bool
js::GetProperty(JSContext *cx, Handle<ObjectImpl*> obj, Handle<ObjectImpl*> receiver,
Handle<PropertyId> pid, unsigned resolveFlags, MutableHandle<Value> vp)
{
NEW_OBJECT_REPRESENTATION_ONLY();
MOZ_ASSERT(receiver);
Rooted<ObjectImpl*> current(cx, obj);
do {
MOZ_ASSERT(obj);
if (Downcast(current)->isProxy()) {
MOZ_NOT_REACHED("NYI: proxy [[GetP]]");
return false;
}
PropDesc desc;
PropDesc::AutoRooter rootDesc(cx, &desc);
if (!GetOwnProperty(cx, current, pid, resolveFlags, &desc))
return false;
/* No property? Recur or bottom out. */
if (desc.isUndefined()) {
current = current->getProto();
if (current)
continue;
vp.setUndefined();
return true;
}
/* If it's a data property, return the value. */
if (desc.isDataDescriptor()) {
vp.set(desc.value());
return true;
}
/* If it's an accessor property, call its [[Get]] with the receiver. */
if (desc.isAccessorDescriptor()) {
Rooted<Value> get(cx, desc.getterValue());
if (get.isUndefined()) {
vp.setUndefined();
return true;
}
InvokeArgsGuard args;
if (!cx->stack.pushInvokeArgs(cx, 0, &args))
return false;
args.setCallee(get);
args.setThis(ObjectValue(*receiver));
bool ok = Invoke(cx, args);
vp.set(args.rval());
return ok;
}
/* Otherwise it's a PropertyOp-based property. XXX handle this! */
MOZ_NOT_REACHED("NYI: handle PropertyOp'd properties here");
return false;
} while (false);
MOZ_NOT_REACHED("buggy control flow");
return false;
}
