bool
CrossCompartmentWrapper::getPrototypeOf(JSContext *cx, HandleObject wrapper,
MutableHandleObject protop)
{
if (!wrapper->getTaggedProto().isLazy()) {
protop.set(wrapper->getTaggedProto().toObjectOrNull());
return true;
}
{
RootedObject wrapped(cx, wrappedObject(wrapper));
AutoCompartment call(cx, wrapped);
if (!JSObject::getProto(cx, wrapped, protop))
return false;
if (protop)
protop->setDelegate(cx);
}
return cx->compartment->wrap(cx, protop.address());
}
static inline bool
Enumerate(JSContext *cx, HandleObject pobj, jsid id,
bool enumerable, unsigned flags, Maybe<IdSet>& ht, AutoIdVector *props)
{
// We implement __proto__ using a property on |Object.prototype|, but
// because __proto__ is highly deserving of removal, we don't want it to
// show up in property enumeration, even if only for |Object.prototype|
// (think introspection by Prototype-like frameworks that add methods to
// the built-in prototypes). So exclude __proto__ if the object where the
// property was found has no [[Prototype]] and might be |Object.prototype|.
if (MOZ_UNLIKELY(!pobj->getTaggedProto().isObject() && JSID_IS_ATOM(id, cx->names().proto)))
return true;
if (!(flags & JSITER_OWNONLY) || pobj->is<ProxyObject>() || pobj->getOps()->enumerate) {
if (!ht) {
ht.emplace(cx);
// Most of the time there are only a handful of entries.
if (!ht->init(5))
return false;
}
// If we've already seen this, we definitely won't add it.
IdSet::AddPtr p = ht->lookupForAdd(id);
if (MOZ_UNLIKELY(!!p))
return true;
// It's not necessary to add properties to the hash table at the end of
// the prototype chain, but custom enumeration behaviors might return
// duplicated properties, so always add in such cases.
if ((pobj->is<ProxyObject>() || pobj->getProto() || pobj->getOps()->enumerate) && !ht->add(p, id))
return false;
}
// Symbol-keyed properties and nonenumerable properties are skipped unless
// the caller specifically asks for them. A caller can also filter out
// non-symbols by asking for JSITER_SYMBOLSONLY.
if (JSID_IS_SYMBOL(id) ? !(flags & JSITER_SYMBOLS) : (flags & JSITER_SYMBOLSONLY))
return true;
if (!enumerable && !(flags & JSITER_HIDDEN))
return true;
return props->append(id);
}