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diff --git a/src/qml/jsruntime/qv4jscall_p.h b/src/qml/jsruntime/qv4jscall_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef QV4JSCALL_H
+#define QV4JSCALL_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qv4object_p.h"
+#include "qv4function_p.h"
+#include "qv4functionobject_p.h"
+#include "qv4context_p.h"
+#include "qv4scopedvalue_p.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+
+struct JSCallData {
+    JSCallData(const Scope &scope, int argc = 0, const Value *argv = 0, const Value *thisObject = 0)
+        : scope(scope), argc(argc)
+    {
+        if (thisObject)
+            this->thisObject = const_cast<Value *>(thisObject);
+        else
+            this->thisObject = scope.alloc(1);
+        if (argv)
+            this->args = const_cast<Value *>(argv);
+        else
+            this->args = scope.alloc(argc);
+    }
+
+    JSCallData *operator->() {
+        return this;
+    }
+
+    CallData *callData(const FunctionObject *f = nullptr) const {
+        int size = int(offsetof(QV4::CallData, args)/sizeof(QV4::Value)) + argc;
+        CallData *ptr = reinterpret_cast<CallData *>(scope.engine->jsStackTop);
+        scope.engine->jsStackTop += size;
+        ptr->function = Encode::undefined();
+        ptr->context = Encode::undefined();
+        ptr->accumulator = Encode::undefined();
+        ptr->thisObject = thisObject->asReturnedValue();
+        ptr->setArgc(argc);
+        if (argc)
+            memcpy(ptr->args, args, argc*sizeof(Value));
+        if (f)
+            ptr->function = f->asReturnedValue();
+        return ptr;
+    }
+    const Scope &scope;
+    int argc;
+    Value *args;
+    Value *thisObject;
+};
+
+inline
+ReturnedValue FunctionObject::callAsConstructor(const JSCallData &data) const
+{
+    return d()->jsConstruct(this, data.args, data.argc);
+}
+
+inline
+ReturnedValue FunctionObject::call(const JSCallData &data) const
+{
+    return d()->jsCall(this, data.thisObject, data.args, data.argc);
+}
+
+
+struct ScopedStackFrame {
+    Scope &scope;
+    CppStackFrame frame;
+
+    ScopedStackFrame(Scope &scope, Heap::ExecutionContext *context)
+        : scope(scope)
+    {
+        frame.parent = scope.engine->currentStackFrame;
+        if (!context)
+            return;
+        frame.jsFrame = reinterpret_cast<CallData *>(scope.alloc(sizeof(CallData)/sizeof(Value)));
+        frame.jsFrame->context = context;
+        frame.v4Function = frame.parent ? frame.parent->v4Function : 0;
+        scope.engine->currentStackFrame = &frame;
+    }
+    ~ScopedStackFrame() {
+        scope.engine->currentStackFrame = frame.parent;
+    }
+};
+
+}
+
+QT_END_NAMESPACE
+
+#endif // QV4JSCALL_H