RESOLVED FIXED Bug 69406
IsShadowRootFlag should not depend on whether the ShadowRoot is attached to a host 
https://bugs.webkit.org/show_bug.cgi?id=69406
Summary IsShadowRootFlag should not depend on whether the ShadowRoot is attached to a...
Dominic Cooney
Reported 2011-10-05 00:58:45 PDT
To improve performance I am proposing we use IsShadowRootFlag and isSVGShadowRoot virtual slightly differently: getFlag(IsShadowRootFlag) => ShadowRoot or SVGShadowRoot getFlag(IsShadowRootFlag) && !getFlag(IsSVGElementFlag) => ShadowRoot (ie new style) getFlag(IsShadowRootFlag) && getFlag(IsSVGElementFlag) => SVGShadowRoot This will fix a performance regression in parentNode (see bug 69266) and remove a virtual from Node (isSVGShadowRoot can just consult flags.) One way isSVGShadowRoot and getFlag(IsShadowRootFlag) vary today is that isSVGShadowRoot is associated with the SVGShadowRoot type the vtable; it never changes for a given instance. But ShadowRoot sets and clears getFlag(IsShadowRootFlag) when a ShadowRoot is attached/detached to a host. I think this is needless variation. I think we should always set IsShadowRootFlag for ShadowRoot instances. If the caller wants to find out whether it is associated with a host, it can test null-ness of shadowHost().
Attachments
Patch (3.82 KB, patch)
2011-10-05 01:16 PDT, Dominic Cooney 		no flags
DetailsFormatted DiffDiff
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Dominic Cooney
Comment 1 2011-10-05 01:16:03 PDT
Created attachment 109757 [details] Patch
Hajime Morrita
Comment 2 2011-10-05 18:46:20 PDT
Comment on attachment 109757 [details] Patch Looks sane.
WebKit Review Bot
Comment 3 2011-10-05 19:26:41 PDT
Comment on attachment 109757 [details] Patch Clearing flags on attachment: 109757 Committed r96782: <http://trac.webkit.org/changeset/96782>
WebKit Review Bot
Comment 4 2011-10-05 19:26:45 PDT
All reviewed patches have been landed. Closing bug.
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