1 /*
   2  * Copyright (c) 2001, 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  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "gc/g1/g1FromCardCache.hpp"
  27 #include "gc/g1/g1RemSet.hpp"
  28 #include "memory/padded.inline.hpp"
  29 #include "utilities/debug.hpp"
  30 
  31 int**  G1FromCardCache::_cache = NULL;
  32 uint   G1FromCardCache::_max_regions = 0;
  33 size_t G1FromCardCache::_static_mem_size = 0;
  34 
  35 void G1FromCardCache::initialize(uint num_par_rem_sets, uint max_num_regions) {
  36   guarantee(max_num_regions > 0, "Heap size must be valid");
  37   guarantee(_cache == NULL, "Should not call this multiple times");
  38 
  39   _max_regions = max_num_regions;
  40   _cache = Padded2DArray<int, mtGC>::create_unfreeable(num_par_rem_sets,
  41                                                        _max_regions,
  42                                                        &_static_mem_size);
  43 
  44   invalidate(0, _max_regions);
  45 }
  46 
  47 void G1FromCardCache::invalidate(uint start_idx, size_t new_num_regions) {
  48   guarantee((size_t)start_idx + new_num_regions <= max_uintx,
  49             "Trying to invalidate beyond maximum region, from %u size " SIZE_FORMAT,
  50             start_idx, new_num_regions);
  51   for (uint i = 0; i < G1RemSet::num_par_rem_sets(); i++) {
  52     uint end_idx = (start_idx + (uint)new_num_regions);
  53     assert(end_idx <= _max_regions, "Must be within max.");
  54     for (uint j = start_idx; j < end_idx; j++) {
  55       set(i, j, InvalidCard);
  56     }
  57   }
  58 }
  59 
  60 #ifndef PRODUCT
  61 void G1FromCardCache::print(outputStream* out) {
  62   for (uint i = 0; i < G1RemSet::num_par_rem_sets(); i++) {
  63     for (uint j = 0; j < _max_regions; j++) {
  64       out->print_cr("_from_card_cache[%u][%u] = %d.",
  65                     i, j, at(i, j));
  66     }
  67   }
  68 }
  69 #endif
  70 
  71 void G1FromCardCache::clear(uint region_idx) {
  72   uint num_par_remsets = G1RemSet::num_par_rem_sets();
  73   for (uint i = 0; i < num_par_remsets; i++) {
  74     set(i, region_idx, InvalidCard);
  75   }
  76 }