typedef struct _HEAP_ENTRY_EXTRA
{
    union
    {
        struct
        {
            unsigned short AllocatorBackTraceIndex;
            unsigned short TagIndex;
            unsigned __int64 Settable;
        };
        struct
        {
            unsigned __int64 ZeroInit;
            unsigned __int64 ZeroInit1;
        };
    };
} HEAP_ENTRY_EXTRA, *PHEAP_ENTRY_EXTRA;