gh-103583: Isolate CJK codec modules by erlend-aasland · Pull Request #103869 · python/cpython

• Issue: Isolate _multibytecodec #103583

This approach exploits the dependency introduced in gh-103589; we know for sure that the _codec* extension modules will outlive _multibytecodec. This means we can store the cjk codec module state safely in the codec struct and modify the various codec handlers to accept the codec struct (iso. void *config). Then we add custom cjk module state where needed, and conveniently fetch it from the codec struct. (Quick and dirty explanation; see the code if what I wrote does not make sense 😎)

🤖 New build scheduled with the buildbot fleet by @erlend-aasland for commit ef983c4 🤖

If you want to schedule another build, you need to add the 🔨 test-with-refleak-buildbots label again.

BTW, I removed the initialized guards. I'm pretty sure we can do that, but I haven't verified it yet.

Also, we can split out cb2c9e7 as a separate PR. That may be beneficial regarding to future bisects; it will also make this PR easier to review.

Similarly, f6ed5df can be split up to do the arg spec changes first, and then move stuff to module state afterwards.

(Pulling in main to get the latest ref. leak fixes by Jelle)

🤖 New build scheduled with the buildbot fleet by @erlend-aasland for commit dec79a7 🤖

If you want to schedule another build, you need to add the 🔨 test-with-refleak-buildbots label again.

Thanks for the review, Dong-hee! Yes, it is complicated, but as shown in my competing PRs, other approaches are even more complicated.