\section[Specialise]{Stamping out overloading, and (optionally) polymorphism}
\begin{code}
-#include "HsVersions.h"
-
module SpecUtils (
specialiseCallTys,
- SYN_IE(ConstraintVector),
+ ConstraintVector,
getIdOverloading,
- mkConstraintVector,
isUnboxedSpecialisation,
specialiseConstrTys,
pprSpecErrs
) where
-IMP_Ubiq(){-uitous-}
+#include "HsVersions.h"
-import Bag ( isEmptyBag, bagToList )
-import Class ( classOpString, GenClass{-instance NamedThing-} )
+import CmdLineOpts ( opt_SpecialiseOverloaded, opt_SpecialiseUnboxed,
+ opt_SpecialiseAll
+ )
+import Bag ( isEmptyBag, bagToList, Bag )
+import Class ( Class )
import FiniteMap ( emptyFM, addListToFM_C, plusFM_C, keysFM,
lookupWithDefaultFM
)
-import Id ( idType, isDictFunId, isConstMethodId_maybe,
- isDefaultMethodId_maybe,
- GenId {-instance NamedThing -}
- )
+import Id ( Id )
import Maybes ( maybeToBool, catMaybes, firstJust )
-import Name ( origName, isLexVarSym, isLexSpecialSym, pprNonSym )
-import PprStyle ( PprStyle(..) )
-import PprType ( pprGenType, pprParendGenType, pprMaybeTy,
- TyCon{-ditto-}, GenType{-ditto-}, GenTyVar
- )
-import Pretty -- plenty of it
-import TyCon ( tyConTyVars, TyCon{-instance NamedThing-} )
-import Type ( splitSigmaTy, mkTyVarTy, mkForAllTys,
- getTyVar_maybe, isUnboxedType
+import Name ( OccName, pprOccName, modAndOcc, NamedThing(..) )
+import Outputable
+import PprType ( pprParendType, pprMaybeTy, TyCon )
+import TyCon ( tyConTyVars )
+import Type ( mkSigmaTy, instantiateTauTy, instantiateThetaTy,
+ splitSigmaTy, mkTyVarTy, mkForAllTys,
+ isUnboxedType, Type
)
-import TyVar ( GenTyVar{-instance Eq-} )
-import Unique ( Unique{-instance Eq-} )
-import Util ( equivClasses, zipWithEqual, cmpPString,
+import TyVar ( TyVar, mkTyVarEnv )
+import Util ( equivClasses, zipWithEqual,
assertPanic, panic{-ToDo:rm-}
)
+
cmpType = panic "SpecUtils.cmpType (ToDo: get rid of)"
-mkSameSpecCon = panic "SpecUtils.mkSameSpecCon (ToDo)"
getInstIdModule = panic "SpecUtils.getInstIdModule (ToDo)"
-specialiseTy :: Type -> [Maybe Type] -> Int -> Type
-specialiseTy = panic "SpecUtils.specialiseTy (ToDo)"
+mkSameSpecCon = panic "SpecUtils.mkSameSpecCon (ToDo)"
\end{code}
+
+\begin{code}
+specialiseTy :: Type -- The type of the Id of which the SpecId
+ -- is a specialised version
+ -> [Maybe Type] -- The types at which it is specialised
+ -> Int -- Number of leading dictionary args to ignore
+ -> Type
+
+specialiseTy main_ty maybe_tys dicts_to_ignore
+ = mkSigmaTy remaining_tyvars
+ (instantiateThetaTy inst_env remaining_theta)
+ (instantiateTauTy inst_env tau)
+ where
+ (tyvars, theta, tau) = splitSigmaTy main_ty -- A prefix of, but usually all,
+ -- the theta is discarded!
+ remaining_theta = drop dicts_to_ignore theta
+ tyvars_and_maybe_tys = tyvars `zip` maybe_tys
+ remaining_tyvars = [tyvar | (tyvar, Nothing) <- tyvars_and_maybe_tys]
+ inst_env = mkTyVarEnv [(tyvar,ty) | (tyvar, Just ty) <- tyvars_and_maybe_tys]
+\end{code}
+
+
@specialiseCallTys@ works out which type args don't need to be specialised on,
based on flags, the overloading constraint vector, and the types.
\begin{code}
-specialiseCallTys :: Bool -- Specialise on all type args
- -> Bool -- Specialise on unboxed type args
- -> Bool -- Specialise on overloaded type args
- -> ConstraintVector -- Tells which type args are overloaded
- -> [Type] -- Type args
- -> [Maybe Type] -- Nothings replace non-specialised type args
-
-specialiseCallTys True _ _ cvec tys
- = map Just tys
-specialiseCallTys False spec_unboxed spec_overloading cvec tys
- = zipWithEqual "specialiseCallTys" spec_ty_other cvec tys
+specialiseCallTys :: ConstraintVector -- Tells which type args are overloaded
+ -> [Type] -- Type args
+ -> [Maybe Type] -- Nothings replace non-specialised type args
+
+specialiseCallTys cvec tys
+ | opt_SpecialiseAll = map Just tys
+ | otherwise = zipWithEqual "specialiseCallTys" spec_ty_other cvec tys
where
- spec_ty_other c ty | (spec_unboxed && isUnboxedType ty)
- || (spec_overloading && c)
- = Just ty
- | otherwise
- = Nothing
+ spec_ty_other c ty | (opt_SpecialiseUnboxed && isUnboxedType ty) ||
+ (opt_SpecialiseOverloaded && c)
+ = Just ty
+ | otherwise = Nothing
+
\end{code}
@getIdOverloading@ grabs the type of an Id, and returns a
\begin{code}
getIdOverloading :: Id
-> ([TyVar], [(Class,TyVar)])
+getIdOverloading = panic "getIdOverloading"
+
+-- Looks suspicious to me; and I'm not sure what corresponds to
+-- (Class,TyVar) pairs in the multi-param type class world.
+{-
getIdOverloading id
= (tyvars, tyvar_part_of theta)
where
tyvar_part_of ((c,ty):theta) = case (getTyVar_maybe ty) of
Nothing -> []
Just tv -> (c, tv) : tyvar_part_of theta
+-}
\end{code}
\begin{code}
type ConstraintVector = [Bool] -- True for constrained tyvar, false otherwise
-
-mkConstraintVector :: Id
- -> ConstraintVector
-
-mkConstraintVector id
- = [tyvar `elem` constrained_tyvars | tyvar <- tyvars]
- where
- (tyvars, class_tyvar_pairs) = getIdOverloading id
- constrained_tyvars = map snd class_tyvar_pairs -- May contain dups
\end{code}
\begin{code}
\begin{code}
argTysMatchSpecTys_error :: [Maybe Type]
-> [Type]
- -> Maybe Pretty
+ -> Maybe SDoc
argTysMatchSpecTys_error spec_tys arg_tys
= if match spec_tys arg_tys
then Nothing
- else Just (ppSep [ppStr "Spec and Arg Types Inconsistent:",
- ppStr "spectys=", ppSep [pprMaybeTy PprDebug ty | ty <- spec_tys],
- ppStr "argtys=", ppSep [pprParendGenType PprDebug ty | ty <- arg_tys]])
+ else Just (sep [ptext SLIT("Spec and Arg Types Inconsistent:"),
+ ptext SLIT("spectys="), sep [pprMaybeTy ty | ty <- spec_tys],
+ ptext SLIT("argtys="), sep [pprParendType ty | ty <- arg_tys]])
where
match (Nothing:spec_tys) (arg:arg_tys)
= not (isUnboxedType arg) &&
match spec_tys arg_tys
match (Just spec:spec_tys) (arg:arg_tys)
= case (cmpType True{-properly-} spec arg) of
- EQ_ -> match spec_tys arg_tys
+ EQ -> match spec_tys arg_tys
other -> False
match [] [] = True
match _ _ = False
-> (Bag (Id,[Maybe Type])) -- errors
-> (Bag (Id,[Maybe Type])) -- warnings
-> (Bag (TyCon,[Maybe Type])) -- errors
- -> Pretty
+ -> SDoc
pprSpecErrs this_mod spec_errs spec_warn spec_tyerrs
| not any_errs && not any_warn
- = ppNil
+ = empty
| otherwise
- = ppAboves [
- ppStr "SPECIALISATION MESSAGES:",
- ppAboves (map pp_module_specs use_modules)
+ = vcat [
+ ptext SLIT("SPECIALISATION MESSAGES:"),
+ vcat (map pp_module_specs use_modules)
]
where
any_errs = not (isEmptyBag spec_errs && isEmptyBag spec_tyerrs)
where
(mod_name, id_name) = get_id_name id
+
get_id_name id
+
+{- Don't understand this -- and looks TURGID. SLPJ 4 Nov 96
| maybeToBool (isDefaultMethodId_maybe id)
= (this_mod, _NIL_)
in (use_mod, _NIL_)
| otherwise
- = case (origName "get_id_name" id) of { OrigName m n -> (m, n) }
+-}
+ = modAndOcc id
get_ty_data (ty, tys)
= (mod_name, [(ty_name, ty, tys)])
where
- (OrigName mod_name ty_name) = origName "get_ty_data" ty
+ (mod_name, ty_name) = modAndOcc ty
module_names = concat [keysFM idspecs_fm, keysFM tyspecs_fm]
- mods = map head (equivClasses _CMP_STRING_ module_names)
+ mods = map head (equivClasses compare module_names)
(unks, known) = if null mods
then ([], [])
- else case _CMP_STRING_ (head mods) _NIL_ of
- EQ_ -> ([_NIL_], tail mods)
+ else case head mods `compare` _NIL_ of
+ EQ -> ([_NIL_], tail mods)
other -> ([], mods)
use_modules = unks ++ known
- pp_module_specs :: FAST_STRING -> Pretty
+ pp_module_specs :: FAST_STRING -> SDoc
pp_module_specs mod
| mod == _NIL_
= ASSERT (null mod_tyspecs)
- ppAboves (map (pp_idspec ty_sty (ppStr "UNKNOWN:")) mod_idspecs)
+ vcat (map (pp_idspec (ptext SLIT("UNKNOWN:"))) mod_idspecs)
| have_specs
- = ppAboves [
- ppAboves (map (pp_tyspec ty_sty (pp_module mod)) mod_tyspecs),
- ppAboves (map (pp_idspec ty_sty (pp_module mod)) mod_idspecs)
+ = vcat [
+ vcat (map (pp_tyspec (pp_module mod)) mod_tyspecs),
+ vcat (map (pp_idspec (pp_module mod)) mod_idspecs)
]
| otherwise
- = ppNil
+ = empty
where
mod_tyspecs = lookupWithDefaultFM tyspecs_fm [] mod
mod_idspecs = lookupWithDefaultFM idspecs_fm [] mod
have_specs = not (null mod_tyspecs && null mod_idspecs)
- ty_sty = PprInterface
pp_module mod
- = ppBesides [ppPStr mod, ppStr ":"]
+ = hcat [ptext mod, char ':']
-pp_tyspec :: PprStyle -> Pretty -> (FAST_STRING, TyCon, [Maybe Type]) -> Pretty
+pp_tyspec :: SDoc -> (OccName, TyCon, [Maybe Type]) -> SDoc
-pp_tyspec sty pp_mod (_, tycon, tys)
- = ppCat [pp_mod,
- ppStr "{-# SPECIALIZE", ppStr "data",
- pprNonSym PprForUser tycon, ppCat (map (pprParendGenType sty) spec_tys),
- ppStr "#-}", ppStr "{- Essential -}"
+pp_tyspec pp_mod (_, tycon, tys)
+ = hsep [pp_mod,
+ text "{-# SPECIALIZE data",
+ ppr tycon, hsep (map pprParendType spec_tys),
+ text "-} {- Essential -}"
]
where
tvs = tyConTyVars tycon
choose_ty (tv, Nothing) = (mkTyVarTy tv, Just tv)
choose_ty (tv, Just ty) = (ty, Nothing)
-pp_idspec :: PprStyle -> Pretty -> (FAST_STRING, Id, [Maybe Type], Bool) -> Pretty
+pp_idspec :: SDoc -> (OccName, Id, [Maybe Type], Bool) -> SDoc
+pp_idspec = error "pp_idspec"
+
+{- LATER
-pp_idspec sty pp_mod (_, id, tys, is_err)
+pp_idspec pp_mod (_, id, tys, is_err)
| isDictFunId id
- = ppCat [pp_mod,
- ppStr "{-# SPECIALIZE",
- ppStr "instance",
- pprGenType sty spec_ty,
- ppStr "#-}", pp_essential ]
+ = hsep [pp_mod,
+ text "{-# SPECIALIZE instance",
+ pprGenType spec_ty,
+ text "#-}", pp_essential ]
| is_const_method_id
= let
Just (cls, clsty, clsop) = const_method_maybe
- (OrigName _ cls_str) = origName "pp_idspec" cls
- clsop_str = classOpString clsop
in
- ppCat [pp_mod,
- ppStr "{-# SPECIALIZE",
- pp_clsop clsop_str, ppStr "::",
- pprGenType sty spec_ty,
- ppStr "#-} {- IN instance",
- ppPStr cls_str, pprParendGenType sty clsty,
- ppStr "-}", pp_essential ]
+ hsep [pp_mod,
+ text "{-# SPECIALIZE",
+ ppr clsop, text "::",
+ pprGenType spec_ty,
+ text "#-} {- IN instance",
+ pprOccName (getOccName cls), pprParendType clsty,
+ text "-}", pp_essential ]
| is_default_method_id
= let
Just (cls, clsop, _) = default_method_maybe
- (OrigName _ cls_str) = origName "pp_idspec2" cls
- clsop_str = classOpString clsop
in
- ppCat [pp_mod,
- ppStr "{- instance",
- ppPStr cls_str,
- ppStr "EXPLICIT METHOD REQUIRED",
- pp_clsop clsop_str, ppStr "::",
- pprGenType sty spec_ty,
- ppStr "-}", pp_essential ]
+ hsep [pp_mod,
+ text "{- instance",
+ pprOccName (getOccName cls),
+ ptext SLIT("EXPLICIT METHOD REQUIRED"),
+ ppr clsop, text "::",
+ pprGenType spec_ty,
+ text "-}", pp_essential ]
| otherwise
- = ppCat [pp_mod,
- ppStr "{-# SPECIALIZE",
- pprNonSym PprForUser id, ppStr "::",
- pprGenType sty spec_ty,
- ppStr "#-}", pp_essential ]
+ = hsep [pp_mod,
+ text "{-# SPECIALIZE",
+ ppr id, ptext SLIT("::"),
+ pprGenType spec_ty,
+ text "#-}", pp_essential ]
where
spec_ty = specialiseTy (idType id) tys 100 -- HACK to drop all dicts!!!
- pp_essential = if is_err then ppStr "{- Essential -}" else ppNil
+ pp_essential = if is_err then text "{- Essential -}" else empty
const_method_maybe = isConstMethodId_maybe id
is_const_method_id = maybeToBool const_method_maybe
default_method_maybe = isDefaultMethodId_maybe id
is_default_method_id = maybeToBool default_method_maybe
- pp_clsop str | isLexVarSym str && not (isLexSpecialSym str)
- = ppParens (ppPStr str)
- | otherwise
- = ppPStr str
-
+-}
\end{code}
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