* iseq.c (Init_ISeq): undef ISeq.translate and ISeq.load_iseq

to prevent calling super classes' methods.

  Without this patch, you can write workaround like:

    class << RubyVM::InstructionSequence
      def translate; end
      undef translate
    end

* test/ruby/test_iseq.rb: add a test.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55656 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,17 @@
+Wed Jul 13 14:22:50 2016  Koichi Sasada  <ko1@atdot.net>
+
+	* iseq.c (Init_ISeq): undef ISeq.translate and ISeq.load_iseq
+	  to prevent calling super classes' methods.
+
+	  Without this patch, you can write workaround like:
+
+	    class << RubyVM::InstructionSequence
+	      def translate; end
+	      undef translate
+	    end
+
+	* test/ruby/test_iseq.rb: add a test.
+
 Wed Jul 13 14:16:03 2016  Koichi Sasada  <ko1@atdot.net>
 
 	* vm_method.c (method_entry_get_without_cache): check

iseq.c

@@ -2462,4 +2462,7 @@ Init_ISeq(void)
     rb_define_singleton_method(rb_cISeq, "disasm", iseqw_s_disasm, 1);
     rb_define_singleton_method(rb_cISeq, "disassemble", iseqw_s_disasm, 1);
     rb_define_singleton_method(rb_cISeq, "of", iseqw_s_of, 1);
+
+    rb_undef_method(CLASS_OF(rb_cISeq), "translate");
+    rb_undef_method(CLASS_OF(rb_cISeq), "load_iseq");
 }

test/ruby/test_iseq.rb

@@ -235,4 +235,14 @@ class TestISeq < Test::Unit::TestCase
     end
     assert_equal([m1, e1.message], [m2, e2.message], feature11951)
   end
+
+  def test_translate_by_object
+    assert_separately([], <<-"end;")
+      class Object
+        def translate
+        end
+      end
+      assert_equal(0, eval("0"))
+    end;
+  end
 end