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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QV4PERSISTENT_H
#define QV4PERSISTENT_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 "qv4value_p.h"
#include "qv4managed_p.h"
QT_BEGIN_NAMESPACE
namespace QV4 {
struct Q_QML_EXPORT PersistentValueStorage
{
PersistentValueStorage(ExecutionEngine *engine);
~PersistentValueStorage();
Value *allocate();
static void free(Value *e);
void mark(ExecutionEngine *e);
struct Iterator {
Iterator(void *p, int idx);
Iterator(const Iterator &o);
Iterator & operator=(const Iterator &o);
~Iterator();
void *p;
int index;
Iterator &operator++();
bool operator !=(const Iterator &other) {
return p != other.p || index != other.index;
}
Value &operator *();
};
Iterator begin() { return Iterator(firstPage, 0); }
Iterator end() { return Iterator(0, 0); }
static ExecutionEngine *getEngine(Value *v);
ExecutionEngine *engine;
void *firstPage;
private:
static void freePage(void *page);
};
class Q_QML_EXPORT PersistentValue
{
public:
PersistentValue() : val(0) {}
PersistentValue(const PersistentValue &other);
PersistentValue &operator=(const PersistentValue &other);
PersistentValue &operator=(const WeakValue &other);
PersistentValue &operator=(Object *object);
~PersistentValue();
PersistentValue(ExecutionEngine *engine, const Value &value);
PersistentValue(ExecutionEngine *engine, ReturnedValue value);
PersistentValue(ExecutionEngine *engine, Object *object);
void set(ExecutionEngine *engine, const Value &value);
void set(ExecutionEngine *engine, ReturnedValue value);
void set(ExecutionEngine *engine, Heap::Base *obj);
ReturnedValue value() const {
return (val ? val->asReturnedValue() : Encode::undefined());
}
Value *valueRef() const {
return val;
}
Managed *asManaged() const {
if (!val)
return 0;
return val->as<Managed>();
}
template<typename T>
T *as() const {
if (!val)
return 0;
return val->as<T>();
}
ExecutionEngine *engine() const {
if (!val)
return 0;
return PersistentValueStorage::getEngine(val);
}
bool isUndefined() const { return !val || val->isUndefined(); }
bool isNullOrUndefined() const { return !val || val->isNullOrUndefined(); }
void clear() {
PersistentValueStorage::free(val);
val = 0;
}
bool isEmpty() { return !val; }
private:
Value *val;
};
class Q_QML_EXPORT WeakValue
{
public:
WeakValue() : val(0) {}
WeakValue(const WeakValue &other);
WeakValue(ExecutionEngine *engine, const Value &value);
WeakValue &operator=(const WeakValue &other);
~WeakValue();
void set(ExecutionEngine *engine, const Value &value);
void set(ExecutionEngine *engine, ReturnedValue value);
void set(ExecutionEngine *engine, Heap::Base *obj);
ReturnedValue value() const {
return (val ? val->asReturnedValue() : Encode::undefined());
}
Value *valueRef() const {
return val;
}
Managed *asManaged() const {
if (!val)
return 0;
return val->as<Managed>();
}
template <typename T>
T *as() const {
if (!val)
return 0;
return val->as<T>();
}
ExecutionEngine *engine() const {
if (!val)
return 0;
return PersistentValueStorage::getEngine(val);
}
bool isUndefined() const { return !val || val->isUndefined(); }
bool isNullOrUndefined() const { return !val || val->isNullOrUndefined(); }
void clear() {
PersistentValueStorage::free(val);
val = 0;
}
void markOnce(ExecutionEngine *e);
private:
Value *val;
};
} // namespace QV4
QT_END_NAMESPACE
#endif
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