--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/g1/g1RootClosures.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,73 @@
+/*
+ * 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_VM_GC_G1_G1ROOTCLOSURESET_HPP
+#define SHARE_VM_GC_G1_G1ROOTCLOSURESET_HPP
+
+#include "memory/allocation.hpp"
+#include "memory/iterator.hpp"
+
+class G1CollectedHeap;
+class G1ParScanThreadState;
+
+class G1RootClosures : public CHeapObj<mtGC> {
+public:
+  virtual ~G1RootClosures() {}
+
+// Closures to process raw oops in the root set.
+  virtual OopClosure* weak_oops() = 0;
+  virtual OopClosure* strong_oops() = 0;
+
+  // Closures to process CLDs in the root set.
+  virtual CLDClosure* weak_clds() = 0;
+  virtual CLDClosure* strong_clds() = 0;
+
+  // Applied to code blobs reachable as strong roots.
+  virtual CodeBlobClosure* strong_codeblobs() = 0;
+};
+
+class G1EvacuationRootClosures : public G1RootClosures {
+  static G1EvacuationRootClosures* create_root_closures_ext(G1ParScanThreadState* pss, G1CollectedHeap* g1h);
+public:
+  // Flush any buffered state and deferred processing
+  virtual void flush() = 0;
+  virtual double closure_app_seconds() = 0;
+
+  // Applied to the weakly reachable CLDs when all strongly reachable
+  // CLDs are guaranteed to have been processed.
+  virtual CLDClosure* second_pass_weak_clds() = 0;
+
+  // Get a raw oop closure for processing oops, bypassing the flushing above.
+  virtual OopClosure* raw_strong_oops() = 0;
+
+  // Applied to code blobs treated as weak roots.
+  virtual CodeBlobClosure* weak_codeblobs() = 0;
+
+  // Is this closure used for tracing metadata?
+  virtual bool trace_metadata() = 0;
+
+  static G1EvacuationRootClosures* create_root_closures(G1ParScanThreadState* pss, G1CollectedHeap* g1h);
+};
+
+#endif // SHARE_VM_GC_G1_G1ROOTCLOSURESET_HPP