[project @ 1998-08-14 11:25:20 by sof]

Foreign declarations

diff --git a/ghc/compiler/hsSyn/HsDecls.lhs b/ghc/compiler/hsSyn/HsDecls.lhs
index f7889a4..944c274 100644 (file)
--- a/ghc/compiler/hsSyn/HsDecls.lhs
+++ b/ghc/compiler/hsSyn/HsDecls.lhs
@@ -4,7 +4,7 @@
 \section[HsDecls]{Abstract syntax: global declarations}
 
 Definitions for: @FixityDecl@, @TyDecl@ and @ConDecl@, @ClassDecl@,
-@InstDecl@, @DefaultDecl@.
+@InstDecl@, @DefaultDecl@ and @ForeignDecl@.
 
 \begin{code}
 module HsDecls where
@@ -19,6 +19,7 @@ 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(..) )
@@ -42,6 +43,7 @@ data HsDecl flexi name pat
   | DefD       (DefaultDecl name)
   | ValD       (HsBinds flexi name pat)
   | SigD       (IfaceSig name)
+  | ForD        (ForeignDecl name)
 \end{code}
 
 \begin{code}
@@ -54,6 +56,7 @@ hsDeclName (TyD (TySynonym 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 x)
@@ -70,6 +73,7 @@ instance (NamedThing name, Outputable name, Outputable pat)
     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
@@ -342,6 +346,51 @@ instance (NamedThing name, Outputable name)
 
 %************************************************************************
 %*                                                                     *
+\subsection{Foreign function interface declaration}
+%*                                                                     *
+%************************************************************************
+
+\begin{code}
+data ForeignDecl name = 
+   ForeignDecl 
+        name 
+       (Maybe Bool)   -- Nothing => foreign export; Just unsafe => foreign import unsafe
+       (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
+            Nothing -> (ptext SLIT("export"), empty)
+            Just us -> (ptext SLIT("import"), ptext SLIT("unsafe"))
+
+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}
 %*                                                                     *
 %************************************************************************