COMEFROM control flow

Question

According to wikipedia COMEFROM flow control is considered a joke, unreadable or downright harmful. I'd imagine such a feature would be very useful in AOP scenarios (ie. adding logger to methods without adding logger calls to methods).

Does the downside of non-obviousness of such a control structure outweigh the potential usefulness? Are there any other downsides to consider?

Prompted to ask this question because of this.

Answer 1

For starters is basically useless in any modern language because you need to either:

• Reference the position to jump from by line number, and these are volatile.
• Place a marker or label in the code to denote a position that can be jumped from, thus destroying any possible benefits of not needing to do this.

Also:

• Makes any kind of debugging by inspection essentially useless.
• Can't really capture any context from where it jumped unless you keep variables persistant, which is asking for trouble.

A much better idea would be to instead:

• Write a hooking API.
• Call a function!