-- Standard modules
import qualified Maybe
+import qualified Data.Either as Either
import qualified Data.List as List
import qualified Data.Map as Map
import qualified Control.Monad as Monad
]
-- Translate a Haskell type to a VHDL type, generating a new type if needed.
-vhdl_ty :: String -> Type.Type -> VHDLSession AST.TypeMark
+-- Returns an error value, using the given message, when no type could be
+-- created.
+vhdl_ty :: String -> Type.Type -> TypeSession AST.TypeMark
vhdl_ty msg ty = do
+ tm_either <- vhdl_ty_either ty
+ case tm_either of
+ Right tm -> return tm
+ Left err -> error $ msg ++ "\n" ++ err
+
+-- Translate a Haskell type to a VHDL type, generating a new type if needed.
+-- Returns either an error message or the resulting type.
+vhdl_ty_either :: Type.Type -> TypeSession (Either String AST.TypeMark)
+vhdl_ty_either ty = do
typemap <- getA vsTypes
htype <- mkHType ty
let builtin_ty = do -- See if this is a tycon and lookup its name
let existing_ty = (fmap fst) $ Map.lookup htype typemap
case Monoid.getFirst $ Monoid.mconcat (map Monoid.First [builtin_ty, existing_ty]) of
-- Found a type, return it
- Just t -> return t
+ Just t -> return (Right t)
-- No type yet, try to construct it
Nothing -> do
- newty_maybe <- (construct_vhdl_ty msg ty)
+ newty_maybe <- (construct_vhdl_ty ty)
case newty_maybe of
- Just (ty_id, ty_def) -> do
+ Right (ty_id, ty_def) -> do
-- TODO: Check name uniqueness
modA vsTypes (Map.insert htype (ty_id, ty_def))
modA vsTypeDecls (\typedefs -> typedefs ++ [mktydecl (ty_id, ty_def)])
- return ty_id
- Nothing -> error $ msg ++ "\nVHDLTools.vhdl_ty: Unsupported Haskell type: " ++ pprString ty ++ "\n"
-
--- Construct a new VHDL type for the given Haskell type.
-construct_vhdl_ty :: String -> Type.Type -> VHDLSession (Maybe (AST.TypeMark, Either AST.TypeDef AST.SubtypeIn))
-construct_vhdl_ty msg ty = do
+ return (Right ty_id)
+ Left err -> return $ Left $
+ "VHDLTools.vhdl_ty: Unsupported Haskell type: " ++ pprString ty ++ "\n"
+ ++ err
+
+-- Construct a new VHDL type for the given Haskell type. Returns an error
+-- message or the resulting typemark and typedef.
+construct_vhdl_ty :: Type.Type -> TypeSession (Either String (AST.TypeMark, Either AST.TypeDef AST.SubtypeIn))
+construct_vhdl_ty ty = do
case Type.splitTyConApp_maybe ty of
Just (tycon, args) -> do
let name = Name.getOccString (TyCon.tyConName tycon)
case name of
- "TFVec" -> do
- res <- mk_vector_ty ty
- return $ Just $ (Arrow.second Right) res
+ "TFVec" -> mk_vector_ty ty
-- "SizedWord" -> do
-- res <- mk_vector_ty (sized_word_len ty) ty
-- return $ Just $ (Arrow.second Left) res
- "RangedWord" -> do
- res <- mk_natural_ty 0 (ranged_word_bound ty)
- return $ Just $ (Arrow.second Right) res
+ "RangedWord" -> mk_natural_ty 0 (ranged_word_bound ty)
-- Create a custom type from this tycon
- otherwise -> mk_tycon_ty msg tycon args
- Nothing -> return $ Nothing
+ otherwise -> mk_tycon_ty tycon args
+ Nothing -> return (Left $ "VHDLTools.construct_vhdl_ty: Cannot create type for non-tycon type: " ++ pprString ty ++ "\n")
-- | Create VHDL type for a custom tycon
-mk_tycon_ty :: String -> TyCon.TyCon -> [Type.Type] -> VHDLSession (Maybe (AST.TypeMark, Either AST.TypeDef AST.SubtypeIn))
-mk_tycon_ty msg tycon args =
+mk_tycon_ty :: TyCon.TyCon -> [Type.Type] -> TypeSession (Either String (AST.TypeMark, Either AST.TypeDef AST.SubtypeIn))
+mk_tycon_ty tycon args =
case TyCon.tyConDataCons tycon of
-- Not an algebraic type
- [] -> error $ "\nVHDLTools.mk_tycon_ty: Only custom algebraic types are supported: " ++ pprString tycon
+ [] -> return (Left $ "VHDLTools.mk_tycon_ty: Only custom algebraic types are supported: " ++ pprString tycon ++ "\n")
[dc] -> do
let arg_tys = DataCon.dataConRepArgTys dc
-- TODO: CoreSubst docs say each Subs can be applied only once. Is this a
-- violation? Or does it only mean not to apply it again to the same
-- subject?
let real_arg_tys = map (CoreSubst.substTy subst) arg_tys
- let error_msg = msg ++ "\nVHDLTools.mk_tycon_ty: Can not construct type for: " ++ pprString tycon ++ "\n because no type can be construced for one of the arguments."
- elem_tys <- mapM (vhdl_ty error_msg) real_arg_tys
- let elems = zipWith AST.ElementDec recordlabels elem_tys
- -- For a single construct datatype, build a record with one field for
- -- each argument.
- -- TODO: Add argument type ids to this, to ensure uniqueness
- -- TODO: Special handling for tuples?
- let elem_names = concat $ map prettyShow elem_tys
- let ty_id = mkVHDLExtId $ nameToString (TyCon.tyConName tycon) ++ elem_names
- let ty_def = AST.TDR $ AST.RecordTypeDef elems
- return $ Just (ty_id, Left ty_def)
- dcs -> error $ "\nVHDLTools.mk_tycon_ty: Only single constructor datatypes supported: " ++ pprString tycon
+ elem_tys_either <- mapM vhdl_ty_either real_arg_tys
+ case Either.partitionEithers elem_tys_either of
+ -- No errors in element types
+ ([], elem_tys) -> do
+ let elems = zipWith AST.ElementDec recordlabels elem_tys
+ -- For a single construct datatype, build a record with one field for
+ -- each argument.
+ -- TODO: Add argument type ids to this, to ensure uniqueness
+ -- TODO: Special handling for tuples?
+ let elem_names = concat $ map prettyShow elem_tys
+ let ty_id = mkVHDLExtId $ nameToString (TyCon.tyConName tycon) ++ elem_names
+ let ty_def = AST.TDR $ AST.RecordTypeDef elems
+ return $ Right (ty_id, Left ty_def)
+ -- There were errors in element types
+ (errors, _) -> return $ Left $
+ "VHDLTools.mk_tycon_ty: Can not construct type for: " ++ pprString tycon ++ "\n because no type can be construced for some of the arguments.\n"
+ ++ (concat errors)
+ dcs -> return $ Left $ "VHDLTools.mk_tycon_ty: Only single constructor datatypes supported: " ++ pprString tycon ++ "\n"
where
-- Create a subst that instantiates all types passed to the tycon
-- TODO: I'm not 100% sure that this is the right way to do this. It seems
-- | Create a VHDL vector type
mk_vector_ty ::
Type.Type -- ^ The Haskell type of the Vector
- -> VHDLSession (AST.TypeMark, AST.SubtypeIn) -- The typemark created.
+ -> TypeSession (Either String (AST.TypeMark, Either AST.TypeDef AST.SubtypeIn))
+ -- ^ An error message or The typemark created.
mk_vector_ty ty = do
types_map <- getA vsTypes
let vec_ty = Type.mkAppTy nvec nvec_el
let len = tfvec_len ty
let el_ty = tfvec_elem ty
- let error_msg = "\nVHDLTools.mk_vector_ty: Can not construct vectortype for elementtype: " ++ pprString el_ty
- el_ty_tm <- vhdl_ty error_msg el_ty
- let ty_id = mkVHDLExtId $ "vector-"++ (AST.fromVHDLId el_ty_tm) ++ "-0_to_" ++ (show len)
- let range = AST.ConstraintIndex $ AST.IndexConstraint [AST.ToRange (AST.PrimLit "0") (AST.PrimLit $ show (len - 1))]
- let existing_elem_ty = (fmap fst) $ Map.lookup (StdType $ OrdType vec_ty) types_map
- case existing_elem_ty of
- Just t -> do
- let ty_def = AST.SubtypeIn t (Just range)
- return (ty_id, ty_def)
- Nothing -> do
- let vec_id = mkVHDLExtId $ "vector_" ++ (AST.fromVHDLId el_ty_tm)
- let vec_def = AST.TDA $ AST.UnconsArrayDef [tfvec_indexTM] el_ty_tm
- modA vsTypes (Map.insert (StdType $ OrdType vec_ty) (vec_id, (Left vec_def)))
- modA vsTypeDecls (\typedefs -> typedefs ++ [mktydecl (vec_id, (Left vec_def))])
- let ty_def = AST.SubtypeIn vec_id (Just range)
- return (ty_id, ty_def)
+ el_ty_tm_either <- vhdl_ty_either el_ty
+ case el_ty_tm_either of
+ -- Could create element type
+ Right el_ty_tm -> do
+ let ty_id = mkVHDLExtId $ "vector-"++ (AST.fromVHDLId el_ty_tm) ++ "-0_to_" ++ (show len)
+ let range = AST.ConstraintIndex $ AST.IndexConstraint [AST.ToRange (AST.PrimLit "0") (AST.PrimLit $ show (len - 1))]
+ let existing_elem_ty = (fmap fst) $ Map.lookup (StdType $ OrdType vec_ty) types_map
+ case existing_elem_ty of
+ Just t -> do
+ let ty_def = AST.SubtypeIn t (Just range)
+ return (Right (ty_id, Right ty_def))
+ Nothing -> do
+ let vec_id = mkVHDLExtId $ "vector_" ++ (AST.fromVHDLId el_ty_tm)
+ let vec_def = AST.TDA $ AST.UnconsArrayDef [tfvec_indexTM] el_ty_tm
+ modA vsTypes (Map.insert (StdType $ OrdType vec_ty) (vec_id, (Left vec_def)))
+ modA vsTypeDecls (\typedefs -> typedefs ++ [mktydecl (vec_id, (Left vec_def))])
+ let ty_def = AST.SubtypeIn vec_id (Just range)
+ return (Right (ty_id, Right ty_def))
+ -- Could not create element type
+ Left err -> return $ Left $
+ "VHDLTools.mk_vector_ty: Can not construct vectortype for elementtype: " ++ pprString el_ty ++ "\n"
+ ++ err
mk_natural_ty ::
Int -- ^ The minimum bound (> 0)
-> Int -- ^ The maximum bound (> minimum bound)
- -> VHDLSession (AST.TypeMark, AST.SubtypeIn) -- The typemark created.
+ -> TypeSession (Either String (AST.TypeMark, Either AST.TypeDef AST.SubtypeIn))
+ -- ^ An error message or The typemark created.
mk_natural_ty min_bound max_bound = do
let ty_id = mkVHDLExtId $ "nat_" ++ (show min_bound) ++ "_to_" ++ (show max_bound)
let range = AST.ConstraintRange $ AST.SubTypeRange (AST.PrimLit $ (show min_bound)) (AST.PrimLit $ (show max_bound))
let ty_def = AST.SubtypeIn naturalTM (Just range)
- return (ty_id, ty_def)
+ return (Right (ty_id, Right ty_def))
-- Finds the field labels for VHDL type generated for the given Core type,
-- which must result in a record type.
-getFieldLabels :: Type.Type -> VHDLSession [AST.VHDLId]
+getFieldLabels :: Type.Type -> TypeSession [AST.VHDLId]
getFieldLabels ty = do
-- Ensure that the type is generated (but throw away it's VHDLId)
let error_msg = "\nVHDLTools.getFieldLabels: Can not get field labels, because: " ++ pprString ty ++ "can not be generated."
mktydecl (ty_id, Left ty_def) = AST.PDITD $ AST.TypeDec ty_id ty_def
mktydecl (ty_id, Right ty_def) = AST.PDISD $ AST.SubtypeDec ty_id ty_def
-mkHType :: Type.Type -> VHDLSession HType
+mkHType :: Type.Type -> TypeSession HType
mkHType ty = do
-- FIXME: Do we really need to do this here again?
let builtin_ty = do -- See if this is a tycon and lookup its name
Nothing -> return $ StdType $ OrdType ty
-- FIXME: Do we really need to do this here again?
-mkTyConHType :: TyCon.TyCon -> [Type.Type] -> VHDLSession HType
+mkTyConHType :: TyCon.TyCon -> [Type.Type] -> TypeSession HType
mkTyConHType tycon args =
case TyCon.tyConDataCons tycon of
-- Not an algebraic type
dcs -> error $ "\nVHDLTools.mkHType: Only single constructor datatypes supported: " ++ pprString tycon
where
tyvars = TyCon.tyConTyVars tycon
- subst = CoreSubst.extendTvSubstList CoreSubst.emptySubst (zip tyvars args)
\ No newline at end of file
+ subst = CoreSubst.extendTvSubstList CoreSubst.emptySubst (zip tyvars args)
projects / matthijs / master-project / cλash.git / blobdiff