Total number of WNames in collision buckets (included in mCount along with primary entries)

Index of the first unused collision bucket entry (== size of the used portion of collision list): less than or equal to 0xFF (255), since max number of entries is 255 (8-bit, minus 0 used as 'empty' marker)

Array of heads of collision bucket chains; size dynamically

Flag that indicates whether underlying data structures for the collision list are shared or not. If they are, then they need to be handled in copy-on-write way, i.e. if they need to be modified, a copy needs to be made first; at this point it will not be shared any more, and can be modified.

This flag needs to be checked when adding new collision entries.

Total number of WNames in the symbol table

Array of 2^N size, which contains combination of 24-bits of hash (0 to indicate 'empty' slot), and 8-bit collision bucket index (0 to indicate empty collision bucket chain; otherwise subtract one from index)

Mask used to truncate 32-bit hash value to current hash array size; essentially, hash array size - 1 (since hash array sizes are 2^N).

Flag that indicates whether underlying data structures for the main hash area are shared or not. If they are, then they need to be handled in copy-on-write way, i.e. if they need to be modified, a copy needs to be made first; at this point it will not be shared any more, and can be modified.

This flag needs to be checked both when adding new main entries, and when adding new collision list queues (i.e. creating a new collision list head entry)

Array that contains WName instances matching entries in mMainHash. Contains nulls for unused entries.

This flag is set if, after adding a new entry, it is deemed that a rehash is warranted if any more entries are to be added.