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/*
* Copyright (C) 2009, 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef WorkerScriptController_h
#define WorkerScriptController_h
#include "bindings/v8/ScriptValue.h"
#include "bindings/v8/V8Binding.h"
#include "core/dom/ErrorEvent.h"
#include "wtf/OwnPtr.h"
#include "wtf/Threading.h"
#include "wtf/text/TextPosition.h"
#include <v8.h>
namespace WebCore {
class ScriptSourceCode;
class ScriptValue;
class WorkerGlobalScope;
struct WorkerGlobalScopeExecutionState {
WorkerGlobalScopeExecutionState()
: hadException(false)
, lineNumber(0)
, columnNumber(0)
{
}
bool hadException;
String errorMessage;
int lineNumber;
int columnNumber;
String sourceURL;
ScriptValue exception;
};
class WorkerScriptController {
public:
WorkerScriptController(WorkerGlobalScope*);
~WorkerScriptController();
WorkerGlobalScope* workerGlobalScope() { return m_workerGlobalScope; }
void evaluate(const ScriptSourceCode&, RefPtr<ErrorEvent>* = 0);
void rethrowExceptionFromImportedScript(PassRefPtr<ErrorEvent>);
// Async request to terminate a future JS execution. Eventually causes termination
// exception raised during JS execution, if the worker thread happens to run JS.
// After JS execution was terminated in this way, the Worker thread has to use
// forbidExecution()/isExecutionForbidden() to guard against reentry into JS.
// Can be called from any thread.
void scheduleExecutionTermination();
bool isExecutionTerminating() const;
// Called on Worker thread when JS exits with termination exception caused by forbidExecution() request,
// or by Worker thread termination code to prevent future entry into JS.
void forbidExecution();
bool isExecutionForbidden() const;
void disableEval(const String&);
// Returns WorkerScriptController for the currently executing context. 0 will be returned if the current executing context is not the worker context.
static WorkerScriptController* controllerForContext();
// Evaluate a script file in the current execution environment.
ScriptValue evaluate(const String& script, const String& fileName, const TextPosition& scriptStartPosition, WorkerGlobalScopeExecutionState*);
// Returns a local handle of the context.
v8::Local<v8::Context> context() { return m_context.newLocal(v8::Isolate::GetCurrent()); }
// Send a notification about current thread is going to be idle.
// Returns true if the embedder should stop calling idleNotification
// until real work has been done.
bool idleNotification() { return v8::V8::IdleNotification(); }
private:
bool initializeContextIfNeeded();
void disposeContext();
WorkerGlobalScope* m_workerGlobalScope;
v8::Isolate* m_isolate;
ScopedPersistent<v8::Context> m_context;
OwnPtr<V8PerContextData> m_perContextData;
String m_disableEvalPending;
OwnPtr<DOMDataStore> m_domDataStore;
bool m_executionForbidden;
bool m_executionScheduledToTerminate;
mutable Mutex m_scheduledTerminationMutex;
RefPtr<ErrorEvent> m_errorEventFromImportedScript;
};
} // namespace WebCore
#endif // WorkerScriptController_h