Protocol Buffers Changelog

What's new in Protocol Buffers 3.27.0 RC 3

May 14, 2024

Announcements:
Protobuf News may include additional announcements or pre-announcements for upcoming changes.
Compiler:
Add extension declarations for known features. (f8d0a5b)
Java:
Add java to reserved names to escape extensions to java_. This may break existing references to gencode for extensions named java. (c18cb95)
Csharp:
Regenerate stale files (4c85a1a)
Python:
Add temporary alias for system_python.bzl at previous location . (#16787) (ffd753f)
PHP:
PHP C-Extension:
Regenerate stale files (4c85a1a)
Other:
Clear repository cache between bazel runs (3bc8667)
Work around windows path length limitations by moving immutable -> full in open source (new generator paths) and shortening long file names. (#16825) (615e704)

New in Protocol Buffers 3.27.0 RC 2 (May 9, 2024)

New in Protocol Buffers 3.27.0 RC 1 (Apr 18, 2024)

Compiler:
Officially release Editions in 27.0. (baa83b6)
Define lifetimes of edition 2023 features (77f62de)
Implement feature lifetime validation in protoc and the C++ runtime. (b3b4497)
Add edition lifetime options for feature specs. (b09b3e4)
Enable editions support for Java Lite. (500c953)
Release edition defaults CLI arguments. (7a0e10e)
Update protoc release to include editions language features protos for Java and C++ (6483c47)
C++:
[C++] Ensure we allocate overaligned types with aligned operator new. (11ef0ff)
Fix text-format delimited field handling (29c69ff)
In debug mode, after clearing oneof messages on arenas, poison them if ASAN. (8826baf)
Allow string_type for Edition 2023. (d8251eb)
Breaking change: Ensure we allocate overaligned types with aligned operator new. (11ef0ff)
Python JSON parser: Ignore invalid enum string values if ignore_unknown_fields is set (#15887) (86abf35)
Move java_features.proto to java/core/srce/main/resources (274bc7f)
Add an RAII namespace printer helper for C++ codegen. (8599ab5)
Enable editions support for Java Lite. (500c953)
Add an RAII ifndef helper for C++ codegen. (1087274)
Clear oneof message fields even on arena on non-OPT builds. (5c183bd)
Implement edition 2023 support in all Ruby runtimes. (bca8fb6)
Release edition defaults CLI arguments. (7a0e10e)
Deprecate Arena::CreateMessage for OSS. (d4bfe52)
Open sourcing reflection_visit_fieds. (cfc07df)
Fixed the use of c++ keywords within namespace names (#15954) (988194a)
Fix pkg-config metadata for shared abseil on windows (#15888) (fe6edca)
Add GetStringView() and GetRepeatedStringView() with scratch. (a3f5af0)
Avoid a 'may be used uninitialized' warning when built with '-c opt'. (#15846) (eb70b34)
Add software prefetch to ByteSizeLong (948ca2e)
Add prefetching in arena blocks. (9e57b8e)
Breaking change: Remove the deprecated always_print_primitive_fields option from Java, Python and C++ JSON parsers. (2699579)
Rename the 'includingDefaultValueWithoutPresenceFields' and 'always_print_without_presence_fields' to 'alwaysPrintFieldsWithNoPresence' in the Cpp, Py and Java JSON serializers for consistency. (7d43131)
Remove tags for arena cleanup nodes now that we have dedicated string cleanup blocks. (202b106)
Avoid unused-parameter warning in field accessor listeners. (f4d5c2c)
Add new 'always_print_without_presence_fields' option to the C++ JSON serializer. (671b61b)
Fail to build descriptor if ctype is specified for non string/bytes fields (8b4c7a1)
Check ctype() in DescriptorBuilder for edition 2023 and beyond. (307aeac)
Fail building descriptors if ctype is used for fields other than string or bytes. (403e207)
Fix generation of HasExtension and ExtensionSize functions to restrict to the (9f5be07)
Add the privacy manifest to the C++ CocoaPod. (982ea24)
Java:
Define lifetimes of edition 2023 features (77f62de)
Check that size is non-negative when reading string or bytes in StreamDecoder. (a94f57b)
Fix text-format delimited field handling (29c69ff)
Move java_features.proto to java/core/srce/main/resources (274bc7f)
Add java_features.proto to kotlin_mvn release (369732a)
Enable editions support for Java Lite. (500c953)
Fix descriptor to access type via getType() s.t. messages using delimited encoding are consistently treated as groups for Java lite. (9f001a9)
Make UnsafeByteOperations stable; removing experimental annotation. (0070ac1)
Fix features inheritance of oneof fields and extensions and fix/move unit tests to actually run. (eb10ebd)
Add software prefetch to ByteSizeLong (948ca2e)
Breaking change: Remove the deprecated always_print_primitive_fields option from Java, Python and C++ JSON parsers. (2699579)
Rename the 'includingDefaultValueWithoutPresenceFields' and 'always_print_without_presence_fields' to 'alwaysPrintFieldsWithNoPresence' in the Cpp, Py and Java JSON serializers for consistency. (7d43131)
Add a new 'includingDefaultValueWithoutPresenceFields' option to the Java parser which is intended to replace the current 'includingDefaultValueFields'. (58baeb4)
Kotlin:
Add java_features.proto to kotlin_mvn release (369732a)
Csharp:
C#: Optimize JSON parsing in JsonTokenizer (68e6e3e)
C#: Avoid string concatenation when looking up enum values by name. (e6684ac)
Cache StringBuilder instances in the .NET JsonTextTokenizer. (fac929d)
Enable Editions in the C# generator. (421040b)
Runtime support for Protobuf Editions in C#. (450022d)
Tweak "group to property name" mapping for C#. Under editions, where fields using a delimited encoding have independent field names from type names, we want to use the specified field name. (139ea4d)
C#: Ignore invalid enum string values in JSON, when invalid fields are being ignored. (55e50ba40679eb82269c62872116b...

New in Protocol Buffers 3.26.1 (Mar 27, 2024)

New in Protocol Buffers 3.26.0 RC 3 (Feb 29, 2024)

New in Protocol Buffers 3.25.3 (Feb 16, 2024)

New in Protocol Buffers 3.26.0 RC 2 (Feb 6, 2024)

Announcements:
This version includes breaking changes to: C++, Java, PHP, Python.
[PHP] Remove deprecated legacy class aliases. (#15709) (096e127)
[Java] Remove the deprecated always_print_primitive_fields option from Java, Python and C++ JSON parsers. (06e7cab)
[Python] Remove the deprecated always_print_primitive_fields option from Java, Python and C++ JSON parsers. (06e7cab)
[Python] Removed obsolete/duplicate setup.py from Python. (#15708) (5722aef)
[C++] Remove the deprecated always_print_primitive_fields option from Java, Python and C++ JSON parsers. (06e7cab)
Protobuf News may include additional announcements or pre-announcements for upcoming changes.
C++:
Breaking change: Remove the deprecated always_print_primitive_fields option from Java, Python and C++ JSON parsers. (06e7cab)
Rename the 'includingDefaultValueWithoutPresenceFields' and 'always_print_without_presence_fields' to 'alwaysPrintFieldsWithNoPresence' in the Cpp, Py and Java JSON serializers for consistency. (fc41e78)
Add new 'always_print_without_presence_fields' option to the C++ JSON serializer. (1f3bf1d)
Remove use of mach_absolute_time (#15554) (#15662) (8b0f6fd)
Check ctype() in DescriptorBuilder for edition 2023 and beyond. (0090f19)
Fail building descriptors if ctype is used for fields other than string or bytes. (624d65d)
[CPP] Add the privacy manifest to the C++ CocoaPod. (#15664) (e7888a1)
Java:
Breaking change: Remove the deprecated always_print_primitive_fields option from Java, Python and C++ JSON parsers. (06e7cab)
Rename the 'includingDefaultValueWithoutPresenceFields' and 'always_print_without_presence_fields' to 'alwaysPrintFieldsWithNoPresence' in the Cpp, Py and Java JSON serializers for consistency. (fc41e78)
Add a new 'includingDefaultValueWithoutPresenceFields' option to the Java parser which is intended to replace the current 'includingDefaultValueFields'. (043191b)
Force descriptor initialization of dependencies before internalUpdateFileDescriptor(). (#15718) (4dec1a7)
Correctly set maven-compiler-plugin to >= Java 1.8 per our minimum Java version (#15707) (6028cdb)
Update internalUpdateFileDescriptor() to synchronize setProto() and resolveAllFeatures() to avoid data races. (#15659) (225b080)
Objective-C:
[ObjC] Use a local to avoid warnings in 32bit builds. (#15665) (394aec8)
[ObjC] Add the privacy manifest to the ObjC CocoaPod. (#15663) (935fcb7)
Python:
Adhere to PEP 8 (#15127) (#15729) (3b92f4f)
Breaking change: Remove the deprecated always_print_primitive_fields option from Java, Python and C++ JSON parsers. (06e7cab)
Rename the 'includingDefaultValueWithoutPresenceFields' and 'always_print_without_presence_fields' to 'alwaysPrintFieldsWithNoPresence' in the Cpp, Py and Java JSON serializers for consistency. (fc41e78)
Add new including_default_value_without_presence_fields to Python JSON serializer. (c530216)
Breaking change: Removed obsolete/duplicate setup.py from Python. (#15708) (5722aef)
PHP:
Don't break the trace (#11311) (#15727) (3e99024)
Fix inconsistent timestamp json encode/decode (#12396) (#15726) (e99f27e)
Breaking change: Remove deprecated legacy class aliases. (#15709) (096e127)
Ruby:
Increased the size of the error message buffer by 4x, to 511 bytes. (#15728) (ab6bcba)
Move the RubyMessage.java JSON "include defaults" to use alwaysPrintFieldsWithNoPresence. (b5beba3)
UPB (Python/PHP/Ruby C-Extension):
Increased the size of the error message buffer by 4x, to 511 bytes. (#15728) (ab6bcba)
Other:
Add PrivacyInfo.xcprivacy (#15557) (#15661) (5a5ec6c)

New in Protocol Buffers 3.26.0 RC 1 (Jan 26, 2024)

Announcements:
This version includes breaking changes to: C++, Java, PHP, Python, Ruby.
[C++] Make protobuf comply with the C++ layering check (a7b0421)
[C++] Remove const GetArena method on RepeatedPtrField (748ab16)
[C++] Disallow incorrect ctype usage (755b690)
[C++] Remove deprecated std::string error collector overrides (543fbcd)
[C++] Promote ExtensionRange to a proper class (5b12bc8)
[C++] Remove deprecated clear APIs on repeated fields (229906f)
[C++] Remove C++ legacy syntax descriptor APIs (cf2d696)
[C++] Remove deprecated syntax APIs (715b543)
[C++] Remove deprecated SupportsUnknownEnumValues method (0a6a516)
[Java] Remove unused helper methods for creating new mutable arraylists. (7874474)
[Java] Use Editions features in Java full runtimes. (65c65c2)
[Java] Stop generating the "newInstance" method. This is not used anymore. (c0d08bd)
[Java] Remove unused overload of AbstractMessageLite.addAll that worked on a Collection instead of a List. (3b9bd6d)
[Java] Remove obsolete runtime internalBuildGeneratedFileFrom which was for backwards compatibility with old gencode. (9310d2e)
[Java] Remove unnecessary overloads of methods: (94a2a44)
[Java] Remove unnecessary generated overrides for GeneratedMessage.Builder methods: (7bff169)
[Java] The base class for generated messages will be GeneratedMessage, not GeneratedMessageV3.
(5df0387)
[Java] Remove deprecated runtime methods for compatibility with old v2.x.x gencode. (e555bd2)
[Java] Remove deprecated TextFormat print methods. These should be replaced by corresponding TextFormat.printer() methods. (dfb8a4c)
[Java] Lock down visibility for descriptor syntax APIs. (1aeacd4)
[Java] Make deprecated Java gencode PARSER variable private. (b4858b2)
[PHP] Validate UTF-8 in string setters, as previously announced. (d14dbbc)
[PHP] Remove support for PHP generic services (40ad3fa)
[Python] Made text_format output default to UTF-8. (bf00034)
[Python] Remove deprecated syntax accessor. (fd40c87)
[Python] Remove RegisterExtension in message class (4ebba68)
[Python] Reject extend repeated field with none iterable (Raise TypeError) (1658213)
[Python] Remove Deprecated APIs that add non top descriptor. (c51f111)
[Python] check if Timestamp is valid. (4f77929)
[Python] Remove msg.UnknownFields() support in pure python and cpp extension. (0eac77c)
[Ruby] Removed syntax and added has_presence?/is_packed?. (dbd4dce)
[Ruby] Fixed json_encode/json_decode to use the message's pool. (a8b8ea0)
[Ruby] Freeze is now recursive, affecting all sub-messages, maps, and repeated fields. (31313b1)
[Ruby] Fixed inconsistencies in Message#to_h, as previously announced. (fd69938)
[Ruby] Dropped support for Ruby DSL, as previously announced. (5cfc9e7)
[Ruby] Lock down visibility for descriptor syntax APIs. (1aeacd4)
[Ruby] Fixed json_encode/json_decode to use the message's pool. (a8b8ea0)
Protobuf News may include additional announcements or pre-announcements for upcoming changes.
Compiler:
Fix getting env variables on windows (#15518) (71b0b4e)
Proper fix utf8 command line arguments (#14253) (1eff9d7)
Allocate an editions FeatureSet extension for https://github.com/bufbuild/protobuf-es (fedd34d)
Make rules_ruby a dev-only dependency. (571b727)
C++:
Correct type_resolver_util to set syntax=proto3 instead of syntax=proto2 on proto3 files. (040dde7)
Remove edition getter from C++ descriptor APIs (93b219f)
Breaking change: Remove const GetArena method on RepeatedPtrField (748ab16)
Breaking change: Disallow incorrect ctype usage (755b690)
Breaking change: Remove deprecated std::string error collector overrides (543fbcd)
Breaking change: Promote ExtensionRange to a proper class (5b12bc8)
Breaking change: Remove deprecated clear APIs on repeated fields (229906f)
Breaking change: Remove C++ legacy syntax descriptor APIs (cf2d696)
Fixed UTF-8 TextFormat output to protect against invalid UTF-8 in string fields. (1ac8c04)
Breaking change: Remove deprecated syntax APIs (715b543)
Fix DurationToMilliseconds mult overflow (17b8dd6)
Breaking change: Remove deprecated SupportsUnknownEnumValues method (0a6a516)
Have Arena::Create support arena constructible types (578e07e)
Enforce stricter version checks for Protobuf C++ by removing the notion of "minimal version of protoc/headers"; exact version match is required. (6eed7a2)
Compare explicit zeroes from prototext in partially. (8c24163)
Move the declarations in SerialArena to more closely match the style guide. (349122f)
Java:
Drop Protobuf support for Android KitKat per EOL and add existing minimum Java 1.8 in Maven pom.xmls (303239d)
Breaking change: Remove unused helper methods for creating new mutable arraylists. (7874474)
Breaking change: Use Editions features in Java full runtimes. (65c65c2)
Breaking change: Stop generating the "newInstance" method. This is not used anymore. (c0d08bd)
Breaking change: Remove unused overload of AbstractMessageLite.addAll that worked on a Collection instead of a List. (3b9bd6d)
Breaking change: Remove obsolete runtime internalBuildGeneratedFileFrom which was for backwards compatibility with old gencode. (9310d2e)
Breaking change: Remove unnecessary overloads of methods: (94a2a44)
Breaking change: Remove unnecessary generated overrides for GeneratedMessage.Builder methods: (7bff169)
Breaking change: The base class for generated messages will be GeneratedMessage, not GeneratedMessageV3.
(5df0387)
Breaking change: Remove deprecated runtime methods for compatibility with old v2.x.x gencode. (e555bd2)
Breaking change: Remove deprecated TextFormat print methods. These should be replaced by corresponding TextFormat.printer() methods. (dfb8a4c)
Support pretty printing proto2 Extensions inside of proto3 Anys in TextFormat.Printer. (c8e0160)
Breaking change: Lock down visibility for descriptor syntax APIs. (1aeacd4)
Enable Protobuf version validations in Protobuf Java Full. (a2f9268)
Breaking change: Make deprecated Java gencode PARSER variable private. (b4858b2)
Add Automatic-Module-Name (#14562) (d580fde)
Use Editions features in Java, Kotlin, and Java Lite code generators. (90e1b49)
Kotlin:
Breaking change: Use Editions features in Java full runtimes. (65c65c2)
Breaking change: The base class for generated messages will be GeneratedMessage, not GeneratedMessageV3.
(5df0387)
Use Editions features in Java, Kotlin, and Java Lite code generators. (90e1b49)
Objective-C:
Improve handing of the WKT ObjC Category additions. (b146d14)
Add a unpack helper for GPBAny with extension support. (29fca8a)
Python:
Fixed a bug when deep copying a map field with a closed enum value. (ca5ca62)
Breaking change: Made text_format output default to UTF-8. (bf00034)
Fixed a SEGV when deep copying a non-reified sub-message. (b9e4894)
Make str(msg) in Python print raw UTF-8 strings. Only invalid UTF-8 is escaped. (f2a91b3)
Breaking Change: Remove RegisterExtension in message class (4ebba68)
Breaking Change: Reject extend repeated field with none iterable (Raise TypeError) (1658213)
Breaking Change: Remove Deprecated APIs that add non top descriptor. (c51f111)
Breaking Change: Check if Timestamp is valid. (4f77929)
[Python/upb] Fixed SEGV when attempting to delete a message attribute (de52944)
Breaking Change: Remove msg.UnknownFields() support in pure python and cpp extension. (0eac77c)
Breaking change: Remove deprecated syntax accessor. (fd40c87)
Fixed a bug where FileDescriptor maps like message_types_by_name could return descriptors from other files. (c05b320)
Mark the python generator for editions support. (b01bd1b)
Add support and partial CI coverage for Python 3.12 (24fef03)
Implement Editions in Pure Python. (15eccf3)
Properly untrack Python GC objects during deallocation. (e32d094)
Raise warnings for python syntax usages (c508a40)
Fixed Python memory leak in map lookup. (b0eeb35)
Fix handling of Unicode escapes in string data in textproto files. (62a435c)
PHP:
Raise minimum PHP version to 8.1, due to PHP 8.0 EOL per https://cloud.google.com/php/getting-started/supported-php-versions (3c8a3d2)
Breaking change: Validate UTF-8 in string setters, as previously announced. (d14dbbc)
Breaking change: Remove support for PHP generic services (40ad3fa)
Expand PHP generator to support overlapping subset of proto2. (b603fb6)
Feat: better debug info for PHP messages and repeated fields (#12718) (59d5006)
PHP C-Extension:
Breaking change: Validate UTF-8 in string setters, as previously announced. (d14dbbc)
Optimized binary/JSON parsing to no longer copy input data into a temp buffer. (588d5aa)
See also UPB changes below, which may affect PHP C-Extension.
Ruby:
Breaking change: Removed syntax and added has_presence?/is_packed?. (dbd4dce)
Breaking change: Fixed json_encode/json_decode to use the message's pool. (a8b8ea0)
Breaking change: Freeze is now recursive, affecting all sub-messages, maps, and repeated fields. (31313b1)
Breaking change: Fixed inconsistencies in Message#to_h, as previously announced. (fd69938)
Breaking change: Dropped support for Ruby DSL, as previously announced. (5cfc9e7)
In Ruby repeated fields, each_index actually iterates over the index (#11767) (f869cfa)
Breaking change: Lock down visibility for descriptor syntax APIs. (1aeacd4)
Make rules_ruby a dev-only dependency. (571b727)
Add support for extensions in CRuby, JRuby, and FFI Ruby (#14703) (42f8b77)
Add support for options in CRuby, JRuby and FFI (#14594) (ae1f2b7)
Ruby C-Extension:
Breaking change: Removed syntax and added has_presence?/is_packed?. (dbd4dce)
Breaking change: Fixed json_encode/json_decode to use the message's pool. (a8b8ea0)
Breaking change: Freeze is now recursive, affecting all sub-messages, maps, and repeated fields. (31313b1)
Breaking change: Fixed inconsistencies in Message#to_h, as previously announced. (fd69938)
Upb: fix Ruby bug which allowed map.delete(key) on a frozen map (df57e54)
Add support for extensions in CRuby, JRuby, and FFI Ruby (#14703) (42f8b77)
Add support for options in CRuby, JRuby and FFI (#14594) (ae1f2b7)
See also UPB changes below, which may affect Ruby C-Extension.
UPB (Python/PHP/Ruby C-Extension):
Wrap C++ headers in #ifdef __cplusplus. (fc2d9da)
Add kUpb_DecodeOption_AlwaysValidateUtf8 decode option, to force UTF-8 validation of proto2 strings. (d4dfb9c)
Fixed non-conformance in upb JSON enum decoding when ignoring unknown enum values. (c16ac66)
Fix upb's json decoder ignoring trailing characters after a successfully parsed object. (fa15c21)
Fix upb_MiniTable_GetOneof(miniTable, field) to work correctly if field is the very first field in the proto. (e6ea44c)
Enabled editions support for upb generated code. (cf3a6f5)
Upb: stop generating hazzers for repeated fields (fa62c92)
Other:
Extend Proto2 JSON test cases to cover more of the preexisting Proto3 JSON cases. (42ecd61)
Include JSON output tests with Proto2 messages in the conformance test suite. (255f95e)
Make the utf8_range implementation just in C (9c7d2b9)
Open-source editions Bazel rules for embedding defaults. (898d8fa)
Enable conformance tests over editions protos (a2ba8bc)
Move utf8_range into the protobuf repo (5ca8400)

New in Protocol Buffers 3.25.2 (Jan 10, 2024)

New in Protocol Buffers 3.25.1 (Nov 16, 2023)

New in Protocol Buffers 3.25.0 (Nov 2, 2023)

Announcements:
Protobuf News may include additional announcements or pre-announcements for upcoming changes.
Compiler:
Implement proto2/proto3 with editions (3813b66)
Defines Protobuf compiler version strings as macros and separates out suffix string definition. (3c59585)
Add utf8_validation feature back to the global feature set. (153028d)
Setting up version updater to prepare for poison pills and embedding version info into C++, Python and Java gencode. (4322e00)
Merge the protobuf and upb Bazel repos (7286ffc)
Editions: Introduce functionality to protoc for generating edition feature set defaults. (4019e25)
Editions: Migrate edition strings to enum in C++ code. (f083ebf)
Create a reflection helper for ExtensionIdentifier. (4d5ab73)
Editions: Provide an API for C++ generators to specify their features. (e897bcf)
Editions: Refactor feature resolution to use an intermediate message. (57d8049)
Publish extension declarations with declaration verifications. (e72b0e1)
Editions: Stop propagating partially resolved feature sets to plugins. (b66ef4c)
Editions: Migrate string_field_validation to a C++ feature (1f95830)
Editions: Include defaults for any features in the generated pool. (15863ff)
Protoc: parser rejects explicit use of map_entry option (#13479) (8f59292)
Protoc: validate that reserved range start is before end (#13474) (3be00f7)
Protoc: support identifiers as reserved names in addition to string literals (only in editions) (#13471) (e701f4f)
Drop support for Bazel 5. (a80daa2)
Allow code generators to specify whether or not they support editions. (2176a14)
C++:
Set PROTOBUF_EXPORT on InternalOutOfLineDeleteMessageLite() (#14434) (db89a51)
Update stale checked-in files (#14431) (ada0be8)
Apply PROTOBUF_NOINLINE to declarations of some functions that want it. (6e848b0)
Implement proto2/proto3 with editions (3813b66)
Make JSON UTF-8 boundary check inclusive of the largest possible UTF-8 character. (e80b8ec)
Reduce Map::size_type to 32-bits. Protobuf containers can't have more than (95d2b2e)
Defines Protobuf compiler version strings as macros and separates out suffix string definition. (3c59585)
Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated oneof accessors. (e33e0d2)
Fix bug in reflection based Swap of map fields. (bef5b75)
Add utf8_validation feature back to the global feature set. (153028d)
Setting up version updater to prepare for poison pills and embedding version info into C++, Python and Java gencode. (4322e00)
Add prefetching to arena allocations. (fbdeb5a)
Merge the protobuf and upb Bazel repos (7286ffc)
Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated repeated and map field accessors. (9a0a3cf)
Editions: Migrate edition strings to enum in C++ code. (f083ebf)
Workaround ICE on gcc 7.5 by not having one overload call the other one with a (0522054)
Create a reflection helper for ExtensionIdentifier. (4d5ab73)
Editions: Provide an API for C++ generators to specify their features. (e897bcf)
Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated string field accessors. (18c338a)
Editions: Refactor feature resolution to use an intermediate message. (57d8049)
Fixes for 32-bit MSVC. (66cf6b1)
Publish extension declarations with declaration verifications. (e72b0e1)
Export the constants in protobuf's any.h to support DLL builds. (fd24b1b)
Implement AbslStringify for the Descriptor family of types. (230232a)
Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated message field accessors. (064035c)
Editions: Stop propagating partially resolved feature sets to plugins. (b66ef4c)
Editions: Migrate string_field_validation to a C++ feature (1f95830)
Editions: Include defaults for any features in the generated pool. (15863ff)
Introduce C++ feature for UTF8 validation. (c7119e6)
Protoc: validate that reserved range start is before end (#13474) (3be00f7)
Remove option to disable the table-driven parser in protoc. (6d03f9b)
Lock down ctype=CORD in proto file. (b359e50)
Support split repeated fields. (5b5e5bf)
In OSS mode omit some extern template specializations. We have seen reports of (ab96824)
Automated rollback of commit adb2c4b. (0ea0052)
Allow code generators to specify whether or not they support editions. (2176a14)
Handle conflicting macros for FreeBSD (#13303) (2a95295)
Java:
Implement proto2/proto3 with editions (3813b66)
Remove synthetic oneofs from Java gencode field accessor tables. (9ad2268)
Timestamps.parse: Add error handling for invalid hours/minutes in the timezone offset. (8f85138)
Defines Protobuf compiler version strings as macros and separates out suffix string definition. (3c59585)
Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated oneof accessors.

New in Protocol Buffers 3.25.0 RC 2 (Oct 18, 2023)

New in Protocol Buffers 3.25.0 RC 1 (Oct 17, 2023)

Announcements:
Protobuf News may include additional announcements or pre-announcements for upcoming changes.
Compiler:
Implement proto2/proto3 with editions (3813b66)
Defines Protobuf compiler version strings as macros and separates out suffix string definition. (3c59585)
Add utf8_validation feature back to the global feature set. (153028d)
Setting up version updater to prepare for poison pills and embedding version info into C++, Python and Java gencode. (4322e00)
Merge the protobuf and upb Bazel repos (7286ffc)
Editions: Introduce functionality to protoc for generating edition feature set defaults. (4019e25)
Editions: Migrate edition strings to enum in C++ code. (f083ebf)
Create a reflection helper for ExtensionIdentifier. (4d5ab73)
Editions: Provide an API for C++ generators to specify their features. (e897bcf)
Editions: Refactor feature resolution to use an intermediate message. (57d8049)
Publish extension declarations with declaration verifications. (e72b0e1)
Editions: Stop propagating partially resolved feature sets to plugins. (b66ef4c)
Editions: Migrate string_field_validation to a C++ feature (1f95830)
Editions: Include defaults for any features in the generated pool. (15863ff)
Protoc: parser rejects explicit use of map_entry option (#13479) (8f59292)
Protoc: validate that reserved range start is before end (#13474) (3be00f7)
Protoc: support identifiers as reserved names in addition to string literals (only in editions) (#13471) (e701f4f)
Drop support for Bazel 5. (a80daa2)
Allow code generators to specify whether or not they support editions. (2176a14)
C++:
Apply PROTOBUF_NOINLINE to declarations of some functions that want it. (6e848b0)
Implement proto2/proto3 with editions (3813b66)
Make JSON UTF-8 boundary check inclusive of the largest possible UTF-8 character. (e80b8ec)
Reduce Map::size_type to 32-bits. Protobuf containers can't have more than (95d2b2e)
Defines Protobuf compiler version strings as macros and separates out suffix string definition. (3c59585)
Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated oneof accessors. (e33e0d2)
Fix bug in reflection based Swap of map fields. (bef5b75)
Add utf8_validation feature back to the global feature set. (153028d)
Setting up version updater to prepare for poison pills and embedding version info into C++, Python and Java gencode. (4322e00)
Add prefetching to arena allocations. (fbdeb5a)
Merge the protobuf and upb Bazel repos (7286ffc)
Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated repeated and map field accessors. (9a0a3cf)
Editions: Migrate edition strings to enum in C++ code. (f083ebf)
Workaround ICE on gcc 7.5 by not having one overload call the other one with a (0522054)
Create a reflection helper for ExtensionIdentifier. (4d5ab73)
Editions: Provide an API for C++ generators to specify their features. (e897bcf)
Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated string field accessors. (18c338a)
Editions: Refactor feature resolution to use an intermediate message. (57d8049)
Fixes for 32-bit MSVC. (66cf6b1)
Publish extension declarations with declaration verifications. (e72b0e1)
Export the constants in protobuf's any.h to support DLL builds. (fd24b1b)
Implement AbslStringify for the Descriptor family of types. (230232a)
Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated message field accessors. (064035c)
Editions: Stop propagating partially resolved feature sets to plugins. (b66ef4c)
Editions: Migrate string_field_validation to a C++ feature (1f95830)
Editions: Include defaults for any features in the generated pool. (15863ff)
Introduce C++ feature for UTF8 validation. (c7119e6)
Protoc: validate that reserved range start is before end (#13474) (3be00f7)
Remove option to disable the table-driven parser in protoc. (6d03f9b)
Lock down ctype=CORD in proto file. (b359e50)
Support split repeated fields. (5b5e5bf)
In OSS mode omit some extern template specializations. We have seen reports of (ab96824)
Automated rollback of commit adb2c4b. (0ea0052)
Allow code generators to specify whether or not they support editions. (2176a14)
Handle conflicting macros for FreeBSD (#13303) (2a95295)
Java:
Implement proto2/proto3 with editions (3813b66)
Remove synthetic oneofs from Java gencode field accessor tables. (9ad2268)
Timestamps.parse: Add error handling for invalid hours/minutes in the timezone offset. (8f85138)
Defines Protobuf compiler version strings as macros and separates out suffix string definition. (3c59585)
Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on generated oneof accessors. (e33e0d2)
Automated rollback of commit 2a55706. (30b6251)
Add missing debugging version info to Protob...

New in Protocol Buffers 3.24.4 (Oct 5, 2023)

New in Protocol Buffers 3.24.3 (Sep 7, 2023)

New in Protocol Buffers 3.24.2 (Aug 26, 2023)

New in Protocol Buffers 3.24.1 (Aug 19, 2023)

New in Protocol Buffers 3.24.0 (Aug 9, 2023)

Compiler:
Drop support for Bazel 5. (fff4905)
Allow code generators to specify whether or not they support editions. (e2cec78)
Release prototype of Protobuf Editions. (4f9e417)
Compiler: Correct depfile generation when there are no outputs (a44fc2b)
Add dllexport_decl for generated default instance. (#13085) (9d0961a)
In TSan mode, detect concurrent mutations of repeated/map fields. (d800c5f)
Add a workaround for GCC constexpr bug (e15326b)
Turn on the table-driven parser by default, as it is no longer experimental. (c3e2efe)
Shrink code size of generated protocol buffer code via a few (97c3513)
Implement enforcement of target constraints (e3848c1)
Fix(libprotoc): export useful symbols from .so (44b4bcc)
C++:
In OSS mode omit some extern template specializations. We have seen reports of compilers falling over due to the size of translation units. (2ed49c9)
Automated rollback of commit adb2c4b. (9f2d7ea)
Fix building shared libraries on MinGW-w64 (#13240) (c2f07bb)
Enable TSan validation to detect when a mutable accessor of a message is called concurrently with another accessor on the same message, which is a data race. (0275e51)
Release prototype of Protobuf Editions. (4f9e417)
Enable TSan validation to detect when a mutable accessor of a message is called concurrently with another accessor on the same message, which is a data race. (e2eae81)
Fix case of locality optimizer being wrong for split repeated fields and add a check that the optimized order has the same size as the unoptimized order. (76a327e)
Enable TSan validation to detect when a mutable accessor of a message is called concurrently with another accessor on the same message, which is a data race. (80dbc50)
Mark single arg ctor explicit in DynamicMessageFactory. (8fe88a5)
Enable TSan validation to detect when a mutable accessor of a message is called concurrently with another accessor on the same message, which is a data race. (6d79d13)
Let ParseRepeatedStringOnce call AllocateFromStringBlock(). (bcf3e36)
Check next tag in MpRepeatedMessage. (9e1cf6f)
When parsing repeated primitives, append to a tmp array on stack. (adb2c4b)
Add dllexport_decl for generated default instance. (#13085) (9d0961a)
TextFormat::ParseFieldValueFromString now takes absl::string_view as input instead of const std::string & (5411fc6)
In TSan mode, detect concurrent mutations of repeated/map fields. (d800c5f)
Use the same ABI for static and shared libraries on non-Windows platforms (#12983) (4329fde)
Replace ColdChunkSkipper with iterator-based approach. (ad677f3)
Check invalid type_id after casting it to uint32_t. (d890126)
Strengthen assertions on reflection methods. (eb5e9e0)
Add assertions to reflection methods. (5866e45)
Fail to parse message sets if type_id is zero. (bc1b1f6)
Enable the use of [SU]Int32Size and EnumSize templates for AArch64 (#11102) (e285d3e)
Add a workaround for GCC constexpr bug (e15326b)
Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on Map, RepeatedField and RepeatedPtrField. (7b7ba2d)
Turn on the table-driven parser by default, as it is no longer experimental. (c3e2efe)
Fix: avoid warnings on MSVC (#12697) (4fcf2c0)
Fix: avoid warnings on Windows (#12701) (f9108c2)
Shrink code size of generated protocol buffer code via a few (97c3513)
Fix(libprotoc): export useful symbols from .so (#12619) (b1ae4fa)
Forbid embedded nulls in json_name. (b478a29)
Implement option retention for C# (5f64444)
Implement enforcement of target constraints (e3848c1)
Make RepeatedField and RepeatedPtrField be destructor skippable for proto arenas. (e4168df)
Update MessageDifferencer to conditionally force comparing additional fields while doing PARTIAL comparison (compare fields which are not repeated, have no presence and are set to their default value). (748f57f)
CMake: Use the correct jsoncpp target name in static builds (#12733) (d372fcd)
Fix: missing -DPROTOBUF_USE_DLLS in pkg-config (#12700) (f86008a)
Avoid using string(JOIN..., which requires cmake 3.12 (adee0a5)
Java:
Put a 4k limit on preallocation to prevent OOM from malformed inputs. (173adca)
Mark OneofDescriptor.isSynthetic() deprecated. (b6b86e2)
Use ProtobufArrayList for repeated bytes field. Presize primitive arrays for fixed-length primitives. (b0b926a)
Add protobuf-kotlin into protobuf-bom (#12936) (943b696)
Handle clear for Java proto3 optionals (synthetic oneofs) using field descriptor instead of clear method. (a534902)
Deps: Update Guava to 32.0.0 (#12953) (cd615a8)
Migrate repeated numeric fields to use bit field to track presence instead of using it to indicate the field mutability to potentially skip work on the field during build operations. (f0de774)
Automated rollback of commit 3e188b7. (a1b3ff0)
Csharp:
[C#] Replace regex that validates descriptor names

New in Protocol Buffers 3.24.0 RC 3 (Aug 1, 2023)

New in Protocol Buffers 3.24.0 RC 2 (Jul 19, 2023)

New in Protocol Buffers 3.24.0 RC 1 (Jul 12, 2023)

Announcements:
Protobuf News may include additional announcements or pre-announcements for upcoming changes.
Compiler:
Release prototype of Protobuf Editions. (4f9e417)
Compiler: Correct depfile generation when there are no outputs (a44fc2b)
Add dllexport_decl for generated default instance. (#13085) (9d0961a)
In TSan mode, detect concurrent mutations of repeated/map fields. (d800c5f)
Add a workaround for GCC constexpr bug (e15326b)
Turn on the table-driven parser by default, as it is no longer experimental. (c3e2efe)
Shrink code size of generated protocol buffer code via a few (97c3513)
Implement enforcement of target constraints (e3848c1)
Fix(libprotoc): export useful symbols from .so (44b4bcc)
C++:
Fix building shared libraries on MinGW-w64 (#13240) (c2f07bb)
Enable TSan validation to detect when a mutable accessor of a message is called concurrently with another accessor on the same message, which is a data race. (0275e51)
Release prototype of Protobuf Editions. (4f9e417)
Enable TSan validation to detect when a mutable accessor of a message is called concurrently with another accessor on the same message, which is a data race. (e2eae81)
Fix case of locality optimizer being wrong for split repeated fields and add a check that the optimized order has the same size as the unoptimized order. (76a327e)
Enable TSan validation to detect when a mutable accessor of a message is called concurrently with another accessor on the same message, which is a data race. (80dbc50)
Mark single arg ctor explicit in DynamicMessageFactory. (8fe88a5)
Enable TSan validation to detect when a mutable accessor of a message is called concurrently with another accessor on the same message, which is a data race. (6d79d13)
Let ParseRepeatedStringOnce call AllocateFromStringBlock(). (bcf3e36)
Check next tag in MpRepeatedMessage. (9e1cf6f)
When parsing repeated primitives, append to a tmp array on stack. (adb2c4b)
Add dllexport_decl for generated default instance. (#13085) (9d0961a)
TextFormat::ParseFieldValueFromString now takes absl::string_view as input instead of const std::string & (5411fc6)
In TSan mode, detect concurrent mutations of repeated/map fields. (d800c5f)
Use the same ABI for static and shared libraries on non-Windows platforms (#12983) (4329fde)
Replace ColdChunkSkipper with iterator-based approach. (ad677f3)
Check invalid type_id after casting it to uint32_t. (d890126)
Strengthen assertions on reflection methods. (eb5e9e0)
Add assertions to reflection methods. (5866e45)
Fail to parse message sets if type_id is zero. (bc1b1f6)
Enable the use of [SU]Int32Size and EnumSize templates for AArch64 (#11102) (e285d3e)
Add a workaround for GCC constexpr bug (e15326b)
Add ABSL_ATTRIBUTE_LIFETIME_BOUND attribute on Map, RepeatedField and RepeatedPtrField. (7b7ba2d)
Turn on the table-driven parser by default, as it is no longer experimental. (c3e2efe)
Fix: avoid warnings on MSVC (#12697) (4fcf2c0)
Fix: avoid warnings on Windows (#12701) (f9108c2)
Shrink code size of generated protocol buffer code via a few (97c3513)
Fix(libprotoc): export useful symbols from .so (#12619) (b1ae4fa)
Forbid embedded nulls in json_name. (b478a29)
Implement option retention for C# (5f64444)
Implement enforcement of target constraints (e3848c1)
Make RepeatedField and RepeatedPtrField be destructor skippable for proto arenas. (e4168df)
Update MessageDifferencer to conditionally force comparing additional fields while doing PARTIAL comparison (compare fields which are not repeated, have no presence and are set to their default value). (748f57f)
CMake: Use the correct jsoncpp target name in static builds (#12733) (d372fcd)
Fix: missing -DPROTOBUF_USE_DLLS in pkg-config (#12700) (f86008a)
Avoid using string(JOIN..., which requires cmake 3.12 (adee0a5)
Java:
Mark OneofDescriptor.isSynthetic() deprecated. (b6b86e2)
Use ProtobufArrayList for repeated bytes field. Presize primitive arrays for fixed-length primitives. (b0b926a)
Add protobuf-kotlin into protobuf-bom (#12936) (943b696)
Handle clear for Java proto3 optionals (synthetic oneofs) using field descriptor instead of clear method. (a534902)
Deps: Update Guava to 32.0.0 (#12953) (cd615a8)
Migrate repeated numeric fields to use bit field to track presence instead of using it to indicate the field mutability to potentially skip work on the field during build operations. (f0de774)
Csharp:
[C#] Replace regex that validates descriptor names (#12174) (cfb702a)
Implement option retention for C# (5f64444)
Objective-C:
Release prototype of Protobuf Editions. (4f9e417)
Check invalid type_id after casting it to uint32_t. (d890126)
Fix jruby encoding in new thread (#12919) (6609bea)
Add assertions to reflection methods. (5866e45)
[C#] Replace regex that validates descriptor names (#12174) (cfb702a)
Python:
Raise warinings when extend repeated field with none iterable in OSS. OSS will raise errors

New in Protocol Buffers 3.23.4 (Jul 6, 2023)

New in Protocol Buffers 3.23.3 (Jun 14, 2023)

New in Protocol Buffers 3.23.2 (May 26, 2023)

New in Protocol Buffers 3.23.1 (May 17, 2023)

New in Protocol Buffers 3.23.0 (May 9, 2023)

Announcements:
Protobuf News may include additional announcements or pre-announcements for upcoming changes.
Compiler:
Implement a retain_options flag in protoc. (83507c7)
Make protoc --descriptor_set_out respect option retention (ae2531d)
Modify release artifacts for protoc to statically link system libraries. (723bd4c)
Extension declaration: Enforce that if the extension range has a declaration then all extensions in that range must be declared. This should prevent non-declared extensions from being added. (5dc171f)
Implement "reserved" for extension declaration. (41287bd)
Open-source extension declaration definition. (145900f)
C++:
Fix(libprotoc): export useful symbols from .so (46fb4aa)
Turn off clang::musttail on i386 (b40633f)
Fixes Clang 6 linker bug (49bb3f2)
Remove PROTOBUF_DEPRECATED in favor of [[deprecated]]. (5c59290)
Add assert to the list of keywords for C++. (a75c1a2)
Added Reflection::GetCord() method in C++ (6ecb5d0)
Support C++ protobuf ctype=CORD for bytes field (generated code). (714f975)
Expand LazySerializerEmitter to cover proto3 cases. (fab7f92)
Unconditionally generate unknown field accessors. (dd8a3cf)
Introduce proto filter for inject_field_listener_events. (2dc5338)
Add ParseFromCord to TextFormat (055a6c6)
Mark proto2::Arena::GetArena as deprecated. (9f95958)
Java:
Adds Timestamps.now(). (295f112)
Added Reflection::GetCord() method in C++ (6ecb5d0)
Re-attach OSGI headers to lite,core, and util. This information was dropped in the move from maven to bazel. (4b5652b)
Add Java FileDescriptor.copyHeadingTo() which copies file-level settings (e.g. syntax, package, file options) to FileDescriptorProto.Builder (6e6d0bc)
Remove unnecessary has bits from proto2 Java. (c440da9)
Add casts to make protobuf compatible with Java 1.8 runtime. (d40aadf)
Fix mutability bug in Java proto lite: sub-messages inside of oneofs were not (fa82155)
Document known quirks of EnumDescriptor::is_closed() when importing across files with different syntaxes. (1de344f)
Kotlin:
Remove errorprone dependency from kotlin protos. (7b6e828)
Csharp:
Make json_name take priority over name (fully) in C# parsing (#12262) (4326e0f)
Add C# presence methods to proto3 oneof fields. (affadac)
Objective-C:
Enforce the max message size when serializing to binary form. (e6d01b2)
Mark mergeFromData:extensionRegistry: as deprecated. (e3b0051)
Python:
Fix bug in _internal_copy_files where the rule would fail in downstream repositories. (b36c392)
Make numpy/pip_deps a test-only dependency. (fe038fc)
Fix Python bug with required fields (579f4ab)
Mark deprecated SupportsUnknownEnumValues on Message reflection. Use FieldDescriptor or EnumDescriptor instead. (0b9134b)
Raise warnings for MessageFactory class usages (dd9dd86)
Add Python support for retention attribute (63389c0)
Document known quirks of EnumDescriptor::is_closed() when importing across files with different syntaxes. (1de344f)
Python C-Extension (Default):
Fix Python bug with required fields (protocolbuffers/upb@ea4cb79)
See also UPB changes below, which may affect Python C-Extension (Default).
PHP:
RepeatedField: unset by index (#11425) (363fa89)
PHP C-Extension:
RepeatedField: unset by index (#11425) (363fa89)
See also UPB changes below, which may affect PHP C-Extension.
Ruby:
Change the Ruby code generator to emit a serialized proto instead of the DSL (#12319) (bd52d04)
Feat(6178): emit ruby enum as integer (#11673) (8aa2b17)
Ruby C-Extension:
Feat(6178): emit ruby enum as integer (#11673) (8aa2b17)
Ruby: Implement Write Barriers (#11793) (d82d8a4)
See also UPB changes below, which may affect Ruby C-Extension.
UPB (Python/PHP/Ruby C-Extension):
Implements upb_Message_DeepClone. (protocolbuffers/upb@3286f94)
Other:
Fix: missing -DPROTOBUF_USE_DLLS in pkg-config (#12700) (1ca4e9c)
Avoid using string(JOIN..., which requires cmake 3.12 (54caf40)
Bump Abseil submodule to 20230125.3 (#12660) (750a6e7)
Fix btree issue in map tests. (9898418)
Fix declared dependencies for pkg-config (#12518) (f79e35c)
Fix build for newlib (#12501) (945bf3c)
Update usage disclaimer on FieldOptions.ctype (b8e7192)
Add config option to print 64-bit integers in JSON as unquoted ints if they can be losslessly converted into a 64-bit float. (330e10d)
Version protoc according to the compiler version number. (e67136d)
Fix shared object ABI exports (#5144) (#11032) (462964e)
Ensure VarintParseSlowArm{32,64} are exported with PROTOBUF_EXPORT (2ce5639)
Update the min required CMake version to 3.10 (bcb20bb)

New in Protocol Buffers 3.23.0 RC 3 (May 6, 2023)

New in Protocol Buffers 3.22.4 (May 4, 2023)

New in Protocol Buffers 3.23.0 RC 2 (Apr 29, 2023)

New in Protocol Buffers 3.23.0 RC 1 (Apr 27, 2023)

Announcements:
This RC was abandoned before artifact publishing due to unintended breaking changes:
[Cpp] lock down visibility for FileDescriptor syntax APIs. (8b1be51)
[Java] Lock down visibility for FileDescriptor.getSyntax(). (8c8b2be)
[Ruby] Lock down visibility for FileDescriptor.getSyntax(). (8c8b2be)
Protobuf News may include additional announcements or pre-announcements for upcoming changes.
Compiler:
Implement a retain_options flag in protoc. (83507c7)
Make protoc --descriptor_set_out respect option retention (ae2531d)
Modify release artifacts for protoc to statically link system libraries. (723bd4c)
Extension declaration: Enforce that if the extension range has a declaration then all extensions in that range must be declared. This should prevent non-declared extensions from being added. (5dc171f)
Implement "reserved" for extension declaration. (41287bd)
Open-source extension declaration definition. (145900f)
C++:
Breaking change: lock down visibility for FileDescriptor syntax APIs. (8b1be51)
Remove PROTOBUF_DEPRECATED in favor of [[deprecated]]. (5c59290)
Add assert to the list of keywords for C++. (a75c1a2)
Added Reflection::GetCord() method in C++ (6ecb5d0)
Support C++ protobuf ctype=CORD for bytes field (generated code). (714f975)
Expand LazySerializerEmitter to cover proto3 cases. (fab7f92)
Unconditionally generate unknown field accessors. (dd8a3cf)
Introduce proto filter for inject_field_listener_events. (2dc5338)
Add ParseFromCord to TextFormat (055a6c6)
Mark proto2::Arena::GetArena as deprecated. (9f95958)
Java:
Adds Timestamps.now(). (295f112)
Breaking change: Lock down visibility for FileDescriptor.getSyntax(). (8c8b2be)
Added Reflection::GetCord() method in C++ (6ecb5d0)
Re-attach OSGI headers to lite,core, and util. This information was dropped in the move from maven to bazel. (4b5652b)
Add Java FileDescriptor.copyHeadingTo() which copies file-level settings (e.g. syntax, package, file options) to FileDescriptorProto.Builder (6e6d0bc)
Remove unnecessary has bits from proto2 Java. (c440da9)
Add casts to make protobuf compatible with Java 1.8 runtime. (d40aadf)
Fix mutability bug in Java proto lite: sub-messages inside of oneofs were not (fa82155)
Document known quirks of EnumDescriptor::is_closed() when importing across files with different syntaxes. (1de344f)
Kotlin:
Remove errorprone dependency from kotlin protos. (7b6e828)
Csharp:
Make json_name take priority over name (fully) in C# parsing (#12262) (4326e0f)
Add C# presence methods to proto3 oneof fields. (affadac)
Objective-C:
Enforce the max message size when serializing to binary form. (e6d01b2)
mark mergeFromData:extensionRegistry: as deprecated. (e3b0051)
Python:
Make numpy/pip_deps a test-only dependency. (fe038fc)
Mark sequence containers as Py_TPFLAGS_SEQUENCE, enabling pattern matching (a05c57d)
Fix Python bug with required fields (579f4ab)
Mark deprecated SupportsUnknownEnumValues on Message reflection. Use FieldDescriptor or EnumDescriptor instead. (0b9134b)
Raise warnings for MessageFactory class usages (dd9dd86)
Add Python support for retention attribute (63389c0)
Document known quirks of EnumDescriptor::is_closed() when importing across files with different syntaxes. (1de344f)
Python C-Extension (Default):
Fix Python bug with required fields (protocolbuffers/upb@ea4cb79)
See also UPB changes below, which may affect Python C-Extension (Default).
PHP:
RepeatedField: unset by index (#11425) (363fa89)
PHP C-Extension:
RepeatedField: unset by index (#11425) (363fa89)
See also UPB changes below, which may affect PHP C-Extension.
Ruby:
Change the Ruby code generator to emit a serialized proto instead of the DSL (#12319) (bd52d04)
Breaking change: Lock down visibility for FileDescriptor.getSyntax(). (8c8b2be)
Feat(6178): emit ruby enum as integer (#11673) (8aa2b17)
Ruby C-Extension:
Feat(6178): emit ruby enum as integer (#11673) (8aa2b17)
Ruby: Implement Write Barriers (#11793) (d82d8a4)
See also UPB changes below, which may affect Ruby C-Extension.
UPB (Python/PHP/Ruby C-Extension):
Implements upb_Message_DeepClone. (protocolbuffers/upb@3286f94)
Other:
Fix btree issue in map tests. (9898418)
Fix declared dependencies for pkg-config (#12518) (f79e35c)
Fix build for newlib (#12501) (945bf3c)
Update usage disclaimer on FieldOptions.ctype (b8e7192)
Add config option to print 64-bit integers in JSON as unquoted ints if they can be losslessly converted into a 64-bit float. (330e10d)
Version protoc according to the compiler version number. (e67136d)
Fix shared object ABI exports (#5144) (#11032) (462964e)
Ensure VarintParseSlowArm{32,64} are exported with PROTOBUF_EXPORT (2ce5639)
Update the min required CMake version to 3.10 (bcb20bb)

New in Protocol Buffers 3.22.3 (Apr 13, 2023)

New in Protocol Buffers 3.22.2 (Mar 11, 2023)

New in Protocol Buffers 3.22.1 (Mar 7, 2023)

New in Protocol Buffers 3.22.0 (Feb 18, 2023)

Announcements:
This version includes breaking changes to: Cpp.
[Cpp] Migrate to Abseil's logging library. (a9f1ea6)
[Cpp] proto2::Map::value_type changes to std::pair<const K, V>. (46656ed)
[Cpp] Mark final ZeroCopyInputStream, ZeroCopyOutputStream, and DefaultFieldComparator classes. (bf9c22e)
[Cpp] Add a dependency on Abseil (#10416)
[Cpp] Remove all autotools usage (#10132)
[Cpp] Add C++20 reserved keywords
[Cpp] Delete Arena::Init
[Cpp] Replace JSON parser with new implementation
[Cpp] Make RepeatedField::GetArena non-const in order to support split RepeatedFields.
You can refer to our migration guide for details on what C++ code changes will be necessary to be compatible with 22.0.
Protobuf News may include additional announcements or pre-announcements for upcoming changes.
Compiler:
Breaking change: Migrate to Abseil's logging library. (a9f1ea6)
Add debug_redact field option to protobuf. (9238c48)
Protoc: accept capital X to indicate hex escape in string literals (#10757)
Gracefully handle weird placement of linebreaks around comments (#10660)
Open up visibility for some compiler internals (#10608)
Protoc: validate reserved names are identifiers (#10586)
Protoc: validate custom json_name configuration (#10581)
Protoc: fix consistency with parsing very large decimal numbers (#10555)
Use protoc version for --version (#10386)
Fix for grpc.tools #17995 & protobuf #7474 (handle UTF-8 paths in argumentfile) (#10200)
Print full path name of source .proto file on error
Include proto message type in the annotation comments.
Maven artifact suffix format has changed to -RCN instead of -rc-N
C++:
Document known quirks of EnumDescriptor::is_closed() when importing across files with different syntaxes. (a594141)
Add C++ support for retention attribute (8f882e7)
Breaking change: Migrate to Abseil's logging library. (a9f1ea6)
No longer define no_threadlocal on OpenBSD (#10610)
CMake: Enable projects to set the C++ version (#10464)
Breaking Change: Add a dependency on Abseil (#10416)
Upgrade third_party/googletest submodule to current main branch (#10393)
Breaking Change: Remove all autotools usage (#10132)
CMake: use add_compile_options instead of add_definitions for compile options (#10293)
Fix #9947: make the ABI identical between debug and non-debug builds (#10271)
Allow for CMAKE_INSTALL_LIBDIR to be absolute (#10090)
Add header search paths to protobuf-c++ spec (#10024)
Cpp_generated_lib_linked support is removed in protoc
Reduced .pb.o object file size slightly by explicitly instantiating
Breaking Change: Add C++20 reserved keywords.
Fixed crash in ThreadLocalStorage for pre-C++17 compilers on 32-bit ARM.
Clarified that JSON API non-OK statuses are not a stable API.
Added a default implementation of MessageDifferencer::Reporter methods.
Proto2::MapPair is now an alias to std::pair.
Hide C++ RepeatedField::UnsafeArenaSwap
Use table-driven parser for reflection based objects.
Add ARM-optimized Varint decoding functions.
Minor optimization for parsing groups
Declare ReflectiveProtoHook class
Reduce size of VarintParse code in protocol buffers, by calling the shared
Avoid inlining some large heavily duplicated routines in repeated_ptr_field.h
Add ReflectiveProtoHook to Reflection.
Turns on table-driven parser for reflection based objects.
Save code space by avoiding inlining of large-in-aggregate code-space MessageLite::~MessageLite destructor.
Undefine the macro linux when compiling protobuf
Reduce memory consumption of MessageSet parsing.
Save code space by avoiding inlining of large-in-aggregate code-space MessageLite::~MessageLite destructor.
Breaking Change: Delete Arena::Init
Make a PROTOBUF_POISON/UNPOISON to reduce noise in the source
Put alignment functions in "arena_align.h"
Split off cleanup arena functions into "arena_cleanup.h"
Fix signed / unsigned match in CHECK_EQ
Kill Atomic<>. it's not pulling it's weight
Move AllocationPolicy out of arena_impl, and unify arena_config for bazel
Fix failure case in table-driven parser.
Breaking Change: Replace JSON parser with new implementation
Introduce the Printer::{SetRedactDebugString,SetRandomizeDebugString} private flags.
Introduce global flags to control Printer::{SetRedactDebugString, SetRandomizeDebugString}.
Proto3 string fields no longer trigger clang-tidy warning bugprone-branch-clone.
Fix the API of DescriptorUpgrader::set_allow_unknown_dependencies to set to True always, and to populate into the DescriptorPool as well.
Report line numbers consistently in text-format deprecated-field warnings.
Fixed C++ code generation for protos that use int32_t, uint32_t, int64_t, uint64_t, size_t as field names.
Annotate generated C++ public aliases for enum types.
Change default arena max block size from 8K to 32K.
Begin emitting semantic metadata for some C++ proto features. (2880fef)
Java:
Document known quirks of EnumDescriptor::is_closed() when importing across files with different syntaxes. (a594141)
Use LazyStringArrayList directly in gencode. (e6dd59e)
Add Java support for retention attribute (1325913)
Expect fail when serialize inf and nan for Value.number_value in json format. fixes #11259 (ca1cb1b)
Create a helper function that can make a mutable copy of any ProtobufList (5669606)
Add debug_redact field option to protobuf. (9238c48)
Remove unused package private class ProtobufLists. (b51c551)
Mark UnmodifiableLazyStringList deprecated. UnmodifiableLazyStringList is unnecessary and will be removed in a future release. (9595cbb)
Make emptyList public and mark the public EMPTY field as deprecated. (c658e27)
Enable Text format parser to skip unknown short-formed repeated fields. (6dbd413)
Expose internal setExtension method for Kotlin (33d1070)
Mark default instance as immutable first to avoid race during static initialization of default instances. (#10770)
Add serialVersionUID to ByteString and subclasses (#10718)
Fix serialization warnings in generated code when compiling with Java 18 and above (#10561)
Fix Timestamps fromDate for negative 'exact second' java.sql.Timestamps (#10321)
Fix Timestamps.fromDate to correctly handle java.sql.Timestamps before unix epoch (#10126)
Performance improvement for repeated use of FieldMaskUtil#merge by caching
Optimized Java proto serialization gencode for protos having many extension ranges with few fields in between.
More thoroughly annotate public generated code in Java lite protocol buffers.
Fixed Bug in proto3 java lite repeated enum fields. Failed to call copyOnWrite before modifying previously built message. Causes modification to already "built" messages that should be immutable.
Fix Java reflection serialization of empty packed fields.
Refactoring java full runtime to reuse sub-message builders and prepare to migrate parsing logic from parse constructor to builder.
Move proto wireformat parsing functionality from the private "parsing constructor" to the Builder class.
Change the Lite runtime to prefer merging from the wireformat into mutable messages rather than building up a new immutable object before merging. This way results in fewer allocations and copy operations.
Make message-type extensions merge from wire-format instead of building up instances and merging afterwards. This has much better performance.
Fix TextFormat parser to build up recurring (but supposedly not repeated) sub-messages directly from text rather than building a new sub-message and merging the fully formed message into the existing field.
Fix bug in nested builder caching logic where cleared sub-field builders would remain dirty after a clear and build in a parent layer. #10624
Add exemplar variants of the Java Any.is() and Any.unpack() methods. (60b7149)
Use bit-field int values in buildPartial to skip work on unset groups o...

New in Protocol Buffers 3.22.0 RC 2 (Feb 2, 2023)

New in Protocol Buffers 3.22.0 RC 1 (Feb 1, 2023)

Announcements:
This RC was only published for Java, Protoc, and Cocoapods.
This version includes breaking changes to: Cpp, Ruby.
[Cpp] Migrate to Abseil's logging library. (a9f1ea6)
[Cpp] proto2::Map::value_type changes to std::pair<const K, V>. (46656ed)
[Cpp] Mark final ZeroCopyInputStream, ZeroCopyOutputStream, and DefaultFieldComparator classes. (bf9c22e)
[Cpp] Add a dependency on Abseil (#10416)
[Cpp] Remove all autotools usage (#10132)
[Cpp] Add C++20 reserved keywords
[Cpp] Delete Arena::Init
[Cpp] Replace JSON parser with new implementation
[Cpp] Make RepeatedField::GetArena non-const in order to support split RepeatedFields.
[Ruby] Switch to releasing ruby source gems only.
Protobuf News may include additional announcements or pre-announcements for upcoming changes.
Compiler:
Breaking change: Migrate to Abseil's logging library. (a9f1ea6)
Add debug_redact field option to protobuf. (9238c48)
Protoc: accept capital X to indicate hex escape in string literals (#10757)
Gracefully handle weird placement of linebreaks around comments (#10660)
Open up visibility for some compiler internals (#10608)
Protoc: validate reserved names are identifiers (#10586)
Protoc: validate custom json_name configuration (#10581)
Protoc: fix consistency with parsing very large decimal numbers (#10555)
Use protoc version for --version (#10386)
Fix for grpc.tools #17995 & protobuf #7474 (handle UTF-8 paths in argumentfile) (#10200)
Print full path name of source .proto file on error
Include proto message type in the annotation comments.
C++:
Breaking change: Migrate to Abseil's logging library. (a9f1ea6)
No longer define no_threadlocal on OpenBSD (#10610)
CMake: Enable projects to set the C++ version (#10464)
Breaking Change: Add a dependency on Abseil (#10416)
Upgrade third_party/googletest submodule to current main branch (#10393)
Breaking Change: Remove all autotools usage (#10132)
CMake: use add_compile_options instead of add_definitions for compile options (#10293)
Fix #9947: make the ABI identical between debug and non-debug builds (#10271)
Allow for CMAKE_INSTALL_LIBDIR to be absolute (#10090)
Add header search paths to protobuf-c++ spec (#10024)
Cpp_generated_lib_linked support is removed in protoc
Reduced .pb.o object file size slightly by explicitly instantiating
Breaking Change: Add C++20 reserved keywords.
Fixed crash in ThreadLocalStorage for pre-C++17 compilers on 32-bit ARM.
Clarified that JSON API non-OK statuses are not a stable API.
Added a default implementation of MessageDifferencer::Reporter methods.
Proto2::MapPair is now an alias to std::pair.
Hide C++ RepeatedField::UnsafeArenaSwap
Use table-driven parser for reflection based objects.
Add ARM-optimized Varint decoding functions.
Minor optimization for parsing groups
Declare ReflectiveProtoHook class
Reduce size of VarintParse code in protocol buffers, by calling the shared
Avoid inlining some large heavily duplicated routines in repeated_ptr_field.h
Add ReflectiveProtoHook to Reflection.
Turns on table-driven parser for reflection based objects.
Save code space by avoiding inlining of large-in-aggregate code-space MessageLite::~MessageLite destructor.
Undefine the macro linux when compiling protobuf
Reduce memory consumption of MessageSet parsing.
Save code space by avoiding inlining of large-in-aggregate code-space MessageLite::~MessageLite destructor.
Breaking Change: Delete Arena::Init
Make a PROTOBUF_POISON/UNPOISON to reduce noise in the source
Put alignment functions in "arena_align.h"
Split off cleanup arena functions into "arena_cleanup.h"
Fix signed / unsigned match in CHECK_EQ
Kill Atomic<>. it's not pulling it's weight
Move AllocationPolicy out of arena_impl, and unify arena_config for bazel
Fix failure case in table-driven parser.
Breaking Change: Replace JSON parser with new implementation
Introduce the Printer::{SetRedactDebugString,SetRandomizeDebugString} private flags.
Introduce global flags to control Printer::{SetRedactDebugString, SetRandomizeDebugString}.
Proto3 string fields no longer trigger clang-tidy warning bugprone-branch-clone.
Fix the API of DescriptorUpgrader::set_allow_unknown_dependencies to set to True always, and to populate into the DescriptorPool as well.
Report line numbers consistently in text-format deprecated-field warnings.
Fixed C++ code generation for protos that use int32_t, uint32_t, int64_t, uint64_t, size_t as field names.
Annotate generated C++ public aliases for enum types.
Change default arena max block size from 8K to 32K.
Begin emitting semantic metadata for some C++ proto features. (2880fef)
Java:
Expect fail when serialize inf and nan for Value.number_value in json format. fixes #11259 (ca1cb1b)
Create a helper function that can make a mutable copy of any ProtobufList (5669606)
Add debug_redact field option to protobuf. (9238c48)
Remove unused package private class ProtobufLists. (b51c551)
Mark UnmodifiableLazyStringList deprecated. UnmodifiableLazyStringList is unnecessary and will be removed in a future release. (9595cbb)
Make emptyList public and mark the public EMPTY field as deprecated. (c658e27)
Enable Text format parser to skip unknown short-formed repeated fields. (6dbd413)
Expose internal setExtension method for Kotlin (33d1070)
Mark default instance as immutable first to avoid race during static initialization of default instances. (#10770)
Add serialVersionUID to ByteString and subclasses (#10718)
Fix serialization warnings in generated code when compiling with Java 18 and above (#10561)
Fix Timestamps fromDate for negative 'exact second' java.sql.Timestamps (#10321)
Fix Timestamps.fromDate to correctly handle java.sql.Timestamps before unix epoch (#10126)
Performance improvement for repeated use of FieldMaskUtil#merge by caching
Optimized Java proto serialization gencode for protos having many extension ranges with few fields in between.
More thoroughly annotate public generated code in Java lite protocol buffers.
Fixed Bug in proto3 java lite repeated enum fields. Failed to call copyOnWrite before modifying previously built message. Causes modification to already "built" messages that should be immutable.
Fix Java reflection serialization of empty packed fields.
Refactoring java full runtime to reuse sub-message builders and prepare to migrate parsing logic from parse constructor to builder.
Move proto wireformat parsing functionality from the private "parsing constructor" to the Builder class.
Change the Lite runtime to prefer merging from the wireformat into mutable messages rather than building up a new immutable object before merging. This way results in fewer allocations and copy operations.
Make message-type extensions merge from wire-format instead of building up instances and merging afterwards. This has much better performance.
Fix TextFormat parser to build up recurring (but supposedly not repeated) sub-messages directly from text rather than building a new sub-message and merging the fully formed message into the existing field.
Fix bug in nested builder caching logic where cleared sub-field builders would remain dirty after a clear and build in a parent layer. #10624
Add exemplar variants of the Java Any.is() and Any.unpack() methods. (60b7149)
Use bit-field int values in buildPartial to skip work on unset groups of fields. (2326aef)
Kotlin:
Add debug_redact field option to protobuf. (9238c48)
Expose internal setExtension method for Kotlin (33d1070)
Add missing public modifier to Kotlin generated code (#10616)
Add "public" modifier to Kotlin generated code (#10599)
Update rules_kotlin version (#10212)
Suppress deprecation warnings in Kotlin generated code.
Kotlin generated code comments now use kdoc format instead of javadoc.
Escape keywords in package names in proto generated code
Add Kotlin enum int value getters and setters
Csharp:
Make the MergeFrom method of type ReadOnlySequence public (#11124) (c4bac67)
Fix a bug in which a possibly invalidated swisstable reference is used. (5c5dcdd)
Fix .NET Native AOT warnings in Protobuf reflection (#11128) (c019a79)
Use forward slash instead of backslash in nuspec file (#11449) (724250d)
Add debug_redact field option to protobuf. (9238c48)
Expose internal setExtension method for Kotlin (33d1070)
Apply Obsolete attribute to deprecated enums and enum values in C# generated code (#10520)
Fix 32-bit floating point JSON parsing of maximal values for C# (#10514)
Retain existing array in RepeatedField.Clear (#10508)
Implement IComparable for the Duration type (C#) (#10441)
Implement correct map merging behavior for C# (#10339)
Support indented JSON formatting in C# (#9391)
Disambiguate generated properties in C# (#10269)
Bugfix/issue 8101 (#10268)
Expose plugin protos for C# (#10244)
Update to C# 10 and upgrade code style (#10105)
Fix failing FieldMask.Merge for well-known wrapper field types (#9602)
Helper method on Any to allow an any to be unpacked more easily (#9695)
Objective-C:
[ObjC] Boolean generation options support no value as "true". (7935932)
[ObjC] Put out of range closed enum extension values in unknown fields. (903639c)
[ObjC] Raise the min OS versions (and required Xcode) (#10652)
[ObjC] Provide a protocol for GPBExtensionRegistry's lookup support. (#10597)
Mark the syntax on GPBFileDescriptor as deprecated. (c79832b)
Add the concept of a "closed enum" and expose it from the GPBEnumDescriptor. (7bb699b)
Python:
Soft deprecate python MessageFactory (c80e7ef)
Add debug_redact field option to protobuf. (9238c48)
Raise errors when serialize inf and nan for Value.number_value in json format. fixes #11259 (883ec1c)
Resolve #10949: use raise from in json_format.py (#10966) (1e6f876)
Allow reserved enums to be negative (1f58f1d)
Make generated python files compatible with Cython (#11011) (9aa5272)
Raise KeyError in Python ServiceDescriptor.FindMethodByName (#9592) (#9998)
Changes ordering of printed fields in .pyi files from lexicographic to the same ordering found in the proto descriptor.
Adds GeneratedCodeInfo annotations to python proto .pyi outputs as a base64 encoded docstring in the last line of the .pyi file for code analysis tools.
Fix message factory's behavior in python cpp extension to return same message classes for same descriptor, even if the factories are different.
Add type annotation for enum value fields in enum classes.
Update sphinx 2.3.1 to 3.0.4 (c1a42b3)
Added is_closed to EnumDescriptor in protobuf python (da9de8d)
Python C-Extension (Default):
Add license file to pypi wheels. (protocolbuffers/upb@92dbe4b)
Append "ByDef" to names of message accessors that use reflection (protocolbuffers/upb@b747edb)
Implement upb_Map_Next() as the new upb_Map iterator (protocolbuffers/upb@03b1dee)
Move the wire type definitions into upb/wire/ where they belong (protocolbuffers/upb@ff6439f)
Replace and repair the integer hash table iterator: (protocolbuffers/upb@7056646)
Add Parse/Serialize templates to support shared_ptr/unique_ptr. (protocolbuffers/upb@d3ec4b6)
Fixes protocolbuffers/upb#869 (protocolbuffers/upb@41017ef)
Silently succeed when adding the same serialized file in Python (protocolbuffers/upb@e779b9d)
Different message factories will return same message class for same descriptor in python. (protocolbuffers/upb@470f06c)
Make upb numpy type checks consistent with pure python and cpp. (protocolbuffers/upb@79b735a)
Upb: fix NULL pointer bug in Python FFI (protocolbuffers/upb@c2c6427)
See also UPB changes below, which may affect Python C-Extension (Default).
PHP:
Fix: php 8.2 dynamic property warning in MapFieldIter (#11485) (8e636d5)
Chore: fix php lint (#11417) (ade256e)
Add debug_redact field option to protobuf. (9238c48)
[PHP]Added missing files and fix phpext_protobuf_ptr export in pecl version (#10689)
[PHP] Fix empty message serialization for Any (#10595)
[PHP] allow dynamic properties in Message (#10594)
[PHP] Added getContainingOneof and getRealContainingOneof to descriptor. (#10356)
Fix: PHP readonly legacy files for nested messages (#10320)
Migrating macos php builds from 7.0/7.3 to 7.4/8.0 (#10274)
Exposed more functions in FieldDescriptor and OneofDescriptor. (#10102)
Fixed PHP SEGV by not writing to shared memory for zend_class_entry. (#9995)
Feat: [PHP] remove legacy generate class file (#9621)
PHP C-Extension:
Add debug_redact field option to protobuf. (9238c48)
Update PHP and Ruby to use the new accessors, delete the old ones (3f36a91)
Update Ruby to use the newer upb_Map_Next() iterator (8809a11)
Fix the ruby and php builds which were broken by a recent upb change (9cdf347)
See also UPB changes below, which may affect PHP C-Extension.
Ruby:
Breaking Change: Switch to releasing ruby source gems only. (0daf8b8)
Migrate ruby release targets to genrule to work around Bazel 5 bug (#11619) (e207bcd)
Add ruby release targets (#11468) (5b27b4f)
Remove support for ruby 2.5. (4958971)
Add debug_redact field option to protobuf. (9238c48)
Update PHP and Ruby to use the new accessors, delete the old ones (3f36a91)
Replace libc strdup usage with internal impl to restore musl compat. (#10811)
Auto capitalize enums name in Ruby (#10454)
Ruby: Use class inheritance to save memory (#10281)
Ruby: use a valid instance variable name for descriptor (#10282)
Ruby C-Extension:
Add retention and target field options in descriptor.proto (5a56837)
Add ruby release targets (#11468) (5b27b4f)
Add debug_redact field option to protobuf. (9238c48)
Update PHP and Ruby to use the new accessors, delete the old ones (3f36a91)
Hide ruby native extension symbols on FreeBSD (#10832) (2a73e3b)
Update Ruby to use the newer upb_Map_Next() iterator (8809a11)
See also UPB changes below, which may affect Ruby C-Extension.
UPB (Python/PHP/Ruby C-Extension):
Expect fail when serialize inf and nan for Value.number_value in json format. fixes #11259 (protocolbuffers/upb@651550c)
Add ::protos::Parse template for Ptr. (protocolbuffers/upb@b5384af)
Upb_Array_Resize() now correctly clears new values (protocolbuffers/upb@02cf7aa)
Fix unset mini table field presence bug (protocolbuffers/upb@9ab09b4)
Allow reserved enums to be negative (protocolbuffers/upb@1b0b06f)
Fix UPB_LIKELY() for 32-bit Windows builds (protocolbuffers/upb@9582dc2)
Fix C compiler failure when there are fields names prefixed with accessor prefixes such as set_ and clear_. (protocolbuffers/upb@d76e286631eb89b621be)
Make upb backwards and forwards compatible with Bazel 4.x, 3.5.x and LTS (protocolbuffers/upb@04957b1)
Other:
Upgrade to Abseil LTS 20230117 (#11622) (7930cd1)
Fixed Visual Studio 2022: protobufsrcgoogleprotobufarena.cc(457,51): error C2127: 'thread_cache_': illegal initialization of 'constinit' entity with a non-constant expression #11672 (#11674) (c2e99a1)
Clean up a few issues with ARM-optimized varint decoding. (bbe2e68)
Fix bool parser for map entries to look at the whole 64-bit varint and not just (43e5937)
Breaking Change: proto2::Map::value_type changes to std::pair<const K, V>. (46656ed)
Breaking Change: Mark final ZeroCopyInputStream, ZeroCopyOutputStream, and DefaultFieldComparator classes. (bf9c22e)
Deprecate repeated field cleared elements API. (84d8b00)
Breaking change: Make RepeatedField::GetArena non-const in order to support split RepeatedFields. (514c9a8)
Add EpsCopyInputStream::ReadCord() providing an efficient direct Cord API (bc4c156)
Add static asserts to container classes. (5a8abe1)
Fix proto deserialization issue when parsing a packed repeated enum field whose (afdf6da)
Use the "shldq" decoder for the specialized 64-bit Varint parsers, rather than (0ca97a1)
Use @utf8_range to reference //third_party/utf8_range (#11352) (2dcd7d8)
Place alignas() before lifetime specifiers (#11248) (5712e1a)
Add UnknownFieldSet::SerializeToCord() (8661e45)
Add support for repeated Cord fields. (b97005b)
Add Cord based Parse and Serialize logic to MessageLite (ddde013)
Add 'ReadCord and 'WriteCord functions to CodedStream (e5e2ad8)
Add CordInputStream and CordOutputStream providing stream support directly from/to Cord data (8afd1b6)
Add a WriteCord() method to ZeroCopyInputStream (192cd09)
Unify string and cord cleanup nodes in TaggedNode (0783c82)
Open source google/protobuf/bridge/message_set.proto (c04f842)
FileOutputStream: Properly pass block_size to CopyingOutputStreamAdaptor (1b1e399)
Implement ZeroCopyInputStream::ReadCord() in terms of absl::CordBuffer (75d31be)
Changing bazel skylib version from 1.2.1 to 1.3.0 (#10979) (1489e8d)
Update zlib to 1.2.13. (#10786)
Make jsoncpp a formal dependency (#10739)
Upgrade to MSVC 2017, since 2015 is no longer supported (#10437)
Update CMake configuration to add a dependency on Abseil (#10401)
Use release version instead of libtool version in Makefile (#10355)
Fix missing google::protobuf::RepeatedPtrField<std::string> issue in GCC (225b936)

New in Protocol Buffers 3.21.12 (Dec 14, 2022)

New in Protocol Buffers 3.21.11 (Dec 8, 2022)

New in Protocol Buffers 3.21.10 (Dec 1, 2022)

New in Protocol Buffers 3.21.9 (Oct 26, 2022)

New in Protocol Buffers 3.21.8 (Oct 18, 2022)

New in Protocol Buffers 3.21.7 (Sep 30, 2022)

New in Protocol Buffers 3.21.6 (Sep 15, 2022)

New in Protocol Buffers 3.21.5 (Aug 10, 2022)

New in Protocol Buffers 3.21.4 (Jul 26, 2022)

New in Protocol Buffers 3.21.3 (Jul 21, 2022)

New in Protocol Buffers 3.21.2 Pre-release (Jun 24, 2022)

New in Protocol Buffers 3.21.1 (May 28, 2022)

New in Protocol Buffers 3.21.0 (May 26, 2022)

C++:
cmake: Call get_filename_component() with DIRECTORY mode instead of PATH mode (#9614)
Escape GetObject macro inside protoc-generated code (#9739)
Update CMake configuration to add a dependency on Abseil (#9793)
Fix cmake install targets (#9822)
Use __constinit only in GCC 12.2 and up (#9936)
Java:
Update protobuf_version.bzl to separate protoc and per-language java … (#9900)
Python:
Increment python major version to 4 in version.json for python upb (#9926)
The C extension module for Python has been rewritten to use the upb library.
This is expected to deliver significant performance benefits, especially when
parsing large payloads. There are some minor breaking changes, but these
should not impact most users. For more information see:
https://developers.google.com/protocol-buffers/docs/news/2022-05-06#python-updates
Fixed win32 build and fixed str(message) on all Windows platforms. (#9976)
The binary wheel for macOS now supports Apple silicon.
PHP:
[PHP] fix PHP build system (#9571)
Fix building packaged PHP extension (#9727)
fix: reserve "ReadOnly" keyword for PHP 8.1 and add compatibility (#9633)
fix: phpdoc syntax for repeatedfield parameters (#9784)
fix: phpdoc for repeatedfield (#9783)
Change enum string name for reserved words (#9780)
chore: [PHP] fix phpdoc for MapField keys (#9536)
Fixed PHP SEGV by not writing to shared memory for zend_class_entry. (#9996)
Ruby:
Allow pre-compiled binaries for ruby 3.1.0 (#9566)
Implement respond_to? in RubyMessage (#9677)
[Ruby] Fix RepeatedField#last, #first inconsistencies (#9722)
Do not use range based UTF-8 validation in truffleruby (#9769)
Improve range handling logic of RepeatedField (#9799)
Support x64-mingw-ucrt platform
Other:
[Kotlin] remove redundant public modifiers for compiled code (#9642)
[C#] Update GetExtension to support getting typed value (#9655)
Fix invalid dependency manifest when using descriptor_set_out (#9647)
Fix C# generator handling of a field named "none" in a oneof (#9636)
Add initial version.json file for 21-dev (#9840)
Remove duplicate java generated code (#9909)
Cherry-pick PR #9981 into 21.x branch (#10000)

New in Protocol Buffers 3.21.0 RC 2 (May 20, 2022)

New in Protocol Buffers 3.21.0 RC 1 (May 12, 2022)

Versions:
Versioning scheme is changing to decouple major versions for languages
Minor and patch versions will remain coupled
Compilers and releases will refer to the version as just the minor and micro versions (i.e. 21.0)
See here for more information on this change
C++:
Rename main cmake/CMakeLists.txt to CMakeLists.txt (#9603)
avoid allocating memory if all extension are cleared (#9345)
cmake: Call get_filename_component() with DIRECTORY mode instead of PATH mode (#9614)
Escape GetObject macro inside protoc-generated code (#9739)
Update CMake configuration to add a dependency on Abseil (#9793)
Use __constinit only in GCC 12.2 and up (#9936)
Refactor generated message class layout
Optimize tokenizer ParseInteger by removing division
Reserve exactly the right amount of capacity in ExtensionSet::MergeFrom
Parse FLT_MAX correctly when represented in JSON
Java:
Update protobuf_version.bzl to separate protoc and per-language java … (#9900)
6x speedup in ArrayEncoder.writeUInt32NotTag
Python:
Increment python major version to 4 in version.json for python upb (#9926)
The C extension module for Python has been rewritten to use the upb library.
This is expected to deliver significant performance benefits, especially when
parsing large payloads. There are some minor breaking changes, but these
should not impact most users. For more information see:
https://developers.google.com/protocol-buffers/docs/news/2022-05-06#python-updates
Due to the breaking changes for Python, the major version number for Python
has been incremented.
The binary wheel for macOS now supports Apple silicon.
PHP:
chore: [PHP] fix phpdoc for MapField keys (#9536)
[PHP] Remove unnecessary zval initialization (#9600)
[PHP] fix PHP build system (#9571)
Fix building packaged PHP extension (#9727)
fix: reserve "ReadOnly" keyword for PHP 8.1 and add compatibility (#9633)
fix: phpdoc syntax for repeatedfield parameters (#9784)
fix: phpdoc for repeatedfield (#9783)
Change enum string name for reserved words (#9780)
Fixed composer.json to only advertise compatibility with PHP 7.0+. (#9819)
Ruby:
Allow pre-compiled binaries for ruby 3.1.0 (#9566)
Implement respond_to? in RubyMessage (#9677)
[Ruby] Fix RepeatedField#last, #first inconsistencies (#9722)
Do not use range based UTF-8 validation in truffleruby (#9769)
Improve range handling logic of RepeatedField (#9799)
Disable the aarch64 build on macOS until it can be fixed. (#9816)
Compiler:
Protoc outputs the list of suggested field numbers when invalid field
numbers are specified in the .proto file.
Require package names to be less than 512 bytes in length
Other:
[Kotlin] remove redundant public modifiers for compiled code (#9642)
[C#] Update GetExtension to support getting typed value (#9655)
Fix invalid dependency manifest when using descriptor_set_out (#9647)
Fix C# generator handling of a field named "none" in a oneof (#9636)
Add initial version.json file for 21-dev (#9840)
Remove duplicate java generated code (#9909)
Fix versioning issues in 3.20.0

New in Protocol Buffers 3.20.1 (May 1, 2022)

New in Protocol Buffers 3.20.1 RC 1 (Apr 6, 2022)

New in Protocol Buffers 3.20.0 (Apr 5, 2022)

New in Protocol Buffers 3.20.0 Pre-release (Mar 26, 2022)

New in Protocol Buffers 3.20.0 RC 2 (Mar 17, 2022)

Use dedicated helper functions for map descriptors by @acozzette in #9099
Prevent integer overflow for unknown fields in Python by @roehling in #7016
Add GetDebugString to Python FileDescriptor interface. by @psobot in #7498
Merge 3.18.x into master by @acozzette in #9109
Python: fix usages of deprecated assertRaisesRegexp by @acozzette in #9098
Update maven-surefire-plugin to 3.0.0-M5. by @cpovirk in #7830
Suppress dot-delimiter warning if ruby_package consists of a single component by @qnighy in #7276
Fix Python 3.10 C++ tests by @acozzette in #9128
Reserve extension id range for protoc-gen-checker by @upils in #9133
Merge 3.19.x into master by @acozzette in #9136
Make IsDescriptor* helpers lenient about descriptor name by @acozzette in #9127
examples: update Go example by @neild in #7217
Fix distcheck test by updating example Go file paths by @acozzette in #9137
Fix wkt dupes by @perezd in #8942
[Python] Provide a type alias ValueType on EnumTypeWrapper for mypy-protobuf compatibility by @nipunn1313 in #8182
Fix grammatical error in the descriptor protobuf definition by @Inconnu08 in #9151
for windows build fail issue, confliction with std max by @appledragon in #9144
Transition to NIO StandardCharsets by @belugabehr in #9148
JS: Fixed ReferenceError: window is not defined by @MarnixBouhuis in #9156
[Ruby] Fix memory leak in MessageClass.encode by @peterzhu2118 in #9150
Update checked-in C# generated code by @acozzette in #9158
for old clang build issue, related with https://reviews.llvm.org/D12375 by @appledragon in #9159
Fix comment syntax in any.proto by @chrisbainbridge in #8792
Improvement: better ruby from_* support in well_known_types.rb by @jufemaiz in #8254
Standardize on Array copyOf by @belugabehr in #9162
Remove unittest2 imports by @thisch in #9171
Fix benchmark by making sure we use Python 3 by @acozzette in #9170
Add pbkit to third_party.md by @disjukr in #9177
Merge 3.19.x into master by @acozzette in #9169
Implement unambiguous comparisons for RepeatedPtrIterator in C++20 by @mumbleskates in #9139
Use repo-relative labels wherever possible by @Wyverald in #9187
Creates a protoc release zip by @perezd in #9188
Update our build script to publish Mac aarch_64 binaries by @acozzette in #9203
Remove unnecessary dependency from @com_google_protobuf//:protobuf_java_util by @eikemeier in #9195
Creating bazel toolchains to compile for macOS. by @deannagarcia in #9210
[C++] Fix missing #ifdef for undefined identifiers by @rpvela in #9201
Fix typo in docstring by @tomerv in #9208
[C#] Update .NET SDKs to LTS versions by @JamesNK in #9205
Changing cpp version back to 8 by @deannagarcia in #9214
Update BUILD paths by @deannagarcia in #9217
Fix .NET SourceLink and warnings in NuGet package by @JamesNK in #8466
Fix dotnet aarch64 by @jtattermusch in #9222
Update BUILD paths by @deannagarcia in #9224
Update BUILD by @deannagarcia in #9226
Update include directories by @deannagarcia in #9227
Change sysroot flags by @deannagarcia in #9235
Add a envvar to provide a prefix on all proto package prefixed symbols. by @thomasvl in #9233
Support no_package:FILE in the expected prefixes file. by @thomasvl in #9234
Update BUILD by @deannagarcia in #9242
Update BUILD by @deannagarcia in #9243
Update toolchains.bazelrc by @deannagarcia in #9244
Adding windows toolchains by @deannagarcia in #9250
Remove unused includes from unit tests by @acozzette in #9251
Use C++11 integer types and fully qualify std::string by @acozzette in #9253
Name protoc artifacts by their cpu and os by @deannagarcia in #9252
delete unused files by @elharo in #9262
remove UTF8Utils class that hasn't been needed since Java 6 by @elharo in #9266
No error throwing for unknown OS by @deannagarcia in #9267
[C#] Fix trim warnings by @JamesNK in #9182
Small tweaks to C# unit tests by @acozzette in #9271
Fixing windows builds by @deannagarcia in #9276
Change include directories by @deannagarcia in #9277
Add comma by @deannagarcia in #9278
Add protoc-gen-go-svc to options.md by @dane in #9280
Fix broken max macro on Windows by @Kerisa in #9273
Dropped Ruby 2.3 and 2.4 support for CI and releases. by @haberman in #9311
show less log junk from Maven by @elharo in #9309
remove unused test proto by @elharo in #9298
Add space to fix error message formatting. by @thomasvl in #9316
Change windows cross compile includes by @deannagarcia in #9317
Change toolchain includes by @deannagarcia in #9318
Project import generated by Copybara by @copybara-service in #9333
Pin multibuild scripts to get manylinux1 wheels back by @jtattermusch in #9216
fix spelling errors by @elharo in #9368
Fix Ruby release build by pinning rake-compiler-dock version by @acozzette in #9372
Improve performance of parsing unknown fields in Java by @acozzette in #9371
Default two more of the options from env variables. by @thomasvl in #9376
update GSON to 2.8.9 by @elharo in #9367
BUILD: Set protoc binary file mode to 0555 in release archive by @LINKIWI in #9354
Update, fix, or delete an assortment of broken links by @elharo in #9381
Revert "Transition to NIO StandardCharsets" by @elharo in #9382
restore Android API level 14 compatibility by @elharo in #9386
restore even more Android API level 14 compatibility by @elharo in #9388
turn on animal-sniffer by @elharo in #9383
Update protojure link by @ghaskins in #9389
Revert "Standardize on Array copyOf" by @acozzette in #9400
Merge 3.19.x into master by @acozzette in #9402
Update CHANGES.txt to include recent Java security advisory by @acozzette in #9403
Add $(nproc) to make documentation by @aminvakil in #9360
remove Proto2MessageLiteInfoFactory and Proto3MessageLiteInfoFactory by @elharo in #9407
Adding kotlin bazel tests by @deannagarcia in #9408
Update location of llvm-ar in bazel toolchain by @deannagarcia in #9429
Migrate kotlin bazel tests from kt_jvm_test by @deannagarcia in #9428
Use constexpr for FieldTypeClass by @gjasny in #9434
link with correct C runtime on MSVC by @r2d3 in #9437
Updated Ruby to the current version of upb by @haberman in #9436
Use proper SPDX license identifier by @Shortfinga in #9441
simplify mergeable UI messages by @elharo in #9445
Disable [[clang::musttail]] attribute on Windows x86 by @ngg in #9422
Add ToProto() method to all C# descriptor classes by @jskeet in #9426
Must build project before running benchmarks by @elharo in #9454
Merge 3.19.x into master by @acozzette in #9452
Selectively add source or gen dir to includes. by @comius in #9438
Fixes NullReferenceException when accessing FieldDescriptor.IsPacked by @xoofx in #9430
Update package.xml by @deannagarcia in #9459
Fix checking Windows platform with preprocessor by @Biswa96 in #9460
Use matching soname when building with CMake as Makefile by @mrjoel in #9178
Add cmake option protobuf_INSTALL to not install files by @jcooky in #7123
fixing php 8.1 deprecation warnings by @brettmc in #9370
[cleanup] Msvc warnings by @stephenatwork in #9263
Match service argument names to abstract interface by @nipunn1313 in #9418
Resolve more java field accessor name conflicts by @philsttr in #8198
add test for clone of non-empty message by @elharo in #9193
[CMAKE] protobuf::libprotoc and protobuf::protoc should be optional in legacy protobuf-module.cmake when crossing compiling. by @owent in #9307
for ios shared library export api visibility by @appledragon in #9160
Enable testing via CTest by @florin-crisan in #8737
Add option to use external GTest in CMake by @florin-crisan in #8736
objective-c: Add default_objc_class_prefix generation option. by @dnkoutso in #9476
Dropped support for Python < 3.7 by @haberman in #9480
Integrate from Piper for C++, Java, and Python by @haberman in #9479
Integrate from Piper for C++, Java, and Python by @haberman in #9482
[CMake] Allow custom plugin options e.g. to generate mocks by @tiolan in #9105
[Ruby] Message.decode/encode: Add max_recursion_depth option by @lfittl in #9218
Ignore Eclipse metafiles by @elharo in #9485
Ruby: rename max_recursion_depth to recursion_limit by @acozzette in #9486
fix: use E_USER_ERROR for trigger_error calls by @dwsupplee in #9462
fix: [PHP] add missing reserved classnames by @bshaffer in #9458
Added Embedded Proto to options.md by @BartHertog in #9493
Fix conversion of singleton classes in Ruby by @antstorm in #9342
#9293 - incompatible return type php 8.1 by @oleg1540 in #9301
Add an option to preserve proto names in JsonFormatter by @ObsidianMinor in #6307
Fix the benchmark job and delete old Python configs by @acozzette in #9497
Fixing Kotlin tests by @deannagarcia in #9494
Remove Proto3LiteTest.kt by @deannagarcia in #9496
Add protoc-gen-fieldmask to third-party doc by @idodod in #9505
Use internal kotlin gen rule by @deannagarcia in #9508
Changes to build aarch64 under manylinux. by @haberman in #9510
Add test scope to kotlin-test for protobuf-kotlin-lite by @alexvanyo in #9518
Integrate from Piper for C++, Java, and Python by @dlj-NaN in #9522
Change sysroot flags by @deannagarcia in #9524
Integrate from Piper for C++, Java, and Python by @dlj-NaN in #9525
Integrate from Piper for C++, Java, and Python by @dlj-NaN in #9528
Revert "objective-c: Add default_objc_class_prefix generation option." by @dnkoutso in #9532
cmake: Set correct sonames for libprotobuf-lite.so and libprotoc.so (#8635) by @Arfrever in #9529
Add prefix_to_proto_package_mappings_path ObjC option. by @dnkoutso in #9498
Rename ExpectedPrefixesCollector to PackageToPrefixesCollector by @thomasvl in #9544
Make the ObjC support conditional to darwin. by @thomasvl in #9543
Fix package naming rule by @deannagarcia in #9537
[ObjC] Rename proto_package_to_prefix_mappings_path to package_to_prefix_mappings_path. by @dnkoutso in #9552
Make protoc executable names consistent by @deannagarcia in #9553
Update JRuby 9.2.19.0 -> 9.2.20.1 and 9.3.0.0 to 9.3.3.0. by @JasonLunn in #9549
Fix update_version.py script by @acozzette in #9554
chore: gitignore ephemeral files that clangd uses by @devjgm in #9555
Change toolchain artifact name patterns by @deannagarcia in #9558
ObjC Generation/Validation Options Cleanups by @thomasvl in #9559
Add bazel rules to do Kotlin mvn exports by @deannagarcia in #9560
Simplify imports of the WKTs within the library itself. by @thomasvl in #9565
Suppress warning for intentional circular require by @ntkme in #9556
cmake: Use linker version scripts by @Arfrever in #9545
Integrate from Piper for C++, Java, and Python by @acozzette in #9570
[editors/emacs] Fix protobuf-mode definition by @kunhtkun in #9572
Add a generation option to control use of forward declarations in headers. by @thomasvl in #9568
Integrate from Piper for C++, Java, and Python by @acozzette in #9576
Update protobuf version to 3.20.0-rc1 by @acozzette in #9579
Lower minimum CMake version to 3.5 by @acozzette in #9580
Update CHANGES.txt for 3.20.0 release by @acozzette in #9581
Updated PHP upb, and utf8_range for Ruby/PHP by @haberman in #9585
adding php81 support to release notes by @brettmc in #9590
[C#] fix parse failure for extensions with large field numbers by @homuler in #9591
CMake fixes by @Arfrever in #9595
Add ruby_upb_alloc using xrealloc/xfree so Ruby GC is aware of allocated memory for Arenas. by @zhangskz in #9586
[Ruby] allow encode json options to be an object that responds to to_hash by @lukad in #9513
Merge master into 3.20.x by @acozzette in #9588
[PHP] Remove unnecessary zval initialization by @zeriyoshi in #9600
Merge 3.20.x into master by @acozzette in #9604
Rename main cmake/CMakeLists.txt to CMakeLists.txt by @Arfrever in #9603
Replace gradle plugin by @oneiros-de in #9611
avoid allocating memory if all extension are cleared by @liuzhijiang in #9345
clean up language by @elharo in #9577
Changing toolchain build file by @deannagarcia in #9610
[PHP] fix PHP build system by @zeriyoshi in #9571
cmake: Call get_filename_component() with DIRECTORY mode instead of PATH mode by @Arfrever in #9614
Enable GeneratedDescriptorTest.EnormousDescriptor test for GCC/Clang CMake builds by @Arfrever in #9617
Updated Ruby to the latest upb. by @haberman in #9589
Removing toolchain_dir variable by @deannagarcia in #9628
Add alternative instructions for Homebrew users. by @JasonLunn in #9638
Toolchain cleanups by @deannagarcia in #9640

New in Protocol Buffers 3.20.0 RC 1 (Mar 5, 2022)

Ruby:
Dropped Ruby 2.3 and 2.4 support for CI and releases. (#9311)
Message.decode/encode: Add max_recursion_depth option (#9218)
Rename max_recursion_depth to recursion_limit (#9486)
Fix conversion of singleton classes in Ruby (#9342)
Suppress warning for intentional circular require (#9556)
JSON will now output shorter strings for double and float fields when possible
without losing precision.
Encoding and decoding of binary format will now work properly on big-endian
systems.
UTF-8 verification was fixed to properly reject surrogate code points.
Unknown enums for proto2 protos now properly implement proto2's behavior of
putting such values in unknown fields.
Java:
Revert "Standardize on Array copyOf" (#9400)
Resolve more java field accessor name conflicts (#8198)
Don't support map fields in DynamicMessage.Builder.{getFieldBuilder,getRepeatedFieldBuilder}
Fix parseFrom to only throw InvalidProtocolBufferException
InvalidProtocolBufferException now allows arbitrary wrapped Exception types.
Fix bug in FieldSet.Builder.mergeFrom
Flush CodedOutputStream also flushes underlying OutputStream
When oneof case is the same and the field type is Message, merge the
subfield. (previously it was replaced.)’
Add @CheckReturnValue to some protobuf types
Report original exceptions when parsing JSON
Add more info to @deprecated javadoc for set/get/has methods
Fix initialization bug in doc comment line numbers
Fix comments for message set wire format.
Kotlin:
Add test scope to kotlin-test for protobuf-kotlin-lite (#9518)
Add orNull extensions for optional message fields.
Add orNull extensions to all proto3 message fields.
Python:
Dropped support for Python < 3.7 (#9480)
Protoc is now able to generate python stubs (.pyi) with --pyi_out
Pin multibuild scripts to get manylinux1 wheels back (#9216)
Fix type annotations of some Duration and Timestamp methods.
Repeated field containers are now generic in field types and could be used
in type annotations.
Protobuf python generated codes are simplified. Descriptors and message
classes' definitions are now dynamic created in internal/builder.py.
Insertion Points for messages classes are discarded.
has_presence is added for FieldDescriptor in python
Loosen indexing type requirements to allow valid index() implementations
rather than only PyLongObjects.
Fix the deepcopy bug caused by not copying message_listener.
Added python JSON parse recursion limit (default 100)
Path info is added for python JSON parse errors
Pure python repeated scalar fields will not able to pickle. Convert to list
first.
Timestamp.ToDatetime() now accepts an optional tzinfo parameter. If
specified, the function returns a timezone-aware datetime in the given time
zone. If omitted or None, the function returns a timezone-naive UTC datetime
(as previously).
Adds client_streaming and server_streaming fields to MethodDescriptor.
Add "ensure_ascii" parameter to json_format.MessageToJson. This allows smaller
JSON serializations with UTF-8 or other non-ASCII encodings.
Added experimental support for directly assigning numpy scalars and array.
Improve the calculation of public_dependencies in DescriptorPool.
Compiler:
Migrate IsDefault(const std::string*) and UnsafeSetDefault(const std::string*)
Implement strong qualified tags for TaggedPtr
Rework allocations to power-of-two byte sizes.
Migrate IsDefault(const std::string*) and UnsafeSetDefault(const std::string*)
Implement strong qualified tags for TaggedPtr
Make TaggedPtr Set...() calls explicitly spell out the content type.
Check for parsing error before verifying UTF8.
Enforce a maximum message nesting limit of 32 in the descriptor builder to
guard against stack overflows
Fixed bugs in operators for RepeatedPtrIterator
Assert a maximum map alignment for allocated values
Fix proto1 group extension protodb parsing error
Do not log/report the same descriptor symbol multiple times if it contains
more than one invalid character.
Add UnknownFieldSet::SerializeToString and SerializeToCodedStream.
Remove explicit default pointers and deprecated API from protocol compiler
Arenas:
Change Repeated*Field to reuse memory when using arenas.
Implements pbarenaz for profiling proto arenas
Introduce CreateString() and CreateArenaString() for cleaner semantics
Fix unreferenced parameter for MSVC builds
Add UnsafeSetAllocated to be used for one-of string fields.
Make Arena::AllocateAligned() a public function.
Determine if ArenaDtor related code generation is necessary in one place.
Implement on demand register ArenaDtor for InlinedStringField
C++:
Enable testing via CTest (#8737)
Add option to use external GTest in CMake (#8736)
CMake: Set correct sonames for libprotobuf-lite.so and libprotoc.so (#8635) (#9529)
Add cmake option protobuf_INSTALL to not install files (#7123)
CMake: Allow custom plugin options e.g. to generate mocks (#9105)
CMake: Use linker version scripts (#9545)
Manually *struct Cord fields to work better with arenas.
Manually destruct map fields.
Generate narrower code
Fix #9378 by removing
shadowed cached_size field
Remove GetPointer() and explicit nullptr defaults.
Add proto_h flag for speeding up large builds
Add missing overload for reference wrapped fields.
Add MergedDescriptorDatabase::FindAllFileNames()
RepeatedField now defines an iterator type instead of using a pointer.
Remove obsolete macros GOOGLE_PROTOBUF_HAS_ONEOF and GOOGLE_PROTOBUF_HAS_ARENAS.
PHP:
Fix: add missing reserved classnames (#9458)
C#:
Fix trim warnings (#9182)
Fixes NullReferenceException when accessing FieldDescriptor.IsPacked (#9430)
Add ToProto() method to all descriptor classes (#9426)
Add an option to preserve proto names in JsonFormatter (#6307)
Objective-C:
Add prefix_to_proto_package_mappings_path option. (#9498)
Rename proto_package_to_prefix_mappings_path to package_to_prefix_mappings_path. (#9552)
Add a generation option to control use of forward declarations in headers. (#9568)

New in Protocol Buffers 3.19.4 (Jan 28, 2022)

New in Protocol Buffers 3.19.3 (Jan 11, 2022)

New in Protocol Buffers 3.19.2 (Jan 5, 2022)

New in Protocol Buffers 3.19.1 (Oct 29, 2021)

New in Protocol Buffers 3.19.0 (Oct 21, 2021)

New in Protocol Buffers 3.19.0 RC 2 (Oct 19, 2021)

New in Protocol Buffers 3.19.0 RC 1 (Oct 17, 2021)

New in Protocol Buffers 3.18.1 (Oct 5, 2021)

New in Protocol Buffers 3.18.0 (Sep 15, 2021)

C++:
Fix warnings raised by clang 11 (#8664)
Make StringPiece constructible from std::string_view (#8707)
Add missing capability attributes for LLVM 12 (#8714)
Stop using std::iterator (deprecated in C++17). (#8741)
Move field_access_listener from libprotobuf-lite to libprotobuf (#8775)
Fix #7047 Safely handle setlocale (#8735)
Remove deprecated version of SetTotalBytesLimit() (#8794)
Support arena allocation of google::protobuf::AnyMetadata (#8758)
Fix undefined symbol error around SharedCtor() (#8827)
Fix default value of enum(int) in json_util with proto2 (#8835)
Better Smaller ByteSizeLong
Introduce event filters for inject_field_listener_events
Reduce memory usage of DescriptorPool
For lazy fields copy serialized form when allowed.
Re-introduce the InlinedStringField class
v2 access listener
Reduce padding in the proto's ExtensionRegistry map.
GetExtension performance optimizations
Make tracker a static variable rather than call static functions
Support extensions in field access listener
Annotate MergeFrom for field access listener
Fix incomplete types for field access listener
Add map_entry/new_map_entry to SpecificField in MessageDifferencer. They
record the map items which are different in MessageDifferencer's reporter.
Reduce binary size due to fieldless proto messages
TextFormat: ParseInfoTree supports getting field end location in addition to
start.
Fix repeated enum extension size in field listener
Enable Any Text Expansion for Descriptors::DebugString()
Switch from int{8,16,32,64} to int{8,16,32,64}_t
Java:
Fix errorprone conflict (#8723)
Removing deprecated TimeUtil class. (#8749)
Optimized FieldDescriptor.valueOf() to avoid array copying.
Removing deprecated TimeUtil class.
Add Durations.parseUnchecked(String) and Timestamps.parseUnchecked(String)
FieldMaskUtil: Add convenience method to mask the fields out of a given proto.
JavaScript:
Optimize binary parsing of repeated float64
Fix for optimization when reading doubles from binary wire format
Replace toArray implementation with toJSON.
PHP:
Migrate PHP & Ruby to ABSL wyhash (#8854)
Added support for PHP 8.1 (currently in RC1) to the C extension (#8964)
Fixed PHP SEGV when constructing messages from a destructor. (#8969)
Ruby:
Move DSL implementation from C to pure Ruby (#8850)
Fixed a memory bug with RepeatedField#+. (#8970)
Python:
Drops support for 2.7 and 3.5.
Other:
[csharp] ByteString.CreateCodedInput should use ArraySegment offset and count (#8740)
[ObjC] Add support for using the proto package to prefix symbols. (#8760)
field_presence.md: fix Go example (#8788)

New in Protocol Buffers 3.18.0 RC 2 (Sep 1, 2021)

C++:
Fix warnings raised by clang 11 (#8664)
Make StringPiece constructible from std::string_view (#8707)
Add missing capability attributes for LLVM 12 (#8714)
Stop using std::iterator (deprecated in C++17). (#8741)
Move field_access_listener from libprotobuf-lite to libprotobuf (#8775)
Fix #7047 Safely handle setlocale (#8735)
Remove deprecated version of SetTotalBytesLimit((#8794)
Support arena allocation of google::protobuf::AnyMetadata (#8758)
Fix undefined symbol error around SharedCtor((#8827)
Fix default value of enum(intin json_util with proto2 (#8835)
Better Smaller ByteSizeLong
Introduce event filters for inject_field_listener_events
Reduce memory usage of DescriptorPool
For lazy fields copy serialized form when allowed.
Re-introduce the InlinedStringField class
v2 access listener
Reduce padding in the proto's ExtensionRegistry map.
GetExtension performance optimizations
Make tracker a static variable rather than call static functions
Support extensions in field access listener
Annotate MergeFrom for field access listener
Fix incomplete types for field access listener
Add map_entry/new_map_entry to SpecificField in MessageDifferencer. They
record the map items which are different in MessageDifferencer's reporter.
Reduce binary size due to fieldless proto messages
TextFormat: ParseInfoTree supports getting field end location in addition to
start.
Fix repeated enum extension size in field listener
Enable Any Text Expansion for Descriptors::DebugString()
Switch from int{8,16,32,64} to int{8,16,32,64}_t
Java:
Fix errorprone conflict (#8723)
Removing deprecated TimeUtil class. (#8749)
Optimized FieldDescriptor.valueOf(to avoid array copying.
Removing deprecated TimeUtil class.
Add Durations.parseUnchecked(Stringand Timestamps.parseUnchecked(String)
FieldMaskUtil: Add convenience method to mask the fields out of a given proto.
JavaScript:
Optimize binary parsing of repeated float64
Fix for optimization when reading doubles from binary wire format
Replace toArray implementation with toJSON.
PHP:
Migrate PHP & Ruby to ABSL wyhash (#8854)
Ruby:
Move DSL implementation from C to pure Ruby (#8850)
Python:
Drops support for 2.7 and 3.5.
Other:
[csharp] ByteString.CreateCodedInput should use ArraySegment offset and count (#8740)
[ObjC] Add support for using the proto package to prefix symbols. (#8760)
field_presence.md: fix Go example (#8788)

New in Protocol Buffers 3.18.0 RC 1 (Aug 20, 2021)

C++:
Fix warnings raised by clang 11 (#8664)
Make StringPiece constructible from std::string_view (#8707)
Add missing capability attributes for LLVM 12 (#8714)
Stop using std::iterator (deprecated in C++17). (#8741)
Move field_access_listener from libprotobuf-lite to libprotobuf (#8775)
Fix #7047 Safely handle setlocale (#8735)
Remove deprecated version of SetTotalBytesLimit() (#8794)
Support arena allocation of google::protobuf::AnyMetadata (#8758)
Fix undefined symbol error around SharedCtor() (#8827)
Fix default value of enum(int) in json_util with proto2 (#8835)
Better Smaller ByteSizeLong
Introduce event filters for inject_field_listener_events
Reduce memory usage of DescriptorPool
For lazy fields copy serialized form when allowed.
Re-introduce the InlinedStringField class
v2 access listener
Reduce padding in the proto's ExtensionRegistry map.
GetExtension performance optimizations
Make tracker a static variable rather than call static functions
Support extensions in field access listener
Annotate MergeFrom for field access listener
Fix incomplete types for field access listener
Add map_entry/new_map_entry to SpecificField in MessageDifferencer. They
record the map items which are different in MessageDifferencer's reporter.
Reduce binary size due to fieldless proto messages
TextFormat: ParseInfoTree supports getting field end location in addition to
start.
Fix repeated enum extension size in field listener
Enable Any Text Expansion for Descriptors::DebugString()
Switch from int{8,16,32,64} to int{8,16,32,64}_t
Java:
Fix errorprone conflict (#8723)
Removing deprecated TimeUtil class. (#8749)
Optimized FieldDescriptor.valueOf() to avoid array copying.
Removing deprecated TimeUtil class.
Add Durations.parseUnchecked(String) and Timestamps.parseUnchecked(String)
FieldMaskUtil: Add convenience method to mask the fields out of a given proto.
JavaScript:
Optimize binary parsing of repeated float64
Fix for optimization when reading doubles from binary wire format
Replace toArray implementation with toJSON.
PHP:
Migrate PHP & Ruby to ABSL wyhash (#8854)
Ruby:
Move DSL implementation from C to pure Ruby (#8850)
Other:
[csharp] ByteString.CreateCodedInput should use ArraySegment offset and count (#8740)
[ObjC] Add support for using the proto package to prefix symbols. (#8760)
field_presence.md: fix Go example (#8788)

New in Protocol Buffers 3.17.3 (Jun 8, 2021)

New in Protocol Buffers 3.17.2 (Jun 3, 2021)

New in Protocol Buffers 3.17.1 (May 25, 2021)

New in Protocol Buffers 3.17.0 (May 13, 2021)

New in Protocol Buffers 3.17.0 RC 2 (May 11, 2021)

New in Protocol Buffers 3.17.0 RC 1 (May 8, 2021)

New in Protocol Buffers 3.16.0 (May 7, 2021)

C++:
Fix compiler warnings issue found in conformance_test_runner #8189 (#8190)
Fix MinGW-w64 build issues. (#8286)
[Protoc] C++ Resolved an issue where NO_DESTROY and CONSTINIT are in incorrect order (#8296)
Fix PROTOBUF_CONSTINIT macro redefinition (#8323)
Delete StringPiecePod (#8353)
Fix gcc error: comparison of unsigned expression in '>= 0' is always … (#8309)
Fix cmake install on iOS (#8301)
Create a CMake option to control whether or not RTTI is enabled (#8347)
Fix endian.h location on FreeBSD (#8351)
Refactor util::Status (#8354)
Make util::Status more similar to absl::Status (#8405)
Fix -Wsuggest-destructor-override for generated C++ proto classes. (#8408)
Refactor StatusOr and StringPiece (#8406)
Refactor uint128 (#8416)
The ::pb namespace is no longer exposed due to conflicts.
Allow MessageDifferencer::TreatAsSet() (and friends) to override previous
calls instead of crashing.
Reduce the size of generated proto headers for protos with string or
bytes fields.
Move arena() operation on uncommon path to out-of-line routine
For iterator-pair function parameter types, take both iterators by value.
Code-space savings and perhaps some modest performance improvements in
RepeatedPtrField.
Eliminate nullptr check from every tag parse.
Remove unused _$name$cached_byte_size fields.
Serialize extension ranges together when not broken by a proto field in the
middle.
Do out-of-line allocation and deallocation of string object in ArenaString.
Streamline ParseContext::ParseMessage to avoid code bloat and improve
performance.
New member functions RepeatedField::Assign, RepeatedPtrField::{Add, Assign}.
Fix undefined behavior warning due to innocuous uninitialization of value
on an error path.
Avoid expensive inlined code space for encoding message length for messages
= 128 bytes and instead do a procedure call to a shared out-of-line routine.
util::DefaultFieldComparator will be final in a future version of protobuf.
Subclasses should inherit from SimpleFieldComparator instead.
C#:
Add .NET 5 target and improve WriteString performance with SIMD (#8147)
Java
deps: update JUnit and Truth (#8319)
Detect invalid overflow of byteLimit and return InvalidProtocolBufferException as documented.
Exceptions thrown while reading from an InputStream in parseFrom are now
included as causes.
Support potentially more efficient proto parsing from RopeByteStrings.
Clarify runtime of ByteString.Output.toStringBuffer().
Added UnsafeByteOperations to protobuf-lite (#8426)
JavaScript:
Make Any.pack() chainable.
Python:
Fix some constness / char literal issues being found by MSVC standard conforming mode (#8344)
Switch on "new" buffer API (#8339)
Enable crosscompiling aarch64 python wheels under dockcross manylinux docker image (#8280)
Fixed a bug in text format where a trailing colon was printed for repeated field.
When TextFormat encounters a duplicate message map key, replace the current
one instead of merging.
Objective-C:
Move the class map to a CFDictionary. (#8328)
PHP:
read_property() handler is not supposed to return NULL (#8362)
Changed parameter type from long to integer (#7613)
fix: README supported PHP version for C extension (#8236)
Ruby:
Fixed quadratic memory usage when appending to arrays. (#8364)
Fixed memory leak of Ruby arena objects. (#8461)
Add support for proto3 json_name in compiler and field definitions. (#8356)
Other:
Some doc on AOT compilation and protobuf (#8294)
[CMake] Ability to pass options to protoc executable from cmake (#8374)
Add --fatal_warnings flag to treat warnings as errors (#8131)
[bazel] Remove deprecated way to depend on googletest (#8396)
add error returns missing from protoc to prevent it from exiting with… (#8409)

New in Protocol Buffers 3.16.0 RC 2 (May 6, 2021)

New in Protocol Buffers 3.15.8 (Apr 8, 2021)

New in Protocol Buffers 3.15.7 (Apr 3, 2021)

New in Protocol Buffers 3.15.6 (Mar 11, 2021)

New in Protocol Buffers 3.15.5 (Mar 5, 2021)

New in Protocol Buffers 3.15.4 (Mar 4, 2021)

New in Protocol Buffers 3.15.3 (Feb 26, 2021)

New in Protocol Buffers 3.15.2 (Feb 24, 2021)

New in Protocol Buffers 3.15.1 (Feb 20, 2021)

New in Protocol Buffers 3.15.0 (Feb 19, 2021)

Protocol Compiler:
Optional fields for proto3 are enabled by default, and no longer require the --experimental_allow_proto3_optional flag.
C++:
MessageDifferencer: fixed bug when using custom ignore with multiple unknown fields
Use init_seg in MSVC to push initialization to an earlier phase.
Runtime no longer triggers -Wsign-compare warnings.
Fixed -Wtautological-constant-out-of-range-compare warning.
DynamicCastToGenerated works for nullptr input for even if RTTI is disabled
Arena is refactored and optimized.
Clarified/specified that the exact value of Arena::SpaceAllocated() is an implementation detail users must not rely on. It should not be used in unit tests.
Change the signature of Any::PackFrom() to return false on error.
Add fast reflection getter API for strings.
Constant initialize the global message instances
Avoid potential for missed wakeup in UnknownFieldSet
Now Proto3 Oneof fields have "has" methods for checking their presence in C++.
Bugfix for NVCC
Return early in _InternalSerialize for empty maps.
Adding functionality for outputting map key values in proto path logging output (does not affect comparison logic) and stop printing 'value' in the path. The modified print functionality is in the
MessageDifferencer::StreamReporter.
Fixed #8129
Ensure that null char symbol, package and file names do not result in a crash.
Constant initialize the global message instances
Pretty print 'max' instead of numeric values in reserved ranges.
Removed remaining instances of std::is_pod, which is deprecated in C++20.
Changes to reduce code size for unknown field handling by making uncommon cases out of line.
Fix std::is_pod deprecated in C++20 (#7180)
Fix some -Wunused-parameter warnings (#8053)
Fix detecting file as directory on zOS issue #8051 (#8052)
Don't include sys/param.h for _BYTE_ORDER (#8106)
remove CMAKE_THREAD_LIBS_INIT from pkgconfig CFLAGS (#8154)
Fix TextFormatMapTest.DynamicMessage issue#5136 (#8159)
Fix for compiler warning issue#8145 (#8160)
fix: support deprecated enums for GCC < 6 (#8164)
Fix some warning when compiling with Visual Studio 2019 on x64 target (#8125)
Python:
Provided an override for the reverse() method that will reverse the internal collection directly instead of using the other methods of the BaseContainer.
MessageFactory.CreateProtoype can be overridden to customize class creation.
Fix PyUnknownFields memory leak (#7928)
Add macOS big sur compatibility (#8126)
JavaScript:
Generate getDescriptor methods with * as their this type.
Enforce let/const for generated messages.
js/binary/utils.js: Fix jspb.utils.joinUnsignedDecimalString to work with negative bitsLow and low but non-zero bitsHigh parameter. (#8170)
PHP:
Added support for PHP 8. (#8105)
unregister INI entries and fix invalid read on shutdown (#8042)
Fix PhpDoc comments for message accessors to include "|null". (#8136)
fix: convert native PHP floats to single precision (#8187)
Fixed PHP to support field numbers >=2**28. (#8235)
feat: add support for deprecated fields to PHP compiler (#8223)
Protect against stack overflow if the user derives from Message. (#8248)
Fixed clone for Message, RepeatedField, and MapField. (#8245)
Updated upb to allow nonzero offset minutes in JSON timestamps. (#8258)
Ruby:
Added support for Ruby 3. (#8184)
Rewrote the data storage layer to be based on upb_msg objects from the upb library. This should lead to much better parsing performance, particularly for large messages. (#8184).
Fill out JRuby support (#7923)
[Ruby] Fix: (SIGSEGV) gRPC-Ruby issue on Windows. memory alloc infinite recursion/run out of memory (#8195)
Fix jruby support to handle messages nested more than 1 level deep (#8194)
Java:
Avoid possible UnsupportedOperationException when using CodedInputSteam with a direct ByteBuffer.
Make Durations.comparator() and Timestamps.comparator() Serializable.
Add more detailed error information for dynamic message field type validation failure
Removed declarations of functions declared in java_names.h from java_helpers.h.
Now Proto3 Oneof fields have "has" methods for checking their presence in Java.
Annotates Java proto generated *_FIELD_NUMBER constants.
Add -assumevalues to remove JvmMemoryAccessor on Android.
C#:
Fix parsing negative Int32Value that crosses segment boundary (#8035)
Change ByteString to use memory and support unsafe create without copy (#7645)
Optimize MapField serialization by removing MessageAdapter (#8143)
Allow FileDescriptors to be parsed with extension registries (#8220)
Optimize writing small strings (#8149)

New in Protocol Buffers 3.15.0 RC2 (Feb 18, 2021)

New in Protocol Buffers 3.15.0 RC1 (Feb 10, 2021)

New in Protocol Buffers 3.14.0 (Nov 14, 2020)

Protocol Compiler:
The proto compiler no longer requires a .proto filename when it is not
generating code.
Added flag --deterministic_output to protoc --encode=....
Fixed deadlock when using google.protobuf.Any embedded in aggregate options.
C++:
Arenas are now unconditionally enabled. cc_enable_arenas no longer has
any effect.
Removed inlined string support, which is incompatible with arenas.
Fix a memory corruption bug in reflection when mixing optional and
non-optional fields.
Make SpaceUsed() calculation more thorough for map fields.
Add stack overflow protection for text format with unknown field values.
FieldPath::FollowAll() now returns a bool to signal if an out-of-bounds
error was encountered.
Performance improvements for Map.
Minor formatting fix when dumping a descriptor to .proto format with
DebugString.
UBSAN fix in RepeatedField (#2073).
When running under ASAN, skip a test that makes huge allocations.
Fixed a crash that could happen when creating more than 256 extensions in
a single message.
Fix a crash in BuildFile when passing in invalid descriptor proto.
Parser security fix when operating with CodedInputStream.
Warn against the use of AllowUnknownExtension.
Migrated to C++11 for-range loops instead of index-based loops where
possible. This fixes a lot of warnings when compiling with -Wsign-compare.
Fix segment fault for proto3 optional (#7805)
Adds a CMake option to build libprotoc separately (#7949)
Java:
Bugfix in mergeFrom() when a oneof has multiple message fields.
Fix RopeByteString.RopeInputStream.read() returning -1 when told to read
0 bytes when not at EOF.
Redefine remove(Object) on primitive repeated field Lists to avoid
autoboxing.
Support "u" escapes in textformat string literals.
Trailing empty spaces are no longer ignored for FieldMask.
Fix FieldMaskUtil.subtract to recursively remove mask.
Mark enums with @java.lang.Deprecated if the proto enum has option
deprecated = true;.
Adding forgotten duration.proto to the lite library (#7738)
Python:
Print google.protobuf.NullValue as null instead of "NULL_VALUE" when it is
used outside WKT Value/Struct.
Fix bug occurring when attempting to deep copy an enum type in python 3.
Add a setuptools extension for generating Python protobufs (#7783)
Remove uses of pkg_resources in non-namespace packages. (#7902)
[bazel/py] Omit google/init.py from the Protobuf runtime. (#7908)
Removed the unnecessary setuptools package dependency for Python package (#7511)
Fix PyUnknownFields memory leak (#7928)
PHP:
Added support for "==" to the PHP C extension (#7883)
Added == operators for Map and Array. (#7900)
Native C well-known types (#7944)
Optimized away hex2bin() call in generated code (#8006)
New version of upb, and a new hash function wyhash in third_party. (#8000)
add missing hasOneof method to check presence of oneof fields (#8003)
Go:
Update go_package options to reference google.golang.org/protobuf module.
C#:
annotate ByteString.CopyFrom(ReadOnlySpan) as SecuritySafeCritical (#7701)
Fix C# optional field reflection when there are regular fields too (#7705)
Fix parsing negative Int32Value that crosses segment boundary (#8035)
Javascript:
JS: parse (un)packed fields conditionally (#7379)

New in Protocol Buffers 3.14.0 RC 1 (Nov 6, 2020)

New in Protocol Buffers 3.13.0 (Aug 15, 2020)

New in Protocol Buffers 3.12.3 (Jun 3, 2020)

New in Protocol Buffers 3.12.2 (May 27, 2020)

New in Protocol Buffers 3.12.1 (May 21, 2020)

New in Protocol Buffers 3.12.0 (May 16, 2020)

Protocol Compiler:
[experimental] Singular, non-message typed fields in proto3 now support
presence tracking. This is enabled by adding the "optional" field label and
passing the --experimental_allow_proto3_optional flag to protoc.
For usage info, see docs/field_presence.md.
During this experimental phase, code generators should update to support
proto3 presence, see docs/implementing_proto3_presence.md for instructions.
Allow duplicate symbol names when multiple descriptor sets are passed on
the command-line, to match the behavior when multiple .proto files are passed.
Deterministic protoc --descriptor_set_out (#7175)
C++:
[experimental] Added proto3 presence support.
New descriptor APIs to support proto3 presence.
Fix for #7463 in -rc1 (core dump mixing optional and singular fields in proto3)
Enable Arenas by default on all .proto files.
Documented that users are not allowed to subclass Message or MessageLite.
Mark generated classes as final; inheriting from protos is strongly discouraged.
Add stack overflow protection for text format with unknown fields.
Add accessors for map key and value FieldDescriptors.
Add FieldMaskUtil::FromFieldNumbers().
MessageDifferencer: use ParsePartial() on Any fields so the diff does not
fail when there are missing required fields.
ReflectionOps::Merge(): lookup messages in the right factory, if it can.
Added Descriptor::WellKnownTypes enum and Descriptor::well_known_type()
accessor as an easier way of determining if a message is a Well-Known Type.
Optimized RepeatedField::Add() when it is used in a loop.
Made proto move/swap more efficient.
De-virtualize the GetArena() method in MessageLite.
Improves performance of json_stream_parser.cc by factor 1000 (#7230)
bug: #7076 undefine Windows OUT and OPTIONAL macros (#7087)
Fixed a bug in FieldDescriptor::DebugString() that would erroneously print
an "optional" label for a field in a oneof.
Fix bug in parsing bool extensions that assumed they are always 1 byte.
Fix off-by-one error in FieldOptions::ByteSize() when extensions are present.
Clarified the comments to show an example of the difference between
Descriptor::extension and DescriptorPool::FindAllExtensions.
Add a compiler option 'code_size' to force optimize_for=code_size on all
protos where this is possible.
Java:
[experimental] Added proto3 presence support.
Fix for #7480 in -rc1 ("TextFormat and JsonFormat ignore experimental proto3 optional enums")
Fix for #7505 in -rc1 (" toString() returns incorrect ascii when there are duplicate keys in a map")
Mark java enum _VALUE constants as @deprecated if the enum field is deprecated
reduce size for enums with allow_alias set to true.
Sort map fields alphabetically by the field's key when printing textproto.
TextFormat.merge() handles Any as top level type.
Throw a descriptive IllegalArgumentException when calling
getValueDescriptor() on enum special value UNRECOGNIZED instead of
ArrayIndexOutOfBoundsException.
Fixed an issue with JsonFormat.printer() where setting printingEnumsAsInts()
would override the configuration passed into includingDefaultValueFields().
Implement overrides of indexOf() and contains() on primitive lists returned
for repeated fields to avoid autoboxing the list contents.
Add overload to FieldMaskUtil.fromStringList that accepts a descriptor.
[bazel] Move Java runtime/toolchains into //java (#7190)
Python:
[experimental] Added proto3 presence support.
[experimental] fast import protobuf module, only works with cpp generated code linked in.
Truncate 'float' fields to 4 bytes of precision in setters for pure-Python
implementation (C++ extension was already doing this).
Fixed a memory leak in C++ bindings.
Added a deprecation warning when code tries to create Descriptor objects
directly.
Fix unintended comparison between bytes and string in descriptor.py.
Avoid printing excess digits for float fields in TextFormat.
Remove Python 2.5 syntax compatibility from the proto compiler generated _pb2.py module code.
Drop 3.3, 3.4 and use single version docker images for all python tests (#7396)
JavaScript:
Fix js message pivot selection (#6813)
PHP:
Persistent Descriptor Pool (#6899)
Implement lazy loading of php class for proto messages (#6911)
Correct @return in Any.unpack docblock (#7089)
Ignore unknown enum value when ignore_unknown specified (#7455)
Ruby:
[experimental] Implemented proto3 presence for Ruby. (#7406)
Stop building binary gems for ruby <2.5 (#7453)
Fix for wrappers with a zero value (#7195)
Fix for JSON serialization of 0/empty-valued wrapper types (#7198)
Call "Class#new" over rb_class_new_instance in decoding (#7352)
Build extensions for Ruby 2.7 (#7027)
assigning 'nil' to submessage should clear the field. (#7397)
C#:
[experimental] Add support for proto3 presence fields in C# (#7382)
Cleanup various bits of Google.Protobuf (#6674)
Fix conformance test failures for Google.Protobuf (#6910)
Fix latest ArgumentException for C# extensions (#6938)
Remove unnecessary branch from ReadTag (#7289)
Enforce recursion depth checking for unknown fields (#7132)
Mark GetOption API as obsolete and expose the "GetOptions()" method
on descriptors instead (#7491)
Remove Has/Clear members for C# message fields in proto2 (#7429)
Objective-C:
[experimental] ObjC Proto3 optional support (#7421)
Block subclassing of generated classes (#7124)
Use references to Obj C classes instead of names in descriptors. (#7026)
Revisit how the WKTs are bundled with ObjC. (#7173)
Other:
Add a proto_lang_toolchain for javalite (#6882)
[bazel] Update gtest and deprecate //external:{gtest,gtest_main} (#7237)
Add application note for explicit presence tracking. (#7390)
Howto doc for implementing proto3 presence in a code generator. (#7407)

New in Protocol Buffers 3.12.0 RC2 (May 13, 2020)

New in Protocol Buffers 3.12.0 RC1 (May 5, 2020)

Protocol Compiler:
[experimental] Singular, non-message typed fields in proto3 now support presence tracking. This is enabled by adding the "optional" field label and passing the --experimental_allow_proto3_optional flag to protoc.
For usage info, see docs/field_presence.md.
During this experimental phase, code generators should update to support
proto3 presence, see docs/implementing_proto3_presence.md for instructions.
Allow duplicate symbol names when multiple descriptor sets are passed on the command-line, to match the behavior when multiple .proto files are passed.
Deterministic protoc --descriptor_set_out (#7175)
C++:
[experimental] Added proto3 presence support.
New descriptor APIs to support proto3 presence.
Enable Arenas by default on all .proto files.
Documented that users are not allowed to subclass Message or MessageLite.
Mark generated classes as final; inheriting from protos is strongly discouraged.
Add stack overflow protection for text format with unknown fields.
Add accessors for map key and value FieldDescriptors.
Add FieldMaskUtil::FromFieldNumbers().
MessageDifferencer: use ParsePartial() on Any fields so the diff does not
fail when there are missing required fields.
ReflectionOps::Merge(): lookup messages in the right factory, if it can.
Added Descriptor::WellKnownTypes enum and Descriptor::well_known_type()
accessor as an easier way of determining if a message is a Well-Known Type.
Optimized RepeatedField::Add() when it is used in a loop.
Made proto move/swap more efficient.
De-virtualize the GetArena() method in MessageLite.
Improves performance of json_stream_parser.cc by factor 1000 (#7230)
bug: #7076 undefine Windows OUT and OPTIONAL macros (#7087)
Fixed a bug in FieldDescriptor::DebugString() that would erroneously print
an "optional" label for a field in a oneof.
Fix bug in parsing bool extensions that assumed they are always 1 byte.
Fix off-by-one error in FieldOptions::ByteSize() when extensions are present.
Clarified the comments to show an example of the difference between
Descriptor::extension and DescriptorPool::FindAllExtensions.
Add a compiler option 'code_size' to force optimize_for=code_size on all
protos where this is possible.
Java:
[experimental] Added proto3 presence support.
Mark java enum _VALUE constants as @deprecated if the enum field is deprecated
reduce size for enums with allow_alias set to true.
Sort map fields alphabetically by the field's key when printing textproto.
TextFormat.merge() handles Any as top level type.
Throw a descriptive IllegalArgumentException when calling
getValueDescriptor() on enum special value UNRECOGNIZED instead of
ArrayIndexOutOfBoundsException.
Fixed an issue with JsonFormat.printer() where setting printingEnumsAsInts()
would override the configuration passed into includingDefaultValueFields().
Implement overrides of indexOf() and contains() on primitive lists returned
for repeated fields to avoid autoboxing the list contents.
Add overload to FieldMaskUtil.fromStringList that accepts a descriptor.
[bazel] Move Java runtime/toolchains into //java (#7190)
Python:
[experimental] Added proto3 presence support.
[experimental] fast import protobuf module, only works with cpp generated code linked in.
Truncate 'float' fields to 4 bytes of precision in setters for pure-Python
implementation (C++ extension was already doing this).
Fixed a memory leak in C++ bindings.
Added a deprecation warning when code tries to create Descriptor objects
directly.
Fix unintended comparison between bytes and string in descriptor.py.
Avoid printing excess digits for float fields in TextFormat.
Remove Python 2.5 syntax compatibility from the proto compiler generated _pb2.py module code.
Drop 3.3, 3.4 and use single version docker images for all python tests (#7396)
JavaScript:
Fix js message pivot selection (#6813)
PHP:
Persistent Descriptor Pool (#6899)
Implement lazy loading of php class for proto messages (#6911)
Correct @return in Any.unpack docblock (#7089)
Ruby:
[experimental] Implemented proto3 presence for Ruby. (#7406)
Stop building binary gems for ruby <2.5 (#7453)
Fix for wrappers with a zero value (#7195)
Fix for JSON serialization of 0/empty-valued wrapper types (#7198)
Call "Class#new" over rb_class_new_instance in decoding (#7352)
Build extensions for Ruby 2.7 (#7027)
assigning 'nil' to submessage should clear the field. (#7397)
C#:
[experimental] Add support for proto3 presence fields in C# (#7382)
Cleanup various bits of Google.Protobuf (#6674)
Fix conformance test failures for Google.Protobuf (#6910)
Fix latest ArgumentException for C# extensions (#6938)
Remove unnecessary branch from ReadTag (#7289)
Enforce recursion depth checking for unknown fields (#7132)
Objective-C:
[experimental] ObjC Proto3 optional support (#7421)
Block subclassing of generated classes (#7124)
Use references to Obj C classes instead of names in descriptors. (#7026)
Revisit how the WKTs are bundled with ObjC. (#7173)
Other:
Add a proto_lang_toolchain for javalite (#6882)
[bazel] Update gtest and deprecate //external:{gtest,gtest_main} (#7237)
Add application note for explicit presence tracking. (#7390)
Howto doc for implementing proto3 presence in a code generator. (#7407)

New in Protocol Buffers 3.11.4 (Feb 14, 2020)

New in Protocol Buffers 3.11.3 (Feb 3, 2020)

New in Protocol Buffers 3.11.2 (Dec 14, 2019)

New in Protocol Buffers 3.11.1 (Dec 3, 2019)

New in Protocol Buffers 3.11.0 (Nov 26, 2019)

C++:
Make serialization method naming consistent
Make proto runtime + generated code free of deprecation warnings
Moved ShutdownProtobufLibrary() to message_lite.h. For backward compatibility a declaration is still available in stubs/common.h, but users should prefer message_lite.h
Removed non-namespace macro EXPECT_OK()
Removed mathlimits.h from stubs in favor of using std::numeric_limits from C++11
Fixed bug in parser when ending on a group tag
Add a helper function to UnknownFieldSet to deal with the changing return value of message::unknown_fields()
Fix incorrect use of string_view iterators
Support direct pickling of nested messages
Skip extension tag validation for MessageSet if unknown dependencies are allowed
Updated deprecation macros to annotate deprecated code (#6612)
Remove conversion warning in MapEntryFuncs::ByteSizeLong (#6766)
Revert "Make shared libraries be able to link to MSVC static runtime libraries, so that VC runtime is not required." (#6914)
Java:
Remove the usage of MethodHandle, so that Android users prior to API version 26 can use protobuf-java
Publish ProGuard config for javalite
Fix for StrictMode disk read violation in ExtensionRegistryLite
Include part of the ByteString's content in its toString().
Include unknown fields when merging proto3 messages in Java lite builders
Python:
Add float_precision option in json format printer
Optionally print bytes fields as messages in unknown fields, if possible
FieldPath: fix testing IsSet on root path ''
Experimental code gen (fast import protobuf module) which only work with cpp generated code linked in
JavaScript:
Remove guard for Symbol iterator for jspb.Map
PHP:
Avoid too much overhead in layout_init (#6716)
Lazily Create Singular Wrapper Message (#6833)
Implement lazy loading of php class for proto messages (#6911)
Ruby:
Ruby lazy wrappers optimization (#6797)
C#:
(RepeatedField): Capacity property to resize the internal array (#6530)
Experimental proto2 support is now officially available (#4642, #5183, #5350, #5936)
Getting started doc: https://github.com/protocolbuffers/protobuf/blob/master/docs/csharp/proto2.md
Add length checks to ExtensionCollection (#6759)
Optimize parsing of some primitive and wrapper types (#6843)
Use 3 parameter Encoding.GetString for default string values (#6828)
Change _Extensions property to normal body rather than expression (#6856)
Objective C:
Fixed unaligned reads for 32bit arm with newer Xcode versions (#6678)

New in Protocol Buffers 3.11.0 RC 2 (Nov 23, 2019)

New in Protocol Buffers 3.11.0 RC 1 (Nov 20, 2019)

C++:
Make serialization method naming consistent
Make proto runtime + generated code free of deprecation warnings
Moved ShutdownProtobufLibrary() to message_lite.h. For backward compatibility a declaration is still available in stubs/common.h, but users should prefer message_lite.h
Removed non-namespace macro EXPECT_OK()
Removed mathlimits.h from stubs in favor of using std::numeric_limits from C++11
Fixed bug in parser when ending on a group tag
Add a helper function to UnknownFieldSet to deal with the changing return value of message::unknown_fields()
Fix incorrect use of string_view iterators
Support direct pickling of nested messages
Skip extension tag validation for MessageSet if unknown dependencies are allowed
Updated deprecation macros to annotate deprecated code (#6612)
Remove conversion warning in MapEntryFuncs::ByteSizeLong (#6766)
Make shared libraries be able to link to MSVC static runtime libraries (#6780)
Java:
Remove the usage of MethodHandle, so that Android users prior to API version 26 can use protobuf-java
Publish ProGuard config for javalite
Fix for StrictMode disk read violation in ExtensionRegistryLite
Include part of the ByteString's content in its toString().
Include unknown fields when merging proto3 messages in Java lite builders
Python:
Add float_precision option in json format printer
Optionally print bytes fields as messages in unknown fields, if possible
FieldPath: fix testing IsSet on root path ''
Experimental code gen (fast import protobuf module) which only work with cpp generated code linked in
JavaScript:
Remove guard for Symbol iterator for jspb.Map
PHP:
Avoid too much overhead in layout_init (#6716)
Lazily Create Singular Wrapper Message (#6833)
Ruby:
Ruby lazy wrappers optimization (#6797)
C#:
RepeatedField): Capacity property to resize the internal array (#6530)
Experimental proto2 support is now officially available (#4642, #5183, #5350, #5936)
Getting started doc: https://github.com/protocolbuffers/protobuf/blob/master/docs/csharp/proto2.md
Add length checks to ExtensionCollection (#6759)
Optimize parsing of some primitive and wrapper types (#6843)
Use 3 parameter Encoding.GetString for default string values (#6828)
Change _Extensions property to normal body rather than expression (#6856)
Objective C:
Fixed unaligned reads for 32bit arm with newer Xcode versions (#6678)

New in Protocol Buffers 3.10.1 (Oct 29, 2019)

New in Protocol Buffers 3.10.0 (Oct 3, 2019)

C++:
Switch the proto parser to the faster MOMI parser.
Properly escape Struct keys in the proto3 JSON serializer.
Fix crash on uninitialized map entries.
Informed the compiler of has-bit invariant to produce better code
Unused imports of files defining descriptor extensions will now be reported
Add proto2::util::RemoveSubranges to remove multiple subranges in linear time.
Added BaseTextGenerator::GetCurrentIndentationSize()
Made implicit weak fields compatible with the Apple linker
Support 32 bit values for ProtoStreamObjectWriter to Struct.
Removed the internal-only header coded_stream_inl.h and the internal-only methods defined there.
Enforced no SWIG wrapping of descriptor_database.h (other headers already had this restriction).
Implementation of the equivalent of the MOMI parser for serialization. This removes one of the two serialization routines, by making the fast array serialization routine completely general. SerializeToCodedStream can now be implemented in terms of the much much faster array serialization. The array serialization regresses slightly, but when array serialization is not possible this wins big.
Do not convert unknown field name to snake case to accurately report error.
Fix a UBSAN warnings. (#6333)
Add podspec for C++ (#6404)
protoc: fix source code info location for missing label (#6436)
C++ Add move constructor for Reflection's SetString (#6477)
Java:
This release has a known issue on Android API level <26 (#6718)
Call loadDescriptor outside of synchronized block to remove one possible source of deadlock.
Have oneof enums implement a separate interface (other than EnumLite) for clarity.
Opensource Android Memory Accessors
Update TextFormat to make use of the new TypeRegistry.
Support getFieldBuilder and getRepeatedFieldBuilder in ExtendableBuilder
Update JsonFormat to make use of the new TypeRegistry.
Add proguard config generator for GmmBenchmarkSuiteLite.
Change ProtobufArrayList to use Object[] instead of ArrayList for 5-10% faster parsing
Implement ProtobufArrayList.add(E) for 20% (5%-40%) faster overall protolite2 parsing
Make a copy of JsonFormat.TypeRegistry at the protobuf top level package. This will eventually replace JsonFormat.TypeRegistry.
Fix javadoc warnings in generated files (#6231)
Java: Add Automatic-Module-Name entries to the Manifest (#6568)
Python:
Add descriptor methods in descriptor_pool are deprecated.
Uses explicit imports to prevent multithread test failures in py3.
Added delitem for Python extension dict
Update six version to 1.12.0 and fix legacy_create_init issue (#6391)
JavaScript:
Remove deprecated boolean option to getResultBase64String().
Fix sint64 zig-zag encoding.
Simplify hash64 string conversion to avoid DIGIT array. Should reduce overhead if these functions aren't used, and be more efficient by avoiding linear array searches.
Change the parameter types of binaryReaderFn in ExtensionFieldBinaryInfo to (number, ?, ?).
Create dates.ts and time_of_days.ts to mirror Java versions. This is a near-identical conversion of c.g.type.util.{Dates,TimeOfDays} respectively.
Migrate moneys to TypeScript.
PHP:
Fix incorrect leap day for Timestamp (#6696)
Initialize well known type values (#6713)
Ruby:
Fix scope resolution for Google namespace (#5878)
Support hashes for struct initializers (#5716)
Optimized away the creation of empty string objects. (#6502)
Roll forward Ruby upb changes now that protobuf Ruby build is fixed (#5866)
Optimized layout_mark() for Ruby (#6521)
Optimization for layout_init() (#6547)
Fix for GC of Ruby map frames. (#6533)
Fixed leap year handling by reworking upb_mktime() -> upb_timegm(). (#6695)
Objective C:
Remove OSReadLittle* due to alignment requirements (#6678)
Don't use unions and instead use memcpy for the type swaps. (#6672)
Other:
Override CocoaPods module to lowercase (#6464)

New in Protocol Buffers 3.9.2 (Sep 24, 2019)

New in Protocol Buffers 3.10.0 RC1 (Sep 6, 2019)

C++:
Switch the proto parser to the faster MOMI parser.
Properly escape Struct keys in the proto3 JSON serializer.
Fix crash on uninitialized map entries.
Informed the compiler of has-bit invariant to produce better code
Unused imports of files defining descriptor extensions will now be reported
Add proto2::util::RemoveSubranges to remove multiple subranges in linear time.
Added BaseTextGenerator::GetCurrentIndentationSize()
Made implicit weak fields compatible with the Apple linker
Support 32 bit values for ProtoStreamObjectWriter to Struct.
Removed the internal-only header coded_stream_inl.h and the internal-only methods defined there.
Enforced no SWIG wrapping of descriptor_database.h (other headers already had this restriction).
Implementation of the equivalent of the MOMI parser for serialization. This removes one of the two serialization routines, by making the fast array serialization routine completely general. SerializeToCodedStream can now be implemented in terms of the much much faster array serialization. The array serialization regresses slightly, but when array serialization is not possible this wins big.
Do not convert unknown field name to snake case to accurately report error.
Fix a UBSAN warnings. (#6333)
Add podspec for C++ (#6404)
protoc: fix source code info location for missing label (#6436)
C++ Add move constructor for Reflection's SetString (#6477)
Java:
Call loadDescriptor outside of synchronized block to remove one possible source of deadlock.
Have oneof enums implement a separate interface (other than EnumLite) for clarity.
Opensource Android Memory Accessors
Update TextFormat to make use of the new TypeRegistry.
Support getFieldBuilder and getRepeatedFieldBuilder in ExtendableBuilder
Update JsonFormat to make use of the new TypeRegistry.
Add proguard config generator for GmmBenchmarkSuiteLite.
Change ProtobufArrayList to use Object[] instead of ArrayList for 5-10% faster parsing
Implement ProtobufArrayList.add(E) for 20% (5%-40%) faster overall protolite2 parsing
Make a copy of JsonFormat.TypeRegistry at the protobuf top level package. This will eventually replace JsonFormat.TypeRegistry.
Fix javadoc warnings in generated files (#6231)
Java: Add Automatic-Module-Name entries to the Manifest (#6568)
Python:
Add descriptor methods in descriptor_pool are deprecated.
Uses explicit imports to prevent multithread test failures in py3.
Added delitem for Python extension dict
Update six version to 1.12.0 and fix legacy_create_init issue (#6391)
JavaScript:
Remove deprecated boolean option to getResultBase64String().
Fix sint64 zig-zag encoding.
Simplify hash64 string conversion to avoid DIGIT array. Should reduce overhead if these functions aren't used, and be more efficient by avoiding linear array searches.
Change the parameter types of binaryReaderFn in ExtensionFieldBinaryInfo to (number, ?, ?).
Create dates.ts and time_of_days.ts to mirror Java versions. This is a near-identical conversion of c.g.type.util.{Dates,TimeOfDays} respectively.
Migrate moneys to TypeScript.
Ruby:
Fix scope resolution for Google namespace (#5878)
Support hashes for struct initializers (#5716)
Optimized away the creation of empty string objects. (#6502)
Roll forward Ruby upb changes now that protobuf Ruby build is fixed (#5866)
Optimized layout_mark() for Ruby (#6521)
Optimization for layout_init() (#6547)
Fix for GC of Ruby map frames. (#6533)
Other:
Override CocoaPods module to lowercase (#6464)

New in Protocol Buffers 3.9.0 (Jul 12, 2019)

C++:
Optimize and simplify implementation of RepeatedPtrFieldBase
Don't create unnecessary unknown field sets.
Remove branch from accessors to repeated field element array.
Added delimited parse and serialize util.
Reduce size by not emitting constants for fieldnumbers
Fix a bug when comparing finite and infinite field values with explicit tolerances.
TextFormat::Parser should use a custom Finder to look up extensions by number if one is provided.
Add MessageLite::Utf8DebugString() to make MessageLite more compatible with Message.
Fail fast for better performance in DescriptorPool::FindExtensionByNumber() if descriptor has no defined extensions.
Adding the file name to help debug colliding extensions
Added FieldDescriptor::PrintableNameForExtension() and DescriptorPool::FindExtensionByPrintableName().
The latter will replace Reflection::FindKnownExtensionByName().
Replace NULL with nullptr
Created a new Add method in repeated field that allows adding a range of elements all at once.
Enabled enum name-to-value mapping functions for C++ lite
Avoid dynamic initialization in descriptor.proto generated code
Move stream functions to MessageLite from Message.
Move all zero_copy_stream functionality to io_lite.
Do not create array of matched fields for simple repeated fields
Enabling silent mode by default to reduce make compilation noise. (#6237)
Java:
Expose TextFormat.Printer and make it configurable. Deprecate the static methods.
Library for constructing google.protobuf.Struct and google.protobuf.Value
Make OneofDescriptor extend GenericDescriptor.
Expose streamingness of service methods from MethodDescriptor.
Fix a bug where TextFormat fails to parse Any filed with > 1 embedded message sub-fields.
Establish consistent JsonFormat behavior for nulls in oneofs, regardless of order.
Update GSON version to 3.8.5. (#6268)
Add protobuf_java_lite Bazel target. (#6177)
Python:
Change implementation of Name() for enums that allow aliases in proto2 in Python
to be in line with claims in C++ implementation (to return first value).
Explicitly say what field cannot be set when the new value fails a type check.
Duplicate register in descriptor pool will raise errors
Add slots to all well_known_types classes, custom attributes are not allowed anymore.
text_format only present 8 valid digits for float fields by default
JavaScript:
Add Oneof enum to the list of goog.provide
PHP:
Rename get/setXXXValue to get/setXXXWrapper. (#6295)
Ruby:
Remove to_hash methods. (#6166)

New in Protocol Buffers 3.8.0 (May 29, 2019)

C++:
Use std::atomic in case of myriad2 platform
Always declare enums to be int-sized
Added DebugString() and ShortDebugString() methods on MessageLite
Specialized different parse loop control flows
Make hasbits potentially in register. The or's start forming an obstacle because it's a read modify store on the same mem address on each iteration.
Move to an internal MACRO for parser validity checks.
Improve map parsing performance.
Make MergePartialFromCodedStream non virtual. This allows direct calls, potential inlining and is also a code health improvement
Add an overall limit to parse_context to prevent reading past it. This allows to remove a annoying level of indirection.
Fix a mistake, we shouldn't verify map key/value strings for utf8 in opt mode for proto2.
Further improvements to cut binary size.
Prepare to make MergePartialFromCodedStream non-virtual.
A report on some interesting behavior change in python (caused by b/27494216) made me realize there is a check that needs to be done in case the parse ended on a end group tag.
Add a note of caution to the comments around skip in CodedOutputStream.
Simplify end check.
Add overload for ParseMessage for MessageLite/Message types. If the explicit type is not known inlining won't help de-virtualizing the virtual call.
Reduce linker input. It turns out that ParseMessage is not inlined, producing template instantiations that are used only once and save nothing but cost more.
Improve the parser.
[c++17] Changed proto2::RepeatedPtrField iterators to no longer derive from the deprecated std::iterator class.
Change the default value of case_insensitive_enum_parsing to false for JsonStringToMessage.
Add a warning if a field name doesn't match the style guide.
Fix TextFormat not round-trip correctly when float value is max float.
Added locationed info for some errors at compiler
Python reserved keywords are now working with getattr()/setattr() for most descriptors.
Added AllowUnknownField() in text_format
Append '_' to C++ reserved keywords for message, enum, extension
Fix MSVC warning C4244 in protobuf's parse_context.h.
Updating Iterators to be compatible with C++17 in MSVC.
Use capability annotation in mutex.h
Fix "UndefinedBehaviorSanitizer: cfi-bad-type"
CriticalSectionLock class as a lightweight replacement for std::mutex on Windows platforms.
Removed vestigial wire_format_lite_inl.h
C#:
Added System.Memory dependency.
Java:
Make Java protoc code generator ignore optimize_for LITE_RUNTIME. Users should instead use the Java lite protoc plugin.
Change Extension getMessageDefaultInstance() to return Message instead of MessageLite.
Prevent malicious input streams from leaking buffers for ByteString or ByteBuffer parsing.
Release new Javalite runtime.
Show warning in case potential file name conflict.
Allow Java reserved keywords to be used in extensions.
Added setAllowUnknownFields() in text format
Add memoization to ExtensionRegistryLite.getEmptyRegistry()
Improve performance of CodedOutputStream.writeUInt32NoTag
Add an optimized mismatch-finding algorithm to UnsafeUtil.
When serializing uint32 varints, check that we have MAX_VARINT32_SIZE bytes left, not just MAX_VARINT_SIZE.
Minor optimization to RopeByteString.PieceIterator
JavaScript:
Simplify generated toObject code when the default value is used.
Python:
Changes implementation of Name() for enums that allow aliases in proto2 in Python to be in line with claims in C++ implementation (to return first value).
Added double_format option in text format printer.
Added iter and contains to extension dict
Added allow_unknown_field option in python text format parser
Fixed Timestamp.ToDatetime() loses precision issue
Support unknown field in text format printer.
Float field will be convert to inf if bigger than struct.unpack('f', b'xffxffx7fx7f')[0] which is about 3.4028234664e+38,
convert to -inf if smaller than -3.4028234664e+38
Allowed casting str->bytes in Message.setstate
Ruby:
Helper methods to get enum name for Ruby.

New in Protocol Buffers 3.7.1 (Mar 28, 2019)

New in Protocol Buffers 3.7.0 RC3 (Feb 25, 2019)

New in Protocol Buffers 3.7.0 RC2 (Feb 5, 2019)

New in Protocol Buffers 3.7.0 RC1 (Jan 31, 2019)

New in Protocol Buffers 3.6.1 (Jan 14, 2019)

New in Protocol Buffers 2.5.0 (Mar 10, 2013)

New in Protocol Buffers 2.4.1 (Feb 4, 2012)

New in Protocol Buffers 2.4.0 (Feb 4, 2012)

General:
The RPC (cc|java|py)_generic_services default value is now false instead of
true
Custom options can have aggregate types. For example
message MyOption {
optional string comment = 1
optional string author = 2
extend google.protobuf.FieldOptions {
optional MyOption myoption = 12345
This option can now be set as follows
message SomeType {
optional int32 field = 1 [(myoption) = { comment:'x' author:'y' }]
C++:
Various speed and code size optimizations
Added a release_foo() method on string and message fields
Fixed gzip_output_stream sub-stream handling
Java:
Builders now maintain sub-builders for sub-messages. Use getFooBuilder() to
get the builder for the sub-message "foo". This allows you to repeatedly
modify deeply-nested sub-messages without rebuilding them
Builder.build() no longer invalidates the Builder for generated messages
You may continue to modify it and then build another message)
Code generator will generate efficient equals() and hashCode()
implementations if new option java_generate_equals_and_hash is enabled
Otherwise, reflection-based implementations are used.)
Generated messages now implement Serializable
Fields with [deprecated=true] will be marked with @Deprecated in Java
Added lazy conversion of UTF-8 encoded strings to String objects to improve
performance
Various optimizations
Enum value can be accessed directly, instead of calling getNumber() on the
enum member
For each enum value, an integer constant is also generated with the suffix
VALUE
Python:
Added an experimental C++ implementation for Python messages via a Python
extension. Implementation type is controlled by an environment variable
PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION (valid values: "cpp" and "python")
The default value is currently "python" but will be changed to "cpp" in
future release
Improved performance on message instantiation significantly
Most of the work on message instantiation is done just once per message
class, instead of once per message instance
Improved performance on text message parsing
Allow add() to forward keyword arguments to the concrete class
E.g. instead of
item = repeated_field.add()
item.foo = bar
item.baz = quux
You can do
repeated_field.add(foo=bar, baz=quux)
Added a sort() interface to the BaseContainer
Added an extend() method to repeated composite fields
Added UTF8 debug string support

New in Protocol Buffers 2.3.0 (Mar 12, 2010)

General:
Parsers for repeated numeric fields now always accept both packed and unpacked input. The [packed=true] option only affects serializers. Therefore, it is possible to switch a field to packed format without breaking backwards-compatibility -- as long as all parties are using protobuf 2.3.0 or above, at least.
The generic RPC service code generated by the C++, Java, and Python generators can be disabled via file options:
option cc_generic_services = false;
option java_generic_services = false;
option py_generic_services = false;
This allows plugins to generate alternative code, possibly specific to some particular RPC implementation.
protoc:
Now supports a plugin system for code generators. Plugins can generate code for new languages or inject additional code into the output of other code generators. Plugins are just binaries which accept a protocol buffer on stdin and write a protocol buffer to stdout, so they may be written in any language. See src/google/protobuf/compiler/plugin.proto.
If the output location ends in .zip or .jar, protoc will write its output to a zip/jar archive instead of a directory. For example: protoc --java_out=myproto_srcs.jar --python_out=myproto.zip myproto.proto. Currently the archive contents are not compressed, though this could change in the future. inf, -inf, and nan can now be used as default values for float and double fields.
C++:
Various speed and code size optimizations.
DynamicMessageFactory is now fully thread-safe.
Message::Utf8DebugString() method is like DebugString() but avoids escaping UTF-8 bytes.
Compiled-in message types can now contain dynamic extensions, through use of CodedInputStream::SetExtensionRegistry().
Now compiles shared libraries (DLLs) by default on Cygwin and MinGW, to match other platforms. Use --disable-shared to avoid this.
Java:
parseDelimitedFrom() and mergeDelimitedFrom() now detect EOF and return false/null instead of throwing an exception.
Fixed some initialization ordering bugs.
Fixes for OpenJDK 7.
Python:
10-25 times faster than 2.2.0, still pure-Python.
Calling a mutating method on a sub-message always instantiates the message in its parent even if the mutating method doesn't actually mutate anything (e.g. parsing from an empty string).
Expanded descriptors a bit.