[PATCH 1/7] Regcache: Subclass ptid functionality to target_regcache

[Yao Qi]

Alan Hayward <Alan.Hayward@arm.com> writes:

> All ptid related functions are moved to target_regcache.
>

What is the rationale of this change?  The regcache is per-thread, even
it is disconnected from target.

> A regcache retains the ptid () method, which always returns -1.

ptid_t (-1) is minus_one_ptid, which has a special meaning.

> This ensures users can always test if a regcache is attached to a
> target, without needing to know if it is a target_regcache.

When do we need such test ("if a regcache is attached to a target")?

-- 
Yao (齐尧)