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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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389 ascii_string, \ | 391 ascii_string, \ |
390 AsciiString) \ | 392 AsciiString) \ |
391 V(CONS_STRING_TYPE, \ | 393 V(CONS_STRING_TYPE, \ |
392 ConsString::kSize, \ | 394 ConsString::kSize, \ |
393 cons_string, \ | 395 cons_string, \ |
394 ConsString) \ | 396 ConsString) \ |
395 V(CONS_ASCII_STRING_TYPE, \ | 397 V(CONS_ASCII_STRING_TYPE, \ |
396 ConsString::kSize, \ | 398 ConsString::kSize, \ |
397 cons_ascii_string, \ | 399 cons_ascii_string, \ |
398 ConsAsciiString) \ | 400 ConsAsciiString) \ |
401 V(SLICED_STRING_TYPE, \ | |
402 SlicedString::kSize, \ | |
403 sliced_string, \ | |
404 SlicedString) \ | |
405 V(SLICED_ASCII_STRING_TYPE, \ | |
406 SlicedString::kSize, \ | |
407 sliced_ascii_string, \ | |
408 SlicedAsciiString) \ | |
399 V(EXTERNAL_STRING_TYPE, \ | 409 V(EXTERNAL_STRING_TYPE, \ |
400 ExternalTwoByteString::kSize, \ | 410 ExternalTwoByteString::kSize, \ |
401 external_string, \ | 411 external_string, \ |
402 ExternalString) \ | 412 ExternalString) \ |
403 V(EXTERNAL_STRING_WITH_ASCII_DATA_TYPE, \ | 413 V(EXTERNAL_STRING_WITH_ASCII_DATA_TYPE, \ |
404 ExternalTwoByteString::kSize, \ | 414 ExternalTwoByteString::kSize, \ |
405 external_string_with_ascii_data, \ | 415 external_string_with_ascii_data, \ |
406 ExternalStringWithAsciiData) \ | 416 ExternalStringWithAsciiData) \ |
407 V(EXTERNAL_ASCII_STRING_TYPE, \ | 417 V(EXTERNAL_ASCII_STRING_TYPE, \ |
408 ExternalAsciiString::kSize, \ | 418 ExternalAsciiString::kSize, \ |
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462 const uint32_t kStringEncodingMask = 0x4; | 472 const uint32_t kStringEncodingMask = 0x4; |
463 const uint32_t kTwoByteStringTag = 0x0; | 473 const uint32_t kTwoByteStringTag = 0x0; |
464 const uint32_t kAsciiStringTag = 0x4; | 474 const uint32_t kAsciiStringTag = 0x4; |
465 | 475 |
466 // If bit 7 is clear, the low-order 2 bits indicate the representation | 476 // If bit 7 is clear, the low-order 2 bits indicate the representation |
467 // of the string. | 477 // of the string. |
468 const uint32_t kStringRepresentationMask = 0x03; | 478 const uint32_t kStringRepresentationMask = 0x03; |
469 enum StringRepresentationTag { | 479 enum StringRepresentationTag { |
470 kSeqStringTag = 0x0, | 480 kSeqStringTag = 0x0, |
471 kConsStringTag = 0x1, | 481 kConsStringTag = 0x1, |
472 kExternalStringTag = 0x2 | 482 kExternalStringTag = 0x2, |
483 kSlicedStringTag = 0x3 | |
473 }; | 484 }; |
474 const uint32_t kIsConsStringMask = 0x1; | 485 const uint32_t kIsIndirectStringMask = 0x1; |
486 const uint32_t kIsIndirectStringTag = 0x1; | |
487 STATIC_ASSERT( | |
488 (kConsStringTag & kIsIndirectStringMask) == kIsIndirectStringTag); | |
489 STATIC_ASSERT( | |
490 (kSlicedStringTag & kIsIndirectStringMask) == kIsIndirectStringTag); | |
475 | 491 |
476 // If bit 7 is clear, then bit 3 indicates whether this two-byte | 492 // If bit 7 is clear, then bit 3 indicates whether this two-byte |
477 // string actually contains ascii data. | 493 // string actually contains ascii data. |
478 const uint32_t kAsciiDataHintMask = 0x08; | 494 const uint32_t kAsciiDataHintMask = 0x08; |
479 const uint32_t kAsciiDataHintTag = 0x08; | 495 const uint32_t kAsciiDataHintTag = 0x08; |
480 | 496 |
481 | 497 |
482 // A ConsString with an empty string as the right side is a candidate | 498 // 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 | 499 // 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 | 500 // symbol. It's not common to have non-flat symbols, so we do not |
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499 CONS_ASCII_SYMBOL_TYPE = kAsciiStringTag | kSymbolTag | kConsStringTag, | 515 CONS_ASCII_SYMBOL_TYPE = kAsciiStringTag | kSymbolTag | kConsStringTag, |
500 EXTERNAL_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kExternalStringTag, | 516 EXTERNAL_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kExternalStringTag, |
501 EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE = | 517 EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE = |
502 kTwoByteStringTag | kSymbolTag | kExternalStringTag | kAsciiDataHintTag, | 518 kTwoByteStringTag | kSymbolTag | kExternalStringTag | kAsciiDataHintTag, |
503 EXTERNAL_ASCII_SYMBOL_TYPE = | 519 EXTERNAL_ASCII_SYMBOL_TYPE = |
504 kAsciiStringTag | kSymbolTag | kExternalStringTag, | 520 kAsciiStringTag | kSymbolTag | kExternalStringTag, |
505 STRING_TYPE = kTwoByteStringTag | kSeqStringTag, | 521 STRING_TYPE = kTwoByteStringTag | kSeqStringTag, |
506 ASCII_STRING_TYPE = kAsciiStringTag | kSeqStringTag, | 522 ASCII_STRING_TYPE = kAsciiStringTag | kSeqStringTag, |
507 CONS_STRING_TYPE = kTwoByteStringTag | kConsStringTag, | 523 CONS_STRING_TYPE = kTwoByteStringTag | kConsStringTag, |
508 CONS_ASCII_STRING_TYPE = kAsciiStringTag | kConsStringTag, | 524 CONS_ASCII_STRING_TYPE = kAsciiStringTag | kConsStringTag, |
525 SLICED_STRING_TYPE = kTwoByteStringTag | kSlicedStringTag, | |
526 SLICED_ASCII_STRING_TYPE = kAsciiStringTag | kSlicedStringTag, | |
509 EXTERNAL_STRING_TYPE = kTwoByteStringTag | kExternalStringTag, | 527 EXTERNAL_STRING_TYPE = kTwoByteStringTag | kExternalStringTag, |
510 EXTERNAL_STRING_WITH_ASCII_DATA_TYPE = | 528 EXTERNAL_STRING_WITH_ASCII_DATA_TYPE = |
511 kTwoByteStringTag | kExternalStringTag | kAsciiDataHintTag, | 529 kTwoByteStringTag | kExternalStringTag | kAsciiDataHintTag, |
512 // LAST_STRING_TYPE | 530 // LAST_STRING_TYPE |
513 EXTERNAL_ASCII_STRING_TYPE = kAsciiStringTag | kExternalStringTag, | 531 EXTERNAL_ASCII_STRING_TYPE = kAsciiStringTag | kExternalStringTag, |
514 PRIVATE_EXTERNAL_ASCII_STRING_TYPE = EXTERNAL_ASCII_STRING_TYPE, | 532 PRIVATE_EXTERNAL_ASCII_STRING_TYPE = EXTERNAL_ASCII_STRING_TYPE, |
515 | 533 |
516 // Objects allocated in their own spaces (never in new space). | 534 // Objects allocated in their own spaces (never in new space). |
517 MAP_TYPE = kNotStringTag, // FIRST_NONSTRING_TYPE | 535 MAP_TYPE = kNotStringTag, // FIRST_NONSTRING_TYPE |
518 CODE_TYPE, | 536 CODE_TYPE, |
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702 V(HeapObject) \ | 720 V(HeapObject) \ |
703 V(Number) \ | 721 V(Number) \ |
704 | 722 |
705 #define HEAP_OBJECT_TYPE_LIST(V) \ | 723 #define HEAP_OBJECT_TYPE_LIST(V) \ |
706 V(HeapNumber) \ | 724 V(HeapNumber) \ |
707 V(String) \ | 725 V(String) \ |
708 V(Symbol) \ | 726 V(Symbol) \ |
709 V(SeqString) \ | 727 V(SeqString) \ |
710 V(ExternalString) \ | 728 V(ExternalString) \ |
711 V(ConsString) \ | 729 V(ConsString) \ |
730 V(SlicedString) \ | |
712 V(ExternalTwoByteString) \ | 731 V(ExternalTwoByteString) \ |
713 V(ExternalAsciiString) \ | 732 V(ExternalAsciiString) \ |
714 V(SeqTwoByteString) \ | 733 V(SeqTwoByteString) \ |
715 V(SeqAsciiString) \ | 734 V(SeqAsciiString) \ |
716 \ | 735 \ |
717 V(ExternalArray) \ | 736 V(ExternalArray) \ |
718 V(ExternalByteArray) \ | 737 V(ExternalByteArray) \ |
719 V(ExternalUnsignedByteArray) \ | 738 V(ExternalUnsignedByteArray) \ |
720 V(ExternalShortArray) \ | 739 V(ExternalShortArray) \ |
721 V(ExternalUnsignedShortArray) \ | 740 V(ExternalUnsignedShortArray) \ |
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5702 // prone and so we no longer put StringShapes in variables unless there is a | 5721 // 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. | 5722 // concrete performance benefit at that particular point in the code. |
5704 class StringShape BASE_EMBEDDED { | 5723 class StringShape BASE_EMBEDDED { |
5705 public: | 5724 public: |
5706 inline explicit StringShape(String* s); | 5725 inline explicit StringShape(String* s); |
5707 inline explicit StringShape(Map* s); | 5726 inline explicit StringShape(Map* s); |
5708 inline explicit StringShape(InstanceType t); | 5727 inline explicit StringShape(InstanceType t); |
5709 inline bool IsSequential(); | 5728 inline bool IsSequential(); |
5710 inline bool IsExternal(); | 5729 inline bool IsExternal(); |
5711 inline bool IsCons(); | 5730 inline bool IsCons(); |
5731 inline bool IsSliced(); | |
5732 inline bool IsIndirect(); | |
5712 inline bool IsExternalAscii(); | 5733 inline bool IsExternalAscii(); |
5713 inline bool IsExternalTwoByte(); | 5734 inline bool IsExternalTwoByte(); |
5714 inline bool IsSequentialAscii(); | 5735 inline bool IsSequentialAscii(); |
5715 inline bool IsSequentialTwoByte(); | 5736 inline bool IsSequentialTwoByte(); |
5716 inline bool IsSymbol(); | 5737 inline bool IsSymbol(); |
5717 inline StringRepresentationTag representation_tag(); | 5738 inline StringRepresentationTag representation_tag(); |
5718 inline uint32_t full_representation_tag(); | 5739 inline uint32_t full_representation_tag(); |
5719 inline uint32_t size_tag(); | 5740 inline uint32_t size_tag(); |
5720 #ifdef DEBUG | 5741 #ifdef DEBUG |
5721 inline uint32_t type() { return type_; } | 5742 inline uint32_t type() { return type_; } |
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5787 // | 5808 // |
5788 // Use FlattenString from Handles.cc to flatten even in case an | 5809 // Use FlattenString from Handles.cc to flatten even in case an |
5789 // allocation failure happens. | 5810 // allocation failure happens. |
5790 inline MaybeObject* TryFlatten(PretenureFlag pretenure = NOT_TENURED); | 5811 inline MaybeObject* TryFlatten(PretenureFlag pretenure = NOT_TENURED); |
5791 | 5812 |
5792 // Convenience function. Has exactly the same behavior as | 5813 // Convenience function. Has exactly the same behavior as |
5793 // TryFlatten(), except in the case of failure returns the original | 5814 // TryFlatten(), except in the case of failure returns the original |
5794 // string. | 5815 // string. |
5795 inline String* TryFlattenGetString(PretenureFlag pretenure = NOT_TENURED); | 5816 inline String* TryFlattenGetString(PretenureFlag pretenure = NOT_TENURED); |
5796 | 5817 |
5818 // Equivalent to Flatten for string slices. A new parent string is created | |
5819 // with exactly the required characters. Offset is set to 0. | |
5820 inline MaybeObject* TryTruncate(PretenureFlag pretenure = NOT_TENURED); | |
5821 inline String* TryTruncateGetString(PretenureFlag pretenure = NOT_TENURED); | |
5822 | |
5823 // Combines flatten and truncate. | |
5824 inline MaybeObject* TryFlattenOrTruncate(PretenureFlag pretenure | |
5825 = NOT_TENURED); | |
5826 | |
5827 // Returns the parent of a sliced string or first part of a cons string. | |
5828 inline String* GetIndirect(); | |
5829 | |
5797 Vector<const char> ToAsciiVector(); | 5830 Vector<const char> ToAsciiVector(); |
5798 Vector<const uc16> ToUC16Vector(); | 5831 Vector<const uc16> ToUC16Vector(); |
5799 | 5832 |
5800 // Mark the string as an undetectable object. It only applies to | 5833 // Mark the string as an undetectable object. It only applies to |
5801 // ascii and two byte string types. | 5834 // ascii and two byte string types. |
5802 bool MarkAsUndetectable(); | 5835 bool MarkAsUndetectable(); |
5803 | 5836 |
5804 // Return a substring. | 5837 // Return a substring. |
5805 MUST_USE_RESULT MaybeObject* SubString(int from, | 5838 MUST_USE_RESULT MaybeObject* SubString(int from, |
5806 int to, | 5839 int to, |
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5874 #ifdef OBJECT_PRINT | 5907 #ifdef OBJECT_PRINT |
5875 inline void StringPrint() { | 5908 inline void StringPrint() { |
5876 StringPrint(stdout); | 5909 StringPrint(stdout); |
5877 } | 5910 } |
5878 void StringPrint(FILE* out); | 5911 void StringPrint(FILE* out); |
5879 #endif | 5912 #endif |
5880 #ifdef DEBUG | 5913 #ifdef DEBUG |
5881 void StringVerify(); | 5914 void StringVerify(); |
5882 #endif | 5915 #endif |
5883 inline bool IsFlat(); | 5916 inline bool IsFlat(); |
5917 inline bool IsTruncated(); | |
5918 inline bool IsFlatAndTruncated(); | |
5884 | 5919 |
5885 // Layout description. | 5920 // Layout description. |
5886 static const int kLengthOffset = HeapObject::kHeaderSize; | 5921 static const int kLengthOffset = HeapObject::kHeaderSize; |
5887 static const int kHashFieldOffset = kLengthOffset + kPointerSize; | 5922 static const int kHashFieldOffset = kLengthOffset + kPointerSize; |
5888 static const int kSize = kHashFieldOffset + kPointerSize; | 5923 static const int kSize = kHashFieldOffset + kPointerSize; |
5889 | 5924 |
5890 // Maximum number of characters to consider when trying to convert a string | 5925 // Maximum number of characters to consider when trying to convert a string |
5891 // value into an array index. | 5926 // value into an array index. |
5892 static const int kMaxArrayIndexSize = 10; | 5927 static const int kMaxArrayIndexSize = 10; |
5893 | 5928 |
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6036 ReadBlockBuffer* buffer, | 6071 ReadBlockBuffer* buffer, |
6037 unsigned* offset_ptr, | 6072 unsigned* offset_ptr, |
6038 unsigned max_chars); | 6073 unsigned max_chars); |
6039 | 6074 |
6040 private: | 6075 private: |
6041 // Try to flatten the top level ConsString that is hiding behind this | 6076 // Try to flatten the top level ConsString that is hiding behind this |
6042 // string. This is a no-op unless the string is a ConsString. Flatten | 6077 // string. This is a no-op unless the string is a ConsString. Flatten |
6043 // mutates the ConsString and might return a failure. | 6078 // mutates the ConsString and might return a failure. |
6044 MUST_USE_RESULT MaybeObject* SlowTryFlatten(PretenureFlag pretenure); | 6079 MUST_USE_RESULT MaybeObject* SlowTryFlatten(PretenureFlag pretenure); |
6045 | 6080 |
6081 // Try to create a new sequential string as parent for the slice that is | |
6082 // as short as possible. This is a no-op unless the string is a SlicedString. | |
6083 // Truncating mutates the SlicedString and might return a failure. | |
6084 MUST_USE_RESULT MaybeObject* SlowTryTruncate(PretenureFlag pretenure); | |
6085 | |
6046 static inline bool IsHashFieldComputed(uint32_t field); | 6086 static inline bool IsHashFieldComputed(uint32_t field); |
6047 | 6087 |
6048 // Slow case of String::Equals. This implementation works on any strings | 6088 // Slow case of String::Equals. This implementation works on any strings |
6049 // but it is most efficient on strings that are almost flat. | 6089 // but it is most efficient on strings that are almost flat. |
6050 bool SlowEquals(String* other); | 6090 bool SlowEquals(String* other); |
6051 | 6091 |
6052 // Slow case of AsArrayIndex. | 6092 // Slow case of AsArrayIndex. |
6053 bool SlowAsArrayIndex(uint32_t* index); | 6093 bool SlowAsArrayIndex(uint32_t* index); |
6054 | 6094 |
6055 // Compute and set the hash code. | 6095 // Compute and set the hash code. |
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6216 inline void ConsStringReadBlockIntoBuffer(ReadBlockBuffer* buffer, | 6256 inline void ConsStringReadBlockIntoBuffer(ReadBlockBuffer* buffer, |
6217 unsigned* offset_ptr, | 6257 unsigned* offset_ptr, |
6218 unsigned chars); | 6258 unsigned chars); |
6219 | 6259 |
6220 // Minimum length for a cons string. | 6260 // Minimum length for a cons string. |
6221 static const int kMinLength = 13; | 6261 static const int kMinLength = 13; |
6222 | 6262 |
6223 typedef FixedBodyDescriptor<kFirstOffset, kSecondOffset + kPointerSize, kSize> | 6263 typedef FixedBodyDescriptor<kFirstOffset, kSecondOffset + kPointerSize, kSize> |
6224 BodyDescriptor; | 6264 BodyDescriptor; |
6225 | 6265 |
6266 #ifdef DEBUG | |
6267 void ConsStringVerify(); | |
6268 #endif | |
6269 | |
6226 private: | 6270 private: |
6227 DISALLOW_IMPLICIT_CONSTRUCTORS(ConsString); | 6271 DISALLOW_IMPLICIT_CONSTRUCTORS(ConsString); |
6228 }; | 6272 }; |
6229 | 6273 |
6230 | 6274 |
6275 class SlicedString: public String { | |
Vitaly Repeshko
2011/08/05 12:14:14
Please document classes. Explain that only slices
| |
6276 public: | |
6277 | |
6278 inline String* parent(); | |
6279 inline void set_parent(String* parent); | |
6280 inline int offset(); | |
6281 inline void set_offset(int offset); | |
6282 | |
6283 // Dispatched behavior. | |
6284 uint16_t SlicedStringGet(int index); | |
6285 | |
6286 // Casting. | |
6287 static inline SlicedString* cast(Object* obj); | |
6288 | |
6289 // Layout description. | |
6290 static const int kParentOffset = POINTER_SIZE_ALIGN(String::kSize); | |
6291 static const int kOffsetOffset = kParentOffset + kPointerSize; | |
6292 static const int kSize = kOffsetOffset + kPointerSize; | |
6293 | |
6294 // Support for StringInputBuffer | |
6295 inline const unibrow::byte* SlicedStringReadBlock(ReadBlockBuffer* buffer, | |
6296 unsigned* offset_ptr, | |
6297 unsigned chars); | |
6298 inline void SlicedStringReadBlockIntoBuffer(ReadBlockBuffer* buffer, | |
6299 unsigned* offset_ptr, | |
6300 unsigned chars); | |
6301 // Minimum length for a sliced string. | |
6302 static const int kMinLength = 13; | |
6303 | |
6304 typedef FixedBodyDescriptor<kParentOffset, | |
6305 kOffsetOffset + kPointerSize, kSize> | |
6306 BodyDescriptor; | |
6307 | |
6308 #ifdef DEBUG | |
6309 void SlicedStringVerify(); | |
6310 #endif | |
6311 | |
6312 private: | |
6313 DISALLOW_IMPLICIT_CONSTRUCTORS(SlicedString); | |
6314 }; | |
6315 | |
6316 | |
6231 // The ExternalString class describes string values that are backed by | 6317 // The ExternalString class describes string values that are backed by |
6232 // a string resource that lies outside the V8 heap. ExternalStrings | 6318 // a string resource that lies outside the V8 heap. ExternalStrings |
6233 // consist of the length field common to all strings, a pointer to the | 6319 // consist of the length field common to all strings, a pointer to the |
6234 // external resource. It is important to ensure (externally) that the | 6320 // external resource. It is important to ensure (externally) that the |
6235 // resource is not deallocated while the ExternalString is live in the | 6321 // resource is not deallocated while the ExternalString is live in the |
6236 // V8 heap. | 6322 // V8 heap. |
6237 // | 6323 // |
6238 // The API expects that all ExternalStrings are created through the | 6324 // The API expects that all ExternalStrings are created through the |
6239 // API. Therefore, ExternalStrings should not be used internally. | 6325 // API. Therefore, ExternalStrings should not be used internally. |
6240 class ExternalString: public String { | 6326 class ExternalString: public String { |
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7203 } else { | 7289 } else { |
7204 value &= ~(1 << bit_position); | 7290 value &= ~(1 << bit_position); |
7205 } | 7291 } |
7206 return value; | 7292 return value; |
7207 } | 7293 } |
7208 }; | 7294 }; |
7209 | 7295 |
7210 } } // namespace v8::internal | 7296 } } // namespace v8::internal |
7211 | 7297 |
7212 #endif // V8_OBJECTS_H_ | 7298 #endif // V8_OBJECTS_H_ |
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