module TysPrim where
-import Ubiq
+IMP_Ubiq(){-uitous-}
-import Kind ( mkUnboxedTypeKind, mkBoxedTypeKind )
-import Name ( mkBuiltinName )
-import PrelMods ( pRELUDE_BUILTIN )
+import Kind ( mkUnboxedTypeKind, mkBoxedTypeKind, mkTypeKind, mkArrowKind )
+import Name ( mkWiredInTyConName )
import PrimRep ( PrimRep(..) ) -- getPrimRepInfo uses PrimRep repn
-import TyCon ( mkPrimTyCon, mkDataTyCon, NewOrData(..) )
+import TyCon ( mkPrimTyCon, mkDataTyCon, TyCon )
+import BasicTypes ( NewOrData(..) )
+import Type ( applyTyCon, mkTyVarTys, mkTyConTy, SYN_IE(Type) )
import TyVar ( GenTyVar(..), alphaTyVars )
-import Type ( applyTyCon, mkTyVarTys )
import Usage ( usageOmega )
+import PrelMods ( gHC__ )
import Unique
-
\end{code}
\begin{code}
\begin{code}
-- only used herein
-pcPrimTyCon :: Unique{-TyConKey-} -> FAST_STRING
- -> Int -> ([PrimRep] -> PrimRep) -> TyCon
-pcPrimTyCon key str arity{-UNUSED-} kind_fn{-UNUSED-}
- = mkPrimTyCon name mkUnboxedTypeKind
+pcPrimTyCon :: Unique{-TyConKey-} -> FAST_STRING -> Int -> PrimRep -> TyCon
+
+pcPrimTyCon key str arity primrep
+ = the_tycon
where
- name = mkBuiltinName key pRELUDE_BUILTIN str
+ name = mkWiredInTyConName key gHC__ str the_tycon
+ the_tycon = mkPrimTyCon name arity primrep
charPrimTy = applyTyCon charPrimTyCon []
-charPrimTyCon = pcPrimTyCon charPrimTyConKey SLIT("Char#") 0 (\ [] -> CharRep)
+charPrimTyCon = pcPrimTyCon charPrimTyConKey SLIT("Char#") 0 CharRep
intPrimTy = applyTyCon intPrimTyCon []
-intPrimTyCon = pcPrimTyCon intPrimTyConKey SLIT("Int#") 0 (\ [] -> IntRep)
+intPrimTyCon = pcPrimTyCon intPrimTyConKey SLIT("Int#") 0 IntRep
wordPrimTy = applyTyCon wordPrimTyCon []
-wordPrimTyCon = pcPrimTyCon wordPrimTyConKey SLIT("Word#") 0 (\ [] -> WordRep)
+wordPrimTyCon = pcPrimTyCon wordPrimTyConKey SLIT("Word#") 0 WordRep
addrPrimTy = applyTyCon addrPrimTyCon []
-addrPrimTyCon = pcPrimTyCon addrPrimTyConKey SLIT("Addr#") 0 (\ [] -> AddrRep)
+addrPrimTyCon = pcPrimTyCon addrPrimTyConKey SLIT("Addr#") 0 AddrRep
floatPrimTy = applyTyCon floatPrimTyCon []
-floatPrimTyCon = pcPrimTyCon floatPrimTyConKey SLIT("Float#") 0 (\ [] -> FloatRep)
+floatPrimTyCon = pcPrimTyCon floatPrimTyConKey SLIT("Float#") 0 FloatRep
doublePrimTy = applyTyCon doublePrimTyCon []
-doublePrimTyCon = pcPrimTyCon doublePrimTyConKey SLIT("Double#") 0 (\ [] -> DoubleRep)
+doublePrimTyCon = pcPrimTyCon doublePrimTyConKey SLIT("Double#") 0 DoubleRep
\end{code}
@PrimitiveKinds@ are used in @PrimitiveOps@, for which we often need
%************************************************************************
%* *
-\subsection[TysPrim-void]{The @Void#@ type}
+\subsection[TysPrim-state]{The @State#@ type (and @_RealWorld@ types)}
%* *
%************************************************************************
-Very similar to the @State#@ type.
-\begin{code}
-voidPrimTy = applyTyCon voidPrimTyCon []
- where
- voidPrimTyCon = pcPrimTyCon voidPrimTyConKey SLIT("Void#") 0
- (\ [] -> VoidRep)
-\end{code}
+State# is the primitive, unboxed type of states. It has one type parameter,
+thus
+ State# RealWorld
+or
+ State# s
-%************************************************************************
-%* *
-\subsection[TysPrim-state]{The @State#@ type (and @_RealWorld@ types)}
-%* *
-%************************************************************************
+where s is a type variable. The only purpose of the type parameter is to
+keep different state threads separate. It is represented by nothing at all.
\begin{code}
mkStatePrimTy ty = applyTyCon statePrimTyCon [ty]
-statePrimTyCon = pcPrimTyCon statePrimTyConKey SLIT("State#") 1
- (\ [s_kind] -> VoidRep)
+statePrimTyCon = pcPrimTyCon statePrimTyConKey SLIT("State#") 1 VoidRep
\end{code}
@_RealWorld@ is deeply magical. It {\em is primitive}, but it
{\em is not unboxed}.
-\begin{code}
-realWorldTy = applyTyCon realWorldTyCon []
-realWorldTyCon
- = mkDataTyCon name mkBoxedTypeKind
- [{-no tyvars-}]
- [{-no context-}]
- [{-no data cons!-}] -- we tell you *nothing* about this guy
- [{-no derivings-}]
- DataType
- where
- name = mkBuiltinName realWorldTyConKey pRELUDE_BUILTIN SLIT("_RealWorld")
+We never manipulate values of type RealWorld; it's only used in the type
+system, to parameterise State#.
+\begin{code}
+realWorldTy = applyTyCon realWorldTyCon []
+realWorldTyCon = mk_no_constr_tycon realWorldTyConKey SLIT("RealWorld")
realWorldStatePrimTy = mkStatePrimTy realWorldTy
\end{code}
Note: the ``state-pairing'' types are not truly primitive, so they are
defined in \tr{TysWiredIn.lhs}, not here.
+\begin{code}
+-- The Void type is represented as a data type with no constructors
+-- It's a built in type (i.e. there's no way to define it in Haskell;
+-- the nearest would be
+--
+-- data Void = -- No constructors!
+--
+-- ) It's boxed; there is only one value of this
+-- type, namely "void", whose semantics is just bottom.
+voidTy = mkTyConTy voidTyCon
+voidTyCon = mk_no_constr_tycon voidTyConKey SLIT("Void")
+\end{code}
+
+\begin{code}
+mk_no_constr_tycon key str
+ = the_tycon
+ where
+ name = mkWiredInTyConName key gHC__ str the_tycon
+ the_tycon = mkDataTyCon name mkBoxedTypeKind
+ [{-no tyvars-}]
+ [{-no context-}]
+ [{-no data cons!-}] -- we tell you *nothing* about this guy
+ [{-no derivings-}]
+ DataType
+\end{code}
+
%************************************************************************
%* *
\subsection[TysPrim-arrays]{The primitive array types}
%************************************************************************
\begin{code}
-arrayPrimTyCon = pcPrimTyCon arrayPrimTyConKey SLIT("Array#") 1
- (\ [elt_kind] -> ArrayRep)
+arrayPrimTyCon = pcPrimTyCon arrayPrimTyConKey SLIT("Array#") 1 ArrayRep
-byteArrayPrimTyCon = pcPrimTyCon byteArrayPrimTyConKey SLIT("ByteArray#") 0
- (\ [] -> ByteArrayRep)
+byteArrayPrimTyCon = pcPrimTyCon byteArrayPrimTyConKey SLIT("ByteArray#") 0 ByteArrayRep
-mutableArrayPrimTyCon = pcPrimTyCon mutableArrayPrimTyConKey SLIT("MutableArray#") 2
- (\ [s_kind, elt_kind] -> ArrayRep)
+mutableArrayPrimTyCon = pcPrimTyCon mutableArrayPrimTyConKey SLIT("MutableArray#") 2 ArrayRep
-mutableByteArrayPrimTyCon = pcPrimTyCon mutableByteArrayPrimTyConKey SLIT("MutableByteArray#") 1
- (\ [s_kind] -> ByteArrayRep)
+mutableByteArrayPrimTyCon = pcPrimTyCon mutableByteArrayPrimTyConKey SLIT("MutableByteArray#") 1 ByteArrayRep
mkArrayPrimTy elt = applyTyCon arrayPrimTyCon [elt]
byteArrayPrimTy = applyTyCon byteArrayPrimTyCon []
%************************************************************************
\begin{code}
-synchVarPrimTyCon = pcPrimTyCon synchVarPrimTyConKey SLIT("SynchVar#") 2
- (\ [s_kind, elt_kind] -> PtrRep)
+synchVarPrimTyCon = pcPrimTyCon synchVarPrimTyConKey SLIT("SynchVar#") 2 PtrRep
mkSynchVarPrimTy s elt = applyTyCon synchVarPrimTyCon [s, elt]
\end{code}
%************************************************************************
\begin{code}
-stablePtrPrimTyCon = pcPrimTyCon stablePtrPrimTyConKey SLIT("StablePtr#") 1
- (\ [elt_kind] -> StablePtrRep)
+stablePtrPrimTyCon = pcPrimTyCon stablePtrPrimTyConKey SLIT("StablePtr#") 1 StablePtrRep
mkStablePtrPrimTy ty = applyTyCon stablePtrPrimTyCon [ty]
\end{code}
\begin{code}
foreignObjPrimTy = applyTyCon foreignObjPrimTyCon []
-foreignObjPrimTyCon = pcPrimTyCon foreignObjPrimTyConKey SLIT("ForeignObj#") 0
- (\ [] -> ForeignObjRep)
+foreignObjPrimTyCon = pcPrimTyCon foreignObjPrimTyConKey SLIT("ForeignObj#") 0 ForeignObjRep
\end{code}
projects / ghc-hetmet.git / blobdiff