I want to execute the very simple command
print var1, var2, var3, var4
in gdb to examine the values of the vars from time to time.
I don't want to use display because it clutters up my view.
How can I do this? Right now all I can do is:
p var1
p var2
p var3
p var4
You can simply do this
print {var1,var2,var3,var4}
This will do the job.
array elements must all be the same size.
Use the printf command. It's a bit of a hassle, but it gives good control over the formatting. From the command line:
(gdb) help printf
printf "printf format string", arg1, arg2, arg3, ..., argn
This is useful for formatted output in user-defined commands.
The format string is like in C (%d for normal size ints, %s for null terminated strings, etc.).
That operation is not available on integers of more than 8 bytes. (GCC on AMD64 has emulated __int128_t on some platforms.) Of course, you can shift and cast.Use Macros:
For example to continue to next break point and print
(gdb) define prm
Type commands for definition of prm.
End with a line saying just end.
>continue
>print var1
>print var2
>print var3
>end
(gdb) prm
$5 = 0
$6 = 10
$7 = -1
There may be a simpler solution, but you might be able to put together something using GDB macros: http://www.ibm.com/developerworks/aix/library/au-gdb.html
Use printf with the %V format specifier.
printf "%V\n%V\n%V\n", var1, var2, var3
See https://sourceware.org/gdb/current/onlinedocs/gdb.html/Output.html#g_t_0025V-Format-Specifier
Additionally, printf supports a special ‘%V’ output format. This format prints the string representation of an expression just as GDB would produce with the standard print command (see Examining Data):
(gdb) print array
$1 = {0, 1, 2, 3, 4, 5}
(gdb) printf "Array is: %V\n", array
Array is: {0, 1, 2, 3, 4, 5}
