--others:
import Id ( SYN_IE(DictVar), SYN_IE(Id), GenId )
-import Name ( pprNonSym, getOccName, OccName )
+import Name ( getOccName, OccName, NamedThing(..) )
import Outputable ( interpp'SP, ifnotPprForUser,
Outputable(..){-instance * (,)-}
)
-import PprCore ( GenCoreExpr {- instance Outputable -} )
+import PprCore --( GenCoreExpr {- instance Outputable -} )
import PprType ( GenTyVar {- instance Outputable -} )
import Pretty
import Bag
| ThenBinds (HsBinds tyvar uvar id pat)
(HsBinds tyvar uvar id pat)
- | SingleBind (Bind tyvar uvar id pat)
+ | MonoBind (MonoBinds tyvar uvar id pat)
+ [Sig id] -- Empty on typechecker output
+ RecFlag
- | BindWith -- Bind with a type signature.
- -- These appear only on typechecker input
- -- (HsType [in Sigs] can't appear on output)
- (Bind tyvar uvar id pat)
- [Sig id]
+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}
+
+\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 EmptyBinds = empty
+ ppr sty (ThenBinds binds1 binds2)
+ = ($$) (ppr sty binds1) (ppr sty binds2)
+ ppr 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
+ ]
+ 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]
- [id] -- Dicts
- [(id, id)] -- (old, new) pairs
- [(id, HsExpr tyvar uvar id pat)] -- local dictionaries
- (Bind tyvar uvar id pat) -- "the business end"
+ [tyvar] -- Type variables
+ [id] -- Dicts
+ [([tyvar], id, id)] -- (type variables, polymorphic, momonmorphic) triples
+ (MonoBinds tyvar uvar id pat) -- The "business end"
-- Creates bindings for *new* (polymorphic, overloaded) locals
-- in terms of *old* (monomorphic, non-overloaded) ones.
-- of this last construct.)
\end{code}
+What AbsBinds means
+~~~~~~~~~~~~~~~~~~~
+ AbsBinds tvs
+ [d1,d2]
+ [(tvs1, f1p, f1m),
+ (tvs2, f2p, f2m)]
+ BIND
+means
+
+ f1p = /\ tvs -> \ [d1,d2] -> letrec DBINDS and BIND
+ in fm
+
+ gp = ...same again, with gm instead of fm
+
+This is a pretty bad translation, because it duplicates all the bindings.
+So the desugarer tries to do a better job:
+
+ fp = /\ [a,b] -> \ [d1,d2] -> case tp [a,b] [d1,d2] of
+ (fm,gm) -> fm
+ ..ditto for gp..
+
+ p = /\ [a,b] -> \ [d1,d2] -> letrec DBINDS and BIND
+ in (fm,gm)
+
\begin{code}
-nullBinds :: HsBinds tyvar uvar id pat -> Bool
+nullMonoBinds :: MonoBinds tyvar uvar id pat -> Bool
-nullBinds EmptyBinds = True
-nullBinds (ThenBinds b1 b2) = nullBinds b1 && nullBinds b2
-nullBinds (SingleBind b) = nullBind b
-nullBinds (BindWith b _) = nullBind b
-nullBinds (AbsBinds _ _ _ ds b) = null ds && nullBind b
+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
\end{code}
\begin{code}
-instance (Outputable pat, NamedThing id, Outputable id,
+instance (NamedThing id, Outputable id, Outputable pat,
Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) =>
- Outputable (HsBinds tyvar uvar id pat) where
+ Outputable (MonoBinds tyvar uvar id pat) where
+ ppr sty EmptyMonoBinds = empty
+ ppr sty (AndMonoBinds binds1 binds2)
+ = ($$) (ppr sty binds1) (ppr sty binds2)
- ppr sty EmptyBinds = ppNil
- ppr sty (ThenBinds binds1 binds2)
- = ppAbove (ppr sty binds1) (ppr sty binds2)
- ppr sty (SingleBind bind) = ppr sty bind
- ppr sty (BindWith bind sigs)
- = ppAbove (if null sigs
- then ppNil
- else ppAboves (map (ppr sty) sigs))
- (ppr sty bind)
- ppr sty (AbsBinds tyvars dictvars local_pairs dict_binds val_binds)
- = ppAbove (ppSep [ppPStr SLIT("AbsBinds"),
- ppBesides[ppLbrack, interpp'SP sty tyvars, ppRbrack],
- ppBesides[ppLbrack, interpp'SP sty dictvars, ppRbrack],
- ppBesides[ppLbrack, interpp'SP sty local_pairs, ppRbrack]])
- (ppNest 4 (ppAbove (ppAboves (map (ppr sty) dict_binds)) (ppr sty val_binds)))
+ ppr sty (PatMonoBind pat grhss_n_binds locn)
+ = hang (ppr sty pat) 4 (pprGRHSsAndBinds sty False grhss_n_binds)
+
+ ppr sty (FunMonoBind fun inf matches locn)
+ = pprMatches sty (False, ppr sty fun) matches
+ -- ToDo: print infix if appropriate
+
+ ppr sty (VarMonoBind name expr)
+ = hang (hsep [ppr sty name, equals]) 4 (ppr sty expr)
+
+ ppr sty (CoreMonoBind name expr)
+ = hang (hsep [ppr sty name, equals]) 4 (ppr sty expr)
+
+ ppr 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))
\end{code}
%************************************************************************
(HsType name)
SrcLoc
- | ClassOpSig name -- class-op sigs have different pragmas
+ | ClassOpSig name -- Selector name
+ name -- Default-method name
(HsType name)
- (ClassOpPragmas name) -- only interface ones have pragmas
SrcLoc
| SpecSig name -- specialise a function or datatype ...
\begin{code}
instance (NamedThing name, Outputable name) => Outputable (Sig name) where
ppr sty (Sig var ty _)
- = ppHang (ppCat [pprNonSym sty var, ppPStr SLIT("::")])
+ = hang (hsep [ppr sty var, ptext SLIT("::")])
4 (ppr sty ty)
- ppr sty (ClassOpSig var ty pragmas _)
- = ppHang (ppCat [ppr sty (getOccName var), ppPStr SLIT("::")])
- 4 (ppHang (ppr sty ty)
- 4 (ifnotPprForUser sty (ppr sty pragmas)))
+ ppr sty (ClassOpSig var _ ty _)
+ = hang (hsep [ppr sty (getOccName var), ptext SLIT("::")])
+ 4 (ppr sty ty)
ppr sty (DeforestSig var _)
- = ppHang (ppCat [ppStr "{-# DEFOREST", pprNonSym sty var])
- 4 (ppStr "#-}")
+ = hang (hsep [text "{-# DEFOREST", ppr sty var])
+ 4 (text "#-")
ppr sty (SpecSig var ty using _)
- = ppHang (ppCat [ppPStr SLIT("{-# SPECIALIZE"), pprNonSym sty var, ppPStr SLIT("::")])
- 4 (ppCat [ppr sty ty, pp_using using, ppPStr SLIT("#-}")])
+ = hang (hsep [text "{-# SPECIALIZE", ppr sty var, ptext SLIT("::")])
+ 4 (hsep [ppr sty ty, pp_using using, text "#-}"])
+
where
- pp_using Nothing = ppNil
- pp_using (Just me) = ppCat [ppChar '=', ppr sty me]
+ pp_using Nothing = empty
+ pp_using (Just me) = hsep [char '=', ppr sty me]
ppr sty (InlineSig var _)
- = ppCat [ppPStr SLIT("{-# INLINE"), pprNonSym sty var, ppPStr SLIT("#-}")]
- ppr sty (MagicUnfoldingSig var str _)
- = ppCat [ppPStr SLIT("{-# MAGIC_UNFOLDING"), pprNonSym sty var, ppPStr str, ppPStr SLIT("#-}")]
-\end{code}
-
-%************************************************************************
-%* *
-\subsection{Binding: @Bind@}
-%* *
-%************************************************************************
-
-\begin{code}
-data Bind tyvar uvar id pat -- binders and bindees
- = EmptyBind -- because it's convenient when parsing signatures
- | NonRecBind (MonoBinds tyvar uvar id pat)
- | RecBind (MonoBinds tyvar uvar id pat)
-\end{code}
-
-\begin{code}
-nullBind :: Bind tyvar uvar id pat -> Bool
-
-nullBind EmptyBind = True
-nullBind (NonRecBind bs) = nullMonoBinds bs
-nullBind (RecBind bs) = nullMonoBinds bs
-\end{code}
-
-\begin{code}
-bindIsRecursive :: Bind tyvar uvar id pat -> Bool
-
-bindIsRecursive EmptyBind = False
-bindIsRecursive (NonRecBind _) = False
-bindIsRecursive (RecBind _) = True
-\end{code}
-
-\begin{code}
-instance (NamedThing id, Outputable id, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) =>
- Outputable (Bind tyvar uvar id pat) where
- ppr sty EmptyBind = ppNil
- ppr sty (NonRecBind binds)
- = ppAbove (ifnotPprForUser sty (ppStr "{- nonrec -}"))
- (ppr sty binds)
- ppr sty (RecBind binds)
- = ppAbove (ifnotPprForUser sty (ppStr "{- rec -}"))
- (ppr sty binds)
-\end{code}
-
-%************************************************************************
-%* *
-\subsection{Bindings: @MonoBinds@}
-%* *
-%************************************************************************
+ = hsep [text "{-# INLINE", ppr sty var, text "#-}"]
-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!
-\end{code}
-
-\begin{code}
-nullMonoBinds :: MonoBinds tyvar uvar id pat -> Bool
-
-nullMonoBinds EmptyMonoBinds = True
-nullMonoBinds (AndMonoBinds bs1 bs2) = nullMonoBinds bs1 && nullMonoBinds bs2
-nullMonoBinds other_monobind = False
-\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 EmptyMonoBinds = ppNil
- ppr sty (AndMonoBinds binds1 binds2)
- = ppAbove (ppr sty binds1) (ppr sty binds2)
-
- ppr sty (PatMonoBind pat grhss_n_binds locn)
- = ppHang (ppr sty pat) 4 (pprGRHSsAndBinds sty False grhss_n_binds)
-
- ppr sty (FunMonoBind fun inf matches locn)
- = pprMatches sty (False, pprNonSym sty fun) matches
- -- ToDo: print infix if appropriate
-
- ppr sty (VarMonoBind name expr)
- = ppHang (ppCat [pprNonSym sty name, ppEquals]) 4 (ppr sty expr)
-
- ppr sty (CoreMonoBind name expr)
- = ppHang (ppCat [pprNonSym sty name, ppEquals]) 4 (ppr sty expr)
+ ppr sty (MagicUnfoldingSig var str _)
+ = hsep [text "{-# MAGIC_UNFOLDING", ppr sty var, ptext str, text "#-}"]
\end{code}
%************************************************************************
\begin{code}
collectTopBinders :: HsBinds tyvar uvar name (InPat name) -> Bag (name,SrcLoc)
collectTopBinders EmptyBinds = emptyBag
-collectTopBinders (SingleBind b) = collectBinders b
-collectTopBinders (BindWith b _) = collectBinders b
+collectTopBinders (MonoBind b _ _) = collectMonoBinders b
collectTopBinders (ThenBinds b1 b2)
= collectTopBinders b1 `unionBags` collectTopBinders b2
-collectBinders :: Bind tyvar uvar name (InPat name) -> Bag (name,SrcLoc)
-collectBinders EmptyBind = emptyBag
-collectBinders (NonRecBind monobinds) = collectMonoBinders monobinds
-collectBinders (RecBind monobinds) = collectMonoBinders monobinds
-
collectMonoBinders :: MonoBinds tyvar uvar name (InPat name) -> Bag (name,SrcLoc)
collectMonoBinders EmptyMonoBinds = emptyBag
collectMonoBinders (PatMonoBind pat grhss_w_binds loc) = listToBag (map (\v->(v,loc)) (collectPatBinders pat))
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