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re-apply "Improve nsHtml5AtomTable performance (#693)" (#695)"

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This reverts commit ca87455cc5880897c8b921077819988feede90bd.
This commit is contained in:
wolfbeast 2018-08-04 13:40:36 +02:00 • committed by Roy Tam
commit 860f212b0b
2 changed files with 20 additions and 0 deletions
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14
parser/html/nsHtml5AtomTable.cpp
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@ -31,7 +31,11 @@ nsHtml5AtomTable::nsHtml5AtomTable()
}
nsHtml5AtomTable::~nsHtml5AtomTable()
: mRecentlyUsedParserAtoms{}
{
#ifdef DEBUG
NS_GetMainThread(getter_AddRefs(mPermittedLookupThread));
#endif
}
nsIAtom*
@ -44,13 +48,23 @@ nsHtml5AtomTable::GetAtom(const nsAString& aKey)
NS_ASSERTION(mPermittedLookupThread == currentThread, "Wrong thread!");
}
#endif
uint32_t index = mozilla::HashString(aKey) % RECENTLY_USED_PARSER_ATOMS_SIZE;
nsIAtom* cachedAtom = mRecentlyUsedParserAtoms[index];
if (cachedAtom && cachedAtom->Equals(aKey)) {
return cachedAtom;
}
nsIAtom* atom = NS_GetStaticAtom(aKey);
if (atom) {
mRecentlyUsedParserAtoms[index] = atom;
return atom;
}
nsHtml5AtomEntry* entry = mTable.PutEntry(aKey);
if (!entry) {
return nullptr;
}
mRecentlyUsedParserAtoms[index] = entry->GetAtom();
return entry->GetAtom();
}