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 EncodedJSValue JSC_HOST_CALL mathProtoFuncAbs(ExecState*);
  38 static EncodedJSValue JSC_HOST_CALL mathProtoFuncACos(ExecState*);
  39 static EncodedJSValue JSC_HOST_CALL mathProtoFuncASin(ExecState*);
  40 static EncodedJSValue JSC_HOST_CALL mathProtoFuncATan(ExecState*);
  41 static EncodedJSValue JSC_HOST_CALL mathProtoFuncATan2(ExecState*);
  42 static EncodedJSValue JSC_HOST_CALL mathProtoFuncCeil(ExecState*);
  43 static EncodedJSValue JSC_HOST_CALL mathProtoFuncCos(ExecState*);
  44 static EncodedJSValue JSC_HOST_CALL mathProtoFuncExp(ExecState*);
  45 static EncodedJSValue JSC_HOST_CALL mathProtoFuncFloor(ExecState*);
  46 static EncodedJSValue JSC_HOST_CALL mathProtoFuncLog(ExecState*);
  47 static EncodedJSValue JSC_HOST_CALL mathProtoFuncMax(ExecState*);
  48 static EncodedJSValue JSC_HOST_CALL mathProtoFuncMin(ExecState*);
  49 static EncodedJSValue JSC_HOST_CALL mathProtoFuncPow(ExecState*);
  50 static EncodedJSValue JSC_HOST_CALL mathProtoFuncRandom(ExecState*);
  51 static EncodedJSValue JSC_HOST_CALL mathProtoFuncRound(ExecState*);
  52 static EncodedJSValue JSC_HOST_CALL mathProtoFuncSin(ExecState*);
  53 static EncodedJSValue JSC_HOST_CALL mathProtoFuncSqrt(ExecState*);
  54 static EncodedJSValue JSC_HOST_CALL mathProtoFuncTan(ExecState*);
  55
  56 }
  57
  58 #include "MathObject.lut.h"
  59
  60 namespace JSC {
  61
  62 const ClassInfo MathObject::s_info = { "Math", &JSObjectWithGlobalObject::s_info, 0, ExecState::mathTable };
  63
  64 /* Source for MathObject.lut.h
  65 @begin mathTable
  66   abs           mathProtoFuncAbs               DontEnum|Function 1
  67   acos          mathProtoFuncACos              DontEnum|Function 1
  68   asin          mathProtoFuncASin              DontEnum|Function 1
  69   atan          mathProtoFuncATan              DontEnum|Function 1
  70   atan2         mathProtoFuncATan2             DontEnum|Function 2
  71   ceil          mathProtoFuncCeil              DontEnum|Function 1
  72   cos           mathProtoFuncCos               DontEnum|Function 1
  73   exp           mathProtoFuncExp               DontEnum|Function 1
  74   floor         mathProtoFuncFloor             DontEnum|Function 1
  75   log           mathProtoFuncLog               DontEnum|Function 1
  76   max           mathProtoFuncMax               DontEnum|Function 2
  77   min           mathProtoFuncMin               DontEnum|Function 2
  78   pow           mathProtoFuncPow               DontEnum|Function 2
  79   random        mathProtoFuncRandom            DontEnum|Function 0
  80   round         mathProtoFuncRound             DontEnum|Function 1
  81   sin           mathProtoFuncSin               DontEnum|Function 1
  82   sqrt          mathProtoFuncSqrt              DontEnum|Function 1
  83   tan           mathProtoFuncTan               DontEnum|Function 1
  84 @end
  85 */
  86
  87 MathObject::MathObject(ExecState* exec, JSGlobalObject* globalObject, Structure* structure)
  88     : JSObjectWithGlobalObject(globalObject, structure)
  89 {
  90     ASSERT(inherits(&s_info));
  91
  92     putDirectWithoutTransition(exec->globalData(), Identifier(exec, "E"), jsNumber(exp(1.0)), DontDelete | DontEnum | ReadOnly);
  93     putDirectWithoutTransition(exec->globalData(), Identifier(exec, "LN2"), jsNumber(log(2.0)), DontDelete | DontEnum | ReadOnly);
  94     putDirectWithoutTransition(exec->globalData(), Identifier(exec, "LN10"), jsNumber(log(10.0)), DontDelete | DontEnum | ReadOnly);
  95     putDirectWithoutTransition(exec->globalData(), Identifier(exec, "LOG2E"), jsNumber(1.0 / log(2.0)), DontDelete | DontEnum | ReadOnly);
  96     putDirectWithoutTransition(exec->globalData(), Identifier(exec, "LOG10E"), jsNumber(0.4342944819032518), DontDelete | DontEnum | ReadOnly); // See ECMA-262 15.8.1.5
  97     putDirectWithoutTransition(exec->globalData(), Identifier(exec, "PI"), jsNumber(piDouble), DontDelete | DontEnum | ReadOnly);
  98     putDirectWithoutTransition(exec->globalData(), Identifier(exec, "SQRT1_2"), jsNumber(sqrt(0.5)), DontDelete | DontEnum | ReadOnly);
  99     putDirectWithoutTransition(exec->globalData(), Identifier(exec, "SQRT2"), jsNumber(sqrt(2.0)), DontDelete | DontEnum | ReadOnly);
 100 }
 101
 102 bool MathObject::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot &slot)
 103 {
 104     return getStaticFunctionSlot<JSObject>(exec, ExecState::mathTable(exec), this, propertyName, slot);
 105 }
 106
 107 bool MathObject::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
 108 {
 109     return getStaticFunctionDescriptor<JSObject>(exec, ExecState::mathTable(exec), this, propertyName, descriptor);
 110 }
 111
 112 // ------------------------------ Functions --------------------------------
 113
 114 EncodedJSValue JSC_HOST_CALL mathProtoFuncAbs(ExecState* exec)
 115 {
 116     return JSValue::encode(jsNumber(fabs(exec->argument(0).toNumber(exec))));
 117 }
 118
 119 EncodedJSValue JSC_HOST_CALL mathProtoFuncACos(ExecState* exec)
 120 {
 121     return JSValue::encode(jsDoubleNumber(acos(exec->argument(0).toNumber(exec))));
 122 }
 123
 124 EncodedJSValue JSC_HOST_CALL mathProtoFuncASin(ExecState* exec)
 125 {
 126     return JSValue::encode(jsDoubleNumber(asin(exec->argument(0).toNumber(exec))));
 127 }
 128
 129 EncodedJSValue JSC_HOST_CALL mathProtoFuncATan(ExecState* exec)
 130 {
 131     return JSValue::encode(jsDoubleNumber(atan(exec->argument(0).toNumber(exec))));
 132 }
 133
 134 EncodedJSValue JSC_HOST_CALL mathProtoFuncATan2(ExecState* exec)
 135 {
 136     double arg0 = exec->argument(0).toNumber(exec);
 137     double arg1 = exec->argument(1).toNumber(exec);
 138     return JSValue::encode(jsDoubleNumber(atan2(arg0, arg1)));
 139 }
 140
 141 EncodedJSValue JSC_HOST_CALL mathProtoFuncCeil(ExecState* exec)
 142 {
 143     return JSValue::encode(jsNumber(ceil(exec->argument(0).toNumber(exec))));
 144 }
 145
 146 EncodedJSValue JSC_HOST_CALL mathProtoFuncCos(ExecState* exec)
 147 {
 148     return JSValue::encode(jsDoubleNumber(cos(exec->argument(0).toNumber(exec))));
 149 }
 150
 151 EncodedJSValue JSC_HOST_CALL mathProtoFuncExp(ExecState* exec)
 152 {
 153     return JSValue::encode(jsDoubleNumber(exp(exec->argument(0).toNumber(exec))));
 154 }
 155
 156 EncodedJSValue JSC_HOST_CALL mathProtoFuncFloor(ExecState* exec)
 157 {
 158     return JSValue::encode(jsNumber(floor(exec->argument(0).toNumber(exec))));
 159 }
 160
 161 EncodedJSValue JSC_HOST_CALL mathProtoFuncLog(ExecState* exec)
 162 {
 163     return JSValue::encode(jsDoubleNumber(log(exec->argument(0).toNumber(exec))));
 164 }
 165
 166 EncodedJSValue JSC_HOST_CALL mathProtoFuncMax(ExecState* exec)
 167 {
 168     unsigned argsCount = exec->argumentCount();
 169     double result = -Inf;
 170     for (unsigned k = 0; k < argsCount; ++k) {
 171         double val = exec->argument(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 JSValue::encode(jsNumber(result));
 180 }
 181
 182 EncodedJSValue JSC_HOST_CALL mathProtoFuncMin(ExecState* exec)
 183 {
 184     unsigned argsCount = exec->argumentCount();
 185     double result = +Inf;
 186     for (unsigned k = 0; k < argsCount; ++k) {
 187         double val = exec->argument(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 JSValue::encode(jsNumber(result));
 196 }
 197
 198 EncodedJSValue JSC_HOST_CALL mathProtoFuncPow(ExecState* exec)
 199 {
 200     // ECMA 15.8.2.1.13
 201
 202     double arg = exec->argument(0).toNumber(exec);
 203     double arg2 = exec->argument(1).toNumber(exec);
 204
 205     if (isnan(arg2))
 206         return JSValue::encode(jsNaN());
 207     if (isinf(arg2) && fabs(arg) == 1)
 208         return JSValue::encode(jsNaN());
 209     return JSValue::encode(jsNumber(pow(arg, arg2)));
 210 }
 211
 212 EncodedJSValue JSC_HOST_CALL mathProtoFuncRandom(ExecState* exec)
 213 {
 214     return JSValue::encode(jsDoubleNumber(exec->lexicalGlobalObject()->weakRandomNumber()));
 215 }
 216
 217 EncodedJSValue JSC_HOST_CALL mathProtoFuncRound(ExecState* exec)
 218 {
 219     double arg = exec->argument(0).toNumber(exec);
 220     double integer = ceil(arg);
 221     return JSValue::encode(jsNumber(integer - (integer - arg > 0.5)));
 222 }
 223
 224 EncodedJSValue JSC_HOST_CALL mathProtoFuncSin(ExecState* exec)
 225 {
 226     return JSValue::encode(exec->globalData().cachedSin(exec->argument(0).toNumber(exec)));
 227 }
 228
 229 EncodedJSValue JSC_HOST_CALL mathProtoFuncSqrt(ExecState* exec)
 230 {
 231     return JSValue::encode(jsDoubleNumber(sqrt(exec->argument(0).toNumber(exec))));
 232 }
 233
 234 EncodedJSValue JSC_HOST_CALL mathProtoFuncTan(ExecState* exec)
 235 {
 236     return JSValue::encode(jsDoubleNumber(tan(exec->argument(0).toNumber(exec))));
 237 }
 238
 239 } // namespace JSC