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diff --git a/src/qml/jsruntime/qv4argumentsobject.cpp b/src/qml/jsruntime/qv4argumentsobject.cpp
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+++ b/src/qml/jsruntime/qv4argumentsobject.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include <qv4argumentsobject_p.h>
+
+using namespace QV4;
+
+static Value throwTypeError(SimpleCallContext *ctx)
+{
+    ctx->throwTypeError();
+    return Value::undefinedValue();
+}
+
+DEFINE_MANAGED_VTABLE(ArgumentsObject);
+
+ArgumentsObject::ArgumentsObject(CallContext *context, int formalParameterCount, int actualParameterCount)
+    : Object(context->engine), context(context)
+{
+    vtbl = &static_vtbl;
+    type = Type_ArgumentsObject;
+
+    defineDefaultProperty(context->engine->id_length, Value::fromInt32(actualParameterCount));
+    if (context->strictMode) {
+        for (uint i = 0; i < context->argumentCount; ++i)
+            Object::put(context, QString::number(i), context->arguments[i]);
+        FunctionObject *thrower = context->engine->newBuiltinFunction(context, 0, throwTypeError);
+        Property pd = Property::fromAccessor(thrower, thrower);
+        __defineOwnProperty__(context, QStringLiteral("callee"), pd, Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable);
+        __defineOwnProperty__(context, QStringLiteral("caller"), pd, Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable);
+    } else {
+        uint numAccessors = qMin(formalParameterCount, actualParameterCount);
+        context->engine->requireArgumentsAccessors(numAccessors);
+        for (uint i = 0; i < (uint)numAccessors; ++i) {
+            mappedArguments.append(context->argument(i));
+            __defineOwnProperty__(context, i, context->engine->argumentsAccessors.at(i), Attr_Accessor);
+        }
+        for (uint i = numAccessors; i < qMin((uint)actualParameterCount, context->argumentCount); ++i) {
+            Property pd = Property::fromValue(context->argument(i));
+            __defineOwnProperty__(context, i, pd, Attr_Data);
+        }
+        defineDefaultProperty(context, QStringLiteral("callee"), Value::fromObject(context->function));
+        isNonStrictArgumentsObject = true;
+    }
+}
+
+void ArgumentsObject::destroy(Managed *that)
+{
+    static_cast<ArgumentsObject *>(that)->~ArgumentsObject();
+}
+
+bool ArgumentsObject::defineOwnProperty(ExecutionContext *ctx, uint index, const Property &desc, PropertyAttributes attrs)
+{
+    uint pidx = propertyIndexFromArrayIndex(index);
+    Property *pd = arrayData + pidx;
+    Property map;
+    PropertyAttributes mapAttrs;
+    bool isMapped = false;
+    if (pd && index < (uint)mappedArguments.size())
+        isMapped = arrayAttributes && arrayAttributes[pidx].isAccessor() && pd->getter() == context->engine->argumentsAccessors.at(index).getter();
+
+    if (isMapped) {
+        map = *pd;
+        mapAttrs = arrayAttributes[pidx];
+        arrayAttributes[pidx] = Attr_Data;
+        pd->value = mappedArguments.at(index);
+    }
+
+    isNonStrictArgumentsObject = false;
+    bool strict = ctx->strictMode;
+    ctx->strictMode = false;
+    bool result = Object::__defineOwnProperty__(ctx, index, desc, attrs);
+    ctx->strictMode = strict;
+    isNonStrictArgumentsObject = true;
+
+    if (isMapped && attrs.isData()) {
+        if (!attrs.isGeneric()) {
+            Value arg = desc.value;
+            map.setter()->call(Value::fromObject(this), &arg, 1);
+        }
+        if (attrs.isWritable()) {
+            *pd = map;
+            arrayAttributes[pidx] = mapAttrs;
+        }
+    }
+
+    if (ctx->strictMode && !result)
+        ctx->throwTypeError();
+    return result;
+}
+
+DEFINE_MANAGED_VTABLE(ArgumentsGetterFunction);
+
+Value ArgumentsGetterFunction::call(Managed *getter, const Value &thisObject, Value *, int)
+{
+    ArgumentsGetterFunction *g = static_cast<ArgumentsGetterFunction *>(getter);
+    Object *that = thisObject.asObject();
+    if (!that)
+        getter->engine()->current->throwTypeError();
+    ArgumentsObject *o = that->asArgumentsObject();
+    if (!o)
+        getter->engine()->current->throwTypeError();
+
+    assert(g->index < o->context->argumentCount);
+    return o->context->argument(g->index);
+}
+
+DEFINE_MANAGED_VTABLE(ArgumentsSetterFunction);
+
+Value ArgumentsSetterFunction::call(Managed *setter, const Value &thisObject, Value *args, int argc)
+{
+    ArgumentsSetterFunction *s = static_cast<ArgumentsSetterFunction *>(setter);
+    Object *that = thisObject.asObject();
+    if (!that)
+        setter->engine()->current->throwTypeError();
+    ArgumentsObject *o = that->asArgumentsObject();
+    if (!o)
+        setter->engine()->current->throwTypeError();
+
+    assert(s->index < o->context->argumentCount);
+    o->context->arguments[s->index] = argc ? args[0] : Value::undefinedValue();
+    return Value::undefinedValue();
+}
+
+void ArgumentsObject::markObjects(Managed *that)
+{
+    ArgumentsObject *o = static_cast<ArgumentsObject *>(that);
+    o->context->mark();
+    for (int i = 0; i < o->mappedArguments.size(); ++i) {
+        Managed *m = o->mappedArguments.at(i).asManaged();
+        if (m)
+            m->mark();
+    }
+    Object::markObjects(that);
+}