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 | |
32 | namespace WebCore { |
33 | |
34 | enum WindowIdentifierType { }; |
35 | using WindowIdentifier = ObjectIdentifier<WindowIdentifierType>; |
36 | |
37 | // Window identifier that is unique across all WebContent processes. |
38 | struct 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 | |
48 | inline bool operator==(const GlobalWindowIdentifier& a, const GlobalWindowIdentifier& b) |
49 | { |
50 | return a.processIdentifier == b.processIdentifier && a.windowIdentifier == b.windowIdentifier; |
51 | } |
52 | |
53 | inline 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 | |
62 | template<class Encoder> |
63 | void GlobalWindowIdentifier::encode(Encoder& encoder) const |
64 | { |
65 | encoder << processIdentifier << windowIdentifier; |
66 | } |
67 | |
68 | template<class Decoder> |
69 | Optional<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 | |
86 | namespace WTF { |
87 | |
88 | struct 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 | |
94 | template<> 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 | |
101 | template<> struct DefaultHash<WebCore::GlobalWindowIdentifier> { |
102 | typedef GlobalWindowIdentifierHash Hash; |
103 | }; |
104 | |
105 | } // namespace WTF |
106 | |