/* compute the logarithm of the KT-estimator update multiplier */
double CTNode::logKTMul(bit_t b) const {
static const double alpha = 0.5;
static const double alpha2 = 2.0 * alpha;
double kt_mul_numer = double(m_count[b]) + alpha;
double kt_mul_denom = double(visits()) + alpha2;
return std::log(kt_mul_numer / kt_mul_denom);
}
NS_IMETHODIMP
PlaceInfo::GetVisits(JSContext* aContext,
JS::Value* _visits)
{
// If the visits data was not provided, return null rather
// than an empty array to distinguish this case from the case
// of a place without any visit.
if (!mVisitsAvailable) {
*_visits = JSVAL_NULL;
return NS_OK;
}
// TODO bug 625913 when we use this in situations that have more than one
// visit here, we will likely want to make this cache the value.
JS::Rooted<JSObject*> visits(aContext,
JS_NewArrayObject(aContext, 0, nullptr));
NS_ENSURE_TRUE(visits, NS_ERROR_OUT_OF_MEMORY);
JS::Rooted<JSObject*> global(aContext, JS::CurrentGlobalOrNull(aContext));
NS_ENSURE_TRUE(global, NS_ERROR_UNEXPECTED);
nsCOMPtr<nsIXPConnect> xpc = mozilla::services::GetXPConnect();
for (VisitsArray::size_type idx = 0; idx < mVisits.Length(); idx++) {
nsCOMPtr<nsIXPConnectJSObjectHolder> wrapper;
nsresult rv = xpc->WrapNative(aContext, global, mVisits[idx],
NS_GET_IID(mozIVisitInfo),
getter_AddRefs(wrapper));
NS_ENSURE_SUCCESS(rv, rv);
JS::Rooted<JSObject*> jsobj(aContext, wrapper->GetJSObject());
NS_ENSURE_STATE(jsobj);
JS::Rooted<JS::Value> wrappedVisit(aContext, OBJECT_TO_JSVAL(jsobj));
bool rc = JS_SetElement(aContext, visits, idx, &wrappedVisit);
NS_ENSURE_TRUE(rc, NS_ERROR_UNEXPECTED);
}
*_visits = OBJECT_TO_JSVAL(visits);
return NS_OK;
}