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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 // | 4 // |
5 // Review notes: | 5 // Review notes: |
6 // | 6 // |
7 // - The use of macros in these inline functions may seem superfluous | 7 // - The use of macros in these inline functions may seem superfluous |
8 // but it is absolutely needed to make sure gcc generates optimal | 8 // but it is absolutely needed to make sure gcc generates optimal |
9 // code. gcc is not happy when attempting to inline too deep. | 9 // code. gcc is not happy when attempting to inline too deep. |
10 // | 10 // |
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391 uint32_t StringShape::encoding_tag() { | 391 uint32_t StringShape::encoding_tag() { |
392 return type_ & kStringEncodingMask; | 392 return type_ & kStringEncodingMask; |
393 } | 393 } |
394 | 394 |
395 | 395 |
396 uint32_t StringShape::full_representation_tag() { | 396 uint32_t StringShape::full_representation_tag() { |
397 return (type_ & (kStringRepresentationMask | kStringEncodingMask)); | 397 return (type_ & (kStringRepresentationMask | kStringEncodingMask)); |
398 } | 398 } |
399 | 399 |
400 | 400 |
401 STATIC_CHECK((kStringRepresentationMask | kStringEncodingMask) == | 401 STATIC_ASSERT((kStringRepresentationMask | kStringEncodingMask) == |
402 Internals::kFullStringRepresentationMask); | 402 Internals::kFullStringRepresentationMask); |
403 | 403 |
404 STATIC_CHECK(static_cast<uint32_t>(kStringEncodingMask) == | 404 STATIC_ASSERT(static_cast<uint32_t>(kStringEncodingMask) == |
405 Internals::kStringEncodingMask); | 405 Internals::kStringEncodingMask); |
406 | 406 |
407 | 407 |
408 bool StringShape::IsSequentialAscii() { | 408 bool StringShape::IsSequentialAscii() { |
409 return full_representation_tag() == (kSeqStringTag | kOneByteStringTag); | 409 return full_representation_tag() == (kSeqStringTag | kOneByteStringTag); |
410 } | 410 } |
411 | 411 |
412 | 412 |
413 bool StringShape::IsSequentialTwoByte() { | 413 bool StringShape::IsSequentialTwoByte() { |
414 return full_representation_tag() == (kSeqStringTag | kTwoByteStringTag); | 414 return full_representation_tag() == (kSeqStringTag | kTwoByteStringTag); |
415 } | 415 } |
416 | 416 |
417 | 417 |
418 bool StringShape::IsExternalAscii() { | 418 bool StringShape::IsExternalAscii() { |
419 return full_representation_tag() == (kExternalStringTag | kOneByteStringTag); | 419 return full_representation_tag() == (kExternalStringTag | kOneByteStringTag); |
420 } | 420 } |
421 | 421 |
422 | 422 |
423 STATIC_CHECK((kExternalStringTag | kOneByteStringTag) == | 423 STATIC_ASSERT((kExternalStringTag | kOneByteStringTag) == |
424 Internals::kExternalAsciiRepresentationTag); | 424 Internals::kExternalAsciiRepresentationTag); |
425 | 425 |
426 STATIC_CHECK(v8::String::ASCII_ENCODING == kOneByteStringTag); | 426 STATIC_ASSERT(v8::String::ASCII_ENCODING == kOneByteStringTag); |
427 | 427 |
428 | 428 |
429 bool StringShape::IsExternalTwoByte() { | 429 bool StringShape::IsExternalTwoByte() { |
430 return full_representation_tag() == (kExternalStringTag | kTwoByteStringTag); | 430 return full_representation_tag() == (kExternalStringTag | kTwoByteStringTag); |
431 } | 431 } |
432 | 432 |
433 | 433 |
434 STATIC_CHECK((kExternalStringTag | kTwoByteStringTag) == | 434 STATIC_ASSERT((kExternalStringTag | kTwoByteStringTag) == |
435 Internals::kExternalTwoByteRepresentationTag); | 435 Internals::kExternalTwoByteRepresentationTag); |
436 | 436 |
437 STATIC_CHECK(v8::String::TWO_BYTE_ENCODING == kTwoByteStringTag); | 437 STATIC_ASSERT(v8::String::TWO_BYTE_ENCODING == kTwoByteStringTag); |
438 | 438 |
439 uc32 FlatStringReader::Get(int index) { | 439 uc32 FlatStringReader::Get(int index) { |
440 ASSERT(0 <= index && index <= length_); | 440 ASSERT(0 <= index && index <= length_); |
441 if (is_ascii_) { | 441 if (is_ascii_) { |
442 return static_cast<const byte*>(start_)[index]; | 442 return static_cast<const byte*>(start_)[index]; |
443 } else { | 443 } else { |
444 return static_cast<const uc16*>(start_)[index]; | 444 return static_cast<const uc16*>(start_)[index]; |
445 } | 445 } |
446 } | 446 } |
447 | 447 |
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6845 #undef READ_SHORT_FIELD | 6845 #undef READ_SHORT_FIELD |
6846 #undef WRITE_SHORT_FIELD | 6846 #undef WRITE_SHORT_FIELD |
6847 #undef READ_BYTE_FIELD | 6847 #undef READ_BYTE_FIELD |
6848 #undef WRITE_BYTE_FIELD | 6848 #undef WRITE_BYTE_FIELD |
6849 #undef NOBARRIER_READ_BYTE_FIELD | 6849 #undef NOBARRIER_READ_BYTE_FIELD |
6850 #undef NOBARRIER_WRITE_BYTE_FIELD | 6850 #undef NOBARRIER_WRITE_BYTE_FIELD |
6851 | 6851 |
6852 } } // namespace v8::internal | 6852 } } // namespace v8::internal |
6853 | 6853 |
6854 #endif // V8_OBJECTS_INL_H_ | 6854 #endif // V8_OBJECTS_INL_H_ |
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