import HsTypes ( LHsType, PostTcType )
import Name ( Name )
-import NameSet ( NameSet, elemNameSet, nameSetToList )
+import NameSet ( NameSet, elemNameSet )
import BasicTypes ( IPName, RecFlag(..), Activation(..), Fixity )
import Outputable
import SrcLoc ( Located(..), unLoc )
-import Var ( TyVar )
-import Bag ( Bag, emptyBag, isEmptyBag, bagToList )
+import Var ( TyVar, DictId, Id )
+import Bag ( Bag, emptyBag, isEmptyBag, bagToList, unionBags )
\end{code}
%************************************************************************
Global bindings (where clauses)
\begin{code}
-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))
- -- *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.
- ]
- where
- 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)
+data HsLocalBinds id -- Bindings in a 'let' expression
+ -- or a 'where' clause
+ = HsValBinds (HsValBinds id)
+ | HsIPBinds (HsIPBinds id)
+ | EmptyLocalBinds
--- -----------------------------------------------------------------------------
--- Implicit parameter bindings
-
-type LIPBind id = Located (IPBind id)
-
--- | Implicit parameter bindings.
-data IPBind id
- = IPBind
- (IPName id)
- (LHsExpr id)
+data HsValBinds id -- Value bindings (not implicit parameters)
+ = ValBindsIn -- Before typechecking
+ (LHsBinds id) [LSig id] -- Not dependency analysed
+ -- Recursive by default
-instance (OutputableBndr id) => Outputable (IPBind id) where
- ppr (IPBind id rhs) = pprBndr LetBind id <+> equals <+> pprExpr (unLoc rhs)
+ | ValBindsOut -- After typechecking
+ [(RecFlag, LHsBinds id)] -- Dependency analysed
--- -----------------------------------------------------------------------------
type LHsBinds id = Bag (LHsBind id)
type DictBinds id = LHsBinds id -- Used for dictionary or method bindings
type LHsBind id = Located (HsBind id)
-emptyLHsBinds :: LHsBinds id
-emptyLHsBinds = emptyBag
-
-isEmptyLHsBinds :: LHsBinds id -> Bool
-isEmptyLHsBinds = isEmptyBag
-
-pprLHsBinds :: OutputableBndr id => LHsBinds id -> SDoc
-pprLHsBinds binds
- | isEmptyLHsBinds binds = empty
- | otherwise = lbrace <+> vcat (map ppr (bagToList binds)) <+> rbrace
-
data HsBind id
= FunBind (Located id)
-- Used for both functions f x = e
-- change e.g. rnMethodBinds
Bool -- True => infix declaration
(MatchGroup id)
+ 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 (LPat id) -- The pattern is never a simple variable;
-- That case is done by FunBind
(GRHSs id)
PostTcType -- Type of the GRHSs
-
- | 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.
+ NameSet -- Same as for FunBind
+
+ | VarBind id (Located (HsExpr id)) -- Dictionary binding and suchlike
+ -- All VarBinds are introduced by the type checker
+ -- Located only for consistency
+
+ | AbsBinds -- Binds abstraction; TRANSLATION
+ [TyVar] -- Type variables
+ [DictId] -- Dicts
+ [([TyVar], id, id, [Prag])] -- (tvs, poly_id, mono_id, prags)
+ (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.)
+
+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)
+ = vcat [vcat (map ppr sigs),
+ vcat (map ppr (bagToList binds))
+ -- *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.
+ ]
+ ppr (ValBindsOut sccs) = vcat (map ppr_scc sccs)
+ where
+ ppr_scc (rec_flag, binds) = pp_rec rec_flag <+> pprLHsBinds binds
+ pp_rec Recursive = ptext SLIT("rec")
+ pp_rec NonRecursive = ptext SLIT("nonrec")
+
+pprLHsBinds :: OutputableBndr id => LHsBinds id -> SDoc
+pprLHsBinds binds
+ | isEmptyLHsBinds binds = empty
+ | otherwise = lbrace <+> vcat (map ppr (bagToList binds)) <+> rbrace
+
+------------
+emptyLocalBinds :: HsLocalBinds a
+emptyLocalBinds = EmptyLocalBinds
+
+isEmptyLocalBinds :: HsLocalBinds a -> Bool
+isEmptyLocalBinds (HsValBinds ds) = isEmptyValBinds ds
+isEmptyLocalBinds (HsIPBinds ds) = isEmptyIPBinds ds
+isEmptyLocalBinds EmptyLocalBinds = True
+
+isEmptyValBinds :: HsValBinds a -> Bool
+isEmptyValBinds (ValBindsIn ds sigs) = isEmptyLHsBinds ds && null sigs
+isEmptyValBinds (ValBindsOut ds) = null ds
+
+emptyValBindsIn, emptyValBindsOut :: HsValBinds a
+emptyValBindsIn = ValBindsIn emptyBag []
+emptyValBindsOut = ValBindsOut []
+
+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) (ValBindsOut ds2)
+ = ValBindsOut (ds1 ++ ds2)
\end{code}
What AbsBinds means
ppr_monobind :: OutputableBndr id => HsBind id -> SDoc
-ppr_monobind (PatBind pat grhss ty) = pprPatBind pat grhss
-ppr_monobind (VarBind var rhs) = ppr var <+> equals <+> pprExpr (unLoc rhs)
-ppr_monobind (FunBind fun inf matches) = pprFunBind (unLoc 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 (AbsBinds tyvars dictvars exports inlines val_binds)
+ppr_monobind (AbsBinds tyvars dictvars exports 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))]
+ brackets (sep (punctuate comma (map ppr_exp exports)))]
$$
- nest 4 ( vcat [pprBndr LetBind x | (_,x,_) <- exports]
+ nest 2 ( vcat [pprBndr LetBind x | (_,x,_,_) <- exports]
-- Print type signatures
- $$
- pprLHsBinds val_binds )
+ $$ pprLHsBinds val_binds )
+ where
+ ppr_exp (tvs, gbl, lcl, prags)
+ = vcat [ppr gbl <+> ptext SLIT("<=") <+> ppr tvs <+> ppr lcl,
+ nest 2 (vcat (map (pprPrag gbl) prags))]
\end{code}
%************************************************************************
%* *
+ Implicit parameter bindings
+%* *
+%************************************************************************
+
+\begin{code}
+data HsIPBinds id
+ = IPBinds
+ [LIPBind id]
+ (DictBinds id) -- Only in typechecker output; binds
+ -- uses of the implicit parameters
+
+isEmptyIPBinds :: HsIPBinds id -> Bool
+isEmptyIPBinds (IPBinds is ds) = null is && isEmptyBag ds
+
+type LIPBind id = Located (IPBind id)
+
+-- | Implicit parameter bindings.
+data IPBind id
+ = IPBind
+ (IPName id)
+ (LHsExpr id)
+
+instance (OutputableBndr id) => Outputable (HsIPBinds id) where
+ ppr (IPBinds bs ds) = vcat (map ppr bs)
+ $$ pprLHsBinds ds
+
+instance (OutputableBndr id) => Outputable (IPBind id) where
+ ppr (IPBind id rhs) = pprBndr LetBind id <+> equals <+> pprExpr (unLoc rhs)
+\end{code}
+
+
+%************************************************************************
+%* *
\subsection{@Sig@: type signatures and value-modifying user pragmas}
%* *
%************************************************************************
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
+ Bool -- True <=> INLINE, False <=> NOINLINE
+ Activation
+
+ | SpecPrag
+ (HsExpr Id) -- An expression, of the given specialised type, which
+ PostTcType -- specialises the polymorphic function
+ [Id] -- Dicts mentioned free in the expression
+
+isInlinePrag (InlinePrag _ _) = True
+isInlinePrag prag = False
+
+isSpecPrag (SpecPrag _ _ _) = True
+isSpecPrag prag = False
\end{code}
\begin{code}
okBindSig :: NameSet -> LSig Name -> Bool
okBindSig ns sig = sigForThisGroup ns sig
+okHsBootSig :: LSig Name -> Bool
+okHsBootSig (L _ (Sig _ _)) = True
+okHsBootSig (L _ (FixSig _)) = True
+okHsBootSig sig = False
+
okClsDclSig :: LSig Name -> Bool
okClsDclSig (L _ (SpecInstSig _)) = False
okClsDclSig sig = True -- All others OK
isVanillaLSig (L _(Sig name _)) = True
isVanillaLSig sig = False
+isSpecLSig :: LSig name -> Bool
+isSpecLSig (L _(SpecSig name _)) = True
+isSpecLSig sig = False
+
+isSpecInstLSig (L _ (SpecInstSig _)) = True
+isSpecInstLSig sig = False
+
isPragLSig :: LSig name -> Bool
-- Identifies pragmas
isPragLSig (L _ (SpecSig _ _)) = True
isPragLSig (L _ (InlineSig _ _ _)) = True
-isPragLSig (L _ (SpecInstSig _)) = True
isPragLSig other = False
hsSigDoc (Sig _ _) = ptext SLIT("type signature")
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
+eqHsSig :: LSig Name -> LSig Name -> Bool
+eqHsSig (L _ (FixSig (FixitySig n1 _))) (L _ (FixSig (FixitySig n2 _))) = unLoc n1 == unLoc n2
+eqHsSig (L _ (Sig n1 _)) (L _ (Sig n2 _)) = unLoc n1 == unLoc n2
+eqHsSig (L _ (InlineSig b1 n1 _)) (L _ (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
ppr sig = ppr_sig sig
ppr_sig :: OutputableBndr name => Sig name -> SDoc
-ppr_sig (Sig var ty)
- = sep [ppr var <+> dcolon, nest 4 (ppr ty)]
+ppr_sig (Sig var ty) = pprVarSig (unLoc var) ty
+ppr_sig (FixSig fix_sig) = ppr fix_sig
+ppr_sig (SpecSig var ty) = pragBrackets (pprSpec var ty)
+ppr_sig (InlineSig inl var phase) = pragBrackets (pprInline var inl phase)
+ppr_sig (SpecInstSig ty) = pragBrackets (ptext SLIT("SPECIALIZE instance") <+> ppr ty)
-ppr_sig (SpecSig var ty)
- = sep [ hsep [text "{-# SPECIALIZE", ppr var, dcolon],
- nest 4 (ppr ty <+> text "#-}")
- ]
+instance Outputable name => Outputable (FixitySig name) where
+ ppr (FixitySig name fixity) = sep [ppr fixity, ppr name]
-ppr_sig (InlineSig True var phase)
- = hsep [text "{-# INLINE", ppr phase, ppr var, text "#-}"]
+pragBrackets :: SDoc -> SDoc
+pragBrackets doc = ptext SLIT("{-#") <+> doc <+> ptext SLIT("#-}")
-ppr_sig (InlineSig False var phase)
- = hsep [text "{-# NOINLINE", ppr phase, ppr var, text "#-}"]
+pprInline :: Outputable id => id -> Bool -> Activation -> SDoc
+pprInline var True phase = hsep [ptext SLIT("INLINE"), ppr phase, ppr var]
+pprInline var False phase = hsep [ptext SLIT("NOINLINE"), ppr phase, ppr var]
-ppr_sig (SpecInstSig ty)
- = hsep [text "{-# SPECIALIZE instance", ppr ty, text "#-}"]
+pprVarSig :: (Outputable id, Outputable ty) => id -> ty -> SDoc
+pprVarSig var ty = sep [ppr var <+> dcolon, nest 2 (ppr ty)]
-ppr_sig (FixSig fix_sig) = ppr fix_sig
+pprSpec :: (Outputable id, Outputable ty) => id -> ty -> SDoc
+pprSpec var ty = sep [ptext SLIT("SPECIALIZE") <+> pprVarSig var ty]
-instance Outputable name => Outputable (FixitySig name) where
- ppr (FixitySig name fixity) = sep [ppr fixity, ppr name]
+pprPrag :: Outputable id => id -> Prag -> SDoc
+pprPrag var (InlinePrag inl act) = pprInline var inl act
+pprPrag var (SpecPrag expr ty _) = pprSpec var ty
\end{code}
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