1/*
2 * Copyright (C) 2018 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "ProcessIdentifier.h"
29#include <wtf/HashTraits.h>
30#include <wtf/ObjectIdentifier.h>
31
32namespace WebCore {
33
34enum WindowIdentifierType { };
35using WindowIdentifier = ObjectIdentifier<WindowIdentifierType>;
36
37// Window identifier that is unique across all WebContent processes.
38struct GlobalWindowIdentifier {
39 ProcessIdentifier processIdentifier;
40 WindowIdentifier windowIdentifier;
41
42 unsigned hash() const;
43
44 template<class Encoder> void encode(Encoder&) const;
45 template<class Decoder> static Optional<GlobalWindowIdentifier> decode(Decoder&);
46};
47
48inline bool operator==(const GlobalWindowIdentifier& a, const GlobalWindowIdentifier& b)
49{
50 return a.processIdentifier == b.processIdentifier && a.windowIdentifier == b.windowIdentifier;
51}
52
53inline unsigned GlobalWindowIdentifier::hash() const
54{
55 uint64_t identifiers[2];
56 identifiers[0] = processIdentifier.toUInt64();
57 identifiers[1] = windowIdentifier.toUInt64();
58
59 return StringHasher::hashMemory(identifiers, sizeof(identifiers));
60}
61
62template<class Encoder>
63void GlobalWindowIdentifier::encode(Encoder& encoder) const
64{
65 encoder << processIdentifier << windowIdentifier;
66}
67
68template<class Decoder>
69Optional<GlobalWindowIdentifier> GlobalWindowIdentifier::decode(Decoder& decoder)
70{
71 Optional<ProcessIdentifier> processIdentifier;
72 decoder >> processIdentifier;
73 if (!processIdentifier)
74 return WTF::nullopt;
75
76 Optional<WindowIdentifier> windowIdentifier;
77 decoder >> windowIdentifier;
78 if (!windowIdentifier)
79 return WTF::nullopt;
80
81 return { { WTFMove(*processIdentifier), WTFMove(*windowIdentifier) } };
82}
83
84} // namespace WebCore
85
86namespace WTF {
87
88struct GlobalWindowIdentifierHash {
89 static unsigned hash(const WebCore::GlobalWindowIdentifier& key) { return key.hash(); }
90 static bool equal(const WebCore::GlobalWindowIdentifier& a, const WebCore::GlobalWindowIdentifier& b) { return a == b; }
91 static const bool safeToCompareToEmptyOrDeleted = true;
92};
93
94template<> struct HashTraits<WebCore::GlobalWindowIdentifier> : GenericHashTraits<WebCore::GlobalWindowIdentifier> {
95 static WebCore::GlobalWindowIdentifier emptyValue() { return { }; }
96
97 static void constructDeletedValue(WebCore::GlobalWindowIdentifier& slot) { slot.windowIdentifier = makeObjectIdentifier<WebCore::WindowIdentifierType>(std::numeric_limits<uint64_t>::max()); }
98 static bool isDeletedValue(const WebCore::GlobalWindowIdentifier& slot) { return slot.windowIdentifier.toUInt64() == std::numeric_limits<uint64_t>::max(); }
99};
100
101template<> struct DefaultHash<WebCore::GlobalWindowIdentifier> {
102 typedef GlobalWindowIdentifierHash Hash;
103};
104
105} // namespace WTF
106