Re: [reverse RFA] no singlestep-over-BP in reverse

teawater
2008-09-16T04:13:16Z

I think is before exec the next instruction, the GDB will get breakpoint trap.

But I found that there is a bug in inside record replay mode, I stop
the GDB after exec the instruction.
Michael, how do you deal with the breakpoint in gdb-freeplay and vmware record?

Hui

On Tue, Sep 16, 2008 at 02:42, Daniel Jacobowitz <drow@false.org> wrote:
>
> On Mon, Sep 15, 2008 at 11:31:33AM -0700, Michael Snyder wrote:
> > When we're stopped at a breakpoint and we want to
> > continue in reverse, we're not actually going to
> > execute the instruction at the breakpoint -- we're
> > going to de-execute the previous instruction.
> >
> > Therefore there's no need to singlestep before
> > inserting breakpoints. In fact it would be a bad
> > idea to do so, because if there is a breakpoint at
> > the previous instruction, we WANT to hit it.
> >
> > Note that this patch is to be applied to the reverse branch.
>
> If there is a breakpoint on the previous instruction, will you hit it
> before or after de-executing that instruction? It seems like this
> logic should be somehow still necessary... but I can't put my finger
> on when.
>
> --
> Daniel Jacobowitz
> CodeSourcery