "MapSfixed32Sfixed32", "MapSfixed64Sfixed64", "MapInt32Float", "MapInt32Double", "MapBoolBool", "MapStringString", "MapInt32Bytes", "MapInt32Enum", "MapInt32ForeignMessage" }, null, null, new pbr::GeneratedCodeInfo[] { null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, }),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestMapSubmessage), new[]{ "TestMap" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestMessageMap), new[]{ "MapInt32Message" }, null, null, new pbr::GeneratedCodeInfo[] { null, }),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestSameTypeMap), new[]{ "Map1", "Map2" }, null, null, new pbr::GeneratedCodeInfo[] { null, null, }),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestArenaMap), new[]{ "MapInt32Int32", "MapInt64Int64", "MapUint32Uint32", "MapUint64Uint64", "MapSint32Sint32", "MapSint64Sint64", "MapFixed32Fixed32", "MapFixed64Fixed64", "MapSfixed32Sfixed32", "MapSfixed64Sfixed64", "MapInt32Float", "MapInt32Double", "MapBoolBool", "MapInt32Enum", "MapInt32ForeignMessage" }, null, null, new pbr::GeneratedCodeInfo[] { null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, }),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.MessageContainingEnumCalledType), new[]{ "Type" }, null, new[]{ typeof(global::Google.Protobuf.TestProtos.MessageContainingEnumCalledType.Types.Type) }, new pbr::GeneratedCodeInfo[] { null, }),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.MessageContainingMapCalledEntry), new[]{ "Entry" }, null, null, new pbr::GeneratedCodeInfo[] { null, })
+          }));
     }
     #endregion
 
@@ -198,14 +175,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestMap> _parser = new pb::MessageParser<TestMap>(() => new TestMap());
     public static pb::MessageParser<TestMap> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "map_bool_bool", "map_fixed32_fixed32", "map_fixed64_fixed64", "map_int32_bytes", "map_int32_double", "map_int32_enum", "map_int32_float", "map_int32_foreign_message", "map_int32_int32", "map_int64_int64", "map_sfixed32_sfixed32", "map_sfixed64_sfixed64", "map_sint32_sint32", "map_sint64_sint64", "map_string_string", "map_uint32_uint32", "map_uint64_uint64" };
-    private static readonly uint[] _fieldTags = new uint[] { 106, 58, 66, 122, 98, 130, 90, 138, 10, 18, 74, 82, 42, 50, 114, 26, 34 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.MapUnittestProto3.Descriptor.MessageTypes[0]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.MapUnittestProto3.internal__static_protobuf_unittest_TestMap__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -613,14 +588,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestMapSubmessage> _parser = new pb::MessageParser<TestMapSubmessage>(() => new TestMapSubmessage());
     public static pb::MessageParser<TestMapSubmessage> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "test_map" };
-    private static readonly uint[] _fieldTags = new uint[] { 10 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.MapUnittestProto3.Descriptor.MessageTypes[1]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.MapUnittestProto3.internal__static_protobuf_unittest_TestMapSubmessage__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -739,14 +712,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestMessageMap> _parser = new pb::MessageParser<TestMessageMap>(() => new TestMessageMap());
     public static pb::MessageParser<TestMessageMap> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "map_int32_message" };
-    private static readonly uint[] _fieldTags = new uint[] { 10 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.MapUnittestProto3.Descriptor.MessageTypes[2]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.MapUnittestProto3.internal__static_protobuf_unittest_TestMessageMap__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -850,14 +821,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestSameTypeMap> _parser = new pb::MessageParser<TestSameTypeMap>(() => new TestSameTypeMap());
     public static pb::MessageParser<TestSameTypeMap> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "map1", "map2" };
-    private static readonly uint[] _fieldTags = new uint[] { 10, 18 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.MapUnittestProto3.Descriptor.MessageTypes[3]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.MapUnittestProto3.internal__static_protobuf_unittest_TestSameTypeMap__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -980,14 +949,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestArenaMap> _parser = new pb::MessageParser<TestArenaMap>(() => new TestArenaMap());
     public static pb::MessageParser<TestArenaMap> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "map_bool_bool", "map_fixed32_fixed32", "map_fixed64_fixed64", "map_int32_double", "map_int32_enum", "map_int32_float", "map_int32_foreign_message", "map_int32_int32", "map_int64_int64", "map_sfixed32_sfixed32", "map_sfixed64_sfixed64", "map_sint32_sint32", "map_sint64_sint64", "map_uint32_uint32", "map_uint64_uint64" };
-    private static readonly uint[] _fieldTags = new uint[] { 106, 58, 66, 98, 114, 90, 122, 10, 18, 74, 82, 42, 50, 26, 34 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.MapUnittestProto3.Descriptor.MessageTypes[4]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.MapUnittestProto3.internal__static_protobuf_unittest_TestArenaMap__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -1357,14 +1324,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<MessageContainingEnumCalledType> _parser = new pb::MessageParser<MessageContainingEnumCalledType>(() => new MessageContainingEnumCalledType());
     public static pb::MessageParser<MessageContainingEnumCalledType> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "type" };
-    private static readonly uint[] _fieldTags = new uint[] { 10 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.MapUnittestProto3.Descriptor.MessageTypes[5]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.MapUnittestProto3.internal__static_protobuf_unittest_MessageContainingEnumCalledType__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -1478,14 +1443,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<MessageContainingMapCalledEntry> _parser = new pb::MessageParser<MessageContainingMapCalledEntry>(() => new MessageContainingMapCalledEntry());
     public static pb::MessageParser<MessageContainingMapCalledEntry> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "entry" };
-    private static readonly uint[] _fieldTags = new uint[] { 10 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.MapUnittestProto3.Descriptor.MessageTypes[6]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.MapUnittestProto3.internal__static_protobuf_unittest_MessageContainingMapCalledEntry__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs
index 3875a4c3..517225b6 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs
@@ -12,9 +12,6 @@ namespace Google.Protobuf.TestProtos {
   [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
   public static partial class UnittestImportProto3 {
 
-    #region Static variables
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_import_ImportMessage__FieldAccessorTable;
-    #endregion
     #region Descriptor
     public static pbr::FileDescriptor Descriptor {
       get { return descriptor; }
@@ -31,14 +28,12 @@ namespace Google.Protobuf.TestProtos {
             "VU1fVU5TUEVDSUZJRUQQABIOCgpJTVBPUlRfRk9PEAcSDgoKSU1QT1JUX0JB", 
             "UhAIEg4KCklNUE9SVF9CQVoQCUI8Chhjb20uZ29vZ2xlLnByb3RvYnVmLnRl", 
             "c3RIAfgBAaoCGkdvb2dsZS5Qcm90b2J1Zi5UZXN0UHJvdG9zUABiBnByb3Rv", 
-          "Mw=="));
+            "Mw=="));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
-          new pbr::FileDescriptor[] {
-          global::Google.Protobuf.TestProtos.UnittestImportPublicProto3.Descriptor, 
-          });
-      internal__static_protobuf_unittest_import_ImportMessage__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.ImportMessage), descriptor.MessageTypes[0],
-              new string[] { "D", }, new string[] { });
+          new pbr::FileDescriptor[] { global::Google.Protobuf.TestProtos.UnittestImportPublicProto3.Descriptor, },
+          new pbr::GeneratedCodeInfo(new[] {typeof(global::Google.Protobuf.TestProtos.ImportEnum), }, new pbr::GeneratedCodeInfo[] {
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.ImportMessage), new[]{ "D" }, null, null, null)
+          }));
     }
     #endregion
 
@@ -59,14 +54,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<ImportMessage> _parser = new pb::MessageParser<ImportMessage>(() => new ImportMessage());
     public static pb::MessageParser<ImportMessage> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "d" };
-    private static readonly uint[] _fieldTags = new uint[] { 8 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestImportProto3.Descriptor.MessageTypes[0]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestImportProto3.internal__static_protobuf_unittest_import_ImportMessage__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs
index 048ae5e9..11ec29dd 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs
@@ -12,9 +12,6 @@ namespace Google.Protobuf.TestProtos {
   [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
   public static partial class UnittestImportPublicProto3 {
 
-    #region Static variables
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_import_PublicImportMessage__FieldAccessorTable;
-    #endregion
     #region Descriptor
     public static pbr::FileDescriptor Descriptor {
       get { return descriptor; }
@@ -27,13 +24,12 @@ namespace Google.Protobuf.TestProtos {
             "CjNnb29nbGUvcHJvdG9idWYvdW5pdHRlc3RfaW1wb3J0X3B1YmxpY19wcm90", 
             "bzMucHJvdG8SGHByb3RvYnVmX3VuaXR0ZXN0X2ltcG9ydCIgChNQdWJsaWNJ", 
             "bXBvcnRNZXNzYWdlEgkKAWUYASABKAVCNwoYY29tLmdvb2dsZS5wcm90b2J1", 
-          "Zi50ZXN0qgIaR29vZ2xlLlByb3RvYnVmLlRlc3RQcm90b3NiBnByb3RvMw=="));
+            "Zi50ZXN0qgIaR29vZ2xlLlByb3RvYnVmLlRlc3RQcm90b3NiBnByb3RvMw=="));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
-          new pbr::FileDescriptor[] {
-          });
-      internal__static_protobuf_unittest_import_PublicImportMessage__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.PublicImportMessage), descriptor.MessageTypes[0],
-              new string[] { "E", }, new string[] { });
+          new pbr::FileDescriptor[] { },
+          new pbr::GeneratedCodeInfo(null, new pbr::GeneratedCodeInfo[] {
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.PublicImportMessage), new[]{ "E" }, null, null, null)
+          }));
     }
     #endregion
 
@@ -44,14 +40,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<PublicImportMessage> _parser = new pb::MessageParser<PublicImportMessage>(() => new PublicImportMessage());
     public static pb::MessageParser<PublicImportMessage> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "e" };
-    private static readonly uint[] _fieldTags = new uint[] { 8 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestImportPublicProto3.Descriptor.MessageTypes[0]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestImportPublicProto3.internal__static_protobuf_unittest_import_PublicImportMessage__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs
index c68c67fb..07466650 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs
@@ -12,15 +12,6 @@ namespace UnitTest.Issues.TestProtos {
   [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
   public static partial class UnittestIssues {
 
-    #region Static variables
-    internal static pbr::FieldAccessorTable internal__static_unittest_issues_Issue307__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_unittest_issues_Issue307_NestedOnce__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_unittest_issues_Issue307_NestedOnce_NestedTwice__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_unittest_issues_NegativeEnumMessage__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_unittest_issues_DeprecatedChild__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_unittest_issues_DeprecatedFieldsMessage__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_unittest_issues_ItemField__FieldAccessorTable;
-    #endregion
     #region Descriptor
     public static pbr::FileDescriptor Descriptor {
       get { return descriptor; }
@@ -47,31 +38,16 @@ namespace UnitTest.Issues.TestProtos {
             "dGl2ZUVudW0SFgoSTkVHQVRJVkVfRU5VTV9aRVJPEAASFgoJRml2ZUJlbG93", 
             "EPv//////////wESFQoITWludXNPbmUQ////////////ASouCg5EZXByZWNh", 
             "dGVkRW51bRITCg9ERVBSRUNBVEVEX1pFUk8QABIHCgNvbmUQAUIfSAGqAhpV", 
-          "bml0VGVzdC5Jc3N1ZXMuVGVzdFByb3Rvc2IGcHJvdG8z"));
+            "bml0VGVzdC5Jc3N1ZXMuVGVzdFByb3Rvc2IGcHJvdG8z"));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
-          new pbr::FileDescriptor[] {
-          });
-      internal__static_unittest_issues_Issue307__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::UnitTest.Issues.TestProtos.Issue307), descriptor.MessageTypes[0],
-              new string[] { }, new string[] { });
-      internal__static_unittest_issues_Issue307_NestedOnce__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::UnitTest.Issues.TestProtos.Issue307.Types.NestedOnce), descriptor.MessageTypes[0].NestedTypes[0],
-              new string[] { }, new string[] { });
-      internal__static_unittest_issues_Issue307_NestedOnce_NestedTwice__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::UnitTest.Issues.TestProtos.Issue307.Types.NestedOnce.Types.NestedTwice), descriptor.MessageTypes[0].NestedTypes[0].NestedTypes[0],
-              new string[] { }, new string[] { });
-      internal__static_unittest_issues_NegativeEnumMessage__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::UnitTest.Issues.TestProtos.NegativeEnumMessage), descriptor.MessageTypes[1],
-              new string[] { "Value", "Values", "PackedValues", }, new string[] { });
-      internal__static_unittest_issues_DeprecatedChild__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::UnitTest.Issues.TestProtos.DeprecatedChild), descriptor.MessageTypes[2],
-              new string[] { }, new string[] { });
-      internal__static_unittest_issues_DeprecatedFieldsMessage__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::UnitTest.Issues.TestProtos.DeprecatedFieldsMessage), descriptor.MessageTypes[3],
-              new string[] { "PrimitiveValue", "PrimitiveArray", "MessageValue", "MessageArray", "EnumValue", "EnumArray", }, new string[] { });
-      internal__static_unittest_issues_ItemField__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::UnitTest.Issues.TestProtos.ItemField), descriptor.MessageTypes[4],
-              new string[] { "Item", }, new string[] { });
+          new pbr::FileDescriptor[] { },
+          new pbr::GeneratedCodeInfo(new[] {typeof(global::UnitTest.Issues.TestProtos.NegativeEnum), typeof(global::UnitTest.Issues.TestProtos.DeprecatedEnum), }, new pbr::GeneratedCodeInfo[] {
+            new pbr::GeneratedCodeInfo(typeof(global::UnitTest.Issues.TestProtos.Issue307), null, null, null, new pbr::GeneratedCodeInfo[] { new pbr::GeneratedCodeInfo(typeof(global::UnitTest.Issues.TestProtos.Issue307.Types.NestedOnce), null, null, null, new pbr::GeneratedCodeInfo[] { new pbr::GeneratedCodeInfo(typeof(global::UnitTest.Issues.TestProtos.Issue307.Types.NestedOnce.Types.NestedTwice), null, null, null, null)})}),
+            new pbr::GeneratedCodeInfo(typeof(global::UnitTest.Issues.TestProtos.NegativeEnumMessage), new[]{ "Value", "Values", "PackedValues" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::UnitTest.Issues.TestProtos.DeprecatedChild), null, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::UnitTest.Issues.TestProtos.DeprecatedFieldsMessage), new[]{ "PrimitiveValue", "PrimitiveArray", "MessageValue", "MessageArray", "EnumValue", "EnumArray" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::UnitTest.Issues.TestProtos.ItemField), new[]{ "Item" }, null, null, null)
+          }));
     }
     #endregion
 
@@ -96,14 +72,12 @@ namespace UnitTest.Issues.TestProtos {
     private static readonly pb::MessageParser<Issue307> _parser = new pb::MessageParser<Issue307>(() => new Issue307());
     public static pb::MessageParser<Issue307> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] {  };
-    private static readonly uint[] _fieldTags = new uint[] {  };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::UnitTest.Issues.TestProtos.UnittestIssues.Descriptor.MessageTypes[0]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::UnitTest.Issues.TestProtos.UnittestIssues.internal__static_unittest_issues_Issue307__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -189,14 +163,12 @@ namespace UnitTest.Issues.TestProtos {
         private static readonly pb::MessageParser<NestedOnce> _parser = new pb::MessageParser<NestedOnce>(() => new NestedOnce());
         public static pb::MessageParser<NestedOnce> Parser { get { return _parser; } }
 
-        private static readonly string[] _fieldNames = new string[] {  };
-        private static readonly uint[] _fieldTags = new uint[] {  };
         public static pbr::MessageDescriptor Descriptor {
           get { return global::UnitTest.Issues.TestProtos.Issue307.Descriptor.NestedTypes[0]; }
         }
 
-        pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-          get { return global::UnitTest.Issues.TestProtos.UnittestIssues.internal__static_unittest_issues_Issue307_NestedOnce__FieldAccessorTable; }
+        pbr::MessageDescriptor pb::IMessage.Descriptor {
+          get { return Descriptor; }
         }
 
         private bool _frozen = false;
@@ -282,14 +254,12 @@ namespace UnitTest.Issues.TestProtos {
             private static readonly pb::MessageParser<NestedTwice> _parser = new pb::MessageParser<NestedTwice>(() => new NestedTwice());
             public static pb::MessageParser<NestedTwice> Parser { get { return _parser; } }
 
-            private static readonly string[] _fieldNames = new string[] {  };
-            private static readonly uint[] _fieldTags = new uint[] {  };
             public static pbr::MessageDescriptor Descriptor {
               get { return global::UnitTest.Issues.TestProtos.Issue307.Types.NestedOnce.Descriptor.NestedTypes[0]; }
             }
 
-            pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-              get { return global::UnitTest.Issues.TestProtos.UnittestIssues.internal__static_unittest_issues_Issue307_NestedOnce_NestedTwice__FieldAccessorTable; }
+            pbr::MessageDescriptor pb::IMessage.Descriptor {
+              get { return Descriptor; }
             }
 
             private bool _frozen = false;
@@ -384,14 +354,12 @@ namespace UnitTest.Issues.TestProtos {
     private static readonly pb::MessageParser<NegativeEnumMessage> _parser = new pb::MessageParser<NegativeEnumMessage>(() => new NegativeEnumMessage());
     public static pb::MessageParser<NegativeEnumMessage> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "packed_values", "value", "values" };
-    private static readonly uint[] _fieldTags = new uint[] { 26, 8, 16 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::UnitTest.Issues.TestProtos.UnittestIssues.Descriptor.MessageTypes[1]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::UnitTest.Issues.TestProtos.UnittestIssues.internal__static_unittest_issues_NegativeEnumMessage__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -434,14 +402,16 @@ namespace UnitTest.Issues.TestProtos {
 
     public const int ValuesFieldNumber = 2;
     private static readonly pb::FieldCodec<global::UnitTest.Issues.TestProtos.NegativeEnum> _repeated_values_codec
-        = pb::FieldCodec.ForEnum(16, x => (int) x, x => (global::UnitTest.Issues.TestProtos.NegativeEnum) x);private readonly pbc::RepeatedField<global::UnitTest.Issues.TestProtos.NegativeEnum> values_ = new pbc::RepeatedField<global::UnitTest.Issues.TestProtos.NegativeEnum>();
+        = pb::FieldCodec.ForEnum(16, x => (int) x, x => (global::UnitTest.Issues.TestProtos.NegativeEnum) x);
+    private readonly pbc::RepeatedField<global::UnitTest.Issues.TestProtos.NegativeEnum> values_ = new pbc::RepeatedField<global::UnitTest.Issues.TestProtos.NegativeEnum>();
     public pbc::RepeatedField<global::UnitTest.Issues.TestProtos.NegativeEnum> Values {
       get { return values_; }
     }
 
     public const int PackedValuesFieldNumber = 3;
     private static readonly pb::FieldCodec<global::UnitTest.Issues.TestProtos.NegativeEnum> _repeated_packedValues_codec
-        = pb::FieldCodec.ForEnum(26, x => (int) x, x => (global::UnitTest.Issues.TestProtos.NegativeEnum) x);private readonly pbc::RepeatedField<global::UnitTest.Issues.TestProtos.NegativeEnum> packedValues_ = new pbc::RepeatedField<global::UnitTest.Issues.TestProtos.NegativeEnum>();
+        = pb::FieldCodec.ForEnum(26, x => (int) x, x => (global::UnitTest.Issues.TestProtos.NegativeEnum) x);
+    private readonly pbc::RepeatedField<global::UnitTest.Issues.TestProtos.NegativeEnum> packedValues_ = new pbc::RepeatedField<global::UnitTest.Issues.TestProtos.NegativeEnum>();
     public pbc::RepeatedField<global::UnitTest.Issues.TestProtos.NegativeEnum> PackedValues {
       get { return packedValues_; }
     }
@@ -541,14 +511,12 @@ namespace UnitTest.Issues.TestProtos {
     private static readonly pb::MessageParser<DeprecatedChild> _parser = new pb::MessageParser<DeprecatedChild>(() => new DeprecatedChild());
     public static pb::MessageParser<DeprecatedChild> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] {  };
-    private static readonly uint[] _fieldTags = new uint[] {  };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::UnitTest.Issues.TestProtos.UnittestIssues.Descriptor.MessageTypes[2]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::UnitTest.Issues.TestProtos.UnittestIssues.internal__static_unittest_issues_DeprecatedChild__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -633,14 +601,12 @@ namespace UnitTest.Issues.TestProtos {
     private static readonly pb::MessageParser<DeprecatedFieldsMessage> _parser = new pb::MessageParser<DeprecatedFieldsMessage>(() => new DeprecatedFieldsMessage());
     public static pb::MessageParser<DeprecatedFieldsMessage> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "EnumArray", "EnumValue", "MessageArray", "MessageValue", "PrimitiveArray", "PrimitiveValue" };
-    private static readonly uint[] _fieldTags = new uint[] { 50, 40, 34, 26, 18, 8 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::UnitTest.Issues.TestProtos.UnittestIssues.Descriptor.MessageTypes[3]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::UnitTest.Issues.TestProtos.UnittestIssues.internal__static_unittest_issues_DeprecatedFieldsMessage__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -729,7 +695,8 @@ namespace UnitTest.Issues.TestProtos {
 
     public const int EnumArrayFieldNumber = 6;
     private static readonly pb::FieldCodec<global::UnitTest.Issues.TestProtos.DeprecatedEnum> _repeated_enumArray_codec
-        = pb::FieldCodec.ForEnum(50, x => (int) x, x => (global::UnitTest.Issues.TestProtos.DeprecatedEnum) x);private readonly pbc::RepeatedField<global::UnitTest.Issues.TestProtos.DeprecatedEnum> enumArray_ = new pbc::RepeatedField<global::UnitTest.Issues.TestProtos.DeprecatedEnum>();
+        = pb::FieldCodec.ForEnum(50, x => (int) x, x => (global::UnitTest.Issues.TestProtos.DeprecatedEnum) x);
+    private readonly pbc::RepeatedField<global::UnitTest.Issues.TestProtos.DeprecatedEnum> enumArray_ = new pbc::RepeatedField<global::UnitTest.Issues.TestProtos.DeprecatedEnum>();
     [global::System.ObsoleteAttribute()]
     public pbc::RepeatedField<global::UnitTest.Issues.TestProtos.DeprecatedEnum> EnumArray {
       get { return enumArray_; }
@@ -877,14 +844,12 @@ namespace UnitTest.Issues.TestProtos {
     private static readonly pb::MessageParser<ItemField> _parser = new pb::MessageParser<ItemField>(() => new ItemField());
     public static pb::MessageParser<ItemField> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "item" };
-    private static readonly uint[] _fieldTags = new uint[] { 8 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::UnitTest.Issues.TestProtos.UnittestIssues.Descriptor.MessageTypes[4]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::UnitTest.Issues.TestProtos.UnittestIssues.internal__static_unittest_issues_ItemField__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs
index 67c42708..3d72c5a0 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs
@@ -12,43 +12,6 @@ namespace Google.Protobuf.TestProtos {
   [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
   public static partial class UnittestProto3 {
 
-    #region Static variables
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestAllTypes__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestAllTypes_NestedMessage__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_NestedTestAllTypes__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestDeprecatedFields__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_ForeignMessage__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestReservedFields__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestForeignNested__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestReallyLargeTagNumber__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestRecursiveMessage__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestMutualRecursionA__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestMutualRecursionB__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestCamelCaseFieldNames__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestFieldOrderings__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestFieldOrderings_NestedMessage__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_SparseEnumMessage__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_OneString__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_MoreString__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_OneBytes__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_MoreBytes__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_Int32Message__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_Uint32Message__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_Int64Message__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_Uint64Message__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_BoolMessage__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestOneof__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestPackedTypes__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestUnpackedTypes__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestRepeatedScalarDifferentTagSizes__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestCommentInjectionMessage__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_FooRequest__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_FooResponse__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_FooClientMessage__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_FooServerMessage__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_BarRequest__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_BarResponse__FieldAccessorTable;
-    #endregion
     #region Descriptor
     public static pbr::FileDescriptor Descriptor {
       get { return descriptor; }
@@ -184,116 +147,44 @@ namespace Google.Protobuf.TestProtos {
             "cXVlc3QaHi5wcm90b2J1Zl91bml0dGVzdC5Gb29SZXNwb25zZRJECgNCYXIS", 
             "HS5wcm90b2J1Zl91bml0dGVzdC5CYXJSZXF1ZXN0Gh4ucHJvdG9idWZfdW5p", 
             "dHRlc3QuQmFyUmVzcG9uc2VCOkINVW5pdHRlc3RQcm90b0gBgAEBiAEBkAEB", 
-          "+AEBqgIaR29vZ2xlLlByb3RvYnVmLlRlc3RQcm90b3NiBnByb3RvMw=="));
+            "+AEBqgIaR29vZ2xlLlByb3RvYnVmLlRlc3RQcm90b3NiBnByb3RvMw=="));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
-          new pbr::FileDescriptor[] {
-          global::Google.Protobuf.TestProtos.UnittestImportProto3.Descriptor, 
-          });
-      internal__static_protobuf_unittest_TestAllTypes__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestAllTypes), descriptor.MessageTypes[0],
-              new string[] { "SingleInt32", "SingleInt64", "SingleUint32", "SingleUint64", "SingleSint32", "SingleSint64", "SingleFixed32", "SingleFixed64", "SingleSfixed32", "SingleSfixed64", "SingleFloat", "SingleDouble", "SingleBool", "SingleString", "SingleBytes", "SingleNestedMessage", "SingleForeignMessage", "SingleImportMessage", "SingleNestedEnum", "SingleForeignEnum", "SingleImportEnum", "SinglePublicImportMessage", "RepeatedInt32", "RepeatedInt64", "RepeatedUint32", "RepeatedUint64", "RepeatedSint32", "RepeatedSint64", "RepeatedFixed32", "RepeatedFixed64", "RepeatedSfixed32", "RepeatedSfixed64", "RepeatedFloat", "RepeatedDouble", "RepeatedBool", "RepeatedString", "RepeatedBytes", "RepeatedNestedMessage", "RepeatedForeignMessage", "RepeatedImportMessage", "RepeatedNestedEnum", "RepeatedForeignEnum", "RepeatedImportEnum", "RepeatedPublicImportMessage", "OneofUint32", "OneofNestedMessage", "OneofString", "OneofBytes", }, new string[] { "OneofField", });
-      internal__static_protobuf_unittest_TestAllTypes_NestedMessage__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedMessage), descriptor.MessageTypes[0].NestedTypes[0],
-              new string[] { "Bb", }, new string[] { });
-      internal__static_protobuf_unittest_NestedTestAllTypes__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.NestedTestAllTypes), descriptor.MessageTypes[1],
-              new string[] { "Child", "Payload", "RepeatedChild", }, new string[] { });
-      internal__static_protobuf_unittest_TestDeprecatedFields__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestDeprecatedFields), descriptor.MessageTypes[2],
-              new string[] { "DeprecatedInt32", }, new string[] { });
-      internal__static_protobuf_unittest_ForeignMessage__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.ForeignMessage), descriptor.MessageTypes[3],
-              new string[] { "C", }, new string[] { });
-      internal__static_protobuf_unittest_TestReservedFields__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestReservedFields), descriptor.MessageTypes[4],
-              new string[] { }, new string[] { });
-      internal__static_protobuf_unittest_TestForeignNested__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestForeignNested), descriptor.MessageTypes[5],
-              new string[] { "ForeignNested", }, new string[] { });
-      internal__static_protobuf_unittest_TestReallyLargeTagNumber__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestReallyLargeTagNumber), descriptor.MessageTypes[6],
-              new string[] { "A", "Bb", }, new string[] { });
-      internal__static_protobuf_unittest_TestRecursiveMessage__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestRecursiveMessage), descriptor.MessageTypes[7],
-              new string[] { "A", "I", }, new string[] { });
-      internal__static_protobuf_unittest_TestMutualRecursionA__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMutualRecursionA), descriptor.MessageTypes[8],
-              new string[] { "Bb", }, new string[] { });
-      internal__static_protobuf_unittest_TestMutualRecursionB__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestMutualRecursionB), descriptor.MessageTypes[9],
-              new string[] { "A", "OptionalInt32", }, new string[] { });
-      internal__static_protobuf_unittest_TestCamelCaseFieldNames__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestCamelCaseFieldNames), descriptor.MessageTypes[10],
-              new string[] { "PrimitiveField", "StringField", "EnumField", "MessageField", "RepeatedPrimitiveField", "RepeatedStringField", "RepeatedEnumField", "RepeatedMessageField", }, new string[] { });
-      internal__static_protobuf_unittest_TestFieldOrderings__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestFieldOrderings), descriptor.MessageTypes[11],
-              new string[] { "MyString", "MyInt", "MyFloat", "SingleNestedMessage", }, new string[] { });
-      internal__static_protobuf_unittest_TestFieldOrderings_NestedMessage__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestFieldOrderings.Types.NestedMessage), descriptor.MessageTypes[11].NestedTypes[0],
-              new string[] { "Oo", "Bb", }, new string[] { });
-      internal__static_protobuf_unittest_SparseEnumMessage__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.SparseEnumMessage), descriptor.MessageTypes[12],
-              new string[] { "SparseEnum", }, new string[] { });
-      internal__static_protobuf_unittest_OneString__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.OneString), descriptor.MessageTypes[13],
-              new string[] { "Data", }, new string[] { });
-      internal__static_protobuf_unittest_MoreString__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.MoreString), descriptor.MessageTypes[14],
-              new string[] { "Data", }, new string[] { });
-      internal__static_protobuf_unittest_OneBytes__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.OneBytes), descriptor.MessageTypes[15],
-              new string[] { "Data", }, new string[] { });
-      internal__static_protobuf_unittest_MoreBytes__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.MoreBytes), descriptor.MessageTypes[16],
-              new string[] { "Data", }, new string[] { });
-      internal__static_protobuf_unittest_Int32Message__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.Int32Message), descriptor.MessageTypes[17],
-              new string[] { "Data", }, new string[] { });
-      internal__static_protobuf_unittest_Uint32Message__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.Uint32Message), descriptor.MessageTypes[18],
-              new string[] { "Data", }, new string[] { });
-      internal__static_protobuf_unittest_Int64Message__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.Int64Message), descriptor.MessageTypes[19],
-              new string[] { "Data", }, new string[] { });
-      internal__static_protobuf_unittest_Uint64Message__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.Uint64Message), descriptor.MessageTypes[20],
-              new string[] { "Data", }, new string[] { });
-      internal__static_protobuf_unittest_BoolMessage__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.BoolMessage), descriptor.MessageTypes[21],
-              new string[] { "Data", }, new string[] { });
-      internal__static_protobuf_unittest_TestOneof__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestOneof), descriptor.MessageTypes[22],
-              new string[] { "FooInt", "FooString", "FooMessage", }, new string[] { "Foo", });
-      internal__static_protobuf_unittest_TestPackedTypes__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestPackedTypes), descriptor.MessageTypes[23],
-              new string[] { "PackedInt32", "PackedInt64", "PackedUint32", "PackedUint64", "PackedSint32", "PackedSint64", "PackedFixed32", "PackedFixed64", "PackedSfixed32", "PackedSfixed64", "PackedFloat", "PackedDouble", "PackedBool", "PackedEnum", }, new string[] { });
-      internal__static_protobuf_unittest_TestUnpackedTypes__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestUnpackedTypes), descriptor.MessageTypes[24],
-              new string[] { "UnpackedInt32", "UnpackedInt64", "UnpackedUint32", "UnpackedUint64", "UnpackedSint32", "UnpackedSint64", "UnpackedFixed32", "UnpackedFixed64", "UnpackedSfixed32", "UnpackedSfixed64", "UnpackedFloat", "UnpackedDouble", "UnpackedBool", "UnpackedEnum", }, new string[] { });
-      internal__static_protobuf_unittest_TestRepeatedScalarDifferentTagSizes__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestRepeatedScalarDifferentTagSizes), descriptor.MessageTypes[25],
-              new string[] { "RepeatedFixed32", "RepeatedInt32", "RepeatedFixed64", "RepeatedInt64", "RepeatedFloat", "RepeatedUint64", }, new string[] { });
-      internal__static_protobuf_unittest_TestCommentInjectionMessage__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestCommentInjectionMessage), descriptor.MessageTypes[26],
-              new string[] { "A", }, new string[] { });
-      internal__static_protobuf_unittest_FooRequest__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.FooRequest), descriptor.MessageTypes[27],
-              new string[] { }, new string[] { });
-      internal__static_protobuf_unittest_FooResponse__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.FooResponse), descriptor.MessageTypes[28],
-              new string[] { }, new string[] { });
-      internal__static_protobuf_unittest_FooClientMessage__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.FooClientMessage), descriptor.MessageTypes[29],
-              new string[] { }, new string[] { });
-      internal__static_protobuf_unittest_FooServerMessage__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.FooServerMessage), descriptor.MessageTypes[30],
-              new string[] { }, new string[] { });
-      internal__static_protobuf_unittest_BarRequest__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.BarRequest), descriptor.MessageTypes[31],
-              new string[] { }, new string[] { });
-      internal__static_protobuf_unittest_BarResponse__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.BarResponse), descriptor.MessageTypes[32],
-              new string[] { }, new string[] { });
+          new pbr::FileDescriptor[] { global::Google.Protobuf.TestProtos.UnittestImportProto3.Descriptor, },
+          new pbr::GeneratedCodeInfo(new[] {typeof(global::Google.Protobuf.TestProtos.ForeignEnum), typeof(global::Google.Protobuf.TestProtos.TestEnumWithDupValue), typeof(global::Google.Protobuf.TestProtos.TestSparseEnum), }, new pbr::GeneratedCodeInfo[] {
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestAllTypes), new[]{ "SingleInt32", "SingleInt64", "SingleUint32", "SingleUint64", "SingleSint32", "SingleSint64", "SingleFixed32", "SingleFixed64", "SingleSfixed32", "SingleSfixed64", "SingleFloat", "SingleDouble", "SingleBool", "SingleString", "SingleBytes", "SingleNestedMessage", "SingleForeignMessage", "SingleImportMessage", "SingleNestedEnum", "SingleForeignEnum", "SingleImportEnum", "SinglePublicImportMessage", "RepeatedInt32", "RepeatedInt64", "RepeatedUint32", "RepeatedUint64", "RepeatedSint32", "RepeatedSint64", "RepeatedFixed32", "RepeatedFixed64", "RepeatedSfixed32", "RepeatedSfixed64", "RepeatedFloat", "RepeatedDouble", "RepeatedBool", "RepeatedString", "RepeatedBytes", "RepeatedNestedMessage", "RepeatedForeignMessage", "RepeatedImportMessage", "RepeatedNestedEnum", "RepeatedForeignEnum", "RepeatedImportEnum", "RepeatedPublicImportMessage", "OneofUint32", "OneofNestedMessage", "OneofString", "OneofBytes" }, new[]{ "OneofField" }, new[]{ typeof(global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedEnum) }, new pbr::GeneratedCodeInfo[] { new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedMessage), new[]{ "Bb" }, null, null, null)}),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.NestedTestAllTypes), new[]{ "Child", "Payload", "RepeatedChild" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestDeprecatedFields), new[]{ "DeprecatedInt32" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.ForeignMessage), new[]{ "C" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestReservedFields), null, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestForeignNested), new[]{ "ForeignNested" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestReallyLargeTagNumber), new[]{ "A", "Bb" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestRecursiveMessage), new[]{ "A", "I" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestMutualRecursionA), new[]{ "Bb" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestMutualRecursionB), new[]{ "A", "OptionalInt32" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestCamelCaseFieldNames), new[]{ "PrimitiveField", "StringField", "EnumField", "MessageField", "RepeatedPrimitiveField", "RepeatedStringField", "RepeatedEnumField", "RepeatedMessageField" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestFieldOrderings), new[]{ "MyString", "MyInt", "MyFloat", "SingleNestedMessage" }, null, null, new pbr::GeneratedCodeInfo[] { new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestFieldOrderings.Types.NestedMessage), new[]{ "Oo", "Bb" }, null, null, null)}),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.SparseEnumMessage), new[]{ "SparseEnum" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.OneString), new[]{ "Data" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.MoreString), new[]{ "Data" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.OneBytes), new[]{ "Data" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.MoreBytes), new[]{ "Data" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.Int32Message), new[]{ "Data" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.Uint32Message), new[]{ "Data" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.Int64Message), new[]{ "Data" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.Uint64Message), new[]{ "Data" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.BoolMessage), new[]{ "Data" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestOneof), new[]{ "FooInt", "FooString", "FooMessage" }, new[]{ "Foo" }, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestPackedTypes), new[]{ "PackedInt32", "PackedInt64", "PackedUint32", "PackedUint64", "PackedSint32", "PackedSint64", "PackedFixed32", "PackedFixed64", "PackedSfixed32", "PackedSfixed64", "PackedFloat", "PackedDouble", "PackedBool", "PackedEnum" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestUnpackedTypes), new[]{ "UnpackedInt32", "UnpackedInt64", "UnpackedUint32", "UnpackedUint64", "UnpackedSint32", "UnpackedSint64", "UnpackedFixed32", "UnpackedFixed64", "UnpackedSfixed32", "UnpackedSfixed64", "UnpackedFloat", "UnpackedDouble", "UnpackedBool", "UnpackedEnum" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestRepeatedScalarDifferentTagSizes), new[]{ "RepeatedFixed32", "RepeatedInt32", "RepeatedFixed64", "RepeatedInt64", "RepeatedFloat", "RepeatedUint64" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestCommentInjectionMessage), new[]{ "A" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.FooRequest), null, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.FooResponse), null, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.FooClientMessage), null, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.FooServerMessage), null, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.BarRequest), null, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.BarResponse), null, null, null, null)
+          }));
     }
     #endregion
 
@@ -333,14 +224,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestAllTypes> _parser = new pb::MessageParser<TestAllTypes>(() => new TestAllTypes());
     public static pb::MessageParser<TestAllTypes> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "oneof_bytes", "oneof_nested_message", "oneof_string", "oneof_uint32", "repeated_bool", "repeated_bytes", "repeated_double", "repeated_fixed32", "repeated_fixed64", "repeated_float", "repeated_foreign_enum", "repeated_foreign_message", "repeated_import_enum", "repeated_import_message", "repeated_int32", "repeated_int64", "repeated_nested_enum", "repeated_nested_message", "repeated_public_import_message", "repeated_sfixed32", "repeated_sfixed64", "repeated_sint32", "repeated_sint64", "repeated_string", "repeated_uint32", "repeated_uint64", "single_bool", "single_bytes", "single_double", "single_fixed32", "single_fixed64", "single_float", "single_foreign_enum", "single_foreign_message", "single_import_enum", "single_import_message", "single_int32", "single_int64", "single_nested_enum", "single_nested_message", "single_public_import_message", "single_sfixed32", "single_sfixed64", "single_sint32", "single_sint64", "single_string", "single_uint32", "single_uint64" };
-    private static readonly uint[] _fieldTags = new uint[] { 914, 898, 906, 888, 346, 362, 338, 298, 306, 330, 418, 394, 426, 402, 250, 258, 410, 386, 434, 314, 322, 282, 290, 354, 266, 274, 104, 122, 97, 61, 65, 93, 176, 154, 184, 162, 8, 16, 168, 146, 210, 77, 81, 40, 48, 114, 24, 32 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[0]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestAllTypes__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -818,21 +707,24 @@ namespace Google.Protobuf.TestProtos {
 
     public const int RepeatedNestedEnumFieldNumber = 51;
     private static readonly pb::FieldCodec<global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedEnum> _repeated_repeatedNestedEnum_codec
-        = pb::FieldCodec.ForEnum(410, x => (int) x, x => (global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedEnum) x);private readonly pbc::RepeatedField<global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedEnum> repeatedNestedEnum_ = new pbc::RepeatedField<global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedEnum>();
+        = pb::FieldCodec.ForEnum(410, x => (int) x, x => (global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedEnum) x);
+    private readonly pbc::RepeatedField<global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedEnum> repeatedNestedEnum_ = new pbc::RepeatedField<global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedEnum>();
     public pbc::RepeatedField<global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedEnum> RepeatedNestedEnum {
       get { return repeatedNestedEnum_; }
     }
 
     public const int RepeatedForeignEnumFieldNumber = 52;
     private static readonly pb::FieldCodec<global::Google.Protobuf.TestProtos.ForeignEnum> _repeated_repeatedForeignEnum_codec
-        = pb::FieldCodec.ForEnum(418, x => (int) x, x => (global::Google.Protobuf.TestProtos.ForeignEnum) x);private readonly pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum> repeatedForeignEnum_ = new pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum>();
+        = pb::FieldCodec.ForEnum(418, x => (int) x, x => (global::Google.Protobuf.TestProtos.ForeignEnum) x);
+    private readonly pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum> repeatedForeignEnum_ = new pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum>();
     public pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum> RepeatedForeignEnum {
       get { return repeatedForeignEnum_; }
     }
 
     public const int RepeatedImportEnumFieldNumber = 53;
     private static readonly pb::FieldCodec<global::Google.Protobuf.TestProtos.ImportEnum> _repeated_repeatedImportEnum_codec
-        = pb::FieldCodec.ForEnum(426, x => (int) x, x => (global::Google.Protobuf.TestProtos.ImportEnum) x);private readonly pbc::RepeatedField<global::Google.Protobuf.TestProtos.ImportEnum> repeatedImportEnum_ = new pbc::RepeatedField<global::Google.Protobuf.TestProtos.ImportEnum>();
+        = pb::FieldCodec.ForEnum(426, x => (int) x, x => (global::Google.Protobuf.TestProtos.ImportEnum) x);
+    private readonly pbc::RepeatedField<global::Google.Protobuf.TestProtos.ImportEnum> repeatedImportEnum_ = new pbc::RepeatedField<global::Google.Protobuf.TestProtos.ImportEnum>();
     public pbc::RepeatedField<global::Google.Protobuf.TestProtos.ImportEnum> RepeatedImportEnum {
       get { return repeatedImportEnum_; }
     }
@@ -1634,14 +1526,12 @@ namespace Google.Protobuf.TestProtos {
         private static readonly pb::MessageParser<NestedMessage> _parser = new pb::MessageParser<NestedMessage>(() => new NestedMessage());
         public static pb::MessageParser<NestedMessage> Parser { get { return _parser; } }
 
-        private static readonly string[] _fieldNames = new string[] { "bb" };
-        private static readonly uint[] _fieldTags = new uint[] { 8 };
         public static pbr::MessageDescriptor Descriptor {
           get { return global::Google.Protobuf.TestProtos.TestAllTypes.Descriptor.NestedTypes[0]; }
         }
 
-        pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-          get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestAllTypes_NestedMessage__FieldAccessorTable; }
+        pbr::MessageDescriptor pb::IMessage.Descriptor {
+          get { return Descriptor; }
         }
 
         private bool _frozen = false;
@@ -1758,14 +1648,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<NestedTestAllTypes> _parser = new pb::MessageParser<NestedTestAllTypes>(() => new NestedTestAllTypes());
     public static pb::MessageParser<NestedTestAllTypes> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "child", "payload", "repeated_child" };
-    private static readonly uint[] _fieldTags = new uint[] { 10, 18, 26 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[1]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_NestedTestAllTypes__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -1937,14 +1825,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestDeprecatedFields> _parser = new pb::MessageParser<TestDeprecatedFields>(() => new TestDeprecatedFields());
     public static pb::MessageParser<TestDeprecatedFields> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "deprecated_int32" };
-    private static readonly uint[] _fieldTags = new uint[] { 8 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[2]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestDeprecatedFields__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -2057,14 +1943,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<ForeignMessage> _parser = new pb::MessageParser<ForeignMessage>(() => new ForeignMessage());
     public static pb::MessageParser<ForeignMessage> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "c" };
-    private static readonly uint[] _fieldTags = new uint[] { 8 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[3]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_ForeignMessage__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -2176,14 +2060,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestReservedFields> _parser = new pb::MessageParser<TestReservedFields>(() => new TestReservedFields());
     public static pb::MessageParser<TestReservedFields> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] {  };
-    private static readonly uint[] _fieldTags = new uint[] {  };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[4]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestReservedFields__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -2268,14 +2150,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestForeignNested> _parser = new pb::MessageParser<TestForeignNested>(() => new TestForeignNested());
     public static pb::MessageParser<TestForeignNested> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "foreign_nested" };
-    private static readonly uint[] _fieldTags = new uint[] { 10 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[5]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestForeignNested__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -2394,14 +2274,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestReallyLargeTagNumber> _parser = new pb::MessageParser<TestReallyLargeTagNumber>(() => new TestReallyLargeTagNumber());
     public static pb::MessageParser<TestReallyLargeTagNumber> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "a", "bb" };
-    private static readonly uint[] _fieldTags = new uint[] { 8, 2147483640 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[6]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestReallyLargeTagNumber__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -2540,14 +2418,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestRecursiveMessage> _parser = new pb::MessageParser<TestRecursiveMessage>(() => new TestRecursiveMessage());
     public static pb::MessageParser<TestRecursiveMessage> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "a", "i" };
-    private static readonly uint[] _fieldTags = new uint[] { 10, 16 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[7]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestRecursiveMessage__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -2693,14 +2569,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestMutualRecursionA> _parser = new pb::MessageParser<TestMutualRecursionA>(() => new TestMutualRecursionA());
     public static pb::MessageParser<TestMutualRecursionA> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "bb" };
-    private static readonly uint[] _fieldTags = new uint[] { 10 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[8]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestMutualRecursionA__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -2819,14 +2693,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestMutualRecursionB> _parser = new pb::MessageParser<TestMutualRecursionB>(() => new TestMutualRecursionB());
     public static pb::MessageParser<TestMutualRecursionB> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "a", "optional_int32" };
-    private static readonly uint[] _fieldTags = new uint[] { 10, 16 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[9]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestMutualRecursionB__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -2972,14 +2844,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestCamelCaseFieldNames> _parser = new pb::MessageParser<TestCamelCaseFieldNames>(() => new TestCamelCaseFieldNames());
     public static pb::MessageParser<TestCamelCaseFieldNames> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "EnumField", "MessageField", "PrimitiveField", "RepeatedEnumField", "RepeatedMessageField", "RepeatedPrimitiveField", "RepeatedStringField", "StringField" };
-    private static readonly uint[] _fieldTags = new uint[] { 24, 34, 8, 74, 82, 58, 66, 18 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[10]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestCamelCaseFieldNames__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -3076,7 +2946,8 @@ namespace Google.Protobuf.TestProtos {
 
     public const int RepeatedEnumFieldFieldNumber = 9;
     private static readonly pb::FieldCodec<global::Google.Protobuf.TestProtos.ForeignEnum> _repeated_repeatedEnumField_codec
-        = pb::FieldCodec.ForEnum(74, x => (int) x, x => (global::Google.Protobuf.TestProtos.ForeignEnum) x);private readonly pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum> repeatedEnumField_ = new pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum>();
+        = pb::FieldCodec.ForEnum(74, x => (int) x, x => (global::Google.Protobuf.TestProtos.ForeignEnum) x);
+    private readonly pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum> repeatedEnumField_ = new pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum>();
     public pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum> RepeatedEnumField {
       get { return repeatedEnumField_; }
     }
@@ -3256,14 +3127,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestFieldOrderings> _parser = new pb::MessageParser<TestFieldOrderings>(() => new TestFieldOrderings());
     public static pb::MessageParser<TestFieldOrderings> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "my_float", "my_int", "my_string", "single_nested_message" };
-    private static readonly uint[] _fieldTags = new uint[] { 813, 8, 90, 1602 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[11]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestFieldOrderings__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -3464,14 +3333,12 @@ namespace Google.Protobuf.TestProtos {
         private static readonly pb::MessageParser<NestedMessage> _parser = new pb::MessageParser<NestedMessage>(() => new NestedMessage());
         public static pb::MessageParser<NestedMessage> Parser { get { return _parser; } }
 
-        private static readonly string[] _fieldNames = new string[] { "bb", "oo" };
-        private static readonly uint[] _fieldTags = new uint[] { 8, 16 };
         public static pbr::MessageDescriptor Descriptor {
           get { return global::Google.Protobuf.TestProtos.TestFieldOrderings.Descriptor.NestedTypes[0]; }
         }
 
-        pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-          get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestFieldOrderings_NestedMessage__FieldAccessorTable; }
+        pbr::MessageDescriptor pb::IMessage.Descriptor {
+          get { return Descriptor; }
         }
 
         private bool _frozen = false;
@@ -3615,14 +3482,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<SparseEnumMessage> _parser = new pb::MessageParser<SparseEnumMessage>(() => new SparseEnumMessage());
     public static pb::MessageParser<SparseEnumMessage> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "sparse_enum" };
-    private static readonly uint[] _fieldTags = new uint[] { 8 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[12]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_SparseEnumMessage__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -3734,14 +3599,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<OneString> _parser = new pb::MessageParser<OneString>(() => new OneString());
     public static pb::MessageParser<OneString> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "data" };
-    private static readonly uint[] _fieldTags = new uint[] { 10 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[13]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_OneString__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -3853,14 +3716,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<MoreString> _parser = new pb::MessageParser<MoreString>(() => new MoreString());
     public static pb::MessageParser<MoreString> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "data" };
-    private static readonly uint[] _fieldTags = new uint[] { 10 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[14]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_MoreString__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -3964,14 +3825,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<OneBytes> _parser = new pb::MessageParser<OneBytes>(() => new OneBytes());
     public static pb::MessageParser<OneBytes> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "data" };
-    private static readonly uint[] _fieldTags = new uint[] { 10 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[15]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_OneBytes__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -4083,14 +3942,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<MoreBytes> _parser = new pb::MessageParser<MoreBytes>(() => new MoreBytes());
     public static pb::MessageParser<MoreBytes> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "data" };
-    private static readonly uint[] _fieldTags = new uint[] { 10 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[16]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_MoreBytes__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -4202,14 +4059,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<Int32Message> _parser = new pb::MessageParser<Int32Message>(() => new Int32Message());
     public static pb::MessageParser<Int32Message> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "data" };
-    private static readonly uint[] _fieldTags = new uint[] { 8 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[17]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_Int32Message__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -4321,14 +4176,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<Uint32Message> _parser = new pb::MessageParser<Uint32Message>(() => new Uint32Message());
     public static pb::MessageParser<Uint32Message> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "data" };
-    private static readonly uint[] _fieldTags = new uint[] { 8 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[18]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_Uint32Message__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -4440,14 +4293,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<Int64Message> _parser = new pb::MessageParser<Int64Message>(() => new Int64Message());
     public static pb::MessageParser<Int64Message> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "data" };
-    private static readonly uint[] _fieldTags = new uint[] { 8 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[19]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_Int64Message__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -4559,14 +4410,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<Uint64Message> _parser = new pb::MessageParser<Uint64Message>(() => new Uint64Message());
     public static pb::MessageParser<Uint64Message> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "data" };
-    private static readonly uint[] _fieldTags = new uint[] { 8 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[20]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_Uint64Message__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -4678,14 +4527,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<BoolMessage> _parser = new pb::MessageParser<BoolMessage>(() => new BoolMessage());
     public static pb::MessageParser<BoolMessage> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "data" };
-    private static readonly uint[] _fieldTags = new uint[] { 8 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[21]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_BoolMessage__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -4797,14 +4644,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestOneof> _parser = new pb::MessageParser<TestOneof>(() => new TestOneof());
     public static pb::MessageParser<TestOneof> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "foo_int", "foo_message", "foo_string" };
-    private static readonly uint[] _fieldTags = new uint[] { 8, 26, 18 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[22]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestOneof__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -5006,14 +4851,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestPackedTypes> _parser = new pb::MessageParser<TestPackedTypes>(() => new TestPackedTypes());
     public static pb::MessageParser<TestPackedTypes> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "packed_bool", "packed_double", "packed_enum", "packed_fixed32", "packed_fixed64", "packed_float", "packed_int32", "packed_int64", "packed_sfixed32", "packed_sfixed64", "packed_sint32", "packed_sint64", "packed_uint32", "packed_uint64" };
-    private static readonly uint[] _fieldTags = new uint[] { 818, 810, 826, 770, 778, 802, 722, 730, 786, 794, 754, 762, 738, 746 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[23]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestPackedTypes__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -5173,7 +5016,8 @@ namespace Google.Protobuf.TestProtos {
 
     public const int PackedEnumFieldNumber = 103;
     private static readonly pb::FieldCodec<global::Google.Protobuf.TestProtos.ForeignEnum> _repeated_packedEnum_codec
-        = pb::FieldCodec.ForEnum(826, x => (int) x, x => (global::Google.Protobuf.TestProtos.ForeignEnum) x);private readonly pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum> packedEnum_ = new pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum>();
+        = pb::FieldCodec.ForEnum(826, x => (int) x, x => (global::Google.Protobuf.TestProtos.ForeignEnum) x);
+    private readonly pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum> packedEnum_ = new pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum>();
     public pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum> PackedEnum {
       get { return packedEnum_; }
     }
@@ -5377,14 +5221,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestUnpackedTypes> _parser = new pb::MessageParser<TestUnpackedTypes>(() => new TestUnpackedTypes());
     public static pb::MessageParser<TestUnpackedTypes> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "unpacked_bool", "unpacked_double", "unpacked_enum", "unpacked_fixed32", "unpacked_fixed64", "unpacked_float", "unpacked_int32", "unpacked_int64", "unpacked_sfixed32", "unpacked_sfixed64", "unpacked_sint32", "unpacked_sint64", "unpacked_uint32", "unpacked_uint64" };
-    private static readonly uint[] _fieldTags = new uint[] { 816, 809, 824, 773, 777, 805, 720, 728, 789, 793, 752, 760, 736, 744 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[24]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestUnpackedTypes__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -5544,7 +5386,8 @@ namespace Google.Protobuf.TestProtos {
 
     public const int UnpackedEnumFieldNumber = 103;
     private static readonly pb::FieldCodec<global::Google.Protobuf.TestProtos.ForeignEnum> _repeated_unpackedEnum_codec
-        = pb::FieldCodec.ForEnum(824, x => (int) x, x => (global::Google.Protobuf.TestProtos.ForeignEnum) x);private readonly pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum> unpackedEnum_ = new pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum>();
+        = pb::FieldCodec.ForEnum(824, x => (int) x, x => (global::Google.Protobuf.TestProtos.ForeignEnum) x);
+    private readonly pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum> unpackedEnum_ = new pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum>();
     public pbc::RepeatedField<global::Google.Protobuf.TestProtos.ForeignEnum> UnpackedEnum {
       get { return unpackedEnum_; }
     }
@@ -5748,14 +5591,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestRepeatedScalarDifferentTagSizes> _parser = new pb::MessageParser<TestRepeatedScalarDifferentTagSizes>(() => new TestRepeatedScalarDifferentTagSizes());
     public static pb::MessageParser<TestRepeatedScalarDifferentTagSizes> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "repeated_fixed32", "repeated_fixed64", "repeated_float", "repeated_int32", "repeated_int64", "repeated_uint64" };
-    private static readonly uint[] _fieldTags = new uint[] { 98, 16370, 2097138, 106, 16378, 2097146 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[25]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestRepeatedScalarDifferentTagSizes__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -5960,14 +5801,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestCommentInjectionMessage> _parser = new pb::MessageParser<TestCommentInjectionMessage>(() => new TestCommentInjectionMessage());
     public static pb::MessageParser<TestCommentInjectionMessage> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "a" };
-    private static readonly uint[] _fieldTags = new uint[] { 10 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[26]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_TestCommentInjectionMessage__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -6079,14 +5918,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<FooRequest> _parser = new pb::MessageParser<FooRequest>(() => new FooRequest());
     public static pb::MessageParser<FooRequest> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] {  };
-    private static readonly uint[] _fieldTags = new uint[] {  };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[27]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_FooRequest__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -6171,14 +6008,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<FooResponse> _parser = new pb::MessageParser<FooResponse>(() => new FooResponse());
     public static pb::MessageParser<FooResponse> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] {  };
-    private static readonly uint[] _fieldTags = new uint[] {  };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[28]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_FooResponse__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -6263,14 +6098,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<FooClientMessage> _parser = new pb::MessageParser<FooClientMessage>(() => new FooClientMessage());
     public static pb::MessageParser<FooClientMessage> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] {  };
-    private static readonly uint[] _fieldTags = new uint[] {  };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[29]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_FooClientMessage__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -6355,14 +6188,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<FooServerMessage> _parser = new pb::MessageParser<FooServerMessage>(() => new FooServerMessage());
     public static pb::MessageParser<FooServerMessage> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] {  };
-    private static readonly uint[] _fieldTags = new uint[] {  };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[30]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_FooServerMessage__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -6447,14 +6278,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<BarRequest> _parser = new pb::MessageParser<BarRequest>(() => new BarRequest());
     public static pb::MessageParser<BarRequest> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] {  };
-    private static readonly uint[] _fieldTags = new uint[] {  };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[31]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_BarRequest__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -6539,14 +6368,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<BarResponse> _parser = new pb::MessageParser<BarResponse>(() => new BarResponse());
     public static pb::MessageParser<BarResponse> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] {  };
-    private static readonly uint[] _fieldTags = new uint[] {  };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor.MessageTypes[32]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestProto3.internal__static_protobuf_unittest_BarResponse__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs
index af7d83ba..d9943dba 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs
@@ -12,12 +12,6 @@ namespace Google.Protobuf.TestProtos {
   [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
   public static partial class UnittestWellKnownTypes {
 
-    #region Static variables
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_TestWellKnownTypes__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_RepeatedWellKnownTypes__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_OneofWellKnownTypes__FieldAccessorTable;
-    internal static pbr::FieldAccessorTable internal__static_protobuf_unittest_MapWellKnownTypes__FieldAccessorTable;
-    #endregion
     #region Descriptor
     public static pbr::FileDescriptor Descriptor {
       get { return descriptor; }
@@ -162,32 +156,15 @@ namespace Google.Protobuf.TestProtos {
             "AjgBGk4KD0J5dGVzRmllbGRFbnRyeRILCgNrZXkYASABKAUSKgoFdmFsdWUY", 
             "AiABKAsyGy5nb29nbGUucHJvdG9idWYuQnl0ZXNWYWx1ZToCOAFCOQoYY29t", 
             "Lmdvb2dsZS5wcm90b2J1Zi50ZXN0UAGqAhpHb29nbGUuUHJvdG9idWYuVGVz", 
-          "dFByb3Rvc2IGcHJvdG8z"));
+            "dFByb3Rvc2IGcHJvdG8z"));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
-          new pbr::FileDescriptor[] {
-          global::Google.Protobuf.WellKnownTypes.Proto.Any.Descriptor, 
-          global::Google.Protobuf.WellKnownTypes.Proto.Api.Descriptor, 
-          global::Google.Protobuf.WellKnownTypes.Proto.Duration.Descriptor, 
-          global::Google.Protobuf.WellKnownTypes.Proto.Empty.Descriptor, 
-          global::Google.Protobuf.WellKnownTypes.Proto.FieldMask.Descriptor, 
-          global::Google.Protobuf.WellKnownTypes.Proto.SourceContext.Descriptor, 
-          global::Google.Protobuf.WellKnownTypes.Proto.Struct.Descriptor, 
-          global::Google.Protobuf.WellKnownTypes.Proto.Timestamp.Descriptor, 
-          global::Google.Protobuf.WellKnownTypes.Proto.Type.Descriptor, 
-          global::Google.Protobuf.WellKnownTypes.Wrappers.Descriptor, 
-          });
-      internal__static_protobuf_unittest_TestWellKnownTypes__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.TestWellKnownTypes), descriptor.MessageTypes[0],
-              new string[] { "AnyField", "ApiField", "DurationField", "EmptyField", "FieldMaskField", "SourceContextField", "StructField", "TimestampField", "TypeField", "DoubleField", "FloatField", "Int64Field", "Uint64Field", "Int32Field", "Uint32Field", "BoolField", "StringField", "BytesField", }, new string[] { });
-      internal__static_protobuf_unittest_RepeatedWellKnownTypes__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.RepeatedWellKnownTypes), descriptor.MessageTypes[1],
-              new string[] { "AnyField", "ApiField", "DurationField", "EmptyField", "FieldMaskField", "SourceContextField", "StructField", "TimestampField", "TypeField", "DoubleField", "FloatField", "Int64Field", "Uint64Field", "Int32Field", "Uint32Field", "BoolField", "StringField", "BytesField", }, new string[] { });
-      internal__static_protobuf_unittest_OneofWellKnownTypes__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.OneofWellKnownTypes), descriptor.MessageTypes[2],
-              new string[] { "AnyField", "ApiField", "DurationField", "EmptyField", "FieldMaskField", "SourceContextField", "StructField", "TimestampField", "TypeField", "DoubleField", "FloatField", "Int64Field", "Uint64Field", "Int32Field", "Uint32Field", "BoolField", "StringField", "BytesField", }, new string[] { "OneofField", });
-      internal__static_protobuf_unittest_MapWellKnownTypes__FieldAccessorTable = 
-          new pbr::FieldAccessorTable(typeof(global::Google.Protobuf.TestProtos.MapWellKnownTypes), descriptor.MessageTypes[3],
-              new string[] { "AnyField", "ApiField", "DurationField", "EmptyField", "FieldMaskField", "SourceContextField", "StructField", "TimestampField", "TypeField", "DoubleField", "FloatField", "Int64Field", "Uint64Field", "Int32Field", "Uint32Field", "BoolField", "StringField", "BytesField", }, new string[] { });
+          new pbr::FileDescriptor[] { global::Google.Protobuf.WellKnownTypes.Proto.Any.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.Api.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.Duration.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.Empty.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.FieldMask.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.SourceContext.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.Struct.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.Timestamp.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.Type.Descriptor, global::Google.Protobuf.WellKnownTypes.Wrappers.Descriptor, },
+          new pbr::GeneratedCodeInfo(null, new pbr::GeneratedCodeInfo[] {
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.TestWellKnownTypes), new[]{ "AnyField", "ApiField", "DurationField", "EmptyField", "FieldMaskField", "SourceContextField", "StructField", "TimestampField", "TypeField", "DoubleField", "FloatField", "Int64Field", "Uint64Field", "Int32Field", "Uint32Field", "BoolField", "StringField", "BytesField" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.RepeatedWellKnownTypes), new[]{ "AnyField", "ApiField", "DurationField", "EmptyField", "FieldMaskField", "SourceContextField", "StructField", "TimestampField", "TypeField", "DoubleField", "FloatField", "Int64Field", "Uint64Field", "Int32Field", "Uint32Field", "BoolField", "StringField", "BytesField" }, null, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.OneofWellKnownTypes), new[]{ "AnyField", "ApiField", "DurationField", "EmptyField", "FieldMaskField", "SourceContextField", "StructField", "TimestampField", "TypeField", "DoubleField", "FloatField", "Int64Field", "Uint64Field", "Int32Field", "Uint32Field", "BoolField", "StringField", "BytesField" }, new[]{ "OneofField" }, null, null),
+            new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.TestProtos.MapWellKnownTypes), new[]{ "AnyField", "ApiField", "DurationField", "EmptyField", "FieldMaskField", "SourceContextField", "StructField", "TimestampField", "TypeField", "DoubleField", "FloatField", "Int64Field", "Uint64Field", "Int32Field", "Uint32Field", "BoolField", "StringField", "BytesField" }, null, null, new pbr::GeneratedCodeInfo[] { null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, })
+          }));
     }
     #endregion
 
@@ -198,14 +175,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<TestWellKnownTypes> _parser = new pb::MessageParser<TestWellKnownTypes>(() => new TestWellKnownTypes());
     public static pb::MessageParser<TestWellKnownTypes> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "any_field", "api_field", "bool_field", "bytes_field", "double_field", "duration_field", "empty_field", "field_mask_field", "float_field", "int32_field", "int64_field", "source_context_field", "string_field", "struct_field", "timestamp_field", "type_field", "uint32_field", "uint64_field" };
-    private static readonly uint[] _fieldTags = new uint[] { 10, 18, 130, 146, 82, 26, 34, 42, 90, 114, 98, 50, 138, 58, 66, 74, 122, 106 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestWellKnownTypes.Descriptor.MessageTypes[0]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestWellKnownTypes.internal__static_protobuf_unittest_TestWellKnownTypes__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -884,14 +859,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<RepeatedWellKnownTypes> _parser = new pb::MessageParser<RepeatedWellKnownTypes>(() => new RepeatedWellKnownTypes());
     public static pb::MessageParser<RepeatedWellKnownTypes> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "any_field", "api_field", "bool_field", "bytes_field", "double_field", "duration_field", "empty_field", "field_mask_field", "float_field", "int32_field", "int64_field", "source_context_field", "string_field", "struct_field", "timestamp_field", "type_field", "uint32_field", "uint64_field" };
-    private static readonly uint[] _fieldTags = new uint[] { 10, 18, 130, 146, 82, 26, 34, 42, 90, 114, 98, 50, 138, 58, 66, 74, 122, 106 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestWellKnownTypes.Descriptor.MessageTypes[1]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestWellKnownTypes.internal__static_protobuf_unittest_RepeatedWellKnownTypes__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -1318,14 +1291,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<OneofWellKnownTypes> _parser = new pb::MessageParser<OneofWellKnownTypes>(() => new OneofWellKnownTypes());
     public static pb::MessageParser<OneofWellKnownTypes> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "any_field", "api_field", "bool_field", "bytes_field", "double_field", "duration_field", "empty_field", "field_mask_field", "float_field", "int32_field", "int64_field", "source_context_field", "string_field", "struct_field", "timestamp_field", "type_field", "uint32_field", "uint64_field" };
-    private static readonly uint[] _fieldTags = new uint[] { 10, 18, 130, 146, 82, 26, 34, 42, 90, 114, 98, 50, 138, 58, 66, 74, 122, 106 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestWellKnownTypes.Descriptor.MessageTypes[2]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestWellKnownTypes.internal__static_protobuf_unittest_OneofWellKnownTypes__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
@@ -2017,14 +1988,12 @@ namespace Google.Protobuf.TestProtos {
     private static readonly pb::MessageParser<MapWellKnownTypes> _parser = new pb::MessageParser<MapWellKnownTypes>(() => new MapWellKnownTypes());
     public static pb::MessageParser<MapWellKnownTypes> Parser { get { return _parser; } }
 
-    private static readonly string[] _fieldNames = new string[] { "any_field", "api_field", "bool_field", "bytes_field", "double_field", "duration_field", "empty_field", "field_mask_field", "float_field", "int32_field", "int64_field", "source_context_field", "string_field", "struct_field", "timestamp_field", "type_field", "uint32_field", "uint64_field" };
-    private static readonly uint[] _fieldTags = new uint[] { 10, 18, 130, 146, 82, 26, 34, 42, 90, 114, 98, 50, 138, 58, 66, 74, 122, 106 };
     public static pbr::MessageDescriptor Descriptor {
       get { return global::Google.Protobuf.TestProtos.UnittestWellKnownTypes.Descriptor.MessageTypes[3]; }
     }
 
-    pbr::FieldAccessorTable pb::IReflectedMessage.Fields {
-      get { return global::Google.Protobuf.TestProtos.UnittestWellKnownTypes.internal__static_protobuf_unittest_MapWellKnownTypes__FieldAccessorTable; }
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
     }
 
     private bool _frozen = false;
diff --git a/csharp/src/Google.Protobuf.Test/WellKnownTypes/WrappersTest.cs b/csharp/src/Google.Protobuf.Test/WellKnownTypes/WrappersTest.cs
index ad88c4eb..c617db36 100644
--- a/csharp/src/Google.Protobuf.Test/WellKnownTypes/WrappersTest.cs
+++ b/csharp/src/Google.Protobuf.Test/WellKnownTypes/WrappersTest.cs
@@ -192,7 +192,7 @@ namespace Google.Protobuf.WellKnownTypes
                 Uint32Field = 3,
                 Uint64Field = 4
             };
-            var fields = ((IReflectedMessage) message).Fields;
+            var fields = TestWellKnownTypes.Descriptor.FieldAccessorsByFieldNumber;
 
             Assert.AreEqual("x", fields[TestWellKnownTypes.StringFieldFieldNumber].GetValue(message));
             Assert.AreEqual(ByteString.CopyFrom(1, 2, 3), fields[TestWellKnownTypes.BytesFieldFieldNumber].GetValue(message));
@@ -216,7 +216,7 @@ namespace Google.Protobuf.WellKnownTypes
         {
             // Just a single example... note that we can't have a null value here
             var message = new RepeatedWellKnownTypes { Int32Field = { 1, 2 } };
-            var fields = ((IReflectedMessage) message).Fields;
+            var fields = RepeatedWellKnownTypes.Descriptor.FieldAccessorsByFieldNumber;
             var list = (IList) fields[RepeatedWellKnownTypes.Int32FieldFieldNumber].GetValue(message);
             CollectionAssert.AreEqual(new[] { 1, 2 }, list);
         }
@@ -226,7 +226,7 @@ namespace Google.Protobuf.WellKnownTypes
         {
             // Just a single example... note that we can't have a null value here
             var message = new MapWellKnownTypes { Int32Field = { { 1, 2 }, { 3, null } } };
-            var fields = ((IReflectedMessage) message).Fields;
+            var fields = MapWellKnownTypes.Descriptor.FieldAccessorsByFieldNumber;
             var dictionary = (IDictionary) fields[MapWellKnownTypes.Int32FieldFieldNumber].GetValue(message);
             Assert.AreEqual(2, dictionary[1]);
             Assert.IsNull(dictionary[3]);