Proto3 optional fields should use a hasbit for their presence. But we had been giving them oneof layouts, which makes them unnecessarily large. This CL will shrink messages with proto3 optional fields, by using hasbits instead of oneof cases for them.
PiperOrigin-RevId: 485998527
Once the GitHub action is fixed, these will be auto-updated whenever
necessary. I realized it would be a good idea to add them back first,
though, just to make sure nothing breaks before we enable the
auto-updating.
We need to sharpen the distinction between messages and extensions in the mini
descriptor encoder, so split the code paths for each.
PiperOrigin-RevId: 480675339
- upb_DefPool_FindExtensionByMiniTable() has been promoted to a public function.
- There are now zero uses of the internal reflection headers outside of upb core (but still a few left in generated code).
PiperOrigin-RevId: 480211522
We had _upb_Message_New(), which created a message from a mini table and was
being used outside of upb even though it is an internal-only function.
We also had upb_Message_New(), which created a message from a message def.
Now there is a single public function, upb_Message_New(), which creates a
message from a mini table and covers all use cases. (The internal version has the same definition and is used for inlining.)
PiperOrigin-RevId: 480169804
Prior to this CL, users were relying on `field->descriptortype` to get the field type. This almost works, as `field->descriptortype` is almost, but not quite, the field type of the field. In two special cases we deviate from the true field type, for ease of parsing and serialization:
- For open enums, we use `kUpb_FieldType_Int32` instead of `kUpb_FieldType_Enum`, because from the perspective of the wire format, an open enum field is equivalent to int32.
- For proto2 strings, we use `kUpb_FieldType_Bytes` instead of `kUpb_FieldType_String`, because proto2 strings do not perform UTF-8 validation, which makes them equivalent to bytes.
In this CL we add a public API function:
```
// Returns the true field type for this field.
upb_FieldType upb_MiniTableField_Type(const upb_MiniTable_Field* f);
```
This will provide the actual field type for this field.
Note that this CL changes the MiniDescriptor format. Previously MiniDescriptors did not contain enough information to distinguish between Enum/Int32. To remedy this we added a new encoded field type, `kUpb_EncodedType_ClosedEnum`.
PiperOrigin-RevId: 479387672
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Jie Luo
Eric Salo
Joshua Haberman
Joshua Haberman
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