--- /dev/null	2018-04-03 12:55:20.301839954 +0200
+++ new/src/hotspot/share/gc/z/zArray.hpp	2018-06-06 00:41:37.726008015 +0200
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2015, 2017, 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_GC_Z_ZARRAY_HPP
+#define SHARE_GC_Z_ZARRAY_HPP
+
+#include "memory/allocation.hpp"
+
+template <typename T>
+class ZArray {
+private:
+  static const size_t initial_capacity = 32;
+
+  T*     _array;
+  size_t _size;
+  size_t _capacity;
+
+  // Copy and assignment are not allowed
+  ZArray(const ZArray<T>& array);
+  ZArray<T>& operator=(const ZArray<T>& array);
+
+  void expand(size_t new_capacity);
+
+public:
+  ZArray();
+  ~ZArray();
+
+  size_t size() const;
+  bool is_empty() const;
+
+  T at(size_t index) const;
+
+  void add(T value);
+  void clear();
+};
+
+template <typename T, bool parallel>
+class ZArrayIteratorImpl : public StackObj {
+private:
+  ZArray<T>* const _array;
+  size_t           _next;
+
+public:
+  ZArrayIteratorImpl(ZArray<T>* array);
+
+  bool next(T* elem);
+};
+
+// Iterator types
+#define ZARRAY_SERIAL      false
+#define ZARRAY_PARALLEL    true
+
+template <typename T>
+class ZArrayIterator : public ZArrayIteratorImpl<T, ZARRAY_SERIAL> {
+public:
+  ZArrayIterator(ZArray<T>* array) :
+      ZArrayIteratorImpl<T, ZARRAY_SERIAL>(array) {}
+};
+
+template <typename T>
+class ZArrayParallelIterator : public ZArrayIteratorImpl<T, ZARRAY_PARALLEL> {
+public:
+  ZArrayParallelIterator(ZArray<T>* array) :
+      ZArrayIteratorImpl<T, ZARRAY_PARALLEL>(array) {}
+};
+
+#endif // SHARE_GC_Z_ZARRAY_HPP