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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QV4INTERNALCLASS_H
#define QV4INTERNALCLASS_H
#include <QHash>
#include <QVector>
#include "qv4global_p.h"
QT_BEGIN_NAMESPACE
namespace QV4 {
struct String;
struct ExecutionEngine;
struct Object;
struct Identifier;
struct PropertyHashData;
struct PropertyHash
{
struct Entry {
const Identifier *identifier;
uint index;
};
PropertyHashData *d;
inline PropertyHash();
inline PropertyHash(const PropertyHash &other);
inline ~PropertyHash();
void addEntry(const Entry &entry, int classSize);
uint lookup(const Identifier *identifier) const;
private:
PropertyHash &operator=(const PropertyHash &other);
};
struct PropertyHashData
{
PropertyHashData(int numBits);
~PropertyHashData() {
free(entries);
}
QBasicAtomicInt refCount;
int alloc;
int size;
int numBits;
PropertyHash::Entry *entries;
};
inline PropertyHash::PropertyHash()
{
d = new PropertyHashData(3);
}
inline PropertyHash::PropertyHash(const PropertyHash &other)
{
d = other.d;
d->refCount.ref();
}
inline PropertyHash::~PropertyHash()
{
if (!d->refCount.deref())
delete d;
}
struct InternalClassTransition
{
union {
Identifier *id;
Object *prototype;
};
int flags;
enum { ProtoChange = 0x100 };
bool operator==(const InternalClassTransition &other) const
{ return id == other.id && flags == other.flags; }
};
uint qHash(const QV4::InternalClassTransition &t, uint = 0);
struct InternalClass {
ExecutionEngine *engine;
Object *prototype;
PropertyHash propertyTable; // id to valueIndex
QVector<String *> nameMap;
QVector<PropertyAttributes> propertyData;
typedef InternalClassTransition Transition;
QHash<Transition, InternalClass *> transitions; // id to next class, positive means add, negative delete
InternalClass *m_sealed;
InternalClass *m_frozen;
uint size;
InternalClass *changePrototype(Object *proto);
InternalClass *addMember(String *string, PropertyAttributes data, uint *index = 0);
InternalClass *changeMember(String *string, PropertyAttributes data, uint *index = 0);
void removeMember(Object *object, Identifier *id);
uint find(String *s);
InternalClass *sealed();
InternalClass *frozen();
void destroy();
void markObjects();
private:
friend struct ExecutionEngine;
InternalClass(ExecutionEngine *engine) : engine(engine), prototype(0), m_sealed(0), m_frozen(0), size(0) {}
InternalClass(const InternalClass &other);
};
}
QT_END_NAMESPACE
#endif
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