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<p class="MsoNormal" style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:36.0pt">
If names get different ordering keys when reified from different modules (seems like they'd have to, particularly given ghc's "-j"), then we end up with an unpleasant circumstance where these do not compare as equal<o:p></o:p></p>
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<o:p> </o:p></p>
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The I believe that global, top level names (NameG) are not subject to this ordering stuff, so I don’t think this problem can occur.<o:p></o:p></p>
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<o:p> </o:p></p>
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This is a breaking change and it doesn't fix the problem that NameFlavour is<o:p></o:p></p>
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not abstract and leaks the Uniques. It would break at least:<o:p></o:p></p>
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<o:p> </o:p></p>
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But why is NameU exposed to clients? GHC needs to know, but clients don’t. What use are these packages making of it?<o:p></o:p></p>
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<o:p> </o:p></p>
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S<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> ghc-devs [mailto:ghc-devs-bounces@haskell.org]
<b>On Behalf Of </b>Michael Sloan<br>
<b>Sent:</b> 02 June 2016 02:07<br>
<b>To:</b> Bartosz Nitka <niteria@gmail.com><br>
<b>Cc:</b> ghc-devs Devs <ghc-devs@haskell.org><br>
<b>Subject:</b> Re: Template Haskell determinism<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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+1 to solving this. Not sure about the approach, but assuming the following concerns are addressed, I'm (+1) on it too:<o:p></o:p></p>
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<o:p> </o:p></p>
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This solution is clever! However, I think there is some difficulty to determining this ordering key. Namely, what happens when I construct the (Set Name) using results from multiple reifies?<o:p></o:p></p>
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<o:p> </o:p></p>
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One solution is to have the ordering key be a consecutive supply that's initialized on a per-module basis. There is still an issue there, though, which is that you might store one of these names in a global IORef that's used by a later TH splice. Or, similarly,
serialize the names to a file and later load them. At least in those cases you need to use 'runIO' to break determinism.<o:p></o:p></p>
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<o:p> </o:p></p>
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If names get different ordering keys when reified from different modules (seems like they'd have to, particularly given ghc's "-j"), then we end up with an unpleasant circumstance where these do not compare as equal. How about having the Eq instance ignore
the ordering key? I think that mostly resolves this concern. This implies that the Ord instance should also yield EQ and ignore the ordering key, when the unique key matches.<o:p></o:p></p>
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<o:p> </o:p></p>
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One issue with this is that switching the order of reify could unexpectedly vary the behavior.<o:p></o:p></p>
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<o:p> </o:p></p>
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Does the map in TcGblEnv imply that a reify from a later module will get the same ordering key? So does this mean that the keys used in a given reify depend on which things have already been reified? In that case, then this is also an issue with your solution.
Now, it's not a big problem at all, just surprising to the user.<o:p></o:p></p>
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<o:p> </o:p></p>
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<o:p> </o:p></p>
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If the internal API for Name does change, may as well address <a href="https://ghc.haskell.org/trac/ghc/ticket/10311">
https://ghc.haskell.org/trac/ghc/ticket/10311</a> too. I agree with SPJ's suggested solution of having both the traditional package identifier and package keys in 'Name'. <o:p></o:p></p>
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<o:p> </o:p></p>
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-Michael<o:p></o:p></p>
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<o:p> </o:p></p>
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On Tue, May 31, 2016 at 6:54 AM, Bartosz Nitka <<a href="mailto:niteria@gmail.com" target="_blank">niteria@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:0cm">
Template Haskell with its ability to do arbitrary IO is non-deterministic by<o:p></o:p></p>
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design. You could for example embed the current date in a file. There is<o:p></o:p></p>
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however one kind of non-deterministic behavior that you can trigger <o:p></o:p></p>
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accidentally. It has to do with how Names are reified. If you take a look at <o:p></o:p></p>
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the definition of reifyName you can see that it puts the assigned Unique in a<o:p></o:p></p>
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NameU:<o:p></o:p></p>
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<o:p> </o:p></p>
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reifyName :: NamedThing n => n -> TH.Name<o:p></o:p></p>
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reifyName thing<o:p></o:p></p>
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| isExternalName name = mk_varg pkg_str mod_str occ_str<o:p></o:p></p>
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| otherwise = TH.mkNameU occ_str (getKey (getUnique name))<o:p></o:p></p>
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...<o:p></o:p></p>
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NameFlavour which NameU is a constructor of has a default Ord instance, meaning<o:p></o:p></p>
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that it ends up comparing the Uniques. The relative ordering of Uniques is not<o:p></o:p></p>
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guaranteed to be stable across recompilations [1], so this can lead to <o:p></o:p></p>
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ABI-incompatible binaries.<o:p></o:p></p>
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<o:p> </o:p></p>
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This isn't an abstract problem and it actually happens in practice. The <o:p></o:p></p>
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microlens package keeps Names in a Set and later turns that set into a list.<o:p></o:p></p>
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The results have different orders of TyVars resulting in different ABI hashes<o:p></o:p></p>
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and can potentially be optimized differently.<o:p></o:p></p>
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<o:p> </o:p></p>
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I believe it's worth to handle this case in a deterministic way and I have a<o:p></o:p></p>
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solution in mind. The idea is to extend NameU (and potentially NameL) with an<o:p></o:p></p>
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ordering key. To be more concrete:<o:p></o:p></p>
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<o:p> </o:p></p>
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- | NameU !Int<o:p></o:p></p>
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+ | NameU !Int !Int<o:p></o:p></p>
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<o:p> </o:p></p>
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This way the Ord instance can use a stable key and the problem reduces to<o:p></o:p></p>
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ensuring the keys are stable. To generate stable keys we can use the fact that<o:p></o:p></p>
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reify traverses the expressions in the same order every time and sequentially<o:p></o:p></p>
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allocate new keys based on traversal order. The way I have it implemented now <o:p></o:p></p>
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is to add a new field in TcGblEnv which maps Uniques to allocated keys:<o:p></o:p></p>
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<o:p> </o:p></p>
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+ tcg_th_names :: TcRef (UniqFM Int, Int),<o:p></o:p></p>
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<o:p> </o:p></p>
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Then the reifyName and qNewName do the necessary bookkeeping and translate the<o:p></o:p></p>
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Uniques on the fly.<o:p></o:p></p>
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<o:p> </o:p></p>
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This is a breaking change and it doesn't fix the problem that NameFlavour is<o:p></o:p></p>
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not abstract and leaks the Uniques. It would break at least:<o:p></o:p></p>
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<o:p> </o:p></p>
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- singletons<o:p></o:p></p>
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- th-lift<o:p></o:p></p>
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- haskell-src-meta<o:p></o:p></p>
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- shakespeare<o:p></o:p></p>
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- distributed-closure<o:p></o:p></p>
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<o:p> </o:p></p>
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I'd like to get feedback if this is an acceptable solution and if the problem<o:p></o:p></p>
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is worth solving.<o:p></o:p></p>
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<o:p> </o:p></p>
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Cheers,<o:p></o:p></p>
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Bartosz<o:p></o:p></p>
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<o:p> </o:p></p>
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[1] <a href="https://ghc.haskell.org/trac/ghc/wiki/DeterministicBuilds#NondeterministicUniques" target="_blank">
https://ghc.haskell.org/trac/ghc/wiki/DeterministicBuilds#NondeterministicUniques</a><o:p></o:p></p>
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<br>
_______________________________________________<br>
ghc-devs mailing list<br>
<a href="mailto:ghc-devs@haskell.org">ghc-devs@haskell.org</a><br>
<a href="https://na01.safelinks.protection.outlook.com/?url=http%3a%2f%2fmail.haskell.org%2fcgi-bin%2fmailman%2flistinfo%2fghc-devs&data=01%7c01%7csimonpj%40064d.mgd.microsoft.com%7c1a4a84c9341546403e1508d38a8246ee%7c72f988bf86f141af91ab2d7cd011db47%7c1&sdata=mjEDuk%2fuRsDLg0q63zaIBeh5e2IyfKnKjcEcRLDvERE%3d" target="_blank">http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs</a><o:p></o:p></p>
</blockquote>
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<o:p> </o:p></p>
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