Re: [RFA/RFC Prec] Add Linux AMD64 process record support second version, (AMD64 Linux system call support) 3/3

[Hui Zhu <teawater at gmail dot com>]

On Sat, Jul 18, 2009 at 09:14, Michael Snyder<msnyder@vmware.com> wrote:
> Hui Zhu wrote:
>
>
>> + ?/* Convert tmpulongest to number in record_linux_system_call. ?*/
>> + ?switch (tmpulongest)
>> + ? ?{
>> + ? ? ?/* sys_read */
>> + ? ?case 0:
>> + ? ? ?num = 3;
>> + ? ? ?break;
>> + ? ? ?/* sys_write */
>> + ? ?case 1:
>> + ? ? ?num = 4;
>> + ? ? ?break;
>
> Hey Hui,
>
> This switch statement is over 1000 lines long! ?;-)
>
> It's OK, there's no real rule against that, but it just
> makes me think about whether shortening it might make it
> any easier to read and maintain...
>
> I thought of suggesting a look-up table, but that would
> actually make it harder to read and maintain, I think...
>
> What about this? ?If you wrote it this way...
>
> ? ? ? ?case 1: ? ? ? ? /* sys_write */
>
> you'd save over 250 lines, and I think it would be more readable.
>
> And then, if you abstracted the switch statement out
> into a separate function, you could code it like this...
>
> ? ? ? ?case 1: ? ? ? ? /* sys_write */
> ? ? ? ? ?return 4;
> ? ? ? ?case 2: ? ? ? ? /* sys_open */
>
> and save another 250 lines, cutting the whole thing by half.
> You'd have to special-case number 158, of course.
>
> I leave it up to you, you can decide.
>
> Other than that it looks fine. ?Mark?
>
>
>

That is really a big work.  Please let me post a special patch for it later.

Thanks,
Hui