runtime/ArrayConstructor.cpp

   1 /*
   2  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2003, 2007, 2008, 2011 Apple Inc. All rights reserved.
   4  *  Copyright (C) 2003 Peter Kelly (pmk@post.com)
   5  *  Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
   6  *
   7  *  This library is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU Lesser General Public
   9  *  License as published by the Free Software Foundation; either
  10  *  version 2 of the License, or (at your option) any later version.
  11  *
  12  *  This library is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  Lesser General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Lesser General Public
  18  *  License along with this library; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
  20  *  USA
  21  *
  22  */
  23
  24 #include "config.h"
  25 #include "ArrayConstructor.h"
  26
  27 #include "ArrayPrototype.h"
  28 #include "Error.h"
  29 #include "ExceptionHelpers.h"
  30 #include "JSArray.h"
  31 #include "JSFunction.h"
  32 #include "Lookup.h"
  33
  34 namespace JSC {
  35
  36 static EncodedJSValue JSC_HOST_CALL arrayConstructorIsArray(ExecState*);
  37
  38 }
  39
  40 #include "ArrayConstructor.lut.h"
  41
  42 namespace JSC {
  43
  44 ASSERT_HAS_TRIVIAL_DESTRUCTOR(ArrayConstructor);
  45
  46 const ClassInfo ArrayConstructor::s_info = { "Function", &InternalFunction::s_info, 0, ExecState::arrayConstructorTable, CREATE_METHOD_TABLE(ArrayConstructor) };
  47
  48 /* Source for ArrayConstructor.lut.h
  49 @begin arrayConstructorTable
  50   isArray   arrayConstructorIsArray     DontEnum|Function 1
  51 @end
  52 */
  53
  54 ASSERT_CLASS_FITS_IN_CELL(ArrayConstructor);
  55
  56 ArrayConstructor::ArrayConstructor(JSGlobalObject* globalObject, Structure* structure)
  57     : InternalFunction(globalObject, structure)
  58 {
  59 }
  60
  61 void ArrayConstructor::finishCreation(ExecState* exec, ArrayPrototype* arrayPrototype)
  62 {
  63     Base::finishCreation(exec->globalData(), Identifier(exec, arrayPrototype->classInfo()->className));
  64     putDirectWithoutTransition(exec->globalData(), exec->propertyNames().prototype, arrayPrototype, DontEnum | DontDelete | ReadOnly);
  65     putDirectWithoutTransition(exec->globalData(), exec->propertyNames().length, jsNumber(1), ReadOnly | DontEnum | DontDelete);
  66 }
  67
  68 bool ArrayConstructor::getOwnPropertySlot(JSCell* cell, ExecState* exec, const Identifier& propertyName, PropertySlot &slot)
  69 {
  70     return getStaticFunctionSlot<InternalFunction>(exec, ExecState::arrayConstructorTable(exec), jsCast<ArrayConstructor*>(cell), propertyName, slot);
  71 }
  72
  73 bool ArrayConstructor::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
  74 {
  75     return getStaticFunctionDescriptor<InternalFunction>(exec, ExecState::arrayConstructorTable(exec), jsCast<ArrayConstructor*>(object), propertyName, descriptor);
  76 }
  77
  78 // ------------------------------ Functions ---------------------------
  79
  80 static inline JSObject* constructArrayWithSizeQuirk(ExecState* exec, const ArgList& args)
  81 {
  82     JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject();
  83
  84     // a single numeric argument denotes the array size (!)
  85     if (args.size() == 1 && args.at(0).isNumber()) {
  86         uint32_t n = args.at(0).toUInt32(exec);
  87         if (n != args.at(0).toNumber(exec))
  88             return throwError(exec, createRangeError(exec, "Array size is not a small enough positive integer."));
  89         return constructEmptyArray(exec, globalObject, n);
  90     }
  91
  92     // otherwise the array is constructed with the arguments in it
  93     return constructArray(exec, globalObject, args);
  94 }
  95
  96 static EncodedJSValue JSC_HOST_CALL constructWithArrayConstructor(ExecState* exec)
  97 {
  98     ArgList args(exec);
  99     return JSValue::encode(constructArrayWithSizeQuirk(exec, args));
 100 }
 101
 102 ConstructType ArrayConstructor::getConstructData(JSCell*, ConstructData& constructData)
 103 {
 104     constructData.native.function = constructWithArrayConstructor;
 105     return ConstructTypeHost;
 106 }
 107
 108 static EncodedJSValue JSC_HOST_CALL callArrayConstructor(ExecState* exec)
 109 {
 110     ArgList args(exec);
 111     return JSValue::encode(constructArrayWithSizeQuirk(exec, args));
 112 }
 113
 114 CallType ArrayConstructor::getCallData(JSCell*, CallData& callData)
 115 {
 116     // equivalent to 'new Array(....)'
 117     callData.native.function = callArrayConstructor;
 118     return CallTypeHost;
 119 }
 120
 121 EncodedJSValue JSC_HOST_CALL arrayConstructorIsArray(ExecState* exec)
 122 {
 123     return JSValue::encode(jsBoolean(exec->argument(0).inherits(&JSArray::s_info)));
 124 }
 125
 126 } // namespace JSC