%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[HsBinds]{Abstract syntax: top-level bindings and signatures}
-Datatype for: @HsBinds@, @Bind@, @Sig@, @MonoBinds@.
+Datatype for: @BindGroup@, @Bind@, @Sig@, @Bind@.
\begin{code}
-#include "HsVersions.h"
-
module HsBinds where
-IMP_Ubiq()
+#include "HsVersions.h"
--- friends:
-#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ <= 201
-IMPORT_DELOOPER(HsLoop) ( pprMatches, pprGRHSsAndBinds,
- Match, GRHSsAndBinds,
- pprExpr, HsExpr )
-#endif
+import {-# SOURCE #-} HsExpr ( HsExpr, pprExpr, LHsExpr,
+ LMatch, pprFunBind,
+ GRHSs, pprPatBind )
-import HsPragmas ( GenPragmas, ClassOpPragmas )
-import HsTypes ( HsType )
-import CoreSyn ( SYN_IE(CoreExpr) )
+-- friends:
+import HsPat ( LPat )
+import HsTypes ( LHsType )
--others:
-import Id ( SYN_IE(DictVar), SYN_IE(Id), GenId )
-import Name ( OccName, NamedThing(..) )
-import Outputable ( interpp'SP, ifnotPprForUser, pprQuote,
- Outputable(..){-instance * (,)-}
- )
-import PprCore --( GenCoreExpr {- instance Outputable -} )
-import PprType ( GenTyVar {- instance Outputable -} )
-import Pretty
-import Bag
-import SrcLoc ( SrcLoc{-instances-} )
-import TyVar ( GenTyVar{-instances-} )
-import Unique ( Unique {- instance Eq -} )
-
-#if __GLASGOW_HASKELL__ >= 202
-import {-# SOURCE #-} HsExpr ( pprExpr, HsExpr )
-import {-# SOURCE #-} HsMatches ( pprMatches, Match, pprGRHSsAndBinds, GRHSsAndBinds )
-#endif
-
+import Name ( Name )
+import NameSet ( NameSet, elemNameSet, nameSetToList )
+import BasicTypes ( IPName, RecFlag(..), Activation(..), Fixity )
+import Outputable
+import SrcLoc ( Located(..), unLoc )
+import Var ( TyVar )
+import Bag ( Bag, bagToList )
\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:
-
-\begin{code}
-data HsBinds tyvar uvar id pat -- binders and bindees
- = EmptyBinds
-
- | ThenBinds (HsBinds tyvar uvar id pat)
- (HsBinds tyvar uvar id pat)
-
- | MonoBind (MonoBinds tyvar uvar id pat)
- [Sig id] -- Empty on typechecker output
- RecFlag
-
-type RecFlag = Bool
-recursive = True
-nonRecursive = False
-\end{code}
-
-\begin{code}
-nullBinds :: HsBinds tyvar uvar id pat -> Bool
-
-nullBinds EmptyBinds = True
-nullBinds (ThenBinds b1 b2) = nullBinds b1 && nullBinds b2
-nullBinds (MonoBind b _ _) = nullMonoBinds b
-\end{code}
+Global bindings (where clauses)
\begin{code}
-instance (Outputable pat, NamedThing id, Outputable id,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) =>
- Outputable (HsBinds tyvar uvar id pat) where
-
- ppr sty binds = pprQuote sty (\ sty -> ppr_binds sty binds)
-
-ppr_binds sty EmptyBinds = empty
-ppr_binds sty (ThenBinds binds1 binds2)
- = ($$) (ppr_binds sty binds1) (ppr_binds sty binds2)
-ppr_binds sty (MonoBind bind sigs is_rec)
- = vcat [
- ifnotPprForUser sty (ptext rec_str),
- if null sigs
- then empty
- else vcat (map (ppr sty) sigs),
- ppr sty bind
+data HsBindGroup id
+ = HsBindGroup -- A mutually recursive group
+ (LHsBinds id)
+ [LSig id] -- Empty on typechecker output, Type Signatures
+ RecFlag
+
+ | HsIPBinds
+ [LIPBind id] -- Not allowed at top level
+
+instance OutputableBndr id => Outputable (HsBindGroup id) where
+ ppr (HsBindGroup binds sigs is_rec)
+ = vcat [ppr_isrec,
+ vcat (map ppr sigs),
+ vcat (map ppr (bagToList binds))
]
where
- rec_str | is_rec = SLIT("{- rec -}")
- | otherwise = SLIT("{- nonrec -}")
-\end{code}
-
-%************************************************************************
-%* *
-\subsection{Bindings: @MonoBinds@}
-%* *
-%************************************************************************
-
-Global bindings (where clauses)
-
-\begin{code}
-data MonoBinds tyvar uvar id pat
- = EmptyMonoBinds
-
- | AndMonoBinds (MonoBinds tyvar uvar id pat)
- (MonoBinds tyvar uvar id pat)
-
- | PatMonoBind pat
- (GRHSsAndBinds tyvar uvar id pat)
- SrcLoc
-
- | FunMonoBind id
- Bool -- True => infix declaration
- [Match tyvar uvar id pat] -- must have at least one Match
- SrcLoc
-
- | VarMonoBind id -- TRANSLATION
- (HsExpr tyvar uvar 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
- (MonoBinds tyvar uvar id pat) -- The "business end"
+ ppr_isrec = getPprStyle $ \ sty ->
+ if userStyle sty then empty else
+ case is_rec of
+ Recursive -> ptext SLIT("{- rec -}")
+ NonRecursive -> ptext SLIT("{- nonrec -}")
+
+ ppr (HsIPBinds ipbinds)
+ = vcat (map ppr ipbinds)
+
+-- -----------------------------------------------------------------------------
+-- Implicit parameter bindings
+
+type LIPBind id = Located (IPBind id)
+
+-- | Implicit parameter bindings.
+data IPBind id
+ = IPBind
+ (IPName id)
+ (LHsExpr id)
+
+instance (OutputableBndr id) => Outputable (IPBind id) where
+ ppr (IPBind id rhs) = pprBndr LetBind id <+> equals <+> pprExpr (unLoc rhs)
+
+-- -----------------------------------------------------------------------------
+
+type LHsBinds id = Bag (LHsBind id)
+type LHsBind id = Located (HsBind id)
+
+data HsBind id
+ = FunBind (Located 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...
+ --
+ -- This also means that instance decls can only have
+ -- FunBinds, so if you change this, you'll need to
+ -- change e.g. rnMethodBinds
+ Bool -- True => infix declaration
+ [LMatch id]
+
+ | PatBind (LPat id) -- The pattern is never a simple variable;
+ -- That case is done by FunBind
+ (GRHSs id)
+
+ | VarBind id (Located (HsExpr id)) -- Dictionary binding and suchlike;
+ -- located only for consistency
+
+ | 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
+ (LHsBinds id) -- The "business end"
-- Creates bindings for *new* (polymorphic, overloaded) locals
-- in terms of *old* (monomorphic, non-overloaded) ones.
(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}
-nullMonoBinds :: MonoBinds tyvar uvar id pat -> Bool
-
-nullMonoBinds EmptyMonoBinds = True
-nullMonoBinds (AndMonoBinds bs1 bs2) = nullMonoBinds bs1 && nullMonoBinds bs2
-nullMonoBinds other_monobind = False
+instance OutputableBndr id => Outputable (HsBind id) where
+ ppr mbind = ppr_monobind mbind
-andMonoBinds :: [MonoBinds tyvar uvar id pat] -> MonoBinds tyvar uvar id pat
-andMonoBinds binds = foldr AndMonoBinds EmptyMonoBinds binds
-\end{code}
+ppr_monobind :: OutputableBndr id => HsBind id -> SDoc
-\begin{code}
-instance (NamedThing id, Outputable id, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) =>
- Outputable (MonoBinds tyvar uvar id pat) where
- ppr sty mbind = pprQuote sty (\ sty -> ppr_monobind sty mbind)
-
-
-ppr_monobind sty EmptyMonoBinds = empty
-ppr_monobind sty (AndMonoBinds binds1 binds2)
- = ($$) (ppr_monobind sty binds1) (ppr_monobind sty binds2)
-
-ppr_monobind sty (PatMonoBind pat grhss_n_binds locn)
- = sep [ppr sty pat, nest 4 (pprGRHSsAndBinds sty False grhss_n_binds)]
-
-ppr_monobind sty (FunMonoBind fun inf matches locn)
- = pprMatches sty (False, ppr sty fun) matches
+ppr_monobind (PatBind pat grhss) = pprPatBind pat grhss
+ppr_monobind (VarBind var rhs) = ppr var <+> equals <+> pprExpr (unLoc rhs)
+ppr_monobind (FunBind fun inf matches) = pprFunBind (unLoc fun) matches
-- ToDo: print infix if appropriate
-ppr_monobind sty (VarMonoBind name expr)
- = sep [ppr sty name <+> equals, nest 4 (pprExpr sty expr)]
-
-ppr_monobind sty (CoreMonoBind name expr)
- = sep [ppr sty name <+> equals, nest 4 (ppr sty expr)]
-
-ppr_monobind sty (AbsBinds tyvars dictvars exports val_binds)
- = ($$) (sep [ptext SLIT("AbsBinds"),
- brackets (interpp'SP sty tyvars),
- brackets (interpp'SP sty dictvars),
- brackets (interpp'SP sty exports)])
- (nest 4 (ppr sty val_binds))
+ppr_monobind (AbsBinds tyvars dictvars exports inlines val_binds)
+ = sep [ptext SLIT("AbsBinds"),
+ brackets (interpp'SP tyvars),
+ brackets (interpp'SP dictvars),
+ brackets (sep (punctuate comma (map ppr exports))),
+ brackets (interpp'SP (nameSetToList inlines))]
+ $$
+ nest 4 ( vcat [pprBndr LetBind x | (_,x,_) <- exports]
+ -- Print type signatures
+ $$
+ ppr val_binds )
\end{code}
%************************************************************************
serves for both.
\begin{code}
+type LSig name = Located (Sig name)
+
data Sig name
- = Sig name -- a bog-std type signature
- (HsType name)
- SrcLoc
-
- | ClassOpSig name -- Selector name
- (Maybe name) -- Default-method name (if any)
- (HsType name)
- SrcLoc
-
- | SpecSig name -- specialise a function or datatype ...
- (HsType name) -- ... to these types
- (Maybe name) -- ... maybe using this as the code for it
- SrcLoc
-
- | InlineSig name -- INLINE f
- SrcLoc
-
- | MagicUnfoldingSig
- name -- Associate the "name"d function with
- FAST_STRING -- the compiler-builtin unfolding (known
- SrcLoc -- by the String name)
+ = Sig (Located name) -- a bog-std type signature
+ (LHsType name)
+
+ | SpecSig (Located name) -- specialise a function or datatype ...
+ (LHsType name) -- ... to these types
+
+ | InlineSig Bool -- True <=> INLINE f, False <=> NOINLINE f
+ (Located name) -- Function name
+ Activation -- When inlining is *active*
+
+ | SpecInstSig (LHsType name) -- (Class tys); should be a specialisation of the
+ -- current instance decl
+
+ | FixSig (FixitySig name) -- Fixity declaration
+
+type LFixitySig name = Located (FixitySig name)
+data FixitySig name = FixitySig (Located name) Fixity
\end{code}
\begin{code}
-instance (NamedThing name, Outputable name) => Outputable (Sig name) where
- ppr sty sig = pprQuote sty (\ sty -> ppr_sig sty sig)
+okBindSig :: NameSet -> LSig Name -> Bool
+okBindSig ns sig = sigForThisGroup ns sig
+
+okClsDclSig :: LSig Name -> Bool
+okClsDclSig (L _ (SpecInstSig _)) = False
+okClsDclSig sig = True -- All others OK
+
+okInstDclSig :: NameSet -> LSig Name -> Bool
+okInstDclSig ns lsig@(L _ sig) = ok ns sig
+ where
+ ok ns (Sig _ _) = 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 -> n `elemNameSet` ns
+
+sigName :: LSig name -> Maybe name
+sigName (L _ sig) = f sig
+ where
+ f (Sig 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
+
+isFixitySig :: Sig name -> Bool
+isFixitySig (FixSig _) = True
+isFixitySig _ = False
+
+isPragSig :: Sig name -> Bool
+ -- Identifies pragmas
+isPragSig (SpecSig _ _) = True
+isPragSig (InlineSig _ _ _) = True
+isPragSig (SpecInstSig _) = True
+isPragSig other = False
+
+hsSigDoc (Sig _ _) = ptext SLIT("type signature")
+hsSigDoc (SpecSig _ _) = ptext SLIT("SPECIALISE pragma")
+hsSigDoc (InlineSig True _ _) = ptext SLIT("INLINE pragma")
+hsSigDoc (InlineSig False _ _) = ptext SLIT("NOINLINE pragma")
+hsSigDoc (SpecInstSig _) = ptext SLIT("SPECIALISE instance pragma")
+hsSigDoc (FixSig (FixitySig _ _)) = ptext SLIT("fixity declaration")
+\end{code}
+
+Signature equality is used when checking for duplicate signatures
+\begin{code}
+eqHsSig :: Sig Name -> Sig Name -> Bool
+eqHsSig (FixSig (FixitySig n1 _)) (FixSig (FixitySig n2 _)) = unLoc n1 == unLoc n2
+eqHsSig (Sig n1 _) (Sig n2 _) = unLoc n1 == unLoc n2
+eqHsSig (InlineSig b1 n1 _) (InlineSig b2 n2 _) = b1 == b2 && 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}
-ppr_sig sty (Sig var ty _)
- = sep [ppr sty var <+> ptext SLIT("::"),
- nest 4 (ppr sty ty)]
+\begin{code}
+instance (OutputableBndr name) => Outputable (Sig name) where
+ ppr sig = ppr_sig sig
-ppr_sig sty (ClassOpSig var _ ty _)
- = sep [ppr sty (getOccName var) <+> ptext SLIT("::"),
- nest 4 (ppr sty ty)]
+ppr_sig :: OutputableBndr name => Sig name -> SDoc
+ppr_sig (Sig var ty)
+ = sep [ppr var <+> dcolon, nest 4 (ppr ty)]
-ppr_sig sty (SpecSig var ty using _)
- = sep [ hsep [text "{-# SPECIALIZE", ppr sty var, ptext SLIT("::")],
- nest 4 (hsep [ppr sty ty, pp_using using, text "#-}"])
+ppr_sig (SpecSig var ty)
+ = sep [ hsep [text "{-# SPECIALIZE", ppr var, dcolon],
+ nest 4 (ppr ty <+> text "#-}")
]
- where
- pp_using Nothing = empty
- pp_using (Just me) = hsep [char '=', ppr sty me]
-ppr_sig sty (InlineSig var _)
- = hsep [text "{-# INLINE", ppr sty var, text "#-}"]
+ppr_sig (InlineSig True var phase)
+ = hsep [text "{-# INLINE", ppr phase, ppr var, text "#-}"]
-ppr_sig sty (MagicUnfoldingSig var str _)
- = hsep [text "{-# MAGIC_UNFOLDING", ppr sty var, ptext str, text "#-}"]
-\end{code}
+ppr_sig (InlineSig False var phase)
+ = hsep [text "{-# NOINLINE", ppr phase, ppr var, text "#-}"]
+ppr_sig (SpecInstSig ty)
+ = hsep [text "{-# SPECIALIZE instance", ppr ty, text "#-}"]
+
+ppr_sig (FixSig fix_sig) = ppr fix_sig
+
+instance Outputable name => Outputable (FixitySig name) where
+ ppr (FixitySig name fixity) = sep [ppr fixity, ppr name]
+\end{code}
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