--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/xmlpatterns/expr/qcalltargetdescription.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,107 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtXmlPatterns module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qcallsite_p.h"
+
+#include "qcalltargetdescription_p.h"
+
+QT_BEGIN_NAMESPACE
+
+using namespace QPatternist;
+
+CallTargetDescription::CallTargetDescription(const QXmlName &name) : m_name(name)
+{
+    Q_ASSERT(!m_name.isNull());
+}
+
+QXmlName CallTargetDescription::name() const
+{
+    return m_name;
+}
+
+void CallTargetDescription::checkArgumentsCircularity(CallTargetDescription::List &signList,
+                                                      const Expression::Ptr callsite)
+{
+    /* Check the arguments. */
+    const Expression::List ops(callsite->operands());
+    const Expression::List::const_iterator end(ops.constEnd());
+    Expression::List::const_iterator it(ops.constBegin());
+
+    for(; it != end; ++it)
+        checkCallsiteCircularity(signList, *it);
+}
+
+void CallTargetDescription::checkCallsiteCircularity(CallTargetDescription::List &signList,
+                                                     const Expression::Ptr expr)
+{
+    Q_ASSERT(expr);
+
+    if(expr->is(Expression::IDUserFunctionCallsite))
+    {
+        CallTargetDescription::List::const_iterator it(signList.constBegin());
+        const CallTargetDescription::List::const_iterator end(signList.constEnd());
+        CallSite *const callsite = static_cast<CallSite *>(expr.data());
+
+        for(; it != end; ++it)
+        {
+            if(callsite->configureRecursion(*it))
+            {
+                /* A callsite inside the function body to the function. This user function
+                 * is recursive if it's to the same function, in other words. Which it was
+                 * if configureRecursion() returned true. */
+
+                /* Now we continue and check the arguments of the callsite. That is, the arguments.
+                 * This catches for instance local:foo(local:foo(3)). */
+                checkArgumentsCircularity(signList, expr);
+                return;
+            }
+        }
+        /* Check the body of the function so this callsite isn't "indirectly" a
+         * recursive call to the function we're checking. XQTS test case
+         * default_namespace-011 is an example of this. */
+        signList.append(callsite->callTargetDescription());
+        checkCallsiteCircularity(signList, callsite->body());
+    }
+
+    checkArgumentsCircularity(signList, expr); /* We're done in this case. */
+}
+
+QT_END_NAMESPACE