1 files changed, 10 insertions, 0 deletions
diff --git a/clang/lib/Lex/MacroArgs.cpp b/clang/lib/Lex/MacroArgs.cpp
index d2525c0cd6c..5c0f0623c3e 100644
--- a/clang/lib/Lex/MacroArgs.cpp
+++ b/clang/lib/Lex/MacroArgs.cpp
@@ -135,6 +135,16 @@ const Token *MacroArgs::getUnexpArgument(unsigned Arg) const {
   return Result;
 }
 
+// This function assumes that the variadic arguments are the tokens
+// corresponding to the last parameter (ellipsis) - and since tokens are
+// separated by the 'eof' token, if that is the only token corresponding to that
+// last parameter, we know no variadic arguments were supplied.
+bool MacroArgs::invokedWithVariadicArgument(const MacroInfo *const MI) const {
+  if (!MI->isVariadic())
+    return false;
+  const int VariadicArgIndex = getNumMacroArguments() - 1;
+  return getUnexpArgument(VariadicArgIndex)->isNot(tok::eof);
+}
 
 /// ArgNeedsPreexpansion - If we can prove that the argument won't be affected
 /// by pre-expansion, return false.  Otherwise, conservatively return true.