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+/****************************************************************************
+**
+** Copyright (C) 2009 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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, 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QPERFORMANCELOG_H
+#define QPERFORMANCELOG_H
+
+#include <QtCore/qdatetime.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QPerformanceLog
+{
+    Q_DECLARATIVE_EXPORT void displayData();
+    Q_DECLARATIVE_EXPORT void clear();
+
+#ifdef Q_ENABLE_PERFORMANCE_LOG
+    struct LogData {
+        LogData(const char *);
+        QTime timer;
+        int sumTime;
+        unsigned int *data;
+    };
+
+    struct LogMetric {
+        LogMetric(LogData *, int, const char *);
+    };
+
+    // Internal
+    void displayData(LogData *);
+    void clear(LogData *);
+#endif
+}
+
+#ifdef Q_ENABLE_PERFORMANCE_LOG
+
+#define Q_DECLARE_PERFORMANCE_METRIC(name) \
+    enum { name = ValueChoice<0, ValueTracker<0, __LINE__>::value, __LINE__>::value };  \
+    template<int L> \
+    struct ValueTracker<name, L> \
+    { \
+        enum { value = name }; \
+    }; \
+    extern QPerformanceLog::LogMetric metric ## name; 
+
+#define Q_DECLARE_PERFORMANCE_LOG(name) \
+    namespace name { \
+        extern QPerformanceLog::LogData log; \
+        inline void displayData() { QPerformanceLog::displayData(&log); } \
+        inline void clear() { QPerformanceLog::clear(&log); } \
+    } \
+    template<int N> \
+    class name ## Timer { \
+    public: \
+            name ## Timer() { \
+                lastSum = name::log.sumTime + name::log.timer.restart(); \
+                name::log.sumTime = 0; \
+            } \
+            ~ name ## Timer() { \
+                name::log.data[2 * N] += name::log.sumTime + name::log.timer.restart(); \
+                ++name::log.data[2 * N + 1]; \
+                name::log.sumTime = lastSum; \
+            } \
+    private: \
+             int lastSum; \
+    }; \
+    namespace name { \
+        template<int N, int L> \
+        struct ValueTracker \
+        { \
+            enum { value = -1 }; \
+        }; \
+        template<int DefNextValue, int NextValue, int L> \
+        struct ValueChoice \
+        { \
+            enum { value = ValueChoice<DefNextValue + 1, ValueTracker<DefNextValue + 1, L>::value, L>::value }; \
+        }; \
+        template<int DefNextValue, int L> \
+        struct ValueChoice<DefNextValue, -1, L> \
+        { \
+            enum { value = DefNextValue }; \
+        }; \
+    } \
+    namespace name 
+
+#define Q_DEFINE_PERFORMANCE_LOG(name, desc) \
+    QPerformanceLog::LogData name::log(desc); \
+    namespace name 
+
+#define Q_DEFINE_PERFORMANCE_METRIC(name, desc) \
+    QPerformanceLog::LogMetric metrix ## name(&log, name, desc); 
+
+#else // Q_ENABLE_PERFORMANCE_LOG
+
+#define Q_DECLARE_PERFORMANCE_METRIC(name)
+#define Q_DECLARE_PERFORMANCE_LOG(name) namespace name
+#define Q_DEFINE_PERFORMANCE_LOG(name, desc) namespace name
+#define Q_DEFINE_PERFORMANCE_METRIC(name, desc) 
+
+#endif // Q_ENABLE_PERFORMANCE_LOG
+
+QT_END_NAMESPACE
+
+#endif // QPERFORMANCELOG_H