diff options
Diffstat (limited to 'compiler/GHC/Hs/Binds.hs')
| -rw-r--r-- | compiler/GHC/Hs/Binds.hs | 75 |
1 files changed, 33 insertions, 42 deletions
diff --git a/compiler/GHC/Hs/Binds.hs b/compiler/GHC/Hs/Binds.hs index adb8604913..1c393bbe99 100644 --- a/compiler/GHC/Hs/Binds.hs +++ b/compiler/GHC/Hs/Binds.hs @@ -12,11 +12,13 @@ Datatype for: @BindGroup@, @Bind@, @Sig@, @Bind@. {-# LANGUAGE StandaloneDeriving #-} {-# LANGUAGE FlexibleContexts #-} {-# LANGUAGE FlexibleInstances #-} -{-# LANGUAGE UndecidableInstances #-} -- Note [Pass sensitive types] - -- in module GHC.Hs.PlaceHolder +{-# LANGUAGE UndecidableInstances #-} -- Wrinkle in Note [Trees That Grow] + -- in module GHC.Hs.Extension {-# LANGUAGE ConstraintKinds #-} {-# LANGUAGE BangPatterns #-} {-# LANGUAGE TypeFamilies #-} +{-# LANGUAGE ScopedTypeVariables #-} +{-# LANGUAGE TypeApplications #-} module GHC.Hs.Binds where @@ -219,29 +221,29 @@ data HsBindLR idL idR -- For details on above see note [Api annotations] in ApiAnnotation FunBind { - fun_ext :: XFunBind idL idR, -- ^ After the renamer, this contains - -- the locally-bound - -- free variables of this defn. - -- See Note [Bind free vars] + fun_ext :: XFunBind idL idR, + + -- ^ After the renamer (but before the type-checker), this contains the + -- locally-bound free variables of this defn. See Note [Bind free vars] + -- + -- After the type-checker, this contains a coercion from the type of + -- the MatchGroup to the type of the Id. Example: + -- + -- @ + -- f :: Int -> forall a. a -> a + -- f x y = y + -- @ + -- + -- Then the MatchGroup will have type (Int -> a' -> a') + -- (with a free type variable a'). The coercion will take + -- a CoreExpr of this type and convert it to a CoreExpr of + -- type Int -> forall a'. a' -> a' + -- Notice that the coercion captures the free a'. fun_id :: Located (IdP idL), -- Note [fun_id in Match] in GHC.Hs.Expr fun_matches :: MatchGroup idR (LHsExpr idR), -- ^ The payload - fun_co_fn :: HsWrapper, -- ^ Coercion from the type of the MatchGroup to the type of - -- the Id. Example: - -- - -- @ - -- f :: Int -> forall a. a -> a - -- f x y = y - -- @ - -- - -- Then the MatchGroup will have type (Int -> a' -> a') - -- (with a free type variable a'). The coercion will take - -- a CoreExpr of this type and convert it to a CoreExpr of - -- type Int -> forall a'. a' -> a' - -- Notice that the coercion captures the free a'. - fun_tick :: [Tickish Id] -- ^ Ticks to put on the rhs, if any } @@ -320,8 +322,8 @@ data NPatBindTc = NPatBindTc { } deriving Data type instance XFunBind (GhcPass pL) GhcPs = NoExtField -type instance XFunBind (GhcPass pL) GhcRn = NameSet -- Free variables -type instance XFunBind (GhcPass pL) GhcTc = NameSet -- Free variables +type instance XFunBind (GhcPass pL) GhcRn = NameSet -- Free variables +type instance XFunBind (GhcPass pL) GhcTc = HsWrapper -- See comments on FunBind.fun_ext type instance XPatBind GhcPs (GhcPass pR) = NoExtField type instance XPatBind GhcRn (GhcPass pR) = NameSet -- Free variables @@ -682,19 +684,6 @@ pprDeclList ds = pprDeeperList vcat ds emptyLocalBinds :: HsLocalBindsLR (GhcPass a) (GhcPass b) emptyLocalBinds = EmptyLocalBinds noExtField --- AZ:These functions do not seem to be used at all? -isEmptyLocalBindsTc :: HsLocalBindsLR (GhcPass a) GhcTc -> Bool -isEmptyLocalBindsTc (HsValBinds _ ds) = isEmptyValBinds ds -isEmptyLocalBindsTc (HsIPBinds _ ds) = isEmptyIPBindsTc ds -isEmptyLocalBindsTc (EmptyLocalBinds _) = True -isEmptyLocalBindsTc (XHsLocalBindsLR _) = True - -isEmptyLocalBindsPR :: HsLocalBindsLR (GhcPass a) (GhcPass b) -> Bool -isEmptyLocalBindsPR (HsValBinds _ ds) = isEmptyValBinds ds -isEmptyLocalBindsPR (HsIPBinds _ ds) = isEmptyIPBindsPR ds -isEmptyLocalBindsPR (EmptyLocalBinds _) = True -isEmptyLocalBindsPR (XHsLocalBindsLR _) = True - eqEmptyLocalBinds :: HsLocalBindsLR a b -> Bool eqEmptyLocalBinds (EmptyLocalBinds _) = True eqEmptyLocalBinds _ = False @@ -728,7 +717,8 @@ instance (OutputableBndrId pl, OutputableBndrId pr) => Outputable (HsBindLR (GhcPass pl) (GhcPass pr)) where ppr mbind = ppr_monobind mbind -ppr_monobind :: (OutputableBndrId idL, OutputableBndrId idR) +ppr_monobind :: forall idL idR. + (OutputableBndrId idL, OutputableBndrId idR) => HsBindLR (GhcPass idL) (GhcPass idR) -> SDoc ppr_monobind (PatBind { pat_lhs = pat, pat_rhs = grhss }) @@ -736,14 +726,15 @@ ppr_monobind (PatBind { pat_lhs = pat, pat_rhs = grhss }) ppr_monobind (VarBind { var_id = var, var_rhs = rhs }) = sep [pprBndr CasePatBind var, nest 2 $ equals <+> pprExpr (unLoc rhs)] ppr_monobind (FunBind { fun_id = fun, - fun_co_fn = wrap, fun_matches = matches, - fun_tick = ticks }) + fun_tick = ticks, + fun_ext = wrap }) = pprTicks empty (if null ticks then empty else text "-- ticks = " <> ppr ticks) $$ whenPprDebug (pprBndr LetBind (unLoc fun)) $$ pprFunBind matches - $$ whenPprDebug (ppr wrap) + $$ whenPprDebug (pprIfTc @idR $ ppr wrap) + ppr_monobind (PatSynBind _ psb) = ppr psb ppr_monobind (AbsBinds { abs_tvs = tyvars, abs_ev_vars = dictvars , abs_exports = exports, abs_binds = val_binds @@ -759,7 +750,7 @@ ppr_monobind (AbsBinds { abs_tvs = tyvars, abs_ev_vars = dictvars , text "Exported types:" <+> vcat [pprBndr LetBind (abe_poly ex) | ex <- exports] , text "Binds:" <+> pprLHsBinds val_binds - , text "Evidence:" <+> ppr ev_binds ] + , pprIfTc @idR (text "Evidence:" <+> ppr ev_binds) ] else pprLHsBinds val_binds ppr_monobind (XHsBindsLR x) = ppr x @@ -768,7 +759,7 @@ instance OutputableBndrId p => Outputable (ABExport (GhcPass p)) where ppr (ABE { abe_wrap = wrap, abe_poly = gbl, abe_mono = lcl, abe_prags = prags }) = vcat [ ppr gbl <+> text "<=" <+> ppr lcl , nest 2 (pprTcSpecPrags prags) - , nest 2 (text "wrap:" <+> ppr wrap)] + , pprIfTc @p $ nest 2 (text "wrap:" <+> ppr wrap) ] ppr (XABExport x) = ppr x instance (OutputableBndrId l, OutputableBndrId r, @@ -867,7 +858,7 @@ type instance XXIPBind (GhcPass p) = NoExtCon instance OutputableBndrId p => Outputable (HsIPBinds (GhcPass p)) where ppr (IPBinds ds bs) = pprDeeperList vcat (map ppr bs) - $$ whenPprDebug (ppr ds) + $$ whenPprDebug (pprIfTc @p $ ppr ds) ppr (XHsIPBinds x) = ppr x instance OutputableBndrId p => Outputable (IPBind (GhcPass p)) where |