Re: [RFA][2/5] New port: Cell BE SPU (valops.c fix)

Daniel Jacobowitz
2006-12-06T17:12:42Z

On Wed, Dec 06, 2006 at 06:10:04PM +0100, Ulrich Weigand wrote:
> Daniel Jacobowitz wrote:
>
> > Vladimir has actually been working on a similar change for a different
> > purpose. He added a "parent value" pointer to values; bitfields then
> > are accessed by reading the enclosing structure and extracting bits
> > from value_contents.
>
> Can you point me to the patch? I didn't find it on the gdb-patches list ...

It hasn't been posted yet - it's not quite done.

> > What do you think? Would this solve the same problem as your patch?
>
> Depending on the circumstances when a "child" value is generated, it
> may solve the same problem. To solve the register value problem,
> we would need to make sure that accessing a component of a value in
> a register would create a "child" value, and v_t_r is always only
> ever called on the (grand-)parent that corresponds to the value
> originally retrieved by r_t_v.

Right. The current version only did this for bitfields in memory,
rather than fields in registers, but it shouldn't be hard to extend.
Does that make sense, Vlad?

--
Daniel Jacobowitz
CodeSourcery