diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/hotspot/share/libadt/dict.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/libadt/dict.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 1997, 2010, 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_LIBADT_DICT_HPP
+#define SHARE_VM_LIBADT_DICT_HPP
+
+// Dictionaries - An Abstract Data Type
+
+#include "memory/allocation.inline.hpp"
+#include "memory/resourceArea.hpp"
+#include "runtime/thread.hpp"
+
+class Dict;
+
+// These dictionaries define a key-value mapping.  They can be inserted to,
+// searched or deleted from.  They grow and shrink as needed.  The key is a
+// pointer to something (or anything which can be stored in a pointer).  A
+// key comparison routine determines if two keys are equal or not.  A hash
+// function can be provided; if it's not provided the key itself is used
+// instead.  A nice string hash function is included.
+typedef int32_t (*CmpKey)(const void *key1, const void *key2);
+typedef int  (*Hash)(const void *key);
+typedef void (*FuncDict)(const void *key, const void *val, Dict *d);
+
+class Dict : public ResourceObj { // Dictionary structure
+ private:
+  class Arena *_arena;          // Where to draw storage from
+  class bucket *_bin;           // Hash table is array of buckets
+  uint _size;                   // Size (# of slots) in hash table
+  uint32_t _cnt;                // Number of key-value pairs in hash table
+  const Hash _hash;             // Hashing function
+  const CmpKey _cmp;            // Key comparison function
+  void doubhash( void );        // Double hash table size
+
+ public:
+  friend class DictI;            // Friendly iterator function
+
+  // cmp is a key comparision routine.  hash is a routine to hash a key.
+  Dict( CmpKey cmp, Hash hash );
+  Dict( CmpKey cmp, Hash hash, Arena *arena, int size=16 );
+  ~Dict();
+
+  Dict( const Dict & );         // Deep-copy guts
+  Dict &operator =( const Dict & );
+
+  // Zap to empty; ready for re-use
+  void Clear();
+
+  // Return # of key-value pairs in dict
+  uint32_t Size(void) const { return _cnt; }
+
+  // Insert inserts the given key-value pair into the dictionary.  The prior
+  // value of the key is returned; NULL if the key was not previously defined.
+  void *Insert(void *key, void *val, bool replace = true); // A new key-value
+  void *Delete(void *key);        // Delete & return old
+
+  // Find finds the value of a given key; or NULL if not found.
+  // The dictionary is NOT changed.
+  void *operator [](const void *key) const;  // Do a lookup
+
+  // == compares two dictionaries; they must have the same keys (their keys
+  // must match using CmpKey) and they must have the same values (pointer
+  // comparison).  If so 1 is returned, if not 0 is returned.
+  int32_t operator ==(const Dict &d) const;   // Compare dictionaries for equal
+
+  // Print out the dictionary contents as key-value pairs
+  void print();
+};
+
+// Hashing functions
+int hashstr(const void *s);        // Nice string hash
+// Slimey cheap hash function; no guaranteed performance.  Better than the
+// default for pointers, especially on MS-DOS machines.
+int hashptr(const void *key);
+// Slimey cheap hash function; no guaranteed performance.
+int hashkey(const void *key);
+
+// Key comparators
+int32_t cmpstr(const void *k1, const void *k2);
+// Slimey cheap key comparator.
+int32_t cmpkey(const void *key1, const void *key2);
+
+//------------------------------Iteration--------------------------------------
+// The class of dictionary iterators.  Fails in the presences of modifications
+// to the dictionary during iteration (including searches).
+// Usage:  for( DictI i(dict); i.test(); ++i ) { body = i.key; body = i.value;}
+class DictI {
+ private:
+  const Dict *_d;               // Dictionary being iterated over
+  uint _i;                      // Counter over the bins
+  uint _j;                      // Counter inside each bin
+ public:
+  const void *_key, *_value;    // Easy access to the key-value pair
+  DictI( const Dict *d ) {reset(d);}; // Create a new iterator
+  void reset( const Dict *dict );     // Reset existing iterator
+  void operator ++(void);             // Increment iterator
+  int test(void) { return _i<_d->_size;} // Test for end of iteration
+};
+
+#endif // SHARE_VM_LIBADT_DICT_HPP