[webkit-dev] [JavaScriptCore] When to JSValueProtect?

[Oliver Hunt]

On Dec 7, 2013, at 12:15 PM, Alexei Sholik <alcosholik at gmail.com> wrote:

> The garbage collector scans the C stack.
> 
> Hm, let me make sure I understand this correctly.
> ...
> I'm asking because I've never previously dealt with a library that scans the host application's stack. So it sounds pretty incredible to me.

Every JSC vm will do a full conservative scan of the in use portion of the stack for every thread in your application whenever it needs to GC.  Anything that looks like it could be a pointer to a gc value is treated as though it is _definitely_ a GC value and marked accordingly.

> 
> Thanks!
>    
> 
> 
> On Sat, Dec 7, 2013 at 9:37 PM, Geoffrey Garen <ggaren at apple.com> wrote:
> > At this point, the code is not inside the JS stack, so is it possible for an object to be collected between the calls to JSObjectMake and JSObjectCallAsFunction?
> 
> The garbage collector scans the C stack.
> 
> Geoff
> 
> 
> 
> -- 
> Best regards
> Alexei Sholik
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