\begin{code}
module TyCon(
- TyCon, KindCon, SuperKindCon, ArgVrcs,
+ TyCon, KindCon, SuperKindCon, ArgVrcs,
+
+ AlgTyConFlavour(..),
+ DataConDetails(..), visibleDataCons,
isFunTyCon, isUnLiftedTyCon, isBoxedTyCon, isProductTyCon,
isAlgTyCon, isDataTyCon, isSynTyCon, isNewTyCon, isPrimTyCon,
- isEnumerationTyCon, isTupleTyCon, isUnboxedTupleTyCon,
+ isEnumerationTyCon,
+ isTupleTyCon, isUnboxedTupleTyCon, isBoxedTupleTyCon, tupleTyConBoxity,
+ isRecursiveTyCon, newTyConRep,
+
+ mkForeignTyCon, isForeignTyCon,
mkAlgTyCon,
+ mkClassTyCon,
mkFunTyCon,
mkPrimTyCon,
+ mkLiftedPrimTyCon,
mkTupleTyCon,
mkSynTyCon,
mkKindCon,
setTyConName,
+ tyConName,
tyConKind,
tyConUnique,
tyConTyVars,
tyConArgVrcs_maybe,
- tyConDataCons,
- tyConFamilySize,
- tyConDerivings,
+ tyConDataConDetails, tyConDataCons, tyConDataCons_maybe, tyConFamilySize,
+ tyConSelIds,
tyConTheta,
tyConPrimRep,
tyConArity,
- tyConClass_maybe,
+ isClassTyCon, tyConClass_maybe,
getSynTyConDefn,
maybeTyConSingleCon,
- matchesTyCon
+ matchesTyCon,
+
+ -- Generics
+ tyConGenIds, tyConGenInfo
) where
#include "HsVersions.h"
-import {-# SOURCE #-} TypeRep ( Type, Kind, SuperKind )
+import {-# SOURCE #-} TypeRep ( Type, PredType, Kind, SuperKind )
-- Should just be Type(Type), but this fails due to bug present up to
-- and including 4.02 involving slurping of hi-boot files. Bug is now fixed.
import {-# SOURCE #-} DataCon ( DataCon, isExistentialDataCon )
-import Class ( Class )
-import Var ( TyVar )
-import BasicTypes ( Arity, NewOrData(..), RecFlag(..) )
-import Maybes
+
+import Var ( TyVar, Id )
+import Class ( Class )
+import BasicTypes ( Arity, RecFlag(..), Boxity(..),
+ isBoxed, EP(..) )
import Name ( Name, nameUnique, NamedThing(getName) )
-import Unique ( Unique, Uniquable(..), anyBoxConKey )
+import PrelNames ( Unique, Uniquable(..), anyBoxConKey )
import PrimRep ( PrimRep(..), isFollowableRep )
+import Maybes ( orElse )
import Outputable
+import FastString
\end{code}
%************************************************************************
tyConKind :: Kind,
tyConArity :: Arity,
- tyConTyVars :: [TyVar],
- dataTyConTheta :: [(Class,[Type])],
- dataTyConArgVrcs :: ArgVrcs,
-
- 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
-
- dataTyConDerivings :: [Class], -- Classes which have derived instances
-
- dataTyConClass_maybe :: (Maybe Class), -- Nothing for ordinary types;
- -- Just c for the type constructor
- -- for dictionaries of class c.
- algTyConFlavour :: NewOrData,
- algTyConRec :: RecFlag -- Tells whether the data type is part of
- -- a mutually-recursive group or not
+ tyConTyVars :: [TyVar],
+ tyConArgVrcs :: ArgVrcs,
+ algTyConTheta :: [PredType],
+
+ dataCons :: DataConDetails DataCon,
+
+ selIds :: [Id], -- Its record selectors (if any)
+
+ algTyConFlavour :: AlgTyConFlavour,
+ 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
}
- | PrimTyCon { -- Primitive types; cannot be defined in Haskell
- -- NB: All of these guys are *unlifted*, but not all are *unboxed*
+ | PrimTyCon { -- Primitive types; cannot be defined in Haskell
+ -- Now includes foreign-imported types
tyConUnique :: Unique,
tyConName :: Name,
tyConKind :: Kind,
tyConArity :: Arity,
- primTyConArgVrcs :: ArgVrcs,
- primTyConRep :: PrimRep
+ tyConArgVrcs :: ArgVrcs,
+ primTyConRep :: PrimRep, -- Many primitive tycons are unboxed, but some are
+ -- boxed (represented by pointers). The PrimRep tells.
+
+ isUnLifted :: Bool, -- Most primitive tycons are unlifted,
+ -- but foreign-imported ones may not be
+ tyConExtName :: Maybe FastString
}
| TupleTyCon {
tyConName :: Name,
tyConKind :: Kind,
tyConArity :: Arity,
- tyConBoxed :: Bool, -- True for boxed; False for unboxed
+ tyConBoxed :: Boxity,
tyConTyVars :: [TyVar],
- dataCon :: DataCon
+ dataCon :: DataCon,
+ genInfo :: Maybe (EP Id) -- Generic type and conv funs
}
| SynTyCon {
synTyConDefn :: Type, -- Right-hand side, mentioning these type vars.
-- Acts as a template for the expansion when
-- the tycon is applied to some types.
- synTyConArgVrcs :: ArgVrcs
+ tyConArgVrcs :: ArgVrcs
}
| KindCon { -- Type constructor at the kind level
}
type ArgVrcs = [(Bool,Bool)] -- Tyvar variance info: [(occPos,occNeg)]
- -- *NB*: this is tyvar variance info, *not*
- -- termvar usage info.
+
+data AlgTyConFlavour
+ = DataTyCon -- Data type
+
+ | EnumTyCon -- Special sort of enumeration type
+
+ | NewTyCon Type -- Newtype, with its *ultimate* representation type
+ -- By 'ultimate' I mean that the rep type is not itself
+ -- a newtype or type synonym.
+ -- The rep type isn't entirely simple:
+ -- for a recursive newtype we pick () as the rep type
+ -- newtype T = MkT T
+ --
+ -- The rep type has free type variables the tyConTyVars
+ -- Thus:
+ -- newtype T a = MkT [(a,Int)]
+ -- The rep type is [(a,Int)]
+ -- NB: the rep type isn't necessarily the original RHS of the
+ -- newtype decl, because the rep type looks through other
+ -- newtypes. If you want hte original RHS, look at the
+ -- argument type of the data constructor.
+
+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}
tyConKind = kind,
tyConArity = 2
}
-
-mkAlgTyCon name kind tyvars theta argvrcs cons derivs maybe_clas flavour rec
+
+tyConGenInfo :: TyCon -> Maybe (EP Id)
+tyConGenInfo (AlgTyCon { genInfo = info }) = info
+tyConGenInfo (TupleTyCon { genInfo = info }) = info
+tyConGenInfo other = Nothing
+
+tyConGenIds :: TyCon -> [Id]
+-- Returns the generic-programming Ids; these Ids need bindings
+tyConGenIds tycon = case tyConGenInfo tycon of
+ Nothing -> []
+ Just (EP from to) -> [from,to]
+
+-- 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 sels flavour is_rec
+ gen_info
= AlgTyCon {
- tyConName = name,
- tyConUnique = nameUnique name,
- tyConKind = kind,
- tyConArity = length tyvars,
- tyConTyVars = tyvars,
- dataTyConTheta = theta,
- dataTyConArgVrcs = argvrcs,
- dataCons = cons,
- dataTyConDerivings = derivs,
- dataTyConClass_maybe = maybe_clas,
- algTyConFlavour = flavour,
- algTyConRec = rec
+ tyConName = name,
+ tyConUnique = nameUnique name,
+ tyConKind = kind,
+ tyConArity = length tyvars,
+ tyConTyVars = tyvars,
+ tyConArgVrcs = argvrcs,
+ algTyConTheta = theta,
+ dataCons = cons,
+ selIds = sels,
+ algTyConClass = Nothing,
+ algTyConFlavour = flavour,
+ algTyConRec = is_rec,
+ genInfo = gen_info
+ }
+
+mkClassTyCon name kind tyvars argvrcs con clas flavour is_rec
+ = AlgTyCon {
+ tyConName = name,
+ tyConUnique = nameUnique name,
+ tyConKind = kind,
+ tyConArity = length tyvars,
+ tyConTyVars = tyvars,
+ tyConArgVrcs = argvrcs,
+ algTyConTheta = [],
+ dataCons = DataCons [con],
+ selIds = [],
+ algTyConClass = Just clas,
+ algTyConFlavour = flavour,
+ algTyConRec = is_rec,
+ genInfo = Nothing
}
-mkTupleTyCon name kind arity tyvars con boxed
+
+mkTupleTyCon name kind arity tyvars con boxed gen_info
= TupleTyCon {
tyConUnique = nameUnique name,
tyConName = name,
tyConArity = arity,
tyConBoxed = boxed,
tyConTyVars = tyvars,
- dataCon = con
+ dataCon = con,
+ genInfo = gen_info
}
-mkPrimTyCon name kind arity arg_vrcs rep
+-- Foreign-imported (.NET) type constructors are represented
+-- as primitive, but *lifted*, TyCons for now. They are lifted
+-- because the Haskell type T representing the (foreign) .NET
+-- type T is actually implemented (in ILX) as a thunk<T>
+-- They have PtrRep
+mkForeignTyCon name ext_name kind arity arg_vrcs
= PrimTyCon {
- tyConName = name,
- tyConUnique = nameUnique name,
- tyConKind = kind,
- tyConArity = arity,
- primTyConArgVrcs = arg_vrcs,
- primTyConRep = rep
+ tyConName = name,
+ tyConUnique = nameUnique name,
+ tyConKind = kind,
+ tyConArity = arity,
+ tyConArgVrcs = arg_vrcs,
+ primTyConRep = PtrRep,
+ isUnLifted = False,
+ tyConExtName = ext_name
+ }
+
+
+-- most Prim tycons are lifted
+mkPrimTyCon name kind arity arg_vrcs rep
+ = mkPrimTyCon' name kind arity arg_vrcs rep True
+
+-- but RealWorld is lifted
+mkLiftedPrimTyCon name kind arity arg_vrcs rep
+ = mkPrimTyCon' name kind arity arg_vrcs rep False
+
+mkPrimTyCon' name kind arity arg_vrcs rep is_unlifted
+ = PrimTyCon {
+ tyConName = name,
+ tyConUnique = nameUnique name,
+ tyConKind = kind,
+ tyConArity = arity,
+ tyConArgVrcs = arg_vrcs,
+ primTyConRep = rep,
+ isUnLifted = is_unlifted,
+ tyConExtName = Nothing
}
mkSynTyCon name kind arity tyvars rhs argvrcs
tyConArity = arity,
tyConTyVars = tyvars,
synTyConDefn = rhs,
- synTyConArgVrcs = argvrcs
+ tyConArgVrcs = argvrcs
}
setTyConName tc name = tc {tyConName = name, tyConUnique = nameUnique name}
+
\end{code}
\begin{code}
+isFunTyCon :: TyCon -> Bool
isFunTyCon (FunTyCon {}) = True
isFunTyCon _ = False
+isPrimTyCon :: TyCon -> Bool
isPrimTyCon (PrimTyCon {}) = True
isPrimTyCon _ = False
-isUnLiftedTyCon (PrimTyCon {}) = True
-isUnLiftedTyCon (TupleTyCon { tyConBoxed = False }) = True
-isUnLiftedTyCon _ = False
+isUnLiftedTyCon :: TyCon -> Bool
+isUnLiftedTyCon (PrimTyCon {isUnLifted = is_unlifted}) = is_unlifted
+isUnLiftedTyCon (TupleTyCon {tyConBoxed = boxity}) = not (isBoxed boxity)
+isUnLiftedTyCon _ = False
-- isBoxedTyCon should not be applied to SynTyCon, nor KindCon
+isBoxedTyCon :: TyCon -> Bool
isBoxedTyCon (AlgTyCon {}) = True
isBoxedTyCon (FunTyCon {}) = True
-isBoxedTyCon (TupleTyCon {tyConBoxed = boxed}) = boxed
+isBoxedTyCon (TupleTyCon {tyConBoxed = boxity}) = isBoxed boxity
isBoxedTyCon (PrimTyCon {primTyConRep = rep}) = isFollowableRep rep
-- isAlgTyCon returns True for both @data@ and @newtype@
+isAlgTyCon :: TyCon -> Bool
isAlgTyCon (AlgTyCon {}) = True
isAlgTyCon (TupleTyCon {}) = True
isAlgTyCon other = False
--- isDataTyCon returns False for @newtype@ and for unboxed tuples
-isDataTyCon (AlgTyCon {algTyConFlavour = new_or_data}) = case new_or_data of
- NewType -> False
- other -> True
-isDataTyCon (TupleTyCon {tyConBoxed = True}) = True
+isDataTyCon :: TyCon -> Bool
+-- isDataTyCon returns True for data types that are represented by
+-- heap-allocated constructors.
+-- These are srcutinised by Core-level @case@ expressions, and they
+-- get info tables allocated for them.
+-- True for all @data@ types
+-- False for newtypes
+-- unboxed tuples
+isDataTyCon (AlgTyCon {algTyConFlavour = new_or_data})
+ = case new_or_data of
+ NewTyCon _ -> False
+ other -> True
+
+isDataTyCon (TupleTyCon {tyConBoxed = boxity}) = isBoxed boxity
isDataTyCon other = False
-isNewTyCon (AlgTyCon {algTyConFlavour = NewType}) = True
-isNewTyCon other = False
+isNewTyCon :: TyCon -> Bool
+isNewTyCon (AlgTyCon {algTyConFlavour = NewTyCon _}) = True
+isNewTyCon other = False
--- A "product" tycon is
--- non-recursive
--- has one constructor,
+isProductTyCon :: TyCon -> Bool
+-- A "product" tycon
+-- has *one* constructor,
-- is *not* existential
--- is *not* an unboxed tuple
--- whether DataType or NewType
-isProductTyCon (AlgTyCon {dataCons = [data_con], algTyConRec = NonRecursive})
- = not (isExistentialDataCon data_con)
-isProductTyCon (TupleTyCon { tyConBoxed = boxed })
- = boxed
-isProductTyCon other = False
-
+-- but
+-- may be DataType or NewType,
+-- may be unboxed or not,
+-- may be recursive or not
+isProductTyCon (AlgTyCon {dataCons = DataCons [data_con]}) = not (isExistentialDataCon data_con)
+isProductTyCon (TupleTyCon {}) = True
+isProductTyCon other = False
+
+isSynTyCon :: TyCon -> Bool
isSynTyCon (SynTyCon {}) = True
isSynTyCon _ = False
-isEnumerationTyCon (AlgTyCon {algTyConFlavour = EnumType}) = True
-isEnumerationTyCon other = False
+isEnumerationTyCon :: TyCon -> Bool
+isEnumerationTyCon (AlgTyCon {algTyConFlavour = EnumTyCon}) = True
+isEnumerationTyCon other = False
--- The unit tycon isn't classed as a tuple tycon
-isTupleTyCon (TupleTyCon {tyConArity = arity, tyConBoxed = True}) = arity >= 2
-isTupleTyCon other = False
+isTupleTyCon :: TyCon -> Bool
+-- The unit tycon didn't used to be classed as a tuple tycon
+-- but I thought that was silly so I've undone it
+-- If it can't be for some reason, it should be a AlgTyCon
+isTupleTyCon (TupleTyCon {}) = True
+isTupleTyCon other = False
-isUnboxedTupleTyCon (TupleTyCon {tyConBoxed = False}) = True
+isUnboxedTupleTyCon :: TyCon -> Bool
+isUnboxedTupleTyCon (TupleTyCon {tyConBoxed = boxity}) = not (isBoxed boxity)
isUnboxedTupleTyCon other = False
+
+isBoxedTupleTyCon :: TyCon -> Bool
+isBoxedTupleTyCon (TupleTyCon {tyConBoxed = boxity}) = isBoxed boxity
+isBoxedTupleTyCon other = False
+
+tupleTyConBoxity tc = tyConBoxed tc
+
+isRecursiveTyCon :: TyCon -> Bool
+isRecursiveTyCon (AlgTyCon {algTyConRec = Recursive}) = True
+isRecursiveTyCon other = False
+
+isForeignTyCon :: TyCon -> Bool
+-- isForeignTyCon identifies foreign-imported type constructors
+-- For the moment, they are primitive but lifted, but that may change
+isForeignTyCon (PrimTyCon {isUnLifted = is_unlifted}) = not is_unlifted
+isForeignTyCon other = 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 (AlgTyCon {dataCons = cons}) = cons
-tyConDataCons (TupleTyCon {dataCon = con}) = [con]
-tyConDataCons 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.
+-- It's convenient for tyConDataCons to return the
+-- empty list for type synonyms etc
+tyConDataCons tycon = tyConDataCons_maybe tycon `orElse` []
+
+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 {dataCons = cons}) = length cons
-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
-tyConPrimRep :: TyCon -> PrimRep
-tyConPrimRep (PrimTyCon {primTyConRep = rep}) = rep
-tyConPrimRep _ = PtrRep
+tyConSelIds :: TyCon -> [Id]
+tyConSelIds (AlgTyCon {selIds = sels}) = sels
+tyConSelIds other_tycon = []
\end{code}
\begin{code}
-tyConDerivings :: TyCon -> [Class]
-tyConDerivings (AlgTyCon {dataTyConDerivings = derivs}) = derivs
-tyConDerivings other = []
+newTyConRep :: TyCon -> ([TyVar], Type)
+newTyConRep (AlgTyCon {tyConTyVars = tvs, algTyConFlavour = NewTyCon rep}) = (tvs, rep)
+
+tyConPrimRep :: TyCon -> PrimRep
+tyConPrimRep (PrimTyCon {primTyConRep = rep}) = rep
+tyConPrimRep tc = ASSERT( not (isUnboxedTupleTyCon tc) )
+ PtrRep
+ -- We should not be asking what the representation of an
+ -- unboxed tuple is, because it isn't a first class value.
\end{code}
\begin{code}
-tyConTheta :: TyCon -> [(Class, [Type])]
-tyConTheta (AlgTyCon {dataTyConTheta = theta}) = theta
--- should ask about anything else
+tyConTheta :: TyCon -> [PredType]
+tyConTheta (AlgTyCon {algTyConTheta = theta}) = theta
+tyConTheta (TupleTyCon {}) = []
+-- shouldn't ask about anything else
\end{code}
@tyConArgVrcs_maybe@ gives a list of (occPos,occNeg) flags, one for
tyConArgVrcs_maybe :: TyCon -> Maybe ArgVrcs
tyConArgVrcs_maybe (FunTyCon {} ) = Just [(False,True),(True,False)]
-tyConArgVrcs_maybe (AlgTyCon {dataTyConArgVrcs = oi}) = Just oi
-tyConArgVrcs_maybe (PrimTyCon {primTyConArgVrcs = oi}) = Just oi
+tyConArgVrcs_maybe (AlgTyCon {tyConArgVrcs = oi}) = Just oi
+tyConArgVrcs_maybe (PrimTyCon {tyConArgVrcs = oi}) = Just oi
tyConArgVrcs_maybe (TupleTyCon {tyConArity = arity }) = Just (replicate arity (True,False))
-tyConArgVrcs_maybe (SynTyCon {synTyConArgVrcs = oi }) = Just oi
+tyConArgVrcs_maybe (SynTyCon {tyConArgVrcs = oi }) = Just oi
tyConArgVrcs_maybe _ = Nothing
\end{code}
\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}
+isClassTyCon :: TyCon -> Bool
+isClassTyCon (AlgTyCon {algTyConClass = Just _}) = True
+isClassTyCon other_tycon = False
+
tyConClass_maybe :: TyCon -> Maybe Class
-tyConClass_maybe (AlgTyCon {dataTyConClass_maybe = maybe_cls}) = maybe_cls
-tyConClass_maybe other_tycon = Nothing
+tyConClass_maybe (AlgTyCon {algTyConClass = maybe_clas}) = maybe_clas
+tyConClass_maybe ther_tycon = Nothing
\end{code}
getUnique tc = tyConUnique tc
instance Outputable TyCon where
- ppr tc = ppr (getName tc)
+ ppr tc = ppr (getName tc)
instance NamedThing TyCon where
getName = tyConName
uniq1 = tyConUnique tc1
uniq2 = tyConUnique tc2
\end{code}
+
+
+
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