示例#1
0
bool
ForOfIterator::next(MutableHandleValue vp, bool* done)
{
    MOZ_ASSERT(iterator);

    if (index != NOT_ARRAY) {
        ForOfPIC::Chain* stubChain = ForOfPIC::getOrCreate(cx_);
        if (!stubChain)
            return false;

        if (stubChain->isArrayNextStillSane())
            return nextFromOptimizedArray(vp, done);

        // ArrayIterator.prototype.next changed, materialize a proper
        // ArrayIterator instance and fall through to slowpath case.
        if (!materializeArrayIterator())
            return false;
    }

    RootedValue method(cx_);
    if (!GetProperty(cx_, iterator, iterator, cx_->names().next, &method))
        return false;

    InvokeArgs args(cx_);
    if (!args.init(1))
        return false;
    args.setCallee(method);
    args.setThis(ObjectValue(*iterator));
    args[0].setUndefined();
    if (!Invoke(cx_, args))
        return false;

    RootedObject resultObj(cx_, ToObject(cx_, args.rval()));
    if (!resultObj)
        return false;
    RootedValue doneVal(cx_);
    if (!GetProperty(cx_, resultObj, resultObj, cx_->names().done, &doneVal))
        return false;
    *done = ToBoolean(doneVal);
    if (*done) {
        vp.setUndefined();
        return true;
    }
    return GetProperty(cx_, resultObj, resultObj, cx_->names().value, vp);
}
bool
ForOfIterator::next(MutableHandleValue vp, bool* done)
{
    MOZ_ASSERT(iterator);
    if (index != NOT_ARRAY) {
        ForOfPIC::Chain* stubChain = ForOfPIC::getOrCreate(cx_);
        if (!stubChain)
            return false;

        if (stubChain->isArrayNextStillSane())
            return nextFromOptimizedArray(vp, done);

        // ArrayIterator.prototype.next changed, materialize a proper
        // ArrayIterator instance and fall through to slowpath case.
        if (!materializeArrayIterator())
            return false;
    }

    RootedValue v(cx_);
    if (!GetProperty(cx_, iterator, iterator, cx_->names().next, &v))
        return false;

    if (!js::Call(cx_, v, iterator, &v))
        return false;

    if (!v.isObject())
        return ThrowCheckIsObject(cx_, CheckIsObjectKind::IteratorNext);

    RootedObject resultObj(cx_, &v.toObject());
    if (!GetProperty(cx_, resultObj, resultObj, cx_->names().done, &v))
        return false;

    *done = ToBoolean(v);
    if (*done) {
        vp.setUndefined();
        return true;
    }

    return GetProperty(cx_, resultObj, resultObj, cx_->names().value, vp);
}