Add is_let predicate.

[matthijs/master-project/cλash.git] / cλash / CLasH / Utils / Core / CoreTools.hs

diff --git a/cλash/CLasH/Utils/Core/CoreTools.hs b/cλash/CLasH/Utils/Core/CoreTools.hs
index cd85b4d0102e257d8f650782e9fdac516fbe6c2f..a4ea1eca740bbd7f6222781b30259a90a31e7e8c 100644 (file)
--- a/cλash/CLasH/Utils/Core/CoreTools.hs
+++ b/cλash/CLasH/Utils/Core/CoreTools.hs
@@ -7,7 +7,7 @@ module CLasH.Utils.Core.CoreTools where
 
 --Standard modules
 import qualified Maybe
-import System.IO.Unsafe
+import qualified System.IO.Unsafe
 
 -- GHC API
 import qualified GHC
@@ -15,24 +15,18 @@ import qualified Type
 import qualified TcType
 import qualified HsExpr
 import qualified HsTypes
-import qualified HsBinds
 import qualified HscTypes
-import qualified RdrName
 import qualified Name
-import qualified OccName
-import qualified Type
 import qualified Id
 import qualified TyCon
 import qualified DataCon
 import qualified TysWiredIn
-import qualified Bag
 import qualified DynFlags
 import qualified SrcLoc
 import qualified CoreSyn
 import qualified Var
 import qualified IdInfo
 import qualified VarSet
-import qualified Unique
 import qualified CoreUtils
 import qualified CoreFVs
 import qualified Literal
@@ -73,9 +67,8 @@ eval_tfp_int env ty =
 
 normalise_tfp_int :: HscTypes.HscEnv -> Type.Type -> Type.Type
 normalise_tfp_int env ty =
-   unsafePerformIO $ do
-     nty <- normaliseType env ty
-     return nty
+   System.IO.Unsafe.unsafePerformIO $
+     normaliseType env ty
 
 -- | Get the width of a SizedWord type
 -- sized_word_len :: HscTypes.HscEnv -> Type.Type -> Int
@@ -155,6 +148,11 @@ is_lam :: CoreSyn.CoreExpr -> Bool
 is_lam (CoreSyn.Lam _ _) = True
 is_lam _ = False
 
+-- Is the given core expression a let expression?
+is_let :: CoreSyn.CoreExpr -> Bool
+is_let (CoreSyn.Let _ _) = True
+is_let _ = False
+
 -- Is the given core expression of a function type?
 is_fun :: CoreSyn.CoreExpr -> Bool
 -- Treat Type arguments differently, because exprType is not defined for them.
@@ -193,6 +191,10 @@ is_simple _ = False
 has_free_tyvars :: CoreSyn.CoreExpr -> Bool
 has_free_tyvars = not . VarSet.isEmptyVarSet . (CoreFVs.exprSomeFreeVars Var.isTyVar)
 
+-- Does the given type have any free type vars?
+ty_has_free_tyvars :: Type.Type -> Bool
+ty_has_free_tyvars = not . VarSet.isEmptyVarSet . Type.tyVarsOfType
+
 -- Does the given CoreExpr have any free local vars?
 has_free_vars :: CoreSyn.CoreExpr -> Bool
 has_free_vars = not . VarSet.isEmptyVarSet . CoreFVs.exprFreeVars
@@ -224,13 +226,21 @@ get_val_args ty args = drop n args
     -- arguments, to get at the value arguments.
     n = length tyvars + length predtypes
 
-getLiterals :: CoreSyn.CoreExpr -> [CoreSyn.CoreExpr]
-getLiterals app@(CoreSyn.App _ _) = literals
+getLiterals :: HscTypes.HscEnv -> CoreSyn.CoreExpr -> [CoreSyn.CoreExpr]
+getLiterals _ app@(CoreSyn.App _ _) = literals
   where
     (CoreSyn.Var f, args) = CoreSyn.collectArgs app
     literals = filter (is_lit) args
 
-getLiterals lit@(CoreSyn.Lit _) = [lit]
+getLiterals _ lit@(CoreSyn.Lit _) = [lit]
+
+getLiterals hscenv letrec@(CoreSyn.Let (CoreSyn.NonRec letBind (letExpr)) letRes) = [lit]
+  where
+    ty     = Var.varType letBind
+    litInt = eval_tfp_int hscenv ty
+    lit    = CoreSyn.Lit (Literal.mkMachInt (toInteger litInt))
+
+getLiterals _ expr = error $ "\nCoreTools.getLiterals: Not a known Lit: " ++ pprString expr
 
 reduceCoreListToHsList :: 
   [HscTypes.CoreModule] -- ^ The modules where parts of the list are hidden
@@ -265,7 +275,7 @@ reduceCoreListToHsList _ _ = return []
 
 -- Is the given var the State data constructor?
 isStateCon :: Var.Var -> Bool
-isStateCon var = do
+isStateCon var =
   -- See if it is a DataConWrapId (not DataConWorkId, since State is a
   -- newtype).
   case Id.idDetails var of
@@ -361,8 +371,8 @@ genUniques' subst (CoreSyn.App f arg) = do
   f' <- genUniques' subst f
   arg' <- genUniques' subst arg
   return (CoreSyn.App f' arg')
-genUniques' subst (CoreSyn.Lam bndr res) | CoreSyn.isTyVar bndr =
-  error $ "Cloning type variables not supported!"
+-- Don't change type abstractions
+genUniques' subst expr@(CoreSyn.Lam bndr res) | CoreSyn.isTyVar bndr = return expr
 genUniques' subst (CoreSyn.Lam bndr res) = do
   -- Generate a new unique for the bound variable
   (subst', bndr') <- genUnique subst bndr
@@ -377,7 +387,7 @@ genUniques' subst (CoreSyn.Let (CoreSyn.NonRec bndr bound) res) = do
 genUniques' subst (CoreSyn.Let (CoreSyn.Rec binds) res) = do
   -- Make each of the binders unique
   (subst', bndrs') <- mapAccumLM genUnique subst (map fst binds)
-  bounds' <- mapM (genUniques' subst') (map snd binds)
+  bounds' <- mapM (genUniques' subst' . snd) binds
   res' <- genUniques' subst' res
   let binds' = zip bndrs' bounds'
   return $ CoreSyn.Let (CoreSyn.Rec binds') res'