Watchpoint single-stepping.

[Michael Snyder]

On Sun, 2006-10-08 at 21:01 +0100, Rob Quill wrote:
> Hi,
> 
> Thanks for your help. What I am trying to do is mimic the way a
> software watchpoint works, in that I want to make GDB single-step
> through the program and then compare the values of the current
> variables to some other values. What suggestions would you have for
> implementing this, as I'm not sure how to go about it becasue there is
> no documentation in GDB Internals on how single-stepping is done.

This is a tall order.  Even to attempt to explain how gdb works 
in this area would be a big effort.  I suggest that, if you want
to do something that works kind of like a watchpoint, you spend
some time figuring out how watchpoints work.  Set a watchpoint, 
then step thru the gdb code to figure out how it works.  Concentrate
on infrun.c and breakpoint.c.

Take lots of notes.  ;-)

> On a side note, does GDB maintain a internal model of the control flow
> graph of the program being executed.

No.  Nothing even remotely similar.