Add clk port on any stateful entity.

[matthijs/master-project/cλash.git] / FlattenTypes.hs

diff --git a/FlattenTypes.hs b/FlattenTypes.hs
index e77a8aaf3c5e01841f91fa169a5ab205585f322b..e7d21d605c5fec8901e9ad104cb4f92f8f3c3849 100644 (file)
--- a/FlattenTypes.hs
+++ b/FlattenTypes.hs
@@ -1,6 +1,7 @@
 module FlattenTypes where
 
 import Data.Traversable
+import qualified Data.Foldable as Foldable
 import qualified Control.Monad.State as State
 
 import CoreSyn
@@ -28,6 +29,11 @@ data HsValueUse =
   }
   deriving (Show, Eq, Ord)
 
+-- | Is this HsValueUse a state use?
+isStateUse :: HsValueUse -> Bool
+isStateUse (State _) = True
+isStateUse _         = False
+
 -- | A map from a Haskell value to the use of each single value
 type HsUseMap = HsValueMap HsValueUse
 
@@ -60,6 +66,11 @@ data HsFunction = HsFunction {
   hsFuncRes  :: HsUseMap
 } deriving (Show, Eq, Ord)
 
+hasState :: HsFunction -> Bool
+hasState hsfunc = 
+  any (Foldable.any isStateUse) (hsFuncArgs hsfunc)
+  || Foldable.any isStateUse (hsFuncRes hsfunc)
+
 -- | A flattened function application
 data FApp sigid = FApp {
   appFunc :: HsFunction,
@@ -75,9 +86,17 @@ data CondDef sigid = CondDef {
   condRes :: sigid
 } deriving (Show, Eq)
 
+-- | How is a given signal used in the resulting VHDL?
+data SigUse = 
+  SigPort         -- | Use as a port
+  | SigInternal   -- | Use as an internal signal
+  | SigState      -- | Use as an internal state
+  | SigSubState   -- | Do not use, state variable is used in a subcircuit
+
 -- | Information on a signal definition
 data SignalInfo = SignalInfo {
   sigName :: Maybe String,
+  sigUse  :: SigUse,
   sigTy   :: Type.Type
 }
 
@@ -121,10 +140,10 @@ addCondDef c = do
   State.put (apps, c:conds, sigs, n)
 
 -- | Generates a new signal id, which is unique within the current flattening.
-genSignalId :: Type.Type -> FlattenState UnnamedSignal 
-genSignalId ty = do
+genSignalId :: SigUse -> Type.Type -> FlattenState UnnamedSignal 
+genSignalId use ty = do
   (apps, conds, sigs, n) <- State.get
   -- Generate a new numbered but unnamed signal
-  let s = (n, SignalInfo Nothing ty)
+  let s = (n, SignalInfo Nothing use ty)
   State.put (apps, conds, s:sigs, n+1)
   return n