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
|
/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2014 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef GetterSetter_h
#define GetterSetter_h
#include "JSCell.h"
#include "CallFrame.h"
#include "Structure.h"
namespace JSC {
class JSObject;
// This is an internal value object which stores getter and setter functions
// for a property. Instances of this class have the property that once a getter
// or setter is set to a non-null value, then they cannot be changed. This means
// that if a property holding a GetterSetter reference is constant-inferred and
// that constant is observed to have a non-null setter (or getter) then we can
// constant fold that setter (or getter).
class GetterSetter : public JSCell {
friend class JIT;
private:
GetterSetter(VM& vm)
: JSCell(vm, vm.getterSetterStructure.get())
{
}
public:
typedef JSCell Base;
static GetterSetter* create(VM& vm)
{
GetterSetter* getterSetter = new (NotNull, allocateCell<GetterSetter>(vm.heap)) GetterSetter(vm);
getterSetter->finishCreation(vm);
return getterSetter;
}
static void visitChildren(JSCell*, SlotVisitor&);
JSObject* getter() const { return m_getter.get(); }
JSObject* getterConcurrently() const
{
JSObject* result = getter();
WTF::loadLoadFence();
return result;
}
// Set the getter. It's only valid to call this if you've never set the getter on this
// object.
void setGetter(VM& vm, JSObject* getter)
{
RELEASE_ASSERT(!m_getter);
WTF::storeStoreFence();
m_getter.setMayBeNull(vm, this, getter);
}
JSObject* setter() const { return m_setter.get(); }
JSObject* setterConcurrently() const
{
JSObject* result = setter();
WTF::loadLoadFence();
return result;
}
// Set the setter. It's only valid to call this if you've never set the setter on this
// object.
void setSetter(VM& vm, JSObject* setter)
{
RELEASE_ASSERT(!m_setter);
WTF::storeStoreFence();
m_setter.setMayBeNull(vm, this, setter);
}
GetterSetter* withGetter(VM&, JSObject* getter);
GetterSetter* withSetter(VM&, JSObject* setter);
static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(GetterSetterType), info());
}
static ptrdiff_t offsetOfGetter()
{
return OBJECT_OFFSETOF(GetterSetter, m_getter);
}
static ptrdiff_t offsetOfSetter()
{
return OBJECT_OFFSETOF(GetterSetter, m_setter);
}
DECLARE_INFO;
private:
WriteBarrier<JSObject> m_getter;
WriteBarrier<JSObject> m_setter;
};
GetterSetter* asGetterSetter(JSValue);
inline GetterSetter* asGetterSetter(JSValue value)
{
ASSERT_WITH_SECURITY_IMPLICATION(value.asCell()->isGetterSetter());
return static_cast<GetterSetter*>(value.asCell());
}
JSValue callGetter(ExecState*, JSValue base, JSValue getterSetter);
void callSetter(ExecState*, JSValue base, JSValue getterSetter, JSValue, ECMAMode);
} // namespace JSC
#endif // GetterSetter_h
|
