| /* |
| * 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, |
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| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| * 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 "V8Index.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 |