runtime/NumberConstructor.cpp

   1 /*
   2  *  Copyright (C) 1999-2000,2003 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2007, 2008, 2011 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
  18  *  USA
  19  *
  20  */
  21
  22 #include "config.h"
  23 #include "NumberConstructor.h"
  24
  25 #include "Lookup.h"
  26 #include "NumberObject.h"
  27 #include "NumberPrototype.h"
  28
  29 namespace JSC {
  30
  31 ASSERT_CLASS_FITS_IN_CELL(NumberConstructor);
  32
  33 static JSValue numberConstructorNaNValue(ExecState*, JSValue, const Identifier&);
  34 static JSValue numberConstructorNegInfinity(ExecState*, JSValue, const Identifier&);
  35 static JSValue numberConstructorPosInfinity(ExecState*, JSValue, const Identifier&);
  36 static JSValue numberConstructorMaxValue(ExecState*, JSValue, const Identifier&);
  37 static JSValue numberConstructorMinValue(ExecState*, JSValue, const Identifier&);
  38
  39 } // namespace JSC
  40
  41 #include "NumberConstructor.lut.h"
  42
  43 namespace JSC {
  44
  45 const ClassInfo NumberConstructor::s_info = { "Function", &InternalFunction::s_info, 0, ExecState::numberConstructorTable };
  46
  47 /* Source for NumberConstructor.lut.h
  48 @begin numberConstructorTable
  49    NaN                   numberConstructorNaNValue       DontEnum|DontDelete|ReadOnly
  50    NEGATIVE_INFINITY     numberConstructorNegInfinity    DontEnum|DontDelete|ReadOnly
  51    POSITIVE_INFINITY     numberConstructorPosInfinity    DontEnum|DontDelete|ReadOnly
  52    MAX_VALUE             numberConstructorMaxValue       DontEnum|DontDelete|ReadOnly
  53    MIN_VALUE             numberConstructorMinValue       DontEnum|DontDelete|ReadOnly
  54 @end
  55 */
  56
  57 NumberConstructor::NumberConstructor(ExecState* exec, JSGlobalObject* globalObject, Structure* structure, NumberPrototype* numberPrototype)
  58     : InternalFunction(&exec->globalData(), globalObject, structure, Identifier(exec, numberPrototype->s_info.className))
  59 {
  60     ASSERT(inherits(&s_info));
  61
  62     // Number.Prototype
  63     putDirectWithoutTransition(exec->globalData(), exec->propertyNames().prototype, numberPrototype, DontEnum | DontDelete | ReadOnly);
  64
  65     // no. of arguments for constructor
  66     putDirectWithoutTransition(exec->globalData(), exec->propertyNames().length, jsNumber(1), ReadOnly | DontEnum | DontDelete);
  67 }
  68
  69 bool NumberConstructor::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
  70 {
  71     return getStaticValueSlot<NumberConstructor, InternalFunction>(exec, ExecState::numberConstructorTable(exec), this, propertyName, slot);
  72 }
  73
  74 bool NumberConstructor::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
  75 {
  76     return getStaticValueDescriptor<NumberConstructor, InternalFunction>(exec, ExecState::numberConstructorTable(exec), this, propertyName, descriptor);
  77 }
  78
  79 static JSValue numberConstructorNaNValue(ExecState*, JSValue, const Identifier&)
  80 {
  81     return jsNaN();
  82 }
  83
  84 static JSValue numberConstructorNegInfinity(ExecState*, JSValue, const Identifier&)
  85 {
  86     return jsNumber(-Inf);
  87 }
  88
  89 static JSValue numberConstructorPosInfinity(ExecState*, JSValue, const Identifier&)
  90 {
  91     return jsNumber(Inf);
  92 }
  93
  94 static JSValue numberConstructorMaxValue(ExecState*, JSValue, const Identifier&)
  95 {
  96     return jsNumber(1.7976931348623157E+308);
  97 }
  98
  99 static JSValue numberConstructorMinValue(ExecState*, JSValue, const Identifier&)
 100 {
 101     return jsNumber(5E-324);
 102 }
 103
 104 // ECMA 15.7.1
 105 static EncodedJSValue JSC_HOST_CALL constructWithNumberConstructor(ExecState* exec)
 106 {
 107     NumberObject* object = new (exec) NumberObject(exec->globalData(), asInternalFunction(exec->callee())->globalObject()->numberObjectStructure());
 108     double n = exec->argumentCount() ? exec->argument(0).toNumber(exec) : 0;
 109     object->setInternalValue(exec->globalData(), jsNumber(n));
 110     return JSValue::encode(object);
 111 }
 112
 113 ConstructType NumberConstructor::getConstructData(ConstructData& constructData)
 114 {
 115     constructData.native.function = constructWithNumberConstructor;
 116     return ConstructTypeHost;
 117 }
 118
 119 // ECMA 15.7.2
 120 static EncodedJSValue JSC_HOST_CALL callNumberConstructor(ExecState* exec)
 121 {
 122     return JSValue::encode(jsNumber(!exec->argumentCount() ? 0 : exec->argument(0).toNumber(exec)));
 123 }
 124
 125 CallType NumberConstructor::getCallData(CallData& callData)
 126 {
 127     callData.native.function = callNumberConstructor;
 128     return CallTypeHost;
 129 }
 130
 131 } // namespace JSC