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 const ClassInfo ArrayConstructor::s_info = { "Function", &InternalFunction::s_info, 0, ExecState::arrayConstructorTable };
  45
  46 /* Source for ArrayConstructor.lut.h
  47 @begin arrayConstructorTable
  48   isArray   arrayConstructorIsArray     DontEnum|Function 1
  49 @end
  50 */
  51
  52 ASSERT_CLASS_FITS_IN_CELL(ArrayConstructor);
  53
  54 ArrayConstructor::ArrayConstructor(ExecState* exec, JSGlobalObject* globalObject, Structure* structure, ArrayPrototype* arrayPrototype)
  55     : InternalFunction(&exec->globalData(), globalObject, structure, Identifier(exec, arrayPrototype->classInfo()->className))
  56 {
  57     putDirectWithoutTransition(exec->globalData(), exec->propertyNames().prototype, arrayPrototype, DontEnum | DontDelete | ReadOnly);
  58     putDirectWithoutTransition(exec->globalData(), exec->propertyNames().length, jsNumber(1), ReadOnly | DontEnum | DontDelete);
  59 }
  60
  61 bool ArrayConstructor::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot &slot)
  62 {
  63     return getStaticFunctionSlot<InternalFunction>(exec, ExecState::arrayConstructorTable(exec), this, propertyName, slot);
  64 }
  65
  66 bool ArrayConstructor::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
  67 {
  68     return getStaticFunctionDescriptor<InternalFunction>(exec, ExecState::arrayConstructorTable(exec), this, propertyName, descriptor);
  69 }
  70
  71 // ------------------------------ Functions ---------------------------
  72
  73 static inline JSObject* constructArrayWithSizeQuirk(ExecState* exec, const ArgList& args)
  74 {
  75     JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject();
  76
  77     // a single numeric argument denotes the array size (!)
  78     if (args.size() == 1 && args.at(0).isNumber()) {
  79         uint32_t n = args.at(0).toUInt32(exec);
  80         if (n != args.at(0).toNumber(exec))
  81             return throwError(exec, createRangeError(exec, "Array size is not a small enough positive integer."));
  82         return new (exec) JSArray(exec->globalData(), globalObject->arrayStructure(), n, CreateInitialized);
  83     }
  84
  85     // otherwise the array is constructed with the arguments in it
  86     return new (exec) JSArray(exec->globalData(), globalObject->arrayStructure(), args);
  87 }
  88
  89 static EncodedJSValue JSC_HOST_CALL constructWithArrayConstructor(ExecState* exec)
  90 {
  91     ArgList args(exec);
  92     return JSValue::encode(constructArrayWithSizeQuirk(exec, args));
  93 }
  94
  95 ConstructType ArrayConstructor::getConstructData(ConstructData& constructData)
  96 {
  97     constructData.native.function = constructWithArrayConstructor;
  98     return ConstructTypeHost;
  99 }
 100
 101 static EncodedJSValue JSC_HOST_CALL callArrayConstructor(ExecState* exec)
 102 {
 103     ArgList args(exec);
 104     return JSValue::encode(constructArrayWithSizeQuirk(exec, args));
 105 }
 106
 107 CallType ArrayConstructor::getCallData(CallData& callData)
 108 {
 109     // equivalent to 'new Array(....)'
 110     callData.native.function = callArrayConstructor;
 111     return CallTypeHost;
 112 }
 113
 114 EncodedJSValue JSC_HOST_CALL arrayConstructorIsArray(ExecState* exec)
 115 {
 116     return JSValue::encode(jsBoolean(exec->argument(0).inherits(&JSArray::s_info)));
 117 }
 118
 119 } // namespace JSC