Protocol Buffers v29.0

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Bazel

• Add missing line to docstring after Args (#19213) (6f310d5)
• Fix proto_info_bzl (#18918) (083de5f)
• Use rules_cc everywhere in protobuf (ddadd0b)
• Upgrade rules_cc to 0.0.13 (3dd4835)
• Convert proto toolchain string to Label (aa181e2)
• Prepare supporting targets for testing (a748b10)
• Support --incompatible_enable_proto_toolchain_resolution (372ddb3)
• Move ProtoInfo and ProtoLangToolchainInfo from Bazel (426ca8a)
• Move java_{lite_}proto_library from Bazel repository (d77bdac)
• Move proto_toolchain from rules_proto to protobuf (9f9cb7a)
• Move proto_library from Bazel repository (3ff2cf0)
• Move proto_common implementation from Bazel binary (b19fbe6)

Compiler

• Begin adding extension numbers to SourceCodeInfo and FileDescriptorSet for tooling purposes. (07e489d)
• Update protoc release to include editions language features proto for Go (#19013) (63d966b)
• Introduce lifetimes for individual feature values. (0b6e768)
• Windows - Fix handling of utf8 command line arguments (#17854) (b9d1800)
• Limit feature deprecation warnings to reduce noise. (5cd9a46)

C++

• Fix C++ ifndef_guard printer to also convert "-" to "_". (7331b77)
• Fix C++ codegen namespace printer to print closing namespaces in reverse order. (3bf9c40)
• Fix raw_ptr.cc on exotic architectures (#18193) (63f6262)
• Fix cord handling in DynamicMessage and oneofs. (9e8b30c)
• Fix packed reflection handling bug in edition 2023. (4c92328)
• Add JsonStreamToMessage method (0259cc3)
• Introduce lifetimes for individual feature values. (0b6e768)
• Insert software prefetches into merge functions. This improves performance when hardware prefetchers are disabled on AMD machines. (d993365)
• Insert software prefetches into proto parsing functions. This improves performance when hardware prefetchers are disabled on AMD platforms. (8aa0add)
• Add prefetching of subsequent extensions in ExtensionSet::ForEach. (9b019ee)
• Remove the AnyMetadata class and use free functions instead. (920d5c3)
• Add [[deprecated]] attribute when generating enums and classes. (23aada2)
• Use linear search instead of binary search in flat mode of ExtensionSet. (0ed61f0)
• Prepare MessageLite::GetTypeName to be upgraded to return (30a8ef5)
• Limit feature deprecation warnings to reduce noise. (5cd9a46)
• Add Compiler Condition to use inline assembly optimizations with ARM64 for Compatibility with MSVC (#17671) (c5f6231)
• Enable small object optimization (SOO) for RepeatedField in order to reduce data indirections. (e2525e6)
• Return backing array memory to arena in ExtensionSet. (5ac8ee1)
• In edition 2024, Enum_Name(value) functions return absl::string_view by default. (e3fa6aa)
• Add Prefetchers to Proto Copy Construct to help address load misses (cdb7238)
• Reduced nesting in GenerateByteSize: slight readability improvements in generated code. (162a740)
• Introduce FieldDescriptor::cpp_string_type() API to replace direct ctype inspection which will be removed in the next breaking change (d0e49df)
• Update the comment of TextFormat::Printer::RegisterMessagePrinter that the method takes ownerhip of the printer pointer. (d911161)
• Prepare the code for migrating return types from const std::string& to (e13b8e9)

Java

• Remove deprecation warnings for Timestamp and Duration add/subtract/between that we do not yet have alternatives to. (f606c13)
• [29.x] Add missing java load (#19016) (bb287be)
• Give Kotlin jars an OSGi Manifest (#18812) (0c51eba)
• Re-export includingDefaultValueFields in deprecated state for important Cloud customer. (7321b2f)
• Restore compatibility with 3.22 gencode by re-adding mutableCopy helpers (1b1e90b)
• Speed up CodedOutputStream by extracting rarely-executed string formatting code (f8f5136)
• Return constant Value objects for true, false, and "" (4fbb0c5)
• Optimise CodedOutputStream.ArrayEncoder.writeFixed32NoTag/writeFixed64NoTag (a51f98c)
• CodedOutputStream: avoid updating position to go beyond end of array. (76ab5f2)
• Convert IndexOutOfBoundsException to OutOfSpaceException in UnsafeDirectNioEncoder (0e75d92)
• Suppress ReturnValueIgnored errorprone issues (bbbc7b9)
• Fix packed reflection handling bug in edition 2023. (4c92328)
• Move cc_proto_library from Bazel repository (5254448)
• Protobuf Lite ArrayLists: Defer allocating backing array until we have some idea how much to allocate. (05a8a40)
• Allocate correct-sized array when parsing packed fixed-width primitives (4e8469c)
• Bugfix: Make extensions beyond n=16 immutable. (ee419f2)
• Reserve capacity in ProtobufArrayList when calling Builder.addAllRepeatedMessage(Collection) (e3cc31a)
• Avoid allocating iterators when calling Message.Builder.addAllFoo(RandomAccess List) (bd1887e)
• Remove the AnyMetadata class and use free functions instead. (https://github.com/protocolbuffers/protobuf/com...

Protocol Buffers v29.0-rc3

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Bazel

• Add missing line to docstring after Args (#19213) (6f310d5)

Compiler

• Begin adding extension numbers to SourceCodeInfo and FileDescriptorSet for tooling purposes. (07e489d)
• Update protoc release to include editions language features proto for Go (#19013) (63d966b)

Java

• Remove deprecation warnings for Timestamp and Duration add/subtract/between that we do not yet have alternatives to. (f606c13)
• [29.x] Add missing java load (#19016) (bb287be)

Csharp

• Begin adding extension numbers to SourceCodeInfo and FileDescriptorSet for tooling purposes. (07e489d)

Python

• Fix a python bug when assign an empty Struct at creation. (#18977) (bb0d575)
• Add a deprecation warning to py_proto_library (#19032) (53cde64)

PHP

PHP C-Extension

• Fixed non-conformance in JSON parsing for empty strings in numeric fields. (#19259) (b69ea96)
• See also UPB changes below, which may affect PHP C-Extension.

Ruby

• Fixed non-conformance in JSON parsing for empty strings in numeric fields. (#19259) (b69ea96)

Ruby C-Extension

• Fixed non-conformance in JSON parsing for empty strings in numeric fields. (#19259) (b69ea96)
• See also UPB changes below, which may affect Ruby C-Extension.

UPB (Python/PHP/Ruby C-Extension)

• Fixed non-conformance in JSON parsing for empty strings in numeric fields. (#19259) (b69ea96)

Other

• Upgrade rules_cc 0.0.15 and rules_java 8.3.1 (#19215) (fb8ee79)

Protocol Buffers v29.0-rc2

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Bazel

• Fix proto_info_bzl (#18918) (083de5f)
• Use rules_cc everywhere in protobuf (ddadd0b)
• Upgrade rules_cc to 0.0.13 (3dd4835)
• Convert proto toolchain string to Label (aa181e2)
• Prepare supporting targets for testing (a748b10)

Java

• Give Kotlin jars an OSGi Manifest (#18812) (0c51eba)
• Re-export includingDefaultValueFields in deprecated state for important Cloud customer. (7321b2f)
• Restore compatibility with 3.22 gencode by re-adding mutableCopy helpers (1b1e90b)

Kotlin

• Give Kotlin jars an OSGi Manifest (#18812) (0c51eba)

Python

• Load Python rules everywhere in protobuf (a18f0de)

UPB (Python/PHP/Ruby C-Extension)

• Load Python rules everywhere in protobuf (a18f0de)

Other

• Upgrade rules_java and remove experimental_google_legacy_api flag (#18889) (f25389b)
• Replace use of C++17 with disabling a warning (111584f)
• Load Shell rules everywhere in protobuf (1822c8a)
• Fix Bazel dependency cycle issue affecting Kythe (#18768) (6df33a4)
• Remove rules_rust dependency (4329b89)
• Remove release branch staleness tests. (3551ee3)
• Remove javaopts requiring java8 in non-release builds. (98beac0)

Protocol Buffers v28.3

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

C++

• Fix packed reflection handling bug in edition 2023. (#18405) (c4124f9)

Java

• Mute the minor version warning #18096 (#18923) (fe30f9a)
• Populate Kotlin Manifest Files (#18859) (d82fb47)
• Re-export includingDefaultValueFields in deprecated state for important Cloud customer. (3b62d78)
• Cherrypick restoration of mutableCopy helpers (3ea568a)
• Fix packed reflection handling bug in edition 2023. (#18405) (c4124f9)

Kotlin

• Populate Kotlin Manifest Files (#18859) (d82fb47)

Python

• Mute the minor version warning #18096 (#18923) (fe30f9a)
• Fix packed reflection handling bug in edition 2023. (#18405) (c4124f9)

Other

• Fix merge conflicts (664a7e1)
• [ObjC] Disabling visionOS on CI. (22cd8ba)
• Update staleness tests to only run over release branch (#18398) (8e94b14)

Protocol Buffers v29.0-rc1

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Bazel

• Support --incompatible_enable_proto_toolchain_resolution (372ddb3)
• Move ProtoInfo and ProtoLangToolchainInfo from Bazel (426ca8a)
• Move java_{lite_}proto_library from Bazel repository (d77bdac)
• Move proto_toolchain from rules_proto to protobuf (9f9cb7a)
• Move proto_library from Bazel repository (3ff2cf0)
• Move proto_common implementation from Bazel binary (b19fbe6)

Compiler

• Introduce lifetimes for individual feature values. (0b6e768)
• Windows - Fix handling of utf8 command line arguments (#17854) (b9d1800)
• Limit feature deprecation warnings to reduce noise. (5cd9a46)

C++

• Fix C++ ifndef_guard printer to also convert "-" to "_". (7331b77)
• Fix C++ codegen namespace printer to print closing namespaces in reverse order. (3bf9c40)
• Fix raw_ptr.cc on exotic architectures (#18193) (63f6262)
• Fix cord handling in DynamicMessage and oneofs. (9e8b30c)
• Fix packed reflection handling bug in edition 2023. (4c92328)
• Add JsonStreamToMessage method (0259cc3)
• Introduce lifetimes for individual feature values. (0b6e768)
• Insert software prefetches into merge functions. This improves performance when hardware prefetchers are disabled on AMD machines. (d993365)
• Insert software prefetches into proto parsing functions. This improves performance when hardware prefetchers are disabled on AMD platforms. (8aa0add)
• Add prefetching of subsequent extensions in ExtensionSet::ForEach. (9b019ee)
• Remove the AnyMetadata class and use free functions instead. (920d5c3)
• Add [[deprecated]] attribute when generating enums and classes. (23aada2)
• Use linear search instead of binary search in flat mode of ExtensionSet. (0ed61f0)
• Prepare MessageLite::GetTypeName to be upgraded to return (30a8ef5)
• Limit feature deprecation warnings to reduce noise. (5cd9a46)
• Add Compiler Condition to use inline assembly optimizations with ARM64 for Compatibility with MSVC (#17671) (c5f6231)
• Enable small object optimization (SOO) for RepeatedField in order to reduce data indirections. (e2525e6)
• Return backing array memory to arena in ExtensionSet. (5ac8ee1)
• In edition 2024, Enum_Name(value) functions return absl::string_view by default. (e3fa6aa)
• Add Prefetchers to Proto Copy Construct to help address load misses (cdb7238)
• Reduced nesting in GenerateByteSize: slight readability improvements in generated code. (162a740)
• Introduce FieldDescriptor::cpp_string_type() API to replace direct ctype inspection which will be removed in the next breaking change (d0e49df)
• Update the comment of TextFormat::Printer::RegisterMessagePrinter that the method takes ownerhip of the printer pointer. (d911161)
• Prepare the code for migrating return types from const std::string& to (e13b8e9)

Java

• Speed up CodedOutputStream by extracting rarely-executed string formatting code (f8f5136)
• Return constant Value objects for true, false, and "" (4fbb0c5)
• Optimise CodedOutputStream.ArrayEncoder.writeFixed32NoTag/writeFixed64NoTag (a51f98c)
• CodedOutputStream: avoid updating position to go beyond end of array. (76ab5f2)
• Convert IndexOutOfBoundsException to OutOfSpaceException in UnsafeDirectNioEncoder (0e75d92)
• Suppress ReturnValueIgnored errorprone issues (bbbc7b9)
• Fix packed reflection handling bug in edition 2023. (4c92328)
• Move cc_proto_library from Bazel repository (5254448)
• Protobuf Lite ArrayLists: Defer allocating backing array until we have some idea how much to allocate. (05a8a40)
• Allocate correct-sized array when parsing packed fixed-width primitives (4e8469c)
• Bugfix: Make extensions beyond n=16 immutable. (ee419f2)
• Reserve capacity in ProtobufArrayList when calling Builder.addAllRepeatedMessage(Collection) (e3cc31a)
• Avoid allocating iterators when calling Message.Builder.addAllFoo(RandomAccess List) (bd1887e)
• Remove the AnyMetadata class and use free functions instead. (920d5c3)
• Add [[deprecated]] attribute when generating enums and classes. (23aada2)
• Binary compatibility shims for GeneratedMessageV3, SingleFieldBuilderV3, RepeatedFieldBuilderV3, and their nested classes to restore binary compatibility with <=v3.x.x generated code built against v3.x.x prior to v4.26.0 breaking release. (df8a11e)
• Implement a mechanism to control the output format of Message.toString within a Runnable instance. (737803e)
• Fix TextFormat.Parser to appropriately handle unknown values for open enums (df1aad4)
• Inline ArrayList's array into SmallSortedMap (910f627)
• Deprecated unused/obsolete mutable APIs, to be removed in next breaking change. (e889b0b)

Kotlin

• Support building //java with bzlmod (507ba36)
• Replace deprecated use of toBytes() with Character property .code (#18236) (5d9deab)

Objective-C

• [ObjC] Make debug runtime tell developers to update their generated code. (cdd3cf7)
• [ObjC] Issue stderr warnings for deprecated generation options. (e9140a1)
• [ObjC] Deprecate GPBUnknownFieldSet and related apis. (https://github.com/protocolbuffers/protobuf/comm...

Protocol Buffers v28.2

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

C++

• Fix cord handling in DynamicMessage and oneofs. (#18373) (5b0e543)

Java

• Add recursion check when parsing unknown fields in Java. (ac9fb5b)

Protocol Buffers v27.5

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

C++

• Fix cord handling in DynamicMessage and oneofs. (#18374) (6fa3f2d)

Java

• Add recursion check when parsing unknown fields in Java. (#18388)
  (8bfa80b)

Other

• Remove --copt="-Werror" from .bazelrc (#18392) (6481fec)

Protocol Buffers v25.5

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

C++

• Fix cord handling in DynamicMessage and oneofs. (#18375) (e673479)

Java

• Add recursion check when parsing unknown fields in Java. (4728531)

Python

• Fixed a SEGV when deep copying a non-reified sub-message. (94a2663)

Protocol Buffers v28.1

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

C++

• Fix compiler error with StrongReferenceToType() (8ea3bb1)

PHP

PHP C-Extension

• Upb: fix uninitialized upb_MessageValue buffer bugs (#18160) (9deedf0)
• See also UPB changes below, which may affect PHP C-Extension.

Ruby

Ruby C-Extension

• Fix a potential Ruby-upb use of uninitialized memory. (70b77de)
• Upb: fix uninitialized upb_MessageValue buffer bugs (#18160) (9deedf0)
• See also UPB changes below, which may affect Ruby C-Extension.

UPB (Python/PHP/Ruby C-Extension)

• Fix a potential Ruby-upb use of uninitialized memory. (70b77de)
• Upb: fix uninitialized upb_MessageValue buffer bugs (#18160) (9deedf0)

Protocol Buffers v28.0

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Compiler

• UPB text encoder without using reflection for Rust (used for a message's Debug trait) that will print out field number to value entries instead of field name to value entries of a message like how it's expected for the usual text format using reflection. (f9dd9ce)
• Enable MessageLite::DebugString to use Message::DebugString where possible. (f810cc5)
• Always report plugin support errors from protoc. (986ef8d)
• Stop supporting EDITION_PROTO2 as an alias for EDITION_LEGACY. (35b3425)
• Rename DynamicCastToGenerated/DownCastToGenerated to (18da465)
• Mark deleted fields in descriptor.proto reserved (44c409d)
• Protoc: support inf, -inf, nan, and -nan in option values (#15017) (3c03e93)

C++

• Move -Werror to our test/dev bazelrc files. (#17938) (f5a1b17)
• Introduce FieldDescriptor::cpp_string_type() API to replace direct ctype inspection which will be removed in the next breaking change (72b0b7a)
• Removed specific MSVC settings when installing (#17285) (770090e)
• Omit the _raw_default_instance_ declaration when using DLL linkage. (79c55cb)
• Enable MessageLite::DebugString to use Message::DebugString where possible. (f810cc5)
• Fix a bug in which proto code uses ctype instead of string_type internally. (dfbe987)
• Add an optimization that prevents an exponential number of comparisons on deeply (594a71f)
• Replace FindHelper() with BucketNumber() when only the bucket number is required. (8c7b1ec)
• Stop supporting EDITION_PROTO2 as an alias for EDITION_LEGACY. (35b3425)
• Rename DynamicCastToGenerated/DownCastToGenerated to (18da465)
• Prohibit using features in the same file they're defined in. (24b91a7)
• Implement new Debug API with redaction. (bb68eb2)
• Use bool HasHasbits(const FieldDescriptor*) instead of manual checks. (448e326)
• Add java to reserved names to escape extensions to java_. This may break existing references to gencode for extensions named java. (c99cf4b)
• Put arena cleanup nodes on a separate chunked list instead of at the ends of arena blocks. (f70d90b)
• Fix validation checks of implicit presence. (d6c2833)
• Clarify map behaviors in editions. (0dbd99a)
• Protoc: support inf, -inf, nan, and -nan in option values (#15017) (3c03e93)

Java

• Binary compatibility shims for GeneratedMessageV3, SingleFieldBuilderV3, RepeatedFieldBuilderV3, and their nested classes to restore binary compatibility with <=v3.x.x generated code built against v3.x.x prior to v4.26.0 breaking release. (6bf01c5)
• Remove unused pom.xml files. (aaf5f79)
• Add overload for LazyStringArrayList.add(String): boolean (761d49a)
• Hoist SmallSortedMap.getNumArrayEntries() outside loops over array entries (229c958)
• Omit the _raw_default_instance_ declaration when using DLL linkage. (79c55cb)
• Java: Deprecate newExtensionWriter. (7122ba1)
• Immutable java: Use new lower-allocation extension serialization APIs from gencode (4151486)
• Reserialize all unresolved features using java features from the generated pool in case of descriptors from the custom pool. (415a147)
• Fix delimited inheritance in all languages. (8beb970)
• Full java runtime: Avoid allocating ArrayList iterators when serializing UnknownFieldSet (fac847c)
• Move back deprecation of java utf8 feature to 2024. (bd7078d)
• Reparse unknown features using extension registry containing Java features. (68d9087)
• Remove field SmallSortedMap.maxArraySize (16e0a63)
• Delete unused method SmallSortedSet.getOverflowEntriesDescending (c05be32)
• Avoid allocating FieldSet iterator if FieldSet is empty (3ba7280)
• Lazily resolve features for proto2 and proto3 for compatibility with old open source gencode that does not invoke feature resolution from gencode static init. (11c27df)
• Implement new Debug API with redaction. (bb68eb2)
• Replace SmallSortedMap.EmptySet with equivalent Collections.emptySet() (c6e2778)
• Add java to reserved names to escape extensions to java_. This may break existing references to gencode for extensions named java. (c99cf4b)
• Avoid allocating TreeMap in UnknownFieldSet.Builder.asMap (4b7c2d4)
• Avoid allocating iterator in TextFormat printing UnknownFieldSet (8c6e5b7)
• Add null to the list of reserved words. (510c143)
• Add UnknownFieldSet.isEmpty (c56bddd)
• Java full runtime: Avoid allocating when calling asMap on empty UnknownFieldSet (d0b016f)
• Return the default instance when parsing from an empty byte[]. (f597991)
• Deprecate building from source with Maven to be removed in 4.28.x. (4c8da99)
• Java full runtime: Avoid allocating iterator if UnknownFieldSet's TreeMap is empty (4f12891)
• Proto java full runtime: avoid allocating Integers accessing enum lists (cc79f77)
• Split bootstrapped java_features.proto to keep it from leaking out. (2257232)
• Java Proto lite: avoid boxing Integers accessing enum lists (fb054c8)
• In the Kotlin DSL, reference builder methods with property syntax. (e9c9970)
• Java Proto Lite: Serialize repeated enums without allocating (de6aba9)
• Avoid boxing when ser...