Home | History | Annotate | Download | only in v8 
      1 /*
      2  * Copyright (C) 2009, 2012 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 #include "bindings/v8/ScriptValue.h"
     35 #include "bindings/v8/V8Binding.h"
     36 #include "core/events/ErrorEvent.h"
     37 #include "wtf/OwnPtr.h"
     38 #include "wtf/ThreadingPrimitives.h"
     39 #include "wtf/text/TextPosition.h"
     40 #include <v8.h>
     41 
     42 namespace WebCore {
     43 
     44     class ScriptSourceCode;
     45     class ScriptValue;
     46     class WorkerGlobalScope;
     47 
     48     struct WorkerGlobalScopeExecutionState {
     49         WorkerGlobalScopeExecutionState()
     50             : hadException(false)
     51             , lineNumber(0)
     52             , columnNumber(0)
     53         {
     54         }
     55 
     56         bool hadException;
     57         String errorMessage;
     58         int lineNumber;
     59         int columnNumber;
     60         String sourceURL;
     61         ScriptValue exception;
     62     };
     63 
     64     class WorkerScriptController {
     65     public:
     66         explicit WorkerScriptController(WorkerGlobalScope&);
     67         ~WorkerScriptController();
     68 
     69         WorkerGlobalScope& workerGlobalScope() { return m_workerGlobalScope; }
     70 
     71         bool initializeContextIfNeeded();
     72 
     73         void evaluate(const ScriptSourceCode&, RefPtrWillBeRawPtr<ErrorEvent>* = 0);
     74 
     75         void rethrowExceptionFromImportedScript(PassRefPtrWillBeRawPtr<ErrorEvent>);
     76 
     77         // Async request to terminate a future JS execution. Eventually causes termination
     78         // exception raised during JS execution, if the worker thread happens to run JS.
     79         // After JS execution was terminated in this way, the Worker thread has to use
     80         // forbidExecution()/isExecutionForbidden() to guard against reentry into JS.
     81         // Can be called from any thread.
     82         void scheduleExecutionTermination();
     83         bool isExecutionTerminating() const;
     84 
     85         // Called on Worker thread when JS exits with termination exception caused by forbidExecution() request,
     86         // or by Worker thread termination code to prevent future entry into JS.
     87         void forbidExecution();
     88         bool isExecutionForbidden() const;
     89 
     90         void disableEval(const String&);
     91 
     92         // Evaluate a script file in the current execution environment.
     93         ScriptValue evaluate(const String& script, const String& fileName, const TextPosition& scriptStartPosition, WorkerGlobalScopeExecutionState*);
     94 
     95         v8::Isolate* isolate() const { return m_isolate; }
     96         DOMWrapperWorld& world() const { return *m_world; }
     97         ScriptState* scriptState() { return m_scriptState.get(); }
     98         v8::Local<v8::Context> context() { return m_scriptState ? m_scriptState->context() : v8::Local<v8::Context>(); }
     99         bool isContextInitialized() { return m_scriptState && !!m_scriptState->perContextData(); }
    100 
    101         // Send a notification about current thread is going to be idle.
    102         // Returns true if the embedder should stop calling idleNotification
    103         // until real work has been done.
    104         bool idleNotification() { return v8::V8::IdleNotification(); }
    105 
    106 
    107     private:
    108         v8::Isolate* m_isolate;
    109         WorkerGlobalScope& m_workerGlobalScope;
    110         RefPtr<ScriptState> m_scriptState;
    111         RefPtr<DOMWrapperWorld> m_world;
    112         String m_disableEvalPending;
    113         bool m_executionForbidden;
    114         bool m_executionScheduledToTerminate;
    115         mutable Mutex m_scheduledTerminationMutex;
    116         RefPtrWillBePersistent<ErrorEvent> m_errorEventFromImportedScript;
    117         OwnPtr<V8IsolateInterruptor> m_interruptor;
    118     };
    119 
    120 } // namespace WebCore
    121 
    122 #endif // WorkerScriptController_h
    123