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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Build Suite.
**
** 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.
**
****************************************************************************/
#include "rulegraph.h"
#include <language/language.h>
#include <logging/translator.h>
#include <tools/error.h>
namespace qbs {
namespace Internal {
RuleGraph::RuleGraph()
{
}
void RuleGraph::build(const QSet<RulePtr> &rules, const FileTags &productFileTags)
{
QMap<FileTag, QList<const Rule *> > inputFileTagToRule;
m_artifacts.reserve(rules.count());
foreach (const RulePtr &rule, rules) {
foreach (const FileTag &fileTag, rule->outputFileTags())
m_outputFileTagToRule[fileTag].append(rule.data());
insert(rule);
}
m_parents.resize(rules.count());
m_children.resize(rules.count());
foreach (const RuleConstPtr &rule, m_artifacts) {
FileTags inFileTags = rule->inputs;
inFileTags += rule->auxiliaryInputs;
inFileTags += rule->explicitlyDependsOn;
foreach (const FileTag &fileTag, inFileTags) {
inputFileTagToRule[fileTag].append(rule.data());
foreach (const Rule * const consumingRule, m_outputFileTagToRule.value(fileTag)) {
connect(rule.data(), consumingRule);
}
}
}
QList<const Rule *> productRules;
foreach (const FileTag &productFileTag, productFileTags) {
QList<const Rule *> rules = m_outputFileTagToRule.value(productFileTag);
productRules += rules;
//### check: the rule graph must be a in valid shape!
}
foreach (const Rule *r, productRules)
m_rootRules += r->ruleGraphId;
}
QList<RuleConstPtr> RuleGraph::topSorted()
{
QSet<int> rootRules = m_rootRules;
QList<RuleConstPtr> result;
foreach (int rootIndex, rootRules) {
RuleConstPtr rule = m_artifacts.at(rootIndex);
QSet<const Rule *> seenRules;
QList<const Rule *> rulePath;
result.append(topSort(rule, &seenRules, &rulePath));
}
// remove duplicates from the result of our post-order traversal
QSet<const Rule*> seenRules;
seenRules.reserve(result.count());
for (int i = 0; i < result.count();) {
const Rule * const rule = result.at(i).data();
if (seenRules.contains(rule))
result.removeAt(i);
else
++i;
seenRules.insert(rule);
}
return result;
}
void RuleGraph::dump() const
{
QByteArray indent;
printf("---rule graph dump:\n");
QSet<int> rootRules;
foreach (const RuleConstPtr &rule, m_artifacts)
if (m_parents[rule->ruleGraphId].isEmpty())
rootRules += rule->ruleGraphId;
foreach (int idx, rootRules) {
dump_impl(indent, idx);
}
}
void RuleGraph::dump_impl(QByteArray &indent, int rootIndex) const
{
const RuleConstPtr r = m_artifacts[rootIndex];
printf("%s", indent.constData());
printf("%s", qPrintable(r->toString()));
printf("\n");
indent.append(" ");
foreach (int childIndex, m_children[rootIndex])
dump_impl(indent, childIndex);
indent.chop(2);
}
int RuleGraph::insert(const RulePtr &rule)
{
rule->ruleGraphId = m_artifacts.count();
m_artifacts.append(rule);
return rule->ruleGraphId;
}
void RuleGraph::connect(const Rule *creatingRule, const Rule *consumingRule)
{
int maxIndex = qMax(creatingRule->ruleGraphId, consumingRule->ruleGraphId);
if (m_parents.count() <= maxIndex) {
const int c = maxIndex + 1;
m_parents.resize(c);
m_children.resize(c);
}
m_parents[consumingRule->ruleGraphId].append(creatingRule->ruleGraphId);
m_children[creatingRule->ruleGraphId].append(consumingRule->ruleGraphId);
}
QList<RuleConstPtr> RuleGraph::topSort(const RuleConstPtr &rule, QSet<const Rule *> *seenRules,
QList<const Rule *> *rulePath)
{
if (seenRules->contains(rule.data())) {
QString pathstr;
foreach (const Rule *r, *rulePath) {
pathstr += QLatin1Char('\n') + r->toString() + QLatin1Char('\t')
+ r->script->location.toString();
}
throw ErrorInfo(Tr::tr("Cycle detected in rule dependencies: %1").arg(pathstr));
}
seenRules->insert(rule.data());
rulePath->prepend(rule.data());
QList<RuleConstPtr> result;
foreach (int childIndex, m_children.at(rule->ruleGraphId))
result.append(topSort(m_artifacts.at(childIndex), seenRules, rulePath));
result.append(rule);
seenRules->remove(rule.data());
rulePath->removeFirst();
return result;
}
} // namespace Internal
} // namespace qbs
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