Re: [RFC PATCH 1/3] gdb/nat: Use procfs(5) indexes in linux_common_core_of_thread

[Luis Machado <luis.machado@arm.com>]

On 3/21/24 23:11, Thiago Jung Bauermann wrote:
> The code and comment reference stat fields by made-up indexes.  The
> procfs(5) man page, which describes the /proc/PID/stat file, has a numbered
> list of these fields so it's more convenient to use those numbers instead.
> 
> This is currently an implementation detail inside the function so it's
> not really relevant with the code as-is, but a future patch will do some
> refactoring which will make the index more prominent.
> 
> Therefore, make this change in a separate patch so that it's simpler to
> review.
> ---
>  gdb/nat/linux-osdata.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/gdb/nat/linux-osdata.c b/gdb/nat/linux-osdata.c
> index c9192940f236..172fea5cea85 100644
> --- a/gdb/nat/linux-osdata.c
> +++ b/gdb/nat/linux-osdata.c
> @@ -75,10 +75,10 @@ linux_common_core_of_thread (ptid_t ptid)
>    if (pos == std::string::npos)
>      return -1;
>  
> -  /* If the first field after program name has index 0, then core number is
> -     the field with index 36 (so, the 37th).  There's no constant for that
> -     anywhere.  */
> -  for (int i = 0; i < 37; ++i)
> +  /* If the first field after program name has index 3, then core number is
> +     the field with index 39.  These are the indexes shown in the procfs(5)
> +     man page.  */
> +  for (int i = 3; i <= 39; ++i)
>      {
>        /* Find separator.  */
>        pos = content->find_first_of (' ', pos);

Looks ok to me.

See the comment about turning the numeric constants into named constants.

Reviewed-By: Luis Machado <luis.machado@arm.com>