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/virtualspace.hpp"

    28 

    29 void MarkBitMap::print_on_error(outputStream* st, const char* prefix) const {

    30   _bm.print_on_error(st, prefix);

    31 }

    32 

    33 size_t MarkBitMap::compute_size(size_t heap_size) {

    34   return ReservedSpace::allocation_align_size_up(heap_size / mark_distance());

    35 }

    36 

    37 size_t MarkBitMap::mark_distance() {

    38   return MinObjAlignmentInBytes * BitsPerByte;

    39 }

    40 

    41 void MarkBitMap::initialize(MemRegion heap, MemRegion storage) {

    42   _covered = heap;

    43 

    44   _bm = BitMapView((BitMap::bm_word_t*) storage.start(), _covered.word_size() >> _shifter);

    45 }

    46 

    47 void MarkBitMap::clear_range(MemRegion mr) {

    48   MemRegion intersection = mr.intersection(_covered);

    49   assert(!intersection.is_empty(),

    50          "Given range from " PTR_FORMAT " to " PTR_FORMAT " is completely outside the heap",

    51          p2i(mr.start()), p2i(mr.end()));

    52   // convert address range into offset range

    53   _bm.at_put_range(addr_to_offset(intersection.start()),

    54                    addr_to_offset(intersection.end()), false);

    55 }

    56 

    57 #ifdef ASSERT

    58 void MarkBitMap::check_mark(HeapWord* addr) {

    59   assert(Universe::heap()->is_in_reserved(addr),

    60          "Trying to access bitmap " PTR_FORMAT " for address " PTR_FORMAT " not in the heap.",

    61          p2i(this), p2i(addr));

    62 }

    63 #endif