--- a/src/share/vm/oops/klass.hpp	Fri Feb 24 18:30:42 2012 -0800
+++ b/src/share/vm/oops/klass.hpp	Mon Feb 27 13:10:13 2012 +0100
@@ -33,6 +33,7 @@
 #include "oops/klassPS.hpp"
 #include "oops/oop.hpp"
 #include "runtime/orderAccess.hpp"
+#include "trace/traceMacros.hpp"
 #include "utilities/accessFlags.hpp"
 #ifndef SERIALGC
 #include "gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp"
@@ -80,6 +81,7 @@
 //    [last_biased_lock_bulk_revocation_time] (64 bits)
 //    [prototype_header]
 //    [biased_lock_revocation_count]
+//    [trace_id]
 
 
 // Forward declarations.
@@ -265,6 +267,7 @@
   markOop  _prototype_header;   // Used when biased locking is both enabled and disabled for this type
   jint     _biased_lock_revocation_count;
 
+  TRACE_DEFINE_KLASS_TRACE_ID;
  public:
 
   // returns the enclosing klassOop
@@ -315,7 +318,7 @@
   // 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 = in_bytes(secondary_super_cache_offset());
     return super_check_offset() != secondary_offset;
   }
   virtual bool can_be_primary_super_slow() const;
@@ -325,7 +328,7 @@
     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() - in_bytes(primary_supers_offset())) / sizeof(klassOop);
       assert(d < primary_super_limit(), "oob");
       assert(_primary_supers[d] == as_klassOop(), "proper init");
       return d;
@@ -380,16 +383,16 @@
   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 graal_mirror_offset_in_bytes()  { return offset_of(Klass, _graal_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 ByteSize super_offset()                 { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _super)); }
+  static ByteSize super_check_offset_offset()    { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _super_check_offset)); }
+  static ByteSize primary_supers_offset()        { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _primary_supers)); }
+  static ByteSize secondary_super_cache_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _secondary_super_cache)); }
+  static ByteSize secondary_supers_offset()      { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _secondary_supers)); }
+  static ByteSize java_mirror_offset()           { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _java_mirror)); }
+  static ByteSize modifier_flags_offset()        { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _modifier_flags)); }
+  static ByteSize layout_helper_offset()         { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _layout_helper)); }
+  static ByteSize access_flags_offset()          { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _access_flags)); }
+  static ByteSize graal_mirror_offset()          { return in_ByteSize(sizeof(klassOopDesc) + offset_of(Klass, _graal_mirror)); }
 
   // Unpacking layout_helper:
   enum {
@@ -486,7 +489,7 @@
   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 = in_bytes(secondary_super_cache_offset());
     if (sup == k) {
       return true;
     } else if (off != secondary_offset) {
@@ -682,7 +685,7 @@
   // 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 ByteSize prototype_header_offset() { return in_ByteSize(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
@@ -691,6 +694,7 @@
   jlong last_biased_lock_bulk_revocation_time() { return _last_biased_lock_bulk_revocation_time; }
   void  set_last_biased_lock_bulk_revocation_time(jlong cur_time) { _last_biased_lock_bulk_revocation_time = cur_time; }
 
+  TRACE_DEFINE_KLASS_METHODS;
 
   // garbage collection support
   virtual void follow_weak_klass_links(