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 class JSNotAnObjectErrorStub : public JSObject { 37 public: JSNotAnObjectErrorStub(ExecState * exec,bool isNull)38 JSNotAnObjectErrorStub(ExecState* exec, bool isNull) 39 : JSObject(exec->globalData().notAnObjectErrorStubStructure) 40 , m_isNull(isNull) 41 { 42 } 43 isNull()44 bool isNull() const { return m_isNull; } 45 46 private: isNotAnObjectErrorStub()47 virtual bool isNotAnObjectErrorStub() const { return true; } 48 49 bool m_isNull; 50 }; 51 52 // This unholy class is used to allow us to avoid multiple exception checks 53 // in certain SquirrelFish bytecodes -- effectively it just silently consumes 54 // any operations performed on the result of a failed toObject call. 55 class JSNotAnObject : public JSObject { 56 public: JSNotAnObject(ExecState * exec,JSNotAnObjectErrorStub * exception)57 JSNotAnObject(ExecState* exec, JSNotAnObjectErrorStub* exception) 58 : JSObject(exec->globalData().notAnObjectStructure) 59 , m_exception(exception) 60 { 61 } 62 createStructure(JSValue prototype)63 static PassRefPtr<Structure> createStructure(JSValue prototype) 64 { 65 return Structure::create(prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount); 66 } 67 68 private: 69 70 static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesMarkChildren | OverridesGetPropertyNames | JSObject::StructureFlags; 71 72 // JSValue methods 73 virtual JSValue toPrimitive(ExecState*, PreferredPrimitiveType) const; 74 virtual bool getPrimitiveNumber(ExecState*, double& number, JSValue&); 75 virtual bool toBoolean(ExecState*) const; 76 virtual double toNumber(ExecState*) const; 77 virtual UString toString(ExecState*) const; 78 virtual JSObject* toObject(ExecState*) const; 79 80 // Marking 81 virtual void markChildren(MarkStack&); 82 83 // JSObject methods 84 virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&); 85 virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&); 86 virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&); 87 88 virtual void put(ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&); 89 virtual void put(ExecState*, unsigned propertyName, JSValue); 90 91 virtual bool deleteProperty(ExecState*, const Identifier& propertyName); 92 virtual bool deleteProperty(ExecState*, unsigned propertyName); 93 94 virtual void getOwnPropertyNames(ExecState*, PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties); 95 96 JSNotAnObjectErrorStub* m_exception; 97 }; 98 99 } // namespace JSC 100 101 #endif // JSNotAnObject_h 102