QV4::ReturnedValue QQmlJavaScriptExpression::evaluate(QQmlContextData *context,
const QV4::ValueRef function,
QV4::CallData *callData,
bool *isUndefined)
{
Q_ASSERT(context && context->engine);
if (function->isUndefined()) {
if (isUndefined)
*isUndefined = true;
return QV4::Encode::undefined();
}
QQmlEnginePrivate *ep = QQmlEnginePrivate::get(context->engine);
// All code that follows must check with watcher before it accesses data members
// incase we have been deleted.
DeleteWatcher watcher(this);
Q_ASSERT(notifyOnValueChanged() || activeGuards.isEmpty());
GuardCapture capture(context->engine, this, &watcher);
QQmlEnginePrivate::PropertyCapture *lastPropertyCapture = ep->propertyCapture;
ep->propertyCapture = notifyOnValueChanged()?&capture:0;
if (notifyOnValueChanged())
capture.guards.copyAndClearPrepend(activeGuards);
QV4::ExecutionEngine *v4 = QV8Engine::getV4(ep->v8engine());
QV4::Scope scope(v4);
QV4::ScopedValue result(scope, QV4::Primitive::undefinedValue());
QV4::ExecutionContext *ctx = v4->currentContext();
callData->thisObject = v4->globalObject;
if (scopeObject()) {
QV4::ScopedValue value(scope, QV4::QObjectWrapper::wrap(ctx->d()->engine, scopeObject()));
if (value->isObject())
callData->thisObject = value;
}
result = function->asFunctionObject()->call(callData);
if (scope.hasException()) {
if (watcher.wasDeleted())
ctx->catchException(); // ignore exception
else
delayedError()->catchJavaScriptException(ctx);
if (isUndefined)
*isUndefined = true;
} else {
if (isUndefined)
*isUndefined = result->isUndefined();
if (!watcher.wasDeleted() && hasDelayedError())
delayedError()->clearError();
}
if (capture.errorString) {
for (int ii = 0; ii < capture.errorString->count(); ++ii)
qWarning("%s", qPrintable(capture.errorString->at(ii)));
delete capture.errorString;
capture.errorString = 0;
}
while (Guard *g = capture.guards.takeFirst())
g->Delete();
ep->propertyCapture = lastPropertyCapture;
return result.asReturnedValue();
}
void Serialize::serialize(QByteArray &data, const QV4::ValueRef v, QV8Engine *engine)
{
QV4::ExecutionEngine *v4 = QV8Engine::getV4(engine);
QV4::Scope scope(v4);
if (v->isEmpty()) {
Q_ASSERT(!"Serialize: got empty value");
} else if (v->isUndefined()) {
push(data, valueheader(WorkerUndefined));
} else if (v->isNull()) {
push(data, valueheader(WorkerNull));
} else if (v->isBoolean()) {
push(data, valueheader(v->booleanValue() == true ? WorkerTrue : WorkerFalse));
} else if (v->isString()) {
const QString &qstr = v->toQString();
int length = qstr.length();
if (length > 0xFFFFFF) {
push(data, valueheader(WorkerUndefined));
return;
}
int utf16size = ALIGN(length * sizeof(uint16_t));
reserve(data, utf16size + sizeof(quint32));
push(data, valueheader(WorkerString, length));
int offset = data.size();
data.resize(data.size() + utf16size);
char *buffer = data.data() + offset;
memcpy(buffer, qstr.constData(), length*sizeof(QChar));
} else if (v->asFunctionObject()) {
// XXX TODO: Implement passing function objects between the main and
// worker scripts
push(data, valueheader(WorkerUndefined));
} else if (v->asArrayObject()) {
QV4::ScopedArrayObject array(scope, v);
uint32_t length = array->getLength();
if (length > 0xFFFFFF) {
push(data, valueheader(WorkerUndefined));
return;
}
reserve(data, sizeof(quint32) + length * sizeof(quint32));
push(data, valueheader(WorkerArray, length));
ScopedValue val(scope);
for (uint32_t ii = 0; ii < length; ++ii)
serialize(data, (val = array->getIndexed(ii)), engine);
} else if (v->isInteger()) {
reserve(data, 2 * sizeof(quint32));
push(data, valueheader(WorkerInt32));
push(data, (quint32)v->integerValue());
// } else if (v->IsUint32()) {
// reserve(data, 2 * sizeof(quint32));
// push(data, valueheader(WorkerUint32));
// push(data, v->Uint32Value());
} else if (v->isNumber()) {
reserve(data, sizeof(quint32) + sizeof(double));
push(data, valueheader(WorkerNumber));
push(data, v->asDouble());
} else if (QV4::DateObject *d = v->asDateObject()) {
reserve(data, sizeof(quint32) + sizeof(double));
push(data, valueheader(WorkerDate));
push(data, d->date().asDouble());
} else if (v->as<RegExpObject>()) {
Scoped<RegExpObject> re(scope, v);
quint32 flags = re->flags();
QString pattern = re->source();
int length = pattern.length() + 1;
if (length > 0xFFFFFF) {
push(data, valueheader(WorkerUndefined));
return;
}
int utf16size = ALIGN(length * sizeof(uint16_t));
reserve(data, sizeof(quint32) + utf16size);
push(data, valueheader(WorkerRegexp, flags));
push(data, (quint32)length);
int offset = data.size();
data.resize(data.size() + utf16size);
char *buffer = data.data() + offset;
memcpy(buffer, pattern.constData(), length*sizeof(QChar));
} else if (v->as<QV4::QObjectWrapper>()) {
Scoped<QObjectWrapper> qobjectWrapper(scope, v);
// XXX TODO: Generalize passing objects between the main thread and worker scripts so
// that others can trivially plug in their elements.
QQmlListModel *lm = qobject_cast<QQmlListModel *>(qobjectWrapper->object());
if (lm && lm->agent()) {
QQmlListModelWorkerAgent *agent = lm->agent();
agent->addref();
push(data, valueheader(WorkerListModel));
push(data, (void *)agent);
return;
}
// No other QObject's are allowed to be sent
push(data, valueheader(WorkerUndefined));
} else if (v->asObject()) {
ScopedObject o(scope, v);
if (o->isListType()) {
// valid sequence. we generate a length (sequence length + 1 for the sequence type)
uint32_t seqLength = ScopedValue(scope, o->get(v4->id_length))->toUInt32();
uint32_t length = seqLength + 1;
if (length > 0xFFFFFF) {
push(data, valueheader(WorkerUndefined));
return;
}
reserve(data, sizeof(quint32) + length * sizeof(quint32));
push(data, valueheader(WorkerSequence, length));
serialize(data, QV4::Primitive::fromInt32(QV4::SequencePrototype::metaTypeForSequence(o)), engine); // sequence type
ScopedValue val(scope);
for (uint32_t ii = 0; ii < seqLength; ++ii)
serialize(data, (val = o->getIndexed(ii)), engine); // sequence elements
return;
}
// regular object
QV4::ScopedValue val(scope, *v);
QV4::ScopedArrayObject properties(scope, QV4::ObjectPrototype::getOwnPropertyNames(v4, val));
quint32 length = properties->getLength();
if (length > 0xFFFFFF) {
push(data, valueheader(WorkerUndefined));
return;
}
push(data, valueheader(WorkerObject, length));
QV4::ScopedValue s(scope);
QV4::ScopedString str(scope);
for (quint32 ii = 0; ii < length; ++ii) {
s = properties->getIndexed(ii);
serialize(data, s, engine);
QV4::ExecutionContext *ctx = v4->currentContext();
str = s;
val = o->get(str.getPointer());
if (scope.hasException())
ctx->catchException();
serialize(data, val, engine);
}
return;
} else {
push(data, valueheader(WorkerUndefined));
}
}