IMP_Ubiq()
-- friends:
-IMPORT_DELOOPER(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 ( HsType )
import CoreSyn ( SYN_IE(CoreExpr) )
--others:
import Id ( SYN_IE(DictVar), SYN_IE(Id), GenId )
-import Name ( pprNonSym, getOccName, OccName )
-import Outputable ( interpp'SP, ifnotPprForUser,
+import Name ( OccName, NamedThing(..) )
+import Outputable ( interpp'SP, ifnotPprForUser, pprQuote,
Outputable(..){-instance * (,)-}
)
-import PprCore ( GenCoreExpr {- instance Outputable -} )
+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
+
\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
- | 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]
-
- | 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"
-
- -- Creates bindings for *new* (polymorphic, overloaded) locals
- -- in terms of *old* (monomorphic, non-overloaded) ones.
- --
- -- See section 9 of static semantics paper for more details.
- -- (You can get a PhD for explaining the True Meaning
- -- of this last construct.)
+type RecFlag = Bool
+recursive = True
+nonRecursive = False
\end{code}
\begin{code}
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
+nullBinds (MonoBind b _ _) = nullMonoBinds b
\end{code}
\begin{code}
Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) =>
Outputable (HsBinds tyvar uvar id pat) where
- 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)))
-\end{code}
-
-%************************************************************************
-%* *
-\subsection{@Sig@: type signatures and value-modifying user pragmas}
-%* *
-%************************************************************************
-
-It is convenient to lump ``value-modifying'' user-pragmas (e.g.,
-``specialise this function to these four types...'') in with type
-signatures. Then all the machinery to move them into place, etc.,
-serves for both.
-
-\begin{code}
-data Sig name
- = Sig name -- a bog-std type signature
- (HsType name)
- SrcLoc
-
- | ClassOpSig name -- class-op sigs have different pragmas
- (HsType name)
- (ClassOpPragmas name) -- only interface ones have pragmas
- SrcLoc
-
- | SpecSig name -- specialise a function or datatype ...
- (HsType name) -- ... to these types
- (Maybe name) -- ... maybe using this as the code for it
- SrcLoc
-
- | InlineSig name -- INLINE f
- SrcLoc
-
- | DeforestSig name -- Deforest using this function definition
- SrcLoc
-
- | MagicUnfoldingSig
- name -- Associate the "name"d function with
- FAST_STRING -- the compiler-builtin unfolding (known
- SrcLoc -- by the String name)
-\end{code}
-
-\begin{code}
-instance (NamedThing name, Outputable name) => Outputable (Sig name) where
- ppr sty (Sig var ty _)
- = ppHang (ppCat [pprNonSym sty var, ppPStr 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 (DeforestSig var _)
- = ppHang (ppCat [ppStr "{-# DEFOREST", pprNonSym sty var])
- 4 (ppStr "#-}")
-
- 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("#-}")])
- where
- pp_using Nothing = ppNil
- pp_using (Just me) = ppCat [ppChar '=', 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)
+ 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}
%************************************************************************
\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
| CoreMonoBind id -- TRANSLATION
CoreExpr -- No zonking; this is a final CoreExpr with Ids and Types!
+
+ | 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"
+
+ -- Creates bindings for *new* (polymorphic, overloaded) locals
+ -- in terms of *old* (monomorphic, non-overloaded) ones.
+ --
+ -- See section 9 of static semantics paper for more details.
+ -- (You can get a PhD for explaining the True Meaning
+ -- 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}
nullMonoBinds :: MonoBinds tyvar uvar id pat -> 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
\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 mbind = pprQuote sty (\ sty -> ppr_monobind sty mbind)
+
- ppr sty (PatMonoBind pat grhss_n_binds locn)
- = ppHang (ppr sty pat) 4 (pprGRHSsAndBinds sty False grhss_n_binds)
+ppr_monobind sty EmptyMonoBinds = empty
+ppr_monobind sty (AndMonoBinds binds1 binds2)
+ = ($$) (ppr_monobind sty binds1) (ppr_monobind sty binds2)
- ppr sty (FunMonoBind fun inf matches locn)
- = pprMatches sty (False, pprNonSym sty fun) matches
+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 (VarMonoBind name expr)
- = ppHang (ppCat [pprNonSym sty name, ppEquals]) 4 (ppr sty expr)
+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 sty (CoreMonoBind name expr)
- = ppHang (ppCat [pprNonSym sty name, ppEquals]) 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}
%************************************************************************
%* *
-\subsection{Collecting binders from @HsBinds@}
+\subsection{@Sig@: type signatures and value-modifying user pragmas}
%* *
%************************************************************************
-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).
+It is convenient to lump ``value-modifying'' user-pragmas (e.g.,
+``specialise this function to these four types...'') in with type
+signatures. Then all the machinery to move them into place, etc.,
+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
+
+ | SpecSig name -- specialise a function or datatype ...
+ (HsType name) -- ... to these types
+ (Maybe name) -- ... maybe using this as the code for it
+ SrcLoc
+
+ | InlineSig name -- INLINE f
+ SrcLoc
+
+ | DeforestSig name -- Deforest using this function definition
+ SrcLoc
+
+ | MagicUnfoldingSig
+ name -- Associate the "name"d function with
+ FAST_STRING -- the compiler-builtin unfolding (known
+ SrcLoc -- by the String name)
+\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 (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))
-collectMonoBinders (FunMonoBind f _ matches loc) = unitBag (f,loc)
-collectMonoBinders (VarMonoBind v expr) = error "collectMonoBinders"
-collectMonoBinders (CoreMonoBind v expr) = error "collectMonoBinders"
-collectMonoBinders (AndMonoBinds bs1 bs2)
- = collectMonoBinders bs1 `unionBags` collectMonoBinders bs2
+instance (NamedThing name, Outputable name) => Outputable (Sig name) where
+ ppr sty sig = pprQuote sty (\ sty -> ppr_sig sty sig)
+
+
+ppr_sig sty (Sig var ty _)
+ = sep [ppr sty var <+> ptext SLIT("::"),
+ nest 4 (ppr sty ty)]
+
+ppr_sig sty (ClassOpSig var _ ty _)
+ = sep [ppr sty (getOccName var) <+> ptext SLIT("::"),
+ nest 4 (ppr sty ty)]
+
+ppr_sig sty (DeforestSig var _)
+ = hsep [text "{-# DEFOREST", ppr sty var, text "#-}"]
+
+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_sig sty (InlineSig var _)
+ = hsep [text "{-# INLINE", ppr sty var, text "#-}"]
+
+ppr_sig sty (MagicUnfoldingSig var str _)
+ = hsep [text "{-# MAGIC_UNFOLDING", ppr sty var, ptext str, text "#-}"]
\end{code}
+
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