1 // Copyright 2014 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_H_
6 #define V8_PROPERTY_H_
7 
8 #include <iosfwd>
9 
10 #include "src/factory.h"
11 #include "src/field-index.h"
12 #include "src/isolate.h"
13 #include "src/types.h"
14 
15 namespace v8 {
16 namespace internal {
17 
18 // Abstraction for elements in instance-descriptor arrays.
19 //
20 // Each descriptor has a key, property attributes, property type,
21 // property index (in the actual instance-descriptor array) and
22 // optionally a piece of data.
23 class Descriptor BASE_EMBEDDED {
24  public:
KeyToUniqueName()25   void KeyToUniqueName() {
26     if (!key_->IsUniqueName()) {
27       key_ = key_->GetIsolate()->factory()->InternalizeString(
28           Handle<String>::cast(key_));
29     }
30   }
31 
GetKey()32   Handle<Name> GetKey() const { return key_; }
GetValue()33   Handle<Object> GetValue() const { return value_; }
GetDetails()34   PropertyDetails GetDetails() const { return details_; }
35 
SetSortedKeyIndex(int index)36   void SetSortedKeyIndex(int index) { details_ = details_.set_pointer(index); }
37 
38  private:
39   Handle<Name> key_;
40   Handle<Object> value_;
41   PropertyDetails details_;
42 
43  protected:
Descriptor()44   Descriptor() : details_(Smi::FromInt(0)) {}
45 
Init(Handle<Name> key,Handle<Object> value,PropertyDetails details)46   void Init(Handle<Name> key, Handle<Object> value, PropertyDetails details) {
47     key_ = key;
48     value_ = value;
49     details_ = details;
50   }
51 
Descriptor(Handle<Name> key,Handle<Object> value,PropertyDetails details)52   Descriptor(Handle<Name> key, Handle<Object> value, PropertyDetails details)
53       : key_(key),
54         value_(value),
55         details_(details) { }
56 
57   Descriptor(Handle<Name> key,
58              Handle<Object> value,
59              PropertyAttributes attributes,
60              PropertyType type,
61              Representation representation,
62              int field_index = 0)
key_(key)63       : key_(key),
64         value_(value),
65         details_(attributes, type, representation, field_index) { }
66 
67   friend class DescriptorArray;
68   friend class Map;
69 };
70 
71 
72 std::ostream& operator<<(std::ostream& os, const Descriptor& d);
73 
74 
75 class DataDescriptor final : public Descriptor {
76  public:
DataDescriptor(Handle<Name> key,int field_index,PropertyAttributes attributes,Representation representation)77   DataDescriptor(Handle<Name> key, int field_index,
78                  PropertyAttributes attributes, Representation representation)
79       : Descriptor(key, HeapType::Any(key->GetIsolate()), attributes, DATA,
80                    representation, field_index) {}
81   // The field type is either a simple type or a map wrapped in a weak cell.
DataDescriptor(Handle<Name> key,int field_index,Handle<Object> wrapped_field_type,PropertyAttributes attributes,Representation representation)82   DataDescriptor(Handle<Name> key, int field_index,
83                  Handle<Object> wrapped_field_type,
84                  PropertyAttributes attributes, Representation representation)
85       : Descriptor(key, wrapped_field_type, attributes, DATA, representation,
86                    field_index) {
87     DCHECK(wrapped_field_type->IsSmi() || wrapped_field_type->IsWeakCell());
88   }
89 };
90 
91 
92 class DataConstantDescriptor final : public Descriptor {
93  public:
DataConstantDescriptor(Handle<Name> key,Handle<Object> value,PropertyAttributes attributes)94   DataConstantDescriptor(Handle<Name> key, Handle<Object> value,
95                          PropertyAttributes attributes)
96       : Descriptor(key, value, attributes, DATA_CONSTANT,
97                    value->OptimalRepresentation()) {}
98 };
99 
100 
101 class AccessorConstantDescriptor final : public Descriptor {
102  public:
AccessorConstantDescriptor(Handle<Name> key,Handle<Object> foreign,PropertyAttributes attributes)103   AccessorConstantDescriptor(Handle<Name> key, Handle<Object> foreign,
104                              PropertyAttributes attributes)
105       : Descriptor(key, foreign, attributes, ACCESSOR_CONSTANT,
106                    Representation::Tagged()) {}
107 };
108 
109 
110 }  // namespace internal
111 }  // namespace v8
112 
113 #endif  // V8_PROPERTY_H_
114