tree ada597c91f3267fac6178561092a54fb9de962a4
parent 23fa443002634121c4f338bbaaee6d773dc17b0b
author ysuzuki@apple.com <ysuzuki@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1579246329 +0000
committer ysuzuki@apple.com <ysuzuki@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1579246329 +0000

Compact sizeof(HTMLAnchorElement) and sizeof(HTMLLinkElement)
https://bugs.webkit.org/show_bug.cgi?id=206343

Reviewed by Ryosuke Niwa.

Data from Membuster is saying that HTMLAnchorElement is relatively frequently allocated
element (1252 elements are kept) while sizeof(HTMLAnchorElement) is not optimized well.
We also found that HTMLLinkElement is too large while it has so many paddings and opportunities
to optimize it. This patch shrinks them.

We also found that SharedStringHashHash's upper 32bit is always zero, and nobody is using this
effectively. We make it 32bit.

No behavior change.

* html/HTMLAnchorElement.h:
* html/HTMLLinkElement.cpp:
(WebCore::HTMLLinkElement::HTMLLinkElement):
(WebCore::HTMLLinkElement::process):
* html/HTMLLinkElement.h:
* html/LinkIconCollector.h:
* html/LinkIconType.h:
* html/LinkRelAttribute.cpp:
(WebCore::LinkRelAttribute::LinkRelAttribute):
* html/LinkRelAttribute.h:
(): Deleted.
* page/Page.h:
* page/VisitedLinkStore.h:
* platform/SharedStringHash.h:
(WebCore::SharedStringHashHash::avoidDeletedValue): Deleted.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@254739 268f45cc-cd09-0410-ab3c-d52691b4dbfc