> On 19 Jan 2021, at 17:15, Antoine Pitrou <anto...@python.org> wrote: > > On Tue, 19 Jan 2021 15:54:39 +0000 > Mark Shannon <m...@hotpy.org <mailto:m...@hotpy.org>> wrote: >> On 19/01/2021 3:40 pm, Antoine Pitrou wrote: >>> On Tue, 19 Jan 2021 13:31:45 +0000 >>> Mark Shannon <m...@hotpy.org> wrote: >>>> Hi everyone, >>>> >>>> It's time for yet another PEP :) >>>> >>>> Fortunately, this one is a small one that doesn't change much. >>>> It's aim is to make the VM more robust. >>> >>> On the principle, no objection. >>> >>> In practice, can you show how an implementation of Py_CheckStackDepth() >>> would look like? >> >> It would depend on the platform, but a portable-ish implementation is here: >> >> https://github.com/markshannon/cpython/blob/pep-overflow-implementation/Include/internal/pycore_ceval.h#L71 > > This doesn't tell me how `stack_limit_pointer` is computed or estimated > :-)
There already is an implementation of this for Windows (``PyOS_CheckStack``). For other platforms there will have to be a different implementation of this function. I’ve looked into this in the past for macOS, and that platform has an API to retrieve the size of the stack as well as a pointer to the start of the stack (AFAIK stacks aren’t auto-growing on macOS) Ronald — Twitter / micro.blog: @ronaldoussoren Blog: https://blog.ronaldoussoren.net/
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