runtime/ObjectConstructor.cpp

   1 /*
   2  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2008 Apple Inc. All rights reserved.
   4  *
   5  *  This library is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU Lesser General Public
   7  *  License as published by the Free Software Foundation; either
   8  *  version 2 of the License, or (at your option) any later version.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public
  16  *  License along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18  *
  19  */
  20
  21 #include "config.h"
  22 #include "ObjectConstructor.h"
  23
  24 #include "JSFunction.h"
  25 #include "JSGlobalObject.h"
  26 #include "ObjectPrototype.h"
  27
  28 namespace JSC {
  29
  30 ASSERT_CLASS_FITS_IN_CELL(ObjectConstructor);
  31
  32 ObjectConstructor::ObjectConstructor(ExecState* exec, PassRefPtr<Structure> structure, ObjectPrototype* objectPrototype)
  33     : InternalFunction(&exec->globalData(), structure, Identifier(exec, "Object"))
  34 {
  35     // ECMA 15.2.3.1
  36     putDirectWithoutTransition(exec->propertyNames().prototype, objectPrototype, DontEnum | DontDelete | ReadOnly);
  37
  38     // no. of arguments for constructor
  39     putDirectWithoutTransition(exec->propertyNames().length, jsNumber(exec, 1), ReadOnly | DontEnum | DontDelete);
  40 }
  41
  42 // ECMA 15.2.2
  43 static ALWAYS_INLINE JSObject* constructObject(ExecState* exec, const ArgList& args)
  44 {
  45     JSValue arg = args.at(0);
  46     if (arg.isUndefinedOrNull())
  47         return new (exec) JSObject(exec->lexicalGlobalObject()->emptyObjectStructure());
  48     return arg.toObject(exec);
  49 }
  50
  51 static JSObject* constructWithObjectConstructor(ExecState* exec, JSObject*, const ArgList& args)
  52 {
  53     return constructObject(exec, args);
  54 }
  55
  56 ConstructType ObjectConstructor::getConstructData(ConstructData& constructData)
  57 {
  58     constructData.native.function = constructWithObjectConstructor;
  59     return ConstructTypeHost;
  60 }
  61
  62 static JSValue JSC_HOST_CALL callObjectConstructor(ExecState* exec, JSObject*, JSValue, const ArgList& args)
  63 {
  64     return constructObject(exec, args);
  65 }
  66
  67 CallType ObjectConstructor::getCallData(CallData& callData)
  68 {
  69     callData.native.function = callObjectConstructor;
  70     return CallTypeHost;
  71 }
  72
  73 } // namespace JSC