* vm_method.c (rb_method_entry_make): fix WB miss.

Note that rb_method_entry_t::klass is not constified.
  We may  constify this field.
* test/ruby/test_alias.rb: add a test.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44234 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,11 @@
+Mon Dec 16 16:40:35 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* vm_method.c (rb_method_entry_make): fix WB miss.
+	  Note that rb_method_entry_t::klass is not constified.
+	  We may  constify this field.
+
+	* test/ruby/test_alias.rb: add a test.
+
 Mon Dec 16 14:14:22 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c: use gc_verify_internal_consistency() instead of

test/ruby/test_alias.rb

@@ -1,4 +1,5 @@
 require 'test/unit'
+require_relative 'envutils'
 
 class TestAlias < Test::Unit::TestCase
   class Alias0
@@ -119,4 +120,16 @@ class TestAlias < Test::Unit::TestCase
   def test_super_in_aliased_module_method # fails in 1.8
     assert_equal([:Base, :M], SuperInAliasedModuleMethod::Derived.new.bar)
   end
+
+  def test_alias
+    assert_normal_exit %q{
+      require 'stringio'
+      GC.verify_internal_consistency
+      GC.start
+      class StringIO
+        alias_method :read_nonblock, :sysread
+      end
+      GC.verify_internal_consistency
+    }
+  end
 end

vm_method.c

@@ -322,7 +322,7 @@ rb_method_entry_make(VALUE klass, ID mid, rb_method_type_t type,
     me->flag = NOEX_WITH_SAFE(noex);
     me->mark = 0;
     me->called_id = mid;
-    me->klass = defined_class;
+    OBJ_WRITE(klass, &me->klass, defined_class);
     me->def = def;
 
     if (def) {