ArgumentsObject*
ArgumentsObject::createTemplateObject(JSContext* cx, bool mapped)
{
const Class* clasp = mapped
? &MappedArgumentsObject::class_
: &UnmappedArgumentsObject::class_;
RootedObject proto(cx, cx->global()->getOrCreateObjectPrototype(cx));
if (!proto)
return nullptr;
RootedObjectGroup group(cx, ObjectGroup::defaultNewGroup(cx, clasp, TaggedProto(proto.get())));
if (!group)
return nullptr;
RootedShape shape(cx, EmptyShape::getInitialShape(cx, clasp, TaggedProto(proto),
FINALIZE_KIND, BaseShape::INDEXED));
if (!shape)
return nullptr;
AutoSetNewObjectMetadata metadata(cx);
JSObject* base = JSObject::create(cx, FINALIZE_KIND, gc::TenuredHeap, shape, group);
if (!base)
return nullptr;
ArgumentsObject* obj = &base->as<js::ArgumentsObject>();
obj->initFixedSlot(ArgumentsObject::DATA_SLOT, PrivateValue(nullptr));
return obj;
}
/* static */ size_t
ArgumentsObject::objectMovedDuringMinorGC(JSTracer* trc, JSObject* dst, JSObject* src)
{
ArgumentsObject* ndst = &dst->as<ArgumentsObject>();
ArgumentsObject* nsrc = &src->as<ArgumentsObject>();
MOZ_ASSERT(ndst->data() == nsrc->data());
Nursery& nursery = trc->runtime()->gc.nursery;
if (!nursery.isInside(nsrc->data())) {
nursery.removeMallocedBuffer(nsrc->data());
return 0;
}
AutoEnterOOMUnsafeRegion oomUnsafe;
uint32_t nbytes = nsrc->data()->dataBytes;
uint8_t* data = nsrc->zone()->pod_malloc<uint8_t>(nbytes);
if (!data)
oomUnsafe.crash("Failed to allocate ArgumentsObject data while tenuring.");
ndst->initFixedSlot(DATA_SLOT, PrivateValue(data));
mozilla::PodCopy(data, reinterpret_cast<uint8_t*>(nsrc->data()), nbytes);
ArgumentsData* dstData = ndst->data();
dstData->deletedBits = reinterpret_cast<size_t*>(dstData->args + dstData->numArgs);
return nbytes;
}
/* static */ size_t
ArgumentsObject::objectMoved(JSObject* dst, JSObject* src)
{
ArgumentsObject* ndst = &dst->as<ArgumentsObject>();
const ArgumentsObject* nsrc = &src->as<ArgumentsObject>();
MOZ_ASSERT(ndst->data() == nsrc->data());
if (!IsInsideNursery(src))
return 0;
Nursery& nursery = dst->zone()->group()->nursery();
size_t nbytesTotal = 0;
if (!nursery.isInside(nsrc->data())) {
nursery.removeMallocedBuffer(nsrc->data());
} else {
AutoEnterOOMUnsafeRegion oomUnsafe;
uint32_t nbytes = ArgumentsData::bytesRequired(nsrc->data()->numArgs);
uint8_t* data = nsrc->zone()->pod_malloc<uint8_t>(nbytes);
if (!data)
oomUnsafe.crash("Failed to allocate ArgumentsObject data while tenuring.");
ndst->initFixedSlot(DATA_SLOT, PrivateValue(data));
mozilla::PodCopy(data, reinterpret_cast<uint8_t*>(nsrc->data()), nbytes);
nbytesTotal += nbytes;
}
if (RareArgumentsData* srcRareData = nsrc->maybeRareData()) {
if (!nursery.isInside(srcRareData)) {
nursery.removeMallocedBuffer(srcRareData);
} else {
AutoEnterOOMUnsafeRegion oomUnsafe;
uint32_t nbytes = RareArgumentsData::bytesRequired(nsrc->initialLength());
uint8_t* dstRareData = nsrc->zone()->pod_malloc<uint8_t>(nbytes);
if (!dstRareData)
oomUnsafe.crash("Failed to allocate RareArgumentsData data while tenuring.");
ndst->data()->rareData = (RareArgumentsData*)dstRareData;
mozilla::PodCopy(dstRareData, reinterpret_cast<uint8_t*>(srcRareData), nbytes);
nbytesTotal += nbytes;
}
}
return nbytesTotal;
}