--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/cms/cmsCardTable.hpp	Tue Apr 10 12:20:00 2018 +0200
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2001, 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_CMS_CMSCARDTABLE_HPP
+#define SHARE_GC_CMS_CMSCARDTABLE_HPP
+
+#include "gc/shared/cardTableRS.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+class DirtyCardToOopClosure;
+class MemRegion;
+class OopsInGenClosure;
+class Space;
+
+class CMSCardTable : public CardTableRS {
+private:
+  // Returns the number of chunks necessary to cover "mr".
+  size_t chunks_to_cover(MemRegion mr);
+
+  // Returns the index of the chunk in a stride which
+  // covers the given address.
+  uintptr_t addr_to_chunk_index(const void* addr);
+
+  // Initializes "lowest_non_clean" to point to the array for the region
+  // covering "sp", and "lowest_non_clean_base_chunk_index" to the chunk
+  // index of the corresponding to the first element of that array.
+  // Ensures that these arrays are of sufficient size, allocating if necessary.
+  // May be called by several threads concurrently.
+  void get_LNC_array_for_space(Space* sp,
+                               jbyte**& lowest_non_clean,
+                               uintptr_t& lowest_non_clean_base_chunk_index,
+                               size_t& lowest_non_clean_chunk_size);
+
+  // Apply cl, which must either itself apply dcto_cl or be dcto_cl,
+  // to the cards in the stride (of n_strides) within the given space.
+  void process_stride(Space* sp,
+                      MemRegion used,
+                      jint stride, int n_strides,
+                      OopsInGenClosure* cl,
+                      CardTableRS* ct,
+                      jbyte** lowest_non_clean,
+                      uintptr_t lowest_non_clean_base_chunk_index,
+                      size_t lowest_non_clean_chunk_size);
+
+  // Makes sure that chunk boundaries are handled appropriately, by
+  // adjusting the min_done of dcto_cl, and by using a special card-table
+  // value to indicate how min_done should be set.
+  void process_chunk_boundaries(Space* sp,
+                                DirtyCardToOopClosure* dcto_cl,
+                                MemRegion chunk_mr,
+                                MemRegion used,
+                                jbyte** lowest_non_clean,
+                                uintptr_t lowest_non_clean_base_chunk_index,
+                                size_t    lowest_non_clean_chunk_size);
+
+  virtual void verify_used_region_at_save_marks(Space* sp) const NOT_DEBUG_RETURN;
+
+protected:
+  // Work method used to implement non_clean_card_iterate_possibly_parallel()
+  // above in the parallel case.
+  virtual void non_clean_card_iterate_parallel_work(Space* sp, MemRegion mr,
+                                                    OopsInGenClosure* cl, CardTableRS* ct,
+                                                    uint n_threads);
+
+public:
+  CMSCardTable(MemRegion whole_heap);
+};
+
+#endif // SHARE_GC_CMS_CMSCARDTABLE_HPP