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1 /*
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2 * Copyright 2000-2001 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 // A water mark points into a space and is used during GC to keep track of
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26 // progress.
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27
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28 class Space;
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29
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30 class WaterMark VALUE_OBJ_CLASS_SPEC {
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31 friend class VMStructs;
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32 private:
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33 HeapWord* _point;
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34 Space* _space;
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35 public:
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36 // Accessors
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37 Space* space() const { return _space; }
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38 void set_space(Space* s) { _space = s; }
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39 HeapWord* point() const { return _point; }
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40 void set_point(HeapWord* p) { _point = p; }
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41
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42 // Constructors
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43 WaterMark(Space* s, HeapWord* p) : _space(s), _point(p) {};
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44 WaterMark() : _space(NULL), _point(NULL) {};
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45 };
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46
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47 inline bool operator==(const WaterMark& x, const WaterMark& y) {
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48 return (x.point() == y.point()) && (x.space() == y.space());
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49 }
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50
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51 inline bool operator!=(const WaterMark& x, const WaterMark& y) {
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52 return !(x == y);
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53 }
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