Can I use variable in place of repeat count in Examine command GDB, x/10xw Address

Question

In Examine command GDB, x/10xw Address. Can I use a variable in place of repeat count, i.e can I use a variable in place of 10, like x/($var)xw Address?

This is how my .gdbinit looks like. I need to do some calculations and use the variable ( var3 )

define print_sn_list_hex

            set $var1 = $mcache->elem_size
            set $var2 = $mcache->blocking_factor
             set $var3 = ($var1) * ($var2) / 4
    x/$var3xw $sess # I want to pass a variable here 



   end

end

score 1 · Answer 1 · answered Jun 26 '14 at 21:42

1

Not directly, but you can use the gdb "eval" command to get this effect, or you can write a Python script to do nearly any kind of formatting that you would desire.

answered Jun 26 '14 at 21:42

Tom Tromey

21,507
2
45
63

Can you please show me how i can use `eval` command for the above example. – user3781076 Jun 26 '14 at 22:48
I would try something like (gdb) eval "x/%dxw $sess", $var3 – Tom Tromey Jun 26 '14 at 22:50
Am not able to use eval inside '.gdbinit'. it says eval command not found. What do I do ?please help. – user3781076 Jun 27 '14 at 12:42
Your gdb is probably too old. – Tom Tromey Jul 14 '14 at 01:56

score 0 · Accepted Answer · answered Jun 27 '14 at 20:09

Thank you very much Tom, eval command you mentioned above works perfectly. I was using older version of GDB, so it created problem inititally. its working perfectly fine now. my new code looks like :

define print_sn_list_hex

        set $var1 = $mcache->elem_size
        set $var2 = $mcache->blocking_factor
         set $var3 = ($var1) * ($var2) / 4
         eval "x/%dxw %p",$var3,$sess

Can I use variable in place of repeat count in Examine command GDB, x/10xw Address

2 Answers2