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Re: [RFA] Reverse Debugging, 5/5


> Date: Fri, 03 Oct 2008 11:05:17 -0700
> From: Michael Snyder <msnyder@vmware.com>
> CC: "gdb-patches@sourceware.org" <gdb-patches@sourceware.org>,   "drow@false.org" <drow@false.org>,  "pedro@codesourcery.com" <pedro@codesourcery.com>,   "teawater@gmail.com" <teawater@gmail.com>
> 
> Eli Zaretskii wrote:
> >> Date: Thu, 02 Oct 2008 14:40:51 -0700
> >> From: Michael Snyder <msnyder@vmware.com>
> 
> >> The context is, the user says "show exec-direction"
> >> with a target that doesn't support reverse.
> >>
> >> Is it better to just say "Forward", with no comment,
> >> or is it better to let the user know that the question
> >> is not applicable?  Or both?
> > 
> > Both, I'd say.
> 
> OK, how about this?
> 
>    (gdb) show exec-direction
>    Forward (target `None' does not support exec-direction).

Fine with me.

> >>> Shouldn't we have some kind of caveat here regarding function prologue
> >>> and epilogue?
> >> Like what?
> >>
> >> If I've done my job right, prologues and epilogues
> >> should be handled transparently, just like they are
> >> when stepping forward.
> > 
> > Are they treated transparently when we step forward?  I had an
> > impression that in optimized code, they aren't always transparent.
> 
> OK, I should have said "we do our best to treat them
> transparently".  I suppose if the code is too optimized
> for us to do a good job when we're going forward, we will
> also have problems in reverse.

Yes, that's what I had in mind.  So perhaps the text should be a
little vaguer and maybe with some reasonable qualifier, like "unless
the code is too heavily optimized".  Maybe have that in a @footnote.


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