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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#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 "qqmlerror.h"
#include <private/qbitfield_p.h>
#include <private/qrecursionwatcher_p.h>
#include <QtCore/QStack>
#include <QtCore/QString>
#include <QtCore/qelapsedtimer.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 QJSValue;
class QQmlScriptData;
class QQmlContextData;
namespace QQmlVMETypes {
struct List
{
List() : type(0) {}
List(int t) : type(t) {}
int type;
QQmlListProperty<void> qListProperty;
};
struct State {
enum Flag { Deferred = 0x00000001 };
State() : flags(0), context(nullptr), instructionStream(nullptr) {}
quint32 flags;
QQmlContextData *context;
const char *instructionStream;
QBitField bindingSkipList;
};
}
Q_DECLARE_TYPEINFO(QQmlVMETypes::List, Q_PRIMITIVE_TYPE | Q_MOVABLE_TYPE);
template<>
class QTypeInfo<QQmlVMETypes::State> : public QTypeInfoMerger<QQmlVMETypes::State, QBitField> {}; //Q_DECLARE_TYPEINFO
class QQmlInstantiationInterrupt {
public:
inline QQmlInstantiationInterrupt();
// ### Qt 6: remove
inline QQmlInstantiationInterrupt(volatile bool *runWhile, qint64 nsecs=0);
inline QQmlInstantiationInterrupt(std::atomic<bool> *runWhile, qint64 nsecs = 0);
inline QQmlInstantiationInterrupt(qint64 nsecs);
inline void reset();
inline bool shouldInterrupt() const;
private:
enum Mode { None, Time, LegacyFlag, Flag }; // ### Qt 6: remove LegacyFlag
Mode mode;
QElapsedTimer timer;
qint64 nsecs = 0;
volatile bool *runWhileLegacy = nullptr; // ### Qt 6: remove
std::atomic<bool> *runWhile = nullptr;
};
class Q_QML_PRIVATE_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;
QPointer<QObject> *m_objects;
int m_contextCount;
QQmlGuardedContextData *m_contexts;
};
QQmlInstantiationInterrupt::QQmlInstantiationInterrupt()
: mode(None)
{
}
QQmlInstantiationInterrupt::QQmlInstantiationInterrupt(volatile bool *runWhile, qint64 nsecs)
: mode(LegacyFlag), nsecs(nsecs), runWhileLegacy(runWhile)
{
}
QQmlInstantiationInterrupt::QQmlInstantiationInterrupt(std::atomic<bool> *runWhile, qint64 nsecs)
: mode(Flag), nsecs(nsecs), runWhile(runWhile)
{
}
QQmlInstantiationInterrupt::QQmlInstantiationInterrupt(qint64 nsecs)
: mode(Time), nsecs(nsecs)
{
}
void QQmlInstantiationInterrupt::reset()
{
if (mode == Time || nsecs)
timer.start();
}
bool QQmlInstantiationInterrupt::shouldInterrupt() const
{
switch (mode) {
case None:
return false;
case Time:
return timer.nsecsElapsed() > nsecs;
case LegacyFlag:
return !*runWhileLegacy || (nsecs && timer.nsecsElapsed() > nsecs);
case Flag:
return !runWhile->load(std::memory_order_acquire) || (nsecs && timer.nsecsElapsed() > nsecs);
}
Q_UNREACHABLE();
return false;
}
QT_END_NAMESPACE
#endif // QQMLVME_P_H
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