478192 - Add a timed-running thing to the js shell

Status: RESOLVED WONTFIX

(Core :: JavaScript Engine, enhancement)

Description

[Jesse Ruderman]

jsfunfuzz is constrained by the need to avoid generating code that hangs.  It would be sweet if we used the infrastructure behind "timeout()" to give me a way to recover from having generated a function that hangs.

Igor suggests

  timed(generatedFunction, 100)

to run generatedFunction but return to this point (perhaps throwing an exception) if it takes more than 100ms.

This would be especially helpful for testing upvar, because that's all about tangled messes of imperative and functional styles of programming.

Comment 1

[Andreas Gal :gal]

You should be able to do that in the shell already.

timeout(10)
f()

Will stop f after 10s and terminate. If you put some printing logic in the return path of f, you can see whether you got terminated or not.

Comment 2

[Igor Bukanov]

(In reply to comment #1)
> You should be able to do that in the shell already.

Good point. The shell can also use a special exit code to indicate the exit after timeout.

Comment 3

[Igor Bukanov]

With the patch from bug 477850 comment 33 the shell exits with code 6 when execution is canceled due to timeout expiration.