runtime/MathObject.cpp

   1 /*
   2  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2007, 2008 Apple Inc. All Rights Reserved.
   4  *
   5  *  This library is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU Lesser General Public
   7  *  License as published by the Free Software Foundation; either
   8  *  version 2 of the License, or (at your option) any later version.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public
  16  *  License along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18  *
  19  */
  20
  21 #include "config.h"
  22 #include "MathObject.h"
  23
  24 #include "ObjectPrototype.h"
  25 #include "Operations.h"
  26 #include <time.h>
  27 #include <wtf/Assertions.h>
  28 #include <wtf/MathExtras.h>
  29 #include <wtf/RandomNumber.h>
  30 #include <wtf/RandomNumberSeed.h>
  31
  32 namespace JSC {
  33
  34 ASSERT_CLASS_FITS_IN_CELL(MathObject);
  35
  36 static JSValuePtr mathProtoFuncAbs(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  37 static JSValuePtr mathProtoFuncACos(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  38 static JSValuePtr mathProtoFuncASin(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  39 static JSValuePtr mathProtoFuncATan(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  40 static JSValuePtr mathProtoFuncATan2(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  41 static JSValuePtr mathProtoFuncCeil(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  42 static JSValuePtr mathProtoFuncCos(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  43 static JSValuePtr mathProtoFuncExp(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  44 static JSValuePtr mathProtoFuncFloor(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  45 static JSValuePtr mathProtoFuncLog(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  46 static JSValuePtr mathProtoFuncMax(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  47 static JSValuePtr mathProtoFuncMin(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  48 static JSValuePtr mathProtoFuncPow(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  49 static JSValuePtr mathProtoFuncRandom(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  50 static JSValuePtr mathProtoFuncRound(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  51 static JSValuePtr mathProtoFuncSin(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  52 static JSValuePtr mathProtoFuncSqrt(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  53 static JSValuePtr mathProtoFuncTan(ExecState*, JSObject*, JSValuePtr, const ArgList&);
  54
  55 }
  56
  57 #include "MathObject.lut.h"
  58
  59 namespace JSC {
  60
  61 // ------------------------------ MathObject --------------------------------
  62
  63 const ClassInfo MathObject::info = { "Math", 0, 0, ExecState::mathTable };
  64
  65 /* Source for MathObject.lut.h
  66 @begin mathTable
  67   abs           mathProtoFuncAbs               DontEnum|Function 1
  68   acos          mathProtoFuncACos              DontEnum|Function 1
  69   asin          mathProtoFuncASin              DontEnum|Function 1
  70   atan          mathProtoFuncATan              DontEnum|Function 1
  71   atan2         mathProtoFuncATan2             DontEnum|Function 2
  72   ceil          mathProtoFuncCeil              DontEnum|Function 1
  73   cos           mathProtoFuncCos               DontEnum|Function 1
  74   exp           mathProtoFuncExp               DontEnum|Function 1
  75   floor         mathProtoFuncFloor             DontEnum|Function 1
  76   log           mathProtoFuncLog               DontEnum|Function 1
  77   max           mathProtoFuncMax               DontEnum|Function 2
  78   min           mathProtoFuncMin               DontEnum|Function 2
  79   pow           mathProtoFuncPow               DontEnum|Function 2
  80   random        mathProtoFuncRandom            DontEnum|Function 0
  81   round         mathProtoFuncRound             DontEnum|Function 1
  82   sin           mathProtoFuncSin               DontEnum|Function 1
  83   sqrt          mathProtoFuncSqrt              DontEnum|Function 1
  84   tan           mathProtoFuncTan               DontEnum|Function 1
  85 @end
  86 */
  87
  88 MathObject::MathObject(ExecState* exec, PassRefPtr<Structure> structure)
  89     : JSObject(structure)
  90 {
  91     putDirectWithoutTransition(Identifier(exec, "E"), jsNumber(exec, exp(1.0)), DontDelete | DontEnum | ReadOnly);
  92     putDirectWithoutTransition(Identifier(exec, "LN2"), jsNumber(exec, log(2.0)), DontDelete | DontEnum | ReadOnly);
  93     putDirectWithoutTransition(Identifier(exec, "LN10"), jsNumber(exec, log(10.0)), DontDelete | DontEnum | ReadOnly);
  94     putDirectWithoutTransition(Identifier(exec, "LOG2E"), jsNumber(exec, 1.0 / log(2.0)), DontDelete | DontEnum | ReadOnly);
  95     putDirectWithoutTransition(Identifier(exec, "LOG10E"), jsNumber(exec, 1.0 / log(10.0)), DontDelete | DontEnum | ReadOnly);
  96     putDirectWithoutTransition(Identifier(exec, "PI"), jsNumber(exec, piDouble), DontDelete | DontEnum | ReadOnly);
  97     putDirectWithoutTransition(Identifier(exec, "SQRT1_2"), jsNumber(exec, sqrt(0.5)), DontDelete | DontEnum | ReadOnly);
  98     putDirectWithoutTransition(Identifier(exec, "SQRT2"), jsNumber(exec, sqrt(2.0)), DontDelete | DontEnum | ReadOnly);
  99     WTF::initializeWeakRandomNumberGenerator();
 100 }
 101
 102 // ECMA 15.8
 103
 104 bool MathObject::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot &slot)
 105 {
 106     const HashEntry* entry = ExecState::mathTable(exec)->entry(exec, propertyName);
 107
 108     if (!entry)
 109         return JSObject::getOwnPropertySlot(exec, propertyName, slot);
 110
 111     ASSERT(entry->attributes() & Function);
 112     setUpStaticFunctionSlot(exec, entry, this, propertyName, slot);
 113     return true;
 114 }
 115
 116 // ------------------------------ Functions --------------------------------
 117
 118 JSValuePtr mathProtoFuncAbs(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 119 {
 120     return jsNumber(exec, fabs(args.at(exec, 0).toNumber(exec)));
 121 }
 122
 123 JSValuePtr mathProtoFuncACos(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 124 {
 125     return jsNumber(exec, acos(args.at(exec, 0).toNumber(exec)));
 126 }
 127
 128 JSValuePtr mathProtoFuncASin(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 129 {
 130     return jsNumber(exec, asin(args.at(exec, 0).toNumber(exec)));
 131 }
 132
 133 JSValuePtr mathProtoFuncATan(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 134 {
 135     return jsNumber(exec, atan(args.at(exec, 0).toNumber(exec)));
 136 }
 137
 138 JSValuePtr mathProtoFuncATan2(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 139 {
 140     return jsNumber(exec, atan2(args.at(exec, 0).toNumber(exec), args.at(exec, 1).toNumber(exec)));
 141 }
 142
 143 JSValuePtr mathProtoFuncCeil(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 144 {
 145     return jsNumber(exec, ceil(args.at(exec, 0).toNumber(exec)));
 146 }
 147
 148 JSValuePtr mathProtoFuncCos(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 149 {
 150     return jsNumber(exec, cos(args.at(exec, 0).toNumber(exec)));
 151 }
 152
 153 JSValuePtr mathProtoFuncExp(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 154 {
 155     return jsNumber(exec, exp(args.at(exec, 0).toNumber(exec)));
 156 }
 157
 158 JSValuePtr mathProtoFuncFloor(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 159 {
 160     return jsNumber(exec, floor(args.at(exec, 0).toNumber(exec)));
 161 }
 162
 163 JSValuePtr mathProtoFuncLog(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 164 {
 165     return jsNumber(exec, log(args.at(exec, 0).toNumber(exec)));
 166 }
 167
 168 JSValuePtr mathProtoFuncMax(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 169 {
 170     unsigned argsCount = args.size();
 171     double result = -Inf;
 172     for (unsigned k = 0; k < argsCount; ++k) {
 173         double val = args.at(exec, k).toNumber(exec);
 174         if (isnan(val)) {
 175             result = NaN;
 176             break;
 177         }
 178         if (val > result || (val == 0 && result == 0 && !signbit(val)))
 179             result = val;
 180     }
 181     return jsNumber(exec, result);
 182 }
 183
 184 JSValuePtr mathProtoFuncMin(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 185 {
 186     unsigned argsCount = args.size();
 187     double result = +Inf;
 188     for (unsigned k = 0; k < argsCount; ++k) {
 189         double val = args.at(exec, k).toNumber(exec);
 190         if (isnan(val)) {
 191             result = NaN;
 192             break;
 193         }
 194         if (val < result || (val == 0 && result == 0 && signbit(val)))
 195             result = val;
 196     }
 197     return jsNumber(exec, result);
 198 }
 199
 200 JSValuePtr mathProtoFuncPow(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 201 {
 202     // ECMA 15.8.2.1.13
 203
 204     double arg = args.at(exec, 0).toNumber(exec);
 205     double arg2 = args.at(exec, 1).toNumber(exec);
 206
 207     if (isnan(arg2))
 208         return jsNaN(exec);
 209     if (isinf(arg2) && fabs(arg) == 1)
 210         return jsNaN(exec);
 211     return jsNumber(exec, pow(arg, arg2));
 212 }
 213
 214 JSValuePtr mathProtoFuncRandom(ExecState* exec, JSObject*, JSValuePtr, const ArgList&)
 215 {
 216     return jsNumber(exec, WTF::weakRandomNumber());
 217 }
 218
 219 JSValuePtr mathProtoFuncRound(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 220 {
 221     double arg = args.at(exec, 0).toNumber(exec);
 222     if (signbit(arg) && arg >= -0.5)
 223          return jsNumber(exec, -0.0);
 224     return jsNumber(exec, floor(arg + 0.5));
 225 }
 226
 227 JSValuePtr mathProtoFuncSin(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 228 {
 229     return jsNumber(exec, sin(args.at(exec, 0).toNumber(exec)));
 230 }
 231
 232 JSValuePtr mathProtoFuncSqrt(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 233 {
 234     return jsNumber(exec, sqrt(args.at(exec, 0).toNumber(exec)));
 235 }
 236
 237 JSValuePtr mathProtoFuncTan(ExecState* exec, JSObject*, JSValuePtr, const ArgList& args)
 238 {
 239     return jsNumber(exec, tan(args.at(exec, 0).toNumber(exec)));
 240 }
 241
 242 } // namespace JSC