ko1	2013-02-16 16:41:55 +0900 (Sat, 16 Feb 2013)

  New Revision: 39276

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=39276

  Log:
    * vm.c (rb_thread_mark): mark a working Proc of bmethod
      (a method defined by define_method) even if the method was removed.
      We could not trace working Proc object which represents the body
      of bmethod if the method was removed (alias/undef/overridden).
      Simply, it was mark miss.
      This patch by Kazuki Tsujimoto. [Bug #7825]
      NOTE: We can brush up this marking because we do not need to mark
      `me' on each living control frame. We need to mark `me's
      only if `me' was free'ed. This is future work after Ruby 2.0.0.
    * test/ruby/test_method.rb: add a test.

  Modified files:
    trunk/ChangeLog
    trunk/test/ruby/test_method.rb
    trunk/vm.c

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 39275)
+++ ChangeLog	(revision 39276)
@@ -1,3 +1,18 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1
+Sat Feb 16 16:08:35 2013  Koichi Sasada  <ko1@a...>
+
+	* vm.c (rb_thread_mark): mark a working Proc of bmethod
+	  (a method defined by define_method) even if the method was removed.
+	  We could not trace working Proc object which represents the body
+	  of bmethod if the method was removed (alias/undef/overridden).
+	  Simply, it was mark miss.
+	  This patch by Kazuki Tsujimoto. [Bug #7825]
+
+	  NOTE: We can brush up this marking because we do not need to mark
+	  `me' on each living control frame. We need to mark `me's
+	  only if `me' was free'ed. This is future work after Ruby 2.0.0.
+
+	* test/ruby/test_method.rb: add a test.
+
 Sat Feb 16 15:45:56 2013  Koichi Sasada  <ko1@a...>
 
 	* proc.c (rb_binding_new_with_cfp): create binding object even if
Index: vm.c
===================================================================
--- vm.c	(revision 39275)
+++ vm.c	(revision 39276)
@@ -1782,7 +1782,11 @@ rb_thread_mark(void *ptr) https://github.com/ruby/ruby/blob/trunk/vm.c#L1782
 		if (iseq) {
 		    rb_gc_mark(RUBY_VM_NORMAL_ISEQ_P(iseq) ? iseq->self : (VALUE)iseq);
 		}
-		if (cfp->me) ((rb_method_entry_t *)cfp->me)->mark = 1;
+		if (cfp->me) {
+		    /* TODO: marking `me' can be more sophisticated way */
+		    ((rb_method_entry_t *)cfp->me)->mark = 1;
+		    rb_mark_method_entry(cfp->me);
+		}
 		cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
 	    }
 	}
Index: test/ruby/test_method.rb
===================================================================
--- test/ruby/test_method.rb	(revision 39275)
+++ test/ruby/test_method.rb	(revision 39276)
@@ -561,4 +561,18 @@ class TestMethod < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_method.rb#L561
     }
     assert_equal(c, c.instance_method(:foo).owner, bug7836)
   end
+
+  def test_gced_bmethod
+    assert_normal_exit %q{
+      require 'irb'
+      IRB::Irb.module_eval do
+        define_method(:eval_input) do
+          IRB::Irb.module_eval { alias_method :eval_input, :to_s }
+          GC.start
+          Kernel
+        end
+      end
+      IRB.start
+    }, '[Bug #7825]'
+  end
 end

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