qmetaobject.cpp

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#include "qmetaobject.h"
#include "qmetatype.h"
#include "qobject.h"

#include <qcoreapplication.h>
#include <qcoreevent.h>
#include <qdatastream.h>
#include <qstringlist.h>
#include <qthread.h>
#include <qvarlengtharray.h>
#include <qvariant.h>
#include <qhash.h>
#include <qdebug.h>
#include <qsemaphore.h>

#include "private/qobject_p.h"
#include "private/qmetaobject_p.h"

#include <ctype.h>

QT_BEGIN_NAMESPACE

static inline const QMetaObjectPrivate *priv(const uint* data)
{ return reinterpret_cast<const QMetaObjectPrivate*>(data); }


QObject *QMetaObject::newInstance(QGenericArgument val0,
                                  QGenericArgument val1,
                                  QGenericArgument val2,
                                  QGenericArgument val3,
                                  QGenericArgument val4,
                                  QGenericArgument val5,
                                  QGenericArgument val6,
                                  QGenericArgument val7,
                                  QGenericArgument val8,
                                  QGenericArgument val9) const
{
    QByteArray constructorName = className();
    {
        int idx = constructorName.lastIndexOf(':');
        if (idx != -1)
            constructorName.remove(0, idx+1); // remove qualified part
    }
    QVarLengthArray<char, 512> sig;
    sig.append(constructorName.constData(), constructorName.length());
    sig.append('(');

    enum { MaximumParamCount = 10 };
    const char *typeNames[] = {val0.name(), val1.name(), val2.name(), val3.name(), val4.name(),
                               val5.name(), val6.name(), val7.name(), val8.name(), val9.name()};

    int paramCount;
    for (paramCount = 0; paramCount < MaximumParamCount; ++paramCount) {
        int len = qstrlen(typeNames[paramCount]);
        if (len <= 0)
            break;
        sig.append(typeNames[paramCount], len);
        sig.append(',');
    }
    if (paramCount == 0)
        sig.append(')'); // no parameters
    else
        sig[sig.size() - 1] = ')';
    sig.append('\0');

    int idx = indexOfConstructor(sig.constData());
    if (idx < 0) {
        QByteArray norm = QMetaObject::normalizedSignature(sig.constData());
        idx = indexOfConstructor(norm.constData());
    }
    if (idx < 0)
        return 0;

    QVariant ret(QMetaType::QObjectStar, (void*)0);
    void *param[] = {ret.data(), val0.data(), val1.data(), val2.data(), val3.data(), val4.data(),
                     val5.data(), val6.data(), val7.data(), val8.data(), val9.data()};

    if (static_metacall(CreateInstance, idx, param) >= 0)
        return 0;
    return *reinterpret_cast<QObject**>(param[0]);
}

int QMetaObject::static_metacall(Call cl, int idx, void **argv) const
{
    const QMetaObjectExtraData *extra = reinterpret_cast<const QMetaObjectExtraData *>(d.extradata);
    if (priv(d.data)->revision >= 6) {
        if (!extra || !extra->static_metacall)
            return 0;
        extra->static_metacall(0, cl, idx, argv);
        return -1;
    } else if (priv(d.data)->revision >= 2) {
        if (!extra || !extra->static_metacall)
            return 0;
        typedef int (*OldMetacall)(QMetaObject::Call, int, void **);
        OldMetacall o = reinterpret_cast<OldMetacall>(extra->static_metacall);
        return o(cl, idx, argv);
    }
    return 0;
}

int QMetaObject::metacall(QObject *object, Call cl, int idx, void **argv)
{
    if (QMetaObject *mo = object->d_ptr->metaObject)
        return static_cast<QAbstractDynamicMetaObject*>(mo)->metaCall(cl, idx, argv);
    else
        return object->qt_metacall(cl, idx, argv);
}

QObject *QMetaObject::cast(QObject *obj) const
{
    if (obj) {
        const QMetaObject *m = obj->metaObject();
        do {
            if (m == this)
                return obj;
        } while ((m = m->d.superdata));
    }
    return 0;
}

const QObject *QMetaObject::cast(const QObject *obj) const
{
    if (obj) {
        const QMetaObject *m = obj->metaObject();
        do {
            if (m == this)
                return obj;
        } while ((m = m->d.superdata));
    }
    return 0;
}

#ifndef QT_NO_TRANSLATION

QString QMetaObject::tr(const char *s, const char *c) const
{
    return QCoreApplication::translate(d.stringdata, s, c, QCoreApplication::CodecForTr);
}

QString QMetaObject::tr(const char *s, const char *c, int n) const
{
    return QCoreApplication::translate(d.stringdata, s, c, QCoreApplication::CodecForTr, n);
}

QString QMetaObject::trUtf8(const char *s, const char *c) const
{
    return QCoreApplication::translate(d.stringdata, s, c, QCoreApplication::UnicodeUTF8);
}

QString QMetaObject::trUtf8(const char *s, const char *c, int n) const
{
    return QCoreApplication::translate(d.stringdata, s, c, QCoreApplication::UnicodeUTF8, n);
}
#endif // QT_NO_TRANSLATION

int QMetaObject::methodOffset() const
{
    int offset = 0;
    const QMetaObject *m = d.superdata;
    while (m) {
        offset += priv(m->d.data)->methodCount;
        m = m->d.superdata;
    }
    return offset;
}


int QMetaObject::enumeratorOffset() const
{
    int offset = 0;
    const QMetaObject *m = d.superdata;
    while (m) {
        offset += priv(m->d.data)->enumeratorCount;
        m = m->d.superdata;
    }
    return offset;
}

int QMetaObject::propertyOffset() const
{
    int offset = 0;
    const QMetaObject *m = d.superdata;
    while (m) {
        offset += priv(m->d.data)->propertyCount;
        m = m->d.superdata;
    }
    return offset;
}

int QMetaObject::classInfoOffset() const
{
    int offset = 0;
    const QMetaObject *m = d.superdata;
    while (m) {
        offset += priv(m->d.data)->classInfoCount;
        m = m->d.superdata;
    }
    return offset;
}

int QMetaObject::constructorCount() const
{
    if (priv(d.data)->revision < 2)
        return 0;
    return priv(d.data)->constructorCount;
}

int QMetaObject::methodCount() const
{
    int n = priv(d.data)->methodCount;
    const QMetaObject *m = d.superdata;
    while (m) {
        n += priv(m->d.data)->methodCount;
        m = m->d.superdata;
    }
    return n;
}

int QMetaObject::enumeratorCount() const
{
    int n = priv(d.data)->enumeratorCount;
    const QMetaObject *m = d.superdata;
    while (m) {
        n += priv(m->d.data)->enumeratorCount;
        m = m->d.superdata;
    }
    return n;
}

int QMetaObject::propertyCount() const
{
    int n = priv(d.data)->propertyCount;
    const QMetaObject *m = d.superdata;
    while (m) {
        n += priv(m->d.data)->propertyCount;
        m = m->d.superdata;
    }
    return n;
}

int QMetaObject::classInfoCount() const
{
    int n = priv(d.data)->classInfoCount;
    const QMetaObject *m = d.superdata;
    while (m) {
        n += priv(m->d.data)->classInfoCount;
        m = m->d.superdata;
    }
    return n;
}

template<int MethodType>
static inline int indexOfMethodRelative(const QMetaObject **baseObject,
                                        const char *method,
                                        bool normalizeStringData)
{
    for (const QMetaObject *m = *baseObject; m; m = m->d.superdata) {
        int i = (MethodType == MethodSignal && priv(m->d.data)->revision >= 4)
                ? (priv(m->d.data)->signalCount - 1) : (priv(m->d.data)->methodCount - 1);
        const int end = (MethodType == MethodSlot && priv(m->d.data)->revision >= 4)
                        ? (priv(m->d.data)->signalCount) : 0;
        if (!normalizeStringData) {
            for (; i >= end; --i) {
                const char *stringdata = m->d.stringdata + m->d.data[priv(m->d.data)->methodData + 5*i];
                if (method[0] == stringdata[0] && strcmp(method + 1, stringdata + 1) == 0) {
                    *baseObject = m;
                    return i;
                }
            }
        } else if (priv(m->d.data)->revision < 5) {
            for (; i >= end; --i) {
                const char *stringdata = (m->d.stringdata + m->d.data[priv(m->d.data)->methodData + 5 * i]);
                const QByteArray normalizedSignature = QMetaObject::normalizedSignature(stringdata);
                if (normalizedSignature == method) {
                    *baseObject = m;
                    return i;
                }
            }
        }
    }
    return -1;
}


int QMetaObject::indexOfConstructor(const char *constructor) const
{
    if (priv(d.data)->revision < 2)
        return -1;
    for (int i = priv(d.data)->constructorCount-1; i >= 0; --i) {
        const char *data = d.stringdata + d.data[priv(d.data)->constructorData + 5*i];
        if (data[0] == constructor[0] && strcmp(constructor + 1, data + 1) == 0) {
            return i;
        }
    }
    return -1;
}

int QMetaObject::indexOfMethod(const char *method) const
{
    const QMetaObject *m = this;
    int i = indexOfMethodRelative<0>(&m, method, false);
    if (i < 0) {
        m = this;
        i = indexOfMethodRelative<0>(&m, method, true);
    }
    if (i >= 0)
        i += m->methodOffset();
    return i;
}

int QMetaObject::indexOfSignal(const char *signal) const
{
    const QMetaObject *m = this;
    int i = QMetaObjectPrivate::indexOfSignalRelative(&m, signal, false);
    if (i < 0) {
        m = this;
        i = QMetaObjectPrivate::indexOfSignalRelative(&m, signal, true);
    }
    if (i >= 0)
        i += m->methodOffset();
    return i;
}

int QMetaObjectPrivate::indexOfSignalRelative(const QMetaObject **baseObject,
                                              const char *signal,
                                              bool normalizeStringData)
{
    int i = indexOfMethodRelative<MethodSignal>(baseObject, signal, normalizeStringData);
#ifndef QT_NO_DEBUG
    const QMetaObject *m = *baseObject;
    if (i >= 0 && m && m->d.superdata) {
        int conflict = m->d.superdata->indexOfMethod(signal);
        if (conflict >= 0)
            qWarning("QMetaObject::indexOfSignal: signal %s from %s redefined in %s",
                     signal, m->d.superdata->d.stringdata, m->d.stringdata);
    }
#endif
    return i;
}

int QMetaObject::indexOfSlot(const char *slot) const
{
    const QMetaObject *m = this;
    int i = QMetaObjectPrivate::indexOfSlotRelative(&m, slot, false);
    if (i < 0)
        i = QMetaObjectPrivate::indexOfSlotRelative(&m, slot, true);
    if (i >= 0)
        i += m->methodOffset();
    return i;
}

// same as indexOfSignalRelative but for slots.
int QMetaObjectPrivate::indexOfSlotRelative(const QMetaObject **m,
                                    const char *slot,
                                    bool normalizeStringData)
{
    return indexOfMethodRelative<MethodSlot>(m, slot, normalizeStringData);
}

static const QMetaObject *QMetaObject_findMetaObject(const QMetaObject *self, const char *name)
{
    while (self) {
        if (strcmp(self->d.stringdata, name) == 0)
            return self;
        if (self->d.extradata) {
#ifdef Q_NO_DATA_RELOCATION
            const QMetaObjectAccessor *e;
            Q_ASSERT(priv(self->d.data)->revision >= 2);
#else
            const QMetaObject **e;
            if (priv(self->d.data)->revision < 2) {
                e = (const QMetaObject**)(self->d.extradata);
            } else
#endif
            {
                const QMetaObjectExtraData *extra = (const QMetaObjectExtraData*)(self->d.extradata);
                e = extra->objects;
            }
            if (e) {
                while (*e) {
#ifdef Q_NO_DATA_RELOCATION
                    if (const QMetaObject *m =QMetaObject_findMetaObject(&((*e)()), name))
#else
                    if (const QMetaObject *m =QMetaObject_findMetaObject((*e), name))
#endif
                        return m;
                    ++e;
                }
            }
        }
        self = self->d.superdata;
    }
    return self;
}

int QMetaObject::indexOfEnumerator(const char *name) const
{
    const QMetaObject *m = this;
    while (m) {
        const QMetaObjectPrivate *d = priv(m->d.data);
        for (int i = d->enumeratorCount - 1; i >= 0; --i) {
            const char *prop = m->d.stringdata + m->d.data[d->enumeratorData + 4*i];
            if (name[0] == prop[0] && strcmp(name + 1, prop + 1) == 0) {
                i += m->enumeratorOffset();
                return i;
            }
        }
        m = m->d.superdata;
    }
    return -1;
}

int QMetaObject::indexOfProperty(const char *name) const
{
    const QMetaObject *m = this;
    while (m) {
        const QMetaObjectPrivate *d = priv(m->d.data);
        for (int i = d->propertyCount-1; i >= 0; --i) {
            const char *prop = m->d.stringdata + m->d.data[d->propertyData + 3*i];
            if (name[0] == prop[0] && strcmp(name + 1, prop + 1) == 0) {
                i += m->propertyOffset();
                return i;
            }
        }
        m = m->d.superdata;
    }

    if (priv(this->d.data)->revision >= 3 && (priv(this->d.data)->flags & DynamicMetaObject)) {
        QAbstractDynamicMetaObject *me = 
            const_cast<QAbstractDynamicMetaObject *>(static_cast<const QAbstractDynamicMetaObject *>(this));

        return me->createProperty(name, 0);
    }

    return -1;
}

int QMetaObject::indexOfClassInfo(const char *name) const
{
    int i = -1;
    const QMetaObject *m = this;
    while (m && i < 0) {
        for (i = priv(m->d.data)->classInfoCount-1; i >= 0; --i)
            if (strcmp(name, m->d.stringdata
                       + m->d.data[priv(m->d.data)->classInfoData + 2*i]) == 0) {
                i += m->classInfoOffset();
                break;
            }
        m = m->d.superdata;
    }
    return i;
}

QMetaMethod QMetaObject::constructor(int index) const
{
    int i = index;
    QMetaMethod result;
    if (priv(d.data)->revision >= 2 && i >= 0 && i < priv(d.data)->constructorCount) {
        result.mobj = this;
        result.handle = priv(d.data)->constructorData + 5*i;
    }
    return result;
}

QMetaMethod QMetaObject::method(int index) const
{
    int i = index;
    i -= methodOffset();
    if (i < 0 && d.superdata)
        return d.superdata->method(index);

    QMetaMethod result;
    if (i >= 0 && i < priv(d.data)->methodCount) {
        result.mobj = this;
        result.handle = priv(d.data)->methodData + 5*i;
    }
    return result;
}

QMetaEnum QMetaObject::enumerator(int index) const
{
    int i = index;
    i -= enumeratorOffset();
    if (i < 0 && d.superdata)
        return d.superdata->enumerator(index);

    QMetaEnum result;
    if (i >= 0 && i < priv(d.data)->enumeratorCount) {
        result.mobj = this;
        result.handle = priv(d.data)->enumeratorData + 4*i;
    }
    return result;
}

QMetaProperty QMetaObject::property(int index) const
{
    int i = index;
    i -= propertyOffset();
    if (i < 0 && d.superdata)
        return d.superdata->property(index);

    QMetaProperty result;
    if (i >= 0 && i < priv(d.data)->propertyCount) {
        int handle = priv(d.data)->propertyData + 3*i;
        int flags = d.data[handle + 2];
        const char *type = d.stringdata + d.data[handle + 1];
        result.mobj = this;
        result.handle = handle;
        result.idx = i;

        if (flags & EnumOrFlag) {
            result.menum = enumerator(indexOfEnumerator(type));
            if (!result.menum.isValid()) {
                QByteArray enum_name = type;
                QByteArray scope_name = d.stringdata;
                int s = enum_name.lastIndexOf("::");
                if (s > 0) {
                    scope_name = enum_name.left(s);
                    enum_name = enum_name.mid(s + 2);
                }
                const QMetaObject *scope = 0;
                if (scope_name == "Qt")
                    scope = &QObject::staticQtMetaObject;
                else
                    scope = QMetaObject_findMetaObject(this, scope_name);
                if (scope)
                    result.menum = scope->enumerator(scope->indexOfEnumerator(enum_name));
            }
        }
    }
    return result;
}

QMetaProperty QMetaObject::userProperty() const
{
    const int propCount = propertyCount();
    for (int i = propCount - 1; i >= 0; --i) {
        const QMetaProperty prop = property(i);
        if (prop.isUser())
            return prop;
    }
    return QMetaProperty();
}

QMetaClassInfo QMetaObject::classInfo(int index) const
{
    int i = index;
    i -= classInfoOffset();
    if (i < 0 && d.superdata)
        return d.superdata->classInfo(index);

    QMetaClassInfo result;
    if (i >= 0 && i < priv(d.data)->classInfoCount) {
        result.mobj = this;
        result.handle = priv(d.data)->classInfoData + 2*i;
    }
    return result;
}

bool QMetaObject::checkConnectArgs(const char *signal, const char *method)
{
    const char *s1 = signal;
    const char *s2 = method;
    while (*s1++ != '(') { }                        // scan to first '('
    while (*s2++ != '(') { }
    if (*s2 == ')' || qstrcmp(s1,s2) == 0)        // method has no args or
        return true;                                //   exact match
    int s1len = qstrlen(s1);
    int s2len = qstrlen(s2);
    if (s2len < s1len && strncmp(s1,s2,s2len-1)==0 && s1[s2len-1]==',')
        return true;                                // method has less args
    return false;
}

static void qRemoveWhitespace(const char *s, char *d)
{
    char last = 0;
    while (*s && is_space(*s))
        s++;
    while (*s) {
        while (*s && !is_space(*s))
            last = *d++ = *s++;
        while (*s && is_space(*s))
            s++;
        if (*s && ((is_ident_char(*s) && is_ident_char(last))
                   || ((*s == ':') && (last == '<')))) {
            last = *d++ = ' ';
        }
    }
    *d = '\0';
}

static char *qNormalizeType(char *d, int &templdepth, QByteArray &result)
{
    const char *t = d;
    while (*d && (templdepth
                   || (*d != ',' && *d != ')'))) {
        if (*d == '<')
            ++templdepth;
        if (*d == '>')
            --templdepth;
        ++d;
    }
    if (strncmp("void", t, d - t) != 0)
        result += normalizeTypeInternal(t, d);

    return d;
}


QByteArray QMetaObject::normalizedType(const char *type)
{
    QByteArray result;

    if (!type || !*type)
        return result;

    QVarLengthArray<char> stackbuf(qstrlen(type) + 1);
    qRemoveWhitespace(type, stackbuf.data());
    int templdepth = 0;
    qNormalizeType(stackbuf.data(), templdepth, result);

    return result;
}

QByteArray QMetaObject::normalizedSignature(const char *method)
{
    QByteArray result;
    if (!method || !*method)
        return result;
    int len = int(strlen(method));
    QVarLengthArray<char> stackbuf(len + 1);
    char *d = stackbuf.data();
    qRemoveWhitespace(method, d);

    result.reserve(len);

    int argdepth = 0;
    int templdepth = 0;
    while (*d) {
        if (argdepth == 1) {
            d = qNormalizeType(d, templdepth, result);
            if (!*d) //most likely an invalid signature.
                break;
        }
        if (*d == '(')
            ++argdepth;
        if (*d == ')')
            --argdepth;
        result += *d++;
    }

    return result;
}

enum { MaximumParamCount = 11 }; // up to 10 arguments + 1 return value

bool QMetaObject::invokeMethod(QObject *obj,
                               const char *member,
                               Qt::ConnectionType type,
                               QGenericReturnArgument ret,
                               QGenericArgument val0,
                               QGenericArgument val1,
                               QGenericArgument val2,
                               QGenericArgument val3,
                               QGenericArgument val4,
                               QGenericArgument val5,
                               QGenericArgument val6,
                               QGenericArgument val7,
                               QGenericArgument val8,
                               QGenericArgument val9)
{
    if (!obj)
        return false;

    QVarLengthArray<char, 512> sig;
    int len = qstrlen(member);
    if (len <= 0)
        return false;
    sig.append(member, len);
    sig.append('(');

    const char *typeNames[] = {ret.name(), val0.name(), val1.name(), val2.name(), val3.name(),
                               val4.name(), val5.name(), val6.name(), val7.name(), val8.name(),
                               val9.name()};

    int paramCount;
    for (paramCount = 1; paramCount < MaximumParamCount; ++paramCount) {
        len = qstrlen(typeNames[paramCount]);
        if (len <= 0)
            break;
        sig.append(typeNames[paramCount], len);
        sig.append(',');
    }
    if (paramCount == 1)
        sig.append(')'); // no parameters
    else
        sig[sig.size() - 1] = ')';
    sig.append('\0');

    int idx = obj->metaObject()->indexOfMethod(sig.constData());
    if (idx < 0) {
        QByteArray norm = QMetaObject::normalizedSignature(sig.constData());
        idx = obj->metaObject()->indexOfMethod(norm.constData());
    }

    if (idx < 0 || idx >= obj->metaObject()->methodCount()) {
        qWarning("QMetaObject::invokeMethod: No such method %s::%s",
                 obj->metaObject()->className(), sig.constData());
        return false;
    }
    QMetaMethod method = obj->metaObject()->method(idx);
    return method.invoke(obj, type, ret,
                         val0, val1, val2, val3, val4, val5, val6, val7, val8, val9);
}

const char *QMetaMethod::signature() const
{
    if (!mobj)
        return 0;
    return mobj->d.stringdata + mobj->d.data[handle];
}

QList<QByteArray> QMetaMethod::parameterTypes() const
{
    QList<QByteArray> list;
    if (!mobj)
        return list;
    const char *signature = mobj->d.stringdata + mobj->d.data[handle];
    while (*signature && *signature != '(')
        ++signature;
    while (*signature && *signature != ')' && *++signature != ')') {
        const char *begin = signature;
        int level = 0;
        while (*signature && (level > 0 || *signature != ',') && *signature != ')') {
            if (*signature == '<')
                ++level;
            else if (*signature == '>')
                --level;
            ++signature;
        }
        list += QByteArray(begin, signature - begin);
    }
    return list;
}

QList<QByteArray> QMetaMethod::parameterNames() const
{
    QList<QByteArray> list;
    if (!mobj)
        return list;
    const char *names =  mobj->d.stringdata + mobj->d.data[handle + 1];
    if (*names == 0) {
        // do we have one or zero arguments?
        const char *signature = mobj->d.stringdata + mobj->d.data[handle];
        while (*signature && *signature != '(')
            ++signature;
        if (*++signature != ')')
            list += QByteArray();
    } else {
        --names;
        do {
            const char *begin = ++names;
            while (*names && *names != ',')
                ++names;
            list += QByteArray(begin, names - begin);
        } while (*names);
    }
    return list;
}


const char *QMetaMethod::typeName() const
{
    if (!mobj)
        return 0;
    return mobj->d.stringdata + mobj->d.data[handle + 2];
}

const char *QMetaMethod::tag() const
{
    if (!mobj)
        return 0;
    return mobj->d.stringdata + mobj->d.data[handle + 3];
}


int QMetaMethod::attributes() const
{
    if (!mobj)
        return false;
    return ((mobj->d.data[handle + 4])>>4);
}

int QMetaMethod::methodIndex() const
{
    if (!mobj)
        return -1;
    return ((handle - priv(mobj->d.data)->methodData) / 5) + mobj->methodOffset();
}

int QMetaMethod::revision() const
{
    if (!mobj)
        return 0;
    if ((QMetaMethod::Access)(mobj->d.data[handle + 4] & MethodRevisioned)) {
        int offset = priv(mobj->d.data)->methodData
                     + priv(mobj->d.data)->methodCount * 5
                     + (handle - priv(mobj->d.data)->methodData) / 5;
        return mobj->d.data[offset];
    }
    return 0;
}

QMetaMethod::Access QMetaMethod::access() const
{
    if (!mobj)
        return Private;
    return (QMetaMethod::Access)(mobj->d.data[handle + 4] & AccessMask);
}

QMetaMethod::MethodType QMetaMethod::methodType() const
{
    if (!mobj)
        return QMetaMethod::Method;
    return (QMetaMethod::MethodType)((mobj->d.data[handle + 4] & MethodTypeMask)>>2);
}

bool QMetaMethod::invoke(QObject *object,
                         Qt::ConnectionType connectionType,
                         QGenericReturnArgument returnValue,
                         QGenericArgument val0,
                         QGenericArgument val1,
                         QGenericArgument val2,
                         QGenericArgument val3,
                         QGenericArgument val4,
                         QGenericArgument val5,
                         QGenericArgument val6,
                         QGenericArgument val7,
                         QGenericArgument val8,
                         QGenericArgument val9) const
{
    if (!object || !mobj)
        return false;

    Q_ASSERT(mobj->cast(object));

    // check return type
    if (returnValue.data()) {
        const char *retType = typeName();
        if (qstrcmp(returnValue.name(), retType) != 0) {
            // normalize the return value as well
            // the trick here is to make a function signature out of the return type
            // so that we can call normalizedSignature() and avoid duplicating code
            QByteArray unnormalized;
            int len = qstrlen(returnValue.name());

            unnormalized.reserve(len + 3);
            unnormalized = "_(";        // the function is called "_"
            unnormalized.append(returnValue.name());
            unnormalized.append(')');

            QByteArray normalized = QMetaObject::normalizedSignature(unnormalized.constData());
            normalized.truncate(normalized.length() - 1); // drop the ending ')'

            if (qstrcmp(normalized.constData() + 2, retType) != 0)
                return false;
        }
    }

    // check argument count (we don't allow invoking a method if given too few arguments)
    const char *typeNames[] = {
        returnValue.name(),
        val0.name(),
        val1.name(),
        val2.name(),
        val3.name(),
        val4.name(),
        val5.name(),
        val6.name(),
        val7.name(),
        val8.name(),
        val9.name()
    };
    int paramCount;
    for (paramCount = 1; paramCount < MaximumParamCount; ++paramCount) {
        if (qstrlen(typeNames[paramCount]) <= 0)
            break;
    }
    int metaMethodArgumentCount = 0;
    {
        // based on QMetaObject::parameterNames()
        const char *names = mobj->d.stringdata + mobj->d.data[handle + 1];
        if (*names == 0) {
            // do we have one or zero arguments?
            const char *signature = mobj->d.stringdata + mobj->d.data[handle];
            while (*signature && *signature != '(')
                ++signature;
            if (*++signature != ')')
                ++metaMethodArgumentCount;
        } else {
            --names;
            do {
                ++names;
                while (*names && *names != ',')
                    ++names;
                ++metaMethodArgumentCount;
            } while (*names);
        }
    }
    if (paramCount <= metaMethodArgumentCount)
        return false;

    // check connection type
    QThread *currentThread = QThread::currentThread();
    QThread *objectThread = object->thread();
    if (connectionType == Qt::AutoConnection) {
        connectionType = currentThread == objectThread
                         ? Qt::DirectConnection
                         : Qt::QueuedConnection;
    }

#ifdef QT_NO_THREAD
    if (connectionType == Qt::BlockingQueuedConnection) {
        connectionType = Qt::DirectConnection;
    }
#endif

    // invoke!
    void *param[] = {
        returnValue.data(),
        val0.data(),
        val1.data(),
        val2.data(),
        val3.data(),
        val4.data(),
        val5.data(),
        val6.data(),
        val7.data(),
        val8.data(),
        val9.data()
    };
    // recompute the methodIndex by reversing the arithmetic in QMetaObject::property()
    int idx_relative = ((handle - priv(mobj->d.data)->methodData) / 5);
    int idx_offset =  mobj->methodOffset();
    QObjectPrivate::StaticMetaCallFunction callFunction =
        (QMetaObjectPrivate::get(mobj)->revision >= 6 && mobj->d.extradata)
        ? reinterpret_cast<const QMetaObjectExtraData *>(mobj->d.extradata)->static_metacall : 0;

    if (connectionType == Qt::DirectConnection) {
        if (callFunction) {
            callFunction(object, QMetaObject::InvokeMetaMethod, idx_relative, param);
            return true;
        } else {
            return QMetaObject::metacall(object, QMetaObject::InvokeMetaMethod, idx_relative + idx_offset, param) < 0;
        }
    } else if (connectionType == Qt::QueuedConnection) {
        if (returnValue.data()) {
            qWarning("QMetaMethod::invoke: Unable to invoke methods with return values in "
                     "queued connections");
            return false;
        }

        int nargs = 1; // include return type
        void **args = (void **) qMalloc(paramCount * sizeof(void *));
        Q_CHECK_PTR(args);
        int *types = (int *) qMalloc(paramCount * sizeof(int));
        Q_CHECK_PTR(types);
        types[0] = 0; // return type
        args[0] = 0;

        for (int i = 1; i < paramCount; ++i) {
            types[i] = QMetaType::type(typeNames[i]);
            if (types[i]) {
                args[i] = QMetaType::construct(types[i], param[i]);
                ++nargs;
            } else if (param[i]) {
                qWarning("QMetaMethod::invoke: Unable to handle unregistered datatype '%s'",
                         typeNames[i]);
                for (int x = 1; x < i; ++x) {
                    if (types[x] && args[x])
                        QMetaType::destroy(types[x], args[x]);
                }
                qFree(types);
                qFree(args);
                return false;
            }
        }

        QCoreApplication::postEvent(object, new QMetaCallEvent(idx_offset, idx_relative, callFunction,
                                                        0, -1, nargs, types, args));
    } else { // blocking queued connection
#ifndef QT_NO_THREAD
        if (currentThread == objectThread) {
            qWarning("QMetaMethod::invoke: Dead lock detected in "
                        "BlockingQueuedConnection: Receiver is %s(%p)",
                        mobj->className(), object);
        }

        QSemaphore semaphore;
        QCoreApplication::postEvent(object, new QMetaCallEvent(idx_offset, idx_relative, callFunction,
                                                        0, -1, 0, 0, param, &semaphore));
        semaphore.acquire();
#endif // QT_NO_THREAD
    }
    return true;
}

const char *QMetaEnum::name() const
{
    if (!mobj)
        return 0;
    return mobj->d.stringdata + mobj->d.data[handle];
}

int QMetaEnum::keyCount() const
{
    if (!mobj)
        return 0;
    return mobj->d.data[handle + 2];
}


const char *QMetaEnum::key(int index) const
{
    if (!mobj)
        return 0;
    int count = mobj->d.data[handle + 2];
    int data = mobj->d.data[handle + 3];
    if (index >= 0  && index < count)
        return mobj->d.stringdata + mobj->d.data[data + 2*index];
    return 0;
}

int QMetaEnum::value(int index) const
{
    if (!mobj)
        return 0;
    int count = mobj->d.data[handle + 2];
    int data = mobj->d.data[handle + 3];
    if (index >= 0  && index < count)
        return mobj->d.data[data + 2*index + 1];
    return -1;
}


bool QMetaEnum::isFlag() const
{
    return mobj && mobj->d.data[handle + 1];
}


const char *QMetaEnum::scope() const
{
    return mobj?mobj->d.stringdata : 0;
}

int QMetaEnum::keyToValue(const char *key) const
{
    if (!mobj || !key)
        return -1;
    uint scope = 0;
    const char *qualified_key = key;
    const char *s = key + qstrlen(key);
    while (s > key && *s != ':')
        --s;
    if (s > key && *(s-1)==':') {
        scope = s - key - 1;
        key += scope + 2;
    }
    int count = mobj->d.data[handle + 2];
    int data = mobj->d.data[handle + 3];
    for (int i = 0; i < count; ++i)
        if ((!scope || (qstrlen(mobj->d.stringdata) == scope && strncmp(qualified_key, mobj->d.stringdata, scope) == 0))
             && strcmp(key, mobj->d.stringdata + mobj->d.data[data + 2*i]) == 0)
            return mobj->d.data[data + 2*i + 1];
    return -1;
}

const char* QMetaEnum::valueToKey(int value) const
{
    if (!mobj)
        return 0;
    int count = mobj->d.data[handle + 2];
    int data = mobj->d.data[handle + 3];
    for (int i = 0; i < count; ++i)
        if (value == (int)mobj->d.data[data + 2*i + 1])
            return mobj->d.stringdata + mobj->d.data[data + 2*i];
    return 0;
}

int QMetaEnum::keysToValue(const char *keys) const
{
    if (!mobj)
        return -1;
    QStringList l = QString::fromLatin1(keys).split(QLatin1Char('|'));
    //#### TODO write proper code, do not use QStringList
    int value = 0;
    int count = mobj->d.data[handle + 2];
    int data = mobj->d.data[handle + 3];
    for (int li = 0; li < l.size(); ++li) {
        QString trimmed = l.at(li).trimmed();
        QByteArray qualified_key = trimmed.toLatin1();
        const char *key = qualified_key.constData();
        uint scope = 0;
        const char *s = key + qstrlen(key);
        while (s > key && *s != ':')
            --s;
        if (s > key && *(s-1)==':') {
            scope = s - key - 1;
            key += scope + 2;
        }
        int i;
        for (i = count-1; i >= 0; --i)
            if ((!scope || (qstrlen(mobj->d.stringdata) == scope && strncmp(qualified_key.constData(), mobj->d.stringdata, scope) == 0))
                 && strcmp(key, mobj->d.stringdata + mobj->d.data[data + 2*i]) == 0) {
                value |= mobj->d.data[data + 2*i + 1];
                break;
            }
        if (i < 0)
            value |= -1;
    }
    return value;
}

QByteArray QMetaEnum::valueToKeys(int value) const
{
    QByteArray keys;
    if (!mobj)
        return keys;
    int count = mobj->d.data[handle + 2];
    int data = mobj->d.data[handle + 3];
    int v = value;
    for(int i = 0; i < count; i++) {
        int k = mobj->d.data[data + 2*i + 1];
        if ((k != 0 && (v & k) == k ) ||  (k == value))  {
            v = v & ~k;
            if (!keys.isEmpty())
                keys += '|';
            keys += mobj->d.stringdata + mobj->d.data[data + 2*i];
        }
    }
    return keys;
}

static QByteArray qualifiedName(const QMetaEnum &e)
{
    return QByteArray(e.scope()) + "::" + e.name();
}

QMetaProperty::QMetaProperty()
    : mobj(0), handle(0), idx(0)
{
}


const char *QMetaProperty::name() const
{
    if (!mobj)
        return 0;
    int handle = priv(mobj->d.data)->propertyData + 3*idx;
    return mobj->d.stringdata + mobj->d.data[handle];
}

const char *QMetaProperty::typeName() const
{
    if (!mobj)
        return 0;
    int handle = priv(mobj->d.data)->propertyData + 3*idx;
    return mobj->d.stringdata + mobj->d.data[handle + 1];
}

QVariant::Type QMetaProperty::type() const
{
    if (!mobj)
        return QVariant::Invalid;
    int handle = priv(mobj->d.data)->propertyData + 3*idx;
    uint flags = mobj->d.data[handle + 2];

    uint type = flags >> 24;
    if (type == 0xff) // special value for QVariant
        type = QVariant::LastType;
    if (type)
        return QVariant::Type(type);
    if (isEnumType()) {
        int enumMetaTypeId = QMetaType::type(qualifiedName(menum));
        if (enumMetaTypeId == 0)
            return QVariant::Int;
    }
#ifdef QT_COORD_TYPE
    // qreal metatype must be resolved at runtime.
    if (strcmp(typeName(), "qreal") == 0)
        return QVariant::Type(qMetaTypeId<qreal>());
#endif

    return QVariant::UserType;
}

int QMetaProperty::userType() const
{
    QVariant::Type tp = type();
    if (tp != QVariant::UserType)
        return tp;
    if (isEnumType()) {
        int enumMetaTypeId = QMetaType::type(qualifiedName(menum));
        return enumMetaTypeId;
    }
    return QMetaType::type(typeName());
}

int QMetaProperty::propertyIndex() const
{
    if (!mobj)
        return -1;
    return idx + mobj->propertyOffset();
}

bool QMetaProperty::isFlagType() const
{
    return isEnumType() && menum.isFlag();
}

bool QMetaProperty::isEnumType() const
{
    if (!mobj)
        return false;
    int handle = priv(mobj->d.data)->propertyData + 3*idx;
    int flags = mobj->d.data[handle + 2];
    return (flags & EnumOrFlag) && menum.name();
}

bool QMetaProperty::hasStdCppSet() const
{
    if (!mobj)
        return false;
    int handle = priv(mobj->d.data)->propertyData + 3*idx;
    int flags = mobj->d.data[handle + 2];
    return (flags & StdCppSet);
}

QMetaEnum QMetaProperty::enumerator() const
{
    return menum;
}

QVariant QMetaProperty::read(const QObject *object) const
{
    if (!object || !mobj)
        return QVariant();

    uint t = QVariant::Int;
    if (isEnumType()) {
        /*
          try to create a QVariant that can be converted to this enum
          type (only works if the enum has already been registered
          with QMetaType)
        */
        int enumMetaTypeId = QMetaType::type(qualifiedName(menum));
        if (enumMetaTypeId != 0)
            t = enumMetaTypeId;
    } else {
        int handle = priv(mobj->d.data)->propertyData + 3*idx;
        uint flags = mobj->d.data[handle + 2];
        const char *typeName = mobj->d.stringdata + mobj->d.data[handle + 1];
        t = (flags >> 24);
        if (t == 0xff) // special value for QVariant
            t = QVariant::LastType;
        if (t == QVariant::Invalid)
            t = QMetaType::type(typeName);
        if (t == QVariant::Invalid)
            t = QVariant::nameToType(typeName);
        if (t == QVariant::Invalid || t == QVariant::UserType) {
            if (t == QVariant::Invalid)
                qWarning("QMetaProperty::read: Unable to handle unregistered datatype '%s' for property '%s::%s'", typeName, mobj->className(), name());
            return QVariant();
        }
    }

    // the status variable is changed by qt_metacall to indicate what it did
    // this feature is currently only used by QtDBus and should not be depended
    // upon. Don't change it without looking into QDBusAbstractInterface first
    // -1 (unchanged): normal qt_metacall, result stored in argv[0]
    // changed: result stored directly in value
    int status = -1;
    QVariant value;
    void *argv[] = { 0, &value, &status };
    if (t == QVariant::LastType) {
        argv[0] = &value;
    } else {
        value = QVariant(t, (void*)0);
        argv[0] = value.data();
    }
    QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::ReadProperty,
                          idx + mobj->propertyOffset(), argv);

    if (status != -1)
        return value;
    if (t != QVariant::LastType && argv[0] != value.data())
        // pointer or reference
        return QVariant((QVariant::Type)t, argv[0]);
    return value;
}

bool QMetaProperty::write(QObject *object, const QVariant &value) const
{
    if (!object || !isWritable())
        return false;

    QVariant v = value;
    uint t = QVariant::Invalid;
    if (isEnumType()) {
        if (v.type() == QVariant::String
#ifdef QT3_SUPPORT
            || v.type() == QVariant::CString
#endif
            ) {
            if (isFlagType())
                v = QVariant(menum.keysToValue(value.toByteArray()));
            else
                v = QVariant(menum.keyToValue(value.toByteArray()));
        } else if (v.type() != QVariant::Int && v.type() != QVariant::UInt) {
            int enumMetaTypeId = QMetaType::type(qualifiedName(menum));
            if ((enumMetaTypeId == 0) || (v.userType() != enumMetaTypeId) || !v.constData())
                return false;
            v = QVariant(*reinterpret_cast<const int *>(v.constData()));
        }
        v.convert(QVariant::Int);
    } else {
        int handle = priv(mobj->d.data)->propertyData + 3*idx;
        uint flags = mobj->d.data[handle + 2];
        t = flags >> 24;
        if (t == 0xff) // special value for QVariant
            t = QVariant::LastType;
        if (t == QVariant::Invalid) {
            const char *typeName = mobj->d.stringdata + mobj->d.data[handle + 1];
            const char *vtypeName = value.typeName();
            if (vtypeName && strcmp(typeName, vtypeName) == 0)
                t = value.userType();
            else
                t = QVariant::nameToType(typeName);
        }
        if (t == QVariant::Invalid)
            return false;
        if (t != QVariant::LastType && t != (uint)value.userType() && (t < QMetaType::User && !v.convert((QVariant::Type)t)))
            return false;
    }

    // the status variable is changed by qt_metacall to indicate what it did
    // this feature is currently only used by QtDBus and should not be depended
    // upon. Don't change it without looking into QDBusAbstractInterface first
    // -1 (unchanged): normal qt_metacall, result stored in argv[0]
    // changed: result stored directly in value, return the value of status
    int status = -1;
    // the flags variable is used by the declarative module to implement
    // interception of property writes.
    int flags = 0;
    void *argv[] = { 0, &v, &status, &flags };
    if (t == QVariant::LastType)
        argv[0] = &v;
    else
        argv[0] = v.data();
    QMetaObject::metacall(object, QMetaObject::WriteProperty, idx + mobj->propertyOffset(), argv);
    return status;
}

bool QMetaProperty::reset(QObject *object) const
{
    if (!object || !mobj || !isResettable())
        return false;
    void *argv[] = { 0 };
    QMetaObject::metacall(object, QMetaObject::ResetProperty, idx + mobj->propertyOffset(), argv);
    return true;
}

bool QMetaProperty::isResettable() const
{
    if (!mobj)
        return false;
    int flags = mobj->d.data[handle + 2];
    return flags & Resettable;
}

bool QMetaProperty::isReadable() const
{
    if (!mobj)
        return false;
    int flags = mobj->d.data[handle + 2];
    return flags & Readable;
}

bool QMetaProperty::hasNotifySignal() const
{
    if (!mobj)
        return false;
    int flags = mobj->d.data[handle + 2];
    return flags & Notify;
}

QMetaMethod QMetaProperty::notifySignal() const
{
    int id = notifySignalIndex();
    if (id != -1)
        return mobj->method(id); 
    else
        return QMetaMethod();
}

int QMetaProperty::notifySignalIndex() const
{
    if (hasNotifySignal()) {
        int offset = priv(mobj->d.data)->propertyData +
                     priv(mobj->d.data)->propertyCount * 3 + idx;
        return mobj->d.data[offset] + mobj->methodOffset();
    } else {
        return -1;
    }
}

int QMetaProperty::revision() const
{
    if (!mobj)
        return 0;
    int flags = mobj->d.data[handle + 2];
    if (flags & Revisioned) {
        int offset = priv(mobj->d.data)->propertyData +
                     priv(mobj->d.data)->propertyCount * 3 + idx;
        // Revision data is placed after NOTIFY data, if present.
        // Iterate through properties to discover whether we have NOTIFY signals.
        for (int i = 0; i < priv(mobj->d.data)->propertyCount; ++i) {
            int handle = priv(mobj->d.data)->propertyData + 3*i;
            if (mobj->d.data[handle + 2] & Notify) {
                offset += priv(mobj->d.data)->propertyCount;
                break;
            }
        }
        return mobj->d.data[offset];
    } else {
        return 0;
    }
}

bool QMetaProperty::isWritable() const
{
    if (!mobj)
        return false;
    int flags = mobj->d.data[handle + 2];
    return flags & Writable;
}


bool QMetaProperty::isDesignable(const QObject *object) const
{
    if (!mobj)
        return false;
    int flags = mobj->d.data[handle + 2];
    bool b = flags & Designable;
    if (object) {
        void *argv[] = { &b };
        QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::QueryPropertyDesignable,
                              idx + mobj->propertyOffset(), argv);
    }
    return b;


}

bool QMetaProperty::isScriptable(const QObject *object) const
{
    if (!mobj)
        return false;
    int flags = mobj->d.data[handle + 2];
    bool b = flags & Scriptable;
    if (object) {
        void *argv[] = { &b };
        QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::QueryPropertyScriptable,
                              idx + mobj->propertyOffset(), argv);
    }
    return b;
}

bool QMetaProperty::isStored(const QObject *object) const
{
    if (!mobj)
        return false;
    int flags = mobj->d.data[handle + 2];
    bool b = flags & Stored;
    if (object) {
        void *argv[] = { &b };
        QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::QueryPropertyStored,
                              idx + mobj->propertyOffset(), argv);
    }
    return b;
}

bool QMetaProperty::isUser(const QObject *object) const
{
    if (!mobj)
        return false;
    int flags = mobj->d.data[handle + 2];
    bool b = flags & User;
    if (object) {
        void *argv[] = { &b };
        QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::QueryPropertyUser,
                              idx + mobj->propertyOffset(), argv);
    }
    return b;
}

---

Qt 4.8 Source Code Browser