1 /* 2 * Copyright (C) 2006 Apple Computer, 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 COMPUTER, 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 COMPUTER, 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 "JSObjectRef.h" 30 31 #include <runtime/JSObject.h> 32 #include <runtime/Protect.h> 33 #include <runtime/UString.h> 34 #include <wtf/HashMap.h> 35 #include <wtf/RefCounted.h> 36 37 struct StaticValueEntry { StaticValueEntryStaticValueEntry38 StaticValueEntry(JSObjectGetPropertyCallback _getProperty, JSObjectSetPropertyCallback _setProperty, JSPropertyAttributes _attributes) 39 : getProperty(_getProperty), setProperty(_setProperty), attributes(_attributes) 40 { 41 } 42 43 JSObjectGetPropertyCallback getProperty; 44 JSObjectSetPropertyCallback setProperty; 45 JSPropertyAttributes attributes; 46 }; 47 48 struct StaticFunctionEntry { StaticFunctionEntryStaticFunctionEntry49 StaticFunctionEntry(JSObjectCallAsFunctionCallback _callAsFunction, JSPropertyAttributes _attributes) 50 : callAsFunction(_callAsFunction), attributes(_attributes) 51 { 52 } 53 54 JSObjectCallAsFunctionCallback callAsFunction; 55 JSPropertyAttributes attributes; 56 }; 57 58 typedef HashMap<RefPtr<JSC::UString::Rep>, StaticValueEntry*> OpaqueJSClassStaticValuesTable; 59 typedef HashMap<RefPtr<JSC::UString::Rep>, StaticFunctionEntry*> OpaqueJSClassStaticFunctionsTable; 60 61 class OpaqueJSClass; 62 63 // An OpaqueJSClass (JSClass) is created without a context, so it can be used with any context, even across context groups. 64 // This structure holds data members that vary across context groups. 65 struct OpaqueJSClassContextData : Noncopyable { 66 OpaqueJSClassContextData(OpaqueJSClass*); 67 ~OpaqueJSClassContextData(); 68 69 // It is necessary to keep OpaqueJSClass alive because of the following rare scenario: 70 // 1. A class is created and used, so its context data is stored in JSGlobalData hash map. 71 // 2. The class is released, and when all JS objects that use it are collected, OpaqueJSClass 72 // is deleted (that's the part prevented by this RefPtr). 73 // 3. Another class is created at the same address. 74 // 4. When it is used, the old context data is found in JSGlobalData and used. 75 RefPtr<OpaqueJSClass> m_class; 76 77 OpaqueJSClassStaticValuesTable* staticValues; 78 OpaqueJSClassStaticFunctionsTable* staticFunctions; 79 JSC::JSObject* cachedPrototype; 80 }; 81 82 struct OpaqueJSClass : public ThreadSafeShared<OpaqueJSClass> { 83 static PassRefPtr<OpaqueJSClass> create(const JSClassDefinition*); 84 static PassRefPtr<OpaqueJSClass> createNoAutomaticPrototype(const JSClassDefinition*); 85 ~OpaqueJSClass(); 86 87 JSC::UString className(); 88 OpaqueJSClassStaticValuesTable* staticValues(JSC::ExecState*); 89 OpaqueJSClassStaticFunctionsTable* staticFunctions(JSC::ExecState*); 90 JSC::JSObject* prototype(JSC::ExecState*); 91 92 OpaqueJSClass* parentClass; 93 OpaqueJSClass* prototypeClass; 94 95 JSObjectInitializeCallback initialize; 96 JSObjectFinalizeCallback finalize; 97 JSObjectHasPropertyCallback hasProperty; 98 JSObjectGetPropertyCallback getProperty; 99 JSObjectSetPropertyCallback setProperty; 100 JSObjectDeletePropertyCallback deleteProperty; 101 JSObjectGetPropertyNamesCallback getPropertyNames; 102 JSObjectCallAsFunctionCallback callAsFunction; 103 JSObjectCallAsConstructorCallback callAsConstructor; 104 JSObjectHasInstanceCallback hasInstance; 105 JSObjectConvertToTypeCallback convertToType; 106 107 private: 108 friend struct OpaqueJSClassContextData; 109 110 OpaqueJSClass(); 111 OpaqueJSClass(const OpaqueJSClass&); 112 OpaqueJSClass(const JSClassDefinition*, OpaqueJSClass* protoClass); 113 114 OpaqueJSClassContextData& contextData(JSC::ExecState*); 115 116 // UStrings in these data members should not be put into any IdentifierTable. 117 JSC::UString m_className; 118 OpaqueJSClassStaticValuesTable* m_staticValues; 119 OpaqueJSClassStaticFunctionsTable* m_staticFunctions; 120 }; 121 122 #endif // JSClassRef_h 123