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      1 /*
      2  * Copyright (C) 2010 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
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef JSMainThreadExecState_h
     27 #define JSMainThreadExecState_h
     28 
     29 #include "JSDOMBinding.h"
     30 #ifndef NDEBUG
     31 #include <wtf/MainThread.h>
     32 #endif
     33 
     34 namespace WebCore {
     35 
     36 class JSMainThreadExecState {
     37     WTF_MAKE_NONCOPYABLE(JSMainThreadExecState);
     38 public:
     39     static JSC::ExecState* currentState()
     40     {
     41         ASSERT(WTF::isMainThread());
     42         return s_mainThreadState;
     43     };
     44 
     45     static JSC::JSValue call(JSC::ExecState* exec, JSC::JSValue functionObject, JSC::CallType callType, const JSC::CallData& callData, JSC::JSValue thisValue, const JSC::ArgList& args)
     46     {
     47         JSMainThreadExecState currentState(exec);
     48         return JSC::call(exec, functionObject, callType, callData, thisValue, args);
     49     };
     50 
     51     static JSC::Completion evaluate(JSC::ExecState* exec, JSC::ScopeChainNode* chain, const JSC::SourceCode& source, JSC::JSValue thisValue)
     52     {
     53         JSMainThreadExecState currentState(exec);
     54         return JSC::evaluate(exec, chain, source, thisValue);
     55     };
     56 
     57 protected:
     58     explicit JSMainThreadExecState(JSC::ExecState* exec)
     59         : m_previousState(s_mainThreadState)
     60     {
     61         ASSERT(WTF::isMainThread());
     62         s_mainThreadState = exec;
     63     };
     64 
     65     ~JSMainThreadExecState()
     66     {
     67         ASSERT(WTF::isMainThread());
     68         s_mainThreadState = m_previousState;
     69     }
     70 
     71 private:
     72     static JSC::ExecState* s_mainThreadState;
     73     JSC::ExecState* m_previousState;
     74 };
     75 
     76 // Null state prevents origin security checks.
     77 class JSMainThreadNullState : private JSMainThreadExecState {
     78 public:
     79     explicit JSMainThreadNullState() : JSMainThreadExecState(0) {};
     80 };
     81 
     82 } // namespace WebCore
     83 
     84 #endif // JSMainThreadExecState_h
     85