Re: [patch/rfc,6.1?] Use right frame ID in step_over_function

[Daniel Jacobowitz <drow at false dot org>]

On Sat, Feb 28, 2004 at 11:33:51PM -0500, Andrew Cagney wrote:
> Hello,
> 
> This goes into the "how did it ever work" category.  The idea of 
> step_over_function is that it:
> 
> - finds the caller's resume address
> - finds the caller's frame ID
> 
> and then sets a breakpoint for that caller instance of the function. 
> The current code:
> 
> - finds the caller's resume address
> - finds the _callee_ frame ID
> 
> and then uses that to set the breakpoint.  Now that is plain weird!  It 
> only works because either:
> 
> - the step_frame_id patches up the bug
> 
> - the values match as GDB is using the inner-most, rather than 
> outer-most frame address as part of the frame ID
> 
> The bug apepars when trying to step over nested shared library non-debug 
> info functions (making sense?).

No, not really.  Could you give us a testcase?  What platform have you
seen this behavior on?

> I'll follow this up after 6.1 branch is in place.
> 
> Its pretty heavy a change to apply to that branch and this late. 
> However, like Joel's related patch, I suspect it will be needed :-/
> 
> Andrew
> 
> PS: Why do I have this feeling of dejavu?

Because we discussed this problem in July 2003 and neither of us had
time to come back to the issue?

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer