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1 /*
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2 * Copyright 2001-2003 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // This is a shared helper class used during phase 3 and 4 to move all the objects
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26 // Dead regions in a Space are linked together to keep track of the live regions
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27 // so that the live data can be traversed quickly without having to look at each
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28 // object.
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29
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30 class LiveRange: public MemRegion {
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31 public:
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32 LiveRange(HeapWord* bottom, HeapWord* top): MemRegion(bottom, top) {}
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33
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34 void set_end(HeapWord* e) {
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35 assert(e >= start(), "should be a non-zero range");
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36 MemRegion::set_end(e);
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37 }
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38 void set_word_size(size_t ws) {
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39 assert(ws >= 0, "should be a non-zero range");
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40 MemRegion::set_word_size(ws);
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41 }
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42
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43 LiveRange * next() { return (LiveRange *) end(); }
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44
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45 void move_to(HeapWord* destination) {
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46 Copy::aligned_conjoint_words(start(), destination, word_size());
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47 }
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48 };
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