1 /* 2 * Copyright (C) 1999-2000 Harri Porten (porten (at) kde.org) 3 * Copyright (C) 2003, 2007, 2008 Apple Inc. All rights reserved. 4 * Copyright (C) 2003 Peter Kelly (pmk (at) post.com) 5 * Copyright (C) 2006 Alexey Proskuryakov (ap (at) 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 ASSERT_CLASS_FITS_IN_CELL(ArrayConstructor); 37 38 static EncodedJSValue JSC_HOST_CALL arrayConstructorIsArray(ExecState*); 39 40 ArrayConstructor::ArrayConstructor(ExecState* exec, JSGlobalObject* globalObject, Structure* structure, ArrayPrototype* arrayPrototype, Structure* functionStructure) 41 : InternalFunction(&exec->globalData(), globalObject, structure, Identifier(exec, arrayPrototype->classInfo()->className)) 42 { 43 // ECMA 15.4.3.1 Array.prototype 44 putDirectWithoutTransition(exec->globalData(), exec->propertyNames().prototype, arrayPrototype, DontEnum | DontDelete | ReadOnly); 45 46 // no. of arguments for constructor 47 putDirectWithoutTransition(exec->globalData(), exec->propertyNames().length, jsNumber(1), ReadOnly | DontEnum | DontDelete); 48 49 // ES5 50 putDirectFunctionWithoutTransition(exec, new (exec) JSFunction(exec, globalObject, functionStructure, 1, exec->propertyNames().isArray, arrayConstructorIsArray), DontEnum); 51 } 52 53 static inline JSObject* constructArrayWithSizeQuirk(ExecState* exec, const ArgList& args) 54 { 55 JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject(); 56 57 // a single numeric argument denotes the array size (!) 58 if (args.size() == 1 && args.at(0).isNumber()) { 59 uint32_t n = args.at(0).toUInt32(exec); 60 if (n != args.at(0).toNumber(exec)) 61 return throwError(exec, createRangeError(exec, "Array size is not a small enough positive integer.")); 62 return new (exec) JSArray(exec->globalData(), globalObject->arrayStructure(), n, CreateInitialized); 63 } 64 65 // otherwise the array is constructed with the arguments in it 66 return new (exec) JSArray(exec->globalData(), globalObject->arrayStructure(), args); 67 } 68 69 static EncodedJSValue JSC_HOST_CALL constructWithArrayConstructor(ExecState* exec) 70 { 71 ArgList args(exec); 72 return JSValue::encode(constructArrayWithSizeQuirk(exec, args)); 73 } 74 75 // ECMA 15.4.2 76 ConstructType ArrayConstructor::getConstructData(ConstructData& constructData) 77 { 78 constructData.native.function = constructWithArrayConstructor; 79 return ConstructTypeHost; 80 } 81 82 static EncodedJSValue JSC_HOST_CALL callArrayConstructor(ExecState* exec) 83 { 84 ArgList args(exec); 85 return JSValue::encode(constructArrayWithSizeQuirk(exec, args)); 86 } 87 88 // ECMA 15.6.1 89 CallType ArrayConstructor::getCallData(CallData& callData) 90 { 91 // equivalent to 'new Array(....)' 92 callData.native.function = callArrayConstructor; 93 return CallTypeHost; 94 } 95 96 EncodedJSValue JSC_HOST_CALL arrayConstructorIsArray(ExecState* exec) 97 { 98 return JSValue::encode(jsBoolean(exec->argument(0).inherits(&JSArray::s_info))); 99 } 100 101 } // namespace JSC 102
