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/*
* Copyright (C) 2006-2022 Apple Inc. All rights reserved.
*
* 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 "OpaqueJSString.h"
#include "Protect.h"
#include "Weak.h"
#include <JavaScriptCore/JSObjectRef.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_MAKE_FAST_ALLOCATED;
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_MAKE_FAST_ALLOCATED;
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_MAKE_FAST_ALLOCATED;
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.
RefPtr<OpaqueJSClass> m_class;
std::unique_ptr<OpaqueJSClassStaticValuesTable> staticValues;
std::unique_ptr<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;
std::unique_ptr<OpaqueJSClassStaticValuesTable> m_staticValues;
std::unique_ptr<OpaqueJSClassStaticFunctionsTable> m_staticFunctions;
};
#undef OPAQUE_JSCLASS_METHOD
#endif // JSClassRef_h
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