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
129
130
131
132
133
134
135
136
137
138
139
|
/****************************************************************************
**
** 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 =
CreateFile(reinterpret_cast<const wchar_t*>(cacheFileName.constData()),
GENERIC_READ | GENERIC_EXECUTE, FILE_SHARE_READ,
nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
nullptr);
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.
/* Error out early on file corruption. We assume we can read header.unitSize bytes
later (even before verifying the checksum), potentially causing out-of-bound
reads
Also, no need to wait until checksum verification if we know beforehand
that the cached unit is bogus
*/
LARGE_INTEGER fileSize;
if (!GetFileSizeEx(handle, &fileSize)) {
*errorString = QStringLiteral("Could not determine file size");
return nullptr;
}
if (header.unitSize != fileSize.QuadPart) {
*errorString = QStringLiteral("Potential file corruption, file too small");
return nullptr;
}
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
|
