anonymous on Tue Jul 28 18:01:16 2009, syntax: C++ 
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class Item
{
public:

protected:
  union {
      struct {
         union {
            int32 val32;
            int64 val64;
            numeric number;
            Garbageable *content;

            struct {
               void *voidp;
               void *extra;
            } ptr;

            struct {
               GarbagePointer *gcptr;
               int32 signature;
            } gptr;

         } data;

         CallPoint *method;

         union {
            struct {
               byte type;         // <<<< Move this as third field
               byte flags;
               byte oldType;
               byte methodId;
            } bits;
            uint16 half;
            uint32 whole;
         } base;
      } ctx;

      struct {
         uint64 low;
         uint64 high;
      } parts;
   } all;

// ....
public:

//....

   inline void copy( const Item &other )
   {
      #ifdef _SPARC32_ITEM_HACK   // <<<<< do NOT define this
      register int32 *pthis, *pother;
      pthis = (int32*) this;
      pother = (int32*) &other;
      pthis[0]= pother[0];
      pthis[1]= pother[1];
      pthis[2]= pother[2];
      pthis[3]= pother[3];

      #else
         all = other.all;
      #endif
   }

   inline    byte type() const { return all.ctx.base.bits.type; }
   inline    void type( byte nt ) { all.ctx.base.bits.flags = 0; all.ctx.base.bits.type = nt; }
//...
};
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