--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/memory/freeBlockDictionary.hpp	Thu Mar 29 19:46:24 2012 -0700
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_MEMORY_FREEBLOCKDICTIONARY_HPP
+#define SHARE_VM_MEMORY_FREEBLOCKDICTIONARY_HPP
+
+#include "memory/allocation.hpp"
+#include "runtime/mutex.hpp"
+#include "utilities/debug.hpp"
+#include "utilities/globalDefinitions.hpp"
+#include "utilities/ostream.hpp"
+
+// A FreeBlockDictionary is an abstract superclass that will allow
+// a number of alternative implementations in the future.
+template <class Chunk>
+class FreeBlockDictionary: public CHeapObj {
+ public:
+  enum Dither {
+    atLeast,
+    exactly,
+    roughly
+  };
+  enum DictionaryChoice {
+    dictionaryBinaryTree = 0,
+    dictionarySplayTree  = 1,
+    dictionarySkipList   = 2
+  };
+
+ private:
+  NOT_PRODUCT(Mutex* _lock;)
+
+ public:
+  virtual void       removeChunk(Chunk* fc) = 0;
+  virtual Chunk*     getChunk(size_t size, Dither dither = atLeast) = 0;
+  virtual void       returnChunk(Chunk* chunk) = 0;
+  virtual size_t     totalChunkSize(debug_only(const Mutex* lock)) const = 0;
+  virtual size_t     maxChunkSize()   const = 0;
+  virtual size_t     minSize()        const = 0;
+  // Reset the dictionary to the initial conditions for a single
+  // block.
+  virtual void       reset(HeapWord* addr, size_t size) = 0;
+  virtual void       reset() = 0;
+
+  virtual void       dictCensusUpdate(size_t size, bool split, bool birth) = 0;
+  virtual bool       coalDictOverPopulated(size_t size) = 0;
+  virtual void       beginSweepDictCensus(double coalSurplusPercent,
+                       float inter_sweep_current, float inter_sweep_estimate,
+                       float intra__sweep_current) = 0;
+  virtual void       endSweepDictCensus(double splitSurplusPercent) = 0;
+  virtual Chunk*     findLargestDict() const = 0;
+  // verify that the given chunk is in the dictionary.
+  virtual bool verifyChunkInFreeLists(Chunk* tc) const = 0;
+
+  // Sigma_{all_free_blocks} (block_size^2)
+  virtual double sum_of_squared_block_sizes() const = 0;
+
+  virtual Chunk* find_chunk_ends_at(HeapWord* target) const = 0;
+  virtual void inc_totalSize(size_t v) = 0;
+  virtual void dec_totalSize(size_t v) = 0;
+
+  NOT_PRODUCT (
+    virtual size_t   sumDictReturnedBytes() = 0;
+    virtual void     initializeDictReturnedBytes() = 0;
+    virtual size_t   totalCount() = 0;
+  )
+
+  virtual void       reportStatistics() const {
+    gclog_or_tty->print("No statistics available");
+  }
+
+  virtual void       printDictCensus() const = 0;
+  virtual void       print_free_lists(outputStream* st) const = 0;
+
+  virtual void       verify()         const = 0;
+
+  Mutex* par_lock()                const PRODUCT_RETURN0;
+  void   set_par_lock(Mutex* lock)       PRODUCT_RETURN;
+  void   verify_par_locked()       const PRODUCT_RETURN;
+};
+
+#endif // SHARE_VM_MEMORY_FREEBLOCKDICTIONARY_HPP