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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++ // Qt-Security score:significant
++
++ #include "qv4compilationunitmapper_p.h"
++
++ #include <private/qv4compileddata_p.h>
++
++ #include <QtCore/qdatetime.h>
++ #include <QtCore/qmutex.h>
++ #include <QtCore/qhash.h>
++
++ QT_BEGIN_NAMESPACE
++
++ using namespace QV4;
++
++ class StaticUnitCache
++ {
++ public:
++ StaticUnitCache() : m_lock(&s_mutex) {}
++
++ CompilationUnitMapper get(const QString &file)
++ {
++ const auto it = s_staticUnits.constFind(file);
++ return it == s_staticUnits.constEnd() ? CompilationUnitMapper() : *it;
++ }
++
++ void set(const QString &file, const CompilationUnitMapper &staticUnit) {
++ s_staticUnits.insert(file, staticUnit);
++ }
++
++ void remove(const QString &file)
++ {
++ s_staticUnits.remove(file);
++ }
++
++ private:
++ QMutexLocker<QMutex> m_lock;
++
++ static QMutex s_mutex;
++
++ // We can copy the mappers around because they're all static.
++ // We never unmap the files.
++ static QHash<QString, CompilationUnitMapper> s_staticUnits;
++ };
++
++ QHash<QString, CompilationUnitMapper> StaticUnitCache::s_staticUnits;
++ QMutex StaticUnitCache::s_mutex;
++
++ CompiledData::Unit *CompilationUnitMapper::get(
++ const QString &cacheFilePath, const QDateTime &sourceTimeStamp, QString *errorString)
++ {
++ StaticUnitCache cache;
++
++ CompilationUnitMapper mapper = cache.get(cacheFilePath);
++ if (mapper.dataPtr) {
++ auto *unit = reinterpret_cast<CompiledData::Unit *>(mapper.dataPtr);
++ if (unit->verifyHeader(sourceTimeStamp, errorString)) {
++ *this = mapper;
++ return unit;
++ }
++
++ return nullptr;
++ }
++
++ CompiledData::Unit *data = open(cacheFilePath, sourceTimeStamp, errorString);
++ if (data && (data->flags & CompiledData::Unit::StaticData)) {
++ cache.set(cacheFilePath, *this);
++ return data;
++ } else {
++ close();
++ return nullptr;
++ }
++ }
++
++ void CompilationUnitMapper::invalidate(const QString &cacheFilePath)
++ {
++ StaticUnitCache cache;
++ cache.remove(cacheFilePath);
++ }
++
++ QT_END_NAMESPACE