1/*
2 * Copyright (C) 2009 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "DefinePropertyAttributes.h"
29#include "JSCJSValue.h"
30
31namespace JSC {
32
33class GetterSetter;
34
35class PropertyDescriptor {
36public:
37 PropertyDescriptor()
38 : m_attributes(defaultAttributes)
39 , m_seenAttributes(0)
40 {
41 }
42 PropertyDescriptor(JSValue value, unsigned attributes)
43 : m_value(value)
44 , m_attributes(attributes)
45 , m_seenAttributes(EnumerablePresent | ConfigurablePresent | WritablePresent)
46 {
47 ASSERT(m_value);
48 ASSERT(!m_value.isGetterSetter());
49 ASSERT(!m_value.isCustomGetterSetter());
50 }
51 JS_EXPORT_PRIVATE bool writable() const;
52 JS_EXPORT_PRIVATE bool enumerable() const;
53 JS_EXPORT_PRIVATE bool configurable() const;
54 JS_EXPORT_PRIVATE bool isDataDescriptor() const;
55 bool isGenericDescriptor() const;
56 JS_EXPORT_PRIVATE bool isAccessorDescriptor() const;
57 unsigned attributes() const { return m_attributes; }
58 JSValue value() const { return m_value; }
59 GetterSetter* slowGetterSetter(JSGlobalObject*); // Be aware that this will lazily allocate a GetterSetter object. It's much better to use getter() and setter() individually if possible.
60 JS_EXPORT_PRIVATE JSValue getter() const;
61 JS_EXPORT_PRIVATE JSValue setter() const;
62 JSObject* getterObject() const;
63 JSObject* setterObject() const;
64 JS_EXPORT_PRIVATE void setUndefined();
65 JS_EXPORT_PRIVATE void setDescriptor(JSValue, unsigned attributes);
66 JS_EXPORT_PRIVATE void setCustomDescriptor(unsigned attributes);
67 JS_EXPORT_PRIVATE void setAccessorDescriptor(GetterSetter* accessor, unsigned attributes);
68 JS_EXPORT_PRIVATE void setWritable(bool);
69 JS_EXPORT_PRIVATE void setEnumerable(bool);
70 JS_EXPORT_PRIVATE void setConfigurable(bool);
71 void setValue(JSValue value) { m_value = value; }
72 JS_EXPORT_PRIVATE void setSetter(JSValue);
73 JS_EXPORT_PRIVATE void setGetter(JSValue);
74 bool isEmpty() const { return !(m_value || m_getter || m_setter || m_seenAttributes); }
75 bool writablePresent() const { return m_seenAttributes & WritablePresent; }
76 bool enumerablePresent() const { return m_seenAttributes & EnumerablePresent; }
77 bool configurablePresent() const { return m_seenAttributes & ConfigurablePresent; }
78 bool setterPresent() const { return !!m_setter; }
79 bool getterPresent() const { return !!m_getter; }
80 bool equalTo(JSGlobalObject*, const PropertyDescriptor& other) const;
81 bool attributesEqual(const PropertyDescriptor& other) const;
82 unsigned attributesOverridingCurrent(const PropertyDescriptor& current) const;
83
84private:
85 JS_EXPORT_PRIVATE static unsigned defaultAttributes;
86 bool operator==(const PropertyDescriptor&) { return false; }
87 enum { WritablePresent = 1, EnumerablePresent = 2, ConfigurablePresent = 4};
88 // May be a getter/setter
89 JSValue m_value;
90 JSValue m_getter;
91 JSValue m_setter;
92 unsigned m_attributes;
93 unsigned m_seenAttributes;
94};
95
96inline PropertyDescriptor toPropertyDescriptor(JSValue value, JSValue getter, JSValue setter, DefinePropertyAttributes attributes)
97{
98 // We assume that validation is already done.
99 PropertyDescriptor desc;
100
101 if (Optional<bool> enumerable = attributes.enumerable())
102 desc.setEnumerable(enumerable.value());
103
104 if (Optional<bool> configurable = attributes.configurable())
105 desc.setConfigurable(configurable.value());
106
107 if (attributes.hasValue())
108 desc.setValue(value);
109
110 if (Optional<bool> writable = attributes.writable())
111 desc.setWritable(writable.value());
112
113 if (attributes.hasGet())
114 desc.setGetter(getter);
115
116 if (attributes.hasSet())
117 desc.setSetter(setter);
118
119 return desc;
120}
121
122}
123