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
A couple weeks ago we moved upb into the protobuf Git repo, and this change
continues the merger of the two repos by making them into a single Bazel repo.
This was mostly a matter of deleting upb's WORKSPACE file and fixing up a bunch
of references to reflect the new structure.
Most of the changes are pretty mechanical, but one thing that needed more
invasive changes was the Python script for generating CMakeLists.txt,
make_cmakelists.py. The WORKSPACE file it relied on no longer exists with this
change, so I updated it to hardcode the information it needed from that file.
PiperOrigin-RevId: 564810016
This is the second attempt to fix our Git history. This should allow
"git blame" to work correctly in the upb/ directory even though our
automation unexpectedly blew away that directory.
I added two variants, one which is unbalanced (always fusing a single arena into the group) while the other is balanced (always fusing two groups of equal size).
Unfortunately it is difficult to benchmark `upb_Arena_Free()` separately from fuse, since the only way to get a non-zero refcount is to fuse.
Results on my machine:
```
CPU: Intel Skylake Xeon with HyperThreading (48 cores) dL1:32KB dL2:1024KB dL3:38MB
Benchmark Time(ns) CPU(ns) Iterations
-------------------------------------------------------------------
BM_ArenaFuseUnbalanced/2 52.2 52.2 1000000 38.300M items/s
BM_ArenaFuseUnbalanced/8 416 416 142315 19.243M items/s
BM_ArenaFuseUnbalanced/64 4034 4033 14306 15.868M items/s
BM_ArenaFuseUnbalanced/128 8302 8301 6837 15.420M items/s
BM_ArenaFuseBalanced/2 54.7 54.7 1000000 36.581M items/s
BM_ArenaFuseBalanced/8 425 425 100000 18.845M items/s
BM_ArenaFuseBalanced/64 4029 4029 14632 15.886M items/s
BM_ArenaFuseBalanced/128 8050 8049 7176 15.902M items/s
```
PiperOrigin-RevId: 518292073
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
Protobuf Team Bot
Adam Cozzette
Eric Salo
Joshua Haberman
Mike Kruskal
Joshua Haberman