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
|
/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QV4HEAP_P_H
#define QV4HEAP_P_H
#include <QtCore/QString>
#include <private/qv4global_p.h>
QT_BEGIN_NAMESPACE
namespace QV4 {
struct VTable
{
const VTable * const parent;
uint isExecutionContext : 1;
uint isString : 1;
uint isObject : 1;
uint isFunctionObject : 1;
uint isErrorObject : 1;
uint isArrayData : 1;
uint unused : 18;
uint type : 8;
const char *className;
void (*destroy)(Heap::Base *);
void (*markObjects)(Heap::Base *, ExecutionEngine *e);
bool (*isEqualTo)(Managed *m, Managed *other);
};
namespace Heap {
struct Q_QML_EXPORT Base {
quintptr mm_data; // vtable and markbit
inline ReturnedValue asReturnedValue() const;
inline void mark(QV4::ExecutionEngine *engine);
enum {
MarkBit = 0x1,
NotInUse = 0x2,
PointerMask = ~0x3
};
void setVtable(const VTable *v) {
Q_ASSERT(!(mm_data & MarkBit));
mm_data = reinterpret_cast<quintptr>(v);
}
VTable *vtable() const {
return reinterpret_cast<VTable *>(mm_data & PointerMask);
}
inline bool isMarked() const {
return mm_data & MarkBit;
}
inline void setMarkBit() {
mm_data |= MarkBit;
}
inline void clearMarkBit() {
mm_data &= ~MarkBit;
}
inline bool inUse() const {
return !(mm_data & NotInUse);
}
Base *nextFree() {
return reinterpret_cast<Base *>(mm_data & PointerMask);
}
void setNextFree(Base *m) {
mm_data = (reinterpret_cast<quintptr>(m) | NotInUse);
}
void *operator new(size_t, Managed *m) { return m; }
void *operator new(size_t, Heap::Base *m) { return m; }
void operator delete(void *, Heap::Base *) {}
};
template <typename T>
struct Pointer {
Pointer() {}
Pointer(T *t) : ptr(t) {}
T *operator->() const { return ptr; }
operator T *() const { return ptr; }
Pointer &operator =(T *t) { ptr = t; return *this; }
template <typename Type>
Type *cast() { return static_cast<Type *>(ptr); }
T *ptr;
};
}
}
QT_END_NAMESPACE
#endif
|
