X-Git-Url: https://git.stderr.nl/gitweb?a=blobdiff_plain;f=CoreTools.hs;h=3c26793c8c804ce7f9dd7262851565398638195d;hb=c38002cdfd1ec55ffcd6661d7ac2d6c44d220d87;hp=0dee4715f7ed55e5f58ba7ae3527799f60166feb;hpb=c5cde0d59dbe9dccb7a7d1752f2d2e6c7001e8bb;p=matthijs%2Fmaster-project%2Fc%CE%BBash.git

diff --git a/CoreTools.hs b/CoreTools.hs
index 0dee471..3c26793 100644
--- 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
@@ -90,6 +95,13 @@ tfvec_len ty =
   where 
     (tycon, args) = Type.splitTyConApp ty
     [len, el_ty] = args
+    
+-- | Get the element type of a TFVec type
+tfvec_elem :: Type.Type -> Type.Type
+tfvec_elem ty = el_ty
+  where
+    (tycon, args) = Type.splitTyConApp ty
+    [len, el_ty] = args
 
 -- Is this a wild binder?
 is_wild :: CoreSyn.CoreBndr -> Bool
@@ -106,4 +118,27 @@ 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
+
+-- Can the given core expression be applied to something? This is true for
+-- applying to a value as well as a type.
+is_applicable :: CoreSyn.CoreExpr -> Bool
+is_applicable expr = is_fun expr || is_poly expr
+
+-- 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)