1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/shared/liveRange.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,56 @@
1.4 +/*
1.5 + * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_LIVERANGE_HPP
1.29 +#define SHARE_VM_GC_IMPLEMENTATION_SHARED_LIVERANGE_HPP
1.30 +
1.31 +#include "memory/memRegion.hpp"
1.32 +#include "utilities/copy.hpp"
1.33 +
1.34 +// This is a shared helper class used during phase 3 and 4 to move all the objects
1.35 +// Dead regions in a Space are linked together to keep track of the live regions
1.36 +// so that the live data can be traversed quickly without having to look at each
1.37 +// object.
1.38 +
1.39 +class LiveRange: public MemRegion {
1.40 +public:
1.41 + LiveRange(HeapWord* bottom, HeapWord* top): MemRegion(bottom, top) {}
1.42 +
1.43 + void set_end(HeapWord* e) {
1.44 + assert(e >= start(), "should be a non-zero range");
1.45 + MemRegion::set_end(e);
1.46 + }
1.47 + void set_word_size(size_t ws) {
1.48 + assert(ws >= 0, "should be a non-zero range");
1.49 + MemRegion::set_word_size(ws);
1.50 + }
1.51 +
1.52 + LiveRange * next() { return (LiveRange *) end(); }
1.53 +
1.54 + void move_to(HeapWord* destination) {
1.55 + Copy::aligned_conjoint_words(start(), destination, word_size());
1.56 + }
1.57 +};
1.58 +
1.59 +#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_LIVERANGE_HPP
