- Allow to pre-filter before calling the FindObjectVisitor.

runtime/vm/visitor.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_VISITOR_H_
 #define VM_VISITOR_H_
 
 #include "vm/globals.h"
 #include "vm/growable_array.h"
 
@@ skipping 51 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(ObjectVisitor);
 };
 
 
 // An object finder visitor interface.
 class FindObjectVisitor {
  public:
   explicit FindObjectVisitor(Isolate* isolate) : isolate_(isolate) {}
   virtual ~FindObjectVisitor() {}
 
+  // Allow to specify a address filter.
+  virtual uword filter_addr() { return 0; }
+
   // Check if object matches find condition.
   virtual bool FindObject(RawObject* obj) = 0;
 
  private:
   Isolate* isolate_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(FindObjectVisitor);
 };
 
 }  // namespace dart
 
 #endif  // VM_VISITOR_H_