Fix crash in dumpcpp-generated code

QWidget/QObject were generated as base classes for the generated class,
which is no longer correct after the introduction of the
QAxBaseWidget/Object classes. Pass the correct base QMetaObject and
simplify the code since there is always a base class now.

Pick-to: 6.1
Change-Id: I822f2de4ce65785cd45dc3b4adf1923efae556be
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

3 files changed, 15 insertions, 24 deletions

diff --git a/tools/dumpcpp/main.cpp b/tools/dumpcpp/main.cpp
index a7dbbea..092a3c0 100644
--- a/tools/dumpcpp/main.cpp
+++ b/tools/dumpcpp/main.cpp
@@ -29,6 +29,7 @@
 #include "moc.h"
 
 #include <QAxObject>
+#include <QAxBaseWidget>
 #include <QFile>
 #include <QMetaObject>
 #include <QMetaEnum>
@@ -41,7 +42,6 @@
 #include <QCoreApplication>
 #include <QCommandLineOption>
 #include <QCommandLineParser>
-#include <QWidget>
 #include <QFileInfo>
 #include <qt_windows.h>
 #include <ocidl.h>
@@ -549,7 +549,6 @@ bool generateClassImpl(QTextStream &out, const QMetaObject *mo, const QByteArray
     qualifiedClassName += className;
 
     const QString moCode = mocCode(mo, QLatin1String(qualifiedClassName),
-                                   category.testFlag(ActiveX) ? QLatin1String("QWidget") : QLatin1String("QObject"),
                                    errorString);
     if (moCode.isEmpty()) {
         out << "#error moc error\n";
@@ -615,6 +614,13 @@ static void writeForwardDeclaration(QTextStream &declOut, const QByteArray &clas
     }
 }
 
+static const QMetaObject *baseMetaObject(ObjectCategories c)
+{
+    return c.testFlag(ActiveX)
+        ? &QAxBaseWidget::staticMetaObject
+        : &QAxBaseObject::staticMetaObject;
+}
+
 bool generateTypeLibrary(QString typeLibFile, QString outname,
                          const QString &nameSpace, ObjectCategories category)
 {
@@ -726,16 +732,10 @@ bool generateTypeLibrary(QString typeLibFile, QString outname,
                 // trigger meta object to collect references to other type libraries
                 switch (typekind) {
                 case TKIND_COCLASS:
-                    if (category & ActiveX)
-                        metaObject = qax_readClassInfo(typelib, typeinfo, &QWidget::staticMetaObject);
-                    else
-                        metaObject = qax_readClassInfo(typelib, typeinfo, &QObject::staticMetaObject);
+                    metaObject = qax_readClassInfo(typelib, typeinfo, baseMetaObject(category));
                     break;
                 case TKIND_DISPATCH:
-                    if (category & ActiveX)
-                        metaObject = qax_readInterfaceInfo(typelib, typeinfo, &QWidget::staticMetaObject);
-                    else
-                        metaObject = qax_readInterfaceInfo(typelib, typeinfo, &QObject::staticMetaObject);
+                    metaObject = qax_readInterfaceInfo(typelib, typeinfo, baseMetaObject(category));
                     break;
                 case TKIND_RECORD:
                 case TKIND_ENUM:
@@ -864,16 +864,10 @@ bool generateTypeLibrary(QString typeLibFile, QString outname,
 
         switch (typekind) {
         case TKIND_COCLASS:
-            if (object_category & ActiveX)
-                metaObject = qax_readClassInfo(typelib, typeinfo, &QWidget::staticMetaObject);
-            else
-                metaObject = qax_readClassInfo(typelib, typeinfo, &QObject::staticMetaObject);
+            metaObject = qax_readClassInfo(typelib, typeinfo, baseMetaObject(object_category));
             break;
         case TKIND_DISPATCH:
-            if (object_category & ActiveX)
-                metaObject = qax_readInterfaceInfo(typelib, typeinfo, &QWidget::staticMetaObject);
-            else
-                metaObject = qax_readInterfaceInfo(typelib, typeinfo, &QObject::staticMetaObject);
+            metaObject = qax_readInterfaceInfo(typelib, typeinfo, baseMetaObject(object_category));
             break;
         case TKIND_INTERFACE: { // only stub: QTBUG-27792, explicitly disable copy in inherited
                                 // class to make related error messages clearer
diff --git a/tools/dumpcpp/moc.cpp b/tools/dumpcpp/moc.cpp
index e405b0a..f4747f3 100644
--- a/tools/dumpcpp/moc.cpp
+++ b/tools/dumpcpp/moc.cpp
@@ -262,16 +262,13 @@ static QString cleanCode(QString code, const QString &className, const QString &
 }
 
 QString mocCode(const QMetaObject *mo, const QString &qualifiedClassName,
-                QString baseClass, QString *errorString)
+                QString *errorString)
 {
     QStringList name = qualifiedClassName.split(QLatin1String("::"));
     if (name.isEmpty())
         name.append(QLatin1String(mo->className()));
 
-    if (baseClass.isEmpty()) {
-        if (const auto sc = mo->superClass())
-            baseClass = QLatin1String(sc->className());
-    }
+    const QString baseClass = QLatin1String(mo->superClass()->className());
 
     const QString tempPattern = QDir::tempPath() + QLatin1Char('/')
         + name.constLast().toLower() + QLatin1String("_XXXXXX.h");
diff --git a/tools/dumpcpp/moc.h b/tools/dumpcpp/moc.h
index 30a5030..0222615 100644
--- a/tools/dumpcpp/moc.h
+++ b/tools/dumpcpp/moc.h
@@ -41,7 +41,7 @@ QByteArray setterName(const QByteArray &propertyName);
 void formatCppEnum(QTextStream &str, const QMetaEnum &metaEnum);
 
 QString mocCode(const QMetaObject *, const QString &qualifiedClassName,
-                QString baseClass, QString *errorString);
+                QString *errorString);
 
 QT_END_NAMESPACE