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      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.
     77     bool idleNotification() { return m_isolate->IdleNotification(1000); }
     78 
     79     // Used by Inspector agents:
     80     ScriptState* scriptState() { return m_scriptState.get(); }
     81 
     82     // Used by V8 bindings:
     83     v8::Local<v8::Context> context() { return m_scriptState ? m_scriptState->context() : v8::Local<v8::Context>(); }
     84 
     85 private:
     86     class WorkerGlobalScopeExecutionState;
     87 
     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