JavaScriptCore-1097.3.tar.gz

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

diff --git a/heap/MarkedBlockSet.h b/heap/MarkedBlockSet.h
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+/*
+ * 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 MarkedBlockSet_h
+#define MarkedBlockSet_h
+
+#include "MarkedBlock.h"
+#include "TinyBloomFilter.h"
+#include <wtf/HashSet.h>
+
+namespace JSC {
+
+class MarkedBlock;
+
+class MarkedBlockSet {
+public:
+    void add(MarkedBlock*);
+    void remove(MarkedBlock*);
+
+    TinyBloomFilter filter() const;
+    const HashSet<MarkedBlock*>& set() const;
+
+private:
+    void recomputeFilter();
+
+    TinyBloomFilter m_filter;
+    HashSet<MarkedBlock*> m_set;
+};
+
+inline void MarkedBlockSet::add(MarkedBlock* block)
+{
+    m_filter.add(reinterpret_cast<Bits>(block));
+    m_set.add(block);
+}
+
+inline void MarkedBlockSet::remove(MarkedBlock* block)
+{
+    int oldCapacity = m_set.capacity();
+    m_set.remove(block);
+    if (m_set.capacity() != oldCapacity) // Indicates we've removed a lot of blocks.
+        recomputeFilter();
+}
+
+inline void MarkedBlockSet::recomputeFilter()
+{
+    TinyBloomFilter filter;
+    for (HashSet<MarkedBlock*>::iterator it = m_set.begin(); it != m_set.end(); ++it)
+        filter.add(reinterpret_cast<Bits>(*it));
+    m_filter = filter;
+}
+
+inline TinyBloomFilter MarkedBlockSet::filter() const
+{
+    return m_filter;
+}
+
+inline const HashSet<MarkedBlock*>& MarkedBlockSet::set() const
+{
+    return m_set;
+}
+
+} // namespace JSC
+
+#endif // MarkedBlockSet_h