tst_QList: test all memory layouts

The Movable type, surprisingly, was as large as sizeof(void*), so on
32-bit platforms, we were not testing the QList memory layout where
items are placed directly into the void*-slots, but are too small,
leaving gaps.

Fixed by making sure that Movable is smaller than void* and adding
a variant of Movable, Optimal, that is guaranteed to be the same
size as void*, and replacing the int tests with tests of Optimal.

Had to demote the State variable to uchar, since MSVC will apparently
not make a collection of bit-fields smaller than the largest type used
in any of the consituent bitfields, so State s : 8 wouldn't work.

Change-Id: I4f0e24bd6928f076b4ce60e8d977d5d98a724161
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 226 insertions, 93 deletions

diff --git a/tests/auto/corelib/tools/qlist/tst_qlist.cpp b/tests/auto/corelib/tools/qlist/tst_qlist.cpp
index 1e7b3ee2d6..95744051e4 100644
--- a/tests/auto/corelib/tools/qlist/tst_qlist.cpp
+++ b/tests/auto/corelib/tools/qlist/tst_qlist.cpp
@@ -79,14 +79,16 @@ private:
     static int liveCount;
 
     enum State { Constructed = 106, Destructed = 110 };
-    State state;
+    uchar state;
 
-    static void check(const State state1, const State state2)
+    static void check(const uchar state1, const uchar state2)
     {
         QCOMPARE(state1, state2);
     }
 };
 
+Q_STATIC_ASSERT(sizeof(Movable) < sizeof(void*));
+
 int Movable::liveCount = 0;
 
 QT_BEGIN_NAMESPACE
@@ -100,6 +102,75 @@ int qHash(const Movable& movable)
     return qHash(movable.i);
 }
 
+struct Optimal
+{
+    Optimal(char input = 'j')
+        : i(input),
+          state(Constructed)
+    {
+        ++liveCount;
+    }
+    Optimal(const Optimal &other)
+        : i(other.i),
+          state(Constructed)
+    {
+        check(other.state, Constructed);
+        ++liveCount;
+    }
+
+    ~Optimal()
+    {
+        check(state, Constructed);
+        i = 0;
+        --liveCount;
+        state = Destructed;
+    }
+
+    bool operator ==(const Optimal &other) const
+    {
+        check(state, Constructed);
+        check(other.state, Constructed);
+        return i == other.i;
+    }
+
+    Optimal &operator=(const Optimal &other)
+    {
+        check(state, Constructed);
+        check(other.state, Constructed);
+        i = other.i;
+        return *this;
+    }
+    char i;
+
+    static int getLiveCount() { return liveCount; }
+private:
+    static int liveCount;
+
+    enum State { Constructed = 106, Destructed = 110 };
+    uchar state;
+    char padding[sizeof(void*) - 2];
+
+    static void check(const uchar state1, const uchar state2)
+    {
+        QCOMPARE(state1, state2);
+    }
+};
+
+Q_STATIC_ASSERT(sizeof(Optimal) == sizeof(void*));
+
+int Optimal::liveCount = 0;
+
+QT_BEGIN_NAMESPACE
+Q_DECLARE_TYPEINFO(Optimal, Q_MOVABLE_TYPE);
+QT_END_NAMESPACE
+
+Q_DECLARE_METATYPE(Optimal);
+
+int qHash(const Optimal& key)
+{
+    return qHash(key.i);
+}
+
 struct Complex
 {
     Complex(int val = 0)
@@ -160,6 +231,8 @@ Q_STATIC_ASSERT(!QTypeInfo<int>::isStatic);
 Q_STATIC_ASSERT(!QTypeInfo<int>::isComplex);
 Q_STATIC_ASSERT(!QTypeInfo<Movable>::isStatic);
 Q_STATIC_ASSERT(QTypeInfo<Movable>::isComplex);
+Q_STATIC_ASSERT(!QTypeInfo<Optimal>::isStatic);
+Q_STATIC_ASSERT(QTypeInfo<Optimal>::isComplex);
 Q_STATIC_ASSERT(QTypeInfo<Complex>::isStatic);
 Q_STATIC_ASSERT(QTypeInfo<Complex>::isComplex);
 
@@ -168,100 +241,100 @@ class tst_QList : public QObject
     Q_OBJECT
 
 private slots:
-    void lengthInt() const;
+    void lengthOptimal() const;
     void lengthMovable() const;
     void lengthComplex() const;
     void lengthSignature() const;
-    void appendInt() const;
+    void appendOptimal() const;
     void appendMovable() const;
     void appendComplex() const;
     void prepend() const;
-    void midInt() const;
+    void midOptimal() const;
     void midMovable() const;
     void midComplex() const;
-    void atInt() const;
+    void atOptimal() const;
     void atMovable() const;
     void atComplex() const;
-    void firstInt() const;
+    void firstOptimal() const;
     void firstMovable() const;
     void firstComplex() const;
-    void lastInt() const;
+    void lastOptimal() const;
     void lastMovable() const;
     void lastComplex() const;
-    void beginInt() const;
+    void beginOptimal() const;
     void beginMovable() const;
     void beginComplex() const;
-    void endInt() const;
+    void endOptimal() const;
     void endMovable() const;
     void endComplex() const;
-    void containsInt() const;
+    void containsOptimal() const;
     void containsMovable() const;
     void containsComplex() const;
-    void countInt() const;
+    void countOptimal() const;
     void countMovable() const;
     void countComplex() const;
-    void emptyInt() const;
+    void emptyOptimal() const;
     void emptyMovable() const;
     void emptyComplex() const;
-    void endsWithInt() const;
+    void endsWithOptimal() const;
     void endsWithMovable() const;
     void endsWithComplex() const;
-    void lastIndexOfInt() const;
+    void lastIndexOfOptimal() const;
     void lastIndexOfMovable() const;
     void lastIndexOfComplex() const;
-    void moveInt() const;
+    void moveOptimal() const;
     void moveMovable() const;
     void moveComplex() const;
-    void removeAllInt() const;
+    void removeAllOptimal() const;
     void removeAllMovable() const;
     void removeAllComplex() const;
-    void removeAtInt() const;
+    void removeAtOptimal() const;
     void removeAtMovable() const;
     void removeAtComplex() const;
-    void removeOneInt() const;
+    void removeOneOptimal() const;
     void removeOneMovable() const;
     void removeOneComplex() const;
-    void replaceInt() const;
+    void replaceOptimal() const;
     void replaceMovable() const;
     void replaceComplex() const;
-    void startsWithInt() const;
+    void startsWithOptimal() const;
     void startsWithMovable() const;
     void startsWithComplex() const;
-    void swapInt() const;
+    void swapOptimal() const;
     void swapMovable() const;
     void swapComplex() const;
-    void takeAtInt() const;
+    void takeAtOptimal() const;
     void takeAtMovable() const;
     void takeAtComplex() const;
-    void takeFirstInt() const;
+    void takeFirstOptimal() const;
     void takeFirstMovable() const;
     void takeFirstComplex() const;
-    void takeLastInt() const;
+    void takeLastOptimal() const;
     void takeLastMovable() const;
     void takeLastComplex() const;
-    void toSetInt() const;
+    void toSetOptimal() const;
     void toSetMovable() const;
     void toSetComplex() const;
-    void toStdListInt() const;
+    void toStdListOptimal() const;
     void toStdListMovable() const;
     void toStdListComplex() const;
-    void toVectorInt() const;
+    void toVectorOptimal() const;
     void toVectorMovable() const;
     void toVectorComplex() const;
-    void valueInt() const;
+    void valueOptimal() const;
     void valueMovable() const;
     void valueComplex() const;
 
-    void testOperatorsInt() const;
+    void testOperatorsOptimal() const;
     void testOperatorsMovable() const;
     void testOperatorsComplex() const;
-    void testSTLIteratorsInt() const;
+    void testSTLIteratorsOptimal() const;
     void testSTLIteratorsMovable() const;
     void testSTLIteratorsComplex() const;
 
     void initializeList() const;
 
-    void constSharedNullInt() const;
+    void constSharedNullOptimal() const;
     void constSharedNullMovable() const;
     void constSharedNullComplex() const;
     void setSharableInt_data() const;
@@ -320,7 +393,7 @@ template<typename T> struct SimpleValue
 };
 
 template<>
-const int SimpleValue<int>::values[] = { 10, 20, 30, 40, 100, 101, 102 };
+const Optimal SimpleValue<Optimal>::values[] = { 10, 20, 30, 40, 100, 101, 102 };
 template<>
 const Movable SimpleValue<Movable>::values[] = { 10, 20, 30, 40, 100, 101, 102 };
 template<>
@@ -369,9 +442,11 @@ void tst_QList::length() const
     }
 }
 
-void tst_QList::lengthInt() const
+void tst_QList::lengthOptimal() const
 {
-    length<int>();
+    const int liveCount = Optimal::getLiveCount();
+    length<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::lengthMovable() const
@@ -421,9 +496,11 @@ void tst_QList::append() const
     QCOMPARE(list1, listTotal);
 }
 
-void tst_QList::appendInt() const
+void tst_QList::appendOptimal() const
 {
-    append<int>();
+    const int liveCount = Optimal::getLiveCount();
+    append<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::appendMovable() const
@@ -486,9 +563,11 @@ void tst_QList::mid() const
     QCOMPARE(list1.mid(1, 1).length(), 0);
 }
 
-void tst_QList::midInt() const
+void tst_QList::midOptimal() const
 {
-    mid<int>();
+    const int liveCount = Optimal::getLiveCount();
+    mid<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::midMovable() const
@@ -534,9 +613,11 @@ void tst_QList::at() const
     QCOMPARE(list.at(2), T_CAT);
 }
 
-void tst_QList::atInt() const
+void tst_QList::atOptimal() const
 {
-    at<int>();
+    const int liveCount = Optimal::getLiveCount();
+    at<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::atMovable() const
@@ -567,9 +648,11 @@ void tst_QList::first() const
     QCOMPARE(list.first(), T_BAR);
 }
 
-void tst_QList::firstInt() const
+void tst_QList::firstOptimal() const
 {
-    first<int>();
+    const int liveCount = Optimal::getLiveCount();
+    first<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::firstMovable() const
@@ -600,9 +683,11 @@ void tst_QList::last() const
     QCOMPARE(list.last(), T_FOO);
 }
 
-void tst_QList::lastInt() const
+void tst_QList::lastOptimal() const
 {
-    last<int>();
+    const int liveCount = Optimal::getLiveCount();
+    last<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::lastMovable() const
@@ -633,9 +718,11 @@ void tst_QList::begin() const
     QCOMPARE(*list.begin(), T_BAR);
 }
 
-void tst_QList::beginInt() const
+void tst_QList::beginOptimal() const
 {
-    begin<int>();
+    const int liveCount = Optimal::getLiveCount();
+    begin<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::beginMovable() const
@@ -666,9 +753,11 @@ void tst_QList::end() const
     QCOMPARE(*--list.end(), T_FOO);
 }
 
-void tst_QList::endInt() const
+void tst_QList::endOptimal() const
 {
-    end<int>();
+    const int liveCount = Optimal::getLiveCount();
+    end<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::endMovable() const
@@ -699,9 +788,11 @@ void tst_QList::contains() const
     QVERIFY(list.contains(T_BLAH) == true);
 }
 
-void tst_QList::containsInt() const
+void tst_QList::containsOptimal() const
 {
-    contains<int>();
+    const int liveCount = Optimal::getLiveCount();
+    contains<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::containsMovable() const
@@ -743,9 +834,11 @@ void tst_QList::count() const
     QVERIFY(list.count() == 0);
 }
 
-void tst_QList::countInt() const
+void tst_QList::countOptimal() const
 {
-    count<int>();
+    const int liveCount = Optimal::getLiveCount();
+    count<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::countMovable() const
@@ -779,9 +872,11 @@ void tst_QList::empty() const
     QVERIFY(list.empty());
 }
 
-void tst_QList::emptyInt() const
+void tst_QList::emptyOptimal() const
 {
-    empty<int>();
+    const int liveCount = Optimal::getLiveCount();
+    empty<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::emptyMovable() const
@@ -813,9 +908,11 @@ void tst_QList::endsWith() const
     QVERIFY(list.endsWith(T_BAR));
 }
 
-void tst_QList::endsWithInt() const
+void tst_QList::endsWithOptimal() const
 {
-    endsWith<int>();
+    const int liveCount = Optimal::getLiveCount();
+    endsWith<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::endsWithMovable() const
@@ -856,9 +953,11 @@ void tst_QList::lastIndexOf() const
     QVERIFY(list.lastIndexOf(T_BAZ, 1) == -1);
 }
 
-void tst_QList::lastIndexOfInt() const
+void tst_QList::lastIndexOfOptimal() const
 {
-    lastIndexOf<int>();
+    const int liveCount = Optimal::getLiveCount();
+    lastIndexOf<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::lastIndexOfMovable() const
@@ -894,9 +993,11 @@ void tst_QList::move() const
     QCOMPARE(list, QList<T>() << T_BAR << T_FOO << T_BAZ);
 }
 
-void tst_QList::moveInt() const
+void tst_QList::moveOptimal() const
 {
-    move<int>();
+    const int liveCount = Optimal::getLiveCount();
+    move<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::moveMovable() const
@@ -933,9 +1034,11 @@ void tst_QList::removeAll() const
     QCOMPARE(list, QList<T>() << T_FOO << T_BAZ << T_FOO << T_BAZ << T_FOO << T_BAZ << T_FOO << T_BAZ);
 }
 
-void tst_QList::removeAllInt() const
+void tst_QList::removeAllOptimal() const
 {
-    removeAll<int>();
+    const int liveCount = Optimal::getLiveCount();
+    removeAll<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::removeAllMovable() const
@@ -971,9 +1074,11 @@ void tst_QList::removeAt() const
     QCOMPARE(list, QList<T>());
 }
 
-void tst_QList::removeAtInt() const
+void tst_QList::removeAtOptimal() const
 {
-    removeAt<int>();
+    const int liveCount = Optimal::getLiveCount();
+    removeAt<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::removeAtMovable() const
@@ -1018,9 +1123,11 @@ void tst_QList::removeOne() const
     QCOMPARE(list, QList<T>() << T_FOO);
 }
 
-void tst_QList::removeOneInt() const
+void tst_QList::removeOneOptimal() const
 {
-    removeOne<int>();
+    const int liveCount = Optimal::getLiveCount();
+    removeOne<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::removeOneMovable() const
@@ -1059,9 +1166,11 @@ void tst_QList::replace() const
         << T_DOG << T_BLAH);
 }
 
-void tst_QList::replaceInt() const
+void tst_QList::replaceOptimal() const
 {
-    replace<int>();
+    const int liveCount = Optimal::getLiveCount();
+    replace<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::replaceMovable() const
@@ -1092,9 +1201,11 @@ void tst_QList::startsWith() const
     QVERIFY(list.startsWith(T_BAR));
 }
 
-void tst_QList::startsWithInt() const
+void tst_QList::startsWithOptimal() const
 {
-    startsWith<int>();
+    const int liveCount = Optimal::getLiveCount();
+    startsWith<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::startsWithMovable() const
@@ -1133,9 +1244,11 @@ void tst_QList::swap() const
     QCOMPARE(list2, QList<T>() << T_BAZ << T_FOO << T_BAR);
 }
 
-void tst_QList::swapInt() const
+void tst_QList::swapOptimal() const
 {
-    swap<int>();
+    const int liveCount = Optimal::getLiveCount();
+    swap<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::swapMovable() const
@@ -1166,9 +1279,11 @@ void tst_QList::takeAt() const
     QVERIFY(list.size() == 0);
 }
 
-void tst_QList::takeAtInt() const
+void tst_QList::takeAtOptimal() const
 {
-    takeAt<int>();
+    const int liveCount = Optimal::getLiveCount();
+    takeAt<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::takeAtMovable() const
@@ -1199,9 +1314,11 @@ void tst_QList::takeFirst() const
     QVERIFY(list.size() == 0);
 }
 
-void tst_QList::takeFirstInt() const
+void tst_QList::takeFirstOptimal() const
 {
-    takeFirst<int>();
+    const int liveCount = Optimal::getLiveCount();
+    takeFirst<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::takeFirstMovable() const
@@ -1229,9 +1346,11 @@ void tst_QList::takeLast() const
     QCOMPARE(list.takeLast(), T_FOO);
 }
 
-void tst_QList::takeLastInt() const
+void tst_QList::takeLastOptimal() const
 {
-    takeLast<int>();
+    const int liveCount = Optimal::getLiveCount();
+    takeLast<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::takeLastMovable() const
@@ -1265,9 +1384,11 @@ void tst_QList::toSet() const
         << T_FOO << T_BAR << T_BAZ);
 }
 
-void tst_QList::toSetInt() const
+void tst_QList::toSetOptimal() const
 {
-    toSet<int>();
+    const int liveCount = Optimal::getLiveCount();
+    toSet<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::toSetMovable() const
@@ -1300,9 +1421,11 @@ void tst_QList::toStdList() const
     QCOMPARE(list, QList<T>() << T_FOO << T_BAR << T_BAZ);
 }
 
-void tst_QList::toStdListInt() const
+void tst_QList::toStdListOptimal() const
 {
-    toStdList<int>();
+    const int liveCount = Optimal::getLiveCount();
+    toStdList<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::toStdListMovable() const
@@ -1328,9 +1451,11 @@ void tst_QList::toVector() const
     QCOMPARE(list.toVector(), QVector<T>() << T_FOO << T_BAR << T_BAZ);
 }
 
-void tst_QList::toVectorInt() const
+void tst_QList::toVectorOptimal() const
 {
-    toVector<int>();
+    const int liveCount = Optimal::getLiveCount();
+    toVector<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::toVectorMovable() const
@@ -1367,9 +1492,11 @@ void tst_QList::value() const
     QCOMPARE(list.value(3, defaultT), defaultT);
 }
 
-void tst_QList::valueInt() const
+void tst_QList::valueOptimal() const
 {
-    value<int>();
+    const int liveCount = Optimal::getLiveCount();
+    value<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::valueMovable() const
@@ -1419,9 +1546,11 @@ void tst_QList::testOperators() const
     QCOMPARE(list[list.size() - 1], T_CAT);
 }
 
-void tst_QList::testOperatorsInt() const
+void tst_QList::testOperatorsOptimal() const
 {
-    testOperators<int>();
+    const int liveCount = Optimal::getLiveCount();
+    testOperators<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::testOperatorsMovable() const
@@ -1478,9 +1607,11 @@ void tst_QList::testSTLIterators() const
     QCOMPARE(*it, T_FOO);
 }
 
-void tst_QList::testSTLIteratorsInt() const
+void tst_QList::testSTLIteratorsOptimal() const
 {
-    testSTLIterators<int>();
+    const int liveCount = Optimal::getLiveCount();
+    testSTLIterators<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::testSTLIteratorsMovable() const
@@ -1525,9 +1656,11 @@ void tst_QList::constSharedNull() const
     QVERIFY(!list2.isDetached());
 }
 
-void tst_QList::constSharedNullInt() const
+void tst_QList::constSharedNullOptimal() const
 {
-    constSharedNull<int>();
+    const int liveCount = Optimal::getLiveCount();
+    constSharedNull<Optimal>();
+    QCOMPARE(liveCount, Optimal::getLiveCount());
 }
 
 void tst_QList::constSharedNullMovable() const