1// Copyright 2013 the V8 project authors. All rights reserved. 2// Redistribution and use in source and binary forms, with or without 3// modification, are permitted provided that the following conditions are 4// met: 5// 6// * Redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer. 8// * Redistributions in binary form must reproduce the above 9// copyright notice, this list of conditions and the following 10// disclaimer in the documentation and/or other materials provided 11// with the distribution. 12// * Neither the name of Google Inc. nor the names of its 13// contributors may be used to endorse or promote products derived 14// from this software without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 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. 27 28'use strict'; 29 30// ES6 draft 09-27-13, section 20.2.2.28. 31function MathSign(x) { 32 x = TO_NUMBER_INLINE(x); 33 if (x > 0) return 1; 34 if (x < 0) return -1; 35 if (x === 0) return x; 36 return NAN; 37} 38 39 40// ES6 draft 09-27-13, section 20.2.2.34. 41function MathTrunc(x) { 42 x = TO_NUMBER_INLINE(x); 43 if (x > 0) return MathFloor(x); 44 if (x < 0) return MathCeil(x); 45 if (x === 0) return x; 46 return NAN; 47} 48 49 50function ExtendMath() { 51 %CheckIsBootstrapping(); 52 53 // Set up the non-enumerable functions on the Math object. 54 InstallFunctions($Math, DONT_ENUM, $Array( 55 "sign", MathSign, 56 "trunc", MathTrunc 57 )); 58} 59 60ExtendMath(); 61