%
\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,
+ LMatch, pprFunBind,
+ GRHSs, pprPatBind )
-- friends:
-import HsTypes ( HsType )
-import CoreSyn ( CoreExpr )
-import PprCore () -- Instances for Outputable
+import HsPat ( LPat )
+import HsTypes ( LHsType )
--others:
-import Id ( Id )
-import NameSet ( NameSet, nameSetToList )
-import BasicTypes ( RecFlag(..), Fixity )
+import Name ( Name )
+import NameSet ( NameSet, elemNameSet, nameSetToList )
+import BasicTypes ( IPName, RecFlag(..), Activation(..), Fixity )
import Outputable
-import Bag
-import SrcLoc ( SrcLoc )
+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 id pat -- binders and bindees
- = EmptyBinds
-
- | ThenBinds (HsBinds id pat)
- (HsBinds id pat)
-
- | MonoBind (MonoBinds id pat)
- [Sig id] -- Empty on typechecker output
- RecFlag
-\end{code}
-
-\begin{code}
-nullBinds :: HsBinds 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, 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),
+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),
- ppr bind
+ vcat (map ppr (bagToList binds))
]
where
- rec_str = case is_rec of
- Recursive -> SLIT("{- rec -}")
- NonRecursive -> SLIT("{- nonrec -}")
-\end{code}
-
-%************************************************************************
-%* *
-\subsection{Bindings: @MonoBinds@}
-%* *
-%************************************************************************
-
-Global bindings (where clauses)
-
-\begin{code}
-data MonoBinds id pat
- = EmptyMonoBinds
-
- | AndMonoBinds (MonoBinds id pat)
- (MonoBinds id pat)
-
- | PatMonoBind pat
- (GRHSs id pat)
- SrcLoc
-
- | FunMonoBind id
- Bool -- True => infix declaration
- [Match id pat]
- SrcLoc
-
- | VarMonoBind id -- TRANSLATION
- (HsExpr id pat)
-
- | CoreMonoBind id -- TRANSLATION
- CoreExpr -- No zonking; this is a final CoreExpr with Ids and Types!
+ 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
- (MonoBinds id pat) -- The "business end"
+ (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)
-
-\begin{code}
-nullMonoBinds :: MonoBinds id pat -> Bool
-
-nullMonoBinds EmptyMonoBinds = True
-nullMonoBinds (AndMonoBinds bs1 bs2) = nullMonoBinds bs1 && nullMonoBinds bs2
-nullMonoBinds other_monobind = False
-
-andMonoBinds :: MonoBinds id pat -> MonoBinds id pat -> MonoBinds id pat
-andMonoBinds EmptyMonoBinds mb = mb
-andMonoBinds mb EmptyMonoBinds = mb
-andMonoBinds mb1 mb2 = AndMonoBinds mb1 mb2
-
-andMonoBindList :: [MonoBinds id pat] -> MonoBinds id pat
-andMonoBindList binds = foldr AndMonoBinds EmptyMonoBinds binds
-\end{code}
+ tp = /\ [a,b] -> \ [d1,d2] -> letrec DBINDS and BIND
+ in (fm,gm)
\begin{code}
-instance (Outputable id, Outputable pat) =>
- Outputable (MonoBinds id pat) where
+instance OutputableBndr id => Outputable (HsBind id) where
ppr mbind = ppr_monobind mbind
+ppr_monobind :: OutputableBndr id => HsBind id -> SDoc
-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
-
-ppr_monobind (PatMonoBind pat grhss locn)
- = sep [ppr pat, nest 4 (pprGRHSs False grhss)]
-
-ppr_monobind (FunMonoBind fun inf matches locn)
- = pprMatches (False, ppr 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 (VarMonoBind name expr)
- = sep [ppr name <+> equals, nest 4 (pprExpr expr)]
-
-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 (sep (punctuate comma (map ppr exports))),
brackets (interpp'SP (nameSetToList inlines))]
$$
- nest 4 (ppr val_binds)
+ nest 4 ( vcat [pprBndr LetBind x | (_,x,_) <- exports]
+ -- Print type signatures
+ $$
+ ppr val_binds )
\end{code}
%************************************************************************
serves for both.
\begin{code}
-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
+type LSig name = Located (Sig name)
- | SpecSig name -- specialise a function or datatype ...
- (HsType name) -- ... to these types
- SrcLoc
+data Sig name
+ = Sig (Located name) -- a bog-std type signature
+ (LHsType name)
- | InlineSig name -- INLINE f
- SrcLoc
+ | SpecSig (Located name) -- specialise a function or datatype ...
+ (LHsType name) -- ... to these types
- | NoInlineSig name -- NOINLINE f
- SrcLoc
+ | InlineSig Bool -- True <=> INLINE f, False <=> NOINLINE f
+ (Located name) -- Function name
+ Activation -- When inlining is *active*
- | 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
+ | FixSig (FixitySig name) -- Fixity declaration
-data FixitySig name = FixitySig name Fixity SrcLoc
+type LFixitySig name = Located (FixitySig name)
+data FixitySig name = FixitySig (Located name) Fixity
\end{code}
\begin{code}
-sigsForMe :: (name -> Bool) -> [Sig name] -> [Sig name]
-sigsForMe f sigs
- = filter sig_for_me sigs
+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
- sig_for_me (Sig n _ _) = f n
- sig_for_me (ClassOpSig n _ _ _) = f n
- sig_for_me (SpecSig n _ _) = f n
- sig_for_me (InlineSig n _) = f n
- sig_for_me (NoInlineSig n _) = f n
- sig_for_me (SpecInstSig _ _) = False
- sig_for_me (FixSig (FixitySig n _ _)) = f n
+ 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
-isClassOpSig :: Sig name -> Bool
-isClassOpSig (ClassOpSig _ _ _ _) = True
-isClassOpSig _ = 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}
-\begin{code}
-instance (Outputable name) => Outputable (Sig name) where
- ppr sig = ppr_sig sig
-
-instance Outputable name => Outputable (FixitySig name) where
- ppr (FixitySig name fixity loc) = sep [ppr fixity, ppr name]
+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 (Sig var ty _)
- = sep [ppr var <+> dcolon, nest 4 (ppr ty)]
+\begin{code}
+instance (OutputableBndr name) => Outputable (Sig name) where
+ ppr sig = ppr_sig sig
-ppr_sig (ClassOpSig var _ ty _)
+ppr_sig :: OutputableBndr name => Sig name -> SDoc
+ppr_sig (Sig var ty)
= sep [ppr var <+> dcolon, nest 4 (ppr ty)]
-ppr_sig (SpecSig var ty _)
+ppr_sig (SpecSig var ty)
= sep [ hsep [text "{-# SPECIALIZE", ppr var, dcolon],
nest 4 (ppr ty <+> text "#-}")
]
-ppr_sig (InlineSig var _)
- = hsep [text "{-# INLINE", ppr var, text "#-}"]
+ppr_sig (InlineSig True var phase)
+ = hsep [text "{-# INLINE", ppr phase, ppr var, text "#-}"]
-ppr_sig (NoInlineSig var _)
- = hsep [text "{-# NOINLINE", ppr var, text "#-}"]
+ppr_sig (InlineSig False var phase)
+ = hsep [text "{-# NOINLINE", ppr phase, ppr var, text "#-}"]
-ppr_sig (SpecInstSig ty _)
+ppr_sig (SpecInstSig ty)
= hsep [text "{-# SPECIALIZE instance", ppr ty, text "#-}"]
ppr_sig (FixSig fix_sig) = ppr fix_sig
-\end{code}
+instance Outputable name => Outputable (FixitySig name) where
+ ppr (FixitySig name fixity) = sep [ppr fixity, ppr name]
+\end{code}
projects / ghc-hetmet.git / blobdiff