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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 
32 #ifndef WorkerContextExecutionProxy_h
33 #define WorkerContextExecutionProxy_h
34 
35 #if ENABLE(WORKERS)
36 
37 #include "ScriptValue.h"
38 #include <v8.h>
39 #include <wtf/text/TextPosition.h>
40 #include <wtf/OwnPtr.h>
41 #include <wtf/Vector.h>
42 
43 namespace WebCore {
44 
45     class Event;
46     class EventTarget;
47     class WorkerContext;
48 
49     struct WorkerContextExecutionState {
WorkerContextExecutionStateWorkerContextExecutionState50         WorkerContextExecutionState() : hadException(false), lineNumber(0) { }
51 
52         bool hadException;
53         ScriptValue exception;
54         String errorMessage;
55         int lineNumber;
56         String sourceURL;
57     };
58 
59     class WorkerContextExecutionProxy {
60     public:
61         WorkerContextExecutionProxy(WorkerContext*);
62         ~WorkerContextExecutionProxy();
63 
64         // Track the event so that we can detach it from the JS wrapper when a worker
65         // terminates. This is needed because we need to be able to dispose these
66         // events and releases references to their event targets: WorkerContext.
67         void trackEvent(Event*);
68 
69         // Evaluate a script file in the current execution environment.
70         ScriptValue evaluate(const String& script, const String& fileName, const TextPosition0& scriptStartPosition, WorkerContextExecutionState*);
71 
72         // Returns a local handle of the context.
context()73         v8::Local<v8::Context> context() { return v8::Local<v8::Context>::New(m_context); }
74 
75     private:
76         void initV8IfNeeded();
77         bool initContextIfNeeded();
78         void dispose();
79 
80         // Run an already compiled script.
81         v8::Local<v8::Value> runScript(v8::Handle<v8::Script>);
82 
83         static bool forgetV8EventObject(Event*);
84 
85         static const int kWorkerMaxStackSize = 500 * 1024;
86 
87         WorkerContext* m_workerContext;
88         v8::Persistent<v8::Context> m_context;
89         int m_recursion;
90 
91         Vector<Event*> m_events;
92     };
93 
94 } // namespace WebCore
95 
96 #endif // ENABLE(WORKERS)
97 
98 #endif // WorkerContextExecutionProxy_h
99