Equivalent of Visual Studio's Watch Window in GUD

Question

I am using Emacs 23 to do some C development, with GUD (using GDB) as my debugger.

I have looked online, but haven't yet found an equivalent to Visual Studio's Watch Window in GUD. Essentially, this window lets you insert a list of expressions, which are evaluated each time the program is stepped, and shows you their value. Is there a similar feature to this in GUD?

I have seen that GDB has a feature called watch points, but that is not what I'm looking for.

Answer 1

Probably not a complete answer to what you want, but this might help wrt the Lisp debugger: Use e to evaluate a Lisp sexp that you enter. This can be as complex as you like. In particular, it can be a sexp that uses, say, pp-eval-expression to show, in another window, a complex return value from evaluating a sexp. Naturally, you can have a single sexp evaluate multiple sexps.

Having done this once, just use e with M-p to repeat it anytime during debugging, to get the updated evaluations of the sexps. You can also select the sexp as the secondary selection, and they use M-mouse-2 to retrieve it for e at any time.