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. 31 function 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. 41 function 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 50 function 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 60 ExtendMath(); 61