[V8] Optimize v8StringOrNull() and v8StringOrUndefined()

[Kentaro Hara]

Currently v8StringOrNull() and v8StringOrUndefined() are checking a null string twice. It is redundant.

[Kentaro Hara]

Created attachment 177921 [details]
Patch

[Adam Barth]

Comment on attachment 177921 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=177921&action=review

> Source/WebCore/bindings/v8/V8Binding.h:161
> +        if (UNLIKELY(!isolate))
> +            isolate = v8::Isolate::GetCurrent();

Some day we'll make isolate mandatory and remove all these branches.

[Kentaro Hara]

(In reply to comment #2)
> (From update of attachment 177921 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=177921&action=review
> 
> > Source/WebCore/bindings/v8/V8Binding.h:161
> > +        if (UNLIKELY(!isolate))
> > +            isolate = v8::Isolate::GetCurrent();
> 
> Some day we'll make isolate mandatory and remove all these branches.

I'm doing it today:)

Actually all call sites of v8StringOrNull() and v8StringOrUndefined() have an isolate. Almost all call sites of v8String() have an isolate. (I'll add v8StringWithCheck(), which has an isolate check, and will use it for call sites that don't have an isolate.)

[Kentaro Hara]

Also I've implemented an isolate-version V8 APIs for Local<T>::New() and IsWeak(), which will land this week or next week. It will speed up v8String() and others.

[WebKit Review Bot]

Comment on attachment 177921 [details]
Patch

Clearing flags on attachment: 177921

Committed r136797: <http://trac.webkit.org/changeset/136797>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.