1// Copyright 2015 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef V8_PROPERTY_DESCRIPTOR_H_
6#define V8_PROPERTY_DESCRIPTOR_H_
7
8
9#include "src/handles.h"
10#include "src/property-details.h"
11
12
13namespace v8 {
14namespace internal {
15
16class Isolate;
17class Object;
18
19class PropertyDescriptor {
20 public:
21  PropertyDescriptor()
22      : enumerable_(false),
23        has_enumerable_(false),
24        configurable_(false),
25        has_configurable_(false),
26        writable_(false),
27        has_writable_(false) {}
28
29  // ES6 6.2.4.1
30  static bool IsAccessorDescriptor(PropertyDescriptor* desc) {
31    return desc->has_get() || desc->has_set();
32  }
33
34  // ES6 6.2.4.2
35  static bool IsDataDescriptor(PropertyDescriptor* desc) {
36    return desc->has_value() || desc->has_writable();
37  }
38
39  // ES6 6.2.4.3
40  static bool IsGenericDescriptor(PropertyDescriptor* desc) {
41    return !IsAccessorDescriptor(desc) && !IsDataDescriptor(desc);
42  }
43
44  // ES6 6.2.4.4
45  Handle<Object> ToObject(Isolate* isolate);
46
47  // ES6 6.2.4.5
48  static bool ToPropertyDescriptor(Isolate* isolate, Handle<Object> obj,
49                                   PropertyDescriptor* desc);
50
51  // ES6 6.2.4.6
52  static void CompletePropertyDescriptor(Isolate* isolate,
53                                         PropertyDescriptor* desc);
54
55  bool is_empty() const {
56    return !has_enumerable() && !has_configurable() && !has_writable() &&
57           !has_value() && !has_get() && !has_set();
58  }
59
60  bool IsRegularAccessorProperty() const {
61    return has_configurable() && has_enumerable() && !has_value() &&
62           !has_writable() && has_get() && has_set();
63  }
64
65  bool IsRegularDataProperty() const {
66    return has_configurable() && has_enumerable() && has_value() &&
67           has_writable() && !has_get() && !has_set();
68  }
69
70  bool enumerable() const { return enumerable_; }
71  void set_enumerable(bool enumerable) {
72    enumerable_ = enumerable;
73    has_enumerable_ = true;
74  }
75  bool has_enumerable() const { return has_enumerable_; }
76
77  bool configurable() const { return configurable_; }
78  void set_configurable(bool configurable) {
79    configurable_ = configurable;
80    has_configurable_ = true;
81  }
82  bool has_configurable() const { return has_configurable_; }
83
84  Handle<Object> value() const { return value_; }
85  void set_value(Handle<Object> value) { value_ = value; }
86  bool has_value() const { return !value_.is_null(); }
87
88  bool writable() const { return writable_; }
89  void set_writable(bool writable) {
90    writable_ = writable;
91    has_writable_ = true;
92  }
93  bool has_writable() const { return has_writable_; }
94
95  Handle<Object> get() const { return get_; }
96  void set_get(Handle<Object> get) { get_ = get; }
97  bool has_get() const { return !get_.is_null(); }
98
99  Handle<Object> set() const { return set_; }
100  void set_set(Handle<Object> set) { set_ = set; }
101  bool has_set() const { return !set_.is_null(); }
102
103  Handle<Object> name() const { return name_; }
104  void set_name(Handle<Object> name) { name_ = name; }
105
106  PropertyAttributes ToAttributes() {
107    return static_cast<PropertyAttributes>(
108        (has_enumerable() && !enumerable() ? DONT_ENUM : NONE) |
109        (has_configurable() && !configurable() ? DONT_DELETE : NONE) |
110        (has_writable() && !writable() ? READ_ONLY : NONE));
111  }
112
113 private:
114  bool enumerable_ : 1;
115  bool has_enumerable_ : 1;
116  bool configurable_ : 1;
117  bool has_configurable_ : 1;
118  bool writable_ : 1;
119  bool has_writable_ : 1;
120  Handle<Object> value_;
121  Handle<Object> get_;
122  Handle<Object> set_;
123  Handle<Object> name_;
124
125  // Some compilers (Xcode 5.1, ARM GCC 4.9) insist on having a copy
126  // constructor for std::vector<PropertyDescriptor>, so we can't
127  // DISALLOW_COPY_AND_ASSIGN(PropertyDescriptor); here.
128};
129
130}  // namespace internal
131}  // namespace v8
132
133#endif  // V8_PROPERTY_DESCRIPTOR_H_
134