Re: [Valgrind-users] New skin available: Annelid, a pointer-misu echecker

[Nicholas N. <nj...@ca...>]

On Wed, 1 Oct 2003, Jeremy Fitzhardinge wrote:

> > * If you generate a new pointer/integer by math between two operands
> >   with different malloc-area sets then the new integer gets the union
> >   of the sets.
>
> Yep, this is what I suggested.

But the sets become huge (eg. 1000s of entries), which slows things down
horrifically.  Besides, when you do the pointer subtraction, that
"connection" between them is really a property of the ptrdiff, not a
property of the segments, so putting the two segments into the same set
isn't a true reflection of what's happening.

These two reasons are why I think having a dedicated ptrdiff type is a
better solution.  Although I haven't implemented it yet, so I'm yet to see
how it works in practice.

N