Inst(..), -- Visible only to TcSimplify
InstOrigin(..), OverloadedLit(..),
- LIE(..), emptyLIE, unitLIE, plusLIE, consLIE, zonkLIE, plusLIEs,
+ SYN_IE(LIE), emptyLIE, unitLIE, plusLIE, consLIE, zonkLIE, plusLIEs,
+ pprLIE, pprLIEInFull,
- InstanceMapper(..),
+ SYN_IE(InstanceMapper),
newDicts, newDictsAtLoc, newMethod, newMethodWithGivenTy, newOverloadedLit,
- instType, tyVarsOfInst, lookupInst, lookupSimpleInst,
+ tyVarsOfInst, lookupInst, lookupSimpleInst,
isDict, isTyVarDict,
) where
IMP_Ubiq()
-
-import HsSyn ( HsLit(..), HsExpr(..), HsBinds,
- InPat, OutPat, Stmt, Qualifier, Match,
- ArithSeqInfo, PolyType, Fake )
-import RnHsSyn ( RenamedArithSeqInfo(..), RenamedHsExpr(..) )
-import TcHsSyn ( TcIdOcc(..), TcExpr(..), TcIdBndr(..),
+IMPORT_1_3(Ratio(Rational))
+
+import HsSyn ( HsLit(..), HsExpr(..), HsBinds, Fixity, MonoBinds(..),
+ InPat, OutPat, Stmt, DoOrListComp, Match, GRHSsAndBinds,
+ ArithSeqInfo, HsType, Fake )
+import RnHsSyn ( SYN_IE(RenamedArithSeqInfo), SYN_IE(RenamedHsExpr) )
+import TcHsSyn ( SYN_IE(TcExpr),
+ SYN_IE(TcDictBinds), SYN_IE(TcMonoBinds),
mkHsTyApp, mkHsDictApp, tcIdTyVars )
-import TcMonad hiding ( rnMtoTcM )
+import TcMonad
import TcEnv ( tcLookupGlobalValueByKey, tcLookupTyConByKey )
-import TcType ( TcType(..), TcRhoType(..), TcMaybe, TcTyVarSet(..),
- tcInstType, zonkTcType )
-
-import Bag ( emptyBag, unitBag, unionBags, unionManyBags, listToBag, consBag )
-import Class ( isCcallishClass, isNoDictClass, classInstEnv,
- SYN_IE(Class), GenClass, SYN_IE(ClassInstEnv)
+import TcType ( TcIdOcc(..), SYN_IE(TcIdBndr), SYN_IE(TcThetaType), SYN_IE(TcTauType),
+ SYN_IE(TcType), SYN_IE(TcRhoType), TcMaybe, SYN_IE(TcTyVarSet),
+ tcInstType, zonkTcType, zonkTcTheta,
+ tcSplitForAllTy, tcSplitRhoTy
+ )
+import Bag ( emptyBag, unitBag, unionBags, unionManyBags, bagToList,
+ listToBag, consBag, Bag )
+import Class ( classInstEnv,
+ SYN_IE(Class), GenClass, SYN_IE(ClassInstEnv)
)
import ErrUtils ( addErrLoc, SYN_IE(Error) )
-import Id ( GenId, idType, mkInstId )
+import Id ( GenId, idType, mkUserLocal, mkSysLocal, SYN_IE(Id) )
+import PrelInfo ( isCcallishClass, isNoDictClass )
import MatchEnv ( lookupMEnv, insertMEnv )
-import Name ( mkLocalName, getLocalName, Name )
+import Name ( OccName(..), Name, mkLocalName,
+ mkSysLocalName, occNameString, getOccName )
import Outputable
-import PprType ( GenClass, TyCon, GenType, GenTyVar )
-import PprStyle ( PprStyle(..) )
+import PprType ( GenClass, TyCon, GenType, GenTyVar, pprParendGenType )
import Pretty
-import RnHsSyn ( RnName{-instance NamedThing-} )
-import SpecEnv ( SYN_IE(SpecEnv) )
-import SrcLoc ( SrcLoc, mkUnknownSrcLoc )
+import SpecEnv ( SpecEnv )
+import SrcLoc ( SrcLoc, noSrcLoc )
import Type ( GenType, eqSimpleTy, instantiateTy,
isTyVarTy, mkDictTy, splitForAllTy, splitSigmaTy,
splitRhoTy, matchTy, tyVarsOfType, tyVarsOfTypes,
- mkSynTy
+ mkSynTy, SYN_IE(Type)
)
import TyVar ( unionTyVarSets, GenTyVar )
import TysPrim ( intPrimTy )
-import TysWiredIn ( intDataCon, integerTy )
-import Unique ( showUnique, fromRationalClassOpKey, rationalTyConKey,
+import TysWiredIn ( intDataCon, integerTy, isIntTy, isIntegerTy, inIntRange )
+import Unique ( fromRationalClassOpKey, rationalTyConKey,
fromIntClassOpKey, fromIntegerClassOpKey, Unique
)
import Util ( panic, zipEqual, zipWithEqual, assoc, assertPanic, pprTrace{-ToDo:rm-} )
+#if __GLASGOW_HASKELL__ >= 202
+import Maybes
+#endif
\end{code}
%************************************************************************
zonkLIE :: LIE s -> NF_TcM s (LIE s)
zonkLIE lie = mapBagNF_Tc zonkInst lie
+
+pprLIE :: PprStyle -> LIE s -> Doc
+pprLIE sty lie = pprQuote sty $ \ sty ->
+ braces (hsep (punctuate comma (map (pprInst sty) (bagToList lie))))
+
+
+pprLIEInFull sty insts
+ = vcat (map go (bagToList insts))
+ where
+ go inst = ppr sty inst <+> pprOrigin sty inst
\end{code}
%************************************************************************
-- should be instantiated.
-- These types must saturate the Id's foralls.
- (TcRhoType s) -- Cached: (type-of-id applied to inst_tys)
- -- If this type is (theta => tau) then the type of the Method
- -- is tau, and the method can be built by saying
- -- id inst_tys dicts
- -- where dicts are constructed from theta
+ (TcThetaType s) -- The (types of the) dictionaries to which the function
+ -- must be applied to get the method
+
+ (TcTauType s) -- The type of the method
(InstOrigin s)
SrcLoc
+ -- INVARIANT: in (Method u f tys theta tau loc)
+ -- type of (f tys dicts(from theta)) = tau
+
| LitInst
Unique
OverloadedLit
= OverloadedIntegral Integer -- The number
| OverloadedFractional Rational -- The number
-getInstOrigin (Dict u clas ty origin loc) = origin
-getInstOrigin (Method u clas ty rho origin loc) = origin
-getInstOrigin (LitInst u lit ty origin loc) = origin
+getInstOrigin (Dict u clas ty origin loc) = origin
+getInstOrigin (Method u fn tys theta tau origin loc) = origin
+getInstOrigin (LitInst u lit ty origin loc) = origin
\end{code}
Construction
-> NF_TcM s (LIE s, [TcIdOcc s])
newDicts orig theta
= tcGetSrcLoc `thenNF_Tc` \ loc ->
+ newDictsAtLoc orig loc theta `thenNF_Tc` \ (dicts, ids) ->
+ returnNF_Tc (listToBag dicts, ids)
+{-
tcGetUniques (length theta) `thenNF_Tc` \ new_uniqs ->
let
mk_dict u (clas, ty) = Dict u clas ty orig loc
dicts = zipWithEqual "newDicts" mk_dict new_uniqs theta
in
returnNF_Tc (listToBag dicts, map instToId dicts)
-
-newDictsAtLoc orig loc theta -- Local function, similar to newDicts,
- -- but with slightly different interface
- = tcGetUniques (length theta) `thenNF_Tc` \ new_uniqs ->
- let
- mk_dict u (clas, ty) = Dict u clas ty orig loc
- dicts = zipWithEqual "newDictsAtLoc" mk_dict new_uniqs theta
- in
- returnNF_Tc (dicts, map instToId dicts)
+-}
+
+-- Local function, similar to newDicts,
+-- but with slightly different interface
+newDictsAtLoc :: InstOrigin s
+ -> SrcLoc
+ -> [(Class, TcType s)]
+ -> NF_TcM s ([Inst s], [TcIdOcc s])
+newDictsAtLoc orig loc theta =
+ tcGetUniques (length theta) `thenNF_Tc` \ new_uniqs ->
+ let
+ mk_dict u (clas, ty) = Dict u clas ty orig loc
+ dicts = zipWithEqual "newDictsAtLoc" mk_dict new_uniqs theta
+ in
+ returnNF_Tc (dicts, map instToId dicts)
newMethod :: InstOrigin s
-> TcIdOcc s
(case id of
RealId id -> let (tyvars, rho) = splitForAllTy (idType id)
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 returnNF_Tc (instantiateTy (zipEqual "newMethod(2)" tyvars tys) rho)
+ tcInstType (zipEqual "newMethod" tyvars tys) rho
+
+ TcId id -> tcSplitForAllTy (idType id) `thenNF_Tc` \ (tyvars, rho) ->
+ returnNF_Tc (instantiateTy (zipEqual "newMethod(2)" tyvars tys) rho)
) `thenNF_Tc` \ rho_ty ->
+ let
+ (theta, tau) = splitRhoTy rho_ty
+ in
-- Our friend does the rest
- newMethodWithGivenTy orig id tys rho_ty
+ newMethodWithGivenTy orig id tys theta tau
-newMethodWithGivenTy orig id tys rho_ty
+newMethodWithGivenTy orig id tys theta tau
= tcGetSrcLoc `thenNF_Tc` \ loc ->
tcGetUnique `thenNF_Tc` \ new_uniq ->
let
- meth_inst = Method new_uniq id tys rho_ty orig loc
+ meth_inst = Method new_uniq id tys theta tau orig loc
in
returnNF_Tc (unitLIE meth_inst, instToId meth_inst)
-newMethodAtLoc :: InstOrigin s -> SrcLoc -> Id -> [TcType s] -> NF_TcM s (Inst s, TcIdOcc s)
+newMethodAtLoc :: InstOrigin s -> SrcLoc
+ -> Id -> [TcType s]
+ -> NF_TcM s (Inst s, TcIdOcc s)
newMethodAtLoc orig loc real_id tys -- Local function, similar to newMethod but with
-- slightly different interface
= -- Get the Id type and instantiate it at the specified types
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
+ (theta, tau) = splitRhoTy rho_ty
+ meth_inst = Method new_uniq (RealId real_id) tys theta tau orig loc
in
returnNF_Tc (meth_inst, instToId meth_inst)
newOverloadedLit :: InstOrigin s
-> OverloadedLit
-> TcType s
- -> NF_TcM s (LIE s, TcIdOcc s)
-newOverloadedLit orig lit ty
+ -> NF_TcM s (TcExpr s, LIE s)
+newOverloadedLit orig (OverloadedIntegral i) ty
+ | isIntTy ty && inIntRange i -- Short cut for Int
+ = returnNF_Tc (int_lit, emptyLIE)
+
+ | isIntegerTy ty -- Short cut for Integer
+ = returnNF_Tc (integer_lit, emptyLIE)
+
+ where
+ intprim_lit = HsLitOut (HsIntPrim i) intPrimTy
+ integer_lit = HsLitOut (HsInt i) integerTy
+ int_lit = HsApp (HsVar (RealId intDataCon)) intprim_lit
+
+newOverloadedLit orig lit ty -- The general case
= tcGetSrcLoc `thenNF_Tc` \ loc ->
tcGetUnique `thenNF_Tc` \ new_uniq ->
let
lit_inst = LitInst new_uniq lit ty orig loc
in
- returnNF_Tc (unitLIE lit_inst, instToId lit_inst)
+ returnNF_Tc (HsVar (instToId lit_inst), unitLIE lit_inst)
\end{code}
\begin{code}
instToId :: Inst s -> TcIdOcc s
instToId (Dict u clas ty orig 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 str False{-emph name-} loc))
+ = TcId (mkUserLocal occ u (mkDictTy clas ty) loc)
where
- (_, tau_ty) = splitRhoTy rho_ty -- NB The method Id has just the tau type
- str = SLIT("m.") _APPEND_ (getLocalName id)
+ occ = VarOcc (SLIT("d.") _APPEND_ (occNameString (getOccName clas)))
+instToId (Method u id tys theta tau orig loc)
+ = TcId (mkUserLocal (getOccName id) u tau loc)
+
instToId (LitInst u list ty orig loc)
- = TcId (mkInstId u ty (mkLocalName u SLIT("lit") True{-emph uniq-} loc))
-\end{code}
-
-\begin{code}
-instType :: Inst s -> TcType s
-instType (Dict _ clas ty _ _) = mkDictTy clas ty
-instType (LitInst _ _ ty _ _) = ty
-instType (Method _ id tys ty _ _) = ty
+ = TcId (mkSysLocal SLIT("lit") u ty loc)
\end{code}
= zonkTcType ty `thenNF_Tc` \ new_ty ->
returnNF_Tc (Dict u clas new_ty orig loc)
-zonkInst (Method u id tys rho orig loc) -- Doesn't zonk the id!
+zonkInst (Method u id tys theta tau orig loc) -- Doesn't zonk the id!
= mapNF_Tc zonkTcType tys `thenNF_Tc` \ new_tys ->
- zonkTcType rho `thenNF_Tc` \ new_rho ->
- returnNF_Tc (Method u id new_tys new_rho orig loc)
+ zonkTcTheta theta `thenNF_Tc` \ new_theta ->
+ zonkTcType tau `thenNF_Tc` \ new_tau ->
+ returnNF_Tc (Method u id new_tys new_theta new_tau orig loc)
zonkInst (LitInst u lit ty orig loc)
= zonkTcType ty `thenNF_Tc` \ new_ty ->
\begin{code}
tyVarsOfInst :: Inst s -> TcTyVarSet s
-tyVarsOfInst (Dict _ _ ty _ _) = tyVarsOfType ty
-tyVarsOfInst (Method _ id tys rho _ _) = tyVarsOfTypes tys `unionTyVarSets` tcIdTyVars id
+tyVarsOfInst (Dict _ _ ty _ _) = tyVarsOfType ty
+tyVarsOfInst (Method _ id tys _ _ _ _) = 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
matchesInst (Dict _ clas1 ty1 _ _) (Dict _ clas2 ty2 _ _)
= clas1 == clas2 && ty1 `eqSimpleTy` ty2
-matchesInst (Method _ id1 tys1 _ _ _) (Method _ id2 tys2 _ _ _)
+matchesInst (Method _ id1 tys1 _ _ _ _) (Method _ id2 tys2 _ _ _ _)
= id1 == id2
&& and (zipWith eqSimpleTy tys1 tys2)
&& length tys1 == length tys2
\begin{code}
instance Outputable (Inst s) where
- 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 sty inst = pprQuote sty (\ sty -> pprInst 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])
+pprInst sty (LitInst u lit ty orig loc)
+ = hsep [case lit of
+ OverloadedIntegral i -> integer i
+ OverloadedFractional f -> rational f,
+ ptext SLIT("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, ppr sty ty, show_uniq sty u])
+pprInst sty (Dict u clas ty orig loc)
+ = hsep [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])
+pprInst sty (Method u id tys _ _ orig loc)
+ = hsep [ppr sty id, ptext SLIT("at"),
+ interppSP sty tys,
+ show_uniq sty u]
show_uniq PprDebug u = ppr PprDebug u
-show_uniq sty u = ppNil
+show_uniq sty u = empty
\end{code}
-Printing in error messages
+Printing in error messages. These two must look the same.
\begin{code}
-noInstanceErr inst sty = ppHang (ppPStr SLIT("No instance for:")) 4 (ppr sty inst)
+noInstanceErr inst sty = ptext SLIT("No instance for:") <+> ppr sty inst
+
+noSimpleInst clas ty sty
+ = ptext SLIT("No instance for:") <+>
+ (pprQuote sty (\ sty -> ppr sty clas <+> pprParendGenType sty ty))
\end{code}
%************************************************************************
%************************************************************************
\begin{code}
-type InstanceMapper = Class -> (ClassInstEnv, ClassOp -> SpecEnv)
+type InstanceMapper = Class -> ClassInstEnv
\end{code}
A @ClassInstEnv@ lives inside a class, and identifies all the instances
\begin{code}
lookupInst :: Inst s
-> TcM s ([Inst s],
- (TcIdOcc s, TcExpr s)) -- The new binding
+ TcDictBinds s) -- The new binding
-- Dictionaries
lookupInst dict@(Dict _ clas ty orig loc)
= case lookupMEnv matchTy (get_inst_env clas orig) ty of
Nothing -> tcAddSrcLoc loc $
- tcAddErrCtxt (pprOrigin ""{-hdr-} orig loc) $
+ tcAddErrCtxt (\sty -> pprOrigin sty dict) $
failTc (noInstanceErr dict)
Just (dfun_id, tenv)
let
rhs = mkHsDictApp (mkHsTyApp (HsVar (RealId dfun_id)) ty_args) dict_ids
in
- returnTc (dicts, (instToId dict, rhs))
+ returnTc (dicts, VarMonoBind (instToId dict) rhs)
-- Methods
-lookupInst inst@(Method _ id tys rho orig loc)
+lookupInst inst@(Method _ id tys theta _ orig loc)
= newDictsAtLoc orig loc theta `thenNF_Tc` \ (dicts, dict_ids) ->
- returnTc (dicts, (instToId inst, mkHsDictApp (mkHsTyApp (HsVar id) tys) dict_ids))
- where
- (theta,_) = splitRhoTy rho
+ returnTc (dicts, VarMonoBind (instToId inst) (mkHsDictApp (mkHsTyApp (HsVar id) tys) dict_ids))
-- Literals
lookupInst inst@(LitInst u (OverloadedIntegral i) ty orig loc)
- | i >= toInteger minInt && i <= toInteger maxInt
- = -- It's overloaded but small enough to fit into an Int
- tcLookupGlobalValueByKey fromIntClassOpKey `thenNF_Tc` \ from_int ->
- newMethodAtLoc orig loc from_int [ty] `thenNF_Tc` \ (method_inst, method_id) ->
- returnTc ([method_inst], (instToId inst, HsApp (HsVar method_id) int_lit))
-
- | otherwise
- = -- Alas, it is overloaded and a big literal!
- tcLookupGlobalValueByKey fromIntegerClassOpKey `thenNF_Tc` \ from_integer ->
+ | isIntTy ty && in_int_range -- Short cut for Int
+ = returnTc ([], VarMonoBind inst_id int_lit)
+
+ | isIntegerTy ty -- Short cut for Integer
+ = returnTc ([], VarMonoBind inst_id integer_lit)
+
+ | in_int_range -- It's overloaded but small enough to fit into an Int
+ = tcLookupGlobalValueByKey fromIntClassOpKey `thenNF_Tc` \ from_int ->
+ newMethodAtLoc orig loc from_int [ty] `thenNF_Tc` \ (method_inst, method_id) ->
+ returnTc ([method_inst], VarMonoBind inst_id (HsApp (HsVar method_id) int_lit))
+
+ | otherwise -- 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) integerTy)))
+ returnTc ([method_inst], VarMonoBind inst_id (HsApp (HsVar method_id) integer_lit))
where
+ in_int_range = inIntRange i
intprim_lit = HsLitOut (HsIntPrim i) intPrimTy
+ integer_lit = HsLitOut (HsInt i) integerTy
int_lit = HsApp (HsVar (RealId intDataCon)) intprim_lit
+ inst_id = instToId inst
lookupInst inst@(LitInst u (OverloadedFractional f) ty orig loc)
= tcLookupGlobalValueByKey fromRationalClassOpKey `thenNF_Tc` \ from_rational ->
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) rational_lit))
+ returnTc ([method_inst], VarMonoBind (instToId inst) (HsApp (HsVar method_id) rational_lit))
\end{code}
There is a second, simpler interface, when you want an instance of a
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}
| ArithSeqOrigin RenamedArithSeqInfo -- [x..], [x..y] etc
| SignatureOrigin -- A dict created from a type signature
+ | Rank2Origin -- A dict created when typechecking the argument
+ -- of a rank-2 typed function
| DoOrigin -- The monad for a do expression
-- get_inst_env clas (DerivingOrigin inst_mapper _ _)
-- = fst (inst_mapper clas)
get_inst_env clas (InstanceSpecOrigin inst_mapper _ _)
- = fst (inst_mapper clas)
+ = inst_mapper clas
get_inst_env clas other_orig = classInstEnv clas
-pprOrigin :: String -> InstOrigin s -> SrcLoc -> Error
-
-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 '\'']
- OccurrenceOfCon id ->
- ppBesides [ppPStr SLIT("at a use of an overloaded constructor: `"),
- ppr sty id, ppChar '\'']
- 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]
- ValSpecOrigin name ->
- ppBesides [ppStr "in a SPECIALIZE user-pragma for `",
- ppr sty name, ppStr "'"]
- CCallOrigin clabel Nothing{-ccall result-} ->
- ppBesides [ppStr "in the result of the _ccall_ to `",
- ppStr clabel, ppStr "'"]
- CCallOrigin clabel (Just arg_expr) ->
- ppBesides [ppStr "in an argument in the _ccall_ to `",
- ppStr clabel, ppStr "', namely: ", ppr sty arg_expr]
- LitLitOrigin s ->
- ppBesides [ppStr "in this ``literal-literal'': ", ppStr s]
- UnknownOrigin ->
- ppStr "in... oops -- I don't know where the overloading came from!"
+pprOrigin :: PprStyle -> Inst s -> Doc
+pprOrigin sty inst
+ = hsep [text "arising from", pp_orig orig, text "at", ppr sty locn]
+ where
+ (orig, locn) = case inst of
+ Dict _ _ _ orig loc -> (orig,loc)
+ Method _ _ _ _ _ orig loc -> (orig,loc)
+ LitInst _ _ _ orig loc -> (orig,loc)
+
+ pp_orig (OccurrenceOf id)
+ = hsep [ptext SLIT("use of"), ppr sty id]
+ pp_orig (OccurrenceOfCon id)
+ = hsep [ptext SLIT("use of"), ppr sty id]
+ pp_orig (LiteralOrigin lit)
+ = hsep [ptext SLIT("the literal"), ppr sty lit]
+ pp_orig (InstanceDeclOrigin)
+ = ptext SLIT("an instance declaration")
+ pp_orig (ArithSeqOrigin seq)
+ = hsep [ptext SLIT("the arithmetic sequence:"), ppr sty seq]
+ pp_orig (SignatureOrigin)
+ = ptext SLIT("a type signature")
+ pp_orig (Rank2Origin)
+ = ptext SLIT("a function with an overloaded argument type")
+ pp_orig (DoOrigin)
+ = ptext SLIT("a do statement")
+ pp_orig (ClassDeclOrigin)
+ = ptext SLIT("a class declaration")
+ pp_orig (InstanceSpecOrigin _ clas ty)
+ = hsep [text "a SPECIALIZE instance pragma; class",
+ ppr sty clas, text "type:", ppr sty ty]
+ pp_orig (ValSpecOrigin name)
+ = hsep [ptext SLIT("a SPECIALIZE user-pragma for"), ppr sty name]
+ pp_orig (CCallOrigin clabel Nothing{-ccall result-})
+ = hsep [ptext SLIT("the result of the _ccall_ to"), text clabel]
+ pp_orig (CCallOrigin clabel (Just arg_expr))
+ = hsep [ptext SLIT("an argument in the _ccall_ to"), text clabel <> comma, text "namely", ppr sty arg_expr]
+ pp_orig (LitLitOrigin s)
+ = hsep [ptext SLIT("the ``literal-literal''"), text s]
+ pp_orig (UnknownOrigin)
+ = ptext SLIT("...oops -- I don't know where the overloading came from!")
\end{code}
projects / ghc-hetmet.git / blobdiff