Create empty StringRef is incoming cstring is NULL.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83082 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/ADT/StringRef.h b/include/llvm/ADT/StringRef.h
index e4fd258cb87182ef27a6c01e0ec5554f2eb4ff41..30379a38f46fdb9d31d7d43130380d1aa7cd8e5a 100644 (file)
--- a/include/llvm/ADT/StringRef.h
+++ b/include/llvm/ADT/StringRef.h
@@ -46,7 +46,7 @@ namespace llvm {
 
     /// Construct a string ref from a cstring.
     /*implicit*/ StringRef(const char *Str) 
-      : Data(Str), Length(::strlen(Str)) {}
+      : Data(Str) { if (Str) Length = ::strlen(Str); else Length = 0; }
  
     /// Construct a string ref from a pointer and length.
     /*implicit*/ StringRef(const char *_Data, unsigned _Length)