merge revision(s) 45367,45387,45388,45389: [Backport #9475]

* vm_method.c (rb_method_entry_get_without_cache): me->klass is 0
  for a method aliased in a module.  [ruby-core:61636] [Bug #9663]

* vm_method.c (rb_method_entry_get_without_cache): get rid of
  infinite recursion at aliases in a subclass and a superclass.
  return actually defined class for other than singleton class.
  [ruby-core:60431] [Bug #9475]



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@45750 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,15 @@
+Wed Apr 30 16:15:09 2014  Kohei Suzuki  <eagletmt@gmail.com>
+
+	* vm_method.c (rb_method_entry_get_without_cache): me->klass is 0
+	  for a method aliased in a module.  [ruby-core:61636] [Bug #9663]
+
+Wed Apr 30 16:15:09 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* vm_method.c (rb_method_entry_get_without_cache): get rid of
+	  infinite recursion at aliases in a subclass and a superclass.
+	  return actually defined class for other than singleton class.
+	  [ruby-core:60431] [Bug #9475]
+
 Wed Apr 30 16:09:18 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* vm_insnhelper.c (vm_callee_setup_arg): turn a macro into an

test/ruby/test_alias.rb

@@ -1,4 +1,5 @@
 require 'test/unit'
+require 'envutil'
 
 class TestAlias < Test::Unit::TestCase
   class Alias0
@@ -129,4 +130,66 @@ 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_cyclic_zsuper
+    bug9475 = '[ruby-core:60431] [Bug #9475]'
+
+    a = Module.new do
+      def foo
+        "A"
+      end
+    end
+
+    b = Class.new do
+      include a
+      attr_reader :b
+
+      def foo
+        @b ||= 0
+        raise SystemStackError if (@b += 1) > 1
+        # "foo from B"
+        super + "B"
+      end
+    end
+
+    c = Class.new(b) do
+      alias orig_foo foo
+
+      def foo
+        # "foo from C"
+        orig_foo + "C"
+      end
+    end
+
+    b.class_eval do
+      alias orig_foo foo
+      attr_reader :b2
+
+      def foo
+        @b2 ||= 0
+        raise SystemStackError if (@b2 += 1) > 1
+        # "foo from B (again)"
+        orig_foo + "B2"
+      end
+    end
+
+    assert_nothing_raised(SystemStackError, bug9475) do
+      assert_equal("ABC", c.new.foo, bug9475)
+    end
+  end
+
+  def test_alias_in_module
+    bug9663 = '[ruby-core:61635] [Bug #9663]'
+
+    assert_separately(['-', bug9663], <<-'end;')
+      bug = ARGV[0]
+
+      m = Module.new do
+        alias orig_to_s to_s
+      end
+
+      o = Object.new.extend(m)
+      assert_equal(o.to_s, o.orig_to_s, bug)
+    end;
+  end
 end

version.h

@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.0.0"
 #define RUBY_RELEASE_DATE "2014-04-30"
-#define RUBY_PATCHLEVEL 470
+#define RUBY_PATCHLEVEL 471
 
 #define RUBY_RELEASE_YEAR 2014
 #define RUBY_RELEASE_MONTH 4

vm_method.c

@@ -534,8 +534,15 @@ rb_method_entry_get_without_cache(VALUE klass, ID id,
     VALUE defined_class;
     rb_method_entry_t *me = search_method(klass, id, &defined_class);
 
-    if (me && RB_TYPE_P(me->klass, T_ICLASS))
+    if (me && me->klass) {
+	switch (BUILTIN_TYPE(me->klass)) {
+	  case T_CLASS:
+	    if (RBASIC(klass)->flags & FL_SINGLETON) break;
+	    /* fall through */
+	  case T_ICLASS:
 	    defined_class = me->klass;
+	}
+    }
 
     if (ruby_running) {
 	struct cache_entry *ent;