Re: MI: type prefixes for values

Vladimir Prus
2006-04-07T05:54:32Z

On Thursday 06 April 2006 20:53, Jim Ingham wrote:

> > The case I'm not sure about is this:
> >
> > 1. main calls 'a' which calls 'b' which bits breakpoint.
> > 2 varobj is created for local var of 'b'
> > 3. Users says 'continue'.
> > 4. 'b' exists and then 'a' calls 'b' again and breakpoint is
> > hit again.
> >
> > However, this second time it's not guaranteed that stack frame of
> > 'b' is at
> > the same address as it was the last time -- maybe 'a' has pushed
> > something on
> > stack. How do you detect this case?
>
> I said this in another response, but to be clear, Xcode stores the
> frame_id's from each stack frame when it stops. It holds onto this,
> and when it stops again it checks this fingerprint against the new
> frame id's, and the throws away all the varobj's from the point the
> frame_id's vary on to the bottom of stack. There's no ambiguity if
> you do this.

Then, Xcode has to get frame_id of the current frame from gdb, right? Where
frame is is (stack address + code address). The code address is readily
available, but I see no way to get stack address. Is that something you've
added?

- Volodya