isTupleTyCon, isUnboxedTupleTyCon, isBoxedTupleTyCon, tupleTyConBoxity,
isRecursiveTyCon, newTyConRep,
+ mkForeignTyCon, isForeignTyCon,
+
mkAlgTyCon, --mkAlgTyCon,
mkClassTyCon,
mkFunTyCon,
mkPrimTyCon,
+ mkLiftedPrimTyCon,
mkTupleTyCon,
mkSynTyCon,
mkKindCon,
tyConTheta,
tyConPrimRep,
tyConArity,
- isClassTyCon,
+ isClassTyCon, tyConClass_maybe,
getSynTyConDefn,
maybeTyConSingleCon,
#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 ( ClassContext )
import Var ( TyVar, Id )
+import Class ( Class )
import BasicTypes ( Arity, RecFlag(..), Boxity(..),
isBoxed, EP(..) )
import Name ( Name, nameUnique, NamedThing(getName) )
import PrelNames ( Unique, Uniquable(..), anyBoxConKey )
import PrimRep ( PrimRep(..), isFollowableRep )
import Outputable
+import FastString
\end{code}
%************************************************************************
tyConTyVars :: [TyVar],
tyConArgVrcs :: ArgVrcs,
- algTyConTheta :: ClassContext,
+ algTyConTheta :: [PredType],
dataCons :: [DataCon],
-- Its data constructors, with fully polymorphic types
-- e.g. the TyCon for a Class dictionary,
-- and TyCons with unboxed arguments
- algTyConClass :: Bool -- True if this tycon comes 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
- -- 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,
tyConArgVrcs :: ArgVrcs,
- primTyConRep :: PrimRep
+ 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 {
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 has explicit for-alls for the tyvars of
- -- the TyCon. Thus:
+ -- The rep type has free type variables the tyConTyVars
+ -- Thus:
-- newtype T a = MkT [(a,Int)]
- -- The rep type is forall a. [(a,Int)]
+ -- The rep type is [(a,Int)]
--
-- The rep type isn't entirely simple:
-- for a recursive newtype we pick () as the rep type
dataCons = cons,
selIds = sels,
noOfDataCons = ncons,
- algTyConClass = False,
+ algTyConClass = Nothing,
algTyConFlavour = flavour,
algTyConRec = rec,
genInfo = gen_info
}
-mkClassTyCon name kind tyvars argvrcs con clas flavour
+mkClassTyCon name kind tyvars argvrcs con clas flavour rec
= AlgTyCon {
tyConName = name,
tyConUnique = nameUnique name,
dataCons = [con],
selIds = [],
noOfDataCons = 1,
- algTyConClass = True,
+ algTyConClass = Just clas,
algTyConFlavour = flavour,
- algTyConRec = NonRecursive,
+ algTyConRec = rec,
genInfo = Nothing
}
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,
+ tyConName = name,
+ tyConUnique = nameUnique name,
+ tyConKind = kind,
+ tyConArity = arity,
tyConArgVrcs = arg_vrcs,
- primTyConRep = rep
+ 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
isPrimTyCon (PrimTyCon {}) = True
isPrimTyCon _ = False
-isUnLiftedTyCon (PrimTyCon {}) = True
-isUnLiftedTyCon (TupleTyCon { tyConBoxed = boxity}) = not (isBoxed boxity)
-isUnLiftedTyCon _ = False
+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 (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
- NewTyCon _ -> False
- other -> True
+-- 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, algTyConRec = is_rec})
+ = case new_or_data of
+ NewTyCon _ -> False
+ other -> True
+
isDataTyCon (TupleTyCon {tyConBoxed = boxity}) = isBoxed boxity
isDataTyCon other = False
isNewTyCon (AlgTyCon {algTyConFlavour = NewTyCon _}) = True
isNewTyCon other = False
-newTyConRep (AlgTyCon {algTyConFlavour = NewTyCon rep}) = Just rep
-newTyConRep other = Nothing
+newTyConRep :: TyCon -> ([TyVar], Type)
+newTyConRep (AlgTyCon {tyConTyVars = tvs, algTyConFlavour = NewTyCon rep}) = (tvs, rep)
-- A "product" tycon
-- has *one* constructor,
isRecursiveTyCon (AlgTyCon {algTyConRec = Recursive}) = True
isRecursiveTyCon other = False
+
+-- 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}
tyConDataCons :: TyCon -> [DataCon]
-tyConDataCons tycon = ASSERT2( not (null cons), ppr tycon )
- ASSERT2( length cons == tyConFamilySize tycon, ppr tycon )
+tyConDataCons tycon = ASSERT2( length cons == tyConFamilySize tycon, ppr tycon )
cons
where
cons = tyConDataConsIfAvailable tycon
\end{code}
\begin{code}
-tyConTheta :: TyCon -> ClassContext
+tyConTheta :: TyCon -> [PredType]
tyConTheta (AlgTyCon {algTyConTheta = theta}) = theta
-- should ask about anything else
\end{code}
\begin{code}
isClassTyCon :: TyCon -> Bool
-isClassTyCon (AlgTyCon {algTyConClass = is_class_tycon}) = is_class_tycon
-isClassTyCon other_tycon = False
+isClassTyCon (AlgTyCon {algTyConClass = Just _}) = True
+isClassTyCon other_tycon = False
+
+tyConClass_maybe :: TyCon -> Maybe Class
+tyConClass_maybe (AlgTyCon {algTyConClass = maybe_clas}) = maybe_clas
+tyConClass_maybe ther_tycon = Nothing
\end{code}
projects / ghc-hetmet.git / blobdiff