%
\section[TysWiredIn]{Wired-in knowledge about {\em non-primitive} types}
-This module is about types that can be defined in Haskell, but which
-must be wired into the compiler nonetheless.
-
-This module tracks the ``state interface'' document, ``GHC prelude:
-types and operations.''
-
\begin{code}
+-- | This module is about types that can be defined in Haskell, but which
+-- must be wired into the compiler nonetheless. C.f module TysPrim
module TysWiredIn (
+ -- * All wired in things
wiredInTyCons,
+ -- * Bool
boolTy, boolTyCon, boolTyCon_RDR, boolTyConName,
trueDataCon, trueDataConId, true_RDR,
falseDataCon, falseDataConId, false_RDR,
+ -- * Char
charTyCon, charDataCon, charTyCon_RDR,
charTy, stringTy, charTyConName,
-
+ -- * Double
doubleTyCon, doubleDataCon, doubleTy, doubleTyConName,
+ -- * Float
floatTyCon, floatDataCon, floatTy, floatTyConName,
+ -- * Int
intTyCon, intDataCon, intTyCon_RDR, intDataCon_RDR, intTyConName,
intTy,
+ -- * Word
+ wordTyCon, wordDataCon, wordTyConName, wordTy,
+
+ -- * List
listTyCon, nilDataCon, consDataCon,
listTyCon_RDR, consDataCon_RDR, listTyConName,
mkListTy,
- -- tuples
- mkTupleTy,
+ -- * Tuples
+ mkTupleTy, mkBoxedTupleTy,
tupleTyCon, tupleCon,
unitTyCon, unitDataCon, unitDataConId, pairTyCon,
unboxedSingletonTyCon, unboxedSingletonDataCon,
unboxedPairTyCon, unboxedPairDataCon,
-
- boxedTupleArr, unboxedTupleArr,
+ -- * Unit
unitTy,
- -- parallel arrays
+ -- * Parallel arrays
mkPArrTy,
parrTyCon, parrFakeCon, isPArrTyCon, isPArrFakeCon,
parrTyCon_RDR, parrTyConName
-- others:
import Constants ( mAX_TUPLE_SIZE )
import Module ( Module )
-import RdrName ( nameRdrName )
-import Name ( Name, BuiltInSyntax(..), nameUnique, nameOccName,
- nameModule, mkWiredInName )
-import OccName ( mkOccNameFS, tcName, dataName, mkTupleOcc,
- mkDataConWorkerOcc )
+import RdrName
+import Name
import DataCon ( DataCon, mkDataCon, dataConWorkId, dataConSourceArity )
-import Var ( TyVar, tyVarKind )
+import Var
import TyCon ( TyCon, AlgTyConRhs(DataTyCon), tyConDataCons,
mkTupleTyCon, mkAlgTyCon, tyConName,
TyConParent(NoParentTyCon) )
import TypeRep ( mkArrowKinds, liftedTypeKind, ubxTupleKind )
import Unique ( incrUnique, mkTupleTyConUnique,
mkTupleDataConUnique, mkPArrDataConUnique )
-import Array
+import Data.Array
import FastString
import Outputable
+alpha_tyvar :: [TyVar]
alpha_tyvar = [alphaTyVar]
-alpha_ty = [alphaTy]
+
+alpha_ty :: [Type]
+alpha_ty = [alphaTy]
\end{code}
\begin{code}
mkWiredInTyConName :: BuiltInSyntax -> Module -> FastString -> Unique -> TyCon -> Name
-mkWiredInTyConName built_in mod fs uniq tycon
- = mkWiredInName mod (mkOccNameFS tcName fs) uniq
+mkWiredInTyConName built_in modu fs unique tycon
+ = mkWiredInName modu (mkTcOccFS fs) unique
(ATyCon tycon) -- Relevant TyCon
built_in
mkWiredInDataConName :: BuiltInSyntax -> Module -> FastString -> Unique -> DataCon -> Name
-mkWiredInDataConName built_in mod fs uniq datacon
- = mkWiredInName mod (mkOccNameFS dataName fs) uniq
+mkWiredInDataConName built_in modu fs unique datacon
+ = mkWiredInName modu (mkDataOccFS fs) unique
(ADataCon datacon) -- Relevant DataCon
built_in
-charTyConName = mkWiredInTyConName UserSyntax gHC_BASE FSLIT("Char") charTyConKey charTyCon
-charDataConName = mkWiredInDataConName UserSyntax gHC_BASE FSLIT("C#") charDataConKey charDataCon
-intTyConName = mkWiredInTyConName UserSyntax gHC_BASE FSLIT("Int") intTyConKey intTyCon
-intDataConName = mkWiredInDataConName UserSyntax gHC_BASE FSLIT("I#") intDataConKey intDataCon
-
-boolTyConName = mkWiredInTyConName UserSyntax gHC_BASE FSLIT("Bool") boolTyConKey boolTyCon
-falseDataConName = mkWiredInDataConName UserSyntax gHC_BASE FSLIT("False") falseDataConKey falseDataCon
-trueDataConName = mkWiredInDataConName UserSyntax gHC_BASE FSLIT("True") trueDataConKey trueDataCon
-listTyConName = mkWiredInTyConName BuiltInSyntax gHC_BASE FSLIT("[]") listTyConKey listTyCon
-nilDataConName = mkWiredInDataConName BuiltInSyntax gHC_BASE FSLIT("[]") nilDataConKey nilDataCon
-consDataConName = mkWiredInDataConName BuiltInSyntax gHC_BASE FSLIT(":") consDataConKey consDataCon
-
-floatTyConName = mkWiredInTyConName UserSyntax gHC_FLOAT FSLIT("Float") floatTyConKey floatTyCon
-floatDataConName = mkWiredInDataConName UserSyntax gHC_FLOAT FSLIT("F#") floatDataConKey floatDataCon
-doubleTyConName = mkWiredInTyConName UserSyntax gHC_FLOAT FSLIT("Double") doubleTyConKey doubleTyCon
-doubleDataConName = mkWiredInDataConName UserSyntax gHC_FLOAT FSLIT("D#") doubleDataConKey doubleDataCon
-
-parrTyConName = mkWiredInTyConName BuiltInSyntax gHC_PARR FSLIT("[::]") parrTyConKey parrTyCon
-parrDataConName = mkWiredInDataConName UserSyntax gHC_PARR FSLIT("PArr") parrDataConKey parrDataCon
-
+charTyConName, charDataConName, intTyConName, intDataConName :: Name
+charTyConName = mkWiredInTyConName UserSyntax gHC_TYPES (fsLit "Char") charTyConKey charTyCon
+charDataConName = mkWiredInDataConName UserSyntax gHC_TYPES (fsLit "C#") charDataConKey charDataCon
+intTyConName = mkWiredInTyConName UserSyntax gHC_TYPES (fsLit "Int") intTyConKey intTyCon
+intDataConName = mkWiredInDataConName UserSyntax gHC_TYPES (fsLit "I#") intDataConKey intDataCon
+
+boolTyConName, falseDataConName, trueDataConName :: Name
+boolTyConName = mkWiredInTyConName UserSyntax gHC_BOOL (fsLit "Bool") boolTyConKey boolTyCon
+falseDataConName = mkWiredInDataConName UserSyntax gHC_BOOL (fsLit "False") falseDataConKey falseDataCon
+trueDataConName = mkWiredInDataConName UserSyntax gHC_BOOL (fsLit "True") trueDataConKey trueDataCon
+
+listTyConName, nilDataConName, consDataConName :: Name
+listTyConName = mkWiredInTyConName BuiltInSyntax gHC_TYPES (fsLit "[]") listTyConKey listTyCon
+nilDataConName = mkWiredInDataConName BuiltInSyntax gHC_TYPES (fsLit "[]") nilDataConKey nilDataCon
+consDataConName = mkWiredInDataConName BuiltInSyntax gHC_TYPES (fsLit ":") consDataConKey consDataCon
+
+floatTyConName, floatDataConName, doubleTyConName, doubleDataConName :: Name
+floatTyConName = mkWiredInTyConName UserSyntax gHC_TYPES (fsLit "Float") floatTyConKey floatTyCon
+floatDataConName = mkWiredInDataConName UserSyntax gHC_TYPES (fsLit "F#") floatDataConKey floatDataCon
+doubleTyConName = mkWiredInTyConName UserSyntax gHC_TYPES (fsLit "Double") doubleTyConKey doubleTyCon
+doubleDataConName = mkWiredInDataConName UserSyntax gHC_TYPES (fsLit "D#") doubleDataConKey doubleDataCon
+
+parrTyConName, parrDataConName :: Name
+parrTyConName = mkWiredInTyConName BuiltInSyntax gHC_PARR (fsLit "[::]") parrTyConKey parrTyCon
+parrDataConName = mkWiredInDataConName UserSyntax gHC_PARR (fsLit "PArr") parrDataConKey parrDataCon
+
+boolTyCon_RDR, false_RDR, true_RDR, intTyCon_RDR, charTyCon_RDR,
+ intDataCon_RDR, listTyCon_RDR, consDataCon_RDR, parrTyCon_RDR:: RdrName
boolTyCon_RDR = nameRdrName boolTyConName
false_RDR = nameRdrName falseDataConName
true_RDR = nameRdrName trueDataConName
%************************************************************************
\begin{code}
+pcNonRecDataTyCon :: Name -> [TyVar] -> [DataCon] -> TyCon
pcNonRecDataTyCon = pcTyCon False NonRecursive
+pcRecDataTyCon :: Name -> [TyVar] -> [DataCon] -> TyCon
pcRecDataTyCon = pcTyCon False Recursive
+pcTyCon :: Bool -> RecFlag -> Name -> [TyVar] -> [DataCon] -> TyCon
pcTyCon is_enum is_rec name tyvars cons
= tycon
where
tyvars
[] -- No stupid theta
(DataTyCon cons is_enum)
- [] -- No record selectors
NoParentTyCon
is_rec
True -- All the wired-in tycons have generics
[] -- No existential type variables
[] -- No equality spec
[] -- No theta
- arg_tys tycon
+ arg_tys (mkTyConApp tycon (mkTyVarTys tyvars))
+ tycon
[] -- No stupid theta
(mkDataConIds bogus_wrap_name wrk_name data_con)
- mod = nameModule dc_name
+ modu = ASSERT( isExternalName dc_name )
+ nameModule dc_name
wrk_occ = mkDataConWorkerOcc (nameOccName dc_name)
wrk_key = incrUnique (nameUnique dc_name)
- wrk_name = mkWiredInName mod wrk_occ wrk_key
+ wrk_name = mkWiredInName modu wrk_occ wrk_key
(AnId (dataConWorkId data_con)) UserSyntax
bogus_wrap_name = pprPanic "Wired-in data wrapper id" (ppr dc_name)
-- Wired-in types are too simple to need wrappers
mk_tuple boxity arity = (tycon, tuple_con)
where
tycon = mkTupleTyCon tc_name tc_kind arity tyvars tuple_con boxity gen_info
- mod = mkTupleModule boxity arity
- tc_name = mkWiredInName mod (mkTupleOcc tcName boxity arity) tc_uniq
+ modu = mkTupleModule boxity arity
+ tc_name = mkWiredInName modu (mkTupleOcc tcName boxity arity) tc_uniq
(ATyCon tycon) BuiltInSyntax
tc_kind = mkArrowKinds (map tyVarKind tyvars) res_kind
res_kind | isBoxed boxity = liftedTypeKind
tuple_con = pcDataCon dc_name tyvars tyvar_tys tycon
tyvar_tys = mkTyVarTys tyvars
- dc_name = mkWiredInName mod (mkTupleOcc dataName boxity arity) dc_uniq
+ dc_name = mkWiredInName modu (mkTupleOcc dataName boxity arity) dc_uniq
(ADataCon tuple_con) BuiltInSyntax
tc_uniq = mkTupleTyConUnique boxity arity
dc_uniq = mkTupleDataConUnique boxity arity
gen_info = True -- Tuples all have generics..
-- hmm: that's a *lot* of code
+unitTyCon :: TyCon
unitTyCon = tupleTyCon Boxed 0
+unitDataCon :: DataCon
unitDataCon = head (tyConDataCons unitTyCon)
+unitDataConId :: Id
unitDataConId = dataConWorkId unitDataCon
+pairTyCon :: TyCon
pairTyCon = tupleTyCon Boxed 2
+unboxedSingletonTyCon :: TyCon
unboxedSingletonTyCon = tupleTyCon Unboxed 1
+unboxedSingletonDataCon :: DataCon
unboxedSingletonDataCon = tupleCon Unboxed 1
+unboxedPairTyCon :: TyCon
unboxedPairTyCon = tupleTyCon Unboxed 2
+unboxedPairDataCon :: DataCon
unboxedPairDataCon = tupleCon Unboxed 2
\end{code}
+
%************************************************************************
%* *
\subsection[TysWiredIn-boxed-prim]{The ``boxed primitive'' types (@Char@, @Int@, etc)}
%************************************************************************
\begin{code}
+charTy :: Type
charTy = mkTyConTy charTyCon
+charTyCon :: TyCon
charTyCon = pcNonRecDataTyCon charTyConName [] [charDataCon]
+charDataCon :: DataCon
charDataCon = pcDataCon charDataConName [] [charPrimTy] charTyCon
+stringTy :: Type
stringTy = mkListTy charTy -- convenience only
\end{code}
\begin{code}
+intTy :: Type
intTy = mkTyConTy intTyCon
+intTyCon :: TyCon
intTyCon = pcNonRecDataTyCon intTyConName [] [intDataCon]
+intDataCon :: DataCon
intDataCon = pcDataCon intDataConName [] [intPrimTy] intTyCon
\end{code}
\begin{code}
+wordTy :: Type
+wordTy = mkTyConTy wordTyCon
+
+wordTyCon :: TyCon
+wordTyCon = pcNonRecDataTyCon wordTyConName [] [wordDataCon]
+wordDataCon :: DataCon
+wordDataCon = pcDataCon wordDataConName [] [wordPrimTy] wordTyCon
+\end{code}
+
+\begin{code}
+floatTy :: Type
floatTy = mkTyConTy floatTyCon
+floatTyCon :: TyCon
floatTyCon = pcNonRecDataTyCon floatTyConName [] [floatDataCon]
+floatDataCon :: DataCon
floatDataCon = pcDataCon floatDataConName [] [floatPrimTy] floatTyCon
\end{code}
\begin{code}
+doubleTy :: Type
doubleTy = mkTyConTy doubleTyCon
-doubleTyCon = pcNonRecDataTyCon doubleTyConName [] [doubleDataCon]
-doubleDataCon = pcDataCon doubleDataConName [] [doublePrimTy] doubleTyCon
+doubleTyCon :: TyCon
+doubleTyCon = pcNonRecDataTyCon doubleTyConName [] [doubleDataCon]
+
+doubleDataCon :: DataCon
+doubleDataCon = pcDataCon doubleDataConName [] [doublePrimTy] doubleTyCon
\end{code}
{\em END IDLE SPECULATION BY SIMON}
\begin{code}
+boolTy :: Type
boolTy = mkTyConTy boolTyCon
+boolTyCon :: TyCon
boolTyCon = pcTyCon True NonRecursive boolTyConName
[] [falseDataCon, trueDataCon]
+falseDataCon, trueDataCon :: DataCon
falseDataCon = pcDataCon falseDataConName [] [] boolTyCon
trueDataCon = pcDataCon trueDataConName [] [] boolTyCon
+falseDataConId, trueDataConId :: Id
falseDataConId = dataConWorkId falseDataCon
trueDataConId = dataConWorkId trueDataCon
\end{code}
mkListTy :: Type -> Type
mkListTy ty = mkTyConApp listTyCon [ty]
+listTyCon :: TyCon
listTyCon = pcRecDataTyCon listTyConName alpha_tyvar [nilDataCon, consDataCon]
+nilDataCon :: DataCon
nilDataCon = pcDataCon nilDataConName alpha_tyvar [] listTyCon
+
+consDataCon :: DataCon
consDataCon = pcDataConWithFixity True {- Declared infix -}
consDataConName
alpha_tyvar [alphaTy, mkTyConApp listTyCon alpha_ty] listTyCon
\end{itemize}
\begin{code}
-mkTupleTy :: Boxity -> Int -> [Type] -> Type
-mkTupleTy boxity arity tys = mkTyConApp (tupleTyCon boxity arity) tys
+mkTupleTy :: Boxity -> [Type] -> Type
+-- Special case for *boxed* 1-tuples, which are represented by the type itself
+mkTupleTy boxity [ty] | Boxed <- boxity = ty
+mkTupleTy boxity tys = mkTyConApp (tupleTyCon boxity (length tys)) tys
-unitTy = mkTupleTy Boxed 0 []
+-- | Build the type of a small tuple that holds the specified type of thing
+mkBoxedTupleTy :: [Type] -> Type
+mkBoxedTupleTy tys = mkTupleTy Boxed tys
+
+unitTy :: Type
+unitTy = mkTupleTy Boxed []
\end{code}
%************************************************************************
Special syntax for parallel arrays needs some wired in definitions.
\begin{code}
--- construct a type representing the application of the parallel array
--- constructor
---
+-- | Construct a type representing the application of the parallel array constructor
mkPArrTy :: Type -> Type
mkPArrTy ty = mkTyConApp parrTyCon [ty]
--- represents the type constructor of parallel arrays
+-- | Represents the type constructor of parallel arrays
--
--- * this must match the definition in `PrelPArr'
+-- * This must match the definition in @PrelPArr@
--
-- NB: Although the constructor is given here, it will not be accessible in
-- user code as it is not in the environment of any compiled module except
--- `PrelPArr'.
+-- @PrelPArr@.
--
parrTyCon :: TyCon
parrTyCon = pcNonRecDataTyCon parrTyConName alpha_tyvar [parrDataCon]
alpha_ty]
parrTyCon
--- check whether a type constructor is the constructor for parallel arrays
---
+-- | Check whether a type constructor is the constructor for parallel arrays
isPArrTyCon :: TyCon -> Bool
isPArrTyCon tc = tyConName tc == parrTyConName
--- fake array constructors
+-- | Fake array constructors
--
--- * these constructors are never really used to represent array values;
+-- * These constructors are never really used to represent array values;
-- however, they are very convenient during desugaring (and, in particular,
-- in the pattern matching compiler) to treat array pattern just like
-- yet another constructor pattern
tyvar = head alphaTyVars
tyvarTys = replicate arity $ mkTyVarTy tyvar
nameStr = mkFastString ("MkPArr" ++ show arity)
- name = mkWiredInName gHC_PARR (mkOccNameFS dataName nameStr) uniq
+ name = mkWiredInName gHC_PARR (mkDataOccFS nameStr) unique
(ADataCon data_con) UserSyntax
- uniq = mkPArrDataConUnique arity
+ unique = mkPArrDataConUnique arity
--- checks whether a data constructor is a fake constructor for parallel arrays
---
+-- | Checks whether a data constructor is a fake constructor for parallel arrays
isPArrFakeCon :: DataCon -> Bool
isPArrFakeCon dcon = dcon == parrFakeCon (dataConSourceArity dcon)
\end{code}
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