[Python-Dev] Wordcode: new regular bytecode using 16-bit units

Victor Stinner victor.stinner at gmail.com
Thu Apr 14 08:02:55 EDT 2016

Le jeudi 14 avril 2016, Nick Coghlan <ncoghlan at gmail.com> a écrit :
> > IHMO it's not a big deal to update these projects for the future
> > Python 3.6. I can even help them to support the new bytecode format.
> We've also had previous discussions on adding a "minimum viable
> bytecode editing" API to the standard library, and updating these
> third party modules to support wordcode instead of bytecode could
> provide a good use-case-driven opportunity for defining that (i.e. it
> wouldn't be about providing an end user facing API directly, but
> rather about letting CPython take care of the bookkeeping details for
> things like lnotab and sorting out jump targets).

Yeah, I know well this discussion since it started with my PEP 511. I
wrote the bytecode as a tool for the discussion, to try to understand
better the use case. The main task was to design the API.

I first looked at byteplay and codetranformer projects, but I found
some issues in their design. Their API has some design issues. IMHO
their API is not the best to modify bytecode.

My goal is to support Bytecode.from_code(code).to_code()==code: store
enough information to be able to emit again exactly the same bytecode
(line numbers, exact argument value, etc.).

I started with a long email, but I decided to document differences in
bytecode documentation:


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