| // Copyright 2013 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. |
| |
| 'use strict'; |
| |
| // ES6 draft 09-27-13, section 20.2.2.28. |
| function MathSign(x) { |
| x = TO_NUMBER_INLINE(x); |
| if (x > 0) return 1; |
| if (x < 0) return -1; |
| if (x === 0) return x; |
| return NAN; |
| } |
| |
| |
| // ES6 draft 09-27-13, section 20.2.2.34. |
| function MathTrunc(x) { |
| x = TO_NUMBER_INLINE(x); |
| if (x > 0) return MathFloor(x); |
| if (x < 0) return MathCeil(x); |
| if (x === 0) return x; |
| return NAN; |
| } |
| |
| |
| function ExtendMath() { |
| %CheckIsBootstrapping(); |
| |
| // Set up the non-enumerable functions on the Math object. |
| InstallFunctions($Math, DONT_ENUM, $Array( |
| "sign", MathSign, |
| "trunc", MathTrunc |
| )); |
| } |
| |
| ExtendMath(); |