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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 V8IsolatedContext_h
#define V8IsolatedContext_h
#include "IsolatedWorld.h"
#include "ScriptSourceCode.h" // for WebCore::ScriptSourceCode
#include "V8DOMWindow.h"
#include "V8Proxy.h"
#include "V8Utilities.h"
#include <v8.h>
namespace WebCore {
class V8Proxy;
// V8IsolatedContext
//
// V8IsolatedContext 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 V8IsolatedContext {
public:
// Creates an isolated world. To destroy it, call destroy().
// This will delete the isolated world when the context it owns is GC'd.
V8IsolatedContext(V8Proxy* proxy, int extensionGroup);
~V8IsolatedContext();
// Call this to destroy the isolated world. It will be deleted sometime
// after this call, once all script references to the world's context
// have been dropped.
void destroy();
// 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 0 if the entered context is from the main world.
//
// FIXME: Consider edge cases with DOM mutation events that might
// violate this invariant.
//
static V8IsolatedContext* getEntered()
{
// This is a temporary performance optimization. Essentially,
// GetHiddenValue is too slow for this code path. We need to get the
// V8 team to add a real property to v8::Context for isolated worlds.
// Until then, we optimize the common case of not having any isolated
// worlds at all.
if (!IsolatedWorld::count())
return 0;
if (!v8::Context::InContext())
return 0;
return reinterpret_cast<V8IsolatedContext*>(getGlobalObject(v8::Context::GetEntered())->GetPointerFromInternalField(V8DOMWindow::enteredIsolatedWorldIndex));
}
v8::Handle<v8::Context> context() { return m_context->get(); }
PassRefPtr<SharedPersistent<v8::Context> > sharedContext() { return m_context; }
IsolatedWorld* world() const { return m_world.get(); }
private:
static v8::Handle<v8::Object> getGlobalObject(v8::Handle<v8::Context> context)
{
return v8::Handle<v8::Object>::Cast(context->Global()->GetPrototype());
}
// Called by the garbage collector when our JavaScript context is about
// to be destroyed.
static void contextWeakReferenceCallback(v8::Persistent<v8::Value> object, void* isolatedContext);
// The underlying v8::Context. This object is keep on the heap as
// long as |m_context| has not been garbage collected.
RefPtr<SharedPersistent<v8::Context> > m_context;
RefPtr<IsolatedWorld> m_world;
};
} // namespace WebCore
#endif // V8IsolatedContext_h
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