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1 /*
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2 * Copyright 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 package sun.jvm.hotspot.utilities;
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26
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27 import sun.jvm.hotspot.oops.*;
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28
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29 /** Describes an element in a {@link
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30 sun.jvm.hotspot.utilities.LivenessPath}. It indicates that the
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31 field in the given object leads to the next element in the
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32 path. Root elements do not have an object; the terminal element in
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33 the path does not have a field identifier. */
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34
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35 public class LivenessPathElement {
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36 LivenessPathElement(Oop obj, FieldIdentifier id) {
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37 this.obj = obj;
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38 this.id = id;
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39 }
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40
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41 public boolean isRoot() {
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42 return (obj == null);
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43 }
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44
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45 public boolean isTerminal() {
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46 return (id == null);
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47 }
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48
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49 public Oop getObj() {
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50 return obj;
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51 }
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52
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53 public FieldIdentifier getField() {
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54 return id;
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55 }
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56
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57 //---------------------------------------------------------------------------
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58 // Internals only below this point
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59 //
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60 private Oop obj;
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61 private FieldIdentifier id;
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62 }
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