Dynamic meta object support

This is an internal API used by declarative.

Authored-by: mae
Reviewed-by: Aaron Kennedy

5 files changed, 56 insertions, 19 deletions

diff --git a/src/corelib/kernel/qmetaobject.cpp b/src/corelib/kernel/qmetaobject.cpp
index 611eff3..fc17e00 100644
--- a/src/corelib/kernel/qmetaobject.cpp
+++ b/src/corelib/kernel/qmetaobject.cpp
@@ -182,6 +182,10 @@ enum MethodFlags  {
     MethodScriptable = 0x40
 };
 
+enum MetaObjectFlags {
+    DynamicMetaObject = 0x01
+};
+
 struct QMetaObjectPrivate
 {
     int revision;
@@ -191,6 +195,7 @@ struct QMetaObjectPrivate
     int propertyCount, propertyData;
     int enumeratorCount, enumeratorData;
     int constructorCount, constructorData;
+    int flags;
 };
 
 static inline const QMetaObjectPrivate *priv(const uint* data)
@@ -280,6 +285,17 @@ int QMetaObject::static_metacall(Call cl, int idx, void **argv) const
 }
 
 /*!
+    \internal
+*/
+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);
+}
+
+/*!
     \fn const char *QMetaObject::className() const
 
     Returns the class name.
@@ -699,6 +715,14 @@ int QMetaObject::indexOfProperty(const char *name) const
             }
         m = m->d.superdata;
     }
+
+    if (i == -1 && priv(this->d.data)->revision >= 3 && (priv(this->d.data)->flags & DynamicMetaObject)){
+        QAbstractDynamicMetaObject *me = 
+            const_cast<QAbstractDynamicMetaObject *>(static_cast<const QAbstractDynamicMetaObject *>(this));
+
+        i = me->createProperty(name, 0);
+    }
+
     return i;
 }
 
@@ -1538,7 +1562,7 @@ bool QMetaMethod::invoke(QObject *object,
     // recompute the methodIndex by reversing the arithmetic in QMetaObject::property()
     int methodIndex = ((handle - priv(mobj->d.data)->methodData) / 5) + mobj->methodOffset();
     if (connectionType == Qt::DirectConnection) {
-        return object->qt_metacall(QMetaObject::InvokeMetaMethod, methodIndex, param) < 0;
+        return QMetaObject::metacall(object, QMetaObject::InvokeMetaMethod, methodIndex, param) < 0;
     } else {
         if (returnValue.data()) {
             qWarning("QMetaMethod::invoke: Unable to invoke methods with return values in "
@@ -2174,9 +2198,8 @@ QVariant QMetaProperty::read(const QObject *object) const
         value = QVariant(t, (void*)0);
         argv[0] = value.data();
     }
-    const_cast<QObject*>(object)->qt_metacall(QMetaObject::ReadProperty,
-                                              idx + mobj->propertyOffset(),
-                                              argv);
+    QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::ReadProperty,
+                          idx + mobj->propertyOffset(), argv);
 
     if (status != -1)
         return value;
@@ -2247,7 +2270,7 @@ bool QMetaProperty::write(QObject *object, const QVariant &value) const
         argv[0] = &v;
     else
         argv[0] = v.data();
-    object->qt_metacall(QMetaObject::WriteProperty, idx + mobj->propertyOffset(), argv);
+    QMetaObject::metacall(object, QMetaObject::WriteProperty, idx + mobj->propertyOffset(), argv);
     return status;
 }
 
@@ -2264,7 +2287,7 @@ bool QMetaProperty::reset(QObject *object) const
     if (!object || !mobj || !isResettable())
         return false;
     void *argv[] = { 0 };
-    object->qt_metacall(QMetaObject::ResetProperty, idx + mobj->propertyOffset(), argv);
+    QMetaObject::metacall(object, QMetaObject::ResetProperty, idx + mobj->propertyOffset(), argv);
     return true;
 }
 
@@ -2378,8 +2401,8 @@ bool QMetaProperty::isDesignable(const QObject *object) const
     bool b = flags & Designable;
     if (object) {
         void *argv[] = { &b };
-        const_cast<QObject*>(object)->qt_metacall(QMetaObject::QueryPropertyDesignable,
-                                                  idx + mobj->propertyOffset(), argv);
+        QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::QueryPropertyDesignable,
+                              idx + mobj->propertyOffset(), argv);
     }
     return b;
 
@@ -2404,8 +2427,8 @@ bool QMetaProperty::isScriptable(const QObject *object) const
     bool b = flags & Scriptable;
     if (object) {
         void *argv[] = { &b };
-        const_cast<QObject*>(object)->qt_metacall(QMetaObject::QueryPropertyScriptable,
-                                                  idx + mobj->propertyOffset(), argv);
+        QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::QueryPropertyScriptable,
+                              idx + mobj->propertyOffset(), argv);
     }
     return b;
 }
@@ -2428,8 +2451,8 @@ bool QMetaProperty::isStored(const QObject *object) const
     bool b = flags & Stored;
     if (object) {
         void *argv[] = { &b };
-        const_cast<QObject*>(object)->qt_metacall(QMetaObject::QueryPropertyStored,
-                                                  idx + mobj->propertyOffset(), argv);
+        QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::QueryPropertyStored,
+                              idx + mobj->propertyOffset(), argv);
     }
     return b;
 }
@@ -2455,8 +2478,8 @@ bool QMetaProperty::isUser(const QObject *object) const
     bool b = flags & User;
     if (object) {
         void *argv[] = { &b };
-        const_cast<QObject*>(object)->qt_metacall(QMetaObject::QueryPropertyUser,
-                                                  idx + mobj->propertyOffset(), argv);
+        QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::QueryPropertyUser,
+                              idx + mobj->propertyOffset(), argv);
     }
     return b;
 }
@@ -2520,8 +2543,8 @@ bool QMetaProperty::isEditable(const QObject *object) const
     bool b = flags & Editable;
     if (object) {
         void *argv[] = { &b };
-        const_cast<QObject*>(object)->qt_metacall(QMetaObject::QueryPropertyEditable,
-                                                  idx + mobj->propertyOffset(), argv);
+        QMetaObject::metacall(const_cast<QObject*>(object), QMetaObject::QueryPropertyEditable,
+                              idx + mobj->propertyOffset(), argv);
     }
     return b;
 }
diff --git a/src/corelib/kernel/qobject.cpp b/src/corelib/kernel/qobject.cpp
index b0ddd81..ab91799 100644
--- a/src/corelib/kernel/qobject.cpp
+++ b/src/corelib/kernel/qobject.cpp
@@ -145,11 +145,13 @@ QObjectPrivate::QObjectPrivate(int version)
     inThreadChangeEvent = false;
     deleteWatch = 0;
     objectGuards = 0;
+    metaObject = 0;
     hasGuards = false;
 }
 
 QObjectPrivate::~QObjectPrivate()
 {
+    delete static_cast<QAbstractDynamicMetaObject*>(metaObject);
     if (deleteWatch)
         *deleteWatch = 1;
 #ifndef QT_NO_USERDATA
@@ -484,7 +486,7 @@ QMetaCallEvent::~QMetaCallEvent()
  */
 int QMetaCallEvent::placeMetaCall(QObject *object)
 {
-    return object->qt_metacall(QMetaObject::InvokeMetaMethod, id_, args_);
+    return QMetaObject::metacall(object, QMetaObject::InvokeMetaMethod, id_, args_);
 }
 
 /*!
@@ -3171,10 +3173,10 @@ void QMetaObject::activate(QObject *sender, int from_signal_index, int to_signal
             }
 
 #if defined(QT_NO_EXCEPTIONS)
-            receiver->qt_metacall(QMetaObject::InvokeMetaMethod, method, argv ? argv : empty_argv);
+            metacall(receiver, QMetaObject::InvokeMetaMethod, method, argv ? argv : empty_argv);
 #else
             try {
-                receiver->qt_metacall(QMetaObject::InvokeMetaMethod, method, argv ? argv : empty_argv);
+                metacall(receiver, QMetaObject::InvokeMetaMethod, method, argv ? argv : empty_argv);
             } catch (...) {
                 locker.relock();
 
@@ -3917,6 +3919,7 @@ void qDeleteInEventHandler(QObject *o)
     delete o;
 }
 
+
 QT_END_NAMESPACE
 
 #include "moc_qobject.cpp"
diff --git a/src/corelib/kernel/qobject.h b/src/corelib/kernel/qobject.h
index 4715626..9169a90 100644
--- a/src/corelib/kernel/qobject.h
+++ b/src/corelib/kernel/qobject.h
@@ -109,6 +109,7 @@ public:
     uint hasGuards : 1; //true iff there is one or more QPointer attached to this object
     uint unused : 22;
     int postedEvents;
+    QMetaObject *metaObject; // assert dynamic
 };
 
 
diff --git a/src/corelib/kernel/qobject_p.h b/src/corelib/kernel/qobject_p.h
index 19df642..e908753 100644
--- a/src/corelib/kernel/qobject_p.h
+++ b/src/corelib/kernel/qobject_p.h
@@ -256,6 +256,14 @@ private:
 
 void Q_CORE_EXPORT qDeleteInEventHandler(QObject *o);
 
+
+struct Q_CORE_EXPORT QAbstractDynamicMetaObject : public QMetaObject
+{
+    virtual ~QAbstractDynamicMetaObject() {}
+    virtual int metaCall(QMetaObject::Call, int _id, void **) { return _id; }
+    virtual int createProperty(const char *, const char *) { return -1; }
+};
+
 QT_END_NAMESPACE
 
 #endif // QOBJECT_P_H
diff --git a/src/corelib/kernel/qobjectdefs.h b/src/corelib/kernel/qobjectdefs.h
index 300e9fa..1ae46d5 100644
--- a/src/corelib/kernel/qobjectdefs.h
+++ b/src/corelib/kernel/qobjectdefs.h
@@ -431,6 +431,7 @@ struct Q_CORE_EXPORT QMetaObject
     };
 
     int static_metacall(Call, int, void **) const;
+    static int metacall(QObject *, Call, int, void **);
 
 #ifdef QT3_SUPPORT
     QT3_SUPPORT const char *superClassName() const;
@@ -442,6 +443,7 @@ struct Q_CORE_EXPORT QMetaObject
         const uint *data;
         const void *extradata;
     } d;
+
 };
 
 struct QMetaObjectExtraData