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annotate jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/LineNumberTable.java @ 23700:9e1235406b59

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[Findbugs] various warnings reported for JVMCI sources (JDK-8159613)
author Doug Simon <doug.simon@oracle.com>
date Sat, 18 Jun 2016 13:19:01 +0200
parents 1d4ce2d19e52
children 0bd91cd9869d
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1 /*
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2 * Copyright (c) 2011, 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.meta;
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24
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25 /**
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26 * Maps bytecode indexes to source line numbers.
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27 *
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28 * @see "https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.12"
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29 */
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30 public class LineNumberTable {
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31
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32 private final int[] lineNumbers;
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33 private final int[] bci;
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34
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35 /**
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36 *
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37 * @param lineNumbers an array or source line numbers. This array is now owned by this object
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38 * and should not be mutated by the caller.
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39 * @param bci an array of bytecode indexes the same length at {@code lineNumbers} whose entries
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40 * are sorted in ascending order. This array is now owned by this object and must not
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41 * be mutated by the caller.
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42 */
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43 @SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "caller transfers ownership of `lineNumbers` and `bcis`")
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44 public LineNumberTable(int[] lineNumbers, int[] bci) {
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45 assert bci.length == lineNumbers.length;
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46 this.lineNumbers = lineNumbers;
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47 this.bci = bci;
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48 }
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49
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50 /**
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51 * Gets a source line number for {@code atBci}.
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52 */
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53 public int getLineNumber(int atBci) {
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54 for (int i = 0; i < this.bci.length - 1; i++) {
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55 if (this.bci[i] <= atBci && atBci < this.bci[i + 1]) {
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56 return lineNumbers[i];
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57 }
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58 }
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59 return lineNumbers[lineNumbers.length - 1];
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60 }
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61 }