diff options
Diffstat (limited to 'src/qml/jsruntime/qv4compilationunitmapper_win.cpp')
-rw-r--r-- | src/qml/jsruntime/qv4compilationunitmapper_win.cpp | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/src/qml/jsruntime/qv4compilationunitmapper_win.cpp b/src/qml/jsruntime/qv4compilationunitmapper_win.cpp new file mode 100644 index 0000000000..779c1288fe --- /dev/null +++ b/src/qml/jsruntime/qv4compilationunitmapper_win.cpp @@ -0,0 +1,128 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtQml module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** 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 Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** 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-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qv4compilationunitmapper_p.h" + +#include "qv4compileddata_p.h" +#include <QScopeGuard> +#include <QFileInfo> +#include <QDateTime> +#include <qt_windows.h> + +QT_BEGIN_NAMESPACE + +using namespace QV4; + +CompiledData::Unit *CompilationUnitMapper::open(const QString &cacheFileName, const QDateTime &sourceTimeStamp, QString *errorString) +{ + close(); + + // ### TODO: fix up file encoding/normalization/unc handling once QFileSystemEntry + // is exported from QtCore. + HANDLE handle = +#if defined(Q_OS_WINRT) + CreateFile2(reinterpret_cast<const wchar_t*>(cacheFileName.constData()), + GENERIC_READ | GENERIC_EXECUTE, FILE_SHARE_READ, + OPEN_EXISTING, nullptr); +#else + CreateFile(reinterpret_cast<const wchar_t*>(cacheFileName.constData()), + GENERIC_READ | GENERIC_EXECUTE, FILE_SHARE_READ, + nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, + nullptr); +#endif + if (handle == INVALID_HANDLE_VALUE) { + *errorString = qt_error_string(GetLastError()); + return nullptr; + } + + auto fileHandleCleanup = qScopeGuard([handle]{ + CloseHandle(handle); + }); + + CompiledData::Unit header; + DWORD bytesRead; + if (!ReadFile(handle, reinterpret_cast<char *>(&header), sizeof(header), &bytesRead, nullptr)) { + *errorString = qt_error_string(GetLastError()); + return nullptr; + } + + if (bytesRead != sizeof(header)) { + *errorString = QStringLiteral("File too small for the header fields"); + return nullptr; + } + + if (!header.verifyHeader(sourceTimeStamp, errorString)) + return nullptr; + + // Data structure and qt version matched, so now we can access the rest of the file safely. + + HANDLE fileMappingHandle = CreateFileMapping(handle, 0, PAGE_READONLY, 0, 0, 0); + if (!fileMappingHandle) { + *errorString = qt_error_string(GetLastError()); + return nullptr; + } + + auto mappingCleanup = qScopeGuard([fileMappingHandle]{ + CloseHandle(fileMappingHandle); + }); + + dataPtr = MapViewOfFile(fileMappingHandle, FILE_MAP_READ, 0, 0, 0); + if (!dataPtr) { + *errorString = qt_error_string(GetLastError()); + return nullptr; + } + + return reinterpret_cast<CompiledData::Unit*>(dataPtr); +} + +void CompilationUnitMapper::close() +{ + if (dataPtr != nullptr) { + // Do not unmap cache files that are built with the StaticData flag. That's the majority of + // them and it's necessary to benefit from the QString literal optimization. There might + // still be QString instances around that point into that memory area. The memory is backed + // on the disk, so the kernel is free to release the pages and all that remains is the + // address space allocation. + if (!(reinterpret_cast<CompiledData::Unit*>(dataPtr)->flags & CompiledData::Unit::StaticData)) + UnmapViewOfFile(dataPtr); + } + dataPtr = nullptr; +} + +QT_END_NAMESPACE |