Re: ProcessRecord problem with recursion

[Hui Zhu <teawater at gmail dot com>]

Hi Marc,

I had post a patch for it in
http://sourceware.org/ml/gdb-patches/2009-03/msg00428.html

Thanks,
Hui

On Fri, Mar 20, 2009 at 09:13, Marc Khouzam <marc.khouzam@ericsson.com> wrote:
> Hi,
>
> I'm having problems with ProcessRecord and recursion.
> It looks like the reverse-next operation behaves like
> reverse-step when dealing with a recursive method.
>
> I have GDB HEAD from the 18th of March, with the patches included in
> http://sourceware.org/ml/gdb-patches/2009-03/msg00375.html
> http://sourceware.org/ml/gdb-patches/2009-03/msg00005.html
> http://sourceware.org/ml/gdb-patches/2009-01/msg00444.html
>
> Here is a program and session that shows the problem:
>
> GNU gdb (GDB) 6.8.50.20090318-cvs
> [...]
> (gdb) l
> 1 ? ? ? int factorial(int x) {
> 2 ? ? ? ? ?if (x == 1) return 1;
> 3 ? ? ? ? ?int result = x * factorial(x-1);
> 4 ? ? ? ? ?return result;
> 5 ? ? ? }
> 6
> 7 ? ? ? int main() {
> 8 ? ? ? ? ? factorial(5);
> 9 ? ? ? ? ? return 0;
> 10 ? ? ?}
> (gdb) start
> Temporary breakpoint 1 at 0x804847b: file a.cc, line 8.
> Starting program: /local/home/lmckhou/testing/a.out
>
> Temporary breakpoint 1, main () at a.cc:8
> 8 ? ? ? ? ? factorial(5);
> (gdb) rec
> (gdb) s
> factorial (x=5) at a.cc:2
> 2 ? ? ? ? ?if (x == 1) return 1;
> (gdb) n
> 3 ? ? ? ? ?int result = x * factorial(x-1);
> (gdb) n
> 4 ? ? ? ? ?return result;
> (gdb) rn
> factorial (x=4) at a.cc:5
> 5 ? ? ? }
>
> Notice how the reverse-next(rn) command jumped to the end
> of the next factorial method on the stack (x=4 instead of x=5).
>
> Thanks
>
> Marc
>
>