1/* 2 * Copyright (C) 2013 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 "JSMainThreadExecState.h" 31#include <heap/StrongInlines.h> 32#include <runtime/Microtask.h> 33#include <wtf/Ref.h> 34 35using namespace JSC; 36 37namespace WebCore { 38 39class JSGlobalObjectCallback final : public RefCounted<JSGlobalObjectCallback>, private ActiveDOMCallback { 40public: 41 static PassRefPtr<JSGlobalObjectCallback> create(JSDOMGlobalObject* globalObject, PassRefPtr<Microtask> task) 42 { 43 return adoptRef(new JSGlobalObjectCallback(globalObject, task)); 44 } 45 46 void call() 47 { 48 if (!canInvokeCallback()) 49 return; 50 51 Ref<JSGlobalObjectCallback> protect(*this); 52 JSLockHolder lock(m_globalObject->vm()); 53 54 ExecState* exec = m_globalObject->globalExec(); 55 56 ScriptExecutionContext* context = m_globalObject->scriptExecutionContext(); 57 // We will fail to get the context if the frame has been detached. 58 if (!context) 59 return; 60 61 // When on the main thread (e.g. the document's thread), we need to make sure to 62 // push the current ExecState on to the JSMainThreadExecState stack. 63 if (context->isDocument()) 64 JSMainThreadExecState::runTask(exec, *m_task.get()); 65 else 66 m_task->run(exec); 67 ASSERT(!exec->hadException()); 68 } 69 70private: 71 JSGlobalObjectCallback(JSDOMGlobalObject* globalObject, PassRefPtr<Microtask> task) 72 : ActiveDOMCallback(globalObject->scriptExecutionContext()) 73 , m_globalObject(globalObject->vm(), globalObject) 74 , m_task(task) 75 { 76 } 77 78 Strong<JSDOMGlobalObject> m_globalObject; 79 RefPtr<Microtask> m_task; 80}; 81 82JSGlobalObjectTask::JSGlobalObjectTask(JSDOMGlobalObject* globalObject, PassRefPtr<Microtask> task) 83 : ScriptExecutionContext::Task(nullptr) 84{ 85 RefPtr<JSGlobalObjectCallback> callback = JSGlobalObjectCallback::create(globalObject, task); 86 m_task = [=] (ScriptExecutionContext&) { 87 callback->call(); 88 }; 89} 90 91} // namespace WebCore 92