Dear list, I'm using the GHC API to get Core Expressions from haskell interface (.hi) files, and have encountered a strange kind of 'Id' for which I can't seem to get the unfolding:
The properties of this 'Id' are the following: - varName: $fNumFixed2 - IdDetails: VannillaId - Pretty print of IdInfo.inlinePragInfo: [Always] - IdInfo.unfoldingInfo: NoUnfolding The source file which gives rise to this 'Id' is: https://github.com/christiaanb/clash-prelude/blob/master/src/CLaSH/Sized/Fixed.hs As you can see, the file is compiled with: -fexpose-all-unfoldings The '$f' prefix seems to indicate that the 'Id' is a Dictionary Function, so I was expecting its 'IdInfo.unfoldingInfo' to be a 'DFunUnfolding'. Given that pretty printing 'inlinePragInfo' gives me '[Always]', I would expect to have a usable 'Unfolding' in general. How can GHC inline the body of this 'Id' if it has no unfolding? Also, if I compile the file with "-O0 -fno-omit-interface-pragmas", the $fNumFixed2 'Id' is no longer included in the interface file. At positions where "$fNumFixed2" was originally used, a equality constraint can eventually be found: Using -O: (CLaSH.Sized.Fixed.$fNumFixed2 @(GHC.TypeLits.+ 4 4) Using -O0 -fno-omit-interface-pragmas: (GHC.Types.Eq# @GHC.Types.Bool @(GHC.TypeLits.<=? 1 (GHC.TypeLits.+ 4 4)) @GHC.Types.True _CO_) So my question is, what kind of "strange" 'Id' is this $fNumFixed2? And how can I get the Core expression for this 'Id' from the interface file? And if I can't get it from the interface file, is there a straightforward way to generate it from the 'Id'? Cheers, Christiaan _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
