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GlobalWindowIdentifier.h
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GlobalWindowIdentifier.h
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/*
* Copyright (C) 2018 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.
*/
#pragma once
#include "ProcessIdentifier.h"
#include <wtf/HashTraits.h>
#include <wtf/Hasher.h>
#include <wtf/ObjectIdentifier.h>
namespace WebCore {
enum WindowIdentifierType { };
using WindowIdentifier = ObjectIdentifier<WindowIdentifierType>;
// Window identifier that is unique across all WebContent processes.
struct GlobalWindowIdentifier {
ProcessIdentifier processIdentifier;
WindowIdentifier windowIdentifier;
template<class Encoder> void encode(Encoder&) const;
template<class Decoder> static std::optional<GlobalWindowIdentifier> decode(Decoder&);
};
inline bool operator==(const GlobalWindowIdentifier& a, const GlobalWindowIdentifier& b)
{
return a.processIdentifier == b.processIdentifier && a.windowIdentifier == b.windowIdentifier;
}
inline void add(Hasher& hasher, const GlobalWindowIdentifier& identifier)
{
add(hasher, identifier.processIdentifier, identifier.windowIdentifier);
}
template<class Encoder>
void GlobalWindowIdentifier::encode(Encoder& encoder) const
{
encoder << processIdentifier << windowIdentifier;
}
template<class Decoder>
std::optional<GlobalWindowIdentifier> GlobalWindowIdentifier::decode(Decoder& decoder)
{
std::optional<ProcessIdentifier> processIdentifier;
decoder >> processIdentifier;
if (!processIdentifier)
return std::nullopt;
std::optional<WindowIdentifier> windowIdentifier;
decoder >> windowIdentifier;
if (!windowIdentifier)
return std::nullopt;
return { { WTFMove(*processIdentifier), WTFMove(*windowIdentifier) } };
}
} // namespace WebCore
namespace WTF {
struct GlobalWindowIdentifierHash {
static unsigned hash(const WebCore::GlobalWindowIdentifier& key) { return computeHash(key); }
static bool equal(const WebCore::GlobalWindowIdentifier& a, const WebCore::GlobalWindowIdentifier& b) { return a == b; }
static const bool safeToCompareToEmptyOrDeleted = true;
};
template<> struct HashTraits<WebCore::GlobalWindowIdentifier> : GenericHashTraits<WebCore::GlobalWindowIdentifier> {
static WebCore::GlobalWindowIdentifier emptyValue() { return { }; }
static void constructDeletedValue(WebCore::GlobalWindowIdentifier& slot)
{
new (NotNull, &slot.processIdentifier) WebCore::ProcessIdentifier(WTF::HashTableDeletedValue);
new (NotNull, &slot.windowIdentifier) WebCore::WindowIdentifier(WTF::HashTableDeletedValue);
}
static bool isDeletedValue(const WebCore::GlobalWindowIdentifier& slot) { return slot.windowIdentifier.isHashTableDeletedValue(); }
};
template<> struct DefaultHash<WebCore::GlobalWindowIdentifier> : GlobalWindowIdentifierHash { };
} // namespace WTF