1 /* 2 * Copyright (C) 2008, 2009 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef JSNotAnObject_h 30 #define JSNotAnObject_h 31 32 #include "JSObject.h" 33 34 namespace JSC { 35 36 // This unholy class is used to allow us to avoid multiple exception checks 37 // in certain SquirrelFish bytecodes -- effectively it just silently consumes 38 // any operations performed on the result of a failed toObject call. 39 class JSNotAnObject : public JSNonFinalObject { 40 public: JSNotAnObject(ExecState * exec)41 JSNotAnObject(ExecState* exec) 42 : JSNonFinalObject(exec->globalData(), exec->globalData().notAnObjectStructure.get()) 43 { 44 } 45 createStructure(JSGlobalData & globalData,JSValue prototype)46 static Structure* createStructure(JSGlobalData& globalData, JSValue prototype) 47 { 48 return Structure::create(globalData, prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount, &s_info); 49 } 50 51 private: 52 53 static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesGetPropertyNames | JSObject::StructureFlags; 54 55 // JSValue methods 56 virtual JSValue toPrimitive(ExecState*, PreferredPrimitiveType) const; 57 virtual bool getPrimitiveNumber(ExecState*, double& number, JSValue&); 58 virtual bool toBoolean(ExecState*) const; 59 virtual double toNumber(ExecState*) const; 60 virtual UString toString(ExecState*) const; 61 virtual JSObject* toObject(ExecState*, JSGlobalObject*) const; 62 63 // JSObject methods 64 virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&); 65 virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&); 66 virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&); 67 68 virtual void put(ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&); 69 virtual void put(ExecState*, unsigned propertyName, JSValue); 70 71 virtual bool deleteProperty(ExecState*, const Identifier& propertyName); 72 virtual bool deleteProperty(ExecState*, unsigned propertyName); 73 74 virtual void getOwnPropertyNames(ExecState*, PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties); 75 }; 76 77 } // namespace JSC 78 79 #endif // JSNotAnObject_h 80