Rename cλash dir to clash so it behaves well within the ghc build tree

[matthijs/master-project/cλash.git] / clash / CLasH / Normalize / NormalizeTypes.hs

diff --git a/clash/CLasH/Normalize/NormalizeTypes.hs b/clash/CLasH/Normalize/NormalizeTypes.hs
new file mode 100644 (file)
index 0000000..4e98709
--- /dev/null
+++ b/clash/CLasH/Normalize/NormalizeTypes.hs
@@ -0,0 +1,34 @@
+module CLasH.Normalize.NormalizeTypes where
+
+-- Standard modules
+import qualified Control.Monad.Trans.Writer as Writer
+import qualified Data.Monoid as Monoid
+
+-- GHC API
+import qualified CoreSyn
+
+-- Local imports
+import CLasH.Translator.TranslatorTypes
+
+-- Wrap a writer around a TranslatorSession, to run a single transformation
+-- over a single expression and track if the expression was changed.
+type TransformMonad = Writer.WriterT Monoid.Any TranslatorSession
+
+-- | In what context does a core expression occur?
+data CoreContext = AppFirst        -- ^ The expression is the first
+                                   -- argument of an application (i.e.,
+                                   -- it is applied)
+                 | AppSecond       -- ^ The expression is the second
+                                   --   argument of an application
+                                   --   (i.e., something is applied to it)
+                 | LetBinding      -- ^ The expression is bound in a
+                                   --   (recursive or non-recursive) let
+                                   --   expression.
+                 | LetBody         -- ^ The expression is the body of a
+                                   --   let expression
+                 | LambdaBody      -- ^ The expression is the body of a
+                                   --   lambda abstraction
+                 | Other           -- ^ Another context
+  deriving (Eq, Show)
+-- | Transforms a CoreExpr and keeps track if it has changed.
+type Transform = [CoreContext] -> CoreSyn.CoreExpr -> TransformMonad CoreSyn.CoreExpr