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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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79 // - CompilationCacheTable | 79 // - CompilationCacheTable |
80 // - CodeCacheHashTable | 80 // - CodeCacheHashTable |
81 // - MapCache | 81 // - MapCache |
82 // - Context | 82 // - Context |
83 // - JSFunctionResultCache | 83 // - JSFunctionResultCache |
84 // - SerializedScopeInfo | 84 // - SerializedScopeInfo |
85 // - String | 85 // - String |
86 // - SeqString | 86 // - SeqString |
87 // - SeqAsciiString | 87 // - SeqAsciiString |
88 // - SeqTwoByteString | 88 // - SeqTwoByteString |
89 // - SlicedString | |
89 // - ConsString | 90 // - ConsString |
90 // - ExternalString | 91 // - ExternalString |
91 // - ExternalAsciiString | 92 // - ExternalAsciiString |
92 // - ExternalTwoByteString | 93 // - ExternalTwoByteString |
93 // - HeapNumber | 94 // - HeapNumber |
94 // - Code | 95 // - Code |
95 // - Map | 96 // - Map |
96 // - Oddball | 97 // - Oddball |
97 // - Foreign | 98 // - Foreign |
98 // - SharedFunctionInfo | 99 // - SharedFunctionInfo |
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273 V(ASCII_SYMBOL_TYPE) \ | 274 V(ASCII_SYMBOL_TYPE) \ |
274 V(CONS_SYMBOL_TYPE) \ | 275 V(CONS_SYMBOL_TYPE) \ |
275 V(CONS_ASCII_SYMBOL_TYPE) \ | 276 V(CONS_ASCII_SYMBOL_TYPE) \ |
276 V(EXTERNAL_SYMBOL_TYPE) \ | 277 V(EXTERNAL_SYMBOL_TYPE) \ |
277 V(EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE) \ | 278 V(EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE) \ |
278 V(EXTERNAL_ASCII_SYMBOL_TYPE) \ | 279 V(EXTERNAL_ASCII_SYMBOL_TYPE) \ |
279 V(STRING_TYPE) \ | 280 V(STRING_TYPE) \ |
280 V(ASCII_STRING_TYPE) \ | 281 V(ASCII_STRING_TYPE) \ |
281 V(CONS_STRING_TYPE) \ | 282 V(CONS_STRING_TYPE) \ |
282 V(CONS_ASCII_STRING_TYPE) \ | 283 V(CONS_ASCII_STRING_TYPE) \ |
284 V(SLICED_STRING_TYPE) \ | |
283 V(EXTERNAL_STRING_TYPE) \ | 285 V(EXTERNAL_STRING_TYPE) \ |
284 V(EXTERNAL_STRING_WITH_ASCII_DATA_TYPE) \ | 286 V(EXTERNAL_STRING_WITH_ASCII_DATA_TYPE) \ |
285 V(EXTERNAL_ASCII_STRING_TYPE) \ | 287 V(EXTERNAL_ASCII_STRING_TYPE) \ |
286 V(PRIVATE_EXTERNAL_ASCII_STRING_TYPE) \ | 288 V(PRIVATE_EXTERNAL_ASCII_STRING_TYPE) \ |
287 \ | 289 \ |
288 V(MAP_TYPE) \ | 290 V(MAP_TYPE) \ |
289 V(CODE_TYPE) \ | 291 V(CODE_TYPE) \ |
290 V(ODDBALL_TYPE) \ | 292 V(ODDBALL_TYPE) \ |
291 V(JS_GLOBAL_PROPERTY_CELL_TYPE) \ | 293 V(JS_GLOBAL_PROPERTY_CELL_TYPE) \ |
292 \ | 294 \ |
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361 ascii_symbol, \ | 363 ascii_symbol, \ |
362 AsciiSymbol) \ | 364 AsciiSymbol) \ |
363 V(CONS_SYMBOL_TYPE, \ | 365 V(CONS_SYMBOL_TYPE, \ |
364 ConsString::kSize, \ | 366 ConsString::kSize, \ |
365 cons_symbol, \ | 367 cons_symbol, \ |
366 ConsSymbol) \ | 368 ConsSymbol) \ |
367 V(CONS_ASCII_SYMBOL_TYPE, \ | 369 V(CONS_ASCII_SYMBOL_TYPE, \ |
368 ConsString::kSize, \ | 370 ConsString::kSize, \ |
369 cons_ascii_symbol, \ | 371 cons_ascii_symbol, \ |
370 ConsAsciiSymbol) \ | 372 ConsAsciiSymbol) \ |
373 V(SLICED_SYMBOL_TYPE, \ | |
374 SlicedString::kSize, \ | |
375 sliced_symbol, \ | |
376 SlicedSymbol) \ | |
377 V(SLICED_ASCII_SYMBOL_TYPE, \ | |
378 SlicedString::kSize, \ | |
379 sliced_ascii_symbol, \ | |
380 SlicedAsciiSymbol) \ | |
371 V(EXTERNAL_SYMBOL_TYPE, \ | 381 V(EXTERNAL_SYMBOL_TYPE, \ |
372 ExternalTwoByteString::kSize, \ | 382 ExternalTwoByteString::kSize, \ |
373 external_symbol, \ | 383 external_symbol, \ |
374 ExternalSymbol) \ | 384 ExternalSymbol) \ |
375 V(EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE, \ | 385 V(EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE, \ |
376 ExternalTwoByteString::kSize, \ | 386 ExternalTwoByteString::kSize, \ |
377 external_symbol_with_ascii_data, \ | 387 external_symbol_with_ascii_data, \ |
378 ExternalSymbolWithAsciiData) \ | 388 ExternalSymbolWithAsciiData) \ |
379 V(EXTERNAL_ASCII_SYMBOL_TYPE, \ | 389 V(EXTERNAL_ASCII_SYMBOL_TYPE, \ |
380 ExternalAsciiString::kSize, \ | 390 ExternalAsciiString::kSize, \ |
381 external_ascii_symbol, \ | 391 external_ascii_symbol, \ |
382 ExternalAsciiSymbol) \ | 392 ExternalAsciiSymbol) \ |
383 V(STRING_TYPE, \ | 393 V(STRING_TYPE, \ |
384 kVariableSizeSentinel, \ | 394 kVariableSizeSentinel, \ |
385 string, \ | 395 string, \ |
386 String) \ | 396 String) \ |
387 V(ASCII_STRING_TYPE, \ | 397 V(ASCII_STRING_TYPE, \ |
388 kVariableSizeSentinel, \ | 398 kVariableSizeSentinel, \ |
389 ascii_string, \ | 399 ascii_string, \ |
390 AsciiString) \ | 400 AsciiString) \ |
391 V(CONS_STRING_TYPE, \ | 401 V(CONS_STRING_TYPE, \ |
392 ConsString::kSize, \ | 402 ConsString::kSize, \ |
393 cons_string, \ | 403 cons_string, \ |
394 ConsString) \ | 404 ConsString) \ |
395 V(CONS_ASCII_STRING_TYPE, \ | 405 V(CONS_ASCII_STRING_TYPE, \ |
396 ConsString::kSize, \ | 406 ConsString::kSize, \ |
397 cons_ascii_string, \ | 407 cons_ascii_string, \ |
398 ConsAsciiString) \ | 408 ConsAsciiString) \ |
409 V(SLICED_STRING_TYPE, \ | |
410 SlicedString::kSize, \ | |
411 sliced_string, \ | |
412 SlicedString) \ | |
413 V(SLICED_ASCII_STRING_TYPE, \ | |
414 SlicedString::kSize, \ | |
415 sliced_ascii_string, \ | |
416 SlicedAsciiString) \ | |
399 V(EXTERNAL_STRING_TYPE, \ | 417 V(EXTERNAL_STRING_TYPE, \ |
400 ExternalTwoByteString::kSize, \ | 418 ExternalTwoByteString::kSize, \ |
401 external_string, \ | 419 external_string, \ |
402 ExternalString) \ | 420 ExternalString) \ |
403 V(EXTERNAL_STRING_WITH_ASCII_DATA_TYPE, \ | 421 V(EXTERNAL_STRING_WITH_ASCII_DATA_TYPE, \ |
404 ExternalTwoByteString::kSize, \ | 422 ExternalTwoByteString::kSize, \ |
405 external_string_with_ascii_data, \ | 423 external_string_with_ascii_data, \ |
406 ExternalStringWithAsciiData) \ | 424 ExternalStringWithAsciiData) \ |
407 V(EXTERNAL_ASCII_STRING_TYPE, \ | 425 V(EXTERNAL_ASCII_STRING_TYPE, \ |
408 ExternalAsciiString::kSize, \ | 426 ExternalAsciiString::kSize, \ |
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462 const uint32_t kStringEncodingMask = 0x4; | 480 const uint32_t kStringEncodingMask = 0x4; |
463 const uint32_t kTwoByteStringTag = 0x0; | 481 const uint32_t kTwoByteStringTag = 0x0; |
464 const uint32_t kAsciiStringTag = 0x4; | 482 const uint32_t kAsciiStringTag = 0x4; |
465 | 483 |
466 // If bit 7 is clear, the low-order 2 bits indicate the representation | 484 // If bit 7 is clear, the low-order 2 bits indicate the representation |
467 // of the string. | 485 // of the string. |
468 const uint32_t kStringRepresentationMask = 0x03; | 486 const uint32_t kStringRepresentationMask = 0x03; |
469 enum StringRepresentationTag { | 487 enum StringRepresentationTag { |
470 kSeqStringTag = 0x0, | 488 kSeqStringTag = 0x0, |
471 kConsStringTag = 0x1, | 489 kConsStringTag = 0x1, |
472 kExternalStringTag = 0x2 | 490 kExternalStringTag = 0x2, |
491 kSlicedStringTag = 0x3 | |
473 }; | 492 }; |
474 const uint32_t kIsConsStringMask = 0x1; | 493 const uint32_t kIsIndirectStringMask = 0x1; |
494 const uint32_t kIsIndirectStringTag = 0x1; | |
antonm
2011/07/27 12:16:39
maybe worth adding some documentation why it works
| |
475 | 495 |
476 // If bit 7 is clear, then bit 3 indicates whether this two-byte | 496 // If bit 7 is clear, then bit 3 indicates whether this two-byte |
477 // string actually contains ascii data. | 497 // string actually contains ascii data. |
478 const uint32_t kAsciiDataHintMask = 0x08; | 498 const uint32_t kAsciiDataHintMask = 0x08; |
479 const uint32_t kAsciiDataHintTag = 0x08; | 499 const uint32_t kAsciiDataHintTag = 0x08; |
480 | 500 |
481 | 501 |
482 // A ConsString with an empty string as the right side is a candidate | 502 // A ConsString with an empty string as the right side is a candidate |
483 // for being shortcut by the garbage collector unless it is a | 503 // for being shortcut by the garbage collector unless it is a |
484 // symbol. It's not common to have non-flat symbols, so we do not | 504 // symbol. It's not common to have non-flat symbols, so we do not |
485 // shortcut them thereby avoiding turning symbols into strings. See | 505 // shortcut them thereby avoiding turning symbols into strings. See |
486 // heap.cc and mark-compact.cc. | 506 // heap.cc and mark-compact.cc. |
487 const uint32_t kShortcutTypeMask = | 507 const uint32_t kShortcutTypeMask = |
488 kIsNotStringMask | | 508 kIsNotStringMask | |
489 kIsSymbolMask | | 509 kIsSymbolMask | |
490 kStringRepresentationMask; | 510 kStringRepresentationMask; |
491 const uint32_t kShortcutTypeTag = kConsStringTag; | 511 const uint32_t kShortcutTypeTag = kConsStringTag; |
492 | 512 |
493 | 513 |
494 enum InstanceType { | 514 enum InstanceType { |
495 // String types. | 515 // String types. |
496 SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kSeqStringTag, | 516 SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kSeqStringTag, |
497 ASCII_SYMBOL_TYPE = kAsciiStringTag | kSymbolTag | kSeqStringTag, | 517 ASCII_SYMBOL_TYPE = kAsciiStringTag | kSymbolTag | kSeqStringTag, |
498 CONS_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kConsStringTag, | 518 CONS_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kConsStringTag, |
499 CONS_ASCII_SYMBOL_TYPE = kAsciiStringTag | kSymbolTag | kConsStringTag, | 519 CONS_ASCII_SYMBOL_TYPE = kAsciiStringTag | kSymbolTag | kConsStringTag, |
520 SLICED_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kSlicedStringTag, | |
521 SLICED_ASCII_SYMBOL_TYPE = kAsciiStringTag | kSymbolTag | kSlicedStringTag, | |
500 EXTERNAL_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kExternalStringTag, | 522 EXTERNAL_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kExternalStringTag, |
501 EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE = | 523 EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE = |
502 kTwoByteStringTag | kSymbolTag | kExternalStringTag | kAsciiDataHintTag, | 524 kTwoByteStringTag | kSymbolTag | kExternalStringTag | kAsciiDataHintTag, |
503 EXTERNAL_ASCII_SYMBOL_TYPE = | 525 EXTERNAL_ASCII_SYMBOL_TYPE = |
504 kAsciiStringTag | kSymbolTag | kExternalStringTag, | 526 kAsciiStringTag | kSymbolTag | kExternalStringTag, |
505 STRING_TYPE = kTwoByteStringTag | kSeqStringTag, | 527 STRING_TYPE = kTwoByteStringTag | kSeqStringTag, |
506 ASCII_STRING_TYPE = kAsciiStringTag | kSeqStringTag, | 528 ASCII_STRING_TYPE = kAsciiStringTag | kSeqStringTag, |
507 CONS_STRING_TYPE = kTwoByteStringTag | kConsStringTag, | 529 CONS_STRING_TYPE = kTwoByteStringTag | kConsStringTag, |
508 CONS_ASCII_STRING_TYPE = kAsciiStringTag | kConsStringTag, | 530 CONS_ASCII_STRING_TYPE = kAsciiStringTag | kConsStringTag, |
531 SLICED_STRING_TYPE = kTwoByteStringTag | kSlicedStringTag, | |
532 SLICED_ASCII_STRING_TYPE = kAsciiStringTag | kSlicedStringTag, | |
509 EXTERNAL_STRING_TYPE = kTwoByteStringTag | kExternalStringTag, | 533 EXTERNAL_STRING_TYPE = kTwoByteStringTag | kExternalStringTag, |
510 EXTERNAL_STRING_WITH_ASCII_DATA_TYPE = | 534 EXTERNAL_STRING_WITH_ASCII_DATA_TYPE = |
511 kTwoByteStringTag | kExternalStringTag | kAsciiDataHintTag, | 535 kTwoByteStringTag | kExternalStringTag | kAsciiDataHintTag, |
512 // LAST_STRING_TYPE | 536 // LAST_STRING_TYPE |
513 EXTERNAL_ASCII_STRING_TYPE = kAsciiStringTag | kExternalStringTag, | 537 EXTERNAL_ASCII_STRING_TYPE = kAsciiStringTag | kExternalStringTag, |
514 PRIVATE_EXTERNAL_ASCII_STRING_TYPE = EXTERNAL_ASCII_STRING_TYPE, | 538 PRIVATE_EXTERNAL_ASCII_STRING_TYPE = EXTERNAL_ASCII_STRING_TYPE, |
515 | 539 |
516 // Objects allocated in their own spaces (never in new space). | 540 // Objects allocated in their own spaces (never in new space). |
517 MAP_TYPE = kNotStringTag, // FIRST_NONSTRING_TYPE | 541 MAP_TYPE = kNotStringTag, // FIRST_NONSTRING_TYPE |
518 CODE_TYPE, | 542 CODE_TYPE, |
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702 V(HeapObject) \ | 726 V(HeapObject) \ |
703 V(Number) \ | 727 V(Number) \ |
704 | 728 |
705 #define HEAP_OBJECT_TYPE_LIST(V) \ | 729 #define HEAP_OBJECT_TYPE_LIST(V) \ |
706 V(HeapNumber) \ | 730 V(HeapNumber) \ |
707 V(String) \ | 731 V(String) \ |
708 V(Symbol) \ | 732 V(Symbol) \ |
709 V(SeqString) \ | 733 V(SeqString) \ |
710 V(ExternalString) \ | 734 V(ExternalString) \ |
711 V(ConsString) \ | 735 V(ConsString) \ |
736 V(SlicedString) \ | |
712 V(ExternalTwoByteString) \ | 737 V(ExternalTwoByteString) \ |
713 V(ExternalAsciiString) \ | 738 V(ExternalAsciiString) \ |
714 V(SeqTwoByteString) \ | 739 V(SeqTwoByteString) \ |
715 V(SeqAsciiString) \ | 740 V(SeqAsciiString) \ |
716 \ | 741 \ |
717 V(ExternalArray) \ | 742 V(ExternalArray) \ |
718 V(ExternalByteArray) \ | 743 V(ExternalByteArray) \ |
719 V(ExternalUnsignedByteArray) \ | 744 V(ExternalUnsignedByteArray) \ |
720 V(ExternalShortArray) \ | 745 V(ExternalShortArray) \ |
721 V(ExternalUnsignedShortArray) \ | 746 V(ExternalUnsignedShortArray) \ |
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5702 // prone and so we no longer put StringShapes in variables unless there is a | 5727 // prone and so we no longer put StringShapes in variables unless there is a |
5703 // concrete performance benefit at that particular point in the code. | 5728 // concrete performance benefit at that particular point in the code. |
5704 class StringShape BASE_EMBEDDED { | 5729 class StringShape BASE_EMBEDDED { |
5705 public: | 5730 public: |
5706 inline explicit StringShape(String* s); | 5731 inline explicit StringShape(String* s); |
5707 inline explicit StringShape(Map* s); | 5732 inline explicit StringShape(Map* s); |
5708 inline explicit StringShape(InstanceType t); | 5733 inline explicit StringShape(InstanceType t); |
5709 inline bool IsSequential(); | 5734 inline bool IsSequential(); |
5710 inline bool IsExternal(); | 5735 inline bool IsExternal(); |
5711 inline bool IsCons(); | 5736 inline bool IsCons(); |
5737 inline bool IsSliced(); | |
5712 inline bool IsExternalAscii(); | 5738 inline bool IsExternalAscii(); |
5713 inline bool IsExternalTwoByte(); | 5739 inline bool IsExternalTwoByte(); |
5714 inline bool IsSequentialAscii(); | 5740 inline bool IsSequentialAscii(); |
5715 inline bool IsSequentialTwoByte(); | 5741 inline bool IsSequentialTwoByte(); |
5716 inline bool IsSymbol(); | 5742 inline bool IsSymbol(); |
5717 inline StringRepresentationTag representation_tag(); | 5743 inline StringRepresentationTag representation_tag(); |
5718 inline uint32_t full_representation_tag(); | 5744 inline uint32_t full_representation_tag(); |
5719 inline uint32_t size_tag(); | 5745 inline uint32_t size_tag(); |
5720 #ifdef DEBUG | 5746 #ifdef DEBUG |
5721 inline uint32_t type() { return type_; } | 5747 inline uint32_t type() { return type_; } |
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6221 static const int kMinLength = 13; | 6247 static const int kMinLength = 13; |
6222 | 6248 |
6223 typedef FixedBodyDescriptor<kFirstOffset, kSecondOffset + kPointerSize, kSize> | 6249 typedef FixedBodyDescriptor<kFirstOffset, kSecondOffset + kPointerSize, kSize> |
6224 BodyDescriptor; | 6250 BodyDescriptor; |
6225 | 6251 |
6226 private: | 6252 private: |
6227 DISALLOW_IMPLICIT_CONSTRUCTORS(ConsString); | 6253 DISALLOW_IMPLICIT_CONSTRUCTORS(ConsString); |
6228 }; | 6254 }; |
6229 | 6255 |
6230 | 6256 |
6257 class SlicedString: public String { | |
6258 public: | |
6259 | |
6260 inline String* parent(); | |
6261 inline void set_parent(String* parent, WriteBarrierMode mode); | |
6262 inline int offset(); | |
6263 inline void set_offset(int offset); | |
6264 | |
6265 // Dispatched behavior. | |
6266 uint16_t SlicedStringGet(int index); | |
6267 | |
6268 // Casting. | |
6269 static inline SlicedString* cast(Object* obj); | |
6270 | |
6271 // Layout description. | |
6272 static const int kParentOffset = POINTER_SIZE_ALIGN(String::kSize); | |
6273 static const int kOffsetOffset = kParentOffset + kPointerSize; | |
6274 static const int kSize = kOffsetOffset + kPointerSize; | |
6275 | |
6276 // Support for StringInputBuffer | |
6277 inline const unibrow::byte* SlicedStringReadBlock(ReadBlockBuffer* buffer, | |
6278 unsigned* offset_ptr, | |
6279 unsigned chars); | |
6280 inline void SlicedStringReadBlockIntoBuffer(ReadBlockBuffer* buffer, | |
6281 unsigned* offset_ptr, | |
6282 unsigned chars); | |
6283 // Minimum length for a sliced string. | |
6284 static const int kMinLength = 13; | |
6285 | |
6286 typedef FixedBodyDescriptor<kParentOffset, | |
6287 kOffsetOffset + kPointerSize, kSize> | |
6288 BodyDescriptor; | |
6289 | |
6290 private: | |
6291 DISALLOW_IMPLICIT_CONSTRUCTORS(SlicedString); | |
6292 }; | |
6293 | |
6294 | |
6231 // The ExternalString class describes string values that are backed by | 6295 // The ExternalString class describes string values that are backed by |
6232 // a string resource that lies outside the V8 heap. ExternalStrings | 6296 // a string resource that lies outside the V8 heap. ExternalStrings |
6233 // consist of the length field common to all strings, a pointer to the | 6297 // consist of the length field common to all strings, a pointer to the |
6234 // external resource. It is important to ensure (externally) that the | 6298 // external resource. It is important to ensure (externally) that the |
6235 // resource is not deallocated while the ExternalString is live in the | 6299 // resource is not deallocated while the ExternalString is live in the |
6236 // V8 heap. | 6300 // V8 heap. |
6237 // | 6301 // |
6238 // The API expects that all ExternalStrings are created through the | 6302 // The API expects that all ExternalStrings are created through the |
6239 // API. Therefore, ExternalStrings should not be used internally. | 6303 // API. Therefore, ExternalStrings should not be used internally. |
6240 class ExternalString: public String { | 6304 class ExternalString: public String { |
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7203 } else { | 7267 } else { |
7204 value &= ~(1 << bit_position); | 7268 value &= ~(1 << bit_position); |
7205 } | 7269 } |
7206 return value; | 7270 return value; |
7207 } | 7271 } |
7208 }; | 7272 }; |
7209 | 7273 |
7210 } } // namespace v8::internal | 7274 } } // namespace v8::internal |
7211 | 7275 |
7212 #endif // V8_OBJECTS_H_ | 7276 #endif // V8_OBJECTS_H_ |
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