+-- Generates the type environment that the stand-alone External Core tools use.
+gen_ext_core_source :: [Entry] -> String
+gen_ext_core_source entries =
+ "-----------------------------------------------------------------------\n"
+ ++ "-- This module is automatically generated by the GHC utility\n"
+ ++ "-- \"genprimopcode\". Do not edit!\n"
+ ++ "-----------------------------------------------------------------------\n"
+ ++ "module PrimEnv(primTcs, primVals, intLitTypes, ratLitTypes,\n"
+ ++ " charLitTypes, stringLitTypes) where\nimport Core\nimport Encoding\n\n"
+ ++ "primTcs :: [(Tcon, Kind)]\n"
+ ++ "primTcs = [\n"
+ ++ printList tcEnt entries
+ ++ " ]\n"
+ ++ "primVals :: [(Var, Ty)]\n"
+ ++ "primVals = [\n"
+ ++ printList valEnt entries
+ ++ "]\n"
+ ++ "intLitTypes :: [Ty]\n"
+ ++ "intLitTypes = [\n"
+ ++ printList tyEnt (intLitTys entries)
+ ++ "]\n"
+ ++ "ratLitTypes :: [Ty]\n"
+ ++ "ratLitTypes = [\n"
+ ++ printList tyEnt (ratLitTys entries)
+ ++ "]\n"
+ ++ "charLitTypes :: [Ty]\n"
+ ++ "charLitTypes = [\n"
+ ++ printList tyEnt (charLitTys entries)
+ ++ "]\n"
+ ++ "stringLitTypes :: [Ty]\n"
+ ++ "stringLitTypes = [\n"
+ ++ printList tyEnt (stringLitTys entries)
+ ++ "]\n\n"
+
+ where printList f = concat . intersperse ",\n" . filter (not . null) . map f
+ tcEnt (PrimTypeSpec {ty=t}) =
+ case t of
+ TyApp tc args -> parens tc (tcKind tc args)
+ _ -> error ("tcEnt: type in PrimTypeSpec is not a type"
+ ++ " constructor: " ++ show t)
+ tcEnt _ = ""
+ -- hack alert!
+ -- The primops.txt.pp format doesn't have enough information in it to
+ -- print out some of the information that ext-core needs (like kinds,
+ -- and later on in this code, module names) so we special-case. An
+ -- alternative would be to refer to things indirectly and hard-wire
+ -- certain things (e.g., the kind of the Any constructor, here) into
+ -- ext-core's Prims module again.
+ tcKind "Any" _ = "Klifted"
+ tcKind tc [] | last tc == '#' = "Kunlifted"
+ tcKind tc [] | otherwise = "Klifted"
+ -- assumes that all type arguments are lifted (are they?)
+ tcKind tc (v:as) = "(Karrow Klifted " ++ tcKind tc as
+ ++ ")"
+ valEnt (PseudoOpSpec {name=n, ty=t}) = valEntry n t
+ valEnt (PrimOpSpec {name=n, ty=t}) = valEntry n t
+ valEnt _ = ""
+ valEntry name ty = parens name (mkForallTy (freeTvars ty) (pty ty))
+ where pty (TyF t1 t2) = mkFunTy (pty t1) (pty t2)
+ pty (TyApp tc ts) = mkTconApp (mkTcon tc) (map pty ts)
+ pty (TyUTup ts) = mkUtupleTy (map pty ts)
+ pty (TyVar tv) = paren $ "Tvar \"" ++ tv ++ "\""
+
+ mkFunTy s1 s2 = "Tapp " ++ (paren ("Tapp (Tcon tcArrow)"
+ ++ " " ++ paren s1))
+ ++ " " ++ paren s2
+ mkTconApp tc args = foldl tapp tc args
+ mkTcon tc = paren $ "Tcon " ++ paren (qualify True tc)
+ mkUtupleTy args = foldl tapp (tcUTuple (length args)) args
+ mkForallTy [] t = t
+ mkForallTy vs t = foldr
+ (\ v s -> "Tforall " ++
+ (paren (quot v ++ ", " ++ vKind v)) ++ " "
+ ++ paren s) t vs
+
+ -- hack alert!
+ vKind "o" = "Kopen"
+ vKind _ = "Klifted"
+
+ freeTvars (TyF t1 t2) = freeTvars t1 `union` freeTvars t2
+ freeTvars (TyApp _ tys) = freeTvarss tys
+ freeTvars (TyVar v) = [v]
+ freeTvars (TyUTup tys) = freeTvarss tys
+ freeTvarss = nub . concatMap freeTvars
+
+ tapp s nextArg = paren $ "Tapp " ++ s ++ " " ++ paren nextArg
+ tcUTuple n = paren $ "Tcon " ++ paren (qualify False $ "Z"
+ ++ show n ++ "H")
+
+ tyEnt (PrimTypeSpec {ty=(TyApp tc args)}) = " " ++ paren ("Tcon " ++
+ (paren (qualify True tc)))
+ tyEnt _ = ""
+
+ -- more hacks. might be better to do this on the ext-core side,
+ -- as per earlier comment
+ qualify _ tc | tc == "ByteArr#" = qualify True "ByteArray#"
+ qualify _ tc | tc == "MutArr#" = qualify True "MutableArray#"
+ qualify _ tc | tc == "MutByteArr#" =
+ qualify True "MutableByteArray#"
+ qualify _ tc | tc == "Bool" = "Just boolMname" ++ ", "
+ ++ ze True tc
+ qualify _ tc | tc == "()" = "Just baseMname" ++ ", "
+ ++ ze True tc
+ qualify enc tc = "Just primMname" ++ ", " ++ (ze enc tc)
+ ze enc tc = (if enc then "zEncodeString " else "")
+ ++ "\"" ++ tc ++ "\""
+
+ intLitTys = prefixes ["Int", "Word", "Addr", "Char"]
+ ratLitTys = prefixes ["Float", "Double"]
+ charLitTys = prefixes ["Char"]
+ stringLitTys = prefixes ["Addr"]
+ prefixes ps = filter (\ t ->
+ case t of
+ (PrimTypeSpec {ty=(TyApp tc args)}) ->
+ any (\ p -> p `isPrefixOf` tc) ps
+ _ -> False)
+
+ parens n ty = " (zEncodeString \"" ++ n ++ "\", " ++ ty ++ ")"
+ paren s = "(" ++ s ++ ")"
+ quot s = "\"" ++ s ++ "\""
+