let bind = findBind "half_adder" (cm_binds core)
let NonRec var expr = bind
let sess = VHDLSession 0 builtin_funcs
+ let (sess', name, f) = mkHWFunction sess bind
+ let sess = addFunc sess' name f
liftIO $ putStr $ showSDoc $ ppr expr
liftIO $ putStr "\n\n"
liftIO $ putStr $ render $ ForSyDe.Backend.Ppr.ppr $ getArchitecture sess bind
getInstantiations ::
VHDLSession
- -> PortNameMap -- The arguments that need to be applied to the
- -- expression. Should always be the Args
- -- constructor.
+ -> [PortNameMap] -- The arguments that need to be applied to the
+ -- expression.
-> PortNameMap -- The output ports that the expression should generate.
-> [(CoreBndr, PortNameMap)] -- A list of bindings in effect
-> CoreSyn.CoreExpr -- The expression to generate an architecture for
-> [AST.ConcSm] -- The resulting VHDL code
-- A lambda expression binds the first argument (a) to the binder b.
-getInstantiations sess (Args (a:as)) outs binds (Lam b expr) =
- getInstantiations sess (Args as) outs ((b, a):binds) expr
+getInstantiations sess (a:as) outs binds (Lam b expr) =
+ getInstantiations sess as outs ((b, a):binds) expr
-- A case expression that checks a single variable and has a single
-- alternative, can be used to take tuples apart
hwfunc = Maybe.fromMaybe
(error $ "Function " ++ compname ++ "is unknown")
(lookup compname (funcs sess))
- HWFunction (Args inports) outport = hwfunc
+ HWFunction inports outport = hwfunc
ports =
zipWith (getPortMapEntry binds) inports fargs
++ mapOutputPorts outport outs
-- Use unsafe for now, to prevent pulling in ForSyDe error handling
(AST.NSimple (AST.unsafeVHDLBasicId name))
[]
- (getInstantiations sess (Args inportnames) outport [] expr)
+ (getInstantiations sess inports outport [] expr)
where
name = (getOccString var)
- ty = CoreUtils.exprType expr
- (fargs, res) = Type.splitFunTys ty
- --state = if length fargs == 1 then () else (last fargs)
- ports = if length fargs == 1 then fargs else (init fargs)
- inportnames = case ports of
- [port] -> [getPortNameMapForTy "portin" port]
- ps -> getPortNameMapForTys "portin" 0 ps
- outport = getPortNameMapForTy "portout" res
+ hwfunc = Maybe.fromMaybe
+ (error $ "Function " ++ name ++ "is unknown? This should not happen!")
+ (lookup name (funcs sess))
+ HWFunction inports outport = hwfunc
data PortNameMap =
- Args [PortNameMap] -- Each of the submaps represent an argument to the
- -- function. Should only occur at top level.
- | Tuple [PortNameMap]
+ Tuple [PortNameMap]
| Port String
+ deriving (Show)
-- Generate a port name map (or multiple for tuple types) in the given direction for
-- each type given.
(tycon, args) = Type.splitTyConApp ty
data HWFunction = HWFunction { -- A function that is available in hardware
- inPorts :: PortNameMap,
- outPorts :: PortNameMap
+ inPorts :: [PortNameMap],
+ outPort :: PortNameMap
--entity :: AST.EntityDec
-}
+} deriving (Show)
+
+-- Turns a CoreExpr describing a function into a description of its input and
+-- output ports.
+mkHWFunction ::
+ VHDLSession
+ -> CoreBind -- The core binder to generate the interface for
+ -> (VHDLSession, String, HWFunction) -- The name of the function and its interface
+
+mkHWFunction sess (NonRec var expr) =
+ (sess, name, HWFunction inports outport)
+ where
+ name = (getOccString var)
+ ty = CoreUtils.exprType expr
+ (fargs, res) = Type.splitFunTys ty
+ args = if length fargs == 1 then fargs else (init fargs)
+ --state = if length fargs == 1 then () else (last fargs)
+ inports = case args of
+ -- Handle a single port specially, to prevent an extra 0 in the name
+ [port] -> [getPortNameMapForTy "portin" port]
+ ps -> getPortNameMapForTys "portin" 0 ps
+ outport = getPortNameMapForTy "portout" res
+
+mkHWFunction sess (Rec _) =
+ error "Recursive binders not supported"
data VHDLSession = VHDLSession {
nameCount :: Int, -- A counter that can be used to generate unique names
funcs :: [(String, HWFunction)] -- All functions available, indexed by name
-}
+} deriving (Show)
+
+-- Add the function to the session
+addFunc :: VHDLSession -> String -> HWFunction -> VHDLSession
+addFunc sess name f =
+ sess {funcs = (name, f) : (funcs sess) }
builtin_funcs =
[
- ("hwxor", HWFunction (Args [Port "a", Port "b"]) (Port "o")),
- ("hwand", HWFunction (Args [Port "a", Port "b"]) (Port "o"))
+ ("hwxor", HWFunction [Port "a", Port "b"] (Port "o")),
+ ("hwand", HWFunction [Port "a", Port "b"] (Port "o"))
]