1 files changed, 22 insertions, 0 deletions
diff --git a/libcpp/lex.c b/libcpp/lex.c
index 37df6efc0b7..7eafb13d3b4 100644
--- a/libcpp/lex.c
+++ b/libcpp/lex.c
@@ -1556,3 +1556,25 @@ _cpp_aligned_alloc (cpp_reader *pfile, size_t len)
   buff->cur = result + len;
   return result;
 }
+
+/* Say which field of TOK is in use.  */
+
+enum cpp_token_fld_kind
+cpp_token_val_index (cpp_token *tok)
+{
+  switch (TOKEN_SPELL (tok))
+    {
+    case SPELL_IDENT:
+      return CPP_TOKEN_FLD_NODE;
+    case SPELL_LITERAL:
+      return CPP_TOKEN_FLD_STR;
+    case SPELL_NONE:
+      if (tok->type == CPP_MACRO_ARG)
+	return CPP_TOKEN_FLD_ARG_NO;
+      else if (tok->type == CPP_PADDING)
+	return CPP_TOKEN_FLD_SOURCE;
+      /* else fall through */
+    default:
+      return CPP_TOKEN_FLD_NONE;
+    }
+}