1 files changed, 20 insertions, 2 deletions
diff --git a/include/llvm/Support/SMLoc.h b/include/llvm/Support/SMLoc.h
index 02db32794b..d48bfcc30c 100644
--- a/include/llvm/Support/SMLoc.h
+++ b/include/llvm/Support/SMLoc.h
@@ -15,9 +15,11 @@
 #ifndef SUPPORT_SMLOC_H
 #define SUPPORT_SMLOC_H
 
+#include <cassert>
+
 namespace llvm {
 
-// SMLoc - Represents a location in source code.
+/// SMLoc - Represents a location in source code.
 class SMLoc {
   const char *Ptr;
 public:
@@ -38,7 +40,23 @@ public:
   }
 };
 
-}
+/// SMRange - Represents a range in source code.  Note that unlike standard STL
+/// ranges, the locations specified are considered to be *inclusive*.  For
+/// example, [X,X] *does* include X, it isn't an empty range.
+class SMRange {
+public:
+  SMLoc Start, End;
+
+  SMRange() {}
+  SMRange(SMLoc Start, SMLoc End) : Start(Start), End(End) {
+    assert(Start.isValid() == End.isValid() &&
+           "Start and end should either both be valid or both be invalid!");
+  }
+  
+  bool isValid() const { return Start.isValid(); }
+};
+  
+} // end namespace llvm
 
 #endif