protobuf v3.8.0-rc1 Release Notes

Release Date: 2019-05-01 // almost 5 years ago
  • C++

    • ๐Ÿ‘‰ Use std::atomic in case of myriad2 platform
    • Always declare enums to be int-sized
    • โž• Added DebugString() and ShortDebugString() methods on MessageLite
    • ๐Ÿ“œ Specialized different parse loop control flows
    • ๐Ÿ‘‰ 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.
    • ๐Ÿšš Move to an internal MACRO for parser validity checks.
    • ๐Ÿ‘Œ Improve map parsing performance.
    • ๐Ÿ”€ Make MergePartialFromCodedStream non virtual. This allows direct calls, potential inlining and is also a code health improvement
    • โž• Add an overall limit to parse_context to prevent reading past it. This allows to remove a annoying level of indirection.
    • ๐Ÿ›  Fix a mistake, we shouldn't verify map key/value strings for utf8 in opt mode for proto2.
    • Further improvements to cut binary size.
    • ๐Ÿ”€ Prepare to make MergePartialFromCodedStream non-virtual.
    • ๐Ÿ“œ 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.
    • โž• Add a note of caution to the comments around skip in CodedOutputStream.
    • Simplify end check.
    • โž• Add overload for ParseMessage for MessageLite/Message types. If the explicit type is not known inlining won't help de-virtualizing the virtual call.
    • โฌ‡๏ธ 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.
    • ๐Ÿ‘Œ Improve the parser.
    • ๐Ÿ—„ [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.
    • โž• Add a warning if a field name doesn't match the style guide.
    • ๐Ÿ›  Fix TextFormat not round-trip correctly when float value is max float.
    • โž• Added locationed info for some errors at compiler
    • Python reserved keywords are now working with getattr()/setattr() for most descriptors.
    • โž• Added AllowUnknownField() in text_format
    • Append '_' to C++ reserved keywords for message, enum, extension
    • ๐Ÿ›  Fix MSVC warning C4244 in protobuf's parse_context.h.
    • โšก๏ธ Updating Iterators to be compatible with C++17 in MSVC.
    • ๐Ÿ‘‰ Use capability annotation in mutex.h
    • ๐Ÿ›  Fix "UndefinedBehaviorSanitizer: cfi-bad-type"
    • ๐Ÿš‘ CriticalSectionLock class as a lightweight replacement for std::mutex on Windows platforms.
    • Removed vestigial wire_format_lite_inl.h

    C

    • โž• Added System.Memory dependency.

    Java

    • Make Java protoc code generator ignore optimize_for LITE_RUNTIME. Users should instead use the Java lite protoc plugin.
    • ๐Ÿ”„ Change Extension getMessageDefaultInstance() to return Message instead of MessageLite.
    • โœ… Prevent malicious input streams from leaking buffers for ByteString or ByteBuffer parsing.
    • ๐Ÿš€ Release new Javalite runtime.
    • โš  Show warning in case potential file name conflict.
    • ๐Ÿ‘ Allow Java reserved keywords to be used in extensions.
    • โž• Added setAllowUnknownFields() in text format
    • โž• Add memoization to ExtensionRegistryLite.getEmptyRegistry()
    • ๐Ÿ‘Œ Improve performance of CodedOutputStream.writeUInt32NoTag
    • โž• 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.
    • โœ… Minor optimization to RopeByteString.PieceIterator

    JavaScript

    • 0๏ธโƒฃ Simplify generated toObject code when the default value is used.

    Python

    • ๐Ÿ”„ 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).
    • โž• 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
    • ๐Ÿ›  Fixed Timestamp.ToDatetime() loses precision issue
    • ๐Ÿ‘Œ Support unknown field in text format printer.
    • Float field will be convert to inf if bigger than struct.unpack('f', b'\xff\xff\x7f\x7f')[0] which is about 3.4028234664e+38,
      convert to -inf if smaller than -3.4028234664e+38
    • Allowed casting str->bytes in Message. setstate

    ๐Ÿ’Ž Ruby

    • ๐Ÿ’Ž Helper methods to get enum name for Ruby.