Dart bindings for WebKit

Source/WebCore/bindings/dart/DartIsolateState.h

+// Copyright 2011, 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 DartIsolateState_h
+#define DartIsolateState_h
+
+#include <dart_api.h>
+
+namespace WebCore {
+
+struct DartIsolateLink;
+class ScriptExecutionContext;
+
+// This class manages Dart isolate state for this renderer process. It maintains a stack of
+// isolates that are currently active on the main thread's stack frame.
+class DartIsolateState {
+public:
+    // Creates a new isolate and sets it as the current.
+    static Dart_Isolate create(ScriptExecutionContext*, void*);
+
+    // Pushes the given isolate as the current one.
+    static void push(Dart_Isolate);
+
+    // Returns the currently active isolate.
+    static Dart_Isolate current();
+
+    // Pops the currently active isolate and restores the previous one (if any).
+    // Fails if no current isolate.
+    static void pop();
+
+    // Shutdowns the given isolate.
+    static void shutdown(Dart_Isolate);
+
+    class Scope {
+    public:
+        explicit Scope(Dart_Isolate isolate) { push(isolate); }
+        ~Scope() { pop(); }
+    };
+
+private:
+    static void pushLink(Dart_Isolate);
+    static void popLink();
+
+    static DartIsolateLink* m_current;
+};
+
+}
+
+#endif // DartIsolateState_h