JavaScriptCore-1218.tar.gz

[apple/javascriptcore.git] / heap / SuperRegion.h

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+/*
+ * Copyright (C) 2013 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 SuperRegion_h
+#define SuperRegion_h
+
+#include <wtf/MetaAllocator.h>
+#include <wtf/PageBlock.h>
+#include <wtf/PageReservation.h>
+
+namespace JSC {
+
+class VM;
+
+class SuperRegion : public WTF::MetaAllocator {
+public:
+    SuperRegion();
+    virtual ~SuperRegion();
+
+protected:
+    virtual void* allocateNewSpace(size_t&);
+    virtual void notifyNeedPage(void*);
+    virtual void notifyPageIsFree(void*);
+
+private:
+    static const uint64_t s_fixedHeapMemoryPoolSize;
+
+    static void* getAlignedBase(PageReservation&);
+
+    PageReservation m_reservation;
+    void* m_reservationBase;
+};
+
+} // namespace JSC
+
+#endif // SuperRegion_h