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 "gin/public/context_holder.h" 38 #include "gin/public/isolate_holder.h" 39 #include "wtf/OwnPtr.h" 40 #include "wtf/ThreadingPrimitives.h" 41 #include "wtf/text/TextPosition.h" 42 #include <v8.h> 43 44 namespace gin { 45 class IsolateHolder; 46 } 47 48 namespace WebCore { 49 50 class ScriptSourceCode; 51 class ScriptValue; 52 class WorkerGlobalScope; 53 54 struct WorkerGlobalScopeExecutionState { WorkerGlobalScopeExecutionStateWorkerGlobalScopeExecutionState55 WorkerGlobalScopeExecutionState() 56 : hadException(false) 57 , lineNumber(0) 58 , columnNumber(0) 59 { 60 } 61 62 bool hadException; 63 String errorMessage; 64 int lineNumber; 65 int columnNumber; 66 String sourceURL; 67 ScriptValue exception; 68 }; 69 70 class WorkerScriptController { 71 public: 72 explicit WorkerScriptController(WorkerGlobalScope&); 73 ~WorkerScriptController(); 74 workerGlobalScope()75 WorkerGlobalScope& workerGlobalScope() { return m_workerGlobalScope; } 76 77 void evaluate(const ScriptSourceCode&, RefPtr<ErrorEvent>* = 0); 78 79 void rethrowExceptionFromImportedScript(PassRefPtr<ErrorEvent>); 80 81 // Async request to terminate a future JS execution. Eventually causes termination 82 // exception raised during JS execution, if the worker thread happens to run JS. 83 // After JS execution was terminated in this way, the Worker thread has to use 84 // forbidExecution()/isExecutionForbidden() to guard against reentry into JS. 85 // Can be called from any thread. 86 void scheduleExecutionTermination(); 87 bool isExecutionTerminating() const; 88 89 // Called on Worker thread when JS exits with termination exception caused by forbidExecution() request, 90 // or by Worker thread termination code to prevent future entry into JS. 91 void forbidExecution(); 92 bool isExecutionForbidden() const; 93 94 void disableEval(const String&); 95 96 // Returns WorkerScriptController for the currently executing context. 0 will be returned if the current executing context is not the worker context. 97 static WorkerScriptController* controllerForContext(); 98 99 // Evaluate a script file in the current execution environment. 100 ScriptValue evaluate(const String& script, const String& fileName, const TextPosition& scriptStartPosition, WorkerGlobalScopeExecutionState*); 101 102 // Returns a local handle of the context. context()103 v8::Local<v8::Context> context() { return m_contextHolder ? m_contextHolder->context() : v8::Local<v8::Context>(); } 104 105 // Send a notification about current thread is going to be idle. 106 // Returns true if the embedder should stop calling idleNotification 107 // until real work has been done. idleNotification()108 bool idleNotification() { return v8::V8::IdleNotification(); } 109 isolate()110 v8::Isolate* isolate() const { return m_isolateHolder->isolate(); } 111 112 private: 113 bool initializeContextIfNeeded(); 114 void disposeContext(); 115 116 WorkerGlobalScope& m_workerGlobalScope; 117 OwnPtr<gin::IsolateHolder> m_isolateHolder; 118 OwnPtr<gin::ContextHolder> m_contextHolder; 119 OwnPtr<V8PerContextData> m_perContextData; 120 String m_disableEvalPending; 121 OwnPtr<DOMDataStore> m_domDataStore; 122 bool m_executionForbidden; 123 bool m_executionScheduledToTerminate; 124 mutable Mutex m_scheduledTerminationMutex; 125 RefPtr<ErrorEvent> m_errorEventFromImportedScript; 126 }; 127 128 } // namespace WebCore 129 130 #endif // WorkerScriptController_h 131