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/*
* Copyright (C) 2025 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. AND ITS CONTRIBUTORS ``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 ITS 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 "WebKitJSHandle.h"
#include "DOMWindow.h"
#include "Frame.h"
#include "JSWindowProxy.h"
#include <JavaScriptCore/JSCellInlines.h>
#include <JavaScriptCore/JSObject.h>
namespace WebCore {
// FIXME: Make PairHashTraits work with PeekTypes and use a map<identifier, pair> instead of 2 hash lookups.
struct StrongReferenceAndRefCount {
JSC::Strong<JSC::JSObject> strongReference;
size_t refCount { 0 };
};
using HandleMap = HashMap<JSHandleIdentifier, StrongReferenceAndRefCount>;
static HandleMap& handleMap()
{
static MainThreadNeverDestroyed<HandleMap> map;
return map.get();
}
using GlobalObjectMap = HashMap<JSHandleIdentifier, JSC::JSGlobalObject*>;
static GlobalObjectMap& globalObjectMap()
{
static MainThreadNeverDestroyed<GlobalObjectMap> map;
return map.get();
}
Ref<WebKitJSHandle> WebKitJSHandle::create(JSC::JSGlobalObject& globalObject, JSC::JSObject* object)
{
return adoptRef(*new WebKitJSHandle(globalObject, object));
}
void WebKitJSHandle::jsHandleDestroyed(JSHandleIdentifier identifier)
{
auto it = handleMap().find(identifier);
ASSERT(it != handleMap().end());
if (it != handleMap().end()) {
if (!--it->value.refCount)
handleMap().remove(identifier);
else
return;
}
ASSERT(globalObjectMap().contains(identifier));
globalObjectMap().remove(identifier);
}
std::pair<JSC::JSGlobalObject*, JSC::JSObject*> WebKitJSHandle::objectForIdentifier(JSHandleIdentifier identifier)
{
return { globalObjectMap().get(identifier), handleMap().get(identifier).strongReference.get() };
}
static Markable<FrameIdentifier> windowFrameIdentifier(JSC::JSObject* object)
{
if (auto* window = jsDynamicCast<WebCore::JSWindowProxy*>(object)) {
if (RefPtr frame = window->protectedWrapped()->frame())
return frame->frameID();
}
return std::nullopt;
}
WebKitJSHandle::WebKitJSHandle(JSC::JSGlobalObject& globalObject, JSC::JSObject* object)
: m_identifier(JSHandleIdentifier(WebProcessJSHandleIdentifier(reinterpret_cast<uintptr_t>(object)), Process::identifier()))
, m_windowFrameIdentifier(WebCore::windowFrameIdentifier(object))
{
auto addResult = handleMap().ensure(m_identifier, [&] {
return StrongReferenceAndRefCount {
JSC::Strong<JSC::JSObject> { globalObject.vm(), object },
0 // Immediately incremented.
};
});
addResult.iterator->value.refCount++;
globalObjectMap().add(m_identifier, &globalObject);
}
}
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