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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef V8IsolatedWorld_h
#define V8IsolatedWorld_h
#include <v8.h>
#include "V8DOMMap.h"
#include "V8Index.h"
#include "V8Utilities.h"
#include "ScriptSourceCode.h" // for WebCore::ScriptSourceCode
namespace WebCore {
class V8Proxy;
// V8IsolatedWorld
//
// V8IsolatedWorld represents a isolated execution environment for
// JavaScript. Each isolated world executes in parallel with the main
// JavaScript world. An isolated world has access to the same DOM data
// structures as the main world but none of the JavaScript pointers.
//
// It is an error to ever share a JavaScript pointer between two isolated
// worlds or between an isolated world and the main world. Because
// isolated worlds have access to the DOM, they need their own DOM wrappers
// to avoid having pointers to the main world's DOM wrappers (which are
// JavaScript objects).
//
class V8IsolatedWorld {
public:
~V8IsolatedWorld();
// Evaluate JavaScript in a new isolated world. The script has access
// to the DOM of the document associated with |proxy|.
static void evaluate(const Vector<ScriptSourceCode>& sources, V8Proxy* proxy);
// Returns the isolated world associated with
// v8::Context::GetEntered(). Because worlds are isolated, the entire
// JavaScript call stack should be from the same isolated world.
// Returns NULL if the entered context is from the main world.
//
// FIXME: Consider edge cases with DOM mutation events that might
// violate this invariant.
//
static V8IsolatedWorld* getEntered();
DOMDataStore* getDOMDataStore() const { return m_domDataStore.getStore(); }
private:
// The lifetime of an isolated world is managed by the V8 garbage
// collector. In particular, the object created by this constructor is
// freed when |context| is garbage collected.
explicit V8IsolatedWorld(v8::Handle<v8::Context> context);
// The v8::Context for the isolated world. This object is keep on the
// heap as long as |m_context| has not been garbage collected.
v8::Persistent<v8::Context> m_context;
// The backing store for the isolated world's DOM wrappers. This class
// doesn't have visibility into the wrappers. This handle simply helps
// manage their lifetime.
DOMDataStoreHandle m_domDataStore;
};
} // namespace WebCore
#endif // V8IsolatedWorld_h