module HsBinds where
-import Ubiq
+IMP_Ubiq()
-- friends:
-import HsLoop
-import HsMatches ( pprMatches, pprGRHSsAndBinds,
- Match, GRHSsAndBinds )
-import HsPat ( collectPatBinders, InPat )
+#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ <= 201
+IMPORT_DELOOPER(HsLoop) ( pprMatches, pprGRHSsAndBinds,
+ Match, GRHSsAndBinds,
+ pprExpr, HsExpr )
+#endif
+
import HsPragmas ( GenPragmas, ClassOpPragmas )
-import HsTypes ( PolyType )
+import HsTypes ( HsType )
+import CoreSyn ( SYN_IE(CoreExpr) )
--others:
-import Id ( DictVar(..), Id(..), GenId )
-import Outputable
+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 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
+
\end{code}
%************************************************************************
| 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
+
+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}
- | BindWith -- Bind with a type signature.
- -- These appear only on typechecker input
- -- (PolyType [in Sigs] can't appear on output)
- (Bind tyvar uvar id pat)
- [Sig id]
+\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
+ ]
+ 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 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
+ -- ToDo: print infix if appropriate
- 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_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))
\end{code}
%************************************************************************
\begin{code}
data Sig name
= Sig name -- a bog-std type signature
- (PolyType name)
- (GenPragmas name) -- only interface ones have pragmas
+ (HsType name)
SrcLoc
- | ClassOpSig name -- class-op sigs have different pragmas
- (PolyType name)
- (ClassOpPragmas name) -- only interface ones have pragmas
+ | ClassOpSig name -- Selector name
+ (Maybe name) -- Default-method name (if any)
+ (HsType name)
SrcLoc
| SpecSig name -- specialise a function or datatype ...
- (PolyType name) -- ... to these types
+ (HsType name) -- ... to these types
(Maybe name) -- ... maybe using this as the code for it
SrcLoc
| InlineSig name -- INLINE f
SrcLoc
- -- ToDo: strictly speaking, could omit based on -DOMIT_DEFORESTER
| DeforestSig name -- Deforest using this function definition
SrcLoc
\begin{code}
instance (NamedThing name, Outputable name) => Outputable (Sig name) where
- ppr sty (Sig var ty pragmas _)
- = ppHang (ppCat [pprNonOp sty var, ppPStr SLIT("::")])
- 4 (ppHang (ppr sty ty)
- 4 (ifnotPprForUser sty (ppr sty pragmas)))
-
- ppr sty (ClassOpSig var ty pragmas _)
- = ppHang (ppCat [pprNonOp sty var, ppPStr SLIT("::")])
- 4 (ppHang (ppr sty ty)
- 4 (ifnotPprForUser sty (ppr sty pragmas)))
-
- ppr sty (DeforestSig var _)
- = ppHang (ppCat [ppStr "{-# DEFOREST", pprNonOp sty var])
- 4 (ppStr "#-}")
-
- ppr sty (SpecSig var ty using _)
- = ppHang (ppCat [ppPStr SLIT("{-# SPECIALIZE"), pprNonOp sty var, ppPStr SLIT("::")])
- 4 (ppCat [ppr sty ty, pp_using using, ppPStr SLIT("#-}")])
- where
- pp_using Nothing = ppNil
- pp_using (Just me) = ppCat [ppChar '=', ppr sty me]
-
- ppr sty (InlineSig var _)
- = ppCat [ppPStr SLIT("{-# INLINE"), pprNonOp sty var, ppPStr SLIT("#-}")]
-
- ppr sty (MagicUnfoldingSig var str _)
- = ppCat [ppPStr SLIT("{-# MAGIC_UNFOLDING"), pprNonOp sty var, ppPStr str, ppPStr SLIT("#-}")]
-\end{code}
-
-%************************************************************************
-%* *
-\subsection{Binding: @Bind@}
-%* *
-%************************************************************************
+ ppr sty sig = pprQuote sty (\ sty -> ppr_sig sty sig)
-\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
+ppr_sig sty (Sig var ty _)
+ = sep [ppr sty var <+> ptext SLIT("::"),
+ nest 4 (ppr sty ty)]
-nullBind EmptyBind = True
-nullBind (NonRecBind bs) = nullMonoBinds bs
-nullBind (RecBind bs) = nullMonoBinds bs
-\end{code}
-
-\begin{code}
-bindIsRecursive :: Bind tyvar uvar id pat -> Bool
+ppr_sig sty (ClassOpSig var _ ty _)
+ = sep [ppr sty (getOccName var) <+> ptext SLIT("::"),
+ nest 4 (ppr sty ty)]
-bindIsRecursive EmptyBind = False
-bindIsRecursive (NonRecBind _) = False
-bindIsRecursive (RecBind _) = True
-\end{code}
+ppr_sig sty (DeforestSig var _)
+ = hsep [text "{-# DEFOREST", ppr sty var, text "#-}"]
-\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@}
-%* *
-%************************************************************************
-
-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
- [Match tyvar uvar id pat] -- must have at least one Match
- SrcLoc
- | VarMonoBind id -- TRANSLATION
- (HsExpr tyvar uvar id pat)
-\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_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 "#-}"])
+ ]
+ where
+ pp_using Nothing = empty
+ pp_using (Just me) = hsep [char '=', ppr sty me]
- ppr sty (FunMonoBind fun matches locn)
- = pprMatches sty (False, pprNonOp sty fun) matches
+ppr_sig sty (InlineSig var _)
+ = hsep [text "{-# INLINE", ppr sty var, text "#-}"]
- ppr sty (VarMonoBind name expr)
- = ppHang (ppCat [pprNonOp sty name, ppEquals]) 4 (ppr sty expr)
+ppr_sig sty (MagicUnfoldingSig var str _)
+ = hsep [text "{-# MAGIC_UNFOLDING", ppr sty var, ptext str, text "#-}"]
\end{code}
-%************************************************************************
-%* *
-\subsection{Collecting binders from @HsBinds@}
-%* *
-%************************************************************************
-
-Get all the binders in some @MonoBinds@, IN THE ORDER OF
-APPEARANCE; e.g., in:
-\begin{verbatim}
-...
-where
- (x, y) = ...
- f i j = ...
- [a, b] = ...
-\end{verbatim}
-it should return @[x, y, f, a, b]@ (remember, order important).
-
-\begin{code}
-collectTopLevelBinders :: HsBinds tyvar uvar name (InPat name) -> [name]
-collectTopLevelBinders EmptyBinds = []
-collectTopLevelBinders (SingleBind b) = collectBinders b
-collectTopLevelBinders (BindWith b _) = collectBinders b
-collectTopLevelBinders (ThenBinds b1 b2)
- = collectTopLevelBinders b1 ++ collectTopLevelBinders b2
-
-collectBinders :: Bind tyvar uvar name (InPat name) -> [name]
-collectBinders EmptyBind = []
-collectBinders (NonRecBind monobinds) = collectMonoBinders monobinds
-collectBinders (RecBind monobinds) = collectMonoBinders monobinds
-
-collectMonoBinders :: MonoBinds tyvar uvar name (InPat name) -> [name]
-collectMonoBinders EmptyMonoBinds = []
-collectMonoBinders (PatMonoBind pat grhss_w_binds _) = collectPatBinders pat
-collectMonoBinders (FunMonoBind f matches _) = [f]
-collectMonoBinders (VarMonoBind v expr) = error "collectMonoBinders"
-collectMonoBinders (AndMonoBinds bs1 bs2)
- = collectMonoBinders bs1 ++ collectMonoBinders bs2
-
--- We'd like the binders -- and where they came from --
--- so we can make new ones with equally-useful origin info.
-
-collectMonoBindersAndLocs
- :: MonoBinds tyvar uvar name (InPat name) -> [(name, SrcLoc)]
-
-collectMonoBindersAndLocs EmptyMonoBinds = []
-
-collectMonoBindersAndLocs (AndMonoBinds bs1 bs2)
- = collectMonoBindersAndLocs bs1 ++ collectMonoBindersAndLocs bs2
-
-collectMonoBindersAndLocs (PatMonoBind pat grhss_w_binds locn)
- = collectPatBinders pat `zip` repeat locn
-
-collectMonoBindersAndLocs (FunMonoBind f matches locn) = [(f, locn)]
-
-#ifdef DEBUG
-collectMonoBindersAndLocs (VarMonoBind v expr)
- = trace "collectMonoBindersAndLocs:VarMonoBind" []
- -- ToDo: this is dubious, i.e., wrong, but harmless?
-#endif
-\end{code}
projects / ghc-hetmet.git / blobdiff