[Webkit-unassigned] [Bug 154903] Vector<Attribute> in HTMLToken, AtomicHTMLToken, and HTMLStackItem should have inline capacity

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=154903

--- Comment #4 from Ryosuke Niwa <rniwa at webkit.org> ---
(In reply to comment #2)
> Before making this change we should be sure to understand the performance of
> moving a Vector with inline capacity vs. the performance of moving a Vector
> with no inline capacity. We will definitely speed things up by avoiding a
> heap allocation for each Vector when creating it, but we might incur a cost
> when moving the vector between objects.
> 
> If we are copying rather than moving, then I suppose it’s guaranteed to be a
> win.

We're always copying these vectors :(  I'm all ears if you can think of a way to avoid copying.  It's really silly but I haven't quite figured out how to untangle the dependency between lifetimes of these objects yet.

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