--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/jvmci/jvmciHashtable.hpp	Thu May 28 21:58:33 2015 +0200
@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 2015, 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_JVMCI_JVMCI_HASHTABLE_HPP
+#define SHARE_VM_JVMCI_JVMCI_HASHTABLE_HPP
+
+#include "memory/allocation.hpp"
+#include "memory/allocation.inline.hpp"
+
+// based on hashtable.hpp
+
+template <class T> class JVMCIHashtableEntry : public CHeapObj<mtCompiler> {
+  friend class VMStructs;
+private:
+  T               _literal;       // ref to item in table.
+  JVMCIHashtableEntry*  _next;          // Link to next element in the linked list for this bucket
+
+public:
+  JVMCIHashtableEntry(T literal) :  _literal(literal), _next(NULL) {}
+
+  T literal() {
+    return _literal;
+  }
+
+  void set_literal(T value) {
+    _literal = value;
+  }
+
+  T* literal_addr() {
+    return &_literal;
+  }
+
+  JVMCIHashtableEntry* next() const {
+    return _next;
+  }
+
+  void set_next(JVMCIHashtableEntry* next) {
+    _next = next;
+  }
+};
+
+template <class V>
+class ValueClosure : public StackObj {
+  bool _abort;
+protected:
+  void abort() { _abort = true; }
+public:
+  ValueClosure() : _abort(false) {}
+  virtual void do_value(V* value) = 0;
+  bool is_aborted() { return _abort; }
+};
+
+template <class K, class V> class JVMCIHashtable : public CHeapObj<mtCompiler> {
+  friend class VMStructs;
+private:
+  // Instance variables
+  unsigned int             _table_size;
+  JVMCIHashtableEntry<V>** _buckets;
+  unsigned int             _number_of_entries;
+
+public:
+  JVMCIHashtable(size_t size) : _table_size(size), _number_of_entries(0) {
+    _buckets = NEW_C_HEAP_ARRAY(JVMCIHashtableEntry<V>*, table_size(), mtCompiler);
+    for (size_t i = 0; i < table_size(); ++i) {
+      _buckets[i] = NULL;
+    }
+  }
+  virtual ~JVMCIHashtable();
+
+private:
+  // Bucket handling
+  unsigned int hash_to_index(unsigned int full_hash) {
+    unsigned int h = full_hash % _table_size;
+    assert(h >= 0 && h < _table_size, "Illegal hash value");
+    return h;
+  }
+
+  unsigned  int index_for(K key) {
+    return hash_to_index(compute_hash(key));
+  }
+
+  size_t entry_size() {
+    return sizeof(V);
+  }
+
+  size_t table_size() { return _table_size; }
+
+  JVMCIHashtableEntry<V>* bucket(unsigned int index) {
+    return _buckets[index];
+  }
+
+  bool add(V v, bool replace);
+
+protected:
+  virtual unsigned int compute_hash(K key) = 0;
+  virtual bool key_equals(K k1, K k2) = 0;
+  virtual K get_key(V value) = 0;
+  virtual K get_key(V* value) = 0;
+
+public:
+  /**
+   * Tries to insert the value in the hash table. Returns false if an entry with the same key already exists.
+   * In this case it does *not* replace the existing entry.
+   */
+  bool add(V v) { return add(v, false); }
+  /**
+   * Inserts the value in the hash table. Returns false if an entry with the same key already exists.
+   * In this case it replaces the existing entry.
+   */
+  bool put(V v) { return add(v, true); }
+  V* get(K k);
+  void for_each(ValueClosure<V>* closure);
+  int number_of_entries() { return _number_of_entries; }
+
+};
+
+#endif // SHARE_VM_JVMCI_JVMCI_HASHTABLE_HPP