Method ReadValue

tensorflow/core/kernels/decode_proto_op.cc:490–505

Reads a value from the input stream and stores it. Always inlining gave a ~50% speedup on microbenchmarks at one point. TODO(nix): try removing it to see if that still holds. TODO(jsimsa): ABSL_ATTRIBUTE_ALWAYS_INLINE

  // TODO(nix): try removing it to see if that still holds.
  // TODO(jsimsa): ABSL_ATTRIBUTE_ALWAYS_INLINE
  Status ReadValue(CodedInputStream* input, const FieldInfo& field) {
    // For required and optional fields, we overwrite values[0] with
    // the latest one in the wire stream.
    // See https://developers.google.com/protocol-buffers/docs/encoding#optional
    // Only for repeated fields do we advance the next_repeat_index_ past 1.
    // TODO(nix): to handle oneof we must also zero out any previous values
    //  seen on the wire.
    int32 index = 0;
    if (field.is_repeated) {
      index = next_repeat_index_;
    }
    next_repeat_index_ = index + 1;

    return internal::ReadValue(input, field.type, field.number,
                               default_value_.dtype, index, datap_);
  }

  // Reads and stores a length-delimited list of values.
  Status ReadPackedValues(CodedInputStream* input, const FieldInfo& field,