/* static */ bool
MovableCellHasher<T>::match(const Key& k, const Lookup& l)
{
// Return true if both are null or false if only one is null.
if (!k)
return !l;
if (!l)
return false;
MOZ_ASSERT(k);
MOZ_ASSERT(l);
MOZ_ASSERT(CurrentThreadCanAccessZone(l->zoneFromAnyThread()) ||
l->zoneFromAnyThread()->isSelfHostingZone());
Zone* zone = k->zoneFromAnyThread();
if (zone != l->zoneFromAnyThread())
return false;
MOZ_ASSERT(zone->hasUniqueId(k));
MOZ_ASSERT(zone->hasUniqueId(l));
// Since both already have a uid (from hash), the get is infallible.
uint64_t uidK, uidL;
MOZ_ALWAYS_TRUE(zone->getUniqueId(k, &uidK));
MOZ_ALWAYS_TRUE(zone->getUniqueId(l, &uidL));
return uidK == uidL;
}
/* static */ HashNumber
MovableCellHasher<T>::hash(const Lookup& l)
{
if (!l)
return 0;
// We have to access the zone from-any-thread here: a worker thread may be
// cloning a self-hosted object from the main-thread-runtime-owned self-
// hosting zone into the off-main-thread runtime. The zone's uid lock will
// protect against multiple workers doing this simultaneously.
MOZ_ASSERT(CurrentThreadCanAccessZone(l->zoneFromAnyThread()) ||
l->zoneFromAnyThread()->isSelfHostingZone());
return l->zoneFromAnyThread()->getHashCodeInfallible(l);
}
/* static */ bool
MovableCellHasher<T>::hasHash(const Lookup& l)
{
if (!l)
return true;
return l->zoneFromAnyThread()->hasUniqueId(l);
}
/* static */ bool
MovableCellHasher<T>::ensureHash(const Lookup& l)
{
if (!l)
return true;
uint64_t unusedId;
return l->zoneFromAnyThread()->getUniqueId(l, &unusedId);
}
/* static */ HashNumber
MovableCellHasher<T>::hash(const Lookup& l)
{
if (!l)
return 0;
// We have to access the zone from-any-thread here: a worker thread may be
// cloning a self-hosted object from the main-thread-runtime-owned self-
// hosting zone into the off-main-thread runtime. The zone's uid lock will
// protect against multiple workers doing this simultaneously.
MOZ_ASSERT(CurrentThreadCanAccessZone(l->zoneFromAnyThread()) ||
l->zoneFromAnyThread()->isSelfHostingZone());
HashNumber hn;
AutoEnterOOMUnsafeRegion oomUnsafe;
if (!l->zoneFromAnyThread()->getHashCode(l, &hn))
oomUnsafe.crash("failed to get a stable hash code");
return hn;
}
/* static */ bool
MovableCellHasher<T>::match(const Key& k, const Lookup& l)
{
// Return true if both are null or false if only one is null.
if (!k)
return !l;
if (!l)
return false;
MOZ_ASSERT(k);
MOZ_ASSERT(l);
MOZ_ASSERT(CurrentThreadCanAccessZone(l->zoneFromAnyThread()) ||
l->zoneFromAnyThread()->isSelfHostingZone());
Zone* zone = k->zoneFromAnyThread();
if (zone != l->zoneFromAnyThread())
return false;
#ifdef DEBUG
// Incremental table sweeping means that existing table entries may no
// longer have unique IDs. We fail the match in that case and the entry is
// removed from the table later on.
if (!zone->hasUniqueId(k)) {
Key key = k;
MOZ_ASSERT(IsAboutToBeFinalizedUnbarriered(&key));
}
MOZ_ASSERT(zone->hasUniqueId(l));
#endif
uint64_t keyId;
if (!zone->maybeGetUniqueId(k, &keyId)) {
// Key is dead and cannot match lookup which must be live.
return false;
}
return keyId == zone->getUniqueIdInfallible(l);
}