-- ** Derived 'OccName's
isDerivedOccName,
- mkDataConWrapperOcc, mkWorkerOcc, mkDefaultMethodOcc,
+ mkDataConWrapperOcc, mkWorkerOcc, mkDefaultMethodOcc, mkGenDefMethodOcc,
mkDerivedTyConOcc, mkNewTyCoOcc, mkClassOpAuxOcc,
mkCon2TagOcc, mkTag2ConOcc, mkMaxTagOcc,
mkClassTyConOcc, mkClassDataConOcc, mkDictOcc, mkIPOcc,
mkSpecOcc, mkForeignExportOcc, mkGenOcc1, mkGenOcc2,
+ mkGenD, mkGenC, mkGenS, mkGenR0, mkGenR0Co,
mkDataTOcc, mkDataCOcc, mkDataConWorkerOcc,
mkSuperDictSelOcc, mkLocalOcc, mkMethodOcc, mkInstTyTcOcc,
mkInstTyCoOcc, mkEqPredCoOcc,
\end{code}
\begin{code}
-mkDataConWrapperOcc, mkWorkerOcc, mkDefaultMethodOcc, mkDerivedTyConOcc,
- mkClassTyConOcc, mkClassDataConOcc, mkDictOcc, mkIPOcc,
- mkSpecOcc, mkForeignExportOcc, mkGenOcc1, mkGenOcc2,
+mkDataConWrapperOcc, mkWorkerOcc, mkDefaultMethodOcc, mkGenDefMethodOcc,
+ mkDerivedTyConOcc, mkClassTyConOcc, mkClassDataConOcc, mkDictOcc,
+ mkIPOcc, mkSpecOcc, mkForeignExportOcc, mkGenOcc1, mkGenOcc2,
+ mkGenD, mkGenR0, mkGenR0Co,
mkDataTOcc, mkDataCOcc, mkDataConWorkerOcc, mkNewTyCoOcc,
mkInstTyCoOcc, mkEqPredCoOcc, mkClassOpAuxOcc,
mkCon2TagOcc, mkTag2ConOcc, mkMaxTagOcc,
mkDataConWrapperOcc = mk_simple_deriv varName "$W"
mkWorkerOcc = mk_simple_deriv varName "$w"
mkDefaultMethodOcc = mk_simple_deriv varName "$dm"
+mkGenDefMethodOcc = mk_simple_deriv varName "$gdm"
mkClassOpAuxOcc = mk_simple_deriv varName "$c"
mkDerivedTyConOcc = mk_simple_deriv tcName ":" -- The : prefix makes sure it classifies
mkClassTyConOcc = mk_simple_deriv tcName "T:" -- as a tycon/datacon
mkTag2ConOcc = mk_simple_deriv varName "$tag2con_"
mkMaxTagOcc = mk_simple_deriv varName "$maxtag_"
--- Generic derivable classes
+-- Generic derivable classes (old)
mkGenOcc1 = mk_simple_deriv varName "$gfrom"
mkGenOcc2 = mk_simple_deriv varName "$gto"
+-- Generic deriving mechanism (new)
+mkGenD = mk_simple_deriv tcName "D1"
+mkGenC occ m = mk_deriv tcName ("C1_" ++ show m) (occNameString occ)
+mkGenS occ m n = mk_deriv tcName ("S1_" ++ show m ++ "_" ++ show n)
+ (occNameString occ)
+
+mkGenR0 = mk_simple_deriv tcName "Rep0_"
+mkGenR0Co = mk_simple_deriv tcName "CoRep0_"
+
-- data T = MkT ... deriving( Data ) needs defintions for
-- $tT :: Data.Generics.Basics.DataType
-- $cMkT :: Data.Generics.Basics.Constr
-- Singleton => Ok
-- Empty => Too hard, signature ignored
rep_sig (L loc (TypeSig nm ty)) = rep_proto nm ty loc
+rep_sig (L loc (GenericSig nm ty)) = rep_proto nm ty loc -- JPM: ?
rep_sig (L loc (InlineSig nm ispec)) = rep_inline nm ispec loc
rep_sig (L loc (SpecSig nm ty ispec)) = rep_specialise nm ty ispec loc
rep_sig _ = return []
-- f :: Num a => a -> a
TypeSig (Located name) (LHsType name)
+ -- A type signature for a generic function inside a class
+ -- generic eq :: (Representable0 a, GEq (Rep0 a)) => a -> a -> Bool
+ | GenericSig (Located name) (LHsType name)
+
-- A type signature in generated code, notably the code
-- generated for record selectors. We simply record
-- the desired Id itself, replete with its name, type
okBindSig _ = True
okHsBootSig :: Sig a -> Bool
-okHsBootSig (TypeSig _ _) = True
-okHsBootSig (FixSig _) = True
-okHsBootSig _ = False
+okHsBootSig (TypeSig _ _) = True
+okHsBootSig (GenericSig _ _) = True -- JPM: Is this true?
+okHsBootSig (FixSig _) = True
+okHsBootSig _ = False
okClsDclSig :: Sig a -> Bool
okClsDclSig (SpecInstSig _) = False
okClsDclSig _ = True -- All others OK
okInstDclSig :: Sig a -> Bool
-okInstDclSig (TypeSig _ _) = False
-okInstDclSig (FixSig _) = False
-okInstDclSig _ = True
+okInstDclSig (TypeSig _ _) = False
+okInstDclSig (GenericSig _ _) = False
+okInstDclSig (FixSig _) = False
+okInstDclSig _ = True
sigForThisGroup :: NameSet -> LSig Name -> Bool
sigForThisGroup ns sig
isVanillaLSig _ = False
isTypeLSig :: LSig name -> Bool -- Type signatures
-isTypeLSig (L _(TypeSig {})) = True
-isTypeLSig (L _(IdSig {})) = True
-isTypeLSig _ = False
+isTypeLSig (L _(TypeSig {})) = True
+isTypeLSig (L _(GenericSig {})) = True
+isTypeLSig (L _(IdSig {})) = True
+isTypeLSig _ = False
isSpecLSig :: LSig name -> Bool
isSpecLSig (L _(SpecSig {})) = True
hsSigDoc :: Sig name -> SDoc
hsSigDoc (TypeSig {}) = ptext (sLit "type signature")
+hsSigDoc (GenericSig {}) = ptext (sLit "generic default type signature")
hsSigDoc (IdSig {}) = ptext (sLit "id signature")
hsSigDoc (SpecSig {}) = ptext (sLit "SPECIALISE pragma")
hsSigDoc (InlineSig {}) = ptext (sLit "INLINE pragma")
eqHsSig (L _ (FixSig (FixitySig n1 _))) (L _ (FixSig (FixitySig n2 _))) = unLoc n1 == unLoc n2
eqHsSig (L _ (IdSig n1)) (L _ (IdSig n2)) = n1 == n2
eqHsSig (L _ (TypeSig n1 _)) (L _ (TypeSig n2 _)) = unLoc n1 == unLoc n2
+eqHsSig (L _ (GenericSig n1 _)) (L _ (GenericSig n2 _)) = unLoc n1 == unLoc n2
eqHsSig (L _ (InlineSig n1 _)) (L _ (InlineSig n2 _)) = unLoc n1 == unLoc n2
-- For specialisations, we don't have equality over
-- HsType, so it's not convenient to spot duplicate
ppr_sig :: OutputableBndr name => Sig name -> SDoc
ppr_sig (TypeSig var ty) = pprVarSig (unLoc var) (ppr ty)
+ppr_sig (GenericSig var ty) = ptext (sLit "generic") <+> pprVarSig (unLoc var) (ppr ty)
ppr_sig (IdSig id) = pprVarSig id (ppr (varType id))
ppr_sig (FixSig fix_sig) = ppr fix_sig
ppr_sig (SpecSig var ty inl) = pragBrackets (pprSpec var (ppr ty) inl)
nlHsDo, nlHsOpApp, nlHsLam, nlHsPar, nlHsIf, nlHsCase, nlList,
mkLHsTupleExpr, mkLHsVarTuple, missingTupArg,
- -- Bindigns
+ -- Bindings
mkFunBind, mkVarBind, mkHsVarBind, mk_easy_FunBind,
-- Literals
------------------------------------------------------
\begin{code}
-type TcMethInfo = (Name, DefMethSpec, Type) -- A temporary intermediate, to communicate
- -- between tcClassSigs and buildClass
+type TcMethInfo = (Name, DefMethSpec, Type)
+ -- A temporary intermediate, to communicate between tcClassSigs and
+ -- buildClass.
buildClass :: Bool -- True <=> do not include unfoldings
-- on dict selectors
mk_op_item rec_clas (op_name, dm_spec, _)
= do { dm_info <- case dm_spec of
NoDM -> return NoDefMeth
- GenericDM -> return GenDefMeth
+ GenericDM -> do { dm_name <- newImplicitBinder op_name mkGenDefMethodOcc
+ ; return (GenDefMeth dm_name) }
VanillaDM -> do { dm_name <- newImplicitBinder op_name mkDefaultMethodOcc
; return (DefMeth dm_name) }
; return (mkDictSelId no_unf op_name rec_clas, dm_info) }
(sel_tyvars, rho_ty) = splitForAllTys (idType sel_id)
op_ty = funResultTy rho_ty
- toDmSpec NoDefMeth = NoDM
- toDmSpec GenDefMeth = GenericDM
- toDmSpec (DefMeth _) = VanillaDM
+ toDmSpec NoDefMeth = NoDM
+ toDmSpec (GenDefMeth _) = GenericDM
+ toDmSpec (DefMeth _) = VanillaDM
toIfaceFD (tvs1, tvs2) = (map getFS tvs1, map getFS tvs2)
("InstType ", inst_type_ds),
("InstData ", inst_data_ds),
("TypeSigs ", bind_tys),
+ ("GenericSigs ", generic_sigs),
("ValBinds ", val_bind_ds),
("FunBinds ", fn_bind_ds),
("InlineMeths ", method_inlines),
trim ls = takeWhile (not.isSpace) (dropWhile isSpace ls)
- (fixity_sigs, bind_tys, bind_specs, bind_inlines)
+ (fixity_sigs, bind_tys, bind_specs, bind_inlines, generic_sigs)
= count_sigs [d | SigD d <- decls]
-- NB: this omits fixity decls on local bindings and
-- in class decls. ToDo
count_bind (FunBind {}) = (0,1)
count_bind b = pprPanic "count_bind: Unhandled binder" (ppr b)
- count_sigs sigs = foldr add4 (0,0,0,0) (map sig_info sigs)
+ count_sigs sigs = foldr add5 (0,0,0,0,0) (map sig_info sigs)
- sig_info (FixSig _) = (1,0,0,0)
- sig_info (TypeSig _ _) = (0,1,0,0)
- sig_info (SpecSig _ _ _) = (0,0,1,0)
- sig_info (InlineSig _ _) = (0,0,0,1)
- sig_info _ = (0,0,0,0)
+ sig_info (FixSig _) = (1,0,0,0,0)
+ sig_info (TypeSig _ _) = (0,1,0,0,0)
+ sig_info (SpecSig _ _ _) = (0,0,1,0,0)
+ sig_info (InlineSig _ _) = (0,0,0,1,0)
+ sig_info (GenericSig _ _) = (0,0,0,0,1)
+ sig_info _ = (0,0,0,0,0)
import_info (L _ (ImportDecl _ _ _ qual as spec))
= add6 (1, qual_info qual, as_info as, 0,0,0) (spec_info spec)
class_info decl@(ClassDecl {})
= case count_sigs (map unLoc (tcdSigs decl)) of
- (_,classops,_,_) ->
+ (_,classops,_,_,_) ->
(classops, addpr (foldr add2 (0,0) (map (count_bind.unLoc) (bagToList (tcdMeths decl)))))
class_info _ = (0,0)
inst_info (InstDecl _ inst_meths inst_sigs ats)
= case count_sigs (map unLoc inst_sigs) of
- (_,_,ss,is) ->
+ (_,_,ss,is,_) ->
case foldr add2 (0, 0) (map (countATDecl . unLoc) ats) of
(tyDecl, dtDecl) ->
(addpr (foldr add2 (0,0)
| ITderiving
| ITdo
| ITelse
+ | ITgeneric
| IThiding
| ITif
| ITimport
( "deriving", ITderiving, 0 ),
( "do", ITdo, 0 ),
( "else", ITelse, 0 ),
+ ( "generic", ITgeneric, bit genericsBit ),
( "hiding", IThiding, 0 ),
( "if", ITif, 0 ),
( "import", ITimport, 0 ),
-- integer
genericsBit :: Int
-genericsBit = 0 -- {| and |}
+genericsBit = 0 -- {|, |} and "generic"
ffiBit :: Int
ffiBit = 1
parrBit :: Int
'deriving' { L _ ITderiving }
'do' { L _ ITdo }
'else' { L _ ITelse }
+ 'generic' { L _ ITgeneric }
'hiding' { L _ IThiding }
'if' { L _ ITif }
'import' { L _ ITimport }
: '|' guardquals '=' exp { sL (comb2 $1 $>) $ GRHS (unLoc $2) $4 }
sigdecl :: { Located (OrdList (LHsDecl RdrName)) }
- : infixexp '::' sigtypedoc {% do s <- checkValSig $1 $3
- ; return (LL $ unitOL (LL $ SigD s)) }
- -- See Note [Declaration/signature overlap] for why we need infixexp here
+ : 'generic' infixexp '::' sigtypedoc
+ {% do (TypeSig l ty) <- checkValSig $2 $4
+ ; return (LL $ unitOL (LL $ SigD (GenericSig l ty))) }
+ -- See Note [Declaration/signature overlap] for why we need infixexp here
+ | infixexp '::' sigtypedoc
+ {% do s <- checkValSig $1 $3
+ ; return (LL $ unitOL (LL $ SigD s)) }
| var ',' sig_vars '::' sigtypedoc
{ LL $ toOL [ LL $ SigD (TypeSig n $5) | n <- $1 : unLoc $3 ] }
| infix prec ops { LL $ toOL [ LL $ SigD (FixSig (FixitySig n (Fixity $2 (unLoc $1))))
ppr lhs <+> text "::" <+> ppr ty)
$$ text hint)
where
- hint = if looks_like_foreign lhs
+ hint = if foreign_RDR `looks_like` lhs
then "Perhaps you meant to use -XForeignFunctionInterface?"
- else "Should be of form <variable> :: <type>"
+ else if generic_RDR `looks_like` lhs
+ then "Perhaps you meant to use -XGenerics?"
+ else "Should be of form <variable> :: <type>"
-- A common error is to forget the ForeignFunctionInterface flag
-- so check for that, and suggest. cf Trac #3805
-- Sadly 'foreign import' still barfs 'parse error' because 'import' is a keyword
- looks_like_foreign (L _ (HsVar v)) = v == foreign_RDR
- looks_like_foreign (L _ (HsApp lhs _)) = looks_like_foreign lhs
- looks_like_foreign _ = False
+ looks_like s (L _ (HsVar v)) = v == s
+ looks_like s (L _ (HsApp lhs _)) = looks_like s lhs
+ looks_like s _ = False
foreign_RDR = mkUnqual varName (fsLit "foreign")
+ generic_RDR = mkUnqual varName (fsLit "generic")
checkDoAndIfThenElse :: LHsExpr RdrName
-> Bool
%* *
%************************************************************************
-This section tells what the compiler knows about the assocation of
+This section tells what the compiler knows about the association of
names with uniques. These ones are the *non* wired-in ones. The
wired in ones are defined in TysWiredIn etc.
-- dotnet interop
, objectTyConName, marshalObjectName, unmarshalObjectName
, marshalStringName, unmarshalStringName, checkDotnetResName
+
+ -- Generics
+ , rep0ClassName, rep1ClassName
+ , datatypeClassName, constructorClassName, selectorClassName
+
]
genericTyConNames :: [Name]
-genericTyConNames = [crossTyConName, plusTyConName, genUnitTyConName]
+genericTyConNames = [
+ -- Old stuff
+ crossTyConName, plusTyConName, genUnitTyConName,
+ -- New stuff
+ v1TyConName, u1TyConName, par1TyConName, rec1TyConName,
+ k1TyConName, m1TyConName, sumTyConName, prodTyConName,
+ compTyConName, rTyConName, pTyConName, dTyConName,
+ cTyConName, sTyConName, rec0TyConName, par0TyConName,
+ d1TyConName, c1TyConName, s1TyConName, noSelTyConName,
+ rep0TyConName, rep1TyConName
+ ]
-- Know names from the DPH package which vary depending on the selected DPH backend.
--
undefined_RDR :: RdrName
undefined_RDR = varQual_RDR gHC_ERR (fsLit "undefined")
+error_RDR :: RdrName
+error_RDR = varQual_RDR gHC_ERR (fsLit "error")
+
+-- Old Generics (constructors and functions)
crossDataCon_RDR, inlDataCon_RDR, inrDataCon_RDR, genUnitDataCon_RDR :: RdrName
crossDataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit ":*:")
inlDataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "Inl")
inrDataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "Inr")
genUnitDataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "Unit")
+-- Generics (constructors and functions)
+u1DataCon_RDR, par1DataCon_RDR, rec1DataCon_RDR,
+ k1DataCon_RDR, m1DataCon_RDR, l1DataCon_RDR, r1DataCon_RDR,
+ prodDataCon_RDR, comp1DataCon_RDR, from0_RDR, from1_RDR,
+ to0_RDR, to1_RDR, datatypeName_RDR, moduleName_RDR, conName_RDR,
+ conFixity_RDR, conIsRecord_RDR, conIsTuple_RDR,
+ noArityDataCon_RDR, arityDataCon_RDR,
+ prefixDataCon_RDR, infixDataCon_RDR, leftAssocDataCon_RDR,
+ rightAssocDataCon_RDR, notAssocDataCon_RDR :: RdrName
+
+--v1DataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "V1")
+u1DataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "U1")
+par1DataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "Par1")
+rec1DataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "Rec1")
+k1DataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "K1")
+m1DataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "M1")
+
+l1DataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "L1")
+r1DataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "R1")
+
+prodDataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit ":*:")
+comp1DataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "Comp1")
+
+from0_RDR = varQual_RDR gHC_GENERICS (fsLit "from0")
+from1_RDR = varQual_RDR gHC_GENERICS (fsLit "from1")
+to0_RDR = varQual_RDR gHC_GENERICS (fsLit "to0")
+to1_RDR = varQual_RDR gHC_GENERICS (fsLit "to1")
+
+datatypeName_RDR = varQual_RDR gHC_GENERICS (fsLit "datatypeName")
+moduleName_RDR = varQual_RDR gHC_GENERICS (fsLit "moduleName")
+selName_RDR = varQual_RDR gHC_GENERICS (fsLit "selName")
+conName_RDR = varQual_RDR gHC_GENERICS (fsLit "conName")
+conFixity_RDR = varQual_RDR gHC_GENERICS (fsLit "conFixity")
+conIsRecord_RDR = varQual_RDR gHC_GENERICS (fsLit "conIsRecord")
+conIsTuple_RDR = varQual_RDR gHC_GENERICS (fsLit "conIsTuple")
+
+noArityDataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "NoArity")
+arityDataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "Arity")
+prefixDataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "Prefix")
+infixDataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "Infix")
+leftAssocDataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "LeftAssociative")
+rightAssocDataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "RightAssociative")
+notAssocDataCon_RDR = dataQual_RDR gHC_GENERICS (fsLit "NotAssociative")
+
+
fmap_RDR, pure_RDR, ap_RDR, foldable_foldr_RDR, traverse_RDR :: RdrName
fmap_RDR = varQual_RDR gHC_BASE (fsLit "fmap")
pure_RDR = varQual_RDR cONTROL_APPLICATIVE (fsLit "pure")
leftDataConName = conName dATA_EITHER (fsLit "Left") leftDataConKey
rightDataConName = conName dATA_EITHER (fsLit "Right") rightDataConKey
--- Generics
+-- Old Generics (types)
crossTyConName, plusTyConName, genUnitTyConName :: Name
crossTyConName = tcQual gHC_GENERICS (fsLit ":*:") crossTyConKey
plusTyConName = tcQual gHC_GENERICS (fsLit ":+:") plusTyConKey
genUnitTyConName = tcQual gHC_GENERICS (fsLit "Unit") genUnitTyConKey
+-- Generics (types)
+v1TyConName, u1TyConName, par1TyConName, rec1TyConName,
+ k1TyConName, m1TyConName, sumTyConName, prodTyConName,
+ compTyConName, rTyConName, pTyConName, dTyConName,
+ cTyConName, sTyConName, rec0TyConName, par0TyConName,
+ d1TyConName, c1TyConName, s1TyConName, noSelTyConName,
+ rep0TyConName, rep1TyConName :: Name
+
+v1TyConName = tcQual gHC_GENERICS (fsLit "V1") v1TyConKey
+u1TyConName = tcQual gHC_GENERICS (fsLit "U1") u1TyConKey
+par1TyConName = tcQual gHC_GENERICS (fsLit "Par1") par1TyConKey
+rec1TyConName = tcQual gHC_GENERICS (fsLit "Rec1") rec1TyConKey
+k1TyConName = tcQual gHC_GENERICS (fsLit "K1") k1TyConKey
+m1TyConName = tcQual gHC_GENERICS (fsLit "M1") m1TyConKey
+
+sumTyConName = tcQual gHC_GENERICS (fsLit ":+:") sumTyConKey
+prodTyConName = tcQual gHC_GENERICS (fsLit ":*:") prodTyConKey
+compTyConName = tcQual gHC_GENERICS (fsLit ":.:") compTyConKey
+
+rTyConName = tcQual gHC_GENERICS (fsLit "R") rTyConKey
+pTyConName = tcQual gHC_GENERICS (fsLit "P") pTyConKey
+dTyConName = tcQual gHC_GENERICS (fsLit "D") dTyConKey
+cTyConName = tcQual gHC_GENERICS (fsLit "C") cTyConKey
+sTyConName = tcQual gHC_GENERICS (fsLit "S") sTyConKey
+
+rec0TyConName = tcQual gHC_GENERICS (fsLit "Rec0") rec0TyConKey
+par0TyConName = tcQual gHC_GENERICS (fsLit "Par0") par0TyConKey
+d1TyConName = tcQual gHC_GENERICS (fsLit "D1") d1TyConKey
+c1TyConName = tcQual gHC_GENERICS (fsLit "C1") c1TyConKey
+s1TyConName = tcQual gHC_GENERICS (fsLit "S1") s1TyConKey
+noSelTyConName = tcQual gHC_GENERICS (fsLit "NoSelector") noSelTyConKey
+
+rep0TyConName = tcQual gHC_GENERICS (fsLit "Rep0") rep0TyConKey
+rep1TyConName = tcQual gHC_GENERICS (fsLit "Rep1") rep1TyConKey
+
-- Base strings Strings
unpackCStringName, unpackCStringAppendName, unpackCStringFoldrName,
unpackCStringUtf8Name, eqStringName, stringTyConName :: Name
readClassName :: Name
readClassName = clsQual gHC_READ (fsLit "Read") readClassKey
+-- Classes Representable0 and Representable1, Datatype, Constructor and Selector
+rep0ClassName, rep1ClassName, datatypeClassName, constructorClassName,
+ selectorClassName :: Name
+rep0ClassName = clsQual gHC_GENERICS (fsLit "Representable0") rep0ClassKey
+rep1ClassName = clsQual gHC_GENERICS (fsLit "Representable1") rep1ClassKey
+
+datatypeClassName = clsQual gHC_GENERICS (fsLit "Datatype") datatypeClassKey
+constructorClassName = clsQual gHC_GENERICS (fsLit "Constructor") constructorClassKey
+selectorClassName = clsQual gHC_GENERICS (fsLit "Selector") selectorClassKey
+
-- parallel array types and functions
enumFromToPName, enumFromThenToPName, nullPName, lengthPName,
singletonPName, replicatePName, mapPName, filterPName,
applicativeClassKey = mkPreludeClassUnique 34
foldableClassKey = mkPreludeClassUnique 35
traversableClassKey = mkPreludeClassUnique 36
+
+rep0ClassKey, rep1ClassKey, datatypeClassKey, constructorClassKey,
+ selectorClassKey :: Unique
+rep0ClassKey = mkPreludeClassUnique 37
+rep1ClassKey = mkPreludeClassUnique 38
+
+datatypeClassKey = mkPreludeClassUnique 39
+constructorClassKey = mkPreludeClassUnique 40
+selectorClassKey = mkPreludeClassUnique 41
\end{code}
%************************************************************************
funPtrTyConKey = mkPreludeTyConUnique 75
tVarPrimTyConKey = mkPreludeTyConUnique 76
--- Generic Type Constructors
+-- Old Generic Type Constructors
crossTyConKey, plusTyConKey, genUnitTyConKey :: Unique
crossTyConKey = mkPreludeTyConUnique 79
plusTyConKey = mkPreludeTyConUnique 80
stringTyConKey :: Unique
stringTyConKey = mkPreludeTyConUnique 134
+-- Generics (Unique keys)
+v1TyConKey, u1TyConKey, par1TyConKey, rec1TyConKey,
+ k1TyConKey, m1TyConKey, sumTyConKey, prodTyConKey,
+ compTyConKey, rTyConKey, pTyConKey, dTyConKey,
+ cTyConKey, sTyConKey, rec0TyConKey, par0TyConKey,
+ d1TyConKey, c1TyConKey, s1TyConKey, noSelTyConKey,
+ rep0TyConKey, rep1TyConKey :: Unique
+
+v1TyConKey = mkPreludeTyConUnique 135
+u1TyConKey = mkPreludeTyConUnique 136
+par1TyConKey = mkPreludeTyConUnique 137
+rec1TyConKey = mkPreludeTyConUnique 138
+k1TyConKey = mkPreludeTyConUnique 139
+m1TyConKey = mkPreludeTyConUnique 140
+
+sumTyConKey = mkPreludeTyConUnique 141
+prodTyConKey = mkPreludeTyConUnique 142
+compTyConKey = mkPreludeTyConUnique 143
+
+rTyConKey = mkPreludeTyConUnique 144
+pTyConKey = mkPreludeTyConUnique 145
+dTyConKey = mkPreludeTyConUnique 146
+cTyConKey = mkPreludeTyConUnique 147
+sTyConKey = mkPreludeTyConUnique 148
+
+rec0TyConKey = mkPreludeTyConUnique 149
+par0TyConKey = mkPreludeTyConUnique 150
+d1TyConKey = mkPreludeTyConUnique 151
+c1TyConKey = mkPreludeTyConUnique 152
+s1TyConKey = mkPreludeTyConUnique 153
+noSelTyConKey = mkPreludeTyConUnique 154
+
+rep0TyConKey = mkPreludeTyConUnique 155
+rep1TyConKey = mkPreludeTyConUnique 156
+
---------------- Template Haskell -------------------
-- USES TyConUniques 200-299
-----------------------------------------------------
-> RnM (LHsBinds Name, FreeVars)
rnMethodBinds cls sig_fn gen_tyvars binds
- = foldlM do_one (emptyBag,emptyFVs) (bagToList binds)
+ = do { checkDupRdrNames meth_names
+ -- Check that the same method is not given twice in the
+ -- same instance decl instance C T where
+ -- f x = ...
+ -- g y = ...
+ -- f x = ...
+ -- We must use checkDupRdrNames because the Name of the
+ -- method is the Name of the class selector, whose SrcSpan
+ -- points to the class declaration; and we use rnMethodBinds
+ -- for instance decls too
+
+ ; foldlM do_one (emptyBag, emptyFVs) (bagToList binds) }
where
+ meth_names = collectMethodBinders binds
do_one (binds,fvs) bind
= do { (bind', fvs_bind) <- rnMethodBind cls sig_fn gen_tyvars bind
; return (binds `unionBags` bind', fvs_bind `plusFV` fvs) }
-- Check for duplicates on RdrName version,
-- because renamed version has unboundName for
-- not-in-scope binders, which gives bogus dup-sig errors
-
+ -- NB: in a class decl, a 'generic' sig is not considered
+ -- equal to an ordinary sig, so we allow, say
+ -- class C a where
+ -- op :: a -> a
+ -- generic op :: Eq a => a -> a
+
; sigs' <- mapM (wrapLocM (renameSig mb_names)) sigs
; let (good_sigs, bad_sigs) = partition (ok_sig . unLoc) sigs'
; new_ty <- rnHsSigType (quotes (ppr v)) ty
; return (TypeSig new_v new_ty) }
+renameSig mb_names sig@(GenericSig v ty)
+ = do { new_v <- lookupSigOccRn mb_names sig v
+ ; new_ty <- rnHsSigType (quotes (ppr v)) ty
+ ; return (GenericSig new_v new_ty) } -- JPM: ?
+
renameSig _ (SpecInstSig ty)
= do { new_ty <- rnLHsType (text "A SPECIALISE instance pragma") ty
; return (SpecInstSig new_ty) }
hsSigsFVs sigs = plusFVs (map (hsSigFVs.unLoc) sigs)
hsSigFVs :: Sig Name -> FreeVars
-hsSigFVs (TypeSig _ ty) = extractHsTyNames ty
-hsSigFVs (SpecInstSig ty) = extractHsTyNames ty
-hsSigFVs (SpecSig _ ty _) = extractHsTyNames ty
-hsSigFVs _ = emptyFVs
+hsSigFVs (TypeSig _ ty) = extractHsTyNames ty
+hsSigFVs (GenericSig _ ty) = extractHsTyNames ty
+hsSigFVs (SpecInstSig ty) = extractHsTyNames ty
+hsSigFVs (SpecSig _ ty _) = extractHsTyNames ty
+hsSigFVs _ = emptyFVs
----------------
conDeclFVs :: LConDecl Name -> FreeVars
-- The typechecker (not the renamer) checks that all
-- the bindings are for the right class
let
- meth_names = collectMethodBinders mbinds
(inst_tyvars, _, cls,_) = splitHsInstDeclTy (unLoc inst_ty')
in
- checkDupRdrNames meth_names `thenM_`
- -- Check that the same method is not given twice in the
- -- same instance decl instance C T where
- -- f x = ...
- -- g y = ...
- -- f x = ...
- -- We must use checkDupRdrNames because the Name of the
- -- method is the Name of the class selector, whose SrcSpan
- -- points to the class declaration
-
extendTyVarEnvForMethodBinds inst_tyvars (
-- (Slightly strangely) the forall-d tyvars scope over
-- the method bindings too
tcClassSigs :: Name -- Name of the class
-> [LSig Name]
-> LHsBinds Name
- -> TcM [TcMethInfo]
+ -> TcM [TcMethInfo] -- One for each method
tcClassSigs clas sigs def_methods
- = do { dm_env <- mapM (addLocM (checkDefaultBind clas op_names))
- (bagToList def_methods)
- ; mapM (tcClassSig (mkNameEnv dm_env)) op_sigs }
- where
- op_sigs = [sig | sig@(L _ (TypeSig _ _)) <- sigs]
- op_names = [n | (L _ (TypeSig (L _ n) _)) <- op_sigs]
-
-checkDefaultBind :: Name -> [Name] -> HsBindLR Name Name -> TcM (Name, DefMethSpec)
- -- Check default bindings
- -- a) must be for a class op for this class
- -- b) must be all generic or all non-generic
-checkDefaultBind clas ops (FunBind {fun_id = L _ op, fun_matches = MatchGroup matches _ })
- = do { -- Check that the op is from this class
- checkTc (op `elem` ops) (badMethodErr clas op)
-
- -- Check that all the defns ar generic, or none are
- ; case (none_generic, all_generic) of
- (True, _) -> return (op, VanillaDM)
- (_, True) -> return (op, GenericDM)
- _ -> failWith (mixedGenericErr op)
- }
- where
- n_generic = count (isJust . maybeGenericMatch) matches
- none_generic = n_generic == 0
- all_generic = matches `lengthIs` n_generic
+ = do { -- Check that all def_methods are in the class
+ ; op_info <- mapM (addLocM tc_sig) [sig | sig@(L _ (TypeSig _ _)) <- sigs]
+ ; let op_names = [ n | (n,_,_) <- op_info ]
-checkDefaultBind _ _ b = pprPanic "checkDefaultBind" (ppr b)
+ ; sequence [ failWithTc (badMethodErr clas n)
+ | n <- dm_bind_names, not (n `elem` op_names) ]
+ -- Value binding for non class-method (ie no TypeSig)
+ ; sequence [ failWithTc (badGenericMethod clas n)
+ | n <- genop_names, not (n `elem` dm_bind_names) ]
+ -- Generic signature without value binding
-tcClassSig :: NameEnv DefMethSpec -- Info about default methods;
- -> LSig Name
- -> TcM TcMethInfo
-
-tcClassSig dm_env (L loc (TypeSig (L _ op_name) op_hs_ty))
- = setSrcSpan loc $ do
- { op_ty <- tcHsKindedType op_hs_ty -- Class tyvars already in scope
- ; let dm = lookupNameEnv dm_env op_name `orElse` NoDM
- ; return (op_name, dm, op_ty) }
-tcClassSig _ s = pprPanic "tcClassSig" (ppr s)
+ ; return op_info }
+ where
+ dm_bind_names :: [Name] -- These ones have a value binding in the class decl
+ dm_bind_names = [op | L _ (FunBind {fun_id = L _ op}) <- bagToList def_methods]
+
+ genop_names :: [Name] -- These ones have a generic signature
+ genop_names = [n | L _ (GenericSig (L _ n) _) <- sigs]
+
+ tc_sig (TypeSig (L _ op_name) op_hs_ty)
+ = do { op_ty <- tcHsKindedType op_hs_ty -- Class tyvars already in scope
+ ; let dm | op_name `elem` genop_names = GenericDM
+ | op_name `elem` dm_bind_names = VanillaDM
+ | otherwise = NoDM
+ ; return (op_name, dm, op_ty) }
+ tc_sig sig = pprPanic "tc_cls_sig" (ppr sig)
\end{code}
pred = mkClassPred clas (mkTyVarTys clas_tyvars)
; this_dict <- newEvVar pred
+ ; traceTc "TIM2" (ppr sigs)
; let tc_dm = tcDefMeth clas clas_tyvars
- this_dict default_binds
+ this_dict default_binds sigs
sig_fn prag_fn
; dm_binds <- tcExtendTyVarEnv clas_tyvars $
mapM tc_dm op_items
- ; return (listToBag (catMaybes dm_binds)) }
+ ; return (unionManyBags dm_binds) }
tcClassDecl2 d = pprPanic "tcClassDecl2" (ppr d)
-tcDefMeth :: Class -> [TyVar] -> EvVar -> LHsBinds Name
+tcDefMeth :: Class -> [TyVar] -> EvVar -> LHsBinds Name -> [LSig Name]
-> SigFun -> PragFun -> ClassOpItem
- -> TcM (Maybe (LHsBind Id))
+ -> TcM (LHsBinds TcId)
-- Generate code for polymorphic default methods only (hence DefMeth)
-- (Generic default methods have turned into instance decls by now.)
-- This is incompatible with Hugs, which expects a polymorphic
-- default method for every class op, regardless of whether or not
-- the programmer supplied an explicit default decl for the class.
-- (If necessary we can fix that, but we don't have a convenient Id to hand.)
-tcDefMeth clas tyvars this_dict binds_in sig_fn prag_fn (sel_id, dm_info)
- = case dm_info of
- NoDefMeth -> return Nothing
- GenDefMeth -> return Nothing
- DefMeth dm_name -> do
- { let sel_name = idName sel_id
- ; local_dm_name <- newLocalName sel_name
- -- Base the local_dm_name on the selector name, because
- -- type errors from tcInstanceMethodBody come from here
-
- -- See Note [Silly default-method bind]
- -- (possibly out of date)
-
- ; let meth_bind = findMethodBind sel_name binds_in
- `orElse` pprPanic "tcDefMeth" (ppr sel_id)
- -- dm_info = DefMeth dm_name only if there is a binding in binds_in
-
- dm_sig_fn _ = sig_fn sel_name
- dm_id = mkDefaultMethodId sel_id dm_name
- local_dm_type = instantiateMethod clas sel_id (mkTyVarTys tyvars)
- local_dm_id = mkLocalId local_dm_name local_dm_type
- prags = prag_fn sel_name
-
- ; dm_id_w_inline <- addInlinePrags dm_id prags
- ; spec_prags <- tcSpecPrags dm_id prags
-
- ; warnTc (not (null spec_prags))
- (ptext (sLit "Ignoring SPECIALISE pragmas on default method")
- <+> quotes (ppr sel_name))
-
- ; liftM Just $
- tcInstanceMethodBody (ClsSkol clas)
- tyvars
- [this_dict]
- dm_id_w_inline local_dm_id
- dm_sig_fn IsDefaultMethod meth_bind }
+tcDefMeth clas tyvars this_dict binds_in sigs sig_fn prag_fn (sel_id, dm_info)
+ | NoDefMeth <- dm_info = return emptyBag
+ | otherwise
+ = do { (dm_id, tvs, sig_loc) <- tc_dm_id dm_info
+ ; let L loc meth_bind = findMethodBind sel_name binds_in
+ `orElse` pprPanic "tcDefMeth" (ppr sel_id)
+ dm_bind = L loc (meth_bind { fun_id = L loc (idName dm_id) })
+ -- Substitute the meth_name for the binder
+ -- NB: the binding is always a FunBind
+
+ dm_sig_fn _ = Just (clas_tv_names ++ tvs, sig_loc)
+ dm_prag_fn _ = prag_fn sel_name
+
+ ; (binds,_) <- tcExtendIdEnv [dm_id] $
+ tcPolyBinds TopLevel dm_sig_fn dm_prag_fn
+ NonRecursive NonRecursive
+ [dm_bind]
+ ; return binds }
+ where
+ sel_name = idName sel_id
+ clas_tv_names = map getName tyvars
+
+ -- Find the 'generic op :: ty' signature among the sigs
+ -- If dm_info is GenDefMeth, the corresponding signature
+ -- should jolly well exist! Hence the panic
+ genop_lhs_ty = case [lty | L _ (GenericSig (L _ n) lty) <- sigs
+ , n == sel_name ] of
+ [lty] -> lty
+ _ -> pprPanic "tcDefMeth" (ppr sel_name $$ ppr sigs)
+
+ tc_dm_id :: DefMeth -> TcM (Id, [Name], SrcSpan)
+ -- Make a default-method Id of the appropriate type
+ -- That may entail getting the generic-default signature
+ -- from the type signatures.
+ -- Also return the in-scope tyvars for the default method, and their binding site
+ tc_dm_id NoDefMeth = panic "tc_dm_id"
+ tc_dm_id (DefMeth dm_name)
+ | Just (tvs, loc) <- sig_fn sel_name
+ = return (mkDefaultMethodId sel_id dm_name, tvs, loc)
+ | otherwise
+ = pprPanic "No sig for" (ppr sel_name)
+ tc_dm_id (GenDefMeth dm_name)
+ = setSrcSpan loc $
+ do { tau <- tcHsKindedType genop_lhs_ty
+ ; checkValidType (FunSigCtxt sel_name) tau
+ ; return ( mkExportedLocalId dm_name (mkForAllTys tyvars tau)
+ , hsExplicitTvs genop_lhs_ty, loc ) }
+ where
+ loc = getLoc genop_lhs_ty
---------------
tcInstanceMethodBody :: SkolemInfo -> [TcTyVar] -> [EvVar]
let lm_bind = L loc (bind { fun_id = L loc (idName local_meth_id) })
-- Substitute the local_meth_name for the binder
-- NB: the binding is always a FunBind
-
+ ; traceTc "TIM" (ppr local_meth_id $$ ppr (meth_sig_fn (idName local_meth_id)))
; (ev_binds, (tc_bind, _))
<- checkConstraints skol_info tyvars dfun_ev_vars $
tcExtendIdEnv [local_meth_id] $
op Unit = ...
\begin{code}
-mkGenericDefMethBind :: Class -> [Type] -> Id -> TcM (LHsBind Name)
-mkGenericDefMethBind clas inst_tys sel_id
+mkGenericDefMethBind :: Class -> [Type] -> Id -> Name -> TcM (LHsBind Name)
+mkGenericDefMethBind clas inst_tys sel_id dm_name
= -- A generic default method
- -- If the method is defined generically, we can only do the job if the
- -- instance declaration is for a single-parameter type class with
- -- a type constructor applied to type arguments in the instance decl
- -- (checkTc, so False provokes the error)
- do { checkTc (isJust maybe_tycon)
- (badGenericInstance sel_id (notSimple inst_tys))
- ; checkTc (tyConHasGenerics tycon)
- (badGenericInstance sel_id (notGeneric tycon))
-
- ; dflags <- getDOpts
+ -- If the method is defined generically, we only have to call the
+ -- dm_name.
+ do { dflags <- getDOpts
; liftIO (dumpIfSet_dyn dflags Opt_D_dump_deriv "Filling in method body"
(vcat [ppr clas <+> ppr inst_tys,
nest 2 (ppr sel_id <+> equals <+> ppr rhs)]))
- -- Rename it before returning it
- ; (rn_rhs, _) <- rnLExpr rhs
; return (noLoc $ mkFunBind (noLoc (idName sel_id))
- [mkSimpleMatch [] rn_rhs]) }
+ [mkSimpleMatch [] rhs]) }
where
- rhs = mkGenericRhs sel_id clas_tyvar tycon
-
- -- The tycon is only used in the generic case, and in that
- -- case we require that the instance decl is for a single-parameter
- -- type class with type variable arguments:
- -- instance (...) => C (T a b)
- clas_tyvar = ASSERT (not (null (classTyVars clas))) head (classTyVars clas)
- Just tycon = maybe_tycon
- maybe_tycon = case inst_tys of
- [ty] -> case tcSplitTyConApp_maybe ty of
- Just (tycon, arg_tys) | all tcIsTyVarTy arg_tys -> Just tycon
- _ -> Nothing
- _ -> Nothing
-
+ rhs = nlHsVar dm_name
---------------------------
getGenericInstances :: [LTyClDecl Name] -> TcM [InstInfo Name]
= hsep [ptext (sLit "Class"), quotes (ppr clas),
ptext (sLit "does not have a method"), quotes (ppr op)]
+badGenericMethod :: Outputable a => a -> Name -> SDoc
+badGenericMethod clas op
+ = hsep [ptext (sLit "Class"), quotes (ppr clas),
+ ptext (sLit "has a generic-default signature without a binding"), quotes (ppr op)]
+
badATErr :: Class -> Name -> SDoc
badATErr clas at
= hsep [ptext (sLit "Class"), quotes (ppr clas),
import NameSet
import TyCon
import TcType
+import BuildTyCl
+import BasicTypes
import Var
import VarSet
import PrelNames
import SrcLoc
+import Unique
+import UniqSupply
import Util
import ListSetOps
import Outputable
tcDeriving :: [LTyClDecl Name] -- All type constructors
-> [LInstDecl Name] -- All instance declarations
-> [LDerivDecl Name] -- All stand-alone deriving declarations
- -> TcM ([InstInfo Name], -- The generated "instance decls"
- HsValBinds Name, -- Extra generated top-level bindings
- DefUses)
+ -> TcM ([InstInfo Name] -- The generated "instance decls"
+ ,HsValBinds Name -- Extra generated top-level bindings
+ ,DefUses
+ ,[TyCon] -- Extra generated top-level types
+ ,[TyCon]) -- Extra generated type family instances
tcDeriving tycl_decls inst_decls deriv_decls
- = recoverM (return ([], emptyValBindsOut, emptyDUs)) $
+ = recoverM (return ([], emptyValBindsOut, emptyDUs, [], [])) $
do { -- Fish the "deriving"-related information out of the TcEnv
-- And make the necessary "equations".
is_boot <- tcIsHsBoot
; insts2 <- mapM (genInst False overlap_flag) final_specs
- -- Generate the generic to/from functions from each type declaration
- ; gen_binds <- mkGenericBinds is_boot tycl_decls
- ; (inst_info, rn_binds, rn_dus) <- renameDeriv is_boot gen_binds (insts1 ++ insts2)
+ -- Generate the (old) generic to/from functions from each type declaration
+ ; gen_binds <- return emptyBag -- mkGenericBinds is_boot tycl_decls
+
+ -- Generate the generic Representable0/1 instances from each type declaration
+ ; repInstsMeta <- genGenericRepBinds is_boot tycl_decls
+
+ ; let repInsts = concat (map (\(a,b,c) -> a) repInstsMeta)
+ repMetaTys = map (\(a,b,c) -> b) repInstsMeta
+ repTyCons = map (\(a,b,c) -> c) repInstsMeta
+ -- Should we extendLocalInstEnv with repInsts?
+
+ ; (inst_info, rn_binds, rn_dus) <- renameDeriv is_boot gen_binds (insts1 ++ insts2 ++ repInsts)
+
+ ; dflags <- getDOpts
+ ; liftIO (dumpIfSet_dyn dflags Opt_D_dump_deriv "Derived instances"
+ (ddump_deriving inst_info rn_binds))
; when (not (null inst_info)) $
dumpDerivingInfo (ddump_deriving inst_info rn_binds)
-
- ; return (inst_info, rn_binds, rn_dus) }
+ ; return ( inst_info, rn_binds, rn_dus
+ , concat (map metaTyCons2TyCons repMetaTys), repTyCons) }
where
ddump_deriving :: [InstInfo Name] -> HsValBinds Name -> SDoc
ddump_deriving inst_infos extra_binds
,(foldableClassKey, gen_Foldable_binds)
,(traversableClassKey, gen_Traversable_binds)
]
+
+-- Generate the binds for the generic representation
+genGenericRepBinds :: Bool -> [LTyClDecl Name]
+ -> TcM [([(InstInfo RdrName, DerivAuxBinds)]
+ , MetaTyCons, TyCon)]
+genGenericRepBinds isBoot tyclDecls
+ | isBoot = return []
+ | otherwise = do
+ allTyDecls <- mapM tcLookupTyCon [ tcdName d | L _ d <- tyclDecls
+ , isDataDecl d ]
+ let tyDecls = filter tyConHasGenerics allTyDecls
+ inst1 <- mapM genGenericRepBind tyDecls
+ let (repInsts, metaTyCons, repTys) = unzip3 inst1
+ metaInsts <- ASSERT (length tyDecls == length metaTyCons)
+ mapM genDtMeta (zip tyDecls metaTyCons)
+ return (ASSERT (length inst1 == length metaInsts)
+ [ (ri : mi, ms, rt)
+ | ((ri, ms, rt), mi) <- zip inst1 metaInsts ])
+
+genGenericRepBind :: TyCon -> TcM ((InstInfo RdrName, DerivAuxBinds)
+ , MetaTyCons, TyCon)
+genGenericRepBind tc =
+ do clas <- tcLookupClass rep0ClassName
+ uniqS <- newUniqueSupply
+ dfun_name <- new_dfun_name clas tc
+ let
+ -- Uniques for everyone
+ (uniqD:uniqs) = uniqsFromSupply uniqS
+ (uniqsC,us) = splitAt (length tc_cons) uniqs
+ uniqsS :: [[Unique]] -- Unique supply for the S datatypes
+ uniqsS = mkUniqsS tc_arits us
+ mkUniqsS [] _ = []
+ mkUniqsS (n:t) us = case splitAt n us of
+ (us1,us2) -> us1 : mkUniqsS t us2
+
+ tc_name = tyConName tc
+ tc_cons = tyConDataCons tc
+ tc_arits = map dataConSourceArity tc_cons
+
+ tc_occ = nameOccName tc_name
+ d_occ = mkGenD tc_occ
+ c_occ m = mkGenC tc_occ m
+ s_occ m n = mkGenS tc_occ m n
+ mod_name = nameModule (tyConName tc)
+ d_name = mkExternalName uniqD mod_name d_occ wiredInSrcSpan
+ c_names = [ mkExternalName u mod_name (c_occ m) wiredInSrcSpan
+ | (u,m) <- zip uniqsC [0..] ]
+ s_names = [ [ mkExternalName u mod_name (s_occ m n) wiredInSrcSpan
+ | (u,n) <- zip us [0..] ] | (us,m) <- zip uniqsS [0..] ]
+ tvs = tyConTyVars tc
+ tc_ty = mkTyConApp tc (mkTyVarTys tvs)
+
+ mkTyCon name = ASSERT( isExternalName name )
+ buildAlgTyCon name [] [] mkAbstractTyConRhs
+ NonRecursive False False NoParentTyCon Nothing
+
+ metaDTyCon <- mkTyCon d_name
+ metaCTyCons <- sequence [ mkTyCon c_name | c_name <- c_names ]
+ metaSTyCons <- mapM sequence
+ [ [ mkTyCon s_name
+ | s_name <- s_namesC ] | s_namesC <- s_names ]
+
+ let metaDts = MetaTyCons metaDTyCon metaCTyCons metaSTyCons
+
+ rep0_tycon <- tc_mkRep0TyCon tc metaDts
+
+ let
+ mkInstRep0 = (InstInfo { iSpec = inst, iBinds = binds }
+ , [ {- No DerivAuxBinds -} ])
+ inst = mkLocalInstance dfun NoOverlap
+ binds = VanillaInst (mkBindsRep0 tc) [] False
+
+ dfun = mkDictFunId dfun_name (tyConTyVars tc) [] clas [tc_ty]
+ return (mkInstRep0, metaDts, rep0_tycon)
+
+genDtMeta :: (TyCon, MetaTyCons) -> TcM [(InstInfo RdrName, DerivAuxBinds)]
+genDtMeta (tc,metaDts) =
+ do dClas <- tcLookupClass datatypeClassName
+ d_dfun_name <- new_dfun_name dClas tc
+ cClas <- tcLookupClass constructorClassName
+ c_dfun_names <- sequence [ new_dfun_name cClas tc | _ <- metaC metaDts ]
+ sClas <- tcLookupClass selectorClassName
+ s_dfun_names <- sequence (map sequence [ [ new_dfun_name sClas tc
+ | _ <- x ]
+ | x <- metaS metaDts ])
+ fix_env <- getFixityEnv
+
+ let
+ (dBinds,cBinds,sBinds) = mkBindsMetaD fix_env tc
+
+ -- Datatype
+ d_metaTycon = metaD metaDts
+ d_inst = mkLocalInstance d_dfun NoOverlap
+ d_binds = VanillaInst dBinds [] False
+ d_dfun = mkDictFunId d_dfun_name (tyConTyVars tc) [] dClas
+ [ mkTyConTy d_metaTycon ]
+ d_mkInst = (InstInfo { iSpec = d_inst, iBinds = d_binds }, [])
+
+ -- Constructor
+ c_metaTycons = metaC metaDts
+ c_insts = [ mkLocalInstance (c_dfun c ds) NoOverlap
+ | (c, ds) <- myZip1 c_metaTycons c_dfun_names ]
+ c_binds = [ VanillaInst c [] False | c <- cBinds ]
+ c_dfun c dfun_name = mkDictFunId dfun_name (tyConTyVars tc) [] cClas
+ [ mkTyConTy c ]
+ c_mkInst = [ (InstInfo { iSpec = is, iBinds = bs }, [])
+ | (is,bs) <- myZip1 c_insts c_binds ]
+
+ -- Selector
+ s_metaTycons = metaS metaDts
+ s_insts = map (map (\(s,ds) -> mkLocalInstance (s_dfun s ds) NoOverlap))
+ (myZip2 s_metaTycons s_dfun_names)
+ s_binds = [ [ VanillaInst s [] False | s <- ss ] | ss <- sBinds ]
+ s_dfun s dfun_name = mkDictFunId dfun_name (tyConTyVars tc) [] sClas
+ [ mkTyConTy s ]
+ s_mkInst = map (map (\(is,bs) -> (InstInfo {iSpec=is, iBinds=bs}, [])))
+ (myZip2 s_insts s_binds)
+
+ myZip1 :: [a] -> [b] -> [(a,b)]
+ myZip1 l1 l2 = ASSERT (length l1 == length l2) zip l1 l2
+
+ myZip2 :: [[a]] -> [[b]] -> [[(a,b)]]
+ myZip2 l1 l2 =
+ ASSERT (and (zipWith (>=) (map length l1) (map length l2)))
+ [ zip x1 x2 | (x1,x2) <- zip l1 l2 ]
+
+ return (d_mkInst : c_mkInst ++ concat s_mkInst)
\end{code}
}
tcLookupDataFamInst :: TyCon -> [Type] -> TcM (TyCon, [Type])
--- Find the instance of a data famliy
+-- Find the instance of a data family
-- Note [Looking up family instances for deriving]
tcLookupDataFamInst tycon tys
| not (isFamilyTyCon tycon)
\begin{code}
tcExtendRules :: [LRuleDecl Id] -> TcM a -> TcM a
-- Just pop the new rules into the EPS and envt resp
- -- All the rules come from an interface file, not soruce
+ -- All the rules come from an interface file, not source
-- Nevertheless, some may be for this module, if we read
-- its interface instead of its source code
tcExtendRules lcl_rules thing_inside
\end{code}
Make a name for the representation tycon of a family instance. It's an
-*external* name, like otber top-level names, and hence must be made with
+*external* name, like other top-level names, and hence must be made with
newGlobalBinder.
\begin{code}
import HscTypes
import PrelInfo
import MkCore ( eRROR_ID )
-import PrelNames
+import PrelNames hiding (error_RDR)
import PrimOp
import SrcLoc
import TyCon
-- NB: class instance declarations can contain derivings as
-- part of associated data type declarations
failIfErrsM -- If the addInsts stuff gave any errors, don't
- -- try the deriving stuff, becuase that may give
+ -- try the deriving stuff, because that may give
-- more errors still
- ; (deriv_inst_info, deriv_binds, deriv_dus)
+ ; (deriv_inst_info, deriv_binds, deriv_dus, deriv_tys, deriv_ty_insts)
<- tcDeriving tycl_decls inst_decls deriv_decls
- ; gbl_env <- addInsts deriv_inst_info getGblEnv
- ; return ( addTcgDUs gbl_env deriv_dus,
+
+ -- Extend the global environment also with the generated datatypes for
+ -- the generic representation
+ ; gbl_env <- addFamInsts (map ATyCon deriv_ty_insts) $
+ tcExtendGlobalEnv (map ATyCon (deriv_tys ++ deriv_ty_insts)) $
+ addInsts deriv_inst_info getGblEnv
+-- ; traceTc "Generic deriving" (vcat (map pprInstInfo deriv_inst_info))
+ ; return ( addTcgDUs gbl_env deriv_dus,
generic_inst_info ++ deriv_inst_info ++ local_info,
aux_binds `plusHsValBinds` deriv_binds)
}}}
----------------------
tc_default :: Id -> DefMeth -> TcM (TcId, LHsBind Id)
+
+ tc_default sel_id (GenDefMeth dm_name)
+ = do { meth_bind <- mkGenericDefMethBind clas inst_tys sel_id dm_name
+ ; tc_body sel_id False {- Not generated code? -} meth_bind }
+{-
tc_default sel_id GenDefMeth -- Derivable type classes stuff
= do { meth_bind <- mkGenericDefMethBind clas inst_tys sel_id
; tc_body sel_id False {- Not generated code? -} meth_bind }
-
+-}
tc_default sel_id NoDefMeth -- No default method at all
= do { warnMissingMethod sel_id
; (meth_id, _) <- mkMethIds clas tyvars dfun_ev_vars
-- any mutually recursive types are done right
-- Just discard the auxiliary bindings; they are generated
-- only for Haskell source code, and should already be in Core
- (tcg_env, _aux_binds, _dm_ids) <- tcTyAndClassDecls emptyModDetails rn_decls ;
+ (tcg_env, _aux_binds, _dm_ids, _) <- tcTyAndClassDecls emptyModDetails rn_decls ;
setGblEnv tcg_env $ do {
-- Make the new type env available to stuff slurped from interface files
-- Typecheck type/class decls
; traceTc "Tc2" empty
- ; (tcg_env, aux_binds, dm_ids)
+ ; (tcg_env, aux_binds, dm_ids, _)
<- tcTyAndClassDecls emptyModDetails tycl_decls
; setGblEnv tcg_env $
tcExtendIdEnv dm_ids $ do {
-- The latter come in via tycl_decls
traceTc "Tc2" empty ;
- (tcg_env, aux_binds, dm_ids) <- tcTyAndClassDecls boot_details tycl_decls ;
+ (tcg_env, aux_binds, dm_ids, kc_decls) <- tcTyAndClassDecls boot_details tycl_decls ;
-- If there are any errors, tcTyAndClassDecls fails here
setGblEnv tcg_env $
setLclTypeEnv tcl_env $ do { -- Environment doesn't change now
-- Second pass over class and instance declarations,
+ -- now using the kind-checked decls
traceTc "Tc6" empty ;
- inst_binds <- tcInstDecls2 (concat tycl_decls) inst_infos ;
+ inst_binds <- tcInstDecls2 kc_decls inst_infos ;
-- Foreign exports
traceTc "Tc7" empty ;
%************************************************************************
\begin{code}
+
tcTyAndClassDecls :: ModDetails
-> [[LTyClDecl Name]] -- Mutually-recursive groups in dependency order
-> TcM (TcGblEnv, -- Input env extended by types and classes
-- and their implicit Ids,DataCons
HsValBinds Name, -- Renamed bindings for record selectors
- [Id]) -- Default method ids
+ [Id], -- Default method ids
+ [LTyClDecl Name]) -- Kind-checked declarations
-- Fails if there are any errors
tcTyAndClassDecls boot_details decls_s
-- And now build the TyCons/Classes
; let rec_flags = calcRecFlags boot_details rec_tyclss
- ; concatMapM (tcTyClDecl rec_flags) kc_decls }
+ ; concatMapM (tcTyClDecl rec_flags) kc_decls }
; tcExtendGlobalEnv tyclss $ do
{ -- Perform the validity check
; dm_ids = mkDefaultMethodIds tyclss }
; env <- tcExtendGlobalEnv implicit_things getGblEnv
- ; return (env, rec_sel_binds, dm_ids) } }
+ -- We need the kind-checked declarations later, so we return them
+ -- from here
+ ; kc_decls <- kcTyClDecls tyclds_s
+ ; return (env, rec_sel_binds, dm_ids, kc_decls) } }
zipRecTyClss :: [[LTyClDecl Name]]
-> [TyThing] -- Knot-tied
where
kc_sig (TypeSig nm op_ty) = do { op_ty' <- kcHsLiftedSigType op_ty
; return (TypeSig nm op_ty') }
+ kc_sig (GenericSig nm op_ty) = do { op_ty' <- kcHsLiftedSigType op_ty
+ ; return (GenericSig nm op_ty') }
kc_sig other_sig = return other_sig
kcTyClDecl decl@(ForeignType {})
NewType -> ASSERT( not (null data_cons) )
mkNewTyConRhs tc_name tycon (head data_cons)
; buildAlgTyCon tc_name final_tvs stupid_theta tc_rhs is_rec
- (want_generic && canDoGenerics data_cons) (not h98_syntax)
+ (want_generic && canDoGenerics stupid_theta data_cons) (not h98_syntax)
NoParentTyCon Nothing
})
; return [ATyCon tycon]
where
(tyvars, fundeps, theta, _, _, op_stuff) = classExtraBigSig cls
unary = isSingleton tyvars
- no_generics = null [() | (_, GenDefMeth) <- op_stuff]
+ no_generics = null [() | (_, (GenDefMeth _)) <- op_stuff]
check_op constrained_class_methods (sel_id, dm)
= addErrCtxt (classOpCtxt sel_id tau) $ do
-- Check that for a generic method, the type of
-- the method is sufficiently simple
+{- -- JPM TODO
; checkTc (dm /= GenDefMeth || validGenericMethodType tau)
(badGenericMethodType op_name op_ty)
+-}
}
where
op_name = idName sel_id
data DefMeth = NoDefMeth -- No default method
| DefMeth Name -- A polymorphic default method
- | GenDefMeth -- A generic default method
+ | GenDefMeth Name -- A generic default method
deriving Eq
-- | Convert a `DefMethSpec` to a `DefMeth`, which discards the name field in
= case meth of
NoDefMeth -> NoDM
DefMeth _ -> VanillaDM
- GenDefMeth -> GenericDM
+ GenDefMeth _ -> GenericDM
\end{code}
showsPrec p c = showsPrecSDoc p (ppr c)
instance Outputable DefMeth where
- ppr (DefMeth n) = ptext (sLit "Default method") <+> ppr n
- ppr GenDefMeth = ptext (sLit "Generic default method")
- ppr NoDefMeth = empty -- No default method
+ ppr (DefMeth n) = ptext (sLit "Default method") <+> ppr n
+ ppr (GenDefMeth n) = ptext (sLit "Generic default method") <+> ppr n
+ ppr NoDefMeth = empty -- No default method
pprFundeps :: Outputable a => [FunDep a] -> SDoc
pprFundeps [] = empty
-- for details
module Generics ( canDoGenerics, mkTyConGenericBinds,
- mkGenericRhs,
- validGenericInstanceType, validGenericMethodType
+ mkGenericRhs,
+ validGenericInstanceType, validGenericMethodType,
+ mkBindsRep0, tc_mkRep0TyCon, mkBindsMetaD,
+ MetaTyCons(..), metaTyCons2TyCons
) where
import DataCon
import TyCon
-import Name
+import Name hiding (varName)
+import OccName (varName)
+import Module (moduleName, moduleNameString)
import RdrName
import BasicTypes
-import Var
+import Var hiding (varName)
import VarSet
import Id
import TysWiredIn
import PrelNames
+-- For generation of representation types
+import TcEnv (tcLookupTyCon)
+import TcRnMonad (TcM, newUnique)
+import TcMType (newMetaTyVar)
+import HscTypes
import SrcLoc
import Util
import Outputable
import FastString
+import Data.List (splitAt)
+import Debug.Trace (trace)
+
#include "HsVersions.h"
\end{code}
%************************************************************************
\begin{code}
-canDoGenerics :: [DataCon] -> Bool
+canDoGenerics :: ThetaType -> [DataCon] -> Bool
-- Called on source-code data types, to see if we should generate
-- generic functions for them. (This info is recorded in the interface file for
-- imported data types.)
-canDoGenerics data_cons
+canDoGenerics stupid_theta data_cons
= not (any bad_con data_cons) -- See comment below
- && not (null data_cons) -- No values of the type
+
+ -- && not (null data_cons) -- No values of the type
+ -- JPM: we now support empty datatypes
+
+ && null stupid_theta -- We do not support datatypes with context (for now)
where
bad_con dc = any bad_arg_type (dataConOrigArgTys dc) || not (isVanillaDataCon dc)
-- If any of the constructor has an unboxed type as argument,
-- Nor if the args are polymorphic types (I don't think)
bad_arg_type ty = isUnLiftedType ty || not (isTauTy ty)
+ -- JPM: TODO: I'm not sure I know what isTauTy checks for, so I'm leaving it
+ -- like this for now...
\end{code}
%************************************************************************
\begin{code}
type US = Int -- Local unique supply, just a plain Int
-type FromAlt = (LPat RdrName, LHsExpr RdrName)
-
+type Alt = (LPat RdrName, LHsExpr RdrName)
+{-
+data GenRep = GenRep {
+ genBindsFrom0 :: TyCon -> LHsBinds RdrName
+ , genBindsTo0 :: TyCon -> LHsBinds RdrName
+ , genBindsFrom1 :: TyCon -> LHsBinds RdrName
+ , genBindsTo1 :: TyCon -> LHsBinds RdrName
+ , genBindsModuleName :: TyCon -> LHsBinds RdrName
+ , genBindsConName :: DataCon -> LHsBinds RdrName
+ , genBindsConFixity :: DataCon -> LHsBinds RdrName
+ , genBindsConIsRecord :: DataCon -> LHsBinds RdrName
+ , genBindsSelName :: DataCon -> Int -> LHsBinds RdrName
+ }
+-}
+-- Bindings for the Representable0 instance
+mkBindsRep0 :: TyCon -> LHsBinds RdrName
+mkBindsRep0 tycon =
+ unitBag (L loc (mkFunBind (L loc from0_RDR) from0_matches))
+ `unionBags`
+ unitBag (L loc (mkFunBind (L loc to0_RDR) to0_matches))
+ where
+ from0_matches = [mkSimpleHsAlt pat rhs | (pat,rhs) <- from0_alts]
+ to0_matches = [mkSimpleHsAlt pat rhs | (pat,rhs) <- to0_alts ]
+ loc = srcLocSpan (getSrcLoc tycon)
+ datacons = tyConDataCons tycon
+
+ -- Recurse over the sum first
+ from0_alts, to0_alts :: [Alt]
+ (from0_alts, to0_alts) = mkSum (1 :: US) tycon datacons
+
+-- Disabled
mkTyConGenericBinds :: TyCon -> LHsBinds RdrName
-mkTyConGenericBinds tycon
- = unitBag (L loc (mkFunBind (L loc from_RDR) from_matches))
- `unionBags`
- unitBag (L loc (mkFunBind (L loc to_RDR) to_matches))
+mkTyConGenericBinds tycon =
+ {-
+ unitBag (L loc (mkFunBind (L loc from0_RDR) from0_matches))
+ `unionBags`
+ unitBag (L loc (mkFunBind (L loc to0_RDR) to0_matches))
+ `unionBags`
+ mkMeta loc tycon
+ -}
+ emptyBag
+{-
where
- from_matches = [mkSimpleHsAlt pat rhs | (pat,rhs) <- from_alts]
- to_matches = [mkSimpleHsAlt to_pat to_body]
- loc = srcLocSpan (getSrcLoc tycon)
- datacons = tyConDataCons tycon
- (from_RDR, to_RDR) = mkGenericNames tycon
+ from0_matches = [mkSimpleHsAlt pat rhs | (pat,rhs) <- from0_alts]
+ to0_matches = [mkSimpleHsAlt pat rhs | (pat,rhs) <- to0_alts ]
+ loc = srcLocSpan (getSrcLoc tycon)
+ datacons = tyConDataCons tycon
+ (from0_RDR, to0_RDR) = mkGenericNames tycon
-- Recurse over the sum first
- from_alts :: [FromAlt]
- (from_alts, to_pat, to_body) = mk_sum_stuff init_us datacons
- init_us = 1::Int -- Unique supply
-
-----------------------------------------------------
--- Dealing with sums
-----------------------------------------------------
-
-mk_sum_stuff :: US -- Base for generating unique names
- -> [DataCon] -- The data constructors
- -> ([FromAlt], -- Alternatives for the T->Trep "from" function
- InPat RdrName, LHsExpr RdrName) -- Arg and body of the Trep->T "to" function
-
--- For example, given
--- data T = C | D Int Int Int
---
--- mk_sum_stuff v [C,D] = ([C -> Inl Unit, D a b c -> Inr (a :*: (b :*: c))],
--- case cd of { Inl u -> C;
--- Inr abc -> case abc of { a :*: bc ->
--- case bc of { b :*: c ->
--- D a b c }} },
--- cd)
-
-mk_sum_stuff us [datacon]
- = ([from_alt], to_pat, to_body_fn app_exp)
- where
- n_args = dataConSourceArity datacon -- Existentials already excluded
-
- datacon_vars = map mkGenericLocal [us .. us+n_args-1]
- us' = us + n_args
-
- datacon_rdr = getRdrName datacon
- app_exp = nlHsVarApps datacon_rdr datacon_vars
- from_alt = (nlConVarPat datacon_rdr datacon_vars, from_alt_rhs)
-
- (_, from_alt_rhs, to_pat, to_body_fn) = mk_prod_stuff us' datacon_vars
-
-mk_sum_stuff us datacons
- = (wrap inlDataCon_RDR l_from_alts ++ wrap inrDataCon_RDR r_from_alts,
- nlVarPat to_arg,
- noLoc (HsCase (nlHsVar to_arg)
- (mkMatchGroup [mkSimpleHsAlt (nlConPat inlDataCon_RDR [l_to_pat]) l_to_body,
- mkSimpleHsAlt (nlConPat inrDataCon_RDR [r_to_pat]) r_to_body])))
+ from0_alts, to0_alts :: [Alt]
+ (from0_alts, to0_alts) = mkSum init_us tycon datacons
+ init_us = 1 :: US -- Unique supply
+-}
+
+--------------------------------------------------------------------------------
+-- Type representation
+--------------------------------------------------------------------------------
+{-
+mkRep0Ty :: TyCon -> LHsType Name
+mkRep0Ty tycon = res
+ where
+ res = d1 `nlHsAppTy` (cons datacons)
+ d1 = nlHsTyVar d1TyConName `nlHsAppTy` nlHsTyVar d1TyConName -- TODO
+ c1 = nlHsTyVar c1TyConName `nlHsAppTy` nlHsTyVar c1TyConName -- TODO
+ s1 = nlHsTyVar s1TyConName `nlHsAppTy` nlHsTyVar noSelTyConName -- TODO
+ plus a b = nlHsTyVar sumTyConName `nlHsAppTy` a `nlHsAppTy` b
+ times a b = nlHsTyVar prodTyConName `nlHsAppTy` a `nlHsAppTy` b
+ k1 x = nlHsTyVar k1TyConName `nlHsAppTy` nlHsTyVar x
+
+ datacons = tyConDataCons tycon
+ n_args datacon = dataConSourceArity datacon
+ datacon_vars datacon = map mkGenericLocal [1 .. n_args datacon]
+
+ cons ds = c1 `nlHsAppTy` sum ds
+ sum [] = nlHsTyVar v1TyConName
+ sum l = foldBal plus (map sel l)
+ sel d = s1 `nlHsAppTy` prod (dataConOrigArgTys d)
+ prod [] = nlHsTyVar u1TyConName
+ prod l = foldBal times (map arg l)
+ arg :: Type -> LHsType Name
+ -- TODO
+ arg t = nlHsTyVar k1TyConName `nlHsAppTy` nlHsTyVar v1TyConName -- TODO
+-}
+
+tc_mkRep0Ty :: -- The type to generate representation for
+ TyCon
+ -- Metadata datatypes to refer to
+ -> MetaTyCons
+ -- Generated representation0 type
+ -> TcM Type
+tc_mkRep0Ty tycon metaDts =
+ do
+ d1 <- tcLookupTyCon d1TyConName
+ c1 <- tcLookupTyCon c1TyConName
+ s1 <- tcLookupTyCon s1TyConName
+ rec0 <- tcLookupTyCon rec0TyConName
+ u1 <- tcLookupTyCon u1TyConName
+ v1 <- tcLookupTyCon v1TyConName
+ plus <- tcLookupTyCon sumTyConName
+ times <- tcLookupTyCon prodTyConName
+ noSel <- tcLookupTyCon noSelTyConName
+ freshTy <- newMetaTyVar TauTv liftedTypeKind
+
+ let mkSum a b = mkTyConApp plus [a,b]
+ mkProd a b = mkTyConApp times [a,b]
+ mkRec0 a = mkTyConApp rec0 [a]
+ mkD a = mkTyConApp d1 [metaDTyCon, sum (tyConDataCons a)]
+ mkC i d a = mkTyConApp c1 [d, prod i (dataConOrigArgTys a)]
+ mkS d a = mkTyConApp s1 [d, a]
+
+ sum [] = mkTyConTy v1
+ sum l = ASSERT (length metaCTyCons == length l)
+ foldBal mkSum [ mkC i d a
+ | (d,(a,i)) <- zip metaCTyCons (zip l [0..]) ]
+ prod :: Int -> [Type] -> Type
+ prod i [] = ASSERT (length metaSTyCons > i)
+ ASSERT (length (metaSTyCons !! i) == 0)
+ mkTyConTy u1
+ prod i l = ASSERT (length metaSTyCons > i)
+ ASSERT (length l == length (metaSTyCons !! i))
+ foldBal mkProd [ arg d a
+ | (d,a) <- zip (metaSTyCons !! i) l ]
+
+ arg d t = mkS d (mkRec0 t)
+
+ metaDTyCon = mkTyConTy (metaD metaDts)
+ metaCTyCons = map mkTyConTy (metaC metaDts)
+ metaSTyCons = map (map mkTyConTy) (metaS metaDts)
+
+ return (mkD tycon)
+
+tc_mkRep0TyCon :: TyCon -- The type to generate representation for
+ -> MetaTyCons -- Metadata datatypes to refer to
+ -> TcM TyCon -- Generated representation0 type
+tc_mkRep0TyCon tycon metaDts =
+-- Consider the example input tycon `D`, where data D a b = D_ a
+ do
+ uniq1 <- newUnique
+ uniq2 <- newUnique
+ -- `rep0Ty` = D1 ... (C1 ... (S1 ... (Rec0 a))) :: * -> *
+ rep0Ty <- tc_mkRep0Ty tycon metaDts
+ -- `rep0` = GHC.Generics.Rep0 (type family)
+ rep0 <- tcLookupTyCon rep0TyConName
+
+ let mod = nameModule (tyConName tycon)
+ loc = nameSrcSpan (tyConName tycon)
+ -- `repName` is a name we generate for the synonym
+ repName = mkExternalName uniq1 mod (mkGenR0 (nameOccName (tyConName tycon))) loc
+ -- `coName` is a name for the coercion
+ coName = mkExternalName uniq2 mod (mkGenR0 (nameOccName (tyConName tycon))) loc
+ -- `tyvars` = [a,b]
+ tyvars = tyConTyVars tycon
+ -- `appT` = D a b
+ appT = [mkTyConApp tycon (mkTyVarTys tyvars)]
+ -- Result
+ res = mkSynTyCon repName
+ -- rep0Ty has kind `kind of D` -> *
+ (tyConKind tycon `mkArrowKind` liftedTypeKind)
+ tyvars (SynonymTyCon rep0Ty)
+ (FamInstTyCon rep0 appT
+ (mkCoercionTyCon coName (tyConArity tycon)
+ -- co : forall a b. Rep0 (D a b) ~ `rep0Ty` a b
+ (CoAxiom tyvars (mkTyConApp rep0 appT) rep0Ty)))
+
+ return res
+
+--------------------------------------------------------------------------------
+-- Meta-information
+--------------------------------------------------------------------------------
+
+data MetaTyCons = MetaTyCons { -- One meta datatype per dataype
+ metaD :: TyCon
+ -- One meta datatype per constructor
+ , metaC :: [TyCon]
+ -- One meta datatype per selector per constructor
+ , metaS :: [[TyCon]] }
+
+instance Outputable MetaTyCons where
+ ppr (MetaTyCons d c s) = ppr d <+> ppr c <+> ppr s
+
+metaTyCons2TyCons :: MetaTyCons -> [TyCon]
+metaTyCons2TyCons (MetaTyCons d c s) = d : c ++ concat s
+
+
+-- Bindings for Datatype, Constructor, and Selector instances
+mkBindsMetaD :: FixityEnv -> TyCon
+ -> ( LHsBinds RdrName -- Datatype instance
+ , [LHsBinds RdrName] -- Constructor instances
+ , [[LHsBinds RdrName]]) -- Selector instances
+mkBindsMetaD fix_env tycon = (dtBinds, allConBinds, allSelBinds)
+ where
+ mkBag l = foldr1 unionBags
+ [ unitBag (L loc (mkFunBind (L loc name) matches))
+ | (name, matches) <- l ]
+ dtBinds = mkBag [ (datatypeName_RDR, dtName_matches)
+ , (moduleName_RDR, moduleName_matches)]
+
+ allConBinds = map conBinds datacons
+ conBinds c = mkBag ( [ (conName_RDR, conName_matches c)]
+ ++ ifElseEmpty (dataConIsInfix c)
+ [ (conFixity_RDR, conFixity_matches c) ]
+ ++ ifElseEmpty (length (dataConFieldLabels c) > 0)
+ [ (conIsRecord_RDR, conIsRecord_matches c) ]
+ ++ ifElseEmpty (isTupleCon c)
+ [(conIsTuple_RDR
+ ,conIsTuple_matches (dataConTyCon c))]
+ )
+
+ ifElseEmpty p x = if p then x else []
+ fixity c = case lookupFixity fix_env (dataConName c) of
+ Fixity n InfixL -> buildFix n leftAssocDataCon_RDR
+ Fixity n InfixR -> buildFix n rightAssocDataCon_RDR
+ Fixity n InfixN -> buildFix n notAssocDataCon_RDR
+ buildFix n assoc = nlHsApps infixDataCon_RDR [nlHsVar assoc
+ , nlHsIntLit (toInteger n)]
+
+ allSelBinds = map (map selBinds) datasels
+ selBinds s = mkBag [(selName_RDR, selName_matches s)]
+
+ loc = srcLocSpan (getSrcLoc tycon)
+ mkStringLHS s = [mkSimpleHsAlt nlWildPat (nlHsLit (mkHsString s))]
+ datacons = tyConDataCons tycon
+ datasels = map dataConFieldLabels datacons
+
+ dtName_matches = mkStringLHS . showPpr . nameOccName . tyConName
+ $ tycon
+ moduleName_matches = mkStringLHS . moduleNameString . moduleName
+ . nameModule . tyConName $ tycon
+
+ conName_matches c = mkStringLHS . showPpr . nameOccName
+ . dataConName $ c
+ conFixity_matches c = [mkSimpleHsAlt nlWildPat (fixity c)]
+ conIsRecord_matches c = [mkSimpleHsAlt nlWildPat (nlHsVar true_RDR)]
+ -- TODO: check that this works
+ conIsTuple_matches c = [mkSimpleHsAlt nlWildPat
+ (nlHsApp (nlHsVar arityDataCon_RDR)
+ (nlHsIntLit
+ (toInteger (tupleTyConArity c))))]
+
+ selName_matches s = mkStringLHS (showPpr (nameOccName s))
+
+
+--------------------------------------------------------------------------------
+-- Dealing with sums
+--------------------------------------------------------------------------------
+
+mkSum :: US -- Base for generating unique names
+ -> TyCon -- The type constructor
+ -> [DataCon] -- The data constructors
+ -> ([Alt], -- Alternatives for the T->Trep "from" function
+ [Alt]) -- Alternatives for the Trep->T "to" function
+
+-- Datatype without any constructors
+mkSum _us tycon [] = ([from_alt], [to_alt])
+ where
+ from_alt = (nlWildPat, mkM1_E (makeError errMsgFrom))
+ to_alt = (mkM1_P nlWildPat, makeError errMsgTo)
+ -- These M1s are meta-information for the datatype
+ makeError s = nlHsApp (nlHsVar error_RDR) (nlHsLit (mkHsString s))
+ errMsgFrom = "No generic representation for empty datatype " ++ showPpr tycon
+ errMsgTo = "No values for empty datatype " ++ showPpr tycon
+
+-- Datatype with at least one constructor
+mkSum us _tycon datacons =
+ unzip [ mk1Sum us i (length datacons) d | (d,i) <- zip datacons [1..] ]
+
+-- Build the sum for a particular constructor
+mk1Sum :: US -- Base for generating unique names
+ -> Int -- The index of this constructor
+ -> Int -- Total number of constructors
+ -> DataCon -- The data constructor
+ -> (Alt, -- Alternative for the T->Trep "from" function
+ Alt) -- Alternative for the Trep->T "to" function
+mk1Sum us i n datacon = (from_alt, to_alt)
where
- (l_datacons, r_datacons) = splitInHalf datacons
- (l_from_alts, l_to_pat, l_to_body) = mk_sum_stuff us' l_datacons
- (r_from_alts, r_to_pat, r_to_body) = mk_sum_stuff us' r_datacons
-
- to_arg = mkGenericLocal us
- us' = us+1
-
- wrap :: RdrName -> [FromAlt] -> [FromAlt]
- -- Wrap an application of the Inl or Inr constructor round each alternative
- wrap dc alts = [(pat, noLoc (HsApp (nlHsVar dc) rhs)) | (pat,rhs) <- alts]
-
-
-----------------------------------------------------
--- Dealing with products
-----------------------------------------------------
-mk_prod_stuff :: US -- Base for unique names
- -> [RdrName] -- arg-ids; args of the original user-defined constructor
- -- They are bound enclosing from_rhs
- -- Please bind these in the to_body_fn
- -> (US, -- Depleted unique-name supply
- LHsExpr RdrName, -- from-rhs: puts together the representation from the arg_ids
- InPat RdrName, -- to_pat:
- LHsExpr RdrName -> LHsExpr RdrName) -- to_body_fn: takes apart the representation
-
--- For example:
--- mk_prod_stuff abc [a,b,c] = ( a :*: (b :*: c),
--- abc,
--- \<body-code> -> case abc of { a :*: bc ->
--- case bc of { b :*: c ->
--- <body-code> )
-
--- We need to use different uniques in the branches
--- because the returned to_body_fns are nested.
--- Hence the returned unqique-name supply
-
-mk_prod_stuff us [] -- Unit case
- = (us+1,
- nlHsVar genUnitDataCon_RDR,
- noLoc (SigPatIn (nlVarPat (mkGenericLocal us))
- (noLoc (HsTyVar (getRdrName genUnitTyConName)))),
- -- Give a signature to the pattern so we get
- -- data S a = Nil | S a
- -- toS = \x -> case x of { Inl (g :: Unit) -> Nil
- -- Inr x -> S x }
- -- The (:: Unit) signature ensures that we'll infer the right
- -- type for toS. If we leave it out, the type is too polymorphic
-
- \x -> x)
-
-mk_prod_stuff us [arg_var] -- Singleton case
- = (us, nlHsVar arg_var, nlVarPat arg_var, \x -> x)
-
-mk_prod_stuff us arg_vars -- Two or more
- = (us'',
- nlHsApps crossDataCon_RDR [l_alt_rhs, r_alt_rhs],
- nlVarPat to_arg,
--- gaw 2004 FIX?
- \x -> noLoc (HsCase (nlHsVar to_arg)
- (mkMatchGroup [mkSimpleHsAlt pat (l_to_body_fn (r_to_body_fn x))])))
+ n_args = dataConSourceArity datacon -- Existentials already excluded
+
+ datacon_vars = map mkGenericLocal [us .. us+n_args-1]
+ us' = us + n_args
+
+ datacon_rdr = getRdrName datacon
+ app_exp = nlHsVarApps datacon_rdr datacon_vars
+
+ from_alt = (nlConVarPat datacon_rdr datacon_vars, from_alt_rhs)
+ from_alt_rhs = mkM1_E (genLR_E i n (mkProd_E us' datacon_vars))
+
+ to_alt = (mkM1_P (genLR_P i n (mkProd_P us' datacon_vars)), to_alt_rhs)
+ -- These M1s are meta-information for the datatype
+ to_alt_rhs = app_exp
+
+-- Generates the L1/R1 sum pattern
+genLR_P :: Int -> Int -> LPat RdrName -> LPat RdrName
+genLR_P i n p
+ | n == 0 = error "impossible"
+ | n == 1 = p
+ | i <= div n 2 = nlConPat l1DataCon_RDR [genLR_P i (div n 2) p]
+ | otherwise = nlConPat r1DataCon_RDR [genLR_P (i-m) (n-m) p]
+ where m = div n 2
+
+-- Generates the L1/R1 sum expression
+genLR_E :: Int -> Int -> LHsExpr RdrName -> LHsExpr RdrName
+genLR_E i n e
+ | n == 0 = error "impossible"
+ | n == 1 = e
+ | i <= div n 2 = nlHsVar l1DataCon_RDR `nlHsApp` genLR_E i (div n 2) e
+ | otherwise = nlHsVar r1DataCon_RDR `nlHsApp` genLR_E (i-m) (n-m) e
+ where m = div n 2
+
+--------------------------------------------------------------------------------
+-- Dealing with products
+--------------------------------------------------------------------------------
+
+-- Build a product expression
+mkProd_E :: US -- Base for unique names
+ -> [RdrName] -- List of variables matched on the lhs
+ -> LHsExpr RdrName -- Resulting product expression
+mkProd_E us [] = mkM1_E (nlHsVar u1DataCon_RDR)
+mkProd_E us vars = mkM1_E (foldBal prod appVars)
+ -- These M1s are meta-information for the constructor
where
- to_arg = mkGenericLocal us
- (l_arg_vars, r_arg_vars) = splitInHalf arg_vars
- (us', l_alt_rhs, l_to_pat, l_to_body_fn) = mk_prod_stuff (us+1) l_arg_vars
- (us'', r_alt_rhs, r_to_pat, r_to_body_fn) = mk_prod_stuff us' r_arg_vars
- pat = nlConPat crossDataCon_RDR [l_to_pat, r_to_pat]
-
-splitInHalf :: [a] -> ([a],[a])
-splitInHalf list = (left, right)
- where
- half = length list `div` 2
- left = take half list
- right = drop half list
+ appVars = map wrapArg_E vars
+ prod a b = prodDataCon_RDR `nlHsApps` [a,b]
+
+-- TODO: Produce a P0 when v is a parameter
+wrapArg_E :: RdrName -> LHsExpr RdrName
+wrapArg_E v = mkM1_E (k1DataCon_RDR `nlHsVarApps` [v])
+ -- This M1 is meta-information for the selector
+
+-- Build a product pattern
+mkProd_P :: US -- Base for unique names
+ -> [RdrName] -- List of variables to match
+ -> LPat RdrName -- Resulting product pattern
+mkProd_P us [] = mkM1_P (nlNullaryConPat u1DataCon_RDR)
+mkProd_P us vars = mkM1_P (foldBal prod appVars)
+ -- These M1s are meta-information for the constructor
+ where
+ appVars = map wrapArg_P vars
+ prod a b = prodDataCon_RDR `nlConPat` [a,b]
+
+-- TODO: Produce a P0 when v is a parameter
+wrapArg_P :: RdrName -> LPat RdrName
+wrapArg_P v = mkM1_P (k1DataCon_RDR `nlConVarPat` [v])
+ -- This M1 is meta-information for the selector
+
mkGenericLocal :: US -> RdrName
mkGenericLocal u = mkVarUnqual (mkFastString ("g" ++ show u))
tc_mod = ASSERT( isExternalName tc_name ) nameModule tc_name
from_RDR = mkOrig tc_mod (mkGenOcc1 tc_occ)
to_RDR = mkOrig tc_mod (mkGenOcc2 tc_occ)
+
+mkM1_E :: LHsExpr RdrName -> LHsExpr RdrName
+mkM1_E e = nlHsVar m1DataCon_RDR `nlHsApp` e
+
+mkM1_P :: LPat RdrName -> LPat RdrName
+mkM1_P p = m1DataCon_RDR `nlConPat` [p]
+
+-- | Variant of foldr1 for producing balanced lists
+foldBal :: (a -> a -> a) -> [a] -> a
+foldBal op = foldBal' op (error "foldBal: empty list")
+
+foldBal' :: (a -> a -> a) -> a -> [a] -> a
+foldBal' _ x [] = x
+foldBal' _ _ [y] = y
+foldBal' op x l = let (a,b) = splitAt (length l `div` 2) l
+ in foldBal' op x a `op` foldBal' op x b
+
\end{code}
%************************************************************************
tyConExtName, -- External name for foreign types
algTyConRhs,
newTyConRhs, newTyConEtadRhs, unwrapNewTyCon_maybe,
- tupleTyConBoxity,
+ tupleTyConBoxity, tupleTyConArity,
-- ** Manipulating TyCons
tcExpandTyCon_maybe, coreExpandTyCon_maybe,
tupleTyConBoxity :: TyCon -> Boxity
tupleTyConBoxity tc = tyConBoxed tc
+-- | Extract the arity of the given 'TyCon', if it is a 'TupleTyCon'.
+-- Panics otherwise
+tupleTyConArity :: TyCon -> Arity
+tupleTyConArity tc = tyConArity tc
+
-- | Is this a recursive 'TyCon'?
isRecursiveTyCon :: TyCon -> Bool
isRecursiveTyCon (AlgTyCon {algTcRec = Recursive}) = True
projects / ghc-hetmet.git / commitdiff