X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2FbasicTypes%2FVarEnv.lhs;h=f275714e5c478d6bc70f3b811ea72db3cb35c2a8;hb=aae915d6743e4c0986625f142df1fbc1384ff8df;hp=5a087079a3b24f7074e15e7ed91a2e4bc30d8d4e;hpb=afd6da0d938747f45b16c8d6eb5d786e59a21218;p=ghc-hetmet.git

diff --git a/compiler/basicTypes/VarEnv.lhs b/compiler/basicTypes/VarEnv.lhs
index 5a08707..f275714 100644
--- a/compiler/basicTypes/VarEnv.lhs
+++ b/compiler/basicTypes/VarEnv.lhs
@@ -14,6 +14,7 @@ module VarEnv (
 	extendVarEnv, extendVarEnv_C, extendVarEnv_Acc, extendVarEnvList,
 	plusVarEnv, plusVarEnv_C,
 	delVarEnvList, delVarEnv,
+        minusVarEnv, intersectsVarEnv,
 	lookupVarEnv, lookupVarEnv_NF, lookupWithDefaultVarEnv,
 	mapVarEnv, zipVarEnv,
 	modifyVarEnv, modifyVarEnv_Directly,
@@ -28,14 +29,15 @@ module VarEnv (
 	emptyInScopeSet, mkInScopeSet, delInScopeSet,
 	extendInScopeSet, extendInScopeSetList, extendInScopeSetSet, 
 	getInScopeVars, lookupInScope, lookupInScope_Directly, 
-        elemInScopeSet, uniqAway, 
+        unionInScope, elemInScopeSet, uniqAway, 
 
 	-- * The RnEnv2 type
 	RnEnv2, 
 	
 	-- ** Operations on RnEnv2s
 	mkRnEnv2, rnBndr2, rnBndrs2, rnOccL, rnOccR, inRnEnvL, inRnEnvR,
-	rnBndrL, rnBndrR, nukeRnEnvL, nukeRnEnvR, extendRnInScopeList,
+        rnBndrL, rnBndrR, nukeRnEnvL, nukeRnEnvR,
+        addRnInScopeSet,
         rnEtaL, rnEtaR,
 	rnInScope, rnInScopeSet, lookupRnInScope,
 
@@ -120,6 +122,10 @@ lookupInScope (InScope in_scope _) v  = lookupVarEnv in_scope v
 lookupInScope_Directly :: InScopeSet -> Unique -> Maybe Var
 lookupInScope_Directly (InScope in_scope _) uniq
   = lookupVarEnv_Directly in_scope uniq
+
+unionInScope :: InScopeSet -> InScopeSet -> InScopeSet
+unionInScope (InScope s1 _) (InScope s2 n2)
+  = InScope (s1 `plusVarEnv` s2) n2
 \end{code}
 
 \begin{code}
@@ -199,9 +205,10 @@ mkRnEnv2 vars = RV2	{ envL 	   = emptyVarEnv
 			, envR 	   = emptyVarEnv
 			, in_scope = vars }
 
-extendRnInScopeList :: RnEnv2 -> [Var] -> RnEnv2
-extendRnInScopeList env vs
-  = env { in_scope = extendInScopeSetList (in_scope env) vs }
+addRnInScopeSet :: RnEnv2 -> VarEnv Var -> RnEnv2
+addRnInScopeSet env vs
+  | isEmptyVarEnv vs = env
+  | otherwise        = env { in_scope = extendInScopeSetSet (in_scope env) vs }
 
 rnInScope :: Var -> RnEnv2 -> Bool
 rnInScope x env = x `elemInScopeSet` in_scope env
@@ -352,6 +359,8 @@ filterVarEnv_Directly :: (Unique -> a -> Bool) -> VarEnv a -> VarEnv a
 restrictVarEnv    :: VarEnv a -> VarSet -> VarEnv a
 delVarEnvList     :: VarEnv a -> [Var] -> VarEnv a
 delVarEnv	  :: VarEnv a -> Var -> VarEnv a
+minusVarEnv       :: VarEnv a -> VarEnv a -> VarEnv a
+intersectsVarEnv  :: VarEnv a -> VarEnv a -> Bool
 plusVarEnv_C	  :: (a -> a -> a) -> VarEnv a -> VarEnv a -> VarEnv a
 mapVarEnv	  :: (a -> b) -> VarEnv a -> VarEnv b
 modifyVarEnv	  :: (a -> a) -> VarEnv a -> Var -> VarEnv a
@@ -377,6 +386,8 @@ extendVarEnvList = addListToUFM
 plusVarEnv_C	 = plusUFM_C
 delVarEnvList	 = delListFromUFM
 delVarEnv	 = delFromUFM
+minusVarEnv      = minusUFM
+intersectsVarEnv e1 e2 = not (isEmptyVarEnv (e1 `intersectUFM` e2))
 plusVarEnv	 = plusUFM
 lookupVarEnv	 = lookupUFM
 lookupWithDefaultVarEnv = lookupWithDefaultUFM