--- a/hotspot/src/share/vm/classfile/javaClasses.cpp	Mon Oct 17 11:00:41 2011 -0700
+++ b/hotspot/src/share/vm/classfile/javaClasses.cpp	Mon Oct 17 21:38:29 2011 -0700
@@ -503,12 +503,8 @@
   if (SystemDictionary::Class_klass_loaded() && (k->oop_is_instance() || k->oop_is_javaArray())) {
     // Allocate mirror (java.lang.Class instance)
     Handle mirror = instanceMirrorKlass::cast(SystemDictionary::Class_klass())->allocate_instance(k, CHECK_0);
-    // Setup indirections
-    mirror->obj_field_put(_klass_offset,  k());
-    k->set_java_mirror(mirror());
 
     instanceMirrorKlass* mk = instanceMirrorKlass::cast(mirror->klass());
-    java_lang_Class::set_oop_size(mirror(), mk->instance_size(k));
     java_lang_Class::set_static_oop_field_count(mirror(), mk->compute_static_oop_field_count(mirror()));
 
     // It might also have a component mirror.  This mirror must already exist.
@@ -571,9 +567,10 @@
     assert(aklass != NULL, "correct bootstrap");
     set_array_klass(java_class, aklass);
   }
+#ifdef ASSERT
   instanceMirrorKlass* mk = instanceMirrorKlass::cast(SystemDictionary::Class_klass());
-  java_lang_Class::set_oop_size(java_class, mk->instance_size(oop(NULL)));
-  java_lang_Class::set_static_oop_field_count(java_class, 0);
+  assert(java_lang_Class::static_oop_field_count(java_class) == 0, "should have been zeroed by allocation");
+#endif
   return java_class;
 }
 
@@ -587,6 +584,12 @@
 }
 
 
+void java_lang_Class::set_klass(oop java_class, klassOop klass) {
+  assert(java_lang_Class::is_instance(java_class), "must be a Class object");
+  java_class->obj_field_put(_klass_offset, klass);
+}
+
+
 void java_lang_Class::print_signature(oop java_class, outputStream* st) {
   assert(java_lang_Class::is_instance(java_class), "must be a Class object");
   Symbol* name = NULL;

--- a/hotspot/src/share/vm/classfile/javaClasses.hpp	Mon Oct 17 11:00:41 2011 -0700
+++ b/hotspot/src/share/vm/classfile/javaClasses.hpp	Mon Oct 17 21:38:29 2011 -0700
@@ -188,6 +188,7 @@
   static oop  create_basic_type_mirror(const char* basic_type_name, BasicType type, TRAPS);
   // Conversion
   static klassOop as_klassOop(oop java_class);
+  static void set_klass(oop java_class, klassOop klass);
   static BasicType as_BasicType(oop java_class, klassOop* reference_klass = NULL);
   static BasicType as_BasicType(oop java_class, KlassHandle* reference_klass) {
     klassOop refk_oop = NULL;

--- a/hotspot/src/share/vm/gc_interface/collectedHeap.cpp	Mon Oct 17 11:00:41 2011 -0700
+++ b/hotspot/src/share/vm/gc_interface/collectedHeap.cpp	Mon Oct 17 21:38:29 2011 -0700
@@ -28,6 +28,7 @@
 #include "gc_interface/collectedHeap.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "oops/oop.inline.hpp"
+#include "oops/instanceMirrorKlass.hpp"
 #include "runtime/init.hpp"
 #include "services/heapDumper.hpp"
 #ifdef TARGET_OS_FAMILY_linux
@@ -436,3 +437,37 @@
     inspector.doit();
   }
 }
+
+oop CollectedHeap::Class_obj_allocate(KlassHandle klass, int size, KlassHandle real_klass, TRAPS) {
+  debug_only(check_for_valid_allocation_state());
+  assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");
+  assert(size >= 0, "int won't convert to size_t");
+  HeapWord* obj;
+  if (JavaObjectsInPerm) {
+    obj = common_permanent_mem_allocate_init(size, CHECK_NULL);
+  } else {
+    assert(ScavengeRootsInCode > 0, "must be");
+    obj = common_mem_allocate_init(size, CHECK_NULL);
+  }
+  post_allocation_setup_common(klass, obj, size);
+  assert(Universe::is_bootstrapping() ||
+         !((oop)obj)->blueprint()->oop_is_array(), "must not be an array");
+  NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));
+  oop mirror = (oop)obj;
+
+  java_lang_Class::set_oop_size(mirror, size);
+
+  // Setup indirections
+  if (!real_klass.is_null()) {
+    java_lang_Class::set_klass(mirror, real_klass());
+    real_klass->set_java_mirror(mirror);
+  }
+
+  instanceMirrorKlass* mk = instanceMirrorKlass::cast(mirror->klass());
+  assert(size == mk->instance_size(real_klass), "should have been set");
+
+  // notify jvmti and dtrace
+  post_allocation_notify(klass, (oop)obj);
+
+  return mirror;
+}

--- a/hotspot/src/share/vm/gc_interface/collectedHeap.hpp	Mon Oct 17 11:00:41 2011 -0700
+++ b/hotspot/src/share/vm/gc_interface/collectedHeap.hpp	Mon Oct 17 21:38:29 2011 -0700
@@ -319,6 +319,9 @@
   // VM (then terminate).
   virtual void preload_and_dump(TRAPS) { ShouldNotReachHere(); }
 
+  // Allocate and initialize instances of Class
+  static oop Class_obj_allocate(KlassHandle klass, int size, KlassHandle real_klass, TRAPS);
+
   // General obj/array allocation facilities.
   inline static oop obj_allocate(KlassHandle klass, int size, TRAPS);
   inline static oop array_allocate(KlassHandle klass, int size, int length, TRAPS);

--- a/hotspot/src/share/vm/oops/instanceMirrorKlass.cpp	Mon Oct 17 11:00:41 2011 -0700
+++ b/hotspot/src/share/vm/oops/instanceMirrorKlass.cpp	Mon Oct 17 21:38:29 2011 -0700
@@ -288,15 +288,7 @@
   // Query before forming handle.
   int size = instance_size(k);
   KlassHandle h_k(THREAD, as_klassOop());
-  instanceOop i;
-
-  if (JavaObjectsInPerm) {
-    i = (instanceOop) CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL);
-  } else {
-    assert(ScavengeRootsInCode > 0, "must be");
-    i = (instanceOop) CollectedHeap::obj_allocate(h_k, size, CHECK_NULL);
-  }
-
+  instanceOop i = (instanceOop) CollectedHeap::Class_obj_allocate(h_k, size, k, CHECK_NULL);
   return i;
 }