[Python-Dev] C-API functions for reading/writing tstate->exc_* ? (original) (raw)

Stefan Behnel stefan_ml at behnel.de
Sun Feb 19 22:10:50 CET 2012

Nick Coghlan, 19.02.2012 15:31:

On Mon, Feb 20, 2012 at 12:18 AM, Paul Moore wrote:

Of course, you could always go through the Python API, getting the sys module, extracting the relevant functions and calling them using the abstract API. That's what I'd recommend if this were purely a CPython question. But I assume that (for some reason) that's not appropriate for PyPy. I had the same thought, but it actually only works cleanly for the "fetch" half of the equation. You'd have to muck around with actually raising an exception to handle setting those fields, which is really relying on implementation details). That said, it may be worth further exploring the idea of invoking appropriate snippets of Python code to get the desired effect.

Actually, we currently inline the straight C code for this in CPython for performance reasons, so, no, going through Python code isn't going to be a good idea.

My other question would be whether there's an existing private C API with the desired behaviour that could be made public, or if this would be a genuinely new addition to the API.

I'm not aware of any. The code in CPython (especially in ceval.c) always uses direct field access.

Stefan

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