JavaScriptCore/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 JSValue JSC_HOST_CALL mathProtoFuncAbs(ExecState*, JSObject*, JSValue, const ArgList&);
  37 static JSValue JSC_HOST_CALL mathProtoFuncACos(ExecState*, JSObject*, JSValue, const ArgList&);
  38 static JSValue JSC_HOST_CALL mathProtoFuncASin(ExecState*, JSObject*, JSValue, const ArgList&);
  39 static JSValue JSC_HOST_CALL mathProtoFuncATan(ExecState*, JSObject*, JSValue, const ArgList&);
  40 static JSValue JSC_HOST_CALL mathProtoFuncATan2(ExecState*, JSObject*, JSValue, const ArgList&);
  41 static JSValue JSC_HOST_CALL mathProtoFuncCeil(ExecState*, JSObject*, JSValue, const ArgList&);
  42 static JSValue JSC_HOST_CALL mathProtoFuncCos(ExecState*, JSObject*, JSValue, const ArgList&);
  43 static JSValue JSC_HOST_CALL mathProtoFuncExp(ExecState*, JSObject*, JSValue, const ArgList&);
  44 static JSValue JSC_HOST_CALL mathProtoFuncFloor(ExecState*, JSObject*, JSValue, const ArgList&);
  45 static JSValue JSC_HOST_CALL mathProtoFuncLog(ExecState*, JSObject*, JSValue, const ArgList&);
  46 static JSValue JSC_HOST_CALL mathProtoFuncMax(ExecState*, JSObject*, JSValue, const ArgList&);
  47 static JSValue JSC_HOST_CALL mathProtoFuncMin(ExecState*, JSObject*, JSValue, const ArgList&);
  48 static JSValue JSC_HOST_CALL mathProtoFuncPow(ExecState*, JSObject*, JSValue, const ArgList&);
  49 static JSValue JSC_HOST_CALL mathProtoFuncRandom(ExecState*, JSObject*, JSValue, const ArgList&);
  50 static JSValue JSC_HOST_CALL mathProtoFuncRound(ExecState*, JSObject*, JSValue, const ArgList&);
  51 static JSValue JSC_HOST_CALL mathProtoFuncSin(ExecState*, JSObject*, JSValue, const ArgList&);
  52 static JSValue JSC_HOST_CALL mathProtoFuncSqrt(ExecState*, JSObject*, JSValue, const ArgList&);
  53 static JSValue JSC_HOST_CALL mathProtoFuncTan(ExecState*, JSObject*, JSValue, 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, NonNullPassRefPtr<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 }
 100
 101 // ECMA 15.8
 102
 103 bool MathObject::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot &slot)
 104 {
 105     return getStaticFunctionSlot<JSObject>(exec, ExecState::mathTable(exec), this, propertyName, slot);
 106 }
 107
 108 bool MathObject::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
 109 {
 110     return getStaticFunctionDescriptor<JSObject>(exec, ExecState::mathTable(exec), this, propertyName, descriptor);
 111 }
 112
 113 // ------------------------------ Functions --------------------------------
 114
 115 JSValue JSC_HOST_CALL mathProtoFuncAbs(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 116 {
 117     return jsNumber(exec, fabs(args.at(0).toNumber(exec)));
 118 }
 119
 120 JSValue JSC_HOST_CALL mathProtoFuncACos(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 121 {
 122     return jsDoubleNumber(exec, acos(args.at(0).toNumber(exec)));
 123 }
 124
 125 JSValue JSC_HOST_CALL mathProtoFuncASin(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 126 {
 127     return jsDoubleNumber(exec, asin(args.at(0).toNumber(exec)));
 128 }
 129
 130 JSValue JSC_HOST_CALL mathProtoFuncATan(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 131 {
 132     return jsDoubleNumber(exec, atan(args.at(0).toNumber(exec)));
 133 }
 134
 135 JSValue JSC_HOST_CALL mathProtoFuncATan2(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 136 {
 137     return jsDoubleNumber(exec, atan2(args.at(0).toNumber(exec), args.at(1).toNumber(exec)));
 138 }
 139
 140 JSValue JSC_HOST_CALL mathProtoFuncCeil(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 141 {
 142     return jsNumber(exec, ceil(args.at(0).toNumber(exec)));
 143 }
 144
 145 JSValue JSC_HOST_CALL mathProtoFuncCos(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 146 {
 147     return jsDoubleNumber(exec, cos(args.at(0).toNumber(exec)));
 148 }
 149
 150 JSValue JSC_HOST_CALL mathProtoFuncExp(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 151 {
 152     return jsDoubleNumber(exec, exp(args.at(0).toNumber(exec)));
 153 }
 154
 155 JSValue JSC_HOST_CALL mathProtoFuncFloor(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 156 {
 157     return jsNumber(exec, floor(args.at(0).toNumber(exec)));
 158 }
 159
 160 JSValue JSC_HOST_CALL mathProtoFuncLog(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 161 {
 162     return jsDoubleNumber(exec, log(args.at(0).toNumber(exec)));
 163 }
 164
 165 JSValue JSC_HOST_CALL mathProtoFuncMax(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 166 {
 167     unsigned argsCount = args.size();
 168     double result = -Inf;
 169     for (unsigned k = 0; k < argsCount; ++k) {
 170         double val = args.at(k).toNumber(exec);
 171         if (isnan(val)) {
 172             result = NaN;
 173             break;
 174         }
 175         if (val > result || (val == 0 && result == 0 && !signbit(val)))
 176             result = val;
 177     }
 178     return jsNumber(exec, result);
 179 }
 180
 181 JSValue JSC_HOST_CALL mathProtoFuncMin(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 182 {
 183     unsigned argsCount = args.size();
 184     double result = +Inf;
 185     for (unsigned k = 0; k < argsCount; ++k) {
 186         double val = args.at(k).toNumber(exec);
 187         if (isnan(val)) {
 188             result = NaN;
 189             break;
 190         }
 191         if (val < result || (val == 0 && result == 0 && signbit(val)))
 192             result = val;
 193     }
 194     return jsNumber(exec, result);
 195 }
 196
 197 JSValue JSC_HOST_CALL mathProtoFuncPow(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 198 {
 199     // ECMA 15.8.2.1.13
 200
 201     double arg = args.at(0).toNumber(exec);
 202     double arg2 = args.at(1).toNumber(exec);
 203
 204     if (isnan(arg2))
 205         return jsNaN(exec);
 206     if (isinf(arg2) && fabs(arg) == 1)
 207         return jsNaN(exec);
 208     return jsNumber(exec, pow(arg, arg2));
 209 }
 210
 211 JSValue JSC_HOST_CALL mathProtoFuncRandom(ExecState* exec, JSObject*, JSValue, const ArgList&)
 212 {
 213     return jsDoubleNumber(exec, exec->globalData().weakRandom.get());
 214 }
 215
 216 JSValue JSC_HOST_CALL mathProtoFuncRound(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 217 {
 218     double arg = args.at(0).toNumber(exec);
 219     if (signbit(arg) && arg >= -0.5)
 220          return jsNumber(exec, -0.0);
 221     return jsNumber(exec, floor(arg + 0.5));
 222 }
 223
 224 JSValue JSC_HOST_CALL mathProtoFuncSin(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 225 {
 226     return jsDoubleNumber(exec, sin(args.at(0).toNumber(exec)));
 227 }
 228
 229 JSValue JSC_HOST_CALL mathProtoFuncSqrt(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 230 {
 231     return jsDoubleNumber(exec, sqrt(args.at(0).toNumber(exec)));
 232 }
 233
 234 JSValue JSC_HOST_CALL mathProtoFuncTan(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 235 {
 236     return jsDoubleNumber(exec, tan(args.at(0).toNumber(exec)));
 237 }
 238
 239 } // namespace JSC