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
|
/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the V4VM 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QV4EXECUTABLEALLOCATOR_H
#define QV4EXECUTABLEALLOCATOR_H
#include "qv4global_p.h"
#include <QMultiMap>
#include <QHash>
#include <QVector>
namespace WTF {
struct PageAllocation;
};
QT_BEGIN_NAMESPACE
namespace QQmlJS {
namespace VM {
class Q_AUTOTEST_EXPORT ExecutableAllocator
{
struct ChunkOfPages;
public:
struct Allocation;
~ExecutableAllocator();
Allocation *allocate(size_t size);
void free(Allocation *allocation);
struct Allocation
{
Allocation()
: addr(0)
, size(0)
, free(true)
, next(0)
, prev(0)
{}
void *start() const;
private:
friend class ExecutableAllocator;
Allocation *split(size_t dividingSize);
bool mergeNext(ExecutableAllocator *allocator);
bool mergePrevious(ExecutableAllocator *allocator);
quintptr addr;
uint size : 31; // More than 2GB of function code? nah :)
uint free : 1;
Allocation *next;
Allocation *prev;
};
// for debugging / unit-testing
int freeAllocationCount() const { return freeAllocations.count(); }
int chunkCount() const { return chunks.count(); }
private:
struct ChunkOfPages
{
~ChunkOfPages();
WTF::PageAllocation *pages;
Allocation *firstAllocation;
bool contains(Allocation *alloc) const;
};
QMultiMap<size_t, Allocation*> freeAllocations;
QMap<quintptr, ChunkOfPages*> chunks;
};
} // namespace VM
} // namespace QQmlJS
QT_END_NAMESPACE
#endif // QV4EXECUTABLEALLOCATOR_H
|
