[Swfdec] Some updates

zou lunkai zoulunkai at gmail.com
Sat Aug 16 17:52:34 PDT 2008

ABC is different against AS2 from opcode to basic data types(as_value)
and higher level functions.

What about starting a new core for the ABC VM instead of changing the
current AS2 VM too much?  Of cource you can still grab as many things
as you can from the AS2 VM and Tamarin.

Gnash has started the work for ABC support, and there's also a huge
work in the future. From what I can see, many internals have been
reworked, eg. runtime stack, function abstraction and class
abstraction. "reworked" means they don't share the same piece of code
from AS2.

Another thing is that if AS2 and ABC share the same core, it would be
time costing for building and "make check". It might be not a problem
for swfdec though. For Gnash, this process takes at least
half-an-hour, which is very annoying...


On 8/16/08, Benjamin Otte <otte at gnome.org> wrote:
> Hey everybody,
> I've been doing some thinking about the upcoming release while
> enjoying my holidays and playing with ABC support. The ABC support
> will require significant changes to the core that will likely result
> in some instabilities for a while in the core. Seeing that both bug
> reports and commits on master currently are low in volume, I'd vote
> for fixing the few rather annoying bugs we have (the one or two
> crashers in the plugin) and doing an 0.8 as soon as possible. After
> that I'd like to concentrate on getting ABC support ready for 0.10
> next March.
> However, this is a huge task. For comparison: AS2 has roughly 500 (I
> think?) native functions that we need to support. ABC has 1800. While
> we can grab roughly 500 of them from Tamarin, there'll still be twice
> as many left. Add to this that ABC exposes quite a few internals of
> the Flash player that we didn't have to care about before (for example
> DisplayObject and the whole MovieClip object hierarchy), so we'll
> likely need to adapt internals of Swfdec. Nothing huge, but noticable.
> So anybody wanting to follow my development in the next few months -
> or better: help with it! - go and read
> www.adobe.com/devnet/actionscript/articles/avm2overview.pdf now. :)
> Cheers,
> Benjamin
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