--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/g1/g1FullGCPrepareTask.hpp	Tue Nov 14 11:33:23 2017 +0100
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 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_G1_G1FULLGCPREPARETASK_HPP
+#define SHARE_GC_G1_G1FULLGCPREPARETASK_HPP
+
+#include "gc/g1/g1FullGCCompactionPoint.hpp"
+#include "gc/g1/g1FullGCScope.hpp"
+#include "gc/g1/g1FullGCTask.hpp"
+#include "gc/g1/g1RootProcessor.hpp"
+#include "gc/g1/g1StringDedup.hpp"
+#include "gc/g1/heapRegionManager.hpp"
+#include "gc/shared/referenceProcessor.hpp"
+#include "utilities/ticks.hpp"
+
+class G1CMBitMap;
+
+class G1FullGCPrepareTask : public G1FullGCTask {
+protected:
+  volatile bool     _freed_regions;
+  HeapRegionClaimer _hrclaimer;
+
+  void set_freed_regions();
+
+public:
+  G1FullGCPrepareTask(G1FullCollector* collector);
+  void work(uint worker_id);
+  void prepare_serial_compaction();
+  bool has_freed_regions();
+
+protected:
+  class G1CalculatePointersClosure : public HeapRegionClosure {
+  protected:
+    G1CollectedHeap* _g1h;
+    G1CMBitMap* _bitmap;
+    G1FullGCCompactionPoint* _cp;
+    uint _humongous_regions_removed;
+
+    virtual void prepare_for_compaction(HeapRegion* hr);
+    void prepare_for_compaction_work(G1FullGCCompactionPoint* cp, HeapRegion* hr);
+    void free_humongous_region(HeapRegion* hr);
+    void reset_region_metadata(HeapRegion* hr);
+
+  public:
+    G1CalculatePointersClosure(G1CMBitMap* bitmap,
+                               G1FullGCCompactionPoint* cp);
+
+    void update_sets();
+    bool doHeapRegion(HeapRegion* hr);
+    bool freed_regions();
+  };
+
+  class G1PrepareCompactLiveClosure : public StackObj {
+    G1FullGCCompactionPoint* _cp;
+
+  public:
+    G1PrepareCompactLiveClosure(G1FullGCCompactionPoint* cp);
+    size_t apply(oop object);
+  };
+
+  class G1RePrepareClosure : public StackObj {
+    G1FullGCCompactionPoint* _cp;
+    HeapRegion* _current;
+
+  public:
+    G1RePrepareClosure(G1FullGCCompactionPoint* hrcp,
+                       HeapRegion* hr) :
+        _cp(hrcp),
+        _current(hr) { }
+
+    size_t apply(oop object);
+  };
+};
+
+#endif // SHARE_GC_G1_G1FULLGCPREPARETASK_HPP