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      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:
     40     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:
     53     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