Hi Guido,
On 22/01/2021 5:20 am, Guido van Rossum wrote:
On Wed, Jan 20, 2021 at 9:16 AM Mark Shannon <m...@hotpy.org
<mailto:m...@hotpy.org>> wrote:
I've updated the PEP in light of my experiments and feedback.
The new API is simpler and a bit more backwards compatible.
https://www.python.org/dev/peps/pep-0651
<https://www.python.org/dev/peps/pep-0651/>
Minor question: what's the `where` argument to `Py_CheckStackDepth()` for?
The same as for Py_EnterRecursiveCall(where); it gets incorporated into
the exception message.
The implementation section doesn't mention how you intend to avoid the C
stack for Python-to-Python calls. I have some idea, but it would be nice
if you explained this a bit more. (I'm guessing you are planning to move
some state from local variables into the frame object, store a "return
location" (really frame object + bytecode program counter) somewhere,
and then jump to the top of `_PyEval_EvalFrameDefault()`, or at least
somewhere near the top. Of course this requires adjusting the various
`CALL_*` opcodes to check whether the target is a Python function or
not. On `RETURN_VALUE` you reverse the process, but only if the call
came from the previous mechanism. Do I get a lollipop? :-)
Yes you do. š
I'll expand the PEP a bit to include that information.
I'm guessing you needn't do anything for generators -- IIRC recursion
through `next()` is not possible, since an active generator cannot be
entered recursively.
Yes.
It might be nice to handle generators as well, but it is not necessary.
Cheers,
Mark.
--
--Guido van Rossum (python.org/~guido <http://python.org/~guido>)
/Pronouns: he/him //(why is my pronounĀ here?)/
<http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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