Add has_free_tyvars predicate.

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

diff --git a/CoreTools.hs b/CoreTools.hs
index a8dce3fab43ac345762307704a27b6d1e31592b3..4cafec1b34f8225870b4cb6b32af8ee03505936a 100644 (file)
--- a/CoreTools.hs
+++ b/CoreTools.hs
@@ -3,7 +3,10 @@
 -- Core and Haskell (it uses HsTools for this), but only the functions that
 -- know about various libraries and know which functions to call.
 module CoreTools where
-  
+
+--Standard modules
+import qualified Maybe
+
 -- GHC API
 import qualified GHC
 import qualified Type
@@ -19,8 +22,10 @@ import qualified DynFlags
 import qualified SrcLoc
 import qualified CoreSyn
 import qualified Var
+import qualified VarSet
 import qualified Unique
 import qualified CoreUtils
+import qualified CoreFVs
 
 import GhcTools
 import HsTools
@@ -98,4 +103,22 @@ is_lam _ = False
 
 -- Is the given core expression of a function type?
 is_fun :: CoreSyn.CoreExpr -> Bool
-is_fun = Type.isFunTy . CoreUtils.exprType
+-- Treat Type arguments differently, because exprType is not defined for them.
+is_fun (CoreSyn.Type _) = False
+is_fun expr = (Type.isFunTy . CoreUtils.exprType) expr
+
+-- Is the given core expression polymorphic (i.e., does it accept type
+-- arguments?).
+is_poly :: CoreSyn.CoreExpr -> Bool
+-- Treat Type arguments differently, because exprType is not defined for them.
+is_poly (CoreSyn.Type _) = False
+is_poly expr = (Maybe.isJust . Type.splitForAllTy_maybe . CoreUtils.exprType) expr
+
+-- Is the given core expression a variable reference?
+is_var :: CoreSyn.CoreExpr -> Bool
+is_var (CoreSyn.Var _) = True
+is_var _ = False
+
+-- Does the given CoreExpr have any free type vars?
+has_free_tyvars :: CoreSyn.CoreExpr -> Bool
+has_free_tyvars = not . VarSet.isEmptyVarSet . (CoreFVs.exprSomeFreeVars Var.isTyVar)