X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FhsSyn%2FHsBinds.lhs;h=23208f078e347352892287b40eeeec45555a07f7;hb=ac10f8408520a30e8437496d320b8b86afda2e8f;hp=f5959361e5fb991fd5d5de555b51d6a99f0cc951;hpb=ff55074d483155afc78cf151e1f5469ac13b5749;p=ghc-hetmet.git diff --git a/ghc/compiler/hsSyn/HsBinds.lhs b/ghc/compiler/hsSyn/HsBinds.lhs index f595936..23208f0 100644 --- a/ghc/compiler/hsSyn/HsBinds.lhs +++ b/ghc/compiler/hsSyn/HsBinds.lhs @@ -3,136 +3,201 @@ % \section[HsBinds]{Abstract syntax: top-level bindings and signatures} -Datatype for: @HsBinds@, @Bind@, @Sig@, @MonoBinds@. +Datatype for: @BindGroup@, @Bind@, @Sig@, @Bind@. \begin{code} module HsBinds where #include "HsVersions.h" -import {-# SOURCE #-} HsExpr ( pprExpr, HsExpr ) -import {-# SOURCE #-} HsMatches ( pprMatches, Match, pprGRHSs, GRHSs ) +import {-# SOURCE #-} HsExpr ( HsExpr, pprExpr, LHsExpr, + MatchGroup, pprFunBind, + GRHSs, pprPatBind ) +import {-# SOURCE #-} HsPat ( LPat ) --- friends: -import HsTypes ( HsType ) -import CoreSyn ( CoreExpr ) -import PprCore ( {- Instances -} ) - ---others: +import HsTypes ( LHsType, PostTcType ) +import Type ( Type ) import Name ( Name ) -import PrelNames ( isUnboundName ) -import NameSet ( NameSet, elemNameSet, nameSetToList ) -import BasicTypes ( RecFlag(..), Fixity ) +import NameSet ( NameSet, elemNameSet ) +import BasicTypes ( IPName, RecFlag(..), InlineSpec(..), Fixity ) import Outputable -import SrcLoc ( SrcLoc ) -import Var ( TyVar ) -import Class ( DefMeth (..) ) +import SrcLoc ( Located(..), SrcSpan, unLoc ) +import Util ( sortLe ) +import Var ( TyVar, DictId, Id ) +import Bag ( Bag, emptyBag, isEmptyBag, bagToList, unionBags, unionManyBags ) \end{code} %************************************************************************ %* * -\subsection{Bindings: @HsBinds@} +\subsection{Bindings: @BindGroup@} %* * %************************************************************************ -The following syntax may produce new syntax which is not part of the input, -and which is instead a translation of the input to the typechecker. -Syntax translations are marked TRANSLATION in comments. New empty -productions are useful in development but may not appear in the final -grammar. - -Collections of bindings, created by dependency analysis and translation: +Global bindings (where clauses) \begin{code} -data HsBinds id pat -- binders and bindees - = EmptyBinds +data HsLocalBinds id -- Bindings in a 'let' expression + -- or a 'where' clause + = HsValBinds (HsValBinds id) + | HsIPBinds (HsIPBinds id) + | EmptyLocalBinds + +data HsValBinds id -- Value bindings (not implicit parameters) + = ValBindsIn -- Before typechecking + (LHsBinds id) [LSig id] -- Not dependency analysed + -- Recursive by default + + | ValBindsOut -- After renaming + [(RecFlag, LHsBinds id)] -- Dependency analysed + [LSig Name] + +type LHsBinds id = Bag (LHsBind id) +type DictBinds id = LHsBinds id -- Used for dictionary or method bindings +type LHsBind id = Located (HsBind id) + +data HsBind id + = FunBind { -- FunBind is used for both functions f x = e + -- and variables f = \x -> e + -- Reason: the Match stuff lets us have an optional + -- result type sig f :: a->a = ...mentions a... + -- + -- This also means that instance decls can only have + -- FunBinds, so if you change this, you'll need to + -- change e.g. rnMethodBinds + + fun_id :: Located id, + + fun_infix :: Bool, -- True => infix declaration + + fun_matches :: MatchGroup id, -- The payload + + fun_co_fn :: ExprCoFn, -- 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'. That's + -- why coercions are (CoreExpr -> CoreExpr), rather than + -- just CoreExpr (with a functional type) + + bind_fvs :: NameSet -- After the renamer, this contains a superset of the + -- Names of the other binders in this binding group that + -- are free in the RHS of the defn + -- Before renaming, and after typechecking, + -- the field is unused; it's just an error thunk + } + + | PatBind { -- The pattern is never a simple variable; + -- That case is done by FunBind + pat_lhs :: LPat id, + pat_rhs :: GRHSs id, + pat_rhs_ty :: PostTcType, -- Type of the GRHSs + bind_fvs :: NameSet -- Same as for FunBind + } + + | VarBind { -- Dictionary binding and suchlike + var_id :: id, -- All VarBinds are introduced by the type checker + var_rhs :: LHsExpr id -- Located only for consistency + } + + | AbsBinds { -- Binds abstraction; TRANSLATION + abs_tvs :: [TyVar], + abs_dicts :: [DictId], + abs_exports :: [([TyVar], id, id, [Prag])], -- (tvs, poly_id, mono_id, prags) + abs_binds :: LHsBinds id -- The dictionary bindings and typechecked user bindings + -- mixed up together; you can tell the dict bindings because + -- they are all VarBinds + } + -- Consider (AbsBinds tvs ds [(ftvs, poly_f, mono_f) binds] + -- + -- Creates bindings for (polymorphic, overloaded) poly_f + -- in terms of monomorphic, non-overloaded mono_f + -- + -- Invariants: + -- 1. 'binds' binds mono_f + -- 2. ftvs is a subset of tvs + -- 3. ftvs includes all tyvars free in ds + -- + -- See section 9 of static semantics paper for more details. + -- (You can get a PhD for explaining the True Meaning + -- of this last construct.) - | ThenBinds (HsBinds id pat) - (HsBinds id pat) +placeHolderNames :: NameSet +-- Used for the NameSet in FunBind and PatBind prior to the renamer +placeHolderNames = panic "placeHolderNames" + +------------ +instance OutputableBndr id => Outputable (HsLocalBinds id) where + ppr (HsValBinds bs) = ppr bs + ppr (HsIPBinds bs) = ppr bs + ppr EmptyLocalBinds = empty + +instance OutputableBndr id => Outputable (HsValBinds id) where + ppr (ValBindsIn binds sigs) + = pprValBindsForUser binds sigs + + ppr (ValBindsOut sccs sigs) + = getPprStyle $ \ sty -> + if debugStyle sty then -- Print with sccs showing + vcat (map ppr sigs) $$ vcat (map ppr_scc sccs) + else + pprValBindsForUser (unionManyBags (map snd sccs)) sigs + where + ppr_scc (rec_flag, binds) = pp_rec rec_flag <+> pprLHsBinds binds + pp_rec Recursive = ptext SLIT("rec") + pp_rec NonRecursive = ptext SLIT("nonrec") + +-- *not* pprLHsBinds because we don't want braces; 'let' and +-- 'where' include a list of HsBindGroups and we don't want +-- several groups of bindings each with braces around. +-- Sort by location before printing +pprValBindsForUser binds sigs + = vcat (map snd (sort_by_loc decls)) + where - | MonoBind (MonoBinds id pat) - [Sig id] -- Empty on typechecker output - RecFlag -\end{code} + decls :: [(SrcSpan, SDoc)] + decls = [(loc, ppr sig) | L loc sig <- sigs] ++ + [(loc, ppr bind) | L loc bind <- bagToList binds] -\begin{code} -nullBinds :: HsBinds id pat -> Bool + sort_by_loc decls = sortLe (\(l1,_) (l2,_) -> l1 <= l2) decls -nullBinds EmptyBinds = True -nullBinds (ThenBinds b1 b2) = nullBinds b1 && nullBinds b2 -nullBinds (MonoBind b _ _) = nullMonoBinds b +pprLHsBinds :: OutputableBndr id => LHsBinds id -> SDoc +pprLHsBinds binds + | isEmptyLHsBinds binds = empty + | otherwise = lbrace <+> vcat (map ppr (bagToList binds)) <+> rbrace -mkMonoBind :: MonoBinds id pat -> [Sig id] -> RecFlag -> HsBinds id pat -mkMonoBind EmptyMonoBinds _ _ = EmptyBinds -mkMonoBind mbinds sigs is_rec = MonoBind mbinds sigs is_rec -\end{code} +------------ +emptyLocalBinds :: HsLocalBinds a +emptyLocalBinds = EmptyLocalBinds -\begin{code} -instance (Outputable pat, Outputable id) => - Outputable (HsBinds id pat) where - ppr binds = ppr_binds binds - -ppr_binds EmptyBinds = empty -ppr_binds (ThenBinds binds1 binds2) - = ($$) (ppr_binds binds1) (ppr_binds binds2) -ppr_binds (MonoBind bind sigs is_rec) - = vcat [ifNotPprForUser (ptext rec_str), - vcat (map ppr sigs), - ppr bind - ] - where - rec_str = case is_rec of - Recursive -> SLIT("{- rec -}") - NonRecursive -> SLIT("{- nonrec -}") -\end{code} +isEmptyLocalBinds :: HsLocalBinds a -> Bool +isEmptyLocalBinds (HsValBinds ds) = isEmptyValBinds ds +isEmptyLocalBinds (HsIPBinds ds) = isEmptyIPBinds ds +isEmptyLocalBinds EmptyLocalBinds = True -%************************************************************************ -%* * -\subsection{Bindings: @MonoBinds@} -%* * -%************************************************************************ +isEmptyValBinds :: HsValBinds a -> Bool +isEmptyValBinds (ValBindsIn ds sigs) = isEmptyLHsBinds ds && null sigs +isEmptyValBinds (ValBindsOut ds sigs) = null ds && null sigs -Global bindings (where clauses) +emptyValBindsIn, emptyValBindsOut :: HsValBinds a +emptyValBindsIn = ValBindsIn emptyBag [] +emptyValBindsOut = ValBindsOut [] [] -\begin{code} -data MonoBinds id pat - = EmptyMonoBinds - - | AndMonoBinds (MonoBinds id pat) - (MonoBinds id pat) - - | FunMonoBind id -- Used for both functions f x = e - -- and variables f = \x -> e - -- Reason: the Match stuff lets us have an optional - -- result type sig f :: a->a = ...mentions a... - Bool -- True => infix declaration - [Match id pat] - SrcLoc - - | PatMonoBind pat -- The pattern is never a simple variable; - -- That case is done by FunMonoBind - (GRHSs id pat) - SrcLoc - - | VarMonoBind id -- TRANSLATION - (HsExpr id pat) - - | CoreMonoBind id -- TRANSLATION - CoreExpr -- No zonking; this is a final CoreExpr with Ids and Types! - - | AbsBinds -- Binds abstraction; TRANSLATION - [TyVar] -- Type variables - [id] -- Dicts - [([TyVar], id, id)] -- (type variables, polymorphic, momonmorphic) triples - NameSet -- Set of *polymorphic* variables that have an INLINE pragma - (MonoBinds id pat) -- The "business end" - - -- Creates bindings for *new* (polymorphic, overloaded) locals - -- in terms of *old* (monomorphic, non-overloaded) ones. - -- - -- See section 9 of static semantics paper for more details. - -- (You can get a PhD for explaining the True Meaning - -- of this last construct.) +emptyLHsBinds :: LHsBinds id +emptyLHsBinds = emptyBag + +isEmptyLHsBinds :: LHsBinds id -> Bool +isEmptyLHsBinds = isEmptyBag + +------------ +plusHsValBinds :: HsValBinds a -> HsValBinds a -> HsValBinds a +plusHsValBinds (ValBindsIn ds1 sigs1) (ValBindsIn ds2 sigs2) + = ValBindsIn (ds1 `unionBags` ds2) (sigs1 ++ sigs2) +plusHsValBinds (ValBindsOut ds1 sigs1) (ValBindsOut ds2 sigs2) + = ValBindsOut (ds1 ++ ds2) (sigs1 ++ sigs2) \end{code} What AbsBinds means @@ -156,71 +221,100 @@ So the desugarer tries to do a better job: (fm,gm) -> fm ..ditto for gp.. - p = /\ [a,b] -> \ [d1,d2] -> letrec DBINDS and BIND - in (fm,gm) + tp = /\ [a,b] -> \ [d1,d2] -> letrec DBINDS and BIND + in (fm,gm) \begin{code} --- We keep the invariant that a MonoBinds is only empty --- if it is exactly EmptyMonoBinds +instance OutputableBndr id => Outputable (HsBind id) where + ppr mbind = ppr_monobind mbind -nullMonoBinds :: MonoBinds id pat -> Bool -nullMonoBinds EmptyMonoBinds = True -nullMonoBinds other_monobind = False +ppr_monobind :: OutputableBndr id => HsBind id -> SDoc -andMonoBinds :: MonoBinds id pat -> MonoBinds id pat -> MonoBinds id pat -andMonoBinds EmptyMonoBinds mb = mb -andMonoBinds mb EmptyMonoBinds = mb -andMonoBinds mb1 mb2 = AndMonoBinds mb1 mb2 +ppr_monobind (PatBind { pat_lhs = pat, pat_rhs = grhss }) = pprPatBind pat grhss +ppr_monobind (VarBind { var_id = var, var_rhs = rhs }) = ppr var <+> equals <+> pprExpr (unLoc rhs) +ppr_monobind (FunBind { fun_id = fun, fun_matches = matches }) = pprFunBind (unLoc fun) matches + -- ToDo: print infix if appropriate -andMonoBindList :: [MonoBinds id pat] -> MonoBinds id pat -andMonoBindList binds - = loop1 binds +ppr_monobind (AbsBinds { abs_tvs = tyvars, abs_dicts = dictvars, + abs_exports = exports, abs_binds = val_binds }) + = sep [ptext SLIT("AbsBinds"), + brackets (interpp'SP tyvars), + brackets (interpp'SP dictvars), + brackets (sep (punctuate comma (map ppr_exp exports)))] + $$ + nest 2 ( vcat [pprBndr LetBind x | (_,x,_,_) <- exports] + -- Print type signatures + $$ pprLHsBinds val_binds ) where - loop1 [] = EmptyMonoBinds - loop1 (EmptyMonoBinds : binds) = loop1 binds - loop1 (b:bs) = loop2 b bs - - -- acc is non-empty - loop2 acc [] = acc - loop2 acc (EmptyMonoBinds : bs) = loop2 acc bs - loop2 acc (b:bs) = loop2 (acc `AndMonoBinds` b) bs + ppr_exp (tvs, gbl, lcl, prags) + = vcat [ppr gbl <+> ptext SLIT("<=") <+> ppr tvs <+> ppr lcl, + nest 2 (vcat (map (pprPrag gbl) prags))] \end{code} +%************************************************************************ +%* * + Implicit parameter bindings +%* * +%************************************************************************ \begin{code} -instance (Outputable id, Outputable pat) => - Outputable (MonoBinds id pat) where - ppr mbind = ppr_monobind mbind +data HsIPBinds id + = IPBinds + [LIPBind id] + (DictBinds id) -- Only in typechecker output; binds + -- uses of the implicit parameters +isEmptyIPBinds :: HsIPBinds id -> Bool +isEmptyIPBinds (IPBinds is ds) = null is && isEmptyBag ds -ppr_monobind :: (Outputable id, Outputable pat) => MonoBinds id pat -> SDoc -ppr_monobind EmptyMonoBinds = empty -ppr_monobind (AndMonoBinds binds1 binds2) - = ppr_monobind binds1 $$ ppr_monobind binds2 +type LIPBind id = Located (IPBind id) -ppr_monobind (PatMonoBind pat grhss locn) - = sep [ppr pat, nest 4 (pprGRHSs False grhss)] +-- | Implicit parameter bindings. +data IPBind id + = IPBind + (IPName id) + (LHsExpr id) -ppr_monobind (FunMonoBind fun inf matches locn) - = pprMatches (False, ppr fun) matches - -- ToDo: print infix if appropriate +instance (OutputableBndr id) => Outputable (HsIPBinds id) where + ppr (IPBinds bs ds) = vcat (map ppr bs) + $$ pprLHsBinds ds -ppr_monobind (VarMonoBind name expr) - = sep [ppr name <+> equals, nest 4 (pprExpr expr)] +instance (OutputableBndr id) => Outputable (IPBind id) where + ppr (IPBind id rhs) = pprBndr LetBind id <+> equals <+> pprExpr (unLoc rhs) +\end{code} -ppr_monobind (CoreMonoBind name expr) - = sep [ppr name <+> equals, nest 4 (ppr expr)] -ppr_monobind (AbsBinds tyvars dictvars exports inlines val_binds) - = sep [ptext SLIT("AbsBinds"), - brackets (interpp'SP tyvars), - brackets (interpp'SP dictvars), - brackets (sep (punctuate comma (map ppr exports))), - brackets (interpp'SP (nameSetToList inlines))] - $$ - nest 4 (ppr val_binds) +%************************************************************************ +%* * +\subsection{Coercion functions} +%* * +%************************************************************************ + +\begin{code} +-- A Coercion is an expression with a hole in it +-- We need coercions to have concrete form so that we can zonk them + +data ExprCoFn + = CoHole -- The identity coercion + | CoCompose ExprCoFn ExprCoFn + | CoApps ExprCoFn [Id] -- Non-empty list + | CoTyApps ExprCoFn [Type] -- in all of these + | CoLams [Id] ExprCoFn -- so that the identity coercion + | CoTyLams [TyVar] ExprCoFn -- is just Hole + | CoLet (LHsBinds Id) ExprCoFn -- Would be nicer to be core bindings + +(<.>) :: ExprCoFn -> ExprCoFn -> ExprCoFn +(<.>) = CoCompose + +idCoercion :: ExprCoFn +idCoercion = CoHole + +isIdCoercion :: ExprCoFn -> Bool +isIdCoercion CoHole = True +isIdCoercion other = False \end{code} + %************************************************************************ %* * \subsection{@Sig@: type signatures and value-modifying user pragmas} @@ -233,160 +327,151 @@ signatures. Then all the machinery to move them into place, etc., serves for both. \begin{code} -data Sig name - = Sig name -- a bog-std type signature - (HsType name) - SrcLoc +type LSig name = Located (Sig name) - | ClassOpSig name -- Selector name - (Maybe (DefMeth name)) -- Nothing for source-file class signatures - -- Gives DefMeth info for interface files sigs - (HsType name) - SrcLoc - - | SpecSig name -- specialise a function or datatype ... - (HsType name) -- ... to these types - SrcLoc +data Sig name + = TypeSig (Located name) -- A bog-std type signature + (LHsType name) - | InlineSig name -- INLINE f - (Maybe Int) -- phase - SrcLoc + | SpecSig (Located name) -- Specialise a function or datatype ... + (LHsType name) -- ... to these types + InlineSpec - | NoInlineSig name -- NOINLINE f - (Maybe Int) -- phase - SrcLoc + | InlineSig (Located name) -- Function name + InlineSpec - | SpecInstSig (HsType name) -- (Class tys); should be a specialisation of the + | SpecInstSig (LHsType name) -- (Class tys); should be a specialisation of the -- current instance decl - SrcLoc | FixSig (FixitySig name) -- Fixity declaration +type LFixitySig name = Located (FixitySig name) +data FixitySig name = FixitySig (Located name) Fixity + +-- A Prag conveys pragmas from the type checker to the desugarer +data Prag + = InlinePrag + InlineSpec -data FixitySig name = FixitySig name Fixity SrcLoc + | SpecPrag + (HsExpr Id) -- An expression, of the given specialised type, which + PostTcType -- specialises the polymorphic function + [Id] -- Dicts mentioned free in the expression + InlineSpec -- Inlining spec for the specialised function -instance Eq name => Eq (FixitySig name) where - (FixitySig n1 f1 _) == (FixitySig n2 f2 _) = n1==n2 && f1==f2 +isInlinePrag (InlinePrag _) = True +isInlinePrag prag = False + +isSpecPrag (SpecPrag _ _ _ _) = True +isSpecPrag prag = False \end{code} \begin{code} -okBindSig :: NameSet -> Sig Name -> Bool -okBindSig ns (ClassOpSig _ _ _ _) = False +okBindSig :: NameSet -> LSig Name -> Bool okBindSig ns sig = sigForThisGroup ns sig -okClsDclSig :: NameSet -> Sig Name -> Bool -okClsDclSig ns (Sig _ _ _) = False -okClsDclSig ns sig = sigForThisGroup ns sig +okHsBootSig :: LSig Name -> Bool +okHsBootSig (L _ (TypeSig _ _)) = True +okHsBootSig (L _ (FixSig _)) = True +okHsBootSig sig = False -okInstDclSig :: NameSet -> Sig Name -> Bool -okInstDclSig ns (Sig _ _ _) = False -okInstDclSig ns (FixSig _) = False -okInstDclSig ns (SpecInstSig _ _) = True -okInstDclSig ns sig = sigForThisGroup ns sig +okClsDclSig :: LSig Name -> Bool +okClsDclSig (L _ (SpecInstSig _)) = False +okClsDclSig sig = True -- All others OK -sigForThisGroup ns sig +okInstDclSig :: NameSet -> LSig Name -> Bool +okInstDclSig ns lsig@(L _ sig) = ok ns sig + where + ok ns (TypeSig _ _) = False + ok ns (FixSig _) = False + ok ns (SpecInstSig _) = True + ok ns sig = sigForThisGroup ns lsig + +sigForThisGroup :: NameSet -> LSig Name -> Bool +sigForThisGroup ns sig = case sigName sig of - Nothing -> False - Just n | isUnboundName n -> True -- Don't complain about an unbound name again - | otherwise -> n `elemNameSet` ns - -sigName :: Sig name -> Maybe name -sigName (Sig n _ _) = Just n -sigName (ClassOpSig n _ _ _) = Just n -sigName (SpecSig n _ _) = Just n -sigName (InlineSig n _ _) = Just n -sigName (NoInlineSig n _ _) = Just n -sigName (FixSig (FixitySig n _ _)) = Just n -sigName other = Nothing - -isFixitySig :: Sig name -> Bool -isFixitySig (FixSig _) = True -isFixitySig _ = False - -isClassOpSig :: Sig name -> Bool -isClassOpSig (ClassOpSig _ _ _ _) = True -isClassOpSig _ = False - -isPragSig :: Sig name -> Bool + Nothing -> False + Just n -> n `elemNameSet` ns + +sigName :: LSig name -> Maybe name +sigName (L _ sig) = f sig + where + f (TypeSig n _) = Just (unLoc n) + f (SpecSig n _ _) = Just (unLoc n) + f (InlineSig n _) = Just (unLoc n) + f (FixSig (FixitySig n _)) = Just (unLoc n) + f other = Nothing + +isFixityLSig :: LSig name -> Bool +isFixityLSig (L _ (FixSig {})) = True +isFixityLSig _ = False + +isVanillaLSig :: LSig name -> Bool +isVanillaLSig (L _(TypeSig {})) = True +isVanillaLSig sig = False + +isSpecLSig :: LSig name -> Bool +isSpecLSig (L _(SpecSig {})) = True +isSpecLSig sig = False + +isSpecInstLSig (L _ (SpecInstSig {})) = True +isSpecInstLSig sig = False + +isPragLSig :: LSig name -> Bool -- Identifies pragmas -isPragSig (SpecSig _ _ _) = True -isPragSig (InlineSig _ _ _) = True -isPragSig (NoInlineSig _ _ _) = True -isPragSig (SpecInstSig _ _) = True -isPragSig other = False +isPragLSig (L _ (SpecSig {})) = True +isPragLSig (L _ (InlineSig {})) = True +isPragLSig other = False + +isInlineLSig :: LSig name -> Bool + -- Identifies inline pragmas +isInlineLSig (L _ (InlineSig {})) = True +isInlineLSig other = False + +hsSigDoc (TypeSig {}) = ptext SLIT("type signature") +hsSigDoc (SpecSig {}) = ptext SLIT("SPECIALISE pragma") +hsSigDoc (InlineSig _ spec) = ppr spec <+> ptext SLIT("pragma") +hsSigDoc (SpecInstSig {}) = ptext SLIT("SPECIALISE instance pragma") +hsSigDoc (FixSig {}) = ptext SLIT("fixity declaration") \end{code} +Signature equality is used when checking for duplicate signatures + \begin{code} -hsSigDoc (Sig _ _ loc) = (SLIT("type signature"),loc) -hsSigDoc (ClassOpSig _ _ _ loc) = (SLIT("class-method type signature"), loc) -hsSigDoc (SpecSig _ _ loc) = (SLIT("SPECIALISE pragma"),loc) -hsSigDoc (InlineSig _ _ loc) = (SLIT("INLINE pragma"),loc) -hsSigDoc (NoInlineSig _ _ loc) = (SLIT("NOINLINE pragma"),loc) -hsSigDoc (SpecInstSig _ loc) = (SLIT("SPECIALISE instance pragma"),loc) -hsSigDoc (FixSig (FixitySig _ _ loc)) = (SLIT("fixity declaration"), loc) +eqHsSig :: LSig Name -> LSig Name -> Bool +eqHsSig (L _ (FixSig (FixitySig n1 _))) (L _ (FixSig (FixitySig n2 _))) = unLoc n1 == unLoc n2 +eqHsSig (L _ (TypeSig n1 _)) (L _ (TypeSig n2 _)) = unLoc n1 == unLoc n2 +eqHsSig (L _ (InlineSig n1 s1)) (L _ (InlineSig n2 s2)) = s1 == s2 && unLoc n1 == unLoc n2 + -- For specialisations, we don't have equality over + -- HsType, so it's not convenient to spot duplicate + -- specialisations here. Check for this later, when we're in Type land +eqHsSig _other1 _other2 = False \end{code} \begin{code} -instance (Outputable name) => Outputable (Sig name) where +instance (OutputableBndr name) => Outputable (Sig name) where ppr sig = ppr_sig sig -ppr_sig :: Outputable name => Sig name -> SDoc -ppr_sig (Sig var ty _) - = sep [ppr var <+> dcolon, nest 4 (ppr ty)] - -ppr_sig (ClassOpSig var dm ty _) - = sep [ppr var <+> pp_dm <+> dcolon, nest 4 (ppr ty)] - where - pp_dm = case dm of - Just (DefMeth _) -> equals -- Default method indicator - Just GenDefMeth -> semi -- Generic method indicator - Just NoDefMeth -> empty -- No Method at all - -- Not convinced this is right... - -- Not used in interface file output hopefully - -- but needed for ddump-rn ?? - other -> dot - -- empty -- No method at all - - -ppr_sig (SpecSig var ty _) - = sep [ hsep [text "{-# SPECIALIZE", ppr var, dcolon], - nest 4 (ppr ty <+> text "#-}") - ] - -ppr_sig (InlineSig var phase _) - = hsep [text "{-# INLINE", ppr_phase phase, ppr var, text "#-}"] - -ppr_sig (NoInlineSig var phase _) - = hsep [text "{-# NOINLINE", ppr_phase phase, ppr var, text "#-}"] - -ppr_sig (SpecInstSig ty _) - = hsep [text "{-# SPECIALIZE instance", ppr ty, text "#-}"] - -ppr_sig (FixSig fix_sig) = ppr fix_sig - +ppr_sig :: OutputableBndr name => Sig name -> SDoc +ppr_sig (TypeSig var ty) = pprVarSig (unLoc var) ty +ppr_sig (FixSig fix_sig) = ppr fix_sig +ppr_sig (SpecSig var ty inl) = pragBrackets (pprSpec var ty inl) +ppr_sig (InlineSig var inl) = pragBrackets (ppr inl <+> ppr var) +ppr_sig (SpecInstSig ty) = pragBrackets (ptext SLIT("SPECIALIZE instance") <+> ppr ty) instance Outputable name => Outputable (FixitySig name) where - ppr (FixitySig name fixity loc) = sep [ppr fixity, ppr name] + ppr (FixitySig name fixity) = sep [ppr fixity, ppr name] -ppr_phase :: Maybe Int -> SDoc -ppr_phase Nothing = empty -ppr_phase (Just n) = int n -\end{code} +pragBrackets :: SDoc -> SDoc +pragBrackets doc = ptext SLIT("{-#") <+> doc <+> ptext SLIT("#-}") -Checking for distinct signatures; oh, so boring +pprVarSig :: (Outputable id, Outputable ty) => id -> ty -> SDoc +pprVarSig var ty = sep [ppr var <+> dcolon, nest 2 (ppr ty)] +pprSpec :: (Outputable id, Outputable ty) => id -> ty -> InlineSpec -> SDoc +pprSpec var ty inl = sep [ptext SLIT("SPECIALIZE") <+> ppr inl <+> pprVarSig var ty] -\begin{code} -eqHsSig :: Sig Name -> Sig Name -> Bool -eqHsSig (Sig n1 _ _) (Sig n2 _ _) = n1 == n2 -eqHsSig (InlineSig n1 _ _) (InlineSig n2 _ _) = n1 == n2 -eqHsSig (NoInlineSig n1 _ _) (NoInlineSig n2 _ _) = n1 == n2 - -eqHsSig (SpecInstSig ty1 _) (SpecInstSig ty2 _) = ty1 == ty2 -eqHsSig (SpecSig n1 ty1 _) (SpecSig n2 ty2 _) - = -- may have many specialisations for one value; - -- but not ones that are exactly the same... - (n1 == n2) && (ty1 == ty2) - -eqHsSig other_1 other_2 = False +pprPrag :: Outputable id => id -> Prag -> SDoc +pprPrag var (InlinePrag inl) = ppr inl <+> ppr var +pprPrag var (SpecPrag expr ty _ inl) = pprSpec var ty inl \end{code}