56 lines
1.9 KiB
C++
56 lines
1.9 KiB
C++
/*
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* Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_GC_SHARED_LIVERANGE_HPP
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#define SHARE_VM_GC_SHARED_LIVERANGE_HPP
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#include "memory/memRegion.hpp"
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#include "utilities/copy.hpp"
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// This is a shared helper class used during phase 3 and 4 to move all the objects
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// Dead regions in a Space are linked together to keep track of the live regions
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// so that the live data can be traversed quickly without having to look at each
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// object.
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class LiveRange: public MemRegion {
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public:
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LiveRange(HeapWord* bottom, HeapWord* top): MemRegion(bottom, top) {}
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void set_end(HeapWord* e) {
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assert(e >= start(), "should be a non-zero range");
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MemRegion::set_end(e);
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}
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void set_word_size(size_t ws) {
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MemRegion::set_word_size(ws);
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}
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LiveRange * next() { return (LiveRange *) end(); }
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void move_to(HeapWord* destination) {
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Copy::aligned_conjoint_words(start(), destination, word_size());
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}
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};
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#endif // SHARE_VM_GC_SHARED_LIVERANGE_HPP
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