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      1 /*
      2  * Copyright (c) 2008, 2011 Google Inc.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  *     * Redistributions of source code must retain the above copyright
     10  * notice, this list of conditions and the following disclaimer.
     11  *     * Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *     * Neither the name of Google Inc. nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef ScriptState_h
     33 #define ScriptState_h
     34 
     35 #include <heap/Strong.h>
     36 #include <wtf/Noncopyable.h>
     37 
     38 namespace JSC {
     39 class ExecState;
     40 class JSGlobalObject;
     41 }
     42 
     43 namespace WebCore {
     44 class DOMWrapperWorld;
     45 class Frame;
     46 class Node;
     47 class Page;
     48 class WorkerContext;
     49 
     50 // The idea is to expose "state-like" methods (hadException, and any other
     51 // methods where ExecState just dips into globalData) of JSC::ExecState as a
     52 // separate abstraction.
     53 // For now, the separation is purely by convention.
     54 typedef JSC::ExecState ScriptState;
     55 
     56 class ScriptStateProtectedPtr {
     57     WTF_MAKE_NONCOPYABLE(ScriptStateProtectedPtr);
     58 public:
     59     explicit ScriptStateProtectedPtr(ScriptState*);
     60     ~ScriptStateProtectedPtr();
     61     ScriptState* get() const;
     62 private:
     63     JSC::Strong<JSC::JSGlobalObject> m_globalObject;
     64 };
     65 
     66 ScriptState* mainWorldScriptState(Frame*);
     67 
     68 ScriptState* scriptStateFromNode(DOMWrapperWorld*, Node*);
     69 ScriptState* scriptStateFromPage(DOMWrapperWorld*, Page*);
     70 
     71 #if ENABLE(WORKERS)
     72 ScriptState* scriptStateFromWorkerContext(WorkerContext*);
     73 #endif
     74 
     75 } // namespace WebCore
     76 
     77 #endif // ScriptState_h
     78