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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 Qt Creator.
**
** 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.
**
****************************************************************************/
#ifndef LIBVALGRIND_CALLGRINDCYCLEDETECTION_H
#define LIBVALGRIND_CALLGRINDCYCLEDETECTION_H
#include <QHash>
#include <QStack>
namespace Valgrind {
namespace Callgrind {
class Function;
class ParseData;
namespace Internal {
/**
* Implementation of Tarjan's strongly connected components algorithm, to find function cycles,
* as suggested by the GProf paper:
*
* ``gprof: A Call Graph Execution Profiler'', by S. Graham, P. Kessler,
* M. McKusick; Proceedings of the SIGPLAN '82 Symposium on Compiler Construction,
* SIGPLAN Notices, Vol. 17, No 6, pp. 120-126, June 1982.
*/
class CycleDetection
{
public:
explicit CycleDetection(ParseData *data);
QVector<const Function *> run(const QVector<const Function *> &input);
private:
ParseData *m_data;
struct Node {
int dfs;
int lowlink;
const Function *function;
};
void tarjan(Node *node);
void tarjanForChildNode(Node *node, Node *childNode);
QHash<const Function *, Node *> m_nodes;
QStack<Node *> m_stack;
QVector<const Function *> m_ret;
int m_depth;
int m_cycle;
};
} // namespace Internal
} // namespace Callgrind
} // namespace Valgrind
#endif // LIBVALGRIND_CALLGRINDCYCLEDETECTION_H
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