-getPortMapEntry ::
- SignalNameMap -- The port name to bind to
- -> SignalNameMap
- -- 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 (Single (portname, _)) (Single (signame, _)) =
- (Just portname) AST.:=>: (AST.ADName (AST.NSimple signame))
-expandExpr ::
- [(CoreBndr, SignalNameMap)]
- -- A list of bindings in effect
- -> CoreExpr -- The expression to expand
- -> VHDLState (
- [AST.SigDec], -- Needed signal declarations
- [AST.ConcSm], -- Needed component instantations and
- -- signal assignments.
- [SignalNameMap], -- The signal names corresponding to
- -- the expression's arguments
- SignalNameMap) -- The signal names corresponding to
- -- the expression's result.
-expandExpr binds lam@(Lam b expr) = do
- -- Generate a new signal to which we will expect this argument to be bound.
- signal_name <- uniqueName ("arg_" ++ getOccString b)
- -- Find the type of the binder
- let (arg_ty, _) = Type.splitFunTy (CoreUtils.exprType lam)
- -- Create signal names for the binder
- let arg_signal = getPortNameMapForTy ("xxx") arg_ty
- -- Create the corresponding signal declarations
- let signal_decls = mkSignalsFromMap arg_signal
- -- Add the binder to the list of binds
- let binds' = (b, arg_signal) : binds
- -- Expand the rest of the expression
- (signal_decls', statements', arg_signals', res_signal') <- expandExpr binds' expr
- -- Properly merge the results
- return (signal_decls ++ signal_decls',
- statements',
- arg_signal : arg_signals',
- res_signal')
-
-expandExpr binds (Var id) =
- return ([], [], [], Single (signal_id, ty))
- where
- -- Lookup the id in our binds map
- Single (signal_id, ty) = Maybe.fromMaybe
- (error $ "Argument " ++ getOccString id ++ "is unknown")
- (lookup id binds)
-
-expandExpr binds l@(Let (NonRec b bexpr) expr) = do
- (signal_decls, statements, arg_signals, res_signals) <- expandExpr binds bexpr
- let binds' = (b, res_signals) : binds
- (signal_decls', statements', arg_signals', res_signals') <- expandExpr binds' expr
- return (
- signal_decls ++ signal_decls',
- statements ++ statements',
- arg_signals',
- res_signals')
-
-expandExpr binds app@(App _ _) = do
- -- Is this a data constructor application?
- case CoreUtils.exprIsConApp_maybe app of
- -- Is this a tuple construction?
- Just (dc, args) -> if DataCon.isTupleCon dc
- then
- expandBuildTupleExpr binds (dataConAppArgs dc args)
- else
- error "Data constructors other than tuples not supported"
- otherise ->
- -- Normal function application, should map to a component instantiation
- let ((Var f), args) = collectArgs app in
- expandApplicationExpr binds (CoreUtils.exprType app) f args
-
-expandExpr binds expr@(Case (Var v) b _ alts) =
- case alts of
- [alt] -> expandSingleAltCaseExpr binds v b alt
- otherwise -> error $ "Multiple alternative case expression not supported: " ++ (showSDoc $ ppr expr)
-
-expandExpr binds expr@(Case _ b _ _) =
- error $ "Case expression with non-variable scrutinee not supported: " ++ (showSDoc $ ppr expr)
-
-expandExpr binds expr =
- error $ "Unsupported expression: " ++ (showSDoc $ ppr $ expr)
-
--- Expands the construction of a tuple into VHDL
-expandBuildTupleExpr ::
- [(CoreBndr, SignalNameMap)]
- -- A list of bindings in effect
- -> [CoreExpr] -- A list of expressions to put in the tuple
- -> VHDLState ( [AST.SigDec], [AST.ConcSm], [SignalNameMap], SignalNameMap)
- -- See expandExpr
-expandBuildTupleExpr binds args = do
- -- Split the tuple constructor arguments into types and actual values.
- -- Expand each of the values in the tuple
- (signals_declss, statementss, arg_signalss, res_signals) <-
- (Monad.liftM List.unzip4) $ mapM (expandExpr binds) args
- if any (not . null) arg_signalss
- then error "Putting high order functions in tuples not supported"
- else
- return (
- concat signals_declss,
- concat statementss,
- [],
- Tuple res_signals)
-
--- Expands the most simple case expression that scrutinizes a plain variable
--- and has a single alternative. This simple form currently allows only for
--- unpacking tuple variables.
-expandSingleAltCaseExpr ::
- [(CoreBndr, SignalNameMap)]
- -- A list of bindings in effect
- -> Var.Var -- The scrutinee
- -> CoreBndr -- The binder to bind the scrutinee to
- -> CoreAlt -- The single alternative
- -> VHDLState ( [AST.SigDec], [AST.ConcSm], [SignalNameMap], SignalNameMap)
- -- See expandExpr
-
-expandSingleAltCaseExpr binds v b alt@(DataAlt datacon, bind_vars, expr) =
- if not (DataCon.isTupleCon datacon)
- then
- error $ "Dataconstructors other than tuple constructors not supported in case pattern of alternative: " ++ (showSDoc $ ppr alt)
- else
- 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)
- -- TODO include b in the binds list
- -- Merge our existing binds with the new binds.
- binds' = (zip bind_vars tuple_ports) ++ binds
- in
- -- Expand the expression with the new binds list
- expandExpr binds' expr
-
-expandSingleAltCaseExpr _ _ _ alt =
- error $ "Case patterns other than data constructors not supported in case alternative: " ++ (showSDoc $ ppr alt)
-
-
--- Expands the application of argument to a function into VHDL
-expandApplicationExpr ::
- [(CoreBndr, SignalNameMap)]
- -- A list of bindings in effect
- -> Type -- The result type of the function call
- -> Var.Var -- The function to call
- -> [CoreExpr] -- A list of argumetns to apply to the function
- -> VHDLState ( [AST.SigDec], [AST.ConcSm], [SignalNameMap], SignalNameMap)
- -- See expandExpr
-expandApplicationExpr binds ty f args = do
- let name = getOccString f
- -- Generate a unique name for the application
- appname <- uniqueName ("app_" ++ name)
- -- Lookup the hwfunction to instantiate
- HWFunction vhdl_id inports outport <- getHWFunc (appToHsFunction f args ty)
- -- Expand each of the args, so each of them is reduced to output signals
- (arg_signal_decls, arg_statements, arg_res_signals) <- expandArgs binds args
- -- Bind each of the input ports to the expanded arguments
- let inmaps = concat $ zipWith createAssocElems inports arg_res_signals
- -- Create signal names for our result
- let res_signal = getPortNameMapForTy (appname ++ "_out") ty
- -- Create the corresponding signal declarations
- let signal_decls = mkSignalsFromMap res_signal
- -- Bind each of the output ports to our output signals
- let outmaps = mapOutputPorts outport res_signal
- -- Instantiate the component
- let component = AST.CSISm $ AST.CompInsSm
- (AST.unsafeVHDLBasicId appname)
- (AST.IUEntity (AST.NSimple vhdl_id))
- (AST.PMapAspect (inmaps ++ outmaps))
- -- Merge the generated declarations
- return (
- signal_decls ++ arg_signal_decls,
- component : arg_statements,
- [], -- We don't take any extra arguments; we don't support higher order functions yet
- res_signal)
-
--- Creates a list of AssocElems (port map lines) that maps the given signals
--- to the given ports.
-createAssocElems ::
- SignalNameMap -- The port names to bind to
- -> SignalNameMap -- The signals to bind to it
- -> [AST.AssocElem] -- The resulting port map lines
-
-createAssocElems (Single (port_id, _)) (Single (signal_id, _)) =
- [(Just port_id) AST.:=>: (AST.ADName (AST.NSimple signal_id))]
-
-createAssocElems (Tuple ports) (Tuple signals) =
- concat $ zipWith createAssocElems ports signals
-
--- Generate a signal declaration for a signal with the given name and the
--- given type and no value. Also returns the id of the signal.
-mkSignal :: String -> AST.TypeMark -> (AST.VHDLId, AST.SigDec)
-mkSignal name ty =
- (id, mkSignalFromId id ty)
- where
- id = AST.unsafeVHDLBasicId name
-
-mkSignalFromId :: AST.VHDLId -> AST.TypeMark -> AST.SigDec
-mkSignalFromId id ty =
- AST.SigDec id ty Nothing
-
--- Generates signal declarations for all the signals in the given map
-mkSignalsFromMap ::
- SignalNameMap
- -> [AST.SigDec]
-
-mkSignalsFromMap (Single (id, ty)) =
- [mkSignalFromId id ty]
-
-mkSignalsFromMap (Tuple signals) =
- concat $ map mkSignalsFromMap signals
-
-expandArgs ::
- [(CoreBndr, SignalNameMap)] -- A list of bindings in effect
- -> [CoreExpr] -- The arguments to expand
- -> VHDLState ([AST.SigDec], [AST.ConcSm], [SignalNameMap])
- -- 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
- (signal_decls, statements, arg_signals, res_signal) <- expandExpr binds e
- if not (null arg_signals)
- then error $ "Passing functions as arguments not supported: " ++ (showSDoc $ ppr e)
- else do
- (signal_decls', statements', res_signals') <- expandArgs binds exprs
- return (
- signal_decls ++ signal_decls',
- statements ++ statements',
- res_signal : res_signals')
-
-expandArgs _ [] = return ([], [], [])
-
--- Extract the arguments from a data constructor application (that is, the
--- normal args, leaving out the type args).
-dataConAppArgs :: DataCon -> [CoreExpr] -> [CoreExpr]
-dataConAppArgs dc args =
- drop tycount args
- where
- tycount = length $ DataCon.dataConAllTyVars dc
-
-mapOutputPorts ::
- SignalNameMap -- The output portnames of the component
- -> SignalNameMap -- The output portnames and/or signals to map these to
- -> [AST.AssocElem] -- The resulting output ports