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1 // Copyright 2006-2009 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2009 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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376 STRUCT_LIST_ALL(V) \ | 376 STRUCT_LIST_ALL(V) \ |
377 STRUCT_LIST_DEBUGGER(V) | 377 STRUCT_LIST_DEBUGGER(V) |
378 | 378 |
379 // We use the full 8 bits of the instance_type field to encode heap object | 379 // We use the full 8 bits of the instance_type field to encode heap object |
380 // instance types. The high-order bit (bit 7) is set if the object is not a | 380 // instance types. The high-order bit (bit 7) is set if the object is not a |
381 // string, and cleared if it is a string. | 381 // string, and cleared if it is a string. |
382 const uint32_t kIsNotStringMask = 0x80; | 382 const uint32_t kIsNotStringMask = 0x80; |
383 const uint32_t kStringTag = 0x0; | 383 const uint32_t kStringTag = 0x0; |
384 const uint32_t kNotStringTag = 0x80; | 384 const uint32_t kNotStringTag = 0x80; |
385 | 385 |
386 // If bit 7 is clear, bit 5 indicates that the string is a symbol (if set) or | 386 // Bit 6 indicates that the object is a symbol (if set) or not (if cleared). |
387 // not (if cleared). | 387 // There are not enough types that the non-string types (with bit 7 set) can |
388 const uint32_t kIsSymbolMask = 0x20; | 388 // have bit 6 set too. |
| 389 const uint32_t kIsSymbolMask = 0x40; |
389 const uint32_t kNotSymbolTag = 0x0; | 390 const uint32_t kNotSymbolTag = 0x0; |
390 const uint32_t kSymbolTag = 0x20; | 391 const uint32_t kSymbolTag = 0x40; |
391 | 392 |
392 // If bit 7 is clear then bit 2 indicates whether the string consists of | 393 // If bit 7 is clear then bit 2 indicates whether the string consists of |
393 // two-byte characters or one-byte characters. | 394 // two-byte characters or one-byte characters. |
394 const uint32_t kStringEncodingMask = 0x4; | 395 const uint32_t kStringEncodingMask = 0x4; |
395 const uint32_t kTwoByteStringTag = 0x0; | 396 const uint32_t kTwoByteStringTag = 0x0; |
396 const uint32_t kAsciiStringTag = 0x4; | 397 const uint32_t kAsciiStringTag = 0x4; |
397 | 398 |
398 // If bit 7 is clear, the low-order 2 bits indicate the representation | 399 // If bit 7 is clear, the low-order 2 bits indicate the representation |
399 // of the string. | 400 // of the string. |
400 const uint32_t kStringRepresentationMask = 0x03; | 401 const uint32_t kStringRepresentationMask = 0x03; |
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4950 } else { | 4951 } else { |
4951 value &= ~(1 << bit_position); | 4952 value &= ~(1 << bit_position); |
4952 } | 4953 } |
4953 return value; | 4954 return value; |
4954 } | 4955 } |
4955 }; | 4956 }; |
4956 | 4957 |
4957 } } // namespace v8::internal | 4958 } } // namespace v8::internal |
4958 | 4959 |
4959 #endif // V8_OBJECTS_H_ | 4960 #endif // V8_OBJECTS_H_ |
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