2 module Vectorise.Type.PADict
6 import Vectorise.Builtins
7 import Vectorise.Type.Repr
8 import Vectorise.Type.PRepr
9 import Vectorise.Type.PRDict
10 import Vectorise.Utils
25 -- dtrace s x = if debug then pprTrace "Vectoris.Type.PADict" s x else x
27 -- | Build the PA dictionary for some type and hoist it to top level.
28 -- The PA dictionary holds fns that convert values to and from their vectorised representations.
30 :: TyCon -- ^ tycon of the type being vectorised.
31 -> TyCon -- ^ tycon of the type used for the vectorised representation.
33 -> SumRepr -- ^ representation used for the type being vectorised.
34 -> VM Var -- ^ name of the top-level dictionary function.
36 buildPADict vect_tc prepr_tc arr_tc repr
37 = polyAbstract tvs $ \args ->
39 (_:_) -> pprPanic "Vectorise.Type.PADict.buildPADict" (text "why do we need superclass dicts?")
41 -- TODO: I'm forcing args to [] because I'm not sure why we need them.
42 -- class PA has superclass (PR (PRepr a)) but we're not using
43 -- the superclass dictionary to build the PA dictionary.
45 -- Get ids for each of the methods in the dictionary.
46 method_ids <- mapM (method args) paMethods
48 -- Expression to build the dictionary.
49 pa_dc <- builtin paDataCon
50 let dict = mkLams (tvs ++ args)
52 $ Type inst_ty : map (method_call args) method_ids
54 -- Build the type of the dictionary function.
55 pa_tc <- builtin paTyCon
56 let Just pa_cls = tyConClass_maybe pa_tc
58 let dfun_ty = mkForAllTys tvs
59 $ mkFunTys (map varType args) (PredTy $ ClassP pa_cls [inst_ty])
61 -- Set the unfolding for the inliner.
62 raw_dfun <- newExportedVar dfun_name dfun_ty
63 let dfun_unf = mkDFunUnfolding dfun_ty (map (DFunPolyArg . Var) method_ids)
64 dfun = raw_dfun `setIdUnfolding` dfun_unf
65 `setInlinePragma` dfunInlinePragma
67 -- Add the new binding to the top-level environment.
68 hoistBinding dfun dict
71 tvs = tyConTyVars vect_tc
72 arg_tys = mkTyVarTys tvs
73 inst_ty = mkTyConApp vect_tc arg_tys
75 dfun_name = mkPADFunOcc (getOccName vect_tc)
77 method args (name, build)
80 expr <- build vect_tc prepr_tc arr_tc repr
81 let body = mkLams (tvs ++ args) expr
82 raw_var <- newExportedVar (method_name name) (exprType body)
84 `setIdUnfolding` mkInlineUnfolding (Just (length args)) body
85 `setInlinePragma` alwaysInlinePragma
89 method_call args id = mkApps (Var id) (map Type arg_tys ++ map Var args)
90 method_name name = mkVarOcc $ occNameString dfun_name ++ ('$' : name)
93 paMethods :: [(String, TyCon -> TyCon -> TyCon -> SumRepr -> VM CoreExpr)]
94 paMethods = [("dictPRepr", buildPRDict),
95 ("toPRepr", buildToPRepr),
96 ("fromPRepr", buildFromPRepr),
97 ("toArrPRepr", buildToArrPRepr),
98 ("fromArrPRepr", buildFromArrPRepr)]