// Copyright 2006-2008 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. // Keep reference to original values of some global properties. This // has the added benefit that the code in this file is isolated from // changes to these properties. const $Infinity = global.Infinity; const $floor = MathFloor; const $random = MathRandom; const $abs = MathAbs; // Instance class name can only be set on functions. That is the only // purpose for MathConstructor. function MathConstructor() {} %FunctionSetInstanceClassName(MathConstructor, 'Math'); const $Math = new MathConstructor(); $Math.__proto__ = global.Object.prototype; %SetProperty(global, "Math", $Math, DONT_ENUM); // ECMA 262 - 15.8.2.1 function MathAbs(x) { if (%_IsSmi(x)) return x >= 0 ? x : -x; if (!IS_NUMBER(x)) x = ToNumber(x); return %Math_abs(x); } // ECMA 262 - 15.8.2.2 function MathAcos(x) { if (!IS_NUMBER(x)) x = ToNumber(x); return %Math_acos(x); } // ECMA 262 - 15.8.2.3 function MathAsin(x) { if (!IS_NUMBER(x)) x = ToNumber(x); return %Math_asin(x); } // ECMA 262 - 15.8.2.4 function MathAtan(x) { if (!IS_NUMBER(x)) x = ToNumber(x); return %Math_atan(x); } // ECMA 262 - 15.8.2.5 // The naming of y and x matches the spec, as does the order in which // ToNumber (valueOf) is called. function MathAtan2(y, x) { if (!IS_NUMBER(y)) y = ToNumber(y); if (!IS_NUMBER(x)) x = ToNumber(x); return %Math_atan2(y, x); } // ECMA 262 - 15.8.2.6 function MathCeil(x) { if (!IS_NUMBER(x)) x = ToNumber(x); return %Math_ceil(x); } // ECMA 262 - 15.8.2.7 function MathCos(x) { if (!IS_NUMBER(x)) x = ToNumber(x); return %_Math_cos(x); } // ECMA 262 - 15.8.2.8 function MathExp(x) { if (!IS_NUMBER(x)) x = ToNumber(x); return %Math_exp(x); } // ECMA 262 - 15.8.2.9 function MathFloor(x) { if (!IS_NUMBER(x)) x = ToNumber(x); // It's more common to call this with a positive number that's out // of range than negative numbers; check the upper bound first. if (x <= 0x7FFFFFFF && x > 0) { // Numbers in the range [0, 2^31) can be floored by converting // them to an unsigned 32-bit value using the shift operator. // We avoid doing so for -0, because the result of Math.floor(-0) // has to be -0, which wouldn't be the case with the shift. return x << 0; } else { return %Math_floor(x); } } // ECMA 262 - 15.8.2.10 function MathLog(x) { if (!IS_NUMBER(x)) x = ToNumber(x); return %Math_log(x); } // ECMA 262 - 15.8.2.11 function MathMax(arg1, arg2) { // length == 2 var r = -$Infinity; var length = %_ArgumentsLength(); for (var i = 0; i < length; i++) { var n = ToNumber(%_Arguments(i)); if (NUMBER_IS_NAN(n)) return n; // Make sure +0 is considered greater than -0. if (n > r || (r === 0 && n === 0 && !%_IsSmi(r))) r = n; } return r; } // ECMA 262 - 15.8.2.12 function MathMin(arg1, arg2) { // length == 2 var r = $Infinity; var length = %_ArgumentsLength(); for (var i = 0; i < length; i++) { var n = ToNumber(%_Arguments(i)); if (NUMBER_IS_NAN(n)) return n; // Make sure -0 is considered less than +0. if (n < r || (r === 0 && n === 0 && !%_IsSmi(n))) r = n; } return r; } // ECMA 262 - 15.8.2.13 function MathPow(x, y) { if (!IS_NUMBER(x)) x = ToNumber(x); if (!IS_NUMBER(y)) y = ToNumber(y); return %Math_pow(x, y); } // ECMA 262 - 15.8.2.14 function MathRandom() { return %_RandomPositiveSmi() / 0x40000000; } // ECMA 262 - 15.8.2.15 function MathRound(x) { if (!IS_NUMBER(x)) x = ToNumber(x); return %Math_round(x); } // ECMA 262 - 15.8.2.16 function MathSin(x) { if (!IS_NUMBER(x)) x = ToNumber(x); return %_Math_sin(x); } // ECMA 262 - 15.8.2.17 function MathSqrt(x) { if (!IS_NUMBER(x)) x = ToNumber(x); return %Math_sqrt(x); } // ECMA 262 - 15.8.2.18 function MathTan(x) { if (!IS_NUMBER(x)) x = ToNumber(x); return %Math_tan(x); } // ------------------------------------------------------------------- function SetupMath() { // Setup math constants. // ECMA-262, section 15.8.1.1. %OptimizeObjectForAddingMultipleProperties($Math, 8); %SetProperty($Math, "E", 2.7182818284590452354, DONT_ENUM | DONT_DELETE | READ_ONLY); // ECMA-262, section 15.8.1.2. %SetProperty($Math, "LN10", 2.302585092994046, DONT_ENUM | DONT_DELETE | READ_ONLY); // ECMA-262, section 15.8.1.3. %SetProperty($Math, "LN2", 0.6931471805599453, DONT_ENUM | DONT_DELETE | READ_ONLY); // ECMA-262, section 15.8.1.4. %SetProperty($Math, "LOG2E", 1.4426950408889634, DONT_ENUM | DONT_DELETE | READ_ONLY); %SetProperty($Math, "LOG10E", 0.43429448190325176, DONT_ENUM | DONT_DELETE | READ_ONLY); %SetProperty($Math, "PI", 3.1415926535897932, DONT_ENUM | DONT_DELETE | READ_ONLY); %SetProperty($Math, "SQRT1_2", 0.7071067811865476, DONT_ENUM | DONT_DELETE | READ_ONLY); %SetProperty($Math, "SQRT2", 1.4142135623730951, DONT_ENUM | DONT_DELETE | READ_ONLY); %TransformToFastProperties($Math); // Setup non-enumerable functions of the Math object and // set their names. InstallFunctionsOnHiddenPrototype($Math, DONT_ENUM, $Array( "random", MathRandom, "abs", MathAbs, "acos", MathAcos, "asin", MathAsin, "atan", MathAtan, "ceil", MathCeil, "cos", MathCos, "exp", MathExp, "floor", MathFloor, "log", MathLog, "round", MathRound, "sin", MathSin, "sqrt", MathSqrt, "tan", MathTan, "atan2", MathAtan2, "pow", MathPow, "max", MathMax, "min", MathMin )); }; SetupMath();