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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QQMLVME_P_H
#define QQMLVME_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <private/qrecursionwatcher_p.h>
#include <QtCore/QStack>
#include <QtCore/QString>
#include <QtCore/qelapsedtimer.h>
#include <QtCore/qdeadlinetimer.h>
#include <QtCore/qcoreapplication.h>
#include <QtCore/qtypeinfo.h>
#include <private/qqmlengine_p.h>
#include <private/qfinitestack_p.h>
#include <atomic>
QT_BEGIN_NAMESPACE
class QObject;
class QQmlInstantiationInterrupt {
public:
inline QQmlInstantiationInterrupt();
inline QQmlInstantiationInterrupt(std::atomic<bool> *runWhile,
QDeadlineTimer deadline = QDeadlineTimer::Forever);
inline QQmlInstantiationInterrupt(QDeadlineTimer deadline);
inline bool shouldInterrupt() const;
private:
enum Mode { None, Time, Flag };
Mode mode;
QDeadlineTimer deadline;
std::atomic<bool> *runWhile = nullptr;
};
class Q_QML_EXPORT QQmlVME
{
public:
static void enableComponentComplete();
static void disableComponentComplete();
static bool componentCompleteEnabled();
private:
static bool s_enableComponentComplete;
};
// Used to check that a QQmlVME that is interrupted mid-execution
// is still valid. Checks all the objects and contexts have not been
// deleted.
//
// VME stands for Virtual Machine Execution. QML files used to
// be compiled to a byte code data structure that a virtual machine executed
// (for constructing the tree of QObjects and setting properties).
class QQmlVMEGuard
{
public:
QQmlVMEGuard();
~QQmlVMEGuard();
void guard(QQmlObjectCreator *);
void clear();
bool isOK() const;
private:
int m_objectCount;
QQmlGuard<QObject> *m_objects;
int m_contextCount;
QQmlGuardedContextData *m_contexts;
};
QQmlInstantiationInterrupt::QQmlInstantiationInterrupt()
: mode(None)
{
}
QQmlInstantiationInterrupt::QQmlInstantiationInterrupt(std::atomic<bool> *runWhile, QDeadlineTimer deadline)
: mode(Flag), deadline(deadline), runWhile(runWhile)
{
}
QQmlInstantiationInterrupt::QQmlInstantiationInterrupt(QDeadlineTimer deadline)
: mode(Time), deadline(deadline)
{
}
bool QQmlInstantiationInterrupt::shouldInterrupt() const
{
switch (mode) {
case None:
return false;
case Time:
return deadline.hasExpired();
case Flag:
return !runWhile->load(std::memory_order_acquire) || deadline.hasExpired();
}
Q_UNREACHABLE_RETURN(false);
}
QT_END_NAMESPACE
#endif // QQMLVME_P_H
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