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
34namespace JSC {
35
36 class JSNotAnObjectErrorStub : public JSObject {
37 public:
38 JSNotAnObjectErrorStub(ExecState* exec, bool isNull)
39 : JSObject(exec->globalData().notAnObjectErrorStubStructure)
40 , m_isNull(isNull)
41 {
42 }
43
44 bool isNull() const { return m_isNull; }
45
46 private:
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:
57 JSNotAnObject(ExecState* exec, JSNotAnObjectErrorStub* exception)
58 : JSObject(exec->globalData().notAnObjectStructure)
59 , m_exception(exception)
60 {
61 }
62
63 static PassRefPtr<Structure> createStructure(JSValue prototype)
64 {
65 return Structure::create(prototype, typeInfo: TypeInfo(ObjectType, StructureFlags));
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

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/runtime/JSNotAnObject.h