cfbolz changed the topic of #pypy to: PyPy, the flexible snake (IRC logs: https://quodlibet.duckdns.org/irc/pypy/latest.log.html#irc-end ) | use cffi for calling C | if a pep adds a mere 25-30 [C-API] functions or so, it's a drop in the ocean (cough) - Armin
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* arigo
debugs completely impossible problems
<arigo>
aaaah got it. you just have to complain about it after 30 minutes and it becomes obvious
<mattip>
:)
<arigo>
time to revert all these debug prints that were never printing anything
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<arigo>
I'll categorize 'hypothesis' as something "maybe great but lots of work to get started"
<arigo>
I've got a segfault in cffi on linux now
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<mattip>
hypothesis is great for testing something like strings or complex numbers
<mattip>
but it seems trying to generalize it to other things get quickly harder than just pytest.paramtrize
<arigo>
on the other hand, the current segfault seems to occur only for a very complicated function signature
<arigo>
no, it seems we get a crash if we call via libffi a function that returns a struct, and the struct contains an "unsigned char" followed by a "long double"
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<cfbolz>
arigo: if you debug a segfault with hypothesis there is a hack to make it still successfully shrink the failing test case
<cfbolz>
running the segfaulting part in a subprocess to turn it into a regular failure for hypothesis
<cfbolz>
then it'll happily minimize the problem
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<Hodgestar>
cfbolz: That is a pretty awesome feature.
<cfbolz>
I used it a lot to minimize segfaults in a c library I wrote last year, tested with cffi, pytest + hypothesis
<cfbolz>
Maybe I should blog about that
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