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Date: Sat, 21 Mar 2009 08:54:00 -0000
Message-ID: <daef60380903210154g532d541bod7dc6d27aa66f80c@mail.gmail.com>
Subject: Re: ProcessRecord problem with recursion
From: Hui Zhu <teawater@gmail.com>
To: Marc Khouzam <marc.khouzam@ericsson.com>
Cc: gdb@sourceware.org
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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> wro=
te:
> 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 =A0 =A0 =A0 int factorial(int x) {
> 2 =A0 =A0 =A0 =A0 =A0if (x =3D=3D 1) return 1;
> 3 =A0 =A0 =A0 =A0 =A0int result =3D x * factorial(x-1);
> 4 =A0 =A0 =A0 =A0 =A0return result;
> 5 =A0 =A0 =A0 }
> 6
> 7 =A0 =A0 =A0 int main() {
> 8 =A0 =A0 =A0 =A0 =A0 factorial(5);
> 9 =A0 =A0 =A0 =A0 =A0 return 0;
> 10 =A0 =A0 =A0}
> (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 =A0 =A0 =A0 =A0 =A0 factorial(5);
> (gdb) rec
> (gdb) s
> factorial (x=3D5) at a.cc:2
> 2 =A0 =A0 =A0 =A0 =A0if (x =3D=3D 1) return 1;
> (gdb) n
> 3 =A0 =A0 =A0 =A0 =A0int result =3D x * factorial(x-1);
> (gdb) n
> 4 =A0 =A0 =A0 =A0 =A0return result;
> (gdb) rn
> factorial (x=3D4) at a.cc:5
> 5 =A0 =A0 =A0 }
>
> Notice how the reverse-next(rn) command jumped to the end
> of the next factorial method on the stack (x=3D4 instead of x=3D5).
>
> Thanks
>
> Marc
>
>