X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FSupport%2FSMLoc.h;h=d5b4c57a8fd6e8d547a3ab536d28dba6b82fc5f1;hb=00552e3875ee5f382db6c98286a241a7d0efe1b8;hp=fb86ee79b2e09b04896d66cae527306e312f288b;hpb=1ae486a4a06a5132c094b9ce66836ff081fea3a6;p=oota-llvm.git

diff --git a/include/llvm/Support/SMLoc.h b/include/llvm/Support/SMLoc.h
index fb86ee79b2e..d5b4c57a8fd 100644
--- a/include/llvm/Support/SMLoc.h
+++ b/include/llvm/Support/SMLoc.h
@@ -1,4 +1,4 @@
-//===- SMLoc.h - Manager for Source Buffers & Diagnostics -------*- C++ -*-===//
+//===- SMLoc.h - Source location for use with diagnostics -------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -12,25 +12,26 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef SUPPORT_SMLOC_H
-#define SUPPORT_SMLOC_H
+#ifndef LLVM_SUPPORT_SMLOC_H
+#define LLVM_SUPPORT_SMLOC_H
+
+#include <cassert>
 
 namespace llvm {
 
-// SMLoc - Represents a location in source code.
-class SMLoc {    
+/// Represents a location in source code.
+class SMLoc {
   const char *Ptr;
 public:
-  SMLoc() : Ptr(0) {}
-  SMLoc(const SMLoc &RHS) : Ptr(RHS.Ptr) {}
-    
-  bool isValid() const { return Ptr != 0; }
-    
+  SMLoc() : Ptr(nullptr) {}
+
+  bool isValid() const { return Ptr != nullptr; }
+
   bool operator==(const SMLoc &RHS) const { return RHS.Ptr == Ptr; }
   bool operator!=(const SMLoc &RHS) const { return RHS.Ptr != Ptr; }
-    
+
   const char *getPointer() const { return Ptr; }
-    
+
   static SMLoc getFromPointer(const char *Ptr) {
     SMLoc L;
     L.Ptr = Ptr;
@@ -38,6 +39,25 @@ public:
   }
 };
 
-}
+/// Represents a range in source code.
+///
+/// SMRange is implemented using a half-open range, as is the convention in C++.
+/// In the string "abc", the range (1,3] represents the substring "bc", and the
+/// range (2,2] represents an empty range between the characters "b" and "c".
+class SMRange {
+public:
+  SMLoc Start, End;
+
+  SMRange() {}
+  SMRange(SMLoc St, SMLoc En) : Start(St), End(En) {
+    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
 
-#endif
\ No newline at end of file