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 "Lookup.h"
  25 #include "ObjectPrototype.h"
  26 #include "Operations.h"
  27 #include <time.h>
  28 #include <wtf/Assertions.h>
  29 #include <wtf/MathExtras.h>
  30 #include <wtf/RandomNumber.h>
  31 #include <wtf/RandomNumberSeed.h>
  32
  33 namespace JSC {
  34
  35 ASSERT_CLASS_FITS_IN_CELL(MathObject);
  36
  37 static JSValue JSC_HOST_CALL mathProtoFuncAbs(ExecState*, JSObject*, JSValue, const ArgList&);
  38 static JSValue JSC_HOST_CALL mathProtoFuncACos(ExecState*, JSObject*, JSValue, const ArgList&);
  39 static JSValue JSC_HOST_CALL mathProtoFuncASin(ExecState*, JSObject*, JSValue, const ArgList&);
  40 static JSValue JSC_HOST_CALL mathProtoFuncATan(ExecState*, JSObject*, JSValue, const ArgList&);
  41 static JSValue JSC_HOST_CALL mathProtoFuncATan2(ExecState*, JSObject*, JSValue, const ArgList&);
  42 static JSValue JSC_HOST_CALL mathProtoFuncCeil(ExecState*, JSObject*, JSValue, const ArgList&);
  43 static JSValue JSC_HOST_CALL mathProtoFuncCos(ExecState*, JSObject*, JSValue, const ArgList&);
  44 static JSValue JSC_HOST_CALL mathProtoFuncExp(ExecState*, JSObject*, JSValue, const ArgList&);
  45 static JSValue JSC_HOST_CALL mathProtoFuncFloor(ExecState*, JSObject*, JSValue, const ArgList&);
  46 static JSValue JSC_HOST_CALL mathProtoFuncLog(ExecState*, JSObject*, JSValue, const ArgList&);
  47 static JSValue JSC_HOST_CALL mathProtoFuncMax(ExecState*, JSObject*, JSValue, const ArgList&);
  48 static JSValue JSC_HOST_CALL mathProtoFuncMin(ExecState*, JSObject*, JSValue, const ArgList&);
  49 static JSValue JSC_HOST_CALL mathProtoFuncPow(ExecState*, JSObject*, JSValue, const ArgList&);
  50 static JSValue JSC_HOST_CALL mathProtoFuncRandom(ExecState*, JSObject*, JSValue, const ArgList&);
  51 static JSValue JSC_HOST_CALL mathProtoFuncRound(ExecState*, JSObject*, JSValue, const ArgList&);
  52 static JSValue JSC_HOST_CALL mathProtoFuncSin(ExecState*, JSObject*, JSValue, const ArgList&);
  53 static JSValue JSC_HOST_CALL mathProtoFuncSqrt(ExecState*, JSObject*, JSValue, const ArgList&);
  54 static JSValue JSC_HOST_CALL mathProtoFuncTan(ExecState*, JSObject*, JSValue, const ArgList&);
  55
  56 }
  57
  58 #include "MathObject.lut.h"
  59
  60 namespace JSC {
  61
  62 // ------------------------------ MathObject --------------------------------
  63
  64 const ClassInfo MathObject::info = { "Math", 0, 0, ExecState::mathTable };
  65
  66 /* Source for MathObject.lut.h
  67 @begin mathTable
  68   abs           mathProtoFuncAbs               DontEnum|Function 1
  69   acos          mathProtoFuncACos              DontEnum|Function 1
  70   asin          mathProtoFuncASin              DontEnum|Function 1
  71   atan          mathProtoFuncATan              DontEnum|Function 1
  72   atan2         mathProtoFuncATan2             DontEnum|Function 2
  73   ceil          mathProtoFuncCeil              DontEnum|Function 1
  74   cos           mathProtoFuncCos               DontEnum|Function 1
  75   exp           mathProtoFuncExp               DontEnum|Function 1
  76   floor         mathProtoFuncFloor             DontEnum|Function 1
  77   log           mathProtoFuncLog               DontEnum|Function 1
  78   max           mathProtoFuncMax               DontEnum|Function 2
  79   min           mathProtoFuncMin               DontEnum|Function 2
  80   pow           mathProtoFuncPow               DontEnum|Function 2
  81   random        mathProtoFuncRandom            DontEnum|Function 0
  82   round         mathProtoFuncRound             DontEnum|Function 1
  83   sin           mathProtoFuncSin               DontEnum|Function 1
  84   sqrt          mathProtoFuncSqrt              DontEnum|Function 1
  85   tan           mathProtoFuncTan               DontEnum|Function 1
  86 @end
  87 */
  88
  89 MathObject::MathObject(ExecState* exec, NonNullPassRefPtr<Structure> structure)
  90     : JSObject(structure)
  91 {
  92     putDirectWithoutTransition(Identifier(exec, "E"), jsNumber(exec, exp(1.0)), DontDelete | DontEnum | ReadOnly);
  93     putDirectWithoutTransition(Identifier(exec, "LN2"), jsNumber(exec, log(2.0)), DontDelete | DontEnum | ReadOnly);
  94     putDirectWithoutTransition(Identifier(exec, "LN10"), jsNumber(exec, log(10.0)), DontDelete | DontEnum | ReadOnly);
  95     putDirectWithoutTransition(Identifier(exec, "LOG2E"), jsNumber(exec, 1.0 / log(2.0)), DontDelete | DontEnum | ReadOnly);
  96     putDirectWithoutTransition(Identifier(exec, "LOG10E"), jsNumber(exec, 1.0 / log(10.0)), DontDelete | DontEnum | ReadOnly);
  97     putDirectWithoutTransition(Identifier(exec, "PI"), jsNumber(exec, piDouble), DontDelete | DontEnum | ReadOnly);
  98     putDirectWithoutTransition(Identifier(exec, "SQRT1_2"), jsNumber(exec, sqrt(0.5)), DontDelete | DontEnum | ReadOnly);
  99     putDirectWithoutTransition(Identifier(exec, "SQRT2"), jsNumber(exec, sqrt(2.0)), DontDelete | DontEnum | ReadOnly);
 100 }
 101
 102 // ECMA 15.8
 103
 104 bool MathObject::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot &slot)
 105 {
 106     return getStaticFunctionSlot<JSObject>(exec, ExecState::mathTable(exec), this, propertyName, slot);
 107 }
 108
 109 bool MathObject::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
 110 {
 111     return getStaticFunctionDescriptor<JSObject>(exec, ExecState::mathTable(exec), this, propertyName, descriptor);
 112 }
 113
 114 // ------------------------------ Functions --------------------------------
 115
 116 JSValue JSC_HOST_CALL mathProtoFuncAbs(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 117 {
 118     return jsNumber(exec, fabs(args.at(0).toNumber(exec)));
 119 }
 120
 121 JSValue JSC_HOST_CALL mathProtoFuncACos(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 122 {
 123     return jsDoubleNumber(exec, acos(args.at(0).toNumber(exec)));
 124 }
 125
 126 JSValue JSC_HOST_CALL mathProtoFuncASin(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 127 {
 128     return jsDoubleNumber(exec, asin(args.at(0).toNumber(exec)));
 129 }
 130
 131 JSValue JSC_HOST_CALL mathProtoFuncATan(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 132 {
 133     return jsDoubleNumber(exec, atan(args.at(0).toNumber(exec)));
 134 }
 135
 136 JSValue JSC_HOST_CALL mathProtoFuncATan2(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 137 {
 138     return jsDoubleNumber(exec, atan2(args.at(0).toNumber(exec), args.at(1).toNumber(exec)));
 139 }
 140
 141 JSValue JSC_HOST_CALL mathProtoFuncCeil(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 142 {
 143     return jsNumber(exec, ceil(args.at(0).toNumber(exec)));
 144 }
 145
 146 JSValue JSC_HOST_CALL mathProtoFuncCos(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 147 {
 148     return jsDoubleNumber(exec, cos(args.at(0).toNumber(exec)));
 149 }
 150
 151 JSValue JSC_HOST_CALL mathProtoFuncExp(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 152 {
 153     return jsDoubleNumber(exec, exp(args.at(0).toNumber(exec)));
 154 }
 155
 156 JSValue JSC_HOST_CALL mathProtoFuncFloor(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 157 {
 158     return jsNumber(exec, floor(args.at(0).toNumber(exec)));
 159 }
 160
 161 JSValue JSC_HOST_CALL mathProtoFuncLog(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 162 {
 163     return jsDoubleNumber(exec, log(args.at(0).toNumber(exec)));
 164 }
 165
 166 JSValue JSC_HOST_CALL mathProtoFuncMax(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 167 {
 168     unsigned argsCount = args.size();
 169     double result = -Inf;
 170     for (unsigned k = 0; k < argsCount; ++k) {
 171         double val = args.at(k).toNumber(exec);
 172         if (isnan(val)) {
 173             result = NaN;
 174             break;
 175         }
 176         if (val > result || (val == 0 && result == 0 && !signbit(val)))
 177             result = val;
 178     }
 179     return jsNumber(exec, result);
 180 }
 181
 182 JSValue JSC_HOST_CALL mathProtoFuncMin(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 183 {
 184     unsigned argsCount = args.size();
 185     double result = +Inf;
 186     for (unsigned k = 0; k < argsCount; ++k) {
 187         double val = args.at(k).toNumber(exec);
 188         if (isnan(val)) {
 189             result = NaN;
 190             break;
 191         }
 192         if (val < result || (val == 0 && result == 0 && signbit(val)))
 193             result = val;
 194     }
 195     return jsNumber(exec, result);
 196 }
 197
 198 JSValue JSC_HOST_CALL mathProtoFuncPow(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 199 {
 200     // ECMA 15.8.2.1.13
 201
 202     double arg = args.at(0).toNumber(exec);
 203     double arg2 = args.at(1).toNumber(exec);
 204
 205     if (isnan(arg2))
 206         return jsNaN(exec);
 207     if (isinf(arg2) && fabs(arg) == 1)
 208         return jsNaN(exec);
 209     return jsNumber(exec, pow(arg, arg2));
 210 }
 211
 212 JSValue JSC_HOST_CALL mathProtoFuncRandom(ExecState* exec, JSObject*, JSValue, const ArgList&)
 213 {
 214     return jsDoubleNumber(exec, exec->lexicalGlobalObject()->weakRandomNumber());
 215 }
 216
 217 JSValue JSC_HOST_CALL mathProtoFuncRound(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 218 {
 219     double arg = args.at(0).toNumber(exec);
 220     double integer = ceil(arg);
 221     return jsNumber(exec, integer - (integer - arg > 0.5));
 222 }
 223
 224 JSValue JSC_HOST_CALL mathProtoFuncSin(ExecState* exec, JSObject*, JSValue, const ArgList& args)
 225 {
 226     return exec->globalData().cachedSin(exec, 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