Add SMLoc::isValid method.

 - To support using SMLoc as a sentinel.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74474 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Support/SourceMgr.h b/include/llvm/Support/SourceMgr.h
index 25775cb74419d514201fa16d43071a11e83e747e..4170c8d6dc6495fdceea342055996d602e58f308 100644 (file)
--- 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; }