Of course listening to the event is implemented in Blink, but it uses V8 APIs in order to break at uncaught exceptions, so I wondered if activating this makes the execution less performant.
☆*PhistucK* On Fri, May 27, 2016 at 6:19 PM, Yang Guo <[email protected]> wrote: > That doesnt sound like something in V8. The onerror listener is > implemented by blink. > > Yang > > On Tue, May 24, 2016, 12:55 PhistucK <[email protected]> wrote: > >> Not throwing errors, but whether adding an event listener to the "error" >> influences performance without even throwing errors. I just do not know... >> >> >> ☆*PhistucK* >> >> On Tue, May 24, 2016 at 1:46 PM, Yang Guo <[email protected]> wrote: >> >>> Throwing errors typically are not and should not be on the critical path >>> of any Javascript program. Therefore it makes no sense to add complexity to >>> make this faster. >>> >>> Cheers, >>> >>> Yang >>> >>> >>> On Thursday, May 19, 2016 at 8:03:55 PM UTC+2, PhistucK wrote: >>>> >>>> I am not really sure about how to test it, but I guess you know more >>>> about it. >>>> >>>> Browsers support the "error" (window.onerror or >>>> window.addEventListener("error", ...)) event, which, if you call >>>> e.preventDefault() and the like, apparently catches the exception (I could >>>> not get it to work for some reason when I tried in the console, though). >>>> >>>> I was thinking about the potential performance gains of adding >>>> {passive: true} support for this event - can it simplify some checks and >>>> yield (even) better performance when using the event? Will the V8 engine >>>> benefit from that in some way (for example, fire it not immediately if it >>>> knows there is more code to run at the moment, or something similar, >>>> batching and so on)? >>>> >>>> Again, I do not know whether there is even any performance implication >>>> to adding an "error" event listener, you probably know more. >>>> >>>> Just an idea. >>>> >>>> >>>> >>>> ☆*PhistucK* >>>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "blink-dev" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> >> >> -- -- v8-users mailing list [email protected] http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
