Merge git://github.com/darchon/clash into cλash

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

diff --git a/CoreTools.hs b/CoreTools.hs
index ed0c52d88a7e81ee6428debe2a48fc5c81a48388..0297f90435c02000cb7b75d0ae0b4ff9833a7484 100644 (file)
--- a/CoreTools.hs
+++ b/CoreTools.hs
@@ -10,6 +10,7 @@ import qualified Maybe
 -- GHC API
 import qualified GHC
 import qualified Type
+import qualified TcType
 import qualified HsExpr
 import qualified HsTypes
 import qualified HsBinds
@@ -97,7 +98,7 @@ tfvec_len ty =
   where  
     args = case Type.splitTyConApp_maybe ty of
       Just (tycon, args) -> args
-      Nothing -> error $ "CoreTools.tfvec_len Not a vector type: " ++ (pprString ty)
+      Nothing -> error $ "\nCoreTools.tfvec_len: Not a vector type: " ++ (pprString ty)
     [len, el_ty] = args
     
 -- | Get the element type of a TFVec type
@@ -106,7 +107,7 @@ tfvec_elem ty = el_ty
   where
     args = case Type.splitTyConApp_maybe ty of
       Just (tycon, args) -> args
-      Nothing -> error $ "CoreTools.tfvec_len Not a vector type: " ++ (pprString ty)
+      Nothing -> error $ "\nCoreTools.tfvec_len: Not a vector type: " ++ (pprString ty)
     [len, el_ty] = args
 
 -- Is this a wild binder?
@@ -164,3 +165,16 @@ has_free_vars = not . VarSet.isEmptyVarSet . CoreFVs.exprFreeVars
 -- simple Var CoreExprs, not complexer ones.
 exprToVar :: CoreSyn.CoreExpr -> Var.Id
 exprToVar (CoreSyn.Var id) = id
+exprToVar expr = error $ "\nCoreTools.exprToVar: Not a var: " ++ show expr
+
+-- Removes all the type and dictionary arguments from the given argument list,
+-- leaving only the normal value arguments. The type given is the type of the
+-- expression applied to this argument list.
+get_val_args :: Type.Type -> [CoreSyn.CoreExpr] -> [CoreSyn.CoreExpr]
+get_val_args ty args = drop n args
+  where
+    (tyvars, predtypes, _) = TcType.tcSplitSigmaTy ty
+    -- The first (length tyvars) arguments should be types, the next 
+    -- (length predtypes) arguments should be dictionaries. We drop this many
+    -- arguments, to get at the value arguments.
+    n = length tyvars + length predtypes