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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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92 int index = 0) | 92 int index = 0) |
93 : key_(key), | 93 : key_(key), |
94 value_(value), | 94 value_(value), |
95 details_(attributes, type, index) { } | 95 details_(attributes, type, index) { } |
96 | 96 |
97 friend class DescriptorWriter; | 97 friend class DescriptorWriter; |
98 friend class DescriptorReader; | 98 friend class DescriptorReader; |
99 friend class DescriptorArray; | 99 friend class DescriptorArray; |
100 }; | 100 }; |
101 | 101 |
102 // A pointer from a map to the new map that is created by adding | 102 |
103 // a named property. These are key to the speed and functioning of V8. | |
104 // The two maps should always have the same prototype, since | |
105 // MapSpace::CreateBackPointers depends on this. | |
106 class MapTransitionDescriptor: public Descriptor { | 103 class MapTransitionDescriptor: public Descriptor { |
107 public: | 104 public: |
108 MapTransitionDescriptor(String* key, Map* map, PropertyAttributes attributes) | 105 MapTransitionDescriptor(String* key, Map* map, PropertyAttributes attributes) |
109 : Descriptor(key, map, attributes, MAP_TRANSITION) { } | 106 : Descriptor(key, map, attributes, MAP_TRANSITION) { } |
110 }; | 107 }; |
111 | 108 |
112 // Marks a field name in a map so that adding the field is guaranteed | 109 // Marks a field name in a map so that adding the field is guaranteed |
113 // to create a FIELD descriptor in the new map. Used after adding | 110 // to create a FIELD descriptor in the new map. Used after adding |
114 // a constant function the first time, creating a CONSTANT_FUNCTION | 111 // a constant function the first time, creating a CONSTANT_FUNCTION |
115 // descriptor in the new map. This avoids creating multiple maps with | 112 // descriptor in the new map. This avoids creating multiple maps with |
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383 | 380 |
384 // Append a descriptor to this stream. | 381 // Append a descriptor to this stream. |
385 void Write(Descriptor* desc); | 382 void Write(Descriptor* desc); |
386 // Read a descriptor from the reader and append it to this stream. | 383 // Read a descriptor from the reader and append it to this stream. |
387 void WriteFrom(DescriptorReader* reader); | 384 void WriteFrom(DescriptorReader* reader); |
388 }; | 385 }; |
389 | 386 |
390 } } // namespace v8::internal | 387 } } // namespace v8::internal |
391 | 388 |
392 #endif // V8_PROPERTY_H_ | 389 #endif // V8_PROPERTY_H_ |
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