X-Git-Url: https://git.stderr.nl/gitweb?a=blobdiff_plain;f=Translator.hs;h=550b4f0800475b348d4a6146aa317527d74af79d;hb=998e440a7fa765685e1ed500c871058a33129b1f;hp=fa5802823939d34ee77ac9cfc05c7ac3723a7177;hpb=9167228f9fafba958723fa5a450b5966027127df;p=matthijs%2Fmaster-project%2Fc%CE%BBash.git diff --git a/Translator.hs b/Translator.hs index fa58028..550b4f0 100644 --- a/Translator.hs +++ b/Translator.hs @@ -1,359 +1,355 @@ -module Main(main) where -import GHC +module Translator where +import qualified Directory +import qualified List +import GHC hiding (loadModule, sigName) import CoreSyn import qualified CoreUtils import qualified Var import qualified Type import qualified TyCon import qualified DataCon +import qualified HscMain +import qualified SrcLoc +import qualified FastString import qualified Maybe import qualified Module -import qualified Control.Monad.State as State +import qualified Data.Foldable as Foldable +import qualified Control.Monad.Trans.State as State import Name +import qualified Data.Map as Map +import Data.Accessor import Data.Generics import NameEnv ( lookupNameEnv ) +import qualified HscTypes import HscTypes ( cm_binds, cm_types ) import MonadUtils ( liftIO ) import Outputable ( showSDoc, ppr ) import GHC.Paths ( libdir ) import DynFlags ( defaultDynFlags ) import List ( find ) +import qualified List +import qualified Monad + -- The following modules come from the ForSyDe project. They are really -- internal modules, so ForSyDe.cabal has to be modified prior to installing -- ForSyDe to get access to these modules. import qualified ForSyDe.Backend.VHDL.AST as AST import qualified ForSyDe.Backend.VHDL.Ppr +import qualified ForSyDe.Backend.VHDL.FileIO import qualified ForSyDe.Backend.Ppr -- This is needed for rendering the pretty printed VHDL import Text.PrettyPrint.HughesPJ (render) -main = - do - defaultErrorHandler defaultDynFlags $ do - runGhc (Just libdir) $ do - dflags <- getSessionDynFlags - setSessionDynFlags dflags - --target <- guessTarget "adder.hs" Nothing - --liftIO (print (showSDoc (ppr (target)))) - --liftIO $ printTarget target - --setTargets [target] - --load LoadAllTargets - --core <- GHC.compileToCoreSimplified "Adders.hs" - core <- GHC.compileToCoreSimplified "Adders.hs" - liftIO $ printBinds (cm_binds core) - let bind = findBind "half_adder" (cm_binds core) - let NonRec var expr = bind - -- Turn bind into VHDL - let vhdl = State.evalState (mkVHDL bind) (VHDLSession 0 builtin_funcs) - liftIO $ putStr $ showSDoc $ ppr expr - liftIO $ putStr "\n\n" - liftIO $ putStr $ render $ ForSyDe.Backend.Ppr.ppr $ vhdl - return expr +import TranslatorTypes +import HsValueMap +import Pretty +import Flatten +import FlattenTypes +import VHDLTypes +import qualified VHDL + +-- main = do +-- makeVHDL "Alu.hs" "exec" True + +makeVHDL :: String -> String -> Bool -> IO () +makeVHDL filename name stateful = do + -- Load the module + core <- loadModule filename + -- Translate to VHDL + vhdl <- moduleToVHDL core [(name, stateful)] + -- Write VHDL to file + let dir = "../vhdl/vhdl/" ++ name ++ "/" + mapM (writeVHDL dir) vhdl + return () + +-- | Show the core structure of the given binds in the given file. +listBind :: String -> String -> IO () +listBind filename name = do + core <- loadModule filename + let [(b, expr)] = findBinds core [name] + putStr "\n" + putStr $ prettyShow expr + putStr "\n\n" + putStr $ showSDoc $ ppr expr + putStr "\n\n" + putStr $ showSDoc $ ppr $ CoreUtils.exprType expr + putStr "\n\n" + +-- | Translate the binds with the given names from the given core module to +-- VHDL. The Bool in the tuple makes the function stateful (True) or +-- stateless (False). +moduleToVHDL :: HscTypes.CoreModule -> [(String, Bool)] -> IO [(AST.VHDLId, AST.DesignFile)] +moduleToVHDL core list = do + let (names, statefuls) = unzip list + --liftIO $ putStr $ prettyShow (cm_binds core) + let binds = findBinds core names + --putStr $ prettyShow binds + -- Turn bind into VHDL + let (vhdl, sess) = State.runState (mkVHDL binds statefuls) (TranslatorSession core 0 Map.empty) + mapM (putStr . render . ForSyDe.Backend.Ppr.ppr . snd) vhdl + putStr $ "\n\nFinal session:\n" ++ prettyShow sess ++ "\n\n" + return vhdl where -- Turns the given bind into VHDL - mkVHDL bind = do - -- Get the function signature - (name, f) <- mkHWFunction bind - -- Add it to the session - addFunc name f - arch <- getArchitecture bind - return arch - -printTarget (Target (TargetFile file (Just x)) obj Nothing) = - print $ show file - -printBinds [] = putStr "done\n\n" -printBinds (b:bs) = do - printBind b - putStr "\n" - printBinds bs - -printBind (NonRec b expr) = do - putStr "NonRec: " - printBind' (b, expr) - -printBind (Rec binds) = do - putStr "Rec: \n" - foldl1 (>>) (map printBind' binds) - -printBind' (b, expr) = do - putStr $ getOccString b - --putStr $ showSDoc $ ppr expr - putStr "\n" - -findBind :: String -> [CoreBind] -> CoreBind -findBind lookfor = + mkVHDL :: [(CoreBndr, CoreExpr)] -> [Bool] -> TranslatorState [(AST.VHDLId, AST.DesignFile)] + mkVHDL binds statefuls = do + -- Add the builtin functions + --mapM addBuiltIn builtin_funcs + -- Create entities and architectures for them + Monad.zipWithM processBind statefuls binds + modA tsFlatFuncs (Map.map nameFlatFunction) + flatfuncs <- getA tsFlatFuncs + return $ VHDL.createDesignFiles flatfuncs + +-- | Write the given design file to a file with the given name inside the +-- given dir +writeVHDL :: String -> (AST.VHDLId, AST.DesignFile) -> IO () +writeVHDL dir (name, vhdl) = do + -- Create the dir if needed + exists <- Directory.doesDirectoryExist dir + Monad.unless exists $ Directory.createDirectory dir + -- Find the filename + let fname = dir ++ (AST.fromVHDLId name) ++ ".vhdl" + -- Write the file + ForSyDe.Backend.VHDL.FileIO.writeDesignFile vhdl fname + +-- | Loads the given file and turns it into a core module. +loadModule :: String -> IO HscTypes.CoreModule +loadModule filename = + defaultErrorHandler defaultDynFlags $ do + runGhc (Just libdir) $ do + dflags <- getSessionDynFlags + setSessionDynFlags dflags + --target <- guessTarget "adder.hs" Nothing + --liftIO (print (showSDoc (ppr (target)))) + --liftIO $ printTarget target + --setTargets [target] + --load LoadAllTargets + --core <- GHC.compileToCoreSimplified "Adders.hs" + core <- GHC.compileToCoreSimplified filename + return core + +-- | Extracts the named binds from the given module. +findBinds :: HscTypes.CoreModule -> [String] -> [(CoreBndr, CoreExpr)] +findBinds core names = Maybe.mapMaybe (findBind (CoreSyn.flattenBinds $ cm_binds core)) names + +-- | Extract a named bind from the given list of binds +findBind :: [(CoreBndr, CoreExpr)] -> String -> Maybe (CoreBndr, CoreExpr) +findBind binds lookfor = -- This ignores Recs and compares the name of the bind with lookfor, -- disregarding any namespaces in OccName and extra attributes in Name and -- Var. - Maybe.fromJust . find (\b -> case b of - Rec l -> False - NonRec var _ -> lookfor == (occNameString $ nameOccName $ getName var) - ) - -getPortMapEntry :: - SignalNameMap String -- The port name to bind to - -> AST.VHDLName -- The signal or port to bind to it - -> AST.AssocElem -- The resulting port map entry - --- Accepts a port name and an argument to map to it. --- Returns the appropriate line for in the port map -getPortMapEntry (Signal portname) signame = - (Just (AST.unsafeVHDLBasicId portname)) AST.:=>: (AST.ADName signame) - -getInstantiations :: - [SignalNameMap String] -- The arguments that need to be applied to the - -- expression. - -> SignalNameMap String -- The output ports that the expression should generate. - -> [(CoreBndr, SignalNameMap String)] - -- A list of bindings in effect - -> CoreSyn.CoreExpr -- The expression to generate an architecture for - -> VHDLState ([AST.SigDec], [AST.ConcSm]) - -- The resulting VHDL code - --- A lambda expression binds the first argument (a) to the binder b. -getInstantiations (a:as) outs binds (Lam b expr) = - getInstantiations 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 -getInstantiations args outs binds (Case (Var v) b _ [res]) = - -- Split out the type of alternative constructor, the variables it binds - -- and the expression to evaluate with the variables bound. - let (altcon, bind_vars, expr) = res in - case altcon of - DataAlt datacon -> - if (DataCon.isTupleCon datacon) then - let - -- Lookup the scrutinee (which must be a variable bound to a tuple) in - -- the existing bindings list and get the portname map for each of - -- it's elements. - Tuple tuple_ports = Maybe.fromMaybe - (error $ "Case expression uses unknown scrutinee " ++ getOccString v) - (lookup v binds) - -- Merge our existing binds with the new binds. - binds' = (zip bind_vars tuple_ports) ++ binds - in - -- Evaluate the expression with the new binds list - getInstantiations args outs binds' expr - else - error "Data constructors other than tuples not supported" - otherwise -> - error "Case binders other than tuples not supported" - --- An application is an instantiation of a component -getInstantiations args outs binds app@(App expr arg) = do - let ((Var f), fargs) = collectArgs app - name = getOccString f - if isTupleConstructor f - then do - -- Get the signals we should bind our results to - let Tuple outports = outs - -- Split the tuple constructor arguments into types and actual values. - let (_, vals) = splitTupleConstructorArgs fargs - -- Bind each argument to each output signal - res <- sequence $ zipWith - (\outs' expr' -> getInstantiations args outs' binds expr') - outports vals - -- res is a list of pairs of lists, so split out the signals and - -- components into separate lists of lists - let (sigs, comps) = unzip res - -- And join all the signals and component instantiations together - return $ (concat sigs, concat comps) - else do - -- This is an normal function application, which maps to a component - -- instantiation. - -- Lookup the hwfunction to instantiate - HWFunction inports outport <- getHWFunc name - -- Generate a unique name for the application - appname <- uniqueName "app" - -- Expand each argument to a signal or port name, possibly generating - -- new signals and component instantiations - (sigs, comps, args) <- expandArgs binds fargs - -- Bind each of the input ports to the expanded signal or port - let inmaps = zipWith getPortMapEntry inports args - -- Bind each of the output ports to our output signals - let outmaps = mapOutputPorts outport outs - -- Build and return a component instantiation - let comp = AST.CompInsSm - (AST.unsafeVHDLBasicId appname) - (AST.IUEntity (AST.NSimple (AST.unsafeVHDLBasicId name))) - (AST.PMapAspect (inmaps ++ outmaps)) - return (sigs, (AST.CSISm comp) : comps) - -getInstantiations args outs binds expr = - error $ "Unsupported expression" ++ (showSDoc $ ppr $ expr) - -expandArgs :: - [(CoreBndr, SignalNameMap String)] -- A list of bindings in effect - -> [CoreExpr] -- The arguments to expand - -> VHDLState ([AST.SigDec], [AST.ConcSm], [AST.VHDLName]) - -- The resulting signal declarations, - -- component instantiations and a - -- VHDLName for each of the - -- expressions passed in. -expandArgs binds (e:exprs) = do - -- Expand the first expression - arg <- case e of - -- A simple variable reference should be in our binds map - Var id -> return $ let - -- Lookup the id in our binds map - Signal signalname = Maybe.fromMaybe - (error $ "Argument " ++ getOccString id ++ "is unknown") - (lookup id binds) - in - -- Create a VHDL name from the signal name - AST.NSimple (AST.unsafeVHDLBasicId signalname) - -- Other expressions are unsupported - otherwise -> error ("Unsupported expression used as argument: " ++ (showSDoc $ ppr e)) - -- Expand the rest - (sigs, comps, args) <- expandArgs binds exprs - -- Return all results - return (sigs, comps, arg:args) - -expandArgs _ [] = return ([], [], []) - --- Is the given name a (binary) tuple constructor -isTupleConstructor :: Var.Var -> Bool -isTupleConstructor var = - Name.isWiredInName name - && Name.nameModule name == tuple_mod - && (Name.occNameString $ Name.nameOccName name) == "(,)" + find (\(var, _) -> lookfor == (occNameString $ nameOccName $ getName var)) binds + +-- | Processes the given bind as a top level bind. +processBind :: + Bool -- ^ Should this be stateful function? + -> (CoreBndr, CoreExpr) -- ^ The bind to process + -> TranslatorState () + +processBind stateful bind@(var, expr) = do + -- Create the function signature + let ty = CoreUtils.exprType expr + let hsfunc = mkHsFunction var ty stateful + flattenBind hsfunc bind + +-- | Flattens the given bind into the given signature and adds it to the +-- session. Then (recursively) finds any functions it uses and does the same +-- with them. +flattenBind :: + HsFunction -- The signature to flatten into + -> (CoreBndr, CoreExpr) -- The bind to flatten + -> TranslatorState () + +flattenBind hsfunc bind@(var, expr) = do + -- Flatten the function + let flatfunc = flattenFunction hsfunc bind + -- Propagate state variables + let flatfunc' = propagateState hsfunc flatfunc + -- Store the flat function in the session + modA tsFlatFuncs (Map.insert hsfunc flatfunc') + -- Flatten any functions used + let used_hsfuncs = Maybe.mapMaybe usedHsFunc (flat_defs flatfunc') + mapM_ resolvFunc used_hsfuncs + +-- | Decide which incoming state variables will become state in the +-- given function, and which will be propagate to other applied +-- functions. +propagateState :: + HsFunction + -> FlatFunction + -> FlatFunction + +propagateState hsfunc flatfunc = + flatfunc {flat_defs = apps', flat_sigs = sigs'} where - name = Var.varName var - mod = nameModule name - tuple_mod = Module.mkModule (Module.stringToPackageId "ghc-prim") (Module.mkModuleName "GHC.Tuple") - --- Split arguments into type arguments and value arguments This is probably --- not really sufficient (not sure if Types can actually occur as value --- arguments...) -splitTupleConstructorArgs :: [CoreExpr] -> ([CoreExpr], [CoreExpr]) -splitTupleConstructorArgs (e:es) = - case e of - Type t -> (e:tys, vals) - otherwise -> (tys, e:vals) + (olds, news) = unzip $ getStateSignals hsfunc flatfunc + states' = zip olds news + -- Find all signals used by all sigdefs + uses = concatMap sigDefUses (flat_defs flatfunc) + -- Find all signals that are used more than once (is there a + -- prettier way to do this?) + multiple_uses = uses List.\\ (List.nub uses) + -- Find the states whose "old state" signal is used only once + single_use_states = filter ((`notElem` multiple_uses) . fst) states' + -- See if these single use states can be propagated + (substate_sigss, apps') = unzip $ map (propagateState' single_use_states) (flat_defs flatfunc) + substate_sigs = concat substate_sigss + -- Mark any propagated state signals as SigSubState + sigs' = map + (\(id, info) -> (id, if id `elem` substate_sigs then info {sigUse = SigSubState} else info)) + (flat_sigs flatfunc) + +-- | Propagate the state into a single function application. +propagateState' :: + [(SignalId, SignalId)] + -- ^ TODO + -> SigDef -- ^ The SigDef to process. + -> ([SignalId], SigDef) + -- ^ Any signal ids that should become substates, + -- and the resulting application. + +propagateState' states def = + if (is_FApp def) then + (our_old ++ our_new, def {appFunc = hsfunc'}) + else + ([], def) where - (tys, vals) = splitTupleConstructorArgs es - -mapOutputPorts :: - SignalNameMap String -- The output portnames of the component - -> SignalNameMap String -- The output portnames and/or signals to map these to - -> [AST.AssocElem] -- The resulting output ports - --- Map the output port of a component to the output port of the containing --- entity. -mapOutputPorts (Signal portname) (Signal signalname) = - [(Just (AST.unsafeVHDLBasicId portname)) AST.:=>: (AST.ADName (AST.NSimple (AST.unsafeVHDLBasicId signalname)))] - --- Map matching output ports in the tuple -mapOutputPorts (Tuple ports) (Tuple signals) = - concat (zipWith mapOutputPorts ports signals) - -getArchitecture :: - CoreBind -- The binder to expand into an architecture - -> VHDLState AST.ArchBody -- The resulting architecture - -getArchitecture (Rec _) = error "Recursive binders not supported" - -getArchitecture (NonRec var expr) = do - let name = (getOccString var) - HWFunction inports outport <- getHWFunc name - sess <- State.get - (sigs, comps) <- getInstantiations inports outport [] expr - return $ AST.ArchBody - (AST.unsafeVHDLBasicId "structural") - -- Use unsafe for now, to prevent pulling in ForSyDe error handling - (AST.NSimple (AST.unsafeVHDLBasicId name)) - (map AST.BDISD sigs) - comps - -data SignalNameMap t = - Tuple [SignalNameMap t] - | Signal t - deriving (Show) - --- Generate a port name map (or multiple for tuple types) in the given direction for --- each type given. -getPortNameMapForTys :: String -> Int -> [Type] -> [SignalNameMap String] -getPortNameMapForTys prefix num [] = [] -getPortNameMapForTys prefix num (t:ts) = - (getPortNameMapForTy (prefix ++ show num) t) : getPortNameMapForTys prefix (num + 1) ts - -getPortNameMapForTy :: String -> Type -> SignalNameMap String -getPortNameMapForTy name ty = - if (TyCon.isTupleTyCon tycon) then - -- Expand tuples we find - Tuple (getPortNameMapForTys name 0 args) - else -- Assume it's a type constructor application, ie simple data type - -- TODO: Add type? - Signal name + hsfunc = appFunc def + args = appArgs def + res = appRes def + our_states = filter our_state states + -- A state signal belongs in this function if the old state is + -- passed in, and the new state returned + our_state (old, new) = + any (old `Foldable.elem`) args + && new `Foldable.elem` res + (our_old, our_new) = unzip our_states + -- Mark the result + zipped_res = zipValueMaps res (hsFuncRes hsfunc) + res' = fmap (mark_state (zip our_new [0..])) zipped_res + -- Mark the args + zipped_args = zipWith zipValueMaps args (hsFuncArgs hsfunc) + args' = map (fmap (mark_state (zip our_old [0..]))) zipped_args + hsfunc' = hsfunc {hsFuncArgs = args', hsFuncRes = res'} + + mark_state :: [(SignalId, StateId)] -> (SignalId, HsValueUse) -> HsValueUse + mark_state states (id, use) = + case lookup id states of + Nothing -> use + Just state_id -> State state_id + +-- | Returns pairs of signals that should be mapped to state in this function. +getStateSignals :: + HsFunction -- | The function to look at + -> FlatFunction -- | The function to look at + -> [(SignalId, SignalId)] + -- | TODO The state signals. The first is the state number, the second the + -- signal to assign the current state to, the last is the signal + -- that holds the new state. + +getStateSignals hsfunc flatfunc = + [(old_id, new_id) + | (old_num, old_id) <- args + , (new_num, new_id) <- res + , old_num == new_num] where - (tycon, args) = Type.splitTyConApp ty - -data HWFunction = HWFunction { -- A function that is available in hardware - inPorts :: [SignalNameMap String], - outPort :: SignalNameMap String - --entity :: AST.EntityDec -} deriving (Show) - --- Turns a CoreExpr describing a function into a description of its input and --- output ports. -mkHWFunction :: - CoreBind -- The core binder to generate the interface for - -> VHDLState (String, HWFunction) -- The name of the function and its interface - -mkHWFunction (NonRec var expr) = - return (name, HWFunction inports outport) + sigs = flat_sigs flatfunc + -- Translate args and res to lists of (statenum, sigid) + args = concat $ zipWith stateList (hsFuncArgs hsfunc) (flat_args flatfunc) + res = stateList (hsFuncRes hsfunc) (flat_res flatfunc) + +-- | Find the given function, flatten it and add it to the session. Then +-- (recursively) do the same for any functions used. +resolvFunc :: + HsFunction -- | The function to look for + -> TranslatorState () + +resolvFunc hsfunc = do + flatfuncmap <- getA tsFlatFuncs + -- Don't do anything if there is already a flat function for this hsfunc or + -- when it is a builtin function. + Monad.unless (Map.member hsfunc flatfuncmap) $ do + Monad.unless (elem hsfunc VHDL.builtin_hsfuncs) $ do + -- New function, resolve it + core <- getA tsCoreModule + -- Find the named function + let name = (hsFuncName hsfunc) + let bind = findBind (CoreSyn.flattenBinds $ cm_binds core) name + case bind of + Nothing -> error $ "Couldn't find function " ++ name ++ " in current module." + Just b -> flattenBind hsfunc b + +-- | Translate a top level function declaration to a HsFunction. i.e., which +-- interface will be provided by this function. This function essentially +-- defines the "calling convention" for hardware models. +mkHsFunction :: + Var.Var -- ^ The function defined + -> Type -- ^ The function type (including arguments!) + -> Bool -- ^ Is this a stateful function? + -> HsFunction -- ^ The resulting HsFunction + +mkHsFunction f ty stateful= + HsFunction hsname hsargs hsres 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 (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) - -type VHDLState = State.State VHDLSession - --- Add the function to the session -addFunc :: String -> HWFunction -> VHDLState () -addFunc name f = do - fs <- State.gets funcs -- Get the funcs element from the session - State.modify (\x -> x {funcs = (name, f) : fs }) -- Prepend name and f - --- Lookup the function with the given name in the current session. Errors if --- it was not found. -getHWFunc :: String -> VHDLState HWFunction -getHWFunc name = do - fs <- State.gets funcs -- Get the funcs element from the session - return $ Maybe.fromMaybe - (error $ "Function " ++ name ++ "is unknown? This should not happen!") - (lookup name fs) - --- Makes the given name unique by appending a unique number. --- This does not do any checking against existing names, so it only guarantees --- uniqueness with other names generated by uniqueName. -uniqueName :: String -> VHDLState String -uniqueName name = do - count <- State.gets nameCount -- Get the funcs element from the session - State.modify (\s -> s {nameCount = count + 1}) - return $ name ++ "-" ++ (show count) - -builtin_funcs = - [ - ("hwxor", HWFunction [Signal "a", Signal "b"] (Signal "o")), - ("hwand", HWFunction [Signal "a", Signal "b"] (Signal "o")) - ] + hsname = getOccString f + (arg_tys, res_ty) = Type.splitFunTys ty + (hsargs, hsres) = + if stateful + then + let + -- The last argument must be state + state_ty = last arg_tys + state = useAsState (mkHsValueMap state_ty) + -- All but the last argument are inports + inports = map (useAsPort . mkHsValueMap)(init arg_tys) + hsargs = inports ++ [state] + hsres = case splitTupleType res_ty of + -- Result type must be a two tuple (state, ports) + Just [outstate_ty, outport_ty] -> if Type.coreEqType state_ty outstate_ty + then + Tuple [state, useAsPort (mkHsValueMap outport_ty)] + else + error $ "Input state type of function " ++ hsname ++ ": " ++ (showSDoc $ ppr state_ty) ++ " does not match output state type: " ++ (showSDoc $ ppr outstate_ty) + otherwise -> error $ "Return type of top-level function " ++ hsname ++ " must be a two-tuple containing a state and output ports." + in + (hsargs, hsres) + else + -- Just use everything as a port + (map (useAsPort . mkHsValueMap) arg_tys, useAsPort $ mkHsValueMap res_ty) + +-- | Adds signal names to the given FlatFunction +nameFlatFunction :: + FlatFunction + -> FlatFunction + +nameFlatFunction flatfunc = + -- Name the signals + let + s = flat_sigs flatfunc + s' = map nameSignal s in + flatfunc { flat_sigs = s' } + where + nameSignal :: (SignalId, SignalInfo) -> (SignalId, SignalInfo) + nameSignal (id, info) = + let hints = nameHints info in + let parts = ("sig" : hints) ++ [show id] in + let name = concat $ List.intersperse "_" parts in + (id, info {sigName = Just name}) + +-- | Splits a tuple type into a list of element types, or Nothing if the type +-- is not a tuple type. +splitTupleType :: + Type -- ^ The type to split + -> Maybe [Type] -- ^ The tuples element types + +splitTupleType ty = + case Type.splitTyConApp_maybe ty of + Just (tycon, args) -> if TyCon.isTupleTyCon tycon + then + Just args + else + Nothing + Nothing -> Nothing -- vim: set ts=8 sw=2 sts=2 expandtab: