runtime/ArrayConstructor.cpp

   1 /*
   2  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2003, 2007, 2008 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 "JSArray.h"
  29 #include "JSFunction.h"
  30 #include "Lookup.h"
  31
  32 namespace JSC {
  33
  34 ASSERT_CLASS_FITS_IN_CELL(ArrayConstructor);
  35
  36 ArrayConstructor::ArrayConstructor(ExecState* exec, PassRefPtr<Structure> structure, ArrayPrototype* arrayPrototype)
  37     : InternalFunction(&exec->globalData(), structure, Identifier(exec, arrayPrototype->classInfo()->className))
  38 {
  39     // ECMA 15.4.3.1 Array.prototype
  40     putDirectWithoutTransition(exec->propertyNames().prototype, arrayPrototype, DontEnum | DontDelete | ReadOnly);
  41
  42     // no. of arguments for constructor
  43     putDirectWithoutTransition(exec->propertyNames().length, jsNumber(exec, 1), ReadOnly | DontEnum | DontDelete);
  44 }
  45
  46 static JSObject* constructArrayWithSizeQuirk(ExecState* exec, const ArgList& args)
  47 {
  48     // a single numeric argument denotes the array size (!)
  49     if (args.size() == 1 && args.at(0).isNumber()) {
  50         uint32_t n = args.at(0).toUInt32(exec);
  51         if (n != args.at(0).toNumber(exec))
  52             return throwError(exec, RangeError, "Array size is not a small enough positive integer.");
  53         return new (exec) JSArray(exec->lexicalGlobalObject()->arrayStructure(), n);
  54     }
  55
  56     // otherwise the array is constructed with the arguments in it
  57     return new (exec) JSArray(exec->lexicalGlobalObject()->arrayStructure(), args);
  58 }
  59
  60 static JSObject* constructWithArrayConstructor(ExecState* exec, JSObject*, const ArgList& args)
  61 {
  62     return constructArrayWithSizeQuirk(exec, args);
  63 }
  64
  65 // ECMA 15.4.2
  66 ConstructType ArrayConstructor::getConstructData(ConstructData& constructData)
  67 {
  68     constructData.native.function = constructWithArrayConstructor;
  69     return ConstructTypeHost;
  70 }
  71
  72 static JSValue JSC_HOST_CALL callArrayConstructor(ExecState* exec, JSObject*, JSValue, const ArgList& args)
  73 {
  74     return constructArrayWithSizeQuirk(exec, args);
  75 }
  76
  77 // ECMA 15.6.1
  78 CallType ArrayConstructor::getCallData(CallData& callData)
  79 {
  80     // equivalent to 'new Array(....)'
  81     callData.native.function = callArrayConstructor;
  82     return CallTypeHost;
  83 }
  84
  85 } // namespace JSC