1 /*
2 * Copyright (c) 2018, 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/shared/markBitMap.inline.hpp"
27 #include "memory/universe.hpp"
28 #include "memory/virtualspace.hpp"
29
print_on_error(outputStream * st,const char * prefix) const30 void MarkBitMap::print_on_error(outputStream* st, const char* prefix) const {
31 _bm.print_on_error(st, prefix);
32 }
33
compute_size(size_t heap_size)34 size_t MarkBitMap::compute_size(size_t heap_size) {
35 return ReservedSpace::allocation_align_size_up(heap_size / mark_distance());
36 }
37
mark_distance()38 size_t MarkBitMap::mark_distance() {
39 return MinObjAlignmentInBytes * BitsPerByte;
40 }
41
initialize(MemRegion heap,MemRegion storage)42 void MarkBitMap::initialize(MemRegion heap, MemRegion storage) {
43 _covered = heap;
44
45 _bm = BitMapView((BitMap::bm_word_t*) storage.start(), _covered.word_size() >> _shifter);
46 }
47
do_clear(MemRegion mr,bool large)48 void MarkBitMap::do_clear(MemRegion mr, bool large) {
49 MemRegion intersection = mr.intersection(_covered);
50 assert(!intersection.is_empty(),
51 "Given range from " PTR_FORMAT " to " PTR_FORMAT " is completely outside the heap",
52 p2i(mr.start()), p2i(mr.end()));
53 // convert address range into offset range
54 size_t beg = addr_to_offset(intersection.start());
55 size_t end = addr_to_offset(intersection.end());
56 if (large) {
57 _bm.clear_large_range(beg, end);
58 } else {
59 _bm.clear_range(beg, end);
60 }
61 }
62
63 #ifdef ASSERT
check_mark(HeapWord * addr)64 void MarkBitMap::check_mark(HeapWord* addr) {
65 assert(Universe::heap()->is_in(addr),
66 "Trying to access bitmap " PTR_FORMAT " for address " PTR_FORMAT " not in the heap.",
67 p2i(this), p2i(addr));
68 }
69 #endif
70