X-Git-Url: https://git.stderr.nl/gitweb?a=blobdiff_plain;f=FlattenTypes.hs;h=092baff4911fdcb6789399ec613c09293fe30f02;hb=9b7d00ad53acfc821840051ef693d87470b4462b;hp=409c2ac249970f3e1f12593bdfb7431977a40a67;hpb=ed9f3e71c71db41d85a9dabb3a676f4c342b8266;p=matthijs%2Fmaster-project%2Fc%CE%BBash.git

diff --git a/FlattenTypes.hs b/FlattenTypes.hs
index 409c2ac..092baff 100644
--- a/FlattenTypes.hs
+++ b/FlattenTypes.hs
@@ -20,7 +20,7 @@ type SignalMap = HsValueMap SignalId
 type StateId = Int
 
 -- | How is a given (single) value in a function's type (ie, argument or
--- return value) used?
+--   return value) used?
 data HsValueUse = 
   Port           -- ^ Use it as a port (input or output)
   | State StateId -- ^ Use it as state (input or output). The int is used to
@@ -75,20 +75,38 @@ hasState hsfunc =
   any (Foldable.any isStateUse) (hsFuncArgs hsfunc)
   || Foldable.any isStateUse (hsFuncRes hsfunc)
 
--- | A flattened function application
-data FApp = FApp {
-  appFunc :: HsFunction,
-  appArgs :: [SignalMap],
-  appRes  :: SignalMap
-} deriving (Show, Eq)
-
--- | A conditional signal definition
-data CondDef = CondDef {
-  cond    :: SignalId,
-  high    :: SignalId,
-  low     :: SignalId,
-  condRes :: SignalId
-} deriving (Show, Eq)
+-- | Something that defines a signal
+data SigDef =
+  -- | A flattened function application
+  FApp {
+    appFunc :: HsFunction,
+    appArgs :: [SignalMap],
+    appRes  :: SignalMap
+  }
+  -- | A conditional signal definition
+  | CondDef {
+    cond    :: SignalId,
+    high    :: SignalId,
+    low     :: SignalId,
+    condRes :: SignalId
+  }
+  -- | Unconditional signal definition
+  | UncondDef {
+    defSrc :: Either SignalId SignalExpr,
+    defDst :: SignalId
+  } deriving (Show, Eq)
+
+-- | 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
+usedHsFunc :: SigDef -> Maybe HsFunction
+usedHsFunc (FApp hsfunc _ _) = Just hsfunc
+usedHsFunc _ = Nothing
 
 -- | How is a given signal used in the resulting VHDL?
 data SigUse = 
@@ -127,8 +145,7 @@ data SignalInfo = SignalInfo {
 data FlatFunction = FlatFunction {
   flat_args   :: [SignalMap],
   flat_res    :: SignalMap,
-  flat_apps   :: [FApp],
-  flat_conds  :: [CondDef],
+  flat_defs   :: [SigDef],
   flat_sigs   :: [(SignalId, SignalInfo)]
 }
 
@@ -140,6 +157,10 @@ signalInfo sigs id = Maybe.fromJust $ lookup id sigs
 -- | A list of binds in effect at a particular point of evaluation
 type BindMap = [(
   CoreBndr,            -- ^ The bind name
+  BindValue            -- ^ The value bound to it
+  )]
+
+type BindValue =
   Either               -- ^ The bind value which is either
     (SignalMap)
                        -- ^ a signal
@@ -147,28 +168,34 @@ type BindMap = [(
       HsValueUse,      -- ^ or a HighOrder function
       [SignalId]       -- ^ With these signals already applied to it
     )
-  )]
 
 -- | The state during the flattening of a single function
-type FlattenState = State.State ([FApp], [CondDef], [(SignalId, SignalInfo)], SignalId)
+type FlattenState = State.State ([SigDef], [(SignalId, SignalInfo)], SignalId)
 
 -- | Add an application to the current FlattenState
-addApp :: (FApp) -> FlattenState ()
-addApp a = do
-  (apps, conds, sigs, n) <- State.get
-  State.put (a:apps, conds, sigs, n)
-
--- | Add a conditional definition to the current FlattenState
-addCondDef :: (CondDef) -> FlattenState ()
-addCondDef c = do
-  (apps, conds, sigs, n) <- State.get
-  State.put (apps, c:conds, sigs, n)
+addDef :: SigDef -> FlattenState ()
+addDef d = do
+  (defs, sigs, n) <- State.get
+  State.put (d:defs, sigs, n)
 
 -- | Generates a new signal id, which is unique within the current flattening.
 genSignalId :: SigUse -> Type.Type -> FlattenState SignalId 
 genSignalId use ty = do
-  (apps, conds, sigs, n) <- State.get
+  (defs, sigs, n) <- State.get
   -- Generate a new numbered but unnamed signal
   let s = (n, SignalInfo Nothing use ty)
-  State.put (apps, conds, s:sigs, n+1)
+  State.put (defs, s:sigs, n+1)
   return n
+
+-- | Returns the SignalInfo for the given signal. Errors if the signal is not
+--   known in the session.
+getSignalInfo :: SignalId -> FlattenState SignalInfo
+getSignalInfo id = do
+  (defs, sigs, n) <- State.get
+  return $ signalInfo sigs id
+
+setSignalInfo :: SignalId -> SignalInfo -> FlattenState ()
+setSignalInfo id' info' = do
+  (defs, sigs, n) <- State.get
+  let sigs' = map (\(id, info) -> (id, if id == id' then info' else info)) sigs
+  State.put (defs, sigs', n)