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
36namespace WebCore {
37using namespace JSC;
38
39class JSGlobalObjectCallback final : public RefCounted<JSGlobalObjectCallback>, private ActiveDOMCallback {
40public:
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
66private:
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
78JSGlobalObjectTask::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