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/core/v8/ScriptValue.h" 35 #include "bindings/core/v8/V8Binding.h" 36 #include "wtf/OwnPtr.h" 37 #include "wtf/ThreadingPrimitives.h" 38 #include "wtf/text/TextPosition.h" 39 #include <v8.h> 40 41 namespace blink { 42 43 class ErrorEvent; 44 class ExceptionState; 45 class ScriptSourceCode; 46 class WorkerGlobalScope; 47 48 class WorkerScriptController { 49 public: 50 explicit WorkerScriptController(WorkerGlobalScope&); 51 ~WorkerScriptController(); 52 53 bool isExecutionForbidden() const; 54 bool isExecutionTerminating() const; 55 void evaluate(const ScriptSourceCode&, RefPtrWillBeRawPtr<ErrorEvent>* = 0); 56 57 // Prevents future JavaScript execution. See 58 // scheduleExecutionTermination, isExecutionForbidden. 59 void forbidExecution(); 60 61 // Used by WorkerThread: 62 bool initializeContextIfNeeded(); 63 // Async request to terminate future JavaScript execution on the 64 // worker thread. JavaScript evaluation exits with a 65 // non-continuable exception and WorkerScriptController calls 66 // forbidExecution to prevent further JavaScript execution. Use 67 // forbidExecution()/isExecutionForbidden() to guard against 68 // reentry into JavaScript. 69 void scheduleExecutionTermination(); 70 71 // Used by WorkerGlobalScope: 72 void rethrowExceptionFromImportedScript(PassRefPtrWillBeRawPtr<ErrorEvent>, ExceptionState&); 73 void disableEval(const String&); 74 // Send a notification about current thread is going to be idle. 75 // Returns true if the embedder should stop calling idleNotification 76 // until real work has been done. idleNotification()77 bool idleNotification() { return m_isolate->IdleNotification(1000); } 78 79 // Used by Inspector agents: scriptState()80 ScriptState* scriptState() { return m_scriptState.get(); } 81 82 // Used by V8 bindings: context()83 v8::Local<v8::Context> context() { return m_scriptState ? m_scriptState->context() : v8::Local<v8::Context>(); } 84 85 private: 86 class WorkerGlobalScopeExecutionState; 87 isContextInitialized()88 bool isContextInitialized() { return m_scriptState && !!m_scriptState->perContextData(); } 89 90 // Evaluate a script file in the current execution environment. 91 ScriptValue evaluate(const String& script, const String& fileName, const TextPosition& scriptStartPosition); 92 93 v8::Isolate* m_isolate; 94 WorkerGlobalScope& m_workerGlobalScope; 95 RefPtr<ScriptState> m_scriptState; 96 RefPtr<DOMWrapperWorld> m_world; 97 String m_disableEvalPending; 98 bool m_executionForbidden; 99 bool m_executionScheduledToTerminate; 100 mutable Mutex m_scheduledTerminationMutex; 101 102 // |m_globalScopeExecutionState| refers to a stack object 103 // that evaluate() allocates; evaluate() ensuring that the 104 // pointer reference to it is removed upon returning. Hence 105 // kept as a bare pointer here, and not a Persistent with 106 // Oilpan enabled; stack scanning will visit the object and 107 // trace its on-heap fields. 108 GC_PLUGIN_IGNORE("394615") 109 WorkerGlobalScopeExecutionState* m_globalScopeExecutionState; 110 OwnPtr<V8IsolateInterruptor> m_interruptor; 111 }; 112 113 } // namespace blink 114 115 #endif // WorkerScriptController_h 116