zonkInst, instToId,
matchesInst,
- instBindingRequired, instCanBeGeneralised
-
+ instBindingRequired, instCanBeGeneralised,
+
+ pprInst
) where
-import Ubiq
+IMP_Ubiq()
import HsSyn ( HsLit(..), HsExpr(..), HsBinds,
InPat, OutPat, Stmt, Qual, Match,
ArithSeqInfo, PolyType, Fake )
import RnHsSyn ( RenamedArithSeqInfo(..), RenamedHsExpr(..) )
import TcHsSyn ( TcIdOcc(..), TcExpr(..), TcIdBndr(..),
- mkHsTyApp, mkHsDictApp )
+ mkHsTyApp, mkHsDictApp, tcIdTyVars )
import TcMonad hiding ( rnMtoTcM )
-import TcEnv ( tcLookupGlobalValueByKey )
+import TcEnv ( tcLookupGlobalValueByKey, tcLookupTyConByKey )
import TcType ( TcType(..), TcRhoType(..), TcMaybe, TcTyVarSet(..),
tcInstType, zonkTcType )
import Bag ( emptyBag, unitBag, unionBags, unionManyBags, listToBag, consBag )
-import Class ( Class(..), GenClass, ClassInstEnv(..), classInstEnv )
+import Class ( isCcallishClass, isNoDictClass, classInstEnv,
+ Class(..), GenClass, ClassInstEnv(..)
+ )
+import ErrUtils ( addErrLoc, Error(..) )
import Id ( GenId, idType, mkInstId )
import MatchEnv ( lookupMEnv, insertMEnv )
import Name ( mkLocalName, getLocalName, Name )
import SrcLoc ( SrcLoc, mkUnknownSrcLoc )
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}
%************************************************************************
= -- Get the Id type and instantiate it at the specified types
(case id of
RealId id -> let (tyvars, rho) = splitForAllTy (idType id)
- in tcInstType (zipEqual "newMethod" tyvars 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 returnNF_Tc (instantiateTy (zipEqual "newMethod(2)" tyvars tys) rho)
) `thenNF_Tc` \ rho_ty ->
\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)
- = ppSep [case lit of
- OverloadedIntegral i -> ppInteger i
- OverloadedFractional f -> ppRational f,
- ppStr "at",
- ppr sty ty,
- show_uniq sty uniq
- ]
-
- ppr sty (Dict uniq clas ty orig loc)
- = ppSep [ppr sty clas,
- ppStr "at",
- ppr sty ty,
- show_uniq sty uniq
- ]
-
- ppr sty (Method uniq id tys rho orig loc)
- = ppSep [ppr sty id,
- ppStr "at",
- ppr sty tys,
- show_uniq sty uniq
- ]
-
-show_uniq PprDebug uniq = ppr PprDebug uniq
-show_uniq sty uniq = ppNil
+ 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, ppr 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 -> tcAddSrcLoc loc $
- tcAddErrCtxt (pprOrigin orig) $
+ tcAddErrCtxt (pprOrigin ""{-hdr-} orig loc) $
failTc (noInstanceErr dict)
Just (dfun_id, tenv)
= -- 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
get_inst_env clas other_orig = classInstEnv clas
-pprOrigin :: InstOrigin s -> PprStyle -> Pretty
+pprOrigin :: String -> InstOrigin s -> SrcLoc -> Error
-pprOrigin (OccurrenceOf id) sty
- = 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 (OccurrenceOfCon id) sty
- = 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 (InstanceDeclOrigin) sty
- = ppStr "in an instance declaration"
-pprOrigin (LiteralOrigin lit) sty
- = ppCat [ppStr "at an overloaded literal:", ppr sty lit]
-pprOrigin (ArithSeqOrigin seq) sty
- = ppCat [ppStr "at an arithmetic sequence:", ppr sty seq]
-pprOrigin (SignatureOrigin) sty
- = ppStr "in a type signature"
-pprOrigin (DoOrigin) sty
- = ppStr "in a do statement"
-pprOrigin (ClassDeclOrigin) sty
- = ppStr "in a class declaration"
--- pprOrigin (DerivingOrigin _ clas tycon) sty
--- = ppBesides [ppStr "in a `deriving' clause; class `",
--- ppr sty clas,
--- ppStr "'; offending type `",
--- ppr sty tycon,
--- ppStr "'"]
-pprOrigin (InstanceSpecOrigin _ clas ty) sty
- = 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 (DefaultDeclOrigin) sty
--- = ppStr "in a `default' declaration"
-pprOrigin (ValSpecOrigin name) sty
- = ppBesides [ppStr "in a SPECIALIZE user-pragma for `",
+ ValSpecOrigin name ->
+ ppBesides [ppStr "in a SPECIALIZE user-pragma for `",
ppr sty name, ppStr "'"]
-pprOrigin (CCallOrigin clabel Nothing{-ccall result-}) sty
- = 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 (CCallOrigin clabel (Just arg_expr)) sty
- = 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 (LitLitOrigin s) sty
- = ppBesides [ppStr "in this ``literal-literal'': ", ppStr s]
-pprOrigin UnknownOrigin sty
- = 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