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Bug 1406922 - Make CycleCollectedJSContext to handle microtasks and make MutationObserver to use them

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Tag UXP Issue #1344
This commit is contained in:
Gaming4JC 2020-01-22 21:07:19 -05:00 • committed by Roy Tam
commit 249667092c
5 changed files with 164 additions and 48 deletions
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67
dom/base/nsDOMMutationObserver.cpp
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@ -32,8 +32,6 @@ using mozilla::dom::Element;
AutoTArray<RefPtr<nsDOMMutationObserver>, 4>*
nsDOMMutationObserver::sScheduledMutationObservers = nullptr;
nsDOMMutationObserver* nsDOMMutationObserver::sCurrentObserver = nullptr;
uint32_t nsDOMMutationObserver::sMutationLevel = 0;
uint64_t nsDOMMutationObserver::sCount = 0;
@ -597,10 +595,32 @@ nsDOMMutationObserver::ScheduleForRun()
RescheduleForRun();
}
class MutationObserverMicroTask final : public MicroTaskRunnable
{
public:
virtual void Run(AutoSlowOperation& aAso) override
{
nsDOMMutationObserver::HandleMutations(aAso);
}
virtual bool Suppressed() override
{
return nsDOMMutationObserver::AllScheduledMutationObserversAreSuppressed();
}
};
void
nsDOMMutationObserver::RescheduleForRun()
{
if (!sScheduledMutationObservers) {
CycleCollectedJSContext* ccjs = CycleCollectedJSContext::Get();
if (!ccjs) {
return;
}
RefPtr<MutationObserverMicroTask> momt =
new MutationObserverMicroTask();
ccjs->DispatchMicroTaskRunnable(momt.forget());
sScheduledMutationObservers = new AutoTArray<RefPtr<nsDOMMutationObserver>, 4>;
}
@ -862,36 +882,9 @@ nsDOMMutationObserver::HandleMutation()
mCallback->Call(this, mutations, *this);
}
class AsyncMutationHandler : public mozilla::Runnable
{
public:
NS_IMETHOD Run() override
{
nsDOMMutationObserver::HandleMutations();
return NS_OK;
}
};
void
nsDOMMutationObserver::HandleMutationsInternal()
nsDOMMutationObserver::HandleMutationsInternal(AutoSlowOperation& aAso)
{
if (!nsContentUtils::IsSafeToRunScript()) {
nsContentUtils::AddScriptRunner(new AsyncMutationHandler());
return;
}
static RefPtr<nsDOMMutationObserver> sCurrentObserver;
if (sCurrentObserver && !sCurrentObserver->Suppressed()) {
// In normal cases sScheduledMutationObservers will be handled
// after previous mutations are handled. But in case some
// callback calls a sync API, which spins the eventloop, we need to still
// process other mutations happening during that sync call.
// This does *not* catch all cases, but should work for stuff running
// in separate tabs.
return;
}
mozilla::AutoSlowOperation aso;
nsTArray<RefPtr<nsDOMMutationObserver> >* suppressedObservers = nullptr;
while (sScheduledMutationObservers) {
@ -899,20 +892,21 @@ nsDOMMutationObserver::HandleMutationsInternal()
sScheduledMutationObservers;
sScheduledMutationObservers = nullptr;
for (uint32_t i = 0; i < observers->Length(); ++i) {
sCurrentObserver = static_cast<nsDOMMutationObserver*>((*observers)[i]);
if (!sCurrentObserver->Suppressed()) {
sCurrentObserver->HandleMutation();
RefPtr<nsDOMMutationObserver> currentObserver =
static_cast<nsDOMMutationObserver*>((*observers)[i]);
if (!currentObserver->Suppressed()) {
currentObserver->HandleMutation();
} else {
if (!suppressedObservers) {
suppressedObservers = new nsTArray<RefPtr<nsDOMMutationObserver> >;
}
if (!suppressedObservers->Contains(sCurrentObserver)) {
suppressedObservers->AppendElement(sCurrentObserver);
if (!suppressedObservers->Contains(currentObserver)) {
suppressedObservers->AppendElement(currentObserver);
}
}
}
delete observers;
aso.CheckForInterrupt();
aAso.CheckForInterrupt();
}
if (suppressedObservers) {
@ -923,7 +917,6 @@ nsDOMMutationObserver::HandleMutationsInternal()
delete suppressedObservers;
suppressedObservers = nullptr;
}
sCurrentObserver = nullptr;
}
nsDOMMutationRecord*