This makes third_party/utf8_range no longer a Git subtree, but instead the
permanent location and source of truth for utf8_range. It is also now
incorporated into the @com_google_protobuf Bazel repo. Utf8_range still has its
own separate CMake build for now, though.
PiperOrigin-RevId: 580682733
This change moves almost everything in the `upb/` directory up one level, so
that for example `upb/upb/generated_code_support.h` becomes just
`upb/generated_code_support.h`. The only exceptions I made to this were that I
left `upb/cmake` and `upb/BUILD` where they are, mostly because that avoids
conflict with other files and the current locations seem reasonable for now.
The `python/` directory is a little bit of a challenge because we had to merge
the existing directory there with `upb/python/`. I made `upb/python/BUILD` into
the BUILD file for the merged directory, and it effectively loads the contents
of the other BUILD file via `python/build_targets.bzl`, but I plan to clean
this up soon.
PiperOrigin-RevId: 568651768
For LITE messages we append the type name to the data, avoiding an
indirection and a relocation.
For descriptor messages we mark them as such and have a secondary vtable. This
way we avoid having to put those pointers on each message ClassData. We save in
data size and relocations. If in the future we determine that the extra jump is
costly we can inline the relevant descriptor method pointers into `ClassData`.
PiperOrigin-RevId: 565775188
Protobuf Team Bot
Adam Cozzette
Eric Salo
Mike Kruskal
Thomas Van Lenten
Protobuf Team Bot