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      1 /*
      2  * Copyright (C) 2008, 2009, 2011 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 ScriptState_h
     32 #define ScriptState_h
     33 
     34 #include "bindings/v8/ScopedPersistent.h"
     35 #include "bindings/v8/V8Utilities.h"
     36 #include <v8.h>
     37 #include "wtf/Noncopyable.h"
     38 
     39 namespace WebCore {
     40 
     41 class DOMWindow;
     42 class DOMWrapperWorld;
     43 class Frame;
     44 class ScriptExecutionContext;
     45 class WorkerGlobalScope;
     46 
     47 class ScriptState {
     48     WTF_MAKE_NONCOPYABLE(ScriptState);
     49 public:
     50     bool hadException() { return !m_exception.isEmpty(); }
     51     void setException(v8::Local<v8::Value> exception)
     52     {
     53         m_exception.set(m_isolate, exception);
     54     }
     55     v8::Local<v8::Value> exception() { return m_exception.newLocal(m_isolate); }
     56     void clearException() { m_exception.clear(); }
     57 
     58     v8::Local<v8::Context> context() const
     59     {
     60         return m_context.newLocal(m_isolate);
     61     }
     62 
     63     v8::Isolate* isolate()
     64     {
     65         return m_isolate;
     66     }
     67 
     68     DOMWindow* domWindow() const;
     69     ScriptExecutionContext* scriptExecutionContext() const;
     70     bool evalEnabled() const;
     71     void setEvalEnabled(bool);
     72 
     73     static ScriptState* forContext(v8::Handle<v8::Context>);
     74     static ScriptState* current();
     75 
     76 protected:
     77     ScriptState()
     78         : m_isolate(v8::Isolate::GetCurrent())
     79     {
     80     }
     81 
     82     ~ScriptState();
     83 
     84 private:
     85     friend ScriptState* mainWorldScriptState(Frame*);
     86     explicit ScriptState(v8::Handle<v8::Context>);
     87 
     88     static void makeWeakCallback(v8::Isolate*, v8::Persistent<v8::Context>*, ScriptState*);
     89 
     90     ScopedPersistent<v8::Value> m_exception;
     91     ScopedPersistent<v8::Context> m_context;
     92     v8::Isolate* m_isolate;
     93 };
     94 
     95 class EmptyScriptState : public ScriptState {
     96 public:
     97     EmptyScriptState() : ScriptState() { }
     98     ~EmptyScriptState() { }
     99 };
    100 
    101 class ScriptStateProtectedPtr {
    102     WTF_MAKE_NONCOPYABLE(ScriptStateProtectedPtr);
    103 public:
    104     ScriptStateProtectedPtr()
    105         : m_scriptState(0)
    106     {
    107     }
    108 
    109     ScriptStateProtectedPtr(ScriptState* scriptState)
    110         : m_scriptState(scriptState)
    111     {
    112         v8::HandleScope handleScope;
    113         // Keep the context from being GC'ed. ScriptState is guaranteed to be live while the context is live.
    114         m_context.set(scriptState->isolate(), scriptState->context());
    115     }
    116 
    117     ScriptState* get() const { return m_scriptState; }
    118 
    119 private:
    120     ScriptState* m_scriptState;
    121     ScopedPersistent<v8::Context> m_context;
    122 };
    123 
    124 ScriptState* mainWorldScriptState(Frame*);
    125 
    126 ScriptState* scriptStateFromWorkerGlobalScope(WorkerGlobalScope*);
    127 
    128 }
    129 
    130 #endif // ScriptState_h
    131