* vm_insnhelper.c (vm_defined): skip respond_to_missing? when

a method is available.
  [Bug #11211]
* test/ruby/test_defined.rb: add a test for this fix.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50737 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,11 @@
+Wed Jun  3 04:34:39 2015  Koichi Sasada  <ko1@atdot.net>
+
+	* vm_insnhelper.c (vm_defined): skip respond_to_missing? when
+	  a method is available.
+	  [Bug #11211]
+
+	* test/ruby/test_defined.rb: add a test for this fix.
+
 Wed Jun  3 04:14:13 2015  Koichi Sasada  <ko1@atdot.net>
 
 	* insns.def (defined), vm_insnhelper.c (vm_defined):

test/ruby/test_defined.rb

@@ -208,4 +208,29 @@ class TestDefined < Test::Unit::TestCase
   def test_super_toplevel
     assert_separately([], "assert_nil(defined?(super))")
   end
+
+  class ExampleRespondToMissing
+    attr_reader :called
+
+    def initialize
+      @called = false
+    end
+
+    def respond_to_missing? *args
+      @called = true
+      false
+    end
+
+    def existing_method
+    end
+  end
+
+  def test_method_by_respond_to_missing
+    bug_11211 = '[Bug #11211]'
+    obj = ExampleRespondToMissing.new
+    assert_equal("method", defined?(obj.existing_method), bug_11211)
+    assert_equal(false, obj.called, bug_11211)
+    assert_equal(nil, defined?(obj.non_existing_method), bug_11211)
+    assert_equal(true, obj.called, bug_11211)
+  end
 end

vm_insnhelper.c

@@ -2456,15 +2456,12 @@ vm_defined(rb_thread_t *th, rb_control_frame_t *reg_cfp, rb_num_t op_type, VALUE
 
 	if (me) {
 	    const rb_method_definition_t *def = me->def;
-	    if (!(def->flag & NOEX_PRIVATE)) {
-		if (!((def->flag & NOEX_PROTECTED) &&
-		      !rb_obj_is_kind_of(GET_SELF(),
-					 rb_class_real(klass)))) {
-		    expr_type = DEFINED_METHOD;
-		}
+	    if (!(def->flag & NOEX_PRIVATE) &&
+		!((def->flag & NOEX_PROTECTED) && !rb_obj_is_kind_of(GET_SELF(), rb_class_real(klass)))) {
+		expr_type = DEFINED_METHOD;
 	    }
 	}
-	{
+	else {
 	    VALUE args[2];
 	    VALUE r;