Re: Alternative to isTypeLevPoly

The type argument to LitRubbish should be a fixed RuntimeRep. If it is not, you can file a bug. I have fixed a related bug in f435d55fe969e7. Krzysztof On Thu, Sep 15, 2022 at 1:12 PM Csaba Hruska wrote:

I've investigated a bit more. You are right `typeHasFixedRuntimeRep` works fine, the panic was caused by querying the representation type of `LitRubbish` type argument. In some cases `getRuntimeRep` causes GHC panic for `LitRubbish` type arguments. I did solve the issue with special casing the LitRubbish type argument handling by using only the `runtimeRepPrimRep` function. In the general case I tested the type with `isUnboxedTupleType` and `isUnboxedSumType` which rely on `getRuntimeRep`. Thanks for the tips and feedback. Regards, Csaba

On Wed, Sep 14, 2022 at 6:44 PM Sam Derbyshire wrote:

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Hmm, that's strange, both isTypeLevPoly and typeHasFixedRuntimeRep have the same precondition: the kind of the type is of the form TYPE rep. So they should panic in the same circumstances. Can you give a bit more information? What panics are you running into?

On Wed, 14 Sept 2022 at 18:40, Csaba Hruska wrote:

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Hi, Thanks for the tip, I've tried it and it behaves differently than isTypeLevPoly. I can get panic when querying the reptype for fixed reptypes. That means isTypeLevPoly semantically is not the same as the negated result of typeHasFixedRuntimeRep.

On Wed, 14 Sep 2022, 18:19 Sam Derbyshire, wrote:

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Hi Csaba,

I think you want the function typeHasFixedRuntimeRep from GHC.Core.Type.

Best,

Sam

On Wed, 14 Sept 2022 at 18:12, Csaba Hruska wrote:

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Hello GHC Devs,

I've noticed that the `isTypeLevPoly` function has been removed from GHC since 9.4. I used it to decide the validity of querying the representation type of every value in the STG IR. It was mandatory to prevent GHC panics, because there are a lot of partial functions in GHC. Is there an alternative to `isTypeLevPoly` in GHC 9.4?

Best regards, Csaba Hruska _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs

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