X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcInteract.lhs;h=3833534f1e44cbd38f73eb7a52a8bfb7fe75a29f;hp=46eece84e8903a1cc5952a00a5ccddedf6d45dbf;hb=febf1ced754a3996ac1a5877dcded87828560d1c;hpb=9591547fbbdf12728884e125f8ba08b0e6e69f82 diff --git a/compiler/typecheck/TcInteract.lhs b/compiler/typecheck/TcInteract.lhs index 46eece8..3833534 100644 --- a/compiler/typecheck/TcInteract.lhs +++ b/compiler/typecheck/TcInteract.lhs @@ -413,18 +413,12 @@ dischargeFromCCans cans ev fl discharge_ct :: CanonicalCt -> TcS Bool -> TcS Bool discharge_ct ct _rest - | evVarPred (cc_id ct) `tcEqPred` the_pred + | evVarPred (cc_id ct) `eqPred` the_pred , cc_flavor ct `canSolve` fl - -- DV: No special care should be taken for Given/Solveds, we will - -- never encounter a Given entering the constraint bag after a Given/Solved - = do { when (isWanted fl) $ set_ev_bind ev (cc_id ct) + = do { when (isWanted fl) $ setEvBind ev (evVarTerm (cc_id ct)) -- Deriveds need no evidence -- For Givens, we already have evidence, and we don't need it twice ; return True } - where - set_ev_bind x y - | EqPred {} <- evVarPred y = setEvBind x (EvCoercion (mkCoVarCoercion y)) - | otherwise = setEvBind x (EvId y) discharge_ct _ct rest = rest \end{code} @@ -732,9 +726,10 @@ solveWithIdentity cv wd tv xi ] ; setWantedTyBind tv xi - ; cv_given <- newGivenCoVar (mkTyVarTy tv) xi xi + ; let refl_xi = mkReflCo xi + ; cv_given <- newGivenCoVar (mkTyVarTy tv) xi refl_xi - ; when (isWanted wd) (setCoBind cv xi) + ; when (isWanted wd) (setCoBind cv refl_xi) -- We don't want to do this for Derived, that's why we use 'when (isWanted wd)' ; return $ SPSolved (CTyEqCan { cc_id = cv_given , cc_flavor = mkSolvedFlavor wd UnkSkol @@ -934,7 +929,7 @@ doInteractWithInert :: CanonicalCt -> CanonicalCt -> TcS InteractResult doInteractWithInert inertItem@(CDictCan { cc_id = d1, cc_flavor = fl1, cc_class = cls1, cc_tyargs = tys1 }) workItem@(CDictCan { cc_id = d2, cc_flavor = fl2, cc_class = cls2, cc_tyargs = tys2 }) - | cls1 == cls2 && (and $ zipWith tcEqType tys1 tys2) + | cls1 == cls2 && eqTypes tys1 tys2 = solveOneFromTheOther "Cls/Cls" (EvId d1,fl1) workItem | cls1 == cls2 && (not (isGivenOrSolved fl1 && isGivenOrSolved fl2)) @@ -952,7 +947,7 @@ doInteractWithInert ; case m of Nothing -> noInteraction workItem Just (rewritten_tys2, cos2, fd_work) - | tcEqTypes tys1 rewritten_tys2 + | eqTypes tys1 rewritten_tys2 -> -- Solve him on the spot in this case case fl2 of Given {} -> pprPanic "Unexpected given" (ppr inertItem $$ ppr workItem) @@ -997,7 +992,7 @@ doInteractWithInert workListFromNonEq workItem' `unionWorkList` fd_work } where - dict_co = mkTyConCoercion (classTyCon cls1) cos2 + dict_co = mkTyConAppCo (classTyCon cls1) cos2 } -- Class constraint and given equality: use the equality to rewrite @@ -1049,7 +1044,7 @@ doInteractWithInert (CIPCan { cc_id = id1, cc_flavor = ifl, cc_ip_nm = nm1, cc_i -- we must *override* the outer one with the inner one mkIRContinue "IP/IP override" workItem DropInert emptyWorkList - | nm1 == nm2 && ty1 `tcEqType` ty2 + | nm1 == nm2 && ty1 `eqType` ty2 = solveOneFromTheOther "IP/IP" (EvId id1,ifl) workItem | nm1 == nm2 @@ -1062,7 +1057,7 @@ doInteractWithInert (CIPCan { cc_id = id1, cc_flavor = ifl, cc_ip_nm = nm1, cc_i Derived {} -> pprPanic "Unexpected derived IP" (ppr workItem) Wanted {} -> do { setIPBind (cc_id workItem) $ - EvCast id1 (mkSymCoercion (mkCoVarCoercion co_var)) + EvCast id1 (mkSymCo (mkCoVarCo co_var)) ; mkIRStopK "IP/IP interaction (solved)" cans } } @@ -1102,31 +1097,31 @@ doInteractWithInert (CFunEqCan { cc_id = cv1, cc_flavor = fl1, cc_fun = tc1 , cc_tyargs = args1, cc_rhs = xi1 }) workItem@(CFunEqCan { cc_id = cv2, cc_flavor = fl2, cc_fun = tc2 , cc_tyargs = args2, cc_rhs = xi2 }) - | tc1 == tc2 && and (zipWith tcEqType args1 args2) + | tc1 == tc2 && and (zipWith eqType args1 args2) , Just GivenSolved <- isGiven_maybe fl1 = mkIRContinue "Funeq/Funeq" workItem DropInert emptyWorkList - | tc1 == tc2 && and (zipWith tcEqType args1 args2) + | tc1 == tc2 && and (zipWith eqType args1 args2) , Just GivenSolved <- isGiven_maybe fl2 = mkIRStopK "Funeq/Funeq" emptyWorkList | fl1 `canSolve` fl2 && lhss_match - = do { cans <- rewriteEqLHS LeftComesFromInert (mkCoVarCoercion cv1,xi1) (cv2,fl2,xi2) + = do { cans <- rewriteEqLHS LeftComesFromInert (mkCoVarCo cv1,xi1) (cv2,fl2,xi2) ; mkIRStopK "FunEq/FunEq" cans } | fl2 `canSolve` fl1 && lhss_match - = do { cans <- rewriteEqLHS RightComesFromInert (mkCoVarCoercion cv2,xi2) (cv1,fl1,xi1) + = do { cans <- rewriteEqLHS RightComesFromInert (mkCoVarCo cv2,xi2) (cv1,fl1,xi1) ; mkIRContinue "FunEq/FunEq" workItem DropInert cans } where - lhss_match = tc1 == tc2 && and (zipWith tcEqType args1 args2) + lhss_match = tc1 == tc2 && eqTypes args1 args2 doInteractWithInert (CTyEqCan { cc_id = cv1, cc_flavor = fl1, cc_tyvar = tv1, cc_rhs = xi1 }) workItem@(CTyEqCan { cc_id = cv2, cc_flavor = fl2, cc_tyvar = tv2, cc_rhs = xi2 }) -- Check for matching LHS | fl1 `canSolve` fl2 && tv1 == tv2 - = do { cans <- rewriteEqLHS LeftComesFromInert (mkCoVarCoercion cv1,xi1) (cv2,fl2,xi2) + = do { cans <- rewriteEqLHS LeftComesFromInert (mkCoVarCo cv1,xi1) (cv2,fl2,xi2) ; mkIRStopK "Eq/Eq lhs" cans } | fl2 `canSolve` fl1 && tv1 == tv2 - = do { cans <- rewriteEqLHS RightComesFromInert (mkCoVarCoercion cv2,xi2) (cv1,fl1,xi1) + = do { cans <- rewriteEqLHS RightComesFromInert (mkCoVarCo cv2,xi2) (cv1,fl1,xi1) ; mkIRContinue "Eq/Eq lhs" workItem DropInert cans } -- Check for rewriting RHS @@ -1157,13 +1152,13 @@ doInteractWithInert _ workItem = noInteraction workItem -- Equational Rewriting rewriteDict :: (CoVar, TcTyVar, Xi) -> (DictId, CtFlavor, Class, [Xi]) -> TcS CanonicalCt rewriteDict (cv,tv,xi) (dv,gw,cl,xis) - = do { let cos = substTysWith [tv] [mkCoVarCoercion cv] xis -- xis[tv] ~ xis[xi] + = do { let cos = map (liftCoSubstWith [tv] [mkCoVarCo cv]) xis -- xis[tv] ~ xis[xi] args = substTysWith [tv] [xi] xis con = classTyCon cl - dict_co = mkTyConCoercion con cos + dict_co = mkTyConAppCo con cos ; dv' <- newDictVar cl args ; case gw of - Wanted {} -> setDictBind dv (EvCast dv' (mkSymCoercion dict_co)) + Wanted {} -> setDictBind dv (EvCast dv' (mkSymCo dict_co)) Given {} -> setDictBind dv' (EvCast dv dict_co) Derived {} -> return () -- Derived dicts we don't set any evidence @@ -1174,11 +1169,11 @@ rewriteDict (cv,tv,xi) (dv,gw,cl,xis) rewriteIP :: (CoVar,TcTyVar,Xi) -> (EvVar,CtFlavor, IPName Name, TcType) -> TcS CanonicalCt rewriteIP (cv,tv,xi) (ipid,gw,nm,ty) - = do { let ip_co = substTyWith [tv] [mkCoVarCoercion cv] ty -- ty[tv] ~ t[xi] - ty' = substTyWith [tv] [xi] ty + = do { let ip_co = liftCoSubstWith [tv] [mkCoVarCo cv] ty -- ty[tv] ~ t[xi] + ty' = substTyWith [tv] [xi] ty ; ipid' <- newIPVar nm ty' ; case gw of - Wanted {} -> setIPBind ipid (EvCast ipid' (mkSymCoercion ip_co)) + Wanted {} -> setIPBind ipid (EvCast ipid' (mkSymCo ip_co)) Given {} -> setIPBind ipid' (EvCast ipid ip_co) Derived {} -> return () -- Derived ips: we don't set any evidence @@ -1189,20 +1184,21 @@ rewriteIP (cv,tv,xi) (ipid,gw,nm,ty) rewriteFunEq :: (CoVar,TcTyVar,Xi) -> (CoVar,CtFlavor,TyCon, [Xi], Xi) -> TcS CanonicalCt rewriteFunEq (cv1,tv,xi1) (cv2,gw, tc,args,xi2) -- cv2 :: F args ~ xi2 - = do { let arg_cos = substTysWith [tv] [mkCoVarCoercion cv1] args - args' = substTysWith [tv] [xi1] args - fun_co = mkTyConCoercion tc arg_cos -- fun_co :: F args ~ F args' + = do { let co_subst = liftCoSubstWith [tv] [mkCoVarCo cv1] + arg_cos = map co_subst args + args' = substTysWith [tv] [xi1] args + fun_co = mkTyConAppCo tc arg_cos -- fun_co :: F args ~ F args' xi2' = substTyWith [tv] [xi1] xi2 - xi2_co = substTyWith [tv] [mkCoVarCoercion cv1] xi2 -- xi2_co :: xi2 ~ xi2' + xi2_co = co_subst xi2 -- xi2_co :: xi2 ~ xi2' ; cv2' <- newCoVar (mkTyConApp tc args') xi2' ; case gw of - Wanted {} -> setCoBind cv2 (fun_co `mkTransCoercion` - mkCoVarCoercion cv2' `mkTransCoercion` - mkSymCoercion xi2_co) - Given {} -> setCoBind cv2' (mkSymCoercion fun_co `mkTransCoercion` - mkCoVarCoercion cv2 `mkTransCoercion` + Wanted {} -> setCoBind cv2 (fun_co `mkTransCo` + mkCoVarCo cv2' `mkTransCo` + mkSymCo xi2_co) + Given {} -> setCoBind cv2' (mkSymCo fun_co `mkTransCo` + mkCoVarCo cv2 `mkTransCo` xi2_co) Derived {} -> return () @@ -1223,20 +1219,20 @@ rewriteEqRHS :: (CoVar,TcTyVar,Xi) -> (CoVar,CtFlavor,TcTyVar,Xi) -> TcS WorkLis rewriteEqRHS (cv1,tv1,xi1) (cv2,gw,tv2,xi2) | Just tv2' <- tcGetTyVar_maybe xi2' , tv2 == tv2' -- In this case xi2[xi1/tv1] = tv2, so we have tv2~tv2 - = do { when (isWanted gw) (setCoBind cv2 (mkSymCoercion co2')) + = do { when (isWanted gw) (setCoBind cv2 (mkSymCo co2')) ; return emptyWorkList } | otherwise = do { cv2' <- newCoVar (mkTyVarTy tv2) xi2' ; case gw of - Wanted {} -> setCoBind cv2 $ mkCoVarCoercion cv2' `mkTransCoercion` - mkSymCoercion co2' - Given {} -> setCoBind cv2' $ mkCoVarCoercion cv2 `mkTransCoercion` + Wanted {} -> setCoBind cv2 $ mkCoVarCo cv2' `mkTransCo` + mkSymCo co2' + Given {} -> setCoBind cv2' $ mkCoVarCo cv2 `mkTransCo` co2' Derived {} -> return () ; canEqToWorkList gw cv2' (mkTyVarTy tv2) xi2' } where xi2' = substTyWith [tv1] [xi1] xi2 - co2' = substTyWith [tv1] [mkCoVarCoercion cv1] xi2 -- xi2 ~ xi2[xi1/tv1] + co2' = liftCoSubstWith [tv1] [mkCoVarCo cv1] xi2 -- xi2 ~ xi2[xi1/tv1] rewriteEqLHS :: WhichComesFromInert -> (Coercion,Xi) -> (CoVar,CtFlavor,Xi) -> TcS WorkList -- Used to ineract two equalities of the following form: @@ -1249,9 +1245,9 @@ rewriteEqLHS LeftComesFromInert (co1,xi1) (cv2,gw,xi2) = do { cv2' <- newCoVar xi2 xi1 ; case gw of Wanted {} -> setCoBind cv2 $ - co1 `mkTransCoercion` mkSymCoercion (mkCoVarCoercion cv2') + co1 `mkTransCo` mkSymCo (mkCoVarCo cv2') Given {} -> setCoBind cv2' $ - mkSymCoercion (mkCoVarCoercion cv2) `mkTransCoercion` co1 + mkSymCo (mkCoVarCo cv2) `mkTransCo` co1 Derived {} -> return () ; mkCanonical gw cv2' } @@ -1259,9 +1255,9 @@ rewriteEqLHS RightComesFromInert (co1,xi1) (cv2,gw,xi2) = do { cv2' <- newCoVar xi1 xi2 ; case gw of Wanted {} -> setCoBind cv2 $ - co1 `mkTransCoercion` mkCoVarCoercion cv2' + co1 `mkTransCo` mkCoVarCo cv2' Given {} -> setCoBind cv2' $ - mkSymCoercion co1 `mkTransCoercion` mkCoVarCoercion cv2 + mkSymCo co1 `mkTransCo` mkCoVarCo cv2 Derived {} -> return () ; mkCanonical gw cv2' } @@ -1269,12 +1265,12 @@ rewriteFrozen :: (CoVar,TcTyVar,Xi) -> (CoVar,CtFlavor) -> TcS WorkList rewriteFrozen (cv1, tv1, xi1) (cv2, fl2) = do { cv2' <- newCoVar ty2a' ty2b' -- ty2a[xi1/tv1] ~ ty2b[xi1/tv1] ; case fl2 of - Wanted {} -> setCoBind cv2 $ co2a' `mkTransCoercion` - mkCoVarCoercion cv2' `mkTransCoercion` - mkSymCoercion co2b' + Wanted {} -> setCoBind cv2 $ co2a' `mkTransCo` + mkCoVarCo cv2' `mkTransCo` + mkSymCo co2b' - Given {} -> setCoBind cv2' $ mkSymCoercion co2a' `mkTransCoercion` - mkCoVarCoercion cv2 `mkTransCoercion` + Given {} -> setCoBind cv2' $ mkSymCo co2a' `mkTransCo` + mkCoVarCo cv2 `mkTransCo` co2b' Derived {} -> return () @@ -1285,8 +1281,8 @@ rewriteFrozen (cv1, tv1, xi1) (cv2, fl2) ty2a' = substTyWith [tv1] [xi1] ty2a ty2b' = substTyWith [tv1] [xi1] ty2b - co2a' = substTyWith [tv1] [mkCoVarCoercion cv1] ty2a -- ty2a ~ ty2a[xi1/tv1] - co2b' = substTyWith [tv1] [mkCoVarCoercion cv1] ty2b -- ty2b ~ ty2b[xi1/tv1] + co2a' = liftCoSubstWith [tv1] [mkCoVarCo cv1] ty2a -- ty2a ~ ty2a[xi1/tv1] + co2b' = liftCoSubstWith [tv1] [mkCoVarCo cv1] ty2b -- ty2b ~ ty2b[xi1/tv1] solveOneFromTheOther :: String -> (EvTerm, CtFlavor) -> CanonicalCt -> TcS InteractResult -- First argument inert, second argument work-item. They both represent @@ -1759,7 +1755,7 @@ doTopReact inerts workItem@(CDictCan { cc_id = dv, cc_flavor = fl@(Wanted loc) ; case m of Nothing -> return NoTopInt Just (xis',cos,fd_work) -> - do { let dict_co = mkTyConCoercion (classTyCon cls) cos + do { let dict_co = mkTyConAppCo (classTyCon cls) cos ; dv'<- newDictVar cls xis' ; setDictBind dv (EvCast dv' dict_co) ; let workItem' = CDictCan { cc_id = dv', cc_flavor = fl, @@ -1812,11 +1808,10 @@ doTopReact _inerts workItem@(CFunEqCan { cc_id = cv, cc_flavor = fl -- RHS of a type function, so that it never -- appears in an error message -- See Note [Type synonym families] in TyCon - coe = mkTyConApp coe_tc rep_tys + coe = mkAxInstCo coe_tc rep_tys ; case fl of Wanted {} -> do { cv' <- newCoVar rhs_ty xi - ; setCoBind cv $ - coe `mkTransCoercion` mkCoVarCoercion cv' + ; setCoBind cv $ coe `mkTransCo` mkCoVarCo cv' ; can_cts <- mkCanonical fl cv' ; let solved = workItem { cc_flavor = solved_fl } solved_fl = mkSolvedFlavor fl UnkSkol @@ -1827,7 +1822,7 @@ doTopReact _inerts workItem@(CFunEqCan { cc_id = cv, cc_flavor = fl , tir_new_inert = ContinueWith solved } } Given {} -> do { cv' <- newGivenCoVar xi rhs_ty $ - mkSymCoercion (mkCoVarCoercion cv) `mkTransCoercion` coe + mkSymCo (mkCoVarCo cv) `mkTransCo` coe ; can_cts <- mkCanonical fl cv' ; return $ SomeTopInt { tir_new_work = can_cts @@ -2062,7 +2057,7 @@ matchClassInst inerts clas tys loc MatchInstSingle (_,_) | given_overlap untch -> do { traceTcS "Delaying instance application" $ - vcat [ text "Workitem=" <+> pprPred (ClassP clas tys) + vcat [ text "Workitem=" <+> pprPredTy (ClassP clas tys) , text "Silents and their superclasses=" <+> ppr silents_and_their_scs , text "All given dictionaries=" <+> ppr all_given_dicts ] ; return NoInstance -- see Note [Instance and Given overlap] @@ -2110,7 +2105,7 @@ matchClassInst inerts clas tys loc does_not_originate_in_a_silent clas sys -- UGLY: See Note [Silent parameters overlapping] - = null $ filter (tcEqPred (ClassP clas sys)) silents_and_their_scs + = null $ filter (eqPred (ClassP clas sys)) silents_and_their_scs silents_and_their_scs = foldlBag (\acc rvnt -> case rvnt of