--- a/hotspot/src/share/vm/oops/klass.cpp	Thu Feb 27 10:34:55 2014 +0100
+++ b/hotspot/src/share/vm/oops/klass.cpp	Thu Feb 27 10:36:50 2014 +0100
@@ -692,3 +692,21 @@
 }
 
 #endif
+
+/////////////// Unit tests ///////////////
+
+#ifndef PRODUCT
+
+class TestKlass {
+ public:
+  static void test_oop_is_instanceClassLoader() {
+    assert(SystemDictionary::ClassLoader_klass()->oop_is_instanceClassLoader(), "assert");
+    assert(!SystemDictionary::String_klass()->oop_is_instanceClassLoader(), "assert");
+  }
+};
+
+void TestKlass_test() {
+  TestKlass::test_oop_is_instanceClassLoader();
+}
+
+#endif

--- a/hotspot/src/share/vm/oops/klass.hpp	Thu Feb 27 10:34:55 2014 +0100
+++ b/hotspot/src/share/vm/oops/klass.hpp	Thu Feb 27 10:36:50 2014 +0100
@@ -498,6 +498,7 @@
   virtual bool oop_is_objArray_slow()       const { return false; }
   virtual bool oop_is_typeArray_slow()      const { return false; }
  public:
+  virtual bool oop_is_instanceClassLoader() const { return false; }
   virtual bool oop_is_instanceMirror()      const { return false; }
   virtual bool oop_is_instanceRef()         const { return false; }
 

--- a/hotspot/src/share/vm/oops/oop.hpp	Thu Feb 27 10:34:55 2014 +0100
+++ b/hotspot/src/share/vm/oops/oop.hpp	Thu Feb 27 10:36:50 2014 +0100
@@ -109,12 +109,13 @@
   int size_given_klass(Klass* klass);
 
   // type test operations (inlined in oop.inline.h)
-  bool is_instance()           const;
-  bool is_instanceMirror()     const;
-  bool is_instanceRef()        const;
-  bool is_array()              const;
-  bool is_objArray()           const;
-  bool is_typeArray()          const;
+  bool is_instance()            const;
+  bool is_instanceMirror()      const;
+  bool is_instanceClassLoader() const;
+  bool is_instanceRef()         const;
+  bool is_array()               const;
+  bool is_objArray()            const;
+  bool is_typeArray()           const;
 
  private:
   // field addresses in oop

--- a/hotspot/src/share/vm/oops/oop.inline.hpp	Thu Feb 27 10:34:55 2014 +0100
+++ b/hotspot/src/share/vm/oops/oop.inline.hpp	Thu Feb 27 10:36:50 2014 +0100
@@ -147,12 +147,13 @@
 
 inline bool oopDesc::is_a(Klass* k)        const { return klass()->is_subtype_of(k); }
 
-inline bool oopDesc::is_instance()           const { return klass()->oop_is_instance(); }
-inline bool oopDesc::is_instanceMirror()     const { return klass()->oop_is_instanceMirror(); }
-inline bool oopDesc::is_instanceRef()        const { return klass()->oop_is_instanceRef(); }
-inline bool oopDesc::is_array()              const { return klass()->oop_is_array(); }
-inline bool oopDesc::is_objArray()           const { return klass()->oop_is_objArray(); }
-inline bool oopDesc::is_typeArray()          const { return klass()->oop_is_typeArray(); }
+inline bool oopDesc::is_instance()            const { return klass()->oop_is_instance(); }
+inline bool oopDesc::is_instanceClassLoader() const { return klass()->oop_is_instanceClassLoader(); }
+inline bool oopDesc::is_instanceMirror()      const { return klass()->oop_is_instanceMirror(); }
+inline bool oopDesc::is_instanceRef()         const { return klass()->oop_is_instanceRef(); }
+inline bool oopDesc::is_array()               const { return klass()->oop_is_array(); }
+inline bool oopDesc::is_objArray()            const { return klass()->oop_is_objArray(); }
+inline bool oopDesc::is_typeArray()           const { return klass()->oop_is_typeArray(); }
 
 inline void*     oopDesc::field_base(int offset)        const { return (void*)&((char*)this)[offset]; }
 

--- a/hotspot/src/share/vm/prims/jni.cpp	Thu Feb 27 10:34:55 2014 +0100
+++ b/hotspot/src/share/vm/prims/jni.cpp	Thu Feb 27 10:36:50 2014 +0100
@@ -3877,6 +3877,7 @@
 void TestMetachunk_test();
 void TestVirtualSpaceNode_test();
 void TestNewSize_test();
+void TestKlass_test();
 #if INCLUDE_ALL_GCS
 void TestOldFreeSpaceCalculation_test();
 void TestG1BiasedArray_test();
@@ -3900,6 +3901,7 @@
     run_unit_test(AltHashing::test_alt_hash());
     run_unit_test(test_loggc_filename());
     run_unit_test(TestNewSize_test());
+    run_unit_test(TestKlass_test());
 #if INCLUDE_VM_STRUCTS
     run_unit_test(VMStructs::test());
 #endif