[BB10-internal] Revert "[BB10-internal] Remove QPerformanceTimer now that QElapsedTimer contains the necessary bits"

This reverts commit 88966515993773e4d7d6276bce6fccfcc13ab6f4.

This apparently caused regressions in Cascades.

Change-Id: I004a89ff387fa4af6e11d77ff271e437d2f8e170
Signed-off-by: Peter Hartmann <phartmann@rim.com>

10 files changed, 554 insertions, 13 deletions

diff --git a/src/declarative/debugger/qdeclarativedebugtrace.cpp b/src/declarative/debugger/qdeclarativedebugtrace.cpp
index 3d3606b3a0..2a988790f6 100644
--- a/src/declarative/debugger/qdeclarativedebugtrace.cpp
+++ b/src/declarative/debugger/qdeclarativedebugtrace.cpp
@@ -109,7 +109,7 @@ Q_GLOBAL_STATIC(QDeclarativeDebugTrace, traceInstance);
 
 // convert to a QByteArray that can be sent to the debug client
 // use of QDataStream can skew results if m_deferredSend == false
-//     (see tst_qdeclarativedebugtrace::trace() benchmark)
+//     (see tst_qperformancetimer::trace() benchmark)
 QByteArray QDeclarativeDebugData::toByteArray() const
 {
     QByteArray data;
@@ -182,7 +182,7 @@ void QDeclarativeDebugTrace::addEventImpl(EventType event)
     if (status() != Enabled || !m_enabled)
         return;
 
-    QDeclarativeDebugData ed = {m_timer.nsecsElapsed(), (int)Event, (int)event, QString(), -1};
+    QDeclarativeDebugData ed = {m_timer.elapsed(), (int)Event, (int)event, QString(), -1};
     processMessage(ed);
 }
 
@@ -191,7 +191,7 @@ void QDeclarativeDebugTrace::startRangeImpl(RangeType range)
     if (status() != Enabled || !m_enabled)
         return;
 
-    QDeclarativeDebugData rd = {m_timer.nsecsElapsed(), (int)RangeStart, (int)range, QString(), -1};
+    QDeclarativeDebugData rd = {m_timer.elapsed(), (int)RangeStart, (int)range, QString(), -1};
     processMessage(rd);
 }
 
@@ -200,7 +200,7 @@ void QDeclarativeDebugTrace::rangeDataImpl(RangeType range, const QString &rData
     if (status() != Enabled || !m_enabled)
         return;
 
-    QDeclarativeDebugData rd = {m_timer.nsecsElapsed(), (int)RangeData, (int)range, rData, -1};
+    QDeclarativeDebugData rd = {m_timer.elapsed(), (int)RangeData, (int)range, rData, -1};
     processMessage(rd);
 }
 
@@ -209,7 +209,7 @@ void QDeclarativeDebugTrace::rangeDataImpl(RangeType range, const QUrl &rData)
     if (status() != Enabled || !m_enabled)
         return;
 
-    QDeclarativeDebugData rd = {m_timer.nsecsElapsed(), (int)RangeData, (int)range, rData.toString(QUrl::FormattingOption(0x100)), -1};
+    QDeclarativeDebugData rd = {m_timer.elapsed(), (int)RangeData, (int)range, rData.toString(QUrl::FormattingOption(0x100)), -1};
     processMessage(rd);
 }
 
@@ -218,7 +218,7 @@ void QDeclarativeDebugTrace::rangeLocationImpl(RangeType range, const QString &f
     if (status() != Enabled || !m_enabled)
         return;
 
-    QDeclarativeDebugData rd = {m_timer.nsecsElapsed(), (int)RangeLocation, (int)range, fileName, line};
+    QDeclarativeDebugData rd = {m_timer.elapsed(), (int)RangeLocation, (int)range, fileName, line};
     processMessage(rd);
 }
 
@@ -227,7 +227,7 @@ void QDeclarativeDebugTrace::rangeLocationImpl(RangeType range, const QUrl &file
     if (status() != Enabled || !m_enabled)
         return;
 
-    QDeclarativeDebugData rd = {m_timer.nsecsElapsed(), (int)RangeLocation, (int)range, fileName.toString(QUrl::FormattingOption(0x100)), line};
+    QDeclarativeDebugData rd = {m_timer.elapsed(), (int)RangeLocation, (int)range, fileName.toString(QUrl::FormattingOption(0x100)), line};
     processMessage(rd);
 }
 
@@ -236,7 +236,7 @@ void QDeclarativeDebugTrace::endRangeImpl(RangeType range)
     if (status() != Enabled || !m_enabled)
         return;
 
-    QDeclarativeDebugData rd = {m_timer.nsecsElapsed(), (int)RangeEnd, (int)range, QString(), -1};
+    QDeclarativeDebugData rd = {m_timer.elapsed(), (int)RangeEnd, (int)range, QString(), -1};
     processMessage(rd);
 }
 
diff --git a/src/declarative/debugger/qdeclarativedebugtrace_p.h b/src/declarative/debugger/qdeclarativedebugtrace_p.h
index 77d55d7718..e222a42972 100644
--- a/src/declarative/debugger/qdeclarativedebugtrace_p.h
+++ b/src/declarative/debugger/qdeclarativedebugtrace_p.h
@@ -43,7 +43,8 @@
 #define QDECLARATIVEDEBUGTRACE_P_H
 
 #include <private/qdeclarativedebugservice_p.h>
-#include <qelapsedtimer.h>
+#include <private/qperformancetimer_p.h>
+#include <QtCore/qglobal.h>
 
 QT_BEGIN_HEADER
 
@@ -133,7 +134,7 @@ private:
 #endif
     void processMessage(const QDeclarativeDebugData &);
     void sendMessages();
-    QElapsedTimer m_timer;
+    QPerformanceTimer m_timer;
     bool m_enabled;
     bool m_deferredSend;
     bool m_messageReceived;
diff --git a/src/declarative/qml/qml.pri b/src/declarative/qml/qml.pri
index 08b67b6f75..5d171bfe41 100644
--- a/src/declarative/qml/qml.pri
+++ b/src/declarative/qml/qml.pri
@@ -54,7 +54,8 @@ SOURCES += \
     $$PWD/qdeclarativedirparser.cpp \
     $$PWD/qdeclarativeextensionplugin.cpp \
     $$PWD/qdeclarativeimport.cpp \
-    $$PWD/qdeclarativelist.cpp
+    $$PWD/qdeclarativelist.cpp \ 
+    $$PWD/qperformancetimer.cpp
 
 HEADERS += \
     $$PWD/qdeclarativeparser_p.h \
@@ -127,7 +128,8 @@ HEADERS += \
     $$PWD/qdeclarativedirparser_p.h \
     $$PWD/qdeclarativeextensioninterface.h \
     $$PWD/qdeclarativeimport_p.h \
-    $$PWD/qdeclarativeextensionplugin.h
+    $$PWD/qdeclarativeextensionplugin.h \
+    $$PWD/qperformancetimer_p.h
 
 QT += sql
 include(parser/parser.pri)
diff --git a/src/declarative/qml/qperformancetimer.cpp b/src/declarative/qml/qperformancetimer.cpp
new file mode 100644
index 0000000000..91d4acbee9
--- /dev/null
+++ b/src/declarative/qml/qperformancetimer.cpp
@@ -0,0 +1,263 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtDeclarative 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qperformancetimer_p.h"
+
+#if defined(Q_OS_MAC)
+#include <sys/time.h>
+#include <unistd.h>
+#include <mach/mach_time.h>
+#elif defined(Q_OS_SYMBIAN)
+#include <e32std.h>
+#include <sys/time.h>
+#include <hal.h>
+#include <hal_data.h>
+#elif defined(Q_OS_UNIX)
+#include <sys/time.h>
+#include <time.h>
+#include <unistd.h>
+#elif defined(Q_OS_WIN)
+#include <windows.h>
+#endif
+
+// mac/unix code heavily copied from QElapsedTimer
+
+QT_BEGIN_NAMESPACE
+
+////////////////////////////// Mac //////////////////////////////
+#if defined(Q_OS_MAC)
+
+static mach_timebase_info_data_t info = {0,0};
+static qint64 absoluteToNSecs(qint64 cpuTime)
+{
+    if (info.denom == 0)
+        mach_timebase_info(&info);
+    qint64 nsecs = cpuTime * info.numer / info.denom;
+    return nsecs;
+}
+
+void QPerformanceTimer::start()
+{
+    t1 = mach_absolute_time();
+}
+
+qint64 QPerformanceTimer::elapsed() const
+{
+    qint64 cpu_time = mach_absolute_time();
+    return absoluteToNSecs(cpu_time - t1);
+}
+
+// return number of nsecs elapsed from timer start time till absoluteMonotonicTimeNs
+// elapsedToAbsoluteTime(0) returns negative value of absolute time (ns) when the timer was started
+qint64 QPerformanceTimer::elapsedToAbsoluteTime(qint64 absoluteMonotonicTimeNs) const
+{
+    qint64 absolute_t1_ns = absoluteToNSecs(t1);
+    return absoluteMonotonicTimeNs - absolute_t1_ns;
+}
+
+////////////////////////////// Symbian //////////////////////////////
+#elif defined(Q_OS_SYMBIAN)
+
+static qint64 getTimeFromTick(quint64 elapsed)
+{
+    static TInt freq = 0;
+    if (!freq)
+        HAL::Get(HALData::EFastCounterFrequency, freq);
+
+    return (elapsed * 1000000000) / freq;
+}
+
+void QPerformanceTimer::start()
+{
+    t1 = User::FastCounter();
+}
+
+qint64 QPerformanceTimer::elapsed() const
+{
+    return getTimeFromTick(User::FastCounter() - t1);
+}
+
+
+qint64 QPerformanceTimer::elapsedToAbsoluteTime(qint64 absoluteMonotonicTimeNs) const
+{
+    qint64 absolute_t1_ns = getTimeFromTick(t1);
+    return absoluteMonotonicTimeNs - absolute_t1_ns;
+}
+
+////////////////////////////// Unix //////////////////////////////
+#elif defined(Q_OS_UNIX)
+
+#if defined(QT_NO_CLOCK_MONOTONIC) || defined(QT_BOOTSTRAPPED)
+// turn off the monotonic clock
+# ifdef _POSIX_MONOTONIC_CLOCK
+#  undef _POSIX_MONOTONIC_CLOCK
+# endif
+# define _POSIX_MONOTONIC_CLOCK -1
+#endif
+
+#if (_POSIX_MONOTONIC_CLOCK-0 != 0)
+static const bool monotonicClockChecked = true;
+static const bool monotonicClockAvailable = _POSIX_MONOTONIC_CLOCK > 0;
+#else
+static int monotonicClockChecked = false;
+static int monotonicClockAvailable = false;
+#endif
+
+#ifdef Q_CC_GNU
+# define is_likely(x) __builtin_expect((x), 1)
+#else
+# define is_likely(x) (x)
+#endif
+#define load_acquire(x) ((volatile const int&)(x))
+#define store_release(x,v) ((volatile int&)(x) = (v))
+
+static void unixCheckClockType()
+{
+#if (_POSIX_MONOTONIC_CLOCK-0 == 0)
+    if (is_likely(load_acquire(monotonicClockChecked)))
+        return;
+
+# if defined(_SC_MONOTONIC_CLOCK)
+    // detect if the system support monotonic timers
+    long x = sysconf(_SC_MONOTONIC_CLOCK);
+    store_release(monotonicClockAvailable, x >= 200112L);
+# endif
+
+    store_release(monotonicClockChecked, true);
+#endif
+}
+
+static inline void do_gettime(qint64 *sec, qint64 *frac)
+{
+#if (_POSIX_MONOTONIC_CLOCK-0 >= 0)
+    unixCheckClockType();
+    if (is_likely(monotonicClockAvailable)) {
+        timespec ts;
+        clock_gettime(CLOCK_MONOTONIC, &ts);
+        *sec = ts.tv_sec;
+        *frac = ts.tv_nsec;
+        return;
+    }
+#endif
+    *sec = 0;
+    *frac = 0;
+}
+
+void QPerformanceTimer::start()
+{
+    do_gettime(&t1, &t2);
+}
+
+qint64 QPerformanceTimer::elapsed() const
+{
+    qint64 sec, frac;
+    do_gettime(&sec, &frac);
+    sec = sec - t1;
+    frac = frac - t2;
+
+    return sec * Q_INT64_C(1000000000) + frac;
+}
+
+qint64 QPerformanceTimer::elapsedToAbsoluteTime(qint64 absoluteMonotonicTimeNs) const
+{
+    qint64 sec = absoluteMonotonicTimeNs / Q_INT64_C(1000000000);
+    qint64 frac = absoluteMonotonicTimeNs % Q_INT64_C(1000000000);
+    sec = sec - t1;
+    frac = frac - t2;
+
+    return sec * Q_INT64_C(1000000000) + frac;
+}
+
+////////////////////////////// Windows //////////////////////////////
+#elif defined(Q_OS_WIN)
+
+static qint64 getTimeFromTick(quint64 elapsed)
+{
+    static LARGE_INTEGER freq;
+    if (!freq.QuadPart)
+        QueryPerformanceFrequency(&freq);
+    return 1000000000 * elapsed / freq.QuadPart;
+}
+
+void QPerformanceTimer::start()
+{
+    LARGE_INTEGER li;
+    QueryPerformanceCounter(&li);
+    t1 = li.QuadPart;
+}
+
+qint64 QPerformanceTimer::elapsed() const
+{
+    LARGE_INTEGER li;
+    QueryPerformanceCounter(&li);
+    return getTimeFromTick(li.QuadPart - t1);
+}
+
+qint64 QPerformanceTimer::elapsedToAbsoluteTime(qint64 absoluteMonotonicTimeNs) const
+{
+    qint64 absolute_t1_ns = getTimeFromTick(t1);
+    return absoluteMonotonicTimeNs - absolute_t1_ns;
+}
+
+////////////////////////////// Default //////////////////////////////
+#else
+
+// default implementation (no hi-perf timer) does nothing
+void QPerformanceTimer::start()
+{
+}
+
+qint64 QPerformanceTimer::elapsed() const
+{
+    return 0;
+}
+
+qint64 QPerformanceTimer::elapsedToAbsoluteTime(qint64 absoluteMonotonicTimeNs) const
+{
+    Q_UNUSED(absoluteMonotonicTimeNs);
+    return 0;
+}
+
+#endif
+
+QT_END_NAMESPACE
+
+
diff --git a/src/declarative/qml/qperformancetimer_p.h b/src/declarative/qml/qperformancetimer_p.h
new file mode 100644
index 0000000000..23bde0f62a
--- /dev/null
+++ b/src/declarative/qml/qperformancetimer_p.h
@@ -0,0 +1,79 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtDeclarative 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 QPERFORMANCETIMER_P_H
+#define QPERFORMANCETIMER_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of moc.  This header file may change from version to version without notice,
+// or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qglobal.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class Q_DECLARATIVE_EXPORT QPerformanceTimer
+{
+public:
+    void start();
+    qint64 elapsed() const;
+    qint64 elapsedToAbsoluteTime(qint64 absoluteMonotonicTimeNs) const;
+private:
+    qint64 t1;
+    qint64 t2;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QPERFORMANCETIMER_P_H
diff --git a/tests/auto/declarative/declarative.pro b/tests/auto/declarative/declarative.pro
index c9486b0524..9cd2aa0eec 100644
--- a/tests/auto/declarative/declarative.pro
+++ b/tests/auto/declarative/declarative.pro
@@ -77,7 +77,8 @@ contains(QT_CONFIG, private_tests) {
            qdeclarativevisualdatamodel \
            qdeclarativeworkerscript \
            qdeclarativexmllistmodel \
-           qpacketprotocol
+           qpacketprotocol \
+           qperformancetimer
 }
 
 contains(QT_CONFIG, opengl): SUBDIRS += qmlshadersplugin
diff --git a/tests/auto/declarative/qperformancetimer/qperformancetimer.pro b/tests/auto/declarative/qperformancetimer/qperformancetimer.pro
new file mode 100644
index 0000000000..656bf686bd
--- /dev/null
+++ b/tests/auto/declarative/qperformancetimer/qperformancetimer.pro
@@ -0,0 +1,7 @@
+load(qttest_p4)
+contains(QT_CONFIG,declarative): QT += declarative
+SOURCES += tst_qperformancetimer.cpp
+macx:CONFIG -= app_bundle
+
+CONFIG += parallel_test
+
diff --git a/tests/auto/declarative/qperformancetimer/tst_qperformancetimer.cpp b/tests/auto/declarative/qperformancetimer/tst_qperformancetimer.cpp
new file mode 100644
index 0000000000..57004cc372
--- /dev/null
+++ b/tests/auto/declarative/qperformancetimer/tst_qperformancetimer.cpp
@@ -0,0 +1,80 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the test suite 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <private/qperformancetimer_p.h>
+#include <QObject>
+#include <qtest.h>
+
+class tst_qperformancetimer : public QObject
+{
+    Q_OBJECT
+
+public:
+    tst_qperformancetimer() {}
+
+private slots:
+    void units();
+};
+
+void tst_qperformancetimer::units()
+{
+    QPerformanceTimer timer;
+    timer.start();
+    {
+        QTest::qWait(300);
+        qint64 elapsed = timer.elapsed();
+        QVERIFY(elapsed > 300000000 && elapsed < 310000000);
+    }
+    {
+        timer.start();
+        qint64 monotonic_start = -timer.elapsedToAbsoluteTime(0);
+        qint64 wait_ms = 300;
+        QTest::qWait(wait_ms);
+        qint64 elapsed1 = timer.elapsed();
+        qint64 elapsed2 = timer.elapsedToAbsoluteTime(monotonic_start + elapsed1);
+        qint64 diff = elapsed1 - elapsed2;
+        QVERIFY(diff == 0);
+    }
+}
+
+QTEST_MAIN(tst_qperformancetimer)
+
+#include "tst_qperformancetimer.moc"
diff --git a/tests/benchmarks/declarative/qperformancetimer/qperformancetimer.pro b/tests/benchmarks/declarative/qperformancetimer/qperformancetimer.pro
new file mode 100644
index 0000000000..a39cd3d979
--- /dev/null
+++ b/tests/benchmarks/declarative/qperformancetimer/qperformancetimer.pro
@@ -0,0 +1,8 @@
+load(qttest_p4)
+QT += declarative
+TEMPLATE = app
+TARGET = tst_qperformancetimer
+macx:CONFIG -= app_bundle
+
+SOURCES += tst_qperformancetimer.cpp
+
diff --git a/tests/benchmarks/declarative/qperformancetimer/tst_qperformancetimer.cpp b/tests/benchmarks/declarative/qperformancetimer/tst_qperformancetimer.cpp
new file mode 100644
index 0000000000..587339a645
--- /dev/null
+++ b/tests/benchmarks/declarative/qperformancetimer/tst_qperformancetimer.cpp
@@ -0,0 +1,100 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the test suite 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <private/qperformancetimer_p.h>
+#include <QObject>
+#include <qtest.h>
+
+class tst_qperformancetimer : public QObject
+{
+    Q_OBJECT
+
+public:
+    tst_qperformancetimer() {}
+
+private slots:
+    void all();
+    void startElapsed();
+    void doubleElapsed();
+    void trace();
+};
+
+void tst_qperformancetimer::all()
+{
+    QBENCHMARK {
+        QPerformanceTimer t;
+        t.start();
+        t.elapsed();
+    }
+}
+
+void tst_qperformancetimer::startElapsed()
+{
+    QPerformanceTimer t;
+    QBENCHMARK {
+        t.start();
+        t.elapsed();
+    }
+}
+
+void tst_qperformancetimer::doubleElapsed()
+{
+    QPerformanceTimer t;
+    t.start();
+    QBENCHMARK {
+        t.elapsed();
+        t.elapsed();
+    }
+}
+
+void tst_qperformancetimer::trace()
+{
+    QString s("A decent sized string of text here.");
+    QBENCHMARK {
+        QByteArray data;
+        QDataStream ds(&data, QIODevice::WriteOnly);
+        ds << (qint64)100 << (int)5 << (int)5 << s;
+    }
+}
+
+QTEST_MAIN(tst_qperformancetimer)
+
+#include "tst_qperformancetimer.moc"