diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -567,6 +567,14 @@
     def close(self):
         self._writecaches()
 
+    def addvisibilityexceptions(self, exceptions):
+        # should be called on a filtered repository
+        pass
+
+    def getvisibilityexceptions(self):
+        # should be called on a filtered repository
+        return set()
+
     def _loadextensions(self):
         extensions.loadall(self.ui)
 
diff --git a/mercurial/repoview.py b/mercurial/repoview.py
--- a/mercurial/repoview.py
+++ b/mercurial/repoview.py
@@ -190,6 +190,8 @@
         object.__setattr__(self, r'filtername', filtername)
         object.__setattr__(self, r'_clcachekey', None)
         object.__setattr__(self, r'_clcache', None)
+        # hidden hashes which should be visible
+        self._visibilityexceptions = set()
 
     # not a propertycache on purpose we shall implement a proper cache later
     @property
@@ -231,6 +233,14 @@
             return self
         return self.unfiltered().filtered(name)
 
+    def addvisibilityexceptions(self, revs):
+        """adds hidden revs which should be visible to set of exceptions"""
+        self._visibilityexceptions.update(revs)
+
+    def getvisibilityexceptions(self):
+        """returns the set of hidden revs which should be visible"""
+        return self._visibilityexceptions
+
     # everything access are forwarded to the proxied repo
     def __getattr__(self, attr):
         return getattr(self._unfilteredrepo, attr)