diff --git a/include/llvm/Support/SourceMgr.h b/include/llvm/Support/SourceMgr.h
index 25775cb7441..4170c8d6dc6 100644
--- a/include/llvm/Support/SourceMgr.h
+++ b/include/llvm/Support/SourceMgr.h
@@ -30,6 +30,8 @@ public:
   SMLoc() : Ptr(0) {}
   SMLoc(const SMLoc &RHS) : Ptr(RHS.Ptr) {}
   
+  bool isValid() const { return Ptr != 0; }
+
   bool operator==(const SMLoc &RHS) const { return RHS.Ptr == Ptr; }
   bool operator!=(const SMLoc &RHS) const { return RHS.Ptr != Ptr; }