| // Copyright 2011 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef V8_V8CONVERSIONS_H_ |
| #define V8_V8CONVERSIONS_H_ |
| |
| #include "conversions.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| static inline bool IsMinusZero(double value) { |
| static const DoubleRepresentation minus_zero(-0.0); |
| return DoubleRepresentation(value) == minus_zero; |
| } |
| |
| |
| // Integer32 is an integer that can be represented as a signed 32-bit |
| // integer. It has to be in the range [-2^31, 2^31 - 1]. |
| // We also have to check for negative 0 as it is not an Integer32. |
| static inline bool IsInt32Double(double value) { |
| return !IsMinusZero(value) && |
| value >= kMinInt && |
| value <= kMaxInt && |
| value == FastI2D(FastD2I(value)); |
| } |
| |
| |
| // Convert from Number object to C integer. |
| inline int32_t NumberToInt32(Object* number) { |
| if (number->IsSmi()) return Smi::cast(number)->value(); |
| return DoubleToInt32(number->Number()); |
| } |
| |
| |
| inline uint32_t NumberToUint32(Object* number) { |
| if (number->IsSmi()) return Smi::cast(number)->value(); |
| return DoubleToUint32(number->Number()); |
| } |
| |
| |
| // Converts a string into a double value according to ECMA-262 9.3.1 |
| double StringToDouble(UnicodeCache* unicode_cache, |
| String* str, |
| int flags, |
| double empty_string_val = 0); |
| |
| // Converts a string into an integer. |
| double StringToInt(UnicodeCache* unicode_cache, String* str, int radix); |
| |
| inline bool TryNumberToSize(Isolate* isolate, |
| Object* number, size_t* result) { |
| SealHandleScope shs(isolate); |
| if (number->IsSmi()) { |
| int value = Smi::cast(number)->value(); |
| ASSERT( |
| static_cast<unsigned>(Smi::kMaxValue) |
| <= std::numeric_limits<size_t>::max()); |
| if (value >= 0) { |
| *result = static_cast<size_t>(value); |
| return true; |
| } |
| return false; |
| } else { |
| ASSERT(number->IsHeapNumber()); |
| double value = HeapNumber::cast(number)->value(); |
| if (value >= 0 && |
| value <= std::numeric_limits<size_t>::max()) { |
| *result = static_cast<size_t>(value); |
| return true; |
| } else { |
| return false; |
| } |
| } |
| } |
| |
| // Converts a number into size_t. |
| inline size_t NumberToSize(Isolate* isolate, |
| Object* number) { |
| size_t result = 0; |
| bool is_valid = TryNumberToSize(isolate, number, &result); |
| CHECK(is_valid); |
| return result; |
| } |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_V8CONVERSIONS_H_ |