add an out of memory checker

3 files changed, 327 insertions, 0 deletions

diff --git a/tests/auto/exceptionsafety_objects/exceptionsafety_objects.pro b/tests/auto/exceptionsafety_objects/exceptionsafety_objects.pro
new file mode 100644
index 0000000000..413e1e3852
--- /dev/null
+++ b/tests/auto/exceptionsafety_objects/exceptionsafety_objects.pro
@@ -0,0 +1,3 @@
+load(qttest_p4)
+HEADERS += oomsimulator.h
+SOURCES += tst_exceptionsafety_objects.cpp
diff --git a/tests/auto/exceptionsafety_objects/oomsimulator.h b/tests/auto/exceptionsafety_objects/oomsimulator.h
new file mode 100644
index 0000000000..1b092ea932
--- /dev/null
+++ b/tests/auto/exceptionsafety_objects/oomsimulator.h
@@ -0,0 +1,175 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <malloc.h>
+
+/* Use glibc's memory allocation hooks */
+
+/* our hooks */
+static void *my_malloc_hook(size_t, const void *);
+static void *my_realloc_hook(void *, size_t, const void *);
+static void *my_memalign_hook(size_t, size_t, const void *);
+static void my_free_hook(void *, const void *);
+
+/* original hooks. */
+static void *(*old_malloc_hook)(size_t, const void *);
+static void *(*old_realloc_hook)(void *, size_t, const void *);
+static void *(*old_memalign_hook)(size_t, size_t, const void *);
+static void (*old_free_hook)(void *, const void *);
+
+/* initializer function */
+static void my_init_hook();
+
+/* Override initialising hook from the C library. */
+void (*__malloc_initialize_hook) (void) = my_init_hook;
+
+static void disableHooks()
+{
+    __malloc_hook = old_malloc_hook;
+    __realloc_hook = old_realloc_hook;
+    __memalign_hook = old_memalign_hook;
+    __free_hook = old_free_hook;
+}
+
+static void enableHooks()
+{
+    __malloc_hook = my_malloc_hook;
+    __realloc_hook = my_realloc_hook;
+    __memalign_hook = my_memalign_hook;
+    __free_hook = my_free_hook;
+}
+
+void my_init_hook()
+{
+    old_malloc_hook = __malloc_hook;
+    old_realloc_hook = __realloc_hook;
+    old_memalign_hook = __memalign_hook;
+    old_free_hook = __free_hook;
+    enableHooks();
+}
+
+static bool mallocFailActive = false;
+static int mallocFailIndex = 0;
+static int mallocCount = 0;
+static int freeCount = 0;
+
+struct AllocFailActivator
+{
+    inline AllocFailActivator() { mallocFailActive = true; }
+    inline ~AllocFailActivator() { mallocFailActive = false; }
+
+    inline void deactivate() { mallocFailActive = false; }
+};
+
+void *my_malloc_hook(size_t size, const void *)
+{
+    if (mallocFailActive && --mallocFailIndex < 0)
+        return 0; // simulate OOM
+
+    __malloc_hook = old_malloc_hook;
+    void *result = ::malloc (size);
+    __malloc_hook = my_malloc_hook;
+
+    ++mallocCount;
+    return result;
+}
+
+void *my_memalign_hook(size_t alignment, size_t size, const void *)
+{
+    if (mallocFailActive && --mallocFailIndex < 0)
+        return 0; // simulate OOM
+
+    __memalign_hook = old_memalign_hook;
+    void *result = ::memalign(alignment, size);
+    __memalign_hook = my_memalign_hook;
+
+    ++mallocCount;
+    return result;
+}
+
+void *my_realloc_hook(void *ptr, size_t size, const void *)
+{
+    if (mallocFailActive && --mallocFailIndex < 0)
+        return 0; // simulate OOM
+
+    __realloc_hook = old_realloc_hook;
+    __malloc_hook = old_malloc_hook;
+    void *result = ::realloc(ptr, size);
+    __malloc_hook = my_malloc_hook;
+    __realloc_hook = my_realloc_hook;
+
+    if (!ptr) // realloc on a 0 pointer equals a new allocation
+        ++mallocCount;
+    return result;
+}
+
+void my_free_hook(void *ptr, const void *)
+{
+    __free_hook = old_free_hook;
+    ::free(ptr);
+    __free_hook = my_free_hook;
+
+    ++freeCount;
+}
+
+static void *new_helper(std::size_t size)
+{
+    void *ptr = malloc(size);
+    if (!ptr)
+        throw std::bad_alloc();
+    return ptr;
+}
+
+// overload operator new
+void* operator new(size_t size) throw (std::bad_alloc) { return new_helper(size); }
+void* operator new[](size_t size) throw (std::bad_alloc) { return new_helper(size); }
+void* operator new(size_t size, const std::nothrow_t&) throw() { return malloc(size); }
+void* operator new[](std::size_t size, const std::nothrow_t&) throw() { return malloc(size); }
+
+// overload operator delete
+void operator delete(void *ptr) throw() { if (ptr) free(ptr); }
+void operator delete[](void *ptr) throw() { if (ptr) free(ptr); }
+void operator delete(void *ptr, const std::nothrow_t&) throw() { if (ptr) free(ptr); }
+void operator delete[](void *ptr, const std::nothrow_t&) throw() { if (ptr) free (ptr); }
+
+// ignore placement new and placement delete - those don't allocate.
+
+
diff --git a/tests/auto/exceptionsafety_objects/tst_exceptionsafety_objects.cpp b/tests/auto/exceptionsafety_objects/tst_exceptionsafety_objects.cpp
new file mode 100644
index 0000000000..31c8f0a9ce
--- /dev/null
+++ b/tests/auto/exceptionsafety_objects/tst_exceptionsafety_objects.cpp
@@ -0,0 +1,149 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui/QtGui>
+#include <QtTest/QtTest>
+
+QT_USE_NAMESPACE
+
+// this test only works with GLIBC (let moc run regardless, because it doesn't know about __GLIBC__)
+#if defined(QT_NO_EXCEPTIONS) || (!defined(__GLIBC__) && !defined(Q_MOC_RUN))
+    QTEST_NOOP_MAIN
+#else
+
+#include "oomsimulator.h"
+
+class tst_ExceptionSafetyObjects: public QObject
+{
+    Q_OBJECT
+
+public slots:
+    void initTestCase();
+
+private slots:
+    void widgets_data();
+    void widgets();
+};
+
+void tst_ExceptionSafetyObjects::initTestCase()
+{
+}
+
+// helper structs to create an arbitrary widget
+struct AbstractWidgetCreator
+{
+    virtual QWidget *create(QWidget *parent) = 0;
+};
+
+Q_DECLARE_METATYPE(AbstractWidgetCreator *)
+
+template <typename T>
+struct WidgetCreator : public AbstractWidgetCreator
+{
+    QWidget *create(QWidget *parent)
+    {
+        return parent ? new T(parent) : new T;
+    }
+};
+
+void tst_ExceptionSafetyObjects::widgets_data()
+{
+    QTest::addColumn<AbstractWidgetCreator *>("widgetCreator");
+
+#define NEWROW(T) QTest::newRow(#T) << static_cast<AbstractWidgetCreator *>(new WidgetCreator<T >)
+    NEWROW(QWidget);
+    NEWROW(QPushButton);
+    NEWROW(QLabel);
+}
+
+void tst_ExceptionSafetyObjects::widgets()
+{
+    QFETCH(AbstractWidgetCreator *, widgetCreator);
+
+    mallocCount = freeCount = 0;
+
+    int currentOOMIndex = 0;
+
+    // activate mallocFail - WE'RE HOT!
+    AllocFailActivator allocFailActivator;
+
+    do {
+        // start after first alloc (the first alloc is creation of the widget itself)
+        mallocFailIndex = ++currentOOMIndex;
+
+        // first, create without a parent
+        try {
+            QScopedPointer<QWidget> ptr(widgetCreator->create(0));
+            // QScopedPointer deletes the widget again here.
+        } catch (const std::bad_alloc &) {
+            // ignore all std::bad_alloc - note: valgrind should show no leaks
+        }
+
+        // repeat the loop until we the malloc fail index indicates that
+        // there was no OOM simulation happening
+    } while (mallocFailIndex <= 0);
+
+    // reset counting
+    currentOOMIndex = 0;
+
+    do {
+        mallocFailIndex = ++currentOOMIndex;
+
+        // create the widget with a parent
+        try {
+            QWidget parent;
+            widgetCreator->create(&parent);
+            // parent goes out of scope - widget should be deleted as well
+        } catch (const std::bad_alloc &) {
+        }
+    } while (mallocFailIndex <= 0);
+
+#ifdef VERBOSE
+    allocFailActivator.deactivate();
+
+    qDebug() << "mallocCount" << mallocCount << "freeCount" << freeCount <<
+                "simulated alloc fails" << currentOOMIndex;
+#endif
+}
+
+QTEST_MAIN(tst_ExceptionSafetyObjects)
+#include "tst_exceptionsafety_objects.moc"
+#endif // QT_NO_EXCEPTIONS