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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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225 // JSObject for GC purposes. The first four entries here have typeof | 225 // JSObject for GC purposes. The first four entries here have typeof |
226 // 'object', whereas JS_FUNCTION_TYPE has typeof 'function'. | 226 // 'object', whereas JS_FUNCTION_TYPE has typeof 'function'. |
227 #define INSTANCE_TYPE_LIST_ALL(V) \ | 227 #define INSTANCE_TYPE_LIST_ALL(V) \ |
228 V(SYMBOL_TYPE) \ | 228 V(SYMBOL_TYPE) \ |
229 V(ASCII_SYMBOL_TYPE) \ | 229 V(ASCII_SYMBOL_TYPE) \ |
230 V(CONS_SYMBOL_TYPE) \ | 230 V(CONS_SYMBOL_TYPE) \ |
231 V(CONS_ASCII_SYMBOL_TYPE) \ | 231 V(CONS_ASCII_SYMBOL_TYPE) \ |
232 V(EXTERNAL_SYMBOL_TYPE) \ | 232 V(EXTERNAL_SYMBOL_TYPE) \ |
233 V(EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE) \ | 233 V(EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE) \ |
234 V(EXTERNAL_ASCII_SYMBOL_TYPE) \ | 234 V(EXTERNAL_ASCII_SYMBOL_TYPE) \ |
| 235 V(SHORT_EXTERNAL_SYMBOL_TYPE) \ |
| 236 V(SHORT_EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE) \ |
| 237 V(SHORT_EXTERNAL_ASCII_SYMBOL_TYPE) \ |
235 V(STRING_TYPE) \ | 238 V(STRING_TYPE) \ |
236 V(ASCII_STRING_TYPE) \ | 239 V(ASCII_STRING_TYPE) \ |
237 V(CONS_STRING_TYPE) \ | 240 V(CONS_STRING_TYPE) \ |
238 V(CONS_ASCII_STRING_TYPE) \ | 241 V(CONS_ASCII_STRING_TYPE) \ |
239 V(SLICED_STRING_TYPE) \ | 242 V(SLICED_STRING_TYPE) \ |
240 V(EXTERNAL_STRING_TYPE) \ | 243 V(EXTERNAL_STRING_TYPE) \ |
241 V(EXTERNAL_STRING_WITH_ASCII_DATA_TYPE) \ | 244 V(EXTERNAL_STRING_WITH_ASCII_DATA_TYPE) \ |
242 V(EXTERNAL_ASCII_STRING_TYPE) \ | 245 V(EXTERNAL_ASCII_STRING_TYPE) \ |
| 246 V(SHORT_EXTERNAL_STRING_TYPE) \ |
| 247 V(SHORT_EXTERNAL_STRING_WITH_ASCII_DATA_TYPE) \ |
| 248 V(SHORT_EXTERNAL_ASCII_STRING_TYPE) \ |
243 V(PRIVATE_EXTERNAL_ASCII_STRING_TYPE) \ | 249 V(PRIVATE_EXTERNAL_ASCII_STRING_TYPE) \ |
244 \ | 250 \ |
245 V(MAP_TYPE) \ | 251 V(MAP_TYPE) \ |
246 V(CODE_TYPE) \ | 252 V(CODE_TYPE) \ |
247 V(ODDBALL_TYPE) \ | 253 V(ODDBALL_TYPE) \ |
248 V(JS_GLOBAL_PROPERTY_CELL_TYPE) \ | 254 V(JS_GLOBAL_PROPERTY_CELL_TYPE) \ |
249 \ | 255 \ |
250 V(HEAP_NUMBER_TYPE) \ | 256 V(HEAP_NUMBER_TYPE) \ |
251 V(FOREIGN_TYPE) \ | 257 V(FOREIGN_TYPE) \ |
252 V(BYTE_ARRAY_TYPE) \ | 258 V(BYTE_ARRAY_TYPE) \ |
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333 external_symbol, \ | 339 external_symbol, \ |
334 ExternalSymbol) \ | 340 ExternalSymbol) \ |
335 V(EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE, \ | 341 V(EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE, \ |
336 ExternalTwoByteString::kSize, \ | 342 ExternalTwoByteString::kSize, \ |
337 external_symbol_with_ascii_data, \ | 343 external_symbol_with_ascii_data, \ |
338 ExternalSymbolWithAsciiData) \ | 344 ExternalSymbolWithAsciiData) \ |
339 V(EXTERNAL_ASCII_SYMBOL_TYPE, \ | 345 V(EXTERNAL_ASCII_SYMBOL_TYPE, \ |
340 ExternalAsciiString::kSize, \ | 346 ExternalAsciiString::kSize, \ |
341 external_ascii_symbol, \ | 347 external_ascii_symbol, \ |
342 ExternalAsciiSymbol) \ | 348 ExternalAsciiSymbol) \ |
| 349 V(SHORT_EXTERNAL_SYMBOL_TYPE, \ |
| 350 ExternalTwoByteString::kShortSize, \ |
| 351 short_external_symbol, \ |
| 352 ShortExternalSymbol) \ |
| 353 V(SHORT_EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE, \ |
| 354 ExternalTwoByteString::kShortSize, \ |
| 355 short_external_symbol_with_ascii_data, \ |
| 356 ShortExternalSymbolWithAsciiData) \ |
| 357 V(SHORT_EXTERNAL_ASCII_SYMBOL_TYPE, \ |
| 358 ExternalAsciiString::kShortSize, \ |
| 359 short_external_ascii_symbol, \ |
| 360 ShortExternalAsciiSymbol) \ |
343 V(STRING_TYPE, \ | 361 V(STRING_TYPE, \ |
344 kVariableSizeSentinel, \ | 362 kVariableSizeSentinel, \ |
345 string, \ | 363 string, \ |
346 String) \ | 364 String) \ |
347 V(ASCII_STRING_TYPE, \ | 365 V(ASCII_STRING_TYPE, \ |
348 kVariableSizeSentinel, \ | 366 kVariableSizeSentinel, \ |
349 ascii_string, \ | 367 ascii_string, \ |
350 AsciiString) \ | 368 AsciiString) \ |
351 V(CONS_STRING_TYPE, \ | 369 V(CONS_STRING_TYPE, \ |
352 ConsString::kSize, \ | 370 ConsString::kSize, \ |
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368 ExternalTwoByteString::kSize, \ | 386 ExternalTwoByteString::kSize, \ |
369 external_string, \ | 387 external_string, \ |
370 ExternalString) \ | 388 ExternalString) \ |
371 V(EXTERNAL_STRING_WITH_ASCII_DATA_TYPE, \ | 389 V(EXTERNAL_STRING_WITH_ASCII_DATA_TYPE, \ |
372 ExternalTwoByteString::kSize, \ | 390 ExternalTwoByteString::kSize, \ |
373 external_string_with_ascii_data, \ | 391 external_string_with_ascii_data, \ |
374 ExternalStringWithAsciiData) \ | 392 ExternalStringWithAsciiData) \ |
375 V(EXTERNAL_ASCII_STRING_TYPE, \ | 393 V(EXTERNAL_ASCII_STRING_TYPE, \ |
376 ExternalAsciiString::kSize, \ | 394 ExternalAsciiString::kSize, \ |
377 external_ascii_string, \ | 395 external_ascii_string, \ |
378 ExternalAsciiString) | 396 ExternalAsciiString) \ |
| 397 V(SHORT_EXTERNAL_STRING_TYPE, \ |
| 398 ExternalTwoByteString::kShortSize, \ |
| 399 short_external_string, \ |
| 400 ShortExternalString) \ |
| 401 V(SHORT_EXTERNAL_STRING_WITH_ASCII_DATA_TYPE, \ |
| 402 ExternalTwoByteString::kShortSize, \ |
| 403 short_external_string_with_ascii_data, \ |
| 404 ShortExternalStringWithAsciiData) \ |
| 405 V(SHORT_EXTERNAL_ASCII_STRING_TYPE, \ |
| 406 ExternalAsciiString::kShortSize, \ |
| 407 short_external_ascii_string, \ |
| 408 ShortExternalAsciiString) |
379 | 409 |
380 // A struct is a simple object a set of object-valued fields. Including an | 410 // A struct is a simple object a set of object-valued fields. Including an |
381 // object type in this causes the compiler to generate most of the boilerplate | 411 // object type in this causes the compiler to generate most of the boilerplate |
382 // code for the class including allocation and garbage collection routines, | 412 // code for the class including allocation and garbage collection routines, |
383 // casts and predicates. All you need to define is the class, methods and | 413 // casts and predicates. All you need to define is the class, methods and |
384 // object verification routines. Easy, no? | 414 // object verification routines. Easy, no? |
385 // | 415 // |
386 // Note that for subtle reasons related to the ordering or numerical values of | 416 // Note that for subtle reasons related to the ordering or numerical values of |
387 // type tags, elements in this list have to be added to the INSTANCE_TYPE_LIST | 417 // type tags, elements in this list have to be added to the INSTANCE_TYPE_LIST |
388 // manually. | 418 // manually. |
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452 // Use this mask to distinguish between cons and slice only after making | 482 // Use this mask to distinguish between cons and slice only after making |
453 // sure that the string is one of the two (an indirect string). | 483 // sure that the string is one of the two (an indirect string). |
454 const uint32_t kSlicedNotConsMask = kSlicedStringTag & ~kConsStringTag; | 484 const uint32_t kSlicedNotConsMask = kSlicedStringTag & ~kConsStringTag; |
455 STATIC_ASSERT(IS_POWER_OF_TWO(kSlicedNotConsMask) && kSlicedNotConsMask != 0); | 485 STATIC_ASSERT(IS_POWER_OF_TWO(kSlicedNotConsMask) && kSlicedNotConsMask != 0); |
456 | 486 |
457 // If bit 7 is clear, then bit 3 indicates whether this two-byte | 487 // If bit 7 is clear, then bit 3 indicates whether this two-byte |
458 // string actually contains ascii data. | 488 // string actually contains ascii data. |
459 const uint32_t kAsciiDataHintMask = 0x08; | 489 const uint32_t kAsciiDataHintMask = 0x08; |
460 const uint32_t kAsciiDataHintTag = 0x08; | 490 const uint32_t kAsciiDataHintTag = 0x08; |
461 | 491 |
| 492 // If bit 7 is clear and string representation indicates an external string, |
| 493 // then bit 4 indicates whether the data pointer is cached. |
| 494 const uint32_t kShortExternalStringMask = 0x10; |
| 495 const uint32_t kShortExternalStringTag = 0x10; |
| 496 |
462 | 497 |
463 // 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 |
464 // for being shortcut by the garbage collector unless it is a | 499 // for being shortcut by the garbage collector unless it is a |
465 // 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 |
466 // shortcut them thereby avoiding turning symbols into strings. See | 501 // shortcut them thereby avoiding turning symbols into strings. See |
467 // heap.cc and mark-compact.cc. | 502 // heap.cc and mark-compact.cc. |
468 const uint32_t kShortcutTypeMask = | 503 const uint32_t kShortcutTypeMask = |
469 kIsNotStringMask | | 504 kIsNotStringMask | |
470 kIsSymbolMask | | 505 kIsSymbolMask | |
471 kStringRepresentationMask; | 506 kStringRepresentationMask; |
472 const uint32_t kShortcutTypeTag = kConsStringTag; | 507 const uint32_t kShortcutTypeTag = kConsStringTag; |
473 | 508 |
474 | 509 |
475 enum InstanceType { | 510 enum InstanceType { |
476 // String types. | 511 // String types. |
477 SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kSeqStringTag, | 512 SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kSeqStringTag, |
478 ASCII_SYMBOL_TYPE = kAsciiStringTag | kSymbolTag | kSeqStringTag, | 513 ASCII_SYMBOL_TYPE = kAsciiStringTag | kSymbolTag | kSeqStringTag, |
479 CONS_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kConsStringTag, | 514 CONS_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kConsStringTag, |
480 CONS_ASCII_SYMBOL_TYPE = kAsciiStringTag | kSymbolTag | kConsStringTag, | 515 CONS_ASCII_SYMBOL_TYPE = kAsciiStringTag | kSymbolTag | kConsStringTag, |
| 516 SHORT_EXTERNAL_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | |
| 517 kExternalStringTag | kShortExternalStringTag, |
| 518 SHORT_EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE = |
| 519 kTwoByteStringTag | kSymbolTag | kExternalStringTag | |
| 520 kAsciiDataHintTag | kShortExternalStringTag, |
| 521 SHORT_EXTERNAL_ASCII_SYMBOL_TYPE = kAsciiStringTag | kExternalStringTag | |
| 522 kSymbolTag | kShortExternalStringTag, |
481 EXTERNAL_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kExternalStringTag, | 523 EXTERNAL_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kExternalStringTag, |
482 EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE = | 524 EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE = |
483 kTwoByteStringTag | kSymbolTag | kExternalStringTag | kAsciiDataHintTag, | 525 kTwoByteStringTag | kSymbolTag | kExternalStringTag | kAsciiDataHintTag, |
484 EXTERNAL_ASCII_SYMBOL_TYPE = | 526 EXTERNAL_ASCII_SYMBOL_TYPE = |
485 kAsciiStringTag | kSymbolTag | kExternalStringTag, | 527 kAsciiStringTag | kSymbolTag | kExternalStringTag, |
486 STRING_TYPE = kTwoByteStringTag | kSeqStringTag, | 528 STRING_TYPE = kTwoByteStringTag | kSeqStringTag, |
487 ASCII_STRING_TYPE = kAsciiStringTag | kSeqStringTag, | 529 ASCII_STRING_TYPE = kAsciiStringTag | kSeqStringTag, |
488 CONS_STRING_TYPE = kTwoByteStringTag | kConsStringTag, | 530 CONS_STRING_TYPE = kTwoByteStringTag | kConsStringTag, |
489 CONS_ASCII_STRING_TYPE = kAsciiStringTag | kConsStringTag, | 531 CONS_ASCII_STRING_TYPE = kAsciiStringTag | kConsStringTag, |
490 SLICED_STRING_TYPE = kTwoByteStringTag | kSlicedStringTag, | 532 SLICED_STRING_TYPE = kTwoByteStringTag | kSlicedStringTag, |
491 SLICED_ASCII_STRING_TYPE = kAsciiStringTag | kSlicedStringTag, | 533 SLICED_ASCII_STRING_TYPE = kAsciiStringTag | kSlicedStringTag, |
| 534 SHORT_EXTERNAL_STRING_TYPE = |
| 535 kTwoByteStringTag | kExternalStringTag | kShortExternalStringTag, |
| 536 SHORT_EXTERNAL_STRING_WITH_ASCII_DATA_TYPE = |
| 537 kTwoByteStringTag | kExternalStringTag | |
| 538 kAsciiDataHintTag | kShortExternalStringTag, |
| 539 SHORT_EXTERNAL_ASCII_STRING_TYPE = |
| 540 kAsciiStringTag | kExternalStringTag | kShortExternalStringTag, |
492 EXTERNAL_STRING_TYPE = kTwoByteStringTag | kExternalStringTag, | 541 EXTERNAL_STRING_TYPE = kTwoByteStringTag | kExternalStringTag, |
493 EXTERNAL_STRING_WITH_ASCII_DATA_TYPE = | 542 EXTERNAL_STRING_WITH_ASCII_DATA_TYPE = |
494 kTwoByteStringTag | kExternalStringTag | kAsciiDataHintTag, | 543 kTwoByteStringTag | kExternalStringTag | kAsciiDataHintTag, |
495 // LAST_STRING_TYPE | 544 // LAST_STRING_TYPE |
496 EXTERNAL_ASCII_STRING_TYPE = kAsciiStringTag | kExternalStringTag, | 545 EXTERNAL_ASCII_STRING_TYPE = kAsciiStringTag | kExternalStringTag, |
497 PRIVATE_EXTERNAL_ASCII_STRING_TYPE = EXTERNAL_ASCII_STRING_TYPE, | 546 PRIVATE_EXTERNAL_ASCII_STRING_TYPE = EXTERNAL_ASCII_STRING_TYPE, |
498 | 547 |
499 // Objects allocated in their own spaces (never in new space). | 548 // Objects allocated in their own spaces (never in new space). |
500 MAP_TYPE = kNotStringTag, // FIRST_NONSTRING_TYPE | 549 MAP_TYPE = kNotStringTag, // FIRST_NONSTRING_TYPE |
501 CODE_TYPE, | 550 CODE_TYPE, |
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6748 // | 6797 // |
6749 // The API expects that all ExternalStrings are created through the | 6798 // The API expects that all ExternalStrings are created through the |
6750 // API. Therefore, ExternalStrings should not be used internally. | 6799 // API. Therefore, ExternalStrings should not be used internally. |
6751 class ExternalString: public String { | 6800 class ExternalString: public String { |
6752 public: | 6801 public: |
6753 // Casting | 6802 // Casting |
6754 static inline ExternalString* cast(Object* obj); | 6803 static inline ExternalString* cast(Object* obj); |
6755 | 6804 |
6756 // Layout description. | 6805 // Layout description. |
6757 static const int kResourceOffset = POINTER_SIZE_ALIGN(String::kSize); | 6806 static const int kResourceOffset = POINTER_SIZE_ALIGN(String::kSize); |
| 6807 static const int kShortSize = kResourceOffset + kPointerSize; |
6758 static const int kResourceDataOffset = kResourceOffset + kPointerSize; | 6808 static const int kResourceDataOffset = kResourceOffset + kPointerSize; |
6759 static const int kSize = kResourceDataOffset + kPointerSize; | 6809 static const int kSize = kResourceDataOffset + kPointerSize; |
6760 | 6810 |
6761 // Clear the cached pointer to the character array provided by the resource. | 6811 // Return whether external string is short (data pointer is not cached). |
6762 // This cache is updated the first time the character array is accessed. | 6812 inline bool is_short(); |
6763 inline void clear_data_cache(); | |
6764 | 6813 |
6765 STATIC_CHECK(kResourceOffset == Internals::kStringResourceOffset); | 6814 STATIC_CHECK(kResourceOffset == Internals::kStringResourceOffset); |
6766 | 6815 |
6767 private: | 6816 private: |
6768 DISALLOW_IMPLICIT_CONSTRUCTORS(ExternalString); | 6817 DISALLOW_IMPLICIT_CONSTRUCTORS(ExternalString); |
6769 }; | 6818 }; |
6770 | 6819 |
6771 | 6820 |
6772 // The ExternalAsciiString class is an external string backed by an | 6821 // The ExternalAsciiString class is an external string backed by an |
6773 // ASCII string. | 6822 // ASCII string. |
6774 class ExternalAsciiString: public ExternalString { | 6823 class ExternalAsciiString: public ExternalString { |
6775 public: | 6824 public: |
6776 static const bool kHasAsciiEncoding = true; | 6825 static const bool kHasAsciiEncoding = true; |
6777 | 6826 |
6778 typedef v8::String::ExternalAsciiStringResource Resource; | 6827 typedef v8::String::ExternalAsciiStringResource Resource; |
6779 | 6828 |
6780 // The underlying resource. | 6829 // The underlying resource. |
6781 inline const Resource* resource(); | 6830 inline const Resource* resource(); |
6782 inline void set_resource(const Resource* buffer); | 6831 inline void set_resource(const Resource* buffer); |
6783 | 6832 |
| 6833 // Update the pointer cache to the external character array. |
| 6834 // The cached pointer is always valid, as the external character array does = |
| 6835 // not move during lifetime. Deserialization is the only exception, after |
| 6836 // which the pointer cache has to be refreshed. |
| 6837 inline void update_data_cache(); |
| 6838 |
6784 inline const char* GetChars(); | 6839 inline const char* GetChars(); |
6785 | 6840 |
6786 // Dispatched behavior. | 6841 // Dispatched behavior. |
6787 inline uint16_t ExternalAsciiStringGet(int index); | 6842 inline uint16_t ExternalAsciiStringGet(int index); |
6788 | 6843 |
6789 // Casting. | 6844 // Casting. |
6790 static inline ExternalAsciiString* cast(Object* obj); | 6845 static inline ExternalAsciiString* cast(Object* obj); |
6791 | 6846 |
6792 // Garbage collection support. | 6847 // Garbage collection support. |
6793 inline void ExternalAsciiStringIterateBody(ObjectVisitor* v); | 6848 inline void ExternalAsciiStringIterateBody(ObjectVisitor* v); |
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6813 class ExternalTwoByteString: public ExternalString { | 6868 class ExternalTwoByteString: public ExternalString { |
6814 public: | 6869 public: |
6815 static const bool kHasAsciiEncoding = false; | 6870 static const bool kHasAsciiEncoding = false; |
6816 | 6871 |
6817 typedef v8::String::ExternalStringResource Resource; | 6872 typedef v8::String::ExternalStringResource Resource; |
6818 | 6873 |
6819 // The underlying string resource. | 6874 // The underlying string resource. |
6820 inline const Resource* resource(); | 6875 inline const Resource* resource(); |
6821 inline void set_resource(const Resource* buffer); | 6876 inline void set_resource(const Resource* buffer); |
6822 | 6877 |
| 6878 // Update the pointer cache to the external character array. |
| 6879 // The cached pointer is always valid, as the external character array does = |
| 6880 // not move during lifetime. Deserialization is the only exception, after |
| 6881 // which the pointer cache has to be refreshed. |
| 6882 inline void update_data_cache(); |
| 6883 |
6823 inline const uint16_t* GetChars(); | 6884 inline const uint16_t* GetChars(); |
6824 | 6885 |
6825 // Dispatched behavior. | 6886 // Dispatched behavior. |
6826 inline uint16_t ExternalTwoByteStringGet(int index); | 6887 inline uint16_t ExternalTwoByteStringGet(int index); |
6827 | 6888 |
6828 // For regexp code. | 6889 // For regexp code. |
6829 inline const uint16_t* ExternalTwoByteStringGetData(unsigned start); | 6890 inline const uint16_t* ExternalTwoByteStringGetData(unsigned start); |
6830 | 6891 |
6831 // Casting. | 6892 // Casting. |
6832 static inline ExternalTwoByteString* cast(Object* obj); | 6893 static inline ExternalTwoByteString* cast(Object* obj); |
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7884 } else { | 7945 } else { |
7885 value &= ~(1 << bit_position); | 7946 value &= ~(1 << bit_position); |
7886 } | 7947 } |
7887 return value; | 7948 return value; |
7888 } | 7949 } |
7889 }; | 7950 }; |
7890 | 7951 |
7891 } } // namespace v8::internal | 7952 } } // namespace v8::internal |
7892 | 7953 |
7893 #endif // V8_OBJECTS_H_ | 7954 #endif // V8_OBJECTS_H_ |
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