%
-% (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@.
\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,
+ Match, pprFunBind,
+ GRHSs, pprPatBind )
-import HsPragmas ( GenPragmas, ClassOpPragmas )
+-- friends:
+import HsImpExp ( pprHsVar )
+import HsPat ( Pat )
import HsTypes ( HsType )
-import CoreSyn ( SYN_IE(CoreExpr) )
+import CoreSyn ( CoreExpr )
+import PprCore ( {- instance Outputable (Expr a) -} )
--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 PrelNames ( isUnboundName )
+import NameSet ( NameSet, elemNameSet, nameSetToList )
+import BasicTypes ( RecFlag(..), FixitySig(..), Activation(..) )
+import Outputable
+import SrcLoc ( SrcLoc )
+import Var ( TyVar )
+import Class ( DefMeth (..) )
\end{code}
%************************************************************************
Collections of bindings, created by dependency analysis and translation:
\begin{code}
-data HsBinds tyvar uvar id pat -- binders and bindees
+data HsBinds id -- binders and bindees
= EmptyBinds
- | ThenBinds (HsBinds tyvar uvar id pat)
- (HsBinds tyvar uvar id pat)
+ | ThenBinds (HsBinds id)
+ (HsBinds id)
- | MonoBind (MonoBinds tyvar uvar id pat)
- [Sig id] -- Empty on typechecker output
+ | MonoBind (MonoBinds id)
+ [Sig id] -- Empty on typechecker output, Type Signatures
RecFlag
-
-type RecFlag = Bool
-recursive = True
-nonRecursive = False
\end{code}
\begin{code}
-nullBinds :: HsBinds tyvar uvar id pat -> Bool
+nullBinds :: HsBinds id -> Bool
nullBinds EmptyBinds = True
nullBinds (ThenBinds b1 b2) = nullBinds b1 && nullBinds b2
nullBinds (MonoBind b _ _) = nullMonoBinds b
+
+mkMonoBind :: MonoBinds id -> [Sig id] -> RecFlag -> HsBinds id
+mkMonoBind EmptyMonoBinds _ _ = EmptyBinds
+mkMonoBind mbinds sigs is_rec = MonoBind mbinds sigs is_rec
\end{code}
\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)
- = ($$) (ppr_binds sty binds1) (ppr_binds sty binds2)
-ppr_binds sty (MonoBind bind sigs is_rec)
- = vcat [
- ifnotPprForUser sty (ptext rec_str),
- if null sigs
- then empty
- else vcat (map (ppr sty) sigs),
- ppr sty bind
+instance (OutputableBndr id) => Outputable (HsBinds id) where
+ ppr binds = ppr_binds binds
+
+ppr_binds EmptyBinds = empty
+ppr_binds (ThenBinds binds1 binds2)
+ = ppr_binds binds1 $$ ppr_binds binds2
+ppr_binds (MonoBind bind sigs is_rec)
+ = vcat [ppr_isrec,
+ vcat (map ppr sigs),
+ ppr bind
]
where
- rec_str | is_rec = SLIT("{- rec -}")
- | otherwise = SLIT("{- nonrec -}")
+ ppr_isrec = getPprStyle $ \ sty ->
+ if userStyle sty then empty else
+ case is_rec of
+ Recursive -> ptext SLIT("{- rec -}")
+ NonRecursive -> ptext SLIT("{- nonrec -}")
\end{code}
%************************************************************************
Global bindings (where clauses)
\begin{code}
-data MonoBinds tyvar uvar id pat
+data MonoBinds id
= EmptyMonoBinds
- | AndMonoBinds (MonoBinds tyvar uvar id pat)
- (MonoBinds tyvar uvar id pat)
-
- | PatMonoBind pat
- (GRHSsAndBinds tyvar uvar id pat)
+ | AndMonoBinds (MonoBinds id)
+ (MonoBinds id)
+
+ | 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...
+ --
+ -- This also means that instance decls can only have
+ -- FunMonoBinds, so if you change this, you'll need to
+ -- change e.g. rnMethodBinds
+ Bool -- True => infix declaration
+ [Match id]
SrcLoc
- | FunMonoBind id
- Bool -- True => infix declaration
- [Match tyvar uvar id pat] -- must have at least one Match
+ | PatMonoBind (Pat id) -- The pattern is never a simple variable;
+ -- That case is done by FunMonoBind
+ (GRHSs id)
SrcLoc
| VarMonoBind id -- TRANSLATION
- (HsExpr tyvar uvar id pat)
-
- | CoreMonoBind id -- TRANSLATION
- CoreExpr -- No zonking; this is a final CoreExpr with Ids and Types!
+ (HsExpr id)
- | 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"
+ | 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) -- 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
+-- We keep the invariant that a MonoBinds is only empty
+-- if it is exactly EmptyMonoBinds
+nullMonoBinds :: MonoBinds id -> Bool
nullMonoBinds EmptyMonoBinds = True
-nullMonoBinds (AndMonoBinds bs1 bs2) = nullMonoBinds bs1 && nullMonoBinds bs2
nullMonoBinds other_monobind = False
-andMonoBinds :: [MonoBinds tyvar uvar id pat] -> MonoBinds tyvar uvar id pat
-andMonoBinds binds = foldr AndMonoBinds EmptyMonoBinds binds
+andMonoBinds :: MonoBinds id -> MonoBinds id -> MonoBinds id
+andMonoBinds EmptyMonoBinds mb = mb
+andMonoBinds mb EmptyMonoBinds = mb
+andMonoBinds mb1 mb2 = AndMonoBinds mb1 mb2
+
+andMonoBindList :: [MonoBinds id] -> MonoBinds id
+andMonoBindList binds
+ = loop1 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
\end{code}
-\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)
+\begin{code}
+instance OutputableBndr id => Outputable (MonoBinds id) where
+ ppr mbind = ppr_monobind mbind
-ppr_monobind sty EmptyMonoBinds = empty
-ppr_monobind sty (AndMonoBinds binds1 binds2)
- = ($$) (ppr_monobind sty binds1) (ppr_monobind sty binds2)
-ppr_monobind sty (PatMonoBind pat grhss_n_binds locn)
- = sep [ppr sty pat, nest 4 (pprGRHSsAndBinds sty False grhss_n_binds)]
+ppr_monobind :: OutputableBndr id => MonoBinds id -> SDoc
+ppr_monobind EmptyMonoBinds = empty
+ppr_monobind (AndMonoBinds binds1 binds2)
+ = ppr_monobind binds1 $$ ppr_monobind binds2
-ppr_monobind sty (FunMonoBind fun inf matches locn)
- = pprMatches sty (False, ppr sty fun) matches
+ppr_monobind (PatMonoBind pat grhss locn) = pprPatBind pat grhss
+ppr_monobind (FunMonoBind fun inf matches locn) = pprFunBind 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)
- = ($$) (sep [ptext SLIT("AbsBinds"),
- brackets (interpp'SP sty tyvars),
- brackets (interpp'SP sty dictvars),
- brackets (interpp'SP sty exports)])
- (nest 4 (ppr sty val_binds))
+ppr_monobind (VarMonoBind name expr)
+ = sep [pprBndr LetBind name <+> equals, nest 4 (pprExpr expr)]
+
+ppr_monobind (AbsBinds tyvars dictvars exports inlines val_binds)
+ = sep [ptext SLIT("AbsBinds"),
+ brackets (interpp'SP tyvars),
+ brackets (interpp'SP dictvars),
+ brackets (sep (punctuate comma (map ppr exports))),
+ brackets (interpp'SP (nameSetToList inlines))]
+ $$
+ nest 4 ( vcat [pprBndr LetBind x | (_,x,_) <- exports]
+ -- Print type signatures
+ $$
+ ppr val_binds )
\end{code}
%************************************************************************
(HsType name)
SrcLoc
- | ClassOpSig name -- Selector name
- (Maybe name) -- Default-method name (if any)
+ | ClassOpSig name -- Selector name
+ (DefMeth name) -- Default-method info
+ -- See "THE NAMING STORY" in HsDecls
(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
+ (HsType name) -- ... to these types
+ SrcLoc
+
+ | InlineSig Bool -- True <=> INLINE f, False <=> NOINLINE f
+ name -- Function name
+ Activation -- When inlining is *active*
SrcLoc
- | InlineSig name -- INLINE f
+ | SpecInstSig (HsType name) -- (Class tys); should be a specialisation of the
+ -- current instance decl
SrcLoc
- | MagicUnfoldingSig
- name -- Associate the "name"d function with
- FAST_STRING -- the compiler-builtin unfolding (known
- SrcLoc -- by the String name)
+ | FixSig (FixitySig name) -- Fixity declaration
\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 -> Sig Name -> Bool
+okBindSig ns (ClassOpSig _ _ _ _) = False
+okBindSig ns sig = sigForThisGroup ns sig
+
+okClsDclSig :: NameSet -> Sig Name -> Bool
+okClsDclSig ns (Sig _ _ _) = False
+okClsDclSig ns sig = sigForThisGroup ns sig
+
+okInstDclSig :: NameSet -> Sig Name -> Bool
+okInstDclSig ns (Sig _ _ _) = False
+okInstDclSig ns (FixSig _) = False
+okInstDclSig ns (SpecInstSig _ _) = True
+okInstDclSig ns sig = sigForThisGroup ns sig
+
+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 (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
+ -- Identifies pragmas
+isPragSig (SpecSig _ _ _) = True
+isPragSig (InlineSig _ _ _ _) = True
+isPragSig (SpecInstSig _ _) = True
+isPragSig other = False
+\end{code}
+\begin{code}
+hsSigDoc (Sig _ _ loc) = (ptext SLIT("type signature"),loc)
+hsSigDoc (ClassOpSig _ _ _ loc) = (ptext SLIT("class-method type signature"), loc)
+hsSigDoc (SpecSig _ _ loc) = (ptext SLIT("SPECIALISE pragma"),loc)
+hsSigDoc (InlineSig True _ _ loc) = (ptext SLIT("INLINE pragma"),loc)
+hsSigDoc (InlineSig False _ _ loc) = (ptext SLIT("NOINLINE pragma"),loc)
+hsSigDoc (SpecInstSig _ loc) = (ptext SLIT("SPECIALISE instance pragma"),loc)
+hsSigDoc (FixSig (FixitySig _ _ loc)) = (ptext SLIT("fixity declaration"), loc)
+\end{code}
-ppr_sig sty (Sig var ty _)
- = sep [ppr sty var <+> ptext SLIT("::"),
- nest 4 (ppr sty ty)]
+\begin{code}
+instance (Outputable 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 :: Outputable 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 (ClassOpSig var dm ty _)
+ = sep [ pprHsVar var <+> dcolon,
+ nest 4 (ppr ty),
+ nest 4 (pp_dm_comment) ]
where
- pp_using Nothing = empty
- pp_using (Just me) = hsep [char '=', ppr sty me]
+ pp_dm = case dm of
+ DefMeth _ -> equals -- Default method indicator
+ GenDefMeth -> semi -- Generic method indicator
+ NoDefMeth -> empty -- No Method at all
+ pp_dm_comment = case dm of
+ DefMeth _ -> text "{- has default method -}"
+ GenDefMeth -> text "{- has generic method -}"
+ NoDefMeth -> 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 True var phase _)
+ = hsep [text "{-# INLINE", ppr phase, ppr var, text "#-}"]
-ppr_sig sty (InlineSig var _)
- = hsep [text "{-# INLINE", ppr sty var, text "#-}"]
+ppr_sig (InlineSig False var phase _)
+ = hsep [text "{-# NOINLINE", ppr phase, ppr var, text "#-}"]
-ppr_sig sty (MagicUnfoldingSig var str _)
- = hsep [text "{-# MAGIC_UNFOLDING", ppr sty var, ptext str, text "#-}"]
+ppr_sig (SpecInstSig ty _)
+ = hsep [text "{-# SPECIALIZE instance", ppr ty, text "#-}"]
+
+ppr_sig (FixSig fix_sig) = ppr fix_sig
\end{code}
+Checking for distinct signatures; oh, so boring
+
+
+\begin{code}
+eqHsSig :: Sig Name -> Sig Name -> Bool
+eqHsSig (Sig n1 _ _) (Sig n2 _ _) = n1 == n2
+eqHsSig (InlineSig b1 n1 _ _)(InlineSig b2 n2 _ _) = b1 == b2 && 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 _other1 _other2 = False
+\end{code}
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