lightspark-users team mailing list archive

["Jasper St. Pierre" <jstpierre@xxxxxxxxxxx>]

On Wed, Oct 5, 2011 at 8:03 AM, Matthias Gehre <M.Gehre@xxxxxx> wrote:
> Hi,
>
> so each script init is run with a distinct (global) object as 'this'.

Yes. You can verify this by using "getglobalscope" across two scripts
and comparing the pointers in Tamarin.

> 1. How do we resolve names which are defined in multiple global objects?
> GlobalObject::getVariableAndTargetByMultiname searches through all
> until it finds the first one, but
> there is no well defined order.

"The first one wins" or "Throw a verifier error in case two scripts
have the same exports". It's one of the two.

> 2. The spec says that if I use Function.call and pass 'null' as the
> first parameter,
> then _the_ global object should be used as 'this' of the called function.
> But which one?
> Not all function calls originate from some script init, so I don't see
> a good way
> to determine the global object that we should use.
> See for example testcase tamarin-SWF/ecma3/Function/e15_3_4_4_1_rt_.swf

The callee's global object. So, the same as "getglobalscope" inside
the function call.

> Unfortunatelly none of our testcases generate an DoABC tag with
> multiple scripts,
> and I don't know how to write one. I only encountered them with YT.

For Flex, each class that you write will be in one DoABC tag.

> Matthias
>
> 2011/10/4 Alessandro Pignotti <a.pignotti@xxxxxxxx>:
>> Hi,
>>
>> it's needed to have multiple global objects as each script expects to
>> work on a clean context. For example each script may use initSlot.
>>
>> Alessandro
>>
>> Il giorno mar, 04/10/2011 alle 11.25 +0200, Matthias Gehre ha scritto:
>>> Hey,
>>>
>>> while looking through the code, I saw that in ABCContext::exec
>>> we create a global object for each script by
>>> global=Class<ASObject>::getInstanceS();
>>> and then do
>>> getGlobal()->registerGlobalScope(global);
>>> which adds the 'global' to the globalScopes member of GlobalObject.
>>>
>>> Why do we have multiple global scopes? It seems that
>>> GlobalObject::getVariableAndTargetByMultiname searches through all
>>> global objects,
>>> so it should be the same if we have just one instead of multiple?
>>>
>>> Then, I would derive GlobalObject from ASObject, as toString() on the
>>> global object should return "[object Global]".
>>> (we return [object Object] currently).
>>>
>>> Cheers,
>>> Matthias
>>>
>>
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-- 
  Jasper