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annotate jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/site/Mark.java @ 23393:1d4ce2d19e52

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clean up and minimize JVMCI (JDK-8156835)
author Doug Simon <doug.simon@oracle.com>
date Thu, 12 May 2016 20:57:31 +0200
parents 9273bb6ba33e
children
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1 /*
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2 * Copyright (c) 2009, 2016, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package jdk.vm.ci.code.site;
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24
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25 import java.util.Objects;
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26
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27 /**
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28 * Associates arbitrary information with a position in machine code. For example, HotSpot specific
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29 * code in a compiler backend may use this to denote the position of a safepoint, exception handler
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30 * entry point, verified entry point etc.
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31 */
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32 public final class Mark extends Site {
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33
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34 /**
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35 * An object denoting extra semantic information about the machine code position of this mark.
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36 */
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37 public final Object id;
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38
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39 /**
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40 * Creates a mark that associates {@code id} with the machine code position {@code pcOffset}.
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41 *
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42 * @param pcOffset
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43 * @param id
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44 */
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45 public Mark(int pcOffset, Object id) {
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46 super(pcOffset);
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47 this.id = id;
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48 }
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49
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50 @Override
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51 public String toString() {
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52 if (id == null) {
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53 return String.format("%d[<mark>]", pcOffset);
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54 } else if (id instanceof Integer) {
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55 return String.format("%d[<mark with id %s>]", pcOffset, Integer.toHexString((Integer) id));
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56 } else {
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57 return String.format("%d[<mark with id %s>]", pcOffset, id.toString());
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58 }
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59 }
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60
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61 @Override
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62 public boolean equals(Object obj) {
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63 if (this == obj) {
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64 return true;
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65 }
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66 if (obj instanceof Mark) {
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67 Mark that = (Mark) obj;
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68 if (this.pcOffset == that.pcOffset && Objects.equals(this.id, that.id)) {
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69 return true;
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70 }
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71 }
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72 return false;
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73 }
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74 }