diff -r 000000000000 -r 4f2f89ce4247 WebCore/dom/ScriptExecutionContext.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/dom/ScriptExecutionContext.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,171 @@
+/*
+ * Copyright (C) 2008 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 ScriptExecutionContext_h
+#define ScriptExecutionContext_h
+
+#include "Console.h"
+#include "KURL.h"
+#include <wtf/HashMap.h>
+#include <wtf/HashSet.h>
+#include <wtf/PassOwnPtr.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefPtr.h>
+#include <wtf/Threading.h>
+
+namespace WebCore {
+
+    class ActiveDOMObject;
+#if ENABLE(DATABASE)
+    class Database;
+    class DatabaseTaskSynchronizer;
+    class DatabaseThread;
+#endif
+    class DOMTimer;
+#if ENABLE(FILE_READER) || ENABLE(FILE_WRITER)
+    class FileThread;
+#endif
+    class MessagePort;
+    class SecurityOrigin;
+    class ScriptString;
+    class String;
+#if ENABLE(INSPECTOR)
+    class InspectorController;
+#endif
+
+    class ScriptExecutionContext {
+    public:
+        ScriptExecutionContext();
+        virtual ~ScriptExecutionContext();
+
+        virtual bool isDocument() const { return false; }
+        virtual bool isWorkerContext() const { return false; }
+
+#if ENABLE(DATABASE)
+        virtual bool isDatabaseReadOnly() const = 0;
+        virtual void databaseExceededQuota(const String& name) = 0;
+        DatabaseThread* databaseThread();
+        void setHasOpenDatabases() { m_hasOpenDatabases = true; }
+        bool hasOpenDatabases() const { return m_hasOpenDatabases; }
+        // When the database cleanup is done, cleanupSync will be signalled.
+        void stopDatabases(DatabaseTaskSynchronizer*);
+#endif
+        virtual bool isContextThread() const = 0;
+        virtual bool isJSExecutionTerminated() const = 0;
+
+        const KURL& url() const { return virtualURL(); }
+        KURL completeURL(const String& url) const { return virtualCompleteURL(url); }
+
+        virtual String userAgent(const KURL&) const = 0;
+
+        SecurityOrigin* securityOrigin() const { return m_securityOrigin.get(); }
+#if ENABLE(INSPECTOR)
+        virtual InspectorController* inspectorController() const { return 0; }
+#endif
+
+        virtual void reportException(const String& errorMessage, int lineNumber, const String& sourceURL) = 0;
+        virtual void addMessage(MessageSource, MessageType, MessageLevel, const String& message, unsigned lineNumber, const String& sourceURL) = 0;
+        
+        // Active objects are not garbage collected even if inaccessible, e.g. because their activity may result in callbacks being invoked.
+        bool canSuspendActiveDOMObjects();
+        // Active objects can be asked to suspend even if canSuspendActiveDOMObjects() returns 'false' -
+        // step-by-step JS debugging is one example.
+        void suspendActiveDOMObjects();
+        void resumeActiveDOMObjects();
+        void stopActiveDOMObjects();
+        void createdActiveDOMObject(ActiveDOMObject*, void* upcastPointer);
+        void destroyedActiveDOMObject(ActiveDOMObject*);
+        typedef const HashMap<ActiveDOMObject*, void*> ActiveDOMObjectsMap;
+        ActiveDOMObjectsMap& activeDOMObjects() const { return m_activeDOMObjects; }
+
+        // MessagePort is conceptually a kind of ActiveDOMObject, but it needs to be tracked separately for message dispatch.
+        void processMessagePortMessagesSoon();
+        void dispatchMessagePortEvents();
+        void createdMessagePort(MessagePort*);
+        void destroyedMessagePort(MessagePort*);
+        const HashSet<MessagePort*>& messagePorts() const { return m_messagePorts; }
+
+        void ref() { refScriptExecutionContext(); }
+        void deref() { derefScriptExecutionContext(); }
+
+        class Task : public Noncopyable {
+        public:
+            virtual ~Task();
+            virtual void performTask(ScriptExecutionContext*) = 0;
+            // Certain tasks get marked specially so that they aren't discarded, and are executed, when the context is shutting down its message queue.
+            virtual bool isCleanupTask() const { return false; }
+        };
+
+        virtual void postTask(PassOwnPtr<Task>) = 0; // Executes the task on context's thread asynchronously.
+
+        void addTimeout(int timeoutId, DOMTimer*);
+        void removeTimeout(int timeoutId);
+        DOMTimer* findTimeout(int timeoutId);
+
+#if USE(JSC)
+        JSC::JSGlobalData* globalData();
+#endif
+
+#if ENABLE(FILE_READER) || ENABLE(FILE_WRITER)
+        FileThread* fileThread();
+        void stopFileThread();
+#endif
+
+    protected:
+        // Explicitly override the security origin for this script context.
+        // Note: It is dangerous to change the security origin of a script context
+        //       that already contains content.
+        void setSecurityOrigin(PassRefPtr<SecurityOrigin>);
+
+    private:
+        virtual const KURL& virtualURL() const = 0;
+        virtual KURL virtualCompleteURL(const String&) const = 0;
+
+        RefPtr<SecurityOrigin> m_securityOrigin;
+
+        HashSet<MessagePort*> m_messagePorts;
+
+        HashMap<ActiveDOMObject*, void*> m_activeDOMObjects;
+
+        HashMap<int, DOMTimer*> m_timeouts;
+
+        virtual void refScriptExecutionContext() = 0;
+        virtual void derefScriptExecutionContext() = 0;
+
+#if ENABLE(DATABASE)
+        RefPtr<DatabaseThread> m_databaseThread;
+        bool m_hasOpenDatabases; // This never changes back to false, even after the database thread is closed.
+#endif
+
+#if ENABLE(FILE_READER) || ENABLE(FILE_WRITER)
+        RefPtr<FileThread> m_fileThread;
+#endif
+    };
+
+} // namespace WebCore
+
+
+#endif // ScriptExecutionContext_h