<div dir="ltr">I know Kushal set up ABI testing for Fedora and has brought up taking the work he did for that and bringing it over to CPython, but I also know he is offline for personal reasons ATM and won't be able to to reply for a little while.<br></div><br><div class="gmail_quote"><div dir="ltr">On Mon, 4 Jun 2018 at 08:06 Eric Snow <<a href="mailto:ericsnowcurrently@gmail.com">ericsnowcurrently@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I've pointed out in bpo-21142 the similar script I added last year to<br>
track C globals:<br>
<br>
 <a href="https://github.com/python/cpython/tree/master/Tools/c-globals" rel="noreferrer" target="_blank">https://github.com/python/cpython/tree/master/Tools/c-globals</a><br>
<br>
-eric<br>
<br>
On Mon, Jun 4, 2018 at 1:17 AM, Ronald Oussoren <<a href="mailto:ronaldoussoren@mac.com" target="_blank">ronaldoussoren@mac.com</a>> wrote:<br>
><br>
><br>
> On 4 Jun 2018, at 08:35, Ronald Oussoren <<a href="mailto:ronaldoussoren@mac.com" target="_blank">ronaldoussoren@mac.com</a>> wrote:<br>
><br>
><br>
><br>
> On 3 Jun 2018, at 17:04, Eric V. Smith <<a href="mailto:eric@trueblade.com" target="_blank">eric@trueblade.com</a>> wrote:<br>
><br>
> On 6/3/2018 10:55 AM, Christian Tismer wrote:<br>
><br>
> On 03.06.18 13:18, Ronald Oussoren wrote:<br>
><br>
><br>
><br>
> On 3 Jun 2018, at 12:03, Christian Tismer <<a href="mailto:tismer@stackless.com" target="_blank">tismer@stackless.com</a>> wrote:<br>
><br>
> ...<br>
><br>
><br>
> I have written a script that scans all relevant header files<br>
> and analyses all sections which are reachable in the limited API<br>
> context.<br>
> All macros that don't begin with an underscore which contain<br>
> a "->tp_" string are the locations which will break.<br>
><br>
> I found exactly 7 locations where this is the case.<br>
><br>
> My PR will contain the 7 fixes plus the analysis script<br>
> to go into tools. Preparind that in the evening.<br>
><br>
><br>
> Having tests would still be nice to detect changes to the stable ABI when<br>
> they are made.<br>
><br>
> Writing those tests is quite some work though, especially if those at least<br>
> smoke test the limited ABI by compiling snippets the use all symbols that<br>
> should be exposed by the limited ABI. Writing those tests should be fairly<br>
> simple for someone that knows how to write C extensions, but is some work.<br>
><br>
> Writing a tests that complain when the headers expose symbols that shouldn’t<br>
> be exposed is harder, due to the need to parse headers (either by hacking<br>
> something together using regular expressions, or by using tools like gccxml<br>
> or clang’s C API).<br>
><br>
> What do you mean?<br>
> My script does that with all "tp_*" type fields.<br>
> What else would you want to check?<br>
><br>
><br>
> I think Ronald is saying we're trying to answer a few questions:<br>
><br>
> 1. Did we accidentally drop anything from the stable ABI?<br>
><br>
> 2. Did we add anything to the stable ABI that we didn't mean to?<br>
><br>
> 3. (and one of mine): Does the stable ABI already contain things that we<br>
> don't expect it to?<br>
><br>
><br>
> That’s correct. There have been instances of the second item over the year,<br>
> and not all of them have been caught before releases. What doesn’t help for<br>
> all of these is that the stable ABI documentation says that every documented<br>
> symbol is part of the stable ABI unless there’s explicit documentation to<br>
> the contrary. This makes researching if functions are intended to be part of<br>
> the stable ABI harder.<br>
><br>
> And also:<br>
><br>
> 4. Does the stable ABI actually work?<br>
><br>
> Christian’s script finds cases where exposed names don’t actually work when<br>
> you try to use them.<br>
><br>
><br>
> To reply to myself, the gist below is a very crude version of what I was<br>
> trying to suggest:<br>
><br>
> <a href="https://gist.github.com/ronaldoussoren/fe4f80351a7ee72c245025df7b2ef1ed#file-gistfile1-txt" rel="noreferrer" target="_blank">https://gist.github.com/ronaldoussoren/fe4f80351a7ee72c245025df7b2ef1ed#file-gistfile1-txt</a><br>
><br>
> The gist is far from usable, but shows some tests that check that symbols in<br>
> the stable ABI can be used, and tests that everything exported in the stable<br>
> ABI is actually tested.<br>
><br>
> Again, the code in the gist is a crude hack and I have currently no plans to<br>
> turn this into something that could be added to the testsuite.<br>
><br>
> Ronald<br>
><br>
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</blockquote></div>