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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.
**
****************************************************************************/
#include "callgrindcycledetection.h"
#include "callgrindfunction.h"
#include "callgrindfunctioncall.h"
#include "callgrindparsedata.h"
#include "callgrindfunctioncycle.h"
#include <utils/qtcassert.h>
#include <QDebug>
namespace Valgrind::Callgrind::Internal {
CycleDetection::CycleDetection(ParseData *data)
: m_data(data)
{
}
QVector<const Function *> CycleDetection::run(const QVector<const Function *> &input)
{
for (const Function *function : input) {
Node *node = new Node;
node->function = function;
node->dfs = -1;
node->lowlink = -1;
m_nodes.insert(function, node);
}
for (Node *node : qAsConst(m_nodes)) {
if (node->dfs == -1)
tarjan(node);
}
qDeleteAll(m_nodes);
return m_ret;
}
void CycleDetection::tarjan(Node *node)
{
QTC_ASSERT(node->dfs == -1, return);
node->dfs = m_depth;
node->lowlink = m_depth;
m_depth++;
m_stack.push(node);
const QVector<const FunctionCall *> calls = node->function->outgoingCalls();
for (const FunctionCall *call : calls)
tarjanForChildNode(node, m_nodes.value(call->callee()));
if (node->dfs == node->lowlink) {
QVector<const Function *> functions;
Node *n;
do {
n = m_stack.pop();
functions << n->function;
} while (n != node);
if (functions.size() == 1) {
// not a real cycle
m_ret.append(node->function);
} else {
// actual cycle
auto cycle = new FunctionCycle(m_data);
cycle->setFile(node->function->fileId());
m_cycle++;
qint64 id = -1;
m_data->addCompressedFunction(QString::fromLatin1("cycle %1").arg(m_cycle), id);
cycle->setName(id);
cycle->setObject(node->function->objectId());
cycle->setFunctions(functions);
m_ret.append(cycle);
}
}
}
void CycleDetection::tarjanForChildNode(Node *node, Node *childNode)
{
if (childNode->dfs == -1) {
tarjan(childNode);
if (childNode->lowlink < node->lowlink)
node->lowlink = childNode->lowlink;
} else if (childNode->dfs < node->lowlink && m_stack.contains(childNode)) {
node->lowlink = childNode->dfs;
}
}
} // namespace Valgrind::Callgrind::Internal
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