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| |
| #include "qv4compilationunitmapper_p.h" |
| |
| #include "qv4executablecompilationunit_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 (!ExecutableCompilationUnit::verifyHeader(&header, 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 |