JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / runtime / StorageBarrier.h

diff --git a/runtime/StorageBarrier.h b/runtime/StorageBarrier.h
new file mode 100644 (file)
index 0000000..2a0c842
--- /dev/null
+++ b/runtime/StorageBarrier.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2011 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 INC. AND ITS 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 APPLE INC. OR ITS 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 StorageBarrier_h
+#define StorageBarrier_h
+
+#include "JSGlobalData.h"
+#include "WriteBarrier.h"
+
+namespace JSC {
+
+typedef WriteBarrierBase<Unknown>* PropertyStorage;
+typedef const WriteBarrierBase<Unknown>* ConstPropertyStorage;
+
+class StorageBarrier {
+public:
+    enum UncheckedTag { Unchecked };
+    StorageBarrier(JSGlobalData& globalData, JSCell* owner, PropertyStorage storage)
+    {
+        set(globalData, owner, storage);
+    }
+    
+    StorageBarrier(PropertyStorage storage, UncheckedTag)
+    {
+        set(storage, Unchecked);
+    }
+    
+    void set(JSGlobalData&, JSCell*, PropertyStorage newStorage)
+    {
+        m_storage = newStorage;
+    }
+    
+    void set(PropertyStorage newStorage, UncheckedTag)
+    {
+        m_storage = newStorage;
+    }
+    
+    WriteBarrierBase<Unknown>* operator->() const { return m_storage; }
+    WriteBarrierBase<Unknown>* operator->() { return m_storage; }
+    WriteBarrierBase<Unknown> operator*() const { return *m_storage; }
+    WriteBarrierBase<Unknown> operator*() { return *m_storage; }
+    const WriteBarrierBase<Unknown>& operator[](size_t i) const { return m_storage[i]; }
+    WriteBarrierBase<Unknown>& operator[](size_t i) { return m_storage[i]; }
+    
+    ConstPropertyStorage get() const { return m_storage; }
+    PropertyStorage get() { return m_storage; }
+    
+private:
+    PropertyStorage m_storage;
+};
+
+}
+
+#endif