104 lines
3.9 KiB
C++
104 lines
3.9 KiB
C++
/*
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* Copyright (C) 2018 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "ProcessIdentifier.h"
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#include <wtf/HashTraits.h>
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#include <wtf/ObjectIdentifier.h>
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namespace WebCore {
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enum WindowIdentifierType { };
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using WindowIdentifier = ObjectIdentifier<WindowIdentifierType>;
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// Window identifier that is unique across all WebContent processes.
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struct GlobalWindowIdentifier {
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ProcessIdentifier processIdentifier;
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WindowIdentifier windowIdentifier;
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unsigned hash() const;
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template<class Encoder> void encode(Encoder&) const;
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template<class Decoder> static std::optional<GlobalWindowIdentifier> decode(Decoder&);
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};
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inline bool operator==(const GlobalWindowIdentifier& a, const GlobalWindowIdentifier& b)
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{
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return a.processIdentifier == b.processIdentifier && a.windowIdentifier == b.windowIdentifier;
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}
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inline unsigned GlobalWindowIdentifier::hash() const
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{
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uint64_t identifiers[2];
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identifiers[0] = processIdentifier.toUInt64();
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identifiers[1] = windowIdentifier.toUInt64();
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return StringHasher::hashMemory(identifiers, sizeof(identifiers));
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}
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template<class Encoder>
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void GlobalWindowIdentifier::encode(Encoder& encoder) const
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{
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encoder << processIdentifier << windowIdentifier;
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}
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template<class Decoder>
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std::optional<GlobalWindowIdentifier> GlobalWindowIdentifier::decode(Decoder& decoder)
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{
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std::optional<ProcessIdentifier> processIdentifier;
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decoder >> processIdentifier;
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if (!processIdentifier)
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return std::nullopt;
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std::optional<WindowIdentifier> windowIdentifier;
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decoder >> windowIdentifier;
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if (!windowIdentifier)
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return std::nullopt;
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return { { WTFMove(*processIdentifier), WTFMove(*windowIdentifier) } };
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}
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} // namespace WebCore
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namespace WTF {
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struct GlobalWindowIdentifierHash {
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static unsigned hash(const WebCore::GlobalWindowIdentifier& key) { return key.hash(); }
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static bool equal(const WebCore::GlobalWindowIdentifier& a, const WebCore::GlobalWindowIdentifier& b) { return a == b; }
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static const bool safeToCompareToEmptyOrDeleted = true;
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};
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template<> struct HashTraits<WebCore::GlobalWindowIdentifier> : GenericHashTraits<WebCore::GlobalWindowIdentifier> {
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static WebCore::GlobalWindowIdentifier emptyValue() { return { }; }
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static void constructDeletedValue(WebCore::GlobalWindowIdentifier& slot) { new (NotNull, &slot.windowIdentifier) WebCore::WindowIdentifier(WTF::HashTableDeletedValue); }
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static bool isDeletedValue(const WebCore::GlobalWindowIdentifier& slot) { return slot.windowIdentifier.isHashTableDeletedValue(); }
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};
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template<> struct DefaultHash<WebCore::GlobalWindowIdentifier> : GlobalWindowIdentifierHash { };
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} // namespace WTF
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