WebKit/Source/JavaScriptCore/API/JSClassRef.h at main · WebKit/WebKit · GitHub

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* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions

* are met:

* 1. Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

* 2. Redistributions in binary form must reproduce the above copyright

* notice, this list of conditions and the following disclaimer in the

* documentation and/or other materials provided with the distribution.

* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY

* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR

* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef JSClassRef_h

#define JSClassRef_h

#include <JavaScriptCore/JSObjectRef.h>

#include <JavaScriptCore/OpaqueJSString.h>

#include <JavaScriptCore/Protect.h>

#include <JavaScriptCore/Weak.h>

#include <wtf/HashMap.h>

#include <wtf/text/WTFString.h>

#define STATIC_VALUE_ENTRY_METHOD(method) \

WTF_VTBL_FUNCPTR_PTRAUTH_STR("StaticValueEntry." #method) method

struct StaticValueEntry {

WTF_DEPRECATED_MAKE_FAST_ALLOCATED(StaticValueEntry);

public:

StaticValueEntry(JSObjectGetPropertyCallback _getProperty, JSObjectSetPropertyCallback _setProperty, JSPropertyAttributes _attributes, String& propertyName)

: getProperty(_getProperty)

, setProperty(_setProperty)

, attributes(_attributes)

, propertyNameRef(OpaqueJSString::tryCreate(propertyName))

{

}

JSObjectGetPropertyCallback STATIC_VALUE_ENTRY_METHOD(getProperty);

JSObjectSetPropertyCallback STATIC_VALUE_ENTRY_METHOD(setProperty);

JSPropertyAttributes attributes;

RefPtr<OpaqueJSString> propertyNameRef;

};

#undef STATIC_VALUE_ENTRY_METHOD

#define STATIC_FUNCTION_ENTRY_METHOD(method) \

WTF_VTBL_FUNCPTR_PTRAUTH_STR("StaticFunctionEntry." #method) method

struct StaticFunctionEntry {

WTF_DEPRECATED_MAKE_FAST_ALLOCATED(StaticFunctionEntry);

public:

StaticFunctionEntry(JSObjectCallAsFunctionCallback _callAsFunction, JSPropertyAttributes _attributes)

: callAsFunction(_callAsFunction), attributes(_attributes)

{

}

JSObjectCallAsFunctionCallback STATIC_FUNCTION_ENTRY_METHOD(callAsFunction);

JSPropertyAttributes attributes;

};

#undef STATIC_FUNCTION_ENTRY_METHOD

typedef UncheckedKeyHashMap<RefPtr<StringImpl>, std::unique_ptr<StaticValueEntry>> OpaqueJSClassStaticValuesTable;

typedef UncheckedKeyHashMap<RefPtr<StringImpl>, std::unique_ptr<StaticFunctionEntry>> OpaqueJSClassStaticFunctionsTable;

struct OpaqueJSClass;

// An OpaqueJSClass (JSClass) is created without a context, so it can be used with any context, even across context groups.

// This structure holds data members that vary across context groups.

struct OpaqueJSClassContextData {

WTF_MAKE_NONCOPYABLE(OpaqueJSClassContextData); WTF_DEPRECATED_MAKE_FAST_ALLOCATED(OpaqueJSClassContextData);

public:

OpaqueJSClassContextData(JSC::VM&, OpaqueJSClass*);

// It is necessary to keep OpaqueJSClass alive because of the following rare scenario:

// 1. A class is created and used, so its context data is stored in VM hash map.

// 2. The class is released, and when all JS objects that use it are collected, OpaqueJSClass

// is deleted (that's the part prevented by this RefPtr).

// 3. Another class is created at the same address.

// 4. When it is used, the old context data is found in VM and used.

const RefPtr<OpaqueJSClass> m_class;

OpaqueJSClassStaticValuesTable staticValues;

OpaqueJSClassStaticFunctionsTable staticFunctions;

JSC::Weak<JSC::JSObject> cachedPrototype;

};

#define OPAQUE_JSCLASS_METHOD(method) \

WTF_VTBL_FUNCPTR_PTRAUTH_STR("OpaqueJSClass." #method) method

struct OpaqueJSClass : public ThreadSafeRefCounted<OpaqueJSClass> {

static Ref<OpaqueJSClass> create(const JSClassDefinition*);

static Ref<OpaqueJSClass> createNoAutomaticPrototype(const JSClassDefinition*);

JS_EXPORT_PRIVATE ~OpaqueJSClass();

String className();

OpaqueJSClassStaticValuesTable* staticValues(JSC::JSGlobalObject*);

OpaqueJSClassStaticFunctionsTable* staticFunctions(JSC::JSGlobalObject*);

JSC::JSObject* prototype(JSC::JSGlobalObject*);

OpaqueJSClass* parentClass;

OpaqueJSClass* prototypeClass;

JSObjectInitializeCallback OPAQUE_JSCLASS_METHOD(initialize);

JSObjectFinalizeCallback OPAQUE_JSCLASS_METHOD(finalize);

JSObjectHasPropertyCallback OPAQUE_JSCLASS_METHOD(hasProperty);

JSObjectGetPropertyCallback OPAQUE_JSCLASS_METHOD(getProperty);

JSObjectSetPropertyCallback OPAQUE_JSCLASS_METHOD(setProperty);

JSObjectDeletePropertyCallback OPAQUE_JSCLASS_METHOD(deleteProperty);

JSObjectGetPropertyNamesCallback OPAQUE_JSCLASS_METHOD(getPropertyNames);

JSObjectCallAsFunctionCallback OPAQUE_JSCLASS_METHOD(callAsFunction);

JSObjectCallAsConstructorCallback OPAQUE_JSCLASS_METHOD(callAsConstructor);

JSObjectHasInstanceCallback OPAQUE_JSCLASS_METHOD(hasInstance);

JSObjectConvertToTypeCallback OPAQUE_JSCLASS_METHOD(convertToType);

private:

friend struct OpaqueJSClassContextData;

OpaqueJSClass();

OpaqueJSClass(const OpaqueJSClass&);

OpaqueJSClass(const JSClassDefinition*, OpaqueJSClass* protoClass);

OpaqueJSClassContextData& contextData(JSC::JSGlobalObject*);

// Strings in these data members should not be put into any AtomStringTable.

String m_className;

OpaqueJSClassStaticValuesTable m_staticValues;

OpaqueJSClassStaticFunctionsTable m_staticFunctions;

};

#undef OPAQUE_JSCLASS_METHOD

#endif // JSClassRef_h

WebKit/Source/JavaScriptCore/API/JSClassRef.h at main · WebKit/WebKit · GitHub

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