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      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 
     13 namespace v8 {
     14 namespace internal {
     15 
     16 class Isolate;
     17 class Object;
     18 class PropertyDescriptorObject;
     19 
     20 class PropertyDescriptor {
     21  public:
     22   PropertyDescriptor()
     23       : enumerable_(false),
     24         has_enumerable_(false),
     25         configurable_(false),
     26         has_configurable_(false),
     27         writable_(false),
     28         has_writable_(false) {}
     29 
     30   // ES6 6.2.4.1
     31   static bool IsAccessorDescriptor(PropertyDescriptor* desc) {
     32     return desc->has_get() || desc->has_set();
     33   }
     34 
     35   // ES6 6.2.4.2
     36   static bool IsDataDescriptor(PropertyDescriptor* desc) {
     37     return desc->has_value() || desc->has_writable();
     38   }
     39 
     40   // ES6 6.2.4.3
     41   static bool IsGenericDescriptor(PropertyDescriptor* desc) {
     42     return !IsAccessorDescriptor(desc) && !IsDataDescriptor(desc);
     43   }
     44 
     45   // ES6 6.2.4.4
     46   Handle<Object> ToObject(Isolate* isolate);
     47 
     48   Handle<PropertyDescriptorObject> ToPropertyDescriptorObject(Isolate* isolate);
     49 
     50   // ES6 6.2.4.5
     51   static bool ToPropertyDescriptor(Isolate* isolate, Handle<Object> obj,
     52                                    PropertyDescriptor* desc);
     53 
     54   // ES6 6.2.4.6
     55   static void CompletePropertyDescriptor(Isolate* isolate,
     56                                          PropertyDescriptor* desc);
     57 
     58   bool is_empty() const {
     59     return !has_enumerable() && !has_configurable() && !has_writable() &&
     60            !has_value() && !has_get() && !has_set();
     61   }
     62 
     63   bool IsRegularAccessorProperty() const {
     64     return has_configurable() && has_enumerable() && !has_value() &&
     65            !has_writable() && has_get() && has_set();
     66   }
     67 
     68   bool IsRegularDataProperty() const {
     69     return has_configurable() && has_enumerable() && has_value() &&
     70            has_writable() && !has_get() && !has_set();
     71   }
     72 
     73   bool enumerable() const { return enumerable_; }
     74   void set_enumerable(bool enumerable) {
     75     enumerable_ = enumerable;
     76     has_enumerable_ = true;
     77   }
     78   bool has_enumerable() const { return has_enumerable_; }
     79 
     80   bool configurable() const { return configurable_; }
     81   void set_configurable(bool configurable) {
     82     configurable_ = configurable;
     83     has_configurable_ = true;
     84   }
     85   bool has_configurable() const { return has_configurable_; }
     86 
     87   Handle<Object> value() const { return value_; }
     88   void set_value(Handle<Object> value) { value_ = value; }
     89   bool has_value() const { return !value_.is_null(); }
     90 
     91   bool writable() const { return writable_; }
     92   void set_writable(bool writable) {
     93     writable_ = writable;
     94     has_writable_ = true;
     95   }
     96   bool has_writable() const { return has_writable_; }
     97 
     98   Handle<Object> get() const { return get_; }
     99   void set_get(Handle<Object> get) { get_ = get; }
    100   bool has_get() const { return !get_.is_null(); }
    101 
    102   Handle<Object> set() const { return set_; }
    103   void set_set(Handle<Object> set) { set_ = set; }
    104   bool has_set() const { return !set_.is_null(); }
    105 
    106   Handle<Object> name() const { return name_; }
    107   void set_name(Handle<Object> name) { name_ = name; }
    108 
    109   PropertyAttributes ToAttributes() {
    110     return static_cast<PropertyAttributes>(
    111         (has_enumerable() && !enumerable() ? DONT_ENUM : NONE) |
    112         (has_configurable() && !configurable() ? DONT_DELETE : NONE) |
    113         (has_writable() && !writable() ? READ_ONLY : NONE));
    114   }
    115 
    116  private:
    117   bool enumerable_ : 1;
    118   bool has_enumerable_ : 1;
    119   bool configurable_ : 1;
    120   bool has_configurable_ : 1;
    121   bool writable_ : 1;
    122   bool has_writable_ : 1;
    123   Handle<Object> value_;
    124   Handle<Object> get_;
    125   Handle<Object> set_;
    126   Handle<Object> name_;
    127 
    128   // Some compilers (Xcode 5.1, ARM GCC 4.9) insist on having a copy
    129   // constructor for std::vector<PropertyDescriptor>, so we can't
    130   // DISALLOW_COPY_AND_ASSIGN(PropertyDescriptor); here.
    131 };
    132 
    133 }  // namespace internal
    134 }  // namespace v8
    135 
    136 #endif  // V8_PROPERTY_DESCRIPTOR_H_
    137