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| 1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2012 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 |
| 11 // with the distribution. | 11 // with the distribution. |
| 12 // * Neither the name of Google Inc. nor the names of its | 12 // * Neither the name of Google Inc. nor the names of its |
| 13 // contributors may be used to endorse or promote products derived | 13 // contributors may be used to endorse or promote products derived |
| 14 // from this software without specific prior written permission. | 14 // from this software without specific prior written permission. |
| 15 // | 15 // |
| 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 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_CONVERSIONS_H_ | 28 #ifndef V8_CONVERSIONS_H_ |
| 29 #define V8_CONVERSIONS_H_ | 29 #define V8_CONVERSIONS_H_ |
| 30 | 30 |
| 31 #include "utils.h" | 31 #include "globals.h" |
| 32 | 32 |
| 33 namespace v8 { | 33 namespace v8 { |
| 34 namespace internal { | 34 namespace internal { |
| 35 | 35 |
| 36 class UnicodeCache; | 36 class UnicodeCache; |
| 37 template <typename T> class Vector; |
| 37 | 38 |
| 38 // Maximum number of significant digits in decimal representation. | 39 // Maximum number of significant digits in decimal representation. |
| 39 // The longest possible double in decimal representation is | 40 // The longest possible double in decimal representation is |
| 40 // (2^53 - 1) * 2 ^ -1074 that is (2 ^ 53 - 1) * 5 ^ 1074 / 10 ^ 1074 | 41 // (2^53 - 1) * 2 ^ -1074 that is (2 ^ 53 - 1) * 5 ^ 1074 / 10 ^ 1074 |
| 41 // (768 digits). If we parse a number whose first digits are equal to a | 42 // (768 digits). If we parse a number whose first digits are equal to a |
| 42 // mean of 2 adjacent doubles (that could have up to 769 digits) the result | 43 // mean of 2 adjacent doubles (that could have up to 769 digits) the result |
| 43 // must be rounded to the bigger one unless the tail consists of zeros, so | 44 // must be rounded to the bigger one unless the tail consists of zeros, so |
| 44 // we don't need to preserve all the digits. | 45 // we don't need to preserve all the digits. |
| 45 const int kMaxSignificantDigits = 772; | 46 const int kMaxSignificantDigits = 772; |
| 46 | 47 |
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| 88 | 89 |
| 89 // This function should match the exact semantics of ECMA-262 9.4. | 90 // This function should match the exact semantics of ECMA-262 9.4. |
| 90 inline double DoubleToInteger(double x); | 91 inline double DoubleToInteger(double x); |
| 91 | 92 |
| 92 | 93 |
| 93 // This function should match the exact semantics of ECMA-262 9.5. | 94 // This function should match the exact semantics of ECMA-262 9.5. |
| 94 inline int32_t DoubleToInt32(double x); | 95 inline int32_t DoubleToInt32(double x); |
| 95 | 96 |
| 96 | 97 |
| 97 // This function should match the exact semantics of ECMA-262 9.6. | 98 // This function should match the exact semantics of ECMA-262 9.6. |
| 98 inline uint32_t DoubleToUint32(double x) { | 99 inline uint32_t DoubleToUint32(double x); |
| 99 return static_cast<uint32_t>(DoubleToInt32(x)); | |
| 100 } | |
| 101 | 100 |
| 102 | 101 |
| 103 // Enumeration for allowing octals and ignoring junk when converting | 102 // Enumeration for allowing octals and ignoring junk when converting |
| 104 // strings to numbers. | 103 // strings to numbers. |
| 105 enum ConversionFlags { | 104 enum ConversionFlags { |
| 106 NO_FLAGS = 0, | 105 NO_FLAGS = 0, |
| 107 ALLOW_HEX = 1, | 106 ALLOW_HEX = 1, |
| 108 ALLOW_OCTALS = 2, | 107 ALLOW_OCTALS = 2, |
| 109 ALLOW_TRAILING_JUNK = 4 | 108 ALLOW_TRAILING_JUNK = 4 |
| 110 }; | 109 }; |
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| 139 // Additional number to string conversions for the number type. | 138 // Additional number to string conversions for the number type. |
| 140 // The caller is responsible for calling free on the returned pointer. | 139 // The caller is responsible for calling free on the returned pointer. |
| 141 char* DoubleToFixedCString(double value, int f); | 140 char* DoubleToFixedCString(double value, int f); |
| 142 char* DoubleToExponentialCString(double value, int f); | 141 char* DoubleToExponentialCString(double value, int f); |
| 143 char* DoubleToPrecisionCString(double value, int f); | 142 char* DoubleToPrecisionCString(double value, int f); |
| 144 char* DoubleToRadixCString(double value, int radix); | 143 char* DoubleToRadixCString(double value, int radix); |
| 145 | 144 |
| 146 } } // namespace v8::internal | 145 } } // namespace v8::internal |
| 147 | 146 |
| 148 #endif // V8_CONVERSIONS_H_ | 147 #endif // V8_CONVERSIONS_H_ |
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