gdb: logging something instead of breaking?

Question

Is it possible to have gdb log something to the terminal instead of breaking on it? For example I would like to set a 'breakpoint' on some method and have gdb print self as well as the parameters each time the method is invoked. Basically I want to insert print statements into arbitrary places without actually recompiling.

thanks for any suggestions

---

This is what i have so far after these helpful comments:

define logFoo
b fooMethod
commands
po self
end
end

GDB doesn't seem to like the nested end statements though. any thoughts?

Answer 1

You can use Breakpoint Command Lists. There is an example how to do it.

For example, here is how you could use breakpoint commands to print the value of x at entry to foo whenever x is positive.

 break foo if x>0
 commands
 silent
 printf "x is %d\n",x
 cont
 end