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 "Error.h"
  29 #include "JSArray.h"
  30 #include "JSFunction.h"
  31 #include "Lookup.h"
  32 #include "PrototypeFunction.h"
  33
  34 namespace JSC {
  35
  36 ASSERT_CLASS_FITS_IN_CELL(ArrayConstructor);
  37
  38 static JSValue JSC_HOST_CALL arrayConstructorIsArray(ExecState*, JSObject*, JSValue, const ArgList&);
  39
  40 ArrayConstructor::ArrayConstructor(ExecState* exec, NonNullPassRefPtr<Structure> structure, ArrayPrototype* arrayPrototype, Structure* prototypeFunctionStructure)
  41     : InternalFunction(&exec->globalData(), structure, Identifier(exec, arrayPrototype->classInfo()->className))
  42 {
  43     // ECMA 15.4.3.1 Array.prototype
  44     putDirectWithoutTransition(exec->propertyNames().prototype, arrayPrototype, DontEnum | DontDelete | ReadOnly);
  45
  46     // no. of arguments for constructor
  47     putDirectWithoutTransition(exec->propertyNames().length, jsNumber(exec, 1), ReadOnly | DontEnum | DontDelete);
  48
  49     // ES5
  50     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, prototypeFunctionStructure, 1, exec->propertyNames().isArray, arrayConstructorIsArray), DontEnum);
  51 }
  52
  53 static inline JSObject* constructArrayWithSizeQuirk(ExecState* exec, const ArgList& args)
  54 {
  55     // a single numeric argument denotes the array size (!)
  56     if (args.size() == 1 && args.at(0).isNumber()) {
  57         uint32_t n = args.at(0).toUInt32(exec);
  58         if (n != args.at(0).toNumber(exec))
  59             return throwError(exec, RangeError, "Array size is not a small enough positive integer.");
  60         return new (exec) JSArray(exec->lexicalGlobalObject()->arrayStructure(), n);
  61     }
  62
  63     // otherwise the array is constructed with the arguments in it
  64     return new (exec) JSArray(exec->lexicalGlobalObject()->arrayStructure(), args);
  65 }
  66
  67 static JSObject* constructWithArrayConstructor(ExecState* exec, JSObject*, const ArgList& args)
  68 {
  69     return constructArrayWithSizeQuirk(exec, args);
  70 }
  71
  72 // ECMA 15.4.2
  73 ConstructType ArrayConstructor::getConstructData(ConstructData& constructData)
  74 {
  75     constructData.native.function = constructWithArrayConstructor;
  76     return ConstructTypeHost;
  77 }
  78
  79 static JSValue JSC_HOST_CALL callArrayConstructor(ExecState* exec, JSObject*, JSValue, const ArgList& args)
  80 {
  81     return constructArrayWithSizeQuirk(exec, args);
  82 }
  83
  84 // ECMA 15.6.1
  85 CallType ArrayConstructor::getCallData(CallData& callData)
  86 {
  87     // equivalent to 'new Array(....)'
  88     callData.native.function = callArrayConstructor;
  89     return CallTypeHost;
  90 }
  91
  92 JSValue JSC_HOST_CALL arrayConstructorIsArray(ExecState*, JSObject*, JSValue, const ArgList& args)
  93 {
  94     return jsBoolean(args.at(0).inherits(&JSArray::info));
  95 }
  96
  97 } // namespace JSC