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 

    37 struct StaticValueEntry : FastAllocBase {

    38     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 : FastAllocBase {

    49     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 struct 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::WeakGCPtr<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