On Fri, Mar 22, 2013 at 9:51 AM, Benoit Jacob <jacob.benoit.1@gmail.com>wrote: > > > 2013/3/22 Rik Cabanier <cabanier@gmail.com> > >> >> >> On Fri, Mar 22, 2013 at 1:48 AM, Robert O'Callahan <robert@ocallahan.org>wrote: >> >>> On Fri, Mar 22, 2013 at 7:48 AM, Rik Cabanier <cabanier@gmail.com>wrote: >>> >>>> On Thu, Mar 21, 2013 at 11:38 AM, Tab Atkins Jr. <jackalmage@gmail.com >>>> > wrote: >>>> >>>>> Only if you actually throw it. It's not eagerly created every call. >>>>> >>>> >>>> I worked a little with the mozilla code base and it seems that they >>>> always create the object. >>>> It's probably not a huge amount of overhead since it's not dynamically >>>> allocated. >>>> >>> >>> We certainly don't create a JS exception object if an exception is not >>> actually thrown. >>> >> >> If a function is marked as throwing in the IDL, doesn't it get an >> exception object as a parameter on the C++ side? >> > > No, in Mozilla's case it gets a so-called ErrorResult object, > > > http://dxr.mozilla.org/mozilla-central/dom/bindings/ErrorResult.h?from=ErrorResult#l34 > > C++ can then decide to call its Throw() method to actually produce an > exception. Yes, that's the one I was thinking of.
Received on Friday, 22 March 2013 16:56:29 UTC