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1 /*
2  * Copyright (C) 2009 Google 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 are
6  * met:
7  *
8  *     * Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  *     * Redistributions in binary form must reproduce the above
11  * copyright notice, this list of conditions and the following disclaimer
12  * in the documentation and/or other materials provided with the
13  * distribution.
14  *     * Neither the name of Google Inc. nor the names of its
15  * contributors may be used to endorse or promote products derived from
16  * this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 #ifndef WorkerScriptController_h
32 #define WorkerScriptController_h
33 
34 #if ENABLE(WORKERS)
35 
36 #include <wtf/OwnPtr.h>
37 #include <wtf/Threading.h>
38 
39 namespace WebCore {
40 
41     class ScriptSourceCode;
42     class ScriptValue;
43     class WorkerContext;
44     class WorkerContextExecutionProxy;
45 
46     class WorkerScriptController {
47     public:
48         WorkerScriptController(WorkerContext*);
49         ~WorkerScriptController();
50 
proxy()51         WorkerContextExecutionProxy* proxy() { return m_proxy.get(); }
workerContext()52         WorkerContext* workerContext() { return m_workerContext; }
53 
54         ScriptValue evaluate(const ScriptSourceCode&);
55         ScriptValue evaluate(const ScriptSourceCode&, ScriptValue* exception);
56 
57         void setException(ScriptValue);
58 
59         // Async request to terminate a future JS execution. Eventually causes termination
60         // exception raised during JS execution, if the worker thread happens to run JS.
61         // After JS execution was terminated in this way, the Worker thread has to use
62         // forbidExecution()/isExecutionForbidden() to guard against reentry into JS.
63         // Can be called from any thread.
64         void scheduleExecutionTermination();
65 
66         // Called on Worker thread when JS exits with termination exception caused by forbidExecution() request,
67         // or by Worker thread termination code to prevent future entry into JS.
68         void forbidExecution();
69         bool isExecutionForbidden() const;
70 
71         // Returns WorkerScriptController for the currently executing context. 0 will be returned if the current executing context is not the worker context.
72         static WorkerScriptController* controllerForContext();
73 
74     private:
75         WorkerContext* m_workerContext;
76         OwnPtr<WorkerContextExecutionProxy> m_proxy;
77         bool m_executionForbidden;
78     };
79 
80 } // namespace WebCore
81 
82 #endif // ENABLE(WORKERS)
83 
84 #endif // WorkerScriptController_h
85