--- old/src/share/vm/oops/klass.hpp	2011-12-07 12:03:23.000000000 +0100
+++ new/src/share/vm/oops/klass.hpp	2011-12-07 12:03:23.000000000 +0100
@@ -313,7 +313,7 @@
   // Can this klass be a primary super?  False for interfaces and arrays of
   // interfaces.  False also for arrays or classes with long super chains.
   bool can_be_primary_super() const {
-    const juint secondary_offset = secondary_super_cache_offset_in_bytes() + sizeof(oopDesc);
+    const juint secondary_offset = secondary_super_cache_offset_in_bytes();
     return super_check_offset() != secondary_offset;
   }
   virtual bool can_be_primary_super_slow() const;
@@ -323,7 +323,7 @@
     if (!can_be_primary_super()) {
       return primary_super_limit();
     } else {
-      juint d = (super_check_offset() - (primary_supers_offset_in_bytes() + sizeof(oopDesc))) / sizeof(klassOop);
+      juint d = (super_check_offset() - primary_supers_offset_in_bytes()) / sizeof(klassOop);
       assert(d < primary_super_limit(), "oob");
       assert(_primary_supers[d] == as_klassOop(), "proper init");
       return d;
@@ -373,15 +373,15 @@
   virtual void set_alloc_size(juint n) = 0;
 
   // Compiler support
-  static int super_offset_in_bytes()         { return offset_of(Klass, _super); }
-  static int super_check_offset_offset_in_bytes() { return offset_of(Klass, _super_check_offset); }
-  static int primary_supers_offset_in_bytes(){ return offset_of(Klass, _primary_supers); }
-  static int secondary_super_cache_offset_in_bytes() { return offset_of(Klass, _secondary_super_cache); }
-  static int secondary_supers_offset_in_bytes() { return offset_of(Klass, _secondary_supers); }
-  static int java_mirror_offset_in_bytes()   { return offset_of(Klass, _java_mirror); }
-  static int modifier_flags_offset_in_bytes(){ return offset_of(Klass, _modifier_flags); }
-  static int layout_helper_offset_in_bytes() { return offset_of(Klass, _layout_helper); }
-  static int access_flags_offset_in_bytes()  { return offset_of(Klass, _access_flags); }
+  static int super_offset_in_bytes()                 { return sizeof(klassOopDesc) + offset_of(Klass, _super); }
+  static int super_check_offset_offset_in_bytes()    { return sizeof(klassOopDesc) + offset_of(Klass, _super_check_offset); }
+  static int primary_supers_offset_in_bytes()        { return sizeof(klassOopDesc) + offset_of(Klass, _primary_supers); }
+  static int secondary_super_cache_offset_in_bytes() { return sizeof(klassOopDesc) + offset_of(Klass, _secondary_super_cache); }
+  static int secondary_supers_offset_in_bytes()      { return sizeof(klassOopDesc) + offset_of(Klass, _secondary_supers); }
+  static int java_mirror_offset_in_bytes()           { return sizeof(klassOopDesc) + offset_of(Klass, _java_mirror); }
+  static int modifier_flags_offset_in_bytes()        { return sizeof(klassOopDesc) + offset_of(Klass, _modifier_flags); }
+  static int layout_helper_offset_in_bytes()         { return sizeof(klassOopDesc) + offset_of(Klass, _layout_helper); }
+  static int access_flags_offset_in_bytes()          { return sizeof(klassOopDesc) + offset_of(Klass, _access_flags); }
 
   // Unpacking layout_helper:
   enum {
@@ -478,7 +478,7 @@
   bool is_subtype_of(klassOop k) const {
     juint    off = k->klass_part()->super_check_offset();
     klassOop sup = *(klassOop*)( (address)as_klassOop() + off );
-    const juint secondary_offset = secondary_super_cache_offset_in_bytes() + sizeof(oopDesc);
+    const juint secondary_offset = secondary_super_cache_offset_in_bytes();
     if (sup == k) {
       return true;
     } else if (off != secondary_offset) {
@@ -674,7 +674,7 @@
   // are potential problems in setting the bias pattern for
   // JVM-internal oops.
   inline void set_prototype_header(markOop header);
-  static int prototype_header_offset_in_bytes() { return offset_of(Klass, _prototype_header); }
+  static int prototype_header_offset_in_bytes() { return sizeof(klassOopDesc) + offset_of(Klass, _prototype_header); }
 
   int  biased_lock_revocation_count() const { return (int) _biased_lock_revocation_count; }
   // Atomically increments biased_lock_revocation_count and returns updated value