Honestly I think the API for accessing historic pyc headers should itself also be 3rd party. CPython itself should not bother (backwards compatibility with pyc files has never been a feature).
On Thu, Oct 5, 2017 at 6:44 AM, Barry Warsaw <ba...@python.org> wrote: > On Oct 4, 2017, at 13:53, Benjamin Peterson <benja...@python.org> wrote: > > > It might be helpful to enumerate the usecases for such an API. Perhaps a > > narrow, specialized API could satisfy most needs in a supportable way. > > Currently `python -m dis thing.py` compiles the source then disassembles > it. It would be kind of cool if you could pass a .pyc file to -m dis, in > which case you’d need to unpack the header to get to the code object. A > naive implementation would unpack the magic number and refuse to > disassemble any files that don’t match whatever that version of Python > understands. A more robust (possibly 3rd party) implementation could > potentially disassemble a range of magic numbers and formats, and an API to > get at the code object and metadata would help. > > I was thinking about the bytecode hacking that some debuggers do. This > API would help them support multiple versions of Python. They could use > the API to discover what pyc format was in use, extract the code object, > hack the bytecode and possibly rewrite a new PEP 3147 style pyc file with > the debugger bytecodes inserted. > > Third party bytecode optimizers could use the API to unpack multiple > versions of pyc files, do their optimizations, and rewrite new files with > the proper format. > > Cheers, > -Barry > > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: https://mail.python.org/mailman/options/python-dev/ > guido%40python.org > > -- --Guido van Rossum (python.org/~guido)
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