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Introduce more generic fast property handling
Also reduce the number of direct calls to qt_metacall(). Change-Id: I04cd6e516a3e61058548309a19fe0b830f15c93f Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>
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Aaron Kennedy
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Qt by Nokia
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Dec 5, 2011
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/**************************************************************************** | ||
** | ||
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | ||
** All rights reserved. | ||
** Contact: Nokia Corporation (qt-info@nokia.com) | ||
** | ||
** This file is part of the QtDeclarative module of the Qt Toolkit. | ||
** | ||
** $QT_BEGIN_LICENSE:LGPL$ | ||
** GNU Lesser General Public License Usage | ||
** 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, Nokia gives you certain additional | ||
** rights. These rights are described in the Nokia 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. | ||
** | ||
** Other Usage | ||
** Alternatively, this file may be used in accordance with the terms and | ||
** conditions contained in a signed written agreement between you and Nokia. | ||
** | ||
** | ||
** | ||
** | ||
** | ||
** $QT_END_LICENSE$ | ||
** | ||
****************************************************************************/ | ||
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#include "qdeclarativeaccessors_p.h" | ||
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#include "qdeclarativedata_p.h" | ||
#include "qdeclarativenotifier_p.h" | ||
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QT_BEGIN_NAMESPACE | ||
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struct AccessorProperties { | ||
AccessorProperties(); | ||
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QReadWriteLock lock; | ||
QHash<const QMetaObject *, QDeclarativeAccessorProperties::Properties> properties; | ||
}; | ||
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Q_GLOBAL_STATIC(AccessorProperties, accessorProperties) | ||
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QML_PRIVATE_ACCESSOR(QObject, QString, objectName, objectName) | ||
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static void QObject_objectNameNotifier(QObject *object, intptr_t, QDeclarativeNotifier **notifier) | ||
{ | ||
*notifier = QDeclarativeData::get(object, true)->objectNameNotifier(); | ||
} | ||
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static QDeclarativeAccessors QObject_objectName = { QObject_objectNameRead, | ||
QObject_objectNameNotifier }; | ||
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QML_DECLARE_PROPERTIES(QObject) { | ||
{ QML_PROPERTY_NAME(objectName), 0, &QObject_objectName } | ||
}; | ||
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static void buildNameMask(QDeclarativeAccessorProperties::Properties &properties) | ||
{ | ||
quint32 mask = 0; | ||
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for (int ii = 0; ii < properties.count; ++ii) { | ||
Q_ASSERT(strlen(properties.properties[ii].name) == properties.properties[ii].nameLength); | ||
Q_ASSERT(properties.properties[ii].nameLength > 0); | ||
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mask |= (1 << qMin(31U, properties.properties[ii].nameLength - 1)); | ||
} | ||
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properties.nameMask = mask; | ||
} | ||
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AccessorProperties::AccessorProperties() | ||
{ | ||
// Pre-seed QObject::objectName accessor | ||
typedef QDeclarativeAccessorProperties::Properties P; | ||
properties.insert(&QObject::staticMetaObject, | ||
P(qdeclarative_accessor_properties_QObject, | ||
sizeof(qdeclarative_accessor_properties_QObject) / | ||
sizeof(QDeclarativeAccessorProperties::Property))); | ||
} | ||
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QDeclarativeAccessorProperties::Properties::Properties(Property *properties, int count) | ||
: count(count), properties(properties) | ||
{ | ||
buildNameMask(*this); | ||
} | ||
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QDeclarativeAccessorProperties::Properties | ||
QDeclarativeAccessorProperties::properties(const QMetaObject *mo) | ||
{ | ||
AccessorProperties *This = accessorProperties(); | ||
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QReadLocker lock(&This->lock); | ||
return This->properties.value(mo); | ||
} | ||
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void QDeclarativeAccessorProperties::registerProperties(const QMetaObject *mo, int count, | ||
Property *props) | ||
{ | ||
Q_ASSERT(count > 0); | ||
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Properties properties(props, count); | ||
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AccessorProperties *This = accessorProperties(); | ||
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QWriteLocker lock(&This->lock); | ||
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Q_ASSERT(!This->properties.contains(mo) || This->properties.value(mo) == properties); | ||
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This->properties.insert(mo, properties); | ||
} | ||
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QT_END_NAMESPACE |
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/**************************************************************************** | ||
** | ||
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | ||
** All rights reserved. | ||
** Contact: Nokia Corporation (qt-info@nokia.com) | ||
** | ||
** This file is part of the QtDeclarative module of the Qt Toolkit. | ||
** | ||
** $QT_BEGIN_LICENSE:LGPL$ | ||
** GNU Lesser General Public License Usage | ||
** 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, Nokia gives you certain additional | ||
** rights. These rights are described in the Nokia 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. | ||
** | ||
** Other Usage | ||
** Alternatively, this file may be used in accordance with the terms and | ||
** conditions contained in a signed written agreement between you and Nokia. | ||
** | ||
** | ||
** | ||
** | ||
** | ||
** $QT_END_LICENSE$ | ||
** | ||
****************************************************************************/ | ||
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#ifndef QDECLARATIVEACCESSORS_P_H | ||
#define QDECLARATIVEACCESSORS_P_H | ||
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#include <QtCore/qvector.h> | ||
#include <QtCore/qhash.h> | ||
#include <QtCore/QReadWriteLock> | ||
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QT_BEGIN_HEADER | ||
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QT_BEGIN_NAMESPACE | ||
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class QObject; | ||
class QDeclarativeNotifier; | ||
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// QML "accessor properties" allow V4 and V8 to bypass Qt's meta system to read and, more | ||
// importantly, subscribe to properties directly. Any property that is primarily read | ||
// from bindings is a candidate for inclusion as an accessor property. | ||
// | ||
// To define accessor properties, use the QML_DECLARE_PROPERTIES() and QML_DEFINE_PROPERTIES() | ||
// macros. The QML_DECLARE_PROPERTIES() macro is used to specify the properties, and the | ||
// QML_DEFINE_PROPERTIES() macro to register the properties with the | ||
// QDeclarativeAccessorProperties singleton. | ||
// | ||
// A class with accessor properties must also add the Q_CLASSINFO("qt_HasQmlAccessors", "true") | ||
// tag to its declaration. This is essential for QML to maintain internal consistency, | ||
// and forgetting to do so will probably cause your application to qFatal() with a | ||
// helpful reminder of this requirement. | ||
// | ||
// It is important that QML_DEFINE_PROPERTIES() has been called before QML ever sees | ||
// the type with the accessor properties. As QML_DEFINE_PROPERTIES() is idempotent, it is | ||
// recommended to call it in the type's constructor as well as when the type is registered | ||
// as a QML element (if it ever is). QML_DEFINE_PROPERTIES() is a very cheap operation | ||
// if registration has already occurred. | ||
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#define QML_DECLARE_PROPERTIES(type) \ | ||
static volatile bool qdeclarative_accessor_properties_isregistered_ ## type = false; \ | ||
static QDeclarativeAccessorProperties::Property qdeclarative_accessor_properties_ ## type[] = | ||
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#define QML_DEFINE_PROPERTIES(type) \ | ||
do { \ | ||
if (!qdeclarative_accessor_properties_isregistered_ ## type) { \ | ||
int count = sizeof(qdeclarative_accessor_properties_ ## type) / \ | ||
sizeof(QDeclarativeAccessorProperties::Property); \ | ||
QDeclarativeAccessorProperties::registerProperties(&type::staticMetaObject, count, \ | ||
qdeclarative_accessor_properties_ ## type);\ | ||
qdeclarative_accessor_properties_isregistered_ ## type = true; \ | ||
} \ | ||
} while (false); | ||
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#define QML_PRIVATE_ACCESSOR(clazz, cpptype, name, variable) \ | ||
static void clazz ## _ ## name ## Read(QObject *o, intptr_t, void *rv) \ | ||
{ \ | ||
clazz ## Private *d = clazz ## Private::get(static_cast<clazz *>(o)); \ | ||
*static_cast<cpptype *>(rv) = d->variable; \ | ||
} | ||
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#define QML_PROPERTY_NAME(name) #name, sizeof #name - 1 | ||
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struct QDeclarativeAccessors | ||
{ | ||
void (*read)(QObject *object, intptr_t property, void *output); | ||
void (*notifier)(QObject *object, intptr_t property, QDeclarativeNotifier **notifier); | ||
}; | ||
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namespace QDeclarativeAccessorProperties { | ||
struct Property { | ||
const char *name; | ||
unsigned int nameLength; | ||
intptr_t data; | ||
QDeclarativeAccessors *accessors; | ||
}; | ||
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struct Properties { | ||
inline Properties(); | ||
Properties(Property *, int); | ||
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bool operator==(const Properties &o) const { | ||
return count == o.count && properties == o.properties; | ||
} | ||
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inline Property *property(const char *name); | ||
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int count; | ||
Property *properties; | ||
quint32 nameMask; | ||
}; | ||
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Properties properties(const QMetaObject *); | ||
void Q_DECLARATIVE_EXPORT registerProperties(const QMetaObject *, int, Property *); | ||
}; | ||
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QDeclarativeAccessorProperties::Property * | ||
QDeclarativeAccessorProperties::Properties::property(const char *name) | ||
{ | ||
if (count == 0) | ||
return 0; | ||
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unsigned int length = strlen(name); | ||
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Q_ASSERT(length); | ||
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if (nameMask & (1 << qMin(31U, length - 1))) { | ||
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for (int ii = 0; ii < count; ++ii) { | ||
if (properties[ii].nameLength == length && 0 == qstrcmp(name, properties[ii].name)) | ||
return &properties[ii]; | ||
} | ||
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} | ||
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return 0; | ||
} | ||
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QDeclarativeAccessorProperties::Properties::Properties() | ||
: count(0), properties(0), nameMask(0) | ||
{ | ||
} | ||
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QT_END_NAMESPACE | ||
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QT_END_HEADER | ||
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#endif // QDECLARATIVEACCESSORS_P_H |
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