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), setProperty(_setProperty), attributes(_attributes), propertyNameRef(OpaqueJSString::create(propertyName)) 41 { 42 } 43 44 JSObjectGetPropertyCallback getProperty; 45 JSObjectSetPropertyCallback setProperty; 46 JSPropertyAttributes attributes; 47 RefPtr<OpaqueJSString> propertyNameRef; 48}; 49 50struct StaticFunctionEntry { 51 WTF_MAKE_FAST_ALLOCATED; 52public: 53 StaticFunctionEntry(JSObjectCallAsFunctionCallback _callAsFunction, JSPropertyAttributes _attributes) 54 : callAsFunction(_callAsFunction), attributes(_attributes) 55 { 56 } 57 58 JSObjectCallAsFunctionCallback callAsFunction; 59 JSPropertyAttributes attributes; 60}; 61 62typedef HashMap<RefPtr<StringImpl>, std::unique_ptr<StaticValueEntry>> OpaqueJSClassStaticValuesTable; 63typedef HashMap<RefPtr<StringImpl>, std::unique_ptr<StaticFunctionEntry>> OpaqueJSClassStaticFunctionsTable; 64 65struct OpaqueJSClass; 66 67// An OpaqueJSClass (JSClass) is created without a context, so it can be used with any context, even across context groups. 68// This structure holds data members that vary across context groups. 69struct OpaqueJSClassContextData { 70 WTF_MAKE_NONCOPYABLE(OpaqueJSClassContextData); WTF_MAKE_FAST_ALLOCATED; 71public: 72 OpaqueJSClassContextData(JSC::VM&, OpaqueJSClass*); 73 74 // It is necessary to keep OpaqueJSClass alive because of the following rare scenario: 75 // 1. A class is created and used, so its context data is stored in VM hash map. 76 // 2. The class is released, and when all JS objects that use it are collected, OpaqueJSClass 77 // is deleted (that's the part prevented by this RefPtr). 78 // 3. Another class is created at the same address. 79 // 4. When it is used, the old context data is found in VM and used. 80 RefPtr<OpaqueJSClass> m_class; 81 82 std::unique_ptr<OpaqueJSClassStaticValuesTable> staticValues; 83 std::unique_ptr<OpaqueJSClassStaticFunctionsTable> staticFunctions; 84 JSC::Weak<JSC::JSObject> cachedPrototype; 85}; 86 87struct OpaqueJSClass : public ThreadSafeRefCounted<OpaqueJSClass> { 88 static PassRefPtr<OpaqueJSClass> create(const JSClassDefinition*); 89 static PassRefPtr<OpaqueJSClass> createNoAutomaticPrototype(const JSClassDefinition*); 90 JS_EXPORT_PRIVATE ~OpaqueJSClass(); 91 92 String className(); 93 OpaqueJSClassStaticValuesTable* staticValues(JSC::ExecState*); 94 OpaqueJSClassStaticFunctionsTable* staticFunctions(JSC::ExecState*); 95 JSC::JSObject* prototype(JSC::ExecState*); 96 97 OpaqueJSClass* parentClass; 98 OpaqueJSClass* prototypeClass; 99 100 JSObjectInitializeCallback initialize; 101 JSObjectFinalizeCallback finalize; 102 JSObjectHasPropertyCallback hasProperty; 103 JSObjectGetPropertyCallback getProperty; 104 JSObjectSetPropertyCallback setProperty; 105 JSObjectDeletePropertyCallback deleteProperty; 106 JSObjectGetPropertyNamesCallback getPropertyNames; 107 JSObjectCallAsFunctionCallback callAsFunction; 108 JSObjectCallAsConstructorCallback callAsConstructor; 109 JSObjectHasInstanceCallback hasInstance; 110 JSObjectConvertToTypeCallback convertToType; 111 112private: 113 friend struct OpaqueJSClassContextData; 114 115 OpaqueJSClass(); 116 OpaqueJSClass(const OpaqueJSClass&); 117 OpaqueJSClass(const JSClassDefinition*, OpaqueJSClass* protoClass); 118 119 OpaqueJSClassContextData& contextData(JSC::ExecState*); 120 121 // Strings in these data members should not be put into any AtomicStringTable. 122 String m_className; 123 OwnPtr<OpaqueJSClassStaticValuesTable> m_staticValues; 124 OwnPtr<OpaqueJSClassStaticFunctionsTable> m_staticFunctions; 125}; 126 127#endif // JSClassRef_h 128