1 /*
   2  * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *

  67   const jbyte* _ct_bot;
  68 
  69   // Barrier set
  70   CardTableModRefBS* _ct_bs;
  71 
  72   // Returns true if the card counts table has been reserved.
  73   bool has_reserved_count_table() { return _card_counts != NULL; }
  74 
  75   // Returns true if the card counts table has been reserved and committed.
  76   bool has_count_table() {
  77     return has_reserved_count_table();
  78   }
  79 
  80   size_t ptr_2_card_num(const jbyte* card_ptr) {
  81     assert(card_ptr >= _ct_bot,
  82            err_msg("Invalid card pointer: "
  83                    "card_ptr: " PTR_FORMAT ", "
  84                    "_ct_bot: " PTR_FORMAT,
  85                    p2i(card_ptr), p2i(_ct_bot)));
  86     size_t card_num = pointer_delta(card_ptr, _ct_bot, sizeof(jbyte));
  87     assert(card_num >= 0 && card_num < _reserved_max_card_num,
  88            err_msg("card pointer out of range: " PTR_FORMAT, p2i(card_ptr)));
  89     return card_num;
  90   }
  91 
  92   jbyte* card_num_2_ptr(size_t card_num) {
  93     assert(card_num >= 0 && card_num < _reserved_max_card_num,
  94            err_msg("card num out of range: "SIZE_FORMAT, card_num));
  95     return (jbyte*) (_ct_bot + card_num);
  96   }
  97 
  98   // Clear the counts table for the given (exclusive) index range.
  99   void clear_range(size_t from_card_num, size_t to_card_num);
 100 
 101  public:
 102   G1CardCounts(G1CollectedHeap* g1h);
 103 
 104   void initialize(G1RegionToSpaceMapper* mapper);
 105 
 106   // Increments the refinement count for the given card.
 107   // Returns the pre-increment count value.
 108   uint add_card_count(jbyte* card_ptr);
 109 
 110   // Returns true if the given count is high enough to be considered
 111   // 'hot'; false otherwise.
 112   bool is_hot(uint count);
 113 

   1 /*
   2  * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *

  67   const jbyte* _ct_bot;
  68 
  69   // Barrier set
  70   CardTableModRefBS* _ct_bs;
  71 
  72   // Returns true if the card counts table has been reserved.
  73   bool has_reserved_count_table() { return _card_counts != NULL; }
  74 
  75   // Returns true if the card counts table has been reserved and committed.
  76   bool has_count_table() {
  77     return has_reserved_count_table();
  78   }
  79 
  80   size_t ptr_2_card_num(const jbyte* card_ptr) {
  81     assert(card_ptr >= _ct_bot,
  82            err_msg("Invalid card pointer: "
  83                    "card_ptr: " PTR_FORMAT ", "
  84                    "_ct_bot: " PTR_FORMAT,
  85                    p2i(card_ptr), p2i(_ct_bot)));
  86     size_t card_num = pointer_delta(card_ptr, _ct_bot, sizeof(jbyte));
  87     assert(card_num < _reserved_max_card_num,
  88            err_msg("card pointer out of range: " PTR_FORMAT, p2i(card_ptr)));
  89     return card_num;
  90   }
  91 
  92   jbyte* card_num_2_ptr(size_t card_num) {
  93     assert(card_num < _reserved_max_card_num,
  94            err_msg("card num out of range: "SIZE_FORMAT, card_num));
  95     return (jbyte*) (_ct_bot + card_num);
  96   }
  97 
  98   // Clear the counts table for the given (exclusive) index range.
  99   void clear_range(size_t from_card_num, size_t to_card_num);
 100 
 101  public:
 102   G1CardCounts(G1CollectedHeap* g1h);
 103 
 104   void initialize(G1RegionToSpaceMapper* mapper);
 105 
 106   // Increments the refinement count for the given card.
 107   // Returns the pre-increment count value.
 108   uint add_card_count(jbyte* card_ptr);
 109 
 110   // Returns true if the given count is high enough to be considered
 111   // 'hot'; false otherwise.
 112   bool is_hot(uint count);
 113