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      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