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 "Weak.h" 32 #include "JSObject.h" 33 #include "Protect.h" 34 #include "UString.h" 35 #include <wtf/HashMap.h> 36 37 struct StaticValueEntry { 38 WTF_MAKE_FAST_ALLOCATED; 39 public: StaticValueEntryStaticValueEntry40 StaticValueEntry(JSObjectGetPropertyCallback _getProperty, JSObjectSetPropertyCallback _setProperty, JSPropertyAttributes _attributes) 41 : getProperty(_getProperty), setProperty(_setProperty), attributes(_attributes) 42 { 43 } 44 45 JSObjectGetPropertyCallback getProperty; 46 JSObjectSetPropertyCallback setProperty; 47 JSPropertyAttributes attributes; 48 }; 49 50 struct StaticFunctionEntry { 51 WTF_MAKE_FAST_ALLOCATED; 52 public: StaticFunctionEntryStaticFunctionEntry53 StaticFunctionEntry(JSObjectCallAsFunctionCallback _callAsFunction, JSPropertyAttributes _attributes) 54 : callAsFunction(_callAsFunction), attributes(_attributes) 55 { 56 } 57 58 JSObjectCallAsFunctionCallback callAsFunction; 59 JSPropertyAttributes attributes; 60 }; 61 62 typedef HashMap<RefPtr<StringImpl>, StaticValueEntry*> OpaqueJSClassStaticValuesTable; 63 typedef HashMap<RefPtr<StringImpl>, StaticFunctionEntry*> OpaqueJSClassStaticFunctionsTable; 64 65 struct 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. 69 struct OpaqueJSClassContextData { 70 WTF_MAKE_NONCOPYABLE(OpaqueJSClassContextData); WTF_MAKE_FAST_ALLOCATED; 71 public: 72 OpaqueJSClassContextData(JSC::JSGlobalData&, OpaqueJSClass*); 73 ~OpaqueJSClassContextData(); 74 75 // It is necessary to keep OpaqueJSClass alive because of the following rare scenario: 76 // 1. A class is created and used, so its context data is stored in JSGlobalData hash map. 77 // 2. The class is released, and when all JS objects that use it are collected, OpaqueJSClass 78 // is deleted (that's the part prevented by this RefPtr). 79 // 3. Another class is created at the same address. 80 // 4. When it is used, the old context data is found in JSGlobalData and used. 81 RefPtr<OpaqueJSClass> m_class; 82 83 OpaqueJSClassStaticValuesTable* staticValues; 84 OpaqueJSClassStaticFunctionsTable* staticFunctions; 85 JSC::Weak<JSC::JSObject> cachedPrototype; 86 }; 87 88 struct OpaqueJSClass : public ThreadSafeRefCounted<OpaqueJSClass> { 89 static PassRefPtr<OpaqueJSClass> create(const JSClassDefinition*); 90 static PassRefPtr<OpaqueJSClass> createNoAutomaticPrototype(const JSClassDefinition*); 91 ~OpaqueJSClass(); 92 93 JSC::UString className(); 94 OpaqueJSClassStaticValuesTable* staticValues(JSC::ExecState*); 95 OpaqueJSClassStaticFunctionsTable* staticFunctions(JSC::ExecState*); 96 JSC::JSObject* prototype(JSC::ExecState*); 97 98 OpaqueJSClass* parentClass; 99 OpaqueJSClass* prototypeClass; 100 101 JSObjectInitializeCallback initialize; 102 JSObjectFinalizeCallback finalize; 103 JSObjectHasPropertyCallback hasProperty; 104 JSObjectGetPropertyCallback getProperty; 105 JSObjectSetPropertyCallback setProperty; 106 JSObjectDeletePropertyCallback deleteProperty; 107 JSObjectGetPropertyNamesCallback getPropertyNames; 108 JSObjectCallAsFunctionCallback callAsFunction; 109 JSObjectCallAsConstructorCallback callAsConstructor; 110 JSObjectHasInstanceCallback hasInstance; 111 JSObjectConvertToTypeCallback convertToType; 112 113 private: 114 friend struct OpaqueJSClassContextData; 115 116 OpaqueJSClass(); 117 OpaqueJSClass(const OpaqueJSClass&); 118 OpaqueJSClass(const JSClassDefinition*, OpaqueJSClass* protoClass); 119 120 OpaqueJSClassContextData& contextData(JSC::ExecState*); 121 122 // UStrings in these data members should not be put into any IdentifierTable. 123 JSC::UString m_className; 124 OpaqueJSClassStaticValuesTable* m_staticValues; 125 OpaqueJSClassStaticFunctionsTable* m_staticFunctions; 126 }; 127 128 #endif // JSClassRef_h 129