| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | |
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| 4 | #include "qv4compilationunitmapper_p.h" |
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| 5 | |
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| 6 | #include <private/qv4compileddata_p.h> |
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| 7 | |
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| 8 | #include <QtCore/qdatetime.h> |
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| 9 | #include <QtCore/qmutex.h> |
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| 10 | #include <QtCore/qhash.h> |
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| 11 | |
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| 12 | QT_BEGIN_NAMESPACE |
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| 13 | |
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| 14 | using namespace QV4; |
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| 15 | |
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| 16 | class StaticUnitCache |
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| 17 | { |
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| 18 | public: |
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| 19 | StaticUnitCache() : m_lock(&s_mutex) {} |
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| 20 | |
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| 21 | CompilationUnitMapper get(const QString &file) |
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| 22 | { |
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| 23 | const auto it = s_staticUnits.constFind(key: file); |
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| 24 | return it == s_staticUnits.constEnd() ? CompilationUnitMapper() : *it; |
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| 25 | } |
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| 26 | |
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| 27 | void set(const QString &file, const CompilationUnitMapper &staticUnit) { |
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| 28 | s_staticUnits.insert(key: file, value: staticUnit); |
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| 29 | } |
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| 30 | |
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| 31 | void remove(const QString &file) |
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| 32 | { |
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| 33 | s_staticUnits.remove(key: file); |
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| 34 | } |
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| 35 | |
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| 36 | private: |
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| 37 | QMutexLocker<QMutex> m_lock; |
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| 38 | |
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| 39 | static QMutex s_mutex; |
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| 40 | |
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| 41 | // We can copy the mappers around because they're all static. |
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| 42 | // We never unmap the files. |
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| 43 | static QHash<QString, CompilationUnitMapper> s_staticUnits; |
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| 44 | }; |
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| 45 | |
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| 46 | QHash<QString, CompilationUnitMapper> StaticUnitCache::s_staticUnits; |
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| 47 | QMutex StaticUnitCache::s_mutex; |
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| 48 | |
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| 49 | CompiledData::Unit *CompilationUnitMapper::get( |
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| 50 | const QString &cacheFilePath, const QDateTime &sourceTimeStamp, QString *errorString) |
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| 51 | { |
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| 52 | StaticUnitCache cache; |
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| 53 | |
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| 54 | CompilationUnitMapper mapper = cache.get(file: cacheFilePath); |
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| 55 | if (mapper.dataPtr) { |
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| 56 | auto *unit = reinterpret_cast<CompiledData::Unit *>(mapper.dataPtr); |
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| 57 | if (unit->verifyHeader(expectedSourceTimeStamp: sourceTimeStamp, errorString)) { |
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| 58 | *this = mapper; |
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| 59 | return unit; |
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| 60 | } |
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| 61 | |
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| 62 | return nullptr; |
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| 63 | } |
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| 64 | |
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| 65 | CompiledData::Unit *data = open(cacheFilePath, sourceTimeStamp, errorString); |
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| 66 | if (data && (data->flags & CompiledData::Unit::StaticData)) { |
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| 67 | cache.set(file: cacheFilePath, staticUnit: *this); |
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| 68 | return data; |
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| 69 | } else { |
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| 70 | close(); |
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| 71 | return nullptr; |
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| 72 | } |
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| 73 | } |
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| 74 | |
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| 75 | void CompilationUnitMapper::invalidate(const QString &cacheFilePath) |
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| 76 | { |
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| 77 | StaticUnitCache cache; |
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| 78 | cache.remove(file: cacheFilePath); |
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| 79 | } |
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| 80 | |
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| 81 | QT_END_NAMESPACE |
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| 82 | |
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