Inst(..), -- Visible only to TcSimplify
InstOrigin(..), OverloadedLit(..),
- LIE(..), emptyLIE, unitLIE, plusLIE, consLIE, zonkLIE, plusLIEs,
+ SYN_IE(LIE), emptyLIE, unitLIE, plusLIE, consLIE, zonkLIE, plusLIEs,
- InstanceMapper(..),
+ SYN_IE(InstanceMapper),
newDicts, newDictsAtLoc, newMethod, newMethodWithGivenTy, newOverloadedLit,
- instType, tyVarsOfInst, lookupInst,
+ instType, tyVarsOfInst, lookupInst, lookupSimpleInst,
isDict, isTyVarDict,
zonkInst, instToId,
matchesInst,
- instBindingRequired, instCanBeGeneralised
-
+ instBindingRequired, instCanBeGeneralised,
+
+ pprInst
) where
-import Ubiq
+IMP_Ubiq()
+IMPORT_1_3(Ratio(Rational))
import HsSyn ( HsLit(..), HsExpr(..), HsBinds,
- InPat, OutPat, Stmt, Qual, Match,
+ InPat, OutPat, Stmt, Qualifier, Match,
ArithSeqInfo, PolyType, Fake )
-import RnHsSyn ( RenamedArithSeqInfo(..), RenamedHsExpr(..) )
-import TcHsSyn ( TcIdOcc(..), TcExpr(..), TcIdBndr(..),
- mkHsTyApp, mkHsDictApp )
+import RnHsSyn ( SYN_IE(RenamedArithSeqInfo), SYN_IE(RenamedHsExpr),
+ RnName{-instance NamedThing-}
+ )
+import TcHsSyn ( TcIdOcc(..), SYN_IE(TcExpr), SYN_IE(TcIdBndr),
+ mkHsTyApp, mkHsDictApp, tcIdTyVars )
-import TcMonad
-import TcEnv ( tcLookupGlobalValueByKey )
-import TcType ( TcType(..), TcRhoType(..), TcMaybe, TcTyVarSet(..),
- tcInstType, tcInstTcType, zonkTcType )
+import TcMonad hiding ( rnMtoTcM )
+import TcEnv ( tcLookupGlobalValueByKey, tcLookupTyConByKey )
+import TcType ( SYN_IE(TcType), SYN_IE(TcRhoType), TcMaybe, SYN_IE(TcTyVarSet),
+ tcInstType, zonkTcType )
import Bag ( emptyBag, unitBag, unionBags, unionManyBags, listToBag, consBag )
-import Class ( Class(..), GenClass, ClassInstEnv(..), classInstEnv )
+import Class ( isCcallishClass, isNoDictClass, classInstEnv,
+ SYN_IE(Class), GenClass, SYN_IE(ClassInstEnv), SYN_IE(ClassOp)
+ )
+import ErrUtils ( addErrLoc, SYN_IE(Error) )
import Id ( GenId, idType, mkInstId )
import MatchEnv ( lookupMEnv, insertMEnv )
import Name ( mkLocalName, getLocalName, Name )
import Outputable
-import PprType ( GenClass, TyCon, GenType, GenTyVar )
+import PprType ( GenClass, TyCon, GenType, GenTyVar, pprParendGenType )
import PprStyle ( PprStyle(..) )
import Pretty
-import RnHsSyn ( RnName{-instance NamedThing-} )
-import SpecEnv ( SpecEnv(..) )
+import SpecEnv ( SpecEnv )
import SrcLoc ( SrcLoc, mkUnknownSrcLoc )
-import Type ( GenType, eqSimpleTy,
+import Type ( GenType, eqSimpleTy, instantiateTy,
isTyVarTy, mkDictTy, splitForAllTy, splitSigmaTy,
- splitRhoTy, matchTy, tyVarsOfType, tyVarsOfTypes )
-import TyVar ( GenTyVar )
+ splitRhoTy, matchTy, tyVarsOfType, tyVarsOfTypes,
+ mkSynTy
+ )
+import TyVar ( unionTyVarSets, GenTyVar )
import TysPrim ( intPrimTy )
-import TysWiredIn ( intDataCon )
-import Unique ( Unique, showUnique,
- fromRationalClassOpKey, fromIntClassOpKey, fromIntegerClassOpKey )
-import Util ( panic, zipEqual, zipWithEqual, assoc, assertPanic )
-
+import TysWiredIn ( intDataCon, integerTy )
+import Unique ( showUnique, fromRationalClassOpKey, rationalTyConKey,
+ fromIntClassOpKey, fromIntegerClassOpKey, Unique
+ )
+import Util ( panic, zipEqual, zipWithEqual, assoc, assertPanic, pprTrace{-ToDo:rm-} )
\end{code}
%************************************************************************
tcGetUniques (length theta) `thenNF_Tc` \ new_uniqs ->
let
mk_dict u (clas, ty) = Dict u clas ty orig loc
- dicts = zipWithEqual mk_dict new_uniqs theta
+ dicts = zipWithEqual "newDicts" mk_dict new_uniqs theta
in
returnNF_Tc (listToBag dicts, map instToId dicts)
= tcGetUniques (length theta) `thenNF_Tc` \ new_uniqs ->
let
mk_dict u (clas, ty) = Dict u clas ty orig loc
- dicts = zipWithEqual mk_dict new_uniqs theta
+ dicts = zipWithEqual "newDictsAtLoc" mk_dict new_uniqs theta
in
returnNF_Tc (dicts, map instToId dicts)
= -- Get the Id type and instantiate it at the specified types
(case id of
RealId id -> let (tyvars, rho) = splitForAllTy (idType id)
- in tcInstType (tyvars `zipEqual` tys) rho
+ in
+ (if length tyvars /= length tys then pprTrace "newMethod" (ppr PprDebug (idType id)) else \x->x) $
+ tcInstType (zip{-Equal "newMethod"-} tyvars tys) rho
TcId id -> let (tyvars, rho) = splitForAllTy (idType id)
- in tcInstTcType (tyvars `zipEqual` tys) rho
+ in returnNF_Tc (instantiateTy (zipEqual "newMethod(2)" tyvars tys) rho)
) `thenNF_Tc` \ rho_ty ->
-- Our friend does the rest
newMethodWithGivenTy orig id tys rho_ty
let
(tyvars,rho) = splitForAllTy (idType real_id)
in
- tcInstType (tyvars `zipEqual` tys) rho `thenNF_Tc` \ rho_ty ->
- tcGetUnique `thenNF_Tc` \ new_uniq ->
+ tcInstType (zipEqual "newMethodAtLoc" tyvars tys) rho `thenNF_Tc` \ rho_ty ->
+ tcGetUnique `thenNF_Tc` \ new_uniq ->
let
meth_inst = Method new_uniq (RealId real_id) tys rho_ty orig loc
in
\begin{code}
instToId :: Inst s -> TcIdOcc s
instToId (Dict u clas ty orig loc)
- = TcId (mkInstId u (mkDictTy clas ty) (mkLocalName u SLIT("dict") loc))
+ = TcId (mkInstId u (mkDictTy clas ty) (mkLocalName u str False{-emph name-} loc))
+ where
+ str = SLIT("d.") _APPEND_ (getLocalName clas)
instToId (Method u id tys rho_ty orig loc)
- = TcId (mkInstId u tau_ty (mkLocalName u (getLocalName id) loc))
+ = TcId (mkInstId u tau_ty (mkLocalName u str False{-emph name-} loc))
where
(_, tau_ty) = splitRhoTy rho_ty -- NB The method Id has just the tau type
+ str = SLIT("m.") _APPEND_ (getLocalName id)
+
instToId (LitInst u list ty orig loc)
- = TcId (mkInstId u ty (mkLocalName u SLIT("lit") loc))
+ = TcId (mkInstId u ty (mkLocalName u SLIT("lit") True{-emph uniq-} loc))
\end{code}
\begin{code}
\begin{code}
tyVarsOfInst :: Inst s -> TcTyVarSet s
tyVarsOfInst (Dict _ _ ty _ _) = tyVarsOfType ty
-tyVarsOfInst (Method _ _ tys rho _ _) = tyVarsOfTypes tys
+tyVarsOfInst (Method _ id tys rho _ _) = tyVarsOfTypes tys `unionTyVarSets` tcIdTyVars id
+ -- The id might not be a RealId; in the case of
+ -- locally-overloaded class methods, for example
tyVarsOfInst (LitInst _ _ ty _ _) = tyVarsOfType ty
\end{code}
\begin{code}
instBindingRequired :: Inst s -> Bool
-instBindingRequired inst
- = case getInstOrigin inst of
- CCallOrigin _ _ -> False -- No binding required
- LitLitOrigin _ -> False
- OccurrenceOfCon _ -> False
- other -> True
+instBindingRequired (Dict _ clas _ _ _) = not (isNoDictClass clas)
+instBindingRequired other = True
instCanBeGeneralised :: Inst s -> Bool
-instCanBeGeneralised inst
- = case getInstOrigin inst of
- CCallOrigin _ _ -> False -- Can't be generalised
- LitLitOrigin _ -> False -- Can't be generalised
- other -> True
+instCanBeGeneralised (Dict _ clas _ _ _) = not (isCcallishClass clas)
+instCanBeGeneralised other = True
\end{code}
\begin{code}
instance Outputable (Inst s) where
- ppr sty (LitInst uniq lit ty orig loc)
- = ppHang (ppSep [case lit of
- OverloadedIntegral i -> ppInteger i
- OverloadedFractional f -> ppRational f,
- ppStr "at",
- ppr sty ty,
- show_uniq sty uniq
- ])
- 4 (show_origin sty orig)
-
- ppr sty (Dict uniq clas ty orig loc)
- = ppHang (ppSep [ppr sty clas,
- ppStr "at",
- ppr sty ty,
- show_uniq sty uniq
- ])
- 4 (show_origin sty orig)
-
- ppr sty (Method uniq id tys rho orig loc)
- = ppHang (ppSep [ppr sty id,
- ppStr "at",
- ppr sty tys,
- show_uniq sty uniq
- ])
- 4 (show_origin sty orig)
-
-show_uniq PprDebug uniq = ppr PprDebug uniq
-show_uniq sty uniq = ppNil
-
-show_origin sty orig = ppBesides [ppLparen, pprOrigin sty orig, ppRparen]
+ ppr sty inst = ppr_inst sty ppNil (\ o l -> ppNil) inst
+
+pprInst sty hdr inst = ppr_inst sty hdr (\ o l -> pprOrigin hdr o l sty) inst
+
+ppr_inst sty hdr ppr_orig (LitInst u lit ty orig loc)
+ = ppHang (ppr_orig orig loc)
+ 4 (ppCat [case lit of
+ OverloadedIntegral i -> ppInteger i
+ OverloadedFractional f -> ppRational f,
+ ppStr "at",
+ ppr sty ty,
+ show_uniq sty u])
+
+ppr_inst sty hdr ppr_orig (Dict u clas ty orig loc)
+ = ppHang (ppr_orig orig loc)
+ 4 (ppCat [ppr sty clas, pprParendGenType sty ty, show_uniq sty u])
+
+ppr_inst sty hdr ppr_orig (Method u id tys rho orig loc)
+ = ppHang (ppr_orig orig loc)
+ 4 (ppCat [ppr sty id, ppStr "at", interppSP sty tys, show_uniq sty u])
+
+show_uniq PprDebug u = ppr PprDebug u
+show_uniq sty u = ppNil
\end{code}
Printing in error messages
lookupInst dict@(Dict _ clas ty orig loc)
= case lookupMEnv matchTy (get_inst_env clas orig) ty of
- Nothing -> failTc (noInstanceErr dict)
+ Nothing -> tcAddSrcLoc loc $
+ tcAddErrCtxt (pprOrigin ""{-hdr-} orig loc) $
+ failTc (noInstanceErr dict)
Just (dfun_id, tenv)
-> let
= -- Alas, it is overloaded and a big literal!
tcLookupGlobalValueByKey fromIntegerClassOpKey `thenNF_Tc` \ from_integer ->
newMethodAtLoc orig loc from_integer [ty] `thenNF_Tc` \ (method_inst, method_id) ->
- returnTc ([method_inst], (instToId inst, HsApp (HsVar method_id) (HsLitOut (HsInt i) ty)))
+ returnTc ([method_inst], (instToId inst, HsApp (HsVar method_id) (HsLitOut (HsInt i) integerTy)))
where
intprim_lit = HsLitOut (HsIntPrim i) intPrimTy
int_lit = HsApp (HsVar (RealId intDataCon)) intprim_lit
lookupInst inst@(LitInst u (OverloadedFractional f) ty orig loc)
= tcLookupGlobalValueByKey fromRationalClassOpKey `thenNF_Tc` \ from_rational ->
+
+ -- The type Rational isn't wired in so we have to conjure it up
+ tcLookupTyConByKey rationalTyConKey `thenNF_Tc` \ rational_tycon ->
+ let
+ rational_ty = mkSynTy rational_tycon []
+ rational_lit = HsLitOut (HsFrac f) rational_ty
+ in
newMethodAtLoc orig loc from_rational [ty] `thenNF_Tc` \ (method_inst, method_id) ->
- returnTc ([method_inst], (instToId inst, HsApp (HsVar method_id) (HsLitOut (HsFrac f) ty)))
+ returnTc ([method_inst], (instToId inst, HsApp (HsVar method_id) rational_lit))
\end{code}
There is a second, simpler interface, when you want an instance of a
ambiguous dictionaries.
\begin{code}
-lookupClassInstAtSimpleType :: Class -> Type -> Maybe Id
-
-lookupClassInstAtSimpleType clas ty
- = case (lookupMEnv matchTy (classInstEnv clas) ty) of
- Nothing -> Nothing
- Just (dfun,_) -> ASSERT( null tyvars && null theta )
- Just dfun
- where
- (tyvars, theta, _) = splitSigmaTy (idType dfun)
+lookupSimpleInst :: ClassInstEnv
+ -> Class
+ -> Type -- Look up (c,t)
+ -> TcM s [(Class,Type)] -- Here are the needed (c,t)s
+
+lookupSimpleInst class_inst_env clas ty
+ = case (lookupMEnv matchTy class_inst_env ty) of
+ Nothing -> failTc (noSimpleInst clas ty)
+ Just (dfun,tenv) -> returnTc [(c,instantiateTy tenv t) | (c,t) <- theta]
+ where
+ (_, theta, _) = splitSigmaTy (idType dfun)
+
+noSimpleInst clas ty sty
+ = ppSep [ppStr "No instance for class", ppQuote (ppr sty clas),
+ ppStr "at type", ppQuote (ppr sty ty)]
\end{code}
| ClassDeclOrigin -- Manufactured during a class decl
- | DerivingOrigin InstanceMapper
- Class
- TyCon
+-- NO MORE!
+-- | DerivingOrigin InstanceMapper
+-- Class
+-- TyCon
-- During "deriving" operations we have an ever changing
-- mapping of classes to instances, so we record it inside the
-- origin information. This is a bit of a hack, but it works
-- fine. (Patrick is to blame [WDP].)
- | DefaultDeclOrigin -- Related to a `default' declaration
+-- | DefaultDeclOrigin -- Related to a `default' declaration
| ValSpecOrigin Name -- in a SPECIALIZE pragma for a value
-- find a mapping from classes to envts inside the dict origin.
get_inst_env :: Class -> InstOrigin s -> ClassInstEnv
-get_inst_env clas (DerivingOrigin inst_mapper _ _)
- = fst (inst_mapper clas)
+-- get_inst_env clas (DerivingOrigin inst_mapper _ _)
+-- = fst (inst_mapper clas)
get_inst_env clas (InstanceSpecOrigin inst_mapper _ _)
= fst (inst_mapper clas)
get_inst_env clas other_orig = classInstEnv clas
-pprOrigin :: PprStyle -> InstOrigin s -> Pretty
+pprOrigin :: String -> InstOrigin s -> SrcLoc -> Error
-pprOrigin sty (OccurrenceOf id)
- = ppBesides [ppPStr SLIT("at a use of an overloaded identifier: `"),
+pprOrigin hdr orig locn
+ = addErrLoc locn hdr $ \ sty ->
+ case orig of
+ OccurrenceOf id ->
+ ppBesides [ppPStr SLIT("at a use of an overloaded identifier: `"),
ppr sty id, ppChar '\'']
-pprOrigin sty (OccurrenceOfCon id)
- = ppBesides [ppPStr SLIT("at a use of an overloaded constructor: `"),
+ OccurrenceOfCon id ->
+ ppBesides [ppPStr SLIT("at a use of an overloaded constructor: `"),
ppr sty id, ppChar '\'']
-pprOrigin sty (InstanceDeclOrigin)
- = ppStr "in an instance declaration"
-pprOrigin sty (LiteralOrigin lit)
- = ppCat [ppStr "at an overloaded literal:", ppr sty lit]
-pprOrigin sty (ArithSeqOrigin seq)
- = ppCat [ppStr "at an arithmetic sequence:", ppr sty seq]
-pprOrigin sty (SignatureOrigin)
- = ppStr "in a type signature"
-pprOrigin sty (DoOrigin)
- = ppStr "in a do statement"
-pprOrigin sty (ClassDeclOrigin)
- = ppStr "in a class declaration"
-pprOrigin sty (DerivingOrigin _ clas tycon)
- = ppBesides [ppStr "in a `deriving' clause; class `",
- ppr sty clas,
- ppStr "'; offending type `",
- ppr sty tycon,
- ppStr "'"]
-pprOrigin sty (InstanceSpecOrigin _ clas ty)
- = ppBesides [ppStr "in a SPECIALIZE instance pragma; class \"",
+ InstanceDeclOrigin ->
+ ppStr "in an instance declaration"
+ LiteralOrigin lit ->
+ ppCat [ppStr "at an overloaded literal:", ppr sty lit]
+ ArithSeqOrigin seq ->
+ ppCat [ppStr "at an arithmetic sequence:", ppr sty seq]
+ SignatureOrigin ->
+ ppStr "in a type signature"
+ DoOrigin ->
+ ppStr "in a do statement"
+ ClassDeclOrigin ->
+ ppStr "in a class declaration"
+ InstanceSpecOrigin _ clas ty ->
+ ppBesides [ppStr "in a SPECIALIZE instance pragma; class \"",
ppr sty clas, ppStr "\" type: ", ppr sty ty]
-pprOrigin sty (DefaultDeclOrigin)
- = ppStr "in a `default' declaration"
-pprOrigin sty (ValSpecOrigin name)
- = ppBesides [ppStr "in a SPECIALIZE user-pragma for `",
+ ValSpecOrigin name ->
+ ppBesides [ppStr "in a SPECIALIZE user-pragma for `",
ppr sty name, ppStr "'"]
-pprOrigin sty (CCallOrigin clabel Nothing{-ccall result-})
- = ppBesides [ppStr "in the result of the _ccall_ to `",
+ CCallOrigin clabel Nothing{-ccall result-} ->
+ ppBesides [ppStr "in the result of the _ccall_ to `",
ppStr clabel, ppStr "'"]
-pprOrigin sty (CCallOrigin clabel (Just arg_expr))
- = ppBesides [ppStr "in an argument in the _ccall_ to `",
+ CCallOrigin clabel (Just arg_expr) ->
+ ppBesides [ppStr "in an argument in the _ccall_ to `",
ppStr clabel, ppStr "', namely: ", ppr sty arg_expr]
-pprOrigin sty (LitLitOrigin s)
- = ppBesides [ppStr "in this ``literal-literal'': ", ppStr s]
-pprOrigin sty UnknownOrigin
- = ppStr "in... oops -- I don't know where the overloading came from!"
+ LitLitOrigin s ->
+ ppBesides [ppStr "in this ``literal-literal'': ", ppStr s]
+ UnknownOrigin ->
+ ppStr "in... oops -- I don't know where the overloading came from!"
\end{code}
-
-
-
projects / ghc-hetmet.git / blobdiff