[Issue 8] ARM: runnable/arrayop.d fails: Wrong execution order

[gdc-bugzilla at gdcproject.org]

http://gdcproject.org/bugzilla/show_bug.cgi?id=8

Alex Rønne Petersen <alex at lycus.org> changed:

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                 CC|                            |alex at lycus.org

--- Comment #3 from Alex Rønne Petersen <alex at lycus.org> 2012-09-26 08:03:04 UTC ---
Just leaving some IRC logs here to record my opinion on the matter:

20:52:37 < Zor> ibuclaw: in my opinion, the language should make strong
guarantees about this stuff that compilers must
                follow, regardless of arch quirks
20:53:05 < ibuclaw> extern(D) makes strong guarantees.
20:53:28 < ibuclaw> extern(C) doesn't, which is why the testcase is fairly
bogus.
20:55:44 < Zor> ibuclaw: I don't see why the compiler can't make the same
guarantees about extern (C) functions too
20:56:48 < Zor> ibuclaw: the compiler would have to do some extra work to
ensure LTR evaluation order, but that
                shouldn't be impossible
20:58:08 < Zor> ibuclaw: I especially think it's worth looking into because
there's nothing even mentioning C
                linkage/ABI in this piece of D code, which makes the gotcha
even more ridiculous
20:58:57 < ibuclaw> Zor, the problem is there would be code out there that
relies on the already existing behaviour,
                    sadly enough.
20:59:28 < Zor> yes, but there's no point in caring about that
20:59:41 < Zor> TDPL says left-to-right, always
20:59:53 < Zor> it'll break code, but we need to clean up the mess sooner
rather than later
21:00:51 < ibuclaw> Zor, does it explicitly say 'all functions, even extern(C)'
? :^)
21:01:34 < Zor> All arguments are evaluated left to right
21:01:34 < Zor> before fun gets invoked.
21:01:50 < Zor> that's in the description of the function call operator
21:01:59 < Zor> so it's regardless of linkage, I'd say
21:02:28 < Zor> besides, I think code relying on RTL evaluation will be very
rare
21:02:34 < Zor> LTR is what people intuitively expect

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