Shrink ObjC overhead (generated size and some runtime sizes)

NOTE: This is a binary breaking change as structure sizes have changed size
and/or order.

- Drop capturing field options, no other options were captured and other mobile
  targeted languages don't try to capture this sort information (saved 8
  bytes for every field defined (in static data and again in field descriptor
  instance size data).
- No longer generate/compile in the messages/enums in descriptor.proto. If
  developers need it, they should generate it and compile it in. Reduced the
  overhead of the core library.
- Compute the number of has_bits actually needs to avoid over reserving.
- Let the boolean single fields store via a has_bit to avoid storage, makes
  the common cases of the instance size smaller.
- Reorder some flags and down size the enums to contain the bits needed.
- Reorder the items in the structures to manually ensure they are are packed
  better (especially when generating 64bit code - 8 bytes for every field,
  16 bytes for every extension, instance sizes 8 bytes also).
- Split off the structure initialization so when the default is zero, the
  generated static storage doesn't need to reserve the space. This is batched
  at the message level, so all the fields for the message have to have zero
  defaults to get the saves. By definition all proto3 syntax  files fall into
  this case but it also saves space for the proto2 that use the standard
  defaults. (saves 8 bytes of static data for every field that had a zero
  default)
- Don't track the enums defined by a message. Nothing in the runtime needs it
  and it was just generation and runtime overhead. (saves 8 bytes per enum)
- Ensure EnumDescriptors are started up threadsafe in all cases.
- Split some of the Descriptor initialization into multiple methods so the
  generated code isn't padded with lots of zero/nil args.
- Change how oneof info is feed to the runtime enabling us to generate less
  static data (8 bytes saved per oneof for 64bit).
- Change how enum value informat is capture to pack the data and only decode
  it if it ends up being needed. Avoids padding issues causing bloat of 64bit,
  and removes the needs for extra pointers in addition to the data (just the
  data and one pointer now).
diff --git a/Makefile.am b/Makefile.am
index 064efdf..4b5a44f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -381,13 +381,11 @@
   objectivec/DevTools/full_mac_build.sh                                      \
   objectivec/DevTools/pddm.py                                                \
   objectivec/DevTools/pddm_tests.py                                          \
-  objectivec/generate_descriptors_proto.sh                                   \
+  objectivec/generate_well_known_types.sh                                    \
   objectivec/google/protobuf/Any.pbobjc.h                                    \
   objectivec/google/protobuf/Any.pbobjc.m                                    \
   objectivec/google/protobuf/Api.pbobjc.h                                    \
   objectivec/google/protobuf/Api.pbobjc.m                                    \
-  objectivec/google/protobuf/Descriptor.pbobjc.h                             \
-  objectivec/google/protobuf/Descriptor.pbobjc.m                             \
   objectivec/google/protobuf/Duration.pbobjc.h                               \
   objectivec/google/protobuf/Duration.pbobjc.m                               \
   objectivec/google/protobuf/Empty.pbobjc.h                                  \
diff --git a/Protobuf.podspec b/Protobuf.podspec
index 02c8372..0bbd06d 100644
--- a/Protobuf.podspec
+++ b/Protobuf.podspec
@@ -17,7 +17,6 @@
   s.source_files = 'objectivec/*.{h,m}',
                    'objectivec/google/protobuf/Any.pbobjc.{h,m}',
                    'objectivec/google/protobuf/Api.pbobjc.{h,m}',
-                   'objectivec/google/protobuf/Descriptor.pbobjc.{h,m}',
                    'objectivec/google/protobuf/Duration.pbobjc.h',
                    'objectivec/google/protobuf/Empty.pbobjc.{h,m}',
                    'objectivec/google/protobuf/FieldMask.pbobjc.{h,m}',
diff --git a/generate_descriptor_proto.sh b/generate_descriptor_proto.sh
index 81b8a0d..1690d0d 100755
--- a/generate_descriptor_proto.sh
+++ b/generate_descriptor_proto.sh
@@ -92,9 +92,9 @@
 done
 cd ..
 
-if test -x objectivec/generate_descriptors_proto.sh; then
+if test -x objectivec/generate_well_known_types.sh; then
   echo "Generating messages for objc."
-  objectivec/generate_descriptors_proto.sh $@
+  objectivec/generate_well_known_types.sh $@
 fi
 
 if test -x csharp/generate_protos.sh; then
diff --git a/objectivec/DevTools/compile_testing_protos.sh b/objectivec/DevTools/compile_testing_protos.sh
index e9c5fe6..8295313 100755
--- a/objectivec/DevTools/compile_testing_protos.sh
+++ b/objectivec/DevTools/compile_testing_protos.sh
@@ -67,29 +67,36 @@
 # Ensure the output dir exists
 mkdir -p "${OUTPUT_DIR}/google/protobuf"
 
-CORE_PROTO_FILES=(                                         \
-  src/google/protobuf/unittest_arena.proto                 \
-  src/google/protobuf/unittest_custom_options.proto        \
-  src/google/protobuf/unittest_enormous_descriptor.proto   \
-  src/google/protobuf/unittest_embed_optimize_for.proto    \
-  src/google/protobuf/unittest_empty.proto                 \
-  src/google/protobuf/unittest_import.proto                \
-  src/google/protobuf/unittest_import_lite.proto           \
-  src/google/protobuf/unittest_lite.proto                  \
-  src/google/protobuf/unittest_mset.proto                  \
-  src/google/protobuf/unittest_mset_wire_format.proto      \
-  src/google/protobuf/unittest_no_arena.proto              \
-  src/google/protobuf/unittest_no_arena_import.proto       \
-  src/google/protobuf/unittest_no_generic_services.proto   \
-  src/google/protobuf/unittest_optimize_for.proto          \
-  src/google/protobuf/unittest.proto                       \
-  src/google/protobuf/unittest_import_public.proto         \
-  src/google/protobuf/unittest_import_public_lite.proto    \
-  src/google/protobuf/unittest_drop_unknown_fields.proto   \
-  src/google/protobuf/unittest_preserve_unknown_enum.proto \
-  src/google/protobuf/map_lite_unittest.proto              \
-  src/google/protobuf/map_proto2_unittest.proto            \
-  src/google/protobuf/map_unittest.proto                   \
+CORE_PROTO_FILES=(
+  src/google/protobuf/unittest_arena.proto
+  src/google/protobuf/unittest_custom_options.proto
+  src/google/protobuf/unittest_enormous_descriptor.proto
+  src/google/protobuf/unittest_embed_optimize_for.proto
+  src/google/protobuf/unittest_empty.proto
+  src/google/protobuf/unittest_import.proto
+  src/google/protobuf/unittest_import_lite.proto
+  src/google/protobuf/unittest_lite.proto
+  src/google/protobuf/unittest_mset.proto
+  src/google/protobuf/unittest_mset_wire_format.proto
+  src/google/protobuf/unittest_no_arena.proto
+  src/google/protobuf/unittest_no_arena_import.proto
+  src/google/protobuf/unittest_no_generic_services.proto
+  src/google/protobuf/unittest_optimize_for.proto
+  src/google/protobuf/unittest.proto
+  src/google/protobuf/unittest_import_public.proto
+  src/google/protobuf/unittest_import_public_lite.proto
+  src/google/protobuf/unittest_drop_unknown_fields.proto
+  src/google/protobuf/unittest_preserve_unknown_enum.proto
+  src/google/protobuf/map_lite_unittest.proto
+  src/google/protobuf/map_proto2_unittest.proto
+  src/google/protobuf/map_unittest.proto
+)
+
+# The unittest_custom_options.proto extends the messages in descriptor.proto
+# so we build it in to test extending in general. The library doesn't provide
+# a descriptor as it doesn't use the classes/enums.
+CORE_PROTO_FILES+=(
+  src/google/protobuf/descriptor.proto
 )
 
 compile_proto() {
@@ -104,12 +111,12 @@
   compile_proto "${a_proto}"
 done
 
-OBJC_PROTO_FILES=(                               \
-  objectivec/Tests/unittest_cycle.proto          \
-  objectivec/Tests/unittest_runtime_proto2.proto \
-  objectivec/Tests/unittest_runtime_proto3.proto \
-  objectivec/Tests/unittest_objc.proto           \
-  objectivec/Tests/unittest_objc_startup.proto   \
+OBJC_PROTO_FILES=(
+  objectivec/Tests/unittest_cycle.proto
+  objectivec/Tests/unittest_runtime_proto2.proto
+  objectivec/Tests/unittest_runtime_proto3.proto
+  objectivec/Tests/unittest_objc.proto
+  objectivec/Tests/unittest_objc_startup.proto
 )
 
 for a_proto in "${OBJC_PROTO_FILES[@]}" ; do
diff --git a/objectivec/DevTools/full_mac_build.sh b/objectivec/DevTools/full_mac_build.sh
index c8681e2..b382779 100755
--- a/objectivec/DevTools/full_mac_build.sh
+++ b/objectivec/DevTools/full_mac_build.sh
@@ -190,7 +190,7 @@
 readonly NewestInput=$(find \
    src/google/protobuf/*.proto \
    src/.libs src/*.la src/protoc \
-   objectivec/generate_descriptors_proto.sh \
+   objectivec/generate_well_known_types.sh \
       -type f -print0 \
       | xargs -0 stat -f "%m %N" \
       | sort -n | tail -n1 | cut -f2- -d" ")
@@ -203,7 +203,7 @@
 # If the newest input is newer than the oldest output, regenerate.
 if [[ "${NewestInput}" -nt "${OldestOutput}" ]] ; then
   echo ">> Newest input is newer than oldest output, regenerating."
-  objectivec/generate_descriptors_proto.sh -j "${NUM_MAKE_JOBS}"
+  objectivec/generate_well_known_types.sh -j "${NUM_MAKE_JOBS}"
 else
   echo ">> Newest input is older than oldest output, no need to regenerating."
 fi
diff --git a/objectivec/GPBBootstrap.h b/objectivec/GPBBootstrap.h
index c49c7e2..ffefa77 100644
--- a/objectivec/GPBBootstrap.h
+++ b/objectivec/GPBBootstrap.h
@@ -37,13 +37,6 @@
 #define GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS 0
 #endif
 
-// Most uses of protocol buffers don't need field options, by default the
-// static data will be compiled out, define this to 1 to include it. The only
-// time you need this is if you are doing introspection of the protocol buffers.
-#ifndef GPBOBJC_INCLUDE_FIELD_OPTIONS
-#define GPBOBJC_INCLUDE_FIELD_OPTIONS 0
-#endif
-
 // Used in the generated code to give sizes to enums. int32_t was chosen based
 // on the fact that Protocol Buffers enums are limited to this range.
 #if !__has_feature(objc_fixed_enum)
@@ -89,4 +82,4 @@
 // generated Objective C sources.  In general we don't want to change the
 // runtime interfaces (or this version) as it means everything has to be
 // regenerated.
-#define GOOGLE_PROTOBUF_OBJC_GEN_VERSION 30000
+#define GOOGLE_PROTOBUF_OBJC_GEN_VERSION 30001
diff --git a/objectivec/GPBDescriptor.h b/objectivec/GPBDescriptor.h
index 8d8e975..a6eff0f 100644
--- a/objectivec/GPBDescriptor.h
+++ b/objectivec/GPBDescriptor.h
@@ -34,19 +34,18 @@
 
 @class GPBEnumDescriptor;
 @class GPBFieldDescriptor;
-@class GPBFieldOptions;
 @class GPBFileDescriptor;
 @class GPBOneofDescriptor;
 
 NS_ASSUME_NONNULL_BEGIN
 
-typedef NS_ENUM(NSInteger, GPBFileSyntax) {
+typedef NS_ENUM(uint8_t, GPBFileSyntax) {
   GPBFileSyntaxUnknown = 0,
   GPBFileSyntaxProto2 = 2,
   GPBFileSyntaxProto3 = 3,
 };
 
-typedef NS_ENUM(NSInteger, GPBFieldType) {
+typedef NS_ENUM(uint8_t, GPBFieldType) {
   GPBFieldTypeSingle,    // optional/required
   GPBFieldTypeRepeated,  // repeated
   GPBFieldTypeMap,       // map<K,V>
@@ -57,9 +56,8 @@
 @property(nonatomic, readonly, copy) NSString *name;
 @property(nonatomic, readonly, strong, nullable) NSArray<GPBFieldDescriptor*> *fields;
 @property(nonatomic, readonly, strong, nullable) NSArray<GPBOneofDescriptor*> *oneofs;
-@property(nonatomic, readonly, strong, nullable) NSArray<GPBEnumDescriptor*> *enums;
 @property(nonatomic, readonly, nullable) const GPBExtensionRange *extensionRanges;
-@property(nonatomic, readonly) NSUInteger extensionRangesCount;
+@property(nonatomic, readonly) uint32_t extensionRangesCount;
 @property(nonatomic, readonly, assign) GPBFileDescriptor *file;
 
 @property(nonatomic, readonly, getter=isWireFormat) BOOL wireFormat;
@@ -68,7 +66,6 @@
 - (nullable GPBFieldDescriptor *)fieldWithNumber:(uint32_t)fieldNumber;
 - (nullable GPBFieldDescriptor *)fieldWithName:(NSString *)name;
 - (nullable GPBOneofDescriptor *)oneofWithName:(NSString *)name;
-- (nullable GPBEnumDescriptor *)enumWithName:(NSString *)name;
 
 @end
 
@@ -103,8 +100,6 @@
 
 @property(nonatomic, readonly, assign, nullable) GPBOneofDescriptor *containingOneof;
 
-@property(nonatomic, readonly, nullable) GPBFieldOptions *fieldOptions;
-
 // Message properties
 @property(nonatomic, readonly, assign, nullable) Class msgClass;
 
diff --git a/objectivec/GPBDescriptor.m b/objectivec/GPBDescriptor.m
index bae9187..2709737 100644
--- a/objectivec/GPBDescriptor.m
+++ b/objectivec/GPBDescriptor.m
@@ -35,7 +35,6 @@
 #import "GPBUtilities_PackagePrivate.h"
 #import "GPBWireFormat.h"
 #import "GPBMessage_PackagePrivate.h"
-#import "google/protobuf/Descriptor.pbobjc.h"
 
 // The address of this variable is used as a key for obj_getAssociatedObject.
 static const char kTextFormatExtraValueKey = 0;
@@ -92,7 +91,6 @@
 
 @implementation GPBDescriptor {
   Class messageClass_;
-  NSArray *enums_;
   GPBFileDescriptor *file_;
   BOOL wireFormat_;
 }
@@ -100,7 +98,6 @@
 @synthesize messageClass = messageClass_;
 @synthesize fields = fields_;
 @synthesize oneofs = oneofs_;
-@synthesize enums = enums_;
 @synthesize extensionRanges = extensionRanges_;
 @synthesize extensionRangesCount = extensionRangesCount_;
 @synthesize file = file_;
@@ -110,130 +107,58 @@
     allocDescriptorForClass:(Class)messageClass
                   rootClass:(Class)rootClass
                        file:(GPBFileDescriptor *)file
-                     fields:(GPBMessageFieldDescription *)fieldDescriptions
-                 fieldCount:(NSUInteger)fieldCount
-                     oneofs:(GPBMessageOneofDescription *)oneofDescriptions
-                 oneofCount:(NSUInteger)oneofCount
-                      enums:(GPBMessageEnumDescription *)enumDescriptions
-                  enumCount:(NSUInteger)enumCount
-                     ranges:(const GPBExtensionRange *)ranges
-                 rangeCount:(NSUInteger)rangeCount
-                storageSize:(size_t)storageSize
-                 wireFormat:(BOOL)wireFormat {
+                     fields:(void *)fieldDescriptions
+                 fieldCount:(uint32_t)fieldCount
+                storageSize:(uint32_t)storageSize
+                      flags:(GPBDescriptorInitializationFlags)flags {
+  // The rootClass is no longer used, but it is passed in to ensure it
+  // was started up during initialization also.
+  (void)rootClass;
   NSMutableArray *fields = nil;
-  NSMutableArray *oneofs = nil;
-  NSMutableArray *enums = nil;
-  NSMutableArray *extensionRanges = nil;
   GPBFileSyntax syntax = file.syntax;
-  for (NSUInteger i = 0; i < fieldCount; ++i) {
+  BOOL fieldsIncludeDefault =
+      (flags & GPBDescriptorInitializationFlag_FieldsWithDefault) != 0;
+
+  void *desc;
+  for (uint32_t i = 0; i < fieldCount; ++i) {
     if (fields == nil) {
       fields = [[NSMutableArray alloc] initWithCapacity:fieldCount];
     }
-    GPBFieldDescriptor *fieldDescriptor = [[GPBFieldDescriptor alloc]
-        initWithFieldDescription:&fieldDescriptions[i]
-                       rootClass:rootClass
-                          syntax:syntax];
+    // Need correctly typed pointer for array indexing below to work.
+    if (fieldsIncludeDefault) {
+      GPBMessageFieldDescriptionWithDefault *fieldDescWithDefault = fieldDescriptions;
+      desc = &(fieldDescWithDefault[i]);
+    } else {
+      GPBMessageFieldDescription *fieldDesc = fieldDescriptions;
+      desc = &(fieldDesc[i]);
+    }
+    GPBFieldDescriptor *fieldDescriptor =
+        [[GPBFieldDescriptor alloc] initWithFieldDescription:desc
+                                             includesDefault:fieldsIncludeDefault
+                                                      syntax:syntax];
     [fields addObject:fieldDescriptor];
     [fieldDescriptor release];
   }
-  for (NSUInteger i = 0; i < oneofCount; ++i) {
-    if (oneofs == nil) {
-      oneofs = [[NSMutableArray alloc] initWithCapacity:oneofCount];
-    }
-    GPBMessageOneofDescription *oneofDescription = &oneofDescriptions[i];
-    NSArray *fieldsForOneof =
-        NewFieldsArrayForHasIndex(oneofDescription->index, fields);
-    GPBOneofDescriptor *oneofDescriptor =
-        [[GPBOneofDescriptor alloc] initWithOneofDescription:oneofDescription
-                                                      fields:fieldsForOneof];
-    [oneofs addObject:oneofDescriptor];
-    [oneofDescriptor release];
-    [fieldsForOneof release];
-  }
-  for (NSUInteger i = 0; i < enumCount; ++i) {
-    if (enums == nil) {
-      enums = [[NSMutableArray alloc] initWithCapacity:enumCount];
-    }
-    GPBEnumDescriptor *enumDescriptor =
-        enumDescriptions[i].enumDescriptorFunc();
-    [enums addObject:enumDescriptor];
-  }
 
+  BOOL wireFormat = (flags & GPBDescriptorInitializationFlag_WireFormat) != 0;
   GPBDescriptor *descriptor = [[self alloc] initWithClass:messageClass
                                                      file:file
                                                    fields:fields
-                                                   oneofs:oneofs
-                                                    enums:enums
-                                          extensionRanges:ranges
-                                     extensionRangesCount:rangeCount
                                               storageSize:storageSize
                                                wireFormat:wireFormat];
   [fields release];
-  [oneofs release];
-  [enums release];
-  [extensionRanges release];
-  return descriptor;
-}
-
-+ (instancetype)
-    allocDescriptorForClass:(Class)messageClass
-                  rootClass:(Class)rootClass
-                       file:(GPBFileDescriptor *)file
-                     fields:(GPBMessageFieldDescription *)fieldDescriptions
-                 fieldCount:(NSUInteger)fieldCount
-                     oneofs:(GPBMessageOneofDescription *)oneofDescriptions
-                 oneofCount:(NSUInteger)oneofCount
-                      enums:(GPBMessageEnumDescription *)enumDescriptions
-                  enumCount:(NSUInteger)enumCount
-                     ranges:(const GPBExtensionRange *)ranges
-                 rangeCount:(NSUInteger)rangeCount
-                storageSize:(size_t)storageSize
-                 wireFormat:(BOOL)wireFormat
-        extraTextFormatInfo:(const char *)extraTextFormatInfo {
-  GPBDescriptor *descriptor = [self allocDescriptorForClass:messageClass
-                                                  rootClass:rootClass
-                                                       file:file
-                                                     fields:fieldDescriptions
-                                                 fieldCount:fieldCount
-                                                     oneofs:oneofDescriptions
-                                                 oneofCount:oneofCount
-                                                      enums:enumDescriptions
-                                                  enumCount:enumCount
-                                                     ranges:ranges
-                                                 rangeCount:rangeCount
-                                                storageSize:storageSize
-                                                 wireFormat:wireFormat];
-  // Extra info is a compile time option, so skip the work if not needed.
-  if (extraTextFormatInfo) {
-    NSValue *extraInfoValue = [NSValue valueWithPointer:extraTextFormatInfo];
-    for (GPBFieldDescriptor *fieldDescriptor in descriptor->fields_) {
-      if (fieldDescriptor->description_->flags & GPBFieldTextFormatNameCustom) {
-        objc_setAssociatedObject(fieldDescriptor, &kTextFormatExtraValueKey,
-                                 extraInfoValue,
-                                 OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-      }
-    }
-  }
   return descriptor;
 }
 
 - (instancetype)initWithClass:(Class)messageClass
                          file:(GPBFileDescriptor *)file
                        fields:(NSArray *)fields
-                       oneofs:(NSArray *)oneofs
-                        enums:(NSArray *)enums
-              extensionRanges:(const GPBExtensionRange *)extensionRanges
-         extensionRangesCount:(NSUInteger)extensionRangesCount
-                  storageSize:(size_t)storageSize
+                  storageSize:(uint32_t)storageSize
                    wireFormat:(BOOL)wireFormat {
   if ((self = [super init])) {
     messageClass_ = messageClass;
     file_ = file;
     fields_ = [fields retain];
-    oneofs_ = [oneofs retain];
-    enums_ = [enums retain];
-    extensionRanges_ = extensionRanges;
-    extensionRangesCount_ = extensionRangesCount;
     storageSize_ = storageSize;
     wireFormat_ = wireFormat;
   }
@@ -243,10 +168,47 @@
 - (void)dealloc {
   [fields_ release];
   [oneofs_ release];
-  [enums_ release];
   [super dealloc];
 }
 
+- (void)setupOneofs:(const char **)oneofNames
+              count:(uint32_t)count
+      firstHasIndex:(int32_t)firstHasIndex {
+  NSCAssert(firstHasIndex < 0, @"Should always be <0");
+  NSMutableArray *oneofs = [[NSMutableArray alloc] initWithCapacity:count];
+  for (uint32_t i = 0, hasIndex = firstHasIndex; i < count; ++i, --hasIndex) {
+    const char *name = oneofNames[i];
+    NSArray *fieldsForOneof = NewFieldsArrayForHasIndex(hasIndex, fields_);
+    NSCAssert(fieldsForOneof.count > 0,
+              @"No fields for this oneof? (%s:%d)", name, hasIndex);
+    GPBOneofDescriptor *oneofDescriptor =
+        [[GPBOneofDescriptor alloc] initWithName:name fields:fieldsForOneof];
+    [oneofs addObject:oneofDescriptor];
+    [oneofDescriptor release];
+    [fieldsForOneof release];
+  }
+  oneofs_ = oneofs;
+}
+
+- (void)setupExtraTextInfo:(const char *)extraTextFormatInfo {
+  // Extra info is a compile time option, so skip the work if not needed.
+  if (extraTextFormatInfo) {
+    NSValue *extraInfoValue = [NSValue valueWithPointer:extraTextFormatInfo];
+    for (GPBFieldDescriptor *fieldDescriptor in fields_) {
+      if (fieldDescriptor->description_->flags & GPBFieldTextFormatNameCustom) {
+        objc_setAssociatedObject(fieldDescriptor, &kTextFormatExtraValueKey,
+                                 extraInfoValue,
+                                 OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+      }
+    }
+  }
+}
+
+- (void)setupExtensionRanges:(const GPBExtensionRange *)ranges count:(int32_t)count {
+  extensionRanges_ = ranges;
+  extensionRangesCount_ = count;
+}
+
 - (NSString *)name {
   return NSStringFromClass(messageClass_);
 }
@@ -283,15 +245,6 @@
   return nil;
 }
 
-- (GPBEnumDescriptor *)enumWithName:(NSString *)name {
-  for (GPBEnumDescriptor *descriptor in enums_) {
-    if ([descriptor.name isEqual:name]) {
-      return descriptor;
-    }
-  }
-  return nil;
-}
-
 @end
 
 @implementation GPBFileDescriptor {
@@ -318,19 +271,16 @@
 
 @synthesize fields = fields_;
 
-- (instancetype)initWithOneofDescription:
-                    (GPBMessageOneofDescription *)oneofDescription
-                                  fields:(NSArray *)fields {
+- (instancetype)initWithName:(const char *)name fields:(NSArray *)fields {
   self = [super init];
   if (self) {
-    NSAssert(oneofDescription->index < 0, @"Should always be <0");
-    oneofDescription_ = oneofDescription;
+    name_ = name;
     fields_ = [fields retain];
     for (GPBFieldDescriptor *fieldDesc in fields) {
       fieldDesc->containingOneof_ = self;
     }
 
-    caseSel_ = SelFromStrings(NULL, oneofDescription->name, "OneOfCase", NO);
+    caseSel_ = SelFromStrings(NULL, name, "OneOfCase", NO);
   }
   return self;
 }
@@ -341,7 +291,7 @@
 }
 
 - (NSString *)name {
-  return @(oneofDescription_->name);
+  return @(name_);
 }
 
 - (GPBFieldDescriptor *)fieldWithNumber:(uint32_t)fieldNumber {
@@ -389,7 +339,6 @@
 
 @implementation GPBFieldDescriptor {
   GPBGenericValue defaultValue_;
-  GPBFieldOptions *fieldOptions_;
 
   // Message ivars
   Class msgClass_;
@@ -403,7 +352,6 @@
   } enumHandling_;
 }
 
-@synthesize fieldOptions = fieldOptions_;
 @synthesize msgClass = msgClass_;
 @synthesize containingOneof = containingOneof_;
 
@@ -417,16 +365,21 @@
   return self;
 }
 
-- (instancetype)initWithFieldDescription:
-                    (GPBMessageFieldDescription *)description
-                               rootClass:(Class)rootClass
+- (instancetype)initWithFieldDescription:(void *)description
+                         includesDefault:(BOOL)includesDefault
                                   syntax:(GPBFileSyntax)syntax {
   if ((self = [super init])) {
-    description_ = description;
-    getSel_ = sel_getUid(description->name);
-    setSel_ = SelFromStrings("set", description->name, NULL, YES);
+    GPBMessageFieldDescription *coreDesc;
+    if (includesDefault) {
+      coreDesc = &(((GPBMessageFieldDescriptionWithDefault *)description)->core);
+    } else {
+      coreDesc = description;
+    }
+    description_ = coreDesc;
+    getSel_ = sel_getUid(coreDesc->name);
+    setSel_ = SelFromStrings("set", coreDesc->name, NULL, YES);
 
-    GPBDataType dataType = description->dataType;
+    GPBDataType dataType = coreDesc->dataType;
     BOOL isMessage = GPBDataTypeIsMessage(dataType);
     BOOL isMapOrArray = GPBFieldIsMapOrArray(self);
 
@@ -434,39 +387,39 @@
       // map<>/repeated fields get a *Count property (inplace of a has*) to
       // support checking if there are any entries without triggering
       // autocreation.
-      hasOrCountSel_ = SelFromStrings(NULL, description->name, "_Count", NO);
+      hasOrCountSel_ = SelFromStrings(NULL, coreDesc->name, "_Count", NO);
     } else {
       // If there is a positive hasIndex, then:
       //   - All fields types for proto2 messages get has* selectors.
       //   - Only message fields for proto3 messages get has* selectors.
       // Note: the positive check is to handle oneOfs, we can't check
       // containingOneof_ because it isn't set until after initialization.
-      if ((description->hasIndex >= 0) &&
-          (description->hasIndex != GPBNoHasBit) &&
+      if ((coreDesc->hasIndex >= 0) &&
+          (coreDesc->hasIndex != GPBNoHasBit) &&
           ((syntax != GPBFileSyntaxProto3) || isMessage)) {
-        hasOrCountSel_ = SelFromStrings("has", description->name, NULL, NO);
-        setHasSel_ = SelFromStrings("setHas", description->name, NULL, YES);
+        hasOrCountSel_ = SelFromStrings("has", coreDesc->name, NULL, NO);
+        setHasSel_ = SelFromStrings("setHas", coreDesc->name, NULL, YES);
       }
     }
 
     // Extra type specific data.
     if (isMessage) {
-      const char *className = description->dataTypeSpecific.className;
+      const char *className = coreDesc->dataTypeSpecific.className;
       msgClass_ = objc_getClass(className);
       NSAssert(msgClass_, @"Class %s not defined", className);
     } else if (dataType == GPBDataTypeEnum) {
-      if ((description_->flags & GPBFieldHasEnumDescriptor) != 0) {
+      if ((coreDesc->flags & GPBFieldHasEnumDescriptor) != 0) {
         enumHandling_.enumDescriptor_ =
-            description->dataTypeSpecific.enumDescFunc();
+            coreDesc->dataTypeSpecific.enumDescFunc();
       } else {
         enumHandling_.enumVerifier_ =
-            description->dataTypeSpecific.enumVerifier;
+            coreDesc->dataTypeSpecific.enumVerifier;
       }
     }
 
-    // Non map<>/repeated fields can have defaults.
-    if (!isMapOrArray) {
-      defaultValue_ = description->defaultValue;
+    // Non map<>/repeated fields can have defaults in proto2 syntax.
+    if (!isMapOrArray && includesDefault) {
+      defaultValue_ = ((GPBMessageFieldDescriptionWithDefault *)description)->defaultValue;
       if (dataType == GPBDataTypeBytes) {
         // Data stored as a length prefixed (network byte order) c-string in
         // descriptor structure.
@@ -480,24 +433,6 @@
         }
       }
     }
-
-    // FieldOptions stored as a length prefixed (network byte order) c-escaped
-    // string in descriptor records.
-    if (description->fieldOptions) {
-      uint8_t *optionsBytes = (uint8_t *)description->fieldOptions;
-      uint32_t optionsLength = *((uint32_t *)optionsBytes);
-      optionsLength = ntohl(optionsLength);
-      if (optionsLength > 0) {
-        optionsBytes += sizeof(optionsLength);
-        NSData *optionsData = [NSData dataWithBytesNoCopy:optionsBytes
-                                                   length:optionsLength
-                                             freeWhenDone:NO];
-        GPBExtensionRegistry *registry = [rootClass extensionRegistry];
-        fieldOptions_ = [[GPBFieldOptions parseFromData:optionsData
-                                      extensionRegistry:registry
-                                                  error:NULL] retain];
-      }
-    }
   }
   return self;
 }
@@ -666,7 +601,7 @@
   } else {
     // Undo the CamelCase.
     NSMutableString *result = [NSMutableString stringWithCapacity:len];
-    for (NSUInteger i = 0; i < len; i++) {
+    for (uint32_t i = 0; i < len; i++) {
       unichar c = [name characterAtIndex:i];
       if (c >= 'A' && c <= 'Z') {
         if (i > 0) {
@@ -686,10 +621,16 @@
 
 @implementation GPBEnumDescriptor {
   NSString *name_;
-  GPBMessageEnumValueDescription *valueDescriptions_;
-  NSUInteger valueDescriptionsCount_;
+  // valueNames_ is a single c string with all of the value names appended
+  // together, each null terminated.  -calcValueNameOffsets fills in
+  // nameOffsets_ with the offsets to allow quicker access to the individual
+  // names.
+  const char *valueNames_;
+  const int32_t *values_;
   GPBEnumValidationFunc enumVerifier_;
   const uint8_t *extraTextFormatInfo_;
+  uint32_t *nameOffsets_;
+  uint32_t valueCount_;
 }
 
 @synthesize name = name_;
@@ -697,26 +638,30 @@
 
 + (instancetype)
     allocDescriptorForName:(NSString *)name
-                    values:(GPBMessageEnumValueDescription *)valueDescriptions
-                valueCount:(NSUInteger)valueCount
+                valueNames:(const char *)valueNames
+                    values:(const int32_t *)values
+                     count:(uint32_t)valueCount
               enumVerifier:(GPBEnumValidationFunc)enumVerifier {
   GPBEnumDescriptor *descriptor = [[self alloc] initWithName:name
-                                                      values:valueDescriptions
-                                                  valueCount:valueCount
+                                                  valueNames:valueNames
+                                                      values:values
+                                                       count:valueCount
                                                 enumVerifier:enumVerifier];
   return descriptor;
 }
 
 + (instancetype)
     allocDescriptorForName:(NSString *)name
-                    values:(GPBMessageEnumValueDescription *)valueDescriptions
-                valueCount:(NSUInteger)valueCount
+                valueNames:(const char *)valueNames
+                    values:(const int32_t *)values
+                     count:(uint32_t)valueCount
               enumVerifier:(GPBEnumValidationFunc)enumVerifier
        extraTextFormatInfo:(const char *)extraTextFormatInfo {
   // Call the common case.
   GPBEnumDescriptor *descriptor = [self allocDescriptorForName:name
-                                                        values:valueDescriptions
-                                                    valueCount:valueCount
+                                                    valueNames:valueNames
+                                                        values:values
+                                                         count:valueCount
                                                   enumVerifier:enumVerifier];
   // Set the extra info.
   descriptor->extraTextFormatInfo_ = (const uint8_t *)extraTextFormatInfo;
@@ -724,24 +669,49 @@
 }
 
 - (instancetype)initWithName:(NSString *)name
-                      values:(GPBMessageEnumValueDescription *)valueDescriptions
-                  valueCount:(NSUInteger)valueCount
+                  valueNames:(const char *)valueNames
+                      values:(const int32_t *)values
+                       count:(uint32_t)valueCount
                 enumVerifier:(GPBEnumValidationFunc)enumVerifier {
   if ((self = [super init])) {
     name_ = [name copy];
-    valueDescriptions_ = valueDescriptions;
-    valueDescriptionsCount_ = valueCount;
+    valueNames_ = valueNames;
+    values_ = values;
+    valueCount_ = valueCount;
     enumVerifier_ = enumVerifier;
   }
   return self;
 }
 
+- (void)dealloc {
+  [name_ release];
+  if (nameOffsets_) free(nameOffsets_);
+  [super dealloc];
+}
+
+- (void)calcValueNameOffsets {
+  @synchronized(self) {
+    if (nameOffsets_ != NULL) {
+      return;
+    }
+    uint32_t *offsets = malloc(valueCount_ * sizeof(uint32_t));
+    const char *scan = valueNames_;
+    for (uint32_t i = 0; i < valueCount_; ++i) {
+      offsets[i] = (uint32_t)(scan - valueNames_);
+      while (*scan != '\0') ++scan;
+      ++scan;  // Step over the null.
+    }
+    nameOffsets_ = offsets;
+  }
+}
+
 - (NSString *)enumNameForValue:(int32_t)number {
-  for (NSUInteger i = 0; i < valueDescriptionsCount_; ++i) {
-    GPBMessageEnumValueDescription *scan = &valueDescriptions_[i];
-    if ((scan->number == number) && (scan->name != NULL)) {
-      NSString *fullName =
-          [NSString stringWithFormat:@"%@_%s", name_, scan->name];
+  if (nameOffsets_ == NULL) [self calcValueNameOffsets];
+
+  for (uint32_t i = 0; i < valueCount_; ++i) {
+    if (values_[i] == number) {
+      const char *valueName = valueNames_ + nameOffsets_[i];
+      NSString *fullName = [NSString stringWithFormat:@"%@_%s", name_, valueName];
       return fullName;
     }
   }
@@ -760,12 +730,14 @@
   const char *nameAsCStr = [name UTF8String];
   nameAsCStr += prefixLen;
 
+  if (nameOffsets_ == NULL) [self calcValueNameOffsets];
+
   // Find it.
-  for (NSUInteger i = 0; i < valueDescriptionsCount_; ++i) {
-    GPBMessageEnumValueDescription *scan = &valueDescriptions_[i];
-    if ((scan->name != NULL) && (strcmp(nameAsCStr, scan->name) == 0)) {
+  for (uint32_t i = 0; i < valueCount_; ++i) {
+    const char *valueName = valueNames_ + nameOffsets_[i];
+    if (strcmp(nameAsCStr, valueName) == 0) {
       if (outValue) {
-        *outValue = scan->number;
+        *outValue = values_[i];
       }
       return YES;
     }
@@ -773,34 +745,28 @@
   return NO;
 }
 
-- (void)dealloc {
-  [name_ release];
-  [super dealloc];
-}
-
 - (NSString *)textFormatNameForValue:(int32_t)number {
+  if (nameOffsets_ == NULL) [self calcValueNameOffsets];
+
   // Find the EnumValue descriptor and its index.
-  GPBMessageEnumValueDescription *valueDescriptor = NULL;
-  NSUInteger valueDescriptorIndex;
-  for (valueDescriptorIndex = 0; valueDescriptorIndex < valueDescriptionsCount_;
+  BOOL foundIt = NO;
+  uint32_t valueDescriptorIndex;
+  for (valueDescriptorIndex = 0; valueDescriptorIndex < valueCount_;
        ++valueDescriptorIndex) {
-    GPBMessageEnumValueDescription *scan =
-        &valueDescriptions_[valueDescriptorIndex];
-    if (scan->number == number) {
-      valueDescriptor = scan;
+    if (values_[valueDescriptorIndex] == number) {
+      foundIt = YES;
       break;
     }
   }
 
-  // If we didn't find it, or names were disable at proto compile time, nothing
-  // we can do.
-  if (!valueDescriptor || !valueDescriptor->name) {
+  if (!foundIt) {
     return nil;
   }
 
   NSString *result = nil;
   // Naming adds an underscore between enum name and value name, skip that also.
-  NSString *shortName = @(valueDescriptor->name);
+  const char *valueName = valueNames_ + nameOffsets_[valueDescriptorIndex];
+  NSString *shortName = @(valueName);
 
   // See if it is in the map of special format handling.
   if (extraTextFormatInfo_) {
diff --git a/objectivec/GPBDescriptor_PackagePrivate.h b/objectivec/GPBDescriptor_PackagePrivate.h
index 7987d92..e3d0a80 100644
--- a/objectivec/GPBDescriptor_PackagePrivate.h
+++ b/objectivec/GPBDescriptor_PackagePrivate.h
@@ -36,7 +36,7 @@
 #import "GPBWireFormat.h"
 
 // Describes attributes of the field.
-typedef NS_OPTIONS(uint32_t, GPBFieldFlags) {
+typedef NS_OPTIONS(uint16_t, GPBFieldFlags) {
   // These map to standard protobuf concepts.
   GPBFieldRequired        = 1 << 0,
   GPBFieldRepeated        = 1 << 1,
@@ -44,6 +44,12 @@
   GPBFieldOptional        = 1 << 3,
   GPBFieldHasDefaultValue = 1 << 4,
 
+  // Indicates the field needs custom handling for the TextFormat name, if not
+  // set, the name can be derived from the ObjC name.
+  GPBFieldTextFormatNameCustom = 1 << 6,
+  // Indicates the field has an enum descriptor.
+  GPBFieldHasEnumDescriptor = 1 << 7,
+
   // These are not standard protobuf concepts, they are specific to the
   // Objective C runtime.
 
@@ -62,35 +68,16 @@
   GPBFieldMapKeySFixed64 = 10 << 8,
   GPBFieldMapKeyBool     = 11 << 8,
   GPBFieldMapKeyString   = 12 << 8,
-
-  // Indicates the field needs custom handling for the TextFormat name, if not
-  // set, the name can be derived from the ObjC name.
-  GPBFieldTextFormatNameCustom = 1 << 16,
-  // Indicates the field has an enum descriptor.
-  GPBFieldHasEnumDescriptor = 1 << 17,
 };
 
+// NOTE: The structures defined here have their members ordered to minimize
+// their size. This directly impacts the size of apps since these exist per
+// field/extension.
+
 // Describes a single field in a protobuf as it is represented as an ivar.
 typedef struct GPBMessageFieldDescription {
   // Name of ivar.
   const char *name;
-  // The field number for the ivar.
-  uint32_t number;
-  // The index (in bits) into _has_storage_.
-  //   > 0: the bit to use for a value being set.
-  //   = 0: no storage used.
-  //   < 0: in a oneOf, use a full int32 to record the field active.
-  int32_t hasIndex;
-  // Field flags. Use accessor functions below.
-  GPBFieldFlags flags;
-  // Data type of the ivar.
-  GPBDataType dataType;
-  // Offset of the variable into it's structure struct.
-  size_t offset;
-  // FieldOptions protobuf, serialized as string.
-  const char *fieldOptions;
-
-  GPBGenericValue defaultValue;  // Default value for the ivar.
   union {
     const char *className;  // Name for message class.
     // For enums only: If EnumDescriptors are compiled in, it will be that,
@@ -98,31 +85,32 @@
     GPBEnumDescriptorFunc enumDescFunc;
     GPBEnumValidationFunc enumVerifier;
   } dataTypeSpecific;
+  // The field number for the ivar.
+  uint32_t number;
+  // The index (in bits) into _has_storage_.
+  //   >= 0: the bit to use for a value being set.
+  //   = GPBNoHasBit(INT32_MAX): no storage used.
+  //   < 0: in a oneOf, use a full int32 to record the field active.
+  int32_t hasIndex;
+  // Offset of the variable into it's structure struct.
+  uint32_t offset;
+  // Field flags. Use accessor functions below.
+  GPBFieldFlags flags;
+  // Data type of the ivar.
+  GPBDataType dataType;
 } GPBMessageFieldDescription;
 
-// Describes a oneof.
-typedef struct GPBMessageOneofDescription {
-  // Name of this enum oneof.
-  const char *name;
-  // The index of this oneof in the has_storage.
-  int32_t index;
-} GPBMessageOneofDescription;
+// Fields in messages defined in a 'proto2' syntax file can provide a default
+// value. This struct provides the default along with the field info.
+typedef struct GPBMessageFieldDescriptionWithDefault {
+  // Default value for the ivar.
+  GPBGenericValue defaultValue;
 
-// Describes an enum type defined in a .proto file.
-typedef struct GPBMessageEnumDescription {
-  GPBEnumDescriptorFunc enumDescriptorFunc;
-} GPBMessageEnumDescription;
-
-// Describes an individual enum constant of a particular type.
-typedef struct GPBMessageEnumValueDescription {
-  // Name of this enum constant.
-  const char *name;
-  // Numeric value of this enum constant.
-  int32_t number;
-} GPBMessageEnumValueDescription;
+  GPBMessageFieldDescription core;
+} GPBMessageFieldDescriptionWithDefault;
 
 // Describes attributes of the extension.
-typedef NS_OPTIONS(uint32_t, GPBExtensionOptions) {
+typedef NS_OPTIONS(uint8_t, GPBExtensionOptions) {
   // These map to standard protobuf concepts.
   GPBExtensionRepeated      = 1 << 0,
   GPBExtensionPacked        = 1 << 1,
@@ -131,65 +119,53 @@
 
 // An extension
 typedef struct GPBExtensionDescription {
-  const char *singletonName;
-  GPBDataType dataType;
-  const char *extendedClass;
-  int32_t fieldNumber;
   GPBGenericValue defaultValue;
+  const char *singletonName;
+  const char *extendedClass;
   const char *messageOrGroupClassName;
-  GPBExtensionOptions options;
   GPBEnumDescriptorFunc enumDescriptorFunc;
+  int32_t fieldNumber;
+  GPBDataType dataType;
+  GPBExtensionOptions options;
 } GPBExtensionDescription;
 
+typedef NS_OPTIONS(uint32_t, GPBDescriptorInitializationFlags) {
+  GPBDescriptorInitializationFlag_FieldsWithDefault = 1 << 0,
+  GPBDescriptorInitializationFlag_WireFormat        = 1 << 1,
+};
+
 @interface GPBDescriptor () {
  @package
   NSArray *fields_;
   NSArray *oneofs_;
-  size_t storageSize_;
+  uint32_t storageSize_;
 }
 
-// fieldDescriptions, enumDescriptions, rangeDescriptions, and
-// extraTextFormatInfo have to be long lived, they are held as raw pointers.
+// fieldDescriptions have to be long lived, they are held as raw pointers.
 + (instancetype)
     allocDescriptorForClass:(Class)messageClass
                   rootClass:(Class)rootClass
                        file:(GPBFileDescriptor *)file
-                     fields:(GPBMessageFieldDescription *)fieldDescriptions
-                 fieldCount:(NSUInteger)fieldCount
-                     oneofs:(GPBMessageOneofDescription *)oneofDescriptions
-                 oneofCount:(NSUInteger)oneofCount
-                      enums:(GPBMessageEnumDescription *)enumDescriptions
-                  enumCount:(NSUInteger)enumCount
-                     ranges:(const GPBExtensionRange *)ranges
-                 rangeCount:(NSUInteger)rangeCount
-                storageSize:(size_t)storageSize
-                 wireFormat:(BOOL)wireFormat;
-+ (instancetype)
-    allocDescriptorForClass:(Class)messageClass
-                  rootClass:(Class)rootClass
-                       file:(GPBFileDescriptor *)file
-                     fields:(GPBMessageFieldDescription *)fieldDescriptions
-                 fieldCount:(NSUInteger)fieldCount
-                     oneofs:(GPBMessageOneofDescription *)oneofDescriptions
-                 oneofCount:(NSUInteger)oneofCount
-                      enums:(GPBMessageEnumDescription *)enumDescriptions
-                  enumCount:(NSUInteger)enumCount
-                     ranges:(const GPBExtensionRange *)ranges
-                 rangeCount:(NSUInteger)rangeCount
-                storageSize:(size_t)storageSize
-                 wireFormat:(BOOL)wireFormat
-        extraTextFormatInfo:(const char *)extraTextFormatInfo;
+                     fields:(void *)fieldDescriptions
+                 fieldCount:(uint32_t)fieldCount
+                storageSize:(uint32_t)storageSize
+                      flags:(GPBDescriptorInitializationFlags)flags;
 
 - (instancetype)initWithClass:(Class)messageClass
                          file:(GPBFileDescriptor *)file
                        fields:(NSArray *)fields
-                       oneofs:(NSArray *)oneofs
-                        enums:(NSArray *)enums
-              extensionRanges:(const GPBExtensionRange *)ranges
-         extensionRangesCount:(NSUInteger)rangeCount
-                  storageSize:(size_t)storage
+                  storageSize:(uint32_t)storage
                    wireFormat:(BOOL)wireFormat;
 
+// Called right after init to provide extra information to avoid init having
+// an explosion of args. These pointers are recorded, so they are expected
+// to live for the lifetime of the app.
+- (void)setupOneofs:(const char **)oneofNames
+              count:(uint32_t)count
+      firstHasIndex:(int32_t)firstHasIndex;
+- (void)setupExtraTextInfo:(const char *)extraTextFormatInfo;
+- (void)setupExtensionRanges:(const GPBExtensionRange *)ranges count:(int32_t)count;
+
 @end
 
 @interface GPBFileDescriptor ()
@@ -199,14 +175,12 @@
 
 @interface GPBOneofDescriptor () {
  @package
-  GPBMessageOneofDescription *oneofDescription_;
+  const char *name_;
   NSArray *fields_;
-
   SEL caseSel_;
 }
-- (instancetype)initWithOneofDescription:
-                    (GPBMessageOneofDescription *)oneofDescription
-                                  fields:(NSArray *)fields;
+// name must be long lived.
+- (instancetype)initWithName:(const char *)name fields:(NSArray *)fields;
 @end
 
 @interface GPBFieldDescriptor () {
@@ -222,30 +196,32 @@
 
 // Single initializer
 // description has to be long lived, it is held as a raw pointer.
-- (instancetype)initWithFieldDescription:
-                    (GPBMessageFieldDescription *)description
-                               rootClass:(Class)rootClass
+- (instancetype)initWithFieldDescription:(void *)description
+                         includesDefault:(BOOL)includesDefault
                                   syntax:(GPBFileSyntax)syntax;
 @end
 
 @interface GPBEnumDescriptor ()
-// valueDescriptions and extraTextFormatInfo have to be long lived, they are
+// valueNames, values and extraTextFormatInfo have to be long lived, they are
 // held as raw pointers.
 + (instancetype)
     allocDescriptorForName:(NSString *)name
-                    values:(GPBMessageEnumValueDescription *)valueDescriptions
-                valueCount:(NSUInteger)valueCount
+                valueNames:(const char *)valueNames
+                    values:(const int32_t *)values
+                     count:(uint32_t)valueCount
               enumVerifier:(GPBEnumValidationFunc)enumVerifier;
 + (instancetype)
     allocDescriptorForName:(NSString *)name
-                    values:(GPBMessageEnumValueDescription *)valueDescriptions
-                valueCount:(NSUInteger)valueCount
+                valueNames:(const char *)valueNames
+                    values:(const int32_t *)values
+                     count:(uint32_t)valueCount
               enumVerifier:(GPBEnumValidationFunc)enumVerifier
        extraTextFormatInfo:(const char *)extraTextFormatInfo;
 
 - (instancetype)initWithName:(NSString *)name
-                      values:(GPBMessageEnumValueDescription *)valueDescriptions
-                  valueCount:(NSUInteger)valueCount
+                  valueNames:(const char *)valueNames
+                      values:(const int32_t *)values
+                       count:(uint32_t)valueCount
                 enumVerifier:(GPBEnumValidationFunc)enumVerifier;
 @end
 
@@ -314,5 +290,24 @@
   return (description->options & GPBExtensionSetWireFormat) != 0;
 }
 
+// Helper for compile time assets.
+#ifndef _GPBCompileAssert
+  #if __has_feature(c_static_assert) || __has_extension(c_static_assert)
+    #define _GPBCompileAssert(test, msg) _Static_assert((test), #msg)
+  #else
+    // Pre-Xcode 7 support.
+    #define _GPBCompileAssertSymbolInner(line, msg) _GPBCompileAssert ## line ## __ ## msg
+    #define _GPBCompileAssertSymbol(line, msg) _GPBCompileAssertSymbolInner(line, msg)
+    #define _GPBCompileAssert(test, msg) \
+        typedef char _GPBCompileAssertSymbol(__LINE__, msg) [ ((test) ? 1 : -1) ]
+  #endif  // __has_feature(c_static_assert) || __has_extension(c_static_assert)
+#endif // _GPBCompileAssert
+
+// Sanity check that there isn't padding between the field description
+// structures with and without a default.
+_GPBCompileAssert(sizeof(GPBMessageFieldDescriptionWithDefault) ==
+                  (sizeof(GPBGenericValue) +
+                   sizeof(GPBMessageFieldDescription)),
+                  DescriptionsWithDefault_different_size_than_expected);
 
 CF_EXTERN_C_END
diff --git a/objectivec/GPBMessage.m b/objectivec/GPBMessage.m
index d5e8d37..94d179b 100644
--- a/objectivec/GPBMessage.m
+++ b/objectivec/GPBMessage.m
@@ -54,18 +54,6 @@
 
 static NSString *const kGPBDataCoderKey = @"GPBData";
 
-#ifndef _GPBCompileAssert
-  #if __has_feature(c_static_assert) || __has_extension(c_static_assert)
-    #define _GPBCompileAssert(test, msg) _Static_assert((test), #msg)
-  #else
-    // Pre-Xcode 7 support.
-    #define _GPBCompileAssertSymbolInner(line, msg) _GPBCompileAssert ## line ## __ ## msg
-    #define _GPBCompileAssertSymbol(line, msg) _GPBCompileAssertSymbolInner(line, msg)
-    #define _GPBCompileAssert(test, msg) \
-        typedef char _GPBCompileAssertSymbol(__LINE__, msg) [ ((test) ? 1 : -1) ]
-  #endif  // __has_feature(c_static_assert) || __has_extension(c_static_assert)
-#endif // _GPBCompileAssert
-
 //
 // PLEASE REMEMBER:
 //
@@ -789,14 +777,8 @@
                                                    file:fileDescriptor
                                                  fields:NULL
                                              fieldCount:0
-                                                 oneofs:NULL
-                                             oneofCount:0
-                                                  enums:NULL
-                                              enumCount:0
-                                                 ranges:NULL
-                                             rangeCount:0
                                             storageSize:0
-                                             wireFormat:NO];
+                                                  flags:0];
   }
   return descriptor;
 }
@@ -3096,7 +3078,7 @@
       } else {
         GPBOneofDescriptor *oneof = field->containingOneof_;
         if (oneof && (sel == oneof->caseSel_)) {
-          int32_t index = oneof->oneofDescription_->index;
+          int32_t index = GPBFieldHasIndex(field);
           result.impToAdd = imp_implementationWithBlock(^(id obj) {
             return GPBGetHasOneof(obj, index);
           });
diff --git a/objectivec/GPBProtocolBuffers.m b/objectivec/GPBProtocolBuffers.m
index e9cbfb4..8512af7 100644
--- a/objectivec/GPBProtocolBuffers.m
+++ b/objectivec/GPBProtocolBuffers.m
@@ -46,8 +46,6 @@
 #import "GPBWellKnownTypes.m"
 #import "GPBWireFormat.m"
 
-#import "google/protobuf/Descriptor.pbobjc.m"
-
 // Duration and Timestamp are #imported into GPBWellKnownTypes.m to the
 // Objective C categories added will always be linked in with the classes.
 #import "google/protobuf/Any.pbobjc.m"
diff --git a/objectivec/GPBRuntimeTypes.h b/objectivec/GPBRuntimeTypes.h
index e91d86a..0a38b11 100644
--- a/objectivec/GPBRuntimeTypes.h
+++ b/objectivec/GPBRuntimeTypes.h
@@ -67,7 +67,7 @@
 
 // Do not change the order of this enum (or add things to it) without thinking
 // about it very carefully. There are several things that depend on the order.
-typedef enum {
+typedef NS_ENUM(uint8_t, GPBDataType) {
   GPBDataTypeBool = 0,
   GPBDataTypeFixed32,
   GPBDataTypeSFixed32,
@@ -86,7 +86,7 @@
   GPBDataTypeMessage,
   GPBDataTypeGroup,
   GPBDataTypeEnum,
-} GPBDataType;
+};
 
 enum {
   // A count of the number of types in GPBDataType. Separated out from the
diff --git a/objectivec/GPBUtilities.m b/objectivec/GPBUtilities.m
index d4d6471..3e9d11c 100644
--- a/objectivec/GPBUtilities.m
+++ b/objectivec/GPBUtilities.m
@@ -145,9 +145,8 @@
 }
 
 void GPBMaybeClearOneof(GPBMessage *self, GPBOneofDescriptor *oneof,
-                        uint32_t fieldNumberNotToClear) {
-  int32_t hasIndex = oneof->oneofDescription_->index;
-  uint32_t fieldNumberSet = GPBGetHasOneof(self, hasIndex);
+                        int32_t oneofHasIndex, uint32_t fieldNumberNotToClear) {
+  uint32_t fieldNumberSet = GPBGetHasOneof(self, oneofHasIndex);
   if ((fieldNumberSet == fieldNumberNotToClear) || (fieldNumberSet == 0)) {
     // Do nothing/nothing set in the oneof.
     return;
@@ -168,7 +167,7 @@
 
   // Set to nothing stored in the oneof.
   // (field number doesn't matter since setting to nothing).
-  GPBSetHasIvar(self, hasIndex, 1, NO);
+  GPBSetHasIvar(self, oneofHasIndex, 1, NO);
 }
 
 #pragma mark - IVar accessors
@@ -200,7 +199,8 @@
 //%            NAME$S                     GPBFileSyntax syntax) {
 //%  GPBOneofDescriptor *oneof = field->containingOneof_;
 //%  if (oneof) {
-//%    GPBMaybeClearOneof(self, oneof, GPBFieldNumber(field));
+//%    GPBMessageFieldDescription *fieldDesc = field->description_;
+//%    GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
 //%  }
 //%  NSCAssert(self->messageStorage_ != NULL,
 //%            @"%@: All messages should have storage (from init)",
@@ -321,7 +321,8 @@
     // oneof.
     GPBOneofDescriptor *oneof = field->containingOneof_;
     if (oneof) {
-      GPBMaybeClearOneof(self, oneof, GPBFieldNumber(field));
+      GPBMessageFieldDescription *fieldDesc = field->description_;
+      GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
     }
     // Clear "has" if they are being set to nil.
     BOOL setHasValue = (value != nil);
@@ -476,15 +477,15 @@
   GPBSetInt32IvarWithFieldInternal(self, field, value, syntax);
 }
 
-//%PDDM-EXPAND IVAR_POD_ACCESSORS_DEFN(Bool, BOOL)
-// This block of code is generated, do not edit it directly.
-
 BOOL GPBGetMessageBoolField(GPBMessage *self,
                             GPBFieldDescriptor *field) {
   if (GPBGetHasIvarField(self, field)) {
-    uint8_t *storage = (uint8_t *)self->messageStorage_;
-    BOOL *typePtr = (BOOL *)&storage[field->description_->offset];
-    return *typePtr;
+    // Bools are stored in the has bits to avoid needing explicit space in the
+    // storage structure.
+    // (the field number passed to the HasIvar helper doesn't really matter
+    // since the offset is never negative)
+    GPBMessageFieldDescription *fieldDesc = field->description_;
+    return GPBGetHasIvar(self, (int32_t)(fieldDesc->offset), fieldDesc->number);
   } else {
     return field.defaultValue.valueBool;
   }
@@ -503,19 +504,18 @@
                                      GPBFieldDescriptor *field,
                                      BOOL value,
                                      GPBFileSyntax syntax) {
+  GPBMessageFieldDescription *fieldDesc = field->description_;
   GPBOneofDescriptor *oneof = field->containingOneof_;
   if (oneof) {
-    GPBMaybeClearOneof(self, oneof, GPBFieldNumber(field));
+    GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
   }
-  NSCAssert(self->messageStorage_ != NULL,
-            @"%@: All messages should have storage (from init)",
-            [self class]);
-#if defined(__clang_analyzer__)
-  if (self->messageStorage_ == NULL) return;
-#endif
-  uint8_t *storage = (uint8_t *)self->messageStorage_;
-  BOOL *typePtr = (BOOL *)&storage[field->description_->offset];
-  *typePtr = value;
+
+  // Bools are stored in the has bits to avoid needing explicit space in the
+  // storage structure.
+  // (the field number passed to the HasIvar helper doesn't really matter since
+  // the offset is never negative)
+  GPBSetHasIvar(self, (int32_t)(fieldDesc->offset), fieldDesc->number, value);
+
   // proto2: any value counts as having been set; proto3, it
   // has to be a non zero value.
   BOOL hasValue =
@@ -553,7 +553,8 @@
                                       GPBFileSyntax syntax) {
   GPBOneofDescriptor *oneof = field->containingOneof_;
   if (oneof) {
-    GPBMaybeClearOneof(self, oneof, GPBFieldNumber(field));
+    GPBMessageFieldDescription *fieldDesc = field->description_;
+    GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
   }
   NSCAssert(self->messageStorage_ != NULL,
             @"%@: All messages should have storage (from init)",
@@ -601,7 +602,8 @@
                                        GPBFileSyntax syntax) {
   GPBOneofDescriptor *oneof = field->containingOneof_;
   if (oneof) {
-    GPBMaybeClearOneof(self, oneof, GPBFieldNumber(field));
+    GPBMessageFieldDescription *fieldDesc = field->description_;
+    GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
   }
   NSCAssert(self->messageStorage_ != NULL,
             @"%@: All messages should have storage (from init)",
@@ -649,7 +651,8 @@
                                       GPBFileSyntax syntax) {
   GPBOneofDescriptor *oneof = field->containingOneof_;
   if (oneof) {
-    GPBMaybeClearOneof(self, oneof, GPBFieldNumber(field));
+    GPBMessageFieldDescription *fieldDesc = field->description_;
+    GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
   }
   NSCAssert(self->messageStorage_ != NULL,
             @"%@: All messages should have storage (from init)",
@@ -697,7 +700,8 @@
                                        GPBFileSyntax syntax) {
   GPBOneofDescriptor *oneof = field->containingOneof_;
   if (oneof) {
-    GPBMaybeClearOneof(self, oneof, GPBFieldNumber(field));
+    GPBMessageFieldDescription *fieldDesc = field->description_;
+    GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
   }
   NSCAssert(self->messageStorage_ != NULL,
             @"%@: All messages should have storage (from init)",
@@ -745,7 +749,8 @@
                                       GPBFileSyntax syntax) {
   GPBOneofDescriptor *oneof = field->containingOneof_;
   if (oneof) {
-    GPBMaybeClearOneof(self, oneof, GPBFieldNumber(field));
+    GPBMessageFieldDescription *fieldDesc = field->description_;
+    GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
   }
   NSCAssert(self->messageStorage_ != NULL,
             @"%@: All messages should have storage (from init)",
@@ -793,7 +798,8 @@
                                        GPBFileSyntax syntax) {
   GPBOneofDescriptor *oneof = field->containingOneof_;
   if (oneof) {
-    GPBMaybeClearOneof(self, oneof, GPBFieldNumber(field));
+    GPBMessageFieldDescription *fieldDesc = field->description_;
+    GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
   }
   NSCAssert(self->messageStorage_ != NULL,
             @"%@: All messages should have storage (from init)",
@@ -812,7 +818,7 @@
   GPBBecomeVisibleToAutocreator(self);
 }
 
-//%PDDM-EXPAND-END (7 expansions)
+//%PDDM-EXPAND-END (6 expansions)
 
 // Aliases are function calls that are virtually the same.
 
diff --git a/objectivec/GPBUtilities_PackagePrivate.h b/objectivec/GPBUtilities_PackagePrivate.h
index cac551f..a6b6c84 100644
--- a/objectivec/GPBUtilities_PackagePrivate.h
+++ b/objectivec/GPBUtilities_PackagePrivate.h
@@ -185,7 +185,7 @@
 }
 
 void GPBMaybeClearOneof(GPBMessage *self, GPBOneofDescriptor *oneof,
-                        uint32_t fieldNumberNotToClear);
+                        int32_t oneofHasIndex, uint32_t fieldNumberNotToClear);
 
 //%PDDM-DEFINE GPB_IVAR_SET_DECL(NAME, TYPE)
 //%void GPBSet##NAME##IvarWithFieldInternal(GPBMessage *self,
diff --git a/objectivec/ProtocolBuffers_OSX.xcodeproj/project.pbxproj b/objectivec/ProtocolBuffers_OSX.xcodeproj/project.pbxproj
index 78c3f9b..3093425 100644
--- a/objectivec/ProtocolBuffers_OSX.xcodeproj/project.pbxproj
+++ b/objectivec/ProtocolBuffers_OSX.xcodeproj/project.pbxproj
@@ -7,7 +7,6 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
-		2CFB390415C718CE00CBF84D /* Descriptor.pbobjc.m in Sources */ = {isa = PBXBuildFile; fileRef = 8BD3982214BE5B0C0081D629 /* Descriptor.pbobjc.m */; };
 		5102DABC1891A073002037B6 /* GPBConcurrencyTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 5102DABB1891A052002037B6 /* GPBConcurrencyTests.m */; };
 		7461B5360F94FB4600A0C422 /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 1D30AB110D05D00D00671497 /* Foundation.framework */; };
 		7461B53C0F94FB4E00A0C422 /* GPBCodedInputStream.m in Sources */ = {isa = PBXBuildFile; fileRef = 7461B48F0F94F99000A0C422 /* GPBCodedInputStream.m */; };
@@ -27,7 +26,6 @@
 		8B79657D14992E3F002FFBFC /* GPBRootObject.m in Sources */ = {isa = PBXBuildFile; fileRef = 8B79657914992E3E002FFBFC /* GPBRootObject.m */; };
 		8B8B615D17DF7056002EE618 /* GPBARCUnittestProtos.m in Sources */ = {isa = PBXBuildFile; fileRef = 8B8B615C17DF7056002EE618 /* GPBARCUnittestProtos.m */; settings = {COMPILER_FLAGS = "-fobjc-arc"; }; };
 		8B96157414C8C38C00A2AC0B /* GPBDescriptor.m in Sources */ = {isa = PBXBuildFile; fileRef = 8B96157314C8C38C00A2AC0B /* GPBDescriptor.m */; };
-		8B96157514CA019D00A2AC0B /* Descriptor.pbobjc.m in Sources */ = {isa = PBXBuildFile; fileRef = 8BD3982214BE5B0C0081D629 /* Descriptor.pbobjc.m */; };
 		8BBEA4A9147C727D00C4ADB7 /* GPBCodedInputStreamTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 7461B69B0F94FDF800A0C422 /* GPBCodedInputStreamTests.m */; };
 		8BBEA4AA147C727D00C4ADB7 /* GPBCodedOuputStreamTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 7461B69D0F94FDF800A0C422 /* GPBCodedOuputStreamTests.m */; };
 		8BBEA4AC147C727D00C4ADB7 /* GPBMessageTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 7461B6A30F94FDF800A0C422 /* GPBMessageTests.m */; };
@@ -140,10 +138,8 @@
 		8B4248D51A92826400BC1EC6 /* Timestamp.pbobjc.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = Timestamp.pbobjc.h; path = google/protobuf/Timestamp.pbobjc.h; sourceTree = "<group>"; };
 		8B4248D61A92826400BC1EC6 /* Timestamp.pbobjc.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = Timestamp.pbobjc.m; path = google/protobuf/Timestamp.pbobjc.m; sourceTree = "<group>"; };
 		8B4248DB1A92933A00BC1EC6 /* GPBWellKnownTypesTest.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBWellKnownTypesTest.m; sourceTree = "<group>"; };
-		8B42494B1A92A16600BC1EC6 /* descriptor.proto */ = {isa = PBXFileReference; lastKnownFileType = text; name = descriptor.proto; path = ../src/google/protobuf/descriptor.proto; sourceTree = "<group>"; };
 		8B42494C1A92A16600BC1EC6 /* duration.proto */ = {isa = PBXFileReference; lastKnownFileType = text; name = duration.proto; path = ../src/google/protobuf/duration.proto; sourceTree = "<group>"; };
 		8B42494D1A92A16600BC1EC6 /* timestamp.proto */ = {isa = PBXFileReference; lastKnownFileType = text; name = timestamp.proto; path = ../src/google/protobuf/timestamp.proto; sourceTree = "<group>"; };
-		8B54585814DCC34E003D7338 /* Descriptor.pbobjc.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = Descriptor.pbobjc.h; path = google/protobuf/Descriptor.pbobjc.h; sourceTree = SOURCE_ROOT; };
 		8B79657814992E3E002FFBFC /* GPBRootObject.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = GPBRootObject.h; sourceTree = "<group>"; };
 		8B79657914992E3E002FFBFC /* GPBRootObject.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBRootObject.m; sourceTree = "<group>"; };
 		8B7E6A7414893DBA00F8884A /* unittest_custom_options.proto */ = {isa = PBXFileReference; lastKnownFileType = text; name = unittest_custom_options.proto; path = ../../src/google/protobuf/unittest_custom_options.proto; sourceTree = "<group>"; };
@@ -162,7 +158,6 @@
 		8BCF338814ED799900BC5317 /* GPBProtocolBuffers.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = GPBProtocolBuffers.m; sourceTree = "<group>"; };
 		8BD3981D14BE54220081D629 /* unittest_enormous_descriptor.proto */ = {isa = PBXFileReference; lastKnownFileType = text; name = unittest_enormous_descriptor.proto; path = ../../src/google/protobuf/unittest_enormous_descriptor.proto; sourceTree = "<group>"; };
 		8BD3981E14BE59D70081D629 /* GPBUnittestProtos.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBUnittestProtos.m; sourceTree = "<group>"; };
-		8BD3982214BE5B0C0081D629 /* Descriptor.pbobjc.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = Descriptor.pbobjc.m; path = google/protobuf/Descriptor.pbobjc.m; sourceTree = SOURCE_ROOT; };
 		8BEB5AE01498033E0078BF9D /* GPBRuntimeTypes.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GPBRuntimeTypes.h; sourceTree = "<group>"; };
 		F401DC2A1A8D444600FCC765 /* GPBArray.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = GPBArray.h; sourceTree = "<group>"; };
 		F401DC2B1A8D444600FCC765 /* GPBArray.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBArray.m; sourceTree = "<group>"; };
@@ -300,9 +295,6 @@
 				F4E675881B21D0000054530B /* Api.pbobjc.h */,
 				F4E675891B21D0000054530B /* Api.pbobjc.m */,
 				F4E675A71B21D05C0054530B /* api.proto */,
-				8B54585814DCC34E003D7338 /* Descriptor.pbobjc.h */,
-				8BD3982214BE5B0C0081D629 /* Descriptor.pbobjc.m */,
-				8B42494B1A92A16600BC1EC6 /* descriptor.proto */,
 				8B4248D31A92826400BC1EC6 /* Duration.pbobjc.h */,
 				8B4248D41A92826400BC1EC6 /* Duration.pbobjc.m */,
 				8B42494C1A92A16600BC1EC6 /* duration.proto */,
@@ -634,7 +626,6 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				2CFB390415C718CE00CBF84D /* Descriptor.pbobjc.m in Sources */,
 				7461B53C0F94FB4E00A0C422 /* GPBCodedInputStream.m in Sources */,
 				F4E6759B1B21D0000054530B /* Empty.pbobjc.m in Sources */,
 				7461B53D0F94FB4E00A0C422 /* GPBCodedOutputStream.m in Sources */,
@@ -696,7 +687,6 @@
 				8B79657D14992E3F002FFBFC /* GPBRootObject.m in Sources */,
 				8BD3981F14BE59D70081D629 /* GPBUnittestProtos.m in Sources */,
 				F4E675B11B21D0A70054530B /* FieldMask.pbobjc.m in Sources */,
-				8B96157514CA019D00A2AC0B /* Descriptor.pbobjc.m in Sources */,
 				8B8B615D17DF7056002EE618 /* GPBARCUnittestProtos.m in Sources */,
 				F4E675AF1B21D0A70054530B /* Api.pbobjc.m in Sources */,
 			);
diff --git a/objectivec/ProtocolBuffers_iOS.xcodeproj/project.pbxproj b/objectivec/ProtocolBuffers_iOS.xcodeproj/project.pbxproj
index 5d96c05..b622181 100644
--- a/objectivec/ProtocolBuffers_iOS.xcodeproj/project.pbxproj
+++ b/objectivec/ProtocolBuffers_iOS.xcodeproj/project.pbxproj
@@ -7,7 +7,6 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
-		2CFB390415C718CE00CBF84D /* Descriptor.pbobjc.m in Sources */ = {isa = PBXBuildFile; fileRef = 8BD3982214BE5B0C0081D629 /* Descriptor.pbobjc.m */; };
 		5102DABC1891A073002037B6 /* GPBConcurrencyTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 5102DABB1891A052002037B6 /* GPBConcurrencyTests.m */; };
 		7461B5360F94FB4600A0C422 /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 1D30AB110D05D00D00671497 /* Foundation.framework */; };
 		7461B53C0F94FB4E00A0C422 /* GPBCodedInputStream.m in Sources */ = {isa = PBXBuildFile; fileRef = 7461B48F0F94F99000A0C422 /* GPBCodedInputStream.m */; };
@@ -27,7 +26,6 @@
 		8B79657D14992E3F002FFBFC /* GPBRootObject.m in Sources */ = {isa = PBXBuildFile; fileRef = 8B79657914992E3E002FFBFC /* GPBRootObject.m */; };
 		8B8B615D17DF7056002EE618 /* GPBARCUnittestProtos.m in Sources */ = {isa = PBXBuildFile; fileRef = 8B8B615C17DF7056002EE618 /* GPBARCUnittestProtos.m */; settings = {COMPILER_FLAGS = "-fobjc-arc"; }; };
 		8B96157414C8C38C00A2AC0B /* GPBDescriptor.m in Sources */ = {isa = PBXBuildFile; fileRef = 8B96157314C8C38C00A2AC0B /* GPBDescriptor.m */; };
-		8B96157514CA019D00A2AC0B /* Descriptor.pbobjc.m in Sources */ = {isa = PBXBuildFile; fileRef = 8BD3982214BE5B0C0081D629 /* Descriptor.pbobjc.m */; };
 		8B9742331A89D19F00DCE92C /* LaunchScreen.xib in Resources */ = {isa = PBXBuildFile; fileRef = 8B9742321A89D19F00DCE92C /* LaunchScreen.xib */; };
 		8B9742431A8AAA7800DCE92C /* CoreGraphics.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 8B9742421A8AAA7800DCE92C /* CoreGraphics.framework */; };
 		8B9A5EA61831993600A9D33B /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 1D30AB110D05D00D00671497 /* Foundation.framework */; };
@@ -155,7 +153,6 @@
 		8B4248E21A929C8900BC1EC6 /* GPBWellKnownTypes.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBWellKnownTypes.m; sourceTree = "<group>"; };
 		8B4248E51A929C9900BC1EC6 /* GPBWellKnownTypesTest.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBWellKnownTypesTest.m; sourceTree = "<group>"; };
 		8B4249481A92A02300BC1EC6 /* timestamp.proto */ = {isa = PBXFileReference; lastKnownFileType = text; name = timestamp.proto; path = ../src/google/protobuf/timestamp.proto; sourceTree = "<group>"; };
-		8B4249491A92A0BA00BC1EC6 /* descriptor.proto */ = {isa = PBXFileReference; lastKnownFileType = text; name = descriptor.proto; path = ../src/google/protobuf/descriptor.proto; sourceTree = "<group>"; };
 		8B42494A1A92A0BA00BC1EC6 /* duration.proto */ = {isa = PBXFileReference; lastKnownFileType = text; name = duration.proto; path = ../src/google/protobuf/duration.proto; sourceTree = "<group>"; };
 		8B79657814992E3E002FFBFC /* GPBRootObject.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = GPBRootObject.h; sourceTree = "<group>"; };
 		8B79657914992E3E002FFBFC /* GPBRootObject.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBRootObject.m; sourceTree = "<group>"; };
@@ -183,7 +180,6 @@
 		8BCF338814ED799900BC5317 /* GPBProtocolBuffers.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = GPBProtocolBuffers.m; sourceTree = "<group>"; };
 		8BD3981D14BE54220081D629 /* unittest_enormous_descriptor.proto */ = {isa = PBXFileReference; lastKnownFileType = text; name = unittest_enormous_descriptor.proto; path = ../../src/google/protobuf/unittest_enormous_descriptor.proto; sourceTree = "<group>"; };
 		8BD3981E14BE59D70081D629 /* GPBUnittestProtos.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBUnittestProtos.m; sourceTree = "<group>"; };
-		8BD3982214BE5B0C0081D629 /* Descriptor.pbobjc.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = Descriptor.pbobjc.m; path = google/protobuf/Descriptor.pbobjc.m; sourceTree = SOURCE_ROOT; };
 		8BEB5AE01498033E0078BF9D /* GPBRuntimeTypes.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GPBRuntimeTypes.h; sourceTree = "<group>"; };
 		F401DC341A8E5C6F00FCC765 /* GPBArrayTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBArrayTests.m; sourceTree = "<group>"; };
 		F41C175C1833D3310064ED4D /* GPBPerfTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBPerfTests.m; sourceTree = "<group>"; };
@@ -224,7 +220,6 @@
 		F4E675B71B21D1440054530B /* Any.pbobjc.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; name = Any.pbobjc.m; path = google/protobuf/Any.pbobjc.m; sourceTree = "<group>"; };
 		F4E675B81B21D1440054530B /* Api.pbobjc.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = Api.pbobjc.h; path = google/protobuf/Api.pbobjc.h; sourceTree = "<group>"; };
 		F4E675B91B21D1440054530B /* Api.pbobjc.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; name = Api.pbobjc.m; path = google/protobuf/Api.pbobjc.m; sourceTree = "<group>"; };
-		F4E675BA1B21D1440054530B /* Descriptor.pbobjc.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = Descriptor.pbobjc.h; path = google/protobuf/Descriptor.pbobjc.h; sourceTree = "<group>"; };
 		F4E675BB1B21D1440054530B /* Empty.pbobjc.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = Empty.pbobjc.h; path = google/protobuf/Empty.pbobjc.h; sourceTree = "<group>"; };
 		F4E675BC1B21D1440054530B /* Empty.pbobjc.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; name = Empty.pbobjc.m; path = google/protobuf/Empty.pbobjc.m; sourceTree = "<group>"; };
 		F4E675BD1B21D1440054530B /* FieldMask.pbobjc.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = FieldMask.pbobjc.h; path = google/protobuf/FieldMask.pbobjc.h; sourceTree = "<group>"; };
@@ -335,9 +330,6 @@
 				F4E675B81B21D1440054530B /* Api.pbobjc.h */,
 				F4E675B91B21D1440054530B /* Api.pbobjc.m */,
 				F4E675D91B21D1DE0054530B /* api.proto */,
-				F4E675BA1B21D1440054530B /* Descriptor.pbobjc.h */,
-				8BD3982214BE5B0C0081D629 /* Descriptor.pbobjc.m */,
-				8B4249491A92A0BA00BC1EC6 /* descriptor.proto */,
 				8B4248DD1A929C7D00BC1EC6 /* Duration.pbobjc.h */,
 				8B4248DE1A929C7D00BC1EC6 /* Duration.pbobjc.m */,
 				8B42494A1A92A0BA00BC1EC6 /* duration.proto */,
@@ -722,7 +714,6 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				2CFB390415C718CE00CBF84D /* Descriptor.pbobjc.m in Sources */,
 				7461B53C0F94FB4E00A0C422 /* GPBCodedInputStream.m in Sources */,
 				F4E675D21B21D1620054530B /* Empty.pbobjc.m in Sources */,
 				F4487C731A9F906200531423 /* GPBArray.m in Sources */,
@@ -792,7 +783,6 @@
 				8B79657D14992E3F002FFBFC /* GPBRootObject.m in Sources */,
 				8BD3981F14BE59D70081D629 /* GPBUnittestProtos.m in Sources */,
 				F4E675CB1B21D1610054530B /* FieldMask.pbobjc.m in Sources */,
-				8B96157514CA019D00A2AC0B /* Descriptor.pbobjc.m in Sources */,
 				8B8B615D17DF7056002EE618 /* GPBARCUnittestProtos.m in Sources */,
 				F4E675C91B21D1610054530B /* Api.pbobjc.m in Sources */,
 			);
diff --git a/objectivec/Tests/GPBARCUnittestProtos.m b/objectivec/Tests/GPBARCUnittestProtos.m
index d040886..28d2396 100644
--- a/objectivec/Tests/GPBARCUnittestProtos.m
+++ b/objectivec/Tests/GPBARCUnittestProtos.m
@@ -34,6 +34,11 @@
 
 // Makes sure all the generated headers compile with ARC on.
 
+// The unittest_custom_options.proto extends the messages in descriptor.proto
+// so we build it in to test extending in general. The library doesn't provide
+// a descriptor as it doesn't use the classes/enums.
+#import "google/protobuf/Descriptor.pbobjc.h"
+
 #import "google/protobuf/Unittest.pbobjc.h"
 #import "google/protobuf/UnittestCustomOptions.pbobjc.h"
 #import "google/protobuf/UnittestCycle.pbobjc.h"
diff --git a/objectivec/Tests/GPBDescriptorTests.m b/objectivec/Tests/GPBDescriptorTests.m
index ccdbb64..a1923c9 100644
--- a/objectivec/Tests/GPBDescriptorTests.m
+++ b/objectivec/Tests/GPBDescriptorTests.m
@@ -153,19 +153,6 @@
   XCTAssertFalse([fieldDescriptor isValidEnumValue:-2]);
 }
 
-- (void)testEnumDescriptorLookup {
-  GPBDescriptor *descriptor = [TestAllTypes descriptor];
-  GPBEnumDescriptor *enumDescriptor =
-      [descriptor enumWithName:@"TestAllTypes_NestedEnum"];
-  XCTAssertNotNil(enumDescriptor);
-
-  // Descriptor cannot find foreign or imported enums.
-  enumDescriptor = [descriptor enumWithName:@"ForeignEnumEnum"];
-  XCTAssertNil(enumDescriptor);
-  enumDescriptor = [descriptor enumWithName:@"ImportEnumEnum"];
-  XCTAssertNil(enumDescriptor);
-}
-
 - (void)testOneofDescriptor {
   GPBDescriptor *descriptor = [TestOneof2 descriptor];
 
diff --git a/objectivec/Tests/GPBUnittestProtos.m b/objectivec/Tests/GPBUnittestProtos.m
index 50c4dfa..d19beee 100644
--- a/objectivec/Tests/GPBUnittestProtos.m
+++ b/objectivec/Tests/GPBUnittestProtos.m
@@ -31,6 +31,11 @@
 // Collects all the compiled protos into one file and compiles them to make sure
 // the compiler is generating valid code.
 
+// The unittest_custom_options.proto extends the messages in descriptor.proto
+// so we build it in to test extending in general. The library doesn't provide
+// a descriptor as it doesn't use the classes/enums.
+#import "google/protobuf/Descriptor.pbobjc.m"
+
 #import "google/protobuf/MapProto2Unittest.pbobjc.m"
 #import "google/protobuf/MapUnittest.pbobjc.m"
 #import "google/protobuf/Unittest.pbobjc.m"
diff --git a/objectivec/generate_descriptors_proto.sh b/objectivec/generate_well_known_types.sh
similarity index 85%
rename from objectivec/generate_descriptors_proto.sh
rename to objectivec/generate_well_known_types.sh
index 84ba073..be9b38a 100755
--- a/objectivec/generate_descriptors_proto.sh
+++ b/objectivec/generate_well_known_types.sh
@@ -1,9 +1,9 @@
 #!/bin/bash
 
-# Run this script to regenerate descriptor.pbobjc.{h,m} after the protocol
-# compiler changes.
+# Run this script to regenerate *.pbobjc.{h,m} for the well known types after
+# the protocol compiler changes.
 
-# HINT:  Flags passed to generate_descriptor_proto.sh will be passed directly
+# HINT:  Flags passed to generate_well_known_types.sh will be passed directly
 #   to make when building protoc.  This is particularly useful for passing
 #   -j4 to run 4 jobs simultaneously.
 
@@ -37,7 +37,6 @@
 declare -a RUNTIME_PROTO_FILES=( \
   google/protobuf/any.proto \
   google/protobuf/api.proto \
-  google/protobuf/descriptor.proto \
   google/protobuf/duration.proto \
   google/protobuf/empty.proto \
   google/protobuf/field_mask.proto \
diff --git a/objectivec/google/protobuf/Any.pbobjc.h b/objectivec/google/protobuf/Any.pbobjc.h
index a204ae9..79ec0fb 100644
--- a/objectivec/google/protobuf/Any.pbobjc.h
+++ b/objectivec/google/protobuf/Any.pbobjc.h
@@ -3,7 +3,7 @@
 
 #import "GPBProtocolBuffers.h"
 
-#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
+#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30001
 #error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
diff --git a/objectivec/google/protobuf/Any.pbobjc.m b/objectivec/google/protobuf/Any.pbobjc.m
index b41102a..7cbf0de 100644
--- a/objectivec/google/protobuf/Any.pbobjc.m
+++ b/objectivec/google/protobuf/Any.pbobjc.m
@@ -46,47 +46,36 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "typeURL",
+        .dataTypeSpecific.className = NULL,
         .number = GPBAny_FieldNumber_TypeURL,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBAny__storage_, typeURL),
         .flags = GPBFieldOptional | GPBFieldTextFormatNameCustom,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBAny__storage_, typeURL),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "value",
+        .dataTypeSpecific.className = NULL,
         .number = GPBAny_FieldNumber_Value,
         .hasIndex = 1,
+        .offset = (uint32_t)offsetof(GPBAny__storage_, value),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeBytes,
-        .offset = offsetof(GPBAny__storage_, value),
-        .defaultValue.valueData = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
-#if GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS
-    const char *extraTextFormatInfo = NULL;
-#else
-    static const char *extraTextFormatInfo = "\001\001\004\241!!\000";
-#endif  // GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS
     GPBDescriptor *localDescriptor =
         [GPBDescriptor allocDescriptorForClass:[GPBAny class]
                                      rootClass:[GPBAnyRoot class]
                                           file:GPBAnyRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBAny__storage_)
-                                    wireFormat:NO
-                           extraTextFormatInfo:extraTextFormatInfo];
+                                         flags:0];
+#if !GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS
+    static const char *extraTextFormatInfo =
+        "\001\001\004\241!!\000";
+    [localDescriptor setupExtraTextInfo:extraTextFormatInfo];
+#endif  // !GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
diff --git a/objectivec/google/protobuf/Api.pbobjc.h b/objectivec/google/protobuf/Api.pbobjc.h
index 271a166..3f7e99c 100644
--- a/objectivec/google/protobuf/Api.pbobjc.h
+++ b/objectivec/google/protobuf/Api.pbobjc.h
@@ -3,7 +3,7 @@
 
 #import "GPBProtocolBuffers.h"
 
-#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
+#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30001
 #error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
diff --git a/objectivec/google/protobuf/Api.pbobjc.m b/objectivec/google/protobuf/Api.pbobjc.m
index d964ff4..2b2f62e 100644
--- a/objectivec/google/protobuf/Api.pbobjc.m
+++ b/objectivec/google/protobuf/Api.pbobjc.m
@@ -71,80 +71,66 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "name",
+        .dataTypeSpecific.className = NULL,
         .number = GPBApi_FieldNumber_Name,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBApi__storage_, name),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBApi__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "methodsArray",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBMethod),
         .number = GPBApi_FieldNumber_MethodsArray,
         .hasIndex = GPBNoHasBit,
+        .offset = (uint32_t)offsetof(GPBApi__storage_, methodsArray),
         .flags = GPBFieldRepeated,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBApi__storage_, methodsArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBMethod),
-        .fieldOptions = NULL,
       },
       {
         .name = "optionsArray",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBOption),
         .number = GPBApi_FieldNumber_OptionsArray,
         .hasIndex = GPBNoHasBit,
+        .offset = (uint32_t)offsetof(GPBApi__storage_, optionsArray),
         .flags = GPBFieldRepeated,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBApi__storage_, optionsArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBOption),
-        .fieldOptions = NULL,
       },
       {
         .name = "version",
+        .dataTypeSpecific.className = NULL,
         .number = GPBApi_FieldNumber_Version,
-        .hasIndex = 3,
+        .hasIndex = 1,
+        .offset = (uint32_t)offsetof(GPBApi__storage_, version),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBApi__storage_, version),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "sourceContext",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBSourceContext),
         .number = GPBApi_FieldNumber_SourceContext,
-        .hasIndex = 4,
+        .hasIndex = 2,
+        .offset = (uint32_t)offsetof(GPBApi__storage_, sourceContext),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBApi__storage_, sourceContext),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBSourceContext),
-        .fieldOptions = NULL,
       },
       {
         .name = "mixinsArray",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBMixin),
         .number = GPBApi_FieldNumber_MixinsArray,
         .hasIndex = GPBNoHasBit,
+        .offset = (uint32_t)offsetof(GPBApi__storage_, mixinsArray),
         .flags = GPBFieldRepeated,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBApi__storage_, mixinsArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBMixin),
-        .fieldOptions = NULL,
       },
       {
         .name = "syntax",
+        .dataTypeSpecific.enumDescFunc = GPBSyntax_EnumDescriptor,
         .number = GPBApi_FieldNumber_Syntax,
-        .hasIndex = 6,
+        .hasIndex = 3,
+        .offset = (uint32_t)offsetof(GPBApi__storage_, syntax),
         .flags = GPBFieldOptional | GPBFieldHasEnumDescriptor,
         .dataType = GPBDataTypeEnum,
-        .offset = offsetof(GPBApi__storage_, syntax),
-        .defaultValue.valueEnum = GPBSyntax_SyntaxProto2,
-        .dataTypeSpecific.enumDescFunc = GPBSyntax_EnumDescriptor,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -152,15 +138,9 @@
                                      rootClass:[GPBApiRoot class]
                                           file:GPBApiRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBApi__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -195,8 +175,6 @@
 
 typedef struct GPBMethod__storage_ {
   uint32_t _has_storage_[1];
-  BOOL requestStreaming;
-  BOOL responseStreaming;
   GPBSyntax syntax;
   NSString *name;
   NSString *requestTypeURL;
@@ -212,102 +190,81 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "name",
+        .dataTypeSpecific.className = NULL,
         .number = GPBMethod_FieldNumber_Name,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBMethod__storage_, name),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBMethod__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "requestTypeURL",
+        .dataTypeSpecific.className = NULL,
         .number = GPBMethod_FieldNumber_RequestTypeURL,
         .hasIndex = 1,
+        .offset = (uint32_t)offsetof(GPBMethod__storage_, requestTypeURL),
         .flags = GPBFieldOptional | GPBFieldTextFormatNameCustom,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBMethod__storage_, requestTypeURL),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "requestStreaming",
+        .dataTypeSpecific.className = NULL,
         .number = GPBMethod_FieldNumber_RequestStreaming,
         .hasIndex = 2,
+        .offset = 3,  // Stored in _has_storage_ to save space.
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBMethod__storage_, requestStreaming),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "responseTypeURL",
+        .dataTypeSpecific.className = NULL,
         .number = GPBMethod_FieldNumber_ResponseTypeURL,
-        .hasIndex = 3,
+        .hasIndex = 4,
+        .offset = (uint32_t)offsetof(GPBMethod__storage_, responseTypeURL),
         .flags = GPBFieldOptional | GPBFieldTextFormatNameCustom,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBMethod__storage_, responseTypeURL),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "responseStreaming",
+        .dataTypeSpecific.className = NULL,
         .number = GPBMethod_FieldNumber_ResponseStreaming,
-        .hasIndex = 4,
+        .hasIndex = 5,
+        .offset = 6,  // Stored in _has_storage_ to save space.
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBMethod__storage_, responseStreaming),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "optionsArray",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBOption),
         .number = GPBMethod_FieldNumber_OptionsArray,
         .hasIndex = GPBNoHasBit,
+        .offset = (uint32_t)offsetof(GPBMethod__storage_, optionsArray),
         .flags = GPBFieldRepeated,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBMethod__storage_, optionsArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBOption),
-        .fieldOptions = NULL,
       },
       {
         .name = "syntax",
+        .dataTypeSpecific.enumDescFunc = GPBSyntax_EnumDescriptor,
         .number = GPBMethod_FieldNumber_Syntax,
-        .hasIndex = 6,
+        .hasIndex = 7,
+        .offset = (uint32_t)offsetof(GPBMethod__storage_, syntax),
         .flags = GPBFieldOptional | GPBFieldHasEnumDescriptor,
         .dataType = GPBDataTypeEnum,
-        .offset = offsetof(GPBMethod__storage_, syntax),
-        .defaultValue.valueEnum = GPBSyntax_SyntaxProto2,
-        .dataTypeSpecific.enumDescFunc = GPBSyntax_EnumDescriptor,
-        .fieldOptions = NULL,
       },
     };
-#if GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS
-    const char *extraTextFormatInfo = NULL;
-#else
-    static const char *extraTextFormatInfo = "\002\002\007\244\241!!\000\004\010\244\241!!\000";
-#endif  // GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS
     GPBDescriptor *localDescriptor =
         [GPBDescriptor allocDescriptorForClass:[GPBMethod class]
                                      rootClass:[GPBApiRoot class]
                                           file:GPBApiRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBMethod__storage_)
-                                    wireFormat:NO
-                           extraTextFormatInfo:extraTextFormatInfo];
+                                         flags:0];
+#if !GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS
+    static const char *extraTextFormatInfo =
+        "\002\002\007\244\241!!\000\004\010\244\241!!\000";
+    [localDescriptor setupExtraTextInfo:extraTextFormatInfo];
+#endif  // !GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -349,25 +306,21 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "name",
+        .dataTypeSpecific.className = NULL,
         .number = GPBMixin_FieldNumber_Name,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBMixin__storage_, name),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBMixin__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "root",
+        .dataTypeSpecific.className = NULL,
         .number = GPBMixin_FieldNumber_Root,
         .hasIndex = 1,
+        .offset = (uint32_t)offsetof(GPBMixin__storage_, root),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBMixin__storage_, root),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -375,15 +328,9 @@
                                      rootClass:[GPBApiRoot class]
                                           file:GPBApiRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBMixin__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
diff --git a/objectivec/google/protobuf/Descriptor.pbobjc.h b/objectivec/google/protobuf/Descriptor.pbobjc.h
deleted file mode 100644
index 109711c..0000000
--- a/objectivec/google/protobuf/Descriptor.pbobjc.h
+++ /dev/null
@@ -1,1279 +0,0 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/descriptor.proto
-
-#import "GPBProtocolBuffers.h"
-
-#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
-#error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
-#endif
-
-// @@protoc_insertion_point(imports)
-
-CF_EXTERN_C_BEGIN
-
-@class GPBDescriptorProto;
-@class GPBDescriptorProto_ExtensionRange;
-@class GPBDescriptorProto_ReservedRange;
-@class GPBEnumDescriptorProto;
-@class GPBEnumOptions;
-@class GPBEnumValueDescriptorProto;
-@class GPBEnumValueOptions;
-@class GPBFieldDescriptorProto;
-@class GPBFieldOptions;
-@class GPBFileDescriptorProto;
-@class GPBFileOptions;
-@class GPBGeneratedCodeInfo_Annotation;
-@class GPBMessageOptions;
-@class GPBMethodDescriptorProto;
-@class GPBMethodOptions;
-@class GPBOneofDescriptorProto;
-@class GPBServiceDescriptorProto;
-@class GPBServiceOptions;
-@class GPBSourceCodeInfo;
-@class GPBSourceCodeInfo_Location;
-@class GPBUninterpretedOption;
-@class GPBUninterpretedOption_NamePart;
-
-NS_ASSUME_NONNULL_BEGIN
-
-#pragma mark - Enum GPBFieldDescriptorProto_Type
-
-typedef GPB_ENUM(GPBFieldDescriptorProto_Type) {
-  /// 0 is reserved for errors.
-  /// Order is weird for historical reasons.
-  GPBFieldDescriptorProto_Type_TypeDouble = 1,
-  GPBFieldDescriptorProto_Type_TypeFloat = 2,
-
-  /// Not ZigZag encoded.  Negative numbers take 10 bytes.  Use TYPE_SINT64 if
-  /// negative values are likely.
-  GPBFieldDescriptorProto_Type_TypeInt64 = 3,
-  GPBFieldDescriptorProto_Type_TypeUint64 = 4,
-
-  /// Not ZigZag encoded.  Negative numbers take 10 bytes.  Use TYPE_SINT32 if
-  /// negative values are likely.
-  GPBFieldDescriptorProto_Type_TypeInt32 = 5,
-  GPBFieldDescriptorProto_Type_TypeFixed64 = 6,
-  GPBFieldDescriptorProto_Type_TypeFixed32 = 7,
-  GPBFieldDescriptorProto_Type_TypeBool = 8,
-  GPBFieldDescriptorProto_Type_TypeString = 9,
-
-  /// Tag-delimited aggregate.
-  GPBFieldDescriptorProto_Type_TypeGroup = 10,
-
-  /// Length-delimited aggregate.
-  GPBFieldDescriptorProto_Type_TypeMessage = 11,
-
-  /// New in version 2.
-  GPBFieldDescriptorProto_Type_TypeBytes = 12,
-  GPBFieldDescriptorProto_Type_TypeUint32 = 13,
-  GPBFieldDescriptorProto_Type_TypeEnum = 14,
-  GPBFieldDescriptorProto_Type_TypeSfixed32 = 15,
-  GPBFieldDescriptorProto_Type_TypeSfixed64 = 16,
-
-  /// Uses ZigZag encoding.
-  GPBFieldDescriptorProto_Type_TypeSint32 = 17,
-
-  /// Uses ZigZag encoding.
-  GPBFieldDescriptorProto_Type_TypeSint64 = 18,
-};
-
-GPBEnumDescriptor *GPBFieldDescriptorProto_Type_EnumDescriptor(void);
-
-/// Checks to see if the given value is defined by the enum or was not known at
-/// the time this source was generated.
-BOOL GPBFieldDescriptorProto_Type_IsValidValue(int32_t value);
-
-#pragma mark - Enum GPBFieldDescriptorProto_Label
-
-typedef GPB_ENUM(GPBFieldDescriptorProto_Label) {
-  /// 0 is reserved for errors
-  GPBFieldDescriptorProto_Label_LabelOptional = 1,
-  GPBFieldDescriptorProto_Label_LabelRequired = 2,
-
-  /// TODO(sanjay): Should we add LABEL_MAP?
-  GPBFieldDescriptorProto_Label_LabelRepeated = 3,
-};
-
-GPBEnumDescriptor *GPBFieldDescriptorProto_Label_EnumDescriptor(void);
-
-/// Checks to see if the given value is defined by the enum or was not known at
-/// the time this source was generated.
-BOOL GPBFieldDescriptorProto_Label_IsValidValue(int32_t value);
-
-#pragma mark - Enum GPBFileOptions_OptimizeMode
-
-/// Generated classes can be optimized for speed or code size.
-typedef GPB_ENUM(GPBFileOptions_OptimizeMode) {
-  /// Generate complete code for parsing, serialization,
-  GPBFileOptions_OptimizeMode_Speed = 1,
-
-  /// etc.
-  GPBFileOptions_OptimizeMode_CodeSize = 2,
-
-  /// Generate code using MessageLite and the lite runtime.
-  GPBFileOptions_OptimizeMode_LiteRuntime = 3,
-};
-
-GPBEnumDescriptor *GPBFileOptions_OptimizeMode_EnumDescriptor(void);
-
-/// Checks to see if the given value is defined by the enum or was not known at
-/// the time this source was generated.
-BOOL GPBFileOptions_OptimizeMode_IsValidValue(int32_t value);
-
-#pragma mark - Enum GPBFieldOptions_CType
-
-typedef GPB_ENUM(GPBFieldOptions_CType) {
-  /// Default mode.
-  GPBFieldOptions_CType_String = 0,
-  GPBFieldOptions_CType_Cord = 1,
-  GPBFieldOptions_CType_StringPiece = 2,
-};
-
-GPBEnumDescriptor *GPBFieldOptions_CType_EnumDescriptor(void);
-
-/// Checks to see if the given value is defined by the enum or was not known at
-/// the time this source was generated.
-BOOL GPBFieldOptions_CType_IsValidValue(int32_t value);
-
-#pragma mark - Enum GPBFieldOptions_JSType
-
-typedef GPB_ENUM(GPBFieldOptions_JSType) {
-  /// Use the default type.
-  GPBFieldOptions_JSType_JsNormal = 0,
-
-  /// Use JavaScript strings.
-  GPBFieldOptions_JSType_JsString = 1,
-
-  /// Use JavaScript numbers.
-  GPBFieldOptions_JSType_JsNumber = 2,
-};
-
-GPBEnumDescriptor *GPBFieldOptions_JSType_EnumDescriptor(void);
-
-/// Checks to see if the given value is defined by the enum or was not known at
-/// the time this source was generated.
-BOOL GPBFieldOptions_JSType_IsValidValue(int32_t value);
-
-#pragma mark - GPBDescriptorRoot
-
-/// Exposes the extension registry for this file.
-///
-/// The base class provides:
-/// @code
-///   + (GPBExtensionRegistry *)extensionRegistry;
-/// @endcode
-/// which is a @c GPBExtensionRegistry that includes all the extensions defined by
-/// this file and all files that it depends on.
-@interface GPBDescriptorRoot : GPBRootObject
-@end
-
-#pragma mark - GPBFileDescriptorSet
-
-typedef GPB_ENUM(GPBFileDescriptorSet_FieldNumber) {
-  GPBFileDescriptorSet_FieldNumber_FileArray = 1,
-};
-
-/// The protocol compiler can output a FileDescriptorSet containing the .proto
-/// files it parses.
-@interface GPBFileDescriptorSet : GPBMessage
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBFileDescriptorProto*> *fileArray;
-/// The number of items in @c fileArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger fileArray_Count;
-
-@end
-
-#pragma mark - GPBFileDescriptorProto
-
-typedef GPB_ENUM(GPBFileDescriptorProto_FieldNumber) {
-  GPBFileDescriptorProto_FieldNumber_Name = 1,
-  GPBFileDescriptorProto_FieldNumber_Package = 2,
-  GPBFileDescriptorProto_FieldNumber_DependencyArray = 3,
-  GPBFileDescriptorProto_FieldNumber_MessageTypeArray = 4,
-  GPBFileDescriptorProto_FieldNumber_EnumTypeArray = 5,
-  GPBFileDescriptorProto_FieldNumber_ServiceArray = 6,
-  GPBFileDescriptorProto_FieldNumber_ExtensionArray = 7,
-  GPBFileDescriptorProto_FieldNumber_Options = 8,
-  GPBFileDescriptorProto_FieldNumber_SourceCodeInfo = 9,
-  GPBFileDescriptorProto_FieldNumber_PublicDependencyArray = 10,
-  GPBFileDescriptorProto_FieldNumber_WeakDependencyArray = 11,
-  GPBFileDescriptorProto_FieldNumber_Syntax = 12,
-};
-
-/// Describes a complete .proto file.
-@interface GPBFileDescriptorProto : GPBMessage
-
-/// file name, relative to root of source tree
-@property(nonatomic, readwrite, copy, null_resettable) NSString *name;
-/// Test to see if @c name has been set.
-@property(nonatomic, readwrite) BOOL hasName;
-
-/// e.g. "foo", "foo.bar", etc.
-@property(nonatomic, readwrite, copy, null_resettable) NSString *package;
-/// Test to see if @c package has been set.
-@property(nonatomic, readwrite) BOOL hasPackage;
-
-/// Names of files imported by this file.
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<NSString*> *dependencyArray;
-/// The number of items in @c dependencyArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger dependencyArray_Count;
-
-/// Indexes of the public imported files in the dependency list above.
-@property(nonatomic, readwrite, strong, null_resettable) GPBInt32Array *publicDependencyArray;
-/// The number of items in @c publicDependencyArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger publicDependencyArray_Count;
-
-/// Indexes of the weak imported files in the dependency list.
-/// For Google-internal migration only. Do not use.
-@property(nonatomic, readwrite, strong, null_resettable) GPBInt32Array *weakDependencyArray;
-/// The number of items in @c weakDependencyArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger weakDependencyArray_Count;
-
-/// All top-level definitions in this file.
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBDescriptorProto*> *messageTypeArray;
-/// The number of items in @c messageTypeArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger messageTypeArray_Count;
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBEnumDescriptorProto*> *enumTypeArray;
-/// The number of items in @c enumTypeArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger enumTypeArray_Count;
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBServiceDescriptorProto*> *serviceArray;
-/// The number of items in @c serviceArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger serviceArray_Count;
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBFieldDescriptorProto*> *extensionArray;
-/// The number of items in @c extensionArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger extensionArray_Count;
-
-@property(nonatomic, readwrite, strong, null_resettable) GPBFileOptions *options;
-/// Test to see if @c options has been set.
-@property(nonatomic, readwrite) BOOL hasOptions;
-
-/// This field contains optional information about the original source code.
-/// You may safely remove this entire field without harming runtime
-/// functionality of the descriptors -- the information is needed only by
-/// development tools.
-@property(nonatomic, readwrite, strong, null_resettable) GPBSourceCodeInfo *sourceCodeInfo;
-/// Test to see if @c sourceCodeInfo has been set.
-@property(nonatomic, readwrite) BOOL hasSourceCodeInfo;
-
-/// The syntax of the proto file.
-/// The supported values are "proto2" and "proto3".
-@property(nonatomic, readwrite, copy, null_resettable) NSString *syntax;
-/// Test to see if @c syntax has been set.
-@property(nonatomic, readwrite) BOOL hasSyntax;
-
-@end
-
-#pragma mark - GPBDescriptorProto
-
-typedef GPB_ENUM(GPBDescriptorProto_FieldNumber) {
-  GPBDescriptorProto_FieldNumber_Name = 1,
-  GPBDescriptorProto_FieldNumber_FieldArray = 2,
-  GPBDescriptorProto_FieldNumber_NestedTypeArray = 3,
-  GPBDescriptorProto_FieldNumber_EnumTypeArray = 4,
-  GPBDescriptorProto_FieldNumber_ExtensionRangeArray = 5,
-  GPBDescriptorProto_FieldNumber_ExtensionArray = 6,
-  GPBDescriptorProto_FieldNumber_Options = 7,
-  GPBDescriptorProto_FieldNumber_OneofDeclArray = 8,
-  GPBDescriptorProto_FieldNumber_ReservedRangeArray = 9,
-  GPBDescriptorProto_FieldNumber_ReservedNameArray = 10,
-};
-
-/// Describes a message type.
-@interface GPBDescriptorProto : GPBMessage
-
-@property(nonatomic, readwrite, copy, null_resettable) NSString *name;
-/// Test to see if @c name has been set.
-@property(nonatomic, readwrite) BOOL hasName;
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBFieldDescriptorProto*> *fieldArray;
-/// The number of items in @c fieldArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger fieldArray_Count;
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBFieldDescriptorProto*> *extensionArray;
-/// The number of items in @c extensionArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger extensionArray_Count;
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBDescriptorProto*> *nestedTypeArray;
-/// The number of items in @c nestedTypeArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger nestedTypeArray_Count;
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBEnumDescriptorProto*> *enumTypeArray;
-/// The number of items in @c enumTypeArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger enumTypeArray_Count;
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBDescriptorProto_ExtensionRange*> *extensionRangeArray;
-/// The number of items in @c extensionRangeArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger extensionRangeArray_Count;
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBOneofDescriptorProto*> *oneofDeclArray;
-/// The number of items in @c oneofDeclArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger oneofDeclArray_Count;
-
-@property(nonatomic, readwrite, strong, null_resettable) GPBMessageOptions *options;
-/// Test to see if @c options has been set.
-@property(nonatomic, readwrite) BOOL hasOptions;
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBDescriptorProto_ReservedRange*> *reservedRangeArray;
-/// The number of items in @c reservedRangeArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger reservedRangeArray_Count;
-
-/// Reserved field names, which may not be used by fields in the same message.
-/// A given name may only be reserved once.
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<NSString*> *reservedNameArray;
-/// The number of items in @c reservedNameArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger reservedNameArray_Count;
-
-@end
-
-#pragma mark - GPBDescriptorProto_ExtensionRange
-
-typedef GPB_ENUM(GPBDescriptorProto_ExtensionRange_FieldNumber) {
-  GPBDescriptorProto_ExtensionRange_FieldNumber_Start = 1,
-  GPBDescriptorProto_ExtensionRange_FieldNumber_End = 2,
-};
-
-@interface GPBDescriptorProto_ExtensionRange : GPBMessage
-
-@property(nonatomic, readwrite) int32_t start;
-
-@property(nonatomic, readwrite) BOOL hasStart;
-@property(nonatomic, readwrite) int32_t end;
-
-@property(nonatomic, readwrite) BOOL hasEnd;
-@end
-
-#pragma mark - GPBDescriptorProto_ReservedRange
-
-typedef GPB_ENUM(GPBDescriptorProto_ReservedRange_FieldNumber) {
-  GPBDescriptorProto_ReservedRange_FieldNumber_Start = 1,
-  GPBDescriptorProto_ReservedRange_FieldNumber_End = 2,
-};
-
-/// Range of reserved tag numbers. Reserved tag numbers may not be used by
-/// fields or extension ranges in the same message. Reserved ranges may
-/// not overlap.
-@interface GPBDescriptorProto_ReservedRange : GPBMessage
-
-/// Inclusive.
-@property(nonatomic, readwrite) int32_t start;
-
-@property(nonatomic, readwrite) BOOL hasStart;
-/// Exclusive.
-@property(nonatomic, readwrite) int32_t end;
-
-@property(nonatomic, readwrite) BOOL hasEnd;
-@end
-
-#pragma mark - GPBFieldDescriptorProto
-
-typedef GPB_ENUM(GPBFieldDescriptorProto_FieldNumber) {
-  GPBFieldDescriptorProto_FieldNumber_Name = 1,
-  GPBFieldDescriptorProto_FieldNumber_Extendee = 2,
-  GPBFieldDescriptorProto_FieldNumber_Number = 3,
-  GPBFieldDescriptorProto_FieldNumber_Label = 4,
-  GPBFieldDescriptorProto_FieldNumber_Type = 5,
-  GPBFieldDescriptorProto_FieldNumber_TypeName = 6,
-  GPBFieldDescriptorProto_FieldNumber_DefaultValue = 7,
-  GPBFieldDescriptorProto_FieldNumber_Options = 8,
-  GPBFieldDescriptorProto_FieldNumber_OneofIndex = 9,
-  GPBFieldDescriptorProto_FieldNumber_JsonName = 10,
-};
-
-/// Describes a field within a message.
-@interface GPBFieldDescriptorProto : GPBMessage
-
-@property(nonatomic, readwrite, copy, null_resettable) NSString *name;
-/// Test to see if @c name has been set.
-@property(nonatomic, readwrite) BOOL hasName;
-
-@property(nonatomic, readwrite) int32_t number;
-
-@property(nonatomic, readwrite) BOOL hasNumber;
-@property(nonatomic, readwrite) GPBFieldDescriptorProto_Label label;
-
-@property(nonatomic, readwrite) BOOL hasLabel;
-/// If type_name is set, this need not be set.  If both this and type_name
-/// are set, this must be one of TYPE_ENUM, TYPE_MESSAGE or TYPE_GROUP.
-@property(nonatomic, readwrite) GPBFieldDescriptorProto_Type type;
-
-@property(nonatomic, readwrite) BOOL hasType;
-/// For message and enum types, this is the name of the type.  If the name
-/// starts with a '.', it is fully-qualified.  Otherwise, C++-like scoping
-/// rules are used to find the type (i.e. first the nested types within this
-/// message are searched, then within the parent, on up to the root
-/// namespace).
-@property(nonatomic, readwrite, copy, null_resettable) NSString *typeName;
-/// Test to see if @c typeName has been set.
-@property(nonatomic, readwrite) BOOL hasTypeName;
-
-/// For extensions, this is the name of the type being extended.  It is
-/// resolved in the same manner as type_name.
-@property(nonatomic, readwrite, copy, null_resettable) NSString *extendee;
-/// Test to see if @c extendee has been set.
-@property(nonatomic, readwrite) BOOL hasExtendee;
-
-/// For numeric types, contains the original text representation of the value.
-/// For booleans, "true" or "false".
-/// For strings, contains the default text contents (not escaped in any way).
-/// For bytes, contains the C escaped value.  All bytes >= 128 are escaped.
-/// TODO(kenton):  Base-64 encode?
-@property(nonatomic, readwrite, copy, null_resettable) NSString *defaultValue;
-/// Test to see if @c defaultValue has been set.
-@property(nonatomic, readwrite) BOOL hasDefaultValue;
-
-/// If set, gives the index of a oneof in the containing type's oneof_decl
-/// list.  This field is a member of that oneof.
-@property(nonatomic, readwrite) int32_t oneofIndex;
-
-@property(nonatomic, readwrite) BOOL hasOneofIndex;
-/// JSON name of this field. The value is set by protocol compiler. If the
-/// user has set a "json_name" option on this field, that option's value
-/// will be used. Otherwise, it's deduced from the field's name by converting
-/// it to camelCase.
-@property(nonatomic, readwrite, copy, null_resettable) NSString *jsonName;
-/// Test to see if @c jsonName has been set.
-@property(nonatomic, readwrite) BOOL hasJsonName;
-
-@property(nonatomic, readwrite, strong, null_resettable) GPBFieldOptions *options;
-/// Test to see if @c options has been set.
-@property(nonatomic, readwrite) BOOL hasOptions;
-
-@end
-
-#pragma mark - GPBOneofDescriptorProto
-
-typedef GPB_ENUM(GPBOneofDescriptorProto_FieldNumber) {
-  GPBOneofDescriptorProto_FieldNumber_Name = 1,
-};
-
-/// Describes a oneof.
-@interface GPBOneofDescriptorProto : GPBMessage
-
-@property(nonatomic, readwrite, copy, null_resettable) NSString *name;
-/// Test to see if @c name has been set.
-@property(nonatomic, readwrite) BOOL hasName;
-
-@end
-
-#pragma mark - GPBEnumDescriptorProto
-
-typedef GPB_ENUM(GPBEnumDescriptorProto_FieldNumber) {
-  GPBEnumDescriptorProto_FieldNumber_Name = 1,
-  GPBEnumDescriptorProto_FieldNumber_ValueArray = 2,
-  GPBEnumDescriptorProto_FieldNumber_Options = 3,
-};
-
-/// Describes an enum type.
-@interface GPBEnumDescriptorProto : GPBMessage
-
-@property(nonatomic, readwrite, copy, null_resettable) NSString *name;
-/// Test to see if @c name has been set.
-@property(nonatomic, readwrite) BOOL hasName;
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBEnumValueDescriptorProto*> *valueArray;
-/// The number of items in @c valueArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger valueArray_Count;
-
-@property(nonatomic, readwrite, strong, null_resettable) GPBEnumOptions *options;
-/// Test to see if @c options has been set.
-@property(nonatomic, readwrite) BOOL hasOptions;
-
-@end
-
-#pragma mark - GPBEnumValueDescriptorProto
-
-typedef GPB_ENUM(GPBEnumValueDescriptorProto_FieldNumber) {
-  GPBEnumValueDescriptorProto_FieldNumber_Name = 1,
-  GPBEnumValueDescriptorProto_FieldNumber_Number = 2,
-  GPBEnumValueDescriptorProto_FieldNumber_Options = 3,
-};
-
-/// Describes a value within an enum.
-@interface GPBEnumValueDescriptorProto : GPBMessage
-
-@property(nonatomic, readwrite, copy, null_resettable) NSString *name;
-/// Test to see if @c name has been set.
-@property(nonatomic, readwrite) BOOL hasName;
-
-@property(nonatomic, readwrite) int32_t number;
-
-@property(nonatomic, readwrite) BOOL hasNumber;
-@property(nonatomic, readwrite, strong, null_resettable) GPBEnumValueOptions *options;
-/// Test to see if @c options has been set.
-@property(nonatomic, readwrite) BOOL hasOptions;
-
-@end
-
-#pragma mark - GPBServiceDescriptorProto
-
-typedef GPB_ENUM(GPBServiceDescriptorProto_FieldNumber) {
-  GPBServiceDescriptorProto_FieldNumber_Name = 1,
-  GPBServiceDescriptorProto_FieldNumber_MethodArray = 2,
-  GPBServiceDescriptorProto_FieldNumber_Options = 3,
-};
-
-/// Describes a service.
-@interface GPBServiceDescriptorProto : GPBMessage
-
-@property(nonatomic, readwrite, copy, null_resettable) NSString *name;
-/// Test to see if @c name has been set.
-@property(nonatomic, readwrite) BOOL hasName;
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBMethodDescriptorProto*> *methodArray;
-/// The number of items in @c methodArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger methodArray_Count;
-
-@property(nonatomic, readwrite, strong, null_resettable) GPBServiceOptions *options;
-/// Test to see if @c options has been set.
-@property(nonatomic, readwrite) BOOL hasOptions;
-
-@end
-
-#pragma mark - GPBMethodDescriptorProto
-
-typedef GPB_ENUM(GPBMethodDescriptorProto_FieldNumber) {
-  GPBMethodDescriptorProto_FieldNumber_Name = 1,
-  GPBMethodDescriptorProto_FieldNumber_InputType = 2,
-  GPBMethodDescriptorProto_FieldNumber_OutputType = 3,
-  GPBMethodDescriptorProto_FieldNumber_Options = 4,
-  GPBMethodDescriptorProto_FieldNumber_ClientStreaming = 5,
-  GPBMethodDescriptorProto_FieldNumber_ServerStreaming = 6,
-};
-
-/// Describes a method of a service.
-@interface GPBMethodDescriptorProto : GPBMessage
-
-@property(nonatomic, readwrite, copy, null_resettable) NSString *name;
-/// Test to see if @c name has been set.
-@property(nonatomic, readwrite) BOOL hasName;
-
-/// Input and output type names.  These are resolved in the same way as
-/// FieldDescriptorProto.type_name, but must refer to a message type.
-@property(nonatomic, readwrite, copy, null_resettable) NSString *inputType;
-/// Test to see if @c inputType has been set.
-@property(nonatomic, readwrite) BOOL hasInputType;
-
-@property(nonatomic, readwrite, copy, null_resettable) NSString *outputType;
-/// Test to see if @c outputType has been set.
-@property(nonatomic, readwrite) BOOL hasOutputType;
-
-@property(nonatomic, readwrite, strong, null_resettable) GPBMethodOptions *options;
-/// Test to see if @c options has been set.
-@property(nonatomic, readwrite) BOOL hasOptions;
-
-/// Identifies if client streams multiple client messages
-@property(nonatomic, readwrite) BOOL clientStreaming;
-
-@property(nonatomic, readwrite) BOOL hasClientStreaming;
-/// Identifies if server streams multiple server messages
-@property(nonatomic, readwrite) BOOL serverStreaming;
-
-@property(nonatomic, readwrite) BOOL hasServerStreaming;
-@end
-
-#pragma mark - GPBFileOptions
-
-typedef GPB_ENUM(GPBFileOptions_FieldNumber) {
-  GPBFileOptions_FieldNumber_JavaPackage = 1,
-  GPBFileOptions_FieldNumber_JavaOuterClassname = 8,
-  GPBFileOptions_FieldNumber_OptimizeFor = 9,
-  GPBFileOptions_FieldNumber_JavaMultipleFiles = 10,
-  GPBFileOptions_FieldNumber_GoPackage = 11,
-  GPBFileOptions_FieldNumber_CcGenericServices = 16,
-  GPBFileOptions_FieldNumber_JavaGenericServices = 17,
-  GPBFileOptions_FieldNumber_PyGenericServices = 18,
-  GPBFileOptions_FieldNumber_JavaGenerateEqualsAndHash = 20,
-  GPBFileOptions_FieldNumber_Deprecated = 23,
-  GPBFileOptions_FieldNumber_JavaStringCheckUtf8 = 27,
-  GPBFileOptions_FieldNumber_CcEnableArenas = 31,
-  GPBFileOptions_FieldNumber_ObjcClassPrefix = 36,
-  GPBFileOptions_FieldNumber_CsharpNamespace = 37,
-  GPBFileOptions_FieldNumber_JavananoUseDeprecatedPackage = 38,
-  GPBFileOptions_FieldNumber_UninterpretedOptionArray = 999,
-};
-
-@interface GPBFileOptions : GPBMessage
-
-/// Sets the Java package where classes generated from this .proto will be
-/// placed.  By default, the proto package is used, but this is often
-/// inappropriate because proto packages do not normally start with backwards
-/// domain names.
-@property(nonatomic, readwrite, copy, null_resettable) NSString *javaPackage;
-/// Test to see if @c javaPackage has been set.
-@property(nonatomic, readwrite) BOOL hasJavaPackage;
-
-/// If set, all the classes from the .proto file are wrapped in a single
-/// outer class with the given name.  This applies to both Proto1
-/// (equivalent to the old "--one_java_file" option) and Proto2 (where
-/// a .proto always translates to a single class, but you may want to
-/// explicitly choose the class name).
-@property(nonatomic, readwrite, copy, null_resettable) NSString *javaOuterClassname;
-/// Test to see if @c javaOuterClassname has been set.
-@property(nonatomic, readwrite) BOOL hasJavaOuterClassname;
-
-/// If set true, then the Java code generator will generate a separate .java
-/// file for each top-level message, enum, and service defined in the .proto
-/// file.  Thus, these types will *not* be nested inside the outer class
-/// named by java_outer_classname.  However, the outer class will still be
-/// generated to contain the file's getDescriptor() method as well as any
-/// top-level extensions defined in the file.
-@property(nonatomic, readwrite) BOOL javaMultipleFiles;
-
-@property(nonatomic, readwrite) BOOL hasJavaMultipleFiles;
-/// If set true, then the Java code generator will generate equals() and
-/// hashCode() methods for all messages defined in the .proto file.
-/// This increases generated code size, potentially substantially for large
-/// protos, which may harm a memory-constrained application.
-/// - In the full runtime this is a speed optimization, as the
-/// AbstractMessage base class includes reflection-based implementations of
-/// these methods.
-/// - In the lite runtime, setting this option changes the semantics of
-/// equals() and hashCode() to more closely match those of the full runtime;
-/// the generated methods compute their results based on field values rather
-/// than object identity. (Implementations should not assume that hashcodes
-/// will be consistent across runtimes or versions of the protocol compiler.)
-@property(nonatomic, readwrite) BOOL javaGenerateEqualsAndHash;
-
-@property(nonatomic, readwrite) BOOL hasJavaGenerateEqualsAndHash;
-/// If set true, then the Java2 code generator will generate code that
-/// throws an exception whenever an attempt is made to assign a non-UTF-8
-/// byte sequence to a string field.
-/// Message reflection will do the same.
-/// However, an extension field still accepts non-UTF-8 byte sequences.
-/// This option has no effect on when used with the lite runtime.
-@property(nonatomic, readwrite) BOOL javaStringCheckUtf8;
-
-@property(nonatomic, readwrite) BOOL hasJavaStringCheckUtf8;
-@property(nonatomic, readwrite) GPBFileOptions_OptimizeMode optimizeFor;
-
-@property(nonatomic, readwrite) BOOL hasOptimizeFor;
-/// Sets the Go package where structs generated from this .proto will be
-/// placed. If omitted, the Go package will be derived from the following:
-///   - The basename of the package import path, if provided.
-///   - Otherwise, the package statement in the .proto file, if present.
-///   - Otherwise, the basename of the .proto file, without extension.
-@property(nonatomic, readwrite, copy, null_resettable) NSString *goPackage;
-/// Test to see if @c goPackage has been set.
-@property(nonatomic, readwrite) BOOL hasGoPackage;
-
-/// Should generic services be generated in each language?  "Generic" services
-/// are not specific to any particular RPC system.  They are generated by the
-/// main code generators in each language (without additional plugins).
-/// Generic services were the only kind of service generation supported by
-/// early versions of google.protobuf.
-///
-/// Generic services are now considered deprecated in favor of using plugins
-/// that generate code specific to your particular RPC system.  Therefore,
-/// these default to false.  Old code which depends on generic services should
-/// explicitly set them to true.
-@property(nonatomic, readwrite) BOOL ccGenericServices;
-
-@property(nonatomic, readwrite) BOOL hasCcGenericServices;
-@property(nonatomic, readwrite) BOOL javaGenericServices;
-
-@property(nonatomic, readwrite) BOOL hasJavaGenericServices;
-@property(nonatomic, readwrite) BOOL pyGenericServices;
-
-@property(nonatomic, readwrite) BOOL hasPyGenericServices;
-/// Is this file deprecated?
-/// Depending on the target platform, this can emit Deprecated annotations
-/// for everything in the file, or it will be completely ignored; in the very
-/// least, this is a formalization for deprecating files.
-@property(nonatomic, readwrite) BOOL deprecated;
-
-@property(nonatomic, readwrite) BOOL hasDeprecated;
-/// Enables the use of arenas for the proto messages in this file. This applies
-/// only to generated classes for C++.
-@property(nonatomic, readwrite) BOOL ccEnableArenas;
-
-@property(nonatomic, readwrite) BOOL hasCcEnableArenas;
-/// Sets the objective c class prefix which is prepended to all objective c
-/// generated classes from this .proto. There is no default.
-@property(nonatomic, readwrite, copy, null_resettable) NSString *objcClassPrefix;
-/// Test to see if @c objcClassPrefix has been set.
-@property(nonatomic, readwrite) BOOL hasObjcClassPrefix;
-
-/// Namespace for generated classes; defaults to the package.
-@property(nonatomic, readwrite, copy, null_resettable) NSString *csharpNamespace;
-/// Test to see if @c csharpNamespace has been set.
-@property(nonatomic, readwrite) BOOL hasCsharpNamespace;
-
-/// Whether the nano proto compiler should generate in the deprecated non-nano
-/// suffixed package.
-@property(nonatomic, readwrite) BOOL javananoUseDeprecatedPackage;
-
-@property(nonatomic, readwrite) BOOL hasJavananoUseDeprecatedPackage;
-/// The parser stores options it doesn't recognize here. See above.
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBUninterpretedOption*> *uninterpretedOptionArray;
-/// The number of items in @c uninterpretedOptionArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger uninterpretedOptionArray_Count;
-
-@end
-
-#pragma mark - GPBMessageOptions
-
-typedef GPB_ENUM(GPBMessageOptions_FieldNumber) {
-  GPBMessageOptions_FieldNumber_MessageSetWireFormat = 1,
-  GPBMessageOptions_FieldNumber_NoStandardDescriptorAccessor = 2,
-  GPBMessageOptions_FieldNumber_Deprecated = 3,
-  GPBMessageOptions_FieldNumber_MapEntry = 7,
-  GPBMessageOptions_FieldNumber_UninterpretedOptionArray = 999,
-};
-
-@interface GPBMessageOptions : GPBMessage
-
-/// Set true to use the old proto1 MessageSet wire format for extensions.
-/// This is provided for backwards-compatibility with the MessageSet wire
-/// format.  You should not use this for any other reason:  It's less
-/// efficient, has fewer features, and is more complicated.
-///
-/// The message must be defined exactly as follows:
-///   message Foo {
-///     option message_set_wire_format = true;
-///     extensions 4 to max;
-///   }
-/// Note that the message cannot have any defined fields; MessageSets only
-/// have extensions.
-///
-/// All extensions of your type must be singular messages; e.g. they cannot
-/// be int32s, enums, or repeated messages.
-///
-/// Because this is an option, the above two restrictions are not enforced by
-/// the protocol compiler.
-@property(nonatomic, readwrite) BOOL messageSetWireFormat;
-
-@property(nonatomic, readwrite) BOOL hasMessageSetWireFormat;
-/// Disables the generation of the standard "descriptor()" accessor, which can
-/// conflict with a field of the same name.  This is meant to make migration
-/// from proto1 easier; new code should avoid fields named "descriptor".
-@property(nonatomic, readwrite) BOOL noStandardDescriptorAccessor;
-
-@property(nonatomic, readwrite) BOOL hasNoStandardDescriptorAccessor;
-/// Is this message deprecated?
-/// Depending on the target platform, this can emit Deprecated annotations
-/// for the message, or it will be completely ignored; in the very least,
-/// this is a formalization for deprecating messages.
-@property(nonatomic, readwrite) BOOL deprecated;
-
-@property(nonatomic, readwrite) BOOL hasDeprecated;
-/// Whether the message is an automatically generated map entry type for the
-/// maps field.
-///
-/// For maps fields:
-///     map<KeyType, ValueType> map_field = 1;
-/// The parsed descriptor looks like:
-///     message MapFieldEntry {
-///         option map_entry = true;
-///         optional KeyType key = 1;
-///         optional ValueType value = 2;
-///     }
-///     repeated MapFieldEntry map_field = 1;
-///
-/// Implementations may choose not to generate the map_entry=true message, but
-/// use a native map in the target language to hold the keys and values.
-/// The reflection APIs in such implementions still need to work as
-/// if the field is a repeated message field.
-///
-/// NOTE: Do not set the option in .proto files. Always use the maps syntax
-/// instead. The option should only be implicitly set by the proto compiler
-/// parser.
-@property(nonatomic, readwrite) BOOL mapEntry;
-
-@property(nonatomic, readwrite) BOOL hasMapEntry;
-/// The parser stores options it doesn't recognize here. See above.
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBUninterpretedOption*> *uninterpretedOptionArray;
-/// The number of items in @c uninterpretedOptionArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger uninterpretedOptionArray_Count;
-
-@end
-
-#pragma mark - GPBFieldOptions
-
-typedef GPB_ENUM(GPBFieldOptions_FieldNumber) {
-  GPBFieldOptions_FieldNumber_Ctype = 1,
-  GPBFieldOptions_FieldNumber_Packed = 2,
-  GPBFieldOptions_FieldNumber_Deprecated = 3,
-  GPBFieldOptions_FieldNumber_Lazy = 5,
-  GPBFieldOptions_FieldNumber_Jstype = 6,
-  GPBFieldOptions_FieldNumber_Weak = 10,
-  GPBFieldOptions_FieldNumber_UninterpretedOptionArray = 999,
-};
-
-@interface GPBFieldOptions : GPBMessage
-
-/// The ctype option instructs the C++ code generator to use a different
-/// representation of the field than it normally would.  See the specific
-/// options below.  This option is not yet implemented in the open source
-/// release -- sorry, we'll try to include it in a future version!
-@property(nonatomic, readwrite) GPBFieldOptions_CType ctype;
-
-@property(nonatomic, readwrite) BOOL hasCtype;
-/// The packed option can be enabled for repeated primitive fields to enable
-/// a more efficient representation on the wire. Rather than repeatedly
-/// writing the tag and type for each element, the entire array is encoded as
-/// a single length-delimited blob. In proto3, only explicit setting it to
-/// false will avoid using packed encoding.
-@property(nonatomic, readwrite) BOOL packed;
-
-@property(nonatomic, readwrite) BOOL hasPacked;
-/// The jstype option determines the JavaScript type used for values of the
-/// field.  The option is permitted only for 64 bit integral and fixed types
-/// (int64, uint64, sint64, fixed64, sfixed64).  By default these types are
-/// represented as JavaScript strings.  This avoids loss of precision that can
-/// happen when a large value is converted to a floating point JavaScript
-/// numbers.  Specifying JS_NUMBER for the jstype causes the generated
-/// JavaScript code to use the JavaScript "number" type instead of strings.
-/// This option is an enum to permit additional types to be added,
-/// e.g. goog.math.Integer.
-@property(nonatomic, readwrite) GPBFieldOptions_JSType jstype;
-
-@property(nonatomic, readwrite) BOOL hasJstype;
-/// Should this field be parsed lazily?  Lazy applies only to message-type
-/// fields.  It means that when the outer message is initially parsed, the
-/// inner message's contents will not be parsed but instead stored in encoded
-/// form.  The inner message will actually be parsed when it is first accessed.
-///
-/// This is only a hint.  Implementations are free to choose whether to use
-/// eager or lazy parsing regardless of the value of this option.  However,
-/// setting this option true suggests that the protocol author believes that
-/// using lazy parsing on this field is worth the additional bookkeeping
-/// overhead typically needed to implement it.
-///
-/// This option does not affect the public interface of any generated code;
-/// all method signatures remain the same.  Furthermore, thread-safety of the
-/// interface is not affected by this option; const methods remain safe to
-/// call from multiple threads concurrently, while non-const methods continue
-/// to require exclusive access.
-///
-///
-/// Note that implementations may choose not to check required fields within
-/// a lazy sub-message.  That is, calling IsInitialized() on the outher message
-/// may return true even if the inner message has missing required fields.
-/// This is necessary because otherwise the inner message would have to be
-/// parsed in order to perform the check, defeating the purpose of lazy
-/// parsing.  An implementation which chooses not to check required fields
-/// must be consistent about it.  That is, for any particular sub-message, the
-/// implementation must either *always* check its required fields, or *never*
-/// check its required fields, regardless of whether or not the message has
-/// been parsed.
-@property(nonatomic, readwrite) BOOL lazy;
-
-@property(nonatomic, readwrite) BOOL hasLazy;
-/// Is this field deprecated?
-/// Depending on the target platform, this can emit Deprecated annotations
-/// for accessors, or it will be completely ignored; in the very least, this
-/// is a formalization for deprecating fields.
-@property(nonatomic, readwrite) BOOL deprecated;
-
-@property(nonatomic, readwrite) BOOL hasDeprecated;
-/// For Google-internal migration only. Do not use.
-@property(nonatomic, readwrite) BOOL weak;
-
-@property(nonatomic, readwrite) BOOL hasWeak;
-/// The parser stores options it doesn't recognize here. See above.
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBUninterpretedOption*> *uninterpretedOptionArray;
-/// The number of items in @c uninterpretedOptionArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger uninterpretedOptionArray_Count;
-
-@end
-
-#pragma mark - GPBEnumOptions
-
-typedef GPB_ENUM(GPBEnumOptions_FieldNumber) {
-  GPBEnumOptions_FieldNumber_AllowAlias = 2,
-  GPBEnumOptions_FieldNumber_Deprecated = 3,
-  GPBEnumOptions_FieldNumber_UninterpretedOptionArray = 999,
-};
-
-@interface GPBEnumOptions : GPBMessage
-
-/// Set this option to true to allow mapping different tag names to the same
-/// value.
-@property(nonatomic, readwrite) BOOL allowAlias;
-
-@property(nonatomic, readwrite) BOOL hasAllowAlias;
-/// Is this enum deprecated?
-/// Depending on the target platform, this can emit Deprecated annotations
-/// for the enum, or it will be completely ignored; in the very least, this
-/// is a formalization for deprecating enums.
-@property(nonatomic, readwrite) BOOL deprecated;
-
-@property(nonatomic, readwrite) BOOL hasDeprecated;
-/// The parser stores options it doesn't recognize here. See above.
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBUninterpretedOption*> *uninterpretedOptionArray;
-/// The number of items in @c uninterpretedOptionArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger uninterpretedOptionArray_Count;
-
-@end
-
-#pragma mark - GPBEnumValueOptions
-
-typedef GPB_ENUM(GPBEnumValueOptions_FieldNumber) {
-  GPBEnumValueOptions_FieldNumber_Deprecated = 1,
-  GPBEnumValueOptions_FieldNumber_UninterpretedOptionArray = 999,
-};
-
-@interface GPBEnumValueOptions : GPBMessage
-
-/// Is this enum value deprecated?
-/// Depending on the target platform, this can emit Deprecated annotations
-/// for the enum value, or it will be completely ignored; in the very least,
-/// this is a formalization for deprecating enum values.
-@property(nonatomic, readwrite) BOOL deprecated;
-
-@property(nonatomic, readwrite) BOOL hasDeprecated;
-/// The parser stores options it doesn't recognize here. See above.
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBUninterpretedOption*> *uninterpretedOptionArray;
-/// The number of items in @c uninterpretedOptionArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger uninterpretedOptionArray_Count;
-
-@end
-
-#pragma mark - GPBServiceOptions
-
-typedef GPB_ENUM(GPBServiceOptions_FieldNumber) {
-  GPBServiceOptions_FieldNumber_Deprecated = 33,
-  GPBServiceOptions_FieldNumber_UninterpretedOptionArray = 999,
-};
-
-@interface GPBServiceOptions : GPBMessage
-
-/// Is this service deprecated?
-/// Depending on the target platform, this can emit Deprecated annotations
-/// for the service, or it will be completely ignored; in the very least,
-/// this is a formalization for deprecating services.
-@property(nonatomic, readwrite) BOOL deprecated;
-
-@property(nonatomic, readwrite) BOOL hasDeprecated;
-/// The parser stores options it doesn't recognize here. See above.
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBUninterpretedOption*> *uninterpretedOptionArray;
-/// The number of items in @c uninterpretedOptionArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger uninterpretedOptionArray_Count;
-
-@end
-
-#pragma mark - GPBMethodOptions
-
-typedef GPB_ENUM(GPBMethodOptions_FieldNumber) {
-  GPBMethodOptions_FieldNumber_Deprecated = 33,
-  GPBMethodOptions_FieldNumber_UninterpretedOptionArray = 999,
-};
-
-@interface GPBMethodOptions : GPBMessage
-
-/// Is this method deprecated?
-/// Depending on the target platform, this can emit Deprecated annotations
-/// for the method, or it will be completely ignored; in the very least,
-/// this is a formalization for deprecating methods.
-@property(nonatomic, readwrite) BOOL deprecated;
-
-@property(nonatomic, readwrite) BOOL hasDeprecated;
-/// The parser stores options it doesn't recognize here. See above.
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBUninterpretedOption*> *uninterpretedOptionArray;
-/// The number of items in @c uninterpretedOptionArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger uninterpretedOptionArray_Count;
-
-@end
-
-#pragma mark - GPBUninterpretedOption
-
-typedef GPB_ENUM(GPBUninterpretedOption_FieldNumber) {
-  GPBUninterpretedOption_FieldNumber_NameArray = 2,
-  GPBUninterpretedOption_FieldNumber_IdentifierValue = 3,
-  GPBUninterpretedOption_FieldNumber_PositiveIntValue = 4,
-  GPBUninterpretedOption_FieldNumber_NegativeIntValue = 5,
-  GPBUninterpretedOption_FieldNumber_DoubleValue = 6,
-  GPBUninterpretedOption_FieldNumber_StringValue = 7,
-  GPBUninterpretedOption_FieldNumber_AggregateValue = 8,
-};
-
-/// A message representing a option the parser does not recognize. This only
-/// appears in options protos created by the compiler::Parser class.
-/// DescriptorPool resolves these when building Descriptor objects. Therefore,
-/// options protos in descriptor objects (e.g. returned by Descriptor::options(),
-/// or produced by Descriptor::CopyTo()) will never have UninterpretedOptions
-/// in them.
-@interface GPBUninterpretedOption : GPBMessage
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBUninterpretedOption_NamePart*> *nameArray;
-/// The number of items in @c nameArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger nameArray_Count;
-
-/// The value of the uninterpreted option, in whatever type the tokenizer
-/// identified it as during parsing. Exactly one of these should be set.
-@property(nonatomic, readwrite, copy, null_resettable) NSString *identifierValue;
-/// Test to see if @c identifierValue has been set.
-@property(nonatomic, readwrite) BOOL hasIdentifierValue;
-
-@property(nonatomic, readwrite) uint64_t positiveIntValue;
-
-@property(nonatomic, readwrite) BOOL hasPositiveIntValue;
-@property(nonatomic, readwrite) int64_t negativeIntValue;
-
-@property(nonatomic, readwrite) BOOL hasNegativeIntValue;
-@property(nonatomic, readwrite) double doubleValue;
-
-@property(nonatomic, readwrite) BOOL hasDoubleValue;
-@property(nonatomic, readwrite, copy, null_resettable) NSData *stringValue;
-/// Test to see if @c stringValue has been set.
-@property(nonatomic, readwrite) BOOL hasStringValue;
-
-@property(nonatomic, readwrite, copy, null_resettable) NSString *aggregateValue;
-/// Test to see if @c aggregateValue has been set.
-@property(nonatomic, readwrite) BOOL hasAggregateValue;
-
-@end
-
-#pragma mark - GPBUninterpretedOption_NamePart
-
-typedef GPB_ENUM(GPBUninterpretedOption_NamePart_FieldNumber) {
-  GPBUninterpretedOption_NamePart_FieldNumber_NamePart = 1,
-  GPBUninterpretedOption_NamePart_FieldNumber_IsExtension = 2,
-};
-
-/// The name of the uninterpreted option.  Each string represents a segment in
-/// a dot-separated name.  is_extension is true iff a segment represents an
-/// extension (denoted with parentheses in options specs in .proto files).
-/// E.g.,{ ["foo", false], ["bar.baz", true], ["qux", false] } represents
-/// "foo.(bar.baz).qux".
-@interface GPBUninterpretedOption_NamePart : GPBMessage
-
-@property(nonatomic, readwrite, copy, null_resettable) NSString *namePart;
-/// Test to see if @c namePart has been set.
-@property(nonatomic, readwrite) BOOL hasNamePart;
-
-@property(nonatomic, readwrite) BOOL isExtension;
-
-@property(nonatomic, readwrite) BOOL hasIsExtension;
-@end
-
-#pragma mark - GPBSourceCodeInfo
-
-typedef GPB_ENUM(GPBSourceCodeInfo_FieldNumber) {
-  GPBSourceCodeInfo_FieldNumber_LocationArray = 1,
-};
-
-/// Encapsulates information about the original source file from which a
-/// FileDescriptorProto was generated.
-@interface GPBSourceCodeInfo : GPBMessage
-
-/// A Location identifies a piece of source code in a .proto file which
-/// corresponds to a particular definition.  This information is intended
-/// to be useful to IDEs, code indexers, documentation generators, and similar
-/// tools.
-///
-/// For example, say we have a file like:
-///   message Foo {
-///     optional string foo = 1;
-///   }
-/// Let's look at just the field definition:
-///   optional string foo = 1;
-///   ^       ^^     ^^  ^  ^^^
-///   a       bc     de  f  ghi
-/// We have the following locations:
-///   span   path               represents
-///   [a,i)  [ 4, 0, 2, 0 ]     The whole field definition.
-///   [a,b)  [ 4, 0, 2, 0, 4 ]  The label (optional).
-///   [c,d)  [ 4, 0, 2, 0, 5 ]  The type (string).
-///   [e,f)  [ 4, 0, 2, 0, 1 ]  The name (foo).
-///   [g,h)  [ 4, 0, 2, 0, 3 ]  The number (1).
-///
-/// Notes:
-/// - A location may refer to a repeated field itself (i.e. not to any
-///   particular index within it).  This is used whenever a set of elements are
-///   logically enclosed in a single code segment.  For example, an entire
-///   extend block (possibly containing multiple extension definitions) will
-///   have an outer location whose path refers to the "extensions" repeated
-///   field without an index.
-/// - Multiple locations may have the same path.  This happens when a single
-///   logical declaration is spread out across multiple places.  The most
-///   obvious example is the "extend" block again -- there may be multiple
-///   extend blocks in the same scope, each of which will have the same path.
-/// - A location's span is not always a subset of its parent's span.  For
-///   example, the "extendee" of an extension declaration appears at the
-///   beginning of the "extend" block and is shared by all extensions within
-///   the block.
-/// - Just because a location's span is a subset of some other location's span
-///   does not mean that it is a descendent.  For example, a "group" defines
-///   both a type and a field in a single declaration.  Thus, the locations
-///   corresponding to the type and field and their components will overlap.
-/// - Code which tries to interpret locations should probably be designed to
-///   ignore those that it doesn't understand, as more types of locations could
-///   be recorded in the future.
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBSourceCodeInfo_Location*> *locationArray;
-/// The number of items in @c locationArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger locationArray_Count;
-
-@end
-
-#pragma mark - GPBSourceCodeInfo_Location
-
-typedef GPB_ENUM(GPBSourceCodeInfo_Location_FieldNumber) {
-  GPBSourceCodeInfo_Location_FieldNumber_PathArray = 1,
-  GPBSourceCodeInfo_Location_FieldNumber_SpanArray = 2,
-  GPBSourceCodeInfo_Location_FieldNumber_LeadingComments = 3,
-  GPBSourceCodeInfo_Location_FieldNumber_TrailingComments = 4,
-  GPBSourceCodeInfo_Location_FieldNumber_LeadingDetachedCommentsArray = 6,
-};
-
-@interface GPBSourceCodeInfo_Location : GPBMessage
-
-/// Identifies which part of the FileDescriptorProto was defined at this
-/// location.
-///
-/// Each element is a field number or an index.  They form a path from
-/// the root FileDescriptorProto to the place where the definition.  For
-/// example, this path:
-///   [ 4, 3, 2, 7, 1 ]
-/// refers to:
-///   file.message_type(3)  // 4, 3
-///       .field(7)         // 2, 7
-///       .name()           // 1
-/// This is because FileDescriptorProto.message_type has field number 4:
-///   repeated DescriptorProto message_type = 4;
-/// and DescriptorProto.field has field number 2:
-///   repeated FieldDescriptorProto field = 2;
-/// and FieldDescriptorProto.name has field number 1:
-///   optional string name = 1;
-///
-/// Thus, the above path gives the location of a field name.  If we removed
-/// the last element:
-///   [ 4, 3, 2, 7 ]
-/// this path refers to the whole field declaration (from the beginning
-/// of the label to the terminating semicolon).
-@property(nonatomic, readwrite, strong, null_resettable) GPBInt32Array *pathArray;
-/// The number of items in @c pathArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger pathArray_Count;
-
-/// Always has exactly three or four elements: start line, start column,
-/// end line (optional, otherwise assumed same as start line), end column.
-/// These are packed into a single field for efficiency.  Note that line
-/// and column numbers are zero-based -- typically you will want to add
-/// 1 to each before displaying to a user.
-@property(nonatomic, readwrite, strong, null_resettable) GPBInt32Array *spanArray;
-/// The number of items in @c spanArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger spanArray_Count;
-
-/// If this SourceCodeInfo represents a complete declaration, these are any
-/// comments appearing before and after the declaration which appear to be
-/// attached to the declaration.
-///
-/// A series of line comments appearing on consecutive lines, with no other
-/// tokens appearing on those lines, will be treated as a single comment.
-///
-/// leading_detached_comments will keep paragraphs of comments that appear
-/// before (but not connected to) the current element. Each paragraph,
-/// separated by empty lines, will be one comment element in the repeated
-/// field.
-///
-/// Only the comment content is provided; comment markers (e.g. //) are
-/// stripped out.  For block comments, leading whitespace and an asterisk
-/// will be stripped from the beginning of each line other than the first.
-/// Newlines are included in the output.
-///
-/// Examples:
-///
-///   optional int32 foo = 1;  // Comment attached to foo.
-///   // Comment attached to bar.
-///   optional int32 bar = 2;
-///
-///   optional string baz = 3;
-///   // Comment attached to baz.
-///   // Another line attached to baz.
-///
-///   // Comment attached to qux.
-///   //
-///   // Another line attached to qux.
-///   optional double qux = 4;
-///
-///   // Detached comment for corge. This is not leading or trailing comments
-///   // to qux or corge because there are blank lines separating it from
-///   // both.
-///
-///   // Detached comment for corge paragraph 2.
-///
-///   optional string corge = 5;
-///   /* Block comment attached
-///    * to corge.  Leading asterisks
-///    * will be removed. */
-///   /* Block comment attached to
-///    * grault. */
-///   optional int32 grault = 6;
-///
-///   // ignored detached comments.
-@property(nonatomic, readwrite, copy, null_resettable) NSString *leadingComments;
-/// Test to see if @c leadingComments has been set.
-@property(nonatomic, readwrite) BOOL hasLeadingComments;
-
-@property(nonatomic, readwrite, copy, null_resettable) NSString *trailingComments;
-/// Test to see if @c trailingComments has been set.
-@property(nonatomic, readwrite) BOOL hasTrailingComments;
-
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<NSString*> *leadingDetachedCommentsArray;
-/// The number of items in @c leadingDetachedCommentsArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger leadingDetachedCommentsArray_Count;
-
-@end
-
-#pragma mark - GPBGeneratedCodeInfo
-
-typedef GPB_ENUM(GPBGeneratedCodeInfo_FieldNumber) {
-  GPBGeneratedCodeInfo_FieldNumber_AnnotationArray = 1,
-};
-
-/// Describes the relationship between generated code and its original source
-/// file. A GeneratedCodeInfo message is associated with only one generated
-/// source file, but may contain references to different source .proto files.
-@interface GPBGeneratedCodeInfo : GPBMessage
-
-/// An Annotation connects some span of text in generated code to an element
-/// of its generating .proto file.
-@property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBGeneratedCodeInfo_Annotation*> *annotationArray;
-/// The number of items in @c annotationArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger annotationArray_Count;
-
-@end
-
-#pragma mark - GPBGeneratedCodeInfo_Annotation
-
-typedef GPB_ENUM(GPBGeneratedCodeInfo_Annotation_FieldNumber) {
-  GPBGeneratedCodeInfo_Annotation_FieldNumber_PathArray = 1,
-  GPBGeneratedCodeInfo_Annotation_FieldNumber_SourceFile = 2,
-  GPBGeneratedCodeInfo_Annotation_FieldNumber_Begin = 3,
-  GPBGeneratedCodeInfo_Annotation_FieldNumber_End = 4,
-};
-
-@interface GPBGeneratedCodeInfo_Annotation : GPBMessage
-
-/// Identifies the element in the original source .proto file. This field
-/// is formatted the same as SourceCodeInfo.Location.path.
-@property(nonatomic, readwrite, strong, null_resettable) GPBInt32Array *pathArray;
-/// The number of items in @c pathArray without causing the array to be created.
-@property(nonatomic, readonly) NSUInteger pathArray_Count;
-
-/// Identifies the filesystem path to the original source .proto.
-@property(nonatomic, readwrite, copy, null_resettable) NSString *sourceFile;
-/// Test to see if @c sourceFile has been set.
-@property(nonatomic, readwrite) BOOL hasSourceFile;
-
-/// Identifies the starting offset in bytes in the generated code
-/// that relates to the identified object.
-@property(nonatomic, readwrite) int32_t begin;
-
-@property(nonatomic, readwrite) BOOL hasBegin;
-/// Identifies the ending offset in bytes in the generated code that
-/// relates to the identified offset. The end offset should be one past
-/// the last relevant byte (so the length of the text = end - begin).
-@property(nonatomic, readwrite) int32_t end;
-
-@property(nonatomic, readwrite) BOOL hasEnd;
-@end
-
-NS_ASSUME_NONNULL_END
-
-CF_EXTERN_C_END
-
-// @@protoc_insertion_point(global_scope)
diff --git a/objectivec/google/protobuf/Descriptor.pbobjc.m b/objectivec/google/protobuf/Descriptor.pbobjc.m
deleted file mode 100644
index 4030989..0000000
--- a/objectivec/google/protobuf/Descriptor.pbobjc.m
+++ /dev/null
@@ -1,2594 +0,0 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/descriptor.proto
-
-#import "GPBProtocolBuffers_RuntimeSupport.h"
-#import "google/protobuf/Descriptor.pbobjc.h"
-// @@protoc_insertion_point(imports)
-
-#pragma mark - GPBDescriptorRoot
-
-@implementation GPBDescriptorRoot
-
-@end
-
-#pragma mark - GPBDescriptorRoot_FileDescriptor
-
-static GPBFileDescriptor *GPBDescriptorRoot_FileDescriptor(void) {
-  // This is called by +initialize so there is no need to worry
-  // about thread safety of the singleton.
-  static GPBFileDescriptor *descriptor = NULL;
-  if (!descriptor) {
-    GPBDebugCheckRuntimeVersion();
-    descriptor = [[GPBFileDescriptor alloc] initWithPackage:@"google.protobuf"
-                                                     syntax:GPBFileSyntaxProto2];
-  }
-  return descriptor;
-}
-
-#pragma mark - GPBFileDescriptorSet
-
-@implementation GPBFileDescriptorSet
-
-@dynamic fileArray, fileArray_Count;
-
-typedef struct GPBFileDescriptorSet__storage_ {
-  uint32_t _has_storage_[1];
-  NSMutableArray *fileArray;
-} GPBFileDescriptorSet__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "fileArray",
-        .number = GPBFileDescriptorSet_FieldNumber_FileArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBFileDescriptorSet__storage_, fileArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBFileDescriptorProto),
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBFileDescriptorSet class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBFileDescriptorSet__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBFileDescriptorProto
-
-@implementation GPBFileDescriptorProto
-
-@dynamic hasName, name;
-@dynamic hasPackage, package;
-@dynamic dependencyArray, dependencyArray_Count;
-@dynamic publicDependencyArray, publicDependencyArray_Count;
-@dynamic weakDependencyArray, weakDependencyArray_Count;
-@dynamic messageTypeArray, messageTypeArray_Count;
-@dynamic enumTypeArray, enumTypeArray_Count;
-@dynamic serviceArray, serviceArray_Count;
-@dynamic extensionArray, extensionArray_Count;
-@dynamic hasOptions, options;
-@dynamic hasSourceCodeInfo, sourceCodeInfo;
-@dynamic hasSyntax, syntax;
-
-typedef struct GPBFileDescriptorProto__storage_ {
-  uint32_t _has_storage_[1];
-  NSString *name;
-  NSString *package;
-  NSMutableArray *dependencyArray;
-  NSMutableArray *messageTypeArray;
-  NSMutableArray *enumTypeArray;
-  NSMutableArray *serviceArray;
-  NSMutableArray *extensionArray;
-  GPBFileOptions *options;
-  GPBSourceCodeInfo *sourceCodeInfo;
-  GPBInt32Array *publicDependencyArray;
-  GPBInt32Array *weakDependencyArray;
-  NSString *syntax;
-} GPBFileDescriptorProto__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "name",
-        .number = GPBFileDescriptorProto_FieldNumber_Name,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFileDescriptorProto__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "package",
-        .number = GPBFileDescriptorProto_FieldNumber_Package,
-        .hasIndex = 1,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFileDescriptorProto__storage_, package),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "dependencyArray",
-        .number = GPBFileDescriptorProto_FieldNumber_DependencyArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFileDescriptorProto__storage_, dependencyArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "messageTypeArray",
-        .number = GPBFileDescriptorProto_FieldNumber_MessageTypeArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBFileDescriptorProto__storage_, messageTypeArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBDescriptorProto),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "enumTypeArray",
-        .number = GPBFileDescriptorProto_FieldNumber_EnumTypeArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBFileDescriptorProto__storage_, enumTypeArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBEnumDescriptorProto),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "serviceArray",
-        .number = GPBFileDescriptorProto_FieldNumber_ServiceArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBFileDescriptorProto__storage_, serviceArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBServiceDescriptorProto),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "extensionArray",
-        .number = GPBFileDescriptorProto_FieldNumber_ExtensionArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBFileDescriptorProto__storage_, extensionArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBFieldDescriptorProto),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "options",
-        .number = GPBFileDescriptorProto_FieldNumber_Options,
-        .hasIndex = 9,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBFileDescriptorProto__storage_, options),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBFileOptions),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "sourceCodeInfo",
-        .number = GPBFileDescriptorProto_FieldNumber_SourceCodeInfo,
-        .hasIndex = 10,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBFileDescriptorProto__storage_, sourceCodeInfo),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBSourceCodeInfo),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "publicDependencyArray",
-        .number = GPBFileDescriptorProto_FieldNumber_PublicDependencyArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBFileDescriptorProto__storage_, publicDependencyArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "weakDependencyArray",
-        .number = GPBFileDescriptorProto_FieldNumber_WeakDependencyArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBFileDescriptorProto__storage_, weakDependencyArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "syntax",
-        .number = GPBFileDescriptorProto_FieldNumber_Syntax,
-        .hasIndex = 11,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFileDescriptorProto__storage_, syntax),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBFileDescriptorProto class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBFileDescriptorProto__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBDescriptorProto
-
-@implementation GPBDescriptorProto
-
-@dynamic hasName, name;
-@dynamic fieldArray, fieldArray_Count;
-@dynamic extensionArray, extensionArray_Count;
-@dynamic nestedTypeArray, nestedTypeArray_Count;
-@dynamic enumTypeArray, enumTypeArray_Count;
-@dynamic extensionRangeArray, extensionRangeArray_Count;
-@dynamic oneofDeclArray, oneofDeclArray_Count;
-@dynamic hasOptions, options;
-@dynamic reservedRangeArray, reservedRangeArray_Count;
-@dynamic reservedNameArray, reservedNameArray_Count;
-
-typedef struct GPBDescriptorProto__storage_ {
-  uint32_t _has_storage_[1];
-  NSString *name;
-  NSMutableArray *fieldArray;
-  NSMutableArray *nestedTypeArray;
-  NSMutableArray *enumTypeArray;
-  NSMutableArray *extensionRangeArray;
-  NSMutableArray *extensionArray;
-  GPBMessageOptions *options;
-  NSMutableArray *oneofDeclArray;
-  NSMutableArray *reservedRangeArray;
-  NSMutableArray *reservedNameArray;
-} GPBDescriptorProto__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "name",
-        .number = GPBDescriptorProto_FieldNumber_Name,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBDescriptorProto__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "fieldArray",
-        .number = GPBDescriptorProto_FieldNumber_FieldArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBDescriptorProto__storage_, fieldArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBFieldDescriptorProto),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "nestedTypeArray",
-        .number = GPBDescriptorProto_FieldNumber_NestedTypeArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBDescriptorProto__storage_, nestedTypeArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBDescriptorProto),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "enumTypeArray",
-        .number = GPBDescriptorProto_FieldNumber_EnumTypeArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBDescriptorProto__storage_, enumTypeArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBEnumDescriptorProto),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "extensionRangeArray",
-        .number = GPBDescriptorProto_FieldNumber_ExtensionRangeArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBDescriptorProto__storage_, extensionRangeArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBDescriptorProto_ExtensionRange),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "extensionArray",
-        .number = GPBDescriptorProto_FieldNumber_ExtensionArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBDescriptorProto__storage_, extensionArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBFieldDescriptorProto),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "options",
-        .number = GPBDescriptorProto_FieldNumber_Options,
-        .hasIndex = 7,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBDescriptorProto__storage_, options),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBMessageOptions),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "oneofDeclArray",
-        .number = GPBDescriptorProto_FieldNumber_OneofDeclArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBDescriptorProto__storage_, oneofDeclArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBOneofDescriptorProto),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "reservedRangeArray",
-        .number = GPBDescriptorProto_FieldNumber_ReservedRangeArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBDescriptorProto__storage_, reservedRangeArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBDescriptorProto_ReservedRange),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "reservedNameArray",
-        .number = GPBDescriptorProto_FieldNumber_ReservedNameArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBDescriptorProto__storage_, reservedNameArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBDescriptorProto class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBDescriptorProto__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBDescriptorProto_ExtensionRange
-
-@implementation GPBDescriptorProto_ExtensionRange
-
-@dynamic hasStart, start;
-@dynamic hasEnd, end;
-
-typedef struct GPBDescriptorProto_ExtensionRange__storage_ {
-  uint32_t _has_storage_[1];
-  int32_t start;
-  int32_t end;
-} GPBDescriptorProto_ExtensionRange__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "start",
-        .number = GPBDescriptorProto_ExtensionRange_FieldNumber_Start,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBDescriptorProto_ExtensionRange__storage_, start),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "end",
-        .number = GPBDescriptorProto_ExtensionRange_FieldNumber_End,
-        .hasIndex = 1,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBDescriptorProto_ExtensionRange__storage_, end),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBDescriptorProto_ExtensionRange class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBDescriptorProto_ExtensionRange__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBDescriptorProto_ReservedRange
-
-@implementation GPBDescriptorProto_ReservedRange
-
-@dynamic hasStart, start;
-@dynamic hasEnd, end;
-
-typedef struct GPBDescriptorProto_ReservedRange__storage_ {
-  uint32_t _has_storage_[1];
-  int32_t start;
-  int32_t end;
-} GPBDescriptorProto_ReservedRange__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "start",
-        .number = GPBDescriptorProto_ReservedRange_FieldNumber_Start,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBDescriptorProto_ReservedRange__storage_, start),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "end",
-        .number = GPBDescriptorProto_ReservedRange_FieldNumber_End,
-        .hasIndex = 1,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBDescriptorProto_ReservedRange__storage_, end),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBDescriptorProto_ReservedRange class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBDescriptorProto_ReservedRange__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBFieldDescriptorProto
-
-@implementation GPBFieldDescriptorProto
-
-@dynamic hasName, name;
-@dynamic hasNumber, number;
-@dynamic hasLabel, label;
-@dynamic hasType, type;
-@dynamic hasTypeName, typeName;
-@dynamic hasExtendee, extendee;
-@dynamic hasDefaultValue, defaultValue;
-@dynamic hasOneofIndex, oneofIndex;
-@dynamic hasJsonName, jsonName;
-@dynamic hasOptions, options;
-
-typedef struct GPBFieldDescriptorProto__storage_ {
-  uint32_t _has_storage_[1];
-  int32_t number;
-  GPBFieldDescriptorProto_Label label;
-  GPBFieldDescriptorProto_Type type;
-  int32_t oneofIndex;
-  NSString *name;
-  NSString *extendee;
-  NSString *typeName;
-  NSString *defaultValue;
-  GPBFieldOptions *options;
-  NSString *jsonName;
-} GPBFieldDescriptorProto__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "name",
-        .number = GPBFieldDescriptorProto_FieldNumber_Name,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFieldDescriptorProto__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "extendee",
-        .number = GPBFieldDescriptorProto_FieldNumber_Extendee,
-        .hasIndex = 5,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFieldDescriptorProto__storage_, extendee),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "number",
-        .number = GPBFieldDescriptorProto_FieldNumber_Number,
-        .hasIndex = 1,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBFieldDescriptorProto__storage_, number),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "label",
-        .number = GPBFieldDescriptorProto_FieldNumber_Label,
-        .hasIndex = 2,
-        .flags = GPBFieldOptional | GPBFieldHasEnumDescriptor,
-        .dataType = GPBDataTypeEnum,
-        .offset = offsetof(GPBFieldDescriptorProto__storage_, label),
-        .defaultValue.valueEnum = GPBFieldDescriptorProto_Label_LabelOptional,
-        .dataTypeSpecific.enumDescFunc = GPBFieldDescriptorProto_Label_EnumDescriptor,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "type",
-        .number = GPBFieldDescriptorProto_FieldNumber_Type,
-        .hasIndex = 3,
-        .flags = GPBFieldOptional | GPBFieldHasEnumDescriptor,
-        .dataType = GPBDataTypeEnum,
-        .offset = offsetof(GPBFieldDescriptorProto__storage_, type),
-        .defaultValue.valueEnum = GPBFieldDescriptorProto_Type_TypeDouble,
-        .dataTypeSpecific.enumDescFunc = GPBFieldDescriptorProto_Type_EnumDescriptor,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "typeName",
-        .number = GPBFieldDescriptorProto_FieldNumber_TypeName,
-        .hasIndex = 4,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFieldDescriptorProto__storage_, typeName),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "defaultValue",
-        .number = GPBFieldDescriptorProto_FieldNumber_DefaultValue,
-        .hasIndex = 6,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFieldDescriptorProto__storage_, defaultValue),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "options",
-        .number = GPBFieldDescriptorProto_FieldNumber_Options,
-        .hasIndex = 9,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBFieldDescriptorProto__storage_, options),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBFieldOptions),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "oneofIndex",
-        .number = GPBFieldDescriptorProto_FieldNumber_OneofIndex,
-        .hasIndex = 7,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBFieldDescriptorProto__storage_, oneofIndex),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "jsonName",
-        .number = GPBFieldDescriptorProto_FieldNumber_JsonName,
-        .hasIndex = 8,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFieldDescriptorProto__storage_, jsonName),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-    };
-    static GPBMessageEnumDescription enums[] = {
-      { .enumDescriptorFunc = GPBFieldDescriptorProto_Type_EnumDescriptor },
-      { .enumDescriptorFunc = GPBFieldDescriptorProto_Label_EnumDescriptor },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBFieldDescriptorProto class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:enums
-                                     enumCount:sizeof(enums) / sizeof(GPBMessageEnumDescription)
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBFieldDescriptorProto__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - Enum GPBFieldDescriptorProto_Type
-
-GPBEnumDescriptor *GPBFieldDescriptorProto_Type_EnumDescriptor(void) {
-  static GPBEnumDescriptor *descriptor = NULL;
-  if (!descriptor) {
-    static GPBMessageEnumValueDescription values[] = {
-      { .name = "TypeDouble", .number = GPBFieldDescriptorProto_Type_TypeDouble },
-      { .name = "TypeFloat", .number = GPBFieldDescriptorProto_Type_TypeFloat },
-      { .name = "TypeInt64", .number = GPBFieldDescriptorProto_Type_TypeInt64 },
-      { .name = "TypeUint64", .number = GPBFieldDescriptorProto_Type_TypeUint64 },
-      { .name = "TypeInt32", .number = GPBFieldDescriptorProto_Type_TypeInt32 },
-      { .name = "TypeFixed64", .number = GPBFieldDescriptorProto_Type_TypeFixed64 },
-      { .name = "TypeFixed32", .number = GPBFieldDescriptorProto_Type_TypeFixed32 },
-      { .name = "TypeBool", .number = GPBFieldDescriptorProto_Type_TypeBool },
-      { .name = "TypeString", .number = GPBFieldDescriptorProto_Type_TypeString },
-      { .name = "TypeGroup", .number = GPBFieldDescriptorProto_Type_TypeGroup },
-      { .name = "TypeMessage", .number = GPBFieldDescriptorProto_Type_TypeMessage },
-      { .name = "TypeBytes", .number = GPBFieldDescriptorProto_Type_TypeBytes },
-      { .name = "TypeUint32", .number = GPBFieldDescriptorProto_Type_TypeUint32 },
-      { .name = "TypeEnum", .number = GPBFieldDescriptorProto_Type_TypeEnum },
-      { .name = "TypeSfixed32", .number = GPBFieldDescriptorProto_Type_TypeSfixed32 },
-      { .name = "TypeSfixed64", .number = GPBFieldDescriptorProto_Type_TypeSfixed64 },
-      { .name = "TypeSint32", .number = GPBFieldDescriptorProto_Type_TypeSint32 },
-      { .name = "TypeSint64", .number = GPBFieldDescriptorProto_Type_TypeSint64 },
-    };
-    descriptor = [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol(GPBFieldDescriptorProto_Type)
-                                                   values:values
-                                               valueCount:sizeof(values) / sizeof(GPBMessageEnumValueDescription)
-                                             enumVerifier:GPBFieldDescriptorProto_Type_IsValidValue];
-  }
-  return descriptor;
-}
-
-BOOL GPBFieldDescriptorProto_Type_IsValidValue(int32_t value__) {
-  switch (value__) {
-    case GPBFieldDescriptorProto_Type_TypeDouble:
-    case GPBFieldDescriptorProto_Type_TypeFloat:
-    case GPBFieldDescriptorProto_Type_TypeInt64:
-    case GPBFieldDescriptorProto_Type_TypeUint64:
-    case GPBFieldDescriptorProto_Type_TypeInt32:
-    case GPBFieldDescriptorProto_Type_TypeFixed64:
-    case GPBFieldDescriptorProto_Type_TypeFixed32:
-    case GPBFieldDescriptorProto_Type_TypeBool:
-    case GPBFieldDescriptorProto_Type_TypeString:
-    case GPBFieldDescriptorProto_Type_TypeGroup:
-    case GPBFieldDescriptorProto_Type_TypeMessage:
-    case GPBFieldDescriptorProto_Type_TypeBytes:
-    case GPBFieldDescriptorProto_Type_TypeUint32:
-    case GPBFieldDescriptorProto_Type_TypeEnum:
-    case GPBFieldDescriptorProto_Type_TypeSfixed32:
-    case GPBFieldDescriptorProto_Type_TypeSfixed64:
-    case GPBFieldDescriptorProto_Type_TypeSint32:
-    case GPBFieldDescriptorProto_Type_TypeSint64:
-      return YES;
-    default:
-      return NO;
-  }
-}
-
-#pragma mark - Enum GPBFieldDescriptorProto_Label
-
-GPBEnumDescriptor *GPBFieldDescriptorProto_Label_EnumDescriptor(void) {
-  static GPBEnumDescriptor *descriptor = NULL;
-  if (!descriptor) {
-    static GPBMessageEnumValueDescription values[] = {
-      { .name = "LabelOptional", .number = GPBFieldDescriptorProto_Label_LabelOptional },
-      { .name = "LabelRequired", .number = GPBFieldDescriptorProto_Label_LabelRequired },
-      { .name = "LabelRepeated", .number = GPBFieldDescriptorProto_Label_LabelRepeated },
-    };
-    descriptor = [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol(GPBFieldDescriptorProto_Label)
-                                                   values:values
-                                               valueCount:sizeof(values) / sizeof(GPBMessageEnumValueDescription)
-                                             enumVerifier:GPBFieldDescriptorProto_Label_IsValidValue];
-  }
-  return descriptor;
-}
-
-BOOL GPBFieldDescriptorProto_Label_IsValidValue(int32_t value__) {
-  switch (value__) {
-    case GPBFieldDescriptorProto_Label_LabelOptional:
-    case GPBFieldDescriptorProto_Label_LabelRequired:
-    case GPBFieldDescriptorProto_Label_LabelRepeated:
-      return YES;
-    default:
-      return NO;
-  }
-}
-
-#pragma mark - GPBOneofDescriptorProto
-
-@implementation GPBOneofDescriptorProto
-
-@dynamic hasName, name;
-
-typedef struct GPBOneofDescriptorProto__storage_ {
-  uint32_t _has_storage_[1];
-  NSString *name;
-} GPBOneofDescriptorProto__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "name",
-        .number = GPBOneofDescriptorProto_FieldNumber_Name,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBOneofDescriptorProto__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBOneofDescriptorProto class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBOneofDescriptorProto__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBEnumDescriptorProto
-
-@implementation GPBEnumDescriptorProto
-
-@dynamic hasName, name;
-@dynamic valueArray, valueArray_Count;
-@dynamic hasOptions, options;
-
-typedef struct GPBEnumDescriptorProto__storage_ {
-  uint32_t _has_storage_[1];
-  NSString *name;
-  NSMutableArray *valueArray;
-  GPBEnumOptions *options;
-} GPBEnumDescriptorProto__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "name",
-        .number = GPBEnumDescriptorProto_FieldNumber_Name,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBEnumDescriptorProto__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "valueArray",
-        .number = GPBEnumDescriptorProto_FieldNumber_ValueArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBEnumDescriptorProto__storage_, valueArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBEnumValueDescriptorProto),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "options",
-        .number = GPBEnumDescriptorProto_FieldNumber_Options,
-        .hasIndex = 2,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBEnumDescriptorProto__storage_, options),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBEnumOptions),
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBEnumDescriptorProto class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBEnumDescriptorProto__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBEnumValueDescriptorProto
-
-@implementation GPBEnumValueDescriptorProto
-
-@dynamic hasName, name;
-@dynamic hasNumber, number;
-@dynamic hasOptions, options;
-
-typedef struct GPBEnumValueDescriptorProto__storage_ {
-  uint32_t _has_storage_[1];
-  int32_t number;
-  NSString *name;
-  GPBEnumValueOptions *options;
-} GPBEnumValueDescriptorProto__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "name",
-        .number = GPBEnumValueDescriptorProto_FieldNumber_Name,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBEnumValueDescriptorProto__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "number",
-        .number = GPBEnumValueDescriptorProto_FieldNumber_Number,
-        .hasIndex = 1,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBEnumValueDescriptorProto__storage_, number),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "options",
-        .number = GPBEnumValueDescriptorProto_FieldNumber_Options,
-        .hasIndex = 2,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBEnumValueDescriptorProto__storage_, options),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBEnumValueOptions),
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBEnumValueDescriptorProto class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBEnumValueDescriptorProto__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBServiceDescriptorProto
-
-@implementation GPBServiceDescriptorProto
-
-@dynamic hasName, name;
-@dynamic methodArray, methodArray_Count;
-@dynamic hasOptions, options;
-
-typedef struct GPBServiceDescriptorProto__storage_ {
-  uint32_t _has_storage_[1];
-  NSString *name;
-  NSMutableArray *methodArray;
-  GPBServiceOptions *options;
-} GPBServiceDescriptorProto__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "name",
-        .number = GPBServiceDescriptorProto_FieldNumber_Name,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBServiceDescriptorProto__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "methodArray",
-        .number = GPBServiceDescriptorProto_FieldNumber_MethodArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBServiceDescriptorProto__storage_, methodArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBMethodDescriptorProto),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "options",
-        .number = GPBServiceDescriptorProto_FieldNumber_Options,
-        .hasIndex = 2,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBServiceDescriptorProto__storage_, options),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBServiceOptions),
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBServiceDescriptorProto class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBServiceDescriptorProto__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBMethodDescriptorProto
-
-@implementation GPBMethodDescriptorProto
-
-@dynamic hasName, name;
-@dynamic hasInputType, inputType;
-@dynamic hasOutputType, outputType;
-@dynamic hasOptions, options;
-@dynamic hasClientStreaming, clientStreaming;
-@dynamic hasServerStreaming, serverStreaming;
-
-typedef struct GPBMethodDescriptorProto__storage_ {
-  uint32_t _has_storage_[1];
-  BOOL clientStreaming;
-  BOOL serverStreaming;
-  NSString *name;
-  NSString *inputType;
-  NSString *outputType;
-  GPBMethodOptions *options;
-} GPBMethodDescriptorProto__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "name",
-        .number = GPBMethodDescriptorProto_FieldNumber_Name,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBMethodDescriptorProto__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "inputType",
-        .number = GPBMethodDescriptorProto_FieldNumber_InputType,
-        .hasIndex = 1,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBMethodDescriptorProto__storage_, inputType),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "outputType",
-        .number = GPBMethodDescriptorProto_FieldNumber_OutputType,
-        .hasIndex = 2,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBMethodDescriptorProto__storage_, outputType),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "options",
-        .number = GPBMethodDescriptorProto_FieldNumber_Options,
-        .hasIndex = 3,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBMethodDescriptorProto__storage_, options),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBMethodOptions),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "clientStreaming",
-        .number = GPBMethodDescriptorProto_FieldNumber_ClientStreaming,
-        .hasIndex = 4,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBMethodDescriptorProto__storage_, clientStreaming),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "serverStreaming",
-        .number = GPBMethodDescriptorProto_FieldNumber_ServerStreaming,
-        .hasIndex = 5,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBMethodDescriptorProto__storage_, serverStreaming),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBMethodDescriptorProto class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBMethodDescriptorProto__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBFileOptions
-
-@implementation GPBFileOptions
-
-@dynamic hasJavaPackage, javaPackage;
-@dynamic hasJavaOuterClassname, javaOuterClassname;
-@dynamic hasJavaMultipleFiles, javaMultipleFiles;
-@dynamic hasJavaGenerateEqualsAndHash, javaGenerateEqualsAndHash;
-@dynamic hasJavaStringCheckUtf8, javaStringCheckUtf8;
-@dynamic hasOptimizeFor, optimizeFor;
-@dynamic hasGoPackage, goPackage;
-@dynamic hasCcGenericServices, ccGenericServices;
-@dynamic hasJavaGenericServices, javaGenericServices;
-@dynamic hasPyGenericServices, pyGenericServices;
-@dynamic hasDeprecated, deprecated;
-@dynamic hasCcEnableArenas, ccEnableArenas;
-@dynamic hasObjcClassPrefix, objcClassPrefix;
-@dynamic hasCsharpNamespace, csharpNamespace;
-@dynamic hasJavananoUseDeprecatedPackage, javananoUseDeprecatedPackage;
-@dynamic uninterpretedOptionArray, uninterpretedOptionArray_Count;
-
-typedef struct GPBFileOptions__storage_ {
-  uint32_t _has_storage_[1];
-  BOOL javaMultipleFiles;
-  BOOL ccGenericServices;
-  BOOL javaGenericServices;
-  BOOL pyGenericServices;
-  BOOL javaGenerateEqualsAndHash;
-  BOOL deprecated;
-  BOOL javaStringCheckUtf8;
-  BOOL ccEnableArenas;
-  BOOL javananoUseDeprecatedPackage;
-  GPBFileOptions_OptimizeMode optimizeFor;
-  NSString *javaPackage;
-  NSString *javaOuterClassname;
-  NSString *goPackage;
-  NSString *objcClassPrefix;
-  NSString *csharpNamespace;
-  NSMutableArray *uninterpretedOptionArray;
-} GPBFileOptions__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "javaPackage",
-        .number = GPBFileOptions_FieldNumber_JavaPackage,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFileOptions__storage_, javaPackage),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "javaOuterClassname",
-        .number = GPBFileOptions_FieldNumber_JavaOuterClassname,
-        .hasIndex = 1,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFileOptions__storage_, javaOuterClassname),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "optimizeFor",
-        .number = GPBFileOptions_FieldNumber_OptimizeFor,
-        .hasIndex = 5,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue | GPBFieldHasEnumDescriptor,
-        .dataType = GPBDataTypeEnum,
-        .offset = offsetof(GPBFileOptions__storage_, optimizeFor),
-        .defaultValue.valueEnum = GPBFileOptions_OptimizeMode_Speed,
-        .dataTypeSpecific.enumDescFunc = GPBFileOptions_OptimizeMode_EnumDescriptor,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "javaMultipleFiles",
-        .number = GPBFileOptions_FieldNumber_JavaMultipleFiles,
-        .hasIndex = 2,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBFileOptions__storage_, javaMultipleFiles),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "goPackage",
-        .number = GPBFileOptions_FieldNumber_GoPackage,
-        .hasIndex = 6,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFileOptions__storage_, goPackage),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "ccGenericServices",
-        .number = GPBFileOptions_FieldNumber_CcGenericServices,
-        .hasIndex = 7,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBFileOptions__storage_, ccGenericServices),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "javaGenericServices",
-        .number = GPBFileOptions_FieldNumber_JavaGenericServices,
-        .hasIndex = 8,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBFileOptions__storage_, javaGenericServices),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "pyGenericServices",
-        .number = GPBFileOptions_FieldNumber_PyGenericServices,
-        .hasIndex = 9,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBFileOptions__storage_, pyGenericServices),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "javaGenerateEqualsAndHash",
-        .number = GPBFileOptions_FieldNumber_JavaGenerateEqualsAndHash,
-        .hasIndex = 3,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBFileOptions__storage_, javaGenerateEqualsAndHash),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "deprecated",
-        .number = GPBFileOptions_FieldNumber_Deprecated,
-        .hasIndex = 10,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBFileOptions__storage_, deprecated),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "javaStringCheckUtf8",
-        .number = GPBFileOptions_FieldNumber_JavaStringCheckUtf8,
-        .hasIndex = 4,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBFileOptions__storage_, javaStringCheckUtf8),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "ccEnableArenas",
-        .number = GPBFileOptions_FieldNumber_CcEnableArenas,
-        .hasIndex = 11,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBFileOptions__storage_, ccEnableArenas),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "objcClassPrefix",
-        .number = GPBFileOptions_FieldNumber_ObjcClassPrefix,
-        .hasIndex = 12,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFileOptions__storage_, objcClassPrefix),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "csharpNamespace",
-        .number = GPBFileOptions_FieldNumber_CsharpNamespace,
-        .hasIndex = 13,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFileOptions__storage_, csharpNamespace),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "javananoUseDeprecatedPackage",
-        .number = GPBFileOptions_FieldNumber_JavananoUseDeprecatedPackage,
-        .hasIndex = 14,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBFileOptions__storage_, javananoUseDeprecatedPackage),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-      #if GPBOBJC_INCLUDE_FIELD_OPTIONS
-        .fieldOptions = "\000\000\000\002\030\001",
-      #else
-        .fieldOptions = NULL,
-      #endif  // GPBOBJC_INCLUDE_FIELD_OPTIONS
-      },
-      {
-        .name = "uninterpretedOptionArray",
-        .number = GPBFileOptions_FieldNumber_UninterpretedOptionArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBFileOptions__storage_, uninterpretedOptionArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBUninterpretedOption),
-        .fieldOptions = NULL,
-      },
-    };
-    static GPBMessageEnumDescription enums[] = {
-      { .enumDescriptorFunc = GPBFileOptions_OptimizeMode_EnumDescriptor },
-    };
-    static GPBExtensionRange ranges[] = {
-      { .start = 1000, .end = 536870912 },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBFileOptions class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:enums
-                                     enumCount:sizeof(enums) / sizeof(GPBMessageEnumDescription)
-                                        ranges:ranges
-                                    rangeCount:sizeof(ranges) / sizeof(GPBExtensionRange)
-                                   storageSize:sizeof(GPBFileOptions__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - Enum GPBFileOptions_OptimizeMode
-
-GPBEnumDescriptor *GPBFileOptions_OptimizeMode_EnumDescriptor(void) {
-  static GPBEnumDescriptor *descriptor = NULL;
-  if (!descriptor) {
-    static GPBMessageEnumValueDescription values[] = {
-      { .name = "Speed", .number = GPBFileOptions_OptimizeMode_Speed },
-      { .name = "CodeSize", .number = GPBFileOptions_OptimizeMode_CodeSize },
-      { .name = "LiteRuntime", .number = GPBFileOptions_OptimizeMode_LiteRuntime },
-    };
-    descriptor = [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol(GPBFileOptions_OptimizeMode)
-                                                   values:values
-                                               valueCount:sizeof(values) / sizeof(GPBMessageEnumValueDescription)
-                                             enumVerifier:GPBFileOptions_OptimizeMode_IsValidValue];
-  }
-  return descriptor;
-}
-
-BOOL GPBFileOptions_OptimizeMode_IsValidValue(int32_t value__) {
-  switch (value__) {
-    case GPBFileOptions_OptimizeMode_Speed:
-    case GPBFileOptions_OptimizeMode_CodeSize:
-    case GPBFileOptions_OptimizeMode_LiteRuntime:
-      return YES;
-    default:
-      return NO;
-  }
-}
-
-#pragma mark - GPBMessageOptions
-
-@implementation GPBMessageOptions
-
-@dynamic hasMessageSetWireFormat, messageSetWireFormat;
-@dynamic hasNoStandardDescriptorAccessor, noStandardDescriptorAccessor;
-@dynamic hasDeprecated, deprecated;
-@dynamic hasMapEntry, mapEntry;
-@dynamic uninterpretedOptionArray, uninterpretedOptionArray_Count;
-
-typedef struct GPBMessageOptions__storage_ {
-  uint32_t _has_storage_[1];
-  BOOL messageSetWireFormat;
-  BOOL noStandardDescriptorAccessor;
-  BOOL deprecated;
-  BOOL mapEntry;
-  NSMutableArray *uninterpretedOptionArray;
-} GPBMessageOptions__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "messageSetWireFormat",
-        .number = GPBMessageOptions_FieldNumber_MessageSetWireFormat,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBMessageOptions__storage_, messageSetWireFormat),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "noStandardDescriptorAccessor",
-        .number = GPBMessageOptions_FieldNumber_NoStandardDescriptorAccessor,
-        .hasIndex = 1,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBMessageOptions__storage_, noStandardDescriptorAccessor),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "deprecated",
-        .number = GPBMessageOptions_FieldNumber_Deprecated,
-        .hasIndex = 2,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBMessageOptions__storage_, deprecated),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "mapEntry",
-        .number = GPBMessageOptions_FieldNumber_MapEntry,
-        .hasIndex = 3,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBMessageOptions__storage_, mapEntry),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "uninterpretedOptionArray",
-        .number = GPBMessageOptions_FieldNumber_UninterpretedOptionArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBMessageOptions__storage_, uninterpretedOptionArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBUninterpretedOption),
-        .fieldOptions = NULL,
-      },
-    };
-    static GPBExtensionRange ranges[] = {
-      { .start = 1000, .end = 536870912 },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBMessageOptions class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:ranges
-                                    rangeCount:sizeof(ranges) / sizeof(GPBExtensionRange)
-                                   storageSize:sizeof(GPBMessageOptions__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBFieldOptions
-
-@implementation GPBFieldOptions
-
-@dynamic hasCtype, ctype;
-@dynamic hasPacked, packed;
-@dynamic hasJstype, jstype;
-@dynamic hasLazy, lazy;
-@dynamic hasDeprecated, deprecated;
-@dynamic hasWeak, weak;
-@dynamic uninterpretedOptionArray, uninterpretedOptionArray_Count;
-
-typedef struct GPBFieldOptions__storage_ {
-  uint32_t _has_storage_[1];
-  BOOL packed;
-  BOOL deprecated;
-  BOOL lazy;
-  BOOL weak;
-  GPBFieldOptions_CType ctype;
-  GPBFieldOptions_JSType jstype;
-  NSMutableArray *uninterpretedOptionArray;
-} GPBFieldOptions__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "ctype",
-        .number = GPBFieldOptions_FieldNumber_Ctype,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue | GPBFieldHasEnumDescriptor,
-        .dataType = GPBDataTypeEnum,
-        .offset = offsetof(GPBFieldOptions__storage_, ctype),
-        .defaultValue.valueEnum = GPBFieldOptions_CType_String,
-        .dataTypeSpecific.enumDescFunc = GPBFieldOptions_CType_EnumDescriptor,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "packed",
-        .number = GPBFieldOptions_FieldNumber_Packed,
-        .hasIndex = 1,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBFieldOptions__storage_, packed),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "deprecated",
-        .number = GPBFieldOptions_FieldNumber_Deprecated,
-        .hasIndex = 4,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBFieldOptions__storage_, deprecated),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "lazy",
-        .number = GPBFieldOptions_FieldNumber_Lazy,
-        .hasIndex = 3,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBFieldOptions__storage_, lazy),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "jstype",
-        .number = GPBFieldOptions_FieldNumber_Jstype,
-        .hasIndex = 2,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue | GPBFieldHasEnumDescriptor,
-        .dataType = GPBDataTypeEnum,
-        .offset = offsetof(GPBFieldOptions__storage_, jstype),
-        .defaultValue.valueEnum = GPBFieldOptions_JSType_JsNormal,
-        .dataTypeSpecific.enumDescFunc = GPBFieldOptions_JSType_EnumDescriptor,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "weak",
-        .number = GPBFieldOptions_FieldNumber_Weak,
-        .hasIndex = 5,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBFieldOptions__storage_, weak),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "uninterpretedOptionArray",
-        .number = GPBFieldOptions_FieldNumber_UninterpretedOptionArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBFieldOptions__storage_, uninterpretedOptionArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBUninterpretedOption),
-        .fieldOptions = NULL,
-      },
-    };
-    static GPBMessageEnumDescription enums[] = {
-      { .enumDescriptorFunc = GPBFieldOptions_CType_EnumDescriptor },
-      { .enumDescriptorFunc = GPBFieldOptions_JSType_EnumDescriptor },
-    };
-    static GPBExtensionRange ranges[] = {
-      { .start = 1000, .end = 536870912 },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBFieldOptions class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:enums
-                                     enumCount:sizeof(enums) / sizeof(GPBMessageEnumDescription)
-                                        ranges:ranges
-                                    rangeCount:sizeof(ranges) / sizeof(GPBExtensionRange)
-                                   storageSize:sizeof(GPBFieldOptions__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - Enum GPBFieldOptions_CType
-
-GPBEnumDescriptor *GPBFieldOptions_CType_EnumDescriptor(void) {
-  static GPBEnumDescriptor *descriptor = NULL;
-  if (!descriptor) {
-    static GPBMessageEnumValueDescription values[] = {
-      { .name = "String", .number = GPBFieldOptions_CType_String },
-      { .name = "Cord", .number = GPBFieldOptions_CType_Cord },
-      { .name = "StringPiece", .number = GPBFieldOptions_CType_StringPiece },
-    };
-    descriptor = [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol(GPBFieldOptions_CType)
-                                                   values:values
-                                               valueCount:sizeof(values) / sizeof(GPBMessageEnumValueDescription)
-                                             enumVerifier:GPBFieldOptions_CType_IsValidValue];
-  }
-  return descriptor;
-}
-
-BOOL GPBFieldOptions_CType_IsValidValue(int32_t value__) {
-  switch (value__) {
-    case GPBFieldOptions_CType_String:
-    case GPBFieldOptions_CType_Cord:
-    case GPBFieldOptions_CType_StringPiece:
-      return YES;
-    default:
-      return NO;
-  }
-}
-
-#pragma mark - Enum GPBFieldOptions_JSType
-
-GPBEnumDescriptor *GPBFieldOptions_JSType_EnumDescriptor(void) {
-  static GPBEnumDescriptor *descriptor = NULL;
-  if (!descriptor) {
-    static GPBMessageEnumValueDescription values[] = {
-      { .name = "JsNormal", .number = GPBFieldOptions_JSType_JsNormal },
-      { .name = "JsString", .number = GPBFieldOptions_JSType_JsString },
-      { .name = "JsNumber", .number = GPBFieldOptions_JSType_JsNumber },
-    };
-    descriptor = [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol(GPBFieldOptions_JSType)
-                                                   values:values
-                                               valueCount:sizeof(values) / sizeof(GPBMessageEnumValueDescription)
-                                             enumVerifier:GPBFieldOptions_JSType_IsValidValue];
-  }
-  return descriptor;
-}
-
-BOOL GPBFieldOptions_JSType_IsValidValue(int32_t value__) {
-  switch (value__) {
-    case GPBFieldOptions_JSType_JsNormal:
-    case GPBFieldOptions_JSType_JsString:
-    case GPBFieldOptions_JSType_JsNumber:
-      return YES;
-    default:
-      return NO;
-  }
-}
-
-#pragma mark - GPBEnumOptions
-
-@implementation GPBEnumOptions
-
-@dynamic hasAllowAlias, allowAlias;
-@dynamic hasDeprecated, deprecated;
-@dynamic uninterpretedOptionArray, uninterpretedOptionArray_Count;
-
-typedef struct GPBEnumOptions__storage_ {
-  uint32_t _has_storage_[1];
-  BOOL allowAlias;
-  BOOL deprecated;
-  NSMutableArray *uninterpretedOptionArray;
-} GPBEnumOptions__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "allowAlias",
-        .number = GPBEnumOptions_FieldNumber_AllowAlias,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBEnumOptions__storage_, allowAlias),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "deprecated",
-        .number = GPBEnumOptions_FieldNumber_Deprecated,
-        .hasIndex = 1,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBEnumOptions__storage_, deprecated),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "uninterpretedOptionArray",
-        .number = GPBEnumOptions_FieldNumber_UninterpretedOptionArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBEnumOptions__storage_, uninterpretedOptionArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBUninterpretedOption),
-        .fieldOptions = NULL,
-      },
-    };
-    static GPBExtensionRange ranges[] = {
-      { .start = 1000, .end = 536870912 },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBEnumOptions class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:ranges
-                                    rangeCount:sizeof(ranges) / sizeof(GPBExtensionRange)
-                                   storageSize:sizeof(GPBEnumOptions__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBEnumValueOptions
-
-@implementation GPBEnumValueOptions
-
-@dynamic hasDeprecated, deprecated;
-@dynamic uninterpretedOptionArray, uninterpretedOptionArray_Count;
-
-typedef struct GPBEnumValueOptions__storage_ {
-  uint32_t _has_storage_[1];
-  BOOL deprecated;
-  NSMutableArray *uninterpretedOptionArray;
-} GPBEnumValueOptions__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "deprecated",
-        .number = GPBEnumValueOptions_FieldNumber_Deprecated,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBEnumValueOptions__storage_, deprecated),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "uninterpretedOptionArray",
-        .number = GPBEnumValueOptions_FieldNumber_UninterpretedOptionArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBEnumValueOptions__storage_, uninterpretedOptionArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBUninterpretedOption),
-        .fieldOptions = NULL,
-      },
-    };
-    static GPBExtensionRange ranges[] = {
-      { .start = 1000, .end = 536870912 },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBEnumValueOptions class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:ranges
-                                    rangeCount:sizeof(ranges) / sizeof(GPBExtensionRange)
-                                   storageSize:sizeof(GPBEnumValueOptions__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBServiceOptions
-
-@implementation GPBServiceOptions
-
-@dynamic hasDeprecated, deprecated;
-@dynamic uninterpretedOptionArray, uninterpretedOptionArray_Count;
-
-typedef struct GPBServiceOptions__storage_ {
-  uint32_t _has_storage_[1];
-  BOOL deprecated;
-  NSMutableArray *uninterpretedOptionArray;
-} GPBServiceOptions__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "deprecated",
-        .number = GPBServiceOptions_FieldNumber_Deprecated,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBServiceOptions__storage_, deprecated),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "uninterpretedOptionArray",
-        .number = GPBServiceOptions_FieldNumber_UninterpretedOptionArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBServiceOptions__storage_, uninterpretedOptionArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBUninterpretedOption),
-        .fieldOptions = NULL,
-      },
-    };
-    static GPBExtensionRange ranges[] = {
-      { .start = 1000, .end = 536870912 },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBServiceOptions class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:ranges
-                                    rangeCount:sizeof(ranges) / sizeof(GPBExtensionRange)
-                                   storageSize:sizeof(GPBServiceOptions__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBMethodOptions
-
-@implementation GPBMethodOptions
-
-@dynamic hasDeprecated, deprecated;
-@dynamic uninterpretedOptionArray, uninterpretedOptionArray_Count;
-
-typedef struct GPBMethodOptions__storage_ {
-  uint32_t _has_storage_[1];
-  BOOL deprecated;
-  NSMutableArray *uninterpretedOptionArray;
-} GPBMethodOptions__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "deprecated",
-        .number = GPBMethodOptions_FieldNumber_Deprecated,
-        .hasIndex = 0,
-        .flags = GPBFieldOptional | GPBFieldHasDefaultValue,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBMethodOptions__storage_, deprecated),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "uninterpretedOptionArray",
-        .number = GPBMethodOptions_FieldNumber_UninterpretedOptionArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBMethodOptions__storage_, uninterpretedOptionArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBUninterpretedOption),
-        .fieldOptions = NULL,
-      },
-    };
-    static GPBExtensionRange ranges[] = {
-      { .start = 1000, .end = 536870912 },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBMethodOptions class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:ranges
-                                    rangeCount:sizeof(ranges) / sizeof(GPBExtensionRange)
-                                   storageSize:sizeof(GPBMethodOptions__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBUninterpretedOption
-
-@implementation GPBUninterpretedOption
-
-@dynamic nameArray, nameArray_Count;
-@dynamic hasIdentifierValue, identifierValue;
-@dynamic hasPositiveIntValue, positiveIntValue;
-@dynamic hasNegativeIntValue, negativeIntValue;
-@dynamic hasDoubleValue, doubleValue;
-@dynamic hasStringValue, stringValue;
-@dynamic hasAggregateValue, aggregateValue;
-
-typedef struct GPBUninterpretedOption__storage_ {
-  uint32_t _has_storage_[1];
-  NSMutableArray *nameArray;
-  NSString *identifierValue;
-  NSData *stringValue;
-  NSString *aggregateValue;
-  uint64_t positiveIntValue;
-  int64_t negativeIntValue;
-  double doubleValue;
-} GPBUninterpretedOption__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "nameArray",
-        .number = GPBUninterpretedOption_FieldNumber_NameArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBUninterpretedOption__storage_, nameArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBUninterpretedOption_NamePart),
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "identifierValue",
-        .number = GPBUninterpretedOption_FieldNumber_IdentifierValue,
-        .hasIndex = 1,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBUninterpretedOption__storage_, identifierValue),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "positiveIntValue",
-        .number = GPBUninterpretedOption_FieldNumber_PositiveIntValue,
-        .hasIndex = 2,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeUInt64,
-        .offset = offsetof(GPBUninterpretedOption__storage_, positiveIntValue),
-        .defaultValue.valueUInt64 = 0ULL,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "negativeIntValue",
-        .number = GPBUninterpretedOption_FieldNumber_NegativeIntValue,
-        .hasIndex = 3,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeInt64,
-        .offset = offsetof(GPBUninterpretedOption__storage_, negativeIntValue),
-        .defaultValue.valueInt64 = 0LL,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "doubleValue",
-        .number = GPBUninterpretedOption_FieldNumber_DoubleValue,
-        .hasIndex = 4,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeDouble,
-        .offset = offsetof(GPBUninterpretedOption__storage_, doubleValue),
-        .defaultValue.valueDouble = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "stringValue",
-        .number = GPBUninterpretedOption_FieldNumber_StringValue,
-        .hasIndex = 5,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeBytes,
-        .offset = offsetof(GPBUninterpretedOption__storage_, stringValue),
-        .defaultValue.valueData = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "aggregateValue",
-        .number = GPBUninterpretedOption_FieldNumber_AggregateValue,
-        .hasIndex = 6,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBUninterpretedOption__storage_, aggregateValue),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBUninterpretedOption class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBUninterpretedOption__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBUninterpretedOption_NamePart
-
-@implementation GPBUninterpretedOption_NamePart
-
-@dynamic hasNamePart, namePart;
-@dynamic hasIsExtension, isExtension;
-
-typedef struct GPBUninterpretedOption_NamePart__storage_ {
-  uint32_t _has_storage_[1];
-  BOOL isExtension;
-  NSString *namePart;
-} GPBUninterpretedOption_NamePart__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "namePart",
-        .number = GPBUninterpretedOption_NamePart_FieldNumber_NamePart,
-        .hasIndex = 0,
-        .flags = GPBFieldRequired,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBUninterpretedOption_NamePart__storage_, namePart),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "isExtension",
-        .number = GPBUninterpretedOption_NamePart_FieldNumber_IsExtension,
-        .hasIndex = 1,
-        .flags = GPBFieldRequired,
-        .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBUninterpretedOption_NamePart__storage_, isExtension),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBUninterpretedOption_NamePart class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBUninterpretedOption_NamePart__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBSourceCodeInfo
-
-@implementation GPBSourceCodeInfo
-
-@dynamic locationArray, locationArray_Count;
-
-typedef struct GPBSourceCodeInfo__storage_ {
-  uint32_t _has_storage_[1];
-  NSMutableArray *locationArray;
-} GPBSourceCodeInfo__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "locationArray",
-        .number = GPBSourceCodeInfo_FieldNumber_LocationArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBSourceCodeInfo__storage_, locationArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBSourceCodeInfo_Location),
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBSourceCodeInfo class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBSourceCodeInfo__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBSourceCodeInfo_Location
-
-@implementation GPBSourceCodeInfo_Location
-
-@dynamic pathArray, pathArray_Count;
-@dynamic spanArray, spanArray_Count;
-@dynamic hasLeadingComments, leadingComments;
-@dynamic hasTrailingComments, trailingComments;
-@dynamic leadingDetachedCommentsArray, leadingDetachedCommentsArray_Count;
-
-typedef struct GPBSourceCodeInfo_Location__storage_ {
-  uint32_t _has_storage_[1];
-  GPBInt32Array *pathArray;
-  GPBInt32Array *spanArray;
-  NSString *leadingComments;
-  NSString *trailingComments;
-  NSMutableArray *leadingDetachedCommentsArray;
-} GPBSourceCodeInfo_Location__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "pathArray",
-        .number = GPBSourceCodeInfo_Location_FieldNumber_PathArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated | GPBFieldPacked,
-        .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBSourceCodeInfo_Location__storage_, pathArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = NULL,
-      #if GPBOBJC_INCLUDE_FIELD_OPTIONS
-        .fieldOptions = "\000\000\000\002\020\001",
-      #else
-        .fieldOptions = NULL,
-      #endif  // GPBOBJC_INCLUDE_FIELD_OPTIONS
-      },
-      {
-        .name = "spanArray",
-        .number = GPBSourceCodeInfo_Location_FieldNumber_SpanArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated | GPBFieldPacked,
-        .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBSourceCodeInfo_Location__storage_, spanArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = NULL,
-      #if GPBOBJC_INCLUDE_FIELD_OPTIONS
-        .fieldOptions = "\000\000\000\002\020\001",
-      #else
-        .fieldOptions = NULL,
-      #endif  // GPBOBJC_INCLUDE_FIELD_OPTIONS
-      },
-      {
-        .name = "leadingComments",
-        .number = GPBSourceCodeInfo_Location_FieldNumber_LeadingComments,
-        .hasIndex = 2,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBSourceCodeInfo_Location__storage_, leadingComments),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "trailingComments",
-        .number = GPBSourceCodeInfo_Location_FieldNumber_TrailingComments,
-        .hasIndex = 3,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBSourceCodeInfo_Location__storage_, trailingComments),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "leadingDetachedCommentsArray",
-        .number = GPBSourceCodeInfo_Location_FieldNumber_LeadingDetachedCommentsArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBSourceCodeInfo_Location__storage_, leadingDetachedCommentsArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBSourceCodeInfo_Location class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBSourceCodeInfo_Location__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBGeneratedCodeInfo
-
-@implementation GPBGeneratedCodeInfo
-
-@dynamic annotationArray, annotationArray_Count;
-
-typedef struct GPBGeneratedCodeInfo__storage_ {
-  uint32_t _has_storage_[1];
-  NSMutableArray *annotationArray;
-} GPBGeneratedCodeInfo__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "annotationArray",
-        .number = GPBGeneratedCodeInfo_FieldNumber_AnnotationArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated,
-        .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBGeneratedCodeInfo__storage_, annotationArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBGeneratedCodeInfo_Annotation),
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBGeneratedCodeInfo class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBGeneratedCodeInfo__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-#pragma mark - GPBGeneratedCodeInfo_Annotation
-
-@implementation GPBGeneratedCodeInfo_Annotation
-
-@dynamic pathArray, pathArray_Count;
-@dynamic hasSourceFile, sourceFile;
-@dynamic hasBegin, begin;
-@dynamic hasEnd, end;
-
-typedef struct GPBGeneratedCodeInfo_Annotation__storage_ {
-  uint32_t _has_storage_[1];
-  int32_t begin;
-  int32_t end;
-  GPBInt32Array *pathArray;
-  NSString *sourceFile;
-} GPBGeneratedCodeInfo_Annotation__storage_;
-
-// This method is threadsafe because it is initially called
-// in +initialize for each subclass.
-+ (GPBDescriptor *)descriptor {
-  static GPBDescriptor *descriptor = nil;
-  if (!descriptor) {
-    static GPBMessageFieldDescription fields[] = {
-      {
-        .name = "pathArray",
-        .number = GPBGeneratedCodeInfo_Annotation_FieldNumber_PathArray,
-        .hasIndex = GPBNoHasBit,
-        .flags = GPBFieldRepeated | GPBFieldPacked,
-        .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBGeneratedCodeInfo_Annotation__storage_, pathArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = NULL,
-      #if GPBOBJC_INCLUDE_FIELD_OPTIONS
-        .fieldOptions = "\000\000\000\002\020\001",
-      #else
-        .fieldOptions = NULL,
-      #endif  // GPBOBJC_INCLUDE_FIELD_OPTIONS
-      },
-      {
-        .name = "sourceFile",
-        .number = GPBGeneratedCodeInfo_Annotation_FieldNumber_SourceFile,
-        .hasIndex = 1,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBGeneratedCodeInfo_Annotation__storage_, sourceFile),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "begin",
-        .number = GPBGeneratedCodeInfo_Annotation_FieldNumber_Begin,
-        .hasIndex = 2,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBGeneratedCodeInfo_Annotation__storage_, begin),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-      {
-        .name = "end",
-        .number = GPBGeneratedCodeInfo_Annotation_FieldNumber_End,
-        .hasIndex = 3,
-        .flags = GPBFieldOptional,
-        .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBGeneratedCodeInfo_Annotation__storage_, end),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
-      },
-    };
-    GPBDescriptor *localDescriptor =
-        [GPBDescriptor allocDescriptorForClass:[GPBGeneratedCodeInfo_Annotation class]
-                                     rootClass:[GPBDescriptorRoot class]
-                                          file:GPBDescriptorRoot_FileDescriptor()
-                                        fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
-                                   storageSize:sizeof(GPBGeneratedCodeInfo_Annotation__storage_)
-                                    wireFormat:NO];
-    NSAssert(descriptor == nil, @"Startup recursed!");
-    descriptor = localDescriptor;
-  }
-  return descriptor;
-}
-
-@end
-
-
-// @@protoc_insertion_point(global_scope)
diff --git a/objectivec/google/protobuf/Duration.pbobjc.h b/objectivec/google/protobuf/Duration.pbobjc.h
index ebf9119..3685a61 100644
--- a/objectivec/google/protobuf/Duration.pbobjc.h
+++ b/objectivec/google/protobuf/Duration.pbobjc.h
@@ -3,7 +3,7 @@
 
 #import "GPBProtocolBuffers.h"
 
-#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
+#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30001
 #error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
diff --git a/objectivec/google/protobuf/Duration.pbobjc.m b/objectivec/google/protobuf/Duration.pbobjc.m
index e4fd495..bb79c7a 100644
--- a/objectivec/google/protobuf/Duration.pbobjc.m
+++ b/objectivec/google/protobuf/Duration.pbobjc.m
@@ -46,25 +46,21 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "seconds",
+        .dataTypeSpecific.className = NULL,
         .number = GPBDuration_FieldNumber_Seconds,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBDuration__storage_, seconds),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeInt64,
-        .offset = offsetof(GPBDuration__storage_, seconds),
-        .defaultValue.valueInt64 = 0LL,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "nanos",
+        .dataTypeSpecific.className = NULL,
         .number = GPBDuration_FieldNumber_Nanos,
         .hasIndex = 1,
+        .offset = (uint32_t)offsetof(GPBDuration__storage_, nanos),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBDuration__storage_, nanos),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -72,15 +68,9 @@
                                      rootClass:[GPBDurationRoot class]
                                           file:GPBDurationRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBDuration__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
diff --git a/objectivec/google/protobuf/Empty.pbobjc.h b/objectivec/google/protobuf/Empty.pbobjc.h
index ca09f71..6651ef7 100644
--- a/objectivec/google/protobuf/Empty.pbobjc.h
+++ b/objectivec/google/protobuf/Empty.pbobjc.h
@@ -3,7 +3,7 @@
 
 #import "GPBProtocolBuffers.h"
 
-#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
+#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30001
 #error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
diff --git a/objectivec/google/protobuf/Empty.pbobjc.m b/objectivec/google/protobuf/Empty.pbobjc.m
index 17f0c1a..5d7f8f1 100644
--- a/objectivec/google/protobuf/Empty.pbobjc.m
+++ b/objectivec/google/protobuf/Empty.pbobjc.m
@@ -31,7 +31,7 @@
 
 
 typedef struct GPBEmpty__storage_ {
-  uint32_t _has_storage_[0];
+  uint32_t _has_storage_[1];
 } GPBEmpty__storage_;
 
 // This method is threadsafe because it is initially called
@@ -45,14 +45,8 @@
                                           file:GPBEmptyRoot_FileDescriptor()
                                         fields:NULL
                                     fieldCount:0
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
                                    storageSize:sizeof(GPBEmpty__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
diff --git a/objectivec/google/protobuf/FieldMask.pbobjc.h b/objectivec/google/protobuf/FieldMask.pbobjc.h
index f861a98..931f664 100644
--- a/objectivec/google/protobuf/FieldMask.pbobjc.h
+++ b/objectivec/google/protobuf/FieldMask.pbobjc.h
@@ -3,7 +3,7 @@
 
 #import "GPBProtocolBuffers.h"
 
-#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
+#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30001
 #error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
diff --git a/objectivec/google/protobuf/FieldMask.pbobjc.m b/objectivec/google/protobuf/FieldMask.pbobjc.m
index f9684f5..36fc758 100644
--- a/objectivec/google/protobuf/FieldMask.pbobjc.m
+++ b/objectivec/google/protobuf/FieldMask.pbobjc.m
@@ -44,14 +44,12 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "pathsArray",
+        .dataTypeSpecific.className = NULL,
         .number = GPBFieldMask_FieldNumber_PathsArray,
         .hasIndex = GPBNoHasBit,
+        .offset = (uint32_t)offsetof(GPBFieldMask__storage_, pathsArray),
         .flags = GPBFieldRepeated,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBFieldMask__storage_, pathsArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -59,15 +57,9 @@
                                      rootClass:[GPBFieldMaskRoot class]
                                           file:GPBFieldMaskRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBFieldMask__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
diff --git a/objectivec/google/protobuf/SourceContext.pbobjc.h b/objectivec/google/protobuf/SourceContext.pbobjc.h
index 546db67..67b6d47 100644
--- a/objectivec/google/protobuf/SourceContext.pbobjc.h
+++ b/objectivec/google/protobuf/SourceContext.pbobjc.h
@@ -3,7 +3,7 @@
 
 #import "GPBProtocolBuffers.h"
 
-#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
+#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30001
 #error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
diff --git a/objectivec/google/protobuf/SourceContext.pbobjc.m b/objectivec/google/protobuf/SourceContext.pbobjc.m
index ac1827f..4e8bf3d 100644
--- a/objectivec/google/protobuf/SourceContext.pbobjc.m
+++ b/objectivec/google/protobuf/SourceContext.pbobjc.m
@@ -44,14 +44,12 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "fileName",
+        .dataTypeSpecific.className = NULL,
         .number = GPBSourceContext_FieldNumber_FileName,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBSourceContext__storage_, fileName),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBSourceContext__storage_, fileName),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -59,15 +57,9 @@
                                      rootClass:[GPBSourceContextRoot class]
                                           file:GPBSourceContextRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBSourceContext__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
diff --git a/objectivec/google/protobuf/Struct.pbobjc.h b/objectivec/google/protobuf/Struct.pbobjc.h
index 7b9c45a..e2388e2 100644
--- a/objectivec/google/protobuf/Struct.pbobjc.h
+++ b/objectivec/google/protobuf/Struct.pbobjc.h
@@ -3,7 +3,7 @@
 
 #import "GPBProtocolBuffers.h"
 
-#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
+#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30001
 #error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
diff --git a/objectivec/google/protobuf/Struct.pbobjc.m b/objectivec/google/protobuf/Struct.pbobjc.m
index 14b8f27..0601a4b 100644
--- a/objectivec/google/protobuf/Struct.pbobjc.m
+++ b/objectivec/google/protobuf/Struct.pbobjc.m
@@ -30,13 +30,20 @@
 GPBEnumDescriptor *GPBNullValue_EnumDescriptor(void) {
   static GPBEnumDescriptor *descriptor = NULL;
   if (!descriptor) {
-    static GPBMessageEnumValueDescription values[] = {
-      { .name = "NullValue", .number = GPBNullValue_NullValue },
+    static const char *valueNames =
+        "NullValue\000";
+    static const int32_t values[] = {
+        GPBNullValue_NullValue,
     };
-    descriptor = [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol(GPBNullValue)
-                                                   values:values
-                                               valueCount:sizeof(values) / sizeof(GPBMessageEnumValueDescription)
-                                             enumVerifier:GPBNullValue_IsValidValue];
+    GPBEnumDescriptor *worker =
+        [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol(GPBNullValue)
+                                       valueNames:valueNames
+                                           values:values
+                                            count:(uint32_t)(sizeof(values) / sizeof(int32_t))
+                                     enumVerifier:GPBNullValue_IsValidValue];
+    if (!OSAtomicCompareAndSwapPtrBarrier(nil, worker, (void * volatile *)&descriptor)) {
+      [worker release];
+    }
   }
   return descriptor;
 }
@@ -69,14 +76,12 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "fields",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBValue),
         .number = GPBStruct_FieldNumber_Fields,
         .hasIndex = GPBNoHasBit,
+        .offset = (uint32_t)offsetof(GPBStruct__storage_, fields),
         .flags = GPBFieldMapKeyString,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBStruct__storage_, fields),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBValue),
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -84,15 +89,9 @@
                                      rootClass:[GPBStructRoot class]
                                           file:GPBStructRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBStruct__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -115,7 +114,6 @@
 
 typedef struct GPBValue__storage_ {
   uint32_t _has_storage_[2];
-  BOOL boolValue;
   GPBNullValue nullValue;
   NSString *stringValue;
   GPBStruct *structValue;
@@ -128,78 +126,60 @@
 + (GPBDescriptor *)descriptor {
   static GPBDescriptor *descriptor = nil;
   if (!descriptor) {
-    static GPBMessageOneofDescription oneofs[] = {
-      {
-        .name = "kind",
-        .index = -1,
-      },
-    };
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "nullValue",
+        .dataTypeSpecific.enumDescFunc = GPBNullValue_EnumDescriptor,
         .number = GPBValue_FieldNumber_NullValue,
         .hasIndex = -1,
+        .offset = (uint32_t)offsetof(GPBValue__storage_, nullValue),
         .flags = GPBFieldOptional | GPBFieldHasEnumDescriptor,
         .dataType = GPBDataTypeEnum,
-        .offset = offsetof(GPBValue__storage_, nullValue),
-        .defaultValue.valueEnum = GPBNullValue_NullValue,
-        .dataTypeSpecific.enumDescFunc = GPBNullValue_EnumDescriptor,
-        .fieldOptions = NULL,
       },
       {
         .name = "numberValue",
+        .dataTypeSpecific.className = NULL,
         .number = GPBValue_FieldNumber_NumberValue,
         .hasIndex = -1,
+        .offset = (uint32_t)offsetof(GPBValue__storage_, numberValue),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeDouble,
-        .offset = offsetof(GPBValue__storage_, numberValue),
-        .defaultValue.valueDouble = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "stringValue",
+        .dataTypeSpecific.className = NULL,
         .number = GPBValue_FieldNumber_StringValue,
         .hasIndex = -1,
+        .offset = (uint32_t)offsetof(GPBValue__storage_, stringValue),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBValue__storage_, stringValue),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "boolValue",
+        .dataTypeSpecific.className = NULL,
         .number = GPBValue_FieldNumber_BoolValue,
         .hasIndex = -1,
+        .offset = 0,  // Stored in _has_storage_ to save space.
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBValue__storage_, boolValue),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "structValue",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBStruct),
         .number = GPBValue_FieldNumber_StructValue,
         .hasIndex = -1,
+        .offset = (uint32_t)offsetof(GPBValue__storage_, structValue),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBValue__storage_, structValue),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBStruct),
-        .fieldOptions = NULL,
       },
       {
         .name = "listValue",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBListValue),
         .number = GPBValue_FieldNumber_ListValue,
         .hasIndex = -1,
+        .offset = (uint32_t)offsetof(GPBValue__storage_, listValue),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBValue__storage_, listValue),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBListValue),
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -207,15 +187,15 @@
                                      rootClass:[GPBStructRoot class]
                                           file:GPBStructRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:oneofs
-                                    oneofCount:sizeof(oneofs) / sizeof(GPBMessageOneofDescription)
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBValue__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
+    static const char *oneofs[] = {
+      "kind",
+    };
+    [localDescriptor setupOneofs:oneofs
+                           count:(uint32_t)(sizeof(oneofs) / sizeof(char*))
+                   firstHasIndex:-1];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -239,7 +219,7 @@
 void GPBValue_ClearKindOneOfCase(GPBValue *message) {
   GPBDescriptor *descriptor = [message descriptor];
   GPBOneofDescriptor *oneof = descriptor->oneofs_[0];
-  GPBMaybeClearOneof(message, oneof, 0);
+  GPBMaybeClearOneof(message, oneof, -1, 0);
 }
 #pragma mark - GPBListValue
 
@@ -260,14 +240,12 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "valuesArray",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBValue),
         .number = GPBListValue_FieldNumber_ValuesArray,
         .hasIndex = GPBNoHasBit,
+        .offset = (uint32_t)offsetof(GPBListValue__storage_, valuesArray),
         .flags = GPBFieldRepeated,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBListValue__storage_, valuesArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBValue),
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -275,15 +253,9 @@
                                      rootClass:[GPBStructRoot class]
                                           file:GPBStructRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBListValue__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
diff --git a/objectivec/google/protobuf/Timestamp.pbobjc.h b/objectivec/google/protobuf/Timestamp.pbobjc.h
index d17c286..b66b323 100644
--- a/objectivec/google/protobuf/Timestamp.pbobjc.h
+++ b/objectivec/google/protobuf/Timestamp.pbobjc.h
@@ -3,7 +3,7 @@
 
 #import "GPBProtocolBuffers.h"
 
-#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
+#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30001
 #error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
diff --git a/objectivec/google/protobuf/Timestamp.pbobjc.m b/objectivec/google/protobuf/Timestamp.pbobjc.m
index a206f15..1416115 100644
--- a/objectivec/google/protobuf/Timestamp.pbobjc.m
+++ b/objectivec/google/protobuf/Timestamp.pbobjc.m
@@ -46,25 +46,21 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "seconds",
+        .dataTypeSpecific.className = NULL,
         .number = GPBTimestamp_FieldNumber_Seconds,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBTimestamp__storage_, seconds),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeInt64,
-        .offset = offsetof(GPBTimestamp__storage_, seconds),
-        .defaultValue.valueInt64 = 0LL,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "nanos",
+        .dataTypeSpecific.className = NULL,
         .number = GPBTimestamp_FieldNumber_Nanos,
         .hasIndex = 1,
+        .offset = (uint32_t)offsetof(GPBTimestamp__storage_, nanos),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBTimestamp__storage_, nanos),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -72,15 +68,9 @@
                                      rootClass:[GPBTimestampRoot class]
                                           file:GPBTimestampRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBTimestamp__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
diff --git a/objectivec/google/protobuf/Type.pbobjc.h b/objectivec/google/protobuf/Type.pbobjc.h
index 9301e4f..efaeab3 100644
--- a/objectivec/google/protobuf/Type.pbobjc.h
+++ b/objectivec/google/protobuf/Type.pbobjc.h
@@ -3,7 +3,7 @@
 
 #import "GPBProtocolBuffers.h"
 
-#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
+#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30001
 #error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
diff --git a/objectivec/google/protobuf/Type.pbobjc.m b/objectivec/google/protobuf/Type.pbobjc.m
index b4e0a5f..175c023 100644
--- a/objectivec/google/protobuf/Type.pbobjc.m
+++ b/objectivec/google/protobuf/Type.pbobjc.m
@@ -45,14 +45,21 @@
 GPBEnumDescriptor *GPBSyntax_EnumDescriptor(void) {
   static GPBEnumDescriptor *descriptor = NULL;
   if (!descriptor) {
-    static GPBMessageEnumValueDescription values[] = {
-      { .name = "SyntaxProto2", .number = GPBSyntax_SyntaxProto2 },
-      { .name = "SyntaxProto3", .number = GPBSyntax_SyntaxProto3 },
+    static const char *valueNames =
+        "SyntaxProto2\000SyntaxProto3\000";
+    static const int32_t values[] = {
+        GPBSyntax_SyntaxProto2,
+        GPBSyntax_SyntaxProto3,
     };
-    descriptor = [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol(GPBSyntax)
-                                                   values:values
-                                               valueCount:sizeof(values) / sizeof(GPBMessageEnumValueDescription)
-                                             enumVerifier:GPBSyntax_IsValidValue];
+    GPBEnumDescriptor *worker =
+        [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol(GPBSyntax)
+                                       valueNames:valueNames
+                                           values:values
+                                            count:(uint32_t)(sizeof(values) / sizeof(int32_t))
+                                     enumVerifier:GPBSyntax_IsValidValue];
+    if (!OSAtomicCompareAndSwapPtrBarrier(nil, worker, (void * volatile *)&descriptor)) {
+      [worker release];
+    }
   }
   return descriptor;
 }
@@ -96,69 +103,57 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "name",
+        .dataTypeSpecific.className = NULL,
         .number = GPBType_FieldNumber_Name,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBType__storage_, name),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBType__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "fieldsArray",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBField),
         .number = GPBType_FieldNumber_FieldsArray,
         .hasIndex = GPBNoHasBit,
+        .offset = (uint32_t)offsetof(GPBType__storage_, fieldsArray),
         .flags = GPBFieldRepeated,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBType__storage_, fieldsArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBField),
-        .fieldOptions = NULL,
       },
       {
         .name = "oneofsArray",
+        .dataTypeSpecific.className = NULL,
         .number = GPBType_FieldNumber_OneofsArray,
         .hasIndex = GPBNoHasBit,
+        .offset = (uint32_t)offsetof(GPBType__storage_, oneofsArray),
         .flags = GPBFieldRepeated,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBType__storage_, oneofsArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "optionsArray",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBOption),
         .number = GPBType_FieldNumber_OptionsArray,
         .hasIndex = GPBNoHasBit,
+        .offset = (uint32_t)offsetof(GPBType__storage_, optionsArray),
         .flags = GPBFieldRepeated,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBType__storage_, optionsArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBOption),
-        .fieldOptions = NULL,
       },
       {
         .name = "sourceContext",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBSourceContext),
         .number = GPBType_FieldNumber_SourceContext,
-        .hasIndex = 4,
+        .hasIndex = 1,
+        .offset = (uint32_t)offsetof(GPBType__storage_, sourceContext),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBType__storage_, sourceContext),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBSourceContext),
-        .fieldOptions = NULL,
       },
       {
         .name = "syntax",
+        .dataTypeSpecific.enumDescFunc = GPBSyntax_EnumDescriptor,
         .number = GPBType_FieldNumber_Syntax,
-        .hasIndex = 5,
+        .hasIndex = 2,
+        .offset = (uint32_t)offsetof(GPBType__storage_, syntax),
         .flags = GPBFieldOptional | GPBFieldHasEnumDescriptor,
         .dataType = GPBDataTypeEnum,
-        .offset = offsetof(GPBType__storage_, syntax),
-        .defaultValue.valueEnum = GPBSyntax_SyntaxProto2,
-        .dataTypeSpecific.enumDescFunc = GPBSyntax_EnumDescriptor,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -166,15 +161,9 @@
                                      rootClass:[GPBTypeRoot class]
                                           file:GPBTypeRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBType__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -212,7 +201,6 @@
 
 typedef struct GPBField__storage_ {
   uint32_t _has_storage_[1];
-  BOOL packed;
   GPBField_Kind kind;
   GPBField_Cardinality cardinality;
   int32_t number;
@@ -232,139 +220,108 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "kind",
+        .dataTypeSpecific.enumDescFunc = GPBField_Kind_EnumDescriptor,
         .number = GPBField_FieldNumber_Kind,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBField__storage_, kind),
         .flags = GPBFieldOptional | GPBFieldHasEnumDescriptor,
         .dataType = GPBDataTypeEnum,
-        .offset = offsetof(GPBField__storage_, kind),
-        .defaultValue.valueEnum = GPBField_Kind_TypeUnknown,
-        .dataTypeSpecific.enumDescFunc = GPBField_Kind_EnumDescriptor,
-        .fieldOptions = NULL,
       },
       {
         .name = "cardinality",
+        .dataTypeSpecific.enumDescFunc = GPBField_Cardinality_EnumDescriptor,
         .number = GPBField_FieldNumber_Cardinality,
         .hasIndex = 1,
+        .offset = (uint32_t)offsetof(GPBField__storage_, cardinality),
         .flags = GPBFieldOptional | GPBFieldHasEnumDescriptor,
         .dataType = GPBDataTypeEnum,
-        .offset = offsetof(GPBField__storage_, cardinality),
-        .defaultValue.valueEnum = GPBField_Cardinality_CardinalityUnknown,
-        .dataTypeSpecific.enumDescFunc = GPBField_Cardinality_EnumDescriptor,
-        .fieldOptions = NULL,
       },
       {
         .name = "number",
+        .dataTypeSpecific.className = NULL,
         .number = GPBField_FieldNumber_Number,
         .hasIndex = 2,
+        .offset = (uint32_t)offsetof(GPBField__storage_, number),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBField__storage_, number),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "name",
+        .dataTypeSpecific.className = NULL,
         .number = GPBField_FieldNumber_Name,
         .hasIndex = 3,
+        .offset = (uint32_t)offsetof(GPBField__storage_, name),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBField__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "typeURL",
+        .dataTypeSpecific.className = NULL,
         .number = GPBField_FieldNumber_TypeURL,
         .hasIndex = 4,
+        .offset = (uint32_t)offsetof(GPBField__storage_, typeURL),
         .flags = GPBFieldOptional | GPBFieldTextFormatNameCustom,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBField__storage_, typeURL),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "oneofIndex",
+        .dataTypeSpecific.className = NULL,
         .number = GPBField_FieldNumber_OneofIndex,
         .hasIndex = 5,
+        .offset = (uint32_t)offsetof(GPBField__storage_, oneofIndex),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBField__storage_, oneofIndex),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "packed",
+        .dataTypeSpecific.className = NULL,
         .number = GPBField_FieldNumber_Packed,
         .hasIndex = 6,
+        .offset = 7,  // Stored in _has_storage_ to save space.
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBField__storage_, packed),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "optionsArray",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBOption),
         .number = GPBField_FieldNumber_OptionsArray,
         .hasIndex = GPBNoHasBit,
+        .offset = (uint32_t)offsetof(GPBField__storage_, optionsArray),
         .flags = GPBFieldRepeated,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBField__storage_, optionsArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBOption),
-        .fieldOptions = NULL,
       },
       {
         .name = "jsonName",
+        .dataTypeSpecific.className = NULL,
         .number = GPBField_FieldNumber_JsonName,
         .hasIndex = 8,
+        .offset = (uint32_t)offsetof(GPBField__storage_, jsonName),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBField__storage_, jsonName),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "defaultValue",
+        .dataTypeSpecific.className = NULL,
         .number = GPBField_FieldNumber_DefaultValue,
         .hasIndex = 9,
+        .offset = (uint32_t)offsetof(GPBField__storage_, defaultValue),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBField__storage_, defaultValue),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
-    static GPBMessageEnumDescription enums[] = {
-      { .enumDescriptorFunc = GPBField_Kind_EnumDescriptor },
-      { .enumDescriptorFunc = GPBField_Cardinality_EnumDescriptor },
-    };
-#if GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS
-    const char *extraTextFormatInfo = NULL;
-#else
-    static const char *extraTextFormatInfo = "\001\006\004\241!!\000";
-#endif  // GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS
     GPBDescriptor *localDescriptor =
         [GPBDescriptor allocDescriptorForClass:[GPBField class]
                                      rootClass:[GPBTypeRoot class]
                                           file:GPBTypeRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:enums
-                                     enumCount:sizeof(enums) / sizeof(GPBMessageEnumDescription)
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBField__storage_)
-                                    wireFormat:NO
-                           extraTextFormatInfo:extraTextFormatInfo];
+                                         flags:0];
+#if !GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS
+    static const char *extraTextFormatInfo =
+        "\001\006\004\241!!\000";
+    [localDescriptor setupExtraTextInfo:extraTextFormatInfo];
+#endif  // !GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -402,31 +359,43 @@
 GPBEnumDescriptor *GPBField_Kind_EnumDescriptor(void) {
   static GPBEnumDescriptor *descriptor = NULL;
   if (!descriptor) {
-    static GPBMessageEnumValueDescription values[] = {
-      { .name = "TypeUnknown", .number = GPBField_Kind_TypeUnknown },
-      { .name = "TypeDouble", .number = GPBField_Kind_TypeDouble },
-      { .name = "TypeFloat", .number = GPBField_Kind_TypeFloat },
-      { .name = "TypeInt64", .number = GPBField_Kind_TypeInt64 },
-      { .name = "TypeUint64", .number = GPBField_Kind_TypeUint64 },
-      { .name = "TypeInt32", .number = GPBField_Kind_TypeInt32 },
-      { .name = "TypeFixed64", .number = GPBField_Kind_TypeFixed64 },
-      { .name = "TypeFixed32", .number = GPBField_Kind_TypeFixed32 },
-      { .name = "TypeBool", .number = GPBField_Kind_TypeBool },
-      { .name = "TypeString", .number = GPBField_Kind_TypeString },
-      { .name = "TypeGroup", .number = GPBField_Kind_TypeGroup },
-      { .name = "TypeMessage", .number = GPBField_Kind_TypeMessage },
-      { .name = "TypeBytes", .number = GPBField_Kind_TypeBytes },
-      { .name = "TypeUint32", .number = GPBField_Kind_TypeUint32 },
-      { .name = "TypeEnum", .number = GPBField_Kind_TypeEnum },
-      { .name = "TypeSfixed32", .number = GPBField_Kind_TypeSfixed32 },
-      { .name = "TypeSfixed64", .number = GPBField_Kind_TypeSfixed64 },
-      { .name = "TypeSint32", .number = GPBField_Kind_TypeSint32 },
-      { .name = "TypeSint64", .number = GPBField_Kind_TypeSint64 },
+    static const char *valueNames =
+        "TypeUnknown\000TypeDouble\000TypeFloat\000TypeInt"
+        "64\000TypeUint64\000TypeInt32\000TypeFixed64\000Type"
+        "Fixed32\000TypeBool\000TypeString\000TypeGroup\000Ty"
+        "peMessage\000TypeBytes\000TypeUint32\000TypeEnum\000"
+        "TypeSfixed32\000TypeSfixed64\000TypeSint32\000Typ"
+        "eSint64\000";
+    static const int32_t values[] = {
+        GPBField_Kind_TypeUnknown,
+        GPBField_Kind_TypeDouble,
+        GPBField_Kind_TypeFloat,
+        GPBField_Kind_TypeInt64,
+        GPBField_Kind_TypeUint64,
+        GPBField_Kind_TypeInt32,
+        GPBField_Kind_TypeFixed64,
+        GPBField_Kind_TypeFixed32,
+        GPBField_Kind_TypeBool,
+        GPBField_Kind_TypeString,
+        GPBField_Kind_TypeGroup,
+        GPBField_Kind_TypeMessage,
+        GPBField_Kind_TypeBytes,
+        GPBField_Kind_TypeUint32,
+        GPBField_Kind_TypeEnum,
+        GPBField_Kind_TypeSfixed32,
+        GPBField_Kind_TypeSfixed64,
+        GPBField_Kind_TypeSint32,
+        GPBField_Kind_TypeSint64,
     };
-    descriptor = [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol(GPBField_Kind)
-                                                   values:values
-                                               valueCount:sizeof(values) / sizeof(GPBMessageEnumValueDescription)
-                                             enumVerifier:GPBField_Kind_IsValidValue];
+    GPBEnumDescriptor *worker =
+        [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol(GPBField_Kind)
+                                       valueNames:valueNames
+                                           values:values
+                                            count:(uint32_t)(sizeof(values) / sizeof(int32_t))
+                                     enumVerifier:GPBField_Kind_IsValidValue];
+    if (!OSAtomicCompareAndSwapPtrBarrier(nil, worker, (void * volatile *)&descriptor)) {
+      [worker release];
+    }
   }
   return descriptor;
 }
@@ -463,16 +432,24 @@
 GPBEnumDescriptor *GPBField_Cardinality_EnumDescriptor(void) {
   static GPBEnumDescriptor *descriptor = NULL;
   if (!descriptor) {
-    static GPBMessageEnumValueDescription values[] = {
-      { .name = "CardinalityUnknown", .number = GPBField_Cardinality_CardinalityUnknown },
-      { .name = "CardinalityOptional", .number = GPBField_Cardinality_CardinalityOptional },
-      { .name = "CardinalityRequired", .number = GPBField_Cardinality_CardinalityRequired },
-      { .name = "CardinalityRepeated", .number = GPBField_Cardinality_CardinalityRepeated },
+    static const char *valueNames =
+        "CardinalityUnknown\000CardinalityOptional\000C"
+        "ardinalityRequired\000CardinalityRepeated\000";
+    static const int32_t values[] = {
+        GPBField_Cardinality_CardinalityUnknown,
+        GPBField_Cardinality_CardinalityOptional,
+        GPBField_Cardinality_CardinalityRequired,
+        GPBField_Cardinality_CardinalityRepeated,
     };
-    descriptor = [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol(GPBField_Cardinality)
-                                                   values:values
-                                               valueCount:sizeof(values) / sizeof(GPBMessageEnumValueDescription)
-                                             enumVerifier:GPBField_Cardinality_IsValidValue];
+    GPBEnumDescriptor *worker =
+        [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol(GPBField_Cardinality)
+                                       valueNames:valueNames
+                                           values:values
+                                            count:(uint32_t)(sizeof(values) / sizeof(int32_t))
+                                     enumVerifier:GPBField_Cardinality_IsValidValue];
+    if (!OSAtomicCompareAndSwapPtrBarrier(nil, worker, (void * volatile *)&descriptor)) {
+      [worker release];
+    }
   }
   return descriptor;
 }
@@ -516,58 +493,48 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "name",
+        .dataTypeSpecific.className = NULL,
         .number = GPBEnum_FieldNumber_Name,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBEnum__storage_, name),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBEnum__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "enumvalueArray",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBEnumValue),
         .number = GPBEnum_FieldNumber_EnumvalueArray,
         .hasIndex = GPBNoHasBit,
+        .offset = (uint32_t)offsetof(GPBEnum__storage_, enumvalueArray),
         .flags = GPBFieldRepeated,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBEnum__storage_, enumvalueArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBEnumValue),
-        .fieldOptions = NULL,
       },
       {
         .name = "optionsArray",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBOption),
         .number = GPBEnum_FieldNumber_OptionsArray,
         .hasIndex = GPBNoHasBit,
+        .offset = (uint32_t)offsetof(GPBEnum__storage_, optionsArray),
         .flags = GPBFieldRepeated,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBEnum__storage_, optionsArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBOption),
-        .fieldOptions = NULL,
       },
       {
         .name = "sourceContext",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBSourceContext),
         .number = GPBEnum_FieldNumber_SourceContext,
-        .hasIndex = 3,
+        .hasIndex = 1,
+        .offset = (uint32_t)offsetof(GPBEnum__storage_, sourceContext),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBEnum__storage_, sourceContext),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBSourceContext),
-        .fieldOptions = NULL,
       },
       {
         .name = "syntax",
+        .dataTypeSpecific.enumDescFunc = GPBSyntax_EnumDescriptor,
         .number = GPBEnum_FieldNumber_Syntax,
-        .hasIndex = 4,
+        .hasIndex = 2,
+        .offset = (uint32_t)offsetof(GPBEnum__storage_, syntax),
         .flags = GPBFieldOptional | GPBFieldHasEnumDescriptor,
         .dataType = GPBDataTypeEnum,
-        .offset = offsetof(GPBEnum__storage_, syntax),
-        .defaultValue.valueEnum = GPBSyntax_SyntaxProto2,
-        .dataTypeSpecific.enumDescFunc = GPBSyntax_EnumDescriptor,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -575,15 +542,9 @@
                                      rootClass:[GPBTypeRoot class]
                                           file:GPBTypeRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBEnum__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -627,36 +588,30 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "name",
+        .dataTypeSpecific.className = NULL,
         .number = GPBEnumValue_FieldNumber_Name,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBEnumValue__storage_, name),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBEnumValue__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "number",
+        .dataTypeSpecific.className = NULL,
         .number = GPBEnumValue_FieldNumber_Number,
         .hasIndex = 1,
+        .offset = (uint32_t)offsetof(GPBEnumValue__storage_, number),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBEnumValue__storage_, number),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "optionsArray",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBOption),
         .number = GPBEnumValue_FieldNumber_OptionsArray,
         .hasIndex = GPBNoHasBit,
+        .offset = (uint32_t)offsetof(GPBEnumValue__storage_, optionsArray),
         .flags = GPBFieldRepeated,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBEnumValue__storage_, optionsArray),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBOption),
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -664,15 +619,9 @@
                                      rootClass:[GPBTypeRoot class]
                                           file:GPBTypeRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBEnumValue__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -702,25 +651,21 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "name",
+        .dataTypeSpecific.className = NULL,
         .number = GPBOption_FieldNumber_Name,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBOption__storage_, name),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBOption__storage_, name),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
       {
         .name = "value",
+        .dataTypeSpecific.className = GPBStringifySymbol(GPBAny),
         .number = GPBOption_FieldNumber_Value,
         .hasIndex = 1,
+        .offset = (uint32_t)offsetof(GPBOption__storage_, value),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeMessage,
-        .offset = offsetof(GPBOption__storage_, value),
-        .defaultValue.valueMessage = nil,
-        .dataTypeSpecific.className = GPBStringifySymbol(GPBAny),
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -728,15 +673,9 @@
                                      rootClass:[GPBTypeRoot class]
                                           file:GPBTypeRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBOption__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
diff --git a/objectivec/google/protobuf/Wrappers.pbobjc.h b/objectivec/google/protobuf/Wrappers.pbobjc.h
index 38b9962..0ca439a 100644
--- a/objectivec/google/protobuf/Wrappers.pbobjc.h
+++ b/objectivec/google/protobuf/Wrappers.pbobjc.h
@@ -3,7 +3,7 @@
 
 #import "GPBProtocolBuffers.h"
 
-#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30000
+#if GOOGLE_PROTOBUF_OBJC_GEN_VERSION != 30001
 #error This file was generated by a different version of protoc which is incompatible with your Protocol Buffer library sources.
 #endif
 
diff --git a/objectivec/google/protobuf/Wrappers.pbobjc.m b/objectivec/google/protobuf/Wrappers.pbobjc.m
index 0403b46..b1b5be6 100644
--- a/objectivec/google/protobuf/Wrappers.pbobjc.m
+++ b/objectivec/google/protobuf/Wrappers.pbobjc.m
@@ -44,14 +44,12 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "value",
+        .dataTypeSpecific.className = NULL,
         .number = GPBDoubleValue_FieldNumber_Value,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBDoubleValue__storage_, value),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeDouble,
-        .offset = offsetof(GPBDoubleValue__storage_, value),
-        .defaultValue.valueDouble = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -59,15 +57,9 @@
                                      rootClass:[GPBWrappersRoot class]
                                           file:GPBWrappersRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBDoubleValue__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -95,14 +87,12 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "value",
+        .dataTypeSpecific.className = NULL,
         .number = GPBFloatValue_FieldNumber_Value,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBFloatValue__storage_, value),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeFloat,
-        .offset = offsetof(GPBFloatValue__storage_, value),
-        .defaultValue.valueFloat = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -110,15 +100,9 @@
                                      rootClass:[GPBWrappersRoot class]
                                           file:GPBWrappersRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBFloatValue__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -146,14 +130,12 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "value",
+        .dataTypeSpecific.className = NULL,
         .number = GPBInt64Value_FieldNumber_Value,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBInt64Value__storage_, value),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeInt64,
-        .offset = offsetof(GPBInt64Value__storage_, value),
-        .defaultValue.valueInt64 = 0LL,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -161,15 +143,9 @@
                                      rootClass:[GPBWrappersRoot class]
                                           file:GPBWrappersRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBInt64Value__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -197,14 +173,12 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "value",
+        .dataTypeSpecific.className = NULL,
         .number = GPBUInt64Value_FieldNumber_Value,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBUInt64Value__storage_, value),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeUInt64,
-        .offset = offsetof(GPBUInt64Value__storage_, value),
-        .defaultValue.valueUInt64 = 0ULL,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -212,15 +186,9 @@
                                      rootClass:[GPBWrappersRoot class]
                                           file:GPBWrappersRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBUInt64Value__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -248,14 +216,12 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "value",
+        .dataTypeSpecific.className = NULL,
         .number = GPBInt32Value_FieldNumber_Value,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBInt32Value__storage_, value),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeInt32,
-        .offset = offsetof(GPBInt32Value__storage_, value),
-        .defaultValue.valueInt32 = 0,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -263,15 +229,9 @@
                                      rootClass:[GPBWrappersRoot class]
                                           file:GPBWrappersRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBInt32Value__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -299,14 +259,12 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "value",
+        .dataTypeSpecific.className = NULL,
         .number = GPBUInt32Value_FieldNumber_Value,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBUInt32Value__storage_, value),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeUInt32,
-        .offset = offsetof(GPBUInt32Value__storage_, value),
-        .defaultValue.valueUInt32 = 0U,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -314,15 +272,9 @@
                                      rootClass:[GPBWrappersRoot class]
                                           file:GPBWrappersRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBUInt32Value__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -339,7 +291,6 @@
 
 typedef struct GPBBoolValue__storage_ {
   uint32_t _has_storage_[1];
-  BOOL value;
 } GPBBoolValue__storage_;
 
 // This method is threadsafe because it is initially called
@@ -350,14 +301,12 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "value",
+        .dataTypeSpecific.className = NULL,
         .number = GPBBoolValue_FieldNumber_Value,
         .hasIndex = 0,
+        .offset = 1,  // Stored in _has_storage_ to save space.
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeBool,
-        .offset = offsetof(GPBBoolValue__storage_, value),
-        .defaultValue.valueBool = NO,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -365,15 +314,9 @@
                                      rootClass:[GPBWrappersRoot class]
                                           file:GPBWrappersRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBBoolValue__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -401,14 +344,12 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "value",
+        .dataTypeSpecific.className = NULL,
         .number = GPBStringValue_FieldNumber_Value,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBStringValue__storage_, value),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeString,
-        .offset = offsetof(GPBStringValue__storage_, value),
-        .defaultValue.valueString = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -416,15 +357,9 @@
                                      rootClass:[GPBWrappersRoot class]
                                           file:GPBWrappersRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBStringValue__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
@@ -452,14 +387,12 @@
     static GPBMessageFieldDescription fields[] = {
       {
         .name = "value",
+        .dataTypeSpecific.className = NULL,
         .number = GPBBytesValue_FieldNumber_Value,
         .hasIndex = 0,
+        .offset = (uint32_t)offsetof(GPBBytesValue__storage_, value),
         .flags = GPBFieldOptional,
         .dataType = GPBDataTypeBytes,
-        .offset = offsetof(GPBBytesValue__storage_, value),
-        .defaultValue.valueData = nil,
-        .dataTypeSpecific.className = NULL,
-        .fieldOptions = NULL,
       },
     };
     GPBDescriptor *localDescriptor =
@@ -467,15 +400,9 @@
                                      rootClass:[GPBWrappersRoot class]
                                           file:GPBWrappersRoot_FileDescriptor()
                                         fields:fields
-                                    fieldCount:sizeof(fields) / sizeof(GPBMessageFieldDescription)
-                                        oneofs:NULL
-                                    oneofCount:0
-                                         enums:NULL
-                                     enumCount:0
-                                        ranges:NULL
-                                    rangeCount:0
+                                    fieldCount:(uint32_t)(sizeof(fields) / sizeof(GPBMessageFieldDescription))
                                    storageSize:sizeof(GPBBytesValue__storage_)
-                                    wireFormat:NO];
+                                         flags:0];
     NSAssert(descriptor == nil, @"Startup recursed!");
     descriptor = localDescriptor;
   }
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_enum.cc b/src/google/protobuf/compiler/objectivec/objectivec_enum.cc
index 857d24a..3f81dcb 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_enum.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_enum.cc
@@ -122,16 +122,6 @@
       "\n",
       "name", name_);
 
-  printer->Print(
-      "GPBEnumDescriptor *$name$_EnumDescriptor(void) {\n"
-      "  static GPBEnumDescriptor *descriptor = NULL;\n"
-      "  if (!descriptor) {\n"
-      "    static GPBMessageEnumValueDescription values[] = {\n",
-      "name", name_);
-  printer->Indent();
-  printer->Indent();
-  printer->Indent();
-
   // Note: For the TextFormat decode info, we can't use the enum value as
   // the key because protocol buffer enums have 'allow_alias', which lets
   // a value be used more than once. Instead, the index into the list of
@@ -139,41 +129,66 @@
   // will be zero.
   TextFormatDecodeData text_format_decode_data;
   int enum_value_description_key = -1;
+  string text_blob;
 
   for (int i = 0; i < all_values_.size(); i++) {
     ++enum_value_description_key;
     string short_name(EnumValueShortName(all_values_[i]));
-    printer->Print("{ .name = \"$short_name$\", .number = $name$ },\n",
-                   "short_name", short_name,
-                   "name", EnumValueName(all_values_[i]));
+    text_blob += short_name + '\0';
     if (UnCamelCaseEnumShortName(short_name) != all_values_[i]->name()) {
       text_format_decode_data.AddString(enum_value_description_key, short_name,
                                         all_values_[i]->name());
     }
   }
-  printer->Outdent();
-  printer->Outdent();
-  printer->Outdent();
+
+  printer->Print(
+      "GPBEnumDescriptor *$name$_EnumDescriptor(void) {\n"
+      "  static GPBEnumDescriptor *descriptor = NULL;\n"
+      "  if (!descriptor) {\n",
+      "name", name_);
+
+  static const int kBytesPerLine = 40;  // allow for escaping
+  printer->Print(
+      "    static const char *valueNames =");
+  for (int i = 0; i < text_blob.size(); i += kBytesPerLine) {
+    printer->Print(
+        "\n        \"$data$\"",
+        "data", EscapeTrigraphs(CEscape(text_blob.substr(i, kBytesPerLine))));
+  }
+  printer->Print(
+      ";\n"
+      "    static const int32_t values[] = {\n");
+  for (int i = 0; i < all_values_.size(); i++) {
+    printer->Print("        $name$,\n",  "name", EnumValueName(all_values_[i]));
+  }
   printer->Print("    };\n");
+
   if (text_format_decode_data.num_entries() == 0) {
     printer->Print(
-        "    descriptor = [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol($name$)\n"
-        "                                                   values:values\n"
-        "                                               valueCount:sizeof(values) / sizeof(GPBMessageEnumValueDescription)\n"
-        "                                             enumVerifier:$name$_IsValidValue];\n",
+        "    GPBEnumDescriptor *worker =\n"
+        "        [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol($name$)\n"
+        "                                       valueNames:valueNames\n"
+        "                                           values:values\n"
+        "                                            count:(uint32_t)(sizeof(values) / sizeof(int32_t))\n"
+        "                                     enumVerifier:$name$_IsValidValue];\n",
         "name", name_);
     } else {
       printer->Print(
         "    static const char *extraTextFormatInfo = \"$extraTextFormatInfo$\";\n"
-        "    descriptor = [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol($name$)\n"
-        "                                                   values:values\n"
-        "                                               valueCount:sizeof(values) / sizeof(GPBMessageEnumValueDescription)\n"
-        "                                             enumVerifier:$name$_IsValidValue\n"
-        "                                      extraTextFormatInfo:extraTextFormatInfo];\n",
+        "    GPBEnumDescriptor *worker =\n"
+        "        [GPBEnumDescriptor allocDescriptorForName:GPBNSStringifySymbol($name$)\n"
+        "                                       valueNames:valueNames\n"
+        "                                           values:values\n"
+        "                                            count:(uint32_t)(sizeof(values) / sizeof(int32_t))\n"
+        "                                     enumVerifier:$name$_IsValidValue\n"
+        "                              extraTextFormatInfo:extraTextFormatInfo];\n",
         "name", name_,
         "extraTextFormatInfo", CEscape(text_format_decode_data.Data()));
     }
     printer->Print(
+      "    if (!OSAtomicCompareAndSwapPtrBarrier(nil, worker, (void * volatile *)&descriptor)) {\n"
+      "      [worker release];\n"
+      "    }\n"
       "  }\n"
       "  return descriptor;\n"
       "}\n\n");
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_enum_field.cc b/src/google/protobuf/compiler/objectivec/objectivec_enum_field.cc
index cfbb8c5..b63bc0d 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_enum_field.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_enum_field.cc
@@ -59,6 +59,9 @@
   (*variables)["enum_verifier"] = type + "_IsValidValue";
   (*variables)["enum_desc_func"] = type + "_EnumDescriptor";
 
+  (*variables)["dataTypeSpecific_name"] = "enumDescFunc";
+  (*variables)["dataTypeSpecific_value"] = (*variables)["enum_desc_func"];
+
   const Descriptor* msg_descriptor = descriptor->containing_type();
   (*variables)["owning_message_class"] = ClassName(msg_descriptor);
 }
@@ -72,13 +75,6 @@
 
 EnumFieldGenerator::~EnumFieldGenerator() {}
 
-void EnumFieldGenerator::GenerateFieldDescriptionTypeSpecific(
-    io::Printer* printer) const {
-  printer->Print(
-      variables_,
-      "  .dataTypeSpecific.enumDescFunc = $enum_desc_func$,\n");
-}
-
 void EnumFieldGenerator::GenerateCFunctionDeclarations(
     io::Printer* printer) const {
   if (!HasPreservingUnknownEnumSemantics(descriptor_->file())) {
@@ -145,13 +141,6 @@
       "// |" + variables_["name"] + "| contains |" + variables_["storage_type"] + "|\n";
 }
 
-void RepeatedEnumFieldGenerator::GenerateFieldDescriptionTypeSpecific(
-    io::Printer* printer) const {
-  printer->Print(
-      variables_,
-      "  .dataTypeSpecific.enumDescFunc = $enum_desc_func$,\n");
-}
-
 }  // namespace objectivec
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_enum_field.h b/src/google/protobuf/compiler/objectivec/objectivec_enum_field.h
index ae2f57e..946faa8 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_enum_field.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_enum_field.h
@@ -45,7 +45,6 @@
                                               const Options& options);
 
  public:
-  virtual void GenerateFieldDescriptionTypeSpecific(io::Printer* printer) const;
   virtual void GenerateCFunctionDeclarations(io::Printer* printer) const;
   virtual void GenerateCFunctionImplementations(io::Printer* printer) const;
   virtual void DetermineForwardDeclarations(set<string>* fwd_decls) const;
@@ -64,7 +63,6 @@
 
  public:
   virtual void FinishInitialization();
-  virtual void GenerateFieldDescriptionTypeSpecific(io::Printer* printer) const;
 
  protected:
   RepeatedEnumFieldGenerator(const FieldDescriptor* descriptor,
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_extension.cc b/src/google/protobuf/compiler/objectivec/objectivec_extension.cc
index 4e34839..3f7ab9d 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_extension.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_extension.cc
@@ -114,14 +114,14 @@
 
   printer->Print(vars,
                  "{\n"
-                 "  .singletonName = GPBStringifySymbol($root_class_and_method_name$),\n"
-                 "  .dataType = $extension_type$,\n"
-                 "  .extendedClass = GPBStringifySymbol($extended_type$),\n"
-                 "  .fieldNumber = $number$,\n"
                  "  .defaultValue.$default_name$ = $default$,\n"
+                 "  .singletonName = GPBStringifySymbol($root_class_and_method_name$),\n"
+                 "  .extendedClass = GPBStringifySymbol($extended_type$),\n"
                  "  .messageOrGroupClassName = $type$,\n"
-                 "  .options = $options$,\n"
                  "  .enumDescriptorFunc = $enum_desc_func_name$,\n"
+                 "  .fieldNumber = $number$,\n"
+                 "  .dataType = $extension_type$,\n"
+                 "  .options = $options$,\n"
                  "},\n");
 }
 
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_field.cc b/src/google/protobuf/compiler/objectivec/objectivec_field.cc
index 8697e22..7bb9837 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_field.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_field.cc
@@ -28,6 +28,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+#include <iostream>
+
 #include <google/protobuf/compiler/objectivec/objectivec_field.h>
 #include <google/protobuf/compiler/objectivec/objectivec_helpers.h>
 #include <google/protobuf/compiler/objectivec/objectivec_enum_field.h>
@@ -75,7 +77,6 @@
   (*variables)["field_number_name"] =
       classname + "_FieldNumber_" + capitalized_name;
   (*variables)["field_number"] = SimpleItoa(descriptor->number());
-  (*variables)["has_index"] = SimpleItoa(descriptor->index());
   (*variables)["field_type"] = GetCapitalizedType(descriptor);
   std::vector<string> field_flags;
   if (descriptor->is_repeated()) field_flags.push_back("GPBFieldRepeated");
@@ -99,18 +100,9 @@
   (*variables)["dataTypeSpecific_name"] = "className";
   (*variables)["dataTypeSpecific_value"] = "NULL";
 
-  string field_options = descriptor->options().SerializeAsString();
-  // Must convert to a standard byte order for packing length into
-  // a cstring.
-  uint32 length = ghtonl(field_options.length());
-  if (length > 0) {
-    string bytes((const char*)&length, sizeof(length));
-    bytes.append(field_options);
-    string options_str = "\"" + CEscape(bytes) + "\"";
-    (*variables)["fieldoptions"] = "\"" + CEscape(bytes) + "\"";
-  } else {
-    (*variables)["fieldoptions"] = "";
-  }
+  (*variables)["storage_offset_value"] =
+      "(uint32_t)offsetof(" + classname + "__storage_, " + camel_case_name + ")";
+  (*variables)["storage_offset_comment"] = "";
 
   // Clear some common things so they can be set just when needed.
   (*variables)["storage_attribute"] = "";
@@ -190,52 +182,54 @@
 }
 
 void FieldGenerator::GenerateFieldDescription(
-    io::Printer* printer) const {
-  printer->Print(
-      variables_,
-      "{\n"
-      "  .name = \"$name$\",\n"
-      "  .number = $field_number_name$,\n"
-      "  .hasIndex = $has_index$,\n"
-      "  .flags = $fieldflags$,\n"
-      "  .dataType = GPBDataType$field_type$,\n"
-      "  .offset = offsetof($classname$__storage_, $name$),\n"
-      "  .defaultValue.$default_name$ = $default$,\n");
-
-  // TODO(thomasvl): It might be useful to add a CPP wrapper to support
-  // compiling away the EnumDescriptors.  To do that, we'd need a #if here
-  // to control setting the descriptor vs. the validator, and above in
-  // SetCommonFieldVariables() we'd want to wrap how we add
-  // GPBFieldHasDefaultValue to the flags.
-
-  // "  .dataTypeSpecific.value* = [something],"
-  GenerateFieldDescriptionTypeSpecific(printer);
-
-  const string& field_options(variables_.find("fieldoptions")->second);
-  if (field_options.empty()) {
-    printer->Print("  .fieldOptions = NULL,\n");
-  } else {
-    // Can't use PrintRaw() here to get the #if/#else/#endif lines completely
-    // outdented because the need for indent captured on the previous
-    // printing of a \n and there is no way to get the current indent level
-    // to call the right number of Outdent()/Indents() to maintain state.
+    io::Printer* printer, bool include_default) const {
+  // Printed in the same order as the structure decl.
+  if (include_default) {
     printer->Print(
         variables_,
-        "#if GPBOBJC_INCLUDE_FIELD_OPTIONS\n"
-        "  .fieldOptions = $fieldoptions$,\n"
-        "#else\n"
-        "  .fieldOptions = NULL,\n"
-        "#endif  // GPBOBJC_INCLUDE_FIELD_OPTIONS\n");
+        "{\n"
+        "  .defaultValue.$default_name$ = $default$,\n"
+        "  .core.name = \"$name$\",\n"
+        "  .core.dataTypeSpecific.$dataTypeSpecific_name$ = $dataTypeSpecific_value$,\n"
+        "  .core.number = $field_number_name$,\n"
+        "  .core.hasIndex = $has_index$,\n"
+        "  .core.offset = $storage_offset_value$,$storage_offset_comment$\n"
+        "  .core.flags = $fieldflags$,\n"
+        "  .core.dataType = GPBDataType$field_type$,\n"
+        "},\n");
+  } else {
+    printer->Print(
+        variables_,
+        "{\n"
+        "  .name = \"$name$\",\n"
+        "  .dataTypeSpecific.$dataTypeSpecific_name$ = $dataTypeSpecific_value$,\n"
+        "  .number = $field_number_name$,\n"
+        "  .hasIndex = $has_index$,\n"
+        "  .offset = $storage_offset_value$,$storage_offset_comment$\n"
+        "  .flags = $fieldflags$,\n"
+        "  .dataType = GPBDataType$field_type$,\n"
+        "},\n");
   }
-
-  printer->Print("},\n");
 }
 
-void FieldGenerator::GenerateFieldDescriptionTypeSpecific(
-    io::Printer* printer) const {
-  printer->Print(
-      variables_,
-      "  .dataTypeSpecific.$dataTypeSpecific_name$ = $dataTypeSpecific_value$,\n");
+void FieldGenerator::SetRuntimeHasBit(int has_index) {
+  variables_["has_index"] = SimpleItoa(has_index);
+}
+
+void FieldGenerator::SetNoHasBit(void) {
+  variables_["has_index"] = "GPBNoHasBit";
+}
+
+int FieldGenerator::ExtraRuntimeHasBitsNeeded(void) const {
+  return 0;
+}
+
+void FieldGenerator::SetExtraRuntimeHasBitsBase(int index_base) {
+  // NOTE: src/google/protobuf/compiler/plugin.cc makes use of cerr for some
+  // error cases, so it seems to be ok to use as a back door for errors.
+  cerr << "Error: should have overriden SetExtraRuntimeHasBitsBase()." << endl;
+  cerr.flush();
+  abort();
 }
 
 void FieldGenerator::SetOneofIndexBase(int index_base) {
@@ -302,6 +296,14 @@
   return false;
 }
 
+bool SingleFieldGenerator::RuntimeUsesHasBit(void) const {
+  if (descriptor_->containing_oneof() != NULL) {
+    // The oneof tracks what is set instead.
+    return false;
+  }
+  return true;
+}
+
 ObjCObjFieldGenerator::ObjCObjFieldGenerator(const FieldDescriptor* descriptor,
                                              const Options& options)
     : SingleFieldGenerator(descriptor, options) {
@@ -347,8 +349,6 @@
 RepeatedFieldGenerator::RepeatedFieldGenerator(
     const FieldDescriptor* descriptor, const Options& options)
     : ObjCObjFieldGenerator(descriptor, options) {
-  // Repeated fields don't use the has index.
-  variables_["has_index"] = "GPBNoHasBit";
   // Default to no comment and let the cases needing it fill it in.
   variables_["array_comment"] = "";
 }
@@ -402,6 +402,10 @@
   return false;
 }
 
+bool RepeatedFieldGenerator::RuntimeUsesHasBit(void) const {
+  return false;  // The array having anything is what is used.
+}
+
 FieldGeneratorMap::FieldGeneratorMap(const Descriptor* descriptor,
                                      const Options& options)
     : descriptor_(descriptor),
@@ -432,12 +436,40 @@
   return *extension_generators_[index];
 }
 
+int FieldGeneratorMap::CalculateHasBits(void) {
+  int total_bits = 0;
+  for (int i = 0; i < descriptor_->field_count(); i++) {
+    if (field_generators_[i]->RuntimeUsesHasBit()) {
+      field_generators_[i]->SetRuntimeHasBit(total_bits);
+      ++total_bits;
+    } else {
+      field_generators_[i]->SetNoHasBit();
+    }
+    int extra_bits = field_generators_[i]->ExtraRuntimeHasBitsNeeded();
+    if (extra_bits) {
+      field_generators_[i]->SetExtraRuntimeHasBitsBase(total_bits);
+      total_bits += extra_bits;
+    }
+  }
+  return total_bits;
+}
+
 void FieldGeneratorMap::SetOneofIndexBase(int index_base) {
   for (int i = 0; i < descriptor_->field_count(); i++) {
     field_generators_[i]->SetOneofIndexBase(index_base);
   }
 }
 
+bool FieldGeneratorMap::DoesAnyFieldHaveNonZeroDefault(void) const {
+  for (int i = 0; i < descriptor_->field_count(); i++) {
+    if (HasNonZeroDefaultValue(descriptor_->field(i))) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
 }  // namespace objectivec
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_field.h b/src/google/protobuf/compiler/objectivec/objectivec_field.h
index e8a20a7..a3a4b1b 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_field.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_field.h
@@ -61,7 +61,6 @@
 
   // Called by GenerateFieldDescription, exposed for classes that need custom
   // generation.
-  virtual void GenerateFieldDescriptionTypeSpecific(io::Printer* printer) const;
 
   // Exposed for subclasses to extend, base does nothing.
   virtual void GenerateCFunctionDeclarations(io::Printer* printer) const;
@@ -71,9 +70,16 @@
   virtual void DetermineForwardDeclarations(set<string>* fwd_decls) const;
 
   // Used during generation, not intended to be extended by subclasses.
-  void GenerateFieldDescription(io::Printer* printer) const;
+  void GenerateFieldDescription(
+      io::Printer* printer, bool include_default) const;
   void GenerateFieldNumberConstant(io::Printer* printer) const;
 
+  // Exposed to get and set the has bits information.
+  virtual bool RuntimeUsesHasBit(void) const = 0;
+  void SetRuntimeHasBit(int has_index);
+  void SetNoHasBit(void);
+  virtual int ExtraRuntimeHasBitsNeeded(void) const;
+  virtual void SetExtraRuntimeHasBitsBase(int index_base);
   void SetOneofIndexBase(int index_base);
 
   string variable(const char* key) const {
@@ -109,6 +115,8 @@
 
   virtual void GeneratePropertyImplementation(io::Printer* printer) const;
 
+  virtual bool RuntimeUsesHasBit(void) const;
+
  protected:
   SingleFieldGenerator(const FieldDescriptor* descriptor,
                        const Options& options);
@@ -143,6 +151,8 @@
 
   virtual void GeneratePropertyImplementation(io::Printer* printer) const;
 
+  virtual bool RuntimeUsesHasBit(void) const;
+
  protected:
   RepeatedFieldGenerator(const FieldDescriptor* descriptor,
                          const Options& options);
@@ -162,8 +172,14 @@
   const FieldGenerator& get(const FieldDescriptor* field) const;
   const FieldGenerator& get_extension(int index) const;
 
+  // Assigns the has bits and returns the number of bits needed.
+  int CalculateHasBits(void);
+
   void SetOneofIndexBase(int index_base);
 
+  // Check if any field of this message has a non zero default.
+  bool DoesAnyFieldHaveNonZeroDefault(void) const;
+
  private:
   const Descriptor* descriptor_;
   scoped_array<scoped_ptr<FieldGenerator> > field_generators_;
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_file.cc b/src/google/protobuf/compiler/objectivec/objectivec_file.cc
index 1619988..c58e753 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_file.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_file.cc
@@ -45,7 +45,7 @@
 // This is also found in GPBBootstrap.h, and needs to be kept in sync.  It
 // is the version check done to ensure generated code works with the current
 // runtime being used.
-const int32 GOOGLE_PROTOBUF_OBJC_GEN_VERSION = 30000;
+const int32 GOOGLE_PROTOBUF_OBJC_GEN_VERSION = 30001;
 
 namespace compiler {
 namespace objectivec {
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_helpers.cc b/src/google/protobuf/compiler/objectivec/objectivec_helpers.cc
index b912ea6..fda5180 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_helpers.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_helpers.cc
@@ -220,11 +220,6 @@
   }
 }
 
-// Escape C++ trigraphs by escaping question marks to \?
-string EscapeTrigraphs(const string& to_escape) {
-  return StringReplace(to_escape, "?", "\\?", true);
-}
-
 void PathSplit(const string& path, string* directory, string* basename) {
   string::size_type last_slash = path.rfind('/');
   if (last_slash == string::npos) {
@@ -264,6 +259,11 @@
 
 }  // namespace
 
+// Escape C++ trigraphs by escaping question marks to \?
+string EscapeTrigraphs(const string& to_escape) {
+  return StringReplace(to_escape, "?", "\\?", true);
+}
+
 string StripProto(const string& filename) {
   if (HasSuffixString(filename, ".protodevel")) {
     return StripSuffixString(filename, ".protodevel");
@@ -734,7 +734,7 @@
         uint32 length = ghtonl(default_string.length());
         string bytes((const char*)&length, sizeof(length));
         bytes.append(default_string);
-        return "(NSData*)\"" + CEscape(bytes) + "\"";
+        return "(NSData*)\"" + EscapeTrigraphs(CEscape(bytes)) + "\"";
       } else {
         return "@\"" + EscapeTrigraphs(CEscape(default_string)) + "\"";
       }
@@ -751,6 +751,50 @@
   return NULL;
 }
 
+bool HasNonZeroDefaultValue(const FieldDescriptor* field) {
+  // Repeated fields don't have defaults.
+  if (field->is_repeated()) {
+    return false;
+  }
+
+  if (!field->has_default_value()) {
+    // No custom default set in the proto file.
+    return false;
+  }
+
+  // Some proto file set the default to the zero value, so make sure the value
+  // isn't the zero case.
+  switch (field->cpp_type()) {
+    case FieldDescriptor::CPPTYPE_INT32:
+      return field->default_value_int32() != 0;
+    case FieldDescriptor::CPPTYPE_UINT32:
+      return field->default_value_uint32() != 0U;
+    case FieldDescriptor::CPPTYPE_INT64:
+      return field->default_value_int64() != 0LL;
+    case FieldDescriptor::CPPTYPE_UINT64:
+      return field->default_value_uint64() != 0ULL;
+    case FieldDescriptor::CPPTYPE_DOUBLE:
+      return field->default_value_double() != 0.0;
+    case FieldDescriptor::CPPTYPE_FLOAT:
+      return field->default_value_float() != 0.0f;
+    case FieldDescriptor::CPPTYPE_BOOL:
+      return field->default_value_bool();
+    case FieldDescriptor::CPPTYPE_STRING: {
+      const string& default_string = field->default_value_string();
+      return default_string.length() != 0;
+    }
+    case FieldDescriptor::CPPTYPE_ENUM:
+      return field->default_value_enum()->number() != 0;
+    case FieldDescriptor::CPPTYPE_MESSAGE:
+      return false;
+  }
+
+  // Some compilers report reaching end of function even though all cases of
+  // the enum are handed in the switch.
+  GOOGLE_LOG(FATAL) << "Can't get here.";
+  return false;
+}
+
 string BuildFlagsString(const vector<string>& strings) {
   if (strings.size() == 0) {
     return "0";
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_helpers.h b/src/google/protobuf/compiler/objectivec/objectivec_helpers.h
index a301493..0db9de9 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_helpers.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_helpers.h
@@ -48,6 +48,9 @@
   string expected_prefixes_path;
 };
 
+// Escape C++ trigraphs by escaping question marks to "\?".
+string EscapeTrigraphs(const string& to_escape);
+
 // Strips ".proto" or ".protodevel" from the end of a filename.
 string StripProto(const string& filename);
 
@@ -143,6 +146,7 @@
 
 string GPBGenericValueFieldName(const FieldDescriptor* field);
 string DefaultValue(const FieldDescriptor* field);
+bool HasNonZeroDefaultValue(const FieldDescriptor* field);
 
 string BuildFlagsString(const vector<string>& strings);
 
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_map_field.cc b/src/google/protobuf/compiler/objectivec/objectivec_map_field.cc
index 2751e93..ac5d8ae 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_map_field.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_map_field.cc
@@ -140,13 +140,18 @@
           value_field_generator_->variable("storage_type") + "*>";
     }
   }
+
+  variables_["dataTypeSpecific_name"] =
+      value_field_generator_->variable("dataTypeSpecific_name");
+  variables_["dataTypeSpecific_value"] =
+      value_field_generator_->variable("dataTypeSpecific_value");
 }
 
 MapFieldGenerator::~MapFieldGenerator() {}
 
 void MapFieldGenerator::FinishInitialization(void) {
   RepeatedFieldGenerator::FinishInitialization();
-  // Use the array_comment suport in RepeatedFieldGenerator to output what the
+  // Use the array_comment support in RepeatedFieldGenerator to output what the
   // values in the map are.
   const FieldDescriptor* value_descriptor =
       descriptor_->message_type()->FindFieldByName("value");
@@ -156,13 +161,6 @@
   }
 }
 
-void MapFieldGenerator::GenerateFieldDescriptionTypeSpecific(
-    io::Printer* printer) const {
-  // Relay it to the value generator to provide enum validator, message
-  // class, etc.
-  value_field_generator_->GenerateFieldDescriptionTypeSpecific(printer);
-}
-
 void MapFieldGenerator::DetermineForwardDeclarations(
     set<string>* fwd_decls) const {
   RepeatedFieldGenerator::DetermineForwardDeclarations(fwd_decls);
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_map_field.h b/src/google/protobuf/compiler/objectivec/objectivec_map_field.h
index 7351ea0..bc68a68 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_map_field.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_map_field.h
@@ -46,7 +46,6 @@
 
  public:
   virtual void FinishInitialization(void);
-  virtual void GenerateFieldDescriptionTypeSpecific(io::Printer* printer) const;
 
  protected:
   MapFieldGenerator(const FieldDescriptor* descriptor, const Options& options);
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_message.cc b/src/google/protobuf/compiler/objectivec/objectivec_message.cc
index e0ea8bd..3ebeead 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_message.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_message.cc
@@ -66,11 +66,12 @@
   // The first item in the object structure is our uint32[] for has bits.
   // We then want to order things to make the instances as small as
   // possible. So we follow the has bits with:
-  //   1. Bools (1 byte)
-  //   2. Anything always 4 bytes - float, *32, enums
-  //   3. Anything that is always a pointer (they will be 8 bytes on 64 bit
+  //   1. Anything always 4 bytes - float, *32, enums
+  //   2. Anything that is always a pointer (they will be 8 bytes on 64 bit
   //      builds and 4 bytes on 32bit builds.
-  //   4. Anything always 8 bytes - double, *64
+  //   3. Anything always 8 bytes - double, *64
+  //
+  // NOTE: Bools aren't listed, they were stored in the has bits.
   //
   // Why? Using 64bit builds as an example, this means worse case, we have
   // enough bools that we overflow 1 byte from 4 byte alignment, so 3 bytes
@@ -115,9 +116,9 @@
     case FieldDescriptor::TYPE_ENUM:
       return 2;
 
-    // 1 byte.
+    // 0 bytes. Stored in the has bits.
     case FieldDescriptor::TYPE_BOOL:
-      return 1;
+      return 99;  // End of the list (doesn't really matter).
   }
 
   // Some compilers report reaching end of function even though all cases of
@@ -404,32 +405,28 @@
     sort(sorted_extensions.begin(), sorted_extensions.end(),
          ExtensionRangeOrdering());
 
-    // TODO(thomasvl): Finish optimizing has bit. The current behavior is as
-    // follows:
-    // 1. objectivec_field.cc's SetCommonFieldVariables() defaults the has_index
-    //    to the field's index in the list of fields.
-    // 2. RepeatedFieldGenerator::RepeatedFieldGenerator() sets has_index to
-    //    GPBNoHasBit because repeated fields & map<> fields don't use the has
-    //    bit.
-    // 3. FieldGenerator::SetOneofIndexBase() overrides has_bit with a negative
-    //    index that groups all the elements on of the oneof.
-    // So in has_storage, we need enough bits for the single fields that aren't
-    // in any oneof, and then one int32 for each oneof (to store the field
-    // number).  So we could save a little space by not using the field's index
-    // and instead make a second pass only assigning indexes for the fields
-    // that would need it.  The only savings would come when messages have over
-    // a multiple of 32 fields with some number being repeated or in oneofs to
-    // drop the count below that 32 multiple; so it hasn't seemed worth doing
-    // at the moment.
-    size_t num_has_bits = descriptor_->field_count();
+    // Assign has bits:
+    // 1. FieldGeneratorMap::CalculateHasBits() loops through the fields seeing
+    //    who needs has bits and assigning them.
+    // 2. FieldGenerator::SetOneofIndexBase() overrides has_bit with a negative
+    //    index that groups all the elements in the oneof.
+    size_t num_has_bits = field_generators_.CalculateHasBits();
     size_t sizeof_has_storage = (num_has_bits + 31) / 32;
+    if (sizeof_has_storage == 0) {
+      // In the case where no field needs has bits, don't let the _has_storage_
+      // end up as zero length (zero length arrays are sort of a grey area
+      // since it has to be at the start of the struct). This also ensures a
+      // field with only oneofs keeps the required negative indices they need.
+      sizeof_has_storage = 1;
+    }
     // Tell all the fields the oneof base.
     for (vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
          iter != oneof_generators_.end(); ++iter) {
       (*iter)->SetOneofIndexBase(sizeof_has_storage);
     }
     field_generators_.SetOneofIndexBase(sizeof_has_storage);
-    // Add an int32 for each oneof to store which is set.
+    // sizeof_has_storage needs enough bits for the single fields that aren't in
+    // any oneof, and then one int32 for each oneof (to store the field number).
     sizeof_has_storage += descriptor_->oneof_decl_count();
 
     printer->Print(
@@ -456,47 +453,26 @@
         "  static GPBDescriptor *descriptor = nil;\n"
         "  if (!descriptor) {\n");
 
-    bool has_oneofs = oneof_generators_.size();
-    if (has_oneofs) {
-      printer->Print(
-          "    static GPBMessageOneofDescription oneofs[] = {\n");
-      printer->Indent();
-      printer->Indent();
-      printer->Indent();
-      for (vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
-           iter != oneof_generators_.end(); ++iter) {
-        (*iter)->GenerateDescription(printer);
-      }
-      printer->Outdent();
-      printer->Outdent();
-      printer->Outdent();
-      printer->Print(
-          "    };\n");
-    }
-
     TextFormatDecodeData text_format_decode_data;
     bool has_fields = descriptor_->field_count() > 0;
+    bool need_defaults = field_generators_.DoesAnyFieldHaveNonZeroDefault();
+    string field_description_type;
+    if (need_defaults) {
+      field_description_type = "GPBMessageFieldDescriptionWithDefault";
+    } else {
+      field_description_type = "GPBMessageFieldDescription";
+    }
     if (has_fields) {
-      // TODO(thomasvl): The plugin's FieldGenerator::GenerateFieldDescription()
-      // wraps the fieldOptions's value of this structure in an CPP gate so
-      // they can be compiled away; but that still results in a const char* in
-      // the structure for a NULL pointer for every message field.  If the
-      // fieldOptions are moved to a separate payload like the TextFormat extra
-      // data is, then it would shrink that static data shrinking the binaries
-      // a little more.
-      // TODO(thomasvl): proto3 syntax doens't need a defaultValue in the
-      // structure because primitive types are always zero.  If we add a second
-      // structure and a different initializer, we can avoid the wasted static
-      // storage for every field in a proto3 message.
       printer->Print(
-          "    static GPBMessageFieldDescription fields[] = {\n");
+          "    static $field_description_type$ fields[] = {\n",
+          "field_description_type", field_description_type);
       printer->Indent();
       printer->Indent();
       printer->Indent();
       for (int i = 0; i < descriptor_->field_count(); ++i) {
         const FieldGenerator& field_generator =
             field_generators_.get(sorted_fields[i]);
-        field_generator.GenerateFieldDescription(printer);
+        field_generator.GenerateFieldDescription(printer, need_defaults);
         if (field_generator.needs_textformat_name_support()) {
           text_format_decode_data.AddString(sorted_fields[i]->number(),
                                             field_generator.generated_objc_name(),
@@ -510,111 +486,89 @@
           "    };\n");
     }
 
-    bool has_enums = enum_generators_.size();
-    if (has_enums) {
-      printer->Print(
-          "    static GPBMessageEnumDescription enums[] = {\n");
-      printer->Indent();
-      printer->Indent();
-      printer->Indent();
-      for (vector<EnumGenerator*>::iterator iter = enum_generators_.begin();
-           iter != enum_generators_.end(); ++iter) {
-        printer->Print("{ .enumDescriptorFunc = $name$_EnumDescriptor },\n",
-                       "name", (*iter)->name());
-      }
-      printer->Outdent();
-      printer->Outdent();
-      printer->Outdent();
-      printer->Print(
-          "    };\n");
-    }
-
-    bool has_extensions = sorted_extensions.size();
-    if (has_extensions) {
-      printer->Print(
-          "    static GPBExtensionRange ranges[] = {\n");
-      printer->Indent();
-      printer->Indent();
-      printer->Indent();
-      for (int i = 0; i < sorted_extensions.size(); i++) {
-        printer->Print("{ .start = $start$, .end = $end$ },\n",
-                       "start", SimpleItoa(sorted_extensions[i]->start),
-                       "end", SimpleItoa(sorted_extensions[i]->end));
-      }
-      printer->Outdent();
-      printer->Outdent();
-      printer->Outdent();
-      printer->Print(
-          "    };\n");
-    }
-
     map<string, string> vars;
     vars["classname"] = class_name_;
     vars["rootclassname"] = root_classname_;
     vars["fields"] = has_fields ? "fields" : "NULL";
-    vars["fields_count"] =
-        has_fields ? "sizeof(fields) / sizeof(GPBMessageFieldDescription)" : "0";
-    vars["oneofs"] = has_oneofs ? "oneofs" : "NULL";
-    vars["oneof_count"] =
-        has_oneofs ? "sizeof(oneofs) / sizeof(GPBMessageOneofDescription)" : "0";
-    vars["enums"] = has_enums ? "enums" : "NULL";
-    vars["enum_count"] =
-        has_enums ? "sizeof(enums) / sizeof(GPBMessageEnumDescription)" : "0";
-    vars["ranges"] = has_extensions ? "ranges" : "NULL";
-    vars["range_count"] =
-        has_extensions ? "sizeof(ranges) / sizeof(GPBExtensionRange)" : "0";
-    vars["wireformat"] =
-        descriptor_->options().message_set_wire_format() ? "YES" : "NO";
-
-    if (text_format_decode_data.num_entries() == 0) {
-      printer->Print(
-          vars,
-          "    GPBDescriptor *localDescriptor =\n"
-          "        [GPBDescriptor allocDescriptorForClass:[$classname$ class]\n"
-          "                                     rootClass:[$rootclassname$ class]\n"
-          "                                          file:$rootclassname$_FileDescriptor()\n"
-          "                                        fields:$fields$\n"
-          "                                    fieldCount:$fields_count$\n"
-          "                                        oneofs:$oneofs$\n"
-          "                                    oneofCount:$oneof_count$\n"
-          "                                         enums:$enums$\n"
-          "                                     enumCount:$enum_count$\n"
-          "                                        ranges:$ranges$\n"
-          "                                    rangeCount:$range_count$\n"
-          "                                   storageSize:sizeof($classname$__storage_)\n"
-          "                                    wireFormat:$wireformat$];\n");
+    if (has_fields) {
+      vars["fields_count"] =
+          "(uint32_t)(sizeof(fields) / sizeof(" + field_description_type + "))";
     } else {
-      vars["extraTextFormatInfo"] = CEscape(text_format_decode_data.Data());
+      vars["fields_count"] = "0";
+    }
+
+    std::vector<string> init_flags;
+    if (need_defaults) {
+      init_flags.push_back("GPBDescriptorInitializationFlag_FieldsWithDefault");
+    }
+    if (descriptor_->options().message_set_wire_format()) {
+      init_flags.push_back("GPBDescriptorInitializationFlag_WireFormat");
+    }
+    vars["init_flags"] = BuildFlagsString(init_flags);
+
+    printer->Print(
+        vars,
+        "    GPBDescriptor *localDescriptor =\n"
+        "        [GPBDescriptor allocDescriptorForClass:[$classname$ class]\n"
+        "                                     rootClass:[$rootclassname$ class]\n"
+        "                                          file:$rootclassname$_FileDescriptor()\n"
+        "                                        fields:$fields$\n"
+        "                                    fieldCount:$fields_count$\n"
+        "                                   storageSize:sizeof($classname$__storage_)\n"
+        "                                         flags:$init_flags$];\n");
+    if (oneof_generators_.size() != 0) {
       printer->Print(
-          vars,
-          "#if GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS\n"
-          "    const char *extraTextFormatInfo = NULL;\n"
-          "#else\n"
-          "    static const char *extraTextFormatInfo = \"$extraTextFormatInfo$\";\n"
-          "#endif  // GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS\n"
-          "    GPBDescriptor *localDescriptor =\n"
-          "        [GPBDescriptor allocDescriptorForClass:[$classname$ class]\n"
-          "                                     rootClass:[$rootclassname$ class]\n"
-          "                                          file:$rootclassname$_FileDescriptor()\n"
-          "                                        fields:$fields$\n"
-          "                                    fieldCount:$fields_count$\n"
-          "                                        oneofs:$oneofs$\n"
-          "                                    oneofCount:$oneof_count$\n"
-          "                                         enums:$enums$\n"
-          "                                     enumCount:$enum_count$\n"
-          "                                        ranges:$ranges$\n"
-          "                                    rangeCount:$range_count$\n"
-          "                                   storageSize:sizeof($classname$__storage_)\n"
-          "                                    wireFormat:$wireformat$\n"
-          "                           extraTextFormatInfo:extraTextFormatInfo];\n");
+          "    static const char *oneofs[] = {\n");
+      for (vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
+           iter != oneof_generators_.end(); ++iter) {
+        printer->Print(
+            "      \"$name$\",\n",
+            "name", (*iter)->DescriptorName());
       }
       printer->Print(
-          "    NSAssert(descriptor == nil, @\"Startup recursed!\");\n"
-          "    descriptor = localDescriptor;\n"
-          "  }\n"
-          "  return descriptor;\n"
-          "}\n\n"
-          "@end\n\n");
+          "    };\n"
+          "    [localDescriptor setupOneofs:oneofs\n"
+          "                           count:(uint32_t)(sizeof(oneofs) / sizeof(char*))\n"
+          "                   firstHasIndex:$first_has_index$];\n",
+          "first_has_index", oneof_generators_[0]->HasIndexAsString());
+    }
+    if (text_format_decode_data.num_entries() != 0) {
+      const string text_format_data_str(text_format_decode_data.Data());
+      printer->Print(
+          "#if !GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS\n"
+          "    static const char *extraTextFormatInfo =");
+      static const int kBytesPerLine = 40;  // allow for escaping
+      for (int i = 0; i < text_format_data_str.size(); i += kBytesPerLine) {
+        printer->Print(
+            "\n        \"$data$\"",
+            "data", EscapeTrigraphs(
+                CEscape(text_format_data_str.substr(i, kBytesPerLine))));
+      }
+      printer->Print(
+          ";\n"
+          "    [localDescriptor setupExtraTextInfo:extraTextFormatInfo];\n"
+          "#endif  // !GPBOBJC_SKIP_MESSAGE_TEXTFORMAT_EXTRAS\n");
+    }
+    if (sorted_extensions.size() != 0) {
+      printer->Print(
+          "    static const GPBExtensionRange ranges[] = {\n");
+      for (int i = 0; i < sorted_extensions.size(); i++) {
+        printer->Print("      { .start = $start$, .end = $end$ },\n",
+                       "start", SimpleItoa(sorted_extensions[i]->start),
+                       "end", SimpleItoa(sorted_extensions[i]->end));
+      }
+      printer->Print(
+          "    };\n"
+          "    [localDescriptor setupExtensionRanges:ranges\n"
+          "                                    count:(uint32_t)(sizeof(ranges) / sizeof(GPBExtensionRange))];\n");
+    }
+    printer->Print(
+        "    NSAssert(descriptor == nil, @\"Startup recursed!\");\n"
+        "    descriptor = localDescriptor;\n"
+        "  }\n"
+        "  return descriptor;\n"
+        "}\n\n"
+        "@end\n\n");
 
     for (int i = 0; i < descriptor_->field_count(); i++) {
       field_generators_.get(descriptor_->field(i))
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_oneof.cc b/src/google/protobuf/compiler/objectivec/objectivec_oneof.cc
index 24e6df0..44bafd7 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_oneof.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_oneof.cc
@@ -120,17 +120,16 @@
       "void $owning_message_class$_Clear$capitalized_name$OneOfCase($owning_message_class$ *message) {\n"
       "  GPBDescriptor *descriptor = [message descriptor];\n"
       "  GPBOneofDescriptor *oneof = descriptor->oneofs_[$raw_index$];\n"
-      "  GPBMaybeClearOneof(message, oneof, 0);\n"
+      "  GPBMaybeClearOneof(message, oneof, $index$, 0);\n"
       "}\n");
 }
 
-void OneofGenerator::GenerateDescription(io::Printer* printer) {
-  printer->Print(
-      variables_,
-      "{\n"
-      "  .name = \"$name$\",\n"
-      "  .index = $index$,\n"
-      "},\n");
+string OneofGenerator::DescriptorName(void) const {
+  return variables_.find("name")->second;
+}
+
+string OneofGenerator::HasIndexAsString(void) const {
+  return variables_.find("index")->second;
 }
 
 }  // namespace objectivec
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_oneof.h b/src/google/protobuf/compiler/objectivec/objectivec_oneof.h
index bcba82d..3d9df4d 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_oneof.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_oneof.h
@@ -61,7 +61,9 @@
 
   void GeneratePropertyImplementation(io::Printer* printer);
   void GenerateClearFunctionImplementation(io::Printer* printer);
-  void GenerateDescription(io::Printer* printer);
+
+  string DescriptorName(void) const;
+  string HasIndexAsString(void) const;
 
  private:
   const OneofDescriptor* descriptor_;
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.cc b/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.cc
index ea7f1b9..d49350f 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.cc
@@ -134,6 +134,32 @@
 
 PrimitiveFieldGenerator::~PrimitiveFieldGenerator() {}
 
+void PrimitiveFieldGenerator::GenerateFieldStorageDeclaration(
+    io::Printer* printer) const {
+  if (GetObjectiveCType(descriptor_) == OBJECTIVECTYPE_BOOLEAN) {
+    // Nothing, BOOLs are stored in the has bits.
+  } else {
+    SingleFieldGenerator::GenerateFieldStorageDeclaration(printer);
+  }
+}
+
+int PrimitiveFieldGenerator::ExtraRuntimeHasBitsNeeded(void) const {
+  if (GetObjectiveCType(descriptor_) == OBJECTIVECTYPE_BOOLEAN) {
+    // Reserve a bit for the storage of the boolean.
+    return 1;
+  }
+  return 0;
+}
+
+void PrimitiveFieldGenerator::SetExtraRuntimeHasBitsBase(int has_base) {
+  if (GetObjectiveCType(descriptor_) == OBJECTIVECTYPE_BOOLEAN) {
+    // Set into the offset the has bit to use for the actual value.
+    variables_["storage_offset_value"] = SimpleItoa(has_base);
+    variables_["storage_offset_comment"] =
+        "  // Stored in _has_storage_ to save space.";
+  }
+}
+
 PrimitiveObjFieldGenerator::PrimitiveObjFieldGenerator(
     const FieldDescriptor* descriptor, const Options& options)
     : ObjCObjFieldGenerator(descriptor, options) {
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.h b/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.h
index 87139af..69bb1fd 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.h
@@ -49,6 +49,11 @@
                           const Options& options);
   virtual ~PrimitiveFieldGenerator();
 
+  virtual void GenerateFieldStorageDeclaration(io::Printer* printer) const;
+
+  virtual int ExtraRuntimeHasBitsNeeded(void) const;
+  virtual void SetExtraRuntimeHasBitsBase(int index_base);
+
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(PrimitiveFieldGenerator);
 };