1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
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 "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
|
