| /* |
| * Copyright (c) 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "gc/g1/g1CollectedHeap.inline.hpp" |
| #include "gc/g1/g1ConcurrentMarkBitMap.inline.hpp" |
| #include "memory/virtualspace.hpp" |
| |
| void G1CMBitMap::print_on_error(outputStream* st, const char* prefix) const { |
| _bm.print_on_error(st, prefix); |
| } |
| |
| size_t G1CMBitMap::compute_size(size_t heap_size) { |
| return ReservedSpace::allocation_align_size_up(heap_size / mark_distance()); |
| } |
| |
| size_t G1CMBitMap::mark_distance() { |
| return MinObjAlignmentInBytes * BitsPerByte; |
| } |
| |
| void G1CMBitMap::initialize(MemRegion heap, G1RegionToSpaceMapper* storage) { |
| _covered = heap; |
| |
| _bm = BitMapView((BitMap::bm_word_t*) storage->reserved().start(), _covered.word_size() >> _shifter); |
| |
| storage->set_mapping_changed_listener(&_listener); |
| } |
| |
| void G1CMBitMapMappingChangedListener::on_commit(uint start_region, size_t num_regions, bool zero_filled) { |
| if (zero_filled) { |
| return; |
| } |
| // We need to clear the bitmap on commit, removing any existing information. |
| MemRegion mr(G1CollectedHeap::heap()->bottom_addr_for_region(start_region), num_regions * HeapRegion::GrainWords); |
| _bm->clear_range(mr); |
| } |
| |
| void G1CMBitMap::clear_range(MemRegion mr) { |
| MemRegion intersection = mr.intersection(_covered); |
| assert(!intersection.is_empty(), |
| "Given range from " PTR_FORMAT " to " PTR_FORMAT " is completely outside the heap", |
| p2i(mr.start()), p2i(mr.end())); |
| // convert address range into offset range |
| _bm.at_put_range(addr_to_offset(intersection.start()), |
| addr_to_offset(intersection.end()), false); |
| } |