-- This module provides functions for program transformations.
--
module CLasH.Normalize.NormalizeTools where
+
-- Standard modules
import Debug.Trace
import qualified List
-- GHC API
import CoreSyn
-import qualified UniqSupply
-import qualified Unique
-import qualified OccName
-import qualified Name
-import qualified Var
-import qualified SrcLoc
-import qualified Type
-import qualified IdInfo
-import qualified CoreUtils
import qualified CoreSubst
-import qualified VarSet
-import qualified HscTypes
+import qualified CoreUtils
import Outputable ( showSDoc, ppr, nest )
-- Local imports
import CLasH.Normalize.NormalizeTypes
+import CLasH.Translator.TranslatorTypes
import CLasH.Utils.Pretty
import CLasH.VHDL.VHDLTypes
import qualified CLasH.VHDL.VHDLTools as VHDLTools
--- Create a new internal var with the given name and type. A Unique is
--- appended to the given name, to ensure uniqueness (not strictly neccesary,
--- since the Unique is also stored in the name, but this ensures variable
--- names are unique in the output).
-mkInternalVar :: String -> Type.Type -> TransformMonad Var.Var
-mkInternalVar str ty = do
- uniq <- mkUnique
- let occname = OccName.mkVarOcc (str ++ show uniq)
- let name = Name.mkInternalName uniq occname SrcLoc.noSrcSpan
- return $ Var.mkLocalVar IdInfo.VanillaId name ty IdInfo.vanillaIdInfo
-
--- Create a new type variable with the given name and kind. A Unique is
--- appended to the given name, to ensure uniqueness (not strictly neccesary,
--- since the Unique is also stored in the name, but this ensures variable
--- names are unique in the output).
-mkTypeVar :: String -> Type.Kind -> TransformMonad Var.Var
-mkTypeVar str kind = do
- uniq <- mkUnique
- let occname = OccName.mkVarOcc (str ++ show uniq)
- let name = Name.mkInternalName uniq occname SrcLoc.noSrcSpan
- return $ Var.mkTyVar name kind
-
--- Creates a binder for the given expression with the given name. This
--- works for both value and type level expressions, so it can return a Var or
--- TyVar (which is just an alias for Var).
-mkBinderFor :: CoreExpr -> String -> TransformMonad Var.Var
-mkBinderFor (Type ty) string = mkTypeVar string (Type.typeKind ty)
-mkBinderFor expr string = mkInternalVar string (CoreUtils.exprType expr)
-
--- Creates a reference to the given variable. This works for both a normal
--- variable as well as a type variable
-mkReferenceTo :: Var.Var -> CoreExpr
-mkReferenceTo var | Var.isTyVar var = (Type $ Type.mkTyVarTy var)
- | otherwise = (Var var)
-
-cloneVar :: Var.Var -> TransformMonad Var.Var
-cloneVar v = do
- uniq <- mkUnique
- -- Swap out the unique, and reset the IdInfo (I'm not 100% sure what it
- -- contains, but vannillaIdInfo is always correct, since it means "no info").
- return $ Var.lazySetIdInfo (Var.setVarUnique v uniq) IdInfo.vanillaIdInfo
-
--- Creates a new function with the same name as the given binder (but with a
--- new unique) and with the given function body. Returns the new binder for
--- this function.
-mkFunction :: CoreBndr -> CoreExpr -> TransformMonad CoreBndr
-mkFunction bndr body = do
- let ty = CoreUtils.exprType body
- id <- cloneVar bndr
- let newid = Var.setVarType id ty
- Trans.lift $ addGlobalBind newid body
- return newid
-
-- Apply the given transformation to all expressions in the given expression,
-- including the expression itself.
everywhere :: (String, Transform) -> Transform
subnotappargs trans expr = subeverywhere (notappargs trans) expr
-- Runs each of the transforms repeatedly inside the State monad.
-dotransforms :: [Transform] -> CoreExpr -> TransformSession CoreExpr
+dotransforms :: [Transform] -> CoreExpr -> TranslatorSession CoreExpr
dotransforms transs expr = do
(expr', changed) <- Writer.runWriterT $ Monad.foldM (flip ($)) expr transs
if Monoid.getAny changed then dotransforms transs expr' else return expr'
-- Inline all let bindings that satisfy the given condition
inlinebind :: ((CoreBndr, CoreExpr) -> TransformMonad Bool) -> Transform
-inlinebind condition expr@(Let (Rec binds) res) = do
- -- Find all bindings that adhere to the condition
- res_eithers <- mapM docond binds
- case Either.partitionEithers res_eithers of
- -- No replaces? No change
- ([], _) -> return expr
- (replace, others) -> do
- -- Substitute the to be replaced binders with their expression
- let newexpr = substitute replace (Let (Rec others) res)
- change newexpr
- where
- docond :: (CoreBndr, CoreExpr) -> TransformMonad (Either (CoreBndr, CoreExpr) (CoreBndr, CoreExpr))
- docond b = do
- res <- condition b
- return $ case res of True -> Left b; False -> Right b
-
+inlinebind condition expr@(Let (NonRec bndr expr') res) = do
+ applies <- condition (bndr, expr')
+ if applies
+ then
+ -- Substitute the binding in res and return that
+ change $ substitute [(bndr, expr')] res
+ else
+ -- Don't change this let
+ return expr
-- Leave all other expressions unchanged
inlinebind _ expr = return expr
setChanged
return val
--- Create a new Unique
-mkUnique :: TransformMonad Unique.Unique
-mkUnique = Trans.lift $ do
- us <- getA tsUniqSupply
- let (us', us'') = UniqSupply.splitUniqSupply us
- putA tsUniqSupply us'
- return $ UniqSupply.uniqFromSupply us''
+-- Returns the given value and sets the changed flag if the bool given is
+-- True. Note that this will not unset the changed flag if the bool is False.
+changeif :: Bool -> a -> TransformMonad a
+changeif True val = change val
+changeif False val = return val
-- Replace each of the binders given with the coresponding expressions in the
-- given expression.
-- substitutions
subss' = map (Arrow.second (CoreSubst.substExpr subs)) subss
--- Run a given TransformSession. Used mostly to setup the right calls and
--- an initial state.
-runTransformSession :: HscTypes.HscEnv -> UniqSupply.UniqSupply -> TransformSession a -> a
-runTransformSession env uniqSupply session = State.evalState session emptyTransformState
- where
- emptyTypeState = TypeState Map.empty [] Map.empty Map.empty env
- emptyTransformState = TransformState uniqSupply Map.empty VarSet.emptyVarSet emptyTypeState
-
-- Is the given expression representable at runtime, based on the type?
isRepr :: CoreSyn.CoreExpr -> TransformMonad Bool
isRepr (Type ty) = return False
isRepr expr = Trans.lift $ MonadState.lift tsType $ VHDLTools.isReprType (CoreUtils.exprType expr)
-is_local_var :: CoreSyn.CoreExpr -> TransformSession Bool
+is_local_var :: CoreSyn.CoreExpr -> TranslatorSession Bool
is_local_var (CoreSyn.Var v) = do
bndrs <- getGlobalBinders
return $ not $ v `elem` bndrs
projects / matthijs / master-project / cλash.git / blobdiff