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 ASSERT_HAS_TRIVIAL_DESTRUCTOR(NumberConstructor);
  46
  47 const ClassInfo NumberConstructor::s_info = { "Function", &InternalFunction::s_info, 0, ExecState::numberConstructorTable, CREATE_METHOD_TABLE(NumberConstructor) };
  48
  49 /* Source for NumberConstructor.lut.h
  50 @begin numberConstructorTable
  51    NaN                   numberConstructorNaNValue       DontEnum|DontDelete|ReadOnly
  52    NEGATIVE_INFINITY     numberConstructorNegInfinity    DontEnum|DontDelete|ReadOnly
  53    POSITIVE_INFINITY     numberConstructorPosInfinity    DontEnum|DontDelete|ReadOnly
  54    MAX_VALUE             numberConstructorMaxValue       DontEnum|DontDelete|ReadOnly
  55    MIN_VALUE             numberConstructorMinValue       DontEnum|DontDelete|ReadOnly
  56 @end
  57 */
  58
  59 NumberConstructor::NumberConstructor(JSGlobalObject* globalObject, Structure* structure)
  60     : InternalFunction(globalObject, structure)
  61 {
  62 }
  63
  64 void NumberConstructor::finishCreation(ExecState* exec, NumberPrototype* numberPrototype)
  65 {
  66     Base::finishCreation(exec->globalData(), Identifier(exec, numberPrototype->s_info.className));
  67     ASSERT(inherits(&s_info));
  68
  69     // Number.Prototype
  70     putDirectWithoutTransition(exec->globalData(), exec->propertyNames().prototype, numberPrototype, DontEnum | DontDelete | ReadOnly);
  71
  72     // no. of arguments for constructor
  73     putDirectWithoutTransition(exec->globalData(), exec->propertyNames().length, jsNumber(1), ReadOnly | DontEnum | DontDelete);
  74 }
  75
  76 bool NumberConstructor::getOwnPropertySlot(JSCell* cell, ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
  77 {
  78     return getStaticValueSlot<NumberConstructor, InternalFunction>(exec, ExecState::numberConstructorTable(exec), jsCast<NumberConstructor*>(cell), propertyName, slot);
  79 }
  80
  81 bool NumberConstructor::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
  82 {
  83     return getStaticValueDescriptor<NumberConstructor, InternalFunction>(exec, ExecState::numberConstructorTable(exec), jsCast<NumberConstructor*>(object), propertyName, descriptor);
  84 }
  85
  86 void NumberConstructor::put(JSCell* cell, ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
  87 {
  88     lookupPut<NumberConstructor, InternalFunction>(exec, propertyName, value, ExecState::numberConstructorTable(exec), jsCast<NumberConstructor*>(cell), slot);
  89 }
  90
  91 static JSValue numberConstructorNaNValue(ExecState*, JSValue, const Identifier&)
  92 {
  93     return jsNaN();
  94 }
  95
  96 static JSValue numberConstructorNegInfinity(ExecState*, JSValue, const Identifier&)
  97 {
  98     return jsNumber(-std::numeric_limits<double>::infinity());
  99 }
 100
 101 static JSValue numberConstructorPosInfinity(ExecState*, JSValue, const Identifier&)
 102 {
 103     return jsNumber(std::numeric_limits<double>::infinity());
 104 }
 105
 106 static JSValue numberConstructorMaxValue(ExecState*, JSValue, const Identifier&)
 107 {
 108     return jsNumber(1.7976931348623157E+308);
 109 }
 110
 111 static JSValue numberConstructorMinValue(ExecState*, JSValue, const Identifier&)
 112 {
 113     return jsNumber(5E-324);
 114 }
 115
 116 // ECMA 15.7.1
 117 static EncodedJSValue JSC_HOST_CALL constructWithNumberConstructor(ExecState* exec)
 118 {
 119     NumberObject* object = NumberObject::create(exec->globalData(), asInternalFunction(exec->callee())->globalObject()->numberObjectStructure());
 120     double n = exec->argumentCount() ? exec->argument(0).toNumber(exec) : 0;
 121     object->setInternalValue(exec->globalData(), jsNumber(n));
 122     return JSValue::encode(object);
 123 }
 124
 125 ConstructType NumberConstructor::getConstructData(JSCell*, ConstructData& constructData)
 126 {
 127     constructData.native.function = constructWithNumberConstructor;
 128     return ConstructTypeHost;
 129 }
 130
 131 // ECMA 15.7.2
 132 static EncodedJSValue JSC_HOST_CALL callNumberConstructor(ExecState* exec)
 133 {
 134     return JSValue::encode(jsNumber(!exec->argumentCount() ? 0 : exec->argument(0).toNumber(exec)));
 135 }
 136
 137 CallType NumberConstructor::getCallData(JSCell*, CallData& callData)
 138 {
 139     callData.native.function = callNumberConstructor;
 140     return CallTypeHost;
 141 }
 142
 143 } // namespace JSC