\section[HsDecls]{Abstract syntax: global declarations}
Definitions for: @FixityDecl@, @TyDecl@ and @ConDecl@, @ClassDecl@,
-@InstDecl@, @DefaultDecl@.
+@InstDecl@, @DefaultDecl@ and @ForeignDecl@.
\begin{code}
-#include "HsVersions.h"
-
module HsDecls where
-IMP_Ubiq()
+#include "HsVersions.h"
-- friends:
import HsBinds ( HsBinds, MonoBinds, Sig, nullMonoBinds )
-import HsPragmas ( DataPragmas, ClassPragmas,
- InstancePragmas, ClassOpPragmas
- )
+import HsPragmas ( DataPragmas, ClassPragmas )
import HsTypes
-import IdInfo
-import SpecEnv ( SpecEnv )
import HsCore ( UfExpr )
import BasicTypes ( Fixity, NewOrData(..) )
+import IdInfo ( ArgUsageInfo, FBTypeInfo, ArityInfo, UpdateInfo )
+import Demand ( Demand )
+import CallConv ( CallConv, pprCallConv )
-- others:
import Name ( getOccName, OccName, NamedThing(..) )
-import Outputable ( interppSP, interpp'SP,
- PprStyle(..), Outputable(..){-instance * []-}
- )
-import Pretty
+import Outputable
import SrcLoc ( SrcLoc )
import Util
\end{code}
%************************************************************************
\begin{code}
-data HsDecl tyvar uvar name pat
+data HsDecl flexi name pat
= TyD (TyDecl name)
- | ClD (ClassDecl tyvar uvar name pat)
- | InstD (InstDecl tyvar uvar name pat)
+ | ClD (ClassDecl flexi name pat)
+ | InstD (InstDecl flexi name pat)
| DefD (DefaultDecl name)
- | ValD (HsBinds tyvar uvar name pat)
+ | ValD (HsBinds flexi name pat)
| SigD (IfaceSig name)
+ | ForD (ForeignDecl name)
\end{code}
\begin{code}
#ifdef DEBUG
-hsDeclName :: (NamedThing name, Outputable name, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
- => HsDecl tyvar uvar name pat -> name
+hsDeclName :: (NamedThing name, Outputable name, Outputable pat)
+ => HsDecl flexi name pat -> name
#endif
hsDeclName (TyD (TyData _ _ name _ _ _ _ _)) = name
hsDeclName (TyD (TySynonym name _ _ _)) = name
-hsDeclName (ClD (ClassDecl _ name _ _ _ _ _)) = name
+hsDeclName (ClD (ClassDecl _ name _ _ _ _ _ _ _)) = name
hsDeclName (SigD (IfaceSig name _ _ _)) = name
hsDeclName (InstD (InstDecl _ _ _ (Just name) _)) = name
+hsDeclName (ForD (ForeignDecl name _ _ _ _ _)) = name
-- Others don't make sense
#ifdef DEBUG
-hsDeclName x = pprPanic "HsDecls.hsDeclName" (ppr PprDebug x)
+hsDeclName x = pprPanic "HsDecls.hsDeclName" (ppr x)
#endif
\end{code}
\begin{code}
-instance (NamedThing name, Outputable name, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
- => Outputable (HsDecl tyvar uvar name pat) where
+instance (NamedThing name, Outputable name, Outputable pat)
+ => Outputable (HsDecl flexi name pat) where
- ppr sty (TyD td) = ppr sty td
- ppr sty (ClD cd) = ppr sty cd
- ppr sty (SigD sig) = ppr sty sig
- ppr sty (ValD binds) = ppr sty binds
- ppr sty (DefD def) = ppr sty def
- ppr sty (InstD inst) = ppr sty inst
+ ppr (TyD td) = ppr td
+ ppr (ClD cd) = ppr cd
+ ppr (SigD sig) = ppr sig
+ ppr (ValD binds) = ppr binds
+ ppr (DefD def) = ppr def
+ ppr (InstD inst) = ppr inst
+ ppr (ForD fd) = ppr fd
#ifdef DEBUG
-instance (Ord3 name, Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar,
- NamedThing name, Outputable name, Outputable pat) =>
- Ord3 (HsDecl tyvar uvar name pat) where
+-- hsDeclName needs more context when DEBUG is on
+instance (NamedThing name, Outputable name, Outputable pat, Eq name)
+ => Eq (HsDecl flex name pat) where
+ d1 == d2 = hsDeclName d1 == hsDeclName d2
+
+instance (NamedThing name, Outputable name, Outputable pat, Ord name)
+ => Ord (HsDecl flex name pat) where
+ d1 `compare` d2 = hsDeclName d1 `compare` hsDeclName d2
#else
-instance (Ord3 name) => Ord3 (HsDecl tyvar uvar name pat) where
+instance (Eq name) => Eq (HsDecl flex name pat) where
+ d1 == d2 = hsDeclName d1 == hsDeclName d2
+
+instance (Ord name) => Ord (HsDecl flexi name pat) where
+ d1 `compare` d2 = hsDeclName d1 `compare` hsDeclName d2
#endif
- d1 `cmp` d2 = hsDeclName d1 `cmp` hsDeclName d2
\end{code}
data FixityDecl name = FixityDecl name Fixity SrcLoc
instance Outputable name => Outputable (FixityDecl name) where
- ppr sty (FixityDecl name fixity loc) = sep [ppr sty fixity, ppr sty name]
+ ppr (FixityDecl name fixity loc) = sep [ppr fixity, ppr name]
\end{code}
instance (NamedThing name, Outputable name)
=> Outputable (TyDecl name) where
- ppr sty (TySynonym tycon tyvars mono_ty src_loc)
- = hang (pp_decl_head sty SLIT("type") empty tycon tyvars)
- 4 (ppr sty mono_ty)
+ ppr (TySynonym tycon tyvars mono_ty src_loc)
+ = hang (pp_decl_head SLIT("type") empty tycon tyvars)
+ 4 (ppr mono_ty)
- ppr sty (TyData new_or_data context tycon tyvars condecls derivings pragmas src_loc)
- = pp_tydecl sty
- (pp_decl_head sty keyword (pp_context_and_arrow sty context) tycon tyvars)
- (pp_condecls sty condecls)
+ ppr (TyData new_or_data context tycon tyvars condecls derivings pragmas src_loc)
+ = pp_tydecl
+ (pp_decl_head keyword (pp_context_and_arrow context) tycon tyvars)
+ (pp_condecls condecls)
derivings
where
keyword = case new_or_data of
NewType -> SLIT("newtype")
DataType -> SLIT("data")
-pp_decl_head sty str pp_context tycon tyvars
- = hsep [ptext str, pp_context, ppr sty tycon,
- interppSP sty tyvars, ptext SLIT("=")]
+pp_decl_head str pp_context tycon tyvars
+ = hsep [ptext str, pp_context, ppr tycon,
+ interppSP tyvars, ptext SLIT("=")]
-pp_condecls sty [] = empty -- Curious!
-pp_condecls sty (c:cs)
- = sep (ppr sty c : map (\ c -> (<>) (ptext SLIT("| ")) (ppr sty c)) cs)
+pp_condecls [] = empty -- Curious!
+pp_condecls (c:cs)
+ = sep (ppr c : map (\ c -> (<>) (ptext SLIT("| ")) (ppr c)) cs)
-pp_tydecl sty pp_head pp_decl_rhs derivings
+pp_tydecl pp_head pp_decl_rhs derivings
= hang pp_head 4 (sep [
pp_decl_rhs,
- case (derivings, sty) of
- (Nothing,_) -> empty
- (_,PprInterface) -> empty -- No derivings in interfaces
- (Just ds,_) -> hsep [ptext SLIT("deriving"), parens (interpp'SP sty ds)]
+ case derivings of
+ Nothing -> empty
+ Just ds -> hsep [ptext SLIT("deriving"), parens (interpp'SP ds)]
])
-pp_context_and_arrow :: Outputable name => PprStyle -> Context name -> Doc
-pp_context_and_arrow sty [] = empty
-pp_context_and_arrow sty theta = hsep [pprContext sty theta, ptext SLIT("=>")]
+pp_context_and_arrow :: Outputable name => Context name -> SDoc
+pp_context_and_arrow [] = empty
+pp_context_and_arrow theta = hsep [pprContext theta, ptext SLIT("=>")]
\end{code}
A type for recording what types a datatype should be specialised to.
instance (NamedThing name, Outputable name)
=> Outputable (SpecDataSig name) where
- ppr sty (SpecDataSig tycon ty _)
- = hsep [text "{-# SPECIALIZE data", ppr sty ty, text "#-}"]
+ ppr (SpecDataSig tycon ty _)
+ = hsep [text "{-# SPECIALIZE data", ppr ty, text "#-}"]
\end{code}
%************************************************************************
\begin{code}
instance (NamedThing name, Outputable name) => Outputable (ConDecl name) where
- ppr sty (ConDecl con cxt con_details loc)
- = pp_context_and_arrow sty cxt <+> ppr_con_details sty con con_details
+ ppr (ConDecl con cxt con_details loc)
+ = pp_context_and_arrow cxt <+> ppr_con_details con con_details
-ppr_con_details sty con (InfixCon ty1 ty2)
- = hsep [ppr_bang sty ty1, ppr sty con, ppr_bang sty ty2]
+ppr_con_details con (InfixCon ty1 ty2)
+ = hsep [ppr_bang ty1, ppr con, ppr_bang ty2]
-ppr_con_details sty con (VanillaCon tys)
- = ppr sty con <+> hsep (map (ppr_bang sty) tys)
+ppr_con_details con (VanillaCon tys)
+ = ppr con <+> hsep (map (ppr_bang) tys)
-ppr_con_details sty con (NewCon ty)
- = ppr sty con <+> pprParendHsType sty ty
+ppr_con_details con (NewCon ty)
+ = ppr con <+> pprParendHsType ty
-ppr_con_details sty con (RecCon fields)
- = ppr sty con <+> braces (hsep (punctuate comma (map ppr_field fields)))
+ppr_con_details con (RecCon fields)
+ = ppr con <+> braces (hsep (punctuate comma (map ppr_field fields)))
where
- ppr_field (ns, ty) = hsep (map (ppr sty) ns) <+>
+ ppr_field (ns, ty) = hsep (map (ppr) ns) <+>
ptext SLIT("::") <+>
- ppr_bang sty ty
+ ppr_bang ty
-ppr_bang sty (Banged ty) = ptext SLIT("!") <> pprParendHsType sty ty
-ppr_bang sty (Unbanged ty) = pprParendHsType sty ty
+ppr_bang (Banged ty) = ptext SLIT("!") <> pprParendHsType ty
+ppr_bang (Unbanged ty) = pprParendHsType ty
\end{code}
%************************************************************************
%************************************************************************
\begin{code}
-data ClassDecl tyvar uvar name pat
+data ClassDecl flexi name pat
= ClassDecl (Context name) -- context...
name -- name of the class
- (HsTyVar name) -- the class type variable
+ [HsTyVar name] -- the class type variables
[Sig name] -- methods' signatures
- (MonoBinds tyvar uvar name pat) -- default methods
+ (MonoBinds flexi name pat) -- default methods
(ClassPragmas name)
+ name name -- The names of the tycon and datacon for this class
+ -- These are filled in by the renamer
SrcLoc
\end{code}
\begin{code}
-instance (NamedThing name, Outputable name, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
- => Outputable (ClassDecl tyvar uvar name pat) where
+instance (NamedThing name, Outputable name, Outputable pat)
+ => Outputable (ClassDecl flexi name pat) where
- ppr sty (ClassDecl context clas tyvar sigs methods pragmas src_loc)
+ ppr (ClassDecl context clas tyvars sigs methods pragmas _ _ src_loc)
| null sigs -- No "where" part
= top_matter
| otherwise -- Laid out
= sep [hsep [top_matter, ptext SLIT("where {")],
nest 4 (vcat [sep (map ppr_sig sigs),
- ppr sty methods,
+ ppr methods,
char '}'])]
where
- top_matter = hsep [ptext SLIT("class"), pp_context_and_arrow sty context,
- ppr sty clas, ppr sty tyvar]
- ppr_sig sig = ppr sty sig <> semi
+ top_matter = hsep [ptext SLIT("class"), pp_context_and_arrow context,
+ ppr clas, hsep (map (ppr) tyvars)]
+ ppr_sig sig = ppr sig <> semi
\end{code}
%************************************************************************
%* *
-\subsection[InstDecl]{An instance declaration (also, @SpecInstSig@)}
+\subsection[InstDecl]{An instance declaration
%* *
%************************************************************************
\begin{code}
-data InstDecl tyvar uvar name pat
+data InstDecl flexi name pat
= InstDecl (HsType name) -- Context => Class Instance-type
-- Using a polytype means that the renamer conveniently
-- figures out the quantified type variables for us.
- (MonoBinds tyvar uvar name pat)
+ (MonoBinds flexi name pat)
[Sig name] -- User-supplied pragmatic info
\end{code}
\begin{code}
-instance (NamedThing name, Outputable name, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
- => Outputable (InstDecl tyvar uvar name pat) where
-
- ppr sty (InstDecl inst_ty binds uprags dfun_name src_loc)
- | case sty of { PprInterface -> True; other -> False} ||
- nullMonoBinds binds && null uprags
- = hsep [ptext SLIT("instance"), ppr sty inst_ty]
-
- | otherwise
- = vcat [hsep [ptext SLIT("instance"), ppr sty inst_ty, ptext SLIT("where")],
- nest 4 (ppr sty uprags),
- nest 4 (ppr sty binds) ]
+instance (NamedThing name, Outputable name, Outputable pat)
+ => Outputable (InstDecl flexi name pat) where
+
+ ppr (InstDecl inst_ty binds uprags dfun_name src_loc)
+ = getPprStyle $ \ sty ->
+ if ifaceStyle sty || (nullMonoBinds binds && null uprags) then
+ hsep [ptext SLIT("instance"), ppr inst_ty]
+ else
+ vcat [hsep [ptext SLIT("instance"), ppr inst_ty, ptext SLIT("where")],
+ nest 4 (ppr uprags),
+ nest 4 (ppr binds) ]
\end{code}
-A type for recording what instances the user wants to specialise;
-called a ``Sig'' because it's sort of like a ``type signature'' for an
-instance.
-\begin{code}
-data SpecInstSig name
- = SpecInstSig name -- class
- (HsType name) -- type to specialise to
- SrcLoc
-
-instance (NamedThing name, Outputable name)
- => Outputable (SpecInstSig name) where
-
- ppr sty (SpecInstSig clas ty _)
- = hsep [text "{-# SPECIALIZE instance", ppr sty clas, ppr sty ty, text "#-}"]
-\end{code}
%************************************************************************
%* *
instance (NamedThing name, Outputable name)
=> Outputable (DefaultDecl name) where
- ppr sty (DefaultDecl tys src_loc)
- = (<>) (ptext SLIT("default ")) (parens (interpp'SP sty tys))
+ ppr (DefaultDecl tys src_loc)
+ = ptext SLIT("default") <+> parens (interpp'SP tys)
+\end{code}
+
+%************************************************************************
+%* *
+\subsection{Foreign function interface declaration}
+%* *
+%************************************************************************
+
+\begin{code}
+data ForeignDecl name =
+ ForeignDecl
+ name
+ ForKind
+ (HsType name)
+ ExtName
+ CallConv
+ SrcLoc
+
+instance (NamedThing name, Outputable name)
+ => Outputable (ForeignDecl name) where
+
+ ppr (ForeignDecl nm imp_exp ty ext_name cconv src_loc)
+ = ptext SLIT("foreign") <+> ppr_imp_exp <+> pprCallConv cconv <+>
+ ppr ext_name <+> ppr_unsafe <+> ppr nm <+> ptext SLIT("::") <+> ppr ty
+ where
+ (ppr_imp_exp, ppr_unsafe) =
+ case imp_exp of
+ FoLabel -> (ptext SLIT("label"), empty)
+ FoExport -> (ptext SLIT("export"), empty)
+ FoImport us
+ | us -> (ptext SLIT("import"), ptext SLIT("unsafe"))
+ | otherwise -> (ptext SLIT("import"), empty)
+
+data ForKind
+ = FoLabel
+ | FoExport
+ | FoImport Bool -- True => unsafe call.
+
+data ExtName
+ = Dynamic
+ | ExtName FAST_STRING (Maybe FAST_STRING)
+
+isDynamic :: ExtName -> Bool
+isDynamic Dynamic = True
+isDynamic _ = False
+
+
+instance Outputable ExtName where
+ ppr Dynamic = ptext SLIT("dynamic")
+ ppr (ExtName nm mb_mod) =
+ case mb_mod of { Nothing -> empty; Just m -> doubleQuotes (ptext m) } <+>
+ doubleQuotes (ptext nm)
+
\end{code}
%************************************************************************
SrcLoc
instance (NamedThing name, Outputable name) => Outputable (IfaceSig name) where
- ppr sty (IfaceSig var ty _ _)
- = hang (hsep [ppr sty var, ptext SLIT("::")])
- 4 (ppr sty ty)
+ ppr (IfaceSig var ty _ _)
+ = hang (hsep [ppr var, ptext SLIT("::")])
+ 4 (ppr ty)
data HsIdInfo name
= HsArity ArityInfo
| HsStrictness (HsStrictnessInfo name)
| HsUnfold Bool (UfExpr name) -- True <=> INLINE pragma
| HsUpdate UpdateInfo
- | HsDeforest DeforestInfo
| HsArgUsage ArgUsageInfo
| HsFBType FBTypeInfo
- -- ToDo: specialisations
+ | HsSpecialise [HsTyVar name] [HsType name] (UfExpr name)
+
data HsStrictnessInfo name
= HsStrictnessInfo [Demand]
projects / ghc-hetmet.git / blobdiff