bpo-41861: Convert sqlite3 to PEP 384

[erlend-aasland]

TODO:

• Fix Cursor type leaks references
• Fix Connection type leaks references

@berkerpeksag or @vstinner, could you point me in the right direction regarding solving the ref. leaks? I've been testing using python.exe -m test -F -r -j1 -R 3:10 test_sqlite.

https://www.python.org/dev/peps/pep-0384/

First step of converting sqlite3 to multi-phase init. AFAICS, the next step would be dynamic state.

https://bugs.python.org/issue41861

[vstinner]

Sorry, but this PR is too large to be easily reviewed.

It seems like the PR converts static types to heap types. Can you try to write a first PR which only modify a few files and convert few types (ex: 3), which would be easier to review?

Please don't propose multiple PRs in parallel, since conflicts in PyInit__sqlite3() are likely.

For example, starting by only converting cache types:

extern PyTypeObject pysqlite_NodeType;
extern PyTypeObject pysqlite_CacheType;

[erlend-aasland]

Sorry, but this PR is too large to be easily reviewed.

It seems like the PR converts static types to heap types. Can you try to write a first PR which only modify a few files and convert few types (ex: 3), which would be easier to review?

Of course. I'll remove the two problematic commits and create a new PR. Thanks!

Please don't propose multiple PRs in parallel, since conflicts in PyInit__sqlite3() are likely.

Acknowledged.