Allow name hints to be set for a signal.

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

diff --git a/FlattenTypes.hs b/FlattenTypes.hs
index c7e0c1e79e6eca5c771c455052b2860b467ca870..d0076636bdcd07e266215b74e92e875e4f547e17 100644 (file)
--- a/FlattenTypes.hs
+++ b/FlattenTypes.hs
@@ -99,6 +99,8 @@ data SigDef =
 -- | An expression on signals
 data SignalExpr = 
   EqLit SignalId String -- ^ Is the given signal equal to the given (VHDL) literal
+  | Literal String -- ^ A literal value
+  | Eq SignalId SignalId -- ^ A comparison between to signals
   deriving (Show, Eq)
 
 -- Returns the function used by the given SigDef, if any
@@ -136,7 +138,8 @@ isInternalSigUse _ = False
 data SignalInfo = SignalInfo {
   sigName :: Maybe String,
   sigUse  :: SigUse,
-  sigTy   :: Type.Type
+  sigTy   :: Type.Type,
+  nameHints :: [String]
 }
 
 -- | A flattened function
@@ -181,10 +184,18 @@ genSignalId :: SigUse -> Type.Type -> FlattenState SignalId
 genSignalId use ty = do
   (defs, sigs, n) <- State.get
   -- Generate a new numbered but unnamed signal
-  let s = (n, SignalInfo Nothing use ty)
+  let s = (n, SignalInfo Nothing use ty [])
   State.put (defs, s:sigs, n+1)
   return n
 
+-- | Add a name hint to the given signal
+addNameHint :: SignalId -> String -> FlattenState ()
+addNameHint id hint = do
+  info <- getSignalInfo id
+  let hints = nameHints info
+  let hints' = (hint:hints)
+  setSignalInfo id (info {nameHints = hints'})
+
 -- | Returns the SignalInfo for the given signal. Errors if the signal is not
 --   known in the session.
 getSignalInfo :: SignalId -> FlattenState SignalInfo