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 <runtime/WeakGCPtr.h> 35 #include <wtf/HashMap.h> 36 #include <wtf/RefCounted.h> 37 38 struct StaticValueEntry : FastAllocBase { StaticValueEntryStaticValueEntry39 StaticValueEntry(JSObjectGetPropertyCallback _getProperty, JSObjectSetPropertyCallback _setProperty, JSPropertyAttributes _attributes) 40 : getProperty(_getProperty), setProperty(_setProperty), attributes(_attributes) 41 { 42 } 43 44 JSObjectGetPropertyCallback getProperty; 45 JSObjectSetPropertyCallback setProperty; 46 JSPropertyAttributes attributes; 47 }; 48 49 struct StaticFunctionEntry : FastAllocBase { StaticFunctionEntryStaticFunctionEntry50 StaticFunctionEntry(JSObjectCallAsFunctionCallback _callAsFunction, JSPropertyAttributes _attributes) 51 : callAsFunction(_callAsFunction), attributes(_attributes) 52 { 53 } 54 55 JSObjectCallAsFunctionCallback callAsFunction; 56 JSPropertyAttributes attributes; 57 }; 58 59 typedef HashMap<RefPtr<JSC::UString::Rep>, StaticValueEntry*> OpaqueJSClassStaticValuesTable; 60 typedef HashMap<RefPtr<JSC::UString::Rep>, StaticFunctionEntry*> OpaqueJSClassStaticFunctionsTable; 61 62 struct OpaqueJSClass; 63 64 // An OpaqueJSClass (JSClass) is created without a context, so it can be used with any context, even across context groups. 65 // This structure holds data members that vary across context groups. 66 struct OpaqueJSClassContextData : Noncopyable { 67 OpaqueJSClassContextData(OpaqueJSClass*); 68 ~OpaqueJSClassContextData(); 69 70 // It is necessary to keep OpaqueJSClass alive because of the following rare scenario: 71 // 1. A class is created and used, so its context data is stored in JSGlobalData hash map. 72 // 2. The class is released, and when all JS objects that use it are collected, OpaqueJSClass 73 // is deleted (that's the part prevented by this RefPtr). 74 // 3. Another class is created at the same address. 75 // 4. When it is used, the old context data is found in JSGlobalData and used. 76 RefPtr<OpaqueJSClass> m_class; 77 78 OpaqueJSClassStaticValuesTable* staticValues; 79 OpaqueJSClassStaticFunctionsTable* staticFunctions; 80 JSC::WeakGCPtr<JSC::JSObject> cachedPrototype; 81 }; 82 83 struct OpaqueJSClass : public ThreadSafeShared<OpaqueJSClass> { 84 static PassRefPtr<OpaqueJSClass> create(const JSClassDefinition*); 85 static PassRefPtr<OpaqueJSClass> createNoAutomaticPrototype(const JSClassDefinition*); 86 ~OpaqueJSClass(); 87 88 JSC::UString className(); 89 OpaqueJSClassStaticValuesTable* staticValues(JSC::ExecState*); 90 OpaqueJSClassStaticFunctionsTable* staticFunctions(JSC::ExecState*); 91 JSC::JSObject* prototype(JSC::ExecState*); 92 93 OpaqueJSClass* parentClass; 94 OpaqueJSClass* prototypeClass; 95 96 JSObjectInitializeCallback initialize; 97 JSObjectFinalizeCallback finalize; 98 JSObjectHasPropertyCallback hasProperty; 99 JSObjectGetPropertyCallback getProperty; 100 JSObjectSetPropertyCallback setProperty; 101 JSObjectDeletePropertyCallback deleteProperty; 102 JSObjectGetPropertyNamesCallback getPropertyNames; 103 JSObjectCallAsFunctionCallback callAsFunction; 104 JSObjectCallAsConstructorCallback callAsConstructor; 105 JSObjectHasInstanceCallback hasInstance; 106 JSObjectConvertToTypeCallback convertToType; 107 108 private: 109 friend struct OpaqueJSClassContextData; 110 111 OpaqueJSClass(); 112 OpaqueJSClass(const OpaqueJSClass&); 113 OpaqueJSClass(const JSClassDefinition*, OpaqueJSClass* protoClass); 114 115 OpaqueJSClassContextData& contextData(JSC::ExecState*); 116 117 // UStrings in these data members should not be put into any IdentifierTable. 118 JSC::UString m_className; 119 OpaqueJSClassStaticValuesTable* m_staticValues; 120 OpaqueJSClassStaticFunctionsTable* m_staticFunctions; 121 }; 122 123 #endif // JSClassRef_h 124