import qualified Type
import qualified Name
import qualified Maybe
+import qualified Control.Arrow as Arrow
import qualified DataCon
import qualified CoreUtils
+import qualified Data.Traversable as Traversable
+import qualified Data.Foldable as Foldable
import Control.Applicative
import Outputable ( showSDoc, ppr )
import qualified Control.Monad.State as State
Type.Type
-> FlattenState (SignalMap UnnamedSignal)
-genSignals ty = do
- typeMapToUseMap tymap
- where
- -- First generate a map with the right structure containing the types
- tymap = mkHsValueMap ty
-
-typeMapToUseMap ::
- HsValueMap Type.Type
- -> FlattenState (SignalMap UnnamedSignal)
+genSignals ty =
+ -- First generate a map with the right structure containing the types, and
+ -- generate signals for each of them.
+ Traversable.mapM (\ty -> genSignalId SigInternal ty) (mkHsValueMap ty)
-typeMapToUseMap (Single ty) = do
- id <- genSignalId
- return $ Single id
+-- | Marks a signal as the given SigUse, if its id is in the list of id's
+-- given.
+markSignals :: SigUse -> [UnnamedSignal] -> (UnnamedSignal, SignalInfo) -> (UnnamedSignal, SignalInfo)
+markSignals use ids (id, info) =
+ (id, info')
+ where
+ info' = if id `elem` ids then info { sigUse = use} else info
-typeMapToUseMap (Tuple tymaps) = do
- usemaps <- State.mapM typeMapToUseMap tymaps
- return $ Tuple usemaps
+markSignal :: SigUse -> UnnamedSignal -> (UnnamedSignal, SignalInfo) -> (UnnamedSignal, SignalInfo)
+markSignal use id = markSignals use [id]
-- | Flatten a haskell function
flattenFunction ::
flattenFunction _ (Rec _) = error "Recursive binders not supported"
flattenFunction hsfunc bind@(NonRec var expr) =
- FlatFunction args res apps conds []
+ FlatFunction args res apps conds sigs''''
where
- init_state = ([], [], 0)
+ init_state = ([], [], [], 0)
(fres, end_state) = State.runState (flattenExpr [] expr) init_state
+ (apps, conds, sigs, _) = end_state
(args, res) = fres
- (apps, conds, _) = end_state
+ arg_ports = concat (map Foldable.toList args)
+ res_ports = Foldable.toList res
+ -- Mark args and result signals as input and output ports resp.
+ sigs' = fmap (markSignals SigPortIn arg_ports) sigs
+ sigs'' = fmap (markSignals SigPortOut res_ports) sigs'
+ -- Mark args and result states as old and new state resp.
+ args_states = concat $ zipWith stateList (hsFuncArgs hsfunc) args
+ sigs''' = foldl (\s (num, id) -> map (markSignal (SigStateOld num) id) s) sigs'' args_states
+ res_states = stateList (hsFuncRes hsfunc) res
+ sigs'''' = foldl (\s (num, id) -> map (markSignal (SigStateNew num) id) s) sigs''' res_states
flattenExpr ::
BindMap
hsargs = map (useAsPort . mkHsValueMap . CoreUtils.exprType) args
hsres = useAsPort (mkHsValueMap ty)
+-- | Filters non-state signals and returns the state number and signal id for
+-- state values.
+filterState ::
+ UnnamedSignal -- | The signal id to look at
+ -> HsValueUse -- | How is this signal used?
+ -> Maybe (Int, UnnamedSignal ) -- | The state num and signal id, if this
+ -- signal was used as state
+
+filterState id (State num) =
+ Just (num, id)
+filterState _ _ = Nothing
+
+-- | Returns a list of the state number and signal id of all used-as-state
+-- signals in the given maps.
+stateList ::
+ HsUseMap
+ -> (SignalMap UnnamedSignal)
+ -> [(Int, UnnamedSignal)]
+
+stateList uses signals =
+ Maybe.catMaybes $ Foldable.toList $ zipValueMapsWith filterState signals uses
+
+-- | Returns pairs of signals that should be mapped to state in this function.
+getOwnStates ::
+ HsFunction -- | The function to look at
+ -> FlatFunction -- | The function to look at
+ -> [(Int, SignalInfo, SignalInfo)]
+ -- | 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.
+
+getOwnStates hsfunc flatfunc =
+ [(old_num, old_info, new_info)
+ | (old_num, old_info) <- args_states
+ , (new_num, new_info) <- res_states
+ , old_num == new_num]
+ where
+ 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)
+ -- Replace the second tuple element with the corresponding SignalInfo
+ args_states = map (Arrow.second $ signalInfo sigs) args
+ res_states = map (Arrow.second $ signalInfo sigs) res
+
+
-- vim: set ts=8 sw=2 sts=2 expandtab: