1/*
2 * Copyright (c) 2001, 2016, 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
31int**  G1FromCardCache::_cache = NULL;
32uint   G1FromCardCache::_max_regions = 0;
33size_t G1FromCardCache::_static_mem_size = 0;
34
35void 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(_max_regions,
41                                                       num_par_rem_sets,
42                                                       &_static_mem_size);
43
44  invalidate(0, _max_regions);
45}
46
47void 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  uint end_idx = (start_idx + (uint)new_num_regions);
52  assert(end_idx <= _max_regions, "Must be within max.");
53
54  for (uint i = 0; i < G1RemSet::num_par_rem_sets(); i++) {
55    for (uint j = start_idx; j < end_idx; j++) {
56      set(i, j, InvalidCard);
57    }
58  }
59}
60
61#ifndef PRODUCT
62void G1FromCardCache::print(outputStream* out) {
63  for (uint i = 0; i < G1RemSet::num_par_rem_sets(); i++) {
64    for (uint j = 0; j < _max_regions; j++) {
65      out->print_cr("_from_card_cache[%u][%u] = %d.",
66                    i, j, at(i, j));
67    }
68  }
69}
70#endif
71
72void G1FromCardCache::clear(uint region_idx) {
73  uint num_par_remsets = G1RemSet::num_par_rem_sets();
74  for (uint i = 0; i < num_par_remsets; i++) {
75    set(i, region_idx, InvalidCard);
76  }
77}
78