Fix rhino memory limit issue

lib/execjs/ruby_rhino_runtime.rb

@@ -5,6 +5,7 @@ module ExecJS
         source = source.encode('UTF-8') if source.respond_to?(:encode)
 
         @rhino_context = ::Rhino::Context.new
+        fix_memory_limit! @rhino_context
         @rhino_context.eval(source)
       end
 
@@ -53,6 +54,16 @@ module ExecJS
           value
         end
       end
+
+      private
+        # Disables bytecode compiling which limits you to 64K scripts
+        def fix_memory_limit!(context)
+          if context.respond_to?(:optimization_level=)
+            context.optimization_level = -1
+          else
+            context.instance_eval { @native.setOptimizationLevel(-1) }
+          end
+        end
     end
 
     def name

test/test_runtime.rb

@@ -86,6 +86,11 @@ class TestRuntime < Test::Unit::TestCase
     assert_equal true, @runtime.exec("return this === (function() {return this})()")
   end
 
+  def test_compile_large_scripts
+    body = "var foo = 'bar';\n" * 100_000
+    assert @runtime.exec("function foo() {\n#{body}\n};\nreturn true")
+  end
+
   def test_syntax_error
     assert_raise ExecJS::RuntimeError do
       @runtime.exec(")")