1/*
2 * Copyright (C) 2006 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 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef JSClassRef_h
27#define JSClassRef_h
28
29#include "OpaqueJSString.h"
30#include "Protect.h"
31#include "Weak.h"
32#include <JavaScriptCore/JSObjectRef.h>
33#include <wtf/HashMap.h>
34#include <wtf/text/WTFString.h>
35
36struct StaticValueEntry {
37 WTF_MAKE_FAST_ALLOCATED;
38public:
39 StaticValueEntry(JSObjectGetPropertyCallback _getProperty, JSObjectSetPropertyCallback _setProperty, JSPropertyAttributes _attributes, String& propertyName)
40 : getProperty(_getProperty)
41 , setProperty(_setProperty)
42 , attributes(_attributes)
43 , propertyNameRef(OpaqueJSString::tryCreate(propertyName))
44 {
45 }
46
47 JSObjectGetPropertyCallback getProperty;
48 JSObjectSetPropertyCallback setProperty;
49 JSPropertyAttributes attributes;
50 RefPtr<OpaqueJSString> propertyNameRef;
51};
52
53struct StaticFunctionEntry {
54 WTF_MAKE_FAST_ALLOCATED;
55public:
56 StaticFunctionEntry(JSObjectCallAsFunctionCallback _callAsFunction, JSPropertyAttributes _attributes)
57 : callAsFunction(_callAsFunction), attributes(_attributes)
58 {
59 }
60
61 JSObjectCallAsFunctionCallback callAsFunction;
62 JSPropertyAttributes attributes;
63};
64
65typedef HashMap<RefPtr<StringImpl>, std::unique_ptr<StaticValueEntry>> OpaqueJSClassStaticValuesTable;
66typedef HashMap<RefPtr<StringImpl>, std::unique_ptr<StaticFunctionEntry>> OpaqueJSClassStaticFunctionsTable;
67
68struct OpaqueJSClass;
69
70// An OpaqueJSClass (JSClass) is created without a context, so it can be used with any context, even across context groups.
71// This structure holds data members that vary across context groups.
72struct OpaqueJSClassContextData {
73 WTF_MAKE_NONCOPYABLE(OpaqueJSClassContextData); WTF_MAKE_FAST_ALLOCATED;
74public:
75 OpaqueJSClassContextData(JSC::VM&, OpaqueJSClass*);
76
77 // It is necessary to keep OpaqueJSClass alive because of the following rare scenario:
78 // 1. A class is created and used, so its context data is stored in VM hash map.
79 // 2. The class is released, and when all JS objects that use it are collected, OpaqueJSClass
80 // is deleted (that's the part prevented by this RefPtr).
81 // 3. Another class is created at the same address.
82 // 4. When it is used, the old context data is found in VM and used.
83 RefPtr<OpaqueJSClass> m_class;
84
85 std::unique_ptr<OpaqueJSClassStaticValuesTable> staticValues;
86 std::unique_ptr<OpaqueJSClassStaticFunctionsTable> staticFunctions;
87 JSC::Weak<JSC::JSObject> cachedPrototype;
88};
89
90struct OpaqueJSClass : public ThreadSafeRefCounted<OpaqueJSClass> {
91 static Ref<OpaqueJSClass> create(const JSClassDefinition*);
92 static Ref<OpaqueJSClass> createNoAutomaticPrototype(const JSClassDefinition*);
93 JS_EXPORT_PRIVATE ~OpaqueJSClass();
94
95 String className();
96 OpaqueJSClassStaticValuesTable* staticValues(JSC::ExecState*);
97 OpaqueJSClassStaticFunctionsTable* staticFunctions(JSC::ExecState*);
98 JSC::JSObject* prototype(JSC::ExecState*);
99
100 OpaqueJSClass* parentClass;
101 OpaqueJSClass* prototypeClass;
102
103 JSObjectInitializeCallback initialize;
104 JSObjectFinalizeCallback finalize;
105 JSObjectHasPropertyCallback hasProperty;
106 JSObjectGetPropertyCallback getProperty;
107 JSObjectSetPropertyCallback setProperty;
108 JSObjectDeletePropertyCallback deleteProperty;
109 JSObjectGetPropertyNamesCallback getPropertyNames;
110 JSObjectCallAsFunctionCallback callAsFunction;
111 JSObjectCallAsConstructorCallback callAsConstructor;
112 JSObjectHasInstanceCallback hasInstance;
113 JSObjectConvertToTypeCallback convertToType;
114
115private:
116 friend struct OpaqueJSClassContextData;
117
118 OpaqueJSClass();
119 OpaqueJSClass(const OpaqueJSClass&);
120 OpaqueJSClass(const JSClassDefinition*, OpaqueJSClass* protoClass);
121
122 OpaqueJSClassContextData& contextData(JSC::ExecState*);
123
124 // Strings in these data members should not be put into any AtomicStringTable.
125 String m_className;
126 std::unique_ptr<OpaqueJSClassStaticValuesTable> m_staticValues;
127 std::unique_ptr<OpaqueJSClassStaticFunctionsTable> m_staticFunctions;
128};
129
130#endif // JSClassRef_h
131