--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,108 @@
+/*
+ * Copyright 2001-2003 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+class MutableSpace;
+class ObjectStartArray;
+class PSPromotionManager;
+class GCTaskQueue;
+
+class CardTableExtension : public CardTableModRefBS {
+ private:
+  // Support methods for resizing the card table.
+  void resize_commit_uncommit(int changed_region, MemRegion new_region);
+  void resize_update_card_table_entries(int changed_region,
+                                        MemRegion new_region);
+  void resize_update_committed_table(int changed_region, MemRegion new_region);
+  void resize_update_covered_table(int changed_region, MemRegion new_region);
+
+ protected:
+
+  static void verify_all_young_refs_precise_helper(MemRegion mr);
+
+ public:
+  enum ExtendedCardValue {
+    youngergen_card   = CardTableModRefBS::CT_MR_BS_last_reserved + 1,
+    verify_card       = CardTableModRefBS::CT_MR_BS_last_reserved + 5
+  };
+
+  CardTableExtension(MemRegion whole_heap, int max_covered_regions) :
+    CardTableModRefBS(whole_heap, max_covered_regions) { }
+
+  // Too risky for the 4/10/02 putback
+  // BarrierSet::Name kind() { return BarrierSet::CardTableExtension; }
+
+  // Scavenge support
+  void scavenge_contents(ObjectStartArray* start_array,
+                         MutableSpace* sp,
+                         HeapWord* space_top,
+                         PSPromotionManager* pm);
+
+  void scavenge_contents_parallel(ObjectStartArray* start_array,
+                                  MutableSpace* sp,
+                                  HeapWord* space_top,
+                                  PSPromotionManager* pm,
+                                  uint stripe_number);
+
+  // Verification
+  static void verify_all_young_refs_imprecise();
+  static void verify_all_young_refs_precise();
+
+  bool addr_is_marked_imprecise(void *addr);
+  bool addr_is_marked_precise(void *addr);
+
+  void set_card_newgen(void* addr)   { jbyte* p = byte_for(addr); *p = verify_card; }
+
+  // Testers for entries
+  static bool card_is_dirty(int value)      { return value == dirty_card; }
+  static bool card_is_newgen(int value)     { return value == youngergen_card; }
+  static bool card_is_clean(int value)      { return value == clean_card; }
+  static bool card_is_verify(int value)     { return value == verify_card; }
+
+  // Card marking
+  void inline_write_ref_field_gc(oop* field, oop new_val) {
+    jbyte* byte = byte_for(field);
+    *byte = youngergen_card;
+  }
+
+  // Adaptive size policy support
+  // Allows adjustment of the base and size of the covered regions
+  void resize_covered_region(MemRegion new_region);
+  // Finds the covered region to resize based on the start address
+  // of the covered regions.
+  void resize_covered_region_by_start(MemRegion new_region);
+  // Finds the covered region to resize based on the end address
+  // of the covered regions.
+  void resize_covered_region_by_end(int changed_region, MemRegion new_region);
+  // Finds the lowest start address of a covered region that is
+  // previous (i.e., lower index) to the covered region with index "ind".
+  HeapWord* lowest_prev_committed_start(int ind) const;
+
+#ifdef ASSERT
+
+  bool is_valid_card_address(jbyte* addr) {
+    return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size);
+  }
+
+#endif // ASSERT
+};