emacs gdb跳转到游标

Question

I have just discovered Cx Ca Cj (jump to cursor) when running gdb in emacs. I initially assumed that it was the equivalent of setting a break wherever the cursor is and continuing ( c ) to that statement. However I seem to be observing the behaviour that when using jump none of the intervening statements (between the prev breakpoint and the current cursor location) are being executed. Can anyone confirm or deny this?

I guess if it isn't executing the statements it is equivalent to being able to comment out a block of code 'from within' the debugger, ie without having to go back into the src, explicitly comment out and then recompile. I can see that could be useful, but it definitely wasn't what I was expecting.

If that is what's happening then a follow up question would be is there a 'continue to cursor' command (where the intervening statements do get executed)?

Answer 1

I believe what you need is Cx Ca Cu ( Mx gud-until ) instead of Mx gud-jump . The latter, as the Emacs manual quite clearly states, simply

transfers the program's execution point to the current line. In other words, the next line that the program executes will be the one where you gave the command [...] See the GDB manual entry regarding jump for details.