Source/JavaScriptCore/API/JSWeakPrivate.cpp

/*
 * Copyright (C) 2017-2022 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. 
 */

#include "config.h"
#include "JSWeakPrivate.h"

#include "APICast.h"
#include "IntegrityInlines.h"
#include "Weak.h"
#include <wtf/ThreadSafeRefCounted.h>

using namespace JSC;

struct OpaqueJSWeak : ThreadSafeRefCounted<OpaqueJSWeak> {
    OpaqueJSWeak(JSObject* object)
        : weak(object)
    {
    }
    
    Weak<JSObject> weak;
};

JSWeakRef JSWeakCreate(JSContextGroupRef contextGroup, JSObjectRef objectRef)
{
    VM* vm = toJS(contextGroup);
    JSLockHolder locker(vm);
    return new OpaqueJSWeak(toJS(objectRef));
}

void JSWeakRetain(JSContextGroupRef contextGroup, JSWeakRef weakRef)
{
    VM* vm = toJS(contextGroup);
    JSLockHolder locker(vm);
    weakRef->ref();
}

void JSWeakRelease(JSContextGroupRef contextGroup, JSWeakRef weakRef)
{
    VM* vm = toJS(contextGroup);
    JSLockHolder locker(vm);
    weakRef->deref();
}

JSObjectRef JSWeakGetObject(JSWeakRef weakRef)
{
    return toRef(weakRef->weak.get());
}