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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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| 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | 27 |
| 28 #ifndef V8_UTILS_H_ | 28 #ifndef V8_UTILS_H_ |
| 29 #define V8_UTILS_H_ | 29 #define V8_UTILS_H_ |
| 30 | 30 |
| 31 #include <stdlib.h> |
| 32 |
| 31 namespace v8 { namespace internal { | 33 namespace v8 { namespace internal { |
| 32 | 34 |
| 33 // ---------------------------------------------------------------------------- | 35 // ---------------------------------------------------------------------------- |
| 34 // General helper functions | 36 // General helper functions |
| 35 | 37 |
| 36 // Returns true iff x is a power of 2. Does not work for zero. | 38 // Returns true iff x is a power of 2. Does not work for zero. |
| 37 template <typename T> | 39 template <typename T> |
| 38 static inline bool IsPowerOf2(T x) { | 40 static inline bool IsPowerOf2(T x) { |
| 39 return (x & (x - 1)) == 0; | 41 return (x & (x - 1)) == 0; |
| 40 } | 42 } |
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| 501 src += kStepSize; | 503 src += kStepSize; |
| 502 } | 504 } |
| 503 } | 505 } |
| 504 #endif | 506 #endif |
| 505 while (dest < limit) { | 507 while (dest < limit) { |
| 506 *dest++ = static_cast<sinkchar>(*src++); | 508 *dest++ = static_cast<sinkchar>(*src++); |
| 507 } | 509 } |
| 508 } | 510 } |
| 509 | 511 |
| 510 | 512 |
| 511 static inline int Load16(const byte* pc) { | 513 static inline int Load16(const byte* ptr) { |
| 512 #ifdef CAN_READ_UNALIGNED | 514 #ifdef CAN_READ_UNALIGNED |
| 513 return *reinterpret_cast<const uint16_t*>(pc); | 515 return *reinterpret_cast<const uint16_t*>(ptr); |
| 514 #else | 516 #else |
| 515 uint32_t word; | 517 uint32_t word; |
| 516 word = pc[1]; | 518 word = ptr[1]; |
| 517 word |= pc[0] << 8; | 519 word |= ptr[0] << 8; |
| 518 return word; | 520 return word; |
| 519 #endif | 521 #endif |
| 520 } | 522 } |
| 521 | 523 |
| 522 | 524 |
| 523 static inline int Load32(const byte* pc) { | 525 static inline int Load32(const byte* ptr) { |
| 524 #ifdef CAN_READ_UNALIGNED | 526 #ifdef CAN_READ_UNALIGNED |
| 525 return *reinterpret_cast<const uint32_t*>(pc); | 527 return *reinterpret_cast<const uint32_t*>(ptr); |
| 526 #else | 528 #else |
| 527 uint32_t word; | 529 uint32_t word; |
| 528 word = pc[3]; | 530 word = ptr[3]; |
| 529 word |= pc[2] << 8; | 531 word |= ptr[2] << 8; |
| 530 word |= pc[1] << 16; | 532 word |= ptr[1] << 16; |
| 531 word |= pc[0] << 24; | 533 word |= ptr[0] << 24; |
| 532 return word; | 534 return word; |
| 533 #endif | 535 #endif |
| 534 } | 536 } |
| 535 | 537 |
| 536 | 538 |
| 537 static inline void Store16(byte* pc, uint16_t value) { | 539 static inline void Store16(byte* ptr, uint16_t value) { |
| 538 #ifdef CAN_READ_UNALIGNED | 540 #ifdef CAN_READ_UNALIGNED |
| 539 *reinterpret_cast<uint16_t*>(pc) = value; | 541 *reinterpret_cast<uint16_t*>(ptr) = value; |
| 540 #else | 542 #else |
| 541 pc[1] = value; | 543 ptr[1] = value; |
| 542 pc[0] = value >> 8; | 544 ptr[0] = value >> 8; |
| 543 #endif | 545 #endif |
| 544 } | 546 } |
| 545 | 547 |
| 546 | 548 |
| 547 static inline void Store32(byte* pc, uint32_t value) { | 549 static inline void Store32(byte* ptr, uint32_t value) { |
| 548 #ifdef CAN_READ_UNALIGNED | 550 #ifdef CAN_READ_UNALIGNED |
| 549 *reinterpret_cast<uint32_t*>(pc) = value; | 551 *reinterpret_cast<uint32_t*>(ptr) = value; |
| 550 #else | 552 #else |
| 551 pc[3] = value; | 553 ptr[3] = value; |
| 552 pc[2] = value >> 8; | 554 ptr[2] = value >> 8; |
| 553 pc[1] = value >> 16; | 555 ptr[1] = value >> 16; |
| 554 pc[0] = value >> 24; | 556 ptr[0] = value >> 24; |
| 555 #endif | 557 #endif |
| 556 } | 558 } |
| 557 | 559 |
| 558 | 560 |
| 559 | |
| 560 | |
| 561 | |
| 562 } } // namespace v8::internal | 561 } } // namespace v8::internal |
| 563 | 562 |
| 564 #endif // V8_UTILS_H_ | 563 #endif // V8_UTILS_H_ |
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