\begin{code}
module TyCon(
- TyCon, KindCon, SuperKindCon, ArgVrcs, AlgTyConFlavour(..),
+ TyCon, KindCon, SuperKindCon, ArgVrcs,
+
+ AlgTyConFlavour(..),
+ DataConDetails(..), visibleDataCons,
isFunTyCon, isUnLiftedTyCon, isBoxedTyCon, isProductTyCon,
isAlgTyCon, isDataTyCon, isSynTyCon, isNewTyCon, isPrimTyCon,
mkForeignTyCon, isForeignTyCon,
- mkAlgTyCon, --mkAlgTyCon,
+ mkAlgTyCon,
mkClassTyCon,
mkFunTyCon,
mkPrimTyCon,
tyConUnique,
tyConTyVars,
tyConArgVrcs_maybe,
- tyConDataCons, tyConDataConsIfAvailable, tyConFamilySize,
+ tyConDataConDetails, tyConDataCons, tyConDataCons_maybe, tyConFamilySize,
tyConSelIds,
tyConTheta,
tyConPrimRep,
import Name ( Name, nameUnique, NamedThing(getName) )
import PrelNames ( Unique, Uniquable(..), anyBoxConKey )
import PrimRep ( PrimRep(..), isFollowableRep )
+import Maybes ( expectJust )
import Outputable
import FastString
\end{code}
tyConArgVrcs :: ArgVrcs,
algTyConTheta :: [PredType],
- dataCons :: [DataCon],
- -- Its data constructors, with fully polymorphic types
- -- This list can be empty, when we import a data type abstractly,
- -- either (a) the interface is hand-written and doesn't give
- -- the constructors, or
- -- (b) in a quest for fast compilation we don't import
- -- the constructors
+ dataCons :: DataConDetails DataCon,
selIds :: [Id], -- Its record selectors (if any)
- noOfDataCons :: Int, -- Number of data constructors
- -- Usually this is the same as the length of the
- -- dataCons field, but the latter may be empty if
- -- we imported the type abstractly. But even if we import
- -- abstractly we still need to know the number of constructors
- -- so we can get the return convention right. Tiresome!
-
algTyConFlavour :: AlgTyConFlavour,
- algTyConRec :: RecFlag, -- Tells whether the data type is part of
- -- a mutually-recursive group or not
+ algTyConRec :: RecFlag, -- Tells whether the data type is part of
+ -- a mutually-recursive group or not
genInfo :: Maybe (EP Id), -- Convert T <-> Tring
-- Some TyCons don't have it;
-- e.g. the TyCon for a Class dictionary,
-- and TyCons with unboxed arguments
- algTyConClass :: Maybe Class -- Just cl if this tycon came from a class declaration
+ algTyConClass :: Maybe Class
+ -- Just cl if this tycon came from a class declaration
}
| PrimTyCon { -- Primitive types; cannot be defined in Haskell
-- The rep type isn't entirely simple:
-- for a recursive newtype we pick () as the rep type
-- newtype T = MkT T
+
+data DataConDetails datacon
+ = DataCons [datacon] -- Its data constructors, with fully polymorphic types
+ -- A type can have zero constructors
+
+ | Unknown -- We're importing this data type from an hi-boot file
+ -- and we don't know what its constructors are
+
+ | HasCons Int -- In a quest for compilation speed we have imported
+ -- only the number of constructors (to get return
+ -- conventions right) but not the constructors themselves
+
+visibleDataCons (DataCons cs) = cs
+visibleDataCons other = []
\end{code}
+
%************************************************************************
%* *
\subsection{TyCon Construction}
-- This is the making of a TyCon. Just the same as the old mkAlgTyCon,
-- but now you also have to pass in the generic information about the type
-- constructor - you can get hold of it easily (see Generics module)
-mkAlgTyCon name kind tyvars theta argvrcs cons ncons sels flavour rec
+mkAlgTyCon name kind tyvars theta argvrcs cons sels flavour rec
gen_info
= AlgTyCon {
tyConName = name,
algTyConTheta = theta,
dataCons = cons,
selIds = sels,
- noOfDataCons = ncons,
algTyConClass = Nothing,
algTyConFlavour = flavour,
algTyConRec = rec,
tyConTyVars = tyvars,
tyConArgVrcs = argvrcs,
algTyConTheta = [],
- dataCons = [con],
+ dataCons = DataCons [con],
selIds = [],
- noOfDataCons = 1,
algTyConClass = Just clas,
algTyConFlavour = flavour,
algTyConRec = rec,
-- may be DataType or NewType,
-- may be unboxed or not,
-- may be recursive or not
-isProductTyCon (AlgTyCon {dataCons = [data_con]}) = not (isExistentialDataCon data_con)
-isProductTyCon (TupleTyCon {}) = True
-isProductTyCon other = False
+isProductTyCon (AlgTyCon {dataCons = DataCons [data_con]}) = not (isExistentialDataCon data_con)
+isProductTyCon (TupleTyCon {}) = True
+isProductTyCon other = False
isSynTyCon (SynTyCon {}) = True
isSynTyCon _ = False
\end{code}
\begin{code}
+tyConDataConDetails :: TyCon -> DataConDetails DataCon
+tyConDataConDetails (AlgTyCon {dataCons = cons}) = cons
+tyConDataConDetails (TupleTyCon {dataCon = con}) = DataCons [con]
+tyConDataConDetails other = Unknown
+
tyConDataCons :: TyCon -> [DataCon]
-tyConDataCons tycon = ASSERT2( length cons == tyConFamilySize tycon, ppr tycon )
- cons
- where
- cons = tyConDataConsIfAvailable tycon
-
-tyConDataConsIfAvailable (AlgTyCon {dataCons = cons}) = cons -- Empty for abstract types
-tyConDataConsIfAvailable (TupleTyCon {dataCon = con}) = [con]
-tyConDataConsIfAvailable other = []
- -- You may think this last equation should fail,
- -- but it's quite convenient to return no constructors for
- -- a synonym; see for example the call in TcTyClsDecls.
+tyConDataCons tycon = expectJust "tyConDataCons" (tyConDataCons_maybe tycon)
+
+tyConDataCons_maybe :: TyCon -> Maybe [DataCon]
+tyConDataCons_maybe (AlgTyCon {dataCons = DataCons cons}) = Just cons
+tyConDataCons_maybe (TupleTyCon {dataCon = con}) = Just [con]
+tyConDataCons_maybe other = Nothing
tyConFamilySize :: TyCon -> Int
-tyConFamilySize (AlgTyCon {noOfDataCons = n}) = n
-tyConFamilySize (TupleTyCon {}) = 1
+tyConFamilySize (AlgTyCon {dataCons = DataCons cs}) = length cs
+tyConFamilySize (AlgTyCon {dataCons = HasCons n}) = n
+tyConFamilySize (TupleTyCon {}) = 1
#ifdef DEBUG
tyConFamilySize other = pprPanic "tyConFamilySize:" (ppr other)
#endif
\begin{code}
tyConTheta :: TyCon -> [PredType]
tyConTheta (AlgTyCon {algTyConTheta = theta}) = theta
--- should ask about anything else
+tyConTheta (TupleTyCon {}) = []
+-- shouldn't ask about anything else
\end{code}
@tyConArgVrcs_maybe@ gives a list of (occPos,occNeg) flags, one for
\begin{code}
maybeTyConSingleCon :: TyCon -> Maybe DataCon
-maybeTyConSingleCon (AlgTyCon {dataCons = [c]}) = Just c
-maybeTyConSingleCon (AlgTyCon {}) = Nothing
-maybeTyConSingleCon (TupleTyCon {dataCon = con}) = Just con
-maybeTyConSingleCon (PrimTyCon {}) = Nothing
-maybeTyConSingleCon (FunTyCon {}) = Nothing -- case at funty
-maybeTyConSingleCon tc = pprPanic "maybeTyConSingleCon: unexpected tycon " $
- ppr tc
+maybeTyConSingleCon (AlgTyCon {dataCons = DataCons [c]}) = Just c
+maybeTyConSingleCon (AlgTyCon {}) = Nothing
+maybeTyConSingleCon (TupleTyCon {dataCon = con}) = Just con
+maybeTyConSingleCon (PrimTyCon {}) = Nothing
+maybeTyConSingleCon (FunTyCon {}) = Nothing -- case at funty
+maybeTyConSingleCon tc = pprPanic "maybeTyConSingleCon: unexpected tycon " $ ppr tc
\end{code}
\begin{code}
projects / ghc-hetmet.git / blobdiff