import Var ( TyVar, mkSysTyVar )
import Name ( mkWiredInTyConName )
import PrimRep ( PrimRep(..), isFollowableRep )
-import TyCon ( mkPrimTyCon, TyCon )
+import TyCon ( mkPrimTyCon, TyCon, ArgVrcs )
import Type ( Type,
mkTyConApp, mkTyConTy, mkTyVarTys,
unboxedTypeKind, boxedTypeKind, openTypeKind, mkArrowKinds
openAlphaTyVars :: [TyVar]
openAlphaTyVars = [ mkSysTyVar u openTypeKind
| u <- map mkAlphaTyVarUnique [2..] ]
+
+vrcPos,vrcZero :: (Bool,Bool)
+vrcPos = (True,False)
+vrcZero = (False,False)
+
+vrcsP,vrcsZ,vrcsZP :: ArgVrcs
+vrcsP = [vrcPos]
+vrcsZ = [vrcZero]
+vrcsZP = [vrcZero,vrcPos]
\end{code}
%************************************************************************
\begin{code}
-- only used herein
-pcPrimTyCon :: Unique{-TyConKey-} -> FAST_STRING -> Int -> PrimRep -> TyCon
-pcPrimTyCon key str arity rep
+pcPrimTyCon :: Unique{-TyConKey-} -> FAST_STRING -> Int -> ArgVrcs -> PrimRep -> TyCon
+pcPrimTyCon key str arity arg_vrcs rep
= the_tycon
where
name = mkWiredInTyConName key pREL_GHC str the_tycon
- the_tycon = mkPrimTyCon name kind arity rep
+ the_tycon = mkPrimTyCon name kind arity arg_vrcs rep
kind = mkArrowKinds (take arity (repeat boxedTypeKind)) result_kind
result_kind | isFollowableRep rep = boxedTypeKind -- Represented by a GC-ish ptr
| otherwise = unboxedTypeKind -- Represented by a non-ptr
charPrimTy = mkTyConTy charPrimTyCon
-charPrimTyCon = pcPrimTyCon charPrimTyConKey SLIT("Char#") 0 CharRep
+charPrimTyCon = pcPrimTyCon charPrimTyConKey SLIT("Char#") 0 [] CharRep
intPrimTy = mkTyConTy intPrimTyCon
-intPrimTyCon = pcPrimTyCon intPrimTyConKey SLIT("Int#") 0 IntRep
+intPrimTyCon = pcPrimTyCon intPrimTyConKey SLIT("Int#") 0 [] IntRep
int64PrimTy = mkTyConTy int64PrimTyCon
-int64PrimTyCon = pcPrimTyCon int64PrimTyConKey SLIT("Int64#") 0 Int64Rep
+int64PrimTyCon = pcPrimTyCon int64PrimTyConKey SLIT("Int64#") 0 [] Int64Rep
wordPrimTy = mkTyConTy wordPrimTyCon
-wordPrimTyCon = pcPrimTyCon wordPrimTyConKey SLIT("Word#") 0 WordRep
+wordPrimTyCon = pcPrimTyCon wordPrimTyConKey SLIT("Word#") 0 [] WordRep
word64PrimTy = mkTyConTy word64PrimTyCon
-word64PrimTyCon = pcPrimTyCon word64PrimTyConKey SLIT("Word64#") 0 Word64Rep
+word64PrimTyCon = pcPrimTyCon word64PrimTyConKey SLIT("Word64#") 0 [] Word64Rep
addrPrimTy = mkTyConTy addrPrimTyCon
-addrPrimTyCon = pcPrimTyCon addrPrimTyConKey SLIT("Addr#") 0 AddrRep
+addrPrimTyCon = pcPrimTyCon addrPrimTyConKey SLIT("Addr#") 0 [] AddrRep
floatPrimTy = mkTyConTy floatPrimTyCon
-floatPrimTyCon = pcPrimTyCon floatPrimTyConKey SLIT("Float#") 0 FloatRep
+floatPrimTyCon = pcPrimTyCon floatPrimTyConKey SLIT("Float#") 0 [] FloatRep
doublePrimTy = mkTyConTy doublePrimTyCon
-doublePrimTyCon = pcPrimTyCon doublePrimTyConKey SLIT("Double#") 0 DoubleRep
+doublePrimTyCon = pcPrimTyCon doublePrimTyConKey SLIT("Double#") 0 [] DoubleRep
\end{code}
\begin{code}
mkStatePrimTy ty = mkTyConApp statePrimTyCon [ty]
-statePrimTyCon = pcPrimTyCon statePrimTyConKey SLIT("State#") 1 VoidRep
+statePrimTyCon = pcPrimTyCon statePrimTyConKey SLIT("State#") 1 vrcsZ VoidRep
\end{code}
@_RealWorld@ is deeply magical. It {\em is primitive}, but it
\begin{code}
realWorldTy = mkTyConTy realWorldTyCon
-realWorldTyCon = pcPrimTyCon realWorldTyConKey SLIT("RealWorld") 0 PtrRep
+realWorldTyCon = pcPrimTyCon realWorldTyConKey SLIT("RealWorld") 0 [] PtrRep
realWorldStatePrimTy = mkStatePrimTy realWorldTy
\end{code}
%************************************************************************
\begin{code}
-arrayPrimTyCon = pcPrimTyCon arrayPrimTyConKey SLIT("Array#") 1 ArrayRep
+arrayPrimTyCon = pcPrimTyCon arrayPrimTyConKey SLIT("Array#") 1 vrcsP ArrayRep
-byteArrayPrimTyCon = pcPrimTyCon byteArrayPrimTyConKey SLIT("ByteArray#") 0 ByteArrayRep
+byteArrayPrimTyCon = pcPrimTyCon byteArrayPrimTyConKey SLIT("ByteArray#") 0 [] ByteArrayRep
-mutableArrayPrimTyCon = pcPrimTyCon mutableArrayPrimTyConKey SLIT("MutableArray#") 2 ArrayRep
+mutableArrayPrimTyCon = pcPrimTyCon mutableArrayPrimTyConKey SLIT("MutableArray#")
+ 2 vrcsZP ArrayRep
-mutableByteArrayPrimTyCon = pcPrimTyCon mutableByteArrayPrimTyConKey SLIT("MutableByteArray#") 1 ByteArrayRep
+mutableByteArrayPrimTyCon = pcPrimTyCon mutableByteArrayPrimTyConKey SLIT("MutableByteArray#")
+ 1 vrcsZ ByteArrayRep
mkArrayPrimTy elt = mkTyConApp arrayPrimTyCon [elt]
byteArrayPrimTy = mkTyConTy byteArrayPrimTyCon
%************************************************************************
\begin{code}
-mutVarPrimTyCon = pcPrimTyCon mutVarPrimTyConKey SLIT("MutVar#") 2 PtrRep
+mutVarPrimTyCon = pcPrimTyCon mutVarPrimTyConKey SLIT("MutVar#")
+ 2 vrcsZP PtrRep
mkMutVarPrimTy s elt = mkTyConApp mutVarPrimTyCon [s, elt]
\end{code}
%************************************************************************
\begin{code}
-mVarPrimTyCon = pcPrimTyCon mVarPrimTyConKey SLIT("MVar#") 2 PtrRep
+mVarPrimTyCon = pcPrimTyCon mVarPrimTyConKey SLIT("MVar#")
+ 2 vrcsZP PtrRep
mkMVarPrimTy s elt = mkTyConApp mVarPrimTyCon [s, elt]
\end{code}
%************************************************************************
\begin{code}
-stablePtrPrimTyCon = pcPrimTyCon stablePtrPrimTyConKey SLIT("StablePtr#") 1 StablePtrRep
+stablePtrPrimTyCon = pcPrimTyCon stablePtrPrimTyConKey SLIT("StablePtr#")
+ 1 vrcsP StablePtrRep
mkStablePtrPrimTy ty = mkTyConApp stablePtrPrimTyCon [ty]
\end{code}
%************************************************************************
\begin{code}
-stableNamePrimTyCon = pcPrimTyCon stableNamePrimTyConKey SLIT("StableName#") 1 StableNameRep
+stableNamePrimTyCon = pcPrimTyCon stableNamePrimTyConKey SLIT("StableName#")
+ 1 vrcsP StableNameRep
mkStableNamePrimTy ty = mkTyConApp stableNamePrimTyCon [ty]
\end{code}
\begin{code}
foreignObjPrimTy = mkTyConTy foreignObjPrimTyCon
-foreignObjPrimTyCon = pcPrimTyCon foreignObjPrimTyConKey SLIT("ForeignObj#") 0 ForeignObjRep
+foreignObjPrimTyCon = pcPrimTyCon foreignObjPrimTyConKey SLIT("ForeignObj#") 0 [] ForeignObjRep
\end{code}
%************************************************************************
%************************************************************************
\begin{code}
-weakPrimTyCon = pcPrimTyCon weakPrimTyConKey SLIT("Weak#") 1 WeakPtrRep
+weakPrimTyCon = pcPrimTyCon weakPrimTyConKey SLIT("Weak#") 1 vrcsP WeakPtrRep
mkWeakPrimTy v = mkTyConApp weakPrimTyCon [v]
\end{code}
\begin{code}
threadIdPrimTy = mkTyConTy threadIdPrimTyCon
-threadIdPrimTyCon = pcPrimTyCon threadIdPrimTyConKey SLIT("ThreadId#") 0 ThreadIdRep
+threadIdPrimTyCon = pcPrimTyCon threadIdPrimTyConKey SLIT("ThreadId#") 0 [] ThreadIdRep
\end{code}
%************************************************************************
import Name ( mkWiredInTyConName, mkWiredInIdName, mkSrcOccFS, dataName )
import DataCon ( DataCon, mkDataCon )
import Var ( TyVar, tyVarKind )
-import TyCon ( TyCon, mkAlgTyCon, mkSynTyCon, mkTupleTyCon )
+import TyCon ( TyCon, ArgVrcs, mkAlgTyCon, mkSynTyCon, mkTupleTyCon )
import BasicTypes ( Arity, NewOrData(..),
RecFlag(..), StrictnessMark(..) )
import Type ( Type, mkTyConTy, mkTyConApp, mkSigmaTy, mkTyVarTys,
pcRecDataTyCon, pcNonRecDataTyCon, pcNonRecNewTyCon
:: Unique{-TyConKey-} -> Module -> FAST_STRING
- -> [TyVar] -> [DataCon] -> TyCon
+ -> [TyVar] -> ArgVrcs -> [DataCon] -> TyCon
pcRecDataTyCon = pcTyCon DataType Recursive
pcNonRecDataTyCon = pcTyCon DataType NonRecursive
pcNonRecNewTyCon = pcTyCon NewType NonRecursive
-pcTyCon new_or_data is_rec key mod str tyvars cons
+pcTyCon new_or_data is_rec key mod str tyvars argvrcs cons
= tycon
where
tycon = mkAlgTyCon name kind
tyvars
[] -- No context
+ argvrcs
cons
[] -- No derivings
Nothing -- Not a dictionary
name = mkWiredInTyConName key mod str tycon
kind = mkArrowKinds (map tyVarKind tyvars) boxedTypeKind
-pcSynTyCon key mod str kind arity tyvars expansion
+pcSynTyCon key mod str kind arity tyvars expansion argvrcs -- this fun never used!
= tycon
where
- tycon = mkSynTyCon name kind arity tyvars expansion
+ tycon = mkSynTyCon name kind arity tyvars expansion argvrcs
name = mkWiredInTyConName key mod str tycon
pcDataCon :: Unique{-DataConKey-} -> Module -> FAST_STRING
\begin{code}
charTy = mkTyConTy charTyCon
-charTyCon = pcNonRecDataTyCon charTyConKey pREL_BASE SLIT("Char") [] [charDataCon]
+charTyCon = pcNonRecDataTyCon charTyConKey pREL_BASE SLIT("Char") [] [] [charDataCon]
charDataCon = pcDataCon charDataConKey pREL_BASE SLIT("C#") [] [] [charPrimTy] charTyCon
stringTy = mkListTy charTy -- convenience only
\begin{code}
intTy = mkTyConTy intTyCon
-intTyCon = pcNonRecDataTyCon intTyConKey pREL_BASE SLIT("Int") [] [intDataCon]
+intTyCon = pcNonRecDataTyCon intTyConKey pREL_BASE SLIT("Int") [] [] [intDataCon]
intDataCon = pcDataCon intDataConKey pREL_BASE SLIT("I#") [] [] [intPrimTy] intTyCon
isIntTy :: Type -> Bool
wordTy = mkTyConTy wordTyCon
-wordTyCon = pcNonRecDataTyCon wordTyConKey pREL_ADDR SLIT("Word") [] [wordDataCon]
+wordTyCon = pcNonRecDataTyCon wordTyConKey pREL_ADDR SLIT("Word") [] [] [wordDataCon]
wordDataCon = pcDataCon wordDataConKey pREL_ADDR SLIT("W#") [] [] [wordPrimTy] wordTyCon
\end{code}
\begin{code}
addrTy = mkTyConTy addrTyCon
-addrTyCon = pcNonRecDataTyCon addrTyConKey pREL_ADDR SLIT("Addr") [] [addrDataCon]
+addrTyCon = pcNonRecDataTyCon addrTyConKey pREL_ADDR SLIT("Addr") [] [] [addrDataCon]
addrDataCon = pcDataCon addrDataConKey pREL_ADDR SLIT("A#") [] [] [addrPrimTy] addrTyCon
isAddrTy :: Type -> Bool
\begin{code}
floatTy = mkTyConTy floatTyCon
-floatTyCon = pcNonRecDataTyCon floatTyConKey pREL_BASE SLIT("Float") [] [floatDataCon]
+floatTyCon = pcNonRecDataTyCon floatTyConKey pREL_BASE SLIT("Float") [] [] [floatDataCon]
floatDataCon = pcDataCon floatDataConKey pREL_BASE SLIT("F#") [] [] [floatPrimTy] floatTyCon
isFloatTy :: Type -> Bool
Just (tycon, [], _) -> getUnique tycon == doubleTyConKey
_ -> False
-doubleTyCon = pcNonRecDataTyCon doubleTyConKey pREL_BASE SLIT("Double") [] [doubleDataCon]
+doubleTyCon = pcNonRecDataTyCon doubleTyConKey pREL_BASE SLIT("Double") [] [] [doubleDataCon]
doubleDataCon = pcDataCon doubleDataConKey pREL_BASE SLIT("D#") [] [] [doublePrimTy] doubleTyCon
\end{code}
\begin{code}
stablePtrTyCon
= pcNonRecDataTyCon stablePtrTyConKey pREL_STABLE SLIT("StablePtr")
- alpha_tyvar [stablePtrDataCon]
+ alpha_tyvar [(True,False)] [stablePtrDataCon]
where
stablePtrDataCon
= pcDataCon stablePtrDataConKey pREL_STABLE SLIT("StablePtr")
\begin{code}
foreignObjTyCon
= pcNonRecDataTyCon foreignObjTyConKey pREL_IO_BASE SLIT("ForeignObj")
- [] [foreignObjDataCon]
+ [] [] [foreignObjDataCon]
where
foreignObjDataCon
= pcDataCon foreignObjDataConKey pREL_IO_BASE SLIT("ForeignObj")
integerTy :: Type
integerTy = mkTyConTy integerTyCon
-integerTyCon = pcNonRecDataTyCon integerTyConKey pREL_BASE SLIT("Integer") [] [smallIntegerDataCon, largeIntegerDataCon]
+integerTyCon = pcNonRecDataTyCon integerTyConKey pREL_BASE SLIT("Integer")
+ [] [] [smallIntegerDataCon, largeIntegerDataCon]
smallIntegerDataCon = pcDataCon smallIntegerDataConKey pREL_BASE SLIT("S#")
[] [] [intPrimTy] integerTyCon
boolTy = mkTyConTy boolTyCon
boolTyCon = pcTyCon EnumType NonRecursive boolTyConKey
- pREL_BASE SLIT("Bool") [] [falseDataCon, trueDataCon]
+ pREL_BASE SLIT("Bool") [] [] [falseDataCon, trueDataCon]
falseDataCon = pcDataCon falseDataConKey pREL_BASE SLIT("False") [] [] [] boolTyCon
trueDataCon = pcDataCon trueDataConKey pREL_BASE SLIT("True") [] [] [] boolTyCon
alphaListTy = mkSigmaTy alpha_tyvar [] (mkTyConApp listTyCon alpha_ty)
listTyCon = pcRecDataTyCon listTyConKey pREL_BASE SLIT("[]")
- alpha_tyvar [nilDataCon, consDataCon]
+ alpha_tyvar [(True,False)] [nilDataCon, consDataCon]
nilDataCon = pcDataCon nilDataConKey pREL_BASE SLIT("[]") alpha_tyvar [] [] listTyCon
consDataCon = pcDataCon consDataConKey pREL_BASE SLIT(":")
import Inst ( InstanceMapper )
import TcClassDcl ( kcClassDecl, tcClassDecl1 )
import TcEnv ( ValueEnv, TcTyThing(..),
- tcExtendTypeEnv
+ tcExtendTypeEnv, getAllEnvTyCons
)
import TcTyDecls ( tcTyDecl, kcTyDecl )
import TcMonoType ( kcHsTyVar )
import TcType ( TcKind, newKindVar, newKindVars, kindToTcKind, zonkTcKindToKind )
-import Type ( mkArrowKind, boxedTypeKind )
+import Type ( mkArrowKind, boxedTypeKind, mkDictTy )
+ -- next two imports for usage stuff only
+import TyCon ( ArgVrcs, tyConKind, tyConArity, tyConDataCons, tyConTyVars,
+ tyConArgVrcs_maybe, getSynTyConDefn, isSynTyCon, isAlgTyCon )
+import DataCon ( dataConRawArgTys, dataConSig )
+
import Class ( Class, classBigSig )
-import Var ( tyVarKind )
+import Type ( Type(..), TyNote(..), tyVarsOfTypes )
+import Var ( TyVar, tyVarKind )
+import FiniteMap
import Bag
+import VarSet
import Digraph ( stronglyConnComp, SCC(..) )
import Name ( Name, NamedThing(..), getSrcLoc, isTvOcc, nameOccName )
import Outputable
-import Maybes ( mapMaybe )
+import Maybes ( mapMaybe, expectJust )
import UniqSet ( UniqSet, emptyUniqSet,
unitUniqSet, unionUniqSets,
unionManyUniqSets, uniqSetToList )
Dealing with a group
~~~~~~~~~~~~~~~~~~~~
+The knot-tying parameters: @rec_tyclss@ is an alist mapping @Name@s to
+@TcTyThing@s. @rec_vrcs@ is a finite map from @Name@s to @ArgVrcs@s.
+
\begin{code}
tcGroup :: ValueEnv -> InstanceMapper -> SCC RenamedTyClDecl -> TcM s TcEnv
tcGroup unf_env inst_mapper scc
-- Tie the knot
-- traceTc (ppr (map fst ty_env_stuff1)) `thenTc_`
- fixTc ( \ ~(rec_tyclss, _) ->
+ fixTc ( \ ~(rec_tyclss, rec_vrcs, _) ->
let
rec_env = listToUFM rec_tyclss
in
-- Do type checking
mapNF_Tc (getTyBinding2 rec_env) ty_env_stuff1 `thenNF_Tc` \ ty_env_stuff2 ->
tcExtendTypeEnv ty_env_stuff2 $
- mapTc (tcDecl is_rec_group unf_env inst_mapper) decls `thenTc` \ tyclss ->
+ mapTc (tcDecl is_rec_group unf_env inst_mapper rec_vrcs) decls
+ `thenTc` \ tyclss ->
tcGetEnv `thenTc` \ env ->
- returnTc (tyclss, env)
- ) `thenTc` \ (_, env) ->
+ let
+ tycons = getAllEnvTyCons env
+ vrcs = calcTyConArgVrcs tycons
+ in
+
+ returnTc (tyclss, vrcs, env)
+ ) `thenTc` \ (_, _, env) ->
-- traceTc (text "done" <+> ppr (map fst ty_env_stuff1)) `thenTc_`
returnTc env
where
kcTyDecl decl
tcDecl :: RecFlag -- True => recursive group
- -> ValueEnv -> InstanceMapper
+ -> ValueEnv -> InstanceMapper -> FiniteMap Name ArgVrcs
-> RenamedTyClDecl -> TcM s (Name, TcTyThing)
-tcDecl is_rec_group unf_env inst_mapper decl
+tcDecl is_rec_group unf_env inst_mapper vrcs_env decl
= tcAddDeclCtxt decl $
-- traceTc (text "Starting" <+> ppr name) `thenTc_`
if isClassDecl decl then
- tcClassDecl1 unf_env inst_mapper decl `thenTc` \ clas ->
+ tcClassDecl1 unf_env inst_mapper vrcs_env decl `thenTc` \ clas ->
-- traceTc (text "Finished" <+> ppr name) `thenTc_`
returnTc (getName clas, AClass clas)
else
- tcTyDecl is_rec_group decl `thenTc` \ tycon ->
+ tcTyDecl is_rec_group vrcs_env decl `thenTc` \ tycon ->
-- traceTc (text "Finished" <+> ppr name) `thenTc_`
returnTc (getName tycon, ATyCon tycon)
= set_name listTyCon_name `unionUniqSets` get_ty ty
get_ty (MonoTupleTy tys boxed)
= set_name (tupleTyCon_name boxed (length tys)) `unionUniqSets` get_tys tys
+get_ty (MonoUsgTy _ ty)
+ = get_ty ty
get_ty (HsForAllTy _ ctxt mty)
= get_ctxt ctxt `unionUniqSets` get_ty mty
-get_ty other = panic "TcTyClsDecls:get_ty"
+get_ty (MonoDictTy name _)
+ = set_name name
----------------------------------------------------
get_tys tys
where
name = tyClDeclName decl
\end{code}
+
+
+Computing the tyConArgVrcs info
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+@tyConArgVrcs@ gives a list of (occPos,occNeg) flags, one for each
+tyvar. For @AlgTyCon@s and @SynTyCon@s, this info must be precomputed
+separately. Note that this is information about occurrences of type
+variables, not usages of term variables.
+
+The function @calcTyConArgVrcs@ must be passed a list of *algebraic or
+syntycons only* such that all tycons referred to (by mutual recursion)
+appear in the list. The fixpointing will be done on this set of
+tycons as a whole. It returns a list of @tyconVrcInfo@ data, ready to
+be (knot-tyingly?) stuck back into the appropriate fields.
+
+\begin{code}
+calcTyConArgVrcs :: [TyCon]
+ -> FiniteMap Name ArgVrcs
+
+calcTyConArgVrcs tycons
+ = let oi = foldl (\fm tc -> addToFM fm tc (initial tc)) emptyFM tycons
+ initial tc = if isAlgTyCon tc && null (tyConDataCons tc) then
+ -- make pessimistic assumption (and warn)
+ take (tyConArity tc) abstractVrcs
+ else
+ replicate (tyConArity tc) (False,False)
+ oi'' = tcaoFix oi
+ go (tc,vrcs) = (getName tc,vrcs)
+ in listToFM (map go (fmToList oi''))
+
+ where
+
+ tcaoFix :: FiniteMap TyCon ArgVrcs -- initial ArgVrcs per tycon
+ -> FiniteMap TyCon ArgVrcs -- fixpointed ArgVrcs per tycon
+
+ tcaoFix oi = let (changed,oi') = foldFM (\ tc pms
+ (changed,oi')
+ -> let pms' = tcaoIter oi' tc -- seq not simult
+ in (changed || (pms /= pms'),
+ addToFM oi' tc pms'))
+ (False,oi) -- seq not simult for faster fixpting
+ oi
+ in if changed
+ then tcaoFix oi'
+ else oi'
+
+ tcaoIter :: FiniteMap TyCon ArgVrcs -- reference ArgVrcs (initial)
+ -> TyCon -- tycon to update
+ -> ArgVrcs -- new ArgVrcs for tycon
+
+ tcaoIter oi tc | isAlgTyCon tc
+ = let cs = tyConDataCons tc
+ vs = tyConTyVars tc
+ argtys = concatMap dataConRawArgTys cs
+ exdicttys = concatMap ((\ (_,_,_,exth,_,_) -> map (uncurry mkDictTy) exth)
+ . dataConSig) cs
+ myfao tc = lookupWithDefaultFM oi (expectJust "tcaoIter(Alg)" $
+ tyConArgVrcs_maybe tc)
+ tc
+ -- we use the already-computed result for tycons not in this SCC
+ in map (\v -> anyVrc (\ty -> vrcInTy myfao v ty) (exdicttys ++ argtys))
+ vs
+
+ tcaoIter oi tc | isSynTyCon tc
+ = let (tyvs,ty) = getSynTyConDefn tc
+ myfao tc = lookupWithDefaultFM oi (expectJust "tcaoIter(Syn)" $
+ tyConArgVrcs_maybe tc)
+ tc
+ -- we use the already-computed result for tycons not in this SCC
+ in map (\v -> vrcInTy myfao v ty) tyvs
+
+
+abstractVrcs :: ArgVrcs
+-- we pull this out as a CAF so the warning only appears *once*
+abstractVrcs = trace ("WARNING: tyConArgVrc info inaccurate due to unavailable constructors.\n"
+ ++ "\tUse -fno-prune-tydecls to fix.") $
+ repeat (True,True)
+\end{code}
+
+And a general variance-check function. We pass a function for
+determining the @ArgVrc@s of a tycon; when fixpointing this refers to
+the current value; otherwise this should be looked up from the tycon's
+own tyConArgVrcs.
+
+\begin{code}
+vrcInTy :: (TyCon -> ArgVrcs) -- function to get argVrcs of a tycon (break out of recursion)
+ -> TyVar -- tyvar to check Vrcs of
+ -> Type -- type to check for occ in
+ -> (Bool,Bool) -- (occurs positively, occurs negatively)
+
+vrcInTy fao v (NoteTy (UsgNote _) ty) = vrcInTy fao v ty
+
+vrcInTy fao v (NoteTy (SynNote _) ty) = vrcInTy fao v ty
+ -- SynTyCon doesn't neccessarily have vrcInfo at this point,
+ -- so don't try and use it
+
+vrcInTy fao v (NoteTy (FTVNote ftv) ty) = if elemVarSet v ftv
+ then vrcInTy fao v ty
+ else (False,False)
+ -- note that ftv cannot be calculated as occPos||occNeg,
+ -- since if a tyvar occurs only as unused tyconarg,
+ -- occPos==occNeg==False, but ftv=True
+
+vrcInTy fao v (TyVarTy v') = if v==v'
+ then (True,False)
+ else (False,False)
+
+vrcInTy fao v (AppTy ty1 ty2) = if vrcInTy fao v ty2 /= (False,False)
+ then (True,True)
+ else vrcInTy fao v ty1
+ -- ty1 is probably unknown (or it would have been beta-reduced);
+ -- hence if v occurs in ty2 at all then it could occur with
+ -- either variance. Otherwise it occurs as it does in ty1.
+
+vrcInTy fao v (FunTy ty1 ty2) = let (p1,m1) = vrcInTy fao v ty1
+ (p2,m2) = vrcInTy fao v ty2
+ in (m1||p2,p1||m2)
+
+vrcInTy fao v (ForAllTy v' ty) = if v==v'
+ then (False,False)
+ else vrcInTy fao v ty
+
+vrcInTy fao v (TyConApp tc tys) = let pms1 = map (vrcInTy fao v) tys
+ pms2 = fao tc
+ in orVrcs (zipWith timesVrc pms1 pms2)
+
+orVrc :: (Bool,Bool) -> (Bool,Bool) -> (Bool,Bool)
+orVrc (p1,m1) (p2,m2) = (p1||p2,m1||m2)
+
+orVrcs :: [(Bool,Bool)] -> (Bool,Bool)
+orVrcs = foldl orVrc (False,False)
+
+anyVrc :: (a -> (Bool,Bool)) -> [a] -> (Bool,Bool)
+anyVrc p as = foldl (\pm a -> pm `orVrc` p a) (False,False) as
+
+timesVrc :: (Bool,Bool) -> (Bool,Bool) -> (Bool,Bool)
+timesVrc (p1,m1) (p2,m2) = (p1 && p2 || m1 && m2,
+ p1 && m2 || m1 && p2)
+\end{code}
+
+
import CoreUnfold ( getUnfoldingTemplate )
import FieldLabel
import Var ( Id, TyVar )
-import Name ( isLocallyDefined, OccName, NamedThing(..) )
+import Name ( Name, isLocallyDefined, OccName, NamedThing(..) )
import Outputable
-import TyCon ( TyCon, mkSynTyCon, mkAlgTyCon, isAlgTyCon,
+import TyCon ( TyCon, ArgVrcs, mkSynTyCon, mkAlgTyCon, isAlgTyCon,
isSynTyCon, tyConDataCons, isNewTyCon
)
import Type ( getTyVar, tyVarsOfTypes,
import Var ( tyVarKind )
import VarSet ( intersectVarSet, isEmptyVarSet )
import Util ( equivClasses )
+import FiniteMap ( FiniteMap, lookupWithDefaultFM )
\end{code}
%************************************************************************
%************************************************************************
\begin{code}
-tcTyDecl :: RecFlag -> RenamedTyClDecl -> TcM s TyCon
+tcTyDecl :: RecFlag -> FiniteMap Name ArgVrcs -> RenamedTyClDecl -> TcM s TyCon
-tcTyDecl is_rec (TySynonym tycon_name tyvar_names rhs src_loc)
+tcTyDecl is_rec rec_vrcs (TySynonym tycon_name tyvar_names rhs src_loc)
= tcLookupTy tycon_name `thenNF_Tc` \ (tycon_kind, Just arity, _) ->
tcExtendTopTyVarScope tycon_kind tyvar_names $ \ tyvars _ ->
tcHsTopType rhs `thenTc` \ rhs_ty ->
let
-- Construct the tycon
- tycon = mkSynTyCon tycon_name tycon_kind arity tyvars rhs_ty
+ argvrcs = lookupWithDefaultFM rec_vrcs (pprPanic "tcTyDecl: argvrcs:" $ ppr tycon_name)
+ tycon_name
+ tycon = mkSynTyCon tycon_name tycon_kind arity tyvars rhs_ty argvrcs
in
returnTc tycon
-tcTyDecl is_rec (TyData data_or_new context tycon_name tyvar_names con_decls derivings pragmas src_loc)
+tcTyDecl is_rec rec_vrcs (TyData data_or_new context tycon_name tyvar_names con_decls derivings pragmas src_loc)
= -- Lookup the pieces
tcLookupTy tycon_name `thenNF_Tc` \ (tycon_kind, _, ATyCon rec_tycon) ->
tcExtendTopTyVarScope tycon_kind tyvar_names $ \ tyvars _ ->
DataType | all isNullaryDataCon data_cons -> EnumType
| otherwise -> DataType
- tycon = mkAlgTyCon tycon_name tycon_kind tyvars ctxt
+ argvrcs = lookupWithDefaultFM rec_vrcs (pprPanic "tcTyDecl: argvrcs:" $ ppr tycon_name)
+ tycon_name
+
+ tycon = mkAlgTyCon tycon_name tycon_kind tyvars ctxt argvrcs
data_cons
derived_classes
Nothing -- Not a dictionary
\begin{code}
module TyCon(
- TyCon, KindCon, SuperKindCon,
+ TyCon, KindCon, SuperKindCon, ArgVrcs,
isFunTyCon, isUnLiftedTyCon, isBoxedTyCon, isProductTyCon,
isAlgTyCon, isDataTyCon, isSynTyCon, isNewTyCon, isPrimTyCon,
tyConKind,
tyConUnique,
tyConTyVars,
+ tyConArgVrcs_maybe,
tyConDataCons,
tyConFamilySize,
tyConDerivings,
tyConKind :: Kind,
tyConArity :: Arity,
- tyConTyVars :: [TyVar],
- dataTyConTheta :: [(Class,[Type])],
+ tyConTyVars :: [TyVar],
+ dataTyConTheta :: [(Class,[Type])],
+ dataTyConArgVrcs :: ArgVrcs,
dataCons :: [DataCon],
-- Its data constructors, with fully polymorphic types
tyConName :: Name,
tyConKind :: Kind,
tyConArity :: Arity,
+ primTyConArgVrcs :: ArgVrcs,
primTyConRep :: PrimRep
}
tyConKind :: Kind,
tyConArity :: Arity,
- tyConTyVars :: [TyVar], -- Bound tyvars
- synTyConDefn :: Type -- Right-hand side, mentioning these type vars.
+ tyConTyVars :: [TyVar], -- Bound tyvars
+ synTyConDefn :: Type, -- Right-hand side, mentioning these type vars.
-- Acts as a template for the expansion when
-- the tycon is applied to some types.
+ synTyConArgVrcs :: ArgVrcs
}
| KindCon { -- Type constructor at the kind level
tyConUnique :: Unique,
tyConName :: Name
}
+
+type ArgVrcs = [(Bool,Bool)] -- Tyvar variance info: [(occPos,occNeg)]
+ -- *NB*: this is tyvar variance info, *not*
+ -- termvar usage info.
\end{code}
%************************************************************************
tyConArity = 2
}
-mkAlgTyCon name kind tyvars theta cons derivs maybe_clas flavour rec
+mkAlgTyCon name kind tyvars theta argvrcs cons derivs maybe_clas flavour rec
= AlgTyCon {
tyConName = name,
tyConUnique = nameUnique name,
tyConArity = length tyvars,
tyConTyVars = tyvars,
dataTyConTheta = theta,
+ dataTyConArgVrcs = argvrcs,
dataCons = cons,
dataTyConDerivings = derivs,
dataTyConClass_maybe = maybe_clas,
dataCon = con
}
-mkPrimTyCon name kind arity rep
+mkPrimTyCon name kind arity arg_vrcs rep
= PrimTyCon {
tyConName = name,
tyConUnique = nameUnique name,
tyConKind = kind,
tyConArity = arity,
+ primTyConArgVrcs = arg_vrcs,
primTyConRep = rep
}
-mkSynTyCon name kind arity tyvars rhs
+mkSynTyCon name kind arity tyvars rhs argvrcs
= SynTyCon {
tyConName = name,
tyConUnique = nameUnique name,
tyConKind = kind,
tyConArity = arity,
tyConTyVars = tyvars,
- synTyConDefn = rhs
+ synTyConDefn = rhs,
+ synTyConArgVrcs = argvrcs
}
setTyConName tc name = tc {tyConName = name, tyConUnique = nameUnique name}
-- should ask about anything else
\end{code}
+@tyConArgVrcs_maybe@ gives a list of (occPos,occNeg) flags, one for
+each tyvar, if available. See @calcAlgTyConArgVrcs@ for how this is
+actually computed (in another file).
+
+\begin{code}
+tyConArgVrcs_maybe :: TyCon -> Maybe ArgVrcs
+
+tyConArgVrcs_maybe (FunTyCon {} ) = Just [(False,True),(True,False)]
+tyConArgVrcs_maybe (AlgTyCon {dataTyConArgVrcs = oi}) = Just oi
+tyConArgVrcs_maybe (PrimTyCon {primTyConArgVrcs = oi}) = Just oi
+tyConArgVrcs_maybe (TupleTyCon {tyConArity = arity }) = Just (replicate arity (True,False))
+tyConArgVrcs_maybe (SynTyCon {synTyConArgVrcs = oi }) = Just oi
+tyConArgVrcs_maybe _ = Nothing
+\end{code}
+
\begin{code}
getSynTyConDefn :: TyCon -> ([TyVar], Type)
getSynTyConDefn (SynTyCon {tyConTyVars = tyvars, synTyConDefn = ty}) = (tyvars,ty)
maybeTyConSingleCon (AlgTyCon {}) = Nothing
maybeTyConSingleCon (TupleTyCon {dataCon = con}) = Just con
maybeTyConSingleCon (PrimTyCon {}) = Nothing
-maybeTyConSingleCon other = panic (showSDoc (ppr other))
+maybeTyConSingleCon (FunTyCon {}) = Nothing -- case at funty
+maybeTyConSingleCon tc = pprPanic "maybeTyConSingleCon: unexpected tycon " $
+ ppr tc
\end{code}
\begin{code}
projects / ghc-hetmet.git / commitdiff