1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Lex/PPLexerChange.cpp b/lib/Lex/PPLexerChange.cpp
index 5a589d6a17b36..1c0cd5636835e 100644
--- a/lib/Lex/PPLexerChange.cpp
+++ b/lib/Lex/PPLexerChange.cpp
@@ -46,6 +46,12 @@ bool Preprocessor::isInPrimaryFile() const {
   });
 }
 
+bool Preprocessor::isInMainFile() const {
+  if (IsFileLexer())
+    return IncludeMacroStack.size() == 0;
+  return true;
+}
+
 /// getCurrentLexer - Return the current file lexer being lexed from.  Note
 /// that this ignores any potentially active macro expansions and _Pragma
 /// expansions going on at the time.