parse.y: freeze filename

* parse.y (ripper_initialize): filename can not be modified.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45397 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Mon Mar 24 22:19:56 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* parse.y (ripper_initialize): filename can not be modified.
+
 Mon Mar 24 15:19:47 2014  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* addr2line.c (rb_dump_backtrace_with_lines): fetch path of the

parse.y

@@ -11445,9 +11445,11 @@ ripper_initialize(int argc, VALUE *argv, VALUE self)
     parser->eofp = Qfalse;
     if (NIL_P(fname)) {
         fname = STR_NEW2("(ripper)");
+	OBJ_FREEZE(fname);
     }
     else {
         StringValue(fname);
+	fname = rb_str_new_frozen(fname);
     }
     parser_initialize(parser);
 

test/ripper/test_ripper.rb

@@ -26,6 +26,10 @@ class TestRipper::Ripper < Test::Unit::TestCase
 
   def test_filename
     assert_equal '(ripper)', @ripper.filename
+    filename = "ripper"
+    ripper = Ripper.new("", filename)
+    filename.clear
+    assert_equal "ripper", ripper.filename
   end
 
   def test_lineno