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A Debugger Feature I'd Like To See (ceesstuff.github.io)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

26 comments fedilink hide all child comments

Hi, has anybody of you ever seen a feature as described in the post in your environment?

Thank you

Update: As some readers appear to have skimmed the text, please feel free to point out possible accessibility issues, poor choices of words, etc.

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[–] [email protected] 2 points 1 year ago* (last edited 1 year ago) (1 children)

Turns out it exists in gdb, although in a limited scope!

#include <iostream>

int main() {
  int a = 0;
  std::cout << "before: " << a << std::endl;
  a += 1;
  std::cout << "after: " << a << std::endl;
  return 0;
}

Compile with g++ -g and run gdb a.out

(gdb) run
before: 0
after: 1
[Inferior 1 (process 10976) exited normally]
(gdb) break 1
Breakpoint 1 at 0x5555555551d5: file main.cpp, line 6.
(gdb) run
Breakpoint 1, main () at main.cpp:6
6	  int a = 0;
(gdb) jump +3
Continuing at 0x55555555521b.
after: 0
[Inferior 1 (process 10979) exited normally]

See here for documentation

[–] [email protected] 4 points 1 year ago (1 children)

Many debuggers have a set next statement kind type of functionality, but with gdb you can script it so that it performs the jump automatically, like the article suggests:

break 1
commands
jump +3
end

[–] [email protected] 3 points 1 year ago

That's pretty cool. I always wondered why gdb has a scripting interface, now I'm curious what other cool user scripts one can do through it.