1 /****************************************************************************
3 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4 ** All rights reserved.
5 ** Contact: Nokia Corporation (qt-info@nokia.com)
7 ** This file is part of the QtDeclarative module of the Qt Toolkit.
9 ** $QT_BEGIN_LICENSE:LGPL$
10 ** No Commercial Usage
11 ** This file contains pre-release code and may not be distributed.
12 ** You may use this file in accordance with the terms and conditions
13 ** contained in the Technology Preview License Agreement accompanying
16 ** GNU Lesser General Public License Usage
17 ** Alternatively, this file may be used under the terms of the GNU Lesser
18 ** General Public License version 2.1 as published by the Free Software
19 ** Foundation and appearing in the file LICENSE.LGPL included in the
20 ** packaging of this file. Please review the following information to
21 ** ensure the GNU Lesser General Public License version 2.1 requirements
22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
24 ** In addition, as a special exception, Nokia gives you certain additional
25 ** rights. These rights are described in the Nokia Qt LGPL Exception
26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
28 ** If you have questions regarding the use of this file, please contact
29 ** Nokia at qt-info@nokia.com.
40 ****************************************************************************/
42 #ifndef QDECLARATIVEPOOL_P_H
43 #define QDECLARATIVEPOOL_P_H
49 // This file is not part of the Qt API. It exists purely as an
50 // implementation detail. This header file may change from version to
51 // version without notice, or even be removed.
56 #include <QtCore/qglobal.h>
57 #include <QtCore/qstring.h>
61 class QDeclarativePool
64 // The class has a destructor that needs to be called
67 inline QDeclarativePool *pool() const;
70 void *operator new(size_t);
71 void *operator new(size_t, void *m) { return m; }
72 friend class QDeclarativePool;
74 QDeclarativePool *_pool;
76 void (*_destroy)(Class *);
79 // The class is plain old data and no destructor needs to
83 inline QDeclarativePool *pool() const;
86 void *operator new(size_t);
87 void *operator new(size_t, void *m) { return m; }
88 friend class QDeclarativePool;
90 QDeclarativePool *_pool;
93 inline QDeclarativePool();
94 inline ~QDeclarativePool();
103 inline T *NewRawArray(int length);
105 inline QString *NewString(const QString &);
106 inline QByteArray *NewByteArray(const QByteArray &);
109 struct StringClass : public QString, public Class {
111 struct ByteArrayClass : public QByteArray, public Class {
114 inline void *allocate(int size);
118 inline void initialize(POD *);
120 inline void initialize(Class *);
122 static void destroy(Class *c);
130 static const int pageSize = 4 * 4096 - sizeof(Header);
132 char memory[pageSize];
139 QDeclarativePool::QDeclarativePool()
140 : _page(0), _classList(0)
144 QDeclarativePool::~QDeclarativePool()
150 T *QDeclarativePool::New()
152 T *rv = new (allocate(sizeof(T))) T;
159 T *QDeclarativePool::NewRaw()
161 return (T*)allocate(sizeof(T));
165 T *QDeclarativePool::NewRawArray(int length)
167 return (T*)allocate(length * sizeof(T));
170 QString *QDeclarativePool::NewString(const QString &s)
172 QString *rv = New<StringClass>();
177 QByteArray *QDeclarativePool::NewByteArray(const QByteArray &s)
179 QByteArray *rv = New<ByteArrayClass>();
184 void *QDeclarativePool::allocate(int size)
186 if (!_page || (_page->header.free + size) > (_page->memory + Page::pageSize))
189 void *rv = _page->header.free;
190 _page->header.free += size + ((8 - size) & 7); // ensure 8 byte alignment;
195 void QDeclarativePool::initialize(QDeclarativePool::POD *)
200 void QDeclarativePool::initialize(QDeclarativePool::Class *c)
202 c->_next = _classList;
203 c->_destroy = &destroy<T>;
208 void QDeclarativePool::destroy(Class *c)
210 static_cast<T *>(c)->~T();
213 QDeclarativePool *QDeclarativePool::Class::pool() const
218 QDeclarativePool *QDeclarativePool::POD::pool() const
225 #endif // QDECLARATIVEPOOL_P_H