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Bug 792385 - Try to skip nsJSEventListener in CC, r=mccr8

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This commit is contained in:
Olli Pettay 2012-09-24 23:25:35 +03:00
parent a0648b9ee4
commit 91520a7f56
1 changed files with 16 additions and 1 deletions
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15
dom/src/events/nsJSEventListener.cpp
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@ -90,7 +90,22 @@ NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsJSEventListener)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(nsJSEventListener)
if (tmp->IsBlackForCC()) {
return true;
}
// If we have a target, it is the one which has tmp as onfoo handler.
if (tmp->mTarget) {
nsXPCOMCycleCollectionParticipant* cp = nullptr;
CallQueryInterface(tmp->mTarget, &cp);
nsISupports* canonical = nullptr;
tmp->mTarget->QueryInterface(NS_GET_IID(nsCycleCollectionISupports),
reinterpret_cast<void**>(&canonical));
// Usually CanSkip ends up unmarking the event listeners of mTarget,
// so tmp may become black.
if (cp && canonical && cp->CanSkip(canonical, true)) {
return tmp->IsBlackForCC();
}
}
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(nsJSEventListener)