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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** 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 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 General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** 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-3.0.html.
**
****************************************************************************/
#pragma once
#include <QHash>
#include <QStack>
namespace Valgrind::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 = 0;
int m_cycle = 0;
};
} // namespace Internal
} // namespace Valgrind::Callgrind
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