%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[HsDecls]{Abstract syntax: global declarations}
Definitions for: @FixityDecl@, @TyDecl@ and @ConDecl@, @ClassDecl@,
-@InstDecl@, @DefaultDecl@.
+@InstDecl@, @DefaultDecl@ and @ForeignDecl@.
\begin{code}
module HsDecls where
import HsTypes
import HsCore ( UfExpr )
import BasicTypes ( Fixity, NewOrData(..) )
-import IdInfo ( ArgUsageInfo, FBTypeInfo, ArityInfo, UpdateInfo )
+import IdInfo ( ArityInfo, UpdateInfo, InlinePragInfo )
import Demand ( Demand )
+import CallConv ( CallConv, pprCallConv )
-- others:
-import Name ( getOccName, OccName, NamedThing(..) )
+import Name ( NamedThing )
import Outputable
import SrcLoc ( SrcLoc )
import Util
| DefD (DefaultDecl name)
| ValD (HsBinds flexi name pat)
| SigD (IfaceSig name)
+ | ForD (ForeignDecl name)
\end{code}
\begin{code}
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 x)
ppr (ValD binds) = ppr binds
ppr (DefD def) = ppr def
ppr (InstD inst) = ppr inst
+ ppr (ForD fd) = ppr fd
#ifdef DEBUG
-- hsDeclName needs more context when DEBUG is on
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_decl_head keyword (pprContext context) tycon tyvars)
(pp_condecls condecls)
derivings
where
Nothing -> empty
Just ds -> hsep [ptext SLIT("deriving"), parens (interpp'SP ds)]
])
-
-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.
\begin{code}
data ConDecl name
= ConDecl name -- Constructor name
- (Context name) -- Existential context for this constructor
+
+ [HsTyVar name] -- Existentially quantified type variables
+ (Context name) -- ...and context
+ -- If both are empty then there are no existentials
+
(ConDetails name)
SrcLoc
\begin{code}
instance (NamedThing name, Outputable name) => Outputable (ConDecl name) where
- ppr (ConDecl con cxt con_details loc)
- = pp_context_and_arrow cxt <+> ppr_con_details con con_details
+ ppr (ConDecl con tvs cxt con_details loc)
+ = sep [pprForAll tvs, pprContext cxt, ppr_con_details con con_details]
ppr_con_details con (InfixCon ty1 ty2)
= hsep [ppr_bang ty1, ppr con, ppr_bang ty2]
ppr methods,
char '}'])]
where
- top_matter = hsep [ptext SLIT("class"), pp_context_and_arrow context,
+ top_matter = hsep [ptext SLIT("class"), pprContext 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
%* *
%************************************************************************
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 (SpecInstSig clas ty _)
- = hsep [text "{-# SPECIALIZE instance", ppr clas, ppr ty, text "#-}"]
-\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}
+
+%************************************************************************
+%* *
\subsection{Signatures in interface files}
%* *
%************************************************************************
data HsIdInfo name
= HsArity ArityInfo
| HsStrictness (HsStrictnessInfo name)
- | HsUnfold Bool (UfExpr name) -- True <=> INLINE pragma
+ | HsUnfold InlinePragInfo (Maybe (UfExpr name))
| HsUpdate UpdateInfo
- | HsArgUsage ArgUsageInfo
- | HsFBType FBTypeInfo
| HsSpecialise [HsTyVar name] [HsType name] (UfExpr name)
+ | HsNoCafRefs
data HsStrictnessInfo name
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