--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/z/zObjectAllocator.hpp	Tue Jun 12 17:40:28 2018 +0200
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2015, 2018, 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_ZOBJECTALLOCATOR_HPP
+#define SHARE_GC_Z_ZOBJECTALLOCATOR_HPP
+
+#include "gc/z/zAllocationFlags.hpp"
+#include "gc/z/zPage.hpp"
+#include "gc/z/zValue.hpp"
+#include "memory/allocation.hpp"
+
+class ZObjectAllocator {
+private:
+  const uint         _nworkers;
+  ZPerCPU<size_t>    _used;
+  ZContended<ZPage*> _shared_medium_page;
+  ZPerCPU<ZPage*>    _shared_small_page;
+  ZPerWorker<ZPage*> _worker_small_page;
+
+  ZPage* alloc_page(uint8_t type, size_t size, ZAllocationFlags flags);
+
+  // Allocate an object in a shared page. Allocate and
+  // atomically install a new page if neccesary.
+  uintptr_t alloc_object_in_shared_page(ZPage** shared_page,
+                                        uint8_t page_type,
+                                        size_t page_size,
+                                        size_t size,
+                                        ZAllocationFlags flags);
+
+  uintptr_t alloc_large_object(size_t size, ZAllocationFlags flags);
+  uintptr_t alloc_medium_object(size_t size, ZAllocationFlags flags);
+  uintptr_t alloc_small_object_from_nonworker(size_t size, ZAllocationFlags flags);
+  uintptr_t alloc_small_object_from_worker(size_t size, ZAllocationFlags flags);
+  uintptr_t alloc_small_object(size_t size, ZAllocationFlags flags);
+  uintptr_t alloc_object(size_t size, ZAllocationFlags flags);
+
+  bool undo_alloc_large_object(ZPage* page);
+  bool undo_alloc_medium_object(ZPage* page, uintptr_t addr, size_t size);
+  bool undo_alloc_small_object_from_nonworker(ZPage* page, uintptr_t addr, size_t size);
+  bool undo_alloc_small_object_from_worker(ZPage* page, uintptr_t addr, size_t size);
+  bool undo_alloc_small_object(ZPage* page, uintptr_t addr, size_t size);
+  bool undo_alloc_object(ZPage* page, uintptr_t addr, size_t size);
+
+public:
+  ZObjectAllocator(uint nworkers);
+
+  uintptr_t alloc_object(size_t size);
+
+  uintptr_t alloc_object_for_relocation(size_t size);
+  void undo_alloc_object_for_relocation(ZPage* page, uintptr_t addr, size_t size);
+
+  size_t used() const;
+  size_t remaining() const;
+
+  void retire_tlabs();
+  void remap_tlabs();
+};
+
+#endif // SHARE_GC_Z_ZOBJECTALLOCATOR_HPP