1 | /* |
2 | * Copyright (C) 2013-2017 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 | #include "config.h" |
27 | #include "JSDOMGlobalObjectTask.h" |
28 | |
29 | #include "ActiveDOMCallback.h" |
30 | #include "JSDOMGlobalObject.h" |
31 | #include "JSExecState.h" |
32 | #include <JavaScriptCore/Microtask.h> |
33 | #include <JavaScriptCore/StrongInlines.h> |
34 | #include <wtf/Ref.h> |
35 | |
36 | namespace WebCore { |
37 | using namespace JSC; |
38 | |
39 | class JSGlobalObjectCallback final : public RefCounted<JSGlobalObjectCallback>, private ActiveDOMCallback { |
40 | public: |
41 | static Ref<JSGlobalObjectCallback> create(JSDOMGlobalObject& globalObject, Ref<Microtask>&& task) |
42 | { |
43 | return adoptRef(*new JSGlobalObjectCallback(globalObject, WTFMove(task))); |
44 | } |
45 | |
46 | void call() |
47 | { |
48 | if (!canInvokeCallback()) |
49 | return; |
50 | |
51 | Ref<JSGlobalObjectCallback> protectedThis(*this); |
52 | VM& vm = m_globalObject->vm(); |
53 | JSLockHolder lock(vm); |
54 | auto scope = DECLARE_THROW_SCOPE(vm); |
55 | |
56 | ExecState* exec = m_globalObject->globalExec(); |
57 | |
58 | ScriptExecutionContext* context = m_globalObject->scriptExecutionContext(); |
59 | // We will fail to get the context if the frame has been detached. |
60 | if (!context) |
61 | return; |
62 | JSExecState::runTask(exec, m_task); |
63 | scope.assertNoException(); |
64 | } |
65 | |
66 | private: |
67 | JSGlobalObjectCallback(JSDOMGlobalObject& globalObject, Ref<Microtask>&& task) |
68 | : ActiveDOMCallback { globalObject.scriptExecutionContext() } |
69 | , m_globalObject { globalObject.vm(), &globalObject } |
70 | , m_task { WTFMove(task) } |
71 | { |
72 | } |
73 | |
74 | Strong<JSDOMGlobalObject> m_globalObject; |
75 | Ref<Microtask> m_task; |
76 | }; |
77 | |
78 | JSGlobalObjectTask::JSGlobalObjectTask(JSDOMGlobalObject& globalObject, Ref<Microtask>&& task) |
79 | : ScriptExecutionContext::Task({ }) |
80 | { |
81 | auto callback = JSGlobalObjectCallback::create(globalObject, WTFMove(task)); |
82 | m_task = [callback = WTFMove(callback)] (ScriptExecutionContext&) { |
83 | callback->call(); |
84 | }; |
85 | } |
86 | |
87 | } // namespace WebCore |
88 | |