runtime/MathObject.cpp

   1 /*
   2  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2007, 2008, 2013 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 "MathCommon.h"
  26 #include "ObjectPrototype.h"
  27 #include "JSCInlines.h"
  28 #include <time.h>
  29 #include <wtf/Assertions.h>
  30 #include <wtf/MathExtras.h>
  31 #include <wtf/RandomNumber.h>
  32 #include <wtf/RandomNumberSeed.h>
  33 #include <wtf/Vector.h>
  34
  35 namespace JSC {
  36
  37 STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(MathObject);
  38
  39 EncodedJSValue JSC_HOST_CALL mathProtoFuncACos(ExecState*);
  40 EncodedJSValue JSC_HOST_CALL mathProtoFuncACosh(ExecState*);
  41 EncodedJSValue JSC_HOST_CALL mathProtoFuncASin(ExecState*);
  42 EncodedJSValue JSC_HOST_CALL mathProtoFuncASinh(ExecState*);
  43 EncodedJSValue JSC_HOST_CALL mathProtoFuncATan(ExecState*);
  44 EncodedJSValue JSC_HOST_CALL mathProtoFuncATanh(ExecState*);
  45 EncodedJSValue JSC_HOST_CALL mathProtoFuncATan2(ExecState*);
  46 EncodedJSValue JSC_HOST_CALL mathProtoFuncCbrt(ExecState*);
  47 EncodedJSValue JSC_HOST_CALL mathProtoFuncCeil(ExecState*);
  48 EncodedJSValue JSC_HOST_CALL mathProtoFuncClz32(ExecState*);
  49 EncodedJSValue JSC_HOST_CALL mathProtoFuncCos(ExecState*);
  50 EncodedJSValue JSC_HOST_CALL mathProtoFuncCosh(ExecState*);
  51 EncodedJSValue JSC_HOST_CALL mathProtoFuncExp(ExecState*);
  52 EncodedJSValue JSC_HOST_CALL mathProtoFuncExpm1(ExecState*);
  53 EncodedJSValue JSC_HOST_CALL mathProtoFuncFround(ExecState*);
  54 EncodedJSValue JSC_HOST_CALL mathProtoFuncHypot(ExecState*);
  55 EncodedJSValue JSC_HOST_CALL mathProtoFuncLog(ExecState*);
  56 EncodedJSValue JSC_HOST_CALL mathProtoFuncLog1p(ExecState*);
  57 EncodedJSValue JSC_HOST_CALL mathProtoFuncLog10(ExecState*);
  58 EncodedJSValue JSC_HOST_CALL mathProtoFuncLog2(ExecState*);
  59 EncodedJSValue JSC_HOST_CALL mathProtoFuncMax(ExecState*);
  60 EncodedJSValue JSC_HOST_CALL mathProtoFuncMin(ExecState*);
  61 EncodedJSValue JSC_HOST_CALL mathProtoFuncPow(ExecState*);
  62 EncodedJSValue JSC_HOST_CALL mathProtoFuncRandom(ExecState*);
  63 EncodedJSValue JSC_HOST_CALL mathProtoFuncRound(ExecState*);
  64 EncodedJSValue JSC_HOST_CALL mathProtoFuncSign(ExecState*);
  65 EncodedJSValue JSC_HOST_CALL mathProtoFuncSin(ExecState*);
  66 EncodedJSValue JSC_HOST_CALL mathProtoFuncSinh(ExecState*);
  67 EncodedJSValue JSC_HOST_CALL mathProtoFuncSqrt(ExecState*);
  68 EncodedJSValue JSC_HOST_CALL mathProtoFuncTan(ExecState*);
  69 EncodedJSValue JSC_HOST_CALL mathProtoFuncTanh(ExecState*);
  70 EncodedJSValue JSC_HOST_CALL mathProtoFuncTrunc(ExecState*);
  71 EncodedJSValue JSC_HOST_CALL mathProtoFuncIMul(ExecState*);
  72
  73 }
  74
  75 namespace JSC {
  76
  77 const ClassInfo MathObject::s_info = { "Math", &Base::s_info, 0, CREATE_METHOD_TABLE(MathObject) };
  78
  79 MathObject::MathObject(VM& vm, Structure* structure)
  80     : JSNonFinalObject(vm, structure)
  81 {
  82 }
  83
  84 void MathObject::finishCreation(VM& vm, JSGlobalObject* globalObject)
  85 {
  86     Base::finishCreation(vm);
  87     ASSERT(inherits(info()));
  88
  89     putDirectWithoutTransition(vm, Identifier::fromString(&vm, "E"), jsNumber(exp(1.0)), DontDelete | DontEnum | ReadOnly);
  90     putDirectWithoutTransition(vm, Identifier::fromString(&vm, "LN2"), jsNumber(log(2.0)), DontDelete | DontEnum | ReadOnly);
  91     putDirectWithoutTransition(vm, Identifier::fromString(&vm, "LN10"), jsNumber(log(10.0)), DontDelete | DontEnum | ReadOnly);
  92     putDirectWithoutTransition(vm, Identifier::fromString(&vm, "LOG2E"), jsNumber(1.0 / log(2.0)), DontDelete | DontEnum | ReadOnly);
  93     putDirectWithoutTransition(vm, Identifier::fromString(&vm, "LOG10E"), jsNumber(0.4342944819032518), DontDelete | DontEnum | ReadOnly);
  94     putDirectWithoutTransition(vm, Identifier::fromString(&vm, "PI"), jsNumber(piDouble), DontDelete | DontEnum | ReadOnly);
  95     putDirectWithoutTransition(vm, Identifier::fromString(&vm, "SQRT1_2"), jsNumber(sqrt(0.5)), DontDelete | DontEnum | ReadOnly);
  96     putDirectWithoutTransition(vm, Identifier::fromString(&vm, "SQRT2"), jsNumber(sqrt(2.0)), DontDelete | DontEnum | ReadOnly);
  97
  98     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "abs"), 1, mathProtoFuncAbs, AbsIntrinsic, DontEnum | Function);
  99     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "acos"), 1, mathProtoFuncACos, NoIntrinsic, DontEnum | Function);
 100     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "asin"), 1, mathProtoFuncASin, NoIntrinsic, DontEnum | Function);
 101     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "atan"), 1, mathProtoFuncATan, NoIntrinsic, DontEnum | Function);
 102     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "acosh"), 1, mathProtoFuncACosh, NoIntrinsic, DontEnum | Function);
 103     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "asinh"), 1, mathProtoFuncASinh, NoIntrinsic, DontEnum | Function);
 104     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "atanh"), 1, mathProtoFuncATanh, NoIntrinsic, DontEnum | Function);
 105     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "atan2"), 2, mathProtoFuncATan2, NoIntrinsic, DontEnum | Function);
 106     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "cbrt"), 1, mathProtoFuncCbrt, NoIntrinsic, DontEnum | Function);
 107     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "ceil"), 1, mathProtoFuncCeil, CeilIntrinsic, DontEnum | Function);
 108     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "clz32"), 1, mathProtoFuncClz32, Clz32Intrinsic, DontEnum | Function);
 109     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "cos"), 1, mathProtoFuncCos, CosIntrinsic, DontEnum | Function);
 110     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "cosh"), 1, mathProtoFuncCosh, NoIntrinsic, DontEnum | Function);
 111     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "exp"), 1, mathProtoFuncExp, ExpIntrinsic, DontEnum | Function);
 112     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "expm1"), 1, mathProtoFuncExpm1, NoIntrinsic, DontEnum | Function);
 113     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "floor"), 1, mathProtoFuncFloor, FloorIntrinsic, DontEnum | Function);
 114     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "fround"), 1, mathProtoFuncFround, FRoundIntrinsic, DontEnum | Function);
 115     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "hypot"), 2, mathProtoFuncHypot, NoIntrinsic, DontEnum | Function);
 116     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "log"), 1, mathProtoFuncLog, LogIntrinsic, DontEnum | Function);
 117     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "log10"), 1, mathProtoFuncLog10, NoIntrinsic, DontEnum | Function);
 118     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "log1p"), 1, mathProtoFuncLog1p, NoIntrinsic, DontEnum | Function);
 119     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "log2"), 1, mathProtoFuncLog2, NoIntrinsic, DontEnum | Function);
 120     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "max"), 2, mathProtoFuncMax, MaxIntrinsic, DontEnum | Function);
 121     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "min"), 2, mathProtoFuncMin, MinIntrinsic, DontEnum | Function);
 122     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "pow"), 2, mathProtoFuncPow, PowIntrinsic, DontEnum | Function);
 123     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "random"), 0, mathProtoFuncRandom, NoIntrinsic, DontEnum | Function);
 124     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "round"), 1, mathProtoFuncRound, RoundIntrinsic, DontEnum | Function);
 125     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "sign"), 1, mathProtoFuncSign, NoIntrinsic, DontEnum | Function);
 126     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "sin"), 1, mathProtoFuncSin, SinIntrinsic, DontEnum | Function);
 127     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "sinh"), 1, mathProtoFuncSinh, NoIntrinsic, DontEnum | Function);
 128     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "sqrt"), 1, mathProtoFuncSqrt, SqrtIntrinsic, DontEnum | Function);
 129     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "tan"), 1, mathProtoFuncTan, NoIntrinsic, DontEnum | Function);
 130     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "tanh"), 1, mathProtoFuncTanh, NoIntrinsic, DontEnum | Function);
 131     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "trunc"), 1, mathProtoFuncTrunc, NoIntrinsic, DontEnum | Function);
 132     putDirectNativeFunctionWithoutTransition(vm, globalObject, Identifier::fromString(&vm, "imul"), 2, mathProtoFuncIMul, IMulIntrinsic, DontEnum | Function);
 133 }
 134
 135 // ------------------------------ Functions --------------------------------
 136
 137 EncodedJSValue JSC_HOST_CALL mathProtoFuncAbs(ExecState* exec)
 138 {
 139     return JSValue::encode(jsNumber(fabs(exec->argument(0).toNumber(exec))));
 140 }
 141
 142 EncodedJSValue JSC_HOST_CALL mathProtoFuncACos(ExecState* exec)
 143 {
 144     return JSValue::encode(jsDoubleNumber(acos(exec->argument(0).toNumber(exec))));
 145 }
 146
 147 EncodedJSValue JSC_HOST_CALL mathProtoFuncASin(ExecState* exec)
 148 {
 149     return JSValue::encode(jsDoubleNumber(asin(exec->argument(0).toNumber(exec))));
 150 }
 151
 152 EncodedJSValue JSC_HOST_CALL mathProtoFuncATan(ExecState* exec)
 153 {
 154     return JSValue::encode(jsDoubleNumber(atan(exec->argument(0).toNumber(exec))));
 155 }
 156
 157 EncodedJSValue JSC_HOST_CALL mathProtoFuncATan2(ExecState* exec)
 158 {
 159     double arg0 = exec->argument(0).toNumber(exec);
 160     double arg1 = exec->argument(1).toNumber(exec);
 161     return JSValue::encode(jsDoubleNumber(atan2(arg0, arg1)));
 162 }
 163
 164 EncodedJSValue JSC_HOST_CALL mathProtoFuncCeil(ExecState* exec)
 165 {
 166     return JSValue::encode(jsNumber(ceil(exec->argument(0).toNumber(exec))));
 167 }
 168
 169 EncodedJSValue JSC_HOST_CALL mathProtoFuncClz32(ExecState* exec)
 170 {
 171     uint32_t value = exec->argument(0).toUInt32(exec);
 172     if (exec->hadException())
 173         return JSValue::encode(jsNull());
 174     return JSValue::encode(JSValue(clz32(value)));
 175 }
 176
 177 EncodedJSValue JSC_HOST_CALL mathProtoFuncCos(ExecState* exec)
 178 {
 179     return JSValue::encode(jsDoubleNumber(cos(exec->argument(0).toNumber(exec))));
 180 }
 181
 182 EncodedJSValue JSC_HOST_CALL mathProtoFuncExp(ExecState* exec)
 183 {
 184     return JSValue::encode(jsDoubleNumber(exp(exec->argument(0).toNumber(exec))));
 185 }
 186
 187 EncodedJSValue JSC_HOST_CALL mathProtoFuncFloor(ExecState* exec)
 188 {
 189     return JSValue::encode(jsNumber(floor(exec->argument(0).toNumber(exec))));
 190 }
 191
 192 EncodedJSValue JSC_HOST_CALL mathProtoFuncHypot(ExecState* exec)
 193 {
 194     unsigned argsCount = exec->argumentCount();
 195     double max = 0;
 196     Vector<double, 8> args;
 197     args.reserveInitialCapacity(argsCount);
 198     for (unsigned i = 0; i < argsCount; ++i) {
 199         args.uncheckedAppend(exec->uncheckedArgument(i).toNumber(exec));
 200         if (exec->hadException())
 201             return JSValue::encode(jsNull());
 202         if (std::isinf(args[i]))
 203             return JSValue::encode(jsDoubleNumber(+std::numeric_limits<double>::infinity()));
 204         max = std::max(fabs(args[i]), max);
 205     }
 206     if (!max)
 207         max = 1;
 208     // Kahan summation algorithm significantly reduces the numerical error in the total obtained.
 209     double sum = 0;
 210     double compensation = 0;
 211     for (double argument : args) {
 212         double scaledArgument = argument / max;
 213         double summand = scaledArgument * scaledArgument - compensation;
 214         double preliminary = sum + summand;
 215         compensation = (preliminary - sum) - summand;
 216         sum = preliminary;
 217     }
 218     return JSValue::encode(jsDoubleNumber(sqrt(sum) * max));
 219 }
 220
 221 EncodedJSValue JSC_HOST_CALL mathProtoFuncLog(ExecState* exec)
 222 {
 223     return JSValue::encode(jsDoubleNumber(log(exec->argument(0).toNumber(exec))));
 224 }
 225
 226 EncodedJSValue JSC_HOST_CALL mathProtoFuncMax(ExecState* exec)
 227 {
 228     unsigned argsCount = exec->argumentCount();
 229     double result = -std::numeric_limits<double>::infinity();
 230     for (unsigned k = 0; k < argsCount; ++k) {
 231         double val = exec->uncheckedArgument(k).toNumber(exec);
 232         if (std::isnan(val)) {
 233             result = PNaN;
 234         } else if (val > result || (!val && !result && !std::signbit(val)))
 235             result = val;
 236     }
 237     return JSValue::encode(jsNumber(result));
 238 }
 239
 240 EncodedJSValue JSC_HOST_CALL mathProtoFuncMin(ExecState* exec)
 241 {
 242     unsigned argsCount = exec->argumentCount();
 243     double result = +std::numeric_limits<double>::infinity();
 244     for (unsigned k = 0; k < argsCount; ++k) {
 245         double val = exec->uncheckedArgument(k).toNumber(exec);
 246         if (std::isnan(val)) {
 247             result = PNaN;
 248         } else if (val < result || (!val && !result && std::signbit(val)))
 249             result = val;
 250     }
 251     return JSValue::encode(jsNumber(result));
 252 }
 253
 254 EncodedJSValue JSC_HOST_CALL mathProtoFuncPow(ExecState* exec)
 255 {
 256     // ECMA 15.8.2.1.13
 257
 258     double arg = exec->argument(0).toNumber(exec);
 259     double arg2 = exec->argument(1).toNumber(exec);
 260
 261     return JSValue::encode(JSValue(operationMathPow(arg, arg2)));
 262 }
 263
 264 EncodedJSValue JSC_HOST_CALL mathProtoFuncRandom(ExecState* exec)
 265 {
 266     return JSValue::encode(jsDoubleNumber(exec->lexicalGlobalObject()->weakRandomNumber()));
 267 }
 268
 269 EncodedJSValue JSC_HOST_CALL mathProtoFuncRound(ExecState* exec)
 270 {
 271     return JSValue::encode(jsNumber(jsRound(exec->argument(0).toNumber(exec))));
 272 }
 273
 274 EncodedJSValue JSC_HOST_CALL mathProtoFuncSign(ExecState* exec)
 275 {
 276     double arg = exec->argument(0).toNumber(exec);
 277     if (std::isnan(arg))
 278         return JSValue::encode(jsNaN());
 279     if (!arg)
 280         return JSValue::encode(std::signbit(arg) ? jsNumber(-0.0) : jsNumber(0));
 281     return JSValue::encode(jsNumber(std::signbit(arg) ? -1 : 1));
 282 }
 283
 284 EncodedJSValue JSC_HOST_CALL mathProtoFuncSin(ExecState* exec)
 285 {
 286     return JSValue::encode(jsDoubleNumber(sin(exec->argument(0).toNumber(exec))));
 287 }
 288
 289 EncodedJSValue JSC_HOST_CALL mathProtoFuncSqrt(ExecState* exec)
 290 {
 291     return JSValue::encode(jsDoubleNumber(sqrt(exec->argument(0).toNumber(exec))));
 292 }
 293
 294 EncodedJSValue JSC_HOST_CALL mathProtoFuncTan(ExecState* exec)
 295 {
 296     return JSValue::encode(jsDoubleNumber(tan(exec->argument(0).toNumber(exec))));
 297 }
 298
 299 EncodedJSValue JSC_HOST_CALL mathProtoFuncIMul(ExecState* exec)
 300 {
 301     int32_t left = exec->argument(0).toInt32(exec);
 302     if (exec->hadException())
 303         return JSValue::encode(jsNull());
 304     int32_t right = exec->argument(1).toInt32(exec);
 305     return JSValue::encode(jsNumber(left * right));
 306 }
 307
 308 EncodedJSValue JSC_HOST_CALL mathProtoFuncACosh(ExecState* exec)
 309 {
 310     return JSValue::encode(jsDoubleNumber(acosh(exec->argument(0).toNumber(exec))));
 311 }
 312
 313 EncodedJSValue JSC_HOST_CALL mathProtoFuncASinh(ExecState* exec)
 314 {
 315     return JSValue::encode(jsDoubleNumber(asinh(exec->argument(0).toNumber(exec))));
 316 }
 317
 318 EncodedJSValue JSC_HOST_CALL mathProtoFuncATanh(ExecState* exec)
 319 {
 320     return JSValue::encode(jsDoubleNumber(atanh(exec->argument(0).toNumber(exec))));
 321 }
 322
 323 EncodedJSValue JSC_HOST_CALL mathProtoFuncCbrt(ExecState* exec)
 324 {
 325     return JSValue::encode(jsDoubleNumber(cbrt(exec->argument(0).toNumber(exec))));
 326 }
 327
 328 EncodedJSValue JSC_HOST_CALL mathProtoFuncCosh(ExecState* exec)
 329 {
 330     return JSValue::encode(jsDoubleNumber(cosh(exec->argument(0).toNumber(exec))));
 331 }
 332
 333 EncodedJSValue JSC_HOST_CALL mathProtoFuncExpm1(ExecState* exec)
 334 {
 335     return JSValue::encode(jsDoubleNumber(expm1(exec->argument(0).toNumber(exec))));
 336 }
 337
 338 EncodedJSValue JSC_HOST_CALL mathProtoFuncFround(ExecState* exec)
 339 {
 340     return JSValue::encode(jsDoubleNumber(static_cast<float>(exec->argument(0).toNumber(exec))));
 341 }
 342
 343 EncodedJSValue JSC_HOST_CALL mathProtoFuncLog1p(ExecState* exec)
 344 {
 345     double value = exec->argument(0).toNumber(exec);
 346     if (value == 0)
 347         return JSValue::encode(jsDoubleNumber(value));
 348     return JSValue::encode(jsDoubleNumber(log1p(value)));
 349 }
 350
 351 EncodedJSValue JSC_HOST_CALL mathProtoFuncLog10(ExecState* exec)
 352 {
 353     return JSValue::encode(jsDoubleNumber(log10(exec->argument(0).toNumber(exec))));
 354 }
 355
 356 EncodedJSValue JSC_HOST_CALL mathProtoFuncLog2(ExecState* exec)
 357 {
 358     return JSValue::encode(jsDoubleNumber(log2(exec->argument(0).toNumber(exec))));
 359 }
 360
 361 EncodedJSValue JSC_HOST_CALL mathProtoFuncSinh(ExecState* exec)
 362 {
 363     return JSValue::encode(jsDoubleNumber(sinh(exec->argument(0).toNumber(exec))));
 364 }
 365
 366 EncodedJSValue JSC_HOST_CALL mathProtoFuncTanh(ExecState* exec)
 367 {
 368     return JSValue::encode(jsDoubleNumber(tanh(exec->argument(0).toNumber(exec))));
 369 }
 370
 371 EncodedJSValue JSC_HOST_CALL mathProtoFuncTrunc(ExecState*exec)
 372 {
 373     return JSValue::encode(jsNumber(exec->argument(0).toIntegerPreserveNaN(exec)));
 374 }
 375
 376 } // namespace JSC