/*
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_LIVERANGE_HPP
#define SHARE_VM_GC_IMPLEMENTATION_SHARED_LIVERANGE_HPP
#include "memory/memRegion.hpp"
#include "utilities/copy.hpp"
// This is a shared helper class used during phase 3 and 4 to move all the objects
// Dead regions in a Space are linked together to keep track of the live regions
// so that the live data can be traversed quickly without having to look at each
// object.
class LiveRange: public MemRegion {
public:
LiveRange(HeapWord* bottom, HeapWord* top): MemRegion(bottom, top) {}
void set_end(HeapWord* e) {
assert(e >= start(), "should be a non-zero range");
MemRegion::set_end(e);
}
void set_word_size(size_t ws) {
assert(ws >= 0, "should be a non-zero range");
MemRegion::set_word_size(ws);
}
LiveRange * next() { return (LiveRange *) end(); }
void move_to(HeapWord* destination) {
Copy::aligned_conjoint_words(start(), destination, word_size());
}
};
#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_LIVERANGE_HPP