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 #include "JSCInlines.h"
  29
  30 namespace JSC {
  31
  32 static EncodedJSValue numberConstructorNaNValue(ExecState*, JSObject*, EncodedJSValue, PropertyName);
  33 static EncodedJSValue numberConstructorNegInfinity(ExecState*, JSObject*, EncodedJSValue, PropertyName);
  34 static EncodedJSValue numberConstructorPosInfinity(ExecState*, JSObject*, EncodedJSValue, PropertyName);
  35 static EncodedJSValue numberConstructorMaxValue(ExecState*, JSObject*, EncodedJSValue, PropertyName);
  36 static EncodedJSValue numberConstructorMinValue(ExecState*, JSObject*, EncodedJSValue, PropertyName);
  37
  38 } // namespace JSC
  39
  40 #include "NumberConstructor.lut.h"
  41
  42 namespace JSC {
  43
  44 STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(NumberConstructor);
  45
  46 const ClassInfo NumberConstructor::s_info = { "Function", &InternalFunction::s_info, 0, ExecState::numberConstructorTable, CREATE_METHOD_TABLE(NumberConstructor) };
  47
  48 /* Source for NumberConstructor.lut.h
  49 @begin numberConstructorTable
  50    NaN                   numberConstructorNaNValue       DontEnum|DontDelete|ReadOnly
  51    NEGATIVE_INFINITY     numberConstructorNegInfinity    DontEnum|DontDelete|ReadOnly
  52    POSITIVE_INFINITY     numberConstructorPosInfinity    DontEnum|DontDelete|ReadOnly
  53    MAX_VALUE             numberConstructorMaxValue       DontEnum|DontDelete|ReadOnly
  54    MIN_VALUE             numberConstructorMinValue       DontEnum|DontDelete|ReadOnly
  55 @end
  56 */
  57
  58 NumberConstructor::NumberConstructor(VM& vm, Structure* structure)
  59     : InternalFunction(vm, structure)
  60 {
  61 }
  62
  63 void NumberConstructor::finishCreation(VM& vm, NumberPrototype* numberPrototype)
  64 {
  65     Base::finishCreation(vm, NumberPrototype::info()->className);
  66     ASSERT(inherits(info()));
  67
  68     // Number.Prototype
  69     putDirectWithoutTransition(vm, vm.propertyNames->prototype, numberPrototype, DontEnum | DontDelete | ReadOnly);
  70
  71     // no. of arguments for constructor
  72     putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(1), ReadOnly | DontEnum | DontDelete);
  73 }
  74
  75 bool NumberConstructor::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
  76 {
  77     return getStaticValueSlot<NumberConstructor, InternalFunction>(exec, ExecState::numberConstructorTable(exec->vm()), jsCast<NumberConstructor*>(object), propertyName, slot);
  78 }
  79
  80 static EncodedJSValue numberConstructorNaNValue(ExecState*, JSObject*, EncodedJSValue, PropertyName)
  81 {
  82     return JSValue::encode(jsNaN());
  83 }
  84
  85 static EncodedJSValue numberConstructorNegInfinity(ExecState*, JSObject*, EncodedJSValue, PropertyName)
  86 {
  87     return JSValue::encode(jsNumber(-std::numeric_limits<double>::infinity()));
  88 }
  89
  90 static EncodedJSValue numberConstructorPosInfinity(ExecState*, JSObject*, EncodedJSValue, PropertyName)
  91 {
  92     return JSValue::encode(jsNumber(std::numeric_limits<double>::infinity()));
  93 }
  94
  95 static EncodedJSValue numberConstructorMaxValue(ExecState*, JSObject*, EncodedJSValue, PropertyName)
  96 {
  97     return JSValue::encode(jsNumber(1.7976931348623157E+308));
  98 }
  99
 100 static EncodedJSValue numberConstructorMinValue(ExecState*, JSObject*, EncodedJSValue, PropertyName)
 101 {
 102     return JSValue::encode(jsNumber(5E-324));
 103 }
 104
 105 // ECMA 15.7.1
 106 static EncodedJSValue JSC_HOST_CALL constructWithNumberConstructor(ExecState* exec)
 107 {
 108     NumberObject* object = NumberObject::create(exec->vm(), asInternalFunction(exec->callee())->globalObject()->numberObjectStructure());
 109     double n = exec->argumentCount() ? exec->uncheckedArgument(0).toNumber(exec) : 0;
 110     object->setInternalValue(exec->vm(), jsNumber(n));
 111     return JSValue::encode(object);
 112 }
 113
 114 ConstructType NumberConstructor::getConstructData(JSCell*, ConstructData& constructData)
 115 {
 116     constructData.native.function = constructWithNumberConstructor;
 117     return ConstructTypeHost;
 118 }
 119
 120 // ECMA 15.7.2
 121 static EncodedJSValue JSC_HOST_CALL callNumberConstructor(ExecState* exec)
 122 {
 123     return JSValue::encode(jsNumber(!exec->argumentCount() ? 0 : exec->uncheckedArgument(0).toNumber(exec)));
 124 }
 125
 126 CallType NumberConstructor::getCallData(JSCell*, CallData& callData)
 127 {
 128     callData.native.function = callNumberConstructor;
 129     return CallTypeHost;
 130 }
 131
 132 } // namespace JSC