Add benchmarks for QMetaType::construct(int type, void *copy = 0)

Tests all built-in (core and GUI) types, both default construction
(copy == 0) and copy construction.

The benchmarks for GUI types must go into a separate file because
core tests don't (and shouldn't) link against QtGui.

Reviewed-by: Benjamin Poulain

2 files changed, 119 insertions, 0 deletions

diff --git a/tests/benchmarks/gui/kernel/qguimetatype/qguimetatype.pro b/tests/benchmarks/gui/kernel/qguimetatype/qguimetatype.pro
new file mode 100644
index 0000000..7ef99e4
--- /dev/null
+++ b/tests/benchmarks/gui/kernel/qguimetatype/qguimetatype.pro
@@ -0,0 +1,6 @@
+load(qttest_p4)
+TEMPLATE = app
+TARGET = tst_bench_qguimetatype
+
+SOURCES += tst_qguimetatype.cpp
+
diff --git a/tests/benchmarks/gui/kernel/qguimetatype/tst_qguimetatype.cpp b/tests/benchmarks/gui/kernel/qguimetatype/tst_qguimetatype.cpp
new file mode 100644
index 0000000..f94767b
--- /dev/null
+++ b/tests/benchmarks/gui/kernel/qguimetatype/tst_qguimetatype.cpp
@@ -0,0 +1,113 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <qtest.h>
+#include <QtCore/qmetatype.h>
+
+class tst_QGuiMetaType : public QObject
+{
+    Q_OBJECT
+
+public:
+    tst_QGuiMetaType();
+    virtual ~tst_QGuiMetaType();
+
+private slots:
+    void constructGuiType_data();
+    void constructGuiType();
+    void constructGuiTypeCopy_data();
+    void constructGuiTypeCopy();
+};
+
+tst_QGuiMetaType::tst_QGuiMetaType()
+{
+}
+
+tst_QGuiMetaType::~tst_QGuiMetaType()
+{
+}
+
+void tst_QGuiMetaType::constructGuiType_data()
+{
+    QTest::addColumn<int>("typeId");
+    for (int i = QMetaType::FirstGuiType; i <= QMetaType::LastGuiType; ++i)
+        QTest::newRow(QMetaType::typeName(i)) << i;
+}
+
+// Tests how fast QMetaType can default-construct and destroy a Qt GUI
+// type. The purpose of this benchmark is to measure the overhead of
+// using type id-based creation compared to creating the type directly
+// (i.e. "T *t = new T(); delete t;").
+void tst_QGuiMetaType::constructGuiType()
+{
+    QFETCH(int, typeId);
+    QBENCHMARK {
+        for (int i = 0; i < 100000; ++i) {
+            void *data = QMetaType::construct(typeId, (void *)0);
+            QMetaType::destroy(typeId, data);
+        }
+    }
+}
+
+void tst_QGuiMetaType::constructGuiTypeCopy_data()
+{
+    constructGuiType_data();
+}
+
+// Tests how fast QMetaType can copy-construct and destroy a Qt GUI
+// type. The purpose of this benchmark is to measure the overhead of
+// using type id-based creation compared to creating the type directly
+// (i.e. "T *t = new T(other); delete t;").
+void tst_QGuiMetaType::constructGuiTypeCopy()
+{
+    QFETCH(int, typeId);
+    QVariant other(typeId, (void *)0);
+    const void *copy = other.constData();
+    QBENCHMARK {
+        for (int i = 0; i < 100000; ++i) {
+            void *data = QMetaType::construct(typeId, copy);
+            QMetaType::destroy(typeId, data);
+        }
+    }
+}
+
+QTEST_MAIN(tst_QGuiMetaType)
+#include "tst_qguimetatype.moc"