Q: Bug in comment/code in record_full_resume?

[Pedro Alves]

On 12/10/2014 07:13 PM, Andreas From wrote:
> Hi,
> 
> I am thinking this is a bug - in the comment or in the code. Either way, 
> I am confused about this code.
> 
> At the first assignment - 'step = 1' - as indicated by the comment on 
> the line above, a normal continue should mean having step == 0. At the 
> second step assignment the comment and the assignment match in content.

Recording works by forcing the target to single-step all the way,
and recording side effects at each single-step.

So here:

>        if (!step)

... GDB core told the target to continue ...

>          {
>            /* This is not hard single step.  */
>            if (!gdbarch_software_single_step_p (gdbarch))

... and the target/arch doesn't need software single-step, so ...

>              {
>                /* This is a normal continue.  */
>                step = 1;

... we can ask the target to do the single-step for us.  "step" is
passed to the target beneath a bit further below:

      ops->beneath->to_resume (ops->beneath, ptid, step, signal);

>              }

Thanks,
Pedro Alves