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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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440 kSlicedStringTag = 0x2, | 440 kSlicedStringTag = 0x2, |
441 kExternalStringTag = 0x3 | 441 kExternalStringTag = 0x3 |
442 }; | 442 }; |
443 | 443 |
444 | 444 |
445 // A ConsString with an empty string as the right side is a candidate | 445 // A ConsString with an empty string as the right side is a candidate |
446 // for being shortcut by the garbage collector unless it is a | 446 // for being shortcut by the garbage collector unless it is a |
447 // symbol. It's not common to have non-flat symbols, so we do not | 447 // symbol. It's not common to have non-flat symbols, so we do not |
448 // shortcut them thereby avoiding turning symbols into strings. See | 448 // shortcut them thereby avoiding turning symbols into strings. See |
449 // heap.cc and mark-compact.cc. | 449 // heap.cc and mark-compact.cc. |
450 STATIC_ASSERT(kNotStringTag != 0 && kSymbolTag != 0); | |
451 const uint32_t kShortcutTypeMask = | 450 const uint32_t kShortcutTypeMask = |
452 kIsNotStringMask | | 451 kIsNotStringMask | |
453 kIsSymbolMask | | 452 kIsSymbolMask | |
454 kStringRepresentationMask; | 453 kStringRepresentationMask; |
455 const uint32_t kShortcutTypeTag = kConsStringTag; | 454 const uint32_t kShortcutTypeTag = kConsStringTag; |
456 | 455 |
457 | 456 |
458 enum InstanceType { | 457 enum InstanceType { |
459 SHORT_SYMBOL_TYPE = kShortStringTag | kSymbolTag | kSeqStringTag, | 458 SHORT_SYMBOL_TYPE = kShortStringTag | kSymbolTag | kSeqStringTag, |
460 MEDIUM_SYMBOL_TYPE = kMediumStringTag | kSymbolTag | kSeqStringTag, | 459 MEDIUM_SYMBOL_TYPE = kMediumStringTag | kSymbolTag | kSeqStringTag, |
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4329 } else { | 4328 } else { |
4330 value &= ~(1 << bit_position); | 4329 value &= ~(1 << bit_position); |
4331 } | 4330 } |
4332 return value; | 4331 return value; |
4333 } | 4332 } |
4334 }; | 4333 }; |
4335 | 4334 |
4336 } } // namespace v8::internal | 4335 } } // namespace v8::internal |
4337 | 4336 |
4338 #endif // V8_OBJECTS_H_ | 4337 #endif // V8_OBJECTS_H_ |
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